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
11 require_once('include/items.php');
12 require_once('include/dfrn.php');
13 require_once('include/event.php');
15 require_once('library/defuse/php-encryption-1.2.1/Crypto.php');
17 function dfrn_notify_post(App $a) {
18 logger(__function__, LOGGER_TRACE);
19 $dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : '');
20 $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
21 $challenge = ((x($_POST,'challenge')) ? notags(trim($_POST['challenge'])) : '');
22 $data = ((x($_POST,'data')) ? $_POST['data'] : '');
23 $key = ((x($_POST,'key')) ? $_POST['key'] : '');
24 $rino_remote = ((x($_POST,'rino')) ? intval($_POST['rino']) : 0);
25 $dissolve = ((x($_POST,'dissolve')) ? intval($_POST['dissolve']) : 0);
26 $perm = ((x($_POST,'perm')) ? notags(trim($_POST['perm'])) : 'r');
27 $ssl_policy = ((x($_POST,'ssl_policy')) ? notags(trim($_POST['ssl_policy'])): 'none');
28 $page = ((x($_POST,'page')) ? intval($_POST['page']) : 0);
30 $forum = (($page == 1) ? 1 : 0);
31 $prv = (($page == 2) ? 1 : 0);
34 if ($dfrn_version >= 2.21) {
35 $writable = (($perm === 'rw') ? 1 : 0);
39 if (strpos($dfrn_id, ':') == 1) {
40 $direction = intval(substr($dfrn_id, 0, 1));
41 $dfrn_id = substr($dfrn_id, 2);
44 $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
48 if (! dbm::is_result($r)) {
49 logger('dfrn_notify: could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
53 $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
58 // find the local user who owns this relationship.
63 $sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
66 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
69 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
77 * be careful - $importer will contain both the contact information for the contact
78 * sending us the post, and also the user information for the person receiving it.
79 * since they are mixed together, it is easy to get them confused.
82 $r = q("SELECT `contact`.*, `contact`.`uid` AS `importer_uid`,
83 `contact`.`pubkey` AS `cpubkey`,
84 `contact`.`prvkey` AS `cprvkey`,
85 `contact`.`thumb` AS `thumb`,
86 `contact`.`url` as `url`,
87 `contact`.`name` as `senderName`,
90 LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
91 WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
92 AND `user`.`nickname` = '%s' AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1",
96 if (! dbm::is_result($r)) {
97 logger('dfrn_notify: contact not found for dfrn_id ' . $dfrn_id);
102 // $importer in this case contains the contact record for the remote contact joined with the user record of our user.
106 logger("Remote rino version: ".$rino_remote." for ".$importer["url"], LOGGER_DEBUG);
108 if ((($writable != (-1)) && ($writable != $importer['writable'])) || ($importer['forum'] != $forum) || ($importer['prv'] != $prv)) {
109 q("UPDATE `contact` SET `writable` = %d, forum = %d, prv = %d WHERE `id` = %d",
110 intval(($writable == (-1)) ? $importer['writable'] : $writable),
113 intval($importer['id'])
115 if ($writable != (-1)) {
116 $importer['writable'] = $writable;
118 $importer['forum'] = $page;
122 // if contact's ssl policy changed, update our links
124 fix_contact_ssl_policy($importer,$ssl_policy);
126 logger('dfrn_notify: received notify from ' . $importer['name'] . ' for ' . $importer['username']);
127 logger('dfrn_notify: data: ' . $data, LOGGER_DATA);
129 if ($dissolve == 1) {
132 * Relationship is dissolved permanently
135 require_once('include/Contact.php');
136 contact_remove($importer['id']);
137 logger('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
142 $rino = get_config('system', 'rino_encrypt');
143 $rino = intval($rino);
145 logger("Local rino version: " . $rino, LOGGER_DEBUG);
149 // if local rino is lower than remote rino, abort: should not happen!
150 // but only for $remote_rino > 1, because old code did't send rino version
151 if ($rino_remote_version > 1 && $rino < $rino_remote) {
152 logger("rino version '$rino_remote' is lower than supported '$rino'");
153 xml_status(0,"rino version '$rino_remote' is lower than supported '$rino'");
156 $rawkey = hex2bin(trim($key));
157 logger('rino: md5 raw key: ' . md5($rawkey));
160 if ($dfrn_version >= 2.1) {
161 if ((($importer['duplex']) && strlen($importer['cprvkey'])) || (! strlen($importer['cpubkey']))) {
162 openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']);
164 openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']);
167 if ((($importer['duplex']) && strlen($importer['cpubkey'])) || (! strlen($importer['cprvkey']))) {
168 openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']);
170 openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']);
174 #logger('rino: received key : ' . $final_key);
176 switch($rino_remote) {
180 *we got a key. old code send only the key, without RINO version.
181 * we assume RINO 1 if key and no RINO version
183 $data = dfrn::aes_decrypt(hex2bin($data), $final_key);
187 $data = Crypto::decrypt(hex2bin($data), $final_key);
188 } catch (InvalidCiphertext $ex) { // VERY IMPORTANT
191 * 1. The ciphertext was modified by the attacker,
192 * 2. The key is wrong, or
193 * 3. $ciphertext is not a valid ciphertext or was corrupted.
196 logger('The ciphertext has been tampered with!');
197 xml_status(0, 'The ciphertext has been tampered with!');
198 } catch (Ex\CryptoTestFailed $ex) {
199 logger('Cannot safely perform dencryption');
200 xml_status(0, 'CryptoTestFailed');
201 } catch (Ex\CannotPerformOperation $ex) {
202 logger('Cannot safely perform decryption');
203 xml_status(0, 'Cannot safely perform decryption');
207 logger("rino: invalid sent verision '$rino_remote'");
212 logger('rino: decrypted data: ' . $data, LOGGER_DATA);
215 $ret = dfrn::import($data, $importer);
222 function dfrn_notify_content(App $a) {
224 if(x($_GET,'dfrn_id')) {
227 * initial communication from external contact, $direction is their direction.
228 * If this is a duplex communication, ours will be the opposite.
231 $dfrn_id = notags(trim($_GET['dfrn_id']));
232 $dfrn_version = (float) $_GET['dfrn_version'];
233 $rino_remote = ((x($_GET,'rino')) ? intval($_GET['rino']) : 0);
237 logger('dfrn_notify: new notification dfrn_id=' . $dfrn_id);
240 if(strpos($dfrn_id,':') == 1) {
241 $direction = intval(substr($dfrn_id,0,1));
242 $dfrn_id = substr($dfrn_id,2);
245 $hash = random_string();
249 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
251 $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
252 VALUES( '%s', '%s', %d, '%s', '%s' ) ",
255 intval(time() + 90 ),
260 logger('dfrn_notify: challenge=' . $hash, LOGGER_DEBUG);
265 $sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
269 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
270 $my_id = '1:' . $dfrn_id;
273 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
274 $my_id = '0:' . $dfrn_id;
281 $r = q("SELECT `contact`.*, `user`.`nickname`, `user`.`page-flags` FROM `contact` LEFT JOIN `user` ON `user`.`uid` = `contact`.`uid`
282 WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s'
283 AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1",
287 if (! dbm::is_result($r)) {
291 logger("Remote rino version: ".$rino_remote." for ".$r[0]["url"], LOGGER_DEBUG);
295 $id_str = $my_id . '.' . mt_rand(1000,9999);
297 $prv_key = trim($r[0]['prvkey']);
298 $pub_key = trim($r[0]['pubkey']);
299 $dplx = intval($r[0]['duplex']);
301 if ((($dplx) && (strlen($prv_key))) || ((strlen($prv_key)) && (!(strlen($pub_key))))) {
302 openssl_private_encrypt($hash, $challenge, $prv_key);
303 openssl_private_encrypt($id_str, $encrypted_id, $prv_key);
304 } elseif (strlen($pub_key)) {
305 openssl_public_encrypt($hash, $challenge, $pub_key);
306 openssl_public_encrypt($id_str, $encrypted_id, $pub_key);
308 /// @TODO these kind of else-blocks are making the code harder to understand
312 $challenge = bin2hex($challenge);
313 $encrypted_id = bin2hex($encrypted_id);
316 $rino = get_config('system', 'rino_encrypt');
317 $rino = intval($rino);
319 logger("Local rino version: ". $rino, LOGGER_DEBUG);
321 // if requested rino is lower than enabled local rino, lower local rino version
322 // if requested rino is higher than enabled local rino, reply with local rino
323 if ($rino_remote < $rino) {
324 $rino = $rino_remote;
327 if((($r[0]['rel']) && ($r[0]['rel'] != CONTACT_IS_SHARING)) || ($r[0]['page-flags'] == PAGE_COMMUNITY)) {
333 header("Content-type: text/xml");
335 echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
336 . '<dfrn_notify>' . "\r\n"
337 . "\t" . '<status>' . $status . '</status>' . "\r\n"
338 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
339 . "\t" . '<rino>' . $rino . '</rino>' . "\r\n"
340 . "\t" . '<perm>' . $perm . '</perm>' . "\r\n"
341 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
342 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
343 . '</dfrn_notify>' . "\r\n" ;