Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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  1. <?php
  2. /**
  3. * @file mod/dfrn_poll.php
  4. */
  5. use Friendica\App;
  6. use Friendica\Core\Config;
  7. use Friendica\Core\L10n;
  8. use Friendica\Core\Logger;
  9. use Friendica\Core\System;
  10. use Friendica\Core\Session;
  11. use Friendica\Database\DBA;
  12. use Friendica\Module\Login;
  13. use Friendica\Protocol\DFRN;
  14. use Friendica\Protocol\OStatus;
  15. use Friendica\Util\Network;
  16. use Friendica\Util\Strings;
  17. use Friendica\Util\XML;
  18. function dfrn_poll_init(App $a)
  19. {
  20. Login::sessionAuth();
  21. $dfrn_id = defaults($_GET, 'dfrn_id' , '');
  22. $type = defaults($_GET, 'type' , 'data');
  23. $last_update = defaults($_GET, 'last_update' , '');
  24. $destination_url = defaults($_GET, 'destination_url', '');
  25. $challenge = defaults($_GET, 'challenge' , '');
  26. $sec = defaults($_GET, 'sec' , '');
  27. $dfrn_version = (float) defaults($_GET, 'dfrn_version' , 2.0);
  28. $quiet = !empty($_GET['quiet']);
  29. // Possibly it is an OStatus compatible server that requests a user feed
  30. $user_agent = defaults($_SERVER, 'HTTP_USER_AGENT', '');
  31. if (($a->argc > 1) && ($dfrn_id == '') && !strstr($user_agent, 'Friendica')) {
  32. $nickname = $a->argv[1];
  33. header("Content-type: application/atom+xml");
  34. echo OStatus::feed($nickname, $last_update, 10);
  35. exit();
  36. }
  37. $direction = -1;
  38. if (strpos($dfrn_id, ':') == 1) {
  39. $direction = intval(substr($dfrn_id, 0, 1));
  40. $dfrn_id = substr($dfrn_id, 2);
  41. }
  42. $hidewall = false;
  43. if (($dfrn_id === '') && empty($_POST['dfrn_id'])) {
  44. if (Config::get('system', 'block_public') && !Session::isAuthenticated()) {
  45. throw new \Friendica\Network\HTTPException\ForbiddenException();
  46. }
  47. $user = '';
  48. if ($a->argc > 1) {
  49. $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
  50. DBA::escape($a->argv[1])
  51. );
  52. if (!$r) {
  53. throw new \Friendica\Network\HTTPException\NotFoundException();
  54. }
  55. $hidewall = ($r[0]['hidewall'] && !local_user());
  56. $user = $r[0]['nickname'];
  57. }
  58. Logger::log('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
  59. header("Content-type: application/atom+xml");
  60. echo DFRN::feed('', $user, $last_update, 0, $hidewall);
  61. exit();
  62. }
  63. if (($type === 'profile') && (!strlen($sec))) {
  64. $sql_extra = '';
  65. switch ($direction) {
  66. case -1:
  67. $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
  68. $my_id = $dfrn_id;
  69. break;
  70. case 0:
  71. $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  72. $my_id = '1:' . $dfrn_id;
  73. break;
  74. case 1:
  75. $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  76. $my_id = '0:' . $dfrn_id;
  77. break;
  78. default:
  79. $a->internalRedirect();
  80. break; // NOTREACHED
  81. }
  82. $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  83. FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  84. WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  85. AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  86. DBA::escape($a->argv[1])
  87. );
  88. if (DBA::isResult($r)) {
  89. $s = Network::fetchUrl($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  90. Logger::log("dfrn_poll: old profile returns " . $s, Logger::DATA);
  91. if (strlen($s)) {
  92. $xml = XML::parseString($s);
  93. if ((int)$xml->status === 1) {
  94. $_SESSION['authenticated'] = 1;
  95. $_SESSION['visitor_id'] = $r[0]['id'];
  96. $_SESSION['visitor_home'] = $r[0]['url'];
  97. $_SESSION['visitor_handle'] = $r[0]['addr'];
  98. $_SESSION['visitor_visiting'] = $r[0]['uid'];
  99. $_SESSION['my_url'] = $r[0]['url'];
  100. Session::setVisitorsContacts();
  101. if (!$quiet) {
  102. info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
  103. }
  104. // Visitors get 1 day session.
  105. $session_id = session_id();
  106. $expire = time() + 86400;
  107. q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
  108. DBA::escape($expire),
  109. DBA::escape($session_id)
  110. );
  111. }
  112. }
  113. $profile = (count($r) > 0 && isset($r[0]['nickname']) ? $r[0]['nickname'] : '');
  114. if (!empty($destination_url)) {
  115. System::externalRedirect($destination_url);
  116. } else {
  117. $a->internalRedirect('profile/' . $profile);
  118. }
  119. }
  120. $a->internalRedirect();
  121. }
  122. if ($type === 'profile-check' && $dfrn_version < 2.2) {
  123. if ((strlen($challenge)) && (strlen($sec))) {
  124. DBA::delete('profile_check', ["`expire` < ?", time()]);
  125. $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
  126. DBA::escape($sec)
  127. );
  128. if (!DBA::isResult($r)) {
  129. System::xmlExit(3, 'No ticket');
  130. // NOTREACHED
  131. }
  132. $orig_id = $r[0]['dfrn_id'];
  133. if (strpos($orig_id, ':')) {
  134. $orig_id = substr($orig_id, 2);
  135. }
  136. $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
  137. intval($r[0]['cid'])
  138. );
  139. if (!DBA::isResult($c)) {
  140. System::xmlExit(3, 'No profile');
  141. }
  142. $contact = $c[0];
  143. $sent_dfrn_id = hex2bin($dfrn_id);
  144. $challenge = hex2bin($challenge);
  145. $final_dfrn_id = '';
  146. if (($contact['duplex']) && strlen($contact['prvkey'])) {
  147. openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
  148. openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
  149. } else {
  150. openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
  151. openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
  152. }
  153. $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
  154. if (strpos($final_dfrn_id, ':') == 1) {
  155. $final_dfrn_id = substr($final_dfrn_id, 2);
  156. }
  157. if ($final_dfrn_id != $orig_id) {
  158. Logger::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG);
  159. // did not decode properly - cannot trust this site
  160. System::xmlExit(3, 'Bad decryption');
  161. }
  162. header("Content-type: text/xml");
  163. echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
  164. exit();
  165. // NOTREACHED
  166. } else {
  167. // old protocol
  168. switch ($direction) {
  169. case 1:
  170. $dfrn_id = '0:' . $dfrn_id;
  171. break;
  172. case 0:
  173. $dfrn_id = '1:' . $dfrn_id;
  174. break;
  175. default:
  176. break;
  177. }
  178. DBA::delete('profile_check', ["`expire` < ?", time()]);
  179. $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
  180. DBA::escape($dfrn_id));
  181. if (DBA::isResult($r)) {
  182. System::xmlExit(1);
  183. return; // NOTREACHED
  184. }
  185. System::xmlExit(0);
  186. return; // NOTREACHED
  187. }
  188. }
  189. }
  190. function dfrn_poll_post(App $a)
  191. {
  192. $dfrn_id = defaults($_POST, 'dfrn_id' , '');
  193. $challenge = defaults($_POST, 'challenge', '');
  194. $url = defaults($_POST, 'url' , '');
  195. $sec = defaults($_POST, 'sec' , '');
  196. $ptype = defaults($_POST, 'type' , '');
  197. $perm = defaults($_POST, 'perm' , 'r');
  198. $dfrn_version = !empty($_POST['dfrn_version']) ? (float) $_POST['dfrn_version'] : 2.0;
  199. if ($ptype === 'profile-check') {
  200. if (strlen($challenge) && strlen($sec)) {
  201. Logger::log('dfrn_poll: POST: profile-check');
  202. DBA::delete('profile_check', ["`expire` < ?", time()]);
  203. $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
  204. DBA::escape($sec)
  205. );
  206. if (!DBA::isResult($r)) {
  207. System::xmlExit(3, 'No ticket');
  208. // NOTREACHED
  209. }
  210. $orig_id = $r[0]['dfrn_id'];
  211. if (strpos($orig_id, ':')) {
  212. $orig_id = substr($orig_id, 2);
  213. }
  214. $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
  215. intval($r[0]['cid'])
  216. );
  217. if (!DBA::isResult($c)) {
  218. System::xmlExit(3, 'No profile');
  219. }
  220. $contact = $c[0];
  221. $sent_dfrn_id = hex2bin($dfrn_id);
  222. $challenge = hex2bin($challenge);
  223. $final_dfrn_id = '';
  224. if ($contact['duplex'] && strlen($contact['prvkey'])) {
  225. openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
  226. openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
  227. } else {
  228. openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
  229. openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
  230. }
  231. $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
  232. if (strpos($final_dfrn_id, ':') == 1) {
  233. $final_dfrn_id = substr($final_dfrn_id, 2);
  234. }
  235. if ($final_dfrn_id != $orig_id) {
  236. Logger::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG);
  237. // did not decode properly - cannot trust this site
  238. System::xmlExit(3, 'Bad decryption');
  239. }
  240. header("Content-type: text/xml");
  241. echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
  242. exit();
  243. // NOTREACHED
  244. }
  245. }
  246. $direction = -1;
  247. if (strpos($dfrn_id, ':') == 1) {
  248. $direction = intval(substr($dfrn_id, 0, 1));
  249. $dfrn_id = substr($dfrn_id, 2);
  250. }
  251. $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
  252. DBA::escape($dfrn_id),
  253. DBA::escape($challenge)
  254. );
  255. if (!DBA::isResult($r)) {
  256. exit();
  257. }
  258. $type = $r[0]['type'];
  259. $last_update = $r[0]['last_update'];
  260. DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]);
  261. $sql_extra = '';
  262. switch ($direction) {
  263. case -1:
  264. $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
  265. break;
  266. case 0:
  267. $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  268. break;
  269. case 1:
  270. $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  271. break;
  272. default:
  273. $a->internalRedirect();
  274. break; // NOTREACHED
  275. }
  276. $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
  277. if (!DBA::isResult($r)) {
  278. exit();
  279. }
  280. $contact = $r[0];
  281. $owner_uid = $r[0]['uid'];
  282. $contact_id = $r[0]['id'];
  283. if ($type === 'reputation' && strlen($url)) {
  284. $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
  285. DBA::escape($url),
  286. intval($owner_uid)
  287. );
  288. $reputation = 0;
  289. $text = '';
  290. if (DBA::isResult($r)) {
  291. $reputation = $r[0]['rating'];
  292. $text = $r[0]['reason'];
  293. if ($r[0]['id'] == $contact_id) { // inquiring about own reputation not allowed
  294. $reputation = 0;
  295. $text = '';
  296. }
  297. }
  298. echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
  299. <reputation>
  300. <url>$url</url>
  301. <rating>$reputation</rating>
  302. <description>$text</description>
  303. </reputation>
  304. ";
  305. exit();
  306. // NOTREACHED
  307. } else {
  308. // Update the writable flag if it changed
  309. Logger::log('dfrn_poll: post request feed: ' . print_r($_POST, true), Logger::DATA);
  310. if ($dfrn_version >= 2.21) {
  311. if ($perm === 'rw') {
  312. $writable = 1;
  313. } else {
  314. $writable = 0;
  315. }
  316. if ($writable != $contact['writable']) {
  317. q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
  318. intval($writable),
  319. intval($contact_id)
  320. );
  321. }
  322. }
  323. header("Content-type: application/atom+xml");
  324. $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
  325. echo $o;
  326. exit();
  327. }
  328. }
  329. function dfrn_poll_content(App $a)
  330. {
  331. $dfrn_id = defaults($_GET, 'dfrn_id' , '');
  332. $type = defaults($_GET, 'type' , 'data');
  333. $last_update = defaults($_GET, 'last_update' , '');
  334. $destination_url = defaults($_GET, 'destination_url', '');
  335. $sec = defaults($_GET, 'sec' , '');
  336. $dfrn_version = !empty($_GET['dfrn_version']) ? (float) $_GET['dfrn_version'] : 2.0;
  337. $quiet = !empty($_GET['quiet']);
  338. $direction = -1;
  339. if (strpos($dfrn_id, ':') == 1) {
  340. $direction = intval(substr($dfrn_id, 0, 1));
  341. $dfrn_id = substr($dfrn_id, 2);
  342. }
  343. if ($dfrn_id != '') {
  344. // initial communication from external contact
  345. $hash = Strings::getRandomHex();
  346. $status = 0;
  347. DBA::delete('challenge', ["`expire` < ?", time()]);
  348. if ($type !== 'profile') {
  349. q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
  350. VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
  351. DBA::escape($hash),
  352. DBA::escape($dfrn_id),
  353. intval(time() + 60 ),
  354. DBA::escape($type),
  355. DBA::escape($last_update)
  356. );
  357. }
  358. $sql_extra = '';
  359. switch ($direction) {
  360. case -1:
  361. if ($type === 'profile') {
  362. $sql_extra = sprintf(" AND (`dfrn-id` = '%s' OR `issued-id` = '%s') ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
  363. } else {
  364. $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
  365. }
  366. $my_id = $dfrn_id;
  367. break;
  368. case 0:
  369. $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  370. $my_id = '1:' . $dfrn_id;
  371. break;
  372. case 1:
  373. $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
  374. $my_id = '0:' . $dfrn_id;
  375. break;
  376. default:
  377. $a->internalRedirect();
  378. break; // NOTREACHED
  379. }
  380. $nickname = $a->argv[1];
  381. $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  382. FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  383. WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  384. AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  385. DBA::escape($nickname)
  386. );
  387. if (DBA::isResult($r)) {
  388. $challenge = '';
  389. $encrypted_id = '';
  390. $id_str = $my_id . '.' . mt_rand(1000, 9999);
  391. if (($r[0]['duplex'] && strlen($r[0]['pubkey'])) || !strlen($r[0]['prvkey'])) {
  392. openssl_public_encrypt($hash, $challenge, $r[0]['pubkey']);
  393. openssl_public_encrypt($id_str, $encrypted_id, $r[0]['pubkey']);
  394. } else {
  395. openssl_private_encrypt($hash, $challenge, $r[0]['prvkey']);
  396. openssl_private_encrypt($id_str, $encrypted_id, $r[0]['prvkey']);
  397. }
  398. $challenge = bin2hex($challenge);
  399. $encrypted_id = bin2hex($encrypted_id);
  400. } else {
  401. $status = 1;
  402. $challenge = '';
  403. $encrypted_id = '';
  404. }
  405. if (($type === 'profile') && (strlen($sec))) {
  406. // heluecht: I don't know why we don't fail immediately when the user or contact hadn't been found.
  407. // Since it doesn't make sense to continue from this point on, we now fail here. This should be safe.
  408. if (!DBA::isResult($r)) {
  409. throw new \Friendica\Network\HTTPException\NotFoundException();
  410. }
  411. // URL reply
  412. if ($dfrn_version < 2.2) {
  413. $s = Network::fetchUrl($r[0]['poll']
  414. . '?dfrn_id=' . $encrypted_id
  415. . '&type=profile-check'
  416. . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
  417. . '&challenge=' . $challenge
  418. . '&sec=' . $sec
  419. );
  420. } else {
  421. $s = Network::post($r[0]['poll'], [
  422. 'dfrn_id' => $encrypted_id,
  423. 'type' => 'profile-check',
  424. 'dfrn_version' => DFRN_PROTOCOL_VERSION,
  425. 'challenge' => $challenge,
  426. 'sec' => $sec
  427. ])->getBody();
  428. }
  429. Logger::log("dfrn_poll: sec profile: " . $s, Logger::DATA);
  430. if (strlen($s) && strstr($s, '<?xml')) {
  431. $xml = XML::parseString($s);
  432. Logger::log('dfrn_poll: profile: parsed xml: ' . print_r($xml, true), Logger::DATA);
  433. Logger::log('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
  434. Logger::log('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
  435. if (((int) $xml->status == 0) && ($xml->challenge == $hash) && ($xml->sec == $sec)) {
  436. $_SESSION['authenticated'] = 1;
  437. $_SESSION['visitor_id'] = $r[0]['id'];
  438. $_SESSION['visitor_home'] = $r[0]['url'];
  439. $_SESSION['visitor_visiting'] = $r[0]['uid'];
  440. $_SESSION['my_url'] = $r[0]['url'];
  441. Session::setVisitorsContacts();
  442. if (!$quiet) {
  443. info(L10n::t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']) . EOL);
  444. }
  445. // Visitors get 1 day session.
  446. $session_id = session_id();
  447. $expire = time() + 86400;
  448. q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
  449. DBA::escape($expire),
  450. DBA::escape($session_id)
  451. );
  452. }
  453. }
  454. $profile = ((DBA::isResult($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname);
  455. switch ($destination_url) {
  456. case 'profile':
  457. $a->internalRedirect('profile/' . $profile . '?f=&tab=profile');
  458. break;
  459. case 'photos':
  460. $a->internalRedirect('photos/' . $profile);
  461. break;
  462. case 'status':
  463. case '':
  464. $a->internalRedirect('profile/' . $profile);
  465. break;
  466. default:
  467. $appendix = (strstr($destination_url, '?') ? '&f=&redir=1' : '?f=&redir=1');
  468. $a->redirect($destination_url . $appendix);
  469. break;
  470. }
  471. // NOTREACHED
  472. } else {
  473. // XML reply
  474. header("Content-type: text/xml");
  475. echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
  476. . '<dfrn_poll>' . "\r\n"
  477. . "\t" . '<status>' . $status . '</status>' . "\r\n"
  478. . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
  479. . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
  480. . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
  481. . '</dfrn_poll>' . "\r\n";
  482. exit();
  483. // NOTREACHED
  484. }
  485. }
  486. }