CDNI MI DeliveryAuthorization Payload Type

Purpose: The purpose of this Payload Type is to distinguish DeliveryAuthorization MI objects (and any associated capability advertisement)

Interface: MI/FCI

Encoding: see Section 4.2.5 7.1.18. CDNI MI Cache Payload Type

Purpose: The purpose of this Payload Type is to distinguish Cache MI objects (and any associated capability advertisement)

Interface: MI/FCI

Encoding: see Section 4.2.6 7.1.19. CDNI MI Auth Payload Type

Purpose: The purpose of this Payload Type is to distinguish Auth MI objects (and any associated capability advertisement)

Interface: MI/FCI

Encoding: see Section 4.2.7

7.1.20. CDNI MI Grouping Payload Type

Purpose: The purpose of this Payload Type is to distinguish Grouping MI objects (and any associated capability advertisement)

Interface: MI/FCI

Encoding: see Section 4.2.8

7.2. "CDNI Metadata Footprint Types" Registry

IANA has created a new "CDNI Metadata Footprint Types" subregistry in the "Content Delivery Network Interconnection (CDNI) Parameters"

registry. The "CDNI Metadata Footprint Types" namespace defines the valid Footprint object type values used by the Footprint object described in Section 4.2.2.2. Additions to the "CDNI Metadata Footprint Types" namespace conform to the Specification Required policy as defined in [RFC5226]. The Designated Expert will verify that new type definitions do not duplicate existing type definitions

and prevent gratuitous additions to the namespace. New registrations are required to provide a clear description of how to interpret new footprint types.

The following table defines the initial values for the "CDNI Metadata Footprint Types" registry:

+---+---+---+

| Footprint Type | Description | Specification | +---+---+---+

| ipv4cidr | IPv4 CIDR address block | RFC 8006 | | ipv6cidr | IPv6 CIDR address block | RFC 8006 | | asn | Autonomous System Number (ASN) | RFC 8006 | | countrycode | ISO 3166-1 alpha-2 code | RFC 8006 | +---+---+---+

7.3. "CDNI Metadata Protocol Types" Registry

IANA has created a new "CDNI Metadata Protocol Types" subregistry in the "Content Delivery Network Interconnection (CDNI) Parameters"

registry. The "CDNI Metadata Protocol Types" namespace defines the valid Protocol object values (Section 4.3.2) used by the

SourceMetadata and ProtocolACL objects. Additions to the Protocol namespace conform to the Specification Required policy as defined in [RFC5226], where the specification defines the Protocol Type and the protocol to which it is associated. The Designated Expert will verify that new protocol definitions do not duplicate existing protocol definitions and prevent gratuitous additions to the namespace.

The following table defines the initial Protocol values corresponding to the HTTP and HTTPS protocols:

+---+---+---+---+

| Protocol | Description | Type | Protocol | | Type | | Specification | Specifications | +---+---+---+---+

| http/1.1 | Hypertext Transfer | RFC 8006 | RFC 7230 | | | Protocol -- HTTP/1.1 | | | | | | | | | https/1.1 | HTTP/1.1 over TLS | RFC 8006 | RFC 7230, | | | | | RFC 2818 | +---+---+---+---+

8. Security Considerations

8.1. Authentication and Integrity

A malicious metadata server, proxy server, or attacker impersonating an authentic uCDN CDNI Metadata interface without being detected could provide false metadata to a dCDN that either:

o Denies service for one or more pieces of content to one or more User Agents;

o Directs dCDNs to contact malicious origin servers instead of the actual origin servers, so that malware or slanderous alternate content may be substituted for legitimate content; or

o Removes delivery restrictions (e.g., LocationACL, TimeWindowACL, ProtocolACL, or Auth metadata), allowing access to content that would otherwise be denied and thus possibly violating license restrictions and incurring unwarranted delivery costs.

Unauthorized access to metadata could also enable a malicious

metadata client to continuously issue metadata requests in order to overload a uCDN’s metadata server or servers.

Unauthorized access to metadata could further result in leakage of private information. A malicious metadata client could request metadata in order to gain access to origin servers, as well as information pertaining to content restrictions.

An implementation of the CDNI Metadata interface MUST use mutual authentication and message authentication codes to prevent

unauthorized access to, and undetected modification of, metadata (see Section 8.3).

8.2. Confidentiality and Privacy

Unauthorized viewing of metadata could result in leakage of private information. Content provider origin and policy information is conveyed through the CDNI Metadata interface. A third party could intercept metadata transactions in order to gain access to origin servers, as well as information pertaining to content restrictions and usage patterns.

Note: The distribution of metadata by a uCDN to dCDNs could introduce privacy concerns for some content providers, e.g., dCDNs accepting content requests for a content provider’s content might be able to obtain additional information and usage patterns relating to the users of a content provider’s services. Content providers with

concerns about divulging information to dCDNs can instruct their uCDN partners not to use CDNI when delivering their content.

An implementation of the CDNI Metadata interface MUST use strong encryption to prevent unauthorized interception or monitoring of metadata (see Section 8.3).

8.3. Securing the CDNI Metadata Interface

An implementation of the CDNI Metadata interface MUST support TLS transport as per [RFC2818] and [RFC7230].

TLS MUST be used by the server side (uCDN) and the client side (dCDN) of the CDNI Metadata interface, including authentication of the

remote end, unless alternate methods are used for ensuring the security of the information in the CDNI Metadata interface requests and responses (such as setting up an IPsec tunnel between the two CDNs or using a physically secured internal network between two CDNs that are owned by the same corporate entity).

The use of TLS for transport of the CDNI Metadata interface messages allows the dCDN and uCDN to authenticate each other.

Once the dCDN and uCDN have mutually authenticated each other, TLS allows:

o The dCDN and uCDN to authorize each other (to ensure that they are transmitting/receiving CDNI Metadata requests and responses from an authorized CDN);

o CDNI Metadata interface requests and responses to be transmitted with confidentiality; and

o The integrity of the CDNI Metadata interface requests and responses to be protected during the exchange.

When TLS is used, the general TLS usage guidance in [RFC7525] MUST be followed.

9. References

9.1. Normative References [ISO3166-1]

The International Organization for Standardization, "Codes for the representation of names of countries and their subdivisions -- Part 1: Country codes",

ISO 3166-1:2013, 2013.

[POSIX] Institute of Electrical and Electronics Engineers, "Information Technology Portable Operating System Interface (POSIX) Part 1: System Application Program Interface (API) [C Language]", IEEE P1003.1, 1990.

[RFC1034] Mockapetris, P., "Domain names - concepts and facilities", STD 13, RFC 1034, DOI 10.17487/RFC1034, November 1987, <http://www.rfc-editor.org/info/rfc1034>.

[RFC1123] Braden, R., Ed., "Requirements for Internet Hosts Application and Support", STD 3, RFC 1123,

DOI 10.17487/RFC1123, October 1989,

<http://www.rfc-editor.org/info/rfc1123>.

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119,

DOI 10.17487/RFC2119, March 1997,

<http://www.rfc-editor.org/info/rfc2119>.

[RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986, DOI 10.17487/RFC3986, January 2005,

<http://www.rfc-editor.org/info/rfc3986>.

[RFC4291] Hinden, R. and S. Deering, "IP Version 6 Addressing Architecture", RFC 4291, DOI 10.17487/RFC4291,

February 2006, <http://www.rfc-editor.org/info/rfc4291>.

[RFC5226] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 5226, DOI 10.17487/RFC5226, May 2008,

<http://www.rfc-editor.org/info/rfc5226>.

[RFC5890] Klensin, J., "Internationalized Domain Names for

Applications (IDNA): Definitions and Document Framework", RFC 5890, DOI 10.17487/RFC5890, August 2010,

<http://www.rfc-editor.org/info/rfc5890>.

[RFC5891] Klensin, J., "Internationalized Domain Names in Applications (IDNA): Protocol", RFC 5891,

DOI 10.17487/RFC5891, August 2010,

<http://www.rfc-editor.org/info/rfc5891>.

[RFC5952] Kawamura, S. and M. Kawashima, "A Recommendation for IPv6 Address Text Representation", RFC 5952,

DOI 10.17487/RFC5952, August 2010,

<http://www.rfc-editor.org/info/rfc5952>.

[RFC6707] Niven-Jenkins, B., Le Faucheur, F., and N. Bitar, "Content Distribution Network Interconnection (CDNI) Problem

Statement", RFC 6707, DOI 10.17487/RFC6707,

September 2012, <http://www.rfc-editor.org/info/rfc6707>.

[RFC7230] Fielding, R., Ed., and J. Reschke, Ed., "Hypertext

Transfer Protocol (HTTP/1.1): Message Syntax and Routing", RFC 7230, DOI 10.17487/RFC7230, June 2014,

<http://www.rfc-editor.org/info/rfc7230>.

[RFC7493] Bray, T., Ed., "The I-JSON Message Format", RFC 7493, DOI 10.17487/RFC7493, March 2015,

<http://www.rfc-editor.org/info/rfc7493>.

[RFC7525] Sheffer, Y., Holz, R., and P. Saint-Andre,

"Recommendations for Secure Use of Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)", BCP 195, RFC 7525, DOI 10.17487/RFC7525, May 2015, <http://www.rfc-editor.org/info/rfc7525>.

9.2. Informative References [CDNI-URI-SIGNING]

van Brandenburg, R., Leung, K., Sorber, P., and M. Miller, "URI Signing for CDN Interconnection (CDNI)", Work in Progress, draft-ietf-cdni-uri-signing-10, October 2016.

[RFC2818] Rescorla, E., "HTTP Over TLS", RFC 2818, DOI 10.17487/RFC2818, May 2000,

<http://www.rfc-editor.org/info/rfc2818>.

[RFC6793] Vohra, Q. and E. Chen, "BGP Support for Four-Octet Autonomous System (AS) Number Space", RFC 6793, DOI 10.17487/RFC6793, December 2012,

<http://www.rfc-editor.org/info/rfc6793>.

[RFC7234] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke, Ed., "Hypertext Transfer Protocol (HTTP/1.1): Caching", RFC 7234, DOI 10.17487/RFC7234, June 2014,

<http://www.rfc-editor.org/info/rfc7234>.

[RFC7336] Peterson, L., Davie, B., and R. van Brandenburg, Ed., "Framework for Content Distribution Network

Interconnection (CDNI)", RFC 7336, DOI 10.17487/RFC7336, August 2014, <http://www.rfc-editor.org/info/rfc7336>.

[RFC7337] Leung, K., Ed., and Y. Lee, Ed., "Content Distribution Network Interconnection (CDNI) Requirements", RFC 7337, DOI 10.17487/RFC7337, August 2014,

<http://www.rfc-editor.org/info/rfc7337>.

[RFC7540] Belshe, M., Peon, R., and M. Thomson, Ed., "Hypertext Transfer Protocol Version 2 (HTTP/2)", RFC 7540, DOI 10.17487/RFC7540, May 2015,

<http://www.rfc-editor.org/info/rfc7540>.

[RFC7736] Ma, K., "Content Delivery Network Interconnection (CDNI) Media Type Registration", RFC 7736, DOI 10.17487/RFC7736, December 2015, <http://www.rfc-editor.org/info/rfc7736>.

[RFC7975] Niven-Jenkins, B., Ed., and R. van Brandenburg, Ed., "Request Routing Redirection Interface for Content Delivery Network (CDN) Interconnection", RFC 7975, DOI 10.17487/RFC7975, October 2016,

<http://www.rfc-editor.org/info/rfc7975>.

[RFC8007] Murray, R. and B. Niven-Jenkins, "Content Delivery Network Interconnection (CDNI) Control Interface / Triggers", RFC 8007, DOI 10.17487/RFC8007, December 2016,

<http://www.rfc-editor.org/info/rfc8007>.

[RFC8008] Seedorf, J., Peterson, J., Previdi, S., van Brandenburg, R., and K. Ma, "Content Delivery Network Interconnection (CDNI) Request Routing: Footprint and Capabilities

Semantics", RFC 8008, DOI 10.17487/RFC8008, December 2016, <http://www.rfc-editor.org/info/rfc8008>.

Acknowledgments

The authors would like to thank David Ferguson, Francois Le Faucheur, Jan Seedorf, and Matt Miller for their valuable comments and input to this document.

Contributors

The authors would also like to thank Grant Watson and Kent Leung for their contributions to this document.

Authors’ Addresses Ben Niven-Jenkins Nokia

3 Ely Road

Milton, Cambridge CB24 6DD United Kingdom

Email: ben.niven-jenkins@nokia.com

Rob Murray Nokia 3 Ely Road

Milton, Cambridge CB24 6DD United Kingdom

Email: rob.murray@nokia.com

Matt Caulfield Cisco Systems

1414 Massachusetts Avenue Boxborough, MA 01719 United States of America Phone: +1-978-936-9307 Email: mcaulfie@cisco.com

Kevin J. Ma Ericsson 43 Nagog Park Acton, MA 01720

United States of America Phone: +1 978-844-5100

Email: kevin.j.ma@ericsson.com