mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-22 23:13:01 +00:00
Refactor Vision reader writer
- Vision now use traffic states to capture two-way info about a connection - XTLS is de-couple with Vision, it only read traffic states to switch to direct copy mode - fix a edge case error when Vision unpadding read 5 command bytes
This commit is contained in:
yuhan6665
parent
efd32b0fb2
commit
d6d225c698
386
proxy/proxy.go
386
proxy/proxy.go
@ -6,10 +6,14 @@
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package proxy
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import (
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"bytes"
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"context"
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"crypto/rand"
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gotls "crypto/tls"
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"io"
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"math/big"
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"runtime"
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"strconv"
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"github.com/pires/go-proxyproto"
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"github.com/xtls/xray-core/common/buf"
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@ -27,6 +31,30 @@ import (
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"github.com/xtls/xray-core/transport/internet/tls"
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)
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var (
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Tls13SupportedVersions = []byte{0x00, 0x2b, 0x00, 0x02, 0x03, 0x04}
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TlsClientHandShakeStart = []byte{0x16, 0x03}
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TlsServerHandShakeStart = []byte{0x16, 0x03, 0x03}
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TlsApplicationDataStart = []byte{0x17, 0x03, 0x03}
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Tls13CipherSuiteDic = map[uint16]string{
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0x1301: "TLS_AES_128_GCM_SHA256",
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0x1302: "TLS_AES_256_GCM_SHA384",
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0x1303: "TLS_CHACHA20_POLY1305_SHA256",
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0x1304: "TLS_AES_128_CCM_SHA256",
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0x1305: "TLS_AES_128_CCM_8_SHA256",
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}
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)
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const (
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TlsHandshakeTypeClientHello byte = 0x01
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TlsHandshakeTypeServerHello byte = 0x02
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CommandPaddingContinue byte = 0x00
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CommandPaddingEnd byte = 0x01
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CommandPaddingDirect byte = 0x02
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)
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// An Inbound processes inbound connections.
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type Inbound interface {
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// Network returns a list of networks that this inbound supports. Connections with not-supported networks will not be passed into Process().
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@ -59,6 +87,364 @@ type GetOutbound interface {
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GetOutbound() Outbound
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}
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// TrafficState is used to track uplink and downlink of one connection
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// It is used by XTLS to determine if switch to raw copy mode, It is used by Vision to calculate padding
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type TrafficState struct {
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UserUUID []byte
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NumberOfPacketToFilter int
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EnableXtls bool
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IsTLS12orAbove bool
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IsTLS bool
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Cipher uint16
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RemainingServerHello int32
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// reader link state
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WithinPaddingBuffers bool
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ReaderSwitchToDirectCopy bool
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RemainingCommand int32
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RemainingContent int32
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RemainingPadding int32
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CurrentCommand int
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// write link state
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IsPadding bool
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WriterSwitchToDirectCopy bool
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}
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func NewTrafficState(userUUID []byte) *TrafficState {
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return &TrafficState{
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UserUUID: userUUID,
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NumberOfPacketToFilter: 8,
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EnableXtls: false,
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IsTLS12orAbove: false,
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IsTLS: false,
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Cipher: 0,
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RemainingServerHello: -1,
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WithinPaddingBuffers: true,
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ReaderSwitchToDirectCopy: false,
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RemainingCommand: -1,
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RemainingContent: -1,
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RemainingPadding: -1,
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CurrentCommand: 0,
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IsPadding: true,
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WriterSwitchToDirectCopy: false,
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}
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}
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// VisionReader is used to read xtls vision protocol
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// Note Vision probably only make sense as the inner most layer of reader, since it need assess traffic state from origin proxy traffic
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type VisionReader struct {
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buf.Reader
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trafficState *TrafficState
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ctx context.Context
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}
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func NewVisionReader(reader buf.Reader, state *TrafficState, context context.Context) *VisionReader {
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return &VisionReader{
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Reader: reader,
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trafficState: state,
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ctx: context,
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}
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}
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func (w *VisionReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
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buffer, err := w.Reader.ReadMultiBuffer()
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if !buffer.IsEmpty() {
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if w.trafficState.WithinPaddingBuffers || w.trafficState.NumberOfPacketToFilter > 0 {
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mb2 := make(buf.MultiBuffer, 0, len(buffer))
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for _, b := range buffer {
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newbuffer := XtlsUnpadding(b, w.trafficState, w.ctx)
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if newbuffer.Len() > 0 {
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mb2 = append(mb2, newbuffer)
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}
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}
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buffer = mb2
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if w.trafficState.RemainingContent == 0 && w.trafficState.RemainingPadding == 0 {
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if w.trafficState.CurrentCommand == 1 {
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w.trafficState.WithinPaddingBuffers = false
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} else if w.trafficState.CurrentCommand == 2 {
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w.trafficState.WithinPaddingBuffers = false
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w.trafficState.ReaderSwitchToDirectCopy = true
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} else if w.trafficState.CurrentCommand == 0 {
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w.trafficState.WithinPaddingBuffers = true
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} else {
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newError("XtlsRead unknown command ", w.trafficState.CurrentCommand, buffer.Len()).WriteToLog(session.ExportIDToError(w.ctx))
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}
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} else if w.trafficState.RemainingContent > 0 || w.trafficState.RemainingPadding > 0 {
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w.trafficState.WithinPaddingBuffers = true
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} else {
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w.trafficState.WithinPaddingBuffers = false
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}
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}
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if w.trafficState.NumberOfPacketToFilter > 0 {
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XtlsFilterTls(buffer, w.trafficState, w.ctx)
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}
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}
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return buffer, err
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}
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// VisionWriter is used to write xtls vision protocol
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// Note Vision probably only make sense as the inner most layer of writer, since it need assess traffic state from origin proxy traffic
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type VisionWriter struct {
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buf.Writer
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trafficState *TrafficState
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ctx context.Context
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writeOnceUserUUID []byte
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}
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func NewVisionWriter(writer buf.Writer, state *TrafficState, context context.Context) *VisionWriter {
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w := make([]byte, len(state.UserUUID))
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copy(w, state.UserUUID)
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return &VisionWriter{
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Writer: writer,
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trafficState: state,
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ctx: context,
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writeOnceUserUUID: w,
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}
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}
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func (w *VisionWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
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if w.trafficState.NumberOfPacketToFilter > 0 {
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XtlsFilterTls(mb, w.trafficState, w.ctx)
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}
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if w.trafficState.IsPadding {
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if len(mb) == 1 && mb[0] == nil {
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mb[0] = XtlsPadding(nil, CommandPaddingContinue, &w.writeOnceUserUUID, true, w.ctx) // we do a long padding to hide vless header
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return w.Writer.WriteMultiBuffer(mb)
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}
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mb = ReshapeMultiBuffer(w.ctx, mb)
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longPadding := w.trafficState.IsTLS
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for i, b := range mb {
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if w.trafficState.IsTLS && b.Len() >= 6 && bytes.Equal(TlsApplicationDataStart, b.BytesTo(3)) {
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if w.trafficState.EnableXtls {
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w.trafficState.WriterSwitchToDirectCopy = true
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}
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var command byte = CommandPaddingContinue
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if i == len(mb) - 1 {
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command = CommandPaddingEnd
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if w.trafficState.EnableXtls {
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command = CommandPaddingDirect
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}
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}
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mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, true, w.ctx)
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w.trafficState.IsPadding = false // padding going to end
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longPadding = false
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continue
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} else if !w.trafficState.IsTLS12orAbove && w.trafficState.NumberOfPacketToFilter <= 1 { // For compatibility with earlier vision receiver, we finish padding 1 packet early
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w.trafficState.IsPadding = false
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mb[i] = XtlsPadding(b, CommandPaddingEnd, &w.writeOnceUserUUID, longPadding, w.ctx)
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break
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}
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var command byte = CommandPaddingContinue
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if i == len(mb) - 1 && !w.trafficState.IsPadding {
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command = CommandPaddingEnd
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if w.trafficState.EnableXtls {
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command = CommandPaddingDirect
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}
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}
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mb[i] = XtlsPadding(b, command, &w.writeOnceUserUUID, longPadding, w.ctx)
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}
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}
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return w.Writer.WriteMultiBuffer(mb)
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}
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// ReshapeMultiBuffer prepare multi buffer for padding stucture (max 21 bytes)
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func ReshapeMultiBuffer(ctx context.Context, buffer buf.MultiBuffer) buf.MultiBuffer {
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needReshape := 0
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for _, b := range buffer {
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if b.Len() >= buf.Size-21 {
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needReshape += 1
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}
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}
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if needReshape == 0 {
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return buffer
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}
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mb2 := make(buf.MultiBuffer, 0, len(buffer)+needReshape)
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toPrint := ""
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for i, buffer1 := range buffer {
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if buffer1.Len() >= buf.Size-21 {
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index := int32(bytes.LastIndex(buffer1.Bytes(), TlsApplicationDataStart))
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if index <= 0 || index > buf.Size-21 {
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index = buf.Size / 2
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}
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buffer2 := buf.New()
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buffer2.Write(buffer1.BytesFrom(index))
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buffer1.Resize(0, index)
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mb2 = append(mb2, buffer1, buffer2)
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toPrint += " " + strconv.Itoa(int(buffer1.Len())) + " " + strconv.Itoa(int(buffer2.Len()))
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} else {
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mb2 = append(mb2, buffer1)
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toPrint += " " + strconv.Itoa(int(buffer1.Len()))
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}
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buffer[i] = nil
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}
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buffer = buffer[:0]
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newError("ReshapeMultiBuffer ", toPrint).WriteToLog(session.ExportIDToError(ctx))
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return mb2
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}
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// XtlsPadding add padding to eliminate length siganature during tls handshake
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func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool, ctx context.Context) *buf.Buffer {
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var contentLen int32 = 0
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var paddingLen int32 = 0
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if b != nil {
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contentLen = b.Len()
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}
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if contentLen < 900 && longPadding {
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l, err := rand.Int(rand.Reader, big.NewInt(500))
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if err != nil {
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newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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paddingLen = int32(l.Int64()) + 900 - contentLen
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} else {
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l, err := rand.Int(rand.Reader, big.NewInt(256))
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if err != nil {
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newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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paddingLen = int32(l.Int64())
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}
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if paddingLen > buf.Size-21-contentLen {
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paddingLen = buf.Size - 21 - contentLen
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}
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newbuffer := buf.New()
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if userUUID != nil {
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newbuffer.Write(*userUUID)
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*userUUID = nil
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}
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newbuffer.Write([]byte{command, byte(contentLen >> 8), byte(contentLen), byte(paddingLen >> 8), byte(paddingLen)})
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if b != nil {
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newbuffer.Write(b.Bytes())
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b.Release()
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b = nil
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}
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newbuffer.Extend(paddingLen)
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newError("XtlsPadding ", contentLen, " ", paddingLen, " ", command).WriteToLog(session.ExportIDToError(ctx))
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return newbuffer
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}
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// XtlsUnpadding remove padding and parse command
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func XtlsUnpadding(b *buf.Buffer, s *TrafficState, ctx context.Context) *buf.Buffer {
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if s.RemainingCommand == -1 && s.RemainingContent == -1 && s.RemainingPadding == -1 { // inital state
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if b.Len() >= 21 && bytes.Equal(s.UserUUID, b.BytesTo(16)) {
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b.Advance(16)
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s.RemainingCommand = 5
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} else {
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return b
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}
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}
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newbuffer := buf.New()
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for b.Len() > 0 {
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if s.RemainingCommand > 0 {
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data, err := b.ReadByte()
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if err != nil {
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return newbuffer
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}
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switch s.RemainingCommand {
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case 5:
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s.CurrentCommand = int(data)
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case 4:
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s.RemainingContent = int32(data)<<8
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case 3:
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s.RemainingContent = s.RemainingContent | int32(data)
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case 2:
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s.RemainingPadding = int32(data)<<8
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case 1:
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s.RemainingPadding = s.RemainingPadding | int32(data)
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newError("Xtls Unpadding new block, content ", s.RemainingContent, " padding ", s.RemainingPadding, " command ", s.CurrentCommand).WriteToLog(session.ExportIDToError(ctx))
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}
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s.RemainingCommand--
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} else if s.RemainingContent > 0 {
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len := s.RemainingContent
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if b.Len() < len {
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len = b.Len()
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}
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data, err := b.ReadBytes(len)
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if err != nil {
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return newbuffer
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}
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newbuffer.Write(data)
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s.RemainingContent -= len
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} else { // remainingPadding > 0
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len := s.RemainingPadding
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if b.Len() < len {
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len = b.Len()
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}
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b.Advance(len)
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s.RemainingPadding -= len
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}
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if s.RemainingCommand <= 0 && s.RemainingContent <= 0 && s.RemainingPadding <= 0 { // this block done
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if s.CurrentCommand == 0 {
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s.RemainingCommand = 5
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} else {
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s.RemainingCommand = -1 // set to initial state
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s.RemainingContent = -1
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s.RemainingPadding = -1
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if b.Len() > 0 { // shouldn't happen
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newbuffer.Write(b.Bytes())
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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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b.Release()
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b = nil
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return newbuffer
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}
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// XtlsFilterTls filter and recognize tls 1.3 and other info
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func XtlsFilterTls(buffer buf.MultiBuffer, trafficState *TrafficState, ctx context.Context) {
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for _, b := range buffer {
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if b == nil {
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continue
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}
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trafficState.NumberOfPacketToFilter--
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if b.Len() >= 6 {
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startsBytes := b.BytesTo(6)
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if bytes.Equal(TlsServerHandShakeStart, startsBytes[:3]) && startsBytes[5] == TlsHandshakeTypeServerHello {
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trafficState.RemainingServerHello = (int32(startsBytes[3])<<8 | int32(startsBytes[4])) + 5
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trafficState.IsTLS12orAbove = true
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trafficState.IsTLS = true
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if b.Len() >= 79 && trafficState.RemainingServerHello >= 79 {
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sessionIdLen := int32(b.Byte(43))
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cipherSuite := b.BytesRange(43+sessionIdLen+1, 43+sessionIdLen+3)
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trafficState.Cipher = uint16(cipherSuite[0])<<8 | uint16(cipherSuite[1])
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} else {
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newError("XtlsFilterTls short server hello, tls 1.2 or older? ", b.Len(), " ", trafficState.RemainingServerHello).WriteToLog(session.ExportIDToError(ctx))
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}
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} else if bytes.Equal(TlsClientHandShakeStart, startsBytes[:2]) && startsBytes[5] == TlsHandshakeTypeClientHello {
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trafficState.IsTLS = true
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newError("XtlsFilterTls found tls client hello! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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if trafficState.RemainingServerHello > 0 {
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end := trafficState.RemainingServerHello
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if end > b.Len() {
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end = b.Len()
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}
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trafficState.RemainingServerHello -= b.Len()
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if bytes.Contains(b.BytesTo(end), Tls13SupportedVersions) {
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v, ok := Tls13CipherSuiteDic[trafficState.Cipher]
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if !ok {
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v = "Old cipher: " + strconv.FormatUint(uint64(trafficState.Cipher), 16)
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} else if v != "TLS_AES_128_CCM_8_SHA256" {
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trafficState.EnableXtls = true
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}
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newError("XtlsFilterTls found tls 1.3! ", b.Len(), " ", v).WriteToLog(session.ExportIDToError(ctx))
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trafficState.NumberOfPacketToFilter = 0
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return
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} else if trafficState.RemainingServerHello <= 0 {
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newError("XtlsFilterTls found tls 1.2! ", b.Len()).WriteToLog(session.ExportIDToError(ctx))
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trafficState.NumberOfPacketToFilter = 0
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return
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}
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newError("XtlsFilterTls inconclusive server hello ", b.Len(), " ", trafficState.RemainingServerHello).WriteToLog(session.ExportIDToError(ctx))
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}
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if trafficState.NumberOfPacketToFilter <= 0 {
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newError("XtlsFilterTls stop filtering", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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}
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// UnwrapRawConn support unwrap stats, tls, utls, reality and proxyproto conn and get raw tcp conn from it
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func UnwrapRawConn(conn net.Conn) (net.Conn, stats.Counter, stats.Counter) {
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var readCounter, writerCounter stats.Counter
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@ -1,10 +1,12 @@
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package encoding
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import (
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"context"
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"io"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/protocol"
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"github.com/xtls/xray-core/proxy"
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"github.com/xtls/xray-core/proxy/vless"
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"google.golang.org/protobuf/proto"
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)
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@ -58,14 +60,19 @@ func DecodeHeaderAddons(buffer *buf.Buffer, reader io.Reader) (*Addons, error) {
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}
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// EncodeBodyAddons returns a Writer that auto-encrypt content written by caller.
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func EncodeBodyAddons(writer io.Writer, request *protocol.RequestHeader, addons *Addons) buf.Writer {
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switch addons.Flow {
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default:
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if request.Command == protocol.RequestCommandUDP {
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return NewMultiLengthPacketWriter(writer.(buf.Writer))
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func EncodeBodyAddons(writer io.Writer, request *protocol.RequestHeader, requestAddons *Addons, state *proxy.TrafficState, context context.Context) buf.Writer {
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if request.Command == protocol.RequestCommandUDP {
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w := writer.(buf.Writer)
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if requestAddons.Flow == vless.XRV {
|
||||
w = proxy.NewVisionWriter(w, state, context)
|
||||
}
|
||||
return NewMultiLengthPacketWriter(w)
|
||||
}
|
||||
return buf.NewWriter(writer)
|
||||
w := buf.NewWriter(writer)
|
||||
if requestAddons.Flow == vless.XRV {
|
||||
w = proxy.NewVisionWriter(w, state, context)
|
||||
}
|
||||
return w
|
||||
}
|
||||
|
||||
// DecodeBodyAddons returns a Reader from which caller can fetch decrypted body.
|
||||
|
||||
@ -5,11 +5,7 @@ package encoding
|
||||
import (
|
||||
"bytes"
|
||||
"context"
|
||||
"crypto/rand"
|
||||
"io"
|
||||
"math/big"
|
||||
"strconv"
|
||||
"time"
|
||||
|
||||
"github.com/xtls/xray-core/common/buf"
|
||||
"github.com/xtls/xray-core/common/errors"
|
||||
@ -26,30 +22,6 @@ const (
|
||||
Version = byte(0)
|
||||
)
|
||||
|
||||
var (
|
||||
tls13SupportedVersions = []byte{0x00, 0x2b, 0x00, 0x02, 0x03, 0x04}
|
||||
tlsClientHandShakeStart = []byte{0x16, 0x03}
|
||||
tlsServerHandShakeStart = []byte{0x16, 0x03, 0x03}
|
||||
tlsApplicationDataStart = []byte{0x17, 0x03, 0x03}
|
||||
|
||||
Tls13CipherSuiteDic = 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
|
||||
|
||||
CommandPaddingContinue byte = 0x00
|
||||
CommandPaddingEnd byte = 0x01
|
||||
CommandPaddingDirect byte = 0x02
|
||||
)
|
||||
|
||||
var addrParser = protocol.NewAddressParser(
|
||||
protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv4), net.AddressFamilyIPv4),
|
||||
protocol.AddressFamilyByte(byte(protocol.AddressTypeDomain), net.AddressFamilyDomain),
|
||||
@ -202,18 +174,11 @@ func DecodeResponseHeader(reader io.Reader, request *protocol.RequestHeader) (*A
|
||||
}
|
||||
|
||||
// XtlsRead filter and read xtls protocol
|
||||
func XtlsRead(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, input *bytes.Reader, rawInput *bytes.Buffer,
|
||||
ctx context.Context, userUUID []byte, numberOfPacketToFilter *int, enableXtls *bool,
|
||||
isTLS12orAbove *bool, isTLS *bool, cipher *uint16, remainingServerHello *int32,
|
||||
) error {
|
||||
func XtlsRead(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, input *bytes.Reader, rawInput *bytes.Buffer, trafficState *proxy.TrafficState, ctx context.Context) error {
|
||||
err := func() error {
|
||||
withinPaddingBuffers := true
|
||||
shouldSwitchToDirectCopy := false
|
||||
var remainingContent int32 = -1
|
||||
var remainingPadding int32 = -1
|
||||
currentCommand := 0
|
||||
visionReader := proxy.NewVisionReader(reader, trafficState, ctx)
|
||||
for {
|
||||
if shouldSwitchToDirectCopy {
|
||||
if trafficState.ReaderSwitchToDirectCopy {
|
||||
var writerConn net.Conn
|
||||
if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Conn != nil {
|
||||
writerConn = inbound.Conn
|
||||
@ -223,44 +188,22 @@ func XtlsRead(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater
|
||||
}
|
||||
return proxy.CopyRawConnIfExist(ctx, conn, writerConn, writer, timer)
|
||||
}
|
||||
buffer, err := reader.ReadMultiBuffer()
|
||||
buffer, err := visionReader.ReadMultiBuffer()
|
||||
if !buffer.IsEmpty() {
|
||||
if withinPaddingBuffers || *numberOfPacketToFilter > 0 {
|
||||
buffer = XtlsUnpadding(ctx, buffer, userUUID, &remainingContent, &remainingPadding, ¤tCommand)
|
||||
if remainingContent == 0 && remainingPadding == 0 {
|
||||
if currentCommand == 1 {
|
||||
withinPaddingBuffers = false
|
||||
remainingContent = -1
|
||||
remainingPadding = -1 // set to initial state to parse the next padding
|
||||
} else if currentCommand == 2 {
|
||||
withinPaddingBuffers = false
|
||||
shouldSwitchToDirectCopy = true
|
||||
// XTLS Vision processes struct TLS Conn's input and rawInput
|
||||
if inputBuffer, err := buf.ReadFrom(input); err == nil {
|
||||
if !inputBuffer.IsEmpty() {
|
||||
buffer, _ = buf.MergeMulti(buffer, inputBuffer)
|
||||
}
|
||||
}
|
||||
if rawInputBuffer, err := buf.ReadFrom(rawInput); err == nil {
|
||||
if !rawInputBuffer.IsEmpty() {
|
||||
buffer, _ = buf.MergeMulti(buffer, rawInputBuffer)
|
||||
}
|
||||
}
|
||||
} else if currentCommand == 0 {
|
||||
withinPaddingBuffers = true
|
||||
} else {
|
||||
newError("XtlsRead unknown command ", currentCommand, buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
||||
timer.Update()
|
||||
if trafficState.ReaderSwitchToDirectCopy {
|
||||
// XTLS Vision processes struct TLS Conn's input and rawInput
|
||||
if inputBuffer, err := buf.ReadFrom(input); err == nil {
|
||||
if !inputBuffer.IsEmpty() {
|
||||
buffer, _ = buf.MergeMulti(buffer, inputBuffer)
|
||||
}
|
||||
}
|
||||
if rawInputBuffer, err := buf.ReadFrom(rawInput); err == nil {
|
||||
if !rawInputBuffer.IsEmpty() {
|
||||
buffer, _ = buf.MergeMulti(buffer, rawInputBuffer)
|
||||
}
|
||||
} else if remainingContent > 0 || remainingPadding > 0 {
|
||||
withinPaddingBuffers = true
|
||||
} else {
|
||||
withinPaddingBuffers = false
|
||||
}
|
||||
}
|
||||
if *numberOfPacketToFilter > 0 {
|
||||
XtlsFilterTls(buffer, numberOfPacketToFilter, enableXtls, isTLS12orAbove, isTLS, cipher, remainingServerHello, ctx)
|
||||
}
|
||||
timer.Update()
|
||||
if werr := writer.WriteMultiBuffer(buffer); werr != nil {
|
||||
return werr
|
||||
}
|
||||
@ -277,68 +220,27 @@ func XtlsRead(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater
|
||||
}
|
||||
|
||||
// XtlsWrite filter and write xtls protocol
|
||||
func XtlsWrite(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn,
|
||||
ctx context.Context, numberOfPacketToFilter *int, enableXtls *bool, isTLS12orAbove *bool, isTLS *bool,
|
||||
cipher *uint16, remainingServerHello *int32,
|
||||
) error {
|
||||
func XtlsWrite(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn net.Conn, trafficState *proxy.TrafficState, ctx context.Context) error {
|
||||
err := func() error {
|
||||
var ct stats.Counter
|
||||
isPadding := true
|
||||
shouldSwitchToDirectCopy := false
|
||||
for {
|
||||
buffer, err := reader.ReadMultiBuffer()
|
||||
if trafficState.WriterSwitchToDirectCopy {
|
||||
if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.CanSpliceCopy == 2 {
|
||||
inbound.CanSpliceCopy = 1 // force the value to 1, don't use setter
|
||||
}
|
||||
rawConn, _, writerCounter := proxy.UnwrapRawConn(conn)
|
||||
writer = buf.NewWriter(rawConn)
|
||||
ct = writerCounter
|
||||
trafficState.WriterSwitchToDirectCopy = false
|
||||
}
|
||||
if !buffer.IsEmpty() {
|
||||
if *numberOfPacketToFilter > 0 {
|
||||
XtlsFilterTls(buffer, numberOfPacketToFilter, enableXtls, isTLS12orAbove, isTLS, cipher, remainingServerHello, ctx)
|
||||
if ct != nil {
|
||||
ct.Add(int64(buffer.Len()))
|
||||
}
|
||||
if isPadding {
|
||||
buffer = ReshapeMultiBuffer(ctx, buffer)
|
||||
var xtlsSpecIndex int
|
||||
for i, b := range buffer {
|
||||
if *isTLS && b.Len() >= 6 && bytes.Equal(tlsApplicationDataStart, b.BytesTo(3)) {
|
||||
var command byte = CommandPaddingEnd
|
||||
if *enableXtls {
|
||||
shouldSwitchToDirectCopy = true
|
||||
xtlsSpecIndex = i
|
||||
command = CommandPaddingDirect
|
||||
}
|
||||
isPadding = false
|
||||
buffer[i] = XtlsPadding(b, command, nil, *isTLS, ctx)
|
||||
break
|
||||
} else if !*isTLS12orAbove && *numberOfPacketToFilter <= 1 { // For compatibility with earlier vision receiver, we finish padding 1 packet early
|
||||
isPadding = false
|
||||
buffer[i] = XtlsPadding(b, CommandPaddingEnd, nil, *isTLS, ctx)
|
||||
break
|
||||
}
|
||||
buffer[i] = XtlsPadding(b, CommandPaddingContinue, nil, *isTLS, ctx)
|
||||
}
|
||||
if shouldSwitchToDirectCopy {
|
||||
encryptBuffer, directBuffer := buf.SplitMulti(buffer, xtlsSpecIndex+1)
|
||||
if !encryptBuffer.IsEmpty() {
|
||||
timer.Update()
|
||||
if werr := writer.WriteMultiBuffer(encryptBuffer); werr != nil {
|
||||
return werr
|
||||
}
|
||||
}
|
||||
time.Sleep(5 * time.Millisecond) // for some device, the first xtls direct packet fails without this delay
|
||||
|
||||
if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.CanSpliceCopy == 2 {
|
||||
inbound.CanSpliceCopy = 1 // force the value to 1, don't use setter
|
||||
}
|
||||
buffer = directBuffer
|
||||
rawConn, _, writerCounter := proxy.UnwrapRawConn(conn)
|
||||
writer = buf.NewWriter(rawConn)
|
||||
ct = writerCounter
|
||||
}
|
||||
}
|
||||
if !buffer.IsEmpty() {
|
||||
if ct != nil {
|
||||
ct.Add(int64(buffer.Len()))
|
||||
}
|
||||
timer.Update()
|
||||
if werr := writer.WriteMultiBuffer(buffer); werr != nil {
|
||||
return werr
|
||||
}
|
||||
timer.Update()
|
||||
if werr := writer.WriteMultiBuffer(buffer); werr != nil {
|
||||
return werr
|
||||
}
|
||||
}
|
||||
if err != nil {
|
||||
@ -351,201 +253,3 @@ func XtlsWrite(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdate
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// XtlsFilterTls filter and recognize tls 1.3 and other info
|
||||
func XtlsFilterTls(buffer buf.MultiBuffer, numberOfPacketToFilter *int, enableXtls *bool, isTLS12orAbove *bool, isTLS *bool,
|
||||
cipher *uint16, remainingServerHello *int32, ctx context.Context,
|
||||
) {
|
||||
for _, b := range buffer {
|
||||
*numberOfPacketToFilter--
|
||||
if b.Len() >= 6 {
|
||||
startsBytes := b.BytesTo(6)
|
||||
if bytes.Equal(tlsServerHandShakeStart, startsBytes[:3]) && startsBytes[5] == tlsHandshakeTypeServerHello {
|
||||
*remainingServerHello = (int32(startsBytes[3])<<8 | int32(startsBytes[4])) + 5
|
||||
*isTLS12orAbove = true
|
||||
*isTLS = true
|
||||
if b.Len() >= 79 && *remainingServerHello >= 79 {
|
||||
sessionIdLen := int32(b.Byte(43))
|
||||
cipherSuite := b.BytesRange(43+sessionIdLen+1, 43+sessionIdLen+3)
|
||||
*cipher = uint16(cipherSuite[0])<<8 | uint16(cipherSuite[1])
|
||||
} else {
|
||||
newError("XtlsFilterTls short server hello, tls 1.2 or older? ", b.Len(), " ", *remainingServerHello).WriteToLog(session.ExportIDToError(ctx))
|
||||
}
|
||||
} else if bytes.Equal(tlsClientHandShakeStart, startsBytes[:2]) && startsBytes[5] == tlsHandshakeTypeClientHello {
|
||||
*isTLS = true
|
||||
newError("XtlsFilterTls found tls client hello! ", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
||||
}
|
||||
}
|
||||
if *remainingServerHello > 0 {
|
||||
end := *remainingServerHello
|
||||
if end > b.Len() {
|
||||
end = b.Len()
|
||||
}
|
||||
*remainingServerHello -= b.Len()
|
||||
if bytes.Contains(b.BytesTo(end), tls13SupportedVersions) {
|
||||
v, ok := Tls13CipherSuiteDic[*cipher]
|
||||
if !ok {
|
||||
v = "Old cipher: " + strconv.FormatUint(uint64(*cipher), 16)
|
||||
} else if v != "TLS_AES_128_CCM_8_SHA256" {
|
||||
*enableXtls = true
|
||||
}
|
||||
newError("XtlsFilterTls found tls 1.3! ", b.Len(), " ", v).WriteToLog(session.ExportIDToError(ctx))
|
||||
*numberOfPacketToFilter = 0
|
||||
return
|
||||
} else if *remainingServerHello <= 0 {
|
||||
newError("XtlsFilterTls found tls 1.2! ", b.Len()).WriteToLog(session.ExportIDToError(ctx))
|
||||
*numberOfPacketToFilter = 0
|
||||
return
|
||||
}
|
||||
newError("XtlsFilterTls inconclusive server hello ", b.Len(), " ", *remainingServerHello).WriteToLog(session.ExportIDToError(ctx))
|
||||
}
|
||||
if *numberOfPacketToFilter <= 0 {
|
||||
newError("XtlsFilterTls stop filtering", buffer.Len()).WriteToLog(session.ExportIDToError(ctx))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// ReshapeMultiBuffer prepare multi buffer for padding stucture (max 21 bytes)
|
||||
func ReshapeMultiBuffer(ctx context.Context, buffer buf.MultiBuffer) buf.MultiBuffer {
|
||||
needReshape := 0
|
||||
for _, b := range buffer {
|
||||
if b.Len() >= buf.Size-21 {
|
||||
needReshape += 1
|
||||
}
|
||||
}
|
||||
if needReshape == 0 {
|
||||
return buffer
|
||||
}
|
||||
mb2 := make(buf.MultiBuffer, 0, len(buffer)+needReshape)
|
||||
toPrint := ""
|
||||
for i, buffer1 := range buffer {
|
||||
if buffer1.Len() >= buf.Size-21 {
|
||||
index := int32(bytes.LastIndex(buffer1.Bytes(), tlsApplicationDataStart))
|
||||
if index <= 0 || index > buf.Size-21 {
|
||||
index = buf.Size / 2
|
||||
}
|
||||
buffer2 := buf.New()
|
||||
buffer2.Write(buffer1.BytesFrom(index))
|
||||
buffer1.Resize(0, index)
|
||||
mb2 = append(mb2, buffer1, buffer2)
|
||||
toPrint += " " + strconv.Itoa(int(buffer1.Len())) + " " + strconv.Itoa(int(buffer2.Len()))
|
||||
} else {
|
||||
mb2 = append(mb2, buffer1)
|
||||
toPrint += " " + strconv.Itoa(int(buffer1.Len()))
|
||||
}
|
||||
buffer[i] = nil
|
||||
}
|
||||
buffer = buffer[:0]
|
||||
newError("ReshapeMultiBuffer ", toPrint).WriteToLog(session.ExportIDToError(ctx))
|
||||
return mb2
|
||||
}
|
||||
|
||||
// XtlsPadding add padding to eliminate length siganature during tls handshake
|
||||
func XtlsPadding(b *buf.Buffer, command byte, userUUID *[]byte, longPadding bool, ctx context.Context) *buf.Buffer {
|
||||
var contentLen int32 = 0
|
||||
var paddingLen int32 = 0
|
||||
if b != nil {
|
||||
contentLen = b.Len()
|
||||
}
|
||||
if contentLen < 900 && longPadding {
|
||||
l, err := rand.Int(rand.Reader, big.NewInt(500))
|
||||
if err != nil {
|
||||
newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
|
||||
}
|
||||
paddingLen = int32(l.Int64()) + 900 - contentLen
|
||||
} else {
|
||||
l, err := rand.Int(rand.Reader, big.NewInt(256))
|
||||
if err != nil {
|
||||
newError("failed to generate padding").Base(err).WriteToLog(session.ExportIDToError(ctx))
|
||||
}
|
||||
paddingLen = int32(l.Int64())
|
||||
}
|
||||
if paddingLen > buf.Size-21-contentLen {
|
||||
paddingLen = buf.Size - 21 - contentLen
|
||||
}
|
||||
newbuffer := buf.New()
|
||||
if userUUID != nil {
|
||||
newbuffer.Write(*userUUID)
|
||||
*userUUID = nil
|
||||
}
|
||||
newbuffer.Write([]byte{command, byte(contentLen >> 8), byte(contentLen), byte(paddingLen >> 8), byte(paddingLen)})
|
||||
if b != nil {
|
||||
newbuffer.Write(b.Bytes())
|
||||
b.Release()
|
||||
b = nil
|
||||
}
|
||||
newbuffer.Extend(paddingLen)
|
||||
newError("XtlsPadding ", contentLen, " ", paddingLen, " ", command).WriteToLog(session.ExportIDToError(ctx))
|
||||
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
|
||||
*currentCommand = 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 { // possible buffer after padding, no need to worry about xtls (command 2)
|
||||
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
|
||||
}
|
||||
|
||||
@ -28,6 +28,7 @@ import (
|
||||
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/proxy"
|
||||
"github.com/xtls/xray-core/proxy/vless"
|
||||
"github.com/xtls/xray-core/proxy/vless/encoding"
|
||||
"github.com/xtls/xray-core/transport/internet/reality"
|
||||
@ -510,13 +511,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
|
||||
|
||||
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
|
||||
|
||||
trafficState := proxy.NewTrafficState(account.ID.Bytes())
|
||||
postRequest := func() error {
|
||||
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
|
||||
|
||||
@ -527,8 +522,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
|
||||
|
||||
if requestAddons.Flow == vless.XRV {
|
||||
ctx1 := session.ContextWithInbound(ctx, nil) // TODO enable splice
|
||||
err = encoding.XtlsRead(clientReader, serverWriter, timer, connection, input, rawInput, ctx1, account.ID.Bytes(),
|
||||
&numberOfPacketToFilter, &enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello)
|
||||
err = encoding.XtlsRead(clientReader, serverWriter, timer, connection, input, rawInput, trafficState, ctx1)
|
||||
} else {
|
||||
// from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBufer
|
||||
err = buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer))
|
||||
@ -550,19 +544,11 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
|
||||
}
|
||||
|
||||
// default: clientWriter := bufferWriter
|
||||
clientWriter := encoding.EncodeBodyAddons(bufferWriter, request, responseAddons)
|
||||
userUUID := account.ID.Bytes()
|
||||
clientWriter := encoding.EncodeBodyAddons(bufferWriter, request, requestAddons, trafficState, ctx)
|
||||
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 // ...
|
||||
}
|
||||
@ -573,8 +559,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
|
||||
|
||||
var err error
|
||||
if requestAddons.Flow == vless.XRV {
|
||||
err = encoding.XtlsWrite(serverReader, clientWriter, timer, connection, ctx, &numberOfPacketToFilter,
|
||||
&enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello)
|
||||
err = encoding.XtlsWrite(serverReader, clientWriter, timer, connection, trafficState, ctx)
|
||||
} else {
|
||||
// from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBufer
|
||||
err = buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer))
|
||||
|
||||
@ -22,6 +22,7 @@ import (
|
||||
"github.com/xtls/xray-core/common/xudp"
|
||||
"github.com/xtls/xray-core/core"
|
||||
"github.com/xtls/xray-core/features/policy"
|
||||
"github.com/xtls/xray-core/proxy"
|
||||
"github.com/xtls/xray-core/proxy/vless"
|
||||
"github.com/xtls/xray-core/proxy/vless/encoding"
|
||||
"github.com/xtls/xray-core/transport"
|
||||
@ -183,13 +184,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
|
||||
|
||||
clientReader := link.Reader // .(*pipe.Reader)
|
||||
clientWriter := link.Writer // .(*pipe.Writer)
|
||||
enableXtls := false
|
||||
isTLS12orAbove := false
|
||||
isTLS := false
|
||||
var cipher uint16 = 0
|
||||
var remainingServerHello int32 = -1
|
||||
numberOfPacketToFilter := 8
|
||||
|
||||
trafficState := proxy.NewTrafficState(account.ID.Bytes())
|
||||
if request.Command == protocol.RequestCommandUDP && h.cone && request.Port != 53 && request.Port != 443 {
|
||||
request.Command = protocol.RequestCommandMux
|
||||
request.Address = net.DomainAddress("v1.mux.cool")
|
||||
@ -205,22 +200,14 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
|
||||
}
|
||||
|
||||
// default: serverWriter := bufferWriter
|
||||
serverWriter := encoding.EncodeBodyAddons(bufferWriter, request, requestAddons)
|
||||
serverWriter := encoding.EncodeBodyAddons(bufferWriter, request, requestAddons, trafficState, ctx)
|
||||
if request.Command == protocol.RequestCommandMux && request.Port == 666 {
|
||||
serverWriter = xudp.NewPacketWriter(serverWriter, target, xudp.GetGlobalID(ctx))
|
||||
}
|
||||
userUUID := account.ID.Bytes()
|
||||
timeoutReader, ok := clientReader.(buf.TimeoutReader)
|
||||
if ok {
|
||||
multiBuffer, err1 := timeoutReader.ReadMultiBufferTimeout(time.Millisecond * 500)
|
||||
if err1 == nil {
|
||||
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 := serverWriter.WriteMultiBuffer(multiBuffer); err != nil {
|
||||
return err // ...
|
||||
}
|
||||
@ -228,10 +215,9 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
|
||||
return err1
|
||||
} else if requestAddons.Flow == vless.XRV {
|
||||
mb := make(buf.MultiBuffer, 1)
|
||||
mb[0] = encoding.XtlsPadding(nil, encoding.CommandPaddingContinue, &userUUID, true, ctx) // we do a long padding to hide vless header
|
||||
newError("Insert padding with empty content to camouflage VLESS header ", mb.Len()).WriteToLog(session.ExportIDToError(ctx))
|
||||
if err := serverWriter.WriteMultiBuffer(mb); err != nil {
|
||||
return err
|
||||
return err // ...
|
||||
}
|
||||
}
|
||||
} else {
|
||||
@ -254,8 +240,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
|
||||
}
|
||||
}
|
||||
ctx1 := session.ContextWithOutbound(ctx, nil) // TODO enable splice
|
||||
err = encoding.XtlsWrite(clientReader, serverWriter, timer, conn, ctx1, &numberOfPacketToFilter,
|
||||
&enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello)
|
||||
err = encoding.XtlsWrite(clientReader, serverWriter, timer, conn, trafficState, ctx1)
|
||||
} else {
|
||||
// from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBufer
|
||||
err = buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer))
|
||||
@ -286,8 +271,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
|
||||
}
|
||||
|
||||
if requestAddons.Flow == vless.XRV {
|
||||
err = encoding.XtlsRead(serverReader, clientWriter, timer, conn, input, rawInput, ctx, account.ID.Bytes(),
|
||||
&numberOfPacketToFilter, &enableXtls, &isTLS12orAbove, &isTLS, &cipher, &remainingServerHello)
|
||||
err = encoding.XtlsRead(serverReader, clientWriter, timer, conn, input, rawInput, trafficState, ctx)
|
||||
} else {
|
||||
// from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBufer
|
||||
err = buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer))
|
||||
|
||||
Loading…
Reference in New Issue
Block a user