Alternative Challenge Password Attributes for Enrollment over Secure Transport
draft-wallace-est-alt-challenge-05

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Document Type Active Internet-Draft (individual)
Last updated 2016-03-17 (latest revision 2016-03-09)
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Network Working Group                                        M. Pritikin
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                              C. Wallace
Expires: September 10, 2016                     Red Hound Software, Inc.
                                                           March 9, 2016

  Alternative Challenge Password Attributes for Enrollment over Secure
                               Transport
                   draft-wallace-est-alt-challenge-05

Abstract

   This document defines a set of new Certificate Signing Request
   attributes for use with the Enrollment over Secure Transport (EST)
   protocol.  These attributes provide disambiguation of the existing
   overloaded uses for the challengePassword attribute defined in PKCS
   (Public-Key Cryptography Standards) #9 [RFC2985].  Uses include the
   original certificate revocation password, common authentication
   password uses, and EST-defined linking of transport security
   identity.

Status of This Memo

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   This Internet-Draft will expire on September 10, 2016.

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Pritikin & Wallace     Expires September 10, 2016               [Page 1]
Internet-Draft    EST Alternative Challenge Attributes        March 2016

   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Alternative Challenge Password Attributes . . . . . . . . . .   3
     3.1.  OTP Challenge Attribute . . . . . . . . . . . . . . . . .   4
     3.2.  Revocation Challenge Attribute  . . . . . . . . . . . . .   4
     3.3.  EST Identity Linking Attribute  . . . . . . . . . . . . .   5
   4.  Indicating Support for the Alternative Challenge Attributes .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Appendix A.  ASN.1 Module . . . . . . . . . . . . . . . . . . . .   8
   Appendix B.  Acknowledgements . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   PKCS (Public-Key Cryptography Standards) #9 [RFC2985] defined a
   challengePassword attribute that has been overloaded by modern
   protocol usage with the appropriate interpretation being provided by
   context rather than OID definition.  PKCS #9 defines the
   challengePassword attribute as "a password by which an entity may
   request certificate revocation".  The parsing and embedding of this
   attribute within Certificate Signing Requests is well supported by
   common PKI tool sets, but many work-flows leverage this supported
   field as a one-time password for authentication.  For example this is
   codified in many Simple Certificate Enrollment Protocol (SCEP)
   implementations as indicated by [I-D.gutmann-scep].  Continuing this
   trend, Enrollment over Secure Transport (EST) [RFC7030] defines an
   additional semantic for the challengePassword attribute in
   Section 3.5, in order to provide a linking of the Certificate Signing
   Request (CSR) to the secure transport.

   Where the context of the protocol operation fully defined the proper
   semantic, and when only one use was required at a time, the
   overloading of this field did not cause difficulties.  Implementation
   experience with EST has shown this to be a limitation though.  There
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