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Bug 2124388 - confined users staff_u are creating AVC errors for dbus at GUI login
Summary: confined users staff_u are creating AVC errors for dbus at GUI login
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
: 8.8
Assignee: Zdenek Pytela
QA Contact: Milos Malik
Petr Hybl
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-09-06 00:52 UTC by Daniel Reynolds
Modified: 2023-05-16 11:02 UTC (History)
5 users (show)

Fixed In Version: selinux-policy-3.14.3-109.el8
Doc Type: Bug Fix
Doc Text:
.Confined users now can log in without a reported denial Previously, SELinux policy did not allow all permissions needed to log in a SELinux confined user using GUI. Consequently, AVC denials were audited and some services like `dbus` or `pulseaudio` did not work properly. With this update, the SELinux policy has been updated with new rules for confined users.
Clone Of:
Environment:
Last Closed: 2023-05-16 09:04:16 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github fedora-selinux selinux-policy pull 1430 0 None open Allow login_userdomain dbus chat with rhsmcertd 2022-10-05 17:56:19 UTC
Red Hat Issue Tracker RHELPLAN-133269 0 None None None 2022-09-06 00:55:50 UTC
Red Hat Product Errata RHBA-2023:2965 0 None None None 2023-05-16 09:04:37 UTC

Description Daniel Reynolds 2022-09-06 00:52:32 UTC 
Description of problem:
- Customer is migrating users to be SELinux confined users staff_u.
- When logging into GUI, SELinux AVC errors are generated.

Version-Release number of selected component (if applicable):
- pulseaudio-14.0-3.el8_6.x86_64
- selinux-policy-3.14.3-95.el8_6.4.noarch
- dbus-1.12.8-18.el8_6.1.x86_64

How reproducible: Always


Steps to Reproduce:
1. Create test user
    sudo useradd --groups wheel --selinux-user staff_u test-staff
    sudo passwd test-staff XXXXX
2. Login to test-staff via GUI.
3. Show selinux AVC,AVC_USER errors
    sudo ausearch -m avc,user_avc



Actual results:
- Will see AVC errors for pulseaudio and dbus.
- pulseaudio AVC errors do no reappear on second login, dbus errors do.

pulseaudio AVC errors generated.  Do not occur on second login.
    [snip]
    ----
    time->Tue Sep  6 10:10:41 2022
    type=PROCTITLE msg=audit(1662423041.867:247): proctitle=2F7573722F62696E2F70756C7365617564696F002D2D6461656D6F6E697A653D6E6F002D2D6C6F672D7461726765743D6A6F75726E616C
    type=SYSCALL msg=audit(1662423041.867:247): arch=c000003e syscall=83 success=no exit=-13 a0=55f276de08b0 a1=1c0 a2=ffffffff a3=0 items=0 ppid=3074 pid=3094 auid=1001 uid=1001 gid=1002 euid=1001 suid=1001 fsuid=1001 egid=1002 sgid=1002 fsgid=1002 tty=(none) ses=5 comm="pulseaudio" exe="/usr/bin/pulseaudio" subj=staff_u:staff_r:pulseaudio_t:s0-s0:c0.c1023 key=(null)
    type=AVC msg=audit(1662423041.867:247): avc:  denied  { create } for  pid=3094 comm="pulseaudio" name=".config" scontext=staff_u:staff_r:pulseaudio_t:s0-s0:c0.c1023 tcontext=staff_u:object_r:config_home_t:s0 tclass=dir permissive=0
    [snip]
    ----

dbus AVC errors immidiately after pulseaudio errors.  These always reoccur.

    ----
    time->Tue Sep  6 10:12:05 2022
    type=USER_AVC msg=audit(1662423125.715:294): pid=896 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=:1.386 spid=4090 tpid=2540 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
    ----
    time->Tue Sep  6 10:12:05 2022
    type=USER_AVC msg=audit(1662423125.745:295): pid=896 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=:1.386 spid=4090 tpid=2540 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
    ----
    time->Tue Sep  6 10:12:05 2022
    type=USER_AVC msg=audit(1662423125.781:296): pid=896 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=:1.386 spid=4090 tpid=2540 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
    ----
    time->Tue Sep  6 10:12:05 2022
    type=USER_AVC msg=audit(1662423125.805:297): pid=896 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=:1.386 spid=4090 tpid=2540 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
    ----
    time->Tue Sep  6 10:12:05 2022
    type=USER_AVC msg=audit(1662423125.810:298): pid=896 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=:1.386 spid=4090 tpid=2540 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
    ----
    time->Tue Sep  6 10:12:05 2022
    type=USER_AVC msg=audit(1662423125.825:299): pid=896 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=:1.386 spid=4090 tpid=2540 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
    ----
    time->Tue Sep  6 10:12:05 2022
    type=USER_AVC msg=audit(1662423125.839:300): pid=896 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=:1.386 spid=4090 tpid=2540 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
    ----
    time->Tue Sep  6 10:12:05 2022
    type=USER_AVC msg=audit(1662423125.839:301): pid=896 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=com.redhat.RHSM1.Config member=GetAll dest=:1.386 spid=4090 tpid=2540 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=0  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
    ----
    [snip]


Expected results:
No AVC errors generated.


Additional info:

Opened up two bugs.
1. one for pulseaudio -- 2124387
2. another for dbus -- this

Feel free to close 2124387 if two bug reports are not required.
Comment 1 Zdenek Pytela 2022-09-06 06:37:39 UTC 
Should be resolved with using the rhsmcertd_dbus_chat() interface for login_userdomain.
Comment 2 Milos Malik 2022-10-03 16:28:55 UTC 
Caught in permissive mode:
----
type=USER_AVC msg=audit(10/03/2022 18:25:28.555:576) : pid=930 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=:1.158 spid=10257 tpid=1376 scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=system_u:system_r:rhsmcertd_t:s0 tclass=dbus permissive=1  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
type=USER_AVC msg=audit(10/03/2022 18:25:28.718:577) : pid=930 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=:1.2630 spid=1376 tpid=10257 scontext=system_u:system_r:rhsmcertd_t:s0 tcontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tclass=dbus permissive=1  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
Comment 3 Zdenek Pytela 2022-10-05 18:55:44 UTC 
To backport:
commit 14a208a78ed843964f8f79903d130760aa7a9a4e
Author: Zdenek Pytela <zpytela>
Date:   Wed Oct 5 19:53:23 2022 +0200

    Allow login_userdomain dbus chat with rhsmcertd
Comment 17 errata-xmlrpc 2023-05-16 09:04:16 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-2023:2965
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