1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
// 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/setup/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.ClientAPI,
) *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.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
sessions.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.ClientAPI,
w http.ResponseWriter,
req *http.Request,
) *util.JSONResponse {
if !cfg.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
}
|
