security.php

Cake Framwork , Excellent

<?php
/* SVN FILE: $Id: security.php 7118 2008-06-04 20:49:29Z gwoo $ */
/**
 * Short description for file.
 *
 * Long description for file
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) : Rapid Development Framework <http://www.cakephp.org/>
 * Copyright 2005-2008, Cake Software Foundation, Inc.
 *								1785 E. Sahara Avenue, Suite 490-204
 *								Las Vegas, Nevada 89104
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright		Copyright 2005-2008, Cake Software Foundation, Inc.
 * @link				http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package			cake
 * @subpackage		cake.cake.libs.controller.components
 * @since			CakePHP(tm) v 0.10.8.2156
 * @version			$Revision: 7118 $
 * @modifiedby		$LastChangedBy: gwoo $
 * @lastmodified	$Date: 2008-06-04 13:49:29 -0700 (Wed, 04 Jun 2008) $
 * @license			http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Short description for file.
 *
 * Long description for file
 *
 * @package		cake
 * @subpackage	cake.cake.libs.controller.components
 */
class SecurityComponent extends Object {
/**
 * The controller method that will be called if this request is black-hole'd
 *
 * @var string
 * @access public
 */
	var $blackHoleCallback = null;
/**
 * List of controller actions for which a POST request is required
 *
 * @var array
 * @access public
 * @see SecurityComponent::requirePost()
 */
	var $requirePost = array();
/**
 * List of controller actions for which a GET request is required
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireGet()
 */
	var $requireGet = array();
/**
 * List of controller actions for which a PUT request is required
 *
 * @var array
 * @access public
 * @see SecurityComponent::requirePut()
 */
	var $requirePut = array();
/**
 * List of controller actions for which a DELETE request is required
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireDelete()
 */
	var $requireDelete = array();
/**
 * List of actions that require an SSL-secured connection
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireSecure()
 */
	var $requireSecure = array();
/**
 * List of actions that require a valid authentication key
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireAuth()
 */
	var $requireAuth = array();
/**
 * List of actions that require an HTTP-authenticated login (basic or digest)
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireLogin()
 */
	var $requireLogin = array();
/**
 * Login options for SecurityComponent::requireLogin()
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireLogin()
 */
	var $loginOptions = array('type' => '', 'prompt' => null);
/**
 * An associative array of usernames/passwords used for HTTP-authenticated logins.
 * If using digest authentication, passwords should be MD5-hashed.
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireLogin()
 */
	var $loginUsers = array();
/**
 * Controllers from which actions of the current controller are allowed to receive
 * requests.
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireAuth()
 */
	var $allowedControllers = array();
/**
 * Actions from which actions of the current controller are allowed to receive
 * requests.
 *
 * @var array
 * @access public
 * @see SecurityComponent::requireAuth()
 */
	var $allowedActions = array();
/**
 * Form fields to disable
 *
 * @var array
 * @access public
 */
	var $disabledFields = array();
/**
 * Other components used by the Security component
 *
 * @var array
 * @access public
 */
	var $components = array('RequestHandler', 'Session');
/**
 * Holds the current action of the controller
 *
 * @var string
 */
	var $__action = null;
/**
 * Component startup. All security checking happens here.
 *
 * @param object $controller Instantiating controller
 * @access public
 */
	function startup(&$controller) {
		$this->__action = strtolower($controller->action);
		$this->__methodsRequired($controller);
		$this->__secureRequired($controller);
		$this->__authRequired($controller);
		$this->__loginRequired($controller);

		if ((!isset($controller->params['requested']) || $controller->params['requested'] != 1) && ($this->RequestHandler->isPost() || $this->RequestHandler->isPut())) {
			$this->__validatePost($controller);
		}

		$this->__generateToken($controller);
	}
/**
 * Sets the actions that require a POST request, or empty for all actions
 *
 * @access public
 */
	function requirePost() {
		$args = func_get_args();
		$this->__requireMethod('Post', $args);
	}
/**
 * Sets the actions that require a GET request, or empty for all actions
 *
 * @access public
 */
	function requireGet() {
		$args = func_get_args();
		$this->__requireMethod('Get', $args);
	}
/**
 * Sets the actions that require a PUT request, or empty for all actions
 *
 * @access public
 */
	function requirePut() {
		$args = func_get_args();
		$this->__requireMethod('Put', $args);
	}
/**
 * Sets the actions that require a DELETE request, or empty for all actions
 *
 * @access public
 */
	function requireDelete() {
		$args = func_get_args();
		$this->__requireMethod('Delete', $args);
	}
/**
 * Sets the actions that require a request that is SSL-secured, or empty for all actions
 *
 * @access public
 */
	function requireSecure() {
		$args = func_get_args();
		$this->__requireMethod('Secure', $args);
	}
/**
 * Sets the actions that require an authenticated request, or empty for all actions
 *
 * @access public
 */
	function requireAuth() {
		$args = func_get_args();
		$this->__requireMethod('Auth', $args);
	}
/**
 * Sets the actions that require an HTTP-authenticated request, or empty for all actions
 *
 * @access public
 */
	function requireLogin() {
		$args = func_get_args();
		$base = $this->loginOptions;

		foreach ($args as $i => $arg) {
			if (is_array($arg)) {
				$this->loginOptions = $arg;
				unset($args[$i]);
			}
		}
		$this->loginOptions = array_merge($base, $this->loginOptions);
		$this->__requireMethod('Login', $args);

		if (isset($this->loginOptions['users'])) {
			$this->loginUsers =& $this->loginOptions['users'];
		}
	}
/**
 * Attempts to validate the login credentials for an HTTP-authenticated request
 *
 * @param string $type Either 'basic', 'digest', or null. If null/empty, will try both.
 * @return mixed If successful, returns an array with login name and password, otherwise null.
 * @access public
 */
	function loginCredentials($type = null) {
		switch (strtolower($type)) {
			case 'basic':
				$login = array('username' => env('PHP_AUTH_USER'), 'password' => env('PHP_AUTH_PW'));
				if (!empty($login['username'])) {
					return $login;
				}
			break;
			case 'digest':
			default:
				$digest = null;

				if (version_compare(phpversion(), '5.1') != -1) {
					$digest = env('PHP_AUTH_DIGEST');
				} elseif (function_exists('apache_request_headers')) {
					$headers = apache_request_headers();
					if (isset($headers['Authorization']) && !empty($headers['Authorization']) && substr($headers['Authorization'], 0, 7) == 'Digest ') {
						$digest = substr($headers['Authorization'], 7);
					}
				} else {
					// Server doesn't support digest-auth headers
					trigger_error(__('SecurityComponent::loginCredentials() - Server does not support digest authentication', true), E_USER_WARNING);
				}

				if (!empty($digest)) {
					return $this->parseDigestAuthData($digest);
				}
			break;
		}
		return null;
	}
/**
 * Generates the text of an HTTP-authentication request header from an array of options..
 *
 * @param array $options Set of options for header
 * @return string HTTP-authentication request header
 * @access public
 */
	function loginRequest($options = array()) {
		$options = array_merge($this->loginOptions, $options);
		$this->__setLoginDefaults($options);
		$auth = 'WWW-Authenticate: ' . ucfirst($options['type']);
		$out = array('realm="' . $options['realm'] . '"');

		if (strtolower($options['type']) == 'digest') {
			$out[] = 'qop="auth"';
			$out[] = 'nonce="' . uniqid() . '"'; //str_replace('-', '', String::uuid())
			$out[] = 'opaque="' . md5($options['realm']).'"';
		}

		return $auth . ' ' . join(',', $out);
	}
/**
 * Parses an HTTP digest authentication response, and returns an array of the data, or null on failure.
 *
 * @param string $digest Digest authentication response
 * @return array Digest authentication parameters
 * @access public
 */
	function parseDigestAuthData($digest) {
		if (substr($digest, 0, 7) == 'Digest ') {
			$digest = substr($digest, 7);
		}
		$keys = array();
		$match = array();
		$req = array('nonce' => 1, 'nc' => 1, 'cnonce' => 1, 'qop' => 1, 'username' => 1, 'uri' => 1, 'response' => 1);
		preg_match_all('@(\w+)=([\'"]?)([a-zA-Z0-9=./\_-]+)\2@', $digest, $match, PREG_SET_ORDER);

		foreach ($match as $i) {
			$keys[$i[1]] = $i[3];
			unset($req[$i[1]]);
		}

		if (empty($req)) {
			return $keys;
		} else {
			return null;
		}
	}
/**
 * Generates a hash to be compared with an HTTP digest-authenticated response
 *
 * @param array $data HTTP digest response data, as parsed by SecurityComponent::parseDigestAuthData()
 * @return string Digest authentication hash
 * @access public
 * @see SecurityComponent::parseDigestAuthData()
 */
	function generateDigestResponseHash($data) {
		return md5(
			md5($data['username'] . ':' . $this->loginOptions['realm'] . ':' . $this->loginUsers[$data['username']]) .
			':' . $data['nonce'] . ':' . $data['nc'] . ':' . $data['cnonce'] . ':' . $data['qop'] . ':' .
			md5(env('REQUEST_METHOD') . ':' . $data['uri'])
		);
	}
/**
 * Black-hole an invalid request with a 404 error or custom callback. If SecurityComponent::$blackHoleCallback
 * is specified, it will use this callback by executing the method indicated in $error
 *
 * @param object $controller Instantiating controller
 * @param string $error Error method
 * @return mixed If specified, controller blackHoleCallback's response, or no return otherwise
 * @access public
 * @see SecurityComponent::$blackHoleCallback
 */
	function blackHole(&$controller, $error = '') {
		$this->Session->del('_Token');

		if ($this->blackHoleCallback == null) {
			$code = 404;
			if ($error == 'login') {
				$code = 401;
			}
			$controller->redirect(null, $code, true);