Re: [Trusted-computing] TPM measurement during a PXEboot

[Li, David]

Joe,

This is interesting! My server has TPM,  5520 chipset and 5650 processors which are
required to support TXT. I am also using RHEL6 which may have tboot code. The only
variable is BIOS. My BIOS supports basic SRTM (PCR0-7 measurements) but probably is not
TXT-enabled. So the questions are:

1.       Can I still use TXT to ensure trusted boot of my Linux kernel and apps?

2.       Can TXT work in a PXEboot environment?
Thanks.

---
David Li
Cloudshield Technologies
SAIC

From: Cihula, Joseph [mailto:[e-mail]]
Sent: Tuesday, September 27, 2011 10:56 AM
To: George Wilson; Li, David
Cc: trusted-computing(a)lists.fedorahosted.org; Lee Wilson
Subject: RE: [Trusted-computing] TPM measurement during a PXEboot

For those who are not TCG members or who want to work with existing systems, you can find
out about Intel’s D-RTM implementation, Intel® Trusted Execution Technology, at
http://www.intel.com/content/www/us/en/architecture-and-technology/truste...

Joe

From: George Wilson
[mailto:[e-mail]]<mailto:[mailto:[e-mail]]>
Sent: Tuesday, September 27, 2011 9:47 AM
To: Li, David
Cc: Cihula, Joseph;
[e-mail]<mailto:[e-mail]>;
Lee Wilson
Subject: Re: [Trusted-computing] TPM measurement during a PXEboot


Hi David,

It is being worked on now. If you are a TCG member, you should be able to get access to a
draft. Adding Lee Wilson on copy as he chairs that WG.

Regards,
George Wilson
IBM Linux Technology Center
Security Architect & Team Lead
512-286-9271

[cid:image001.gif@01CC7D0A.E4E6FCF0]"Li, David" ---09/27/2011 11:19:17
AM---"Li, David" <[e-mail]<mailto:[e-mail]>>
"Li, David" <[e-mail]<mailto:[e-mail]>>
Sent by:
[e-mail]<mailto:[e-mail]>

09/27/2011 10:21 AM


To


"Cihula, Joseph"
<[e-mail]<mailto:[e-mail]>>,
"[e-mail]<mailto:[e-mail]>"
<[e-mail]<mailto:[e-mail]>>


cc




Subject


Re: [Trusted-computing] TPM measurement during a PXEboot








I searched TCG and it’s not obvious to me. Is there a TCG standard on DRTM?

---
David Li
Cloudshield Technologies
SAIC
Tel. [phone] (work)
650-224-3891 (cell)

From: Cihula, Joseph [mailto:[e-mail]]
Sent: Tuesday, September 27, 2011 12:00 AM
To: Li, David;
[e-mail]<mailto:[e-mail]>
Subject: RE: TPM measurement during a PXEboot

You could try a dynamic root of trust, which can be initiated from a PXE-booted image and
won’t depend on whether the PXE ROM measures it or not.

Joe

From:
[e-mail]<mailto:[e-mail]>
[mailto:[e-mail]]<mailto:%5Bmailto:[e-mail]%5D>
On Behalf Of Li, David
Sent: Monday, September 26, 2011 5:08 PM
To:
[e-mail]<mailto:[e-mail]>
Subject: [Trusted-computing] TPM measurement during a PXEboot

I know the spec (TCG EFI Platform Spec v1.2) doesn’t explicitly mention what to do in a
PXEBoot regarding kernel image TPM measurement. Sounds like this should fall into the
general category of kernel measurement into PCR4 and 5. Now in my case, this is a gray
area in reality. Typically PXEboot is handed by the PXE ROM in a NIC card and not by the
motherboard BIOS. What if the main BIOS does its job but has to stop at the PXE ROM while
the PXE ROM doesn’t measure the loader and kernel image at all? In other words, if my
chain of trust stops (or breaks) at the PXE ROM, is there any other way to solve this
problem?

Thanks.

---
David Li
Cloudshield Technologies
SAIC
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