Bug 827009

Summary:	SELinux denies read access for snmpd to /var/run/net-snmp
Product:	Red Hat Enterprise Linux 6	Reporter:	John Horne <john.horne>
Component:	selinux-policy	Assignee:	Miroslav Grepl <mgrepl>
Status:	CLOSED DUPLICATE	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	6.2	CC:	dwalsh, mmalik
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-05-31 13:22:16 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description John Horne 2012-05-31 12:18:11 UTC

Description of problem:
Configure snmpd to use a pass_persist program which reads data from a file in /var/run/net-snmp. The program runs as root but is denied read access to the file.

Version-Release number of selected component (if applicable):
net-snmp-5.5-37.el6_2.1.x86_64
selinux-policy-3.7.19-126.el6_2.10.noarch


How reproducible:
Always


Steps to Reproduce:
1. Run root cron job to write to a file in /var/run/net-snmp
2. Configure /etc/snmp/snmpd.conf to run a program using the pass_persist directive which reads the above file.
3. The program will run via snmpd but is denied read access.
4. Running 'semodule -DB' will show the AVCs in /var/log/audit/audit.log
  
Actual results:
No output from the pass_persist program, so snmpd gives the error (in my case):
   SNMPv2-SMI::enterprises.141.1.1.10 = No Such Instance currently
   exists at this OID


Expected results:
Snmpd should have read access to anything in /var/run/net-snmp, so SNMP results should be read and returned to snmpd.

Additional info:
This was discussed on the CentOS mailing list, but has been confirmed on our RHEL 6.2 system as well:
http://lists.centos.org/pipermail/centos/2012-May/126403.html

Comment 1 John Horne 2012-05-31 12:45:05 UTC

Sorry, should have added this:

By default '/var/run/net-snmp' has the context 'system_u:object_r:var_run_t:s0'.
If I run:

   chcon -t snmpd_var_run_t /var/run/net-snmp

then the pass_persist program works fine via snmpd.

Comment 4 Miroslav Grepl 2012-05-31 13:22:16 UTC

This has been fixed.

*** This bug has been marked as a duplicate of bug 822480 ***