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This was requested, though I think an issue was never filed. If people are supposed to invoke it, even for testing, then it's reasonable to make it "public".
42 lines
1.8 KiB
Bash
42 lines
1.8 KiB
Bash
# SPDX-License-Identifier: MIT-0
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# Enroll the TPM2 security chip in the LUKS2 volume, and bind it to PCR 7
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# only. Replace /dev/sdXn by the partition to use (e.g. /dev/sda1).
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sudo systemd-cryptenroll --tpm2-device=auto --tpm2-pcrs=7 /dev/sdXn
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# Test: Let's run systemd-cryptsetup to test if this worked.
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sudo systemd-cryptsetup attach mytest /dev/sdXn - tpm2-device=auto
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# If that worked, let's now add the same line persistently to /etc/crypttab,
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# for the future. We don't want to use the (unstable) /dev/sdX name, so let's
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# figure out a stable link:
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udevadm info -q -r symlink /dev/sdXn
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# Now add the line using the by-uuid symlink to /etc/crypttab:
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sudo bash -c 'echo "mytest /dev/disk/by-uuid/... - tpm2-device=auto" >>/etc/crypttab'
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# And now let's check that automatic unlocking works:
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sudo systemd-cryptsetup detach mytest
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sudo systemctl daemon-reload
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sudo systemctl start cryptsetup.target
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systemctl is-active systemd-cryptsetup@mytest.service
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# Once we have the device which will be unlocked automatically, we can use it.
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# Usually we would create a file system and add it to /etc/fstab:
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sudo mkfs.ext4 /dev/mapper/mytest
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# This prints a 'Filesystem UUID', which we can use as a stable name:
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sudo bash -c 'echo "/dev/disk/by-uuid/... /var/mytest ext4 defaults,x-systemd.mkdir 0 2" >>/etc/fstab'
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# And now let's check that the mounting works:
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sudo systemctl daemon-reload
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sudo systemctl start /var/mytest
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systemctl status /var/mytest
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# Depending on your distribution and encryption setup, you may need to manually
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# regenerate your initramfs to be able to use a TPM2 security chip to unlock
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# the partition during early boot.
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# More information at https://unix.stackexchange.com/a/705809.
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# On Fedora based systems:
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sudo dracut --force
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# On Debian based systems:
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sudo update-initramfs -u
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