draft-ietf-dhc-dhcpv6-radius-opt-10.txt   draft-ietf-dhc-dhcpv6-radius-opt-11.txt 
DHC Working Group L. Yeh DHC Working Group L. Yeh
Internet-Draft Freelancer Technologies Internet-Draft Freelancer Technologies
Intended status: Standards Track M. Boucadair Intended status: Standards Track M. Boucadair
Expires: October 5, 2013 France Telecom Expires: October 14, 2013 France Telecom
April 3, 2013 April 12, 2013
RADIUS Option for DHCPv6 Relay Agent RADIUS Option for DHCPv6 Relay Agent
draft-ietf-dhc-dhcpv6-radius-opt-10 draft-ietf-dhc-dhcpv6-radius-opt-11
Abstract Abstract
The DHCPv6 RADIUS option provides a mechanism to exchange The DHCPv6 RADIUS option provides a mechanism to exchange
authorization and identification information between the DHCPv6 relay authorization and identification information between the DHCPv6 relay
agent and the DHCPv6 server. This mechanism is meant for the agent and the DHCPv6 server. This mechanism is meant for the
centralized DHCPv6 server to select the right configuration for the centralized DHCPv6 server to select the right configuration for the
requesting DHCPv6 client based on the authorization information requesting DHCPv6 client based on the authorization information
received from the RADIUS server, which is not co-located with the received from the RADIUS server, which is not co-located with the
DHCPv6 server. The Network Access Server (NAS) acts as DHCPv6 relay DHCPv6 server. The Network Access Server (NAS) acts as DHCPv6 relay
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on October 5, 2013. This Internet-Draft will expire on October 14, 2013.
Copyright Notice Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| option-data (List of RADIUS Attributes) | option-data (List of RADIUS Attributes)
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
option-code TBD option-code TBD
option-len Length of the option-data in octets option-len Length of the option-data in octets
option-data List of one or more RADIUS attributes option-data List of one or more RADIUS attributes
The option-data of OPTION_RADIUS is a list of one or more RADIUS The option-data of OPTION_RADIUS is a list of one or more RADIUS
attributes received in the Access-Accept message from the RADIUS attributes received in the Access-Accept message from the RADIUS
server. Only the attributes listed in the IANA Registry of 'RADIUS server. The OPTION_RADIUS can only contain the RADIUS attributes
attributes permitted in DHCPv6 RADIUS option' SHOULD be included in listed in the IANA Registry of 'RADIUS attributes permitted in DHCPv6
the OPTION_RADIUS. RADIUS option'.
According to the network scenarios described in section 3, the According to the network scenarios described in section 3, the
OPTION_RADIUS SHOULD appear in the RELAY-FORW (12) message relaying OPTION_RADIUS SHOULD appear in the RELAY-FORW (12) message relaying
SOLICIT (1), REQUEST (3) and REBIND (6) from the DHCPv6 client, and SOLICIT (1), REQUEST (3) and REBIND (6) from the DHCPv6 client, and
MAY appear in the RELAY-FORW (12) relaying any other message from the MAY appear in the RELAY-FORW (12) relaying any other message from the
DHCPv6 client. DHCPv6 client.
4.1. RADIUS attributes permitted in DHCPv6 RADIUS option 4.1. RADIUS attributes permitted in DHCPv6 RADIUS option
The RADIUS attributes listed in the below table are recommended as The RADIUS attributes listed in the below table are recommended as
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7. DHCPv6 Client Behavior 7. DHCPv6 Client Behavior
OPTION_RADIUS is only exchanged between the relay agents and the OPTION_RADIUS is only exchanged between the relay agents and the
servers. DHCPv6 clients are not aware of the usage of OPTION_RADIUS. servers. DHCPv6 clients are not aware of the usage of OPTION_RADIUS.
DHCPv6 client MUST NOT send OPTION_RADIUS, and MUST ignore DHCPv6 client MUST NOT send OPTION_RADIUS, and MUST ignore
OPTION_RADIUS if received. OPTION_RADIUS if received.
8. Security Considerations 8. Security Considerations
Known security vulnerabilities of the DHCPv6 and RADIUS protocol MAY Known security vulnerabilities of the DHCPv6 and RADIUS protocol may
apply to its options. Security issues related with DHCPv6 are apply to its options. Security issues related with DHCPv6 are
described in section 23 of [RFC3315]. Security issues related with described in section 23 of [RFC3315]. Security issues related with
RADIUS are described in section 8 of [RFC2865], section 5 of RADIUS are described in section 8 of [RFC2865], section 5 of
[RFC3162]. [RFC3162].
The mechanism described in this document may introduce new attack The mechanism described in this document may introduce new attack
vector against the DHCPv6 server in case the DHCPv6 relay agent is vector against the DHCPv6 server in case the DHCPv6 relay agent is
compromised. By forging the RADIUS attributes contained in the compromised. By forging the RADIUS attributes contained in the
OPTION_RADIUS of the RELAY-FORW (12) messages, the attacker may OPTION_RADIUS of the RELAY-FORW (12) messages, the attacker may
influence the parameter assignment on the DHCPv6 server for the influence the parameter assignment on the DHCPv6 server for the
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