727150 – selinux prevents rsyslogd to access snmpd_var_lib_t

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Bug 727150 - selinux prevents rsyslogd to access snmpd_var_lib_t

Summary: selinux prevents rsyslogd to access snmpd_var_lib_t

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	selinux-policy
Sub Component:
Version:	6.1
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	rc
Target Release:	---
Assignee:	Miroslav Grepl
QA Contact:	Karel Srot
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+	depends on / blocked

Reported:	2011-08-01 12:48 UTC by Karel Srot
Modified:	2011-12-06 10:10 UTC (History)
CC List:	2 users (show)
Fixed In Version:	selinux-policy-3.7.19-106.el6
Doc Type:	Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed:	2011-12-06 10:10:11 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Private	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2011:1511	0	normal	SHIPPED_LIVE	selinux-policy bug fix and enhancement update	2011-12-06 00:39:17 UTC

Description Karel Srot 2011-08-01 12:48:11 UTC

Description of problem:

rsyslog module omsnmp (send log messages as snmp traps) will be added in RHEL6.2 (bz 618488). This functionality doesn't work because selinux prevents rsyslog to acces /var/lib/net-snmp.

This is fixed with:

# cat mymod.te

module mymod 1.0;

require {
	type snmpd_var_lib_t;
	type syslogd_t;
	class dir { read getattr open search };
	class file { read getattr open };
}

#============= syslogd_t ==============
allow syslogd_t snmpd_var_lib_t:dir { read getattr open search };
allow syslogd_t snmpd_var_lib_t:file { read getattr open };


Version-Release number of selected component (if applicable):
selinux-policy-3.7.19-93.el6.noarch

How reproducible:
always

Steps to Reproduce:
ATM omsnmp.so module is not built as a part of rsyslog package. You need to udpate rsyslog SPEC file with --enable-snmp to build this module.
After reinstallation of rsyslog configure rsyslog to send snmp traps to snmptrapd.


  
Actual results:
AVC messages during rsyslog start

Expected results:
no AVC, rsyslog sents traps

Additional info:

# grep -i avc /var/log/audit/audit.log
type=AVC msg=audit(1312202141.511:42582): avc:  denied  { getattr } for  pid=11995 comm="rsyslogd" path="/var/lib/net-snmp" dev=sda4 ino=661467 scontext=unconfined_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=dir
type=AVC msg=audit(1312202141.511:42583): avc:  denied  { search } for  pid=11995 comm="rsyslogd" name="net-snmp" dev=sda4 ino=661467 scontext=unconfined_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=dir
type=AVC msg=audit(1312202141.512:42584): avc:  denied  { read } for  pid=11995 comm="rsyslogd" name="mib_indexes" dev=sda4 ino=660458 scontext=unconfined_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=dir
type=AVC msg=audit(1312202141.512:42584): avc:  denied  { open } for  pid=11995 comm="rsyslogd" name="mib_indexes" dev=sda4 ino=660458 scontext=unconfined_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=dir
type=AVC msg=audit(1312202141.512:42585): avc:  denied  { read } for  pid=11995 comm="rsyslogd" name="0" dev=sda4 ino=661355 scontext=unconfined_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=file
type=AVC msg=audit(1312202141.512:42585): avc:  denied  { open } for  pid=11995 comm="rsyslogd" name="0" dev=sda4 ino=661355 scontext=unconfined_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=file
type=AVC msg=audit(1312202141.512:42586): avc:  denied  { getattr } for  pid=11995 comm="rsyslogd" path="/var/lib/net-snmp/mib_indexes/0" dev=sda4 ino=661355 scontext=unconfined_u:system_r:syslogd_t:s0 tcontext=system_u:object_r:snmpd_var_lib_t:s0 tclass=file

Comment 2 Miroslav Grepl 2011-08-01 13:00:53 UTC

Karel,
good catch. Thanks.

Comment 3 Miroslav Grepl 2011-08-02 06:44:29 UTC

Fixed in selinux-policy-3.7.19-106.el6

Comment 6 Karel Srot 2011-08-22 13:55:52 UTC

I confirm this is fixed with selinux-policy-3.7.19-107.el6.noarch

Comment 8 errata-xmlrpc 2011-12-06 10:10:11 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, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1511.html

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