Update to Additional Registered Clauses in SMTP Received Headers
draft-levine-additional-registered-clauses-02

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Last updated 2019-01-26
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Network Working Group                                          J. Levine
Internet-Draft                                      Taughannock Networks
Updates: 5321 (if approved)                             January 26, 2019
Intended status: Standards Track
Expires: July 30, 2019

    Update to Additional Registered Clauses in SMTP Received Headers
             draft-levine-additional-registered-clauses-02

Abstract

   SMTP servers add Received: trace headers to mail messages to track
   their progress This document updates the registration criteria for
   Additional Registered Clauses in those headers to Expert Review, and
   adds a new clause for Server Name Indication (SNI).

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 July 30, 2019.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  The Server Name Indication clause . . . . . . . . . . . . . .   2
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Guidance for Designated Expert  . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     5.2.  Uninformative References  . . . . . . . . . . . . . . . .   4
   Appendix A.  Change history . . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   SMTP servers add Received: trace headers to mail messages to track
   their progress.  The syntax of those headers is defined in [RFC5321].
   Each header can include optional Additional Registered Clauses that
   log information related to optional SMTP features.

   This document updates the registration criteria for Additional
   Registered Clauses in those headers to Expert Review, and adds a new
   clause for Server Name Indication (SNI).  The headers can include
   Additional Registered Clauses that add information about optional
   SMTP features.

2.  The Server Name Indication clause

   Server Name Indication or SNI [RFC6066] is an optional TLS feature
   that a TLS client can use to advise a server the name it expects the
   server to have.  When used in the initial negotiation for a STARTTLS
   [RFC3207] session it enables the server to use a certificate with the
   identity that the client expects, as is recommended in [RFC7817] and
   is required for SMTP MTA-STS [RFC8461].  When a client presents a
   name using SNI, the server can log the name using the "sni"
   additional-registered-clause.

   IANA is requested to add one new entry to the additional-registered-
   clauses registry:

      "sni" - indicates the Server Name Indication was used.

      "name" - the name provided by SNI.  It has the syntax of a Domain
      Name.

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3.  IANA Considerations

   IANA is requested to update the Registration Procedure for the
   Additional-registered-clauses registry to Expert Review.  The IESG
   will appoint the expert(s).

3.1.  Guidance for Designated Expert

   The Designated Expert is expected to check that a proposed
   Additional-registered-clause has a specification that is stable and
   detailed enough to implement the clause and interoperate.  The Expert
   should ensure that the clause name is reasonably related to the
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