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
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
You can see the context of a process using the -Z option to psP 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.
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 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 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
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
You can see the context of a file using the -Z option to lsP 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.
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.
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.