Bug 1854471
| Summary: | when staff_u user logs in, user pulseaudio service triggers { nnp_transition } denial | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 8 | Reporter: | Milos Malik <mmalik> |
| Component: | selinux-policy | Assignee: | Zdenek Pytela <zpytela> |
| Status: | CLOSED ERRATA | QA Contact: | Milos Malik <mmalik> |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | 8.3 | CC: | lvrabec, miturria, mmalik, plautrba, ssekidde |
| Target Milestone: | rc | Keywords: | AutoVerified, Triaged |
| Target Release: | 8.4 | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | No Doc Update | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2021-05-18 14:57:54 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: | |||
| Bug Blocks: | 1778780 | ||
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?
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;
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 |
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