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Quic sniffer (#1074)

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* Add quic sniffer

* Fix quic sniffer

* Add uTP sniffer

* rename buf pool membership status to unmanaged

* rename buf type adaptor into FromBytes

Co-authored-by: 世界 <i@sekai.icu>
Co-authored-by: Shelikhoo <xiaokangwang@outlook.com>
This commit is contained in:
yuhan6665 2022-05-22 23:48:10 -04:00 committed by GitHub
parent f046feb9ca
commit 3f64f3206c
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
10 changed files with 404 additions and 54 deletions
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56
app/dispatcher/default.go
View file

@ -250,6 +250,9 @@ func (d *DefaultDispatcher) getLink(ctx context.Context, network net.Network, sn
func (d *DefaultDispatcher) shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
domain := result.Domain()
if domain == "" {
return false
}
for _, d := range request.ExcludeForDomain {
if strings.ToLower(domain) == d {
return false
@ -295,33 +298,15 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
sniffingRequest := content.SniffingRequest
inbound, outbound := d.getLink(ctx, destination.Network, sniffingRequest)
switch {
case !sniffingRequest.Enabled:
if !sniffingRequest.Enabled {
go d.routedDispatch(ctx, outbound, destination)
case destination.Network != net.Network_TCP:
// Only metadata sniff will be used for non tcp connection
result, err := sniffer(ctx, nil, true)
if err == nil {
content.Protocol = result.Protocol()
if d.shouldOverride(ctx, result, sniffingRequest, destination) {
domain := result.Domain()
newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
destination.Address = net.ParseAddress(domain)
if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
ob.RouteTarget = destination
} else {
ob.Target = destination
}
}
}
go d.routedDispatch(ctx, outbound, destination)
default:
} else {
go func() {
cReader := &cachedReader{
reader: outbound.Reader.(*pipe.Reader),
}
outbound.Reader = cReader
result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)
if err == nil {
content.Protocol = result.Protocol()
}
@ -356,33 +341,15 @@ func (d *DefaultDispatcher) DispatchLink(ctx context.Context, destination net.De
ctx = session.ContextWithContent(ctx, content)
}
sniffingRequest := content.SniffingRequest
switch {
case !sniffingRequest.Enabled:
if !sniffingRequest.Enabled {
go d.routedDispatch(ctx, outbound, destination)
case destination.Network != net.Network_TCP:
// Only metadata sniff will be used for non tcp connection
result, err := sniffer(ctx, nil, true)
if err == nil {
content.Protocol = result.Protocol()
if d.shouldOverride(ctx, result, sniffingRequest, destination) {
domain := result.Domain()
newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
destination.Address = net.ParseAddress(domain)
if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
ob.RouteTarget = destination
} else {
ob.Target = destination
}
}
}
go d.routedDispatch(ctx, outbound, destination)
default:
} else {
go func() {
cReader := &cachedReader{
reader: outbound.Reader.(*pipe.Reader),
}
outbound.Reader = cReader
result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)
if err == nil {
content.Protocol = result.Protocol()
}
@ -399,10 +366,11 @@ func (d *DefaultDispatcher) DispatchLink(ctx context.Context, destination net.De
d.routedDispatch(ctx, outbound, destination)
}()
}
return nil
}
func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (SniffResult, error) {
func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool, network net.Network) (SniffResult, error) {
payload := buf.New()
defer payload.Release()
@ -428,7 +396,7 @@ func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (Sni
cReader.Cache(payload)
if !payload.IsEmpty() {
result, err := sniffer.Sniff(ctx, payload.Bytes())
result, err := sniffer.Sniff(ctx, payload.Bytes(), network)
if err != common.ErrNoClue {
return result, err
}

15
app/dispatcher/sniffer.go
View file

@ -2,6 +2,8 @@ package dispatcher
import (
"context"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/protocol/quic"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/protocol/bittorrent"
@ -22,6 +24,7 @@ type protocolSnifferWithMetadata struct {
// for both TCP and UDP connections
// It will not be shown as a traffic type for routing unless there is no other successful sniffing.
metadataSniffer bool
network net.Network
}
type Sniffer struct {
@ -31,9 +34,11 @@ type Sniffer struct {
func NewSniffer(ctx context.Context) *Sniffer {
ret := &Sniffer{
sniffer: []protocolSnifferWithMetadata{
{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false},
{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false},
{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false},
{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false, net.Network_TCP},
{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false, net.Network_TCP},
{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false, net.Network_TCP},
{func(c context.Context, b []byte) (SniffResult, error) { return quic.SniffQUIC(b) }, false, net.Network_UDP},
{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffUTP(b) }, false, net.Network_UDP},
},
}
if sniffer, err := newFakeDNSSniffer(ctx); err == nil {
@ -49,11 +54,11 @@ func NewSniffer(ctx context.Context) *Sniffer {
var errUnknownContent = newError("unknown content")
func (s *Sniffer) Sniff(c context.Context, payload []byte) (SniffResult, error) {
func (s *Sniffer) Sniff(c context.Context, payload []byte, network net.Network) (SniffResult, error) {
var pendingSniffer []protocolSnifferWithMetadata
for _, si := range s.sniffer {
s := si.protocolSniffer
if si.metadataSniffer {
if si.metadataSniffer || si.network != network {
continue
}
result, err := s(c, payload)

43
common/buf/buffer.go
View file

@ -18,10 +18,11 @@ var pool = bytespool.GetPool(Size)
// the buffer into an internal buffer pool, in order to recreate a buffer more
// quickly.
type Buffer struct {
v []byte
start int32
end int32
UDP *net.Destination
v []byte
start int32
end int32
unmanaged bool
UDP *net.Destination
}
// New creates a Buffer with 0 length and 8K capacity.
@ -38,6 +39,7 @@ func New() *Buffer {
}
}
// NewExisted creates a managed, standard size Buffer with an existed bytearray
func NewExisted(b []byte) *Buffer {
if cap(b) < Size {
panic("Invalid buffer")
@ -54,6 +56,15 @@ func NewExisted(b []byte) *Buffer {
}
}
// FromBytes creates a Buffer with an existed bytearray
func FromBytes(b []byte) *Buffer {
return &Buffer{
v: b,
end: int32(len(b)),
unmanaged: true,
}
}
// StackNew creates a new Buffer object on stack.
// This method is for buffers that is released in the same function.
func StackNew() Buffer {
@ -71,7 +82,7 @@ func StackNew() Buffer {
// Release recycles the buffer into an internal buffer pool.
func (b *Buffer) Release() {
if b == nil || b.v == nil {
if b == nil || b.v == nil || b.unmanaged {
return
}
@ -212,6 +223,28 @@ func (b *Buffer) WriteString(s string) (int, error) {
return b.Write([]byte(s))
}
// ReadByte implements io.ByteReader
func (b *Buffer) ReadByte() (byte, error) {
if b.start == b.end {
return 0, io.EOF
}
nb := b.v[b.start]
b.start++
return nb, nil
}
// ReadBytes implements bufio.Reader.ReadBytes
func (b *Buffer) ReadBytes(length int32) ([]byte, error) {
if b.end-b.start < length {
return nil, io.EOF
}
nb := b.v[b.start : b.start+length]
b.start += length
return nb, nil
}
// Read implements io.Reader.Read().
func (b *Buffer) Read(data []byte) (int, error) {
if b.Len() == 0 {

59
common/protocol/bittorrent/bittorrent.go
View file

@ -1,8 +1,12 @@
package bittorrent
import (
"encoding/binary"
"errors"
"math"
"time"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common"
)
@ -29,3 +33,58 @@ func SniffBittorrent(b []byte) (*SniffHeader, error) {
return nil, errNotBittorrent
}
func SniffUTP(b []byte) (*SniffHeader, error) {
if len(b) < 20 {
return nil, common.ErrNoClue
}
buffer := buf.FromBytes(b)
var typeAndVersion uint8
if binary.Read(buffer, binary.BigEndian, &typeAndVersion) != nil {
return nil, common.ErrNoClue
} else if b[0]>>4&0xF > 4 || b[0]&0xF != 1 {
return nil, errNotBittorrent
}
var extension uint8
if binary.Read(buffer, binary.BigEndian, &extension) != nil {
return nil, common.ErrNoClue
} else if extension != 0 && extension != 1 {
return nil, errNotBittorrent
}
for extension != 0 {
if extension != 1 {
return nil, errNotBittorrent
}
if binary.Read(buffer, binary.BigEndian, &extension) != nil {
return nil, common.ErrNoClue
}
var length uint8
if err := binary.Read(buffer, binary.BigEndian, &length); err != nil {
return nil, common.ErrNoClue
}
if common.Error2(buffer.ReadBytes(int32(length))) != nil {
return nil, common.ErrNoClue
}
}
if common.Error2(buffer.ReadBytes(2)) != nil {
return nil, common.ErrNoClue
}
var timestamp uint32
if err := binary.Read(buffer, binary.BigEndian, &timestamp); err != nil {
return nil, common.ErrNoClue
}
if math.Abs(float64(time.Now().UnixMicro()-int64(timestamp))) > float64(24*time.Hour) {
return nil, errNotBittorrent
}
return &SniffHeader{}, nil
}

19
common/protocol/quic/qtls_go116.go Normal file
View file

@ -0,0 +1,19 @@
//go:build go1.16 && !go1.17
// +build go1.16,!go1.17
package quic
import (
"crypto/cipher"
"github.com/marten-seemann/qtls-go1-16"
)
type (
// A CipherSuiteTLS13 is a cipher suite for TLS 1.3
CipherSuiteTLS13 = qtls.CipherSuiteTLS13
)
func AEADAESGCMTLS13(key, fixedNonce []byte) cipher.AEAD {
return qtls.AEADAESGCMTLS13(key, fixedNonce)
}

19
common/protocol/quic/qtls_go117.go Normal file
View file

@ -0,0 +1,19 @@
//go:build go1.17 && !go1.18
// +build go1.17,!go1.18
package quic
import (
"crypto/cipher"
"github.com/marten-seemann/qtls-go1-17"
)
type (
// A CipherSuiteTLS13 is a cipher suite for TLS 1.3
CipherSuiteTLS13 = qtls.CipherSuiteTLS13
)
func AEADAESGCMTLS13(key, fixedNonce []byte) cipher.AEAD {
return qtls.AEADAESGCMTLS13(key, fixedNonce)
}

19
common/protocol/quic/qtls_go118.go Normal file
View file

@ -0,0 +1,19 @@
//go:build go1.18
// +build go1.18
package quic
import (
"crypto/cipher"
"github.com/marten-seemann/qtls-go1-18"
)
type (
// A CipherSuiteTLS13 is a cipher suite for TLS 1.3
CipherSuiteTLS13 = qtls.CipherSuiteTLS13
)
func AEADAESGCMTLS13(key, fixedNonce []byte) cipher.AEAD {
return qtls.AEADAESGCMTLS13(key, fixedNonce)
}

208
common/protocol/quic/sniff.go Normal file
View file

@ -0,0 +1,208 @@
package quic
import (
"crypto"
"crypto/aes"
"crypto/tls"
"encoding/binary"
"io"
"github.com/lucas-clemente/quic-go/quicvarint"
"golang.org/x/crypto/hkdf"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/buf"
"github.com/xtls/xray-core/common/errors"
ptls "github.com/xtls/xray-core/common/protocol/tls"
)
type SniffHeader struct {
domain string
}
func (s SniffHeader) Protocol() string {
return "quic"
}
func (s SniffHeader) Domain() string {
return s.domain
}
const (
versionDraft29 uint32 = 0xff00001d
version1 uint32 = 0x1
)
var (
quicSaltOld = []byte{0xaf, 0xbf, 0xec, 0x28, 0x99, 0x93, 0xd2, 0x4c, 0x9e, 0x97, 0x86, 0xf1, 0x9c, 0x61, 0x11, 0xe0, 0x43, 0x90, 0xa8, 0x99}
quicSalt = []byte{0x38, 0x76, 0x2c, 0xf7, 0xf5, 0x59, 0x34, 0xb3, 0x4d, 0x17, 0x9a, 0xe6, 0xa4, 0xc8, 0x0c, 0xad, 0xcc, 0xbb, 0x7f, 0x0a}
initialSuite = &CipherSuiteTLS13{
ID: tls.TLS_AES_128_GCM_SHA256,
KeyLen: 16,
AEAD: AEADAESGCMTLS13,
Hash: crypto.SHA256,
}
errNotQuic = errors.New("not quic")
errNotQuicInitial = errors.New("not initial packet")
)
func SniffQUIC(b []byte) (*SniffHeader, error) {
buffer := buf.FromBytes(b)
typeByte, err := buffer.ReadByte()
if err != nil {
return nil, errNotQuic
}
isLongHeader := typeByte&0x80 > 0
if !isLongHeader || typeByte&0x40 == 0 {
return nil, errNotQuicInitial
}
vb, err := buffer.ReadBytes(4)
if err != nil {
return nil, errNotQuic
}
versionNumber := binary.BigEndian.Uint32(vb)
if versionNumber != 0 && typeByte&0x40 == 0 {
return nil, errNotQuic
} else if versionNumber != versionDraft29 && versionNumber != version1 {
return nil, errNotQuic
}
if (typeByte&0x30)>>4 != 0x0 {
return nil, errNotQuicInitial
}
var destConnID []byte
if l, err := buffer.ReadByte(); err != nil {
return nil, errNotQuic
} else if destConnID, err = buffer.ReadBytes(int32(l)); err != nil {
return nil, errNotQuic
}
if l, err := buffer.ReadByte(); err != nil {
return nil, errNotQuic
} else if common.Error2(buffer.ReadBytes(int32(l))) != nil {
return nil, errNotQuic
}
tokenLen, err := quicvarint.Read(buffer)
if err != nil || tokenLen > uint64(len(b)) {
return nil, errNotQuic
}
if _, err = buffer.ReadBytes(int32(tokenLen)); err != nil {
return nil, errNotQuic
}
packetLen, err := quicvarint.Read(buffer)
if err != nil {
return nil, errNotQuic
}
hdrLen := len(b) - int(buffer.Len())
origPNBytes := make([]byte, 4)
copy(origPNBytes, b[hdrLen:hdrLen+4])
var salt []byte
if versionNumber == version1 {
salt = quicSalt
} else {
salt = quicSaltOld
}
initialSecret := hkdf.Extract(crypto.SHA256.New, destConnID, salt)
secret := hkdfExpandLabel(crypto.SHA256, initialSecret, []byte{}, "client in", crypto.SHA256.Size())
hpKey := hkdfExpandLabel(initialSuite.Hash, secret, []byte{}, "quic hp", initialSuite.KeyLen)
block, err := aes.NewCipher(hpKey)
if err != nil {
return nil, err
}
cache := buf.New()
defer cache.Release()
mask := cache.Extend(int32(block.BlockSize()))
block.Encrypt(mask, b[hdrLen+4:hdrLen+4+16])
b[0] ^= mask[0] & 0xf
for i := range b[hdrLen : hdrLen+4] {
b[hdrLen+i] ^= mask[i+1]
}
packetNumberLength := b[0]&0x3 + 1
if packetNumberLength != 1 {
return nil, errNotQuicInitial
}
var packetNumber uint32
{
n, err := buffer.ReadByte()
if err != nil {
return nil, err
}
packetNumber = uint32(n)
}
if packetNumber != 0 {
return nil, errNotQuicInitial
}
extHdrLen := hdrLen + int(packetNumberLength)
copy(b[extHdrLen:hdrLen+4], origPNBytes[packetNumberLength:])
data := b[extHdrLen : int(packetLen)+hdrLen]
key := hkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic key", 16)
iv := hkdfExpandLabel(crypto.SHA256, secret, []byte{}, "quic iv", 12)
cipher := AEADAESGCMTLS13(key, iv)
nonce := cache.Extend(int32(cipher.NonceSize()))
binary.BigEndian.PutUint64(nonce[len(nonce)-8:], uint64(packetNumber))
decrypted, err := cipher.Open(b[extHdrLen:extHdrLen], nonce, data, b[:extHdrLen])
if err != nil {
return nil, err
}
buffer = buf.FromBytes(decrypted)
frameType, err := buffer.ReadByte()
if err != nil {
return nil, io.ErrUnexpectedEOF
}
if frameType != 0x6 {
// not crypto frame
return &SniffHeader{domain: ""}, nil
}
if common.Error2(quicvarint.Read(buffer)) != nil {
return nil, io.ErrUnexpectedEOF
}
dataLen, err := quicvarint.Read(buffer)
if err != nil {
return nil, io.ErrUnexpectedEOF
}
if dataLen > uint64(buffer.Len()) {
return nil, io.ErrUnexpectedEOF
}
frameData, err := buffer.ReadBytes(int32(dataLen))
common.Must(err)
tlsHdr := &ptls.SniffHeader{}
err = ptls.ReadClientHello(frameData, tlsHdr)
if err != nil {
return nil, err
}
return &SniffHeader{domain: tlsHdr.Domain()}, nil
}
func hkdfExpandLabel(hash crypto.Hash, secret, context []byte, label string, length int) []byte {
b := make([]byte, 3, 3+6+len(label)+1+len(context))
binary.BigEndian.PutUint16(b, uint16(length))
b[2] = uint8(6 + len(label))
b = append(b, []byte("tls13 ")...)
b = append(b, []byte(label)...)
b = b[:3+6+len(label)+1]
b[3+6+len(label)] = uint8(len(context))
b = append(b, context...)
out := make([]byte, length)
n, err := hkdf.Expand(hash.New, secret, b).Read(out)
if err != nil || n != length {
panic("quic: HKDF-Expand-Label invocation failed unexpectedly")
}
return out
}

18
common/protocol/quic/sniff_test.go Normal file
View file

@ -0,0 +1,18 @@
package quic_test
import (
"encoding/hex"
"testing"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/protocol/quic"
)
func TestSniffQUIC(t *testing.T) {
pkt, err := hex.DecodeString("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")
common.Must(err)
quicHdr, err := quic.SniffQUIC(pkt)
if err != nil || quicHdr.Domain() != "www.google.com" {
t.Error("failed")
}
}

2
infra/conf/xray.go
View file

@ -78,6 +78,8 @@ func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
p = append(p, "http")
case "tls", "https", "ssl":
p = append(p, "tls")
case "quic":
p = append(p, "quic")
case "fakedns":
p = append(p, "fakedns")
case "fakedns+others":