| RFC 9582 | Route Origin Authorization | May 2024 |
| Snijders, et al. | Standards Track | [Page] |
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.¶
This is an Internet Standards Track document.¶
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.¶
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at https://www.rfc-editor.org/info/rfc9582.¶
Copyright (c) 2024 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 to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License.¶
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 Autonomous System (AS) has been given permission by an IP address block holder to advertise routes to one or more prefixes within that block. A Route Origin Authorization (ROA) provides this function.¶
The ROA makes use of the template for RPKI digitally signed objects [RFC6488], which defines a Cryptographic Message Syntax (CMS) wrapper [RFC5652] 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:¶
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.¶
This section summarizes the significant changes between [RFC6482] and the profile described in this document.¶
It is assumed that the reader is familiar with the terms and concepts described in "Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile" [RFC5280] and "X.509 Extensions for IP Addresses and AS Identifiers" [RFC3779].¶
Additionally, this document makes use of the RPKI signed object profile [RFC6488]; thus, familiarity with that document is assumed. Note that the RPKI signed object profile makes use of certificates adhering to the RPKI resource certificate profile [RFC6487]; thus, familiarity with that profile is also assumed.¶
The content-type for a ROA is defined as id-ct-routeOriginAuthz and has the numerical value 1.2.840.113549.1.9.16.1.24.¶
This OID MUST appear within both the eContentType in the encapContentInfo object and the content-type signed attribute in the signerInfo object (see [RFC6488]).¶
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-2023
{ iso(1) member-body(2) us(840) rsadsi(113549)
pkcs(1) pkcs9(9) smime(16) mod(0)
id-mod-rpkiROA-2023(75) }
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)
ROAIPAddressFamily ::= SEQUENCE {
addressFamily ADDRESS-FAMILY.&afi ({AddressFamilySet}),
addresses ADDRESS-FAMILY.&Addresses
({AddressFamilySet}{@addressFamily}) }
ADDRESS-FAMILY ::= CLASS {
&afi OCTET STRING (SIZE(2)) UNIQUE,
&Addresses
} WITH SYNTAX { AFI &afi ADDRESSES &Addresses }
AddressFamilySet ADDRESS-FAMILY ::=
{ addressFamilyIPv4 | addressFamilyIPv6 }
addressFamilyIPv4 ADDRESS-FAMILY ::=
{ AFI afi-IPv4 ADDRESSES ROAAddressesIPv4 }
addressFamilyIPv6 ADDRESS-FAMILY ::=
{ AFI afi-IPv6 ADDRESSES ROAAddressesIPv6 }
afi-IPv4 OCTET STRING ::= '0001'H
afi-IPv6 OCTET STRING ::= '0002'H
ROAAddressesIPv4 ::= SEQUENCE (SIZE(1..MAX)) OF ROAIPAddress{ub-IPv4}
ROAAddressesIPv6 ::= SEQUENCE (SIZE(1..MAX)) OF ROAIPAddress{ub-IPv6}
ub-IPv4 INTEGER ::= 32
ub-IPv6 INTEGER ::= 128
ROAIPAddress {INTEGER: ub} ::= SEQUENCE {
address BIT STRING (SIZE(0..ub)),
maxLength INTEGER (0..ub) OPTIONAL }
END
¶
The version number of the RouteOriginAttestation entry MUST be 0.¶
The asID element contains the AS number that is authorized to originate routes to the given IP address prefixes.¶
The ipAddrBlocks element 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 IP prefixes.¶
Within the ROAIPAddressFamily structure, the addressFamily element 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. IPv4 prefixes MUST NOT appear as IPv4-mapped IPv6 addresses (Section 2.5.5.2 of [RFC4291]).¶
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 contains IP prefixes as a sequence of type ROAIPAddress.¶
A ROAIPAddress structure is a sequence containing an address element of type BIT STRING and an optional maxLength element of type INTEGER.¶
The address element is of type BIT STRING and represents a single IP address prefix. This field uses the same representation of an IP address prefix as a BIT STRING as the IPAddress type defined in Section 2.2.3.8 of [RFC3779].¶
When present, the maxLength element specifies the maximum length of the IP address prefix that the AS is authorized to advertise. The maxLength element SHOULD NOT be encoded if the maximum length is equal to the prefix length. Certification Authorities SHOULD anticipate that future Relying Parties will become increasingly stringent in considering the presence of superfluous maxLength elements an encoding error.¶
If present, the maxLength element MUST be:¶
For example, if the IP address prefix is 203.0.113.0/24 and 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 element is not present, the AS is only authorized to advertise the exact prefix specified in the ROAIPAddress structure's address element.¶
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, because in such a case, the ROAIPAddress element with the shorter maxLength grants no additional privileges to the indicated AS and thus can be omitted without changing the meaning of the ROA.¶
As the data structure described by the ROA ASN.1 module allows for many different ways to represent the same set of IP address information, a canonical form is defined such that every set of IP address information has a unique representation. In order to produce and verify this canonical form, the process described in this section SHOULD be used to ensure that information elements are unique with respect to one another and sorted in ascending order. Certification Authorities SHOULD anticipate that future Relying Parties will impose a strict requirement for the ipAddrBlocks field to be in this canonical form. This canonicalization procedure builds upon the canonicalization procedure specified in Section 2.2.3.6 of [RFC3779].¶
In order to semantically compare, sort, and deduplicate the contents of the ipAddrBlocks field, each ROAIPAddress element is mapped to an abstract data element composed of four integer values:¶
Thus, the equality or relative order of two ROAIPAddress elements can be tested by comparing their abstract representations.¶
The set of ipAddrBlocks is totally ordered. The order of two ipAddrBlocks is determined by the first non-equal comparison in the following list.¶
Data elements for which all four values compare equal are duplicates of one another.¶
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:¶
If any of the above checks fail, the ROA in its entirety MUST be considered invalid and an error SHOULD be logged.¶
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 or prefixes in the ROA. Thus, the integrity of a ROA MUST be established. This ROA specification makes use of the RPKI signed object format; thus, all security considerations discussed 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 or prefixes is established through the use of the address space and AS number PKI as 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 or prefixes in the ROA are contained within those in the certificate's IP address delegation extension.¶
IANA has updated the id-ct-routeOriginAuthz entry in the "SMI Security for S/MIME CMS Content Type (1.2.840.113549.1.9.16.1)" registry as follows:¶
| Decimal | Description | References |
|---|---|---|
| 24 | id-ct-routeOriginAuthz | RFC 9582 |
IANA has updated the Route Origination Authorization entry in the "RPKI Signed Objects" registry created by [RFC6488] as follows:¶
| Name | OID | Reference |
|---|---|---|
| Route Origination Authorization | 1.2.840.113549.1.9.16.1.24 | RFC 9582 |
IANA has updated the entry for the ROA file extension in the "RPKI Repository Name Schemes" registry created by [RFC6481] as follows:¶
| Filename Extension | RPKI Object | Reference |
|---|---|---|
| .roa | Route Origination Authorization | RFC 9582 |
IANA has allocated the following entry in the "SMI Security for S/MIME Module Identifier (1.2.840.113549.1.9.16.0)" registry:¶
| Decimal | Description | References |
|---|---|---|
| 75 | id-mod-rpkiROA-2023 | RFC 9582 |
IANA has updated the media type application/rpki-roa in the "Media Types" registry as follows:¶
An example of a DER-encoded ROA eContent is provided below, with annotation following the "#" character.¶
$ echo 16i 301802030100003011300F040200023009300703050020010DB8 P \
| dc | openssl asn1parse -inform DER -i -dump
0:d=0 hl=2 l= 24 cons: SEQUENCE # RouteOriginAttestation
2:d=1 hl=2 l= 3 prim: INTEGER :010000 # asID 65536
7:d=1 hl=2 l= 17 cons: SEQUENCE # ipAddrBlocks
9:d=2 hl=2 l= 15 cons: SEQUENCE # ROAIPAddressFamily
11:d=3 hl=2 l= 2 prim: OCTET STRING # addressFamily
0000 - 00 02 # IPv6
15:d=3 hl=2 l= 9 cons: SEQUENCE # addresses
17:d=4 hl=2 l= 7 cons: SEQUENCE # ROAIPAddress
19:d=5 hl=2 l= 5 prim: BIT STRING # 2001:db8::/32
0000 - 00 20 01 0d b8
¶
Below is a complete RPKI ROA signed object, Base64 encoded per [RFC4648].¶
MIIGgAYJKoZIhvcNAQcCoIIGcTCCBm0CAQMxDTALBglghkgBZQMEAgEwKwYLKoZI hvcNAQkQARigHAQaMBgCAwEAADARMA8EAgACMAkwBwMFACABDbigggR8MIIEeDCC A2CgAwIBAgIBAzANBgkqhkiG9w0BAQsFADAvMS0wKwYDVQQDEyQ4NjUyNWNkNS00 NGQ3LTRkZjktODA3OS00YTlkY2RmMjY5NDQwHhcNMjQwNTAxMDAzNDEzWhcNMjUw NTAxMDAzNDEzWjAvMS0wKwYDVQQDEyRlYjg3NmJmMC1lYTlkLTRiMjItYTExZS0y YmNhZDA4MzliMTMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCsPSYD JnGOFRSHUZuVxibx2TQfWWoPIHNKgQAwYn1Kz88HaGgVf63G1mJd/cxBNMj5AfNQ m2zKSAb83UAp97DUXf+lvoKj4F+lxCCjFaBpBeehc7X0XPDpbcbqo1YrzIzxxqou GijEwZ4k+BaM2avEFYMBszqWA+ZdneBSuZ3YbHPKp2royn4pJ9a1I5fYdqFQi0eo VZbAc8pZmwRVOuedYYqQiy9CSRGsbiGlB0fKt2m/zSsuvl4Zit7+NyGL3wAZecjZ XEInsTtQsjQuy5PeJjLDyfWi/ZFi0qPsNlK0M2lMsi5B7QKaagA1RbRVHZyrkWoe 20l5rfk1bIGMv/plAgMBAAGjggGdMIIBmTAOBgNVHQ8BAf8EBAMCB4AwHQYDVR0O BBYEFN4UWxk/syCyWnRDVSmMi/fCUj0iMB8GA1UdIwQYMBaAFNZyCOpHDp1t1mVA IvVTrcE4mrQ0MBgGA1UdIAEB/wQOMAwwCgYIKwYBBQUHDgIwWgYIKwYBBQUHAQEE TjBMMEoGCCsGAQUFBzAChj5yc3luYzovL3Jwa2kuZXhhbXBsZS5uZXQvcmVwby8x bklJNmtjT25XM1daVUFpOVZPdHdUaWF0RFNnLmNlcjBRBgNVHR8ESjBIMEagRKBC hkByc3luYzovL3Jwa2kuZXhhbXBsZS5uZXQvcmVwby9BLzFuSUk2a2NPblczV1pV QWk5Vk90d1RpYXREU2cuY3JsMFwGCCsGAQUFBwELBFAwTjBMBggrBgEFBQcwC4ZA cnN5bmM6Ly9ycGtpLmV4YW1wbGUubmV0L3JlcG8vQS8zaFJiR1QteklMSmFkRU5W S1l5TDk4SlNQU0tnLnJvYTAgBggrBgEFBQcBBwEB/wQRMA8wDQQCAAIwBwMFACAB DbgwDQYJKoZIhvcNAQELBQADggEBAKFoMax1Gdxb9mvSfKE2Jo+DudqCGjWF3mGv rkhag8CQYi2CBJZLrkpCRha8doBW4PbrL36waWG55A/TdLKvWzAf66/v3iL5QcXo Krb0+fp1pu/YVK4xFxwYJhbX4OnL4Gqh9+t4fFXhEDj2QemlgjWZyxvgx2Sra/iK fOt6gxUhie3oIT+FiYjqF//WIUBP/HjTf+E4IRGN8tCr3NDhMZG6c0njq2keW7w4 wnw1+GqSyDhqu0Rsr0m3XUbivkc+h0ZZBBS9SxPM+GfgdzEDV51VcK1SeMa3G3Ca j0cJA99eTM+j52tkNVupftv1Y+4Wt0XGLKmRNKw26XDaphzw3B8xggGqMIIBpgIB A4AU3hRbGT+zILJadENVKYyL98JSPSIwCwYJYIZIAWUDBAIBoGswGgYJKoZIhvcN AQkDMQ0GCyqGSIb3DQEJEAEYMBwGCSqGSIb3DQEJBTEPFw0yNDA1MDEwMDM0MTNa MC8GCSqGSIb3DQEJBDEiBCBlz4HExs5A69pxkJqTCbUvc2iTS7C4eDd3aJD4hYJS wjANBgkqhkiG9w0BAQEFAASCAQBa2wmuDHbcvfnMRIaOJ6m30zpCZtJVBLDELoA0 2kLb18TfFbxQhUi/jZ9g0hNYksV0n4vOJnCQ3qP6IIfm0ZsKzRnyzZf3f2xegw2p Wzi9Z8QYlc//eY3+XA3bQ37h+s0r7OZkQH7+KmIwDOCYaLh/YB37wp/7giC7bpvi c2Fv2illQmctrK7tYDHsNGq+svULTjemUaklqfcRAAJnQTRzTz8So9wKY9SR2VVZ 68DDItTBUx8jPYeNQtvxxoVA6HuW9wyurlYQ9m/cF8CzlizVmsHgxzjO9ifmYJj9 YZWMLtjF7Xw1fQZLYMrD5DCZzUw3nv4GyyHxckm2kLF38mze¶
The object in this appendix has the following properties:¶
Object size: 1668 octets
Object SHA256 message digest:
3a39e0b652e79ddf6efdd178ad5e3b29e0121b1e593b89f1e0ac18f3ba60d5e7
CMS signing time: Wed 01 May 2024 00:34:13 +0000
X.509 end-entity certificate
Subject key id: DE145B193FB320B25A744355298C8BF7C2523D22
Authority key id: D67208EA470E9D6DD6654022F553ADC1389AB434
Issuer: CN=86525cd5-44d7-4df9-8079-4a9dcdf26944
Serial: 3
Not before: Wed 01 May 2024 00:34:13 +0000
Not after: Thu 01 May 2025 00:34:13 +0000
IP address delegation: 2001:db8::/32
ROA eContent
asID: 65536
addresses: 2001:db8::/32
¶
The authors wish to thank Theo Buehler, Ties de Kock, Martin Hoffmann, Charles Gardiner, Russ Housley, Jeffrey Haas, Bob Beck, and Tom Harrison for their help and contributions. Additionally, the authors thank Jim Fenton, Vijay Gurbani, Haoyu Song, Rob Austein, Roque Gagliano, Danny McPherson, Sam Weiler, Jasdip Singh, and Murray S. Kucherawy for their careful reviews and helpful comments.¶