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this post was submitted on 23 Jan 2024
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If you want a local CA for just a few low assurance certificates (say for a test stack), the CA.pl script in the openssl distro is simple and sort of usable. If you want to be more serious you sort of have to know what you are doing. If you just want people's browsers to accept your subdomains, use a wildcard certificate (*.whatever.com). LetsEncrypt issues those and Cloudflare also might.
NO. JUST NO. Fucks sake that thing is written in Perl. Instead use https://github.com/FiloSottile/mkcert OR https://github.com/smallstep/certificates
But yes, a wildcard is mostly way to go, less risks and more results.
You can also use certbot on the subdomain servers if they are on the Internet, to auto-renew individual subdomain certificates. To run a "real" CA you need a lot of opsec and infrastructure regardless of what software you use. For basic dev-level purposes, CA.pl works and has been around forever, though I'm sure there is better stuff out there.
Re perl, see also: https://xkcd.com/224/ :)
Yes, I agree with you and I always tell everyone to stay away from creating a CA. - it's just not worth it the workload and the risks. Either way certbot can be even used without exposing local servers to the internet with DNS challenges and other means of authentication. The wildcard has the advantage of not having to publish those subdomains publicly in some for (DNS) or another (crt.sh).
https://github.com/FiloSottile/mkcert is the way to go for that.