RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1749870 - SELinux is preventing pcp-pmda-named from executing /usr/sbin/rndc
Summary: SELinux is preventing pcp-pmda-named from executing /usr/sbin/rndc
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: pcp
Version: 7.8
Hardware: All
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 7.9
Assignee: Nathan Scott
QA Contact: Jan Kurik
URL:
Whiteboard:
Depends On:
Blocks: 1782202
TreeView+ depends on / blocked
 
Reported: 2019-09-06 15:46 UTC by Jan Kurik
Modified: 2021-08-27 22:34 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-09-29 19:24:55 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2020:3869 0 None None None 2020-09-29 19:25:25 UTC

Description Jan Kurik 2019-09-06 15:46:48 UTC 
Description of problem:
pcp-pmda-named uses /usr/sbin/rndc to get data from named.
Unfortunately when pcp-pmda-named executes /usr/sbin/rndc the execution fails due to missing SELinux rule allowing the execution of rndc.


Version-Release number of selected component (if applicable):
pcp-4.3.2-6.el7.x86_64
selinux-policy-3.13.1-258.el7.noarch
pcp-selinux-4.3.2-6.el7.x86_64
pcp-pmda-named-4.3.2-6.el7.x86_64


How reproducible:
Always

Steps to Reproduce:
1. Install pcp with pcp-pmda-named
2. Install bind, bind-chroot, caching-nameserver, bind-utils packages
3. Configure bind as a caching nameserver
4. Start PCP as well as bind
5. Use i.e. "dig @127.0.0.1" to query DNS

Actual results:
Output of "audit2allow -a" shows:
<stdout>
#============= pcp_pmcd_t ==============
allow pcp_pmcd_t ndc_exec_t:file execute;
</stdout>

Expected results:
Output of "audit2allow -a" should be empty


Additional info:
Comment 5 Nathan Scott 2020-04-05 23:07:21 UTC 
Hmm, strange - the policy patch definitely has these changes...

$ grep ndc_exec_t *
selinux-policy.patch:+  allow [pcp_pmcd_t] [ndc_exec_t] : [file] { execute };
selinux-policy.patch:+        type ndc_exec_t;
selinux-policy.patch:+allow pcp_pmcd_t ndc_exec_t:file execute;

Bit of a mystery - is the AVC exactly the same as before Jan?  Thanks.
Comment 6 Jan Kurik 2020-04-06 05:31:18 UTC 
You are right Nathan, it is a different AVC. I am sorry for the confusion.

The AVC it is throwing now is:

# grep 'type=AVC ' /var/log/audit/audit.log | head -n 1
type=AVC msg=audit(1586150510.119:1454): avc:  denied  { execute_no_trans } for  pid=30473 comm="perl" path="/usr/sbin/rndc" dev="vda1" ino=7449669 scontext=system_u:system_r:pcp_pmcd_t:s0 tcontext=system_u:object_r:ndc_exec_t:s0 tclass=file permissive=0

# audit2allow -a
#============= pcp_pmcd_t ==============
allow pcp_pmcd_t ndc_exec_t:file execute_no_trans;


When I apply this ^^^ selinux rule, the test is then passing.
Should I open a new bug for this ?
Comment 7 Nathan Scott 2020-04-06 05:36:40 UTC 
> Should I open a new bug for this ?

Yes please Jan.  Since its relatively low priority and readily worked around, let's aim for 7.10 for that one, unless there's some other need for a 7.9 rebuild.
Comment 8 Jan Kurik 2020-04-06 05:52:00 UTC 
Here is the follow-up: BZ1821122
Comment 10 errata-xmlrpc 2020-09-29 19:24:55 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 (Low: pcp security, 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/RHSA-2020:3869
Note You need to log in before you can comment on or make changes to this bug.