Problem Statement and Requirements for Header Protection
draft-ietf-lamps-header-protection-requirements-01
Network Working Group A. Melnikov
Internet-Draft Isode Ltd
Intended status: Informational B. Hoeneisen
Expires: April 30, 2020 Ucom.ch
October 28, 2019
Problem Statement and Requirements for Header Protection
draft-ietf-lamps-header-protection-requirements-01
Abstract
Privacy and security issues with email header protection in S/MIME
have been identified for some time. However, the desire to fix these
issues has only recently been expressed in the IETF LAMPS Working
Group. The existing S/MIME specification is likely to be updated
regarding header protection.
This document describes the problem statement, generic use cases, and
requirements of header protection.
Status of This Memo
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This Internet-Draft will expire on April 30, 2020.
Copyright Notice
Copyright (c) 2019 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
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
Melnikov & Hoeneisen Expires April 30, 2020 [Page 1]
Internet-Draft Header Protection requirements October 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
1.2. Terms . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2. Problem Statement . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Privacy . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2. Security . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3. Usability . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4. Interoperability . . . . . . . . . . . . . . . . . . . . 5
3. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Interactions . . . . . . . . . . . . . . . . . . . . . . 5
3.2. Protection Levels . . . . . . . . . . . . . . . . . . . . 6
4. Requirements . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. General Requirements . . . . . . . . . . . . . . . . . . 7
4.1.1. Sending Side . . . . . . . . . . . . . . . . . . . . 7
4.1.2. Receiving Side . . . . . . . . . . . . . . . . . . . 8
4.2. Additional Requirements for Backward-Compatibility With
Legacy Clients Unaware of Header Protection . . . . . . . 8
4.2.1. Sending side . . . . . . . . . . . . . . . . . . . . 8
4.2.2. Receiving side . . . . . . . . . . . . . . . . . . . 9
4.3. Additional Requirements for Backward-Compatibility with
Legacy Header Protection Systems (if supported) . . . . . 9
4.3.1. Sending Side . . . . . . . . . . . . . . . . . . . . 9
4.3.2. Receiving Side . . . . . . . . . . . . . . . . . . . 9
5. Security Considerations . . . . . . . . . . . . . . . . . . . 9
6. Privacy Considerations . . . . . . . . . . . . . . . . . . . 10
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
9.1. Normative References . . . . . . . . . . . . . . . . . . 10
9.2. Informative References . . . . . . . . . . . . . . . . . 11
Appendix A. Implementation Considerations . . . . . . . . . . . 12
A.1. Options to Achieve Header Protection . . . . . . . . . . 12
A.1.1. Option 1: Memory Hole . . . . . . . . . . . . . . . . 12
A.1.2. Option 2: Wrapping with message/rfc822 or
message/global . . . . . . . . . . . . . . . . . . . 12
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