stir C. Wendt Internet-Draft Comcast Intended status: Standards Track M. Barnes Expires: January 4, 2018 MLB@Realtime Communications July 03, 2017 PASSporT SHAKEN Extension (SHAKEN) draft-wendt-stir-passport-shaken-00 Abstract This document extends PASSporT, a token object that conveys cryptographically-signed information about the participants involved in personal communications, to include information defined as part of the SHAKEN [ATIS-1000074] specification for indicating an attestation level and originating ID. 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 http://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 January 4, 2018. Copyright Notice Copyright (c) 2017 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 (http://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 Wendt & Barnes Expires January 4, 2018 [Page 1] Internet-Draft idreg July 2017 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. PASSporT 'attest' Claim . . . . . . . . . . . . . . . . . . . 2 4. PASSporT 'origid' Claim . . . . . . . . . . . . . . . . . . . 3 5. Example . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6. Using 'shaken' in SIP . . . . . . . . . . . . . . . . . . . . 3 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 7.1. JSON Web Token claims . . . . . . . . . . . . . . . . . . 3 7.2. PASSporT Types . . . . . . . . . . . . . . . . . . . . . 4 8. Security Considerations . . . . . . . . . . . . . . . . . . . 4 9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4 10. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 10.1. Normative References . . . . . . . . . . . . . . . . . . 4 10.2. Informative References . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction The SHAKEN specification defines a framework for using STIR protocols including PASSporT and the STIR certificate framework for implementing the cryptographic validation of an authorized originator of telephone calls using SIP. Because the current telephone network contains both VoIP and TDM/SS7 originated traffic, there is many scenarios that need to be accounted for where PASSporT signatures may represent either direct or indirect call origination scenarios. The SHAKEN [ATIS-1000074] specification defines levels of attribution of the origination of the call as well as an origination identifier that can help create a unique association with the origination of calls from various parts of the VoIP or TDM telephone network. This document specifies these indicators as a specified PASSporT extension. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. 3. PASSporT 'attest' Claim This indicator allows for both identifying the service provider that is vouching for the call as well as a clearly indicating what information the service provider is attesting to. The 'attest' claim Wendt & Barnes Expires January 4, 2018 [Page 2] Internet-Draft idreg July 2017 can be one of the following three values, 'A', 'B', or 'C' as defined in [ATIS-1000074]. 4. PASSporT 'origid' Claim The purpose of the unique origination identifier is to assign an opaque identifier corresponding to the service provider-initiated calls themselves, customers, classes of devices, or other groupings that a service provider might want to use for determining things like reputation or trace back identification of customers or gateways. The value of 'origid' claim is a UUID as defined in [RFC4122]. 5. Example Protected Header { "alg":"ES256", "typ":"passport", "ppt":"shaken", "x5u":"https://cert.example.org/passport.crt" } Payload { "attest":"A" "dest":{"uri":"sip:alice@example.com"} "iat":"1443208345", "orig":{"tn":"12155551212"}, "origid":"123e4567-e89b-12d3-a456-426655440000" } 6. Using 'shaken' in SIP The use of the 'shaken' PASSporT type and the claims 'attest' and 'origid' are formally defined in [ATIS-1000074] for usage in SIP [RFC3261] aligned with the use of the identity header defined in [I-D.ietf-stir-rfc4474bis]. The carriage of the 'attest' and 'origid' values are in the full PASSporT token included in the identity header as specified in [ATIS-1000074]. 7. IANA Considerations 7.1. JSON Web Token claims This specification requests that the IANA add two new claims to the JSON Web Token Claims registry as defined in [RFC7519]. Claim Name: "attest" Wendt & Barnes Expires January 4, 2018 [Page 3] Internet-Draft idreg July 2017 Claim Description: Attestation level as defined in SHAKEN framework Change Controller: IESG Specification Document(s): [RFCThis] Claim Name: "origid" Claim Description: Originating Identifier as defined in SHAKEN framework Change Controller: IESG Specification Document(s): [RFCThis] 7.2. PASSporT Types This specification requests that the IANA add a new entry to the PASSporT Types registry for the type "shaken" which is specified in [RFCThis]. 8. Security Considerations TBD 9. Acknowledgements TBD 10. References 10.1. Normative References [ATIS-1000074] ATIS/SIP Forum NNI Task Group, "Signature-based Handling of Asserted information using toKENs (SHAKEN)", January 2017. [I-D.ietf-stir-certificates] Peterson, J. and S. Turner, "Secure Telephone Identity Credentials: Certificates", draft-ietf-stir- certificates-14 (work in progress), May 2017. [I-D.ietf-stir-passport] Wendt, C. and J. Peterson, "Personal Assertion Token (PASSporT)", draft-ietf-stir-passport-11 (work in progress), February 2017. Wendt & Barnes Expires January 4, 2018 [Page 4] Internet-Draft idreg July 2017 [I-D.ietf-stir-rfc4474bis] Peterson, J., Jennings, C., Rescorla, E., and C. Wendt, "Authenticated Identity Management in the Session Initiation Protocol (SIP)", draft-ietf-stir-rfc4474bis-16 (work in progress), February 2017. [RFC4122] Leach, P., Mealling, M., and R. Salz, "A Universally Unique IDentifier (UUID) URN Namespace", RFC 4122, DOI 10.17487/RFC4122, July 2005, . [RFC7519] Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token (JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015, . 10.2. Informative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, DOI 10.17487/RFC3261, June 2002, . Authors' Addresses Chris Wendt Comcast One Comcast Center Philadelphia, PA 19103 USA Email: chris-ietf@chriswendt.net Mary Barnes MLB@Realtime Communications Email: mary.ietf.barnes@gmail.com Wendt & Barnes Expires January 4, 2018 [Page 5]