mod/dfrn_confirm.php

   1 <?php
   2
   3 /*
   4  * Module: dfrn_confirm
   5  * Purpose: Friendship acceptance for DFRN contacts
   6  *
   7  * There are two possible entry points and three scenarios.
   8  *
   9  *   1. A form was submitted by our user approving a friendship that originated elsewhere.
  10  *      This may also be called from dfrn_request to automatically approve a friendship.
  11  *
  12  *   2. We may be the target or other side of the conversation to scenario 1, and will
  13  *      interact with that process on our own user's behalf.
  14  *
  15  */
  16
  17 function dfrn_confirm_post(&$a,$handsfree = null) {
  18
  19         if(is_array($handsfree)) {
  20
  21                 /**
  22                  * We were called directly from dfrn_request due to automatic friend acceptance.
  23                  * Any $_POST parameters we may require are supplied in the $handsfree array.
  24                  *
  25                  */
  26
  27                 $node = $handsfree['node'];
  28                 $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
  29
  30         }
  31         else {
  32                 if($a->argc > 1)
  33                         $node = $a->argv[1];
  34         }
  35
  36                 /**
  37                  *
  38                  * Main entry point. Scenario 1. Our user received a friend request notification (perhaps
  39                  * from another site) and clicked 'Approve'.
  40                  * $POST['source_url'] is not set. If it is, it indicates Scenario 2.
  41                  *
  42                  * We may also have been called directly from dfrn_request ($handsfree != null) due to
  43                  * this being a page type which supports automatic friend acceptance. That is also Scenario 1
  44                  * since we are operating on behalf of our registered user to approve a friendship.
  45                  *
  46                  */
  47
  48         if(! x($_POST,'source_url')) {
  49
  50                 $uid = ((is_array($handsfree)) ? $handsfree['uid'] : local_user());
  51
  52                 if(! $uid) {
  53                         notice( t('Permission denied.') . EOL );
  54                         return;
  55                 }
  56
  57                 $user = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
  58                         intval($uid)
  59                 );
  60
  61                 if(! $user) {
  62                         notice( t('Profile not found.') . EOL );
  63                         return;
  64                 }
  65
  66
  67                 // These data elements may come from either the friend request notification form or $handsfree array.
  68
  69                 if(is_array($handsfree)) {
  70                         logger('dfrn_confirm: Confirm in handsfree mode');
  71                         $dfrn_id   = $handsfree['dfrn_id'];
  72                         $intro_id  = $handsfree['intro_id'];
  73                         $duplex    = $handsfree['duplex'];
  74                 }
  75                 else {
  76                         $dfrn_id  = ((x($_POST,'dfrn_id'))    ? notags(trim($_POST['dfrn_id'])) : "");
  77                         $intro_id = ((x($_POST,'intro_id'))   ? intval($_POST['intro_id'])      : 0 );
  78                         $duplex   = ((x($_POST,'duplex'))     ? intval($_POST['duplex'])        : 0 );
  79                         $cid      = ((x($_POST,'contact_id')) ? intval($_POST['contact_id'])    : 0 );
  80                 }
  81
  82                 /**
  83                  *
  84                  * Ensure that dfrn_id has precedence when we go to find the contact record.
  85                  * We only want to search based on contact id if there is no dfrn_id,
  86                  * e.g. for OStatus network followers.
  87                  *
  88                  */
  89
  90                 if(strlen($dfrn_id))
  91                         $cid = 0;
  92
  93                 logger('dfrn_confirm: Confirming request for dfrn_id (issued) ' . $dfrn_id);
  94                 if($cid)
  95                         logger('dfrn_confirm: Confirming follower with contact_id: ' . $cid);
  96
  97
  98                 /**
  99                  *
 100                  * The other person will have been issued an ID when they first requested friendship.
 101                  * Locate their record. At this time, their record will have both pending and blocked set to 1.
 102                  * There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
 103                  *
 104                  */
 105
 106                 $r = q("SELECT * FROM `contact` WHERE ( ( `issued-id` != '' AND `issued-id` = '%s' ) OR ( `id` = %d AND `id` != 0 ) ) AND `uid` = %d LIMIT 1",
 107                         dbesc($dfrn_id),
 108                         intval($cid),
 109                         intval($uid)
 110                 );
 111
 112                 if(! count($r)) {
 113                         logger('dfrn_confirm: Contact not found in DB.');
 114                         notice( t('Contact not found.') . EOL );
 115                         return;
 116                 }
 117
 118                 $contact = $r[0];
 119
 120                 $contact_id   = $contact['id'];
 121                 $relation     = $contact['rel'];
 122                 $site_pubkey  = $contact['site-pubkey'];
 123                 $dfrn_confirm = $contact['confirm'];
 124                 $aes_allow    = $contact['aes_allow'];
 125
 126                 $network = ((strlen($contact['issued-id'])) ? 'dfrn' : 'stat');
 127
 128                 if($network === 'dfrn') {
 129
 130                         /**
 131                          *
 132                          * Generate a key pair for all further communications with this person.
 133                          * We have a keypair for every contact, and a site key for unknown people.
 134                          * This provides a means to carry on relationships with other people if
 135                          * any single key is compromised. It is a robust key. We're much more
 136                          * worried about key leakage than anybody cracking it.
 137                          *
 138                          */
 139
 140                         $res = openssl_pkey_new(array(
 141                                 'digest_alg' => 'sha1',
 142                                 'private_key_bits' => 4096,
 143                                 'encrypt_key' => false )
 144                         );
 145
 146                         $private_key = '';
 147
 148                         openssl_pkey_export($res, $private_key);
 149
 150                         $pubkey = openssl_pkey_get_details($res);
 151                         $public_key = $pubkey["key"];
 152
 153                         // Save the private key. Send them the public key.
 154
 155                         $r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
 156                                 dbesc($private_key),
 157                                 intval($contact_id),
 158                                 intval($uid)
 159                         );
 160
 161                         $params = array();
 162
 163                         /**
 164                          *
 165                          * Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our
 166                          * site private key (person on the other end can decrypt it with our site public key).
 167                          * Then encrypt our profile URL with the other person's site public key. They can decrypt
 168                          * it with their site private key. If the decryption on the other end fails for either
 169                          * item, it indicates tampering or key failure on at least one site and we will not be
 170                          * able to provide a secure communication pathway.
 171                          *
 172                          * If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
 173                          * or later) then we encrypt the personal public key we send them using AES-256-CBC and a
 174                          * random key which is encrypted with their site public key.
 175                          *
 176                          */
 177
 178                         $src_aes_key = random_string();
 179
 180                         $result = '';
 181                         openssl_private_encrypt($dfrn_id,$result,$user[0]['prvkey']);
 182
 183                         $params['dfrn_id'] = bin2hex($result);
 184                         $params['public_key'] = $public_key;
 185
 186
 187                         $my_url = $a->get_baseurl() . '/profile/' . $user[0]['nickname'];
 188
 189                         openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
 190                         $params['source_url'] = bin2hex($params['source_url']);
 191
 192                         if($aes_allow && function_exists('openssl_encrypt')) {
 193                                 openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
 194                                 $params['aes_key'] = bin2hex($params['aes_key']);
 195                                 $params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
 196                         }
 197
 198                         $params['dfrn_version'] = DFRN_PROTOCOL_VERSION ;
 199                         if($duplex == 1)
 200                                 $params['duplex'] = 1;
 201
 202                         logger('dfrn_confirm: Confirm: posting data to ' . $dfrn_confirm . ': ' . print_r($params,true), LOGGER_DATA);
 203
 204                         // POST all this stuff to the other site.
 205
 206                         $res = post_url($dfrn_confirm,$params);
 207
 208                         logger('dfrn_confirm: Confirm: received data: ' . $res, LOGGER_DATA);
 209
 210                         // Now figure out what they responded. Try to be robust if the remote site is
 211                         // having difficulty and throwing up errors of some kind.
 212
 213                         $leading_junk = substr($res,0,strpos($res,'<?xml'));
 214
 215                         $res = substr($res,strpos($res,'<?xml'));
 216                         if(! strlen($res)) {
 217
 218                                         // No XML at all, this exchange is messed up really bad.
 219                                         // We shouldn't proceed, because the xml parser might choke,
 220                                         // and $status is going to be zero, which indicates success.
 221                                         // We can hardly call this a success.
 222
 223                                 notice( t('Response from remote site was not understood.') . EOL);
 224                                 return;
 225                         }
 226
 227                         if(strlen($leading_junk) && get_config('system','debugging')) {
 228
 229                                         // This might be more common. Mixed error text and some XML.
 230                                         // If we're configured for debugging, show the text. Proceed in either case.
 231
 232                                 notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
 233                         }
 234
 235                         $xml = simplexml_load_string($res);
 236                         $status = (int) $xml->status;
 237                         $message = unxmlify($xml->message);   // human readable text of what may have gone wrong.
 238                         switch($status) {
 239                                 case 0:
 240                                         notice( t("Confirmation completed successfully.") . EOL);
 241                                         if(strlen($message))
 242                                                 notice( t('Remote site reported: ') . $message . EOL);
 243                                         break;
 244                                 case 1:
 245                                         // birthday paradox - generate new dfrn-id and fall through.
 246                                         $new_dfrn_id = random_string();
 247                                         $r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
 248                                                 dbesc($new_dfrn_id),
 249                                                 intval($contact_id),
 250                                                 intval($uid)
 251                                         );
 252
 253                                 case 2:
 254                                         notice( t("Temporary failure. Please wait and try again.") . EOL);
 255                                         if(strlen($message))
 256                                                 notice( t('Remote site reported: ') . $message . EOL);
 257                                         break;
 258
 259
 260                                 case 3:
 261                                         notice( t("Introduction failed or was revoked.") . EOL);
 262                                         if(strlen($message))
 263                                                 notice( t('Remote site reported: ') . $message . EOL);
 264                                         break;
 265                                 }
 266
 267                         if(($status == 0) && ($intro_id)) {
 268
 269                                 // Success. Delete the notification.
 270
 271                                 $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 272                                         intval($intro_id),
 273                                         intval($uid)
 274                                 );
 275
 276                         }
 277
 278                         if($status != 0)
 279                                 return;
 280                 }
 281
 282
 283                 /*
 284                  *
 285                  * We have now established a relationship with the other site.
 286                  * Let's make our own personal copy of their profile photo so we don't have
 287                  * to always load it from their site.
 288                  *
 289                  * We will also update the contact record with the nature and scope of the relationship.
 290                  *
 291                  */
 292
 293                 require_once("Photo.php");
 294
 295                 $photos = import_profile_photo($contact['photo'],$uid,$contact_id);
 296
 297                 logger('dfrn_confirm: confirm - imported photos');
 298
 299                 if($network === 'dfrn') {
 300
 301                         $new_relation = REL_VIP;
 302                         if(($relation == REL_FAN) || ($duplex))
 303                                 $new_relation = REL_BUD;
 304
 305                         if(($relation == REL_FAN) && ($duplex))
 306                                 $duplex = 0;
 307
 308                         $r = q("UPDATE `contact` SET `photo` = '%s',
 309                                 `thumb` = '%s',
 310                                 `micro` = '%s',
 311                                 `rel` = %d,
 312                                 `name-date` = '%s',
 313                                 `uri-date` = '%s',
 314                                 `avatar-date` = '%s',
 315                                 `blocked` = 0,
 316                                 `pending` = 0,
 317                                 `duplex` = %d,
 318                                 `network` = 'dfrn' WHERE `id` = %d LIMIT 1
 319                         ",
 320                                 dbesc($photos[0]),
 321                                 dbesc($photos[1]),
 322                                 dbesc($photos[2]),
 323                                 intval($new_relation),
 324                                 dbesc(datetime_convert()),
 325                                 dbesc(datetime_convert()),
 326                                 dbesc(datetime_convert()),
 327                                 intval($duplex),
 328                                 intval($contact_id)
 329                         );
 330                 }
 331                 else {
 332                         // $network !== 'dfrn'
 333
 334                         $notify = '';
 335                         $poll   = '';
 336
 337                         $arr = lrdd($contact['url']);
 338                         if(count($arr)) {
 339                                 foreach($arr as $link) {
 340                                         if($link['@attributes']['rel'] === 'salmon')
 341                                                 $notify = $link['@attributes']['href'];
 342                                         if($link['@attributes']['rel'] === NAMESPACE_FEED)
 343                                                 $poll = $link['@attributes']['href'];
 344                                 }
 345                         }
 346
 347                         $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
 348                                 intval($intro_id),
 349                                 intval($uid)
 350                         );
 351
 352
 353                         $r = q("UPDATE `contact` SET `photo` = '%s',
 354                                 `thumb` = '%s',
 355                                 `micro` = '%s',
 356                                 `name-date` = '%s',
 357                                 `uri-date` = '%s',
 358                                 `avatar-date` = '%s',
 359                                 `notify` = '%s',
 360                                 `poll` = '%s',
 361                                 `blocked` = 0,
 362                                 `pending` = 0,
 363                                 `network` = 'stat'
 364                                 WHERE `id` = %d LIMIT 1
 365                         ",
 366                                 dbesc($photos[0]),
 367                                 dbesc($photos[1]),
 368                                 dbesc($photos[2]),
 369                                 dbesc(datetime_convert()),
 370                                 dbesc(datetime_convert()),
 371                                 dbesc(datetime_convert()),
 372                                 dbesc($notify),
 373                                 dbesc($poll),
 374                                 intval($contact_id)
 375                         );
 376                 }
 377
 378                 if($r === false)
 379                                 notice( t('Unable to set contact photo.') . EOL);
 380
 381
 382                 // Let's send our user to the contact editor in case they want to
 383                 // do anything special with this new friend.
 384
 385                 if($handsfree === null)
 386                         goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
 387                 else
 388                         return;
 389                 //NOTREACHED
 390         }
 391
 392         /**
 393          *
 394          *
 395          * End of Scenario 1. [Local confirmation of remote friend request].
 396          *
 397          * Begin Scenario 2. This is the remote response to the above scenario.
 398          * This will take place on the site that originally initiated the friend request.
 399          * In the section above where the confirming party makes a POST and
 400          * retrieves xml status information, they are communicating with the following code.
 401          *
 402          */
 403
 404         if(x($_POST,'source_url')) {
 405
 406                 // We are processing an external confirmation to an introduction created by our user.
 407
 408                 $public_key = ((x($_POST,'public_key'))   ? $_POST['public_key']           : '');
 409                 $dfrn_id    = ((x($_POST,'dfrn_id'))      ? hex2bin($_POST['dfrn_id'])     : '');
 410                 $source_url = ((x($_POST,'source_url'))   ? hex2bin($_POST['source_url'])  : '');
 411                 $aes_key    = ((x($_POST,'aes_key'))      ? $_POST['aes_key']              : '');
 412                 $duplex     = ((x($_POST,'duplex'))       ? intval($_POST['duplex'])       : 0 );
 413                 $version_id = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
 414
 415                 logger('dfrn_confirm: requestee contacted: ' . $node);
 416
 417                 logger('dfrn_confirm: request: POST=' . print_r($_POST,true), LOGGER_DATA);
 418
 419                 // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
 420
 421                 if(x($aes_key)) {
 422                         $aes_key = hex2bin($aes_key);
 423                         $public_key = hex2bin($public_key);
 424                 }
 425
 426                 // Find our user's account
 427
 428                 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
 429                         dbesc($node));
 430
 431                 if(! count($r)) {
 432                         $message = t('No user record found for ') . '\'' . $node . '\'';
 433                         xml_status(3,$message); // failure
 434                         // NOTREACHED
 435                 }
 436
 437                 $my_prvkey = $r[0]['prvkey'];
 438                 $local_uid = $r[0]['uid'];
 439
 440
 441                 if(! strstr($my_prvkey,'BEGIN RSA PRIVATE KEY')) {
 442                         $message = t('Our site encryption key is apparently messed up.');
 443                         xml_status(3,$message);
 444                 }
 445
 446                 // verify everything
 447
 448                 $decrypted_source_url = "";
 449                 openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey);
 450
 451
 452                 if(! strlen($decrypted_source_url)) {
 453                         $message = t('Empty site URL was provided or URL could not be decrypted by us.');
 454                         xml_status(3,$message);
 455                         // NOTREACHED
 456                 }
 457
 458                 $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
 459                         dbesc($decrypted_source_url),
 460                         intval($local_uid)
 461                 );
 462
 463                 if(! count($ret)) {
 464                         // this is either a bogus confirmation (?) or we deleted the original introduction.
 465                         $message = t('Contact record was not found for you on our site.');
 466                         xml_status(3,$message);
 467                         return; // NOTREACHED
 468                 }
 469
 470                 $relation = $ret[0]['rel'];
 471
 472                 // Decrypt all this stuff we just received
 473
 474                 $foreign_pubkey = $ret[0]['site-pubkey'];
 475                 $dfrn_record    = $ret[0]['id'];
 476
 477                 $decrypted_dfrn_id = "";
 478                 openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey);
 479
 480                 if(strlen($aes_key)) {
 481                         $decrypted_aes_key = "";
 482                         openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey);
 483                         $dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key);
 484                 }
 485                 else {
 486                         $dfrn_pubkey = $public_key;
 487                 }
 488
 489                 $r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1",
 490                         dbesc($decrypted_dfrn_id)
 491                 );
 492                 if(count($r)) {
 493                         $message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
 494                         xml_status(1,$message); // Birthday paradox - duplicate dfrn-id
 495                         // NOTREACHED
 496                 }
 497
 498                 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d LIMIT 1",
 499                         dbesc($decrypted_dfrn_id),
 500                         dbesc($dfrn_pubkey),
 501                         intval($dfrn_record)
 502                 );
 503                 if(! count($r)) {
 504                         $message = t('Unable to set your contact credentials on our system.');
 505                         xml_status(3,$message);
 506                 }
 507
 508                 // We're good but now we have to scrape the profile photo and send notifications.
 509
 510
 511
 512                 $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
 513                         intval($dfrn_record));
 514
 515                 if(count($r))
 516                         $photo = $r[0]['photo'];
 517                 else
 518                         $photo = $a->get_baseurl() . '/images/default-profile.jpg';
 519
 520                 require_once("Photo.php");
 521
 522                 $photos = import_profile_photo($photo,$local_uid,$dfrn_record);
 523
 524                 logger('dfrn_confirm: request - photos imported');
 525
 526                 $new_relation = REL_FAN;
 527                 if(($relation == REL_VIP) || ($duplex))
 528                         $new_relation = REL_BUD;
 529
 530                 if(($relation == REL_VIP) && ($duplex))
 531                         $duplex = 0;
 532
 533                 $r = q("UPDATE `contact` SET
 534                         `photo` = '%s',
 535                         `thumb` = '%s',
 536                         `micro` = '%s',
 537                         `rel` = %d,
 538                         `name-date` = '%s',
 539                         `uri-date` = '%s',
 540                         `avatar-date` = '%s',
 541                         `blocked` = 0,
 542                         `pending` = 0,
 543                         `duplex` = %d,
 544                         `network` = 'dfrn' WHERE `id` = %d LIMIT 1
 545                 ",
 546                         dbesc($photos[0]),
 547                         dbesc($photos[1]),
 548                         dbesc($photos[2]),
 549                         intval($new_relation),
 550                         dbesc(datetime_convert()),
 551                         dbesc(datetime_convert()),
 552                         dbesc(datetime_convert()),
 553                         intval($duplex),
 554                         intval($dfrn_record)
 555                 );
 556                 if($r === false) {    // indicates schema is messed up or total db failure
 557                         $message = t('Unable to update your contact profile details on our system');
 558                         xml_status(3,$message);
 559                 }
 560
 561                 // Otherwise everything seems to have worked and we are almost done. Yay!
 562                 // Send an email notification
 563
 564                 logger('dfrn_confirm: request: info updated');
 565
 566                 $r = q("SELECT * FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
 567                         WHERE `contact`.`id` = %d LIMIT 1",
 568                         intval($dfrn_record)
 569                 );
 570                 if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {
 571
 572                         $tpl = (($new_relation == REL_BUD)
 573                                 ? load_view_file('view/friend_complete_eml.tpl')
 574                                 : load_view_file('view/intro_complete_eml.tpl'));
 575
 576                         $email_tpl = replace_macros($tpl, array(
 577                                 '$sitename' => $a->config['sitename'],
 578                                 '$siteurl' =>  $a->get_baseurl(),
 579                                 '$username' => $r[0]['username'],
 580                                 '$email' => $r[0]['email'],
 581                                 '$fn' => $r[0]['name'],
 582                                 '$dfrn_url' => $r[0]['url'],
 583                                 '$uid' => $newuid )
 584                         );
 585
 586                         $res = mail($r[0]['email'], t("Connection accepted at ") . $a->config['sitename'],
 587                                 $email_tpl, 'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] );
 588                         if(!$res) {
 589                                 // pointless throwing an error here and confusing the person at the other end of the wire.
 590                         }
 591                 }
 592                 xml_status(0); // Success
 593                 return; // NOTREACHED
 594
 595                         ////////////////////// End of this scenario ///////////////////////////////////////////////
 596         }
 597
 598         // somebody arrived here by mistake or they are fishing. Send them to the homepage.
 599
 600         goaway($a->get_baseurl());
 601         // NOTREACHED
 602
 603 }