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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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