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
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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
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