pam_group vs. multiple group lines

Richard Foulkes rbsfou at yahoo.co.uk
Tue Aug 21 14:29:25 PDT 2007


Ok, so how are you supposed to control membership of the wheel group  
via ldap? Ok, you COULD remove the local wheel entry in /etc/group,  
but this would probably be a bad idea if the ldap server were  
unavailable.

I've had a similar problem to this where group names are duplicated  
across different operating systems (i use gentoo, freebsd and ubuntu  
on my network) but the gid's are different. For instance the 'audio'  
group on gentoo has a different gid to the 'audio' group on ubuntu.  
This would appear to have something to do with nss_base_group  
configuration option in the ldap.conf file used by nss_ldap and  
pam_ldap - something to do with the "search scope" - whereby i can  
configure the ldap.conf file for one os to look a sub-tree of my  
"groups" ou for additional groups specific to that OS - but  
documentation on the PADL site on this topic is almost non-existant!

Can anyone help?


On 21 Aug 2007, at 21:24, Chuck Swiger wrote:

> On Aug 21, 2007, at 12:50 PM, Ulrich Spoerlein wrote:
>> I found this while trying to migrate groups into LDAP, but you don't
>> need LDAP to reproduce this, simply place the following in /etc/group
>>
>> wheel:*:0:root
>> wheel:*:0:us
>
> That's a misconfiguration.  From "man 5 group":
>
>   The group field is the group name used for granting file access  
> to users
>   who are members of the group.  The gid field is the number  
> associated
>   with the group name.  They should both be unique across the  
> system (and
>                              ^^^^^^^^^^^^^^^^^^^^^
>   often across a group of systems) since they control file access.
>
> -- 
> -Chuck
>
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