src/Module/Magic.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2023, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Module;
  23
  24 use Exception;
  25 use Friendica\App;
  26 use Friendica\BaseModule;
  27 use Friendica\Core\L10n;
  28 use Friendica\Core\Session\Capability\IHandleUserSessions;
  29 use Friendica\Core\System;
  30 use Friendica\Database\Database;
  31 use Friendica\Model\Contact;
  32 use Friendica\Model\User;
  33 use Friendica\Network\HTTPClient\Capability\ICanSendHttpRequests;
  34 use Friendica\Network\HTTPClient\Client\HttpClientOptions;
  35 use Friendica\Util\HTTPSignature;
  36 use Friendica\Util\Profiler;
  37 use Friendica\Util\Strings;
  38 use Psr\Log\LoggerInterface;
  39
  40 /**
  41  * Magic Auth (remote authentication) module.
  42  *
  43  * Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
  44  */
  45 class Magic extends BaseModule
  46 {
  47         /** @var App */
  48         protected $app;
  49         /** @var Database */
  50         protected $dba;
  51         /** @var ICanSendHttpRequests */
  52         protected $httpClient;
  53         /** @var IHandleUserSessions */
  54         protected $userSession;
  55
  56         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 $parameters = [])
  57         {
  58                 parent::__construct($l10n, $baseUrl, $args, $logger, $profiler, $response, $server, $parameters);
  59
  60                 $this->app         = $app;
  61                 $this->dba         = $dba;
  62                 $this->httpClient  = $httpClient;
  63                 $this->userSession = $userSession;
  64         }
  65
  66         protected function rawContent(array $request = [])
  67         {
  68                 if ($_SERVER['REQUEST_METHOD'] == 'HEAD') {
  69                         $this->logger->debug('Got a HEAD request');
  70                         System::exit();
  71                 }
  72
  73                 $this->logger->debug('Invoked', ['request' => $request]);
  74
  75                 $addr  = $request['addr'] ?? '';
  76                 $dest  = $request['dest'] ?? '';
  77                 $bdest = $request['bdest'] ?? '';
  78                 $owa   = intval($request['owa'] ?? 0);
  79
  80                 // bdest is preferred as it is hex-encoded and can survive url rewrite and argument parsing
  81                 if (!empty($bdest)) {
  82                         $dest = hex2bin($bdest);
  83                         $this->logger->debug('bdest detected', ['dest' => $dest]);
  84                 }
  85
  86                 if ($addr ?: $dest) {
  87                         $contact = Contact::getByURL($addr ?: $dest);
  88                 }
  89
  90                 if (empty($contact)) {
  91                         if (!$owa) {
  92                                 $this->logger->info('No contact record found, no oWA, redirecting to destination.', ['request' => $request, 'server' => $_SERVER, 'dest' => $dest]);
  93                                 $this->app->redirect($dest);
  94                         }
  95                 } else {
  96                         // Redirect if the contact is already authenticated on this site.
  97                         if ($this->app->getContactId() && strpos($contact['nurl'], Strings::normaliseLink($this->baseUrl)) !== false) {
  98                                 $this->logger->info('Contact is already authenticated, redirecting to destination.', ['dest' => $dest]);
  99                                 System::externalRedirect($dest);
 100                         }
 101
 102                         $this->logger->debug('Contact found', ['url' => $contact['url']]);
 103                 }
 104
 105                 if (!$this->userSession->getLocalUserId() || !$owa) {
 106                         $this->logger->notice('Not logged in or not OWA, redirecting to destination.', ['uid' => $this->userSession->getLocalUserId(), 'owa' => $owa, 'dest' => $dest]);
 107                         $this->app->redirect($dest);
 108                 }
 109
 110                 // OpenWebAuth
 111                 $owner = User::getOwnerDataById($this->userSession->getLocalUserId());
 112
 113                 $gserver = $this->dba->selectFirst('gserver', ['url'], ['id' => $contact['gsid']]);
 114                 if (empty($gserver)) {
 115                         $this->logger->notice('Server not found, redirecting to destination.', ['gsid' => $contact['gsid'], 'dest' => $dest]);
 116                         System::externalRedirect($dest);
 117                 }
 118
 119                 $basepath = $gserver['url'];
 120
 121                 $header = [
 122                         'Accept'          => ['application/x-dfrn+json', 'application/x-zot+json'],
 123                         'X-Open-Web-Auth' => [Strings::getRandomHex()],
 124                 ];
 125
 126                 // Create a header that is signed with the local users private key.
 127                 $header = HTTPSignature::createSig(
 128                         $header,
 129                         $owner['prvkey'],
 130                         'acct:' . $owner['addr']
 131                 );
 132
 133                 $this->logger->info('Fetch from remote system', ['basepath' => $basepath, 'headers' => $header]);
 134
 135                 // Try to get an authentication token from the other instance.
 136                 try {
 137                         $curlResult = $this->httpClient->request('get', $basepath . '/owa', [HttpClientOptions::HEADERS => $header]);
 138                 } catch (Exception $exception) {
 139                         $this->logger->notice('URL is invalid, redirecting to destination.', ['url' => $basepath, 'error' => $exception, 'dest' => $dest]);
 140                         System::externalRedirect($dest);
 141                 }
 142                 if (!$curlResult->isSuccess()) {
 143                         $this->logger->notice('OWA request failed, redirecting to destination.', ['returncode' => $curlResult->getReturnCode(), 'dest' => $dest]);
 144                         System::externalRedirect($dest);
 145                 }
 146
 147                 $j = json_decode($curlResult->getBody(), true);
 148                 if (empty($j) || !$j['success']) {
 149                         $this->logger->notice('Invalid JSON, redirecting to destination.', ['json' => $j, 'dest' => $dest]);
 150                         $this->app->redirect($dest);
 151                 }
 152
 153                 if ($j['encrypted_token']) {
 154                         // The token is encrypted. If the local user is really the one the other instance
 155                         // thinks they is, the token can be decrypted with the local users public key.
 156                         $token = '';
 157                         openssl_private_decrypt(Strings::base64UrlDecode($j['encrypted_token']), $token, $owner['prvkey']);
 158                 } else {
 159                         $token = $j['token'];
 160                 }
 161                 $args = (strpbrk($dest, '?&') ? '&' : '?') . 'owt=' . $token;
 162
 163                 $this->logger->debug('Redirecting', ['path' => $dest . $args]);
 164                 System::externalRedirect($dest . $args);
 165         }
 166 }