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Bug 1854471 - when staff_u user logs in, user pulseaudio service triggers { nnp_transition } denial
Summary: when staff_u user logs in, user pulseaudio service triggers { nnp_transition ...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.3
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: 8.4
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks: 1778780
TreeView+ depends on / blocked
 
Reported: 2020-07-07 14:13 UTC by Milos Malik
Modified: 2021-10-07 11:44 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-05-18 14:57:54 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Milos Malik 2020-07-07 14:13:02 UTC 
Description of problem:
 * the user pulseaudio service is enabled by default
 * the SELinux denial is triggered during the start of user's GNOME environment
 * the user pulseaudio service seems to run without problems
 * but the SELINUX_ERR message is logged

Version-Release number of selected component (if applicable):
pulseaudio-13.99.1-1.el8.x86_64
pulseaudio-libs-13.99.1-1.el8.x86_64
pulseaudio-libs-glib2-13.99.1-1.el8.x86_64
pulseaudio-module-bluetooth-13.99.1-1.el8.x86_64
selinux-policy-3.14.3-48.el8.noarch
selinux-policy-devel-3.14.3-48.el8.noarch
selinux-policy-doc-3.14.3-48.el8.noarch
selinux-policy-targeted-3.14.3-48.el8.noarch

How reproducible:
 * always

Steps to Reproduce:
1. get a RHEL-8.3 machine (targeted policy is active)
2. install all packages from the GNOME group
3. create a staff_u user, set password
4. log in as the user via GDM
5. search for SELinux denials

Actual results:
----
type=PROCTITLE msg=audit(07/07/2020 15:50:23.331:999) : proctitle=/usr/bin/pulseaudio --daemonize=no 
type=PATH msg=audit(07/07/2020 15:50:23.331:999) : item=1 name=/lib64/ld-linux-x86-64.so.2 inode=8389099 dev=08:02 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:ld_so_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=PATH msg=audit(07/07/2020 15:50:23.331:999) : item=0 name=/usr/bin/pulseaudio inode=413670 dev=08:02 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:pulseaudio_exec_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(07/07/2020 15:50:23.331:999) : cwd=/home/staff-user 
type=EXECVE msg=audit(07/07/2020 15:50:23.331:999) : argc=2 a0=/usr/bin/pulseaudio a1=--daemonize=no 
type=SYSCALL msg=audit(07/07/2020 15:50:23.331:999) : arch=x86_64 syscall=execve success=yes exit=0 a0=0x560ecdda8960 a1=0x560ecdd9c830 a2=0x560ecdd957f0 a3=0x560ecdd88610 items=2 ppid=10188 pid=10208 auid=staff-user uid=staff-user gid=staff-user euid=staff-user suid=staff-user fsuid=staff-user egid=staff-user sgid=staff-user fsgid=staff-user tty=(none) ses=33 comm=pulseaudio exe=/usr/bin/pulseaudio subj=staff_u:staff_r:staff_t:s0-s0:c0.c1023 key=(null) 
type=SELINUX_ERR msg=audit(07/07/2020 15:50:23.331:999) : op=security_bounded_transition seresult=denied oldcontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 newcontext=staff_u:staff_r:pulseaudio_t:s0-s0:c0.c1023 
type=AVC msg=audit(07/07/2020 15:50:23.331:999) : avc:  denied  { nnp_transition } for  pid=10208 comm=(lseaudio) scontext=staff_u:staff_r:staff_t:s0-s0:c0.c1023 tcontext=staff_u:staff_r:pulseaudio_t:s0-s0:c0.c1023 tclass=process2 permissive=0 
----

Expected results:
 * no SELinux denials

Additional info:
[staff-user@localhost ~]$ systemctl --user status pulseaudio
● pulseaudio.service - Sound Service
   Loaded: loaded (/usr/lib/systemd/user/pulseaudio.service; enabled; vendor pr>
   Active: active (running) since Tue 2020-07-07 15:50:23 CEST; 19min ago
 Main PID: 10208 (pulseaudio)
   CGroup: /user.slice/user-1000.slice/user/pulseaudio.service
           └─10208 /usr/bin/pulseaudio --daemonize=no
[staff-user@localhost ~]$ ps -efZ | grep pulseaudi[o]
staff_u:staff_r:staff_t:s0-s0:c0.c1023 staff-u+ 10208 10188  0 15:50 ?     00:00:00 /usr/bin/pulseaudio --daemonize=no
Comment 3 Milos Malik 2020-07-15 11:20:10 UTC 
The user_u confined user is affected by the same issue:
----
type=PROCTITLE msg=audit(07/15/2020 13:15:15.759:715) : proctitle=/usr/bin/pulseaudio --daemonize=no 
type=PATH msg=audit(07/15/2020 13:15:15.759:715) : item=1 name=/lib64/ld-linux-x86-64.so.2 inode=8620977 dev=08:02 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:ld_so_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=PATH msg=audit(07/15/2020 13:15:15.759:715) : item=0 name=/usr/bin/pulseaudio inode=621720 dev=08:02 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:pulseaudio_exec_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(07/15/2020 13:15:15.759:715) : cwd=/home/user-user 
type=EXECVE msg=audit(07/15/2020 13:15:15.759:715) : argc=2 a0=/usr/bin/pulseaudio a1=--daemonize=no 
type=SYSCALL msg=audit(07/15/2020 13:15:15.759:715) : arch=x86_64 syscall=execve success=yes exit=0 a0=0x55828183f330 a1=0x55828180bfa0 a2=0x55828180ae70 a3=0x55828184c460 items=2 ppid=38244 pid=38257 auid=user-user uid=user-user gid=user-user euid=user-user suid=user-user fsuid=user-user egid=user-user sgid=user-user fsgid=user-user tty=(none) ses=50 comm=pulseaudio exe=/usr/bin/pulseaudio subj=user_u:user_r:user_t:s0 key=(null) 
type=SELINUX_ERR msg=audit(07/15/2020 13:15:15.759:715) : op=security_bounded_transition seresult=denied oldcontext=user_u:user_r:user_t:s0 newcontext=user_u:user_r:pulseaudio_t:s0 
type=AVC msg=audit(07/15/2020 13:15:15.759:715) : avc:  denied  { nnp_transition } for  pid=38257 comm=(lseaudio) scontext=user_u:user_r:user_t:s0 tcontext=user_u:user_r:pulseaudio_t:s0 tclass=process2 permissive=0 
----

Can we fix both issues in this bug?
Comment 5 Zdenek Pytela 2021-01-08 18:33:05 UTC 
Added with the following commit:
commit 1d38248f221978798c56763d7dbb6ed5390c25d3
Author: secureworkstation <60398077+secureworkstation.github.com>
Date:   Tue Jan 28 17:43:08 2020 +0100

    Allow to use nnp_transition in pulseaudio_role

diff --git a/pulseaudio.if b/pulseaudio.if
index 1e2fb9a0b..4508f98df 100644
--- a/pulseaudio.if
+++ b/pulseaudio.if
@@ -31,6 +31,7 @@ interface(`pulseaudio_role',`

        allow pulseaudio_t $2:process { signal signull };
        allow $2 pulseaudio_t:process { signal signull sigkill };
+       allow $2 pulseaudio_t:process2 nnp_transition;
        ps_process_pattern(pulseaudio_t, $2)

        allow pulseaudio_t $2:unix_stream_socket connectto;
Comment 13 errata-xmlrpc 2021-05-18 14:57:54 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-2021:1639
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