Hi Jiewen,
Thanks for your reply. I'll try to describe the 2 use cases shortly:
1 - Firmware upgrade:
platformPolicy authorizes firmware upgrade (see Part3, chapter 27.1). That
means OEM/BIOS (owner of platformPolicy) controls whether firmware can be
upgraded or not. OEM/BIOS needs to set a platformPolicy if it wants to (allow
someone to) upgrade firmware. OEM/BIOS can create platformPolicy offline and
set it with TPM2_SetPrimaryPolicy command. Next someone needs to call
TPM2_StartAuthSession to start a TPM_SE_POLICY session and authorize it with
TPM2_Policy* commands according to platformPolicy. Then firmware upgrade can be
done based on the authorized policy session.
You can find more information in Part1, chapter 12.5 and Part3, chapter 27.1.
2 - Delegation:
Knowledge of platformAuth allows to perform the following operations (see
Part1, chapter 13.3) amongst others:
- allocation of TPM NV memory
- PCR configuration
- control of the availability of any key hierarchies
- change of the PPS, SPS, and EPS and reset of associated authorization values
and policy
OEM/BIOS can delegate these rights to other entities (like TPM_RH_OWNER etc.)
by setting a corresponding platformPolicy with TPM2_SetPrimaryPolicy.
About additional missing commands:
>From my point of view TPM2_StartAuthSession and policy commands
>(TPM2_PolicyCommandCode, TPM2_PolicySecret) would also be helpful for use case
>1.
Thank you
Stefan
Part1:
http://www.trustedcomputinggroup.org/files/static_page_files/8C56AE3E-1A4B-B294-D0F43097156A55D8/TPM%20Rev%202.0%20Part%201%20-%20Architecture%2001.16.pdf
Part3:
http://www.trustedcomputinggroup.org/files/static_page_files/8C68ADA8-1A4B-B294-D0FC06D3773F7DAA/TPM%20Rev%202.0%20Part%203%20-%20Commands%2001.16-code.pdf
-----Original Message-----
From: Yao, Jiewen [mailto:jiewen....@intel.com]
Sent: Thursday, November 13, 2014 11:42 PM
To: edk2-devel@lists.sourceforge.net<mailto:edk2-devel@lists.sourceforge.net>
Subject: Re: [edk2] SecurityPkg: TPM2_SetPrimaryPolicy command
Hi Stefan
I think it might OK to add commands to Tpm2CommandLib, as long as there is
valid usage.
Would you please help to describe more on a whole picture on below 2 cases?
E.g. Why and how TPM firmware upgrade use this command in BIOS? Why and how OEM
delegate TPM_RH_PLATFORM role, and for which TPM command, as example?
Do you think TPM2_SetPrimaryPolicy is only missing command, or there are more
needed in above 2 cases? Like TPM2_CreatePrimary?
Thank you
Yao Jiewen
-----Original Message-----
From: stefan.kae...@infineon.com<mailto:stefan.kae...@infineon.com>
[mailto:stefan.kae...@infineon.com]
Sent: Friday, November 14, 2014 12:10 AM
To: edk2-devel@lists.sourceforge.net<mailto:edk2-devel@lists.sourceforge.net>
Subject: [edk2] SecurityPkg: TPM2_SetPrimaryPolicy command
Hello!
Would it be possible to add the command TPM2_SetPrimaryPolicy to
Tpm2CommandLib? The command is required to set platformPolicy and use cases are:
* OEM/BIOS sets platformPolicy to authorize TPM firmware upgrade.
* OEM/BIOS delegates the TPM_RH_PLATFORM role for a specific TPM command.
For further information on the command please refer to chapter 24.3 in
http://www.trustedcomputinggroup.org/files/static_page_files/8C68ADA8-1A4B-B294-D0FC06D3773F7DAA/TPM%20Rev%202.0%20Part%203%20-%20Commands%2001.16-code.pdf.
Regards,
Stefan
Stefan Käser
Infineon Technologies AG
CCS TI SWT SW PC
Staff Engineer Software Development
Phone: +49 (0)821 25851 65
Fax: +49 (0)821 25851 40
stefan.kae...@infineon.com<mailto:stefan.kae...@infineon.com<mailto:stefan.kae...@infineon.com%3cmailto:stefan.kae...@infineon.com>>
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