mod/dfrn_poll.php

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