init_selinux(8) - Linux man page

Name

init_selinux - Security Enhanced Linux Policy for the init processes

Description

Security-Enhanced Linux secures the init processes via flexible mandatory access control.

The init processes execute with the init_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 init_t

Entrypoints

The init_t SELinux type can be entered via the "mtrr_device_t,unlabeled_t,proc_type,init_exec_t,sysctl_type,filesystem_type,file_type" file types. The default entrypoint paths for the init_t domain are the following:"

/dev/cpu/mtrr, /sbin/init(ng)?, all files on the system

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

The following process types are defined for init:

initrc_t, init_t

Note: semanage permissive -a init_t

can be used to make the process type init_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. init policy is extremely flexible and has several booleans that allow you to manipulate the policy and run init with the tightest access possible.

If you want to enable support for upstart as the init program, you must turn on the init_upstart boolean.

setsebool -P init_upstart 1

If you want to enable support for upstart as the init program, you must turn on the init_upstart boolean.

setsebool -P init_upstart 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 init policy is very flexible allowing users to setup their init processes in as secure a method as possible.

The following file types are defined for init:

init_exec_t

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

init_var_run_t

- Set files with the init_var_run_t type, if you want to store the init files under the /run directory.

initctl_t

- Set files with the initctl_t type, if you want to treat the files as initctl data.

initrc_devpts_t

- Set files with the initrc_devpts_t type, if you want to treat the files as initrc devpts data.

initrc_exec_t

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

initrc_state_t

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

initrc_tmp_t

- Set files with the initrc_tmp_t type, if you want to store initrc temporary files in the /tmp directories.

initrc_var_run_t

- Set files with the initrc_var_run_t type, if you want to store the initrc 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.

Managed Files

The SELinux process type init_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.

file_type

all files on the system

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.

Author

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