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Bug 2124387 - confined users staff_u are creating AVC errors when pulseaudio starts at GUI login
Summary: confined users staff_u are creating AVC errors when pulseaudio starts at GUI ...
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 00:39 UTC by Daniel Reynolds
Modified: 2023-05-16 11:01 UTC (History)
4 users (show)

Fixed In Version: selinux-policy-3.14.3-109.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
: 2132942 (view as bug list)
Environment:
Last Closed: 2023-05-16 09:03:52 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 1431 0 None open Allow pulseaudio create gnome content (~/.config) 2022-10-05 18:38:39 UTC
Red Hat Issue Tracker RHELPLAN-133268 0 None None None 2022-09-06 00:43:50 UTC
Red Hat Product Errata RHBA-2023:2965 0 None None None 2023-05-16 09:04:05 UTC

Description Daniel Reynolds 2022-09-06 00:39:23 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: On first GUI login


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:
    $ sudo ausearch -m avc,user_avc
    [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
    ----
    time->Tue Sep  6 10:10:42 2022
    type=PROCTITLE msg=audit(1662423042.127:248): proctitle=2F7573722F62696E2F70756C7365617564696F002D2D6461656D6F6E697A653D6E6F002D2D6C6F672D7461726765743D6A6F75726E616C
    type=SYSCALL msg=audit(1662423042.127:248): arch=c000003e syscall=83 success=no exit=-13 a0=558fb61e28b0 a1=1c0 a2=ffffffff a3=0 items=0 ppid=3074 pid=3167 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(1662423042.127:248): avc:  denied  { create } for  pid=3167 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
    ----
    time->Tue Sep  6 10:10:42 2022
    type=PROCTITLE msg=audit(1662423042.521:249): proctitle=2F7573722F62696E2F70756C7365617564696F002D2D6461656D6F6E697A653D6E6F002D2D6C6F672D7461726765743D6A6F75726E616C
    type=SYSCALL msg=audit(1662423042.521:249): arch=c000003e syscall=83 success=no exit=-13 a0=5636c2cbf8b0 a1=1c0 a2=ffffffff a3=0 items=0 ppid=3074 pid=3193 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(1662423042.521:249): avc:  denied  { create } for  pid=3193 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
    ----
    time->Tue Sep  6 10:10:43 2022
    type=PROCTITLE msg=audit(1662423043.063:250): proctitle=2F7573722F62696E2F70756C7365617564696F002D2D6461656D6F6E697A653D6E6F002D2D6C6F672D7461726765743D6A6F75726E616C
    type=SYSCALL msg=audit(1662423043.063:250): arch=c000003e syscall=83 success=no exit=-13 a0=55cdf12168b0 a1=1c0 a2=ffffffff a3=0 items=0 ppid=3074 pid=3219 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(1662423043.063:250): avc:  denied  { create } for  pid=3219 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
    ----
    time->Tue Sep  6 10:10:43 2022
    type=PROCTITLE msg=audit(1662423043.538:251): proctitle=2F7573722F62696E2F70756C7365617564696F002D2D6461656D6F6E697A653D6E6F002D2D6C6F672D7461726765743D6A6F75726E616C
    type=SYSCALL msg=audit(1662423043.538:251): arch=c000003e syscall=83 success=no exit=-13 a0=560f960e98b0 a1=1c0 a2=ffffffff a3=0 items=0 ppid=3074 pid=3243 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(1662423043.538:251): avc:  denied  { create } for  pid=3243 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]

Expected results:
No pulseaudio related AVC errors.


Additional info:
Comment 1 Daniel Reynolds 2022-09-06 00:55:23 UTC 
Opened up two bugs.
1. one for pulseaudio -- this
2. another for dbus -- 2124388

Feel free to close this bug if two bug reports are not helpful.
Comment 2 Zdenek Pytela 2022-09-06 06:34:33 UTC 
Should be resolved with using the gnome_create_home_config_dirs() interface.
Comment 3 Milos Malik 2022-10-03 16:23:22 UTC 
SELinux denial with full auditing details:
----
type=PROCTITLE msg=audit(10/03/2022 18:19:59.393:477) : proctitle=/usr/bin/pulseaudio --daemonize=no --log-target=journal 
type=PATH msg=audit(10/03/2022 18:19:59.393:477) : item=1 name=/home/test-staff/.config nametype=CREATE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=PATH msg=audit(10/03/2022 18:19:59.393:477) : item=0 name=/home/test-staff/ inode=25197786 dev=fd:02 mode=dir,700 ouid=test-staff ogid=test-staff rdev=00:00 obj=staff_u:object_r:user_home_dir_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(10/03/2022 18:19:59.393:477) : cwd=/ 
type=SYSCALL msg=audit(10/03/2022 18:19:59.393:477) : arch=x86_64 syscall=mkdir success=no exit=EACCES(Permission denied) a0=0x55db1dc2a420 a1=0700 a2=0xffffffff a3=0x0 items=2 ppid=6693 pid=6748 auid=test-staff uid=test-staff gid=test-staff euid=test-staff suid=test-staff fsuid=test-staff egid=test-staff sgid=test-staff fsgid=test-staff tty=(none) ses=11 comm=pulseaudio exe=/usr/bin/pulseaudio subj=staff_u:staff_r:pulseaudio_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(10/03/2022 18:19:59.393:477) : avc:  denied  { create } for  pid=6748 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 
----
# rpm -qa | grep -e selinux-policy -e pulseaudio | sort
pulseaudio-14.0-4.el8.x86_64
pulseaudio-libs-14.0-4.el8.x86_64
pulseaudio-libs-glib2-14.0-4.el8.x86_64
pulseaudio-module-bluetooth-14.0-4.el8.x86_64
pulseaudio-module-x11-14.0-4.el8.x86_64
pulseaudio-utils-14.0-4.el8.x86_64
selinux-policy-3.14.3-108.el8.noarch
selinux-policy-devel-3.14.3-108.el8.noarch
selinux-policy-doc-3.14.3-108.el8.noarch
selinux-policy-minimum-3.14.3-108.el8.noarch
selinux-policy-mls-3.14.3-108.el8.noarch
selinux-policy-sandbox-3.14.3-108.el8.noarch
selinux-policy-targeted-3.14.3-108.el8.noarch
#
Comment 4 Milos Malik 2022-10-03 16:26:56 UTC 
The same SELinux denial was caught in permissive mode:
----
type=PROCTITLE msg=audit(10/03/2022 18:25:20.628:574) : proctitle=/usr/bin/pulseaudio --daemonize=no --log-target=journal 
type=PATH msg=audit(10/03/2022 18:25:20.628:574) : item=1 name=/home/test-staff/.config inode=8425822 dev=fd:02 mode=dir,700 ouid=test-staff ogid=test-staff rdev=00:00 obj=staff_u:object_r:config_home_t:s0 nametype=CREATE cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=PATH msg=audit(10/03/2022 18:25:20.628:574) : item=0 name=/home/test-staff/ inode=25197786 dev=fd:02 mode=dir,700 ouid=test-staff ogid=test-staff rdev=00:00 obj=staff_u:object_r:user_home_dir_t:s0 nametype=PARENT cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(10/03/2022 18:25:20.628:574) : cwd=/ 
type=SYSCALL msg=audit(10/03/2022 18:25:20.628:574) : arch=x86_64 syscall=mkdir success=yes exit=0 a0=0x5556b84f5e20 a1=0700 a2=0xffffffff a3=0x0 items=2 ppid=9724 pid=9740 auid=test-staff uid=test-staff gid=test-staff euid=test-staff suid=test-staff fsuid=test-staff egid=test-staff sgid=test-staff fsgid=test-staff tty=(none) ses=18 comm=pulseaudio exe=/usr/bin/pulseaudio subj=staff_u:staff_r:pulseaudio_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(10/03/2022 18:25:20.628:574) : avc:  denied  { create } for  pid=9740 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=1 
----
Comment 5 Zdenek Pytela 2022-10-05 18:56:09 UTC 
To backport:
commit a120005379c8629aa7b6d174d7c763e4f84fedc4 (HEAD -> rawhide, upstream/rawhide, origin/rawhide, origin/HEAD)
Author: Zdenek Pytela <zpytela>
Date:   Wed Oct 5 20:36:22 2022 +0200

    Allow pulseaudio create gnome content (~/.config)
Comment 7 Milos Malik 2022-10-07 08:52:53 UTC 
The same problem is reproducible on RHEL-9.
Comment 16 errata-xmlrpc 2023-05-16 09:03:52 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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