the urlencoded webbie (channel@host.domain) of the channel requesting access * * dest => the desired destination URL (urlencoded) * * sec => a random string which is also stored on $mysite for use during the verification phase. * * version => the zot revision * * delegate => optional urlencoded webbie of a local channel to invoke delegation rights for * * When this packet is received, an "auth-check" zot message is sent to $mysite. * (e.g. if $_GET['auth'] is foobar@podunk.edu, a zot packet is sent to the podunk.edu zot endpoint, which is typically /post) * If no information has been recorded about the requesting identity a zot information packet will be retrieved before * continuing. * * The sender of this packet is an arbitrary/random site channel. The recipients will be a single recipient corresponding * to the guid and guid_sig we have associated with the requesting auth identity * * \code{.json} * { * "type":"auth_check", * "sender":{ * "guid":"kgVFf_...", * "guid_sig":"PT9-TApz...", * "url":"http:\/\/podunk.edu", * "url_sig":"T8Bp7j..." * }, * "recipients":{ * { * "guid":"ZHSqb...", * "guid_sig":"JsAAXi..." * } * } * "callback":"\/post", * "version":1, * "secret":"1eaa661", * "secret_sig":"eKV968b1..." * } * \endcode * * auth_check messages MUST use encapsulated encryption. This message is sent to the origination site, which checks the 'secret' to see * if it is the same as the 'sec' which it passed originally. It also checks the secret_sig which is the secret signed by the * destination channel's private key and base64url encoded. If everything checks out, a json packet is returned: * * \code{.json} * { * "success":1, * "confirm":"q0Ysovd1u...", * "service_class":(optional) * "level":(optional) * } * \endcode * * 'confirm' in this case is the base64url encoded RSA signature of the concatenation of 'secret' with the * base64url encoded whirlpool hash of the requestor's guid and guid_sig; signed with the source channel private key. * This prevents a man-in-the-middle from inserting a rogue success packet. Upon receipt and successful * verification of this packet, the destination site will redirect to the original destination URL and indicate a successful remote login. * Service_class can be used by cooperating sites to provide different access rights based on account rights and subscription plans. It is * a string whose contents are not defined by protocol. Example: "basic" or "gold". * * @param[in,out] App &$a */ function post_init(&$a) { if (array_key_exists('auth', $_REQUEST)) { $ret = array('success' => false, 'message' => ''); logger('mod_zot: auth request received.'); $address = $_REQUEST['auth']; $desturl = $_REQUEST['dest']; $sec = $_REQUEST['sec']; $version = $_REQUEST['version']; $delegate = $_REQUEST['delegate']; $test = ((x($_REQUEST, 'test')) ? intval($_REQUEST['test']) : 0); // They are authenticating ultimately to the site and not to a particular channel. // Any channel will do, providing it's currently active. We just need to have an // identity to attach to the packet we send back. So find one. $c = q("select * from channel where channel_removed = 0 limit 1"); if (! $c) { // nobody here logger('mod_zot: auth: unable to find a response channel'); if ($test) { $ret['message'] .= 'no local channels found.' . EOL; json_return_and_die($ret); } goaway($desturl); } // Try and find a hubloc for the person attempting to auth $x = q("select * from hubloc left join xchan on xchan_hash = hubloc_hash where hubloc_addr = '%s' order by hubloc_id desc", dbesc($address) ); if (! $x) { // finger them if they can't be found. $ret = zot_finger($address, null); if ($ret['success']) { $j = json_decode($ret['body'], true); if ($j) import_xchan($j); $x = q("select * from hubloc left join xchan on xchan_hash = hubloc_hash where hubloc_addr = '%s' order by hubloc_id desc", dbesc($address) ); } } if(! $x) { logger('mod_zot: auth: unable to finger ' . $address); if($test) { $ret['message'] .= 'no hubloc found for ' . $address . ' and probing failed.' . EOL; json_return_and_die($ret); } goaway($desturl); } foreach($x as $xx) { logger('mod_zot: auth request received from ' . $xx['hubloc_addr'] ); // 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_channel(); $result = null; $remote_service_class = ''; $remote_level = 0; $remote_hub = $xx['hubloc_url']; $DNT = 0; // Also check that they are coming from the same site as they authenticated with originally. $already_authed = ((($remote) && ($xx['hubloc_hash'] == $remote) && ($xx['hubloc_url'] === $_SESSION['remote_hub'])) ? true : false); if($delegate && $delegate !== $_SESSION['delegate_channel']) $already_authed = false; $j = array(); if (! $already_authed) { // Auth packets MUST use ultra top-secret hush-hush mode - e.g. the entire packet is encrypted using the site private key // The actual channel sending the packet ($c[0]) is not important, but this provides a generic zot packet with a sender // which can be verified $p = zot_build_packet($c[0],$type = 'auth_check', array(array('guid' => $xx['hubloc_guid'],'guid_sig' => $xx['hubloc_guid_sig'])), $xx['hubloc_sitekey'], $sec); if ($test) { $ret['message'] .= 'auth check packet created using sitekey ' . $xx['hubloc_sitekey'] . EOL; $ret['message'] .= 'packet contents: ' . $p . EOL; } $result = zot_zot($xx['hubloc_callback'],$p); if (! $result['success']) { logger('mod_zot: auth_check callback failed.'); if ($test) { $ret['message'] .= 'auth check request to your site returned .' . print_r($result, true) . EOL; continue; } continue; } $j = json_decode($result['body'], true); if (! $j) { logger('mod_zot: auth_check json data malformed.'); if($test) { $ret['message'] .= 'json malformed: ' . $result['body'] . EOL; continue; } } } if ($test) { $ret['message'] .= 'auth check request returned .' . print_r($j, true) . EOL; } 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 . $xx['xchan_hash'],base64url_decode($j['confirm']),$xx['xchan_pubkey'])) { logger('mod_zot: auth: final confirmation failed.'); if ($test) { $ret['message'] .= 'final confirmation failed. ' . $sec . print_r($j,true) . print_r($xx,true); continue; } continue; } if (array_key_exists('service_class',$j)) $remote_service_class = $j['service_class']; if (array_key_exists('level',$j)) $remote_level = $j['level']; if (array_key_exists('DNT',$j)) $DNT = $j['DNT']; } // everything is good... maybe if(local_channel()) { // tell them to logout if they're logged in locally as anything but the target remote account // in which case just shut up because they don't need to be doing this at all. if ($a->channel['channel_hash'] != $xx['xchan_hash']) { logger('mod_zot: auth: already authenticated locally as somebody else.'); notice( t('Remote authentication blocked. You are logged into this site locally. Please logout and retry.') . EOL); if ($test) { $ret['message'] .= 'already logged in locally with a conflicting identity.' . EOL; continue; } } continue; } // log them in if ($test) { $ret['success'] = true; $ret['message'] .= 'Authentication Success!' . EOL; json_return_and_die($ret); } $delegation_success = false; if ($delegate) { $r = q("select * from channel left join xchan on channel_hash = xchan_hash where xchan_addr = '%s' limit 1", dbesc($delegate) ); if ($r && intval($r[0]['channel_id'])) { $allowed = perm_is_allowed($r[0]['channel_id'],$xx['xchan_hash'],'delegate'); if ($allowed) { $_SESSION['delegate_channel'] = $r[0]['channel_id']; $_SESSION['delegate'] = $xx['xchan_hash']; $_SESSION['account_id'] = intval($r[0]['channel_account_id']); require_once('include/security.php'); change_channel($r[0]['channel_id']); $delegation_success = true; } } } $_SESSION['authenticated'] = 1; if (! $delegation_success) { $_SESSION['visitor_id'] = $xx['xchan_hash']; $_SESSION['my_url'] = $xx['xchan_url']; $_SESSION['my_address'] = $address; $_SESSION['remote_service_class'] = $remote_service_class; $_SESSION['remote_level'] = $remote_level; $_SESSION['remote_hub'] = $remote_hub; $_SESSION['DNT'] = $DNT; } $arr = array('xchan' => $xx, 'url' => $desturl, 'session' => $_SESSION); call_hooks('magic_auth_success',$arr); $a->set_observer($xx); require_once('include/security.php'); $a->set_groups(init_groups_visitor($_SESSION['visitor_id'])); info(sprintf( t('Welcome %s. Remote authentication successful.'),$xx['xchan_name'])); logger('mod_zot: auth success from ' . $xx['xchan_addr']); } else { if ($test) { $ret['message'] .= 'auth failure. ' . print_r($_REQUEST,true) . print_r($j,true) . EOL; continue; } logger('mod_zot: magic-auth failure - not authenticated: ' . $xx['xchan_addr']); } if ($test) { $ret['message'] .= 'auth failure fallthrough ' . print_r($_REQUEST,true) . print_r($j,true) . EOL; continue; } } /** * @FIXME we really want to save the return_url in the session before we * visit rmagic. This does however prevent a recursion if you visit * rmagic directly, as it would otherwise send you back here again. * But z_root() probably isn't where you really want to go. */ if(strstr($desturl,z_root() . '/rmagic')) goaway(z_root()); if ($test) { json_return_and_die($ret); } goaway($desturl); } } /** * @brief zot communications and messaging. * * Sender HTTP posts to this endpoint ($site/post typically) with 'data' parameter set to json zot message packet. * This packet is optionally encrypted, which we will discover if the json has an 'iv' element. * $contents => array( 'alg' => 'aes256cbc', 'iv' => initialisation vector, 'key' => decryption key, 'data' => encrypted data); * $contents->iv and $contents->key are random strings encrypted with this site's RSA public key and then base64url encoded. * Currently only 'aes256cbc' is used, but this is extensible should that algorithm prove inadequate. * * Once decrypted, one will find the normal json_encoded zot message packet. * * Defined packet types are: notify, purge, refresh, force_refresh, auth_check, ping, and pickup * * Standard packet: (used by notify, purge, refresh, force_refresh, and auth_check) * \code{.json} * { * "type": "notify", * "sender":{ * "guid":"kgVFf_1...", * "guid_sig":"PT9-TApzp...", * "url":"http:\/\/podunk.edu", * "url_sig":"T8Bp7j5...", * }, * "recipients": { optional recipient array }, * "callback":"\/post", * "version":1, * "secret":"1eaa...", * "secret_sig": "df89025470fac8..." * } * \endcode * * Signature fields are all signed with the sender channel private key and base64url encoded. * Recipients are arrays of guid and guid_sig, which were previously signed with the recipients private * key and base64url encoded and later obtained via channel discovery. Absence of recipients indicates * a public message or visible to all potential listeners on this site. * * "pickup" packet: * The pickup packet is sent in response to a notify packet from another site * \code{.json} * { * "type":"pickup", * "url":"http:\/\/example.com", * "callback":"http:\/\/example.com\/post", * "callback_sig":"teE1_fLI...", * "secret":"1eaa...", * "secret_sig":"O7nB4_..." * } * \endcode * * In the pickup packet, the sig fields correspond to the respective data * element signed with this site's system private key and then base64url encoded. * The "secret" is the same as the original secret from the notify packet. * * If verification is successful, a json structure is returned containing a * success indicator and an array of type 'pickup'. * Each pickup element contains the original notify request and a message field * whose contents are dependent on the message type. * * This JSON array is AES encapsulated using the site public key of the site * that sent the initial zot pickup packet. * Using the above example, this would be example.com. * * \code{.json} * { * "success":1, * "pickup":{ * "notify":{ * "type":"notify", * "sender":{ * "guid":"kgVFf_...", * "guid_sig":"PT9-TApz...", * "url":"http:\/\/z.podunk.edu", * "url_sig":"T8Bp7j5D..." * }, * "callback":"\/post", * "version":1, * "secret":"1eaa661..." * }, * "message":{ * "type":"activity", * "message_id":"10b049ce384cbb2da9467319bc98169ab36290b8bbb403aa0c0accd9cb072e76@podunk.edu", * "message_top":"10b049ce384cbb2da9467319bc98169ab36290b8bbb403aa0c0accd9cb072e76@podunk.edu", * "message_parent":"10b049ce384cbb2da9467319bc98169ab36290b8bbb403aa0c0accd9cb072e76@podunk.edu", * "created":"2012-11-20 04:04:16", * "edited":"2012-11-20 04:04:16", * "title":"", * "body":"Hi Nickordo", * "app":"", * "verb":"post", * "object_type":"", * "target_type":"", * "permalink":"", * "location":"", * "longlat":"", * "owner":{ * "name":"Indigo", * "address":"indigo@podunk.edu", * "url":"http:\/\/podunk.edu", * "photo":{ * "mimetype":"image\/jpeg", * "src":"http:\/\/podunk.edu\/photo\/profile\/m\/5" * }, * "guid":"kgVFf_...", * "guid_sig":"PT9-TAp...", * }, * "author":{ * "name":"Indigo", * "address":"indigo@podunk.edu", * "url":"http:\/\/podunk.edu", * "photo":{ * "mimetype":"image\/jpeg", * "src":"http:\/\/podunk.edu\/photo\/profile\/m\/5" * }, * "guid":"kgVFf_...", * "guid_sig":"PT9-TAp..." * } * } * } * } * \endcode * * Currently defined message types are 'activity', 'mail', 'profile', 'location' * and 'channel_sync', which each have different content schemas. * * Ping packet: * A ping packet does not require any parameters except the type. It may or may * not be encrypted. * * \code{.json} * { * "type": "ping" * } * \endcode * * On receipt of a ping packet a ping response will be returned: * * \code{.json} * { * "success" : 1, * "site" { * "url": "http:\/\/podunk.edu", * "url_sig": "T8Bp7j5...", * "sitekey": "-----BEGIN PUBLIC KEY----- * MIICIjANBgkqhkiG9w0BAQE..." * } * } * \endcode * * The ping packet can be used to verify that a site has not been re-installed, and to * initiate corrective action if it has. The url_sig is signed with the site private key * and base64url encoded - and this should verify with the enclosed sitekey. Failure to * verify indicates the site is corrupt or otherwise unable to communicate using zot. * This return packet is not otherwise verified, so should be compared with other * results obtained from this site which were verified prior to taking action. For instance * if you have one verified result with this signature and key, and other records for this * url which have different signatures and keys, it indicates that the site was re-installed * and corrective action may commence (remove or mark invalid any entries with different * signatures). * If you have no records which match this url_sig and key - no corrective action should * be taken as this packet may have been returned by an imposter. * * @param[in,out] App &$a */ function post_post(&$a) { require_once('Zotlabs/Zot/Receiver.php'); $z = new Zotlabs\Zot\Receiver($_REQUEST['data'],get_config('system','prvkey')); // notreached; exit; }