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SandboxExtension.php
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SandboxExtension.php
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<?php
/*
* This file is part of Twig.
*
* (c) Fabien Potencier
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Twig\Extension;
use Twig\NodeVisitor\SandboxNodeVisitor;
use Twig\Sandbox\SecurityNotAllowedMethodError;
use Twig\Sandbox\SecurityNotAllowedPropertyError;
use Twig\Sandbox\SecurityPolicyInterface;
use Twig\Sandbox\SourcePolicyInterface;
use Twig\Source;
use Twig\TokenParser\SandboxTokenParser;
final class SandboxExtension extends AbstractExtension
{
private $sandboxedGlobally;
private $sandboxed;
private $policy;
private $sourcePolicy;
public function __construct(SecurityPolicyInterface $policy, $sandboxed = false, ?SourcePolicyInterface $sourcePolicy = null)
{
$this->policy = $policy;
$this->sandboxedGlobally = $sandboxed;
$this->sourcePolicy = $sourcePolicy;
}
public function getTokenParsers(): array
{
return [new SandboxTokenParser()];
}
public function getNodeVisitors(): array
{
return [new SandboxNodeVisitor()];
}
public function enableSandbox(): void
{
$this->sandboxed = true;
}
public function disableSandbox(): void
{
$this->sandboxed = false;
}
public function isSandboxed(?Source $source = null): bool
{
return $this->sandboxedGlobally || $this->sandboxed || $this->isSourceSandboxed($source);
}
public function isSandboxedGlobally(): bool
{
return $this->sandboxedGlobally;
}
private function isSourceSandboxed(?Source $source): bool
{
if (null === $source || null === $this->sourcePolicy) {
return false;
}
return $this->sourcePolicy->enableSandbox($source);
}
public function setSecurityPolicy(SecurityPolicyInterface $policy)
{
$this->policy = $policy;
}
public function getSecurityPolicy(): SecurityPolicyInterface
{
return $this->policy;
}
public function checkSecurity($tags, $filters, $functions, ?Source $source = null): void
{
if ($this->isSandboxed($source)) {
$this->policy->checkSecurity($tags, $filters, $functions);
}
}
public function checkMethodAllowed($obj, $method, int $lineno = -1, ?Source $source = null): void
{
if ($this->isSandboxed($source)) {
try {
$this->policy->checkMethodAllowed($obj, $method);
} catch (SecurityNotAllowedMethodError $e) {
$e->setSourceContext($source);
$e->setTemplateLine($lineno);
throw $e;
}
}
}
public function checkPropertyAllowed($obj, $property, int $lineno = -1, ?Source $source = null): void
{
if ($this->isSandboxed($source)) {
try {
$this->policy->checkPropertyAllowed($obj, $property);
} catch (SecurityNotAllowedPropertyError $e) {
$e->setSourceContext($source);
$e->setTemplateLine($lineno);
throw $e;
}
}
}
public function ensureToStringAllowed($obj, int $lineno = -1, ?Source $source = null)
{
if ($this->isSandboxed($source) && $obj instanceof \Stringable) {
try {
$this->policy->checkMethodAllowed($obj, '__toString');
} catch (SecurityNotAllowedMethodError $e) {
$e->setSourceContext($source);
$e->setTemplateLine($lineno);
throw $e;
}
}
return $obj;
}
}

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SandboxExtension.php (3 KB)

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