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Bug 1427415

Summary:	Latest Nagios 4.2.4 broken under SELinux
Product:	Red Hat Enterprise Linux 7	Reporter:	alex
Component:	selinux-policy	Assignee:	Lukas Vrabec <lvrabec>
Status:	CLOSED ERRATA	QA Contact:	Milos Malik <mmalik>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.3	CC:	alex, lenz, lvrabec, mgrepl, mmalik, nduffy, plautrba, pvrabec, ssekidde
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	selinux-policy-3.13.1-175.el7	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-04-10 12:28:17 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 alex 2017-02-28 07:08:44 UTC

Description of problem:

After upgrading to the latest Nagios package available, 4.2.4, the web frontend no longer works with SELinux enabled. I get the following on audit.log

type=AVC msg=audit(1488265620.009:2548): avc:  denied  { read } for  pid=27346 comm="tac.cgi" name="objects.cache" dev="vda3" ino=33626409 scontext=system_u:system_r:nagios_script_t:s0 tcontext=system_u:object_r:nagios_spool_t:s0 tclass=file
type=SYSCALL msg=audit(1488265620.009:2548): arch=c000003e syscall=2 success=no exit=-13 a0=7f2237600430 a1=0 a2=7f2237600210 a3=4 items=0 ppid=26820 pid=27346 auid=4294967295 uid=48 gid=48 euid=48 suid=48 fsuid=48 egid=48 sgid=48 fsgid=48 tty=(none) ses=4294967295 comm="tac.cgi" exe="/usr/lib64/nagios/cgi-bin/tac.cgi" subj=system_u:system_r:nagios_script_t:s0 key=(null)

This might be due to some paths in nagios.cfg changing from /var/log/nagios to /var/spool/nagios, I think.


Steps to Reproduce:

1. Run nagios with SELinux enabled
2. Go to the UI

Actual results:

UI doesn't work

Expected results:

UI works

Comment 2 Milos Malik 2017-02-28 09:42:45 UTC

Following SELinux denial appeared after "service nagios start":
----
type=SYSCALL msg=audit(02/28/2017 04:28:41.347:296) : arch=x86_64 syscall=connect success=no exit=EACCES(Permission denied) a0=0x3 a1=0x7ffdbb915f70 a2=0x21 a3=0xfffffe00 items=0 ppid=1415 pid=1417 auid=unset uid=nagios gid=nagios euid=nagios suid=nagios fsuid=nagios egid=nagios sgid=nagios fsgid=nagios tty=(none) ses=unset comm=nagios exe=/usr/sbin/nagios subj=system_u:system_r:nagios_t:s0 key=(null) 
type=AVC msg=audit(02/28/2017 04:28:41.347:296) : avc:  denied  { connectto } for  pid=1417 comm=nagios path=/var/spool/nagios/cmd/nagios.qh scontext=system_u:system_r:nagios_t:s0 tcontext=system_u:system_r:nagios_t:s0 tclass=unix_stream_socket 
----

Following SELinux denials appeared when I was clicking in the web UI:
----
type=SYSCALL msg=audit(02/28/2017 04:40:37.316:330) : arch=x86_64 syscall=open success=no exit=EACCES(Permission denied) a0=0x7fee9730c3d0 a1=O_RDONLY a2=0x7fee9730c0a0 a3=0x4 items=0 ppid=1709 pid=1755 auid=unset uid=apache gid=apache euid=apache suid=apache fsuid=apache egid=apache sgid=apache fsgid=apache tty=(none) ses=unset comm=outages.cgi exe=/usr/lib64/nagios/cgi-bin/outages.cgi subj=system_u:system_r:nagios_script_t:s0 key=(null) 
type=AVC msg=audit(02/28/2017 04:40:37.316:330) : avc:  denied  { read } for  pid=1755 comm=outages.cgi name=objects.cache dev="dm-1" ino=258425 scontext=system_u:system_r:nagios_script_t:s0 tcontext=system_u:object_r:nagios_spool_t:s0 tclass=file 
----
type=SYSCALL msg=audit(02/28/2017 04:40:36.031:329) : arch=x86_64 syscall=open success=no exit=EACCES(Permission denied) a0=0x7f9997ec0370 a1=O_RDONLY a2=0x7f9997ec0830 a3=0x4 items=0 ppid=1709 pid=1754 auid=unset uid=apache gid=apache euid=apache suid=apache fsuid=apache egid=apache sgid=apache fsgid=apache tty=(none) ses=unset comm=status.cgi exe=/usr/lib64/nagios/cgi-bin/status.cgi subj=system_u:system_r:nagios_script_t:s0 key=(null) 
type=AVC msg=audit(02/28/2017 04:40:36.031:329) : avc:  denied  { read } for  pid=1754 comm=status.cgi name=objects.cache dev="dm-1" ino=258425 scontext=system_u:system_r:nagios_script_t:s0 tcontext=system_u:object_r:nagios_spool_t:s0 tclass=file 
----

Comment 3 Milos Malik 2017-02-28 09:46:23 UTC

Following AVCs appeared in permissive mode:
----
type=SYSCALL msg=audit(02/28/2017 04:43:03.409:335) : arch=x86_64 syscall=fstat success=yes exit=0 a0=0x3 a1=0x7ffe47a0efc0 a2=0x7ffe47a0efc0 a3=0x4 items=0 ppid=1742 pid=1767 auid=unset uid=apache gid=apache euid=apache suid=apache fsuid=apache egid=apache sgid=apache fsgid=apache tty=(none) ses=unset comm=tac.cgi exe=/usr/lib64/nagios/cgi-bin/tac.cgi subj=system_u:system_r:nagios_script_t:s0 key=(null) 
type=AVC msg=audit(02/28/2017 04:43:03.409:335) : avc:  denied  { getattr } for  pid=1767 comm=tac.cgi path=/var/spool/nagios/objects.cache dev="dm-1" ino=258425 scontext=system_u:system_r:nagios_script_t:s0 tcontext=system_u:object_r:nagios_spool_t:s0 tclass=file 
----
type=SYSCALL msg=audit(02/28/2017 04:43:03.409:334) : arch=x86_64 syscall=open success=yes exit=3 a0=0x7fd148dbf3d0 a1=O_RDONLY a2=0x7fd148dbf0a0 a3=0x4 items=0 ppid=1742 pid=1767 auid=unset uid=apache gid=apache euid=apache suid=apache fsuid=apache egid=apache sgid=apache fsgid=apache tty=(none) ses=unset comm=tac.cgi exe=/usr/lib64/nagios/cgi-bin/tac.cgi subj=system_u:system_r:nagios_script_t:s0 key=(null) 
type=AVC msg=audit(02/28/2017 04:43:03.409:334) : avc:  denied  { open } for  pid=1767 comm=tac.cgi path=/var/spool/nagios/objects.cache dev="dm-1" ino=258425 scontext=system_u:system_r:nagios_script_t:s0 tcontext=system_u:object_r:nagios_spool_t:s0 tclass=file 
type=AVC msg=audit(02/28/2017 04:43:03.409:334) : avc:  denied  { read } for  pid=1767 comm=tac.cgi name=objects.cache dev="dm-1" ino=258425 scontext=system_u:system_r:nagios_script_t:s0 tcontext=system_u:object_r:nagios_spool_t:s0 tclass=file 
----

Comment 9 errata-xmlrpc 2018-04-10 12:28:17 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.

https://access.redhat.com/errata/RHBA-2018:0763