#
# /usr/local/etc/nginx/conf.d/ssl.conf
#
# SSL/TLS settings for Nginx
#
# Aaron LI
# 2017-04-25
#
# Credits
# -------
# * Cipherli.st - Strong Ciphers for Apache, nginx and Lighttpd
#   https://cipherli.st/
# * Strong SSL Security on nginx
#   https://raymii.org/s/tutorials/Strong_SSL_Security_On_nginx.html
# * Mozilla - Security - Server Side TLS
#   https://wiki.mozilla.org/Security/Server_Side_TLS
#   https://mozilla.github.io/server-side-tls/ssl-config-generator/
# * Let's Encrypt & Nginx
#   https://letsecure.me/secure-web-deployment-with-lets-encrypt-and-nginx/
# * Nginx SSL and TLS Deployment Best Practice
#   https://www.linode.com/docs/web-servers/nginx/nginx-ssl-and-tls-deployment-best-practices
# * Best nginx configuration for improved security (and performance)
#   https://gist.github.com/plentz/6737338
# * Hardening your HTTP response headers
#   https://scotthelme.co.uk/hardening-your-http-response-headers/
#
# Tools
# -----
# * Qualys SSL Labs SSL Server Test
#   https://www.ssllabs.com/ssltest/
# * Security Headers Analyzer
#   https://securityheaders.io/
#


# Diffie-Hellman group:
#     $ openssl dhparam -out /usr/local/etc/ssl/dhparam2048.pem 2048
# or even go with 4096-bit DH pool:
#     $ openssl dhparam -out /usr/local/etc/ssl/dhparam4096.pem 4096
# NOTE: This may take up to tens of minutes ...
#ssl_dhparam  /usr/local/etc/ssl/dhparam2048.pem;
ssl_dhparam  /usr/local/etc/ssl/dhparam4096.pem;

# Only use the latest TLS protocols
# TLSv1.3 requires nginx >= 1.13
#ssl_protocols              TLSv1.2 TLSv1.3;
ssl_protocols              TLSv1.2;
ssl_prefer_server_ciphers  on;
# Credit: https://mozilla.github.io/server-side-tls/ssl-config-generator/
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';

ssl_session_timeout        1d;
ssl_session_cache          shared:SSL:50m;
# Credit: https://github.com/mozilla/server-side-tls/issues/135
ssl_session_tickets        off;

# The Online Certificate Status Protocol (OCSP) was created to speed up
# the process that operating systems and browsers use to check for
# certificate revocation.
# Allow the server to send its cached OCSP record to the client during
# the TLS handshake, bypassing the OCSP responder and saving a roundtrip
# between the client and the OCSP responder.
#
# NOTE: If the "ssl_certificate" file does NOT contain intermediate
#       certificates, the certificate of the server certificate issuer
#       should be present in the "ssl_trusted_certificate" file.
#
ssl_stapling               on;
ssl_stapling_verify        on;