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Message-ID: <20230214210811.448b5ec4@kernel.org>
Date: Tue, 14 Feb 2023 21:08:11 -0800
From: Jakub Kicinski <kuba@...nel.org>
To: Sabrina Dubroca <sd@...asysnail.net>
Cc: netdev@...r.kernel.org, Vadim Fedorenko <vfedorenko@...ek.ru>,
Frantisek Krenzelok <fkrenzel@...hat.com>,
Kuniyuki Iwashima <kuniyu@...zon.com>,
Apoorv Kothari <apoorvko@...zon.com>,
Boris Pismenny <borisp@...dia.com>,
John Fastabend <john.fastabend@...il.com>,
Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
Gal Pressman <gal@...dia.com>,
Marcel Holtmann <marcel@...tmann.org>
Subject: Re: [PATCH net-next v2 0/5] tls: implement key updates for TLS1.3
On Tue, 14 Feb 2023 12:17:37 +0100 Sabrina Dubroca wrote:
> Changes in v2
> use reverse xmas tree ordering in tls_set_sw_offload and
> do_tls_setsockopt_conf
> turn the alt_crypto_info into an else if
> selftests: add rekey_fail test
>
> Vadim suggested simplifying tls_set_sw_offload by copying the new
> crypto_info in the context in do_tls_setsockopt_conf, and then
> detecting the rekey in tls_set_sw_offload based on whether the iv was
> already set, but I don't think we can have a common error path
> (otherwise we'd free the aead etc on rekey failure). I decided instead
> to reorganize tls_set_sw_offload so that the context is unmodified
> until we know the rekey cannot fail. Some fields will be touched
> during the rekey, but they will be set to the same value they had
> before the rekey (prot->rec_seq_size, etc).
>
> Apoorv suggested to name the struct tls_crypto_info_keys "tls13"
> rather than "tls12". Since we're using the same crypto_info data for
> TLS1.3 as for 1.2, even if the tests only run for TLS1.3, I'd rather
> keep the "tls12" name, in case we end up adding a
> "tls13_crypto_info_aes_gcm_128" type in the future.
>
> Kuniyuki and Apoorv also suggested preventing rekeys on RX when we
> haven't received a matching KeyUpdate message, but I'd rather let
> userspace handle this and have a symmetric API between TX and RX on
> the kernel side. It's a bit of a foot-gun, but we can't really stop a
> broken userspace from rolling back the rec_seq on an existing
> crypto_info either, and that seems like a worse possible breakage.
And how will we handle re-keying in offload?
> include/net/tls.h | 4 +
> net/tls/tls.h | 3 +-
> net/tls/tls_device.c | 2 +-
> net/tls/tls_main.c | 37 +++-
> net/tls/tls_sw.c | 189 +++++++++++++----
> tools/testing/selftests/net/tls.c | 336 +++++++++++++++++++++++++++++-
Documentation please.
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