Oliver Kiddle via FreeIPA-devel wrote:
> Using FreeIPA on RHEL 9, I have sudo rules and an HBAC rule. The HBAC
> rules are there to disable all access to certain accounts on some
> machines. Testing with:
>     ipa hbactest --service=sudo-i --user=user --host=host
> I get the expected "Access granted: False" response - regardless of the
> choice of service or whether I use a short or fully-qualified hostname.
> Using ssh to connect to the host is blocked, as are attempts to log in
> with gnome, vnc etc - again matching my expectations. However, when
> sudo -u user -i is used on the host this just works regardless. There
> are sudo rules permitting the initial users (which aren't just root) to
> switch to the target user but I would have expected the HBAC rule to
> apply and the login to be blocked.
> 
> ipa hbacsvc-find does list services like sudo and sudo-i which would
> imply that sudo is supposed to support HBAC rules. At what stage is
> this supposed to be enforced? I would assume that pam_sss.so should be
> responsible for this. The pam configuration I have is unchanged from
> RHEL 9.4 defaults and does include pam_sss.so for all of auth, account,
> password and session. Do I need to change the configuration somewhere
> for HBAC rules to apply to the sudo-i service? Or am I misunderstanding
> something?
> 
> I'm aware that I could specify host restrictions in the sudo rule but
> there are many of them and they apply to a mix of blocked and allowed
> accounts so this is not trivial. And it would be duplicating what is
> already in the HBAC rule to block ssh, gdm, etc.

You'll want to start here
https://docs.pagure.org/sssd.sssd/users/sudo_troubleshooting.html

The SSSD team will need logs showing what is going on.

rob

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