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// Copyright 2019 Parminder Singh <parmsingh129@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 routing
import (
"html/template"
"net/http"
"github.com/matrix-org/dendrite/clientapi/auth/authtypes"
"github.com/matrix-org/dendrite/clientapi/jsonerror"
"github.com/matrix-org/dendrite/internal/config"
"github.com/matrix-org/util"
)
// recaptchaTemplate is an HTML webpage template for recaptcha auth
const recaptchaTemplate = `
<html>
<head>
<title>Authentication</title>
<meta name='viewport' content='width=device-width, initial-scale=1,
user-scalable=no, minimum-scale=1.0, maximum-scale=1.0'>
<script src="https://www.google.com/recaptcha/api.js"
async defer></script>
<script src="//code.jquery.com/jquery-1.11.2.min.js"></script>
<script>
function captchaDone() {
$('#registrationForm').submit();
}
</script>
</head>
<body>
<form id="registrationForm" method="post" action="{{.myUrl}}">
<div>
<p>
Hello! We need to prevent computer programs and other automated
things from creating accounts on this server.
</p>
<p>
Please verify that you're not a robot.
</p>
<input type="hidden" name="session" value="{{.session}}" />
<div class="g-recaptcha"
data-sitekey="{{.siteKey}}"
data-callback="captchaDone">
</div>
<noscript>
<input type="submit" value="All Done" />
</noscript>
</div>
</div>
</form>
</body>
</html>
`
// successTemplate is an HTML template presented to the user after successful
// recaptcha completion
const successTemplate = `
<html>
<head>
<title>Success!</title>
<meta name='viewport' content='width=device-width, initial-scale=1,
user-scalable=no, minimum-scale=1.0, maximum-scale=1.0'>
<script>
if (window.onAuthDone) {
window.onAuthDone();
} else if (window.opener && window.opener.postMessage) {
window.opener.postMessage("authDone", "*");
}
</script>
</head>
<body>
<div>
<p>Thank you!</p>
<p>You may now close this window and return to the application.</p>
</div>
</body>
</html>
`
// serveTemplate fills template data and serves it using http.ResponseWriter
func serveTemplate(w http.ResponseWriter, templateHTML string, data map[string]string) {
t := template.Must(template.New("response").Parse(templateHTML))
if err := t.Execute(w, data); err != nil {
panic(err)
}
}
// AuthFallback implements GET and POST /auth/{authType}/fallback/web?session={sessionID}
func AuthFallback(
w http.ResponseWriter, req *http.Request, authType string,
cfg *config.Dendrite,
) *util.JSONResponse {
sessionID := req.URL.Query().Get("session")
if sessionID == "" {
return writeHTTPMessage(w, req,
"Session ID not provided",
http.StatusBadRequest,
)
}
serveRecaptcha := func() {
data := map[string]string{
"myUrl": req.URL.String(),
"session": sessionID,
"siteKey": cfg.Matrix.RecaptchaPublicKey,
}
serveTemplate(w, recaptchaTemplate, data)
}
serveSuccess := func() {
data := map[string]string{}
serveTemplate(w, successTemplate, data)
}
if req.Method == http.MethodGet {
// Handle Recaptcha
if authType == authtypes.LoginTypeRecaptcha {
if err := checkRecaptchaEnabled(cfg, w, req); err != nil {
return err
}
serveRecaptcha()
return nil
}
return &util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("Unknown auth stage type"),
}
} else if req.Method == http.MethodPost {
// Handle Recaptcha
if authType == authtypes.LoginTypeRecaptcha {
if err := checkRecaptchaEnabled(cfg, w, req); err != nil {
return err
}
clientIP := req.RemoteAddr
err := req.ParseForm()
if err != nil {
util.GetLogger(req.Context()).WithError(err).Error("req.ParseForm failed")
res := jsonerror.InternalServerError()
return &res
}
response := req.Form.Get("g-recaptcha-response")
if err := validateRecaptcha(cfg, response, clientIP); err != nil {
util.GetLogger(req.Context()).Error(err)
return err
}
// Success. Add recaptcha as a completed login flow
AddCompletedSessionStage(sessionID, authtypes.LoginTypeRecaptcha)
serveSuccess()
return nil
}
return &util.JSONResponse{
Code: http.StatusNotFound,
JSON: jsonerror.NotFound("Unknown auth stage type"),
}
}
return &util.JSONResponse{
Code: http.StatusMethodNotAllowed,
JSON: jsonerror.NotFound("Bad method"),
}
}
// checkRecaptchaEnabled creates an error response if recaptcha is not usable on homeserver.
func checkRecaptchaEnabled(
cfg *config.Dendrite,
w http.ResponseWriter,
req *http.Request,
) *util.JSONResponse {
if !cfg.Matrix.RecaptchaEnabled {
return writeHTTPMessage(w, req,
"Recaptcha login is disabled on this Homeserver",
http.StatusBadRequest,
)
}
return nil
}
// writeHTTPMessage writes the given header and message to the HTTP response writer.
// Returns an error JSONResponse obtained through httputil.LogThenError if the writing failed, otherwise nil.
func writeHTTPMessage(
w http.ResponseWriter, req *http.Request,
message string, header int,
) *util.JSONResponse {
w.WriteHeader(header)
_, err := w.Write([]byte(message))
if err != nil {
util.GetLogger(req.Context()).WithError(err).Error("w.Write failed")
res := jsonerror.InternalServerError()
return &res
}
return nil
}
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