https://git.zx2c4.com Ubuntu trusty cipher compatibility

[Jason A. Donenfeld]

I'm rolling with this EC-only setup:

ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:
ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-ECDSA-AES256-SHA:ECDHE-ECDSA-AES128-SHA;
ssl_ecdh_curve secp384r1;
ssl_prefer_server_ciphers on;
ssl_session_timeout 1d;
ssl_session_cache shared:TLS:50m;
ssl_session_tickets off;
ssl_stapling on;
ssl_stapling_verify on;
ssl_trusted_certificate /etc/ssl/certs/ca-certificates.crt;