RFC 4871 DomainKeys Identified Mail (DKIM) Signatures -- Update
RFC 5672
| Document | Type |
RFC - Proposed Standard
(August 2009; No errata)
Obsoleted by RFC 6376
Updates RFC 4871
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | WG Document | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 5672 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Pasi Eronen | ||
| Send notices to | (None) | ||
Network Working Group D. Crocker, Ed.
Request for Comments: 5672 Brandenburg InternetWorking
Updates: 4871 August 2009
Category: Standards Track
RFC 4871 DomainKeys Identified Mail (DKIM) Signatures -- Update
Abstract
This document updates RFC 4871, "DomainKeys Identified Mail (DKIM)
Signatures". Specifically, the document clarifies the nature, roles,
and relationship of the two DKIM identifier tag values that are
candidates for payload delivery to a receiving processing module.
The Update is in the style of an Errata entry, albeit a rather long
one.
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (c) 2009 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 in effect on the date of
publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Crocker Standards Track [Page 1]
RFC 5672 RFC 4871 Update August 2009
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. RFC 4871, Abstract . . . . . . . . . . . . . . . . . . . . . . 4
3. RFC 4871, Section 1, Introduction . . . . . . . . . . . . . . 4
4. RFC 4871, Section 2.7, Identity . . . . . . . . . . . . . . . 4
5. RFC 4871, Section 2.8, Identifier . . . . . . . . . . . . . . 5
6. RFC 4871, Section 2.9, Signing Domain Identifier (SDID) . . . 5
7. RFC 4871, Section 2.10, Agent or User Identifier (AUID) . . . 5
8. RFC 4871, Section 2.11, Identity Assessor . . . . . . . . . . 6
9. RFC 4871, Section 3.5, The DKIM-Signature Header Field . . . . 6
10. RFC 4871, Section 3.5, The DKIM-Signature Header Field . . . . 7
11. RFC 4871, Section 3.8, Signing by Parent Domains . . . . . . . 9
12. RFC 4871, Section 3.9, Relationship between SDID and AUID . . 10
13. RFC 4871, Section 6.3, Interpret Results/Apply Local Policy . 11
14. RFC 4871, Section 6.3, Interpret Results/Apply Local Policy . 11
15. RFC 4871, Appendix D, MUA Considerations . . . . . . . . . . . 12
16. Security Considerations . . . . . . . . . . . . . . . . . . . 12
17. Normative References . . . . . . . . . . . . . . . . . . . . . 12
Appendix A. ABNF Fragments . . . . . . . . . . . . . . . . . . . 13
Appendix B. Acknowledgements . . . . . . . . . . . . . . . . . . 14
1. Introduction
About the purpose for DKIM, [RFC4871] states:
The ultimate goal of this framework is to permit a signing domain
to assert responsibility for a message, thus protecting message
signer identity...
Hence, DKIM has a signer that produces a signed message, a verifier
that confirms the signature, and an assessor that consumes the
validated signing domain. So, the simple purpose of DKIM is to
communicate an identifier to a receive-side assessor module. The
identifier is in the form of a domain name that refers to a
responsible identity. For DKIM to be interoperable and useful, the
signer and assessor must share the same understanding of the details
about the identifier.
However, the RFC 4871 specification defines two, potentially
different, identifiers that are carried in the DKIM-Signature: header
field, d= and i=. Either might be delivered to a receiving
processing module that consumes validated payload. The DKIM
specification fails to clearly define which is the "payload" to be
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