EDNS X-Proxied-For
draft-bellis-dnsop-xpf-00

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DNSOP Working Group                                            R. Bellis
Internet-Draft                                                       ISC
Intended status: Standards Track                        January 06, 2017
Expires: July 10, 2017

                           EDNS X-Proxied-For
                       draft-bellis-dnsop-xpf-00

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 an option within the EDNS(0) Extension
   Mechanism for DNS that allows a DNS server to receive the original
   client source IP address 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 July 10, 2017.

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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Description . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  EDNS Option Format  . . . . . . . . . . . . . . . . . . .   3
     3.2.  Proxy Processing  . . . . . . . . . . . . . . . . . . . .   3
     3.3.  Server Processing . . . . . . . . . . . . . . . . . . . .   4
     3.4.  Secret Key Transaction Authentication for DNS (TSIG)  . .   4
     3.5.  Multi-tier Proxies  . . . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   It is becoming more commonplace to install front end proxy devices in
   front of DNS servers [RFC1035] to provide (for example) load
   balancing or to perform transport layer conversions.

   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 address (e.g.  ACLs, DNS
   Response Rate Limiting, etc).

   This document defines an option within the EDNS(0) Extension
   Mechanism for DNS [RFC6891] that allows a DNS server to receive the
   original client source IP address when supplied by trusted proxies.

   This specification is only intended for use on server-side proxy
   devices that are under the same administrative control as the DNS
   servers themselves.  As such there is no change in the scope within
   which any private information might be shared.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   "Key words for use in RFCs to Indicate Requirement Levels" [RFC2119].

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3.  Description

3.1.  EDNS Option Format

   The overall format of an EDNS option is shown for reference below,
   per [RFC6891], followed by the option specific data:

      +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
   0: |                          OPTION-CODE                          |
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