One document matched: draft-aboba-radext-wlan-03.txt
Differences from draft-aboba-radext-wlan-02.txt
Network Working Group Bernard Aboba
INTERNET-DRAFT Microsoft
Category: Proposed Standard
<draft-aboba-radext-wlan-03.txt>
13 June 2006
RADIUS Attributes for WLAN
By submitting this Internet-Draft, each author represents that any
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This Internet-Draft will expire on December 10, 2006.
Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document proposes additional attributes for use by IEEE 802.11
authenticators. The attributes defined in this document are usable
both within RADIUS and Diameter.
Aboba Proposed Standard [Page 1]
INTERNET-DRAFT RADIUS Attributes for WLAN 13 June 2006
Table of Contents
1. Introduction .......................................... 3
1.1 Terminology ..................................... 3
1.2 Requirements Language ........................... 4
2. RADIUS Attributes ..................................... 4
2.1 Allowed-SSID .................................... 4
2.2 SSID ............................................ 5
2.3 Allowed-Called-Station-Id ....................... 5
2.4 EAP-Key-Name .................................... 6
2.5 EAP-Peer-Id ..................................... 7
2.6 EAP-Server-Id ................................... 8
2.7 Mobility-Domain-Id .............................. 9
2.8 Preauth-Timeout ................................. 9
3. Table of Attributes ................................... 10
4. Diameter Considerations ............................... 11
5. IANA Considerations ................................... 12
6. Security Considerations ............................... 12
7. References ............................................ 12
7.1 Normative References .................................. 12
7.2 Informative References ................................ 13
ACKNOWLEDGMENTS .............................................. 13
AUTHORS' ADDRESSES ........................................... 14
Intellectual Property Statement .............................. 14
Disclaimer of Validity ....................................... 14
Copyright Statement .......................................... 15
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1. Introduction
In situations where it is desirable to centrally manage
authentication, authorization and accounting (AAA) for IEEE 802.11
wireless LANs, deployment of a backend authentication and accounting
server is desirable. In such situations, it is expected that IEEE
802.11 authenticators will function as AAA clients. This document
defines additional attributes suitable for usage by IEEE 802.11
authenticators acting as AAA clients. The attributes defined in this
document are usable both within RADIUS and Diameter.
1.1. Terminology
This document uses the following terms:
Access Point (AP)
A Station that provides access to the distribution services
via the wireless medium for associated Stations.
Association
The service used to establish Access Point/Station mapping and
enable Station invocation of the distribution system services.
authenticator
An authenticator is an entity that require authentication from
the supplicant. The authenticator may be connected to the
supplicant at the other end of a point-to-point LAN segment or
802.11 wireless link.
authentication server
An authentication server is an entity that provides an
authentication service to an authenticator. This service
verifies from the credentials provided by the supplicant, the
claim of identity made by the supplicant.
Station (STA)
Any device that contains an IEEE 802.11 conformant medium
access control (MAC) and physical layer (PHY) interface to the
wireless medium (WM).
Supplicant
A supplicant is an entity that is being authenticated by an
authenticator. The supplicant may be connected to the
authenticator at one end of a point-to-point LAN segment or
802.11 wireless link.
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1.2. Requirements Language
In this document, several words are used to signify the requirements
of the specification. 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
[RFC2119].
2. RADIUS Attributes
2.1. Allowed-SSID
Description
The Allowed-SSID attribute allows the RADIUS server to specify
which SSIDs the user is allowed to access. This may be useful in
situations where the SSID is not yet known (such as in pre-
authentication), or where subsequent handoff can occur without
interaction with a AAA server. One or more Allowed-SSID
attributes MAY be included an Access-Accept or CoA-Request packet.
This attribute is not allowed in other RADIUS packets. A summary
of the Allowed-SSID attribute format is shown below. The fields
are transmitted from left to right.
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 | String...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Code
TBD
Length
>=3
String
The String field contains one or more octets, encoding a single
SSID, as defined in [IEEE-802.11]. If the SSID included in the
Allowed-SSID attribute is not supported by the NAS, the attribute
is silently discarded. UTF-8 encoded 10646 characters are
recommended, but a robust implementation SHOULD support the field
as undistinguished octets.
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2.2. SSID
Description
The SSID attribute allows the NAS to specify which SSID the user
is attempting to access. A single SSID attribute MAY be included
in an Access-Request packet. This attribute is not allowed in
other RADIUS packets. A summary of the SSID attribute is shown
below. The fields are transmitted from left to right.
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 | String...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Code
TBD
Length
>=3
String
The String field contains one or more octets, encoding a single
SSID, as defined in [IEEE-802.11]. UTF-8 encoded 10646 characters
are recommended, but a robust implementation SHOULD support the
field as undistinguished octets.
2.3. Allowed-Called-Station-ID
Description
The Allowed-Called-Station-ID attribute allows the RADIUS server
to specify which Called-Station-IDs the user is allowed to access.
More than one Allowed-Called-Station-ID attribute MAY be included
in an Access-Accept or CoA-Request packet. This attribute is not
allowed in other RADIUS packets. A summary of the Allowed-Called-
Station-ID attribute format is shown below. The fields are
transmitted from left to right.
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 | String...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Code
TBD
Length
>=3
String
The String field is one or more octets, containing the layer 2
endpoint that the user's call terminated on. For details of the
encoding, see [RFC2865] and [RFC3580]. Note that this attribute
MUST NOT include the SSID. If the Called-Station-ID included in
the Allowed-Called-Station-ID attribute does not describe a layer
2 endpoint of the NAS, the attribute is silently discarded. A
robust implementation SHOULD support the field as undistinguished
octets.
2.4. EAP-Key-Name
Description
The EAP-Key-Name attribute, defined in [RFC4072], contains the EAP
Session-ID, as described in [KEYFRAME]. Exactly how this
attribute is used depends on the link layer in question.
It should be noted that not all link layers use this name and
existing EAP method implementations do not generate it. An EAP-
Key-Name attribute MAY only be included within Access-Request,
Access-Accept and CoA-Request packets. A summary of the EAP-Key-
Name attribute format is shown below. The fields are transmitted
from left to right.
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 | String...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Code
102 [RFC4072]
Length
>=2
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String
The String field, when present, is one or more octets, containing
the EAP Session-ID, as defined in [KEYFRAME]. Since the NAS
operates as a pass-through in EAP, it cannot know the EAP Session-
ID before receiving it from the RADIUS server. As a result, an
EAP-Key-Name attribute sent in an Access-Request MUST NOT contain
any data. A RADIUS server receiving an Access-Request with an
EAP-Key-Name attribute containing data MUST silently discard the
attribute. In addition, the RADIUS server SHOULD include this
attribute in an Access-Accept or CoA-Request only if an EAP-Key-
Name attribute was present in the Access-Request.
2.5. EAP-Peer-Id
Description
The EAP-Peer-Id attribute contains an the Peer-Id generated by the
EAP method. Exactly how this name is used depends on the link
layer in question. See [KEYFRAME] for more discussion. The EAP-
Peer-Id attribute is only allowed in Access-Request and Access-
Accept packets.
It should be noted that not all link layers use this name, and
existing EAP method implementations do not generate it. Since the
NAS operates as a pass-through in EAP, it cannot know the EAP-
Peer-Id before receiving it from the RADIUS server. As a result,
an EAP-Peer-Id attribute sent in an Access-Request MUST NOT
contain any data. A home RADIUS server receiving an Access-
Request an EAP-Peer-Id attribute with non-empty data MUST silently
discard the attribute. In addition, the home RADIUS server SHOULD
include this attribute an Access-Accept only if an empty EAP-Peer-
Id attribute was present in the Access-Request. A summary of the
EAP-Peer-Id attribute format is shown below. The fields are
transmitted from left to right.
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 | String...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Code
TBD
Length
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>=2
String
The String field, when present, is one or more octets containing
the EAP Peer-Id exported by the EAP method. For details, see
[KEYFRAME] Appendix A. A robust implementation SHOULD support the
field as undistinguished octets.
2.6. EAP-Server-Id
Description
The EAP-Server-Id attribute contains the Server-Id generated by
the EAP method. Exactly how this name is used depends on the link
layer in question. See [KEYFRAME] for more discussion. The EAP-
Server-Id attribute is only allowed in Access-Request and Access-
Accept packets.
It should be noted that not all link layers use this name, and
existing EAP method implementations do not generate it. Since the
NAS operates as a pass-through in EAP, it cannot know the EAP-
Server-Id before receiving it from the RADIUS server. As a
result, an EAP-Server-Id attribute sent in an Access-Request MUST
NOT contain any data. A home RADIUS server receiving in an
Access-Request an EAP-Server-Id attribute with non-empty data MUST
silently discard the attribute. In addition, the home RADIUS
server SHOULD include this attribute an Access-Accept only if an
empty EAP-Server-Id attribute was present in the Access-Request.
A summary of the EAP-Server-Id attribute format is shown below.
The fields are transmitted from left to right.
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 | String...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Code
TBD
Length
>=2
String
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The String field, when present, is one or more octets, containing
the EAP Server-Id exported by the EAP method. For details, see
[KEYFRAME] Appendix A. A robust implementation SHOULD support the
field as undistinguished octets.
2.7. Mobility-Domain-Id
Description
A single Mobility-Domain-Id attribute MAY be included in an
Access-Request or Accounting-Request, in order to enable the NAS
to provide the RADIUS server with the Mobility Domain Identifier,
defined in [IEEE-802.11r]. A summary of the Mobility-Domain-Id
attribute format is shown below. The fields are transmitted from
left to right.
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 | String...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Code
TBD
Length
>=3
String
The String field contains one or more octets, encoding a single
Mobility Domain Identifier as defined in [IEEE-802.11r]. UTF-8
encoded 10646 characters are recommended, but a robust
implementation SHOULD support the field as undistinguished octets.
2.8. Preauth-Timeout
Description
This attribute sets the maximum number of seconds which pre-
authentication state is kept by the NAS. This attribute is
available to be sent by the server to the client in an Access-
Accept. It also MAY be sent by the client to the server in an
Access-Request in order to indicate a preauthentication request
and provide a hint. Where both Session-Timeout and Preauth-
Timeout attributes are present in an Access-Accept, the Session-
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Timeout attribute refers only to the maximum session time after
the session is started. A summary of the Preauth-Timeout
attribute format is shown below. The fields are transmitted from
left to right.
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 | Value
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Value (cont) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Code
TBD
Length
6
Value
The field is 4 octets, containing a 32-bit unsigned integer with
the maximum number of seconds that pre-authentication state should
be retained by the NAS.
3. Table of Attributes
The following table provides a guide to which attributes may be found
in which kinds of packets, and in what quantity.
Access- Access- Access- Access- CoA- Acct-
Request Accept Reject Challenge Req Req # Attribute
0 0+ 0 0 0+ 0 TBD Allowed-SSID
0-1 0 0 0 0 0-1 TBD SSID
0 0+ 0 0 0+ 0 TBD Allowed-Called-Station-Id
0-1 0-1 0 0 0-1 0 102 EAP-Key-Name
0-1 0-1 0 0 0 0 TBD EAP-Peer-Id
0-1 0-1 0 0 0 0-1 TBD EAP-Server-Id
0-1 0 0 0 0 0-1 TBD Mobility-Domain-Id
0-1 0-1 0 0 0 0 TBD Preauth-Timeout
The following table defines the meaning of the above table entries.
0 This attribute MUST NOT be present in packet.
0+ Zero or more instances of this attribute MAY be
present in the packet.
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0-1 Zero or one instance of this attribute MAY be
present in the packet.
4. Diameter Considerations
The EAP-Key-Name attribute is aready defined as a RADIUS attribute
within Diameter EAP [RFC4072].
When used in Diameter, the other attributes defined in this
specification can be used as Diameter AVPs from the Code space 1-255
(RADIUS attribute compatibility space). No additional Diameter Code
values are therefore allocated. The data types and flag rules for
the attributes are as follows:
+---------------------+
| AVP Flag rules |
|----+-----+----+-----|----+
| | |SHLD| MUST| |
Attribute Name Value Type |MUST| MAY | NOT| NOT|Encr|
-------------------------------|----+-----+----+-----|----|
Allowed-SSID OctetString| M | P | | V | Y |
SSID OctetString| M | P | | V | Y |
Allowed-Called- | | | | | |
Station-Id UTF8String | M | P | | V | Y |
EAP-Peer-Id UTF8String | M | P | | V | Y |
EAP-Server-Id UTF8String | M | P | | V | Y |
Mobility-Domain-Id OctetString| | P,M | | V | Y |
Preauth-Timeout Unsigned32 | M | P | | V | Y |
-------------------------------|----+-----+----+-----|----|
The attributes in this specification have no special translation
requirements for Diameter to RADIUS or RADIUS to Diameter gateways;
they are copied as is, except for changes relating to headers,
alignment, and padding. See also [RFC 3588] Section 4.1 and [RFC
4005] Section 9.
What this specification says about the applicability of the
attributes for RADIUS Access-Request packets applies in Diameter to
AA-Request [RFC 4005] or Diameter-EAP-Request [RFC 4072]. What is
said about Access-Challenge applies in Diameter to AA-Answer [RFC
4005] or Diameter-EAP-Answer [RFC 4072] with Result-Code AVP set to
DIAMETER_MULTI_ROUND_AUTH.
What is said about Access-Accept applies in Diameter to AA-Answer or
Diameter-EAP-Answer messages that indicate success. Similarly, what
is said about RADIUS Access-Reject packets applies in Diameter to AA-
Answer or Diameter-EAP-Answer messages that indicate failure.
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What is said about COA-Request applies in Diameter to Re-Auth-Request
[RFC 4005].
What is said about Accounting-Request applies to Diameter Accounting-
Request [RFC 4005] as well.
5. IANA Considerations
This specification requires assignment of a RADIUS attribute types
for the following attributes:
Attribute Type
========= ====
Allowed-SSID TBD
SSID TBD
Allowed-Called-Station-Id TBD
EAP-Peer-Id TBD
EAP-Server-Id TBD
Mobility-Domain-Id TBD
Preauth-Timeout TBD
6. Security Considerations
Since this document describes the use of RADIUS for purposes of
authentication, authorization, and accounting in WLANs, it is
vulnerable to all of the threats that are present in other RADIUS
applications. For a discussion of these threats, see [RFC2607],
[RFC2865], [RFC3162], [RFC3576], [RFC3579], and [RFC3580].
7. References
7.1. Normative references
[IEEE-802.11]
Information technology - Telecommunications and information
exchange between systems - Local and metropolitan area
networks - Specific Requirements Part 11: Wireless LAN Medium
Access Control (MAC) and Physical Layer (PHY) Specifications,
IEEE Std. 802.11-2003, 2003.
[IEEE-802.11r]
Draft Amendment to Standard for Information technology -
Telecommunications and information exchange between systems -
Local and metropolitan area networks - Specific Requirements
Part 11: Wireless LAN Medium Access Control (MAC) and
Physical Layer (PHY) Specifications: Amendment 2: Fast BSS
Transition, IEEE P802.11r/D1.2, February 2006.
Aboba Proposed Standard [Page 12]
INTERNET-DRAFT RADIUS Attributes for WLAN 13 June 2006
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March, 1997.
[RFC2865] Rigney, C., Rubens, A., Simpson, W. and S. Willens, "Remote
Authentication Dial In User Service (RADIUS)", RFC 2865, June
2000.
[RFC3748] Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J. and H.
Levkowetz, "Extensible Authentication Protocol (EAP)", RFC
3748, June 2004.
[RFC4072] Eronen, P., Hiller, T. and G. Zorn, "Diameter Extensible
Authentication Protocol (EAP) Application", RFC 4072, August
2005.
[KEYFRAME]
Aboba, B., Simon, D., Eronen, P. and H. Levkowetz, "EAP Key
Management Framework", draft-ietf-eap-keying-14.txt, June
2006.
7.2. Informative references
[RFC2607] Aboba, B. and J. Vollbrecht, "Proxy Chaining and Policy
Implementation in Roaming", RFC 2607, June 1999.
[RFC3162] Aboba, B., Zorn, G. and D. Mitton, "RADIUS and IPv6", RFC
3162, August 2001.
[RFC3575] Aboba, B., "IANA Considerations for RADIUS", RFC 3575, July
2003.
[RFC3576] Chiba, M., Dommety, G., Eklund, M., Mitton, D. and B. Aboba,
"Dynamic Authorization Extensions to Remote Authentication
Dial In User Service (RADIUS)", RFC 3576, July 2003.
[RFC3579] Aboba, B. and P. Calhoun, "RADIUS Support for Extensible
Authentication Protocol (EAP)", RFC 3579, September 2003.
[RFC3580] Congdon, P., Aboba, B., Smith, A., Zorn, G. and J. Roese,
"IEEE 802.1X Remote Authentication Dial In User Service
(RADIUS) Usage Guidelines", RFC 3580, September 2003.
Acknowledgments
The authors would like to acknowledge Dorothy Stanley of Aruba
Networks and Yoshihiro Ohba of Toshiba.
Aboba Proposed Standard [Page 13]
INTERNET-DRAFT RADIUS Attributes for WLAN 13 June 2006
Authors' Addresses
Bernard Aboba
Microsoft Corporation
One Microsoft Way
Redmond, WA 98052
EMail: bernarda@microsoft.com
Phone: +1 425 706 6605
Fax: +1 425 936 7329
Intellectual Property Statement
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The IETF invites any interested party to bring to its attention any
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Disclaimer of Validity
This document and the information contained herein are provided on an
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ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE
INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Aboba Proposed Standard [Page 14]
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Copyright Statement
Copyright (C) The Internet Society (2006). This document is subject
to the rights, licenses and restrictions contained in BCP 78, and
except as set forth therein, the authors retain all their rights.
Acknowledgment
Funding for the RFC Editor function is currently provided by the
Internet Society.
Open issues
Open issues relating to this specification are tracked on the
following web site:
http://www.drizzle.com/~aboba/RADEXT/
Aboba Proposed Standard [Page 15]
| PAFTECH AB 2003-2026 | 2026-04-23 08:58:24 |