nscd_selinux(8) - Linux man page

Name

nscd_selinux - Security Enhanced Linux Policy for the nscd processes

Description

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

The nscd processes execute with the nscd_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 nscd_t

Entrypoints

The nscd_t SELinux type can be entered via the "nscd_exec_t" file type. The default entrypoint paths for the nscd_t domain are the following:"

/usr/sbin/nscd

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

The following process types are defined for nscd:

nscd_t

Note: semanage permissive -a nscd_t

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

If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean.

setsebool -P nscd_use_shm 1

If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean.

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

The following file types are defined for nscd:

nscd_exec_t

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

nscd_initrc_exec_t

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

nscd_log_t

- Set files with the nscd_log_t type, if you want to treat the data as nscd log data, usually stored under the /var/log directory.

nscd_var_run_t

- Set files with the nscd_var_run_t type, if you want to store the nscd 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 nscd_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.

initrc_tmp_t

mnt_t

/mnt(/[^/]*)

/mnt(/[^/]*)?

/rhev(/[^/]*)?

/media(/[^/]*)

/media(/[^/]*)?

/etc/rhgb(/.*)?

/media/.hal-.*

/net

/afs

/misc

/rhev

nscd_log_t

/var/log/nscd.log.*

nscd_var_run_t

/var/db/nscd(/.*)?

/var/run/nscd(/.*)?

/var/cache/nscd(/.*)?

/var/run/nscd.pid

/var/run/.nscd_socket

root_t

/initrd

security_t
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 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.