136 lines
4.3 KiB
PHP
136 lines
4.3 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
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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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namespace Friendica\Module;
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use Friendica\BaseModule;
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use Friendica\Core\Logger;
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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\Model\Contact;
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use Friendica\Util\HTTPSignature;
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use Friendica\Util\Strings;
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/**
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* Magic Auth (remote authentication) module.
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*
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* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
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*/
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class Magic extends BaseModule
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{
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public static function init(array $parameters = [])
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{
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$a = DI::app();
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$ret = ['success' => false, 'url' => '', 'message' => ''];
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Logger::info('magic mdule: invoked');
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Logger::debug('args', ['request' => $_REQUEST]);
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$addr = $_REQUEST['addr'] ?? '';
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$dest = $_REQUEST['dest'] ?? '';
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$test = (!empty($_REQUEST['test']) ? intval($_REQUEST['test']) : 0);
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$owa = (!empty($_REQUEST['owa']) ? intval($_REQUEST['owa']) : 0);
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$cid = 0;
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if (!empty($addr)) {
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$cid = Contact::getIdForURL($addr);
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} elseif (!empty($dest)) {
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$cid = Contact::getIdForURL($dest);
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}
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if (!$cid) {
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Logger::info('No contact record found', $_REQUEST);
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// @TODO Finding a more elegant possibility to redirect to either internal or external URL
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$a->redirect($dest);
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}
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$contact = DBA::selectFirst('contact', ['id', 'nurl', 'url'], ['id' => $cid]);
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// Redirect if the contact is already authenticated on this site.
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if (!empty($a->contact_id) && strpos($contact['nurl'], Strings::normaliseLink(DI::baseUrl()->get())) !== false) {
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if ($test) {
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$ret['success'] = true;
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$ret['message'] .= 'Local site - you are already authenticated.' . EOL;
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return $ret;
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}
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Logger::info('Contact is already authenticated');
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System::externalRedirect($dest);
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}
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if (local_user()) {
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$user = $a->user;
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// OpenWebAuth
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if ($owa) {
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// Extract the basepath
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// NOTE: we need another solution because this does only work
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// for friendica contacts :-/ . We should have the basepath
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// of a contact also in the contact table.
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$exp = explode('/profile/', $contact['url']);
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$basepath = $exp[0];
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$header = [];
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$header['Accept'] = 'application/x-dfrn+json, application/x-zot+json';
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$header['X-Open-Web-Auth'] = Strings::getRandomHex();
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// Create a header that is signed with the local users private key.
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$header = HTTPSignature::createSig(
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$header,
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$user['prvkey'],
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'acct:' . $user['nickname'] . '@' . DI::baseUrl()->getHostname() . (DI::baseUrl()->getUrlPath() ? '/' . DI::baseUrl()->getUrlPath() : '')
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);
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// Try to get an authentication token from the other instance.
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$curlResult = DI::httpRequest()->get($basepath . '/owa', ['header' => $header]);
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if ($curlResult->isSuccess()) {
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$j = json_decode($curlResult->getBody(), true);
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if ($j['success']) {
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$token = '';
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if ($j['encrypted_token']) {
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// The token is encrypted. If the local user is really the one the other instance
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// thinks he/she is, the token can be decrypted with the local users public key.
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openssl_private_decrypt(Strings::base64UrlDecode($j['encrypted_token']), $token, $user['prvkey']);
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} else {
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$token = $j['token'];
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}
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$args = (strpbrk($dest, '?&') ? '&' : '?') . 'owt=' . $token;
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Logger::info('Redirecting', ['path' => $dest . $args]);
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System::externalRedirect($dest . $args);
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}
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}
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System::externalRedirect($dest);
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}
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}
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if ($test) {
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$ret['message'] = 'Not authenticated or invalid arguments' . EOL;
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return $ret;
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}
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// @TODO Finding a more elegant possibility to redirect to either internal or external URL
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$a->redirect($dest);
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}
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}
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