Internationalization Updates to RFC 5280
RFC 8399

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Internet Engineering Task Force (IETF)                        R. Housley
Request for Comments: 8399                                Vigil Security
Updates: 5280                                                   May 2018
Category: Standards Track
ISSN: 2070-1721

                Internationalization Updates to RFC 5280

Abstract

   The updates to RFC 5280 described in this document provide alignment
   with the 2008 specification for Internationalized Domain Names (IDNs)
   and add support for internationalized email addresses in X.509
   certificates.

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
   https://www.rfc-editor.org/info/rfc8399.

Housley                      Standards Track                    [Page 1]
RFC 8399                I18n Updates to RFC 5280                May 2018

Copyright Notice

   Copyright (c) 2018 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
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   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
      1.1. Terminology ................................................3
   2. Updates to RFC 5280 .............................................3
      2.1. Update in the Introduction (Section 1) .....................4
      2.2. Update in Name Constraints (Section 4.2.1.10) ..............4
      2.3. Update in IDNs in GeneralName (Section 7.2) ................5
      2.4. Update in IDNs in Distinguished Names (Section 7.3) ........6
      2.5. Update in Internationalized Electronic Mail
           Addresses (Section 7.5) ....................................6
   3. Security Considerations .........................................7
   4. IANA Considerations .............................................8
   5. References ......................................................8
      5.1. Normative References .......................................8
      5.2. Informative References .....................................9
   Acknowledgements ...................................................9
   Author's Address ...................................................9

Housley                      Standards Track                    [Page 2]
RFC 8399                I18n Updates to RFC 5280                May 2018

1.  Introduction

   This document updates 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 of RFC
   5280 [RFC5280] to provide alignment with the 2008 specification for
   Internationalized Domain Names (IDNs) and add support for
   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 a U-label to an A-label
   is described in [RFC5891].

   The GeneralName structure supports many different name forms,
   including otherName for extensibility.  RFC 8398 [RFC8398] specifies
   the SmtpUTF8Mailbox for internationalized email addresses, which
   includes IDNs with U-labels.