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feat: Support VLESS XTLS Vision (#406)

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This commit is contained in:
gVisor bot 2023-02-25 13:12:19 +08:00
parent 32978a6459
commit aaf1ce67d1
7 changed files with 477 additions and 43 deletions
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8
adapter/outbound/vless.go
View file

@ -171,7 +171,7 @@ func (v *Vless) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
func (v *Vless) streamTLSOrXTLSConn(conn net.Conn, isH2 bool) (net.Conn, error) {
host, _, _ := net.SplitHostPort(v.addr)
if v.isXTLSEnabled() && !isH2 {
if v.isLegacyXTLSEnabled() && !isH2 {
xtlsOpts := vless.XTLSConfig{
Host: host,
SkipCertVerify: v.option.SkipCertVerify,
@ -206,8 +206,8 @@ func (v *Vless) streamTLSOrXTLSConn(conn net.Conn, isH2 bool) (net.Conn, error)
return conn, nil
}
func (v *Vless) isXTLSEnabled() bool {
return v.client.Addons != nil
func (v *Vless) isLegacyXTLSEnabled() bool {
return v.client.Addons != nil && v.client.Addons.Flow != vless.XRV
}
// DialContext implements C.ProxyAdapter
@ -479,7 +479,7 @@ func NewVless(option VlessOption) (*Vless, error) {
if option.Network != "ws" && len(option.Flow) >= 16 {
option.Flow = option.Flow[:16]
switch option.Flow {
case vless.XRO, vless.XRD, vless.XRS:
case vless.XRO, vless.XRD, vless.XRS, vless.XRV:
addons = &vless.Addons{
Flow: option.Flow,
}

6
common/buf/sing.go
View file

@ -5,9 +5,15 @@ import (
"github.com/sagernet/sing/common/buf"
)
const BufferSize = buf.BufferSize
type Buffer = buf.Buffer
var New = buf.New
var StackNew = buf.StackNew
var StackNewSize = buf.StackNewSize
var With = buf.With
var KeepAlive = common.KeepAlive
//go:norace

322
transport/vless/conn.go
View file

@ -1,23 +1,33 @@
package vless
import (
"bytes"
"crypto/subtle"
gotls "crypto/tls"
"encoding/binary"
"errors"
"fmt"
"io"
"net"
"reflect"
"sync"
"unsafe"
"github.com/Dreamacro/clash/common/buf"
N "github.com/Dreamacro/clash/common/net"
tlsC "github.com/Dreamacro/clash/component/tls"
"github.com/Dreamacro/clash/log"
"github.com/gofrs/uuid"
utls "github.com/sagernet/utls"
xtls "github.com/xtls/go"
"google.golang.org/protobuf/proto"
)
type Conn struct {
N.ExtendedConn
N.ExtendedWriter
N.ExtendedReader
net.Conn
dst *DstAddr
id *uuid.UUID
addons *Addons
@ -26,30 +36,143 @@ type Conn struct {
handshake chan struct{}
handshakeMutex sync.Mutex
err error
tlsConn net.Conn
input *bytes.Reader
rawInput *bytes.Buffer
packetsToFilter int
isTLS bool
isTLS12orAbove bool
enableXTLS bool
cipher uint16
remainingServerHello uint16
readRemainingContent int
readRemainingPadding int
readProcess bool
readFilterUUID bool
readLastCommand byte
writeFilterApplicationData bool
writeDirect bool
}
func (vc *Conn) Read(b []byte) (int, error) {
if vc.received {
return vc.ExtendedConn.Read(b)
if vc.readProcess {
buffer := buf.With(b)
err := vc.ReadBuffer(buffer)
return buffer.Len(), err
}
return vc.ExtendedReader.Read(b)
}
if err := vc.recvResponse(); err != nil {
return 0, err
}
vc.received = true
return vc.ExtendedConn.Read(b)
return vc.Read(b)
}
func (vc *Conn) ReadBuffer(buffer *buf.Buffer) error {
if vc.received {
return vc.ExtendedConn.ReadBuffer(buffer)
toRead := buffer.FreeBytes()
if vc.readRemainingContent > 0 {
if vc.readRemainingContent < buffer.FreeLen() {
toRead = toRead[:vc.readRemainingContent]
}
n, err := vc.ExtendedReader.Read(toRead)
buffer.Truncate(n)
vc.readRemainingContent -= n
vc.FilterTLS(toRead)
return err
}
if vc.readRemainingPadding > 0 {
_, err := io.CopyN(io.Discard, vc.ExtendedReader, int64(vc.readRemainingPadding))
if err != nil {
return err
}
vc.readRemainingPadding = 0
}
if vc.readProcess {
switch vc.readLastCommand {
case commandPaddingContinue:
//if vc.isTLS || vc.packetsToFilter > 0 {
headerUUIDLen := 0
if vc.readFilterUUID {
headerUUIDLen = uuid.Size
}
var header []byte
if need := headerUUIDLen + paddingHeaderLen; buffer.FreeLen() < need {
header = make([]byte, need)
} else {
header = buffer.FreeBytes()[:need]
}
_, err := io.ReadFull(vc.ExtendedReader, header)
if err != nil {
return err
}
pos := 0
if vc.readFilterUUID {
vc.readFilterUUID = false
pos = uuid.Size
if subtle.ConstantTimeCompare(vc.id.Bytes(), header[:uuid.Size]) != 1 {
err = fmt.Errorf("XTLS Vision server responded unknown UUID: %s",
uuid.FromBytesOrNil(header[:uuid.Size]).String())
log.Errorln(err.Error())
return err
}
}
vc.readLastCommand = header[pos]
vc.readRemainingContent = int(binary.BigEndian.Uint16(header[pos+1:]))
vc.readRemainingPadding = int(binary.BigEndian.Uint16(header[pos+3:]))
log.Debugln("XTLS Vision read padding: command=%d, payloadLen=%d, paddingLen=%d",
vc.readLastCommand, vc.readRemainingContent, vc.readRemainingPadding)
return vc.ReadBuffer(buffer)
//}
case commandPaddingEnd:
vc.readProcess = false
return vc.ReadBuffer(buffer)
case commandPaddingDirect:
if vc.input != nil {
_, err := buffer.ReadFrom(vc.input)
if err != nil {
return err
}
if vc.input.Len() == 0 {
vc.input = nil
}
if buffer.IsFull() {
return nil
}
}
if vc.rawInput != nil {
_, err := buffer.ReadFrom(vc.rawInput)
if err != nil {
return err
}
if vc.rawInput.Len() == 0 {
vc.rawInput = nil
}
}
if vc.input == nil && vc.rawInput == nil {
vc.readProcess = false
vc.ExtendedReader = N.NewExtendedReader(vc.Conn)
log.Debugln("XTLS Vision direct read start")
}
default:
err := fmt.Errorf("XTLS Vision read unknown command: %d", vc.readLastCommand)
log.Debugln(err.Error())
return err
}
}
return vc.ExtendedReader.ReadBuffer(buffer)
}
if err := vc.recvResponse(); err != nil {
return err
}
vc.received = true
return vc.ExtendedConn.ReadBuffer(buffer)
return vc.ReadBuffer(buffer)
}
func (vc *Conn) Write(p []byte) (int, error) {
@ -66,7 +189,19 @@ func (vc *Conn) Write(p []byte) (int, error) {
return 0, vc.err
}
}
return vc.ExtendedConn.Write(p)
if vc.writeFilterApplicationData {
_buffer := buf.StackNew()
defer buf.KeepAlive(_buffer)
buffer := buf.Dup(_buffer)
defer buffer.Release()
buffer.Write(p)
err := vc.WriteBuffer(buffer)
if err != nil {
return 0, err
}
return len(p), nil
}
return vc.ExtendedWriter.Write(p)
}
func (vc *Conn) WriteBuffer(buffer *buf.Buffer) error {
@ -80,7 +215,57 @@ func (vc *Conn) WriteBuffer(buffer *buf.Buffer) error {
return vc.err
}
}
return vc.ExtendedConn.WriteBuffer(buffer)
if vc.writeFilterApplicationData && vc.isTLS {
buffer2 := ReshapeBuffer(buffer)
defer buffer2.Release()
vc.FilterTLS(buffer.Bytes())
command := commandPaddingContinue
if buffer.Len() > 6 && bytes.Equal(buffer.To(3), tlsApplicationDataStart) || vc.packetsToFilter <= 0 {
command = commandPaddingEnd
if vc.enableXTLS {
command = commandPaddingDirect
vc.writeDirect = true
}
vc.writeFilterApplicationData = false
}
ApplyPadding(buffer, command, nil)
err := vc.ExtendedWriter.WriteBuffer(buffer)
if err != nil {
return err
}
if vc.writeDirect {
vc.ExtendedWriter = N.NewExtendedWriter(vc.Conn)
log.Debugln("XTLS Vision direct write start")
//time.Sleep(10 * time.Millisecond)
}
if buffer2 != nil {
if vc.writeDirect {
return vc.ExtendedWriter.WriteBuffer(buffer2)
}
vc.FilterTLS(buffer2.Bytes())
command = commandPaddingContinue
if buffer2.Len() > 6 && bytes.Equal(buffer2.To(3), tlsApplicationDataStart) || vc.packetsToFilter <= 0 {
command = commandPaddingEnd
if vc.enableXTLS {
command = commandPaddingDirect
vc.writeDirect = true
}
vc.writeFilterApplicationData = false
}
ApplyPadding(buffer2, command, nil)
err = vc.ExtendedWriter.WriteBuffer(buffer2)
if vc.writeDirect {
vc.ExtendedWriter = N.NewExtendedWriter(vc.Conn)
log.Debugln("XTLS Vision direct write start")
//time.Sleep(10 * time.Millisecond)
}
}
return err
}
/*if vc.writeDirect {
log.Debugln("XTLS Vision Direct write, payloadLen=%d", buffer.Len())
}*/
return vc.ExtendedWriter.WriteBuffer(buffer)
}
func (vc *Conn) sendRequest(p []byte) bool {
@ -96,9 +281,6 @@ func (vc *Conn) sendRequest(p []byte) bool {
}
defer close(vc.handshake)
requestLen := 1 // protocol version
requestLen += 16 // UUID
requestLen += 1 // addons length
var addonsBytes []byte
if vc.addons != nil {
addonsBytes, vc.err = proto.Marshal(vc.addons)
@ -106,6 +288,18 @@ func (vc *Conn) sendRequest(p []byte) bool {
return true
}
}
isVision := vc.IsXTLSVisionEnabled()
var buffer *buf.Buffer
if isVision {
_buffer := buf.StackNew()
defer buf.KeepAlive(_buffer)
buffer = buf.Dup(_buffer)
defer buffer.Release()
} else {
requestLen := 1 // protocol version
requestLen += 16 // UUID
requestLen += 1 // addons length
requestLen += len(addonsBytes)
requestLen += 1 // command
if !vc.dst.Mux {
@ -117,8 +311,9 @@ func (vc *Conn) sendRequest(p []byte) bool {
_buffer := buf.StackNewSize(requestLen)
defer buf.KeepAlive(_buffer)
buffer := buf.Dup(_buffer)
buffer = buf.Dup(_buffer)
defer buffer.Release()
}
buf.Must(
buffer.WriteByte(Version), // protocol version
@ -143,15 +338,51 @@ func (vc *Conn) sendRequest(p []byte) bool {
)
}
if isVision && !vc.dst.UDP && !vc.dst.Mux {
if len(p) == 0 {
vc.packetsToFilter = 0
vc.writeFilterApplicationData = false
WriteWithPadding(buffer, nil, commandPaddingEnd, vc.id)
} else {
vc.FilterTLS(p)
if vc.isTLS {
WriteWithPadding(buffer, p, commandPaddingContinue, vc.id)
} else {
buf.Must(buf.Error(buffer.Write(p)))
vc.readProcess = false
vc.writeFilterApplicationData = false
vc.packetsToFilter = 0
}
}
} else {
buf.Must(buf.Error(buffer.Write(p)))
}
_, vc.err = vc.ExtendedConn.Write(buffer.Bytes())
_, vc.err = vc.ExtendedWriter.Write(buffer.Bytes())
if vc.err != nil {
return true
}
if isVision {
switch underlying := vc.tlsConn.(type) {
case *gotls.Conn:
if underlying.ConnectionState().Version != gotls.VersionTLS13 {
vc.err = ErrNotTLS13
}
case *utls.UConn:
if underlying.ConnectionState().Version != utls.VersionTLS13 {
vc.err = ErrNotTLS13
}
default:
vc.err = fmt.Errorf(`failed to use %s, maybe "security" is not "tls" or "utls"`, vc.addons.Flow)
}
vc.tlsConn = nil
}
return true
}
func (vc *Conn) recvResponse() error {
var buf [1]byte
_, vc.err = io.ReadFull(vc.ExtendedConn, buf[:])
_, vc.err = io.ReadFull(vc.ExtendedReader, buf[:])
if vc.err != nil {
return vc.err
}
@ -160,27 +391,43 @@ func (vc *Conn) recvResponse() error {
return errors.New("unexpected response version")
}
_, vc.err = io.ReadFull(vc.ExtendedConn, buf[:])
_, vc.err = io.ReadFull(vc.ExtendedReader, buf[:])
if vc.err != nil {
return vc.err
}
length := int64(buf[0])
if length != 0 { // addon data length > 0
io.CopyN(io.Discard, vc.ExtendedConn, length) // just discard
io.CopyN(io.Discard, vc.ExtendedReader, length) // just discard
}
return nil
}
func (vc *Conn) FrontHeadroom() int {
if vc.IsXTLSVisionEnabled() {
return paddingHeaderLen
}
return 0
}
func (vc *Conn) Upstream() any {
return vc.ExtendedConn
if vc.tlsConn == nil {
return vc.Conn
}
return vc.tlsConn
}
func (vc *Conn) IsXTLSVisionEnabled() bool {
return vc.addons != nil && vc.addons.Flow == XRV
}
// newConn return a Conn instance
func newConn(conn net.Conn, client *Client, dst *DstAddr) (*Conn, error) {
c := &Conn{
ExtendedConn: N.NewExtendedConn(conn),
ExtendedReader: N.NewExtendedReader(conn),
ExtendedWriter: N.NewExtendedWriter(conn),
Conn: conn,
id: client.uuid,
dst: dst,
handshake: make(chan struct{}),
@ -204,15 +451,42 @@ func newConn(conn net.Conn, client *Client, dst *DstAddr) (*Conn, error) {
} else {
return nil, fmt.Errorf("failed to use %s, maybe \"security\" is not \"xtls\"", client.Addons.Flow)
}
case XRV:
c.packetsToFilter = 6
c.readProcess = true
c.readFilterUUID = true
c.writeFilterApplicationData = true
c.addons = client.Addons
var t reflect.Type
var p uintptr
switch underlying := conn.(type) {
case *gotls.Conn:
c.Conn = underlying.NetConn()
c.tlsConn = underlying
t = reflect.TypeOf(underlying).Elem()
p = uintptr(unsafe.Pointer(underlying))
case *utls.UConn:
c.Conn = underlying.NetConn()
c.tlsConn = underlying
t = reflect.TypeOf(underlying.Conn).Elem()
p = uintptr(unsafe.Pointer(underlying.Conn))
case *tlsC.UConn:
c.Conn = underlying.NetConn()
c.tlsConn = underlying.UConn
t = reflect.TypeOf(underlying.Conn).Elem()
p = uintptr(unsafe.Pointer(underlying.Conn))
default:
return nil, fmt.Errorf(`failed to use %s, maybe "security" is not "tls" or "utls"`, client.Addons.Flow)
}
i, _ := t.FieldByName("input")
r, _ := t.FieldByName("rawInput")
c.input = (*bytes.Reader)(unsafe.Pointer(p + i.Offset))
c.rawInput = (*bytes.Buffer)(unsafe.Pointer(p + r.Offset))
if _, ok := c.Conn.(*net.TCPConn); !ok {
log.Debugln("XTLS underlying conn is not *net.TCPConn, got %s", reflect.TypeOf(conn).Name())
}
}
}
//go func() {
// select {
// case <-c.handshake:
// case <-time.After(200 * time.Millisecond):
// c.sendRequest(nil)
// }
//}()
return c, nil
}

79
transport/vless/filter.go Normal file
View file

@ -0,0 +1,79 @@
package vless
import (
"bytes"
"encoding/binary"
log "github.com/sirupsen/logrus"
)
var (
tls13SupportedVersions = []byte{0x00, 0x2b, 0x00, 0x02, 0x03, 0x04}
tlsClientHandshakeStart = []byte{0x16, 0x03}
tlsServerHandshakeStart = []byte{0x16, 0x03, 0x03}
tlsApplicationDataStart = []byte{0x17, 0x03, 0x03}
tls13CipherSuiteMap = map[uint16]string{
0x1301: "TLS_AES_128_GCM_SHA256",
0x1302: "TLS_AES_256_GCM_SHA384",
0x1303: "TLS_CHACHA20_POLY1305_SHA256",
0x1304: "TLS_AES_128_CCM_SHA256",
0x1305: "TLS_AES_128_CCM_8_SHA256",
}
)
const (
tlsHandshakeTypeClientHello byte = 0x01
tlsHandshakeTypeServerHello byte = 0x02
)
func (vc *Conn) FilterTLS(p []byte) (index int) {
if vc.packetsToFilter <= 0 {
return 0
}
lenP := len(p)
vc.packetsToFilter -= 1
if index = bytes.Index(p, tlsServerHandshakeStart); index != -1 {
if lenP >= index+5 && p[index+5] == tlsHandshakeTypeServerHello {
vc.remainingServerHello = binary.BigEndian.Uint16(p[index+3:]) + 5
vc.isTLS = true
vc.isTLS12orAbove = true
if lenP-index >= 79 && vc.remainingServerHello >= 79 {
sessionIDLen := int(p[index+43])
vc.cipher = binary.BigEndian.Uint16(p[index+43+sessionIDLen+1:])
}
}
} else if index = bytes.Index(p, tlsClientHandshakeStart); index != -1 {
if lenP >= index+5 && p[index+5] == tlsHandshakeTypeClientHello {
vc.isTLS = true
}
}
if vc.remainingServerHello > 0 {
end := vc.remainingServerHello
vc.remainingServerHello -= end
if end > uint16(lenP) {
end = uint16(lenP)
}
if bytes.Contains(p[index:end], tls13SupportedVersions) {
// TLS 1.3 Client Hello
cs, ok := tls13CipherSuiteMap[vc.cipher]
if ok && cs != "TLS_AES_128_CCM_8_SHA256" {
vc.enableXTLS = true
}
log.Debugln("XTLS Vision found TLS 1.3, packetLength=", lenP, ", CipherSuite=", cs)
vc.packetsToFilter = 0
return
} else if vc.remainingServerHello < 0 {
log.Debugln("XTLS Vision found TLS 1.2, packetLength=", lenP)
vc.packetsToFilter = 0
return
}
log.Debugln("XTLS Vision found inconclusive server hello, packetLength=", lenP,
", remainingServerHelloBytes=", vc.remainingServerHello)
}
if vc.packetsToFilter <= 0 {
log.Debugln("XTLS Vision stop filtering")
}
return
}

69
transport/vless/vision.go Normal file
View file

@ -0,0 +1,69 @@
package vless
import (
"bytes"
"encoding/binary"
"math/rand"
"github.com/Dreamacro/clash/common/buf"
"github.com/Dreamacro/clash/log"
"github.com/gofrs/uuid"
)
const (
paddingHeaderLen = 1 + 2 + 2 // =5
commandPaddingContinue byte = 0x00
commandPaddingEnd byte = 0x01
commandPaddingDirect byte = 0x02
)
func WriteWithPadding(buffer *buf.Buffer, p []byte, command byte, userUUID *uuid.UUID) {
contentLen := int32(len(p))
var paddingLen int32
if contentLen < 900 {
paddingLen = rand.Int31n(500) + 900 - contentLen
}
if userUUID != nil { // unnecessary, but keep the same with Xray
buffer.Write(userUUID.Bytes())
}
buffer.WriteByte(command)
binary.BigEndian.PutUint16(buffer.Extend(2), uint16(contentLen))
binary.BigEndian.PutUint16(buffer.Extend(2), uint16(paddingLen))
buffer.Write(p)
buffer.Extend(int(paddingLen))
log.Debugln("XTLS Vision write padding1: command=%v, payloadLen=%v, paddingLen=%v", command, contentLen, paddingLen)
}
func ApplyPadding(buffer *buf.Buffer, command byte, userUUID *uuid.UUID) {
contentLen := int32(buffer.Len())
var paddingLen int32
if contentLen < 900 {
paddingLen = rand.Int31n(500) + 900 - contentLen
}
binary.BigEndian.PutUint16(buffer.ExtendHeader(2), uint16(paddingLen))
binary.BigEndian.PutUint16(buffer.ExtendHeader(2), uint16(contentLen))
buffer.ExtendHeader(1)[0] = command
if userUUID != nil { // unnecessary, but keep the same with Xray
copy(buffer.ExtendHeader(uuid.Size), userUUID.Bytes())
}
buffer.Extend(int(paddingLen))
log.Debugln("XTLS Vision write padding2: command=%d, payloadLen=%d, paddingLen=%d", command, contentLen, paddingLen)
}
func ReshapeBuffer(buffer *buf.Buffer) *buf.Buffer {
if buffer.Len() <= buf.BufferSize-paddingHeaderLen {
return nil
}
cutAt := bytes.LastIndex(buffer.Bytes(), tlsApplicationDataStart)
if cutAt == -1 {
cutAt = buf.BufferSize / 2
}
buffer2 := buf.New()
buffer2.Write(buffer.From(cutAt))
buffer.Truncate(cutAt)
return buffer2
}

1
transport/vless/vless.go
View file

@ -12,6 +12,7 @@ const (
XRO = "xtls-rprx-origin"
XRD = "xtls-rprx-direct"
XRS = "xtls-rprx-splice"
XRV = "xtls-rprx-vision"
Version byte = 0 // protocol version. preview version is 0
)

5
transport/vless/xtls.go
View file

@ -2,6 +2,7 @@ package vless
import (
"context"
"errors"
"net"
tlsC "github.com/Dreamacro/clash/component/tls"
@ -9,6 +10,10 @@ import (
xtls "github.com/xtls/go"
)
var (
ErrNotTLS13 = errors.New("XTLS Vision based on TLS 1.3 outer connection")
)
type XTLSConfig struct {
Host string
SkipCertVerify bool