scripts/upgrade-nginx-ssl

#!/bin/sh

# Based on https://ssl-config.mozilla.org/#server=nginx

# Disable Letsencrypt SSL configuraion (it is weak)
sed -i '/\/etc\/letsencrypt\/options-ssl-nginx.conf/ D' /etc/nginx/sites-available/*

# Disable built-in SSL config
sed -i -e '/ssl_protocols/D' -e '/ssl_prefer_server_ciphers/D' /etc/nginx/nginx.conf

# Update SSL config
cat > /etc/nginx/conf.d/ssl.conf << EOT
ssl_session_timeout 1d;
ssl_session_cache shared:SSL:50m;
ssl_session_tickets off;

ssl_dhparam /etc/nginx/ffdhe4096.pem;

ssl_protocols TLSv1.2 TLSv1.3;
ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384;
ssl_prefer_server_ciphers off;

ssl_stapling on;
ssl_stapling_verify on;
EOT

# Update DH params
if [ ! -f /etc/nginx/ffdhe4096.pem ]; then
    curl https://ssl-config.mozilla.org/ffdhe2048.txt > /etc/nginx/ffdhe4096.pem
fi

# Reload ngxin
systemctl reload nginx