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-rw-r--r--Zotlabs/Zot/Auth.php356
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diff --git a/Zotlabs/Zot/Auth.php b/Zotlabs/Zot/Auth.php
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+<?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
+ */