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QUIC sniffer: handle multiple initial packets (#3802)
* QUIC sniffer: handle multiple initial packets Basically copied from Vigilans/v2ray-core@8f33db0 Co-Authored-By: Vigilans <vigilans@foxmail.com> * Remove unnecessary file --------- Co-authored-by: Vigilans <vigilans@foxmail.com>
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7970f240de
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@ -41,8 +41,14 @@ func (r *cachedReader) Cache(b *buf.Buffer) {
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if !mb.IsEmpty() {
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if !mb.IsEmpty() {
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r.cache, _ = buf.MergeMulti(r.cache, mb)
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r.cache, _ = buf.MergeMulti(r.cache, mb)
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}
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}
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cacheLen := r.cache.Len()
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if cacheLen <= b.Cap() {
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b.Clear()
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b.Clear()
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rawBytes := b.Extend(buf.Size)
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} else {
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b.Release()
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*b = *buf.NewWithSize(cacheLen)
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}
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rawBytes := b.Extend(cacheLen)
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n := r.cache.Copy(rawBytes)
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n := r.cache.Copy(rawBytes)
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b.Resize(0, int32(n))
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b.Resize(0, int32(n))
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r.Unlock()
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r.Unlock()
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@ -207,6 +207,21 @@ func (b *Buffer) Len() int32 {
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return b.end - b.start
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return b.end - b.start
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}
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}
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// Cap returns the capacity of the buffer content.
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func (b *Buffer) Cap() int32 {
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if b == nil {
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return 0
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}
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return int32(len(b.v))
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}
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// NewWithSize creates a Buffer with 0 length and capacity with at least the given size.
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func NewWithSize(size int32) *Buffer {
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return &Buffer{
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v: bytespool.Alloc(size),
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}
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}
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// IsEmpty returns true if the buffer is empty.
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// IsEmpty returns true if the buffer is empty.
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func (b *Buffer) IsEmpty() bool {
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func (b *Buffer) IsEmpty() bool {
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return b.Len() == 0
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return b.Len() == 0
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@ -47,11 +47,19 @@ var (
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)
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)
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func SniffQUIC(b []byte) (*SniffHeader, error) {
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func SniffQUIC(b []byte) (*SniffHeader, error) {
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// Crypto data separated across packets
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cryptoLen := 0
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cryptoData := bytespool.Alloc(int32(len(b)))
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defer bytespool.Free(cryptoData)
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// Parse QUIC packets
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for len(b) > 0 {
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buffer := buf.FromBytes(b)
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buffer := buf.FromBytes(b)
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typeByte, err := buffer.ReadByte()
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typeByte, err := buffer.ReadByte()
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if err != nil {
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if err != nil {
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return nil, errNotQuic
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return nil, errNotQuic
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}
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}
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isLongHeader := typeByte&0x80 > 0
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isLongHeader := typeByte&0x80 > 0
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if !isLongHeader || typeByte&0x40 == 0 {
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if !isLongHeader || typeByte&0x40 == 0 {
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return nil, errNotQuicInitial
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return nil, errNotQuicInitial
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@ -63,16 +71,14 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
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}
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}
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versionNumber := binary.BigEndian.Uint32(vb)
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versionNumber := binary.BigEndian.Uint32(vb)
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if versionNumber != 0 && typeByte&0x40 == 0 {
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if versionNumber != 0 && typeByte&0x40 == 0 {
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return nil, errNotQuic
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return nil, errNotQuic
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} else if versionNumber != versionDraft29 && versionNumber != version1 {
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} else if versionNumber != versionDraft29 && versionNumber != version1 {
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return nil, errNotQuic
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return nil, errNotQuic
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}
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}
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if (typeByte&0x30)>>4 != 0x0 {
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packetType := (typeByte & 0x30) >> 4
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return nil, errNotQuicInitial
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isQuicInitial := packetType == 0x0
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}
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var destConnID []byte
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var destConnID []byte
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if l, err := buffer.ReadByte(); err != nil {
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if l, err := buffer.ReadByte(); err != nil {
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@ -102,6 +108,15 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
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}
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}
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hdrLen := len(b) - int(buffer.Len())
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hdrLen := len(b) - int(buffer.Len())
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if len(b) < hdrLen+int(packetLen) {
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return nil, common.ErrNoClue // Not enough data to read as a QUIC packet. QUIC is UDP-based, so this is unlikely to happen.
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}
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restPayload := b[hdrLen+int(packetLen):]
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if !isQuicInitial { // Skip this packet if it's not initial packet
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b = restPayload
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continue
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}
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origPNBytes := make([]byte, 4)
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origPNBytes := make([]byte, 4)
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copy(origPNBytes, b[hdrLen:hdrLen+4])
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copy(origPNBytes, b[hdrLen:hdrLen+4])
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@ -142,10 +157,6 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
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packetNumber = uint32(n)
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packetNumber = uint32(n)
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}
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}
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if packetNumber != 0 && packetNumber != 1 {
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return nil, errNotQuicInitial
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}
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extHdrLen := hdrLen + int(packetNumberLength)
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extHdrLen := hdrLen + int(packetNumberLength)
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copy(b[extHdrLen:hdrLen+4], origPNBytes[packetNumberLength:])
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copy(b[extHdrLen:hdrLen+4], origPNBytes[packetNumberLength:])
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data := b[extHdrLen : int(packetLen)+hdrLen]
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data := b[extHdrLen : int(packetLen)+hdrLen]
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@ -160,10 +171,6 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
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return nil, err
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return nil, err
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}
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}
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buffer = buf.FromBytes(decrypted)
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buffer = buf.FromBytes(decrypted)
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cryptoLen := uint(0)
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cryptoData := bytespool.Alloc(buffer.Len())
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defer bytespool.Free(cryptoData)
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for i := 0; !buffer.IsEmpty(); i++ {
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for i := 0; !buffer.IsEmpty(); i++ {
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frameType := byte(0x0) // Default to PADDING frame
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frameType := byte(0x0) // Default to PADDING frame
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for frameType == 0x0 && !buffer.IsEmpty() {
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for frameType == 0x0 && !buffer.IsEmpty() {
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@ -214,8 +221,14 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
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if err != nil || length > uint64(buffer.Len()) {
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if err != nil || length > uint64(buffer.Len()) {
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return nil, io.ErrUnexpectedEOF
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return nil, io.ErrUnexpectedEOF
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}
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}
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if cryptoLen < uint(offset+length) {
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if cryptoLen < int(offset+length) {
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cryptoLen = uint(offset + length)
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cryptoLen = int(offset + length)
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if len(cryptoData) < cryptoLen {
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newCryptoData := bytespool.Alloc(int32(cryptoLen))
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copy(newCryptoData, cryptoData)
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bytespool.Free(cryptoData)
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cryptoData = newCryptoData
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}
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}
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}
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if _, err := buffer.Read(cryptoData[offset : offset+length]); err != nil { // Field: Crypto Data
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if _, err := buffer.Read(cryptoData[offset : offset+length]); err != nil { // Field: Crypto Data
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return nil, io.ErrUnexpectedEOF
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return nil, io.ErrUnexpectedEOF
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@ -244,9 +257,14 @@ func SniffQUIC(b []byte) (*SniffHeader, error) {
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tlsHdr := &ptls.SniffHeader{}
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tlsHdr := &ptls.SniffHeader{}
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err = ptls.ReadClientHello(cryptoData[:cryptoLen], tlsHdr)
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err = ptls.ReadClientHello(cryptoData[:cryptoLen], tlsHdr)
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if err != nil {
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if err != nil {
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return nil, err
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// The crypto data may have not been fully recovered in current packets,
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// So we continue to sniff rest packets.
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b = restPayload
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continue
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}
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}
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return &SniffHeader{domain: tlsHdr.Domain()}, nil
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return &SniffHeader{domain: tlsHdr.Domain()}, nil
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}
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return nil, common.ErrNoClue
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}
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}
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func hkdfExpandLabel(hash crypto.Hash, secret, context []byte, label string, length int) []byte {
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func hkdfExpandLabel(hash crypto.Hash, secret, context []byte, label string, length int) []byte {
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