impl-info: A link relation type for disclosing implementation information
draft-bormann-t2trg-rel-impl-02

Document Type Active Internet-Draft (individual)
Author Carsten Bormann 
Last updated 2020-09-27
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Network Working Group                                         C. Bormann
Internet-Draft                                    Universit├Ąt Bremen TZI
Intended status: Informational                         27 September 2020
Expires: 31 March 2021

     impl-info: A link relation type for disclosing implementation
                              information
                    draft-bormann-t2trg-rel-impl-02

Abstract

   For debugging, it is often helpful to have information about the
   implementation of a peer.  The present specification defines a link
   relation type, "impl-info", that can be used to convey such
   information via self-description, such as in the "/.well-known/core"
   resource.

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
   Task Force (IETF).  Note that other groups may also distribute
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 31 March 2021.

Copyright Notice

   Copyright (c) 2020 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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   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
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   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   2
   3.  Security considerations . . . . . . . . . . . . . . . . . . .   2
   4.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Normative References  . . . . . . . . . . . . . . . . . .   3
     4.2.  Informative References  . . . . . . . . . . . . . . . . .   3
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   When debugging an interoperability problem, it is often helpful to
   have information about the implementation version of a peer.  To
   enable the disclosure of such information, HTTP defines header fields
   such as Server and User-Agent [RFC7231].

   In CoAP [RFC7252], it is rarely appropriate to send information of
   this kind in every request or response.  Instead, the present
   specification defines a link relation type, "impl-info", that can be
   used to convey this information via the self-description capabilities
   of the "/.well-known/core" resource [RFC6690] and the CoRE resource
   directory [I-D.ietf-core-resource-directory].

2.  IANA Considerations

   This specification requests the registration of the link relation
   type "impl-info".

   The registration template as per [RFC8288] follows.

   *  _Relation Name_: "impl-info"

   *  _Description_: Refers to implementation information that may be
      helpful in diagnosing technical problems with the implementation
      of the context, such as lists of components and their
      implementation versions.

   *  _Reference_: [THIS]

3.  Security considerations

   The security considerations listed in Section 9.6 of [RFC7231] and
   the sections referenced there apply.

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   The security considerations listed in Section 11.3 of [RFC7252]
   apply.  As adding another link to "/.well-known/core" does increase
   the size of a response to a GET request for that resource, the
   mitigation mentioned in that section to limit the amplification
   factor becomes even more important.

   Disclosing information about an implementation can make it easier for
   an attacker to select an attack, or to build automated tools that
   search for promising victims.  Fingerprinting techniques can provide
   information to attackers that is usable in the same way, so adding
   information via self-description may or may not actually exacerbate
   this problem.

4.  References
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