[Freeipa-users] AD sync via polling?

[Dmitri Pal]

On 02/25/2015 07:44 AM, Janne Blomqvist wrote:
> Hi,
>
> is it possible to use winsync to sync stuff from AD without having to 
> create domain trusts, or install some kind of sync services on the AD 
> DC's?
>
> For some background, we want to fetch user/group info and authenticate 
> against AD (managed by another department), but we also have a need to 
> have some own users/groups on top of the AD ones. So the initial plan 
> would be something like
>
> A1. We join a machine to the AD domain, so we can fetch information 
> from AD via getent or ldapsearch.
>
> A2. Scripts are written to fetch data from AD on the machine in (1) 
> above, merge and push this user/group data into freeIPA. These scripts 
> run periodically via cron.
>
> Clients are configured roughly per the following:
>
> B1. sssd on clients is configured to fetch user/group data from freeIPA.
>
> B2. pam_krb5 in client machines is configured to authenticate against AD.
>
> B3. pam_ldap (or pam_sss, if its use of kerberos doesn't conflict with 
> the configuration for connecting to AD used by pam_krb5?) in client 
> machines is configured to authenticate against freeIPA, for those 
> users who don't have accounts in AD.
>
> Yes, I can see this being a lot simpler if we could get a cross domain 
> trust going on between AD and our freeIPA servers or even just the 
> winsync services running on the DC's, but organizational politics 
> being what they are, this isn't happening. :(
>
> So my questions are
>
> - Can the freeIPA winsync tool bend to providing A2 above, or do we 
> have to do it ourselves?
>
> - As this setups is weird and non-standard, will using freeIPA 
> actually help us here, or would life be easier by just using 389 or 
> openldap directly? In essence, our main usage of freeIPA would be to 
> provide management tools for those users/groups which are not synced 
> from AD.
>
> - With the constraints above that we have to live with, is there a 
> better way to accomplish this?
>
> - Does the thing in B3 work? I.e. can I have pam_krb5 with config in 
> /etc/krb5.conf for connecting to AD, then pam_sss with sssd.conf using 
> the ipa or krb5 auth provider pointing to our freeIPA server(s).
>
>
> Thanks,
You can use SSSD and define two domains one for AD and one for IPA. You 
join machine to IPA to at least take advantage of what it provides for 
objects you manage but use AD as a second domain in SSSD configuration.
You do not need to sync anything or use pam_krb5/pam_ldap. So no scripts.
You can also decide to join the machine into AD instead but I do not see 
any benefits from doing it.
The only price in this setup is that one of the domains (the second one) 
would have to use fully qualified user names to log into the system.

HTH


-- 
Thank you,
Dmitri Pal

Sr. Engineering Manager IdM portfolio
Red Hat, Inc.