Internet-Draft A Profile for Route Origin Authorization April 2023
Snijders, et al. Expires 22 October 2023 [Page]
Workgroup:
Network Working Group
Internet-Draft:
draft-ietf-sidrops-rfc6482bis
Obsoletes:
6482 (if approved)
Published:
Intended Status:
Standards Track
Expires:
Authors:
J. Snijders
Fastly
M. Lepinski
New College Florida
D. Kong
Raytheon
S. Kent
Independent

A Profile for Route Origin Authorizations (ROAs)

Abstract

This document defines a standard profile for Route Origin Authorizations (ROAs). A ROA is a digitally signed object that provides a means of verifying that an IP address block holder has authorized an Autonomous System (AS) to originate routes to one or more prefixes within the address block. This document obsoletes RFC 6482.

Requirements Language

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.

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 22 October 2023.

Table of Contents

1. Introduction

The primary purpose of the Resource Public Key Infrastructure (RPKI) is to improve routing security. (See [RFC6480] for more information.) As part of this system, a mechanism is needed to allow entities to verify that an AS has been given permission by an IP address block holder to advertise routes to one or more prefixes within that block. A ROA provides this function.

The ROA makes use of the template for RPKI digitally signed objects [RFC6488], which defines a Crytopgraphic Message Syntax (CMS) [RFC5652] wrapper for the ROA content as well as a generic validation procedure for RPKI signed objects. Therefore, to complete the specification of the ROA (see Section 4 of [RFC6488]), this document defines:

1.1. Changes from RFC6482

This section summarizes the significant changes between [RFC6482] and the profile described in this document.

  • Clarifications on the requirements for IP Addresses and AS Identifiers X.509 certificate extension.
  • Strengthening of ASN.1 formal notation and definitions.
  • Incorporate errata.
  • Add an example ROA payload and ROA as appendix.

3. The ROA ContentType

The content-type for a ROA is defined as routeOriginAuthz and has the numerical value of 1.2.840.113549.1.9.16.1.24.

This OID MUST appear both within the eContentType in the encapContentInfo object as well as the ContentType signed attribute in the signerInfo object (see [RFC6488]).

4. The ROA eContent

The content of a ROA identifies a single AS that has been authorized by the address space holder to originate routes and a list of one or more IP address prefixes that will be advertised. If the address space holder needs to authorize multiple ASes to advertise the same set of address prefixes, the holder issues multiple ROAs, one per AS number. A ROA is formally defined as:

RPKI-ROA-2022 { iso(1) member-body(2) us(840) rsadsi(113549)
  pkcs(1) pkcs9(9) smime(16) mod(0) id-mod-rpkiROA-2022(TBD) }

DEFINITIONS EXPLICIT TAGS ::=
BEGIN

IMPORTS
  CONTENT-TYPE
  FROM CryptographicMessageSyntax-2010 -- in [RFC6268]
    { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1)
      pkcs-9(9) smime(16) modules(0) id-mod-cms-2009(58) } ;

ct-routeOriginAttestation CONTENT-TYPE ::=
  { TYPE RouteOriginAttestation
    IDENTIFIED BY id-ct-routeOriginAuthz }

id-ct-routeOriginAuthz OBJECT IDENTIFIER ::=
  { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1)
    pkcs-9(9) id-smime(16) id-ct(1) routeOriginAuthz(24) }

RouteOriginAttestation ::= SEQUENCE {
  version [0]           INTEGER DEFAULT 0,
  asID                  ASID,
  ipAddrBlocks          SEQUENCE (SIZE(1..2)) OF ROAIPAddressFamily }

ASID ::= INTEGER (0..4294967295)

-- Note: addressFamily can only be '0001'H (IPv4) or '0002'H (IPv6). --
ROAIPAddressFamily ::= SEQUENCE {
  addressFamily         OCTET STRING (SIZE(2)),
  addresses             SEQUENCE (SIZE(1..MAX)) OF ROAIPAddress }

-- Note: maxLength must be equal or larger than size of IPAddress, --
-- and equal or smaller to what the AFI context permits.           --
ROAIPAddress ::= SEQUENCE {
  address               IPAddress,
  maxLength             INTEGER (0..128) OPTIONAL }

-- Note: if the ROAIPAddressFamily's addressFamily is IPv4, the  --
-- IPAddress' size cannot exceed 32; conversely if addressFamily --
-- is IPv6, size can't exceed 128.                               --
IPAddress ::= BIT STRING (SIZE(0..128))

END

4.1. version

The version number of the RouteOriginAttestation MUST be 0.

4.2. asID

The asID field contains the AS number that is authorized to originate routes to the given IP address prefixes.

4.3. Element ipAddrBlocks

The ipAddrBlocks field encodes the set of IP address prefixes to which the AS is authorized to originate routes. Note that the syntax here is more restrictive than that used in the IP Address Delegation extension defined in [RFC3779]. That extension can represent arbitrary address ranges, whereas ROAs need to represent only prefixes.

4.3.1. Type ROAIPAddressFamily

Within the ROAIPAddressFamily structure, the addressFamily field contains the Address Family Identifier (AFI) of an IP address family. This specification only supports IPv4 and IPv6, therefore addressFamily MUST be either 0001 or 0002.

There MUST be only one instance of ROAIPAddressFamily per unique AFI in the ROA. Thus, the ROAIPAddressFamily structure MUST NOT appear more than twice.

The addresses field represents prefixes as a sequence of type ROAIPAddress.

4.3.2. Type ROAIPAddress

A ROAIPAddress structure is a sequence containing an address field of type IPAddress and an optional maxLength field of type INTEGER.

4.3.2.1. Element address

The address field represents a single IP address prefix. See section 2.2.3.8 of [RFC3779] for more details on type IPAddress.

4.3.2.2. Element maxLength

When present, the maxLength specifies the maximum length of the IP address prefix that the AS is authorized to advertise.

If present, the maxLength MUST be:

  • an integer greater than or equal to the length of the accompanying prefix, and
  • less than or equal to the maximum length (in bits) of an IP address in the applicable address family: 32 in case of IPv4 and 128 in case of IPv6.

For example, if the IP address prefix is 203.0.113.0/24 and the maxLength is 26, the AS is authorized to advertise any more-specific prefix with a maximum length of 26. In this example, the AS would be authorized to advertise 203.0.113.0/24, 203.0.113.128/25, or 203.0.113.192/26; but not 203.0.113.0/27. See [RFC9319] for more information on the use of maxLength.

When the maxLength is not present, the AS is only authorized to advertise the exact prefix specified in the ROAIPAddress' address field.

4.3.2.3. Note on overlapping or superfluous information encoding

Note that a valid ROA may contain an IP address prefix (within a ROAIPAddress element) that is encompassed by another IP address prefix (within a separate ROAIPAddress element). For example, a ROA may contain the prefix 203.0.113.0/24 with maxLength 26, as well as the prefix 203.0.113.0/28 with maxLength 28. This ROA would authorize the indicated AS to advertise any prefix beginning with 203.0.113 with a minimum length of 24 and a maximum length of 26, as well as the specific prefix 203.0.113.0/28.

Additionally, a ROA MAY contain two ROAIPAddress elements, where the IP address prefix is identical in both cases. However, this is NOT RECOMMENDED as, in such a case, the ROAIPAddress with the shorter maxLength grants no additional privileges to the indicated AS and thus can be omitted without changing the meaning of the ROA.

5. ROA Validation

Before a relying party can use a ROA to validate a routing announcement, the relying party MUST first validate the ROA. To validate a ROA, the relying party MUST perform all the validation checks specified in [RFC6488] as well as the following additional ROA-specific validation steps.

6. Security Considerations

There is no assumption of confidentiality for the data in a ROA; it is anticipated that ROAs will be stored in repositories that are accessible to all ISPs, and perhaps to all Internet users. There is no explicit authentication associated with a ROA, since the PKI used for ROA validation provides authorization but not authentication. Although the ROA is a signed, application-layer object, there is no intent to convey non-repudiation via a ROA.

The purpose of a ROA is to convey authorization for an AS to originate a route to the prefix(es) in the ROA. Thus, the integrity of a ROA MUST be established. The ROA specification makes use of the RPKI signed object format; thus, all security considerations in [RFC6488] also apply to ROAs. Additionally, the signed object profile uses the CMS signed message format for integrity; thus, ROAs inherit all security considerations associated with that data structure.

The right of the ROA signer to authorize the target AS to originate routes to the prefix(es) is established through use of the address space and AS number PKI described in [RFC6480]. Specifically, one MUST verify the signature on the ROA using an X.509 certificate issued under this PKI, and check that the prefix(es) in the ROA are contained within those in the certificate's IP Address Delegation Extension.

7. IANA Considerations

7.1. SMI Security for S/MIME CMS Content Type (1.2.840.113549.1.9.16.1)

The IANA has allocated for this document in the "SMI Security for S/MIME CMS Content Type (1.2.840.113549.1.9.16.1)" registry:


Decimal   Description             References
---------------------------------------------------------------
  24      id-ct-routeOriginAuthz  [RFC6482][RFC-to-be]

Upon publication of this document, IANA is requested to reference the RFC publication instead of this draft.

7.2. RPKI Signed Objects sub-registry

The IANA has registered the OID for the RPKI Signed Checklist in the "RPKI Signed Objects" registry created by [RFC6488] as follows:


Name              OID                         Specification
-------------------------------------------------------------
ROA               1.2.840.113549.1.9.16.1.24  [RFC6482][RFC-TBD]

7.3. File Extension

The IANA has added an item for the ROA file extension to the "RPKI Repository Name Schemes" registry created by [RFC6481] as follows:


Filename Extension  RPKI Object                     Reference
------------------------------------------------------------------------
       .roa         Route Origination Authorization [RFC6481][RFC-to-be]

Upon publication of this document, IANA is requested to make this addition permanent and to reference the RFC publication instead of this draft.

7.4. SMI Security for S/MIME Module Identifier (1.2.840.113549.1.9.16.0)

The IANA is requested to allocate for this document in the "SMI Security for S/MIME Module Identifier (1.2.840.113549.1.9.16.0)" registry:


Decimal  Description                      References
-----------------------------------------------------------------------
    TBD  id-mod-rpkiROA-2022              [RFC-to-be]

7.5. Media Type

The IANA is requested to update the media type application/rpki-roa in the "Media Type" registry as follows:


   Type name: application
   Subtype name: rpki-roa
   Required parameters: N/A
   Optional parameters: N/A
   Encoding considerations: binary
   Security considerations: Carries an RPKI ROA [RFC-to-be].
       This media type contains no active content. See
       Section 6 of [RFC-to-be] for further information.
   Interoperability considerations: None
   Published specification: [RFC-to-be]
   Applications that use this media type: RPKI operators
   Additional information:
     Content: This media type is a signed object, as defined
         in [RFC6488], which contains a payload of a list of
         prefixes and an AS identifer as defined in [RFC-to-be].
     Magic number(s): None
     File extension(s): .roa
     Macintosh file type code(s):
   Person & email address to contact for further information:
     Job Snijders <job@fastly.com>
   Intended usage: COMMON
   Restrictions on usage: None
   Change controller: IETF

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, , <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, , <https://www.rfc-editor.org/info/rfc3779>.
[RFC5652]
Housley, R., "Cryptographic Message Syntax (CMS)", STD 70, RFC 5652, DOI 10.17487/RFC5652, , <https://www.rfc-editor.org/info/rfc5652>.
[RFC6481]
Huston, G., Loomans, R., and G. Michaelson, "A Profile for Resource Certificate Repository Structure", RFC 6481, DOI 10.17487/RFC6481, , <https://www.rfc-editor.org/info/rfc6481>.
[RFC6482]
Lepinski, M., Kent, S., and D. Kong, "A Profile for Route Origin Authorizations (ROAs)", RFC 6482, DOI 10.17487/RFC6482, , <https://www.rfc-editor.org/info/rfc6482>.
[RFC6487]
Huston, G., Michaelson, G., and R. Loomans, "A Profile for X.509 PKIX Resource Certificates", RFC 6487, DOI 10.17487/RFC6487, , <https://www.rfc-editor.org/info/rfc6487>.
[RFC6488]
Lepinski, M., Chi, A., and S. Kent, "Signed Object Template for the Resource Public Key Infrastructure (RPKI)", RFC 6488, DOI 10.17487/RFC6488, , <https://www.rfc-editor.org/info/rfc6488>.
[RFC8174]
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, , <https://www.rfc-editor.org/info/rfc8174>.
[X.690]
ITU-T, "Information Technology -- ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)", ITU-T Recommendation X.690, .

8.2. Informative References

[RFC4648]
Josefsson, S., "The Base16, Base32, and Base64 Data Encodings", RFC 4648, DOI 10.17487/RFC4648, , <https://www.rfc-editor.org/info/rfc4648>.
[RFC5280]
Cooper, D., Santesson, S., Farrell, S., Boeyen, S., Housley, R., and W. Polk, "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile", RFC 5280, DOI 10.17487/RFC5280, , <https://www.rfc-editor.org/info/rfc5280>.
[RFC6480]
Lepinski, M. and S. Kent, "An Infrastructure to Support Secure Internet Routing", RFC 6480, DOI 10.17487/RFC6480, , <https://www.rfc-editor.org/info/rfc6480>.
[RFC9319]
Gilad, Y., Goldberg, S., Sriram, K., Snijders, J., and B. Maddison, "The Use of maxLength in the Resource Public Key Infrastructure (RPKI)", BCP 185, RFC 9319, DOI 10.17487/RFC9319, , <https://www.rfc-editor.org/info/rfc9319>.

Appendix A. Acknowledgements

The authors wish to thank Charles Gardiner and Russ Housley for their help and contributions. Additionally, the authors thank Rob Austein, Roque Gagliano, Danny McPherson, and Sam Weiler for their careful reviews and helpful comments.

Appendix B. Example ROA eContent Payload

Below an example of a DER encoded ROA eContent is provided with annotation following the '#' character.


$ echo 302402023CCA301E301C04020002301630090307002001067C208C30090307002A0EB2400000 \
  | xxd -r -ps \
  | openssl asn1parse -i -dump -inform DER
    0:d=0  hl=2 l=  36 cons: SEQUENCE                   # RouteOriginAttestation
    2:d=1  hl=2 l=   2 prim:  INTEGER           :3CCA   # asID 15562
    6:d=1  hl=2 l=  30 cons:  SEQUENCE                  # ipAddrBlocks
    8:d=2  hl=2 l=  28 cons:   SEQUENCE                 #  ROAIPAddressFamily
   10:d=3  hl=2 l=   2 prim:    OCTET STRING            #   addressFamily
      0000 - 00 02                              ..      #    IPv6
   14:d=3  hl=2 l=  22 cons:    SEQUENCE                #   addresses
   16:d=4  hl=2 l=   9 cons:     SEQUENCE               #    ROAIPAddress
   18:d=5  hl=2 l=   7 prim:      BIT STRING            #     address
      0000 - 00 20 01 06 7c 20 8c               . ..| . #      2001:67c:208c::/48
   27:d=4  hl=2 l=   9 cons:     SEQUENCE               #    ROAIPAddress
   29:d=5  hl=2 l=   7 prim:      BIT STRING            #     address
      0000 - 00 2a 0e b2 40                     .*..@   #      2a0e:b240::/48
      0007 - <SPACES/NULS>

Below is a complete Base64 [RFC4648] encoded RPKI ROA Signed Object.

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Authors' Addresses

Job Snijders
Fastly
Amsterdam
Netherlands
Matthew Lepinski
New College Florida
Derrick Kong
Raytheon
Stephen Kent
Independent