[Freeipa-users] Username attribute in trusted domain

[Jakub Hrozek]

On Mon, Apr 18, 2016 at 01:47:04PM +0000, Brook, Andy [CRI] wrote:
> 
> On 4/18/16, 5:03 AM, "freeipa-users-bounces at redhat.com on behalf of Jakub Hrozek" <freeipa-users-bounces at redhat.com on behalf of jhrozek at redhat.com> wrote:
> 
> >On Fri, Apr 15, 2016 at 08:01:06PM +0000, Brook, Andy [CRI] wrote:
> >> We’re trying to setup FreeIPA to be a good provider of UIDs and GIDs for our mostly RHEL systems. Overall, that works great. The issue I’m running into is that we need to have the same consistent UIDs and GIDs for our Isilon system which serves up both CIFS and NFS. Each user of the Isilon needs to have a UID so that the files are owned properly. The Isilon has a way of getting information from both Active Directory and an associated LDAP server. It gets its list of users and groups from AD, a list of users, UIDs, groups and GIDs from LDAP, and combine accounts that are the same. i.e. ADTEST.LOCAL\abrook and abrook from LDAP will the same user. However, FreeIPA will show abrook(as it sees through the Trust relationship with ADTEST.LOCAL) as abrook at adtest.local<mailto:abrook at adtest.local> instead of abrook, so the Isilon will see them as distinct accounts and won’t merge the information in them. I can’t, as far as I can tell right now, tell the Isilon to see users with @adtest.local as the same user without the domain. I can tell the Isilon to look at a different LDAP attribute as its username, but there is no attribute that has only the username.
> >> 
> >> I noticed in the documentation that if I were to do a sync with Active Directory (which isn’t something I want to do), I would get the ntDomainUserID attribute that is the same as the samAccountName. This doesn’t happen with a trust. Is there a way to get that in place with a custom attribute or pull more LDAP attributes from AD?
> >> 
> >> Has anyone else run into a situation like this? If so, were you able to rectify that? If so, how?
> >> 
> >> We have a ticket open with EMC for the Isilon as well, but want to make sure we’re coming at this from all the angles we can.
> >
> >I'm sorry, but currently overriding the attribute names for AD trusted
> >domains is not possible. We are working to make it possible for the next
> >version, but it's a bit of a stretch goal already, so chances it won't
> >be ready only for the version after the next one.
> >
> >What might perhaps help you is that starting with upstream SSSD 1.14
> >(upstream 7.3), it should be possible to configure SSSD to only print
> >the shortname and not qualify the users in trusted domains.
> >
> 
> Thank you. In your suggestion, are you talking about SSSD on the IPA
> Servers? My understanding of how SSSD on the IPA servers interacts with
> the servers that talk to them is pretty limited. If I upgrade SSSD on
> these servers, I might be able to get LDAP to not print the qualifying
> domain during ldapsearch?

Depends on how you want to query the information, whether with "getent
passwd $user" or ldapsearch. SSSD itself doesn't provide any data to
ldapsearch, but provides NSS, PAM and D-Bus interfaces.

And you'd have to upgrade SSSD on both clients and servers.

> 
> I’m not really asking about overriding attribute names, but rather
> adding a new attribute that only has the shortname. Is there a way to
> do that may through a custom NIS mapping or something like that? Maybe
> a dynamic schema extension? I’ve tried reading through extending the
> schema, but am currently confused as to how to go about it.

It sounds like the new attribute would be added on the AD side, but at
the moment, SSSD's attribute map for the trusted domains is hardcoded.

The only way would be to query the attribute through our d-bus API.