kopia lustrzana https://github.com/friendica/friendica
200 wiersze
5.2 KiB
PHP
200 wiersze
5.2 KiB
PHP
<?php
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/**
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* @file mod/salmon.php
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*/
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use Friendica\App;
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use Friendica\Core\PConfig;
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use Friendica\Database\DBM;
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use Friendica\Model\Contact;
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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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require_once 'include/items.php';
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function salmon_return($val) {
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if($val >= 400)
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$err = 'Error';
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if($val >= 200 && $val < 300)
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$err = 'OK';
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logger('mod-salmon returns ' . $val);
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header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
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killme();
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}
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function salmon_post(App $a) {
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$xml = file_get_contents('php://input');
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logger('mod-salmon: new salmon ' . $xml, LOGGER_DATA);
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$nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
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$mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
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$r = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
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dbesc($nick)
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);
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if (! DBM::is_result($r)) {
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Network::httpStatusExit(500);
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}
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$importer = $r[0];
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// parse the xml
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$dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
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// figure out where in the DOM tree our data is hiding
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if($dom->provenance->data)
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$base = $dom->provenance;
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elseif($dom->env->data)
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$base = $dom->env;
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elseif($dom->data)
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$base = $dom;
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if(! $base) {
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logger('mod-salmon: unable to locate salmon data in xml ');
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Network::httpStatusExit(400);
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}
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// Stash the signature away for now. We have to find their key or it won't be good for anything.
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$signature = base64url_decode($base->sig);
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// unpack the data
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// strip whitespace so our data element will return to one big base64 blob
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$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 = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
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$compliant_format = str_replace('=', '', $signed_data);
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// decode the data
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$data = base64url_decode($data);
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$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('mod-salmon: Could not retrieve author URI.');
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Network::httpStatusExit(400);
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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('mod-salmon: Fetching key for ' . $author_link);
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$key = Salmon::getKey($author_link, $keyhash);
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if(! $key) {
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logger('mod-salmon: Could not retrieve author key.');
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Network::httpStatusExit(400);
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}
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$key_info = explode('.',$key);
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$m = base64url_decode($key_info[1]);
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$e = base64url_decode($key_info[2]);
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logger('mod-salmon: key details: ' . print_r($key_info,true), LOGGER_DEBUG);
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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 (! $verify) {
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logger('mod-salmon: message did not verify using protocol. Trying compliant format.');
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$verify = Crypto::rsaVerify($compliant_format, $signature, $pubkey);
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$mode = 2;
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}
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if (! $verify) {
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logger('mod-salmon: message did not verify using padding. Trying old statusnet format.');
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$verify = Crypto::rsaVerify($stnet_signed_data, $signature, $pubkey);
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$mode = 3;
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}
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if (! $verify) {
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logger('mod-salmon: Message did not verify. Discarding.');
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Network::httpStatusExit(400);
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}
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logger('mod-salmon: Message verified with mode '.$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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$r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')
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AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')
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AND `uid` = %d LIMIT 1",
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dbesc(NETWORK_OSTATUS),
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dbesc(NETWORK_DFRN),
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dbesc(normalise_link($author_link)),
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dbesc($author_link),
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dbesc(normalise_link($author_link)),
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intval($importer['uid'])
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);
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if (! DBM::is_result($r)) {
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logger('mod-salmon: Author unknown to us.');
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if(PConfig::get($importer['uid'],'system','ostatus_autofriend')) {
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$result = Contact::createFromProbe($importer['uid'], $author_link);
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if($result['success']) {
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$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s')
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AND `uid` = %d LIMIT 1",
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dbesc(NETWORK_OSTATUS),
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dbesc($author_link),
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dbesc($author_link),
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intval($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((DBM::is_result($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == CONTACT_IS_FOLLOWER) || ($r[0]['blocked']))) {
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if (DBM::is_result($r) && $r[0]['blocked']) {
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logger('mod-salmon: Ignoring this author.');
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Network::httpStatusExit(202);
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// NOTREACHED
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}
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// Placeholder for hub discovery.
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$hub = '';
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$contact_rec = ((DBM::is_result($r)) ? $r[0] : null);
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OStatus::import($data, $importer, $contact_rec, $hub);
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Network::httpStatusExit(200);
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}
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