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Bug 2196524 - hostnamectl and timedatectl are timeouting when running through cluster_t context
Summary: hostnamectl and timedatectl are timeouting when running through cluster_t con...
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
high
Target Milestone: rc
: ---
Assignee: Zdenek Pytela
QA Contact: Milos Malik
Jan Fiala
URL:
Whiteboard:
Depends On: 2193346
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-05-09 12:01 UTC by Welterlen Benoit
Modified: 2023-11-14 17:59 UTC (History)
6 users (show)

Fixed In Version: selinux-policy-3.14.3-120.el8
Doc Type: Bug Fix
Doc Text:
.SELinux policy now allows bidirectional communication on D-Bus Previously, the SELinux policy contained rules to allow only one-way communication between two domains on the D-Bus message bus system. However, such communication must be allowed in both directions. This occurred also when the Pacemaker high-availability cluster resource manager executed the `hostnamectl` or `timedatectl` commands. As a consequence, these commands executed by Pacemaker timed out without receiving a response on D-Bus because SELinux blocked it. This update to the SELinux policy allows bidirectional communication on D-Bus. As a result, commands that require bidirectional communication on D-Bus executed by Pacemaker finish successfully.
Clone Of: 2193346
Environment:
Last Closed: 2023-11-14 15:47:46 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github fedora-selinux selinux-policy pull 1680 0 None Merged Allow cluster_t dbus chat with various services 2023-05-10 09:26:51 UTC
Red Hat Issue Tracker RHELPLAN-156737 0 None None None 2023-05-09 12:03:02 UTC
Red Hat Product Errata RHBA-2023:7091 0 None None None 2023-11-14 15:48:23 UTC

Comment 2 Milos Malik 2023-05-10 07:31:25 UTC 
A simulation of the issue on RHEL-8.9 produced the following SELinux denials in enforcing mode:
----
type=USER_AVC msg=audit(05/10/2023 03:18:18.458:324) : pid=573 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=:1.40 spid=5845 tpid=5844 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:system_r:cluster_t:s0 tclass=dbus permissive=0  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
type=USER_AVC msg=audit(05/10/2023 03:18:43.436:327) : pid=573 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=:1.42 spid=5848 tpid=5847 scontext=system_u:system_r:timedatex_t:s0 tcontext=system_u:system_r:cluster_t:s0 tclass=dbus permissive=0  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----

After removal of the timedatex package and unmasking the systemd-timedated service, the following SELinux denials appeared:
----
type=USER_AVC msg=audit(05/10/2023 03:22:53.131:344) : pid=573 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=:1.51 spid=6116 tpid=6115 scontext=system_u:system_r:systemd_hostnamed_t:s0 tcontext=system_u:system_r:cluster_t:s0 tclass=dbus permissive=0  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
type=USER_AVC msg=audit(05/10/2023 03:23:18.141:348) : pid=573 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=:1.53 spid=6122 tpid=6121 scontext=system_u:system_r:systemd_timedated_t:s0 tcontext=system_u:system_r:cluster_t:s0 tclass=dbus permissive=0  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----

# rpm -qa selinux\* systemd\* | sort
selinux-policy-3.14.3-119.el8.noarch
selinux-policy-targeted-3.14.3-119.el8.noarch
systemd-239-75.el8.x86_64
systemd-libs-239-75.el8.x86_64
systemd-pam-239-75.el8.x86_64
systemd-udev-239-75.el8.x86_64
# ls -lZ /usr/bin/test.sh 
-rwxr-xr-x. 1 root root unconfined_u:object_r:cluster_exec_t:s0 52 May 10 03:15 /usr/bin/test.sh
# cat /usr/bin/test.sh 
#!/bin/bash

hostnamectl status
timedatectl status

# runcon system_u:system_r:initrc_t:s0 bash -c /usr/bin/test.sh
Failed to query system properties: Connection timed out
Failed to query server: Connection timed out
# sesearch -s initrc_t -t cluster_exec_t -T
type_transition initrc_t cluster_exec_t:process cluster_t;
#
Comment 3 Zdenek Pytela 2023-05-10 09:26:51 UTC 
Commit to backport:
ef0d2d76e (HEAD -> rawhide, upstream/rawhide) Allow cluster_t dbus chat with various services
Comment 17 errata-xmlrpc 2023-11-14 15:47:46 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-2023:7091
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