friendica/src/Module/Magic.php

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<?php
/**
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* @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/>.
*
*/
namespace Friendica\Module;
use Friendica\BaseModule;
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use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Contact;
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use Friendica\Model\User;
use Friendica\Network\HTTPClientOptions;
use Friendica\Util\HTTPSignature;
use Friendica\Util\Strings;
/**
* Magic Auth (remote authentication) module.
*
* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
*/
class Magic extends BaseModule
{
public static function init(array $parameters = [])
{
$a = DI::app();
$ret = ['success' => false, 'url' => '', 'message' => ''];
Logger::info('magic mdule: invoked');
Logger::debug('args', ['request' => $_REQUEST]);
$addr = $_REQUEST['addr'] ?? '';
$dest = $_REQUEST['dest'] ?? '';
$test = (!empty($_REQUEST['test']) ? intval($_REQUEST['test']) : 0);
$owa = (!empty($_REQUEST['owa']) ? intval($_REQUEST['owa']) : 0);
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$cid = 0;
if (!empty($addr)) {
$cid = Contact::getIdForURL($addr);
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} elseif (!empty($dest)) {
$cid = Contact::getIdForURL($dest);
}
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
$a->redirect($dest);
}
$contact = DBA::selectFirst('contact', ['id', 'nurl', 'url'], ['id' => $cid]);
// Redirect if the contact is already authenticated on this site.
if ($a->getContactId() && strpos($contact['nurl'], Strings::normaliseLink(DI::baseUrl()->get())) !== false) {
if ($test) {
$ret['success'] = true;
$ret['message'] .= 'Local site - you are already authenticated.' . EOL;
return $ret;
}
Logger::info('Contact is already authenticated');
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System::externalRedirect($dest);
}
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// OpenWebAuth
if (local_user() && $owa) {
$user = User::getById(local_user());
// Extract the basepath
// NOTE: we need another solution because this does only work
// for friendica contacts :-/ . We should have the basepath
// of a contact also in the contact table.
$exp = explode('/profile/', $contact['url']);
$basepath = $exp[0];
$header = [
'Accept' => ['application/x-dfrn+json', 'application/x-zot+json'],
'X-Open-Web-Auth' => [Strings::getRandomHex()],
];
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// Create a header that is signed with the local users private key.
$header = HTTPSignature::createSig(
$header,
$user['prvkey'],
'acct:' . $user['nickname'] . '@' . DI::baseUrl()->getHostname() . (DI::baseUrl()->getUrlPath() ? '/' . DI::baseUrl()->getUrlPath() : '')
);
// Try to get an authentication token from the other instance.
$curlResult = DI::httpClient()->get($basepath . '/owa', [HTTPClientOptions::HEADERS => $header]);
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if ($curlResult->isSuccess()) {
$j = json_decode($curlResult->getBody(), true);
if ($j['success']) {
$token = '';
if ($j['encrypted_token']) {
// The token is encrypted. If the local user is really the one the other instance
// thinks he/she is, the token can be decrypted with the local users public key.
openssl_private_decrypt(Strings::base64UrlDecode($j['encrypted_token']), $token, $user['prvkey']);
} else {
$token = $j['token'];
}
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$args = (strpbrk($dest, '?&') ? '&' : '?') . 'owt=' . $token;
Logger::info('Redirecting', ['path' => $dest . $args]);
System::externalRedirect($dest . $args);
}
}
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System::externalRedirect($dest);
}
if ($test) {
$ret['message'] = 'Not authenticated or invalid arguments' . EOL;
return $ret;
}
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// @TODO Finding a more elegant possibility to redirect to either internal or external URL
$a->redirect($dest);
}
}