3 * @copyright Copyright (C) 2020, Friendica
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
23 use Friendica\Core\Logger;
24 use Friendica\Core\Session;
25 use Friendica\Core\System;
26 use Friendica\Database\DBA;
28 use Friendica\Model\Contact;
29 use Friendica\Model\Profile;
30 use Friendica\Util\Strings;
32 function redir_init(App $a) {
33 if (!Session::isAuthenticated()) {
34 throw new \Friendica\Network\HTTPException\ForbiddenException(DI::l10n()->t('Access denied.'));
37 $url = $_GET['url'] ?? '';
38 $quiet = !empty($_GET['quiet']) ? '&quiet=1' : '';
40 if ($a->argc > 1 && intval($a->argv[1])) {
41 $cid = intval($a->argv[1]);
46 // Try magic auth before the legacy stuff
47 redir_magic($a, $cid, $url);
50 throw new \Friendica\Network\HTTPException\BadRequestException(DI::l10n()->t('Bad Request.'));
53 $fields = ['id', 'uid', 'nurl', 'url', 'addr', 'name', 'network', 'poll', 'issued-id', 'dfrn-id', 'duplex', 'pending'];
54 $contact = DBA::selectFirst('contact', $fields, ['id' => $cid, 'uid' => [0, local_user()]]);
55 if (!DBA::isResult($contact)) {
56 throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
59 $contact_url = $contact['url'];
61 if (!empty($a->contact['id']) && $a->contact['id'] == $cid) {
62 // Local user is already authenticated.
63 redir_check_url($contact_url, $url);
64 $a->redirect($url ?: $contact_url);
67 if ($contact['uid'] == 0 && local_user()) {
68 // Let's have a look if there is an established connection
69 // between the public contact we have found and the local user.
70 $contact = DBA::selectFirst('contact', $fields, ['nurl' => $contact['nurl'], 'uid' => local_user()]);
72 if (DBA::isResult($contact)) {
73 $cid = $contact['id'];
76 if (!empty($a->contact['id']) && $a->contact['id'] == $cid) {
77 // Local user is already authenticated.
78 redir_check_url($contact_url, $url);
79 $target_url = $url ?: $contact_url;
80 Logger::log($contact['name'] . " is already authenticated. Redirecting to " . $target_url, Logger::DEBUG);
81 $a->redirect($target_url);
86 $host = substr(DI::baseUrl()->getUrlPath() . (DI::baseUrl()->getUrlPath() ? '/' . DI::baseUrl()->getUrlPath() : ''), strpos(DI::baseUrl()->getUrlPath(), '://') + 3);
87 $remotehost = substr($contact['addr'], strpos($contact['addr'], '@') + 1);
89 // On a local instance we have to check if the local user has already authenticated
90 // with the local contact. Otherwise the local user would ask the local contact
91 // for authentification everytime he/she is visiting a profile page of the local
93 if (($host == $remotehost) && (Session::getRemoteContactID(Session::get('visitor_visiting')) == Session::get('visitor_id'))) {
94 // Remote user is already authenticated.
95 redir_check_url($contact_url, $url);
96 $target_url = $url ?: $contact_url;
97 Logger::log($contact['name'] . " is already authenticated. Redirecting to " . $target_url, Logger::DEBUG);
98 $a->redirect($target_url);
102 // Doing remote auth with dfrn.
103 if (local_user() && (!empty($contact['dfrn-id']) || !empty($contact['issued-id'])) && empty($contact['pending'])) {
104 $dfrn_id = $orig_id = (($contact['issued-id']) ? $contact['issued-id'] : $contact['dfrn-id']);
106 if ($contact['duplex'] && $contact['issued-id']) {
107 $orig_id = $contact['issued-id'];
108 $dfrn_id = '1:' . $orig_id;
110 if ($contact['duplex'] && $contact['dfrn-id']) {
111 $orig_id = $contact['dfrn-id'];
112 $dfrn_id = '0:' . $orig_id;
115 $sec = Strings::getRandomHex();
117 $fields = ['uid' => local_user(), 'cid' => $cid, 'dfrn_id' => $dfrn_id,
118 'sec' => $sec, 'expire' => time() + 45];
119 DBA::insert('profile_check', $fields);
121 Logger::log('mod_redir: ' . $contact['name'] . ' ' . $sec, Logger::DEBUG);
123 $dest = (!empty($url) ? '&destination_url=' . $url : '');
125 System::externalRedirect($contact['poll'] . '?dfrn_id=' . $dfrn_id
126 . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&type=profile&sec=' . $sec . $dest . $quiet);
130 throw new \Friendica\Network\HTTPException\BadRequestException(DI::l10n()->t('Bad Request.'));
133 // If we don't have a connected contact, redirect with
134 // the 'zrl' parameter.
135 $my_profile = Profile::getMyURL();
137 if (!empty($my_profile) && !Strings::compareLink($my_profile, $url)) {
138 $separator = strpos($url, '?') ? '&' : '?';
140 $url .= $separator . 'zrl=' . urlencode($my_profile);
143 Logger::log('redirecting to ' . $url, Logger::DEBUG);
147 function redir_magic($a, $cid, $url)
149 $visitor = Profile::getMyURL();
150 if (!empty($visitor)) {
151 Logger::info('Got my url', ['visitor' => $visitor]);
154 $contact = DBA::selectFirst('contact', ['url'], ['id' => $cid]);
155 if (!DBA::isResult($contact)) {
156 Logger::info('Contact not found', ['id' => $cid]);
157 throw new \Friendica\Network\HTTPException\NotFoundException(DI::l10n()->t('Contact not found.'));
159 $contact_url = $contact['url'];
160 redir_check_url($contact_url, $url);
161 $target_url = $url ?: $contact_url;
164 $basepath = Contact::getBasepath($contact_url);
166 // We don't use magic auth when there is no visitor, we are on the same system or we visit our own stuff
167 if (empty($visitor) || Strings::compareLink($basepath, DI::baseUrl()) || Strings::compareLink($contact_url, $visitor)) {
168 Logger::info('Redirecting without magic', ['target' => $target_url, 'visitor' => $visitor, 'contact' => $contact_url]);
169 DI::app()->redirect($target_url);
172 // Test for magic auth on the target system
173 $serverret = DI::httpRequest()->get($basepath . '/magic');
174 if ($serverret->isSuccess()) {
175 $separator = strpos($target_url, '?') ? '&' : '?';
176 $target_url .= $separator . 'zrl=' . urlencode($visitor) . '&addr=' . urlencode($contact_url);
178 Logger::info('Redirecting with magic', ['target' => $target_url, 'visitor' => $visitor, 'contact' => $contact_url]);
179 System::externalRedirect($target_url);
181 Logger::info('No magic for contact', ['contact' => $contact_url]);
185 function redir_check_url(string $contact_url, string $url)
187 if (empty($contact_url) || empty($url)) {
191 $url_host = parse_url($url, PHP_URL_HOST);
192 if (empty($url_host)) {
193 $url_host = parse_url(DI::baseUrl(), PHP_URL_HOST);
196 $contact_url_host = parse_url($contact_url, PHP_URL_HOST);
198 if ($url_host == $contact_url_host) {
202 Logger::error('URL check host mismatch', ['contact' => $contact_url, 'url' => $url]);
203 throw new \Friendica\Network\HTTPException\ForbiddenException(DI::l10n()->t('Access denied.'));