349 lines
11 KiB
PHP
349 lines
11 KiB
PHP
<?php
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/**
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* @file mod/dfrn_notify.php
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* @brief The dfrn notify endpoint
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* @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
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*/
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use Friendica\App;
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use Friendica\Core\Config;
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require_once('include/items.php');
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require_once('include/dfrn.php');
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require_once('include/event.php');
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require_once('library/defuse/php-encryption-1.2.1/Crypto.php');
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function dfrn_notify_post(App $a) {
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logger(__function__, LOGGER_TRACE);
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$dfrn_id = ((x($_POST,'dfrn_id')) ? notags(trim($_POST['dfrn_id'])) : '');
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$dfrn_version = ((x($_POST,'dfrn_version')) ? (float) $_POST['dfrn_version'] : 2.0);
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$challenge = ((x($_POST,'challenge')) ? notags(trim($_POST['challenge'])) : '');
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$data = ((x($_POST,'data')) ? $_POST['data'] : '');
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$key = ((x($_POST,'key')) ? $_POST['key'] : '');
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$rino_remote = ((x($_POST,'rino')) ? intval($_POST['rino']) : 0);
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$dissolve = ((x($_POST,'dissolve')) ? intval($_POST['dissolve']) : 0);
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$perm = ((x($_POST,'perm')) ? notags(trim($_POST['perm'])) : 'r');
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$ssl_policy = ((x($_POST,'ssl_policy')) ? notags(trim($_POST['ssl_policy'])): 'none');
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$page = ((x($_POST,'page')) ? intval($_POST['page']) : 0);
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$forum = (($page == 1) ? 1 : 0);
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$prv = (($page == 2) ? 1 : 0);
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$writable = (-1);
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if ($dfrn_version >= 2.21) {
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$writable = (($perm === 'rw') ? 1 : 0);
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}
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$direction = (-1);
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if (strpos($dfrn_id, ':') == 1) {
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$direction = intval(substr($dfrn_id, 0, 1));
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$dfrn_id = substr($dfrn_id, 2);
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}
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$r = q("SELECT * FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s' LIMIT 1",
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dbesc($dfrn_id),
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dbesc($challenge)
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);
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if (! dbm::is_result($r)) {
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logger('dfrn_notify: could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
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xml_status(3, 'Could not match challenge');
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}
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$r = q("DELETE FROM `challenge` WHERE `dfrn-id` = '%s' AND `challenge` = '%s'",
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dbesc($dfrn_id),
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dbesc($challenge)
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);
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// find the local user who owns this relationship.
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$sql_extra = '';
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switch ($direction) {
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case (-1):
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$sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
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break;
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case 0:
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$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
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break;
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case 1:
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$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
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break;
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default:
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xml_status(3, 'Invalid direction');
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break; // NOTREACHED
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}
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/*
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* be careful - $importer will contain both the contact information for the contact
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* sending us the post, and also the user information for the person receiving it.
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* since they are mixed together, it is easy to get them confused.
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*/
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$r = q("SELECT `contact`.*, `contact`.`uid` AS `importer_uid`,
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`contact`.`pubkey` AS `cpubkey`,
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`contact`.`prvkey` AS `cprvkey`,
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`contact`.`thumb` AS `thumb`,
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`contact`.`url` as `url`,
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`contact`.`name` as `senderName`,
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`user`.*
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FROM `contact`
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LEFT JOIN `user` ON `contact`.`uid` = `user`.`uid`
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WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0
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AND `user`.`nickname` = '%s' AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1",
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dbesc($a->argv[1])
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);
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if (! dbm::is_result($r)) {
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logger('dfrn_notify: contact not found for dfrn_id ' . $dfrn_id);
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xml_status(3, 'Contact not found');
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//NOTREACHED
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}
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// $importer in this case contains the contact record for the remote contact joined with the user record of our user.
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$importer = $r[0];
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logger("Remote rino version: ".$rino_remote." for ".$importer["url"], LOGGER_DEBUG);
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if ((($writable != (-1)) && ($writable != $importer['writable'])) || ($importer['forum'] != $forum) || ($importer['prv'] != $prv)) {
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q("UPDATE `contact` SET `writable` = %d, forum = %d, prv = %d WHERE `id` = %d",
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intval(($writable == (-1)) ? $importer['writable'] : $writable),
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intval($forum),
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intval($prv),
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intval($importer['id'])
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);
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if ($writable != (-1)) {
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$importer['writable'] = $writable;
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}
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$importer['forum'] = $page;
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}
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// if contact's ssl policy changed, update our links
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fix_contact_ssl_policy($importer,$ssl_policy);
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logger('dfrn_notify: received notify from ' . $importer['name'] . ' for ' . $importer['username']);
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logger('dfrn_notify: data: ' . $data, LOGGER_DATA);
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if ($dissolve == 1) {
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/*
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* Relationship is dissolved permanently
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*/
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require_once('include/Contact.php');
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contact_remove($importer['id']);
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logger('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
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xml_status(0, 'relationship dissolved');
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}
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$rino = Config::get('system', 'rino_encrypt');
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$rino = intval($rino);
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logger("Local rino version: " . $rino, LOGGER_DEBUG);
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if (strlen($key)) {
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// if local rino is lower than remote rino, abort: should not happen!
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// but only for $remote_rino > 1, because old code did't send rino version
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if ($rino_remote_version > 1 && $rino < $rino_remote) {
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logger("rino version '$rino_remote' is lower than supported '$rino'");
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xml_status(0, "rino version '$rino_remote' is lower than supported '$rino'");
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}
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$rawkey = hex2bin(trim($key));
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logger('rino: md5 raw key: ' . md5($rawkey));
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$final_key = '';
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if ($dfrn_version >= 2.1) {
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if ((($importer['duplex']) && strlen($importer['cprvkey'])) || (! strlen($importer['cpubkey']))) {
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openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']);
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} else {
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openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']);
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}
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} else {
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if ((($importer['duplex']) && strlen($importer['cpubkey'])) || (! strlen($importer['cprvkey']))) {
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openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']);
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} else {
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openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']);
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}
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}
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#logger('rino: received key : ' . $final_key);
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switch($rino_remote) {
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case 0:
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case 1:
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/*
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*we got a key. old code send only the key, without RINO version.
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* we assume RINO 1 if key and no RINO version
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*/
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$data = dfrn::aes_decrypt(hex2bin($data), $final_key);
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break;
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case 2:
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try {
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$data = Crypto::decrypt(hex2bin($data), $final_key);
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} catch (InvalidCiphertext $ex) { // VERY IMPORTANT
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/*
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* Either:
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* 1. The ciphertext was modified by the attacker,
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* 2. The key is wrong, or
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* 3. $ciphertext is not a valid ciphertext or was corrupted.
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* Assume the worst.
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*/
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logger('The ciphertext has been tampered with!');
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xml_status(0, 'The ciphertext has been tampered with!');
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} catch (Ex\CryptoTestFailed $ex) {
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logger('Cannot safely perform dencryption');
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xml_status(0, 'CryptoTestFailed');
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} catch (Ex\CannotPerformOperation $ex) {
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logger('Cannot safely perform decryption');
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xml_status(0, 'Cannot safely perform decryption');
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}
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break;
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default:
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logger("rino: invalid sent version '$rino_remote'");
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xml_status(0, "Invalid sent version '$rino_remote'");
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}
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logger('rino: decrypted data: ' . $data, LOGGER_DATA);
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}
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$ret = dfrn::import($data, $importer);
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xml_status($ret, 'Processed');
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// NOTREACHED
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}
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function dfrn_notify_content(App $a) {
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if(x($_GET,'dfrn_id')) {
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/*
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* initial communication from external contact, $direction is their direction.
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* If this is a duplex communication, ours will be the opposite.
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*/
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$dfrn_id = notags(trim($_GET['dfrn_id']));
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$dfrn_version = (float) $_GET['dfrn_version'];
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$rino_remote = ((x($_GET,'rino')) ? intval($_GET['rino']) : 0);
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$type = "";
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$last_update = "";
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logger('dfrn_notify: new notification dfrn_id=' . $dfrn_id);
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$direction = (-1);
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if(strpos($dfrn_id,':') == 1) {
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$direction = intval(substr($dfrn_id,0,1));
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$dfrn_id = substr($dfrn_id,2);
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}
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$hash = random_string();
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$status = 0;
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$r = q("DELETE FROM `challenge` WHERE `expire` < " . intval(time()));
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$r = q("INSERT INTO `challenge` ( `challenge`, `dfrn-id`, `expire` , `type`, `last_update` )
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VALUES( '%s', '%s', %d, '%s', '%s' ) ",
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dbesc($hash),
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dbesc($dfrn_id),
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intval(time() + 90 ),
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dbesc($type),
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dbesc($last_update)
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);
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logger('dfrn_notify: challenge=' . $hash, LOGGER_DEBUG);
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$sql_extra = '';
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switch($direction) {
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case (-1):
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$sql_extra = sprintf(" AND ( `issued-id` = '%s' OR `dfrn-id` = '%s' ) ", dbesc($dfrn_id), dbesc($dfrn_id));
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$my_id = $dfrn_id;
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break;
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case 0:
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$sql_extra = sprintf(" AND `issued-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
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$my_id = '1:' . $dfrn_id;
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break;
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case 1:
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$sql_extra = sprintf(" AND `dfrn-id` = '%s' AND `duplex` = 1 ", dbesc($dfrn_id));
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$my_id = '0:' . $dfrn_id;
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break;
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default:
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$status = 1;
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break; // NOTREACHED
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}
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$r = q("SELECT `contact`.*, `user`.`nickname`, `user`.`page-flags` FROM `contact` LEFT JOIN `user` ON `user`.`uid` = `contact`.`uid`
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WHERE `contact`.`blocked` = 0 AND `contact`.`pending` = 0 AND `user`.`nickname` = '%s'
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AND `user`.`account_expired` = 0 AND `user`.`account_removed` = 0 $sql_extra LIMIT 1",
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dbesc($a->argv[1])
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);
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if (! dbm::is_result($r)) {
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$status = 1;
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}
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logger("Remote rino version: ".$rino_remote." for ".$r[0]["url"], LOGGER_DEBUG);
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$challenge = '';
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$encrypted_id = '';
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$id_str = $my_id . '.' . mt_rand(1000,9999);
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$prv_key = trim($r[0]['prvkey']);
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$pub_key = trim($r[0]['pubkey']);
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$dplx = intval($r[0]['duplex']);
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if ((($dplx) && (strlen($prv_key))) || ((strlen($prv_key)) && (!(strlen($pub_key))))) {
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openssl_private_encrypt($hash, $challenge, $prv_key);
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openssl_private_encrypt($id_str, $encrypted_id, $prv_key);
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} elseif (strlen($pub_key)) {
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openssl_public_encrypt($hash, $challenge, $pub_key);
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openssl_public_encrypt($id_str, $encrypted_id, $pub_key);
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} else {
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/// @TODO these kind of else-blocks are making the code harder to understand
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$status = 1;
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}
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$challenge = bin2hex($challenge);
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$encrypted_id = bin2hex($encrypted_id);
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$rino = Config::get('system', 'rino_encrypt');
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$rino = intval($rino);
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logger("Local rino version: ". $rino, LOGGER_DEBUG);
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// if requested rino is lower than enabled local rino, lower local rino version
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// if requested rino is higher than enabled local rino, reply with local rino
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if ($rino_remote < $rino) {
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$rino = $rino_remote;
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}
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if((($r[0]['rel']) && ($r[0]['rel'] != CONTACT_IS_SHARING)) || ($r[0]['page-flags'] == PAGE_COMMUNITY)) {
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$perm = 'rw';
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} else {
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$perm = 'r';
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}
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header("Content-type: text/xml");
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echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
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. '<dfrn_notify>' . "\r\n"
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. "\t" . '<status>' . $status . '</status>' . "\r\n"
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. "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
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. "\t" . '<rino>' . $rino . '</rino>' . "\r\n"
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. "\t" . '<perm>' . $perm . '</perm>' . "\r\n"
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. "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
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. "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
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. '</dfrn_notify>' . "\r\n" ;
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killme();
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}
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}
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