Salted Challenge Response (SCRAM) HTTP Authentication Mechanism
draft-ietf-httpauth-scram-auth-05
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Alexey Melnikov
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2015-03-07
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HTTPAUTH A. Melnikov
Internet-Draft Isode Ltd
Intended status: Standards Track March 7, 2015
Expires: September 8, 2015
Salted Challenge Response (SCRAM) HTTP Authentication Mechanism
draft-ietf-httpauth-scram-auth-05.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 security concerns with HTTP Digest
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 HTTP 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 September 8, 2015.
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Internet-Draft HTTP SCRAM March 2015
Copyright Notice
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
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
6. Use of Authentication-Info header field with SCRAM . . . . . 11
7. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . . . 11
8. Security Considerations . . . . . . . . . . . . . . . . . . . 12
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 14
11. Design Motivations . . . . . . . . . . . . . . . . . . . . . 14
12. Open Issues . . . . . . . . . . . . . . . . . . . . . . . . . 15
13. References . . . . . . . . . . . . . . . . . . . . . . . . . 15
13.1. Normative References . . . . . . . . . . . . . . . . . . . 15
13.2. Informative References . . . . . . . . . . . . . . . . . . 16
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 17
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
prefaced by "S:" by the server. If a single "C:" or "S:" label
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applies to multiple lines, then the line breaks between those lines
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