mirror of
https://github.com/matrix-org/dendrite
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0782011f54
### Pull Request Checklist This PR add support for hcaptcha.com as an alternative to Google ReCaptcha. It also makes possible for user to customize ReCaptcha URL when needed. (Such as use recaptcha.net instead of www.google.com) This feature needs manual test cuz it involves 3rd party _captcha_. Signed-off-by: `Simon Ding <dxl@plotbridge.com>` Co-authored-by: dxl <dxl@plotbridge.com>
214 lines
5.9 KiB
Go
214 lines
5.9 KiB
Go
// Copyright 2019 Parminder Singh <parmsingh129@gmail.com>
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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 routing
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import (
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"html/template"
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"net/http"
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"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
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"github.com/matrix-org/dendrite/clientapi/jsonerror"
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"github.com/matrix-org/dendrite/setup/config"
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"github.com/matrix-org/util"
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)
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// recaptchaTemplate is an HTML webpage template for recaptcha auth
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const recaptchaTemplate = `
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<html>
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<head>
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<title>Authentication</title>
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<meta name='viewport' content='width=device-width, initial-scale=1,
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user-scalable=no, minimum-scale=1.0, maximum-scale=1.0'>
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<script src="{{.apiJsUrl}}" async defer></script>
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<script src="//code.jquery.com/jquery-1.11.2.min.js"></script>
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<script>
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function captchaDone() {
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$('#registrationForm').submit();
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}
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</script>
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</head>
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<body>
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<form id="registrationForm" method="post" action="{{.myUrl}}">
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<div>
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<p>
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Hello! We need to prevent computer programs and other automated
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things from creating accounts on this server.
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</p>
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<p>
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Please verify that you're not a robot.
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</p>
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<input type="hidden" name="session" value="{{.session}}" />
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<div class="{{.sitekeyClass}}"
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data-sitekey="{{.sitekey}}"
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data-callback="captchaDone">
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</div>
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<noscript>
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<input type="submit" value="All Done" />
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</noscript>
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</div>
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</div>
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</form>
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</body>
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</html>
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`
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// successTemplate is an HTML template presented to the user after successful
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// recaptcha completion
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const successTemplate = `
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<html>
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<head>
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<title>Success!</title>
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<meta name='viewport' content='width=device-width, initial-scale=1,
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user-scalable=no, minimum-scale=1.0, maximum-scale=1.0'>
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<script>
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if (window.onAuthDone) {
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window.onAuthDone();
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} else if (window.opener && window.opener.postMessage) {
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window.opener.postMessage("authDone", "*");
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}
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</script>
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</head>
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<body>
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<div>
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<p>Thank you!</p>
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<p>You may now close this window and return to the application.</p>
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</div>
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</body>
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</html>
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`
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// serveTemplate fills template data and serves it using http.ResponseWriter
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func serveTemplate(w http.ResponseWriter, templateHTML string, data map[string]string) {
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t := template.Must(template.New("response").Parse(templateHTML))
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if err := t.Execute(w, data); err != nil {
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panic(err)
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}
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}
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// AuthFallback implements GET and POST /auth/{authType}/fallback/web?session={sessionID}
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func AuthFallback(
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w http.ResponseWriter, req *http.Request, authType string,
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cfg *config.ClientAPI,
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) *util.JSONResponse {
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sessionID := req.URL.Query().Get("session")
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if sessionID == "" {
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return writeHTTPMessage(w, req,
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"Session ID not provided",
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http.StatusBadRequest,
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)
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}
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serveRecaptcha := func() {
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data := map[string]string{
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"myUrl": req.URL.String(),
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"session": sessionID,
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"apiJsUrl": cfg.RecaptchaApiJsUrl,
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"sitekey": cfg.RecaptchaPublicKey,
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"sitekeyClass": cfg.RecaptchaSitekeyClass,
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"formField": cfg.RecaptchaFormField,
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}
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serveTemplate(w, recaptchaTemplate, data)
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}
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serveSuccess := func() {
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data := map[string]string{}
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serveTemplate(w, successTemplate, data)
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}
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if req.Method == http.MethodGet {
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// Handle Recaptcha
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if authType == authtypes.LoginTypeRecaptcha {
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if err := checkRecaptchaEnabled(cfg, w, req); err != nil {
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return err
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}
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serveRecaptcha()
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return nil
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}
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return &util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Unknown auth stage type"),
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}
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} else if req.Method == http.MethodPost {
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// Handle Recaptcha
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if authType == authtypes.LoginTypeRecaptcha {
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if err := checkRecaptchaEnabled(cfg, w, req); err != nil {
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return err
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}
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clientIP := req.RemoteAddr
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err := req.ParseForm()
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if err != nil {
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util.GetLogger(req.Context()).WithError(err).Error("req.ParseForm failed")
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res := jsonerror.InternalServerError()
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return &res
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}
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response := req.Form.Get(cfg.RecaptchaFormField)
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if err := validateRecaptcha(cfg, response, clientIP); err != nil {
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util.GetLogger(req.Context()).Error(err)
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return err
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}
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// Success. Add recaptcha as a completed login flow
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sessions.addCompletedSessionStage(sessionID, authtypes.LoginTypeRecaptcha)
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serveSuccess()
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return nil
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}
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return &util.JSONResponse{
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Code: http.StatusNotFound,
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JSON: jsonerror.NotFound("Unknown auth stage type"),
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}
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}
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return &util.JSONResponse{
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Code: http.StatusMethodNotAllowed,
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JSON: jsonerror.NotFound("Bad method"),
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}
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}
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// checkRecaptchaEnabled creates an error response if recaptcha is not usable on homeserver.
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func checkRecaptchaEnabled(
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cfg *config.ClientAPI,
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w http.ResponseWriter,
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req *http.Request,
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) *util.JSONResponse {
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if !cfg.RecaptchaEnabled {
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return writeHTTPMessage(w, req,
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"Recaptcha login is disabled on this Homeserver",
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http.StatusBadRequest,
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)
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}
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return nil
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}
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// writeHTTPMessage writes the given header and message to the HTTP response writer.
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// Returns an error JSONResponse obtained through httputil.LogThenError if the writing failed, otherwise nil.
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func writeHTTPMessage(
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w http.ResponseWriter, req *http.Request,
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message string, header int,
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) *util.JSONResponse {
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w.WriteHeader(header)
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_, err := w.Write([]byte(message))
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if err != nil {
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util.GetLogger(req.Context()).WithError(err).Error("w.Write failed")
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res := jsonerror.InternalServerError()
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return &res
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}
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return nil
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}
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