diff options
Diffstat (limited to 'Zotlabs/Zot/Auth.php')
| -rw-r--r-- | Zotlabs/Zot/Auth.php | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/Zotlabs/Zot/Auth.php b/Zotlabs/Zot/Auth.php new file mode 100644 index 000000000..950a7593a --- /dev/null +++ b/Zotlabs/Zot/Auth.php @@ -0,0 +1,356 @@ +<?php + +namespace Zotlabs\Zot; + +class Auth { + + protected $ret; + protected $test; + protected $address; + protected $desturl; + protected $sec; + protected $version; + protected $delegate; + protected $success; + protected $delegate_success; + + protected $remote; + protected $remote_service_class; + protected $remote_level; + protected $remote_hub; + protected $dnt; + + function __construct($req) { + + logger('construct'); + + $this->ret = array('success' => false); + $this->success = false; + $this->test = ((array_key_exists('test',$req)) ? intval($req['test']) : 0); + $this->address = $req['auth']; + $this->desturl = $req['dest']; + $this->sec = $req['sec']; + $this->version = $req['version']; + $this->delegate = $req['delegate']; + + $c = get_sys_channel(); + if(! $c) { + logger('unable to obtain response (sys) channel'); + reply_die('no local channels found.'); + } + + $x = $this->GetHublocs($this->address); + + logger('hublocs'); + + foreach($x as $xx) { + + logger('verify'); + + if($this->Verify($c,$xx)) + break; + } + + /** + * @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($this->desturl,z_root() . '/rmagic')) + goaway(z_root()); + + $this->reply_die(); + + } + + function GetHublocs($address) { + + // 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); + $this->reply_die('no hubloc found for ' . $address . ' and probing failed.'); + } + + return $x; + } + + + function Verify($channel,$hubloc) { + logger('auth request received from ' . $hubloc['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. + + $this->remote = remote_channel(); + $this->remote_service_class = ''; + $this->remote_level = 0; + $this->remote_hub = $hubloc['hubloc_url']; + $this->dnt = 0; + + // Also check that they are coming from the same site as they authenticated with originally. + + $already_authed = ((($this->remote) && ($hubloc['hubloc_hash'] == $this->remote) + && ($hubloc['hubloc_url'] === $_SESSION['remote_hub'])) ? true : false); + if($this->delegate && $this->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 + + $p = zot_build_packet($channel,$type = 'auth_check', + array(array('guid' => $hubloc['hubloc_guid'],'guid_sig' => $hubloc['hubloc_guid_sig'])), + $hubloc['hubloc_sitekey'], $this->sec); + + $this->dbg_msg('auth check packet created using sitekey ' . $hubloc['hubloc_sitekey']); + $this->dbg_msg('packet contents: ' . $p); + + + $result = zot_zot($hubloc['hubloc_callback'],$p); + + if(! $result['success']) { + logger('auth_check callback failed.'); + if($this->test) { + $this->dbg_msg('auth check request to your site returned .' . print_r($result, true)); + return false; + } + return false; + } + $j = json_decode($result['body'], true); + if(! $j) { + logger('auth_check json data malformed.'); + if($this->test) { + $this->dbg_msg('json malformed: ' . $result['body']); + return false; + } + } + + $this->dbg_msg('auth check request returned .' . print_r($j, 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($this->sec . $hubloc['xchan_hash'],base64url_decode($j['confirm']),$hubloc['xchan_pubkey'])) { + logger('final confirmation failed.'); + if($this->test) { + $this->dbg_msg('final confirmation failed. ' . $sec . print_r($j,true) . print_r($hubloc,true)); + return false; + } + return false; + } + if (array_key_exists('service_class',$j)) + $this->remote_service_class = $j['service_class']; + if (array_key_exists('level',$j)) + $this->remote_level = $j['level']; + if (array_key_exists('DNT',$j)) + $this->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 (get_app()->channel['channel_hash'] != $hubloc['xchan_hash']) { + logger('already authenticated locally as somebody else.'); + notice( t('Remote authentication blocked. You are logged into this site locally. Please logout and retry.') . EOL); + if($this->test) { + $$this->dbg_msg('already logged in locally with a conflicting identity.'); + return false;; + } + } + return false;; + } + + // log them in + + if ($this->test) { + $ret['success'] = true; + $this->reply_die('Authentication Success!'); + } + + $this->delegate_success = false; + if($this->delegate) { + $r = q("select * from channel left join xchan on channel_hash = xchan_hash where xchan_addr = '%s' limit 1", + dbesc($this->delegate) + ); + if ($r && intval($r[0]['channel_id'])) { + $allowed = perm_is_allowed($r[0]['channel_id'],$hubloc['xchan_hash'],'delegate'); + if($allowed) { + $_SESSION['delegate_channel'] = $r[0]['channel_id']; + $_SESSION['delegate'] = $hubloc['xchan_hash']; + $_SESSION['account_id'] = intval($r[0]['channel_account_id']); + require_once('include/security.php'); + change_channel($r[0]['channel_id']); + $this->delegate_success = true; + } + } + } + + $_SESSION['authenticated'] = 1; + if (! $this->delegate_success) { + $_SESSION['visitor_id'] = $hubloc['xchan_hash']; + $_SESSION['my_url'] = $hubloc['xchan_url']; + $_SESSION['my_address'] = $this->address; + $_SESSION['remote_service_class'] = $this->remote_service_class; + $_SESSION['remote_level'] = $this->remote_level; + $_SESSION['remote_hub'] = $this->remote_hub; + $_SESSION['DNT'] = $this->dnt; + } + + $arr = array('xchan' => $hubloc, 'url' => $this->desturl, 'session' => $_SESSION); + call_hooks('magic_auth_success',$arr); + get_app()->set_observer($hubloc); + require_once('include/security.php'); + get_app()->set_groups(init_groups_visitor($_SESSION['visitor_id'])); + info(sprintf( t('Welcome %s. Remote authentication successful.'),$hubloc['xchan_name'])); + logger('mod_zot: auth success from ' . $hubloc['xchan_addr']); + $this->success = true; + return true; + } + else { + if($this->test) { + $this->dbg_msg('auth failure. ' . print_r($_REQUEST,true) . print_r($j,true)); + return false; + } + logger('magic-auth failure - not authenticated: ' . $hubloc['xchan_addr']); + } + + if($this->test) { + $this->dbg_msg('auth failure fallthrough ' . print_r($_REQUEST,true) . print_r($j,true)); + return false; + } + } + } + + + function dbg_msg($msg) { + if($msg) { + if(array_key_exists('message',$this->ret)) + $this->ret['message'] .= $msg; + else + $this->ret['message'] = $msg; + } + } + + + function reply_die($msg,$goaway = true) { + if($msg) { + if(array_key_exists('message',$this->ret)) + $this->ret['message'] .= $msg; + else + $this->ret['message'] = $msg; + } + if($this->test) + json_return_and_die($this->ret); + if($goaway) + goaway($this->desturl); + } + +} + + +/** + * @brief HTTP POST entry point for Zot. + * + * 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. + * + * Magic Auth + * ========== + * + * So-called "magic auth" takes place by a special exchange. On the site where the "channel to be authenticated" lives (e.g. $mysite), + * a redirection is made via $mysite/magic to the zot endpoint of the remote site ($remotesite) with special GET parameters. + * + * The endpoint is typically https://$remotesite/post - or whatever was specified as the callback url in prior communications + * (we will bootstrap an address and fetch a zot info packet if possible where no prior communications exist) + * + * Five GET parameters are supplied: + * * auth => 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 + */ |