On Tue, 2013-04-30 at 16:02 -0500, Robert Nichols wrote:
> 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 };
>
Looks like you are missing an actual domain transition rule. There is
also something fishy going on with role based access control.
Try this:
sudo semodule -r procmail_uncon
cat > mytest.te <<EOF
policy_module(mytest, 1.0.0)
optional_policy(`
gen_require(`
type procmail_t, unconfined_t, unconfined_exec_t;
')
domtrans_pattern(procmail_t, unconfined_exec_t, unconfined_t)
')
EOF
make -f /usr/share/selinux/devel/Makefile mytest.pp
sudo semodule -i mytest.pp
Then try again, but keep a look out for any "SELINUX_ERR" messages in
audit.log
There may be some RBAC related issues yet to resolve.
First things first: see where this gets you
> 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?
>
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