name : crypt-loop-lib.sh #!/bin/sh command -v ask_for_password >/dev/null || . /lib/dracut-crypt-lib.sh # loop_decrypt mnt_point keypath keydev device # # Decrypts symmetrically encrypted key to standard output. # # mnt_point - mount point where <keydev> is already mounted # keypath - LUKS encrypted loop file path relative to <mnt_point> # keydev - device on which key resides; only to display in prompt # device - device to be opened by cryptsetup; only to display in prompt loop_decrypt() { local mntp="$1" local keypath="$2" local keydev="$3" local device="$4" local key="/dev/mapper/$(str_replace "loop-$keydev-$mntp-$keypath" '/' '-')" if [ ! -b $key ]; then local loopdev=$(losetup -f "${mntp}/${keypath}" --show) local opts="-d - luksOpen $loopdev ${key##*/}" ask_for_password \ --cmd "cryptsetup $opts" \ --prompt "Password ($keypath on $keydev for $device)" \ --tty-echo-off [ -b $key ] || die "Failed to unlock $keypath on $keydev for $device." printf "%s\n" "cryptsetup luksClose \"$key\"" > ${hookdir}/cleanup/"crypt-loop-cleanup-10-${key##*/}".sh printf "%s\n" "losetup -d \"$loopdev\"" > ${hookdir}/cleanup/"crypt-loop-cleanup-20-${loopdev##*/}".sh fi cat $key }