frp/pkg/util/vhost/http.go

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// Copyright 2017 fatedier, fatedier@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package vhost
import (
"bytes"
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"context"
"encoding/base64"
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"errors"
"fmt"
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"log"
"net"
"net/http"
"strings"
"time"
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frpLog "github.com/fatedier/frp/pkg/util/log"
"github.com/fatedier/frp/pkg/util/util"
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"github.com/fatedier/golib/pool"
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)
var (
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ErrNoDomain = errors.New("no such domain")
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)
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type HTTPReverseProxyOptions struct {
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ResponseHeaderTimeoutS int64
}
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type HTTPReverseProxy struct {
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proxy *ReverseProxy
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vhostRouter *Routers
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responseHeaderTimeout time.Duration
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}
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func NewHTTPReverseProxy(option HTTPReverseProxyOptions, vhostRouter *Routers) *HTTPReverseProxy {
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if option.ResponseHeaderTimeoutS <= 0 {
option.ResponseHeaderTimeoutS = 60
}
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rp := &HTTPReverseProxy{
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responseHeaderTimeout: time.Duration(option.ResponseHeaderTimeoutS) * time.Second,
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vhostRouter: vhostRouter,
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}
proxy := &ReverseProxy{
Director: func(req *http.Request) {
req.URL.Scheme = "http"
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url := req.Context().Value(RouteInfoURL).(string)
oldHost := util.GetHostFromAddr(req.Context().Value(RouteInfoHost).(string))
rc := rp.GetRouteConfig(oldHost, url)
if rc != nil {
if rc.RewriteHost != "" {
req.Host = rc.RewriteHost
}
// Set {domain}.{location} as URL host here to let http transport reuse connections.
req.URL.Host = rc.Domain + "." + base64.StdEncoding.EncodeToString([]byte(rc.Location))
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for k, v := range rc.Headers {
req.Header.Set(k, v)
}
} else {
req.URL.Host = req.Host
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}
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},
Transport: &http.Transport{
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ResponseHeaderTimeout: rp.responseHeaderTimeout,
IdleConnTimeout: 60 * time.Second,
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DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
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url := ctx.Value(RouteInfoURL).(string)
host := util.GetHostFromAddr(ctx.Value(RouteInfoHost).(string))
remote := ctx.Value(RouteInfoRemote).(string)
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return rp.CreateConnection(host, url, remote)
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},
},
BufferPool: newWrapPool(),
ErrorLog: log.New(newWrapLogger(), "", 0),
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ErrorHandler: func(rw http.ResponseWriter, req *http.Request, err error) {
frpLog.Warn("do http proxy request error: %v", err)
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rw.WriteHeader(http.StatusNotFound)
rw.Write(getNotFoundPageContent())
},
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}
rp.proxy = proxy
return rp
}
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// Register register the route config to reverse proxy
// reverse proxy will use CreateConnFn from routeCfg to create a connection to the remote service
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func (rp *HTTPReverseProxy) Register(routeCfg RouteConfig) error {
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err := rp.vhostRouter.Add(routeCfg.Domain, routeCfg.Location, &routeCfg)
if err != nil {
return err
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}
return nil
}
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// UnRegister unregister route config by domain and location
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func (rp *HTTPReverseProxy) UnRegister(domain string, location string) {
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rp.vhostRouter.Del(domain, location)
}
func (rp *HTTPReverseProxy) GetRouteConfig(domain string, location string) *RouteConfig {
vr, ok := rp.getVhost(domain, location)
if ok {
return vr.payload.(*RouteConfig)
}
return nil
}
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func (rp *HTTPReverseProxy) GetRealHost(domain string, location string) (host string) {
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vr, ok := rp.getVhost(domain, location)
if ok {
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host = vr.payload.(*RouteConfig).RewriteHost
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}
return
}
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func (rp *HTTPReverseProxy) GetHeaders(domain string, location string) (headers map[string]string) {
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vr, ok := rp.getVhost(domain, location)
if ok {
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headers = vr.payload.(*RouteConfig).Headers
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}
return
}
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// CreateConnection create a new connection by route config
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func (rp *HTTPReverseProxy) CreateConnection(domain string, location string, remoteAddr string) (net.Conn, error) {
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vr, ok := rp.getVhost(domain, location)
if ok {
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fn := vr.payload.(*RouteConfig).CreateConnFn
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if fn != nil {
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return fn(remoteAddr)
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}
}
return nil, fmt.Errorf("%v: %s %s", ErrNoDomain, domain, location)
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}
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func (rp *HTTPReverseProxy) CheckAuth(domain, location, user, passwd string) bool {
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vr, ok := rp.getVhost(domain, location)
if ok {
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checkUser := vr.payload.(*RouteConfig).Username
checkPasswd := vr.payload.(*RouteConfig).Password
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if (checkUser != "" || checkPasswd != "") && (checkUser != user || checkPasswd != passwd) {
return false
}
}
return true
}
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// getVhost get vhost router by domain and location
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func (rp *HTTPReverseProxy) getVhost(domain string, location string) (vr *Router, ok bool) {
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// first we check the full hostname
// if not exist, then check the wildcard_domain such as *.example.com
vr, ok = rp.vhostRouter.Get(domain, location)
if ok {
return
}
domainSplit := strings.Split(domain, ".")
if len(domainSplit) < 3 {
return nil, false
}
for {
if len(domainSplit) < 3 {
return nil, false
}
domainSplit[0] = "*"
domain = strings.Join(domainSplit, ".")
vr, ok = rp.vhostRouter.Get(domain, location)
if ok {
return vr, true
}
domainSplit = domainSplit[1:]
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}
}
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func (rp *HTTPReverseProxy) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
domain := util.GetHostFromAddr(req.Host)
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location := req.URL.Path
user, passwd, _ := req.BasicAuth()
if !rp.CheckAuth(domain, location, user, passwd) {
rw.Header().Set("WWW-Authenticate", `Basic realm="Restricted"`)
http.Error(rw, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
return
}
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rp.proxy.ServeHTTP(rw, req)
}
type wrapPool struct{}
func newWrapPool() *wrapPool { return &wrapPool{} }
func (p *wrapPool) Get() []byte { return pool.GetBuf(32 * 1024) }
func (p *wrapPool) Put(buf []byte) { pool.PutBuf(buf) }
type wrapLogger struct{}
func newWrapLogger() *wrapLogger { return &wrapLogger{} }
func (l *wrapLogger) Write(p []byte) (n int, err error) {
frpLog.Warn("%s", string(bytes.TrimRight(p, "\n")))
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return len(p), nil
}