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I'm seeing similar behavior with both the Nagios check_disk and check_nagios plugins when confined by selinux-policy-targeted-3.7.19-126.el6_2.4.noarch. These plugins worked fine with RHEL6.1, and haven't changed in EPEL between 6.1 and 6.2.
With the following in nrpe.cfg:
command[check_nagios]=/usr/lib64/nagios/plugins/check_nagios -e 10 -F /var/log/nagios/status.dat -C /usr/sbin/nagios
command[check_alldisks]=/usr/lib64/nagios/plugins/check_disk --stat-remote-fs -e -x gvfs-fuse-daemon -x nfsd -x nodev -x sysfs -x devpts -x tmpfs -x none -x sunrpc
We can try the checks with something like
/usr/lib64/nagios/plugins/check_nrpe -H localhost -c check_nagios
/usr/lib64/nagios/plugins/check_nrpe -H localhost -c check_alldisks
The check_nagios check gives the following avcs:
Jan 1 11:24:17 triangle kernel: type=1400 audit(1325445857.766:443): avc: denied { search } for pid=9051 comm="check_nagios" name="log" dev=cciss!c0d0p3 ino=307 scontext=system_u:system_r:nagios_system_plugin_t:s0 tcontext=system_u:object_r:var_log_t:s0 tclass=dir
Jan 1 11:24:17 triangle kernel: type=1400 audit(1325445857.848:444): avc: denied { search } for pid=9051 comm="check_nagios" name="nagios" dev=cciss!c0d0p3 ino=1136 scontext=system_u:system_r:nagios_system_plugin_t:s0 tcontext=system_u:object_r:nagios_log_t:s0 tclass=dir
Jan 1 11:24:18 triangle kernel: type=1400 audit(1325445857.930:445): avc: denied { read } for pid=9051 comm="check_nagios" name="status.dat" dev=cciss!c0d0p3 ino=104 scontext=system_u:system_r:nagios_system_plugin_t:s0 tcontext=system_u:object_r:nagios_log_t:s0 tclass=file
While check_disk gives the following:
Jan 1 11:20:38 triangle kernel: type=1400 audit(1325445638.539:6): avc: denied { getattr } for pid=7525 comm="check_disk" name="/" dev=cciss!c0d0p1 ino=2 scontext=system_u:system_r:nagios_system_plugin_t:s0 tcontext=system_u:object_r:fs_t:s0 tclass=filesystem
Jan 1 11:20:38 triangle kernel: type=1400 audit(1325445638.618:7): avc: denied { getattr } for pid=7525 comm="check_disk" name="/" dev=proc ino=1 scontext=system_u:system_r:nagios_system_plugin_t:s0 tcontext=system_u:object_r:proc_t:s0 tclass=filesystem
The checks both succeed if SELinux is put into permissive mode.
I have worked around these problems for the time being with
chcon -t nagios_unconfined_plugin_exec_t check_nagios check_disk
but it would be preferable if SELinux policy were fixed so these plugins continued to work as in 6.1.
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-2012-0780.html
Description of problem: SE Linux silently denies the nagios check_disk plugin to check /boot when executed via the NRPE daemon. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Set up nrpe to execute the following check: command[check_boot]=/usr/lib64/nagios/plugins/check_disk -w 10% -c 5% -p /boot 2. Activate the NRPE check from other host: /usr/lib64/nagios/plugins/check_nrpe -H TESTHOST.redhat.com -c check_boot Actual results: DISK CRITICAL - /boot is not accessible: Permission denied Expected results: DISK OK - free space: /boot 167 MB (77% inode=99%);| /boot=47MB;203;214;0;226 Additional info: I had to run 'semodule -DB' to actually get any output about this in audit.log Once I did, and turned off enforcing, the following is a dump of the relevant entries: type=AVC msg=audit(1323966375.648:38669): avc: denied { getattr } for pid=27971 comm="sh" path="/root" dev=vda3 ino=372417 scontext=unconfined_u:system_r:nrpe_t:s0 tcontext=system_u:object_r:admin_home_t:s0 tclass=dir type=SYSCALL msg=audit(1323966375.648:38669): arch=c000003e syscall=4 success=yes exit=0 a0=cd4430 a1=7fff5c081440 a2=7fff5c081440 a3=3d04d250e0 items=0 ppid=27970 pid=27971 auid=0 uid=99 gid=99 euid=99 suid=99 fsuid=99 egid=99 sgid=99 fsgid=99 tty=(none) ses=20 comm="sh" exe="/bin/bash" subj=unconfined_u:system_r:nrpe_t:s0 key=(null) type=AVC msg=audit(1323966375.648:38670): avc: denied { read write } for pid=27971 comm="check_disk" path="socket:[1026787]" dev=sockfs ino=1026787 scontext=unconfined_u:system_r:nagios_checkdisk_plugin_t:s0 tcontext=unconfined_u:system_r:nrpe_t:s0 tclass=tcp_socket type=AVC msg=audit(1323966375.648:38670): avc: denied { rlimitinh } for pid=27971 comm="check_disk" scontext=unconfined_u:system_r:nrpe_t:s0 tcontext=unconfined_u:system_r:nagios_checkdisk_plugin_t:s0 tclass=process type=AVC msg=audit(1323966375.648:38670): avc: denied { siginh } for pid=27971 comm="check_disk" scontext=unconfined_u:system_r:nrpe_t:s0 tcontext=unconfined_u:system_r:nagios_checkdisk_plugin_t:s0 tclass=process type=AVC msg=audit(1323966375.648:38670): avc: denied { noatsecure } for pid=27971 comm="check_disk" scontext=unconfined_u:system_r:nrpe_t:s0 tcontext=unconfined_u:system_r:nagios_checkdisk_plugin_t:s0 tclass=process type=SYSCALL msg=audit(1323966375.648:38670): arch=c000003e syscall=59 success=yes exit=0 a0=cd9580 a1=cd95e0 a2=cd7690 a3=40 items=0 ppid=27970 pid=27971 auid=0 uid=99 gid=99 euid=99 suid=99 fsuid=99 egid=99 sgid=99 fsgid=99 tty=(none) ses=20 comm="check_disk" exe="/usr/lib64/nagios/plugins/check_disk" subj=unconfined_u:system_r:nagios_checkdisk_plugin_t:s0 key=(null) type=AVC msg=audit(1323966375.650:38671): avc: denied { getattr } for pid=27971 comm="check_disk" path="/boot" dev=vda1 ino=2 scontext=unconfined_u:system_r:nagios_checkdisk_plugin_t:s0 tcontext=system_u:object_r:boot_t:s0 tclass=dir type=SYSCALL msg=audit(1323966375.650:38671): arch=c000003e syscall=4 success=yes exit=0 a0=7fffcb59c782 a1=10c0090 a2=10c0090 a3=10 items=0 ppid=27970 pid=27971 auid=0 uid=99 gid=99 euid=99 suid=99 fsuid=99 egid=99 sgid=99 fsgid=99 tty=(none) ses=20 comm="check_disk" exe="/usr/lib64/nagios/plugins/check_disk" subj=unconfined_u:system_r:nagios_checkdisk_plugin_t:s0 key=(null)