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Bug 1740540 - [RHEL 8.1] avc: denied { search } for comm="rpc.gssd" name="krb5" dev="dm-0"
Summary: [RHEL 8.1] avc: denied { search } for comm="rpc.gssd" name="krb5" dev="dm-0"
Keywords:
Status: CLOSED DUPLICATE of bug 1730144
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.1
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 8.0
Assignee: Lukas Vrabec
QA Contact: BaseOS QE Security Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-08-13 08:49 UTC by Yongcheng Yang
Modified: 2019-08-22 16:40 UTC (History)
6 users (show)

Fixed In Version: selinux-policy-3.14.3-15.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-08-13 11:48:59 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Yongcheng Yang 2019-08-13 08:49:50 UTC 
Description of problem:
Get a new rpc.gssd AVC warning during our RHEL-8.1.0-20190806.2 Kerberos NFS tests:
'''
type=AVC msg=audit(1565683878.027:1500): avc:  denied  { search } for  pid=46828 comm="rpc.gssd" name="krb5" dev="dm-0" ino=33566251 scontext=system_u:system_r:gssd_t:s0 tcontext=system_u:object_r:krb5_keytab_t:s0 tclass=dir permissive=0
'''

Seemingly it occurs when a user reaching files of different UID via Kerberos NFS.
It doesn't affect the function, i.e. file still be reachable as previously.


Version-Release number of selected component (if applicable):
selinux-policy-3.14.3-13.el8 within RHEL-8.1.0-20190806.2
               ^^^^^^^^^^ failed
selinux-policy-3.14.3-9.el8 within RHEL-8.1.0-20190701.0
               ^^^^^^^^^ good

How reproducible:
always

Steps to Reproduce:
1. please find in "Actual results"


Actual results:
[root.0 ~]# useradd krbuser
[root.0 ~]# kadmin -p root/admin -w redhat -q 'addprinc -pw redhat krbuser'
Authenticating as principal root/admin with password.
WARNING: no policy specified for krbuser; defaulting to no policy
Principal "krbuser" created.
[root.0 ~]# su krbuser -c 'echo redhat | kinit -l 10m -r 60m'
Password for testuser:
[root.0 ~]#
[root.0 ~]# grep denied /var/log/audit/audit.log
[root.0 ~]# date > /mnt/file.root
[root.0 ~]# ll /mnt/
total 1028
-rw-------. 1 krbuser krbuser 1048576 Aug 13 04:07 file.krb
-rw-r--r--. 1 nobody  nobody       29 Aug 13 04:11 file.root
[root.0 ~]# cat /mnt/file.krb
cat: /mnt/file.krb: Permission denied
[root.0 ~]# cat /mnt/file.root
Tue Aug 13 04:11:00 EDT 2019
[root.0 ~]# grep denied /var/log/audit/audit.log
[root.0 ~]# su krbuser -c 'cat /mnt/file.root'  <<<<<  AVC warning triggered
Tue Aug 13 04:11:00 EDT 2019
[root.0 ~]# grep denied /var/log/audit/audit.log
type=AVC msg=audit(1565683878.027:1500): avc:  denied  { search } for  pid=46828 comm="rpc.gssd" name="krb5" dev="dm-0" ino=33566251 scontext=system_u:system_r:gssd_t:s0 tcontext=system_u:object_r:krb5_keytab_t:s0 tclass=dir permissive=0
[root.0 ~]#
[root.0 ~]# rpm -q selinux-policy nfs-utils kernel
selinux-policy-3.14.3-13.el8.noarch
nfs-utils-2.3.3-23.el8.x86_64
kernel-4.18.0-128.el8.x86_64


Expected results:
No AVC warning

Additional info:
# failed beaker job in RHEL-8.1.0-20190806.2
https://beaker.engineering.redhat.com/recipes/7225910#task97576284

# passed beaker job in RHEL-8.1.0-20190701.0 (same nfs-utils version with above job)
https://beaker.engineering.redhat.com/recipes/7194089#task97216253
Comment 1 Lukas Vrabec 2019-08-13 11:48:59 UTC 

*** This bug has been marked as a duplicate of bug 1730144 ***
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