107 lines
2.7 KiB
PHP
107 lines
2.7 KiB
PHP
<?php
|
|
/**
|
|
* @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\Util;
|
|
|
|
use Friendica\Core\Logger;
|
|
use Friendica\Model\APContact;
|
|
|
|
/**
|
|
* Implements JSON-LD signatures
|
|
*
|
|
* Ported from Osada: https://framagit.org/macgirvin/osada
|
|
*/
|
|
class LDSignature
|
|
{
|
|
public static function isSigned($data)
|
|
{
|
|
return !empty($data['signature']);
|
|
}
|
|
|
|
public static function getSigner($data)
|
|
{
|
|
if (!self::isSigned($data)) {
|
|
return false;
|
|
}
|
|
|
|
$actor = JsonLD::fetchElement($data, 'actor', 'id');
|
|
if (empty($actor) || !is_string($actor)) {
|
|
return false;
|
|
}
|
|
|
|
$profile = APContact::getByURL($actor);
|
|
if (empty($profile['pubkey'])) {
|
|
return false;
|
|
}
|
|
$pubkey = $profile['pubkey'];
|
|
|
|
$ohash = self::hash(self::signableOptions($data['signature']));
|
|
$dhash = self::hash(self::signableData($data));
|
|
|
|
$x = Crypto::rsaVerify($ohash . $dhash, base64_decode($data['signature']['signatureValue']), $pubkey);
|
|
Logger::notice('LD-verify', ['verified' => (int)$x, 'actor' => $profile['url']]);
|
|
|
|
if (empty($x)) {
|
|
return false;
|
|
} else {
|
|
return $actor;
|
|
}
|
|
}
|
|
|
|
public static function sign($data, $owner)
|
|
{
|
|
$options = [
|
|
'type' => 'RsaSignature2017',
|
|
'nonce' => Strings::getRandomHex(64),
|
|
'creator' => $owner['url'] . '#main-key',
|
|
'created' => DateTimeFormat::utcNow(DateTimeFormat::ATOM)
|
|
];
|
|
|
|
$ohash = self::hash(self::signableOptions($options));
|
|
$dhash = self::hash(self::signableData($data));
|
|
$options['signatureValue'] = base64_encode(Crypto::rsaSign($ohash . $dhash, $owner['uprvkey']));
|
|
|
|
return array_merge($data, ['signature' => $options]);
|
|
}
|
|
|
|
private static function signableData($data)
|
|
{
|
|
unset($data['signature']);
|
|
return $data;
|
|
}
|
|
|
|
private static function signableOptions($options)
|
|
{
|
|
$newopts = ['@context' => 'https://w3id.org/identity/v1'];
|
|
|
|
unset($options['type']);
|
|
unset($options['id']);
|
|
unset($options['signatureValue']);
|
|
|
|
return array_merge($newopts, $options);
|
|
}
|
|
|
|
private static function hash($obj)
|
|
{
|
|
return hash('sha256', JsonLD::normalize($obj));
|
|
}
|
|
}
|