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How to properly setup local certificate authorities for sub domains? (lemmy.world)

submitted 10 months ago by [email protected] to c/[email protected]

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Hello everyone,

A bit of background on how things are configured: I have many local services and am in the process of setting up two local domains, namely local1.publick.com and local2.publick.com. I own the domain name publick.com and manage it through Cloudflare.

Local1 is for the Windows domain and is using Active Directory, while local2 is for the Linux domain and is using RHEL IDM.

Now, as I am also exploring Single Sign-On (SSO) with Keycloak and a few other things, I would like to properly set up SSL for all these subdomains. Can I configure two local certificate authorities? One for local1.public.com and another for local2.publick.com? I would then use these to create certificates for service.local1.publick.com and service.local2.publick.com. Since the AD domain controller and RHEL IDM controller are authoritative for these two domains, can I still integrate two CAs with this setup?

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[–] [email protected] 3 points 10 months ago* (last edited 10 months ago)

Years (decades) ago it wasn't uncommon to create self-signed/local CAs for active directory, but it's really uncommon today since everything is internet facing and we have things like Let's Encrypt.

It's so old, the "What's New" article from Microsoft references Windows Server 2012 which is around when I stopped working on Windows Server. I kinda remember it, and you needing to add the server's cert to your trusted roots. (I don't know about Linux, but the concept is the same, I'm sure. I never tried generating certificates, but know all the other client -side stuff. Basically you need a way to fulfill CSRs.)

https://learn.microsoft.com/en-us/windows-server/identity/ad-cs/

What you'd want to do it in Windows is all there, and Microsoft made that pretty easy back then to integrate with all their platforms and services, but I'd caution, do you really want to implement 10+ year old tech?