package inbound //go:generate go run github.com/xtls/xray-core/common/errors/errorgen import ( "bytes" "context" gotls "crypto/tls" "io" "reflect" "strconv" "strings" "syscall" "time" "unsafe" "github.com/pires/go-proxyproto" "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/buf" "github.com/xtls/xray-core/common/errors" "github.com/xtls/xray-core/common/log" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/common/protocol" "github.com/xtls/xray-core/common/retry" "github.com/xtls/xray-core/common/session" "github.com/xtls/xray-core/common/signal" "github.com/xtls/xray-core/common/task" "github.com/xtls/xray-core/core" "github.com/xtls/xray-core/features/dns" feature_inbound "github.com/xtls/xray-core/features/inbound" "github.com/xtls/xray-core/features/policy" "github.com/xtls/xray-core/features/routing" "github.com/xtls/xray-core/features/stats" "github.com/xtls/xray-core/proxy/vless" "github.com/xtls/xray-core/proxy/vless/encoding" "github.com/xtls/xray-core/transport/internet/reality" "github.com/xtls/xray-core/transport/internet/stat" "github.com/xtls/xray-core/transport/internet/tls" ) func init() { common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) { var dc dns.Client if err := core.RequireFeatures(ctx, func(d dns.Client) error { dc = d return nil }); err != nil { return nil, err } return New(ctx, config.(*Config), dc) })) } // Handler is an inbound connection handler that handles messages in VLess protocol. type Handler struct { inboundHandlerManager feature_inbound.Manager policyManager policy.Manager validator *vless.Validator dns dns.Client fallbacks map[string]map[string]map[string]*Fallback // or nil // regexps map[string]*regexp.Regexp // or nil } // New creates a new VLess inbound handler. func New(ctx context.Context, config *Config, dc dns.Client) (*Handler, error) { v := core.MustFromContext(ctx) handler := &Handler{ inboundHandlerManager: v.GetFeature(feature_inbound.ManagerType()).(feature_inbound.Manager), policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager), validator: new(vless.Validator), dns: dc, } for _, user := range config.Clients { u, err := user.ToMemoryUser() if err != nil { return nil, newError("failed to get VLESS user").Base(err).AtError() } if err := handler.AddUser(ctx, u); err != nil { return nil, newError("failed to initiate user").Base(err).AtError() } } if config.Fallbacks != nil { handler.fallbacks = make(map[string]map[string]map[string]*Fallback) // handler.regexps = make(map[string]*regexp.Regexp) for _, fb := range config.Fallbacks { if handler.fallbacks[fb.Name] == nil { handler.fallbacks[fb.Name] = make(map[string]map[string]*Fallback) } if handler.fallbacks[fb.Name][fb.Alpn] == nil { handler.fallbacks[fb.Name][fb.Alpn] = make(map[string]*Fallback) } handler.fallbacks[fb.Name][fb.Alpn][fb.Path] = fb /* if fb.Path != "" { if r, err := regexp.Compile(fb.Path); err != nil { return nil, newError("invalid path regexp").Base(err).AtError() } else { handler.regexps[fb.Path] = r } } */ } if handler.fallbacks[""] != nil { for name, apfb := range handler.fallbacks { if name != "" { for alpn := range handler.fallbacks[""] { if apfb[alpn] == nil { apfb[alpn] = make(map[string]*Fallback) } } } } } for _, apfb := range handler.fallbacks { if apfb[""] != nil { for alpn, pfb := range apfb { if alpn != "" { // && alpn != "h2" { for path, fb := range apfb[""] { if pfb[path] == nil { pfb[path] = fb } } } } } } if handler.fallbacks[""] != nil { for name, apfb := range handler.fallbacks { if name != "" { for alpn, pfb := range handler.fallbacks[""] { for path, fb := range pfb { if apfb[alpn][path] == nil { apfb[alpn][path] = fb } } } } } } } return handler, nil } func isMuxAndNotXUDP(request *protocol.RequestHeader, first *buf.Buffer) bool { if request.Command != protocol.RequestCommandMux { return false } if first.Len() < 7 { return true } firstBytes := first.Bytes() return !(firstBytes[2] == 0 && // ID high firstBytes[3] == 0 && // ID low firstBytes[6] == 2) // Network type: UDP } // Close implements common.Closable.Close(). func (h *Handler) Close() error { return errors.Combine(common.Close(h.validator)) } // AddUser implements proxy.UserManager.AddUser(). func (h *Handler) AddUser(ctx context.Context, u *protocol.MemoryUser) error { return h.validator.Add(u) } // RemoveUser implements proxy.UserManager.RemoveUser(). func (h *Handler) RemoveUser(ctx context.Context, e string) error { return h.validator.Del(e) } // Network implements proxy.Inbound.Network(). func (*Handler) Network() []net.Network { return []net.Network{net.Network_TCP, net.Network_UNIX} } // Process implements proxy.Inbound.Process(). func (h *Handler) Process(ctx context.Context, network net.Network, connection stat.Connection, dispatcher routing.Dispatcher) error { sid := session.ExportIDToError(ctx) iConn := connection statConn, ok := iConn.(*stat.CounterConnection) if ok { iConn = statConn.Connection } sessionPolicy := h.policyManager.ForLevel(0) if err := connection.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil { return newError("unable to set read deadline").Base(err).AtWarning() } first := buf.FromBytes(make([]byte, buf.Size)) first.Clear() firstLen, _ := first.ReadFrom(connection) newError("firstLen = ", firstLen).AtInfo().WriteToLog(sid) reader := &buf.BufferedReader{ Reader: buf.NewReader(connection), Buffer: buf.MultiBuffer{first}, } var request *protocol.RequestHeader var requestAddons *encoding.Addons var err error napfb := h.fallbacks isfb := napfb != nil if isfb && firstLen < 18 { err = newError("fallback directly") } else { request, requestAddons, isfb, err = encoding.DecodeRequestHeader(isfb, first, reader, h.validator) } if err != nil { if isfb { if err := connection.SetReadDeadline(time.Time{}); err != nil { newError("unable to set back read deadline").Base(err).AtWarning().WriteToLog(sid) } newError("fallback starts").Base(err).AtInfo().WriteToLog(sid) name := "" alpn := "" if tlsConn, ok := iConn.(*tls.Conn); ok { cs := tlsConn.ConnectionState() name = cs.ServerName alpn = cs.NegotiatedProtocol newError("realName = " + name).AtInfo().WriteToLog(sid) newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid) } else if realityConn, ok := iConn.(*reality.Conn); ok { cs := realityConn.ConnectionState() name = cs.ServerName alpn = cs.NegotiatedProtocol newError("realName = " + name).AtInfo().WriteToLog(sid) newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid) } name = strings.ToLower(name) alpn = strings.ToLower(alpn) if len(napfb) > 1 || napfb[""] == nil { if name != "" && napfb[name] == nil { match := "" for n := range napfb { if n != "" && strings.Contains(name, n) && len(n) > len(match) { match = n } } name = match } } if napfb[name] == nil { name = "" } apfb := napfb[name] if apfb == nil { return newError(`failed to find the default "name" config`).AtWarning() } if apfb[alpn] == nil { alpn = "" } pfb := apfb[alpn] if pfb == nil { return newError(`failed to find the default "alpn" config`).AtWarning() } path := "" if len(pfb) > 1 || pfb[""] == nil { /* if lines := bytes.Split(firstBytes, []byte{'\r', '\n'}); len(lines) > 1 { if s := bytes.Split(lines[0], []byte{' '}); len(s) == 3 { if len(s[0]) < 8 && len(s[1]) > 0 && len(s[2]) == 8 { newError("realPath = " + string(s[1])).AtInfo().WriteToLog(sid) for _, fb := range pfb { if fb.Path != "" && h.regexps[fb.Path].Match(s[1]) { path = fb.Path break } } } } } */ if firstLen >= 18 && first.Byte(4) != '*' { // not h2c firstBytes := first.Bytes() for i := 4; i <= 8; i++ { // 5 -> 9 if firstBytes[i] == '/' && firstBytes[i-1] == ' ' { search := len(firstBytes) if search > 64 { search = 64 // up to about 60 } for j := i + 1; j < search; j++ { k := firstBytes[j] if k == '\r' || k == '\n' { // avoid logging \r or \n break } if k == '?' || k == ' ' { path = string(firstBytes[i:j]) newError("realPath = " + path).AtInfo().WriteToLog(sid) if pfb[path] == nil { path = "" } break } } break } } } } fb := pfb[path] if fb == nil { return newError(`failed to find the default "path" config`).AtWarning() } ctx, cancel := context.WithCancel(ctx) timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle) ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer) var conn net.Conn if err := retry.ExponentialBackoff(5, 100).On(func() error { var dialer net.Dialer conn, err = dialer.DialContext(ctx, fb.Type, fb.Dest) if err != nil { return err } return nil }); err != nil { return newError("failed to dial to " + fb.Dest).Base(err).AtWarning() } defer conn.Close() serverReader := buf.NewReader(conn) serverWriter := buf.NewWriter(conn) postRequest := func() error { defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly) if fb.Xver != 0 { ipType := 4 remoteAddr, remotePort, err := net.SplitHostPort(connection.RemoteAddr().String()) if err != nil { ipType = 0 } localAddr, localPort, err := net.SplitHostPort(connection.LocalAddr().String()) if err != nil { ipType = 0 } if ipType == 4 { for i := 0; i < len(remoteAddr); i++ { if remoteAddr[i] == ':' { ipType = 6 break } } } pro := buf.New() defer pro.Release() switch fb.Xver { case 1: if ipType == 0 { pro.Write([]byte("PROXY UNKNOWN\r\n")) break } if ipType == 4 { pro.Write([]byte("PROXY TCP4 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n")) } else { pro.Write([]byte("PROXY TCP6 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n")) } case 2: pro.Write([]byte("\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A")) // signature if ipType == 0 { pro.Write([]byte("\x20\x00\x00\x00")) // v2 + LOCAL + UNSPEC + UNSPEC + 0 bytes break } if ipType == 4 { pro.Write([]byte("\x21\x11\x00\x0C")) // v2 + PROXY + AF_INET + STREAM + 12 bytes pro.Write(net.ParseIP(remoteAddr).To4()) pro.Write(net.ParseIP(localAddr).To4()) } else { pro.Write([]byte("\x21\x21\x00\x24")) // v2 + PROXY + AF_INET6 + STREAM + 36 bytes pro.Write(net.ParseIP(remoteAddr).To16()) pro.Write(net.ParseIP(localAddr).To16()) } p1, _ := strconv.ParseUint(remotePort, 10, 16) p2, _ := strconv.ParseUint(localPort, 10, 16) pro.Write([]byte{byte(p1 >> 8), byte(p1), byte(p2 >> 8), byte(p2)}) } if err := serverWriter.WriteMultiBuffer(buf.MultiBuffer{pro}); err != nil { return newError("failed to set PROXY protocol v", fb.Xver).Base(err).AtWarning() } } if err := buf.Copy(reader, serverWriter, buf.UpdateActivity(timer)); err != nil { return newError("failed to fallback request payload").Base(err).AtInfo() } return nil } writer := buf.NewWriter(connection) getResponse := func() error { defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly) if err := buf.Copy(serverReader, writer, buf.UpdateActivity(timer)); err != nil { return newError("failed to deliver response payload").Base(err).AtInfo() } return nil } if err := task.Run(ctx, task.OnSuccess(postRequest, task.Close(serverWriter)), task.OnSuccess(getResponse, task.Close(writer))); err != nil { common.Interrupt(serverReader) common.Interrupt(serverWriter) return newError("fallback ends").Base(err).AtInfo() } return nil } if errors.Cause(err) != io.EOF { log.Record(&log.AccessMessage{ From: connection.RemoteAddr(), To: "", Status: log.AccessRejected, Reason: err, }) err = newError("invalid request from ", connection.RemoteAddr()).Base(err).AtInfo() } return err } if err := connection.SetReadDeadline(time.Time{}); err != nil { newError("unable to set back read deadline").Base(err).AtWarning().WriteToLog(sid) } newError("received request for ", request.Destination()).AtInfo().WriteToLog(sid) inbound := session.InboundFromContext(ctx) if inbound == nil { panic("no inbound metadata") } inbound.User = request.User account := request.User.Account.(*vless.MemoryAccount) responseAddons := &encoding.Addons{ // Flow: requestAddons.Flow, } var netConn net.Conn var rawConn syscall.RawConn var input *bytes.Reader var rawInput *bytes.Buffer allowNoneFlow := false accountFlow := account.Flow flows := strings.Split(account.Flow, ",") for _, f := range flows { t := strings.TrimSpace(f) if t == "none" { allowNoneFlow = true } else { accountFlow = t } } switch requestAddons.Flow { case vless.XRV: if accountFlow == requestAddons.Flow { switch request.Command { case protocol.RequestCommandMux: return newError(requestAddons.Flow + " doesn't support Mux").AtWarning() case protocol.RequestCommandUDP: return newError(requestAddons.Flow + " doesn't support UDP").AtWarning() case protocol.RequestCommandTCP: var t reflect.Type var p uintptr if tlsConn, ok := iConn.(*tls.Conn); ok { if tlsConn.ConnectionState().Version != gotls.VersionTLS13 { return newError(`failed to use `+requestAddons.Flow+`, found outer tls version `, tlsConn.ConnectionState().Version).AtWarning() } netConn = tlsConn.NetConn() t = reflect.TypeOf(tlsConn.Conn).Elem() p = uintptr(unsafe.Pointer(tlsConn.Conn)) } else if realityConn, ok := iConn.(*reality.Conn); ok { netConn = realityConn.NetConn() t = reflect.TypeOf(realityConn.Conn).Elem() p = uintptr(unsafe.Pointer(realityConn.Conn)) } else if _, ok := iConn.(*tls.UConn); ok { return newError("XTLS only supports UTLS fingerprint for the outbound.").AtWarning() } else { return newError("XTLS only supports TCP, mKCP and DomainSocket for now.").AtWarning() } if pc, ok := netConn.(*proxyproto.Conn); ok { netConn = pc.Raw() // 8192 > 4096, there is no need to process pc's bufReader } if sc, ok := netConn.(syscall.Conn); ok { rawConn, _ = sc.SyscallConn() } i, _ := t.FieldByName("input") r, _ := t.FieldByName("rawInput") input = (*bytes.Reader)(unsafe.Pointer(p + i.Offset)) rawInput = (*bytes.Buffer)(unsafe.Pointer(p + r.Offset)) } } else { return newError(account.ID.String() + " is not able to use " + requestAddons.Flow).AtWarning() } case "", "none": if accountFlow == vless.XRV && !allowNoneFlow && (request.Command == protocol.RequestCommandTCP || isMuxAndNotXUDP(request, first)) { return newError(account.ID.String() + " is not able to use " + vless.XRV + ". Note the pure tls proxy has certain tls in tls characters. Append \",none\" in flow to suppress").AtWarning() } default: return newError("unknown request flow " + requestAddons.Flow).AtWarning() } if request.Command != protocol.RequestCommandMux { ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{ From: connection.RemoteAddr(), To: request.Destination(), Status: log.AccessAccepted, Reason: "", Email: request.User.Email, }) } sessionPolicy = h.policyManager.ForLevel(request.User.Level) ctx, cancel := context.WithCancel(ctx) timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle) ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer) link, err := dispatcher.Dispatch(ctx, request.Destination()) if err != nil { return newError("failed to dispatch request to ", request.Destination()).Base(err).AtWarning() } serverReader := link.Reader // .(*pipe.Reader) serverWriter := link.Writer // .(*pipe.Writer) enableXtls := false isTLS12orAbove := false isTLS := false var cipher uint16 = 0 var remainingServerHello int32 = -1 numberOfPacketToFilter := 8 postRequest := func() error { defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly) // default: clientReader := reader clientReader := encoding.DecodeBodyAddons(reader, request, requestAddons) var err error if rawConn != nil { var counter stats.Counter if statConn != nil { counter = statConn.ReadCounter } // TODO enable splice ctx = session.ContextWithInbound(ctx, nil) err = encoding.XtlsRead(clientReader, serverWriter, timer, netConn, rawConn, input, rawInput, counter, ctx, account.ID.Bytes(), &numberOfPacketToFilter, &enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello) } else { // from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBufer err = buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer)) } if err != nil { return newError("failed to transfer request payload").Base(err).AtInfo() } return nil } getResponse := func() error { defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly) bufferWriter := buf.NewBufferedWriter(buf.NewWriter(connection)) if err := encoding.EncodeResponseHeader(bufferWriter, request, responseAddons); err != nil { return newError("failed to encode response header").Base(err).AtWarning() } // default: clientWriter := bufferWriter clientWriter := encoding.EncodeBodyAddons(bufferWriter, request, responseAddons) userUUID := account.ID.Bytes() multiBuffer, err1 := serverReader.ReadMultiBuffer() if err1 != nil { return err1 // ... } if requestAddons.Flow == vless.XRV { encoding.XtlsFilterTls(multiBuffer, &numberOfPacketToFilter, &enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello, ctx) multiBuffer = encoding.ReshapeMultiBuffer(ctx, multiBuffer) for i, b := range multiBuffer { multiBuffer[i] = encoding.XtlsPadding(b, encoding.CommandPaddingContinue, &userUUID, isTLS, ctx) } } if err := clientWriter.WriteMultiBuffer(multiBuffer); err != nil { return err // ... } // Flush; bufferWriter.WriteMultiBufer now is bufferWriter.writer.WriteMultiBuffer if err := bufferWriter.SetBuffered(false); err != nil { return newError("failed to write A response payload").Base(err).AtWarning() } var err error if rawConn != nil && requestAddons.Flow == vless.XRV { var counter stats.Counter if statConn != nil { counter = statConn.WriteCounter } err = encoding.XtlsWrite(serverReader, clientWriter, timer, netConn, counter, ctx, &numberOfPacketToFilter, &enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello) } else { // from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBufer err = buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer)) } if err != nil { return newError("failed to transfer response payload").Base(err).AtInfo() } // Indicates the end of response payload. switch responseAddons.Flow { default: } return nil } if err := task.Run(ctx, task.OnSuccess(postRequest, task.Close(serverWriter)), getResponse); err != nil { common.Interrupt(serverReader) common.Interrupt(serverWriter) return newError("connection ends").Base(err).AtInfo() } return nil }