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Add ShadowTLS protocol v3

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世界 2023-02-18 14:55:47 +08:00 committed by GitHub
parent 1610bdc5dd
commit 21cb227bc2
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GPG key ID: 4AEE18F83AFDEB23
53 changed files with 23127 additions and 229 deletions
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2
.golangci.yml
View file

@ -12,6 +12,8 @@ run:
- transport/simple-obfs
- transport/clashssr
- transport/cloudflaretls
- transport/shadowtls/tls
- transport/shadowtls/tls_go119
linters-settings:
gci:

7
common/tls/config.go
View file

@ -10,8 +10,9 @@ import (
)
type (
STDConfig = tls.Config
STDConn = tls.Conn
STDConfig = tls.Config
STDConn = tls.Conn
ConnectionState = tls.ConnectionState
)
type Config interface {
@ -33,7 +34,7 @@ type ServerConfig interface {
type Conn interface {
net.Conn
HandshakeContext(ctx context.Context) error
ConnectionState() tls.ConnectionState
ConnectionState() ConnectionState
}
func ParseTLSVersion(version string) (uint16, error) {

5
docs/configuration/outbound/shadowtls.md
View file

@ -7,7 +7,7 @@
"server": "127.0.0.1",
"server_port": 1080,
"version": 2,
"version": 3,
"password": "fuck me till the daylight",
"tls": {},
@ -37,12 +37,13 @@ ShadowTLS protocol version.
|---------------|-----------------------------------------------------------------------------------------|
| `1` (default) | [ShadowTLS v1](https://github.com/ihciah/shadow-tls/blob/master/docs/protocol-en.md#v1) |
| `2` | [ShadowTLS v2](https://github.com/ihciah/shadow-tls/blob/master/docs/protocol-en.md#v2) |
| `3` | [ShadowTLS v3](https://github.com/ihciah/shadow-tls/blob/master/docs/protocol-v3-en.md) |
#### password
Set password.
Only available in the ShadowTLS v2 protocol.
Only available in the ShadowTLS v2/v3 protocol.
#### tls

5
docs/configuration/outbound/shadowtls.zh.md
View file

@ -7,7 +7,7 @@
"server": "127.0.0.1",
"server_port": 1080,
"version": 2,
"version": 3,
"password": "fuck me till the daylight",
"tls": {},
@ -37,12 +37,13 @@ ShadowTLS 协议版本。
|---------------|-----------------------------------------------------------------------------------------|
| `1` (default) | [ShadowTLS v1](https://github.com/ihciah/shadow-tls/blob/master/docs/protocol-en.md#v1) |
| `2` | [ShadowTLS v2](https://github.com/ihciah/shadow-tls/blob/master/docs/protocol-en.md#v2) |
| `3` | [ShadowTLS v3](https://github.com/ihciah/shadow-tls/blob/master/docs/protocol-v3-en.md) |
#### password
设置密码。
仅在 ShadowTLS v2 协议中可用。
仅在 ShadowTLS v2/v3 协议中可用。
#### tls

104
inbound/shadowtls.go
View file

@ -3,7 +3,10 @@ package inbound
import (
"bytes"
"context"
"crypto/hmac"
"crypto/sha1"
"encoding/binary"
"encoding/hex"
"io"
"net"
"os"
@ -27,7 +30,7 @@ type ShadowTLS struct {
myInboundAdapter
handshakeDialer N.Dialer
handshakeAddr M.Socksaddr
v2 bool
version int
password string
fallbackAfter int
}
@ -47,17 +50,18 @@ func NewShadowTLS(ctx context.Context, router adapter.Router, logger log.Context
handshakeAddr: options.Handshake.ServerOptions.Build(),
password: options.Password,
}
inbound.version = options.Version
switch options.Version {
case 0:
fallthrough
case 1:
case 2:
inbound.v2 = true
if options.FallbackAfter == nil {
inbound.fallbackAfter = 2
} else {
inbound.fallbackAfter = *options.FallbackAfter
}
case 3:
default:
return nil, E.New("unknown shadowtls protocol version: ", options.Version)
}
@ -70,7 +74,8 @@ func (s *ShadowTLS) NewConnection(ctx context.Context, conn net.Conn, metadata a
if err != nil {
return err
}
if !s.v2 {
switch s.version {
case 1:
var handshake task.Group
handshake.Append("client handshake", func(ctx context.Context) error {
return s.copyUntilHandshakeFinished(handshakeConn, conn)
@ -87,7 +92,7 @@ func (s *ShadowTLS) NewConnection(ctx context.Context, conn net.Conn, metadata a
return err
}
return s.newConnection(ctx, conn, metadata)
} else {
case 2:
hashConn := shadowtls.NewHashWriteConn(conn, s.password)
go bufio.Copy(hashConn, handshakeConn)
var request *buf.Buffer
@ -102,6 +107,97 @@ func (s *ShadowTLS) NewConnection(ctx context.Context, conn net.Conn, metadata a
} else {
return err
}
default:
fallthrough
case 3:
var clientHelloFrame *buf.Buffer
clientHelloFrame, err = shadowtls.ExtractFrame(conn)
if err != nil {
return E.Cause(err, "read client handshake")
}
_, err = handshakeConn.Write(clientHelloFrame.Bytes())
if err != nil {
clientHelloFrame.Release()
return E.Cause(err, "write client handshake")
}
err = shadowtls.VerifyClientHello(clientHelloFrame.Bytes(), s.password)
if err != nil {
s.logger.WarnContext(ctx, E.Cause(err, "client hello verify failed"))
return bufio.CopyConn(ctx, conn, handshakeConn)
}
s.logger.TraceContext(ctx, "client hello verify success")
clientHelloFrame.Release()
var serverHelloFrame *buf.Buffer
serverHelloFrame, err = shadowtls.ExtractFrame(handshakeConn)
if err != nil {
return E.Cause(err, "read server handshake")
}
_, err = conn.Write(serverHelloFrame.Bytes())
if err != nil {
serverHelloFrame.Release()
return E.Cause(err, "write server handshake")
}
serverRandom := shadowtls.ExtractServerRandom(serverHelloFrame.Bytes())
if serverRandom == nil {
s.logger.WarnContext(ctx, "server random extract failed, will copy bidirectional")
return bufio.CopyConn(ctx, conn, handshakeConn)
}
if !shadowtls.IsServerHelloSupportTLS13(serverHelloFrame.Bytes()) {
s.logger.WarnContext(ctx, "TLS 1.3 is not supported, will copy bidirectional")
return bufio.CopyConn(ctx, conn, handshakeConn)
}
serverHelloFrame.Release()
s.logger.TraceContext(ctx, "client authenticated. server random extracted: ", hex.EncodeToString(serverRandom))
hmacWrite := hmac.New(sha1.New, []byte(s.password))
hmacWrite.Write(serverRandom)
hmacAdd := hmac.New(sha1.New, []byte(s.password))
hmacAdd.Write(serverRandom)
hmacAdd.Write([]byte("S"))
hmacVerify := hmac.New(sha1.New, []byte(s.password))
hmacVerifyReset := func() {
hmacVerify.Reset()
hmacVerify.Write(serverRandom)
hmacVerify.Write([]byte("C"))
}
var clientFirstFrame *buf.Buffer
var group task.Group
var handshakeFinished bool
group.Append("client handshake relay", func(ctx context.Context) error {
clientFrame, cErr := shadowtls.CopyByFrameUntilHMACMatches(conn, handshakeConn, hmacVerify, hmacVerifyReset)
if cErr == nil {
clientFirstFrame = clientFrame
handshakeFinished = true
handshakeConn.Close()
}
return cErr
})
group.Append("server handshake relay", func(ctx context.Context) error {
cErr := shadowtls.CopyByFrameWithModification(handshakeConn, conn, s.password, serverRandom, hmacWrite)
if E.IsClosedOrCanceled(cErr) && handshakeFinished {
return nil
}
return cErr
})
group.Cleanup(func() {
handshakeConn.Close()
})
err = group.Run(ctx)
if err != nil {
return E.Cause(err, "handshake relay")
}
s.logger.TraceContext(ctx, "handshake relay finished")
return s.newConnection(ctx, bufio.NewCachedConn(shadowtls.NewVerifiedConn(conn, hmacAdd, hmacVerify, nil), clientFirstFrame), metadata)
}
}

42
outbound/shadowtls.go
View file

@ -2,6 +2,8 @@ package outbound
import (
"context"
"crypto/hmac"
"crypto/sha1"
"net"
"os"
@ -25,7 +27,7 @@ type ShadowTLS struct {
dialer N.Dialer
serverAddr M.Socksaddr
tlsConfig tls.Config
v2 bool
version int
password string
}
@ -45,6 +47,7 @@ func NewShadowTLS(ctx context.Context, router adapter.Router, logger log.Context
if options.TLS == nil || !options.TLS.Enabled {
return nil, C.ErrTLSRequired
}
outbound.version = options.Version
switch options.Version {
case 0:
fallthrough
@ -52,12 +55,18 @@ func NewShadowTLS(ctx context.Context, router adapter.Router, logger log.Context
options.TLS.MinVersion = "1.2"
options.TLS.MaxVersion = "1.2"
case 2:
outbound.v2 = true
case 3:
options.TLS.MinVersion = "1.3"
options.TLS.MaxVersion = "1.3"
default:
return nil, E.New("unknown shadowtls protocol version: ", options.Version)
}
var err error
outbound.tlsConfig, err = tls.NewClient(router, options.Server, common.PtrValueOrDefault(options.TLS))
if options.Version != 3 {
outbound.tlsConfig, err = tls.NewClient(router, options.Server, common.PtrValueOrDefault(options.TLS))
} else {
outbound.tlsConfig, err = shadowtls.NewClientTLSConfig(options.Server, common.PtrValueOrDefault(options.TLS), options.Password)
}
if err != nil {
return nil, err
}
@ -74,19 +83,42 @@ func (s *ShadowTLS) DialContext(ctx context.Context, network string, destination
if err != nil {
return nil, err
}
if !s.v2 {
switch s.version {
default:
fallthrough
case 1:
_, err = tls.ClientHandshake(ctx, conn, s.tlsConfig)
if err != nil {
return nil, err
}
return conn, nil
} else {
case 2:
hashConn := shadowtls.NewHashReadConn(conn, s.password)
_, err = tls.ClientHandshake(ctx, hashConn, s.tlsConfig)
if err != nil {
return nil, err
}
return shadowtls.NewClientConn(hashConn), nil
case 3:
streamWrapper := shadowtls.NewStreamWrapper(conn, s.password)
_, err = tls.ClientHandshake(ctx, streamWrapper, s.tlsConfig)
if err != nil {
return nil, err
}
authorized, serverRandom, readHMAC := streamWrapper.Authorized()
if !authorized {
return nil, E.New("traffic hijacked or TLS1.3 is not supported")
}
hmacAdd := hmac.New(sha1.New, []byte(s.password))
hmacAdd.Write(serverRandom)
hmacAdd.Write([]byte("C"))
hmacVerify := hmac.New(sha1.New, []byte(s.password))
hmacVerify.Write(serverRandom)
hmacVerify.Write([]byte("S"))
return shadowtls.NewVerifiedConn(conn, hmacAdd, hmacVerify, readHMAC), nil
}
}

61
test/go.mod
View file

@ -9,81 +9,88 @@ replace github.com/sagernet/sing-box => ../
require (
github.com/docker/docker v20.10.18+incompatible
github.com/docker/go-connections v0.4.0
github.com/gofrs/uuid v4.3.1+incompatible
github.com/sagernet/sing v0.0.0-20221008120626-60a9910eefe4
github.com/sagernet/sing-shadowsocks v0.0.0-20220819002358-7461bb09a8f6
github.com/gofrs/uuid v4.4.0+incompatible
github.com/sagernet/sing v0.1.7-0.20230209132010-5f1ef3441c13
github.com/sagernet/sing-shadowsocks v0.1.1-0.20230202035033-e3123545f2f7
github.com/spyzhov/ajson v0.7.1
github.com/stretchr/testify v1.8.1
go.uber.org/goleak v1.2.0
golang.org/x/net v0.2.0
golang.org/x/net v0.7.0
)
require (
berty.tech/go-libtor v1.0.385 // indirect
github.com/Dreamacro/clash v1.11.12 // indirect
github.com/Dreamacro/clash v1.13.0 // indirect
github.com/Microsoft/go-winio v0.5.1 // indirect
github.com/ajg/form v1.5.1 // indirect
github.com/andybalholm/brotli v1.0.4 // indirect
github.com/caddyserver/certmagic v0.17.2 // indirect
github.com/cloudflare/circl v1.2.1-0.20221019164342-6ab4dfed8f3c // indirect
github.com/cretz/bine v0.2.0 // indirect
github.com/database64128/tfo-go/v2 v2.0.2 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/docker/distribution v2.8.1+incompatible // indirect
github.com/docker/go-units v0.4.0 // indirect
github.com/fsnotify/fsnotify v1.6.0 // indirect
github.com/go-chi/chi/v5 v5.0.7 // indirect
github.com/go-chi/chi/v5 v5.0.8 // indirect
github.com/go-chi/cors v1.2.1 // indirect
github.com/go-chi/render v1.0.2 // indirect
github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 // indirect
github.com/gogo/protobuf v1.3.2 // indirect
github.com/golang/mock v1.6.0 // indirect
github.com/golang/protobuf v1.5.2 // indirect
github.com/google/btree v1.0.1 // indirect
github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
github.com/hashicorp/yamux v0.1.1 // indirect
github.com/klauspost/compress v1.15.12 // indirect
github.com/insomniacslk/dhcp v0.0.0-20221215072855-de60144f33f8 // indirect
github.com/josharian/native v1.1.0 // indirect
github.com/klauspost/compress v1.15.15 // indirect
github.com/klauspost/cpuid/v2 v2.1.1 // indirect
github.com/libdns/libdns v0.2.1 // indirect
github.com/logrusorgru/aurora v2.0.3+incompatible // indirect
github.com/marten-seemann/qpack v0.3.0 // indirect
github.com/marten-seemann/qtls-go1-18 v0.1.3 // indirect
github.com/marten-seemann/qtls-go1-19 v0.1.1 // indirect
github.com/mholt/acmez v1.0.4 // indirect
github.com/mholt/acmez v1.1.0 // indirect
github.com/miekg/dns v1.1.50 // indirect
github.com/moby/term v0.0.0-20221105221325-4eb28fa6025c // indirect
github.com/morikuni/aec v1.0.0 // indirect
github.com/onsi/ginkgo/v2 v2.2.0 // indirect
github.com/opencontainers/go-digest v1.0.0 // indirect
github.com/opencontainers/image-spec v1.0.2 // indirect
github.com/oschwald/maxminddb-golang v1.10.0 // indirect
github.com/pires/go-proxyproto v0.6.2 // indirect
github.com/pkg/errors v0.9.1 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/refraction-networking/utls v1.2.0 // indirect
github.com/sagernet/abx-go v0.0.0-20220819185957-dba1257d738e // indirect
github.com/quic-go/qpack v0.4.0 // indirect
github.com/quic-go/qtls-go1-18 v0.2.0 // indirect
github.com/quic-go/qtls-go1-19 v0.2.0 // indirect
github.com/quic-go/qtls-go1-20 v0.1.0 // indirect
github.com/refraction-networking/utls v1.2.2 // indirect
github.com/sagernet/cloudflare-tls v0.0.0-20221031050923-d70792f4c3a0 // indirect
github.com/sagernet/go-tun2socks v1.16.12-0.20220818015926-16cb67876a61 // indirect
github.com/sagernet/netlink v0.0.0-20220905062125-8043b4a9aa97 // indirect
github.com/sagernet/quic-go v0.0.0-20221108053023-645bcc4f9b15 // indirect
github.com/sagernet/sing-dns v0.0.0-20221113031420-c6aaf2ea4b10 // indirect
github.com/sagernet/sing-tun v0.0.0-20221104121441-66c48a57776f // indirect
github.com/sagernet/sing-vmess v0.0.0-20221109021549-b446d5bdddf0 // indirect
github.com/sagernet/quic-go v0.0.0-20230202071646-a8c8afb18b32 // indirect
github.com/sagernet/sing-dns v0.1.2-0.20230209132355-3c2e2957b455 // indirect
github.com/sagernet/sing-tun v0.1.1 // indirect
github.com/sagernet/sing-vmess v0.1.1-0.20230212211128-cb4e47dd0acb // indirect
github.com/sagernet/smux v0.0.0-20220831015742-e0f1988e3195 // indirect
github.com/sagernet/tfo-go v0.0.0-20230207095944-549363a7327d // indirect
github.com/sagernet/websocket v0.0.0-20220913015213-615516348b4e // indirect
github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c // indirect
github.com/sirupsen/logrus v1.9.0 // indirect
github.com/u-root/uio v0.0.0-20221213070652-c3537552635f // indirect
github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 // indirect
go.etcd.io/bbolt v1.3.6 // indirect
go.etcd.io/bbolt v1.3.7 // indirect
go.uber.org/atomic v1.10.0 // indirect
go.uber.org/multierr v1.6.0 // indirect
go.uber.org/zap v1.23.0 // indirect
go4.org/netipx v0.0.0-20220925034521-797b0c90d8ab // indirect
golang.org/x/crypto v0.3.0 // indirect
golang.org/x/exp v0.0.0-20221028150844-83b7d23a625f // indirect
go.uber.org/zap v1.24.0 // indirect
go4.org/netipx v0.0.0-20230125063823-8449b0a6169f // indirect
golang.org/x/crypto v0.6.0 // indirect
golang.org/x/exp v0.0.0-20230213192124-5e25df0256eb // indirect
golang.org/x/mod v0.6.0 // indirect
golang.org/x/sys v0.2.0 // indirect
golang.org/x/text v0.4.0 // indirect
golang.org/x/sys v0.5.0 // indirect
golang.org/x/text v0.7.0 // indirect
golang.org/x/time v0.0.0-20191024005414-555d28b269f0 // indirect
golang.org/x/tools v0.2.0 // indirect
google.golang.org/genproto v0.0.0-20210722135532-667f2b7c528f // indirect
google.golang.org/grpc v1.51.0 // indirect
google.golang.org/genproto v0.0.0-20230110181048-76db0878b65f // indirect
google.golang.org/grpc v1.53.0 // indirect
google.golang.org/protobuf v1.28.1 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
gotest.tools/v3 v3.4.0 // indirect

279
test/go.sum
View file

@ -1,34 +1,25 @@
berty.tech/go-libtor v1.0.385 h1:RWK94C3hZj6Z2GdvePpHJLnWYobFr3bY/OdUJ5aoEXw=
berty.tech/go-libtor v1.0.385/go.mod h1:9swOOQVb+kmvuAlsgWUK/4c52pm69AdbJsxLzk+fJEw=
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/Dreamacro/clash v1.11.12 h1:zJ+FUWPHWxhfNl5MK64oezFAPPyGth+SDhjuWEJ/jwM=
github.com/Dreamacro/clash v1.11.12/go.mod h1:WiRGFHBrOUYP89GXJ9k4KCyZq5i485LWzc4FPsEPlMI=
github.com/Dreamacro/clash v1.13.0 h1:gF0E0TluE1LCmuhhg0/bjqABYDmSnXkUjXjRhZxyrm8=
github.com/Dreamacro/clash v1.13.0/go.mod h1:hf0RkWPsQ0e8oS8WVJBIRocY/1ILYzQQg9zeMwd8LsM=
github.com/Microsoft/go-winio v0.5.1 h1:aPJp2QD7OOrhO5tQXqQoGSJc+DjDtWTGLOmNyAm6FgY=
github.com/Microsoft/go-winio v0.5.1/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84=
github.com/ajg/form v1.5.1 h1:t9c7v8JUKu/XxOGBU0yjNpaMloxGEJhUkqFRq0ibGeU=
github.com/ajg/form v1.5.1/go.mod h1:uL1WgH+h2mgNtvBq0339dVnzXdBETtL2LeUXaIv25UY=
github.com/andybalholm/brotli v1.0.4 h1:V7DdXeJtZscaqfNuAdSRuRFzuiKlHSC/Zh3zl9qY3JY=
github.com/andybalholm/brotli v1.0.4/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
github.com/caddyserver/certmagic v0.17.2 h1:o30seC1T/dBqBCNNGNHWwj2i5/I/FMjBbTAhjADP3nE=
github.com/caddyserver/certmagic v0.17.2/go.mod h1:ouWUuC490GOLJzkyN35eXfV8bSbwMwSf4bdhkIxtdQE=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/cloudflare/circl v1.2.1-0.20221019164342-6ab4dfed8f3c h1:K1VdSnBZiGapczwcUKnE1qcsMBclA84DUOD2NG/78VY=
github.com/cloudflare/circl v1.2.1-0.20221019164342-6ab4dfed8f3c/go.mod h1:+CauBF6R70Jqcyl8N2hC8pAXYbWkGIezuSbuGLtRhnw=
github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
github.com/cretz/bine v0.1.0/go.mod h1:6PF6fWAvYtwjRGkAuDEJeWNOv3a2hUouSP/yRYXmvHw=
github.com/cretz/bine v0.2.0 h1:8GiDRGlTgz+o8H9DSnsl+5MeBK4HsExxgl6WgzOCuZo=
github.com/cretz/bine v0.2.0/go.mod h1:WU4o9QR9wWp8AVKtTM1XD5vUHkEqnf2vVSo6dBqbetI=
github.com/database64128/tfo-go/v2 v2.0.2 h1:5rGgkJeLEKlNaqredfrPQNLnctn1b+1fq/8tdKdOzJg=
github.com/database64128/tfo-go/v2 v2.0.2/go.mod h1:FDdt4JaAsRU66wsYHxSVytYimPkKIHupVsxM+5DhvjY=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@ -40,39 +31,23 @@ github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKoh
github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec=
github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=
github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.mod h1:hliV/p42l8fGbc6Y9bQ70uLwIvmJyVE5k4iMKlh8wCQ=
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
github.com/fanliao/go-promise v0.0.0-20141029170127-1890db352a72/go.mod h1:PjfxuH4FZdUyfMdtBio2lsRr1AKEaVPwelzuHuh8Lqc=
github.com/fsnotify/fsnotify v1.6.0 h1:n+5WquG0fcWoWp6xPWfHdbskMCQaFnG6PfBrh1Ky4HY=
github.com/fsnotify/fsnotify v1.6.0/go.mod h1:sl3t1tCWJFWoRz9R8WJCbQihKKwmorjAbSClcnxKAGw=
github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
github.com/go-chi/chi/v5 v5.0.7 h1:rDTPXLDHGATaeHvVlLcR4Qe0zftYethFucbjVQ1PxU8=
github.com/go-chi/chi/v5 v5.0.7/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
github.com/go-chi/chi/v5 v5.0.8 h1:lD+NLqFcAi1ovnVZpsnObHGW4xb4J8lNmoYVfECH1Y0=
github.com/go-chi/chi/v5 v5.0.8/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=
github.com/go-chi/cors v1.2.1 h1:xEC8UT3Rlp2QuWNEr4Fs/c2EAGVKBwy/1vHx3bppil4=
github.com/go-chi/cors v1.2.1/go.mod h1:sSbTewc+6wYHBBCW7ytsFSn836hqM7JxpglAy2Vzc58=
github.com/go-chi/render v1.0.2 h1:4ER/udB0+fMWB2Jlf15RV3F4A2FDuYi/9f+lFttR/Lg=
github.com/go-chi/render v1.0.2/go.mod h1:/gr3hVkmYR0YlEy3LxCuVRFzEu9Ruok+gFqbIofjao0=
github.com/gofrs/uuid v4.3.1+incompatible h1:0/KbAdpx3UXAx1kEOWHJeOkpbgRFGHVgv+CFIY7dBJI=
github.com/gofrs/uuid v4.3.1+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I=
github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
github.com/gofrs/uuid v4.4.0+incompatible h1:3qXRTX8/NbyulANqlc0lchS1gqAVxRgsuW1YrTJupqA=
github.com/gofrs/uuid v4.4.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.6.0 h1:ErTB+efbowRARo13NNdxyJji2egdxLGQhRaY+DUumQc=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
github.com/golang/mock v1.6.0/go.mod h1:p6yTPP+5HYm5mzsMV8JkE6ZKdX+/wYM6Hr+LicevLPs=
github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
@ -82,45 +57,57 @@ github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5a
github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 h1:yAJXTCF9TqKcTiHJAE8dj7HMvPfh66eeA2JYW7eFpSE=
github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
github.com/hashicorp/yamux v0.1.1 h1:yrQxtgseBDrq9Y652vSRDvsKCJKOUD+GzTS4Y0Y8pvE=
github.com/hashicorp/yamux v0.1.1/go.mod h1:CtWFDAQgb7dxtzFs4tWbplKIe2jSi3+5vKbgIO0SLnQ=
github.com/hugelgupf/socketpair v0.0.0-20190730060125-05d35a94e714/go.mod h1:2Goc3h8EklBH5mspfHFxBnEoURQCGzQQH1ga9Myjvis=
github.com/ianlancetaylor/demangle v0.0.0-20200824232613-28f6c0f3b639/go.mod h1:aSSvb/t6k1mPoxDqO4vJh6VOCGPwU4O0C2/Eqndh1Sc=
github.com/insomniacslk/dhcp v0.0.0-20221215072855-de60144f33f8 h1:Z72DOke2yOK0Ms4Z2LK1E1OrRJXOxSj5DllTz2FYTRg=
github.com/insomniacslk/dhcp v0.0.0-20221215072855-de60144f33f8/go.mod h1:m5WMe03WCvWcXjRnhvaAbAAXdCnu20J5P+mmH44ZzpE=
github.com/josharian/native v1.0.1-0.20221213033349-c1e37c09b531/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
github.com/jsimonetti/rtnetlink v0.0.0-20190606172950-9527aa82566a/go.mod h1:Oz+70psSo5OFh8DBl0Zv2ACw7Esh6pPUphlvZG9x7uw=
github.com/jsimonetti/rtnetlink v0.0.0-20200117123717-f846d4f6c1f4/go.mod h1:WGuG/smIU4J/54PblvSbh+xvCZmpJnFgr3ds6Z55XMQ=
github.com/jsimonetti/rtnetlink v0.0.0-20201009170750-9c6f07d100c1/go.mod h1:hqoO/u39cqLeBLebZ8fWdE96O7FxrAsRYhnVOdgHxok=
github.com/jsimonetti/rtnetlink v0.0.0-20201110080708-d2c240429e6c/go.mod h1:huN4d1phzjhlOsNIjFsw2SVRbwIHj3fJDMEU2SDPTmg=
github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
github.com/klauspost/compress v1.15.12 h1:YClS/PImqYbn+UILDnqxQCZ3RehC9N318SU3kElDUEM=
github.com/klauspost/compress v1.15.12/go.mod h1:QPwzmACJjUTFsnSHH934V6woptycfrDDJnH7hvFVbGM=
github.com/klauspost/compress v1.15.15 h1:EF27CXIuDsYJ6mmvtBRlEuB2UVOqHG1tAXgZ7yIO+lw=
github.com/klauspost/compress v1.15.15/go.mod h1:ZcK2JAFqKOpnBlxcLsJzYfrS9X1akm9fHZNnD9+Vo/4=
github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
github.com/klauspost/cpuid/v2 v2.1.1 h1:t0wUqjowdm8ezddV5k0tLWVklVuvLJpoHeb4WBdydm0=
github.com/klauspost/cpuid/v2 v2.1.1/go.mod h1:RVVoqg1df56z8g3pUjL/3lE5UfnlrJX8tyFgg4nqhuY=
github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
github.com/libdns/libdns v0.2.1 h1:Wu59T7wSHRgtA0cfxC+n1c/e+O3upJGWytknkmFEDis=
github.com/libdns/libdns v0.2.1/go.mod h1:yQCXzk1lEZmmCPa857bnk4TsOiqYasqpyOEeSObbb40=
github.com/logrusorgru/aurora v2.0.3+incompatible h1:tOpm7WcpBTn4fjmVfgpQq0EfczGlG91VSDkswnjF5A8=
github.com/logrusorgru/aurora v2.0.3+incompatible/go.mod h1:7rIyQOR62GCctdiQpZ/zOJlFyk6y+94wXzv6RNZgaR4=
github.com/marten-seemann/qpack v0.3.0 h1:UiWstOgT8+znlkDPOg2+3rIuYXJ2CnGDkGUXN6ki6hE=
github.com/marten-seemann/qpack v0.3.0/go.mod h1:cGfKPBiP4a9EQdxCwEwI/GEeWAsjSekBvx/X8mh58+g=
github.com/marten-seemann/qtls-go1-18 v0.1.3 h1:R4H2Ks8P6pAtUagjFty2p7BVHn3XiwDAl7TTQf5h7TI=
github.com/marten-seemann/qtls-go1-18 v0.1.3/go.mod h1:mJttiymBAByA49mhlNZZGrH5u1uXYZJ+RW28Py7f4m4=
github.com/marten-seemann/qtls-go1-19 v0.1.1 h1:mnbxeq3oEyQxQXwI4ReCgW9DPoPR94sNlqWoDZnjRIE=
github.com/marten-seemann/qtls-go1-19 v0.1.1/go.mod h1:5HTDWtVudo/WFsHKRNuOhWlbdjrfs5JHrYb0wIJqGpI=
github.com/mholt/acmez v1.0.4 h1:N3cE4Pek+dSolbsofIkAYz6H1d3pE+2G0os7QHslf80=
github.com/mholt/acmez v1.0.4/go.mod h1:qFGLZ4u+ehWINeJZjzPlsnjJBCPAADWTcIqE/7DAYQY=
github.com/mdlayher/ethernet v0.0.0-20190606142754-0394541c37b7/go.mod h1:U6ZQobyTjI/tJyq2HG+i/dfSoFUt8/aZCM+GKtmFk/Y=
github.com/mdlayher/netlink v0.0.0-20190409211403-11939a169225/go.mod h1:eQB3mZE4aiYnlUsyGGCOpPETfdQq4Jhsgf1fk3cwQaA=
github.com/mdlayher/netlink v1.0.0/go.mod h1:KxeJAFOFLG6AjpyDkQ/iIhxygIUKD+vcwqcnu43w/+M=
github.com/mdlayher/netlink v1.1.0/go.mod h1:H4WCitaheIsdF9yOYu8CFmCgQthAPIWZmcKp9uZHgmY=
github.com/mdlayher/netlink v1.1.1/go.mod h1:WTYpFb/WTvlRJAyKhZL5/uy69TDDpHHu2VZmb2XgV7o=
github.com/mdlayher/raw v0.0.0-20190606142536-fef19f00fc18/go.mod h1:7EpbotpCmVZcu+KCX4g9WaRNuu11uyhiW7+Le1dKawg=
github.com/mdlayher/raw v0.0.0-20191009151244-50f2db8cc065/go.mod h1:7EpbotpCmVZcu+KCX4g9WaRNuu11uyhiW7+Le1dKawg=
github.com/mholt/acmez v1.1.0 h1:IQ9CGHKOHokorxnffsqDvmmE30mDenO1lptYZ1AYkHY=
github.com/mholt/acmez v1.1.0/go.mod h1:zwo5+fbLLTowAX8o8ETfQzbDtwGEXnPhkmGdKIP+bgs=
github.com/miekg/dns v1.1.50 h1:DQUfb9uc6smULcREF09Uc+/Gd46YWqJd5DbpPE9xkcA=
github.com/miekg/dns v1.1.50/go.mod h1:e3IlAVfNqAllflbibAZEWOXOQ+Ynzk/dDozDxY7XnME=
github.com/moby/term v0.0.0-20221105221325-4eb28fa6025c h1:RC8WMpjonrBfyAh6VN/POIPtYD5tRAq0qMqCRjQNK+g=
github.com/moby/term v0.0.0-20221105221325-4eb28fa6025c/go.mod h1:9OcmHNQQUTbk4XCffrLgN1NEKc2mh5u++biHVrvHsSU=
github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
github.com/onsi/ginkgo/v2 v2.3.0 h1:kUMoxMoQG3ogk/QWyKh3zibV7BKZ+xBpWil1cTylVqc=
github.com/onsi/gomega v1.22.1 h1:pY8O4lBfsHKZHM/6nrxkhVPUznOlIu3quZcKP/M20KI=
github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e h1:fD57ERR4JtEqsWbfPhv4DMiApHyliiK5xCTNVSPiaAs=
github.com/onsi/ginkgo/v2 v2.2.0 h1:3ZNA3L1c5FYDFTTxbFeVGGD8jYvjYauHD30YgLxVsNI=
github.com/onsi/ginkgo/v2 v2.2.0/go.mod h1:MEH45j8TBi6u9BMogfbp0stKC5cdGjumZj5Y7AG4VIk=
github.com/onsi/gomega v1.20.1 h1:PA/3qinGoukvymdIDV8pii6tiZgC8kbmJO6Z5+b002Q=
github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U=
github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM=
github.com/opencontainers/image-spec v1.0.2 h1:9yCKha/T5XdGtO0q9Q9a6T5NUCsTn/DrBg0D7ufOcFM=
@ -129,39 +116,44 @@ github.com/oschwald/maxminddb-golang v1.10.0 h1:Xp1u0ZhqkSuopaKmk1WwHtjF0H9Hd918
github.com/oschwald/maxminddb-golang v1.10.0/go.mod h1:Y2ELenReaLAZ0b400URyGwvYxHV1dLIxBuyOsyYjHK0=
github.com/pires/go-proxyproto v0.6.2 h1:KAZ7UteSOt6urjme6ZldyFm4wDe/z0ZUP0Yv0Dos0d8=
github.com/pires/go-proxyproto v0.6.2/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
github.com/refraction-networking/utls v1.2.0 h1:U5f8wkij2NVinfLuJdFP3gCMwIHs+EzvhxmYdXgiapo=
github.com/refraction-networking/utls v1.2.0/go.mod h1:NPq+cVqzH7D1BeOkmOcb5O/8iVewAsiVt2x1/eO0hgQ=
github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
github.com/sagernet/abx-go v0.0.0-20220819185957-dba1257d738e h1:5CFRo8FJbCuf5s/eTBdZpmMbn8Fe2eSMLNAYfKanA34=
github.com/sagernet/abx-go v0.0.0-20220819185957-dba1257d738e/go.mod h1:qbt0dWObotCfcjAJJ9AxtFPNSDUfZF+6dCpgKEOBn/g=
github.com/quic-go/qpack v0.4.0 h1:Cr9BXA1sQS2SmDUWjSofMPNKmvF6IiIfDRmgU0w1ZCo=
github.com/quic-go/qpack v0.4.0/go.mod h1:UZVnYIfi5GRk+zI9UMaCPsmZ2xKJP7XBUvVyT1Knj9A=
github.com/quic-go/qtls-go1-18 v0.2.0 h1:5ViXqBZ90wpUcZS0ge79rf029yx0dYB0McyPJwqqj7U=
github.com/quic-go/qtls-go1-18 v0.2.0/go.mod h1:moGulGHK7o6O8lSPSZNoOwcLvJKJ85vVNc7oJFD65bc=
github.com/quic-go/qtls-go1-19 v0.2.0 h1:Cvn2WdhyViFUHoOqK52i51k4nDX8EwIh5VJiVM4nttk=
github.com/quic-go/qtls-go1-19 v0.2.0/go.mod h1:ySOI96ew8lnoKPtSqx2BlI5wCpUVPT05RMAlajtnyOI=
github.com/quic-go/qtls-go1-20 v0.1.0 h1:d1PK3ErFy9t7zxKsG3NXBJXZjp/kMLoIb3y/kV54oAI=
github.com/quic-go/qtls-go1-20 v0.1.0/go.mod h1:JKtK6mjbAVcUTN/9jZpvLbGxvdWIKS8uT7EiStoU1SM=
github.com/refraction-networking/utls v1.2.2 h1:uBE6V173CwG8MQrSBpNZHAix1fxOvuLKYyjFAu3uqo0=
github.com/refraction-networking/utls v1.2.2/go.mod h1:L1goe44KvhnTfctUffM2isnJpSjPlYShrhXDeZaoYKw=
github.com/sagernet/cloudflare-tls v0.0.0-20221031050923-d70792f4c3a0 h1:KyhtFFt1Jtp5vW2ohNvstvQffTOQ/s5vENuGXzdA+TM=
github.com/sagernet/cloudflare-tls v0.0.0-20221031050923-d70792f4c3a0/go.mod h1:D4SFEOkJK+4W1v86ZhX0jPM0rAL498fyQAChqMtes/I=
github.com/sagernet/go-tun2socks v1.16.12-0.20220818015926-16cb67876a61 h1:5+m7c6AkmAylhauulqN/c5dnh8/KssrE9c93TQrXldA=
github.com/sagernet/go-tun2socks v1.16.12-0.20220818015926-16cb67876a61/go.mod h1:QUQ4RRHD6hGGHdFMEtR8T2P6GS6R3D/CXKdaYHKKXms=
github.com/sagernet/netlink v0.0.0-20220905062125-8043b4a9aa97 h1:iL5gZI3uFp0X6EslacyapiRz7LLSJyr4RajF/BhMVyE=
github.com/sagernet/netlink v0.0.0-20220905062125-8043b4a9aa97/go.mod h1:xLnfdiJbSp8rNqYEdIW/6eDO4mVoogml14Bh2hSiFpM=
github.com/sagernet/quic-go v0.0.0-20221108053023-645bcc4f9b15 h1:l8RQTjz5LlGEFOc49dXAr14ORbj8mTW7nX88Rbm+FiY=
github.com/sagernet/quic-go v0.0.0-20221108053023-645bcc4f9b15/go.mod h1:oWFbojDMm85/Jbm/fyWoo8Pux6dIssxGi3q1r+5642A=
github.com/sagernet/quic-go v0.0.0-20230202071646-a8c8afb18b32 h1:tztuJB+giOWNRKQEBVY2oI3PsheTooMdh+/yxemYQYY=
github.com/sagernet/quic-go v0.0.0-20230202071646-a8c8afb18b32/go.mod h1:QMCkxXAC3CvBgDZVIJp43NWTuwGBScCzMLVLynjERL8=
github.com/sagernet/sing v0.0.0-20220812082120-05f9836bff8f/go.mod h1:QVsS5L/ZA2Q5UhQwLrn0Trw+msNd/NPGEhBKR/ioWiY=
github.com/sagernet/sing v0.0.0-20220817130738-ce854cda8522/go.mod h1:QVsS5L/ZA2Q5UhQwLrn0Trw+msNd/NPGEhBKR/ioWiY=
github.com/sagernet/sing v0.0.0-20221008120626-60a9910eefe4 h1:LO7xMvMGhYmjQg2vjhTzsODyzs9/WLYu5Per+/8jIeo=
github.com/sagernet/sing v0.0.0-20221008120626-60a9910eefe4/go.mod h1:zvgDYKI+vCAW9RyfyrKTgleI+DOa8lzHMPC7VZo3OL4=
github.com/sagernet/sing-dns v0.0.0-20221113031420-c6aaf2ea4b10 h1:K84AY2TxNX37ePYXVO6QTD/kgn9kDo4oGpTIn9PF5bo=
github.com/sagernet/sing-dns v0.0.0-20221113031420-c6aaf2ea4b10/go.mod h1:VAvOT1pyryBIthTGRryFLXAsR1VRQZ05wolMYeQrr/E=
github.com/sagernet/sing-shadowsocks v0.0.0-20220819002358-7461bb09a8f6 h1:JJfDeYYhWunvtxsU/mOVNTmFQmnzGx9dY034qG6G3g4=
github.com/sagernet/sing-shadowsocks v0.0.0-20220819002358-7461bb09a8f6/go.mod h1:EX3RbZvrwAkPI2nuGa78T2iQXmrkT+/VQtskjou42xM=
github.com/sagernet/sing-tun v0.0.0-20221104121441-66c48a57776f h1:CXF+nErOb9f7qiHingSgTa2/lJAgmEFtAQ47oVwdRGU=
github.com/sagernet/sing-tun v0.0.0-20221104121441-66c48a57776f/go.mod h1:1u3pjXA9HmH7kRiBJqM3C/zPxrxnCLd3svmqtub/RFU=
github.com/sagernet/sing-vmess v0.0.0-20221109021549-b446d5bdddf0 h1:z3kuD3hPNdEq7/wVy5lwE21f+8ZTazBtR81qswxJoCc=
github.com/sagernet/sing-vmess v0.0.0-20221109021549-b446d5bdddf0/go.mod h1:bwhAdSNET1X+j9DOXGj9NIQR39xgcWIk1rOQ9lLD+gM=
github.com/sagernet/sing v0.1.7-0.20230209132010-5f1ef3441c13 h1:S/+YvJCEChwnckGhzqSrE/Q2m6aVWhkt1I4Pv2yCMVw=
github.com/sagernet/sing v0.1.7-0.20230209132010-5f1ef3441c13/go.mod h1:jt1w2u7lJQFFSGLiRrRIs5YWmx4kAPfWuOejuDW9qMk=
github.com/sagernet/sing-dns v0.1.2-0.20230209132355-3c2e2957b455 h1:VA/j2Jg+JURgKw2C1Dw2tpjfOZwbLXRy8PJRbJS/HEU=
github.com/sagernet/sing-dns v0.1.2-0.20230209132355-3c2e2957b455/go.mod h1:nonvn66ja+UNrQl3jzJy0EFRn15QUaCFAVXTXf6TgJ4=
github.com/sagernet/sing-shadowsocks v0.1.1-0.20230202035033-e3123545f2f7 h1:Plup6oEiyLzY3HDqQ+QsUBzgBGdVmcsgf3t8h940z9U=
github.com/sagernet/sing-shadowsocks v0.1.1-0.20230202035033-e3123545f2f7/go.mod h1:O5LtOs8Ivw686FqLpO0Zu+A0ROVE15VeqEK3yDRRAms=
github.com/sagernet/sing-tun v0.1.1 h1:2Hg3GAyJWzQ7Ua1j74dE+mI06vaqSBO9yD4tkTjggn4=
github.com/sagernet/sing-tun v0.1.1/go.mod h1:WzW/SkT+Nh9uJn/FIYUE2YJHYuPwfbh8sATOzU9QDGw=
github.com/sagernet/sing-vmess v0.1.1-0.20230212211128-cb4e47dd0acb h1:oyd3w17fXNmWVYFUe17YVHJW5CLW9X2mxJFDP/IWrAM=
github.com/sagernet/sing-vmess v0.1.1-0.20230212211128-cb4e47dd0acb/go.mod h1:9KkmnQzTL4Gvv8U2TRAH2BOITCGsGPpHtUPP5sxn5sY=
github.com/sagernet/smux v0.0.0-20220831015742-e0f1988e3195 h1:5VBIbVw9q7aKbrFdT83mjkyvQ+VaRsQ6yflTepfln38=
github.com/sagernet/smux v0.0.0-20220831015742-e0f1988e3195/go.mod h1:yedWtra8nyGJ+SyI+ziwuaGMzBatbB10P1IOOZbbSK8=
github.com/sagernet/tfo-go v0.0.0-20230207095944-549363a7327d h1:trP/l6ZPWvQ/5Gv99Z7/t/v8iYy06akDMejxW1sznUk=
github.com/sagernet/tfo-go v0.0.0-20230207095944-549363a7327d/go.mod h1:jk6Ii8Y3En+j2KQDLgdgQGwb3M6y7EL567jFnGYhN9g=
github.com/sagernet/websocket v0.0.0-20220913015213-615516348b4e h1:7uw2njHFGE+VpWamge6o56j2RWk4omF6uLKKxMmcWvs=
github.com/sagernet/websocket v0.0.0-20220913015213-615516348b4e/go.mod h1:45TUl8+gH4SIKr4ykREbxKWTxkDlSzFENzctB1dVRRY=
github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c h1:vK2wyt9aWYHHvNLWniwijBu/n4pySypiKRhN32u/JGo=
@ -169,6 +161,8 @@ github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c/go.mod h1:eu
github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=
github.com/sirupsen/logrus v1.9.0/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
github.com/spyzhov/ajson v0.7.1 h1:1MDIlPc6x0zjNtpa7tDzRAyFAvRX+X8ZsvtYz5lZg6A=
github.com/spyzhov/ajson v0.7.1/go.mod h1:63V+CGM6f1Bu/p4nLIN8885ojBdt88TbLoSFzyqMuVA=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@ -177,128 +171,116 @@ github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpE
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk=
github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
github.com/u-root/uio v0.0.0-20221213070652-c3537552635f h1:dpx1PHxYqAnXzbryJrWP1NQLzEjwcVgFLhkknuFQ7ww=
github.com/u-root/uio v0.0.0-20221213070652-c3537552635f/go.mod h1:IogEAUBXDEwX7oR/BMmCctShYs80ql4hF0ySdzGxf7E=
github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 h1:gga7acRE695APm9hlsSMoOoE65U4/TcqNj90mc69Rlg=
github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
go.etcd.io/bbolt v1.3.6 h1:/ecaJf0sk1l4l6V4awd65v2C3ILy7MSj+s/x1ADCIMU=
go.etcd.io/bbolt v1.3.6/go.mod h1:qXsaaIqmgQH0T+OPdb99Bf+PKfBBQVAdyD6TY9G8XM4=
go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
go.etcd.io/bbolt v1.3.7 h1:j+zJOnnEjF/kyHlDDgGnVL/AIqIJPq8UoB2GSNfkUfQ=
go.etcd.io/bbolt v1.3.7/go.mod h1:N9Mkw9X8x5fupy0IKsmuqVtoGDyxsaDlbk4Rd05IAQw=
go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
go.uber.org/atomic v1.10.0 h1:9qC72Qh0+3MqyJbAn8YU5xVq1frD8bn3JtD2oXtafVQ=
go.uber.org/atomic v1.10.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
go.uber.org/goleak v1.1.11/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
go.uber.org/goleak v1.2.0 h1:xqgm/S+aQvhWFTtR0XK3Jvg7z8kGV8P4X14IzwN3Eqk=
go.uber.org/goleak v1.2.0/go.mod h1:XJYK+MuIchqpmGmUSAzotztawfKvYLUIgg7guXrwVUo=
go.uber.org/multierr v1.6.0 h1:y6IPFStTAIT5Ytl7/XYmHvzXQ7S3g/IeZW9hyZ5thw4=
go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9iU=
go.uber.org/zap v1.21.0/go.mod h1:wjWOCqI0f2ZZrJF/UufIOkiC8ii6tm1iqIsLo76RfJw=
go.uber.org/zap v1.23.0 h1:OjGQ5KQDEUawVHxNwQgPpiypGHOxo2mNZsOqTak4fFY=
go.uber.org/zap v1.23.0/go.mod h1:D+nX8jyLsMHMYrln8A0rJjFt/T/9/bGgIhAqxv5URuY=
go4.org/netipx v0.0.0-20220925034521-797b0c90d8ab h1:+yW1yrZ09EYNu1spCUOHBBNRbrLnfmutwyhbhCv3b6Q=
go4.org/netipx v0.0.0-20220925034521-797b0c90d8ab/go.mod h1:tgPU4N2u9RByaTN3NC2p9xOzyFpte4jYwsIIRF7XlSc=
go.uber.org/zap v1.24.0 h1:FiJd5l1UOLj0wCgbSE0rwwXHzEdAZS6hiiSnxJN/D60=
go.uber.org/zap v1.24.0/go.mod h1:2kMP+WWQ8aoFoedH3T2sq6iJ2yDWpHbP0f6MQbS9Gkg=
go4.org/netipx v0.0.0-20230125063823-8449b0a6169f h1:ketMxHg+vWm3yccyYiq+uK8D3fRmna2Fcj+awpQp84s=
go4.org/netipx v0.0.0-20230125063823-8449b0a6169f/go.mod h1:tgPU4N2u9RByaTN3NC2p9xOzyFpte4jYwsIIRF7XlSc=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190404164418-38d8ce5564a5/go.mod h1:WFFai1msRO1wXaEeE5yQxYXgSfI8pQAWXbQop6sCtWE=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a/go.mod h1:P+XmwS30IXTQdn5tA2iutPOUgjI07+tq3H3K9MVA1s8=
golang.org/x/crypto v0.3.0 h1:a06MkbcxBrEFc0w0QIZWXrH/9cCX6KJyWbBOIwAn+7A=
golang.org/x/crypto v0.3.0/go.mod h1:hebNnKkNXi2UzZN1eVRvBB7co0a+JxK6XbPiWVs/3J4=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20221028150844-83b7d23a625f h1:Al51T6tzvuh3oiwX11vex3QgJ2XTedFPGmbEVh8cdoc=
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golang.org/x/tools v0.1.6-0.20210726203631-07bc1bf47fb2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
golang.org/x/tools v0.2.0 h1:G6AHpWxTMGY1KyEYoAQ5WTtIekUUvDNjan3ugu60JvE=
golang.org/x/tools v0.2.0/go.mod h1:y4OqIKeOV/fWJetJ8bXPU1sEVniLMIyDAZWeHdV+NTA=
@ -306,52 +288,23 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
google.golang.org/genproto v0.0.0-20210722135532-667f2b7c528f h1:YORWxaStkWBnWgELOHTmDrqNlFXuVGEbhwbB5iK94bQ=
google.golang.org/genproto v0.0.0-20210722135532-667f2b7c528f/go.mod h1:ob2IJxKrgPT52GcgX759i1sleT07tiKowYBGbczaW48=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
google.golang.org/grpc v1.51.0 h1:E1eGv1FTqoLIdnBCZufiSHgKjlqG6fKFf6pPWtMTh8U=
google.golang.org/grpc v1.51.0/go.mod h1:wgNDFcnuBGmxLKI/qn4T+m5BtEBYXJPvibbUPsAIPww=
google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
google.golang.org/genproto v0.0.0-20230110181048-76db0878b65f h1:BWUVssLB0HVOSY78gIdvk1dTVYtT1y8SBWtPYuTJ/6w=
google.golang.org/genproto v0.0.0-20230110181048-76db0878b65f/go.mod h1:RGgjbofJ8xD9Sq1VVhDM1Vok1vRONV+rg+CjzG4SZKM=
google.golang.org/grpc v1.53.0 h1:LAv2ds7cmFV/XTS3XG1NneeENYrXGmorPxsBbptIjNc=
google.golang.org/grpc v1.53.0/go.mod h1:OnIrk0ipVdj4N5d9IUoFUx72/VlD7+jUsHwZgwSMQpw=
google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
gotest.tools/v3 v3.4.0 h1:ZazjZUfuVeZGLAmlKKuyv3IKP5orXcwtOwDQH6YVr6o=
gotest.tools/v3 v3.4.0/go.mod h1:CtbdzLSsqVhDgMtKsx03ird5YTGB3ar27v0u/yKBW5g=
gvisor.dev/gvisor v0.0.0-20220901235040-6ca97ef2ce1c h1:m5lcgWnL3OElQNVyp3qcncItJ2c0sQlSGjYK2+nJTA4=
gvisor.dev/gvisor v0.0.0-20220901235040-6ca97ef2ce1c/go.mod h1:TIvkJD0sxe8pIob3p6T8IzxXunlp6yfgktvTNp+DGNM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
lukechampine.com/blake3 v1.1.7 h1:GgRMhmdsuK8+ii6UZFDL8Nb+VyMwadAgcJyfYHxG6n0=
lukechampine.com/blake3 v1.1.7/go.mod h1:tkKEOtDkNtklkXtLNEOGNq5tcV90tJiA1vAA12R78LA=

38
test/shadowtls_test.go
View file

@ -17,22 +17,19 @@ import (
func TestShadowTLS(t *testing.T) {
t.Run("v1", func(t *testing.T) {
testShadowTLS(t, "")
testShadowTLS(t, 1, "")
})
t.Run("v2", func(t *testing.T) {
testShadowTLS(t, "hello")
testShadowTLS(t, 2, "hello")
})
t.Run("v3", func(t *testing.T) {
testShadowTLS(t, 3, "hello")
})
}
func testShadowTLS(t *testing.T, password string) {
func testShadowTLS(t *testing.T, version int, password string) {
method := shadowaead_2022.List[0]
ssPassword := mkBase64(t, 16)
var version int
if password != "" {
version = 2
} else {
version = 1
}
startInstance(t, option.Options{
Inbounds: []option.Inbound{
{
@ -123,7 +120,7 @@ func testShadowTLS(t *testing.T, password string) {
testSuit(t, clientPort, testPort)
}
func TestShadowTLSv2Fallback(t *testing.T) {
func TestShadowTLSFallback(t *testing.T) {
startInstance(t, option.Options{
Inbounds: []option.Inbound{
{
@ -139,7 +136,7 @@ func TestShadowTLSv2Fallback(t *testing.T) {
ServerPort: 443,
},
},
Version: 2,
Version: 3,
Password: "hello",
},
},
@ -167,7 +164,7 @@ func TestShadowTLSInbound(t *testing.T) {
Image: ImageShadowTLS,
Ports: []uint16{serverPort, otherPort},
EntryPoint: "shadow-tls",
Cmd: []string{"--threads", "1", "client", "--listen", "0.0.0.0:" + F.ToString(otherPort), "--server", "127.0.0.1:" + F.ToString(serverPort), "--sni", "google.com", "--password", password},
Cmd: []string{"--v3", "--threads", "1", "client", "--listen", "0.0.0.0:" + F.ToString(otherPort), "--server", "127.0.0.1:" + F.ToString(serverPort), "--sni", "google.com", "--password", password},
})
startInstance(t, option.Options{
Inbounds: []option.Inbound{
@ -195,7 +192,7 @@ func TestShadowTLSInbound(t *testing.T) {
ServerPort: 443,
},
},
Version: 2,
Version: 3,
Password: password,
},
},
@ -225,9 +222,6 @@ func TestShadowTLSInbound(t *testing.T) {
},
Method: method,
Password: password,
MultiplexOptions: &option.MultiplexOptions{
Enabled: true,
},
},
},
},
@ -240,7 +234,7 @@ func TestShadowTLSInbound(t *testing.T) {
}},
},
})
testSuit(t, clientPort, testPort)
testTCP(t, clientPort, testPort)
}
func TestShadowTLSOutbound(t *testing.T) {
@ -250,7 +244,8 @@ func TestShadowTLSOutbound(t *testing.T) {
Image: ImageShadowTLS,
Ports: []uint16{serverPort, otherPort},
EntryPoint: "shadow-tls",
Cmd: []string{"--threads", "1", "server", "--listen", "0.0.0.0:" + F.ToString(serverPort), "--server", "127.0.0.1:" + F.ToString(otherPort), "--tls", "google.com:443", "--password", "hello"},
Cmd: []string{"--v3", "--threads", "1", "server", "--listen", "0.0.0.0:" + F.ToString(serverPort), "--server", "127.0.0.1:" + F.ToString(otherPort), "--tls", "google.com:443", "--password", "hello"},
Env: []string{"RUST_LOG=trace"},
})
startInstance(t, option.Options{
Inbounds: []option.Inbound{
@ -285,9 +280,6 @@ func TestShadowTLSOutbound(t *testing.T) {
DialerOptions: option.DialerOptions{
Detour: "detour",
},
MultiplexOptions: &option.MultiplexOptions{
Enabled: true,
},
},
},
{
@ -302,7 +294,7 @@ func TestShadowTLSOutbound(t *testing.T) {
Enabled: true,
ServerName: "google.com",
},
Version: 2,
Version: 3,
Password: "hello",
},
},
@ -320,5 +312,5 @@ func TestShadowTLSOutbound(t *testing.T) {
}},
},
})
testSuit(t, clientPort, testPort)
testTCP(t, clientPort, testPort)
}

294
transport/shadowtls/client_v3.go Normal file
View file

@ -0,0 +1,294 @@
package shadowtls
import (
"bytes"
"crypto/hmac"
"crypto/rand"
"crypto/sha1"
"crypto/sha256"
"encoding/binary"
"hash"
"io"
"net"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/bufio"
E "github.com/sagernet/sing/common/exceptions"
N "github.com/sagernet/sing/common/network"
)
const (
tlsRandomSize = 32
tlsHeaderSize = 5
tlsSessionIDSize = 32
clientHello = 1
serverHello = 2
changeCipherSpec = 20
alert = 21
handshake = 22
applicationData = 23
serverRandomIndex = tlsHeaderSize + 1 + 3 + 2
sessionIDLengthIndex = tlsHeaderSize + 1 + 3 + 2 + tlsRandomSize
tlsHmacHeaderSize = tlsHeaderSize + hmacSize
hmacSize = 4
)
func generateSessionID(password string) func(clientHello []byte, sessionID []byte) error {
return func(clientHello []byte, sessionID []byte) error {
const sessionIDStart = 1 + 3 + 2 + tlsRandomSize + 1
if len(clientHello) < sessionIDStart+tlsSessionIDSize {
return E.New("unexpected client hello length")
}
_, err := rand.Read(sessionID[:tlsSessionIDSize-hmacSize])
if err != nil {
return err
}
hmacSHA1Hash := hmac.New(sha1.New, []byte(password))
hmacSHA1Hash.Write(clientHello[:sessionIDStart])
hmacSHA1Hash.Write(sessionID)
hmacSHA1Hash.Write(clientHello[sessionIDStart+tlsSessionIDSize:])
copy(sessionID[tlsSessionIDSize-hmacSize:], hmacSHA1Hash.Sum(nil)[:hmacSize])
return nil
}
}
type StreamWrapper struct {
net.Conn
password string
buffer *buf.Buffer
serverRandom []byte
readHMAC hash.Hash
readHMACKey []byte
authorized bool
}
func NewStreamWrapper(conn net.Conn, password string) *StreamWrapper {
return &StreamWrapper{
Conn: conn,
password: password,
}
}
func (w *StreamWrapper) Authorized() (bool, []byte, hash.Hash) {
return w.authorized, w.serverRandom, w.readHMAC
}
func (w *StreamWrapper) Read(p []byte) (n int, err error) {
if w.buffer != nil {
if !w.buffer.IsEmpty() {
return w.buffer.Read(p)
}
w.buffer.Release()
w.buffer = nil
}
var tlsHeader [tlsHeaderSize]byte
_, err = io.ReadFull(w.Conn, tlsHeader[:])
if err != nil {
return
}
length := int(binary.BigEndian.Uint16(tlsHeader[3:tlsHeaderSize]))
w.buffer = buf.NewSize(tlsHeaderSize + length)
common.Must1(w.buffer.Write(tlsHeader[:]))
_, err = w.buffer.ReadFullFrom(w.Conn, length)
if err != nil {
return
}
buffer := w.buffer.Bytes()
switch tlsHeader[0] {
case handshake:
if len(buffer) > serverRandomIndex+tlsRandomSize && buffer[5] == serverHello {
w.serverRandom = make([]byte, tlsRandomSize)
copy(w.serverRandom, buffer[serverRandomIndex:serverRandomIndex+tlsRandomSize])
w.readHMAC = hmac.New(sha1.New, []byte(w.password))
w.readHMAC.Write(w.serverRandom)
w.readHMACKey = kdf(w.password, w.serverRandom)
}
case applicationData:
w.authorized = false
if len(buffer) > tlsHmacHeaderSize && w.readHMAC != nil {
w.readHMAC.Write(buffer[tlsHmacHeaderSize:])
if hmac.Equal(w.readHMAC.Sum(nil)[:hmacSize], buffer[tlsHeaderSize:tlsHmacHeaderSize]) {
xorSlice(buffer[tlsHmacHeaderSize:], w.readHMACKey)
copy(buffer[hmacSize:], buffer[:tlsHeaderSize])
binary.BigEndian.PutUint16(buffer[hmacSize+3:], uint16(len(buffer)-tlsHmacHeaderSize))
w.buffer.Advance(hmacSize)
w.authorized = true
}
}
}
return w.buffer.Read(p)
}
func kdf(password string, serverRandom []byte) []byte {
hasher := sha256.New()
hasher.Write([]byte(password))
hasher.Write(serverRandom)
return hasher.Sum(nil)
}
func xorSlice(data []byte, key []byte) {
for i := range data {
data[i] ^= key[i%len(key)]
}
}
var _ N.VectorisedWriter = (*VerifiedConn)(nil)
type VerifiedConn struct {
net.Conn
writer N.VectorisedWriter
hmacAdd hash.Hash
hmacVerify hash.Hash
hmacIgnore hash.Hash
buffer *buf.Buffer
}
func NewVerifiedConn(
conn net.Conn,
hmacAdd hash.Hash,
hmacVerify hash.Hash,
hmacIgnore hash.Hash,
) *VerifiedConn {
return &VerifiedConn{
Conn: conn,
writer: bufio.NewVectorisedWriter(conn),
hmacAdd: hmacAdd,
hmacVerify: hmacVerify,
hmacIgnore: hmacIgnore,
}
}
func (c *VerifiedConn) Read(b []byte) (n int, err error) {
if c.buffer != nil {
if !c.buffer.IsEmpty() {
return c.buffer.Read(b)
}
c.buffer.Release()
c.buffer = nil
}
for {
var tlsHeader [tlsHeaderSize]byte
_, err = io.ReadFull(c.Conn, tlsHeader[:])
if err != nil {
sendAlert(c.Conn)
return
}
length := int(binary.BigEndian.Uint16(tlsHeader[3:tlsHeaderSize]))
c.buffer = buf.NewSize(tlsHeaderSize + length)
common.Must1(c.buffer.Write(tlsHeader[:]))
_, err = c.buffer.ReadFullFrom(c.Conn, length)
if err != nil {
return
}
buffer := c.buffer.Bytes()
switch buffer[0] {
case alert:
err = E.Cause(net.ErrClosed, "remote alert")
return
case applicationData:
if c.hmacIgnore != nil {
if verifyApplicationData(buffer, c.hmacIgnore, false) {
c.buffer.Release()
c.buffer = nil
continue
} else {
c.hmacIgnore = nil
}
}
if !verifyApplicationData(buffer, c.hmacVerify, true) {
sendAlert(c.Conn)
err = E.New("application data verification failed")
return
}
c.buffer.Advance(tlsHmacHeaderSize)
default:
sendAlert(c.Conn)
err = E.New("unexpected TLS record type: ", buffer[0])
return
}
return c.buffer.Read(b)
}
}
func (c *VerifiedConn) Write(p []byte) (n int, err error) {
pTotal := len(p)
for len(p) > 0 {
var pWrite []byte
if len(p) > 16384 {
pWrite = p[:16384]
p = p[16384:]
} else {
pWrite = p
p = nil
}
_, err = c.write(pWrite)
}
if err == nil {
n = pTotal
}
return
}
func (c *VerifiedConn) write(p []byte) (n int, err error) {
var header [tlsHmacHeaderSize]byte
header[0] = applicationData
header[1] = 3
header[2] = 3
binary.BigEndian.PutUint16(header[3:tlsHeaderSize], hmacSize+uint16(len(p)))
c.hmacAdd.Write(p)
hmacHash := c.hmacAdd.Sum(nil)[:hmacSize]
c.hmacAdd.Write(hmacHash)
copy(header[tlsHeaderSize:], hmacHash)
_, err = bufio.WriteVectorised(c.writer, [][]byte{common.Dup(header[:]), p})
if err == nil {
n = len(p)
}
return
}
func (c *VerifiedConn) WriteVectorised(buffers []*buf.Buffer) error {
var header [tlsHmacHeaderSize]byte
header[0] = applicationData
header[1] = 3
header[2] = 3
binary.BigEndian.PutUint16(header[3:tlsHeaderSize], hmacSize+uint16(buf.LenMulti(buffers)))
for _, buffer := range buffers {
c.hmacAdd.Write(buffer.Bytes())
}
c.hmacAdd.Write(c.hmacAdd.Sum(nil)[:hmacSize])
copy(header[tlsHeaderSize:], c.hmacAdd.Sum(nil)[:hmacSize])
return c.writer.WriteVectorised(append([]*buf.Buffer{buf.As(header[:])}, buffers...))
}
func verifyApplicationData(frame []byte, hmac hash.Hash, update bool) bool {
if frame[1] != 3 || frame[2] != 3 || len(frame) < tlsHmacHeaderSize {
return false
}
hmac.Write(frame[tlsHmacHeaderSize:])
hmacHash := hmac.Sum(nil)[:hmacSize]
if update {
hmac.Write(hmacHash)
}
return bytes.Equal(frame[tlsHeaderSize:tlsHeaderSize+hmacSize], hmacHash)
}
func sendAlert(writer io.Writer) {
const recordSize = 31
record := [recordSize]byte{
alert,
3,
3,
0,
recordSize - tlsHeaderSize,
}
_, err := rand.Read(record[tlsHeaderSize:])
if err != nil {
return
}
writer.Write(record[:])
}

157
transport/shadowtls/config.go Normal file
View file

@ -0,0 +1,157 @@
package shadowtls
import (
"crypto/x509"
"net"
"net/netip"
"os"
"github.com/sagernet/sing-box/common/tls"
"github.com/sagernet/sing-box/option"
E "github.com/sagernet/sing/common/exceptions"
)
var _ tls.Config = (*ClientTLSConfig)(nil)
type ClientTLSConfig struct {
config *sTLSConfig
}
func NewClientTLSConfig(serverAddress string, options option.OutboundTLSOptions, password string) (*ClientTLSConfig, error) {
if options.ECH != nil && options.ECH.Enabled {
return nil, E.New("ECH is not supported in shadowtls v3")
} else if options.UTLS != nil && options.UTLS.Enabled {
return nil, E.New("UTLS is not supported in shadowtls v3")
}
var serverName string
if options.ServerName != "" {
serverName = options.ServerName
} else if serverAddress != "" {
if _, err := netip.ParseAddr(serverName); err != nil {
serverName = serverAddress
}
}
if serverName == "" && !options.Insecure {
return nil, E.New("missing server_name or insecure=true")
}
var tlsConfig sTLSConfig
tlsConfig.SessionIDGenerator = generateSessionID(password)
if options.DisableSNI {
tlsConfig.ServerName = "127.0.0.1"
} else {
tlsConfig.ServerName = serverName
}
if options.Insecure {
tlsConfig.InsecureSkipVerify = options.Insecure
} else if options.DisableSNI {
tlsConfig.InsecureSkipVerify = true
tlsConfig.VerifyConnection = func(state sTLSConnectionState) error {
verifyOptions := x509.VerifyOptions{
DNSName: serverName,
Intermediates: x509.NewCertPool(),
}
for _, cert := range state.PeerCertificates[1:] {
verifyOptions.Intermediates.AddCert(cert)
}
_, err := state.PeerCertificates[0].Verify(verifyOptions)
return err
}
}
if len(options.ALPN) > 0 {
tlsConfig.NextProtos = options.ALPN
}
if options.MinVersion != "" {
minVersion, err := tls.ParseTLSVersion(options.MinVersion)
if err != nil {
return nil, E.Cause(err, "parse min_version")
}
tlsConfig.MinVersion = minVersion
}
if options.MaxVersion != "" {
maxVersion, err := tls.ParseTLSVersion(options.MaxVersion)
if err != nil {
return nil, E.Cause(err, "parse max_version")
}
tlsConfig.MaxVersion = maxVersion
}
if options.CipherSuites != nil {
find:
for _, cipherSuite := range options.CipherSuites {
for _, tlsCipherSuite := range sTLSCipherSuites() {
if cipherSuite == tlsCipherSuite.Name {
tlsConfig.CipherSuites = append(tlsConfig.CipherSuites, tlsCipherSuite.ID)
continue find
}
}
return nil, E.New("unknown cipher_suite: ", cipherSuite)
}
}
var certificate []byte
if options.Certificate != "" {
certificate = []byte(options.Certificate)
} else if options.CertificatePath != "" {
content, err := os.ReadFile(options.CertificatePath)
if err != nil {
return nil, E.Cause(err, "read certificate")
}
certificate = content
}
if len(certificate) > 0 {
certPool := x509.NewCertPool()
if !certPool.AppendCertsFromPEM(certificate) {
return nil, E.New("failed to parse certificate:\n\n", certificate)
}
tlsConfig.RootCAs = certPool
}
return &ClientTLSConfig{&tlsConfig}, nil
}
func (c *ClientTLSConfig) ServerName() string {
return c.config.ServerName
}
func (c *ClientTLSConfig) SetServerName(serverName string) {
c.config.ServerName = serverName
}
func (c *ClientTLSConfig) NextProtos() []string {
return c.config.NextProtos
}
func (c *ClientTLSConfig) SetNextProtos(nextProto []string) {
c.config.NextProtos = nextProto
}
func (c *ClientTLSConfig) Config() (*tls.STDConfig, error) {
return nil, E.New("unsupported usage for ShadowTLS")
}
func (c *ClientTLSConfig) Client(conn net.Conn) tls.Conn {
return &shadowTLSConnWrapper{sTLSClient(conn, c.config)}
}
func (c *ClientTLSConfig) Clone() tls.Config {
return &ClientTLSConfig{c.config.Clone()}
}
type shadowTLSConnWrapper struct {
*sTLSConn
}
func (c *shadowTLSConnWrapper) ConnectionState() tls.ConnectionState {
state := c.sTLSConn.ConnectionState()
return tls.ConnectionState{
Version: state.Version,
HandshakeComplete: state.HandshakeComplete,
DidResume: state.DidResume,
CipherSuite: state.CipherSuite,
NegotiatedProtocol: state.NegotiatedProtocol,
ServerName: state.ServerName,
PeerCertificates: state.PeerCertificates,
VerifiedChains: state.VerifiedChains,
SignedCertificateTimestamps: state.SignedCertificateTimestamps,
OCSPResponse: state.OCSPResponse,
}
}

16
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//go:build !go1.20
package shadowtls
import sTLS "github.com/sagernet/sing-box/transport/shadowtls/tls_go119"
type (
sTLSConfig = sTLS.Config
sTLSConnectionState = sTLS.ConnectionState
sTLSConn = sTLS.Conn
)
var (
sTLSCipherSuites = sTLS.CipherSuites
sTLSClient = sTLS.Client
)

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transport/shadowtls/config_120.go Normal file
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//go:build go1.20
package shadowtls
import sTLS "github.com/sagernet/sing-box/transport/shadowtls/tls"
type (
sTLSConfig = sTLS.Config
sTLSConnectionState = sTLS.ConnectionState
sTLSConn = sTLS.Conn
)
var (
sTLSCipherSuites = sTLS.CipherSuites
sTLSClient = sTLS.Client
)

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package shadowtls
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"encoding/binary"
"hash"
"io"
"net"
"github.com/sagernet/sing/common"
"github.com/sagernet/sing/common/buf"
"github.com/sagernet/sing/common/bufio"
E "github.com/sagernet/sing/common/exceptions"
"github.com/sagernet/sing/common/rw"
)
func ExtractFrame(conn net.Conn) (*buf.Buffer, error) {
var tlsHeader [tlsHeaderSize]byte
_, err := io.ReadFull(conn, tlsHeader[:])
if err != nil {
return nil, err
}
length := int(binary.BigEndian.Uint16(tlsHeader[3:]))
buffer := buf.NewSize(tlsHeaderSize + length)
common.Must1(buffer.Write(tlsHeader[:]))
_, err = buffer.ReadFullFrom(conn, length)
if err != nil {
buffer.Release()
}
return buffer, err
}
func VerifyClientHello(frame []byte, password string) error {
const minLen = tlsHeaderSize + 1 + 3 + 2 + tlsRandomSize + 1 + tlsSessionIDSize
const hmacIndex = sessionIDLengthIndex + 1 + tlsSessionIDSize - hmacSize
if len(frame) < minLen {
return io.ErrUnexpectedEOF
} else if frame[0] != handshake {
return E.New("unexpected record type")
} else if frame[5] != clientHello {
return E.New("unexpected handshake type")
} else if frame[sessionIDLengthIndex] != tlsSessionIDSize {
return E.New("unexpected session id length")
}
hmacSHA1Hash := hmac.New(sha1.New, []byte(password))
hmacSHA1Hash.Write(frame[tlsHeaderSize:hmacIndex])
hmacSHA1Hash.Write(rw.ZeroBytes[:4])
hmacSHA1Hash.Write(frame[hmacIndex+hmacSize:])
if !hmac.Equal(frame[hmacIndex:hmacIndex+hmacSize], hmacSHA1Hash.Sum(nil)[:hmacSize]) {
return E.New("hmac mismatch")
}
return nil
}
func ExtractServerRandom(frame []byte) []byte {
const minLen = tlsHeaderSize + 1 + 3 + 2 + tlsRandomSize
if len(frame) < minLen || frame[0] != handshake || frame[5] != serverHello {
return nil
}
serverRandom := make([]byte, tlsRandomSize)
copy(serverRandom, frame[serverRandomIndex:serverRandomIndex+tlsRandomSize])
return serverRandom
}
func IsServerHelloSupportTLS13(frame []byte) bool {
if len(frame) < sessionIDLengthIndex {
return false
}
reader := bytes.NewReader(frame[sessionIDLengthIndex:])
var sessionIdLength uint8
err := binary.Read(reader, binary.BigEndian, &sessionIdLength)
if err != nil {
return false
}
_, err = io.CopyN(io.Discard, reader, int64(sessionIdLength))
if err != nil {
return false
}
_, err = io.CopyN(io.Discard, reader, 3)
if err != nil {
return false
}
var extensionListLength uint16
err = binary.Read(reader, binary.BigEndian, &extensionListLength)
if err != nil {
return false
}
for i := uint16(0); i < extensionListLength; i++ {
var extensionType uint16
err = binary.Read(reader, binary.BigEndian, &extensionType)
if err != nil {
return false
}
var extensionLength uint16
err = binary.Read(reader, binary.BigEndian, &extensionLength)
if err != nil {
return false
}
if extensionType != 43 {
_, err = io.CopyN(io.Discard, reader, int64(extensionLength))
if err != nil {
return false
}
continue
}
if extensionLength != 2 {
return false
}
var extensionValue uint16
err = binary.Read(reader, binary.BigEndian, &extensionValue)
if err != nil {
return false
}
return extensionValue == 0x0304
}
return false
}
func CopyByFrameUntilHMACMatches(conn net.Conn, handshakeConn net.Conn, hmacVerify hash.Hash, hmacReset func()) (*buf.Buffer, error) {
for {
frameBuffer, err := ExtractFrame(conn)
if err != nil {
return nil, E.Cause(err, "read client record")
}
frame := frameBuffer.Bytes()
if len(frame) > tlsHmacHeaderSize && frame[0] == applicationData {
hmacReset()
hmacVerify.Write(frame[tlsHmacHeaderSize:])
hmacHash := hmacVerify.Sum(nil)[:4]
if bytes.Equal(hmacHash, frame[tlsHeaderSize:tlsHmacHeaderSize]) {
hmacReset()
hmacVerify.Write(frame[tlsHmacHeaderSize:])
hmacVerify.Write(frame[tlsHeaderSize:tlsHmacHeaderSize])
frameBuffer.Advance(tlsHmacHeaderSize)
return frameBuffer, nil
}
}
_, err = handshakeConn.Write(frame)
frameBuffer.Release()
if err != nil {
return nil, E.Cause(err, "write clint frame")
}
}
}
func CopyByFrameWithModification(conn net.Conn, handshakeConn net.Conn, password string, serverRandom []byte, hmacWrite hash.Hash) error {
writeKey := kdf(password, serverRandom)
writer := bufio.NewVectorisedWriter(handshakeConn)
for {
frameBuffer, err := ExtractFrame(conn)
if err != nil {
return E.Cause(err, "read server record")
}
frame := frameBuffer.Bytes()
if frame[0] == applicationData {
xorSlice(frame[tlsHeaderSize:], writeKey)
hmacWrite.Write(frame[tlsHeaderSize:])
binary.BigEndian.PutUint16(frame[3:], uint16(len(frame)-tlsHeaderSize+hmacSize))
hmacHash := hmacWrite.Sum(nil)[:4]
_, err = bufio.WriteVectorised(writer, [][]byte{frame[:tlsHeaderSize], hmacHash, frame[tlsHeaderSize:]})
frameBuffer.Release()
if err != nil {
return E.Cause(err, "write modified server frame")
}
} else {
_, err = handshakeConn.Write(frame)
frameBuffer.Release()
if err != nil {
return E.Cause(err, "write server frame")
}
}
}
}

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# tls
crypto/tls fork for shadowtls v3
version: go1.20.0

99
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import "strconv"
type alert uint8
const (
// alert level
alertLevelWarning = 1
alertLevelError = 2
)
const (
alertCloseNotify alert = 0
alertUnexpectedMessage alert = 10
alertBadRecordMAC alert = 20
alertDecryptionFailed alert = 21
alertRecordOverflow alert = 22
alertDecompressionFailure alert = 30
alertHandshakeFailure alert = 40
alertBadCertificate alert = 42
alertUnsupportedCertificate alert = 43
alertCertificateRevoked alert = 44
alertCertificateExpired alert = 45
alertCertificateUnknown alert = 46
alertIllegalParameter alert = 47
alertUnknownCA alert = 48
alertAccessDenied alert = 49
alertDecodeError alert = 50
alertDecryptError alert = 51
alertExportRestriction alert = 60
alertProtocolVersion alert = 70
alertInsufficientSecurity alert = 71
alertInternalError alert = 80
alertInappropriateFallback alert = 86
alertUserCanceled alert = 90
alertNoRenegotiation alert = 100
alertMissingExtension alert = 109
alertUnsupportedExtension alert = 110
alertCertificateUnobtainable alert = 111
alertUnrecognizedName alert = 112
alertBadCertificateStatusResponse alert = 113
alertBadCertificateHashValue alert = 114
alertUnknownPSKIdentity alert = 115
alertCertificateRequired alert = 116
alertNoApplicationProtocol alert = 120
)
var alertText = map[alert]string{
alertCloseNotify: "close notify",
alertUnexpectedMessage: "unexpected message",
alertBadRecordMAC: "bad record MAC",
alertDecryptionFailed: "decryption failed",
alertRecordOverflow: "record overflow",
alertDecompressionFailure: "decompression failure",
alertHandshakeFailure: "handshake failure",
alertBadCertificate: "bad certificate",
alertUnsupportedCertificate: "unsupported certificate",
alertCertificateRevoked: "revoked certificate",
alertCertificateExpired: "expired certificate",
alertCertificateUnknown: "unknown certificate",
alertIllegalParameter: "illegal parameter",
alertUnknownCA: "unknown certificate authority",
alertAccessDenied: "access denied",
alertDecodeError: "error decoding message",
alertDecryptError: "error decrypting message",
alertExportRestriction: "export restriction",
alertProtocolVersion: "protocol version not supported",
alertInsufficientSecurity: "insufficient security level",
alertInternalError: "internal error",
alertInappropriateFallback: "inappropriate fallback",
alertUserCanceled: "user canceled",
alertNoRenegotiation: "no renegotiation",
alertMissingExtension: "missing extension",
alertUnsupportedExtension: "unsupported extension",
alertCertificateUnobtainable: "certificate unobtainable",
alertUnrecognizedName: "unrecognized name",
alertBadCertificateStatusResponse: "bad certificate status response",
alertBadCertificateHashValue: "bad certificate hash value",
alertUnknownPSKIdentity: "unknown PSK identity",
alertCertificateRequired: "certificate required",
alertNoApplicationProtocol: "no application protocol",
}
func (e alert) String() string {
s, ok := alertText[e]
if ok {
return "tls: " + s
}
return "tls: alert(" + strconv.Itoa(int(e)) + ")"
}
func (e alert) Error() string {
return e.String()
}

293
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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/elliptic"
"crypto/rsa"
"errors"
"fmt"
"hash"
"io"
)
// verifyHandshakeSignature verifies a signature against pre-hashed
// (if required) handshake contents.
func verifyHandshakeSignature(sigType uint8, pubkey crypto.PublicKey, hashFunc crypto.Hash, signed, sig []byte) error {
switch sigType {
case signatureECDSA:
pubKey, ok := pubkey.(*ecdsa.PublicKey)
if !ok {
return fmt.Errorf("expected an ECDSA public key, got %T", pubkey)
}
if !ecdsa.VerifyASN1(pubKey, signed, sig) {
return errors.New("ECDSA verification failure")
}
case signatureEd25519:
pubKey, ok := pubkey.(ed25519.PublicKey)
if !ok {
return fmt.Errorf("expected an Ed25519 public key, got %T", pubkey)
}
if !ed25519.Verify(pubKey, signed, sig) {
return errors.New("Ed25519 verification failure")
}
case signaturePKCS1v15:
pubKey, ok := pubkey.(*rsa.PublicKey)
if !ok {
return fmt.Errorf("expected an RSA public key, got %T", pubkey)
}
if err := rsa.VerifyPKCS1v15(pubKey, hashFunc, signed, sig); err != nil {
return err
}
case signatureRSAPSS:
pubKey, ok := pubkey.(*rsa.PublicKey)
if !ok {
return fmt.Errorf("expected an RSA public key, got %T", pubkey)
}
signOpts := &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash}
if err := rsa.VerifyPSS(pubKey, hashFunc, signed, sig, signOpts); err != nil {
return err
}
default:
return errors.New("internal error: unknown signature type")
}
return nil
}
const (
serverSignatureContext = "TLS 1.3, server CertificateVerify\x00"
clientSignatureContext = "TLS 1.3, client CertificateVerify\x00"
)
var signaturePadding = []byte{
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
}
// signedMessage returns the pre-hashed (if necessary) message to be signed by
// certificate keys in TLS 1.3. See RFC 8446, Section 4.4.3.
func signedMessage(sigHash crypto.Hash, context string, transcript hash.Hash) []byte {
if sigHash == directSigning {
b := &bytes.Buffer{}
b.Write(signaturePadding)
io.WriteString(b, context)
b.Write(transcript.Sum(nil))
return b.Bytes()
}
h := sigHash.New()
h.Write(signaturePadding)
io.WriteString(h, context)
h.Write(transcript.Sum(nil))
return h.Sum(nil)
}
// typeAndHashFromSignatureScheme returns the corresponding signature type and
// crypto.Hash for a given TLS SignatureScheme.
func typeAndHashFromSignatureScheme(signatureAlgorithm SignatureScheme) (sigType uint8, hash crypto.Hash, err error) {
switch signatureAlgorithm {
case PKCS1WithSHA1, PKCS1WithSHA256, PKCS1WithSHA384, PKCS1WithSHA512:
sigType = signaturePKCS1v15
case PSSWithSHA256, PSSWithSHA384, PSSWithSHA512:
sigType = signatureRSAPSS
case ECDSAWithSHA1, ECDSAWithP256AndSHA256, ECDSAWithP384AndSHA384, ECDSAWithP521AndSHA512:
sigType = signatureECDSA
case Ed25519:
sigType = signatureEd25519
default:
return 0, 0, fmt.Errorf("unsupported signature algorithm: %v", signatureAlgorithm)
}
switch signatureAlgorithm {
case PKCS1WithSHA1, ECDSAWithSHA1:
hash = crypto.SHA1
case PKCS1WithSHA256, PSSWithSHA256, ECDSAWithP256AndSHA256:
hash = crypto.SHA256
case PKCS1WithSHA384, PSSWithSHA384, ECDSAWithP384AndSHA384:
hash = crypto.SHA384
case PKCS1WithSHA512, PSSWithSHA512, ECDSAWithP521AndSHA512:
hash = crypto.SHA512
case Ed25519:
hash = directSigning
default:
return 0, 0, fmt.Errorf("unsupported signature algorithm: %v", signatureAlgorithm)
}
return sigType, hash, nil
}
// legacyTypeAndHashFromPublicKey returns the fixed signature type and crypto.Hash for
// a given public key used with TLS 1.0 and 1.1, before the introduction of
// signature algorithm negotiation.
func legacyTypeAndHashFromPublicKey(pub crypto.PublicKey) (sigType uint8, hash crypto.Hash, err error) {
switch pub.(type) {
case *rsa.PublicKey:
return signaturePKCS1v15, crypto.MD5SHA1, nil
case *ecdsa.PublicKey:
return signatureECDSA, crypto.SHA1, nil
case ed25519.PublicKey:
// RFC 8422 specifies support for Ed25519 in TLS 1.0 and 1.1,
// but it requires holding on to a handshake transcript to do a
// full signature, and not even OpenSSL bothers with the
// complexity, so we can't even test it properly.
return 0, 0, fmt.Errorf("tls: Ed25519 public keys are not supported before TLS 1.2")
default:
return 0, 0, fmt.Errorf("tls: unsupported public key: %T", pub)
}
}
var rsaSignatureSchemes = []struct {
scheme SignatureScheme
minModulusBytes int
maxVersion uint16
}{
// RSA-PSS is used with PSSSaltLengthEqualsHash, and requires
// emLen >= hLen + sLen + 2
{PSSWithSHA256, crypto.SHA256.Size()*2 + 2, VersionTLS13},
{PSSWithSHA384, crypto.SHA384.Size()*2 + 2, VersionTLS13},
{PSSWithSHA512, crypto.SHA512.Size()*2 + 2, VersionTLS13},
// PKCS #1 v1.5 uses prefixes from hashPrefixes in crypto/rsa, and requires
// emLen >= len(prefix) + hLen + 11
// TLS 1.3 dropped support for PKCS #1 v1.5 in favor of RSA-PSS.
{PKCS1WithSHA256, 19 + crypto.SHA256.Size() + 11, VersionTLS12},
{PKCS1WithSHA384, 19 + crypto.SHA384.Size() + 11, VersionTLS12},
{PKCS1WithSHA512, 19 + crypto.SHA512.Size() + 11, VersionTLS12},
{PKCS1WithSHA1, 15 + crypto.SHA1.Size() + 11, VersionTLS12},
}
// signatureSchemesForCertificate returns the list of supported SignatureSchemes
// for a given certificate, based on the public key and the protocol version,
// and optionally filtered by its explicit SupportedSignatureAlgorithms.
//
// This function must be kept in sync with supportedSignatureAlgorithms.
// FIPS filtering is applied in the caller, selectSignatureScheme.
func signatureSchemesForCertificate(version uint16, cert *Certificate) []SignatureScheme {
priv, ok := cert.PrivateKey.(crypto.Signer)
if !ok {
return nil
}
var sigAlgs []SignatureScheme
switch pub := priv.Public().(type) {
case *ecdsa.PublicKey:
if version != VersionTLS13 {
// In TLS 1.2 and earlier, ECDSA algorithms are not
// constrained to a single curve.
sigAlgs = []SignatureScheme{
ECDSAWithP256AndSHA256,
ECDSAWithP384AndSHA384,
ECDSAWithP521AndSHA512,
ECDSAWithSHA1,
}
break
}
switch pub.Curve {
case elliptic.P256():
sigAlgs = []SignatureScheme{ECDSAWithP256AndSHA256}
case elliptic.P384():
sigAlgs = []SignatureScheme{ECDSAWithP384AndSHA384}
case elliptic.P521():
sigAlgs = []SignatureScheme{ECDSAWithP521AndSHA512}
default:
return nil
}
case *rsa.PublicKey:
size := pub.Size()
sigAlgs = make([]SignatureScheme, 0, len(rsaSignatureSchemes))
for _, candidate := range rsaSignatureSchemes {
if size >= candidate.minModulusBytes && version <= candidate.maxVersion {
sigAlgs = append(sigAlgs, candidate.scheme)
}
}
case ed25519.PublicKey:
sigAlgs = []SignatureScheme{Ed25519}
default:
return nil
}
if cert.SupportedSignatureAlgorithms != nil {
var filteredSigAlgs []SignatureScheme
for _, sigAlg := range sigAlgs {
if isSupportedSignatureAlgorithm(sigAlg, cert.SupportedSignatureAlgorithms) {
filteredSigAlgs = append(filteredSigAlgs, sigAlg)
}
}
return filteredSigAlgs
}
return sigAlgs
}
// selectSignatureScheme picks a SignatureScheme from the peer's preference list
// that works with the selected certificate. It's only called for protocol
// versions that support signature algorithms, so TLS 1.2 and 1.3.
func selectSignatureScheme(vers uint16, c *Certificate, peerAlgs []SignatureScheme) (SignatureScheme, error) {
supportedAlgs := signatureSchemesForCertificate(vers, c)
if len(supportedAlgs) == 0 {
return 0, unsupportedCertificateError(c)
}
if len(peerAlgs) == 0 && vers == VersionTLS12 {
// For TLS 1.2, if the client didn't send signature_algorithms then we
// can assume that it supports SHA1. See RFC 5246, Section 7.4.1.4.1.
peerAlgs = []SignatureScheme{PKCS1WithSHA1, ECDSAWithSHA1}
}
// Pick signature scheme in the peer's preference order, as our
// preference order is not configurable.
for _, preferredAlg := range peerAlgs {
if needFIPS() && !isSupportedSignatureAlgorithm(preferredAlg, fipsSupportedSignatureAlgorithms) {
continue
}
if isSupportedSignatureAlgorithm(preferredAlg, supportedAlgs) {
return preferredAlg, nil
}
}
return 0, errors.New("tls: peer doesn't support any of the certificate's signature algorithms")
}
// unsupportedCertificateError returns a helpful error for certificates with
// an unsupported private key.
func unsupportedCertificateError(cert *Certificate) error {
switch cert.PrivateKey.(type) {
case rsa.PrivateKey, ecdsa.PrivateKey:
return fmt.Errorf("tls: unsupported certificate: private key is %T, expected *%T",
cert.PrivateKey, cert.PrivateKey)
case *ed25519.PrivateKey:
return fmt.Errorf("tls: unsupported certificate: private key is *ed25519.PrivateKey, expected ed25519.PrivateKey")
}
signer, ok := cert.PrivateKey.(crypto.Signer)
if !ok {
return fmt.Errorf("tls: certificate private key (%T) does not implement crypto.Signer",
cert.PrivateKey)
}
switch pub := signer.Public().(type) {
case *ecdsa.PublicKey:
switch pub.Curve {
case elliptic.P256():
case elliptic.P384():
case elliptic.P521():
default:
return fmt.Errorf("tls: unsupported certificate curve (%s)", pub.Curve.Params().Name)
}
case *rsa.PublicKey:
return fmt.Errorf("tls: certificate RSA key size too small for supported signature algorithms")
case ed25519.PublicKey:
default:
return fmt.Errorf("tls: unsupported certificate key (%T)", pub)
}
if cert.SupportedSignatureAlgorithms != nil {
return fmt.Errorf("tls: peer doesn't support the certificate custom signature algorithms")
}
return fmt.Errorf("tls: internal error: unsupported key (%T)", cert.PrivateKey)
}

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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build boringcrypto
package tls
import (
"crypto/internal/boring/fipstls"
)
// needFIPS returns fipstls.Required(); it avoids a new import in common.go.
func needFIPS() bool {
return fipstls.Required()
}
// fipsMinVersion replaces c.minVersion in FIPS-only mode.
func fipsMinVersion(c *Config) uint16 {
// FIPS requires TLS 1.2.
return VersionTLS12
}
// fipsMaxVersion replaces c.maxVersion in FIPS-only mode.
func fipsMaxVersion(c *Config) uint16 {
// FIPS requires TLS 1.2.
return VersionTLS12
}
// default defaultFIPSCurvePreferences is the FIPS-allowed curves,
// in preference order (most preferable first).
var defaultFIPSCurvePreferences = []CurveID{CurveP256, CurveP384, CurveP521}
// fipsCurvePreferences replaces c.curvePreferences in FIPS-only mode.
func fipsCurvePreferences(c *Config) []CurveID {
if c == nil || len(c.CurvePreferences) == 0 {
return defaultFIPSCurvePreferences
}
var list []CurveID
for _, id := range c.CurvePreferences {
for _, allowed := range defaultFIPSCurvePreferences {
if id == allowed {
list = append(list, id)
break
}
}
}
return list
}
// defaultCipherSuitesFIPS are the FIPS-allowed cipher suites.
var defaultCipherSuitesFIPS = []uint16{
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
TLS_RSA_WITH_AES_128_GCM_SHA256,
TLS_RSA_WITH_AES_256_GCM_SHA384,
}
// fipsCipherSuites replaces c.cipherSuites in FIPS-only mode.
func fipsCipherSuites(c *Config) []uint16 {
if c == nil || c.CipherSuites == nil {
return defaultCipherSuitesFIPS
}
list := make([]uint16, 0, len(defaultCipherSuitesFIPS))
for _, id := range c.CipherSuites {
for _, allowed := range defaultCipherSuitesFIPS {
if id == allowed {
list = append(list, id)
break
}
}
}
return list
}
// fipsSupportedSignatureAlgorithms currently are a subset of
// defaultSupportedSignatureAlgorithms without Ed25519 and SHA-1.
var fipsSupportedSignatureAlgorithms = []SignatureScheme{
PSSWithSHA256,
PSSWithSHA384,
PSSWithSHA512,
PKCS1WithSHA256,
ECDSAWithP256AndSHA256,
PKCS1WithSHA384,
ECDSAWithP384AndSHA384,
PKCS1WithSHA512,
ECDSAWithP521AndSHA512,
}
// supportedSignatureAlgorithms returns the supported signature algorithms.
func supportedSignatureAlgorithms() []SignatureScheme {
if !needFIPS() {
return defaultSupportedSignatureAlgorithms
}
return fipsSupportedSignatureAlgorithms
}

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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto/x509"
"runtime"
"sync"
"sync/atomic"
)
type cacheEntry struct {
refs atomic.Int64
cert *x509.Certificate
}
// certCache implements an intern table for reference counted x509.Certificates,
// implemented in a similar fashion to BoringSSL's CRYPTO_BUFFER_POOL. This
// allows for a single x509.Certificate to be kept in memory and referenced from
// multiple Conns. Returned references should not be mutated by callers. Certificates
// are still safe to use after they are removed from the cache.
//
// Certificates are returned wrapped in a activeCert struct that should be held by
// the caller. When references to the activeCert are freed, the number of references
// to the certificate in the cache is decremented. Once the number of references
// reaches zero, the entry is evicted from the cache.
//
// The main difference between this implementation and CRYPTO_BUFFER_POOL is that
// CRYPTO_BUFFER_POOL is a more generic structure which supports blobs of data,
// rather than specific structures. Since we only care about x509.Certificates,
// certCache is implemented as a specific cache, rather than a generic one.
//
// See https://boringssl.googlesource.com/boringssl/+/master/include/openssl/pool.h
// and https://boringssl.googlesource.com/boringssl/+/master/crypto/pool/pool.c
// for the BoringSSL reference.
type certCache struct {
sync.Map
}
var clientCertCache = new(certCache)
// activeCert is a handle to a certificate held in the cache. Once there are
// no alive activeCerts for a given certificate, the certificate is removed
// from the cache by a finalizer.
type activeCert struct {
cert *x509.Certificate
}
// active increments the number of references to the entry, wraps the
// certificate in the entry in a activeCert, and sets the finalizer.
//
// Note that there is a race between active and the finalizer set on the
// returned activeCert, triggered if active is called after the ref count is
// decremented such that refs may be > 0 when evict is called. We consider this
// safe, since the caller holding an activeCert for an entry that is no longer
// in the cache is fine, with the only side effect being the memory overhead of
// there being more than one distinct reference to a certificate alive at once.
func (cc *certCache) active(e *cacheEntry) *activeCert {
e.refs.Add(1)
a := &activeCert{e.cert}
runtime.SetFinalizer(a, func(_ *activeCert) {
if e.refs.Add(-1) == 0 {
cc.evict(e)
}
})
return a
}
// evict removes a cacheEntry from the cache.
func (cc *certCache) evict(e *cacheEntry) {
cc.Delete(string(e.cert.Raw))
}
// newCert returns a x509.Certificate parsed from der. If there is already a copy
// of the certificate in the cache, a reference to the existing certificate will
// be returned. Otherwise, a fresh certificate will be added to the cache, and
// the reference returned. The returned reference should not be mutated.
func (cc *certCache) newCert(der []byte) (*activeCert, error) {
if entry, ok := cc.Load(string(der)); ok {
return cc.active(entry.(*cacheEntry)), nil
}
cert, err := x509.ParseCertificate(der)
if err != nil {
return nil, err
}
entry := &cacheEntry{cert: cert}
if entry, loaded := cc.LoadOrStore(string(der), entry); loaded {
return cc.active(entry.(*cacheEntry)), nil
}
return cc.active(entry), nil
}

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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto"
"crypto/aes"
"crypto/cipher"
"crypto/des"
"crypto/hmac"
"crypto/rc4"
"crypto/sha1"
"crypto/sha256"
"fmt"
"hash"
"runtime"
"golang.org/x/crypto/chacha20poly1305"
"golang.org/x/sys/cpu"
)
// CipherSuite is a TLS cipher suite. Note that most functions in this package
// accept and expose cipher suite IDs instead of this type.
type CipherSuite struct {
ID uint16
Name string
// Supported versions is the list of TLS protocol versions that can
// negotiate this cipher suite.
SupportedVersions []uint16
// Insecure is true if the cipher suite has known security issues
// due to its primitives, design, or implementation.
Insecure bool
}
var (
supportedUpToTLS12 = []uint16{VersionTLS10, VersionTLS11, VersionTLS12}
supportedOnlyTLS12 = []uint16{VersionTLS12}
supportedOnlyTLS13 = []uint16{VersionTLS13}
)
// CipherSuites returns a list of cipher suites currently implemented by this
// package, excluding those with security issues, which are returned by
// InsecureCipherSuites.
//
// The list is sorted by ID. Note that the default cipher suites selected by
// this package might depend on logic that can't be captured by a static list,
// and might not match those returned by this function.
func CipherSuites() []*CipherSuite {
return []*CipherSuite{
{TLS_RSA_WITH_AES_128_CBC_SHA, "TLS_RSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
{TLS_RSA_WITH_AES_256_CBC_SHA, "TLS_RSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
{TLS_RSA_WITH_AES_128_GCM_SHA256, "TLS_RSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
{TLS_RSA_WITH_AES_256_GCM_SHA384, "TLS_RSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},
{TLS_AES_128_GCM_SHA256, "TLS_AES_128_GCM_SHA256", supportedOnlyTLS13, false},
{TLS_AES_256_GCM_SHA384, "TLS_AES_256_GCM_SHA384", supportedOnlyTLS13, false},
{TLS_CHACHA20_POLY1305_SHA256, "TLS_CHACHA20_POLY1305_SHA256", supportedOnlyTLS13, false},
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},
{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},
{TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256", supportedOnlyTLS12, false},
{TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256", supportedOnlyTLS12, false},
}
}
// InsecureCipherSuites returns a list of cipher suites currently implemented by
// this package and which have security issues.
//
// Most applications should not use the cipher suites in this list, and should
// only use those returned by CipherSuites.
func InsecureCipherSuites() []*CipherSuite {
// This list includes RC4, CBC_SHA256, and 3DES cipher suites. See
// cipherSuitesPreferenceOrder for details.
return []*CipherSuite{
{TLS_RSA_WITH_RC4_128_SHA, "TLS_RSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
{TLS_RSA_WITH_3DES_EDE_CBC_SHA, "TLS_RSA_WITH_3DES_EDE_CBC_SHA", supportedUpToTLS12, true},
{TLS_RSA_WITH_AES_128_CBC_SHA256, "TLS_RSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, "TLS_ECDHE_ECDSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
{TLS_ECDHE_RSA_WITH_RC4_128_SHA, "TLS_ECDHE_RSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA", supportedUpToTLS12, true},
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
}
}
// CipherSuiteName returns the standard name for the passed cipher suite ID
// (e.g. "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256"), or a fallback representation
// of the ID value if the cipher suite is not implemented by this package.
func CipherSuiteName(id uint16) string {
for _, c := range CipherSuites() {
if c.ID == id {
return c.Name
}
}
for _, c := range InsecureCipherSuites() {
if c.ID == id {
return c.Name
}
}
return fmt.Sprintf("0x%04X", id)
}
const (
// suiteECDHE indicates that the cipher suite involves elliptic curve
// Diffie-Hellman. This means that it should only be selected when the
// client indicates that it supports ECC with a curve and point format
// that we're happy with.
suiteECDHE = 1 << iota
// suiteECSign indicates that the cipher suite involves an ECDSA or
// EdDSA signature and therefore may only be selected when the server's
// certificate is ECDSA or EdDSA. If this is not set then the cipher suite
// is RSA based.
suiteECSign
// suiteTLS12 indicates that the cipher suite should only be advertised
// and accepted when using TLS 1.2.
suiteTLS12
// suiteSHA384 indicates that the cipher suite uses SHA384 as the
// handshake hash.
suiteSHA384
)
// A cipherSuite is a TLS 1.0–1.2 cipher suite, and defines the key exchange
// mechanism, as well as the cipher+MAC pair or the AEAD.
type cipherSuite struct {
id uint16
// the lengths, in bytes, of the key material needed for each component.
keyLen int
macLen int
ivLen int
ka func(version uint16) keyAgreement
// flags is a bitmask of the suite* values, above.
flags int
cipher func(key, iv []byte, isRead bool) any
mac func(key []byte) hash.Hash
aead func(key, fixedNonce []byte) aead
}
var cipherSuites = []*cipherSuite{ // TODO: replace with a map, since the order doesn't matter.
{TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305, 32, 0, 12, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadChaCha20Poly1305},
{TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, 32, 0, 12, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, nil, nil, aeadChaCha20Poly1305},
{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadAESGCM},
{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, nil, nil, aeadAESGCM},
{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, ecdheRSAKA, suiteECDHE | suiteTLS12, cipherAES, macSHA256, nil},
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, cipherAES, macSHA256, nil},
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherAES, macSHA1, nil},
{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherAES, macSHA1, nil},
{TLS_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, rsaKA, suiteTLS12, nil, nil, aeadAESGCM},
{TLS_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, rsaKA, suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
{TLS_RSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, rsaKA, suiteTLS12, cipherAES, macSHA256, nil},
{TLS_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
{TLS_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, ecdheRSAKA, suiteECDHE, cipher3DES, macSHA1, nil},
{TLS_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, rsaKA, 0, cipher3DES, macSHA1, nil},
{TLS_RSA_WITH_RC4_128_SHA, 16, 20, 0, rsaKA, 0, cipherRC4, macSHA1, nil},
{TLS_ECDHE_RSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheRSAKA, suiteECDHE, cipherRC4, macSHA1, nil},
{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherRC4, macSHA1, nil},
}
// selectCipherSuite returns the first TLS 1.0–1.2 cipher suite from ids which
// is also in supportedIDs and passes the ok filter.
func selectCipherSuite(ids, supportedIDs []uint16, ok func(*cipherSuite) bool) *cipherSuite {
for _, id := range ids {
candidate := cipherSuiteByID(id)
if candidate == nil || !ok(candidate) {
continue
}
for _, suppID := range supportedIDs {
if id == suppID {
return candidate
}
}
}
return nil
}
// A cipherSuiteTLS13 defines only the pair of the AEAD algorithm and hash
// algorithm to be used with HKDF. See RFC 8446, Appendix B.4.
type cipherSuiteTLS13 struct {
id uint16
keyLen int
aead func(key, fixedNonce []byte) aead
hash crypto.Hash
}
var cipherSuitesTLS13 = []*cipherSuiteTLS13{ // TODO: replace with a map.
{TLS_AES_128_GCM_SHA256, 16, aeadAESGCMTLS13, crypto.SHA256},
{TLS_CHACHA20_POLY1305_SHA256, 32, aeadChaCha20Poly1305, crypto.SHA256},
{TLS_AES_256_GCM_SHA384, 32, aeadAESGCMTLS13, crypto.SHA384},
}
// cipherSuitesPreferenceOrder is the order in which we'll select (on the
// server) or advertise (on the client) TLS 1.0–1.2 cipher suites.
//
// Cipher suites are filtered but not reordered based on the application and
// peer's preferences, meaning we'll never select a suite lower in this list if
// any higher one is available. This makes it more defensible to keep weaker
// cipher suites enabled, especially on the server side where we get the last
// word, since there are no known downgrade attacks on cipher suites selection.
//
// The list is sorted by applying the following priority rules, stopping at the
// first (most important) applicable one:
//
// - Anything else comes before RC4
//
// RC4 has practically exploitable biases. See https://www.rc4nomore.com.
//
// - Anything else comes before CBC_SHA256
//
// SHA-256 variants of the CBC ciphersuites don't implement any Lucky13
// countermeasures. See http://www.isg.rhul.ac.uk/tls/Lucky13.html and
// https://www.imperialviolet.org/2013/02/04/luckythirteen.html.
//
// - Anything else comes before 3DES
//
// 3DES has 64-bit blocks, which makes it fundamentally susceptible to
// birthday attacks. See https://sweet32.info.
//
// - ECDHE comes before anything else
//
// Once we got the broken stuff out of the way, the most important
// property a cipher suite can have is forward secrecy. We don't
// implement FFDHE, so that means ECDHE.
//
// - AEADs come before CBC ciphers
//
// Even with Lucky13 countermeasures, MAC-then-Encrypt CBC cipher suites
// are fundamentally fragile, and suffered from an endless sequence of
// padding oracle attacks. See https://eprint.iacr.org/2015/1129,
// https://www.imperialviolet.org/2014/12/08/poodleagain.html, and
// https://blog.cloudflare.com/yet-another-padding-oracle-in-openssl-cbc-ciphersuites/.
//
// - AES comes before ChaCha20
//
// When AES hardware is available, AES-128-GCM and AES-256-GCM are faster
// than ChaCha20Poly1305.
//
// When AES hardware is not available, AES-128-GCM is one or more of: much
// slower, way more complex, and less safe (because not constant time)
// than ChaCha20Poly1305.
//
// We use this list if we think both peers have AES hardware, and
// cipherSuitesPreferenceOrderNoAES otherwise.
//
// - AES-128 comes before AES-256
//
// The only potential advantages of AES-256 are better multi-target
// margins, and hypothetical post-quantum properties. Neither apply to
// TLS, and AES-256 is slower due to its four extra rounds (which don't
// contribute to the advantages above).
//
// - ECDSA comes before RSA
//
// The relative order of ECDSA and RSA cipher suites doesn't matter,
// as they depend on the certificate. Pick one to get a stable order.
var cipherSuitesPreferenceOrder = []uint16{
// AEADs w/ ECDHE
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
// CBC w/ ECDHE
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
// AEADs w/o ECDHE
TLS_RSA_WITH_AES_128_GCM_SHA256,
TLS_RSA_WITH_AES_256_GCM_SHA384,
// CBC w/o ECDHE
TLS_RSA_WITH_AES_128_CBC_SHA,
TLS_RSA_WITH_AES_256_CBC_SHA,
// 3DES
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_RSA_WITH_3DES_EDE_CBC_SHA,
// CBC_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_RSA_WITH_AES_128_CBC_SHA256,
// RC4
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_RC4_128_SHA,
}
var cipherSuitesPreferenceOrderNoAES = []uint16{
// ChaCha20Poly1305
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
// AES-GCM w/ ECDHE
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
// The rest of cipherSuitesPreferenceOrder.
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
TLS_RSA_WITH_AES_128_GCM_SHA256,
TLS_RSA_WITH_AES_256_GCM_SHA384,
TLS_RSA_WITH_AES_128_CBC_SHA,
TLS_RSA_WITH_AES_256_CBC_SHA,
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_RSA_WITH_AES_128_CBC_SHA256,
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_RC4_128_SHA,
}
// disabledCipherSuites are not used unless explicitly listed in
// Config.CipherSuites. They MUST be at the end of cipherSuitesPreferenceOrder.
var disabledCipherSuites = []uint16{
// CBC_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_RSA_WITH_AES_128_CBC_SHA256,
// RC4
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_RC4_128_SHA,
}
var (
defaultCipherSuitesLen = len(cipherSuitesPreferenceOrder) - len(disabledCipherSuites)
defaultCipherSuites = cipherSuitesPreferenceOrder[:defaultCipherSuitesLen]
)
// defaultCipherSuitesTLS13 is also the preference order, since there are no
// disabled by default TLS 1.3 cipher suites. The same AES vs ChaCha20 logic as
// cipherSuitesPreferenceOrder applies.
var defaultCipherSuitesTLS13 = []uint16{
TLS_AES_128_GCM_SHA256,
TLS_AES_256_GCM_SHA384,
TLS_CHACHA20_POLY1305_SHA256,
}
var defaultCipherSuitesTLS13NoAES = []uint16{
TLS_CHACHA20_POLY1305_SHA256,
TLS_AES_128_GCM_SHA256,
TLS_AES_256_GCM_SHA384,
}
var (
hasGCMAsmAMD64 = cpu.X86.HasAES && cpu.X86.HasPCLMULQDQ
hasGCMAsmARM64 = cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
// Keep in sync with crypto/aes/cipher_s390x.go.
hasGCMAsmS390X = cpu.S390X.HasAES && cpu.S390X.HasAESCBC && cpu.S390X.HasAESCTR &&
(cpu.S390X.HasGHASH || cpu.S390X.HasAESGCM)
hasAESGCMHardwareSupport = runtime.GOARCH == "amd64" && hasGCMAsmAMD64 ||
runtime.GOARCH == "arm64" && hasGCMAsmARM64 ||
runtime.GOARCH == "s390x" && hasGCMAsmS390X
)
var aesgcmCiphers = map[uint16]bool{
// TLS 1.2
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256: true,
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384: true,
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256: true,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384: true,
// TLS 1.3
TLS_AES_128_GCM_SHA256: true,
TLS_AES_256_GCM_SHA384: true,
}
var nonAESGCMAEADCiphers = map[uint16]bool{
// TLS 1.2
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305: true,
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305: true,
// TLS 1.3
TLS_CHACHA20_POLY1305_SHA256: true,
}
// aesgcmPreferred returns whether the first known cipher in the preference list
// is an AES-GCM cipher, implying the peer has hardware support for it.
func aesgcmPreferred(ciphers []uint16) bool {
for _, cID := range ciphers {
if c := cipherSuiteByID(cID); c != nil {
return aesgcmCiphers[cID]
}
if c := cipherSuiteTLS13ByID(cID); c != nil {
return aesgcmCiphers[cID]
}
}
return false
}
func cipherRC4(key, iv []byte, isRead bool) any {
cipher, _ := rc4.NewCipher(key)
return cipher
}
func cipher3DES(key, iv []byte, isRead bool) any {
block, _ := des.NewTripleDESCipher(key)
if isRead {
return cipher.NewCBCDecrypter(block, iv)
}
return cipher.NewCBCEncrypter(block, iv)
}
func cipherAES(key, iv []byte, isRead bool) any {
block, _ := aes.NewCipher(key)
if isRead {
return cipher.NewCBCDecrypter(block, iv)
}
return cipher.NewCBCEncrypter(block, iv)
}
// macSHA1 returns a SHA-1 based constant time MAC.
func macSHA1(key []byte) hash.Hash {
h := sha1.New
// The BoringCrypto SHA1 does not have a constant-time
// checksum function, so don't try to use it.
// if !boring.Enabled {
h = newConstantTimeHash(h)
//}
return hmac.New(h, key)
}
// macSHA256 returns a SHA-256 based MAC. This is only supported in TLS 1.2 and
// is currently only used in disabled-by-default cipher suites.
func macSHA256(key []byte) hash.Hash {
return hmac.New(sha256.New, key)
}
type aead interface {
cipher.AEAD
// explicitNonceLen returns the number of bytes of explicit nonce
// included in each record. This is eight for older AEADs and
// zero for modern ones.
explicitNonceLen() int
}
const (
aeadNonceLength = 12
noncePrefixLength = 4
)
// prefixNonceAEAD wraps an AEAD and prefixes a fixed portion of the nonce to
// each call.
type prefixNonceAEAD struct {
// nonce contains the fixed part of the nonce in the first four bytes.
nonce [aeadNonceLength]byte
aead cipher.AEAD
}
func (f *prefixNonceAEAD) NonceSize() int { return aeadNonceLength - noncePrefixLength }
func (f *prefixNonceAEAD) Overhead() int { return f.aead.Overhead() }
func (f *prefixNonceAEAD) explicitNonceLen() int { return f.NonceSize() }
func (f *prefixNonceAEAD) Seal(out, nonce, plaintext, additionalData []byte) []byte {
copy(f.nonce[4:], nonce)
return f.aead.Seal(out, f.nonce[:], plaintext, additionalData)
}
func (f *prefixNonceAEAD) Open(out, nonce, ciphertext, additionalData []byte) ([]byte, error) {
copy(f.nonce[4:], nonce)
return f.aead.Open(out, f.nonce[:], ciphertext, additionalData)
}
// xorNonceAEAD wraps an AEAD by XORing in a fixed pattern to the nonce
// before each call.
type xorNonceAEAD struct {
nonceMask [aeadNonceLength]byte
aead cipher.AEAD
}
func (f *xorNonceAEAD) NonceSize() int { return 8 } // 64-bit sequence number
func (f *xorNonceAEAD) Overhead() int { return f.aead.Overhead() }
func (f *xorNonceAEAD) explicitNonceLen() int { return 0 }
func (f *xorNonceAEAD) Seal(out, nonce, plaintext, additionalData []byte) []byte {
for i, b := range nonce {
f.nonceMask[4+i] ^= b
}
result := f.aead.Seal(out, f.nonceMask[:], plaintext, additionalData)
for i, b := range nonce {
f.nonceMask[4+i] ^= b
}
return result
}
func (f *xorNonceAEAD) Open(out, nonce, ciphertext, additionalData []byte) ([]byte, error) {
for i, b := range nonce {
f.nonceMask[4+i] ^= b
}
result, err := f.aead.Open(out, f.nonceMask[:], ciphertext, additionalData)
for i, b := range nonce {
f.nonceMask[4+i] ^= b
}
return result, err
}
func aeadAESGCM(key, noncePrefix []byte) aead {
if len(noncePrefix) != noncePrefixLength {
panic("tls: internal error: wrong nonce length")
}
aes, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
var aead cipher.AEAD
//if boring.Enabled {
// aead, err = boring.NewGCMTLS(aes)
//} else {
// boring.Unreachable()
aead, err = cipher.NewGCM(aes)
//}
if err != nil {
panic(err)
}
ret := &prefixNonceAEAD{aead: aead}
copy(ret.nonce[:], noncePrefix)
return ret
}
func aeadAESGCMTLS13(key, nonceMask []byte) aead {
if len(nonceMask) != aeadNonceLength {
panic("tls: internal error: wrong nonce length")
}
aes, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
aead, err := cipher.NewGCM(aes)
if err != nil {
panic(err)
}
ret := &xorNonceAEAD{aead: aead}
copy(ret.nonceMask[:], nonceMask)
return ret
}
func aeadChaCha20Poly1305(key, nonceMask []byte) aead {
if len(nonceMask) != aeadNonceLength {
panic("tls: internal error: wrong nonce length")
}
aead, err := chacha20poly1305.New(key)
if err != nil {
panic(err)
}
ret := &xorNonceAEAD{aead: aead}
copy(ret.nonceMask[:], nonceMask)
return ret
}
type constantTimeHash interface {
hash.Hash
ConstantTimeSum(b []byte) []byte
}
// cthWrapper wraps any hash.Hash that implements ConstantTimeSum, and replaces
// with that all calls to Sum. It's used to obtain a ConstantTimeSum-based HMAC.
type cthWrapper struct {
h constantTimeHash
}
func (c *cthWrapper) Size() int { return c.h.Size() }
func (c *cthWrapper) BlockSize() int { return c.h.BlockSize() }
func (c *cthWrapper) Reset() { c.h.Reset() }
func (c *cthWrapper) Write(p []byte) (int, error) { return c.h.Write(p) }
func (c *cthWrapper) Sum(b []byte) []byte { return c.h.ConstantTimeSum(b) }
func newConstantTimeHash(h func() hash.Hash) func() hash.Hash {
// boring.Unreachable()
return func() hash.Hash {
return &cthWrapper{h().(constantTimeHash)}
}
}
// tls10MAC implements the TLS 1.0 MAC function. RFC 2246, Section 6.2.3.
func tls10MAC(h hash.Hash, out, seq, header, data, extra []byte) []byte {
h.Reset()
h.Write(seq)
h.Write(header)
h.Write(data)
res := h.Sum(out)
if extra != nil {
h.Write(extra)
}
return res
}
func rsaKA(version uint16) keyAgreement {
return rsaKeyAgreement{}
}
func ecdheECDSAKA(version uint16) keyAgreement {
return &ecdheKeyAgreement{
isRSA: false,
version: version,
}
}
func ecdheRSAKA(version uint16) keyAgreement {
return &ecdheKeyAgreement{
isRSA: true,
version: version,
}
}
// mutualCipherSuite returns a cipherSuite given a list of supported
// ciphersuites and the id requested by the peer.
func mutualCipherSuite(have []uint16, want uint16) *cipherSuite {
for _, id := range have {
if id == want {
return cipherSuiteByID(id)
}
}
return nil
}
func cipherSuiteByID(id uint16) *cipherSuite {
for _, cipherSuite := range cipherSuites {
if cipherSuite.id == id {
return cipherSuite
}
}
return nil
}
func mutualCipherSuiteTLS13(have []uint16, want uint16) *cipherSuiteTLS13 {
for _, id := range have {
if id == want {
return cipherSuiteTLS13ByID(id)
}
}
return nil
}
func cipherSuiteTLS13ByID(id uint16) *cipherSuiteTLS13 {
for _, cipherSuite := range cipherSuitesTLS13 {
if cipherSuite.id == id {
return cipherSuite
}
}
return nil
}
// A list of cipher suite IDs that are, or have been, implemented by this
// package.
//
// See https://www.iana.org/assignments/tls-parameters/tls-parameters.xml
const (
// TLS 1.0 - 1.2 cipher suites.
TLS_RSA_WITH_RC4_128_SHA uint16 = 0x0005
TLS_RSA_WITH_3DES_EDE_CBC_SHA uint16 = 0x000a
TLS_RSA_WITH_AES_128_CBC_SHA uint16 = 0x002f
TLS_RSA_WITH_AES_256_CBC_SHA uint16 = 0x0035
TLS_RSA_WITH_AES_128_CBC_SHA256 uint16 = 0x003c
TLS_RSA_WITH_AES_128_GCM_SHA256 uint16 = 0x009c
TLS_RSA_WITH_AES_256_GCM_SHA384 uint16 = 0x009d
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA uint16 = 0xc007
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA uint16 = 0xc009
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA uint16 = 0xc00a
TLS_ECDHE_RSA_WITH_RC4_128_SHA uint16 = 0xc011
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA uint16 = 0xc012
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA uint16 = 0xc013
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA uint16 = 0xc014
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 uint16 = 0xc023
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 uint16 = 0xc027
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02f
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02b
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 uint16 = 0xc030
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 uint16 = 0xc02c
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xcca8
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xcca9
// TLS 1.3 cipher suites.
TLS_AES_128_GCM_SHA256 uint16 = 0x1301
TLS_AES_256_GCM_SHA384 uint16 = 0x1302
TLS_CHACHA20_POLY1305_SHA256 uint16 = 0x1303
// TLS_FALLBACK_SCSV isn't a standard cipher suite but an indicator
// that the client is doing version fallback. See RFC 7507.
TLS_FALLBACK_SCSV uint16 = 0x5600
// Legacy names for the corresponding cipher suites with the correct _SHA256
// suffix, retained for backward compatibility.
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305 = TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305 = TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
)

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// Code generated by "stringer -type=SignatureScheme,CurveID,ClientAuthType -output=common_string.go"; DO NOT EDIT.
package tls
import "strconv"
func _() {
// An "invalid array index" compiler error signifies that the constant values have changed.
// Re-run the stringer command to generate them again.
var x [1]struct{}
_ = x[PKCS1WithSHA256-1025]
_ = x[PKCS1WithSHA384-1281]
_ = x[PKCS1WithSHA512-1537]
_ = x[PSSWithSHA256-2052]
_ = x[PSSWithSHA384-2053]
_ = x[PSSWithSHA512-2054]
_ = x[ECDSAWithP256AndSHA256-1027]
_ = x[ECDSAWithP384AndSHA384-1283]
_ = x[ECDSAWithP521AndSHA512-1539]
_ = x[Ed25519-2055]
_ = x[PKCS1WithSHA1-513]
_ = x[ECDSAWithSHA1-515]
}
const (
_SignatureScheme_name_0 = "PKCS1WithSHA1"
_SignatureScheme_name_1 = "ECDSAWithSHA1"
_SignatureScheme_name_2 = "PKCS1WithSHA256"
_SignatureScheme_name_3 = "ECDSAWithP256AndSHA256"
_SignatureScheme_name_4 = "PKCS1WithSHA384"
_SignatureScheme_name_5 = "ECDSAWithP384AndSHA384"
_SignatureScheme_name_6 = "PKCS1WithSHA512"
_SignatureScheme_name_7 = "ECDSAWithP521AndSHA512"
_SignatureScheme_name_8 = "PSSWithSHA256PSSWithSHA384PSSWithSHA512Ed25519"
)
var (
_SignatureScheme_index_8 = [...]uint8{0, 13, 26, 39, 46}
)
func (i SignatureScheme) String() string {
switch {
case i == 513:
return _SignatureScheme_name_0
case i == 515:
return _SignatureScheme_name_1
case i == 1025:
return _SignatureScheme_name_2
case i == 1027:
return _SignatureScheme_name_3
case i == 1281:
return _SignatureScheme_name_4
case i == 1283:
return _SignatureScheme_name_5
case i == 1537:
return _SignatureScheme_name_6
case i == 1539:
return _SignatureScheme_name_7
case 2052 <= i && i <= 2055:
i -= 2052
return _SignatureScheme_name_8[_SignatureScheme_index_8[i]:_SignatureScheme_index_8[i+1]]
default:
return "SignatureScheme(" + strconv.FormatInt(int64(i), 10) + ")"
}
}
func _() {
// An "invalid array index" compiler error signifies that the constant values have changed.
// Re-run the stringer command to generate them again.
var x [1]struct{}
_ = x[CurveP256-23]
_ = x[CurveP384-24]
_ = x[CurveP521-25]
_ = x[X25519-29]
}
const (
_CurveID_name_0 = "CurveP256CurveP384CurveP521"
_CurveID_name_1 = "X25519"
)
var (
_CurveID_index_0 = [...]uint8{0, 9, 18, 27}
)
func (i CurveID) String() string {
switch {
case 23 <= i && i <= 25:
i -= 23
return _CurveID_name_0[_CurveID_index_0[i]:_CurveID_index_0[i+1]]
case i == 29:
return _CurveID_name_1
default:
return "CurveID(" + strconv.FormatInt(int64(i), 10) + ")"
}
}
func _() {
// An "invalid array index" compiler error signifies that the constant values have changed.
// Re-run the stringer command to generate them again.
var x [1]struct{}
_ = x[NoClientCert-0]
_ = x[RequestClientCert-1]
_ = x[RequireAnyClientCert-2]
_ = x[VerifyClientCertIfGiven-3]
_ = x[RequireAndVerifyClientCert-4]
}
const _ClientAuthType_name = "NoClientCertRequestClientCertRequireAnyClientCertVerifyClientCertIfGivenRequireAndVerifyClientCert"
var _ClientAuthType_index = [...]uint8{0, 12, 29, 49, 72, 98}
func (i ClientAuthType) String() string {
if i < 0 || i >= ClientAuthType(len(_ClientAuthType_index)-1) {
return "ClientAuthType(" + strconv.FormatInt(int64(i), 10) + ")"
}
return _ClientAuthType_name[_ClientAuthType_index[i]:_ClientAuthType_index[i+1]]
}

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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"bytes"
"context"
"crypto"
"crypto/hmac"
"crypto/rsa"
"errors"
"hash"
"time"
"crypto/ecdh"
)
type clientHandshakeStateTLS13 struct {
c *Conn
ctx context.Context
serverHello *serverHelloMsg
hello *clientHelloMsg
ecdheKey *ecdh.PrivateKey
session *ClientSessionState
earlySecret []byte
binderKey []byte
certReq *certificateRequestMsgTLS13
usingPSK bool
sentDummyCCS bool
suite *cipherSuiteTLS13
transcript hash.Hash
masterSecret []byte
trafficSecret []byte // client_application_traffic_secret_0
}
// handshake requires hs.c, hs.hello, hs.serverHello, hs.ecdheKey, and,
// optionally, hs.session, hs.earlySecret and hs.binderKey to be set.
func (hs *clientHandshakeStateTLS13) handshake() error {
c := hs.c
if needFIPS() {
return errors.New("tls: internal error: TLS 1.3 reached in FIPS mode")
}
// The server must not select TLS 1.3 in a renegotiation. See RFC 8446,
// sections 4.1.2 and 4.1.3.
if c.handshakes > 0 {
c.sendAlert(alertProtocolVersion)
return errors.New("tls: server selected TLS 1.3 in a renegotiation")
}
// Consistency check on the presence of a keyShare and its parameters.
if hs.ecdheKey == nil || len(hs.hello.keyShares) != 1 {
return c.sendAlert(alertInternalError)
}
if err := hs.checkServerHelloOrHRR(); err != nil {
return err
}
hs.transcript = hs.suite.hash.New()
hs.transcript.Write(hs.hello.marshal())
if bytes.Equal(hs.serverHello.random, helloRetryRequestRandom) {
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
if err := hs.processHelloRetryRequest(); err != nil {
return err
}
}
hs.transcript.Write(hs.serverHello.marshal())
c.buffering = true
if err := hs.processServerHello(); err != nil {
return err
}
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
if err := hs.establishHandshakeKeys(); err != nil {
return err
}
if err := hs.readServerParameters(); err != nil {
return err
}
if err := hs.readServerCertificate(); err != nil {
return err
}
if err := hs.readServerFinished(); err != nil {
return err
}
if err := hs.sendClientCertificate(); err != nil {
return err
}
if err := hs.sendClientFinished(); err != nil {
return err
}
if _, err := c.flush(); err != nil {
return err
}
c.isHandshakeComplete.Store(true)
return nil
}
// checkServerHelloOrHRR does validity checks that apply to both ServerHello and
// HelloRetryRequest messages. It sets hs.suite.
func (hs *clientHandshakeStateTLS13) checkServerHelloOrHRR() error {
c := hs.c
if hs.serverHello.supportedVersion == 0 {
c.sendAlert(alertMissingExtension)
return errors.New("tls: server selected TLS 1.3 using the legacy version field")
}
if hs.serverHello.supportedVersion != VersionTLS13 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected an invalid version after a HelloRetryRequest")
}
if hs.serverHello.vers != VersionTLS12 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server sent an incorrect legacy version")
}
if hs.serverHello.ocspStapling ||
hs.serverHello.ticketSupported ||
hs.serverHello.secureRenegotiationSupported ||
len(hs.serverHello.secureRenegotiation) != 0 ||
len(hs.serverHello.alpnProtocol) != 0 ||
len(hs.serverHello.scts) != 0 {
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: server sent a ServerHello extension forbidden in TLS 1.3")
}
if !bytes.Equal(hs.hello.sessionId, hs.serverHello.sessionId) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server did not echo the legacy session ID")
}
if hs.serverHello.compressionMethod != compressionNone {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected unsupported compression format")
}
selectedSuite := mutualCipherSuiteTLS13(hs.hello.cipherSuites, hs.serverHello.cipherSuite)
if hs.suite != nil && selectedSuite != hs.suite {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server changed cipher suite after a HelloRetryRequest")
}
if selectedSuite == nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server chose an unconfigured cipher suite")
}
hs.suite = selectedSuite
c.cipherSuite = hs.suite.id
return nil
}
// sendDummyChangeCipherSpec sends a ChangeCipherSpec record for compatibility
// with middleboxes that didn't implement TLS correctly. See RFC 8446, Appendix D.4.
func (hs *clientHandshakeStateTLS13) sendDummyChangeCipherSpec() error {
if hs.sentDummyCCS {
return nil
}
hs.sentDummyCCS = true
_, err := hs.c.writeRecord(recordTypeChangeCipherSpec, []byte{1})
return err
}
// processHelloRetryRequest handles the HRR in hs.serverHello, modifies and
// resends hs.hello, and reads the new ServerHello into hs.serverHello.
func (hs *clientHandshakeStateTLS13) processHelloRetryRequest() error {
c := hs.c
// The first ClientHello gets double-hashed into the transcript upon a
// HelloRetryRequest. (The idea is that the server might offload transcript
// storage to the client in the cookie.) See RFC 8446, Section 4.4.1.
chHash := hs.transcript.Sum(nil)
hs.transcript.Reset()
hs.transcript.Write([]byte{typeMessageHash, 0, 0, uint8(len(chHash))})
hs.transcript.Write(chHash)
hs.transcript.Write(hs.serverHello.marshal())
// The only HelloRetryRequest extensions we support are key_share and
// cookie, and clients must abort the handshake if the HRR would not result
// in any change in the ClientHello.
if hs.serverHello.selectedGroup == 0 && hs.serverHello.cookie == nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server sent an unnecessary HelloRetryRequest message")
}
if hs.serverHello.cookie != nil {
hs.hello.cookie = hs.serverHello.cookie
}
if hs.serverHello.serverShare.group != 0 {
c.sendAlert(alertDecodeError)
return errors.New("tls: received malformed key_share extension")
}
// If the server sent a key_share extension selecting a group, ensure it's
// a group we advertised but did not send a key share for, and send a key
// share for it this time.
if curveID := hs.serverHello.selectedGroup; curveID != 0 {
curveOK := false
for _, id := range hs.hello.supportedCurves {
if id == curveID {
curveOK = true
break
}
}
if !curveOK {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected unsupported group")
}
if sentID, _ := curveIDForCurve(hs.ecdheKey.Curve()); sentID == curveID {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server sent an unnecessary HelloRetryRequest key_share")
}
if _, ok := curveForCurveID(curveID); !ok {
c.sendAlert(alertInternalError)
return errors.New("tls: CurvePreferences includes unsupported curve")
}
key, err := generateECDHEKey(c.config.rand(), curveID)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
hs.ecdheKey = key
hs.hello.keyShares = []keyShare{{group: curveID, data: key.PublicKey().Bytes()}}
}
hs.hello.raw = nil
if len(hs.hello.pskIdentities) > 0 {
pskSuite := cipherSuiteTLS13ByID(hs.session.cipherSuite)
if pskSuite == nil {
return c.sendAlert(alertInternalError)
}
if pskSuite.hash == hs.suite.hash {
// Update binders and obfuscated_ticket_age.
ticketAge := uint32(c.config.time().Sub(hs.session.receivedAt) / time.Millisecond)
hs.hello.pskIdentities[0].obfuscatedTicketAge = ticketAge + hs.session.ageAdd
transcript := hs.suite.hash.New()
transcript.Write([]byte{typeMessageHash, 0, 0, uint8(len(chHash))})
transcript.Write(chHash)
transcript.Write(hs.serverHello.marshal())
transcript.Write(hs.hello.marshalWithoutBinders())
pskBinders := [][]byte{hs.suite.finishedHash(hs.binderKey, transcript)}
hs.hello.updateBinders(pskBinders)
} else {
// Server selected a cipher suite incompatible with the PSK.
hs.hello.pskIdentities = nil
hs.hello.pskBinders = nil
}
}
hs.transcript.Write(hs.hello.marshal())
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
return err
}
msg, err := c.readHandshake()
if err != nil {
return err
}
serverHello, ok := msg.(*serverHelloMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(serverHello, msg)
}
hs.serverHello = serverHello
if err := hs.checkServerHelloOrHRR(); err != nil {
return err
}
return nil
}
func (hs *clientHandshakeStateTLS13) processServerHello() error {
c := hs.c
if bytes.Equal(hs.serverHello.random, helloRetryRequestRandom) {
c.sendAlert(alertUnexpectedMessage)
return errors.New("tls: server sent two HelloRetryRequest messages")
}
if len(hs.serverHello.cookie) != 0 {
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: server sent a cookie in a normal ServerHello")
}
if hs.serverHello.selectedGroup != 0 {
c.sendAlert(alertDecodeError)
return errors.New("tls: malformed key_share extension")
}
if hs.serverHello.serverShare.group == 0 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server did not send a key share")
}
if sentID, _ := curveIDForCurve(hs.ecdheKey.Curve()); hs.serverHello.serverShare.group != sentID {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected unsupported group")
}
if !hs.serverHello.selectedIdentityPresent {
return nil
}
if int(hs.serverHello.selectedIdentity) >= len(hs.hello.pskIdentities) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected an invalid PSK")
}
if len(hs.hello.pskIdentities) != 1 || hs.session == nil {
return c.sendAlert(alertInternalError)
}
pskSuite := cipherSuiteTLS13ByID(hs.session.cipherSuite)
if pskSuite == nil {
return c.sendAlert(alertInternalError)
}
if pskSuite.hash != hs.suite.hash {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected an invalid PSK and cipher suite pair")
}
hs.usingPSK = true
c.didResume = true
c.peerCertificates = hs.session.serverCertificates
c.verifiedChains = hs.session.verifiedChains
c.ocspResponse = hs.session.ocspResponse
c.scts = hs.session.scts
return nil
}
func (hs *clientHandshakeStateTLS13) establishHandshakeKeys() error {
c := hs.c
peerKey, err := hs.ecdheKey.Curve().NewPublicKey(hs.serverHello.serverShare.data)
if err != nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid server key share")
}
sharedKey, err := hs.ecdheKey.ECDH(peerKey)
if err != nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid server key share")
}
earlySecret := hs.earlySecret
if !hs.usingPSK {
earlySecret = hs.suite.extract(nil, nil)
}
handshakeSecret := hs.suite.extract(sharedKey,
hs.suite.deriveSecret(earlySecret, "derived", nil))
clientSecret := hs.suite.deriveSecret(handshakeSecret,
clientHandshakeTrafficLabel, hs.transcript)
c.out.setTrafficSecret(hs.suite, clientSecret)
serverSecret := hs.suite.deriveSecret(handshakeSecret,
serverHandshakeTrafficLabel, hs.transcript)
c.in.setTrafficSecret(hs.suite, serverSecret)
err = c.config.writeKeyLog(keyLogLabelClientHandshake, hs.hello.random, clientSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerHandshake, hs.hello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
hs.masterSecret = hs.suite.extract(nil,
hs.suite.deriveSecret(handshakeSecret, "derived", nil))
return nil
}
func (hs *clientHandshakeStateTLS13) readServerParameters() error {
c := hs.c
msg, err := c.readHandshake()
if err != nil {
return err
}
encryptedExtensions, ok := msg.(*encryptedExtensionsMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(encryptedExtensions, msg)
}
hs.transcript.Write(encryptedExtensions.marshal())
if err := checkALPN(hs.hello.alpnProtocols, encryptedExtensions.alpnProtocol); err != nil {
c.sendAlert(alertUnsupportedExtension)
return err
}
c.clientProtocol = encryptedExtensions.alpnProtocol
return nil
}
func (hs *clientHandshakeStateTLS13) readServerCertificate() error {
c := hs.c
// Either a PSK or a certificate is always used, but not both.
// See RFC 8446, Section 4.1.1.
if hs.usingPSK {
// Make sure the connection is still being verified whether or not this
// is a resumption. Resumptions currently don't reverify certificates so
// they don't call verifyServerCertificate. See Issue 31641.
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
return nil
}
msg, err := c.readHandshake()
if err != nil {
return err
}
certReq, ok := msg.(*certificateRequestMsgTLS13)
if ok {
hs.transcript.Write(certReq.marshal())
hs.certReq = certReq
msg, err = c.readHandshake()
if err != nil {
return err
}
}
certMsg, ok := msg.(*certificateMsgTLS13)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certMsg, msg)
}
if len(certMsg.certificate.Certificate) == 0 {
c.sendAlert(alertDecodeError)
return errors.New("tls: received empty certificates message")
}
hs.transcript.Write(certMsg.marshal())
c.scts = certMsg.certificate.SignedCertificateTimestamps
c.ocspResponse = certMsg.certificate.OCSPStaple
if err := c.verifyServerCertificate(certMsg.certificate.Certificate); err != nil {
return err
}
msg, err = c.readHandshake()
if err != nil {
return err
}
certVerify, ok := msg.(*certificateVerifyMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certVerify, msg)
}
// See RFC 8446, Section 4.4.3.
if !isSupportedSignatureAlgorithm(certVerify.signatureAlgorithm, supportedSignatureAlgorithms()) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: certificate used with invalid signature algorithm")
}
sigType, sigHash, err := typeAndHashFromSignatureScheme(certVerify.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
if sigType == signaturePKCS1v15 || sigHash == crypto.SHA1 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: certificate used with invalid signature algorithm")
}
signed := signedMessage(sigHash, serverSignatureContext, hs.transcript)
if err := verifyHandshakeSignature(sigType, c.peerCertificates[0].PublicKey,
sigHash, signed, certVerify.signature); err != nil {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid signature by the server certificate: " + err.Error())
}
hs.transcript.Write(certVerify.marshal())
return nil
}
func (hs *clientHandshakeStateTLS13) readServerFinished() error {
c := hs.c
msg, err := c.readHandshake()
if err != nil {
return err
}
finished, ok := msg.(*finishedMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(finished, msg)
}
expectedMAC := hs.suite.finishedHash(c.in.trafficSecret, hs.transcript)
if !hmac.Equal(expectedMAC, finished.verifyData) {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid server finished hash")
}
hs.transcript.Write(finished.marshal())
// Derive secrets that take context through the server Finished.
hs.trafficSecret = hs.suite.deriveSecret(hs.masterSecret,
clientApplicationTrafficLabel, hs.transcript)
serverSecret := hs.suite.deriveSecret(hs.masterSecret,
serverApplicationTrafficLabel, hs.transcript)
c.in.setTrafficSecret(hs.suite, serverSecret)
err = c.config.writeKeyLog(keyLogLabelClientTraffic, hs.hello.random, hs.trafficSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerTraffic, hs.hello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
c.ekm = hs.suite.exportKeyingMaterial(hs.masterSecret, hs.transcript)
return nil
}
func (hs *clientHandshakeStateTLS13) sendClientCertificate() error {
c := hs.c
if hs.certReq == nil {
return nil
}
cert, err := c.getClientCertificate(&CertificateRequestInfo{
AcceptableCAs: hs.certReq.certificateAuthorities,
SignatureSchemes: hs.certReq.supportedSignatureAlgorithms,
Version: c.vers,
ctx: hs.ctx,
})
if err != nil {
return err
}
certMsg := new(certificateMsgTLS13)
certMsg.certificate = *cert
certMsg.scts = hs.certReq.scts && len(cert.SignedCertificateTimestamps) > 0
certMsg.ocspStapling = hs.certReq.ocspStapling && len(cert.OCSPStaple) > 0
hs.transcript.Write(certMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certMsg.marshal()); err != nil {
return err
}
// If we sent an empty certificate message, skip the CertificateVerify.
if len(cert.Certificate) == 0 {
return nil
}
certVerifyMsg := new(certificateVerifyMsg)
certVerifyMsg.hasSignatureAlgorithm = true
certVerifyMsg.signatureAlgorithm, err = selectSignatureScheme(c.vers, cert, hs.certReq.supportedSignatureAlgorithms)
if err != nil {
// getClientCertificate returned a certificate incompatible with the
// CertificateRequestInfo supported signature algorithms.
c.sendAlert(alertHandshakeFailure)
return err
}
sigType, sigHash, err := typeAndHashFromSignatureScheme(certVerifyMsg.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
signed := signedMessage(sigHash, clientSignatureContext, hs.transcript)
signOpts := crypto.SignerOpts(sigHash)
if sigType == signatureRSAPSS {
signOpts = &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash, Hash: sigHash}
}
sig, err := cert.PrivateKey.(crypto.Signer).Sign(c.config.rand(), signed, signOpts)
if err != nil {
c.sendAlert(alertInternalError)
return errors.New("tls: failed to sign handshake: " + err.Error())
}
certVerifyMsg.signature = sig
hs.transcript.Write(certVerifyMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certVerifyMsg.marshal()); err != nil {
return err
}
return nil
}
func (hs *clientHandshakeStateTLS13) sendClientFinished() error {
c := hs.c
finished := &finishedMsg{
verifyData: hs.suite.finishedHash(c.out.trafficSecret, hs.transcript),
}
hs.transcript.Write(finished.marshal())
if _, err := c.writeRecord(recordTypeHandshake, finished.marshal()); err != nil {
return err
}
c.out.setTrafficSecret(hs.suite, hs.trafficSecret)
if !c.config.SessionTicketsDisabled && c.config.ClientSessionCache != nil {
c.resumptionSecret = hs.suite.deriveSecret(hs.masterSecret,
resumptionLabel, hs.transcript)
}
return nil
}
func (c *Conn) handleNewSessionTicket(msg *newSessionTicketMsgTLS13) error {
if !c.isClient {
c.sendAlert(alertUnexpectedMessage)
return errors.New("tls: received new session ticket from a client")
}
if c.config.SessionTicketsDisabled || c.config.ClientSessionCache == nil {
return nil
}
// See RFC 8446, Section 4.6.1.
if msg.lifetime == 0 {
return nil
}
lifetime := time.Duration(msg.lifetime) * time.Second
if lifetime > maxSessionTicketLifetime {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: received a session ticket with invalid lifetime")
}
cipherSuite := cipherSuiteTLS13ByID(c.cipherSuite)
if cipherSuite == nil || c.resumptionSecret == nil {
return c.sendAlert(alertInternalError)
}
// Save the resumption_master_secret and nonce instead of deriving the PSK
// to do the least amount of work on NewSessionTicket messages before we
// know if the ticket will be used. Forward secrecy of resumed connections
// is guaranteed by the requirement for pskModeDHE.
session := &ClientSessionState{
sessionTicket: msg.label,
vers: c.vers,
cipherSuite: c.cipherSuite,
masterSecret: c.resumptionSecret,
serverCertificates: c.peerCertificates,
verifiedChains: c.verifiedChains,
receivedAt: c.config.time(),
nonce: msg.nonce,
useBy: c.config.time().Add(lifetime),
ageAdd: msg.ageAdd,
ocspResponse: c.ocspResponse,
scts: c.scts,
}
cacheKey := clientSessionCacheKey(c.conn.RemoteAddr(), c.config)
c.config.ClientSessionCache.Put(cacheKey, session)
return nil
}

1819
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"context"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/subtle"
"crypto/x509"
"errors"
"fmt"
"hash"
"io"
"time"
)
// serverHandshakeState contains details of a server handshake in progress.
// It's discarded once the handshake has completed.
type serverHandshakeState struct {
c *Conn
ctx context.Context
clientHello *clientHelloMsg
hello *serverHelloMsg
suite *cipherSuite
ecdheOk bool
ecSignOk bool
rsaDecryptOk bool
rsaSignOk bool
sessionState *sessionState
finishedHash finishedHash
masterSecret []byte
cert *Certificate
}
// serverHandshake performs a TLS handshake as a server.
func (c *Conn) serverHandshake(ctx context.Context) error {
clientHello, err := c.readClientHello(ctx)
if err != nil {
return err
}
if c.vers == VersionTLS13 {
hs := serverHandshakeStateTLS13{
c: c,
ctx: ctx,
clientHello: clientHello,
}
return hs.handshake()
}
hs := serverHandshakeState{
c: c,
ctx: ctx,
clientHello: clientHello,
}
return hs.handshake()
}
func (hs *serverHandshakeState) handshake() error {
c := hs.c
if err := hs.processClientHello(); err != nil {
return err
}
// For an overview of TLS handshaking, see RFC 5246, Section 7.3.
c.buffering = true
if hs.checkForResumption() {
// The client has included a session ticket and so we do an abbreviated handshake.
c.didResume = true
if err := hs.doResumeHandshake(); err != nil {
return err
}
if err := hs.establishKeys(); err != nil {
return err
}
if err := hs.sendSessionTicket(); err != nil {
return err
}
if err := hs.sendFinished(c.serverFinished[:]); err != nil {
return err
}
if _, err := c.flush(); err != nil {
return err
}
c.clientFinishedIsFirst = false
if err := hs.readFinished(nil); err != nil {
return err
}
} else {
// The client didn't include a session ticket, or it wasn't
// valid so we do a full handshake.
if err := hs.pickCipherSuite(); err != nil {
return err
}
if err := hs.doFullHandshake(); err != nil {
return err
}
if err := hs.establishKeys(); err != nil {
return err
}
if err := hs.readFinished(c.clientFinished[:]); err != nil {
return err
}
c.clientFinishedIsFirst = true
c.buffering = true
if err := hs.sendSessionTicket(); err != nil {
return err
}
if err := hs.sendFinished(nil); err != nil {
return err
}
if _, err := c.flush(); err != nil {
return err
}
}
c.ekm = ekmFromMasterSecret(c.vers, hs.suite, hs.masterSecret, hs.clientHello.random, hs.hello.random)
c.isHandshakeComplete.Store(true)
return nil
}
// readClientHello reads a ClientHello message and selects the protocol version.
func (c *Conn) readClientHello(ctx context.Context) (*clientHelloMsg, error) {
msg, err := c.readHandshake()
if err != nil {
return nil, err
}
clientHello, ok := msg.(*clientHelloMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return nil, unexpectedMessageError(clientHello, msg)
}
var configForClient *Config
originalConfig := c.config
if c.config.GetConfigForClient != nil {
chi := clientHelloInfo(ctx, c, clientHello)
if configForClient, err = c.config.GetConfigForClient(chi); err != nil {
c.sendAlert(alertInternalError)
return nil, err
} else if configForClient != nil {
c.config = configForClient
}
}
c.ticketKeys = originalConfig.ticketKeys(configForClient)
clientVersions := clientHello.supportedVersions
if len(clientHello.supportedVersions) == 0 {
clientVersions = supportedVersionsFromMax(clientHello.vers)
}
c.vers, ok = c.config.mutualVersion(roleServer, clientVersions)
if !ok {
c.sendAlert(alertProtocolVersion)
return nil, fmt.Errorf("tls: client offered only unsupported versions: %x", clientVersions)
}
c.haveVers = true
c.in.version = c.vers
c.out.version = c.vers
return clientHello, nil
}
func (hs *serverHandshakeState) processClientHello() error {
c := hs.c
hs.hello = new(serverHelloMsg)
hs.hello.vers = c.vers
foundCompression := false
// We only support null compression, so check that the client offered it.
for _, compression := range hs.clientHello.compressionMethods {
if compression == compressionNone {
foundCompression = true
break
}
}
if !foundCompression {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: client does not support uncompressed connections")
}
hs.hello.random = make([]byte, 32)
serverRandom := hs.hello.random
// Downgrade protection canaries. See RFC 8446, Section 4.1.3.
maxVers := c.config.maxSupportedVersion(roleServer)
if maxVers >= VersionTLS12 && c.vers < maxVers || testingOnlyForceDowngradeCanary {
if c.vers == VersionTLS12 {
copy(serverRandom[24:], downgradeCanaryTLS12)
} else {
copy(serverRandom[24:], downgradeCanaryTLS11)
}
serverRandom = serverRandom[:24]
}
_, err := io.ReadFull(c.config.rand(), serverRandom)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
if len(hs.clientHello.secureRenegotiation) != 0 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: initial handshake had non-empty renegotiation extension")
}
hs.hello.secureRenegotiationSupported = hs.clientHello.secureRenegotiationSupported
hs.hello.compressionMethod = compressionNone
if len(hs.clientHello.serverName) > 0 {
c.serverName = hs.clientHello.serverName
}
selectedProto, err := negotiateALPN(c.config.NextProtos, hs.clientHello.alpnProtocols)
if err != nil {
c.sendAlert(alertNoApplicationProtocol)
return err
}
hs.hello.alpnProtocol = selectedProto
c.clientProtocol = selectedProto
hs.cert, err = c.config.getCertificate(clientHelloInfo(hs.ctx, c, hs.clientHello))
if err != nil {
if err == errNoCertificates {
c.sendAlert(alertUnrecognizedName)
} else {
c.sendAlert(alertInternalError)
}
return err
}
if hs.clientHello.scts {
hs.hello.scts = hs.cert.SignedCertificateTimestamps
}
hs.ecdheOk = supportsECDHE(c.config, hs.clientHello.supportedCurves, hs.clientHello.supportedPoints)
if hs.ecdheOk && len(hs.clientHello.supportedPoints) > 0 {
// Although omitting the ec_point_formats extension is permitted, some
// old OpenSSL version will refuse to handshake if not present.
//
// Per RFC 4492, section 5.1.2, implementations MUST support the
// uncompressed point format. See golang.org/issue/31943.
hs.hello.supportedPoints = []uint8{pointFormatUncompressed}
}
if priv, ok := hs.cert.PrivateKey.(crypto.Signer); ok {
switch priv.Public().(type) {
case *ecdsa.PublicKey:
hs.ecSignOk = true
case ed25519.PublicKey:
hs.ecSignOk = true
case *rsa.PublicKey:
hs.rsaSignOk = true
default:
c.sendAlert(alertInternalError)
return fmt.Errorf("tls: unsupported signing key type (%T)", priv.Public())
}
}
if priv, ok := hs.cert.PrivateKey.(crypto.Decrypter); ok {
switch priv.Public().(type) {
case *rsa.PublicKey:
hs.rsaDecryptOk = true
default:
c.sendAlert(alertInternalError)
return fmt.Errorf("tls: unsupported decryption key type (%T)", priv.Public())
}
}
return nil
}
// negotiateALPN picks a shared ALPN protocol that both sides support in server
// preference order. If ALPN is not configured or the peer doesn't support it,
// it returns "" and no error.
func negotiateALPN(serverProtos, clientProtos []string) (string, error) {
if len(serverProtos) == 0 || len(clientProtos) == 0 {
return "", nil
}
var http11fallback bool
for _, s := range serverProtos {
for _, c := range clientProtos {
if s == c {
return s, nil
}
if s == "h2" && c == "http/1.1" {
http11fallback = true
}
}
}
// As a special case, let http/1.1 clients connect to h2 servers as if they
// didn't support ALPN. We used not to enforce protocol overlap, so over
// time a number of HTTP servers were configured with only "h2", but
// expected to accept connections from "http/1.1" clients. See Issue 46310.
if http11fallback {
return "", nil
}
return "", fmt.Errorf("tls: client requested unsupported application protocols (%s)", clientProtos)
}
// supportsECDHE returns whether ECDHE key exchanges can be used with this
// pre-TLS 1.3 client.
func supportsECDHE(c *Config, supportedCurves []CurveID, supportedPoints []uint8) bool {
supportsCurve := false
for _, curve := range supportedCurves {
if c.supportsCurve(curve) {
supportsCurve = true
break
}
}
supportsPointFormat := false
for _, pointFormat := range supportedPoints {
if pointFormat == pointFormatUncompressed {
supportsPointFormat = true
break
}
}
// Per RFC 8422, Section 5.1.2, if the Supported Point Formats extension is
// missing, uncompressed points are supported. If supportedPoints is empty,
// the extension must be missing, as an empty extension body is rejected by
// the parser. See https://go.dev/issue/49126.
if len(supportedPoints) == 0 {
supportsPointFormat = true
}
return supportsCurve && supportsPointFormat
}
func (hs *serverHandshakeState) pickCipherSuite() error {
c := hs.c
preferenceOrder := cipherSuitesPreferenceOrder
if !hasAESGCMHardwareSupport || !aesgcmPreferred(hs.clientHello.cipherSuites) {
preferenceOrder = cipherSuitesPreferenceOrderNoAES
}
configCipherSuites := c.config.cipherSuites()
preferenceList := make([]uint16, 0, len(configCipherSuites))
for _, suiteID := range preferenceOrder {
for _, id := range configCipherSuites {
if id == suiteID {
preferenceList = append(preferenceList, id)
break
}
}
}
hs.suite = selectCipherSuite(preferenceList, hs.clientHello.cipherSuites, hs.cipherSuiteOk)
if hs.suite == nil {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: no cipher suite supported by both client and server")
}
c.cipherSuite = hs.suite.id
for _, id := range hs.clientHello.cipherSuites {
if id == TLS_FALLBACK_SCSV {
// The client is doing a fallback connection. See RFC 7507.
if hs.clientHello.vers < c.config.maxSupportedVersion(roleServer) {
c.sendAlert(alertInappropriateFallback)
return errors.New("tls: client using inappropriate protocol fallback")
}
break
}
}
return nil
}
func (hs *serverHandshakeState) cipherSuiteOk(c *cipherSuite) bool {
if c.flags&suiteECDHE != 0 {
if !hs.ecdheOk {
return false
}
if c.flags&suiteECSign != 0 {
if !hs.ecSignOk {
return false
}
} else if !hs.rsaSignOk {
return false
}
} else if !hs.rsaDecryptOk {
return false
}
if hs.c.vers < VersionTLS12 && c.flags&suiteTLS12 != 0 {
return false
}
return true
}
// checkForResumption reports whether we should perform resumption on this connection.
func (hs *serverHandshakeState) checkForResumption() bool {
c := hs.c
if c.config.SessionTicketsDisabled {
return false
}
plaintext, usedOldKey := c.decryptTicket(hs.clientHello.sessionTicket)
if plaintext == nil {
return false
}
hs.sessionState = &sessionState{usedOldKey: usedOldKey}
ok := hs.sessionState.unmarshal(plaintext)
if !ok {
return false
}
createdAt := time.Unix(int64(hs.sessionState.createdAt), 0)
if c.config.time().Sub(createdAt) > maxSessionTicketLifetime {
return false
}
// Never resume a session for a different TLS version.
if c.vers != hs.sessionState.vers {
return false
}
cipherSuiteOk := false
// Check that the client is still offering the ciphersuite in the session.
for _, id := range hs.clientHello.cipherSuites {
if id == hs.sessionState.cipherSuite {
cipherSuiteOk = true
break
}
}
if !cipherSuiteOk {
return false
}
// Check that we also support the ciphersuite from the session.
hs.suite = selectCipherSuite([]uint16{hs.sessionState.cipherSuite},
c.config.cipherSuites(), hs.cipherSuiteOk)
if hs.suite == nil {
return false
}
sessionHasClientCerts := len(hs.sessionState.certificates) != 0
needClientCerts := requiresClientCert(c.config.ClientAuth)
if needClientCerts && !sessionHasClientCerts {
return false
}
if sessionHasClientCerts && c.config.ClientAuth == NoClientCert {
return false
}
return true
}
func (hs *serverHandshakeState) doResumeHandshake() error {
c := hs.c
hs.hello.cipherSuite = hs.suite.id
c.cipherSuite = hs.suite.id
// We echo the client's session ID in the ServerHello to let it know
// that we're doing a resumption.
hs.hello.sessionId = hs.clientHello.sessionId
hs.hello.ticketSupported = hs.sessionState.usedOldKey
hs.finishedHash = newFinishedHash(c.vers, hs.suite)
hs.finishedHash.discardHandshakeBuffer()
hs.finishedHash.Write(hs.clientHello.marshal())
hs.finishedHash.Write(hs.hello.marshal())
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
return err
}
if err := c.processCertsFromClient(Certificate{
Certificate: hs.sessionState.certificates,
}); err != nil {
return err
}
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
hs.masterSecret = hs.sessionState.masterSecret
return nil
}
func (hs *serverHandshakeState) doFullHandshake() error {
c := hs.c
if hs.clientHello.ocspStapling && len(hs.cert.OCSPStaple) > 0 {
hs.hello.ocspStapling = true
}
hs.hello.ticketSupported = hs.clientHello.ticketSupported && !c.config.SessionTicketsDisabled
hs.hello.cipherSuite = hs.suite.id
hs.finishedHash = newFinishedHash(hs.c.vers, hs.suite)
if c.config.ClientAuth == NoClientCert {
// No need to keep a full record of the handshake if client
// certificates won't be used.
hs.finishedHash.discardHandshakeBuffer()
}
hs.finishedHash.Write(hs.clientHello.marshal())
hs.finishedHash.Write(hs.hello.marshal())
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
return err
}
certMsg := new(certificateMsg)
certMsg.certificates = hs.cert.Certificate
hs.finishedHash.Write(certMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certMsg.marshal()); err != nil {
return err
}
if hs.hello.ocspStapling {
certStatus := new(certificateStatusMsg)
certStatus.response = hs.cert.OCSPStaple
hs.finishedHash.Write(certStatus.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certStatus.marshal()); err != nil {
return err
}
}
keyAgreement := hs.suite.ka(c.vers)
skx, err := keyAgreement.generateServerKeyExchange(c.config, hs.cert, hs.clientHello, hs.hello)
if err != nil {
c.sendAlert(alertHandshakeFailure)
return err
}
if skx != nil {
hs.finishedHash.Write(skx.marshal())
if _, err := c.writeRecord(recordTypeHandshake, skx.marshal()); err != nil {
return err
}
}
var certReq *certificateRequestMsg
if c.config.ClientAuth >= RequestClientCert {
// Request a client certificate
certReq = new(certificateRequestMsg)
certReq.certificateTypes = []byte{
byte(certTypeRSASign),
byte(certTypeECDSASign),
}
if c.vers >= VersionTLS12 {
certReq.hasSignatureAlgorithm = true
certReq.supportedSignatureAlgorithms = supportedSignatureAlgorithms()
}
// An empty list of certificateAuthorities signals to
// the client that it may send any certificate in response
// to our request. When we know the CAs we trust, then
// we can send them down, so that the client can choose
// an appropriate certificate to give to us.
if c.config.ClientCAs != nil {
certReq.certificateAuthorities = c.config.ClientCAs.Subjects()
}
hs.finishedHash.Write(certReq.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certReq.marshal()); err != nil {
return err
}
}
helloDone := new(serverHelloDoneMsg)
hs.finishedHash.Write(helloDone.marshal())
if _, err := c.writeRecord(recordTypeHandshake, helloDone.marshal()); err != nil {
return err
}
if _, err := c.flush(); err != nil {
return err
}
var pub crypto.PublicKey // public key for client auth, if any
msg, err := c.readHandshake()
if err != nil {
return err
}
// If we requested a client certificate, then the client must send a
// certificate message, even if it's empty.
if c.config.ClientAuth >= RequestClientCert {
certMsg, ok := msg.(*certificateMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certMsg, msg)
}
hs.finishedHash.Write(certMsg.marshal())
if err := c.processCertsFromClient(Certificate{
Certificate: certMsg.certificates,
}); err != nil {
return err
}
if len(certMsg.certificates) != 0 {
pub = c.peerCertificates[0].PublicKey
}
msg, err = c.readHandshake()
if err != nil {
return err
}
}
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
// Get client key exchange
ckx, ok := msg.(*clientKeyExchangeMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(ckx, msg)
}
hs.finishedHash.Write(ckx.marshal())
preMasterSecret, err := keyAgreement.processClientKeyExchange(c.config, hs.cert, ckx, c.vers)
if err != nil {
c.sendAlert(alertHandshakeFailure)
return err
}
hs.masterSecret = masterFromPreMasterSecret(c.vers, hs.suite, preMasterSecret, hs.clientHello.random, hs.hello.random)
if err := c.config.writeKeyLog(keyLogLabelTLS12, hs.clientHello.random, hs.masterSecret); err != nil {
c.sendAlert(alertInternalError)
return err
}
// If we received a client cert in response to our certificate request message,
// the client will send us a certificateVerifyMsg immediately after the
// clientKeyExchangeMsg. This message is a digest of all preceding
// handshake-layer messages that is signed using the private key corresponding
// to the client's certificate. This allows us to verify that the client is in
// possession of the private key of the certificate.
if len(c.peerCertificates) > 0 {
msg, err = c.readHandshake()
if err != nil {
return err
}
certVerify, ok := msg.(*certificateVerifyMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certVerify, msg)
}
var sigType uint8
var sigHash crypto.Hash
if c.vers >= VersionTLS12 {
if !isSupportedSignatureAlgorithm(certVerify.signatureAlgorithm, certReq.supportedSignatureAlgorithms) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client certificate used with invalid signature algorithm")
}
sigType, sigHash, err = typeAndHashFromSignatureScheme(certVerify.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
} else {
sigType, sigHash, err = legacyTypeAndHashFromPublicKey(pub)
if err != nil {
c.sendAlert(alertIllegalParameter)
return err
}
}
signed := hs.finishedHash.hashForClientCertificate(sigType, sigHash)
if err := verifyHandshakeSignature(sigType, pub, sigHash, signed, certVerify.signature); err != nil {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid signature by the client certificate: " + err.Error())
}
hs.finishedHash.Write(certVerify.marshal())
}
hs.finishedHash.discardHandshakeBuffer()
return nil
}
func (hs *serverHandshakeState) establishKeys() error {
c := hs.c
clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV := keysFromMasterSecret(c.vers, hs.suite, hs.masterSecret, hs.clientHello.random, hs.hello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen)
var clientCipher, serverCipher any
var clientHash, serverHash hash.Hash
if hs.suite.aead == nil {
clientCipher = hs.suite.cipher(clientKey, clientIV, true /* for reading */)
clientHash = hs.suite.mac(clientMAC)
serverCipher = hs.suite.cipher(serverKey, serverIV, false /* not for reading */)
serverHash = hs.suite.mac(serverMAC)
} else {
clientCipher = hs.suite.aead(clientKey, clientIV)
serverCipher = hs.suite.aead(serverKey, serverIV)
}
c.in.prepareCipherSpec(c.vers, clientCipher, clientHash)
c.out.prepareCipherSpec(c.vers, serverCipher, serverHash)
return nil
}
func (hs *serverHandshakeState) readFinished(out []byte) error {
c := hs.c
if err := c.readChangeCipherSpec(); err != nil {
return err
}
msg, err := c.readHandshake()
if err != nil {
return err
}
clientFinished, ok := msg.(*finishedMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(clientFinished, msg)
}
verify := hs.finishedHash.clientSum(hs.masterSecret)
if len(verify) != len(clientFinished.verifyData) ||
subtle.ConstantTimeCompare(verify, clientFinished.verifyData) != 1 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: client's Finished message is incorrect")
}
hs.finishedHash.Write(clientFinished.marshal())
copy(out, verify)
return nil
}
func (hs *serverHandshakeState) sendSessionTicket() error {
// ticketSupported is set in a resumption handshake if the
// ticket from the client was encrypted with an old session
// ticket key and thus a refreshed ticket should be sent.
if !hs.hello.ticketSupported {
return nil
}
c := hs.c
m := new(newSessionTicketMsg)
createdAt := uint64(c.config.time().Unix())
if hs.sessionState != nil {
// If this is re-wrapping an old key, then keep
// the original time it was created.
createdAt = hs.sessionState.createdAt
}
var certsFromClient [][]byte
for _, cert := range c.peerCertificates {
certsFromClient = append(certsFromClient, cert.Raw)
}
state := sessionState{
vers: c.vers,
cipherSuite: hs.suite.id,
createdAt: createdAt,
masterSecret: hs.masterSecret,
certificates: certsFromClient,
}
var err error
m.ticket, err = c.encryptTicket(state.marshal())
if err != nil {
return err
}
hs.finishedHash.Write(m.marshal())
if _, err := c.writeRecord(recordTypeHandshake, m.marshal()); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeState) sendFinished(out []byte) error {
c := hs.c
if _, err := c.writeRecord(recordTypeChangeCipherSpec, []byte{1}); err != nil {
return err
}
finished := new(finishedMsg)
finished.verifyData = hs.finishedHash.serverSum(hs.masterSecret)
hs.finishedHash.Write(finished.marshal())
if _, err := c.writeRecord(recordTypeHandshake, finished.marshal()); err != nil {
return err
}
copy(out, finished.verifyData)
return nil
}
// processCertsFromClient takes a chain of client certificates either from a
// Certificates message or from a sessionState and verifies them. It returns
// the public key of the leaf certificate.
func (c *Conn) processCertsFromClient(certificate Certificate) error {
certificates := certificate.Certificate
certs := make([]*x509.Certificate, len(certificates))
var err error
for i, asn1Data := range certificates {
if certs[i], err = x509.ParseCertificate(asn1Data); err != nil {
c.sendAlert(alertBadCertificate)
return errors.New("tls: failed to parse client certificate: " + err.Error())
}
}
if len(certs) == 0 && requiresClientCert(c.config.ClientAuth) {
c.sendAlert(alertBadCertificate)
return errors.New("tls: client didn't provide a certificate")
}
if c.config.ClientAuth >= VerifyClientCertIfGiven && len(certs) > 0 {
opts := x509.VerifyOptions{
Roots: c.config.ClientCAs,
CurrentTime: c.config.time(),
Intermediates: x509.NewCertPool(),
KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
}
for _, cert := range certs[1:] {
opts.Intermediates.AddCert(cert)
}
chains, err := certs[0].Verify(opts)
if err != nil {
c.sendAlert(alertBadCertificate)
return &CertificateVerificationError{UnverifiedCertificates: certs, Err: err}
}
c.verifiedChains = chains
}
c.peerCertificates = certs
c.ocspResponse = certificate.OCSPStaple
c.scts = certificate.SignedCertificateTimestamps
if len(certs) > 0 {
switch certs[0].PublicKey.(type) {
case *ecdsa.PublicKey, *rsa.PublicKey, ed25519.PublicKey:
default:
c.sendAlert(alertUnsupportedCertificate)
return fmt.Errorf("tls: client certificate contains an unsupported public key of type %T", certs[0].PublicKey)
}
}
if c.config.VerifyPeerCertificate != nil {
if err := c.config.VerifyPeerCertificate(certificates, c.verifiedChains); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
return nil
}
func clientHelloInfo(ctx context.Context, c *Conn, clientHello *clientHelloMsg) *ClientHelloInfo {
supportedVersions := clientHello.supportedVersions
if len(clientHello.supportedVersions) == 0 {
supportedVersions = supportedVersionsFromMax(clientHello.vers)
}
return &ClientHelloInfo{
CipherSuites: clientHello.cipherSuites,
ServerName: clientHello.serverName,
SupportedCurves: clientHello.supportedCurves,
SupportedPoints: clientHello.supportedPoints,
SignatureSchemes: clientHello.supportedSignatureAlgorithms,
SupportedProtos: clientHello.alpnProtocols,
SupportedVersions: supportedVersions,
Conn: c.conn,
config: c.config,
ctx: ctx,
}
}

880
transport/shadowtls/tls/handshake_server_tls13.go Normal file
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@ -0,0 +1,880 @@
// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"bytes"
"context"
"crypto"
"crypto/hmac"
"crypto/rsa"
"encoding/binary"
"errors"
"hash"
"io"
"time"
)
// maxClientPSKIdentities is the number of client PSK identities the server will
// attempt to validate. It will ignore the rest not to let cheap ClientHello
// messages cause too much work in session ticket decryption attempts.
const maxClientPSKIdentities = 5
type serverHandshakeStateTLS13 struct {
c *Conn
ctx context.Context
clientHello *clientHelloMsg
hello *serverHelloMsg
sentDummyCCS bool
usingPSK bool
suite *cipherSuiteTLS13
cert *Certificate
sigAlg SignatureScheme
earlySecret []byte
sharedKey []byte
handshakeSecret []byte
masterSecret []byte
trafficSecret []byte // client_application_traffic_secret_0
transcript hash.Hash
clientFinished []byte
}
func (hs *serverHandshakeStateTLS13) handshake() error {
c := hs.c
if needFIPS() {
return errors.New("tls: internal error: TLS 1.3 reached in FIPS mode")
}
// For an overview of the TLS 1.3 handshake, see RFC 8446, Section 2.
if err := hs.processClientHello(); err != nil {
return err
}
if err := hs.checkForResumption(); err != nil {
return err
}
if err := hs.pickCertificate(); err != nil {
return err
}
c.buffering = true
if err := hs.sendServerParameters(); err != nil {
return err
}
if err := hs.sendServerCertificate(); err != nil {
return err
}
if err := hs.sendServerFinished(); err != nil {
return err
}
// Note that at this point we could start sending application data without
// waiting for the client's second flight, but the application might not
// expect the lack of replay protection of the ClientHello parameters.
if _, err := c.flush(); err != nil {
return err
}
if err := hs.readClientCertificate(); err != nil {
return err
}
if err := hs.readClientFinished(); err != nil {
return err
}
c.isHandshakeComplete.Store(true)
return nil
}
func (hs *serverHandshakeStateTLS13) processClientHello() error {
c := hs.c
hs.hello = new(serverHelloMsg)
// TLS 1.3 froze the ServerHello.legacy_version field, and uses
// supported_versions instead. See RFC 8446, sections 4.1.3 and 4.2.1.
hs.hello.vers = VersionTLS12
hs.hello.supportedVersion = c.vers
if len(hs.clientHello.supportedVersions) == 0 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client used the legacy version field to negotiate TLS 1.3")
}
// Abort if the client is doing a fallback and landing lower than what we
// support. See RFC 7507, which however does not specify the interaction
// with supported_versions. The only difference is that with
// supported_versions a client has a chance to attempt a [TLS 1.2, TLS 1.4]
// handshake in case TLS 1.3 is broken but 1.2 is not. Alas, in that case,
// it will have to drop the TLS_FALLBACK_SCSV protection if it falls back to
// TLS 1.2, because a TLS 1.3 server would abort here. The situation before
// supported_versions was not better because there was just no way to do a
// TLS 1.4 handshake without risking the server selecting TLS 1.3.
for _, id := range hs.clientHello.cipherSuites {
if id == TLS_FALLBACK_SCSV {
// Use c.vers instead of max(supported_versions) because an attacker
// could defeat this by adding an arbitrary high version otherwise.
if c.vers < c.config.maxSupportedVersion(roleServer) {
c.sendAlert(alertInappropriateFallback)
return errors.New("tls: client using inappropriate protocol fallback")
}
break
}
}
if len(hs.clientHello.compressionMethods) != 1 ||
hs.clientHello.compressionMethods[0] != compressionNone {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: TLS 1.3 client supports illegal compression methods")
}
hs.hello.random = make([]byte, 32)
if _, err := io.ReadFull(c.config.rand(), hs.hello.random); err != nil {
c.sendAlert(alertInternalError)
return err
}
if len(hs.clientHello.secureRenegotiation) != 0 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: initial handshake had non-empty renegotiation extension")
}
if hs.clientHello.earlyData {
// See RFC 8446, Section 4.2.10 for the complicated behavior required
// here. The scenario is that a different server at our address offered
// to accept early data in the past, which we can't handle. For now, all
// 0-RTT enabled session tickets need to expire before a Go server can
// replace a server or join a pool. That's the same requirement that
// applies to mixing or replacing with any TLS 1.2 server.
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: client sent unexpected early data")
}
hs.hello.sessionId = hs.clientHello.sessionId
hs.hello.compressionMethod = compressionNone
preferenceList := defaultCipherSuitesTLS13
if !hasAESGCMHardwareSupport || !aesgcmPreferred(hs.clientHello.cipherSuites) {
preferenceList = defaultCipherSuitesTLS13NoAES
}
for _, suiteID := range preferenceList {
hs.suite = mutualCipherSuiteTLS13(hs.clientHello.cipherSuites, suiteID)
if hs.suite != nil {
break
}
}
if hs.suite == nil {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: no cipher suite supported by both client and server")
}
c.cipherSuite = hs.suite.id
hs.hello.cipherSuite = hs.suite.id
hs.transcript = hs.suite.hash.New()
// Pick the ECDHE group in server preference order, but give priority to
// groups with a key share, to avoid a HelloRetryRequest round-trip.
var selectedGroup CurveID
var clientKeyShare *keyShare
GroupSelection:
for _, preferredGroup := range c.config.curvePreferences() {
for _, ks := range hs.clientHello.keyShares {
if ks.group == preferredGroup {
selectedGroup = ks.group
clientKeyShare = &ks
break GroupSelection
}
}
if selectedGroup != 0 {
continue
}
for _, group := range hs.clientHello.supportedCurves {
if group == preferredGroup {
selectedGroup = group
break
}
}
}
if selectedGroup == 0 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: no ECDHE curve supported by both client and server")
}
if clientKeyShare == nil {
if err := hs.doHelloRetryRequest(selectedGroup); err != nil {
return err
}
clientKeyShare = &hs.clientHello.keyShares[0]
}
if _, ok := curveForCurveID(selectedGroup); !ok {
c.sendAlert(alertInternalError)
return errors.New("tls: CurvePreferences includes unsupported curve")
}
key, err := generateECDHEKey(c.config.rand(), selectedGroup)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
hs.hello.serverShare = keyShare{group: selectedGroup, data: key.PublicKey().Bytes()}
peerKey, err := key.Curve().NewPublicKey(clientKeyShare.data)
if err != nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid client key share")
}
hs.sharedKey, err = key.ECDH(peerKey)
if err != nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid client key share")
}
c.serverName = hs.clientHello.serverName
return nil
}
func (hs *serverHandshakeStateTLS13) checkForResumption() error {
c := hs.c
if c.config.SessionTicketsDisabled {
return nil
}
modeOK := false
for _, mode := range hs.clientHello.pskModes {
if mode == pskModeDHE {
modeOK = true
break
}
}
if !modeOK {
return nil
}
if len(hs.clientHello.pskIdentities) != len(hs.clientHello.pskBinders) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid or missing PSK binders")
}
if len(hs.clientHello.pskIdentities) == 0 {
return nil
}
for i, identity := range hs.clientHello.pskIdentities {
if i >= maxClientPSKIdentities {
break
}
plaintext, _ := c.decryptTicket(identity.label)
if plaintext == nil {
continue
}
sessionState := new(sessionStateTLS13)
if ok := sessionState.unmarshal(plaintext); !ok {
continue
}
createdAt := time.Unix(int64(sessionState.createdAt), 0)
if c.config.time().Sub(createdAt) > maxSessionTicketLifetime {
continue
}
// We don't check the obfuscated ticket age because it's affected by
// clock skew and it's only a freshness signal useful for shrinking the
// window for replay attacks, which don't affect us as we don't do 0-RTT.
pskSuite := cipherSuiteTLS13ByID(sessionState.cipherSuite)
if pskSuite == nil || pskSuite.hash != hs.suite.hash {
continue
}
// PSK connections don't re-establish client certificates, but carry
// them over in the session ticket. Ensure the presence of client certs
// in the ticket is consistent with the configured requirements.
sessionHasClientCerts := len(sessionState.certificate.Certificate) != 0
needClientCerts := requiresClientCert(c.config.ClientAuth)
if needClientCerts && !sessionHasClientCerts {
continue
}
if sessionHasClientCerts && c.config.ClientAuth == NoClientCert {
continue
}
psk := hs.suite.expandLabel(sessionState.resumptionSecret, "resumption",
nil, hs.suite.hash.Size())
hs.earlySecret = hs.suite.extract(psk, nil)
binderKey := hs.suite.deriveSecret(hs.earlySecret, resumptionBinderLabel, nil)
// Clone the transcript in case a HelloRetryRequest was recorded.
transcript := cloneHash(hs.transcript, hs.suite.hash)
if transcript == nil {
c.sendAlert(alertInternalError)
return errors.New("tls: internal error: failed to clone hash")
}
transcript.Write(hs.clientHello.marshalWithoutBinders())
pskBinder := hs.suite.finishedHash(binderKey, transcript)
if !hmac.Equal(hs.clientHello.pskBinders[i], pskBinder) {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid PSK binder")
}
c.didResume = true
if err := c.processCertsFromClient(sessionState.certificate); err != nil {
return err
}
hs.hello.selectedIdentityPresent = true
hs.hello.selectedIdentity = uint16(i)
hs.usingPSK = true
return nil
}
return nil
}
// cloneHash uses the encoding.BinaryMarshaler and encoding.BinaryUnmarshaler
// interfaces implemented by standard library hashes to clone the state of in
// to a new instance of h. It returns nil if the operation fails.
func cloneHash(in hash.Hash, h crypto.Hash) hash.Hash {
// Recreate the interface to avoid importing encoding.
type binaryMarshaler interface {
MarshalBinary() (data []byte, err error)
UnmarshalBinary(data []byte) error
}
marshaler, ok := in.(binaryMarshaler)
if !ok {
return nil
}
state, err := marshaler.MarshalBinary()
if err != nil {
return nil
}
out := h.New()
unmarshaler, ok := out.(binaryMarshaler)
if !ok {
return nil
}
if err := unmarshaler.UnmarshalBinary(state); err != nil {
return nil
}
return out
}
func (hs *serverHandshakeStateTLS13) pickCertificate() error {
c := hs.c
// Only one of PSK and certificates are used at a time.
if hs.usingPSK {
return nil
}
// signature_algorithms is required in TLS 1.3. See RFC 8446, Section 4.2.3.
if len(hs.clientHello.supportedSignatureAlgorithms) == 0 {
return c.sendAlert(alertMissingExtension)
}
certificate, err := c.config.getCertificate(clientHelloInfo(hs.ctx, c, hs.clientHello))
if err != nil {
if err == errNoCertificates {
c.sendAlert(alertUnrecognizedName)
} else {
c.sendAlert(alertInternalError)
}
return err
}
hs.sigAlg, err = selectSignatureScheme(c.vers, certificate, hs.clientHello.supportedSignatureAlgorithms)
if err != nil {
// getCertificate returned a certificate that is unsupported or
// incompatible with the client's signature algorithms.
c.sendAlert(alertHandshakeFailure)
return err
}
hs.cert = certificate
return nil
}
// sendDummyChangeCipherSpec sends a ChangeCipherSpec record for compatibility
// with middleboxes that didn't implement TLS correctly. See RFC 8446, Appendix D.4.
func (hs *serverHandshakeStateTLS13) sendDummyChangeCipherSpec() error {
if hs.sentDummyCCS {
return nil
}
hs.sentDummyCCS = true
_, err := hs.c.writeRecord(recordTypeChangeCipherSpec, []byte{1})
return err
}
func (hs *serverHandshakeStateTLS13) doHelloRetryRequest(selectedGroup CurveID) error {
c := hs.c
// The first ClientHello gets double-hashed into the transcript upon a
// HelloRetryRequest. See RFC 8446, Section 4.4.1.
hs.transcript.Write(hs.clientHello.marshal())
chHash := hs.transcript.Sum(nil)
hs.transcript.Reset()
hs.transcript.Write([]byte{typeMessageHash, 0, 0, uint8(len(chHash))})
hs.transcript.Write(chHash)
helloRetryRequest := &serverHelloMsg{
vers: hs.hello.vers,
random: helloRetryRequestRandom,
sessionId: hs.hello.sessionId,
cipherSuite: hs.hello.cipherSuite,
compressionMethod: hs.hello.compressionMethod,
supportedVersion: hs.hello.supportedVersion,
selectedGroup: selectedGroup,
}
hs.transcript.Write(helloRetryRequest.marshal())
if _, err := c.writeRecord(recordTypeHandshake, helloRetryRequest.marshal()); err != nil {
return err
}
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
msg, err := c.readHandshake()
if err != nil {
return err
}
clientHello, ok := msg.(*clientHelloMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(clientHello, msg)
}
if len(clientHello.keyShares) != 1 || clientHello.keyShares[0].group != selectedGroup {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client sent invalid key share in second ClientHello")
}
if clientHello.earlyData {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client indicated early data in second ClientHello")
}
if illegalClientHelloChange(clientHello, hs.clientHello) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client illegally modified second ClientHello")
}
hs.clientHello = clientHello
return nil
}
// illegalClientHelloChange reports whether the two ClientHello messages are
// different, with the exception of the changes allowed before and after a
// HelloRetryRequest. See RFC 8446, Section 4.1.2.
func illegalClientHelloChange(ch, ch1 *clientHelloMsg) bool {
if len(ch.supportedVersions) != len(ch1.supportedVersions) ||
len(ch.cipherSuites) != len(ch1.cipherSuites) ||
len(ch.supportedCurves) != len(ch1.supportedCurves) ||
len(ch.supportedSignatureAlgorithms) != len(ch1.supportedSignatureAlgorithms) ||
len(ch.supportedSignatureAlgorithmsCert) != len(ch1.supportedSignatureAlgorithmsCert) ||
len(ch.alpnProtocols) != len(ch1.alpnProtocols) {
return true
}
for i := range ch.supportedVersions {
if ch.supportedVersions[i] != ch1.supportedVersions[i] {
return true
}
}
for i := range ch.cipherSuites {
if ch.cipherSuites[i] != ch1.cipherSuites[i] {
return true
}
}
for i := range ch.supportedCurves {
if ch.supportedCurves[i] != ch1.supportedCurves[i] {
return true
}
}
for i := range ch.supportedSignatureAlgorithms {
if ch.supportedSignatureAlgorithms[i] != ch1.supportedSignatureAlgorithms[i] {
return true
}
}
for i := range ch.supportedSignatureAlgorithmsCert {
if ch.supportedSignatureAlgorithmsCert[i] != ch1.supportedSignatureAlgorithmsCert[i] {
return true
}
}
for i := range ch.alpnProtocols {
if ch.alpnProtocols[i] != ch1.alpnProtocols[i] {
return true
}
}
return ch.vers != ch1.vers ||
!bytes.Equal(ch.random, ch1.random) ||
!bytes.Equal(ch.sessionId, ch1.sessionId) ||
!bytes.Equal(ch.compressionMethods, ch1.compressionMethods) ||
ch.serverName != ch1.serverName ||
ch.ocspStapling != ch1.ocspStapling ||
!bytes.Equal(ch.supportedPoints, ch1.supportedPoints) ||
ch.ticketSupported != ch1.ticketSupported ||
!bytes.Equal(ch.sessionTicket, ch1.sessionTicket) ||
ch.secureRenegotiationSupported != ch1.secureRenegotiationSupported ||
!bytes.Equal(ch.secureRenegotiation, ch1.secureRenegotiation) ||
ch.scts != ch1.scts ||
!bytes.Equal(ch.cookie, ch1.cookie) ||
!bytes.Equal(ch.pskModes, ch1.pskModes)
}
func (hs *serverHandshakeStateTLS13) sendServerParameters() error {
c := hs.c
hs.transcript.Write(hs.clientHello.marshal())
hs.transcript.Write(hs.hello.marshal())
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
return err
}
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
earlySecret := hs.earlySecret
if earlySecret == nil {
earlySecret = hs.suite.extract(nil, nil)
}
hs.handshakeSecret = hs.suite.extract(hs.sharedKey,
hs.suite.deriveSecret(earlySecret, "derived", nil))
clientSecret := hs.suite.deriveSecret(hs.handshakeSecret,
clientHandshakeTrafficLabel, hs.transcript)
c.in.setTrafficSecret(hs.suite, clientSecret)
serverSecret := hs.suite.deriveSecret(hs.handshakeSecret,
serverHandshakeTrafficLabel, hs.transcript)
c.out.setTrafficSecret(hs.suite, serverSecret)
err := c.config.writeKeyLog(keyLogLabelClientHandshake, hs.clientHello.random, clientSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerHandshake, hs.clientHello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
encryptedExtensions := new(encryptedExtensionsMsg)
selectedProto, err := negotiateALPN(c.config.NextProtos, hs.clientHello.alpnProtocols)
if err != nil {
c.sendAlert(alertNoApplicationProtocol)
return err
}
encryptedExtensions.alpnProtocol = selectedProto
c.clientProtocol = selectedProto
hs.transcript.Write(encryptedExtensions.marshal())
if _, err := c.writeRecord(recordTypeHandshake, encryptedExtensions.marshal()); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) requestClientCert() bool {
return hs.c.config.ClientAuth >= RequestClientCert && !hs.usingPSK
}
func (hs *serverHandshakeStateTLS13) sendServerCertificate() error {
c := hs.c
// Only one of PSK and certificates are used at a time.
if hs.usingPSK {
return nil
}
if hs.requestClientCert() {
// Request a client certificate
certReq := new(certificateRequestMsgTLS13)
certReq.ocspStapling = true
certReq.scts = true
certReq.supportedSignatureAlgorithms = supportedSignatureAlgorithms()
if c.config.ClientCAs != nil {
certReq.certificateAuthorities = c.config.ClientCAs.Subjects()
}
hs.transcript.Write(certReq.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certReq.marshal()); err != nil {
return err
}
}
certMsg := new(certificateMsgTLS13)
certMsg.certificate = *hs.cert
certMsg.scts = hs.clientHello.scts && len(hs.cert.SignedCertificateTimestamps) > 0
certMsg.ocspStapling = hs.clientHello.ocspStapling && len(hs.cert.OCSPStaple) > 0
hs.transcript.Write(certMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certMsg.marshal()); err != nil {
return err
}
certVerifyMsg := new(certificateVerifyMsg)
certVerifyMsg.hasSignatureAlgorithm = true
certVerifyMsg.signatureAlgorithm = hs.sigAlg
sigType, sigHash, err := typeAndHashFromSignatureScheme(hs.sigAlg)
if err != nil {
return c.sendAlert(alertInternalError)
}
signed := signedMessage(sigHash, serverSignatureContext, hs.transcript)
signOpts := crypto.SignerOpts(sigHash)
if sigType == signatureRSAPSS {
signOpts = &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash, Hash: sigHash}
}
sig, err := hs.cert.PrivateKey.(crypto.Signer).Sign(c.config.rand(), signed, signOpts)
if err != nil {
public := hs.cert.PrivateKey.(crypto.Signer).Public()
if rsaKey, ok := public.(*rsa.PublicKey); ok && sigType == signatureRSAPSS &&
rsaKey.N.BitLen()/8 < sigHash.Size()*2+2 { // key too small for RSA-PSS
c.sendAlert(alertHandshakeFailure)
} else {
c.sendAlert(alertInternalError)
}
return errors.New("tls: failed to sign handshake: " + err.Error())
}
certVerifyMsg.signature = sig
hs.transcript.Write(certVerifyMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certVerifyMsg.marshal()); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) sendServerFinished() error {
c := hs.c
finished := &finishedMsg{
verifyData: hs.suite.finishedHash(c.out.trafficSecret, hs.transcript),
}
hs.transcript.Write(finished.marshal())
if _, err := c.writeRecord(recordTypeHandshake, finished.marshal()); err != nil {
return err
}
// Derive secrets that take context through the server Finished.
hs.masterSecret = hs.suite.extract(nil,
hs.suite.deriveSecret(hs.handshakeSecret, "derived", nil))
hs.trafficSecret = hs.suite.deriveSecret(hs.masterSecret,
clientApplicationTrafficLabel, hs.transcript)
serverSecret := hs.suite.deriveSecret(hs.masterSecret,
serverApplicationTrafficLabel, hs.transcript)
c.out.setTrafficSecret(hs.suite, serverSecret)
err := c.config.writeKeyLog(keyLogLabelClientTraffic, hs.clientHello.random, hs.trafficSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerTraffic, hs.clientHello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
c.ekm = hs.suite.exportKeyingMaterial(hs.masterSecret, hs.transcript)
// If we did not request client certificates, at this point we can
// precompute the client finished and roll the transcript forward to send
// session tickets in our first flight.
if !hs.requestClientCert() {
if err := hs.sendSessionTickets(); err != nil {
return err
}
}
return nil
}
func (hs *serverHandshakeStateTLS13) shouldSendSessionTickets() bool {
if hs.c.config.SessionTicketsDisabled {
return false
}
// Don't send tickets the client wouldn't use. See RFC 8446, Section 4.2.9.
for _, pskMode := range hs.clientHello.pskModes {
if pskMode == pskModeDHE {
return true
}
}
return false
}
func (hs *serverHandshakeStateTLS13) sendSessionTickets() error {
c := hs.c
hs.clientFinished = hs.suite.finishedHash(c.in.trafficSecret, hs.transcript)
finishedMsg := &finishedMsg{
verifyData: hs.clientFinished,
}
hs.transcript.Write(finishedMsg.marshal())
if !hs.shouldSendSessionTickets() {
return nil
}
resumptionSecret := hs.suite.deriveSecret(hs.masterSecret,
resumptionLabel, hs.transcript)
m := new(newSessionTicketMsgTLS13)
var certsFromClient [][]byte
for _, cert := range c.peerCertificates {
certsFromClient = append(certsFromClient, cert.Raw)
}
state := sessionStateTLS13{
cipherSuite: hs.suite.id,
createdAt: uint64(c.config.time().Unix()),
resumptionSecret: resumptionSecret,
certificate: Certificate{
Certificate: certsFromClient,
OCSPStaple: c.ocspResponse,
SignedCertificateTimestamps: c.scts,
},
}
var err error
m.label, err = c.encryptTicket(state.marshal())
if err != nil {
return err
}
m.lifetime = uint32(maxSessionTicketLifetime / time.Second)
// ticket_age_add is a random 32-bit value. See RFC 8446, section 4.6.1
// The value is not stored anywhere; we never need to check the ticket age
// because 0-RTT is not supported.
ageAdd := make([]byte, 4)
_, err = hs.c.config.rand().Read(ageAdd)
if err != nil {
return err
}
m.ageAdd = binary.LittleEndian.Uint32(ageAdd)
// ticket_nonce, which must be unique per connection, is always left at
// zero because we only ever send one ticket per connection.
if _, err := c.writeRecord(recordTypeHandshake, m.marshal()); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) readClientCertificate() error {
c := hs.c
if !hs.requestClientCert() {
// Make sure the connection is still being verified whether or not
// the server requested a client certificate.
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
return nil
}
// If we requested a client certificate, then the client must send a
// certificate message. If it's empty, no CertificateVerify is sent.
msg, err := c.readHandshake()
if err != nil {
return err
}
certMsg, ok := msg.(*certificateMsgTLS13)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certMsg, msg)
}
hs.transcript.Write(certMsg.marshal())
if err := c.processCertsFromClient(certMsg.certificate); err != nil {
return err
}
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
if len(certMsg.certificate.Certificate) != 0 {
msg, err = c.readHandshake()
if err != nil {
return err
}
certVerify, ok := msg.(*certificateVerifyMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certVerify, msg)
}
// See RFC 8446, Section 4.4.3.
if !isSupportedSignatureAlgorithm(certVerify.signatureAlgorithm, supportedSignatureAlgorithms()) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client certificate used with invalid signature algorithm")
}
sigType, sigHash, err := typeAndHashFromSignatureScheme(certVerify.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
if sigType == signaturePKCS1v15 || sigHash == crypto.SHA1 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client certificate used with invalid signature algorithm")
}
signed := signedMessage(sigHash, clientSignatureContext, hs.transcript)
if err := verifyHandshakeSignature(sigType, c.peerCertificates[0].PublicKey,
sigHash, signed, certVerify.signature); err != nil {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid signature by the client certificate: " + err.Error())
}
hs.transcript.Write(certVerify.marshal())
}
// If we waited until the client certificates to send session tickets, we
// are ready to do it now.
if err := hs.sendSessionTickets(); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) readClientFinished() error {
c := hs.c
msg, err := c.readHandshake()
if err != nil {
return err
}
finished, ok := msg.(*finishedMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(finished, msg)
}
if !hmac.Equal(hs.clientFinished, finished.verifyData) {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid client finished hash")
}
c.in.setTrafficSecret(hs.suite, hs.trafficSecret)
return nil
}

369
transport/shadowtls/tls/key_agreement.go Normal file
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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto"
"crypto/md5"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"errors"
"fmt"
"io"
"crypto/ecdh"
)
// a keyAgreement implements the client and server side of a TLS key agreement
// protocol by generating and processing key exchange messages.
type keyAgreement interface {
// On the server side, the first two methods are called in order.
// In the case that the key agreement protocol doesn't use a
// ServerKeyExchange message, generateServerKeyExchange can return nil,
// nil.
generateServerKeyExchange(*Config, *Certificate, *clientHelloMsg, *serverHelloMsg) (*serverKeyExchangeMsg, error)
processClientKeyExchange(*Config, *Certificate, *clientKeyExchangeMsg, uint16) ([]byte, error)
// On the client side, the next two methods are called in order.
// This method may not be called if the server doesn't send a
// ServerKeyExchange message.
processServerKeyExchange(*Config, *clientHelloMsg, *serverHelloMsg, *x509.Certificate, *serverKeyExchangeMsg) error
generateClientKeyExchange(*Config, *clientHelloMsg, *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error)
}
var (
errClientKeyExchange = errors.New("tls: invalid ClientKeyExchange message")
errServerKeyExchange = errors.New("tls: invalid ServerKeyExchange message")
)
// rsaKeyAgreement implements the standard TLS key agreement where the client
// encrypts the pre-master secret to the server's public key.
type rsaKeyAgreement struct{}
func (ka rsaKeyAgreement) generateServerKeyExchange(config *Config, cert *Certificate, clientHello *clientHelloMsg, hello *serverHelloMsg) (*serverKeyExchangeMsg, error) {
return nil, nil
}
func (ka rsaKeyAgreement) processClientKeyExchange(config *Config, cert *Certificate, ckx *clientKeyExchangeMsg, version uint16) ([]byte, error) {
if len(ckx.ciphertext) < 2 {
return nil, errClientKeyExchange
}
ciphertextLen := int(ckx.ciphertext[0])<<8 | int(ckx.ciphertext[1])
if ciphertextLen != len(ckx.ciphertext)-2 {
return nil, errClientKeyExchange
}
ciphertext := ckx.ciphertext[2:]
priv, ok := cert.PrivateKey.(crypto.Decrypter)
if !ok {
return nil, errors.New("tls: certificate private key does not implement crypto.Decrypter")
}
// Perform constant time RSA PKCS #1 v1.5 decryption
preMasterSecret, err := priv.Decrypt(config.rand(), ciphertext, &rsa.PKCS1v15DecryptOptions{SessionKeyLen: 48})
if err != nil {
return nil, err
}
// We don't check the version number in the premaster secret. For one,
// by checking it, we would leak information about the validity of the
// encrypted pre-master secret. Secondly, it provides only a small
// benefit against a downgrade attack and some implementations send the
// wrong version anyway. See the discussion at the end of section
// 7.4.7.1 of RFC 4346.
return preMasterSecret, nil
}
func (ka rsaKeyAgreement) processServerKeyExchange(config *Config, clientHello *clientHelloMsg, serverHello *serverHelloMsg, cert *x509.Certificate, skx *serverKeyExchangeMsg) error {
return errors.New("tls: unexpected ServerKeyExchange")
}
func (ka rsaKeyAgreement) generateClientKeyExchange(config *Config, clientHello *clientHelloMsg, cert *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error) {
preMasterSecret := make([]byte, 48)
preMasterSecret[0] = byte(clientHello.vers >> 8)
preMasterSecret[1] = byte(clientHello.vers)
_, err := io.ReadFull(config.rand(), preMasterSecret[2:])
if err != nil {
return nil, nil, err
}
rsaKey, ok := cert.PublicKey.(*rsa.PublicKey)
if !ok {
return nil, nil, errors.New("tls: server certificate contains incorrect key type for selected ciphersuite")
}
encrypted, err := rsa.EncryptPKCS1v15(config.rand(), rsaKey, preMasterSecret)
if err != nil {
return nil, nil, err
}
ckx := new(clientKeyExchangeMsg)
ckx.ciphertext = make([]byte, len(encrypted)+2)
ckx.ciphertext[0] = byte(len(encrypted) >> 8)
ckx.ciphertext[1] = byte(len(encrypted))
copy(ckx.ciphertext[2:], encrypted)
return preMasterSecret, ckx, nil
}
// sha1Hash calculates a SHA1 hash over the given byte slices.
func sha1Hash(slices [][]byte) []byte {
hsha1 := sha1.New()
for _, slice := range slices {
hsha1.Write(slice)
}
return hsha1.Sum(nil)
}
// md5SHA1Hash implements TLS 1.0's hybrid hash function which consists of the
// concatenation of an MD5 and SHA1 hash.
func md5SHA1Hash(slices [][]byte) []byte {
md5sha1 := make([]byte, md5.Size+sha1.Size)
hmd5 := md5.New()
for _, slice := range slices {
hmd5.Write(slice)
}
copy(md5sha1, hmd5.Sum(nil))
copy(md5sha1[md5.Size:], sha1Hash(slices))
return md5sha1
}
// hashForServerKeyExchange hashes the given slices and returns their digest
// using the given hash function (for >= TLS 1.2) or using a default based on
// the sigType (for earlier TLS versions). For Ed25519 signatures, which don't
// do pre-hashing, it returns the concatenation of the slices.
func hashForServerKeyExchange(sigType uint8, hashFunc crypto.Hash, version uint16, slices ...[]byte) []byte {
if sigType == signatureEd25519 {
var signed []byte
for _, slice := range slices {
signed = append(signed, slice...)
}
return signed
}
if version >= VersionTLS12 {
h := hashFunc.New()
for _, slice := range slices {
h.Write(slice)
}
digest := h.Sum(nil)
return digest
}
if sigType == signatureECDSA {
return sha1Hash(slices)
}
return md5SHA1Hash(slices)
}
// ecdheKeyAgreement implements a TLS key agreement where the server
// generates an ephemeral EC public/private key pair and signs it. The
// pre-master secret is then calculated using ECDH. The signature may
// be ECDSA, Ed25519 or RSA.
type ecdheKeyAgreement struct {
version uint16
isRSA bool
key *ecdh.PrivateKey
// ckx and preMasterSecret are generated in processServerKeyExchange
// and returned in generateClientKeyExchange.
ckx *clientKeyExchangeMsg
preMasterSecret []byte
}
func (ka *ecdheKeyAgreement) generateServerKeyExchange(config *Config, cert *Certificate, clientHello *clientHelloMsg, hello *serverHelloMsg) (*serverKeyExchangeMsg, error) {
var curveID CurveID
for _, c := range clientHello.supportedCurves {
if config.supportsCurve(c) {
curveID = c
break
}
}
if curveID == 0 {
return nil, errors.New("tls: no supported elliptic curves offered")
}
if _, ok := curveForCurveID(curveID); !ok {
return nil, errors.New("tls: CurvePreferences includes unsupported curve")
}
key, err := generateECDHEKey(config.rand(), curveID)
if err != nil {
return nil, err
}
ka.key = key
// See RFC 4492, Section 5.4.
ecdhePublic := key.PublicKey().Bytes()
serverECDHEParams := make([]byte, 1+2+1+len(ecdhePublic))
serverECDHEParams[0] = 3 // named curve
serverECDHEParams[1] = byte(curveID >> 8)
serverECDHEParams[2] = byte(curveID)
serverECDHEParams[3] = byte(len(ecdhePublic))
copy(serverECDHEParams[4:], ecdhePublic)
priv, ok := cert.PrivateKey.(crypto.Signer)
if !ok {
return nil, fmt.Errorf("tls: certificate private key of type %T does not implement crypto.Signer", cert.PrivateKey)
}
var signatureAlgorithm SignatureScheme
var sigType uint8
var sigHash crypto.Hash
if ka.version >= VersionTLS12 {
signatureAlgorithm, err = selectSignatureScheme(ka.version, cert, clientHello.supportedSignatureAlgorithms)
if err != nil {
return nil, err
}
sigType, sigHash, err = typeAndHashFromSignatureScheme(signatureAlgorithm)
if err != nil {
return nil, err
}
} else {
sigType, sigHash, err = legacyTypeAndHashFromPublicKey(priv.Public())
if err != nil {
return nil, err
}
}
if (sigType == signaturePKCS1v15 || sigType == signatureRSAPSS) != ka.isRSA {
return nil, errors.New("tls: certificate cannot be used with the selected cipher suite")
}
signed := hashForServerKeyExchange(sigType, sigHash, ka.version, clientHello.random, hello.random, serverECDHEParams)
signOpts := crypto.SignerOpts(sigHash)
if sigType == signatureRSAPSS {
signOpts = &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash, Hash: sigHash}
}
sig, err := priv.Sign(config.rand(), signed, signOpts)
if err != nil {
return nil, errors.New("tls: failed to sign ECDHE parameters: " + err.Error())
}
skx := new(serverKeyExchangeMsg)
sigAndHashLen := 0
if ka.version >= VersionTLS12 {
sigAndHashLen = 2
}
skx.key = make([]byte, len(serverECDHEParams)+sigAndHashLen+2+len(sig))
copy(skx.key, serverECDHEParams)
k := skx.key[len(serverECDHEParams):]
if ka.version >= VersionTLS12 {
k[0] = byte(signatureAlgorithm >> 8)
k[1] = byte(signatureAlgorithm)
k = k[2:]
}
k[0] = byte(len(sig) >> 8)
k[1] = byte(len(sig))
copy(k[2:], sig)
return skx, nil
}
func (ka *ecdheKeyAgreement) processClientKeyExchange(config *Config, cert *Certificate, ckx *clientKeyExchangeMsg, version uint16) ([]byte, error) {
if len(ckx.ciphertext) == 0 || int(ckx.ciphertext[0]) != len(ckx.ciphertext)-1 {
return nil, errClientKeyExchange
}
peerKey, err := ka.key.Curve().NewPublicKey(ckx.ciphertext[1:])
if err != nil {
return nil, errClientKeyExchange
}
preMasterSecret, err := ka.key.ECDH(peerKey)
if err != nil {
return nil, errClientKeyExchange
}
return preMasterSecret, nil
}
func (ka *ecdheKeyAgreement) processServerKeyExchange(config *Config, clientHello *clientHelloMsg, serverHello *serverHelloMsg, cert *x509.Certificate, skx *serverKeyExchangeMsg) error {
if len(skx.key) < 4 {
return errServerKeyExchange
}
if skx.key[0] != 3 { // named curve
return errors.New("tls: server selected unsupported curve")
}
curveID := CurveID(skx.key[1])<<8 | CurveID(skx.key[2])
publicLen := int(skx.key[3])
if publicLen+4 > len(skx.key) {
return errServerKeyExchange
}
serverECDHEParams := skx.key[:4+publicLen]
publicKey := serverECDHEParams[4:]
sig := skx.key[4+publicLen:]
if len(sig) < 2 {
return errServerKeyExchange
}
if _, ok := curveForCurveID(curveID); !ok {
return errors.New("tls: server selected unsupported curve")
}
key, err := generateECDHEKey(config.rand(), curveID)
if err != nil {
return err
}
ka.key = key
peerKey, err := key.Curve().NewPublicKey(publicKey)
if err != nil {
return errServerKeyExchange
}
ka.preMasterSecret, err = key.ECDH(peerKey)
if err != nil {
return errServerKeyExchange
}
ourPublicKey := key.PublicKey().Bytes()
ka.ckx = new(clientKeyExchangeMsg)
ka.ckx.ciphertext = make([]byte, 1+len(ourPublicKey))
ka.ckx.ciphertext[0] = byte(len(ourPublicKey))
copy(ka.ckx.ciphertext[1:], ourPublicKey)
var sigType uint8
var sigHash crypto.Hash
if ka.version >= VersionTLS12 {
signatureAlgorithm := SignatureScheme(sig[0])<<8 | SignatureScheme(sig[1])
sig = sig[2:]
if len(sig) < 2 {
return errServerKeyExchange
}
if !isSupportedSignatureAlgorithm(signatureAlgorithm, clientHello.supportedSignatureAlgorithms) {
return errors.New("tls: certificate used with invalid signature algorithm")
}
sigType, sigHash, err = typeAndHashFromSignatureScheme(signatureAlgorithm)
if err != nil {
return err
}
} else {
sigType, sigHash, err = legacyTypeAndHashFromPublicKey(cert.PublicKey)
if err != nil {
return err
}
}
if (sigType == signaturePKCS1v15 || sigType == signatureRSAPSS) != ka.isRSA {
return errServerKeyExchange
}
sigLen := int(sig[0])<<8 | int(sig[1])
if sigLen+2 != len(sig) {
return errServerKeyExchange
}
sig = sig[2:]
signed := hashForServerKeyExchange(sigType, sigHash, ka.version, clientHello.random, serverHello.random, serverECDHEParams)
if err := verifyHandshakeSignature(sigType, cert.PublicKey, sigHash, signed, sig); err != nil {
return errors.New("tls: invalid signature by the server certificate: " + err.Error())
}
return nil
}
func (ka *ecdheKeyAgreement) generateClientKeyExchange(config *Config, clientHello *clientHelloMsg, cert *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error) {
if ka.ckx == nil {
return nil, nil, errors.New("tls: missing ServerKeyExchange message")
}
return ka.preMasterSecret, ka.ckx, nil
}

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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto/hmac"
"errors"
"hash"
"io"
"crypto/ecdh"
"golang.org/x/crypto/cryptobyte"
"golang.org/x/crypto/hkdf"
)
// This file contains the functions necessary to compute the TLS 1.3 key
// schedule. See RFC 8446, Section 7.
const (
resumptionBinderLabel = "res binder"
clientHandshakeTrafficLabel = "c hs traffic"
serverHandshakeTrafficLabel = "s hs traffic"
clientApplicationTrafficLabel = "c ap traffic"
serverApplicationTrafficLabel = "s ap traffic"
exporterLabel = "exp master"
resumptionLabel = "res master"
trafficUpdateLabel = "traffic upd"
)
// expandLabel implements HKDF-Expand-Label from RFC 8446, Section 7.1.
func (c *cipherSuiteTLS13) expandLabel(secret []byte, label string, context []byte, length int) []byte {
var hkdfLabel cryptobyte.Builder
hkdfLabel.AddUint16(uint16(length))
hkdfLabel.AddUint8LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes([]byte("tls13 "))
b.AddBytes([]byte(label))
})
hkdfLabel.AddUint8LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes(context)
})
out := make([]byte, length)
n, err := hkdf.Expand(c.hash.New, secret, hkdfLabel.BytesOrPanic()).Read(out)
if err != nil || n != length {
panic("tls: HKDF-Expand-Label invocation failed unexpectedly")
}
return out
}
// deriveSecret implements Derive-Secret from RFC 8446, Section 7.1.
func (c *cipherSuiteTLS13) deriveSecret(secret []byte, label string, transcript hash.Hash) []byte {
if transcript == nil {
transcript = c.hash.New()
}
return c.expandLabel(secret, label, transcript.Sum(nil), c.hash.Size())
}
// extract implements HKDF-Extract with the cipher suite hash.
func (c *cipherSuiteTLS13) extract(newSecret, currentSecret []byte) []byte {
if newSecret == nil {
newSecret = make([]byte, c.hash.Size())
}
return hkdf.Extract(c.hash.New, newSecret, currentSecret)
}
// nextTrafficSecret generates the next traffic secret, given the current one,
// according to RFC 8446, Section 7.2.
func (c *cipherSuiteTLS13) nextTrafficSecret(trafficSecret []byte) []byte {
return c.expandLabel(trafficSecret, trafficUpdateLabel, nil, c.hash.Size())
}
// trafficKey generates traffic keys according to RFC 8446, Section 7.3.
func (c *cipherSuiteTLS13) trafficKey(trafficSecret []byte) (key, iv []byte) {
key = c.expandLabel(trafficSecret, "key", nil, c.keyLen)
iv = c.expandLabel(trafficSecret, "iv", nil, aeadNonceLength)
return
}
// finishedHash generates the Finished verify_data or PskBinderEntry according
// to RFC 8446, Section 4.4.4. See sections 4.4 and 4.2.11.2 for the baseKey
// selection.
func (c *cipherSuiteTLS13) finishedHash(baseKey []byte, transcript hash.Hash) []byte {
finishedKey := c.expandLabel(baseKey, "finished", nil, c.hash.Size())
verifyData := hmac.New(c.hash.New, finishedKey)
verifyData.Write(transcript.Sum(nil))
return verifyData.Sum(nil)
}
// exportKeyingMaterial implements RFC5705 exporters for TLS 1.3 according to
// RFC 8446, Section 7.5.
func (c *cipherSuiteTLS13) exportKeyingMaterial(masterSecret []byte, transcript hash.Hash) func(string, []byte, int) ([]byte, error) {
expMasterSecret := c.deriveSecret(masterSecret, exporterLabel, transcript)
return func(label string, context []byte, length int) ([]byte, error) {
secret := c.deriveSecret(expMasterSecret, label, nil)
h := c.hash.New()
h.Write(context)
return c.expandLabel(secret, "exporter", h.Sum(nil), length), nil
}
}
// generateECDHEKey returns a PrivateKey that implements Diffie-Hellman
// according to RFC 8446, Section 4.2.8.2.
func generateECDHEKey(rand io.Reader, curveID CurveID) (*ecdh.PrivateKey, error) {
curve, ok := curveForCurveID(curveID)
if !ok {
return nil, errors.New("tls: internal error: unsupported curve")
}
return curve.GenerateKey(rand)
}
func curveForCurveID(id CurveID) (ecdh.Curve, bool) {
switch id {
case X25519:
return ecdh.X25519(), true
case CurveP256:
return ecdh.P256(), true
case CurveP384:
return ecdh.P384(), true
case CurveP521:
return ecdh.P521(), true
default:
return nil, false
}
}
func curveIDForCurve(curve ecdh.Curve) (CurveID, bool) {
switch curve {
case ecdh.X25519():
return X25519, true
case ecdh.P256():
return CurveP256, true
case ecdh.P384():
return CurveP384, true
case ecdh.P521():
return CurveP521, true
default:
return 0, false
}
}

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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !boringcrypto
package tls
func needFIPS() bool { return false }
func supportedSignatureAlgorithms() []SignatureScheme {
return defaultSupportedSignatureAlgorithms
}
func fipsMinVersion(c *Config) uint16 { panic("fipsMinVersion") }
func fipsMaxVersion(c *Config) uint16 { panic("fipsMaxVersion") }
func fipsCurvePreferences(c *Config) []CurveID { panic("fipsCurvePreferences") }
func fipsCipherSuites(c *Config) []uint16 { panic("fipsCipherSuites") }
var fipsSupportedSignatureAlgorithms []SignatureScheme

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto"
"crypto/hmac"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"errors"
"fmt"
"hash"
)
// Split a premaster secret in two as specified in RFC 4346, Section 5.
func splitPreMasterSecret(secret []byte) (s1, s2 []byte) {
s1 = secret[0 : (len(secret)+1)/2]
s2 = secret[len(secret)/2:]
return
}
// pHash implements the P_hash function, as defined in RFC 4346, Section 5.
func pHash(result, secret, seed []byte, hash func() hash.Hash) {
h := hmac.New(hash, secret)
h.Write(seed)
a := h.Sum(nil)
j := 0
for j < len(result) {
h.Reset()
h.Write(a)
h.Write(seed)
b := h.Sum(nil)
copy(result[j:], b)
j += len(b)
h.Reset()
h.Write(a)
a = h.Sum(nil)
}
}
// prf10 implements the TLS 1.0 pseudo-random function, as defined in RFC 2246, Section 5.
func prf10(result, secret, label, seed []byte) {
hashSHA1 := sha1.New
hashMD5 := md5.New
labelAndSeed := make([]byte, len(label)+len(seed))
copy(labelAndSeed, label)
copy(labelAndSeed[len(label):], seed)
s1, s2 := splitPreMasterSecret(secret)
pHash(result, s1, labelAndSeed, hashMD5)
result2 := make([]byte, len(result))
pHash(result2, s2, labelAndSeed, hashSHA1)
for i, b := range result2 {
result[i] ^= b
}
}
// prf12 implements the TLS 1.2 pseudo-random function, as defined in RFC 5246, Section 5.
func prf12(hashFunc func() hash.Hash) func(result, secret, label, seed []byte) {
return func(result, secret, label, seed []byte) {
labelAndSeed := make([]byte, len(label)+len(seed))
copy(labelAndSeed, label)
copy(labelAndSeed[len(label):], seed)
pHash(result, secret, labelAndSeed, hashFunc)
}
}
const (
masterSecretLength = 48 // Length of a master secret in TLS 1.1.
finishedVerifyLength = 12 // Length of verify_data in a Finished message.
)
var (
masterSecretLabel = []byte("master secret")
keyExpansionLabel = []byte("key expansion")
clientFinishedLabel = []byte("client finished")
serverFinishedLabel = []byte("server finished")
)
func prfAndHashForVersion(version uint16, suite *cipherSuite) (func(result, secret, label, seed []byte), crypto.Hash) {
switch version {
case VersionTLS10, VersionTLS11:
return prf10, crypto.Hash(0)
case VersionTLS12:
if suite.flags&suiteSHA384 != 0 {
return prf12(sha512.New384), crypto.SHA384
}
return prf12(sha256.New), crypto.SHA256
default:
panic("unknown version")
}
}
func prfForVersion(version uint16, suite *cipherSuite) func(result, secret, label, seed []byte) {
prf, _ := prfAndHashForVersion(version, suite)
return prf
}
// masterFromPreMasterSecret generates the master secret from the pre-master
// secret. See RFC 5246, Section 8.1.
func masterFromPreMasterSecret(version uint16, suite *cipherSuite, preMasterSecret, clientRandom, serverRandom []byte) []byte {
seed := make([]byte, 0, len(clientRandom)+len(serverRandom))
seed = append(seed, clientRandom...)
seed = append(seed, serverRandom...)
masterSecret := make([]byte, masterSecretLength)
prfForVersion(version, suite)(masterSecret, preMasterSecret, masterSecretLabel, seed)
return masterSecret
}
// keysFromMasterSecret generates the connection keys from the master
// secret, given the lengths of the MAC key, cipher key and IV, as defined in
// RFC 2246, Section 6.3.
func keysFromMasterSecret(version uint16, suite *cipherSuite, masterSecret, clientRandom, serverRandom []byte, macLen, keyLen, ivLen int) (clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV []byte) {
seed := make([]byte, 0, len(serverRandom)+len(clientRandom))
seed = append(seed, serverRandom...)
seed = append(seed, clientRandom...)
n := 2*macLen + 2*keyLen + 2*ivLen
keyMaterial := make([]byte, n)
prfForVersion(version, suite)(keyMaterial, masterSecret, keyExpansionLabel, seed)
clientMAC = keyMaterial[:macLen]
keyMaterial = keyMaterial[macLen:]
serverMAC = keyMaterial[:macLen]
keyMaterial = keyMaterial[macLen:]
clientKey = keyMaterial[:keyLen]
keyMaterial = keyMaterial[keyLen:]
serverKey = keyMaterial[:keyLen]
keyMaterial = keyMaterial[keyLen:]
clientIV = keyMaterial[:ivLen]
keyMaterial = keyMaterial[ivLen:]
serverIV = keyMaterial[:ivLen]
return
}
func newFinishedHash(version uint16, cipherSuite *cipherSuite) finishedHash {
var buffer []byte
if version >= VersionTLS12 {
buffer = []byte{}
}
prf, hash := prfAndHashForVersion(version, cipherSuite)
if hash != 0 {
return finishedHash{hash.New(), hash.New(), nil, nil, buffer, version, prf}
}
return finishedHash{sha1.New(), sha1.New(), md5.New(), md5.New(), buffer, version, prf}
}
// A finishedHash calculates the hash of a set of handshake messages suitable
// for including in a Finished message.
type finishedHash struct {
client hash.Hash
server hash.Hash
// Prior to TLS 1.2, an additional MD5 hash is required.
clientMD5 hash.Hash
serverMD5 hash.Hash
// In TLS 1.2, a full buffer is sadly required.
buffer []byte
version uint16
prf func(result, secret, label, seed []byte)
}
func (h *finishedHash) Write(msg []byte) (n int, err error) {
h.client.Write(msg)
h.server.Write(msg)
if h.version < VersionTLS12 {
h.clientMD5.Write(msg)
h.serverMD5.Write(msg)
}
if h.buffer != nil {
h.buffer = append(h.buffer, msg...)
}
return len(msg), nil
}
func (h finishedHash) Sum() []byte {
if h.version >= VersionTLS12 {
return h.client.Sum(nil)
}
out := make([]byte, 0, md5.Size+sha1.Size)
out = h.clientMD5.Sum(out)
return h.client.Sum(out)
}
// clientSum returns the contents of the verify_data member of a client's
// Finished message.
func (h finishedHash) clientSum(masterSecret []byte) []byte {
out := make([]byte, finishedVerifyLength)
h.prf(out, masterSecret, clientFinishedLabel, h.Sum())
return out
}
// serverSum returns the contents of the verify_data member of a server's
// Finished message.
func (h finishedHash) serverSum(masterSecret []byte) []byte {
out := make([]byte, finishedVerifyLength)
h.prf(out, masterSecret, serverFinishedLabel, h.Sum())
return out
}
// hashForClientCertificate returns the handshake messages so far, pre-hashed if
// necessary, suitable for signing by a TLS client certificate.
func (h finishedHash) hashForClientCertificate(sigType uint8, hashAlg crypto.Hash) []byte {
if (h.version >= VersionTLS12 || sigType == signatureEd25519) && h.buffer == nil {
panic("tls: handshake hash for a client certificate requested after discarding the handshake buffer")
}
if sigType == signatureEd25519 {
return h.buffer
}
if h.version >= VersionTLS12 {
hash := hashAlg.New()
hash.Write(h.buffer)
return hash.Sum(nil)
}
if sigType == signatureECDSA {
return h.server.Sum(nil)
}
return h.Sum()
}
// discardHandshakeBuffer is called when there is no more need to
// buffer the entirety of the handshake messages.
func (h *finishedHash) discardHandshakeBuffer() {
h.buffer = nil
}
// noExportedKeyingMaterial is used as a value of
// ConnectionState.ekm when renegotiation is enabled and thus
// we wish to fail all key-material export requests.
func noExportedKeyingMaterial(label string, context []byte, length int) ([]byte, error) {
return nil, errors.New("crypto/tls: ExportKeyingMaterial is unavailable when renegotiation is enabled")
}
// ekmFromMasterSecret generates exported keying material as defined in RFC 5705.
func ekmFromMasterSecret(version uint16, suite *cipherSuite, masterSecret, clientRandom, serverRandom []byte) func(string, []byte, int) ([]byte, error) {
return func(label string, context []byte, length int) ([]byte, error) {
switch label {
case "client finished", "server finished", "master secret", "key expansion":
// These values are reserved and may not be used.
return nil, fmt.Errorf("crypto/tls: reserved ExportKeyingMaterial label: %s", label)
}
seedLen := len(serverRandom) + len(clientRandom)
if context != nil {
seedLen += 2 + len(context)
}
seed := make([]byte, 0, seedLen)
seed = append(seed, clientRandom...)
seed = append(seed, serverRandom...)
if context != nil {
if len(context) >= 1<<16 {
return nil, fmt.Errorf("crypto/tls: ExportKeyingMaterial context too long")
}
seed = append(seed, byte(len(context)>>8), byte(len(context)))
seed = append(seed, context...)
}
keyMaterial := make([]byte, length)
prfForVersion(version, suite)(keyMaterial, masterSecret, []byte(label), seed)
return keyMaterial, nil
}
}

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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/hmac"
"crypto/sha256"
"crypto/subtle"
"errors"
"io"
"golang.org/x/crypto/cryptobyte"
)
// sessionState contains the information that is serialized into a session
// ticket in order to later resume a connection.
type sessionState struct {
vers uint16
cipherSuite uint16
createdAt uint64
masterSecret []byte // opaque master_secret<1..2^16-1>;
// struct { opaque certificate<1..2^24-1> } Certificate;
certificates [][]byte // Certificate certificate_list<0..2^24-1>;
// usedOldKey is true if the ticket from which this session came from
// was encrypted with an older key and thus should be refreshed.
usedOldKey bool
}
func (m *sessionState) marshal() []byte {
var b cryptobyte.Builder
b.AddUint16(m.vers)
b.AddUint16(m.cipherSuite)
addUint64(&b, m.createdAt)
b.AddUint16LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes(m.masterSecret)
})
b.AddUint24LengthPrefixed(func(b *cryptobyte.Builder) {
for _, cert := range m.certificates {
b.AddUint24LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes(cert)
})
}
})
return b.BytesOrPanic()
}
func (m *sessionState) unmarshal(data []byte) bool {
*m = sessionState{usedOldKey: m.usedOldKey}
s := cryptobyte.String(data)
if ok := s.ReadUint16(&m.vers) &&
s.ReadUint16(&m.cipherSuite) &&
readUint64(&s, &m.createdAt) &&
readUint16LengthPrefixed(&s, &m.masterSecret) &&
len(m.masterSecret) != 0; !ok {
return false
}
var certList cryptobyte.String
if !s.ReadUint24LengthPrefixed(&certList) {
return false
}
for !certList.Empty() {
var cert []byte
if !readUint24LengthPrefixed(&certList, &cert) {
return false
}
m.certificates = append(m.certificates, cert)
}
return s.Empty()
}
// sessionStateTLS13 is the content of a TLS 1.3 session ticket. Its first
// version (revision = 0) doesn't carry any of the information needed for 0-RTT
// validation and the nonce is always empty.
type sessionStateTLS13 struct {
// uint8 version = 0x0304;
// uint8 revision = 0;
cipherSuite uint16
createdAt uint64
resumptionSecret []byte // opaque resumption_master_secret<1..2^8-1>;
certificate Certificate // CertificateEntry certificate_list<0..2^24-1>;
}
func (m *sessionStateTLS13) marshal() []byte {
var b cryptobyte.Builder
b.AddUint16(VersionTLS13)
b.AddUint8(0) // revision
b.AddUint16(m.cipherSuite)
addUint64(&b, m.createdAt)
b.AddUint8LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes(m.resumptionSecret)
})
marshalCertificate(&b, m.certificate)
return b.BytesOrPanic()
}
func (m *sessionStateTLS13) unmarshal(data []byte) bool {
*m = sessionStateTLS13{}
s := cryptobyte.String(data)
var version uint16
var revision uint8
return s.ReadUint16(&version) &&
version == VersionTLS13 &&
s.ReadUint8(&revision) &&
revision == 0 &&
s.ReadUint16(&m.cipherSuite) &&
readUint64(&s, &m.createdAt) &&
readUint8LengthPrefixed(&s, &m.resumptionSecret) &&
len(m.resumptionSecret) != 0 &&
unmarshalCertificate(&s, &m.certificate) &&
s.Empty()
}
func (c *Conn) encryptTicket(state []byte) ([]byte, error) {
if len(c.ticketKeys) == 0 {
return nil, errors.New("tls: internal error: session ticket keys unavailable")
}
encrypted := make([]byte, ticketKeyNameLen+aes.BlockSize+len(state)+sha256.Size)
keyName := encrypted[:ticketKeyNameLen]
iv := encrypted[ticketKeyNameLen : ticketKeyNameLen+aes.BlockSize]
macBytes := encrypted[len(encrypted)-sha256.Size:]
if _, err := io.ReadFull(c.config.rand(), iv); err != nil {
return nil, err
}
key := c.ticketKeys[0]
copy(keyName, key.keyName[:])
block, err := aes.NewCipher(key.aesKey[:])
if err != nil {
return nil, errors.New("tls: failed to create cipher while encrypting ticket: " + err.Error())
}
cipher.NewCTR(block, iv).XORKeyStream(encrypted[ticketKeyNameLen+aes.BlockSize:], state)
mac := hmac.New(sha256.New, key.hmacKey[:])
mac.Write(encrypted[:len(encrypted)-sha256.Size])
mac.Sum(macBytes[:0])
return encrypted, nil
}
func (c *Conn) decryptTicket(encrypted []byte) (plaintext []byte, usedOldKey bool) {
if len(encrypted) < ticketKeyNameLen+aes.BlockSize+sha256.Size {
return nil, false
}
keyName := encrypted[:ticketKeyNameLen]
iv := encrypted[ticketKeyNameLen : ticketKeyNameLen+aes.BlockSize]
macBytes := encrypted[len(encrypted)-sha256.Size:]
ciphertext := encrypted[ticketKeyNameLen+aes.BlockSize : len(encrypted)-sha256.Size]
keyIndex := -1
for i, candidateKey := range c.ticketKeys {
if bytes.Equal(keyName, candidateKey.keyName[:]) {
keyIndex = i
break
}
}
if keyIndex == -1 {
return nil, false
}
key := &c.ticketKeys[keyIndex]
mac := hmac.New(sha256.New, key.hmacKey[:])
mac.Write(encrypted[:len(encrypted)-sha256.Size])
expected := mac.Sum(nil)
if subtle.ConstantTimeCompare(macBytes, expected) != 1 {
return nil, false
}
block, err := aes.NewCipher(key.aesKey[:])
if err != nil {
return nil, false
}
plaintext = make([]byte, len(ciphertext))
cipher.NewCTR(block, iv).XORKeyStream(plaintext, ciphertext)
return plaintext, keyIndex > 0
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package tls partially implements TLS 1.2, as specified in RFC 5246,
// and TLS 1.3, as specified in RFC 8446.
package tls
// BUG(agl): The crypto/tls package only implements some countermeasures
// against Lucky13 attacks on CBC-mode encryption, and only on SHA1
// variants. See http://www.isg.rhul.ac.uk/tls/TLStiming.pdf and
// https://www.imperialviolet.org/2013/02/04/luckythirteen.html.
import (
"bytes"
"context"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"net"
"os"
"strings"
)
// Server returns a new TLS server side connection
// using conn as the underlying transport.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func Server(conn net.Conn, config *Config) *Conn {
c := &Conn{
conn: conn,
config: config,
}
c.handshakeFn = c.serverHandshake
return c
}
// Client returns a new TLS client side connection
// using conn as the underlying transport.
// The config cannot be nil: users must set either ServerName or
// InsecureSkipVerify in the config.
func Client(conn net.Conn, config *Config) *Conn {
c := &Conn{
conn: conn,
config: config,
isClient: true,
}
c.handshakeFn = c.clientHandshake
return c
}
// A listener implements a network listener (net.Listener) for TLS connections.
type listener struct {
net.Listener
config *Config
}
// Accept waits for and returns the next incoming TLS connection.
// The returned connection is of type *Conn.
func (l *listener) Accept() (net.Conn, error) {
c, err := l.Listener.Accept()
if err != nil {
return nil, err
}
return Server(c, l.config), nil
}
// NewListener creates a Listener which accepts connections from an inner
// Listener and wraps each connection with Server.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func NewListener(inner net.Listener, config *Config) net.Listener {
l := new(listener)
l.Listener = inner
l.config = config
return l
}
// Listen creates a TLS listener accepting connections on the
// given network address using net.Listen.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func Listen(network, laddr string, config *Config) (net.Listener, error) {
if config == nil || len(config.Certificates) == 0 &&
config.GetCertificate == nil && config.GetConfigForClient == nil {
return nil, errors.New("tls: neither Certificates, GetCertificate, nor GetConfigForClient set in Config")
}
l, err := net.Listen(network, laddr)
if err != nil {
return nil, err
}
return NewListener(l, config), nil
}
type timeoutError struct{}
func (timeoutError) Error() string { return "tls: DialWithDialer timed out" }
func (timeoutError) Timeout() bool { return true }
func (timeoutError) Temporary() bool { return true }
// DialWithDialer connects to the given network address using dialer.Dial and
// then initiates a TLS handshake, returning the resulting TLS connection. Any
// timeout or deadline given in the dialer apply to connection and TLS
// handshake as a whole.
//
// DialWithDialer interprets a nil configuration as equivalent to the zero
// configuration; see the documentation of Config for the defaults.
//
// DialWithDialer uses context.Background internally; to specify the context,
// use Dialer.DialContext with NetDialer set to the desired dialer.
func DialWithDialer(dialer *net.Dialer, network, addr string, config *Config) (*Conn, error) {
return dial(context.Background(), dialer, network, addr, config)
}
func dial(ctx context.Context, netDialer *net.Dialer, network, addr string, config *Config) (*Conn, error) {
if netDialer.Timeout != 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, netDialer.Timeout)
defer cancel()
}
if !netDialer.Deadline.IsZero() {
var cancel context.CancelFunc
ctx, cancel = context.WithDeadline(ctx, netDialer.Deadline)
defer cancel()
}
rawConn, err := netDialer.DialContext(ctx, network, addr)
if err != nil {
return nil, err
}
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
hostname := addr[:colonPos]
if config == nil {
config = defaultConfig()
}
// If no ServerName is set, infer the ServerName
// from the hostname we're connecting to.
if config.ServerName == "" {
// Make a copy to avoid polluting argument or default.
c := config.Clone()
c.ServerName = hostname
config = c
}
conn := Client(rawConn, config)
if err := conn.HandshakeContext(ctx); err != nil {
rawConn.Close()
return nil, err
}
return conn, nil
}
// Dial connects to the given network address using net.Dial
// and then initiates a TLS handshake, returning the resulting
// TLS connection.
// Dial interprets a nil configuration as equivalent to
// the zero configuration; see the documentation of Config
// for the defaults.
func Dial(network, addr string, config *Config) (*Conn, error) {
return DialWithDialer(new(net.Dialer), network, addr, config)
}
// Dialer dials TLS connections given a configuration and a Dialer for the
// underlying connection.
type Dialer struct {
// NetDialer is the optional dialer to use for the TLS connections'
// underlying TCP connections.
// A nil NetDialer is equivalent to the net.Dialer zero value.
NetDialer *net.Dialer
// Config is the TLS configuration to use for new connections.
// A nil configuration is equivalent to the zero
// configuration; see the documentation of Config for the
// defaults.
Config *Config
}
// Dial connects to the given network address and initiates a TLS
// handshake, returning the resulting TLS connection.
//
// The returned Conn, if any, will always be of type *Conn.
//
// Dial uses context.Background internally; to specify the context,
// use DialContext.
func (d *Dialer) Dial(network, addr string) (net.Conn, error) {
return d.DialContext(context.Background(), network, addr)
}
func (d *Dialer) netDialer() *net.Dialer {
if d.NetDialer != nil {
return d.NetDialer
}
return new(net.Dialer)
}
// DialContext connects to the given network address and initiates a TLS
// handshake, returning the resulting TLS connection.
//
// The provided Context must be non-nil. If the context expires before
// the connection is complete, an error is returned. Once successfully
// connected, any expiration of the context will not affect the
// connection.
//
// The returned Conn, if any, will always be of type *Conn.
func (d *Dialer) DialContext(ctx context.Context, network, addr string) (net.Conn, error) {
c, err := dial(ctx, d.netDialer(), network, addr, d.Config)
if err != nil {
// Don't return c (a typed nil) in an interface.
return nil, err
}
return c, nil
}
// LoadX509KeyPair reads and parses a public/private key pair from a pair
// of files. The files must contain PEM encoded data. The certificate file
// may contain intermediate certificates following the leaf certificate to
// form a certificate chain. On successful return, Certificate.Leaf will
// be nil because the parsed form of the certificate is not retained.
func LoadX509KeyPair(certFile, keyFile string) (Certificate, error) {
certPEMBlock, err := os.ReadFile(certFile)
if err != nil {
return Certificate{}, err
}
keyPEMBlock, err := os.ReadFile(keyFile)
if err != nil {
return Certificate{}, err
}
return X509KeyPair(certPEMBlock, keyPEMBlock)
}
// X509KeyPair parses a public/private key pair from a pair of
// PEM encoded data. On successful return, Certificate.Leaf will be nil because
// the parsed form of the certificate is not retained.
func X509KeyPair(certPEMBlock, keyPEMBlock []byte) (Certificate, error) {
fail := func(err error) (Certificate, error) { return Certificate{}, err }
var cert Certificate
var skippedBlockTypes []string
for {
var certDERBlock *pem.Block
certDERBlock, certPEMBlock = pem.Decode(certPEMBlock)
if certDERBlock == nil {
break
}
if certDERBlock.Type == "CERTIFICATE" {
cert.Certificate = append(cert.Certificate, certDERBlock.Bytes)
} else {
skippedBlockTypes = append(skippedBlockTypes, certDERBlock.Type)
}
}
if len(cert.Certificate) == 0 {
if len(skippedBlockTypes) == 0 {
return fail(errors.New("tls: failed to find any PEM data in certificate input"))
}
if len(skippedBlockTypes) == 1 && strings.HasSuffix(skippedBlockTypes[0], "PRIVATE KEY") {
return fail(errors.New("tls: failed to find certificate PEM data in certificate input, but did find a private key; PEM inputs may have been switched"))
}
return fail(fmt.Errorf("tls: failed to find \"CERTIFICATE\" PEM block in certificate input after skipping PEM blocks of the following types: %v", skippedBlockTypes))
}
skippedBlockTypes = skippedBlockTypes[:0]
var keyDERBlock *pem.Block
for {
keyDERBlock, keyPEMBlock = pem.Decode(keyPEMBlock)
if keyDERBlock == nil {
if len(skippedBlockTypes) == 0 {
return fail(errors.New("tls: failed to find any PEM data in key input"))
}
if len(skippedBlockTypes) == 1 && skippedBlockTypes[0] == "CERTIFICATE" {
return fail(errors.New("tls: found a certificate rather than a key in the PEM for the private key"))
}
return fail(fmt.Errorf("tls: failed to find PEM block with type ending in \"PRIVATE KEY\" in key input after skipping PEM blocks of the following types: %v", skippedBlockTypes))
}
if keyDERBlock.Type == "PRIVATE KEY" || strings.HasSuffix(keyDERBlock.Type, " PRIVATE KEY") {
break
}
skippedBlockTypes = append(skippedBlockTypes, keyDERBlock.Type)
}
// We don't need to parse the public key for TLS, but we so do anyway
// to check that it looks sane and matches the private key.
x509Cert, err := x509.ParseCertificate(cert.Certificate[0])
if err != nil {
return fail(err)
}
cert.PrivateKey, err = parsePrivateKey(keyDERBlock.Bytes)
if err != nil {
return fail(err)
}
switch pub := x509Cert.PublicKey.(type) {
case *rsa.PublicKey:
priv, ok := cert.PrivateKey.(*rsa.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if pub.N.Cmp(priv.N) != 0 {
return fail(errors.New("tls: private key does not match public key"))
}
case *ecdsa.PublicKey:
priv, ok := cert.PrivateKey.(*ecdsa.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if pub.X.Cmp(priv.X) != 0 || pub.Y.Cmp(priv.Y) != 0 {
return fail(errors.New("tls: private key does not match public key"))
}
case ed25519.PublicKey:
priv, ok := cert.PrivateKey.(ed25519.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if !bytes.Equal(priv.Public().(ed25519.PublicKey), pub) {
return fail(errors.New("tls: private key does not match public key"))
}
default:
return fail(errors.New("tls: unknown public key algorithm"))
}
return cert, nil
}
// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
// PKCS #1 private keys by default, while OpenSSL 1.0.0 generates PKCS #8 keys.
// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
func parsePrivateKey(der []byte) (crypto.PrivateKey, error) {
if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
return key, nil
}
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
switch key := key.(type) {
case *rsa.PrivateKey, *ecdsa.PrivateKey, ed25519.PrivateKey:
return key, nil
default:
return nil, errors.New("tls: found unknown private key type in PKCS#8 wrapping")
}
}
if key, err := x509.ParseECPrivateKey(der); err == nil {
return key, nil
}
return nil, errors.New("tls: failed to parse private key")
}

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# tls
crypto/tls fork for shadowtls v3
version: go1.19.5

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import "strconv"
type alert uint8
const (
// alert level
alertLevelWarning = 1
alertLevelError = 2
)
const (
alertCloseNotify alert = 0
alertUnexpectedMessage alert = 10
alertBadRecordMAC alert = 20
alertDecryptionFailed alert = 21
alertRecordOverflow alert = 22
alertDecompressionFailure alert = 30
alertHandshakeFailure alert = 40
alertBadCertificate alert = 42
alertUnsupportedCertificate alert = 43
alertCertificateRevoked alert = 44
alertCertificateExpired alert = 45
alertCertificateUnknown alert = 46
alertIllegalParameter alert = 47
alertUnknownCA alert = 48
alertAccessDenied alert = 49
alertDecodeError alert = 50
alertDecryptError alert = 51
alertExportRestriction alert = 60
alertProtocolVersion alert = 70
alertInsufficientSecurity alert = 71
alertInternalError alert = 80
alertInappropriateFallback alert = 86
alertUserCanceled alert = 90
alertNoRenegotiation alert = 100
alertMissingExtension alert = 109
alertUnsupportedExtension alert = 110
alertCertificateUnobtainable alert = 111
alertUnrecognizedName alert = 112
alertBadCertificateStatusResponse alert = 113
alertBadCertificateHashValue alert = 114
alertUnknownPSKIdentity alert = 115
alertCertificateRequired alert = 116
alertNoApplicationProtocol alert = 120
)
var alertText = map[alert]string{
alertCloseNotify: "close notify",
alertUnexpectedMessage: "unexpected message",
alertBadRecordMAC: "bad record MAC",
alertDecryptionFailed: "decryption failed",
alertRecordOverflow: "record overflow",
alertDecompressionFailure: "decompression failure",
alertHandshakeFailure: "handshake failure",
alertBadCertificate: "bad certificate",
alertUnsupportedCertificate: "unsupported certificate",
alertCertificateRevoked: "revoked certificate",
alertCertificateExpired: "expired certificate",
alertCertificateUnknown: "unknown certificate",
alertIllegalParameter: "illegal parameter",
alertUnknownCA: "unknown certificate authority",
alertAccessDenied: "access denied",
alertDecodeError: "error decoding message",
alertDecryptError: "error decrypting message",
alertExportRestriction: "export restriction",
alertProtocolVersion: "protocol version not supported",
alertInsufficientSecurity: "insufficient security level",
alertInternalError: "internal error",
alertInappropriateFallback: "inappropriate fallback",
alertUserCanceled: "user canceled",
alertNoRenegotiation: "no renegotiation",
alertMissingExtension: "missing extension",
alertUnsupportedExtension: "unsupported extension",
alertCertificateUnobtainable: "certificate unobtainable",
alertUnrecognizedName: "unrecognized name",
alertBadCertificateStatusResponse: "bad certificate status response",
alertBadCertificateHashValue: "bad certificate hash value",
alertUnknownPSKIdentity: "unknown PSK identity",
alertCertificateRequired: "certificate required",
alertNoApplicationProtocol: "no application protocol",
}
func (e alert) String() string {
s, ok := alertText[e]
if ok {
return "tls: " + s
}
return "tls: alert(" + strconv.Itoa(int(e)) + ")"
}
func (e alert) Error() string {
return e.String()
}

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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/elliptic"
"crypto/rsa"
"errors"
"fmt"
"hash"
"io"
)
// verifyHandshakeSignature verifies a signature against pre-hashed
// (if required) handshake contents.
func verifyHandshakeSignature(sigType uint8, pubkey crypto.PublicKey, hashFunc crypto.Hash, signed, sig []byte) error {
switch sigType {
case signatureECDSA:
pubKey, ok := pubkey.(*ecdsa.PublicKey)
if !ok {
return fmt.Errorf("expected an ECDSA public key, got %T", pubkey)
}
if !ecdsa.VerifyASN1(pubKey, signed, sig) {
return errors.New("ECDSA verification failure")
}
case signatureEd25519:
pubKey, ok := pubkey.(ed25519.PublicKey)
if !ok {
return fmt.Errorf("expected an Ed25519 public key, got %T", pubkey)
}
if !ed25519.Verify(pubKey, signed, sig) {
return errors.New("Ed25519 verification failure")
}
case signaturePKCS1v15:
pubKey, ok := pubkey.(*rsa.PublicKey)
if !ok {
return fmt.Errorf("expected an RSA public key, got %T", pubkey)
}
if err := rsa.VerifyPKCS1v15(pubKey, hashFunc, signed, sig); err != nil {
return err
}
case signatureRSAPSS:
pubKey, ok := pubkey.(*rsa.PublicKey)
if !ok {
return fmt.Errorf("expected an RSA public key, got %T", pubkey)
}
signOpts := &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash}
if err := rsa.VerifyPSS(pubKey, hashFunc, signed, sig, signOpts); err != nil {
return err
}
default:
return errors.New("internal error: unknown signature type")
}
return nil
}
const (
serverSignatureContext = "TLS 1.3, server CertificateVerify\x00"
clientSignatureContext = "TLS 1.3, client CertificateVerify\x00"
)
var signaturePadding = []byte{
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
}
// signedMessage returns the pre-hashed (if necessary) message to be signed by
// certificate keys in TLS 1.3. See RFC 8446, Section 4.4.3.
func signedMessage(sigHash crypto.Hash, context string, transcript hash.Hash) []byte {
if sigHash == directSigning {
b := &bytes.Buffer{}
b.Write(signaturePadding)
io.WriteString(b, context)
b.Write(transcript.Sum(nil))
return b.Bytes()
}
h := sigHash.New()
h.Write(signaturePadding)
io.WriteString(h, context)
h.Write(transcript.Sum(nil))
return h.Sum(nil)
}
// typeAndHashFromSignatureScheme returns the corresponding signature type and
// crypto.Hash for a given TLS SignatureScheme.
func typeAndHashFromSignatureScheme(signatureAlgorithm SignatureScheme) (sigType uint8, hash crypto.Hash, err error) {
switch signatureAlgorithm {
case PKCS1WithSHA1, PKCS1WithSHA256, PKCS1WithSHA384, PKCS1WithSHA512:
sigType = signaturePKCS1v15
case PSSWithSHA256, PSSWithSHA384, PSSWithSHA512:
sigType = signatureRSAPSS
case ECDSAWithSHA1, ECDSAWithP256AndSHA256, ECDSAWithP384AndSHA384, ECDSAWithP521AndSHA512:
sigType = signatureECDSA
case Ed25519:
sigType = signatureEd25519
default:
return 0, 0, fmt.Errorf("unsupported signature algorithm: %v", signatureAlgorithm)
}
switch signatureAlgorithm {
case PKCS1WithSHA1, ECDSAWithSHA1:
hash = crypto.SHA1
case PKCS1WithSHA256, PSSWithSHA256, ECDSAWithP256AndSHA256:
hash = crypto.SHA256
case PKCS1WithSHA384, PSSWithSHA384, ECDSAWithP384AndSHA384:
hash = crypto.SHA384
case PKCS1WithSHA512, PSSWithSHA512, ECDSAWithP521AndSHA512:
hash = crypto.SHA512
case Ed25519:
hash = directSigning
default:
return 0, 0, fmt.Errorf("unsupported signature algorithm: %v", signatureAlgorithm)
}
return sigType, hash, nil
}
// legacyTypeAndHashFromPublicKey returns the fixed signature type and crypto.Hash for
// a given public key used with TLS 1.0 and 1.1, before the introduction of
// signature algorithm negotiation.
func legacyTypeAndHashFromPublicKey(pub crypto.PublicKey) (sigType uint8, hash crypto.Hash, err error) {
switch pub.(type) {
case *rsa.PublicKey:
return signaturePKCS1v15, crypto.MD5SHA1, nil
case *ecdsa.PublicKey:
return signatureECDSA, crypto.SHA1, nil
case ed25519.PublicKey:
// RFC 8422 specifies support for Ed25519 in TLS 1.0 and 1.1,
// but it requires holding on to a handshake transcript to do a
// full signature, and not even OpenSSL bothers with the
// complexity, so we can't even test it properly.
return 0, 0, fmt.Errorf("tls: Ed25519 public keys are not supported before TLS 1.2")
default:
return 0, 0, fmt.Errorf("tls: unsupported public key: %T", pub)
}
}
var rsaSignatureSchemes = []struct {
scheme SignatureScheme
minModulusBytes int
maxVersion uint16
}{
// RSA-PSS is used with PSSSaltLengthEqualsHash, and requires
// emLen >= hLen + sLen + 2
{PSSWithSHA256, crypto.SHA256.Size()*2 + 2, VersionTLS13},
{PSSWithSHA384, crypto.SHA384.Size()*2 + 2, VersionTLS13},
{PSSWithSHA512, crypto.SHA512.Size()*2 + 2, VersionTLS13},
// PKCS #1 v1.5 uses prefixes from hashPrefixes in crypto/rsa, and requires
// emLen >= len(prefix) + hLen + 11
// TLS 1.3 dropped support for PKCS #1 v1.5 in favor of RSA-PSS.
{PKCS1WithSHA256, 19 + crypto.SHA256.Size() + 11, VersionTLS12},
{PKCS1WithSHA384, 19 + crypto.SHA384.Size() + 11, VersionTLS12},
{PKCS1WithSHA512, 19 + crypto.SHA512.Size() + 11, VersionTLS12},
{PKCS1WithSHA1, 15 + crypto.SHA1.Size() + 11, VersionTLS12},
}
// signatureSchemesForCertificate returns the list of supported SignatureSchemes
// for a given certificate, based on the public key and the protocol version,
// and optionally filtered by its explicit SupportedSignatureAlgorithms.
//
// This function must be kept in sync with supportedSignatureAlgorithms.
// FIPS filtering is applied in the caller, selectSignatureScheme.
func signatureSchemesForCertificate(version uint16, cert *Certificate) []SignatureScheme {
priv, ok := cert.PrivateKey.(crypto.Signer)
if !ok {
return nil
}
var sigAlgs []SignatureScheme
switch pub := priv.Public().(type) {
case *ecdsa.PublicKey:
if version != VersionTLS13 {
// In TLS 1.2 and earlier, ECDSA algorithms are not
// constrained to a single curve.
sigAlgs = []SignatureScheme{
ECDSAWithP256AndSHA256,
ECDSAWithP384AndSHA384,
ECDSAWithP521AndSHA512,
ECDSAWithSHA1,
}
break
}
switch pub.Curve {
case elliptic.P256():
sigAlgs = []SignatureScheme{ECDSAWithP256AndSHA256}
case elliptic.P384():
sigAlgs = []SignatureScheme{ECDSAWithP384AndSHA384}
case elliptic.P521():
sigAlgs = []SignatureScheme{ECDSAWithP521AndSHA512}
default:
return nil
}
case *rsa.PublicKey:
size := pub.Size()
sigAlgs = make([]SignatureScheme, 0, len(rsaSignatureSchemes))
for _, candidate := range rsaSignatureSchemes {
if size >= candidate.minModulusBytes && version <= candidate.maxVersion {
sigAlgs = append(sigAlgs, candidate.scheme)
}
}
case ed25519.PublicKey:
sigAlgs = []SignatureScheme{Ed25519}
default:
return nil
}
if cert.SupportedSignatureAlgorithms != nil {
var filteredSigAlgs []SignatureScheme
for _, sigAlg := range sigAlgs {
if isSupportedSignatureAlgorithm(sigAlg, cert.SupportedSignatureAlgorithms) {
filteredSigAlgs = append(filteredSigAlgs, sigAlg)
}
}
return filteredSigAlgs
}
return sigAlgs
}
// selectSignatureScheme picks a SignatureScheme from the peer's preference list
// that works with the selected certificate. It's only called for protocol
// versions that support signature algorithms, so TLS 1.2 and 1.3.
func selectSignatureScheme(vers uint16, c *Certificate, peerAlgs []SignatureScheme) (SignatureScheme, error) {
supportedAlgs := signatureSchemesForCertificate(vers, c)
if len(supportedAlgs) == 0 {
return 0, unsupportedCertificateError(c)
}
if len(peerAlgs) == 0 && vers == VersionTLS12 {
// For TLS 1.2, if the client didn't send signature_algorithms then we
// can assume that it supports SHA1. See RFC 5246, Section 7.4.1.4.1.
peerAlgs = []SignatureScheme{PKCS1WithSHA1, ECDSAWithSHA1}
}
// Pick signature scheme in the peer's preference order, as our
// preference order is not configurable.
for _, preferredAlg := range peerAlgs {
if needFIPS() && !isSupportedSignatureAlgorithm(preferredAlg, fipsSupportedSignatureAlgorithms) {
continue
}
if isSupportedSignatureAlgorithm(preferredAlg, supportedAlgs) {
return preferredAlg, nil
}
}
return 0, errors.New("tls: peer doesn't support any of the certificate's signature algorithms")
}
// unsupportedCertificateError returns a helpful error for certificates with
// an unsupported private key.
func unsupportedCertificateError(cert *Certificate) error {
switch cert.PrivateKey.(type) {
case rsa.PrivateKey, ecdsa.PrivateKey:
return fmt.Errorf("tls: unsupported certificate: private key is %T, expected *%T",
cert.PrivateKey, cert.PrivateKey)
case *ed25519.PrivateKey:
return fmt.Errorf("tls: unsupported certificate: private key is *ed25519.PrivateKey, expected ed25519.PrivateKey")
}
signer, ok := cert.PrivateKey.(crypto.Signer)
if !ok {
return fmt.Errorf("tls: certificate private key (%T) does not implement crypto.Signer",
cert.PrivateKey)
}
switch pub := signer.Public().(type) {
case *ecdsa.PublicKey:
switch pub.Curve {
case elliptic.P256():
case elliptic.P384():
case elliptic.P521():
default:
return fmt.Errorf("tls: unsupported certificate curve (%s)", pub.Curve.Params().Name)
}
case *rsa.PublicKey:
return fmt.Errorf("tls: certificate RSA key size too small for supported signature algorithms")
case ed25519.PublicKey:
default:
return fmt.Errorf("tls: unsupported certificate key (%T)", pub)
}
if cert.SupportedSignatureAlgorithms != nil {
return fmt.Errorf("tls: peer doesn't support the certificate custom signature algorithms")
}
return fmt.Errorf("tls: internal error: unsupported key (%T)", cert.PrivateKey)
}

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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build boringcrypto
package tls
import (
"crypto/internal/boring/fipstls"
)
// needFIPS returns fipstls.Required(); it avoids a new import in common.go.
func needFIPS() bool {
return fipstls.Required()
}
// fipsMinVersion replaces c.minVersion in FIPS-only mode.
func fipsMinVersion(c *Config) uint16 {
// FIPS requires TLS 1.2.
return VersionTLS12
}
// fipsMaxVersion replaces c.maxVersion in FIPS-only mode.
func fipsMaxVersion(c *Config) uint16 {
// FIPS requires TLS 1.2.
return VersionTLS12
}
// default defaultFIPSCurvePreferences is the FIPS-allowed curves,
// in preference order (most preferable first).
var defaultFIPSCurvePreferences = []CurveID{CurveP256, CurveP384, CurveP521}
// fipsCurvePreferences replaces c.curvePreferences in FIPS-only mode.
func fipsCurvePreferences(c *Config) []CurveID {
if c == nil || len(c.CurvePreferences) == 0 {
return defaultFIPSCurvePreferences
}
var list []CurveID
for _, id := range c.CurvePreferences {
for _, allowed := range defaultFIPSCurvePreferences {
if id == allowed {
list = append(list, id)
break
}
}
}
return list
}
// defaultCipherSuitesFIPS are the FIPS-allowed cipher suites.
var defaultCipherSuitesFIPS = []uint16{
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
TLS_RSA_WITH_AES_128_GCM_SHA256,
TLS_RSA_WITH_AES_256_GCM_SHA384,
}
// fipsCipherSuites replaces c.cipherSuites in FIPS-only mode.
func fipsCipherSuites(c *Config) []uint16 {
if c == nil || c.CipherSuites == nil {
return defaultCipherSuitesFIPS
}
list := make([]uint16, 0, len(defaultCipherSuitesFIPS))
for _, id := range c.CipherSuites {
for _, allowed := range defaultCipherSuitesFIPS {
if id == allowed {
list = append(list, id)
break
}
}
}
return list
}
// fipsSupportedSignatureAlgorithms currently are a subset of
// defaultSupportedSignatureAlgorithms without Ed25519 and SHA-1.
var fipsSupportedSignatureAlgorithms = []SignatureScheme{
PSSWithSHA256,
PSSWithSHA384,
PSSWithSHA512,
PKCS1WithSHA256,
ECDSAWithP256AndSHA256,
PKCS1WithSHA384,
ECDSAWithP384AndSHA384,
PKCS1WithSHA512,
ECDSAWithP521AndSHA512,
}
// supportedSignatureAlgorithms returns the supported signature algorithms.
func supportedSignatureAlgorithms() []SignatureScheme {
if !needFIPS() {
return defaultSupportedSignatureAlgorithms
}
return fipsSupportedSignatureAlgorithms
}

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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto"
"crypto/aes"
"crypto/cipher"
"crypto/des"
"crypto/hmac"
"crypto/rc4"
"crypto/sha1"
"crypto/sha256"
"fmt"
"hash"
"runtime"
"golang.org/x/crypto/chacha20poly1305"
"golang.org/x/sys/cpu"
)
// CipherSuite is a TLS cipher suite. Note that most functions in this package
// accept and expose cipher suite IDs instead of this type.
type CipherSuite struct {
ID uint16
Name string
// Supported versions is the list of TLS protocol versions that can
// negotiate this cipher suite.
SupportedVersions []uint16
// Insecure is true if the cipher suite has known security issues
// due to its primitives, design, or implementation.
Insecure bool
}
var (
supportedUpToTLS12 = []uint16{VersionTLS10, VersionTLS11, VersionTLS12}
supportedOnlyTLS12 = []uint16{VersionTLS12}
supportedOnlyTLS13 = []uint16{VersionTLS13}
)
// CipherSuites returns a list of cipher suites currently implemented by this
// package, excluding those with security issues, which are returned by
// InsecureCipherSuites.
//
// The list is sorted by ID. Note that the default cipher suites selected by
// this package might depend on logic that can't be captured by a static list,
// and might not match those returned by this function.
func CipherSuites() []*CipherSuite {
return []*CipherSuite{
{TLS_RSA_WITH_AES_128_CBC_SHA, "TLS_RSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
{TLS_RSA_WITH_AES_256_CBC_SHA, "TLS_RSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
{TLS_RSA_WITH_AES_128_GCM_SHA256, "TLS_RSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
{TLS_RSA_WITH_AES_256_GCM_SHA384, "TLS_RSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},
{TLS_AES_128_GCM_SHA256, "TLS_AES_128_GCM_SHA256", supportedOnlyTLS13, false},
{TLS_AES_256_GCM_SHA384, "TLS_AES_256_GCM_SHA384", supportedOnlyTLS13, false},
{TLS_CHACHA20_POLY1305_SHA256, "TLS_CHACHA20_POLY1305_SHA256", supportedOnlyTLS13, false},
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA", supportedUpToTLS12, false},
{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA", supportedUpToTLS12, false},
{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},
{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256", supportedOnlyTLS12, false},
{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384", supportedOnlyTLS12, false},
{TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256", supportedOnlyTLS12, false},
{TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256", supportedOnlyTLS12, false},
}
}
// InsecureCipherSuites returns a list of cipher suites currently implemented by
// this package and which have security issues.
//
// Most applications should not use the cipher suites in this list, and should
// only use those returned by CipherSuites.
func InsecureCipherSuites() []*CipherSuite {
// This list includes RC4, CBC_SHA256, and 3DES cipher suites. See
// cipherSuitesPreferenceOrder for details.
return []*CipherSuite{
{TLS_RSA_WITH_RC4_128_SHA, "TLS_RSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
{TLS_RSA_WITH_3DES_EDE_CBC_SHA, "TLS_RSA_WITH_3DES_EDE_CBC_SHA", supportedUpToTLS12, true},
{TLS_RSA_WITH_AES_128_CBC_SHA256, "TLS_RSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, "TLS_ECDHE_ECDSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
{TLS_ECDHE_RSA_WITH_RC4_128_SHA, "TLS_ECDHE_RSA_WITH_RC4_128_SHA", supportedUpToTLS12, true},
{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA", supportedUpToTLS12, true},
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256", supportedOnlyTLS12, true},
}
}
// CipherSuiteName returns the standard name for the passed cipher suite ID
// (e.g. "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256"), or a fallback representation
// of the ID value if the cipher suite is not implemented by this package.
func CipherSuiteName(id uint16) string {
for _, c := range CipherSuites() {
if c.ID == id {
return c.Name
}
}
for _, c := range InsecureCipherSuites() {
if c.ID == id {
return c.Name
}
}
return fmt.Sprintf("0x%04X", id)
}
const (
// suiteECDHE indicates that the cipher suite involves elliptic curve
// Diffie-Hellman. This means that it should only be selected when the
// client indicates that it supports ECC with a curve and point format
// that we're happy with.
suiteECDHE = 1 << iota
// suiteECSign indicates that the cipher suite involves an ECDSA or
// EdDSA signature and therefore may only be selected when the server's
// certificate is ECDSA or EdDSA. If this is not set then the cipher suite
// is RSA based.
suiteECSign
// suiteTLS12 indicates that the cipher suite should only be advertised
// and accepted when using TLS 1.2.
suiteTLS12
// suiteSHA384 indicates that the cipher suite uses SHA384 as the
// handshake hash.
suiteSHA384
)
// A cipherSuite is a TLS 1.0–1.2 cipher suite, and defines the key exchange
// mechanism, as well as the cipher+MAC pair or the AEAD.
type cipherSuite struct {
id uint16
// the lengths, in bytes, of the key material needed for each component.
keyLen int
macLen int
ivLen int
ka func(version uint16) keyAgreement
// flags is a bitmask of the suite* values, above.
flags int
cipher func(key, iv []byte, isRead bool) any
mac func(key []byte) hash.Hash
aead func(key, fixedNonce []byte) aead
}
var cipherSuites = []*cipherSuite{ // TODO: replace with a map, since the order doesn't matter.
{TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305, 32, 0, 12, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadChaCha20Poly1305},
{TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, 32, 0, 12, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, nil, nil, aeadChaCha20Poly1305},
{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12, nil, nil, aeadAESGCM},
{TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, nil, nil, aeadAESGCM},
{TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheRSAKA, suiteECDHE | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
{TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, ecdheRSAKA, suiteECDHE | suiteTLS12, cipherAES, macSHA256, nil},
{TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, ecdheECDSAKA, suiteECDHE | suiteECSign | suiteTLS12, cipherAES, macSHA256, nil},
{TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, 16, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherAES, macSHA1, nil},
{TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheRSAKA, suiteECDHE, cipherAES, macSHA1, nil},
{TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, 32, 20, 16, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherAES, macSHA1, nil},
{TLS_RSA_WITH_AES_128_GCM_SHA256, 16, 0, 4, rsaKA, suiteTLS12, nil, nil, aeadAESGCM},
{TLS_RSA_WITH_AES_256_GCM_SHA384, 32, 0, 4, rsaKA, suiteTLS12 | suiteSHA384, nil, nil, aeadAESGCM},
{TLS_RSA_WITH_AES_128_CBC_SHA256, 16, 32, 16, rsaKA, suiteTLS12, cipherAES, macSHA256, nil},
{TLS_RSA_WITH_AES_128_CBC_SHA, 16, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
{TLS_RSA_WITH_AES_256_CBC_SHA, 32, 20, 16, rsaKA, 0, cipherAES, macSHA1, nil},
{TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, ecdheRSAKA, suiteECDHE, cipher3DES, macSHA1, nil},
{TLS_RSA_WITH_3DES_EDE_CBC_SHA, 24, 20, 8, rsaKA, 0, cipher3DES, macSHA1, nil},
{TLS_RSA_WITH_RC4_128_SHA, 16, 20, 0, rsaKA, 0, cipherRC4, macSHA1, nil},
{TLS_ECDHE_RSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheRSAKA, suiteECDHE, cipherRC4, macSHA1, nil},
{TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, 16, 20, 0, ecdheECDSAKA, suiteECDHE | suiteECSign, cipherRC4, macSHA1, nil},
}
// selectCipherSuite returns the first TLS 1.0–1.2 cipher suite from ids which
// is also in supportedIDs and passes the ok filter.
func selectCipherSuite(ids, supportedIDs []uint16, ok func(*cipherSuite) bool) *cipherSuite {
for _, id := range ids {
candidate := cipherSuiteByID(id)
if candidate == nil || !ok(candidate) {
continue
}
for _, suppID := range supportedIDs {
if id == suppID {
return candidate
}
}
}
return nil
}
// A cipherSuiteTLS13 defines only the pair of the AEAD algorithm and hash
// algorithm to be used with HKDF. See RFC 8446, Appendix B.4.
type cipherSuiteTLS13 struct {
id uint16
keyLen int
aead func(key, fixedNonce []byte) aead
hash crypto.Hash
}
var cipherSuitesTLS13 = []*cipherSuiteTLS13{ // TODO: replace with a map.
{TLS_AES_128_GCM_SHA256, 16, aeadAESGCMTLS13, crypto.SHA256},
{TLS_CHACHA20_POLY1305_SHA256, 32, aeadChaCha20Poly1305, crypto.SHA256},
{TLS_AES_256_GCM_SHA384, 32, aeadAESGCMTLS13, crypto.SHA384},
}
// cipherSuitesPreferenceOrder is the order in which we'll select (on the
// server) or advertise (on the client) TLS 1.0–1.2 cipher suites.
//
// Cipher suites are filtered but not reordered based on the application and
// peer's preferences, meaning we'll never select a suite lower in this list if
// any higher one is available. This makes it more defensible to keep weaker
// cipher suites enabled, especially on the server side where we get the last
// word, since there are no known downgrade attacks on cipher suites selection.
//
// The list is sorted by applying the following priority rules, stopping at the
// first (most important) applicable one:
//
// - Anything else comes before RC4
//
// RC4 has practically exploitable biases. See https://www.rc4nomore.com.
//
// - Anything else comes before CBC_SHA256
//
// SHA-256 variants of the CBC ciphersuites don't implement any Lucky13
// countermeasures. See http://www.isg.rhul.ac.uk/tls/Lucky13.html and
// https://www.imperialviolet.org/2013/02/04/luckythirteen.html.
//
// - Anything else comes before 3DES
//
// 3DES has 64-bit blocks, which makes it fundamentally susceptible to
// birthday attacks. See https://sweet32.info.
//
// - ECDHE comes before anything else
//
// Once we got the broken stuff out of the way, the most important
// property a cipher suite can have is forward secrecy. We don't
// implement FFDHE, so that means ECDHE.
//
// - AEADs come before CBC ciphers
//
// Even with Lucky13 countermeasures, MAC-then-Encrypt CBC cipher suites
// are fundamentally fragile, and suffered from an endless sequence of
// padding oracle attacks. See https://eprint.iacr.org/2015/1129,
// https://www.imperialviolet.org/2014/12/08/poodleagain.html, and
// https://blog.cloudflare.com/yet-another-padding-oracle-in-openssl-cbc-ciphersuites/.
//
// - AES comes before ChaCha20
//
// When AES hardware is available, AES-128-GCM and AES-256-GCM are faster
// than ChaCha20Poly1305.
//
// When AES hardware is not available, AES-128-GCM is one or more of: much
// slower, way more complex, and less safe (because not constant time)
// than ChaCha20Poly1305.
//
// We use this list if we think both peers have AES hardware, and
// cipherSuitesPreferenceOrderNoAES otherwise.
//
// - AES-128 comes before AES-256
//
// The only potential advantages of AES-256 are better multi-target
// margins, and hypothetical post-quantum properties. Neither apply to
// TLS, and AES-256 is slower due to its four extra rounds (which don't
// contribute to the advantages above).
//
// - ECDSA comes before RSA
//
// The relative order of ECDSA and RSA cipher suites doesn't matter,
// as they depend on the certificate. Pick one to get a stable order.
var cipherSuitesPreferenceOrder = []uint16{
// AEADs w/ ECDHE
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
// CBC w/ ECDHE
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
// AEADs w/o ECDHE
TLS_RSA_WITH_AES_128_GCM_SHA256,
TLS_RSA_WITH_AES_256_GCM_SHA384,
// CBC w/o ECDHE
TLS_RSA_WITH_AES_128_CBC_SHA,
TLS_RSA_WITH_AES_256_CBC_SHA,
// 3DES
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_RSA_WITH_3DES_EDE_CBC_SHA,
// CBC_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_RSA_WITH_AES_128_CBC_SHA256,
// RC4
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_RC4_128_SHA,
}
var cipherSuitesPreferenceOrderNoAES = []uint16{
// ChaCha20Poly1305
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
// AES-GCM w/ ECDHE
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
// The rest of cipherSuitesPreferenceOrder.
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
TLS_RSA_WITH_AES_128_GCM_SHA256,
TLS_RSA_WITH_AES_256_GCM_SHA384,
TLS_RSA_WITH_AES_128_CBC_SHA,
TLS_RSA_WITH_AES_256_CBC_SHA,
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_RSA_WITH_3DES_EDE_CBC_SHA,
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_RSA_WITH_AES_128_CBC_SHA256,
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_RC4_128_SHA,
}
// disabledCipherSuites are not used unless explicitly listed in
// Config.CipherSuites. They MUST be at the end of cipherSuitesPreferenceOrder.
var disabledCipherSuites = []uint16{
// CBC_SHA256
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
TLS_RSA_WITH_AES_128_CBC_SHA256,
// RC4
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS_ECDHE_RSA_WITH_RC4_128_SHA,
TLS_RSA_WITH_RC4_128_SHA,
}
var (
defaultCipherSuitesLen = len(cipherSuitesPreferenceOrder) - len(disabledCipherSuites)
defaultCipherSuites = cipherSuitesPreferenceOrder[:defaultCipherSuitesLen]
)
// defaultCipherSuitesTLS13 is also the preference order, since there are no
// disabled by default TLS 1.3 cipher suites. The same AES vs ChaCha20 logic as
// cipherSuitesPreferenceOrder applies.
var defaultCipherSuitesTLS13 = []uint16{
TLS_AES_128_GCM_SHA256,
TLS_AES_256_GCM_SHA384,
TLS_CHACHA20_POLY1305_SHA256,
}
var defaultCipherSuitesTLS13NoAES = []uint16{
TLS_CHACHA20_POLY1305_SHA256,
TLS_AES_128_GCM_SHA256,
TLS_AES_256_GCM_SHA384,
}
var (
hasGCMAsmAMD64 = cpu.X86.HasAES && cpu.X86.HasPCLMULQDQ
hasGCMAsmARM64 = cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
// Keep in sync with crypto/aes/cipher_s390x.go.
hasGCMAsmS390X = cpu.S390X.HasAES && cpu.S390X.HasAESCBC && cpu.S390X.HasAESCTR &&
(cpu.S390X.HasGHASH || cpu.S390X.HasAESGCM)
hasAESGCMHardwareSupport = runtime.GOARCH == "amd64" && hasGCMAsmAMD64 ||
runtime.GOARCH == "arm64" && hasGCMAsmARM64 ||
runtime.GOARCH == "s390x" && hasGCMAsmS390X
)
var aesgcmCiphers = map[uint16]bool{
// TLS 1.2
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256: true,
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384: true,
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256: true,
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384: true,
// TLS 1.3
TLS_AES_128_GCM_SHA256: true,
TLS_AES_256_GCM_SHA384: true,
}
var nonAESGCMAEADCiphers = map[uint16]bool{
// TLS 1.2
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305: true,
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305: true,
// TLS 1.3
TLS_CHACHA20_POLY1305_SHA256: true,
}
// aesgcmPreferred returns whether the first known cipher in the preference list
// is an AES-GCM cipher, implying the peer has hardware support for it.
func aesgcmPreferred(ciphers []uint16) bool {
for _, cID := range ciphers {
if c := cipherSuiteByID(cID); c != nil {
return aesgcmCiphers[cID]
}
if c := cipherSuiteTLS13ByID(cID); c != nil {
return aesgcmCiphers[cID]
}
}
return false
}
func cipherRC4(key, iv []byte, isRead bool) any {
cipher, _ := rc4.NewCipher(key)
return cipher
}
func cipher3DES(key, iv []byte, isRead bool) any {
block, _ := des.NewTripleDESCipher(key)
if isRead {
return cipher.NewCBCDecrypter(block, iv)
}
return cipher.NewCBCEncrypter(block, iv)
}
func cipherAES(key, iv []byte, isRead bool) any {
block, _ := aes.NewCipher(key)
if isRead {
return cipher.NewCBCDecrypter(block, iv)
}
return cipher.NewCBCEncrypter(block, iv)
}
// macSHA1 returns a SHA-1 based constant time MAC.
func macSHA1(key []byte) hash.Hash {
h := sha1.New
// The BoringCrypto SHA1 does not have a constant-time
// checksum function, so don't try to use it.
// if !boring.Enabled {
h = newConstantTimeHash(h)
//}
return hmac.New(h, key)
}
// macSHA256 returns a SHA-256 based MAC. This is only supported in TLS 1.2 and
// is currently only used in disabled-by-default cipher suites.
func macSHA256(key []byte) hash.Hash {
return hmac.New(sha256.New, key)
}
type aead interface {
cipher.AEAD
// explicitNonceLen returns the number of bytes of explicit nonce
// included in each record. This is eight for older AEADs and
// zero for modern ones.
explicitNonceLen() int
}
const (
aeadNonceLength = 12
noncePrefixLength = 4
)
// prefixNonceAEAD wraps an AEAD and prefixes a fixed portion of the nonce to
// each call.
type prefixNonceAEAD struct {
// nonce contains the fixed part of the nonce in the first four bytes.
nonce [aeadNonceLength]byte
aead cipher.AEAD
}
func (f *prefixNonceAEAD) NonceSize() int { return aeadNonceLength - noncePrefixLength }
func (f *prefixNonceAEAD) Overhead() int { return f.aead.Overhead() }
func (f *prefixNonceAEAD) explicitNonceLen() int { return f.NonceSize() }
func (f *prefixNonceAEAD) Seal(out, nonce, plaintext, additionalData []byte) []byte {
copy(f.nonce[4:], nonce)
return f.aead.Seal(out, f.nonce[:], plaintext, additionalData)
}
func (f *prefixNonceAEAD) Open(out, nonce, ciphertext, additionalData []byte) ([]byte, error) {
copy(f.nonce[4:], nonce)
return f.aead.Open(out, f.nonce[:], ciphertext, additionalData)
}
// xoredNonceAEAD wraps an AEAD by XORing in a fixed pattern to the nonce
// before each call.
type xorNonceAEAD struct {
nonceMask [aeadNonceLength]byte
aead cipher.AEAD
}
func (f *xorNonceAEAD) NonceSize() int { return 8 } // 64-bit sequence number
func (f *xorNonceAEAD) Overhead() int { return f.aead.Overhead() }
func (f *xorNonceAEAD) explicitNonceLen() int { return 0 }
func (f *xorNonceAEAD) Seal(out, nonce, plaintext, additionalData []byte) []byte {
for i, b := range nonce {
f.nonceMask[4+i] ^= b
}
result := f.aead.Seal(out, f.nonceMask[:], plaintext, additionalData)
for i, b := range nonce {
f.nonceMask[4+i] ^= b
}
return result
}
func (f *xorNonceAEAD) Open(out, nonce, ciphertext, additionalData []byte) ([]byte, error) {
for i, b := range nonce {
f.nonceMask[4+i] ^= b
}
result, err := f.aead.Open(out, f.nonceMask[:], ciphertext, additionalData)
for i, b := range nonce {
f.nonceMask[4+i] ^= b
}
return result, err
}
func aeadAESGCM(key, noncePrefix []byte) aead {
if len(noncePrefix) != noncePrefixLength {
panic("tls: internal error: wrong nonce length")
}
aes, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
var aead cipher.AEAD
//if boring.Enabled {
// aead, err = boring.NewGCMTLS(aes)
//} else {
// boring.Unreachable()
aead, err = cipher.NewGCM(aes)
//}
if err != nil {
panic(err)
}
ret := &prefixNonceAEAD{aead: aead}
copy(ret.nonce[:], noncePrefix)
return ret
}
func aeadAESGCMTLS13(key, nonceMask []byte) aead {
if len(nonceMask) != aeadNonceLength {
panic("tls: internal error: wrong nonce length")
}
aes, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
aead, err := cipher.NewGCM(aes)
if err != nil {
panic(err)
}
ret := &xorNonceAEAD{aead: aead}
copy(ret.nonceMask[:], nonceMask)
return ret
}
func aeadChaCha20Poly1305(key, nonceMask []byte) aead {
if len(nonceMask) != aeadNonceLength {
panic("tls: internal error: wrong nonce length")
}
aead, err := chacha20poly1305.New(key)
if err != nil {
panic(err)
}
ret := &xorNonceAEAD{aead: aead}
copy(ret.nonceMask[:], nonceMask)
return ret
}
type constantTimeHash interface {
hash.Hash
ConstantTimeSum(b []byte) []byte
}
// cthWrapper wraps any hash.Hash that implements ConstantTimeSum, and replaces
// with that all calls to Sum. It's used to obtain a ConstantTimeSum-based HMAC.
type cthWrapper struct {
h constantTimeHash
}
func (c *cthWrapper) Size() int { return c.h.Size() }
func (c *cthWrapper) BlockSize() int { return c.h.BlockSize() }
func (c *cthWrapper) Reset() { c.h.Reset() }
func (c *cthWrapper) Write(p []byte) (int, error) { return c.h.Write(p) }
func (c *cthWrapper) Sum(b []byte) []byte { return c.h.ConstantTimeSum(b) }
func newConstantTimeHash(h func() hash.Hash) func() hash.Hash {
// boring.Unreachable()
return func() hash.Hash {
return &cthWrapper{h().(constantTimeHash)}
}
}
// tls10MAC implements the TLS 1.0 MAC function. RFC 2246, Section 6.2.3.
func tls10MAC(h hash.Hash, out, seq, header, data, extra []byte) []byte {
h.Reset()
h.Write(seq)
h.Write(header)
h.Write(data)
res := h.Sum(out)
if extra != nil {
h.Write(extra)
}
return res
}
func rsaKA(version uint16) keyAgreement {
return rsaKeyAgreement{}
}
func ecdheECDSAKA(version uint16) keyAgreement {
return &ecdheKeyAgreement{
isRSA: false,
version: version,
}
}
func ecdheRSAKA(version uint16) keyAgreement {
return &ecdheKeyAgreement{
isRSA: true,
version: version,
}
}
// mutualCipherSuite returns a cipherSuite given a list of supported
// ciphersuites and the id requested by the peer.
func mutualCipherSuite(have []uint16, want uint16) *cipherSuite {
for _, id := range have {
if id == want {
return cipherSuiteByID(id)
}
}
return nil
}
func cipherSuiteByID(id uint16) *cipherSuite {
for _, cipherSuite := range cipherSuites {
if cipherSuite.id == id {
return cipherSuite
}
}
return nil
}
func mutualCipherSuiteTLS13(have []uint16, want uint16) *cipherSuiteTLS13 {
for _, id := range have {
if id == want {
return cipherSuiteTLS13ByID(id)
}
}
return nil
}
func cipherSuiteTLS13ByID(id uint16) *cipherSuiteTLS13 {
for _, cipherSuite := range cipherSuitesTLS13 {
if cipherSuite.id == id {
return cipherSuite
}
}
return nil
}
// A list of cipher suite IDs that are, or have been, implemented by this
// package.
//
// See https://www.iana.org/assignments/tls-parameters/tls-parameters.xml
const (
// TLS 1.0 - 1.2 cipher suites.
TLS_RSA_WITH_RC4_128_SHA uint16 = 0x0005
TLS_RSA_WITH_3DES_EDE_CBC_SHA uint16 = 0x000a
TLS_RSA_WITH_AES_128_CBC_SHA uint16 = 0x002f
TLS_RSA_WITH_AES_256_CBC_SHA uint16 = 0x0035
TLS_RSA_WITH_AES_128_CBC_SHA256 uint16 = 0x003c
TLS_RSA_WITH_AES_128_GCM_SHA256 uint16 = 0x009c
TLS_RSA_WITH_AES_256_GCM_SHA384 uint16 = 0x009d
TLS_ECDHE_ECDSA_WITH_RC4_128_SHA uint16 = 0xc007
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA uint16 = 0xc009
TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA uint16 = 0xc00a
TLS_ECDHE_RSA_WITH_RC4_128_SHA uint16 = 0xc011
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA uint16 = 0xc012
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA uint16 = 0xc013
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA uint16 = 0xc014
TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 uint16 = 0xc023
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 uint16 = 0xc027
TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02f
TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 uint16 = 0xc02b
TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 uint16 = 0xc030
TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 uint16 = 0xc02c
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xcca8
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 uint16 = 0xcca9
// TLS 1.3 cipher suites.
TLS_AES_128_GCM_SHA256 uint16 = 0x1301
TLS_AES_256_GCM_SHA384 uint16 = 0x1302
TLS_CHACHA20_POLY1305_SHA256 uint16 = 0x1303
// TLS_FALLBACK_SCSV isn't a standard cipher suite but an indicator
// that the client is doing version fallback. See RFC 7507.
TLS_FALLBACK_SCSV uint16 = 0x5600
// Legacy names for the corresponding cipher suites with the correct _SHA256
// suffix, retained for backward compatibility.
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305 = TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305 = TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256
)

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// Code generated by "stringer -type=SignatureScheme,CurveID,ClientAuthType -output=common_string.go"; DO NOT EDIT.
package tls
import "strconv"
func _() {
// An "invalid array index" compiler error signifies that the constant values have changed.
// Re-run the stringer command to generate them again.
var x [1]struct{}
_ = x[PKCS1WithSHA256-1025]
_ = x[PKCS1WithSHA384-1281]
_ = x[PKCS1WithSHA512-1537]
_ = x[PSSWithSHA256-2052]
_ = x[PSSWithSHA384-2053]
_ = x[PSSWithSHA512-2054]
_ = x[ECDSAWithP256AndSHA256-1027]
_ = x[ECDSAWithP384AndSHA384-1283]
_ = x[ECDSAWithP521AndSHA512-1539]
_ = x[Ed25519-2055]
_ = x[PKCS1WithSHA1-513]
_ = x[ECDSAWithSHA1-515]
}
const (
_SignatureScheme_name_0 = "PKCS1WithSHA1"
_SignatureScheme_name_1 = "ECDSAWithSHA1"
_SignatureScheme_name_2 = "PKCS1WithSHA256"
_SignatureScheme_name_3 = "ECDSAWithP256AndSHA256"
_SignatureScheme_name_4 = "PKCS1WithSHA384"
_SignatureScheme_name_5 = "ECDSAWithP384AndSHA384"
_SignatureScheme_name_6 = "PKCS1WithSHA512"
_SignatureScheme_name_7 = "ECDSAWithP521AndSHA512"
_SignatureScheme_name_8 = "PSSWithSHA256PSSWithSHA384PSSWithSHA512Ed25519"
)
var (
_SignatureScheme_index_8 = [...]uint8{0, 13, 26, 39, 46}
)
func (i SignatureScheme) String() string {
switch {
case i == 513:
return _SignatureScheme_name_0
case i == 515:
return _SignatureScheme_name_1
case i == 1025:
return _SignatureScheme_name_2
case i == 1027:
return _SignatureScheme_name_3
case i == 1281:
return _SignatureScheme_name_4
case i == 1283:
return _SignatureScheme_name_5
case i == 1537:
return _SignatureScheme_name_6
case i == 1539:
return _SignatureScheme_name_7
case 2052 <= i && i <= 2055:
i -= 2052
return _SignatureScheme_name_8[_SignatureScheme_index_8[i]:_SignatureScheme_index_8[i+1]]
default:
return "SignatureScheme(" + strconv.FormatInt(int64(i), 10) + ")"
}
}
func _() {
// An "invalid array index" compiler error signifies that the constant values have changed.
// Re-run the stringer command to generate them again.
var x [1]struct{}
_ = x[CurveP256-23]
_ = x[CurveP384-24]
_ = x[CurveP521-25]
_ = x[X25519-29]
}
const (
_CurveID_name_0 = "CurveP256CurveP384CurveP521"
_CurveID_name_1 = "X25519"
)
var (
_CurveID_index_0 = [...]uint8{0, 9, 18, 27}
)
func (i CurveID) String() string {
switch {
case 23 <= i && i <= 25:
i -= 23
return _CurveID_name_0[_CurveID_index_0[i]:_CurveID_index_0[i+1]]
case i == 29:
return _CurveID_name_1
default:
return "CurveID(" + strconv.FormatInt(int64(i), 10) + ")"
}
}
func _() {
// An "invalid array index" compiler error signifies that the constant values have changed.
// Re-run the stringer command to generate them again.
var x [1]struct{}
_ = x[NoClientCert-0]
_ = x[RequestClientCert-1]
_ = x[RequireAnyClientCert-2]
_ = x[VerifyClientCertIfGiven-3]
_ = x[RequireAndVerifyClientCert-4]
}
const _ClientAuthType_name = "NoClientCertRequestClientCertRequireAnyClientCertVerifyClientCertIfGivenRequireAndVerifyClientCert"
var _ClientAuthType_index = [...]uint8{0, 12, 29, 49, 72, 98}
func (i ClientAuthType) String() string {
if i < 0 || i >= ClientAuthType(len(_ClientAuthType_index)-1) {
return "ClientAuthType(" + strconv.FormatInt(int64(i), 10) + ")"
}
return _ClientAuthType_name[_ClientAuthType_index[i]:_ClientAuthType_index[i+1]]
}

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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"bytes"
"context"
"crypto"
"crypto/hmac"
"crypto/rsa"
"errors"
"hash"
"sync/atomic"
"time"
)
type clientHandshakeStateTLS13 struct {
c *Conn
ctx context.Context
serverHello *serverHelloMsg
hello *clientHelloMsg
ecdheParams ecdheParameters
session *ClientSessionState
earlySecret []byte
binderKey []byte
certReq *certificateRequestMsgTLS13
usingPSK bool
sentDummyCCS bool
suite *cipherSuiteTLS13
transcript hash.Hash
masterSecret []byte
trafficSecret []byte // client_application_traffic_secret_0
}
// handshake requires hs.c, hs.hello, hs.serverHello, hs.ecdheParams, and,
// optionally, hs.session, hs.earlySecret and hs.binderKey to be set.
func (hs *clientHandshakeStateTLS13) handshake() error {
c := hs.c
if needFIPS() {
return errors.New("tls: internal error: TLS 1.3 reached in FIPS mode")
}
// The server must not select TLS 1.3 in a renegotiation. See RFC 8446,
// sections 4.1.2 and 4.1.3.
if c.handshakes > 0 {
c.sendAlert(alertProtocolVersion)
return errors.New("tls: server selected TLS 1.3 in a renegotiation")
}
// Consistency check on the presence of a keyShare and its parameters.
if hs.ecdheParams == nil || len(hs.hello.keyShares) != 1 {
return c.sendAlert(alertInternalError)
}
if err := hs.checkServerHelloOrHRR(); err != nil {
return err
}
hs.transcript = hs.suite.hash.New()
hs.transcript.Write(hs.hello.marshal())
if bytes.Equal(hs.serverHello.random, helloRetryRequestRandom) {
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
if err := hs.processHelloRetryRequest(); err != nil {
return err
}
}
hs.transcript.Write(hs.serverHello.marshal())
c.buffering = true
if err := hs.processServerHello(); err != nil {
return err
}
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
if err := hs.establishHandshakeKeys(); err != nil {
return err
}
if err := hs.readServerParameters(); err != nil {
return err
}
if err := hs.readServerCertificate(); err != nil {
return err
}
if err := hs.readServerFinished(); err != nil {
return err
}
if err := hs.sendClientCertificate(); err != nil {
return err
}
if err := hs.sendClientFinished(); err != nil {
return err
}
if _, err := c.flush(); err != nil {
return err
}
atomic.StoreUint32(&c.handshakeStatus, 1)
return nil
}
// checkServerHelloOrHRR does validity checks that apply to both ServerHello and
// HelloRetryRequest messages. It sets hs.suite.
func (hs *clientHandshakeStateTLS13) checkServerHelloOrHRR() error {
c := hs.c
if hs.serverHello.supportedVersion == 0 {
c.sendAlert(alertMissingExtension)
return errors.New("tls: server selected TLS 1.3 using the legacy version field")
}
if hs.serverHello.supportedVersion != VersionTLS13 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected an invalid version after a HelloRetryRequest")
}
if hs.serverHello.vers != VersionTLS12 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server sent an incorrect legacy version")
}
if hs.serverHello.ocspStapling ||
hs.serverHello.ticketSupported ||
hs.serverHello.secureRenegotiationSupported ||
len(hs.serverHello.secureRenegotiation) != 0 ||
len(hs.serverHello.alpnProtocol) != 0 ||
len(hs.serverHello.scts) != 0 {
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: server sent a ServerHello extension forbidden in TLS 1.3")
}
if !bytes.Equal(hs.hello.sessionId, hs.serverHello.sessionId) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server did not echo the legacy session ID")
}
if hs.serverHello.compressionMethod != compressionNone {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected unsupported compression format")
}
selectedSuite := mutualCipherSuiteTLS13(hs.hello.cipherSuites, hs.serverHello.cipherSuite)
if hs.suite != nil && selectedSuite != hs.suite {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server changed cipher suite after a HelloRetryRequest")
}
if selectedSuite == nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server chose an unconfigured cipher suite")
}
hs.suite = selectedSuite
c.cipherSuite = hs.suite.id
return nil
}
// sendDummyChangeCipherSpec sends a ChangeCipherSpec record for compatibility
// with middleboxes that didn't implement TLS correctly. See RFC 8446, Appendix D.4.
func (hs *clientHandshakeStateTLS13) sendDummyChangeCipherSpec() error {
if hs.sentDummyCCS {
return nil
}
hs.sentDummyCCS = true
_, err := hs.c.writeRecord(recordTypeChangeCipherSpec, []byte{1})
return err
}
// processHelloRetryRequest handles the HRR in hs.serverHello, modifies and
// resends hs.hello, and reads the new ServerHello into hs.serverHello.
func (hs *clientHandshakeStateTLS13) processHelloRetryRequest() error {
c := hs.c
// The first ClientHello gets double-hashed into the transcript upon a
// HelloRetryRequest. (The idea is that the server might offload transcript
// storage to the client in the cookie.) See RFC 8446, Section 4.4.1.
chHash := hs.transcript.Sum(nil)
hs.transcript.Reset()
hs.transcript.Write([]byte{typeMessageHash, 0, 0, uint8(len(chHash))})
hs.transcript.Write(chHash)
hs.transcript.Write(hs.serverHello.marshal())
// The only HelloRetryRequest extensions we support are key_share and
// cookie, and clients must abort the handshake if the HRR would not result
// in any change in the ClientHello.
if hs.serverHello.selectedGroup == 0 && hs.serverHello.cookie == nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server sent an unnecessary HelloRetryRequest message")
}
if hs.serverHello.cookie != nil {
hs.hello.cookie = hs.serverHello.cookie
}
if hs.serverHello.serverShare.group != 0 {
c.sendAlert(alertDecodeError)
return errors.New("tls: received malformed key_share extension")
}
// If the server sent a key_share extension selecting a group, ensure it's
// a group we advertised but did not send a key share for, and send a key
// share for it this time.
if curveID := hs.serverHello.selectedGroup; curveID != 0 {
curveOK := false
for _, id := range hs.hello.supportedCurves {
if id == curveID {
curveOK = true
break
}
}
if !curveOK {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected unsupported group")
}
if hs.ecdheParams.CurveID() == curveID {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server sent an unnecessary HelloRetryRequest key_share")
}
if _, ok := curveForCurveID(curveID); curveID != X25519 && !ok {
c.sendAlert(alertInternalError)
return errors.New("tls: CurvePreferences includes unsupported curve")
}
params, err := generateECDHEParameters(c.config.rand(), curveID)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
hs.ecdheParams = params
hs.hello.keyShares = []keyShare{{group: curveID, data: params.PublicKey()}}
}
hs.hello.raw = nil
if len(hs.hello.pskIdentities) > 0 {
pskSuite := cipherSuiteTLS13ByID(hs.session.cipherSuite)
if pskSuite == nil {
return c.sendAlert(alertInternalError)
}
if pskSuite.hash == hs.suite.hash {
// Update binders and obfuscated_ticket_age.
ticketAge := uint32(c.config.time().Sub(hs.session.receivedAt) / time.Millisecond)
hs.hello.pskIdentities[0].obfuscatedTicketAge = ticketAge + hs.session.ageAdd
transcript := hs.suite.hash.New()
transcript.Write([]byte{typeMessageHash, 0, 0, uint8(len(chHash))})
transcript.Write(chHash)
transcript.Write(hs.serverHello.marshal())
transcript.Write(hs.hello.marshalWithoutBinders())
pskBinders := [][]byte{hs.suite.finishedHash(hs.binderKey, transcript)}
hs.hello.updateBinders(pskBinders)
} else {
// Server selected a cipher suite incompatible with the PSK.
hs.hello.pskIdentities = nil
hs.hello.pskBinders = nil
}
}
hs.transcript.Write(hs.hello.marshal())
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
return err
}
msg, err := c.readHandshake()
if err != nil {
return err
}
serverHello, ok := msg.(*serverHelloMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(serverHello, msg)
}
hs.serverHello = serverHello
if err := hs.checkServerHelloOrHRR(); err != nil {
return err
}
return nil
}
func (hs *clientHandshakeStateTLS13) processServerHello() error {
c := hs.c
if bytes.Equal(hs.serverHello.random, helloRetryRequestRandom) {
c.sendAlert(alertUnexpectedMessage)
return errors.New("tls: server sent two HelloRetryRequest messages")
}
if len(hs.serverHello.cookie) != 0 {
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: server sent a cookie in a normal ServerHello")
}
if hs.serverHello.selectedGroup != 0 {
c.sendAlert(alertDecodeError)
return errors.New("tls: malformed key_share extension")
}
if hs.serverHello.serverShare.group == 0 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server did not send a key share")
}
if hs.serverHello.serverShare.group != hs.ecdheParams.CurveID() {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected unsupported group")
}
if !hs.serverHello.selectedIdentityPresent {
return nil
}
if int(hs.serverHello.selectedIdentity) >= len(hs.hello.pskIdentities) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected an invalid PSK")
}
if len(hs.hello.pskIdentities) != 1 || hs.session == nil {
return c.sendAlert(alertInternalError)
}
pskSuite := cipherSuiteTLS13ByID(hs.session.cipherSuite)
if pskSuite == nil {
return c.sendAlert(alertInternalError)
}
if pskSuite.hash != hs.suite.hash {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: server selected an invalid PSK and cipher suite pair")
}
hs.usingPSK = true
c.didResume = true
c.peerCertificates = hs.session.serverCertificates
c.verifiedChains = hs.session.verifiedChains
c.ocspResponse = hs.session.ocspResponse
c.scts = hs.session.scts
return nil
}
func (hs *clientHandshakeStateTLS13) establishHandshakeKeys() error {
c := hs.c
sharedKey := hs.ecdheParams.SharedKey(hs.serverHello.serverShare.data)
if sharedKey == nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid server key share")
}
earlySecret := hs.earlySecret
if !hs.usingPSK {
earlySecret = hs.suite.extract(nil, nil)
}
handshakeSecret := hs.suite.extract(sharedKey,
hs.suite.deriveSecret(earlySecret, "derived", nil))
clientSecret := hs.suite.deriveSecret(handshakeSecret,
clientHandshakeTrafficLabel, hs.transcript)
c.out.setTrafficSecret(hs.suite, clientSecret)
serverSecret := hs.suite.deriveSecret(handshakeSecret,
serverHandshakeTrafficLabel, hs.transcript)
c.in.setTrafficSecret(hs.suite, serverSecret)
err := c.config.writeKeyLog(keyLogLabelClientHandshake, hs.hello.random, clientSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerHandshake, hs.hello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
hs.masterSecret = hs.suite.extract(nil,
hs.suite.deriveSecret(handshakeSecret, "derived", nil))
return nil
}
func (hs *clientHandshakeStateTLS13) readServerParameters() error {
c := hs.c
msg, err := c.readHandshake()
if err != nil {
return err
}
encryptedExtensions, ok := msg.(*encryptedExtensionsMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(encryptedExtensions, msg)
}
hs.transcript.Write(encryptedExtensions.marshal())
if err := checkALPN(hs.hello.alpnProtocols, encryptedExtensions.alpnProtocol); err != nil {
c.sendAlert(alertUnsupportedExtension)
return err
}
c.clientProtocol = encryptedExtensions.alpnProtocol
return nil
}
func (hs *clientHandshakeStateTLS13) readServerCertificate() error {
c := hs.c
// Either a PSK or a certificate is always used, but not both.
// See RFC 8446, Section 4.1.1.
if hs.usingPSK {
// Make sure the connection is still being verified whether or not this
// is a resumption. Resumptions currently don't reverify certificates so
// they don't call verifyServerCertificate. See Issue 31641.
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
return nil
}
msg, err := c.readHandshake()
if err != nil {
return err
}
certReq, ok := msg.(*certificateRequestMsgTLS13)
if ok {
hs.transcript.Write(certReq.marshal())
hs.certReq = certReq
msg, err = c.readHandshake()
if err != nil {
return err
}
}
certMsg, ok := msg.(*certificateMsgTLS13)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certMsg, msg)
}
if len(certMsg.certificate.Certificate) == 0 {
c.sendAlert(alertDecodeError)
return errors.New("tls: received empty certificates message")
}
hs.transcript.Write(certMsg.marshal())
c.scts = certMsg.certificate.SignedCertificateTimestamps
c.ocspResponse = certMsg.certificate.OCSPStaple
if err := c.verifyServerCertificate(certMsg.certificate.Certificate); err != nil {
return err
}
msg, err = c.readHandshake()
if err != nil {
return err
}
certVerify, ok := msg.(*certificateVerifyMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certVerify, msg)
}
// See RFC 8446, Section 4.4.3.
if !isSupportedSignatureAlgorithm(certVerify.signatureAlgorithm, supportedSignatureAlgorithms()) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: certificate used with invalid signature algorithm")
}
sigType, sigHash, err := typeAndHashFromSignatureScheme(certVerify.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
if sigType == signaturePKCS1v15 || sigHash == crypto.SHA1 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: certificate used with invalid signature algorithm")
}
signed := signedMessage(sigHash, serverSignatureContext, hs.transcript)
if err := verifyHandshakeSignature(sigType, c.peerCertificates[0].PublicKey,
sigHash, signed, certVerify.signature); err != nil {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid signature by the server certificate: " + err.Error())
}
hs.transcript.Write(certVerify.marshal())
return nil
}
func (hs *clientHandshakeStateTLS13) readServerFinished() error {
c := hs.c
msg, err := c.readHandshake()
if err != nil {
return err
}
finished, ok := msg.(*finishedMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(finished, msg)
}
expectedMAC := hs.suite.finishedHash(c.in.trafficSecret, hs.transcript)
if !hmac.Equal(expectedMAC, finished.verifyData) {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid server finished hash")
}
hs.transcript.Write(finished.marshal())
// Derive secrets that take context through the server Finished.
hs.trafficSecret = hs.suite.deriveSecret(hs.masterSecret,
clientApplicationTrafficLabel, hs.transcript)
serverSecret := hs.suite.deriveSecret(hs.masterSecret,
serverApplicationTrafficLabel, hs.transcript)
c.in.setTrafficSecret(hs.suite, serverSecret)
err = c.config.writeKeyLog(keyLogLabelClientTraffic, hs.hello.random, hs.trafficSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerTraffic, hs.hello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
c.ekm = hs.suite.exportKeyingMaterial(hs.masterSecret, hs.transcript)
return nil
}
func (hs *clientHandshakeStateTLS13) sendClientCertificate() error {
c := hs.c
if hs.certReq == nil {
return nil
}
cert, err := c.getClientCertificate(&CertificateRequestInfo{
AcceptableCAs: hs.certReq.certificateAuthorities,
SignatureSchemes: hs.certReq.supportedSignatureAlgorithms,
Version: c.vers,
ctx: hs.ctx,
})
if err != nil {
return err
}
certMsg := new(certificateMsgTLS13)
certMsg.certificate = *cert
certMsg.scts = hs.certReq.scts && len(cert.SignedCertificateTimestamps) > 0
certMsg.ocspStapling = hs.certReq.ocspStapling && len(cert.OCSPStaple) > 0
hs.transcript.Write(certMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certMsg.marshal()); err != nil {
return err
}
// If we sent an empty certificate message, skip the CertificateVerify.
if len(cert.Certificate) == 0 {
return nil
}
certVerifyMsg := new(certificateVerifyMsg)
certVerifyMsg.hasSignatureAlgorithm = true
certVerifyMsg.signatureAlgorithm, err = selectSignatureScheme(c.vers, cert, hs.certReq.supportedSignatureAlgorithms)
if err != nil {
// getClientCertificate returned a certificate incompatible with the
// CertificateRequestInfo supported signature algorithms.
c.sendAlert(alertHandshakeFailure)
return err
}
sigType, sigHash, err := typeAndHashFromSignatureScheme(certVerifyMsg.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
signed := signedMessage(sigHash, clientSignatureContext, hs.transcript)
signOpts := crypto.SignerOpts(sigHash)
if sigType == signatureRSAPSS {
signOpts = &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash, Hash: sigHash}
}
sig, err := cert.PrivateKey.(crypto.Signer).Sign(c.config.rand(), signed, signOpts)
if err != nil {
c.sendAlert(alertInternalError)
return errors.New("tls: failed to sign handshake: " + err.Error())
}
certVerifyMsg.signature = sig
hs.transcript.Write(certVerifyMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certVerifyMsg.marshal()); err != nil {
return err
}
return nil
}
func (hs *clientHandshakeStateTLS13) sendClientFinished() error {
c := hs.c
finished := &finishedMsg{
verifyData: hs.suite.finishedHash(c.out.trafficSecret, hs.transcript),
}
hs.transcript.Write(finished.marshal())
if _, err := c.writeRecord(recordTypeHandshake, finished.marshal()); err != nil {
return err
}
c.out.setTrafficSecret(hs.suite, hs.trafficSecret)
if !c.config.SessionTicketsDisabled && c.config.ClientSessionCache != nil {
c.resumptionSecret = hs.suite.deriveSecret(hs.masterSecret,
resumptionLabel, hs.transcript)
}
return nil
}
func (c *Conn) handleNewSessionTicket(msg *newSessionTicketMsgTLS13) error {
if !c.isClient {
c.sendAlert(alertUnexpectedMessage)
return errors.New("tls: received new session ticket from a client")
}
if c.config.SessionTicketsDisabled || c.config.ClientSessionCache == nil {
return nil
}
// See RFC 8446, Section 4.6.1.
if msg.lifetime == 0 {
return nil
}
lifetime := time.Duration(msg.lifetime) * time.Second
if lifetime > maxSessionTicketLifetime {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: received a session ticket with invalid lifetime")
}
cipherSuite := cipherSuiteTLS13ByID(c.cipherSuite)
if cipherSuite == nil || c.resumptionSecret == nil {
return c.sendAlert(alertInternalError)
}
// Save the resumption_master_secret and nonce instead of deriving the PSK
// to do the least amount of work on NewSessionTicket messages before we
// know if the ticket will be used. Forward secrecy of resumed connections
// is guaranteed by the requirement for pskModeDHE.
session := &ClientSessionState{
sessionTicket: msg.label,
vers: c.vers,
cipherSuite: c.cipherSuite,
masterSecret: c.resumptionSecret,
serverCertificates: c.peerCertificates,
verifiedChains: c.verifiedChains,
receivedAt: c.config.time(),
nonce: msg.nonce,
useBy: c.config.time().Add(lifetime),
ageAdd: msg.ageAdd,
ocspResponse: c.ocspResponse,
scts: c.scts,
}
cacheKey := clientSessionCacheKey(c.conn.RemoteAddr(), c.config)
c.config.ClientSessionCache.Put(cacheKey, session)
return nil
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"context"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/subtle"
"crypto/x509"
"errors"
"fmt"
"hash"
"io"
"sync/atomic"
"time"
)
// serverHandshakeState contains details of a server handshake in progress.
// It's discarded once the handshake has completed.
type serverHandshakeState struct {
c *Conn
ctx context.Context
clientHello *clientHelloMsg
hello *serverHelloMsg
suite *cipherSuite
ecdheOk bool
ecSignOk bool
rsaDecryptOk bool
rsaSignOk bool
sessionState *sessionState
finishedHash finishedHash
masterSecret []byte
cert *Certificate
}
// serverHandshake performs a TLS handshake as a server.
func (c *Conn) serverHandshake(ctx context.Context) error {
clientHello, err := c.readClientHello(ctx)
if err != nil {
return err
}
if c.vers == VersionTLS13 {
hs := serverHandshakeStateTLS13{
c: c,
ctx: ctx,
clientHello: clientHello,
}
return hs.handshake()
}
hs := serverHandshakeState{
c: c,
ctx: ctx,
clientHello: clientHello,
}
return hs.handshake()
}
func (hs *serverHandshakeState) handshake() error {
c := hs.c
if err := hs.processClientHello(); err != nil {
return err
}
// For an overview of TLS handshaking, see RFC 5246, Section 7.3.
c.buffering = true
if hs.checkForResumption() {
// The client has included a session ticket and so we do an abbreviated handshake.
c.didResume = true
if err := hs.doResumeHandshake(); err != nil {
return err
}
if err := hs.establishKeys(); err != nil {
return err
}
if err := hs.sendSessionTicket(); err != nil {
return err
}
if err := hs.sendFinished(c.serverFinished[:]); err != nil {
return err
}
if _, err := c.flush(); err != nil {
return err
}
c.clientFinishedIsFirst = false
if err := hs.readFinished(nil); err != nil {
return err
}
} else {
// The client didn't include a session ticket, or it wasn't
// valid so we do a full handshake.
if err := hs.pickCipherSuite(); err != nil {
return err
}
if err := hs.doFullHandshake(); err != nil {
return err
}
if err := hs.establishKeys(); err != nil {
return err
}
if err := hs.readFinished(c.clientFinished[:]); err != nil {
return err
}
c.clientFinishedIsFirst = true
c.buffering = true
if err := hs.sendSessionTicket(); err != nil {
return err
}
if err := hs.sendFinished(nil); err != nil {
return err
}
if _, err := c.flush(); err != nil {
return err
}
}
c.ekm = ekmFromMasterSecret(c.vers, hs.suite, hs.masterSecret, hs.clientHello.random, hs.hello.random)
atomic.StoreUint32(&c.handshakeStatus, 1)
return nil
}
// readClientHello reads a ClientHello message and selects the protocol version.
func (c *Conn) readClientHello(ctx context.Context) (*clientHelloMsg, error) {
msg, err := c.readHandshake()
if err != nil {
return nil, err
}
clientHello, ok := msg.(*clientHelloMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return nil, unexpectedMessageError(clientHello, msg)
}
var configForClient *Config
originalConfig := c.config
if c.config.GetConfigForClient != nil {
chi := clientHelloInfo(ctx, c, clientHello)
if configForClient, err = c.config.GetConfigForClient(chi); err != nil {
c.sendAlert(alertInternalError)
return nil, err
} else if configForClient != nil {
c.config = configForClient
}
}
c.ticketKeys = originalConfig.ticketKeys(configForClient)
clientVersions := clientHello.supportedVersions
if len(clientHello.supportedVersions) == 0 {
clientVersions = supportedVersionsFromMax(clientHello.vers)
}
c.vers, ok = c.config.mutualVersion(roleServer, clientVersions)
if !ok {
c.sendAlert(alertProtocolVersion)
return nil, fmt.Errorf("tls: client offered only unsupported versions: %x", clientVersions)
}
c.haveVers = true
c.in.version = c.vers
c.out.version = c.vers
return clientHello, nil
}
func (hs *serverHandshakeState) processClientHello() error {
c := hs.c
hs.hello = new(serverHelloMsg)
hs.hello.vers = c.vers
foundCompression := false
// We only support null compression, so check that the client offered it.
for _, compression := range hs.clientHello.compressionMethods {
if compression == compressionNone {
foundCompression = true
break
}
}
if !foundCompression {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: client does not support uncompressed connections")
}
hs.hello.random = make([]byte, 32)
serverRandom := hs.hello.random
// Downgrade protection canaries. See RFC 8446, Section 4.1.3.
maxVers := c.config.maxSupportedVersion(roleServer)
if maxVers >= VersionTLS12 && c.vers < maxVers || testingOnlyForceDowngradeCanary {
if c.vers == VersionTLS12 {
copy(serverRandom[24:], downgradeCanaryTLS12)
} else {
copy(serverRandom[24:], downgradeCanaryTLS11)
}
serverRandom = serverRandom[:24]
}
_, err := io.ReadFull(c.config.rand(), serverRandom)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
if len(hs.clientHello.secureRenegotiation) != 0 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: initial handshake had non-empty renegotiation extension")
}
hs.hello.secureRenegotiationSupported = hs.clientHello.secureRenegotiationSupported
hs.hello.compressionMethod = compressionNone
if len(hs.clientHello.serverName) > 0 {
c.serverName = hs.clientHello.serverName
}
selectedProto, err := negotiateALPN(c.config.NextProtos, hs.clientHello.alpnProtocols)
if err != nil {
c.sendAlert(alertNoApplicationProtocol)
return err
}
hs.hello.alpnProtocol = selectedProto
c.clientProtocol = selectedProto
hs.cert, err = c.config.getCertificate(clientHelloInfo(hs.ctx, c, hs.clientHello))
if err != nil {
if err == errNoCertificates {
c.sendAlert(alertUnrecognizedName)
} else {
c.sendAlert(alertInternalError)
}
return err
}
if hs.clientHello.scts {
hs.hello.scts = hs.cert.SignedCertificateTimestamps
}
hs.ecdheOk = supportsECDHE(c.config, hs.clientHello.supportedCurves, hs.clientHello.supportedPoints)
if hs.ecdheOk && len(hs.clientHello.supportedPoints) > 0 {
// Although omitting the ec_point_formats extension is permitted, some
// old OpenSSL version will refuse to handshake if not present.
//
// Per RFC 4492, section 5.1.2, implementations MUST support the
// uncompressed point format. See golang.org/issue/31943.
hs.hello.supportedPoints = []uint8{pointFormatUncompressed}
}
if priv, ok := hs.cert.PrivateKey.(crypto.Signer); ok {
switch priv.Public().(type) {
case *ecdsa.PublicKey:
hs.ecSignOk = true
case ed25519.PublicKey:
hs.ecSignOk = true
case *rsa.PublicKey:
hs.rsaSignOk = true
default:
c.sendAlert(alertInternalError)
return fmt.Errorf("tls: unsupported signing key type (%T)", priv.Public())
}
}
if priv, ok := hs.cert.PrivateKey.(crypto.Decrypter); ok {
switch priv.Public().(type) {
case *rsa.PublicKey:
hs.rsaDecryptOk = true
default:
c.sendAlert(alertInternalError)
return fmt.Errorf("tls: unsupported decryption key type (%T)", priv.Public())
}
}
return nil
}
// negotiateALPN picks a shared ALPN protocol that both sides support in server
// preference order. If ALPN is not configured or the peer doesn't support it,
// it returns "" and no error.
func negotiateALPN(serverProtos, clientProtos []string) (string, error) {
if len(serverProtos) == 0 || len(clientProtos) == 0 {
return "", nil
}
var http11fallback bool
for _, s := range serverProtos {
for _, c := range clientProtos {
if s == c {
return s, nil
}
if s == "h2" && c == "http/1.1" {
http11fallback = true
}
}
}
// As a special case, let http/1.1 clients connect to h2 servers as if they
// didn't support ALPN. We used not to enforce protocol overlap, so over
// time a number of HTTP servers were configured with only "h2", but
// expected to accept connections from "http/1.1" clients. See Issue 46310.
if http11fallback {
return "", nil
}
return "", fmt.Errorf("tls: client requested unsupported application protocols (%s)", clientProtos)
}
// supportsECDHE returns whether ECDHE key exchanges can be used with this
// pre-TLS 1.3 client.
func supportsECDHE(c *Config, supportedCurves []CurveID, supportedPoints []uint8) bool {
supportsCurve := false
for _, curve := range supportedCurves {
if c.supportsCurve(curve) {
supportsCurve = true
break
}
}
supportsPointFormat := false
for _, pointFormat := range supportedPoints {
if pointFormat == pointFormatUncompressed {
supportsPointFormat = true
break
}
}
// Per RFC 8422, Section 5.1.2, if the Supported Point Formats extension is
// missing, uncompressed points are supported. If supportedPoints is empty,
// the extension must be missing, as an empty extension body is rejected by
// the parser. See https://go.dev/issue/49126.
if len(supportedPoints) == 0 {
supportsPointFormat = true
}
return supportsCurve && supportsPointFormat
}
func (hs *serverHandshakeState) pickCipherSuite() error {
c := hs.c
preferenceOrder := cipherSuitesPreferenceOrder
if !hasAESGCMHardwareSupport || !aesgcmPreferred(hs.clientHello.cipherSuites) {
preferenceOrder = cipherSuitesPreferenceOrderNoAES
}
configCipherSuites := c.config.cipherSuites()
preferenceList := make([]uint16, 0, len(configCipherSuites))
for _, suiteID := range preferenceOrder {
for _, id := range configCipherSuites {
if id == suiteID {
preferenceList = append(preferenceList, id)
break
}
}
}
hs.suite = selectCipherSuite(preferenceList, hs.clientHello.cipherSuites, hs.cipherSuiteOk)
if hs.suite == nil {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: no cipher suite supported by both client and server")
}
c.cipherSuite = hs.suite.id
for _, id := range hs.clientHello.cipherSuites {
if id == TLS_FALLBACK_SCSV {
// The client is doing a fallback connection. See RFC 7507.
if hs.clientHello.vers < c.config.maxSupportedVersion(roleServer) {
c.sendAlert(alertInappropriateFallback)
return errors.New("tls: client using inappropriate protocol fallback")
}
break
}
}
return nil
}
func (hs *serverHandshakeState) cipherSuiteOk(c *cipherSuite) bool {
if c.flags&suiteECDHE != 0 {
if !hs.ecdheOk {
return false
}
if c.flags&suiteECSign != 0 {
if !hs.ecSignOk {
return false
}
} else if !hs.rsaSignOk {
return false
}
} else if !hs.rsaDecryptOk {
return false
}
if hs.c.vers < VersionTLS12 && c.flags&suiteTLS12 != 0 {
return false
}
return true
}
// checkForResumption reports whether we should perform resumption on this connection.
func (hs *serverHandshakeState) checkForResumption() bool {
c := hs.c
if c.config.SessionTicketsDisabled {
return false
}
plaintext, usedOldKey := c.decryptTicket(hs.clientHello.sessionTicket)
if plaintext == nil {
return false
}
hs.sessionState = &sessionState{usedOldKey: usedOldKey}
ok := hs.sessionState.unmarshal(plaintext)
if !ok {
return false
}
createdAt := time.Unix(int64(hs.sessionState.createdAt), 0)
if c.config.time().Sub(createdAt) > maxSessionTicketLifetime {
return false
}
// Never resume a session for a different TLS version.
if c.vers != hs.sessionState.vers {
return false
}
cipherSuiteOk := false
// Check that the client is still offering the ciphersuite in the session.
for _, id := range hs.clientHello.cipherSuites {
if id == hs.sessionState.cipherSuite {
cipherSuiteOk = true
break
}
}
if !cipherSuiteOk {
return false
}
// Check that we also support the ciphersuite from the session.
hs.suite = selectCipherSuite([]uint16{hs.sessionState.cipherSuite},
c.config.cipherSuites(), hs.cipherSuiteOk)
if hs.suite == nil {
return false
}
sessionHasClientCerts := len(hs.sessionState.certificates) != 0
needClientCerts := requiresClientCert(c.config.ClientAuth)
if needClientCerts && !sessionHasClientCerts {
return false
}
if sessionHasClientCerts && c.config.ClientAuth == NoClientCert {
return false
}
return true
}
func (hs *serverHandshakeState) doResumeHandshake() error {
c := hs.c
hs.hello.cipherSuite = hs.suite.id
c.cipherSuite = hs.suite.id
// We echo the client's session ID in the ServerHello to let it know
// that we're doing a resumption.
hs.hello.sessionId = hs.clientHello.sessionId
hs.hello.ticketSupported = hs.sessionState.usedOldKey
hs.finishedHash = newFinishedHash(c.vers, hs.suite)
hs.finishedHash.discardHandshakeBuffer()
hs.finishedHash.Write(hs.clientHello.marshal())
hs.finishedHash.Write(hs.hello.marshal())
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
return err
}
if err := c.processCertsFromClient(Certificate{
Certificate: hs.sessionState.certificates,
}); err != nil {
return err
}
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
hs.masterSecret = hs.sessionState.masterSecret
return nil
}
func (hs *serverHandshakeState) doFullHandshake() error {
c := hs.c
if hs.clientHello.ocspStapling && len(hs.cert.OCSPStaple) > 0 {
hs.hello.ocspStapling = true
}
hs.hello.ticketSupported = hs.clientHello.ticketSupported && !c.config.SessionTicketsDisabled
hs.hello.cipherSuite = hs.suite.id
hs.finishedHash = newFinishedHash(hs.c.vers, hs.suite)
if c.config.ClientAuth == NoClientCert {
// No need to keep a full record of the handshake if client
// certificates won't be used.
hs.finishedHash.discardHandshakeBuffer()
}
hs.finishedHash.Write(hs.clientHello.marshal())
hs.finishedHash.Write(hs.hello.marshal())
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
return err
}
certMsg := new(certificateMsg)
certMsg.certificates = hs.cert.Certificate
hs.finishedHash.Write(certMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certMsg.marshal()); err != nil {
return err
}
if hs.hello.ocspStapling {
certStatus := new(certificateStatusMsg)
certStatus.response = hs.cert.OCSPStaple
hs.finishedHash.Write(certStatus.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certStatus.marshal()); err != nil {
return err
}
}
keyAgreement := hs.suite.ka(c.vers)
skx, err := keyAgreement.generateServerKeyExchange(c.config, hs.cert, hs.clientHello, hs.hello)
if err != nil {
c.sendAlert(alertHandshakeFailure)
return err
}
if skx != nil {
hs.finishedHash.Write(skx.marshal())
if _, err := c.writeRecord(recordTypeHandshake, skx.marshal()); err != nil {
return err
}
}
var certReq *certificateRequestMsg
if c.config.ClientAuth >= RequestClientCert {
// Request a client certificate
certReq = new(certificateRequestMsg)
certReq.certificateTypes = []byte{
byte(certTypeRSASign),
byte(certTypeECDSASign),
}
if c.vers >= VersionTLS12 {
certReq.hasSignatureAlgorithm = true
certReq.supportedSignatureAlgorithms = supportedSignatureAlgorithms()
}
// An empty list of certificateAuthorities signals to
// the client that it may send any certificate in response
// to our request. When we know the CAs we trust, then
// we can send them down, so that the client can choose
// an appropriate certificate to give to us.
if c.config.ClientCAs != nil {
certReq.certificateAuthorities = c.config.ClientCAs.Subjects()
}
hs.finishedHash.Write(certReq.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certReq.marshal()); err != nil {
return err
}
}
helloDone := new(serverHelloDoneMsg)
hs.finishedHash.Write(helloDone.marshal())
if _, err := c.writeRecord(recordTypeHandshake, helloDone.marshal()); err != nil {
return err
}
if _, err := c.flush(); err != nil {
return err
}
var pub crypto.PublicKey // public key for client auth, if any
msg, err := c.readHandshake()
if err != nil {
return err
}
// If we requested a client certificate, then the client must send a
// certificate message, even if it's empty.
if c.config.ClientAuth >= RequestClientCert {
certMsg, ok := msg.(*certificateMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certMsg, msg)
}
hs.finishedHash.Write(certMsg.marshal())
if err := c.processCertsFromClient(Certificate{
Certificate: certMsg.certificates,
}); err != nil {
return err
}
if len(certMsg.certificates) != 0 {
pub = c.peerCertificates[0].PublicKey
}
msg, err = c.readHandshake()
if err != nil {
return err
}
}
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
// Get client key exchange
ckx, ok := msg.(*clientKeyExchangeMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(ckx, msg)
}
hs.finishedHash.Write(ckx.marshal())
preMasterSecret, err := keyAgreement.processClientKeyExchange(c.config, hs.cert, ckx, c.vers)
if err != nil {
c.sendAlert(alertHandshakeFailure)
return err
}
hs.masterSecret = masterFromPreMasterSecret(c.vers, hs.suite, preMasterSecret, hs.clientHello.random, hs.hello.random)
if err := c.config.writeKeyLog(keyLogLabelTLS12, hs.clientHello.random, hs.masterSecret); err != nil {
c.sendAlert(alertInternalError)
return err
}
// If we received a client cert in response to our certificate request message,
// the client will send us a certificateVerifyMsg immediately after the
// clientKeyExchangeMsg. This message is a digest of all preceding
// handshake-layer messages that is signed using the private key corresponding
// to the client's certificate. This allows us to verify that the client is in
// possession of the private key of the certificate.
if len(c.peerCertificates) > 0 {
msg, err = c.readHandshake()
if err != nil {
return err
}
certVerify, ok := msg.(*certificateVerifyMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certVerify, msg)
}
var sigType uint8
var sigHash crypto.Hash
if c.vers >= VersionTLS12 {
if !isSupportedSignatureAlgorithm(certVerify.signatureAlgorithm, certReq.supportedSignatureAlgorithms) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client certificate used with invalid signature algorithm")
}
sigType, sigHash, err = typeAndHashFromSignatureScheme(certVerify.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
} else {
sigType, sigHash, err = legacyTypeAndHashFromPublicKey(pub)
if err != nil {
c.sendAlert(alertIllegalParameter)
return err
}
}
signed := hs.finishedHash.hashForClientCertificate(sigType, sigHash, hs.masterSecret)
if err := verifyHandshakeSignature(sigType, pub, sigHash, signed, certVerify.signature); err != nil {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid signature by the client certificate: " + err.Error())
}
hs.finishedHash.Write(certVerify.marshal())
}
hs.finishedHash.discardHandshakeBuffer()
return nil
}
func (hs *serverHandshakeState) establishKeys() error {
c := hs.c
clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV := keysFromMasterSecret(c.vers, hs.suite, hs.masterSecret, hs.clientHello.random, hs.hello.random, hs.suite.macLen, hs.suite.keyLen, hs.suite.ivLen)
var clientCipher, serverCipher any
var clientHash, serverHash hash.Hash
if hs.suite.aead == nil {
clientCipher = hs.suite.cipher(clientKey, clientIV, true /* for reading */)
clientHash = hs.suite.mac(clientMAC)
serverCipher = hs.suite.cipher(serverKey, serverIV, false /* not for reading */)
serverHash = hs.suite.mac(serverMAC)
} else {
clientCipher = hs.suite.aead(clientKey, clientIV)
serverCipher = hs.suite.aead(serverKey, serverIV)
}
c.in.prepareCipherSpec(c.vers, clientCipher, clientHash)
c.out.prepareCipherSpec(c.vers, serverCipher, serverHash)
return nil
}
func (hs *serverHandshakeState) readFinished(out []byte) error {
c := hs.c
if err := c.readChangeCipherSpec(); err != nil {
return err
}
msg, err := c.readHandshake()
if err != nil {
return err
}
clientFinished, ok := msg.(*finishedMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(clientFinished, msg)
}
verify := hs.finishedHash.clientSum(hs.masterSecret)
if len(verify) != len(clientFinished.verifyData) ||
subtle.ConstantTimeCompare(verify, clientFinished.verifyData) != 1 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: client's Finished message is incorrect")
}
hs.finishedHash.Write(clientFinished.marshal())
copy(out, verify)
return nil
}
func (hs *serverHandshakeState) sendSessionTicket() error {
// ticketSupported is set in a resumption handshake if the
// ticket from the client was encrypted with an old session
// ticket key and thus a refreshed ticket should be sent.
if !hs.hello.ticketSupported {
return nil
}
c := hs.c
m := new(newSessionTicketMsg)
createdAt := uint64(c.config.time().Unix())
if hs.sessionState != nil {
// If this is re-wrapping an old key, then keep
// the original time it was created.
createdAt = hs.sessionState.createdAt
}
var certsFromClient [][]byte
for _, cert := range c.peerCertificates {
certsFromClient = append(certsFromClient, cert.Raw)
}
state := sessionState{
vers: c.vers,
cipherSuite: hs.suite.id,
createdAt: createdAt,
masterSecret: hs.masterSecret,
certificates: certsFromClient,
}
var err error
m.ticket, err = c.encryptTicket(state.marshal())
if err != nil {
return err
}
hs.finishedHash.Write(m.marshal())
if _, err := c.writeRecord(recordTypeHandshake, m.marshal()); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeState) sendFinished(out []byte) error {
c := hs.c
if _, err := c.writeRecord(recordTypeChangeCipherSpec, []byte{1}); err != nil {
return err
}
finished := new(finishedMsg)
finished.verifyData = hs.finishedHash.serverSum(hs.masterSecret)
hs.finishedHash.Write(finished.marshal())
if _, err := c.writeRecord(recordTypeHandshake, finished.marshal()); err != nil {
return err
}
copy(out, finished.verifyData)
return nil
}
// processCertsFromClient takes a chain of client certificates either from a
// Certificates message or from a sessionState and verifies them. It returns
// the public key of the leaf certificate.
func (c *Conn) processCertsFromClient(certificate Certificate) error {
certificates := certificate.Certificate
certs := make([]*x509.Certificate, len(certificates))
var err error
for i, asn1Data := range certificates {
if certs[i], err = x509.ParseCertificate(asn1Data); err != nil {
c.sendAlert(alertBadCertificate)
return errors.New("tls: failed to parse client certificate: " + err.Error())
}
}
if len(certs) == 0 && requiresClientCert(c.config.ClientAuth) {
c.sendAlert(alertBadCertificate)
return errors.New("tls: client didn't provide a certificate")
}
if c.config.ClientAuth >= VerifyClientCertIfGiven && len(certs) > 0 {
opts := x509.VerifyOptions{
Roots: c.config.ClientCAs,
CurrentTime: c.config.time(),
Intermediates: x509.NewCertPool(),
KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageClientAuth},
}
for _, cert := range certs[1:] {
opts.Intermediates.AddCert(cert)
}
chains, err := certs[0].Verify(opts)
if err != nil {
c.sendAlert(alertBadCertificate)
return errors.New("tls: failed to verify client certificate: " + err.Error())
}
c.verifiedChains = chains
}
c.peerCertificates = certs
c.ocspResponse = certificate.OCSPStaple
c.scts = certificate.SignedCertificateTimestamps
if len(certs) > 0 {
switch certs[0].PublicKey.(type) {
case *ecdsa.PublicKey, *rsa.PublicKey, ed25519.PublicKey:
default:
c.sendAlert(alertUnsupportedCertificate)
return fmt.Errorf("tls: client certificate contains an unsupported public key of type %T", certs[0].PublicKey)
}
}
if c.config.VerifyPeerCertificate != nil {
if err := c.config.VerifyPeerCertificate(certificates, c.verifiedChains); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
return nil
}
func clientHelloInfo(ctx context.Context, c *Conn, clientHello *clientHelloMsg) *ClientHelloInfo {
supportedVersions := clientHello.supportedVersions
if len(clientHello.supportedVersions) == 0 {
supportedVersions = supportedVersionsFromMax(clientHello.vers)
}
return &ClientHelloInfo{
CipherSuites: clientHello.cipherSuites,
ServerName: clientHello.serverName,
SupportedCurves: clientHello.supportedCurves,
SupportedPoints: clientHello.supportedPoints,
SignatureSchemes: clientHello.supportedSignatureAlgorithms,
SupportedProtos: clientHello.alpnProtocols,
SupportedVersions: supportedVersions,
Conn: c.conn,
config: c.config,
ctx: ctx,
}
}

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transport/shadowtls/tls_go119/handshake_server_tls13.go Normal file
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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"bytes"
"context"
"crypto"
"crypto/hmac"
"crypto/rsa"
"encoding/binary"
"errors"
"hash"
"io"
"sync/atomic"
"time"
)
// maxClientPSKIdentities is the number of client PSK identities the server will
// attempt to validate. It will ignore the rest not to let cheap ClientHello
// messages cause too much work in session ticket decryption attempts.
const maxClientPSKIdentities = 5
type serverHandshakeStateTLS13 struct {
c *Conn
ctx context.Context
clientHello *clientHelloMsg
hello *serverHelloMsg
sentDummyCCS bool
usingPSK bool
suite *cipherSuiteTLS13
cert *Certificate
sigAlg SignatureScheme
earlySecret []byte
sharedKey []byte
handshakeSecret []byte
masterSecret []byte
trafficSecret []byte // client_application_traffic_secret_0
transcript hash.Hash
clientFinished []byte
}
func (hs *serverHandshakeStateTLS13) handshake() error {
c := hs.c
if needFIPS() {
return errors.New("tls: internal error: TLS 1.3 reached in FIPS mode")
}
// For an overview of the TLS 1.3 handshake, see RFC 8446, Section 2.
if err := hs.processClientHello(); err != nil {
return err
}
if err := hs.checkForResumption(); err != nil {
return err
}
if err := hs.pickCertificate(); err != nil {
return err
}
c.buffering = true
if err := hs.sendServerParameters(); err != nil {
return err
}
if err := hs.sendServerCertificate(); err != nil {
return err
}
if err := hs.sendServerFinished(); err != nil {
return err
}
// Note that at this point we could start sending application data without
// waiting for the client's second flight, but the application might not
// expect the lack of replay protection of the ClientHello parameters.
if _, err := c.flush(); err != nil {
return err
}
if err := hs.readClientCertificate(); err != nil {
return err
}
if err := hs.readClientFinished(); err != nil {
return err
}
atomic.StoreUint32(&c.handshakeStatus, 1)
return nil
}
func (hs *serverHandshakeStateTLS13) processClientHello() error {
c := hs.c
hs.hello = new(serverHelloMsg)
// TLS 1.3 froze the ServerHello.legacy_version field, and uses
// supported_versions instead. See RFC 8446, sections 4.1.3 and 4.2.1.
hs.hello.vers = VersionTLS12
hs.hello.supportedVersion = c.vers
if len(hs.clientHello.supportedVersions) == 0 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client used the legacy version field to negotiate TLS 1.3")
}
// Abort if the client is doing a fallback and landing lower than what we
// support. See RFC 7507, which however does not specify the interaction
// with supported_versions. The only difference is that with
// supported_versions a client has a chance to attempt a [TLS 1.2, TLS 1.4]
// handshake in case TLS 1.3 is broken but 1.2 is not. Alas, in that case,
// it will have to drop the TLS_FALLBACK_SCSV protection if it falls back to
// TLS 1.2, because a TLS 1.3 server would abort here. The situation before
// supported_versions was not better because there was just no way to do a
// TLS 1.4 handshake without risking the server selecting TLS 1.3.
for _, id := range hs.clientHello.cipherSuites {
if id == TLS_FALLBACK_SCSV {
// Use c.vers instead of max(supported_versions) because an attacker
// could defeat this by adding an arbitrary high version otherwise.
if c.vers < c.config.maxSupportedVersion(roleServer) {
c.sendAlert(alertInappropriateFallback)
return errors.New("tls: client using inappropriate protocol fallback")
}
break
}
}
if len(hs.clientHello.compressionMethods) != 1 ||
hs.clientHello.compressionMethods[0] != compressionNone {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: TLS 1.3 client supports illegal compression methods")
}
hs.hello.random = make([]byte, 32)
if _, err := io.ReadFull(c.config.rand(), hs.hello.random); err != nil {
c.sendAlert(alertInternalError)
return err
}
if len(hs.clientHello.secureRenegotiation) != 0 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: initial handshake had non-empty renegotiation extension")
}
if hs.clientHello.earlyData {
// See RFC 8446, Section 4.2.10 for the complicated behavior required
// here. The scenario is that a different server at our address offered
// to accept early data in the past, which we can't handle. For now, all
// 0-RTT enabled session tickets need to expire before a Go server can
// replace a server or join a pool. That's the same requirement that
// applies to mixing or replacing with any TLS 1.2 server.
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: client sent unexpected early data")
}
hs.hello.sessionId = hs.clientHello.sessionId
hs.hello.compressionMethod = compressionNone
preferenceList := defaultCipherSuitesTLS13
if !hasAESGCMHardwareSupport || !aesgcmPreferred(hs.clientHello.cipherSuites) {
preferenceList = defaultCipherSuitesTLS13NoAES
}
for _, suiteID := range preferenceList {
hs.suite = mutualCipherSuiteTLS13(hs.clientHello.cipherSuites, suiteID)
if hs.suite != nil {
break
}
}
if hs.suite == nil {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: no cipher suite supported by both client and server")
}
c.cipherSuite = hs.suite.id
hs.hello.cipherSuite = hs.suite.id
hs.transcript = hs.suite.hash.New()
// Pick the ECDHE group in server preference order, but give priority to
// groups with a key share, to avoid a HelloRetryRequest round-trip.
var selectedGroup CurveID
var clientKeyShare *keyShare
GroupSelection:
for _, preferredGroup := range c.config.curvePreferences() {
for _, ks := range hs.clientHello.keyShares {
if ks.group == preferredGroup {
selectedGroup = ks.group
clientKeyShare = &ks
break GroupSelection
}
}
if selectedGroup != 0 {
continue
}
for _, group := range hs.clientHello.supportedCurves {
if group == preferredGroup {
selectedGroup = group
break
}
}
}
if selectedGroup == 0 {
c.sendAlert(alertHandshakeFailure)
return errors.New("tls: no ECDHE curve supported by both client and server")
}
if clientKeyShare == nil {
if err := hs.doHelloRetryRequest(selectedGroup); err != nil {
return err
}
clientKeyShare = &hs.clientHello.keyShares[0]
}
if _, ok := curveForCurveID(selectedGroup); selectedGroup != X25519 && !ok {
c.sendAlert(alertInternalError)
return errors.New("tls: CurvePreferences includes unsupported curve")
}
params, err := generateECDHEParameters(c.config.rand(), selectedGroup)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
hs.hello.serverShare = keyShare{group: selectedGroup, data: params.PublicKey()}
hs.sharedKey = params.SharedKey(clientKeyShare.data)
if hs.sharedKey == nil {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid client key share")
}
c.serverName = hs.clientHello.serverName
return nil
}
func (hs *serverHandshakeStateTLS13) checkForResumption() error {
c := hs.c
if c.config.SessionTicketsDisabled {
return nil
}
modeOK := false
for _, mode := range hs.clientHello.pskModes {
if mode == pskModeDHE {
modeOK = true
break
}
}
if !modeOK {
return nil
}
if len(hs.clientHello.pskIdentities) != len(hs.clientHello.pskBinders) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: invalid or missing PSK binders")
}
if len(hs.clientHello.pskIdentities) == 0 {
return nil
}
for i, identity := range hs.clientHello.pskIdentities {
if i >= maxClientPSKIdentities {
break
}
plaintext, _ := c.decryptTicket(identity.label)
if plaintext == nil {
continue
}
sessionState := new(sessionStateTLS13)
if ok := sessionState.unmarshal(plaintext); !ok {
continue
}
createdAt := time.Unix(int64(sessionState.createdAt), 0)
if c.config.time().Sub(createdAt) > maxSessionTicketLifetime {
continue
}
// We don't check the obfuscated ticket age because it's affected by
// clock skew and it's only a freshness signal useful for shrinking the
// window for replay attacks, which don't affect us as we don't do 0-RTT.
pskSuite := cipherSuiteTLS13ByID(sessionState.cipherSuite)
if pskSuite == nil || pskSuite.hash != hs.suite.hash {
continue
}
// PSK connections don't re-establish client certificates, but carry
// them over in the session ticket. Ensure the presence of client certs
// in the ticket is consistent with the configured requirements.
sessionHasClientCerts := len(sessionState.certificate.Certificate) != 0
needClientCerts := requiresClientCert(c.config.ClientAuth)
if needClientCerts && !sessionHasClientCerts {
continue
}
if sessionHasClientCerts && c.config.ClientAuth == NoClientCert {
continue
}
psk := hs.suite.expandLabel(sessionState.resumptionSecret, "resumption",
nil, hs.suite.hash.Size())
hs.earlySecret = hs.suite.extract(psk, nil)
binderKey := hs.suite.deriveSecret(hs.earlySecret, resumptionBinderLabel, nil)
// Clone the transcript in case a HelloRetryRequest was recorded.
transcript := cloneHash(hs.transcript, hs.suite.hash)
if transcript == nil {
c.sendAlert(alertInternalError)
return errors.New("tls: internal error: failed to clone hash")
}
transcript.Write(hs.clientHello.marshalWithoutBinders())
pskBinder := hs.suite.finishedHash(binderKey, transcript)
if !hmac.Equal(hs.clientHello.pskBinders[i], pskBinder) {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid PSK binder")
}
c.didResume = true
if err := c.processCertsFromClient(sessionState.certificate); err != nil {
return err
}
hs.hello.selectedIdentityPresent = true
hs.hello.selectedIdentity = uint16(i)
hs.usingPSK = true
return nil
}
return nil
}
// cloneHash uses the encoding.BinaryMarshaler and encoding.BinaryUnmarshaler
// interfaces implemented by standard library hashes to clone the state of in
// to a new instance of h. It returns nil if the operation fails.
func cloneHash(in hash.Hash, h crypto.Hash) hash.Hash {
// Recreate the interface to avoid importing encoding.
type binaryMarshaler interface {
MarshalBinary() (data []byte, err error)
UnmarshalBinary(data []byte) error
}
marshaler, ok := in.(binaryMarshaler)
if !ok {
return nil
}
state, err := marshaler.MarshalBinary()
if err != nil {
return nil
}
out := h.New()
unmarshaler, ok := out.(binaryMarshaler)
if !ok {
return nil
}
if err := unmarshaler.UnmarshalBinary(state); err != nil {
return nil
}
return out
}
func (hs *serverHandshakeStateTLS13) pickCertificate() error {
c := hs.c
// Only one of PSK and certificates are used at a time.
if hs.usingPSK {
return nil
}
// signature_algorithms is required in TLS 1.3. See RFC 8446, Section 4.2.3.
if len(hs.clientHello.supportedSignatureAlgorithms) == 0 {
return c.sendAlert(alertMissingExtension)
}
certificate, err := c.config.getCertificate(clientHelloInfo(hs.ctx, c, hs.clientHello))
if err != nil {
if err == errNoCertificates {
c.sendAlert(alertUnrecognizedName)
} else {
c.sendAlert(alertInternalError)
}
return err
}
hs.sigAlg, err = selectSignatureScheme(c.vers, certificate, hs.clientHello.supportedSignatureAlgorithms)
if err != nil {
// getCertificate returned a certificate that is unsupported or
// incompatible with the client's signature algorithms.
c.sendAlert(alertHandshakeFailure)
return err
}
hs.cert = certificate
return nil
}
// sendDummyChangeCipherSpec sends a ChangeCipherSpec record for compatibility
// with middleboxes that didn't implement TLS correctly. See RFC 8446, Appendix D.4.
func (hs *serverHandshakeStateTLS13) sendDummyChangeCipherSpec() error {
if hs.sentDummyCCS {
return nil
}
hs.sentDummyCCS = true
_, err := hs.c.writeRecord(recordTypeChangeCipherSpec, []byte{1})
return err
}
func (hs *serverHandshakeStateTLS13) doHelloRetryRequest(selectedGroup CurveID) error {
c := hs.c
// The first ClientHello gets double-hashed into the transcript upon a
// HelloRetryRequest. See RFC 8446, Section 4.4.1.
hs.transcript.Write(hs.clientHello.marshal())
chHash := hs.transcript.Sum(nil)
hs.transcript.Reset()
hs.transcript.Write([]byte{typeMessageHash, 0, 0, uint8(len(chHash))})
hs.transcript.Write(chHash)
helloRetryRequest := &serverHelloMsg{
vers: hs.hello.vers,
random: helloRetryRequestRandom,
sessionId: hs.hello.sessionId,
cipherSuite: hs.hello.cipherSuite,
compressionMethod: hs.hello.compressionMethod,
supportedVersion: hs.hello.supportedVersion,
selectedGroup: selectedGroup,
}
hs.transcript.Write(helloRetryRequest.marshal())
if _, err := c.writeRecord(recordTypeHandshake, helloRetryRequest.marshal()); err != nil {
return err
}
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
msg, err := c.readHandshake()
if err != nil {
return err
}
clientHello, ok := msg.(*clientHelloMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(clientHello, msg)
}
if len(clientHello.keyShares) != 1 || clientHello.keyShares[0].group != selectedGroup {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client sent invalid key share in second ClientHello")
}
if clientHello.earlyData {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client indicated early data in second ClientHello")
}
if illegalClientHelloChange(clientHello, hs.clientHello) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client illegally modified second ClientHello")
}
hs.clientHello = clientHello
return nil
}
// illegalClientHelloChange reports whether the two ClientHello messages are
// different, with the exception of the changes allowed before and after a
// HelloRetryRequest. See RFC 8446, Section 4.1.2.
func illegalClientHelloChange(ch, ch1 *clientHelloMsg) bool {
if len(ch.supportedVersions) != len(ch1.supportedVersions) ||
len(ch.cipherSuites) != len(ch1.cipherSuites) ||
len(ch.supportedCurves) != len(ch1.supportedCurves) ||
len(ch.supportedSignatureAlgorithms) != len(ch1.supportedSignatureAlgorithms) ||
len(ch.supportedSignatureAlgorithmsCert) != len(ch1.supportedSignatureAlgorithmsCert) ||
len(ch.alpnProtocols) != len(ch1.alpnProtocols) {
return true
}
for i := range ch.supportedVersions {
if ch.supportedVersions[i] != ch1.supportedVersions[i] {
return true
}
}
for i := range ch.cipherSuites {
if ch.cipherSuites[i] != ch1.cipherSuites[i] {
return true
}
}
for i := range ch.supportedCurves {
if ch.supportedCurves[i] != ch1.supportedCurves[i] {
return true
}
}
for i := range ch.supportedSignatureAlgorithms {
if ch.supportedSignatureAlgorithms[i] != ch1.supportedSignatureAlgorithms[i] {
return true
}
}
for i := range ch.supportedSignatureAlgorithmsCert {
if ch.supportedSignatureAlgorithmsCert[i] != ch1.supportedSignatureAlgorithmsCert[i] {
return true
}
}
for i := range ch.alpnProtocols {
if ch.alpnProtocols[i] != ch1.alpnProtocols[i] {
return true
}
}
return ch.vers != ch1.vers ||
!bytes.Equal(ch.random, ch1.random) ||
!bytes.Equal(ch.sessionId, ch1.sessionId) ||
!bytes.Equal(ch.compressionMethods, ch1.compressionMethods) ||
ch.serverName != ch1.serverName ||
ch.ocspStapling != ch1.ocspStapling ||
!bytes.Equal(ch.supportedPoints, ch1.supportedPoints) ||
ch.ticketSupported != ch1.ticketSupported ||
!bytes.Equal(ch.sessionTicket, ch1.sessionTicket) ||
ch.secureRenegotiationSupported != ch1.secureRenegotiationSupported ||
!bytes.Equal(ch.secureRenegotiation, ch1.secureRenegotiation) ||
ch.scts != ch1.scts ||
!bytes.Equal(ch.cookie, ch1.cookie) ||
!bytes.Equal(ch.pskModes, ch1.pskModes)
}
func (hs *serverHandshakeStateTLS13) sendServerParameters() error {
c := hs.c
hs.transcript.Write(hs.clientHello.marshal())
hs.transcript.Write(hs.hello.marshal())
if _, err := c.writeRecord(recordTypeHandshake, hs.hello.marshal()); err != nil {
return err
}
if err := hs.sendDummyChangeCipherSpec(); err != nil {
return err
}
earlySecret := hs.earlySecret
if earlySecret == nil {
earlySecret = hs.suite.extract(nil, nil)
}
hs.handshakeSecret = hs.suite.extract(hs.sharedKey,
hs.suite.deriveSecret(earlySecret, "derived", nil))
clientSecret := hs.suite.deriveSecret(hs.handshakeSecret,
clientHandshakeTrafficLabel, hs.transcript)
c.in.setTrafficSecret(hs.suite, clientSecret)
serverSecret := hs.suite.deriveSecret(hs.handshakeSecret,
serverHandshakeTrafficLabel, hs.transcript)
c.out.setTrafficSecret(hs.suite, serverSecret)
err := c.config.writeKeyLog(keyLogLabelClientHandshake, hs.clientHello.random, clientSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerHandshake, hs.clientHello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
encryptedExtensions := new(encryptedExtensionsMsg)
selectedProto, err := negotiateALPN(c.config.NextProtos, hs.clientHello.alpnProtocols)
if err != nil {
c.sendAlert(alertNoApplicationProtocol)
return err
}
encryptedExtensions.alpnProtocol = selectedProto
c.clientProtocol = selectedProto
hs.transcript.Write(encryptedExtensions.marshal())
if _, err := c.writeRecord(recordTypeHandshake, encryptedExtensions.marshal()); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) requestClientCert() bool {
return hs.c.config.ClientAuth >= RequestClientCert && !hs.usingPSK
}
func (hs *serverHandshakeStateTLS13) sendServerCertificate() error {
c := hs.c
// Only one of PSK and certificates are used at a time.
if hs.usingPSK {
return nil
}
if hs.requestClientCert() {
// Request a client certificate
certReq := new(certificateRequestMsgTLS13)
certReq.ocspStapling = true
certReq.scts = true
certReq.supportedSignatureAlgorithms = supportedSignatureAlgorithms()
if c.config.ClientCAs != nil {
certReq.certificateAuthorities = c.config.ClientCAs.Subjects()
}
hs.transcript.Write(certReq.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certReq.marshal()); err != nil {
return err
}
}
certMsg := new(certificateMsgTLS13)
certMsg.certificate = *hs.cert
certMsg.scts = hs.clientHello.scts && len(hs.cert.SignedCertificateTimestamps) > 0
certMsg.ocspStapling = hs.clientHello.ocspStapling && len(hs.cert.OCSPStaple) > 0
hs.transcript.Write(certMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certMsg.marshal()); err != nil {
return err
}
certVerifyMsg := new(certificateVerifyMsg)
certVerifyMsg.hasSignatureAlgorithm = true
certVerifyMsg.signatureAlgorithm = hs.sigAlg
sigType, sigHash, err := typeAndHashFromSignatureScheme(hs.sigAlg)
if err != nil {
return c.sendAlert(alertInternalError)
}
signed := signedMessage(sigHash, serverSignatureContext, hs.transcript)
signOpts := crypto.SignerOpts(sigHash)
if sigType == signatureRSAPSS {
signOpts = &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash, Hash: sigHash}
}
sig, err := hs.cert.PrivateKey.(crypto.Signer).Sign(c.config.rand(), signed, signOpts)
if err != nil {
public := hs.cert.PrivateKey.(crypto.Signer).Public()
if rsaKey, ok := public.(*rsa.PublicKey); ok && sigType == signatureRSAPSS &&
rsaKey.N.BitLen()/8 < sigHash.Size()*2+2 { // key too small for RSA-PSS
c.sendAlert(alertHandshakeFailure)
} else {
c.sendAlert(alertInternalError)
}
return errors.New("tls: failed to sign handshake: " + err.Error())
}
certVerifyMsg.signature = sig
hs.transcript.Write(certVerifyMsg.marshal())
if _, err := c.writeRecord(recordTypeHandshake, certVerifyMsg.marshal()); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) sendServerFinished() error {
c := hs.c
finished := &finishedMsg{
verifyData: hs.suite.finishedHash(c.out.trafficSecret, hs.transcript),
}
hs.transcript.Write(finished.marshal())
if _, err := c.writeRecord(recordTypeHandshake, finished.marshal()); err != nil {
return err
}
// Derive secrets that take context through the server Finished.
hs.masterSecret = hs.suite.extract(nil,
hs.suite.deriveSecret(hs.handshakeSecret, "derived", nil))
hs.trafficSecret = hs.suite.deriveSecret(hs.masterSecret,
clientApplicationTrafficLabel, hs.transcript)
serverSecret := hs.suite.deriveSecret(hs.masterSecret,
serverApplicationTrafficLabel, hs.transcript)
c.out.setTrafficSecret(hs.suite, serverSecret)
err := c.config.writeKeyLog(keyLogLabelClientTraffic, hs.clientHello.random, hs.trafficSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
err = c.config.writeKeyLog(keyLogLabelServerTraffic, hs.clientHello.random, serverSecret)
if err != nil {
c.sendAlert(alertInternalError)
return err
}
c.ekm = hs.suite.exportKeyingMaterial(hs.masterSecret, hs.transcript)
// If we did not request client certificates, at this point we can
// precompute the client finished and roll the transcript forward to send
// session tickets in our first flight.
if !hs.requestClientCert() {
if err := hs.sendSessionTickets(); err != nil {
return err
}
}
return nil
}
func (hs *serverHandshakeStateTLS13) shouldSendSessionTickets() bool {
if hs.c.config.SessionTicketsDisabled {
return false
}
// Don't send tickets the client wouldn't use. See RFC 8446, Section 4.2.9.
for _, pskMode := range hs.clientHello.pskModes {
if pskMode == pskModeDHE {
return true
}
}
return false
}
func (hs *serverHandshakeStateTLS13) sendSessionTickets() error {
c := hs.c
hs.clientFinished = hs.suite.finishedHash(c.in.trafficSecret, hs.transcript)
finishedMsg := &finishedMsg{
verifyData: hs.clientFinished,
}
hs.transcript.Write(finishedMsg.marshal())
if !hs.shouldSendSessionTickets() {
return nil
}
resumptionSecret := hs.suite.deriveSecret(hs.masterSecret,
resumptionLabel, hs.transcript)
m := new(newSessionTicketMsgTLS13)
var certsFromClient [][]byte
for _, cert := range c.peerCertificates {
certsFromClient = append(certsFromClient, cert.Raw)
}
state := sessionStateTLS13{
cipherSuite: hs.suite.id,
createdAt: uint64(c.config.time().Unix()),
resumptionSecret: resumptionSecret,
certificate: Certificate{
Certificate: certsFromClient,
OCSPStaple: c.ocspResponse,
SignedCertificateTimestamps: c.scts,
},
}
var err error
m.label, err = c.encryptTicket(state.marshal())
if err != nil {
return err
}
m.lifetime = uint32(maxSessionTicketLifetime / time.Second)
// ticket_age_add is a random 32-bit value. See RFC 8446, section 4.6.1
// The value is not stored anywhere; we never need to check the ticket age
// because 0-RTT is not supported.
ageAdd := make([]byte, 4)
_, err = hs.c.config.rand().Read(ageAdd)
if err != nil {
return err
}
m.ageAdd = binary.LittleEndian.Uint32(ageAdd)
// ticket_nonce, which must be unique per connection, is always left at
// zero because we only ever send one ticket per connection.
if _, err := c.writeRecord(recordTypeHandshake, m.marshal()); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) readClientCertificate() error {
c := hs.c
if !hs.requestClientCert() {
// Make sure the connection is still being verified whether or not
// the server requested a client certificate.
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
return nil
}
// If we requested a client certificate, then the client must send a
// certificate message. If it's empty, no CertificateVerify is sent.
msg, err := c.readHandshake()
if err != nil {
return err
}
certMsg, ok := msg.(*certificateMsgTLS13)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certMsg, msg)
}
hs.transcript.Write(certMsg.marshal())
if err := c.processCertsFromClient(certMsg.certificate); err != nil {
return err
}
if c.config.VerifyConnection != nil {
if err := c.config.VerifyConnection(c.connectionStateLocked()); err != nil {
c.sendAlert(alertBadCertificate)
return err
}
}
if len(certMsg.certificate.Certificate) != 0 {
msg, err = c.readHandshake()
if err != nil {
return err
}
certVerify, ok := msg.(*certificateVerifyMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(certVerify, msg)
}
// See RFC 8446, Section 4.4.3.
if !isSupportedSignatureAlgorithm(certVerify.signatureAlgorithm, supportedSignatureAlgorithms()) {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client certificate used with invalid signature algorithm")
}
sigType, sigHash, err := typeAndHashFromSignatureScheme(certVerify.signatureAlgorithm)
if err != nil {
return c.sendAlert(alertInternalError)
}
if sigType == signaturePKCS1v15 || sigHash == crypto.SHA1 {
c.sendAlert(alertIllegalParameter)
return errors.New("tls: client certificate used with invalid signature algorithm")
}
signed := signedMessage(sigHash, clientSignatureContext, hs.transcript)
if err := verifyHandshakeSignature(sigType, c.peerCertificates[0].PublicKey,
sigHash, signed, certVerify.signature); err != nil {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid signature by the client certificate: " + err.Error())
}
hs.transcript.Write(certVerify.marshal())
}
// If we waited until the client certificates to send session tickets, we
// are ready to do it now.
if err := hs.sendSessionTickets(); err != nil {
return err
}
return nil
}
func (hs *serverHandshakeStateTLS13) readClientFinished() error {
c := hs.c
msg, err := c.readHandshake()
if err != nil {
return err
}
finished, ok := msg.(*finishedMsg)
if !ok {
c.sendAlert(alertUnexpectedMessage)
return unexpectedMessageError(finished, msg)
}
if !hmac.Equal(hs.clientFinished, finished.verifyData) {
c.sendAlert(alertDecryptError)
return errors.New("tls: invalid client finished hash")
}
c.in.setTrafficSecret(hs.suite, hs.trafficSecret)
return nil
}

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// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto"
"crypto/md5"
"crypto/rsa"
"crypto/sha1"
"crypto/x509"
"errors"
"fmt"
"io"
)
// a keyAgreement implements the client and server side of a TLS key agreement
// protocol by generating and processing key exchange messages.
type keyAgreement interface {
// On the server side, the first two methods are called in order.
// In the case that the key agreement protocol doesn't use a
// ServerKeyExchange message, generateServerKeyExchange can return nil,
// nil.
generateServerKeyExchange(*Config, *Certificate, *clientHelloMsg, *serverHelloMsg) (*serverKeyExchangeMsg, error)
processClientKeyExchange(*Config, *Certificate, *clientKeyExchangeMsg, uint16) ([]byte, error)
// On the client side, the next two methods are called in order.
// This method may not be called if the server doesn't send a
// ServerKeyExchange message.
processServerKeyExchange(*Config, *clientHelloMsg, *serverHelloMsg, *x509.Certificate, *serverKeyExchangeMsg) error
generateClientKeyExchange(*Config, *clientHelloMsg, *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error)
}
var (
errClientKeyExchange = errors.New("tls: invalid ClientKeyExchange message")
errServerKeyExchange = errors.New("tls: invalid ServerKeyExchange message")
)
// rsaKeyAgreement implements the standard TLS key agreement where the client
// encrypts the pre-master secret to the server's public key.
type rsaKeyAgreement struct{}
func (ka rsaKeyAgreement) generateServerKeyExchange(config *Config, cert *Certificate, clientHello *clientHelloMsg, hello *serverHelloMsg) (*serverKeyExchangeMsg, error) {
return nil, nil
}
func (ka rsaKeyAgreement) processClientKeyExchange(config *Config, cert *Certificate, ckx *clientKeyExchangeMsg, version uint16) ([]byte, error) {
if len(ckx.ciphertext) < 2 {
return nil, errClientKeyExchange
}
ciphertextLen := int(ckx.ciphertext[0])<<8 | int(ckx.ciphertext[1])
if ciphertextLen != len(ckx.ciphertext)-2 {
return nil, errClientKeyExchange
}
ciphertext := ckx.ciphertext[2:]
priv, ok := cert.PrivateKey.(crypto.Decrypter)
if !ok {
return nil, errors.New("tls: certificate private key does not implement crypto.Decrypter")
}
// Perform constant time RSA PKCS #1 v1.5 decryption
preMasterSecret, err := priv.Decrypt(config.rand(), ciphertext, &rsa.PKCS1v15DecryptOptions{SessionKeyLen: 48})
if err != nil {
return nil, err
}
// We don't check the version number in the premaster secret. For one,
// by checking it, we would leak information about the validity of the
// encrypted pre-master secret. Secondly, it provides only a small
// benefit against a downgrade attack and some implementations send the
// wrong version anyway. See the discussion at the end of section
// 7.4.7.1 of RFC 4346.
return preMasterSecret, nil
}
func (ka rsaKeyAgreement) processServerKeyExchange(config *Config, clientHello *clientHelloMsg, serverHello *serverHelloMsg, cert *x509.Certificate, skx *serverKeyExchangeMsg) error {
return errors.New("tls: unexpected ServerKeyExchange")
}
func (ka rsaKeyAgreement) generateClientKeyExchange(config *Config, clientHello *clientHelloMsg, cert *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error) {
preMasterSecret := make([]byte, 48)
preMasterSecret[0] = byte(clientHello.vers >> 8)
preMasterSecret[1] = byte(clientHello.vers)
_, err := io.ReadFull(config.rand(), preMasterSecret[2:])
if err != nil {
return nil, nil, err
}
rsaKey, ok := cert.PublicKey.(*rsa.PublicKey)
if !ok {
return nil, nil, errors.New("tls: server certificate contains incorrect key type for selected ciphersuite")
}
encrypted, err := rsa.EncryptPKCS1v15(config.rand(), rsaKey, preMasterSecret)
if err != nil {
return nil, nil, err
}
ckx := new(clientKeyExchangeMsg)
ckx.ciphertext = make([]byte, len(encrypted)+2)
ckx.ciphertext[0] = byte(len(encrypted) >> 8)
ckx.ciphertext[1] = byte(len(encrypted))
copy(ckx.ciphertext[2:], encrypted)
return preMasterSecret, ckx, nil
}
// sha1Hash calculates a SHA1 hash over the given byte slices.
func sha1Hash(slices [][]byte) []byte {
hsha1 := sha1.New()
for _, slice := range slices {
hsha1.Write(slice)
}
return hsha1.Sum(nil)
}
// md5SHA1Hash implements TLS 1.0's hybrid hash function which consists of the
// concatenation of an MD5 and SHA1 hash.
func md5SHA1Hash(slices [][]byte) []byte {
md5sha1 := make([]byte, md5.Size+sha1.Size)
hmd5 := md5.New()
for _, slice := range slices {
hmd5.Write(slice)
}
copy(md5sha1, hmd5.Sum(nil))
copy(md5sha1[md5.Size:], sha1Hash(slices))
return md5sha1
}
// hashForServerKeyExchange hashes the given slices and returns their digest
// using the given hash function (for >= TLS 1.2) or using a default based on
// the sigType (for earlier TLS versions). For Ed25519 signatures, which don't
// do pre-hashing, it returns the concatenation of the slices.
func hashForServerKeyExchange(sigType uint8, hashFunc crypto.Hash, version uint16, slices ...[]byte) []byte {
if sigType == signatureEd25519 {
var signed []byte
for _, slice := range slices {
signed = append(signed, slice...)
}
return signed
}
if version >= VersionTLS12 {
h := hashFunc.New()
for _, slice := range slices {
h.Write(slice)
}
digest := h.Sum(nil)
return digest
}
if sigType == signatureECDSA {
return sha1Hash(slices)
}
return md5SHA1Hash(slices)
}
// ecdheKeyAgreement implements a TLS key agreement where the server
// generates an ephemeral EC public/private key pair and signs it. The
// pre-master secret is then calculated using ECDH. The signature may
// be ECDSA, Ed25519 or RSA.
type ecdheKeyAgreement struct {
version uint16
isRSA bool
params ecdheParameters
// ckx and preMasterSecret are generated in processServerKeyExchange
// and returned in generateClientKeyExchange.
ckx *clientKeyExchangeMsg
preMasterSecret []byte
}
func (ka *ecdheKeyAgreement) generateServerKeyExchange(config *Config, cert *Certificate, clientHello *clientHelloMsg, hello *serverHelloMsg) (*serverKeyExchangeMsg, error) {
var curveID CurveID
for _, c := range clientHello.supportedCurves {
if config.supportsCurve(c) {
curveID = c
break
}
}
if curveID == 0 {
return nil, errors.New("tls: no supported elliptic curves offered")
}
if _, ok := curveForCurveID(curveID); curveID != X25519 && !ok {
return nil, errors.New("tls: CurvePreferences includes unsupported curve")
}
params, err := generateECDHEParameters(config.rand(), curveID)
if err != nil {
return nil, err
}
ka.params = params
// See RFC 4492, Section 5.4.
ecdhePublic := params.PublicKey()
serverECDHEParams := make([]byte, 1+2+1+len(ecdhePublic))
serverECDHEParams[0] = 3 // named curve
serverECDHEParams[1] = byte(curveID >> 8)
serverECDHEParams[2] = byte(curveID)
serverECDHEParams[3] = byte(len(ecdhePublic))
copy(serverECDHEParams[4:], ecdhePublic)
priv, ok := cert.PrivateKey.(crypto.Signer)
if !ok {
return nil, fmt.Errorf("tls: certificate private key of type %T does not implement crypto.Signer", cert.PrivateKey)
}
var signatureAlgorithm SignatureScheme
var sigType uint8
var sigHash crypto.Hash
if ka.version >= VersionTLS12 {
signatureAlgorithm, err = selectSignatureScheme(ka.version, cert, clientHello.supportedSignatureAlgorithms)
if err != nil {
return nil, err
}
sigType, sigHash, err = typeAndHashFromSignatureScheme(signatureAlgorithm)
if err != nil {
return nil, err
}
} else {
sigType, sigHash, err = legacyTypeAndHashFromPublicKey(priv.Public())
if err != nil {
return nil, err
}
}
if (sigType == signaturePKCS1v15 || sigType == signatureRSAPSS) != ka.isRSA {
return nil, errors.New("tls: certificate cannot be used with the selected cipher suite")
}
signed := hashForServerKeyExchange(sigType, sigHash, ka.version, clientHello.random, hello.random, serverECDHEParams)
signOpts := crypto.SignerOpts(sigHash)
if sigType == signatureRSAPSS {
signOpts = &rsa.PSSOptions{SaltLength: rsa.PSSSaltLengthEqualsHash, Hash: sigHash}
}
sig, err := priv.Sign(config.rand(), signed, signOpts)
if err != nil {
return nil, errors.New("tls: failed to sign ECDHE parameters: " + err.Error())
}
skx := new(serverKeyExchangeMsg)
sigAndHashLen := 0
if ka.version >= VersionTLS12 {
sigAndHashLen = 2
}
skx.key = make([]byte, len(serverECDHEParams)+sigAndHashLen+2+len(sig))
copy(skx.key, serverECDHEParams)
k := skx.key[len(serverECDHEParams):]
if ka.version >= VersionTLS12 {
k[0] = byte(signatureAlgorithm >> 8)
k[1] = byte(signatureAlgorithm)
k = k[2:]
}
k[0] = byte(len(sig) >> 8)
k[1] = byte(len(sig))
copy(k[2:], sig)
return skx, nil
}
func (ka *ecdheKeyAgreement) processClientKeyExchange(config *Config, cert *Certificate, ckx *clientKeyExchangeMsg, version uint16) ([]byte, error) {
if len(ckx.ciphertext) == 0 || int(ckx.ciphertext[0]) != len(ckx.ciphertext)-1 {
return nil, errClientKeyExchange
}
preMasterSecret := ka.params.SharedKey(ckx.ciphertext[1:])
if preMasterSecret == nil {
return nil, errClientKeyExchange
}
return preMasterSecret, nil
}
func (ka *ecdheKeyAgreement) processServerKeyExchange(config *Config, clientHello *clientHelloMsg, serverHello *serverHelloMsg, cert *x509.Certificate, skx *serverKeyExchangeMsg) error {
if len(skx.key) < 4 {
return errServerKeyExchange
}
if skx.key[0] != 3 { // named curve
return errors.New("tls: server selected unsupported curve")
}
curveID := CurveID(skx.key[1])<<8 | CurveID(skx.key[2])
publicLen := int(skx.key[3])
if publicLen+4 > len(skx.key) {
return errServerKeyExchange
}
serverECDHEParams := skx.key[:4+publicLen]
publicKey := serverECDHEParams[4:]
sig := skx.key[4+publicLen:]
if len(sig) < 2 {
return errServerKeyExchange
}
if _, ok := curveForCurveID(curveID); curveID != X25519 && !ok {
return errors.New("tls: server selected unsupported curve")
}
params, err := generateECDHEParameters(config.rand(), curveID)
if err != nil {
return err
}
ka.params = params
ka.preMasterSecret = params.SharedKey(publicKey)
if ka.preMasterSecret == nil {
return errServerKeyExchange
}
ourPublicKey := params.PublicKey()
ka.ckx = new(clientKeyExchangeMsg)
ka.ckx.ciphertext = make([]byte, 1+len(ourPublicKey))
ka.ckx.ciphertext[0] = byte(len(ourPublicKey))
copy(ka.ckx.ciphertext[1:], ourPublicKey)
var sigType uint8
var sigHash crypto.Hash
if ka.version >= VersionTLS12 {
signatureAlgorithm := SignatureScheme(sig[0])<<8 | SignatureScheme(sig[1])
sig = sig[2:]
if len(sig) < 2 {
return errServerKeyExchange
}
if !isSupportedSignatureAlgorithm(signatureAlgorithm, clientHello.supportedSignatureAlgorithms) {
return errors.New("tls: certificate used with invalid signature algorithm")
}
sigType, sigHash, err = typeAndHashFromSignatureScheme(signatureAlgorithm)
if err != nil {
return err
}
} else {
sigType, sigHash, err = legacyTypeAndHashFromPublicKey(cert.PublicKey)
if err != nil {
return err
}
}
if (sigType == signaturePKCS1v15 || sigType == signatureRSAPSS) != ka.isRSA {
return errServerKeyExchange
}
sigLen := int(sig[0])<<8 | int(sig[1])
if sigLen+2 != len(sig) {
return errServerKeyExchange
}
sig = sig[2:]
signed := hashForServerKeyExchange(sigType, sigHash, ka.version, clientHello.random, serverHello.random, serverECDHEParams)
if err := verifyHandshakeSignature(sigType, cert.PublicKey, sigHash, signed, sig); err != nil {
return errors.New("tls: invalid signature by the server certificate: " + err.Error())
}
return nil
}
func (ka *ecdheKeyAgreement) generateClientKeyExchange(config *Config, clientHello *clientHelloMsg, cert *x509.Certificate) ([]byte, *clientKeyExchangeMsg, error) {
if ka.ckx == nil {
return nil, nil, errors.New("tls: missing ServerKeyExchange message")
}
return ka.preMasterSecret, ka.ckx, nil
}

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// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto/elliptic"
"crypto/hmac"
"errors"
"hash"
"io"
"math/big"
"golang.org/x/crypto/cryptobyte"
"golang.org/x/crypto/curve25519"
"golang.org/x/crypto/hkdf"
)
// This file contains the functions necessary to compute the TLS 1.3 key
// schedule. See RFC 8446, Section 7.
const (
resumptionBinderLabel = "res binder"
clientHandshakeTrafficLabel = "c hs traffic"
serverHandshakeTrafficLabel = "s hs traffic"
clientApplicationTrafficLabel = "c ap traffic"
serverApplicationTrafficLabel = "s ap traffic"
exporterLabel = "exp master"
resumptionLabel = "res master"
trafficUpdateLabel = "traffic upd"
)
// expandLabel implements HKDF-Expand-Label from RFC 8446, Section 7.1.
func (c *cipherSuiteTLS13) expandLabel(secret []byte, label string, context []byte, length int) []byte {
var hkdfLabel cryptobyte.Builder
hkdfLabel.AddUint16(uint16(length))
hkdfLabel.AddUint8LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes([]byte("tls13 "))
b.AddBytes([]byte(label))
})
hkdfLabel.AddUint8LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes(context)
})
out := make([]byte, length)
n, err := hkdf.Expand(c.hash.New, secret, hkdfLabel.BytesOrPanic()).Read(out)
if err != nil || n != length {
panic("tls: HKDF-Expand-Label invocation failed unexpectedly")
}
return out
}
// deriveSecret implements Derive-Secret from RFC 8446, Section 7.1.
func (c *cipherSuiteTLS13) deriveSecret(secret []byte, label string, transcript hash.Hash) []byte {
if transcript == nil {
transcript = c.hash.New()
}
return c.expandLabel(secret, label, transcript.Sum(nil), c.hash.Size())
}
// extract implements HKDF-Extract with the cipher suite hash.
func (c *cipherSuiteTLS13) extract(newSecret, currentSecret []byte) []byte {
if newSecret == nil {
newSecret = make([]byte, c.hash.Size())
}
return hkdf.Extract(c.hash.New, newSecret, currentSecret)
}
// nextTrafficSecret generates the next traffic secret, given the current one,
// according to RFC 8446, Section 7.2.
func (c *cipherSuiteTLS13) nextTrafficSecret(trafficSecret []byte) []byte {
return c.expandLabel(trafficSecret, trafficUpdateLabel, nil, c.hash.Size())
}
// trafficKey generates traffic keys according to RFC 8446, Section 7.3.
func (c *cipherSuiteTLS13) trafficKey(trafficSecret []byte) (key, iv []byte) {
key = c.expandLabel(trafficSecret, "key", nil, c.keyLen)
iv = c.expandLabel(trafficSecret, "iv", nil, aeadNonceLength)
return
}
// finishedHash generates the Finished verify_data or PskBinderEntry according
// to RFC 8446, Section 4.4.4. See sections 4.4 and 4.2.11.2 for the baseKey
// selection.
func (c *cipherSuiteTLS13) finishedHash(baseKey []byte, transcript hash.Hash) []byte {
finishedKey := c.expandLabel(baseKey, "finished", nil, c.hash.Size())
verifyData := hmac.New(c.hash.New, finishedKey)
verifyData.Write(transcript.Sum(nil))
return verifyData.Sum(nil)
}
// exportKeyingMaterial implements RFC5705 exporters for TLS 1.3 according to
// RFC 8446, Section 7.5.
func (c *cipherSuiteTLS13) exportKeyingMaterial(masterSecret []byte, transcript hash.Hash) func(string, []byte, int) ([]byte, error) {
expMasterSecret := c.deriveSecret(masterSecret, exporterLabel, transcript)
return func(label string, context []byte, length int) ([]byte, error) {
secret := c.deriveSecret(expMasterSecret, label, nil)
h := c.hash.New()
h.Write(context)
return c.expandLabel(secret, "exporter", h.Sum(nil), length), nil
}
}
// ecdheParameters implements Diffie-Hellman with either NIST curves or X25519,
// according to RFC 8446, Section 4.2.8.2.
type ecdheParameters interface {
CurveID() CurveID
PublicKey() []byte
SharedKey(peerPublicKey []byte) []byte
}
func generateECDHEParameters(rand io.Reader, curveID CurveID) (ecdheParameters, error) {
if curveID == X25519 {
privateKey := make([]byte, curve25519.ScalarSize)
if _, err := io.ReadFull(rand, privateKey); err != nil {
return nil, err
}
publicKey, err := curve25519.X25519(privateKey, curve25519.Basepoint)
if err != nil {
return nil, err
}
return &x25519Parameters{privateKey: privateKey, publicKey: publicKey}, nil
}
curve, ok := curveForCurveID(curveID)
if !ok {
return nil, errors.New("tls: internal error: unsupported curve")
}
p := &nistParameters{curveID: curveID}
var err error
p.privateKey, p.x, p.y, err = elliptic.GenerateKey(curve, rand)
if err != nil {
return nil, err
}
return p, nil
}
func curveForCurveID(id CurveID) (elliptic.Curve, bool) {
switch id {
case CurveP256:
return elliptic.P256(), true
case CurveP384:
return elliptic.P384(), true
case CurveP521:
return elliptic.P521(), true
default:
return nil, false
}
}
type nistParameters struct {
privateKey []byte
x, y *big.Int // public key
curveID CurveID
}
func (p *nistParameters) CurveID() CurveID {
return p.curveID
}
func (p *nistParameters) PublicKey() []byte {
curve, _ := curveForCurveID(p.curveID)
return elliptic.Marshal(curve, p.x, p.y)
}
func (p *nistParameters) SharedKey(peerPublicKey []byte) []byte {
curve, _ := curveForCurveID(p.curveID)
// Unmarshal also checks whether the given point is on the curve.
x, y := elliptic.Unmarshal(curve, peerPublicKey)
if x == nil {
return nil
}
xShared, _ := curve.ScalarMult(x, y, p.privateKey)
sharedKey := make([]byte, (curve.Params().BitSize+7)/8)
return xShared.FillBytes(sharedKey)
}
type x25519Parameters struct {
privateKey []byte
publicKey []byte
}
func (p *x25519Parameters) CurveID() CurveID {
return X25519
}
func (p *x25519Parameters) PublicKey() []byte {
return p.publicKey[:]
}
func (p *x25519Parameters) SharedKey(peerPublicKey []byte) []byte {
sharedKey, err := curve25519.X25519(p.privateKey, peerPublicKey)
if err != nil {
return nil
}
return sharedKey
}

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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !boringcrypto
package tls
func needFIPS() bool { return false }
func supportedSignatureAlgorithms() []SignatureScheme {
return defaultSupportedSignatureAlgorithms
}
func fipsMinVersion(c *Config) uint16 { panic("fipsMinVersion") }
func fipsMaxVersion(c *Config) uint16 { panic("fipsMaxVersion") }
func fipsCurvePreferences(c *Config) []CurveID { panic("fipsCurvePreferences") }
func fipsCipherSuites(c *Config) []uint16 { panic("fipsCipherSuites") }
var fipsSupportedSignatureAlgorithms []SignatureScheme

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"crypto"
"crypto/hmac"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"errors"
"fmt"
"hash"
)
// Split a premaster secret in two as specified in RFC 4346, Section 5.
func splitPreMasterSecret(secret []byte) (s1, s2 []byte) {
s1 = secret[0 : (len(secret)+1)/2]
s2 = secret[len(secret)/2:]
return
}
// pHash implements the P_hash function, as defined in RFC 4346, Section 5.
func pHash(result, secret, seed []byte, hash func() hash.Hash) {
h := hmac.New(hash, secret)
h.Write(seed)
a := h.Sum(nil)
j := 0
for j < len(result) {
h.Reset()
h.Write(a)
h.Write(seed)
b := h.Sum(nil)
copy(result[j:], b)
j += len(b)
h.Reset()
h.Write(a)
a = h.Sum(nil)
}
}
// prf10 implements the TLS 1.0 pseudo-random function, as defined in RFC 2246, Section 5.
func prf10(result, secret, label, seed []byte) {
hashSHA1 := sha1.New
hashMD5 := md5.New
labelAndSeed := make([]byte, len(label)+len(seed))
copy(labelAndSeed, label)
copy(labelAndSeed[len(label):], seed)
s1, s2 := splitPreMasterSecret(secret)
pHash(result, s1, labelAndSeed, hashMD5)
result2 := make([]byte, len(result))
pHash(result2, s2, labelAndSeed, hashSHA1)
for i, b := range result2 {
result[i] ^= b
}
}
// prf12 implements the TLS 1.2 pseudo-random function, as defined in RFC 5246, Section 5.
func prf12(hashFunc func() hash.Hash) func(result, secret, label, seed []byte) {
return func(result, secret, label, seed []byte) {
labelAndSeed := make([]byte, len(label)+len(seed))
copy(labelAndSeed, label)
copy(labelAndSeed[len(label):], seed)
pHash(result, secret, labelAndSeed, hashFunc)
}
}
const (
masterSecretLength = 48 // Length of a master secret in TLS 1.1.
finishedVerifyLength = 12 // Length of verify_data in a Finished message.
)
var (
masterSecretLabel = []byte("master secret")
keyExpansionLabel = []byte("key expansion")
clientFinishedLabel = []byte("client finished")
serverFinishedLabel = []byte("server finished")
)
func prfAndHashForVersion(version uint16, suite *cipherSuite) (func(result, secret, label, seed []byte), crypto.Hash) {
switch version {
case VersionTLS10, VersionTLS11:
return prf10, crypto.Hash(0)
case VersionTLS12:
if suite.flags&suiteSHA384 != 0 {
return prf12(sha512.New384), crypto.SHA384
}
return prf12(sha256.New), crypto.SHA256
default:
panic("unknown version")
}
}
func prfForVersion(version uint16, suite *cipherSuite) func(result, secret, label, seed []byte) {
prf, _ := prfAndHashForVersion(version, suite)
return prf
}
// masterFromPreMasterSecret generates the master secret from the pre-master
// secret. See RFC 5246, Section 8.1.
func masterFromPreMasterSecret(version uint16, suite *cipherSuite, preMasterSecret, clientRandom, serverRandom []byte) []byte {
seed := make([]byte, 0, len(clientRandom)+len(serverRandom))
seed = append(seed, clientRandom...)
seed = append(seed, serverRandom...)
masterSecret := make([]byte, masterSecretLength)
prfForVersion(version, suite)(masterSecret, preMasterSecret, masterSecretLabel, seed)
return masterSecret
}
// keysFromMasterSecret generates the connection keys from the master
// secret, given the lengths of the MAC key, cipher key and IV, as defined in
// RFC 2246, Section 6.3.
func keysFromMasterSecret(version uint16, suite *cipherSuite, masterSecret, clientRandom, serverRandom []byte, macLen, keyLen, ivLen int) (clientMAC, serverMAC, clientKey, serverKey, clientIV, serverIV []byte) {
seed := make([]byte, 0, len(serverRandom)+len(clientRandom))
seed = append(seed, serverRandom...)
seed = append(seed, clientRandom...)
n := 2*macLen + 2*keyLen + 2*ivLen
keyMaterial := make([]byte, n)
prfForVersion(version, suite)(keyMaterial, masterSecret, keyExpansionLabel, seed)
clientMAC = keyMaterial[:macLen]
keyMaterial = keyMaterial[macLen:]
serverMAC = keyMaterial[:macLen]
keyMaterial = keyMaterial[macLen:]
clientKey = keyMaterial[:keyLen]
keyMaterial = keyMaterial[keyLen:]
serverKey = keyMaterial[:keyLen]
keyMaterial = keyMaterial[keyLen:]
clientIV = keyMaterial[:ivLen]
keyMaterial = keyMaterial[ivLen:]
serverIV = keyMaterial[:ivLen]
return
}
func newFinishedHash(version uint16, cipherSuite *cipherSuite) finishedHash {
var buffer []byte
if version >= VersionTLS12 {
buffer = []byte{}
}
prf, hash := prfAndHashForVersion(version, cipherSuite)
if hash != 0 {
return finishedHash{hash.New(), hash.New(), nil, nil, buffer, version, prf}
}
return finishedHash{sha1.New(), sha1.New(), md5.New(), md5.New(), buffer, version, prf}
}
// A finishedHash calculates the hash of a set of handshake messages suitable
// for including in a Finished message.
type finishedHash struct {
client hash.Hash
server hash.Hash
// Prior to TLS 1.2, an additional MD5 hash is required.
clientMD5 hash.Hash
serverMD5 hash.Hash
// In TLS 1.2, a full buffer is sadly required.
buffer []byte
version uint16
prf func(result, secret, label, seed []byte)
}
func (h *finishedHash) Write(msg []byte) (n int, err error) {
h.client.Write(msg)
h.server.Write(msg)
if h.version < VersionTLS12 {
h.clientMD5.Write(msg)
h.serverMD5.Write(msg)
}
if h.buffer != nil {
h.buffer = append(h.buffer, msg...)
}
return len(msg), nil
}
func (h finishedHash) Sum() []byte {
if h.version >= VersionTLS12 {
return h.client.Sum(nil)
}
out := make([]byte, 0, md5.Size+sha1.Size)
out = h.clientMD5.Sum(out)
return h.client.Sum(out)
}
// clientSum returns the contents of the verify_data member of a client's
// Finished message.
func (h finishedHash) clientSum(masterSecret []byte) []byte {
out := make([]byte, finishedVerifyLength)
h.prf(out, masterSecret, clientFinishedLabel, h.Sum())
return out
}
// serverSum returns the contents of the verify_data member of a server's
// Finished message.
func (h finishedHash) serverSum(masterSecret []byte) []byte {
out := make([]byte, finishedVerifyLength)
h.prf(out, masterSecret, serverFinishedLabel, h.Sum())
return out
}
// hashForClientCertificate returns the handshake messages so far, pre-hashed if
// necessary, suitable for signing by a TLS client certificate.
func (h finishedHash) hashForClientCertificate(sigType uint8, hashAlg crypto.Hash, masterSecret []byte) []byte {
if (h.version >= VersionTLS12 || sigType == signatureEd25519) && h.buffer == nil {
panic("tls: handshake hash for a client certificate requested after discarding the handshake buffer")
}
if sigType == signatureEd25519 {
return h.buffer
}
if h.version >= VersionTLS12 {
hash := hashAlg.New()
hash.Write(h.buffer)
return hash.Sum(nil)
}
if sigType == signatureECDSA {
return h.server.Sum(nil)
}
return h.Sum()
}
// discardHandshakeBuffer is called when there is no more need to
// buffer the entirety of the handshake messages.
func (h *finishedHash) discardHandshakeBuffer() {
h.buffer = nil
}
// noExportedKeyingMaterial is used as a value of
// ConnectionState.ekm when renegotiation is enabled and thus
// we wish to fail all key-material export requests.
func noExportedKeyingMaterial(label string, context []byte, length int) ([]byte, error) {
return nil, errors.New("crypto/tls: ExportKeyingMaterial is unavailable when renegotiation is enabled")
}
// ekmFromMasterSecret generates exported keying material as defined in RFC 5705.
func ekmFromMasterSecret(version uint16, suite *cipherSuite, masterSecret, clientRandom, serverRandom []byte) func(string, []byte, int) ([]byte, error) {
return func(label string, context []byte, length int) ([]byte, error) {
switch label {
case "client finished", "server finished", "master secret", "key expansion":
// These values are reserved and may not be used.
return nil, fmt.Errorf("crypto/tls: reserved ExportKeyingMaterial label: %s", label)
}
seedLen := len(serverRandom) + len(clientRandom)
if context != nil {
seedLen += 2 + len(context)
}
seed := make([]byte, 0, seedLen)
seed = append(seed, clientRandom...)
seed = append(seed, serverRandom...)
if context != nil {
if len(context) >= 1<<16 {
return nil, fmt.Errorf("crypto/tls: ExportKeyingMaterial context too long")
}
seed = append(seed, byte(len(context)>>8), byte(len(context)))
seed = append(seed, context...)
}
keyMaterial := make([]byte, length)
prfForVersion(version, suite)(keyMaterial, masterSecret, []byte(label), seed)
return keyMaterial, nil
}
}

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transport/shadowtls/tls_go119/ticket.go Normal file
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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tls
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/hmac"
"crypto/sha256"
"crypto/subtle"
"errors"
"io"
"golang.org/x/crypto/cryptobyte"
)
// sessionState contains the information that is serialized into a session
// ticket in order to later resume a connection.
type sessionState struct {
vers uint16
cipherSuite uint16
createdAt uint64
masterSecret []byte // opaque master_secret<1..2^16-1>;
// struct { opaque certificate<1..2^24-1> } Certificate;
certificates [][]byte // Certificate certificate_list<0..2^24-1>;
// usedOldKey is true if the ticket from which this session came from
// was encrypted with an older key and thus should be refreshed.
usedOldKey bool
}
func (m *sessionState) marshal() []byte {
var b cryptobyte.Builder
b.AddUint16(m.vers)
b.AddUint16(m.cipherSuite)
addUint64(&b, m.createdAt)
b.AddUint16LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes(m.masterSecret)
})
b.AddUint24LengthPrefixed(func(b *cryptobyte.Builder) {
for _, cert := range m.certificates {
b.AddUint24LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes(cert)
})
}
})
return b.BytesOrPanic()
}
func (m *sessionState) unmarshal(data []byte) bool {
*m = sessionState{usedOldKey: m.usedOldKey}
s := cryptobyte.String(data)
if ok := s.ReadUint16(&m.vers) &&
s.ReadUint16(&m.cipherSuite) &&
readUint64(&s, &m.createdAt) &&
readUint16LengthPrefixed(&s, &m.masterSecret) &&
len(m.masterSecret) != 0; !ok {
return false
}
var certList cryptobyte.String
if !s.ReadUint24LengthPrefixed(&certList) {
return false
}
for !certList.Empty() {
var cert []byte
if !readUint24LengthPrefixed(&certList, &cert) {
return false
}
m.certificates = append(m.certificates, cert)
}
return s.Empty()
}
// sessionStateTLS13 is the content of a TLS 1.3 session ticket. Its first
// version (revision = 0) doesn't carry any of the information needed for 0-RTT
// validation and the nonce is always empty.
type sessionStateTLS13 struct {
// uint8 version = 0x0304;
// uint8 revision = 0;
cipherSuite uint16
createdAt uint64
resumptionSecret []byte // opaque resumption_master_secret<1..2^8-1>;
certificate Certificate // CertificateEntry certificate_list<0..2^24-1>;
}
func (m *sessionStateTLS13) marshal() []byte {
var b cryptobyte.Builder
b.AddUint16(VersionTLS13)
b.AddUint8(0) // revision
b.AddUint16(m.cipherSuite)
addUint64(&b, m.createdAt)
b.AddUint8LengthPrefixed(func(b *cryptobyte.Builder) {
b.AddBytes(m.resumptionSecret)
})
marshalCertificate(&b, m.certificate)
return b.BytesOrPanic()
}
func (m *sessionStateTLS13) unmarshal(data []byte) bool {
*m = sessionStateTLS13{}
s := cryptobyte.String(data)
var version uint16
var revision uint8
return s.ReadUint16(&version) &&
version == VersionTLS13 &&
s.ReadUint8(&revision) &&
revision == 0 &&
s.ReadUint16(&m.cipherSuite) &&
readUint64(&s, &m.createdAt) &&
readUint8LengthPrefixed(&s, &m.resumptionSecret) &&
len(m.resumptionSecret) != 0 &&
unmarshalCertificate(&s, &m.certificate) &&
s.Empty()
}
func (c *Conn) encryptTicket(state []byte) ([]byte, error) {
if len(c.ticketKeys) == 0 {
return nil, errors.New("tls: internal error: session ticket keys unavailable")
}
encrypted := make([]byte, ticketKeyNameLen+aes.BlockSize+len(state)+sha256.Size)
keyName := encrypted[:ticketKeyNameLen]
iv := encrypted[ticketKeyNameLen : ticketKeyNameLen+aes.BlockSize]
macBytes := encrypted[len(encrypted)-sha256.Size:]
if _, err := io.ReadFull(c.config.rand(), iv); err != nil {
return nil, err
}
key := c.ticketKeys[0]
copy(keyName, key.keyName[:])
block, err := aes.NewCipher(key.aesKey[:])
if err != nil {
return nil, errors.New("tls: failed to create cipher while encrypting ticket: " + err.Error())
}
cipher.NewCTR(block, iv).XORKeyStream(encrypted[ticketKeyNameLen+aes.BlockSize:], state)
mac := hmac.New(sha256.New, key.hmacKey[:])
mac.Write(encrypted[:len(encrypted)-sha256.Size])
mac.Sum(macBytes[:0])
return encrypted, nil
}
func (c *Conn) decryptTicket(encrypted []byte) (plaintext []byte, usedOldKey bool) {
if len(encrypted) < ticketKeyNameLen+aes.BlockSize+sha256.Size {
return nil, false
}
keyName := encrypted[:ticketKeyNameLen]
iv := encrypted[ticketKeyNameLen : ticketKeyNameLen+aes.BlockSize]
macBytes := encrypted[len(encrypted)-sha256.Size:]
ciphertext := encrypted[ticketKeyNameLen+aes.BlockSize : len(encrypted)-sha256.Size]
keyIndex := -1
for i, candidateKey := range c.ticketKeys {
if bytes.Equal(keyName, candidateKey.keyName[:]) {
keyIndex = i
break
}
}
if keyIndex == -1 {
return nil, false
}
key := &c.ticketKeys[keyIndex]
mac := hmac.New(sha256.New, key.hmacKey[:])
mac.Write(encrypted[:len(encrypted)-sha256.Size])
expected := mac.Sum(nil)
if subtle.ConstantTimeCompare(macBytes, expected) != 1 {
return nil, false
}
block, err := aes.NewCipher(key.aesKey[:])
if err != nil {
return nil, false
}
plaintext = make([]byte, len(ciphertext))
cipher.NewCTR(block, iv).XORKeyStream(plaintext, ciphertext)
return plaintext, keyIndex > 0
}

356
transport/shadowtls/tls_go119/tls.go Normal file
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package tls partially implements TLS 1.2, as specified in RFC 5246,
// and TLS 1.3, as specified in RFC 8446.
package tls
// BUG(agl): The crypto/tls package only implements some countermeasures
// against Lucky13 attacks on CBC-mode encryption, and only on SHA1
// variants. See http://www.isg.rhul.ac.uk/tls/TLStiming.pdf and
// https://www.imperialviolet.org/2013/02/04/luckythirteen.html.
import (
"bytes"
"context"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"net"
"os"
"strings"
)
// Server returns a new TLS server side connection
// using conn as the underlying transport.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func Server(conn net.Conn, config *Config) *Conn {
c := &Conn{
conn: conn,
config: config,
}
c.handshakeFn = c.serverHandshake
return c
}
// Client returns a new TLS client side connection
// using conn as the underlying transport.
// The config cannot be nil: users must set either ServerName or
// InsecureSkipVerify in the config.
func Client(conn net.Conn, config *Config) *Conn {
c := &Conn{
conn: conn,
config: config,
isClient: true,
}
c.handshakeFn = c.clientHandshake
return c
}
// A listener implements a network listener (net.Listener) for TLS connections.
type listener struct {
net.Listener
config *Config
}
// Accept waits for and returns the next incoming TLS connection.
// The returned connection is of type *Conn.
func (l *listener) Accept() (net.Conn, error) {
c, err := l.Listener.Accept()
if err != nil {
return nil, err
}
return Server(c, l.config), nil
}
// NewListener creates a Listener which accepts connections from an inner
// Listener and wraps each connection with Server.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func NewListener(inner net.Listener, config *Config) net.Listener {
l := new(listener)
l.Listener = inner
l.config = config
return l
}
// Listen creates a TLS listener accepting connections on the
// given network address using net.Listen.
// The configuration config must be non-nil and must include
// at least one certificate or else set GetCertificate.
func Listen(network, laddr string, config *Config) (net.Listener, error) {
if config == nil || len(config.Certificates) == 0 &&
config.GetCertificate == nil && config.GetConfigForClient == nil {
return nil, errors.New("tls: neither Certificates, GetCertificate, nor GetConfigForClient set in Config")
}
l, err := net.Listen(network, laddr)
if err != nil {
return nil, err
}
return NewListener(l, config), nil
}
type timeoutError struct{}
func (timeoutError) Error() string { return "tls: DialWithDialer timed out" }
func (timeoutError) Timeout() bool { return true }
func (timeoutError) Temporary() bool { return true }
// DialWithDialer connects to the given network address using dialer.Dial and
// then initiates a TLS handshake, returning the resulting TLS connection. Any
// timeout or deadline given in the dialer apply to connection and TLS
// handshake as a whole.
//
// DialWithDialer interprets a nil configuration as equivalent to the zero
// configuration; see the documentation of Config for the defaults.
//
// DialWithDialer uses context.Background internally; to specify the context,
// use Dialer.DialContext with NetDialer set to the desired dialer.
func DialWithDialer(dialer *net.Dialer, network, addr string, config *Config) (*Conn, error) {
return dial(context.Background(), dialer, network, addr, config)
}
func dial(ctx context.Context, netDialer *net.Dialer, network, addr string, config *Config) (*Conn, error) {
if netDialer.Timeout != 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(ctx, netDialer.Timeout)
defer cancel()
}
if !netDialer.Deadline.IsZero() {
var cancel context.CancelFunc
ctx, cancel = context.WithDeadline(ctx, netDialer.Deadline)
defer cancel()
}
rawConn, err := netDialer.DialContext(ctx, network, addr)
if err != nil {
return nil, err
}
colonPos := strings.LastIndex(addr, ":")
if colonPos == -1 {
colonPos = len(addr)
}
hostname := addr[:colonPos]
if config == nil {
config = defaultConfig()
}
// If no ServerName is set, infer the ServerName
// from the hostname we're connecting to.
if config.ServerName == "" {
// Make a copy to avoid polluting argument or default.
c := config.Clone()
c.ServerName = hostname
config = c
}
conn := Client(rawConn, config)
if err := conn.HandshakeContext(ctx); err != nil {
rawConn.Close()
return nil, err
}
return conn, nil
}
// Dial connects to the given network address using net.Dial
// and then initiates a TLS handshake, returning the resulting
// TLS connection.
// Dial interprets a nil configuration as equivalent to
// the zero configuration; see the documentation of Config
// for the defaults.
func Dial(network, addr string, config *Config) (*Conn, error) {
return DialWithDialer(new(net.Dialer), network, addr, config)
}
// Dialer dials TLS connections given a configuration and a Dialer for the
// underlying connection.
type Dialer struct {
// NetDialer is the optional dialer to use for the TLS connections'
// underlying TCP connections.
// A nil NetDialer is equivalent to the net.Dialer zero value.
NetDialer *net.Dialer
// Config is the TLS configuration to use for new connections.
// A nil configuration is equivalent to the zero
// configuration; see the documentation of Config for the
// defaults.
Config *Config
}
// Dial connects to the given network address and initiates a TLS
// handshake, returning the resulting TLS connection.
//
// The returned Conn, if any, will always be of type *Conn.
//
// Dial uses context.Background internally; to specify the context,
// use DialContext.
func (d *Dialer) Dial(network, addr string) (net.Conn, error) {
return d.DialContext(context.Background(), network, addr)
}
func (d *Dialer) netDialer() *net.Dialer {
if d.NetDialer != nil {
return d.NetDialer
}
return new(net.Dialer)
}
// DialContext connects to the given network address and initiates a TLS
// handshake, returning the resulting TLS connection.
//
// The provided Context must be non-nil. If the context expires before
// the connection is complete, an error is returned. Once successfully
// connected, any expiration of the context will not affect the
// connection.
//
// The returned Conn, if any, will always be of type *Conn.
func (d *Dialer) DialContext(ctx context.Context, network, addr string) (net.Conn, error) {
c, err := dial(ctx, d.netDialer(), network, addr, d.Config)
if err != nil {
// Don't return c (a typed nil) in an interface.
return nil, err
}
return c, nil
}
// LoadX509KeyPair reads and parses a public/private key pair from a pair
// of files. The files must contain PEM encoded data. The certificate file
// may contain intermediate certificates following the leaf certificate to
// form a certificate chain. On successful return, Certificate.Leaf will
// be nil because the parsed form of the certificate is not retained.
func LoadX509KeyPair(certFile, keyFile string) (Certificate, error) {
certPEMBlock, err := os.ReadFile(certFile)
if err != nil {
return Certificate{}, err
}
keyPEMBlock, err := os.ReadFile(keyFile)
if err != nil {
return Certificate{}, err
}
return X509KeyPair(certPEMBlock, keyPEMBlock)
}
// X509KeyPair parses a public/private key pair from a pair of
// PEM encoded data. On successful return, Certificate.Leaf will be nil because
// the parsed form of the certificate is not retained.
func X509KeyPair(certPEMBlock, keyPEMBlock []byte) (Certificate, error) {
fail := func(err error) (Certificate, error) { return Certificate{}, err }
var cert Certificate
var skippedBlockTypes []string
for {
var certDERBlock *pem.Block
certDERBlock, certPEMBlock = pem.Decode(certPEMBlock)
if certDERBlock == nil {
break
}
if certDERBlock.Type == "CERTIFICATE" {
cert.Certificate = append(cert.Certificate, certDERBlock.Bytes)
} else {
skippedBlockTypes = append(skippedBlockTypes, certDERBlock.Type)
}
}
if len(cert.Certificate) == 0 {
if len(skippedBlockTypes) == 0 {
return fail(errors.New("tls: failed to find any PEM data in certificate input"))
}
if len(skippedBlockTypes) == 1 && strings.HasSuffix(skippedBlockTypes[0], "PRIVATE KEY") {
return fail(errors.New("tls: failed to find certificate PEM data in certificate input, but did find a private key; PEM inputs may have been switched"))
}
return fail(fmt.Errorf("tls: failed to find \"CERTIFICATE\" PEM block in certificate input after skipping PEM blocks of the following types: %v", skippedBlockTypes))
}
skippedBlockTypes = skippedBlockTypes[:0]
var keyDERBlock *pem.Block
for {
keyDERBlock, keyPEMBlock = pem.Decode(keyPEMBlock)
if keyDERBlock == nil {
if len(skippedBlockTypes) == 0 {
return fail(errors.New("tls: failed to find any PEM data in key input"))
}
if len(skippedBlockTypes) == 1 && skippedBlockTypes[0] == "CERTIFICATE" {
return fail(errors.New("tls: found a certificate rather than a key in the PEM for the private key"))
}
return fail(fmt.Errorf("tls: failed to find PEM block with type ending in \"PRIVATE KEY\" in key input after skipping PEM blocks of the following types: %v", skippedBlockTypes))
}
if keyDERBlock.Type == "PRIVATE KEY" || strings.HasSuffix(keyDERBlock.Type, " PRIVATE KEY") {
break
}
skippedBlockTypes = append(skippedBlockTypes, keyDERBlock.Type)
}
// We don't need to parse the public key for TLS, but we so do anyway
// to check that it looks sane and matches the private key.
x509Cert, err := x509.ParseCertificate(cert.Certificate[0])
if err != nil {
return fail(err)
}
cert.PrivateKey, err = parsePrivateKey(keyDERBlock.Bytes)
if err != nil {
return fail(err)
}
switch pub := x509Cert.PublicKey.(type) {
case *rsa.PublicKey:
priv, ok := cert.PrivateKey.(*rsa.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if pub.N.Cmp(priv.N) != 0 {
return fail(errors.New("tls: private key does not match public key"))
}
case *ecdsa.PublicKey:
priv, ok := cert.PrivateKey.(*ecdsa.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if pub.X.Cmp(priv.X) != 0 || pub.Y.Cmp(priv.Y) != 0 {
return fail(errors.New("tls: private key does not match public key"))
}
case ed25519.PublicKey:
priv, ok := cert.PrivateKey.(ed25519.PrivateKey)
if !ok {
return fail(errors.New("tls: private key type does not match public key type"))
}
if !bytes.Equal(priv.Public().(ed25519.PublicKey), pub) {
return fail(errors.New("tls: private key does not match public key"))
}
default:
return fail(errors.New("tls: unknown public key algorithm"))
}
return cert, nil
}
// Attempt to parse the given private key DER block. OpenSSL 0.9.8 generates
// PKCS #1 private keys by default, while OpenSSL 1.0.0 generates PKCS #8 keys.
// OpenSSL ecparam generates SEC1 EC private keys for ECDSA. We try all three.
func parsePrivateKey(der []byte) (crypto.PrivateKey, error) {
if key, err := x509.ParsePKCS1PrivateKey(der); err == nil {
return key, nil
}
if key, err := x509.ParsePKCS8PrivateKey(der); err == nil {
switch key := key.(type) {
case *rsa.PrivateKey, *ecdsa.PrivateKey, ed25519.PrivateKey:
return key, nil
default:
return nil, errors.New("tls: found unknown private key type in PKCS#8 wrapping")
}
}
if key, err := x509.ParseECPrivateKey(der); err == nil {
return key, nil
}
return nil, errors.New("tls: failed to parse private key")
}