bnomei/kirby3-security-headers

Kirby Plugin for easier Security Headers setup

Kirby Content Security Policy Header

Kirby Plugin for easier Security Headers setup.

🔐 Why should you use this plugin? Because security matters. Protecting your own or your clients websites and their customers data is important.

1. Automatic Setup
2. Setup: Headers
3. Setup: Loader
4. Setup: Setter
5. Frontend Nonce
6. Settings

Commercial Usage

Support open source!

This plugin is free but if you use it in a commercial project please consider to sponsor me or make a donation.
If my work helped you to make some cash it seems fair to me that I might get a little reward as well, right?

Be kind. Share a little. Thanks.

‐ Bruno
 

M	O	N	E	Y
Github sponsor	Patreon	Buy Me a Coffee	Paypal dontation	Hire me

Installation

• unzip master.zip as folder site/plugins/kirby3-security-headers or
• git submodule add https://github.com/bnomei/kirby3-security-headers.git site/plugins/kirby3-security-headers or
• composer require bnomei/kirby3-security-headers

Setup

Automatic

A route:before-hook takes care of setting the headers automatically unless one of the following conditions applies:

• Kirbys global debug mode is true
• Kirby determins it is a local setup
• the plugins setting enabled is set to false

Header

The following headers will be applied by default. You can override them in the config file.

/site/config/config.php

<?php
return [
    'bnomei.securityheaders.headers' => [
        "X-Powered-By" => "", // unset
        "X-Frame-Options" => "SAMEORIGIN",
        "X-XSS-Protection" => "1; mode=block",
        "X-Content-Type-Options" => "nosniff",
        "strict-transport-security" => "max-age=31536000; includeSubdomains",
        "Referrer-Policy" => "no-referrer-when-downgrade",
        "Permissions-Policy" => 'interest-cohort=()', // flock-off,
        // ... FEATURE POLICIES
    // other options...
];

Loader

The Loader is used to initally create the CSPBuilder object with a given set of data. You skip that, forward a file to load, provide an array or use the default loader file. Using a custom file is recommended when for example adding additional font-src for google web fonts.

/site/config/config.php

<?php
return [
    'bnomei.securityheaders.loader' => function () {
        // https://github.com/paragonie/csp-builder#example
        // null if you do NOT want to use default and/or just the setter
        /*
            return null;
         */
        // return path of file (json or yaml)
        // or an array of options for the cspbuilder
        /*
            return [...];
            return kirby()->roots()->site() . '/your-csp.json';
            return kirby()->roots()->site() . '/your-csp.yml';
        */
        // otherwise forward the default file from this plugin
        return __DIR__ . '/loader.json';
    },
    // other options...
];

Setter

The Setter is applied after the Loader. Use it to add dynamic stuff like hashes and nonces.

/site/config/config.php

<?php
return [
    'bnomei.securityheaders.setter' => function (\Bnomei\SecurityHeaders $instance) {
        // https://github.com/paragonie/csp-builder#build-a-content-security-policy-programmatically
        /** @var ParagonIE\CSPBuilder\CSPBuilder $csp */
        /*
            $csp = $instance->csp();
            $nonce = $instance->setNonce('my-inline-script');
            $csp->nonce('script-src', $nonce);
        */
        // in your template retrieve it again with
        /*
            $nonce = $page->nonce('my-inline-script');
            => `THIS-IS-THE-NONCE`
            $attr = $page->nonceAttr('my-inline-script');
            => `nonce="THIS-IS-THE-NONCE"`
        */
    },
    // other options...
];

TIP: nonces are set in the setter and later retrieved using $page->nonce(...) or $page->nonceAttr(...).

Panel and Frontend Nonces

This plugin automatically registers Kirbys nonce for the panel. For convenience it also provides you with a single frontend nonce to use as attribute in <link>, <style> and <script> elements. You can retrieve the nonce with site()->nonce() and the full attribute with site()->nonceAttr().

<?php ?>

<script nonce="<?= site()->nonce() ?>">
// ...
</script>

<style <?= site()->nonceAttr() ?>>

</style>

TIP: The srcset plugin uses that frontend nonce as well.

Settings

bnomei.securityheaders.	Default	Description
enabled	true or false or 'force'	will set headers
seed	callback	returns a seed for frontend nonce
headers	array	of sensible default values. modify as needed.
loader	callback	returning filepath or array
setter	callback	instance which allows customizing the CSPBuilder

Dependencies

• paragonie/csp-builder

Disclaimer

This plugin is provided "as is" with no guarantee. Use it at your own risk and always test it yourself before using it in a production environment. If you find any issues, please create a new issue.

License

MIT

It is discouraged to use this plugin in any project that promotes racism, sexism, homophobia, animal abuse, violence or any other form of hate speech.