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