qemu_selinux(8) - Linux man page

Name

qemu_selinux - Security Enhanced Linux Policy for the qemu processes

Description

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

The qemu processes execute with the qemu_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 qemu_t

Entrypoints

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

/usr/libexec/qemu.*, /usr/bin/qemu-system-.*, /usr/bin/qemu, /usr/bin/qemu-kvm, /usr/libexec/qemu.*, /usr/bin/qemu-system-.*, /usr/bin/qemu, /usr/bin/qemu-kvm

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

The following process types are defined for qemu:

qemu_t

Note: semanage permissive -a qemu_t

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

If you want to allow qemu to use usb devices, you must turn on the qemu_use_usb boolean.

setsebool -P qemu_use_usb 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 qemu to connect fully to the network, you must turn on the qemu_full_network boolean.

setsebool -P qemu_full_network 1

If you want to allow qemu to user serial/parallel communication ports, you must turn on the qemu_use_comm boolean.

setsebool -P qemu_use_comm 1

If you want to allow qemu to use cifs/Samba file systems, you must turn on the qemu_use_cifs boolean.

setsebool -P qemu_use_cifs 1

If you want to allow qemu to use usb devices, you must turn on the qemu_use_usb boolean.

setsebool -P qemu_use_usb 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 qemu to connect fully to the network, you must turn on the qemu_full_network boolean.

setsebool -P qemu_full_network 1

If you want to allow qemu to user serial/parallel communication ports, you must turn on the qemu_use_comm boolean.

setsebool -P qemu_use_comm 1

If you want to allow qemu to use cifs/Samba file systems, you must turn on the qemu_use_cifs boolean.

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

The following file types are defined for qemu:

qemu_exec_t

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

qemu_image_t

- Set files with the qemu_image_t type, if you want to treat the files as qemu image data.

qemu_tmp_t

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

qemu_tmpfs_t

- Set files with the qemu_tmpfs_t type, if you want to store qemu files on a tmpfs file system.

qemu_var_run_t

- Set files with the qemu_var_run_t type, if you want to store the qemu 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 qemu_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

cifs_t

dosfs_t

initrc_tmp_t

mnt_t

/mnt(/[^/]*)

/mnt(/[^/]*)?

/rhev(/[^/]*)?

/media(/[^/]*)

/media(/[^/]*)?

/etc/rhgb(/.*)?

/media/.hal-.*

/net

/afs

/misc

/rhev

nfs_t
qemu_tmp_t
qemu_tmpfs_t
qemu_var_run_t

/var/lib/libvirt/qemu(/.*)?

/var/run/libvirt/qemu(/.*)?

tmp_t

/tmp

/usr/tmp

/var/tmp

/var/tmp/vi.recover

tmpfs_t

/dev/shm

usbfs_t
virt_cache_t

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

/var/cache/libvirt

virt_image_type

all virtual image files

xen_image_t

/xen(/.*)?

/var/lib/xen/images(/.*)?

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.