src/Module/Magic.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, 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 Friendica\App;
  25 use Friendica\BaseModule;
  26 use Friendica\Core\L10n;
  27 use Friendica\Core\System;
  28 use Friendica\Database\Database;
  29 use Friendica\Model\Contact;
  30 use Friendica\Model\User;
  31 use Friendica\Network\HTTPClient\Capability\ICanSendHttpRequests;
  32 use Friendica\Network\HTTPClient\Client\HttpClientOptions;
  33 use Friendica\Util\HTTPSignature;
  34 use Friendica\Util\Strings;
  35 use Psr\Log\LoggerInterface;
  36
  37 /**
  38  * Magic Auth (remote authentication) module.
  39  *
  40  * Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
  41  */
  42 class Magic extends BaseModule
  43 {
  44         /** @var App */
  45         protected $app;
  46         /** @var LoggerInterface */
  47         protected $logger;
  48         /** @var Database */
  49         protected $dba;
  50         /** @var ICanSendHttpRequests */
  51         protected $httpClient;
  52         protected $baseUrl;
  53
  54         public function __construct(App $app, App\BaseURL $baseUrl, LoggerInterface $logger, Database $dba, ICanSendHttpRequests $httpClient, L10n $l10n, array $parameters = [])
  55         {
  56                 parent::__construct($l10n, $parameters);
  57
  58                 $this->app        = $app;
  59                 $this->logger     = $logger;
  60                 $this->dba        = $dba;
  61                 $this->httpClient = $httpClient;
  62                 $this->baseUrl    = $baseUrl;
  63         }
  64
  65         public function rawContent()
  66         {
  67                 $this->logger->info('magic module: invoked');
  68
  69                 $this->logger->debug('args', ['request' => $_REQUEST]);
  70
  71                 $addr = $_REQUEST['addr'] ?? '';
  72                 $dest = $_REQUEST['dest'] ?? '';
  73                 $owa  = (!empty($_REQUEST['owa'])  ? intval($_REQUEST['owa'])  : 0);
  74                 $cid  = 0;
  75
  76                 if (!empty($addr)) {
  77                         $cid = Contact::getIdForURL($addr);
  78                 } elseif (!empty($dest)) {
  79                         $cid = Contact::getIdForURL($dest);
  80                 }
  81
  82                 if (!$cid) {
  83                         $this->logger->info('No contact record found', $_REQUEST);
  84                         // @TODO Finding a more elegant possibility to redirect to either internal or external URL
  85                         $this->app->redirect($dest);
  86                 }
  87                 $contact = $this->dba->selectFirst('contact', ['id', 'nurl', 'url'], ['id' => $cid]);
  88
  89                 // Redirect if the contact is already authenticated on this site.
  90                 if ($this->app->getContactId() && strpos($contact['nurl'], Strings::normaliseLink($this->baseUrl->get())) !== false) {
  91                         $this->logger->info('Contact is already authenticated');
  92                         System::externalRedirect($dest);
  93                 }
  94
  95                 // OpenWebAuth
  96                 if (local_user() && $owa) {
  97                         $user = User::getById(local_user());
  98
  99                         // Extract the basepath
 100                         // NOTE: we need another solution because this does only work
 101                         // for friendica contacts :-/ . We should have the basepath
 102                         // of a contact also in the contact table.
 103                         $exp = explode('/profile/', $contact['url']);
 104                         $basepath = $exp[0];
 105
 106                         $header = [
 107                                 'Accept'                  => ['application/x-dfrn+json', 'application/x-zot+json'],
 108                                 'X-Open-Web-Auth' => [Strings::getRandomHex()],
 109                         ];
 110
 111                         // Create a header that is signed with the local users private key.
 112                         $header = HTTPSignature::createSig(
 113                                 $header,
 114                                 $user['prvkey'],
 115                                 'acct:' . $user['nickname'] . '@' . $this->baseUrl->getHostname() . ($this->baseUrl->getUrlPath() ? '/' . $this->baseUrl->getUrlPath() : '')
 116                         );
 117
 118                         // Try to get an authentication token from the other instance.
 119                         $curlResult = $this->httpClient->get($basepath . '/owa', [HttpClientOptions::HEADERS => $header]);
 120
 121                         if ($curlResult->isSuccess()) {
 122                                 $j = json_decode($curlResult->getBody(), true);
 123
 124                                 if ($j['success']) {
 125                                         $token = '';
 126                                         if ($j['encrypted_token']) {
 127                                                 // The token is encrypted. If the local user is really the one the other instance
 128                                                 // thinks he/she is, the token can be decrypted with the local users public key.
 129                                                 openssl_private_decrypt(Strings::base64UrlDecode($j['encrypted_token']), $token, $user['prvkey']);
 130                                         } else {
 131                                                 $token = $j['token'];
 132                                         }
 133                                         $args = (strpbrk($dest, '?&') ? '&' : '?') . 'owt=' . $token;
 134
 135                                         $this->logger->info('Redirecting', ['path' => $dest . $args]);
 136                                         System::externalRedirect($dest . $args);
 137                                 }
 138                         }
 139                         System::externalRedirect($dest);
 140                 }
 141
 142                 // @TODO Finding a more elegant possibility to redirect to either internal or external URL
 143                 $this->app->redirect($dest);
 144         }
 145 }