Easily set Content Security Policy headers in Laravel with laravel-csp

Speaking of Content Security Policy, the folks at Spatie – who else? – have created a Laravel Package to easily take care or your CSP needs in a Laravel-based app.

Even without knowing the inner workings of the packge, the custom Policy below is easy to understand:

namespace App\Services\Csp;

use Spatie\Csp\Directive;
use Spatie\Csp\Policies\Policy as BasePolicy;

class Policy extends BasePolicy
{
    public function configure()
    {
        $this
            ->addGeneralDirectives()
            ->addDirectivesForBootstrap()
            ->addDirectivesForCarbon()
            ->addDirectivesForGoogleFonts()
            ->addDirectivesForGoogleAnalytics()
            ->addDirectivesForGoogleTagManager()
            ->addDirectivesForTwitter()
            ->addDirectivesForYouTube();
    }

    protected function addGeneralDirectives(): self
    {
        return $this
            ->addDirective(Directive::BASE, 'self')
            ->addNonceForDirective(Directive::SCRIPT)
            ->addDirective(Directive::SCRIPT, [
                'murze.be',
                'murze.be.test',
            ])
            ->addDirective(Directive::STYLE, [
                'murze.be',
                'murze.be.test',
                'unsafe-inline',
            ])
            ->addDirective(Directive::FORM_ACTION, [
                'murze.be',
                'murze.be.test',
                'sendy.murze.be',
            ])
            ->addDirective(Directive::IMG, [
                '*',
                'unsafe-inline',
                'data:',
            ])
            ->addDirective(Directive::OBJECT, 'none');
    }

    protected function addDirectivesForBootstrap(): self
    {
        return $this
            ->addDirective(Directive::FONT, ['*.bootstrapcdn.com'])
            ->addDirective(Directive::SCRIPT, ['*.bootstrapcdn.com'])
            ->addDirective(Directive::STYLE, ['*.bootstrapcdn.com']);
    }

    protected function addDirectivesForCarbon(): self
    {
        return $this->addDirective(Directive::SCRIPT, [
            'srv.carbonads.net',
            'script.carbonads.com',
            'cdn.carbonads.com',
        ]);
    }

    protected function addDirectivesForGoogleFonts(): self
    {
        return $this
            ->addDirective(Directive::FONT, 'fonts.gstatic.com')
            ->addDirective(Directive::SCRIPT, 'fonts.googleapis.com')
            ->addDirective(Directive::STYLE, 'fonts.googleapis.com');
    }

    protected function addDirectivesForGoogleAnalytics(): self
    {
        return $this->addDirective(Directive::SCRIPT, '*.google-analytics.com');
    }

    protected function addDirectivesForGoogleTagManager(): self
    {
        return $this->addDirective(Directive::SCRIPT, '*.googletagmanager.com');
    }

    protected function addDirectivesForTwitter(): self
    {
        return $this
            ->addDirective(Directive::SCRIPT, [
                'platform.twitter.com',
                '*.twimg.com',
            ])
            ->addDirective(Directive::STYLE, [
                'platform.twitter.com',
            ])
            ->addDirective(Directive::FRAME, [
                'platform.twitter.com',
                'syndication.twitter.com',
            ])
            ->addDirective(Directive::FORM_ACTION, [
                'platform.twitter.com',
                'syndication.twitter.com',
            ]);
    }

    protected function addDirectivesForYouTube(): self
    {
        return $this->addDirective(Directive::FRAME, '*.youtube.com');
    }
}

Using the policy above, Freek’s site now gets an A+ by the aforementioned securityheaders.io service

Using Content Security Policy headers in a Laravel app →
laravel-csp (GitHub) →