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<?php
/* SVN FILE: $Id$ */
/**
* 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. (http://www.cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @filesource
* @copyright Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
* @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 $Revision$
* @modifiedby $LastChangedBy$
* @lastmodified $Date$
* @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();
/**
* Whether to validate POST data. Set to false to disable for data coming from 3rd party
* services, etc.
*
* @var boolean
* @access public
*/
var $validatePost = true;
/**
* 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);
$isPost = ($this->RequestHandler->isPost() || $this->RequestHandler->isPut());
$isRequestAction = (
!isset($controller->params['requested']) ||
$controller->params['requested'] != 1
);
if ($isPost && $isRequestAction && $this->validatePost) {
if ($this->_validatePost($controller) === false) {
if (!$this->blackHole($controller, 'auth')) {
return null;
}
}
}
$this->_generateToken($controller);
}
/**
* Sets the actions that require a POST request, or empty for all actions
*
* @return void
* @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
*
* @return void
* @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
*
* @return void
* @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
*
* @return void
* @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
*
* @return void
* @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
*
* @return void
* @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
*
* @return void
* @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(PHP_VERSION, '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("") . '"';
$out[] = 'opaque="' . md5($options['realm']).'"';
}
return $auth . ' ' . implode(',', $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;
}
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;
$controller->header($this->loginRequest());
}
$controller->redirect(null, $code, true);
} else {
return $this->_callback($controller, $this->blackHoleCallback, array($error));
}
}
/**
* Sets the actions that require a $method HTTP request, or empty for all actions
*
* @param string $method The HTTP method to assign controller actions to
* @param array $actions Controller actions to set the required HTTP method to.
* @return void
* @access protected
*/
function _requireMethod($method, $actions = array()) {
$this->{'require' . $method} = (empty($actions)) ? array('*'): $actions;
}
/**
* Check if HTTP methods are required
*
* @param object $controller Instantiating controller
* @return bool true if $method is required
* @access protected
*/
function _methodsRequired(&$controller) {
foreach (array('Post', 'Get', 'Put', 'Delete') as $method) {
$property = 'require' . $method;
if (is_array($this->$property) && !empty($this->$property)) {
$require = array_map('strtolower', $this->$property);
if (in_array($this->_action, $require) || $this->$property == array('*')) {
if (!$this->RequestHandler->{'is' . $method}()) {
if (!$this->blackHole($controller, strtolower($method))) {
return null;
}
}
}
}
}
return true;
}
/**
* Check if access requires secure connection
*
* @param object $controller Instantiating controller
* @return bool true if secure connection required
* @access protected
*/
function _secureRequired(&$controller) {
if (is_array($this->requireSecure) && !empty($this->requireSecure)) {
$requireSecure = array_map('strtolower', $this->requireSecure);
if (in_array($this->_action, $requireSecure) || $this->requireSecure == array('*')) {
if (!$this->RequestHandler->isSSL()) {
if (!$this->blackHole($controller, 'secure')) {
return null;
}
}
}
}
return true;
}
/**
* Check if authentication is required
*
* @param object $controller Instantiating controller
* @return bool true if authentication required
* @access protected
*/
function _authRequired(&$controller) {
if (is_array($this->requireAuth) && !empty($this->requireAuth) && !empty($controller->data)) {
$requireAuth = array_map('strtolower', $this->requireAuth);
if (in_array($this->_action, $requireAuth) || $this->requireAuth == array('*')) {
if (!isset($controller->data['_Token'] )) {
if (!$this->blackHole($controller, 'auth')) {
return null;
}
}
if ($this->Session->check('_Token')) {
$tData = unserialize($this->Session->read('_Token'));
if (!empty($tData['allowedControllers']) && !in_array($controller->params['controller'], $tData['allowedControllers']) || !empty($tData['allowedActions']) && !in_array($controller->params['action'], $tData['allowedActions'])) {
if (!$this->blackHole($controller, 'auth')) {
return null;
}
}
} else {
if (!$this->blackHole($controller, 'auth')) {
return null;
}
}
}
}
return true;
}
/**
* Check if login is required
*
* @param object $controller Instantiating controller
* @return bool true if login is required
* @access protected
*/
function _loginRequired(&$controller) {
if (is_array($this->requireLogin) && !empty($this->requireLogin)) {
$requireLogin = array_map('strtolower', $this->requireLogin);
if (in_array($this->_action, $requireLogin) || $this->requireLogin == array('*')) {
$login = $this->loginCredentials($this->loginOptions['type']);
if ($login == null) {
$controller->header($this->loginRequest());
if (!empty($this->loginOptions['prompt'])) {
$this->_callback($controller, $this->loginOptions['prompt']);
} else {
$this->blackHole($controller, 'login');
}
} else {
if (isset($this->loginOptions['login'])) {
$this->_callback($controller, $this->loginOptions['login'], array($login));
} else {
if (strtolower($this->loginOptions['type']) == 'digest') {
if ($login && isset($this->loginUsers[$login['username']])) {
if ($login['response'] == $this->generateDigestResponseHash($login)) {
return true;
}
}
$this->blackHole($controller, 'login');
} else {
if (
!(in_array($login['username'], array_keys($this->loginUsers)) &&
$this->loginUsers[$login['username']] == $login['password'])
) {
$this->blackHole($controller, 'login');
}
}
}
}
}
}
return true;
}
/**
* Validate submitted form
*
* @param object $controller Instantiating controller
* @return bool true if submitted form is valid
* @access protected
*/
function _validatePost(&$controller) {
if (empty($controller->data)) {
return true;
}
$data = $controller->data;
if (!isset($data['_Token']) || !isset($data['_Token']['fields']) || !isset($data['_Token']['key'])) {
return false;
}
$token = $data['_Token']['key'];
if ($this->Session->check('_Token')) {
$tokenData = unserialize($this->Session->read('_Token'));
if ($tokenData['expires'] < time() || $tokenData['key'] !== $token) {
return false;
}
}
$locked = null;
$check = $controller->data;
$token = urldecode($check['_Token']['fields']);
if (strpos($token, ':')) {
list($token, $locked) = explode(':', $token, 2);
}
unset($check['_Token']);
$lockedFields = array();
$fields = Set::flatten($check);
$fieldList = array_keys($fields);
$locked = unserialize(str_rot13($locked));
$multi = array();
foreach ($fieldList as $i => $key) {
if (preg_match('/\.\d+$/', $key)) {
$multi[$i] = preg_replace('/\.\d+$/', '', $key);
unset($fieldList[$i]);
}
}
if (!empty($multi)) {
$fieldList += array_unique($multi);
}
foreach ($fieldList as $i => $key) {
$isDisabled = false;
$isLocked = (is_array($locked) && in_array($key, $locked));
if (!empty($this->disabledFields)) {
foreach ((array)$this->disabledFields as $disabled) {
$disabled = explode('.', $disabled);
$field = array_values(array_intersect(explode('.', $key), $disabled));
$isDisabled = ($field === $disabled);
if ($isDisabled) {
break;
}
}
}
if ($isDisabled || $isLocked) {
unset($fieldList[$i]);
if ($isLocked) {
$lockedFields[$key] = $fields[$key];
}
}
}
sort($fieldList, SORT_STRING);
ksort($lockedFields, SORT_STRING);
$fieldList += $lockedFields;
$check = Security::hash(serialize($fieldList) . Configure::read('Security.salt'));
return ($token === $check);
}
/**
* Add authentication key for new form posts
*
* @param object $controller Instantiating controller
* @return bool Success
* @access protected
*/
function _generateToken(&$controller) {
if (isset($controller->params['requested']) && $controller->params['requested'] === 1) {
if ($this->Session->check('_Token')) {
$tokenData = unserialize($this->Session->read('_Token'));
$controller->params['_Token'] = $tokenData;
}
return false;
}
$authKey = Security::generateAuthKey();
$expires = strtotime('+' . Security::inactiveMins() . ' minutes');
$token = array(
'key' => $authKey,
'expires' => $expires,
'allowedControllers' => $this->allowedControllers,
'allowedActions' => $this->allowedActions,
'disabledFields' => $this->disabledFields
);
if (!isset($controller->data)) {
$controller->data = array();
}
if ($this->Session->check('_Token')) {
$tokenData = unserialize($this->Session->read('_Token'));
$valid = (
isset($tokenData['expires']) &&
$tokenData['expires'] > time() &&
isset($tokenData['key'])
);
if ($valid) {
$token['key'] = $tokenData['key'];
}
}
$controller->params['_Token'] = $token;
$this->Session->write('_Token', serialize($token));
return true;
}
/**
* Sets the default login options for an HTTP-authenticated request
*
* @param array $options Default login options
* @return void
* @access protected
*/
function _setLoginDefaults(&$options) {
$options = array_merge(array(
'type' => 'basic',
'realm' => env('SERVER_NAME'),
'qop' => 'auth',
'nonce' => String::uuid()
), array_filter($options));
$options = array_merge(array('opaque' => md5($options['realm'])), $options);
}
/**
* Calls a controller callback method
*
* @param object $controller Controller to run callback on
* @param string $method Method to execute
* @param array $params Parameters to send to method
* @return mixed Controller callback method's response
* @access protected
*/
function _callback(&$controller, $method, $params = array()) {
if (is_callable(array($controller, $method))) {
return call_user_func_array(array(&$controller, $method), empty($params) ? null : $params);
} else {
// Debug::warning('Callback method ' . $method . ' in controller ' . get_class($controller)
return null;
}
}
}
?>
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