linux-kernel - Re: [PATCH 1/4] keys: Introduce tsm keys

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 4 Aug 2023 10:07:39 -0700
From:   Dionna Amalie Glaze <dionnaglaze@...gle.com>
To:     James Bottomley <James.Bottomley@...senpartnership.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Peter Gonda <pgonda@...gle.com>, dhowells@...hat.com,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Samuel Ortiz <sameo@...osinc.com>, peterz@...radead.org,
        linux-coco@...ts.linux.dev, keyrings@...r.kernel.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] keys: Introduce tsm keys

>
> Just on this one, it's already specified in the latest SVSM doc:
>
> https://lore.kernel.org/linux-coco/a2f31400-9e1c-c12a-ad7f-ea0265a12068@amd.com/
>
> The Service Attestation Data on page 36-37.  It says TPMT_PUBLIC of the
> EK.  However, what it doesn't say is *which* EK.  I already sent in a
> comment saying it should be the TCG template for the P-256 curve EK.
>
> So asking the SVSM to give you the attestation report for the VTPM
> service binds the EK of the vTPM.
>

Yes, thanks. It sounds like you have to ask the SVSM to certify the EK
separately from asking the TPM for a quote. We can't rely entirely on
the TPM API and avoid a sev-guest device for talking to the SVSM. Or
are you saying the SVSM attestation report will get encoded in the
x.509 EK certificate that the TPM API returns, such as the report is
in a cert extension? I'm less clear on how TPM software would
interpret the Issuer of that cert.

> James
>


-- 
-Dionna Glaze, PhD (she/her)