Security-Enhanced Linux secures the system_munin_plugin processes via flexible mandatory access control.
The system_munin_plugin processes execute with the system_munin_plugin_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.
For example:
ps -eZ | grep system_munin_plugin_t
The system_munin_plugin_t SELinux type can be entered via the system_munin_plugin_exec_t file type.
The default entrypoint paths for the system_munin_plugin_t domain are the following:
/usr/share/munin/plugins/cpu.*, /usr/share/munin/plugins/if_.*, /usr/share/munin/plugins/nfs.*, /usr/share/munin/plugins/iostat.*, /usr/share/munin/plugins/munin_.*, /usr/share/munin/plugins/acpi, /usr/share/munin/plugins/load, /usr/share/munin/plugins/swap, /usr/share/munin/plugins/forks, /usr/share/munin/plugins/users, /usr/share/munin/plugins/memory, /usr/share/munin/plugins/uptime, /usr/share/munin/plugins/netstat, /usr/share/munin/plugins/threads, /usr/share/munin/plugins/unbound, /usr/share/munin/plugins/irqstats, /usr/share/munin/plugins/proc_pri, /usr/share/munin/plugins/processes, /usr/share/munin/plugins/interrupts, /usr/share/munin/plugins/open_files
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux system_munin_plugin policy is very flexible allowing users to setup their system_munin_plugin processes in as secure a method as possible.
The following process types are defined for system_munin_plugin:
system_munin_plugin_t
Note: semanage permissive -a system_munin_plugin_t can be used to make the process type system_munin_plugin_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 1
The SELinux process type system_munin_plugin_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.
munin_plugin_state_t
/var/lib/munin/plugin-state(/.*)?
munin_var_lib_t
/var/lib/munin(/.*)?
system_munin_plugin_tmp_t
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux system_munin_plugin policy is very flexible allowing users to setup their system_munin_plugin processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the system_munin_plugin, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.
semanage fcontext -a -t system_munin_plugin_tmp_t '/srv/mysystem_munin_plugin_content(/.*)?'
restorecon -R -v /srv/mysystem_munin_plugin_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for system_munin_plugin:
system_munin_plugin_exec_t
- Set files with the system_munin_plugin_exec_t type, if you want to transition an executable to the system_munin_plugin_t domain.
system_munin_plugin_tmp_t
- Set files with the system_munin_plugin_tmp_t type, if you want to store system munin plugin temporary files in the /tmp directories.
Note: File context can be temporarily modified with the chcon command. If you want to permanently change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.
semanage permissive can also be used to manipulate whether or not a process type is permissive.
semanage module can also be used to enable/disable/install/remove policy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.