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Manage TPM commands

This article for the IT professional describes how to manage which Trusted Platform Module (TPM) commands are available to domain users and to local users.

After a computer user takes ownership of the TPM, the TPM owner can limit which TPM commands can be run by creating a list of blocked TPM commands. The list can be created and applied to all computers in a domain by using Group Policy, or a list can be created for individual computers by using the TPM MMC. Because some hardware vendors might provide additional commands or the Trusted Computing Group may decide to add commands in the future, the TPM MMC also supports the ability to block new commands.

The following procedures describe how to manage the TPM command lists. You must be a member of the local Administrators group.

Block TPM commands by using the Local Group Policy Editor

  1. Open the Local Group Policy Editor (gpedit.msc). If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then select Yes.

    Note

    Administrators with appropriate rights in a domain can configure a Group Policy Object (GPO) that can be applied through Active Directory Domain Services (AD DS).

  2. In the console tree, under Computer Configuration, expand Administrative Templates, and then expand System.

  3. Under System, select Trusted Platform Module Services.

  4. In the details pane, double-click Configure the list of blocked TPM commands.

  5. Select Enabled, and then select Show.

  6. For each command that you want to block, select Add, enter the command number, and then select OK.

    Note

    For a list of commands, see links in the TPM Specification.

  7. After you have added numbers for each command that you want to block, select OK twice.

  8. Close the Local Group Policy Editor.

Block or allow TPM commands by using the TPM MMC

  1. Open the TPM MMC (tpm.msc). If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then select Yes.

  2. In the console tree, select Command Management. A list of TPM commands is displayed.

  3. In the list, select a command that you want to block or allow.

  4. Under Actions, select Block Selected Command or Allow Selected Command as needed. If Allow Selected Command is unavailable, that command is currently blocked by Group Policy.

Block new commands

  1. Open the TPM MMC (tpm.msc). If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then select Yes.

  2. In the console tree, select Command Management. A list of TPM commands is displayed.

  3. In the Action pane, select Block New Command. The Block New Command dialog box is displayed.

  4. In the Command Number text box, type the number of the new command that you want to block, and then select OK. The command number you entered is added to the blocked list.

Use the TPM cmdlets

You can manage the TPM using Windows PowerShell. For details, see TrustedPlatformModule PowerShell cmdlets.