Prepare
First you need to enable Secure Boot and TPM to enable Clevis-TPM2. You need to check those settings in your BIOS settings.
For Secure Boot, if you are using Ubuntu or Fedora, you can simply factory reset it and trust 3rd party certs. But if you are using other OS, you may need to manually configure your system to trust third-party certificates for Secure Boot. The exact steps required will depend on your specific operating system and hardware configuration.
Generally, you will need to generate a new key pair and certificate for your system, sign your boot loader and kernel with the new key, and then enroll the key in your system's Secure Boot database.
The specific steps required will vary depending on your system and the version of Secure Boot that it supports. You may need to consult your system's documentation or seek assistance from a knowledgeable technical expert to properly configure Secure Boot on your system.
Install
To automatically unlock a LUKS2 encrypted system partition using Clevis, you need to install the clevis and clevis-tpm2 packages. Use the following command to install them:
sudo dnf install clevis clevis-luks clevis-dracut clevis-udisks2 clevis-systemd
Enable
Use fdisk -l and lsblk to locate your system partition.
Once installed, you need to bind the TPM2 key to Clevis using the following command:
sudo clevis luks bind -d /dev/sdaX tpm2 '{"pcr_ids":"0,1,2,3,4,5,6,7"}'
Replace /dev/sdaX with your system partition. This command creates a key on the TPM2 chip and binds it to the LUKS2 encrypted system partition.
You will be prompted to enter your passkey.
Finally, update the system files to use Clevis to automatically unlock the system partition using the following command:
sudo dracut -f
This updates the initramfs file to include Clevis and configures the system to automatically unlock the LUKS2 encrypted system partition using Clevis. Note that this may take some time depending on your system configuration and hardware performance.
After completing these steps, your system partition will unlock automatically without the need to enter a password or key manually.
The blog post provides a detailed step-by-step guide on how to automatically unlock a LUKS2 encrypted system partition using Clevis and TPM2. The author's clear and concise instructions make the process easy to follow, which is particularly beneficial for those who might be new to this topic.
The core concept of the blog is to enhance system security by automating the unlocking of an encrypted system partition. This is an important and relevant topic in today's digital era where data security is paramount. The author does a commendable job of explaining the steps to achieve this with Clevis and TPM2.
One of the most notable aspects of the blog is the author's use of clear and concise language. The instructions are well-structured and easy to follow, which is crucial for technical guides like this one.
However, the blog could benefit from a brief introduction to the topic. While the technical instructions are clear, the author does not provide context or explanation about why a reader might want to automatically unlock a LUKS2 encrypted system partition, or what the benefits of doing so might be. This could leave readers, particularly those less familiar with the topic, feeling a bit lost.
Additionally, the author could have included a troubleshooting section or some common errors that users might encounter during the process. This would be helpful for readers who might run into problems.
In conclusion, the blog post is a great guide for those wanting to automate the unlocking of a LUKS2 encrypted system partition using Clevis and TPM2. With a bit more context and troubleshooting tips, it could be an even more valuable resource.