An Proxy Use Case of DNS over HTTPS
draft-ietf-dnsop-dns-wireformat-http-02
Internet Engineering Task Force L. Song
Internet-Draft Beijing Internet Institute
Intended status: Experimental P. Vixie
Expires: September 22, 2018 TISF
S. Kerr
March 21, 2018
An Proxy Use Case of DNS over HTTPS
draft-ietf-dnsop-dns-wireformat-http-02
Abstract
This memo introduces a DNS proxy use case to tunnel DNS query and
response over HTTPs using DOH, a newly proposed DNS transport. This
is useful in some situation where DNS is not working properly and DOH
is not widely available for many stub-resolvers.
Status of This Memo
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Internet-Draft An Proxy Use Case of DNS over HTTPS March 2018
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Use case description . . . . . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 3
4. IANA considerations . . . . . . . . . . . . . . . . . . . . . 4
4.1. Registration of application/dns-tcpwireformat Media Type 4
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 6
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 6
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 DOH is proposed which transport DNS over HTTPs
[I-D.ietf-doh-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
called DOH proxy in the rest of the document. It is useful
especially when most DNS stub-resolvers and 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. The only difference is DOH
proxy consist two part, a proxy client as a initiator of DOH tunnel
and a proxy server as a terminator.
In order to keep the transparency of DOH proxy, a new media type is
required in DOH proxy use case to allow the proxy client and proxy
server use the same transport (UDP or TCP) connecting sub-resolver
and far-end server.
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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2. Use case description
As mentioned in introduction, DOH proxy is a special use case to
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