X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=mod%2Fsalmon.php;h=37230a557351ad70e9b4faada55a17a89f6ef69e;hb=e4ec867df3377acbec6325e7023b814129981d31;hp=d68c746584acb20ee3c83c06eefa9eb14dc44f0e;hpb=a0ecdd025eadf22142c7ed5018b930127ea10d9f;p=friendica.git diff --git a/mod/salmon.php b/mod/salmon.php index d68c746584..37230a5573 100644 --- a/mod/salmon.php +++ b/mod/salmon.php @@ -1,12 +1,19 @@ = 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 . ' ' . $err); killme(); @@ -15,38 +22,166 @@ function salmon_return($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, 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 - // Create a fake feed wrapper so simplepie doesn't choke + $dom = simplexml_load_string($xml,'SimpleXMLElement',0,NAMESPACE_SALMON_ME); - $tpl = load_view_file('view/atom_feed.tpl'); - - $base = substr($xml,strpos($xml,''; + if($dom->provenance->data) + $base = $dom->provenance; + elseif($dom->env->data) + $base = $dom->env; + elseif($dom->data) + $base = $dom; -salmon_return(500); // until the handler is finished + if(! $base) { + logger('mod-salmon: unable to locate salmon data in xml '); + http_status_exit(400); + } -// consume_salmon($xml,$importer); + // Stash the signature away for now. We have to find their key or it won't be good for anything. - salmon_return(200); -} + $signature = base64url_decode($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); + + $author = ostatus::salmon_author($data,$importer); + $author_link = $author["author-link"]; + + 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. + * + */ + + $r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s') + AND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s') + AND `uid` = %d LIMIT 1", + dbesc(NETWORK_OSTATUS), + dbesc(NETWORK_DFRN), + dbesc(normalise_link($author_link)), + dbesc($author_link), + dbesc(normalise_link($author_link)), + intval($importer['uid']) + ); + if(! count($r)) { + logger('mod-salmon: Author unknown to us.'); + if(get_pconfig($importer['uid'],'system','ostatus_autofriend')) { + $result = new_contact($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']) + ); + } + } + } + + // 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']))) { + if(count($r) && $r[0]['blocked']) { + logger('mod-salmon: Ignoring this author.'); + http_status_exit(202); + // NOTREACHED + } + + // Placeholder for hub discovery. + $hub = ''; + + $contact_rec = ((count($r)) ? $r[0] : null); + + ostatus::import($data,$importer,$contact_rec, $hub); + + http_status_exit(200); +}