unconfin..._selinux(8)

💅 unconfin..._selinux — the unconfined_service_selinux manual, section 8, bestie edition 🎀

okay so you opened the unconfin..._selinux(8) page (yes the title got cut off, it's giving truncated icon energy, we move) and it's all about the SELinux policy for unconfined_service. Sit down, grab a strawberry drink 🍓, and let me walk you through it.

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✨ NAME ✨

unconfined_service_selinux — the Security Enhanced Linux Policy for the unconfined_service processes. That's it, that's the whole vibe. 💜

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the unconfined_service processes via flexible mandatory access control. Flexible! Mandatory! Access control! Slay. 💅

The unconfined_service processes execute with the unconfined_service_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 unconfined_service_t

That's the vibe check right there, bestie. 🔍

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🦋 ENTRYPOINTS 🦋

The unconfined_service_t SELinux type can be entered via the usr_t, shell_exec_t, bin_t file types.

The default entrypoint paths for the unconfined_service_t domain are the following — and listen, this list is LONG, it's giving main character energy, every single one stays:

All executables with the default executable label, usually stored in /usr/bin and /usr/sbin.  /opt/.*, /usr/.*, /hana(/.*)?, /emul/.*,
/export(/.*)?, /ostree(/.*)?, /usr/doc(/.*)?/lib(/.*)?,
/usr/inclu.e(/.*)?, /usr/share/rpm(/.*)?, /usr/share/doc(/.*)?/README.*,
/usr/lib/modules(/.*)/vmlinuz, /usr/lib/modules(/.*)/sysctl.conf,
/usr/lib/modules(/.*)/initramfs.img, /usr/lib/sysimage(/.*)?,
/usr/lib/ostree-boot(/.*)?, /opt, /usr, /emul, /usr/bin/d?ash,
/usr/bin/ksh.*, /usr/bin/zsh.*, /usr/bin/esh, /usr/bin/bash,
/usr/bin/fish, /usr/bin/mksh, /usr/bin/sash, /usr/bin/sesh,
/usr/bin/tcsh, /usr/bin/yash, /usr/bin/bash2, /usr/bin/smrsh,
/usr/bin/nologin, /usr/bin/scponly, /usr/bin/scponlyc,
/usr/libexec/sesh, /usr/bin/git-shell, /usr/libexec/sudo/sesh,
/usr/bin/cockpit-bridge, /usr/libexec/cockpit-agent, /usr/libexec/git-core/git-shell

(and yes /usr/inclu.e(/.*)? is literally written like that in the original — no cap, I'm not touching it, copying it character for character is the assignment 🫶)

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👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system.

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

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

The following process types are defined for unconfined_service:

• unconfined_service_t

Note: semanage permissive -a unconfined_service_t can be used to make the process type unconfined_service_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. So like... it still talks about you, it just doesn't block you. 💀

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🧚 BOOLEANS 🧚

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

All of these are disabled by default, so if you want one, you gotta flip it yourself:

• If you want to allow unconfined_service_t transition to the unconfined user domain, you must turn on the unconfined_service_transition_to_unconfined_user boolean. Disabled by default.

setsebool -P unconfined_service_transition_to_unconfined_user 1

• 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. 🚨

setsebool -P deny_execmem 1

• 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.

setsebool -P mmap_low_allowed 1

• If you want to disable kernel module loading, you must turn on the secure_mode_insmod boolean. Disabled by default.

setsebool -P secure_mode_insmod 1

• 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. 😭

setsebool -P selinuxuser_execheap 1

• 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. 🙈

setsebool -P selinuxuser_execstack 1

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🎀 MANAGED FILES 🎀

The SELinux process type unconfined_service_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. That's right, all of them. Iconic. 👑

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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. (yes, no trailing period in the original, I see it, I'm leaving it, we respect the source 😌)
• system-config-selinux is a GUI tool available to customize SELinux policy settings.

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🌈 AUTHOR 🌈

This manual page was auto-generated using sepolicy manpage. A robot wrote it, and honestly? It ate. 🤖✨

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🔥 SEE ALSO 🔥

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

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and that's the whole page bestie, you're officially unconfined 🦋💖 this lil doc lives under unconfined_service, dated 26-10-06, and it's page unconfin..._selinux(8) of the manual — go forth and semanage responsibly, ily 🫶🎀