<?php /** * @copyright Copyright (C) 2020, Friendica * * @license GNU AGPL version 3 or any later version * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as * published by the Free Software Foundation, either version 3 of the * License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <https://www.gnu.org/licenses/>. * * The dfrn notify endpoint * * @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/stable/spec/dfrn2.pdf */ use Friendica\App; use Friendica\Core\Logger; use Friendica\Core\System; use Friendica\Database\DBA; use Friendica\DI; use Friendica\Model\Contact; use Friendica\Model\User; use Friendica\Protocol\DFRN; use Friendica\Protocol\Diaspora; use Friendica\Util\Network; use Friendica\Util\Strings; function dfrn_notify_post(App $a) { Logger::log(__function__, Logger::TRACE); $postdata = Network::postdata(); if (empty($_POST) || !empty($postdata)) { $data = json_decode($postdata); if (is_object($data)) { $nick = $a->argv[1] ?? ''; $user = DBA::selectFirst('user', [], ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false]); if (!DBA::isResult($user)) { throw new \Friendica\Network\HTTPException\InternalServerErrorException(); } dfrn_dispatch_private($user, $postdata); } elseif (!dfrn_dispatch_public($postdata)) { require_once 'mod/salmon.php'; salmon_post($a, $postdata); } } $dfrn_id = (!empty($_POST['dfrn_id']) ? Strings::escapeTags(trim($_POST['dfrn_id'])) : ''); $dfrn_version = (!empty($_POST['dfrn_version']) ? (float) $_POST['dfrn_version'] : 2.0); $challenge = (!empty($_POST['challenge']) ? Strings::escapeTags(trim($_POST['challenge'])) : ''); $data = $_POST['data'] ?? ''; $key = $_POST['key'] ?? ''; $rino_remote = (!empty($_POST['rino']) ? intval($_POST['rino']) : 0); $dissolve = (!empty($_POST['dissolve']) ? intval($_POST['dissolve']) : 0); $perm = (!empty($_POST['perm']) ? Strings::escapeTags(trim($_POST['perm'])) : 'r'); $ssl_policy = (!empty($_POST['ssl_policy']) ? Strings::escapeTags(trim($_POST['ssl_policy'])): 'none'); $page = (!empty($_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::log('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]); $user = DBA::selectFirst('user', ['uid'], ['nickname' => $a->argv[1]]); if (!DBA::isResult($user)) { Logger::log('User not found for nickname ' . $a->argv[1]); System::xmlExit(3, 'User not found'); } // find the local user who owns this relationship. $condition = []; switch ($direction) { case (-1): $condition = ["(`issued-id` = ? OR `dfrn-id` = ?) AND `uid` = ?", $dfrn_id, $dfrn_id, $user['uid']]; break; case 0: $condition = ['issued-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']]; break; case 1: $condition = ['dfrn-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']]; break; default: System::xmlExit(3, 'Invalid direction'); break; // NOTREACHED } $contact = DBA::selectFirst('contact', ['id'], $condition); if (!DBA::isResult($contact)) { Logger::log('contact not found for dfrn_id ' . $dfrn_id); System::xmlExit(3, 'Contact not found'); } // $importer in this case contains the contact record for the remote contact joined with the user record of our user. $importer = DFRN::getImporter($contact['id'], $user['uid']); if ((($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::log('data: ' . $data, Logger::DATA); if ($dissolve == 1) { // Relationship is dissolved permanently Contact::remove($importer['id']); Logger::log('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']); System::xmlExit(0, 'relationship dissolved'); } $rino = DI::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 < $rino_remote) { Logger::log("rino version '$rino_remote' is lower than supported '$rino'"); System::xmlExit(0, "rino version '$rino_remote' is lower than supported '$rino'"); } $rawkey = hex2bin(trim($key)); Logger::log('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), $final_key); break; default: Logger::log("rino: invalid sent version '$rino_remote'"); System::xmlExit(0, "Invalid sent version '$rino_remote'"); } Logger::log('rino: decrypted data: ' . $data, Logger::DATA); } Logger::log('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, '', true); 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 $contact_id = Contact::getIdForURL($msg['author']); if (empty($contact_id)) { Logger::log('Contact not found for address ' . $msg['author']); System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found'); } $importer = DFRN::getImporter($contact_id); // This should never fail if (empty($importer)) { Logger::log('Contact not found for address ' . $msg['author']); System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found'); } Logger::log('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) { $msg = Diaspora::decodeRaw($postdata, $user['prvkey'] ?? ''); if (!$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::log('Contact not found for address ' . $msg['author']); System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found'); } } $importer = DFRN::getImporter($cid, $user['uid']); // This should never fail if (empty($importer)) { Logger::log('Contact not found for address ' . $msg['author']); System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found'); } Logger::log('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 $a) { if (!empty($_GET['dfrn_id'])) { /* * initial communication from external contact, $direction is their direction. * If this is a duplex communication, ours will be the opposite. */ $dfrn_id = Strings::escapeTags(trim($_GET['dfrn_id'])); $rino_remote = (!empty($_GET['rino']) ? intval($_GET['rino']) : 0); $type = ""; $last_update = ""; Logger::log('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 = Strings::getRandomHex(); $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::log('challenge=' . $hash, Logger::DATA); $user = DBA::selectFirst('user', ['uid'], ['nickname' => $a->argv[1]]); if (!DBA::isResult($user)) { Logger::log('User not found for nickname ' . $a->argv[1]); exit(); } $condition = []; switch ($direction) { case (-1): $condition = ["(`issued-id` = ? OR `dfrn-id` = ?) AND `uid` = ?", $dfrn_id, $dfrn_id, $user['uid']]; $my_id = $dfrn_id; break; case 0: $condition = ['issued-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']]; $my_id = '1:' . $dfrn_id; break; case 1: $condition = ['dfrn-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']]; $my_id = '0:' . $dfrn_id; break; default: $status = 1; $my_id = ''; break; } $contact = DBA::selectFirst('contact', ['id'], $condition); if (!DBA::isResult($contact)) { Logger::log('contact not found for dfrn_id ' . $dfrn_id); System::xmlExit(3, 'Contact not found'); } // $importer in this case contains the contact record for the remote contact joined with the user record of our user. $importer = DFRN::getImporter($contact['id'], $user['uid']); if (empty($importer)) { Logger::log('No importer data found for user ' . $a->argv[1] . ' and contact ' . $dfrn_id); exit(); } Logger::log("Remote rino version: ".$rino_remote." for ".$importer["url"], Logger::DATA); $challenge = ''; $encrypted_id = ''; $id_str = $my_id . '.' . mt_rand(1000,9999); $prv_key = trim($importer['cprvkey']); $pub_key = trim($importer['cpubkey']); $dplx = intval($importer['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 = DI::config()->get('system', 'rino_encrypt'); $rino = intval($rino); Logger::log("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 = $rino_remote; } if (($importer['rel'] && ($importer['rel'] != Contact::SHARING)) || ($importer['page-flags'] == User::PAGE_FLAGS_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"; exit(); } }