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