mod/dfrn_confirm.php

   1 <?php
   2
   3 // There are two possible entry points.
   4
   5 function dfrn_confirm_post(&$a,$handsfree = null) {
   6
   7         if(is_array($handsfree)) {
   8
   9                 // called directly from dfrn_request due to automatic friend acceptance
  10                 // any $_POST parameters we may require are supplied in the $handsfree array
  11
  12                 $node = $handsfree['node'];
  13                 $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
  14
  15         }
  16         else {
  17                 if($a->argc > 1)
  18                         $node = $a->argv[1];
  19         }
  20
  21                 // Main entry point. Our user received a friend request notification (perhaps
  22                 // from another site) and clicked 'Approve'. $POST['source_url'] is not set.
  23                 // OR we have been called directly from dfrn_request ($handsfree != null) due to
  24                 // this being a page type which supports automatic friend acceptance.
  25
  26         if(! x($_POST,'source_url')) {
  27
  28                 $uid = ((is_array($handsfree)) ? $handsfree['uid'] : local_user());
  29
  30                 if(! $uid) {
  31                         notice( t('Permission denied.') . EOL );
  32                         return;
  33                 }
  34
  35                 $user = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
  36                         intval($uid)
  37                 );
  38
  39                 if(! $user) {
  40                         notice( t('Profile not found.') . EOL );
  41                         return;
  42                 }
  43
  44
  45                 // These come from either the friend request notification form or $handsfree array.
  46
  47                 if(is_array($handsfree)) {
  48                         $dfrn_id = $handsfree['dfrn_id'];
  49                         $intro_id = $handsfree['intro_id'];
  50                         $duplex = $handsfree['duplex'];
  51                 }
  52                 else {
  53                         $dfrn_id  = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : "");
  54                         $intro_id = intval($_POST['intro_id']);
  55                         $duplex   = intval($_POST['duplex']);
  56                         $cid      = intval($_POST['contact_id']);
  57                 }
  58
  59                 // The other person will have been issued an ID when they first requested friendship.
  60                 // Locate their record. At this time, their record will have both pending and blocked set to 1.
  61                 // There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
  62
  63                 $r = q("SELECT * FROM `contact` WHERE ( ( `issued-id` != '' AND `issued-id` = '%s' ) OR ( `id` = %d AND `id` != 0 ) ) AND `uid` = %d LIMIT 1",
  64                                 dbesc($dfrn_id),
  65                                 intval($cid),
  66                                 intval($uid)
  67                 );
  68
  69                 if(! count($r)) {
  70                         notice( t('Contact not found.') . EOL );
  71                         return;
  72                 }
  73
  74                 $contact = $r[0];
  75
  76                 $contact_id   = $contact['id'];
  77                 $relation     = $contact['rel'];
  78                 $site_pubkey  = $contact['site-pubkey'];
  79                 $dfrn_confirm = $contact['confirm'];
  80                 $aes_allow    = $contact['aes_allow'];
  81
  82
  83                 if($contact['network'] === 'dfrn') {
  84
  85                         // Generate a key pair for all further communications with this person.
  86                         // We have a keypair for every contact, and a site key for unknown people.
  87                         // This provides a means to carry on relationships with other people if
  88                         // any single key is compromised. It is a robust key. We're much more
  89                         // worried about key leakage than anybody cracking it.
  90
  91                         $res = openssl_pkey_new(array(
  92                                 'digest_alg' => 'whirlpool',
  93                                 'private_key_bits' => 4096,
  94                                 'encrypt_key' => false )
  95                         );
  96
  97
  98                         $private_key = '';
  99
 100                         openssl_pkey_export($res, $private_key);
 101
 102                         $pubkey = openssl_pkey_get_details($res);
 103                         $public_key = $pubkey["key"];
 104
 105                         // Save the private key. Send them the public key.
 106
 107                         $r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
 108                                 dbesc($private_key),
 109                                 intval($contact_id),
 110                                 intval($uid)
 111                         );
 112
 113                         $params = array();
 114
 115                         // Per the protocol document, we will verify both ends by encrypting the dfrn_id with our
 116                         // site private key (person on the other end can decrypt it with our site public key).
 117                         // Then encrypt our profile URL with the other person's site public key. They can decrypt
 118                         // it with their site private key. If the decryption on the other end fails for either
 119                         // item, it indicates tampering or key failure on at least one site and we will not be
 120                         // able to provide a secure communication pathway.
 121
 122                         // If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
 123                         // or later) then we encrypt the personal public key we send them using AES-256-CBC and a
 124                         // random key which is encrypted with their site public key.
 125
 126                         $src_aes_key = random_string();
 127
 128                         $result = '';
 129                         openssl_private_encrypt($dfrn_id,$result,$user[0]['prvkey']);
 130
 131                         $params['dfrn_id'] = bin2hex($result);
 132                         $params['public_key'] = $public_key;
 133
 134
 135                         $my_url = $a->get_baseurl() . '/profile/' . $user[0]['nickname'];
 136
 137                         openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
 138                         $params['source_url'] = bin2hex($params['source_url']);
 139
 140                         if($aes_allow && function_exists('openssl_encrypt')) {
 141                                 openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
 142                                 $params['aes_key'] = bin2hex($params['aes_key']);
 143                                 $params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
 144                         }
 145
 146                         $params['dfrn_version'] = DFRN_PROTOCOL_VERSION ;
 147                         if($duplex == 1)
 148                                 $params['duplex'] = 1;
 149
 150                         // POST all this stuff to the other site.
 151
 152                         $res = post_url($dfrn_confirm,$params);
 153
 154                         // Now figure out what they responded. Try to be robust if the remote site is
 155                         // having difficulty and throwing up errors of some kind.
 156
 157                         $leading_junk = substr($res,0,strpos($res,'<?xml'));
 158
 159                         $res = substr($res,strpos($res,'<?xml'));
 160                         if(! strlen($res)) {
 161
 162                                         // No XML at all, this exchange is messed up really bad.
 163                                         // We shouldn't proceed, because the xml parser might choke,
 164                                         // and $status is going to be zero, which indicates success.
 165                                         // We can hardly call this a success.
 166
 167                                 notice( t('Response from remote site was not understood.') . EOL);
 168                                 return;
 169                         }
 170
 171                         if(strlen($leading_junk) && get_config('system','debugging')) {
 172
 173                                         // This might be more common. Mixed error text and some XML.
 174                                         // If we're configured for debugging, show the text. Proceed in either case.
 175
 176                                 notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
 177                         }
 178
 179                         $xml = simplexml_load_string($res);
 180                         $status = (int) $xml->status;
 181                         $message = unxmlify($xml->message);   // human readable text of what may have gone wrong.
 182                         switch($status) {
 183                                 case 0:
 184                                         notice( t("Confirmation completed successfully.") . EOL);
 185                                         if(strlen($message))
 186                                                 notice( t('Remote site reported: ') . $message . EOL);
 187                                         break;
 188                                 case 1:
 189                                         // birthday paradox - generate new dfrn-id and fall through.
 190                                         $new_dfrn_id = random_string();
 191                                         $r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
 192                                                 dbesc($new_dfrn_id),
 193                                                 intval($contact_id),
 194                                                 intval($uid)
 195                                         );
 196
 197                                 case 2:
 198                                         notice( t("Temporary failure. Please wait and try again.") . EOL);
 199                                         if(strlen($message))
 200                                                 notice( t('Remote site reported: ') . $message . EOL);
 201                                         break;
 202
 203
 204                                 case 3:
 205                                         notice( t("Introduction failed or was revoked.") . EOL);
 206                                         if(strlen($message))
 207                                                 notice( t('Remote site reported: ') . $message . EOL);
 208                                         break;
 209                                 }
 210
 211                         if(($status == 0) && ($intro_id)) {
 212
 213                                 // Success. Delete the notification.
 214
 215                                 $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 216                                         intval($intro_id),
 217                                         intval($uid)
 218                                 );
 219
 220                         }
 221
 222                         if($status != 0)
 223                                 return;
 224                 }
 225
 226                 // We have now established a relationship with the other site.
 227                 // Let's make our own personal copy of their profile photo so we don't have
 228                 // to always load it from their site.
 229
 230                 require_once("Photo.php");
 231
 232                 $photo_failure = false;
 233
 234                 $filename = basename($contact['photo']);
 235                 $img_str = fetch_url($contact['photo'],true);
 236                 $img = new Photo($img_str);
 237                 if($img->is_valid()) {
 238
 239                         $img->scaleImageSquare(175);
 240
 241                         $hash = photo_new_resource();
 242
 243                         $r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 4 );
 244
 245                         if($r === false)
 246                                 $photo_failure = true;
 247
 248                         $img->scaleImage(80);
 249
 250                         $r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 5 );
 251
 252                         if($r === false)
 253                                 $photo_failure = true;
 254
 255                         $photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
 256                         $thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
 257                 }
 258                 else
 259                         $photo_failure = true;
 260
 261                 if($photo_failure) {
 262                         $photo = $a->get_baseurl() . '/images/default-profile.jpg';
 263                         $thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
 264                 }
 265
 266
 267                 if($contact['network'] === 'dfrn') {
 268
 269                         $new_relation = REL_VIP;
 270                         if(($relation == REL_FAN) || ($duplex))
 271                                 $new_relation = REL_BUD;
 272
 273                         $r = q("UPDATE `contact` SET `photo` = '%s',
 274                                 `thumb` = '%s',
 275                                 `rel` = %d,
 276                                 `name-date` = '%s',
 277                                 `uri-date` = '%s',
 278                                 `avatar-date` = '%s',
 279                                 `blocked` = 0,
 280                                 `pending` = 0,
 281                                 `duplex` = %d,
 282                                 `network` = 'dfrn' WHERE `id` = %d LIMIT 1
 283                         ",
 284                                 dbesc($photo),
 285                                 dbesc($thumb),
 286                                 intval($new_relation),
 287                                 dbesc(datetime_convert()),
 288                                 dbesc(datetime_convert()),
 289                                 dbesc(datetime_convert()),
 290                                 intval($duplex),
 291                                 intval($contact_id)
 292                         );
 293                 }
 294                 else {
 295
 296                         $notify = '';
 297                         $poll   = '';
 298
 299                         // $contact['network'] !== 'dfrn'
 300
 301                         $arr = lrdd($contact['url']);
 302                         if(count($arr)) {
 303                                 foreach($arr as $link) {
 304                                         if($link['@attributes']['rel'] === 'salmon')
 305                                                 $notify = $link['@attributes']['href'];
 306                                         if($link['@attributes']['rel'] === NAMESPACE_FEED)
 307                                                 $poll = $link['@attributes']['href'];
 308                                 }
 309                         }
 310
 311                         $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 312                                 intval($intro_id),
 313                                 intval($uid)
 314                         );
 315
 316                         $r = q("UPDATE `contact` SET `photo` = '%s',
 317                                 `thumb` = '%s',
 318                                 `name-date` = '%s',
 319                                 `uri-date` = '%s',
 320                                 `avatar-date` = '%s',
 321                                 `notify` = '%s',
 322                                 `poll` = '%s',
 323                                 `blocked` = 0,
 324                                 `pending` = 0
 325                                 WHERE `id` = %d LIMIT 1
 326                         ",
 327                                 dbesc($photo),
 328                                 dbesc($thumb),
 329                                 dbesc(datetime_convert()),
 330                                 dbesc(datetime_convert()),
 331                                 dbesc(datetime_convert()),
 332                                 dbesc($notify),
 333                                 dbesc($poll),
 334                                 intval($contact_id)
 335                         );
 336                 }
 337
 338                 if($r === false)
 339                                 notice( t('Unable to set contact photo.') . EOL);
 340
 341
 342                 // Let's send our user to the contact editor in case they want to
 343                 // do anything special with this new friend.
 344
 345                 if($handsfree === null)
 346                         goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
 347                 return;  //NOTREACHED
 348
 349         }
 350
 351
 352
 353         // End of first scenario. [Local confirmation of remote friend request].
 354
 355
 356
 357         // Begin scenario two. This is the remote response to the above scenario.
 358         // This will take place on the site that originally initiated the friend request.
 359         // In the section above where the confirming party makes a POST and
 360         // retrieves xml status information, they are communicating with the following code.
 361
 362         if(x($_POST,'source_url')) {
 363
 364                 // We are processing an external confirmation to an introduction created by our user.
 365
 366                 $public_key = $_POST['public_key'];
 367                 $dfrn_id    = hex2bin($_POST['dfrn_id']);
 368                 $source_url = hex2bin($_POST['source_url']);
 369                 $aes_key    = $_POST['aes_key'];
 370                 $duplex     = $_POST['duplex'];
 371                 $version_id = (float) $_POST['dfrn_version'];
 372
 373
 374                 // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
 375
 376                 if(x($aes_key)) {
 377                         $aes_key = hex2bin($aes_key);
 378                         $public_key = hex2bin($public_key);
 379                 }
 380
 381                 // Find our user's account
 382
 383                 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
 384                         dbesc($node));
 385
 386                 if(! count($r)) {
 387                         $message = t('No user record found for ') . '\'' . $node . '\'';
 388                         xml_status(3,$message); // failure
 389                         // NOTREACHED
 390                 }
 391
 392                 $my_prvkey = $r[0]['prvkey'];
 393                 $local_uid = $r[0]['uid'];
 394
 395
 396                 if(! strstr($my_prvkey,'BEGIN RSA PRIVATE KEY')) {
 397                         $message = t('Our site encryption key is apparently messed up.');
 398                         xml_status(3,$message);
 399                 }
 400
 401                 // verify everything
 402
 403                 $decrypted_source_url = "";
 404                 openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey);
 405
 406
 407                 if(! strlen($decrypted_source_url)) {
 408                         $message = t('Empty site URL was provided or URL could not be decrypted by us.');
 409                         xml_status(3,$message);
 410                         // NOTREACHED
 411                 }
 412
 413                 $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 414                         dbesc($decrypted_source_url),
 415                         intval($local_uid)
 416                 );
 417
 418                 if(! count($ret)) {
 419                         // this is either a bogus confirmation (?) or we deleted the original introduction.
 420                         $message = t('Contact record was not found for you on our site.');
 421                         xml_status(3,$message);
 422                         return; // NOTREACHED
 423                 }
 424
 425                 $relation = $ret[0]['rel'];
 426
 427                 // Decrypt all this stuff we just received
 428
 429                 $foreign_pubkey = $ret[0]['site-pubkey'];
 430                 $dfrn_record    = $ret[0]['id'];
 431
 432                 $decrypted_dfrn_id = "";
 433                 openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey);
 434
 435                 if(strlen($aes_key)) {
 436                         $decrypted_aes_key = "";
 437                         openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey);
 438                         $dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key);
 439                 }
 440                 else {
 441                         $dfrn_pubkey = $public_key;
 442                 }
 443
 444                 $r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1",
 445                         dbesc($decrypted_dfrn_id),
 446                         intval($local_uid)
 447                 );
 448                 if(count($r)) {
 449                         $message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
 450                         xml_status(1,$message); // Birthday paradox - duplicate dfrn-id
 451                         // NOTREACHED
 452                 }
 453
 454                 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d LIMIT 1",
 455                         dbesc($decrypted_dfrn_id),
 456                         dbesc($dfrn_pubkey),
 457                         intval($dfrn_record)
 458                 );
 459                 if(! count($r)) {
 460                         $message = t('Unable to set your contact credentials on our system.');
 461                         xml_status(3,$message);
 462                 }
 463
 464                 // We're good but now we have to scrape the profile photo and send notifications.
 465
 466                 require_once("Photo.php");
 467
 468                 $photo_failure = false;
 469
 470                 $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
 471                         intval($dfrn_record));
 472                 if(count($r)) {
 473
 474                         $filename = basename($r[0]['photo']);
 475                         $img_str = fetch_url($r[0]['photo'],true);
 476                         $img = new Photo($img_str);
 477                         if($img->is_valid()) {
 478
 479                                 $img->scaleImageSquare(175);
 480
 481                                 $hash = photo_new_resource();
 482
 483                                 $r = $img->store($local_uid, $dfrn_record, $hash, $filename, t('Contact Photos') , 4);
 484
 485                                 if($r === false)
 486                                         $photo_failure = true;
 487
 488                                 $img->scaleImage(80);
 489                                 $r = $img->store($local_uid, $dfrn_record, $hash, $filename, t('Contact Photos') , 5);
 490
 491                                 if($r === false)
 492                                         $photo_failure = true;
 493
 494                                 $photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
 495                                 $thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
 496                         }
 497                         else
 498                                 $photo_failure = true;
 499                 }
 500                 else
 501                         $photo_failure = true;
 502
 503                 if($photo_failure) {
 504                         $photo = $a->get_baseurl() . '/images/default-profile.jpg';
 505                         $thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
 506                 }
 507
 508                 $new_relation = REL_FAN;
 509                 if(($relation == REL_VIP) || ($duplex))
 510                         $new_relation = REL_BUD;
 511
 512                 $r = q("UPDATE `contact` SET
 513                         `photo` = '%s',
 514                         `thumb` = '%s',
 515                         `rel` = %d,
 516                         `name-date` = '%s',
 517                         `uri-date` = '%s',
 518                         `avatar-date` = '%s',
 519                         `blocked` = 0,
 520                         `pending` = 0,
 521                         `duplex` = %d,
 522                         `network` = 'dfrn' WHERE `id` = %d LIMIT 1
 523                 ",
 524                         dbesc($photo),
 525                         dbesc($thumb),
 526                         intval($new_relation),
 527                         dbesc(datetime_convert()),
 528                         dbesc(datetime_convert()),
 529                         dbesc(datetime_convert()),
 530                         intval($duplex),
 531                         intval($dfrn_record)
 532                 );
 533                 if($r === false) {    // indicates schema is messed up or total db failure
 534                         $message = t('Unable to update your contact profile details on our system');
 535                         xml_status(3,$message);
 536                 }
 537
 538                 // Otherwise everything seems to have worked and we are almost done. Yay!
 539                 // Send an email notification
 540
 541                 $r = q("SELECT * FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 542                         WHERE `contact`.`id` = %d LIMIT 1",
 543                         intval($dfrn_record)
 544                 );
 545                 if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {
 546
 547                         $tpl = (($new_relation == REL_BUD)
 548                                 ? load_view_file('view/friend_complete_eml.tpl')
 549                                 : load_view_file('view/intro_complete_eml.tpl'));
 550
 551                         $email_tpl = replace_macros($tpl, array(
 552                                 '$sitename' => $a->config['sitename'],
 553                                 '$siteurl' =>  $a->get_baseurl(),
 554                                 '$username' => $r[0]['username'],
 555                                 '$email' => $r[0]['email'],
 556                                 '$fn' => $r[0]['name'],
 557                                 '$dfrn_url' => $r[0]['url'],
 558                                 '$uid' => $newuid )
 559                         );
 560
 561                         $res = mail($r[0]['email'], t("Connection accepted at ") . $a->config['sitename'],
 562                                 $email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER[SERVER_NAME] );
 563                         if(!$res) {
 564                                 // pointless throwing an error here and confusing the person at the other end of the wire.
 565                         }
 566                 }
 567                 xml_status(0); // Success
 568                 return; // NOTREACHED
 569
 570                         ////////////////////// End of this scenario ///////////////////////////////////////////////
 571         }
 572
 573         // somebody arrived here by mistake or they are fishing. Send them to the homepage.
 574
 575         goaway($a->get_baseurl());
 576         // NOTREACHED
 577
 578 }