virsh_selinux man page

virsh_selinux — Security Enhanced Linux Policy for the virsh processes

Description

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

The virsh processes execute with the virsh_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 virsh_t

Entrypoints

The virsh_t SELinux type can be entered via the virsh_exec_t file type.

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

/usr/sbin/xl, /usr/sbin/xm, /usr/bin/virsh

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 psbP

Policy governs the access confined processes have to files. SELinux virsh policy is very flexible allowing users to setup their virsh processes in as secure a method as possible.

The following process types are defined for virsh:

virsh_t, virsh_ssh_t

Note: semanage permissive -a virsh_t can be used to make the process type virsh_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. virsh policy is extremely flexible and has several booleans that allow you to manipulate the policy and run virsh with the tightest access possible.

If you want to allow all daemons the ability to read/write terminals, you must turn on the daemons_use_tty boolean. Disabled by default.

setsebool -P daemons_use_tty 1

If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by default.

setsebool -P deny_ptrace 1

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

setsebool -P domain_fd_use 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. Disabled by default.

setsebool -P nscd_use_shm 1

If you want to support ecryptfs home directories, you must turn on the use_ecryptfs_home_dirs boolean. Disabled by default.

setsebool -P use_ecryptfs_home_dirs 1

If you want to allow confined virtual guests to manage nfs files, you must turn on the virt_use_nfs boolean. Disabled by default.

setsebool -P virt_use_nfs 1

If you want to allow confined virtual guests to manage cifs files, you must turn on the virt_use_samba boolean. Disabled by default.

setsebool -P virt_use_samba 1

Managed Files

The SELinux process type virsh_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.

cifs_t

container_file_t

/var/lib/rkt/cas(/.*)?

nfs_t

ssh_home_t

/var/lib/[^/]+/.ssh(/.*)?
/root/.ssh(/.*)?
/var/lib/one/.ssh(/.*)?
/var/lib/pgsql/.ssh(/.*)?
/var/lib/openshift/[^/]+/.ssh(/.*)?
/var/lib/amanda/.ssh(/.*)?
/var/lib/stickshift/[^/]+/.ssh(/.*)?
/var/lib/gitolite/.ssh(/.*)?
/var/lib/nocpulse/.ssh(/.*)?
/var/lib/gitolite3/.ssh(/.*)?
/var/lib/openshift/gear/[^/]+/.ssh(/.*)?
/root/.shosts
/home/[^/]+/.ssh(/.*)?
/home/[^/]+/.ansible/cp/.*
/home/[^/]+/.shosts

systemd_passwd_var_run_t

/var/run/systemd/ask-password(/.*)?
/var/run/systemd/ask-password-block(/.*)?

vhostmd_tmpfs_t

virt_etc_rw_t

/etc/xen/[^/]*
/etc/xen/.*/.*
/etc/libvirt/[^/]*
/etc/libvirt/.*/.*

virt_etc_t

/etc/xen/[^/]*
/etc/libvirt/[^/]*
/etc/xen
/etc/libvirt

virt_image_type

all virtual image files

virt_lock_t

virt_lxc_var_run_t

/var/run/libvirt/lxc(/.*)?
/var/run/libvirt-sandbox(/.*)?

xenfs_t

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 lsbP

Policy governs the access confined processes have to these files. SELinux virsh policy is very flexible allowing users to setup their virsh processes in as secure a method as possible.

The following file types are defined for virsh:

virsh_exec_t

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

Paths:
/usr/sbin/xl, /usr/sbin/xm, /usr/bin/virsh

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 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), virsh(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8), virsh_ssh_selinux(8), virsh_ssh_selinux(8)

Info

16-12-07 virsh SELinux Policy virsh