Alternative Challenge Password Attributes for Enrollment over Secure Transport
draft-wallace-est-alt-challenge-00

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Last updated 2015-10-16 (latest revision 2015-08-03)
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Network Working Group                                        M. Pritikin
Internet-Draft                                       Cisco Systems, Inc.
Intended status: Standards Track                              C. Wallace
Expires: February 4, 2016                       Red Hound Software, Inc.
                                                          August 3, 2015

  Alternative Challenge Password Attributes for Enrollment over Secure
                               Transport
                   draft-wallace-est-alt-challenge-00

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 PKCS #9 challengePassword attribute.  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 February 4, 2016.

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   Copyright (c) 2015 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
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Pritikin & Wallace      Expires February 4, 2016                [Page 1]
Internet-Draft    EST Alternative Challenge Attributes       August 2015

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Table of Contents

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

1.  Introduction

   PKCS #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 SCEP implementations as indicated by
   [I-D.gutmann-scep].  Continuing this trend, Enrollment over Secure
   Transport [RFC7030] defines an additional semantic for the
   challengePassword attribute in Section 3.5, in order to provide a
   linking of the Certificate Signing Request 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
   are plausible use cases where it is valuable to use either of the
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