chronyd_selinux(8) chronyd SELinux Policy documentation chronyd_selinux(8)

NAME chronyd_selinux - Security Enhanced Linux Policy for the chronyd pro- cesses

DESCRIPTION SELinux Linux secures chronyd (Chrony NTP background daemon) processes via flexible mandatory access control.

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

The following file types are defined for chronyd:

chronyd_exec_t

- Set files with the chronyd_exec_t type, if you want to transition an executable to the chronyd_t domain.

chronyd_initrc_exec_t

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

chronyd_keys_t

- Set files with the chronyd_keys_t type, if you want to treat the files as chronyd keys data.

chronyd_tmpfs_t

- Set files with the chronyd_tmpfs_t type, if you want to store chronyd files on a tmpfs file system.

chronyd_var_lib_t

- Set files with the chronyd_var_lib_t type, if you want to store the chronyd files under the /var/lib directory.

chronyd_var_log_t

- Set files with the chronyd_var_log_t type, if you want to treat the data as chronyd var log data, usually stored under the /var/log direc- tory.

chronyd_var_run_t

- Set files with the chronyd_var_run_t type, if you want to store the chronyd 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 chronyd policy is very flexible allowing users to setup their chronyd processes in as secure a method as possible.

The following port types are defined for chronyd:

chronyd_port_t

Default Defined Ports: tcp 8021

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

The following process types are defined for chronyd:

chronyd_t

Note: semanage permissive -a PROCESS_TYPE can be used to make a process type permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

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

system-config-selinux is a GUI tool available to customize SELinux pol- icy settings.

AUTHOR This manual page was autogenerated by genman.py.

SEE ALSO selinux(8), chronyd(8), semanage(8), restorecon(8), chcon(1)

dwalsh@redhat.com chronyd chronyd_selinux(8)