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123 lines
3.8 KiB
123 lines
3.8 KiB
<?php
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/*
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* This file is part of Twig.
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*
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* (c) 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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* @author Fabien Potencier <fabien@symfony.com>
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*/
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final class Twig_Sandbox_SecurityPolicy implements Twig_Sandbox_SecurityPolicyInterface
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{
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private $allowedTags;
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private $allowedFilters;
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private $allowedMethods;
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private $allowedProperties;
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private $allowedFunctions;
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public function __construct(array $allowedTags = [], array $allowedFilters = [], array $allowedMethods = [], array $allowedProperties = [], array $allowedFunctions = [])
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{
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$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 = [];
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foreach ($methods as $class => $m) {
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$this->allowedMethods[$class] = array_map('strtolower', is_array($m) ? $m : [$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_SecurityNotAllowedTagError(sprintf('Tag "%s" is not allowed.', $tag), $tag);
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}
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}
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foreach ($filters as $filter) {
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if (!in_array($filter, $this->allowedFilters)) {
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throw new Twig_Sandbox_SecurityNotAllowedFilterError(sprintf('Filter "%s" is not allowed.', $filter), $filter);
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}
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}
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foreach ($functions as $function) {
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if (!in_array($function, $this->allowedFunctions)) {
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throw new Twig_Sandbox_SecurityNotAllowedFunctionError(sprintf('Function "%s" is not allowed.', $function), $function);
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}
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}
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}
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public function checkMethodAllowed($obj, $method)
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{
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if ($obj instanceof Twig_Template || $obj instanceof Twig_Markup) {
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return true;
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}
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$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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$class = get_class($obj);
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throw new Twig_Sandbox_SecurityNotAllowedMethodError(sprintf('Calling "%s" method on a "%s" object is not allowed.', $method, $class), $class, $method);
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}
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}
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public function checkPropertyAllowed($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) ? $properties : [$properties]);
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break;
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}
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}
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if (!$allowed) {
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$class = get_class($obj);
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throw new Twig_Sandbox_SecurityNotAllowedPropertyError(sprintf('Calling "%s" property on a "%s" object is not allowed.', $property, $class), $class, $property);
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}
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}
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}
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class_alias('Twig_Sandbox_SecurityPolicy', 'Twig\Sandbox\SecurityPolicy', false);
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