friendica/mod/salmon.php

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<?php
/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program 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.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
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use Friendica\App;
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use Friendica\Core\Logger;
use Friendica\Core\Protocol;
use Friendica\Database\DBA;
use Friendica\DI;
use Friendica\Model\Contact;
use Friendica\Model\GServer;
use Friendica\Model\Post;
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use Friendica\Protocol\ActivityNamespace;
use Friendica\Protocol\OStatus;
use Friendica\Protocol\Salmon;
use Friendica\Util\Crypto;
use Friendica\Util\Network;
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use Friendica\Util\Strings;
function salmon_post(App $a, $xml = '') {
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if (empty($xml)) {
$xml = Network::postdata();
}
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Logger::log('new salmon ' . $xml, Logger::DATA);
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$nick = ((DI::args()->getArgc() > 1) ? Strings::escapeTags(trim(DI::args()->getArgv()[1])) : '');
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$importer = DBA::selectFirst('user', [], ['nickname' => $nick, 'account_expired' => false, 'account_removed' => false]);
if (! DBA::isResult($importer)) {
throw new \Friendica\Network\HTTPException\InternalServerErrorException();
}
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// parse the xml
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$dom = simplexml_load_string($xml,'SimpleXMLElement',0, ActivityNamespace::SALMON_ME);
$base = null;
// figure out where in the DOM tree our data is hiding
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if (!empty($dom->provenance->data))
$base = $dom->provenance;
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elseif (!empty($dom->env->data))
$base = $dom->env;
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elseif (!empty($dom->data))
$base = $dom;
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if (empty($base)) {
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Logger::log('unable to locate salmon data in xml ');
throw new \Friendica\Network\HTTPException\BadRequestException();
}
// Stash the signature away for now. We have to find their key or it won't be good for anything.
$signature = Strings::base64UrlDecode($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
$data = str_replace([" ","\t","\r","\n"],["","","",""],$base->data);
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// stash away some other stuff for later
$type = $base->data[0]->attributes()->type[0];
$keyhash = $base->sig[0]->attributes()->keyhash[0] ?? '';
$encoding = $base->encoding;
$alg = $base->alg;
// Salmon magic signatures have evolved and there is no way of knowing ahead of time which
// flavour we have. We'll try and verify it regardless.
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$stnet_signed_data = $data;
$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
$data = Strings::base64UrlDecode($data);
$author = OStatus::salmonAuthor($data, $importer);
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$author_link = $author["author-link"];
if(! $author_link) {
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Logger::log('Could not retrieve author URI.');
throw new \Friendica\Network\HTTPException\BadRequestException();
}
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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);
if(! $key) {
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Logger::log('Could not retrieve author key.');
throw new \Friendica\Network\HTTPException\BadRequestException();
}
$key_info = explode('.',$key);
$m = Strings::base64UrlDecode($key_info[1]);
$e = Strings::base64UrlDecode($key_info[2]);
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Logger::info('key details', ['info' => $key_info]);
$pubkey = Crypto::meToPem($m, $e);
// We should have everything we need now. Let's see if it verifies.
// Try GNU Social format
$verify = Crypto::rsaVerify($signed_data, $signature, $pubkey);
$mode = 1;
if (! $verify) {
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Logger::log('message did not verify using protocol. Trying compliant format.');
$verify = Crypto::rsaVerify($compliant_format, $signature, $pubkey);
$mode = 2;
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}
if (! $verify) {
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Logger::log('message did not verify using padding. Trying old statusnet format.');
$verify = Crypto::rsaVerify($stnet_signed_data, $signature, $pubkey);
$mode = 3;
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}
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if (! $verify) {
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Logger::log('Message did not verify. Discarding.');
throw new \Friendica\Network\HTTPException\BadRequestException();
}
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Logger::log('Message verified with mode '.$mode);
/*
*
* 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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$r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')
AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')
AND `uid` = %d LIMIT 1",
DBA::escape(Protocol::OSTATUS),
DBA::escape(Protocol::DFRN),
DBA::escape(Strings::normaliseLink($author_link)),
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DBA::escape($author_link),
DBA::escape(Strings::normaliseLink($author_link)),
intval($importer['uid'])
);
Cleanups: isResult() more used, readability improved (#5608) * [diaspora]: Maybe SimpleXMLElement is the right type-hint? * Changes proposed + pre-renaming: - pre-renamed $db -> $connection - added TODOs for not allowing bad method invocations (there is a BadMethodCallException in SPL) * If no record is found, below $r[0] will fail with a E_NOTICE and the code doesn't behave as expected. * Ops, one more left ... * Continued: - added documentation for Contact::updateSslPolicy() method - added type-hint for $contact of same method - empty lines added + TODO where the bug origins that $item has no element 'body' * Added empty lines for better readability * Cleaned up: - no more x() (deprecated) usage but empty() instead - fixed mixing of space/tab indending - merged else/if block goether in elseif() (lesser nested code blocks) * Re-fixed DBM -> DBA switch * Fixes/rewrites: - use empty()/isset() instead of deprecated x() - merged 2 nested if() blocks into one - avoided nested if() block inside else block by rewriting it to elseif() - $contact_id is an integer, let's test on > 0 here - added a lot spaces and some empty lines for better readability * Rewrite: - moved all CONTACT_* constants from boot.php to Contact class * CR request: - renamed Contact::CONTACT_IS_* -> Contact::* ;-) * Rewrites: - moved PAGE_* to Friendica\Model\Profile class - fixed mixure with "Contact::* rewrite" * Ops, one still there (return is no function) * Rewrite to Proxy class: - introduced new Friendica\Network\Proxy class for in exchange of proxy_*() functions - moved also all PROXY_* constants there as Proxy::* - removed now no longer needed mod/proxy.php loading as composer's auto-load will do this for us - renamed those proxy_*() functions to better names: + proxy_init() -> Proxy::init() (public) + proxy_url() -> Proxy::proxifyUrl() (public) + proxy_parse_html() -> Proxy::proxifyHtml() (public) + proxy_is_local_image() -> Proxy::isLocalImage() (private) + proxy_parse_query() -> Proxy::parseQuery() (private) + proxy_img_cb() -> Proxy::replaceUrl() (private) * CR request: - moved all PAGE_* constants to Friendica\Model\Contact class - fixed all references of both classes * Ops, need to set $a here ... * CR request: - moved Proxy class to Friendica\Module - extended BaseModule * Ops, no need for own instance of $a when self::getApp() is around. * Proxy-rewrite: - proxy_url() and proxy_parse_html() are both non-module functions (now methods) - so they must be splitted into a seperate class - also the SIZE_* and DEFAULT_TIME constants are both not relevant to module * No instances from utility classes * Fixed error: - proxify*() is now located in `Friendica\Util\ProxyUtils` * Moved back to original place, ops? How did they move here? Well, it was not intended by me. * Removed duplicate (left-over from split) constants and static array. Thank to MrPetovan finding it. * Renamed ProxyUtils -> Proxy and aliased it back to ProxyUtils. * Rewrite: - stopped using deprecated NETWORK_* constants, now Protocol::* should be used - still left them intact for slow/lazy developers ... * Ops, was added accidentally ... * Ops, why these wrong moves? * Ops, one to much (thanks to MrPetovan) * Ops, wrong moving ... * moved back to original place ... * spaces added * empty lines add for better readability. * convertered spaces -> tab for code indenting. * CR request: Add space between if and brace. * CR requests fixed + move reverted - ops, src/Module/*.php has been moved to src/Network/ accidentally - reverted some parts in src/Database/DBA.php as pointed out by Annando - removed internal TODO items - added some spaces for better readability
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if (!empty($r[0]['gsid'])) {
GServer::setProtocol($r[0]['gsid'], Post\DeliveryData::OSTATUS);
}
// Have we ignored the person?
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// If so we can not accept this post.
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if (DBA::isResult($r) && $r[0]['blocked']) {
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Logger::log('Ignoring this author.');
throw new \Friendica\Network\HTTPException\AcceptedException();
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}
// Placeholder for hub discovery.
$hub = '';
$contact_rec = ((DBA::isResult($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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}