<?php /** * @file mod/dfrn_notify.php * @brief The dfrn notify endpoint * @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf */ use Friendica\App; use Friendica\Core\Config; use Friendica\Core\System; use Friendica\Database\DBA; use Friendica\Model\Contact; use Friendica\Protocol\DFRN; use Friendica\Protocol\Diaspora; require_once 'include/items.php'; function dfrn_notify_post(App $a) { logger(__function__, LOGGER_TRACE); $postdata = file_get_contents('php://input'); if (empty($_POST) || !empty($postdata)) { $data = json_decode($postdata); if (is_object($data)) { $nick = defaults($a->argv, 1, ''); $user = DBA::selectFirst('user', [], ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false]); if (!DBA::isResult($user)) { System::httpExit(500); } dfrn_dispatch_private($user, $postdata); } elseif (!dfrn_dispatch_public($postdata)) { require_once 'mod/salmon.php'; salmon_post($a, $postdata); } } $dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : ''); $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0); $challenge = ((x($_POST,'challenge')) ? notags(trim($_POST['challenge'])) : ''); $data = ((x($_POST,'data')) ? $_POST['data'] : ''); $key = ((x($_POST,'key')) ? $_POST['key'] : ''); $rino_remote = ((x($_POST,'rino')) ? intval($_POST['rino']) : 0); $dissolve = ((x($_POST,'dissolve')) ? intval($_POST['dissolve']) : 0); $perm = ((x($_POST,'perm')) ? notags(trim($_POST['perm'])) : 'r'); $ssl_policy = ((x($_POST,'ssl_policy')) ? notags(trim($_POST['ssl_policy'])): 'none'); $page = ((x($_POST,'page')) ? intval($_POST['page']) : 0); $forum = (($page == 1) ? 1 : 0); $prv = (($page == 2) ? 1 : 0); $writable = (-1); if ($dfrn_version >= 2.21) { $writable = (($perm === 'rw') ? 1 : 0); } $direction = (-1); if (strpos($dfrn_id, ':') == 1) { $direction = intval(substr($dfrn_id, 0, 1)); $dfrn_id = substr($dfrn_id, 2); } if (!DBA::exists('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge])) { logger('could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge); System::xmlExit(3, 'Could not match challenge'); } DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]); // find the local user who owns this relationship. $sql_extra = ''; switch ($direction) { case (-1): $sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", DBA::escape($dfrn_id), DBA::escape($dfrn_id)); break; case 0: $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id)); break; case 1: $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id)); break; default: System::xmlExit(3, 'Invalid direction'); break; // NOTREACHED } /* * be careful - $importer will contain both the contact information for the contact * sending us the post, and also the user information for the person receiving it. * since they are mixed together, it is easy to get them confused. */ $r = q("SELECT `contact`.*, `contact`.`uid` AS `importer_uid`, `contact`.`pubkey` AS `cpubkey`, `contact`.`prvkey` AS `cprvkey`, `contact`.`thumb` AS `thumb`, `contact`.`url` as `url`, `contact`.`name` as `senderName`, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid` WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s' AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1", DBA::escape($a->argv[1]) ); if (!DBA::isResult($r)) { logger('contact not found for dfrn_id ' . $dfrn_id); System::xmlExit(3, 'Contact not found'); //NOTREACHED } // $importer in this case contains the contact record for the remote contact joined with the user record of our user. $importer = $r[0]; if ((($writable != (-1)) && ($writable != $importer['writable'])) || ($importer['forum'] != $forum) || ($importer['prv'] != $prv)) { $fields = ['writable' => ($writable == (-1)) ? $importer['writable'] : $writable, 'forum' => $forum, 'prv' => $prv]; DBA::update('contact', $fields, ['id' => $importer['id']]); if ($writable != (-1)) { $importer['writable'] = $writable; } $importer['forum'] = $page; } // if contact's ssl policy changed, update our links $importer = Contact::updateSslPolicy($importer, $ssl_policy); logger('data: ' . $data, LOGGER_DATA); if ($dissolve == 1) { // Relationship is dissolved permanently Contact::remove($importer['id']); logger('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']); System::xmlExit(0, 'relationship dissolved'); } $rino = Config::get('system', 'rino_encrypt'); $rino = intval($rino); if (strlen($key)) { // if local rino is lower than remote rino, abort: should not happen! // but only for $remote_rino > 1, because old code did't send rino version if ($rino_remote > 1 && $rino < $rino_remote) { logger("rino version '$rino_remote' is lower than supported '$rino'"); System::xmlExit(0, "rino version '$rino_remote' is lower than supported '$rino'"); } $rawkey = hex2bin(trim($key)); logger('rino: md5 raw key: ' . md5($rawkey), LOGGER_DATA); $final_key = ''; if ($dfrn_version >= 2.1) { if (($importer['duplex'] && strlen($importer['cprvkey'])) || !strlen($importer['cpubkey'])) { openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']); } else { openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']); } } else { if (($importer['duplex'] && strlen($importer['cpubkey'])) || !strlen($importer['cprvkey'])) { openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']); } else { openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']); } } switch ($rino_remote) { case 0: case 1: // we got a key. old code send only the key, without RINO version. // we assume RINO 1 if key and no RINO version $data = DFRN::aesDecrypt(hex2bin($data), $final_key); break; default: logger("rino: invalid sent version '$rino_remote'"); System::xmlExit(0, "Invalid sent version '$rino_remote'"); } logger('rino: decrypted data: ' . $data, LOGGER_DATA); } logger('Importing post from ' . $importer['addr'] . ' to ' . $importer['nickname'] . ' with the RINO ' . $rino_remote . ' encryption.', LOGGER_DEBUG); $ret = DFRN::import($data, $importer); System::xmlExit($ret, 'Processed'); // NOTREACHED } function dfrn_dispatch_public($postdata) { $msg = Diaspora::decodeRaw([], $postdata); if (!$msg) { // We have to fail silently to be able to hand it over to the salmon parser return false; } // Fetch the corresponding public contact $contact = Contact::getDetailsByAddr($msg['author'], 0); if (!$contact) { logger('Contact not found for address ' . $msg['author']); System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found'); } // We now have some contact, so we fetch it $importer = DBA::fetchFirst("SELECT *, `name` as `senderName`, 0 AS `importer_uid`, '' AS `uprvkey`, 'UTC' AS `timezone`, '' AS `nickname`, '' AS `sprvkey`, '' AS `spubkey`, 0 AS `page-flags`, 0 AS `account-type`, 0 AS `prvnets` FROM `contact` WHERE NOT `blocked` AND `id` = ? LIMIT 1", $contact['id']); // This should never fail if (!DBA::isResult($importer)) { logger('Contact not found for address ' . $msg['author']); System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found'); } logger('Importing post from ' . $msg['author'] . ' with the public envelope.', LOGGER_DEBUG); // Now we should be able to import it $ret = DFRN::import($msg['message'], $importer); System::xmlExit($ret, 'Done'); } function dfrn_dispatch_private($user, $postdata) { $msg = Diaspora::decodeRaw($user, $postdata); if (!$msg) { System::xmlExit(4, 'Unable to parse message'); } // Check if the user has got this contact $cid = Contact::getIdForURL($msg['author'], $user['uid']); if (!$cid) { // Otherwise there should be a public contact $cid = Contact::getIdForURL($msg['author']); if (!$cid) { logger('Contact not found for address ' . $msg['author']); System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found'); } } // We now have some contact, so we fetch it $importer = DBA::fetchFirst("SELECT *, `name` as `senderName` FROM `contact` WHERE NOT `blocked` AND `id` = ? LIMIT 1", $cid); // This should never fail if (!DBA::isResult($importer)) { logger('Contact not found for address ' . $msg['author']); System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found'); } // Set the user id. This is important if this is a public contact $importer['importer_uid'] = $user['uid']; $importer = array_merge($importer, $user); logger('Importing post from ' . $msg['author'] . ' to ' . $user['nickname'] . ' with the private envelope.', LOGGER_DEBUG); // Now we should be able to import it $ret = DFRN::import($msg['message'], $importer); System::xmlExit($ret, 'Done'); } function dfrn_notify_content(App $a) { if (x($_GET,'dfrn_id')) { /* * initial communication from external contact, $direction is their direction. * If this is a duplex communication, ours will be the opposite. */ $dfrn_id = notags(trim($_GET['dfrn_id'])); $dfrn_version = (float) $_GET['dfrn_version']; $rino_remote = ((x($_GET,'rino')) ? intval($_GET['rino']) : 0); $type = ""; $last_update = ""; logger('new notification dfrn_id=' . $dfrn_id); $direction = (-1); if (strpos($dfrn_id,':') == 1) { $direction = intval(substr($dfrn_id,0,1)); $dfrn_id = substr($dfrn_id,2); } $hash = random_string(); $status = 0; DBA::delete('challenge', ["`expire` < ?", time()]); $fields = ['challenge' => $hash, 'dfrn-id' => $dfrn_id, 'expire' => time() + 90, 'type' => $type, 'last_update' => $last_update]; DBA::insert('challenge', $fields); logger('challenge=' . $hash, LOGGER_DATA); $sql_extra = ''; switch($direction) { case (-1): $sql_extra = sprintf(" AND (`issued-id` = '%s' OR `dfrn-id` = '%s') ", DBA::escape($dfrn_id), DBA::escape($dfrn_id)); $my_id = $dfrn_id; break; case 0: $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id)); $my_id = '1:' . $dfrn_id; break; case 1: $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id)); $my_id = '0:' . $dfrn_id; break; default: $status = 1; break; // NOTREACHED } $r = q("SELECT `contact`.*, `user`.`nickname`, `user`.`page-flags` FROM `contact` LEFT JOIN `user` ON `user`.`uid` = `contact`.`uid` WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s' AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1", DBA::escape($a->argv[1]) ); if (!DBA::isResult($r)) { logger('No user data found for ' . $a->argv[1] . ' - SQL: ' . $sql_extra); killme(); } logger("Remote rino version: ".$rino_remote." for ".$r[0]["url"], LOGGER_DATA); $challenge = ''; $encrypted_id = ''; $id_str = $my_id . '.' . mt_rand(1000,9999); $prv_key = trim($r[0]['prvkey']); $pub_key = trim($r[0]['pubkey']); $dplx = intval($r[0]['duplex']); if (($dplx && strlen($prv_key)) || (strlen($prv_key) && !strlen($pub_key))) { openssl_private_encrypt($hash, $challenge, $prv_key); openssl_private_encrypt($id_str, $encrypted_id, $prv_key); } elseif (strlen($pub_key)) { openssl_public_encrypt($hash, $challenge, $pub_key); openssl_public_encrypt($id_str, $encrypted_id, $pub_key); } else { /// @TODO these kind of else-blocks are making the code harder to understand $status = 1; } $challenge = bin2hex($challenge); $encrypted_id = bin2hex($encrypted_id); $rino = Config::get('system', 'rino_encrypt'); $rino = intval($rino); logger("Local rino version: ". $rino, LOGGER_DATA); // if requested rino is lower than enabled local rino, lower local rino version // if requested rino is higher than enabled local rino, reply with local rino if ($rino_remote < $rino) { $rino = $rino_remote; } if (($r[0]['rel'] && ($r[0]['rel'] != Contact::SHARING)) || ($r[0]['page-flags'] == Contact::PAGE_COMMUNITY)) { $perm = 'rw'; } else { $perm = 'r'; } header("Content-type: text/xml"); echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n" . '<dfrn_notify>' . "\r\n" . "\t" . '<status>' . $status . '</status>' . "\r\n" . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n" . "\t" . '<rino>' . $rino . '</rino>' . "\r\n" . "\t" . '<perm>' . $perm . '</perm>' . "\r\n" . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n" . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n" . '</dfrn_notify>' . "\r\n" ; killme(); } }