httpbis B. M. Schwartz Internet-Draft Meta Platforms, Inc. Intended status: Standards Track 20 December 2024 Expires: 23 June 2025 Template-Driven HTTP CONNECT Proxying for TCP draft-ietf-httpbis-connect-tcp-latest Abstract TCP proxying using HTTP CONNECT has long been part of the core HTTP specification. However, this proxying functionality has several important deficiencies in modern HTTP environments. This specification defines an alternative HTTP proxy service configuration for TCP connections. This configuration is described by a URI Template, similar to the CONNECT-UDP and CONNECT-IP protocols. 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 23 June 2025. Copyright Notice Copyright (c) 2024 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. Table of Contents 1. Introduction 1.1. History 1.2. Problems 1.3. Overview 2. Conventions and Definitions 3. Specification 3.1. In HTTP/1.1 3.2. In HTTP/2 and HTTP/3 3.3. Use of Other Relevant Headers 3.3.1. Origin-scoped Headers 3.3.2. Authentication Headers 3.4. Closing Connections 4. Additional Connection Setup Behaviors 4.1. Latency optimizations 4.2. Conveying metadata 5. Applicability 5.1. Servers 5.2. Clients 6. Security Considerations 7. Operational Considerations 8. IANA Considerations 8.1. New Upgrade Token 8.2. New MASQUE Default Template 8.3. New Capsule Type 9. References 9.1. Normative References 9.2. Informative References Acknowledgments Author's Address 1. Introduction 1.1. History HTTP has used the CONNECT method for proxying TCP connections since HTTP/1.1. When using CONNECT, the request target specifies a host and port number, and the proxy forwards TCP payloads between the client and this destination ([RFC9110], Section 9.3.6). To date, this is the only mechanism defined for proxying TCP over HTTP. In this specification, this is referred to as a "classic HTTP CONNECT proxy". HTTP/3 uses a UDP transport, so it cannot be forwarded using the pre- existing CONNECT mechanism. To enable forward proxying of HTTP/3, the MASQUE effort has defined proxy mechanisms that are capable of proxying UDP datagrams [CONNECT-UDP], and more generally IP datagrams [CONNECT-IP]. The destination host and port number (if applicable) are encoded into the HTTP resource path, and end-to-end datagrams are wrapped into HTTP Datagrams [RFC9297] on the client-proxy path. 1.2. Problems HTTP clients can be configured to use proxies by selecting a proxy hostname, a port, and whether to use a security protocol. However, Classic HTTP CONNECT requests using the proxy do not carry this configuration information. Instead, they only indicate the hostname and port of the target. This prevents any HTTP server from hosting multiple distinct proxy services, as the server cannot distinguish them by path (as with distinct resources) or by origin (as in "virtual hosting"). The absence of an explicit origin for the proxy also rules out the usual defenses against server port misdirection attacks (see Section 7.4 of [RFC9110]) and creates ambiguity about the use of origin-scoped response header fields (e.g., "Alt-Svc" [RFC7838], "Strict-Transport-Security" [RFC6797]). Classic HTTP CONNECT requests cannot carry in-stream metadata. For example, the WRAP_UP capsule [I-D.schinazi-httpbis-wrap-up] cannot be used with Classic HTTP CONNECT. 1.3. Overview This specification describes an alternative mechanism for proxying TCP in HTTP. Like [CONNECT-UDP] and [CONNECT-IP], the proxy service is identified by a URI Template. Proxy interactions reuse standard HTTP components and semantics, avoiding changes to the core HTTP protocol. 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. Specification A template-driven TCP transport proxy for HTTP is identified by a URI Template [RFC6570] containing variables named "target_host" and "target_port". This URI Template and its variable values MUST meet all the same requirements as for UDP proxying ([RFC9298], Section 2), and are subject to the same validation rules. The client MUST substitute the destination host and port number into this template to produce the request URI. The derived URI serves as the destination of a Capsule Protocol connection using the Upgrade Token "connect- tcp" (see registration in Section 8.1). When using "connect-tcp", TCP payload data is sent in the payload of a new Capsule Type named DATA (see registration in Section 8.3). The ordered concatenation of DATA capsule payloads represents the TCP payload data. An intermediary MAY merge and split successive DATA capsules, subject to the following requirements: * There are no intervening capsules of other types. * The order of payload content is preserved. 3.1. In HTTP/1.1 In HTTP/1.1, the client uses the proxy by issuing a request as follows: * The method SHALL be "GET". * The request's target SHALL correspond to the URI derived from expansion of the proxy's URI Template. * The request SHALL include a single "Host" header field containing the origin of the proxy. * The request SHALL include a "Connection" header field with the value "Upgrade". (Note that this requirement is case-insensitive as per Section 7.6.1 of [RFC9110].) * The request SHALL include an "Upgrade" header field with the value "connect-tcp". * The request SHOULD include a "Capsule-Protocol: ?1" header. If the request is well-formed and permissible, the proxy MUST attempt to establish the TCP connection before sending any response status code other than "100 (Continue)" (see Section 4.2). If the TCP connection is successful, the response SHALL be as follows: * The HTTP status code SHALL be "101 (Switching Protocols)". * The response SHALL include a "Connection" header field with the value "Upgrade". * The response SHALL include a single "Upgrade" header field with the value "connect-tcp". * The response SHOULD include a "Capsule-Protocol: ?1" header. If the request is malformed or impermissible, the proxy MUST return a 4XX error code. If a TCP connection was not established, the proxy MUST NOT switch protocols to "connect-tcp", and the client MAY reuse this connection for additional HTTP requests. Client Proxy GET /proxy?target_host=192.0.2.1&target_port=443 HTTP/1.1 Host: example.com Connection: Upgrade Upgrade: connect-tcp Capsule-Protocol: ?1 ** Proxy establishes a TCP connection to 192.0.2.1:443 ** HTTP/1.1 101 Switching Protocols Connection: Upgrade Upgrade: connect-tcp Capsule-Protocol: ?1 Figure 1: Templated TCP proxy example in HTTP/1.1 3.2. In HTTP/2 and HTTP/3 In HTTP/2 and HTTP/3, the proxy MUST include SETTINGS_ENABLE_CONNECT_PROTOCOL in its SETTINGS frame [RFC8441][RFC9220]. The client uses the proxy by issuing an "extended CONNECT" request as follows: * The :method pseudo-header field SHALL be "CONNECT". * The :protocol pseudo-header field SHALL be "connect-tcp". * The :authority pseudo-header field SHALL contain the authority of the proxy. * The :path and :scheme pseudo-header fields SHALL contain the path and scheme of the request URI derived from the proxy's URI Template. A templated TCP proxying request that does not conform to all of these requirements represents a client error (see [RFC9110], Section 15.5) and may be malformed (see Section 8.1.1 of [RFC9113] and Section 4.1.2 of [RFC9114]). HEADERS :method = CONNECT :scheme = https :authority = request-proxy.example :path = /proxy?target_host=2001%3Adb8%3A%3A1&target_port=443 :protocol = connect-tcp capsule-protocol = ?1 ... Figure 2: Templated TCP proxy example in HTTP/2 3.3. Use of Other Relevant Headers 3.3.1. Origin-scoped Headers Ordinary HTTP headers apply only to the single resource identified in the request or response. An origin-scoped HTTP header is a special response header that is intended to change the client's behavior for subsequent requests to any resource on this origin. Unlike classic HTTP CONNECT proxies, a templated TCP proxy has an unambiguous origin of its own. Origin-scoped headers apply to this origin when they are associated with a templated TCP proxy response. Here are some origin-scoped headers that could potentially be sent by a templated TCP proxy: * "Alt-Svc" [RFC7838] * "Strict-Transport-Security" [RFC6797] * "Public-Key-Pins" [RFC7469] * "Accept-CH" [RFC8942] * "Set-Cookie" [RFC6265], which has configurable scope. * "Clear-Site-Data" [CLEAR-SITE-DATA] 3.3.2. Authentication Headers Authentication to a templated TCP proxy normally uses ordinary HTTP authentication via the "401 (Unauthorized)" response code, the "WWW- Authenticate" response header field, and the "Authorization" request header field ([RFC9110], Section 11.6). A templated TCP proxy does not use the "407 (Proxy Authentication Required)" response code and related header fields ([RFC9110], Section 11.7) because they do not traverse HTTP gateways (see Section 7). Clients SHOULD assume that all proxy resources generated by a single template share a protection space (i.e., a realm) ([RFC9110], Section 11.5). For many authentication schemes, this will allow the client to avoid waiting for a "401 (Unauthorized)" response before each new connection through the proxy. 3.4. Closing Connections In each HTTP version, any requirements related to closing connections in Classic HTTP CONNECT also apply to "connect-tcp", with the following modifications: * In HTTP/1.1, endpoints SHOULD close the connection in an error state to indicate receipt of a TCP connection error (e.g., a TCP RST or timeout). Acceptable error states include sending an incomplete DATA capsule (as defined in Section 3.3 of [RFC9297]), a TLS Error Alert ([RFC8446], Section 6.2), or a TCP RST (if TLS is not in use). When a connection is terminated in an error state, the receiving endpoint SHOULD send a TCP RST if the underlying TCP implementation permits it. * In HTTP/2 and HTTP/3, senders MAY use an incomplete DATA capsule to indicate a TCP connection error, instead of (or in addition to) the signals defined for TCP connection errors in Classic HTTP CONNECT. Recipients MUST recognize any incomplete capsule as a TCP connection error. * Intermediaries MUST propagate connection shutdown errors, including when translating between different HTTP versions. 4. Additional Connection Setup Behaviors This section discusses some behaviors that are permitted or recommended in order to enhance the performance or functionality of connection setup. 4.1. Latency optimizations When using this specification in HTTP/2 or HTTP/3, clients MAY start sending TCP stream content optimistically, subject to flow control limits (Section 5.2 of [RFC9113] or Section 4.1 of [RFC9000]). Proxies MUST buffer this "optimistic" content until the TCP stream becomes writable, and discard it if the TCP connection fails. (Clients MUST NOT use "optimistic" behavior in HTTP/1.1, as this would interfere with reuse of the connection after an error response such as "401 (Unauthorized)".) Servers that host a proxy under this specification MAY offer support for TLS early data in accordance with [RFC8470]. Clients MAY send "connect-tcp" requests in early data, and MAY include "optimistic" TCP content in early data (in HTTP/2 and HTTP/3). At the TLS layer, proxies MAY ignore, reject, or accept the early_data extension ([RFC8446], Section 4.2.10). At the HTTP layer, proxies MAY process the request immediately, return a "425 (Too Early)" response ([RFC8470], Section 5.2), or delay some or all processing of the request until the handshake completes. For example, a proxy with limited anti-replay defenses might choose to perform DNS resolution of the target_host when a request arrives in early data, but delay the TCP connection until the TLS handshake completes. 4.2. Conveying metadata This specification supports the "Expect: 100-continue" request header ([RFC9110], Section 10.1.1) in any HTTP version. The "100 (Continue)" status code confirms receipt of a request at the proxy without waiting for the proxy-destination TCP handshake to succeed or fail. This might be particularly helpful when the destination host is not responding, as TCP handshakes can hang for several minutes before failing. Clients MAY send "Expect: 100-continue", and proxies MUST respect it by returning "100 (Continue)" if the request is not immediately rejected. Proxies implementing this specification SHOULD include a "Proxy- Status" response header [RFC9209] in any success or failure response (i.e., status codes 101, 2XX, 4XX, or 5XX) to support advanced client behaviors and diagnostics. In HTTP/2 or HTTP/3, proxies MAY additionally send a "Proxy-Status" trailer in the event of an unclean shutdown. 5. Applicability 5.1. Servers For server operators, template-driven TCP proxies are particularly valuable in situations where virtual-hosting is needed, or where multiple proxies must share an origin. For example, the proxy might benefit from sharing an HTTP gateway that provides DDoS defense, performs request sanitization, or enforces user authorization. The URI template can also be structured to generate high-entropy Capability URLs [CAPABILITY], so that only authorized users can discover the proxy service. 5.2. Clients Clients that support both classic HTTP CONNECT proxies and template- driven TCP proxies MAY accept both types via a single configuration string. If the configuration string can be parsed as a URI Template containing the required variables, it is a template-driven TCP proxy. Otherwise, it is presumed to represent a classic HTTP CONNECT proxy. In some cases, it is valuable to allow "connect-tcp" clients to reach "connect-tcp"-only proxies when using a legacy configuration method that cannot convey a URI Template. To support this arrangement, clients SHOULD treat certain errors during classic HTTP CONNECT as indications that the proxy might only support "connect-tcp": * In HTTP/1.1: the response status code is "426 (Upgrade Required)", with an "Upgrade: connect-tcp" response header. * In any HTTP version: the response status code is "501 (Not Implemented)". - Requires SETTINGS_ENABLE_CONNECT_PROTOCOL to have been negotiated in HTTP/2 or HTTP/3. If the client infers that classic HTTP CONNECT is not supported, it SHOULD retry the request using the registered default template for "connect-tcp": https://$PROXY_HOST:$PROXY_PORT/.well-known/masque /tcp/{target_host}/{target_port}/ Figure 3: Registered default template If this request succeeds, the client SHOULD record a preference for "connect-tcp" to avoid further retry delays. 6. Security Considerations Template-driven TCP proxying is largely subject to the same security risks as classic HTTP CONNECT. For example, any restrictions on authorized use of the proxy (see [RFC9110], Section 9.3.6) apply equally to both. A small additional risk is posed by the use of a URI Template parser on the client side. The template input string could be crafted to exploit any vulnerabilities in the parser implementation. Client implementers should apply their usual precautions for code that processes untrusted inputs. 7. Operational Considerations Templated TCP proxies can make use of standard HTTP gateways and path-routing to ease implementation and allow use of shared infrastructure. However, current gateways might need modifications to support TCP proxy services. To be compatible, a gateway must: * support Extended CONNECT (if acting as an HTTP/2 or HTTP/3 server). * support HTTP/1.1 Upgrade to "connect-tcp" (if acting as an HTTP/1.1 server) - only after forwarding the upgrade request to the origin and observing a success response. * forward the "connect-tcp" protocol to the origin. * convert "connect-tcp" requests between all supported HTTP server and client versions. * allow any "Proxy-Status" headers to traverse the gateway. 8. IANA Considerations 8.1. New Upgrade Token IF APPROVED, IANA is requested to add the following entry to the HTTP Upgrade Token Registry: +===============+==========================+=================+ | Value | Description | Reference | +===============+==========================+=================+ | "connect-tcp" | Proxying of TCP payloads | (This document) | +---------------+--------------------------+-----------------+ Table 1 For interoperability testing of this draft version, implementations SHALL use the value "connect-tcp-07". 8.2. New MASQUE Default Template IF APPROVED, IANA is requested to add the following entry to the "MASQUE URI Suffixes" registry: +==============+==============+=================+ | Path Segment | Description | Reference | +==============+==============+=================+ | tcp | TCP Proxying | (This document) | +--------------+--------------+-----------------+ Table 2 8.3. New Capsule Type IF APPROVED, IANA is requested to add the following entry to the "HTTP Capsule Types" registry: +=======+=========+===========+============+============+=========+ | Value | Capsule | Status | Reference | Change | Contact | | | Type | | | Controller | | +=======+=========+===========+============+============+=========+ | (TBD) | DATA | permanent | (This | IETF | HTTPBIS | | | | | document), | | | | | | | Section 3 | | | +-------+---------+-----------+------------+------------+---------+ Table 3 For this draft version of the protocol, the Capsule Type value 0x2028d7ee shall be used provisionally for testing, under the name "DATA-07". 9. References 9.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC6570] Gregorio, J., Fielding, R., Hadley, M., Nottingham, M., and D. Orchard, "URI Template", RFC 6570, DOI 10.17487/RFC6570, March 2012, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8441] McManus, P., "Bootstrapping WebSockets with HTTP/2", RFC 8441, DOI 10.17487/RFC8441, September 2018, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . [RFC8470] Thomson, M., Nottingham, M., and W. Tarreau, "Using Early Data in HTTP", RFC 8470, DOI 10.17487/RFC8470, September 2018, . [RFC9000] Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based Multiplexed and Secure Transport", RFC 9000, DOI 10.17487/RFC9000, May 2021, . [RFC9110] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke, Ed., "HTTP Semantics", STD 97, RFC 9110, DOI 10.17487/RFC9110, June 2022, . [RFC9113] Thomson, M., Ed. and C. Benfield, Ed., "HTTP/2", RFC 9113, DOI 10.17487/RFC9113, June 2022, . [RFC9114] Bishop, M., Ed., "HTTP/3", RFC 9114, DOI 10.17487/RFC9114, June 2022, . [RFC9209] Nottingham, M. and P. Sikora, "The Proxy-Status HTTP Response Header Field", RFC 9209, DOI 10.17487/RFC9209, June 2022, . [RFC9220] Hamilton, R., "Bootstrapping WebSockets with HTTP/3", RFC 9220, DOI 10.17487/RFC9220, June 2022, . [RFC9297] Schinazi, D. and L. Pardue, "HTTP Datagrams and the Capsule Protocol", RFC 9297, DOI 10.17487/RFC9297, August 2022, . [RFC9298] Schinazi, D., "Proxying UDP in HTTP", RFC 9298, DOI 10.17487/RFC9298, August 2022, . 9.2. Informative References [CAPABILITY] "Good Practices for Capability URLs", February 2014, . [CLEAR-SITE-DATA] "Clear Site Data", November 2017, . [CONNECT-IP] Pauly, T., Ed., Schinazi, D., Chernyakhovsky, A., Kühlewind, M., and M. Westerlund, "Proxying IP in HTTP", RFC 9484, DOI 10.17487/RFC9484, October 2023, . [CONNECT-UDP] Schinazi, D., "Proxying UDP in HTTP", RFC 9298, DOI 10.17487/RFC9298, August 2022, . [I-D.schinazi-httpbis-wrap-up] Schinazi, D. and L. Pardue, "The HTTP Wrap Up Capsule", Work in Progress, Internet-Draft, draft-schinazi-httpbis- wrap-up-01, 16 October 2024, . [RFC6265] Barth, A., "HTTP State Management Mechanism", RFC 6265, DOI 10.17487/RFC6265, April 2011, . [RFC6797] Hodges, J., Jackson, C., and A. Barth, "HTTP Strict Transport Security (HSTS)", RFC 6797, DOI 10.17487/RFC6797, November 2012, . [RFC7469] Evans, C., Palmer, C., and R. Sleevi, "Public Key Pinning Extension for HTTP", RFC 7469, DOI 10.17487/RFC7469, April 2015, . [RFC7838] Nottingham, M., McManus, P., and J. Reschke, "HTTP Alternative Services", RFC 7838, DOI 10.17487/RFC7838, April 2016, . [RFC8942] Grigorik, I. and Y. Weiss, "HTTP Client Hints", RFC 8942, DOI 10.17487/RFC8942, February 2021, . Acknowledgments Thanks to Amos Jeffries, Tommy Pauly, Kyle Nekritz, David Schinazi, and Kazuho Oku for close review and suggested changes. Author's Address Benjamin M. Schwartz Meta Platforms, Inc. Email: ietf@bemasc.net