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fix: harden security based on pentest scan findings

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- Add Content-Security-Policy to main nginx server block (was only on /admin/)
- Add Cross-Origin-Opener-Policy and Cross-Origin-Resource-Policy headers
- Add includeSubDomains to HSTS header
- Set HttpOnly, Secure, SameSite=Lax session cookie params on public pages
  (AdminAuth already hardens the /admin session with SameSite=Strict)
- Update xamxam.conf.reference and SECURITY_HEADERS.md to match
This commit is contained in:
Pontoporeia
2026-05-11 18:03:14 +02:00
parent 4717b4d67e
commit 04094d802d
7 changed files with 37 additions and 484 deletions
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6
nginx/xamxam.conf.reference
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@@ -34,12 +34,14 @@ server {
index index.php index.html index.htm;
# Security headers
add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload;" always;
add_header Content-Security-Policy "default-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; object-src 'none'; frame-ancestors 'none';" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Content-Type-Options "nosniff" always;
# X-XSS-Protection intentionally omitted — deprecated and counterproductive in modern browsers.
# CSP (Content-Security-Policy) is the correct mitigation.
add_header Referrer-Policy "strict-origin-when-cross-origin" always;
add_header Permissions-Policy "geolocation=(), microphone=(), camera=()" always;
add_header Cross-Origin-Opener-Policy "same-origin" always;
add_header Cross-Origin-Resource-Policy "same-origin" always;
# Server tokens already disabled in nginx.conf
# server_tokens off;