nagios...elinux(8)

💖 NAME

nagios_eventhandler_plugin_selinux — Security Enhanced Linux Policy for the nagios_eventhandler_plugin processes.

This is the nagios...elinux(8) manual, bestie, and it’s giving full SELinux policy realness for the Nagios event handler plugin. 🦋

✨ DESCRIPTION

Security-Enhanced Linux secures the nagios_eventhandler_plugin processes via flexible mandatory access control. Iconic. 👑

The nagios_eventhandler_plugin processes execute with the nagios_eventhandler_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 nagios_eventhandler_plugin_t

🚪 ENTRYPOINTS

The nagios_eventhandler_plugin_t SELinux type can be entered via the nagios_eventhandler_plugin_exec_t file type.

The default entrypoint paths for the nagios_eventhandler_plugin_t domain are the following:

/usr/lib/icinga/plugins/eventhandlers(/.*),
/usr/lib/nagios/plugins/eventhandlers(/.*)

🧬 PROCESS TYPES

SELinux defines process types (domains) for each process running on the system. No cap, that’s the whole vibe.

You can see the context of a process using the -Z option to ps.

Policy governs the access confined processes have to files. SELinux nagios_eventhandler_plugin policy is very flexible, allowing users to setup their nagios_eventhandler_plugin processes in as secure a method as possible.

The following process types are defined for nagios_eventhandler_plugin:

• nagios_eventhandler_plugin_t

Note: semanage permissive -a nagios_eventhandler_plugin_t can be used to make the process type nagios_eventhandler_plugin_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

🎚️ BOOLEANS

SELinux policy is customizable based on least access required. nagios_eventhandler_plugin policy is extremely flexible and has several booleans that allow you to manipulate the policy and run nagios_eventhandler_plugin with the tightest access possible.

• deny_execmem — if you want to deny user domains applications to map a memory region as both executable and writable, this is dangerous and the executable should be reported in bugzilla, you must turn on the deny_execmem boolean. Disabled by default. Flip it with setsebool -P deny_execmem 1.
• mmap_low_allowed — if you want to control the ability to mmap a low area of the address space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on the mmap_low_allowed boolean. Disabled by default. Flip it with setsebool -P mmap_low_allowed 1.
• secure_mode_insmod — if you want to disable kernel module loading, you must turn on the secure_mode_insmod boolean. Disabled by default. Flip it with setsebool -P secure_mode_insmod 1.
• selinuxuser_execheap — if you want to allow unconfined executables to make their heap memory executable, you must turn on the selinuxuser_execheap boolean. Doing this is a really bad idea. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla. Disabled by default. Flip it with setsebool -P selinuxuser_execheap 1.
• selinuxuser_execstack — if you want to allow unconfined executables to make their stack executable, you must turn on the selinuxuser_execstack boolean. This should never, ever be necessary. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla. Disabled by default. Flip it with setsebool -P selinuxuser_execstack 1.

📁 MANAGED FILES

The SELinux process type nagios_eventhandler_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.

• file_type — all files on the system.

🏷️ FILE CONTEXTS

SELinux requires files to have an extended attribute to define the file type.

You can see the context of a file using the -Z option to ls.

Policy governs the access confined processes have to these files. SELinux nagios_eventhandler_plugin policy is very flexible, allowing users to setup their nagios_eventhandler_plugin processes in as secure a method as possible.

🎀 STANDARD FILE CONTEXT

SELinux defines the file context types for the nagios_eventhandler_plugin, if you wanted to store files with these types in a different paths, you need to execute the semanage command to specify alternate labeling and then use restorecon to put the labels on disk.

semanage fcontext -a -t nagios_eventhandler_plugin_exec_t
'/srv/nagios_eventhandler_plugin/content(/.*)?'
restorecon -R -v /srv/mynagios_eventhandler_plugin_content

Note: SELinux often uses regular expressions to specify labels that match multiple files.

The following file types are defined for nagios_eventhandler_plugin:

• nagios_eventhandler_plugin_exec_t — Set files with the nagios_eventhandler_plugin_exec_t type, if you want to transition an executable to the nagios_eventhandler_plugin_t domain.

Paths:

/usr/lib/icinga/plugins/eventhandlers(/.*),
/usr/lib/nagios/plugins/eventhandlers(/.*)

• nagios_eventhandler_plugin_tmp_t — Set files with the nagios_eventhandler_plugin_tmp_t type, if you want to store nagios eventhandler 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.

🛠️ COMMANDS

• semanage fcontext can also be used to manipulate default file context mappings.
• 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.

✍️ AUTHOR

This manual page was auto-generated using sepolicy manpage.

👀 SEE ALSO

• selinux(8)
• nagios_eventhandler_plugin(8)
• semanage(8)
• restorecon(8)
• chcon(1)
• sepolicy(8)
• setsebool(8)

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💖 Sign-off cuties: source/version is nagios_eventhandler_plugin, date is 26-10-06, and the manual name is nagios...elinux(8). Byeee! 🫶