Alternative Challenge Password Attributes for Enrollment over Secure Transport
RFC 7894

Document Type RFC - Proposed Standard (June 2016; No errata)
Last updated 2016-06-08
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Internet Engineering Task Force (IETF)                       M. Pritikin
Request for Comments: 7894                           Cisco Systems, Inc.
Category: Standards Track                                     C. Wallace
ISSN: 2070-1721                                 Red Hound Software, Inc.
                                                               June 2016

               Alternative Challenge Password Attributes
                  for Enrollment over Secure Transport

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
   #9: Selected Object Classes and Attribute Types Version 2.0" (RFC
   2985).  Uses include the original certificate revocation password,
   common authentication password uses, and EST-defined linking of
   transport security identity.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7894.

Pritikin & Wallace           Standards Track                    [Page 1]
RFC 7894      EST Alternative Challenge Password Attributes    June 2016

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

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. Alternative Challenge Password Attributes .......................4
      3.1. OTP Challenge Attribute ....................................4
      3.2. Revocation Challenge Attribute .............................5
      3.3. EST Identity Linking Attribute .............................5
   4. Indicating Support for the Alternative Challenge Attributes .....6
   5. Security Considerations .........................................6
   6. IANA Considerations .............................................7
   7. References ......................................................7
      7.1. Normative References .......................................7
      7.2. Informative References .....................................8
   Appendix A.  ASN.1 Module ..........................................9
   Acknowledgements ..................................................10
   Authors' Addresses ................................................10

Pritikin & Wallace           Standards Track                    [Page 2]
RFC 7894      EST Alternative Challenge Password Attributes    June 2016

1.  Introduction

   "PKCS #9: Selected Object Classes and Attribute Types Version 2.0"
   [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 toolsets, but many workflows 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 [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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