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Versions: 00 01 02 03 04 05 06 07 RFC 7566

appsawg                                                          L. Goix
Internet-Draft                                            Telecom Italia
Intended status: Experimental                                      K. Li
Expires: December 20, 2014                           Huawei Technologies
                                                           June 18, 2014

                 ENUM Service Registration for acct URI


   This document registers a Telephone Number Mapping (ENUM) service for
   'acct:' URIs (Uniform Resource Identifiers).

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on December 20, 2014.

Copyright Notice

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Use cases . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     3.1.  Reverse phone lookup  . . . . . . . . . . . . . . . . . .   2
     3.2.  Routing of mobile social communications . . . . . . . . .   3
   4.  IANA Registration . . . . . . . . . . . . . . . . . . . . . .   3
   5.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   6.  DNS Considerations  . . . . . . . . . . . . . . . . . . . . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     10.2.  Informative References . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   ENUM (E.164 Number Mapping, [RFC6116]) is a system that uses DNS
   (Domain Name Service, [RFC1034]) to translate telephone numbers, such
   as '+44 1632 960123', into URIs (Uniform Resource Identifiers,
   [RFC3986]), such as 'acct: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.

   [I-D.ietf-appsawg-acct-uri] defines the 'acct' URI scheme as a way to
   identify a user's account at a service provider.

   This document registers an Enumservice for advertising acct URI
   information associated with an E.164 number.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   document are to be interpreted as described in [RFC2119].

3.  Use cases

3.1.  Reverse phone lookup

   In this example, an address book application could issue ENUM queries
   looking for 'acct' URIs corresponding to phone numbers.  This could
   be used to display the account identifier as well as an icon based on
   the host (domain) portion of that URI.

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   Similarly, an endpoint could trigger this resolution process during
   inbound and/or outbound calls to discover an account associated with
   the remote party.

   In general the provision of an ENUM record to map a phone number into
   an account may be useful for businesses or professional workers to
   identify themselves publicly (in a similar way as vCard enum

3.2.  Routing of mobile social communications

   The Open Mobile Alliance (OMA) develops mobile service enabler
   specifications, which support the creation of interoperable end-to-
   end mobile services independent of the underlying wireless platforms,
   such as GSM (Global System for Mobile communications), UMTS
   (Universal Mobile Telecommunications System) and LTE (Long Term
   Evolution) mobile networks.  The OMA Social Network Web (SNeW)
   Enabler Release [OMA-SNeW] has introduced a number of Social
   Networking functionalities for mobile subscribers identified by their
   MSISDN (Mobile Subscriber Integrated Services Digital Network number,
   a number uniquely identifying a subscription in a mobile network),
   amongst which is the ability to follow each other's social activities
   across service providers.

   Such functionality requires the global resolution of the MSISDN to
   the corresponding account and provider, in an analogous way as MMS
   routing, to identify the target endpoint for the related messages.
   Although alternatives solutions exist (e.g. based on mobile network
   operations and/or proprietary lookup techniques), ENUM provides a
   globally accessible mechanism for enabling resolution from network
   entities on behalf of an endpoint, or from an endpoint itself.

   For example, a user of a service provider could request to follow the
   social activities of user '+44 1632 960123'.  The home SNEW Server of
   the former user could perform an ENUM query to identify the 'acct'
   URI corresponding to that phone number.  Based on the resulting URI,
   the server could then identify the SNEW Server of the target user and
   route the original user's request to the appropriate endpoint.

   A similar mechanism can apply to other types of social networking-
   related messages or other communications targeted to a mobile

4.  IANA Registration

   As defined in [RFC6117], the following is a template covering
   information needed for the registration of the Enumservice specified
   in this document:

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                <class>Application-Based, Ancillary</class>
                    This Enumservice indicates that the resource
                    can be identified by the associated 'acct' URI
   <xref target='I-D.ietf-appsawg-acct-uri' />.
                  For DNS considerations in avoiding loops when
                  searching for "acct" NAPTRs,
                  see <xref type="rfc" data="rfcTHIS"/>,
                  <xref target="dns">Section 6</xref>.
                  For security considerations,
                  see <xref type="rfc" data="rfcTHIS"/>,
                  <xref target="security">Section 7</xref>.
                  <xref type="rfc" data="rfcTHIS"/>
                  <xref type="person" data="Laurent_Walter_Goix"/>

                <person id="Laurent_Walter_Goix">
                  <name>Laurent-Walter Goix</name>
                  <org>Telecom Italia</org>

   [Note for RFC-Editor: Please replace any instance of rfcTHIS with the
   RFC number of this document before publication]

5.  Examples

   The following is an example of the use of the Enumservice registered
   by this document in a NAPTR resource record for phone number +44 1632


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   IN NAPTR 10 100 "u" "E2U+acct" "!^.*$!acct:441632960123@foo.com!" .

   IN NAPTR 10 101 "u" "E2U+acct" "!^.*$!acct:john.doe@example.com!" .

   Note that in the first record, the revealed information is limited to
   the domain of the service provider serving that user as the userpart
   of the acct URI simply replicates the phone number.

6.  DNS Considerations

   There may not be any "E2U+acct" NAPTRs returned in response to the
   original ENUM query on the requested telephone number, but other
   terminal ENUM NAPTRs that include tel: URLs [RFC3966] (e.g.,
   "voice:tel" or "pstn:tel" or "SMS:tel" or "MMS:tel" - see [RFC6118])
   may be present.

   The application that made that ENUM query may choose to re-submit
   ENUM queries for any E.164 numbers included in those returned
   terminal NAPTRs.  Doing so may cause a query loop (e.g., the ENUM
   records returned from subsequent queries may refer to the telephone
   number already considered).  If applications choose to perform
   subsequent ENUM queries using telephone numbers retrieved from
   earlier queries, these applications MUST be aware of the potential
   for query loops, and MUST be prepared to abort the set of queries if
   such a loop is detected.

   This is a similar issue to the referential loop issue caused by
   processing non-terminal NAPTR queries, as mentioned in section 5.2.1
   of [RFC6116], and a similar technique to mitigate this issue can be
   used; an application searching for records with "acct" Enumservice
   may consider that submitting a chain of more that 5 ENUM queries
   without finding such a record indicates that a referential loop has
   been entered, and the chain of queries SHOULD be abandoned.

7.  Security Considerations

   DNS, as used by ENUM, is a global, distributed database.  Should
   implementers of this specification use e164.arpa or any other
   publicly available domain as the tree for maintaining PSTN
   Enumservice data, this information would be visible to anyone

   Carriers, service providers, and other users may choose not to
   publish such information in the public e164.arpa tree.  They may
   instead simply publish this in an internal ENUM infrastructure that
   is only able to be queried by trusted elements of their network, thus
   limiting threats.

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   For security considerations that apply to all Enumservices, please
   refer to [RFC6116], section 7.

   It is important to note that the ENUM record itself does not need to
   contain any personal information but only contains a pointer to an
   account identifier.  This identifier may be queried to discover
   pointers to personal information (e.g.  social network information)
   endpoints and an authorisation mechanism may be in place in that
   context with any level of granularity although it is out of scope of
   this document.

   Technically, ENUM records themselves could contain pointers to the
   same endpoints.  However the visibility of ENUM records cannot be
   controlled based on the requesting entity.  In that context the
   simple mapping of the phone number to the account identifier,
   notwithstanding the disclosure of the association itself, still
   enables the reuse of more advanced access policies.

   Revealing an 'acct' 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.

   Unlike a traditional telephone number, the endpoint identified by an
   'acct' URI may require that requesting entities provide cryptographic
   credentials for authentication and authorization before messages are
   exchanged.  ENUM can actually provide far greater protection from
   unwanted requesting entities than does the existing PSTN, despite the
   public availability of ENUM records.

   More serious security concerns are associated with potential attacks
   against an underlying system (for example, social network system)
   using the 'acct' URI.  For this reason, underlying system should have
   a number of security requirements that call for authentication,
   integrity and confidentiality properties, and similar measures to
   prevent such attacks.  And this is out of scope of this document.

8.  IANA Considerations

   This document requests the IANA registration of the Enumservice with
   Type "acct" according to the definitions in this document, [RFC6116]
   and [RFC6117].

   Details of the registration are given in Section 4.

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9.  Acknowledgements

   The authors would like to thank Gonzalo Salgueiro, Paul Jones,
   Lawrence Conroy, Enrico Marocco, Bert Greevenbosch and Bernie
   Hoeneisen for their valuable feedback to improve this document.

10.  References

10.1.  Normative References

              Saint-Andre, P., "The 'acct' URI Scheme", draft-ietf-
              appsawg-acct-uri-07 (work in progress), January 2014.

   [RFC1034]  Mockapetris, P., "Domain names - concepts and facilities",
              STD 13, RFC 1034, November 1987.

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

   [RFC2617]  Franks, J., Hallam-Baker, P., Hostetler, J., Lawrence, S.,
              Leach, P., Luotonen, A., and L. Stewart, "HTTP
              Authentication: Basic and Digest Access Authentication",
              RFC 2617, June 1999.

   [RFC3966]  Schulzrinne, H., "The tel URI for Telephone Numbers", RFC
              3966, December 2004.

   [RFC3986]  Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform
              Resource Identifier (URI): Generic Syntax", STD 66, RFC
              3986, January 2005.

   [RFC6116]  Bradner, S., Conroy, L., and K. Fujiwara, "The E.164 to
              Uniform Resource Identifiers (URI) Dynamic Delegation
              Discovery System (DDDS) Application (ENUM)", RFC 6116,
              March 2011.

   [RFC6117]  Hoeneisen, B., Mayrhofer, A., and J. Livingood, "IANA
              Registration of Enumservices: Guide, Template, and IANA
              Considerations", RFC 6117, March 2011.

   [RFC6118]  Hoeneisen, B. and A. Mayrhofer, "Update of Legacy IANA
              Registrations of Enumservices", RFC 6118, March 2011.

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10.2.  Informative References

              Open Mobile Alliance, "Social Network Web Enabler", OMA-
              release_program/snew_v1_0.aspx, Aug 2013.

Authors' Addresses

   Laurent-Walter Goix
   Telecom Italia
   Via Golgi, 42
   Milano  20133

   Email: laurentwalter.goix@telecomitalia.it

   Kepeng Li
   Huawei Technologies
   Huawei Base, Bantian, Longgang District
   Shenzhen  518129
   P. R. China

   Phone: +86-755-28971807
   Email: likepeng@huawei.com

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