Re: [dhcwg] Security review of draft-ietf-dhc-sedhcpv6-08.txt

神明達哉 <jinmei@wide.ad.jp> Mon, 27 July 2015 18:25 UTC

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Cc: "dhcwg@ietf.org" <dhcwg@ietf.org>, Russ Housley <housley@vigilsec.com>
Subject: Re: [dhcwg] Security review of draft-ietf-dhc-sedhcpv6-08.txt
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>      Russ Housley has reviewed the sedhcp draft from a security
> perspective.  His comments are below.  I have included him on the
> distribution so that he can engage in the discussion.

> ------

> Section 4 says that TOFU is an option.  I like leap-of-faith mechanisms
> in some situations, but I am not convinced that this is one of them.

Specifically what are you referring to by "this"?  The paragraph
beginning with "TOFU can also be used" and talking about hijack
prevention?

> One possible way forward is to look at the certificates that are being
> discussed in 802.1 for MACsec.  They bind a MAC address to a public key.
>  Can the 802.1 certificate be used here too?

I'm not familiar with MACsec, but I'm afraid the answer is "no", since
a client and a server may not be in the same layer 2 network (they can
be off-link and communicate via a relay agent).

--
JINMEI, Tatuya