Oblivious HTTP
draft-thomson-http-oblivious-01
HTTPBIS M. Thomson
Internet-Draft Mozilla
Intended status: Standards Track C.A. Wood
Expires: 25 August 2021 Cloudflare
21 February 2021
Oblivious HTTP
draft-thomson-http-oblivious-01
Abstract
This document describes a system for the forwarding of encrypted HTTP
messages. This allows a client to make multiple requests of a server
without the server being able to link those requests to the client or
to identify the requests as having come from the same client.
Discussion Venues
This note is to be removed before publishing as an RFC.
Discussion of this document takes place on the HTTP Working Group
mailing list (http@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/browse/http/.
Source for this draft and an issue tracker can be found at
https://github.com/unicorn-wg/oblivious-http.
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 25 August 2021.
Thomson & Wood Expires 25 August 2021 [Page 1]
Internet-Draft Oblivious HTTP February 2021
Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 4
3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. Applicability . . . . . . . . . . . . . . . . . . . . . . 6
4. Key Configuration . . . . . . . . . . . . . . . . . . . . . . 7
4.1. Key Configuration Encoding . . . . . . . . . . . . . . . 8
4.2. Key Configuration Media Type . . . . . . . . . . . . . . 8
5. HPKE Encapsulation . . . . . . . . . . . . . . . . . . . . . 9
5.1. Encapsulation of Requests . . . . . . . . . . . . . . . . 10
5.2. Encapsulation of Responses . . . . . . . . . . . . . . . 12
6. HTTP Usage . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1. Informational Responses . . . . . . . . . . . . . . . . . 14
6.2. Errors . . . . . . . . . . . . . . . . . . . . . . . . . 14
7. Media Types . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.1. message/ohttp-req Media Type . . . . . . . . . . . . . . 15
7.2. message/ohttp-res Media Type . . . . . . . . . . . . . . 16
8. Security Considerations . . . . . . . . . . . . . . . . . . . 17
8.1. Client Responsibilities . . . . . . . . . . . . . . . . . 18
8.2. Proxy Responsibilities . . . . . . . . . . . . . . . . . 19
8.2.1. Denial of Service . . . . . . . . . . . . . . . . . . 19
8.2.2. Linkability Through Traffic Analysis . . . . . . . . 19
8.3. Server Responsibilities . . . . . . . . . . . . . . . . . 20
8.4. Replay Attacks . . . . . . . . . . . . . . . . . . . . . 21
8.5. Post-Compromise Security . . . . . . . . . . . . . . . . 22
9. Privacy Considerations . . . . . . . . . . . . . . . . . . . 22
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 23
11.1. Normative References . . . . . . . . . . . . . . . . . . 23
11.2. Informative References . . . . . . . . . . . . . . . . . 24
Appendix A. Complete Example of a Request and Response . . . . . 25
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 28
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 28
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