Friendica Communications Platform (please note that this is a clone of the repository at github, issues are handled there) https://friendi.ca
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<?php
/**
* @file src/Module/Owa.php
*/
namespace Friendica\Module;
use Friendica\BaseModule;
use Friendica\Core\System;
use Friendica\Database\DBM;
use Friendica\Model\Contact;
use Friendica\Model\Verify;
use Friendica\Util\HTTPSignature;
use dba;
/**
* @brief 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.
*
* Ported from Hubzilla: https://framagit.org/hubzilla/core/blob/master/Zotlabs/Module/Owa.php
*/
class Owa extends BaseModule
{
public static 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;
}
$sigblock = HTTPSignature::parseSigheader($_SERVER[$head]);
if ($sigblock) {
$keyId = $sigblock['keyId'];
if ($keyId) {
// Try to find the public contact entry of the handle.
$handle = str_replace('acct:', '', $keyId);
$cid = Contact::getIdForURL($handle);
$fields = ['id', 'url', 'addr', 'pubkey'];
$condition = ['id' => $cid];
$contact = dba::selectFirst('contact', $fields, $condition);
if (DBM::is_result($contact)) {
// Try to verify the signed header with the public key of the contact record
// we have found.
$verified = HTTPSig::verify('', $contact['pubkey']);
if ($verified && $verified['header_signed'] && $verified['header_valid']) {
logger('OWA header: ' . print_r($verified, true), LOGGER_DATA);
logger('OWA success: ' . $contact['addr'], LOGGER_DATA);
$ret['success'] = true;
$token = random_string(32);
// Store the generated token in the databe.
Verify::create('owt', 0, $token, $contact['addr']);
$result = '';
// Encrypt the token with the public contacts publik key.
// Only the specific public contact will be able to encrypt it.
// At a later time, we will compare weather the token we're getting
// is really the same token we have stored in the database.
openssl_public_encrypt($token, $result, $contact['pubkey']);
$ret['encrypted_token'] = base64url_encode($result);
} else {
logger('OWA fail: ' . $contact['id'] . ' ' . $contact['addr'] . ' ' . $contact['url'], LOGGER_DEBUG);
}
} else {
logger('Contact not found: ' . $handle, LOGGER_DEBUG);
}
}
}
}
}
System::jsonExit($ret, 'application/x-dfrn+json');
}
}