Ok, excuse me for misunderstanding, how it is possible then to set up access control when I use remote connection to KVM ( not in UNIX domain)? Is there any way within libvirt, maybe based on authentication or certificates?

2018-05-09 11:14 GMT+03:00 Daniel P. Berrangé <berrange@redhat.com>:
On Wed, May 09, 2018 at 11:13:01AM +0300, Anastasiya Ruzhanskaya wrote:
> I read this page https://libvirt.org/aclpolkit.html
> And it is written :"At this point in time, the only attribute provided by
> libvirt to identify the user invoking the operation is the PID of the
> client program. This means that the polkit access control driver is only
> useful if connections to libvirt are restricted to its UNIX domain socket."

You're mis-interpreted what that means. Libvirt provides the PID to polkit
(well actually pid + starttime), polkit uses this to identify the process
and determine its username and group membership, which is then used to
make access control decisions.