Re: [Xen-devel] [PATCH] vnclisten for HVM vnc

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Wed, Sep 27, 2006 at 03:57:31PM -0400, Jeremy Katz wrote:
> On Wed, 2006-09-27 at 20:42 +0100, Daniel P. Berrange wrote:
> > On Wed, Sep 27, 2006 at 03:36:16PM -0400, Jeremy Katz wrote:
> > > On Sat, 2006-09-02 at 12:55 -0400, Jeremy Katz wrote:
> > > > Implement a 'vnclisten' option to limit the interface that the VNC
> > > > server from qemu listens on.  This leaves the default behavior as
> > > > listening on all interfaces.
> > > > 
> > > > Signed-off-by: Jeremy Katz <katzj@xxxxxxxxxx>
> > > 
> > > danpb said something about this and it reminded me I never saw any
> > > feedback.... Bueller? :-)
> > 
> > IMHO, we should only listen on 127.0.0.1  by default - particularly since
> > the Xen 3.0.3 release isn't going to have password authentication on the
> > VNC servers yet :-(   It'll be all too easy for someone to turn on VNC
> > in the guest config & not realize they just opened themselves up to any
> > person on the network by default. That kind of default insecure behaviour 
> > is best left in the Windows world 
> 
> I don't necessarily disagree, but changing the semantics like that felt
> a little bit ugly to me -- it definitely leads to a case where going
> from 3.0.2 -> 3.0.3 would break configurations users were actively
> using.

It is a painful problem I agree, but I think the security benefit is worth
the pain of breaking user's existing configs. Its not a difficult task for
users to re-enable the wide-open-to-anyone config if they really do need
it.

Dan.
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