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