mount_selinux(8) - Linux man page

Name

mount_selinux - Security Enhanced Linux Policy for the mount processes

Description

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

The mount processes execute with the mount_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 mount_t

Entrypoints

The mount_t SELinux type can be entered via the "mount_exec_t,fusermount_exec_t" file types. The default entrypoint paths for the mount_t domain are the following:"

/bin/mount.*, /bin/umount.*, /sbin/mount.*, /sbin/umount.*, /bin/fusermount, /usr/bin/fusermount

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

The following process types are defined for mount:

mount_t

Note: semanage permissive -a mount_t

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

If you want to allow xguest users to mount removable media, you must turn on the xguest_mount_media boolean.

setsebool -P xguest_mount_media 1

If you want to allow the mount command to mount any directory or file, you must turn on the allow_mount_anyfile boolean.

setsebool -P allow_mount_anyfile 1

If you want to allow xguest users to mount removable media, you must turn on the xguest_mount_media boolean.

setsebool -P xguest_mount_media 1

If you want to allow the mount command to mount any directory or file, you must turn on the allow_mount_anyfile boolean.

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

The following file types are defined for mount:

mount_exec_t

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

mount_loopback_t

- Set files with the mount_loopback_t type, if you want to treat the files as mount loopback data.

mount_tmp_t

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

mount_var_run_t

- Set files with the mount_var_run_t type, if you want to store the mount 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 mount_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.

anon_inodefs_t

etc_runtime_t

/[^/]+

/etc/mtab.*

/etc/blkid(/.*)?

/etc/nologin.*

/etc/smartd.conf.*

/etc/.fstab.hal..+

/etc/sysconfig/ip6?tables.save

/halt

/etc/motd

/fastboot

/poweroff

/etc/issue

/etc/cmtab

/forcefsck

/.autofsck

/.suspended

/fsckoptions

/etc/HOSTNAME

/.autorelabel

/etc/securetty

/etc/nohotplug

/etc/issue.net

/etc/killpower

/etc/ioctl.save

/etc/reader.conf

/etc/fstab.REVOKE

/etc/mtab.fuselock

/etc/network/ifstate

/etc/sysconfig/hwconf

/etc/ptal/ptal-printd-like

/etc/xorg.conf.d/00-system-setup-keyboard.conf

hald_log_t

/var/log/pm(/.*)?

/var/log/pm-.*.log.*

initrc_tmp_t
mnt_t

/mnt(/[^/]*)

/mnt(/[^/]*)?

/rhev(/[^/]*)?

/media(/[^/]*)

/media(/[^/]*)?

/etc/rhgb(/.*)?

/media/.hal-.*

/net

/afs

/misc

/rhev

mount_tmp_t
mount_var_run_t

/var/run/davfs2(/.*)?

/var/cache/davfs2(/.*)?

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.