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-rw-r--r--mod/salmon.php170
1 files changed, 163 insertions, 7 deletions
diff --git a/mod/salmon.php b/mod/salmon.php
index d68c74658..7ae29aafe 100644
--- a/mod/salmon.php
+++ b/mod/salmon.php
@@ -1,5 +1,15 @@
<?php
+
+// TODO: pass keyhash to key discovery
+// add relevant contacts so they can use this
+
+// 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('simplepie/simplepie.inc');
+
function salmon_return($val) {
if($val >= 500)
@@ -18,7 +28,7 @@ function salmon_post(&$a) {
$debugging = get_config('system','debugging');
if($debugging)
- file_put_contents('salmon.out',$xml,FILE_APPEND);
+ file_put_contents('salmon.out','New Salmon: ' . $xml . "\n",FILE_APPEND);
$nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : '');
$mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false);
@@ -31,22 +41,168 @@ function salmon_post(&$a) {
$importer = $r[0];
- require_once('include/items.php');
+ // parse the xml
+
+ $dom = simplexml_load_string($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 = $dom->provenance;
+ elseif($dom->env->data)
+ $base = $dom->env;
+ elseif($dom->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);
+ }
+
+ // 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.
+
+ // strip whitespace
+ $data = str_replace(array(" ","\t","\r","\n"),array("","","",""),$base->data);
+ $type = $base->data[0]->attributes()->type[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($debugging)
+ file_put_contents('salmon.out', "\n" . 'Signed data:>>>' . $signed_data . "<<<\n" , FILE_APPEND);
+
+ // 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');
+ $tpl = load_view_file('view/fake_feed.tpl');
- $base = substr($xml,strpos($xml,'<entry'));
+ $base = substr($data,strpos($data,'<entry'));
+
+ $feedxml = $tpl . $base . '</feed>';
+
+ if($debugging) {
+ file_put_contents('salmon.out', 'Processed feed: ' . $feedxml . "\n", FILE_APPEND);
+ }
+
+ // 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);
+ $feed->init();
+
+ if($debugging) {
+ file_put_contents('salmon.out', "\n" . 'Feed parsed.' . "\n", FILE_APPEND);
+ }
+
+
+ if($feed->get_item_quantity()) {
+ foreach($feed->get_items() as $item) {
+ $author = $item->get_author();
+ $author_link = unxmlify($author->get_link());
+ break;
+ }
+ }
+
+ if(! $author_link) {
+ if($debugging)
+ file_put_contents('salmon.out',"\n" . 'Could not retrieve author URI.' . "\n", FILE_APPEND);
+ salmon_return(500);
+ }
- $xml = $tpl . $base . '</feed>';
+ // Once we have the author URI, go to the web and find their public key
-salmon_return(500); // until the handler is finished
+ if($debugging) {
+ file_put_contents('salmon.out', "\n" . 'Fetching key for ' . $author_link . "\n", FILE_APPEND);
+ }
-// consume_salmon($xml,$importer);
+ $key = get_salmon_key($author_link,$keyhash);
+
+ if(! $key) {
+ if($debugging)
+ file_put_contents('salmon.out',"\n" . 'Could not retrieve author key.' . "\n", FILE_APPEND);
+ salmon_return(500);
+ }
+
+ // Setup RSA stuff to verify the signature
+
+ set_include_path(get_include_path() . PATH_SEPARATOR . 'phpsec');
+
+ require_once('phpsec/Crypt/RSA.php');
+
+ $key_info = explode('.',$key);
+
+ $m = base64url_decode($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);
+
+ $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);
+
+ // We should have everything we need now. Let's see if it verifies.
+
+ $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);
+ }
+
+ if($debugging)
+ file_put_contents('salmon.out',"\n" . 'Message verified.' . "\n", FILE_APPEND);
+
+
+ /*
+ *
+ * If we reached this point, the message is good. Now let's figure out if the author is allowed to send us stuff.
+ *
+ */
+
+ $r = q("SELECT * FROM `contact` WHERE `network` = 'stat' AND `lrdd` = '%s' AND `uid` = %d LIMIT 1",
+ dbesc($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);
+ }
+
+
+ require_once('include/items.php');
+
+ $hub = '';
+
+ consume_feed($feedxml,$importer,$r[0],$hub);
salmon_return(200);
}
+