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javascriptphpsymfonycontent-security-policyeasyadmin

Symfony 3 - Content Security Policy

I have a problem with Content Security Policy. Whenever I trying to include the JavaScript into my project, I get an content-security-policy error.

<!DOCTYPE html>
<html>
    <head>
        <title>Symfony</title>
        <script src="{{ asset('myscript.js') }}"></script>
    </head>
    <body>
      // ...
    </body>
</html>

What am I doing wrong?

I've already tried with:

Solution

  • Okay, I found a solution. I added to my code an event subscriber, which sets the "Content-Security-Policy" header.

    <?php

namespace AppBundle\Subscriber;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * Class ResponseSubscriber
 * @package AppBundle\Subscriber
 */
class ResponseSubscriber implements EventSubscriberInterface
{
    /** @inheritdoc */
    public static function getSubscribedEvents()
    {
        return [
            KernelEvents::RESPONSE => 'onResponse'
        ];
    }

    /**
     * Callback function for event subscriber
     * @param FilterResponseEvent $event
     */
    public function onResponse(FilterResponseEvent $event)
    {
        $response = $event->getResponse();

        $policy = "default-src 'self' 'unsafe-inline';"
            . "script-src 'self' 'unsafe-inline'";

        $response->headers->set("Content-Security-Policy", $policy);
        $response->headers->set("X-Content-Security-Policy", $policy);
        $response->headers->set("X-WebKit-CSP", $policy);
    }
}

    and

    # app/config/services.yml
services:
    # ...
    app.responseSubscriber:
        class: AppBundle\Subscriber\ResponseSubscriber
        autowire: true