Representation and Verification of Domain-Based Application Service Identity within Internet Public Key Infrastructure Using X.509 (PKIX) Certificates in the Context of Transport Layer Security (TLS)
RFC 6125

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Internet Engineering Task Force (IETF)                    P. Saint-Andre
Request for Comments: 6125                                         Cisco
Category: Standards Track                                      J. Hodges
ISSN: 2070-1721                                                   PayPal
                                                              March 2011

  Representation and Verification of Domain-Based Application Service
 Identity within Internet Public Key Infrastructure Using X.509 (PKIX)
     Certificates in the Context of Transport Layer Security (TLS)

Abstract

   Many application technologies enable secure communication between two
   entities by means of Internet Public Key Infrastructure Using X.509
   (PKIX) certificates in the context of Transport Layer Security (TLS).
   This document specifies procedures for representing and verifying the
   identity of application services in such interactions.

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 5741.

   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/rfc6125.

Copyright Notice

   Copyright (c) 2011 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.

Saint-Andre & Hodges         Standards Track                    [Page 1]
RFC 6125                    Service Identity                  March 2011

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Motivation . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.2.  Audience . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.3.  How to Read This Document  . . . . . . . . . . . . . . . .  4
     1.4.  Applicability  . . . . . . . . . . . . . . . . . . . . . .  5
     1.5.  Overview of Recommendations  . . . . . . . . . . . . . . .  5
     1.6.  Generalization from Current Technologies . . . . . . . . .  6
     1.7.  Scope  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
       1.7.1.  In Scope . . . . . . . . . . . . . . . . . . . . . . .  7
       1.7.2.  Out of Scope . . . . . . . . . . . . . . . . . . . . .  7
     1.8.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  9
   2.  Naming of Application Services . . . . . . . . . . . . . . . . 13
     2.1.  Naming Application Services  . . . . . . . . . . . . . . . 13
     2.2.  DNS Domain Names . . . . . . . . . . . . . . . . . . . . . 14
     2.3.  Subject Naming in PKIX Certificates  . . . . . . . . . . . 15
       2.3.1.  Implementation Notes . . . . . . . . . . . . . . . . . 17
   3.  Designing Application Protocols  . . . . . . . . . . . . . . . 18
   4.  Representing Server Identity . . . . . . . . . . . . . . . . . 18
     4.1.  Rules  . . . . . . . . . . . . . . . . . . . . . . . . . . 18
     4.2.  Examples . . . . . . . . . . . . . . . . . . . . . . . . . 20
   5.  Requesting Server Certificates . . . . . . . . . . . . . . . . 21
   6.  Verifying Service Identity . . . . . . . . . . . . . . . . . . 21
     6.1.  Overview . . . . . . . . . . . . . . . . . . . . . . . . . 21
     6.2.  Constructing a List of Reference Identifiers . . . . . . . 22
       6.2.1.  Rules  . . . . . . . . . . . . . . . . . . . . . . . . 22
       6.2.2.  Examples . . . . . . . . . . . . . . . . . . . . . . . 24
     6.3.  Preparing to Seek a Match  . . . . . . . . . . . . . . . . 25
     6.4.  Matching the DNS Domain Name Portion . . . . . . . . . . . 26
       6.4.1.  Checking of Traditional Domain Names . . . . . . . . . 27
       6.4.2.  Checking of Internationalized Domain Names . . . . . . 27
       6.4.3.  Checking of Wildcard Certificates  . . . . . . . . . . 27
       6.4.4.  Checking of Common Names . . . . . . . . . . . . . . . 28
     6.5.  Matching the Application Service Type Portion  . . . . . . 28
       6.5.1.  SRV-ID . . . . . . . . . . . . . . . . . . . . . . . . 29
       6.5.2.  URI-ID . . . . . . . . . . . . . . . . . . . . . . . . 29
     6.6.  Outcome  . . . . . . . . . . . . . . . . . . . . . . . . . 29