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Christop Rumpel:
Content Security Policy, Hash-Algorithm and Turbolinks
Mar 20, 2018 @ 09:31:47

Following up on his previous Content Security Policy and Laravel posts, Christoph Rumpel continues the series and looks at how to fix his site's integration with Turbolinks. Turbolinks makes it easier to load only partial portions of a site when links are clicked rather than reloading the entire page.

My last week was all about Content Security Policy (CSP). It was an emotional rollercoaster. I loved the concept of CSP and was happy that I managed to integrate it into my site. But then I noticed that caching and Turbolinks weren't working anymore because of the CSP nonces. I had to turn them off. Then yesterday, I found a way to use CSP nonces with the Laravel Response Caching package. I was super excited about it.

Still, Turbolinks weren't working.

He starts by describing the issue with the CSP policy and the Turbolinks tool, mostly that the nonces in the response header no longer match the ones in the embedded script tags of the new content. He ended up finding a solution in the hash-algorithm CSP directive. This allowed him to create a hash of the requested script and validate it without the need for a nonce. He includes the code changes to his previous Laravel Response Cache middleware setting this hash-algorithm directive on the script tag output.

tagged: contentsecuritypolicy csp laravel response hashalgorithm turbolinks

Link: https://christoph-rumpel.com/2018/03/content-security-policy-hash-algorithm-and-turbolinks