The Use of Maxlength in the RPKI
draft-ietf-sidrops-rpkimaxlen-03

Document Type Active Internet-Draft (sidrops WG)
Last updated 2019-10-24
Replaces draft-yossigi-rpkimaxlen
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Network Working Group                                           Y. Gilad
Internet-Draft                            Hebrew University of Jerusalem
Intended status: Best Current Practice                       S. Goldberg
Expires: April 25, 2020                                Boston University
                                                               K. Sriram
                                                                USA NIST
                                                             J. Snijders
                                                                     NTT
                                                             B. Maddison
                                               Workonline Communications
                                                        October 23, 2019

                    The Use of Maxlength in the RPKI
                    draft-ietf-sidrops-rpkimaxlen-03

Abstract

   This document recommends ways to reduce forged-origin attack surface
   by prudently limiting the address space that is included in Route
   Origin Authorizations (ROAs).  One recommendation is to avoid using
   the maxLength attribute in ROAs except in some specific cases.  The
   recommendations complement and extend those in RFC 7115.  The
   document also discusses creation of ROAs for facilitating Distributed
   Denial of Service (DDoS) mitigation services.  Considerations related
   to ROAs and origin validation for the case of destination-based
   Remote Triggered Black Hole (RTBH) filtering are also highlighted.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on April 25, 2020.

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Internet-Draft               RPKI maxLength                 October 2019

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
   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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements  . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Suggested Reading . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Forged-Origin Subprefix Hijack  . . . . . . . . . . . . . . .   4
   4.  Measurements of Today's RPKI  . . . . . . . . . . . . . . . .   6
   5.  Recommendations about Minimal ROAs and Maxlength  . . . . . .   6
     5.1.  Creation of ROAs Facilitating DDoS Mitigation Service . .   7
   6.  ROAs and Origin Validation for RTBH Filtering Scenario  . . .   9
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The RPKI [RFC6480] uses Route Origin Authorizations (ROAs) to create
   a cryptographically verifiable mapping from an IP prefix to a set of
   autonomous systems (ASes) that are authorized to originate this
   prefix.  Each ROA contains a set of IP prefixes, and an AS number of
   an AS authorized originate all the IP prefixes in the set [RFC6482].
   The ROA is cryptographically signed by the party that holds a
   certificate for the set of IP prefixes.

   The ROA format also supports a maxLength attribute.  According to
   [RFC6482], "When present, the maxLength specifies the maximum length
   of the IP address prefix that the AS is authorized to advertise."
   Thus, rather than requiring the ROA to list each prefix the AS is
   authorized to originate, the maxLength attribute provides a shorthand
   that authorizes an AS to originate a set of IP prefixes.

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