Fix This Broken Encrypted Linux Block Device

15 minutes
  • 4 Learning Objectives

About this Hands-on Lab

In this activity you will resolve an issue that prevents a LUKS container from being opened successfully.

You are working as a System Administrator and tasked with opening and mounting a corrupted LUKS container. Currently the device is not recognized as a LUKS container as shown by the isLuks command:
“`
# cryptsetup -v isLuks /dev/loop0
Command failed with code -1 (wrong or missing parameters).
“`
You will need to login to the remote system running CentOS Linux 7.7 and resolve the issue.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Repair the Corruption
sudo cryptsetup luksHeaderRestore --header-backup-file /root/header.backup /dev/loop0
Confirm the LUKS Container Is Intact
sudo cryptsetup -v isLuks /dev/loop0
Open the LUKS container Using the Keyfile in /root/lukskey
sudo cryptsetup luksOpen /dev/loop0 encvol --key-file /root/lukskey
Mount the Filesystem and Confirm the Data Is Readable

Mount the filesystem:

sudo mount /dev/mapper/encvol /mnt

Read data:

cat /mnt/secret

Additional Resources

You are working as a System Administrator and tasked with opening and mounting a corrupted LUKS container. Currently the device is not recognized as a LUKS container as shown by the isLuks command:

  # cryptsetup -v isLuks /dev/loop0
  Command failed with code -1 (wrong or missing parameters).

You will need to login to the remote system running CentOS Linux 7.7 and complete the follow tasks to successfully open and mount the encrypted container:

  1. Repair the corruption.
  2. Confirm the LUKS container is intact.
  3. Open the LUKS container using the keyfile in /root/lukskey.
  4. Mount the filesystem and confirm the data is readable.

HINT: A recent backup of the LUKS header is available in /root/header.backup.

What are Hands-on Labs

Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.

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