Voluntary Application Server Identification for Web Push
draft-ietf-webpush-vapid-00

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Document Type Active Internet-Draft (webpush WG)
Last updated 2016-04-13
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Network Working Group                                         M. Thomson
Internet-Draft                                                   Mozilla
Intended status: Standards Track                             P. Beverloo
Expires: October 9, 2016                                          Google
                                                           April 7, 2016

        Voluntary Application Server Identification for Web Push
                      draft-ietf-webpush-vapid-00

Abstract

   An application server can voluntarily identify itself to a push
   service using the described technique.  This identification
   information can be used by the push service to attribute requests
   that are made by the same application server to a single entity.
   This can used to reduce the secrecy for push subscription URLs by
   being able to restrict subscriptions to a specific application
   server.  An application server is further able include additional
   information the operator of a push service can use to contact the
   operator of the application server.

Status of This Memo

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   This Internet-Draft will expire on October 9, 2016.

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   Copyright (c) 2016 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
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   (http://trustee.ietf.org/license-info) in effect on the date of
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Thomson & Beverloo       Expires October 9, 2016                [Page 1]
Internet-Draft             Self Identification                April 2016

   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Voluntary Identification  . . . . . . . . . . . . . . . .   3
     1.2.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
   2.  Application Server Self-Identification  . . . . . . . . . . .   4
     2.1.  Application Server Contact Information  . . . . . . . . .   4
     2.2.  Example . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  WebPush Authentication Scheme . . . . . . . . . . . . . . . .   5
   4.  Public Key Representation . . . . . . . . . . . . . . . . . .   6
   5.  Subscription Restriction  . . . . . . . . . . . . . . . . . .   6
     5.1.  Creating a Restricted Push Subscription . . . . . . . . .   7
     5.2.  Using Restricted Subscriptions  . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  WebPush Authentication Scheme . . . . . . . . . . . . . .   9
     7.2.  p256ecdsa Parameter for Crypto-Key Header Field . . . . .   9
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   The Web Push protocol [I-D.ietf-webpush-protocol] describes how an
   application server is able to request that a push service deliver a
   push message to a user agent.

   As a consequence of the expected deployment architecture, there is no
   basis for an application server to be known to a push service prior
   to requesting delivery of a push message.  By the same measure,
   requesting the creation of a subscription for push message receipts
   has no prior authentication.  Requiring that the push service be able
   to authenticate application servers places an unwanted constraint on
   the interactions between user agents and application servers, who are
   the ultimate users of a push service.  That constraint would also
   degrade the privacy-preserving properties the protocol provides.  For
   these reasons, [I-D.ietf-webpush-protocol] does not define a
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