mod/dfrn_poll.php

   1 <?php
   2
   3
   4
   5 require_once('include/items.php');
   6 require_once('include/auth.php');
   7
   8
   9 function dfrn_poll_init(&$a) {
  10
  11
  12         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
  13         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
  14         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
  15         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
  16         $challenge       = ((x($_GET,'challenge'))       ? $_GET['challenge']            : '');
  17         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
  18         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
  19
  20         $direction = (-1);
  21
  22
  23         if(strpos($dfrn_id,':') == 1) {
  24                 $direction = intval(substr($dfrn_id,0,1));
  25                 $dfrn_id   = substr($dfrn_id,2);
  26         }
  27
  28         if(($dfrn_id === '') && (! x($_POST,'dfrn_id')) && ($a->argc > 1)) {
  29                 header("Content-type: application/atom+xml");
  30                 $o = get_feed_for($a, '*', $a->argv[1],$last_update);
  31                 echo $o;
  32                 killme();
  33         }
  34
  35         if(($type === 'profile') && (! strlen($sec))) {
  36
  37                 $sql_extra = '';
  38                 switch($direction) {
  39                         case (-1):
  40                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  41                                 $my_id = $dfrn_id;
  42                                 break;
  43                         case 0:
  44                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  45                                 $my_id = '1:' . $dfrn_id;
  46                                 break;
  47                         case 1:
  48                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  49                                 $my_id = '0:' . $dfrn_id;
  50                                 break;
  51                         default:
  52                                 goaway($a->get_baseurl());
  53                                 break; // NOTREACHED
  54                 }
  55
  56                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  57                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  58                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  59                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  60                         dbesc($a->argv[1])
  61                 );
  62
  63                 if(count($r)) {
  64
  65                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  66
  67                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
  68
  69                         if(strlen($s)) {
  70
  71                                 $xml = simplexml_load_string($s);
  72
  73                                 if((int) $xml->status == 1) {
  74                                         $_SESSION['authenticated'] = 1;
  75                                         $_SESSION['visitor_id'] = $r[0]['id'];
  76                                         notice( $r[0]['username'] . t(' welcomes ') . $r[0]['name'] . EOL);
  77                                         // Visitors get 1 day session.
  78                                         $session_id = session_id();
  79                                         $expire = time() + 86400;
  80                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s' LIMIT 1",
  81                                                 dbesc($expire),
  82                                                 dbesc($session_id)
  83                                         );
  84                                 }
  85                         }
  86                         $profile = $r[0]['nickname'];
  87                         goaway((strlen($destination_url)) ? $destination_url : $a->get_baseurl() . '/profile/' . $profile);
  88                 }
  89                 goaway($a->get_baseurl());
  90
  91         }
  92
  93         if($type === 'profile-check') {
  94
  95                 if((strlen($challenge)) && (strlen($sec))) {
  96
  97                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
  98                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
  99                                 dbesc($sec)
 100                         );
 101                         if(! count($r)) {
 102                                 xml_status(3);
 103                                 // NOTREACHED
 104                         }
 105                         $orig_id = $r[0]['dfrn_id'];
 106                         if(strpos(':',$orig_id))
 107                                 $orig_id = substr($orig_id,2);
 108
 109                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 110                                 intval($r[0]['cid'])
 111                         );
 112                         if(! count($c)) {
 113                                 xml_status(3);
 114                         }
 115                         $contact = $c[0];
 116
 117                         $sent_dfrn_id = hex2bin($dfrn_id);
 118                         $challenge    = hex2bin($challenge);
 119
 120                         $final_dfrn_id = '';
 121
 122                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 123                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 124                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 125                         }
 126                         else {
 127                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 128                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 129                         }
 130
 131                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 132
 133                         if(strpos($final_dfrn_id,':') == 1)
 134                                 $final_dfrn_id = substr($final_dfrn_id,2);
 135
 136                         if($final_dfrn_id != $orig_id) {
 137
 138                                 // did not decode properly - cannot trust this site
 139                                 xml_status(3);
 140                         }
 141
 142                         header("Content-type: text/xml");
 143                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 144                         killme();
 145                         // NOTREACHED
 146                 }
 147                 else {
 148                                 // old protocol
 149
 150                         switch($direction) {
 151                                 case 1:
 152                                         $dfrn_id = '0:' . $dfrn_id;
 153                                         break;
 154                                 case 0:
 155                                         $dfrn_id = '1:' . $dfrn_id;
 156                                         break;
 157                                 default:
 158                                         break;
 159                         }
 160
 161
 162                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 163                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 164                                 dbesc($dfrn_id));
 165                         if(count($r)) {
 166                                 xml_status(1);
 167                                 return; // NOTREACHED
 168                         }
 169                         xml_status(0);
 170                         return; // NOTREACHED
 171                 }
 172         }
 173
 174 }
 175
 176
 177
 178 function dfrn_poll_post(&$a) {
 179
 180         $dfrn_id      = ((x($_POST,'dfrn_id'))      ? $_POST['dfrn_id']              : '');
 181         $challenge    = ((x($_POST,'challenge'))    ? $_POST['challenge']            : '');
 182         $url          = ((x($_POST,'url'))          ? $_POST['url']                  : '');
 183         $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 184
 185         $direction    = (-1);
 186         if(strpos($dfrn_id,':') == 1) {
 187                 $direction = intval(substr($dfrn_id,0,1));
 188                 $dfrn_id   = substr($dfrn_id,2);
 189         }
 190
 191
 192         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 193                 dbesc($dfrn_id),
 194                 dbesc($challenge)
 195         );
 196
 197         if(! count($r))
 198                 killme();
 199
 200         $type = $r[0]['type'];
 201         $last_update = $r[0]['last_update'];
 202
 203         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 204                 dbesc($dfrn_id),
 205                 dbesc($challenge)
 206         );
 207
 208
 209         $sql_extra = '';
 210         switch($direction) {
 211                 case (-1):
 212                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 213                         $my_id = $dfrn_id;
 214                         break;
 215                 case 0:
 216                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 217                         $my_id = '1:' . $dfrn_id;
 218                         break;
 219                 case 1:
 220                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 221                         $my_id = '0:' . $dfrn_id;
 222                         break;
 223                 default:
 224                         goaway($a->get_baseurl());
 225                         break; // NOTREACHED
 226         }
 227
 228
 229         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 230
 231
 232         if(! count($r))
 233                 killme();
 234
 235         $owner_uid = $r[0]['uid'];
 236         $contact_id = $r[0]['id'];
 237
 238
 239         if($type === 'reputation' && strlen($url)) {
 240                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 241                         dbesc($url),
 242                         intval($owner_uid)
 243                 );
 244                 $reputation = 0;
 245                 $text = '';
 246
 247                 if(count($r)) {
 248                         $reputation = $r[0]['rating'];
 249                         $text = $r[0]['reason'];
 250
 251                         if($r[0]['id'] == $contact_id) {        // inquiring about own reputation not allowed
 252                                 $reputation = 0;
 253                                 $text = '';
 254                         }
 255                 }
 256
 257                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 258                 <reputation>
 259                         <url>$url</url>
 260                         <rating>$reputation</rating>
 261                         <description>$text</description>
 262                 </reputation>
 263                 ";
 264                 killme();
 265                 // NOTREACHED
 266         }
 267         else {
 268                 header("Content-type: application/atom+xml");
 269                 $o = get_feed_for($a,$dfrn_id, $a->argv[1], $last_update, $direction);
 270                 echo $o;
 271                 killme();
 272
 273         }
 274 }
 275
 276 function dfrn_poll_content(&$a) {
 277
 278         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 279         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 280         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 281         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 282         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 283         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 284
 285         $direction = (-1);
 286         if(strpos($dfrn_id,':') == 1) {
 287                 $direction = intval(substr($dfrn_id,0,1));
 288                 $dfrn_id = substr($dfrn_id,2);
 289         }
 290
 291
 292         if($dfrn_id != '') {
 293                 // initial communication from external contact
 294                 $hash = random_string();
 295
 296                 $status = 0;
 297
 298                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 299
 300                 if($type !== 'profile') {
 301                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 302                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 303                                 dbesc($hash),
 304                                 dbesc($dfrn_id),
 305                                 intval(time() + 60 ),
 306                                 dbesc($type),
 307                                 dbesc($last_update)
 308                         );
 309                 }
 310                 $sql_extra = '';
 311                 switch($direction) {
 312                         case (-1):
 313                                 if($type === 'profile')
 314                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 315                                 else
 316                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 317                                 $my_id = $dfrn_id;
 318                                 break;
 319                         case 0:
 320                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 321                                 $my_id = '1:' . $dfrn_id;
 322                                 break;
 323                         case 1:
 324                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 325                                 $my_id = '0:' . $dfrn_id;
 326                                 break;
 327                         default:
 328                                 goaway($a->get_baseurl());
 329                                 break; // NOTREACHED
 330                 }
 331
 332                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 333                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 334                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 335                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 336                         dbesc($a->argv[1])
 337                 );
 338
 339                 if(count($r)) {
 340
 341                         $challenge = '';
 342                         $encrypted_id = '';
 343                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 344
 345                         if($r[0]['duplex'] && strlen($r[0]['pubkey'])) {
 346                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 347                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 348                         }
 349                         else {
 350                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 351                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 352                         }
 353
 354                         $challenge = bin2hex($challenge);
 355                         $encrypted_id = bin2hex($encrypted_id);
 356                 }
 357                 else {
 358                         $status = 1;
 359                         $challenge = '';
 360                         $encrypted_id = '';
 361                 }
 362
 363                 if(($type === 'profile') && (strlen($sec))) {
 364                         // URL reply
 365
 366                         $s = fetch_url($r[0]['poll']
 367                                 . '?dfrn_id=' . $encrypted_id
 368                                 . '&type=profile-check'
 369                                 . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 370                                 . '&challenge=' . $challenge
 371                                 . '&sec=' . $sec
 372                         );
 373
 374                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 375
 376                         if(strlen($s) && strstr($s,'<?xml')) {
 377
 378                                 $xml = simplexml_load_string($s);
 379
 380                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 381
 382                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 383                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 384
 385
 386                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 387                                         $_SESSION['authenticated'] = 1;
 388                                         $_SESSION['visitor_id'] = $r[0]['id'];
 389                                         notice( $r[0]['username'] . t(' welcomes ') . $r[0]['name'] . EOL);
 390                                         // Visitors get 1 day session.
 391                                         $session_id = session_id();
 392                                         $expire = time() + 86400;
 393                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s' LIMIT 1",
 394                                                 dbesc($expire),
 395                                                 dbesc($session_id)
 396                                         );
 397                                 }
 398                                 $profile = $r[0]['nickname'];
 399                                 goaway((strlen($destination_url)) ? $destination_url : $a->get_baseurl() . '/profile/' . $profile);
 400                         }
 401                         goaway($a->get_baseurl());
 402                         // NOTREACHED
 403
 404                 }
 405                 else {
 406                         // XML reply
 407                         header("Content-type: text/xml");
 408                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 409                                 . '<dfrn_poll>' . "\r\n"
 410                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 411                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 412                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 413                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 414                                 . '</dfrn_poll>' . "\r\n" ;
 415                         killme();
 416                         // NOTREACHED
 417                 }
 418         }
 419 }
 420
 421