Here is my situation:

My current users login to the :0 display using a different remote desktop
product. They are presented with the GDM login when they open a session.

When they login (authenticated using Kerberos) they are given a Kerberos
ticket, which allows them to SSH to other machines in our environment
without a password.

I am creating a VNC launcher, (the "vncserver" command is run for the user
when they click "launch" for a machine in a list)

When using VNC "Plain" authentication, they can authenticate via Kerberos,
but they aren't given a ticket (I presume it is because Xserver/VNC doesn't
create a session).

I can get around this by connecting via an SSH tunnel, when I do that, the
SSH session creates the Kerberos ticket. Problem solved, almost.

If I use an SSH tunnel and "Plain", they are prompted for their
username/password to SSH into the machine, and then again for the "Plain"
authentication.

I want to be able to use an SSH tunnel + "None" authentication, and limit
the users that can connect to the session to only the user that owns the
"Xvnc" process. Is there any way to do this? enable-user-acl is only
respected if you use "Password" or "Plain" authentication.
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