DNS Access Denied Error page
draft-reddy-dnsop-error-page-02

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Last updated 2020-07-27
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DNSOP WG                                                        T. Reddy
Internet-Draft                                                    McAfee
Intended status: Standards Track                                 N. Cook
Expires: January 28, 2021                                   Open-Xchange
                                                                 D. Wing
                                                                  Citrix
                                                            M. Boucadair
                                                                  Orange
                                                           July 27, 2020

                      DNS Access Denied Error page
                    draft-reddy-dnsop-error-page-02

Abstract

   When a DNS server filters a query the response conveys no detailed
   explanation of why the query was blocked, leading to end-user
   confusion.  This document defines a method to return an URL that
   explains the reason the DNS query was filtered.

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 https://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 28, 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
   Provisions Relating to IETF Documents
   (https://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

Reddy, et al.           Expires January 28, 2021                [Page 1]
Internet-Draft        DNS Access Denied Error Page             July 2020

   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 . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Method to return the error page URL . . . . . . . . . . . . .   5
   4.  ERROR Page  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Usability Considerations  . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Error Page URL DNS Parameter  . . . . . . . . . . . . . .   8
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   DNS filters are deployed for a variety of reasons including endpoint
   security, parental filtering, and filtering required by law
   enforcement.  These are discussed in more detail below:

   o  Various network security services are provided by Enterprise
      networks to protect endpoints (e.g., Hosts including IoT devices).
      Network-based security solutions such as firewalls and Intrusion
      Prevention Systems (IPS) rely on network traffic inspection to
      implement perimeter-based security policies.  The network security
      services may, for example, prevent malware download, block known
      malicious domains, block phishing sites, etc.  These network
      security services act on DNS queries originating from endpoints.
      For example, DNS firewalls, a method of expressing DNS response
      policy information inside specially constructed DNS zones, known
      as Response Policy Zones (RPZs) allows DNS servers to modify DNS
      responses in real time to stop access to malware and phishing
      domains.  Note that some of the commonly known types of malware
      are viruses, worms, trojans, bots, ransomware, backdoors, spyware,
      and adware.

   o  Network devices in a home network offer network security to
      protect the devices connected to the home network by performing
      DNS-based content filtering.  The network security service may,
      for example, block access to specific domains to enforce parental
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