From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Dionna Amalie Glaze <dionnaglaze@google.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
Sathyanarayanan Kuppuswamy
<sathyanarayanan.kuppuswamy@linux.intel.com>,
dhowells@redhat.com, Brijesh Singh <brijesh.singh@amd.com>,
Peter Zijlstra <peterz@infradead.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
Borislav Petkov <bp@alien8.de>,
Jarkko Sakkinen <jarkko@kernel.org>,
Samuel Ortiz <sameo@rivosinc.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-coco@lists.linux.dev, keyrings@vger.kernel.org,
x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/4] keys: Introduce a keys frontend for attestation reports
Date: Tue, 08 Aug 2023 17:46:04 -0400 [thread overview]
Message-ID: <3ff1bee6d121ce76fd78217dbe3e5ab2f0134f54.camel@HansenPartnership.com> (raw)
In-Reply-To: <CAAH4kHYLPP5ehLBDkXxJQmnuFTjjRp+1tON5T9HqSxCvD1mSxA@mail.gmail.com>
On Tue, 2023-08-08 at 13:04 -0700, Dionna Amalie Glaze wrote:
> > Trusting the vTPM is a one time thing. Once trust in the TPM is
> > established, you don't need to be worried about replay and you can
> > just use standard TPM primitives for everything onward, even when
> > doing point in time runtime attestation.
> >
>
> It's a one time thing for who?
Well, in TLS-TPM it tends to be a one time thing per endpoint
regardless of number of connections.
> It seems like you're still only looking at the 1. use case and not
> the 2. use case. Every different person establishing a connection
> with the service will need to independently establish trust in the
> TPM.
For an ephemeral TPM, the EK should be guaranteed to be random and
therefore non repeating, so there's not much need for the nonce to add
non-repeatability. So, in theory, the vTPM/EK binding can be published
once and relied on even for multiple different tenant endpoints, sort
of like the EK cert for a physical TPM.
James
next prev parent reply other threads:[~2023-08-08 21:46 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-28 19:30 Dan Williams
2023-07-28 19:30 ` [PATCH 1/4] keys: Introduce tsm keys Dan Williams
2023-07-28 19:40 ` Jarkko Sakkinen
2023-07-31 16:33 ` Peter Gonda
2023-07-31 17:48 ` Dan Williams
2023-07-31 18:14 ` Peter Gonda
2023-07-31 18:41 ` Dan Williams
2023-07-31 19:09 ` Dionna Amalie Glaze
2023-07-31 20:10 ` Dan Williams
2023-08-04 16:34 ` Peter Gonda
2023-08-04 22:24 ` Dan Williams
2023-08-05 5:11 ` Dan Williams
2023-08-01 18:01 ` Jarkko Sakkinen
2023-08-04 2:40 ` Dan Williams
2023-08-04 16:37 ` Dionna Amalie Glaze
2023-08-04 16:46 ` James Bottomley
2023-08-04 17:07 ` Dionna Amalie Glaze
2023-08-04 17:12 ` James Bottomley
2023-07-28 19:31 ` [PATCH 2/4] virt: sevguest: Prep for kernel internal {get, get_ext}_report() Dan Williams
2023-07-28 19:31 ` [PATCH 3/4] mm/slab: Add __free() support for kvfree Dan Williams
2023-07-28 19:31 ` [PATCH 4/4] virt: sevguest: Add TSM key support for SNP_{GET, GET_EXT}_REPORT Dan Williams
2023-07-31 16:45 ` Peter Gonda
2023-07-31 18:05 ` Dan Williams
2023-07-31 18:28 ` Peter Gonda
2023-07-28 19:34 ` [PATCH 0/4] keys: Introduce a keys frontend for attestation reports Jarkko Sakkinen
2023-07-28 19:44 ` Dan Williams
2023-07-31 10:09 ` Jarkko Sakkinen
2023-07-31 17:33 ` Dan Williams
2023-07-31 22:41 ` Huang, Kai
2023-08-01 18:48 ` Jarkko Sakkinen
2023-07-29 18:17 ` James Bottomley
2023-07-30 4:56 ` Dan Williams
2023-07-30 12:59 ` James Bottomley
2023-07-31 17:24 ` Dan Williams
2023-08-01 11:45 ` Huang, Kai
2023-08-01 12:03 ` James Bottomley
2023-08-01 12:30 ` James Bottomley
2023-08-02 0:10 ` Huang, Kai
2023-08-02 12:41 ` James Bottomley
2023-08-02 23:13 ` Huang, Kai
2023-08-04 3:53 ` Dan Williams
2023-08-04 2:22 ` Dan Williams
2023-08-04 16:19 ` Daniel P. Berrangé
2023-08-04 21:49 ` Huang, Kai
2023-08-05 11:05 ` James Bottomley
2023-08-05 2:37 ` Dan Williams
2023-08-05 13:30 ` James Bottomley
2023-08-07 23:33 ` Dan Williams
2023-08-08 14:19 ` James Bottomley
2023-08-08 14:53 ` Peter Gonda
2023-08-08 14:54 ` Sathyanarayanan Kuppuswamy
2023-08-08 15:48 ` Dan Williams
2023-08-08 16:07 ` Dionna Amalie Glaze
2023-08-08 16:43 ` Dan Williams
2023-08-08 17:21 ` Dionna Amalie Glaze
2023-08-08 18:17 ` Dan Williams
2023-08-08 23:32 ` Huang, Kai
2023-08-09 3:27 ` Dan Williams
2023-08-09 16:14 ` Peter Gonda
2023-08-08 18:16 ` James Bottomley
2023-08-08 18:48 ` Dionna Amalie Glaze
2023-08-08 19:37 ` James Bottomley
2023-08-08 20:04 ` Dionna Amalie Glaze
2023-08-08 21:46 ` James Bottomley [this message]
2023-08-08 22:33 ` Dionna Amalie Glaze
2023-08-08 15:14 ` Dan Williams
2023-08-10 14:50 ` Jarkko Sakkinen
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