friendica/src/Module/Owa.php

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<?php
/**
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* @copyright Copyright (C) 2010-2021, the Friendica project
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
namespace Friendica\Module;
use Friendica\BaseModule;
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use Friendica\Core\Logger;
use Friendica\Core\System;
use Friendica\Database\DBA;
use Friendica\Model\Contact;
use Friendica\Model\OpenWebAuthToken;
use Friendica\Util\HTTPSignature;
use Friendica\Util\Strings;
/**
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* 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 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, $condition);
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if (DBA::isResult($contact)) {
// Try to verify the signed header with the public key of the contact record
// we have found.
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$verified = HTTPSignature::verifyMagic($contact['pubkey']);
if ($verified && $verified['header_signed'] && $verified['header_valid']) {
Logger::debug('OWA header', ['addr' => $contact['addr'], 'data' => $verified]);
$ret['success'] = true;
$token = Strings::getRandomHex(32);
// Store the generated token in the databe.
OpenWebAuthToken::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']);
$ret['encrypted_token'] = Strings::base64UrlEncode($result);
} else {
Logger::info('OWA fail', ['id' => $contact['id'], 'addr' => $contact['addr'], 'url' => $contact['url']]);
}
} else {
Logger::info('Contact not found', ['handle' => $handle]);
}
}
}
}
}
System::jsonExit($ret, 'application/x-zot+json');
}
}