Fast Address Validation
draft-an-fast-address-validation-00

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QUIC                                                               Q. An
Internet-Draft                                                   DP. Liu
Intended status: Standards Track                                 YM. Liu
Expires: May 3, 2020                                             H. Wang
                                                            Alibaba Inc.
                                                        October 31, 2019

                        Fast Address Validation
                  draft-an-fast-address-validation-00

Abstract

   This document describes a fast address validation method for QUIC.

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
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   This Internet-Draft will expire on May 3, 2020.

Copyright Notice

   Copyright (c) 2019 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
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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Notational Conventions  . . . . . . . . . . . . . . . . . . .   2
   3.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   2
   4.  Fast Address Validation During Handshake  . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   As described in [I-D.ietf-quic-transport], a token based scheme is
   defined to facilitate address validation of a client.  The token MUST
   be covered by integrity protection against modification or
   falsification by clients.  The server remembers the value it sends to
   clients and validates the token sent back from a client.  In its
   design, Retry packet is used to deliver the token to a client which
   address has not yet been validated.  It voids the first transmission
   of the Initial packet sent by the client, and triggers a second
   Initial packet to be sent with the token.  The exchange of token will
   cause unnecessary longer connection establishment delay for a client.

   In this document, an alternative mechanism is proposed to improve the
   efficiency of address validation during handshake.  For the first
   connection between client and server, eliminate the use of Retry
   packet for token delivery, and rely on handshake encryption layer to
   prove return routability.  In addition, New_Token frame is used by
   server, via i.e. the Initial packet, to provide the client with an
   address validation token that can be used to validate future
   connections.

2.  Notational 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 [RFC2119].

3.  Problem Statement

   Address validation is used by QUIC to avoid being used for a traffic
   amplification attack.  In such an attack, a request is sent to a
   server with spoofed source address information that identifies a
   victim.  If a server generates more or larger packets in response to
   that request, the attacker can use the server to send more data
   toward the victim than it would be able to send on its own.

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   The primary defense against amplification attack is verifying that an
   endpoint is able to receive packets at the transport address that it
   claims.  Address validation is performed both during connection