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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2021 Arthur Schiwon <blizzz@arthur-schiwon.de>
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
*
* @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 OC\Security\VerificationToken;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IConfig;
use OCP\IUser;
use OCP\Security\ICrypto;
use OCP\Security\ISecureRandom;
use OCP\Security\VerificationToken\InvalidTokenException;
use OCP\Security\VerificationToken\IVerificationToken;
class VerificationToken implements IVerificationToken {
/** @var IConfig */
private $config;
/** @var ICrypto */
private $crypto;
/** @var ITimeFactory */
private $timeFactory;
/** @var ISecureRandom */
private $secureRandom;
public function __construct(
IConfig $config,
ICrypto $crypto,
ITimeFactory $timeFactory,
ISecureRandom $secureRandom
) {
$this->config = $config;
$this->crypto = $crypto;
$this->timeFactory = $timeFactory;
$this->secureRandom = $secureRandom;
}
/**
* @throws InvalidTokenException
*/
protected function throwInvalidTokenException(int $code): void {
throw new InvalidTokenException($code);
}
public function check(string $token, ?IUser $user, string $subject, string $passwordPrefix = ''): void {
if ($user === null || !$user->isEnabled()) {
$this->throwInvalidTokenException(InvalidTokenException::USER_UNKNOWN);
}
$encryptedToken = $this->config->getUserValue($user->getUID(), 'core', $subject, null);
if ($encryptedToken === null) {
$this->throwInvalidTokenException(InvalidTokenException::TOKEN_NOT_FOUND);
}
try {
$decryptedToken = $this->crypto->decrypt($encryptedToken, $passwordPrefix.$this->config->getSystemValue('secret'));
} catch (\Exception $e) {
$this->throwInvalidTokenException(InvalidTokenException::TOKEN_DECRYPTION_ERROR);
}
$splitToken = explode(':', $decryptedToken ?? '');
if (count($splitToken) !== 2) {
$this->throwInvalidTokenException(InvalidTokenException::TOKEN_INVALID_FORMAT);
}
if ($splitToken[0] < ($this->timeFactory->getTime() - 60 * 60 * 24 * 7) ||
$user->getLastLogin() > $splitToken[0]) {
$this->throwInvalidTokenException(InvalidTokenException::TOKEN_EXPIRED);
}
if (!hash_equals($splitToken[1], $token)) {
$this->throwInvalidTokenException(InvalidTokenException::TOKEN_MISMATCH);
}
}
public function create(IUser $user, string $subject, string $passwordPrefix = ''): string {
$token = $this->secureRandom->generate(
21,
ISecureRandom::CHAR_DIGITS.
ISecureRandom::CHAR_LOWER.
ISecureRandom::CHAR_UPPER
);
$tokenValue = $this->timeFactory->getTime() .':'. $token;
$encryptedValue = $this->crypto->encrypt($tokenValue, $passwordPrefix . $this->config->getSystemValue('secret'));
$this->config->setUserValue($user->getUID(), 'core', $subject, $encryptedValue);
return $token;
}
}
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