Network Working Group R. Sinnema
Internet-Draft E. Wilde
Intended status: Standards Track EMC Corporation
Expires: March 18, 2013 September 14, 2012
eXtensible Access Control Markup Language (XACML) Media Type
draft-sinnema-xacml-media-type-00
Abstract
This specification registers an XML-based media type for the
eXtensible Access Control Markup Language (XACML).
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 March 18, 2013.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. XACML Media Type application/xacml+xml . . . . . . . . . . . . 3
2.1. Media Type Name . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Subtype Name . . . . . . . . . . . . . . . . . . . . . . . 3
2.3. Required Parameters . . . . . . . . . . . . . . . . . . . . 3
2.4. Optional Parameters . . . . . . . . . . . . . . . . . . . . 3
2.5. Encoding Considerations . . . . . . . . . . . . . . . . . . 3
2.6. Security Considerations . . . . . . . . . . . . . . . . . . 3
2.7. Interoperability Considerations . . . . . . . . . . . . . . 4
2.8. Applications which use this media type . . . . . . . . . . 4
2.9. Magic number(s) . . . . . . . . . . . . . . . . . . . . . . 4
2.10. File extension(s) . . . . . . . . . . . . . . . . . . . . . 5
2.11. Macintosh File Type Code(s) . . . . . . . . . . . . . . . . 5
2.12. Person & email address to contact for further
information . . . . . . . . . . . . . . . . . . . . . . . . 5
2.13. Intended Usage . . . . . . . . . . . . . . . . . . . . . . 5
2.14. Author/Change Controller . . . . . . . . . . . . . . . . . 6
3. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1. Versions prior to I-D -00 . . . . . . . . . . . . . . . . . 6
4. Normative References . . . . . . . . . . . . . . . . . . . . . 6
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 7
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1. Introduction
This specification registers an XML-based media type for the
eXtensible Access Control Markup Language (XACML) that will be
registered with the Internet Assigned Numbers Authority (IANA)
following the "Media Type Specifications and Registration Procedures"
[RFC4288].
2. XACML Media Type application/xacml+xml
This specification requests the registration of an XML-based media
type for the eXtensible Access Control Markup Language (XACML).
2.1. Media Type Name
application
2.2. Subtype Name
xacml+xml
2.3. Required Parameters
none
2.4. Optional Parameters
charset: The charset parameter is the same as the charset parameter
of application/xml [RFC3023].
version: The version parameter indicates the version of the XACML
specification. It can be used for content negotiation when dealing
with components that support multiple XACML versions. Its range is
the range of published XACML versions. As of this writing that is:
1.0 [XACML-1], 1.1 [XACML-1.1], 2.0 [XACML-2], and 3.0 [XACML-3].
These and future version identifiers are of the form x.y, where x and
y are decimal numbers with no leading zeros, with x being positive
and y being non-negative.
2.5. Encoding Considerations
Same as for application/xml [RFC3023].
2.6. Security Considerations
Per their specification, application/xacml+xml typed objects do not
contain executable content. However, these objects are XML-based,
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and thus they have all of the general security considerations
presented in section 10 of RFC 3023 [RFC3023].
XACML [XACML-3] contains information whose integrity and authenticity
is important - identity provider and service provider public keys and
endpoint addresses, for example. Sections 9.2.1 Authentication and
9.2.4 Policy integrity in XACML [XACML-3] describe requirements and
considerations for such authentication and integrity protection.
To counter potential issues, the publisher may sign application/
xacml+xml typed objects. Any such signature should be verified by
the recipient of the data - both as a valid signature, and as being
the signature of the publisher. The XACML v3.0 XML Digital Signature
Profile [XACML-3-DSig] describes how to use XML-based digital
signatures with XACML.
Additionally, various of the possible publication protocols, for
example HTTPS, offer means for ensuring the authenticity of the
publishing party and for protecting the policy in transit.
For a more detailed discussion of XACML policy and its security
considerations, please see XACML 3.0 [XACML-3] and the associated XML
Digital Signature Profile [XACML-3].
2.7. Interoperability Considerations
XACML 3.0 uses the urn:oasis:names:tc:xacml:3.0:core:schema:wd-17 XML
namespace URI. XACML 2.0 uses the
urn:oasis:names:tc:xacml:2.0:policy XML namespace URI. Signed XACML
has a wrapping SAML 2.0 assertion [SAML-2], which uses the
urn:oasis:names:tc:SAML:2.0:assertion namespace URI.
Interoperability with SAML is defined by the SAML 2.0 Profile of
XACML [XACML-3-SAML] for all versions of XACML.
2.8. Applications which use this media type
Potentially any application implementing XACML, as well as those
applications implementing specifications based on XACML.
2.9. Magic number(s)
In general, the same as for application/xml [2]. In particular, the
XML document element of the returned object will be one of xacml:
Policy, xacml:PolicySet, context:Request, or context:Response. The
xacml and context prefixes differ for the various versions of XACML
as follows:
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o 1.0 & 1.1: The xacml prefix maps to
urn:oasis:names:tc:xacml:1.0:policy, the context prefix maps to
urn:oasis:names:tc:xacml:1.0:context
o 2.0: The xacml prefix maps to urn:oasis:names:tc:xacml:2.0:policy,
the context prefix maps to urn:oasis:names:tc:xacml:2.0:context
o 3.0: Both the xacml and context prefixes map to the namespace URI
urn:oasis:names:tc:xacml:3.0:core:schema:wd-17
For signed XACML, the XML document element is saml:Assertion, where
the saml prefix maps to the SAML 2.0 namespace URI
urn:oasis:names:tc:SAML:2.0:assertion
2.10. File extension(s)
none
2.11. Macintosh File Type Code(s)
none
2.12. Person & email address to contact for further information
This registration is made on behalf of the OASIS eXtensible Access
Control Markup Language Technical Committee (XACMLTC). Please refer
to the XACMLTC website for current information on committee
chairperson(s) and their contact addresses:
http://www.oasis-open.org/committees/xacml/. Committee members
should submit comments and potential errata to the
xacml@lists.oasis-open.org list. Others should submit them by
filling out the web form located at http://www.oasis-open.org/
committees/comments/form.php?wg_abbrev=xacml.
Additionally, the XACML developer community email distribution list,
xacml-dev@lists.oasis-open.org, may be employed to discuss usage of
the application/xacml+xml MIME media type. The xacml-dev mailing
list is publicly archived here:
http://www.oasis-open.org/archives/xacml-dev/. To post to the xacml-
dev mailing list, one must subscribe to it. To subscribe, visit the
OASIS mailing list page at http://www.oasis-open.org/mlmanage/.
2.13. Intended Usage
Common
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2.14. Author/Change Controller
The XACML specification sets are a work product of the OASIS
eXtensible Access Control Markup Language Technical Committee
(XACMLTC). OASIS and the XACMLTC have change control over the XACML
specification sets.
3. Change Log
Note to RFC Editor: Please remove this section before publication.
3.1. Versions prior to I-D -00
Prior to being published as a I-D document, this document was
published and revised as an OASIS document with the following
versions:
o 2012-02-29 (WD01): Initial revision with one media type.
o 2012-04-23 (WD02): Added JSON media type.
o 2012-04-24 (WD03): Fixed layout, typos, and references. Better
defined the allowable range of values for the version parameter.
4. Normative References
[RFC3023] Murata, M., St. Laurent, S., and D. Kohn, "XML Media
Types", RFC 3023, January 2001.
[RFC4288] Freed, N. and J. Klensin, "Media Type Specifications and
Registration Procedures", BCP 13, RFC 4288, December 2005.
[SAML-2] Organization for the Advancement of Structured Information
Standards, "Security Assertion Markup Language (SAML)
Version 2.0. OASIS Standard", March 2005, <http://
docs.oasis-open.org/security/saml/v2.0/
saml-core-2.0-os.pdf>.
[XACML-1] Organization for the Advancement of Structured Information
Standards, "eXtensible Access Control Markup Language
(XACML) Version 1.0. OASIS Standard", February 2003, <http
://www.oasis-open.org/committees/download.php/2406/
oasis-xacml-1.0.pdf>.
[XACML-1.1]
Organization for the Advancement of Structured Information
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Standards, "eXtensible Access Control Markup Language
(XACML) Version 1.1. OASIS Committee Specification",
August 2003, <http://www.oasis-open.org/committees/xacml/
repository/cs-xacml-specification-1.1.pdf>.
[XACML-2] Organization for the Advancement of Structured Information
Standards, "eXtensible Access Control Markup Language
(XACML) Version 2.0. OASIS Standard", February 2005, <http
://docs.oasis-open.org/xacml/2.0/
access_control-xacml-2.0-core-spec-os.pdf>.
[XACML-3] Organization for the Advancement of Structured Information
Standards, "eXtensible Access Control Markup Language
(XACML) Version 3.0. OASIS Committee Specification 01",
August 2010, <http://docs.oasis-open.org/xacml/3.0/
xacml-3.0-core-spec-cs-01-en.pdf>.
[XACML-3-DSig]
Organization for the Advancement of Structured Information
Standards, "XACML v3.0 XML Digital Signature Profile
Version 1.0. OASIS Committee Specification 01",
August 2010, <http://docs.oasis-open.org/xacml/3.0/
xacml-3.0-dsig-v1-spec-cs-01-en.pdf>.
[XACML-3-SAML]
Organization for the Advancement of Structured Information
Standards, "SAML 2.0 Profile of XACML, Version 2.0. OASIS
Committee Specification 01", August 2010, <http://
docs.oasis-open.org/xacml/3.0/
xacml-profile-saml2.0-v2-spec-cs-01-en.pdf>.
Appendix A. Acknowledgements
The following individuals have participated in the creation of this
specification and are gratefully acknowledged: Erik Rissanen
(Axiomatics) and Jonathan Robie (EMC).
Authors' Addresses
Remon Sinnema
EMC Corporation
Email: remon.sinnema@emc.com
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Erik Wilde
EMC Corporation
Email: erik.wilde@emc.com
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