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44 lines
1.9 KiB
Markdown
44 lines
1.9 KiB
Markdown
# Security Headers — nginx/posterg.conf
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## Headers in use (main server block — all pages)
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| Header | Value | Purpose |
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|--------|-------|---------|
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| `X-Frame-Options` | `SAMEORIGIN` | Prevent clickjacking |
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| `X-Content-Type-Options` | `nosniff` | Prevent MIME-type sniffing |
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| `Referrer-Policy` | `strict-origin-when-cross-origin` | Limit referrer leakage |
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| `Permissions-Policy` | `geolocation=(), microphone=(), camera=()` | Disable unused browser APIs |
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## Headers in use (`/admin/` location block)
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| Header | Value | Purpose |
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|--------|-------|---------|
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| `Content-Security-Policy` | `default-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; object-src 'none'; frame-ancestors 'none';` | Restrict resource origins; block embedding |
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| `X-Robots-Tag` | `noindex, nofollow` | Prevent search-engine indexing of admin |
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These were previously declared in `public/admin/.htaccess` as Apache
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`mod_headers` directives, which nginx silently ignores. They are now
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properly configured in `nginx/posterg.conf`.
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enforced directly; see `HTACCESS_TO_NGINX.md` for the full migration log.
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## Intentionally omitted headers
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### `X-XSS-Protection`
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This header was **removed** (was `"1; mode=block"`).
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**Why:** `X-XSS-Protection` is deprecated and removed from all modern browsers
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(Chrome 78+, Firefox never implemented it, Edge dropped it). Worse, the
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`mode=block` behaviour can be [actively exploited](https://portswigger.net/daily-swig/xss-protection-header-is-no-longer-supported-in-any-major-browser)
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to expose response bodies that would otherwise be blocked. Sending it provides
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no protection and may introduce risk.
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**Correct mitigation:** a proper `Content-Security-Policy` header (now done for
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`/admin/`; public-page CSP is todo item #11).
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## Pending headers
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| Header | Scope | Status |
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|--------|-------|--------|
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| `Content-Security-Policy` | Public pages (non-admin) | ⏳ todo item #11 |
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