brctl_selinux(8)

💅 brctl_selinux — okay bestie, let's talk SELinux for brctl 🎀

So you wanna know about the SELinux policy for the brctl processes? Say less, I got you. This is brctl_selinux(8) from the SELinux Policy brctl fam, and it's lowkey iconic.

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✨ NAME ✨

brctl_selinux — Security Enhanced Linux Policy for the brctl processes 🦋

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the brctl processes via flexible mandatory access control. Periodt.

The brctl processes execute with the brctl_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier. The way that -Z just adds the security context info? Obsessed.

For example:

ps -eZ | grep brctl_t

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🚪 ENTRYPOINTS 🚪

The brctl_t SELinux type can be entered via the brctl_exec_t file type. It's giving doorway energy.

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

/usr/bin/brctl

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👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. Main character energy for every single process, fr fr.

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

Policy governs the access confined processes have to files. SELinux brctl policy is very flexible allowing users to setup their brctl processes in as secure a method as possible. Flexible AND secure? We love to see it. 💖

The following process types are defined for brctl:

• brctl_t

Note: semanage permissive -a brctl_t can be used to make the process type brctl_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. So like, it's not mad at you anymore but it's still writing it down in its notes. 😭

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🔘 BOOLEANS 🔘

SELinux policy is customizable based on least access required. brctl policy is extremely flexible and has several booleans that allow you to manipulate the policy and run brctl with the tightest access possible. Tightest access = bestie is locked in and protected.

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

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🗂️ MANAGED FILES 🗂️

The SELinux process type brctl_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. Don't forget the UID bestie, it matters.

• sysfs_t
  • /sys(/.*)?

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🏷️ FILE CONTEXTS 🏷️

SELinux requires files to have an extended attribute to define the file type. It's literally how SELinux knows what's what.

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 brctl policy is very flexible allowing users to setup their brctl processes in as secure a method as possible.

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the brctl, 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. Two-step slay.

semanage fcontext -a -t brctl_exec_t '/srv/brctl/content(/.*)?'
restorecon -R -v /srv/mybrctl_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. Regex girlies rise up. 🌈

The following file types are defined for brctl:

• brctl_exec_t
  • Set files with the brctl_exec_t type, if you want to transition an executable to the brctl_t domain.

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. Temporary vs permanent is giving glow-up vs actual transformation ngl.

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🛠️ 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. A whole GUI for your SELinux needs, fancy.

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✍️ AUTHOR ✍️

This manual page was auto-generated using sepolicy manpage . The robots did this one, respectfully. 🤖

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👀 SEE ALSO 👀

selinux(8), brctl(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8)

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That's the whole vibe bestie, you're officially caught up on brctl_selinux. ✨ This page was brought to you by brctl and dated 26-10-06, from the SELinux Policy brctl universe — go be great and stay labeled. 💜🫶