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