4 * @file mod/dfrn_notify.php
5 * @brief The dfrn notify endpoint
6 * @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
8 require_once('include/items.php');
9 require_once('include/dfrn.php');
10 require_once('include/event.php');
12 require_once('library/defuse/php-encryption-1.2.1/Crypto.php');
14 function dfrn_notify_post(App $a) {
15 logger(__function__, LOGGER_TRACE);
16 $dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : '');
17 $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
18 $challenge = ((x($_POST,'challenge')) ? notags(trim($_POST['challenge'])) : '');
19 $data = ((x($_POST,'data')) ? $_POST['data'] : '');
20 $key = ((x($_POST,'key')) ? $_POST['key'] : '');
21 $rino_remote = ((x($_POST,'rino')) ? intval($_POST['rino']) : 0);
22 $dissolve = ((x($_POST,'dissolve')) ? intval($_POST['dissolve']) : 0);
23 $perm = ((x($_POST,'perm')) ? notags(trim($_POST['perm'])) : 'r');
24 $ssl_policy = ((x($_POST,'ssl_policy')) ? notags(trim($_POST['ssl_policy'])): 'none');
25 $page = ((x($_POST,'page')) ? intval($_POST['page']) : 0);
27 $forum = (($page == 1) ? 1 : 0);
28 $prv = (($page == 2) ? 1 : 0);
31 if ($dfrn_version >= 2.21) {
32 $writable = (($perm === 'rw') ? 1 : 0);
36 if (strpos($dfrn_id, ':') == 1) {
37 $direction = intval(substr($dfrn_id, 0, 1));
38 $dfrn_id = substr($dfrn_id, 2);
41 $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
45 if (! dbm::is_result($r)) {
46 logger('dfrn_notify: could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
50 $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
55 // find the local user who owns this relationship.
60 $sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
63 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
66 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
74 * be careful - $importer will contain both the contact information for the contact
75 * sending us the post, and also the user information for the person receiving it.
76 * since they are mixed together, it is easy to get them confused.
79 $r = q("SELECT `contact`.*, `contact`.`uid` AS `importer_uid`,
80 `contact`.`pubkey` AS `cpubkey`,
81 `contact`.`prvkey` AS `cprvkey`,
82 `contact`.`thumb` AS `thumb`,
83 `contact`.`url` as `url`,
84 `contact`.`name` as `senderName`,
87 LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
88 WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
89 AND `user`.`nickname` = '%s' AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1",
93 if (! dbm::is_result($r)) {
94 logger('dfrn_notify: contact not found for dfrn_id ' . $dfrn_id);
99 // $importer in this case contains the contact record for the remote contact joined with the user record of our user.
103 logger("Remote rino version: ".$rino_remote." for ".$importer["url"], LOGGER_DEBUG);
105 if ((($writable != (-1)) && ($writable != $importer['writable'])) || ($importer['forum'] != $forum) || ($importer['prv'] != $prv)) {
106 q("UPDATE `contact` SET `writable` = %d, forum = %d, prv = %d WHERE `id` = %d",
107 intval(($writable == (-1)) ? $importer['writable'] : $writable),
110 intval($importer['id'])
112 if ($writable != (-1)) {
113 $importer['writable'] = $writable;
115 $importer['forum'] = $page;
119 // if contact's ssl policy changed, update our links
121 fix_contact_ssl_policy($importer,$ssl_policy);
123 logger('dfrn_notify: received notify from ' . $importer['name'] . ' for ' . $importer['username']);
124 logger('dfrn_notify: data: ' . $data, LOGGER_DATA);
126 if ($dissolve == 1) {
129 * Relationship is dissolved permanently
132 require_once('include/Contact.php');
133 contact_remove($importer['id']);
134 logger('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
139 $rino = get_config('system', 'rino_encrypt');
140 $rino = intval($rino);
142 logger("Local rino version: " . $rino, LOGGER_DEBUG);
146 // if local rino is lower than remote rino, abort: should not happen!
147 // but only for $remote_rino > 1, because old code did't send rino version
148 if ($rino_remote_version > 1 && $rino < $rino_remote) {
149 logger("rino version '$rino_remote' is lower than supported '$rino'");
150 xml_status(0,"rino version '$rino_remote' is lower than supported '$rino'");
153 $rawkey = hex2bin(trim($key));
154 logger('rino: md5 raw key: ' . md5($rawkey));
157 if ($dfrn_version >= 2.1) {
158 if ((($importer['duplex']) && strlen($importer['cprvkey'])) || (! strlen($importer['cpubkey']))) {
159 openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']);
161 openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']);
164 if ((($importer['duplex']) && strlen($importer['cpubkey'])) || (! strlen($importer['cprvkey']))) {
165 openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']);
167 openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']);
171 #logger('rino: received key : ' . $final_key);
173 switch($rino_remote) {
177 *we got a key. old code send only the key, without RINO version.
178 * we assume RINO 1 if key and no RINO version
180 $data = dfrn::aes_decrypt(hex2bin($data), $final_key);
184 $data = Crypto::decrypt(hex2bin($data), $final_key);
185 } catch (InvalidCiphertext $ex) { // VERY IMPORTANT
188 * 1. The ciphertext was modified by the attacker,
189 * 2. The key is wrong, or
190 * 3. $ciphertext is not a valid ciphertext or was corrupted.
193 logger('The ciphertext has been tampered with!');
194 xml_status(0, 'The ciphertext has been tampered with!');
195 } catch (Ex\CryptoTestFailed $ex) {
196 logger('Cannot safely perform dencryption');
197 xml_status(0, 'CryptoTestFailed');
198 } catch (Ex\CannotPerformOperation $ex) {
199 logger('Cannot safely perform decryption');
200 xml_status(0, 'Cannot safely perform decryption');
204 logger("rino: invalid sent verision '$rino_remote'");
209 logger('rino: decrypted data: ' . $data, LOGGER_DATA);
212 $ret = dfrn::import($data, $importer);
219 function dfrn_notify_content(App $a) {
221 if(x($_GET,'dfrn_id')) {
224 * initial communication from external contact, $direction is their direction.
225 * If this is a duplex communication, ours will be the opposite.
228 $dfrn_id = notags(trim($_GET['dfrn_id']));
229 $dfrn_version = (float) $_GET['dfrn_version'];
230 $rino_remote = ((x($_GET,'rino')) ? intval($_GET['rino']) : 0);
234 logger('dfrn_notify: new notification dfrn_id=' . $dfrn_id);
237 if(strpos($dfrn_id,':') == 1) {
238 $direction = intval(substr($dfrn_id,0,1));
239 $dfrn_id = substr($dfrn_id,2);
242 $hash = random_string();
246 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
248 $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
249 VALUES( '%s', '%s', %d, '%s', '%s' ) ",
252 intval(time() + 90 ),
257 logger('dfrn_notify: challenge=' . $hash, LOGGER_DEBUG);
262 $sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
266 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
267 $my_id = '1:' . $dfrn_id;
270 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
271 $my_id = '0:' . $dfrn_id;
278 $r = q("SELECT `contact`.*, `user`.`nickname`, `user`.`page-flags` FROM `contact` LEFT JOIN `user` ON `user`.`uid` = `contact`.`uid`
279 WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s'
280 AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1",
284 if (! dbm::is_result($r)) {
288 logger("Remote rino version: ".$rino_remote." for ".$r[0]["url"], LOGGER_DEBUG);
292 $id_str = $my_id . '.' . mt_rand(1000,9999);
294 $prv_key = trim($r[0]['prvkey']);
295 $pub_key = trim($r[0]['pubkey']);
296 $dplx = intval($r[0]['duplex']);
298 if ((($dplx) && (strlen($prv_key))) || ((strlen($prv_key)) && (!(strlen($pub_key))))) {
299 openssl_private_encrypt($hash, $challenge, $prv_key);
300 openssl_private_encrypt($id_str, $encrypted_id, $prv_key);
301 } elseif (strlen($pub_key)) {
302 openssl_public_encrypt($hash, $challenge, $pub_key);
303 openssl_public_encrypt($id_str, $encrypted_id, $pub_key);
305 /// @TODO these kind of else-blocks are making the code harder to understand
309 $challenge = bin2hex($challenge);
310 $encrypted_id = bin2hex($encrypted_id);
313 $rino = get_config('system', 'rino_encrypt');
314 $rino = intval($rino);
316 logger("Local rino version: ". $rino, LOGGER_DEBUG);
318 // if requested rino is lower than enabled local rino, lower local rino version
319 // if requested rino is higher than enabled local rino, reply with local rino
320 if ($rino_remote < $rino) {
321 $rino = $rino_remote;
324 if((($r[0]['rel']) && ($r[0]['rel'] != CONTACT_IS_SHARING)) || ($r[0]['page-flags'] == PAGE_COMMUNITY)) {
330 header("Content-type: text/xml");
332 echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
333 . '<dfrn_notify>' . "\r\n"
334 . "\t" . '<status>' . $status . '</status>' . "\r\n"
335 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
336 . "\t" . '<rino>' . $rino . '</rino>' . "\r\n"
337 . "\t" . '<perm>' . $perm . '</perm>' . "\r\n"
338 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
339 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
340 . '</dfrn_notify>' . "\r\n" ;