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Fix DoS attack vulnerability in VMess Option Processing

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This commit is contained in:
Shelikhoo 2022-06-12 23:29:09 +01:00 • committed by yuhan6665
parent ba4ce4c24f
commit d4f18b1342
4 changed files with 72 additions and 45 deletions
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48
proxy/vmess/encoding/client.go
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@ -136,31 +136,35 @@ func (c *ClientSession) EncodeRequestHeader(header *protocol.RequestHeader, writ
return nil
}
func (c *ClientSession) EncodeRequestBody(request *protocol.RequestHeader, writer io.Writer) buf.Writer {
func (c *ClientSession) EncodeRequestBody(request *protocol.RequestHeader, writer io.Writer) (buf.Writer, error) {
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)
var ok bool
padding, ok = sizeParser.(crypto.PaddingLengthGenerator)
if !ok {
return nil, newError("invalid option: RequestOptionGlobalPadding")
}
}
switch request.Security {
case protocol.SecurityType_NONE:
if request.Option.Has(protocol.RequestOptionChunkStream) {
if request.Command.TransferType() == protocol.TransferTypeStream {
return crypto.NewChunkStreamWriter(sizeParser, writer)
return crypto.NewChunkStreamWriter(sizeParser, writer), nil
}
auth := &crypto.AEADAuthenticator{
AEAD: new(NoOpAuthenticator),
NonceGenerator: crypto.GenerateEmptyBytes(),
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
}
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, protocol.TransferTypePacket, padding)
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, protocol.TransferTypePacket, padding), nil
}
return buf.NewWriter(writer)
return buf.NewWriter(writer), nil
case protocol.SecurityType_LEGACY:
aesStream := crypto.NewAesEncryptionStream(c.requestBodyKey[:], c.requestBodyIV[:])
cryptionWriter := crypto.NewCryptionWriter(aesStream, writer)
@ -170,10 +174,10 @@ func (c *ClientSession) EncodeRequestBody(request *protocol.RequestHeader, write
NonceGenerator: crypto.GenerateEmptyBytes(),
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
}
return crypto.NewAuthenticationWriter(auth, sizeParser, cryptionWriter, request.Command.TransferType(), padding)
return crypto.NewAuthenticationWriter(auth, sizeParser, cryptionWriter, request.Command.TransferType(), padding), nil
}
return &buf.SequentialWriter{Writer: cryptionWriter}
return &buf.SequentialWriter{Writer: cryptionWriter}, nil
case protocol.SecurityType_AES128_GCM:
aead := crypto.NewAesGcm(c.requestBodyKey[:])
auth := &crypto.AEADAuthenticator{
@ -192,7 +196,7 @@ func (c *ClientSession) EncodeRequestBody(request *protocol.RequestHeader, write
}
sizeParser = NewAEADSizeParser(lengthAuth)
}
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding)
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding), nil
case protocol.SecurityType_CHACHA20_POLY1305:
aead, err := chacha20poly1305.New(GenerateChacha20Poly1305Key(c.requestBodyKey[:]))
common.Must(err)
@ -214,9 +218,9 @@ func (c *ClientSession) EncodeRequestBody(request *protocol.RequestHeader, write
}
sizeParser = NewAEADSizeParser(lengthAuth)
}
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding)
return crypto.NewAuthenticationWriter(auth, sizeParser, writer, request.Command.TransferType(), padding), nil
default:
panic("Unknown security type.")
return nil, newError("invalid option: Security")
}
}
@ -305,21 +309,25 @@ func (c *ClientSession) DecodeResponseHeader(reader io.Reader) (*protocol.Respon
return header, nil
}
func (c *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, reader io.Reader) buf.Reader {
func (c *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, reader io.Reader) (buf.Reader, error) {
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)
var ok bool
padding, ok = sizeParser.(crypto.PaddingLengthGenerator)
if !ok {
return nil, newError("invalid option: RequestOptionGlobalPadding")
}
}
switch request.Security {
case protocol.SecurityType_NONE:
if request.Option.Has(protocol.RequestOptionChunkStream) {
if request.Command.TransferType() == protocol.TransferTypeStream {
return crypto.NewChunkStreamReader(sizeParser, reader)
return crypto.NewChunkStreamReader(sizeParser, reader), nil
}
auth := &crypto.AEADAuthenticator{
@ -328,10 +336,10 @@ func (c *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, read
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
}
return crypto.NewAuthenticationReader(auth, sizeParser, reader, protocol.TransferTypePacket, padding)
return crypto.NewAuthenticationReader(auth, sizeParser, reader, protocol.TransferTypePacket, padding), nil
}
return buf.NewReader(reader)
return buf.NewReader(reader), nil
case protocol.SecurityType_LEGACY:
if request.Option.Has(protocol.RequestOptionChunkStream) {
auth := &crypto.AEADAuthenticator{
@ -339,10 +347,10 @@ func (c *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, read
NonceGenerator: crypto.GenerateEmptyBytes(),
AdditionalDataGenerator: crypto.GenerateEmptyBytes(),
}
return crypto.NewAuthenticationReader(auth, sizeParser, c.responseReader, request.Command.TransferType(), padding)
return crypto.NewAuthenticationReader(auth, sizeParser, c.responseReader, request.Command.TransferType(), padding), nil
}
return buf.NewReader(c.responseReader)
return buf.NewReader(c.responseReader), nil
case protocol.SecurityType_AES128_GCM:
aead := crypto.NewAesGcm(c.responseBodyKey[:])
@ -362,7 +370,7 @@ func (c *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, read
}
sizeParser = NewAEADSizeParser(lengthAuth)
}
return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding)
return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding), nil
case protocol.SecurityType_CHACHA20_POLY1305:
aead, _ := chacha20poly1305.New(GenerateChacha20Poly1305Key(c.responseBodyKey[:]))
@ -383,9 +391,9 @@ func (c *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, read
}
sizeParser = NewAEADSizeParser(lengthAuth)
}
return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding)
return crypto.NewAuthenticationReader(auth, sizeParser, reader, request.Command.TransferType(), padding), nil
default:
panic("Unknown security type.")
return nil, newError("invalid option: Security")
}
}