Reputation Data Interchange using HTTP and XML
draft-ietf-repute-query-http-01

REPUTE Working Group                                       N. Borenstein
Internet-Draft                                                  Mimecast
Intended status: Standards Track                            M. Kucherawy
Expires: July 16, 2012                                         Cloudmark
                                                        January 13, 2012

             Reputation Data Interchange using HTTP and XML
                    draft-ietf-repute-query-http-01

Abstract

   This document defines a mechanism to conduct queries for reputation
   information using the Domain Name System.

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 July 16, 2012.

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Terminology and Definitions . . . . . . . . . . . . . . . . . . 3
     2.1.  Keywords  . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.2.  Other Definitions . . . . . . . . . . . . . . . . . . . . . 3
   3.  Description . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     3.1.  Query . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     3.2.  Response  . . . . . . . . . . . . . . . . . . . . . . . . . 5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   6.  Normative References  . . . . . . . . . . . . . . . . . . . . . 5
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . . . 6
   Appendix B.  Public Discussion  . . . . . . . . . . . . . . . . . . 6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 6

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1.  Introduction

   This memo defines a method to query a reputation data service for
   information about an entity, using the HyperText Transfer Protocol
   (HTTP) as the transport mechanism and XML as the payload format.  It
   is part of a series defining the overall reputation query/response
   structure as well as the concept of reputation "vocabularies" for
   particular applications.

2.  Terminology and Definitions

   This section defines terms used in the rest of the document.

2.1.  Keywords

   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 [KEYWORDS].

2.2.  Other Definitions

   Other terms of importance in this memo are defined in
   [I-D.REPUTE-MODEL].

3.  Description

3.1.  Query

   A reputation query made via [HTTP] encodes the question being asked
   partly in the [URI] and partly within the GET instruction of the
   protocol.

   The components to the question being asked comprise the following:

   o  The subject of the query;

   o  The name of the host, or the IP address, at which the reputation
      service is available;

   o  The name of the reputation application, i.e., the context within
      which the query is being made;

   o  Optionally, name(s) of the specific reputation assertions or
      attributies that are being requested.

   The name of the application MUST be one registered with IANA.  A

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   server receiving a query about an unregistered application or one it
   does not explicitly support MUST return a 404 error code.

   The syntax for the URI portion of the query is constructed using a
   template as per [URI-TEMPLATE].  The following variables MUST be
   available during template expansion:

   application:  The name of the application reputation in whose context
      the request is being made.

   scheme:  The transport scheme the client will be using for the query.

   service:  The hostname or IP address being queried.

   Which scheme(s) can be used depends on how the reputation service
   provider offers its services.  Thus, the template could include a
   specific schema as a fixed string in the template, or it might offer
   it as a variable in the template.  If it is a variable, it is up to
   the client and server to negotiate out-of-band which schemes are
   supported for client queries.  Implementers should be aware that the
   template could include a fixed scheme not supported by the client.

   The following variables are OPTIONAL, but might be required by the
   template presented for a specific service:

   assertion:  A list of one or more specific assertions of interest to
      the client.  If absent, the server MUST infer that all available
      assertion information is being requested.

   passwd:  The "password" portion of a client credential.

   user:  The "user" portion of a client credential.

   Other required or optional query parameters might be defined by
   documents that register new vocabularies with IANA.

   The template is retrieved by requesting the [WELL-KNOWN-URI] "repute-
   template" from the host providing reputation service using HTTP.  The
   server SHOULD return the template in a text/plain reply.  If the
   template cannot be retrieved, the reputation query SHOULD be aborted
   and/or retried at a later time.  The server responding to the
   template request SHOULD include an Expires field indicating a
   duration for which the template should be considered valid by clients
   and not re-queried.  Clients SHOULD adhere to the expiration time
   thus provided or, if none is provided, assume that the template is
   valid for no less than one day and not repeat the query.

   For example, given the following template:

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   {scheme}://{service}/{application}/{subject}/{assertion}

   A query about the use of the domain "example.org" in the "email-id"
   application context to a service run at "example.com", where that
   application declares a required "subject" parameter, requesting the
   "SENDS-SPAM" reputation assertion using HTTP to conduct the query
   with no specific client authentication information would be formed as
   follows:

   http://example.com/email-id/example.org/sends-spam

   Matching of the attribute name(s) MUST be case-insensitive.

3.2.  Response

   The response is expected to be an XML document, contained within a
   "application/reputon" media type object as defined in
   [I-D.REPUTE-MEDIA-TYPE].  The XML schema for the document is also
   specified in that memo.

4.  IANA Considerations

   This memo registers the "repute-template" well-known URI in the Well-
   Known URI registry as defined by [WELL-KNOWN-URI], as follows:

   URI suffix:  repute-template

   Change controller:  IETF

   Specification document(s):  [this memo]

   Related information:  none

5.  Security Considerations

   This memo describes security considerations introduced by the query
   mechanism defined here.

   [TBD]

6.  Normative References

   [HTTP]     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.

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   [I-D.REPUTE-MEDIA-TYPE]
              Borenstein, N. and M. Kucherawy, "A Media Type for
              Reputation Interchange", I-D draft-ietf-repute-media-type,
              June 2011.

   [I-D.REPUTE-MODEL]
              Borenstein, N. and M. Kucherawy, "A Model for Reputation
              Interchange", I-D draft-iet-repute-model, June 2011.

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

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

   [URI-TEMPLATE]
              Gregorio, J., Fielding, R., Hadley, M., Nottingham, M.,
              and D. Orchard, "URI Template",
              I-D draft-gregorio-uritemplate, September 2011.

   [WELL-KNOWN-URI]
              Nottingham, M. and E. Hammer-Lahav, "Defining Well-Known
              Uniform Resource Identifiers (URIs)", RFC 5785,
              April 2010.

Appendix A.  Acknowledgements

   The authors would like to thank the following for their contributions
   to this work: Mark Nottingham, David F. Skoll, and Mykyta
   Yevstifeyev.

Appendix B.  Public Discussion

   Public discussion of this suite of memos takes place on the
   domainrep@ietf.org mailing list.  See
   https://www.ietf.org/mailman/listinfo/domainrep.

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Authors' Addresses

   Nathaniel Borenstein
   Mimecast
   203 Crescent St., Suite 303
   Waltham, MA  02453
   USA

   Phone: +1 781 996 5340
   Email: nsb@guppylake.com

   Murray S. Kucherawy
   Cloudmark
   128 King St., 2nd Floor
   San Francisco, CA  94107
   USA

   Phone: +1 415 946 3800
   Email: msk@cloudmark.com

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