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Bug 1828809 - SELinux prevents the sysadm_u processes from D-bus talk to accounts-daemon
Summary: SELinux prevents the sysadm_u processes from D-bus talk to accounts-daemon
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.2
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: 8.3
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks: 1778780
TreeView+ depends on / blocked
 
Reported: 2020-04-28 11:55 UTC by Milos Malik
Modified: 2021-10-07 12:05 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-11-04 01:56:37 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:4528 0 None None None 2020-11-04 01:57:06 UTC

Description Milos Malik 2020-04-28 11:55:47 UTC 
Description of problem:

Version-Release number of selected component (if applicable):
accountsservice-0.6.50-8.el8.x86_64
accountsservice-libs-0.6.50-8.el8.x86_64
selinux-policy-3.14.3-43.el8.noarch
selinux-policy-devel-3.14.3-43.el8.noarch
selinux-policy-doc-3.14.3-43.el8.noarch
selinux-policy-minimum-3.14.3-43.el8.noarch
selinux-policy-mls-3.14.3-43.el8.noarch
selinux-policy-sandbox-3.14.3-43.el8.noarch
selinux-policy-targeted-3.14.3-43.el8.noarch

How reproducible:
 * always

Steps to Reproduce:
1. get a RHEL-8.2 machine (targeted policy is active)
2. create a sysadm_u user
3. enable the xdm_sysadm_login boolean
4. log into X session as the sysadm_u user
5. click on Account Settings in the menu

Actual results (enforcing mode):
----
type=USER_AVC msg=audit(04/28/2020 13:48:04.224:1036) : pid=1044 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.Accounts member=FindUserById dest=:1.1385 spid=15451 tpid=8747 scontext=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:accountsd_t:s0 tclass=dbus permissive=0  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
type=USER_AVC msg=audit(04/28/2020 13:48:09.130:1039) : pid=1044 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.Accounts member=ListCachedUsers dest=:1.1385 spid=15451 tpid=8747 scontext=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 tcontext=system_u:system_r:accountsd_t:s0 tclass=dbus permissive=0  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----

Expected results:
 * no SELinux denials
Comment 1 Zdenek Pytela 2020-04-28 13:56:50 UTC 
Milosi,

Apart from the denial, was there any problem or did the action continue?

These are rules we currently have in RHEL 8 for user domains:

rhel8# sesearch -A -s userdomain -t accountsd_t -c dbus -p send_msg
allow dbusd_unconfined nsswitch_domain:dbus send_msg;
allow dbusd_unconfined system_bus_type:dbus send_msg;
allow staff_usertype accountsd_t:dbus send_msg;
allow unconfined_t accountsd_t:dbus send_msg;
allow unconfined_t system_bus_type:dbus send_msg;
allow user_usertype accountsd_t:dbus send_msg;
allow xguest_usertype accountsd_t:dbus send_msg;
rhel8# sesearch --dontaudit -s userdomain -t accountsd_t -c dbus -p send_msg
dontaudit xguest_t system_bus_type:dbus send_msg;
Comment 2 Milos Malik 2020-04-28 14:24:47 UTC 
The X session worked fine for the sysadm_u user. There were 2 additional denials related to gnome-keyring-daemon and gsd-rfkill, but that's all.
Comment 4 Zdenek Pytela 2020-06-24 16:30:43 UTC 
I've submitted a Fedora PR to address the issue:
https://github.com/fedora-selinux/selinux-policy/pull/384
Comment 12 errata-xmlrpc 2020-11-04 01:56:37 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-2020:4528
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