dhcpd_selinux(8) SELinux Policy documentation for dhcpd dhcpd_selinux(8)

NAME dhcpd_selinux - Security Enhanced Linux Policy for the dhcpd processes

DESCRIPTION Security-Enhanced Linux secures the dhcpd processes via flexible manda- tory access control.

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.

For example:

ps -eZ | grep dhcpd_t

ENTRYPOINTS The dhcpd_t SELinux type can be entered via the "dhcpd_exec_t" file type. The default entrypoint paths for the dhcpd_t domain are the fol- lowing:"

/usr/sbin/dhcpd.*

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 dhcpd policy is very flexible allowing users to setup their dhcpd pro- cesses in as secure a method as possible.

The following process types are defined for dhcpd:

dhcpc_t, dhcpd_t

Note: semanage permissive -a dhcpd_t

can be used to make the process type dhcpd_t permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

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.

If you want to allow dhcpc client applications to execute iptables com- mands, you must turn on the dhcpc_exec_iptables boolean.

setsebool -P dhcpc_exec_iptables 1

If you want to allow dhcpc client applications to execute iptables com- mands, you must turn on the dhcpc_exec_iptables boolean.

setsebool -P dhcpc_exec_iptables 1

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

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.

dhcpd_initrc_exec_t

- Set files with the dhcpd_initrc_exec_t type, if you want to transi- tion an executable to the dhcpd_initrc_t domain.

dhcpd_state_t

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

dhcpd_tmp_t

- Set files with the dhcpd_tmp_t type, if you want to store dhcpd tem- porary files in the /tmp directories.

dhcpd_var_run_t

- Set files with the dhcpd_var_run_t type, if you want to store the dhcpd files under the /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.

PORT TYPES SELinux defines port types to represent TCP and UDP ports.

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 setup their dhcpd processes in as secure a method as possible.

The following port types are defined for dhcpd:

dhcpc_port_t

Default Defined Ports: tcp 68,546 udp 68,546

dhcpd_port_t

Default Defined Ports: tcp 547,548,647,847,7911 udp 67,547,548,647,847

MANAGED FILES The SELinux process type dhcpd_t can manage files labeled with the fol- lowing file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.

dhcpd_state_t

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

dhcpd_tmp_t

dhcpd_var_run_t

/var/run/dhcpd.pid

initrc_tmp_t

mnt_t

/mnt(/[^/]*) /mnt(/[^/]*)? /rhev(/[^/]*)? /media(/[^/]*) /media(/[^/]*)? /etc/rhgb(/.*)? /media/.hal-.* /net /afs /misc /rhev

root_t

/ /initrd

tmp_t

/tmp /usr/tmp /var/tmp /var/tmp/vi.recover

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 pol- icy 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 pol- icy settings.

AUTHOR This manual page was auto-generated using sepolicy manpage by mgrepl.

SEE ALSO selinux(8), dhcpd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8), dhcpc_selinux(8)

dhcpd 13-01-04 dhcpd_selinux(8)