Presence Authorization Rules
RFC 5025

Network Working Group                                       J. Rosenberg
Request for Comments: 5025                                         Cisco
Category: Standards Track                                  December 2007

                     Presence Authorization Rules

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

   Authorization is a key function in presence systems.  Authorization
   policies, also known as authorization rules, specify what presence
   information can be given to which watchers, and when.  This
   specification defines an Extensible Markup Language (XML) document
   format for expressing presence authorization rules.  Such a document
   can be manipulated by clients using the XML Configuration Access
   Protocol (XCAP), although other techniques are permitted.

Table of Contents

   1. Introduction ....................................................2
   2. Terminology .....................................................3
   3. Structure of Presence Authorization Documents ...................3
      3.1. Conditions .................................................4
           3.1.1. Identity ............................................4
                  3.1.1.1. Acceptable Forms of Authentication .........4
                  3.1.1.2. Computing a URI for the Watcher ............5
           3.1.2. Sphere ..............................................6
      3.2. Actions ....................................................7
           3.2.1. Subscription Handling ...............................7
      3.3. Transformations ............................................9
           3.3.1. Providing Access to Data Component Elements .........9
                  3.3.1.1. Device Information .........................9
                  3.3.1.2. Person Information ........................10
                  3.3.1.3. Service Information .......................11
           3.3.2. Providing Access to Presence Attributes ............12
                  3.3.2.1. Provide Activities ........................12
                  3.3.2.2. Provide Class .............................12
                  3.3.2.3. Provide DeviceID ..........................13
                  3.3.2.4. Provide Mood ..............................13
                  3.3.2.5. Provide Place-is ..........................13

Rosenberg                   Standards Track                     [Page 1]
RFC 5025                 Presence Authorization            December 2007

                  3.3.2.6. Provide Place-type ........................13
                  3.3.2.7. Provide Privacy ...........................13
                  3.3.2.8. Provide Relationship ......................14
                  3.3.2.9. Provide Sphere ............................14
                  3.3.2.10. Provide Status-Icon ......................14
                  3.3.2.11. Provide Time-Offset ......................14
                  3.3.2.12. Provide User-Input .......................14
                  3.3.2.13. Provide Note .............................15
                  3.3.2.14. Provide Unknown Attribute ................15
                  3.3.2.15. Provide All Attributes ...................16
   4. When to Apply the Authorization Policies .......................17
   5. Implementation Requirements ....................................17
   6. Example Document ...............................................18
   7. XML Schema .....................................................19
   8. Schema Extensibility ...........................................21
   9. XCAP Usage .....................................................22
      9.1. Application Unique ID .....................................22
      9.2. XML Schema ................................................22
      9.3. Default Namespace .........................................22
      9.4. MIME Type .................................................22
      9.5. Validation Constraints ....................................22
      9.6. Data Semantics ............................................22
      9.7. Naming Conventions ........................................23
      9.8. Resource Interdependencies ................................23
      9.9. Authorization Policies ....................................23
   10. Security Considerations .......................................23
   11. IANA Considerations ...........................................24
      11.1. XCAP Application Usage ID ................................24