<?php /** @file */
/**
* Zot endpoint
*/
require_once('include/zot.php');
function post_init(&$a) {
// Most access to this endpoint is via the post method.
// Here we will pick out the magic auth params which arrive
// as a get request, and the only communications to arrive this way.
if(argc() > 1) {
$webbie = argv(1);
if(array_key_exists('auth',$_REQUEST)) {
logger('mod_zot: auth request received.');
$address = $_REQUEST['auth'];
$dest = $_REQUEST['dest'];
$sec = $_REQUEST['sec'];
$version = $_REQUEST['version'];
switch($dest) {
case 'channel':
$desturl = z_root() . '/channel/' . $webbie;
break;
case 'photos':
$desturl = z_root() . '/photos/' . $webbie;
break;
case 'profile':
$desturl = z_root() . '/profile/' . $webbie;
break;
default:
$desturl = $dest;
break;
}
$c = q("select * from channel where channel_address = '%s' limit 1",
dbesc($webbie)
);
if(! $c) {
logger('mod_zot: auth: unable to find channel ' . $webbie);
// They'll get a notice when they hit the page, we don't need two of them.
goaway($desturl);
}
// Try and find a hubloc for the person attempting to auth
$x = q("select * from hubloc left join xchan on xchan_hash = hubloc_hash where hubloc_addr = '%s' limit 1",
dbesc($address)
);
if(! $x) {
// finger them if they can't be found.
$ret = zot_finger($addr,null);
if($ret['success']) {
$j = json_decode($ret['body'],true);
if($j)
import_xchan($j);
$x = q("select * from hubloc left join xchan on xchan_hash = hubloc_hash where hubloc_addr = '%s' limit 1",
dbesc($address)
);
}
}
if(! $x) {
logger('mod_zot: auth: unable to finger ' . $addr);
goaway($desturl);
}
logger('mod_zot: auth request received from ' . $x[0]['xchan_addr'] . ' for ' . $webbie);
// check credentials and access
// If they are already authenticated and haven't changed credentials,
// we can save an expensive network round trip and improve performance.
$remote = remote_user();
$result = null;
$already_authed = ((($remote) && ($x[0]['hubloc_hash'] == $remote)) ? true : false);
if(! $already_authed) {
// Auth packets MUST use ultra top-secret hush-hush mode
$p = zot_build_packet($c[0],$type = 'auth_check',
array(array('guid' => $x[0]['hubloc_guid'],'guid_sig' => $x[0]['hubloc_guid_sig'])),
$x[0]['hubloc_sitekey'], $sec);
$result = zot_zot($x[0]['hubloc_callback'],$p);
if(! $result['success']) {
logger('mod_zot: auth_check callback failed.');
goaway($desturl);
}
$j = json_decode($result['body'],true);
}
if($already_authed || $j['success']) {
if($j['success']) {
// legit response, but we do need to check that this wasn't answered by a man-in-middle
if(! rsa_verify($sec . $x[0]['xchan_hash'],base64url_decode($j['confirm']),$x[0]['xchan_pubkey'])) {
logger('mod_zot: auth: final confirmation failed.');
goaway($desturl);
}
}
// everything is good... maybe
if(local_user()) {
// tell them to logout if they're logged in locally as anything but the target remote account
// in which case just shut up because they don't need to be doing this at all.
if($a->channel['channel_hash'] != $x[0]['xchan_hash']) {
logger('mod_zot: auth: already authenticated locally as somebody else.');
notice( t('Remote authentication blocked. You are logged into this site locally. Please logout and retry.') . EOL);
}
goaway($desturl);
}
// log them in
$_SESSION['authenticated'] = 1;
$_SESSION['visitor_id'] = $x[0]['xchan_hash'];
$_SESSION['my_address'] = $address;
$arr = array('xchan' => $x[0], 'url' => $desturl, 'channel_address' => $webbie);
call_hooks('magic_auth_success',$arr);
$a->set_observer($x[0]);
require_once('include/security.php');
$a->set_groups(init_groups_visitor($_SESSION['visitor_id']));
info(sprintf( t('Welcome %s. Remote authentication successful.'),$x[0]['xchan_name']));
logger('mod_zot: auth success from ' . $x[0]['xchan_addr'] . ' for ' . $webbie);
}
// FIXME - we really want to save the return_url in the session before we visit rmagic.
// This does however prevent a recursion if you visit rmagic directly, as it would otherwise send you back here again.
// But z_root() probably isn't where you really want to go.
if(strstr($desturl,z_root() . '/rmagic'))
goaway(z_root());
goaway($desturl);
}
logger('mod_zot: invalid args: ' . print_r($a->argv,true));
killme();
}
return;
}
function post_post(&$a) {
logger('mod_zot: ' . print_r($_REQUEST,true), LOGGER_DEBUG);
$ret = array('success' => false);
$data = json_decode($_REQUEST['data'],true);
logger('mod_zot: data: ' . print_r($data,true), LOGGER_DATA);
/**
* Many message packets will arrive encrypted. The existence of an 'iv' element
* tells us we need to unencapsulate the AES-256-CBC content using the site private key
*/
if(array_key_exists('iv',$data)) {
$data = aes_unencapsulate($data,get_config('system','prvkey'));
logger('mod_zot: decrypt1: ' . $data, LOGGER_DATA);
$data = json_decode($data,true);
}
logger('mod_zot: decoded data: ' . print_r($data,true), LOGGER_DATA);
$msgtype = ((array_key_exists('type',$data)) ? $data['type'] : '');
if($msgtype === 'pickup') {
/**
* The 'pickup' message arrives with a tracking ID which is associated with a particular outq_hash
* First verify that that the returned signatures verify, then check that we have an outbound queue item
* with the correct hash.
* If everything verifies, find any/all outbound messages in the queue for this hubloc and send them back
*
*/
if((! $data['secret']) || (! $data['secret_sig'])) {
$ret['message'] = 'no verification signature';
logger('mod_zot: pickup: ' . $ret['message'], LOGGER_DEBUG);
json_return_and_die($ret);
}
$r = q("select hubloc_sitekey from hubloc where hubloc_url = '%s' and hubloc_callback = '%s' and hubloc_sitekey != '' limit 1",
dbesc($data['url']),
dbesc($data['callback'])
);
if(! $r) {
$ret['message'] = 'site not found';
logger('mod_zot: pickup: ' . $ret['message']);
json_return_and_die($ret);
}
foreach ($r as $hubsite) {
// verify the url_sig
// If the server was re-installed at some point, there could be multiple hubs with the same url and callback.
// Only one will have a valid key.
$forgery = true;
$secret_fail = true;
$sitekey = $hubsite['hubloc_sitekey'];
// logger('sitekey: ' . $sitekey);
if(rsa_verify($data['callback'],base64url_decode($data['callback_sig']),$sitekey)) {
$forgery = false;
}
if(rsa_verify($data['secret'],base64url_decode($data['secret_sig']),$sitekey)) {
$secret_fail = false;
}
if((! $forgery) && (! $secret_fail))
break;
}
if($forgery) {
$ret['message'] = 'possible site forgery';
logger('mod_zot: pickup: ' . $ret['message']);
json_return_and_die($ret);
}
if($secret_fail) {
$ret['message'] = 'secret validation failed';
logger('mod_zot: pickup: ' . $ret['message']);
json_return_and_die($ret);
}
/**
* If we made it to here, the signatures verify, but we still don't know if the tracking ID is valid.
* It wouldn't be an error if the tracking ID isn't found, because we may have sent this particular
* queue item with another pickup (after the tracking ID for the other pickup was verified).
*/
$r = q("select outq_posturl from outq where outq_hash = '%s' and outq_posturl = '%s' limit 1",
dbesc($data['secret']),
dbesc($data['callback'])
);
if(! $r) {
$ret['message'] = 'nothing to pick up';
logger('mod_zot: pickup: ' . $ret['message']);
json_return_and_die($ret);
}
/**
* Everything is good if we made it here, so find all messages that are going to this location
* and send them all.
*/
$r = q("select * from outq where outq_posturl = '%s'",
dbesc($data['callback'])
);
if($r) {
$ret['success'] = true;
$ret['pickup'] = array();
foreach($r as $rr) {
$ret['pickup'][] = array('notify' => json_decode($rr['outq_notify'],true),'message' => json_decode($rr['outq_msg'],true));
$x = q("delete from outq where outq_hash = '%s' limit 1",
dbesc($rr['outq_hash'])
);
}
}
$encrypted = aes_encapsulate(json_encode($ret),$sitekey);
json_return_and_die($encrypted);
/** pickup: end */
}
/**
* All other message types require us to verify the sender. This is a generic check, so we
* will do it once here and bail if anything goes wrong.
*/
if(array_key_exists('sender',$data)) {
$sender = $data['sender'];
}
/** Check if the sender is already verified here */
$hub = zot_gethub($sender);
if(! $hub) {
/** Have never seen this guid or this guid coming from this location. Check it and register it. */
// (!!) this will validate the sender
$result = zot_register_hub($sender);
if((! $result['success']) || (! zot_gethub($sender))) {
$ret['message'] = 'Hub not available.';
logger('mod_zot: no hub');
json_return_and_die($ret);
}
}
// TODO: check which hub is primary and take action if mismatched
if(array_key_exists('recipients',$data))
$recipients = $data['recipients'];
if($msgtype === 'purge') {
if($recipients) {
// basically this means "unfriend"
foreach($recipients as $recip) {
}
}
else {
// Unfriend everybody - basically this means the channel has committed suicide
$arr = $data['sender'];
$sender_hash = base64url_encode(hash('whirlpool',$arr['guid'] . $arr['guid_sig'], true));
require_once('include/Contact.php');
remove_all_xchan_resources($sender_hash);
$ret['success'] = true;
json_return_and_die($ret);
}
}
if($msgtype === 'refresh') {
// remote channel info (such as permissions or photo or something)
// has been updated. Grab a fresh copy and sync it.
if($recipients) {
// This would be a permissions update, typically for one connection
foreach($recipients as $recip) {
$r = q("select channel.*,xchan.* from channel
left join xchan on channel_hash = xchan_hash
where channel_guid = '%s' and channel_guid_sig = '%s' limit 1",
dbesc($recip['guid']),
dbesc($recip['guid_sig'])
);
$x = zot_refresh(array(
'xchan_guid' => $sender['guid'],
'xchan_guid_sig' => $sender['guid_sig'],
'hubloc_url' => $sender['url']
),$r[0]);
}
}
else {
// system wide refresh
$x = zot_refresh(array(
'xchan_guid' => $sender['guid'],
'xchan_guid_sig' => $sender['guid_sig'],
'hubloc_url' => $sender['url']
),null);
}
$ret['success'] = true;
json_return_and_die($ret);
}
if($msgtype === 'notify') {
$async = get_config('system','queued_fetch');
if($async) {
// add to receive queue
// qreceive_add($data);
}
else {
$x = zot_fetch($data);
$ret['delivery_report'] = $x;
}
$ret['success'] = true;
json_return_and_die($ret);
}
if($msgtype === 'auth_check') {
logger('mod_zot: auth_check');
$arr = $data['sender'];
$sender_hash = base64url_encode(hash('whirlpool',$arr['guid'] . $arr['guid_sig'], true));
// garbage collect any old unused notifications
q("delete from verify where type = 'auth' and created < UTC_TIMESTAMP() - INTERVAL 10 MINUTE");
$y = q("select xchan_pubkey from xchan where xchan_hash = '%s' limit 1",
dbesc($sender_hash)
);
// We created a unique hash in mod/magic.php when we invoked remote auth, and stored it in
// the verify table. It is now coming back to us as 'secret' and is signed by the other site.
// First verify their signature.
if((! $y) || (! rsa_verify($data['secret'],base64url_decode($data['secret_sig']),$y[0]['xchan_pubkey']))) {
logger('mod_zot: auth_check: sender not found or secret_sig invalid.');
json_return_and_die($ret);
}
// There should be exactly one recipient
if($data['recipients']) {
$arr = $data['recipients'][0];
$recip_hash = base64url_encode(hash('whirlpool',$arr['guid'] . $arr['guid_sig'], true));
$c = q("select channel_id, channel_prvkey from channel where channel_hash = '%s' limit 1",
dbesc($recip_hash)
);
if(! $c) {
logger('mod_zot: auth_check: recipient channel not found.');
json_return_and_die($ret);
}
$confirm = base64url_encode(rsa_sign($data['secret'] . $recip_hash,$c[0]['channel_prvkey']));
// This additionally checks for forged senders since we already stored the expected result in meta
// and we've already verified that this is them via zot_gethub() and that their key signed our token
$z = q("select id from verify where channel = %d and type = 'auth' and token = '%s' and meta = '%s' limit 1",
intval($c[0]['channel_id']),
dbesc($data['secret']),
dbesc($sender_hash)
);
if(! $z) {
logger('mod_zot: auth_check: verification key not found.');
json_return_and_die($ret);
}
$r = q("delete from verify where id = %d limit 1",
intval($z[0]['id'])
);
logger('mod_zot: auth_check: success', LOGGER_DEBUG);
$ret['success'] = true;
$ret['confirm'] = $confirm;
json_return_and_die($ret);
}
json_return_and_die($ret);
}
// catchall
json_return_and_die($ret);
}
