mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-30 12:31:29 +00:00
550 lines
20 KiB
Go
550 lines
20 KiB
Go
package encoding
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/md5"
|
|
"crypto/sha256"
|
|
"encoding/binary"
|
|
"hash/fnv"
|
|
"io"
|
|
"sync"
|
|
"time"
|
|
|
|
"golang.org/x/crypto/chacha20poly1305"
|
|
|
|
"github.com/xtls/xray-core/common"
|
|
"github.com/xtls/xray-core/common/bitmask"
|
|
"github.com/xtls/xray-core/common/buf"
|
|
"github.com/xtls/xray-core/common/crypto"
|
|
"github.com/xtls/xray-core/common/dice"
|
|
"github.com/xtls/xray-core/common/net"
|
|
"github.com/xtls/xray-core/common/protocol"
|
|
"github.com/xtls/xray-core/common/task"
|
|
"github.com/xtls/xray-core/proxy/vmess"
|
|
vmessaead "github.com/xtls/xray-core/proxy/vmess/aead"
|
|
)
|
|
|
|
type sessionID struct {
|
|
user [16]byte
|
|
key [16]byte
|
|
nonce [16]byte
|
|
}
|
|
|
|
// SessionHistory keeps track of historical session ids, to prevent replay attacks.
|
|
type SessionHistory struct {
|
|
sync.RWMutex
|
|
cache map[sessionID]time.Time
|
|
task *task.Periodic
|
|
}
|
|
|
|
// NewSessionHistory creates a new SessionHistory object.
|
|
func NewSessionHistory() *SessionHistory {
|
|
h := &SessionHistory{
|
|
cache: make(map[sessionID]time.Time, 128),
|
|
}
|
|
h.task = &task.Periodic{
|
|
Interval: time.Second * 30,
|
|
Execute: h.removeExpiredEntries,
|
|
}
|
|
return h
|
|
}
|
|
|
|
// Close implements common.Closable.
|
|
func (h *SessionHistory) Close() error {
|
|
return h.task.Close()
|
|
}
|
|
|
|
func (h *SessionHistory) addIfNotExits(session sessionID) bool {
|
|
h.Lock()
|
|
|
|
if expire, found := h.cache[session]; found && expire.After(time.Now()) {
|
|
h.Unlock()
|
|
return false
|
|
}
|
|
|
|
h.cache[session] = time.Now().Add(time.Minute * 3)
|
|
h.Unlock()
|
|
common.Must(h.task.Start())
|
|
return true
|
|
}
|
|
|
|
func (h *SessionHistory) removeExpiredEntries() error {
|
|
now := time.Now()
|
|
|
|
h.Lock()
|
|
defer h.Unlock()
|
|
|
|
if len(h.cache) == 0 {
|
|
return newError("nothing to do")
|
|
}
|
|
|
|
for session, expire := range h.cache {
|
|
if expire.Before(now) {
|
|
delete(h.cache, session)
|
|
}
|
|
}
|
|
|
|
if len(h.cache) == 0 {
|
|
h.cache = make(map[sessionID]time.Time, 128)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// ServerSession keeps information for a session in VMess server.
|
|
type ServerSession struct {
|
|
userValidator *vmess.TimedUserValidator
|
|
sessionHistory *SessionHistory
|
|
requestBodyKey [16]byte
|
|
requestBodyIV [16]byte
|
|
responseBodyKey [16]byte
|
|
responseBodyIV [16]byte
|
|
responseWriter io.Writer
|
|
responseHeader byte
|
|
|
|
isAEADRequest bool
|
|
|
|
isAEADForced bool
|
|
}
|
|
|
|
// NewServerSession creates a new ServerSession, using the given UserValidator.
|
|
// The ServerSession instance doesn't take ownership of the validator.
|
|
func NewServerSession(validator *vmess.TimedUserValidator, sessionHistory *SessionHistory) *ServerSession {
|
|
return &ServerSession{
|
|
userValidator: validator,
|
|
sessionHistory: sessionHistory,
|
|
}
|
|
}
|
|
|
|
// SetAEADForced sets isAEADForced for a ServerSession.
|
|
func (s *ServerSession) SetAEADForced(isAEADForced bool) {
|
|
s.isAEADForced = isAEADForced
|
|
}
|
|
|
|
func parseSecurityType(b byte) protocol.SecurityType {
|
|
if _, f := protocol.SecurityType_name[int32(b)]; f {
|
|
st := protocol.SecurityType(b)
|
|
// For backward compatibility.
|
|
if st == protocol.SecurityType_UNKNOWN {
|
|
st = protocol.SecurityType_LEGACY
|
|
}
|
|
return st
|
|
}
|
|
return protocol.SecurityType_UNKNOWN
|
|
}
|
|
|
|
// DecodeRequestHeader decodes and returns (if successful) a RequestHeader from an input stream.
|
|
func (s *ServerSession) DecodeRequestHeader(reader io.Reader, isDrain bool) (*protocol.RequestHeader, error) {
|
|
buffer := buf.New()
|
|
behaviorRand := dice.NewDeterministicDice(int64(s.userValidator.GetBehaviorSeed()))
|
|
BaseDrainSize := behaviorRand.Roll(3266)
|
|
RandDrainMax := behaviorRand.Roll(64) + 1
|
|
RandDrainRolled := dice.Roll(RandDrainMax)
|
|
DrainSize := BaseDrainSize + 16 + 38 + RandDrainRolled
|
|
readSizeRemain := DrainSize
|
|
|
|
drainConnection := func(e error) error {
|
|
// We read a deterministic generated length of data before closing the connection to offset padding read pattern
|
|
readSizeRemain -= int(buffer.Len())
|
|
if readSizeRemain > 0 && isDrain {
|
|
err := s.DrainConnN(reader, readSizeRemain)
|
|
if err != nil {
|
|
return newError("failed to drain connection DrainSize = ", BaseDrainSize, " ", RandDrainMax, " ", RandDrainRolled).Base(err).Base(e)
|
|
}
|
|
return newError("connection drained DrainSize = ", BaseDrainSize, " ", RandDrainMax, " ", RandDrainRolled).Base(e)
|
|
}
|
|
return e
|
|
}
|
|
|
|
defer func() {
|
|
buffer.Release()
|
|
}()
|
|
|
|
if _, err := buffer.ReadFullFrom(reader, protocol.IDBytesLen); err != nil {
|
|
return nil, newError("failed to read request header").Base(err)
|
|
}
|
|
|
|
var decryptor io.Reader
|
|
var vmessAccount *vmess.MemoryAccount
|
|
|
|
user, foundAEAD, errorAEAD := s.userValidator.GetAEAD(buffer.Bytes())
|
|
|
|
var fixedSizeAuthID [16]byte
|
|
copy(fixedSizeAuthID[:], buffer.Bytes())
|
|
|
|
switch {
|
|
case foundAEAD:
|
|
vmessAccount = user.Account.(*vmess.MemoryAccount)
|
|
var fixedSizeCmdKey [16]byte
|
|
copy(fixedSizeCmdKey[:], vmessAccount.ID.CmdKey())
|
|
aeadData, shouldDrain, bytesRead, errorReason := vmessaead.OpenVMessAEADHeader(fixedSizeCmdKey, fixedSizeAuthID, reader)
|
|
if errorReason != nil {
|
|
if shouldDrain {
|
|
readSizeRemain -= bytesRead
|
|
return nil, drainConnection(newError("AEAD read failed").Base(errorReason))
|
|
} else {
|
|
return nil, drainConnection(newError("AEAD read failed, drain skipped").Base(errorReason))
|
|
}
|
|
}
|
|
decryptor = bytes.NewReader(aeadData)
|
|
s.isAEADRequest = true
|
|
|
|
case errorAEAD == vmessaead.ErrNotFound:
|
|
userLegacy, timestamp, valid, userValidationError := s.userValidator.Get(buffer.Bytes())
|
|
if !valid || userValidationError != nil {
|
|
return nil, drainConnection(newError("invalid user").Base(userValidationError))
|
|
}
|
|
if s.isAEADForced {
|
|
return nil, drainConnection(newError("invalid user: VMessAEAD is enforced and a non VMessAEAD connection is received. You can still disable this security feature with environment variable xray.vmess.aead.forced = false . You will not be able to enable legacy header workaround in the future."))
|
|
}
|
|
if s.userValidator.ShouldShowLegacyWarn() {
|
|
newError("Critical Warning: potentially invalid user: a non VMessAEAD connection is received. From 2022 Jan 1st, this kind of connection will be rejected by default. You should update or replace your client software now. This message will not be shown for further violation on this inbound.").AtWarning().WriteToLog()
|
|
}
|
|
user = userLegacy
|
|
iv := hashTimestamp(md5.New(), timestamp)
|
|
vmessAccount = userLegacy.Account.(*vmess.MemoryAccount)
|
|
|
|
aesStream := crypto.NewAesDecryptionStream(vmessAccount.ID.CmdKey(), iv)
|
|
decryptor = crypto.NewCryptionReader(aesStream, reader)
|
|
|
|
default:
|
|
return nil, drainConnection(newError("invalid user").Base(errorAEAD))
|
|
}
|
|
|
|
readSizeRemain -= int(buffer.Len())
|
|
buffer.Clear()
|
|
if _, err := buffer.ReadFullFrom(decryptor, 38); err != nil {
|
|
return nil, newError("failed to read request header").Base(err)
|
|
}
|
|
|
|
request := &protocol.RequestHeader{
|
|
User: user,
|
|
Version: buffer.Byte(0),
|
|
}
|
|
|
|
copy(s.requestBodyIV[:], buffer.BytesRange(1, 17)) // 16 bytes
|
|
copy(s.requestBodyKey[:], buffer.BytesRange(17, 33)) // 16 bytes
|
|
var sid sessionID
|
|
copy(sid.user[:], vmessAccount.ID.Bytes())
|
|
sid.key = s.requestBodyKey
|
|
sid.nonce = s.requestBodyIV
|
|
if !s.sessionHistory.addIfNotExits(sid) {
|
|
if !s.isAEADRequest {
|
|
drainErr := s.userValidator.BurnTaintFuse(fixedSizeAuthID[:])
|
|
if drainErr != nil {
|
|
return nil, drainConnection(newError("duplicated session id, possibly under replay attack, and failed to taint userHash").Base(drainErr))
|
|
}
|
|
return nil, drainConnection(newError("duplicated session id, possibly under replay attack, userHash tainted"))
|
|
} else {
|
|
return nil, newError("duplicated session id, possibly under replay attack, but this is a AEAD request")
|
|
}
|
|
}
|
|
|
|
s.responseHeader = buffer.Byte(33) // 1 byte
|
|
request.Option = bitmask.Byte(buffer.Byte(34)) // 1 byte
|
|
paddingLen := int(buffer.Byte(35) >> 4)
|
|
request.Security = parseSecurityType(buffer.Byte(35) & 0x0F)
|
|
// 1 bytes reserved
|
|
request.Command = protocol.RequestCommand(buffer.Byte(37))
|
|
|
|
switch request.Command {
|
|
case protocol.RequestCommandMux:
|
|
request.Address = net.DomainAddress("v1.mux.cool")
|
|
request.Port = 0
|
|
|
|
case protocol.RequestCommandTCP, protocol.RequestCommandUDP:
|
|
if addr, port, err := addrParser.ReadAddressPort(buffer, decryptor); err == nil {
|
|
request.Address = addr
|
|
request.Port = port
|
|
}
|
|
}
|
|
|
|
if paddingLen > 0 {
|
|
if _, err := buffer.ReadFullFrom(decryptor, int32(paddingLen)); err != nil {
|
|
if !s.isAEADRequest {
|
|
burnErr := s.userValidator.BurnTaintFuse(fixedSizeAuthID[:])
|
|
if burnErr != nil {
|
|
return nil, newError("failed to read padding, failed to taint userHash").Base(burnErr).Base(err)
|
|
}
|
|
return nil, newError("failed to read padding, userHash tainted").Base(err)
|
|
}
|
|
return nil, newError("failed to read padding").Base(err)
|
|
}
|
|
}
|
|
|
|
if _, err := buffer.ReadFullFrom(decryptor, 4); err != nil {
|
|
if !s.isAEADRequest {
|
|
burnErr := s.userValidator.BurnTaintFuse(fixedSizeAuthID[:])
|
|
if burnErr != nil {
|
|
return nil, newError("failed to read checksum, failed to taint userHash").Base(burnErr).Base(err)
|
|
}
|
|
return nil, newError("failed to read checksum, userHash tainted").Base(err)
|
|
}
|
|
return nil, newError("failed to read checksum").Base(err)
|
|
}
|
|
|
|
fnv1a := fnv.New32a()
|
|
common.Must2(fnv1a.Write(buffer.BytesTo(-4)))
|
|
actualHash := fnv1a.Sum32()
|
|
expectedHash := binary.BigEndian.Uint32(buffer.BytesFrom(-4))
|
|
|
|
if actualHash != expectedHash {
|
|
if !s.isAEADRequest {
|
|
Autherr := newError("invalid auth, legacy userHash tainted")
|
|
burnErr := s.userValidator.BurnTaintFuse(fixedSizeAuthID[:])
|
|
if burnErr != nil {
|
|
Autherr = newError("invalid auth, can't taint legacy userHash").Base(burnErr)
|
|
}
|
|
// It is possible that we are under attack described in https://github.com/xray/xray-core/issues/2523
|
|
return nil, drainConnection(Autherr)
|
|
} else {
|
|
return nil, newError("invalid auth, but this is a AEAD request")
|
|
}
|
|
}
|
|
|
|
if request.Address == nil {
|
|
return nil, newError("invalid remote address")
|
|
}
|
|
|
|
if request.Security == protocol.SecurityType_UNKNOWN || request.Security == protocol.SecurityType_AUTO {
|
|
return nil, newError("unknown security type: ", request.Security)
|
|
}
|
|
|
|
return request, nil
|
|
}
|
|
|
|
// DecodeRequestBody returns Reader from which caller can fetch decrypted body.
|
|
func (s *ServerSession) DecodeRequestBody(request *protocol.RequestHeader, reader io.Reader) buf.Reader {
|
|
var sizeParser crypto.ChunkSizeDecoder = crypto.PlainChunkSizeParser{}
|
|
if request.Option.Has(protocol.RequestOptionChunkMasking) {
|
|
sizeParser = NewShakeSizeParser(s.requestBodyIV[:])
|
|
}
|
|
var padding crypto.PaddingLengthGenerator
|
|
if request.Option.Has(protocol.RequestOptionGlobalPadding) {
|
|
padding = sizeParser.(crypto.PaddingLengthGenerator)
|
|
}
|
|
|
|
switch request.Security {
|
|
case protocol.SecurityType_NONE:
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) {
|
|
if request.Command.TransferType() == protocol.TransferTypeStream {
|
|
return crypto.NewChunkStreamReader(sizeParser, reader)
|
|
}
|
|
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: new(NoOpAuthenticator),
|
|
NonceGenerator: crypto.GenerateEmptyBytes(),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationReader(auth, sizeParser, reader, protocol.TransferTypePacket, padding)
|
|
}
|
|
return buf.NewReader(reader)
|
|
|
|
case protocol.SecurityType_LEGACY:
|
|
aesStream := crypto.NewAesDecryptionStream(s.requestBodyKey[:], s.requestBodyIV[:])
|
|
cryptionReader := crypto.NewCryptionReader(aesStream, reader)
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) {
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: new(FnvAuthenticator),
|
|
NonceGenerator: crypto.GenerateEmptyBytes(),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationReader(auth, sizeParser, cryptionReader, request.Command.TransferType(), padding)
|
|
}
|
|
return buf.NewReader(cryptionReader)
|
|
|
|
case protocol.SecurityType_AES128_GCM:
|
|
aead := crypto.NewAesGcm(s.requestBodyKey[:])
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: aead,
|
|
NonceGenerator: GenerateChunkNonce(s.requestBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
if request.Option.Has(protocol.RequestOptionAuthenticatedLength) {
|
|
AuthenticatedLengthKey := vmessaead.KDF16(s.requestBodyKey[:], "auth_len")
|
|
AuthenticatedLengthKeyAEAD := crypto.NewAesGcm(AuthenticatedLengthKey)
|
|
|
|
lengthAuth := &crypto.AEADAuthenticator{
|
|
AEAD: AuthenticatedLengthKeyAEAD,
|
|
NonceGenerator: GenerateChunkNonce(s.requestBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
sizeParser = NewAEADSizeParser(lengthAuth)
|
|
}
|
|
return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding)
|
|
|
|
case protocol.SecurityType_CHACHA20_POLY1305:
|
|
aead, _ := chacha20poly1305.New(GenerateChacha20Poly1305Key(s.requestBodyKey[:]))
|
|
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: aead,
|
|
NonceGenerator: GenerateChunkNonce(s.requestBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
if request.Option.Has(protocol.RequestOptionAuthenticatedLength) {
|
|
AuthenticatedLengthKey := vmessaead.KDF16(s.requestBodyKey[:], "auth_len")
|
|
AuthenticatedLengthKeyAEAD, err := chacha20poly1305.New(GenerateChacha20Poly1305Key(AuthenticatedLengthKey))
|
|
common.Must(err)
|
|
|
|
lengthAuth := &crypto.AEADAuthenticator{
|
|
AEAD: AuthenticatedLengthKeyAEAD,
|
|
NonceGenerator: GenerateChunkNonce(s.requestBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
sizeParser = NewAEADSizeParser(lengthAuth)
|
|
}
|
|
return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding)
|
|
|
|
default:
|
|
panic("Unknown security type.")
|
|
}
|
|
}
|
|
|
|
// EncodeResponseHeader writes encoded response header into the given writer.
|
|
func (s *ServerSession) EncodeResponseHeader(header *protocol.ResponseHeader, writer io.Writer) {
|
|
var encryptionWriter io.Writer
|
|
if !s.isAEADRequest {
|
|
s.responseBodyKey = md5.Sum(s.requestBodyKey[:])
|
|
s.responseBodyIV = md5.Sum(s.requestBodyIV[:])
|
|
} else {
|
|
BodyKey := sha256.Sum256(s.requestBodyKey[:])
|
|
copy(s.responseBodyKey[:], BodyKey[:16])
|
|
BodyIV := sha256.Sum256(s.requestBodyIV[:])
|
|
copy(s.responseBodyIV[:], BodyIV[:16])
|
|
}
|
|
|
|
aesStream := crypto.NewAesEncryptionStream(s.responseBodyKey[:], s.responseBodyIV[:])
|
|
encryptionWriter = crypto.NewCryptionWriter(aesStream, writer)
|
|
s.responseWriter = encryptionWriter
|
|
|
|
aeadEncryptedHeaderBuffer := bytes.NewBuffer(nil)
|
|
|
|
if s.isAEADRequest {
|
|
encryptionWriter = aeadEncryptedHeaderBuffer
|
|
}
|
|
|
|
common.Must2(encryptionWriter.Write([]byte{s.responseHeader, byte(header.Option)}))
|
|
err := MarshalCommand(header.Command, encryptionWriter)
|
|
if err != nil {
|
|
common.Must2(encryptionWriter.Write([]byte{0x00, 0x00}))
|
|
}
|
|
|
|
if s.isAEADRequest {
|
|
aeadResponseHeaderLengthEncryptionKey := vmessaead.KDF16(s.responseBodyKey[:], vmessaead.KDFSaltConstAEADRespHeaderLenKey)
|
|
aeadResponseHeaderLengthEncryptionIV := vmessaead.KDF(s.responseBodyIV[:], vmessaead.KDFSaltConstAEADRespHeaderLenIV)[:12]
|
|
|
|
aeadResponseHeaderLengthEncryptionKeyAESBlock := common.Must2(aes.NewCipher(aeadResponseHeaderLengthEncryptionKey)).(cipher.Block)
|
|
aeadResponseHeaderLengthEncryptionAEAD := common.Must2(cipher.NewGCM(aeadResponseHeaderLengthEncryptionKeyAESBlock)).(cipher.AEAD)
|
|
|
|
aeadResponseHeaderLengthEncryptionBuffer := bytes.NewBuffer(nil)
|
|
|
|
decryptedResponseHeaderLengthBinaryDeserializeBuffer := uint16(aeadEncryptedHeaderBuffer.Len())
|
|
|
|
common.Must(binary.Write(aeadResponseHeaderLengthEncryptionBuffer, binary.BigEndian, decryptedResponseHeaderLengthBinaryDeserializeBuffer))
|
|
|
|
AEADEncryptedLength := aeadResponseHeaderLengthEncryptionAEAD.Seal(nil, aeadResponseHeaderLengthEncryptionIV, aeadResponseHeaderLengthEncryptionBuffer.Bytes(), nil)
|
|
common.Must2(io.Copy(writer, bytes.NewReader(AEADEncryptedLength)))
|
|
|
|
aeadResponseHeaderPayloadEncryptionKey := vmessaead.KDF16(s.responseBodyKey[:], vmessaead.KDFSaltConstAEADRespHeaderPayloadKey)
|
|
aeadResponseHeaderPayloadEncryptionIV := vmessaead.KDF(s.responseBodyIV[:], vmessaead.KDFSaltConstAEADRespHeaderPayloadIV)[:12]
|
|
|
|
aeadResponseHeaderPayloadEncryptionKeyAESBlock := common.Must2(aes.NewCipher(aeadResponseHeaderPayloadEncryptionKey)).(cipher.Block)
|
|
aeadResponseHeaderPayloadEncryptionAEAD := common.Must2(cipher.NewGCM(aeadResponseHeaderPayloadEncryptionKeyAESBlock)).(cipher.AEAD)
|
|
|
|
aeadEncryptedHeaderPayload := aeadResponseHeaderPayloadEncryptionAEAD.Seal(nil, aeadResponseHeaderPayloadEncryptionIV, aeadEncryptedHeaderBuffer.Bytes(), nil)
|
|
common.Must2(io.Copy(writer, bytes.NewReader(aeadEncryptedHeaderPayload)))
|
|
}
|
|
}
|
|
|
|
// EncodeResponseBody returns a Writer that auto-encrypt content written by caller.
|
|
func (s *ServerSession) EncodeResponseBody(request *protocol.RequestHeader, writer io.Writer) buf.Writer {
|
|
var sizeParser crypto.ChunkSizeEncoder = crypto.PlainChunkSizeParser{}
|
|
if request.Option.Has(protocol.RequestOptionChunkMasking) {
|
|
sizeParser = NewShakeSizeParser(s.responseBodyIV[:])
|
|
}
|
|
var padding crypto.PaddingLengthGenerator
|
|
if request.Option.Has(protocol.RequestOptionGlobalPadding) {
|
|
padding = sizeParser.(crypto.PaddingLengthGenerator)
|
|
}
|
|
|
|
switch request.Security {
|
|
case protocol.SecurityType_NONE:
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) {
|
|
if request.Command.TransferType() == protocol.TransferTypeStream {
|
|
return crypto.NewChunkStreamWriter(sizeParser, writer)
|
|
}
|
|
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: new(NoOpAuthenticator),
|
|
NonceGenerator: crypto.GenerateEmptyBytes(),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, protocol.TransferTypePacket, padding)
|
|
}
|
|
return buf.NewWriter(writer)
|
|
|
|
case protocol.SecurityType_LEGACY:
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) {
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: new(FnvAuthenticator),
|
|
NonceGenerator: crypto.GenerateEmptyBytes(),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationWriter(auth, sizeParser, s.responseWriter, request.Command.TransferType(), padding)
|
|
}
|
|
return &buf.SequentialWriter{Writer: s.responseWriter}
|
|
|
|
case protocol.SecurityType_AES128_GCM:
|
|
aead := crypto.NewAesGcm(s.responseBodyKey[:])
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: aead,
|
|
NonceGenerator: GenerateChunkNonce(s.responseBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
if request.Option.Has(protocol.RequestOptionAuthenticatedLength) {
|
|
AuthenticatedLengthKey := vmessaead.KDF16(s.requestBodyKey[:], "auth_len")
|
|
AuthenticatedLengthKeyAEAD := crypto.NewAesGcm(AuthenticatedLengthKey)
|
|
|
|
lengthAuth := &crypto.AEADAuthenticator{
|
|
AEAD: AuthenticatedLengthKeyAEAD,
|
|
NonceGenerator: GenerateChunkNonce(s.requestBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
sizeParser = NewAEADSizeParser(lengthAuth)
|
|
}
|
|
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding)
|
|
|
|
case protocol.SecurityType_CHACHA20_POLY1305:
|
|
aead, _ := chacha20poly1305.New(GenerateChacha20Poly1305Key(s.responseBodyKey[:]))
|
|
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: aead,
|
|
NonceGenerator: GenerateChunkNonce(s.responseBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
if request.Option.Has(protocol.RequestOptionAuthenticatedLength) {
|
|
AuthenticatedLengthKey := vmessaead.KDF16(s.requestBodyKey[:], "auth_len")
|
|
AuthenticatedLengthKeyAEAD, err := chacha20poly1305.New(GenerateChacha20Poly1305Key(AuthenticatedLengthKey))
|
|
common.Must(err)
|
|
|
|
lengthAuth := &crypto.AEADAuthenticator{
|
|
AEAD: AuthenticatedLengthKeyAEAD,
|
|
NonceGenerator: GenerateChunkNonce(s.requestBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
sizeParser = NewAEADSizeParser(lengthAuth)
|
|
}
|
|
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding)
|
|
|
|
default:
|
|
panic("Unknown security type.")
|
|
}
|
|
}
|
|
|
|
func (s *ServerSession) DrainConnN(reader io.Reader, n int) error {
|
|
_, err := io.CopyN(io.Discard, reader, int64(n))
|
|
return err
|
|
}
|