diaspora salmon endpoint (decryption not yet provided)
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Friendika
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215
mod/receive.php
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215
mod/receive.php
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<?php
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/**
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* Diaspora endpoint
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*/
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require_once('include/salmon.php');
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require_once('library/simplepie/simplepie.inc');
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function receive_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-diaspora returns ' . $val);
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header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
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killme();
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}
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function receive_post(&$a) {
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if($a->argc != 3 || $a->argv[1] !== 'users')
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receive_return(500);
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$guid = $a->argv[2];
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$r = q("SELECT * FROM `user` WHERE `guid` = '%s' LIMIT 1",
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dbesc($guid)
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);
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if(! count($r))
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salmon_return(500);
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$importer = $r[0];
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$xml = $_POST['xml'];
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logger('mod-diaspora: new salmon ' . $xml, LOGGER_DATA);
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if(! $xml)
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receive_return(500);
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// parse the xml
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$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(! $base) {
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logger('mod-diaspora: unable to locate salmon data in xml ');
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receive_return(400);
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}
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// Stash the signature away for now. We have to find their key or it won't be good for anything.
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$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(array(" ","\t","\r","\n"),array("","","",""),$base->data);
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// stash away some other stuff for later
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$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 = $base->alg;
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$signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
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// decode the data
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$data = base64url_decode($data);
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// Remove the xml declaration
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$data = preg_replace('/\<\?xml[^\?].*\?\>/','',$data);
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// Create a fake feed wrapper so simplepie doesn't choke
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$tpl = get_markup_template('fake_feed.tpl');
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$base = substr($data,strpos($data,'<entry'));
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$feedxml = $tpl . $base . '</feed>';
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logger('mod-diaspora: Processed feed: ' . $feedxml);
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// Now parse it like a normal atom feed to scrape out the author URI
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$feed = new SimplePie();
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$feed->set_raw_data($feedxml);
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$feed->enable_order_by_date(false);
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$feed->init();
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logger('mod-diaspora: Feed parsed.');
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if($feed->get_item_quantity()) {
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foreach($feed->get_items() as $item) {
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$author = $item->get_author();
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$author_link = unxmlify($author->get_link());
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break;
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}
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}
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if(! $author_link) {
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logger('mod-diaspora: Could not retrieve author URI.');
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receive_return(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 = get_salmon_key($author_link,$keyhash);
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if(! $key) {
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logger('mod-salmon: Could not retrieve author key.');
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receive_return(400);
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}
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// Setup RSA stuff to verify the signature
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set_include_path(get_include_path() . PATH_SEPARATOR . 'library' . PATH_SEPARATOR . 'phpsec');
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require_once('library/phpsec/Crypt/RSA.php');
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$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));
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$rsa = new CRYPT_RSA();
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$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
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$rsa->setHash('sha256');
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$rsa->modulus = new Math_BigInteger($m, 256);
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$rsa->k = strlen($rsa->modulus->toBytes());
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$rsa->exponent = new Math_BigInteger($e, 256);
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$verify = $rsa->verify($signed_data,$signature);
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if(! $verify) {
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logger('mod-diaspora: Message did not verify. Discarding.');
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receive_return(400);
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}
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logger('mod-diaspora: Message verified.');
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/* decrypt the sucker */
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/*
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// TODO
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*/
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/*
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*
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* If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
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*
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*/
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$r = q("SELECT * FROM `contact` WHERE `network` = 'dspr' AND ( `url` = '%s' OR `alias` = '%s')
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AND `uid` = %d LIMIT 1",
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dbesc($author_link),
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dbesc($author_link),
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intval($importer['uid'])
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);
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if(! count($r)) {
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logger('mod-diaspora: Author unknown to us.');
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}
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// is this a follower? Or have we ignored the person?
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// If so we can not accept this post.
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if((count($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == REL_VIP) || ($r[0]['blocked']))) {
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logger('mod-diaspora: Ignoring this author.');
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receive_return(202);
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// NOTREACHED
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}
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require_once('include/items.php');
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// Placeholder for hub discovery. We shouldn't find any hubs
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// since we supplied the fake feed header - and it doesn't have any.
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$hub = '';
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/**
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*
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* anti-spam measure: consume_feed will accept a follow activity from
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* this person (and nothing else) if there is no existing contact record.
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*
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*/
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$contact_rec = ((count($r)) ? $r[0] : null);
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consume_feed($feedxml,$importer,$contact_rec,$hub);
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receive_return(200);
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}
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