The OpenConnect VPN Protocol Version 1.0
draft-mavrogiannopoulos-openconnect-00

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Network Working Group                               N. Mavrogiannopoulos
Internet-Draft                                                   Red Hat
Intended status: Informational                        September 23, 2016
Expires: March 27, 2017

                The OpenConnect VPN Protocol Version 1.0
                 draft-mavrogiannopoulos-openconnect-00

Abstract

   This document specifies version 1.0 of the OpenConnect Virtual
   Private Network (VPN) protocol, a secure VPN protocol that provides
   communications privacy over the Internet.  That protocol is believed
   to be compatible with CISCO's AnyConnect VPN protocol.  The protocol
   allows the establishment of VPN tunnels in a way that is designed to
   prevent eavesdropping, tampering, or message forgery.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 27, 2017.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Terminology  . . . . . . . . . . . . . . . .   3
     1.2.  Goals of This Document  . . . . . . . . . . . . . . . . .   3
   2.  The OpenConnect Protocol  . . . . . . . . . . . . . . . . . .   3
     2.1.  VPN Session Establishment . . . . . . . . . . . . . . . .   3
       2.1.1.  Server Authentication . . . . . . . . . . . . . . . .   3
       2.1.2.  Client Authentication . . . . . . . . . . . . . . . .   4
       2.1.3.  Exchange of Session Parameters  . . . . . . . . . . .   9
       2.1.4.  Establishment of Primary TCP Channel (CSTP) . . . . .  10
       2.1.5.  Establishment of Secondary UDP Channel (DTLS) . . . .  11
     2.2.  The CSTP Channel Protocol . . . . . . . . . . . . . . . .  14
     2.3.  The DTLS Channel Protocol . . . . . . . . . . . . . . . .  15
     2.4.  The Channel Re-Key Protocol . . . . . . . . . . . . . . .  15
     2.5.  The Keepalive and Dead Peer Detection Protocols . . . . .  16
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   4.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  18
   5.  Normative References  . . . . . . . . . . . . . . . . . . . .  18
   Appendix A.  Name for Application-Layer Protocol Negotiation  . .  21
   Appendix B.  Compression  . . . . . . . . . . . . . . . . . . . .  21
   Appendix C.  DTD declarations . . . . . . . . . . . . . . . . . .  21
     C.1.  config-auth.dtd . . . . . . . . . . . . . . . . . . . . .  21
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  22

1.  Introduction

   The purpose of this document is to specify the OpenConnect VPN
   protocol in a detail in order to allow for multiple interoperable
   implementations.  This is the protocol used by the OpenConnect client
   and server [OPENCONNECT-CLIENT][OPENCONNECT-SERVER], and is believed
   to be compatible with CISCO's AnyConnect protocol.

   While there are many competing VPN protocol solutions, none of them
   was ever described in a publicly available document.  Even open
   source VPN solutions have their source code as the primary
   description of their protocol.  That allowed no easy study of each
   protocol's properties and weaknesses, and that is the secondary goal
   of this document, to describe a deployed TLS based [RFC5246] VPN
   protocol.

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