The Use of Maxlength in the RPKI
draft-ietf-sidrops-rpkimaxlen-05
Network Working Group Y. Gilad
Internet-Draft Hebrew University of Jerusalem
Intended status: Best Current Practice S. Goldberg
Expires: May 6, 2021 Boston University
K. Sriram
USA NIST
J. Snijders
NTT
B. Maddison
Workonline Communications
November 2, 2020
The Use of Maxlength in the RPKI
draft-ietf-sidrops-rpkimaxlen-05
Abstract
This document recommends ways to reduce forged-origin hijack attack
surface by prudently limiting the set of IP prefixes that are
included in a Route Origin Authorization (ROA). 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 the use of Distributed Denial of Service (DDoS)
mitigation services. Considerations related to ROAs and origin
validation in the context of destination-based Remote Triggered Black
Hole (RTBH) filtering are also highlighted.
Status of This Memo
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on May 6, 2021.
Gilad, et al. Expires May 6, 2021 [Page 1]
Internet-Draft RPKI maxLength November 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Documentation Prefixes . . . . . . . . . . . . . . . . . 4
2. Suggested Reading . . . . . . . . . . . . . . . . . . . . . . 4
3. Forged-Origin Subprefix Hijack . . . . . . . . . . . . . . . 4
4. Measurements of Today's RPKI . . . . . . . . . . . . . . . . 6
5. Recommendations about Minimal ROAs and Maxlength . . . . . . 7
5.1. Creation of ROAs Facilitating DDoS Mitigation Service . . 7
6. ROAs and Origin Validation for RTBH Filtering Scenario . . . 9
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.1. Normative References . . . . . . . . . . . . . . . . . . 10
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 that
prefix. Each ROA contains a set of IP prefixes and an AS number of
an AS authorized to 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
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