<?php
-// TODO: pass keyhash to key discovery
+// TODO:
// add relevant contacts so they can use this
// There is a lot of debug stuff in here because this is quite a
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','New Salmon: ' . $xml . "\n",FILE_APPEND);
+
+ logger('mod-salmon: new salmon ' . $xml);
$nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
$mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
$dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME);
-
- if($debugging)
- file_put_contents('salmon.out', "\n" . print_r($dom,true) . "\n" , FILE_APPEND);
-
// figure out where in the DOM tree our data is hiding
if($dom->provenance->data)
$base = $dom;
if(! $base) {
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Unable to find salmon data in XML' . "\n" , FILE_APPEND);
- salmon_return(500);
+ logger('mod-salmon: unable to locate salmon data in xml ');
+ salmon_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);
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Encoded Signature: ' . $base->sig . "\n" , FILE_APPEND);
- // unpack our data element.
+ // unpack the data
- // strip whitespace
+ // 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 it
- $data = base64url_decode($data);
+ // If we're talking to status.net or one of their ilk, they aren't following the magic envelope spec
+ // and only signed the data element. We'll be nice and let them validate anyway.
- if($debugging)
- file_put_contents('salmon.out', "\n" . 'Signed data:>>>' . $signed_data . "<<<\n" , FILE_APPEND);
+ $stnet_signed_data = $data;
+ $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);
$feedxml = $tpl . $base . '</feed>';
- if($debugging) {
- file_put_contents('salmon.out', 'Processed feed: ' . $feedxml . "\n", FILE_APPEND);
- }
+ logger('mod-salmon: Processed feed: ' . $feedxml);
// Now parse it like a normal atom feed to scrape out the author URI
$feed->enable_order_by_date(false);
$feed->init();
- if($debugging) {
- file_put_contents('salmon.out', "\n" . 'Feed parsed.' . "\n", FILE_APPEND);
- }
-
+ logger('mod-salmon: Feed parsed.');
if($feed->get_item_quantity()) {
foreach($feed->get_items() as $item) {
}
if(! $author_link) {
- if($debugging)
- file_put_contents('salmon.out',"\n" . 'Could not retrieve author URI.' . "\n", FILE_APPEND);
- salmon_return(500);
+ logger('mod-salmon: Could not retrieve author URI.');
+ salmon_return(400);
}
- // Once we have the author URI, go to the web and find their public key
+ // Once we have the author URI, go to the web and try to find their public key
+
+ logger('mod-salmon: Fetching key for ' . $author_link );
- if($debugging) {
- file_put_contents('salmon.out', "\n" . 'Fetching key for ' . $author_link . "\n", FILE_APPEND);
- }
$key = get_salmon_key($author_link,$keyhash);
if(! $key) {
- if($debugging)
- file_put_contents('salmon.out',"\n" . 'Could not retrieve author key.' . "\n", FILE_APPEND);
- salmon_return(500);
+ logger('mod-salmon: Could not retrieve author key.');
+ salmon_return(400);
}
// Setup RSA stuff to verify the signature
$m = base64url_decode($key_info[1]);
$e = base64url_decode($key_info[2]);
- if($debugging)
- file_put_contents('salmon.out',"\n" . print_r($key_info,true) . "\n", FILE_APPEND);
+
+ logger('mod-salmon: key details: ' . print_r($key_info,true));
$rsa = new CRYPT_RSA();
$rsa->signatureMode = CRYPT_RSA_SIGNATURE_PKCS1;
$rsa->exponent = new Math_BigInteger($e, 256);
// We should have everything we need now. Let's see if it verifies.
+ // If it fails with the proper data format, try again using just the data
+ // (e.g. status.net)
$verify = $rsa->verify($signed_data,$signature);
if(! $verify) {
- if($debugging)
- file_put_contents('salmon.out',"\n" . 'Message did not verify. Discarding.' . "\n", FILE_APPEND);
- salmon_return(500);
+ logger('mod-salmon: message did not verify using protocol. Trying statusnet hack.');
+ $verify = $rsa->verify($stnet_signed_data,$signature);
+ }
+
+ if(! $verify) {
+ logger('mod-salmon: Message did not verify. Discarding.');
+ salmon_return(400);
}
- if($debugging)
- file_put_contents('salmon.out',"\n" . 'Message verified.' . "\n", FILE_APPEND);
+ logger('mod-salmon: Message verified.');
/*
*
*/
- $r = q("SELECT * FROM `contact` WHERE `network` = 'stat' AND `lrdd` = '%s' AND `uid` = %d LIMIT 1",
+ $r = q("SELECT * FROM `contact` WHERE `network` = 'stat' AND ( `url` = '%s' OR `alias` = '%s')
+ AND `uid` = %d LIMIT 1",
+ dbesc($author_link),
dbesc($author_link),
intval($importer['uid'])
);
if(! count($r)) {
- if($debugging)
- file_put_contents('salmon.out',"\n" . 'Author unknown to us.' . "\n", FILE_APPEND);
- salmon_return(500);
+ logger('mod-salmon: Author unknown to us.');
}
-
+ if((count($r)) && ($r[0]['readonly'])) {
+ logger('mod-salmon: Ignoring this author.');
+ salmon_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.
+
$hub = '';
- consume_feed($feedxml,$importer,$r[0],$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);
salmon_return(200);
}