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<?php
/**
* @author Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @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 <http://www.gnu.org/licenses/>.
*
*/
namespace OCA\TwoFactorBackupCodes\Service;
use BadMethodCallException;
use OCA\TwoFactorBackupCodes\Db\BackupCode;
use OCA\TwoFactorBackupCodes\Db\BackupCodeMapper;
use OCP\Activity\IManager;
use OCP\ILogger;
use OCP\IUser;
use OCP\Security\IHasher;
use OCP\Security\ISecureRandom;
class BackupCodeStorage {
private static $CODE_LENGTH = 16;
/** @var BackupCodeMapper */
private $mapper;
/** @var IHasher */
private $hasher;
/** @var ISecureRandom */
private $random;
/** @var IManager */
private $activityManager;
/** @var ILogger */
private $logger;
/**
* @param BackupCodeMapper $mapper
* @param ISecureRandom $random
* @param IHasher $hasher
* @param IManager $activityManager
* @param ILogger $logger
*/
public function __construct(BackupCodeMapper $mapper, ISecureRandom $random, IHasher $hasher,
IManager $activityManager, ILogger $logger) {
$this->mapper = $mapper;
$this->hasher = $hasher;
$this->random = $random;
$this->activityManager = $activityManager;
$this->logger = $logger;
}
/**
* @param IUser $user
* @return string[]
*/
public function createCodes(IUser $user, $number = 10) {
$result = [];
// Delete existing ones
$this->mapper->deleteCodes($user);
$uid = $user->getUID();
foreach (range(1, min([$number, 20])) as $i) {
$code = $this->random->generate(self::$CODE_LENGTH, ISecureRandom::CHAR_UPPER . ISecureRandom::CHAR_DIGITS);
$dbCode = new BackupCode();
$dbCode->setUserId($uid);
$dbCode->setCode($this->hasher->hash($code));
$dbCode->setUsed(0);
$this->mapper->insert($dbCode);
array_push($result, $code);
}
$this->publishEvent($user, 'codes_generated');
return $result;
}
/**
* Push an event the user's activity stream
*
* @param IUser $user
* @param string $event
*/
private function publishEvent(IUser $user, $event) {
$activity = $this->activityManager->generateEvent();
$activity->setApp('twofactor_backupcodes')
->setType('security')
->setAuthor($user->getUID())
->setAffectedUser($user->getUID())
->setSubject($event);
try {
$this->activityManager->publish($activity);
} catch (BadMethodCallException $e) {
$this->logger->warning('could not publish backup code creation activity', ['app' => 'twofactor_backupcodes']);
$this->logger->logException($e, ['app' => 'twofactor_backupcodes']);
}
}
/**
* @param IUser $user
* @return bool
*/
public function hasBackupCodes(IUser $user) {
$codes = $this->mapper->getBackupCodes($user);
return count($codes) > 0;
}
/**
* @param IUser $user
* @return array
*/
public function getBackupCodesState(IUser $user) {
$codes = $this->mapper->getBackupCodes($user);
$total = count($codes);
$used = 0;
array_walk($codes, function (BackupCode $code) use (&$used) {
if (1 === (int) $code->getUsed()) {
$used++;
}
});
return [
'enabled' => $total > 0,
'total' => $total,
'used' => $used,
];
}
/**
* @param IUser $user
* @param string $code
* @return bool
*/
public function validateCode(IUser $user, $code) {
$dbCodes = $this->mapper->getBackupCodes($user);
foreach ($dbCodes as $dbCode) {
if (0 === (int) $dbCode->getUsed() && $this->hasher->verify($code, $dbCode->getCode())) {
$dbCode->setUsed(1);
$this->mapper->update($dbCode);
return true;
}
}
return false;
}
}