I need a script invoked from procmail_t to run unconfined.

[Robert Nichols]

On 04/30/2013 12:39 PM, Robert Nichols wrote:
> I have a script invoked from a procmail recipe that needs to perform
> actions involving searching for processes by name, playing sound through
> pulseaudio, sending mail, plus a few others. When I run with enforcing=0
> I get 385 AVC denials (103KB, not attached), and that's _without_
> disabling the "dontaudit" rules, which would yield over 100 more
> denials.  The target contexts are not something I can change without
> totally destroying the current policy.
>
> Any suggestions other than the 120 "allow" rules that audit2allow would
> suggest (and that's without considering the "dontaudit" denials)?
>
> I'm getting _really_ tired of this.  I'm spending more time trying to
> get things to work under SELinux than it would take me to recover from a
> (highly unlikely) intrusion.  Sometimes the cost of insurance is just
> too high.

I tried setting up a domain transition, but it looks like a transition from
procmail_t to unconfined_t just isn't going to be allowed.  Since
unconfined_t already has an entrypoint unconfined_exec_t, the module I
installed is:

     module procmail_uncon 1.0;

     require {
	type unconfined_t;
	type unconfined_exec_t;
	type procmail_t;
	class process { transition sigchld };
     }

     allow procmail_t unconfined_t : process { transition sigchld };

That built and installed OK, and I gave the script the label
unconfined_u:object_r:unconfined_exec_t:s0, but when procmail tries to
execute it I get the error:

     type=SELINUX_ERR msg=audit(1367353892.747:26477): security_compute_sid: 
invalid context system_u:unconfined_r:procmail_t:s0 for 
scontext=system_u:system_r:procmail_t:s0 
tcontext=unconfined_u:object_r:unconfined_exec_t:s0 tclass=process

and the desired transition does not occur.

Did I do something wrong there, or is disabling SELinux my only recourse?

-- 
Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.