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Improve: refactor ssr and fix #995 (#1189)

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Co-authored-by: goomada <madao@DESKTOP-IOEBS0C.localdomain>
This commit is contained in:
goomadao 2021-02-15 14:32:03 +08:00 committed by GitHub
parent d48cfecf60
commit 9eb98e399d
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GPG key ID: 4AEE18F83AFDEB23
23 changed files with 1667 additions and 1865 deletions
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68
adapters/outbound/shadowsocksr.go
View file

@ -12,12 +12,13 @@ import (
"github.com/Dreamacro/clash/component/ssr/protocol" "github.com/Dreamacro/clash/component/ssr/protocol"
C "github.com/Dreamacro/clash/constant" C "github.com/Dreamacro/clash/constant"
"github.com/Dreamacro/go-shadowsocks2/core" "github.com/Dreamacro/go-shadowsocks2/core"
"github.com/Dreamacro/go-shadowsocks2/shadowaead"
"github.com/Dreamacro/go-shadowsocks2/shadowstream" "github.com/Dreamacro/go-shadowsocks2/shadowstream"
) )
type ShadowSocksR struct { type ShadowSocksR struct {
*Base *Base
cipher *core.StreamCipher cipher core.Cipher
obfs obfs.Obfs obfs obfs.Obfs
protocol protocol.Protocol protocol protocol.Protocol
} }
@ -36,17 +37,22 @@ type ShadowSocksROption struct {
} }
func (ssr *ShadowSocksR) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) { func (ssr *ShadowSocksR) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
c = obfs.NewConn(c, ssr.obfs) c = ssr.obfs.StreamConn(c)
c = ssr.cipher.StreamConn(c) c = ssr.cipher.StreamConn(c)
conn, ok := c.(*shadowstream.Conn) var (
if !ok { iv []byte
err error
)
switch conn := c.(type) {
case *shadowstream.Conn:
iv, err = conn.ObtainWriteIV()
if err != nil {
return nil, err
}
case *shadowaead.Conn:
return nil, fmt.Errorf("invalid connection type") return nil, fmt.Errorf("invalid connection type")
} }
iv, err := conn.ObtainWriteIV() c = ssr.protocol.StreamConn(c, iv)
if err != nil {
return nil, err
}
c = protocol.NewConn(c, ssr.protocol, iv)
_, err = c.Write(serializesSocksAddr(metadata)) _, err = c.Write(serializesSocksAddr(metadata))
return c, err return c, err
} }
@ -74,7 +80,7 @@ func (ssr *ShadowSocksR) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
} }
pc = ssr.cipher.PacketConn(pc) pc = ssr.cipher.PacketConn(pc)
pc = protocol.NewPacketConn(pc, ssr.protocol) pc = ssr.protocol.PacketConn(pc)
return newPacketConn(&ssPacketConn{PacketConn: pc, rAddr: addr}, ssr), nil return newPacketConn(&ssPacketConn{PacketConn: pc, rAddr: addr}, ssr), nil
} }
@ -90,35 +96,43 @@ func NewShadowSocksR(option ShadowSocksROption) (*ShadowSocksR, error) {
password := option.Password password := option.Password
coreCiph, err := core.PickCipher(cipher, nil, password) coreCiph, err := core.PickCipher(cipher, nil, password)
if err != nil { if err != nil {
return nil, fmt.Errorf("ssr %s initialize cipher error: %w", addr, err) return nil, fmt.Errorf("ssr %s initialize error: %w", addr, err)
} }
ciph, ok := coreCiph.(*core.StreamCipher) var (
if !ok { ivSize int
return nil, fmt.Errorf("%s is not a supported stream cipher in ssr", cipher) key []byte
)
if option.Cipher == "dummy" {
ivSize = 0
key = core.Kdf(option.Password, 16)
} else {
ciph, ok := coreCiph.(*core.StreamCipher)
if !ok {
return nil, fmt.Errorf("%s is not dummy or a supported stream cipher in ssr", cipher)
}
ivSize = ciph.IVSize()
key = ciph.Key
} }
obfs, err := obfs.PickObfs(option.Obfs, &obfs.Base{ obfs, obfsOverhead, err := obfs.PickObfs(option.Obfs, &obfs.Base{
IVSize: ciph.IVSize(), Host: option.Server,
Key: ciph.Key, Port: option.Port,
HeadLen: 30, Key: key,
Host: option.Server, IVSize: ivSize,
Port: option.Port, Param: option.ObfsParam,
Param: option.ObfsParam,
}) })
if err != nil { if err != nil {
return nil, fmt.Errorf("ssr %s initialize obfs error: %w", addr, err) return nil, fmt.Errorf("ssr %s initialize obfs error: %w", addr, err)
} }
protocol, err := protocol.PickProtocol(option.Protocol, &protocol.Base{ protocol, err := protocol.PickProtocol(option.Protocol, &protocol.Base{
IV: nil, Key: key,
Key: ciph.Key, Overhead: obfsOverhead,
TCPMss: 1460, Param: option.ProtocolParam,
Param: option.ProtocolParam,
}) })
if err != nil { if err != nil {
return nil, fmt.Errorf("ssr %s initialize protocol error: %w", addr, err) return nil, fmt.Errorf("ssr %s initialize protocol error: %w", addr, err)
} }
protocol.SetOverhead(obfs.GetObfsOverhead() + protocol.GetProtocolOverhead())
return &ShadowSocksR{ return &ShadowSocksR{
Base: &Base{ Base: &Base{
@ -127,7 +141,7 @@ func NewShadowSocksR(option ShadowSocksROption) (*ShadowSocksR, error) {
tp: C.ShadowsocksR, tp: C.ShadowsocksR,
udp: option.UDP, udp: option.UDP,
}, },
cipher: ciph, cipher: coreCiph,
obfs: obfs, obfs: obfs,
protocol: protocol, protocol: protocol,
}, nil }, nil

12
component/ssr/obfs/base.go
View file

@ -1,11 +1,9 @@
package obfs package obfs
// Base information for obfs
type Base struct { type Base struct {
IVSize int Host string
Key []byte Port int
HeadLen int Key []byte
Host string IVSize int
Port int Param string
Param string
} }

2
component/ssr/obfs/http_post.go
View file

@ -1,7 +1,7 @@
package obfs package obfs
func init() { func init() {
register("http_post", newHTTPPost) register("http_post", newHTTPPost, 0)
} }
func newHTTPPost(b *Base) Obfs { func newHTTPPost(b *Base) Obfs {

741
component/ssr/obfs/http_simple.go
View file

@ -3,400 +3,405 @@ package obfs
import ( import (
"bytes" "bytes"
"encoding/hex" "encoding/hex"
"fmt"
"io" "io"
"math/rand" "math/rand"
"net"
"strconv"
"strings" "strings"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/component/ssr/tools"
) )
func init() {
register("http_simple", newHTTPSimple, 0)
}
type httpObfs struct { type httpObfs struct {
*Base *Base
firstRequest bool post bool
firstResponse bool
post bool
}
func init() {
register("http_simple", newHTTPSimple)
} }
func newHTTPSimple(b *Base) Obfs { func newHTTPSimple(b *Base) Obfs {
return &httpObfs{Base: b} return &httpObfs{Base: b}
} }
func (h *httpObfs) initForConn() Obfs { type httpConn struct {
return &httpObfs{ net.Conn
Base: h.Base, *httpObfs
firstRequest: true, hasSentHeader bool
firstResponse: true, hasRecvHeader bool
post: h.post, buf []byte
}
} }
func (h *httpObfs) GetObfsOverhead() int { func (h *httpObfs) StreamConn(c net.Conn) net.Conn {
return 0 return &httpConn{Conn: c, httpObfs: h}
} }
func (h *httpObfs) Decode(b []byte) ([]byte, bool, error) { func (c *httpConn) Read(b []byte) (int, error) {
if h.firstResponse { if c.buf != nil {
idx := bytes.Index(b, []byte("\r\n\r\n")) n := copy(b, c.buf)
if idx == -1 { if n == len(c.buf) {
return nil, false, io.EOF c.buf = nil
}
h.firstResponse = false
return b[idx+4:], false, nil
}
return b, false, nil
}
func (h *httpObfs) Encode(b []byte) ([]byte, error) {
if h.firstRequest {
bSize := len(b)
var headData []byte
if headSize := h.IVSize + h.HeadLen; bSize-headSize > 64 {
headData = make([]byte, headSize+rand.Intn(64))
} else { } else {
headData = make([]byte, bSize) c.buf = c.buf[n:]
} }
copy(headData, b[:len(headData)]) return n, nil
host := h.Host
var customHead string
if len(h.Param) > 0 {
customHeads := strings.Split(h.Param, "#")
if len(customHeads) > 2 {
customHeads = customHeads[:2]
}
customHosts := h.Param
if len(customHeads) > 1 {
customHosts = customHeads[0]
customHead = customHeads[1]
}
hosts := strings.Split(customHosts, ",")
if len(hosts) > 0 {
host = strings.TrimSpace(hosts[rand.Intn(len(hosts))])
}
}
method := "GET /"
if h.post {
method = "POST /"
}
requestPathIndex := rand.Intn(len(requestPath)/2) * 2
httpBuf := fmt.Sprintf("%s%s%s%s HTTP/1.1\r\nHost: %s:%d\r\n",
method,
requestPath[requestPathIndex],
data2URLEncode(headData),
requestPath[requestPathIndex+1],
host, h.Port)
if len(customHead) > 0 {
httpBuf = httpBuf + strings.Replace(customHead, "\\n", "\r\n", -1) + "\r\n\r\n"
} else {
var contentType string
if h.post {
contentType = "Content-Type: multipart/form-data; boundary=" + boundary() + "\r\n"
}
httpBuf = httpBuf + "User-agent: " + requestUserAgent[rand.Intn(len(requestUserAgent))] + "\r\n" +
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n" +
"Accept-Language: en-US,en;q=0.8\r\n" +
"Accept-Encoding: gzip, deflate\r\n" +
contentType +
"DNT: 1\r\n" +
"Connection: keep-alive\r\n" +
"\r\n"
}
var encoded []byte
if len(headData) < bSize {
encoded = make([]byte, len(httpBuf)+(bSize-len(headData)))
copy(encoded, []byte(httpBuf))
copy(encoded[len(httpBuf):], b[len(headData):])
} else {
encoded = []byte(httpBuf)
}
h.firstRequest = false
return encoded, nil
} }
return b, nil if c.hasRecvHeader {
} return c.Conn.Read(b)
func data2URLEncode(data []byte) (ret string) {
for i := 0; i < len(data); i++ {
ret = fmt.Sprintf("%s%%%s", ret, hex.EncodeToString([]byte{data[i]}))
} }
return
buf := pool.Get(pool.RelayBufferSize)
defer pool.Put(buf)
n, err := c.Conn.Read(buf)
if err != nil {
return 0, err
}
pos := bytes.Index(buf[:n], []byte("\r\n\r\n"))
if pos == -1 {
return 0, io.EOF
}
c.hasRecvHeader = true
dataLength := n - pos - 4
n = copy(b, buf[4+pos:n])
if dataLength > n {
c.buf = append(c.buf, buf[4+pos+n:4+pos+dataLength]...)
}
return n, nil
} }
func boundary() (ret string) { func (c *httpConn) Write(b []byte) (int, error) {
if c.hasSentHeader {
return c.Conn.Write(b)
}
// 30: head length
headLength := c.IVSize + 30
bLength := len(b)
headDataLength := bLength
if bLength-headLength > 64 {
headDataLength = headLength + rand.Intn(65)
}
headData := b[:headDataLength]
b = b[headDataLength:]
var body string
host := c.Host
if len(c.Param) > 0 {
pos := strings.Index(c.Param, "#")
if pos != -1 {
body = strings.ReplaceAll(c.Param[pos+1:], "\n", "\r\n")
body = strings.ReplaceAll(body, "\\n", "\r\n")
host = c.Param[:pos]
} else {
host = c.Param
}
}
hosts := strings.Split(host, ",")
host = hosts[rand.Intn(len(hosts))]
buf := tools.BufPool.Get().(*bytes.Buffer)
defer tools.BufPool.Put(buf)
defer buf.Reset()
if c.post {
buf.WriteString("POST /")
} else {
buf.WriteString("GET /")
}
packURLEncodedHeadData(buf, headData)
buf.WriteString(" HTTP/1.1\r\nHost: " + host)
if c.Port != 80 {
buf.WriteString(":" + strconv.Itoa(c.Port))
}
buf.WriteString("\r\n")
if len(body) > 0 {
buf.WriteString(body + "\r\n\r\n")
} else {
buf.WriteString("User-Agent: ")
buf.WriteString(userAgent[rand.Intn(len(userAgent))])
buf.WriteString("\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-Encoding: gzip, deflate\r\n")
if c.post {
packBoundary(buf)
}
buf.WriteString("DNT: 1\r\nConnection: keep-alive\r\n\r\n")
}
buf.Write(b)
_, err := c.Conn.Write(buf.Bytes())
if err != nil {
return 0, nil
}
c.hasSentHeader = true
return bLength, nil
}
func packURLEncodedHeadData(buf *bytes.Buffer, data []byte) {
dataLength := len(data)
for i := 0; i < dataLength; i++ {
buf.WriteRune('%')
buf.WriteString(hex.EncodeToString(data[i : i+1]))
}
}
func packBoundary(buf *bytes.Buffer) {
buf.WriteString("Content-Type: multipart/form-data; boundary=")
set := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" set := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
for i := 0; i < 32; i++ { for i := 0; i < 32; i++ {
ret = fmt.Sprintf("%s%c", ret, set[rand.Intn(len(set))]) buf.WriteByte(set[rand.Intn(62)])
} }
return buf.WriteString("\r\n")
} }
var ( var userAgent = []string{
requestPath = []string{ "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36",
"", "", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36",
"login.php?redir=", "", "Mozilla/5.0 (Linux; Android 7.0; Moto C Build/NRD90M.059) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
"register.php?code=", "", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
"?keyword=", "", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
"search?src=typd&q=", "&lang=en", "Mozilla/5.0 (Linux; Android 6.0.1; SM-G532M Build/MMB29T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36",
"s?ie=utf-8&f=8&rsv_bp=1&rsv_idx=1&ch=&bar=&wd=", "&rn=", "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
"post.php?id=", "&goto=view.php", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36",
} "Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
requestUserAgent = []string{ "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36", "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36", "Mozilla/5.0 (Linux; Android 5.1.1; SM-J120M Build/LMY47X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
"Mozilla/5.0 (Linux; Android 7.0; Moto C Build/NRD90M.059) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36", "Mozilla/5.0 (Windows NT 6.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36", "Mozilla/5.0 (Linux; Android 7.0; Moto G (5) Build/NPPS25.137-93-14) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36", "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36",
"Mozilla/5.0 (Linux; Android 6.0.1; SM-G532M Build/MMB29T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36", "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36", "Mozilla/5.0 (Linux; Android 7.0; SM-G570M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.80 Mobile Safari/537.36",
"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36", "Mozilla/5.0 (Windows NT 5.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36", "Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36", "Mozilla/5.0 (Linux; Android 6.0; CAM-L03 Build/HUAWEICAM-L03) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
"Mozilla/5.0 (Linux; Android 5.1.1; SM-J120M Build/LMY47X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.76 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36", "Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36",
"Mozilla/5.0 (Linux; Android 7.0; Moto G (5) Build/NPPS25.137-93-14) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36", "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3",
"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
"Mozilla/5.0 (Linux; Android 7.0; SM-G570M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.80 Mobile Safari/537.36", "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36",
"Mozilla/5.0 (Windows NT 5.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36", "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.7 (KHTML, like Gecko) Chrome/7.0.517.44 Safari/534.7",
"Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36",
"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75 Safari/537.36",
"Mozilla/5.0 (Linux; Android 6.0; CAM-L03 Build/HUAWEICAM-L03) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.76 Safari/537.36", "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3",
"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36", "Mozilla/5.0 (Linux; Android 8.0.0; FIG-LX3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.80 Mobile Safari/537.36",
"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36",
"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36",
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}
)

33
component/ssr/obfs/obfs.go
View file

@ -3,7 +3,7 @@ package obfs
import ( import (
"errors" "errors"
"fmt" "fmt"
"strings" "net"
) )
var ( var (
@ -12,26 +12,31 @@ var (
errTLS12TicketAuthHMACError = errors.New("tls1.2_ticket_auth hmac verifying failed") errTLS12TicketAuthHMACError = errors.New("tls1.2_ticket_auth hmac verifying failed")
) )
// Obfs provides methods for decoding and encoding type authData struct {
clientID [32]byte
}
type Obfs interface { type Obfs interface {
initForConn() Obfs StreamConn(net.Conn) net.Conn
GetObfsOverhead() int
Decode(b []byte) ([]byte, bool, error)
Encode(b []byte) ([]byte, error)
} }
type obfsCreator func(b *Base) Obfs type obfsCreator func(b *Base) Obfs
var obfsList = make(map[string]obfsCreator) var obfsList = make(map[string]struct {
overhead int
new obfsCreator
})
func register(name string, c obfsCreator) { func register(name string, c obfsCreator, o int) {
obfsList[name] = c obfsList[name] = struct {
overhead int
new obfsCreator
}{overhead: o, new: c}
} }
// PickObfs returns an obfs of the given name func PickObfs(name string, b *Base) (Obfs, int, error) {
func PickObfs(name string, b *Base) (Obfs, error) { if choice, ok := obfsList[name]; ok {
if obfsCreator, ok := obfsList[strings.ToLower(name)]; ok { return choice.new(b), choice.overhead, nil
return obfsCreator(b), nil
} }
return nil, fmt.Errorf("Obfs %s not supported", name) return nil, 0, fmt.Errorf("Obfs %s not supported", name)
} }

18
component/ssr/obfs/plain.go
View file

@ -1,25 +1,15 @@
package obfs package obfs
import "net"
type plain struct{} type plain struct{}
func init() { func init() {
register("plain", newPlain) register("plain", newPlain, 0)
} }
func newPlain(b *Base) Obfs { func newPlain(b *Base) Obfs {
return &plain{} return &plain{}
} }
func (p *plain) initForConn() Obfs { return &plain{} } func (p *plain) StreamConn(c net.Conn) net.Conn { return c }
func (p *plain) GetObfsOverhead() int {
return 0
}
func (p *plain) Encode(b []byte) ([]byte, error) {
return b, nil
}
func (p *plain) Decode(b []byte) ([]byte, bool, error) {
return b, false, nil
}

96
component/ssr/obfs/random_head.go
View file

@ -4,72 +4,68 @@ import (
"encoding/binary" "encoding/binary"
"hash/crc32" "hash/crc32"
"math/rand" "math/rand"
"net"
"github.com/Dreamacro/clash/common/pool"
) )
func init() {
register("random_head", newRandomHead, 0)
}
type randomHead struct { type randomHead struct {
*Base *Base
firstRequest bool
firstResponse bool
headerSent bool
buffer []byte
}
func init() {
register("random_head", newRandomHead)
} }
func newRandomHead(b *Base) Obfs { func newRandomHead(b *Base) Obfs {
return &randomHead{Base: b} return &randomHead{Base: b}
} }
func (r *randomHead) initForConn() Obfs { type randomHeadConn struct {
return &randomHead{ net.Conn
Base: r.Base, *randomHead
firstRequest: true, hasSentHeader bool
firstResponse: true, rawTransSent bool
} rawTransRecv bool
buf []byte
} }
func (r *randomHead) GetObfsOverhead() int { func (r *randomHead) StreamConn(c net.Conn) net.Conn {
return 0 return &randomHeadConn{Conn: c, randomHead: r}
} }
func (r *randomHead) Encode(b []byte) (encoded []byte, err error) { func (c *randomHeadConn) Read(b []byte) (int, error) {
if !r.firstRequest { if c.rawTransRecv {
return b, nil return c.Conn.Read(b)
} }
buf := pool.Get(pool.RelayBufferSize)
bSize := len(b) defer pool.Put(buf)
if r.headerSent { c.Conn.Read(buf)
if bSize > 0 { c.rawTransRecv = true
d := make([]byte, len(r.buffer)+bSize) c.Write(nil)
copy(d, r.buffer) return 0, nil
copy(d[len(r.buffer):], b)
r.buffer = d
} else {
encoded = r.buffer
r.buffer = nil
r.firstRequest = false
}
} else {
size := rand.Intn(96) + 8
encoded = make([]byte, size)
rand.Read(encoded)
crc := (0xFFFFFFFF - crc32.ChecksumIEEE(encoded[:size-4])) & 0xFFFFFFFF
binary.LittleEndian.PutUint32(encoded[size-4:], crc)
d := make([]byte, bSize)
copy(d, b)
r.buffer = d
}
r.headerSent = true
return encoded, nil
} }
func (r *randomHead) Decode(b []byte) ([]byte, bool, error) { func (c *randomHeadConn) Write(b []byte) (int, error) {
if r.firstResponse { if c.rawTransSent {
r.firstResponse = false return c.Conn.Write(b)
return b, true, nil
} }
return b, false, nil c.buf = append(c.buf, b...)
if !c.hasSentHeader {
c.hasSentHeader = true
dataLength := rand.Intn(96) + 4
buf := pool.Get(dataLength + 4)
defer pool.Put(buf)
rand.Read(buf[:dataLength])
binary.LittleEndian.PutUint32(buf[dataLength:], 0xffffffff-crc32.ChecksumIEEE(buf[:dataLength]))
_, err := c.Conn.Write(buf)
return len(b), err
}
if c.rawTransRecv {
_, err := c.Conn.Write(c.buf)
c.buf = nil
c.rawTransSent = true
return len(b), err
}
return len(b), nil
} }

72
component/ssr/obfs/stream.go
View file

@ -1,72 +0,0 @@
package obfs
import (
"net"
"github.com/Dreamacro/clash/common/pool"
)
// NewConn wraps a stream-oriented net.Conn with obfs decoding/encoding
func NewConn(c net.Conn, o Obfs) net.Conn {
return &Conn{Conn: c, Obfs: o.initForConn()}
}
// Conn represents an obfs connection
type Conn struct {
net.Conn
Obfs
buf []byte
offset int
}
func (c *Conn) Read(b []byte) (int, error) {
if c.buf != nil {
n := copy(b, c.buf[c.offset:])
c.offset += n
if c.offset == len(c.buf) {
pool.Put(c.buf)
c.buf = nil
}
return n, nil
}
buf := pool.Get(pool.RelayBufferSize)
defer pool.Put(buf)
n, err := c.Conn.Read(buf)
if err != nil {
return 0, err
}
decoded, sendback, err := c.Decode(buf[:n])
// decoded may be part of buf
decodedData := pool.Get(len(decoded))
copy(decodedData, decoded)
if err != nil {
pool.Put(decodedData)
return 0, err
}
if sendback {
c.Write(nil)
pool.Put(decodedData)
return 0, nil
}
n = copy(b, decodedData)
if len(decodedData) > len(b) {
c.buf = decodedData
c.offset = n
} else {
pool.Put(decodedData)
}
return n, err
}
func (c *Conn) Write(b []byte) (int, error) {
encoded, err := c.Encode(b)
if err != nil {
return 0, err
}
_, err = c.Conn.Write(encoded)
if err != nil {
return 0, err
}
return len(b), nil
}

231
component/ssr/obfs/tls1.2_ticket_auth.go Normal file
View file

@ -0,0 +1,231 @@
package obfs
import (
"bytes"
"crypto/hmac"
"encoding/binary"
"math/rand"
"net"
"strings"
"time"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/component/ssr/tools"
)
func init() {
register("tls1.2_ticket_auth", newTLS12Ticket, 5)
register("tls1.2_ticket_fastauth", newTLS12Ticket, 5)
}
type tls12Ticket struct {
*Base
*authData
}
func newTLS12Ticket(b *Base) Obfs {
r := &tls12Ticket{Base: b, authData: &authData{}}
rand.Read(r.clientID[:])
return r
}
type tls12TicketConn struct {
net.Conn
*tls12Ticket
handshakeStatus int
decoded bytes.Buffer
underDecoded bytes.Buffer
sendBuf bytes.Buffer
}
func (t *tls12Ticket) StreamConn(c net.Conn) net.Conn {
return &tls12TicketConn{Conn: c, tls12Ticket: t}
}
func (c *tls12TicketConn) Read(b []byte) (int, error) {
if c.decoded.Len() > 0 {
return c.decoded.Read(b)
}
buf := pool.Get(pool.RelayBufferSize)
defer pool.Put(buf)
n, err := c.Conn.Read(buf)
if err != nil {
return 0, err
}
if c.handshakeStatus == 8 {
c.underDecoded.Write(buf[:n])
for c.underDecoded.Len() > 5 {
if !bytes.Equal(c.underDecoded.Bytes()[:3], []byte{0x17, 3, 3}) {
c.underDecoded.Reset()
return 0, errTLS12TicketAuthIncorrectMagicNumber
}
size := int(binary.BigEndian.Uint16(c.underDecoded.Bytes()[3:5]))
if c.underDecoded.Len() < 5+size {
break
}
c.underDecoded.Next(5)
c.decoded.Write(c.underDecoded.Next(size))
}
n, _ = c.decoded.Read(b)
return n, nil
}
if n < 11+32+1+32 {
return 0, errTLS12TicketAuthTooShortData
}
if !hmac.Equal(buf[33:43], c.hmacSHA1(buf[11:33])[:10]) || !hmac.Equal(buf[n-10:n], c.hmacSHA1(buf[:n-10])[:10]) {
return 0, errTLS12TicketAuthHMACError
}
c.Write(nil)
return 0, nil
}
func (c *tls12TicketConn) Write(b []byte) (int, error) {
length := len(b)
if c.handshakeStatus == 8 {
buf := tools.BufPool.Get().(*bytes.Buffer)
defer tools.BufPool.Put(buf)
defer buf.Reset()
for len(b) > 2048 {
size := rand.Intn(4096) + 100
if len(b) < size {
size = len(b)
}
packData(buf, b[:size])
b = b[size:]
}
if len(b) > 0 {
packData(buf, b)
}
_, err := c.Conn.Write(buf.Bytes())
if err != nil {
return 0, err
}
return length, nil
}
if len(b) > 0 {
packData(&c.sendBuf, b)
}
if c.handshakeStatus == 0 {
c.handshakeStatus = 1
data := tools.BufPool.Get().(*bytes.Buffer)
defer tools.BufPool.Put(data)
defer data.Reset()
data.Write([]byte{3, 3})
c.packAuthData(data)
data.WriteByte(0x20)
data.Write(c.clientID[:])
data.Write([]byte{0x00, 0x1c, 0xc0, 0x2b, 0xc0, 0x2f, 0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0x14, 0xcc, 0x13, 0xc0, 0x0a, 0xc0, 0x14, 0xc0, 0x09, 0xc0, 0x13, 0x00, 0x9c, 0x00, 0x35, 0x00, 0x2f, 0x00, 0x0a})
data.Write([]byte{0x1, 0x0})
ext := tools.BufPool.Get().(*bytes.Buffer)
defer tools.BufPool.Put(ext)
defer ext.Reset()
host := c.getHost()
ext.Write([]byte{0xff, 0x01, 0x00, 0x01, 0x00})
packSNIData(ext, host)
ext.Write([]byte{0, 0x17, 0, 0})
c.packTicketBuf(ext, host)
ext.Write([]byte{0x00, 0x0d, 0x00, 0x16, 0x00, 0x14, 0x06, 0x01, 0x06, 0x03, 0x05, 0x01, 0x05, 0x03, 0x04, 0x01, 0x04, 0x03, 0x03, 0x01, 0x03, 0x03, 0x02, 0x01, 0x02, 0x03})
ext.Write([]byte{0x00, 0x05, 0x00, 0x05, 0x01, 0x00, 0x00, 0x00, 0x00})
ext.Write([]byte{0x00, 0x12, 0x00, 0x00})
ext.Write([]byte{0x75, 0x50, 0x00, 0x00})
ext.Write([]byte{0x00, 0x0b, 0x00, 0x02, 0x01, 0x00})
ext.Write([]byte{0x00, 0x0a, 0x00, 0x06, 0x00, 0x04, 0x00, 0x17, 0x00, 0x18})
binary.Write(data, binary.BigEndian, uint16(ext.Len()))
data.ReadFrom(ext)
ret := tools.BufPool.Get().(*bytes.Buffer)
defer tools.BufPool.Put(ret)
defer ret.Reset()
ret.Write([]byte{0x16, 3, 1})
binary.Write(ret, binary.BigEndian, uint16(data.Len()+4))
ret.Write([]byte{1, 0})
binary.Write(ret, binary.BigEndian, uint16(data.Len()))
ret.ReadFrom(data)
_, err := c.Conn.Write(ret.Bytes())
if err != nil {
return 0, err
}
return length, nil
} else if c.handshakeStatus == 1 && len(b) == 0 {
buf := tools.BufPool.Get().(*bytes.Buffer)
defer tools.BufPool.Put(buf)
defer buf.Reset()
buf.Write([]byte{0x14, 3, 3, 0, 1, 1, 0x16, 3, 3, 0, 0x20})
tools.AppendRandBytes(buf, 22)
buf.Write(c.hmacSHA1(buf.Bytes())[:10])
buf.ReadFrom(&c.sendBuf)
c.handshakeStatus = 8
_, err := c.Conn.Write(buf.Bytes())
return 0, err
}
return length, nil
}
func packData(buf *bytes.Buffer, data []byte) {
buf.Write([]byte{0x17, 3, 3})
binary.Write(buf, binary.BigEndian, uint16(len(data)))
buf.Write(data)
}
func (t *tls12Ticket) packAuthData(buf *bytes.Buffer) {
binary.Write(buf, binary.BigEndian, uint32(time.Now().Unix()))
tools.AppendRandBytes(buf, 18)
buf.Write(t.hmacSHA1(buf.Bytes()[buf.Len()-22:])[:10])
}
func packSNIData(buf *bytes.Buffer, u string) {
len := uint16(len(u))
buf.Write([]byte{0, 0})
binary.Write(buf, binary.BigEndian, len+5)
binary.Write(buf, binary.BigEndian, len+3)
buf.WriteByte(0)
binary.Write(buf, binary.BigEndian, len)
buf.WriteString(u)
}
func (c *tls12TicketConn) packTicketBuf(buf *bytes.Buffer, u string) {
length := 16 * (rand.Intn(17) + 8)
buf.Write([]byte{0, 0x23})
binary.Write(buf, binary.BigEndian, uint16(length))
tools.AppendRandBytes(buf, length)
}
func (t *tls12Ticket) hmacSHA1(data []byte) []byte {
key := pool.Get(len(t.Key) + 32)
defer pool.Put(key)
copy(key, t.Key)
copy(key[len(t.Key):], t.clientID[:])
sha1Data := tools.HmacSHA1(key, data)
return sha1Data[:10]
}
func (t *tls12Ticket) getHost() string {
host := t.Param
if len(host) == 0 {
host = t.Host
}
if len(host) > 0 && host[len(host)-1] >= '0' && host[len(host)-1] <= '9' {
host = ""
}
hosts := strings.Split(host, ",")
host = hosts[rand.Intn(len(hosts))]
return host
}

290
component/ssr/obfs/tls12_ticket_auth.go
View file

@ -1,290 +0,0 @@
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)
}

310
component/ssr/protocol/auth_aes128_md5.go
View file

@ -1,310 +1,18 @@
package protocol package protocol
import ( import "github.com/Dreamacro/clash/component/ssr/tools"
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"encoding/binary"
"math/rand"
"strconv"
"strings"
"time"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/component/ssr/tools"
"github.com/Dreamacro/go-shadowsocks2/core"
)
type authAES128 struct {
*Base
*recvInfo
*authData
hasSentHeader bool
packID uint32
userKey []byte
uid [4]byte
salt string
hmac hmacMethod
hashDigest hashDigestMethod
}
func init() { func init() {
register("auth_aes128_md5", newAuthAES128MD5) register("auth_aes128_md5", newAuthAES128MD5, 9)
} }
func newAuthAES128MD5(b *Base) Protocol { func newAuthAES128MD5(b *Base) Protocol {
return &authAES128{ a := &authAES128{
Base: b, Base: b,
authData: &authData{}, authData: &authData{},
salt: "auth_aes128_md5", authAES128Function: &authAES128Function{salt: "auth_aes128_md5", hmac: tools.HmacMD5, hashDigest: tools.MD5Sum},
hmac: tools.HmacMD5, userData: &userData{},
hashDigest: tools.MD5Sum,
} }
} a.initUserData()
return a
func (a *authAES128) initForConn(iv []byte) Protocol {
return &authAES128{
Base: &Base{
IV: iv,
Key: a.Key,
TCPMss: a.TCPMss,
Overhead: a.Overhead,
Param: a.Param,
},
recvInfo: &recvInfo{recvID: 1, buffer: new(bytes.Buffer)},
authData: a.authData,
packID: 1,
salt: a.salt,
hmac: a.hmac,
hashDigest: a.hashDigest,
}
}
func (a *authAES128) GetProtocolOverhead() int {
return 9
}
func (a *authAES128) SetOverhead(overhead int) {
a.Overhead = overhead
}
func (a *authAES128) Decode(b []byte) ([]byte, int, error) {
a.buffer.Reset()
bSize := len(b)
readSize := 0
key := pool.Get(len(a.userKey) + 4)
defer pool.Put(key)
copy(key, a.userKey)
for bSize > 4 {
binary.LittleEndian.PutUint32(key[len(key)-4:], a.recvID)
h := a.hmac(key, b[:2])
if !bytes.Equal(h[:2], b[2:4]) {
return nil, 0, errAuthAES128IncorrectMAC
}
length := int(binary.LittleEndian.Uint16(b[:2]))
if length >= 8192 || length < 8 {
return nil, 0, errAuthAES128DataLengthError
}
if length > bSize {
break
}
h = a.hmac(key, b[:length-4])
if !bytes.Equal(h[:4], b[length-4:length]) {
return nil, 0, errAuthAES128IncorrectChecksum
}
a.recvID++
pos := int(b[4])
if pos < 255 {
pos += 4
} else {
pos = int(binary.LittleEndian.Uint16(b[5:7])) + 4
}
if pos > length-4 {
return nil, 0, errAuthAES128PositionTooLarge
}
a.buffer.Write(b[pos : length-4])
b = b[length:]
bSize -= length
readSize += length
}
return a.buffer.Bytes(), readSize, nil
}
func (a *authAES128) Encode(b []byte) ([]byte, error) {
a.buffer.Reset()
bSize := len(b)
offset := 0
if bSize > 0 && !a.hasSentHeader {
authSize := bSize
if authSize > 1200 {
authSize = 1200
}
a.hasSentHeader = true
a.buffer.Write(a.packAuthData(b[:authSize]))
bSize -= authSize
offset += authSize
}
const blockSize = 4096
for bSize > blockSize {
packSize, randSize := a.packedDataSize(b[offset : offset+blockSize])
pack := pool.Get(packSize)
a.packData(b[offset:offset+blockSize], pack, randSize)
a.buffer.Write(pack)
pool.Put(pack)
bSize -= blockSize
offset += blockSize
}
if bSize > 0 {
packSize, randSize := a.packedDataSize(b[offset:])
pack := pool.Get(packSize)
a.packData(b[offset:], pack, randSize)
a.buffer.Write(pack)
pool.Put(pack)
}
return a.buffer.Bytes(), nil
}
func (a *authAES128) DecodePacket(b []byte) ([]byte, int, error) {
bSize := len(b)
h := a.hmac(a.Key, b[:bSize-4])
if !bytes.Equal(h[:4], b[bSize-4:]) {
return nil, 0, errAuthAES128IncorrectMAC
}
return b[:bSize-4], bSize - 4, nil
}
func (a *authAES128) EncodePacket(b []byte) ([]byte, error) {
a.initUserKeyAndID()
var buf bytes.Buffer
buf.Write(b)
buf.Write(a.uid[:])
h := a.hmac(a.userKey, buf.Bytes())
buf.Write(h[:4])
return buf.Bytes(), nil
}
func (a *authAES128) initUserKeyAndID() {
if a.userKey == nil {
params := strings.Split(a.Param, ":")
if len(params) >= 2 {
if userID, err := strconv.ParseUint(params[0], 10, 32); err == nil {
binary.LittleEndian.PutUint32(a.uid[:], uint32(userID))
a.userKey = a.hashDigest([]byte(params[1]))
}
}
if a.userKey == nil {
rand.Read(a.uid[:])
a.userKey = make([]byte, len(a.Key))
copy(a.userKey, a.Key)
}
}
}
func (a *authAES128) packedDataSize(data []byte) (packSize, randSize int) {
dataSize := len(data)
randSize = 1
if dataSize <= 1200 {
if a.packID > 4 {
randSize += rand.Intn(32)
} else {
if dataSize > 900 {
randSize += rand.Intn(128)
} else {
randSize += rand.Intn(512)
}
}
}
packSize = randSize + dataSize + 8
return
}
func (a *authAES128) packData(data, ret []byte, randSize int) {
dataSize := len(data)
retSize := len(ret)
// 0~1, ret_size
binary.LittleEndian.PutUint16(ret[0:], uint16(retSize&0xFFFF))
// 2~3, hmac
key := pool.Get(len(a.userKey) + 4)
defer pool.Put(key)
copy(key, a.userKey)
binary.LittleEndian.PutUint32(key[len(key)-4:], a.packID)
h := a.hmac(key, ret[:2])
copy(ret[2:4], h[:2])
// 4~rand_size+4, rand number
rand.Read(ret[4 : 4+randSize])
// 4, rand_size
if randSize < 128 {
ret[4] = byte(randSize & 0xFF)
} else {
// 4, magic number 0xFF
ret[4] = 0xFF
// 5~6, rand_size
binary.LittleEndian.PutUint16(ret[5:], uint16(randSize&0xFFFF))
}
// rand_size+4~ret_size-4, data
if dataSize > 0 {
copy(ret[randSize+4:], data)
}
a.packID++
h = a.hmac(key, ret[:retSize-4])
copy(ret[retSize-4:], h[:4])
}
func (a *authAES128) packAuthData(data []byte) (ret []byte) {
dataSize := len(data)
var randSize int
if dataSize > 400 {
randSize = rand.Intn(512)
} else {
randSize = rand.Intn(1024)
}
dataOffset := randSize + 16 + 4 + 4 + 7
retSize := dataOffset + dataSize + 4
ret = make([]byte, retSize)
encrypt := make([]byte, 24)
key := make([]byte, len(a.IV)+len(a.Key))
copy(key, a.IV)
copy(key[len(a.IV):], a.Key)
rand.Read(ret[dataOffset-randSize:])
a.mutex.Lock()
defer a.mutex.Unlock()
a.connectionID++
if a.connectionID > 0xFF000000 {
a.clientID = nil
}
if len(a.clientID) == 0 {
a.clientID = make([]byte, 8)
rand.Read(a.clientID)
b := make([]byte, 4)
rand.Read(b)
a.connectionID = binary.LittleEndian.Uint32(b) & 0xFFFFFF
}
copy(encrypt[4:], a.clientID)
binary.LittleEndian.PutUint32(encrypt[8:], a.connectionID)
now := time.Now().Unix()
binary.LittleEndian.PutUint32(encrypt[:4], uint32(now))
binary.LittleEndian.PutUint16(encrypt[12:], uint16(retSize&0xFFFF))
binary.LittleEndian.PutUint16(encrypt[14:], uint16(randSize&0xFFFF))
a.initUserKeyAndID()
aesCipherKey := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+a.salt, 16)
block, err := aes.NewCipher(aesCipherKey)
if err != nil {
return nil
}
encryptData := make([]byte, 16)
iv := make([]byte, aes.BlockSize)
cbc := cipher.NewCBCEncrypter(block, iv)
cbc.CryptBlocks(encryptData, encrypt[:16])
copy(encrypt[:4], a.uid[:])
copy(encrypt[4:4+16], encryptData)
h := a.hmac(key, encrypt[:20])
copy(encrypt[20:], h[:4])
rand.Read(ret[:1])
h = a.hmac(key, ret[:1])
copy(ret[1:], h[:7-1])
copy(ret[7:], encrypt)
copy(ret[dataOffset:], data)
h = a.hmac(a.userKey, ret[:retSize-4])
copy(ret[retSize-4:], h[:4])
return
} }

269
component/ssr/protocol/auth_aes128_sha1.go
View file

@ -2,21 +2,274 @@ package protocol
import ( import (
"bytes" "bytes"
"encoding/binary"
"math"
"math/rand"
"net"
"strconv"
"strings"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/component/ssr/tools" "github.com/Dreamacro/clash/component/ssr/tools"
"github.com/Dreamacro/clash/log"
) )
type hmacMethod func(key, data []byte) []byte
type hashDigestMethod func([]byte) []byte
func init() { func init() {
register("auth_aes128_sha1", newAuthAES128SHA1) register("auth_aes128_sha1", newAuthAES128SHA1, 9)
}
type authAES128Function struct {
salt string
hmac hmacMethod
hashDigest hashDigestMethod
}
type authAES128 struct {
*Base
*authData
*authAES128Function
*userData
iv []byte
hasSentHeader bool
rawTrans bool
packID uint32
recvID uint32
} }
func newAuthAES128SHA1(b *Base) Protocol { func newAuthAES128SHA1(b *Base) Protocol {
return &authAES128{ a := &authAES128{
Base: b, Base: b,
recvInfo: &recvInfo{buffer: new(bytes.Buffer)}, authData: &authData{},
authData: &authData{}, authAES128Function: &authAES128Function{salt: "auth_aes128_sha1", hmac: tools.HmacSHA1, hashDigest: tools.SHA1Sum},
salt: "auth_aes128_sha1", userData: &userData{},
hmac: tools.HmacSHA1, }
hashDigest: tools.SHA1Sum, a.initUserData()
return a
}
func (a *authAES128) initUserData() {
params := strings.Split(a.Param, ":")
if len(params) > 1 {
if userID, err := strconv.ParseUint(params[0], 10, 32); err == nil {
binary.LittleEndian.PutUint32(a.userID[:], uint32(userID))
a.userKey = a.hashDigest([]byte(params[1]))
} else {
log.Warnln("Wrong protocol-param for %s, only digits are expected before ':'", a.salt)
}
}
if len(a.userKey) == 0 {
a.userKey = a.Key
rand.Read(a.userID[:])
} }
} }
func (a *authAES128) StreamConn(c net.Conn, iv []byte) net.Conn {
p := &authAES128{
Base: a.Base,
authData: a.next(),
authAES128Function: a.authAES128Function,
userData: a.userData,
packID: 1,
recvID: 1,
}
p.iv = iv
return &Conn{Conn: c, Protocol: p}
}
func (a *authAES128) PacketConn(c net.PacketConn) net.PacketConn {
p := &authAES128{
Base: a.Base,
authAES128Function: a.authAES128Function,
userData: a.userData,
}
return &PacketConn{PacketConn: c, Protocol: p}
}
func (a *authAES128) Decode(dst, src *bytes.Buffer) error {
if a.rawTrans {
dst.ReadFrom(src)
return nil
}
for src.Len() > 4 {
macKey := pool.Get(len(a.userKey) + 4)
defer pool.Put(macKey)
copy(macKey, a.userKey)
binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.recvID)
if !bytes.Equal(a.hmac(macKey, src.Bytes()[:2])[:2], src.Bytes()[2:4]) {
src.Reset()
return errAuthAES128MACError
}
length := int(binary.LittleEndian.Uint16(src.Bytes()[:2]))
if length >= 8192 || length < 7 {
a.rawTrans = true
src.Reset()
return errAuthAES128LengthError
}
if length > src.Len() {
break
}
if !bytes.Equal(a.hmac(macKey, src.Bytes()[:length-4])[:4], src.Bytes()[length-4:length]) {
a.rawTrans = true
src.Reset()
return errAuthAES128ChksumError
}
a.recvID++
pos := int(src.Bytes()[4])
if pos < 255 {
pos += 4
} else {
pos = int(binary.LittleEndian.Uint16(src.Bytes()[5:7])) + 4
}
dst.Write(src.Bytes()[pos : length-4])
src.Next(length)
}
return nil
}
func (a *authAES128) Encode(buf *bytes.Buffer, b []byte) error {
fullDataLength := len(b)
if !a.hasSentHeader {
dataLength := getDataLength(b)
a.packAuthData(buf, b[:dataLength])
b = b[dataLength:]
a.hasSentHeader = true
}
for len(b) > 8100 {
a.packData(buf, b[:8100], fullDataLength)
b = b[8100:]
}
if len(b) > 0 {
a.packData(buf, b, fullDataLength)
}
return nil
}
func (a *authAES128) DecodePacket(b []byte) ([]byte, error) {
if !bytes.Equal(a.hmac(a.Key, b[:len(b)-4])[:4], b[len(b)-4:]) {
return nil, errAuthAES128ChksumError
}
return b[:len(b)-4], nil
}
func (a *authAES128) EncodePacket(buf *bytes.Buffer, b []byte) error {
buf.Write(b)
buf.Write(a.userID[:])
buf.Write(a.hmac(a.userKey, buf.Bytes())[:4])
return nil
}
func (a *authAES128) packData(poolBuf *bytes.Buffer, data []byte, fullDataLength int) {
dataLength := len(data)
randDataLength := a.getRandDataLengthForPackData(dataLength, fullDataLength)
/*
2: uint16 LittleEndian packedDataLength
2: hmac of packedDataLength
3: maxRandDataLengthPrefix (min:1)
4: hmac of packedData except the last 4 bytes
*/
packedDataLength := 2 + 2 + 3 + randDataLength + dataLength + 4
if randDataLength < 128 {
packedDataLength -= 2
}
macKey := pool.Get(len(a.userKey) + 4)
defer pool.Put(macKey)
copy(macKey, a.userKey)
binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.packID)
a.packID++
binary.Write(poolBuf, binary.LittleEndian, uint16(packedDataLength))
poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[poolBuf.Len()-2:])[:2])
a.packRandData(poolBuf, randDataLength)
poolBuf.Write(data)
poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[poolBuf.Len()-packedDataLength+4:])[:4])
}
func trapezoidRandom(max int, d float64) int {
base := rand.Float64()
if d-0 > 1e-6 {
a := 1 - d
base = (math.Sqrt(a*a+4*d*base) - a) / (2 * d)
}
return int(base * float64(max))
}
func (a *authAES128) getRandDataLengthForPackData(dataLength, fullDataLength int) int {
if fullDataLength >= 32*1024-a.Overhead {
return 0
}
// 1460: tcp_mss
revLength := 1460 - dataLength - 9
if revLength == 0 {
return 0
}
if revLength < 0 {
if revLength > -1460 {
return trapezoidRandom(revLength+1460, -0.3)
}
return rand.Intn(32)
}
if dataLength > 900 {
return rand.Intn(revLength)
}
return trapezoidRandom(revLength, -0.3)
}
func (a *authAES128) packAuthData(poolBuf *bytes.Buffer, data []byte) {
if len(data) == 0 {
return
}
dataLength := len(data)
randDataLength := a.getRandDataLengthForPackAuthData(dataLength)
/*
7: checkHead(1) and hmac of checkHead(6)
4: userID
16: encrypted data of authdata(12), uint16 BigEndian packedDataLength(2) and uint16 BigEndian randDataLength(2)
4: hmac of userID and encrypted data
4: hmac of packedAuthData except the last 4 bytes
*/
packedAuthDataLength := 7 + 4 + 16 + 4 + randDataLength + dataLength + 4
macKey := pool.Get(len(a.iv) + len(a.Key))
defer pool.Put(macKey)
copy(macKey, a.iv)
copy(macKey[len(a.iv):], a.Key)
poolBuf.WriteByte(byte(rand.Intn(256)))
poolBuf.Write(a.hmac(macKey, poolBuf.Bytes())[:6])
poolBuf.Write(a.userID[:])
err := a.authData.putEncryptedData(poolBuf, a.userKey, [2]int{packedAuthDataLength, randDataLength}, a.salt)
if err != nil {
poolBuf.Reset()
return
}
poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[7:])[:4])
tools.AppendRandBytes(poolBuf, randDataLength)
poolBuf.Write(data)
poolBuf.Write(a.hmac(a.userKey, poolBuf.Bytes())[:4])
}
func (a *authAES128) getRandDataLengthForPackAuthData(size int) int {
if size > 400 {
return rand.Intn(512)
}
return rand.Intn(1024)
}
func (a *authAES128) packRandData(poolBuf *bytes.Buffer, size int) {
if size < 128 {
poolBuf.WriteByte(byte(size + 1))
tools.AppendRandBytes(poolBuf, size)
return
}
poolBuf.WriteByte(255)
binary.Write(poolBuf, binary.LittleEndian, uint16(size+3))
tools.AppendRandBytes(poolBuf, size)
}

590
component/ssr/protocol/auth_chain_a.go
View file

@ -2,430 +2,308 @@ package protocol
import ( import (
"bytes" "bytes"
"crypto/aes"
"crypto/cipher" "crypto/cipher"
"crypto/rand"
"crypto/rc4" "crypto/rc4"
"encoding/base64" "encoding/base64"
"encoding/binary" "encoding/binary"
"math/rand" "net"
"strconv" "strconv"
"strings" "strings"
"time"
"github.com/Dreamacro/clash/common/pool" "github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/component/ssr/tools" "github.com/Dreamacro/clash/component/ssr/tools"
"github.com/Dreamacro/clash/log"
"github.com/Dreamacro/go-shadowsocks2/core" "github.com/Dreamacro/go-shadowsocks2/core"
) )
type authChain struct { func init() {
*Base register("auth_chain_a", newAuthChainA, 4)
*recvInfo
*authData
randomClient shift128PlusContext
randomServer shift128PlusContext
enc cipher.Stream
dec cipher.Stream
headerSent bool
lastClientHash []byte
lastServerHash []byte
userKey []byte
uid [4]byte
salt string
hmac hmacMethod
hashDigest hashDigestMethod
rnd rndMethod
dataSizeList []int
dataSizeList2 []int
chunkID uint32
} }
func init() { type randDataLengthMethod func(int, []byte, *tools.XorShift128Plus) int
register("auth_chain_a", newAuthChainA)
type authChainA struct {
*Base
*authData
*userData
iv []byte
salt string
hasSentHeader bool
rawTrans bool
lastClientHash []byte
lastServerHash []byte
encrypter cipher.Stream
decrypter cipher.Stream
randomClient tools.XorShift128Plus
randomServer tools.XorShift128Plus
randDataLength randDataLengthMethod
packID uint32
recvID uint32
} }
func newAuthChainA(b *Base) Protocol { func newAuthChainA(b *Base) Protocol {
return &authChain{ a := &authChainA{
Base: b, Base: b,
authData: &authData{}, authData: &authData{},
salt: "auth_chain_a", userData: &userData{},
hmac: tools.HmacMD5, salt: "auth_chain_a",
hashDigest: tools.SHA1Sum,
rnd: authChainAGetRandLen,
} }
a.initUserData()
return a
} }
func (a *authChain) initForConn(iv []byte) Protocol { func (a *authChainA) initUserData() {
r := &authChain{ params := strings.Split(a.Param, ":")
Base: &Base{ if len(params) > 1 {
IV: iv, if userID, err := strconv.ParseUint(params[0], 10, 32); err == nil {
Key: a.Key, binary.LittleEndian.PutUint32(a.userID[:], uint32(userID))
TCPMss: a.TCPMss, a.userKey = []byte(params[1])
Overhead: a.Overhead, } else {
Param: a.Param, log.Warnln("Wrong protocol-param for %s, only digits are expected before ':'", a.salt)
},
recvInfo: &recvInfo{recvID: 1, buffer: new(bytes.Buffer)},
authData: a.authData,
salt: a.salt,
hmac: a.hmac,
hashDigest: a.hashDigest,
rnd: a.rnd,
}
if r.salt == "auth_chain_b" {
initDataSize(r)
}
return r
}
func (a *authChain) GetProtocolOverhead() int {
return 4
}
func (a *authChain) SetOverhead(overhead int) {
a.Overhead = overhead
}
func (a *authChain) Decode(b []byte) ([]byte, int, error) {
a.buffer.Reset()
key := pool.Get(len(a.userKey) + 4)
defer pool.Put(key)
readSize := 0
copy(key, a.userKey)
for len(b) > 4 {
binary.LittleEndian.PutUint32(key[len(a.userKey):], a.recvID)
dataLen := (int)((uint(b[1]^a.lastServerHash[15]) << 8) + uint(b[0]^a.lastServerHash[14]))
randLen := a.getServerRandLen(dataLen, a.Overhead)
length := randLen + dataLen
if length >= 4096 {
return nil, 0, errAuthChainDataLengthError
} }
length += 4 }
if length > len(b) { if len(a.userKey) == 0 {
a.userKey = a.Key
rand.Read(a.userID[:])
}
}
func (a *authChainA) StreamConn(c net.Conn, iv []byte) net.Conn {
p := &authChainA{
Base: a.Base,
authData: a.next(),
userData: a.userData,
salt: a.salt,
packID: 1,
recvID: 1,
}
p.iv = iv
p.randDataLength = p.getRandLength
return &Conn{Conn: c, Protocol: p}
}
func (a *authChainA) PacketConn(c net.PacketConn) net.PacketConn {
p := &authChainA{
Base: a.Base,
salt: a.salt,
userData: a.userData,
}
return &PacketConn{PacketConn: c, Protocol: p}
}
func (a *authChainA) Decode(dst, src *bytes.Buffer) error {
if a.rawTrans {
dst.ReadFrom(src)
return nil
}
for src.Len() > 4 {
macKey := pool.Get(len(a.userKey) + 4)
defer pool.Put(macKey)
copy(macKey, a.userKey)
binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.recvID)
dataLength := int(binary.LittleEndian.Uint16(src.Bytes()[:2]) ^ binary.LittleEndian.Uint16(a.lastServerHash[14:16]))
randDataLength := a.randDataLength(dataLength, a.lastServerHash, &a.randomServer)
length := dataLength + randDataLength
if length >= 4096 {
a.rawTrans = true
src.Reset()
return errAuthChainLengthError
}
if 4+length > src.Len() {
break break
} }
hash := a.hmac(key, b[:length-2]) serverHash := tools.HmacMD5(macKey, src.Bytes()[:length+2])
if !bytes.Equal(hash[:2], b[length-2:length]) { if !bytes.Equal(serverHash[:2], src.Bytes()[length+2:length+4]) {
return nil, 0, errAuthChainHMACError a.rawTrans = true
src.Reset()
return errAuthChainChksumError
} }
var dataPos int a.lastServerHash = serverHash
if dataLen > 0 && randLen > 0 {
dataPos = 2 + getRandStartPos(&a.randomServer, randLen) pos := 2
} else { if dataLength > 0 && randDataLength > 0 {
dataPos = 2 pos += getRandStartPos(randDataLength, &a.randomServer)
} }
d := pool.Get(dataLen) wantedData := src.Bytes()[pos : pos+dataLength]
a.dec.XORKeyStream(d, b[dataPos:dataPos+dataLen]) a.decrypter.XORKeyStream(wantedData, wantedData)
a.buffer.Write(d)
pool.Put(d)
if a.recvID == 1 { if a.recvID == 1 {
a.TCPMss = int(binary.LittleEndian.Uint16(a.buffer.Next(2))) dst.Write(wantedData[2:])
} else {
dst.Write(wantedData)
} }
a.lastServerHash = hash
a.recvID++ a.recvID++
b = b[length:] src.Next(length + 4)
readSize += length
} }
return a.buffer.Bytes(), readSize, nil return nil
} }
func (a *authChain) Encode(b []byte) ([]byte, error) { func (a *authChainA) Encode(buf *bytes.Buffer, b []byte) error {
a.buffer.Reset() if !a.hasSentHeader {
bSize := len(b) dataLength := getDataLength(b)
offset := 0 a.packAuthData(buf, b[:dataLength])
if bSize > 0 && !a.headerSent { b = b[dataLength:]
headSize := 1200 a.hasSentHeader = true
if headSize > bSize {
headSize = bSize
}
a.buffer.Write(a.packAuthData(b[:headSize]))
offset += headSize
bSize -= headSize
a.headerSent = true
} }
var unitSize = a.TCPMss - a.Overhead for len(b) > 2800 {
for bSize > unitSize { a.packData(buf, b[:2800])
dataLen, randLength := a.packedDataLen(b[offset : offset+unitSize]) b = b[2800:]
d := pool.Get(dataLen)
a.packData(d, b[offset:offset+unitSize], randLength)
a.buffer.Write(d)
pool.Put(d)
bSize -= unitSize
offset += unitSize
} }
if bSize > 0 { if len(b) > 0 {
dataLen, randLength := a.packedDataLen(b[offset:]) a.packData(buf, b)
d := pool.Get(dataLen)
a.packData(d, b[offset:], randLength)
a.buffer.Write(d)
pool.Put(d)
} }
return a.buffer.Bytes(), nil return nil
} }
func (a *authChain) DecodePacket(b []byte) ([]byte, int, error) { func (a *authChainA) DecodePacket(b []byte) ([]byte, error) {
bSize := len(b) if len(b) < 9 {
if bSize < 9 { return nil, errAuthChainLengthError
return nil, 0, errAuthChainDataLengthError
} }
h := a.hmac(a.userKey, b[:bSize-1]) if !bytes.Equal(tools.HmacMD5(a.userKey, b[:len(b)-1])[:1], b[len(b)-1:]) {
if h[0] != b[bSize-1] { return nil, errAuthChainChksumError
return nil, 0, errAuthChainHMACError
} }
hash := a.hmac(a.Key, b[bSize-8:bSize-1]) md5Data := tools.HmacMD5(a.Key, b[len(b)-8:len(b)-1])
cipherKey := a.getRC4CipherKey(hash)
dec, _ := rc4.NewCipher(cipherKey) randDataLength := udpGetRandLength(md5Data, &a.randomServer)
randLength := udpGetRandLen(&a.randomServer, hash)
bSize -= 8 + randLength key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(md5Data), 16)
dec.XORKeyStream(b, b[:bSize]) rc4Cipher, err := rc4.NewCipher(key)
return b, bSize, nil if err != nil {
return nil, err
}
wantedData := b[:len(b)-8-randDataLength]
rc4Cipher.XORKeyStream(wantedData, wantedData)
return wantedData, nil
} }
func (a *authChain) EncodePacket(b []byte) ([]byte, error) { func (a *authChainA) EncodePacket(buf *bytes.Buffer, b []byte) error {
a.initUserKeyAndID()
authData := pool.Get(3) authData := pool.Get(3)
defer pool.Put(authData) defer pool.Put(authData)
rand.Read(authData) rand.Read(authData)
hash := a.hmac(a.Key, authData)
uid := pool.Get(4)
defer pool.Put(uid)
for i := 0; i < 4; i++ {
uid[i] = a.uid[i] ^ hash[i]
}
cipherKey := a.getRC4CipherKey(hash) md5Data := tools.HmacMD5(a.Key, authData)
enc, _ := rc4.NewCipher(cipherKey)
var buf bytes.Buffer randDataLength := udpGetRandLength(md5Data, &a.randomClient)
enc.XORKeyStream(b, b)
key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(md5Data), 16)
rc4Cipher, err := rc4.NewCipher(key)
if err != nil {
return err
}
rc4Cipher.XORKeyStream(b, b)
buf.Write(b) buf.Write(b)
tools.AppendRandBytes(buf, randDataLength)
randLength := udpGetRandLen(&a.randomClient, hash)
randBytes := pool.Get(randLength)
defer pool.Put(randBytes)
buf.Write(randBytes)
buf.Write(authData) buf.Write(authData)
buf.Write(uid) binary.Write(buf, binary.LittleEndian, binary.LittleEndian.Uint32(a.userID[:])^binary.LittleEndian.Uint32(md5Data[:4]))
buf.Write(tools.HmacMD5(a.userKey, buf.Bytes())[:1])
h := a.hmac(a.userKey, buf.Bytes()) return nil
buf.Write(h[:1])
return buf.Bytes(), nil
} }
func (a *authChain) getRC4CipherKey(hash []byte) []byte { func (a *authChainA) packAuthData(poolBuf *bytes.Buffer, data []byte) {
base64UserKey := base64.StdEncoding.EncodeToString(a.userKey) /*
return a.calcRC4CipherKey(hash, base64UserKey) dataLength := len(data)
} 12: checkHead(4) and hmac of checkHead(8)
4: uint32 LittleEndian uid (uid = userID ^ last client hash)
16: encrypted data of authdata(12), uint16 LittleEndian overhead(2) and uint16 LittleEndian number zero(2)
4: last server hash(4)
packedAuthDataLength := 12 + 4 + 16 + 4 + dataLength
*/
func (a *authChain) calcRC4CipherKey(hash []byte, base64UserKey string) []byte { macKey := pool.Get(len(a.iv) + len(a.Key))
password := pool.Get(len(base64UserKey) + base64.StdEncoding.EncodedLen(16)) defer pool.Put(macKey)
defer pool.Put(password) copy(macKey, a.iv)
copy(password, base64UserKey) copy(macKey[len(a.iv):], a.Key)
base64.StdEncoding.Encode(password[len(base64UserKey):], hash[:16])
return core.Kdf(string(password), 16)
}
func (a *authChain) initUserKeyAndID() { // check head
if a.userKey == nil { tools.AppendRandBytes(poolBuf, 4)
params := strings.Split(a.Param, ":") a.lastClientHash = tools.HmacMD5(macKey, poolBuf.Bytes())
if len(params) >= 2 { a.initRC4Cipher()
if userID, err := strconv.ParseUint(params[0], 10, 32); err == nil { poolBuf.Write(a.lastClientHash[:8])
binary.LittleEndian.PutUint32(a.uid[:], uint32(userID)) // uid
a.userKey = []byte(params[1]) binary.Write(poolBuf, binary.LittleEndian, binary.LittleEndian.Uint32(a.userID[:])^binary.LittleEndian.Uint32(a.lastClientHash[8:12]))
} // encrypted data
} err := a.putEncryptedData(poolBuf, a.userKey, [2]int{a.Overhead, 0}, a.salt)
if err != nil {
if a.userKey == nil { poolBuf.Reset()
rand.Read(a.uid[:]) return
a.userKey = make([]byte, len(a.Key))
copy(a.userKey, a.Key)
}
} }
// last server hash
a.lastServerHash = tools.HmacMD5(a.userKey, poolBuf.Bytes()[12:])
poolBuf.Write(a.lastServerHash[:4])
// packed data
a.packData(poolBuf, data)
} }
func (a *authChain) getClientRandLen(dataLength int, overhead int) int { func (a *authChainA) packData(poolBuf *bytes.Buffer, data []byte) {
return a.rnd(dataLength, &a.randomClient, a.lastClientHash, a.dataSizeList, a.dataSizeList2, overhead) a.encrypter.XORKeyStream(data, data)
macKey := pool.Get(len(a.userKey) + 4)
defer pool.Put(macKey)
copy(macKey, a.userKey)
binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.packID)
a.packID++
length := uint16(len(data)) ^ binary.LittleEndian.Uint16(a.lastClientHash[14:16])
originalLength := poolBuf.Len()
binary.Write(poolBuf, binary.LittleEndian, length)
a.putMixedRandDataAndData(poolBuf, data)
a.lastClientHash = tools.HmacMD5(macKey, poolBuf.Bytes()[originalLength:])
poolBuf.Write(a.lastClientHash[:2])
} }
func (a *authChain) getServerRandLen(dataLength int, overhead int) int { func (a *authChainA) putMixedRandDataAndData(poolBuf *bytes.Buffer, data []byte) {
return a.rnd(dataLength, &a.randomServer, a.lastServerHash, a.dataSizeList, a.dataSizeList2, overhead) randDataLength := a.randDataLength(len(data), a.lastClientHash, &a.randomClient)
if len(data) == 0 {
tools.AppendRandBytes(poolBuf, randDataLength)
return
}
if randDataLength > 0 {
startPos := getRandStartPos(randDataLength, &a.randomClient)
tools.AppendRandBytes(poolBuf, startPos)
poolBuf.Write(data)
tools.AppendRandBytes(poolBuf, randDataLength-startPos)
return
}
poolBuf.Write(data)
} }
func (a *authChain) packedDataLen(data []byte) (chunkLength, randLength int) { func getRandStartPos(length int, random *tools.XorShift128Plus) int {
dataLength := len(data) if length == 0 {
randLength = a.getClientRandLen(dataLength, a.Overhead)
chunkLength = randLength + dataLength + 2 + 2
return
}
func (a *authChain) packData(outData []byte, data []byte, randLength int) {
dataLength := len(data)
outLength := randLength + dataLength + 2
outData[0] = byte(dataLength) ^ a.lastClientHash[14]
outData[1] = byte(dataLength>>8) ^ a.lastClientHash[15]
{
if dataLength > 0 {
randPart1Length := getRandStartPos(&a.randomClient, randLength)
rand.Read(outData[2 : 2+randPart1Length])
a.enc.XORKeyStream(outData[2+randPart1Length:], data)
rand.Read(outData[2+randPart1Length+dataLength : outLength])
} else {
rand.Read(outData[2 : 2+randLength])
}
}
userKeyLen := uint8(len(a.userKey))
key := pool.Get(int(userKeyLen + 4))
defer pool.Put(key)
copy(key, a.userKey)
a.chunkID++
binary.LittleEndian.PutUint32(key[userKeyLen:], a.chunkID)
a.lastClientHash = a.hmac(key, outData[:outLength])
copy(outData[outLength:], a.lastClientHash[:2])
}
const authHeadLength = 4 + 8 + 4 + 16 + 4
func (a *authChain) packAuthData(data []byte) (outData []byte) {
outData = make([]byte, authHeadLength, authHeadLength+1500)
a.mutex.Lock()
defer a.mutex.Unlock()
a.connectionID++
if a.connectionID > 0xFF000000 {
a.clientID = nil
}
if len(a.clientID) == 0 {
a.clientID = make([]byte, 4)
rand.Read(a.clientID)
b := make([]byte, 4)
rand.Read(b)
a.connectionID = binary.LittleEndian.Uint32(b) & 0xFFFFFF
}
var key = make([]byte, len(a.IV)+len(a.Key))
copy(key, a.IV)
copy(key[len(a.IV):], a.Key)
encrypt := make([]byte, 20)
t := time.Now().Unix()
binary.LittleEndian.PutUint32(encrypt[:4], uint32(t))
copy(encrypt[4:8], a.clientID)
binary.LittleEndian.PutUint32(encrypt[8:], a.connectionID)
binary.LittleEndian.PutUint16(encrypt[12:], uint16(a.Overhead))
binary.LittleEndian.PutUint16(encrypt[14:], 0)
// first 12 bytes
{
rand.Read(outData[:4])
a.lastClientHash = a.hmac(key, outData[:4])
copy(outData[4:], a.lastClientHash[:8])
}
var base64UserKey string
// uid & 16 bytes auth data
{
a.initUserKeyAndID()
uid := make([]byte, 4)
for i := 0; i < 4; i++ {
uid[i] = a.uid[i] ^ a.lastClientHash[8+i]
}
base64UserKey = base64.StdEncoding.EncodeToString(a.userKey)
aesCipherKey := core.Kdf(base64UserKey+a.salt, 16)
block, err := aes.NewCipher(aesCipherKey)
if err != nil {
return
}
encryptData := make([]byte, 16)
iv := make([]byte, aes.BlockSize)
cbc := cipher.NewCBCEncrypter(block, iv)
cbc.CryptBlocks(encryptData, encrypt[:16])
copy(encrypt[:4], uid[:])
copy(encrypt[4:4+16], encryptData)
}
// final HMAC
{
a.lastServerHash = a.hmac(a.userKey, encrypt[:20])
copy(outData[12:], encrypt)
copy(outData[12+20:], a.lastServerHash[:4])
}
// init cipher
cipherKey := a.calcRC4CipherKey(a.lastClientHash, base64UserKey)
a.enc, _ = rc4.NewCipher(cipherKey)
a.dec, _ = rc4.NewCipher(cipherKey)
// data
chunkLength, randLength := a.packedDataLen(data)
if chunkLength+authHeadLength <= cap(outData) {
outData = outData[:authHeadLength+chunkLength]
} else {
newOutData := make([]byte, authHeadLength+chunkLength)
copy(newOutData, outData[:authHeadLength])
outData = newOutData
}
a.packData(outData[authHeadLength:], data, randLength)
return
}
func getRandStartPos(random *shift128PlusContext, randLength int) int {
if randLength > 0 {
return int(random.Next() % 8589934609 % uint64(randLength))
}
return 0
}
func authChainAGetRandLen(dataLength int, random *shift128PlusContext, lastHash []byte, dataSizeList, dataSizeList2 []int, overhead int) int {
if dataLength > 1440 {
return 0 return 0
} }
random.InitFromBinDatalen(lastHash[:16], dataLength) return int(random.Next()%8589934609) % length
if dataLength > 1300 { }
func (a *authChainA) getRandLength(length int, lastHash []byte, random *tools.XorShift128Plus) int {
if length > 1440 {
return 0
}
random.InitFromBinAndLength(lastHash, length)
if length > 1300 {
return int(random.Next() % 31) return int(random.Next() % 31)
} }
if dataLength > 900 { if length > 900 {
return int(random.Next() % 127) return int(random.Next() % 127)
} }
if dataLength > 400 { if length > 400 {
return int(random.Next() % 521) return int(random.Next() % 521)
} }
return int(random.Next() % 1021) return int(random.Next() % 1021)
} }
func udpGetRandLen(random *shift128PlusContext, lastHash []byte) int { func (a *authChainA) initRC4Cipher() {
random.InitFromBin(lastHash[:16]) key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(a.lastClientHash), 16)
a.encrypter, _ = rc4.NewCipher(key)
a.decrypter, _ = rc4.NewCipher(key)
}
func udpGetRandLength(lastHash []byte, random *tools.XorShift128Plus) int {
random.InitFromBin(lastHash)
return int(random.Next() % 127) return int(random.Next() % 127)
} }
type shift128PlusContext struct {
v [2]uint64
}
func (ctx *shift128PlusContext) InitFromBin(bin []byte) {
var fillBin [16]byte
copy(fillBin[:], bin)
ctx.v[0] = binary.LittleEndian.Uint64(fillBin[:8])
ctx.v[1] = binary.LittleEndian.Uint64(fillBin[8:])
}
func (ctx *shift128PlusContext) InitFromBinDatalen(bin []byte, datalen int) {
var fillBin [16]byte
copy(fillBin[:], bin)
binary.LittleEndian.PutUint16(fillBin[:2], uint16(datalen))
ctx.v[0] = binary.LittleEndian.Uint64(fillBin[:8])
ctx.v[1] = binary.LittleEndian.Uint64(fillBin[8:])
for i := 0; i < 4; i++ {
ctx.Next()
}
}
func (ctx *shift128PlusContext) Next() uint64 {
x := ctx.v[0]
y := ctx.v[1]
ctx.v[0] = y
x ^= x << 23
x ^= y ^ (x >> 17) ^ (y >> 26)
ctx.v[1] = x
return x + y
}

103
component/ssr/protocol/auth_chain_b.go
View file

@ -1,71 +1,96 @@
package protocol package protocol
import ( import (
"net"
"sort" "sort"
"github.com/Dreamacro/clash/component/ssr/tools" "github.com/Dreamacro/clash/component/ssr/tools"
) )
func init() { func init() {
register("auth_chain_b", newAuthChainB) register("auth_chain_b", newAuthChainB, 4)
}
type authChainB struct {
*authChainA
dataSizeList []int
dataSizeList2 []int
} }
func newAuthChainB(b *Base) Protocol { func newAuthChainB(b *Base) Protocol {
return &authChain{ a := &authChainB{
Base: b, authChainA: &authChainA{
authData: &authData{}, Base: b,
salt: "auth_chain_b", authData: &authData{},
hmac: tools.HmacMD5, userData: &userData{},
hashDigest: tools.SHA1Sum, salt: "auth_chain_b",
rnd: authChainBGetRandLen, },
} }
a.initUserData()
return a
} }
func initDataSize(r *authChain) { func (a *authChainB) StreamConn(c net.Conn, iv []byte) net.Conn {
random := &r.randomServer p := &authChainB{
random.InitFromBin(r.Key) authChainA: &authChainA{
len := random.Next()%8 + 4 Base: a.Base,
r.dataSizeList = make([]int, len) authData: a.next(),
for i := 0; i < int(len); i++ { userData: a.userData,
r.dataSizeList[i] = int(random.Next() % 2340 % 2040 % 1440) salt: a.salt,
packID: 1,
recvID: 1,
},
} }
sort.Ints(r.dataSizeList) p.iv = iv
p.randDataLength = p.getRandLength
len = random.Next()%16 + 8 p.initDataSize()
r.dataSizeList2 = make([]int, len) return &Conn{Conn: c, Protocol: p}
for i := 0; i < int(len); i++ {
r.dataSizeList2[i] = int(random.Next() % 2340 % 2040 % 1440)
}
sort.Ints(r.dataSizeList2)
} }
func authChainBGetRandLen(dataLength int, random *shift128PlusContext, lastHash []byte, dataSizeList, dataSizeList2 []int, overhead int) int { func (a *authChainB) initDataSize() {
if dataLength > 1440 { a.dataSizeList = a.dataSizeList[:0]
a.dataSizeList2 = a.dataSizeList2[:0]
a.randomServer.InitFromBin(a.Key)
length := a.randomServer.Next()%8 + 4
for ; length > 0; length-- {
a.dataSizeList = append(a.dataSizeList, int(a.randomServer.Next()%2340%2040%1440))
}
sort.Ints(a.dataSizeList)
length = a.randomServer.Next()%16 + 8
for ; length > 0; length-- {
a.dataSizeList2 = append(a.dataSizeList2, int(a.randomServer.Next()%2340%2040%1440))
}
sort.Ints(a.dataSizeList2)
}
func (a *authChainB) getRandLength(length int, lashHash []byte, random *tools.XorShift128Plus) int {
if length >= 1440 {
return 0 return 0
} }
random.InitFromBinDatalen(lastHash[:16], dataLength) random.InitFromBinAndLength(lashHash, length)
pos := sort.Search(len(dataSizeList), func(i int) bool { return dataSizeList[i] > dataLength+overhead }) pos := sort.Search(len(a.dataSizeList), func(i int) bool { return a.dataSizeList[i] >= length+a.Overhead })
finalPos := uint64(pos) + random.Next()%uint64(len(dataSizeList)) finalPos := pos + int(random.Next()%uint64(len(a.dataSizeList)))
if finalPos < uint64(len(dataSizeList)) { if finalPos < len(a.dataSizeList) {
return dataSizeList[finalPos] - dataLength - overhead return a.dataSizeList[finalPos] - length - a.Overhead
} }
pos = sort.Search(len(dataSizeList2), func(i int) bool { return dataSizeList2[i] > dataLength+overhead }) pos = sort.Search(len(a.dataSizeList2), func(i int) bool { return a.dataSizeList2[i] >= length+a.Overhead })
finalPos = uint64(pos) + random.Next()%uint64(len(dataSizeList2)) finalPos = pos + int(random.Next()%uint64(len(a.dataSizeList2)))
if finalPos < uint64(len(dataSizeList2)) { if finalPos < len(a.dataSizeList2) {
return dataSizeList2[finalPos] - dataLength - overhead return a.dataSizeList2[finalPos] - length - a.Overhead
} }
if finalPos < uint64(pos+len(dataSizeList2)-1) { if finalPos < pos+len(a.dataSizeList2)-1 {
return 0 return 0
} }
if length > 1300 {
if dataLength > 1300 {
return int(random.Next() % 31) return int(random.Next() % 31)
} }
if dataLength > 900 { if length > 900 {
return int(random.Next() % 127) return int(random.Next() % 127)
} }
if dataLength > 400 { if length > 400 {
return int(random.Next() % 521) return int(random.Next() % 521)
} }
return int(random.Next() % 1021) return int(random.Next() % 1021)

329
component/ssr/protocol/auth_sha1_v4.go
View file

@ -6,248 +6,177 @@ import (
"hash/adler32" "hash/adler32"
"hash/crc32" "hash/crc32"
"math/rand" "math/rand"
"time" "net"
"github.com/Dreamacro/clash/common/pool" "github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/component/ssr/tools" "github.com/Dreamacro/clash/component/ssr/tools"
) )
func init() {
register("auth_sha1_v4", newAuthSHA1V4, 7)
}
type authSHA1V4 struct { type authSHA1V4 struct {
*Base *Base
*authData *authData
headerSent bool iv []byte
buffer bytes.Buffer hasSentHeader bool
} rawTrans bool
func init() {
register("auth_sha1_v4", newAuthSHA1V4)
} }
func newAuthSHA1V4(b *Base) Protocol { func newAuthSHA1V4(b *Base) Protocol {
return &authSHA1V4{Base: b, authData: &authData{}} return &authSHA1V4{Base: b, authData: &authData{}}
} }
func (a *authSHA1V4) initForConn(iv []byte) Protocol { func (a *authSHA1V4) StreamConn(c net.Conn, iv []byte) net.Conn {
return &authSHA1V4{ p := &authSHA1V4{Base: a.Base, authData: a.next()}
Base: &Base{ p.iv = iv
IV: iv, return &Conn{Conn: c, Protocol: p}
Key: a.Key, }
TCPMss: a.TCPMss,
Overhead: a.Overhead, func (a *authSHA1V4) PacketConn(c net.PacketConn) net.PacketConn {
Param: a.Param, return c
}, }
authData: a.authData,
func (a *authSHA1V4) Decode(dst, src *bytes.Buffer) error {
if a.rawTrans {
dst.ReadFrom(src)
return nil
} }
} for src.Len() > 4 {
if uint16(crc32.ChecksumIEEE(src.Bytes()[:2])&0xffff) != binary.LittleEndian.Uint16(src.Bytes()[2:4]) {
func (a *authSHA1V4) GetProtocolOverhead() int { src.Reset()
return 7 return errAuthSHA1V4CRC32Error
}
func (a *authSHA1V4) SetOverhead(overhead int) {
a.Overhead = overhead
}
func (a *authSHA1V4) Decode(b []byte) ([]byte, int, error) {
a.buffer.Reset()
bSize := len(b)
originalSize := bSize
for bSize > 4 {
crc := crc32.ChecksumIEEE(b[:2]) & 0xFFFF
if binary.LittleEndian.Uint16(b[2:4]) != uint16(crc) {
return nil, 0, errAuthSHA1v4CRC32Error
} }
length := int(binary.BigEndian.Uint16(b[:2]))
if length >= 8192 || length < 8 { length := int(binary.BigEndian.Uint16(src.Bytes()[:2]))
return nil, 0, errAuthSHA1v4DataLengthError if length >= 8192 || length < 7 {
a.rawTrans = true
src.Reset()
return errAuthSHA1V4LengthError
} }
if length > bSize { if length > src.Len() {
break break
} }
if adler32.Checksum(b[:length-4]) == binary.LittleEndian.Uint32(b[length-4:]) { if adler32.Checksum(src.Bytes()[:length-4]) != binary.LittleEndian.Uint32(src.Bytes()[length-4:length]) {
pos := int(b[4]) a.rawTrans = true
if pos != 0xFF { src.Reset()
pos += 4 return errAuthSHA1V4Adler32Error
} else { }
pos = int(binary.BigEndian.Uint16(b[5:5+2])) + 4
} pos := int(src.Bytes()[4])
retSize := length - pos - 4 if pos < 255 {
a.buffer.Write(b[pos : pos+retSize]) pos += 4
bSize -= length
b = b[length:]
} else { } else {
return nil, 0, errAuthSHA1v4IncorrectChecksum pos = int(binary.BigEndian.Uint16(src.Bytes()[5:7])) + 4
} }
dst.Write(src.Bytes()[pos : length-4])
src.Next(length)
} }
return a.buffer.Bytes(), originalSize - bSize, nil return nil
} }
func (a *authSHA1V4) Encode(b []byte) ([]byte, error) { func (a *authSHA1V4) Encode(buf *bytes.Buffer, b []byte) error {
a.buffer.Reset() if !a.hasSentHeader {
bSize := len(b) dataLength := getDataLength(b)
offset := 0
if !a.headerSent && bSize > 0 { a.packAuthData(buf, b[:dataLength])
headSize := getHeadSize(b, 30) b = b[dataLength:]
if headSize > bSize {
headSize = bSize a.hasSentHeader = true
}
a.buffer.Write(a.packAuthData(b[:headSize]))
offset += headSize
bSize -= headSize
a.headerSent = true
} }
const blockSize = 4096 for len(b) > 8100 {
for bSize > blockSize { a.packData(buf, b[:8100])
packSize, randSize := a.packedDataSize(b[offset : offset+blockSize]) b = b[8100:]
pack := pool.Get(packSize)
a.packData(b[offset:offset+blockSize], pack, randSize)
a.buffer.Write(pack)
pool.Put(pack)
offset += blockSize
bSize -= blockSize
} }
if bSize > 0 { if len(b) > 0 {
packSize, randSize := a.packedDataSize(b[offset:]) a.packData(buf, b)
pack := pool.Get(packSize)
a.packData(b[offset:], pack, randSize)
a.buffer.Write(pack)
pool.Put(pack)
} }
return a.buffer.Bytes(), nil
return nil
} }
func (a *authSHA1V4) DecodePacket(b []byte) ([]byte, int, error) { func (a *authSHA1V4) DecodePacket(b []byte) ([]byte, error) { return b, nil }
return b, len(b), nil
func (a *authSHA1V4) EncodePacket(buf *bytes.Buffer, b []byte) error {
buf.Write(b)
return nil
} }
func (a *authSHA1V4) EncodePacket(b []byte) ([]byte, error) { func (a *authSHA1V4) packData(poolBuf *bytes.Buffer, data []byte) {
return b, nil dataLength := len(data)
randDataLength := a.getRandDataLength(dataLength)
/*
2: uint16 BigEndian packedDataLength
2: uint16 LittleEndian crc32Data & 0xffff
3: maxRandDataLengthPrefix (min:1)
4: adler32Data
*/
packedDataLength := 2 + 2 + 3 + randDataLength + dataLength + 4
if randDataLength < 128 {
packedDataLength -= 2
}
binary.Write(poolBuf, binary.BigEndian, uint16(packedDataLength))
binary.Write(poolBuf, binary.LittleEndian, uint16(crc32.ChecksumIEEE(poolBuf.Bytes()[poolBuf.Len()-2:])&0xffff))
a.packRandData(poolBuf, randDataLength)
poolBuf.Write(data)
binary.Write(poolBuf, binary.LittleEndian, adler32.Checksum(poolBuf.Bytes()[poolBuf.Len()-packedDataLength+4:]))
} }
func (a *authSHA1V4) packedDataSize(data []byte) (packSize, randSize int) { func (a *authSHA1V4) packAuthData(poolBuf *bytes.Buffer, data []byte) {
dataSize := len(data) dataLength := len(data)
randSize = 1 randDataLength := a.getRandDataLength(12 + dataLength)
if dataSize <= 1300 { /*
if dataSize > 400 { 2: uint16 BigEndian packedAuthDataLength
randSize += rand.Intn(128) 4: uint32 LittleEndian crc32Data
} else { 3: maxRandDataLengthPrefix (min: 1)
randSize += rand.Intn(1024) 12: authDataLength
} 10: hmacSHA1DataLength
*/
packedAuthDataLength := 2 + 4 + 3 + randDataLength + 12 + dataLength + 10
if randDataLength < 128 {
packedAuthDataLength -= 2
} }
packSize = randSize + dataSize + 8
return
}
func (a *authSHA1V4) packData(data, ret []byte, randSize int) {
dataSize := len(data)
retSize := len(ret)
// 0~1, ret size
binary.BigEndian.PutUint16(ret[:2], uint16(retSize&0xFFFF))
// 2~3, crc of ret size
crc := crc32.ChecksumIEEE(ret[:2]) & 0xFFFF
binary.LittleEndian.PutUint16(ret[2:4], uint16(crc))
// 4, rand size
if randSize < 128 {
ret[4] = uint8(randSize & 0xFF)
} else {
ret[4] = uint8(0xFF)
binary.BigEndian.PutUint16(ret[5:7], uint16(randSize&0xFFFF))
}
// (rand size+4)~(ret size-4), data
if dataSize > 0 {
copy(ret[randSize+4:], data)
}
// (ret size-4)~end, adler32 of full data
adler := adler32.Checksum(ret[:retSize-4])
binary.LittleEndian.PutUint32(ret[retSize-4:], adler)
}
func (a *authSHA1V4) packAuthData(data []byte) (ret []byte) {
dataSize := len(data)
randSize := 1
if dataSize <= 1300 {
if dataSize > 400 {
randSize += rand.Intn(128)
} else {
randSize += rand.Intn(1024)
}
}
dataOffset := randSize + 4 + 2
retSize := dataOffset + dataSize + 12 + tools.HmacSHA1Len
ret = make([]byte, retSize)
a.mutex.Lock()
defer a.mutex.Unlock()
a.connectionID++
if a.connectionID > 0xFF000000 {
a.clientID = nil
}
if len(a.clientID) == 0 {
a.clientID = make([]byte, 8)
rand.Read(a.clientID)
b := make([]byte, 4)
rand.Read(b)
a.connectionID = binary.LittleEndian.Uint32(b) & 0xFFFFFF
}
// 0~1, ret size
binary.BigEndian.PutUint16(ret[:2], uint16(retSize&0xFFFF))
// 2~6, crc of (ret size+salt+key)
salt := []byte("auth_sha1_v4") salt := []byte("auth_sha1_v4")
crcData := make([]byte, len(salt)+len(a.Key)+2) crcData := pool.Get(len(salt) + len(a.Key) + 2)
copy(crcData[:2], ret[:2]) defer pool.Put(crcData)
binary.BigEndian.PutUint16(crcData, uint16(packedAuthDataLength))
copy(crcData[2:], salt) copy(crcData[2:], salt)
copy(crcData[2+len(salt):], a.Key) copy(crcData[2+len(salt):], a.Key)
crc := crc32.ChecksumIEEE(crcData) & 0xFFFFFFFF
// 2~6, crc of (ret size+salt+key)
binary.LittleEndian.PutUint32(ret[2:], crc)
// 6~(rand size+6), rand numbers
rand.Read(ret[dataOffset-randSize : dataOffset])
// 6, rand size
if randSize < 128 {
ret[6] = byte(randSize & 0xFF)
} else {
// 6, magic number 0xFF
ret[6] = 0xFF
// 7~8, rand size
binary.BigEndian.PutUint16(ret[7:9], uint16(randSize&0xFFFF))
}
// rand size+6~(rand size+10), time stamp
now := time.Now().Unix()
binary.LittleEndian.PutUint32(ret[dataOffset:dataOffset+4], uint32(now))
// rand size+10~(rand size+14), client ID
copy(ret[dataOffset+4:dataOffset+4+4], a.clientID[:4])
// rand size+14~(rand size+18), connection ID
binary.LittleEndian.PutUint32(ret[dataOffset+8:dataOffset+8+4], a.connectionID)
// rand size+18~(rand size+18)+data length, data
copy(ret[dataOffset+12:], data)
key := make([]byte, len(a.IV)+len(a.Key)) key := pool.Get(len(a.iv) + len(a.Key))
copy(key, a.IV) defer pool.Put(key)
copy(key[len(a.IV):], a.Key) copy(key, a.iv)
copy(key[len(a.iv):], a.Key)
h := tools.HmacSHA1(key, ret[:retSize-tools.HmacSHA1Len]) poolBuf.Write(crcData[:2])
// (ret size-10)~(ret size)/(rand size)+18+data length~end, hmac binary.Write(poolBuf, binary.LittleEndian, crc32.ChecksumIEEE(crcData))
copy(ret[retSize-tools.HmacSHA1Len:], h[:tools.HmacSHA1Len]) a.packRandData(poolBuf, randDataLength)
return ret a.putAuthData(poolBuf)
poolBuf.Write(data)
poolBuf.Write(tools.HmacSHA1(key, poolBuf.Bytes()[poolBuf.Len()-packedAuthDataLength+10:])[:10])
} }
func getHeadSize(data []byte, defaultValue int) int { func (a *authSHA1V4) packRandData(poolBuf *bytes.Buffer, size int) {
if data == nil || len(data) < 2 { if size < 128 {
return defaultValue poolBuf.WriteByte(byte(size + 1))
tools.AppendRandBytes(poolBuf, size)
return
} }
headType := data[0] & 0x07 poolBuf.WriteByte(255)
switch headType { binary.Write(poolBuf, binary.BigEndian, uint16(size+3))
case 1: tools.AppendRandBytes(poolBuf, size)
// IPv4 1+4+2 }
return 7
case 4: func (a *authSHA1V4) getRandDataLength(size int) int {
// IPv6 1+16+2 if size > 1200 {
return 19 return 0
case 3: }
// domain name, variant length if size > 400 {
return 4 + int(data[1]) return rand.Intn(256)
} }
return rand.Intn(512)
return defaultValue
} }

73
component/ssr/protocol/base.go
View file

@ -1,10 +1,77 @@
package protocol package protocol
// Base information for protocol import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"encoding/binary"
"math/rand"
"sync"
"time"
"github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/log"
"github.com/Dreamacro/go-shadowsocks2/core"
)
type Base struct { type Base struct {
IV []byte
Key []byte Key []byte
TCPMss int
Overhead int Overhead int
Param string Param string
} }
type userData struct {
userKey []byte
userID [4]byte
}
type authData struct {
clientID [4]byte
connectionID uint32
mutex sync.Mutex
}
func (a *authData) next() *authData {
r := &authData{}
a.mutex.Lock()
defer a.mutex.Unlock()
if a.connectionID > 0xff000000 || a.connectionID == 0 {
rand.Read(a.clientID[:])
a.connectionID = rand.Uint32() & 0xffffff
}
a.connectionID++
copy(r.clientID[:], a.clientID[:])
r.connectionID = a.connectionID
return r
}
func (a *authData) putAuthData(buf *bytes.Buffer) {
binary.Write(buf, binary.LittleEndian, uint32(time.Now().Unix()))
buf.Write(a.clientID[:])
binary.Write(buf, binary.LittleEndian, a.connectionID)
}
func (a *authData) putEncryptedData(b *bytes.Buffer, userKey []byte, paddings [2]int, salt string) error {
encrypt := pool.Get(16)
defer pool.Put(encrypt)
binary.LittleEndian.PutUint32(encrypt, uint32(time.Now().Unix()))
copy(encrypt[4:], a.clientID[:])
binary.LittleEndian.PutUint32(encrypt[8:], a.connectionID)
binary.LittleEndian.PutUint16(encrypt[12:], uint16(paddings[0]))
binary.LittleEndian.PutUint16(encrypt[14:], uint16(paddings[1]))
cipherKey := core.Kdf(base64.StdEncoding.EncodeToString(userKey)+salt, 16)
block, err := aes.NewCipher(cipherKey)
if err != nil {
log.Warnln("New cipher error: %s", err.Error())
return err
}
iv := bytes.Repeat([]byte{0}, 16)
cbcCipher := cipher.NewCBCEncrypter(block, iv)
cbcCipher.CryptBlocks(encrypt, encrypt)
b.Write(encrypt)
return nil
}

51
component/ssr/protocol/origin.go
View file

@ -1,36 +1,33 @@
package protocol package protocol
type origin struct{ *Base } import (
"bytes"
"net"
)
func init() { type origin struct{}
register("origin", newOrigin)
func init() { register("origin", newOrigin, 0) }
func newOrigin(b *Base) Protocol { return &origin{} }
func (o *origin) StreamConn(c net.Conn, iv []byte) net.Conn { return c }
func (o *origin) PacketConn(c net.PacketConn) net.PacketConn { return c }
func (o *origin) Decode(dst, src *bytes.Buffer) error {
dst.ReadFrom(src)
return nil
} }
func newOrigin(b *Base) Protocol { func (o *origin) Encode(buf *bytes.Buffer, b []byte) error {
return &origin{} buf.Write(b)
return nil
} }
func (o *origin) initForConn(iv []byte) Protocol { return &origin{} } func (o *origin) DecodePacket(b []byte) ([]byte, error) { return b, nil }
func (o *origin) GetProtocolOverhead() int { func (o *origin) EncodePacket(buf *bytes.Buffer, b []byte) error {
return 0 buf.Write(b)
} return nil
func (o *origin) SetOverhead(overhead int) {
}
func (o *origin) Decode(b []byte) ([]byte, int, error) {
return b, len(b), nil
}
func (o *origin) Encode(b []byte) ([]byte, error) {
return b, nil
}
func (o *origin) DecodePacket(b []byte) ([]byte, int, error) {
return b, len(b), nil
}
func (o *origin) EncodePacket(b []byte) ([]byte, error) {
return b, nil
} }

24
component/ssr/protocol/packet.go
View file

@ -1,30 +1,26 @@
package protocol package protocol
import ( import (
"bytes"
"net" "net"
"github.com/Dreamacro/clash/common/pool" "github.com/Dreamacro/clash/component/ssr/tools"
) )
// NewPacketConn returns a net.NewPacketConn with protocol decoding/encoding
func NewPacketConn(pc net.PacketConn, p Protocol) net.PacketConn {
return &PacketConn{PacketConn: pc, Protocol: p.initForConn(nil)}
}
// PacketConn represents a protocol packet connection
type PacketConn struct { type PacketConn struct {
net.PacketConn net.PacketConn
Protocol Protocol
} }
func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) { func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
buf := pool.Get(pool.RelayBufferSize) buf := tools.BufPool.Get().(*bytes.Buffer)
defer pool.Put(buf) defer tools.BufPool.Put(buf)
buf, err := c.EncodePacket(b) defer buf.Reset()
err := c.EncodePacket(buf, b)
if err != nil { if err != nil {
return 0, err return 0, err
} }
_, err = c.PacketConn.WriteTo(buf, addr) _, err = c.PacketConn.WriteTo(buf.Bytes(), addr)
return len(b), err return len(b), err
} }
@ -33,10 +29,10 @@ func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
if err != nil { if err != nil {
return n, addr, err return n, addr, err
} }
bb, length, err := c.DecodePacket(b[:n]) decoded, err := c.DecodePacket(b[:n])
if err != nil { if err != nil {
return n, addr, err return n, addr, err
} }
copy(b, bb) copy(b, decoded)
return length, addr, err return len(decoded), addr, nil
} }

95
component/ssr/protocol/protocol.go
View file

@ -4,60 +4,73 @@ import (
"bytes" "bytes"
"errors" "errors"
"fmt" "fmt"
"strings" "math/rand"
"sync" "net"
) )
var ( var (
errAuthAES128IncorrectMAC = errors.New("auth_aes128_* post decrypt incorrect mac") errAuthSHA1V4CRC32Error = errors.New("auth_sha1_v4 decode data wrong crc32")
errAuthAES128DataLengthError = errors.New("auth_aes128_* post decrypt length mismatch") errAuthSHA1V4LengthError = errors.New("auth_sha1_v4 decode data wrong length")
errAuthAES128IncorrectChecksum = errors.New("auth_aes128_* post decrypt incorrect checksum") errAuthSHA1V4Adler32Error = errors.New("auth_sha1_v4 decode data wrong adler32")
errAuthAES128PositionTooLarge = errors.New("auth_aes128_* post decrypt position is too large") errAuthAES128MACError = errors.New("auth_aes128 decode data wrong mac")
errAuthSHA1v4CRC32Error = errors.New("auth_sha1_v4 post decrypt data crc32 error") errAuthAES128LengthError = errors.New("auth_aes128 decode data wrong length")
errAuthSHA1v4DataLengthError = errors.New("auth_sha1_v4 post decrypt data length error") errAuthAES128ChksumError = errors.New("auth_aes128 decode data wrong checksum")
errAuthSHA1v4IncorrectChecksum = errors.New("auth_sha1_v4 post decrypt incorrect checksum") errAuthChainLengthError = errors.New("auth_chain decode data wrong length")
errAuthChainDataLengthError = errors.New("auth_chain_* post decrypt length mismatch") errAuthChainChksumError = errors.New("auth_chain decode data wrong checksum")
errAuthChainHMACError = errors.New("auth_chain_* post decrypt hmac error")
) )
type authData struct {
clientID []byte
connectionID uint32
mutex sync.Mutex
}
type recvInfo struct {
recvID uint32
buffer *bytes.Buffer
}
type hmacMethod func(key []byte, data []byte) []byte
type hashDigestMethod func(data []byte) []byte
type rndMethod func(dataSize int, random *shift128PlusContext, lastHash []byte, dataSizeList, dataSizeList2 []int, overhead int) int
// Protocol provides methods for decoding, encoding and iv setting
type Protocol interface { type Protocol interface {
initForConn(iv []byte) Protocol StreamConn(net.Conn, []byte) net.Conn
GetProtocolOverhead() int PacketConn(net.PacketConn) net.PacketConn
SetOverhead(int) Decode(dst, src *bytes.Buffer) error
Decode([]byte) ([]byte, int, error) Encode(buf *bytes.Buffer, b []byte) error
Encode([]byte) ([]byte, error) DecodePacket([]byte) ([]byte, error)
DecodePacket([]byte) ([]byte, int, error) EncodePacket(buf *bytes.Buffer, b []byte) error
EncodePacket([]byte) ([]byte, error)
} }
type protocolCreator func(b *Base) Protocol type protocolCreator func(b *Base) Protocol
var protocolList = make(map[string]protocolCreator) var protocolList = make(map[string]struct {
overhead int
new protocolCreator
})
func register(name string, c protocolCreator) { func register(name string, c protocolCreator, o int) {
protocolList[name] = c protocolList[name] = struct {
overhead int
new protocolCreator
}{overhead: o, new: c}
} }
// PickProtocol returns a protocol of the given name
func PickProtocol(name string, b *Base) (Protocol, error) { func PickProtocol(name string, b *Base) (Protocol, error) {
if protocolCreator, ok := protocolList[strings.ToLower(name)]; ok { if choice, ok := protocolList[name]; ok {
return protocolCreator(b), nil b.Overhead += choice.overhead
return choice.new(b), nil
} }
return nil, fmt.Errorf("Protocol %s not supported", name) return nil, fmt.Errorf("protocol %s not supported", name)
}
func getHeadSize(b []byte, defaultValue int) int {
if len(b) < 2 {
return defaultValue
}
headType := b[0] & 7
switch headType {
case 1:
return 7
case 4:
return 19
case 3:
return 4 + int(b[1])
}
return defaultValue
}
func getDataLength(b []byte) int {
bLength := len(b)
dataLength := getHeadSize(b, 30) + rand.Intn(32)
if bLength < dataLength {
return bLength
}
return dataLength
} }

46
component/ssr/protocol/stream.go
View file

@ -5,31 +5,21 @@ import (
"net" "net"
"github.com/Dreamacro/clash/common/pool" "github.com/Dreamacro/clash/common/pool"
"github.com/Dreamacro/clash/component/ssr/tools"
) )
// NewConn wraps a stream-oriented net.Conn with protocol decoding/encoding
func NewConn(c net.Conn, p Protocol, iv []byte) net.Conn {
return &Conn{Conn: c, Protocol: p.initForConn(iv)}
}
// Conn represents a protocol connection
type Conn struct { type Conn struct {
net.Conn net.Conn
Protocol Protocol
buf []byte decoded bytes.Buffer
offset int
underDecoded bytes.Buffer underDecoded bytes.Buffer
} }
func (c *Conn) Read(b []byte) (int, error) { func (c *Conn) Read(b []byte) (int, error) {
if c.buf != nil { if c.decoded.Len() > 0 {
n := copy(b, c.buf[c.offset:]) return c.decoded.Read(b)
c.offset += n
if c.offset == len(c.buf) {
c.buf = nil
}
return n, nil
} }
buf := pool.Get(pool.RelayBufferSize) buf := pool.Get(pool.RelayBufferSize)
defer pool.Put(buf) defer pool.Put(buf)
n, err := c.Conn.Read(buf) n, err := c.Conn.Read(buf)
@ -37,32 +27,26 @@ func (c *Conn) Read(b []byte) (int, error) {
return 0, err return 0, err
} }
c.underDecoded.Write(buf[:n]) c.underDecoded.Write(buf[:n])
underDecoded := c.underDecoded.Bytes() err = c.Decode(&c.decoded, &c.underDecoded)
decoded, length, err := c.Decode(underDecoded)
if err != nil { if err != nil {
c.underDecoded.Reset() return 0, err
return 0, nil
}
if length == 0 {
return 0, nil
}
c.underDecoded.Next(length)
n = copy(b, decoded)
if len(decoded) > len(b) {
c.buf = decoded
c.offset = n
} }
n, _ = c.decoded.Read(b)
return n, nil return n, nil
} }
func (c *Conn) Write(b []byte) (int, error) { func (c *Conn) Write(b []byte) (int, error) {
encoded, err := c.Encode(b) bLength := len(b)
buf := tools.BufPool.Get().(*bytes.Buffer)
defer tools.BufPool.Put(buf)
defer buf.Reset()
err := c.Encode(buf, b)
if err != nil { if err != nil {
return 0, err return 0, err
} }
_, err = c.Conn.Write(encoded) _, err = c.Conn.Write(buf.Bytes())
if err != nil { if err != nil {
return 0, err return 0, err
} }
return len(b), nil return bLength, nil
} }

18
component/ssr/tools/bufPool.go Normal file
View file

@ -0,0 +1,18 @@
package tools
import (
"bytes"
"math/rand"
"sync"
"github.com/Dreamacro/clash/common/pool"
)
var BufPool = sync.Pool{New: func() interface{} { return &bytes.Buffer{} }}
func AppendRandBytes(b *bytes.Buffer, length int) {
randBytes := pool.Get(length)
defer pool.Put(randBytes)
rand.Read(randBytes)
b.Write(randBytes)
}

4
component/ssr/tools/encrypt.go → component/ssr/tools/crypto.go
View file

@ -11,13 +11,13 @@ const HmacSHA1Len = 10
func HmacMD5(key, data []byte) []byte { func HmacMD5(key, data []byte) []byte {
hmacMD5 := hmac.New(md5.New, key) hmacMD5 := hmac.New(md5.New, key)
hmacMD5.Write(data) hmacMD5.Write(data)
return hmacMD5.Sum(nil)[:16] return hmacMD5.Sum(nil)
} }
func HmacSHA1(key, data []byte) []byte { func HmacSHA1(key, data []byte) []byte {
hmacSHA1 := hmac.New(sha1.New, key) hmacSHA1 := hmac.New(sha1.New, key)
hmacSHA1.Write(data) hmacSHA1.Write(data)
return hmacSHA1.Sum(nil)[:20] return hmacSHA1.Sum(nil)
} }
func MD5Sum(b []byte) []byte { func MD5Sum(b []byte) []byte {

57
component/ssr/tools/random.go Normal file
View file

@ -0,0 +1,57 @@
package tools
import (
"encoding/binary"
"github.com/Dreamacro/clash/common/pool"
)
// XorShift128Plus - a pseudorandom number generator
type XorShift128Plus struct {
s [2]uint64
}
func (r *XorShift128Plus) Next() uint64 {
x := r.s[0]
y := r.s[1]
r.s[0] = y
x ^= x << 23
x ^= y ^ (x >> 17) ^ (y >> 26)
r.s[1] = x
return x + y
}
func (r *XorShift128Plus) InitFromBin(bin []byte) {
var full []byte
if len(bin) < 16 {
full := pool.Get(16)[:0]
defer pool.Put(full)
full = append(full, bin...)
for len(full) < 16 {
full = append(full, 0)
}
} else {
full = bin
}
r.s[0] = binary.LittleEndian.Uint64(full[:8])
r.s[1] = binary.LittleEndian.Uint64(full[8:16])
}
func (r *XorShift128Plus) InitFromBinAndLength(bin []byte, length int) {
var full []byte
if len(bin) < 16 {
full := pool.Get(16)[:0]
defer pool.Put(full)
full = append(full, bin...)
for len(full) < 16 {
full = append(full, 0)
}
}
full = bin
binary.LittleEndian.PutUint16(full, uint16(length))
r.s[0] = binary.LittleEndian.Uint64(full[:8])
r.s[1] = binary.LittleEndian.Uint64(full[8:16])
for i := 0; i < 4; i++ {
r.Next()
}
}