src/Module/Magic.php

   1 <?php
   2 /**
   3  * @file src/Module/Magic.php
   4  */
   5 namespace Friendica\Module;
   6
   7 use Friendica\BaseModule;
   8 use Friendica\Core\Logger;
   9 use Friendica\Core\System;
  10 use Friendica\Database\DBA;
  11 use Friendica\Model\Contact;
  12 use Friendica\Util\HTTPSignature;
  13 use Friendica\Util\Network;
  14 use Friendica\Util\Strings;
  15
  16 /**
  17  * Magic Auth (remote authentication) module.
  18  *
  19  * Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
  20  */
  21 class Magic extends BaseModule
  22 {
  23         public static function init()
  24         {
  25                 $a = self::getApp();
  26                 $ret = ['success' => false, 'url' => '', 'message' => ''];
  27                 Logger::log('magic mdule: invoked', Logger::DEBUG);
  28
  29                 Logger::log('args: ' . print_r($_REQUEST, true), Logger::DATA);
  30
  31                 $addr = $_REQUEST['addr'] ?? '';
  32                 $dest = $_REQUEST['dest'] ?? '';
  33                 $test = (!empty($_REQUEST['test']) ? intval($_REQUEST['test']) : 0);
  34                 $owa  = (!empty($_REQUEST['owa'])  ? intval($_REQUEST['owa'])  : 0);
  35                 $cid  = 0;
  36
  37                 if (!empty($addr)) {
  38                         $cid = Contact::getIdForURL($addr);
  39                 } elseif (!empty($dest)) {
  40                         $cid = Contact::getIdForURL($dest);
  41                 }
  42
  43                 if (!$cid) {
  44                         Logger::info('No contact record found', $_REQUEST);
  45                         // @TODO Finding a more elegant possibility to redirect to either internal or external URL
  46                         $a->redirect($dest);
  47                 }
  48                 $contact = DBA::selectFirst('contact', ['id', 'nurl', 'url'], ['id' => $cid]);
  49
  50                 // Redirect if the contact is already authenticated on this site.
  51                 if (!empty($a->contact) && array_key_exists('id', $a->contact) && strpos($contact['nurl'], Strings::normaliseLink(self::getApp()->getBaseURL())) !== false) {
  52                         if ($test) {
  53                                 $ret['success'] = true;
  54                                 $ret['message'] .= 'Local site - you are already authenticated.' . EOL;
  55                                 return $ret;
  56                         }
  57
  58                         Logger::log('Contact is already authenticated', Logger::DEBUG);
  59                         System::externalRedirect($dest);
  60                 }
  61
  62                 if (local_user()) {
  63                         $user = $a->user;
  64
  65                         // OpenWebAuth
  66                         if ($owa) {
  67                                 // Extract the basepath
  68                                 // NOTE: we need another solution because this does only work
  69                                 // for friendica contacts :-/ . We should have the basepath
  70                                 // of a contact also in the contact table.
  71                                 $exp = explode('/profile/', $contact['url']);
  72                                 $basepath = $exp[0];
  73
  74                                 $headers = [];
  75                                 $headers['Accept'] = 'application/x-dfrn+json, application/x-zot+json';
  76                                 $headers['X-Open-Web-Auth'] = Strings::getRandomHex();
  77
  78                                 // Create a header that is signed with the local users private key.
  79                                 $headers = HTTPSignature::createSig(
  80                                         $headers,
  81                                         $user['prvkey'],
  82                                         'acct:' . $user['nickname'] . '@' . $a->getHostName() . ($a->getURLPath() ? '/' . $a->getURLPath() : '')
  83                                 );
  84
  85                                 // Try to get an authentication token from the other instance.
  86                                 $curlResult = Network::curl($basepath . '/owa', false, ['headers' => $headers]);
  87
  88                                 if ($curlResult->isSuccess()) {
  89                                         $j = json_decode($curlResult->getBody(), true);
  90
  91                                         if ($j['success']) {
  92                                                 $token = '';
  93                                                 if ($j['encrypted_token']) {
  94                                                         // The token is encrypted. If the local user is really the one the other instance
  95                                                         // thinks he/she is, the token can be decrypted with the local users public key.
  96                                                         openssl_private_decrypt(Strings::base64UrlDecode($j['encrypted_token']), $token, $user['prvkey']);
  97                                                 } else {
  98                                                         $token = $j['token'];
  99                                                 }
 100                                                 $args = (strpbrk($dest, '?&') ? '&' : '?') . 'owt=' . $token;
 101
 102                                                 Logger::info('Redirecting', ['path' => $dest . $args]);
 103                                                 System::externalRedirect($dest . $args);
 104                                         }
 105                                 }
 106                                 System::externalRedirect($dest);
 107                         }
 108                 }
 109
 110                 if ($test) {
 111                         $ret['message'] = 'Not authenticated or invalid arguments' . EOL;
 112                         return $ret;
 113                 }
 114
 115                 // @TODO Finding a more elegant possibility to redirect to either internal or external URL
 116                 $a->redirect($dest);
 117         }
 118 }