PASSporT SHAKEN Extension (SHAKEN)
draft-wendt-stir-passport-shaken-00

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.

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   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

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   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"

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   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.

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   [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,
              <http://www.rfc-editor.org/info/rfc4122>.

   [RFC7519]  Jones, M., Bradley, J., and N. Sakimura, "JSON Web Token
              (JWT)", RFC 7519, DOI 10.17487/RFC7519, May 2015,
              <http://www.rfc-editor.org/info/rfc7519>.

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

   [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,
              <http://www.rfc-editor.org/info/rfc3261>.

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

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