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feat: Support ShadowTLS v2 as Shadowsocks plugin (#330)
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,142 @@ | ||
package shadowtls | ||
|
||
import ( | ||
"crypto/hmac" | ||
"crypto/sha1" | ||
"encoding/binary" | ||
"fmt" | ||
"hash" | ||
"io" | ||
"net" | ||
|
||
"github.com/Dreamacro/clash/common/pool" | ||
"github.com/Dreamacro/clash/transport/trojan" | ||
) | ||
|
||
const ( | ||
chunkSize = 1 << 13 | ||
Mode string = "shadow-tls" | ||
hashLen int = 8 | ||
tlsHeaderLen int = 5 | ||
) | ||
|
||
// TLSObfs is shadowsocks tls simple-obfs implementation | ||
type ShadowTls struct { | ||
net.Conn | ||
password []byte | ||
remain int | ||
firstRequest bool | ||
tlsConnector *trojan.Trojan | ||
} | ||
|
||
type HashedConn struct { | ||
net.Conn | ||
hasher hash.Hash | ||
} | ||
|
||
func newHashedStream(conn net.Conn, password []byte) HashedConn { | ||
return HashedConn{ | ||
Conn: conn, | ||
hasher: hmac.New(sha1.New, password), | ||
} | ||
} | ||
|
||
func (h HashedConn) Read(b []byte) (n int, err error) { | ||
n, err = h.Conn.Read(b) | ||
h.hasher.Write(b[:n]) | ||
return | ||
} | ||
|
||
func (to *ShadowTls) read(b []byte) (int, error) { | ||
buf := pool.Get(tlsHeaderLen) | ||
_, err := io.ReadFull(to.Conn, buf) | ||
if err != nil { | ||
return 0, fmt.Errorf("shadowtls read failed %w", err) | ||
} | ||
if buf[0] != 0x17 || buf[1] != 0x3 || buf[2] != 0x3 { | ||
return 0, fmt.Errorf("invalid shadowtls header %v", buf) | ||
} | ||
length := int(binary.BigEndian.Uint16(buf[3:])) | ||
pool.Put(buf) | ||
|
||
if length > len(b) { | ||
n, err := to.Conn.Read(b) | ||
if err != nil { | ||
return n, err | ||
} | ||
to.remain = length - n | ||
return n, nil | ||
} | ||
|
||
return io.ReadFull(to.Conn, b[:length]) | ||
} | ||
|
||
func (to *ShadowTls) Read(b []byte) (int, error) { | ||
if to.remain > 0 { | ||
length := to.remain | ||
if length > len(b) { | ||
length = len(b) | ||
} | ||
|
||
n, err := io.ReadFull(to.Conn, b[:length]) | ||
if err != nil { | ||
return n, fmt.Errorf("shadowtls Read failed with %w", err) | ||
} | ||
to.remain -= n | ||
return n, nil | ||
} | ||
|
||
return to.read(b) | ||
} | ||
|
||
func (to *ShadowTls) Write(b []byte) (int, error) { | ||
length := len(b) | ||
for i := 0; i < length; i += chunkSize { | ||
end := i + chunkSize | ||
if end > length { | ||
end = length | ||
} | ||
|
||
n, err := to.write(b[i:end]) | ||
if err != nil { | ||
return n, fmt.Errorf("shadowtls Write failed with %w, i=%d, end=%d, n=%d", err, i, end, n) | ||
} | ||
} | ||
return length, nil | ||
} | ||
|
||
func (s *ShadowTls) write(b []byte) (int, error) { | ||
var hashVal []byte | ||
if s.firstRequest { | ||
hashedConn := newHashedStream(s.Conn, s.password) | ||
if _, err := s.tlsConnector.StreamConn(hashedConn); err != nil { | ||
return 0, fmt.Errorf("tls connect failed with %w", err) | ||
} | ||
hashVal = hashedConn.hasher.Sum(nil)[:hashLen] | ||
s.firstRequest = false | ||
} | ||
|
||
buf := pool.GetBuffer() | ||
defer pool.PutBuffer(buf) | ||
buf.Write([]byte{0x17, 0x03, 0x03}) | ||
binary.Write(buf, binary.BigEndian, uint16(len(b)+len(hashVal))) | ||
buf.Write(hashVal) | ||
buf.Write(b) | ||
_, err := s.Conn.Write(buf.Bytes()) | ||
if err != nil { | ||
// return 0 because errors occur here make the | ||
// whole situation irrecoverable | ||
return 0, err | ||
} | ||
return len(b), nil | ||
} | ||
|
||
// NewShadowTls return a ShadowTls | ||
func NewShadowTls(conn net.Conn, password string, tlsConnector *trojan.Trojan) net.Conn { | ||
return &ShadowTls{ | ||
Conn: conn, | ||
password: []byte(password), | ||
firstRequest: true, | ||
tlsConnector: tlsConnector, | ||
} | ||
} |
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