cron issues with bash source (UNCLASSIFIED)
Classification: UNCLASSIFIED
Caveats: NONE
Background info: running RHEL6 with the latest updates, so
selinux-policy-targeted-3.7.19-231.el6_5.3.noarch.
When moving from Permissive to Enforcing, two scripts in /etc/cron.daily that use the bash
"." operator to include a functions file can no longer do so. The functions
file sets $PATH and other environment variables, so subsequent commands in the scripts
fail.
Interestingly, when run out of root's crontab, the scripts work just fine. The
context when doing that (gathered by placing id -Z in the script) is:
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
Not sure why; the script itself isn't unlabeled:
bash-4.1# ls -lZ /usr/local/sbin/puppet-state
-rwx------. root root system_u:object_r:bin_t:s0 /usr/local/sbin/puppet-state
When run from /etc/cron.daily (or cron.hourly, where I placed a copy for faster testing),
the context is:
system_u:system_r:system_cronjob_t:s0-s0:c0.c1023
bash-4.1# ls -lZ /etc/cron.hourly/puppet-state
-rwx------. root root system_u:object_r:bin_t:s0 /etc/cron.hourly/puppet-state
The exact command in question it's failing to run is:
. /opt/puppet/scripts/functions
Which is labeled thusly:
bash-4.1# ls -lZ /opt/puppet/scripts/functions
-r-x------. root root unconfined_u:object_r:usr_t:s0 /opt/puppet/scripts/functions
In either Enforcing or Permissive, I wasn't seeing anything that looked relevant, so I
ran semodule -DB. This is the only thing cron-related, but (and I'm not very
experienced with SELinux, so maybe I'm missing something) that doesn't seem like
it:
bash-4.1# cat /var/log/audit/audit.log-20140814 | grep cron | audit2allow -w
type=AVC msg=audit(1407915503.212:155119): avc: denied { rlimitinh } for pid=26239
comm="prelink" scontext=system_u:system_r:prelink_cron_system_t:s0-s0:c0.c1023
tcontext=system_u:system_r:prelink_t:s0-s0:c0.c1023 tclass=process
Was caused by:
Missing type enforcement (TE) allow rule.
You can use audit2allow to generate a loadable module to allow this
access.
type=AVC msg=audit(1407915503.212:155119): avc: denied { siginh } for pid=26239
comm="prelink" scontext=system_u:system_r:prelink_cron_system_t:s0-s0:c0.c1023
tcontext=system_u:system_r:prelink_t:s0-s0:c0.c1023 tclass=process
Was caused by:
Missing type enforcement (TE) allow rule.
You can use audit2allow to generate a loadable module to allow this
access.
I suppose we could run them out of root's crontab, but they're easier to manage in
cron.daily, and I'd like to solve the problem. Any assistance is greatly appreciated.
A search of the list archives didn't turn up this issue; sorry if I've missed
it.
--
Ray Shaw (Contractor, STG)
Army Research Laboratory
Classification: UNCLASSIFIED
Caveats: NONE