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                 $addr = defaults($_REQUEST, 'addr', '');
  32                 $dest = defaults($_REQUEST, 'dest', '');
  33                 $test = (!empty($_REQUEST['test']) ? intval($_REQUEST['test']) : 0);
  34                 $owa  = (!empty($_REQUEST['owa'])  ? intval($_REQUEST['owa'])  : 0);
  35
  36                 // NOTE: I guess $dest isn't just the profile url (could be also
  37                 // other profile pages e.g. photo). We need to find a solution
  38                 // to be able to redirct to other pages than the contact profile.
  39                 $cid = Contact::getIdForURL($dest);
  40
  41                 if (!$cid && !empty($addr)) {
  42                         $cid = Contact::getIdForURL($addr);
  43                 }
  44
  45                 if (!$cid) {
  46                         Logger::log('No contact record found: ' . json_encode($_REQUEST), Logger::DEBUG);
  47                         // @TODO Finding a more elegant possibility to redirect to either internal or external URL
  48                         $a->redirect($dest);
  49                 }
  50                 $contact = DBA::selectFirst('contact', ['id', 'nurl', 'url'], ['id' => $cid]);
  51
  52                 // Redirect if the contact is already authenticated on this site.
  53                 if (!empty($a->contact) && array_key_exists('id', $a->contact) && strpos($contact['nurl'], Strings::normaliseLink(self::getApp()->getBaseURL())) !== false) {
  54                         if ($test) {
  55                                 $ret['success'] = true;
  56                                 $ret['message'] .= 'Local site - you are already authenticated.' . EOL;
  57                                 return $ret;
  58                         }
  59
  60                         Logger::log('Contact is already authenticated', Logger::DEBUG);
  61                         System::externalRedirect($dest);
  62                 }
  63
  64                 if (local_user()) {
  65                         $user = $a->user;
  66
  67                         // OpenWebAuth
  68                         if ($owa) {
  69                                 // Extract the basepath
  70                                 // NOTE: we need another solution because this does only work
  71                                 // for friendica contacts :-/ . We should have the basepath
  72                                 // of a contact also in the contact table.
  73                                 $exp = explode('/profile/', $contact['url']);
  74                                 $basepath = $exp[0];
  75
  76                                 $headers = [];
  77                                 $headers['Accept'] = 'application/x-dfrn+json, application/x-zot+json';
  78                                 $headers['X-Open-Web-Auth'] = Strings::getRandomHex();
  79
  80                                 // Create a header that is signed with the local users private key.
  81                                 $headers = HTTPSignature::createSig(
  82                                         $headers,
  83                                         $user['prvkey'],
  84                                         'acct:' . $user['nickname'] . '@' . $a->getHostName() . ($a->getURLPath() ? '/' . $a->getURLPath() : '')
  85                                 );
  86
  87                                 // Try to get an authentication token from the other instance.
  88                                 $curlResult = Network::curl($basepath . '/owa', false, $redirects, ['headers' => $headers]);
  89
  90                                 if ($curlResult->isSuccess()) {
  91                                         $j = json_decode($curlResult->getBody(), true);
  92
  93                                         if ($j['success']) {
  94                                                 $token = '';
  95                                                 if ($j['encrypted_token']) {
  96                                                         // The token is encrypted. If the local user is really the one the other instance
  97                                                         // thinks he/she is, the token can be decrypted with the local users public key.
  98                                                         openssl_private_decrypt(Strings::base64UrlDecode($j['encrypted_token']), $token, $user['prvkey']);
  99                                                 } else {
 100                                                         $token = $j['token'];
 101                                                 }
 102                                                 $x = strpbrk($dest, '?&');
 103                                                 $args = (($x) ? '&owt=' . $token : '?f=&owt=' . $token);
 104
 105                                                 System::externalRedirect($dest . $args);
 106                                         }
 107                                 }
 108                                 System::externalRedirect($dest);
 109                         }
 110                 }
 111
 112                 if ($test) {
 113                         $ret['message'] = 'Not authenticated or invalid arguments' . EOL;
 114                         return $ret;
 115                 }
 116
 117                 // @TODO Finding a more elegant possibility to redirect to either internal or external URL
 118                 $a->redirect($dest);
 119         }
 120 }