DNS Access Denied Error Page
draft-reddy-dnsop-error-page-06
DNSOP WG T. Reddy
Internet-Draft McAfee
Intended status: Standards Track N. Cook
Expires: July 18, 2021 Open-Xchange
D. Wing
Citrix
M. Boucadair
Orange
January 14, 2021
DNS Access Denied Error Page
draft-reddy-dnsop-error-page-06
Abstract
When a DNS server filters a query, the response to such query conveys
no detailed explanation that explains why that query was blocked,
leading thus to end-user confusion. A solution to this problem is
needed in order to enhance the user experience.
This document defines a method to return an URI that explains the
reason why a DNS query was filtered by a DNS server.
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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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 18, 2021.
Copyright Notice
Copyright (c) 2021 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
Reddy, et al. Expires July 18, 2021 [Page 1]
Internet-Draft DNS Access Denied Error Page January 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Error page URI EDNS0 Option Format . . . . . . . . . . . . . 6
4. Error Page URI Processing . . . . . . . . . . . . . . . . . . 8
5. Sign and Verify . . . . . . . . . . . . . . . . . . . . . . . 10
6. Error Page . . . . . . . . . . . . . . . . . . . . . . . . . 10
7. Usability Considerations . . . . . . . . . . . . . . . . . . 11
8. Security Considerations . . . . . . . . . . . . . . . . . . . 11
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
9.1. A New Error Page URI EDNS Option . . . . . . . . . . . . 12
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 12
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 12
11.1. Normative References . . . . . . . . . . . . . . . . . . 12
11.2. Informative References . . . . . . . . . . . . . . . . . 14
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 16
1. Introduction
DNS filters are deployed for a variety of reasons, including endpoint
security, parental filtering, and filtering required by law
enforcement. Some of these reasons 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 upon 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 their
DNS responses in real time in order to stop access to malware and
phishing domains. Note that some of the commonly known types of
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