# /etc/nginx/snippets/ssl-params.conf
#
# https://gist.github.com/VirtuBox/7d432c3c3d134cc3cb7e98b30a76c287
# https://stanislas.blog/2018/11/how-to-enable-tls-13-nginx/

# ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; (we no longer want TLS 1.0 and 1.1)
ssl_protocols TLSv1.2 TLSv1.3;
ssl_prefer_server_ciphers on;

ssl_ciphers 'TLS13+AESGCM+AES128:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';

ssl_session_cache shared:SSL:50m;
ssl_session_timeout 1d;
ssl_session_tickets off;
ssl_ecdh_curve X25519:sect571r1:secp521r1:secp384r1;

# add HSTS header with a value of 365 days
add_header Strict-Transport-Security "max-age=31536000";

# run this first (can take 5-10+ minutes on Raspberry Pi 3)
# `sudo openssl dhparam -out /etc/ssl/certs/dhparam.pem 2048`
ssl_dhparam /etc/ssl/certs/dhparam.pem;