mirror of
https://github.com/friendica/friendica
synced 2024-11-14 02:43:43 +01:00
diaspora salmon endpoint (decryption not yet provided)
This commit is contained in:
Friendika
parent
bf1739aef2
commit
e2f22a1827
215
mod/receive.php
Normal file
215
mod/receive.php
Normal file
|
|
@ -0,0 +1,215 @@
|
|||
<?php
|
||||
|
||||
/**
|
||||
* Diaspora endpoint
|
||||
*/
|
||||
|
||||
|
||||
|
||||
require_once('include/salmon.php');
|
||||
require_once('library/simplepie/simplepie.inc');
|
||||
|
||||
function receive_return($val) {
|
||||
|
||||
if($val >= 400)
|
||||
$err = 'Error';
|
||||
if($val >= 200 && $val < 300)
|
||||
$err = 'OK';
|
||||
|
||||
logger('mod-diaspora returns ' . $val);
|
||||
header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
|
||||
killme();
|
||||
|
||||
}
|
||||
|
||||
function receive_post(&$a) {
|
||||
|
||||
if($a->argc != 3 || $a->argv[1] !== 'users')
|
||||
receive_return(500);
|
||||
|
||||
$guid = $a->argv[2];
|
||||
|
||||
$r = q("SELECT * FROM `user` WHERE `guid` = '%s' LIMIT 1",
|
||||
dbesc($guid)
|
||||
);
|
||||
if(! count($r))
|
||||
salmon_return(500);
|
||||
|
||||
$importer = $r[0];
|
||||
|
||||
$xml = $_POST['xml'];
|
||||
|
||||
logger('mod-diaspora: new salmon ' . $xml, LOGGER_DATA);
|
||||
|
||||
if(! $xml)
|
||||
receive_return(500);
|
||||
|
||||
// parse the xml
|
||||
|
||||
$dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
|
||||
|
||||
// figure out where in the DOM tree our data is hiding
|
||||
|
||||
if($dom->provenance->data)
|
||||
$base = $dom->provenance;
|
||||
elseif($dom->env->data)
|
||||
$base = $dom->env;
|
||||
elseif($dom->data)
|
||||
$base = $dom;
|
||||
|
||||
if(! $base) {
|
||||
logger('mod-diaspora: unable to locate salmon data in xml ');
|
||||
receive_return(400);
|
||||
}
|
||||
|
||||
// Stash the signature away for now. We have to find their key or it won't be good for anything.
|
||||
$signature = base64url_decode($base->sig);
|
||||
|
||||
// unpack the data
|
||||
|
||||
// strip whitespace so our data element will return to one big base64 blob
|
||||
$data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
|
||||
|
||||
// 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;
|
||||
|
||||
$signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
|
||||
|
||||
// decode the data
|
||||
$data = base64url_decode($data);
|
||||
|
||||
// Remove the xml declaration
|
||||
$data = preg_replace('/\<\?xml[^\?].*\?\>/','',$data);
|
||||
|
||||
// Create a fake feed wrapper so simplepie doesn't choke
|
||||
|
||||
$tpl = get_markup_template('fake_feed.tpl');
|
||||
|
||||
$base = substr($data,strpos($data,'<entry'));
|
||||
|
||||
$feedxml = $tpl . $base . '</feed>';
|
||||
|
||||
logger('mod-diaspora: Processed feed: ' . $feedxml);
|
||||
|
||||
// Now parse it like a normal atom feed to scrape out the author URI
|
||||
|
||||
$feed = new SimplePie();
|
||||
$feed->set_raw_data($feedxml);
|
||||
$feed->enable_order_by_date(false);
|
||||
$feed->init();
|
||||
|
||||
logger('mod-diaspora: Feed parsed.');
|
||||
|
||||
if($feed->get_item_quantity()) {
|
||||
foreach($feed->get_items() as $item) {
|
||||
$author = $item->get_author();
|
||||
$author_link = unxmlify($author->get_link());
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if(! $author_link) {
|
||||
logger('mod-diaspora: Could not retrieve author URI.');
|
||||
receive_return(400);
|
||||
}
|
||||
|
||||
// Once we have the author URI, go to the web and try to find their public key
|
||||
|
||||
logger('mod-salmon: Fetching key for ' . $author_link );
|
||||
|
||||
|
||||
$key = get_salmon_key($author_link,$keyhash);
|
||||
|
||||
if(! $key) {
|
||||
logger('mod-salmon: Could not retrieve author key.');
|
||||
receive_return(400);
|
||||
}
|
||||
|
||||
// Setup RSA stuff to verify the signature
|
||||
|
||||
set_include_path(get_include_path() . PATH_SEPARATOR . 'library' . PATH_SEPARATOR . 'phpsec');
|
||||
|
||||
require_once('library/phpsec/Crypt/RSA.php');
|
||||
|
||||
$key_info = explode('.',$key);
|
||||
|
||||
$m = base64url_decode($key_info[1]);
|
||||
$e = base64url_decode($key_info[2]);
|
||||
|
||||
logger('mod-salmon: key details: ' . print_r($key_info,true));
|
||||
|
||||
$rsa = new CRYPT_RSA();
|
||||
$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
|
||||
$rsa->setHash('sha256');
|
||||
|
||||
$rsa->modulus = new Math_BigInteger($m, 256);
|
||||
$rsa->k = strlen($rsa->modulus->toBytes());
|
||||
$rsa->exponent = new Math_BigInteger($e, 256);
|
||||
|
||||
$verify = $rsa->verify($signed_data,$signature);
|
||||
|
||||
if(! $verify) {
|
||||
logger('mod-diaspora: Message did not verify. Discarding.');
|
||||
receive_return(400);
|
||||
}
|
||||
|
||||
logger('mod-diaspora: Message verified.');
|
||||
|
||||
/* decrypt the sucker */
|
||||
/*
|
||||
// TODO
|
||||
*/
|
||||
|
||||
/*
|
||||
*
|
||||
* If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
|
||||
*
|
||||
*/
|
||||
|
||||
$r = q("SELECT * FROM `contact` WHERE `network` = 'dspr' AND ( `url` = '%s' OR `alias` = '%s')
|
||||
AND `uid` = %d LIMIT 1",
|
||||
dbesc($author_link),
|
||||
dbesc($author_link),
|
||||
intval($importer['uid'])
|
||||
);
|
||||
if(! count($r)) {
|
||||
logger('mod-diaspora: Author unknown to us.');
|
||||
}
|
||||
|
||||
// is this a follower? Or have we ignored the person?
|
||||
// If so we can not accept this post.
|
||||
|
||||
if((count($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == REL_VIP) || ($r[0]['blocked']))) {
|
||||
logger('mod-diaspora: Ignoring this author.');
|
||||
receive_return(202);
|
||||
// NOTREACHED
|
||||
}
|
||||
|
||||
require_once('include/items.php');
|
||||
|
||||
// Placeholder for hub discovery. We shouldn't find any hubs
|
||||
// since we supplied the fake feed header - and it doesn't have any.
|
||||
|
||||
$hub = '';
|
||||
|
||||
/**
|
||||
*
|
||||
* anti-spam measure: consume_feed will accept a follow activity from
|
||||
* this person (and nothing else) if there is no existing contact record.
|
||||
*
|
||||
*/
|
||||
|
||||
$contact_rec = ((count($r)) ? $r[0] : null);
|
||||
|
||||
consume_feed($feedxml,$importer,$contact_rec,$hub);
|
||||
|
||||
receive_return(200);
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in a new issue