mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-12-21 09:36:34 -05:00
433 lines
13 KiB
Go
433 lines
13 KiB
Go
// +build !confonly
|
|
|
|
package trojan
|
|
|
|
import (
|
|
"context"
|
|
"crypto/tls"
|
|
"io"
|
|
"strconv"
|
|
"time"
|
|
|
|
core "github.com/v2fly/v2ray-core/v4"
|
|
"github.com/v2fly/v2ray-core/v4/common"
|
|
"github.com/v2fly/v2ray-core/v4/common/buf"
|
|
"github.com/v2fly/v2ray-core/v4/common/errors"
|
|
"github.com/v2fly/v2ray-core/v4/common/log"
|
|
"github.com/v2fly/v2ray-core/v4/common/net"
|
|
"github.com/v2fly/v2ray-core/v4/common/protocol"
|
|
udp_proto "github.com/v2fly/v2ray-core/v4/common/protocol/udp"
|
|
"github.com/v2fly/v2ray-core/v4/common/retry"
|
|
"github.com/v2fly/v2ray-core/v4/common/session"
|
|
"github.com/v2fly/v2ray-core/v4/common/signal"
|
|
"github.com/v2fly/v2ray-core/v4/common/task"
|
|
"github.com/v2fly/v2ray-core/v4/features/policy"
|
|
"github.com/v2fly/v2ray-core/v4/features/routing"
|
|
"github.com/v2fly/v2ray-core/v4/transport/internet"
|
|
"github.com/v2fly/v2ray-core/v4/transport/internet/udp"
|
|
)
|
|
|
|
func init() {
|
|
common.Must(common.RegisterConfig((*ServerConfig)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
|
|
return NewServer(ctx, config.(*ServerConfig))
|
|
}))
|
|
}
|
|
|
|
// Server is an inbound connection handler that handles messages in trojan protocol.
|
|
type Server struct {
|
|
policyManager policy.Manager
|
|
validator *Validator
|
|
fallbacks map[string]map[string]*Fallback // or nil
|
|
}
|
|
|
|
// NewServer creates a new trojan inbound handler.
|
|
func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
|
|
validator := new(Validator)
|
|
for _, user := range config.Users {
|
|
u, err := user.ToMemoryUser()
|
|
if err != nil {
|
|
return nil, newError("failed to get trojan user").Base(err).AtError()
|
|
}
|
|
|
|
if err := validator.Add(u); err != nil {
|
|
return nil, newError("failed to add user").Base(err).AtError()
|
|
}
|
|
}
|
|
|
|
v := core.MustFromContext(ctx)
|
|
server := &Server{
|
|
policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
|
|
validator: validator,
|
|
}
|
|
|
|
if config.Fallbacks != nil {
|
|
server.fallbacks = make(map[string]map[string]*Fallback)
|
|
for _, fb := range config.Fallbacks {
|
|
if server.fallbacks[fb.Alpn] == nil {
|
|
server.fallbacks[fb.Alpn] = make(map[string]*Fallback)
|
|
}
|
|
server.fallbacks[fb.Alpn][fb.Path] = fb
|
|
}
|
|
if server.fallbacks[""] != nil {
|
|
for alpn, pfb := range server.fallbacks {
|
|
if alpn != "" { // && alpn != "h2" {
|
|
for path, fb := range server.fallbacks[""] {
|
|
if pfb[path] == nil {
|
|
pfb[path] = fb
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return server, nil
|
|
}
|
|
|
|
// AddUser implements proxy.UserManager.AddUser().
|
|
func (s *Server) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
|
|
return s.validator.Add(u)
|
|
}
|
|
|
|
// RemoveUser implements proxy.UserManager.RemoveUser().
|
|
func (s *Server) RemoveUser(ctx context.Context, e string) error {
|
|
return s.validator.Del(e)
|
|
}
|
|
|
|
// Network implements proxy.Inbound.Network().
|
|
func (s *Server) Network() []net.Network {
|
|
return []net.Network{net.Network_TCP, net.Network_UNIX}
|
|
}
|
|
|
|
// Process implements proxy.Inbound.Process().
|
|
func (s *Server) Process(ctx context.Context, network net.Network, conn internet.Connection, dispatcher routing.Dispatcher) error {
|
|
sid := session.ExportIDToError(ctx)
|
|
|
|
iConn := conn
|
|
if statConn, ok := iConn.(*internet.StatCouterConnection); ok {
|
|
iConn = statConn.Connection
|
|
}
|
|
|
|
sessionPolicy := s.policyManager.ForLevel(0)
|
|
if err := conn.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil {
|
|
return newError("unable to set read deadline").Base(err).AtWarning()
|
|
}
|
|
|
|
first := buf.New()
|
|
defer first.Release()
|
|
|
|
firstLen, err := first.ReadFrom(conn)
|
|
if err != nil {
|
|
return newError("failed to read first request").Base(err)
|
|
}
|
|
newError("firstLen = ", firstLen).AtInfo().WriteToLog(sid)
|
|
|
|
bufferedReader := &buf.BufferedReader{
|
|
Reader: buf.NewReader(conn),
|
|
Buffer: buf.MultiBuffer{first},
|
|
}
|
|
|
|
var user *protocol.MemoryUser
|
|
|
|
apfb := s.fallbacks
|
|
isfb := apfb != nil
|
|
|
|
shouldFallback := false
|
|
if firstLen < 58 || first.Byte(56) != '\r' {
|
|
// invalid protocol
|
|
err = newError("not trojan protocol")
|
|
log.Record(&log.AccessMessage{
|
|
From: conn.RemoteAddr(),
|
|
To: "",
|
|
Status: log.AccessRejected,
|
|
Reason: err,
|
|
})
|
|
|
|
shouldFallback = true
|
|
} else {
|
|
user = s.validator.Get(hexString(first.BytesTo(56)))
|
|
if user == nil {
|
|
// invalid user, let's fallback
|
|
err = newError("not a valid user")
|
|
log.Record(&log.AccessMessage{
|
|
From: conn.RemoteAddr(),
|
|
To: "",
|
|
Status: log.AccessRejected,
|
|
Reason: err,
|
|
})
|
|
|
|
shouldFallback = true
|
|
}
|
|
}
|
|
|
|
if isfb && shouldFallback {
|
|
return s.fallback(ctx, sid, err, sessionPolicy, conn, iConn, apfb, first, firstLen, bufferedReader)
|
|
} else if shouldFallback {
|
|
return newError("invalid protocol or invalid user")
|
|
}
|
|
|
|
clientReader := &ConnReader{Reader: bufferedReader}
|
|
if err := clientReader.ParseHeader(); err != nil {
|
|
log.Record(&log.AccessMessage{
|
|
From: conn.RemoteAddr(),
|
|
To: "",
|
|
Status: log.AccessRejected,
|
|
Reason: err,
|
|
})
|
|
return newError("failed to create request from: ", conn.RemoteAddr()).Base(err)
|
|
}
|
|
|
|
destination := clientReader.Target
|
|
if err := conn.SetReadDeadline(time.Time{}); err != nil {
|
|
return newError("unable to set read deadline").Base(err).AtWarning()
|
|
}
|
|
|
|
inbound := session.InboundFromContext(ctx)
|
|
if inbound == nil {
|
|
panic("no inbound metadata")
|
|
}
|
|
inbound.User = user
|
|
sessionPolicy = s.policyManager.ForLevel(user.Level)
|
|
|
|
if destination.Network == net.Network_UDP { // handle udp request
|
|
return s.handleUDPPayload(ctx, &PacketReader{Reader: clientReader}, &PacketWriter{Writer: conn}, dispatcher)
|
|
}
|
|
|
|
ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
|
|
From: conn.RemoteAddr(),
|
|
To: destination,
|
|
Status: log.AccessAccepted,
|
|
Reason: "",
|
|
Email: user.Email,
|
|
})
|
|
|
|
newError("received request for ", destination).WriteToLog(sid)
|
|
return s.handleConnection(ctx, sessionPolicy, destination, clientReader, buf.NewWriter(conn), dispatcher)
|
|
}
|
|
|
|
func (s *Server) handleUDPPayload(ctx context.Context, clientReader *PacketReader, clientWriter *PacketWriter, dispatcher routing.Dispatcher) error {
|
|
udpServer := udp.NewDispatcher(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
|
|
if err := clientWriter.WriteMultiBufferWithMetadata(buf.MultiBuffer{packet.Payload}, packet.Source); err != nil {
|
|
newError("failed to write response").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
})
|
|
|
|
inbound := session.InboundFromContext(ctx)
|
|
user := inbound.User
|
|
|
|
for {
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil
|
|
default:
|
|
p, err := clientReader.ReadMultiBufferWithMetadata()
|
|
if err != nil {
|
|
if errors.Cause(err) != io.EOF {
|
|
return newError("unexpected EOF").Base(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
|
|
From: inbound.Source,
|
|
To: p.Target,
|
|
Status: log.AccessAccepted,
|
|
Reason: "",
|
|
Email: user.Email,
|
|
})
|
|
newError("tunnelling request to ", p.Target).WriteToLog(session.ExportIDToError(ctx))
|
|
|
|
for _, b := range p.Buffer {
|
|
udpServer.Dispatch(ctx, p.Target, b)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (s *Server) handleConnection(ctx context.Context, sessionPolicy policy.Session,
|
|
destination net.Destination,
|
|
clientReader buf.Reader,
|
|
clientWriter buf.Writer, dispatcher routing.Dispatcher) error {
|
|
ctx, cancel := context.WithCancel(ctx)
|
|
timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
|
|
ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
|
|
|
|
link, err := dispatcher.Dispatch(ctx, destination)
|
|
if err != nil {
|
|
return newError("failed to dispatch request to ", destination).Base(err)
|
|
}
|
|
|
|
requestDone := func() error {
|
|
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
|
|
|
|
if err := buf.Copy(clientReader, link.Writer, buf.UpdateActivity(timer)); err != nil {
|
|
return newError("failed to transfer request").Base(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
responseDone := func() error {
|
|
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
|
|
|
|
if err := buf.Copy(link.Reader, clientWriter, buf.UpdateActivity(timer)); err != nil {
|
|
return newError("failed to write response").Base(err)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var requestDonePost = task.OnSuccess(requestDone, task.Close(link.Writer))
|
|
if err := task.Run(ctx, requestDonePost, responseDone); err != nil {
|
|
common.Must(common.Interrupt(link.Reader))
|
|
common.Must(common.Interrupt(link.Writer))
|
|
return newError("connection ends").Base(err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (s *Server) fallback(ctx context.Context, sid errors.ExportOption, err error, sessionPolicy policy.Session, connection internet.Connection, iConn internet.Connection, apfb map[string]map[string]*Fallback, first *buf.Buffer, firstLen int64, reader buf.Reader) error {
|
|
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)
|
|
|
|
alpn := ""
|
|
if len(apfb) > 1 || apfb[""] == nil {
|
|
if tlsConn, ok := iConn.(*tls.Conn); ok {
|
|
alpn = tlsConn.ConnectionState().NegotiatedProtocol
|
|
newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid)
|
|
}
|
|
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 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 == ' ' {
|
|
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 {
|
|
remoteAddr, remotePort, err := net.SplitHostPort(connection.RemoteAddr().String())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
localAddr, localPort, err := net.SplitHostPort(connection.LocalAddr().String())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ipv4 := true
|
|
for i := 0; i < len(remoteAddr); i++ {
|
|
if remoteAddr[i] == ':' {
|
|
ipv4 = false
|
|
break
|
|
}
|
|
}
|
|
pro := buf.New()
|
|
defer pro.Release()
|
|
switch fb.Xver {
|
|
case 1:
|
|
if ipv4 {
|
|
common.Must2(pro.Write([]byte("PROXY TCP4 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n")))
|
|
} else {
|
|
common.Must2(pro.Write([]byte("PROXY TCP6 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n")))
|
|
}
|
|
case 2:
|
|
common.Must2(pro.Write([]byte("\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A\x21"))) // signature + v2 + PROXY
|
|
if ipv4 {
|
|
common.Must2(pro.Write([]byte("\x11\x00\x0C"))) // AF_INET + STREAM + 12 bytes
|
|
common.Must2(pro.Write(net.ParseIP(remoteAddr).To4()))
|
|
common.Must2(pro.Write(net.ParseIP(localAddr).To4()))
|
|
} else {
|
|
common.Must2(pro.Write([]byte("\x21\x00\x24"))) // AF_INET6 + STREAM + 36 bytes
|
|
common.Must2(pro.Write(net.ParseIP(remoteAddr).To16()))
|
|
common.Must2(pro.Write(net.ParseIP(localAddr).To16()))
|
|
}
|
|
p1, _ := strconv.ParseUint(remotePort, 10, 16)
|
|
p2, _ := strconv.ParseUint(localPort, 10, 16)
|
|
common.Must2(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.Must(common.Interrupt(serverReader))
|
|
common.Must(common.Interrupt(serverWriter))
|
|
return newError("fallback ends").Base(err).AtInfo()
|
|
}
|
|
|
|
return nil
|
|
}
|