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mailinabox/conf/nginx-ssl.conf
Donald Brown f92d1e48ec
Update for better PCI compliance
We should disable TLSv1 completely for PCI compliance. Also, update list of accepted ciphers to be more compliant with PCI and HIPAA/NIST.
2018-08-20 14:43:02 -06:00

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# from https://gist.github.com/konklone/6532544 and https://mozilla.github.io/server-side-tls/ssl-config-generator/
###################################################################################################################
# Basically the nginx configuration I use at konklone.com.
# I check it using https://www.ssllabs.com/ssltest/analyze.html?d=konklone.com
#
# To provide feedback, please tweet at @konklone or email eric@konklone.com.
# Comments on gists don't notify the author.
#
# Thanks to WubTheCaptain (https://wubthecaptain.eu) for his help and ciphersuites.
# Thanks to Ilya Grigorik (https://www.igvita.com) for constant inspiration.
# Path to certificate and private key.
# The .crt may omit the root CA cert, if it's a standard CA that ships with clients.
#ssl_certificate /path/to/unified.crt;
#ssl_certificate_key /path/to/my-private-decrypted.key;
# Tell browsers to require SSL (warning: difficult to change your mind)
# Handled by the management daemon because we can toggle this version or a
# preload version.
#add_header Strict-Transport-Security max-age=31536000;
# Prefer certain ciphersuites, to enforce Forward Secrecy and avoid known vulnerabilities.
#
# Forces forward secrecy in all browsers and clients that can use TLS,
# but with a small exception (DES-CBC3-SHA) for IE8/XP users.
#
# Reference client: https://www.ssllabs.com/ssltest/analyze.html
ssl_prefer_server_ciphers on;
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';
# Cut out (the old, broken) SSLv3 entirely.
# This **excludes IE6 users** and (apparently) Yandexbot.
# Just comment out if you need to support IE6, bless your soul.
ssl_protocols TLSv1.2 TLSv1.1;
# Turn on session resumption, using a cache shared across nginx processes,
# as recommended by http://nginx.org/en/docs/http/configuring_https_servers.html
ssl_session_cache shared:SSL:50m;
ssl_session_timeout 1d;
#keepalive_timeout 70; # in Ubuntu 14.04/nginx 1.4.6 the default is 65, so plenty good
# Buffer size of 1400 bytes fits in one MTU.
# nginx 1.5.9+ ONLY
#ssl_buffer_size 1400;
# SPDY header compression (0 for none, 9 for slow/heavy compression). Preferred is 6.
#
# BUT: header compression is flawed and vulnerable in SPDY versions 1 - 3.
# Disable with 0, until using a version of nginx with SPDY 4.
spdy_headers_comp 0;
# Now let's really get fancy, and pre-generate a 2048 bit random parameter
# for DH elliptic curves. If not created and specified, default is only 1024 bits.
#
# Generated by OpenSSL with the following command:
# openssl dhparam -outform pem -out dhparam2048.pem 2048
#
# Note: raising the bits to 2048 excludes Java 6 clients. Comment out if a problem.
ssl_dhparam STORAGE_ROOT/ssl/dh2048.pem;
# OCSP stapling - means nginx will poll the CA for signed OCSP responses,
# and send them to clients so clients don't make their own OCSP calls.
# http://en.wikipedia.org/wiki/OCSP_stapling
#
# while the ssl_certificate above may omit the root cert if the CA is trusted,
# ssl_trusted_certificate below must point to a chain of **all** certs
# in the trust path - (your cert, intermediary certs, root cert)
#
# 8.8.8.8 and 8.8.4.4 below are Google's public IPv4 DNS servers.
# nginx will use them to talk to the CA.
ssl_stapling on;
ssl_stapling_verify on;
resolver 127.0.0.1 valid=86400;
resolver_timeout 10;