Remove mod/salmon.php
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Hypolite Petovan
parent
ec02664773
commit
9e315a75d8
183
mod/salmon.php
183
mod/salmon.php
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<?php
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/**
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* @copyright Copyright (C) 2010-2022, the Friendica project
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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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use Friendica\App;
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use Friendica\Core\Logger;
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use Friendica\Core\Protocol;
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use Friendica\Database\DBA;
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use Friendica\DI;
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use Friendica\Model\GServer;
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use Friendica\Model\Post;
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use Friendica\Protocol\ActivityNamespace;
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use Friendica\Protocol\OStatus;
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use Friendica\Protocol\Salmon;
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use Friendica\Util\Crypto;
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use Friendica\Util\Network;
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use Friendica\Util\Strings;
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function salmon_post(App $a, $xml = '') {
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if (empty($xml)) {
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$xml = Network::postdata();
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}
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Logger::debug('new salmon ' . $xml);
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$nick = trim(DI::args()->getArgv()[1] ?? '');
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$importer = DBA::selectFirst('user', [], ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false]);
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if (! DBA::isResult($importer)) {
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throw new \Friendica\Network\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 = $dom;
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if (empty($base)) {
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Logger::notice('unable to locate salmon data in xml');
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throw new \Friendica\Network\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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Logger::notice('Could not retrieve author URI.');
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throw new \Friendica\Network\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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Logger::notice('Fetching key for ' . $author_link);
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$key = Salmon::getKey($author_link, $keyhash);
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if(! $key) {
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Logger::notice('Could not retrieve author key.');
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throw new \Friendica\Network\HTTPException\BadRequestException();
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}
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$key_info = explode('.',$key);
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$m = Strings::base64UrlDecode($key_info[1]);
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$e = Strings::base64UrlDecode($key_info[2]);
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Logger::info('key details', ['info' => $key_info]);
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$pubkey = Crypto::meToPem($m, $e);
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// We should have everything we need now. Let's see if it verifies.
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// Try GNU Social format
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$verify = Crypto::rsaVerify($signed_data, $signature, $pubkey);
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$mode = 1;
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if (! $verify) {
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Logger::notice('message did not verify using protocol. Trying compliant format.');
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$verify = Crypto::rsaVerify($compliant_format, $signature, $pubkey);
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$mode = 2;
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}
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if (! $verify) {
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Logger::notice('message did not verify using padding. Trying old statusnet format.');
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$verify = Crypto::rsaVerify($stnet_signed_data, $signature, $pubkey);
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$mode = 3;
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}
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if (! $verify) {
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Logger::notice('Message did not verify. Discarding.');
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throw new \Friendica\Network\HTTPException\BadRequestException();
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}
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Logger::notice('Message verified with mode '.$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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$contact = DBA::selectFirst('contact', [], ["`network` IN (?, ?) AND (`nurl` = ? OR `alias` = ? OR `alias` = ?) AND `uid` = ?",
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Protocol::OSTATUS, Protocol::DFRN, Strings::normaliseLink($author_link), $author_link, Strings::normaliseLink($author_link), $importer['uid']]);
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if (!empty($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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Logger::notice('Ignoring this author.');
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throw new \Friendica\Network\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 \Friendica\Network\HTTPException\OKException();
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}
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