nscd_selinux(8)

💅 nscd_selinux — the SELinux glow-up for nscd

okay bestie, welcome to the nscd_selinux(8) page — this is the SELinux policy manual for the nscd processes, and yes it's giving very "niche but iconic" 🎀

✨ NAME ✨

nscd_selinux — Security Enhanced Linux Policy for the nscd processes 🫶

🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the nscd processes via flexible mandatory access control. fr fr, that's the whole vibe.

The nscd processes execute with the nscd_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 nscd_t

🦋 ENTRYPOINTS 🦋

The nscd_t SELinux type can be entered via the nscd_exec_t file type. that's the doorway, bestie 🚪✨

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

/usr/bin/nscd

👑 PROCESS TYPES 👑

SELinux defines process types (domains) for each process running on the system. yes, every single one gets a little label 💅

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

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

The following process types are defined for nscd:

nscd_t

Note: semanage permissive -a nscd_t can be used to make the process type nscd_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 snitching 😭

🔥 BOOLEANS 🔥

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

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

If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.

setsebool -P nis_enabled 1

If you want to allow samba to act as the domain controller, add users, groups and change passwords, you must turn on the samba_domain_controller boolean. Disabled by default.

setsebool -P samba_domain_controller 1

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🧚 MANAGED FILES 🧚

The SELinux process type nscd_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 — SELinux is not out here doing DAC's job, okurrr 🙈

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

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

nscd_log_t

/var/log/nscd.log.*

nscd_var_run_t

/run/nscd(/.*)?
/var/db/nscd(/.*)?
/var/lib/nscd(/.*)?
/var/cache/nscd(/.*)?
/run/nscd.pid
/run/nscd/socket

root_t

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

security_t

/selinux

💜 FILE CONTEXTS 💜

SELinux requires files to have an extended attribute to define the file type. yes, files have lore now ✨

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 nscd policy is very flexible allowing users to setup their nscd processes in as secure a method as possible. (yes we said that already, it bears repeating 💅)

🎀 STANDARD FILE CONTEXT 🎀

SELinux defines the file context types for the nscd. 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. the two-step of it all 🫶

semanage fcontext -a -t nscd_var_run_t '/srv/nscd/content(/.*)?'
restorecon -R -v /srv/mynscd_content

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

The following file types are defined for nscd:

• nscd_exec_t — Set files with the nscd_exec_t type, if you want to transition an executable to the nscd_t domain.
• nscd_initrc_exec_t — Set files with the nscd_initrc_exec_t type, if you want to transition an executable to the nscd_initrc_t domain.
• nscd_log_t — Set files with the nscd_log_t type, if you want to treat the data as nscd log data, usually stored under the /var/log directory.
• nscd_unit_file_t — Set files with the nscd_unit_file_t type, if you want to treat the files as nscd unit content.
• nscd_var_run_t — Set files with the nscd_var_run_t type, if you want to store the nscd files under the /run or /var/run directory.

Paths for nscd_var_run_t:

/run/nscd(/.*)?, /var/db/nscd(/.*)?, /var/lib/nscd(/.*)?,
/var/cache/nscd(/.*)?, /run/nscd.pid, /run/nscd/socket

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. no cap — chcon is a fling, semanage fcontext is the whole relationship 😭

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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 when you simply cannot with the terminal 🎀

⭐ AUTHOR ⭐

This manual page was auto-generated using sepolicy manpage. (a bot wrote this and honestly? it ate 💀✨)

🌸 SEE ALSO 🌸

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

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that's the whole page bestie, you're officially an nscd_t scholar 👑🫶

nscd — 26-10-06 — nscd_selinux(8) — page source/version and date, signed off with love 💖