619 lines
18 KiB
PHP
619 lines
18 KiB
PHP
<?php
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/**
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* Security Component
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Controller.Component
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* @since CakePHP(tm) v 0.10.8.2156
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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App::uses('Component', 'Controller');
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App::uses('String', 'Utility');
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App::uses('Hash', 'Utility');
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App::uses('Security', 'Utility');
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/**
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* The Security Component creates an easy way to integrate tighter security in
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* your application. It provides methods for various tasks like:
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*
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* - Restricting which HTTP methods your application accepts.
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* - CSRF protection.
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* - Form tampering protection
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* - Requiring that SSL be used.
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* - Limiting cross controller communication.
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*
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* @package Cake.Controller.Component
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* @link http://book.cakephp.org/2.0/en/core-libraries/components/security-component.html
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*/
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class SecurityComponent extends Component {
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/**
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* The controller method that will be called if this request is black-hole'd
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*
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* @var string
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*/
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public $blackHoleCallback = null;
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/**
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* List of controller actions for which a POST request is required
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*
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* @var array
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* @deprecated Use CakeRequest::onlyAllow() instead.
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* @see SecurityComponent::requirePost()
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*/
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public $requirePost = array();
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/**
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* List of controller actions for which a GET request is required
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*
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* @var array
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* @deprecated Use CakeRequest::onlyAllow() instead.
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* @see SecurityComponent::requireGet()
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*/
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public $requireGet = array();
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/**
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* List of controller actions for which a PUT request is required
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*
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* @var array
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* @deprecated Use CakeRequest::onlyAllow() instead.
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* @see SecurityComponent::requirePut()
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*/
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public $requirePut = array();
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/**
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* List of controller actions for which a DELETE request is required
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*
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* @var array
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* @deprecated Use CakeRequest::onlyAllow() instead.
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* @see SecurityComponent::requireDelete()
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*/
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public $requireDelete = array();
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/**
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* List of actions that require an SSL-secured connection
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*
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* @var array
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* @see SecurityComponent::requireSecure()
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*/
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public $requireSecure = array();
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/**
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* List of actions that require a valid authentication key
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*
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* @var array
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* @see SecurityComponent::requireAuth()
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*/
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public $requireAuth = array();
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/**
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* Controllers from which actions of the current controller are allowed to receive
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* requests.
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*
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* @var array
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* @see SecurityComponent::requireAuth()
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*/
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public $allowedControllers = array();
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/**
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* Actions from which actions of the current controller are allowed to receive
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* requests.
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*
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* @var array
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* @see SecurityComponent::requireAuth()
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*/
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public $allowedActions = array();
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/**
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* Deprecated property, superseded by unlockedFields.
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*
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* @var array
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* @deprecated
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* @see SecurityComponent::$unlockedFields
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*/
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public $disabledFields = array();
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/**
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* Form fields to exclude from POST validation. Fields can be unlocked
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* either in the Component, or with FormHelper::unlockField().
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* Fields that have been unlocked are not required to be part of the POST
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* and hidden unlocked fields do not have their values checked.
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*
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* @var array
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*/
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public $unlockedFields = array();
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/**
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* Actions to exclude from CSRF and POST validation checks.
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* Other checks like requireAuth(), requireSecure(),
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* requirePost(), requireGet() etc. will still be applied.
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*
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* @var array
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*/
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public $unlockedActions = array();
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/**
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* Whether to validate POST data. Set to false to disable for data coming from 3rd party
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* services, etc.
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*
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* @var boolean
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*/
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public $validatePost = true;
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/**
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* Whether to use CSRF protected forms. Set to false to disable CSRF protection on forms.
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*
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* @var boolean
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* @see http://www.owasp.org/index.php/Cross-Site_Request_Forgery_(CSRF)
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* @see SecurityComponent::$csrfExpires
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*/
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public $csrfCheck = true;
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/**
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* The duration from when a CSRF token is created that it will expire on.
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* Each form/page request will generate a new token that can only be submitted once unless
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* it expires. Can be any value compatible with strtotime()
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*
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* @var string
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*/
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public $csrfExpires = '+30 minutes';
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/**
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* Controls whether or not CSRF tokens are use and burn. Set to false to not generate
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* new tokens on each request. One token will be reused until it expires. This reduces
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* the chances of users getting invalid requests because of token consumption.
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* It has the side effect of making CSRF less secure, as tokens are reusable.
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*
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* @var boolean
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*/
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public $csrfUseOnce = true;
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/**
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* Control the number of tokens a user can keep open.
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* This is most useful with one-time use tokens. Since new tokens
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* are created on each request, having a hard limit on the number of open tokens
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* can be useful in controlling the size of the session file.
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*
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* When tokens are evicted, the oldest ones will be removed, as they are the most likely
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* to be dead/expired.
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*
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* @var integer
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*/
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public $csrfLimit = 100;
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/**
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* Other components used by the Security component
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*
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* @var array
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*/
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public $components = array('Session');
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/**
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* Holds the current action of the controller
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*
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* @var string
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*/
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protected $_action = null;
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/**
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* Request object
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*
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* @var CakeRequest
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*/
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public $request;
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/**
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* Component startup. All security checking happens here.
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*
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* @param Controller $controller Instantiating controller
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* @return void
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*/
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public function startup(Controller $controller) {
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$this->request = $controller->request;
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$this->_action = $this->request->params['action'];
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$this->_methodsRequired($controller);
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$this->_secureRequired($controller);
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$this->_authRequired($controller);
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$isPost = $this->request->is(array('post', 'put'));
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$isNotRequestAction = (
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!isset($controller->request->params['requested']) ||
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$controller->request->params['requested'] != 1
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);
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if ($this->_action == $this->blackHoleCallback) {
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return $this->blackHole($controller, 'auth');
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}
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if (!in_array($this->_action, (array)$this->unlockedActions) && $isPost && $isNotRequestAction) {
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if ($this->validatePost && $this->_validatePost($controller) === false) {
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return $this->blackHole($controller, 'auth');
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}
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if ($this->csrfCheck && $this->_validateCsrf($controller) === false) {
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return $this->blackHole($controller, 'csrf');
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}
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}
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$this->generateToken($controller->request);
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if ($isPost && is_array($controller->request->data)) {
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unset($controller->request->data['_Token']);
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}
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}
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/**
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* Sets the actions that require a POST request, or empty for all actions
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*
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* @return void
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* @deprecated Use CakeRequest::onlyAllow() instead.
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* @link http://book.cakephp.org/2.0/en/core-libraries/components/security-component.html#SecurityComponent::requirePost
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*/
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public function requirePost() {
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$args = func_get_args();
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$this->_requireMethod('Post', $args);
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}
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/**
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* Sets the actions that require a GET request, or empty for all actions
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*
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* @deprecated Use CakeRequest::onlyAllow() instead.
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* @return void
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*/
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public function requireGet() {
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$args = func_get_args();
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$this->_requireMethod('Get', $args);
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}
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/**
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* Sets the actions that require a PUT request, or empty for all actions
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*
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* @deprecated Use CakeRequest::onlyAllow() instead.
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* @return void
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*/
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public function requirePut() {
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$args = func_get_args();
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$this->_requireMethod('Put', $args);
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}
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/**
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* Sets the actions that require a DELETE request, or empty for all actions
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*
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* @deprecated Use CakeRequest::onlyAllow() instead.
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* @return void
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*/
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public function requireDelete() {
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$args = func_get_args();
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$this->_requireMethod('Delete', $args);
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}
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/**
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* Sets the actions that require a request that is SSL-secured, or empty for all actions
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*
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* @return void
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* @link http://book.cakephp.org/2.0/en/core-libraries/components/security-component.html#SecurityComponent::requireSecure
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*/
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public function requireSecure() {
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$args = func_get_args();
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$this->_requireMethod('Secure', $args);
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}
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/**
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* Sets the actions that require whitelisted form submissions.
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*
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* Adding actions with this method will enforce the restrictions
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* set in SecurityComponent::$allowedControllers and
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* SecurityComponent::$allowedActions.
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*
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* @return void
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* @link http://book.cakephp.org/2.0/en/core-libraries/components/security-component.html#SecurityComponent::requireAuth
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*/
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public function requireAuth() {
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$args = func_get_args();
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$this->_requireMethod('Auth', $args);
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}
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/**
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* Black-hole an invalid request with a 400 error or custom callback. If SecurityComponent::$blackHoleCallback
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* is specified, it will use this callback by executing the method indicated in $error
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*
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* @param Controller $controller Instantiating controller
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* @param string $error Error method
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* @return mixed If specified, controller blackHoleCallback's response, or no return otherwise
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* @see SecurityComponent::$blackHoleCallback
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* @link http://book.cakephp.org/2.0/en/core-libraries/components/security-component.html#handling-blackhole-callbacks
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* @throws BadRequestException
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*/
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public function blackHole(Controller $controller, $error = '') {
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if (!$this->blackHoleCallback) {
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throw new BadRequestException(__d('cake_dev', 'The request has been black-holed'));
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}
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return $this->_callback($controller, $this->blackHoleCallback, array($error));
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}
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/**
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* Sets the actions that require a $method HTTP request, or empty for all actions
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*
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* @param string $method The HTTP method to assign controller actions to
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* @param array $actions Controller actions to set the required HTTP method to.
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* @return void
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*/
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protected function _requireMethod($method, $actions = array()) {
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if (isset($actions[0]) && is_array($actions[0])) {
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$actions = $actions[0];
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}
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$this->{'require' . $method} = (empty($actions)) ? array('*') : $actions;
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}
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/**
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* Check if HTTP methods are required
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*
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* @param Controller $controller Instantiating controller
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* @return boolean true if $method is required
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*/
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protected function _methodsRequired(Controller $controller) {
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foreach (array('Post', 'Get', 'Put', 'Delete') as $method) {
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$property = 'require' . $method;
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if (is_array($this->$property) && !empty($this->$property)) {
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$require = $this->$property;
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if (in_array($this->_action, $require) || $this->$property == array('*')) {
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if (!$this->request->is($method)) {
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if (!$this->blackHole($controller, $method)) {
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return null;
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}
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}
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}
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}
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}
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return true;
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}
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/**
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* Check if access requires secure connection
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*
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* @param Controller $controller Instantiating controller
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* @return boolean true if secure connection required
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*/
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protected function _secureRequired(Controller $controller) {
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if (is_array($this->requireSecure) && !empty($this->requireSecure)) {
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$requireSecure = $this->requireSecure;
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if (in_array($this->_action, $requireSecure) || $this->requireSecure == array('*')) {
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if (!$this->request->is('ssl')) {
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if (!$this->blackHole($controller, 'secure')) {
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return null;
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}
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}
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}
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}
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return true;
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}
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/**
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* Check if authentication is required
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*
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* @param Controller $controller Instantiating controller
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* @return boolean true if authentication required
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*/
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protected function _authRequired(Controller $controller) {
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if (is_array($this->requireAuth) && !empty($this->requireAuth) && !empty($this->request->data)) {
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$requireAuth = $this->requireAuth;
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if (in_array($this->request->params['action'], $requireAuth) || $this->requireAuth == array('*')) {
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if (!isset($controller->request->data['_Token'])) {
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if (!$this->blackHole($controller, 'auth')) {
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return null;
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}
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}
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if ($this->Session->check('_Token')) {
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$tData = $this->Session->read('_Token');
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if (
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!empty($tData['allowedControllers']) &&
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!in_array($this->request->params['controller'], $tData['allowedControllers']) ||
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!empty($tData['allowedActions']) &&
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!in_array($this->request->params['action'], $tData['allowedActions'])
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) {
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if (!$this->blackHole($controller, 'auth')) {
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return null;
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}
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}
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} else {
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if (!$this->blackHole($controller, 'auth')) {
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return null;
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}
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}
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}
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}
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return true;
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}
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/**
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* Validate submitted form
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*
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* @param Controller $controller Instantiating controller
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* @return boolean true if submitted form is valid
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*/
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protected function _validatePost(Controller $controller) {
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if (empty($controller->request->data)) {
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return true;
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}
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$data = $controller->request->data;
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if (!isset($data['_Token']) || !isset($data['_Token']['fields']) || !isset($data['_Token']['unlocked'])) {
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return false;
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}
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$locked = '';
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$check = $controller->request->data;
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$token = urldecode($check['_Token']['fields']);
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$unlocked = urldecode($check['_Token']['unlocked']);
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if (strpos($token, ':')) {
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list($token, $locked) = explode(':', $token, 2);
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}
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unset($check['_Token']);
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$locked = explode('|', $locked);
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$unlocked = explode('|', $unlocked);
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$lockedFields = array();
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$fields = Hash::flatten($check);
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$fieldList = array_keys($fields);
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$multi = array();
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foreach ($fieldList as $i => $key) {
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if (preg_match('/(\.\d+)+$/', $key)) {
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$multi[$i] = preg_replace('/(\.\d+)+$/', '', $key);
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unset($fieldList[$i]);
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}
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}
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if (!empty($multi)) {
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$fieldList += array_unique($multi);
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}
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$unlockedFields = array_unique(
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array_merge((array)$this->disabledFields, (array)$this->unlockedFields, $unlocked)
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);
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foreach ($fieldList as $i => $key) {
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$isLocked = (is_array($locked) && in_array($key, $locked));
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if (!empty($unlockedFields)) {
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foreach ($unlockedFields as $off) {
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$off = explode('.', $off);
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$field = array_values(array_intersect(explode('.', $key), $off));
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$isUnlocked = ($field === $off);
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if ($isUnlocked) {
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break;
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}
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}
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}
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if ($isUnlocked || $isLocked) {
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unset($fieldList[$i]);
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if ($isLocked) {
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$lockedFields[$key] = $fields[$key];
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}
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}
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}
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sort($unlocked, SORT_STRING);
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sort($fieldList, SORT_STRING);
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ksort($lockedFields, SORT_STRING);
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$fieldList += $lockedFields;
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$unlocked = implode('|', $unlocked);
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$check = Security::hash(serialize($fieldList) . $unlocked . Configure::read('Security.salt'), 'sha1');
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return ($token === $check);
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}
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/**
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* Manually add CSRF token information into the provided request object.
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*
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* @param CakeRequest $request The request object to add into.
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* @return boolean
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*/
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public function generateToken(CakeRequest $request) {
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if (isset($request->params['requested']) && $request->params['requested'] === 1) {
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if ($this->Session->check('_Token')) {
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$request->params['_Token'] = $this->Session->read('_Token');
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}
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return false;
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}
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$authKey = Security::generateAuthKey();
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$token = array(
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'key' => $authKey,
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'allowedControllers' => $this->allowedControllers,
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'allowedActions' => $this->allowedActions,
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'unlockedFields' => array_merge($this->disabledFields, $this->unlockedFields),
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'csrfTokens' => array()
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);
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$tokenData = array();
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if ($this->Session->check('_Token')) {
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$tokenData = $this->Session->read('_Token');
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if (!empty($tokenData['csrfTokens']) && is_array($tokenData['csrfTokens'])) {
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$token['csrfTokens'] = $this->_expireTokens($tokenData['csrfTokens']);
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}
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}
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if ($this->csrfUseOnce || empty($token['csrfTokens'])) {
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$token['csrfTokens'][$authKey] = strtotime($this->csrfExpires);
|
|
}
|
|
if (!$this->csrfUseOnce) {
|
|
$csrfTokens = array_keys($token['csrfTokens']);
|
|
$token['key'] = $csrfTokens[0];
|
|
}
|
|
$this->Session->write('_Token', $token);
|
|
$request->params['_Token'] = array(
|
|
'key' => $token['key'],
|
|
'unlockedFields' => $token['unlockedFields']
|
|
);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Validate that the controller has a CSRF token in the POST data
|
|
* and that the token is legit/not expired. If the token is valid
|
|
* it will be removed from the list of valid tokens.
|
|
*
|
|
* @param Controller $controller A controller to check
|
|
* @return boolean Valid csrf token.
|
|
*/
|
|
protected function _validateCsrf(Controller $controller) {
|
|
$token = $this->Session->read('_Token');
|
|
$requestToken = $controller->request->data('_Token.key');
|
|
if (isset($token['csrfTokens'][$requestToken]) && $token['csrfTokens'][$requestToken] >= time()) {
|
|
if ($this->csrfUseOnce) {
|
|
$this->Session->delete('_Token.csrfTokens.' . $requestToken);
|
|
}
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Expire CSRF nonces and remove them from the valid tokens.
|
|
* Uses a simple timeout to expire the tokens.
|
|
*
|
|
* @param array $tokens An array of nonce => expires.
|
|
* @return array An array of nonce => expires.
|
|
*/
|
|
protected function _expireTokens($tokens) {
|
|
$now = time();
|
|
foreach ($tokens as $nonce => $expires) {
|
|
if ($expires < $now) {
|
|
unset($tokens[$nonce]);
|
|
}
|
|
}
|
|
$overflow = count($tokens) - $this->csrfLimit;
|
|
if ($overflow > 0) {
|
|
$tokens = array_slice($tokens, $overflow + 1, null, true);
|
|
}
|
|
return $tokens;
|
|
}
|
|
|
|
/**
|
|
* Calls a controller callback method
|
|
*
|
|
* @param Controller $controller Controller to run callback on
|
|
* @param string $method Method to execute
|
|
* @param array $params Parameters to send to method
|
|
* @return mixed Controller callback method's response
|
|
* @throws BadRequestException When a the blackholeCallback is not callable.
|
|
*/
|
|
protected function _callback(Controller $controller, $method, $params = array()) {
|
|
if (!is_callable(array($controller, $method))) {
|
|
throw new BadRequestException(__d('cake_dev', 'The request has been black-holed'));
|
|
}
|
|
return call_user_func_array(array(&$controller, $method), empty($params) ? null : $params);
|
|
}
|
|
|
|
}
|