2022-11-07 01:39:52 +00:00
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<?php
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/**
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2023-01-01 14:36:24 +00:00
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* @copyright Copyright (C) 2010-2023, the Friendica project
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2022-11-07 01:39:52 +00:00
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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*/
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namespace Friendica\Module\OStatus;
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use Friendica\App;
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use Friendica\Core\L10n;
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use Friendica\Core\Protocol;
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use Friendica\Database\Database;
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use Friendica\Model\GServer;
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use Friendica\Model\Post;
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use Friendica\Module\Response;
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use Friendica\Protocol\ActivityNamespace;
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use Friendica\Protocol\OStatus;
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use Friendica\Util\Crypto;
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use Friendica\Util\Network;
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use Friendica\Network\HTTPException;
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use Friendica\Protocol\Salmon as SalmonProtocol;
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use Friendica\Util\Profiler;
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use Friendica\Util\Strings;
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use Psr\Log\LoggerInterface;
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/**
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* Technical endpoint for the Salmon protocol
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*/
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class Salmon extends \Friendica\BaseModule
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{
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/** @var Database */
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private $database;
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public function __construct(Database $database, L10n $l10n, App\BaseURL $baseUrl, App\Arguments $args, LoggerInterface $logger, Profiler $profiler, Response $response, array $server, array $parameters = [])
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{
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parent::__construct($l10n, $baseUrl, $args, $logger, $profiler, $response, $server, $parameters);
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$this->database = $database;
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}
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/**
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* @param array $request
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* @return void
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* @throws HTTPException\AcceptedException
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* @throws HTTPException\BadRequestException
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* @throws HTTPException\InternalServerErrorException
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* @throws HTTPException\OKException
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* @throws \ImagickException
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*/
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protected function rawContent(array $request = [])
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{
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$xml = Network::postdata();
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$nickname = $this->parameters['nickname'] ?? '';
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2022-12-08 14:45:33 +00:00
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if (empty($nickname)) {
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throw new HTTPException\BadRequestException('nickname parameter is mandatory');
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}
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$this->logger->debug('New Salmon', ['nickname' => $nickname, 'xml' => $xml]);
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2022-11-07 01:39:52 +00:00
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$importer = $this->database->selectFirst('user', [], ['nickname' => $nickname, 'account_expired' => false, 'account_removed' => false]);
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if (!$this->database->isResult($importer)) {
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throw new HTTPException\InternalServerErrorException();
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}
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// parse the xml
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$dom = simplexml_load_string($xml, 'SimpleXMLElement', 0, ActivityNamespace::SALMON_ME);
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$base = null;
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// figure out where in the DOM tree our data is hiding
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if (!empty($dom->provenance->data)) {
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$base = $dom->provenance;
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} elseif (!empty($dom->env->data)) {
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$base = $dom->env;
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} elseif (!empty($dom->data)) {
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$base = $dom;
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}
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if (empty($base)) {
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$this->logger->notice('unable to locate salmon data in xml');
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throw new HTTPException\BadRequestException();
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}
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// Stash the signature away for now. We have to find their key or it won't be good for anything.
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$signature = Strings::base64UrlDecode($base->sig);
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// unpack the data
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// strip whitespace so our data element will return to one big base64 blob
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$data = str_replace([" ", "\t", "\r", "\n"], ["", "", "", ""], $base->data);
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// stash away some other stuff for later
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$type = $base->data[0]->attributes()->type[0];
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$keyhash = $base->sig[0]->attributes()->keyhash[0] ?? '';
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$encoding = $base->encoding;
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$alg = $base->alg;
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// Salmon magic signatures have evolved and there is no way of knowing ahead of time which
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// flavour we have. We'll try and verify it regardless.
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$stnet_signed_data = $data;
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$signed_data = $data . '.' . Strings::base64UrlEncode($type) . '.' . Strings::base64UrlEncode($encoding) . '.' . Strings::base64UrlEncode($alg);
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$compliant_format = str_replace('=', '', $signed_data);
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// decode the data
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$data = Strings::base64UrlDecode($data);
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$author = OStatus::salmonAuthor($data, $importer);
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$author_link = $author["author-link"];
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if (!$author_link) {
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$this->logger->notice('Could not retrieve author URI.');
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throw new HTTPException\BadRequestException();
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}
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// Once we have the author URI, go to the web and try to find their public key
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$this->logger->notice('Fetching key for ' . $author_link);
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$key = SalmonProtocol::getKey($author_link, $keyhash);
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if (!$key) {
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$this->logger->notice('Could not retrieve author key.');
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throw new HTTPException\BadRequestException();
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}
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2022-11-23 18:45:58 +00:00
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$this->logger->info('Key details', ['info' => $key]);
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2022-11-07 01:39:52 +00:00
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2022-11-23 18:45:58 +00:00
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$pubkey = SalmonProtocol::magicKeyToPem($key);
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2022-11-07 01:39:52 +00:00
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// We should have everything we need now. Let's see if it verifies.
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// Try GNU Social format
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$verify = Crypto::rsaVerify($signed_data, $signature, $pubkey);
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$mode = 1;
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if (!$verify) {
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$this->logger->notice('Message did not verify using protocol. Trying compliant format.');
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$verify = Crypto::rsaVerify($compliant_format, $signature, $pubkey);
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$mode = 2;
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}
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if (!$verify) {
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$this->logger->notice('Message did not verify using padding. Trying old statusnet format.');
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$verify = Crypto::rsaVerify($stnet_signed_data, $signature, $pubkey);
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$mode = 3;
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}
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if (!$verify) {
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$this->logger->notice('Message did not verify. Discarding.');
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throw new HTTPException\BadRequestException();
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}
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$this->logger->notice('Message verified with mode ' . $mode);
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/*
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*
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* If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
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*
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*/
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$contact = $this->database->selectFirst(
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'contact',
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[],
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[
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"`network` IN (?, ?)
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AND (`nurl` = ? OR `alias` = ? OR `alias` = ?)
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AND `uid` = ?",
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2022-11-07 12:54:12 +00:00
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Protocol::OSTATUS, Protocol::DFRN,
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2022-11-07 01:39:52 +00:00
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Strings::normaliseLink($author_link), $author_link, Strings::normaliseLink($author_link),
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$importer['uid']
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]
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);
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if (!empty($contact['gsid'])) {
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GServer::setProtocol($contact['gsid'], Post\DeliveryData::OSTATUS);
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}
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// Have we ignored the person?
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// If so we can not accept this post.
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if (!empty($contact['blocked'])) {
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$this->logger->notice('Ignoring this author.');
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throw new HTTPException\AcceptedException();
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}
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// Placeholder for hub discovery.
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$hub = '';
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$contact = $contact ?: [];
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OStatus::import($data, $importer, $contact, $hub);
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throw new HTTPException\OKException();
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}
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}
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