friendica/src/Module/Magic.php

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<?php
/**
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* @copyright Copyright (C) 2010-2023, 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;
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use Exception;
use Friendica\App;
use Friendica\BaseModule;
use Friendica\Core\L10n;
use Friendica\Core\Session\Capability\IHandleUserSessions;
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use Friendica\Core\System;
use Friendica\Database\Database;
use Friendica\Model\Contact;
use Friendica\Model\GServer;
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use Friendica\Model\User;
use Friendica\Network\HTTPClient\Capability\ICanSendHttpRequests;
use Friendica\Network\HTTPClient\Client\HttpClientOptions;
use Friendica\Util\HTTPSignature;
use Friendica\Util\Profiler;
use Friendica\Util\Strings;
use GuzzleHttp\Psr7\Uri;
use Psr\Log\LoggerInterface;
/**
* Magic Auth (remote authentication) module.
*
* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
*/
class Magic extends BaseModule
{
/** @var App */
protected $app;
/** @var Database */
protected $dba;
/** @var ICanSendHttpRequests */
protected $httpClient;
/** @var IHandleUserSessions */
protected $userSession;
public function __construct(App $app, L10n $l10n, App\BaseURL $baseUrl, App\Arguments $args, LoggerInterface $logger, Profiler $profiler, Response $response, Database $dba, ICanSendHttpRequests $httpClient, IHandleUserSessions $userSession, $server, array $parameters = [])
{
parent::__construct($l10n, $baseUrl, $args, $logger, $profiler, $response, $server, $parameters);
$this->app = $app;
$this->dba = $dba;
$this->httpClient = $httpClient;
$this->userSession = $userSession;
}
protected function rawContent(array $request = [])
{
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if ($_SERVER['REQUEST_METHOD'] == 'HEAD') {
$this->logger->debug('Got a HEAD request');
System::exit();
}
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$this->logger->debug('Invoked', ['request' => $request]);
$addr = $request['addr'] ?? '';
$dest = $request['dest'] ?? '';
$bdest = $request['bdest'] ?? '';
$owa = intval($request['owa'] ?? 0);
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// bdest is preferred as it is hex-encoded and can survive url rewrite and argument parsing
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if (!empty($bdest)) {
$dest = hex2bin($bdest);
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$this->logger->debug('bdest detected', ['dest' => $dest]);
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}
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$target = $dest ?: $addr;
if ($addr ?: $dest) {
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$contact = Contact::getByURL($addr ?: $dest);
}
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if (empty($contact)) {
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if (!$owa) {
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$this->logger->info('No contact record found, no oWA, redirecting to destination.', ['request' => $request, 'server' => $_SERVER, 'dest' => $dest]);
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$this->app->redirect($dest);
}
} else {
// Redirect if the contact is already authenticated on this site.
if ($this->app->getContactId() && strpos($contact['nurl'], Strings::normaliseLink($this->baseUrl)) !== false) {
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$this->logger->info('Contact is already authenticated, redirecting to destination.', ['dest' => $dest]);
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System::externalRedirect($dest);
}
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$this->logger->debug('Contact found', ['url' => $contact['url']]);
}
if (!$this->userSession->getLocalUserId() || !$owa) {
$this->logger->notice('Not logged in or not OWA, redirecting to destination.', ['uid' => $this->userSession->getLocalUserId(), 'owa' => $owa, 'dest' => $dest]);
$this->app->redirect($dest);
}
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// OpenWebAuth
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$owner = User::getOwnerDataById($this->userSession->getLocalUserId());
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if (!empty($contact['gsid'])) {
$gserver = $this->dba->selectFirst('gserver', ['url'], ['id' => $contact['gsid']]);
if (empty($gserver)) {
$this->logger->notice('Server not found, redirecting to destination.', ['gsid' => $contact['gsid'], 'dest' => $dest]);
System::externalRedirect($dest);
}
$basepath = $gserver['url'];
} elseif (GServer::check($target)) {
$basepath = (string)GServer::cleanUri(new Uri($target));
} else {
$this->logger->notice('The target is not a server path, redirecting to destination.', ['target' => $target]);
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System::externalRedirect($dest);
}
$header = [
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'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,
$owner['prvkey'],
'acct:' . $owner['addr']
);
$this->logger->info('Fetch from remote system', ['basepath' => $basepath, 'headers' => $header]);
// Try to get an authentication token from the other instance.
try {
$curlResult = $this->httpClient->request('get', $basepath . '/owa', [HttpClientOptions::HEADERS => $header]);
} catch (Exception $exception) {
$this->logger->notice('URL is invalid, redirecting to destination.', ['url' => $basepath, 'error' => $exception, 'dest' => $dest]);
System::externalRedirect($dest);
}
if (!$curlResult->isSuccess()) {
$this->logger->notice('OWA request failed, redirecting to destination.', ['returncode' => $curlResult->getReturnCode(), 'dest' => $dest]);
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System::externalRedirect($dest);
}
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$j = json_decode($curlResult->getBody(), true);
if (empty($j) || !$j['success']) {
$this->logger->notice('Invalid JSON, redirecting to destination.', ['json' => $j, 'dest' => $dest]);
$this->app->redirect($dest);
}
if ($j['encrypted_token']) {
// The token is encrypted. If the local user is really the one the other instance
// thinks they is, the token can be decrypted with the local users public key.
$token = '';
openssl_private_decrypt(Strings::base64UrlDecode($j['encrypted_token']), $token, $owner['prvkey']);
} else {
$token = $j['token'];
}
$args = (strpbrk($dest, '?&') ? '&' : '?') . 'owt=' . $token;
$this->logger->debug('Redirecting', ['path' => $dest . $args]);
System::externalRedirect($dest . $args);
}
}