5 * Purpose: Friendship acceptance for DFRN contacts
7 * There are two possible entry points and three scenarios.
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.
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.
17 function dfrn_confirm_post(&$a,$handsfree = null) {
19 if(is_array($handsfree)) {
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.
27 $node = $handsfree['node'];
28 $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
38 * Main entry point. Scenario 1. Our user received a friend request notification (perhaps
39 * from another site) and clicked 'Approve'.
40 * $POST['source_url'] is not set. If it is, it indicates Scenario 2.
42 * We may also have been called directly from dfrn_request ($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.
48 if(! x($_POST,'source_url')) {
50 $uid = ((is_array($handsfree)) ? $handsfree['uid'] : local_user());
53 notice( t('Permission denied.') . EOL );
57 $user = q("SELECT * FROM `user` WHERE `uid` = %d LIMIT 1",
62 notice( t('Profile not found.') . EOL );
67 // These data elements may come from either the friend request notification form or $handsfree array.
69 if(is_array($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 $hidden = ((array_key_exists('hidden',$handsfree)) ? intval($handsfree['hidden']) : 0 );
77 $dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : "");
78 $intro_id = ((x($_POST,'intro_id')) ? intval($_POST['intro_id']) : 0 );
79 $duplex = ((x($_POST,'duplex')) ? intval($_POST['duplex']) : 0 );
80 $cid = ((x($_POST,'contact_id')) ? intval($_POST['contact_id']) : 0 );
81 $hidden = ((x($_POST,'hidden')) ? intval($_POST['hidden']) : 0 );
86 * Ensure that dfrn_id has precedence when we go to find the contact record.
87 * We only want to search based on contact id if there is no dfrn_id,
88 * e.g. for OStatus network followers.
95 logger('dfrn_confirm: Confirming request for dfrn_id (issued) ' . $dfrn_id);
97 logger('dfrn_confirm: Confirming follower with contact_id: ' . $cid);
102 * The other person will have been issued an ID when they first requested friendship.
103 * Locate their record. At this time, their record will have both pending and blocked set to 1.
104 * There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
108 $r = q("SELECT * FROM `contact` WHERE ( ( `issued-id` != '' AND `issued-id` = '%s' ) OR ( `id` = %d AND `id` != 0 ) ) AND `uid` = %d LIMIT 1",
115 logger('dfrn_confirm: Contact not found in DB.');
116 notice( t('Contact not found.') . EOL );
122 $contact_id = $contact['id'];
123 $relation = $contact['rel'];
124 $site_pubkey = $contact['site-pubkey'];
125 $dfrn_confirm = $contact['confirm'];
126 $aes_allow = $contact['aes_allow'];
128 $network = ((strlen($contact['issued-id'])) ? NETWORK_DFRN : NETWORK_OSTATUS);
130 if($contact['network'])
131 $network = $contact['network'];
133 if($network === NETWORK_DFRN) {
137 * Generate a key pair for all further communications with this person.
138 * We have a keypair for every contact, and a site key for unknown people.
139 * This provides a means to carry on relationships with other people if
140 * any single key is compromised. It is a robust key. We're much more
141 * worried about key leakage than anybody cracking it.
145 $res = openssl_pkey_new(array(
146 'digest_alg' => 'sha1',
147 'private_key_bits' => 4096,
148 'encrypt_key' => false )
153 openssl_pkey_export($res, $private_key);
155 $pubkey = openssl_pkey_get_details($res);
156 $public_key = $pubkey["key"];
158 // Save the private key. Send them the public key.
160 $r = q("UPDATE `contact` SET `prvkey` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
170 * Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our
171 * site private key (person on the other end can decrypt it with our site public key).
172 * Then encrypt our profile URL with the other person's site public key. They can decrypt
173 * it with their site private key. If the decryption on the other end fails for either
174 * item, it indicates tampering or key failure on at least one site and we will not be
175 * able to provide a secure communication pathway.
177 * If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
178 * or later) then we encrypt the personal public key we send them using AES-256-CBC and a
179 * random key which is encrypted with their site public key.
183 $src_aes_key = random_string();
186 openssl_private_encrypt($dfrn_id,$result,$user[0]['prvkey']);
188 $params['dfrn_id'] = bin2hex($result);
189 $params['public_key'] = $public_key;
192 $my_url = $a->get_baseurl() . '/profile/' . $user[0]['nickname'];
194 openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
195 $params['source_url'] = bin2hex($params['source_url']);
197 if($aes_allow && function_exists('openssl_encrypt')) {
198 openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
199 $params['aes_key'] = bin2hex($params['aes_key']);
200 $params['public_key'] = bin2hex(openssl_encrypt($public_key,'AES-256-CBC',$src_aes_key));
203 $params['dfrn_version'] = DFRN_PROTOCOL_VERSION ;
205 $params['duplex'] = 1;
207 logger('dfrn_confirm: Confirm: posting data to ' . $dfrn_confirm . ': ' . print_r($params,true), LOGGER_DATA);
211 * POST all this stuff to the other site.
212 * Temporarily raise the network timeout to 120 seconds because the default 60
213 * doesn't always give the other side quite enough time to decrypt everything.
217 $a->config['system']['curl_timeout'] = 120;
219 $res = post_url($dfrn_confirm,$params);
221 logger('dfrn_confirm: Confirm: received data: ' . $res, LOGGER_DATA);
223 // Now figure out what they responded. Try to be robust if the remote site is
224 // having difficulty and throwing up errors of some kind.
226 $leading_junk = substr($res,0,strpos($res,'<?xml'));
228 $res = substr($res,strpos($res,'<?xml'));
231 // No XML at all, this exchange is messed up really bad.
232 // We shouldn't proceed, because the xml parser might choke,
233 // and $status is going to be zero, which indicates success.
234 // We can hardly call this a success.
236 notice( t('Response from remote site was not understood.') . EOL);
240 if(strlen($leading_junk) && get_config('system','debugging')) {
242 // This might be more common. Mixed error text and some XML.
243 // If we're configured for debugging, show the text. Proceed in either case.
245 notice( t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL );
248 $xml = parse_xml_string($res);
249 $status = (int) $xml->status;
250 $message = unxmlify($xml->message); // human readable text of what may have gone wrong.
253 notice( t("Confirmation completed successfully.") . EOL);
255 notice( t('Remote site reported: ') . $message . EOL);
258 // birthday paradox - generate new dfrn-id and fall through.
259 $new_dfrn_id = random_string();
260 $r = q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d LIMIT 1",
267 notice( t("Temporary failure. Please wait and try again.") . EOL);
269 notice( t('Remote site reported: ') . $message . EOL);
274 notice( t("Introduction failed or was revoked.") . EOL);
276 notice( t('Remote site reported: ') . $message . EOL);
280 if(($status == 0) && ($intro_id)) {
282 // Success. Delete the notification.
284 $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
298 * We have now established a relationship with the other site.
299 * Let's make our own personal copy of their profile photo so we don't have
300 * to always load it from their site.
302 * We will also update the contact record with the nature and scope of the relationship.
306 require_once('include/Photo.php');
308 $photos = import_profile_photo($contact['photo'],$uid,$contact_id);
310 logger('dfrn_confirm: confirm - imported photos');
312 if($network === NETWORK_DFRN) {
314 $new_relation = CONTACT_IS_FOLLOWER;
315 if(($relation == CONTACT_IS_SHARING) || ($duplex))
316 $new_relation = CONTACT_IS_FRIEND;
318 if(($relation == CONTACT_IS_SHARING) && ($duplex))
321 $r = q("UPDATE `contact` SET
328 `avatar-date` = '%s',
333 `network` = 'dfrn' WHERE `id` = %d LIMIT 1
338 intval($new_relation),
339 dbesc(datetime_convert()),
340 dbesc(datetime_convert()),
341 dbesc(datetime_convert()),
349 // $network !== NETWORK_DFRN
351 $network = (($contact['network']) ? $contact['network'] : NETWORK_OSTATUS);
352 $notify = (($contact['notify']) ? $contact['notify'] : '');
353 $poll = (($contact['poll']) ? $contact['poll'] : '');
355 if((! $contact['notify']) || (! $contact['poll'])) {
356 $arr = lrdd($contact['url']);
358 foreach($arr as $link) {
359 if($link['@attributes']['rel'] === 'salmon')
360 $notify = $link['@attributes']['href'];
361 if($link['@attributes']['rel'] === NAMESPACE_FEED)
362 $poll = $link['@attributes']['href'];
367 $new_relation = $contact['rel'];
368 $writable = $contact['writable'];
370 if($network === NETWORK_DIASPORA) {
372 $new_relation = CONTACT_IS_FRIEND;
374 $new_relation = CONTACT_IS_SHARING;
376 if($new_relation != CONTACT_IS_FOLLOWER)
380 $r = q("DELETE FROM `intro` WHERE `id` = %d AND `uid` = %d LIMIT 1",
386 $r = q("UPDATE `contact` SET `photo` = '%s',
391 `avatar-date` = '%s',
400 WHERE `id` = %d LIMIT 1
405 dbesc(datetime_convert()),
406 dbesc(datetime_convert()),
407 dbesc(datetime_convert()),
413 intval($new_relation),
419 notice( t('Unable to set contact photo.') . EOL);
421 // reload contact info
423 $r = q("SELECT * FROM `contact` WHERE `id` = %d LIMIT 1",
431 // Send a new friend post if we are allowed to...
433 $r = q("SELECT `hide-friends` FROM `profile` WHERE `uid` = %d AND `is-default` = 1 LIMIT 1",
436 if((count($r)) && (! $hidden) && ($r[0]['hide-friends'] == 0) && (is_array($contact)) && isset($new_relation) && ($new_relation == CONTACT_IS_FRIEND)) {
438 if($r[0]['network'] === NETWORK_DIASPORA) {
439 require_once('include/diaspora.php');
440 $ret = diaspora_share($user[0],$r[0]);
441 logger('mod_follow: diaspora_share returns: ' . $ret);
444 require_once('include/items.php');
446 $self = q("SELECT * FROM `contact` WHERE `self` = 1 AND `uid` = %d LIMIT 1",
453 $arr['uri'] = $arr['parent-uri'] = item_new_uri($a->get_hostname(), $uid);
455 $arr['contact-id'] = $self[0]['id'];
457 $arr['type'] = 'wall';
460 $arr['author-name'] = $arr['owner-name'] = $self[0]['name'];
461 $arr['author-link'] = $arr['owner-link'] = $self[0]['url'];
462 $arr['author-avatar'] = $arr['owner-avatar'] = $self[0]['thumb'];
463 $arr['verb'] = ACTIVITY_FRIEND;
464 $arr['object-type'] = ACTIVITY_OBJ_PERSON;
466 $A = '[url=' . $self[0]['url'] . ']' . $self[0]['name'] . '[/url]';
467 $B = '[url=' . $contact['url'] . ']' . $contact['name'] . '[/url]';
468 $BPhoto = '[url=' . $contact['url'] . ']' . '[img]' . $contact['thumb'] . '[/img][/url]';
469 $arr['body'] = sprintf( t('%1$s is now friends with %2$s'), $A, $B)."\n\n\n".$BPhoto;
471 $arr['object'] = '<object><type>' . ACTIVITY_OBJ_PERSON . '</type><title>' . $contact['name'] . '</title>'
472 . '<id>' . $contact['url'] . '/' . $contact['name'] . '</id>';
473 $arr['object'] .= '<link>' . xmlify('<link rel="alternate" type="text/html" href="' . $contact['url'] . '" />' . "\n");
474 $arr['object'] .= xmlify('<link rel="photo" type="image/jpeg" href="' . $contact['thumb'] . '" />' . "\n");
475 $arr['object'] .= '</link></object>' . "\n";
476 $arr['last-child'] = 1;
478 $arr['allow_cid'] = $user[0]['allow_cid'];
479 $arr['allow_gid'] = $user[0]['allow_gid'];
480 $arr['deny_cid'] = $user[0]['deny_cid'];
481 $arr['deny_gid'] = $user[0]['deny_gid'];
483 $i = item_store($arr);
485 proc_run('php',"include/notifier.php","activity","$i");
490 // Let's send our user to the contact editor in case they want to
491 // do anything special with this new friend.
493 if($handsfree === null)
494 goaway($a->get_baseurl() . '/contacts/' . intval($contact_id));
503 * End of Scenario 1. [Local confirmation of remote friend request].
505 * Begin Scenario 2. This is the remote response to the above scenario.
506 * This will take place on the site that originally initiated the friend request.
507 * In the section above where the confirming party makes a POST and
508 * retrieves xml status information, they are communicating with the following code.
512 if(x($_POST,'source_url')) {
514 // We are processing an external confirmation to an introduction created by our user.
516 $public_key = ((x($_POST,'public_key')) ? $_POST['public_key'] : '');
517 $dfrn_id = ((x($_POST,'dfrn_id')) ? hex2bin($_POST['dfrn_id']) : '');
518 $source_url = ((x($_POST,'source_url')) ? hex2bin($_POST['source_url']) : '');
519 $aes_key = ((x($_POST,'aes_key')) ? $_POST['aes_key'] : '');
520 $duplex = ((x($_POST,'duplex')) ? intval($_POST['duplex']) : 0 );
521 $version_id = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
523 logger('dfrn_confirm: requestee contacted: ' . $node);
525 logger('dfrn_confirm: request: POST=' . print_r($_POST,true), LOGGER_DATA);
527 // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
530 $aes_key = hex2bin($aes_key);
531 $public_key = hex2bin($public_key);
534 // Find our user's account
536 $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
540 $message = sprintf(t('No user record found for \'%s\' '), $node);
541 xml_status(3,$message); // failure
545 $my_prvkey = $r[0]['prvkey'];
546 $local_uid = $r[0]['uid'];
549 if(! strstr($my_prvkey,'PRIVATE KEY')) {
550 $message = t('Our site encryption key is apparently messed up.');
551 xml_status(3,$message);
556 $decrypted_source_url = "";
557 openssl_private_decrypt($source_url,$decrypted_source_url,$my_prvkey);
560 if(! strlen($decrypted_source_url)) {
561 $message = t('Empty site URL was provided or URL could not be decrypted by us.');
562 xml_status(3,$message);
566 $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
567 dbesc($decrypted_source_url),
571 if(strstr($decrypted_source_url,'http:'))
572 $newurl = str_replace('http:','https:',$decrypted_source_url);
574 $newurl = str_replace('https:','http:',$decrypted_source_url);
576 $ret = q("SELECT * FROM `contact` WHERE `url` = '%s' AND `uid` = %d LIMIT 1",
581 // this is either a bogus confirmation (?) or we deleted the original introduction.
582 $message = t('Contact record was not found for you on our site.');
583 xml_status(3,$message);
584 return; // NOTREACHED
588 $relation = $ret[0]['rel'];
590 // Decrypt all this stuff we just received
592 $foreign_pubkey = $ret[0]['site-pubkey'];
593 $dfrn_record = $ret[0]['id'];
595 if(! $foreign_pubkey) {
596 $message = sprintf( t('Site public key not available in contact record for URL %s.'), $newurl);
597 xml_status(3,$message);
600 $decrypted_dfrn_id = "";
601 openssl_public_decrypt($dfrn_id,$decrypted_dfrn_id,$foreign_pubkey);
603 if(strlen($aes_key)) {
604 $decrypted_aes_key = "";
605 openssl_private_decrypt($aes_key,$decrypted_aes_key,$my_prvkey);
606 $dfrn_pubkey = openssl_decrypt($public_key,'AES-256-CBC',$decrypted_aes_key);
609 $dfrn_pubkey = $public_key;
612 $r = q("SELECT * FROM `contact` WHERE `dfrn-id` = '%s' LIMIT 1",
613 dbesc($decrypted_dfrn_id)
616 $message = t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
617 xml_status(1,$message); // Birthday paradox - duplicate dfrn-id
621 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d LIMIT 1",
622 dbesc($decrypted_dfrn_id),
627 $message = t('Unable to set your contact credentials on our system.');
628 xml_status(3,$message);
631 // We're good but now we have to scrape the profile photo and send notifications.
635 $r = q("SELECT `photo` FROM `contact` WHERE `id` = %d LIMIT 1",
636 intval($dfrn_record));
639 $photo = $r[0]['photo'];
641 $photo = $a->get_baseurl() . '/images/default-profile.jpg';
643 require_once("Photo.php");
645 $photos = import_profile_photo($photo,$local_uid,$dfrn_record);
647 logger('dfrn_confirm: request - photos imported');
649 $new_relation = CONTACT_IS_SHARING;
650 if(($relation == CONTACT_IS_FOLLOWER) || ($duplex))
651 $new_relation = CONTACT_IS_FRIEND;
653 if(($relation == CONTACT_IS_FOLLOWER) && ($duplex))
656 $r = q("UPDATE `contact` SET
663 `avatar-date` = '%s',
667 `network` = '%s' WHERE `id` = %d LIMIT 1
672 intval($new_relation),
673 dbesc(datetime_convert()),
674 dbesc(datetime_convert()),
675 dbesc(datetime_convert()),
680 if($r === false) { // indicates schema is messed up or total db failure
681 $message = t('Unable to update your contact profile details on our system');
682 xml_status(3,$message);
685 // Otherwise everything seems to have worked and we are almost done. Yay!
686 // Send an email notification
688 logger('dfrn_confirm: request: info updated');
690 $r = q("SELECT `contact`.*, `user`.* FROM `contact` LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
691 WHERE `contact`.`id` = %d LIMIT 1",
694 if((count($r)) && ($r[0]['notify-flags'] & NOTIFY_CONFIRM)) {
696 push_lang($r[0]['language']);
697 $tpl = (($new_relation == CONTACT_IS_FRIEND)
698 ? get_intltext_template('friend_complete_eml.tpl')
699 : get_intltext_template('intro_complete_eml.tpl'));
701 $email_tpl = replace_macros($tpl, array(
702 '$sitename' => $a->config['sitename'],
703 '$siteurl' => $a->get_baseurl(),
704 '$username' => $r[0]['username'],
705 '$email' => $r[0]['email'],
706 '$fn' => $r[0]['name'],
707 '$dfrn_url' => $r[0]['url'],
711 $res = mail($r[0]['email'], sprintf( t("Connection accepted at %s") , $a->config['sitename']),
713 'From: ' . t('Administrator') . '@' . $_SERVER['SERVER_NAME'] . "\n"
714 . 'Content-type: text/plain; charset=UTF-8' . "\n"
715 . 'Content-transfer-encoding: 8bit' );
718 // pointless throwing an error here and confusing the person at the other end of the wire.
722 xml_status(0); // Success
723 return; // NOTREACHED
725 ////////////////////// End of this scenario ///////////////////////////////////////////////
728 // somebody arrived here by mistake or they are fishing. Send them to the homepage.