Enabling TLS1.3

TLS 1.3. Its new, its shiny, its much better.And its supported by nginx 1.13 which is part of the backend of this blog.

It was a bit of work to get a perfect score on ssllabs test (as below), and here’s how I did it.

First, the server supports a bunch of different ‘sites’ (each is a different host name, and thus a different SNI). I used Let’s Encrypt for the certificates. To make matters simple for config, I created a single include file with all the SSL parameters:

ssl_protocols TLSv1.3 TLSv1.2;

ssl_certificate /etc/letsencrypt/live/donbowman.ca/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/donbowman.ca/privkey.pem;
ssl_trusted_certificate /etc/letsencrypt/live/donbowman.ca/fullchain.pem;

ssl_dhparam /etc/ssl/certs/dhparam.pem;
ssl_ecdh_curve secp384r1;
ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH:!AES128';
ssl_prefer_server_ciphers on;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets on;
ssl_stapling on;
ssl_stapling_verify on;
resolver 8.8.8.8 8.8.4.4 valid=600s;
resolver_timeout 5s;
add_header Strict-Transport-Security "max-age=63073000; includeSubDomains; preload";
add_header X-Frame-Options SAMEORIGIN;
add_header X-Content-Type-Options nosniff;

I then included this in each file:

server {
    listen 0.0.0.0:443 ssl http2;
    server_name blog.donbowman.ca;

    include don-tls.conf;

 ...

like so.