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ENUM WG                                                          R. Mahy
Internet-Draft                                               Plantronics
Expires: December 24, 2006                                 June 22, 2006


  A Telephone Number Mapping (ENUM) Service Registration for Internet
                          Calendaring Services
                draft-ietf-enum-calendar-service-01.txt

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Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   This document registers a Telephone Number Mapping (ENUM) service for
   Internet Calendaring Services.  Specifically, this document focuses
   on provisioning 'mailto:' (iMIP) and 'http:' (CalDAV) URIs in ENUM.

1.  Introduction

   ENUM (E.164 Number Mapping, RFC 3761 [1]) is a system that uses DNS
   (Domain Name Service, RFC 1034 [2]) to translate telephone numbers,



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   such as '+12025332600', into URIs (Uniform Resource Identifiers, RFC
   3986 [3]), such as 'mailto:user@example.com'.  ENUM exists primarily
   to facilitate the interconnection of systems that rely on telephone
   numbers with those that use URIs to identify resources.

   The Guide to Internet Calendaring [9] describes the relationship
   between various internet calendaring specifications like this:
   "iCalendar [4] is the language used to describe calendar objects.
   iTIP [5] [Transport-Independent Interoperability Protocol] describes
   a way to use the iCalendar language to do scheduling. iMIP [6]
   [Message-Based Interoperability Protocol] describes how to do iTIP
   scheduling via e-mail."

   Recently another standard track protocol for calendar and scheduling
   access has appeared.  CalDAV [7] (Calendaring Extensions to WebDAV)
   is a WebDAV [8] (Web-based Distributed Authoring and Versioning)
   based mechanism for manipulating internet calendars, viewing free/
   busy lists, and proposing calendar events.

   The existing 'mailto:' URI scheme (defined in RFC 3986 [3]) is
   already used to address iMIP compatible Calendar Services.  Likewise
   the existing 'http:' and 'https:' URI schemes (defined in RFC 2616
   [10] and RFC 2818 [11]) are already used to address CalDAV compatible
   Calendar Services.

   This document registers an enumservice for advertising internet
   calendaring information associated with an E.164 number, using the
   'mailto:', 'http:', or 'https:' schemes.

2.  ENUM Service Registration - ical

   As defined in RFC 3761 [1], the following is a template covering
   information needed for the registration of the enumservice specified
   in this document:
   Enumservice Name:
      "ical"
   Enumservice Type:
      "ical"
   Enumservice Subtypes:
      N/A
   URI scheme(s):
      "mailto:", "http:", "https:"
   Functional Specification:
      This Enumservice indicates that the resource identified is a URI
      used for Internet Calendaring.  Supported URI schemes are the
      'mailto:' URI for the iMIP [6] protocol, and 'http:' or 'https:'
      URIs for the CalDAV [7] protocol.




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   Security considerations:
      See section 3.
   Intended usage:
      COMMON
   Author:
      Rohan Mahy (rohan@ekabal.com)

3.  Security Considerations

   The Domain Name System (DNS) does not make policy decisions about
   which records it provides to a DNS resolver.  All DNS records must be
   assumed to be available to all inquirers at all times.  The
   information provided within an ENUM record set must therefore be
   considered open to the public -- which is a cause for some privacy
   considerations.

   Revealing a calendaring URI by itself is unlikely to introduce many
   privacy concerns, although, depending on the structure of the URI, it
   might reveal the full name or employer of the target.  The use of
   anonymous URIs mitigates this risk.

   More serious security concerns are associated with potential attacks
   against an underlying calendaring system (for example, unauthorized
   modification or viewing).  For this reason, iTIP discusses a number
   of security requirements (detailed in RFC 2446 [5]) that call for
   authentication, integrity and confidentiality properties, and similar
   measures to prevent such attacks.  Any calendaring protocol used in
   conjunction with a URI scheme currently meets these requirements.
   The use of CalDAV with the 'https:' scheme makes use of TLS [12]
   (Transport Layer Security) to provide server authentication,
   confidentiality, and message integrity.

   Unlike a traditional telephone number, the resource identified by an
   calendaring URI is often already guessable and often requires that
   users provide cryptographic credentials for authentication and
   authorization before calendar data can be exchanged.  Despite the
   public availability of ENUM records, the use of this information to
   reveal an unprotected calendaring resource is unlikely in practice.

4.  IANA Considerations

   This document requests registration of the "iCal" Enumservice
   according to the definitions in this document and RFC 3761 [1].

5.  References






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5.1  Normative References

   [1]  Faltstrom, P. and M. Mealling, "The E.164 to Uniform Resource
        Identifiers (URI) Dynamic Delegation Discovery System (DDDS)
        Application (ENUM)", RFC 3761, April 2004.

   [2]  Mockapetris, P., "Domain names - concepts and facilities",
        STD 13, RFC 1034, November 1987.

   [3]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
        Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986,
        January 2005.

   [4]  Dawson, F. and Stenerson, D., "Internet Calendaring and
        Scheduling Core Object Specification (iCalendar)", RFC 2445,
        November 1998.

   [5]  Silverberg, S., Mansour, S., Dawson, F., and R. Hopson,
        "iCalendar Transport-Independent Interoperability Protocol
        (iTIP) Scheduling Events, BusyTime, To-dos and Journal Entries",
        RFC 2446, November 1998.

   [6]  Dawson, F., Mansour, S., and S. Silverberg, "iCalendar Message-
        Based Interoperability Protocol (iMIP)", RFC 2447,
        November 1998.

   [7]  Dusseault, L., "Calendaring Extensions to WebDAV (CalDAV)",
        draft-dusseault-caldav-12 (work in progress), April 2006.

   [8]  Goland, Y., Whitehead, E., Faizi, A., Carter, S., and D. Jensen,
        "HTTP Extensions for Distributed Authoring -- WEBDAV", RFC 2518,
        February 1999.

5.2  Informational References

   [9]   Mahoney, B., Babics, G., and A. Taler, "Guide to Internet
         Calendaring", RFC 3283, June 2002.

   [10]  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.

   [11]  Rescorla, E., "HTTP Over TLS", RFC 2818, May 2000.

   [12]  Dierks, T. and C. Allen, "The TLS Protocol Version 1.0",
         RFC 2246, January 1999.





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Author's Address

   Rohan Mahy
   Plantronics

   Email: rohan@ekabal.com

Appendix A.  Acknowlegments

   Thanks to Lisa Dusseault for reviewing this document.









































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