2023-10-24 17:14:39 +00:00
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#mount /boot in read-only by default
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mount /boot
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#verify detached signature of /boot content
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find /boot/kexec*.txt | gpg --verify /boot/kexec.sig -
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2019-01-26 17:20:31 +00:00
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#remove invalid kexec_* signed files
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mount /dev/sda1 /boot && mount -o remount,rw /boot && rm /boot/kexec* && mount -o remount,ro /boot
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#Generate keys from GPG smartcard:
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mount-usb && gpg --home=/.gnupg/ --card-edit
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#Copy generated public key, private_subkey, trustdb and artifacts to external media for backup:
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mount -o remount,rw /media && mkdir -p /media/gpg_keys; gpg --export-secret-keys --armor email@address.com > /media/gpg_keys/private.key && gpg --export --armor email@address.com > /media/gpg_keys/public.key && gpg --export-ownertrust > /media/gpg_keys/otrust.txt && cp -r ./.gnupg/* /media/gpg_keys/ 2> /dev/null
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#Insert public key and trustdb export into reproducible rom:
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cbfs -o /media/coreboot.rom -a "heads/initrd/.gnupg/keys/public.key" -f /media/gpg_keys/public.key && cbfs -o /media/coreboot.rom -a "heads/initrd/.gnupg/keys/otrust.txt" -f /media/gpg_keys/otrust.txt
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#Flush changes to external media:
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mount -o,remount ro /media
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#Flash modified reproducible rom with inserted public key and trustdb export from precedent step. Flushes actual rom's keys (-c: clean):
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flash.sh -c /media/coreboot.rom
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#Attest integrity of firmware as it is
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seal-totp
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#Verify Intel ME state:
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2016-09-26 17:51:10 +00:00
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cbmem --console | grep '^ME'
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cbmem --console | less
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