#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-10-11; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.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.live.builder
# SPDX-Security-Contact: security@coresecret.eu
set -Ceuo pipefail

printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"

[[ -r /root/ciss_xdg_tmp.sh ]] && . /root/ciss_xdg_tmp.sh
export DEBIAN_FRONTEND="noninteractive" INITRD="No"

### Declare Arrays, HashMaps, and Variables.
declare     var_file=""
declare -r  var_logfile="/root/.ciss/cdi/log/4311_dropbear_initramfs.log"
declare     var_target="${TARGET}"

### Check for TARGET / RECOVERY.
[[ "${VAR_RUN_RECOVERY}" == "true" ]] && var_target="${RECOVERY}"

chroot_logger "${var_target}${var_logfile}"

chroot_script "${var_target}" "
    export INITRD=No
    [[ -r /root/ciss_xdg_tmp.sh ]] && . /root/ciss_xdg_tmp.sh
    apt-get install -y --no-install-recommends --no-install-suggests dropbear-initramfs dropbear-bin 2>&1 | tee -a ${var_logfile}
  "

chroot_script "${var_target}" "
    export INITRD=No
    [[ -r /root/ciss_xdg_tmp.sh ]] && . /root/ciss_xdg_tmp.sh
    apt-get purge -y dropbear dropbear-run || true
  "

chroot_script "${var_target}" "
    export INITRD=No
    [[ -r /root/ciss_xdg_tmp.sh ]] && . /root/ciss_xdg_tmp.sh
    apt-get install -y --no-install-recommends --no-install-suggests gpgv 2>&1 | tee -a ${var_logfile}
  "

chroot_script "${var_target}" "
    export INITRD=No
    [[ -r /root/ciss_xdg_tmp.sh ]] && . /root/ciss_xdg_tmp.sh
    apt-mark hold dropbear dropbear-initramfs 2>&1 | tee -a ${var_logfile}
  "

mv "${var_target}/usr/sbin/dropbear" "${var_target}/usr/sbin/dropbear.trixie"
install -D -m 0755 -o root -g root "${DIR_TMP}/build/dropbear-2025.88/dropbear" "${var_target}/usr/sbin/"
do_log "debug" "file_only" "4311() Installation [dropbear] successful."


for var_file in dbclient dropbearconvert dropbearkey; do

  mv "${var_target}/usr/bin/${var_file}" "${var_target}/usr/bin/${var_file}.trixie"
  install -D -m 0755 -o root -g root "${DIR_TMP}/build/dropbear-2025.88/${var_file}" "${var_target}/usr/bin/"
  do_log "debug" "file_only" "4311() Installation [${var_file}] successful."

done

mkdir -p "${var_target}/etc/initramfs-tools/scripts/init-bottom"

cat << 'EOF' >| "${var_target}/etc/initramfs-tools/scripts/init-bottom/zzzz-dropbear-kill"
#!/bin/sh

PREREQ=""
prereqs() { echo "${PREREQ}"; }
# shellcheck disable=SC2249
case "${1}" in
  prereqs) prereqs; exit 0 ;;
esac

### Stop dropbear shipped in the initramfs after root pivot.
[ -x /bin/pidof ] || exit 0

P=$(/bin/pidof dropbear 2>/dev/null) || true

[ -n "${P}" ] || exit 0

/bin/kill -TERM "${P}" 2>/dev/null || true
/bin/sleep 1

/bin/kill -KILL "${P}" 2>/dev/null || true
exit 0

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

chmod 0755 "${var_target}/etc/initramfs-tools/scripts/init-bottom/zzzz-dropbear-kill"

insert_header   "${var_target}/etc/apt/preferences.d/99-mask-dropbear"
insert_comments "${var_target}/etc/apt/preferences.d/99-mask-dropbear"
cat << 'EOF' >> "${var_target}/etc/apt/preferences.d/99-mask-dropbear"
# Never install the dropbear daemon package at all.
Package: dropbear
Pin: release *
Pin-Priority: -1

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

insert_header   "${var_target}/etc/apt/preferences.d/99-mask-dropbear-initramfs"
insert_comments "${var_target}/etc/apt/preferences.d/99-mask-dropbear-initramfs"
cat << 'EOF' >> "${var_target}/etc/apt/preferences.d/99-mask-dropbear-initramfs"
# Keep the currently installed initramfs integration; never upgrade it.
Package: dropbear-initramfs
Pin: release *
Pin-Priority: -1

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

chroot_script "${var_target}" "systemctl mask dropbear.service dropbear.socket"
do_log "info" "file_only" "4311() Masked: [dropbear.service dropbear.socket]"

printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"

exit 0
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh