DNS X-Proxied-For
draft-bellis-dnsop-xpf-02

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Last updated 2017-07-03
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DNSOP Working Group                                            R. Bellis
Internet-Draft                                                       ISC
Updates: RFC 2845, RFC 2931 (if                              P. van Dijk
         approved) (if approved)                              R. Gacogne
Intended status: Standards Track                                PowerDNS
Expires: January 4, 2018                                   July 03, 2017

                           DNS X-Proxied-For
                       draft-bellis-dnsop-xpf-02

Abstract

   It is becoming more commonplace to install front end proxy devices in
   front of DNS servers to provide (for example) load balancing or to
   perform transport layer conversions.

   This document defines a meta resource record that allows a DNS server
   to receive information about the client's original transport protocol
   parameters when supplied by trusted proxies.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 4, 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
   (http://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

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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Description . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Proxy Processing  . . . . . . . . . . . . . . . . . . . .   3
     3.2.  Server Processing . . . . . . . . . . . . . . . . . . . .   4
     3.3.  Wire Format . . . . . . . . . . . . . . . . . . . . . . .   4
     3.4.  Presentation Format . . . . . . . . . . . . . . . . . . .   5
     3.5.  Signed DNS Requests . . . . . . . . . . . . . . . . . . .   6
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   It is becoming more commonplace to install front end proxy devices in
   front of DNS servers [RFC1035] to provide load balancing or to
   perform transport layer conversions (e.g. to add DNS over TLS
   [RFC7858] to a DNS server that lacks native support).

   This has the unfortunate side effect of hiding the clients' source IP
   addresses from the server, making it harder to employ server-side
   technologies that rely on knowing those addresses (e.g.  ACLs, DNS
   Response Rate Limiting, etc).

   This document defines a DNS meta resource record (RR) that allows a
   DNS server to receive information about the client's original
   transport protocol parameters when supplied by trusted proxies.

   Whilst in some circumstances it would be possible to re-use the
   Client Subnet EDNS Option [RFC7871] to carry a subset of this
   information, a new RR is defined to allow both this feature and the
   Client Subnet Option to co-exist in the same packet.

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