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1 | <?php |
2 | /*************************************************************************** | |
3 | * Copyright (C) 2003-2008 Polytechnique.org * | |
4 | * http://opensource.polytechnique.org/ * | |
5 | * * | |
6 | * This program is free software; you can redistribute it and/or modify * | |
7 | * it under the terms of the GNU General Public License as published by * | |
8 | * the Free Software Foundation; either version 2 of the License, or * | |
9 | * (at your option) any later version. * | |
10 | * * | |
11 | * This program is distributed in the hope that it will be useful, * | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * | |
14 | * GNU General Public License for more details. * | |
15 | * * | |
16 | * You should have received a copy of the GNU General Public License * | |
17 | * along with this program; if not, write to the Free Software * | |
18 | * Foundation, Inc., * | |
19 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * | |
20 | ***************************************************************************/ | |
21 | ||
a1af4a99 AA |
22 | |
23 | /* Definitions for the OpenId Specification | |
24 | * http://openid.net/specs/openid-authentication-2_0.html | |
7eaf07e9 | 25 | * |
a1af4a99 AA |
26 | * OP Endpoint URL: https://www.polytechnique.org/openid |
27 | * OP Identifier: https://www.polytechnique.org/openid | |
b21f0bb5 AA |
28 | * User Identifier: https://www.polytechnique.org/openid/{hruid} |
29 | * OP-Local Identifier: {hruid} | |
30 | */ | |
31 | ||
32 | /* This implementation supports two modes: | |
33 | * - entering the OP Identifier, which can simply be 'polytechnique.org' | |
34 | * - entering the User Identifier, or some URL that resolves there | |
35 | * In both cases, Yadis discovery is made possible through the X-XRDS-Location | |
36 | * header. | |
7eaf07e9 | 37 | * |
b21f0bb5 AA |
38 | * In the former case, Yadis discovery is performed on /, or where it redirects; |
39 | * see platal.php. It resolves to the XRDS for this OP, and User Identifier | |
40 | * selection is performed after forcing the user to log in. This only works for | |
41 | * version 2.0 of the OpenId protocol. | |
42 | * | |
43 | * In the latter cas, Yadis discovery is performed on /openid/{hruid}. It | |
44 | * resolves ta a user-specific XRDS. This page also features HTML-based | |
45 | * discovery. This works with any version of the protocol. | |
a1af4a99 AA |
46 | */ |
47 | ||
33536353 AA |
48 | /* Testing suite is here: |
49 | * http://openidenabled.com/resources/openid-test/ | |
b21f0bb5 AA |
50 | * It only supports User Indentifiers. |
51 | * | |
52 | * To test OP Identifiers, download the JanRain PHP library and use the | |
53 | * consumer provided as an example (although it appears that a failure is | |
54 | * mistakenly reported: 'Server denied check_authentication'). | |
55 | * Reading the source of the server can also help understanding the code below. | |
33536353 AA |
56 | */ |
57 | ||
33536353 | 58 | |
24cfa984 AA |
59 | class OpenidModule extends PLModule |
60 | { | |
61 | function handlers() | |
62 | { | |
63 | return array( | |
a1af4a99 AA |
64 | 'openid' => $this->make_hook('openid', AUTH_PUBLIC), |
65 | 'openid/trust' => $this->make_hook('trust', AUTH_COOKIE), | |
ab66bf7f | 66 | 'openid/idp_xrds' => $this->make_hook('idp_xrds', AUTH_PUBLIC), |
b69727b4 | 67 | 'openid/user_xrds' => $this->make_hook('user_xrds', AUTH_PUBLIC), |
829fae6a | 68 | 'openid/melix' => $this->make_hook('melix', AUTH_PUBLIC), |
24cfa984 AA |
69 | ); |
70 | } | |
71 | ||
72 | function handler_openid(&$page, $x = null) | |
73 | { | |
a1af4a99 | 74 | $this->load('openid.inc.php'); |
b69727b4 | 75 | |
a8e858d3 | 76 | // Spec ยง4.1.2: if "openid.mode" is absent, we SHOULD assume that |
33536353 | 77 | // the request is not an OpenId message |
33536353 | 78 | if (!array_key_exists('openid_mode', $_REQUEST)) { |
b21f0bb5 | 79 | return $this->render_discovery_page($page, get_user($x)); |
24cfa984 AA |
80 | } |
81 | ||
7eaf07e9 | 82 | // Now, deal with the OpenId message |
a1af4a99 AA |
83 | $server = init_openid_server(); |
84 | $request = $server->decodeRequest(); | |
85 | ||
1bda7469 AA |
86 | // In modes 'checkid_immediate' and 'checkid_setup', the request |
87 | // needs some logic and can not be automatically answered by the server | |
88 | ||
89 | // Immediate mode | |
90 | if ($request->mode == 'checkid_immediate') { | |
91 | ||
92 | // We deny immediate requests, unless: | |
93 | // - the user identifier is known by the RP | |
94 | // - the user is logged in | |
95 | // - the user identifier matches the user logged in | |
a8e858d3 | 96 | // - the user has whitelisted the site |
1bda7469 AA |
97 | $answer = !$request->idSelect() |
98 | && S::logged() | |
99 | && $request->identity == S::user()->login() | |
100 | && is_trusted_site(S::user(), $request->trust_root); | |
101 | $response =& $request->answer($answer); | |
102 | ||
103 | // Setup mode | |
104 | } else if ($request->mode == 'checkid_setup') { | |
105 | ||
106 | // We redirect to a page where the user will authenticate | |
107 | // and confirm the use of his/her OpenId | |
a8e858d3 | 108 | // The request is saved in session before redirecting |
1bda7469 AA |
109 | S::set('openid_request', serialize($request)); |
110 | pl_redirect('openid/trust'); | |
111 | return; | |
a1af4a99 | 112 | |
33536353 AA |
113 | // Other requests can be automatically handled by the server |
114 | } else { | |
a1af4a99 | 115 | $response =& $server->handleRequest($request); |
24cfa984 AA |
116 | } |
117 | ||
a1af4a99 | 118 | $webresponse =& $server->encodeResponse($response); |
33536353 | 119 | $this->render_openid_response($webresponse); |
a1af4a99 | 120 | } |
b69727b4 | 121 | |
a1af4a99 AA |
122 | function handler_trust(&$page, $x = null) |
123 | { | |
124 | $this->load('openid.inc.php'); | |
24cfa984 | 125 | |
a1af4a99 | 126 | // Recover request in session |
087f7ecd | 127 | $request = S::v('openid_request'); |
a1af4a99 AA |
128 | if (is_null($request)) { |
129 | // There is no authentication information, something went wrong | |
130 | pl_redirect('/'); | |
131 | return; | |
a1af4a99 | 132 | } |
24cfa984 | 133 | |
b21f0bb5 AA |
134 | require_once 'Auth/OpenID/Server.php'; |
135 | $request = unserialize($request); | |
136 | ||
a1af4a99 AA |
137 | $server = init_openid_server(); |
138 | $user = S::user(); | |
b21f0bb5 AA |
139 | $identity = null; |
140 | $claimed_id = null; | |
141 | ||
142 | // Set the identity to the user currently logged in | |
143 | // if an OP Identifier was initially used | |
144 | if ($request->identity == Auth_OpenID_IDENTIFIER_SELECT) { | |
145 | $identity = $user->hruid; | |
146 | $claimed_id = get_user_openid_url($user); | |
a1af4a99 | 147 | // Check that the identity matches the user currently logged in |
b21f0bb5 AA |
148 | // if an User Identifier was initially used |
149 | } else if ($request->identity != $user->hruid) { | |
a1af4a99 AA |
150 | $response =& $request->answer(false); |
151 | $webresponse =& $server->encodeResponse($response); | |
152 | $this->render_openid_response($webresponse); | |
153 | return; | |
154 | } | |
155 | ||
12d4424c AA |
156 | // Prepare Simple Registration response fields |
157 | require_once 'Auth/OpenID/SReg.php'; | |
158 | $sreg_request = Auth_OpenID_SRegRequest::fromOpenIDRequest($request); | |
159 | $sreg_response = Auth_OpenID_SRegResponse::extractResponse($sreg_request, get_sreg_data($user)); | |
160 | ||
f8a567b5 | 161 | $whitelisted = is_trusted_site($user, $request->trust_root); |
12d4424c | 162 | |
33536353 | 163 | // Ask the user for confirmation |
7eaf07e9 | 164 | if (!$whitelisted && $_SERVER['REQUEST_METHOD'] != 'POST') { |
a1af4a99 AA |
165 | $page->changeTpl('openid/trust.tpl'); |
166 | $page->assign('relying_party', $request->trust_root); | |
12d4424c | 167 | $page->assign_by_ref('sreg_data', $sreg_response->data); |
a1af4a99 AA |
168 | return; |
169 | } | |
170 | ||
33536353 | 171 | // At this point $_SERVER['REQUEST_METHOD'] == 'POST' |
2e5fbf5e AA |
172 | |
173 | // Add 'always trusted' sites to whitelist | |
174 | if (isset($_POST['trust']) && @$_POST['always']) { | |
175 | add_trusted_site($user, $request->trust_root); | |
176 | } | |
177 | ||
b21f0bb5 | 178 | // Answer to the Relying Party |
7eaf07e9 | 179 | if ($whitelisted || isset($_POST['trust'])) { |
087f7ecd | 180 | S::kill('openid_request'); |
b21f0bb5 | 181 | $response =& $request->answer(true, null, $identity, $claimed_id); |
a1af4a99 | 182 | |
a1af4a99 AA |
183 | // Add the simple registration response values to the OpenID |
184 | // response message. | |
a1af4a99 AA |
185 | $sreg_response->toMessage($response->fields); |
186 | ||
7eaf07e9 | 187 | } else { // !$whitelisted && !isset($_POST['trust']) |
087f7ecd | 188 | S::kill('openid_request'); |
33536353 | 189 | $response =& $request->answer(false); |
a1af4a99 | 190 | } |
33536353 | 191 | |
33536353 AA |
192 | $webresponse =& $server->encodeResponse($response); |
193 | $this->render_openid_response($webresponse); | |
b69727b4 AA |
194 | } |
195 | ||
ab66bf7f AA |
196 | function handler_idp_xrds(&$page) |
197 | { | |
ab66bf7f | 198 | $this->load('openid.inc.php'); |
ab66bf7f AA |
199 | header('Content-type: application/xrds+xml'); |
200 | $page->changeTpl('openid/idp_xrds.tpl', NO_SKIN); | |
ab66bf7f AA |
201 | $page->assign('type2', Auth_OpenID_TYPE_2_0_IDP); |
202 | $page->assign('sreg', Auth_OpenID_SREG_URI); | |
203 | $page->assign('provider', get_openid_url()); | |
204 | } | |
205 | ||
b69727b4 AA |
206 | function handler_user_xrds(&$page, $x = null) |
207 | { | |
a1af4a99 | 208 | $this->load('openid.inc.php'); |
24cfa984 | 209 | |
b17873a4 AA |
210 | $user = get_user($x); |
211 | if (is_null($user)) { | |
212 | return PL_NOT_FOUND; | |
213 | } | |
214 | ||
b69727b4 AA |
215 | header('Content-type: application/xrds+xml'); |
216 | $page->changeTpl('openid/user_xrds.tpl', NO_SKIN); | |
b17873a4 AA |
217 | $page->assign('type2', Auth_OpenID_TYPE_2_0); |
218 | $page->assign('type1', Auth_OpenID_TYPE_1_1); | |
ab2a43ac | 219 | $page->assign('sreg', Auth_OpenID_SREG_URI); |
b17873a4 AA |
220 | $page->assign('provider', get_openid_url()); |
221 | $page->assign('local_id', $user->hruid); | |
24cfa984 AA |
222 | } |
223 | ||
2d8779e2 AA |
224 | function handler_melix(&$page, $x = null) |
225 | { | |
226 | $this->load('openid.inc.php'); | |
227 | $user = get_user_by_alias($x); | |
228 | ||
229 | // This will redirect to the canonic URL, which was not used | |
230 | // if this hook was triggered | |
829fae6a | 231 | return $this->render_discovery_page(&$page, $user); |
2d8779e2 AA |
232 | } |
233 | ||
a1af4a99 AA |
234 | //--------------------------------------------------------------------// |
235 | ||
236 | function render_discovery_page(&$page, $user) | |
237 | { | |
238 | ||
33536353 | 239 | // Show the documentation if this is not the OpenId page of an user |
a1af4a99 | 240 | if (is_null($user)) { |
33536353 | 241 | pl_redirect('Xorg/OpenId'); |
a1af4a99 AA |
242 | } |
243 | ||
2d8779e2 AA |
244 | // Redirect to the canonic URL if we are using an alias |
245 | // There might be a risk of redirection loop here | |
246 | // if $_SERVER was not exactly what we expect | |
247 | $current_url = 'http' . (empty($_SERVER['HTTPS']) ? '' : 's') . '://' | |
248 | . $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI']; | |
249 | $canonic_url = get_user_openid_url($user); | |
250 | if ($current_url != $canonic_url) { | |
251 | http_redirect($canonic_url); | |
252 | } | |
253 | ||
a1af4a99 AA |
254 | // Include X-XRDS-Location response-header for Yadis discovery |
255 | header('X-XRDS-Location: ' . get_user_xrds_url($user)); | |
256 | ||
a1af4a99 | 257 | $page->changeTpl('openid/openid.tpl'); |
a1af4a99 | 258 | $page->setTitle($user->fullName()); |
a8e858d3 | 259 | // Set the <link> tags for HTML-Based Discovery |
a1af4a99 AA |
260 | $page->addLink('openid.server openid2.provider', get_openid_url()); |
261 | $page->addLink('openid.delegate openid2.local_id', $user->hruid); | |
a1af4a99 AA |
262 | $page->assign_by_ref('user', $user); |
263 | ||
264 | return; | |
265 | } | |
266 | ||
33536353 | 267 | function render_openid_response($webresponse) |
a1af4a99 AA |
268 | { |
269 | if ($webresponse->code != AUTH_OPENID_HTTP_OK) { | |
270 | header(sprintf("HTTP/1.1 %d ", $webresponse->code), | |
271 | true, $webresponse->code); | |
272 | } | |
a1af4a99 AA |
273 | foreach ($webresponse->headers as $k => $v) { |
274 | header("$k: $v"); | |
275 | } | |
33536353 | 276 | header('Connection: close'); |
a1af4a99 AA |
277 | print $webresponse->body; |
278 | exit; | |
279 | } | |
24cfa984 AA |
280 | } |
281 | ||
282 | // vim:set et sw=4 sts=4 sws=4 foldmethod=marker enc=utf-8: | |
2d8779e2 | 283 | ?> |