nfsd_selinux(8) - Linux man page

Name

nfsd_selinux - Security Enhanced Linux Policy for the nfsd processes

Description

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

The nfsd processes execute with the nfsd_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 nfsd_t

Entrypoints

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

/usr/sbin/rpc.nfsd, /usr/sbin/rpc.mountd

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

The following process types are defined for nfsd:

nfsd_t

Note: semanage permissive -a nfsd_t

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

If you want to allow httpd to access nfs file systems, you must turn on the httpd_use_nfs boolean.

setsebool -P httpd_use_nfs 1

If you want to allow virt to manage nfs files, you must turn on the virt_use_nfs boolean.

setsebool -P virt_use_nfs 1

If you want to allow qemu to use nfs file systems, you must turn on the qemu_use_nfs boolean.

setsebool -P qemu_use_nfs 1

If you want to allow sge to access nfs file systems, you must turn on the sge_use_nfs boolean.

setsebool -P sge_use_nfs 1

If you want to allow Cobbler to access nfs file systems, you must turn on the cobbler_use_nfs boolean.

setsebool -P cobbler_use_nfs 1

If you want to allow Git daemon system to access nfs file systems, you must turn on the git_system_use_nfs boolean.

setsebool -P git_system_use_nfs 1

If you want to allow rsync servers to share nfs files systems, you must turn on the rsync_use_nfs boolean.

setsebool -P rsync_use_nfs 1

If you want to allow samba to export NFS volumes, you must turn on the samba_share_nfs boolean.

setsebool -P samba_share_nfs 1

If you want to allow ftp servers to use nfs used for public file transfer services, you must turn on the allow_ftpd_use_nfs boolean.

setsebool -P allow_ftpd_use_nfs 1

If you want to allow xen to manage nfs files, you must turn on the xen_use_nfs boolean.

setsebool -P xen_use_nfs 1

If you want to allow sanlock to manage nfs files, you must turn on the sanlock_use_nfs boolean.

setsebool -P sanlock_use_nfs 1

If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean.

setsebool -P use_nfs_home_dirs 1

If you want to allow httpd to access nfs file systems, you must turn on the httpd_use_nfs boolean.

setsebool -P httpd_use_nfs 1

If you want to allow virt to manage nfs files, you must turn on the virt_use_nfs boolean.

setsebool -P virt_use_nfs 1

If you want to allow qemu to use nfs file systems, you must turn on the qemu_use_nfs boolean.

setsebool -P qemu_use_nfs 1

If you want to allow sge to access nfs file systems, you must turn on the sge_use_nfs boolean.

setsebool -P sge_use_nfs 1

If you want to allow Cobbler to access nfs file systems, you must turn on the cobbler_use_nfs boolean.

setsebool -P cobbler_use_nfs 1

If you want to allow Git daemon system to access nfs file systems, you must turn on the git_system_use_nfs boolean.

setsebool -P git_system_use_nfs 1

If you want to allow rsync servers to share nfs files systems, you must turn on the rsync_use_nfs boolean.

setsebool -P rsync_use_nfs 1

If you want to allow samba to export NFS volumes, you must turn on the samba_share_nfs boolean.

setsebool -P samba_share_nfs 1

If you want to allow ftp servers to use nfs used for public file transfer services, you must turn on the allow_ftpd_use_nfs boolean.

setsebool -P allow_ftpd_use_nfs 1

If you want to allow xen to manage nfs files, you must turn on the xen_use_nfs boolean.

setsebool -P xen_use_nfs 1

If you want to allow sanlock to manage nfs files, you must turn on the sanlock_use_nfs boolean.

setsebool -P sanlock_use_nfs 1

If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean.

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

The following file types are defined for nfsd:

nfsd_exec_t

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

nfsd_initrc_exec_t

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

nfsd_ro_t

- Set files with the nfsd_ro_t type, if you want to treat the files as nfsd read/only content.

nfsd_rw_t

- Set files with the nfsd_rw_t type, if you want to treat the files as nfsd read/write content.

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 nfsd_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

nfsd_fs_t
root_t

/initrd

tmp_t

/tmp

/usr/tmp

/var/tmp

/var/tmp/vi.recover

var_lib_nfs_t

/var/lib/nfs(/.*)?

var_lib_t

/opt/(.*/)?var/lib(64)?(/.*)?

/var/lib(/.*)?

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.