Internet-Draft | HTTP Access Descriptions | October 2022 |
Schwartz | Expires 21 April 2023 | [Page] |
- Workgroup:
- Multiplexed Application Substrate over QUIC Encryption
- Internet-Draft:
- draft-schwartz-masque-access-descriptions-03
- Published:
- Intended Status:
- Standards Track
- Expires:
HTTP Access Service Description Objects
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
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 21 April 2023.¶
Copyright Notice
Copyright (c) 2022 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 (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.¶
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, allowing distinct instances of the same service type to be served by a single origin. These services include:¶
- DNS over HTTPS [RFC8484]¶
- CONNECT-UDP [RFC9298]¶
- CONNECT-IP [I-D.draft-ietf-masque-connect-ip]¶
- Modern HTTP Proxies [I-D.draft-schwartz-modern-http-proxies]¶
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.¶
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 7). Inclusion of each key is OPTIONAL. The corresponding media type is application/access-services+json
.¶
The initially defined keys are "http", tcp", "dns", "udp", and "ip". Each of these keys holds a JSON dictionary containing the key "template" with a value that is a URI template suitable for configuring a Modern HTTP proxy, Modern TCP Transport Proxy, DNS over HTTPS, CONNECT-UDP, or CONNECT-IP, respectively. (Future keys might hold other JSON types.)¶
If the Access Description is for a general-purpose proxy, all proxy targets are presumed to be supported. Otherwise, the supported targets must be understood from context.¶
4. Client Authentication
General-purpose clients of this specification SHOULD also implement support for Popup Authentication [I-D.draft-schwartz-httpapi-popup-authentication] when fetching the Access Description. If Popup Authentication produced any Authorization or Cookie headers for the Access Description, the client MUST also apply those headers to any HTTP requests made using the included templates (subject to proxy-specific modifications, see Section 4.3 of [I-D.draft-schwartz-httpapi-popup-authentication]). These headers are applied even if the Access Description and the included services are on different HTTP origins.¶
This arrangement allows the use of Access Descriptions to describe access-controlled services, and avoids asking the user to authenticate separately with each service.¶
5. 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/access-services+json".¶
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.¶
6. Security Considerations
TODO Security¶
7. IANA Considerations
IANA is requested to open a Specification Required registry entitled "HTTP Access Service Descriptors", with the following initial contents:¶
Key | Specification |
---|---|
http | (This document) |
tcp | (This document) |
dns | (This document) |
udp | (This document) |
ip | (This document) |
IANA is requested to add the following entry to the "Well-Known URIs" registry:¶
URI Suffix | Change Controller | Reference | Status | Related Information |
---|---|---|---|---|
access-services | IETF | (This document) | provisional | Sub-registry at (link) |
IANA is requested to add the following entry to the "application" sub-registry of the "Media Types" registry:¶
Name | Template | Reference |
---|---|---|
access-services+json | application/access-services+json | (This document) |
-
TODO: Full registration template for this Media Type.¶
8. Normative References
- [I-D.draft-ietf-masque-connect-ip]
- Pauly, T., Schinazi, D., Chernyakhovsky, A., Kühlewind, M., and M. Westerlund, "IP Proxying Support for HTTP", Work in Progress, Internet-Draft, draft-ietf-masque-connect-ip-03, , <https://datatracker.ietf.org/doc/html/draft-ietf-masque-connect-ip-03>.
- [I-D.draft-schwartz-httpapi-popup-authentication]
- Schwartz, B. M., "Interactive Authentication of Non-Interactive HTTP Requests", Work in Progress, Internet-Draft, draft-schwartz-httpapi-popup-authentication-00, , <https://datatracker.ietf.org/doc/html/draft-schwartz-httpapi-popup-authentication-00>.
- [I-D.draft-schwartz-modern-http-proxies]
- Schwartz, B. M., "Modernizing HTTP Forward Proxy Functionality", Work in Progress, Internet-Draft, draft-schwartz-modern-http-proxies-00, , <https://datatracker.ietf.org/doc/html/draft-schwartz-modern-http-proxies-00>.
- [RFC2119]
- Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <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, , <https://www.rfc-editor.org/rfc/rfc8174>.
- [RFC8484]
- Hoffman, P. and P. McManus, "DNS Queries over HTTPS (DoH)", RFC 8484, DOI 10.17487/RFC8484, , <https://www.rfc-editor.org/rfc/rfc8484>.
- [RFC9298]
- Schinazi, D., "Proxying UDP in HTTP", RFC 9298, DOI 10.17487/RFC9298, , <https://www.rfc-editor.org/rfc/rfc9298>.
Acknowledgments
TODO acknowledge.¶