Hacker News new | ask | show | jobs
by patrakov 20 days ago
My preferred procedure is to use DNS-01 validation and have no publicly accessible "A" or "AAAA" record for internal services.

Or even a more extreme example: https://crt.sh/?id=27555237869 (sorry for any possible crt.sh downtime) - the domain name in question never existed in public or private DNS by itself. It is used only for a WPA3-Enterprise network, as the CN that WiFi clients expect to be present in the RADIUS server certificate, but never resolve. In the public DNS, only the "_acme-challenge" TXT record exists.
1 comments
otabdeveloper4 19 days ago
Sounds bonkers. Why not make an overlay LAN and host your own DNS server in 10.0.0.0/8?
link
patrakov 19 days ago
I do have a DNS server in my LAN, with some records served to internal clients only. But the _acme-challenge record needs to be public for the DNS-01 validation to succeed.

The point was that you can obtain a certificate for a domain name without creating any records other than the _acme-challenge TXT record. I.e., that the domain might be completely empty all the time except for this record.

link