On Wed, 2016-08-24 at 11:02 +0200, Sumit Bose wrote:
> On Wed, Aug 24, 2016 at 09:52:17AM +0200, Jakub Hrozek wrote:
> > 
> > On Wed, Aug 24, 2016 at 07:39:54AM +0000, Joakim Tjernlund wrote:
> > > 
> > > On Wed, 2016-08-24 at 09:14 +0200, Petr Spacek wrote:
> > > > 
> > > > On 24.8.2016 09:03, Joakim Tjernlund wrote:
> > > > > 
> > > > > 
> > > > > Getting to the of our AD domain migration but there is one step I 
> > > > > haven't solved.
> > > > > Our users has UID/GID in the new domain while the already present 
> > > > > users in the new domain
> > > > > does not. Assigning UID/GID to all users does not sit well with 
> > > > > upstream IT so I am 
> > > > > looking at what to do with these when they visit/access our site.
> > > > > 
> > > > > What comes to mind is partial id_mapping, if a user had UID/GID in 
> > > > > the AD use that, otherwise
> > > > > do id_mapping for that user(preferably the same way samba does it 
> > > > > since we already have a samba
> > > > > based interim solution).
> > > > > 
> > > > > I haven't found a way to do that in sssd, is there?
> > > > > Maybe I am just full of it and this is really a bad idea?
> > > > 
> > > > Are you using FreeIPA? FreeIPA got support for "ID Views" which can be 
> > > > used
> > > > for this purpose. (I'm not very sure about pure-SSSD case.)
> 
> It is also possible in the pure-SSSD case, see man sss_override for
> details.
> 
> > 
> > > 
> > > 
> > > I wish, but this is a Windows AD :(
> > 
> > Petr had IPA-AD trusts in mind, I guess.
> > 
> > Partial ID mapping is not possible, sorry.
> 
> yes, SSSD cannot do this automatically because we can never be sure that
> a UID/GID attribute will be added in future to a user who currently
> does not have them set.

I see, but does not sssd refresh/check cached values against AD regularly?
Or mark the non UID/GID user as do not cache? 

> 
> But sss_override might help you. Depending on whether new users created
> in AD will have UID/GID set or not you can create overrides for the
> existing users with or without them and then use ldap_id_mapping 'true'
> or 'false' respectively.
> 
> Since this is not a centrally managed solution you have to do this on
> every host running SSSD and you have to load the overrides again each
> time you remove the cache, see user-import and user-export in man
> sss_override for details. Depending on the number of clients it might
> make sense to introduce FreeIPA to have a centrally manages solution for
> this.

Ouch, this is not really manageable.

  Jocke
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