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Re: [TLS] Encrypting ALPN and other unused extensions

Peter Gutmann <pgut001@cs.auckland.ac.nz> Sat, 26 April 2014 18:30 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: "<tls@ietf.org>" <tls@ietf.org>
Thread-Topic: [TLS] Encrypting ALPN and other unused extensions
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Date: Sat, 26 Apr 2014 18:30:09 +0000
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Subject: Re: [TLS] Encrypting ALPN and other unused extensions
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Paul Hoffman <paul.hoffman@vpnc.org> writes:

>RFC 6125 says plenty about naming with URIs, as does the base PKIX spec;
>neither specifies any operational way to authenticate past the host name.

While they don't specify how to do it, they also don't say that you can't just
say host:port in the standard manner.  You'd need to update software to handle
this, but at least it's a fail-closed mechanism, if the implementation doesn't
understand host:port then it won't connect.

(Well, it shouldn't connect, given the hit-and-miss nature of hostname
checking it may connect no matter what the string is).

Peter.

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