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Bug 1688671

Summary: SELinux is preventing init_t to read session_dbusd_tmp_t directories
Product: Red Hat Enterprise Linux 8 Reporter: Cédric Jeanneret <cjeanner>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED ERRATA QA Contact: Milos Malik <mmalik>
Severity: high Docs Contact:
Priority: medium    
Version: 8.2CC: bnater, jpichon, lvrabec, mmalik, msekleta, plautrba, ssekidde, systemd-maint-list, zpytela
Target Milestone: rcFlags: pm-rhel: mirror+
Target Release: 8.1   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: selinux-policy-3.14.3-6 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-11-05 22:10:18 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:
Embargoed:
Bug Depends On: 1673107    
Bug Blocks:    

Description Cédric Jeanneret 2019-03-14 08:06:15 UTC
Description of problem:


Version-Release number of selected component (if applicable):
rpm-plugin-systemd-inhibit-4.14.2-9.el8.x86_64                                                                                                                                                                                                
python3-systemd-234-8.el8.x86_64                                                                                                                                                                                                              
systemd-libs-239-13.el8.x86_64                                                                                                                                                                                                                
systemd-pam-239-13.el8.x86_64                                                                                                                                                                                                                 
systemd-udev-239-13.el8.x86_64                                                                                                                                                                                                                
systemd-239-13.el8.x86_64                                                                                                                                                                                                                     
oci-systemd-hook-0.1.15-2.git2d0b8a3.module+el8+2769+577ad176.x86_64                                                                                                                                                                          

How reproducible:
Always


Steps to Reproduce:
1. Install a rhel8 system
2. Deploy RHOSP-15
3.

Actual results:
audit.log is spammed with:
type=AVC msg=audit(1552550628.422:5188): avc:  denied  { read } for  pid=95952 comm="systemd-user-ru" name="dbus-1" dev="tmpfs" ino=605557 scontext=system_u:system_r:init_t:s0 tcontext=unconfined_u:object_r:session_dbusd_tmp_t:s0 tclass=dir permissive=0
type=AVC msg=audit(1552550628.423:5189): avc:  denied  { read } for  pid=95952 comm="systemd-user-ru" name="dbus-1" dev="tmpfs" ino=605557 scontext=system_u:system_r:init_t:s0 tcontext=unconfined_u:object_r:session_dbusd_tmp_t:s0 tclass=dir permissive=0

Expected results:
Nothing like this should show up

Additional info:
journald log shows:
Mar 14 08:03:49 undercloud.localdomain setroubleshoot[95890]: SELinux is preventing /usr/lib/systemd/systemd-user-runtime-dir from read access on the directory dbus-1. For complete SELinux messages run: sealert -l d74972a4-9c79-48f7-83b3->
Mar 14 08:03:49 undercloud.localdomain platform-python[95890]: SELinux is preventing /usr/lib/systemd/systemd-user-runtime-dir from read access on the directory dbus-1.
                                                               
                                                               *****  Plugin catchall (100. confidence) suggests   **************************
                                                               
                                                               If you believe that systemd-user-runtime-dir should be allowed read access on the dbus-1 directory by default.
                                                               Then you should report this as a bug.
                                                               You can generate a local policy module to allow this access.
                                                               Do
                                                               allow this access for now by executing:
                                                               # ausearch -c 'systemd-user-ru' --raw | audit2allow -M my-systemduserru
                                                               # semodule -X 300 -i my-systemduserru.pp


The policy looks like:
allow init_t session_dbusd_tmp_t:dir read;

I'm not sure we won't need write or other rights (will test on my own and report update here).

Thank you for your support!

Cheers,

C.

Comment 5 Milos Malik 2019-04-26 08:58:47 UTC
Is it possible that the directory (mentioned in comment#0) was mislabeled ?

# find /run/ -context \*session_dbusd_tmp_t\*
/run/user/0/dbus-1
/run/user/0/dbus-1/services
/run/user/42/dbus-1
/run/user/42/dbus-1/services
# restorecon -Rv /run/
Relabeled /run/user/0/dbus-1 from unconfined_u:object_r:session_dbusd_tmp_t:s0 to unconfined_u:object_r:user_tmp_t:s0
Relabeled /run/user/0/dbus-1/services from unconfined_u:object_r:session_dbusd_tmp_t:s0 to unconfined_u:object_r:user_tmp_t:s0
Relabeled /run/user/42/dbus-1 from unconfined_u:object_r:session_dbusd_tmp_t:s0 to unconfined_u:object_r:user_tmp_t:s0
Relabeled /run/user/42/dbus-1/services from unconfined_u:object_r:session_dbusd_tmp_t:s0 to unconfined_u:object_r:user_tmp_t:s0
#

Comment 6 Lukas Vrabec 2019-05-17 21:18:31 UTC
commit 1f11e1d145b299da5899271b7af4f4b2bb3c2dea (HEAD -> rhel8.1-base, origin/rhel8.1-base)
Author: Lukas Vrabec <lvrabec>
Date:   Fri May 17 23:16:50 2019 +0200

    Allow init_t to manage session_dbusd_tmp_t dirs
    Resolves: rhbz#1688671

commit ad0ca80e163eb102b1fc9eb6322d82577c4c5ac8 (HEAD -> rhel8.1-contrib, origin/rhel8.1-contrib)
Author: Lukas Vrabec <lvrabec>
Date:   Fri May 17 23:14:55 2019 +0200

    Label /var/run/user/*/dbus-1 as session_dbusd_tmp_t
    Resolves:rhbz#1688671

Comment 9 Lukas Vrabec 2019-10-29 11:41:46 UTC
*** Bug 1766464 has been marked as a duplicate of this bug. ***

Comment 11 errata-xmlrpc 2019-11-05 22:10:18 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://access.redhat.com/errata/RHBA-2019:3547