Create a FIPS-enabled NGINX with Ubuntu 20.04

Warning
You must be using an Ubuntu Pro or UA-enabled host in FIPS mode.
Let's get started quickly with an Ubuntu Pro FIPS EC2 instance on AWS.

cp ua-attach-config.yaml.template ua-attach-config.yaml

Retrieve a UA token from ubuntu.com/advantage (free for personal use).

Edit the ua-attach-config.yaml file to add the obtained token to the token field.

Build the FIPS-enabled Ubuntu-based NGINX container image:

DOCKER_BUILDKIT=1 docker build . --secret id=ua-attach-config,src=ua-attach-config.yaml -t nginx-fips:1.18

We can now test it works as expected:

> docker run -d --name nginx-fips nginx-fips:1.18
> docker exec -it nginx-fips dpkg-query --show openssl
> docker exec -it nginx-fips bash
# MD5 is disabled in FIPS mode, and the following command will fail
root@9aa1de924c3f:/# (echo "GET /" ; sleep 1) | openssl s_client -connect 127.0.0.1:443 -cipher RC4-MD5
# AES256-SHA is a permitted cipher in FIPS mode, it works!
root@9aa1de924c3f:/# (echo "GET /" ; sleep 1) | openssl s_client -connect 127.0.0.1:443 -cipher AES256-SHA

The end!

---

Inspired by https://github.com/canonical/ubuntu-advantage-client/blob/main/docs/tutorials/create_a_fips_docker_image.md