2017-05-30 08:37:51 +02:00
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// Copyright 2017 frp team
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package plugin
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import (
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2017-06-08 20:13:24 +02:00
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"bufio"
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2017-05-30 08:37:51 +02:00
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"encoding/base64"
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"io"
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"net"
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"net/http"
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"strings"
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frpNet "github.com/fatedier/frp/utils/net"
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2018-05-08 17:42:04 +02:00
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frpIo "github.com/fatedier/golib/io"
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2018-05-08 18:23:42 +02:00
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gnet "github.com/fatedier/golib/net"
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2017-05-30 08:37:51 +02:00
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)
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2020-05-24 11:48:37 +02:00
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const PluginHTTPProxy = "http_proxy"
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func init() {
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Register(PluginHTTPProxy, NewHTTPProxyPlugin)
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}
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type HTTPProxy struct {
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l *Listener
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s *http.Server
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AuthUser string
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AuthPasswd string
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}
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func NewHTTPProxyPlugin(params map[string]string) (Plugin, error) {
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user := params["plugin_http_user"]
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passwd := params["plugin_http_passwd"]
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listener := NewProxyListener()
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2020-05-24 11:48:37 +02:00
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hp := &HTTPProxy{
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l: listener,
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AuthUser: user,
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AuthPasswd: passwd,
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}
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hp.s = &http.Server{
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Handler: hp,
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}
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go hp.s.Serve(listener)
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return hp, nil
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}
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func (hp *HTTPProxy) Name() string {
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return PluginHTTPProxy
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}
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2020-05-24 11:48:37 +02:00
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func (hp *HTTPProxy) Handle(conn io.ReadWriteCloser, realConn net.Conn, extraBufToLocal []byte) {
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2018-01-17 17:45:11 +01:00
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wrapConn := frpNet.WrapReadWriteCloserToConn(conn, realConn)
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2018-05-08 18:23:42 +02:00
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sc, rd := gnet.NewSharedConn(wrapConn)
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2018-05-06 16:47:26 +02:00
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firstBytes := make([]byte, 7)
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_, err := rd.Read(firstBytes)
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if err != nil {
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wrapConn.Close()
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return
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}
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2018-05-06 16:47:26 +02:00
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if strings.ToUpper(string(firstBytes)) == "CONNECT" {
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bufRd := bufio.NewReader(sc)
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request, err := http.ReadRequest(bufRd)
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if err != nil {
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wrapConn.Close()
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return
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}
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hp.handleConnectReq(request, frpIo.WrapReadWriteCloser(bufRd, wrapConn, wrapConn.Close))
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return
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}
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hp.l.PutConn(sc)
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return
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}
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func (hp *HTTPProxy) Close() error {
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hp.s.Close()
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hp.l.Close()
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return nil
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}
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func (hp *HTTPProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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if ok := hp.Auth(req); !ok {
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rw.Header().Set("Proxy-Authenticate", "Basic")
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rw.WriteHeader(http.StatusProxyAuthRequired)
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return
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}
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2017-06-08 20:13:24 +02:00
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if req.Method == http.MethodConnect {
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// deprecated
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// Connect request is handled in Handle function.
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hp.ConnectHandler(rw, req)
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} else {
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hp.HTTPHandler(rw, req)
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}
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}
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2020-05-24 11:48:37 +02:00
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func (hp *HTTPProxy) HTTPHandler(rw http.ResponseWriter, req *http.Request) {
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removeProxyHeaders(req)
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resp, err := http.DefaultTransport.RoundTrip(req)
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if err != nil {
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http.Error(rw, err.Error(), http.StatusInternalServerError)
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return
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}
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defer resp.Body.Close()
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copyHeaders(rw.Header(), resp.Header)
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rw.WriteHeader(resp.StatusCode)
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_, err = io.Copy(rw, resp.Body)
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if err != nil && err != io.EOF {
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return
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}
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}
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2017-06-08 20:13:24 +02:00
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// deprecated
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// Hijack needs to SetReadDeadline on the Conn of the request, but if we use stream compression here,
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// we may always get i/o timeout error.
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func (hp *HTTPProxy) ConnectHandler(rw http.ResponseWriter, req *http.Request) {
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2017-05-30 08:37:51 +02:00
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hj, ok := rw.(http.Hijacker)
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if !ok {
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rw.WriteHeader(http.StatusInternalServerError)
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return
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}
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client, _, err := hj.Hijack()
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if err != nil {
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rw.WriteHeader(http.StatusInternalServerError)
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return
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}
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remote, err := net.Dial("tcp", req.URL.Host)
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if err != nil {
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http.Error(rw, "Failed", http.StatusBadRequest)
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client.Close()
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return
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}
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2017-06-08 19:33:57 +02:00
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client.Write([]byte("HTTP/1.1 200 OK\r\n\r\n"))
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2017-06-06 12:48:40 +02:00
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go frpIo.Join(remote, client)
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2017-05-30 08:37:51 +02:00
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}
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2020-05-24 11:48:37 +02:00
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func (hp *HTTPProxy) Auth(req *http.Request) bool {
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if hp.AuthUser == "" && hp.AuthPasswd == "" {
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return true
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}
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s := strings.SplitN(req.Header.Get("Proxy-Authorization"), " ", 2)
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if len(s) != 2 {
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return false
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}
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b, err := base64.StdEncoding.DecodeString(s[1])
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if err != nil {
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return false
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}
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pair := strings.SplitN(string(b), ":", 2)
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if len(pair) != 2 {
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return false
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}
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if pair[0] != hp.AuthUser || pair[1] != hp.AuthPasswd {
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return false
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}
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return true
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}
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2020-05-24 11:48:37 +02:00
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func (hp *HTTPProxy) handleConnectReq(req *http.Request, rwc io.ReadWriteCloser) {
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2017-06-08 20:13:24 +02:00
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defer rwc.Close()
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if ok := hp.Auth(req); !ok {
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res := getBadResponse()
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res.Write(rwc)
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return
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}
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remote, err := net.Dial("tcp", req.URL.Host)
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if err != nil {
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res := &http.Response{
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StatusCode: 400,
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Proto: "HTTP/1.1",
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ProtoMajor: 1,
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ProtoMinor: 1,
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}
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res.Write(rwc)
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return
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}
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rwc.Write([]byte("HTTP/1.1 200 OK\r\n\r\n"))
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frpIo.Join(remote, rwc)
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}
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2017-05-30 08:37:51 +02:00
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func copyHeaders(dst, src http.Header) {
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for key, values := range src {
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for _, value := range values {
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dst.Add(key, value)
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}
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}
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}
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func removeProxyHeaders(req *http.Request) {
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req.RequestURI = ""
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req.Header.Del("Proxy-Connection")
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req.Header.Del("Connection")
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req.Header.Del("Proxy-Authenticate")
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req.Header.Del("Proxy-Authorization")
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req.Header.Del("TE")
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req.Header.Del("Trailers")
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req.Header.Del("Transfer-Encoding")
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req.Header.Del("Upgrade")
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}
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2017-06-08 20:13:24 +02:00
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func getBadResponse() *http.Response {
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header := make(map[string][]string)
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header["Proxy-Authenticate"] = []string{"Basic"}
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2020-07-01 05:18:23 +02:00
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header["Connection"] = []string{"close"}
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2017-06-08 20:13:24 +02:00
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res := &http.Response{
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Status: "407 Not authorized",
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StatusCode: 407,
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Proto: "HTTP/1.1",
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ProtoMajor: 1,
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ProtoMinor: 1,
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Header: header,
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}
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return res
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}
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