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In order to derive a Domain-Specific Root Key (DSRK) from the
Extended Master Session Key (EMSK) generated as a side-effect of an
Extensible Authentication Protocol (EAP) method, the EAP peer must
discover the name of the domain to which it is attached.
This document specifies a Dynamic Host Configuration
Protocol (DHCP) option designed to allow a DHCP server to inform clients
of the name of the local domain..
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1.
Introduction
2.
Terminology
3.
Option Format
3.1.
DHCPv6 Local Domain Name Option
4.
Appearance of the Option
5.
Client Behavior
6.
Relay Agent Behavior
7.
Server Behavior
8.
Security Considerations
9.
IANA considerations
10.
References
10.1.
Normative References
10.2.
Informative References
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The EAP Re-authentication Protocol (ERP) [RFC5296] (Narayanan, V. and L. Dondeti, “EAP Extensions for EAP Re-authentication Protocol (ERP),” August 2008.) is designed to allow faster re-authentication
of a mobile device which was previously authenticated by means of the
Extensible Authentication Protocol (EAP, [RFC3748] (Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H. Levkowetz, “Extensible Authentication Protocol (EAP),” June 2004.).
Considering that the local root key (e.g., DSRK [RFC5295] (Salowey, J., Dondeti, L., Narayanan, V., and M. Nakhjiri, “Specification for the Derivation of Root Keys from an Extended Master Session Key (EMSK),” August 2008.)) is generated using the local domain name
(LDN), LDN discovery is an important part of re-authentication. As
described in RFC 5296 [RFC5296] (Narayanan, V. and L. Dondeti, “EAP Extensions for EAP Re-authentication Protocol (ERP),” August 2008.), the local domain
name can be learned by the mobile device through the ERP exchange or via
a lower-layer mechanism. However, no lower-layer mechanisms for LDN
discovery have yet been defined.
This document
specifies an extension to DHCP for local domain name discovery.
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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] (Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” March 1997.).
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In DHCPv6-based local domain name discovery, the LDN option is used by the DHCPv6 client (MD) to obtain the local domain name from the DHCP Server after full EAP authentication has taken place.
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The format of this option is:
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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | OPTION_LOCAL_DOMAIN_NAME | option-length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | local-domain-name ... +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1 |
- option code
- OPTION_LOCAL_DOMAIN_NAME (TBD)
- option-length
- Length of the ‘local domain name’ field in octets
- local-domain-name
- This field contains the name of the local domain and MUST be encoded as specified in Section "8 of RFC 3315 (Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C., and M. Carney, “Dynamic Host Configuration Protocol for IPv6 (DHCPv6),” July 2003.) [RFC3315]
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The LDN option MUST NOT appear in DHCPv6 messages other than the types Solicit, Advertise, Request, Information-Request and Reply. The option-code of the LDN option MAY be included in the Option Request Option in the DHCPv6 message types Solicit, Request and Information-Request.
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If a DHCPv6 client (MD) doesn't know the local domain name and requires the DHCP Server to provide the DHCPv6 LDN option, it MUST include an Option Request option requesting the DHCPv6 LDN option, as described in Section 22.7 of RFC 3315 [RFC3315] (Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C., and M. Carney, “Dynamic Host Configuration Protocol for IPv6 (DHCPv6),” July 2003.).
When the DHCPv6 client recieves a LDN option with the local domain name present in it, it MUST verify that the option length is no more than 256 octets (the maximum length of a single FQDN allowed by DNS), and that the local domain name is a properly encoded single FQDN, as specified in Section 8 "Representation and Use of Domain Names" of the RFC3315 [RFC3315] (Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C., and M. Carney, “Dynamic Host Configuration Protocol for IPv6 (DHCPv6),” July 2003.).
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If a DHCPv6 relay agent has pre-existing knowledge of the local domain name (for example, from a previous AAA exchange), it SHOULD include it in the DHCPv6 LDN option and forward to the DHPv6 server.
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If the option code for the LDN option is included in an Option Request option, the server SHOULD return the DHCPv6 LDN option to the client. If a DHCPv6 LDN option is received from a relay agent with a non-empty local-domain-name field, the server SHOULD extract this option and include it in the reply message.
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The communication between the DHCP client and the DHCP server for the exchange of local domain name information is security sensitive and requires authentication, integrity and replay protection. Either lower-layer security (such as link layer security established as part of the network access authentication protocol run) or DHCP security [RFC3118] (Droms, R. and W. Arbaugh, “Authentication for DHCP Messages,” June 2001.) can be used.
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IANA is requested to allocate one DHCPv6 Option code, referencing this document.
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[RFC2119] | Bradner, S., “Key words for use in RFCs to Indicate Requirement Levels,” BCP 14, RFC 2119, March 1997 (TXT, HTML, XML). |
[RFC3315] | Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C., and M. Carney, “Dynamic Host Configuration Protocol for IPv6 (DHCPv6),” RFC 3315, July 2003 (TXT). |
[RFC5295] | Salowey, J., Dondeti, L., Narayanan, V., and M. Nakhjiri, “Specification for the Derivation of Root Keys from an Extended Master Session Key (EMSK),” RFC 5295, August 2008 (TXT). |
[RFC5296] | Narayanan, V. and L. Dondeti, “EAP Extensions for EAP Re-authentication Protocol (ERP),” RFC 5296, August 2008 (TXT). |
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[RFC3118] | Droms, R. and W. Arbaugh, “Authentication for DHCP Messages,” RFC 3118, June 2001 (TXT). |
[RFC3748] | Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H. Levkowetz, “Extensible Authentication Protocol (EAP),” RFC 3748, June 2004 (TXT). |
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Glen Zorn | |
Network Zen | |
1463 East Republican Street | |
Seattle, Washington 98112 | |
USA | |
Phone: | +1 206 931 0768 |
EMail: | gwz@net-zen.net |
Qin Wu | |
Huawei Technologies Co., Ltd. | |
Site B, Floor 12, Huihong Mansion, No.91 Baixia Rd. | |
Nanjing, Jiangsu 21001 | |
China | |
Phone: | +86-25-84565892 |
EMail: | sunseawq@huawei.com |
Yungui Wang | |
Huawei Technologies Co., Ltd. | |
Site B, Floor 10, HuiHong Mansion, No.91 BaiXia Rd. | |
Nanjing, Jiangsu 210001 | |
P.R. China | |
Phone: | +86 25 84565893 |
EMail: | w52006@huawei.com |