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CSP headers for Drupal 7

The module tries to make it feasible to use CSP headers with Drupal 7 sites. It builds upon seckit and enhances it in a few ways:

  • It generates a nonce value in each (non-AJAX) request and adds it to all script tags.
  • It provides a hook hook_d7csp() that allows other modules to specify additional CSP header requirements. d7csp then takes care of merging all these requirements and passing them to seckit.

How to use this module

  • Download, install and enable the module and its dependencies as usual für Drupal 7.
  • Navigate to /admin/config/system/seckit and activate ‘Enable Content Security Policy’. The nonces are created automatically and most of your site should work this way.
  • Test your site and look at the browser console to identify CSP related errors. Either add the needed directive to the seckit configuration or to an implementation of hook_d7csp_hosts(). You will need additional CSP directives for other assets (styles, images, frames, …), API requests and additional scripts loaded through JavaScript.

Limitations and workarounds

jQuery 1

jQuery 1 uses eval() in some cases. An upgrade to jQuery 3 (with jQuery migrate) fixes this.

JavaScript loaded in AJAX requests

When loading additional JS in AJAX requests Drupal’s ajax.js just drops them in the DOM. This way they count as inline scripts and lead to CSP errors. In order to authenticate them with a nonce as well you have to apply a patch form the Drupal issue #3486305.