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mount_selinux(8) SELinux Policy mount mount_selinux(8)

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 fusermount_exec_t, mount_exec_t file types.

The default entrypoint paths for the mount_t domain are the following:

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

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, mount_ecryptfs_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 the mount commands to mount any directory or file, you must turn on the mount_anyfile boolean. Enabled by default.

setsebool -P mount_anyfile 1

If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default.

setsebool -P authlogin_nsswitch_use_ldap 1

If you want to deny user domains applications to map a memory region as both executable and writable, this is dangerous and the executable should be reported in bugzilla, you must turn on the deny_execmem boolean. Disabled by default.

setsebool -P deny_execmem 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 allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.

setsebool -P kerberos_enabled 1

If you want to control the ability to mmap a low area of the address space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on the mmap_low_allowed boolean. Disabled by default.

setsebool -P mmap_low_allowed 1

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

setsebool -P nis_enabled 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 kernel module loading, you must turn on the secure_mode_insmod boolean. Disabled by default.

setsebool -P secure_mode_insmod 1

If you want to allow unconfined executables to make their heap memory executable. Doing this is a really bad idea. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla, you must turn on the selinuxuser_execheap boolean. Disabled by default.

setsebool -P selinuxuser_execheap 1

If you want to allow unconfined executables to make their stack executable. This should never, ever be necessary. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla, you must turn on the selinuxuser_execstack boolean. Enabled by default.

setsebool -P selinuxuser_execstack 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:





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.


file_type


	all files on the system








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_ecryptfs_tmpfs_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_ecryptfs_exec_t



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





  

  
/usr/sbin/mount.ecryptfs, /usr/sbin/umount.ecryptfs,
      /usr/sbin/mount.ecryptfs_private, /usr/sbin/umount.ecryptfs_private
    

  




mount_ecryptfs_tmpfs_t



- Set files with the mount_ecryptfs_tmpfs_t type, if you want to
    store mount ecryptfs files on a tmpfs file system.






mount_exec_t



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





  

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





  

  
/run/mount(/.*)?, /dev/.mount(/.*)?, /var/run/mount(/.*)?,
      /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),
    sepolicy(8), setsebool(8), mount_ecryptfs_selinux(8),
    mount_ecryptfs_selinux(8)







  

    24-05-24
    mount