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Bug 1815621 - SELinux policy prevents /usr/lib64/nagios/plugins/check_file_age from working via NRPE
Summary: SELinux policy prevents /usr/lib64/nagios/plugins/check_file_age from working...
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
high
high
Target Milestone: rc
: 8.3
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-03-20 18:30 UTC by James Ralston
Modified: 2020-11-04 01:57 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-11-04 01:56:06 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 01:56:32 UTC

Description James Ralston 2020-03-20 18:30:30 UTC 
Description of problem:

Current SELinux policy prevents /usr/lib64/nagios/plugins/check_file_age from working in any way when called via NRPE.

In RHEL8, check_file_age is a perl script, and SELinux policy blocks perl from being able to execute it:

type=AVC msg=audit(1584727714.401:2456): avc:  denied  { execute } for  pid=25648 comm="check_file_age" path="/usr/bin/perl" dev="dm-0" ino=8986739 scontext=system_u:system_r:nagios_admin_plugin_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1
type=AVC msg=audit(1584727714.401:2456): avc:  denied  { map } for  pid=25648 comm="check_file_age" path="/usr/bin/perl" dev="dm-0" ino=8986739 scontext=system_u:system_r:nagios_admin_plugin_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1

Version-Release number of selected component (if applicable):

selinux-policy-targeted-3.14.3-20.el8.noarch

How reproducible:

Configure an NRPE check to call check_file_age via nrpe.
Comment 1 James Ralston 2020-03-20 18:52:29 UTC 
We maintain a local SELinux policy module, and I can confirm that the following SELinux boolean, when enabled, resolves the issue:

## <desc>
##  <p>
##    Permit check_file_age to work.
##  </p>
##  <p>
##    See: https://bugzilla.redhat.com/show_bug.cgi?id=1815621
##  </p>
## </desc>

gen_tunable(local_nagios_uses_check_file_age, false)

gen_require(`
    type nagios_admin_plugin_t;
    type bin_t;
    class file { execute map };
')

tunable_policy(`local_nagios_uses_check_file_age',`
    allow nagios_admin_plugin_t bin_t:file { execute map };
')
Comment 2 Florian Apolloner 2020-03-30 10:03:49 UTC 
The check_mailq plugin is affected by the same issue:

type=AVC msg=audit(1585562084.441:29236): avc:  denied  { map } for  pid=20025 comm="check_mailq" path="/usr/bin/perl" dev="dm-0" ino=789560 scontext=system_u:system_r:nagios_mail_plugin_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1
type=AVC msg=audit(1585562084.441:29236): avc:  denied  { execute } for  pid=20025 comm="check_mailq" path="/usr/bin/perl" dev="dm-0" ino=789560 scontext=system_u:system_r:nagios_mail_plugin_t:s0 tcontext=system_u:object_r:bin_t:s0 tclass=file permissive=1
type=SYSCALL msg=audit(1585562084.441:29236): arch=c000003e syscall=59 success=yes exit=0 a0=14aaf30 a1=14ab280 a2=14aaab0 a3=fffffffffffffa86 items=0 ppid=7568 pid=20025 auid=4294967295 uid=992 gid=989 euid=992 suid=992 fsuid=992 egid=989 sgid=989 fsgid=989 tty=(none) ses=4294967295 comm="check_mailq" exe="/usr/bin/perl" subj=system_u:system_r:nagios_mail_plugin_t:s0 key=(null)ARCH=x86_64 SYSCALL=execve AUID="unset" UID="icinga" GID="icinga" EUID="icinga" SUID="icinga" FSUID="icinga" EGID="icinga" SGID="icinga" FSGID="icinga"


In this case the type is `nagios_mail_plugin_t` and the above policy fixes this if I adjust the types accordingly. This might be needed for all perl plugins?
Comment 3 Zdenek Pytela 2020-03-30 12:29:10 UTC 
Florian, James,

There is an attribute:

# seinfo -xanagios_plugin_domain

Type Attributes: 1
   attribute nagios_plugin_domain;
        nagios_admin_plugin_t
        nagios_checkdisk_plugin_t
        nagios_eventhandler_plugin_t
        nagios_mail_plugin_t
        nagios_openshift_plugin_t
        nagios_services_plugin_t
        nagios_system_plugin_t
        nagios_unconfined_plugin_t

 which can be used to allow a group of permissions to, in a similar manner to how permissions are allowed to domains.
Comment 5 Jonte Regnell 2020-06-08 11:55:32 UTC 
RHEL 7 seems to have the same issues after 7.8 upgrade.
Comment 6 Zdenek Pytela 2020-06-08 13:09:11 UTC 
Jonte,

FYI: A bz for RHEL 7 has been created, too, now in VERIFIED state:

bz#1824625
Comment 14 errata-xmlrpc 2020-11-04 01:56:06 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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