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269 lines
9.2 KiB
269 lines
9.2 KiB
package encoding
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import (
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"crypto/md5"
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"crypto/rand"
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"encoding/binary"
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"hash"
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"hash/fnv"
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"io"
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"golang.org/x/crypto/chacha20poly1305"
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"v2ray.com/core/common"
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"v2ray.com/core/common/bitmask"
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"v2ray.com/core/common/buf"
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"v2ray.com/core/common/crypto"
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"v2ray.com/core/common/dice"
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"v2ray.com/core/common/protocol"
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"v2ray.com/core/common/serial"
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"v2ray.com/core/proxy/vmess"
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)
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func hashTimestamp(h hash.Hash, t protocol.Timestamp) []byte {
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common.Must2(serial.WriteUint64(h, uint64(t)))
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common.Must2(serial.WriteUint64(h, uint64(t)))
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common.Must2(serial.WriteUint64(h, uint64(t)))
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common.Must2(serial.WriteUint64(h, uint64(t)))
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return h.Sum(nil)
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}
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// ClientSession stores connection session info for VMess client.
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type ClientSession struct {
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idHash protocol.IDHash
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requestBodyKey [16]byte
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requestBodyIV [16]byte
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responseBodyKey [16]byte
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responseBodyIV [16]byte
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responseReader io.Reader
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responseHeader byte
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}
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// NewClientSession creates a new ClientSession.
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func NewClientSession(idHash protocol.IDHash) *ClientSession {
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randomBytes := make([]byte, 33) // 16 + 16 + 1
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common.Must2(rand.Read(randomBytes))
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session := &ClientSession{}
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copy(session.requestBodyKey[:], randomBytes[:16])
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copy(session.requestBodyIV[:], randomBytes[16:32])
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session.responseHeader = randomBytes[32]
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session.responseBodyKey = md5.Sum(session.requestBodyKey[:])
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session.responseBodyIV = md5.Sum(session.requestBodyIV[:])
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session.idHash = idHash
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return session
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}
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func (c *ClientSession) EncodeRequestHeader(header *protocol.RequestHeader, writer io.Writer) error {
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timestamp := protocol.NewTimestampGenerator(protocol.NowTime(), 30)()
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account := header.User.Account.(*vmess.MemoryAccount)
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idHash := c.idHash(account.AnyValidID().Bytes())
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common.Must2(serial.WriteUint64(idHash, uint64(timestamp)))
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common.Must2(writer.Write(idHash.Sum(nil)))
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buffer := buf.New()
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defer buffer.Release()
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common.Must(buffer.WriteByte(Version))
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common.Must2(buffer.Write(c.requestBodyIV[:]))
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common.Must2(buffer.Write(c.requestBodyKey[:]))
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common.Must(buffer.WriteByte(c.responseHeader))
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common.Must(buffer.WriteByte(byte(header.Option)))
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padingLen := dice.Roll(16)
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security := byte(padingLen<<4) | byte(header.Security)
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common.Must2(buffer.Write([]byte{security, byte(0), byte(header.Command)}))
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if header.Command != protocol.RequestCommandMux {
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if err := addrParser.WriteAddressPort(buffer, header.Address, header.Port); err != nil {
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return newError("failed to writer address and port").Base(err)
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}
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}
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if padingLen > 0 {
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common.Must2(buffer.ReadFullFrom(rand.Reader, int32(padingLen)))
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}
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{
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fnv1a := fnv.New32a()
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common.Must2(fnv1a.Write(buffer.Bytes()))
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hashBytes := buffer.Extend(int32(fnv1a.Size()))
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fnv1a.Sum(hashBytes[:0])
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}
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iv := hashTimestamp(md5.New(), timestamp)
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aesStream := crypto.NewAesEncryptionStream(account.ID.CmdKey(), iv[:])
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aesStream.XORKeyStream(buffer.Bytes(), buffer.Bytes())
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common.Must2(writer.Write(buffer.Bytes()))
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return nil
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}
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func (c *ClientSession) EncodeRequestBody(request *protocol.RequestHeader, writer io.Writer) buf.Writer {
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var sizeParser crypto.ChunkSizeEncoder = crypto.PlainChunkSizeParser{}
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if request.Option.Has(protocol.RequestOptionChunkMasking) {
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sizeParser = NewShakeSizeParser(c.requestBodyIV[:])
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}
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var padding crypto.PaddingLengthGenerator
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if request.Option.Has(protocol.RequestOptionGlobalPadding) {
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padding = sizeParser.(crypto.PaddingLengthGenerator)
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}
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switch request.Security {
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case protocol.SecurityType_NONE:
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if request.Option.Has(protocol.RequestOptionChunkStream) {
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if request.Command.TransferType() == protocol.TransferTypeStream {
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return crypto.NewChunkStreamWriter(sizeParser, writer)
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}
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auth := &crypto.AEADAuthenticator{
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AEAD: new(NoOpAuthenticator),
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NonceGenerator: crypto.GenerateEmptyBytes(),
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AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
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}
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return crypto.NewAuthenticationWriter(auth, sizeParser, writer, protocol.TransferTypePacket, padding)
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}
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return buf.NewWriter(writer)
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case protocol.SecurityType_LEGACY:
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aesStream := crypto.NewAesEncryptionStream(c.requestBodyKey[:], c.requestBodyIV[:])
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cryptionWriter := crypto.NewCryptionWriter(aesStream, writer)
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if request.Option.Has(protocol.RequestOptionChunkStream) {
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auth := &crypto.AEADAuthenticator{
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AEAD: new(FnvAuthenticator),
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NonceGenerator: crypto.GenerateEmptyBytes(),
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AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
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}
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return crypto.NewAuthenticationWriter(auth, sizeParser, cryptionWriter, request.Command.TransferType(), padding)
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}
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return &buf.SequentialWriter{Writer: cryptionWriter}
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case protocol.SecurityType_AES128_GCM:
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aead := crypto.NewAesGcm(c.requestBodyKey[:])
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auth := &crypto.AEADAuthenticator{
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AEAD: aead,
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NonceGenerator: GenerateChunkNonce(c.requestBodyIV[:], uint32(aead.NonceSize())),
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AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
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}
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return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding)
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case protocol.SecurityType_CHACHA20_POLY1305:
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aead, err := chacha20poly1305.New(GenerateChacha20Poly1305Key(c.requestBodyKey[:]))
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common.Must(err)
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auth := &crypto.AEADAuthenticator{
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AEAD: aead,
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NonceGenerator: GenerateChunkNonce(c.requestBodyIV[:], uint32(aead.NonceSize())),
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AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
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}
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return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding)
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default:
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panic("Unknown security type.")
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}
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}
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func (c *ClientSession) DecodeResponseHeader(reader io.Reader) (*protocol.ResponseHeader, error) {
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aesStream := crypto.NewAesDecryptionStream(c.responseBodyKey[:], c.responseBodyIV[:])
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c.responseReader = crypto.NewCryptionReader(aesStream, reader)
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buffer := buf.StackNew()
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defer buffer.Release()
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if _, err := buffer.ReadFullFrom(c.responseReader, 4); err != nil {
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return nil, newError("failed to read response header").Base(err)
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}
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if buffer.Byte(0) != c.responseHeader {
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return nil, newError("unexpected response header. Expecting ", int(c.responseHeader), " but actually ", int(buffer.Byte(0)))
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}
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header := &protocol.ResponseHeader{
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Option: bitmask.Byte(buffer.Byte(1)),
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}
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if buffer.Byte(2) != 0 {
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cmdID := buffer.Byte(2)
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dataLen := int32(buffer.Byte(3))
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buffer.Clear()
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if _, err := buffer.ReadFullFrom(c.responseReader, dataLen); err != nil {
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return nil, newError("failed to read response command").Base(err)
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}
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command, err := UnmarshalCommand(cmdID, buffer.Bytes())
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if err == nil {
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header.Command = command
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}
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}
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return header, nil
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}
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func (c *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, reader io.Reader) buf.Reader {
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var sizeParser crypto.ChunkSizeDecoder = crypto.PlainChunkSizeParser{}
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if request.Option.Has(protocol.RequestOptionChunkMasking) {
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sizeParser = NewShakeSizeParser(c.responseBodyIV[:])
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}
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var padding crypto.PaddingLengthGenerator
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if request.Option.Has(protocol.RequestOptionGlobalPadding) {
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padding = sizeParser.(crypto.PaddingLengthGenerator)
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}
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switch request.Security {
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case protocol.SecurityType_NONE:
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if request.Option.Has(protocol.RequestOptionChunkStream) {
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if request.Command.TransferType() == protocol.TransferTypeStream {
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return crypto.NewChunkStreamReader(sizeParser, reader)
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}
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auth := &crypto.AEADAuthenticator{
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AEAD: new(NoOpAuthenticator),
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NonceGenerator: crypto.GenerateEmptyBytes(),
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AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
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}
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return crypto.NewAuthenticationReader(auth, sizeParser, reader, protocol.TransferTypePacket, padding)
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}
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return buf.NewReader(reader)
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case protocol.SecurityType_LEGACY:
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if request.Option.Has(protocol.RequestOptionChunkStream) {
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auth := &crypto.AEADAuthenticator{
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AEAD: new(FnvAuthenticator),
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NonceGenerator: crypto.GenerateEmptyBytes(),
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AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
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}
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return crypto.NewAuthenticationReader(auth, sizeParser, c.responseReader, request.Command.TransferType(), padding)
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}
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return buf.NewReader(c.responseReader)
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case protocol.SecurityType_AES128_GCM:
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aead := crypto.NewAesGcm(c.responseBodyKey[:])
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auth := &crypto.AEADAuthenticator{
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AEAD: aead,
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NonceGenerator: GenerateChunkNonce(c.responseBodyIV[:], uint32(aead.NonceSize())),
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AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
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}
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return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding)
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case protocol.SecurityType_CHACHA20_POLY1305:
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aead, _ := chacha20poly1305.New(GenerateChacha20Poly1305Key(c.responseBodyKey[:]))
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auth := &crypto.AEADAuthenticator{
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AEAD: aead,
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NonceGenerator: GenerateChunkNonce(c.responseBodyIV[:], uint32(aead.NonceSize())),
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AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
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}
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return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding)
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default:
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panic("Unknown security type.")
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}
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}
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func GenerateChunkNonce(nonce []byte, size uint32) crypto.BytesGenerator {
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c := append([]byte(nil), nonce...)
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count := uint16(0)
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return func() []byte {
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binary.BigEndian.PutUint16(c, count)
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count++
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return c[:size]
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}
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}
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