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Bug 1184073

Summary: NTP cannot be enabled or disabled using gnome-control-center: SELinux policy denies access.
Product: Red Hat Enterprise Linux 7 Reporter: Karol Babioch <kbabioch>
Component: selinux-policyAssignee: Miroslav Grepl <mgrepl>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.0CC: kbabioch, lvrabec, mgrepl, mmalik, nobody, oliver, plautrba, pvrabec, ssekidde
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-3.13.1-24.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-11-19 10:25:26 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Karol Babioch 2015-01-20 14:30:12 UTC 
Description of problem:

Using the gnome-control-center it is not possible to change the NTP status. It cannot be disabled.

Version-Release number of selected component (if applicable):

chrony-1.29.1-1.el7.x86_64
control-center-3.8.6-15.el7.x86_64

How reproducible:

Try to disable NTP using the gnome-control-center


Steps to Reproduce:
1. Go into the Date & Time settings of gnome
2. Try to disable NTP
3. Look into /var/log/messages

Actual results:

- NTP/chrony not disabled

Expected results:

- NTP/chrony disabled


Additional info:

Jan 20 15:26:24 kbabioch dbus-daemon: dbus[985]: [system] Activating via systemd: service name='org.freedesktop.timedate1' unit='dbus-org.freedesktop.timedate1.service'
Jan 20 15:26:24 kbabioch dbus[985]: [system] Activating via systemd: service name='org.freedesktop.timedate1' unit='dbus-org.freedesktop.timedate1.service'
Jan 20 15:26:24 kbabioch systemd: Starting Time & Date Service...
Jan 20 15:26:24 kbabioch dbus-daemon: dbus[985]: [system] Successfully activated service 'org.freedesktop.timedate1'
Jan 20 15:26:24 kbabioch dbus[985]: [system] Successfully activated service 'org.freedesktop.timedate1'
Jan 20 15:26:24 kbabioch systemd: Started Time & Date Service.
Jan 20 15:26:27 kbabioch systemd: SELinux policy denies access.
Jan 20 15:26:27 kbabioch systemd-timedated: Failed to issue method call: Access denied
Jan 20 15:26:27 kbabioch gnome-session: (gnome-control-center:22241): datetime-cc-panel-WARNING **: Could not set system to use NTP: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: SELinux policy denies access.
Jan 20 15:26:27 kbabioch systemd: SELinux policy denies access.
Jan 20 15:26:27 kbabioch systemd-timedated: Failed to issue method call: Access denied
Jan 20 15:26:27 kbabioch gnome-session: (gnome-control-center:22241): datetime-cc-panel-WARNING **: Could not set system to use NTP: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: SELinux policy denies access.

[root@kbabioch certs]# sestatus
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      28
Comment 1 Karol Babioch 2015-01-20 14:31:32 UTC 
Further information about the policies in place:


selinux-policy.noarch                  3.12.1-153.el7_0.13         @internal-it-stage-rhel-x86_64-workstation-7
selinux-policy-targeted.noarch         3.12.1-153.el7_0.13
Comment 2 Karol Babioch 2015-01-20 14:33:04 UTC 
Further information about the policies in place:


selinux-policy.noarch                  3.12.1-153.el7_0.13         @internal-it-stage-rhel-x86_64-workstation-7
selinux-policy-targeted.noarch         3.12.1-153.el7_0.13
Comment 4 Karol Babioch 2015-01-20 14:54:14 UTC 
This is a line from the audit log:

type=USER_AVC msg=audit(1421765583.172:929): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='avc:  denied  { enable } for auid=-1 uid=-1 gid=-1 path="system" scontext=system_u:system_r:systemd_timedated_t:s0 tcontext=system_u:system_r:init_t:s0 tclass=system  exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'
Comment 5 Milos Malik 2015-01-20 15:47:43 UTC 
Are you able to reproduce it on RHEL-7.1 nightly build?

There was some confusion between tclass=system and tclass=service in RHEL-7.0 in systemd tools.

Based on latest RHEL-7.1 policy it should be allowed:

# rpm -qa selinux-policy\*
selinux-policy-3.13.1-16.el7.noarch
selinux-policy-targeted-3.13.1-16.el7.noarch
selinux-policy-doc-3.13.1-16.el7.noarch
selinux-policy-mls-3.13.1-16.el7.noarch
selinux-policy-minimum-3.13.1-16.el7.noarch
selinux-policy-devel-3.13.1-16.el7.noarch
# sesearch -s systemd_timedated_t -p enable -A -C
Found 2 semantic av rules:
   allow systemd_timedated_t chronyd_unit_file_t : service { start stop status reload enable disable } ; 
   allow systemd_timedated_t ntpd_unit_file_t : service { start stop status reload enable disable } ; 
#
Comment 6 Karol Babioch 2015-01-28 08:44:20 UTC 
(In reply to Milos Malik from comment #5)
> Are you able to reproduce it on RHEL-7.1 nightly build?
> 
> There was some confusion between tclass=system and tclass=service in
> RHEL-7.0 in systemd tools.
> 
> Based on latest RHEL-7.1 policy it should be allowed:

Yes, I've just tested it and it does work fine with RHEL 7.1. I've only used the RHEL 7.1 ISO (20141204.2), though.
Comment 11 errata-xmlrpc 2015-11-19 10:25:26 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-2300.html