# LUKS-Encrypted Disk Images on Linux

## NOTE: This will not work on an LXC unprivileged container!

To make it work inside an LXC: You’d need to modify your container config (as root on the host):
```
lxc.apparmor.profile = unconfined
lxc.cap.drop =
lxc.cgroup.devices.allow = b 7:* rwm     # /dev/loop*
lxc.cgroup.devices.allow = c 10:237 rwm  # /dev/mapper/control
lxc.mount.auto = proc:rw sys:rw
lxc.include = /usr/share/lxc/config/common.conf
```

And run the container as privileged (security.privileged = true).

⚠️ Security warning: privileged LXC containers with these capabilities are essentially “mini-VMs” with host-level power. Not recommended on multi-tenant systems.


## Using your package manager: (apt, etc...) install the following:
## Requires: cryptsetup, losetup, mount, umount, findmnt, blkid
## Optional: VBoxManage (VirtualBox), virsh (libvirt)

## Quick Starts
```
1) Create & mount a new 4 GB encrypted image:
sudo ./luks-img.sh create --file mydisk.img --size 4G

2) Open & mount an existing image:
sudo ./luks-img.sh open --file mydisk.img --mount /mnt/luks

3) Close (unmount, close mapper, detach loop):
sudo ./luks-img.sh close --file mydisk.img

4) Backup the LUKS header:
sudo ./luks-img.sh header-backup --file mydisk.img --out mydisk.header

*) Add a new key using an existing keyfile:
sudo ./luks-img.sh add-key --file mydisk.img --keyfile /path/newkey --existing-keyfile /path/oldkey
```

### If you want to add the image file to a VM:

## Virtual Box:
```
sudo ./luks-img.sh launch-vbox --file mydisk.img --vm "Ubuntu VM" --start
sudo ./luks-img.sh detach-vbox --vm "Ubuntu VM"
```
## libvirt/QEMU VM:
```
sudo ./luks-img.sh attach-virt --file mydisk.img --vm myvm --target vdb --persistent
sudo ./luks-img.sh detach-virt --vm myvm --target vdb --persistent
```