//go:build with_utls package tls import ( "context" "crypto/tls" "crypto/x509" "net" "net/netip" "os" "github.com/sagernet/sing-box/adapter" "github.com/sagernet/sing-box/option" E "github.com/sagernet/sing/common/exceptions" utls "github.com/refraction-networking/utls" ) type utlsClientConfig struct { config *utls.Config id utls.ClientHelloID } func (e *utlsClientConfig) NextProtos() []string { return e.config.NextProtos } func (e *utlsClientConfig) SetNextProtos(nextProto []string) { e.config.NextProtos = nextProto } func (e *utlsClientConfig) Config() (*STDConfig, error) { return nil, E.New("unsupported usage for uTLS") } func (e *utlsClientConfig) Client(conn net.Conn) Conn { return &utlsConnWrapper{utls.UClient(conn, e.config, e.id)} } type utlsConnWrapper struct { *utls.UConn } func (c *utlsConnWrapper) HandshakeContext(ctx context.Context) error { return c.Conn.Handshake() } func (c *utlsConnWrapper) ConnectionState() tls.ConnectionState { state := c.Conn.ConnectionState() return tls.ConnectionState{ Version: state.Version, HandshakeComplete: state.HandshakeComplete, DidResume: state.DidResume, CipherSuite: state.CipherSuite, NegotiatedProtocol: state.NegotiatedProtocol, NegotiatedProtocolIsMutual: state.NegotiatedProtocolIsMutual, ServerName: state.ServerName, PeerCertificates: state.PeerCertificates, VerifiedChains: state.VerifiedChains, SignedCertificateTimestamps: state.SignedCertificateTimestamps, OCSPResponse: state.OCSPResponse, TLSUnique: state.TLSUnique, } } func newUTLSClient(router adapter.Router, serverAddress string, options option.OutboundTLSOptions) (Config, error) { var serverName string if options.ServerName != "" { serverName = options.ServerName } else if serverAddress != "" { if _, err := netip.ParseAddr(serverName); err != nil { serverName = serverAddress } } if serverName == "" && !options.Insecure { return nil, E.New("missing server_name or insecure=true") } var tlsConfig utls.Config if options.DisableSNI { tlsConfig.ServerName = "127.0.0.1" } else { tlsConfig.ServerName = serverName } if options.Insecure { tlsConfig.InsecureSkipVerify = options.Insecure } else if options.DisableSNI { return nil, E.New("disable_sni is unsupported in uTLS") } if len(options.ALPN) > 0 { tlsConfig.NextProtos = options.ALPN } if options.MinVersion != "" { minVersion, err := ParseTLSVersion(options.MinVersion) if err != nil { return nil, E.Cause(err, "parse min_version") } tlsConfig.MinVersion = minVersion } if options.MaxVersion != "" { maxVersion, err := ParseTLSVersion(options.MaxVersion) if err != nil { return nil, E.Cause(err, "parse max_version") } tlsConfig.MaxVersion = maxVersion } if options.CipherSuites != nil { find: for _, cipherSuite := range options.CipherSuites { for _, tlsCipherSuite := range tls.CipherSuites() { if cipherSuite == tlsCipherSuite.Name { tlsConfig.CipherSuites = append(tlsConfig.CipherSuites, tlsCipherSuite.ID) continue find } } return nil, E.New("unknown cipher_suite: ", cipherSuite) } } var certificate []byte if options.Certificate != "" { certificate = []byte(options.Certificate) } else if options.CertificatePath != "" { content, err := os.ReadFile(options.CertificatePath) if err != nil { return nil, E.Cause(err, "read certificate") } certificate = content } if len(certificate) > 0 { certPool := x509.NewCertPool() if !certPool.AppendCertsFromPEM(certificate) { return nil, E.New("failed to parse certificate:\n\n", certificate) } tlsConfig.RootCAs = certPool } var id utls.ClientHelloID switch options.UTLS.Fingerprint { case "chrome", "": id = utls.HelloChrome_Auto case "firefox": id = utls.HelloFirefox_Auto case "ios": id = utls.HelloIOS_Auto case "android": id = utls.HelloAndroid_11_OkHttp case "random": id = utls.HelloRandomized } return &utlsClientConfig{&tlsConfig, id}, nil }