gnu-social/plugins/ActivityPub/actions/apinbox.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
/**
* ActivityPub implementation for GNU social
*
* @package GNUsocial
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*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*
* @see http://www.gnu.org/software/social/
*/
defined('GNUSOCIAL') || die();
/**
* Inbox Request Handler
*
* @category Plugin
* @package GNUsocial
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*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class apInboxAction extends ManagedAction
{
protected $needLogin = false;
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protected $canPost = true;
/**
* Handle the Inbox request
*
* @throws ServerException
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*
* @return void
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
protected function handle()
{
$path = !empty($this->trimmed('id')) ? common_local_url('apInbox', ['id' => $this->trimmed('id')]) : common_local_url('apInbox');
$path = parse_url($path, PHP_URL_PATH);
if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
ActivityPubReturn::error('Only POST requests allowed.');
}
common_debug('ActivityPub Inbox: Received a POST request.');
$body = $data = file_get_contents('php://input');
common_debug('ActivityPub Inbox: Request contents: ' . $data);
$data = json_decode(file_get_contents('php://input'), true);
if (!isset($data['actor'])) {
ActivityPubReturn::error('Actor not found in the request.');
}
try {
$actor = Activitypub_explorer::get_profile_from_url($data['actor']);
} catch (HTTP_Request2_Exception $e) {
ActivityPubReturn::error('Failed to retrieve remote actor information.');
} catch (NoProfileException $e) {
// Assert: This won't happen.
common_log(LOG_ERR, 'PLEASE REPORT THIS: ActivityPub Inbox Handler failed with NoProfileException while retrieving remote actor information: ' . $e->getMessage());
ActivityPubReturn::error('An unknown error has occurred. This was logged, please alert the sysadmin.');
} catch (ServerException $e) {
ActivityPubReturn::error('Could not store this remote actor.');
} catch (Exception $e) {
ActivityPubReturn::error('Invalid actor.');
}
try {
$aprofile = Activitypub_profile::from_profile($actor);
} catch (Exception $e) {
// Assert: This won't happen.
common_log(LOG_ERR, 'PLEASE REPORT THIS: ActivityPub Inbox Handler failed while retrieving AProfile from Profile: ' . $e->getMessage());
ActivityPubReturn::error('An unknown error has occurred. This was logged, please alert the sysadmin.');
}
$actor_public_key = new Activitypub_rsa();
$actor_public_key = $actor_public_key->ensure_public_key($actor);
common_debug('ActivityPub Inbox: HTTP Signature: Validation will now start!');
$headers = getallheaders();
common_debug('ActivityPub Inbox: Request Headers: ' . print_r($headers, true));
if (!isset($headers['Signature'])) {
common_debug('ActivityPub Inbox: HTTP Signature: Missing Signature header.');
ActivityPubReturn::error('Missing Signature header.', 400);
}
// Extract the signature properties
$signatureData = HTTPSignature::parseSignatureHeader($headers['Signature']);
common_debug('ActivityPub Inbox: HTTP Signature Data: ' . print_r($signatureData, true));
if (isset($signatureData['error'])) {
common_debug('ActivityPub Inbox: HTTP Signature: ' . json_encode($signatureData, true));
ActivityPubReturn::error(json_encode($signatureData, true), 400);
}
list($verified, /*$headers*/) = HTTPSignature::verify($actor_public_key, $signatureData, $headers, $path, $body);
// If the signature fails verification the first time, update profile as it might have changed public key
if ($verified !== 1) {
try {
$res = Activitypub_explorer::get_remote_user_activity($aprofile->getUri());
} catch (Exception $e) {
ActivityPubReturn::error('Invalid remote actor.');
}
try {
$actor = Activitypub_profile::update_profile($aprofile, $res);
} catch (Exception $e) {
ActivityPubReturn::error('Failed to updated remote actor information.');
}
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$actor_public_key = new Activitypub_rsa();
$actor_public_key = $actor_public_key->ensure_public_key($actor);
list($verified, /*$headers*/) = HTTPSignature::verify($actor_public_key, $signatureData, $headers, $path, $body);
}
// If it still failed despite profile update
if ($verified !== 1) {
common_debug('ActivityPub Inbox: HTTP Signature: Invalid signature.');
ActivityPubReturn::error('Invalid signature.');
}
// HTTP signature checked out, make sure the "actor" of the activity matches that of the signature
common_debug('ActivityPub Inbox: HTTP Signature: Authorized request. Will now start the inbox handler.');
try {
new Activitypub_inbox_handler($data, $actor);
ActivityPubReturn::answer();
} catch (Exception $e) {
ActivityPubReturn::error($e->getMessage());
}
}
}