Feature: ✨ add vmess support
This commit is contained in:
Dreamacro
115
common/vmess/aead.go
Normal file
115
common/vmess/aead.go
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@ -0,0 +1,115 @@
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package vmess
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import (
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"crypto/cipher"
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"encoding/binary"
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"errors"
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"io"
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)
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type aeadWriter struct {
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io.Writer
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cipher.AEAD
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nonce [32]byte
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count uint16
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iv []byte
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}
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func newAEADWriter(w io.Writer, aead cipher.AEAD, iv []byte) *aeadWriter {
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return &aeadWriter{Writer: w, AEAD: aead, iv: iv}
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}
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func (w *aeadWriter) Write(b []byte) (n int, err error) {
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buf := bufPool.Get().([]byte)
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defer bufPool.Put(buf[:cap(buf)])
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length := len(b)
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for {
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if length == 0 {
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break
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}
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readLen := chunkSize - w.Overhead()
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if length < readLen {
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readLen = length
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}
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payloadBuf := buf[lenSize : lenSize+chunkSize-w.Overhead()]
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copy(payloadBuf, b[n:n+readLen])
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binary.BigEndian.PutUint16(buf[:lenSize], uint16(readLen+w.Overhead()))
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binary.BigEndian.PutUint16(w.nonce[:2], w.count)
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copy(w.nonce[2:], w.iv[2:12])
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w.Seal(payloadBuf[:0], w.nonce[:w.NonceSize()], payloadBuf[:readLen], nil)
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w.count++
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_, err = w.Writer.Write(buf[:lenSize+readLen+w.Overhead()])
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if err != nil {
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break
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}
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n += readLen
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length -= readLen
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}
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return
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}
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type aeadReader struct {
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io.Reader
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cipher.AEAD
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nonce [32]byte
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buf []byte
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offset int
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iv []byte
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sizeBuf []byte
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count uint16
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}
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func newAEADReader(r io.Reader, aead cipher.AEAD, iv []byte) *aeadReader {
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return &aeadReader{Reader: r, AEAD: aead, iv: iv, sizeBuf: make([]byte, lenSize)}
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}
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func (r *aeadReader) Read(b []byte) (int, error) {
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if r.buf != nil {
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n := copy(b, r.buf[r.offset:])
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r.offset += n
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if r.offset == len(r.buf) {
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bufPool.Put(r.buf[:cap(r.buf)])
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r.buf = nil
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}
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return n, nil
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}
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_, err := io.ReadFull(r.Reader, r.sizeBuf)
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if err != nil {
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return 0, err
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}
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size := int(binary.BigEndian.Uint16(r.sizeBuf))
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if size > maxSize {
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return 0, errors.New("Buffer is larger than standard")
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}
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buf := bufPool.Get().([]byte)
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_, err = io.ReadFull(r.Reader, buf[:size])
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if err != nil {
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bufPool.Put(buf[:cap(buf)])
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return 0, err
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}
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binary.BigEndian.PutUint16(r.nonce[:2], r.count)
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copy(r.nonce[2:], r.iv[2:12])
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_, err = r.Open(buf[:0], r.nonce[:r.NonceSize()], buf[:size], nil)
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r.count++
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if err != nil {
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return 0, err
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}
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realLen := size - r.Overhead()
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n := copy(b, buf[:realLen])
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if len(b) >= realLen {
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bufPool.Put(buf[:cap(buf)])
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return n, nil
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}
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r.offset = n
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r.buf = buf[:realLen]
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return n, nil
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}
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103
common/vmess/chunk.go
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103
common/vmess/chunk.go
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@ -0,0 +1,103 @@
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package vmess
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import (
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"encoding/binary"
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"errors"
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"io"
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"sync"
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)
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const (
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lenSize = 2
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chunkSize = 1 << 14 // 2 ** 14 == 16 * 1024
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maxSize = 17 * 1024 // 2 + chunkSize + aead.Overhead()
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)
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var bufPool = sync.Pool{New: func() interface{} { return make([]byte, maxSize) }}
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type chunkReader struct {
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io.Reader
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buf []byte
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sizeBuf []byte
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offset int
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}
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func newChunkReader(reader io.Reader) *chunkReader {
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return &chunkReader{Reader: reader, sizeBuf: make([]byte, lenSize)}
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}
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func newChunkWriter(writer io.WriteCloser) *chunkWriter {
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return &chunkWriter{Writer: writer}
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}
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func (cr *chunkReader) Read(b []byte) (int, error) {
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if cr.buf != nil {
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n := copy(b, cr.buf[cr.offset:])
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cr.offset += n
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if cr.offset == len(cr.buf) {
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bufPool.Put(cr.buf[:cap(cr.buf)])
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cr.buf = nil
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}
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return n, nil
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}
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_, err := io.ReadFull(cr.Reader, cr.sizeBuf)
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if err != nil {
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return 0, err
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}
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size := int(binary.BigEndian.Uint16(cr.sizeBuf))
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if size > maxSize {
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return 0, errors.New("Buffer is larger than standard")
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}
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if len(b) >= size {
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_, err := io.ReadFull(cr.Reader, b[:size])
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if err != nil {
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return 0, err
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}
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return size, nil
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}
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buf := bufPool.Get().([]byte)
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_, err = io.ReadFull(cr.Reader, buf[:size])
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if err != nil {
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bufPool.Put(buf[:cap(buf)])
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return 0, err
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}
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n := copy(b, cr.buf[:])
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cr.offset = n
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cr.buf = buf[:size]
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return n, nil
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}
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type chunkWriter struct {
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io.Writer
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}
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func (cw *chunkWriter) Write(b []byte) (n int, err error) {
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buf := bufPool.Get().([]byte)
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defer bufPool.Put(buf[:cap(buf)])
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length := len(b)
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for {
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if length == 0 {
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break
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}
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readLen := chunkSize
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if length < chunkSize {
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readLen = length
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}
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payloadBuf := buf[lenSize : lenSize+chunkSize]
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copy(payloadBuf, b[n:n+readLen])
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binary.BigEndian.PutUint16(buf[:lenSize], uint16(readLen))
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_, err = cw.Writer.Write(buf[:lenSize+readLen])
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if err != nil {
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break
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}
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n += readLen
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length -= readLen
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}
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return
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}
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213
common/vmess/conn.go
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213
common/vmess/conn.go
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@ -0,0 +1,213 @@
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package vmess
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"crypto/hmac"
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"crypto/md5"
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"encoding/binary"
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"errors"
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"hash/fnv"
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"io"
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"math/rand"
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"net"
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"time"
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"golang.org/x/crypto/chacha20poly1305"
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)
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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// Conn wrapper a net.Conn with vmess protocol
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type Conn struct {
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net.Conn
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reader io.Reader
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writer io.Writer
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dst *DstAddr
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id *ID
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reqBodyIV []byte
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reqBodyKey []byte
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respBodyIV []byte
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respBodyKey []byte
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respV byte
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security byte
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sent bool
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received bool
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}
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func (vc *Conn) Write(b []byte) (int, error) {
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if vc.sent {
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return vc.writer.Write(b)
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}
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if err := vc.sendRequest(); err != nil {
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return 0, err
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}
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vc.sent = true
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return vc.writer.Write(b)
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}
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func (vc *Conn) Read(b []byte) (int, error) {
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if vc.received {
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return vc.reader.Read(b)
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}
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if err := vc.recvResponse(); err != nil {
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return 0, err
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}
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vc.received = true
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return vc.reader.Read(b)
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}
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func (vc *Conn) sendRequest() error {
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timestamp := make([]byte, 8)
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binary.BigEndian.PutUint64(timestamp, uint64(time.Now().UTC().Unix()))
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h := hmac.New(md5.New, vc.id.UUID.Bytes())
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h.Write(timestamp)
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_, err := vc.Conn.Write(h.Sum(nil))
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if err != nil {
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return err
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}
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buf := &bytes.Buffer{}
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// Ver IV Key V Opt
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buf.WriteByte(Version)
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buf.Write(vc.reqBodyIV[:])
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buf.Write(vc.reqBodyKey[:])
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buf.WriteByte(vc.respV)
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buf.WriteByte(OptionChunkStream)
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p := rand.Intn(16)
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// P Sec Reserve Cmd
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buf.WriteByte(byte(p<<4) | byte(vc.security))
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buf.WriteByte(0)
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buf.WriteByte(CommandTCP)
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// Port AddrType Addr
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binary.Write(buf, binary.BigEndian, uint16(vc.dst.Port))
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buf.WriteByte(vc.dst.AddrType)
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buf.Write(vc.dst.Addr)
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// padding
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if p > 0 {
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padding := make([]byte, p)
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rand.Read(padding)
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buf.Write(padding)
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}
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fnv1a := fnv.New32a()
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fnv1a.Write(buf.Bytes())
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buf.Write(fnv1a.Sum(nil))
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block, err := aes.NewCipher(vc.id.CmdKey)
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if err != nil {
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return err
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}
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stream := cipher.NewCFBEncrypter(block, hashTimestamp(time.Now().UTC()))
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stream.XORKeyStream(buf.Bytes(), buf.Bytes())
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_, err = vc.Conn.Write(buf.Bytes())
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return err
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}
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func (vc *Conn) recvResponse() error {
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block, err := aes.NewCipher(vc.respBodyKey[:])
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if err != nil {
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return err
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}
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stream := cipher.NewCFBDecrypter(block, vc.respBodyIV[:])
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buf := make([]byte, 4)
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_, err = io.ReadFull(vc.Conn, buf)
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if err != nil {
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return err
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}
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stream.XORKeyStream(buf, buf)
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if buf[0] != vc.respV {
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return errors.New("unexpected response header")
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}
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if buf[2] != 0 {
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return errors.New("dynamic port is not supported now")
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}
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return nil
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}
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func hashTimestamp(t time.Time) []byte {
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md5hash := md5.New()
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ts := make([]byte, 8)
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binary.BigEndian.PutUint64(ts, uint64(t.UTC().Unix()))
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md5hash.Write(ts)
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md5hash.Write(ts)
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md5hash.Write(ts)
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md5hash.Write(ts)
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return md5hash.Sum(nil)
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}
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// newConn return a Conn instance
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func newConn(conn net.Conn, id *ID, dst *DstAddr, security Security) *Conn {
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randBytes := make([]byte, 33)
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rand.Read(randBytes)
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reqBodyIV := make([]byte, 16)
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reqBodyKey := make([]byte, 16)
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copy(reqBodyIV[:], randBytes[:16])
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copy(reqBodyKey[:], randBytes[16:32])
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respV := randBytes[32]
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respBodyKey := md5.Sum(reqBodyKey[:])
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respBodyIV := md5.Sum(reqBodyIV[:])
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var writer io.Writer
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var reader io.Reader
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switch security {
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case SecurityNone:
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reader = newChunkReader(conn)
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writer = newChunkWriter(conn)
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case SecurityAES128GCM:
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block, _ := aes.NewCipher(reqBodyKey[:])
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aead, _ := cipher.NewGCM(block)
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writer = newAEADWriter(conn, aead, reqBodyIV[:])
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block, _ = aes.NewCipher(respBodyKey[:])
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aead, _ = cipher.NewGCM(block)
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reader = newAEADReader(conn, aead, respBodyIV[:])
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case SecurityCHACHA20POLY1305:
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key := make([]byte, 32)
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t := md5.Sum(reqBodyKey[:])
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copy(key, t[:])
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t = md5.Sum(key[:16])
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copy(key[16:], t[:])
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aead, _ := chacha20poly1305.New(key)
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writer = newAEADWriter(conn, aead, reqBodyIV[:])
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t = md5.Sum(respBodyKey[:])
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copy(key, t[:])
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t = md5.Sum(key[:16])
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copy(key[16:], t[:])
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aead, _ = chacha20poly1305.New(key)
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reader = newAEADReader(conn, aead, respBodyIV[:])
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}
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return &Conn{
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Conn: conn,
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id: id,
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dst: dst,
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reqBodyIV: reqBodyIV,
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reqBodyKey: reqBodyKey,
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respV: respV,
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respBodyIV: respBodyIV[:],
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respBodyKey: respBodyKey[:],
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reader: reader,
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writer: writer,
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security: security,
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}
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}
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54
common/vmess/user.go
Normal file
54
common/vmess/user.go
Normal file
@ -0,0 +1,54 @@
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package vmess
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import (
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"bytes"
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"crypto/md5"
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"github.com/gofrs/uuid"
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)
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// ID cmdKey length
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const (
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IDBytesLen = 16
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)
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// The ID of en entity, in the form of a UUID.
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type ID struct {
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UUID *uuid.UUID
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CmdKey []byte
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}
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|
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// newID returns an ID with given UUID.
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func newID(uuid *uuid.UUID) *ID {
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id := &ID{UUID: uuid, CmdKey: make([]byte, IDBytesLen)}
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md5hash := md5.New()
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md5hash.Write(uuid.Bytes())
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md5hash.Write([]byte("c48619fe-8f02-49e0-b9e9-edf763e17e21"))
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md5hash.Sum(id.CmdKey[:0])
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return id
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}
|
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|
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func nextID(u *uuid.UUID) *uuid.UUID {
|
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md5hash := md5.New()
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md5hash.Write(u.Bytes())
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md5hash.Write([]byte("16167dc8-16b6-4e6d-b8bb-65dd68113a81"))
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var newid uuid.UUID
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for {
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md5hash.Sum(newid[:0])
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if !bytes.Equal(newid.Bytes(), u.Bytes()) {
|
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return &newid
|
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}
|
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md5hash.Write([]byte("533eff8a-4113-4b10-b5ce-0f5d76b98cd2"))
|
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}
|
||||
}
|
||||
|
||||
func newAlterIDs(primary *ID, alterIDCount uint16) []*ID {
|
||||
alterIDs := make([]*ID, alterIDCount)
|
||||
prevID := primary.UUID
|
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for idx := range alterIDs {
|
||||
newid := nextID(prevID)
|
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alterIDs[idx] = &ID{UUID: newid, CmdKey: primary.CmdKey[:]}
|
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prevID = newid
|
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}
|
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return alterIDs
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}
|
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106
common/vmess/vmess.go
Normal file
106
common/vmess/vmess.go
Normal file
@ -0,0 +1,106 @@
|
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package vmess
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"math/rand"
|
||||
"net"
|
||||
"runtime"
|
||||
|
||||
"github.com/gofrs/uuid"
|
||||
)
|
||||
|
||||
// Version of vmess
|
||||
const Version byte = 1
|
||||
|
||||
// Request Options
|
||||
const (
|
||||
OptionChunkStream byte = 1
|
||||
OptionChunkMasking byte = 4
|
||||
)
|
||||
|
||||
// Security type vmess
|
||||
type Security = byte
|
||||
|
||||
// Cipher types
|
||||
const (
|
||||
SecurityAES128GCM Security = 3
|
||||
SecurityCHACHA20POLY1305 Security = 4
|
||||
SecurityNone Security = 5
|
||||
)
|
||||
|
||||
// CipherMapping return
|
||||
var CipherMapping = map[string]byte{
|
||||
"none": SecurityNone,
|
||||
"aes-128-gcm": SecurityAES128GCM,
|
||||
"chacha20-poly1305": SecurityCHACHA20POLY1305,
|
||||
}
|
||||
|
||||
// Command types
|
||||
const (
|
||||
CommandTCP byte = 1
|
||||
CommandUDP byte = 2
|
||||
)
|
||||
|
||||
// Addr types
|
||||
const (
|
||||
AtypIPv4 byte = 1
|
||||
AtypDomainName byte = 2
|
||||
AtypIPv6 byte = 3
|
||||
)
|
||||
|
||||
// DstAddr store destination address
|
||||
type DstAddr struct {
|
||||
AddrType byte
|
||||
Addr []byte
|
||||
Port uint
|
||||
}
|
||||
|
||||
// Client is vmess connection generator
|
||||
type Client struct {
|
||||
user []*ID
|
||||
uuid *uuid.UUID
|
||||
security Security
|
||||
}
|
||||
|
||||
// Config of vmess
|
||||
type Config struct {
|
||||
UUID string
|
||||
AlterID uint16
|
||||
Security string
|
||||
}
|
||||
|
||||
// New return a Conn with net.Conn and DstAddr
|
||||
func (c *Client) New(conn net.Conn, dst *DstAddr) net.Conn {
|
||||
r := rand.Intn(len(c.user))
|
||||
return newConn(conn, c.user[r], dst, c.security)
|
||||
}
|
||||
|
||||
// NewClient return Client instance
|
||||
func NewClient(config Config) (*Client, error) {
|
||||
uid, err := uuid.FromString(config.UUID)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
var security Security
|
||||
switch config.Security {
|
||||
case "aes-128-gcm":
|
||||
security = SecurityAES128GCM
|
||||
case "chacha20-poly1305":
|
||||
security = SecurityCHACHA20POLY1305
|
||||
case "none":
|
||||
security = SecurityNone
|
||||
case "auto":
|
||||
security = SecurityCHACHA20POLY1305
|
||||
if runtime.GOARCH == "amd64" || runtime.GOARCH == "s390x" || runtime.GOARCH == "arm64" {
|
||||
security = SecurityAES128GCM
|
||||
}
|
||||
default:
|
||||
return nil, fmt.Errorf("Unknown security type: %s", config.Security)
|
||||
}
|
||||
return &Client{
|
||||
user: newAlterIDs(newID(&uid), config.AlterID),
|
||||
uuid: &uid,
|
||||
security: security,
|
||||
}, nil
|
||||
}
|
||||
Reference in New Issue
Block a user