An Proxy Use Case of DNS over HTTPS
draft-ietf-dnsop-dns-wireformat-http-03
Internet Engineering Task Force L. Song
Internet-Draft Beijing Internet Institute
Intended status: Experimental P. Vixie
Expires: January 3, 2019 TISF
S. Kerr
July 2, 2018
An Proxy Use Case of DNS over HTTPS
draft-ietf-dnsop-dns-wireformat-http-03
Abstract
This memo introduces a DNS proxy use case to tunnel DNS query and
response using DNS over HTTPs (DOH) protocol, a newly proposed DNS
transport. The proxy use case is useful as a incremental adoption
tool when DOH is not widely available in old-transport client and
server.
Status of This Memo
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This Internet-Draft will expire on January 3, 2019.
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Internet-Draft An Proxy Use Case of DNS over HTTPS July 2018
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Use case description . . . . . . . . . . . . . . . . . . . . 3
3. Original transport indicator in DOH proxy . . . . . . . . . . 4
4. Implementation considerations . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 4
6. IANA considerations . . . . . . . . . . . . . . . . . . . . . 5
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 5
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
RFC 1035 [RFC1035] specifies the wire format for DNS messages. It
also specifies DNS transport on UDP and TCP on port 53, which is
still used today. To enhance the availability of honest DNS, a new
DNS transport: DNS over HTTPs (DOH) [I-D.ietf-doh-dns-over-https] is
proposed which transport DNS over HTTPs , in a way to cure DNS's
long-time suffering from on-path attack by spoofing and blocking.
This memo introduces a DNS proxy use case to leverage the DOH
protocol as a substrate to tunnel DNS data over HTTPs which is called
DOH proxy in the rest of the document. It is useful especially when
most DNS stub-resolvers and far-end servers are not aware the new DOH
protocol, but a public or private proxy using DOH can be deployed and
offer DOH capacity to users to bypass the networks where DNS is not
working properly.
Just as a normal DNS proxy described in [RFC5625], DOH proxy works as
a simple DNS forwarder keeping the transparency principle, so any
"hop-by-hop" mechanisms or newly introduced protocol extensions
operate as if the proxy were not there.
In order to keep the transparency of DOH proxy, a new variable
"proto" in URI Template is defined for DOH proxy use case. It allows
the proxy server use the same transport protocol (UDP or TCP) to
forward DNS query to far-end server just as the stub-client does
without DOH proxy.
May REMOVE BEFORE PUBLICATION: Comparing using a general VPN, the DOH
proxy can work on an actual HTTP server, so it can be hosted on a
machine that also serves web pages. This means that DNS over HTTP is
slightly more "stealthy" than a VPN, in that it can be
indistinguishable from normal web traffic.
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