Xray-core/transport/internet/xtls/config.go
2020-12-11 13:05:29 +08:00

240 lines
6 KiB
Go

package xtls
import (
"crypto/x509"
"sync"
"time"
xtls "github.com/xtls/go"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol/tls/cert"
"github.com/xtls/xray-core/transport/internet"
)
var (
globalSessionCache = xtls.NewLRUClientSessionCache(128)
)
// ParseCertificate converts a cert.Certificate to Certificate.
func ParseCertificate(c *cert.Certificate) *Certificate {
if c != nil {
certPEM, keyPEM := c.ToPEM()
return &Certificate{
Certificate: certPEM,
Key: keyPEM,
}
}
return nil
}
func (c *Config) loadSelfCertPool() (*x509.CertPool, error) {
root := x509.NewCertPool()
for _, cert := range c.Certificate {
if !root.AppendCertsFromPEM(cert.Certificate) {
return nil, newError("failed to append cert").AtWarning()
}
}
return root, nil
}
// BuildCertificates builds a list of TLS certificates from proto definition.
func (c *Config) BuildCertificates() []xtls.Certificate {
certs := make([]xtls.Certificate, 0, len(c.Certificate))
for _, entry := range c.Certificate {
if entry.Usage != Certificate_ENCIPHERMENT {
continue
}
keyPair, err := xtls.X509KeyPair(entry.Certificate, entry.Key)
if err != nil {
newError("ignoring invalid X509 key pair").Base(err).AtWarning().WriteToLog()
continue
}
certs = append(certs, keyPair)
}
return certs
}
func isCertificateExpired(c *xtls.Certificate) bool {
if c.Leaf == nil && len(c.Certificate) > 0 {
if pc, err := x509.ParseCertificate(c.Certificate[0]); err == nil {
c.Leaf = pc
}
}
// If leaf is not there, the certificate is probably not used yet. We trust user to provide a valid certificate.
return c.Leaf != nil && c.Leaf.NotAfter.Before(time.Now().Add(-time.Minute))
}
func issueCertificate(rawCA *Certificate, domain string) (*xtls.Certificate, error) {
parent, err := cert.ParseCertificate(rawCA.Certificate, rawCA.Key)
if err != nil {
return nil, newError("failed to parse raw certificate").Base(err)
}
newCert, err := cert.Generate(parent, cert.CommonName(domain), cert.DNSNames(domain))
if err != nil {
return nil, newError("failed to generate new certificate for ", domain).Base(err)
}
newCertPEM, newKeyPEM := newCert.ToPEM()
cert, err := xtls.X509KeyPair(newCertPEM, newKeyPEM)
return &cert, err
}
func (c *Config) getCustomCA() []*Certificate {
certs := make([]*Certificate, 0, len(c.Certificate))
for _, certificate := range c.Certificate {
if certificate.Usage == Certificate_AUTHORITY_ISSUE {
certs = append(certs, certificate)
}
}
return certs
}
func getGetCertificateFunc(c *xtls.Config, ca []*Certificate) func(hello *xtls.ClientHelloInfo) (*xtls.Certificate, error) {
var access sync.RWMutex
return func(hello *xtls.ClientHelloInfo) (*xtls.Certificate, error) {
domain := hello.ServerName
certExpired := false
access.RLock()
certificate, found := c.NameToCertificate[domain]
access.RUnlock()
if found {
if !isCertificateExpired(certificate) {
return certificate, nil
}
certExpired = true
}
if certExpired {
newCerts := make([]xtls.Certificate, 0, len(c.Certificates))
access.Lock()
for _, certificate := range c.Certificates {
if !isCertificateExpired(&certificate) {
newCerts = append(newCerts, certificate)
}
}
c.Certificates = newCerts
access.Unlock()
}
var issuedCertificate *xtls.Certificate
// Create a new certificate from existing CA if possible
for _, rawCert := range ca {
if rawCert.Usage == Certificate_AUTHORITY_ISSUE {
newCert, err := issueCertificate(rawCert, domain)
if err != nil {
newError("failed to issue new certificate for ", domain).Base(err).WriteToLog()
continue
}
access.Lock()
c.Certificates = append(c.Certificates, *newCert)
issuedCertificate = &c.Certificates[len(c.Certificates)-1]
access.Unlock()
break
}
}
if issuedCertificate == nil {
return nil, newError("failed to create a new certificate for ", domain)
}
access.Lock()
c.BuildNameToCertificate()
access.Unlock()
return issuedCertificate, nil
}
}
func (c *Config) parseServerName() string {
return c.ServerName
}
// GetXTLSConfig converts this Config into xtls.Config.
func (c *Config) GetXTLSConfig(opts ...Option) *xtls.Config {
root, err := c.getCertPool()
if err != nil {
newError("failed to load system root certificate").AtError().Base(err).WriteToLog()
}
if c == nil {
return &xtls.Config{
ClientSessionCache: globalSessionCache,
RootCAs: root,
InsecureSkipVerify: false,
NextProtos: nil,
SessionTicketsDisabled: false,
}
}
config := &xtls.Config{
ClientSessionCache: globalSessionCache,
RootCAs: root,
InsecureSkipVerify: c.AllowInsecure,
NextProtos: c.NextProtocol,
SessionTicketsDisabled: c.DisableSessionResumption,
}
for _, opt := range opts {
opt(config)
}
config.Certificates = c.BuildCertificates()
config.BuildNameToCertificate()
caCerts := c.getCustomCA()
if len(caCerts) > 0 {
config.GetCertificate = getGetCertificateFunc(config, caCerts)
}
if sn := c.parseServerName(); len(sn) > 0 {
config.ServerName = sn
}
if len(config.NextProtos) == 0 {
config.NextProtos = []string{"h2", "http/1.1"}
}
return config
}
// Option for building XTLS config.
type Option func(*xtls.Config)
// WithDestination sets the server name in XTLS config.
func WithDestination(dest net.Destination) Option {
return func(config *xtls.Config) {
if dest.Address.Family().IsDomain() && config.ServerName == "" {
config.ServerName = dest.Address.Domain()
}
}
}
// WithNextProto sets the ALPN values in XTLS config.
func WithNextProto(protocol ...string) Option {
return func(config *xtls.Config) {
if len(config.NextProtos) == 0 {
config.NextProtos = protocol
}
}
}
// ConfigFromStreamSettings fetches Config from stream settings. Nil if not found.
func ConfigFromStreamSettings(settings *internet.MemoryStreamConfig) *Config {
if settings == nil {
return nil
}
config, ok := settings.SecuritySettings.(*Config)
if !ok {
return nil
}
return config
}