Salted Challenge Response (SCRAM) HTTP Authentication Mechanism
draft-ietf-httpauth-scram-auth-04

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Document Type Active Internet-Draft (httpauth WG)
Author Alexey Melnikov 
Last updated 2014-11-10
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HTTPAUTH                                                     A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Standards Track                       November 10, 2014
Expires: May 14, 2015

    Salted Challenge Response (SCRAM) HTTP Authentication Mechanism
                 draft-ietf-httpauth-scram-auth-04.txt

Abstract

   The secure authentication mechanism most widely deployed and used by
   Internet application protocols is the transmission of clear-text
   passwords over a channel protected by Transport Layer Security (TLS).
   There are some significant security concerns with that mechanism,
   which could be addressed by the use of a challenge response
   authentication mechanism protected by TLS.  Unfortunately, the HTTP
   Digest challenge response mechanism presently on the standards track
   failed widespread deployment, and have had success only in limited
   use.

   This specification describes a family of HTTP authentication
   mechanisms called the Salted Challenge Response Authentication
   Mechanism (SCRAM), which addresses the security concerns and meets
   the deployability requirements.  When used in combination with TLS or
   an equivalent security layer, a mechanism from this family could
   improve the status-quo for application protocol authentication.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 14, 2015.

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Copyright Notice

   Copyright (c) 2014 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.  Conventions Used in This Document . . . . . . . . . . . . . .   2
   1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . .   3
   1.2.  Notation  . . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  SCRAM Algorithm Overview  . . . . . . . . . . . . . . . . . .   6
   4.  SCRAM Mechanism Names . . . . . . . . . . . . . . . . . . . .   7
   5.  SCRAM Authentication Exchange . . . . . . . . . . . . . . . .   7
   5.1.  One round trip reauthentication . . . . . . . . . . . . . .  10
   5.2.  SCRAM Attributes  . . . . . . . . . . . . . . . . . . . . .  11
   6.  Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . .  14
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  18
   10. Design Motivations  . . . . . . . . . . . . . . . . . . . . .  19
   11. Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .  19
   12. Internet-Draft Change History . . . . . . . . . . . . . . . .  19
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  19
   13.1.  Normative References . . . . . . . . . . . . . . . . . . .  19
   13.2.  Informative References . . . . . . . . . . . . . . . . . .  20
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  21

1.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

   Formal syntax is defined by [RFC5234] including the core rules
   defined in Appendix B of [RFC5234].

   Example lines prefaced by "C:" are sent by the client and ones

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   prefaced by "S:" by the server.  If a single "C:" or "S:" label
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