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

nginx-tls.conf

#
# Name: nginx-tls.conf
# Auth: Chris van Steenbergen <[email protected]>
# Date: 13 June 2016
# Desc: Nginx SSL/TLS configuration for "A+" Qualys SSL Labs rating
#
# Enables HTTP2, PFS, HSTS and OCSP stapling. Configuration options not related
# to SSL/TLS are omitted here.
#
# Preparation: Strong 4096 bits DHE parameters (takes time)
# $ cd /etc/ssl/certs 
# $ openssl dhparam -out dhparam.pem 4096
#
# Let's Encrypt SSL Certificate
# $ letsencrypt-auto certonly -a webroot --webroot-path=/var/www/html -d domain.tld -d www.domain.ltd
#
# Example: https://www.ssllabs.com/ssltest/analyze.html?d=favoom.com
#

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

  # Redirect all non-https requests
  return 301 https://$server_name$request_uri;
}

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

  server_name domain.tld www.domain.tld;
  
  # Redirect all non-www to www
  if ($host !~* ^www\.){
        rewrite ^(.*)$ $scheme://www.$host$1;
  }

  # Certificate(s) and private key
  ssl_certificate /etc/letsencrypt/live/domain.tld/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/domain.ltd/privkey.pem;

  ssl_protocols TLSv1.2 TLSv1.1 TLSv1;
  
  ssl_prefer_server_ciphers on;
  ssl_ciphers AES256+EECDH:AES256+EDH:!aNULL;
  
  ssl_session_cache shared:SSL:10m;
  ssl_session_tickets off;
  ssl_session_timeout 24h;
  ssl_buffer_size 1400;

  # OCSP stapling
  ssl_stapling on;
  ssl_stapling_verify on;

  # Set HSTS
  add_header Strict-Transport-Security "max-age=63072000; includeSubdomains; preload";
  add_header X-Frame-Options DENY;
  add_header X-Content-Type-Options nosniff;
  
  # Set DHparam
  ssl_ecdh_curve secp384r1;
  ssl_dhparam /etc/ssl/certs/dhparam4096.pem;
  
  # Resolver
  resolver 8.8.4.4 8.8.8.8 valid=300s;
  resolver_timeout 5s;
  
}