Re: SELinux role separation

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

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On 01/18/2011 01:03 PM, Qwyjibo Jones wrote:
> 
> I am currently working with an Itanium2 system which has RHEL 5.3 MLS
> installed.
> I am trying to understand how separation of roles works in SELinux/MLS
> policy version 21. We have been told that we need to separate roles that
> the sys admin is no longer allowed to do.
> 
> After reading through these threads, in the archives I am still
> wondering about a couple things:
> 
> http://www.nsa.gov/research/selinux/list-archive/0504/thread_body66.shtml#11082
> 
> And this one:
> http://www.nsa.gov/research/selinux/list-archive/0802/thread_body60.shtml
> 
> 1) Is the RHEL 5.x MLS policy version 21 capable of the following
> separation of sysadm_r and secadm_r roles:
> 
>    a) Can the secadm_r role be the only role that can assign roles via
> semanage?
> 
>    b) Can the secadm_r role be the only role that can assign/modify
> network interface labels via semanage?
> 
secadm_r:secadm_t in MLS policy is only allowed to run semanage if the
allow_sysadm_manage_security boolean is turned off.

>    c) Can the secadm_r role be the only role that can control files used
> in auditing, like auditd.conf. audit.rules, /etc/init.d/auditd etc...
> 
auditadm_r:auditadm_t is only allowed to modify these files.

> 2) Is this better accomplished with a combination of SUDO and SELinux?
Since sysadm_t can hack his way around the SELinux controls via tools
like rpm and fdisk, you are better off using sudo to further restrict
his actions, if possible.
> 3) How can I determine what secadm_r can do in the current
> configuration? can any of the CLI tools show me that? ( no gui tools
> available )
> 
You probably want to look at secadm_t

sesearch -A -t secadm_t

> If not, what about RHEL 6 ? ( I understand RHEL 6 is not available to
> Itanium systems, but we may have new hardware soon)
> 
> Any tips. hints, pointers etc... would be very helpfull.
> 
> Thanks for your time,

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