mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-26 22:59:20 +02:00
524 lines
16 KiB
Go
524 lines
16 KiB
Go
package encoding
|
|
|
|
//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
|
|
|
|
import (
|
|
"bytes"
|
|
"context"
|
|
"crypto/rand"
|
|
"fmt"
|
|
"io"
|
|
"math/big"
|
|
"runtime"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/xtls/xray-core/common/buf"
|
|
"github.com/xtls/xray-core/common/errors"
|
|
"github.com/xtls/xray-core/common/net"
|
|
"github.com/xtls/xray-core/common/protocol"
|
|
"github.com/xtls/xray-core/common/session"
|
|
"github.com/xtls/xray-core/common/signal"
|
|
"github.com/xtls/xray-core/features/stats"
|
|
"github.com/xtls/xray-core/proxy/vless"
|
|
"github.com/xtls/xray-core/transport/internet/stat"
|
|
"github.com/xtls/xray-core/transport/internet/tls"
|
|
"github.com/xtls/xray-core/transport/internet/xtls"
|
|
)
|
|
|
|
const (
|
|
Version = byte(0)
|
|
)
|
|
|
|
var tls13SupportedVersions = []byte{0x00, 0x2b, 0x00, 0x02, 0x03, 0x04}
|
|
var tlsClientHandShakeStart = []byte{0x16, 0x03}
|
|
var tlsServerHandShakeStart = []byte{0x16, 0x03, 0x03}
|
|
var tlsApplicationDataStart = []byte{0x17, 0x03, 0x03}
|
|
|
|
var addrParser = protocol.NewAddressParser(
|
|
protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv4), net.AddressFamilyIPv4),
|
|
protocol.AddressFamilyByte(byte(protocol.AddressTypeDomain), net.AddressFamilyDomain),
|
|
protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv6), net.AddressFamilyIPv6),
|
|
protocol.PortThenAddress(),
|
|
)
|
|
|
|
// EncodeRequestHeader writes encoded request header into the given writer.
|
|
func EncodeRequestHeader(writer io.Writer, request *protocol.RequestHeader, requestAddons *Addons) error {
|
|
buffer := buf.StackNew()
|
|
defer buffer.Release()
|
|
|
|
if err := buffer.WriteByte(request.Version); err != nil {
|
|
return newError("failed to write request version").Base(err)
|
|
}
|
|
|
|
if _, err := buffer.Write(request.User.Account.(*vless.MemoryAccount).ID.Bytes()); err != nil {
|
|
return newError("failed to write request user id").Base(err)
|
|
}
|
|
|
|
if err := EncodeHeaderAddons(&buffer, requestAddons); err != nil {
|
|
return newError("failed to encode request header addons").Base(err)
|
|
}
|
|
|
|
if err := buffer.WriteByte(byte(request.Command)); err != nil {
|
|
return newError("failed to write request command").Base(err)
|
|
}
|
|
|
|
if request.Command != protocol.RequestCommandMux {
|
|
if err := addrParser.WriteAddressPort(&buffer, request.Address, request.Port); err != nil {
|
|
return newError("failed to write request address and port").Base(err)
|
|
}
|
|
}
|
|
|
|
if _, err := writer.Write(buffer.Bytes()); err != nil {
|
|
return newError("failed to write request header").Base(err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// DecodeRequestHeader decodes and returns (if successful) a RequestHeader from an input stream.
|
|
func DecodeRequestHeader(isfb bool, first *buf.Buffer, reader io.Reader, validator *vless.Validator) (*protocol.RequestHeader, *Addons, bool, error) {
|
|
buffer := buf.StackNew()
|
|
defer buffer.Release()
|
|
|
|
request := new(protocol.RequestHeader)
|
|
|
|
if isfb {
|
|
request.Version = first.Byte(0)
|
|
} else {
|
|
if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
|
|
return nil, nil, false, newError("failed to read request version").Base(err)
|
|
}
|
|
request.Version = buffer.Byte(0)
|
|
}
|
|
|
|
switch request.Version {
|
|
case 0:
|
|
|
|
var id [16]byte
|
|
|
|
if isfb {
|
|
copy(id[:], first.BytesRange(1, 17))
|
|
} else {
|
|
buffer.Clear()
|
|
if _, err := buffer.ReadFullFrom(reader, 16); err != nil {
|
|
return nil, nil, false, newError("failed to read request user id").Base(err)
|
|
}
|
|
copy(id[:], buffer.Bytes())
|
|
}
|
|
|
|
if request.User = validator.Get(id); request.User == nil {
|
|
return nil, nil, isfb, newError("invalid request user id")
|
|
}
|
|
|
|
if isfb {
|
|
first.Advance(17)
|
|
}
|
|
|
|
requestAddons, err := DecodeHeaderAddons(&buffer, reader)
|
|
if err != nil {
|
|
return nil, nil, false, newError("failed to decode request header addons").Base(err)
|
|
}
|
|
|
|
buffer.Clear()
|
|
if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
|
|
return nil, nil, false, newError("failed to read request command").Base(err)
|
|
}
|
|
|
|
request.Command = protocol.RequestCommand(buffer.Byte(0))
|
|
switch request.Command {
|
|
case protocol.RequestCommandMux:
|
|
request.Address = net.DomainAddress("v1.mux.cool")
|
|
request.Port = 0
|
|
case protocol.RequestCommandTCP, protocol.RequestCommandUDP:
|
|
if addr, port, err := addrParser.ReadAddressPort(&buffer, reader); err == nil {
|
|
request.Address = addr
|
|
request.Port = port
|
|
}
|
|
}
|
|
if request.Address == nil {
|
|
return nil, nil, false, newError("invalid request address")
|
|
}
|
|
return request, requestAddons, false, nil
|
|
default:
|
|
return nil, nil, isfb, newError("invalid request version")
|
|
}
|
|
}
|
|
|
|
// EncodeResponseHeader writes encoded response header into the given writer.
|
|
func EncodeResponseHeader(writer io.Writer, request *protocol.RequestHeader, responseAddons *Addons) error {
|
|
buffer := buf.StackNew()
|
|
defer buffer.Release()
|
|
|
|
if err := buffer.WriteByte(request.Version); err != nil {
|
|
return newError("failed to write response version").Base(err)
|
|
}
|
|
|
|
if err := EncodeHeaderAddons(&buffer, responseAddons); err != nil {
|
|
return newError("failed to encode response header addons").Base(err)
|
|
}
|
|
|
|
if _, err := writer.Write(buffer.Bytes()); err != nil {
|
|
return newError("failed to write response header").Base(err)
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// DecodeResponseHeader decodes and returns (if successful) a ResponseHeader from an input stream.
|
|
func DecodeResponseHeader(reader io.Reader, request *protocol.RequestHeader) (*Addons, error) {
|
|
buffer := buf.StackNew()
|
|
defer buffer.Release()
|
|
|
|
if _, err := buffer.ReadFullFrom(reader, 1); err != nil {
|
|
return nil, newError("failed to read response version").Base(err)
|
|
}
|
|
|
|
if buffer.Byte(0) != request.Version {
|
|
return nil, newError("unexpected response version. Expecting ", int(request.Version), " but actually ", int(buffer.Byte(0)))
|
|
}
|
|
|
|
responseAddons, err := DecodeHeaderAddons(&buffer, reader)
|
|
if err != nil {
|
|
return nil, newError("failed to decode response header addons").Base(err)
|
|
}
|
|
|
|
return responseAddons, nil
|
|
}
|
|
|
|
func ReadV(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn *xtls.Conn, rawConn syscall.RawConn, counter stats.Counter, ctx context.Context) error {
|
|
err := func() error {
|
|
var ct stats.Counter
|
|
for {
|
|
if conn.DirectIn {
|
|
conn.DirectIn = false
|
|
if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Conn != nil {
|
|
iConn := inbound.Conn
|
|
statConn, ok := iConn.(*stat.CounterConnection)
|
|
if ok {
|
|
iConn = statConn.Connection
|
|
}
|
|
if xc, ok := iConn.(*xtls.Conn); ok {
|
|
iConn = xc.NetConn()
|
|
}
|
|
if tc, ok := iConn.(*net.TCPConn); ok {
|
|
if conn.SHOW {
|
|
fmt.Println(conn.MARK, "Splice")
|
|
}
|
|
runtime.Gosched() // necessary
|
|
w, err := tc.ReadFrom(conn.NetConn())
|
|
if counter != nil {
|
|
counter.Add(w)
|
|
}
|
|
if statConn != nil && statConn.WriteCounter != nil {
|
|
statConn.WriteCounter.Add(w)
|
|
}
|
|
return err
|
|
} else {
|
|
panic("XTLS Splice: not TCP inbound")
|
|
}
|
|
}
|
|
reader = buf.NewReadVReader(conn.NetConn(), rawConn, nil)
|
|
ct = counter
|
|
if conn.SHOW {
|
|
fmt.Println(conn.MARK, "ReadV")
|
|
}
|
|
}
|
|
buffer, err := reader.ReadMultiBuffer()
|
|
if !buffer.IsEmpty() {
|
|
if ct != nil {
|
|
ct.Add(int64(buffer.Len()))
|
|
}
|
|
timer.Update()
|
|
if werr := writer.WriteMultiBuffer(buffer); werr != nil {
|
|
return werr
|
|
}
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}()
|
|
if err != nil && errors.Cause(err) != io.EOF {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// XtlsRead filter and read xtls protocol
|
|
func XtlsRead(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, rawConn syscall.RawConn, counter stats.Counter, ctx context.Context, userUUID []byte, numberOfPacketToFilter *int, isTLS13 *bool, isTLS12 *bool, isTLS *bool) error {
|
|
err := func() error {
|
|
var ct stats.Counter
|
|
filterUUID := true
|
|
shouldSwitchToDirectCopy := false
|
|
var remainingContent int32 = -1
|
|
var remainingPadding int32 = -1
|
|
currentCommand := 0
|
|
for {
|
|
if shouldSwitchToDirectCopy {
|
|
shouldSwitchToDirectCopy = false
|
|
if runtime.GOOS == "linux" || runtime.GOOS == "android" {
|
|
if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Conn != nil {
|
|
iConn := inbound.Conn
|
|
statConn, ok := iConn.(*stat.CounterConnection)
|
|
if ok {
|
|
iConn = statConn.Connection
|
|
}
|
|
if xc, ok := iConn.(*tls.Conn); ok {
|
|
iConn = xc.NetConn()
|
|
}
|
|
if tc, ok := iConn.(*net.TCPConn); ok {
|
|
newError("XtlsRead splice").WriteToLog(session.ExportIDToError(ctx))
|
|
runtime.Gosched() // necessary
|
|
w, err := tc.ReadFrom(conn)
|
|
if counter != nil {
|
|
counter.Add(w)
|
|
}
|
|
if statConn != nil && statConn.WriteCounter != nil {
|
|
statConn.WriteCounter.Add(w)
|
|
}
|
|
return err
|
|
} else {
|
|
panic("XTLS Splice: not TCP inbound")
|
|
}
|
|
} else {
|
|
// panic("XTLS Splice: nil inbound or nil inbound.Conn")
|
|
}
|
|
}
|
|
reader = buf.NewReadVReader(conn, rawConn, nil)
|
|
ct = counter
|
|
newError("XtlsRead readV").WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
buffer, err := reader.ReadMultiBuffer()
|
|
if !buffer.IsEmpty() {
|
|
if filterUUID && (*isTLS || *numberOfPacketToFilter > 0) {
|
|
buffer = XtlsUnpadding(ctx, buffer, userUUID, &remainingContent, &remainingPadding, ¤tCommand)
|
|
if remainingContent == 0 && remainingPadding == 0 {
|
|
if currentCommand == 1 {
|
|
filterUUID = false
|
|
} else if currentCommand == 2 {
|
|
filterUUID = false
|
|
shouldSwitchToDirectCopy = true
|
|
} else if currentCommand != 0 {
|
|
newError("XtlsRead unknown command ", currentCommand, buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
}
|
|
}
|
|
if *numberOfPacketToFilter > 0 {
|
|
XtlsFilterTls13(buffer, numberOfPacketToFilter, isTLS13, isTLS12, isTLS, ctx)
|
|
}
|
|
if ct != nil {
|
|
ct.Add(int64(buffer.Len()))
|
|
}
|
|
timer.Update()
|
|
if werr := writer.WriteMultiBuffer(buffer); werr != nil {
|
|
return werr
|
|
}
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}()
|
|
if err != nil && errors.Cause(err) != io.EOF {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// XtlsWrite filter and write xtls protocol
|
|
func XtlsWrite(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, counter stats.Counter, ctx context.Context, userUUID *[]byte, numberOfPacketToFilter *int, isTLS13 *bool, isTLS12 *bool, isTLS *bool) error {
|
|
err := func() error {
|
|
var ct stats.Counter
|
|
filterTlsApplicationData := true
|
|
shouldSwitchToDirectCopy := false
|
|
for {
|
|
buffer, err := reader.ReadMultiBuffer()
|
|
if !buffer.IsEmpty() {
|
|
if *numberOfPacketToFilter > 0 {
|
|
XtlsFilterTls13(buffer, numberOfPacketToFilter, isTLS13, isTLS12, isTLS, ctx)
|
|
}
|
|
if filterTlsApplicationData && *isTLS {
|
|
var xtlsSpecIndex int
|
|
for i, b := range buffer {
|
|
if b.Len() >= 6 && bytes.Equal(tlsApplicationDataStart, b.BytesTo(3)) {
|
|
var command byte = 0x01
|
|
if *isTLS13 {
|
|
shouldSwitchToDirectCopy = true
|
|
xtlsSpecIndex = i
|
|
command = 0x02
|
|
}
|
|
filterTlsApplicationData = false
|
|
buffer[i] = XtlsPadding(b, command, userUUID, ctx)
|
|
break
|
|
} else if !*isTLS12 && !*isTLS13 && *numberOfPacketToFilter <= 0 {
|
|
//maybe tls 1.1 or 1.0
|
|
filterTlsApplicationData = false
|
|
buffer[i] = XtlsPadding(b, 0x01, userUUID, ctx)
|
|
break
|
|
}
|
|
buffer[i] = XtlsPadding(b, 0x00, userUUID, ctx)
|
|
}
|
|
if shouldSwitchToDirectCopy {
|
|
encryptBuffer, directBuffer := buf.SplitMulti(buffer, xtlsSpecIndex+1)
|
|
length := encryptBuffer.Len()
|
|
if !encryptBuffer.IsEmpty() {
|
|
timer.Update()
|
|
if werr := writer.WriteMultiBuffer(encryptBuffer); werr != nil {
|
|
return werr
|
|
}
|
|
}
|
|
buffer = directBuffer
|
|
writer = buf.NewWriter(conn)
|
|
ct = counter
|
|
newError("XtlsWrite writeV ", xtlsSpecIndex, " ", length, " ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
|
time.Sleep(5 * time.Millisecond) // for some device, the first xtls direct packet fails without this delay
|
|
}
|
|
}
|
|
if !buffer.IsEmpty() {
|
|
if ct != nil {
|
|
ct.Add(int64(buffer.Len()))
|
|
}
|
|
timer.Update()
|
|
if werr := writer.WriteMultiBuffer(buffer); werr != nil {
|
|
return werr
|
|
}
|
|
}
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}()
|
|
if err != nil && errors.Cause(err) != io.EOF {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// XtlsFilterTls13 filter and recognize tls 1.3
|
|
func XtlsFilterTls13(buffer buf.MultiBuffer, numberOfPacketToFilter *int, isTLS13 *bool, isTLS12 *bool, isTLS *bool, ctx context.Context) {
|
|
for _, b := range buffer {
|
|
*numberOfPacketToFilter--
|
|
if b.Len() >= 6 {
|
|
startsBytes := b.BytesTo(6)
|
|
if bytes.Equal(tlsServerHandShakeStart, startsBytes[:3]) && startsBytes[5] == 0x02 {
|
|
total := (int(startsBytes[3])<<8 | int(startsBytes[4])) + 5
|
|
if b.Len() >= int32(total) {
|
|
if bytes.Contains(b.BytesTo(int32(total)), tls13SupportedVersions) {
|
|
*isTLS13 = true
|
|
*isTLS = true
|
|
newError("XtlsFilterTls13 found tls 1.3! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
|
} else {
|
|
*isTLS12 = true
|
|
*isTLS = true
|
|
newError("XtlsFilterTls13 found tls 1.2! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
*numberOfPacketToFilter = 0
|
|
return
|
|
}
|
|
} else if bytes.Equal(tlsClientHandShakeStart, startsBytes[:2]) && startsBytes[5] == 0x01 {
|
|
*isTLS = true
|
|
newError("XtlsFilterTls13 found tls client hello! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
}
|
|
if *numberOfPacketToFilter <= 0 {
|
|
newError("XtlsFilterTls13 stop filtering", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
}
|
|
}
|
|
|
|
// XtlsPadding add padding to eliminate length siganature during tls handshake
|
|
func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, ctx context.Context) *buf.Buffer {
|
|
var length int32 = 0
|
|
if b.Len() < 900 {
|
|
l, err := rand.Int(rand.Reader, big.NewInt(500))
|
|
if err != nil {
|
|
newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
length = int32(l.Int64()) + 900 - b.Len()
|
|
}
|
|
newbuffer := buf.New()
|
|
if userUUID != nil {
|
|
newbuffer.Write(*userUUID)
|
|
*userUUID = nil
|
|
}
|
|
newbuffer.Write([]byte{command, byte(b.Len() >> 8), byte(b.Len()), byte(length >> 8), byte(length)})
|
|
newbuffer.Write(b.Bytes())
|
|
newbuffer.Extend(length)
|
|
newError("XtlsPadding ", b.Len(), " ", length, " ", command).WriteToLog(session.ExportIDToError(ctx))
|
|
b.Release()
|
|
b = nil
|
|
return newbuffer
|
|
}
|
|
|
|
// XtlsUnpadding remove padding and parse command
|
|
func XtlsUnpadding(ctx context.Context, buffer buf.MultiBuffer, userUUID []byte, remainingContent *int32, remainingPadding *int32, currentCommand *int) buf.MultiBuffer {
|
|
posindex := 0
|
|
var posByte int32 = 0
|
|
if *remainingContent == -1 && *remainingPadding == -1 {
|
|
for i, b := range buffer {
|
|
if b.Len() >= 21 && bytes.Equal(userUUID, b.BytesTo(16)) {
|
|
posindex = i
|
|
posByte = 16
|
|
*remainingContent = 0
|
|
*remainingPadding = 0
|
|
break
|
|
}
|
|
}
|
|
}
|
|
if *remainingContent == -1 && *remainingPadding == -1 {
|
|
return buffer
|
|
}
|
|
mb2 := make(buf.MultiBuffer, 0, len(buffer))
|
|
for i := 0; i < posindex; i++ {
|
|
newbuffer := buf.New()
|
|
newbuffer.Write(buffer[i].Bytes())
|
|
mb2 = append(mb2, newbuffer)
|
|
}
|
|
for i := posindex; i < len(buffer); i++ {
|
|
b := buffer[i]
|
|
for posByte < b.Len() {
|
|
if *remainingContent <= 0 && *remainingPadding <= 0 {
|
|
if *currentCommand == 1 {
|
|
len := b.Len() - posByte
|
|
newbuffer := buf.New()
|
|
newbuffer.Write(b.BytesRange(posByte, posByte+len))
|
|
mb2 = append(mb2, newbuffer)
|
|
posByte += len
|
|
} else {
|
|
paddingInfo := b.BytesRange(posByte, posByte+5)
|
|
*currentCommand = int(paddingInfo[0])
|
|
*remainingContent = int32(paddingInfo[1])<<8 | int32(paddingInfo[2])
|
|
*remainingPadding = int32(paddingInfo[3])<<8 | int32(paddingInfo[4])
|
|
newError("Xtls Unpadding new block", i, " ", posByte, " content ", *remainingContent, " padding ", *remainingPadding, " ", paddingInfo[0]).WriteToLog(session.ExportIDToError(ctx))
|
|
posByte += 5
|
|
}
|
|
} else if *remainingContent > 0 {
|
|
len := *remainingContent
|
|
if b.Len() < posByte+*remainingContent {
|
|
len = b.Len() - posByte
|
|
}
|
|
newbuffer := buf.New()
|
|
newbuffer.Write(b.BytesRange(posByte, posByte+len))
|
|
mb2 = append(mb2, newbuffer)
|
|
*remainingContent -= len
|
|
posByte += len
|
|
} else { // remainingPadding > 0
|
|
len := *remainingPadding
|
|
if b.Len() < posByte+*remainingPadding {
|
|
len = b.Len() - posByte
|
|
}
|
|
*remainingPadding -= len
|
|
posByte += len
|
|
}
|
|
if posByte == b.Len() {
|
|
posByte = 0
|
|
break
|
|
}
|
|
}
|
|
}
|
|
buf.ReleaseMulti(buffer)
|
|
return mb2
|
|
}
|