# We track the Mozilla "intermediate" compatibility TLS recommendations. # Note that these settings are repeated in the SMTP and IMAP configuration. # ssl_protocols has moved to nginx.conf in bionic, check there for enabled protocols. ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384; ssl_dhparam STORAGE_ROOT/ssl/dh4096.pem; # as recommended by http://nginx.org/en/docs/http/configuring_https_servers.html ssl_session_cache shared:SSL:50m; ssl_session_timeout 1d; # Buffer size of 1400 bytes fits in one MTU. # nginx 1.5.9+ ONLY ssl_buffer_size 1400; ssl_stapling on; ssl_stapling_verify on; resolver 127.0.0.1 valid=86400; resolver_timeout 10; # h/t https://gist.github.com/konklone/6532544