Add uTLS fingerprints support (#451)

go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/miekg/dns v1.1.40
 	github.com/pelletier/go-toml v1.8.1
 	github.com/pires/go-proxyproto v0.5.0
+	github.com/refraction-networking/utls v0.0.0-20201210053706-2179f286686b
 	github.com/seiflotfy/cuckoofilter v0.0.0-20201222105146-bc6005554a0c
 	github.com/stretchr/testify v1.7.0
 	github.com/xtls/go v0.0.0-20201118062508-3632bf3b7499

go.sum

@@ -139,6 +139,8 @@ github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910/go.mod h1:
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/common v0.0.0-20180801064454-c7de2306084e/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
 github.com/prometheus/procfs v0.0.0-20180725123919-05ee40e3a273/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
+github.com/refraction-networking/utls v0.0.0-20201210053706-2179f286686b h1:lzo71oHzQEz0fKMSjR0BpVzuh2hOHvJTxnN3Rnikmtg=
+github.com/refraction-networking/utls v0.0.0-20201210053706-2179f286686b/go.mod h1:tz9gX959MEFfFN5whTIocCLUG57WiILqtdVxI8c6Wj0=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
 github.com/seiflotfy/cuckoofilter v0.0.0-20201222105146-bc6005554a0c h1:pqy40B3MQWYrza7YZXOXgl0Nf0QGFqrOC0BKae1UNAA=
 github.com/seiflotfy/cuckoofilter v0.0.0-20201222105146-bc6005554a0c/go.mod h1:bR6DqgcAl1zTcOX8/pE2Qkj9XO00eCNqmKb7lXP8EAg=

infra/conf/transport_internet.go

@@ -321,6 +321,7 @@ type TLSConfig struct {
 	MaxVersion               string           `json:"maxVersion"`
 	CipherSuites             string           `json:"cipherSuites"`
 	PreferServerCipherSuites bool             `json:"preferServerCipherSuites"`
+	Fingerprint              string           `json:"fingerprint"`
 }
 
 // Build implements Buildable.
@@ -348,6 +349,7 @@ func (c *TLSConfig) Build() (proto.Message, error) {
 	config.MaxVersion = c.MaxVersion
 	config.CipherSuites = c.CipherSuites
 	config.PreferServerCipherSuites = c.PreferServerCipherSuites
+	config.Fingerprint = strings.ToLower(c.Fingerprint)
 	return config, nil
 }
 

transport/internet/tcp/dialer.go

@@ -3,6 +3,8 @@ package tcp
 import (
 	"context"
 
+	utls "github.com/refraction-networking/utls"
+
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
@@ -21,14 +23,11 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 
 	if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
 		tlsConfig := config.GetTLSConfig(tls.WithDestination(dest))
-		/*
-			if config.IsExperiment8357() {
-				conn = tls.UClient(conn, tlsConfig)
-			} else {
-				conn = tls.Client(conn, tlsConfig)
-			}
-		*/
-		conn = tls.Client(conn, tlsConfig)
+		if fingerprint, ok := tls.Fingerprints[config.Fingerprint]; ok {
+			conn = utls.UClient(conn, tls.CopyConfig(tlsConfig), fingerprint)
+		} else {
+			conn = tls.Client(conn, tlsConfig)
+		}
 	} else if config := xtls.ConfigFromStreamSettings(streamSettings); config != nil {
 		xtlsConfig := config.GetXTLSConfig(xtls.WithDestination(dest))
 		conn = xtls.Client(conn, xtlsConfig)

transport/internet/tls/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.14.0
+// 	protoc        v3.15.6
 // source: transport/internet/tls/config.proto
 
 package tls
@@ -200,6 +200,8 @@ type Config struct {
 	CipherSuites string `protobuf:"bytes,9,opt,name=cipher_suites,json=cipherSuites,proto3" json:"cipher_suites,omitempty"`
 	// Whether the server selects its most preferred ciphersuite.
 	PreferServerCipherSuites bool `protobuf:"varint,10,opt,name=prefer_server_cipher_suites,json=preferServerCipherSuites,proto3" json:"prefer_server_cipher_suites,omitempty"`
+	// TLS Client Hello fingerprint (uTLS).
+	Fingerprint string `protobuf:"bytes,11,opt,name=fingerprint,proto3" json:"fingerprint,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -304,6 +306,13 @@ func (x *Config) GetPreferServerCipherSuites() bool {
 	return false
 }
 
+func (x *Config) GetFingerprint() string {
+	if x != nil {
+		return x.Fingerprint
+	}
+	return ""
+}
+
 var File_transport_internet_tls_config_proto protoreflect.FileDescriptor
 
 var file_transport_internet_tls_config_proto_rawDesc = []byte{
@@ -333,7 +342,7 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
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+	0x49, 0x53, 0x53, 0x55, 0x45, 0x10, 0x02, 0x22, 0xf5, 0x03, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66,
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@@ -362,15 +371,17 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
 	0x0a, 0x1b, 0x70, 0x72, 0x65, 0x66, 0x65, 0x72, 0x5f, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x5f,
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 }
 
 var (

transport/internet/tls/config.proto

@@ -64,4 +64,7 @@ message Config {
 
   // Whether the server selects its most preferred ciphersuite.
   bool prefer_server_cipher_suites = 10;
+
+  // TLS Client Hello fingerprint (uTLS).
+  string fingerprint = 11;
 }

transport/internet/tls/tls.go

@@ -3,6 +3,8 @@ package tls
 import (
 	"crypto/tls"
 
+	utls "github.com/refraction-networking/utls"
+
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/net"
 )
@@ -41,23 +43,24 @@ func Client(c net.Conn, config *tls.Config) net.Conn {
 	return &Conn{Conn: tlsConn}
 }
 
-/*
-func copyConfig(c *tls.Config) *utls.Config {
+var Fingerprints = map[string]utls.ClientHelloID{
+	"chrome":     utls.HelloChrome_Auto,
+	"firefox":    utls.HelloFirefox_Auto,
+	"safari":     utls.HelloIOS_Auto,
+	"randomized": utls.HelloRandomized,
+}
+
+func CopyConfig(c *tls.Config) *utls.Config {
 	return &utls.Config{
+		RootCAs:            c.RootCAs,
 		NextProtos:         c.NextProtos,
 		ServerName:         c.ServerName,
 		InsecureSkipVerify: c.InsecureSkipVerify,
-		MinVersion:         utls.VersionTLS12,
-		MaxVersion:         utls.VersionTLS12,
+		MinVersion:         c.MinVersion,
+		MaxVersion:         c.MaxVersion,
 	}
 }
 
-func UClient(c net.Conn, config *tls.Config) net.Conn {
-	uConfig := copyConfig(config)
-	return utls.Client(c, uConfig)
-}
-*/
-
 // Server initiates a TLS server handshake on the given connection.
 func Server(c net.Conn, config *tls.Config) net.Conn {
 	tlsConn := tls.Server(c, config)