Dell EMC PowerEdge M640 Installation and Service Manual

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System Security Settings details

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The System Security Settings screen details are explained as follows:
Option
Description
Intel(R) AES-NI
Improves the speed of applications by performing encryption and decryption by using the Advanced Encryption Standard Instruction Set (AES-NI). This option is set to Enabled by default.
System Password
Sets the system password. This option is set to Enabled by default and is read-only if the password jumper is not installed in the system.
Setup Password
Sets the setup password. This option is read-only if the password jumper is not installed in the system.
Password Status
Locks the system password. This option is set to Unlocked by default.
TPM Security
  • NOTE: The TPM menu is available only when the TPM module is installed.
Enables you to control the reporting mode of the TPM. The TPM Security option is set to Off by default. You can only modify the TPM Status TPM Activation , and the Intel TXT fields if the TPM Status field is set to either On with Pre-boot Measurements or On without Pre-boot Measurements.
TPM Information
Changes the operational state of the TPM. This option is set to No Change by default.
TPM Status
Specifies the TPM status.
TPM Command
Controls the Trusted Platform Module (TPM). When set to None, no command is sent to the TPM. When set to Activate, the TPM is enabled and activated. When set to Deactivate, the TPM is disabled and deactivated. When set to Clear, all the contents of the TPM are cleared. This option is set to None by default.
  • CAUTION: Clearing the TPM results in the loss of all keys in the TPM. The loss of TPM keys may affect booting to the operating system.
This field is read-only when TPM Security is set to Off. The action requires an additional reboot before it can take effect.
Intel(R) TXT
Enables or disables the Intel Trusted Execution Technology (TXT) option. To enable the Intel TXT option, virtualization technology and TPM Security must be enabled with Pre-boot measurements. This option is set to Off by default.
Power Button
Enables or disables the power button on the front of the system. This option is set to Enabled by default.
AC Power Recovery
Sets how the system behaves after AC power is restored to the system. This option is set to Last by default.
UEFI Variable Access
Provides varying degrees of securing UEFI variables. When set to Standard (the default), UEFI variables are accessible in the operating system per the UEFI specification. When set to Controlled, selected UEFI variables are protected in the environment and new UEFI boot entries are forced to be at the end of the current boot order.
In-Band Manageability Interface
When set to Disabled, this setting will hide the Management Engine's (ME), HECI devices, and the system's IPMI devices from the operating system. This prevents the operating system from changing the ME power capping settings, and blocks access to all in-band management tools. All management should be managed through out-of-band. This option is set to Enabled by default.
  • NOTE: BIOS update requires HECI devices to be operational and DUP updates require IPMI interface to be operational. This setting needs to be set to Enabled to avoid updating errors.
Secure Boot
Enables Secure Boot, where the BIOS authenticates each pre-boot image by using the certificates in the Secure Boot Policy. Secure Boot is set to Disabled by default.
Secure Boot Policy
When Secure Boot policy is set to Standard, the BIOS uses the system manufacturer’s key and certificates to authenticate pre-boot images. When Secure Boot policy is set to Custom, the BIOS uses the user-defined key and certificates. Secure Boot policy is set to Standard by default.
Secure Boot Mode
Configures how the BIOS uses the Secure Boot Policy Objects (PK, KEK, db, dbx).

If the current mode is set to Deployed Mode, the available options are User Mode and Deployed Mode. If the current mode is set to User Mode, the available options are User Mode, Audit Mode, and Deployed Mode.

Options
Description
User Mode

In User Mode, PK must be installed, and BIOS performs signature verification on programmatic attempts to update policy objects.

The BIOS allows unauthenticated programmatic transitions between modes.

Audit Mode

In Audit mode, PK is not present. The BIOS does not authenticate programmatic updates to the policy objects, and transitions between modes.

Audit Mode is useful for programmatically determining a working set of policy objects.

BIOS performs signature verification on pre-boot images and logs results in the image Execution Information Table, but executes the images whether they pass or fail verification.

Deployed Mode

Deployed Mode is the most secure mode. In Deployed Mode, PK must be installed and the BIOS performs signature verification on programmatic attempts to update policy objects.

Deployed Mode restricts the programmatic mode transitions.

Secure Boot Policy Summary
Specifies the list of certificates and hashes that secure boot uses to authenticate images.
Secure Boot Custom Policy Settings
Configures the Secure Boot Custom Policy. To enable this option, set the Secure Boot Policy to Custom option.

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