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                 // Note: We can send any of these things as binary blobs because they are being POST'ed.
  93                 // Any protocol conversations (notify, poll) which perform GET require bin2hex of all the
  94                 // binary stuff.
  95
  96                 $src_aes_key = random_string();
  97
  98                 $result = '';
  99                 openssl_private_encrypt($dfrn_id,$result,$a->user['prvkey']);
 100
 101                 $params['dfrn_id'] = bin2hex($result);
 102                 $params['public_key'] = $public_key;
 103
 104
 105                 $my_url = $a->get_baseurl() . '/profile/' . $a->user['nickname'];
 106
 107                 openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
 108                 $params['source_url'] = bin2hex($params['source_url']);
 109
 110                 if($aes_allow && function_exists('openssl_encrypt')) {
 111                         openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
 112                         $params['aes_key'] = bin2hex($params['aes_key']);
 113                         $params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
 114                 }
 115
 116                 $params['dfrn_version'] = '2.0';
 117                 if($duplex == 1)
 118                         $params['duplex'] = 1;
 119
 120                 // POST all this stuff to the other site.
 121
 122                 $res = post_url($dfrn_confirm,$params);
 123
 124                 // Now figure out what they responded. Try to be robust if the remote site is
 125                 // having difficulty and throwing up errors of some kind.
 126
 127                 $leading_junk = substr($res,0,strpos($res,'<?xml'));
 128
 129                 $res = substr($res,strpos($res,'<?xml'));
 130                 if(! strlen($res)) {
 131
 132                                 // No XML at all, this exchange is messed up really bad.
 133                                 // We shouldn't proceed, because the xml parser might choke,
 134                                 // and $status is going to be zero, which indicates success.
 135                                 // We can hardly call this a success.
 136
 137                         notice( t('Response from remote site was not understood.') . EOL);
 138                         return;
 139                 }
 140
 141                 if(strlen($leading_junk) && get_config('system','debugging')) {
 142
 143                                 // This might be more common. Mixed error text and some XML.
 144                                 // If we're configured for debugging, show the text. Proceed in either case.
 145
 146                         notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
 147                 }
 148
 149                 $xml = simplexml_load_string($res);
 150                 $status = (int) $xml->status;
 151                 $message = unxmlify($xml->message);   // human readable text of what may have gone wrong.
 152                 switch($status) {
 153                         case 0:
 154                                 notice( t("Confirmation completed successfully.") . EOL);
 155                                 if(strlen($message))
 156                                         notice( t('Remote site reported: ') . $message . EOL);
 157                                 break;
 158                         case 1:
 159                                 // birthday paradox - generate new dfrn-id and fall through.
 160                                 $new_dfrn_id = random_string();
 161                                 $r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
 162                                         dbesc($new_dfrn_id),
 163                                         intval($contact_id),
 164                                         intval($uid)
 165                                 );
 166
 167                         case 2:
 168                                 notice( t("Temporary failure. Please wait and try again.") . EOL);
 169                                 if(strlen($message))
 170                                         notice( t('Remote site reported: ') . $message . EOL);
 171                                 break;
 172
 173
 174                         case 3:
 175                                 notice( t("Introduction failed or was revoked.") . EOL);
 176                                 if(strlen($message))
 177                                         notice( t('Remote site reported: ') . $message . EOL);
 178                                 break;
 179                         }
 180
 181                 if(($status == 0) && ($intro_id)) {
 182
 183                         // Success. Delete the notification.
 184
 185                         $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 186                                 intval($intro_id),
 187                                 intval($uid)
 188                         );
 189
 190                 }
 191
 192                 if($status != 0)
 193                         return;
 194
 195                 // We have now established a relationship with the other site.
 196                 // Let's make our own personal copy of their profile photo so we don't have
 197                 // to always load it from their site.
 198
 199                 require_once("Photo.php");
 200
 201                 $photo_failure = false;
 202
 203                 $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
 204                         intval($contact_id));
 205                 if(count($r)) {
 206
 207                         $filename = basename($r[0]['photo']);
 208                         $img_str = fetch_url($r[0]['photo'],true);
 209                         $img = new Photo($img_str);
 210                         if($img->is_valid()) {
 211
 212                                 $img->scaleImageSquare(175);
 213
 214                                 $hash = photo_new_resource();
 215
 216                                 $r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 4 );
 217
 218                                 if($r === false)
 219                                         $photo_failure = true;
 220
 221                                 $img->scaleImage(80);
 222
 223                                 $r = $img->store($uid, $contact_id, $hash, $filename, t('Contact Photos'), 5 );
 224
 225                                 if($r === false)
 226                                         $photo_failure = true;
 227
 228                                 $photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
 229                                 $thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
 230                         }
 231                         else
 232                                 $photo_failure = true;
 233                 }
 234                 else
 235                         $photo_failure = true;
 236
 237                 if($photo_failure) {
 238                         $photo = $a->get_baseurl() . '/images/default-profile.jpg';
 239                         $thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
 240                 }
 241
 242                 $new_relation = REL_VIP;
 243                 if(($relation == REL_FAN) || ($duplex))
 244                         $new_relation = REL_BUD;
 245
 246                 $r = q("UPDATE `contact` SET `photo` = '%s',
 247                         `thumb` = '%s',
 248                         `rel` = %d,
 249                         `name-date` = '%s',
 250                         `uri-date` = '%s',
 251                         `avatar-date` = '%s',
 252                         `blocked` = 0,
 253                         `pending` = 0,
 254                         `duplex` = %d,
 255                         `network` = 'dfrn' WHERE `id` = %d LIMIT 1
 256                 ",
 257                         dbesc($photo),
 258                         dbesc($thumb),
 259                         intval($new_relation),
 260                         dbesc(datetime_convert()),
 261                         dbesc(datetime_convert()),
 262                         dbesc(datetime_convert()),
 263                         intval($duplex),
 264                         intval($contact_id)
 265                 );
 266                 if($r === false)
 267                         notice( t('Unable to set contact photo.') . EOL);
 268
 269
 270                 // Let's send our user to the contact editor in case they want to
 271                 // do anything special with this new friend.
 272
 273                 goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
 274                 return;  //NOTREACHED
 275         }
 276
 277
 278
 279         // End of first scenario. [Local confirmation of remote friend request].
 280
 281
 282
 283         // Begin scenario two. This is the remote response to the above scenario.
 284         // This will take place on the site that originally initiated the friend request.
 285         // In the section above where the confirming party makes a POST and
 286         // retrieves xml status information, they are communicating with the following code.
 287
 288         if(x($_POST,'source_url')) {
 289
 290                 // We are processing an external confirmation to an introduction created by our user.
 291
 292                 $public_key = $_POST['public_key'];
 293                 $dfrn_id    = hex2bin($_POST['dfrn_id']);
 294                 $source_url = hex2bin($_POST['source_url']);
 295                 $aes_key    = hex2bin($_POST['aes_key']);
 296                 $duplex     = $_POST['duplex'];
 297                 $version_id = $_POST['dfrn_version'];
 298
 299                 // Find our user's account
 300
 301                 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
 302                         dbesc($node));
 303
 304                 if(! count($r)) {
 305                         $message = t('No user record found for ') . '\'' . $node . '\'';
 306                         xml_status(3,$message); // failure
 307                         // NOTREACHED
 308                 }
 309
 310                 $my_prvkey = $r[0]['prvkey'];
 311                 $local_uid = $r[0]['uid'];
 312
 313
 314                 if(! strstr($my_prvkey,'BEGIN RSA PRIVATE KEY')) {
 315                         $message = t('Our site encryption key is apparently messed up.');
 316                         xml_status(3,$message);
 317                 }
 318
 319                 // verify everything
 320
 321                 $decrypted_source_url = "";
 322                 openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey);
 323
 324
 325                 if(! strlen($decrypted_source_url)) {
 326                         $message = t('Empty site URL was provided or URL could not be decrypted by us.');
 327                         xml_status(3,$message);
 328                         // NOTREACHED
 329                 }
 330
 331                 $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 332                         dbesc($decrypted_source_url),
 333                         intval($local_uid)
 334                 );
 335
 336                 if(! count($ret)) {
 337                         // this is either a bogus confirmation (?) or we deleted the original introduction.
 338                         $message = t('Contact record was not found for you on our site.');
 339                         xml_status(3,$message);
 340                         return; // NOTREACHED
 341                 }
 342
 343                 $relation = $ret[0]['rel'];
 344
 345                 // Decrypt all this stuff we just received
 346
 347                 $foreign_pubkey = $ret[0]['site-pubkey'];
 348                 $dfrn_record    = $ret[0]['id'];
 349
 350                 $decrypted_dfrn_id = "";
 351                 openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey);
 352
 353                 if(strlen($aes_key)) {
 354                         $decrypted_aes_key = "";
 355                         openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey);
 356                         $dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key);
 357                 }
 358                 else {
 359                         $dfrn_pubkey = $public_key;
 360                 }
 361
 362                 $r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1",
 363                         dbesc($decrypted_dfrn_id),
 364                         intval($local_uid)
 365                 );
 366                 if(count($r)) {
 367                         $message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
 368                         xml_status(1,$message); // Birthday paradox - duplicate dfrn-id
 369                         // NOTREACHED
 370                 }
 371
 372                 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d LIMIT 1",
 373                         dbesc($decrypted_dfrn_id),
 374                         dbesc($dfrn_pubkey),
 375                         intval($dfrn_record)
 376                 );
 377                 if(! count($r)) {
 378                         $message = t('Unable to set your contact credentials on our system.');
 379                         xml_status(3,$message);
 380                 }
 381
 382                 // We're good but now we have to scrape the profile photo and send notifications.
 383
 384                 require_once("Photo.php");
 385
 386                 $photo_failure = false;
 387
 388                 $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
 389                         intval($dfrn_record));
 390                 if(count($r)) {
 391
 392                         $filename = basename($r[0]['photo']);
 393                         $img_str = fetch_url($r[0]['photo'],true);
 394                         $img = new Photo($img_str);
 395                         if($img->is_valid()) {
 396
 397                                 $img->scaleImageSquare(175);
 398
 399                                 $hash = photo_new_resource();
 400
 401                                 $r = $img->store($local_uid, $dfrn_record, $hash, $filename, t('Contact Photos') , 4);
 402
 403                                 if($r === false)
 404                                         $photo_failure = true;
 405
 406                                 $img->scaleImage(80);
 407                                 $r = $img->store($local_uid, $dfrn_record, $hash, $filename, t('Contact Photos') , 5);
 408
 409                                 if($r === false)
 410                                         $photo_failure = true;
 411
 412                                 $photo = $a->get_baseurl() . '/photo/' . $hash . '-4.jpg';
 413                                 $thumb = $a->get_baseurl() . '/photo/' . $hash . '-5.jpg';
 414                         }
 415                         else
 416                                 $photo_failure = true;
 417                 }
 418                 else
 419                         $photo_failure = true;
 420
 421                 if($photo_failure) {
 422                         $photo = $a->get_baseurl() . '/images/default-profile.jpg';
 423                         $thumb = $a->get_baseurl() . '/images/default-profile-sm.jpg';
 424                 }
 425
 426                 $new_relation = REL_FAN;
 427                 if(($relation == REL_VIP) || ($duplex))
 428                         $new_relation = REL_BUD;
 429
 430                 $r = q("UPDATE `contact` SET
 431                         `photo` = '%s',
 432                         `thumb` = '%s',
 433                         `rel` = %d,
 434                         `name-date` = '%s',
 435                         `uri-date` = '%s',
 436                         `avatar-date` = '%s',
 437                         `blocked` = 0,
 438                         `pending` = 0,
 439                         `duplex` = %d,
 440                         `network` = 'dfrn' WHERE `id` = %d LIMIT 1
 441                 ",
 442                         dbesc($photo),
 443                         dbesc($thumb),
 444                         intval($new_relation),
 445                         dbesc(datetime_convert()),
 446                         dbesc(datetime_convert()),
 447                         dbesc(datetime_convert()),
 448                         intval($duplex),
 449                         intval($dfrn_record)
 450                 );
 451                 if($r === false) { // indicates schema is messed up or total db failure
 452                         $message = t('Unable to update your contact profile details on our system');
 453                         xml_status(3,$message);
 454                 }
 455
 456                 // Otherwise everything seems to have worked and we are almost done. Yay!
 457                 // Send an email notification
 458
 459                 $r = q("SELECT * FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 460                         WHERE `contact`.`id` = %d LIMIT 1",
 461                         intval($dfrn_record)
 462                 );
 463                 if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {
 464
 465                         $tpl = (($new_relation == REL_BUD)
 466                                 ? load_view_file('view/friend_complete_eml.tpl')
 467                                 : load_view_file('view/intro_complete_eml.tpl'));
 468
 469                         $email_tpl = replace_macros($tpl, array(
 470                                 '$sitename' => $a->config['sitename'],
 471                                 '$siteurl' =>  $a->get_baseurl(),
 472                                 '$username' => $r[0]['username'],
 473                                 '$email' => $r[0]['email'],
 474                                 '$fn' => $r[0]['name'],
 475                                 '$dfrn_url' => $r[0]['url'],
 476                                 '$uid' => $newuid )
 477                         );
 478
 479                         $res = mail($r[0]['email'], t("Connection accepted at ") . $a->config['sitename'],
 480                                 $email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER[SERVER_NAME] );
 481                         if(!$res) {
 482                                 notice( t("Email notification failed.") . EOL );
 483                         }
 484                 }
 485                 xml_status(0); // Success
 486                 return; // NOTREACHED
 487
 488                         ////////////////////// End of this scenario ///////////////////////////////////////////////
 489         }
 490
 491         // somebody arrived here by mistake or they are fishing. Send them to the homepage.
 492
 493         goaway($a->get_baseurl());
 494         // NOTREACHED
 495
 496 }