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523 lines
15 KiB
523 lines
15 KiB
package trojan
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import (
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"context"
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"io"
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"strconv"
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"strings"
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"time"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/log"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/protocol"
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udp_proto "github.com/xtls/xray-core/common/protocol/udp"
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"github.com/xtls/xray-core/common/retry"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/common/signal"
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"github.com/xtls/xray-core/common/task"
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"github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/features/policy"
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"github.com/xtls/xray-core/features/routing"
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"github.com/xtls/xray-core/transport/internet/reality"
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"github.com/xtls/xray-core/transport/internet/stat"
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"github.com/xtls/xray-core/transport/internet/tls"
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"github.com/xtls/xray-core/transport/internet/udp"
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)
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func init() {
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common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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return NewServer(ctx, config.(*ServerConfig))
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}))
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}
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// Server is an inbound connection handler that handles messages in trojan protocol.
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type Server struct {
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policyManager policy.Manager
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validator *Validator
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fallbacks map[string]map[string]map[string]*Fallback // or nil
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cone bool
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}
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// NewServer creates a new trojan inbound handler.
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func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
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validator := new(Validator)
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for _, user := range config.Users {
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u, err := user.ToMemoryUser()
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if err != nil {
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return nil, errors.New("failed to get trojan user").Base(err).AtError()
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}
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if err := validator.Add(u); err != nil {
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return nil, errors.New("failed to add user").Base(err).AtError()
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}
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}
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v := core.MustFromContext(ctx)
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server := &Server{
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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validator: validator,
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cone: ctx.Value("cone").(bool),
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}
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if config.Fallbacks != nil {
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server.fallbacks = make(map[string]map[string]map[string]*Fallback)
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for _, fb := range config.Fallbacks {
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if server.fallbacks[fb.Name] == nil {
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server.fallbacks[fb.Name] = make(map[string]map[string]*Fallback)
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}
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if server.fallbacks[fb.Name][fb.Alpn] == nil {
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server.fallbacks[fb.Name][fb.Alpn] = make(map[string]*Fallback)
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}
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server.fallbacks[fb.Name][fb.Alpn][fb.Path] = fb
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}
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if server.fallbacks[""] != nil {
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for name, apfb := range server.fallbacks {
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if name != "" {
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for alpn := range server.fallbacks[""] {
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if apfb[alpn] == nil {
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apfb[alpn] = make(map[string]*Fallback)
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}
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}
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}
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}
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}
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for _, apfb := range server.fallbacks {
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if apfb[""] != nil {
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for alpn, pfb := range apfb {
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if alpn != "" { // && alpn != "h2" {
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for path, fb := range apfb[""] {
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if pfb[path] == nil {
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pfb[path] = fb
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}
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}
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}
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}
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}
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}
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if server.fallbacks[""] != nil {
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for name, apfb := range server.fallbacks {
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if name != "" {
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for alpn, pfb := range server.fallbacks[""] {
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for path, fb := range pfb {
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if apfb[alpn][path] == nil {
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apfb[alpn][path] = fb
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}
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}
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}
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}
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}
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}
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}
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return server, nil
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}
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// AddUser implements proxy.UserManager.AddUser().
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func (s *Server) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
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return s.validator.Add(u)
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}
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// RemoveUser implements proxy.UserManager.RemoveUser().
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func (s *Server) RemoveUser(ctx context.Context, e string) error {
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return s.validator.Del(e)
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}
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// Network implements proxy.Inbound.Network().
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func (s *Server) Network() []net.Network {
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return []net.Network{net.Network_TCP, net.Network_UNIX}
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}
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// Process implements proxy.Inbound.Process().
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func (s *Server) Process(ctx context.Context, network net.Network, conn stat.Connection, dispatcher routing.Dispatcher) error {
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iConn := conn
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statConn, ok := iConn.(*stat.CounterConnection)
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if ok {
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iConn = statConn.Connection
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}
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sessionPolicy := s.policyManager.ForLevel(0)
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if err := conn.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil {
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return errors.New("unable to set read deadline").Base(err).AtWarning()
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}
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first := buf.FromBytes(make([]byte, buf.Size))
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first.Clear()
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firstLen, err := first.ReadFrom(conn)
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if err != nil {
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return errors.New("failed to read first request").Base(err)
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}
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errors.LogInfo(ctx, "firstLen = ", firstLen)
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bufferedReader := &buf.BufferedReader{
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Reader: buf.NewReader(conn),
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Buffer: buf.MultiBuffer{first},
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}
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var user *protocol.MemoryUser
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napfb := s.fallbacks
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isfb := napfb != nil
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shouldFallback := false
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if firstLen < 58 || first.Byte(56) != '\r' {
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// invalid protocol
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err = errors.New("not trojan protocol")
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log.Record(&log.AccessMessage{
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From: conn.RemoteAddr(),
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To: "",
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Status: log.AccessRejected,
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Reason: err,
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})
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shouldFallback = true
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} else {
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user = s.validator.Get(hexString(first.BytesTo(56)))
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if user == nil {
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// invalid user, let's fallback
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err = errors.New("not a valid user")
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log.Record(&log.AccessMessage{
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From: conn.RemoteAddr(),
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To: "",
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Status: log.AccessRejected,
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Reason: err,
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})
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shouldFallback = true
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}
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}
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if isfb && shouldFallback {
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return s.fallback(ctx, err, sessionPolicy, conn, iConn, napfb, first, firstLen, bufferedReader)
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} else if shouldFallback {
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return errors.New("invalid protocol or invalid user")
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}
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clientReader := &ConnReader{Reader: bufferedReader}
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if err := clientReader.ParseHeader(); err != nil {
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log.Record(&log.AccessMessage{
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From: conn.RemoteAddr(),
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To: "",
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Status: log.AccessRejected,
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Reason: err,
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})
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return errors.New("failed to create request from: ", conn.RemoteAddr()).Base(err)
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}
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destination := clientReader.Target
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if err := conn.SetReadDeadline(time.Time{}); err != nil {
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return errors.New("unable to set read deadline").Base(err).AtWarning()
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}
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inbound := session.InboundFromContext(ctx)
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inbound.Name = "trojan"
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inbound.CanSpliceCopy = 3
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inbound.User = user
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sessionPolicy = s.policyManager.ForLevel(user.Level)
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if destination.Network == net.Network_UDP { // handle udp request
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return s.handleUDPPayload(ctx, &PacketReader{Reader: clientReader}, &PacketWriter{Writer: conn}, dispatcher)
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}
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ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
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From: conn.RemoteAddr(),
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To: destination,
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Status: log.AccessAccepted,
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Reason: "",
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Email: user.Email,
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})
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errors.LogInfo(ctx, "received request for ", destination)
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return s.handleConnection(ctx, sessionPolicy, destination, clientReader, buf.NewWriter(conn), dispatcher)
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}
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func (s *Server) handleUDPPayload(ctx context.Context, clientReader *PacketReader, clientWriter *PacketWriter, dispatcher routing.Dispatcher) error {
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udpServer := udp.NewDispatcher(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
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udpPayload := packet.Payload
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if udpPayload.UDP == nil {
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udpPayload.UDP = &packet.Source
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}
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if err := clientWriter.WriteMultiBuffer(buf.MultiBuffer{udpPayload}); err != nil {
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errors.LogWarningInner(ctx, err, "failed to write response")
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}
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})
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inbound := session.InboundFromContext(ctx)
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user := inbound.User
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var dest *net.Destination
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for {
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select {
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case <-ctx.Done():
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return nil
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default:
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mb, err := clientReader.ReadMultiBuffer()
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if err != nil {
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if errors.Cause(err) != io.EOF {
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return errors.New("unexpected EOF").Base(err)
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}
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return nil
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}
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mb2, b := buf.SplitFirst(mb)
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if b == nil {
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continue
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}
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destination := *b.UDP
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currentPacketCtx := ctx
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if inbound.Source.IsValid() {
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currentPacketCtx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
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From: inbound.Source,
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To: destination,
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Status: log.AccessAccepted,
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Reason: "",
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Email: user.Email,
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})
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}
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errors.LogInfo(ctx, "tunnelling request to ", destination)
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if !s.cone || dest == nil {
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dest = &destination
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}
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udpServer.Dispatch(currentPacketCtx, *dest, b) // first packet
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for _, payload := range mb2 {
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udpServer.Dispatch(currentPacketCtx, *dest, payload)
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}
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}
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}
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}
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func (s *Server) handleConnection(ctx context.Context, sessionPolicy policy.Session,
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destination net.Destination,
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clientReader buf.Reader,
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clientWriter buf.Writer, dispatcher routing.Dispatcher,
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) error {
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
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link, err := dispatcher.Dispatch(ctx, destination)
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if err != nil {
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return errors.New("failed to dispatch request to ", destination).Base(err)
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}
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requestDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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if buf.Copy(clientReader, link.Writer, buf.UpdateActivity(timer)) != nil {
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return errors.New("failed to transfer request").Base(err)
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}
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return nil
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}
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responseDone := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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if err := buf.Copy(link.Reader, clientWriter, buf.UpdateActivity(timer)); err != nil {
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return errors.New("failed to write response").Base(err)
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}
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return nil
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}
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requestDonePost := task.OnSuccess(requestDone, task.Close(link.Writer))
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if err := task.Run(ctx, requestDonePost, responseDone); err != nil {
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common.Must(common.Interrupt(link.Reader))
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common.Must(common.Interrupt(link.Writer))
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return errors.New("connection ends").Base(err)
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}
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return nil
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}
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func (s *Server) fallback(ctx context.Context, err error, sessionPolicy policy.Session, connection stat.Connection, iConn stat.Connection, napfb map[string]map[string]map[string]*Fallback, first *buf.Buffer, firstLen int64, reader buf.Reader) error {
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if err := connection.SetReadDeadline(time.Time{}); err != nil {
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errors.LogWarningInner(ctx, err, "unable to set back read deadline")
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}
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errors.LogInfoInner(ctx, err, "fallback starts")
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name := ""
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alpn := ""
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if tlsConn, ok := iConn.(*tls.Conn); ok {
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cs := tlsConn.ConnectionState()
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name = cs.ServerName
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alpn = cs.NegotiatedProtocol
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errors.LogInfo(ctx, "realName = " + name)
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errors.LogInfo(ctx, "realAlpn = " + alpn)
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} else if realityConn, ok := iConn.(*reality.Conn); ok {
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cs := realityConn.ConnectionState()
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name = cs.ServerName
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alpn = cs.NegotiatedProtocol
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errors.LogInfo(ctx, "realName = " + name)
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errors.LogInfo(ctx, "realAlpn = " + alpn)
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}
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name = strings.ToLower(name)
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alpn = strings.ToLower(alpn)
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if len(napfb) > 1 || napfb[""] == nil {
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if name != "" && napfb[name] == nil {
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match := ""
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for n := range napfb {
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if n != "" && strings.Contains(name, n) && len(n) > len(match) {
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match = n
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}
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}
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name = match
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}
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}
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if napfb[name] == nil {
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name = ""
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}
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apfb := napfb[name]
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if apfb == nil {
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return errors.New(`failed to find the default "name" config`).AtWarning()
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}
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if apfb[alpn] == nil {
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alpn = ""
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}
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pfb := apfb[alpn]
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if pfb == nil {
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return errors.New(`failed to find the default "alpn" config`).AtWarning()
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}
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path := ""
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if len(pfb) > 1 || pfb[""] == nil {
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if firstLen >= 18 && first.Byte(4) != '*' { // not h2c
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firstBytes := first.Bytes()
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for i := 4; i <= 8; i++ { // 5 -> 9
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if firstBytes[i] == '/' && firstBytes[i-1] == ' ' {
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search := len(firstBytes)
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if search > 64 {
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search = 64 // up to about 60
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}
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for j := i + 1; j < search; j++ {
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k := firstBytes[j]
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if k == '\r' || k == '\n' { // avoid logging \r or \n
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break
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}
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if k == '?' || k == ' ' {
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path = string(firstBytes[i:j])
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errors.LogInfo(ctx, "realPath = " + path)
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if pfb[path] == nil {
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path = ""
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}
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break
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}
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}
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break
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}
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}
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}
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}
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fb := pfb[path]
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if fb == nil {
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return errors.New(`failed to find the default "path" config`).AtWarning()
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}
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
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var conn net.Conn
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if err := retry.ExponentialBackoff(5, 100).On(func() error {
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var dialer net.Dialer
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conn, err = dialer.DialContext(ctx, fb.Type, fb.Dest)
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if err != nil {
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return err
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}
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return nil
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}); err != nil {
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return errors.New("failed to dial to " + fb.Dest).Base(err).AtWarning()
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}
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defer conn.Close()
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serverReader := buf.NewReader(conn)
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serverWriter := buf.NewWriter(conn)
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postRequest := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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if fb.Xver != 0 {
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ipType := 4
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remoteAddr, remotePort, err := net.SplitHostPort(connection.RemoteAddr().String())
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if err != nil {
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ipType = 0
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}
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localAddr, localPort, err := net.SplitHostPort(connection.LocalAddr().String())
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if err != nil {
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ipType = 0
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}
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if ipType == 4 {
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for i := 0; i < len(remoteAddr); i++ {
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if remoteAddr[i] == ':' {
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ipType = 6
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break
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}
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}
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}
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pro := buf.New()
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defer pro.Release()
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switch fb.Xver {
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case 1:
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if ipType == 0 {
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common.Must2(pro.Write([]byte("PROXY UNKNOWN\r\n")))
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break
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}
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if ipType == 4 {
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common.Must2(pro.Write([]byte("PROXY TCP4 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n")))
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} else {
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common.Must2(pro.Write([]byte("PROXY TCP6 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n")))
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}
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case 2:
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common.Must2(pro.Write([]byte("\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A"))) // signature
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if ipType == 0 {
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common.Must2(pro.Write([]byte("\x20\x00\x00\x00"))) // v2 + LOCAL + UNSPEC + UNSPEC + 0 bytes
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break
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}
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if ipType == 4 {
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common.Must2(pro.Write([]byte("\x21\x11\x00\x0C"))) // v2 + PROXY + AF_INET + STREAM + 12 bytes
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common.Must2(pro.Write(net.ParseIP(remoteAddr).To4()))
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common.Must2(pro.Write(net.ParseIP(localAddr).To4()))
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} else {
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common.Must2(pro.Write([]byte("\x21\x21\x00\x24"))) // v2 + PROXY + AF_INET6 + STREAM + 36 bytes
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common.Must2(pro.Write(net.ParseIP(remoteAddr).To16()))
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common.Must2(pro.Write(net.ParseIP(localAddr).To16()))
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}
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p1, _ := strconv.ParseUint(remotePort, 10, 16)
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p2, _ := strconv.ParseUint(localPort, 10, 16)
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common.Must2(pro.Write([]byte{byte(p1 >> 8), byte(p1), byte(p2 >> 8), byte(p2)}))
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}
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if err := serverWriter.WriteMultiBuffer(buf.MultiBuffer{pro}); err != nil {
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return errors.New("failed to set PROXY protocol v", fb.Xver).Base(err).AtWarning()
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}
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}
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if err := buf.Copy(reader, serverWriter, buf.UpdateActivity(timer)); err != nil {
|
|
return errors.New("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 errors.New("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.Must(common.Interrupt(serverReader))
|
|
common.Must(common.Interrupt(serverWriter))
|
|
return errors.New("fallback ends").Base(err).AtInfo()
|
|
}
|
|
|
|
return nil
|
|
}
|