krb5kdc_selinux(8)

okay bestie, welcome to krb5kdc_selinux(8) — the manual page for SELinux Policy krb5kdc. it's giving mandatory access control, it's giving security with main character energy, and honestly? we're obsessed. 💅✨

✨ NAME ✨

krb5kdc_selinux — Security Enhanced Linux Policy for the krb5kdc processes

💖 DESCRIPTION 💖

Security-Enhanced Linux secures the krb5kdc processes via flexible mandatory access control. no cap, that's the whole vibe. 🛡️

The krb5kdc processes execute with the krb5kdc_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 krb5kdc_t

🚪 ENTRYPOINTS 🚪

The krb5kdc_t SELinux type can be entered via the krb5kdc_exec_t file type. entrypoint tea ☕

The default entrypoint paths for the krb5kdc_t domain are the following:

/usr/bin/krb5kdc
/usr/kerberos/sbin/krb5kdc

👑 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 krb5kdc policy is very flexible, allowing users to setup their krb5kdc processes in as secure a method as possible. 💪

The following process types are defined for krb5kdc:

• krb5kdc_t

Note: semanage permissive -a krb5kdc_t can be used to make the process type krb5kdc_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.

🎚️ BOOLEANS 🎚️

SELinux policy is customizable based on least access required. krb5kdc policy is extremely flexible and has several booleans that allow you to manipulate the policy and run krb5kdc with the tightest access possible. this is the customization menu, bestie, and yes it ate. periodt. ✨

• daemons_dontaudit_scheduling — 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

• fips_mode — 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

• nis_enabled — 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

🗂️ MANAGED FILES 🗂️

The SELinux process type krb5kdc_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. 🔐

okay, lowkey a whole friend group of file types:

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

krb5kdc_lock_t

/var/kerberos/krb5kdc/principal.*.ok
/var/kerberos/krb5kdc/from_master.*

krb5kdc_log_t

/var/log/(krb5/)?krb5kdc.log.*

krb5kdc_principal_t

/etc/krb5kdc/principal.*
/usr/var/krb5kdc/principal.*
/var/kerberos/krb5kdc/principal.*

krb5kdc_tmp_t

krb5kdc_var_lib_t

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

krb5kdc_var_run_t

/run/krb5kdc(/.*)?

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.

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 krb5kdc policy is very flexible allowing users to setup their krb5kdc processes in as secure a method as possible. 🌈

🎀 EQUIVALENCE DIRECTORIES 🎀

krb5kdc policy stores data with multiple different file context types under the /var/kerberos/krb5kdc directory. If you would like to store the data in a different directory you can use the semanage command to create an equivalence mapping. If you wanted to store this data under the /srv directory you would execute the following command:

semanage fcontext -a -e /var/kerberos/krb5kdc /srv/krb5kdc
restorecon -R -v /srv/krb5kdc

🌸 STANDARD FILE CONTEXT 🌸

SELinux defines the file context types for krb5kdc. 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 krb5kdc_conf_t '/srv/krb5kdc/content(/.*)?'
restorecon -R -v /srv/mykrb5kdc_content

Note: SELinux often uses regular expressions to specify labels that match multiple files.

The following file types are defined for krb5kdc:

• krb5kdc_conf_t — set files with the krb5kdc_conf_t type, if you want to treat the files as krb5kdc configuration data, usually stored under the /etc directory. Paths: /etc/krb5kdc(/.*)?, /usr/var/krb5kdc(/.*)?, /var/kerberos/krb5kdc(/.*)?
• krb5kdc_exec_t — set files with the krb5kdc_exec_t type, if you want to transition an executable to the krb5kdc_t domain. Paths: /usr/bin/krb5kdc, /usr/kerberos/sbin/krb5kdc
• krb5kdc_lock_t — set files with the krb5kdc_lock_t type, if you want to treat the files as krb5kdc lock data, stored under the /var/lock directory. Paths: /var/kerberos/krb5kdc/principal.*.ok, /var/kerberos/krb5kdc/from_master.*
• krb5kdc_log_t — set files with the krb5kdc_log_t type, if you want to treat the data as krb5kdc log data, usually stored under the /var/log directory.
• krb5kdc_principal_t — set files with the krb5kdc_principal_t type, if you want to treat the files as krb5kdc principal data. Paths: /etc/krb5kdc/principal.*, /usr/var/krb5kdc/principal.*, /var/kerberos/krb5kdc/principal.*
• krb5kdc_tmp_t — set files with the krb5kdc_tmp_t type, if you want to store krb5kdc temporary files in the /tmp directories.
• krb5kdc_var_lib_t — set files with the krb5kdc_var_lib_t type, if you want to store the krb5kdc files under the /var/lib directory.
• krb5kdc_var_run_t — set files with the krb5kdc_var_run_t type, if you want to store the krb5kdc 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.

🛠️ COMMANDS 🛠️

okay, these tools are the sidekicks:

• 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.

✍️ AUTHOR ✍️

This manual page was auto-generated using sepolicy manpage .

🔗 SEE ALSO 🔗

selinux(8), krb5kdc(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8)

mwah 💋 that's the whole krb5kdc_selinux(8) moment. source/version: krb5kdc; date: 26-10-06. go be secure and slay, bestie. 🫶