On Wed, Aug 24, 2016 at 01:59:14PM +0000, Joakim Tjernlund wrote:
> On Wed, 2016-08-24 at 15:19 +0200, Jakub Hrozek wrote:
> > On Wed, Aug 24, 2016 at 01:33:33PM +0200, Lukas Slebodnik wrote:
> > > 
> > > On (24/08/16 09:10), Joakim Tjernlund wrote:
> > > > 
> > > > 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? 
> > > > 
> > > I am not sure you understand it correctly.
> > > 
> > > sssd does not support partial ID mapping intentionally.
> > > 
> > > let's image. The partial ID mapping would be enabled but neither of
> > > uses have posix attibutes. So sssd would generate UID/GID from SID.
> > > 
> > > Then later someone decide to add UID and GID into Active Directory.
> > > But there is a chance that administrator would not be carefull
> > > and assign IDs which are already generated from SID for another user.
> > > If the another user had higer privileges then it would be a security 
> > > problem.
> > 
> > ...also files would had to be chown-ed, so at the very least there is a
> > huge annoyance to the admins and risk to locking out users away from
> > their files because you forget to chown some files..
> > 
> 
> OK, so no good way to fix this problem as it is now.
> But, so I am sure, if we were get a subdomain to INFINERA.COM say 
> SE.INFINERA.COM it would be
> possible to have UID/GID in SE.INFINERA.COM and idmapping in INFINERA.COM?
> What about group membership, can a SE.INFINERA.COM user be in a group in 
> INFINERA.COM and vice versa?

This is only possible if you define the domains separately in the config
file:

[domain/infinera.com]

[domain/se.infinera.com]

Because current sssd versions don't support different configurations for
the main domain and subdomain (and even if they did, I don't think
allowing different ID mappings for different subdomains would be a good
idea)
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