ndc_selinux(8)

✨ ndc_selinux(8) — the SELinux glow-up for ndc ✨

okay bestie, so the manual name here is ndc_selinux, and this whole page is literally the SELinux Policy handbook for the ndc processes. buckle up, it's giving security lore 💅

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💖 NAME 💖

ndc_selinux — the Security Enhanced Linux Policy for the ndc processes. that's it, that's the vibe. 🎀

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the ndc processes via flexible mandatory access control. yes, mandatory — SELinux isn't asking, it's telling. 👑

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

for example:

ps -eZ | grep ndc_t

look at you go, checking contexts like a main character. ✨

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🦋 ENTRYPOINTS 🦋

The ndc_t SELinux type can be entered via the ndc_exec_t file type. that's the doorway, the portal, the ~entrypoint~ if you will 🚪✨

the default entrypoint paths for the ndc_t domain are literally these:

/usr/bin/r?ndc

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🔥 PROCESS TYPES 🔥

SELinux defines process types (domains) for each process running on the system. every process gets a little domain, like a group chat of its own.

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

Policy governs the access confined processes have to files. SELinux ndc policy is very flexible, allowing users to set up their ndc processes in as secure a method as possible. flexible and secure, we love a multitasker 💅

the following process types are defined for ndc:

ndc_t

Note: semanage permissive -a ndc_t can be used to make the process type ndc_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. so like... it's chill but it's still watching you 👀

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🍓 BOOLEANS 🍓

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

if you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. enabled by default, so it's already slaying.

setsebool -P fips_mode 1

if you want to allow system to run with NIS, you must turn on the nis_enabled boolean. disabled by default, so you gotta flip it yourself.

setsebool -P nis_enabled 1

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🌈 MANAGED FILES 🌈

The SELinux process type ndc_t can manage files labeled with the following file types. the paths listed are the default paths for these file types. and heads up — the processes UID still needs to have DAC permissions. SELinux isn't doing everything for you, bestie 😭

krb5_host_rcache_t

/var/tmp/krb5_0.rcache2
/var/cache/krb5rcache(/.*)?
/var/tmp/nfs_0
/var/tmp/DNS_25
/var/tmp/host_0
/var/tmp/imap_0
/var/tmp/HTTP_23
/var/tmp/HTTP_48
/var/tmp/ldap_55
/var/tmp/ldap_487
/var/tmp/ldapmap1_0

look at all those paths, a whole little family 🫶

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🧚 FILE CONTEXTS 🧚

SELinux requires files to have an extended attribute to define the file type. yes, every file needs its little label, it's giving name tags at a party 🎀

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 ndc policy is very flexible, allowing users to set up their ndc processes in as secure a method as possible.

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for ndc. 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. relocation, but make it secure ✨

semanage fcontext -a -t ndc_exec_t '/srv/ndc/content(/.*)?'
restorecon -R -v /srv/myndc_content

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

the following file types are defined for ndc:

ndc_exec_t

• set files with the ndc_exec_t type if you want to transition an executable to the ndc_t domain. that's the transition pipeline, no cap 🔥

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 — 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. a whole GUI, for the visual learners 🌸

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💜 AUTHOR 💜

This manual page was auto-generated using sepolicy manpage. the robots did this one, we're just vibing with it 🤖✨

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🎀 SEE ALSO 🎀

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

go read those too, iykyk 📚

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and that's the page, bestie — it's ndc on the source line, dated 26-10-06, and it's filed under ndc_selinux(8). slay, you're officially SELinux literate 💖🦋✨