The frontend build now emits the sha256 hashes of the inline scripts of every page it writes into resources/public, the image moves them out of the document root, and the entrypoint splices them into the default script-src. This removes one of the two reasons why enforcing mode was not usable.
The hashes are computed on the rendered output rather than on the mustache templates, since the digest covers the exact bytes served between the script tags. All four served pages contribute, not just index.html: challenge.html handles the redirect, render.html is loaded by the exporter in a headless browser, and rasterizer.html is initialised by the frontend itself, so leaving any of them out would have broken those paths under enforcing mode. The storybook previews are excluded because that container does not serve them.
A bundle predating this change yields no hashes and the policy stays as it was, so older bundles keep building.
The three external locations were also passing through the security headers of their upstreams. raw.githubusercontent.com returns its own Content-Security-Policy and both it and fonts.googleapis.com return Strict-Transport-Security. Browsers enforce the intersection of every policy they receive, so the upstream one takes precedence on those responses, and the HSTS one lands on our own host, meaning a deployment that deliberately disables HSTS would get it set anyway by a third party. Hide all three at the proxy.
Signed-off-by: David Barragán Merino <david.barragan@kaleidos.net>
The three locations of nginx-external-locations.conf define their own add_header directives, which under nginx's inheritance rules discards every add_header from the enclosing server block. They were therefore served without any of the four security headers already shipped, and would equally have been served without the new CSP and HSTS ones.
Include the common file in all three, which is the pattern the development environment already follows for the equivalent locations.
Signed-off-by: David Barragán Merino <david.barragan@kaleidos.net>
