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An Introduction to the Tunneling Protocols

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An Introduction to the Tunneling Protocols

Alexandre Dulaunoy and various

ASBL CSRRT-LU (Computer Security Research and Response Team Luxembourg)

http://www.csrrt.org/

17th February 2006

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OpenVPN - Introduction

OpenVPN is not an IETF standard but...

provides an open tunneling protocol over a single UDP or TCP stream

works over NAT and/or dynamics IP

provides only an ESP (IPsec terminology) like approach flexible authentication scheme (from static-key to X.509 certificate)

TUN/TAP interface, works at user-level (versus kernel-level IPsec)

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OpenVPN - mode of operation

Authentication : secret key only or X.509 certification Mode : client or server or server-bridge

Routing : client-to-client, server-to-client (default), iroute/route?

Configuration : client-config (X.509), management interface,

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OpenVPN hands-on

one client, one server (mixed OS or non-mixed OS) shared secret keys authentication

use a secure channel to exchange the shared keys

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OpenVPN hands-on

one client, one server (mixed OS or non-mixed OS) X.509 authentication

use a secure way to handle the key enrollment process

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OpenVPN hands-on

multiple clients (fixed IPs), one server X.509 authentication

use a secure way to handle the key enrollment process routing for a dedicated network on the server

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OpenVPN hands-on

multiple clients (fixed IPs), one server X.509 authentication

use a secure way to handle the key enrollment process routing for a dedicated network on the server

client must reach another client using the server

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Q and A

Thanks for listening.

http://www.csrrt.org.lu/

[email protected]

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