X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=mod%2Fsalmon.php;h=885ba470c8458e64a8456f9015e52c2cbfd2da82;hb=8c245a5d2f4e6882211ac17561f86537a7089c73;hp=d68c746584acb20ee3c83c06eefa9eb14dc44f0e;hpb=a0ecdd025eadf22142c7ed5018b930127ea10d9f;p=friendica.git diff --git a/mod/salmon.php b/mod/salmon.php index d68c746584..885ba470c8 100644 --- a/mod/salmon.php +++ b/mod/salmon.php @@ -1,12 +1,23 @@ = 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 . ' ' . $err); killme(); @@ -15,10 +26,8 @@ function salmon_return($val) { 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); $nick = (($a->argc > 1) ? notags(trim($a->argv[1])) : ''); $mentions = (($a->argc > 2 && $a->argv[2] === 'mention') ? true : false); @@ -31,22 +40,179 @@ function salmon_post(&$a) { $importer = $r[0]; - require_once('include/items.php'); + // parse the xml + + $dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME); + + // 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 '); + 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); + + // 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; + + // 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. + + $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); // 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,''; + + logger('mod-salmon: 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-salmon: Feed parsed.'); - $xml = $tpl . $base . ''; + if($feed->get_item_quantity()) { + foreach($feed->get_items() as $item) { + $author = $item->get_author(); + $author_link = unxmlify($author->get_link()); + break; + } + } -salmon_return(500); // until the handler is finished + if(! $author_link) { + logger('mod-salmon: Could not retrieve author URI.'); + salmon_return(400); + } -// consume_salmon($xml,$importer); + // 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.'); + salmon_return(400); + } + + // 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]); + + 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); + + // 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) { + 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); + } + + 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. + * + */ + + $r = q("SELECT * FROM `contact` WHERE `network` = 'stat' AND ( `url` = '%s' OR `alias` = '%s') + AND `uid` = %d LIMIT 1", + dbesc($author_link), + dbesc($author_link), + intval($importer['uid']) + ); + if(! count($r)) { + logger('mod-salmon: Author unknown to us.'); + } + if((count($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 = ''; + + /** + * + * 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); } +