nextcloud/lib/private/appframework/middleware/security/securitymiddleware.php

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<?php
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/**
* ownCloud - App Framework
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*
* @author Bernhard Posselt
* @copyright 2012 Bernhard Posselt <dev@bernhard-posselt.com>
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*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
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*
* This library is distributed in the hope that it will be useful,
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* 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.
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*
* You should have received a copy of the GNU Affero General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
*/
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namespace OC\AppFramework\Middleware\Security;
use OC\AppFramework\Http;
use OC\AppFramework\Utility\ControllerMethodReflector;
use OCP\AppFramework\Http\RedirectResponse;
use OCP\AppFramework\Middleware;
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use OCP\AppFramework\Http\Response;
use OCP\AppFramework\Http\JSONResponse;
use OCP\INavigationManager;
use OCP\IURLGenerator;
use OCP\IRequest;
use OCP\ILogger;
use OCP\AppFramework\Controller;
use OCP\Util;
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/**
* Used to do all the authentication and checking stuff for a controller method
* It reads out the annotations of a controller method and checks which if
* security things should be checked and also handles errors in case a security
* check fails
*/
class SecurityMiddleware extends Middleware {
private $navigationManager;
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private $request;
private $reflector;
private $appName;
private $urlGenerator;
private $logger;
private $isLoggedIn;
private $isAdminUser;
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/**
* @param IRequest $request
* @param ControllerMethodReflector $reflector
* @param INavigationManager $navigationManager
* @param IURLGenerator $urlGenerator
* @param ILogger $logger
* @param string $appName
* @param bool $isLoggedIn
* @param bool $isAdminUser
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*/
public function __construct(IRequest $request,
ControllerMethodReflector $reflector,
INavigationManager $navigationManager,
IURLGenerator $urlGenerator,
ILogger $logger,
$appName,
$isLoggedIn,
$isAdminUser){
$this->navigationManager = $navigationManager;
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$this->request = $request;
$this->reflector = $reflector;
$this->appName = $appName;
$this->urlGenerator = $urlGenerator;
$this->logger = $logger;
$this->isLoggedIn = $isLoggedIn;
$this->isAdminUser = $isAdminUser;
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}
/**
* This runs all the security checks before a method call. The
* security checks are determined by inspecting the controller method
* annotations
* @param string $controller the controllername or string
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* @param string $methodName the name of the method
* @throws SecurityException when a security check fails
*/
public function beforeController($controller, $methodName){
// this will set the current navigation entry of the app, use this only
// for normal HTML requests and not for AJAX requests
$this->navigationManager->setActiveEntry($this->appName);
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// security checks
$isPublicPage = $this->reflector->hasAnnotation('PublicPage');
if(!$isPublicPage) {
if(!$this->isLoggedIn) {
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throw new SecurityException('Current user is not logged in', Http::STATUS_UNAUTHORIZED);
}
if(!$this->reflector->hasAnnotation('NoAdminRequired')) {
if(!$this->isAdminUser) {
throw new SecurityException('Logged in user must be an admin', Http::STATUS_FORBIDDEN);
}
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}
}
// CSRF check - also registers the CSRF token since the session may be closed later
Util::callRegister();
if(!$this->reflector->hasAnnotation('NoCSRFRequired')) {
if(!$this->request->passesCSRFCheck()) {
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throw new SecurityException('CSRF check failed', Http::STATUS_PRECONDITION_FAILED);
}
}
/**
* FIXME: Use DI once available
* Checks if app is enabled (also inclues a check whether user is allowed to access the resource)
* The getAppPath() check is here since components such as settings also use the AppFramework and
* therefore won't pass this check.
*/
if(\OC_App::getAppPath($this->appName) !== false && !\OC_App::isEnabled($this->appName)) {
throw new SecurityException('App is not enabled', Http::STATUS_PRECONDITION_FAILED);
}
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}
/**
* If an SecurityException is being caught, ajax requests return a JSON error
* response and non ajax requests redirect to the index
* @param Controller $controller the controller that is being called
* @param string $methodName the name of the method that will be called on
* the controller
* @param \Exception $exception the thrown exception
* @throws \Exception the passed in exception if it cant handle it
* @return Response a Response object or null in case that the exception could not be handled
*/
public function afterException($controller, $methodName, \Exception $exception){
if($exception instanceof SecurityException){
if (stripos($this->request->getHeader('Accept'),'html')===false) {
$response = new JSONResponse(
array('message' => $exception->getMessage()),
$exception->getCode()
);
$this->logger->debug($exception->getMessage());
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} else {
// TODO: replace with link to route
$url = $this->urlGenerator->getAbsoluteURL('index.php');
// add redirect URL to redirect to the previous page after login
$url .= '?redirect_url=' . urlencode($this->request->server['REQUEST_URI']);
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$response = new RedirectResponse($url);
$this->logger->debug($exception->getMessage());
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}
return $response;
}
throw $exception;
}
}