function salmon_post(&$a)
{
$xml = file_get_contents('php://input');
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;
$r = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1", dbesc($nick));
if (!count($r)) {
http_status_exit(500);
}
$importer = $r[0];
// 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);
$author = ostatus_salmon_author($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.
*
*/
$r = q("SELECT * FROM `contact` WHERE `network` IN ('%s', '%s')\n\t\t\t\t\t\tAND (`nurl` = '%s' OR `alias` = '%s' OR `alias` = '%s')\n\t\t\t\t\t\tAND `uid` = %d LIMIT 1", dbesc(NETWORK_OSTATUS), dbesc(NETWORK_DFRN), dbesc(normalise_link($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']) {
$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s') \n\t\t\t\t\tAND `uid` = %d LIMIT 1", dbesc(NETWORK_OSTATUS), dbesc($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, $hub);
http_status_exit(200);
}
function rsatopem($key)
{
pubrsatome($key, $m, $e);
return metopem($m, $e);
}
function salmon_post(&$a)
{
$xml = file_get_contents('php://input');
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;
$r = q("SELECT * FROM `user` WHERE `nickname` = '%s' AND `account_expired` = 0 AND `account_removed` = 0 LIMIT 1", dbesc($nick));
if (!count($r)) {
http_status_exit(500);
}
$importer = $r[0];
// 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 = get_markup_template('fake_feed.tpl');
$base = substr($data, strpos($data, '<entry'));
$feedxml = $tpl . $base . '</feed>';
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);
$feed->init();
logger('mod-salmon: Feed parsed.');
if ($feed->get_item_quantity()) {
foreach ($feed->get_items() as $item) {
$author = $item->get_author();
$author_link = unxmlify($author->get_link());
break;
}
}
if (!$author_link) {
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.
*
*/
$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s' ) \n\t\tAND `uid` = %d LIMIT 1", dbesc(NETWORK_OSTATUS), dbesc($author_link), dbesc($author_link), intval($importer['uid']));
if (!count($r)) {
logger('mod-salmon: Author unknown to us.');
if (get_pconfig($importer['uid'], 'system', 'ostatus_autofriend')) {
require_once 'include/follow.php';
$result = new_contact($importer['uid'], $author_link);
if ($result['success']) {
$r = q("SELECT * FROM `contact` WHERE `network` = '%s' AND ( `url` = '%s' OR `alias` = '%s' ) \n\t\t\t\t\tAND `uid` = %d LIMIT 1", dbesc(NETWORK_OSTATUS), dbesc($author_link), dbesc($author_link), intval($importer['uid']));
}
}
}
// 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);
}
