CDNI Working Group F. Fieau, Ed. Internet-Draft E. Stephan Intended status: Standards Track Orange Expires: March 21, 2019 S. Mishra Verizon September 17, 2018 CDNI extensions for HTTPS delegation draft-fieau-cdni-interfaces-https-delegation-05 Abstract The delivery of content over HTTPS involving multiple CDNs raises credential management issues. This document proposes extensions in CDNI Control and Metadata interfaces to setup HTTPS delegation from an Upstream CDN (uCDN) to a Downstream CDN (dCDN). 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 March 21, 2019. Copyright Notice Copyright (c) 2018 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 Simplified BSD License text as described in Section 4.e of Fieau, et al. Expires March 21, 2019 [Page 1] Internet-Draft CDNI extensions for HTTPS delegation September 2018 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. Known delegation methods . . . . . . . . . . . . . . . . . . 3 4. Extending the CDNI metadata model . . . . . . . . . . . . . . 3 4.1. Extension to PathMetadata object . . . . . . . . . . . . 3 4.2. Delegation methods . . . . . . . . . . . . . . . . . . . 5 4.2.1. AcmeStarDelegationMethod object . . . . . . . . . . . 5 4.2.2. SubcertsDelegationMethod object . . . . . . . . . . . 6 5. Metadata Simple Data Type Descriptions . . . . . . . . . . . 7 5.1. Periodicity . . . . . . . . . . . . . . . . . . . . . . . 8 6. IANA considerations . . . . . . . . . . . . . . . . . . . . . 8 6.1. CDNI MI AcmeStarDelegationMethod Payload Type . . . . . . 8 6.2. CDNI MI SubCertsDelegationMethod Payload Type . . . . . . 8 7. Security considerations . . . . . . . . . . . . . . . . . . . 9 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9 8.1. Normative References . . . . . . . . . . . . . . . . . . 9 8.2. Informative References . . . . . . . . . . . . . . . . . 9 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10 1. Introduction Content delivery over HTTPS using one or more CDNs along the path requires credential management. This specifically applies when an entity delegates delivery of encrypted content to another trusted entity. Several delegation methods are currently proposed within different IETF working groups. They specify different methods for provisioning HTTPS delivery credentials. This document extends the CDNI Metadata interface to setup HTTPS delegation between an upstream CDN (uCDN) and downstream CDN (dCDN). Furthermore, it includes a proposal of IANA registry to enable the adding of new methods. Section 2 is about terminology used in this document. Section 3 presents delegation methods specified at the IETF. Section 4 addresses the extension for handling HTTPS delegation in CDNI. Section 5 describes simple data types. Section 6 is about an IANA registry for delegation methods. Section 7 raises the security issues. Fieau, et al. Expires March 21, 2019 [Page 2] Internet-Draft CDNI extensions for HTTPS delegation September 2018 2. Terminology This document uses terminology from CDNI framework documents such as: CDNI framework document [RFC7336], CDNI requirements [RFC7337] and CDNI interface specifications documents: CDNI Metadata interface [RFC8006] and CDNI Control interface / Triggers [RFC8007]. 3. Known delegation methods There are currently two Internet drafts within the TLS and ACME working groups adopted to handle delegation of HTTPS delivery between entities. This I-D proposes standardizing HTTPS delegation between the entities using CDNI interfaces. This document considers the following two I-D that supports HTTPS delegation: - Sub-certificates [I-D.ietf-tls-subcerts] - Short-term certificates in ACME using STAR API [I-D.ietf-acme-star] 4. Extending the CDNI metadata model This section defines a CDNI extension to the current Metadata interface model that allows bootstrapping delegation methods between a uCDN and a delegate dCDN. 4.1. Extension to PathMetadata object This extension reuses PathMetadata object, as defined in [RFC8006], by adding new "Delegation methods" objects as specified in the following sections. This allows to explicitly indicate support for the given method. Therefore, the presence (or lack thereof) of an AcmeStarDelegationMethod, SubcertsDelegationMethod, and/or further delegation methods, imply support (or lack thereof) for the given method. Example: The PathMatch object can reference a path-metadata that points at the delegation information. Delegation metadata are added to PathMetaData object. Fieau, et al. Expires March 21, 2019 [Page 3] Internet-Draft CDNI extensions for HTTPS delegation September 2018 PathMatch: { "path-pattern": { "pattern": "/movies/*", "case-sensitive": true }, "path-metadata": { "type": "MI.PathMetadata", "href": "https://metadata.ucdn.example/video.example.com/movies" } } Below shows the PathMetaData Object related to /movie/* (located at https://metadata.ucdn.example/video.example.com/movies) PathMetadata: { "metadata": [ { "generic-metadata-type": "MI.TimeWindowACL", "generic-metadata-value": { "times": [{ "windows": [ { "start": "1213948800", "end": "1478047392" }]}], "action": "allow", }}, { "generic-metadata-type": "MI.AcmeStarDelegationMethod", "generic-metadata-value": { "starproxy": "10.2.2.2", "acmeserver" : "10.2.3.3", "credentialslocationuri": "www.ucdn.com/credentials", "periodicity": 36000 }}] } The existence of the "MI.AcmeStarDelegationMethod" object in a PathMetaData Object shall enable the use of one of the AcmeStarDelegation Methods, chosen by the delegate. The delegation method will be activated for the set of Path defined in the PathMatch. See next section for more details about delegation methods metadata specification. Fieau, et al. Expires March 21, 2019 [Page 4] Internet-Draft CDNI extensions for HTTPS delegation September 2018 4.2. Delegation methods This section defines the delegation methods objects metadata. Those metadata allows bootstrapping a secured delegatioin by providing the dCDN with the needed parameters to set it up. 4.2.1. AcmeStarDelegationMethod object This section defines the AcmeStarDelegationMethod object which describes metadata related to the use of Acme Star API presented in [I-D.ietf-acme-star] As expressed in [I-D.ietf-acme-star], when an origin has set a delegation to a specific domain (i.e. dCDN), the dCDN should present to the end-user client, a short-term certificate bound to the master certificate. Property: starproxy Description: Used to advertise the STAR Proxy to the dCDN. Endpoint type defined in RFC8006, section 4.3.3 Type: Endpoint Mandatory-to-Specify: Yes Property: acmeserver Description: used to advertise the ACME server to the dCDN. Endpoint type is defined in RFC8006, section 4.3.3 Type: Endpoint Mandatory-to-Specify: Yes Property: credentialslocationuri Description: expresses the location of the credentials to be fetched by the dCDN. Link type is as defined in RFC8006, section 4.3.1 Type: Link Mandatory-to-Specify: Yes Property: periodicity Fieau, et al. Expires March 21, 2019 [Page 5] Internet-Draft CDNI extensions for HTTPS delegation September 2018 Description: expresses the credentials renewal periodicity. See next section on simple meta data type. Type: Periodicity Mandatory-to-Specify: Yes As an example, AcmeStarDelegationMethod object could express the Acme-Star delegation as the following: AcmeStarDelegationMethod: { "generic-metadata-type": "MI.AcmeStarDelegationMethod", "generic-metadata-value": { "starproxy": "10.2.2.2", "acmeserver": "10.2.3.3", "credentialslocationuri": "www.ucdn.com/credentials", "periodicity": 36000 } } 4.2.2. SubcertsDelegationMethod object This section defines the SubcertsDelegationMethod object which describes metadata related to the use of Subcerts as presented in [I-D.ietf-tls-subcerts] As expressed in [I-D.ietf-tls-subcerts], when an origin has set a delegation to a specific domain (i.e. dCDN), the dCDN should present the Origin or uCDN certificate or "delegated_credential" during the TLS handshake [RFC8446] to the end-user client application, instead of its own certificate. Property: credentialsdelegatingentity Description: Endpoint ID (IP) of the delegating Entity (uCDN). Endpoint type defined in RFC8006, section 4.3.3 Type: Endpoint Mandatory-to-Specify: Yes Property: credentialrecipiententity Description: Endpoint ID (IP) of the delegated entity (dCDN). Endpoint type is defined in RFC8006, section 4.3.3 Fieau, et al. Expires March 21, 2019 [Page 6] Internet-Draft CDNI extensions for HTTPS delegation September 2018 Type: Endpoint Mandatory-to-Specify: Yes Property: credentialslocationuri Description: expresses the location of the credentials to be fetched by the dCDN. Link type is as defined in RFC8006, section 4.3.1 Type: Link Mandatory-to-Specify: Yes Property: periodicity Description: expresses the credentials renewal periodicity. See next section on simple meta data type. Type: Periodicity Mandatory-to-Specify: Yes As an example, when a uCDN has delegated HTTPS delivery to dCDN, a SubcertsDelegationMethod object can express the SubCerts delegation as the following: SubcertsDelegationMethod: { "generic-metadata-type": "MI.SubcertsDelegationMethod", "generic-metadata-value": { "credentialsdelegatingentity": "10.2.2.2", "credentialsrecepiententity": "10.2.3.3", "credentialslocationuri": "www.ucdn.com/credentials", "periodicity": 36000 } } 5. Metadata Simple Data Type Descriptions This section describes the simple data types that are used for properties for objects in this document. Fieau, et al. Expires March 21, 2019 [Page 7] Internet-Draft CDNI extensions for HTTPS delegation September 2018 5.1. Periodicity A time value expressed in seconds to indicate a periodicity. Type: Integer 6. IANA considerations This document requests the registration of the following entries under the "CDNI Payload Types" registry hosted by IANA regarding "CDNI delegation": +----------------------------+---------------+ | Payload Type | Specification | +----------------------------+---------------+ | MI.AcmeStarDelegationMethod| RFCthis | | MI.SubCertDelegationMethod | RFCthis | +----------------------------+---------------+ [RFC Editor: Please replace RFCthis with the published RFC number for this document.] 6.1. CDNI MI AcmeStarDelegationMethod Payload Type Purpose: The purpose of this Payload Type is to distinguish AcmeStarDelegationMethod MI objects (and any associated capability advertisement) Interface: MI/FCI Encoding: see Section 4.2.1 6.2. CDNI MI SubCertsDelegationMethod Payload Type Purpose: The purpose of this Payload Type is to distinguish SubcertsDelegationMethod MI objects (and any associated capability advertisement) Interface: MI/FCI Encoding: see Section 4.2.2 Fieau, et al. Expires March 21, 2019 [Page 8] Internet-Draft CDNI extensions for HTTPS delegation September 2018 7. Security considerations Extensions proposed here do not change Security Considerations as outlined in the CDNI Metadata and Footprint and Capabilities RFCs [RFC8006]. 8. References 8.1. Normative References [RFC7937] Le Faucheur, F., Ed., Bertrand, G., Ed., Oprescu, I., Ed., and R. Peterkofsky, "Content Distribution Network Interconnection (CDNI) Logging Interface", RFC 7937, DOI 10.17487/RFC7937, August 2016, . [RFC8006] Niven-Jenkins, B., Murray, R., Caulfield, M., and K. Ma, "Content Delivery Network Interconnection (CDNI) Metadata", RFC 8006, DOI 10.17487/RFC8006, December 2016, . [RFC8007] Murray, R. and B. Niven-Jenkins, "Content Delivery Network Interconnection (CDNI) Control Interface / Triggers", RFC 8007, DOI 10.17487/RFC8007, December 2016, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . 8.2. Informative References [I-D.ietf-acme-star] Sheffer, Y., Lopez, D., Dios, O., Pastor, A., and T. Fossati, "Support for Short-Term, Automatically-Renewed (STAR) Certificates in Automated Certificate Management Environment (ACME)", draft-ietf-acme-star-03 (work in progress), March 2018. [I-D.ietf-tls-subcerts] Barnes, R., Iyengar, S., Sullivan, N., and E. Rescorla, "Delegated Credentials for TLS", draft-ietf-tls- subcerts-02 (work in progress), August 2018. [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, . Fieau, et al. Expires March 21, 2019 [Page 9] Internet-Draft CDNI extensions for HTTPS delegation September 2018 [RFC7337] Leung, K., Ed. and Y. Lee, Ed., "Content Distribution Network Interconnection (CDNI) Requirements", RFC 7337, DOI 10.17487/RFC7337, August 2014, . Authors' Addresses Frederic Fieau (editor) Orange 40-48, avenue de la Republique Chatillon 92320 France Email: frederic.fieau@orange.com Emile Stephan Orange 2, avenue Pierre Marzin Lannion 22300 France Email: emile.stephan@orange.com Sanjay Mishra Verizon 13100 Columbia Pike Silver Spring MD 20904 USA Email: sanjay.mishra@verizon.com Fieau, et al. Expires March 21, 2019 [Page 10]