Lab
A Cloud Guru

Recover Data from Encrypted File Systems

In this exercise, you will recover an encrypted LUKS partition by using a backup LUKS header file. *This course is not approved or sponsored by Red Hat.*

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Path Info

Level

Advanced

Duration

1h 0m

Published

Apr 04, 2019

Challenge

Unlock the encrypted device.
Review the contents of /etc/crypttab:
```
cat /etc/crypttab
```
Check the mounts with lsbkl :
```
lsblk
```
Review the contents of /etc/fstab:
```
cat /etc/fstab
```
Attempt to mount /luks:
```
mount /luks
```
Look for the unlocked device in /dev/mapper:
```
ll /dev/mapper
```
Attempt to open manually:
```
cryptsetup luksOpen /dev/mapper/vg_1-lv_1 luks-vg_1-lv_1 --key-file /root/passphrase.key
```
View the key slots:
```
cryptsetup luksDump /dev/mapper/vg_1-lv_1
```
No key slots are in use. Locate the header backup in /root/:
```
ll /root/
```
Restore header file:
```
cryptsetup luksHeaderRestore /dev/mapper/vg_1-lv_1 --header-backup-file /root/vg_1-lv_1.header
```
Type uppercase YES.

Attempt to open manually again (using same key and name as /etc/crypttab:
```
cryptsetup luksOpen /dev/mapper/vg_1-lv_1 luks-vg_1-lv_1 --key-file /root/passphrase.key
```
Verify unlocked device:
```
ll /dev/mapper
```
Challenge

Mount the encrypted device.
Mount the unlocked device:
```
mount /luks/
```
View the files on the device:
```
ll /luks/
```

Author

A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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