cachefilesd_selinux(8)

💅 cachefilesd_selinux(8) — the SELinux Policy for cachefilesd, bestie edition 🎀

okay so real talk: this is cachefilesd_selinux(8) from the SELinux Policy cachefilesd collection, and it's literally here to explain how SELinux locks down the cachefilesd processes. no cap, it's a whole thing. let's get into it ✨

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🌸 NAME 🌸

cachefilesd_selinux — the Security Enhanced Linux Policy for the cachefilesd processes. that's the whole vibe. 💖

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🦋 DESCRIPTION 🦋

Security-Enhanced Linux secures the cachefilesd processes via flexible mandatory access control. flexible and mandatory, we love a contradictory queen 👑

The cachefilesd processes execute with the cachefilesd_t SELinux type. wanna check if you've got these processes running? run the ps command with the -Z qualifier, easy.

For example:

ps -eZ | grep cachefilesd_t

that's it. that's the vibe check. 🔍

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✨ ENTRYPOINTS ✨

The cachefilesd_t SELinux type can be entered via the cachefilesd_exec_t file type. it's giving exclusive entrance, one door only 💅

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

/usr/bin/cachefilesd

one path. iconic. 🎀

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👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. every process gets a little domain, main character energy for everyone 🫶

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

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

The following process types are defined for cachefilesd:

• cachefilesd_t
• cachefiles_kernel_t

Note: semanage permissive -a cachefilesd_t can be used to make the process type cachefilesd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like, it stops blocking but it's still gonna gossip about you in the logs 😭

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🔥 BOOLEANS 🔥

SELinux policy is customizable based on least access required. cachefilesd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run cachefilesd with the tightest access possible. tightest access possible = the most locked-down, no cap 🔒

If you want to dontaudit all daemons scheduling requests (setsched, sys_nice), you must turn on the daemons_dontaudit_scheduling boolean. Enabled by default.

setsebool -P daemons_dontaudit_scheduling 1

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

two booleans, both already on. we love a low-maintenance default 💖

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🍓 MANAGED FILES 🍓

The SELinux process type cachefilesd_t can manage files labeled with the following file types. the paths listed are the default paths for these file types. and hiii quick reminder: the process's UID still needs to have DAC permissions. SELinux can't fix your perms for you bestie, that's on you 💀

• cachefiles_var_t

/var/fscache(/.*)?
/var/cache/fscache(/.*)?

• cachefilesd_var_run_t

/run/cachefilesd.pid

• cluster_conf_t

/etc/cluster(/.*)?

• cluster_var_lib_t

/var/lib/pcsd(/.*)?
/var/lib/cluster(/.*)?
/var/lib/openais(/.*)?
/var/lib/pengine(/.*)?
/var/lib/corosync(/.*)?
/usr/lib/heartbeat(/.*)?
/var/lib/heartbeat(/.*)?
/var/lib/pacemaker(/.*)?

• cluster_var_run_t

/run/crm(/.*)?
/run/cman_.*
/run/rsctmp(/.*)?
/run/aisexec.*
/run/heartbeat(/.*)?
/run/pcsd-ruby.socket
/run/corosync-qnetd(/.*)?
/run/corosync-qdevice(/.*)?
/run/pcsd.socket
/run/corosync.pid
/run/cpglockd.pid
/run/rgmanager.pid
/run/cluster/rgmanager.sk

• root_t

/sysroot/.aleph-version.json
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
/var/lib/ntp

like look at all those cluster paths. cachefilesd_t really said "I contain multitudes" 🌸

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🧚 FILE CONTEXTS 🧚

SELinux requires files to have an extended attribute to define the file type. yes, files have vibes too, and those vibes are stored as xattrs ✨

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 cachefilesd policy is very flexible, allowing users to setup their cachefilesd processes in as secure a method as possible. (yes we said this already, it's that important 💅)

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the cachefilesd. if you wanted to store files with these types in 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 cachefilesd_exec_t
'/srv/cachefilesd/content(/.*)?'
restorecon -R -v /srv/mycachefilesd_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. regex girlies rise 🙈

The following file types are defined for cachefilesd:

• cachefilesd_exec_t — Set files with the cachefilesd_exec_t type, if you want to transition an executable to the cachefilesd_t domain.
• cachefilesd_var_run_t — Set files with the cachefilesd_var_run_t type, if you want to store the cachefilesd files under the /run or /var/run directory.

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. chcon is giving temporary tattoo, semanage fcontext is giving full sleeve 🎀

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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 the girlies who don't do terminal (yet) 💖

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🫶 AUTHOR 🫶

This manual page was auto-generated using sepolicy manpage. not me being auto-generated 😭 still ate though.

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💜 SEE ALSO 💜

selinux(8), cachefilesd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8), cachefiles_kernel_selinux(8)

go read them, they're all besties 💅

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and that's the whole page!! source/version cachefilesd, dated 26-10-06, filed under cachefilesd_selinux(8) — slay, bye bestie 👑✨