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friendica-github/mod/dfrn_notify.php

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<?php
/**
* @file mod/dfrn_notify.php
* @brief The dfrn notify endpoint
* @see PDF with dfrn specs: https://github.com/friendica/friendica/blob/master/spec/dfrn2.pdf
*/
use Friendica\App;
use Friendica\Core\Config;
use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Model\Contact;
use Friendica\Protocol\DFRN;
use Friendica\Protocol\Diaspora;
use Friendica\Util\Strings;
function dfrn_notify_post(App $a) {
Logger::log(__function__, Logger::TRACE);
$postdata = file_get_contents('php://input');
if (empty($_POST) || !empty($postdata)) {
$data = json_decode($postdata);
if (is_object($data)) {
$nick = defaults($a->argv, 1, '');
$user = DBA::selectFirst('user', [], ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false]);
if (!DBA::isResult($user)) {
System::httpExit(500);
}
dfrn_dispatch_private($user, $postdata);
} elseif (!dfrn_dispatch_public($postdata)) {
require_once 'mod/salmon.php';
salmon_post($a, $postdata);
}
}
$dfrn_id = (!empty($_POST['dfrn_id']) ? Strings::escapeTags(trim($_POST['dfrn_id'])) : '');
$dfrn_version = (!empty($_POST['dfrn_version']) ? (float) $_POST['dfrn_version'] : 2.0);
$challenge = (!empty($_POST['challenge']) ? Strings::escapeTags(trim($_POST['challenge'])) : '');
$data = defaults($_POST, 'data', '');
$key = defaults($_POST, 'key', '');
$rino_remote = (!empty($_POST['rino']) ? intval($_POST['rino']) : 0);
$dissolve = (!empty($_POST['dissolve']) ? intval($_POST['dissolve']) : 0);
$perm = (!empty($_POST['perm']) ? Strings::escapeTags(trim($_POST['perm'])) : 'r');
$ssl_policy = (!empty($_POST['ssl_policy']) ? Strings::escapeTags(trim($_POST['ssl_policy'])): 'none');
$page = (!empty($_POST['page']) ? intval($_POST['page']) : 0);
$forum = (($page == 1) ? 1 : 0);
$prv = (($page == 2) ? 1 : 0);
$writable = (-1);
if ($dfrn_version >= 2.21) {
$writable = (($perm === 'rw') ? 1 : 0);
}
$direction = (-1);
if (strpos($dfrn_id, ':') == 1) {
$direction = intval(substr($dfrn_id, 0, 1));
$dfrn_id = substr($dfrn_id, 2);
}
if (!DBA::exists('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge])) {
Logger::log('could not match challenge to dfrn_id ' . $dfrn_id . ' challenge=' . $challenge);
System::xmlExit(3, 'Could not match challenge');
}
DBA::delete('challenge', ['dfrn-id' => $dfrn_id, 'challenge' => $challenge]);
$user = DBA::selectFirst('user', ['uid'], ['nickname' => $a->argv[1]]);
if (!DBA::isResult($user)) {
Logger::log('User not found for nickname ' . $a->argv[1]);
System::xmlExit(3, 'User not found');
}
// find the local user who owns this relationship.
$condition = [];
switch ($direction) {
case (-1):
$condition = ["(`issued-id` = ? OR `dfrn-id` = ?) AND `uid` = ?", $dfrn_id, $dfrn_id, $user['uid']];
break;
case 0:
$condition = ['issued-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']];
break;
case 1:
$condition = ['dfrn-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']];
break;
default:
System::xmlExit(3, 'Invalid direction');
break; // NOTREACHED
}
$contact = DBA::selectFirst('contact', ['id'], $condition);
if (!DBA::isResult($contact)) {
Logger::log('contact not found for dfrn_id ' . $dfrn_id);
System::xmlExit(3, 'Contact not found');
}
// $importer in this case contains the contact record for the remote contact joined with the user record of our user.
$importer = DFRN::getImporter($contact['id'], $user['uid']);
if ((($writable != (-1)) && ($writable != $importer['writable'])) || ($importer['forum'] != $forum) || ($importer['prv'] != $prv)) {
$fields = ['writable' => ($writable == (-1)) ? $importer['writable'] : $writable,
'forum' => $forum, 'prv' => $prv];
DBA::update('contact', $fields, ['id' => $importer['id']]);
if ($writable != (-1)) {
$importer['writable'] = $writable;
}
$importer['forum'] = $page;
}
// if contact's ssl policy changed, update our links
$importer = Contact::updateSslPolicy($importer, $ssl_policy);
Logger::log('data: ' . $data, Logger::DATA);
if ($dissolve == 1) {
// Relationship is dissolved permanently
Contact::remove($importer['id']);
Logger::log('relationship dissolved : ' . $importer['name'] . ' dissolved ' . $importer['username']);
System::xmlExit(0, 'relationship dissolved');
}
$rino = Config::get('system', 'rino_encrypt');
$rino = intval($rino);
if (strlen($key)) {
// if local rino is lower than remote rino, abort: should not happen!
// but only for $remote_rino > 1, because old code did't send rino version
if ($rino_remote > 1 && $rino < $rino_remote) {
Logger::log("rino version '$rino_remote' is lower than supported '$rino'");
System::xmlExit(0, "rino version '$rino_remote' is lower than supported '$rino'");
}
$rawkey = hex2bin(trim($key));
Logger::log('rino: md5 raw key: ' . md5($rawkey), Logger::DATA);
$final_key = '';
if ($dfrn_version >= 2.1) {
if (($importer['duplex'] && strlen($importer['cprvkey'])) || !strlen($importer['cpubkey'])) {
openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']);
} else {
openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']);
}
} else {
if (($importer['duplex'] && strlen($importer['cpubkey'])) || !strlen($importer['cprvkey'])) {
openssl_public_decrypt($rawkey, $final_key, $importer['cpubkey']);
} else {
openssl_private_decrypt($rawkey, $final_key, $importer['cprvkey']);
}
}
switch ($rino_remote) {
case 0:
case 1:
// we got a key. old code send only the key, without RINO version.
// we assume RINO 1 if key and no RINO version
$data = DFRN::aesDecrypt(hex2bin($data), $final_key);
break;
default:
Logger::log("rino: invalid sent version '$rino_remote'");
System::xmlExit(0, "Invalid sent version '$rino_remote'");
}
Logger::log('rino: decrypted data: ' . $data, Logger::DATA);
}
Logger::log('Importing post from ' . $importer['addr'] . ' to ' . $importer['nickname'] . ' with the RINO ' . $rino_remote . ' encryption.', Logger::DEBUG);
$ret = DFRN::import($data, $importer);
System::xmlExit($ret, 'Processed');
// NOTREACHED
}
function dfrn_dispatch_public($postdata)
{
$msg = Diaspora::decodeRaw([], $postdata, true);
if (!$msg) {
// We have to fail silently to be able to hand it over to the salmon parser
return false;
}
// Fetch the corresponding public contact
$contact = Contact::getDetailsByAddr($msg['author'], 0);
if (!$contact) {
Logger::log('Contact not found for address ' . $msg['author']);
System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found');
}
$importer = DFRN::getImporter($contact['id']);
// This should never fail
if (empty($importer)) {
Logger::log('Contact not found for address ' . $msg['author']);
System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found');
}
Logger::log('Importing post from ' . $msg['author'] . ' with the public envelope.', Logger::DEBUG);
// Now we should be able to import it
$ret = DFRN::import($msg['message'], $importer);
System::xmlExit($ret, 'Done');
}
function dfrn_dispatch_private($user, $postdata)
{
$msg = Diaspora::decodeRaw($user, $postdata);
if (!$msg) {
System::xmlExit(4, 'Unable to parse message');
}
// Check if the user has got this contact
$cid = Contact::getIdForURL($msg['author'], $user['uid']);
if (!$cid) {
// Otherwise there should be a public contact
$cid = Contact::getIdForURL($msg['author']);
if (!$cid) {
Logger::log('Contact not found for address ' . $msg['author']);
System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found');
}
}
$importer = DFRN::getImporter($cid, $user['uid']);
// This should never fail
if (empty($importer)) {
Logger::log('Contact not found for address ' . $msg['author']);
System::xmlExit(3, 'Contact ' . $msg['author'] . ' not found');
}
Logger::log('Importing post from ' . $msg['author'] . ' to ' . $user['nickname'] . ' with the private envelope.', Logger::DEBUG);
// Now we should be able to import it
$ret = DFRN::import($msg['message'], $importer);
System::xmlExit($ret, 'Done');
}
function dfrn_notify_content(App $a) {
if (!empty($_GET['dfrn_id'])) {
/*
* initial communication from external contact, $direction is their direction.
* If this is a duplex communication, ours will be the opposite.
*/
$dfrn_id = Strings::escapeTags(trim($_GET['dfrn_id']));
$dfrn_version = (float) $_GET['dfrn_version'];
$rino_remote = (!empty($_GET['rino']) ? intval($_GET['rino']) : 0);
$type = "";
$last_update = "";
Logger::log('new notification dfrn_id=' . $dfrn_id);
$direction = (-1);
if (strpos($dfrn_id,':') == 1) {
$direction = intval(substr($dfrn_id,0,1));
$dfrn_id = substr($dfrn_id,2);
}
$hash = Strings::getRandomHex();
$status = 0;
DBA::delete('challenge', ["`expire` < ?", time()]);
$fields = ['challenge' => $hash, 'dfrn-id' => $dfrn_id, 'expire' => time() + 90,
'type' => $type, 'last_update' => $last_update];
DBA::insert('challenge', $fields);
Logger::log('challenge=' . $hash, Logger::DATA);
$user = DBA::selectFirst('user', ['uid'], ['nickname' => $a->argv[1]]);
if (!DBA::isResult($user)) {
Logger::log('User not found for nickname ' . $a->argv[1]);
killme();
}
$condition = [];
switch ($direction) {
case (-1):
$condition = ["(`issued-id` = ? OR `dfrn-id` = ?) AND `uid` = ?", $dfrn_id, $dfrn_id, $user['uid']];
$my_id = $dfrn_id;
break;
case 0:
$condition = ['issued-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']];
$my_id = '1:' . $dfrn_id;
break;
case 1:
$condition = ['dfrn-id' => $dfrn_id, 'duplex' => true, 'uid' => $user['uid']];
$my_id = '0:' . $dfrn_id;
break;
default:
$status = 1;
break;
}
$contact = DBA::selectFirst('contact', ['id'], $condition);
if (!DBA::isResult($contact)) {
Logger::log('contact not found for dfrn_id ' . $dfrn_id);
System::xmlExit(3, 'Contact not found');
}
// $importer in this case contains the contact record for the remote contact joined with the user record of our user.
$importer = DFRN::getImporter($contact['id'], $user['uid']);
if (empty($importer)) {
Logger::log('No importer data found for user ' . $a->argv[1] . ' and contact ' . $dfrn_id);
killme();
}
Logger::log("Remote rino version: ".$rino_remote." for ".$importer["url"], Logger::DATA);
$challenge = '';
$encrypted_id = '';
$id_str = $my_id . '.' . mt_rand(1000,9999);
$prv_key = trim($importer['cprvkey']);
$pub_key = trim($importer['cpubkey']);
$dplx = intval($importer['duplex']);
if (($dplx && strlen($prv_key)) || (strlen($prv_key) && !strlen($pub_key))) {
openssl_private_encrypt($hash, $challenge, $prv_key);
openssl_private_encrypt($id_str, $encrypted_id, $prv_key);
} elseif (strlen($pub_key)) {
openssl_public_encrypt($hash, $challenge, $pub_key);
openssl_public_encrypt($id_str, $encrypted_id, $pub_key);
} else {
/// @TODO these kind of else-blocks are making the code harder to understand
$status = 1;
}
$challenge = bin2hex($challenge);
$encrypted_id = bin2hex($encrypted_id);
$rino = Config::get('system', 'rino_encrypt');
$rino = intval($rino);
Logger::log("Local rino version: ". $rino, Logger::DATA);
// if requested rino is lower than enabled local rino, lower local rino version
// if requested rino is higher than enabled local rino, reply with local rino
if ($rino_remote < $rino) {
$rino = $rino_remote;
}
if (($importer['rel'] && ($importer['rel'] != Contact::SHARING)) || ($importer['page-flags'] == Contact::PAGE_COMMUNITY)) {
$perm = 'rw';
} else {
$perm = 'r';
}
header("Content-type: text/xml");
echo '<?xml version="1.0" encoding="UTF-8"?>' . "\r\n"
. '<dfrn_notify>' . "\r\n"
. "\t" . '<status>' . $status . '</status>' . "\r\n"
. "\t" . '<dfrn_version>' . DFRN_PROTOCOL_VERSION . '</dfrn_version>' . "\r\n"
. "\t" . '<rino>' . $rino . '</rino>' . "\r\n"
. "\t" . '<perm>' . $perm . '</perm>' . "\r\n"
. "\t" . '<dfrn_id>' . $encrypted_id . '</dfrn_id>' . "\r\n"
. "\t" . '<challenge>' . $challenge . '</challenge>' . "\r\n"
. '</dfrn_notify>' . "\r\n";
killme();
}
}
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