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         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
  20
  21         $direction = (-1);
  22
  23
  24         if(strpos($dfrn_id,':') == 1) {
  25                 $direction = intval(substr($dfrn_id,0,1));
  26                 $dfrn_id   = substr($dfrn_id,2);
  27         }
  28
  29         if(($dfrn_id === '') && (! x($_POST,'dfrn_id')) && ($a->argc > 1)) {
  30                 logger('dfrn_poll: public feed request from ' . $_SERVER['REMOTE_ADDR'] );
  31                 header("Content-type: application/atom+xml");
  32                 $o = get_feed_for($a, '', $a->argv[1],$last_update);
  33                 echo $o;
  34                 killme();
  35         }
  36
  37         if(($type === 'profile') && (! strlen($sec))) {
  38
  39                 $sql_extra = '';
  40                 switch($direction) {
  41                         case (-1):
  42                                 $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
  43                                 $my_id = $dfrn_id;
  44                                 break;
  45                         case 0:
  46                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  47                                 $my_id = '1:' . $dfrn_id;
  48                                 break;
  49                         case 1:
  50                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
  51                                 $my_id = '0:' . $dfrn_id;
  52                                 break;
  53                         default:
  54                                 goaway($a->get_baseurl());
  55                                 break; // NOTREACHED
  56                 }
  57
  58                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
  59                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
  60                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
  61                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
  62                         dbesc($a->argv[1])
  63                 );
  64
  65                 if(count($r)) {
  66
  67                         $s = fetch_url($r[0]['poll'] . '?dfrn_id=' . $my_id . '&type=profile-check');
  68
  69                         logger("dfrn_poll: old profile returns " . $s, LOGGER_DATA);
  70
  71                         if(strlen($s)) {
  72
  73                                 $xml = parse_xml_string($s);
  74
  75                                 if((int) $xml->status == 1) {
  76                                         $_SESSION['authenticated'] = 1;
  77                                         $_SESSION['visitor_id'] = $r[0]['id'];
  78                                         $_SESSION['visitor_home'] = $r[0]['url'];
  79                                         notice( sprintf(t('%s welcomes %s'), $r[0]['username'] , $r[0]['name']) . EOL);
  80                                         // Visitors get 1 day session.
  81                                         $session_id = session_id();
  82                                         $expire = time() + 86400;
  83                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s' LIMIT 1",
  84                                                 dbesc($expire),
  85                                                 dbesc($session_id)
  86                                         );
  87                                 }
  88                         }
  89                         $profile = $r[0]['nickname'];
  90                         goaway((strlen($destination_url)) ? $destination_url : $a->get_baseurl() . '/profile/' . $profile);
  91                 }
  92                 goaway($a->get_baseurl());
  93
  94         }
  95
  96         if($type === 'profile-check' && $dfrn_version < 2.2 ) {
  97
  98                 if((strlen($challenge)) && (strlen($sec))) {
  99
 100                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 101                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 102                                 dbesc($sec)
 103                         );
 104                         if(! count($r)) {
 105                                 xml_status(3, 'No ticket');
 106                                 // NOTREACHED
 107                         }
 108                         $orig_id = $r[0]['dfrn_id'];
 109                         if(strpos($orig_id, ':'))
 110                                 $orig_id = substr($orig_id,2);
 111
 112                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 113                                 intval($r[0]['cid'])
 114                         );
 115                         if(! count($c)) {
 116                                 xml_status(3, 'No profile');
 117                         }
 118                         $contact = $c[0];
 119
 120                         $sent_dfrn_id = hex2bin($dfrn_id);
 121                         $challenge    = hex2bin($challenge);
 122
 123                         $final_dfrn_id = '';
 124
 125                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 126                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 127                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 128                         }
 129                         else {
 130                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 131                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 132                         }
 133
 134                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 135
 136                         if(strpos($final_dfrn_id,':') == 1)
 137                                 $final_dfrn_id = substr($final_dfrn_id,2);
 138
 139                         if($final_dfrn_id != $orig_id) {
 140                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 141                                 // did not decode properly - cannot trust this site
 142                                 xml_status(3, 'Bad decryption');
 143                         }
 144
 145                         header("Content-type: text/xml");
 146                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 147                         killme();
 148                         // NOTREACHED
 149                 }
 150                 else {
 151                                 // old protocol
 152
 153                         switch($direction) {
 154                                 case 1:
 155                                         $dfrn_id = '0:' . $dfrn_id;
 156                                         break;
 157                                 case 0:
 158                                         $dfrn_id = '1:' . $dfrn_id;
 159                                         break;
 160                                 default:
 161                                         break;
 162                         }
 163
 164
 165                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 166                         $r = q("SELECT * FROM `profile_check` WHERE `dfrn_id` = '%s' ORDER BY `expire` DESC",
 167                                 dbesc($dfrn_id));
 168                         if(count($r)) {
 169                                 xml_status(1);
 170                                 return; // NOTREACHED
 171                         }
 172                         xml_status(0);
 173                         return; // NOTREACHED
 174                 }
 175         }
 176
 177 }
 178
 179
 180
 181 function dfrn_poll_post(&$a) {
 182
 183         $dfrn_id      = ((x($_POST,'dfrn_id'))      ? $_POST['dfrn_id']              : '');
 184         $challenge    = ((x($_POST,'challenge'))    ? $_POST['challenge']            : '');
 185         $url          = ((x($_POST,'url'))          ? $_POST['url']                  : '');
 186         $sec          = ((x($_POST,'sec'))          ? $_POST['sec']                  : '');
 187         $ptype        = ((x($_POST,'type'))         ? $_POST['type']                 : '');
 188         $dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 189         $perm         = ((x($_POST,'perm'))         ? $_POST['perm']                 : 'r');
 190
 191         if($ptype === 'profile-check') {
 192
 193                 if((strlen($challenge)) && (strlen($sec))) {
 194
 195                         logger('dfrn_poll: POST: profile-check');
 196
 197                         q("DELETE FROM `profile_check` WHERE `expire` < " . intval(time()));
 198                         $r = q("SELECT * FROM `profile_check` WHERE `sec` = '%s' ORDER BY `expire` DESC LIMIT 1",
 199                                 dbesc($sec)
 200                         );
 201                         if(! count($r)) {
 202                                 xml_status(3, 'No ticket');
 203                                 // NOTREACHED
 204                         }
 205                         $orig_id = $r[0]['dfrn_id'];
 206                         if(strpos($orig_id, ':'))
 207                                 $orig_id = substr($orig_id,2);
 208
 209                         $c = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
 210                                 intval($r[0]['cid'])
 211                         );
 212                         if(! count($c)) {
 213                                 xml_status(3, 'No profile');
 214                         }
 215                         $contact = $c[0];
 216
 217                         $sent_dfrn_id = hex2bin($dfrn_id);
 218                         $challenge    = hex2bin($challenge);
 219
 220                         $final_dfrn_id = '';
 221
 222                         if(($contact['duplex']) && strlen($contact['prvkey'])) {
 223                                 openssl_private_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['prvkey']);
 224                                 openssl_private_decrypt($challenge,$decoded_challenge,$contact['prvkey']);
 225                         }
 226                         else {
 227                                 openssl_public_decrypt($sent_dfrn_id,$final_dfrn_id,$contact['pubkey']);
 228                                 openssl_public_decrypt($challenge,$decoded_challenge,$contact['pubkey']);
 229                         }
 230
 231                         $final_dfrn_id = substr($final_dfrn_id, 0, strpos($final_dfrn_id, '.'));
 232
 233                         if(strpos($final_dfrn_id,':') == 1)
 234                                 $final_dfrn_id = substr($final_dfrn_id,2);
 235
 236                         if($final_dfrn_id != $orig_id) {
 237                                 logger('profile_check: ' . $final_dfrn_id . ' != ' . $orig_id, LOGGER_DEBUG);
 238                                 // did not decode properly - cannot trust this site
 239                                 xml_status(3, 'Bad decryption');
 240                         }
 241
 242                         header("Content-type: text/xml");
 243                         echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?><dfrn_poll><status>0</status><challenge>$decoded_challenge</challenge><sec>$sec</sec></dfrn_poll>";
 244                         killme();
 245                         // NOTREACHED
 246                 }
 247
 248         }
 249
 250         $direction    = (-1);
 251         if(strpos($dfrn_id,':') == 1) {
 252                 $direction = intval(substr($dfrn_id,0,1));
 253                 $dfrn_id   = substr($dfrn_id,2);
 254         }
 255
 256
 257         $r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 258                 dbesc($dfrn_id),
 259                 dbesc($challenge)
 260         );
 261
 262         if(! count($r))
 263                 killme();
 264
 265         $type = $r[0]['type'];
 266         $last_update = $r[0]['last_update'];
 267
 268         $r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
 269                 dbesc($dfrn_id),
 270                 dbesc($challenge)
 271         );
 272
 273
 274         $sql_extra = '';
 275         switch($direction) {
 276                 case (-1):
 277                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 278                         $my_id = $dfrn_id;
 279                         break;
 280                 case 0:
 281                         $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 282                         $my_id = '1:' . $dfrn_id;
 283                         break;
 284                 case 1:
 285                         $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 286                         $my_id = '0:' . $dfrn_id;
 287                         break;
 288                 default:
 289                         goaway($a->get_baseurl());
 290                         break; // NOTREACHED
 291         }
 292
 293
 294         $r = q("SELECT * FROM `contact` WHERE `blocked` = 0 AND `pending` = 0 $sql_extra LIMIT 1");
 295
 296
 297         if(! count($r))
 298                 killme();
 299
 300         $contact = $r[0];
 301         $owner_uid = $r[0]['uid'];
 302         $contact_id = $r[0]['id'];
 303
 304
 305         if($type === 'reputation' && strlen($url)) {
 306                 $r = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 307                         dbesc($url),
 308                         intval($owner_uid)
 309                 );
 310                 $reputation = 0;
 311                 $text = '';
 312
 313                 if(count($r)) {
 314                         $reputation = $r[0]['rating'];
 315                         $text = $r[0]['reason'];
 316
 317                         if($r[0]['id'] == $contact_id) {        // inquiring about own reputation not allowed
 318                                 $reputation = 0;
 319                                 $text = '';
 320                         }
 321                 }
 322
 323                 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
 324                 <reputation>
 325                         <url>$url</url>
 326                         <rating>$reputation</rating>
 327                         <description>$text</description>
 328                 </reputation>
 329                 ";
 330                 killme();
 331                 // NOTREACHED
 332         }
 333         else {
 334
 335                 // Update the writable flag if it changed
 336                 logger('dfrn_poll: post request feed: ' . print_r($_POST,true),LOGGER_DATA);
 337                 if($dfrn_version >= 2.21) {
 338                         if($perm === 'rw')
 339                                 $writable = 1;
 340                         else
 341                                 $writable = 0;
 342
 343                         if($writable !=  $contact['writable']) {
 344                                 q("UPDATE `contact` SET `writable` = %d WHERE `id` = %d LIMIT 1",
 345                                         intval($writable),
 346                                         intval($contact_id)
 347                                 );
 348                         }
 349                 }
 350
 351                 header("Content-type: application/atom+xml");
 352                 $o = get_feed_for($a,$dfrn_id, $a->argv[1], $last_update, $direction);
 353                 echo $o;
 354                 killme();
 355
 356         }
 357 }
 358
 359 function dfrn_poll_content(&$a) {
 360
 361         $dfrn_id         = ((x($_GET,'dfrn_id'))         ? $_GET['dfrn_id']              : '');
 362         $type            = ((x($_GET,'type'))            ? $_GET['type']                 : 'data');
 363         $last_update     = ((x($_GET,'last_update'))     ? $_GET['last_update']          : '');
 364         $destination_url = ((x($_GET,'destination_url')) ? $_GET['destination_url']      : '');
 365         $sec             = ((x($_GET,'sec'))             ? $_GET['sec']                  : '');
 366         $dfrn_version    = ((x($_GET,'dfrn_version'))    ? (float) $_GET['dfrn_version'] : 2.0);
 367         $perm            = ((x($_GET,'perm'))            ? $_GET['perm']                 : 'r');
 368
 369         $direction = (-1);
 370         if(strpos($dfrn_id,':') == 1) {
 371                 $direction = intval(substr($dfrn_id,0,1));
 372                 $dfrn_id = substr($dfrn_id,2);
 373         }
 374
 375
 376         if($dfrn_id != '') {
 377                 // initial communication from external contact
 378                 $hash = random_string();
 379
 380                 $status = 0;
 381
 382                 $r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
 383
 384                 if($type !== 'profile') {
 385                         $r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
 386                                 VALUES( '%s', '%s', '%s', '%s', '%s' ) ",
 387                                 dbesc($hash),
 388                                 dbesc($dfrn_id),
 389                                 intval(time() + 60 ),
 390                                 dbesc($type),
 391                                 dbesc($last_update)
 392                         );
 393                 }
 394                 $sql_extra = '';
 395                 switch($direction) {
 396                         case (-1):
 397                                 if($type === 'profile')
 398                                         $sql_extra = sprintf(" AND ( `dfrn-id` = '%s' OR `issued-id` = '%s' ) ", dbesc($dfrn_id),dbesc($dfrn_id));
 399                                 else
 400                                         $sql_extra = sprintf(" AND `issued-id` = '%s' ", dbesc($dfrn_id));
 401                                 $my_id = $dfrn_id;
 402                                 break;
 403                         case 0:
 404                                 $sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 405                                 $my_id = '1:' . $dfrn_id;
 406                                 break;
 407                         case 1:
 408                                 $sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
 409                                 $my_id = '0:' . $dfrn_id;
 410                                 break;
 411                         default:
 412                                 goaway($a->get_baseurl());
 413                                 break; // NOTREACHED
 414                 }
 415
 416                 $r = q("SELECT `contact`.*, `user`.`username`, `user`.`nickname`
 417                         FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 418                         WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
 419                         AND `user`.`nickname` = '%s' $sql_extra LIMIT 1",
 420                         dbesc($a->argv[1])
 421                 );
 422
 423                 if(count($r)) {
 424
 425                         $challenge = '';
 426                         $encrypted_id = '';
 427                         $id_str = $my_id . '.' . mt_rand(1000,9999);
 428
 429                         if($r[0]['duplex'] && strlen($r[0]['pubkey'])) {
 430                                 openssl_public_encrypt($hash,$challenge,$r[0]['pubkey']);
 431                                 openssl_public_encrypt($id_str,$encrypted_id,$r[0]['pubkey']);
 432                         }
 433                         else {
 434                                 openssl_private_encrypt($hash,$challenge,$r[0]['prvkey']);
 435                                 openssl_private_encrypt($id_str,$encrypted_id,$r[0]['prvkey']);
 436                         }
 437
 438                         $challenge = bin2hex($challenge);
 439                         $encrypted_id = bin2hex($encrypted_id);
 440                 }
 441                 else {
 442                         $status = 1;
 443                         $challenge = '';
 444                         $encrypted_id = '';
 445                 }
 446
 447                 if(($type === 'profile') && (strlen($sec))) {
 448
 449                         // URL reply
 450
 451                         if($dfrn_version < 2.2) {
 452                                 $s = fetch_url($r[0]['poll']
 453                                         . '?dfrn_id=' . $encrypted_id
 454                                         . '&type=profile-check'
 455                                         . '&dfrn_version=' . DFRN_PROTOCOL_VERSION
 456                                         . '&challenge=' . $challenge
 457                                         . '&sec=' . $sec
 458                                 );
 459                         }
 460                         else {
 461                                 $s = post_url($r[0]['poll'], array(
 462                                         'dfrn_id' => $encrypted_id,
 463                                         'type' => 'profile-check',
 464                                         'dfrn_version' => DFRN_PROTOCOL_VERSION,
 465                                         'challenge' => $challenge,
 466                                         'sec' => $sec
 467                                 ));
 468                         }
 469
 470                         $profile = $r[0]['nickname'];
 471
 472                         switch($destination_url) {
 473                                 case 'profile':
 474                                         $dest = $a->get_baseurl() . '/profile/' . $profile . '?tab=profile';
 475                                         break;
 476                                 case 'photos':
 477                                         $dest = $a->get_baseurl() . '/photos/' . $profile;
 478                                         break;
 479                                 case 'status':
 480                                 case '':
 481                                         $dest = $a->get_baseurl() . '/profile/' . $profile;
 482                                         break;
 483                                 default:
 484                                         $dest = $destination_url;
 485                                         break;
 486                         }
 487
 488                         logger("dfrn_poll: sec profile: " . $s, LOGGER_DATA);
 489
 490                         if(strlen($s) && strstr($s,'<?xml')) {
 491
 492                                 $xml = parse_xml_string($s);
 493
 494                                 logger('dfrn_poll: profile: parsed xml: ' . print_r($xml,true), LOGGER_DATA);
 495
 496                                 logger('dfrn_poll: secure profile: challenge: ' . $xml->challenge . ' expecting ' . $hash);
 497                                 logger('dfrn_poll: secure profile: sec: ' . $xml->sec . ' expecting ' . $sec);
 498
 499
 500                                 if(((int) $xml->status == 0) && ($xml->challenge == $hash)  && ($xml->sec == $sec)) {
 501                                         $_SESSION['authenticated'] = 1;
 502                                         $_SESSION['visitor_id'] = $r[0]['id'];
 503                                         $_SESSION['visitor_home'] = $r[0]['url'];
 504                                         notice( sprintf(t('%s welcomes %s'), $r[0]['username'] , $r[0]['name']) . EOL);
 505                                         // Visitors get 1 day session.
 506                                         $session_id = session_id();
 507                                         $expire = time() + 86400;
 508                                         q("UPDATE `session` SET `expire` = '%s' WHERE `sid` = '%s' LIMIT 1",
 509                                                 dbesc($expire),
 510                                                 dbesc($session_id)
 511                                         );
 512                                 }
 513
 514                                 goaway($dest);
 515                         }
 516                         goaway($dest);
 517                         // NOTREACHED
 518
 519                 }
 520                 else {
 521                         // XML reply
 522                         header("Content-type: text/xml");
 523                         echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
 524                                 . '<dfrn_poll>' . "\r\n"
 525                                 . "\t" . '<status>' . $status . '</status>' . "\r\n"
 526                                 . "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
 527                                 . "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
 528                                 . "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
 529                                 . '</dfrn_poll>' . "\r\n" ;
 530                         killme();
 531                         // NOTREACHED
 532                 }
 533         }
 534 }
 535
 536