Content Security Policy (CSP) recommendations for CSS files that are

I am facing an issue where a third-party JavaScript file is being loaded into my application, which then injects an iframe onto the page. This iframe subsequently loads its own JavaScript that creates an inline style tag in the parent window.

Due to this sequence of events, I find myself needing to include "unsafe-inline" in my content security policy for the style-src directive. Is there a solution similar to "strict-dynamic" that could handle styles loaded in this manner? Or perhaps another way to allow this specific stylesheet without having to include "unsafe-inline" in my CSP?

The best idea I have at the moment is to periodically scan this redirected file and generate subresource integrity hashes for it to add to my CSP on a regular basis. However, I worry that this approach may be too delicate.

javascriptcsscontent-security-policy

Answer №1

Implementing CSS through the CSS Object Model (CSSOM) is compatible with CSP. For example:

document.getElementById(id).style.left = '343px';

If you encounter this scenario, it may be necessary to negotiate with the third-party provider to modify their JavaScript code.

source:

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