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Re: [nfsv4] New Version Notification for draft-cel-nfsv4-rpc-tls-01.txt

Chuck Lever <chuck.lever@oracle.com> Tue, 26 March 2019 17:52 UTC

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From: Chuck Lever <chuck.lever@oracle.com>
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Date: Tue, 26 Mar 2019 13:52:07 -0400
Cc: Olga Kornievskaia <aglo@umich.edu>, NFSv4 <nfsv4@ietf.org>
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To: Lars Eggert <lars@eggert.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/nfsv4/ZuiVDXNjqq5BszRGt3TBkoGltrk>
Subject: Re: [nfsv4] New Version Notification for draft-cel-nfsv4-rpc-tls-01.txt
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> On Mar 26, 2019, at 12:35 PM, Lars Eggert <lars@eggert.org> wrote:
> 
> On 2019-3-26, at 17:33, Lars Eggert <lars@eggert.org> wrote:
>> Also note that STARTTLS is somewhat less secure than running TLS directly. See for example Section 6 of RFC3207:
>> 
>>    A man-in-the-middle attack can be launched by deleting the "250
>>    STARTTLS" response from the server.  This would cause the client not
>>    to try to start a TLS session.  Another man-in-the-middle attack is
>>    to allow the server to announce its STARTTLS capability, but to alter
>>    the client's request to start TLS and the server's response.
>> 
>>    ...
> 
> And RFC8314 recommends (for mail) that "implicit TLS" should be used instead of STARTTLS.

Perhaps that is what we should require for RPC on TLS;
that is, "STARTTLS MUST NOT be used"?


--
Chuck Lever

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