Extensions to JMAP for S/MIME signature verification
draft-ietf-jmap-smime-00

Document Type Active Internet-Draft (jmap WG)
Last updated 2019-07-08
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Network Working Group                                        A. Melnikov
Internet-Draft                                                 Isode Ltd
Intended status: Informational                              July 8, 2019
Expires: January 9, 2020

          Extensions to JMAP for S/MIME signature verification
                        draft-ietf-jmap-smime-00

Abstract

   This document specifies extension to JMAP for returning S/MIME
   signature verification status.

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 January 9, 2020.

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   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
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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   2
   3.  Addition to the capabilities object . . . . . . . . . . . . .   2
   4.  Extension to Email/get for S/MIME signature verification  . .   2
   5.  Open Issues . . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  JMAP capability registration for "smime"  . . . . . . . .   4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   [I-D.ietf-jmap-mail] is a JSON based application protocol for
   synchronising email data between a client and a server.

   This document describes an extension to JMAP for returning S/MIME
   [RFC8551] signature verification status, without requiring a JMAP
   client to download the signature and all signed body parts or to
   download and decode CMS.

2.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Addition to the capabilities object

   The capabilities object is returned as part of the standard JMAP
   Session object; see the JMAP spec.  Servers supporting _this_
   specification MUST add a property called "urn:ietf:params:jmap:smime"
   to the capabilities object.

   The value of this property is an empty object in both the JMAP
   session _capabilities_ property and an account's
   _accountCapabilities_ property.

4.  Extension to Email/get for S/MIME signature verification

   [I-D.ietf-jmap-mail] defines Email/get method for retrieving message
   specific information.  This document defines the following pseudo
   values in the _properties_ argument:
   o *smimeStatus*: If "smimeStatus" is included in the list of
   requested properties, it MUST be interpreted by the server as a
   request to return "smimeStatus" property.

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   The "smimeStatus" response property is defined as follows:

   *smimeStatus*: "String|null". null signifies that the message doesn't
   contain any signature.  Possible string values of the property are
   listed below.  Servers MAY return other values not defined below.
   Client MUST treat unrecognized values as "unknown":

   unknown  S/MIME message, but it is neither signed, nor encrypted.
      This can also be returned for a multipart/signed message which
      contains unrecognized signing protocol (for example OpenPGP).

   signed  S/MIME signed message, but the signature was not yet
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