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Re: [Rats] TPM background for RIV

"Oliver, Ian (Nokia - FI/Espoo)" <ian.oliver@nokia-bell-labs.com> Wed, 26 August 2020 07:07 UTC

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From: "Oliver, Ian (Nokia - FI/Espoo)" <ian.oliver@nokia-bell-labs.com>
To: Michael Richardson <mcr@sandelman.ca>, Ira McDonald <blueroofmusic@gmail.com>, "rats@ietf.org" <rats@ietf.org>
Thread-Topic: [Rats] TPM background for RIV
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Date: Wed, 26 Aug 2020 07:07:08 +0000
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Subject: Re: [Rats] TPM background for RIV
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Doesn't the TPM 2 standard state PCRs 0 through to 23 with two banks being provided SHA1 and SHA256 (at particular handles 0x4......?)

It is the boot specification - at least for x86 - that states PCRs 0-7 are utilised for specific purposes, ie: CRTM, BIOS, configuration, boot loader, LCP and manufacturer defined.

At least on some of our UEFI machines I see 8, 9 and 10 being used.

11 is the default for Linux IMA and 17 and 18 for Intel DRTM measurements

There are restrictions due to locality, so at least on a PC, PCRS 16 and 23 are available to userland modification.

Ian


--

Dr. Ian Oliver

Cybersecurity Research

Distinguished Member of Technical Staff

Nokia Bell Labs

+358 50 483 6237

________________________________
From: Michael Richardson <mcr@sandelman.ca>
Sent: 26 August 2020 01:29
To: Ira McDonald <blueroofmusic@gmail.com>; rats@ietf.org <rats@ietf.org>
Subject: Re: [Rats] TPM background for RIV

Ira McDonald <blueroofmusic@gmail.com> wrote:
    > Small note:  Although you say each TPM has at least 16 PCRs, in fact the
    > TPM 2.0 Mobile Common Profile
    > (2015) only requires the implementation of one SHA-256 bank of 8 PCRs (a
    > SHA-1 bank is prohibited here).
    > That design choice was made to avoid the squabbles over the inconsistent
    > usage of PCR8 through PCR15
    > across various TPM 2.0 profiles.

I just want to understand.
TPM 2 mobile, only requires PCR0-7.  It doesn't forbid PCR8->15 though?
Do devices tend to implement them all?  Or?

So what do the profiles do now?

What is the impact on RIV?

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