A Profile for Autonomous System Provider Authorization
draft-ietf-sidrops-aspa-profile-08
The information below is for an old version of the document.
| Document | Type |
This is an older version of an Internet-Draft whose latest revision state is "Active".
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|---|---|---|---|
| Authors | Alexander Azimov , Eugene Uskov , Randy Bush , Keyur Patel , Job Snijders , Russ Housley | ||
| Last updated | 2022-07-05 | ||
| Replaces | draft-azimov-sidrops-aspa-profile | ||
| RFC stream | Internet Engineering Task Force (IETF) | ||
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| Additional resources | Mailing list discussion | ||
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draft-ietf-sidrops-aspa-profile-08
Network Working Group A. Azimov
Internet-Draft Yandex
Intended status: Standards Track E. Uskov
Expires: 6 January 2023 JetLend
R. Bush
Internet Initiative Japan
K. Patel
Arrcus
J. Snijders
Fastly
R. Housley
Vigil Security
5 July 2022
A Profile for Autonomous System Provider Authorization
draft-ietf-sidrops-aspa-profile-08
Abstract
This document defines a standard profile for Autonomous System
Provider Authorization in the Resource Public Key Infrastructure. An
Autonomous System Provider Authorization is a digitally signed object
that provides a means of validating that a Customer Autonomous System
holder has authorized members of Provider set to be its upstream
providers or provide route server service at internet exchange point.
For the Providers it means that they are legal to send prefixes
received from the Customer Autonomous System in all directions
including providers and peers.
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/.
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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 6 January 2023.
Copyright Notice
Copyright (c) 2022 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
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provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. The ASPA Content Type . . . . . . . . . . . . . . . . . . . . 3
3. The ASPA eContent . . . . . . . . . . . . . . . . . . . . . . 3
3.1. version . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.2. customerASID . . . . . . . . . . . . . . . . . . . . . . 6
3.3. providers . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3.1. ProviderAS . . . . . . . . . . . . . . . . . . . . . 6
3.3.1.1. providerASID . . . . . . . . . . . . . . . . . . 6
3.3.1.2. afiLimit . . . . . . . . . . . . . . . . . . . . 6
4. ASPA Validation . . . . . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
6. Security Considerations . . . . . . . . . . . . . . . . . . . 8
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 8
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 8
8.1. Normative References . . . . . . . . . . . . . . . . . . 8
8.2. Informative References . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 9
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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 infrastructure, a mechanism is needed
to validate that a AS has permission from a Customer AS (CAS) holder
to send routes in all directions. The digitally signed Autonomous
System Provider Authorization (ASPA) object provides this validation
mechanism.
The ASPA uses the template for RPKI digitally signed objects
[RFC6488], which defines a Cryptographic Message Syntax (CMS)
[RFC5652] wrapper for the ASPA content as well as a generic
validation procedure for RPKI signed objects. As ASPAs need to be
validated with RPKI certificates issued by the current
infrastructure, we assume the mandatory-to-implement algorithms in
[RFC6485], or its successor.
To complete the specification of the ASPA (see Section 4 of
[RFC6488]), this document defines:
1. The object identifier (OID) that identifies the ASPA signed
object. This OID appears in the eContentType field of the
encapContentInfo object as well as the content-type signed
attribute within the signerInfo structure).
2. The ASN.1 syntax for the ASPA content, which is the payload
signed by the CAS. The ASPA content is encoded using the ASN.1
[X680] Distinguished Encoding Rules (DER) [X690].
3. The steps required to validate an ASPA beyond the validation
steps specified in [RFC6488]).
2. The ASPA Content Type
The content-type for an ASPA is defined as id-ct-ASPA, which has the
numerical value of 1.2.840.113549.1.9.16.1.49. This OID MUST appear
both within the eContentType in the encapContentInfo structure as
well as the content-type signed attribute within the signerInfo
structure (see [RFC6488]).
3. The ASPA eContent
The content of an ASPA identifies the Customer AS (CAS) as well as
the Set of Provider ASes (SPAS) that are authorized to further
propagate announcements received from the customer.
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Not all route servers at internet exchange points are transparent,
e.g. in some cases they are present in the ASPATH. In this case
route server AS is acting as provider AS, which propagates routes
between its customers. Thus, a customer MUST add both upstream
providers and route sever AS it is connected to its SPAS.
If customer is connected to multiple transit providers/route servers
they MUST be registered in a single ASPA object. This rule is
important to avoid possible race conditions during updates.
The eContent of an ASPA is an instance of ASProviderAttestation,
formally defined by the following ASN.1 [X680] module:
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RPKI-ASPA-2022
{ iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1)
pkcs-9(9) smime(16) modules(0) id-mod-rpki-aspa-2020(TBD) }
DEFINITIONS IMPLICIT TAGS ::=
BEGIN
IMPORTS
CONTENT-TYPE
FROM CryptographicMessageSyntax-2010 -- RFC 6268
{ iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1)
pkcs-9(9) smime(16) modules(0) id-mod-cms-2009(58) } ;
id-ct-ASPA OBJECT IDENTIFIER ::=
{ iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1)
pkcs-9(9) id-smime(16) id-ct(1) 49 }
ct-ASPA CONTENT-TYPE ::=
{ TYPE ASProviderAttestation IDENTIFIED BY id-ct-ASPA }
ASProviderAttestation ::= SEQUENCE {
version [0] ASPAVersion DEFAULT v0,
customerASID ASID,
providers ProviderASSet }
ASPAVersion ::= INTEGER { v0(0) }
ProviderASSet ::= SEQUENCE (SIZE(1..MAX)) OF ProviderAS
ProviderAS ::= SEQUENCE {
providerASID ASID,
afiLimit AddressFamilyIdentifier OPTIONAL }
ASID ::= INTEGER
AddressFamilyIdentifier ::= OCTET STRING (SIZE (2))
END
Note that this content appears as the eContent within the
encapContentInfo as specified in [RFC6488].
3.1. version
The version number of the ASProviderAttestation MUST be v0.
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3.2. customerASID
The customerASID field contains the AS number of the Autonomous
System (AS) that authorizes a collection of provider ASes (as listed
in the providerASSet) to propagate prefixes in the specified address
family to other ASes.
3.3. providers
The providers field contains the listing of ASes that are authorized
to further propagate announcements in the specified address family
received from the customer.
Each element contained in the providers field is an instance of
ProviderAS.
3.3.1. ProviderAS
3.3.1.1. providerASID
The providerASID field contains the AS number of an AS that has been
authorized by the customer AS to propagate prefixes in the specified
address family to other ASes.
3.3.1.2. afiLimit
The afiLimit field optionally constrains the authorization given to
the provider AS to a single address family.
If present, it contains the two-octet Address Family Identifier (AFI)
for which the relation between the customer and provider is
authorized. AFI values are specified in [IANA-AF].
If omitted, the authorization is valid for both IPv4 and IPv6
announcements.
4. ASPA Validation
Before a relying party can use an ASPA to validate a routing
announcement, the relying party MUST first validate the ASPA object
itself. To validate an ASPA, the relying party MUST perform all the
validation checks specified in [RFC6488] as well as the following
additional ASPA-specific validation step.
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* The autonomous system identifier delegation extension [RFC3779] is
present in the end-entity (EE) certificate (contained within the
ASPA), and the customer AS number in the ASPA is contained within
the set of AS numbers specified by the EE certificate's autonomous
system identifier delegation extension.
5. IANA Considerations
Please add the id-mod-rpki-aspa-2022 to the SMI Security for S/MIME
Module Identifier (1.2.840.113549.1.9.16.0) registry
(https://www.iana.org/assignments/smi-numbers/smi-
numbers.xml#security-smime-0) as follows:
Decimal | Description | Specification
-----------------------------------------------------------
TBD2 | id-mod-rpki-aspa-2022 | [ThisRFC]
Please add the ASPA to the SMI Security for S/MIME CMS Content Type
(1.2.840.113549.1.9.16.1) registry (https://www.iana.org/assignments/
smi-numbers/smi-numbers.xml#security-smime-1) as follows:
Decimal | Description | Specification
-----------------------------------------------------------
49 | id-ct-ASPA | [ThisRFC]
Please add Autonomous System Provider Authorization to the RPKI
Signed Object registry (https://www.iana.org/assignments/rpki/
rpki.xhtml#signed-objects) as follows:
Name | OID | Specification
--------------------------------------------------------------------------------------
Autonomous System Provider Authorization | 1.2.840.113549.1.9.16.1.49 | [ThisRFC]
Please add an item for the Autonomous System Provider Authorization
file extension to the "RPKI Repository Name Scheme" registry created
by [RFC6481] as follows:
Filename
Extension RPKI Object Reference
--------------------------------------------------------------------------------------
.asa Autonomous System Provider Authorization [draft-ietf-sidrops-aspa-profile]
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6. Security Considerations
While it's not restricted, but it's highly recommended maintaining
for selected Customer AS a single ASPA object that covers all
connected providers/route servers. Such policy should prevent race
conditions during ASPA updates that might affect prefix propagation.
The software that provides hosting for ASPA records SHOULD support
enforcement of this rule. In the case of the transition process
between different CA registries, the ASPA records SHOULD be kept
identical in all registries.
7. Acknowledgments
The authors would like to thank Ben Maddison for substantial review
and contributions to the ASN.1 specification.
8. References
8.1. Normative References
[IANA-AF] IANA, "Address Family Numbers",
<https://www.iana.org/assignments/address-family-numbers/
address-family-numbers.xhtml>.
[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>.
[RFC5652] Housley, R., "Cryptographic Message Syntax (CMS)", STD 70,
RFC 5652, DOI 10.17487/RFC5652, September 2009,
<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, February 2012,
<https://www.rfc-editor.org/info/rfc6481>.
[RFC6485] Huston, G., "The Profile for Algorithms and Key Sizes for
Use in the Resource Public Key Infrastructure (RPKI)",
RFC 6485, DOI 10.17487/RFC6485, February 2012,
<https://www.rfc-editor.org/info/rfc6485>.
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[RFC6488] Lepinski, M., Chi, A., and S. Kent, "Signed Object
Template for the Resource Public Key Infrastructure
(RPKI)", RFC 6488, DOI 10.17487/RFC6488, February 2012,
<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,
May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[X680] ITU-T, "Information technology -- Abstract Syntax Notation
One (ASN.1): Specification of basic notation",
ITU-T Recommendation X.680, 2015.
[X690] 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, 2015.
8.2. Informative References
[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>.
Authors' Addresses
Alexander Azimov
Yandex
Email: a.e.azimov@gmail.com
Eugene Uskov
JetLend
Email: eu@jetlend.ru
Randy Bush
Internet Initiative Japan
Email: randy@psg.com
Keyur Patel
Arrcus, Inc.
Email: keyur@arrcus.com
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Job Snijders
Fastly
Amsterdam
Email: job@fastly.com
Russ Housley
Vigil Security, LLC
918 Spring Knoll Drive
Herndon, VA 20170
United States of America
Email: housley@vigilsec.com
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