Alan DeKok <al...@deployingradius.com>;; wrote:
>This security bug was completely missed in RFC 5216. This new draft should
>rectify that error.
>
>i.e. using an NAI of "example.org" in the first session, and "example.com" in
>the second session.
>
>Not only is this entirely permitted by the current spec, it's not even
>discussed as an issue. And it means that the protocol is open to a large
>number of time of use, time of check" security bugs which could cause serious
>breaches of networks.
I think Section 2.2 of RFC 5216 do discuss this issue, but it does not
explicitly mention resumption. The text is also too soft.
----------------
2.2. Identity Verification
As noted in Section 5.1 of [RFC3748]:
It is RECOMMENDED that the Identity Response be used primarily for
routing purposes and selecting which EAP method to use. EAP
Methods SHOULD include a method-specific mechanism for obtaining
the identity, so that they do not have to rely on the Identity
Response.
As part of the TLS negotiation, the server presents a certificate to
the peer, and if mutual authentication is requested, the peer
presents a certificate to the server. EAP-TLS therefore provides a
mechanism for determining both the peer identity (Peer-Id in
[KEYFRAME]) and server identity (Server-Id in [KEYFRAME]). For
details, see Section 5.2.
Since the identity presented in the EAP-Response/Identity need not be
related to the identity presented in the peer certificate, EAP-TLS
implementations SHOULD NOT require that they be identical. However,
if they are not identical, the identity presented in the EAP-
Response/Identity is unauthenticated information, and SHOULD NOT be
used for access control or accounting purposes.
----------------
Suggestion to add to Section 2.2 of EAP-TLS 1.3
"The identity presented in the EAP-Response/Identity is unauthenticated
information, and SHALL NOT be used for access control or accounting purposes.
Note that this also applies to resumption."
/John
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