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