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<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Represents a security policy which need to be enforced when sandbox mode is enabled.
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*
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* @package twig
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_Sandbox_SecurityPolicy implements Twig_Sandbox_SecurityPolicyInterface
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{
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protected $allowedTags;
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protected $allowedFilters;
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protected $allowedMethods;
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protected $allowedProperties;
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protected $allowedFunctions;
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public function __construct(array $allowedTags = array(), array $allowedFilters = array(), array $allowedMethods = array(), array $allowedProperties = array(), array $allowedFunctions = array())
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{
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$this->allowedTags = $allowedTags;
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$this->allowedFilters = $allowedFilters;
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$this->setAllowedMethods($allowedMethods);
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$this->allowedProperties = $allowedProperties;
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$this->allowedFunctions = $allowedFunctions;
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}
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public function setAllowedTags(array $tags)
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{
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$this->allowedTags = $tags;
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}
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public function setAllowedFilters(array $filters)
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{
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$this->allowedFilters = $filters;
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}
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public function setAllowedMethods(array $methods)
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{
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$this->allowedMethods = array();
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foreach ($methods as $class => $m) {
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$this->allowedMethods[$class] = array_map('strtolower', is_array($m) ? $m : array($m));
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}
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}
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public function setAllowedProperties(array $properties)
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{
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$this->allowedProperties = $properties;
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}
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public function setAllowedFunctions(array $functions)
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{
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$this->allowedFunctions = $functions;
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}
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public function checkSecurity($tags, $filters, $functions)
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{
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foreach ($tags as $tag) {
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if (!in_array($tag, $this->allowedTags)) {
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throw new Twig_Sandbox_SecurityError(sprintf('Tag "%s" is not allowed.', $tag));
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}
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}
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foreach ($filters as $filter) {
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if (!in_array($filter, $this->allowedFilters)) {
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throw new Twig_Sandbox_SecurityError(sprintf('Filter "%s" is not allowed.', $filter));
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}
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}
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foreach ($functions as $function) {
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if (!in_array($function, $this->allowedFunctions)) {
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throw new Twig_Sandbox_SecurityError(sprintf('Function "%s" is not allowed.', $function));
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}
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}
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}
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public function checkMethodAllowed($obj, $method)
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{
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if ($obj instanceof Twig_TemplateInterface || $obj instanceof Twig_Markup) {
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return true;
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}
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$allowed = false;
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$method = strtolower($method);
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foreach ($this->allowedMethods as $class => $methods) {
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if ($obj instanceof $class) {
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$allowed = in_array($method, $methods);
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break;
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}
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}
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if (!$allowed) {
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throw new Twig_Sandbox_SecurityError(sprintf('Calling "%s" method on a "%s" object is not allowed.', $method, get_class($obj)));
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}
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}
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public function checkPropertyAllowed($obj, $property)
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{
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$allowed = false;
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foreach ($this->allowedProperties as $class => $properties) {
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if ($obj instanceof $class) {
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$allowed = in_array($property, is_array($properties) ? $properties : array($properties));
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break;
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}
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}
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if (!$allowed) {
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throw new Twig_Sandbox_SecurityError(sprintf('Calling "%s" property on a "%s" object is not allowed.', $property, get_class($obj)));
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}
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}
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}
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