Bug 1612430 - SELinux is preventing pkla-check-auth from read access on the file /etc/authselect/nsswitch.conf.
Summary: SELinux is preventing pkla-check-auth from read access on the file /etc/auths...
Keywords:
Status: CLOSED EOL
Alias: None
Product: Fedora
Classification: Fedora
Component: snapd
Version: 28
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Zygmunt Krynicki
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-08-04 08:29 UTC by Mai Ling
Modified: 2019-05-28 22:37 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-05-28 22:37:19 UTC
Type: Bug
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1596753 0 unspecified CLOSED Launching snapd applications changes nsswitch.conf selinux context and breaks other services 2021-02-22 00:41:40 UTC

Internal Links: 1596753

Description Mai Ling 2018-08-04 08:29:59 UTC
Description of problem:
SELinux is preventing pkla-check-auth from read access on the file /etc/authselect/nsswitch.conf.

*****  Plugin restorecon (99.5 confidence) suggests   ************************

If you want to fix the label. 
/etc/authselect/nsswitch.conf default label should be etc_t.
Then you can run restorecon. The access attempt may have been stopped due to insufficient permissions to access a parent directory in which case try to change the following command accordingly.
Do
# /sbin/restorecon -v /etc/authselect/nsswitch.conf

*****  Plugin catchall (1.49 confidence) suggests   **************************

If you believe that pkla-check-auth should be allowed read access on the nsswitch.conf file 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 'pkla-check-auth' --raw | audit2allow -M my-pklacheckauth
# semodule -X 300 -i my-pklacheckauth.pp

Additional Information:
Source Context                system_u:system_r:policykit_auth_t:s0
Target Context                system_u:object_r:unlabeled_t:s0
Target Objects                /etc/authselect/nsswitch.conf [ file ]
Source                        pkla-check-auth
Source Path                   pkla-check-auth
Port                          <Unknown>
Host                          localhost.localdomain
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.14.1-37.fc28.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     localhost.localdomain
Platform                      Linux localhost.localdomain 4.17.9-200.fc28.x86_64
                              #1 SMP Mon Jul 23 21:41:29 UTC 2018 x86_64 x86_64
Alert Count                   429
First Seen                    2018-08-03 10:05:20 EEST
Last Seen                     2018-08-04 10:51:07 EEST
Local ID                      14b42149-494e-4544-8445-4dcebd677840

Raw Audit Messages
type=AVC msg=audit(1533369067.364:1960): avc:  denied  { read } for  pid=15663 comm="pkla-check-auth" name="nsswitch.conf" dev="loop1" ino=818 scontext=system_u:system_r:policykit_auth_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=file permissive=0


Hash: pkla-check-auth,policykit_auth_t,unlabeled_t,file,read


Version-Release number of selected component (if applicable):


How reproducible:
every now and then

Steps to Reproduce:
1. use the desktop
2.
3.

Actual results:
selinux alerts caused by snapd appear https://i.imgur.com/tSiiKLg.png

Expected results:
selinux alerts caused by snapd do not appear

Additional info:

[asus@localhost ~]$ grep /etc/authselect/nsswitch.conf /proc/mounts 
/dev/loop1 /etc/authselect/nsswitch.conf squashfs ro,seclabel,nodev,relatime 0 0

[asus@localhost ~]$ losetup /dev/loop1
/dev/loop1: []: (/var/lib/snapd/snaps/core_4917.snap)

[asus@localhost ~]$ sudo blockdev --getro /dev/loop1
1

Comment 1 C L 2018-08-28 01:55:14 UTC
1596753 may also be related

Comment 2 Ben Cotton 2019-05-02 20:49:21 UTC
This message is a reminder that Fedora 28 is nearing its end of life.
On 2019-May-28 Fedora will stop maintaining and issuing updates for
Fedora 28. It is Fedora's policy to close all bug reports from releases
that are no longer maintained. At that time this bug will be closed as
EOL if it remains open with a Fedora 'version' of '28'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora 28 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events. Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

Comment 3 Ben Cotton 2019-05-28 22:37:19 UTC
Fedora 28 changed to end-of-life (EOL) status on 2019-05-28. Fedora 28 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
are unable to reopen this bug, please file a new report against the
current release. If you experience problems, please add a comment to this
bug.

Thank you for reporting this bug and we are sorry it could not be fixed.


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