After the inital acme.sh script is downloaded and bootstrapped we
can remove it. If a host already has been bootstrapped then there
is no need to download it and do it over again.
Instead of manually creating our own self-signed certificate we can
use the one created automatically by the ssl-cert package on Debian.
This is only used by the dummy default HTTPS vhost.
This parameterizes the HTTP Strict Transport Security header so we
can use it consistently across all templates. Also, it updates the
max-age to be ~1 year in seconds, which is recommended by Google.
See: https://hstspreload.org/
The certbot-auto client that I've been using for a long time is now
only supported if you install it using snap. I don't use snap on my
systems so I decided to switch to the acme.sh client, which is imp-
lemented in POSIX shell with no dependencies. One bonus of this is
that I can start using ECC certificates.
This also configures the .well-known directory so we can use webroot
when installing and renewing certificates. I have yet to understand
how the renewal works with regards to webroot, though. I may have to
update the systemd timers to point to /var/lib/letsencrypt/.well-known.
It seems that it is no longer recommended/supported to install the
standalone certbot-auto client on Ubuntu 20.04. We apparently need
to use the one provided by Ubuntu, which luckily includes a service
and timer to renew the certs.
This config stopped working a few years ago probably when hosts started
getting IPv6 and we need to allow ::1. Make sure we're only listening
on local loopback interfaces also.
ansible-lint told me not to test equality with booleans using literal
"True" and "False", but it Ansible complains if I use "is True" also.
It seems that I need to adjust the syntax slightly.
We can register changes when adding repositories and keys and then
update the apt package index conditionally. This should make it be
more consistent between initial host setup and subsequent re-runs.
Avoids the following error in apt:
Skipping acquire of configured file 'nginx/binary-i386/Packages' as repository 'https://nginx.org/packages/ubuntu bionic InRelease' doesn't support architecture 'i386'
No need to give Google even more data or free advertising by using
this as the default! In practice I always use the DNS servers from
the VPS provider anyways.
