mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-09 11:51:02 -05:00
268 lines
9.2 KiB
Go
268 lines
9.2 KiB
Go
package encoding
|
|
|
|
import (
|
|
"crypto/md5"
|
|
"crypto/rand"
|
|
"encoding/binary"
|
|
"hash"
|
|
"hash/fnv"
|
|
"io"
|
|
|
|
"golang.org/x/crypto/chacha20poly1305"
|
|
|
|
"v2ray.com/core/common"
|
|
"v2ray.com/core/common/bitmask"
|
|
"v2ray.com/core/common/buf"
|
|
"v2ray.com/core/common/crypto"
|
|
"v2ray.com/core/common/dice"
|
|
"v2ray.com/core/common/protocol"
|
|
"v2ray.com/core/common/serial"
|
|
"v2ray.com/core/proxy/vmess"
|
|
)
|
|
|
|
func hashTimestamp(h hash.Hash, t protocol.Timestamp) []byte {
|
|
serial.WriteUint64(h, uint64(t))
|
|
serial.WriteUint64(h, uint64(t))
|
|
serial.WriteUint64(h, uint64(t))
|
|
serial.WriteUint64(h, uint64(t))
|
|
return h.Sum(nil)
|
|
}
|
|
|
|
// ClientSession stores connection session info for VMess client.
|
|
type ClientSession struct {
|
|
idHash protocol.IDHash
|
|
requestBodyKey [16]byte
|
|
requestBodyIV [16]byte
|
|
responseBodyKey [16]byte
|
|
responseBodyIV [16]byte
|
|
responseReader io.Reader
|
|
responseHeader byte
|
|
}
|
|
|
|
// NewClientSession creates a new ClientSession.
|
|
func NewClientSession(idHash protocol.IDHash) *ClientSession {
|
|
randomBytes := make([]byte, 33) // 16 + 16 + 1
|
|
common.Must2(rand.Read(randomBytes))
|
|
|
|
session := &ClientSession{}
|
|
copy(session.requestBodyKey[:], randomBytes[:16])
|
|
copy(session.requestBodyIV[:], randomBytes[16:32])
|
|
session.responseHeader = randomBytes[32]
|
|
session.responseBodyKey = md5.Sum(session.requestBodyKey[:])
|
|
session.responseBodyIV = md5.Sum(session.requestBodyIV[:])
|
|
session.idHash = idHash
|
|
|
|
return session
|
|
}
|
|
|
|
func (c *ClientSession) EncodeRequestHeader(header *protocol.RequestHeader, writer io.Writer) error {
|
|
timestamp := protocol.NewTimestampGenerator(protocol.NowTime(), 30)()
|
|
account := header.User.Account.(*vmess.MemoryAccount)
|
|
idHash := c.idHash(account.AnyValidID().Bytes())
|
|
common.Must2(serial.WriteUint64(idHash, uint64(timestamp)))
|
|
common.Must2(writer.Write(idHash.Sum(nil)))
|
|
|
|
buffer := buf.New()
|
|
defer buffer.Release()
|
|
|
|
common.Must2(buffer.WriteBytes(Version))
|
|
common.Must2(buffer.Write(c.requestBodyIV[:]))
|
|
common.Must2(buffer.Write(c.requestBodyKey[:]))
|
|
common.Must2(buffer.WriteBytes(c.responseHeader, byte(header.Option)))
|
|
|
|
padingLen := dice.Roll(16)
|
|
security := byte(padingLen<<4) | byte(header.Security)
|
|
common.Must2(buffer.WriteBytes(security, byte(0), byte(header.Command)))
|
|
|
|
if header.Command != protocol.RequestCommandMux {
|
|
if err := addrParser.WriteAddressPort(buffer, header.Address, header.Port); err != nil {
|
|
return newError("failed to writer address and port").Base(err)
|
|
}
|
|
}
|
|
|
|
if padingLen > 0 {
|
|
common.Must2(buffer.ReadFullFrom(rand.Reader, int32(padingLen)))
|
|
}
|
|
|
|
{
|
|
fnv1a := fnv.New32a()
|
|
common.Must2(fnv1a.Write(buffer.Bytes()))
|
|
hashBytes := buffer.Extend(int32(fnv1a.Size()))
|
|
fnv1a.Sum(hashBytes[:0])
|
|
}
|
|
|
|
iv := hashTimestamp(md5.New(), timestamp)
|
|
aesStream := crypto.NewAesEncryptionStream(account.ID.CmdKey(), iv[:])
|
|
aesStream.XORKeyStream(buffer.Bytes(), buffer.Bytes())
|
|
common.Must2(writer.Write(buffer.Bytes()))
|
|
return nil
|
|
}
|
|
|
|
func (c *ClientSession) EncodeRequestBody(request *protocol.RequestHeader, writer io.Writer) buf.Writer {
|
|
var sizeParser crypto.ChunkSizeEncoder = crypto.PlainChunkSizeParser{}
|
|
if request.Option.Has(protocol.RequestOptionChunkMasking) {
|
|
sizeParser = NewShakeSizeParser(c.requestBodyIV[:])
|
|
}
|
|
var padding crypto.PaddingLengthGenerator
|
|
if request.Option.Has(protocol.RequestOptionGlobalPadding) {
|
|
padding = sizeParser.(crypto.PaddingLengthGenerator)
|
|
}
|
|
|
|
switch request.Security {
|
|
case protocol.SecurityType_NONE:
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) {
|
|
if request.Command.TransferType() == protocol.TransferTypeStream {
|
|
return crypto.NewChunkStreamWriter(sizeParser, writer)
|
|
}
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: new(NoOpAuthenticator),
|
|
NonceGenerator: crypto.GenerateEmptyBytes(),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, protocol.TransferTypePacket, padding)
|
|
}
|
|
|
|
return buf.NewWriter(writer)
|
|
case protocol.SecurityType_LEGACY:
|
|
aesStream := crypto.NewAesEncryptionStream(c.requestBodyKey[:], c.requestBodyIV[:])
|
|
cryptionWriter := crypto.NewCryptionWriter(aesStream, writer)
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) {
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: new(FnvAuthenticator),
|
|
NonceGenerator: crypto.GenerateEmptyBytes(),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationWriter(auth, sizeParser, cryptionWriter, request.Command.TransferType(), padding)
|
|
}
|
|
|
|
return &buf.SequentialWriter{Writer: cryptionWriter}
|
|
case protocol.SecurityType_AES128_GCM:
|
|
aead := crypto.NewAesGcm(c.requestBodyKey[:])
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: aead,
|
|
NonceGenerator: GenerateChunkNonce(c.requestBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding)
|
|
case protocol.SecurityType_CHACHA20_POLY1305:
|
|
aead, err := chacha20poly1305.New(GenerateChacha20Poly1305Key(c.requestBodyKey[:]))
|
|
common.Must(err)
|
|
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: aead,
|
|
NonceGenerator: GenerateChunkNonce(c.requestBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding)
|
|
default:
|
|
panic("Unknown security type.")
|
|
}
|
|
}
|
|
|
|
func (c *ClientSession) DecodeResponseHeader(reader io.Reader) (*protocol.ResponseHeader, error) {
|
|
aesStream := crypto.NewAesDecryptionStream(c.responseBodyKey[:], c.responseBodyIV[:])
|
|
c.responseReader = crypto.NewCryptionReader(aesStream, reader)
|
|
|
|
buffer := buf.New()
|
|
defer buffer.Release()
|
|
|
|
if _, err := buffer.ReadFullFrom(c.responseReader, 4); err != nil {
|
|
return nil, newError("failed to read response header").Base(err)
|
|
}
|
|
|
|
if buffer.Byte(0) != c.responseHeader {
|
|
return nil, newError("unexpected response header. Expecting ", int(c.responseHeader), " but actually ", int(buffer.Byte(0)))
|
|
}
|
|
|
|
header := &protocol.ResponseHeader{
|
|
Option: bitmask.Byte(buffer.Byte(1)),
|
|
}
|
|
|
|
if buffer.Byte(2) != 0 {
|
|
cmdID := buffer.Byte(2)
|
|
dataLen := int32(buffer.Byte(3))
|
|
|
|
buffer.Clear()
|
|
if _, err := buffer.ReadFullFrom(c.responseReader, dataLen); err != nil {
|
|
return nil, newError("failed to read response command").Base(err)
|
|
}
|
|
command, err := UnmarshalCommand(cmdID, buffer.Bytes())
|
|
if err == nil {
|
|
header.Command = command
|
|
}
|
|
}
|
|
|
|
return header, nil
|
|
}
|
|
|
|
func (c *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, reader io.Reader) buf.Reader {
|
|
var sizeParser crypto.ChunkSizeDecoder = crypto.PlainChunkSizeParser{}
|
|
if request.Option.Has(protocol.RequestOptionChunkMasking) {
|
|
sizeParser = NewShakeSizeParser(c.responseBodyIV[:])
|
|
}
|
|
var padding crypto.PaddingLengthGenerator
|
|
if request.Option.Has(protocol.RequestOptionGlobalPadding) {
|
|
padding = sizeParser.(crypto.PaddingLengthGenerator)
|
|
}
|
|
|
|
switch request.Security {
|
|
case protocol.SecurityType_NONE:
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) {
|
|
if request.Command.TransferType() == protocol.TransferTypeStream {
|
|
return crypto.NewChunkStreamReader(sizeParser, reader)
|
|
}
|
|
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: new(NoOpAuthenticator),
|
|
NonceGenerator: crypto.GenerateEmptyBytes(),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
|
|
return crypto.NewAuthenticationReader(auth, sizeParser, reader, protocol.TransferTypePacket, padding)
|
|
}
|
|
|
|
return buf.NewReader(reader)
|
|
case protocol.SecurityType_LEGACY:
|
|
if request.Option.Has(protocol.RequestOptionChunkStream) {
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: new(FnvAuthenticator),
|
|
NonceGenerator: crypto.GenerateEmptyBytes(),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationReader(auth, sizeParser, c.responseReader, request.Command.TransferType(), padding)
|
|
}
|
|
|
|
return buf.NewReader(c.responseReader)
|
|
case protocol.SecurityType_AES128_GCM:
|
|
aead := crypto.NewAesGcm(c.responseBodyKey[:])
|
|
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: aead,
|
|
NonceGenerator: GenerateChunkNonce(c.responseBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding)
|
|
case protocol.SecurityType_CHACHA20_POLY1305:
|
|
aead, _ := chacha20poly1305.New(GenerateChacha20Poly1305Key(c.responseBodyKey[:]))
|
|
|
|
auth := &crypto.AEADAuthenticator{
|
|
AEAD: aead,
|
|
NonceGenerator: GenerateChunkNonce(c.responseBodyIV[:], uint32(aead.NonceSize())),
|
|
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
|
|
}
|
|
return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding)
|
|
default:
|
|
panic("Unknown security type.")
|
|
}
|
|
}
|
|
|
|
func GenerateChunkNonce(nonce []byte, size uint32) crypto.BytesGenerator {
|
|
c := append([]byte(nil), nonce...)
|
|
count := uint16(0)
|
|
return func() []byte {
|
|
binary.BigEndian.PutUint16(c, count)
|
|
count++
|
|
return c[:size]
|
|
}
|
|
}
|