X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=mod%2Fsalmon.php;h=0264e820db2a03f224c512928170d2868cfce9b3;hb=6aa633efc829d4d3e9ccba4f6fb4d555f3c968ca;hp=d68c746584acb20ee3c83c06eefa9eb14dc44f0e;hpb=a0ecdd025eadf22142c7ed5018b930127ea10d9f;p=friendica.git diff --git a/mod/salmon.php b/mod/salmon.php index d68c746584..0264e820db 100644 --- a/mod/salmon.php +++ b/mod/salmon.php @@ -1,12 +1,21 @@ = 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 . ' ' . $err); killme(); @@ -15,10 +24,8 @@ function salmon_return($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 && $a->argv[2] === 'mention') ? true : false); @@ -27,26 +34,182 @@ function salmon_post(&$a) { 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'); + $tpl = get_markup_template('fake_feed.tpl'); + + $base = substr($data,strpos($data,''; + + logger('mod-salmon: Processed feed: ' . $feedxml); + + // Now parse it like a normal atom feed to scrape out the author URI - $base = substr($xml,strpos($xml,'set_raw_data($feedxml); + $feed->enable_order_by_date(false); + $feed->init(); - $xml = $tpl . $base . ''; + logger('mod-salmon: Feed parsed.'); -salmon_return(500); // until the handler is finished + if($feed->get_item_quantity()) { + foreach($feed->get_items() as $item) { + $author = $item->get_author(); + $author_link = unxmlify($author->get_link()); + break; + } + } -// consume_salmon($xml,$importer); + if(! $author_link) { + logger('mod-salmon: Could not retrieve author URI.'); + http_status_exit(400); + } - salmon_return(200); + // 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. + * + */ + + $r = q("SELECT * FROM `contact` WHERE `network` = 'stat' AND ( `url` = '%s' OR `alias` = '%s') + AND `uid` = %d LIMIT 1", + dbesc($author_link), + dbesc($author_link), + intval($importer['uid']) + ); + if(! count($r)) { + logger('mod-salmon: Author unknown to us.'); + } + + // is this a follower? Or have we ignored the person? + // If so we can not accept this post. + + if((count($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); } +