Re: Bug in the semanage user management code or genhomedircon?

On Fri, 2006-03-17 at 08:11 +0100, Thomas Bleher wrote:
> * Ivan Gyurdiev <ivg2@cornell.edu> [2006-03-16 23:53]:
> >
> > >What am I doing wrong?
> > >
> > Can you let me know what you see with the following policycoreutils
> > patch, when you try the same thing (do semanage user -l, should show the
> > labeling prefix for each user).
>
> OK, this seems to show the problem:
> # semanage user -l
>
> Labeling MLS/ MLS/
> SELinux User Prefix MCS Level MCS Range SELinux Roles
>
> root user s0 s0-s0:c0.c255 system_r sysadm_r staff_r
> staff_u user s0 s0-s0:c0.c255 sysadm_r staff_r
> sysadm_u user s0 s0-s0:c0.c255 sysadm_r
> system_u user s0 s0-s0:c0.c255 system_r
> user_u user s0 s0 user_r
>
> Where is the labeling prefix set? Or better, where can I change it?

It is supplied by an auxiliary file, users_extra, that is now an optional part of the policy module package format, to provide an explicit mapping from SELinux users to labeling prefixes. The original genhomedircon was (improperly) making assumptions about the significance of the ordering of roles in the policy/users file (as that ordering had no inherent meaning to SELinux and was lost upon policy compilation) and naturally also required access to that source file, whereas it now uses libsemanage to access an explicit mapping file supplied with the policy.

# cat /etc/selinux/mls/modules/active/users_extra user user_u prefix user;
user staff_u prefix staff;
user sysadm_u prefix sysadm;
user root prefix sysadm;

-- 
Stephen Smalley
National Security Agency


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