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sosreport / sos

A unified tool for collecting system logs and other debug information
http://sos.rtfd.org
GNU General Public License v2.0
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How to Handle SELinux Denials on Default Temp Dir #3372

Open eggfoobar opened 1 year ago

eggfoobar commented 1 year ago

Hey folks, when using the microshift plugin, we see some SELinux denials when we use the default folder of /var/tmp, changing the temp dir with --tmp-dir to something like /tmp solves the issue, but I was wondering if we should be shipping a solution to this with our plugin for the default behavior?

type=AVC msg=audit(1696227229.107:8490): avc:  denied  { write } for  pid=22413 comm="ovs-appctl" path="/var/tmp/sos.oq1u66ua/sosreport-dhcp-1-235-95-2023-10-02-bnfjcyw/sos_commands/microshift_ovn/ovs-appctl_-t_.var.run.ovn.ovnnb_db.ctl_coverage.show" dev="dm-0" ino=1804675 scontext=system_u:system_r:openvswitch_t:s0 tcontext=system_u:object_r:tmp_t:s0 tclass=file permissive=0
TurboTurtle commented 1 year ago

Well we definitely don't want to have any plugins generating AVC denials out of the box. The curious thing to me is why we're only seeing this here. We make many calls to ovs-appctl in other plugins (openvswitch, ovn_central, openshift_ovn), and so far we've not had a report of this.

What's the environment this is being run in? Does the openvswitch plugin also get enabled in a microshift environment, and if so are there any other denials being seen with that plugin?

pmoravec commented 1 year ago

Why execution of

ovs-appctl -t /var/run/ovn/ovnnb_db.ctl coverage/show

command can't write to /var/tmp, where SELinux should allow (almost?) anything? That sounds strange to me..

eggfoobar commented 1 year ago

Yeah agreed, I'm currently getting access to the system this is happening in. As you've stated this shouldn't be happening since there's allow rules for this action already in place.