mirror of
https://gitclone.com/github.com/MetaCubeX/Clash.Meta
synced 2024-11-15 21:51:23 +08:00
291 lines
7.7 KiB
Go
291 lines
7.7 KiB
Go
package obfs
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/hmac"
|
|
"encoding/binary"
|
|
"fmt"
|
|
"io"
|
|
"math/rand"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/Dreamacro/clash/common/pool"
|
|
"github.com/Dreamacro/clash/component/ssr/tools"
|
|
"github.com/Dreamacro/clash/log"
|
|
)
|
|
|
|
type tlsAuthData struct {
|
|
localClientID [32]byte
|
|
}
|
|
|
|
type tls12Ticket struct {
|
|
*Base
|
|
*tlsAuthData
|
|
handshakeStatus int
|
|
sendSaver bytes.Buffer
|
|
recvBuffer bytes.Buffer
|
|
buffer bytes.Buffer
|
|
}
|
|
|
|
func init() {
|
|
register("tls1.2_ticket_auth", newTLS12Ticket)
|
|
register("tls1.2_ticket_fastauth", newTLS12Ticket)
|
|
}
|
|
|
|
func newTLS12Ticket(b *Base) Obfs {
|
|
return &tls12Ticket{
|
|
Base: b,
|
|
}
|
|
}
|
|
|
|
func (t *tls12Ticket) initForConn() Obfs {
|
|
r := &tls12Ticket{
|
|
Base: t.Base,
|
|
tlsAuthData: &tlsAuthData{},
|
|
}
|
|
rand.Read(r.localClientID[:])
|
|
return r
|
|
}
|
|
|
|
func (t *tls12Ticket) GetObfsOverhead() int {
|
|
return 5
|
|
}
|
|
|
|
func (t *tls12Ticket) Decode(b []byte) ([]byte, bool, error) {
|
|
if t.handshakeStatus == -1 {
|
|
return b, false, nil
|
|
}
|
|
t.buffer.Reset()
|
|
if t.handshakeStatus == 8 {
|
|
t.recvBuffer.Write(b)
|
|
for t.recvBuffer.Len() > 5 {
|
|
var h [5]byte
|
|
t.recvBuffer.Read(h[:])
|
|
if !bytes.Equal(h[:3], []byte{0x17, 0x3, 0x3}) {
|
|
log.Warnln("incorrect magic number %x, 0x170303 is expected", h[:3])
|
|
return nil, false, errTLS12TicketAuthIncorrectMagicNumber
|
|
}
|
|
size := int(binary.BigEndian.Uint16(h[3:5]))
|
|
if t.recvBuffer.Len() < size {
|
|
// 不够读，下回再读吧
|
|
unread := t.recvBuffer.Bytes()
|
|
t.recvBuffer.Reset()
|
|
t.recvBuffer.Write(h[:])
|
|
t.recvBuffer.Write(unread)
|
|
break
|
|
}
|
|
d := pool.Get(size)
|
|
t.recvBuffer.Read(d)
|
|
t.buffer.Write(d)
|
|
pool.Put(d)
|
|
}
|
|
return t.buffer.Bytes(), false, nil
|
|
}
|
|
|
|
if len(b) < 11+32+1+32 {
|
|
return nil, false, errTLS12TicketAuthTooShortData
|
|
}
|
|
|
|
hash := t.hmacSHA1(b[11 : 11+22])
|
|
|
|
if !hmac.Equal(b[33:33+tools.HmacSHA1Len], hash) {
|
|
return nil, false, errTLS12TicketAuthHMACError
|
|
}
|
|
return nil, true, nil
|
|
}
|
|
|
|
func (t *tls12Ticket) Encode(b []byte) ([]byte, error) {
|
|
t.buffer.Reset()
|
|
switch t.handshakeStatus {
|
|
case 8:
|
|
if len(b) < 1024 {
|
|
d := []byte{0x17, 0x3, 0x3, 0, 0}
|
|
binary.BigEndian.PutUint16(d[3:5], uint16(len(b)&0xFFFF))
|
|
t.buffer.Write(d)
|
|
t.buffer.Write(b)
|
|
return t.buffer.Bytes(), nil
|
|
}
|
|
start := 0
|
|
var l int
|
|
for len(b)-start > 2048 {
|
|
l = rand.Intn(4096) + 100
|
|
if l > len(b)-start {
|
|
l = len(b) - start
|
|
}
|
|
packData(&t.buffer, b[start:start+l])
|
|
start += l
|
|
}
|
|
if len(b)-start > 0 {
|
|
l = len(b) - start
|
|
packData(&t.buffer, b[start:start+l])
|
|
}
|
|
return t.buffer.Bytes(), nil
|
|
case 1:
|
|
if len(b) > 0 {
|
|
if len(b) < 1024 {
|
|
packData(&t.sendSaver, b)
|
|
} else {
|
|
start := 0
|
|
var l int
|
|
for len(b)-start > 2048 {
|
|
l = rand.Intn(4096) + 100
|
|
if l > len(b)-start {
|
|
l = len(b) - start
|
|
}
|
|
packData(&t.buffer, b[start:start+l])
|
|
start += l
|
|
}
|
|
if len(b)-start > 0 {
|
|
l = len(b) - start
|
|
packData(&t.buffer, b[start:start+l])
|
|
}
|
|
io.Copy(&t.sendSaver, &t.buffer)
|
|
}
|
|
return []byte{}, nil
|
|
}
|
|
hmacData := make([]byte, 43)
|
|
handshakeFinish := []byte("\x14\x03\x03\x00\x01\x01\x16\x03\x03\x00\x20")
|
|
copy(hmacData, handshakeFinish)
|
|
rand.Read(hmacData[11:33])
|
|
h := t.hmacSHA1(hmacData[:33])
|
|
copy(hmacData[33:], h)
|
|
t.buffer.Write(hmacData)
|
|
io.Copy(&t.buffer, &t.sendSaver)
|
|
t.handshakeStatus = 8
|
|
return t.buffer.Bytes(), nil
|
|
case 0:
|
|
tlsData0 := []byte("\x00\x1c\xc0\x2b\xc0\x2f\xcc\xa9\xcc\xa8\xcc\x14\xcc\x13\xc0\x0a\xc0\x14\xc0\x09\xc0\x13\x00\x9c\x00\x35\x00\x2f\x00\x0a\x01\x00")
|
|
tlsData1 := []byte("\xff\x01\x00\x01\x00")
|
|
tlsData2 := []byte("\x00\x17\x00\x00\x00\x23\x00\xd0")
|
|
// tlsData3 := []byte("\x00\x0d\x00\x16\x00\x14\x06\x01\x06\x03\x05\x01\x05\x03\x04\x01\x04\x03\x03\x01\x03\x03\x02\x01\x02\x03\x00\x05\x00\x05\x01\x00\x00\x00\x00\x00\x12\x00\x00\x75\x50\x00\x00\x00\x0b\x00\x02\x01\x00\x00\x0a\x00\x06\x00\x04\x00\x17\x00\x18\x00\x15\x00\x66\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
|
|
tlsData3 := []byte("\x00\x0d\x00\x16\x00\x14\x06\x01\x06\x03\x05\x01\x05\x03\x04\x01\x04\x03\x03\x01\x03\x03\x02\x01\x02\x03\x00\x05\x00\x05\x01\x00\x00\x00\x00\x00\x12\x00\x00\x75\x50\x00\x00\x00\x0b\x00\x02\x01\x00\x00\x0a\x00\x06\x00\x04\x00\x17\x00\x18")
|
|
|
|
var tlsData [2048]byte
|
|
tlsDataLen := 0
|
|
copy(tlsData[0:], tlsData1)
|
|
tlsDataLen += len(tlsData1)
|
|
sni := t.sni(t.getHost())
|
|
copy(tlsData[tlsDataLen:], sni)
|
|
tlsDataLen += len(sni)
|
|
copy(tlsData[tlsDataLen:], tlsData2)
|
|
tlsDataLen += len(tlsData2)
|
|
ticketLen := rand.Intn(164)*2 + 64
|
|
tlsData[tlsDataLen-1] = uint8(ticketLen & 0xff)
|
|
tlsData[tlsDataLen-2] = uint8(ticketLen >> 8)
|
|
//ticketLen := 208
|
|
rand.Read(tlsData[tlsDataLen : tlsDataLen+ticketLen])
|
|
tlsDataLen += ticketLen
|
|
copy(tlsData[tlsDataLen:], tlsData3)
|
|
tlsDataLen += len(tlsData3)
|
|
|
|
length := 11 + 32 + 1 + 32 + len(tlsData0) + 2 + tlsDataLen
|
|
encodedData := make([]byte, length)
|
|
pdata := length - tlsDataLen
|
|
l := tlsDataLen
|
|
copy(encodedData[pdata:], tlsData[:tlsDataLen])
|
|
encodedData[pdata-1] = uint8(tlsDataLen)
|
|
encodedData[pdata-2] = uint8(tlsDataLen >> 8)
|
|
pdata -= 2
|
|
l += 2
|
|
copy(encodedData[pdata-len(tlsData0):], tlsData0)
|
|
pdata -= len(tlsData0)
|
|
l += len(tlsData0)
|
|
copy(encodedData[pdata-32:], t.localClientID[:])
|
|
pdata -= 32
|
|
l += 32
|
|
encodedData[pdata-1] = 0x20
|
|
pdata--
|
|
l++
|
|
copy(encodedData[pdata-32:], t.packAuthData())
|
|
pdata -= 32
|
|
l += 32
|
|
encodedData[pdata-1] = 0x3
|
|
encodedData[pdata-2] = 0x3 // tls version
|
|
pdata -= 2
|
|
l += 2
|
|
encodedData[pdata-1] = uint8(l)
|
|
encodedData[pdata-2] = uint8(l >> 8)
|
|
encodedData[pdata-3] = 0
|
|
encodedData[pdata-4] = 1
|
|
pdata -= 4
|
|
l += 4
|
|
encodedData[pdata-1] = uint8(l)
|
|
encodedData[pdata-2] = uint8(l >> 8)
|
|
pdata -= 2
|
|
l += 2
|
|
encodedData[pdata-1] = 0x1
|
|
encodedData[pdata-2] = 0x3 // tls version
|
|
pdata -= 2
|
|
l += 2
|
|
encodedData[pdata-1] = 0x16 // tls handshake
|
|
pdata--
|
|
l++
|
|
packData(&t.sendSaver, b)
|
|
t.handshakeStatus = 1
|
|
return encodedData, nil
|
|
default:
|
|
return nil, fmt.Errorf("unexpected handshake status: %d", t.handshakeStatus)
|
|
}
|
|
}
|
|
|
|
func (t *tls12Ticket) hmacSHA1(data []byte) []byte {
|
|
key := make([]byte, len(t.Key)+32)
|
|
copy(key, t.Key)
|
|
copy(key[len(t.Key):], t.localClientID[:])
|
|
|
|
sha1Data := tools.HmacSHA1(key, data)
|
|
return sha1Data[:tools.HmacSHA1Len]
|
|
}
|
|
|
|
func (t *tls12Ticket) sni(u string) []byte {
|
|
bURL := []byte(u)
|
|
length := len(bURL)
|
|
ret := make([]byte, length+9)
|
|
copy(ret[9:9+length], bURL)
|
|
binary.BigEndian.PutUint16(ret[7:], uint16(length&0xFFFF))
|
|
length += 3
|
|
binary.BigEndian.PutUint16(ret[4:], uint16(length&0xFFFF))
|
|
length += 2
|
|
binary.BigEndian.PutUint16(ret[2:], uint16(length&0xFFFF))
|
|
return ret
|
|
}
|
|
|
|
func (t *tls12Ticket) getHost() string {
|
|
host := t.Host
|
|
if len(t.Param) > 0 {
|
|
hosts := strings.Split(t.Param, ",")
|
|
if len(hosts) > 0 {
|
|
|
|
host = hosts[rand.Intn(len(hosts))]
|
|
host = strings.TrimSpace(host)
|
|
}
|
|
}
|
|
if len(host) > 0 && host[len(host)-1] >= byte('0') && host[len(host)-1] <= byte('9') && len(t.Param) == 0 {
|
|
host = ""
|
|
}
|
|
return host
|
|
}
|
|
|
|
func (t *tls12Ticket) packAuthData() (ret []byte) {
|
|
retSize := 32
|
|
ret = make([]byte, retSize)
|
|
|
|
now := time.Now().Unix()
|
|
binary.BigEndian.PutUint32(ret[:4], uint32(now))
|
|
|
|
rand.Read(ret[4 : 4+18])
|
|
|
|
hash := t.hmacSHA1(ret[:retSize-tools.HmacSHA1Len])
|
|
copy(ret[retSize-tools.HmacSHA1Len:], hash)
|
|
|
|
return
|
|
}
|
|
|
|
func packData(buffer *bytes.Buffer, suffix []byte) {
|
|
d := []byte{0x17, 0x3, 0x3, 0, 0}
|
|
binary.BigEndian.PutUint16(d[3:5], uint16(len(suffix)&0xFFFF))
|
|
buffer.Write(d)
|
|
buffer.Write(suffix)
|
|
}
|