Table 23. System Security details (continued)
Option
Description
3. Direct Memory Access Protection must be enabled.
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.
AC Power Recovery Delay
Sets the time delay for the system to power up after AC power is restored to the
system. This option is set to
Immediate
by default.
User Defined Delay (60 s to 600
s)
Sets the
User Defined Delay
option when the
User Defined
option for
AC Power
Recovery Delay
is selected.
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.
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
.
Table 24. Secure Boot Mode
Options
Descriptions
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.
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.
Audit Mode
In
Audit mode
, PK is not present. The BIOS does not authenticate
programmatic updates to the policy objects, and transitions between
modes. The BIOS performs a signature verification on pre-boot images
and logs the results in the image Execution Information Table, but
executes the images whether they pass or fail verification.
Audit Mode
is useful for programmatic determination of a working set
of policy objects.
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.
18
Pre-operating system management applications
