Internationalization Updates to RFC 5280
draft-housley-rfc5280-i18n-update-01

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INTERNET-DRAFT
Internet Engineering Task Force                               R. Housley
Intended Status: Proposed Standard                        Vigil Security
Updates: RFC 5280 (once approved)
Expires: 24 October 2017                                   24 April 2017

                Internationalization Updates to RFC 5280
                  draft-housley-rfc5280-i18n-update-01

Abstract

   These updates to RFC 5280 provide clarity on the handling of
   Internationalized Domain Names (IDNs) and Internationalized Email
   Addresses in X.509 Certificates.

Status of this Memo

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Copyright and License Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors. All rights reserved.

Housley                  Expires 24 October 2017                [Page 1]
INTERNET-DRAFT          I18n Updates to RFC 5280           24 April 2017

   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
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1.  Introduction

   This document updates RFC 5280 [RFC5280].  The Introduction in
   Section 1, the Name Constraints certificate extension discussion in
   Section 4.2.1.10, and the Processing Rules for Internationalized
   Names in Section 7 are updated to provide clarity on the handling of
   Internationalized Domain Names (IDNs) and Internationalized Email
   Addresses in X.509 Certificates.

   An IDN in Unicode (native character) form contains at least one
   U-label [RFC5890].  With one exception, IDNs are carried in
   certificates in ACE-encoded form.  That is, all U-labels within an
   IDN are converted to A-labels.  Conversion of an U-label to an
   A-label is described in [RFC5981].

   The GeneralName structure supports many different names forms,
   including otherName for extensibility.  [ID.lamps-eai-addresses]
   specifies the SmtpUTF8Name for Internationalized Email addresses,
   which include IDNs with U-labels.

   Note that Internationalized Domain Names in Applications
   specifications published in 2003 (IDNA2003) [RFC3490] and 2008
   (IDNA2008) [RFC5980] both refer to the Punycode Algorithm for
   conversion [RFC3492].

1.1.  Terminology

   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 RFC 2119 [RFC2119].

2.  Updates

   This section provides updates to several paragraphs of RFC 5280
   [RFC5280].  For clarity, if the entire section is not replace, then
   the original text and the replacement text are shown.

Housley                  Expires 24 October 2017                [Page 2]
INTERNET-DRAFT          I18n Updates to RFC 5280           24 April 2017

2.1.  Update in Section 1, Introduction

   This update includes references for IDNA2008.

OLD

      * Enhanced support for internationalized names is specified in
        Section 7, with rules for encoding and comparing
        Internationalized Domain Names, Internationalized Resource
        Identifiers (IRIs), and distinguished names.  These rules are
        aligned with comparison rules established in current RFCs,
        including [RFC3490], [RFC3987], and [RFC4518].

NEW

      * Enhanced support for internationalized names is specified in
        Section 7, with rules for encoding and comparing
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