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345 lines
14 KiB
345 lines
14 KiB
package encoding
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import (
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"bytes"
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"context"
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"crypto/aes"
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"crypto/cipher"
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"crypto/rand"
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"crypto/sha256"
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"encoding/binary"
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"hash/fnv"
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"io"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/bitmask"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/crypto"
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"github.com/xtls/xray-core/common/dice"
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"github.com/xtls/xray-core/common/drain"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/protocol"
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"github.com/xtls/xray-core/proxy/vmess"
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vmessaead "github.com/xtls/xray-core/proxy/vmess/aead"
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"golang.org/x/crypto/chacha20poly1305"
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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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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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readDrainer drain.Drainer
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}
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// NewClientSession creates a new ClientSession.
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func NewClientSession(ctx context.Context, behaviorSeed int64) *ClientSession {
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session := &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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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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BodyKey := sha256.Sum256(session.requestBodyKey[:])
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copy(session.responseBodyKey[:], BodyKey[:16])
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BodyIV := sha256.Sum256(session.requestBodyIV[:])
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copy(session.responseBodyIV[:], BodyIV[:16])
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{
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var err error
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session.readDrainer, err = drain.NewBehaviorSeedLimitedDrainer(behaviorSeed, 18, 3266, 64)
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if err != nil {
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errors.LogInfoInner(ctx, err, "unable to initialize drainer")
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session.readDrainer = drain.NewNopDrainer()
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}
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}
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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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account := header.User.Account.(*vmess.MemoryAccount)
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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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paddingLen := dice.Roll(16)
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security := byte(paddingLen<<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 errors.New("failed to writer address and port").Base(err)
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}
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}
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if paddingLen > 0 {
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common.Must2(buffer.ReadFullFrom(rand.Reader, int32(paddingLen)))
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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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var fixedLengthCmdKey [16]byte
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copy(fixedLengthCmdKey[:], account.ID.CmdKey())
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vmessout := vmessaead.SealVMessAEADHeader(fixedLengthCmdKey, buffer.Bytes())
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common.Must2(io.Copy(writer, bytes.NewReader(vmessout)))
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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, error) {
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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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var ok bool
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padding, ok = sizeParser.(crypto.PaddingLengthGenerator)
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if !ok {
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return nil, errors.New("invalid option: RequestOptionGlobalPadding")
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}
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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), nil
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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), nil
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}
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return buf.NewWriter(writer), nil
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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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if request.Option.Has(protocol.RequestOptionAuthenticatedLength) {
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AuthenticatedLengthKey := vmessaead.KDF16(c.requestBodyKey[:], "auth_len")
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AuthenticatedLengthKeyAEAD := crypto.NewAesGcm(AuthenticatedLengthKey)
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lengthAuth := &crypto.AEADAuthenticator{
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AEAD: AuthenticatedLengthKeyAEAD,
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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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sizeParser = NewAEADSizeParser(lengthAuth)
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}
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return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding), nil
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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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if request.Option.Has(protocol.RequestOptionAuthenticatedLength) {
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AuthenticatedLengthKey := vmessaead.KDF16(c.requestBodyKey[:], "auth_len")
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AuthenticatedLengthKeyAEAD, err := chacha20poly1305.New(GenerateChacha20Poly1305Key(AuthenticatedLengthKey))
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common.Must(err)
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lengthAuth := &crypto.AEADAuthenticator{
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AEAD: AuthenticatedLengthKeyAEAD,
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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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sizeParser = NewAEADSizeParser(lengthAuth)
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}
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return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding), nil
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default:
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return nil, errors.New("invalid option: Security")
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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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aeadResponseHeaderLengthEncryptionKey := vmessaead.KDF16(c.responseBodyKey[:], vmessaead.KDFSaltConstAEADRespHeaderLenKey)
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aeadResponseHeaderLengthEncryptionIV := vmessaead.KDF(c.responseBodyIV[:], vmessaead.KDFSaltConstAEADRespHeaderLenIV)[:12]
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aeadResponseHeaderLengthEncryptionKeyAESBlock := common.Must2(aes.NewCipher(aeadResponseHeaderLengthEncryptionKey)).(cipher.Block)
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aeadResponseHeaderLengthEncryptionAEAD := common.Must2(cipher.NewGCM(aeadResponseHeaderLengthEncryptionKeyAESBlock)).(cipher.AEAD)
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var aeadEncryptedResponseHeaderLength [18]byte
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var decryptedResponseHeaderLength int
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var decryptedResponseHeaderLengthBinaryDeserializeBuffer uint16
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if n, err := io.ReadFull(reader, aeadEncryptedResponseHeaderLength[:]); err != nil {
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c.readDrainer.AcknowledgeReceive(n)
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return nil, drain.WithError(c.readDrainer, reader, errors.New("Unable to Read Header Len").Base(err))
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} else { // nolint: golint
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c.readDrainer.AcknowledgeReceive(n)
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}
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if decryptedResponseHeaderLengthBinaryBuffer, err := aeadResponseHeaderLengthEncryptionAEAD.Open(nil, aeadResponseHeaderLengthEncryptionIV, aeadEncryptedResponseHeaderLength[:], nil); err != nil {
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return nil, drain.WithError(c.readDrainer, reader, errors.New("Failed To Decrypt Length").Base(err))
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} else { // nolint: golint
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common.Must(binary.Read(bytes.NewReader(decryptedResponseHeaderLengthBinaryBuffer), binary.BigEndian, &decryptedResponseHeaderLengthBinaryDeserializeBuffer))
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decryptedResponseHeaderLength = int(decryptedResponseHeaderLengthBinaryDeserializeBuffer)
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}
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aeadResponseHeaderPayloadEncryptionKey := vmessaead.KDF16(c.responseBodyKey[:], vmessaead.KDFSaltConstAEADRespHeaderPayloadKey)
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aeadResponseHeaderPayloadEncryptionIV := vmessaead.KDF(c.responseBodyIV[:], vmessaead.KDFSaltConstAEADRespHeaderPayloadIV)[:12]
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aeadResponseHeaderPayloadEncryptionKeyAESBlock := common.Must2(aes.NewCipher(aeadResponseHeaderPayloadEncryptionKey)).(cipher.Block)
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aeadResponseHeaderPayloadEncryptionAEAD := common.Must2(cipher.NewGCM(aeadResponseHeaderPayloadEncryptionKeyAESBlock)).(cipher.AEAD)
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encryptedResponseHeaderBuffer := make([]byte, decryptedResponseHeaderLength+16)
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if n, err := io.ReadFull(reader, encryptedResponseHeaderBuffer); err != nil {
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c.readDrainer.AcknowledgeReceive(n)
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return nil, drain.WithError(c.readDrainer, reader, errors.New("Unable to Read Header Data").Base(err))
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} else { // nolint: golint
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c.readDrainer.AcknowledgeReceive(n)
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}
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if decryptedResponseHeaderBuffer, err := aeadResponseHeaderPayloadEncryptionAEAD.Open(nil, aeadResponseHeaderPayloadEncryptionIV, encryptedResponseHeaderBuffer, nil); err != nil {
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return nil, drain.WithError(c.readDrainer, reader, errors.New("Failed To Decrypt Payload").Base(err))
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} else { // nolint: golint
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c.responseReader = bytes.NewReader(decryptedResponseHeaderBuffer)
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}
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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, errors.New("failed to read response header").Base(err).AtWarning()
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}
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if buffer.Byte(0) != c.responseHeader {
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return nil, errors.New("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, errors.New("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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aesStream := crypto.NewAesDecryptionStream(c.responseBodyKey[:], c.responseBodyIV[:])
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c.responseReader = crypto.NewCryptionReader(aesStream, reader)
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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, error) {
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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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var ok bool
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padding, ok = sizeParser.(crypto.PaddingLengthGenerator)
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if !ok {
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return nil, errors.New("invalid option: RequestOptionGlobalPadding")
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}
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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), nil
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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), nil
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}
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return buf.NewReader(reader), nil
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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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if request.Option.Has(protocol.RequestOptionAuthenticatedLength) {
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AuthenticatedLengthKey := vmessaead.KDF16(c.requestBodyKey[:], "auth_len")
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AuthenticatedLengthKeyAEAD := crypto.NewAesGcm(AuthenticatedLengthKey)
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lengthAuth := &crypto.AEADAuthenticator{
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AEAD: AuthenticatedLengthKeyAEAD,
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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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sizeParser = NewAEADSizeParser(lengthAuth)
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}
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return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding), nil
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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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if request.Option.Has(protocol.RequestOptionAuthenticatedLength) {
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AuthenticatedLengthKey := vmessaead.KDF16(c.requestBodyKey[:], "auth_len")
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AuthenticatedLengthKeyAEAD, err := chacha20poly1305.New(GenerateChacha20Poly1305Key(AuthenticatedLengthKey))
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common.Must(err)
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lengthAuth := &crypto.AEADAuthenticator{
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AEAD: AuthenticatedLengthKeyAEAD,
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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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sizeParser = NewAEADSizeParser(lengthAuth)
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}
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return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding), nil
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default:
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return nil, errors.New("invalid option: Security")
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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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