553 lines
16 KiB
PHP
553 lines
16 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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use Friendica\App;
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use Friendica\Core\Logger;
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use Friendica\Core\Session;
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use Friendica\Core\System;
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use Friendica\Database\DBA;
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use Friendica\DI;
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use Friendica\Protocol\DFRN;
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use Friendica\Protocol\OStatus;
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use Friendica\Util\Strings;
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use Friendica\Util\XML;
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function dfrn_poll_init(App $a)
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{
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DI::auth()->withSession($a);
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$dfrn_id = $_GET['dfrn_id'] ?? '';
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$type = ($_GET['type'] ?? '') ?: 'data';
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$last_update = $_GET['last_update'] ?? '';
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$destination_url = $_GET['destination_url'] ?? '';
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$challenge = $_GET['challenge'] ?? '';
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$sec = $_GET['sec'] ?? '';
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$dfrn_version = floatval(($_GET['dfrn_version'] ?? 0.0) ?: 2.0);
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$quiet = !empty($_GET['quiet']);
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// Possibly it is an OStatus compatible server that requests a user feed
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$user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
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if (($a->argc > 1) && ($dfrn_id == '') && !strstr($user_agent, 'Friendica')) {
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$nickname = $a->argv[1];
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header("Content-type: application/atom+xml");
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echo OStatus::feed($nickname, $last_update, 10);
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exit();
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}
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$direction = -1;
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if (strpos($dfrn_id, ':') == 1) {
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$direction = intval(substr($dfrn_id, 0, 1));
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$dfrn_id = substr($dfrn_id, 2);
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}
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$hidewall = false;
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if (($dfrn_id === '') && empty($_POST['dfrn_id'])) {
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if (DI::config()->get('system', 'block_public') && !Session::isAuthenticated()) {
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throw new \Friendica\Network\HTTPException\ForbiddenException();
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}
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$user = '';
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if ($a->argc > 1) {
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$r = q("SELECT `hidewall`,`nickname` FROM `user` WHERE `user`.`nickname` = '%s' LIMIT 1",
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DBA::escape($a->argv[1])
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);
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if (!$r) {
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throw new \Friendica\Network\HTTPException\NotFoundException();
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}
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$hidewall = ($r[0]['hidewall'] && !local_user());
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$user = $r[0]['nickname'];
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}
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Logger::log('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] . ' for ' . $user);
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header("Content-type: application/atom+xml");
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echo DFRN::feed('', $user, $last_update, 0, $hidewall);
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exit();
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}
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if (($type === 'profile') && (!strlen($sec))) {
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$sql_extra = '';
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switch ($direction) {
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case -1:
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$sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
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$my_id = $dfrn_id;
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break;
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case 0:
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$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
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$my_id = '1:' . $dfrn_id;
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break;
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case 1:
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$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
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$my_id = '0:' . $dfrn_id;
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break;
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default:
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DI::baseUrl()->redirect();
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break; // NOTREACHED
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}
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$r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
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FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
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WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
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AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
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DBA::escape($a->argv[1])
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);
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if (DBA::isResult($r)) {
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$s = DI::httpRequest()->fetch($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
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Logger::log("dfrn_poll: old profile returns " . $s, Logger::DATA);
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if (strlen($s)) {
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$xml = XML::parseString($s);
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if ((int)$xml->status === 1) {
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$_SESSION['authenticated'] = 1;
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$_SESSION['visitor_id'] = $r[0]['id'];
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$_SESSION['visitor_home'] = $r[0]['url'];
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$_SESSION['visitor_handle'] = $r[0]['addr'];
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$_SESSION['visitor_visiting'] = $r[0]['uid'];
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$_SESSION['my_url'] = $r[0]['url'];
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Session::setVisitorsContacts();
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if (!$quiet) {
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info(DI::l10n()->t('%1$s welcomes %2$s', $r[0]['username'], $r[0]['name']));
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}
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// Visitors get 1 day session.
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$session_id = session_id();
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$expire = time() + 86400;
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q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s'",
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DBA::escape($expire),
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DBA::escape($session_id)
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);
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}
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}
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$profile = (count($r) > 0 && isset($r[0]['nickname']) ? $r[0]['nickname'] : '');
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if (!empty($destination_url)) {
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System::externalRedirect($destination_url);
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} else {
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DI::baseUrl()->redirect('profile/' . $profile);
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}
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}
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DI::baseUrl()->redirect();
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}
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if ($type === 'profile-check' && $dfrn_version < 2.2) {
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if ((strlen($challenge)) && (strlen($sec))) {
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DBA::delete('profile_check', ["`expire` < ?", time()]);
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$r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
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DBA::escape($sec)
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);
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if (!DBA::isResult($r)) {
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System::xmlExit(3, 'No ticket');
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// NOTREACHED
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}
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$orig_id = $r[0]['dfrn_id'];
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if (strpos($orig_id, ':')) {
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$orig_id = substr($orig_id, 2);
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}
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$c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
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intval($r[0]['cid'])
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);
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if (!DBA::isResult($c)) {
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System::xmlExit(3, 'No profile');
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}
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$contact = $c[0];
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$sent_dfrn_id = hex2bin($dfrn_id);
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$challenge = hex2bin($challenge);
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$final_dfrn_id = '';
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if (($contact['duplex']) && strlen($contact['prvkey'])) {
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openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
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openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
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} else {
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openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
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openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
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}
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$final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
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if (strpos($final_dfrn_id, ':') == 1) {
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$final_dfrn_id = substr($final_dfrn_id, 2);
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}
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if ($final_dfrn_id != $orig_id) {
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Logger::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG);
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// did not decode properly - cannot trust this site
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System::xmlExit(3, 'Bad decryption');
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}
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header("Content-type: text/xml");
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echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
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exit();
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// NOTREACHED
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} else {
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// old protocol
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switch ($direction) {
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case 1:
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$dfrn_id = '0:' . $dfrn_id;
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break;
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case 0:
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$dfrn_id = '1:' . $dfrn_id;
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break;
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default:
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break;
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}
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DBA::delete('profile_check', ["`expire` < ?", time()]);
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$r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
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DBA::escape($dfrn_id));
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if (DBA::isResult($r)) {
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System::xmlExit(1);
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return; // NOTREACHED
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}
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System::xmlExit(0);
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return; // NOTREACHED
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}
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}
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}
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function dfrn_poll_post(App $a)
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{
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$dfrn_id = $_POST['dfrn_id'] ?? '';
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$challenge = $_POST['challenge'] ?? '';
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$sec = $_POST['sec'] ?? '';
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$ptype = $_POST['type'] ?? '';
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$perm = ($_POST['perm'] ?? '') ?: 'r';
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$dfrn_version = floatval(($_GET['dfrn_version'] ?? 0.0) ?: 2.0);
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if ($ptype === 'profile-check') {
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if (strlen($challenge) && strlen($sec)) {
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Logger::log('dfrn_poll: POST: profile-check');
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DBA::delete('profile_check', ["`expire` < ?", time()]);
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$r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
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DBA::escape($sec)
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);
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if (!DBA::isResult($r)) {
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System::xmlExit(3, 'No ticket');
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// NOTREACHED
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}
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$orig_id = $r[0]['dfrn_id'];
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if (strpos($orig_id, ':')) {
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$orig_id = substr($orig_id, 2);
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}
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$c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
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intval($r[0]['cid'])
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);
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if (!DBA::isResult($c)) {
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System::xmlExit(3, 'No profile');
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}
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$contact = $c[0];
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$sent_dfrn_id = hex2bin($dfrn_id);
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$challenge = hex2bin($challenge);
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$final_dfrn_id = '';
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if ($contact['duplex'] && strlen($contact['prvkey'])) {
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openssl_private_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['prvkey']);
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openssl_private_decrypt($challenge, $decoded_challenge, $contact['prvkey']);
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} else {
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openssl_public_decrypt($sent_dfrn_id, $final_dfrn_id, $contact['pubkey']);
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openssl_public_decrypt($challenge, $decoded_challenge, $contact['pubkey']);
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}
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$final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
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if (strpos($final_dfrn_id, ':') == 1) {
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$final_dfrn_id = substr($final_dfrn_id, 2);
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}
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if ($final_dfrn_id != $orig_id) {
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Logger::log('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, Logger::DEBUG);
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// did not decode properly - cannot trust this site
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System::xmlExit(3, 'Bad decryption');
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}
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header("Content-type: text/xml");
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echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
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exit();
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// NOTREACHED
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}
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}
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$direction = -1;
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if (strpos($dfrn_id, ':') == 1) {
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$direction = intval(substr($dfrn_id, 0, 1));
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$dfrn_id = substr($dfrn_id, 2);
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}
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$r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
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DBA::escape($dfrn_id),
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DBA::escape($challenge)
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);
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if (!DBA::isResult($r)) {
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exit();
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}
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$last_update = $r[0]['last_update'];
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DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]);
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$sql_extra = '';
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switch ($direction) {
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case -1:
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$sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
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break;
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case 0:
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$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
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break;
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case 1:
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$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
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break;
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default:
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DI::baseUrl()->redirect();
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break; // NOTREACHED
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}
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$r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
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if (!DBA::isResult($r)) {
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exit();
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}
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$contact = $r[0];
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$contact_id = $r[0]['id'];
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// Update the writable flag if it changed
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Logger::debug('post request feed', ['post' => $_POST]);
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if ($dfrn_version >= 2.21) {
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if ($perm === 'rw') {
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$writable = 1;
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} else {
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$writable = 0;
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}
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if ($writable != $contact['writable']) {
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q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d",
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intval($writable),
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intval($contact_id)
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);
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}
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}
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header("Content-type: application/atom+xml");
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$o = DFRN::feed($dfrn_id, $a->argv[1], $last_update, $direction);
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echo $o;
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exit();
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}
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function dfrn_poll_content(App $a)
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{
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$dfrn_id = $_GET['dfrn_id'] ?? '';
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$type = ($_GET['type'] ?? '') ?: 'data';
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$last_update = $_GET['last_update'] ?? '';
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$destination_url = $_GET['destination_url'] ?? '';
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$sec = $_GET['sec'] ?? '';
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$dfrn_version = floatval(($_GET['dfrn_version'] ?? 0.0) ?: 2.0);
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$quiet = !empty($_GET['quiet']);
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$direction = -1;
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if (strpos($dfrn_id, ':') == 1) {
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$direction = intval(substr($dfrn_id, 0, 1));
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$dfrn_id = substr($dfrn_id, 2);
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}
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if ($dfrn_id != '') {
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// initial communication from external contact
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$hash = Strings::getRandomHex();
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$status = 0;
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DBA::delete('challenge', ["`expire` < ?", time()]);
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if ($type !== 'profile') {
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q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
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VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
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DBA::escape($hash),
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DBA::escape($dfrn_id),
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intval(time() + 60 ),
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DBA::escape($type),
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DBA::escape($last_update)
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);
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}
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$sql_extra = '';
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switch ($direction) {
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case -1:
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if ($type === 'profile') {
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$sql_extra = sprintf(" AND (`dfrn-id` = '%s' OR `issued-id` = '%s') ", DBA::escape($dfrn_id), DBA::escape($dfrn_id));
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} else {
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$sql_extra = sprintf(" AND `issued-id` = '%s' ", DBA::escape($dfrn_id));
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}
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$my_id = $dfrn_id;
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break;
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case 0:
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$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
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$my_id = '1:' . $dfrn_id;
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break;
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case 1:
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$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", DBA::escape($dfrn_id));
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$my_id = '0:' . $dfrn_id;
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break;
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default:
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DI::baseUrl()->redirect();
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break; // NOTREACHED
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}
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$nickname = $a->argv[1];
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$r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
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FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
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WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
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AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
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DBA::escape($nickname)
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);
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if (DBA::isResult($r)) {
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$challenge = '';
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$encrypted_id = '';
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$id_str = $my_id . '.' . mt_rand(1000, 9999);
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if (($r[0]['duplex'] && strlen($r[0]['pubkey'])) || !strlen($r[0]['prvkey'])) {
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openssl_public_encrypt($hash, $challenge, $r[0]['pubkey']);
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openssl_public_encrypt($id_str, $encrypted_id, $r[0]['pubkey']);
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} else {
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openssl_private_encrypt($hash, $challenge, $r[0]['prvkey']);
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openssl_private_encrypt($id_str, $encrypted_id, $r[0]['prvkey']);
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}
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$challenge = bin2hex($challenge);
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$encrypted_id = bin2hex($encrypted_id);
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} else {
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$status = 1;
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$challenge = '';
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$encrypted_id = '';
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}
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if (($type === 'profile') && (strlen($sec))) {
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// heluecht: I don't know why we don't fail immediately when the user or contact hadn't been found.
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// Since it doesn't make sense to continue from this point on, we now fail here. This should be safe.
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if (!DBA::isResult($r)) {
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throw new \Friendica\Network\HTTPException\NotFoundException();
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}
|
|
|
|
// URL reply
|
|
if ($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_visiting'] = $r[0]['uid'];
|
|
$_SESSION['my_url'] = $r[0]['url'];
|
|
|
|
Session::setVisitorsContacts();
|
|
|
|
if (!$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
|
|
}
|
|
}
|
|
}
|