206 lines
6.1 KiB
PHP
206 lines
6.1 KiB
PHP
<?php
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/**
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* @copyright Copyright (C) 2020, Friendica
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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\Contact;
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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::log('new salmon ' . $xml, Logger::DATA);
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$nick = (($a->argc > 1) ? Strings::escapeTags(trim($a->argv[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::log('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::log('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::log('Fetching key for ' . $author_link);
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$key = Salmon::getKey($author_link, $keyhash);
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if(! $key) {
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Logger::log('Could not retrieve author key.');
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throw new \Friendica\Network\HTTPException\BadRequestException();
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}
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$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 (! $verify) {
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Logger::log('message did not verify using protocol. Trying compliant format.');
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$verify = Crypto::rsaVerify($compliant_format, $signature, $pubkey);
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$mode = 2;
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}
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if (! $verify) {
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Logger::log('message did not verify using padding. Trying old statusnet format.');
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$verify = Crypto::rsaVerify($stnet_signed_data, $signature, $pubkey);
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$mode = 3;
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}
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if (! $verify) {
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Logger::log('Message did not verify. Discarding.');
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throw new \Friendica\Network\HTTPException\BadRequestException();
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}
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Logger::log('Message verified with mode '.$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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$r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')
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AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')
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AND `uid` = %d LIMIT 1",
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DBA::escape(Protocol::OSTATUS),
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DBA::escape(Protocol::DFRN),
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DBA::escape(Strings::normaliseLink($author_link)),
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DBA::escape($author_link),
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DBA::escape(Strings::normaliseLink($author_link)),
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intval($importer['uid'])
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);
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if (!DBA::isResult($r)) {
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Logger::log('Author ' . $author_link . ' unknown to user ' . $importer['uid'] . '.');
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if (DI::pConfig()->get($importer['uid'], 'system', 'ostatus_autofriend')) {
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$result = Contact::createFromProbe($importer, $author_link);
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if ($result['success']) {
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$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s')
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AND `uid` = %d LIMIT 1",
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DBA::escape(Protocol::OSTATUS),
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DBA::escape($author_link),
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DBA::escape($author_link),
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intval($importer['uid'])
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);
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}
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}
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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((DBA::isResult($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == Contact::FOLLOWER) || ($r[0]['blocked']))) {
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if (DBA::isResult($r) && $r[0]['blocked']) {
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Logger::log('Ignoring this author.');
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throw new \Friendica\Network\HTTPException\AcceptedException();
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}
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// Placeholder for hub discovery.
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$hub = '';
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$contact_rec = ((DBA::isResult($r)) ? $r[0] : []);
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OStatus::import($data, $importer, $contact_rec, $hub);
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throw new \Friendica\Network\HTTPException\OKException();
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}
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