136 lines
3.6 KiB
PHP
136 lines
3.6 KiB
PHP
<?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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namespace Twig\Extension;
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use Twig\NodeVisitor\SandboxNodeVisitor;
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use Twig\Sandbox\SecurityNotAllowedMethodError;
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use Twig\Sandbox\SecurityNotAllowedPropertyError;
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use Twig\Sandbox\SecurityPolicyInterface;
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use Twig\Sandbox\SourcePolicyInterface;
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use Twig\Source;
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use Twig\TokenParser\SandboxTokenParser;
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final class SandboxExtension extends AbstractExtension
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{
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private $sandboxedGlobally;
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private $sandboxed;
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private $policy;
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private $sourcePolicy;
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public function __construct(SecurityPolicyInterface $policy, $sandboxed = false, ?SourcePolicyInterface $sourcePolicy = null)
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{
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$this->policy = $policy;
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$this->sandboxedGlobally = $sandboxed;
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$this->sourcePolicy = $sourcePolicy;
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}
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public function getTokenParsers(): array
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{
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return [new SandboxTokenParser()];
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}
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public function getNodeVisitors(): array
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{
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return [new SandboxNodeVisitor()];
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}
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public function enableSandbox(): void
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{
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$this->sandboxed = true;
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}
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public function disableSandbox(): void
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{
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$this->sandboxed = false;
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}
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public function isSandboxed(?Source $source = null): bool
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{
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return $this->sandboxedGlobally || $this->sandboxed || $this->isSourceSandboxed($source);
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}
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public function isSandboxedGlobally(): bool
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{
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return $this->sandboxedGlobally;
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}
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private function isSourceSandboxed(?Source $source): bool
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{
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if (null === $source || null === $this->sourcePolicy) {
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return false;
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}
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return $this->sourcePolicy->enableSandbox($source);
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}
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public function setSecurityPolicy(SecurityPolicyInterface $policy)
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{
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$this->policy = $policy;
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}
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public function getSecurityPolicy(): SecurityPolicyInterface
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{
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return $this->policy;
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}
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public function checkSecurity($tags, $filters, $functions, ?Source $source = null): void
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{
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if ($this->isSandboxed($source)) {
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$this->policy->checkSecurity($tags, $filters, $functions);
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}
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}
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public function checkMethodAllowed($obj, $method, int $lineno = -1, ?Source $source = null): void
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{
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if ($this->isSandboxed($source)) {
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try {
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$this->policy->checkMethodAllowed($obj, $method);
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} catch (SecurityNotAllowedMethodError $e) {
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$e->setSourceContext($source);
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$e->setTemplateLine($lineno);
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throw $e;
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}
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}
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}
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public function checkPropertyAllowed($obj, $property, int $lineno = -1, ?Source $source = null): void
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{
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if ($this->isSandboxed($source)) {
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try {
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$this->policy->checkPropertyAllowed($obj, $property);
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} catch (SecurityNotAllowedPropertyError $e) {
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$e->setSourceContext($source);
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$e->setTemplateLine($lineno);
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throw $e;
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}
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}
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}
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public function ensureToStringAllowed($obj, int $lineno = -1, ?Source $source = null)
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{
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if ($this->isSandboxed($source) && \is_object($obj) && method_exists($obj, '__toString')) {
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try {
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$this->policy->checkMethodAllowed($obj, '__toString');
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} catch (SecurityNotAllowedMethodError $e) {
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$e->setSourceContext($source);
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$e->setTemplateLine($lineno);
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throw $e;
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}
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}
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return $obj;
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}
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}
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