On Do, 06.12.18 16:34, Zbigniew Jędrzejewski-Szmek (zbys...@in.waw.pl) wrote:

> > I wonder if we should think of a tighter system integration and subsume
> > the tasks of nss_machines into SSSD.
> > It would allow for detection and logging of UID conflicts should they
> > happen in a live system with the ability, for the admin to better
> > choose which of the pools should have priority in case of conflict ...
>
> Integration with sssd could be useful, dunno. But nss modules only report
> existing usage of uids on the system. So by the time the nss modules are
> invoked, it's already too late, in the sense that two completely unrelated
> entities are sharing the user, possibly leading to unintended privilege
> augmentation or information leakage. Nss modules are not useful to "choose"
> anything.

Yes, I agree fully. Announcing allocated users with NSS is one thing,
it's something we always should do, unconditionally. It's only
reasonably way to announce you took possession of a range. Actually
allocating ranges is a different discussion. It's a discussion worth
having, but is unrelated from the NSS discussion I think.

Lennart

--
Lennart Poettering, Red Hat
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