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fwupd/plugins/uefi-dbx
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Mario Limonciello 661990ed98 Convert build system to use meson tristate features 
tristate features will automatically disable if dependencies marked
as required are missing.

Packagers can manually override using `auto_features`.

Link: https://mesonbuild.com/Build-options.html#features
2022-02-28 08:34:48 -06:00
..
fuzzing uefi-dbx: Add a plugin that analyses the UEFI dbx variable 2020-05-07 16:59:36 +01:00
dbxtool.1 trivial: fix man page sections 2022-01-04 14:17:43 -06:00
fu-dbxtool.c Do not use gettext before calling setlocale 2022-02-09 16:56:47 +00:00
fu-efi-image.c trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-efi-image.h trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-plugin-uefi-dbx.c Speed up the daemon startup by ~2% by doing dlsym much less 2021-11-09 12:02:07 +00:00
fu-self-test.c trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-uefi-dbx-common.c trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-uefi-dbx-common.h trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
fu-uefi-dbx-device.c Add a flag to indicate the device is signed or unsigned 2022-02-22 19:12:06 +00:00
fu-uefi-dbx-device.h trivial: reformat the whole tree to match new format 2021-08-24 11:18:40 -05:00
meson.build Convert build system to use meson tristate features 2022-02-28 08:34:48 -06:00
README.md trivial: update markdown for pre-commit style 2021-07-18 14:42:47 -05:00

README.md

UEFI dbx

Introduction

Updating the UEFI revocation database prevents starting EFI binaries with known security issues, and is typically no longer done from a firmware update due to the risk of the machine being "bricked" if the bootloader is not updated first.

This plugin also checks if the UEFI dbx contains all the most recent revoked checksums. The result will be stored in an security attribute for HSI.

Firmware Format

The daemon will decompress the cabinet archive and extract a firmware blob in EFI_SIGNATURE_LIST format.

See https://www.uefi.org/sites/default/files/resources/UEFI%20Spec%202_6.pdf for details.

This plugin supports the following protocol ID:

  • org.uefi.dbx

GUID Generation

These devices use the GUID constructed of the uppercase SHA256 of the X509 certificates found in the system KEK and optionally the EFI architecture. e.g.

  • UEFI\CRT_{sha256}
  • UEFI\CRT_{sha256}&ARCH_{arch}

...where arch is typically one of IA32, X64, ARM or AA64

Update Behavior

The firmware is deployed when the machine is in normal runtime mode, but it is only activated when the system is restarted.

Vendor ID Security

The vendor ID is hardcoded to UEFI:Microsoft for all devices.

External Interface Access

This plugin requires:

  • read/write access to /sys/firmware/efi/efivars