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Bug 2040214 - SELinux prevents xdm_t process from talking to timedatex_t process via D-bus
Summary: SELinux prevents xdm_t process from talking to timedatex_t process via D-bus
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.6
Hardware: Unspecified
OS: Linux
medium
medium
Target Milestone: rc
: 8.6
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks: 2008126
TreeView+ depends on / blocked
 
Reported: 2022-01-13 09:21 UTC by Jan Stodola
Modified: 2022-05-10 16:25 UTC (History)
3 users (show)

Fixed In Version: selinux-policy-3.14.3-90.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2022-05-10 15:15:45 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-107777 0 None None None 2022-01-13 09:27:37 UTC
Red Hat Product Errata RHBA-2022:1995 0 None None None 2022-05-10 15:16:08 UTC

Description Jan Stodola 2022-01-13 09:21:51 UTC 
Description of problem:
The following AVCs were found in audit.log after the default package set installation and completing initial-setup:

type=USER_AVC msg=audit(1642064567.567:163): pid=942 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { send_msg } for msgtype=method_call interface=org.freedesktop.DBus.Properties member=GetAll dest=:1.201 spid=6469 tpid=6505 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:timedatex_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'^]UID="dbus" AUID="unset" SAUID="dbus"
type=USER_AVC msg=audit(1642064568.655:164): pid=942 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { send_msg } for msgtype=method_call interface=org.freedesktop.timedate1 member=SetTimezone dest=:1.201 spid=6469 tpid=6505 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:timedatex_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'^]UID="dbus" AUID="unset" SAUID="dbus"


Version-Release number of selected component (if applicable):
RHEL-8.6.0-20220111.0
selinux-policy-3.14.3-86.el8

How reproducible:
Always

Steps to Reproduce:
1. Run the default package set installation (Server with GUI)
2. Reboot to the installed system
3. Accept the EULA in initial-setup and finish it
4. Login to the system and check /var/log/audit/audit.log

Actual results:
AVCs present.

Expected results:
No AVCs.
Comment 1 Milos Malik 2022-01-21 08:34:49 UTC 
Please re-run the scenario in permissive mode and collect SELinux denials which appear:

# ausearch -m avc -m user_avc -m selinux_err -i -ts today

The SELinux denials shown in comment#0 were caught in enforcing mode and we need to know the complete picture in order to fix the issue properly.

Thank you.
Comment 2 Jan Stodola 2022-01-21 16:29:15 UTC 
[root@localhost ~]# getenforce 
Permissive
[root@localhost ~]# ausearch -m avc -m user_avc -m selinux_err -i -ts today
----
type=USER_AVC msg=audit(01/21/22 17:26:04.050:159) : pid=945 uid=dbus auid=unset ses=unset subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { send_msg } for msgtype=method_call interface=org.freedesktop.DBus.Properties member=GetAll dest=:1.232 spid=6459 tpid=6525 scontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:timedatex_t:s0 tclass=dbus permissive=1  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
type=USER_AVC msg=audit(01/21/22 17:26:04.054:160) : pid=945 uid=dbus auid=unset ses=unset subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { send_msg } for msgtype=method_return dest=:1.177 spid=6525 tpid=6459 scontext=system_u:system_r:timedatex_t:s0 tcontext=system_u:system_r:xdm_t:s0-s0:c0.c1023 tclass=dbus permissive=1  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
[root@localhost ~]#
Comment 3 Zdenek Pytela 2022-01-28 16:09:01 UTC 
I've submitted a Fedora PR to address the issue:
https://github.com/fedora-selinux/selinux-policy/pull/1031

Note I was unable to reproduce it: changing timezone did not trigger the denial; there was no "Server with GUI" option in the installation screen; no EULA-accept popped. 
Anyway, the rule looks reasonable.
Comment 4 Zdenek Pytela 2022-01-31 15:15:15 UTC 
To backport:
commit 40a8223b142eb3ed9d63869b5dc447b0ede4ebf3 (HEAD -> rawhide, upstream/rawhide)
Author: Zdenek Pytela <zpytela>
Date:   Fri Jan 28 17:04:07 2022 +0100

    Allow timedatex dbus chat with xdm
Comment 15 errata-xmlrpc 2022-05-10 15:15:45 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 (selinux-policy bug fix and enhancement update), 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://access.redhat.com/errata/RHBA-2022:1995
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