Network Working Group A. Melnikov, Ed.
Internet-Draft Isode Ltd
Intended status: Standards Track May 21, 2016
Expires: November 22, 2016
Internationalized Email Addresses in X.509 certificates
draft-melnikov-spasm-eai-addresses-00.txt
Abstract
This document defines a new name form for inclusion in the otherName
field of an X.509 Subject Alternative Name extension that allows a
certificate subject to be associated with an Internationalized Email
Address.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions Used in This Document . . . . . . . . . . . . . . 2
3. Name Definitions . . . . . . . . . . . . . . . . . . . . . . 2
4. Matching of Internationalized Email Addresses in X.509
certificates . . . . . . . . . . . . . . . . . . . . . . . . 3
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
6. Security Considerations . . . . . . . . . . . . . . . . . . . 3
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 3
7.1. Normative References . . . . . . . . . . . . . . . . . . 3
7.2. Informative References . . . . . . . . . . . . . . . . . 4
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 4
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 4
1. Introduction
[RFC5280] defines rfc822Name subjectAltName choice for representing
[RFC5322] email addresses. This form is restricted to a subset of
US-ASCII characters and thus can't be used to represent
Internationalized Email addresses [RFC6531].
2. 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].
The formal syntax use the Augmented Backus-Naur Form (ABNF) [RFC5234]
notation.
3. Name Definitions
This section defines the eaiName name as a form of otherName from the
GeneralName structure in SubjectAltName defined in [RFC5280].
id-on-eaiAddr OBJECT IDENTIFIER ::= { id-on XXX }
eaiName ::= UTF8String (SIZE (1..MAX))
When the subjectAltName extension contains an Internationalized Email
address, the address MUST be stored in the eaiName name form of
otherName. The format of an eaiName is a <eaiMailbox> as defined
below. A eaiMailbox has the form "uLocal-part@uDomain". Note that a
eaiMailbox has no phrase (such as a common name) before it, has no
comment (text surrounded in parentheses) after it, and is not
surrounded by "<" and ">".
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eaiMailbox = uLocal-part "@" uDomain
uLocal-part and uDomain are defined in [RFC6531]. [[CREF1: Alexey:
uLocal-part and uDomain are no longer in RFC 6531, so we need to
write explicit rules]]
4. Matching of Internationalized Email Addresses in X.509 certificates
The <uLocal-part> part of an Internationalized email address is in
UTF-8 and need to be compared octet for octet.
The <uDomain> can contain either IDN domain or an ASCII Compatible
Encoding (ACE) format. When comparing two <uDomain>s both MUST be
converted to the ACE form as described in section 7.2 of [RFC5280].
5. IANA Considerations
[[CREF2: Just need a new OID.]]
6. Security Considerations
[[CREF3: TBD]]
7. References
7.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<http://www.rfc-editor.org/info/rfc2119>.
[RFC3629] Yergeau, F., "UTF-8, a transformation format of ISO
10646", STD 63, RFC 3629, DOI 10.17487/RFC3629, November
2003, <http://www.rfc-editor.org/info/rfc3629>.
[RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", STD 68, RFC 5234,
DOI 10.17487/RFC5234, January 2008,
<http://www.rfc-editor.org/info/rfc5234>.
[RFC5280] Cooper, D., Santesson, S., Farrell, S., Boeyen, S.,
Housley, R., and W. Polk, "Internet X.509 Public Key
Infrastructure Certificate and Certificate Revocation List
(CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, May 2008,
<http://www.rfc-editor.org/info/rfc5280>.
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[RFC6531] Yao, J. and W. Mao, "SMTP Extension for Internationalized
Email", RFC 6531, DOI 10.17487/RFC6531, February 2012,
<http://www.rfc-editor.org/info/rfc6531>.
7.2. Informative References
[RFC5322] Resnick, P., Ed., "Internet Message Format", RFC 5322,
DOI 10.17487/RFC5322, October 2008,
<http://www.rfc-editor.org/info/rfc5322>.
Appendix A. Acknowledgements
Thank you to Magnus Nystrom for motivating this document.
Author's Address
Alexey Melnikov (editor)
Isode Ltd
14 Castle Mews
Hampton, Middlesex TW12 2NP
UK
Email: Alexey.Melnikov@isode.com
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