Multiplexed Application Substrate over QUIC Encryption B. M. Schwartz
Internet-Draft Google LLC
Intended status: Standards Track 7 April 2022
Expires: 9 October 2022
HTTP Access Service Description Objects
draft-schwartz-masque-access-descriptions-00
Abstract
HTTP proxies can operate several different kinds of access services.
This specification provides a format for identifying a collection of
such services.
About This Document
This note is to be removed before publishing as an RFC.
Status information for this document may be found at
https://datatracker.ietf.org/doc/draft-schwartz-masque-access-
descriptions/.
Source for this draft and an issue tracker can be found at
https://github.com/bemasc/access-services.
Status of This Memo
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Copyright Notice
Copyright (c) 2022 IETF Trust and the persons identified as the
document authors. All rights reserved.
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Internet-Draft HTTP Access Service Descriptions April 2022
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 3
3. Format . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. Examples . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Discovery from an Origin . . . . . . . . . . . . . . . . . . 4
5. Security Considerations . . . . . . . . . . . . . . . . . . . 5
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
7. Normative References . . . . . . . . . . . . . . . . . . . . 5
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 6
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 6
1. Introduction
In HTTP/1.1, forward proxy service was originally defined in two
ways: absolute-uri request form (encrypted at most hop-by-hop), and
HTTP CONNECT (potentially encrypted end-to-end). Both of these
services were effectively origin-scoped: the access service was a
property of the origin, not associated with any particular path.
Recently, a variety of new standardized proxy-like services have
emerged for HTTP. These new services are defined by a URI template
or path, allowing distinct instances of the same service type to be
served by a single origin. These services include:
* DNS over HTTPS [RFC8484]
* CONNECT-UDP [I-D.draft-ietf-masque-connect-udp]
* CONNECT-IP [I-D.draft-ietf-masque-connect-ip]
* Oblivious HTTP [I-D.draft-ietf-ohai-ohttp]
This specification provides a unified format for describing a
collection of such access services, and a mechanism for reaching such
services when the initial information contains only an HTTP origin.
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2. Conventions and Definitions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in
BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here.
3. Format
An access service collection is defined by a JSON dictionary
containing keys specified in the corresponding registry (Section 6).
Inclusion of each key is OPTIONAL.
The "dns", "udp", and "ip" keys are each defined to hold a JSON
dictionary containing the key "template" with a value that is a URI
template suitable for configuring DNS over HTTPS, CONNECT-UDP, or
CONNECT-IP, respectively.
The "ohttp" key contains a dictionary with either or both of these
keys:
* "proxy", containing a dictionary with a "template" key indicating
the Oblivious Proxy's resource mapping. The template MUST contain
a "request_uri" variable indicating the Oblivious Request
Resource.
* "request", containing a dictionary with a "uri" key indicating the
Oblivious Request Resource and a "key" key conveying its KeyConfig
in base64.
If the Access Description is for a general-purpose proxy, all
Oblivious Request Resources and Targets (respectively) are presumed
to be supported; otherwise the supported Resources and Targets must
be understood from context (but see Section 4).
3.1. Examples
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{
"dns": {
"template": "https://doh.example.com/dns-query{?dns}",
},
"udp": {
"template":
"https://proxy.example.org/masque{?target_host,target_port}"
},
"ip": {
"template": "https://proxy.example.org/masque{?target,ip_proto}"
},
"ohttp": {
"proxy": {
"template": "https://proxy.example.org/ohttp{?request_uri}"
}
}
}
Figure 1: A proxy with UDP, IP, DNS, and Oblivious HTTP support
{
"dns": {
"template": "https://doh.example.com/dns-query{?dns}",
},
"ohttp": {
"request": {
"uri": "https://example.com/ohttp/",
"key": "(KeyConfig in Base64)"
}
}
}
Figure 2: An Oblivious DNS over HTTPS service
4. Discovery from an Origin
In cases where the HTTP access service is identified only by an
origin (e.g. when configured as a Secure Web Proxy), operators can
publish an associated access service collection at the path "/.well-
known/access-services", with the Content-Type "application/json".
When the "ohttp.request" URI appears in an Access Description at this
location, all URIs on this origin (except the Oblivious Request URI)
are presumed to be reachable as Oblivious Request Targets.
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Clients MAY fetch this Access Description and use the indicated
services (in addition to any origin-scoped services) automatically.
Clients SHOULD use the description only while it is fresh according
to its HTTP cache lifetime, refreshing it as needed.
5. Security Considerations
TODO Security
6. IANA Considerations
IANA is requested to open a Specification Required registry entitled
"HTTP Access Service Descriptors", with the following initial
contents:
+=======+=================+
| Key | Specification |
+=======+=================+
| dns | (This document) |
+-------+-----------------+
| udp | (This document) |
+-------+-----------------+
| ip | (This document) |
+-------+-----------------+
| ohttp | (This document) |
+-------+-----------------+
Table 1
IANA is requested to add the following entry to the "Well-Known URIs"
registry
+=================+==========+=========+=============+==============+
| URI Suffix |Change |Reference| Status | Related |
| |Controller| | | Information |
+=================+==========+=========+=============+==============+
| access-services |IETF |(This | provisional | Sub-registry |
| | |document)| | at (link) |
+-----------------+----------+---------+-------------+--------------+
Table 2
7. Normative References
[I-D.draft-ietf-masque-connect-ip]
Pauly, T., Schinazi, D., Chernyakhovsky, A., Kuehlewind,
M., and M. Westerlund, "IP Proxying Support for HTTP",
Work in Progress, Internet-Draft, draft-ietf-masque-
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connect-ip-01, 4 March 2022,
<https://datatracker.ietf.org/doc/html/draft-ietf-masque-
connect-ip-01>.
[I-D.draft-ietf-masque-connect-udp]
Schinazi, D., "UDP Proxying Support for HTTP", Work in
Progress, Internet-Draft, draft-ietf-masque-connect-udp-
08, 21 March 2022, <https://datatracker.ietf.org/doc/html/
draft-ietf-masque-connect-udp-08>.
[I-D.draft-ietf-ohai-ohttp]
Thomson, M. and C. A. Wood, "Oblivious HTTP", Work in
Progress, Internet-Draft, draft-ietf-ohai-ohttp-01, 15
February 2022, <https://datatracker.ietf.org/doc/html/
draft-ietf-ohai-ohttp-01>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.
[RFC8484] Hoffman, P. and P. McManus, "DNS Queries over HTTPS
(DoH)", RFC 8484, DOI 10.17487/RFC8484, October 2018,
<https://www.rfc-editor.org/rfc/rfc8484>.
Acknowledgments
TODO acknowledge.
Author's Address
Benjamin M. Schwartz
Google LLC
Email: bemasc@google.com
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