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0011. No external resources, strict CSP

  • Status: accepted

  • Date: 2026-11-07

Context

Principle P6: no outgoing call that the operator has not configured. A CDN would see every page view, and an injected script would see every household’s data. A strict Content Security Policy is the second line of defence after output escaping.

Decision

  • htmx is vendored in src/housecairn/static/vendor/htmx/ (version 2.0.11, unmodified file from the npm package, integrity recorded in its README.md, checked by a test, and loaded with a sha384 integrity attribute). Swagger UI comes from drf-spectacular-sidecar. Fonts are system fonts.

  • django-csp sends, on every response: default-src 'none'; script-src, style-src, font-src, connect-src, manifest-src 'self'; img-src 'self' data:; form-action 'self' (plus the OIDC provider’s origin when configured, because browsers apply form-action to the redirect after the sign-in form); frame-ancestors, base-uri, object-src 'none'.

  • No inline script, inline style, style attribute or event handler attribute in templates. Data for scripts goes in type="application/json" blocks, as allauth does. htmx runs with allowEval, allowScriptTags and includeIndicatorStyles off and selfRequestsOnly on.

  • drf-spectacular’s Swagger page is replaced by templates/api/swagger_ui.html, which uses the split view (init script served by the same view) and a stylesheet instead of an inline style block.

Consequences

  • Tests fail on an inline script or style in the main pages, on an external URL in templates or static files, and on a changed htmx file.

  • Some allauth pages not designed yet (email change) carry a style attribute, which the policy blocks; they will be overridden with the accounts lot.

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