On Sat, Jul 18, 2020 at 12:45:03AM +0000, Vinícius Ferrão via
FreeIPA-users wrote:
> Hello,
> 
> I need to issue some certificates for the AD Environment and I
> don’t have ADCS in place. So my FreeIPA deployment was with a self
> signed CA and the common AD Trust enabled.
> 
> Now with this issue I’m looking on the IPA’s documentation and
> there’s some recommendations to deploy IPA as as subCA from ADCS,
> but as as I said, I don’t have it. So I was thinking if it’s
> possible to issue certificates for Windows machines directly form
> FreeIPA, and if this is recommended or not.
> 
> If it’s possible but it will be a hassle, there’s a way to make
> FreeIPA talk with ADCS after the deployment? I can setup an ADCS
> instance to keep Windows certificates in a separate location.
> 
> I saw this post:
> https://frasertweedale.github.io/blog-redhat/posts/2019-09-23-direct-integration-ipa-certs.html
> but I don’t think it’s the same issue here; the valuable info that
> I found on this site is about trusting the FreeIPA CA certificate
> on Windows environment: "Operationally there is one additional
> step when the IPA CA is not subordinate to the AD CA: the IPA CA
> certificate has to be explicitly trusted.”; but the use case does
> not seems to be on a Windows system.
> 
> Thanks for any guidance.
>
Hi Vinícius,

FreeIPA does not support the enrolment protocols used by Windows
systems.  You might ahve an easier time using AD-CS.  If you decide
to use AD-CS you have three options on how to relate the PKIs:

a) Have AD-CS as a separate PKI.  You will need to add the AD-CS CA
   cert to IPA's trust store and vice-versa.

b) Re-chain the IPA CA to become a subordinate of the AD-CS CA.

c) Make AD-CS a subordinate of the IPA CA.  See [1] for how to issue
   subordinate CA certs from FreeIPA.

[1] 
https://frasertweedale.github.io/blog-redhat/posts/2018-08-21-ipa-subordinate-ca.html

If you decide to continue without AD-CS, we can help with issuance
(the profile configuration, CA ACLs, etc) but I have no idea about
the procedure on the Windows side (creating the CSR, installing the
certificate, etc).

Cheers,
Fraser
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