Securing Session Initiation Protocol (SIP) based Messaging with S/MIME
draft-campbell-sip-messaging-smime-00

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Network Working Group                                        B. Campbell
Internet-Draft                                               Independent
Updates: RFC 3261, RFC 3428, RFC 4975                         R. Housley
         (if approved)                                    Vigil Security
Intended status: Standards Track                        October 30, 2017
Expires: May 3, 2018

 Securing Session Initiation Protocol (SIP) based Messaging with S/MIME
                 draft-campbell-sip-messaging-smime-00

Abstract

   Mobile messaging applications used with the Session Initiation
   Protocol (SIP) commonly use some combination of the SIP MESSAGE
   method and the Message Session Relay Protocol (MSRP).  While these
   provide mechanisms for hop-by-hop security, neither natively provides
   end-to-end protection.  This document offers guidance on how to
   provide end-to-end authentication, integrity protection, and
   confidentiality using the Secure/Multipurpose Internet Mail
   Extensions (S/MIME).  It updates and provides clarifications for RFC
   3261, RFC 3428, and RFC 4975.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on May 3, 2018.

Copyright Notice

   Copyright (c) 2017 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
   (https://trustee.ietf.org/license-info) in effect on the date of

Campbell & Housley         Expires May 3, 2018                  [Page 1]
Internet-Draft          S/MIME for SIP Messaging            October 2017

   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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Scope of This Document  . . . . . . . . . . . . . . . . . . .   4
   4.  Applicability of S/MIME . . . . . . . . . . . . . . . . . . .   4
     4.1.  Signed Messages . . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Encrypted Messages  . . . . . . . . . . . . . . . . . . .   5
     4.3.  Signed and Encrypted Messages . . . . . . . . . . . . . .   6
     4.4.  Certificate Handling  . . . . . . . . . . . . . . . . . .   7
       4.4.1.  Subject Alternative Name  . . . . . . . . . . . . . .   7
       4.4.2.  Certificate Validation  . . . . . . . . . . . . . . .   7
   5.  Transfer Encoding . . . . . . . . . . . . . . . . . . . . . .   7
   6.  User Agent Capabilities . . . . . . . . . . . . . . . . . . .   7
   7.  Using S/MIME with the SIP MESSAGE Method  . . . . . . . . . .   8
     7.1.  Size Limit  . . . . . . . . . . . . . . . . . . . . . . .   8
     7.2.  User Agent Capabilities . . . . . . . . . . . . . . . . .   9
     7.3.  Failure Cases . . . . . . . . . . . . . . . . . . . . . .   9
   8.  Using S/MIME with MSRP  . . . . . . . . . . . . . . . . . . .  10
     8.1.  Chunking  . . . . . . . . . . . . . . . . . . . . . . . .  10
     8.2.  Streamed Data . . . . . . . . . . . . . . . . . . . . . .  10
     8.3.  Indicating support for S/MIME . . . . . . . . . . . . . .  11
     8.4.  MSRP URIs . . . . . . . . . . . . . . . . . . . . . . . .  11
     8.5.  Failure Cases . . . . . . . . . . . . . . . . . . . . . .  12
   9.  S/MIME Interaction with other SIP Messaging Features  . . . .  12
     9.1.  Common Profile for Instant Messaging  . . . . . . . . . .  12
     9.2.  Instant Message Delivery Notifications  . . . . . . . . .  13
   10. Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  13
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     13.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17