Créer un certificat chaine

cat makeitsimple.be.crt GandiStandardSSLCA2.pem > makeitsimple.be.chain.crt

Créer une clé Diffie-Hellman

cd /etc/ssl
openssl dhparam -out dh.pem 4096

Créer un fichier de configuration modulaire

nano /etc/nginx/wildcard_example_com.ssl.conf

Et voici un exemple de contenu:

ssl_certificate /etc/ssl/certs/makeitsimple.be.chain.crt;
ssl_certificate_key /etc/ssl/private/makeitsimple.be.key;
 
ssl_session_timeout 24h;
ssl_session_cache shared:SSL:10m;
 
ssl_dhparam /etc/ssl/dh.pem;
 
ssl_protocols TLSv1.3 TLSv1.2;
ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';
ssl_prefer_server_ciphers on;
 
ssl_stapling on;
ssl_stapling_verify on;
ssl_trusted_certificate /etc/ssl/certs/gandi-standardssl-2.chain.pem;
resolver 127.0.0.1;

Faire un fichier stapling

cd /etc/ssl/certs/ \
&& echo -n '' > gandi-standardssl-2.chain.pem \
&& wget -q -O - https://www.gandi.net/static/CAs/GandiStandardSSLCA2.pem | tee -a gandi-standardssl-2.chain.pem> /dev/null \
&& cat USERTrust_RSA_Certification_Authority.pem | tee -a gandi-standardssl-2.chain.pem

Ajouter ces deux lignes dans chaque site-enabled de NGINX

  include /etc/nginx/wildcard_example_com.ssl.conf;
  add_header Strict-Transport-Security max-age=31536000;

Redémarrer nginx

service nginx restart

Vérifier sur https://www.ssllabs.com/ssltest/