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<?php
namespace Zotlabs\Module;
use Zotlabs\Web\HTTPSig;
/**
* OpenWebAuth verifier and token generator
* See https://macgirvin.com/wiki/mike/OpenWebAuth/Home
* Requests to this endpoint should be signed using HTTP Signatures
* using the 'Authorization: Signature' authentication method
* If the signature verifies a token is returned.
*
* This token may be exchanged for an authenticated cookie.
*/
class Owa extends \Zotlabs\Web\Controller {
function init() {
$ret = [ 'success' => false ];
foreach([ 'REDIRECT_REMOTE_USER', 'HTTP_AUTHORIZATION' ] as $head) {
if(array_key_exists($head,$_SERVER) && substr(trim($_SERVER[$head]),0,9) === 'Signature') {
if($head !== 'HTTP_AUTHORIZATION') {
$_SERVER['HTTP_AUTHORIZATION'] = $_SERVER[$head];
continue;
}
$sigblock = HTTPSig::parse_sigheader($_SERVER[$head]);
if($sigblock) {
$keyId = $sigblock['keyId'];
if($keyId) {
// Hubzilla connections can have both zot and zot6 hublocs
// The connections will usually be zot so match those first
$r = q("select * from hubloc left join xchan on hubloc_hash = xchan_hash
where ( hubloc_addr = '%s' or hubloc_id_url = '%s' ) and hubloc_network = 'zot' ",
dbesc(str_replace('acct:','',$keyId)),
dbesc($keyId)
);
// If nothing was found, try searching on any network
if (! $r) {
$r = q("select * from hubloc left join xchan on hubloc_hash = xchan_hash
where ( hubloc_addr = '%s' or hubloc_id_url = '%s' )",
dbesc(str_replace('acct:','',$keyId)),
dbesc($keyId)
);
}
// If nothing was found on any network, use network discovery and create a new record
if (! $r) {
$found = discover_by_webbie(str_replace('acct:','',$keyId));
if($found) {
$r = q("select * from hubloc left join xchan on hubloc_hash = xchan_hash
where ( hubloc_addr = '%s' or hubloc_id_url = '%s' ) ",
dbesc(str_replace('acct:','',$keyId)),
dbesc($keyId)
);
}
}
if ($r) {
foreach($r as $hubloc) {
$verified = HTTPSig::verify(file_get_contents('php://input'),$hubloc['xchan_pubkey']);
if($verified && $verified['header_signed'] && $verified['header_valid']) {
logger('OWA header: ' . print_r($verified,true),LOGGER_DATA);
logger('OWA success: ' . $hubloc['hubloc_addr'],LOGGER_DATA);
$ret['success'] = true;
$token = random_string(32);
\Zotlabs\Lib\Verify::create('owt',0,$token,$hubloc['hubloc_network'] . ',' . $hubloc['hubloc_addr']);
$result = '';
openssl_public_encrypt($token,$result,$hubloc['xchan_pubkey']);
$ret['encrypted_token'] = base64url_encode($result);
break;
}
else {
logger('OWA fail: ' . $hubloc['hubloc_id'] . ' ' . $hubloc['hubloc_addr']);
}
}
}
}
}
}
}
json_return_and_die($ret,'application/x-zot+json');
}
}
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