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Bug 1769423 - AVC denial seen executing ipa trust-add
Summary: AVC denial seen executing ipa trust-add
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.1
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-11-06 15:39 UTC by Sergey Orlov
Modified: 2020-11-04 01:57 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-11-04 01:55:53 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2020:4528 0 None None None 2020-11-04 01:56:19 UTC

Description Sergey Orlov 2019-11-06 15:39:07 UTC 
Description of problem:
After establishing trust with Windows AD I see AVC denial

Version-Release number of selected component (if applicable):
ipa-client-4.8.0-11.module+el8.1.0+4247+9f3fd721.x86_64


How reproducible:
Always

Steps to Reproduce:
1. Install ipa server
2. run ipa-adtrust-install
3. setup DNS for establishing trust with AD
4. Check no AVC denials registerd so far: sealert -l '*'
5. execute: echo Secret123 |  ipa trust-add ad.test --admin Administrator --password
6. sealert -l '*'

Actual results:
SELinux is preventing ipa-getkeytab from search access on the directory krb5.

*****  Plugin catchall (100. confidence) suggests   **************************

If you believe that ipa-getkeytab should be allowed search access on the krb5 directory 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 'ipa-getkeytab' --raw | audit2allow -M my-ipagetkeytab
# semodule -X 300 -i my-ipagetkeytab.pp


Additional Information:
Source Context                system_u:system_r:ipa_helper_t:s0
Target Context                system_u:object_r:krb5_keytab_t:s0
Target Objects                krb5 [ dir ]
Source                        ipa-getkeytab
Source Path                   ipa-getkeytab
Port                          <Unknown>
Host                          master1.testrelm.test
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.14.3-20.el8.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     master1.testrelm.test
Platform                      Linux master1.testrelm.test 4.18.0-147.el8.x86_64
                              #1 SMP Thu Sep 26 15:52:44 UTC 2019 x86_64 x86_64
Alert Count                   1
First Seen                    2019-11-06 16:19:57 CET
Last Seen                     2019-11-06 16:19:57 CET
Local ID                      67f70347-d46b-4df1-9d0e-e8b63d7fae27

Raw Audit Messages
type=AVC msg=audit(1573053597.269:109): avc:  denied  { search } for  pid=2425 comm="ipa-getkeytab" name="krb5" dev="vda2" ino=8948995 scontext=system_u:system_r:ipa_helper_t:s0 tcontext=system_u:object_r:krb5_keytab_t:s0 tclass=dir permissive=0


Hash: ipa-getkeytab,ipa_helper_t,krb5_keytab_t,dir,search


Expected results:
No AVC denials

Additional info:
RHEL8.0 does not have the issue
AVC denial is not seen when adding "-type ad" to command line
Comment 1 Sergey Orlov 2019-11-07 15:53:23 UTC 
Few notes:
1) "--type ad" does not change behavior, AVC denial still occurs
2) there is a lag of several seconds between denial event and moment when output of `sealert -l '*'` becomes not empty
3) If you delete and re-add trust, there is no AVC denial, so you need a clean VM for reproducing the issue.
Comment 2 Alexander Bokovoy 2019-11-12 12:01:06 UTC 
Moving to selinux-policy. ipa_helper_t needs to be able to access krb5_keytab_t
Comment 14 errata-xmlrpc 2020-11-04 01:55:53 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-2020:4528
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