Caddy adds none of these on its own. Add HSTS, X-Content-Type-Options, X-Frame-Options, Referrer-Policy and a CSP scoped to default-src 'self' plus the one external asset (Google Fonts). script-src/style-src need 'unsafe-inline' because both SPAs rely on inline onclick handlers and style="" attributes throughout — removing those is a separate, larger refactor. Validated with `caddy validate` and a live container curl check. Adds a static regression test asserting the header directives stay present in the Caddyfile, since nothing else in the Python suite exercises it. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
34 lines
1.7 KiB
Caddyfile
34 lines
1.7 KiB
Caddyfile
# SITE_ADDRESS is the domain to serve (e.g. lottery.example.com) — Caddy
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# automatically requests a Let's Encrypt certificate for it.
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#
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# Left at the default "localhost" (dev mode, no domain), Caddy detects it's
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# not a public hostname and issues a locally-trusted self-signed certificate
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# instead, via its internal CA. Browsers will still warn on first visit
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# unless that CA is explicitly trusted — expected for local/dev use.
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{$SITE_ADDRESS:localhost} {
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# gzip buffers output, which would delay delivery on the SSE stream
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# (/rounds/stream, app/api/routes/rounds.py) — it needs each event flushed
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# to the client immediately, not batched. Everything else still compresses.
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@not_sse {
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not path /rounds/stream
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}
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encode @not_sse gzip
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# B-43: Caddy adds none of these on its own. The JWT lives in
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# localStorage, so any XSS exfiltrates it — CSP is the main mitigation.
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# script-src/style-src need 'unsafe-inline' because both SPAs
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# (app/static/index.html, admin.html) use inline onclick handlers and
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# style="" attributes throughout; removing those is a separate,
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# larger refactor, not a header change. fonts.googleapis.com/gstatic.com
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# are the one external asset (the Google Fonts @import in style.css/admin.css).
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header {
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Strict-Transport-Security "max-age=31536000; includeSubDomains"
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X-Content-Type-Options "nosniff"
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X-Frame-Options "DENY"
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Referrer-Policy "strict-origin-when-cross-origin"
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Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com; font-src 'self' https://fonts.gstatic.com; img-src 'self'; connect-src 'self'; base-uri 'self'; form-action 'self'; frame-ancestors 'none'; object-src 'none'"
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}
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reverse_proxy app:8123
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}
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