mirror of https://github.com/v2fly/v2ray-core.git
287 lines
8.9 KiB
Go
287 lines
8.9 KiB
Go
package encoding
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/md5"
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"crypto/rand"
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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/app/log"
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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/net"
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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(t protocol.Timestamp) []byte {
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bytes := make([]byte, 0, 32)
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bytes = t.Bytes(bytes)
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bytes = t.Bytes(bytes)
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bytes = t.Bytes(bytes)
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bytes = t.Bytes(bytes)
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return bytes
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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 []byte
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requestBodyIV []byte
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responseHeader byte
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responseBodyKey []byte
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responseBodyIV []byte
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responseReader io.Reader
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idHash protocol.IDHash
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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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rand.Read(randomBytes)
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session := &ClientSession{}
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session.requestBodyKey = randomBytes[:16]
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session.requestBodyIV = randomBytes[16:32]
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session.responseHeader = randomBytes[32]
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responseBodyKey := md5.Sum(session.requestBodyKey)
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responseBodyIV := md5.Sum(session.requestBodyIV)
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session.responseBodyKey = responseBodyKey[:]
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session.responseBodyIV = responseBodyIV[:]
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session.idHash = idHash
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return session
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}
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func (v *ClientSession) EncodeRequestHeader(header *protocol.RequestHeader, writer io.Writer) {
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timestamp := protocol.NewTimestampGenerator(protocol.NowTime(), 30)()
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account, err := header.User.GetTypedAccount()
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if err != nil {
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log.Trace(newError("failed to get user account: ", err).AtError())
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return
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}
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idHash := v.idHash(account.(*vmess.InternalAccount).AnyValidID().Bytes())
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idHash.Write(timestamp.Bytes(nil))
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writer.Write(idHash.Sum(nil))
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buffer := make([]byte, 0, 512)
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buffer = append(buffer, Version)
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buffer = append(buffer, v.requestBodyIV...)
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buffer = append(buffer, v.requestBodyKey...)
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buffer = append(buffer, v.responseHeader, byte(header.Option))
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padingLen := dice.Roll(16)
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if header.Security.Is(protocol.SecurityType_LEGACY) {
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// Disable padding in legacy mode for a smooth transition.
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padingLen = 0
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}
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security := byte(padingLen<<4) | byte(header.Security)
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buffer = append(buffer, security, byte(0), byte(header.Command))
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buffer = header.Port.Bytes(buffer)
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switch header.Address.Family() {
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case net.AddressFamilyIPv4:
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buffer = append(buffer, AddrTypeIPv4)
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buffer = append(buffer, header.Address.IP()...)
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case net.AddressFamilyIPv6:
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buffer = append(buffer, AddrTypeIPv6)
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buffer = append(buffer, header.Address.IP()...)
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case net.AddressFamilyDomain:
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buffer = append(buffer, AddrTypeDomain, byte(len(header.Address.Domain())))
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buffer = append(buffer, header.Address.Domain()...)
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}
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if padingLen > 0 {
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pading := make([]byte, padingLen)
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rand.Read(pading)
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buffer = append(buffer, pading...)
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}
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fnv1a := fnv.New32a()
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fnv1a.Write(buffer)
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buffer = fnv1a.Sum(buffer)
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timestampHash := md5.New()
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timestampHash.Write(hashTimestamp(timestamp))
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iv := timestampHash.Sum(nil)
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aesStream := crypto.NewAesEncryptionStream(account.(*vmess.InternalAccount).ID.CmdKey(), iv)
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aesStream.XORKeyStream(buffer, buffer)
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writer.Write(buffer)
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return
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}
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func (v *ClientSession) EncodeRequestBody(request *protocol.RequestHeader, writer io.Writer) buf.Writer {
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var authWriter io.Writer
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var sizeMask crypto.Uint16Generator = crypto.StaticUint16Generator(0)
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if request.Option.Has(protocol.RequestOptionChunkMasking) {
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sizeMask = getSizeMask(v.requestBodyIV)
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}
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if request.Security.Is(protocol.SecurityType_NONE) {
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if request.Option.Has(protocol.RequestOptionChunkStream) {
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auth := &crypto.AEADAuthenticator{
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AEAD: NoOpAuthenticator{},
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NonceGenerator: crypto.NoOpBytesGenerator{},
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AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
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}
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authWriter = crypto.NewAuthenticationWriter(auth, writer, sizeMask)
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} else {
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authWriter = writer
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}
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} else if request.Security.Is(protocol.SecurityType_LEGACY) {
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aesStream := crypto.NewAesEncryptionStream(v.requestBodyKey, v.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.NoOpBytesGenerator{},
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AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
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}
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authWriter = crypto.NewAuthenticationWriter(auth, cryptionWriter, sizeMask)
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} else {
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authWriter = cryptionWriter
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}
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} else if request.Security.Is(protocol.SecurityType_AES128_GCM) {
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block, _ := aes.NewCipher(v.requestBodyKey)
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aead, _ := cipher.NewGCM(block)
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auth := &crypto.AEADAuthenticator{
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AEAD: aead,
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NonceGenerator: &ChunkNonceGenerator{
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Nonce: append([]byte(nil), v.requestBodyIV...),
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Size: aead.NonceSize(),
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},
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AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
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}
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authWriter = crypto.NewAuthenticationWriter(auth, writer, sizeMask)
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} else if request.Security.Is(protocol.SecurityType_CHACHA20_POLY1305) {
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aead, _ := chacha20poly1305.New(GenerateChacha20Poly1305Key(v.requestBodyKey))
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auth := &crypto.AEADAuthenticator{
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AEAD: aead,
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NonceGenerator: &ChunkNonceGenerator{
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Nonce: append([]byte(nil), v.requestBodyIV...),
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Size: aead.NonceSize(),
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},
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AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
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}
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authWriter = crypto.NewAuthenticationWriter(auth, writer, sizeMask)
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}
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return buf.NewWriter(authWriter)
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}
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func (v *ClientSession) DecodeResponseHeader(reader io.Reader) (*protocol.ResponseHeader, error) {
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aesStream := crypto.NewAesDecryptionStream(v.responseBodyKey, v.responseBodyIV)
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v.responseReader = crypto.NewCryptionReader(aesStream, reader)
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buffer := make([]byte, 256)
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_, err := io.ReadFull(v.responseReader, buffer[:4])
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if err != nil {
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log.Trace(newError("failed to read response header").Base(err))
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return nil, err
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}
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if buffer[0] != v.responseHeader {
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return nil, newError("unexpected response header. Expecting ", int(v.responseHeader), " but actually ", int(buffer[0]))
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}
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header := &protocol.ResponseHeader{
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Option: protocol.ResponseOption(buffer[1]),
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}
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if buffer[2] != 0 {
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cmdID := buffer[2]
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dataLen := int(buffer[3])
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_, err := io.ReadFull(v.responseReader, buffer[:dataLen])
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if err != nil {
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log.Trace(newError("failed to read response command").Base(err))
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return nil, err
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}
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data := buffer[:dataLen]
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command, err := UnmarshalCommand(cmdID, data)
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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 (v *ClientSession) DecodeResponseBody(request *protocol.RequestHeader, reader io.Reader) buf.Reader {
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var authReader io.Reader
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var sizeMask crypto.Uint16Generator = crypto.StaticUint16Generator(0)
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if request.Option.Has(protocol.RequestOptionChunkMasking) {
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sizeMask = getSizeMask(v.responseBodyIV)
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}
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if request.Security.Is(protocol.SecurityType_NONE) {
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if request.Option.Has(protocol.RequestOptionChunkStream) {
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auth := &crypto.AEADAuthenticator{
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AEAD: NoOpAuthenticator{},
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NonceGenerator: crypto.NoOpBytesGenerator{},
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AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
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}
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authReader = crypto.NewAuthenticationReader(auth, reader, sizeMask)
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} else {
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authReader = reader
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}
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} else if request.Security.Is(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.NoOpBytesGenerator{},
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AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
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}
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authReader = crypto.NewAuthenticationReader(auth, v.responseReader, sizeMask)
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} else {
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authReader = v.responseReader
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}
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} else if request.Security.Is(protocol.SecurityType_AES128_GCM) {
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block, _ := aes.NewCipher(v.responseBodyKey)
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aead, _ := cipher.NewGCM(block)
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auth := &crypto.AEADAuthenticator{
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AEAD: aead,
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NonceGenerator: &ChunkNonceGenerator{
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Nonce: append([]byte(nil), v.responseBodyIV...),
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Size: aead.NonceSize(),
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},
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AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
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}
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authReader = crypto.NewAuthenticationReader(auth, reader, sizeMask)
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} else if request.Security.Is(protocol.SecurityType_CHACHA20_POLY1305) {
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aead, _ := chacha20poly1305.New(GenerateChacha20Poly1305Key(v.responseBodyKey))
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auth := &crypto.AEADAuthenticator{
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AEAD: aead,
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NonceGenerator: &ChunkNonceGenerator{
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Nonce: append([]byte(nil), v.responseBodyIV...),
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Size: aead.NonceSize(),
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},
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AdditionalDataGenerator: crypto.NoOpBytesGenerator{},
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}
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authReader = crypto.NewAuthenticationReader(auth, reader, sizeMask)
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}
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return buf.NewReader(authReader)
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}
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type ChunkNonceGenerator struct {
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Nonce []byte
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Size int
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count uint16
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}
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func (v *ChunkNonceGenerator) Next() []byte {
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serial.Uint16ToBytes(v.count, v.Nonce[:0])
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v.count++
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return v.Nonce[:v.Size]
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}
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