Network Working Group J. Howlett
Internet Draft JANET(UK)
Intended status: Informational March 18, 2010
Expires: September 2010
A RADIUS attribute for SAML messages
draft-howlett-radius-saml-attr-00.txt
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Abstract
This document defines the SAML-Message attribute using the Remote
Authentication Dial In User Service (RADIUS). This attribute is used
for encapsulating Security Assertion Mark-up Language (SAML)
messages.
Table of Contents
1. Introduction................................................2
2. Conventions used in this document............................2
3. SAML-Message Attribute.......................................2
4. Security Considerations......................................3
5. IANA Considerations.........................................3
6. References..................................................5
6.1. Normative References....................................5
6.2. Informative References..................................5
7. Acknowledgments.............................................5
1. Introduction
This document defines the SAML-Message attribute for the Remote
Authentication Dial In User Service (RADIUS). This attribute
encapsulates Security Assertion Mark-up Language (SAML) messages.
2. Conventions used in this document
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 RFC-2119 [RFC2119].
3. SAML-Message Attribute
This attribute contains a SAML [Core] message. This attribute MAY be
used with any AAA protocol that makes use of RADIUS attributes, such
as RADIUS [RFC2865] or DIAMETER [RFC3588].
Where multiple SAML-Message attributes are included in an AAA
protocol message (for example, a RADIUS packet), the Message field of
the attributes are to be concatenated to form a SAML message.
A summary of the SAML-Message format is shown below. The fields are
transmitted from left to right.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | MT | Message...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type
TBD
Length
>=4
Message Type (MT)
The Message Type field is a one octet enumerated field. It takes an
integer value denoting the type of SAML message in the Message
field.
TBD SAML Request protocol element
TBD SAML Response protocol element
All other values are reserved for IANA allocation subject to the
provisions of section 5.
Message
The Message field is one or more octets. It contains a SAML message
as defined in [SAMLCore]. If larger than a single attribute, the
SAML message data MUST be split on 253-octet boundaries over as
many attributes as necessary. On reception, the SAML message is
reconstructed by concatenating the contents of all SAML Message
attributes.
4. Security Considerations
TODO
5. IANA Considerations
The following numbers have been assigned in the RADIUS Attribute
Types registry.
A new RADIUS Attribute Type: SAML-Message (TDB)
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The enumerated values of the newly registered RADIUS Attribute Type
as defined in this document were assigned at the same time as the new
Attribute Type.
For the SAML-Message Attribute:
TBD SAML Request protocol element
TBD SAML Response protocol element
Assignments of additional enumerated values for the RADIUS attributes
defined in this document are to be processed as described in
[RFC3575], subject to the additional requirements of a published
specification.
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6. References
6.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
6.2. Informative References
[Core] Cantor, S., Kemp, J., Philpott, R., and E. Maler,
"Assertions and Protocol for the OASIS Security Assertion
Markup Language (SAML) V2.0", OASIS Standard saml-core-2.0-
os, March 2005.
[RFC2865] Rigney, C., Willens, S., Rubens, A. and W. Simpson, "Remote
Authentication Dial In User Service (RADIUS)", RFC 2865,
June 2000.
[RFC3575] Aboba, B., "IANA Considerations for RADIUS (Remote
Authentication Dial In User Service)", RFC 3575, July 2003.
[RFC3588] P. Calhoun, J. Loughney, E. Guttman, G. Zorn, J. Arkko,
"Diameter Base Protocol", RFC 3588, September 2003.
7. Acknowledgments
TODO
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Authors' Addresses
Josh Howlett
JANET(UK)
Email: josh.howlett@ja.net
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