Alternative Challenge Password Attributes for Enrollment over Secure Transport
RFC 7894
| Document | Type |
RFC - Proposed Standard
(June 2016; No errata)
Was draft-wallace-est-alt-challenge (individual)
|
|
|---|---|---|---|
| Last updated | 2016-06-08 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | (None) | |
| Document shepherd | Russ Housley | ||
| Shepherd write-up | Show (last changed 2016-02-08) | ||
| IESG | IESG state | RFC 7894 (Proposed Standard) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Stephen Farrell | ||
| Send notices to | pkix@ietf.org | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
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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