Re: RHEL 7 shutdown_run interface
On 17/06/2016, 5:42 PM, "Miroslav Grepl" <mgrepl(a)redhat.com> wrote:
On 06/16/2016 02:04 PM, Douglas Brown wrote:
> On 16/06/2016, 6:15 PM, "Miroslav Grepl" <mgrepl(a)redhat.com> wrote:
>
>
>> On 06/14/2016 02:52 AM, Douglas Brown wrote:
>>> Hi all,
>>>
>>> In the process of porting policies from RHEL 6 to 7, I’m having an issue
>>> with the shutdown_run interface.
>>>
>>> The trivial te file below compiles and loads fine on RHEL 6.7:
>>>
>>> policy_module(test, 0.1)
>>>
>>> require {
>>> role staff_r;
>>> type staff_t;
>>> }
>>>
>>> shutdown_run(staff_t, staff_r)
>>>
>>> However, there appears to be a bug in RHEL 7.2, because loading with
>>> semodule gives the error: "libsepol.print_missing_requirements:
test's
>>> global requirements were not met: role shutdown_roles (No such file or
>>> directory)"
>>>
>>> After looking into this, curiously the interface has moved from
>>> /usr/share/selinux/devel/include/admin/shutdown.if (selinux-policy rpm
>>> in RHEL 6) to /usr/share/selinux/devel/include/contrib/shutdown.if
>>> (selinux-policy-devel rpm in RHEL 7). Should it be in contrib?
>>>
>>> There’s also another issue in that shutdown_exec_t is used in the RHEL 7
>>> interface but it no longer exists because the shutdown binary has been
>>> replaced with a symlink to systemctl.
>>
>> Yes, the shutdown policy is no longer used. power_unit_file_t is being
>> used for /usr/lib/systemd/system/shutdown.target to handle it as a service.
>
> Thanks, the systemd_start_power_services interface works but produced these AVCs:
>
> allow staff_t init_var_run_t:dir write;
> allow staff_t power_unit_file_t:service status;
Thank you for testing.
Could you also attach raw AVC messages?
Apologies for the delay, please see below:
type=USER_AVC msg=audit(1466565200.249:10133): pid=1 uid=0 auid=4294967295 ses=4294967295
subj=system_u:system_r:init_t:s0 msg='avc: received policyload notice (seqno=3)
exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'
type=USER_AVC msg=audit(1466565200.468:10147): pid=1 uid=0 auid=4294967295 ses=4294967295
subj=system_u:system_r:init_t:s0 msg='avc: denied { status } for auid=4959 uid=0
gid=0 path="/usr/lib/systemd/system/reboot.target"
cmdline="/usr/bin/systemctl reboot"
scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023
tcontext=system_u:object_r:power_unit_file_t:s0 tclass=service
exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'
type=SYSCALL msg=audit(1466565200.235:10132): arch=c000003e syscall=83 success=no exit=-13
a0=7fffe605bf80 a1=1c0 a2=7f84b56bc3dc a3=7fffe605bbd0 items=0 ppid=28177 pid=28178
auid=redacted uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=pts0 ses=139
comm="systemd-tty-ask" exe="/usr/bin/systemd-tty-ask-password-agent"
subj=staff_u:staff_r:staff_t:s0-s0:c0.c1023 key=(null)
type=AVC msg=audit(1466565200.235:10132): avc: denied { write } for pid=28178
comm="systemd-tty-ask" name="systemd" dev="tmpfs" ino=6413
scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023
tcontext=system_u:object_r:init_var_run_t:s0 tclass=dir
N.B. We receive the message:
"PolicyKit daemon disconnected from the bus.
We are no longer a registered authentication agent.”
when I run the command (sudo -t staff_t -r staff_r /usr/bin/systemctl reboot) to generate
the AVCs above but the host reboots successfully. There seems to be an existing bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=1205008
Cheers,
Doug