3 * @file mod/dfrn_confirm.php
4 * @brief Module: dfrn_confirm
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.
15 * @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
16 * You also find a graphic which describes the confirmation process at
17 * https://github.com/friendica/friendica/blob/master/spec/dfrn2_contact_confirmation.png
21 use Friendica\Core\Config;
22 use Friendica\Core\L10n;
23 use Friendica\Core\Logger;
24 use Friendica\Core\Protocol;
25 use Friendica\Core\System;
26 use Friendica\Database\DBA;
27 use Friendica\Model\Contact;
28 use Friendica\Model\Group;
29 use Friendica\Model\User;
30 use Friendica\Network\Probe;
31 use Friendica\Protocol\Diaspora;
32 use Friendica\Protocol\ActivityPub;
33 use Friendica\Util\Crypto;
34 use Friendica\Util\DateTimeFormat;
35 use Friendica\Util\Network;
36 use Friendica\Util\Strings;
37 use Friendica\Util\XML;
39 function dfrn_confirm_post(App $a, $handsfree = null)
42 if (is_array($handsfree)) {
44 * We were called directly from dfrn_request due to automatic friend acceptance.
45 * Any $_POST parameters we may require are supplied in the $handsfree array.
48 $node = $handsfree['node'];
49 $a->interactive = false; // notice() becomes a no-op since nobody is there to see it
50 } elseif ($a->argc > 1) {
55 * Main entry point. Scenario 1. Our user received a friend request notification (perhaps
56 * from another site) and clicked 'Approve'.
57 * $POST['source_url'] is not set. If it is, it indicates Scenario 2.
59 * We may also have been called directly from dfrn_request ($handsfree != null) due to
60 * this being a page type which supports automatic friend acceptance. That is also Scenario 1
61 * since we are operating on behalf of our registered user to approve a friendship.
63 if (empty($_POST['source_url'])) {
64 $uid = defaults($handsfree, 'uid', local_user());
66 notice(L10n::t('Permission denied.') . EOL);
70 $user = DBA::selectFirst('user', [], ['uid' => $uid]);
71 if (!DBA::isResult($user)) {
72 notice(L10n::t('Profile not found.') . EOL);
76 // These data elements may come from either the friend request notification form or $handsfree array.
77 if (is_array($handsfree)) {
78 Logger::log('Confirm in handsfree mode');
79 $dfrn_id = $handsfree['dfrn_id'];
80 $intro_id = $handsfree['intro_id'];
81 $duplex = $handsfree['duplex'];
83 $hidden = intval(defaults($handsfree, 'hidden' , 0));
85 $dfrn_id = Strings::escapeTags(trim(defaults($_POST, 'dfrn_id' , '')));
86 $intro_id = intval(defaults($_POST, 'intro_id' , 0));
87 $duplex = intval(defaults($_POST, 'duplex' , 0));
88 $cid = intval(defaults($_POST, 'contact_id', 0));
89 $hidden = intval(defaults($_POST, 'hidden' , 0));
93 * Ensure that dfrn_id has precedence when we go to find the contact record.
94 * We only want to search based on contact id if there is no dfrn_id,
95 * e.g. for OStatus network followers.
97 if (strlen($dfrn_id)) {
101 Logger::log('Confirming request for dfrn_id (issued) ' . $dfrn_id);
103 Logger::log('Confirming follower with contact_id: ' . $cid);
107 * The other person will have been issued an ID when they first requested friendship.
108 * Locate their record. At this time, their record will have both pending and blocked set to 1.
109 * There won't be any dfrn_id if this is a network follower, so use the contact_id instead.
114 (`issued-id` != '' AND `issued-id` = '%s')
116 (`id` = %d AND `id` != 0)
121 DBA::escape($dfrn_id),
125 if (!DBA::isResult($r)) {
126 Logger::log('Contact not found in DB.');
127 notice(L10n::t('Contact not found.') . EOL);
128 notice(L10n::t('This may occasionally happen if contact was requested by both persons and it has already been approved.') . EOL);
134 $contact_id = $contact['id'];
135 $relation = $contact['rel'];
136 $site_pubkey = $contact['site-pubkey'];
137 $dfrn_confirm = $contact['confirm'];
138 $aes_allow = $contact['aes_allow'];
140 $network = ((strlen($contact['issued-id'])) ? Protocol::DFRN : Protocol::OSTATUS);
142 if ($contact['network']) {
143 $network = $contact['network'];
146 // an empty DFRN-ID tells us that it had been a request via AP from a Friendica contact
147 if (($network === Protocol::DFRN) && empty($dfrn_id)) {
148 $network = Contact::getProtocol($contact['url'], $contact['network']);
151 if ($network === Protocol::DFRN) {
153 * Generate a key pair for all further communications with this person.
154 * We have a keypair for every contact, and a site key for unknown people.
155 * This provides a means to carry on relationships with other people if
156 * any single key is compromised. It is a robust key. We're much more
157 * worried about key leakage than anybody cracking it.
159 $res = Crypto::newKeypair(4096);
161 $private_key = $res['prvkey'];
162 $public_key = $res['pubkey'];
164 // Save the private key. Send them the public key.
165 $fields = ['prvkey' => $private_key, 'protocol' => Protocol::DFRN];
166 DBA::update('contact', $fields, ['id' => $contact_id]);
171 * Per the DFRN protocol, we will verify both ends by encrypting the dfrn_id with our
172 * site private key (person on the other end can decrypt it with our site public key).
173 * Then encrypt our profile URL with the other person's site public key. They can decrypt
174 * it with their site private key. If the decryption on the other end fails for either
175 * item, it indicates tampering or key failure on at least one site and we will not be
176 * able to provide a secure communication pathway.
178 * If other site is willing to accept full encryption, (aes_allow is 1 AND we have php5.3
179 * or later) then we encrypt the personal public key we send them using AES-256-CBC and a
180 * random key which is encrypted with their site public key.
183 $src_aes_key = openssl_random_pseudo_bytes(64);
186 openssl_private_encrypt($dfrn_id, $result, $user['prvkey']);
188 $params['dfrn_id'] = bin2hex($result);
189 $params['public_key'] = $public_key;
191 $my_url = System::baseUrl() . '/profile/' . $user['nickname'];
193 openssl_public_encrypt($my_url, $params['source_url'], $site_pubkey);
194 $params['source_url'] = bin2hex($params['source_url']);
196 if ($aes_allow && function_exists('openssl_encrypt')) {
197 openssl_public_encrypt($src_aes_key, $params['aes_key'], $site_pubkey);
198 $params['aes_key'] = bin2hex($params['aes_key']);
199 $params['public_key'] = bin2hex(openssl_encrypt($public_key, 'AES-256-CBC', $src_aes_key));
202 $params['dfrn_version'] = DFRN_PROTOCOL_VERSION;
204 $params['duplex'] = 1;
207 if ($user['page-flags'] == User::PAGE_FLAGS_COMMUNITY) {
211 if ($user['page-flags'] == User::PAGE_FLAGS_PRVGROUP) {
215 Logger::log('Confirm: posting data to ' . $dfrn_confirm . ': ' . print_r($params, true), Logger::DATA);
219 * POST all this stuff to the other site.
220 * Temporarily raise the network timeout to 120 seconds because the default 60
221 * doesn't always give the other side quite enough time to decrypt everything.
225 $res = Network::post($dfrn_confirm, $params, null, $redirects, 120)->getBody();
227 Logger::log(' Confirm: received data: ' . $res, Logger::DATA);
229 // Now figure out what they responded. Try to be robust if the remote site is
230 // having difficulty and throwing up errors of some kind.
232 $leading_junk = substr($res, 0, strpos($res, '<?xml'));
234 $res = substr($res, strpos($res, '<?xml'));
236 // No XML at all, this exchange is messed up really bad.
237 // We shouldn't proceed, because the xml parser might choke,
238 // and $status is going to be zero, which indicates success.
239 // We can hardly call this a success.
240 notice(L10n::t('Response from remote site was not understood.') . EOL);
244 if (strlen($leading_junk) && Config::get('system', 'debugging')) {
245 // This might be more common. Mixed error text and some XML.
246 // If we're configured for debugging, show the text. Proceed in either case.
247 notice(L10n::t('Unexpected response from remote site: ') . EOL . $leading_junk . EOL);
250 if (stristr($res, "<status") === false) {
251 // wrong xml! stop here!
252 Logger::log('Unexpected response posting to ' . $dfrn_confirm);
253 notice(L10n::t('Unexpected response from remote site: ') . EOL . htmlspecialchars($res) . EOL);
257 $xml = XML::parseString($res);
258 $status = (int) $xml->status;
259 $message = XML::unescape($xml->message); // human readable text of what may have gone wrong.
262 info(L10n::t("Confirmation completed successfully.") . EOL);
265 // birthday paradox - generate new dfrn-id and fall through.
266 $new_dfrn_id = Strings::getRandomHex();
267 q("UPDATE contact SET `issued-id` = '%s' WHERE `id` = %d AND `uid` = %d",
268 DBA::escape($new_dfrn_id),
274 notice(L10n::t("Temporary failure. Please wait and try again.") . EOL);
277 notice(L10n::t("Introduction failed or was revoked.") . EOL);
281 if (strlen($message)) {
282 notice(L10n::t('Remote site reported: ') . $message . EOL);
285 if (($status == 0) && $intro_id) {
286 $intro = DBA::selectFirst('intro', ['note'], ['id' => $intro_id]);
287 if (DBA::isResult($intro)) {
288 DBA::update('contact', ['reason' => $intro['note']], ['id' => $contact_id]);
291 // Success. Delete the notification.
292 DBA::delete('intro', ['id' => $intro_id]);
299 DBA::update('contact', ['protocol' => $network], ['id' => $contact_id]);
303 * We have now established a relationship with the other site.
304 * Let's make our own personal copy of their profile photo so we don't have
305 * to always load it from their site.
307 * We will also update the contact record with the nature and scope of the relationship.
309 Contact::updateAvatar($contact['photo'], $uid, $contact_id);
311 Logger::log('dfrn_confirm: confirm - imported photos');
313 if ($network === Protocol::DFRN) {
314 $new_relation = Contact::FOLLOWER;
316 if (($relation == Contact::SHARING) || ($duplex)) {
317 $new_relation = Contact::FRIEND;
320 if (($relation == Contact::SHARING) && ($duplex)) {
324 $r = q("UPDATE `contact` SET `rel` = %d,
331 `network` = '%s' WHERE `id` = %d
333 intval($new_relation),
334 DBA::escape(DateTimeFormat::utcNow()),
335 DBA::escape(DateTimeFormat::utcNow()),
338 DBA::escape(Protocol::DFRN),
342 if ($network == Protocol::ACTIVITYPUB) {
343 ActivityPub\Transmitter::sendContactAccept($contact['url'], $contact['hub-verify'], $uid);
344 // Setting "pending" to true on a bidirectional contact request could create a problem when it isn't accepted on the other side
345 // Then we have got a situation where - although one direction is accepted - the contact still appears as pending.
346 // Possibly we need two different "pending" fields, one for incoming, one for outgoing?
347 // This has to be thought over, but for now this here is a better solution.
348 // $pending = $duplex;
354 // $network !== Protocol::DFRN
355 $network = defaults($contact, 'network', Protocol::OSTATUS);
357 $arr = Probe::uri($contact['url'], $network);
359 $notify = defaults($contact, 'notify' , $arr['notify']);
360 $poll = defaults($contact, 'poll' , $arr['poll']);
362 $addr = $arr['addr'];
364 $new_relation = $contact['rel'];
365 $writable = $contact['writable'];
367 if (in_array($network, [Protocol::DIASPORA, Protocol::ACTIVITYPUB])) {
369 $new_relation = Contact::FRIEND;
371 $new_relation = Contact::FOLLOWER;
374 if ($new_relation != Contact::FOLLOWER) {
379 DBA::delete('intro', ['id' => $intro_id]);
381 $fields = ['name-date' => DateTimeFormat::utcNow(),
382 'uri-date' => DateTimeFormat::utcNow(), 'addr' => $addr,
383 'notify' => $notify, 'poll' => $poll, 'blocked' => false,
384 'pending' => $pending, 'network' => $network,
385 'writable' => $writable, 'hidden' => $hidden, 'rel' => $new_relation];
386 DBA::update('contact', $fields, ['id' => $contact_id]);
389 if (!DBA::isResult($r)) {
390 notice(L10n::t('Unable to set contact photo.') . EOL);
393 // reload contact info
394 $contact = DBA::selectFirst('contact', [], ['id' => $contact_id]);
395 if ((isset($new_relation) && $new_relation == Contact::FRIEND)) {
396 if (DBA::isResult($contact) && ($contact['network'] === Protocol::DIASPORA)) {
397 $ret = Diaspora::sendShare($user, $contact);
398 Logger::log('share returns: ' . $ret);
402 Group::addMember(User::getDefaultGroup($uid, $contact["network"]), $contact['id']);
404 if ($network == Protocol::ACTIVITYPUB && $duplex) {
405 ActivityPub\Transmitter::sendActivity('Follow', $contact['url'], $uid);
408 // Let's send our user to the contact editor in case they want to
409 // do anything special with this new friend.
410 if ($handsfree === null) {
411 $a->internalRedirect('contact/' . intval($contact_id));
419 * End of Scenario 1. [Local confirmation of remote friend request].
421 * Begin Scenario 2. This is the remote response to the above scenario.
422 * This will take place on the site that originally initiated the friend request.
423 * In the section above where the confirming party makes a POST and
424 * retrieves xml status information, they are communicating with the following code.
426 if (!empty($_POST['source_url'])) {
427 // We are processing an external confirmation to an introduction created by our user.
428 $public_key = defaults($_POST, 'public_key', '');
429 $dfrn_id = hex2bin(defaults($_POST, 'dfrn_id' , ''));
430 $source_url = hex2bin(defaults($_POST, 'source_url', ''));
431 $aes_key = defaults($_POST, 'aes_key' , '');
432 $duplex = intval(defaults($_POST, 'duplex' , 0));
433 $page = intval(defaults($_POST, 'page' , 0));
435 $forum = (($page == 1) ? 1 : 0);
436 $prv = (($page == 2) ? 1 : 0);
438 Logger::log('dfrn_confirm: requestee contacted: ' . $node);
440 Logger::log('dfrn_confirm: request: POST=' . print_r($_POST, true), Logger::DATA);
442 // If $aes_key is set, both of these items require unpacking from the hex transport encoding.
444 if (!empty($aes_key)) {
445 $aes_key = hex2bin($aes_key);
446 $public_key = hex2bin($public_key);
449 // Find our user's account
450 $user = DBA::selectFirst('user', [], ['nickname' => $node]);
451 if (!DBA::isResult($user)) {
452 $message = L10n::t('No user record found for \'%s\' ', $node);
453 System::xmlExit(3, $message); // failure
457 $my_prvkey = $user['prvkey'];
458 $local_uid = $user['uid'];
461 if (!strstr($my_prvkey, 'PRIVATE KEY')) {
462 $message = L10n::t('Our site encryption key is apparently messed up.');
463 System::xmlExit(3, $message);
468 $decrypted_source_url = "";
469 openssl_private_decrypt($source_url, $decrypted_source_url, $my_prvkey);
472 if (!strlen($decrypted_source_url)) {
473 $message = L10n::t('Empty site URL was provided or URL could not be decrypted by us.');
474 System::xmlExit(3, $message);
478 $contact = DBA::selectFirst('contact', [], ['url' => $decrypted_source_url, 'uid' => $local_uid]);
479 if (!DBA::isResult($contact)) {
480 if (strstr($decrypted_source_url, 'http:')) {
481 $newurl = str_replace('http:', 'https:', $decrypted_source_url);
483 $newurl = str_replace('https:', 'http:', $decrypted_source_url);
486 $contact = DBA::selectFirst('contact', [], ['url' => $newurl, 'uid' => $local_uid]);
487 if (!DBA::isResult($contact)) {
488 // this is either a bogus confirmation (?) or we deleted the original introduction.
489 $message = L10n::t('Contact record was not found for you on our site.');
490 System::xmlExit(3, $message);
491 return; // NOTREACHED
495 $relation = $contact['rel'];
497 // Decrypt all this stuff we just received
499 $foreign_pubkey = $contact['site-pubkey'];
500 $dfrn_record = $contact['id'];
502 if (!$foreign_pubkey) {
503 $message = L10n::t('Site public key not available in contact record for URL %s.', $decrypted_source_url);
504 System::xmlExit(3, $message);
507 $decrypted_dfrn_id = "";
508 openssl_public_decrypt($dfrn_id, $decrypted_dfrn_id, $foreign_pubkey);
510 if (strlen($aes_key)) {
511 $decrypted_aes_key = "";
512 openssl_private_decrypt($aes_key, $decrypted_aes_key, $my_prvkey);
513 $dfrn_pubkey = openssl_decrypt($public_key, 'AES-256-CBC', $decrypted_aes_key);
515 $dfrn_pubkey = $public_key;
518 if (DBA::exists('contact', ['dfrn-id' => $decrypted_dfrn_id])) {
519 $message = L10n::t('The ID provided by your system is a duplicate on our system. It should work if you try again.');
520 System::xmlExit(1, $message); // Birthday paradox - duplicate dfrn-id
524 $r = q("UPDATE `contact` SET `dfrn-id` = '%s', `pubkey` = '%s' WHERE `id` = %d",
525 DBA::escape($decrypted_dfrn_id),
526 DBA::escape($dfrn_pubkey),
529 if (!DBA::isResult($r)) {
530 $message = L10n::t('Unable to set your contact credentials on our system.');
531 System::xmlExit(3, $message);
534 // It's possible that the other person also requested friendship.
535 // If it is a duplex relationship, ditch the issued-id if one exists.
538 q("UPDATE `contact` SET `issued-id` = '' WHERE `id` = %d",
543 // We're good but now we have to scrape the profile photo and send notifications.
544 $contact = DBA::selectFirst('contact', ['photo'], ['id' => $dfrn_record]);
545 if (DBA::isResult($contact)) {
546 $photo = $contact['photo'];
548 $photo = System::baseUrl() . '/images/person-300.jpg';
551 Contact::updateAvatar($photo, $local_uid, $dfrn_record);
553 Logger::log('dfrn_confirm: request - photos imported');
555 $new_relation = Contact::SHARING;
557 if (($relation == Contact::FOLLOWER) || ($duplex)) {
558 $new_relation = Contact::FRIEND;
561 if (($relation == Contact::FOLLOWER) && ($duplex)) {
565 $r = q("UPDATE `contact` SET
574 `network` = '%s' WHERE `id` = %d
576 intval($new_relation),
577 DBA::escape(DateTimeFormat::utcNow()),
578 DBA::escape(DateTimeFormat::utcNow()),
582 DBA::escape(Protocol::DFRN),
585 if (!DBA::isResult($r)) { // indicates schema is messed up or total db failure
586 $message = L10n::t('Unable to update your contact profile details on our system');
587 System::xmlExit(3, $message);
590 // Otherwise everything seems to have worked and we are almost done. Yay!
591 // Send an email notification
593 Logger::log('dfrn_confirm: request: info updated');
596 $r = q("SELECT `contact`.*, `user`.*
598 LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
599 WHERE `contact`.`id` = %d
603 if (DBA::isResult($r)) {
606 if ($combined['notify-flags'] & NOTIFY_CONFIRM) {
607 $mutual = ($new_relation == Contact::FRIEND);
609 'type' => NOTIFY_CONFIRM,
610 'notify_flags' => $combined['notify-flags'],
611 'language' => $combined['language'],
612 'to_name' => $combined['username'],
613 'to_email' => $combined['email'],
614 'uid' => $combined['uid'],
615 'link' => System::baseUrl() . '/contact/' . $dfrn_record,
616 'source_name' => ((strlen(stripslashes($combined['name']))) ? stripslashes($combined['name']) : L10n::t('[Name Withheld]')),
617 'source_link' => $combined['url'],
618 'source_photo' => $combined['photo'],
619 'verb' => ($mutual?ACTIVITY_FRIEND:ACTIVITY_FOLLOW),
625 System::xmlExit(0); // Success
626 return; // NOTREACHED
627 ////////////////////// End of this scenario ///////////////////////////////////////////////
630 // somebody arrived here by mistake or they are fishing. Send them to the homepage.
631 $a->internalRedirect();