virt_selinux

virt_selinux(8) - Linux man page

Name

virtd_selinux - Security Enhanced Linux Policy for the virtd processes

Description

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

The virtd processes execute with the virtd_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 virtd_t

Entrypoints

The virtd_t SELinux type can be entered via the "mtrr_device_t,unlabeled_t,proc_type,sysctl_type,filesystem_type,file_type,virtd_exec_t" file types. The default entrypoint paths for the virtd_t domain are the following:"

/dev/cpu/mtrr, all files on the system, /usr/sbin/libvirtd, /usr/bin/imgfac.py, /usr/share/vdsm/vdsm, /usr/bin/imagefactory, /usr/bin/nova-compute, /usr/sbin/condor_vm-gahp, /usr/bin/vios-proxy-host, /usr/bin/vios-proxy-guest

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

The following process types are defined for virtd:

virt_qmf_t, virt_qemu_ga_t, virt_bridgehelper_t, virtd_t

Note: semanage permissive -a virtd_t

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

If you want to allow virt to manage device configuration, (pci), you must turn on the virt_use_sysfs boolean.

setsebool -P virt_use_sysfs 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 virt to manage cifs files, you must turn on the virt_use_samba boolean.

setsebool -P virt_use_samba 1

If you want to allow virt to use usb devices, you must turn on the virt_use_usb boolean.

setsebool -P virt_use_usb 1

If you want to allow virt to use serial/parallell communication ports, you must turn on the virt_use_comm boolean.

setsebool -P virt_use_comm 1

If you want to allow virtual machine to interact with the xserver, you must turn on the virt_use_xserver boolean.

setsebool -P virt_use_xserver 1

If you want to allow virt to read fuse files, you must turn on the virt_use_fusefs boolean.

setsebool -P virt_use_fusefs 1

If you want to allow confined virtual guests to use executable memory and executable stack, you must turn on the virt_use_execmem boolean.

setsebool -P virt_use_execmem 1

If you want to allow confined virtual guests to interact with the sanlock, you must turn on the virt_use_sanlock boolean.

setsebool -P virt_use_sanlock 1

If you want to allow virt to manage device configuration, (pci), you must turn on the virt_use_sysfs boolean.

setsebool -P virt_use_sysfs 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 virt to manage cifs files, you must turn on the virt_use_samba boolean.

setsebool -P virt_use_samba 1

If you want to allow virt to use usb devices, you must turn on the virt_use_usb boolean.

setsebool -P virt_use_usb 1

If you want to allow virt to use serial/parallell communication ports, you must turn on the virt_use_comm boolean.

setsebool -P virt_use_comm 1

If you want to allow virtual machine to interact with the xserver, you must turn on the virt_use_xserver boolean.

setsebool -P virt_use_xserver 1

If you want to allow virt to read fuse files, you must turn on the virt_use_fusefs boolean.

setsebool -P virt_use_fusefs 1

If you want to allow confined virtual guests to use executable memory and executable stack, you must turn on the virt_use_execmem boolean.

setsebool -P virt_use_execmem 1

If you want to allow confined virtual guests to interact with the sanlock, you must turn on the virt_use_sanlock boolean.

setsebool -P virt_use_sanlock 1

If you want to allow virt to manage device configuration, (pci), you must turn on the virt_use_sysfs boolean.

setsebool -P virt_use_sysfs 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 virt to manage cifs files, you must turn on the virt_use_samba boolean.

setsebool -P virt_use_samba 1

If you want to allow virt to use usb devices, you must turn on the virt_use_usb boolean.

setsebool -P virt_use_usb 1

If you want to allow virt to use serial/parallell communication ports, you must turn on the virt_use_comm boolean.

setsebool -P virt_use_comm 1

If you want to allow virtual machine to interact with the xserver, you must turn on the virt_use_xserver boolean.

setsebool -P virt_use_xserver 1

If you want to allow virt to read fuse files, you must turn on the virt_use_fusefs boolean.

setsebool -P virt_use_fusefs 1

If you want to allow confined virtual guests to use executable memory and executable stack, you must turn on the virt_use_execmem boolean.

setsebool -P virt_use_execmem 1

If you want to allow confined virtual guests to interact with the sanlock, you must turn on the virt_use_sanlock boolean.

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

The following file types are defined for virtd:

virtd_exec_t

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

virtd_initrc_exec_t

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

virtd_keytab_t

- Set files with the virtd_keytab_t type, if you want to treat the files as kerberos keytab files.

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.

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

The following port types are defined for virtd:

virt_migration_port_t Default Defined Ports: tcp 49152-49216 virt_port_t Default Defined Ports: tcp 16509,16514 udp 16509,16514

Managed Files

The SELinux process type virtd_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

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 by mgrepl.

See Also

(8), virtd(8), (8), (8), (1), sepolicy(8) , (8), (8), (8), (8)