RHEL 7 shutdown_run interface

[Douglas Brown]

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.

Thanks,
Doug

[Simon Sekidde]

----- Original Message -----
> From: "Douglas Brown" 
> To: "SELinux Fedora List" 
> Sent: Monday, June 13, 2016 8:52:40 PM
> Subject: RHEL 7 shutdown_run interface
>
> 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)"

I believe you also need shutdown_role(staff_r,staff_t) for this to compile
> 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.
>
> Thanks,
> Doug
>
> --
> selinux mailing list
> [e-mail]
> https://lists.fedoraproject.org/admin/lists/[e-mail]

[Douglas Brown]

On 14/06/2016, 10:38 PM, "Simon Sekidde"  wrote:
> ----- Original Message -----
> > From: "Douglas Brown" 
> > To: "SELinux Fedora List" 
> > Sent: Monday, June 13, 2016 8:52:40 PM
> > Subject: RHEL 7 shutdown_run interface
> >
> > 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)"
>
> I believe you also need shutdown_role(staff_r,staff_t) for this to compile

Thanks Simon, you’re right, shutdown_role is the right way to go, but it produced the same error when trying to load.

Cheers,
Doug

[Miroslav Grepl]

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.

Thank you.
> Thanks,
> Doug
>
> --
> selinux mailing list
> [e-mail]
> https://lists.fedoraproject.org/admin/lists/[e-mail]

[Douglas Brown]

On 16/06/2016, 6:15 PM, "Miroslav Grepl"  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;

Cheers,
Doug

[Miroslav Grepl]

On 06/16/2016 02:04 PM, Douglas Brown wrote:
> On 16/06/2016, 6:15 PM, "Miroslav Grepl"  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?
> Cheers,
> Doug
> --
> selinux mailing list
> [e-mail]
> https://lists.fedoraproject.org/admin/lists/[e-mail]

[Douglas Brown]

On 17/06/2016, 5:42 PM, "Miroslav Grepl"  wrote:
> On 06/16/2016 02:04 PM, Douglas Brown wrote:
> > On 16/06/2016, 6:15 PM, "Miroslav Grepl"  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