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Versions: 00 01 02 RFC 5397

Network Working Group                                         W. Sanchez
Internet-Draft                                                  C. Daboo
Expires: November 14, 2008                                    Apple Inc.
                                                            May 13, 2008


                   WebDAV Current Principal Extension
               draft-sanchez-webdav-current-principal-00

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Abstract

   This specification defines a new WebDAV property that allows clients
   to quickly determine the principal corresponding to the current
   authenticated user.












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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Conventions Used in This Document . . . . . . . . . . . . . . . 3
   3.  DAV:current-user-principal-resource . . . . . . . . . . . . . . 3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5
   7.  Normative References  . . . . . . . . . . . . . . . . . . . . . 5










































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1.  Introduction

   WebDAV [RFC4918] is an extension to HTTP [RFC2616] to support
   improved document authoring capabilities.  The WebDAV ACL [RFC3744]
   extension adds access control capabilities to WebDAV.  It introduces
   the concept of a "principal resource" which is used to represent
   information about authenticated entities on the system.

   Some clients have a need to determine the [RFC3744] principal that a
   server is associating with the currently authenticated HTTP user.
   While [RFC3744] defines a DAV:current-user-privilege-set property for
   retrieving the privileges granted to that principal, there is no
   recommended way to do identify the principal in question, which is
   necessary to perform other useful operations.  For example, a client
   may wish to determine which groups the current user is a member of,
   or modify a property of the principal resource associated with the
   current user.

   The DAV:principal-match REPORT provides some useful functionality,
   but there are common situations where the results from that query can
   be ambiguous (e.g. not only is an individual user principal returned,
   but also every group principal that the user is a member of, and
   there is no clear way to distinguish which is which).

   This specification proposes an extension to WebDAV ACL that adds a
   DAV:current-user-principal-resource property to all resources under
   access control on the server.  This property contains a single DAV:
   href element whose value is a URL to the principal resource
   corresponding to the currently authenticated user.

2.  Conventions Used in This Document

   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].

   When XML element types in the namespace "DAV:" are referenced in this
   document outside of the context of an XML fragment, the string "DAV:"
   will be prefixed to the element type names.

3.  DAV:current-user-principal-resource

   Name:  current-user-principal-resource

   Namespace:  DAV:






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   Purpose:  Indicates a URL for the current authenticated user's
      principal resource on the server.

   Value:  Single DAV:href element.

   Protected:  This property is computed on a per-request basis, and
      therefore is protected.

   Description:  The DAV:current-user-principal-resource property
      contains either a DAV:href or DAV:unauthenticed XML element.  The
      DAV:href element contains a URL to a principal resource
      corresponding to the currently authenticated user.  That URL MUST
      be one of the URLs in the DAV:principal-URL or DAV:alternate-URI-
      set properties defined on the principal resource and MUST be an
      http(s) scheme URL.  When authentication has not been done or has
      failed, this property MUST contain the DAV:unauthenticated pseudo-
      principal.

      In some cases there may be multiple principal resources
      corresponding to the same authenticated principal.  In that case
      the server is free to choose any one of the principal resource
      URIs for the value of the DAV:current-user-principal-resource
      property.  However, servers SHOULD be consistent and use the same
      principal resource URI for each authenticated principal.

   COPY/MOVE behavior:  This property is computed on a per-request
      basis, and is thus never copied or moved.

   Definition:

      <!ELEMENT current-user-principal-resource (DAV:unauthenticated |
                                                 DAV:href)>
      DAV:href value: a URL to a principal resource

   Example:

      <D:current-user-principal-resource xmlns:D="DAV:">
        <D:href>/principals/users/cdaboo</D:href>
      </D:current-user-principal-resource>

4.  Security Considerations

   This specification does not introduce any additional security issues
   beyond those defined in HTTP [RFC2616], WebDAV [RFC4918] and WebDAV
   ACL [RFC3744].






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5.  IANA Considerations

   This document does not require any actions on the part of IANA.

6.  Acknowledgments

   This specification was suggested by discussion that took place within
   the Calendaring and Scheduling Consortium's CalDAV Technical
   Committee.  The authors thank the participants of that group for
   their input.

7.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2616]  Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
              Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
              Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.

   [RFC3744]  Clemm, G., Reschke, J., Sedlar, E., and J. Whitehead, "Web
              Distributed Authoring and Versioning (WebDAV)
              Access Control Protocol", RFC 3744, May 2004.

   [RFC4918]  Dusseault, L., "HTTP Extensions for Web Distributed
              Authoring and Versioning (WebDAV)", RFC 4918, June 2007.

Authors' Addresses

   Wilfredo Sanchez
   Apple Inc.
   1 Infinite Loop
   Cupertino, CA  95014
   USA

   EMail: wsanchez@wsanchez.net
   URI:   http://www.apple.com/


   Cyrus Daboo
   Apple Inc.
   1 Infinite Loop
   Cupertino, CA  95014
   USA

   EMail: cyrus@daboo.name
   URI:   http://www.apple.com/




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