STIR Out-of-Band Architecture and Use Cases
draft-ietf-stir-oob-05
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Network Working Group E. Rescorla
Internet-Draft Mozilla
Intended status: Informational J. Peterson
Expires: January 9, 2020 Neustar
July 8, 2019
STIR Out-of-Band Architecture and Use Cases
draft-ietf-stir-oob-05
Abstract
The PASSporT format defines a token that can be carried by signaling
protocols, including SIP, to cryptographically attest the identify of
callers. Not all telephone calls use Internet signaling protocols,
however, and some calls use them for only part of their signaling
path, or cannot reliably deliver SIP header fields end-to-end. This
document describes use cases that require the delivery of PASSporT
objects outside of the signaling path, and defines architectures and
semantics to provide this functionality.
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 January 9, 2020.
Copyright Notice
Copyright (c) 2019 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
Rescorla & Peterson Expires January 9, 2020 [Page 1]
Internet-Draft STIR Out-of-Band July 2019
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 . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Operating Environments . . . . . . . . . . . . . . . . . . . 4
4. Dataflows . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1. Case 1: VoIP to PSTN Call . . . . . . . . . . . . . . . . 7
5.2. Case 2: Two Smart PSTN endpoints . . . . . . . . . . . . 7
5.3. Case 3: PSTN to VoIP Call . . . . . . . . . . . . . . . . 7
5.4. Case 4: Gateway Out-of-band . . . . . . . . . . . . . . . 8
5.5. Case 5: Enterprise Call Center . . . . . . . . . . . . . 8
6. Storing and Retrieving PASSporTs . . . . . . . . . . . . . . 9
6.1. Storage . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.2. Retrieval . . . . . . . . . . . . . . . . . . . . . . . . 11
7. Solution Architecture . . . . . . . . . . . . . . . . . . . . 12
7.1. Credentials and Phone Numbers . . . . . . . . . . . . . . 12
7.2. Call Flow . . . . . . . . . . . . . . . . . . . . . . . . 12
7.3. Security Analysis . . . . . . . . . . . . . . . . . . . . 13
7.4. Substitution Attacks . . . . . . . . . . . . . . . . . . 14
7.5. Rate Control for CPS Storage . . . . . . . . . . . . . . 15
8. Authentication and Verification Service Behavior for Out-of-
Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8.1. Authentication Service . . . . . . . . . . . . . . . . . 16
8.2. Verification Service . . . . . . . . . . . . . . . . . . 17
8.3. Gateway Placement Services . . . . . . . . . . . . . . . 18
9. Example HTTPS Interface to the CPS . . . . . . . . . . . . . 19
10. CPS Discovery . . . . . . . . . . . . . . . . . . . . . . . . 21
11. Encryption Key Lookup . . . . . . . . . . . . . . . . . . . . 22
12. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 23
13. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23
14. Security Considerations . . . . . . . . . . . . . . . . . . . 23
15. Informative References . . . . . . . . . . . . . . . . . . . 24
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 26
1. Introduction
The STIR problem statement [RFC7340] describes widespread problems
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