Re: [TLS] draft-green-tls-static-dh-in-tls13-01

"Ackermann, Michael" <MAckermann@bcbsm.com> Sat, 08 July 2017 16:14 UTC

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From: "Ackermann, Michael" <MAckermann@bcbsm.com>
To: Yoav Nir <ynir.ietf@gmail.com>, Timothy Jackson <tjackson@mobileiron.com>
CC: Watson Ladd <watsonbladd@gmail.com>, Christian Huitema <huitema@huitema.net>, "tls@ietf.org" <tls@ietf.org>
Thread-Topic: [TLS] draft-green-tls-static-dh-in-tls13-01
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/_7h7Gh5VtyZQ3D4k5vfgqrqacdg>
Subject: Re: [TLS] draft-green-tls-static-dh-in-tls13-01
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+1

From: Yoav Nir [mailto:ynir.ietf@gmail.com]
Sent: Saturday, July 8, 2017 8:36 AM
To: Timothy Jackson <tjackson@mobileiron.com>;
Cc: Ackermann, Michael <MAckermann@bcbsm.com>;; Watson Ladd <watsonbladd@gmail.com>;; Christian Huitema <huitema@huitema.net>;; tls@ietf.org
Subject: Re: [TLS] draft-green-tls-static-dh-in-tls13-01


On 8 Jul 2017, at 6:18, Timothy Jackson <tjackson@mobileiron.com<mailto:tjackson@mobileiron.com>> wrote:

As an earlier poster asked, what advantage does this approach have over TLS-inspecting proxies? Every IPS/IDS/next gen firewall with which I am familiar is able to terminate at TLS connection, inspect/copy/filter, and then encrypt on a new TLS sessions.

For high performance customers, the SSL accelerators can be sandwiched around the filter so all the crypto is done in hardware.

The ways to prevent TLS inspection are cert pinning and client cert auth. If this is only within one's data center, then those features can be disabled if necessary, no?

What use case am I missing that can't be achieved better by other means than static keys?

They would like to store traffic captures encrypted and be able to decrypt them a little later if that is necessary. Storing plaintext is something that auditors (rightfully!) don't like.

They also don't want to install TLS proxies all over the place.  That's a large extra expense for them.

Yoav



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