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Table 71. System Security details (continued)
Option
User Defined Delay (120s to
600s)
UEFI Variable Access
In-Band Manageability Interface
SMM Security Mitigation
Secure Boot
Secure Boot Policy
Secure Boot Mode
Secure Boot Policy Summary
66
Pre-operating system management applications
Description
system creates a random delay for power up. When this option is set to User Defined,
the system delay time is manually to power up.
Sets the User Defined Delay option when the User Defined option for AC Power
Recovery Delay is selected. The actual AC recovery time needs to add iDRAC root of
trust time (around 50 seconds).
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.
When set to Disabled , this setting hides 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.
Enables or disables the UEFI SMM security mitigation protections. It is set to Disabled
by default.
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.
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.
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.
Below are the details of different boot modes available in the Secure Boot Mode
option.
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. BIOS does not authenticate
programmatic update 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.
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.
Specifies the below list of certificates and hashes that secure boot uses to authenticate
images:
Platform Key (PK)
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