#!/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

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
  echo "Missing unlock_wrapper.sh in /etc/initramfs-tools/files/"
  exit 1
fi

### Ensure directory structure in initramfs
mkdir -p "${DESTDIR}/etc/dropbear"
mkdir -p "${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"

### Include Bash
copy_exec /usr/bin/bash /usr/bin

### Include Busybox
copy_exec /usr/bin/busybox /usr/bin
copy_exec /usr/bin/busybox /bin

### Include lsblk (block device info tool)
copy_exec /usr/bin/lsblk /usr/bin

### Include mkpasswd
copy_exec /usr/bin/mkpasswd /usr/bin

### Include udevadm (udev management tool)
copy_exec /usr/bin/udevadm /usr/bin

### Include sha512sum e.g.
copy_exec /usr/bin/sha512sum /usr/bin
copy_exec /usr/bin/sha384sum /usr/bin

### Include Signature-Verifier
copy_exec /usr/bin/gpgv /usr/bin

### Include Whois
copy_exec /usr/bin/whois /usr/bin

### 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"

### Install Dropbear configuration
install -m 0444 /etc/dropbear/initramfs/dropbear.conf "${DESTDIR}/etc/dropbear/dropbear.conf"

### Install Dropbear Cryptroot Unlock Wrapper
install -m 0555 /etc/initramfs-tools/files/unlock_wrapper.sh "${DESTDIR}/usr/local/bin/unlock_wrapper.sh"
# TODO: Update preseed.yaml for pgp signing key AND / OR implementation of presigned unlock_wrapper.sh
#install -m 0444 /etc/initramfs-tools/files/unlock_wrapper.sh.sha384 "${DESTDIR}/usr/local/bin/unlock_wrapper.sh.sha384"
#install -m 0444 /etc/initramfs-tools/files/unlock_wrapper.sh.sha512 "${DESTDIR}/usr/local/bin/unlock_wrapper.sh.sha512"
#install -m 0444 /etc/initramfs-tools/files/unlock_wrapper.sh.sha384.sig "${DESTDIR}/usr/local/bin/unlock_wrapper.sh.sha384.sig"
#install -m 0444 /etc/initramfs-tools/files/unlock_wrapper.sh.sha512.sig "${DESTDIR}/usr/local/bin/unlock_wrapper.sh.sha512.sig"

### Install PGP Signing Keys
#install -m 0444 /root/.ciss/keys/pubring.gpg "${DESTDIR}/etc/keys/pubring.gpg"

### Install Dropbear Banner
#install -m 0444 /etc/dropbear/initramfs/banner "${DESTDIR}/etc/dropbear/banner"

echo "Successfully executed: [/etc/initramfs-tools/hooks/custom-initramfs.sh]."

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