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\Database\dba;
   9 use Friendica\Model\Contact;
  10 use Friendica\Util\HTTPSignature;
  11 use Friendica\Util\Network;
  12
  13 /**
  14  * Magic Auth (remote authentication) module.
  15  *
  16  * Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
  17  */
  18 class Magic extends BaseModule
  19 {
  20         public static function init()
  21         {
  22                 $a = self::getApp();
  23                 $ret = ['success' => false, 'url' => '', 'message' => ''];
  24                 logger('magic mdule: invoked', LOGGER_DEBUG);
  25
  26                 logger('args: ' . print_r($_REQUEST, true), LOGGER_DATA);
  27
  28                 $addr = ((x($_REQUEST, 'addr')) ? $_REQUEST['addr'] : '');
  29                 $dest = ((x($_REQUEST, 'dest')) ? $_REQUEST['dest'] : '');
  30                 $test = ((x($_REQUEST, 'test')) ? intval($_REQUEST['test']) : 0);
  31                 $owa  = ((x($_REQUEST, 'owa'))  ? intval($_REQUEST['owa'])  : 0);
  32
  33                 // NOTE: I guess $dest isn't just the profile url (could be also
  34                 // other profile pages e.g. photo). We need to find a solution
  35                 // to be able to redirct to other pages than the contact profile.
  36                 $cid = Contact::getIdForURL($dest);
  37
  38                 if (!$cid && !empty($addr)) {
  39                         $cid = Contact::getIdForURL($addr);
  40                 }
  41
  42                 if (!$cid) {
  43                         logger('No contact record found: ' . print_r($_REQUEST, true), LOGGER_DEBUG);
  44                         goaway($dest);
  45                 }
  46
  47                 $contact = dba::selectFirst('contact', ['id', 'nurl', 'url'], ['id' => $cid]);
  48
  49                 // Redirect if the contact is already authenticated on this site.
  50                 if (!empty($a->contact) && array_key_exists('id', $a->contact) && strpos($contact['nurl'], normalise_link(self::getApp()->get_baseurl())) !== false) {
  51                         if ($test) {
  52                                 $ret['success'] = true;
  53                                 $ret['message'] .= 'Local site - you are already authenticated.' . EOL;
  54                                 return $ret;
  55                         }
  56
  57                         logger('Contact is already authenticated', LOGGER_DEBUG);
  58                         goaway($dest);
  59                 }
  60
  61                 if (local_user()) {
  62                         $user = $a->user;
  63
  64                         // OpenWebAuth
  65                         if ($owa) {
  66                                 // Extract the basepath
  67                                 // NOTE: we need another solution because this does only work
  68                                 // for friendica contacts :-/ . We should have the basepath
  69                                 // of a contact also in the contact table.
  70                                 $exp = explode('/profile/', $contact['url']);
  71                                 $basepath = $exp[0];
  72
  73                                 $headers = [];
  74                                 $headers['Accept'] = 'application/x-dfrn+json';
  75                                 $headers['X-Open-Web-Auth'] = random_string();
  76
  77                                 // Create a header that is signed with the local users private key.
  78                                 $headers = HTTPSignature::createSig(
  79                                         '',
  80                                         $headers,
  81                                         $user['prvkey'],
  82                                         'acct:' . $user['nickname'] . '@' . $a->get_hostname() . ($a->urlpath ? '/' . $a->urlpath : ''),
  83                                         false,
  84                                         true,
  85                                         'sha512'
  86                                 );
  87
  88                                 // Try to get an authentication token from the other instance.
  89                                 $x = Network::curl($basepath . '/owa', false, $redirects, ['headers' => $headers]);
  90
  91                                 if ($x['success']) {
  92                                         $j = json_decode($x['body'], true);
  93
  94                                         if ($j['success']) {
  95                                                 $token = '';
  96                                                 if ($j['encrypted_token']) {
  97                                                         // The token is encrypted. If the local user is really the one the other instance
  98                                                         // thinks he/she is, the token can be decrypted with the local users public key.
  99                                                         openssl_private_decrypt(base64url_decode($j['encrypted_token']), $token, $user['prvkey']);
 100                                                 } else {
 101                                                         $token = $j['token'];
 102                                                 }
 103                                                 $x = strpbrk($dest, '?&');
 104                                                 $args = (($x) ? '&owt=' . $token : '?f=&owt=' . $token);
 105
 106                                                 goaway($dest . $args);
 107                                         }
 108                                 }
 109                                 goaway($dest);
 110                         }
 111                 }
 112
 113                 if ($test) {
 114                         $ret['message'] = 'Not authenticated or invalid arguments' . EOL;
 115                         return $ret;
 116                 }
 117
 118                 goaway($dest);
 119         }
 120 }