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package httpreverse
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import (
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"b612.me/starlog"
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"bytes"
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"context"
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"crypto/tls"
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"encoding/base64"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"net/http/httputil"
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"net/url"
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"strconv"
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"strings"
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"time"
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)
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var version = "2.1.0"
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func (h *ReverseConfig) Run() error {
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err := h.init()
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if err != nil {
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return err
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}
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for key, proxy := range h.proxy {
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h.httpmux.HandleFunc(key, func(writer http.ResponseWriter, request *http.Request) {
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starlog.Infof("<%s> Req Path:%s ListenAddr:%s UA:%s\n", h.Name, request.URL.Path, request.RemoteAddr, request.Header.Get("User-Agent"))
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if !h.BasicAuth(writer, request) {
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h.SetResponseHeader(writer)
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return
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}
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if !h.filter(writer, request) {
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h.SetResponseHeader(writer)
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writer.WriteHeader(403)
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if len(h.warnpagedata) != 0 {
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writer.Write(h.warnpagedata)
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return
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}
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writer.Write([]byte(`
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<html>
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<head><title>403 Forbidden</title></head>
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<body>
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<center><h1>403 Forbidden</h1></center>
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<center><h3>You Are Not Allowed to Access This Page</h3></center>
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<center><h3>Please Contact Site Administrator For Help</h3></center>
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<hr><center>B612 HTTP REVERSE SERVER</center>
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</body>
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</html>`))
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return
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}
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proxy.ServeHTTP(writer, request)
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})
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}
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h.httpserver = http.Server{
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Addr: fmt.Sprintf("%s:%d", h.Addr, h.Port),
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Handler: &h.httpmux,
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}
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starlog.Infoln(h.Name + " Listening on " + h.Addr + ":" + strconv.Itoa(h.Port))
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if !h.UsingSSL {
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if err := h.httpserver.ListenAndServe(); err != http.ErrServerClosed {
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return err
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}
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return nil
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}
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if h.httpserver.ListenAndServeTLS(h.Cert, h.Key); err != http.ErrServerClosed {
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return err
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}
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return nil
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}
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func (h *ReverseConfig) Close() error {
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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return h.httpserver.Shutdown(ctx)
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}
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func (h *ReverseConfig) dialTLS(ctx context.Context, network, addr string) (net.Conn, error) {
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conn, err := net.DialTimeout(network, addr, time.Second*20)
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if err != nil {
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return nil, err
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}
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host, _, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, err
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}
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if h.Host != "" {
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host = h.Host
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}
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cfg := &tls.Config{ServerName: host}
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tlsConn := tls.Client(conn, cfg)
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if err := tlsConn.Handshake(); err != nil {
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conn.Close()
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return nil, err
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}
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cs := tlsConn.ConnectionState()
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cert := cs.PeerCertificates[0]
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// Verify here
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if !h.SkipSSLVerify {
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err = cert.VerifyHostname(host)
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if err != nil {
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return nil, err
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}
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}
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return tlsConn, nil
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}
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func (h *ReverseConfig) init() error {
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h.proxy = make(map[string]*httputil.ReverseProxy)
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for key, val := range h.ReverseURL {
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h.proxy[key] = &httputil.ReverseProxy{
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Transport: &http.Transport{DialTLSContext: h.dialTLS},
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Director: func(req *http.Request) {
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targetQuery := val.RawQuery
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req.URL.Scheme = val.Scheme
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if h.Host == "" {
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req.Host = val.Host
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} else {
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req.Host = h.Host
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}
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req.URL.Host = val.Host
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req.URL.Path, req.URL.RawPath = joinURLPath(val, req.URL)
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if targetQuery == "" || req.URL.RawQuery == "" {
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req.URL.RawQuery = targetQuery + req.URL.RawQuery
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} else {
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req.URL.RawQuery = targetQuery + "&" + req.URL.RawQuery
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}
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},
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}
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h.proxy[key].ModifyResponse = h.ModifyResponse()
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originalDirector := h.proxy[key].Director
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h.proxy[key].Director = func(req *http.Request) {
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originalDirector(req)
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h.ModifyRequest(req, val)
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}
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}
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return nil
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}
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func (h *ReverseConfig) SetResponseHeader(resp http.ResponseWriter) {
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resp.Header().Set("X-Powered-By", "B612.ME")
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resp.Header().Set("Server", "B612/"+version)
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resp.Header().Set("X-Proxy", "B612 Reverse Proxy")
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}
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func (h *ReverseConfig) ModifyResponse() func(*http.Response) error {
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return func(resp *http.Response) error {
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for _, v := range h.OutHeader {
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resp.Header.Set(v[0], v[1])
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}
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resp.Header.Del("X-Powered-By")
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resp.Header.Del("Server")
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resp.Header.Del("X-Proxy")
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resp.Header.Set("X-Powered-By", "B612.ME")
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resp.Header.Set("Server", "B612/"+version)
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resp.Header.Set("X-Proxy", "B612 Reverse Proxy")
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if len(h.ReplaceList) != 0 && resp.ContentLength <= 20*1024*1024 && strings.Contains(resp.Header.Get("Content-Type"), "text") {
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return err
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}
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strBody := string(body)
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replaceCount := -1
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if h.ReplaceOnce {
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replaceCount = 1
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}
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for _, v := range h.ReplaceList {
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strBody = strings.Replace(strBody, v[0], v[1], replaceCount)
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}
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body = []byte(strBody)
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resp.Body = ioutil.NopCloser(bytes.NewReader(body))
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resp.ContentLength = int64(len(body))
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resp.Header.Set("Content-Length", strconv.Itoa(len(body)))
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}
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return nil
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}
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}
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func (h *ReverseConfig) ModifyRequest(req *http.Request, remote *url.URL) {
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if h.XForwardMode == 1 {
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req.Header.Set("X-Forwarded-For", strings.Split(req.RemoteAddr, ":")[0])
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} else if h.XForwardMode == 2 {
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xforward := strings.Split(strings.TrimSpace(req.Header.Get("X-Forwarded-For")), ",")
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xforward = append(xforward, strings.Split(req.RemoteAddr, ":")[0])
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req.Header.Set("X-Forwarded-For", strings.Join(xforward, ", "))
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}
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for _, v := range h.Cookie {
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req.AddCookie(&http.Cookie{
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Name: v[1],
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Value: v[2],
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Path: v[0],
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})
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}
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host := h.Host
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if host == "" {
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host = remote.Host
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}
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targetQuery := remote.RawQuery
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req.URL.Scheme = remote.Scheme
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req.URL.Host = remote.Host
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req.Host = host
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req.URL.Path, req.URL.RawPath = joinURLPath(remote, req.URL)
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if targetQuery == "" || req.URL.RawQuery == "" {
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req.URL.RawQuery = targetQuery + req.URL.RawQuery
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} else {
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req.URL.RawQuery = targetQuery + "&" + req.URL.RawQuery
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}
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for _, v := range h.InHeader {
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req.Header.Set(v[0], v[1])
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}
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}
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func (h *ReverseConfig) GiveBasicAuth(w http.ResponseWriter) {
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w.Header().Set("WWW-Authenticate", ` Basic realm="Please Enter Passwd"`)
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w.WriteHeader(401)
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w.Write([]byte(`
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<html>
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<head><title>401 Authorization Required</title></head>
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<body>
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<center><h1>401 Authorization Required</h1></center>
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<hr><center>B612 HTTP SERVER</center>
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</body>
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</html>`))
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}
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func (h *ReverseConfig) BasicAuth(w http.ResponseWriter, r *http.Request) bool {
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if h.basicAuthPwd != "" {
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if len(h.protectAuthPage) != 0 {
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for _, v := range h.protectAuthPage {
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if !(strings.Index(r.URL.Path, v) == 0 || strings.Contains(r.URL.RawQuery, v)) {
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return true
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} else {
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break
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}
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}
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}
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authHeader := strings.TrimSpace(r.Header.Get("Authorization"))
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if len(authHeader) == 0 {
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h.GiveBasicAuth(w)
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return false
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} else {
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userAuth := base64.StdEncoding.EncodeToString([]byte(h.basicAuthUser + ":" + h.basicAuthPwd))
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authStr := strings.Split(authHeader, " ")
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if strings.TrimSpace(authStr[1]) != userAuth || strings.ToLower(strings.TrimSpace(authStr[0])) != "basic" {
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h.GiveBasicAuth(w)
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return false
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}
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}
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}
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return true
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}
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func (h *ReverseConfig) filter(w http.ResponseWriter, r *http.Request) bool {
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if len(h.blackip) == 0 && len(h.whiteip) == 0 {
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return true
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}
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if len(h.whiteip) != 0 {
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if _, ok := h.whiteip[strings.Split(r.RemoteAddr, ":")[0]]; ok {
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return true
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}
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for k, v := range h.whiteip {
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if match, _ := IPinRange2(k, v, strings.Split(r.RemoteAddr, ":")[0]); match {
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return true
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}
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}
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return false
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}
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if _, ok := h.blackip[strings.Split(r.RemoteAddr, ":")[0]]; ok {
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return false
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}
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for k, v := range h.blackip {
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if match, _ := IPinRange2(k, v, strings.Split(r.RemoteAddr, ":")[0]); match {
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return false
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}
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}
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return true
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}
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func joinURLPath(a, b *url.URL) (path, rawpath string) {
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if a.RawPath == "" && b.RawPath == "" {
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return singleJoiningSlash(a.Path, b.Path), ""
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}
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// Same as singleJoiningSlash, but uses EscapedPath to determine
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// whether a slash should be added
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apath := a.EscapedPath()
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bpath := b.EscapedPath()
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aslash := strings.HasSuffix(apath, "/")
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bslash := strings.HasPrefix(bpath, "/")
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switch {
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case aslash && bslash:
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return a.Path + b.Path[1:], apath + bpath[1:]
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case !aslash && !bslash:
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return a.Path + "/" + b.Path, apath + "/" + bpath
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}
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return a.Path + b.Path, apath + bpath
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}
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func singleJoiningSlash(a, b string) string {
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aslash := strings.HasSuffix(a, "/")
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bslash := strings.HasPrefix(b, "/")
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switch {
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case aslash && bslash:
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return a + b[1:]
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case !aslash && !bslash:
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return a + "/" + b
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}
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return a + b
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}
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