ctmg - extremely simple encrypted container system
ctmg is an encrypted container manager for Linux using cryptsetup and various standard file system utilities. Containers have the extension .ct and are mounted at a directory of the same name, but without the extension. Very simple to understand, and very simple to implement; ctmg is a simple bash script.
Usage
Usage: ctmg [ new | delete | open | close | list ] [arguments...] ctmg new container_path container_size[units_suffix] ctmg delete container_path ctmg open container_path ctmg close container_path ctmg list
Calling ctmg with no arguments will call list if there are any containers open, and otherwise show the usage screen. Calling ctmg with a filename argument will call open if it is not already open and otherwise will call close.
Examples
Create a 100MiB encrypted container called "example"
zx2c4@thinkpad ~ $ ctmg create example 100MiB [#] truncate -s 100MiB /home/zx2c4/example.ct [#] cryptsetup --cipher aes-xts-plain64 --key-size 512 --hash sha512 --iter-time 5000 --batch-mode luksFormat /home/zx2c4/example.ct Enter passphrase: [#] chown 1000:1000 /home/zx2c4/example.ct [#] cryptsetup luksOpen /home/zx2c4/example.ct ct_example Enter passphrase for /home/zx2c4/example.ct: [#] mkfs.ext4 -q -E root_owner=1000:1000 /dev/mapper/ct_example [+] Created new encrypted container at /home/zx2c4/example.ct [#] cryptsetup luksClose ct_example
Open a container, add a file, and then close it
zx2c4@thinkpad ~ $ ctmg open example [#] cryptsetup luksOpen /home/zx2c4/example.ct ct_example Enter passphrase for /home/zx2c4/example.ct: [#] mkdir -p /home/zx2c4/example [#] mount /dev/mapper/ct_example /home/zx2c4/example [+] Opened /home/zx2c4/example.ct at /home/zx2c4/example zx2c4@thinkpad ~ $ echo "super secret" > example/mysecretfile.txt zx2c4@thinkpad ~ $ ctmg close example [#] umount /home/zx2c4/example [#] cryptsetup luksClose ct_example [#] rmdir /home/zx2c4/example [+] Closed /home/zx2c4/example.ct
Installation
$ git clone https://git.zx2c4.com/ctmg
$ cd ctmg
$ sudo make install
Or, use the package from your distribution:
Gentoo
# emerge ctmg