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* Refactor ssr stream cipher to expose iv and key References: https://github.com/Dreamacro/go-shadowsocks2 https://github.com/sh4d0wfiend/go-shadowsocksr2 * Implement ssr obfs Reference: https://github.com/mzz2017/shadowsocksR * Implement ssr protocol References: https://github.com/mzz2017/shadowsocksR https://github.com/shadowsocksRb/shadowsocksr-libev https://github.com/shadowsocksr-backup/shadowsocksr
134 lines
3.5 KiB
Go
134 lines
3.5 KiB
Go
package outbound
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import (
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"context"
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"encoding/json"
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"fmt"
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"net"
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"strconv"
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"github.com/Dreamacro/clash/component/dialer"
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"github.com/Dreamacro/clash/component/ssr/obfs"
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"github.com/Dreamacro/clash/component/ssr/protocol"
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C "github.com/Dreamacro/clash/constant"
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"github.com/Dreamacro/go-shadowsocks2/core"
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"github.com/Dreamacro/go-shadowsocks2/shadowstream"
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)
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type ShadowSocksR struct {
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*Base
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cipher *core.StreamCipher
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obfs obfs.Obfs
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protocol protocol.Protocol
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}
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type ShadowSocksROption struct {
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Name string `proxy:"name"`
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Server string `proxy:"server"`
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Port int `proxy:"port"`
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Password string `proxy:"password"`
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Cipher string `proxy:"cipher"`
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Obfs string `proxy:"obfs"`
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ObfsParam string `proxy:"obfs-param,omitempty"`
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Protocol string `proxy:"protocol"`
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ProtocolParam string `proxy:"protocol-param,omitempty"`
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UDP bool `proxy:"udp,omitempty"`
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}
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func (ssr *ShadowSocksR) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
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c = obfs.NewConn(c, ssr.obfs)
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c = ssr.cipher.StreamConn(c)
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conn, ok := c.(*shadowstream.Conn)
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if !ok {
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return nil, fmt.Errorf("invalid connection type")
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}
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iv, err := conn.ObtainWriteIV()
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if err != nil {
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return nil, err
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}
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c = protocol.NewConn(c, ssr.protocol, iv)
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_, err = c.Write(serializesSocksAddr(metadata))
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return c, err
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}
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func (ssr *ShadowSocksR) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
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c, err := dialer.DialContext(ctx, "tcp", ssr.addr)
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if err != nil {
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return nil, fmt.Errorf("%s connect error: %w", ssr.addr, err)
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}
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tcpKeepAlive(c)
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c, err = ssr.StreamConn(c, metadata)
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return NewConn(c, ssr), err
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}
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func (ssr *ShadowSocksR) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
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pc, err := dialer.ListenPacket("udp", "")
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if err != nil {
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return nil, err
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}
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addr, err := resolveUDPAddr("udp", ssr.addr)
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if err != nil {
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return nil, err
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}
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pc = ssr.cipher.PacketConn(pc)
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pc = protocol.NewPacketConn(pc, ssr.protocol)
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return newPacketConn(&ssPacketConn{PacketConn: pc, rAddr: addr}, ssr), nil
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}
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func (ssr *ShadowSocksR) MarshalJSON() ([]byte, error) {
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return json.Marshal(map[string]string{
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"type": ssr.Type().String(),
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})
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}
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func NewShadowSocksR(option ShadowSocksROption) (*ShadowSocksR, error) {
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addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
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cipher := option.Cipher
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password := option.Password
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coreCiph, err := core.PickCipher(cipher, nil, password)
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if err != nil {
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return nil, fmt.Errorf("ssr %s initialize cipher error: %w", addr, err)
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}
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ciph, ok := coreCiph.(*core.StreamCipher)
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if !ok {
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return nil, fmt.Errorf("%s is not a supported stream cipher in ssr", cipher)
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}
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obfs, err := obfs.PickObfs(option.Obfs, &obfs.Base{
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IVSize: ciph.IVSize(),
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Key: ciph.Key,
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HeadLen: 30,
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Host: option.Server,
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Port: option.Port,
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Param: option.ObfsParam,
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})
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if err != nil {
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return nil, fmt.Errorf("ssr %s initialize obfs error: %w", addr, err)
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}
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protocol, err := protocol.PickProtocol(option.Protocol, &protocol.Base{
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IV: nil,
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Key: ciph.Key,
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TCPMss: 1460,
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Param: option.ProtocolParam,
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})
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if err != nil {
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return nil, fmt.Errorf("ssr %s initialize protocol error: %w", addr, err)
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}
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protocol.SetOverhead(obfs.GetObfsOverhead() + protocol.GetProtocolOverhead())
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return &ShadowSocksR{
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Base: &Base{
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name: option.Name,
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addr: addr,
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tp: C.ShadowsocksR,
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udp: option.UDP,
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},
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cipher: ciph,
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obfs: obfs,
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protocol: protocol,
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}, nil
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}
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