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M4: security pass — strict CSP, header split, build-time scan

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All JS moved to external /site.js → script-src 'self' with no inline JS,
hashes or eval. Full header set via nginx (CSP, nosniff, frame-deny,
referrer, permissions, COOP/CORP); HSTS stays at the CF edge. Shared
headers include avoids the location add_header reset footgun. Build-time
secret/inline-script/third-party scan gate. SECURITY.md documents posture.
This commit is contained in:
Jonathon Wright
2026-06-17 17:12:57 +10:00
parent cb76a87c36
commit c1db5cec86
9 changed files with 210 additions and 64 deletions
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nginx/security-headers.conf
+14
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# Shared security headers. `include`d in the server block AND in every location
# that sets its own add_header (because add_header in a location REPLACES, not
# merges, inherited headers — the classic nginx footgun).
#
# HSTS + HTTP->HTTPS redirect are set at the Cloudflare edge (TLS terminates
# there), so they are intentionally NOT here.
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; font-src 'self'; connect-src 'self'; worker-src 'self'; manifest-src 'self'; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; upgrade-insecure-requests" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Frame-Options "DENY" always;
add_header Referrer-Policy "strict-origin-when-cross-origin" always;
add_header Permissions-Policy "camera=(), microphone=(), geolocation=(), payment=(), usb=(), interest-cohort=()" always;
add_header Cross-Origin-Opener-Policy "same-origin" always;
add_header Cross-Origin-Resource-Policy "same-origin" always;