Captive Portal API
draft-ietf-capport-api-07

Document Type Active Internet-Draft (capport WG)
Last updated 2020-05-13 (latest revision 2020-04-27)
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state Submitted to IESG for Publication
Document shepherd Martin Thomson
Shepherd write-up Show (last changed 2020-04-20)
IESG IESG state IESG Evaluation
Consensus Boilerplate Yes
Telechat date On agenda of 2020-06-11 IESG telechat
Needs 8 more YES or NO OBJECTION positions to pass.
Responsible AD Barry Leiba
Send notices to Martin Thomson <mt@lowentropy.net>
IANA IANA review state IANA OK - Actions Needed
Captive Portal Interaction                                 T. Pauly, Ed.
Internet-Draft                                                Apple Inc.
Intended status: Standards Track                         D. Thakore, Ed.
Expires: 29 October 2020                                       CableLabs
                                                           27 April 2020

                           Captive Portal API
                       draft-ietf-capport-api-07

Abstract

   This document describes an HTTP API that allows clients to interact
   with a Captive Portal system.  With this API, clients can discover
   how to get out of captivity and fetch state about their Captive
   Portal sessions.

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 29 October 2020.

Copyright Notice

   Copyright (c) 2020 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 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.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Workflow  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  API Connection Details  . . . . . . . . . . . . . . . . . . .   3
     4.1.  Server Authentication . . . . . . . . . . . . . . . . . .   4
   5.  API State Structure . . . . . . . . . . . . . . . . . . . . .   5
   6.  Example Interaction . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     7.1.  Privacy Considerations  . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Captive Portal API JSON Media Type Registration . . . . .   8
     8.2.  Captive Portal API Keys Registry  . . . . . . . . . . . .   9
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     10.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   This document describes a HyperText Transfer Protocol (HTTP)
   Application Program Interface (API) that allows clients to interact
   with a Captive Portal system.  The API defined in this document has
   been designed to meet the requirements in the Captive Portal
   Architecture [I-D.ietf-capport-architecture].  Specifically, the API
   provides:

   *  The state of captivity (whether or not the client has access to
      the Internet)

   *  A URI that a client browser can present to a user to get out of
      captivity

   *  An encrypted connection (using TLS for connections to both the API
      and user portal)

2.  Terminology

   This document leverages the terminology and components described in
   [I-D.ietf-capport-architecture] and additionally defines the
   following terms:

   *  Captive Portal Client: The client that interacts with the Captive
      Portal API is typically some application running on the User
      Equipment that is connected to the Captive Network.  This is also
      referred to as the "client" in this document.

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   *  Captive Portal API Server: The server exposing the APIs defined in
      this document to the client.  This is also referred to as the "API
      server" in this document.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
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