mod/dfrn_confirm.php

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