useradd_selinux(8)

💖 useradd_selinux — the SELinux manual page for useradd (yes bestie, the 8 is silent) 💖

okay so this is useradd_selinux(8), the SELinux policy page for the useradd processes. pull up a chair, grab a strawberry 🍓, and let's get into it.

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✨ NAME ✨

useradd_selinux — Security Enhanced Linux Policy for the useradd processes. that's the whole vibe.

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the useradd processes via flexible mandatory access control. flexible! mandatory! access control! we stan a policy that's both 🔥

The useradd processes execute with the useradd_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 useradd_t

go off, ps -Z. show us the contexts. 👑

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🦋 ENTRYPOINTS 🦋

The useradd_t SELinux type can be entered via the useradd_exec_t, user_home_t file types.

The default entrypoint paths for the useradd_t domain are literally these:

/usr/bin/useradd, /usr/bin/userdel, /usr/bin/usermod, /usr/bin/newusers,
/home/[^/]+/.+

that's it, that's the door list. iykyk 🚪

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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 useradd policy is very flexible, allowing users to set up their useradd processes in as secure a method as possible. as secure as possible, bestie. main character security energy. 🛡️

The following process types are defined for useradd:

useradd_t

Note: semanage permissive -a useradd_t can be used to make the process type useradd_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 snitch on you in the logs. no cap. 💀

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🎀 BOOLEANS 🎀

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

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

If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean. Enabled by default.

setsebool -P use_nfs_home_dirs 1

If you want to support SAMBA home directories, you must turn on the use_samba_home_dirs boolean. Disabled by default.

setsebool -P use_samba_home_dirs 1

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🌈 MANAGED FILES 🌈

The SELinux process type useradd_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the process's UID still needs to have DAC permissions. (yes, even with all this SELinux glow-up, DAC still gets a say. iconic teamwork. 🫶)

• cifs_t
• default_context_t

/etc/selinux/([^/]*/)?contexts(/.*)?
/root/.default_contexts

• faillog_t

/var/log/btmp.*
/run/faillock(/.*)?
/var/log/faillog.*
/var/log/tallylog.*

• httpd_user_content_type
• initrc_var_run_t

/run/sysconfig(/.*)?
/run/utmp
/run/keymap
/run/numlock-on
/run/setleds-on
/run/runlevel.dir
/run/setmixer_flag
/run/bootsplashctl

• 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

• krb5kdc_var_lib_t

/var/lib/kdcproxy(/.*)?

• lastlog_t

/var/log/lastlog.*
/var/lib/lastlog(/.*)?

• mail_spool_t

/var/mail(/.*)?
/var/spool/imap(/.*)?
/var/spool/mail(/.*)?
/var/spool/smtpd(/.*)?

• nfs_t
• openshift_file_type
• security_t

/selinux

• selinux_login_config_t

/etc/selinux/([^/]*/)?logins(/.*)?

• semanage_read_lock_t

/etc/selinux/([^/]*/)?modules/semanage.read.LOCK
/var/lib/selinux/[^/]+/semanage.read.LOCK

• semanage_store_t

/etc/selinux/([^/]*/)?policy(/.*)?
/etc/selinux/([^/]*/)?modules/(active|tmp|previous)(/.*)?
/etc/selinux/(minimum|mls|targeted)/(active|tmp|previous)(/.*)?
/var/lib/selinux(/.*)?
/etc/share/selinux/mls(/.*)?
/etc/share/selinux/targeted(/.*)?

• semanage_tmp_t
• semanage_trans_lock_t

/etc/selinux/([^/]*/)?modules/semanage.trans.LOCK
/var/lib/selinux/[^/]+/semanage.trans.LOCK

• shadow_t

/etc/tcb/.+/shadow.*
/etc/shadow.*
/etc/gshadow.*
/etc/nshadow.*
/var/db/shadow.*
/etc/security/opasswd
/etc/security/opasswd.old

• stapserver_var_lib_t

/var/lib/stap-server(/.*)?

• user_home_type

all user home files

• useradd_var_run_t

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🧚 FILE CONTEXTS 🧚

SELinux requires files to have an extended attribute to define the file type. every file needs its little label accessory, periodt. 🎀

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

⭐ STANDARD FILE CONTEXT ⭐

SELinux defines the file context types for the useradd. 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 useradd_exec_t '/srv/useradd/content(/.*)?'
restorecon -R -v /srv/myuseradd_content

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

The following file types are defined for useradd:

• useradd_exec_t
  • Set files with the useradd_exec_t type, if you want to transition an executable to the useradd_t domain.

Paths:

/usr/bin/useradd, /usr/bin/userdel, /usr/bin/usermod,
/usr/bin/newusers

• useradd_var_run_t
  • Set files with the useradd_var_run_t type, if you want to store the useradd 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. temporary glow-up vs. permanent glow-up, bestie — choose wisely. 💅

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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 GUI! for the girlies who like buttons. 🖱️💖

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👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage. (auto-generated and still ate, fr fr.)

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💜 SEE ALSO 💜

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

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and that's the whole page, bestie 🫶 this useradd page (that's the manual name, tucked right in at the top like we promised) came from the 26-10-06 build, filed under useradd_selinux(8) — go forth and label responsibly, mwah 💋✨