Re: Listing restrictions on roles.

[Daniel J Walsh <dwalsh@redhat.com>]

On 07/02/2014 01:07 AM, dE wrote:
> There seem to exist additional non-transition restrictions on roles
> which define when will a process be able to execute as a certain role.
>
> For e.g. a process which runs from a login shell cannot have system_r
> role. How do I list such rules?
>
> Looking at role transition rules, a transition to system_r should be
> allowed --
>
> sesearch --role_allow | grep system_r\;
> ...
> allow unconfined_r system_r;
> ...
>
> And the sudo process runs as unconfined_r --
>
> ps auxZ | grep sudo
> system_u:unconfined_r:unconfined_t:s0 root 669  0.0  0.4 206860 3356
> pts/1    S+   10:28   0:00 sudo -r unconfined_r nano
>
> But sudo -r system_r nano fails.
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The type has to be available to the role.  In the case of sudo -r
system_r nano, if the type to be run is unconfined_t, then SELinux would
end up with a label like

sytem_u:system_r:unconfined_t:s0

But I don't believe unconfined_t can run in the system_r role.

seinfo -rsystem_r -x | grep unconfined_t

To make your sudo command run, you would also need to select the type.

sudo -r sysadm_r -t nano_t nano ...

Or something like that where nano_t is available to the system_r role.