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Bug 1831630 - SELinux prevents the sysadm_u user from running rfkill (or gsd-rfkill)
Summary: SELinux prevents the sysadm_u user from running rfkill (or gsd-rfkill)
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.2
Hardware: All
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: 2020-05-05 12:03 UTC by Milos Malik
Modified: 2021-10-07 11:44 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-05-18 14:57:37 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Milos Malik 2020-05-05 12:03:14 UTC 
Description of problem:
 * SELinux denials appear when sysadm_u user runs rfkill
 * SELinux denials appear when sysadm_u user logs into X session (the xdm_sysadm_login boolean is enabled) and gsd-rfkill is executed automagically

Version-Release number of selected component (if applicable):
gnome-settings-daemon-3.32.0-9.el8.x86_64
selinux-policy-3.14.3-43.el8.noarch
selinux-policy-devel-3.14.3-43.el8.noarch
selinux-policy-doc-3.14.3-43.el8.noarch
selinux-policy-minimum-3.14.3-43.el8.noarch
selinux-policy-mls-3.14.3-43.el8.noarch
selinux-policy-sandbox-3.14.3-43.el8.noarch
selinux-policy-targeted-3.14.3-43.el8.noarch
util-linux-2.32.1-22.el8.x86_64

How reproducible:
 * always

Steps to Reproduce:
1. get a RHEL-8.2 machine (targeted policy is active)
2. # useradd -Z sysadm_u sysadm-user
3. # passwd sysadm-user
4. log in as sysadm-user via ssh 
5. run: "rfkill" or "rfkill list" or "rfkill event"

Actual results:
----
type=PROCTITLE msg=audit(05/05/2020 11:13:52.062:1224) : proctitle=/usr/libexec/gsd-rfkill 
type=PATH msg=audit(05/05/2020 11:13:52.062:1224) : item=0 name=/dev/rfkill inode=70108 dev=00:06 mode=character,664 ouid=root ogid=root rdev=0a:3c obj=system_u:object_r:wireless_device_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(05/05/2020 11:13:52.062:1224) : cwd=/home/sysadm-user 
type=SYSCALL msg=audit(05/05/2020 11:13:52.062:1224) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x55627865c000 a2=O_RDWR a3=0x0 items=1 ppid=70498 pid=70880 auid=sysadm-user uid=sysadm-user gid=sysadm-user euid=sysadm-user suid=sysadm-user fsuid=sysadm-user egid=sysadm-user sgid=sysadm-user fsgid=sysadm-user tty=tty2 ses=86 comm=gsd-rfkill exe=/usr/libexec/gsd-rfkill subj=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(05/05/2020 11:13:52.062:1224) : avc:  denied  { read write } for  pid=70880 comm=gsd-rfkill name=rfkill dev="devtmpfs" ino=70108 scontext=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:wireless_device_t:s0 tclass=chr_file permissive=0 
----
type=PROCTITLE msg=audit(05/05/2020 11:50:28.578:1398) : proctitle=rfkill 
type=PATH msg=audit(05/05/2020 11:50:28.578:1398) : item=0 name=/dev/rfkill inode=70108 dev=00:06 mode=character,664 ouid=root ogid=root rdev=0a:3c obj=system_u:object_r:wireless_device_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(05/05/2020 11:50:28.578:1398) : cwd=/home/sysadm-user 
type=SYSCALL msg=audit(05/05/2020 11:50:28.578:1398) : arch=x86_64 syscall=openat success=no exit=EACCES(Permission denied) a0=0xffffff9c a1=0x56066f0aea7f a2=O_RDONLY a3=0x0 items=1 ppid=83949 pid=84491 auid=sysadm-user uid=sysadm-user gid=sysadm-user euid=sysadm-user suid=sysadm-user fsuid=sysadm-user egid=sysadm-user sgid=sysadm-user fsgid=sysadm-user tty=tty2 ses=102 comm=rfkill exe=/usr/sbin/rfkill subj=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 key=(null) 
type=AVC msg=audit(05/05/2020 11:50:28.578:1398) : avc:  denied  { read } for  pid=84491 comm=rfkill name=rfkill dev="devtmpfs" ino=70108 scontext=sysadm_u:sysadm_r:sysadm_t:s0-s0:c0.c1023 tcontext=system_u:object_r:wireless_device_t:s0 tclass=chr_file permissive=0 
----

Expected results:
 * no SELinux denials

Additional information:
# ls -iZ /dev/rfkill 
70108 system_u:object_r:wireless_device_t:s0 /dev/rfkill
# matchpathcon /dev/rfkill 
/dev/rfkill	system_u:object_r:wireless_device_t:s0
#
Comment 5 Zdenek Pytela 2021-01-08 16:49:49 UTC 
I've submitted a Fedora draft PR to address the issue:
https://github.com/fedora-selinux/selinux-policy/pull/535
Comment 6 Zdenek Pytela 2021-01-11 09:32:45 UTC 
Merged in rawhide:
commit 440e7f65892d6671e8d376e3d4939f15c82e17e8 (HEAD -> rawhide, upstream/rawhide)
Author: Zdenek Pytela <zpytela>
Date:   Fri Jan 8 17:45:49 2021 +0100

    Allow sysadm read and write /dev/rfkill

    This permission is required to run rfkill which enables or disables
    wireless devices.

    Resolves: rhbz#1831630
Comment 15 errata-xmlrpc 2021-05-18 14:57:37 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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