mirror of
https://github.com/fatedier/frp.git
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125 lines
3.3 KiB
Go
125 lines
3.3 KiB
Go
// Copyright 2020 guylewin, guy@lewin.co.il
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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 tcpmux
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import (
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"bufio"
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"fmt"
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"io"
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"net"
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"net/http"
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"time"
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libnet "github.com/fatedier/golib/net"
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httppkg "github.com/fatedier/frp/pkg/util/http"
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"github.com/fatedier/frp/pkg/util/vhost"
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)
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type HTTPConnectTCPMuxer struct {
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*vhost.Muxer
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// If passthrough is set to true, the CONNECT request will be forwarded to the backend service.
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// Otherwise, it will return an OK response to the client and forward the remaining content to the backend service.
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passthrough bool
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}
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func NewHTTPConnectTCPMuxer(listener net.Listener, passthrough bool, timeout time.Duration) (*HTTPConnectTCPMuxer, error) {
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ret := &HTTPConnectTCPMuxer{passthrough: passthrough}
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mux, err := vhost.NewMuxer(listener, ret.getHostFromHTTPConnect, timeout)
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mux.SetCheckAuthFunc(ret.auth).
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SetSuccessHookFunc(ret.sendConnectResponse).
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SetFailHookFunc(vhostFailed)
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ret.Muxer = mux
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return ret, err
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}
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func (muxer *HTTPConnectTCPMuxer) readHTTPConnectRequest(rd io.Reader) (host, httpUser, httpPwd string, err error) {
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bufioReader := bufio.NewReader(rd)
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req, err := http.ReadRequest(bufioReader)
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if err != nil {
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return
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}
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if req.Method != "CONNECT" {
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err = fmt.Errorf("connections to tcp vhost must be of method CONNECT")
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return
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}
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host, _ = httppkg.CanonicalHost(req.Host)
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proxyAuth := req.Header.Get("Proxy-Authorization")
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if proxyAuth != "" {
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httpUser, httpPwd, _ = httppkg.ParseBasicAuth(proxyAuth)
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}
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return
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}
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func (muxer *HTTPConnectTCPMuxer) sendConnectResponse(c net.Conn, _ map[string]string) error {
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if muxer.passthrough {
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return nil
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}
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res := httppkg.OkResponse()
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if res.Body != nil {
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defer res.Body.Close()
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}
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return res.Write(c)
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}
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func (muxer *HTTPConnectTCPMuxer) auth(c net.Conn, username, password string, reqInfo map[string]string) (bool, error) {
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reqUsername := reqInfo["HTTPUser"]
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reqPassword := reqInfo["HTTPPwd"]
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if username == reqUsername && password == reqPassword {
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return true, nil
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}
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resp := httppkg.ProxyUnauthorizedResponse()
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if resp.Body != nil {
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defer resp.Body.Close()
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}
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_ = resp.Write(c)
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return false, nil
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}
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func vhostFailed(c net.Conn) {
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res := vhost.NotFoundResponse()
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if res.Body != nil {
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defer res.Body.Close()
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}
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_ = res.Write(c)
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_ = c.Close()
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}
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func (muxer *HTTPConnectTCPMuxer) getHostFromHTTPConnect(c net.Conn) (net.Conn, map[string]string, error) {
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reqInfoMap := make(map[string]string, 0)
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sc, rd := libnet.NewSharedConn(c)
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host, httpUser, httpPwd, err := muxer.readHTTPConnectRequest(rd)
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if err != nil {
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return nil, reqInfoMap, err
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}
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reqInfoMap["Host"] = host
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reqInfoMap["Scheme"] = "tcp"
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reqInfoMap["HTTPUser"] = httpUser
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reqInfoMap["HTTPPwd"] = httpPwd
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outConn := c
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if muxer.passthrough {
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outConn = sc
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}
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return outConn, reqInfoMap, nil
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}
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