On 05/01/2013 05:01 AM, Dominick Grift wrote:
On Tue, 2013-04-30 at 16:02 -0500, Robert Nichols wrote:
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
I _finally_ discovered that makefile last night (a web page that I think
was in Portugese was the first place I found that referenced it), and
that let me use Dan's blog page as a model. I did get it to work, but I
had to use a custom type my_uncon_exec_t:
policy_module(procmail_uncon, 1.0.18)
gen_require(`
type unconfined_t;
type unconfined_exec_t;
type procmail_t;
role system_r;
')
type my_uncon_exec_t;
files_type(my_uncon_exec_t)
allow procmail_t unconfined_t : process { transition sigchld };
domain_auto_trans(procmail_t, my_uncon_exec_t, unconfined_t)
role system_r types unconfined_t;
If I try to do that with unconfined_exec_t in the domain_auto_trans(),
I get these AVCs:
type=AVC msg=audit(1367415022.653:1349): avc: denied { transition } for
pid=11841 comm="procmail" path="/home/rnichols/bin/stock-alert" dev=sda6
ino=229247 scontext=system_u:system_r:procmail_t:s0
tcontext=system_u:unconfined_r:unconfined_t:s0 tclass=process
type=SYSCALL msg=audit(1367415022.653:1349): arch=c000003e syscall=59 success=no
exit=-13 a0=7fffee5d82dc a1=bbf100 a2=bc00d0 a3=8 items=0 ppid=1 pid=11841
auid=4294967295 uid=500 gid=500 euid=500 suid=500 fsuid=500 egid=500 sgid=12
fsgid=500 tty=(none) ses=4294967295 comm="procmail" exe="/usr/bin/procmail"
subj=system_u:system_r:procmail_t:s0 key=(null)
Running those through audit2allow yields:
#============= procmail_t ==============
#!!!! This avc is a constraint violation. You will need to add an attribute to
either the source or target type to make it work.
#Contraint rule:
allow procmail_t unconfined_t:process transition;
No way in Hell am I ever going through this again. The next time SELinux
gives me any trouble, it gets shut off and that's the end of it.
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
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