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674c859a27
Build a conservative CSP from an inventory of what the embedded SPA
actually loads today: same-origin scripts/styles, Google Fonts CSS and
font files, data: + blob: for images, blob: for workers, and WASM
(viz-js needs wasm-unsafe-eval for Graphviz rendering).
Inline `<script>` hashes are extracted at server startup from the
embedded index.html, so the theme-bootstrap script doesn't drift from
the policy when the template changes. Tests cover:
- known-body hash stability
- whitespace preservation (browsers hash raw bytes between tags)
- external scripts are skipped (they're covered by script-src 'self')
- the embedded SPA template actually yields at least one hash
- the final policy includes the expected directives
Ships as Content-Security-Policy-Report-Only for the initial rollout.
Browsers report violations to DevTools without blocking anything, so
real-world usage surfaces any false positives before we flip to
enforcing. When reports are clean, swap the header name to
Content-Security-Policy in security_headers::apply_csp.
CSP notes:
- 'unsafe-inline' on style-src is a pragmatic concession for React
and Tailwind runtime-injected inline styles. Script-src remains
strict (hash-based).
- No 'strict-dynamic' — the entry chunks are same-origin and covered
by 'self'. Can be added later if dynamic script injection
violations appear.
- No report endpoint wired up yet. DevTools console is sufficient
for the tuning phase; add report-to + collector later.
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