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# LUKS-Encrypted Disk Images on Linux
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## Using your package manager: (apt, etc...) install the following:
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## Requires: cryptsetup [Exmaple:$ sudo apt install cryptsetup]
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## As well as: losetup, mount, umount, findmnt, blkid
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## Optional: VBoxManage (VirtualBox), virsh (libvirt)
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## 1st Make a symbloic link to your bin path:
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```
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sudo ln -s "$(pwd)/luks-img.sh" /usr/local/bin/
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```
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## Make a folder for images and change into it.
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```
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mkdir -p "$HOME/DiskImages"
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cd "$HOME/DiskImages"
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```
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## Quick Starts
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```
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Have a passphrase ready in mind and then [mydisk.img could be named anything useful like mydocs.img etc...]:
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1) Create & mount a new 4 GB encrypted image:
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sudo luks-img.sh create --file mydisk.img --size 4G
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2) Close (unmount, close mapper, detach loop):
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sudo luks-img.sh close --file mydisk.img
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3) Open & mount an existing image [note its easyer if you name the /mnt/mydisk path something like /mnt/mydocs etc... to match the image name]:
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sudo luks-img.sh open --file mydisk.img --mount /mnt/mydisk
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4) Change DIR perms and change into it.
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sudo chown $USER:$USER /mnt/mydisk
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cd /mnt/mydisk
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NOW copy data to it, and use it...
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5) Backup the LUKS header:
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sudo luks-img.sh header-backup --file mydisk.img --out mydisk.header
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*) Add a new key using an existing keyfile:
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sudo luks-img.sh add-key --file mydisk.img --keyfile /path/newkey --existing-keyfile /path/oldkey
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When Done - Repeat step #2 to CLOSE
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```
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### If you want to add the image file to a VM:
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## Virtual Box:
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```
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sudo luks-img.sh launch-vbox --file mydisk.img --vm "Ubuntu VM" --start
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sudo luks-img.sh detach-vbox --vm "Ubuntu VM"
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```
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## libvirt/QEMU VM:
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```
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sudo luks-img.sh attach-virt --file mydisk.img --vm myvm --target vdb --persistent
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sudo luks-img.sh detach-virt --vm myvm --target vdb --persistent
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```
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## Please NOTE: This will not work on an LXC unprivileged container!
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To make it work inside an LXC: You’d need to modify your container config (as root on the host):
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```
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lxc.apparmor.profile = unconfined
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lxc.cap.drop =
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lxc.cgroup.devices.allow = b 7:* rwm # /dev/loop*
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lxc.cgroup.devices.allow = c 10:237 rwm # /dev/mapper/control
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lxc.mount.auto = proc:rw sys:rw
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lxc.include = /usr/share/lxc/config/common.conf
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```
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And run the container as privileged (security.privileged = true).
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⚠️ Security warning: privileged LXC containers with these capabilities are essentially “mini-VMs” with host-level power. Not recommended on multi-tenant systems!!
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