Refine fingerprints

Fixes https://github.com/XTLS/Xray-core/issues/1577

infra/conf/transport_internet.go

@@ -379,6 +379,9 @@ func (c *TLSConfig) Build() (proto.Message, error) {
 	config.CipherSuites = c.CipherSuites
 	config.PreferServerCipherSuites = c.PreferServerCipherSuites
 	config.Fingerprint = strings.ToLower(c.Fingerprint)
+	if config.Fingerprint != "" && tls.GetFingerprint(config.Fingerprint) == nil {
+		return nil, newError(`unknown fingerprint: `, config.Fingerprint)
+	}
 	config.RejectUnknownSni = c.RejectUnknownSNI
 
 	if c.PinnedPeerCertificateChainSha256 != nil {

transport/internet/grpc/dial.go

@@ -122,7 +122,7 @@ func getGrpcClient(ctx context.Context, dest net.Destination, streamSettings *in
 
 	if tlsConfig != nil {
 		var transportCredential credentials.TransportCredentials
-		if fingerprint, exists := tls.GetFingerprint(ctx, tlsConfig.Fingerprint); exists {
+		if fingerprint := tls.GetFingerprint(tlsConfig.Fingerprint); fingerprint != nil {
 			transportCredential = tls.NewGrpcUtls(tlsConfig.GetTLSConfig(), fingerprint)
 		} else { // Fallback to normal gRPC TLS
 			transportCredential = credentials.NewTLS(tlsConfig.GetTLSConfig())

transport/internet/http/dialer.go

@@ -75,7 +75,7 @@ func getHTTPClient(ctx context.Context, dest net.Destination, streamSettings *in
 			}
 
 			var cn tls.Interface
-			if fingerprint, ok := tls.GetFingerprint(ctx, tlsConfigs.Fingerprint); ok {
+			if fingerprint := tls.GetFingerprint(tlsConfigs.Fingerprint); fingerprint != nil {
 				cn = tls.UClient(pconn, tlsConfig, fingerprint).(*tls.UConn)
 			} else {
 				cn = tls.Client(pconn, tlsConfig).(*tls.Conn)

transport/internet/tcp/dialer.go

@@ -22,7 +22,7 @@ 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 fingerprint, ok := tls.GetFingerprint(ctx, config.Fingerprint); ok {
+		if fingerprint := tls.GetFingerprint(config.Fingerprint); fingerprint != nil {
 			conn = tls.UClient(conn, tlsConfig, fingerprint)
 			if err := conn.(*tls.UConn).Handshake(); err != nil {
 				return nil, err

transport/internet/tls/tls.go

@@ -1,7 +1,6 @@
 package tls
 
 import (
-	"context"
 	"crypto/rand"
 	"crypto/tls"
 	"math/big"
@@ -9,15 +8,12 @@ import (
 	utls "github.com/refraction-networking/utls"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/session"
 )
 
 //go:generate go run github.com/xtls/xray-core/common/errors/errorgen
 
 var _ buf.Writer = (*Conn)(nil)
 
-var XrayRandom *utls.ClientHelloID
-
 type Conn struct {
 	*tls.Conn
 }
@@ -118,58 +114,51 @@ func copyConfig(c *tls.Config) *utls.Config {
 	}
 }
 
-func GetFingerprint(ctx context.Context, config string) (*utls.ClientHelloID, bool) {
+func init() {
-	if XrayRandom == nil {
+	bigInt, _ := rand.Int(rand.Reader, big.NewInt(int64(len(ModernFingerprints))))
-		// lazy init
+	stopAt := int(bigInt.Int64())
-		for k, v := range FingerprintsForRNG {
+	i := 0
-			Fingerprints[k] = v
+	for _, v := range ModernFingerprints {
-		}
+		if i == stopAt {
-		big, err := rand.Int(rand.Reader, big.NewInt(int64(len(FingerprintsForRNG))))
+			PresetFingerprints["random"] = v
-		if err != nil {
-			newError("failed to generate xray random fingerprint").Base(err).WriteToLog(session.ExportIDToError(ctx))
-		}
-		var i = int(big.Int64())
-		count := 0
-		for k, v := range FingerprintsForRNG {
-			if count == i {
-				newError("xray random fingerprint: ", k).WriteToLog(session.ExportIDToError(ctx))
-				XrayRandom = v
 			break
 		}
-			count++
+		i++
 	}
-	}
-	if config == "random" {
-		return XrayRandom, true
-	}
-	fingerprint, ok := Fingerprints[config]
-	return fingerprint, ok
 }
 
-var Fingerprints = map[string]*utls.ClientHelloID{
+func GetFingerprint(name string) (fingerprint *utls.ClientHelloID) {
+	if name == "" {
+		return
+	}
+	if fingerprint = PresetFingerprints[name]; fingerprint != nil {
+		return
+	}
+	if fingerprint = ModernFingerprints[name]; fingerprint != nil {
+		return
+	}
+	if fingerprint = OtherFingerprints[name]; fingerprint != nil {
+		return
+	}
+	return
+}
+
+var PresetFingerprints = map[string]*utls.ClientHelloID{
+	// Recommended preset options in GUI clients
 	"chrome":     &utls.HelloChrome_Auto,
 	"firefox":    &utls.HelloFirefox_Auto,
 	"safari":     &utls.HelloSafari_Auto,
+	"ios":        &utls.HelloIOS_Auto,
+	"android":    &utls.HelloAndroid_11_OkHttp,
+	"edge":       &utls.HelloEdge_Auto,
+	"360":        &utls.Hello360_Auto,
+	"qq":         &utls.HelloQQ_Auto,
+	"random":     nil,
 	"randomized": &utls.HelloRandomized,
-	// This is a bit lame, but it seems there is no good way to reflect variables from Golang package
-	// We don't RNG for go, randomized, or fingerprints that is more than 4 years old
-	"hellogolang":           &utls.HelloGolang,
-	"hellorandomized":       &utls.HelloRandomized,
-	"hellorandomizedalpn":   &utls.HelloRandomizedALPN,
-	"hellorandomizednoalpn": &utls.HelloRandomizedNoALPN,
-	"hellofirefox_55":       &utls.HelloFirefox_55,
-	"hellofirefox_56":       &utls.HelloFirefox_56,
-	"hellofirefox_63":       &utls.HelloFirefox_63,
-	"hellofirefox_65":       &utls.HelloFirefox_65,
-	"hellochrome_58":        &utls.HelloChrome_58,
-	"hellochrome_62":        &utls.HelloChrome_62,
-	"hellochrome_70":        &utls.HelloChrome_70,
-	"hellochrome_72":        &utls.HelloChrome_72,
-	"helloios_11_1":         &utls.HelloIOS_11_1,
-	"hello360_7_5":          &utls.Hello360_7_5,
 }
 
-var FingerprintsForRNG = map[string]*utls.ClientHelloID{
+var ModernFingerprints = map[string]*utls.ClientHelloID{
+	// One of these will be chosen as `random` at startup
 	"hellofirefox_auto":       &utls.HelloFirefox_Auto,
 	"hellofirefox_99":         &utls.HelloFirefox_99,
 	"hellofirefox_102":        &utls.HelloFirefox_102,
@@ -197,6 +186,24 @@ var FingerprintsForRNG = map[string]*utls.ClientHelloID{
 	"helloqq_11_1":            &utls.HelloQQ_11_1,
 }
 
+var OtherFingerprints = map[string]*utls.ClientHelloID{
+	// Golang, randomized, and fingerprints that are more than 4 years old
+	"hellogolang":           &utls.HelloGolang,
+	"hellorandomized":       &utls.HelloRandomized,
+	"hellorandomizedalpn":   &utls.HelloRandomizedALPN,
+	"hellorandomizednoalpn": &utls.HelloRandomizedNoALPN,
+	"hellofirefox_55":       &utls.HelloFirefox_55,
+	"hellofirefox_56":       &utls.HelloFirefox_56,
+	"hellofirefox_63":       &utls.HelloFirefox_63,
+	"hellofirefox_65":       &utls.HelloFirefox_65,
+	"hellochrome_58":        &utls.HelloChrome_58,
+	"hellochrome_62":        &utls.HelloChrome_62,
+	"hellochrome_70":        &utls.HelloChrome_70,
+	"hellochrome_72":        &utls.HelloChrome_72,
+	"helloios_11_1":         &utls.HelloIOS_11_1,
+	"hello360_7_5":          &utls.Hello360_7_5,
+}
+
 type Interface interface {
 	net.Conn
 	Handshake() error

transport/internet/websocket/dialer.go

@@ -86,7 +86,7 @@ func dialWebSocket(ctx context.Context, dest net.Destination, streamSettings *in
 		protocol = "wss"
 		tlsConfig := config.GetTLSConfig(tls.WithDestination(dest), tls.WithNextProto("http/1.1"))
 		dialer.TLSClientConfig = tlsConfig
-		if fingerprint, exists := tls.GetFingerprint(ctx, config.Fingerprint); exists {
+		if fingerprint := tls.GetFingerprint(config.Fingerprint); fingerprint != nil {
 			dialer.NetDialTLSContext = func(_ context.Context, _, addr string) (gonet.Conn, error) {
 				// Like the NetDial in the dialer
 				pconn, err := internet.DialSystem(ctx, dest, streamSettings.SocketSettings)