<?php /** * @copyright Copyright (C) 2010-2021, the Friendica project * * @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/>. * */ use Friendica\App; use Friendica\Core\Logger; use Friendica\Core\Session; use Friendica\Core\System; use Friendica\Database\DBA; use Friendica\DI; use Friendica\Protocol\DFRN; use Friendica\Protocol\OStatus; use Friendica\Util\Strings; use Friendica\Util\XML; function dfrn_poll_init(App $a) { DI::auth()->withSession($a); $dfrn_id = $_GET['dfrn_id'] ?? ''; $type = ($_GET['type'] ?? '') ?: 'data'; $last_update = $_GET['last_update'] ?? ''; $destination_url = $_GET['destination_url'] ?? ''; $challenge = $_GET['challenge'] ?? ''; $sec = $_GET['sec'] ?? ''; $dfrn_version = floatval(($_GET['dfrn_version'] ?? 0.0) ?: 2.0); $quiet = !empty($_GET['quiet']); // Possibly it is an OStatus compatible server that requests a user feed $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? ''; if (($a->argc > 1) && ($dfrn_id == '') && !strstr($user_agent, 'Friendica')) { $nickname = $a->argv[1]; header("Content-type: application/atom+xml"); echo OStatus::feed($nickname, $last_update, 10); exit(); } $direction = -1; if (strpos($dfrn_id, ':') == 1) { $direction = intval(substr($dfrn_id, 0, 1)); $dfrn_id = substr($dfrn_id, 2); } $hidewall = false; if (($dfrn_id === '') && empty($_POST['dfrn_id'])) { if (DI::config()->get('system', 'block_public') && !Session::isAuthenticated()) { throw new \Friendica\Network\HTTPException\ForbiddenException(); } $user = ''; if ($a->argc > 1) { $r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1", DBA::escape($a->argv[1]) ); if (!$r) { throw new \Friendica\Network\HTTPException\NotFoundException(); } $hidewall = ($r[0]['hidewall'] && !local_user()); $user = $r[0]['nickname']; } Logger::log('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user); header("Content-type: application/atom+xml"); echo DFRN::feed('', $user, $last_update, 0, $hidewall); exit(); } if (($type === 'profile') && (!strlen($sec))) { $sql_extra = ''; switch ($direction) { case -1: $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", DBA::escape($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: DI::baseUrl()->redirect(); break; // NOTREACHED } $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname` FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid` WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s' $sql_extra LIMIT 1", DBA::escape($a->argv[1]) ); if (DBA::isResult($r)) { $s = DI::httpRequest()->fetch($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check'); Logger::log("dfrn_poll: old profile returns " . $s, Logger::DATA); if (strlen($s)) { $xml = XML::parseString($s); if ((int)$xml->status === 1) { $_SESSION['authenticated'] = 1; $_SESSION['visitor_id'] = $r[0]['id']; $_SESSION['visitor_home'] = $r[0]['url']; $_SESSION['visitor_handle'] = $r[0]['addr']; $_SESSION['visitor_visiting'] = $r[0]['uid']; $_SESSION['my_url'] = $r[0]['url']; $_SESSION['remote_comment'] = $r[0]['subscribe']; Session::setVisitorsContacts(); if (!$quiet) { info(DI::l10n()->t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name'])); } // Visitors get 1 day session. $session_id = session_id(); $expire = time() + 86400; q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'", DBA::escape($expire), DBA::escape($session_id) ); } } $profile = (count($r) > 0 && isset($r[0]['nickname']) ? $r[0]['nickname'] : ''); if (!empty($destination_url)) { System::externalRedirect($destination_url); } else { DI::baseUrl()->redirect('profile/' . $profile); } } DI::baseUrl()->redirect(); } if ($type === 'profile-check' && $dfrn_version < 2.2) { if ((strlen($challenge)) && (strlen($sec))) { DBA::delete('profile_check', ["`expire` < ?", time()]); $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1", DBA::escape($sec) ); if (!DBA::isResult($r)) { System::xmlExit(3, 'No ticket'); // NOTREACHED } $orig_id = $r[0]['dfrn_id']; if (strpos($orig_id, ':')) { $orig_id = substr($orig_id, 2); } $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($r[0]['cid']) ); if (!DBA::isResult($c)) { System::xmlExit(3, 'No profile'); } $contact = $c[0]; $sent_dfrn_id = hex2bin($dfrn_id); $challenge = hex2bin($challenge); $final_dfrn_id = ''; if (($contact['duplex']) && strlen($contact['prvkey'])) { openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']); openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']); } else { openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']); openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']); } $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.')); if (strpos($final_dfrn_id, ':') == 1) { $final_dfrn_id = substr($final_dfrn_id, 2); } if ($final_dfrn_id != $orig_id) { Logger::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG); // did not decode properly - cannot trust this site System::xmlExit(3, 'Bad decryption'); } header("Content-type: text/xml"); echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>"; exit(); // NOTREACHED } else { // old protocol switch ($direction) { case 1: $dfrn_id = '0:' . $dfrn_id; break; case 0: $dfrn_id = '1:' . $dfrn_id; break; default: break; } DBA::delete('profile_check', ["`expire` < ?", time()]); $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC", DBA::escape($dfrn_id)); if (DBA::isResult($r)) { System::xmlExit(1); return; // NOTREACHED } System::xmlExit(0); return; // NOTREACHED } } } function dfrn_poll_post(App $a) { $dfrn_id = $_POST['dfrn_id'] ?? ''; $challenge = $_POST['challenge'] ?? ''; $sec = $_POST['sec'] ?? ''; $ptype = $_POST['type'] ?? ''; $perm = ($_POST['perm'] ?? '') ?: 'r'; $dfrn_version = floatval(($_GET['dfrn_version'] ?? 0.0) ?: 2.0); if ($ptype === 'profile-check') { if (strlen($challenge) && strlen($sec)) { Logger::log('dfrn_poll: POST: profile-check'); DBA::delete('profile_check', ["`expire` < ?", time()]); $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1", DBA::escape($sec) ); if (!DBA::isResult($r)) { System::xmlExit(3, 'No ticket'); // NOTREACHED } $orig_id = $r[0]['dfrn_id']; if (strpos($orig_id, ':')) { $orig_id = substr($orig_id, 2); } $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1", intval($r[0]['cid']) ); if (!DBA::isResult($c)) { System::xmlExit(3, 'No profile'); } $contact = $c[0]; $sent_dfrn_id = hex2bin($dfrn_id); $challenge = hex2bin($challenge); $final_dfrn_id = ''; if ($contact['duplex'] && strlen($contact['prvkey'])) { openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']); openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']); } else { openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']); openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']); } $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.')); if (strpos($final_dfrn_id, ':') == 1) { $final_dfrn_id = substr($final_dfrn_id, 2); } if ($final_dfrn_id != $orig_id) { Logger::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG); // did not decode properly - cannot trust this site System::xmlExit(3, 'Bad decryption'); } header("Content-type: text/xml"); echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>"; exit(); // NOTREACHED } } $direction = -1; if (strpos($dfrn_id, ':') == 1) { $direction = intval(substr($dfrn_id, 0, 1)); $dfrn_id = substr($dfrn_id, 2); } $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1", DBA::escape($dfrn_id), DBA::escape($challenge) ); if (!DBA::isResult($r)) { exit(); } $last_update = $r[0]['last_update']; DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]); $sql_extra = ''; switch ($direction) { case -1: $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($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: DI::baseUrl()->redirect(); break; // NOTREACHED } $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1"); if (!DBA::isResult($r)) { exit(); } $contact = $r[0]; $contact_id = $r[0]['id']; // Update the writable flag if it changed Logger::debug('post request feed', ['post' => $_POST]); if ($dfrn_version >= 2.21) { if ($perm === 'rw') { $writable = 1; } else { $writable = 0; } if ($writable != $contact['writable']) { q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d", intval($writable), intval($contact_id) ); } } header("Content-type: application/atom+xml"); $o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction); echo $o; exit(); } function dfrn_poll_content(App $a) { $dfrn_id = $_GET['dfrn_id'] ?? ''; $type = ($_GET['type'] ?? '') ?: 'data'; $last_update = $_GET['last_update'] ?? ''; $destination_url = $_GET['destination_url'] ?? ''; $sec = $_GET['sec'] ?? ''; $dfrn_version = floatval(($_GET['dfrn_version'] ?? 0.0) ?: 2.0); $quiet = !empty($_GET['quiet']); $direction = -1; if (strpos($dfrn_id, ':') == 1) { $direction = intval(substr($dfrn_id, 0, 1)); $dfrn_id = substr($dfrn_id, 2); } if ($dfrn_id != '') { // initial communication from external contact $hash = Strings::getRandomHex(); $status = 0; DBA::delete('challenge', ["`expire` < ?", time()]); if ($type !== 'profile') { q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` ) VALUES( '%s', '%s', '%s', '%s', '%s' ) ", DBA::escape($hash), DBA::escape($dfrn_id), intval(time() + 60 ), DBA::escape($type), DBA::escape($last_update) ); } $sql_extra = ''; switch ($direction) { case -1: if ($type === 'profile') { $sql_extra = sprintf(" AND (`dfrn-id` = '%s' OR `issued-id` = '%s') ", DBA::escape($dfrn_id), DBA::escape($dfrn_id)); } else { $sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($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: DI::baseUrl()->redirect(); break; // NOTREACHED } $nickname = $a->argv[1]; $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname` FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid` WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s' $sql_extra LIMIT 1", DBA::escape($nickname) ); if (DBA::isResult($r)) { $challenge = ''; $encrypted_id = ''; $id_str = $my_id . '.' . mt_rand(1000, 9999); if (($r[0]['duplex'] && strlen($r[0]['pubkey'])) || !strlen($r[0]['prvkey'])) { openssl_public_encrypt($hash, $challenge, $r[0]['pubkey']); openssl_public_encrypt($id_str, $encrypted_id, $r[0]['pubkey']); } else { openssl_private_encrypt($hash, $challenge, $r[0]['prvkey']); openssl_private_encrypt($id_str, $encrypted_id, $r[0]['prvkey']); } $challenge = bin2hex($challenge); $encrypted_id = bin2hex($encrypted_id); } else { $status = 1; $challenge = ''; $encrypted_id = ''; } if (($type === 'profile') && (strlen($sec))) { // heluecht: I don't know why we don't fail immediately when the user or contact hadn't been found. // Since it doesn't make sense to continue from this point on, we now fail here. This should be safe. if (!DBA::isResult($r)) { throw new \Friendica\Network\HTTPException\NotFoundException(); } // URL reply if ($dfrn_version < 2.2) { $s = DI::httpRequest()->fetch($r[0]['poll'] . '?dfrn_id=' . $encrypted_id . '&type=profile-check' . '&dfrn_version=' . DFRN_PROTOCOL_VERSION . '&challenge=' . $challenge . '&sec=' . $sec ); } else { $s = DI::httpRequest()->post($r[0]['poll'], [ 'dfrn_id' => $encrypted_id, 'type' => 'profile-check', 'dfrn_version' => DFRN_PROTOCOL_VERSION, 'challenge' => $challenge, 'sec' => $sec ])->getBody(); } Logger::log("dfrn_poll: sec profile: " . $s, Logger::DATA); if (strlen($s) && strstr($s, '<?xml')) { $xml = XML::parseString($s); Logger::debug(' profile: parsed', ['xml' => $xml]); Logger::log('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash); Logger::log('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec); if (((int) $xml->status == 0) && ($xml->challenge == $hash) && ($xml->sec == $sec)) { $_SESSION['authenticated'] = 1; $_SESSION['visitor_id'] = $r[0]['id']; $_SESSION['visitor_home'] = $r[0]['url']; $_SESSION['visitor_handle'] = $r[0]['addr']; $_SESSION['visitor_visiting'] = $r[0]['uid']; $_SESSION['my_url'] = $r[0]['url']; $_SESSION['remote_comment'] = $r[0]['subscribe']; Session::setVisitorsContacts(); if (!$quiet) { info(DI::l10n()->t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name'])); } // Visitors get 1 day session. $session_id = session_id(); $expire = time() + 86400; q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'", DBA::escape($expire), DBA::escape($session_id) ); } } $profile = ((DBA::isResult($r) && $r[0]['nickname']) ? $r[0]['nickname'] : $nickname); switch ($destination_url) { case 'profile': DI::baseUrl()->redirect('profile/' . $profile . '/profile'); break; case 'photos': DI::baseUrl()->redirect('photos/' . $profile); break; case 'status': case '': DI::baseUrl()->redirect('profile/' . $profile); break; default: $appendix = (strstr($destination_url, '?') ? '&redir=1' : '?redir=1'); DI::baseUrl()->redirect($destination_url . $appendix); break; } // NOTREACHED } else { // XML reply header("Content-type: text/xml"); echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n" . '<dfrn_poll>' . "\r\n" . "\t" . '<status>' . $status . '</status>' . "\r\n" . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n" . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n" . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n" . '</dfrn_poll>' . "\r\n"; exit(); // NOTREACHED } } }