--- 1/draft-ietf-quic-v2-00.txt 2022-01-21 17:13:10.012502390 -0800 +++ 2/draft-ietf-quic-v2-01.txt 2022-01-21 17:13:10.044503205 -0800 @@ -1,89 +1,120 @@ QUIC M. Duke -Internet-Draft F5, Inc. -Intended status: Standards Track 22 November 2021 -Expires: 26 May 2022 +Internet-Draft Google LLC +Intended status: Standards Track 22 January 2022 +Expires: 26 July 2022 QUIC Version 2 - draft-ietf-quic-v2-00 + draft-ietf-quic-v2-01 Abstract This document specifies QUIC version 2, which is identical to QUIC version 1 except for some trivial details. Its purpose is to combat various ossification vectors and exercise the version negotiation framework. It also serves as a template for the minimum changes in any future version of QUIC. Note that "version 2" is an informal name for this proposal that indicates it is the second standards-track QUIC version. The protocol specified here will receive a version number other than 2 from IANA. Discussion of this work is encouraged to happen on the QUIC IETF mailing list quic@ietf.org or on the GitHub repository which contains the draft: https://github.com/quicwg/quic-v2. +About This Document + + This note is to be removed before publishing as an RFC. + + The latest revision of this draft can be found at https://quicwg.org/ + quic-v2/draft-ietf-quic-v2.html. Status information for this + document may be found at https://datatracker.ietf.org/doc/draft-ietf- + quic-v2/. + + Discussion of this document takes place on the QUIC Working Group + mailing list (mailto:quic@ietf.org), which is archived at + https://mailarchive.ietf.org/arch/browse/quic/. + + Source for this draft and an issue tracker can be found at + https://github.com/quicwg/quic-v2. + 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 26 May 2022. + This Internet-Draft will expire on 26 July 2022. Copyright Notice - Copyright (c) 2021 IETF Trust and the persons identified as the + 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. Table of Contents - 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 - 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 3 - 3. Changes from QUIC Version 1 . . . . . . . . . . . . . . . . . 3 - 4. Version Negotiation Considerations . . . . . . . . . . . . . 4 - 5. Ossification Considerations . . . . . . . . . . . . . . . . . 4 - 6. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 4 - 7. Security Considerations . . . . . . . . . . . . . . . . . . . 5 - 8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5 - 9. References . . . . . . . . . . . . . . . . . . . . . . . . . 5 - 9.1. Normative References . . . . . . . . . . . . . . . . . . 5 - 9.2. Informative References . . . . . . . . . . . . . . . . . 5 - Appendix A. Changelog . . . . . . . . . . . . . . . . . . . . . 6 - A.1. since draft-duke-quic-v2-02 . . . . . . . . . . . . . . . 6 - A.2. since draft-duke-quic-v2-01 . . . . . . . . . . . . . . . 6 - A.3. since draft-duke-quic-v2-00 . . . . . . . . . . . . . . . 6 - Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 7 + 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 + 2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 4 + 3. Changes from QUIC Version 1 . . . . . . . . . . . . . . . . . 4 + 3.1. Version Field . . . . . . . . . . . . . . . . . . . . . . 4 + 3.2. Long Header Packet Types . . . . . . . . . . . . . . . . 4 + 3.3. Cryptography changes . . . . . . . . . . . . . . . . . . 4 + 3.3.1. Initial Salt . . . . . . . . . . . . . . . . . . . . 4 + 3.3.2. HKDF Labels . . . . . . . . . . . . . . . . . . . . . 4 + 3.3.3. Retry Integrity Tag . . . . . . . . . . . . . . . . . 4 + 4. Version Negotiation Considerations . . . . . . . . . . . . . 5 + 4.1. Compatible Negotiation Requirements . . . . . . . . . . . 5 + 5. TLS Resumption . . . . . . . . . . . . . . . . . . . . . . . 6 + 6. Ossification Considerations . . . . . . . . . . . . . . . . . 7 + 7. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 7 + 8. Security Considerations . . . . . . . . . . . . . . . . . . . 7 + 9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 + 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 8 + 10.1. Normative References . . . . . . . . . . . . . . . . . . 8 + 10.2. Informative References . . . . . . . . . . . . . . . . . 8 + Appendix A. Sample Packet Protection . . . . . . . . . . . . . . 9 + A.1. Keys . . . . . . . . . . . . . . . . . . . . . . . . . . 9 + A.2. Client Initial . . . . . . . . . . . . . . . . . . . . . 10 + A.3. Server Initial . . . . . . . . . . . . . . . . . . . . . 12 + A.4. Retry . . . . . . . . . . . . . . . . . . . . . . . . . . 13 + A.5. ChaCha20-Poly1305 Short Header Packet . . . . . . . . . . 13 + Appendix B. Changelog . . . . . . . . . . . . . . . . . . . . . 15 + B.1. since draft-ietf-quic-v2-00 . . . . . . . . . . . . . . . 15 + B.2. since draft-duke-quic-v2-02 . . . . . . . . . . . . . . . 15 + B.3. since draft-duke-quic-v2-01 . . . . . . . . . . . . . . . 15 + B.4. since draft-duke-quic-v2-00 . . . . . . . . . . . . . . . 15 + Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 15 1. Introduction - QUIC [RFC9000] has numerous extension points, including the version + QUIC [QUIC] has numerous extension points, including the version number that occupies the second through fifth octets of every long header (see [RFC8999]). If experimental versions are rare, and QUIC version 1 constitutes the vast majority of QUIC traffic, there is the potential for middleboxes to ossify on the version octets always being 0x00000001. Furthermore, version 1 Initial packets are encrypted with keys derived from a universally known salt, which allow observers to inspect the contents of these packets, which include the TLS Client Hello and Server Hello messages. Again, middleboxes may ossify on @@ -111,181 +142,518 @@ 2. Conventions The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 3. Changes from QUIC Version 1 QUIC version 2 endpoints MUST implement the QUIC version 1 - specification as described in [RFC9000], [RFC9001], and [RFC9002], - with the following changes: + specification as described in [QUIC], [QUIC-TLS], and [RFC9002], with + the following changes. - * The version field of long headers is TBD. Note: Unless this - document is published as an RFC, implementations should use the - provisional value 0xff020000, which might change with each edition - of this document. +3.1. Version Field - * The salt used to derive Initial keys in Sec 5.2 of [RFC9001] - changes to + The version field of long headers is 0x709a50c4. + +3.2. Long Header Packet Types + + Initial packets use a packet type field of 0b01. 0-RTT packets use a + packet type field of 0b10. Handshake packets use a packet type field + of 0b11. Retry packets use a packet type field of 0b00. + +3.3. Cryptography changes + +3.3.1. Initial Salt + + The salt used to derive Initial keys in Section 5.2 of [QUIC-TLS] + changes to: initial_salt = 0xa707c203a59b47184a1d62ca570406ea7ae3e5d3 - * The labels used in [RFC9001] to derive packet protection keys (Sec - 5.1), header protection keys (Sec 5.4), Retry Integrity Tag keys - (Sec 5.8), and key updates (Sec 6.1) change from "quic key" to - "quicv2 key", from "quic iv" to "quicv2 iv", from "quic hp" to - "quicv2 hp", and from "quic ku" to "quicv2 ku," to meet the +3.3.2. HKDF Labels + + The labels used in [QUIC-TLS] to derive packet protection keys + (Section 5.1), header protection keys (Section 5.4), Retry Integrity + Tag keys (Section 5.8), and key updates (Section 6.1) change from + "quic key" to "quicv2 key", from "quic iv" to "quicv2 iv", from "quic + hp" to "quicv2 hp", and from "quic ku" to "quicv2 ku", to meet the guidance for new versions in Section 9.6 of that document. - * The key and nonce used for the Retry Integrity Tag (Sec 5.8 of - [RFC9001]) change to: +3.3.3. Retry Integrity Tag -secret = 0x3425c20cf88779df2ff71e8abfa78249891e763bbed2f13c048343d348c060e2 + The key and nonce used for the Retry Integrity Tag (Section 5.8 of + [QUIC-TLS]) change to: + + secret = + 0x3425c20cf88779df2ff71e8abfa78249891e763bbed2f13c048343d348c060e2 key = 0xba858dc7b43de5dbf87617ff4ab253db nonce = 0x141b99c239b03e785d6a2e9f 4. Version Negotiation Considerations - QUIC version 2 endpoints SHOULD also support QUIC version 1. Any - QUIC endpoint that supports multiple versions MUST fully implement - [QUIC-VN] to prevent version downgrade attacks. + QUIC version 2 is not intended to deprecate version 1. Endpoints + that support version 2 might continue support for version 1 to + maximize compatibility with clients. In particular, HTTP clients + often use Alt-Svc [RFC7838] to discover QUIC support. As this + mechanism does not currently distinguish between QUIC versions, HTTP + servers that support multiple versions reduce the probability of + incompatibility and the cost associated with QUIC version negotiation + or TCP fallback. For example, an origin advertising support for "h3" + in Alt-Svc SHOULD support QUIC version 1 as it was the original QUIC + version used by HTTP/3 and therefore some clients will only support + that version. + + Any QUIC endpoint that supports multiple versions MUST meet the + minimum requirements described in [QUIC-VN] to prevent version + downgrade attacks. Note that version 2 meets that document's definition of a compatible - version with version 1. Therefore, v2-capable servers MUST use - compatible version negotiation unless they do not support version 1. + version with version 1. Therefore, servers can use compatible + negotiation to switch a connection between the two versions. + Endpoints that support both versions SHOULD support compatible + version negotiation to avoid a round trip. - As version 1 support is more likely than version 2 support, a client - SHOULD use QUIC version 1 for its original version unless it has out- - of-band knowledge that the server supports version 2. +4.1. Compatible Negotiation Requirements -5. Ossification Considerations + Compatible version negotiation between versions 1 and 2 follow the + same requirements in either direction. This section uses the terms + "original version" and "negotiated version" from [QUIC-VN]. + + If the server sends a Retry packet, it MUST use the original version. + The client ignores Retry packets using other versions. The client + MUST NOT use a different version in the subsequent Initial that + contains the Retry token. The server MAY encode the QUIC version in + its Retry token to validate that the client did not switch versions, + and drop the packet if it switched. + + QUIC version 2 uses the same transport parameters to authenticate the + Retry as QUIC version 1. After switching to a negotiated version + after a Retry, the server MUST include the relevant transport + parameters to validate that the server sent the Retry and the + connection IDs used in the exchange, as described in Section 7.3 of + [QUIC]. Note that the version of the first Initial and the + subsequent Retry are not authenticated by transport parameters. + + The server SHOULD start sending its Initial packets using the + negotiated version as soon as it decides to change. Before the + server is able to process transport parameters from the client, it + might need to respond to Initial packets from the client. For these + packets the server uses the original version. + + Once the client has processed a packet using the negotiated version, + it SHOULD send subsequent Initial packets using that version. The + server MUST NOT discard its original version Initial receive keys + until it successfully processes a packet with the negotiated version. + + Both endpoints MUST send Handshake or 1-RTT packets using the + negotiated version. An endpoint MUST drop packets using any other + version. Endpoints have no need to generate the keying material that + would allow them to decrypt or authenticate these packets. + + If the server's version_information transport parameter does not + contain a Chosen Version field equivalent to the version in the + server's Handshake packet headers, the client MUST terminate the + connection with a VERSION_NEGOTIATION_ERROR. + + The client MUST NOT send 0-RTT packets using the negotiated version, + even after processing a packet of that version from the server. + Servers can apply original version 0-RTT packets to a connection + without additional considerations. + +5. TLS Resumption + + TLS session tickets are specific to the QUIC version of the + connection that provided them. Clients MUST NOT use a session ticket + from a QUICv1 connection to initiate a QUICv2 connection, or vice + versa. + + Servers SHOULD validate the originating version of any session ticket + and not resume from any ticket issued from a different version. This + results in falling back to a full TLS handshake, without 0-RTT. + + After compatible version negotiation, any resulting session ticket + maps to the negotiated version rather than original one. + +6. Ossification Considerations QUIC version 2 provides protection against some forms of ossification. Devices that assume that all long headers will contain encode version 1, or that the version 1 Initial key derivation formula will remain version-invariant, will not correctly process version 2 packets. However, many middleboxes such as firewalls focus on the first packet in a connection, which will often remain in the version 1 format due to the considerations above. Clients interested in combating firewall ossification can initiate a connection using version 2 if they are either reasonably certain the server supports it, or are willing to suffer a round-trip penalty if they are incorrect. -6. Applicability +7. Applicability This version of QUIC provides no change from QUIC version 1 relating to the capabilities available to applications. Therefore, all Application Layer Protocol Negotiation (ALPN) ([RFC7301]) codepoints specified to operate over QUICv1 can also operate over this version of QUIC. All QUIC extensions defined to work with version 1 also work with version 2. -7. Security Considerations +8. Security Considerations QUIC version 2 introduces no changes to the security or privacy properties of QUIC version 1. The mandatory version negotiation mechanism guards against downgrade attacks, but downgrades have no security implications, as the version properties are identical. -8. IANA Considerations +9. IANA Considerations This document requests that IANA add the following entry to the QUIC version registry: - Value: TBD + Value: 0x709a50c4 - Status: permanent + Status: provisional Specification: This Document - Change Controller: IETF Contact: QUIC WG -9. References - -9.1. Normative References +10. References - [QUIC-VN] Schinazi, D. and E. Rescorla, "Compatible Version - Negotiation for QUIC", Work in Progress, Internet-Draft, - draft-ietf-quic-version-negotiation-05, 25 October 2021, - . +10.1. Normative References - [RFC9000] Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based + [QUIC] Iyengar, J., Ed. and M. Thomson, Ed., "QUIC: A UDP-Based Multiplexed and Secure Transport", RFC 9000, DOI 10.17487/RFC9000, May 2021, - . + . - [RFC9001] Thomson, M., Ed. and S. Turner, Ed., "Using TLS to Secure + [QUIC-TLS] Thomson, M., Ed. and S. Turner, Ed., "Using TLS to Secure QUIC", RFC 9001, DOI 10.17487/RFC9001, May 2021, - . + . + + [QUIC-VN] Schinazi, D. and E. Rescorla, "Compatible Version + Negotiation for QUIC", Work in Progress, Internet-Draft, + draft-ietf-quic-version-negotiation-05, 25 October 2021, + . [RFC9002] Iyengar, J., Ed. and I. Swett, Ed., "QUIC Loss Detection and Congestion Control", RFC 9002, DOI 10.17487/RFC9002, - May 2021, . + May 2021, . -9.2. Informative References +10.2. Informative References [I-D.duke-quic-version-aliasing] Duke, M., "QUIC Version Aliasing", Work in Progress, Internet-Draft, draft-duke-quic-version-aliasing-07, 25 - October 2021, . + October 2021, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, - . + . [RFC7301] Friedl, S., Popov, A., Langley, A., and E. Stephan, "Transport Layer Security (TLS) Application-Layer Protocol Negotiation Extension", RFC 7301, DOI 10.17487/RFC7301, - July 2014, . + July 2014, . + + [RFC7838] Nottingham, M., McManus, P., and J. Reschke, "HTTP + Alternative Services", RFC 7838, DOI 10.17487/RFC7838, + April 2016, . [RFC8999] Thomson, M., "Version-Independent Properties of QUIC", RFC 8999, DOI 10.17487/RFC8999, May 2021, - . + . -Appendix A. Changelog +Appendix A. Sample Packet Protection + + This section shows examples of packet protection so that + implementations can be verified incrementally. Samples of Initial + packets from both client and server plus a Retry packet are defined. + These packets use an 8-byte client-chosen Destination Connection ID + of 0x8394c8f03e515708. Some intermediate values are included. All + values are shown in hexadecimal. + +A.1. Keys + + The labels generated during the execution of the HKDF-Expand-Label + function (that is, HkdfLabel.label) and part of the value given to + the HKDF-Expand function in order to produce its output are: + + client in: 00200f746c73313320636c69656e7420696e00 + + server in: 00200f746c7331332073657276657220696e00 + + quicv2 key: 001010746c73313320717569637632206b657900 + + quicv2 iv: 000c0f746c7331332071756963763220697600 + + quicv2 hp: 00100f746c7331332071756963763220687000 + + The initial secret is common: + + initial_secret = HKDF-Extract(initial_salt, cid) + = ddfcb7b82a430b7845210ad64b406977 + ed51b269a14bc69aa9ea9b366fa3b06b + + The secrets for protecting client packets are: + + client_initial_secret + = HKDF-Expand-Label(initial_secret, "client in", "", 32) + = 9fe72e1452e91f551b770005054034e4 + 7575d4a0fb4c27b7c6cb303a338423ae + + key = HKDF-Expand-Label(client_initial_secret, "quicv2 key", "", 16) + = 95df2be2e8d549c82e996fc9339f4563 + + iv = HKDF-Expand-Label(client_initial_secret, "quicv2 iv", "", 12) + = ea5e3c95f933db14b7020ad8 + + hp = HKDF-Expand-Label(client_initial_secret, "quicv2 hp", "", 16) + = 091efb735702447d07908f6501845794 + + The secrets for protecting server packets are: + + server_initial_secret + = HKDF-Expand-Label(initial_secret, "server in", "", 32) + = 3c9bf6a9c1c8c71819876967bd8b979e + fd98ec665edf27f22c06e9845ba0ae2f + + key = HKDF-Expand-Label(server_initial_secret, "quicv2 key", "", 16) + = 15d5b4d9a2b8916aa39b1bfe574d2aad + + iv = HKDF-Expand-Label(server_initial_secret, "quicv2 iv", "", 12) + = a85e7ac31cd275cbb095c626 + + hp = HKDF-Expand-Label(server_initial_secret, "quicv2 hp", "", 16) + = b13861cfadbb9d11ff942dd80c8fc33b + +A.2. Client Initial + + The client sends an Initial packet. The unprotected payload of this + packet contains the following CRYPTO frame, plus enough PADDING + frames to make a 1162-byte payload: + + 060040f1010000ed0303ebf8fa56f129 39b9584a3896472ec40bb863cfd3e868 + 04fe3a47f06a2b69484c000004130113 02010000c000000010000e00000b6578 + 616d706c652e636f6dff01000100000a 00080006001d00170018001000070005 + 04616c706e0005000501000000000033 00260024001d00209370b2c9caa47fba + baf4559fedba753de171fa71f50f1ce1 5d43e994ec74d748002b000302030400 + 0d0010000e0403050306030203080408 050806002d00020101001c0002400100 + 3900320408ffffffffffffffff050480 00ffff07048000ffff08011001048000 + 75300901100f088394c8f03e51570806 048000ffff + + The unprotected header indicates a length of 1182 bytes: the 4-byte + packet number, 1162 bytes of frames, and the 16-byte authentication + tag. The header includes the connection ID and a packet number of 2: + + d3709a50c4088394c8f03e5157080000449e00000002 + + Protecting the payload produces output that is sampled for header + protection. Because the header uses a 4-byte packet number encoding, + the first 16 bytes of the protected payload is sampled and then + applied to the header as follows: + + sample = 23b8e610589c83c92d0e97eb7a6e5003 + + mask = AES-ECB(hp, sample)[0..4] + = 8e4391d84a + + header[0] ^= mask[0] & 0x0f + = dd + header[18..21] ^= mask[1..4] + = 4391d848 + header = dd709a50c4088394c8f03e5157080000449e4391d848 + + The resulting protected packet is: + + dd709a50c4088394c8f03e5157080000 449e4391d84823b8e610589c83c92d0e + 97eb7a6e5003f57764c5c7f0095ba54b 90818f1bfeecc1c97c54fc731edbd2a2 + 44e3b1e639a9bc75ed545b98649343b2 53615ec6b3e4df0fd2e7fe9d691a09e6 + a144b436d8a2c088a404262340dfd995 ec3865694e3026ecd8c6d2561a5a3667 + 2a1005018168c0f081c10e2bf14d550c 977e28bb9a759c57d0f7ffb1cdfb40bd + 774dec589657542047dffefa56fc8089 a4d1ef379c81ba3df71a05ddc7928340 + 775910feb3ce4cbcfd8d253edd05f161 458f9dc44bea017c3117cca7065a315d + eda9464e672ec80c3f79ac993437b441 ef74227ecc4dc9d597f66ab0ab8d214b + 55840c70349d7616cbe38e5e1d052d07 f1fedb3dd3c4d8ce295724945e67ed2e + efcd9fb52472387f318e3d9d233be7df c79d6bf6080dcbbb41feb180d7858849 + 7c3e439d38c334748d2b56fd19ab364d 057a9bd5a699ae145d7fdbc8f5777518 + 1b0a97c3bdedc91a555d6c9b8634e106 d8c9ca45a9d5450a7679edc545da9102 + 5bc93a7cf9a023a066ffadb9717ffaf3 414c3b646b5738b3cc4116502d18d79d + 8227436306d9b2b3afc6c785ce3c817f eb703a42b9c83b59f0dcef1245d0b3e4 + 0299821ec19549ce489714fe2611e72c d882f4f70dce7d3671296fc045af5c9f + 630d7b49a3eb821bbca60f1984dce664 91713bfe06001a56f51bb3abe92f7960 + 547c4d0a70f4a962b3f05dc25a34bbe8 30a7ea4736d3b0161723500d82beda9b + e3327af2aa413821ff678b2a876ec4b0 0bb605ffcc3917ffdc279f187daa2fce + 8cde121980bba8ec8f44ca562b0f1319 14c901cfbd847408b778e6738c7bb5b1 + b3f97d01b0a24dcca40e3bed29411b1b a8f60843c4a241021b23132b9500509b + 9a3516d4a9dd41d3bacbcd426b451393 521828afedcf20fa46ac24f44a8e2973 + 30b16705d5d5f798eff9e9134a065979 87a1db4617caa2d93837730829d4d89e + 16413be4d8a8a38a7e6226623b64a820 178ec3a66954e10710e043ae73dd3fb2 + 715a0525a46343fb7590e5eac7ee55fc 810e0d8b4b8f7be82cd5a214575a1b99 + 629d47a9b281b61348c8627cab38e2a6 4db6626e97bb8f77bdcb0fee476aedd7 + ba8f5441acaab00f4432edab3791047d 9091b2a753f035648431f6d12f7d6a68 + 1e64c861f4ac911a0f7d6ec0491a78c9 f192f96b3a5e7560a3f056bc1ca85983 + 67ad6acb6f2e034c7f37beeb9ed470c4 304af0107f0eb919be36a86f68f37fa6 + 1dae7aff14decd67ec3157a11488a14f ed0142828348f5f608b0fe03e1f3c0af + 3acca0ce36852ed42e220ae9abf8f890 6f00f1b86bff8504c8f16c784fd52d25 + e013ff4fda903e9e1eb453c1464b1196 6db9b28e8f26a3fc419e6a60a48d4c72 + 14ee9c6c6a12b68a32cac8f61580c64f 29cb6922408783c6d12e725b014fe485 + cd17e484c5952bf99bc94941d4b1919d 04317b8aa1bd3754ecbaa10ec227de85 + 40695bf2fb8ee56f6dc526ef366625b9 1aa4970b6ffa5c8284b9b5ab852b905f + 9d83f5669c0535bc377bcc05ad5e48e2 81ec0e1917ca3c6a471f8da0894bc82a + c2a8965405d6eef3b5e293a88fda203f 09bdc72757b107ab14880eaa3ef7045b + 580f4821ce6dd325b5a90655d8c5b55f 76fb846279a9b518c5e9b9a21165c509 + 3ed49baaacadf1f21873266c767f6769 + +A.3. Server Initial + + The server sends the following payload in response, including an ACK + frame, a CRYPTO frame, and no PADDING frames: + + 02000000000600405a020000560303ee fce7f7b37ba1d1632e96677825ddf739 + 88cfc79825df566dc5430b9a045a1200 130100002e00330024001d00209d3c94 + 0d89690b84d08a60993c144eca684d10 81287c834d5311bcf32bb9da1a002b00 + 020304 + The header from the server includes a new connection ID and a 2-byte + packet number encoding for a packet number of 1: + + d1709a50c40008f067a5502a4262b50040750001 + + As a result, after protection, the header protection sample is taken + starting from the third protected byte: + + sample = ebb7972fdce59d50e7e49ff2a7e8de76 + mask = 41103f438e + header = d0709a50c40008f067a5502a4262b5004075103e + + The final protected packet is then: + + d0709a50c40008f067a5502a4262b500 4075103e63b4ebb7972fdce59d50e7e4 + 9ff2a7e8de76b0cd8c10100a1f13d549 dd6fe801588fb14d279bef8d7c53ef62 + 66a9a7a1a5f2fa026c236a5bf8df5aa0 f9d74773aeccfffe910b0f76814b5e33 + f7b7f8ec278d23fd8c7a9e66856b8bbe 72558135bca27c54d63fcc902253461c + fc089d4e6b9b19 + +A.4. Retry + + This shows a Retry packet that might be sent in response to the + Initial packet in Appendix A.2. The integrity check includes the + client-chosen connection ID value of 0x8394c8f03e515708, but that + value is not included in the final Retry packet: + + cf709a50c40008f067a5502a4262b574 6f6b656e1dc71130cd1ed39d6efcee5c + 85806501 + +A.5. ChaCha20-Poly1305 Short Header Packet + + This example shows some of the steps required to protect a packet + with a short header. This example uses AEAD_CHACHA20_POLY1305. + + In this example, TLS produces an application write secret from which + a server uses HKDF-Expand-Label to produce four values: a key, an IV, + a header protection key, and the secret that will be used after keys + are updated (this last value is not used further in this example). + + secret + = 9ac312a7f877468ebe69422748ad00a1 + 5443f18203a07d6060f688f30f21632b + + key = HKDF-Expand-Label(secret, "quicv2 key", "", 32) + = 3bfcddd72bcf02541d7fa0dd1f5f9eee + a817e09a6963a0e6c7df0f9a1bab90f2 + + iv = HKDF-Expand-Label(secret, "quicv2 iv", "", 12) + = a6b5bc6ab7dafce30ffff5dd + + hp = HKDF-Expand-Label(secret, "quicv2 hp", "", 32) + = d659760d2ba434a226fd37b35c69e2da + 8211d10c4f12538787d65645d5d1b8e2 + + ku = HKDF-Expand-Label(secret, "quicv2 ku", "", 32) + = c69374c49e3d2a9466fa689e49d476db + 5d0dfbc87d32ceeaa6343fd0ae4c7d88 + + The following shows the steps involved in protecting a minimal packet + with an empty Destination Connection ID. This packet contains a + single PING frame (that is, a payload of just 0x01) and has a packet + number of 654360564. In this example, using a packet number of + length 3 (that is, 49140 is encoded) avoids having to pad the payload + of the packet; PADDING frames would be needed if the packet number is + encoded on fewer bytes. + + pn = 654360564 (decimal) + nonce = a6b5bc6ab7dafce328ff4a29 + unprotected header = 4200bff4 + payload plaintext = 01 + payload ciphertext = 0ae7b6b932bc27d786f4bc2bb20f2162ba + + The resulting ciphertext is the minimum size possible. One byte is + skipped to produce the sample for header protection. + + sample = e7b6b932bc27d786f4bc2bb20f2162ba + mask = 97580e32bf + header = 5558b1c6 + + The protected packet is the smallest possible packet size of 21 + bytes. + + packet = 5558b1c60ae7b6b932bc27d786f4bc2bb20f2162ba + +Appendix B. Changelog *RFC Editor's Note:* Please remove this section prior to publication of a final version of this document. -A.1. since draft-duke-quic-v2-02 +B.1. since draft-ietf-quic-v2-00 + + * Expanded requirements for compatible version negotiation + + * Added test vectors + + * Greased the packet type codepoints + + * Random version number + + * Clarified requirement to use QUIC-VN + + * Banned use of resumption tokens across versions + +B.2. since draft-duke-quic-v2-02 * Converted to adopted draft * Deleted references to QUIC improvements * Clarified status of QUIC extensions -A.2. since draft-duke-quic-v2-01 +B.3. since draft-duke-quic-v2-01 * Made the final version number TBD. * Added ALPN considerations -A.3. since draft-duke-quic-v2-00 +B.4. since draft-duke-quic-v2-00 * Added provisional versions for interop * Change the v1 Retry Tag secret * Change labels to create full key separation Author's Address Martin Duke - F5, Inc. + Google LLC Email: martin.h.duke@gmail.com