Nginx SSL/TLS configuration for "A+" Qualys SSL Labs rating

nginx-tls.conf

#
# Name: nginx-tls.conf
# Auth: Gavin Lloyd <gavinhungry@gmail.com>
# Desc: Nginx SSL/TLS configuration for "A+" Qualys SSL Labs rating
#
# Enables HTTP/2, PFS, HSTS and OCSP stapling. Configuration options not related
# to SSL/TLS are not included here.
#
# Additional tips:
#
#   * Enable CAA DNS record: https://sslmate.com/caa
#
# Example: https://www.ssllabs.com/ssltest/analyze.html?d=gavinhungry.com
#

server {
  listen [::]:80;
  listen      80;
  server_name domain.tld www.domain.tld;

  # Redirect all non-https requests
  rewrite ^ https://$host$request_uri? permanent;
}

server {
  listen [::]:443 ssl http2 default_server;
  listen      443 ssl http2 default_server;

  server_name domain.tld www.domain.tld;

  # Certificate(s) and private key
  ssl_certificate /etc/ssl/domain.crt;
  ssl_certificate_key /etc/ssl/domain.key;

  # RFC-7919 recommended: https://wiki.mozilla.org/Security/Server_Side_TLS#ffdhe4096
  ssl_dhparam /etc/ssl/ffdhe4096.pem;

  # Or, generate random dhparam
  # openssl dhparam 4096 -out /etc/ssl/dhparam.pem
  # ssl_dhparam /etc/ssl/dhparam.pem;

  ssl_protocols TLSv1.3 TLSv1.2;
  ssl_prefer_server_ciphers on;
  ssl_ecdh_curve secp521r1:secp384r1;
  ssl_ciphers EECDH+AESGCM:EECDH+AES256;

  ssl_session_cache shared:TLS:2m;
  ssl_buffer_size 4k;

  # OCSP stapling
  ssl_stapling on;
  ssl_stapling_verify on;
  resolver 1.1.1.1 1.0.0.1 [2606:4700:4700::1111] [2606:4700:4700::1001]; # Cloudflare

  # Set HSTS to 365 days
  add_header Strict-Transport-Security 'max-age=31536000; includeSubDomains; preload' always;
}