Certificate Management Service for the Session Initiation Protocol (SIP)
RFC 6072

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Internet Engineering Task Force (IETF)                       C. Jennings
Request for Comments: 6072                                 Cisco Systems
Category: Standards Track                                 J. Fischl, Ed.
ISSN: 2070-1721                                                    Skype
                                                           February 2011

Certificate Management Service for the Session Initiation Protocol (SIP)

Abstract

   This document defines a credential service that allows Session
   Initiation Protocol (SIP) User Agents (UAs) to use a SIP event
   package to discover the certificates of other users.  This mechanism
   allows User Agents that want to contact a given Address-of-Record
   (AOR) to retrieve that AOR's certificate by subscribing to the
   credential service, which returns an authenticated response
   containing that certificate.  The credential service also allows
   users to store and retrieve their own certificates and private keys.

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/rfc6072.

Jennings & Fischl            Standards Track                    [Page 1]
RFC 6072                    SIP Certificates               February 2011

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
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   described in the Simplified BSD License.

   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
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   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.

Table of Contents

   1. Introduction ....................................................3
   2. Definitions .....................................................4
   3. Overview ........................................................4
   4. UA Behavior with Certificates ...................................7
   5. UA Behavior with Credentials ....................................8
   6. Event Package Formal Definition for "certificate" ...............9
      6.1. Event Package Name .........................................9
      6.2. SUBSCRIBE Bodies ...........................................9
      6.3. Subscription Duration .....................................10
      6.4. NOTIFY Bodies .............................................10
      6.5. Subscriber Generation of SUBSCRIBE Requests ...............10
      6.6. Notifier Processing of SUBSCRIBE Requests .................11
      6.7. Notifier Generation of NOTIFY Requests ....................11
      6.8. Subscriber Processing of NOTIFY Requests ..................11
      6.9. Handling of Forked Requests ...............................11
      6.10. Rate of Notifications ....................................12
      6.11. State Agents and Lists ...................................12
      6.12. Behavior of a Proxy Server ...............................12

Jennings & Fischl            Standards Track                    [Page 2]
RFC 6072                    SIP Certificates               February 2011

   7. Event Package Formal Definition for "credential" ...............12
      7.1. Event Package Name ........................................12
      7.2. SUBSCRIBE Bodies ..........................................12
      7.3. Subscription Duration .....................................12
      7.4. NOTIFY Bodies .............................................13