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Bug 1362273

Summary: SELinux prevents ModemManager from sending a D-bus message to systemd-logind and vice versa
Product: Red Hat Enterprise Linux 7 Reporter: John Sefler <jsefler>
Component: selinux-policyAssignee: Miroslav Grepl <mgrepl>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.3CC: lvrabec, mgrepl, mmalik, plautrba, pvrabec, ssekidde
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-3.13.1-93.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-11-04 02:35:29 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:
Bug Depends On: 1364485    
Bug Blocks:    

Description John Sefler 2016-08-01 19:24:29 UTC
Description of problem:
While testing rhel73 composes, I see two USER_AVC denied message written to /var/log/audit/audit.log every two minutes which coincides with two systemd messages written to /var/log/messages every two minutes.


Version-Release number of selected component (if applicable):
[root@jsefler-rhel7 ~]# rpm -qa | egrep "selinux|dbus|systemd"
dbus-x11-1.6.12-14.el7.x86_64
systemd-219-24.el7.x86_64
python-slip-dbus-0.4.0-2.el7.noarch
systemd-python-219-24.el7.x86_64
libselinux-python-2.5-4.el7.x86_64
systemd-libs-219-24.el7.x86_64
libselinux-utils-2.5-4.el7.x86_64
selinux-policy-3.13.1-92.el7.noarch
dbus-1.6.12-14.el7.x86_64
selinux-policy-targeted-3.13.1-92.el7.noarch
dbus-python-1.1.1-9.el7.x86_64
oci-systemd-hook-1.10.3-44.el7.x86_64
abrt-dbus-2.1.11-41.el7.x86_64
libselinux-2.5-4.el7.x86_64
docker-selinux-1.10.3-44.el7.x86_64
dbus-glib-0.100-7.el7.x86_64
dbus-libs-1.6.12-14.el7.x86_64
systemd-sysv-219-24.el7.x86_64
dleyna-connector-dbus-0.2.0-1.el7.x86_64


How reproducible:


Steps to Reproduce:
[root@jsefler-rhel7 ~]# service auditd restart
Stopping logging:                                          [  OK  ]
Redirecting start to /bin/systemctl start auditd.service
[root@jsefler-rhel7 ~]# setenforce 1
[root@jsefler-rhel7 ~]# restorecon -Rv /etc /run /var
restorecon reset /run/user/42/gvfs context system_u:object_r:user_tmp_t:s0->system_u:object_r:fusefs_t:s0
restorecon:  Warning no default label for /run/lvmetad.pid
<....cutting out a lot of restorecon Warnings....>
restorecon:  Warning no default label for /var/tmp/sosreport-jsefler-rhel7.usersys.redhat.com-20160720175239.tar.xz.md5
[root@jsefler-rhel7 ~]# START_DATE_TIME=`date "+%m/%d/%Y %T"`
[root@jsefler-rhel7 ~]# 


With two terminals open, watch the tail of these two logs for about four minutes...


[root@jsefler-rhel7 ~]# tail -f /var/log/messages
Aug  1 14:56:01 jsefler-rhel7 systemd: Started Session 141 of user root.
Aug  1 14:56:01 jsefler-rhel7 systemd: Starting Session 141 of user root.
Aug  1 14:58:01 jsefler-rhel7 systemd: Started Session 142 of user root.
Aug  1 14:58:01 jsefler-rhel7 systemd: Starting Session 142 of user root.


[root@jsefler-rhel7 ~]# tail -f /var/log/audit/audit.log | grep AVC
type=USER_AVC msg=audit(1470077761.241:21946): pid=693 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=signal interface=org.freedesktop.login1.Manager member=SessionNew dest=org.freedesktop.DBus spid=691 tpid=720 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=(null)  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
type=USER_AVC msg=audit(1470077761.449:21951): pid=693 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=signal interface=org.freedesktop.login1.Manager member=SessionRemoved dest=org.freedesktop.DBus spid=691 tpid=720 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=(null)  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
type=USER_AVC msg=audit(1470077881.463:21955): pid=693 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=signal interface=org.freedesktop.login1.Manager member=SessionNew dest=org.freedesktop.DBus spid=691 tpid=720 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=(null)  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
type=USER_AVC msg=audit(1470077881.665:21960): pid=693 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=signal interface=org.freedesktop.login1.Manager member=SessionRemoved dest=org.freedesktop.DBus spid=691 tpid=720 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=(null)  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'


Then after four minutes run...

[root@jsefler-rhel7 ~]# ausearch -m AVC -m USER_AVC -m SELINUX_ERR -i -ts ${START_DATE_TIME}
----
type=USER_AVC msg=audit(08/01/2016 14:56:01.241:21946) : pid=693 uid=dbus auid=unset ses=unset subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=signal interface=org.freedesktop.login1.Manager member=SessionNew dest=org.freedesktop.DBus spid=691 tpid=720 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=(null)  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
type=USER_AVC msg=audit(08/01/2016 14:56:01.449:21951) : pid=693 uid=dbus auid=unset ses=unset subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=signal interface=org.freedesktop.login1.Manager member=SessionRemoved dest=org.freedesktop.DBus spid=691 tpid=720 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=(null)  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
type=USER_AVC msg=audit(08/01/2016 14:58:01.463:21955) : pid=693 uid=dbus auid=unset ses=unset subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=signal interface=org.freedesktop.login1.Manager member=SessionNew dest=org.freedesktop.DBus spid=691 tpid=720 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=(null)  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
----
type=USER_AVC msg=audit(08/01/2016 14:58:01.665:21960) : pid=693 uid=dbus auid=unset ses=unset subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=signal interface=org.freedesktop.login1.Manager member=SessionRemoved dest=org.freedesktop.DBus spid=691 tpid=720 scontext=system_u:system_r:systemd_logind_t:s0 tcontext=system_u:system_r:modemmanager_t:s0 tclass=(null)  exe=/usr/bin/dbus-daemon sauid=dbus hostname=? addr=? terminal=?' 
[root@jsefler-rhel7 ~]# 



Actual results:
  above

Expected results:


Additional info:
  When I run with permissive, I do not get the denials every two minutes.

Comment 2 Milos Malik 2016-08-02 11:43:37 UTC
The D-bus messages are blocked in both directions:
----
time->Fri Jul 29 13:55:53 2016
type=USER_AVC msg=audit(1469814953.722:649): pid=778 uid=81 auid=4294967295 ses=4294967295 subj=system_u:system_r:system_dbusd_t:s0-s0:c0.c1023 msg='avc:  denied  { 0x2 } for msgtype=method_call interface=org.freedesktop.login1.Manager member=Inhibit dest=:1.0 spid=11142 tpid=777 scontext=system_u:system_r:modemmanager_t:s0 tcontext=system_u:system_r:systemd_logind_t:s0 tclass=(null)  exe="/usr/bin/dbus-daemon" sauid=81 hostname=? addr=? terminal=?'
----

Comment 7 errata-xmlrpc 2016-11-04 02:35:29 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-2016-2283.html