mod/dfrn_confirm.php

   1 <?php
   2
   3 // There are two possible entry points.
   4
   5
   6 function dfrn_confirm_post(&$a,$handsfree = null) {
   7
   8         if(is_array($handsfree)) {
   9
  10                 // called directly from dfrn_request due to automatic friend acceptance
  11                 // any $_POST parameters we may require are supplied in the $handsfree array
  12
  13                 $node = $handsfree['node'];
  14                 $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
  15
  16         }
  17         else {
  18                 if($a->argc > 1)
  19                         $node = $a->argv[1];
  20         }
  21
  22                 // Main entry point. Our user received a friend request notification (perhaps
  23                 // from another site) and clicked 'Approve'. $POST['source_url'] is not set.
  24                 // OR we have been called directly from dfrn_request ($handsfree != null) due to
  25                 // this being a page type which supports automatic friend acceptance.
  26
  27         if(! x($_POST,'source_url')) {
  28
  29                 $uid = ((is_array($handsfree)) ? $handsfree['uid'] : local_user());
  30
  31                 if(! $uid) {
  32                         notice( t('Permission denied.') . EOL );
  33                         return;
  34                 }
  35
  36                 $user = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
  37                         intval($uid)
  38                 );
  39
  40                 if(! $user) {
  41                         notice( t('Profile not found.') . EOL );
  42                         return;
  43                 }
  44
  45
  46                 // These come from either the friend request notification form or $handsfree array.
  47
  48                 if(is_array($handsfree)) {
  49                         $dfrn_id = $handsfree['dfrn_id'];
  50                         $intro_id = $handsfree['intro_id'];
  51                         $duplex = $handsfree['duplex'];
  52                 }
  53                 else {
  54                         $dfrn_id  = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : "");
  55                         $intro_id = intval($_POST['intro_id']);
  56                         $duplex   = intval($_POST['duplex']);
  57                         $cid      = intval($_POST['contact_id']);
  58                 }
  59
  60                 logger('dfrn_confirm: Confirming request for dfrn_id ' . $dfrn_id);
  61
  62                 // The other person will have been issued an ID when they first requested friendship.
  63                 // Locate their record. At this time, their record will have both pending and blocked set to 1.
  64                 // There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
  65
  66                 $r = q("SELECT * FROM `contact` WHERE ( ( `issued-id` != '' AND `issued-id` = '%s' ) OR ( `id` = %d AND `id` != 0 ) ) AND `uid` = %d LIMIT 1",
  67                                 dbesc($dfrn_id),
  68                                 intval($cid),
  69                                 intval($uid)
  70                 );
  71
  72                 if(! count($r)) {
  73                         notice( t('Contact not found.') . EOL );
  74                         return;
  75                 }
  76
  77                 $contact = $r[0];
  78
  79                 $contact_id   = $contact['id'];
  80                 $relation     = $contact['rel'];
  81                 $site_pubkey  = $contact['site-pubkey'];
  82                 $dfrn_confirm = $contact['confirm'];
  83                 $aes_allow    = $contact['aes_allow'];
  84
  85                 $network = ((strlen($contact['issued-id'])) ? 'dfrn' : 'stat');
  86
  87                 if($network === 'dfrn') {
  88
  89                         // Generate a key pair for all further communications with this person.
  90                         // We have a keypair for every contact, and a site key for unknown people.
  91                         // This provides a means to carry on relationships with other people if
  92                         // any single key is compromised. It is a robust key. We're much more
  93                         // worried about key leakage than anybody cracking it.
  94
  95                         $res = openssl_pkey_new(array(
  96                                 'digest_alg' => 'whirlpool',
  97                                 'private_key_bits' => 4096,
  98                                 'encrypt_key' => false )
  99                         );
 100
 101
 102                         $private_key = '';
 103
 104                         openssl_pkey_export($res, $private_key);
 105
 106                         $pubkey = openssl_pkey_get_details($res);
 107                         $public_key = $pubkey["key"];
 108
 109                         // Save the private key. Send them the public key.
 110
 111                         $r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
 112                                 dbesc($private_key),
 113                                 intval($contact_id),
 114                                 intval($uid)
 115                         );
 116
 117                         $params = array();
 118
 119                         // Per the protocol document, we will verify both ends by encrypting the dfrn_id with our
 120                         // site private key (person on the other end can decrypt it with our site public key).
 121                         // Then encrypt our profile URL with the other person's site public key. They can decrypt
 122                         // it with their site private key. If the decryption on the other end fails for either
 123                         // item, it indicates tampering or key failure on at least one site and we will not be
 124                         // able to provide a secure communication pathway.
 125
 126                         // If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
 127                         // or later) then we encrypt the personal public key we send them using AES-256-CBC and a
 128                         // random key which is encrypted with their site public key.
 129
 130                         $src_aes_key = random_string();
 131
 132                         $result = '';
 133                         openssl_private_encrypt($dfrn_id,$result,$user[0]['prvkey']);
 134
 135                         $params['dfrn_id'] = bin2hex($result);
 136                         $params['public_key'] = $public_key;
 137
 138
 139                         $my_url = $a->get_baseurl() . '/profile/' . $user[0]['nickname'];
 140
 141                         openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
 142                         $params['source_url'] = bin2hex($params['source_url']);
 143
 144                         if($aes_allow && function_exists('openssl_encrypt')) {
 145                                 openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
 146                                 $params['aes_key'] = bin2hex($params['aes_key']);
 147                                 $params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
 148                         }
 149
 150                         $params['dfrn_version'] = DFRN_PROTOCOL_VERSION ;
 151                         if($duplex == 1)
 152                                 $params['duplex'] = 1;
 153
 154                         logger('dfrn_confirm: Confirm: posted data: ' . print_r($params,true), LOGGER_DATA);
 155
 156                         // POST all this stuff to the other site.
 157
 158                         $res = post_url($dfrn_confirm,$params);
 159
 160                         logger('dfrn_confirm: Confirm: received data: ' . $res, LOGGER_DATA);
 161
 162                         // Now figure out what they responded. Try to be robust if the remote site is
 163                         // having difficulty and throwing up errors of some kind.
 164
 165                         $leading_junk = substr($res,0,strpos($res,'<?xml'));
 166
 167                         $res = substr($res,strpos($res,'<?xml'));
 168                         if(! strlen($res)) {
 169
 170                                         // No XML at all, this exchange is messed up really bad.
 171                                         // We shouldn't proceed, because the xml parser might choke,
 172                                         // and $status is going to be zero, which indicates success.
 173                                         // We can hardly call this a success.
 174
 175                                 notice( t('Response from remote site was not understood.') . EOL);
 176                                 return;
 177                         }
 178
 179                         if(strlen($leading_junk) && get_config('system','debugging')) {
 180
 181                                         // This might be more common. Mixed error text and some XML.
 182                                         // If we're configured for debugging, show the text. Proceed in either case.
 183
 184                                 notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
 185                         }
 186
 187                         $xml = simplexml_load_string($res);
 188                         $status = (int) $xml->status;
 189                         $message = unxmlify($xml->message);   // human readable text of what may have gone wrong.
 190                         switch($status) {
 191                                 case 0:
 192                                         notice( t("Confirmation completed successfully.") . EOL);
 193                                         if(strlen($message))
 194                                                 notice( t('Remote site reported: ') . $message . EOL);
 195                                         break;
 196                                 case 1:
 197                                         // birthday paradox - generate new dfrn-id and fall through.
 198                                         $new_dfrn_id = random_string();
 199                                         $r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
 200                                                 dbesc($new_dfrn_id),
 201                                                 intval($contact_id),
 202                                                 intval($uid)
 203                                         );
 204
 205                                 case 2:
 206                                         notice( t("Temporary failure. Please wait and try again.") . EOL);
 207                                         if(strlen($message))
 208                                                 notice( t('Remote site reported: ') . $message . EOL);
 209                                         break;
 210
 211
 212                                 case 3:
 213                                         notice( t("Introduction failed or was revoked.") . EOL);
 214                                         if(strlen($message))
 215                                                 notice( t('Remote site reported: ') . $message . EOL);
 216                                         break;
 217                                 }
 218
 219                         if(($status == 0) && ($intro_id)) {
 220
 221                                 // Success. Delete the notification.
 222
 223                                 $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 224                                         intval($intro_id),
 225                                         intval($uid)
 226                                 );
 227
 228                         }
 229
 230                         if($status != 0)
 231                                 return;
 232                 }
 233
 234                 // We have now established a relationship with the other site.
 235                 // Let's make our own personal copy of their profile photo so we don't have
 236                 // to always load it from their site.
 237
 238                 require_once("Photo.php");
 239
 240                 $photos = import_profile_photo($contact['photo'],$uid,$contact_id);
 241
 242                 logger('dfrn_confirm: confirm - imported photos');
 243
 244                 if($network === 'dfrn') {
 245
 246                         $new_relation = REL_VIP;
 247                         if(($relation == REL_FAN) || ($duplex))
 248                                 $new_relation = REL_BUD;
 249
 250                         if(($relation == REL_FAN) && ($duplex))
 251                                 $duplex = 0;
 252
 253                         $r = q("UPDATE `contact` SET `photo` = '%s',
 254                                 `thumb` = '%s',
 255                                 `micro` = '%s',
 256                                 `rel` = %d,
 257                                 `name-date` = '%s',
 258                                 `uri-date` = '%s',
 259                                 `avatar-date` = '%s',
 260                                 `blocked` = 0,
 261                                 `pending` = 0,
 262                                 `duplex` = %d,
 263                                 `network` = 'dfrn' WHERE `id` = %d LIMIT 1
 264                         ",
 265                                 dbesc($photos[0]),
 266                                 dbesc($photos[1]),
 267                                 dbesc($photos[2]),
 268                                 intval($new_relation),
 269                                 dbesc(datetime_convert()),
 270                                 dbesc(datetime_convert()),
 271                                 dbesc(datetime_convert()),
 272                                 intval($duplex),
 273                                 intval($contact_id)
 274                         );
 275                 }
 276                 else {
 277
 278                         $notify = '';
 279                         $poll   = '';
 280
 281                         // $network !== 'dfrn'
 282
 283                         $arr = lrdd($contact['url']);
 284                         if(count($arr)) {
 285                                 foreach($arr as $link) {
 286                                         if($link['@attributes']['rel'] === 'salmon')
 287                                                 $notify = $link['@attributes']['href'];
 288                                         if($link['@attributes']['rel'] === NAMESPACE_FEED)
 289                                                 $poll = $link['@attributes']['href'];
 290                                 }
 291                         }
 292
 293                         $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 294                                 intval($intro_id),
 295                                 intval($uid)
 296                         );
 297
 298
 299                         $r = q("UPDATE `contact` SET `photo` = '%s',
 300                                 `thumb` = '%s',
 301                                 `micro` = '%s',
 302                                 `name-date` = '%s',
 303                                 `uri-date` = '%s',
 304                                 `avatar-date` = '%s',
 305                                 `notify` = '%s',
 306                                 `poll` = '%s',
 307                                 `blocked` = 0,
 308                                 `pending` = 0,
 309                                 `network` = 'stat'
 310                                 WHERE `id` = %d LIMIT 1
 311                         ",
 312                                 dbesc($photos[0]),
 313                                 dbesc($photos[1]),
 314                                 dbesc($photos[2]),
 315                                 dbesc(datetime_convert()),
 316                                 dbesc(datetime_convert()),
 317                                 dbesc(datetime_convert()),
 318                                 dbesc($notify),
 319                                 dbesc($poll),
 320                                 intval($contact_id)
 321                         );
 322                 }
 323
 324                 if($r === false)
 325                                 notice( t('Unable to set contact photo.') . EOL);
 326
 327
 328                 // Let's send our user to the contact editor in case they want to
 329                 // do anything special with this new friend.
 330
 331                 if($handsfree === null)
 332                         goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
 333                 return;  //NOTREACHED
 334
 335         }
 336
 337
 338
 339         // End of first scenario. [Local confirmation of remote friend request].
 340
 341
 342
 343         // Begin scenario two. This is the remote response to the above scenario.
 344         // This will take place on the site that originally initiated the friend request.
 345         // In the section above where the confirming party makes a POST and
 346         // retrieves xml status information, they are communicating with the following code.
 347
 348         if(x($_POST,'source_url')) {
 349
 350                 // We are processing an external confirmation to an introduction created by our user.
 351
 352                 $public_key = $_POST['public_key'];
 353                 $dfrn_id    = hex2bin($_POST['dfrn_id']);
 354                 $source_url = hex2bin($_POST['source_url']);
 355                 $aes_key    = $_POST['aes_key'];
 356                 $duplex     = $_POST['duplex'];
 357                 $version_id = (float) $_POST['dfrn_version'];
 358
 359
 360                 logger('dfrn_confirm: request: POST=' . print_r($_POST,true), LOGGER_DATA);
 361
 362                 // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
 363
 364                 if(x($aes_key)) {
 365                         $aes_key = hex2bin($aes_key);
 366                         $public_key = hex2bin($public_key);
 367                 }
 368
 369                 // Find our user's account
 370
 371                 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
 372                         dbesc($node));
 373
 374                 if(! count($r)) {
 375                         $message = t('No user record found for ') . '\'' . $node . '\'';
 376                         xml_status(3,$message); // failure
 377                         // NOTREACHED
 378                 }
 379
 380                 $my_prvkey = $r[0]['prvkey'];
 381                 $local_uid = $r[0]['uid'];
 382
 383
 384                 if(! strstr($my_prvkey,'BEGIN RSA PRIVATE KEY')) {
 385                         $message = t('Our site encryption key is apparently messed up.');
 386                         xml_status(3,$message);
 387                 }
 388
 389                 // verify everything
 390
 391                 $decrypted_source_url = "";
 392                 openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey);
 393
 394
 395                 if(! strlen($decrypted_source_url)) {
 396                         $message = t('Empty site URL was provided or URL could not be decrypted by us.');
 397                         xml_status(3,$message);
 398                         // NOTREACHED
 399                 }
 400
 401                 $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 402                         dbesc($decrypted_source_url),
 403                         intval($local_uid)
 404                 );
 405
 406                 if(! count($ret)) {
 407                         // this is either a bogus confirmation (?) or we deleted the original introduction.
 408                         $message = t('Contact record was not found for you on our site.');
 409                         xml_status(3,$message);
 410                         return; // NOTREACHED
 411                 }
 412
 413                 $relation = $ret[0]['rel'];
 414
 415                 // Decrypt all this stuff we just received
 416
 417                 $foreign_pubkey = $ret[0]['site-pubkey'];
 418                 $dfrn_record    = $ret[0]['id'];
 419
 420                 $decrypted_dfrn_id = "";
 421                 openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey);
 422
 423                 if(strlen($aes_key)) {
 424                         $decrypted_aes_key = "";
 425                         openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey);
 426                         $dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key);
 427                 }
 428                 else {
 429                         $dfrn_pubkey = $public_key;
 430                 }
 431
 432                 $r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1",
 433                         dbesc($decrypted_dfrn_id)
 434                 );
 435                 if(count($r)) {
 436                         $message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
 437                         xml_status(1,$message); // Birthday paradox - duplicate dfrn-id
 438                         // NOTREACHED
 439                 }
 440
 441                 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d LIMIT 1",
 442                         dbesc($decrypted_dfrn_id),
 443                         dbesc($dfrn_pubkey),
 444                         intval($dfrn_record)
 445                 );
 446                 if(! count($r)) {
 447                         $message = t('Unable to set your contact credentials on our system.');
 448                         xml_status(3,$message);
 449                 }
 450
 451                 // We're good but now we have to scrape the profile photo and send notifications.
 452
 453
 454
 455                 $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
 456                         intval($dfrn_record));
 457
 458                 if(count($r))
 459                         $photo = $r[0]['photo'];
 460                 else
 461                         $photo = $a->get_baseurl() . '/images/default-profile.jpg';
 462
 463                 require_once("Photo.php");
 464
 465                 $photos = import_profile_photo($photo,$local_uid,$dfrn_record);
 466
 467                 logger('dfrn_confirm: request - photos imported');
 468
 469                 $new_relation = REL_FAN;
 470                 if(($relation == REL_VIP) || ($duplex))
 471                         $new_relation = REL_BUD;
 472
 473                 if(($relation == REL_VIP) && ($duplex))
 474                         $duplex = 0;
 475
 476                 $r = q("UPDATE `contact` SET
 477                         `photo` = '%s',
 478                         `thumb` = '%s',
 479                         `micro` = '%s',
 480                         `rel` = %d,
 481                         `name-date` = '%s',
 482                         `uri-date` = '%s',
 483                         `avatar-date` = '%s',
 484                         `blocked` = 0,
 485                         `pending` = 0,
 486                         `duplex` = %d,
 487                         `network` = 'dfrn' WHERE `id` = %d LIMIT 1
 488                 ",
 489                         dbesc($photos[0]),
 490                         dbesc($photos[1]),
 491                         dbesc($photos[2]),
 492                         intval($new_relation),
 493                         dbesc(datetime_convert()),
 494                         dbesc(datetime_convert()),
 495                         dbesc(datetime_convert()),
 496                         intval($duplex),
 497                         intval($dfrn_record)
 498                 );
 499                 if($r === false) {    // indicates schema is messed up or total db failure
 500                         $message = t('Unable to update your contact profile details on our system');
 501                         xml_status(3,$message);
 502                 }
 503
 504                 // Otherwise everything seems to have worked and we are almost done. Yay!
 505                 // Send an email notification
 506
 507                 $r = q("SELECT * FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 508                         WHERE `contact`.`id` = %d LIMIT 1",
 509                         intval($dfrn_record)
 510                 );
 511                 if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {
 512
 513                         $tpl = (($new_relation == REL_BUD)
 514                                 ? load_view_file('view/friend_complete_eml.tpl')
 515                                 : load_view_file('view/intro_complete_eml.tpl'));
 516
 517                         $email_tpl = replace_macros($tpl, array(
 518                                 '$sitename' => $a->config['sitename'],
 519                                 '$siteurl' =>  $a->get_baseurl(),
 520                                 '$username' => $r[0]['username'],
 521                                 '$email' => $r[0]['email'],
 522                                 '$fn' => $r[0]['name'],
 523                                 '$dfrn_url' => $r[0]['url'],
 524                                 '$uid' => $newuid )
 525                         );
 526
 527                         $res = mail($r[0]['email'], t("Connection accepted at ") . $a->config['sitename'],
 528                                 $email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] );
 529                         if(!$res) {
 530                                 // pointless throwing an error here and confusing the person at the other end of the wire.
 531                         }
 532                 }
 533                 xml_status(0); // Success
 534                 return; // NOTREACHED
 535
 536                         ////////////////////// End of this scenario ///////////////////////////////////////////////
 537         }
 538
 539         // somebody arrived here by mistake or they are fishing. Send them to the homepage.
 540
 541         goaway($a->get_baseurl());
 542         // NOTREACHED
 543
 544 }