Summary
Secure Boot is a verification mechanism that requires each binary loaded at boot to be validated against known keys located in firmware, or trusted specific binaries identified via cryptographic hashing.
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To check the status of Secure Boot on Ubuntu, users need to install the shim binary, grub, and MokManager binary, and use the shim/MokManager command to enroll keys, remove trusted keys, enroll binary hashes, and toggle Secure Boot validation at the shim level.
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The easiest way to check if Secure Boot is enabled is to check if the folder /sys/firmware/efi exists.
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Additionally, UEFI Secure Boot requires DKMS modules to be configured to work with it, and users can sign modules themselves by using the command kmodsign or mokutil --import.
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Summary
UEFI Secure Boot is a verification mechanism for ensuring that code launched by firmware is trusted. It requires each binary loaded at boot to be validated against known keys, located in firmware, that denote trusted vendors and sources for the binaries, or trusted specific binaries that can be identified via cryptographic hashing. Testing UEFI Secure Boot on Ubuntu requires users to install the shim binary, grub, and MokManager binary, and to use the shim/MokManager command to enroll keys, remove trusted keys, enroll binary hashes, and toggle Secure Boot validation at the shim level.
UEFI/SecureBoot - Ubuntu Wiki
ubuntu.com
Summary
The easiest way is to check if the folder /sys/firmware/efi exists.
The folder /sys/firmware/efi does not appear if the Linux computer was booted using traditional BIOS.
The mokutil command is used to manage Machine Owner Keys (MOK).
Secure Boot on Linux systems - Kvaser
kvaser.com
Summary
UEFI Secure Boot requires DKMS modules to be configured to work with it, and there are several methods to do this. These include installing the DKMS package, disabling Secure Boot in shim-signed, or disabling Secure Boot from the BIOS. Additionally, users can sign modules themselves by using the command kmodsign or mokutil --import.
UEFI/SecureBoot/DKMS - Ubuntu Wiki
ubuntu.com
\ --output /boot/efi/EFI/ubuntu/grubx64.efi \ /usr/lib/grub/x86_64-efi-signed/grubx64.efi.signed Try to 'boot from file' shimx64.efi (succeed if sb disabled, ...
UEFI/SecureBoot/Testing - Ubuntu Wiki
ubuntu.com
If you want to test Secure Boot in a virtual machine without having to deal with an actual machine, see SecureBoot/VirtualMachine .
SecureBoot - Debian Wiki
debian.org
