How to combine kolab and posix groups

Gunnar Wrobel wrobel at
Fri Apr 23 21:27:01 CEST 2010

Quoting Alexander Gran <alexg at>:

> Am Donnerstag 22 April 2010 17:53:36 schrieb Gunnar Wrobel:
>> Look at the core feature of a group: A group combines a number of
>> members. If you look at the posixGroup you see that its member
>> attribute is "memberUid" which identifies a user by the uid he has on
>> a system. The kolabGroupOfNames however derives from groupOfNames and
>> that uses the "member" attribute which is a DN within the LDAP tree.
>> This is something completely different than the uid for the posixGroup.
>> I do not deny that there may be a mapping. But that mapping cannot be
>> defined by simply merging the two object types. I'm interested to read
>> about how Christian solved this problem.
> Well, I see a difference between kolab and Posix Groups: posix groups contain
> only PosixAccounts (if you ignore the possibility that other classes could
> have a uid attribute as well), whereas kolabGroups can contain  
> anything in the
> ldap, including e.g. other groups.
> BUT:
> As far as I can see, kolab goups contain just user accounts, and these are -
> at least for me - posixAccounts. When I try to add a group to a group I
> thereofre get:
> Errors:
> No user with email address, UID or alias customersmachsim at
> Therefore I don't (yet?) see the need for the difference?

As I said: I do not deny that there may be a mapping. In your case there is.

But both object classes were designed so that you *can* use them for  
something different. The way LDAP and object classes work there is no  
way around the current situation. Both definitions are incompatible.

Nobody stops you from either extending the kolabGroupOfNames with a  
"uid" attribute and adapt your system to accept this as "posixGroup"  
or to recode the affected Kolab server components so that they work  
with posixGroups. Both is probably hard.

But as mentioned before: It is not possible to combine the two groups  
as the people that originally created these object classes had  
different intentions for them.



> regards
> Alex
> --
> Dipl. Inform. Alexander Gran, MBA
> alexg at
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