378 lines
12 KiB
PHP
378 lines
12 KiB
PHP
<?php
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/**
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* @file mod/dfrn_notify.php
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* 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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use Friendica\Core\Logger;
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use Friendica\Core\System;
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use Friendica\Database\DBA;
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use Friendica\Model\Contact;
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use Friendica\Model\User;
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use Friendica\Protocol\DFRN;
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use Friendica\Protocol\Diaspora;
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use Friendica\Util\Network;
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use Friendica\Util\Strings;
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function dfrn_notify_post(App $a) {
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Logger::log(__function__, Logger::TRACE);
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$postdata = Network::postdata();
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if (empty($_POST) || !empty($postdata)) {
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$data = json_decode($postdata);
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if (is_object($data)) {
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$nick = $a->argv[1] ?? '';
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$user = DBA::selectFirst('user', [], ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false]);
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if (!DBA::isResult($user)) {
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throw new \Friendica\Network\HTTPException\InternalServerErrorException();
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}
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dfrn_dispatch_private($user, $postdata);
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} elseif (!dfrn_dispatch_public($postdata)) {
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require_once 'mod/salmon.php';
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salmon_post($a, $postdata);
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}
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}
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$dfrn_id = (!empty($_POST['dfrn_id']) ? Strings::escapeTags(trim($_POST['dfrn_id'])) : '');
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$dfrn_version = (!empty($_POST['dfrn_version']) ? (float) $_POST['dfrn_version'] : 2.0);
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$challenge = (!empty($_POST['challenge']) ? Strings::escapeTags(trim($_POST['challenge'])) : '');
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$data = $_POST['data'] ?? '';
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$key = $_POST['key'] ?? '';
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$rino_remote = (!empty($_POST['rino']) ? intval($_POST['rino']) : 0);
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$dissolve = (!empty($_POST['dissolve']) ? intval($_POST['dissolve']) : 0);
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$perm = (!empty($_POST['perm']) ? Strings::escapeTags(trim($_POST['perm'])) : 'r');
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$ssl_policy = (!empty($_POST['ssl_policy']) ? Strings::escapeTags(trim($_POST['ssl_policy'])): 'none');
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$page = (!empty($_POST['page']) ? intval($_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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if (!DBA::exists('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge])) {
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Logger::log('could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
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System::xmlExit(3, 'Could not match challenge');
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}
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DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]);
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$user = DBA::selectFirst('user', ['uid'], ['nickname' => $a->argv[1]]);
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if (!DBA::isResult($user)) {
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Logger::log('User not found for nickname ' . $a->argv[1]);
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System::xmlExit(3, 'User not found');
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}
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// find the local user who owns this relationship.
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$condition = [];
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switch ($direction) {
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case (-1):
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$condition = ["(`issued-id` = ? OR `dfrn-id` = ?) AND `uid` = ?", $dfrn_id, $dfrn_id, $user['uid']];
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break;
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case 0:
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$condition = ['issued-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']];
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break;
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case 1:
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$condition = ['dfrn-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']];
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break;
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default:
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System::xmlExit(3, 'Invalid direction');
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break; // NOTREACHED
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}
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$contact = DBA::selectFirst('contact', ['id'], $condition);
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if (!DBA::isResult($contact)) {
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Logger::log('contact not found for dfrn_id ' . $dfrn_id);
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System::xmlExit(3, 'Contact not found');
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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 = DFRN::getImporter($contact['id'], $user['uid']);
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if ((($writable != (-1)) && ($writable != $importer['writable'])) || ($importer['forum'] != $forum) || ($importer['prv'] != $prv)) {
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$fields = ['writable' => ($writable == (-1)) ? $importer['writable'] : $writable,
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'forum' => $forum, 'prv' => $prv];
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DBA::update('contact', $fields, ['id' => $importer['id']]);
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if ($writable != (-1)) {
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$importer['writable'] = $writable;
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}
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$importer['forum'] = $page;
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}
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// if contact's ssl policy changed, update our links
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$importer = Contact::updateSslPolicy($importer, $ssl_policy);
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Logger::log('data: ' . $data, Logger::DATA);
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if ($dissolve == 1) {
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// Relationship is dissolved permanently
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Contact::remove($importer['id']);
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Logger::log('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
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System::xmlExit(0, 'relationship dissolved');
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}
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$rino = Config::get('system', 'rino_encrypt');
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$rino = intval($rino);
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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 > 1 && $rino < $rino_remote) {
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Logger::log("rino version '$rino_remote' is lower than supported '$rino'");
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System::xmlExit(0, "rino version '$rino_remote' is lower than supported '$rino'");
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}
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$rawkey = hex2bin(trim($key));
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Logger::log('rino: md5 raw key: ' . md5($rawkey), Logger::DATA);
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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, $importer['cprvkey']);
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}
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}
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switch ($rino_remote) {
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case 0:
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case 1:
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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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$data = DFRN::aesDecrypt(hex2bin($data), $final_key);
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break;
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default:
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Logger::log("rino: invalid sent version '$rino_remote'");
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System::xmlExit(0, "Invalid sent version '$rino_remote'");
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}
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Logger::log('rino: decrypted data: ' . $data, Logger::DATA);
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}
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Logger::log('Importing post from ' . $importer['addr'] . ' to ' . $importer['nickname'] . ' with the RINO ' . $rino_remote . ' encryption.', Logger::DEBUG);
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$ret = DFRN::import($data, $importer);
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System::xmlExit($ret, 'Processed');
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// NOTREACHED
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}
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function dfrn_dispatch_public($postdata)
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{
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$msg = Diaspora::decodeRaw($postdata, '', true);
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if (!$msg) {
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// We have to fail silently to be able to hand it over to the salmon parser
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return false;
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}
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// Fetch the corresponding public contact
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$contact_id = Contact::getIdForURL($msg['author']);
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if (empty($contact_id)) {
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Logger::log('Contact not found for address ' . $msg['author']);
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System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found');
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}
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$importer = DFRN::getImporter($contact_id);
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// This should never fail
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if (empty($importer)) {
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Logger::log('Contact not found for address ' . $msg['author']);
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System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found');
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}
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Logger::log('Importing post from ' . $msg['author'] . ' with the public envelope.', Logger::DEBUG);
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// Now we should be able to import it
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$ret = DFRN::import($msg['message'], $importer);
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System::xmlExit($ret, 'Done');
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}
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function dfrn_dispatch_private($user, $postdata)
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{
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$msg = Diaspora::decodeRaw($postdata, $user['prvkey'] ?? '');
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if (!$msg) {
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System::xmlExit(4, 'Unable to parse message');
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}
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// Check if the user has got this contact
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$cid = Contact::getIdForURL($msg['author'], $user['uid']);
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if (!$cid) {
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// Otherwise there should be a public contact
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$cid = Contact::getIdForURL($msg['author']);
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if (!$cid) {
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Logger::log('Contact not found for address ' . $msg['author']);
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System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found');
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}
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}
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$importer = DFRN::getImporter($cid, $user['uid']);
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// This should never fail
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if (empty($importer)) {
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Logger::log('Contact not found for address ' . $msg['author']);
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System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found');
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}
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Logger::log('Importing post from ' . $msg['author'] . ' to ' . $user['nickname'] . ' with the private envelope.', Logger::DEBUG);
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// Now we should be able to import it
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$ret = DFRN::import($msg['message'], $importer);
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System::xmlExit($ret, 'Done');
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}
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function dfrn_notify_content(App $a) {
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if (!empty($_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 = Strings::escapeTags(trim($_GET['dfrn_id']));
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$rino_remote = (!empty($_GET['rino']) ? intval($_GET['rino']) : 0);
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$type = "";
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$last_update = "";
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Logger::log('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 = Strings::getRandomHex();
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$status = 0;
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DBA::delete('challenge', ["`expire` < ?", time()]);
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$fields = ['challenge' => $hash, 'dfrn-id' => $dfrn_id, 'expire' => time() + 90,
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'type' => $type, 'last_update' => $last_update];
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DBA::insert('challenge', $fields);
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Logger::log('challenge=' . $hash, Logger::DATA);
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$user = DBA::selectFirst('user', ['uid'], ['nickname' => $a->argv[1]]);
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if (!DBA::isResult($user)) {
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Logger::log('User not found for nickname ' . $a->argv[1]);
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exit();
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}
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$condition = [];
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switch ($direction) {
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case (-1):
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$condition = ["(`issued-id` = ? OR `dfrn-id` = ?) AND `uid` = ?", $dfrn_id, $dfrn_id, $user['uid']];
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$my_id = $dfrn_id;
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break;
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case 0:
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$condition = ['issued-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']];
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$my_id = '1:' . $dfrn_id;
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break;
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case 1:
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$condition = ['dfrn-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']];
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$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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$my_id = '';
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break;
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}
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$contact = DBA::selectFirst('contact', ['id'], $condition);
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if (!DBA::isResult($contact)) {
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Logger::log('contact not found for dfrn_id ' . $dfrn_id);
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System::xmlExit(3, 'Contact not found');
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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 = DFRN::getImporter($contact['id'], $user['uid']);
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if (empty($importer)) {
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Logger::log('No importer data found for user ' . $a->argv[1] . ' and contact ' . $dfrn_id);
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exit();
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}
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Logger::log("Remote rino version: ".$rino_remote." for ".$importer["url"], Logger::DATA);
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$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($importer['cprvkey']);
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$pub_key = trim($importer['cpubkey']);
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$dplx = intval($importer['duplex']);
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if (($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::log("Local rino version: ". $rino, Logger::DATA);
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// if requested rino is lower than enabled local rino, lower local rino version
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// if requested rino is higher than enabled local rino, reply with local rino
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if ($rino_remote < $rino) {
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$rino = $rino_remote;
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}
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if (($importer['rel'] && ($importer['rel'] != Contact::SHARING)) || ($importer['page-flags'] == User::PAGE_FLAGS_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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exit();
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}
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}
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