#!/bin/sh
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.git
# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-FileType: SOURCE
# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
# SPDX-PackageName: CISS.debian.installer
# SPDX-Security-Contact: security@coresecret.eu
# SPDX-Comment: Hook script (initramfs) for setting up the CISS.debian.installer hardened dropbear environment, incl. Luks Nuke.

set -e

printf "\e[95mStarting: [/etc/initramfs-tools/hooks/9999-custom-initramfs.sh] \n\e[0m"

PREREQ=""
prereqs() { echo "${PREREQ}"; }
case "${1}" in
  prereqs) prereqs; exit 0 ;;
esac

. /usr/share/initramfs-tools/hook-functions

# shellcheck disable=2292
if [ ! -e /etc/initramfs-tools/files/unlock_wrapper.sh ]; then
  printf "\e[91mMissing unlock_wrapper.sh in: [/etc/initramfs-tools/files/] \n\e[0m"
  exit 1
fi


### Ensure directory structure in initramfs
mkdir -p "${DESTDIR}/usr/bin"
mkdir -p "${DESTDIR}/etc/keys"
mkdir -p "${DESTDIR}/usr/local/bin"
mkdir -p "${DESTDIR}/etc/initramfs-tools/conf.d"
mkdir -p "${DESTDIR}/etc/initramfs-tools/scripts/init-premount"
mkdir -p "${DESTDIR}/usr/sbin"


### Include bash
copy_exec /usr/bin/bash /usr/bin/bash
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/bash /usr/bin/bash] \n\e[0m"


### Include blkid
copy_exec /usr/sbin/blkid /usr/sbin/blkid
printf "\e[92mSuccessfully executed: [copy_exec /usr/sbin/blkid /usr/sbin/blkid] \n\e[0m"


### Include busybox
copy_exec /usr/bin/busybox /usr/busybox
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/busybox /usr/busybox] \n\e[0m"


### Include GNU coreutils 'sort' (has -V)
copy_exec /usr/bin/sort /usr/bin/sort
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/sort /usr/bin/sort] \n\e[0m"


### Include gpgv
copy_exec /usr/bin/gpgv /usr/bin/gpgv
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/gpgv /usr/bin/gpgv] \n\e[0m"


### Include lsblk
copy_exec /usr/bin/lsblk /usr/bin/lsblk
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/lsblk /usr/bin/lsblk] \n\e[0m"


### Include mkpasswd
copy_exec /usr/bin/mkpasswd /usr/mkpasswd
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/mkpasswd /usr/mkpasswd] \n\e[0m"
copy_exec /usr/bin/mkpasswd /usr/bin/mkpasswd
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/mkpasswd /usr/bin/mkpasswd] \n\e[0m"


### Include udevadm (udev management tool)
copy_exec /usr/bin/udevadm /usr/bin/udevadm
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/udevadm /usr/bin/udevadm] \n\e[0m"


### Include sha384sum, sha512sum
copy_exec /usr/bin/sha384sum /usr/bin/sha384sum
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/sha384sum /usr/bin/sha384sum ] \n\e[0m"
copy_exec /usr/bin/sha512sum /usr/bin/sha512sum
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/sha512sum /usr/bin/sha512sum] \n\e[0m"


### Include tree
copy_exec /usr/bin/tree /usr/bin/tree
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/tree /usr/bin/tree] \n\e[0m"


### Include whois
copy_exec /usr/bin/whois /usr/bin/whois
printf "\e[92mSuccessfully executed: [copy_exec /usr/bin/whois /usr/bin/whois] \n\e[0m"


### Link busybox applets for compatibility
for dir in bin usr/bin; do
  ln -sf busybox "${DESTDIR}/${dir}/cat"
  ln -sf busybox "${DESTDIR}/${dir}/sleep"
done


### Install Dropbear firewall configuration
install -m 0444 /etc/initramfs-tools/files/dropbear_fw.conf "${DESTDIR}/etc/initramfs-tools/conf.d/dropbear_fw.conf"
printf "\e[92mSuccessfully executed: [install -m 0444 /etc/initramfs-tools/files/dropbear_fw.conf %s/etc/initramfs-tools/conf.d/dropbear_fw.conf] \n\e[0m" "${DESTDIR}"


### Install Dropbear configuration
install -m 0444 /etc/dropbear/initramfs/dropbear.conf "${DESTDIR}/etc/dropbear/dropbear.conf"
printf "\e[92mSuccessfully executed: [install -m 0444 /etc/dropbear/initramfs/dropbear.conf %s/etc/dropbear/dropbear.conf] \n\e[0m" "${DESTDIR}"


### Install Dropbear 'cryptroot-unlock'-Wrapper
install -m 0555 /etc/initramfs-tools/files/unlock_wrapper.sh "${DESTDIR}/usr/local/bin/unlock_wrapper.sh"
printf "\e[92mSuccessfully executed: [install -m 0555 /etc/initramfs-tools/files/unlock_wrapper.sh %s/usr/local/bin/unlock_wrapper.sh] \n\e[0m" "${DESTDIR}"

install -m 0444 /etc/initramfs-tools/files/unlock_wrapper.sh.sha512 "${DESTDIR}/usr/local/bin/unlock_wrapper.sh.sha512"
printf "\e[92mSuccessfully executed: [install -m 0444 /etc/initramfs-tools/files/unlock_wrapper.sh.sha512 %s/usr/local/bin/unlock_wrapper.sh.sha512] \n\e[0m" "${DESTDIR}"

install -m 0444 /etc/initramfs-tools/files/unlock_wrapper.sh.sha512.sig "${DESTDIR}/usr/local/bin/unlock_wrapper.sh.sha512.sig"
printf "\e[92mSuccessfully executed: [install -m 0444 /etc/initramfs-tools/files/unlock_wrapper.sh.sha512.sig %s/usr/local/bin/unlock_wrapper.sh.sha512.sig] \n\e[0m" "${DESTDIR}"


### Install PGP Signing Keys
install -m 0444 /root/.ciss/cdi/keys/unlock_wrapper_pubring.gpg "${DESTDIR}/etc/keys/unlock_wrapper_pubring.gpg"
printf "\e[92mSuccessfully executed: [install -m 0444 /root/.ciss/cdi/keys/unlock_wrapper_pubring.gpg %s/etc/keys/unlock_wrapper_pubring.gpg] \n\e[0m" "${DESTDIR}"


### Install Dropbear Banner
install -m 0444 /etc/dropbear/initramfs/banner "${DESTDIR}/etc/dropbear/banner"
printf "\e[92mSuccessfully executed: [install -m 0444 /etc/dropbear/initramfs/banner %s/etc/dropbear/banner] \n\e[0m" "${DESTDIR}"


printf "\e[92mSuccessfully executed: [/etc/initramfs-tools/hooks/9999-custom-initramfs.sh] \n\e[0m"

# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh