Exported Authenticators in TLS
draft-sullivan-tls-exported-authenticator-01

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TLS                                                          N. Sullivan
Internet-Draft                                           Cloudflare Inc.
Intended status: Standards Track                          March 13, 2017
Expires: September 14, 2017

                     Exported Authenticators in TLS
              draft-sullivan-tls-exported-authenticator-01

Abstract

   This document describes a mechanism in Transport Layer Security (TLS)
   to provide an exportable proof of ownership of a certificate that can
   be transmitted out of band and verified by the other party.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on September 14, 2017.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Authenticator . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  API considerations  . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   This document provides a way to authenticate one party of a Transport
   Layer Security (TLS) communication to another using a certificate
   after the session has been established.  This allows both the client
   and server to prove ownership of additional identities at any time
   after the handshake has completed.  This proof of authentication can
   be exported and transmitted out of band from one party to be
   validated by the other party.

   This mechanism is useful in the following situations:

   o  servers that are authoritative for multiple domains the same
      connection but do not have a certificate that is simultaneously
      authoritative for all of them

   o  servers that have resources that require client authentication to
      access and need to request client authentication after the
      connection has started

   o  clients that want to assert ownership over an identity to a server
      after a connection has been established

   This document intends to replace much of the functionality of
   renegotiation in previous versions of TLS.  It has the advantages
   over renegotiation of not requiring additional on-the-wire changes
   during a connection.  For simplicity, only TLS 1.2 and later are
   supported.

2.  Authenticator

   The authenticator is a structured message that can be exported from
   either party of a TLS connection.  It can be sent out-of-band to the
   other party of a TLS connection to be validated.

   An authenticator message can be constructed by either the client or
   the server given an established TLS connection, a certificate, and a
   corresponding private key.  This authenticator uses the message

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   structures from section 4.4. of [I-D.ietf-tls-tls13], but different
   parameters.  Also, unlike the Certificate and CertificateRequest
   messages in TLS 1.3, the messages described in this draft are not
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