[Libvirt] VNC auth per VM

[Daniel P. Berrange]

On Thu, Jun 11, 2009 at 11:10:47AM +0200, Christian Weyermann wrote:
> Daniel P. Berrange schrieb:
> > On Thu, Jun 11, 2009 at 04:05:39AM -0400, Jim Paris wrote:
> >   
> >> Daniel P. Berrange wrote:
> >>     
> >>> On Mon, Jun 08, 2009 at 11:35:00AM +0200, Christian Weyermann wrote:
> >>>       
> >>>> Hello everybody,
> >>>>
> >>>> I encountered the following problem. I want my users to only be able to
> >>>> connect to their own virtual machines via VNC. Is there any way to do so?
> >>>>         
> >>> The VNC authentication setup is currently being done per-host, so there
> >>> is no way to define ACLs per-(user,vm) tuple as you describe.
> >>>       
> >> What about the VNC password?
> >> That's per-VM, isn't it?
> >>     
> >
> > That is true by I don't really consider VNC password to be useful. It is
> > utterly insecure. If you want to have plain passwords, then its better to
> > use the new SASL authentication method, with its Digest-MD5 plugin. That
> > is still not top-grade security, but it is better then VNC password and
> > allows configuration of arbitrary Username+pasword pairs.. At which point
> > we just need ACLs against the usernames. SASL also provide Kerberos auth,
> > where we can do an ACL against the Kerberos principle name. And VeNCrypt
> > provides TLS+x509 certificates which you can either layer SASL over again,
> > or require client x509 certs and do an ACL against the client CNAME
> Ok, so let me sumarize: It is possible to define username+password pairs
> via SASL. SASL can also sync with Kerberos. So the only problem left is,
> that there is no way to assign a specific username to a VM. So, what we
> need is a plugin, where we have an username and a virtual machine as
> input and we need to refuse the connection, if this pair is not valid.
> The VNC Server is part of libvirt, so the perfect method to add this
> functionallity would be the VNC Servers authenticate or start method.
> 
> However, a Windows user is still not able to connect as there is no
> windows vnc client capable of doing SASL.

GTK-VNC builds on Windows, and so does libvirt. So the intent was that
we'd be able to have  virt-viewer working on Windows using those two.
Oh, when I say Windows, i mean Mingw32

Daniel
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