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/usr/lib/dracut/modules.d/91crypt-loop/   drwxr-xr-x
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Viewing file:     crypt-loop-lib.sh (1.58 KB)      -rwxr-xr-x

#!/bin/sh
# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
# ex: ts=4 sw=4 sts=0 et filetype=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/${mntp##*/}"

    if [ ! -b $key ]; then
        info "Keyfile has .img suffix, treating it as LUKS-encrypted loop keyfile container to unlock $device"

        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 "Tried setting it up, but keyfile block device was still not found!" 

        initqueue --onetime --finished --unique --name "crypt-loop-cleanup-10-${key##*/}" \
            $(command -v cryptsetup) "luksClose $key"
        initqueue --onetime --finished --unique --name "crypt-loop-cleanup-20-${loopdev##*/}" \
            $(command -v losetup) "-d $loopdev"
    else
        info "Existing keyfile found, re-using it for $device"
    fi

    cat $key
}