# Improve performance
ssl_session_timeout 1d;
ssl_session_cache shared:SSL:50m;
ssl_session_tickets off;
# Disable insecure cyphers
ssl_protocols TLSv1.2;
ssl_prefer_server_ciphers on;
# From https://mozilla.github.io/server-side-tls/ssl-config-generator/
# Oldest compatible clients: Firefox 27, Chrome 30, IE 11 on Windows 7, Edge, Opera 17, Safari 9, Android 5.0, and Java 8
# We don't have a lot of those cyphers (using Ubuntu 15.04), but CBC is insecure:
# https://blog.cloudflare.com/yet-another-padding-oracle-in-openssl-cbc-ciphersuites/
ssl_ciphers 'ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256';
# Unique DH Group, see https://weakdh.org/sysadmin.html
ssl_dhparam /etc/ssl/private/dhparams.pem;