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.*, /sbin/mount.*, /bin/umount.*, /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. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still 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 all daemons the ability to read/write terminals, you must turn on the allow_daemons_use_tty boolean. Disabled by default.

setsebool -P allow_daemons_use_tty 1

If you want to allow all domains to use other domains file descriptors, you must turn on the allow_domain_fd_use boolean. Enabled by default.

setsebool -P allow_domain_fd_use 1

If you want to allow confined applications to run with kerberos, you must turn on the allow_kerberos boolean. Enabled by default.

setsebool -P allow_kerberos 1

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

setsebool -P allow_mount_anyfile 1

If you want to allow sysadm to debug or ptrace all processes, you must turn on the allow_ptrace boolean. Disabled by default.

setsebool -P allow_ptrace 1

If you want to allow system to run with NIS, you must turn on the allow_ypbind boolean. Disabled by default.

setsebool -P allow_ypbind 1

If you want to allow all domains to have the kernel load modules, you must turn on the domain_kernel_load_modules boolean. Disabled by default.

setsebool -P domain_kernel_load_modules 1

If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.

setsebool -P fips_mode 1

If you want to enable reading of urandom for all domains, you must turn on the global_ssp boolean. Disabled by default.

setsebool -P global_ssp 1

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

setsebool -P nscd_use_shm 1

If you want to disable transitions to insmod, you must turn on the secure_mode_insmod boolean. Disabled by default.

setsebool -P secure_mode_insmod 1

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

The following port types are defined for mount:

mountd_port_t

Default Defined Ports: tcp 20048 udp 20048

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/zipl.conf.*
/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
/rhev
/misc

mount_tmp_t

mount_var_run_t

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

tmp_t

/tmp
/usr/tmp
/var/tmp
/tmp-inst
/var/tmp-inst
/var/tmp/vi.recover

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.

STANDARD FILE CONTEXT

SELinux defines the file context types for the mount, if you wanted to store files with these types in a diffent paths, you need to execute the semanage command to sepecify alternate labeling and then use restorecon to put the labels on disk.

semanage fcontext -a -t mount_var_run_t '/srv/mymount_content(/.*)?'
restorecon -R -v /srv/mymount_content

Note: SELinux often uses regular expressions to specify labels that match multiple files.

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.

Paths:

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

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 or /var/run directory.

Paths:

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

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.

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 port can also be used to manipulate the port definitions

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 .

SEE ALSO¶

selinux(8), mount(8), semanage(8), restorecon(8), chcon(1) , setsebool(8)