[Docs] [txt|pdf|xml|html] [Tracker] [WG] [Email] [Diff1] [Diff2] [Nits]

Versions: (draft-wendt-stir-passport-shaken) 00 01 02 03 04 05 06 07 08 RFC 8588

stir                                                            C. Wendt
Internet-Draft                                                   Comcast
Intended status: Standards Track                               M. Barnes
Expires: July 21, 2018                       MLB@Realtime Communications
                                                        January 17, 2018


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

Abstract

   This document extends PASSporT, which is a token object that conveys
   cryptographically-signed information about the participants involved
   in communications, to include information defined as part of the
   SHAKEN specification from ATIS (Alliance for Telecommunications
   Industry Solutions) and the SIP Forum IP-NNI Joint Task Force.  These
   extensions provide a level of confidence in the correctness of the
   originating identity for a telephone network that has communications
   coming from both STIR participating originating communications as
   well as communications that does not include STIR information.

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 July 21, 2018.

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



Wendt & Barnes            Expires July 21, 2018                 [Page 1]


Internet-Draft                   shaken                     January 2018


   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
   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.  Overview of 'shaken' PASSporT extension . . . . . . . . . . .   3
   4.  PASSporT 'attest' Claim . . . . . . . . . . . . . . . . . . .   3
   5.  PASSporT 'origid' Claim . . . . . . . . . . . . . . . . . . .   4
   6.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   7.  Using 'shaken' in SIP . . . . . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  JSON Web Token claims . . . . . . . . . . . . . . . . . .   5
     8.2.  PASSporT Types  . . . . . . . . . . . . . . . . . . . . .   6
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     11.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   The SHAKEN [ATIS-1000074] specification defines a framework for using
   STIR protocols including PASSporT [I-D.ietf-stir-passport],
   RFC4474bis [I-D.ietf-stir-rfc4474bis] and the STIR certificate
   framework [I-D.ietf-stir-certificates] 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 are 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 attestation 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].




Wendt & Barnes            Expires July 21, 2018                 [Page 2]


Internet-Draft                   shaken                     January 2018


3.  Overview of 'shaken' PASSporT extension

   The SHAKEN framework is designed to use PASSporT
   [I-D.ietf-stir-passport] as a method of asserting the telephone
   number calling identity.  In addition to the PASSporT base claims,
   there are two additional claims that have been defined for the needs
   of a service provider to signal information beyond just the telephone
   identity.  First, in order to help bridge the transition of the state
   of the current telephone network which has calls with no
   authentication and non-SIP [RFC3261] signaling not compatible with
   the use of PASSporT and Secure Telephone Identity (STI) in general,
   there is an attestation claim.  This provides three levels of
   attestation, including a full attestation when the service provider
   can fully attest to the calling identity, a partial attestation, when
   the service provider originated a telephone call but can not fully
   attest to the calling identity, and a gateway attestation which is
   the lowest level of attestation and represents the service provider
   receiving a call from a non PASSporT or STI supporting telephone
   gateway.

   The second claim is a unique origination identifier that should be
   used by the service provider to identify different sources of
   telephone calls to support a traceback mechanism that can be used for
   enforcement and identification of a source of illegitimate calls.

   The next two sections define these new claims.

4.  PASSporT 'attest' Claim

   This indicator allows for both identifying the service provider that
   is vouching for the call as well as clearly indicating what
   information the service provider is attesting to.  The 'attest' claim
   can be one of the following three values, 'A', 'B', or 'C' as defined
   in [ATIS-1000074].

   'A' represents 'Full Attestation' where the signing provider MUST
   satisfy all of the following conditions:

   o  Is responsible for the origination of the call onto the IP based
      service provider voice network.

   o  Has a direct authenticated relationship with the customer and can
      identify the customer.

   o  Has established a verified association with the telephone number
      used for the call.





Wendt & Barnes            Expires July 21, 2018                 [Page 3]


Internet-Draft                   shaken                     January 2018


   'B' represents 'Partial Attestation' where the signing provider MUST
   satisfy all of the following conditions:

   o  Is responsible for the origination of the call onto its IP-based
      voice network.

   o  Has a direct authenticated relationship with the customer and can
      identify the customer.

   o  Has NOT established a verified association with the telephone
      number being used for the call.

   'C' represents 'Gateway Attestation' where the signing provider MUST
   satisfy all of the following conditions:

   o  Is the entry point of the call into its VoIP network.

   o  Has no relationship with the initiator of the call (e.g.,
      international gateways)

5.  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].
   SHAKEN isn't prescriptive in the exact usage of origid other than the
   UUID format as a globally unique identifier representing the
   originator of the call to whatever granularity the PASSporT signer
   determines is sufficient for the ability to trace the original
   origination point of the call.  There will likely be best practices
   documents that more precisely guide it's usage in real deployments.

6.  Example















Wendt & Barnes            Expires July 21, 2018                 [Page 4]


Internet-Draft                   shaken                     January 2018


   Protected Header
   {
      "alg":"ES256",
      "typ":"passport",
      "ppt":"shaken",
      "x5u":"https://cert.example.org/passport.cer"
   }
   Payload
   {
      "attest":"A"
      "dest":{"uri":["sip:alice@example.com"]}
      "iat":"1443208345",
      "orig":{"tn":"12155551212"},
      "origid":"123e4567-e89b-12d3-a456-426655440000"
   }

7.  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].

8.  IANA Considerations

8.1.  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"

   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]



Wendt & Barnes            Expires July 21, 2018                 [Page 5]


Internet-Draft                   shaken                     January 2018


8.2.  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].

9.  Security Considerations

   TBD

10.  Acknowledgements

   TBD

11.  References

11.1.  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-18 (work in progress), December 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.

   [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,
              <https://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,
              <https://www.rfc-editor.org/info/rfc7519>.




Wendt & Barnes            Expires July 21, 2018                 [Page 6]


Internet-Draft                   shaken                     January 2018


11.2.  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,
              <https://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,
              <https://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























Wendt & Barnes            Expires July 21, 2018                 [Page 7]


Html markup produced by rfcmarkup 1.129c, available from https://tools.ietf.org/tools/rfcmarkup/