diff options
Diffstat (limited to 'mod')
| -rw-r--r-- | mod/post.php | 477 |
1 files changed, 3 insertions, 474 deletions
diff --git a/mod/post.php b/mod/post.php index 1842d78ca..6885b0d69 100644 --- a/mod/post.php +++ b/mod/post.php @@ -481,6 +481,8 @@ function post_init(&$a) { * * @param[in,out] App &$a */ + + function post_post(&$a) { require_once('Zotlabs/Zot/Receiver.php'); @@ -489,479 +491,6 @@ function post_post(&$a) { // notreached; -exit; - - $encrypted_packet = false; - $ret = array('success' => false); - - $data = json_decode($_REQUEST['data'],true); - - /* - * 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($data && array_key_exists('iv',$data)) { - $encrypted_packet = true; - $data = crypto_unencapsulate($data,get_config('system','prvkey')); - logger('mod_zot: decrypt1: ' . $data, LOGGER_DATA); - $data = json_decode($data,true); - } - - if(! $data) { - - // possible Bleichenbacher's attack, just treat it as a - // message we have no handler for. It should fail a bit - // further along with "no hub". Our public key is public - // knowledge. There's no reason why anybody should get the - // encryption wrong unless they're fishing or hacking. If - // they're developing and made a goof, this can be discovered - // in the logs of the destination site. If they're fishing or - // hacking, the bottom line is we can't verify their hub. - // That's all we're going to tell them. - - $data = array('type' => 'bogus'); - } - - - $msgtype = ((array_key_exists('type',$data)) ? $data['type'] : ''); - - if($msgtype === 'ping') { - - // Useful to get a health check on a remote site. - // This will let us know if any important communication details - // that we may have stored are no longer valid, regardless of xchan details. - logger('POST: got ping send pong now back: ' . z_root() , LOGGER_DEBUG ); - - $ret['success'] = true; - $ret['site'] = array(); - $ret['site']['url'] = z_root(); - $ret['site']['url_sig'] = base64url_encode(rsa_sign(z_root(),get_config('system','prvkey'))); - $ret['site']['sitekey'] = get_config('system','pubkey'); - json_return_and_die($ret); - } - - - 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); - } - $r = q("select distinct hubloc_sitekey from hubloc where hubloc_url = '%s' and hubloc_callback = '%s' and hubloc_sitekey != '' group by hubloc_sitekey ", - dbesc($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('mod_zot: Checking sitekey: ' . $sitekey, LOGGER_DATA); - - if(rsa_verify($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) { - logger('mod_zot: successful pickup message received from ' . $data['callback'] . ' ' . count($r) . ' message(s) picked up', LOGGER_DEBUG); - - $ret['success'] = true; - $ret['pickup'] = array(); - foreach($r as $rr) { - if($rr['outq_msg']) { - $x = json_decode($rr['outq_msg'],true); - - if(! $x) - continue; - - if(array_key_exists('message_list',$x)) { - foreach($x['message_list'] as $xx) { - $ret['pickup'][] = array('notify' => json_decode($rr['outq_notify'],true),'message' => $xx); - } - } - else - $ret['pickup'][] = array('notify' => json_decode($rr['outq_notify'],true),'message' => $x); - - $x = q("delete from outq where outq_hash = '%s'", - dbesc($rr['outq_hash']) - ); - } - } - } - - $encrypted = crypto_encapsulate(json_encode($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 */ - - $hubs = zot_gethub($sender,true); - - if (! $hubs) { - - /* 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 ((! $result['success']) || (! ($hubs = zot_gethub($sender,true)))) { - $ret['message'] = 'Hub not available.'; - logger('mod_zot: no hub'); - json_return_and_die($ret); - } - } - - - foreach($hubs as $hub) { - - $sitekey = $hub['hubloc_sitekey']; - - if(array_key_exists('sitekey',$sender) && $sender['sitekey']) { - - /* - * This hub has now been proven to be valid. - * Any hub with the same URL and a different sitekey cannot be valid. - * Get rid of them (mark them deleted). There's a good chance they were re-installs. - */ - - q("update hubloc set hubloc_deleted = 1, hubloc_error = 1 where hubloc_url = '%s' and hubloc_sitekey != '%s' ", - dbesc($hub['hubloc_url']), - dbesc($sender['sitekey']) - ); - - $sitekey = $sender['sitekey']; - } - - // $sender['sitekey'] is a new addition to the protcol to distinguish - // hublocs coming from re-installed sites. Older sites will not provide - // this field and we have to still mark them valid, since we can't tell - // if this hubloc has the same sitekey as the packet we received. - - - // Update our DB to show when we last communicated successfully with this hub - // This will allow us to prune dead hubs from using up resources - - $r = q("update hubloc set hubloc_connected = '%s' where hubloc_id = %d and hubloc_sitekey = '%s' ", - dbesc(datetime_convert()), - intval($hub['hubloc_id']), - dbesc($sitekey) - ); - - // a dead hub came back to life - reset any tombstones we might have - - if(intval($hub['hubloc_error'])) { - q("update hubloc set hubloc_error = 0 where hubloc_id = %d and hubloc_sitekey = '%s' ", - intval($hub['hubloc_id']), - dbesc($sitekey) - ); - if(intval($r[0]['hubloc_orphancheck'])) { - q("update hubloc set hubloc_orhpancheck = 0 where hubloc_id = %d and hubloc_sitekey = '%s' ", - intval($hub['hubloc_id']), - dbesc($sitekey) - ); - } - q("update xchan set xchan_orphan = 0 where xchan_orphan = 1 and xchan_hash = '%s'", - dbesc($hub['hubloc_hash']) - ); - } - - $connecting_url = $hub['hubloc_url']; - } - - - /** @TODO check which hub is primary and take action if mismatched */ - - if (array_key_exists('recipients', $data)) - $recipients = $data['recipients']; - - - if ($msgtype === 'auth_check') { - - /* - * Requestor visits /magic/?dest=somewhere on their own site with a browser - * magic redirects them to $destsite/post [with auth args....] - * $destsite sends an auth_check packet to originator site - * The auth_check packet is handled here by the originator's site - * - the browser session is still waiting - * inside $destsite/post for everything to verify - * If everything checks out we'll return a token to $destsite - * and then $destsite will verify the token, authenticate the browser - * session and then redirect to the original destination. - * If authentication fails, the redirection to the original destination - * will still take place but without authentication. - */ - logger('mod_zot: auth_check', LOGGER_DEBUG); - - if (! $encrypted_packet) { - logger('mod_zot: auth_check packet was not encrypted.'); - $ret['message'] .= 'no packet encryption' . EOL; - json_return_and_die($ret); - } - - $arr = $data['sender']; - $sender_hash = make_xchan_hash($arr['guid'],$arr['guid_sig']); - - // garbage collect any old unused notifications - - // This was and should be 10 minutes but my hosting provider has time lag between the DB and - // the web server. We should probably convert this to webserver time rather than DB time so - // that the different clocks won't affect it and allow us to keep the time short. - - q("delete from verify where type = 'auth' and created < %s - INTERVAL %s", - db_utcnow(), db_quoteinterval('30 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 a channel at the other end. - // First verify their signature. We will have obtained a zot-info packet from them as part of the sender - // verification. - - 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.'); - $ret['message'] .= 'sender not found or sig invalid ' . print_r($y,true) . EOL; - json_return_and_die($ret); - } - - // There should be exactly one recipient, the original auth requestor - - $ret['message'] .= 'recipients ' . print_r($recipients,true) . EOL; - - if ($data['recipients']) { - - $arr = $data['recipients'][0]; - $recip_hash = make_xchan_hash($arr['guid'], $arr['guid_sig']); - $c = q("select channel_id, channel_account_id, channel_prvkey from channel where channel_hash = '%s' limit 1", - dbesc($recip_hash) - ); - if (! $c) { - logger('mod_zot: auth_check: recipient channel not found.'); - $ret['message'] .= 'recipient not found.' . EOL; - json_return_and_die($ret); - } - - $confirm = base64url_encode(rsa_sign($data['secret'] . $recip_hash,$c[0]['channel_prvkey'])); - - // This additionally checks for forged sites 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($data['secret']), - dbesc($data['sender']['url']) - ); - if (! $z) { - logger('mod_zot: auth_check: verification key not found.'); - $ret['message'] .= 'verification key not found' . EOL; - json_return_and_die($ret); - } - $r = q("delete from verify where id = %d", - intval($z[0]['id']) - ); - - $u = q("select account_service_class from account where account_id = %d limit 1", - intval($c[0]['channel_account_id']) - ); - - logger('mod_zot: auth_check: success', LOGGER_DEBUG); - $ret['success'] = true; - $ret['confirm'] = $confirm; - if ($u && $u[0]['account_service_class']) - $ret['service_class'] = $u[0]['account_service_class']; - - // Set "do not track" flag if this site or this channel's profile is restricted - // in some way - - if (intval(get_config('system','block_public'))) - $ret['DNT'] = true; - if (! perm_is_allowed($c[0]['channel_id'],'','view_profile')) - $ret['DNT'] = true; - if (get_pconfig($c[0]['channel_id'],'system','do_not_track')) - $ret['DNT'] = true; - if (get_pconfig($c[0]['channel_id'],'system','hide_online_status')) - $ret['DNT'] = true; - - json_return_and_die($ret); - } - json_return_and_die($ret); - } - - if ($msgtype === 'request') { - // request a particular post/conversation by message_id - $x = zot_process_message_request($data); - json_return_and_die($x); - } - - if ($msgtype === 'purge') { - if ($recipients) { - // basically this means "unfriend" - foreach ($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($recip['guid_sig']) - ); - if ($r) { - $r = q("select abook_id from abook where uid = %d and abook_xchan = '%s' limit 1", - intval($r[0]['channel_id']), - dbesc(make_xchan_hash($sender['guid'],$sender['guid_sig'])) - ); - if ($r) { - contact_remove($r[0]['channel_id'],$r[0]['abook_id']); - } - } - } - } else { - // Unfriend everybody - basically this means the channel has committed suicide - $arr = $data['sender']; - $sender_hash = make_xchan_hash($arr['guid'],$arr['guid_sig']); - - require_once('include/Contact.php'); - remove_all_xchan_resources($sender_hash); - - $ret['success'] = true; - json_return_and_die($ret); - } - } - - if (($msgtype === 'refresh') || ($msgtype === 'force_refresh')) { - - // remote channel info (such as permissions or photo or something) - // has been updated. Grab a fresh copy and sync it. - // The difference between refresh and force_refresh is that - // force_refresh unconditionally creates a directory update record, - // even if no changes were detected upon processing. - - 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'] - ), $r[0], (($msgtype === 'force_refresh') ? true : false)); - } - } else { - - // system wide refresh - - $x = zot_refresh(array( - 'xchan_guid' => $sender['guid'], - 'xchan_guid_sig' => $sender['guid_sig'], - 'hubloc_url' => $sender['url'] - ), null, (($msgtype === 'force_refresh') ? true : false)); - } - $ret['success'] = true; - json_return_and_die($ret); - } - - if ($msgtype === 'notify') { - - logger('notify received from ' . $connecting_url); - - - $async = get_config('system','queued_fetch'); - - if ($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); - } + exit; - // catchall - json_return_and_die($ret); } |