nextcloud/lib/private/Authentication/TwoFactorAuth/Manager.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
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* @author Christoph Wurst <christoph@owncloud.com>
*
* @license AGPL-3.0
*
* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OC\Authentication\TwoFactorAuth;
use Exception;
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use OC;
use OC\App\AppManager;
use OC_App;
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use OCP\AppFramework\QueryException;
use OCP\Authentication\TwoFactorAuth\IProvider;
use OCP\IConfig;
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use OCP\ISession;
use OCP\IUser;
class Manager {
const SESSION_UID_KEY = 'two_factor_auth_uid';
const BACKUP_CODES_APP_ID = 'twofactor_backupcodes';
const BACKUP_CODES_PROVIDER_ID = 'backup_codes';
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/** @var AppManager */
private $appManager;
/** @var ISession */
private $session;
/** @var IConfig */
private $config;
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/**
* @param AppManager $appManager
* @param ISession $session
* @param IConfig $config
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*/
public function __construct(AppManager $appManager, ISession $session, IConfig $config) {
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$this->appManager = $appManager;
$this->session = $session;
$this->config = $config;
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}
/**
* Determine whether the user must provide a second factor challenge
*
* @param IUser $user
* @return boolean
*/
public function isTwoFactorAuthenticated(IUser $user) {
$twoFactorEnabled = ((int) $this->config->getUserValue($user->getUID(), 'core', 'two_factor_auth_disabled', 0)) === 0;
return $twoFactorEnabled && count($this->getProviders($user)) > 0;
}
/**
* Disable 2FA checks for the given user
*
* @param IUser $user
*/
public function disableTwoFactorAuthentication(IUser $user) {
$this->config->setUserValue($user->getUID(), 'core', 'two_factor_auth_disabled', 1);
}
/**
* Enable all 2FA checks for the given user
*
* @param IUser $user
*/
public function enableTwoFactorAuthentication(IUser $user) {
$this->config->deleteUserValue($user->getUID(), 'core', 'two_factor_auth_disabled');
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}
/**
* Get a 2FA provider by its ID
*
* @param IUser $user
* @param string $challengeProviderId
* @return IProvider|null
*/
public function getProvider(IUser $user, $challengeProviderId) {
$providers = $this->getProviders($user, true);
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return isset($providers[$challengeProviderId]) ? $providers[$challengeProviderId] : null;
}
/**
* @param IUser $user
* @return IProvider|null the backup provider, if enabled for the given user
*/
public function getBackupProvider(IUser $user) {
$providers = $this->getProviders($user, true);
return $providers[self::BACKUP_CODES_PROVIDER_ID];
}
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/**
* Get the list of 2FA providers for the given user
*
* @param IUser $user
* @param bool $includeBackupApp
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* @return IProvider[]
*/
public function getProviders(IUser $user, $includeBackupApp = false) {
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$allApps = $this->appManager->getEnabledAppsForUser($user);
$providers = [];
foreach ($allApps as $appId) {
if (!$includeBackupApp && $appId === self::BACKUP_CODES_APP_ID) {
continue;
}
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$info = $this->appManager->getAppInfo($appId);
if (isset($info['two-factor-providers'])) {
$providerClasses = $info['two-factor-providers'];
foreach ($providerClasses as $class) {
try {
$this->loadTwoFactorApp($appId);
$provider = OC::$server->query($class);
$providers[$provider->getId()] = $provider;
} catch (QueryException $exc) {
// Provider class can not be resolved
throw new Exception("Could not load two-factor auth provider $class");
}
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}
}
}
return array_filter($providers, function ($provider) use ($user) {
/* @var $provider IProvider */
return $provider->isTwoFactorAuthEnabledForUser($user);
});
}
/**
* Load an app by ID if it has not been loaded yet
*
* @param string $appId
*/
protected function loadTwoFactorApp($appId) {
if (!OC_App::isAppLoaded($appId)) {
OC_App::loadApp($appId);
}
}
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/**
* Verify the given challenge
*
* @param string $providerId
* @param IUser $user
* @param string $challenge
* @return boolean
*/
public function verifyChallenge($providerId, IUser $user, $challenge) {
$provider = $this->getProvider($user, $providerId);
if (is_null($provider)) {
return false;
}
$result = $provider->verifyChallenge($user, $challenge);
if ($result) {
$this->session->remove(self::SESSION_UID_KEY);
}
return $result;
}
/**
* Check if the currently logged in user needs to pass 2FA
*
* @param IUser $user the currently logged in user
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* @return boolean
*/
public function needsSecondFactor(IUser $user = null) {
if (is_null($user) || !$this->session->exists(self::SESSION_UID_KEY)) {
return false;
}
if (!$this->isTwoFactorAuthenticated($user)) {
// There is no second factor any more -> let the user pass
// This prevents infinite redirect loops when a user is about
// to solve the 2FA challenge, and the provider app is
// disabled the same time
$this->session->remove(self::SESSION_UID_KEY);
return false;
}
return true;
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}
/**
* Prepare the 2FA login (set session value)
*
* @param IUser $user
*/
public function prepareTwoFactorLogin(IUser $user) {
$this->session->set(self::SESSION_UID_KEY, $user->getUID());
}
}