You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
137 lines
3.0 KiB
Go
137 lines
3.0 KiB
Go
package proxy
|
|
|
|
import (
|
|
"bufio"
|
|
"crypto/tls"
|
|
"net"
|
|
"net/http"
|
|
"strings"
|
|
|
|
"github.com/lqqyt2423/go-mitmproxy/cert"
|
|
)
|
|
|
|
// 模拟了标准库中 server 运行，目的是仅通过当前进程内存转发 socket 数据，不需要经过 tcp 或 unix socket
|
|
|
|
// mock net.Listener
|
|
type listener struct {
|
|
connChan chan net.Conn
|
|
}
|
|
|
|
func (l *listener) Accept() (net.Conn, error) { return <-l.connChan, nil }
|
|
func (l *listener) Close() error { return nil }
|
|
func (l *listener) Addr() net.Addr { return nil }
|
|
|
|
// 建立客户端和服务端通信的通道
|
|
func newPipes(host string) (net.Conn, *connBuf) {
|
|
client, srv := net.Pipe()
|
|
server := newConnBuf(srv, host)
|
|
return client, server
|
|
}
|
|
|
|
// add Peek method for conn
|
|
type connBuf struct {
|
|
net.Conn
|
|
r *bufio.Reader
|
|
host string
|
|
}
|
|
|
|
func newConnBuf(c net.Conn, host string) *connBuf {
|
|
return &connBuf{
|
|
Conn: c,
|
|
r: bufio.NewReader(c),
|
|
host: host,
|
|
}
|
|
}
|
|
|
|
func (b *connBuf) Peek(n int) ([]byte, error) {
|
|
return b.r.Peek(n)
|
|
}
|
|
|
|
func (b *connBuf) Read(data []byte) (int, error) {
|
|
return b.r.Read(data)
|
|
}
|
|
|
|
// Middle: man-in-the-middle
|
|
type Middle struct {
|
|
Proxy *Proxy
|
|
CA *cert.CA
|
|
Listener net.Listener
|
|
Server *http.Server
|
|
}
|
|
|
|
func NewMiddle(proxy *Proxy) (Interceptor, error) {
|
|
ca, err := cert.NewCA("")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
m := &Middle{
|
|
Proxy: proxy,
|
|
CA: ca,
|
|
}
|
|
|
|
server := &http.Server{
|
|
Handler: m,
|
|
TLSNextProto: make(map[string]func(*http.Server, *tls.Conn, http.Handler)), // disable http2
|
|
TLSConfig: &tls.Config{
|
|
GetCertificate: func(chi *tls.ClientHelloInfo) (*tls.Certificate, error) {
|
|
log.Debugf("Middle GetCertificate ServerName: %v\n", chi.ServerName)
|
|
return ca.GetCert(chi.ServerName)
|
|
},
|
|
},
|
|
}
|
|
|
|
m.Server = server
|
|
m.Listener = &listener{make(chan net.Conn)}
|
|
|
|
return m, nil
|
|
}
|
|
|
|
func (m *Middle) Start() error {
|
|
return m.Server.ServeTLS(m.Listener, "", "")
|
|
}
|
|
|
|
func (m *Middle) Dial(host string) (net.Conn, error) {
|
|
clientConn, serverConn := newPipes(host)
|
|
go m.intercept(serverConn)
|
|
return clientConn, nil
|
|
}
|
|
|
|
func (m *Middle) ServeHTTP(res http.ResponseWriter, req *http.Request) {
|
|
if strings.EqualFold(req.Header.Get("Connection"), "Upgrade") && strings.EqualFold(req.Header.Get("Upgrade"), "websocket") {
|
|
// wss
|
|
DefaultWebSocket.WSS(res, req)
|
|
return
|
|
}
|
|
|
|
if req.URL.Scheme == "" {
|
|
req.URL.Scheme = "https"
|
|
}
|
|
if req.URL.Host == "" {
|
|
req.URL.Host = req.Host
|
|
}
|
|
m.Proxy.ServeHTTP(res, req)
|
|
}
|
|
|
|
// 解析 connect 流量
|
|
// 如果是 tls 流量，则进入 listener.Accept => Middle.ServeHTTP
|
|
// 否则很可能是 ws 流量
|
|
func (m *Middle) intercept(serverConn *connBuf) {
|
|
log := log.WithField("in", "Middle.intercept").WithField("host", serverConn.host)
|
|
|
|
buf, err := serverConn.Peek(3)
|
|
if err != nil {
|
|
log.Errorf("Peek error: %v\n", err)
|
|
serverConn.Close()
|
|
return
|
|
}
|
|
|
|
if buf[0] == 0x16 && buf[1] == 0x03 && (buf[2] >= 0x0 || buf[2] <= 0x03) {
|
|
// tls
|
|
m.Listener.(*listener).connChan <- serverConn
|
|
} else {
|
|
// ws
|
|
DefaultWebSocket.WS(serverConn, serverConn.host)
|
|
}
|
|
}
|