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\DI;
  12 use Friendica\Model\Contact;
  13 use Friendica\Util\HTTPSignature;
  14 use Friendica\Util\Network;
  15 use Friendica\Util\Strings;
  16
  17 /**
  18  * Magic Auth (remote authentication) module.
  19  *
  20  * Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
  21  */
  22 class Magic extends BaseModule
  23 {
  24         public static function init(array $parameters = [])
  25         {
  26                 $a = DI::app();
  27                 $ret = ['success' => false, 'url' => '', 'message' => ''];
  28                 Logger::log('magic mdule: invoked', Logger::DEBUG);
  29
  30                 Logger::log('args: ' . print_r($_REQUEST, true), Logger::DATA);
  31
  32                 $addr = $_REQUEST['addr'] ?? '';
  33                 $dest = $_REQUEST['dest'] ?? '';
  34                 $test = (!empty($_REQUEST['test']) ? intval($_REQUEST['test']) : 0);
  35                 $owa  = (!empty($_REQUEST['owa'])  ? intval($_REQUEST['owa'])  : 0);
  36                 $cid  = 0;
  37
  38                 if (!empty($addr)) {
  39                         $cid = Contact::getIdForURL($addr);
  40                 } elseif (!empty($dest)) {
  41                         $cid = Contact::getIdForURL($dest);
  42                 }
  43
  44                 if (!$cid) {
  45                         Logger::info('No contact record found', $_REQUEST);
  46                         // @TODO Finding a more elegant possibility to redirect to either internal or external URL
  47                         $a->redirect($dest);
  48                 }
  49                 $contact = DBA::selectFirst('contact', ['id', 'nurl', 'url'], ['id' => $cid]);
  50
  51                 // Redirect if the contact is already authenticated on this site.
  52                 if (!empty($a->contact) && array_key_exists('id', $a->contact) && strpos($contact['nurl'], Strings::normaliseLink(DI::baseUrl()->get())) !== false) {
  53                         if ($test) {
  54                                 $ret['success'] = true;
  55                                 $ret['message'] .= 'Local site - you are already authenticated.' . EOL;
  56                                 return $ret;
  57                         }
  58
  59                         Logger::log('Contact is already authenticated', Logger::DEBUG);
  60                         System::externalRedirect($dest);
  61                 }
  62
  63                 if (local_user()) {
  64                         $user = $a->user;
  65
  66                         // OpenWebAuth
  67                         if ($owa) {
  68                                 // Extract the basepath
  69                                 // NOTE: we need another solution because this does only work
  70                                 // for friendica contacts :-/ . We should have the basepath
  71                                 // of a contact also in the contact table.
  72                                 $exp = explode('/profile/', $contact['url']);
  73                                 $basepath = $exp[0];
  74
  75                                 $headers = [];
  76                                 $headers['Accept'] = 'application/x-dfrn+json, application/x-zot+json';
  77                                 $headers['X-Open-Web-Auth'] = Strings::getRandomHex();
  78
  79                                 // Create a header that is signed with the local users private key.
  80                                 $headers = HTTPSignature::createSig(
  81                                         $headers,
  82                                         $user['prvkey'],
  83                                         'acct:' . $user['nickname'] . '@' . DI::baseUrl()->getHostname() . (DI::baseUrl()->getUrlPath() ? '/' . DI::baseUrl()->getUrlPath() : '')
  84                                 );
  85
  86                                 // Try to get an authentication token from the other instance.
  87                                 $curlResult = Network::curl($basepath . '/owa', false, ['headers' => $headers]);
  88
  89                                 if ($curlResult->isSuccess()) {
  90                                         $j = json_decode($curlResult->getBody(), true);
  91
  92                                         if ($j['success']) {
  93                                                 $token = '';
  94                                                 if ($j['encrypted_token']) {
  95                                                         // The token is encrypted. If the local user is really the one the other instance
  96                                                         // thinks he/she is, the token can be decrypted with the local users public key.
  97                                                         openssl_private_decrypt(Strings::base64UrlDecode($j['encrypted_token']), $token, $user['prvkey']);
  98                                                 } else {
  99                                                         $token = $j['token'];
 100                                                 }
 101                                                 $args = (strpbrk($dest, '?&') ? '&' : '?') . 'owt=' . $token;
 102
 103                                                 Logger::info('Redirecting', ['path' => $dest . $args]);
 104                                                 System::externalRedirect($dest . $args);
 105                                         }
 106                                 }
 107                                 System::externalRedirect($dest);
 108                         }
 109                 }
 110
 111                 if ($test) {
 112                         $ret['message'] = 'Not authenticated or invalid arguments' . EOL;
 113                         return $ret;
 114                 }
 115
 116                 // @TODO Finding a more elegant possibility to redirect to either internal or external URL
 117                 $a->redirect($dest);
 118         }
 119 }