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Add REALITY ChaCha20-Poly1305 auth mode support

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This commit is contained in:
H1JK 2023-06-14 17:17:46 +08:00
parent 4f79bb7931
commit af28b99b2a
1 changed files with 19 additions and 10 deletions
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27
component/tls/reality.go
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@ -25,6 +25,7 @@ import (
utls "github.com/sagernet/utls"
"github.com/zhangyunhao116/fastrand"
"golang.org/x/crypto/chacha20poly1305"
"golang.org/x/crypto/curve25519"
"golang.org/x/crypto/hkdf"
"golang.org/x/net/http2"
@ -37,6 +38,9 @@ type RealityConfig struct {
ShortID [RealityMaxShortIDLen]byte
}
//go:linkname aesgcmPreferred crypto/tls.aesgcmPreferred
func aesgcmPreferred(ciphers []uint16) bool
func GetRealityConn(ctx context.Context, conn net.Conn, ClientFingerprint string, tlsConfig *tls.Config, realityConfig *RealityConfig) (net.Conn, error) {
if fingerprint, exists := GetFingerprint(ClientFingerprint); exists {
verifier := &realityVerifier{
@ -61,17 +65,17 @@ func GetRealityConn(ctx context.Context, conn net.Conn, ClientFingerprint string
}
hello := uConn.HandshakeState.Hello
for i := range hello.SessionId { // https://github.com/golang/go/issues/5373
hello.SessionId[i] = 0
rawSessionID := hello.Raw[39 : 39+32] // the location of session ID
for i := range rawSessionID { // https://github.com/golang/go/issues/5373
rawSessionID[i] = 0
}
copy(hello.Raw[39:], hello.SessionId)
binary.BigEndian.PutUint64(hello.SessionId, uint64(time.Now().Unix()))
copy(hello.SessionId[8:], realityConfig.ShortID[:])
hello.SessionId[0] = 1
hello.SessionId[1] = 8
hello.SessionId[2] = 0
copy(hello.SessionId[8:], realityConfig.ShortID[:])
hello.SessionId[2] = 2
//log.Debugln("REALITY hello.sessionId[:16]: %v", hello.SessionId[:16])
@ -84,9 +88,14 @@ func GetRealityConn(ctx context.Context, conn net.Conn, ClientFingerprint string
if err != nil {
return nil, err
}
var aeadCipher cipher.AEAD
if aesgcmPreferred(hello.CipherSuites) {
aesBlock, _ := aes.NewCipher(authKey)
aesGcmCipher, _ := cipher.NewGCM(aesBlock)
aesGcmCipher.Seal(hello.SessionId[:0], hello.Random[20:], hello.SessionId[:16], hello.Raw)
aeadCipher, _ = cipher.NewGCM(aesBlock)
} else {
aeadCipher, _ = chacha20poly1305.New(authKey)
}
aeadCipher.Seal(hello.SessionId[:0], hello.Random[20:], hello.SessionId[:16], hello.Raw)
copy(hello.Raw[39:], hello.SessionId)
//log.Debugln("REALITY hello.sessionId: %v", hello.SessionId)
//log.Debugln("REALITY uConn.AuthKey: %v", authKey)
@ -96,7 +105,7 @@ func GetRealityConn(ctx context.Context, conn net.Conn, ClientFingerprint string
return nil, err
}
log.Debugln("REALITY Authentication: %v", verifier.verified)
log.Debugln("REALITY Authentication: %v, AEAD: %T", verifier.verified, aeadCipher)
if !verifier.verified {
go realityClientFallback(uConn, uConfig.ServerName, clientID)
@ -137,7 +146,7 @@ type realityVerifier struct {
verified bool
}
var pOffset = utils.MustOK(reflect.TypeOf((*utls.UConn)(nil)).Elem().FieldByName("peerCertificates")).Offset
var pOffset = utils.MustOK(reflect.TypeOf((*utls.Conn)(nil)).Elem().FieldByName("peerCertificates")).Offset
func (c *realityVerifier) VerifyPeerCertificate(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
//p, _ := reflect.TypeOf(c.Conn).Elem().FieldByName("peerCertificates")