Extensible Authentication Protocol (EAP) Mutual Cryptographic Binding (RFC7029)
Original Publication Date: 2013-Oct-01
Included in the Prior Art Database: 2013-Oct-10
Internet Society Requests For Comment (RFCs)
S. Hartman: AUTHOR [+2]
The Extensible Authentication Protocol (EAP) [RFC3748] provides authentication between a peer (a party accessing some service) and a authentication server. Traditionally, peers have not relied significantly on information received from EAP servers. However, facilities such as EAP channel binding [RFC6677] provide the peer with confirmation of information about the resource it is accessing. Other facilities such as EAP Posture Transport [PT-EAP] permit a peer and EAP server to discuss the security properties of accessed networks. Both of these facilities provide peers with information they need to rely on and provide attackers who are able to impersonate an EAP server to a peer with new opportunities for attack.
Internet Engineering Task Force (IETF) S. Hartman Request for Comments: 7029 M. Wasserman Category: Informational Painless Security ISSN: 2070-1721 D. Zhang Huawei October 2013
Extensible Authentication Protocol (EAP) Mutual Cryptographic Binding
As the Extensible Authentication Protocol (EAP) evolves, EAP peers rely increasingly on information received from the EAP server. EAP extensions such as channel binding or network posture information are often carried in tunnel methods; peers are likely to rely on this information. Cryptographic binding is a facility described in RFC 3748 that protects tunnel methods against man-in-the-middle attacks. However, cryptographic binding focuses on protecting the server rather than the peer. This memo explores attacks possible when the peer is not protected from man-in-the-middle attacks and recommends cryptographic binding based on an Extended Master Session Key, a new form of cryptographic binding that protects both peer and server along with other mitigations.
Status of This Memo
This document is not an Internet Standards Track specification; it is published for informational purposes.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Not all documents approved by the IESG are a candidate for any level of Internet Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7029.
Hartman, et al. Informational [Page 1]
RFC 7029 Mutual Crypto Binding October 2013
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