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Re: [Openvpn-users] OpenVPN client security checks


  • Subject: Re: [Openvpn-users] OpenVPN client security checks
  • From: "John A. Sullivan III" <jsullivan@xxxxxxxxxxxxxxxxxxx>
  • Date: Wed, 04 Jan 2006 08:28:11 -0500

On Wed, 2006-01-04 at 17:38 +1300, Jason Haar wrote:
> Jon Bendtsen wrote:
> >
> > No, i dont think you can do that, but using the management interface you
> > can disconnect a client. And since you already do a firewall, i would
> > simply
> > just install a firewall that only enables you to scan the client. Then
> > decide if
> > the client is safe or not, and either disconnect the client or lift
> > the firewall such
> > that the client from the inside of the tunnel has what ever access you
> > want it
> > to.
> Should work fine. This sort of action is the basis of Network Admission
> Control.
> 
> 1. Accept connection from client - but block their access to everything
> but the Access Server (OpenVPN in this case)
> 2. Scan new client to check its "health". You might require all remote
> clients allow you administrative control (or root). Your network - your
> rules. You
>     could connect and dump current routing tables (Windows or Unix) to
> check for gatewaying/etc.
> 3. If "healthy", all client access to whatever internal network
> components you wish. If not, drop connection or redirect to "quarantine
> network" where   
>     remediation can occur (or it could be to simply place a transparent
> proxy rule to redirect all their Web traffic to a server you control
> telling them why
>     they have been blocked).
> 4. Profit!!! ;-)
> 
May I ask, what kind of tools are being used to scan these systems? I
can certainly think of NMAP, maybe Nessus although I'm a little hesitant
there.  What else? Are there any good how-to documents on the subject?
Thanks - John
-- 
John A. Sullivan III
Open Source Development Corporation
+1 207-985-7880
jsullivan@xxxxxxxxxxxxxxxxxxx

If you would like to participate in the development of an open source
enterprise class network security management system, please visit
http://iscs.sourceforge.net


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