<?php
+
+// There is a lot of debug stuff in here because this is quite a
+// complicated process to try and sort out.
+
+require_once('include/salmon.php');
+require_once('include/crypto.php');
+require_once('library/simplepie/simplepie.inc');
+
function salmon_return($val) {
- if($val >= 500)
+ if($val >= 400)
$err = 'Error';
- if($val == 200)
+ if($val >= 200 && $val < 300)
$err = 'OK';
-
+
+ logger('mod-salmon returns ' . $val);
header($_SERVER["SERVER_PROTOCOL"] . ' ' . $val . ' ' . $err);
killme();
function salmon_post(&$a) {
$xml = file_get_contents('php://input');
-
- $debugging = get_config('system','debugging');
- if($debugging)
- file_put_contents('salmon.out',$xml,FILE_APPEND);
+
+ logger('mod-salmon: new salmon ' . $xml, LOGGER_DATA);
$nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
$mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
- $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' LIMIT 1",
+ $r = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1",
dbesc($nick)
);
if(! count($r))
- salmon_return(500);
+ http_status_exit(500);
$importer = $r[0];
- require_once('include/items.php');
+ // 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-salmon: unable to locate salmon data in xml ');
+ http_status_exit(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;
+
+ // 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.
+
+ $stnet_signed_data = $data;
+
+ $signed_data = $data . '.' . base64url_encode($type) . '.' . base64url_encode($encoding) . '.' . base64url_encode($alg);
+
+ $compliant_format = str_replace('=','',$signed_data);
+
+
+ // 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 = load_view_file('view/atom_feed.tpl');
-
- $base = substr($xml,strpos($xml,'<entry'));
+ $tpl = get_markup_template('fake_feed.tpl');
- $xml = $tpl . $base . '</feed>';
+ $base = substr($data,strpos($data,'<entry'));
-salmon_return(500); // until the handler is finished
+ $feedxml = $tpl . $base . '</feed>';
-// consume_salmon($xml,$importer);
+ logger('mod-salmon: Processed feed: ' . $feedxml);
- salmon_return(200);
-}
+ // 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);
+ $feed->init();
+
+ logger('mod-salmon: Feed parsed.');
+ if($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-salmon: Could not retrieve author URI.');
+ http_status_exit(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.');
+ http_status_exit(400);
+ }
+
+ $key_info = explode('.',$key);
+
+ $m = base64url_decode($key_info[1]);
+ $e = base64url_decode($key_info[2]);
+
+ logger('mod-salmon: key details: ' . print_r($key_info,true), LOGGER_DEBUG);
+
+ $pubkey = metopem($m,$e);
+
+ // We should have everything we need now. Let's see if it verifies.
+
+ $verify = rsa_verify($compliant_format,$signature,$pubkey);
+
+ if(! $verify) {
+ logger('mod-salmon: message did not verify using protocol. Trying padding hack.');
+ $verify = rsa_verify($signed_data,$signature,$pubkey);
+ }
+
+ if(! $verify) {
+ logger('mod-salmon: message did not verify using padding. Trying old statusnet hack.');
+ $verify = rsa_verify($stnet_signed_data,$signature,$pubkey);
+ }
+
+ if(! $verify) {
+ logger('mod-salmon: Message did not verify. Discarding.');
+ http_status_exit(400);
+ }
+
+ logger('mod-salmon: Message verified.');
+
+
+ /*
+ *
+ * If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
+ *
+ */
+
+ $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s' )
+ AND `uid` = %d LIMIT 1",
+ dbesc(NETWORK_OSTATUS),
+ dbesc($author_link),
+ dbesc($author_link),
+ intval($importer['uid'])
+ );
+ if(! count($r)) {
+ logger('mod-salmon: Author unknown to us.');
+ if(get_pconfig($importer['uid'],'system','ostatus_autofriend')) {
+ require_once('include/follow.php');
+ $result = new_contact($importer['uid'],$author_link);
+ if($result['success']) {
+ $r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s' )
+ AND `uid` = %d LIMIT 1",
+ dbesc(NETWORK_OSTATUS),
+ dbesc($author_link),
+ dbesc($author_link),
+ intval($importer['uid'])
+ );
+ }
+ }
+ }
+
+ // is this a follower? Or have we ignored the person?
+ // If so we can not accept this post.
+
+ if((count($r)) && (($r[0]['readonly']) || ($r[0]['rel'] == CONTACT_IS_FOLLOWER) || ($r[0]['blocked']))) {
+ logger('mod-salmon: Ignoring this author.');
+ http_status_exit(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);
+
+ http_status_exit(200);
+}
projects / friendica.git / blobdiff