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Re: [TLS] Protocol Action: 'IANA Registry Updates for Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)' to Proposed Standard (draft-ietf-tls-iana-registry-updates-05.txt)

Peter Gutmann <pgut001@cs.auckland.ac.nz> Fri, 01 June 2018 02:06 UTC

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From: Peter Gutmann <pgut001@cs.auckland.ac.nz>
To: David Benjamin <davidben@chromium.org>, Joseph Salowey <joe@salowey.net>
CC: Adam Langley <agl@imperialviolet.org>, tls-chairs <tls-chairs@ietf.org>, "<tls@ietf.org>" <tls@ietf.org>
Thread-Topic: [TLS] Protocol Action: 'IANA Registry Updates for Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)' to Proposed Standard (draft-ietf-tls-iana-registry-updates-05.txt)
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Date: Fri, 01 Jun 2018 02:05:50 +0000
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Subject: Re: [TLS] Protocol Action: 'IANA Registry Updates for Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)' to Proposed Standard (draft-ietf-tls-iana-registry-updates-05.txt)
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​David Benjamin <davidben@chromium.org> writes:

>I probed a bunch of servers yesterday and found evidence of yet another
>collision at 26! It's possible these are TLS-LTS implementations, but a lot
>of them additionally only support RSA decryption ciphers, which makes this
>seem unlikely. 

Another reason why it should be unlikely (emphasis on "should") is that the
use is in SCADA/embedded, so not anything that should be visible on the public
internet.

Having said that, someone sent me a link to a Shodan scan earlier today with
over a thousand devices that definitely shouldn't be on the Internet, so who
knows what's being put online there.

>These servers do not appear to do anything with the extension, as far as I
>could tell, including even echoing it back, but they  send decode_error if
>the extension includes a non-empty body.

Hmm, that does sounds like -LTS, since it has an empty body... no idea whose
implementation that would be though.

Peter.

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