SIDR Operations

Internet Engineering Task Force (IETF)                            Z. Yan
Internet-Draft
Request for Comments: 9455                                         CNNIC
Intended status:
BCP: 238                                                         R. Bush
Category: Best Current Practice                           R. Bush
Expires: 28 October 2023          IIJ Research Lab & Arrcus, Inc.
                                                               G.G.
ISSN: 2070-1721                                                  G. Geng
                                                        Jinan University
                                                              T. de Kock
                                                                RIPE NCC
                                                                  J. Yao
                                                                   CNNIC
                                                              April
                                                             August 2023

            Avoidance of ROA

   Avoiding Route Origin Authorizations (ROAs) Containing Multiple IP
                                Prefixes
                draft-ietf-sidrops-roa-considerations-08

Abstract

   When using the Resource Public Key Infrastructure (RPKI), address
   space holders need to issue Route Origin Authorization (ROA)
   object(s) to authorize one or more Autonomous Systems (ASes) to
   originate BGP routes to IP address prefix(es).  This memo discusses
   operational problems which that may arise from ROAs containing multiple IP
   prefixes and recommends that each ROA contains contain a single IP prefix.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working memo documents an Internet Best Current Practice.

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   This Internet-Draft will expire on 3 October 2023.
   https://www.rfc-editor.org/info/rfc9455.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Recommendations . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Acknowledgements
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   In the RPKI, a ROA ROA, which is a digitally signed object which object, identifies
   that a single AS has been authorized by the address space holder to
   originate BGP routes to one or more IP prefixes within the related
   address space [RFC6482].

   Each ROA contains an "asID" asID field and an "ipAddrBlocks" ipAddrBlocks field.  The
   "asID" asID
   field contains a single AS number which that is authorized to originate
   routes to the given IP address prefix(es).  The
   "ipAddrBlocks" ipAddrBlocks field
   contains one or more IP address prefixes to which the AS is
   authorized to originate the routes.

   If the address space holder needs to authorize more than one AS to
   advertise the same set of IP prefixes, multiple ROAs must be issued
   (one for each AS number [RFC6480]).  Prior to this document, there
   was no guidance recommending the issuance of a separate ROA for each
   IP prefix or a single ROA containing multiple IP prefixes.

2.  Terminology

   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.  Problem Statement

   An address space holder can issue a separate ROA for each of its
   routing announcements.  Alternatively, for a given asID, it can issue
   a single ROA for multiple routing announcements, or even for all of
   its routing announcements.  Since a given ROA is either valid or
   invalid, the routing announcements for which that ROA was issued will
   "share fate" when it comes to RPKI validation.  Currently, no
   guidance is offered in
   existing RFCs to recommend provide recommendations about what kinds of ROA
   are issued: ROAs to
   issue: one per prefix, prefix or one ROA for multiple routing announcements.  The
   problem of fate-sharing was not discussed or addressed.

   In the RPKI trust chain, the Certification Authority (CA) certificate
   issued by a parent CA to a delegate delegatee of some resources may be revoked
   by the parent at any time resulting time, which would result in changes to resources
   specified in the [RFC3779] certificate extension. extensions defined in [RFC3779].  Any
   ROA object that includes resources which that are a) no longer entirely
   contained in the new CA
   certificate, certificate or b) contained in a new CA
   certificate that has not yet been discovered by Relying Party (RP) software,
   software will be rejected as invalid.  Since ROA invalidity affects
   all routes specified in that ROA, unchanged resources with associated
   routes via that asID cannot be separated from those affected by the
   change in the CA certificate validity.  They will fall under this invalid
   ROA even though there was no intention intent to change their validity.  Had
   these resources been in a separate ROA, there would have been be no change to
   the issuing CA
   certificate, certificate and therefore no subsequent invalidity.

   CAs have to carefully coordinate ROA updates with updates to a
   resource
   certificate updates. certificate.  This process may be automated if a single
   entity manages both the parent CA and the CA issuing the ROAs
   (Scenario D in [RFC8211] [RFC8211], Section 3). 3.4).  However, in other deployment
   scenarios, this coordination becomes more complex.

   As there is a single expiration time for the entire ROA, expiration
   will affect all prefixes in the ROA.  Thus, any changes to the ROA for
   any of the prefixes must be synchronized with any changes to other
   prefixes, especially time-limitations on when authorization for a
   prefix. prefix is time bounded.
   Had these prefixes been in separately issued ROAs, the validity
   interval would be unique to each ROA, and invalidity would only be
   affected by re-issuance reissuance of the specific issuing parent CA certificate
   which issued them. certificate.

   A prefix could be allowed to be originated originate from an AS only for a specific
   period of time, for example example, if the IP prefix was leased out
   temporarily.  This  If a ROA with multiple IP prefixes was used, this would
   be more difficult to manage, and potentially be more error-prone if a ROA with multiple IP prefixes was used.
   Similarly error-prone.
   Similarly, more complex routing may demand require changes in asID or routes
   for a subset of prefixes.  Re-issuance  Reissuance of the a ROA may cause change might result in
   changes to the validity for all of previously received BGP routes in covered by
   the affected ROA.  If ROA's prefixes.  There will be no change to the time limited validity of
   unaffected routes if a) the time-limited resources are in separate
   ROAs, or b) for more complex routing if routing, each change in asID or a change
   in routes for a given prefix is reflected in a change to a discrete ROA, then no change to validity of unaffected routes
   will be caused.
   ROA.

   The use of ROA with a single IP prefix can minimize these side- side
   effects.  It avoids fate-sharing irrespective of the causes, cause, where the
   parent CA issuing each ROA remains valid and where each ROA itself
   remains valid.

4.  Recommendations

   Unless the CA has good reasons to the contrary, an issued ROA SHOULD
   contain a single IP prefix.

5.  Security Considerations

   Issuing separate ROAs for independent IP prefixes may increase the
   file fetch
   file-fetch burden on the RP during validation.

6.  IANA Considerations

   This document does not request any has no IANA action. actions.

7.  Acknowledgements

   The authors wish to thank the following people for their review and
   contributions to this document: George Michaelson, Tim Bruijnzeels,
   Job Snijders, Di Ma, Geoff Huston, Tom Harrison, Rob Austein, Stephen
   Kent, Christopher Morrow, Russ Housley, Ching-Heng Ku, Keyur Patel,
   Cuiling Zhang and Kejun Dong.  Thanks are also due to Warren Kumari
   for the Security Area Directorate review.

   This work was supported by the Beijing Nova Program of Science and
   Technology under grant Z191100001119113.

   This document was produced using the xml2rfc tool [RFC2629].

8.  References

8.1.  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,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC3779]  Lynn, C., Kent, S., and K. Seo, "X.509 Extensions for IP
              Addresses and AS Identifiers", RFC 3779,
              DOI 10.17487/RFC3779, June 2004,
              <https://www.rfc-editor.org/info/rfc3779>.

   [RFC6480]  Lepinski, M. and S. Kent, "An Infrastructure to Support
              Secure Internet Routing", RFC 6480, DOI 10.17487/RFC6480,
              February 2012, <https://www.rfc-editor.org/info/rfc6480>.

   [RFC6482]  Lepinski, M., Kent, S., and D. Kong, "A Profile for Route
              Origin Authorizations (ROAs)", RFC 6482,
              DOI 10.17487/RFC6482, February 2012,
              <https://www.rfc-editor.org/info/rfc6482>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8211]  Kent, S. and D. Ma, "Adverse Actions by a Certification
              Authority (CA) or Repository Manager in the Resource
              Public Key Infrastructure (RPKI)", RFC 8211,
              DOI 10.17487/RFC8211, September 2017,
              <https://www.rfc-editor.org/info/rfc8211>.

8.2.  Informative References

   [RFC2629]  Rose, M., "Writing I-Ds

Acknowledgements

   The authors wish to thank the following people for their reviews and RFCs using XML", RFC 2629,
              DOI 10.17487/RFC2629, June 1999,
              <https://www.rfc-editor.org/info/rfc2629>.
   contributions to this document: George Michaelson, Tim Bruijnzeels,
   Job Snijders, Di Ma, Geoff Huston, Tom Harrison, Rob Austein, Stephen
   Kent, Christopher Morrow, Russ Housley, Ching-Heng Ku, Keyur Patel,
   Cuiling Zhang, and Kejun Dong.  Thanks are also due to Sean Turner
   for the Security Area Directorate review.

   This work was supported by the Beijing Nova Program of Science and
   Technology under grant Z191100001119113.

Authors' Addresses

   Zhiwei Yan
   CNNIC
   No.4 South 4th Street, Zhongguancun
   Beijing,
   Beijing
   100190
   P.R.
   China
   Email: yanzhiwei@cnnic.cn

   Randy Bush
   IIJ Research Lab & Arrcus, Inc.
   5147 Crystal Springs
   Bainbridge Island, Washington 98110
   United States of America
   Email: randy@psg.com

   Guanggang Geng
   Jinan University
   No.601, West Huangpu Avenue
   Guangzhou
   510632
   P.R.
   China
   Email: gggeng@jnu.edu.cn

   Ties de Kock
   RIPE NCC
   Stationsplein 11
   Amsterdam
   Netherlands
   Email: tdekock@ripe.net

   Jiankang Yao
   CNNIC
   No.4 South 4th Street, Zhongguancun
   Beijing,
   Beijing
   100190
   P.R.
   China
   Email: yaojk@cnnic.cn