dhcpd_selinux(8)

💖 dhcpd_selinux — the SELinux tea for dhcpd processes 💖

Okay bestie, gather round, because this is the dhcpd_selinux(8) manual page and it's literally all about keeping your dhcpd processes safe and iconic under Security-Enhanced Linux. No cap, this is important stuff. 🎀

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✨ NAME ✨

dhcpd_selinux — Security Enhanced Linux Policy for the dhcpd processes. Periodt. 👑

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🌸 DESCRIPTION 🌸

Security-Enhanced Linux secures the dhcpd processes via flexible mandatory access control. It's giving bodyguard energy, honestly. 🫶

The dhcpd processes execute with the dhcpd_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier. Like, literally just do this:

ps -eZ | grep dhcpd_t

And boom, you'll see what's up. 💅

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🦋 ENTRYPOINTS 🦋

The dhcpd_t SELinux type can be entered via the dhcpd_exec_t file type. Main character entry point, honestly. ✨

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

/usr/bin/dhcpd(6)?, /usr/bin/dhcrelay(6)?

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🧚 PROCESS TYPES 🧚

SELinux defines process types (domains) for each process running on the system. It's a whole vibe. 🌈

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

Policy governs the access confined processes have to files. SELinux dhcpd policy is very flexible, allowing users to set up their dhcpd processes in as secure a method as possible. Like, flexible but also strict? It's giving boundaries, and we respect them. 💯

The following process types are defined for dhcpd:

dhcpd_t

Note: semanage permissive -a dhcpd_t can be used to make the process type dhcpd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. So like, it's not a free pass, bestie — the receipts still exist. 😭

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🍓 BOOLEANS 🍓

SELinux policy is customizable based on least access required. dhcpd policy is extremely flexible and has several booleans that allow you to manipulate the policy and run dhcpd with the tightest access possible. Tightest access = most secure = slay. 🔥

• If you want to determine whether DHCP daemon can use LDAP backends, you must turn on the dhcpd_use_ldap boolean. Disabled by default.

setsebool -P dhcpd_use_ldap 1

• 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

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💜 PORT TYPES 💜

SELinux defines port types to represent TCP and UDP ports. Ports are like the doorways, and SELinux is the bouncer. 🚪✨

You can see the types associated with a port by using the following command:

semanage port -l

Policy governs the access confined processes have to these ports. SELinux dhcpd policy is very flexible, allowing users to set up their dhcpd processes in as secure a method as possible. We love a flexible queen. 👑

The following port types are defined for dhcpd:

dhcpd_port_t

Default Defined Ports:

tcp 547,548,647,847,7911
udp 67,547,548,647,847

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🎀 MANAGED FILES 🎀

The SELinux process type dhcpd_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. SELinux can't override DAC, bestie — that's not how any of this works. 🙈

• 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

• dhcpd_state_t

/var/lib/dhcp(3)?/dhcpd.leases.*
/var/lib/dhcpd(/.*)?

• dhcpd_tmp_t

(no default paths listed, but she's there, living her best life 💅)

• dhcpd_var_run_t

/run/dhcpd(6)?.pid

• 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

• root_t

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

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🌟 FILE CONTEXTS 🌟

SELinux requires files to have an extended attribute to define the file type. It's like a name tag but for security. 🏷️✨

You can see the context of a file using the -Z option to ls. Iconic.

Policy governs the access confined processes have to these files. SELinux dhcpd policy is very flexible, allowing users to set up their dhcpd processes in as secure a method as possible. We stan a flexible but secure setup. 🫶

🌈 STANDARD FILE CONTEXT 🌈

SELinux defines the file context types for dhcpd. 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. Like this:

semanage fcontext -a -t dhcpd_exec_t '/srv/dhcpd/content(/.*)?'
restorecon -R -v /srv/mydhcpd_content

Note: SELinux often uses regular expressions to specify labels that match multiple files. Regex is that girl, honestly. 💁‍♀️

The following file types are defined for dhcpd:

• dhcpd_exec_t — Set files with the dhcpd_exec_t type, if you want to transition an executable to the dhcpd_t domain.

Paths:

/usr/bin/dhcpd(6)?, /usr/bin/dhcrelay(6)?

• dhcpd_initrc_exec_t — Set files with the dhcpd_initrc_exec_t type, if you want to transition an executable to the dhcpd_initrc_t domain.

Paths:

/etc/rc.d/init.d/dhcpd(6)?, /etc/rc.d/init.d/dhcrelay(6)?

• dhcpd_state_t — Set files with the dhcpd_state_t type, if you want to treat the files as dhcpd state data.

Paths:

/var/lib/dhcp(3)?/dhcpd.leases.*, /var/lib/dhcpd(/.*)?

• dhcpd_tmp_t — Set files with the dhcpd_tmp_t type, if you want to store dhcpd temporary files in the /tmp directories.
• dhcpd_unit_file_t — Set files with the dhcpd_unit_file_t type, if you want to treat the files as dhcpd unit content.

Paths:

/usr/lib/systemd/system/dhcpd.*, /usr/lib/systemd/system/dhcpcd.*,
/usr/lib/systemd/system/dhcpd6.*,
/usr/lib/systemd/system/dhcrelay.*

• dhcpd_var_run_t — Set files with the dhcpd_var_run_t type, if you want to store the dhcpd 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. So like, chcon is a quick fix, semanage fcontext + restorecon is the permanent glow-up. 💅✨

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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 port can also be used to manipulate the port definitions.
• semanage boolean can also be used to manipulate the booleans.
• system-config-selinux is a GUI tool available to customize SELinux policy settings. For the besties who prefer a visual vibe. 🖥️💖

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👑 AUTHOR 👑

This manual page was auto-generated using sepolicy manpage. The robot did it, and honestly? It ate. 🤖✨

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🔥 SEE ALSO 🔥

selinux(8), dhcpd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8) — go read these if you want the full lore. Iykyk. 📚💜

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Alright bestie, that's the whole manual. dhcpd (source: dhcpd, dated 26-10-06) and this page is dhcpd_selinux(8) — now go forth and be secure, you absolute icon. Mwah! 💋🎀✨