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. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on July 16, 2012. Copyright Notice Copyright (c) 2012 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Borenstein & Kucherawy Expires July 16, 2012 [Page 1] Internet-Draft Reputation Queries with HTTP and XML January 2012 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 Borenstein & Kucherawy Expires July 16, 2012 [Page 2] Internet-Draft Reputation Queries with HTTP and XML January 2012 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 Borenstein & Kucherawy Expires July 16, 2012 [Page 3] Internet-Draft Reputation Queries with HTTP and XML January 2012 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: Borenstein & Kucherawy Expires July 16, 2012 [Page 4] Internet-Draft Reputation Queries with HTTP and XML January 2012 {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. Borenstein & Kucherawy Expires July 16, 2012 [Page 5] Internet-Draft Reputation Queries with HTTP and XML January 2012 [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. Borenstein & Kucherawy Expires July 16, 2012 [Page 6] Internet-Draft Reputation Queries with HTTP and XML January 2012 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 Borenstein & Kucherawy Expires July 16, 2012 [Page 7]