lpd_selinux(8)

✨ lpd_selinux — bestie edition ✨

okay so this is the manual page for lpd_selinux, the SELinux policy for the lpd processes. it's giving security realness and i'm lowkey obsessed 💅

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💖 NAME 💖

lpd_selinux — Security Enhanced Linux Policy for the lpd processes, fr fr

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the lpd processes via flexible mandatory access control. no cap, it's literally the glow-up your print daemon needed ✨

The lpd processes execute with the lpd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.

for example, bestie:

ps -eZ | grep lpd_t

run that and see what's up 🫶

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🦋 ENTRYPOINTS 🦋

The lpd_t SELinux type can be entered via the lpd_exec_t file type.

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

/usr/bin/lpd

that's the main character right there 👑

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

The following process types are defined for lpd:

lpd_t

Note: semanage permissive -a lpd_t can be used to make the process type lpd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. it's giving "i'm not mad, just disappointed" energy 😭

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🌈 BOOLEANS 🌈

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

• daemons_dontaudit_scheduling — if you want to dontaudit all daemons scheduling requests (setsched, sys_nice), you must turn on this boolean. Enabled by default.

setsebool -P daemons_dontaudit_scheduling 1

• fips_mode — if you want to allow all domains to execute in fips_mode, you must turn on this boolean. Enabled by default.

setsebool -P fips_mode 1

• nis_enabled — if you want to allow system to run with NIS, you must turn on this boolean. Disabled by default.

setsebool -P nis_enabled 1

slay, those booleans are doing the most and we respect it 💜

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🧚 MANAGED FILES 🧚

The SELinux process type lpd_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. iykyk.

• 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

• lpd_tmp_t — no paths listed, it's mysterious like that 🙈
• lpd_var_run_t

/run/lprng(/.*)?
/var/spool/turboprint(/.*)?

• print_spool_t

/var/spool/lpd(/.*)?
/var/spool/cups(/.*)?
/var/spool/cups-pdf(/.*)?

• root_t

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

the way that root_t list is just out here containing the entire filesystem root is iconique and terrifying at the same time 💀

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

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the lpd, 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 lpd_exec_t '/srv/lpd/content(/.*)?'
restorecon -R -v /srv/mylpd_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. it's giving regex realness 🔥

The following file types are defined for lpd:

• lpd_exec_t — Set files with the lpd_exec_t type, if you want to transition an executable to the lpd_t domain.
• lpd_tmp_t — Set files with the lpd_tmp_t type, if you want to store lpd temporary files in the /tmp directories.
• lpd_var_run_t — Set files with the lpd_var_run_t type, if you want to store the lpd files under the /run or /var/run directory.

Paths:

/run/lprng(/.*)?, /var/spool/turboprint(/.*)?

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 labeling is such a mood, choose wisely bestie 🎀

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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.

the semanage family is literally the moment, they ate and left no crumbs 👑

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🌟 AUTHOR 🌟

This manual page was auto-generated using sepolicy manpage. not me being auto-generated and still serving looks ✨

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💖 SEE ALSO 💖

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

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okay that's the whole page bestie, go forth and secure those lpd processes 💜

lpd — version 26-10-06 — lpd_selinux(8) 🎀