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\Model\Contact;
   9 use Friendica\Util\HTTPSignature;
  10 use Friendica\Util\Network;
  11
  12 use dba;
  13
  14 /**
  15  * Magic Auth (remote authentication) module.
  16  *
  17  * Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Magic.php
  18  */
  19 class Magic extends BaseModule
  20 {
  21         public static function init()
  22         {
  23                 $a = self::getApp();
  24                 $ret = ['success' => false, 'url' => '', 'message' => ''];
  25                 logger('magic mdule: invoked', LOGGER_DEBUG);
  26
  27                 logger('args: ' . print_r($_REQUEST, true), LOGGER_DATA);
  28
  29                 $addr = ((x($_REQUEST, 'addr')) ? $_REQUEST['addr'] : '');
  30                 $dest = ((x($_REQUEST, 'dest')) ? $_REQUEST['dest'] : '');
  31                 $test = ((x($_REQUEST, 'test')) ? intval($_REQUEST['test']) : 0);
  32                 $owa  = ((x($_REQUEST, 'owa'))  ? intval($_REQUEST['owa'])  : 0);
  33
  34                 // NOTE: I guess $dest isn't just the profile url (could be also
  35                 // other profile pages e.g. photo). We need to find a solution
  36                 // to be able to redirct to other pages than the contact profile.
  37                 $cid = Contact::getIdForURL($dest);
  38
  39                 if (!$cid && !empty($addr)) {
  40                         $cid = Contact::getIdForURL($addr);
  41                 }
  42
  43                 if (!$cid) {
  44                         logger('No contact record found: ' . print_r($_REQUEST, true), LOGGER_DEBUG);
  45                         goaway($dest);
  46                 }
  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'], normalise_link(self::getApp()->get_baseurl())) !== false) {
  52                         if ($test) {
  53                                 $ret['success'] = true;
  54                                 $ret['message'] .= 'Local site - you are already authenticated.' . EOL;
  55                                 return $ret;
  56                         }
  57
  58                         logger('Contact is already authenticated', LOGGER_DEBUG);
  59                         goaway($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';
  76                                 $headers['X-Open-Web-Auth'] = random_string();
  77
  78                                 // Create a header that is signed with the local users private key.
  79                                 $headers = HTTPSignature::createSig(
  80                                         '',
  81                                         $headers,
  82                                         $user['prvkey'],
  83                                         'acct:' . $user['nickname'] . '@' . $a->get_hostname() . ($a->urlpath ? '/' . $a->urlpath : ''),
  84                                         false,
  85                                         true,
  86                                         'sha512'
  87                                 );
  88
  89                                 // Try to get an authentication token from the other instance.
  90                                 $x = Network::curl($basepath . '/owa', false, $redirects, ['headers' => $headers]);
  91
  92                                 if ($x['success']) {
  93                                         $j = json_decode($x['body'], true);
  94
  95                                         if ($j['success']) {
  96                                                 $token = '';
  97                                                 if ($j['encrypted_token']) {
  98                                                         // The token is encrypted. If the local user is really the one the other instance
  99                                                         // thinks he/she is, the token can be decrypted with the local users public key.
 100                                                         openssl_private_decrypt(base64url_decode($j['encrypted_token']), $token, $user['prvkey']);
 101                                                 } else {
 102                                                         $token = $j['token'];
 103                                                 }
 104                                                 $x = strpbrk($dest, '?&');
 105                                                 $args = (($x) ? '&owt=' . $token : '?f=&owt=' . $token);
 106
 107                                                 goaway($dest . $args);
 108                                         }
 109                                 }
 110                                 goaway($dest);
 111                         }
 112                 }
 113
 114                 if ($test) {
 115                         $ret['message'] = 'Not authenticated or invalid arguments' . EOL;
 116                         return $ret;
 117                 }
 118
 119                 goaway($dest);
 120         }
 121 }