An optimal SSL configuration for nginx servers.

ssl.conf

# Sources:
# - https://cipherli.st/
# - https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html
# - https://haydenjames.io/nginx-tuning-tips-tls-ssl-https-ttfb-latency/

ssl_protocols TLSv1.2 TLSv1.3;
ssl_prefer_server_ciphers on;
ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH";

ssl_session_cache shared:SSL:10m;
ssl_session_tickets off;
ssl_session_timeout 10m;

ssl_stapling on;
ssl_stapling_verify on;
resolver 8.8.8.8 8.8.4.4 valid=300s;
resolver_timeout 5s;

#add_header Strict-Transport-Security "max-age=63072000; includeSubdomains";
#add_header X-Frame-Options DENY;
#add_header X-Content-Type-Options nosniff;

# Generate the DH prime with
# openssl dhparam -dsaparam -out /path/to/dhparam.pem 4096
ssl_dhparam /path/to/dhparam.pem;
ssl_ecdh_curve secp384r1;