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