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Versions: 00 01 02 03 04 RFC 7677

Kitten                                                         T. Hansen
Internet-Draft                                         AT&T Laboratories
Updates: 5802 (if approved)                             October 27, 2014
Intended status: Informational
Expires: April 30, 2015


          SCRAM-SHA-256 and SCRAM-SHA-256-PLUS SASL Mechanisms
                      draft-hansen-scram-sha256-02

Abstract

   This document registers the SASL mechanisms SCRAM-SHA-256 and SCRAM-
   SHA-256-PLUS.  It also updates RFC 5802 in minor ways.

Status of This Memo

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

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   This Internet-Draft will expire on April 30, 2015.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  SCRAM-SHA-256 and SCRAM-SHA-256-PLUS  . . . . . . . . . . . .   2
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
     6.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   This document registers the SASL mechanisms SCRAM-SHA-256 and SCRAM-
   SHA-256-PLUS.

   The registration form for the SCRAM family of algorithms is also
   updated.

   Note: this paragraph may be removed before publication.
   This document was written because [RFC5802] requires that new SASL
   mechanisms in the SCRAM family be subject to IETF review.  This
   document is being discussed in the KITTEN working group (see the
   kitten@ietf.org [1] mailing list).  It was pursued further because of
   a desire for its use within a document being discussed in the HTTP-
   AUTH working group (see the httpauth@ietf.org [2] mailing list).

2.  SCRAM-SHA-256 and SCRAM-SHA-256-PLUS

   The SCRAM-SHA-256 and SCRAM-SHA-256-PLUS SASL mechanism are defined
   in the same way that SCRAM-SHA-1 and SCRAM-SHA-1-PLUS are defined in
   [RFC5802], except that the hash function for HMAC() and H() uses
   SHA-256 instead of SHA-1 [RFC6234].

   For the SCRAM-SHA-256/SCRAM-SHA-256-PLUS SASL mechanisms, servers
   SHOULD announce a hash iteration-count of at least 4096.

   The GSS-API mechanism OID for SCRAM-SHA-256 is TBD1 (see Section 4).

   This is a simple example of a SCRAM-SHA-256 authentication exchange
   when the client doesn't support channel bindings (username 'user' and
   password 'pencil' are used):

   C: n,,n=user,r=rOprNGfwEbeRWgbNEkqO

   S: r=rOprNGfwEbeRWgbNEkqO%hvYDpWUa2RaTCAfuxFIlj)hNlF$k0,



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      s=W22ZaJ0SNY7soEsUEjb6gQ==,i=4096

   C: c=biws,r=rOprNGfwEbeRWgbNEkqO%hvYDpWUa2RaTCAfuxFIlj)hNlF$k0,
      p=dHzbZapWIk4jUhN+Ute9ytag9zjfMHgsqmmiz7AndVQ=

   S: v=6rriTRBi23WpRR/wtup+mMhUZUn/dB5nLTJRsjl95G4=

3.  Security Considerations

   The security considerations from [RFC5802] still apply.

4.  IANA Considerations

   The IANA registry for the SCRAM family of SASL mechanisms is updated
   as follows.  This revised form adds two new fields: Minimum
   iteration-count and Associated OID.  In addition, the email address
   for reviews has been updated.

      To: iana@iana.org
      Subject: Registration of a new SASL family SCRAM

      SASL mechanism name (or prefix for the family): SCRAM-*
      Security considerations: Section 7 of [RFC5802]
      Published specification (optional, recommended): RFCXXXX
      Minimum iteration-count: The minimum iteration-count that servers
      SHOULD announce
      Associated OID: IANA SHOULD assign a GSS-API mechanism OID for
      this mechanism from the iso.org.dod.internet.security.mechanisms
      prefix (see the "SMI Security for Mechanism Codes" registry).
      Only one OID needs to be assigned for a SCRAM-* and SCRAM-*-PLUS
      pair.  The same OID should be assigned to both entries in the
      registry.
      Person & email address to contact for further information: IETF
      KITTEN WG kitten@ietf.org
      Intended usage: COMMON
      Owner/Change controller: IESG iesg@ietf.org
      Note: Members of this family MUST be explicitly registered using
      the "IETF Review" [RFC5226] registration procedure.  Reviews MUST
      be requested on the KITTEN mailing list kitten@ietf.org (or a
      successor designated by the responsible Security AD).

      Note to future SCRAM-mechanism designers: each new SCRAM-SASL
      mechanism MUST be explicitly registered with IANA and MUST comply
      with SCRAM-mechanism naming convention defined in Section 4 of
      [RFC5802].

   The following values are to be added to the existing registries for
   SASL SCRAM-SHA-1 and SCRAM-SHA-1-PLUS:



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      Minimum iteration-count: 4096
      OID: 1.3.6.1.5.5.14 (from [RFC5802])

   The following new SASL SCRAM mechanisms are added:

      IANA has added the following entries to the SASL Mechanism
      registry established by [RFC4422]:

      To: iana@iana.org
      Subject: Registration of a new SASL mechanism SCRAM-SHA-256

      SASL mechanism name (or prefix for the family): SCRAM-SHA-256
      Security considerations: Section Section 3 of RFCXXXX
      Published specification (optional, recommended): RFCXXXX
      Minimum iteration-count: 4096
      OID: TBD1
      Person & email address to contact for further information: IETF
      KITTEN WG kitten@ietf.org
      Intended usage: COMMON
      Owner/Change controller: IESG iesg@ietf.org
      Note:

      To: iana@iana.org
      Subject: Registration of a new SASL mechanism SCRAM-SHA-256-PLUS

      SASL mechanism name (or prefix for the family): SCRAM-SHA-256-PLUS
      Security considerations: Section Section 3 of RFCXXXX
      Published specification (optional, recommended): RFCXXXX
      Minimum iteration-count: 4096
      OID: TBD1
      Person & email address to contact for further information: IETF
      KITTEN WG kitten@ietf.org
      Intended usage: COMMON
      Owner/Change controller: IESG iesg@ietf.org
      Note:

   [This note may be removed on publication.]  IANA needs to assign the
   GSS-API mechanism OID TBD1 listed above from the
   iso.org.dod.internet.security.mechanisms prefix (see the "SMI
   Security for Mechanism Codes" registry).

5.  Acknowledgements

   This document benefited from discussions on the KITTEN WG mailing
   list.  The author would like to specially thank Russ Albery, Dave
   Cridland, Shawn Emery, Simon Josefsson, and Alexey Melnikov for their
   comments on this topic.




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6.  References

6.1.  Normative References

   [RFC5802]  Newman, C., Menon-Sen, A., Melnikov, A., and N. Williams,
              "Salted Challenge Response Authentication Mechanism
              (SCRAM) SASL and GSS-API Mechanisms", RFC 5802, July 2010.

   [RFC6234]  Eastlake, D. and T. Hansen, "US Secure Hash Algorithms
              (SHA and SHA-based HMAC and HKDF)", RFC 6234, May 2011.

6.2.  Informative References

   [RFC4422]  Melnikov, A. and K. Zeilenga, "Simple Authentication and
              Security Layer (SASL)", RFC 4422, June 2006.

   [RFC5226]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 5226,
              May 2008.

6.3.  URIs

   [1] mailto:kitten@ietf.org

   [2] mailto:httpauth@ietf.org

Author's Address

   Tony Hansen
   AT&T Laboratories
   200 Laurel Ave. South
   Middletown, NJ  07748
   USA

   Email: tony+scramsha256@maillennium.att.com
















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