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reference/server-setup/nginx on vpn.md

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+# Nginx on VPN
+
+Configure server with OpenVPN and CA
+
+### Install OpenVPN
+
+`sudo apt install nginx`
+
+### nginx config
+
+`sudo vi /etc/nginx/sites-av.../default`
+
+```
+server {
+    listen 10.8.0.1:443 ssl;
+    # server_name _;  # You can omit this line or use '_'
+
+    ssl_certificate /etc/ssl/certs/nginx-selfsigned.crt;
+    ssl_certificate_key /etc/ssl/private/nginx-selfsigned.key;
+
+    # SSL settings
+    ssl_protocols TLSv1.2 TLSv1.3;
+    ssl_ciphers HIGH:!aNULL:!MD5;
+    ssl_prefer_server_ciphers on;
+    ssl_session_cache shared:SSL:10m;
+    ssl_session_timeout 10m;
+    ssl_session_tickets off;
+
+    # Add Diffie-Hellman parameter for DHE ciphersuites
+    ssl_dhparam /etc/ssl/certs/dhparam.pem;
+
+
+    # Add security headers
+    add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload" always;
+    add_header X-Content-Type-Options nosniff;
+    add_header X-Frame-Options DENY;
+    add_header X-XSS-Protection "1; mode=block";
+
+    # Reverse proxy settings
+    location / {
+        proxy_pass http://<SERVER_B_IP>:80;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+    }
+}
+```
+
+### SSL Certs
+
+```
+sudo openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
+  -keyout /etc/ssl/private/nginx-selfsigned.key \
+  -out /etc/ssl/certs/nginx-selfsigned.crt \
+  -subj "/CN=10.8.0.1"
+```
+
+`sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048`
+
+```
+sudo nginx -t
+sudo systemctl reload nginx
+```