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[TLS] Re: 2nd Working Group Last Call for The SSLKEYLOGFILE Formatfor TLS

"Salz, Rich" <rsalz@akamai.com> Thu, 20 February 2025 16:59 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Stephen Farrell <stephen.farrell@cs.tcd.ie>, Alicja Kario <hkario@redhat.com>, "Bellebaum, Thomas" <thomas.bellebaum@aisec.fraunhofer.de>
Thread-Topic: [TLS] Re: 2nd Working Group Last Call for The SSLKEYLOGFILE Formatfor TLS
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Date: Thu, 20 Feb 2025 16:59:05 +0000
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References: <6a27cae41645539b3fa90b5f83a8973c73cdd6a0.camel@aisec.fraunhofer.de> <CA+_8xu1nDDHuqRbh2OvRVkvxPyLcJS==rumo3sxPC56NsWLCMw@mail.gmail.com> <93eb1e78c7348459fc92ff874c7e691baf4a0bf0.camel@aisec.fraunhofer.de> <ee908b7b-da13-4840-b70a-84dd66d4bc1f@redhat.com> <68995b4c-4cd9-4153-9fff-004c3dbdeb01@cs.tcd.ie>
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Subject: [TLS] Re: 2nd Working Group Last Call for The SSLKEYLOGFILE Formatfor TLS
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> While it may not be feasible to notify a user, the threat of
> widely deployed software that supports key exfiltration being
> abused is real, and made worse by us standardising on this
> way of documenting what is to be exfiltrated.

There already is widely deployed software that leaks key information.  OpenSSL has a trace facility, normally compiled out, that reports PKCS#12 passwords[1]. The keylog stuff *is* compiled-out by default. The OpenSSL library also provides a register-callback function that will get private key material and that is always enabled which the OpenSSL project does not consider a security risk[2]. I assume OpenSSL qualifies as widely-deployed. :)

As for us standardizing this information, I do not consider that a threat because it's pretty obvious to anyone reading the TLS RFC. And surely, saying "base64-UTF8" can't be considered part of anyone's threat model.

[1] https://github.com/openssl/openssl/issues/26283
[2] https://github.com/openssl/openssl/pull/26288

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