/
client.go
390 lines (320 loc) · 8.14 KB
/
client.go
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package vmess
import (
"bytes"
"crypto"
"crypto/aes"
"crypto/cipher"
"crypto/md5"
crand "crypto/rand"
"crypto/sha256"
"encoding/binary"
"errors"
"fmt"
"hash/fnv"
"io"
"math/rand/v2"
"net"
"runtime"
"strings"
"time"
"github.com/Asutorufa/yuhaiin/pkg/net/netapi"
ssr "github.com/Asutorufa/yuhaiin/pkg/net/proxy/shadowsocksr/utils"
"github.com/Asutorufa/yuhaiin/pkg/utils/relay"
"github.com/Asutorufa/yuhaiin/pkg/utils/uuid"
"golang.org/x/crypto/chacha20poly1305"
)
// Request Options
const (
OptBasicFormat byte = 0
OptChunkStream byte = 1
// OptReuseTCPConnection byte = 2
// OptMetadataObfuscate byte = 4
)
// Security types
const (
SecurityAES128GCM byte = 3
SecurityChacha20Poly1305 byte = 4
SecurityNone byte = 5
)
type CMD byte
// CMD types
const (
CmdTCP CMD = 1
CmdUDP CMD = 2
)
func (c CMD) Byte() byte { return byte(c) }
var _ net.Conn = (*Conn)(nil)
// Client vmess client
type Client struct {
users []*User
opt byte
security byte
isAead bool
}
// Conn is a connection to vmess server
type Conn struct {
user *User
opt byte
security byte
addr address
reqBodyIV [16]byte
reqBodyKey [16]byte
reqRespV byte
respBodyIV [16]byte
respBodyKey [16]byte
net.Conn
dataReader io.ReadCloser
dataWriter writer
isAead bool
CMD CMD
}
// NewClient .
func newClient(uuidStr, security string, alterID int) (*Client, error) {
uuid, err := uuid.ParseStd(uuidStr)
if err != nil {
return nil, err
}
c := &Client{isAead: alterID == 0}
user := NewUser(uuid)
c.users = append(c.users, user)
c.users = append(c.users, user.GenAlterIDUsers(alterID)...)
c.opt = OptChunkStream
security = strings.ToLower(security)
switch security {
case "aes-128-gcm":
c.security = SecurityAES128GCM
case "chacha20-poly1305":
c.security = SecurityChacha20Poly1305
case "none":
c.security = SecurityNone
case "auto":
fallthrough
case "":
c.security = SecurityChacha20Poly1305
if runtime.GOARCH == "amd64" || runtime.GOARCH == "s390x" || runtime.GOARCH == "arm64" {
c.security = SecurityAES128GCM
}
// NOTE: use basic format when no method specified
// c.opt = OptBasicFormat
// c.security = SecurityNone
default:
return nil, errors.New("unknown security type: " + security)
}
return c, nil
}
func (c *Client) NewConn(rc net.Conn, dst netapi.Address) (net.Conn, error) {
return c.newConn(rc, CmdTCP, dst)
}
func (c *Client) NewPacketConn(rc net.Conn, dst netapi.Address) (net.PacketConn, error) {
return c.newConn(rc, CmdUDP, dst)
}
// NewConn .
func (c *Client) newConn(rc net.Conn, cmd CMD, dst netapi.Address) (*Conn, error) {
conn := &Conn{
isAead: c.isAead,
user: c.users[rand.IntN(len(c.users))],
opt: c.opt,
security: c.security,
CMD: cmd,
addr: address{dst},
}
randBytes := make([]byte, 33)
_, _ = crand.Read(randBytes)
copy(conn.reqBodyIV[:], randBytes[:16])
copy(conn.reqBodyKey[:], randBytes[16:32])
conn.reqRespV = randBytes[32]
if !c.isAead {
conn.respBodyIV = md5.Sum(conn.reqBodyIV[:])
conn.respBodyKey = md5.Sum(conn.reqBodyKey[:])
} else {
rbIV := sha256.Sum256(conn.reqBodyIV[:])
copy(conn.respBodyIV[:], rbIV[:16])
rbKey := sha256.Sum256(conn.reqBodyKey[:])
copy(conn.respBodyKey[:], rbKey[:16])
}
// Request
req, err := conn.EncodeRequest()
if err != nil {
return nil, err
}
_, err = rc.Write(req)
if err != nil {
return nil, err
}
conn.Conn = rc
return conn, nil
}
func (c *Conn) RemoteAddr() net.Addr { return c.addr }
// EncodeRequest encodes requests to network bytes
func (c *Conn) EncodeRequest() ([]byte, error) {
buf := new(bytes.Buffer)
// Request
buf.WriteByte(1) // Ver
buf.Write(c.reqBodyIV[:]) // IV
buf.Write(c.reqBodyKey[:]) // Key
buf.WriteByte(c.reqRespV) // V
buf.WriteByte(c.opt) // Opt
// pLen and Sec
paddingLen := rand.IntN(16)
buf.WriteByte(byte(paddingLen<<4) | c.security) // P(4bit) and Sec(4bit)
buf.WriteByte(0) // reserved
buf.WriteByte(c.CMD.Byte()) // cmd
// target
_ = binary.Write(buf, binary.BigEndian, uint16(c.addr.Port().Port())) // port
buf.WriteByte(byte(c.addr.Type())) // atyp
buf.Write(c.addr.Bytes()) // addr
// padding
if paddingLen > 0 {
_, _ = relay.CopyN(buf, crand.Reader, int64(paddingLen))
}
// F
fnv1a := fnv.New32a()
fnv1a.Write(buf.Bytes())
buf.Write(fnv1a.Sum(nil))
if !c.isAead {
now := time.Now().UTC()
block, err := aes.NewCipher(c.user.CmdKey[:])
if err != nil {
return nil, err
}
stream := cipher.NewCFBEncrypter(block, TimestampHash(now))
stream.XORKeyStream(buf.Bytes(), buf.Bytes())
abuf := new(bytes.Buffer)
ts := make([]byte, 8)
binary.BigEndian.PutUint64(ts, uint64(now.Unix()))
abuf.Write(ssr.Hmac(crypto.MD5, c.user.UUID.Bytes(), ts, nil))
abuf.Write(buf.Bytes())
return abuf.Bytes(), nil
}
// aead
var fixedLengthCmdKey [16]byte
copy(fixedLengthCmdKey[:], c.user.CmdKey[:])
vmessout := SealVMessAEADHeader(fixedLengthCmdKey, buf.Bytes())
return vmessout, nil
}
// DecodeRespHeader .
func (c *Conn) DecodeRespHeader() error {
var buf []byte
if !c.isAead {
// !none aead
block, err := aes.NewCipher(c.respBodyKey[:])
if err != nil {
return err
}
stream := cipher.NewCFBDecrypter(block, c.respBodyIV[:])
buf = make([]byte, 4)
_, err = io.ReadFull(c.Conn, buf)
if err != nil {
return err
}
stream.XORKeyStream(buf, buf)
} else {
var err error
buf, err = DecodeResponseHeader(c.respBodyKey[:], c.respBodyIV[:], c.Conn)
if err != nil {
return fmt.Errorf("decode response header failed: %w", err)
}
if len(buf) < 4 {
return errors.New("unexpected buffer length")
}
}
if buf[0] != c.reqRespV {
return errors.New("unexpected response header")
}
// TODO: Dynamic port support
if buf[2] != 0 {
// dataLen := int32(buf[3])
return errors.New("dynamic port is not supported now")
}
return nil
}
func (c *Conn) Write(b []byte) (n int, err error) {
for {
if c.dataWriter != nil {
return c.dataWriter.Write(b)
}
c.initWriter()
}
}
func (c *Conn) initWriter() {
c.dataWriter = &connWriter{Conn: c.Conn}
if c.opt&OptChunkStream == OptChunkStream {
switch c.security {
case SecurityNone:
c.dataWriter = ChunkedWriter(c.Conn)
case SecurityAES128GCM:
block, _ := aes.NewCipher(c.reqBodyKey[:])
aead, _ := cipher.NewGCM(block)
c.dataWriter = AEADWriter(c.Conn, aead, c.reqBodyIV[:])
case SecurityChacha20Poly1305:
key := make([]byte, 32)
t := md5.Sum(c.reqBodyKey[:])
copy(key, t[:])
t = md5.Sum(key[:16])
copy(key[16:], t[:])
aead, _ := chacha20poly1305.New(key)
c.dataWriter = AEADWriter(c.Conn, aead, c.reqBodyIV[:])
}
}
}
func (c *Conn) Read(b []byte) (n int, err error) {
if c.dataReader != nil {
return c.dataReader.Read(b)
}
err = c.DecodeRespHeader()
if err != nil {
return 0, err
}
c.dataReader = c.Conn
if c.opt&OptChunkStream == OptChunkStream {
switch c.security {
case SecurityNone:
c.dataReader = ChunkedReader(c.Conn)
case SecurityAES128GCM:
block, err := aes.NewCipher(c.respBodyKey[:])
if err != nil {
return 0, fmt.Errorf("new aes cipher failed: %w", err)
}
aead, err := cipher.NewGCM(block)
if err != nil {
return 0, fmt.Errorf("new gcm failed: %w", err)
}
c.dataReader = AEADReader(c.Conn, aead, c.respBodyIV[:])
case SecurityChacha20Poly1305:
key := make([]byte, 32)
t := md5.Sum(c.respBodyKey[:])
copy(key, t[:])
t = md5.Sum(key[:16])
copy(key[16:], t[:])
aead, err := chacha20poly1305.New(key)
if err != nil {
return 0, fmt.Errorf("new chacha20poly1305 failed: %w", err)
}
c.dataReader = AEADReader(c.Conn, aead, c.respBodyIV[:])
}
}
return c.dataReader.Read(b)
}
func (c *Conn) Close() error {
if c.dataReader != nil {
defer c.dataReader.Close()
}
if c.dataWriter != nil {
defer c.dataWriter.Close()
}
return c.Conn.Close()
}
func (c *Conn) ReadFrom(b []byte) (int, net.Addr, error) {
n, err := c.Read(b)
return n, c.RemoteAddr(), err
}
func (c *Conn) WriteTo(b []byte, target net.Addr) (int, error) {
t, err := netapi.ParseSysAddr(target)
if err != nil {
return 0, err
}
if t.String() != c.addr.Address.String() {
return 0, fmt.Errorf("vmess only support symmetric NAT")
}
return c.Write(b)
}