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https://codeberg.org/streams/streams.git
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361 lines
12 KiB
PHP
361 lines
12 KiB
PHP
<?php
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namespace Zotlabs\Zot;
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class Auth {
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protected $test;
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protected $test_results;
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protected $debug_msg;
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protected $address;
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protected $desturl;
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protected $sec;
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protected $version;
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protected $delegate;
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protected $success;
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protected $delegate_success;
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protected $remote;
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protected $remote_service_class;
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protected $remote_level;
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protected $remote_hub;
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protected $dnt;
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function __construct($req) {
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$this->test = ((array_key_exists('test',$req)) ? intval($req['test']) : 0);
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$this->test_results = array('success' => false);
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$this->debug_msg = '';
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$this->success = false;
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$this->address = $req['auth'];
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$this->desturl = $req['dest'];
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$this->sec = $req['sec'];
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$this->version = $req['version'];
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$this->delegate = $req['delegate'];
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$c = get_sys_channel();
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if(! $c) {
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logger('unable to obtain response (sys) channel');
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$this->Debug('no local channels found.');
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$this->Finalise();
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}
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if(strpbrk($this->sec,'.:')) {
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logger('illegal security context');
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$this->Debug('illegal security context.');
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$this->Finalise();
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}
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$x = $this->GetHublocs($this->address);
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if($x) {
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foreach($x as $xx) {
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if($this->Verify($c,$xx))
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break;
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}
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}
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/**
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* @FIXME we really want to save the return_url in the session before we
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* visit rmagic. This does however prevent a recursion if you visit
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* 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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*/
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if(strstr($this->desturl,z_root() . '/rmagic'))
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goaway(z_root());
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$this->Finalise();
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}
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function GetHublocs($address) {
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// Try and find a hubloc for the person attempting to auth.
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// Since we're matching by address, we have to return all entries
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// some of which may be from re-installed hubs; and we'll need to
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// try each sequentially to see if one can pass the test
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$x = q("select * from hubloc left join xchan on xchan_hash = hubloc_hash
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where hubloc_addr = '%s' order by hubloc_id desc",
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dbesc($address)
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);
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if(! $x) {
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// finger them if they can't be found.
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$j = Finger::run($address, null);
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if ($j['success']) {
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import_xchan($j);
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$x = q("select * from hubloc left join xchan on xchan_hash = hubloc_hash
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where hubloc_addr = '%s' order by hubloc_id desc",
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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 ' . $address);
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$this->Debug('no hubloc found for ' . $address . ' and probing failed.');
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$this->Finalise();
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}
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return $x;
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}
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function Verify($channel,$hubloc) {
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logger('auth request received from ' . $hubloc['hubloc_addr'] );
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$this->remote = remote_channel();
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$this->remote_service_class = '';
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$this->remote_level = 0;
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$this->remote_hub = $hubloc['hubloc_url'];
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$this->dnt = 0;
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if(! $this->sec) {
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logger('missing security context.');
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if($this->test)
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$this->Debug('missing security context.');
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return false;
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}
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// check credentials and access
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// If they are already authenticated and haven't changed credentials,
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// we can save an expensive network round trip and improve performance.
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// Also check that they are coming from the same site as they authenticated with originally.
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$already_authed = (((remote_channel()) && ($hubloc['hubloc_hash'] == remote_channel())
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&& ($hubloc['hubloc_url'] === $_SESSION['remote_hub'])) ? true : false);
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if($this->delegate && $this->delegate !== $_SESSION['delegate_channel'])
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$already_authed = false;
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if($already_authed)
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return true;
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if(local_channel()) {
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// tell them to logout if they're logged in locally as anything but the target remote account
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// in which case just shut up because they don't need to be doing this at all.
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if (\App::$channel['channel_hash'] == $hubloc['xchan_hash']) {
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return true;
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}
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else {
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logger('already authenticated locally as somebody else.');
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notice( t('Remote authentication blocked. You are logged into this site locally. Please logout and retry.') . EOL);
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if($this->test) {
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$this->Debug('already logged in locally with a conflicting identity.');
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return false;
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}
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}
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return false;
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}
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// Auth packets MUST use ultra top-secret hush-hush mode - e.g. the entire packet is encrypted using the
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// site private key
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// The actual channel sending the packet ($c[0]) is not important, but this provides a
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// generic zot packet with a sender which can be verified
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$x = q("select site_crypto from site where site_url = '%s' limit 1",
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dbesc($hubloc['hubloc_url'])
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);
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$p = zot_build_packet($channel,$type = 'auth_check',
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array(array('guid' => $hubloc['hubloc_guid'],'guid_sig' => $hubloc['hubloc_guid_sig'])),
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$hubloc['hubloc_sitekey'], (($x) ? $x[0]['site_crypto'] : ''), $this->sec);
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$this->Debug('auth check packet created using sitekey ' . $hubloc['hubloc_sitekey']);
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$this->Debug('packet contents: ' . $p);
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$result = zot_zot($hubloc['hubloc_callback'],$p);
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if(! $result['success']) {
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logger('auth_check callback failed.');
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if($this->test)
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$this->Debug('auth check request to your site returned .' . print_r($result, true));
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return false;
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}
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$j = json_decode($result['body'], true);
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if(! $j) {
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logger('auth_check json data malformed.');
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if($this->test)
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$this->Debug('json malformed: ' . $result['body']);
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return false;
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}
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$this->Debug('auth check request returned ' . print_r($j, true));
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if(! $j['success'])
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return false;
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// legit response, but we do need to check that this wasn't answered by a man-in-middle
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if (! rsa_verify($this->sec . $hubloc['xchan_hash'],base64url_decode($j['confirm']),$hubloc['xchan_pubkey'])) {
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logger('final confirmation failed.');
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if($this->test)
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$this->Debug('final confirmation failed. ' . $sec . print_r($j,true) . print_r($hubloc,true));
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return false;
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}
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if (array_key_exists('service_class',$j))
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$this->remote_service_class = $j['service_class'];
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if (array_key_exists('level',$j))
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$this->remote_level = $j['level'];
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if (array_key_exists('DNT',$j))
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$this->dnt = $j['DNT'];
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// log them in
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if ($this->test) {
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// testing only - return the success result
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$this->test_results['success'] = true;
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$this->Debug('Authentication Success!');
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$this->Finalise();
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}
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$_SESSION['authenticated'] = 1;
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// check for delegation and if all is well, log them in locally with delegation restrictions
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$this->delegate_success = false;
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if($this->delegate) {
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$r = q("select * from channel left join xchan on channel_hash = xchan_hash where xchan_addr = '%s' limit 1",
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dbesc($this->delegate)
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);
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if ($r && intval($r[0]['channel_id'])) {
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$allowed = perm_is_allowed($r[0]['channel_id'],$hubloc['xchan_hash'],'delegate');
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if($allowed) {
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$_SESSION['delegate_channel'] = $r[0]['channel_id'];
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$_SESSION['delegate'] = $hubloc['xchan_hash'];
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$_SESSION['account_id'] = intval($r[0]['channel_account_id']);
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require_once('include/security.php');
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// this will set the local_channel authentication in the session
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change_channel($r[0]['channel_id']);
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$this->delegate_success = true;
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}
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}
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}
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if (! $this->delegate_success) {
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// normal visitor (remote_channel) login session credentials
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$_SESSION['visitor_id'] = $hubloc['xchan_hash'];
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$_SESSION['my_url'] = $hubloc['xchan_url'];
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$_SESSION['my_address'] = $this->address;
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$_SESSION['remote_service_class'] = $this->remote_service_class;
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$_SESSION['remote_level'] = $this->remote_level;
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$_SESSION['remote_hub'] = $this->remote_hub;
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$_SESSION['DNT'] = $this->dnt;
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}
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$arr = array('xchan' => $hubloc, 'url' => $this->desturl, 'session' => $_SESSION);
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call_hooks('magic_auth_success',$arr);
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\App::set_observer($hubloc);
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require_once('include/security.php');
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\App::set_groups(init_groups_visitor($_SESSION['visitor_id']));
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info(sprintf( t('Welcome %s. Remote authentication successful.'),$hubloc['xchan_name']));
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logger('mod_zot: auth success from ' . $hubloc['xchan_addr']);
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$this->success = true;
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return true;
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}
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function Debug($msg) {
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$this->debug_msg .= $msg . EOL;
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}
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function Finalise() {
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if($this->test) {
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$this->test_results['message'] = $this->debug_msg;
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json_return_and_die($this->test_results);
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}
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goaway($this->desturl);
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}
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}
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/**
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*
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* Magic Auth
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* ==========
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*
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* So-called "magic auth" takes place by a special exchange. On the site where the "channel to be authenticated" lives (e.g. $mysite),
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* a redirection is made via $mysite/magic to the zot endpoint of the remote site ($remotesite) with special GET parameters.
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*
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* The endpoint is typically https://$remotesite/post - or whatever was specified as the callback url in prior communications
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* (we will bootstrap an address and fetch a zot info packet if possible where no prior communications exist)
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*
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* Five GET parameters are supplied:
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* * auth => the urlencoded webbie (channel@host.domain) of the channel requesting access
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* * dest => the desired destination URL (urlencoded)
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* * sec => a random string which is also stored on $mysite for use during the verification phase.
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* * version => the zot revision
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* * delegate => optional urlencoded webbie of a local channel to invoke delegation rights for
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*
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* * test => (optional 1 or 0 - debugs the authentication exchange and returns a json response instead of redirecting the browser session)
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*
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* When this packet is received, an "auth-check" zot message is sent to $mysite.
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* (e.g. if $_GET['auth'] is foobar@podunk.edu, a zot packet is sent to the podunk.edu zot endpoint, which is typically /post)
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* If no information has been recorded about the requesting identity a zot information packet will be retrieved before
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* continuing.
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*
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* The sender of this packet is an arbitrary/random site channel. The recipients will be a single recipient corresponding
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* to the guid and guid_sig we have associated with the requesting auth identity
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*
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* \code{.json}
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* {
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* "type":"auth_check",
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* "sender":{
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* "guid":"kgVFf_...",
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* "guid_sig":"PT9-TApz...",
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* "url":"http:\/\/podunk.edu",
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* "url_sig":"T8Bp7j...",
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* "sitekey":"aMtgKTiirXrICP..."
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* },
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* "recipients":{
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* {
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* "guid":"ZHSqb...",
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* "guid_sig":"JsAAXi..."
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* }
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* }
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* "callback":"\/post",
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* "version":1,
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* "secret":"1eaa661",
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* "secret_sig":"eKV968b1..."
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* }
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* \endcode
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*
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* auth_check messages MUST use encapsulated encryption. This message is sent to the origination site, which checks the 'secret' to see
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* 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
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* destination channel's private key and base64url encoded. If everything checks out, a json packet is returned:
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*
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* \code{.json}
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* {
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* "success":1,
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* "confirm":"q0Ysovd1u...",
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* "service_class":(optional)
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* "level":(optional)
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* "DNT": (optional do-not-track - 1 or 0)
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* }
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* \endcode
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*
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* 'confirm' in this case is the base64url encoded RSA signature of the concatenation of 'secret' with the
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* base64url encoded whirlpool hash of the requestor's guid and guid_sig; signed with the source channel private key.
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* This prevents a man-in-the-middle from inserting a rogue success packet. Upon receipt and successful
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* verification of this packet, the destination site will redirect to the original destination URL and indicate a successful remote login.
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* Service_class can be used by cooperating sites to provide different access rights based on account rights and subscription plans. It is
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* a string whose contents are not defined by protocol. Example: "basic" or "gold".
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*
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* @param[in,out] \App &$a
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*/
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