#!/bin/bash
# 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

guard_sourcing

#######################################
# Install the 'dropbear-initramfs' and replace the binaries with those from the previous Ultra Hardened build.
# Globals:
#   DIR_TMP
#   TARGET
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
dropbear_initramfs() {
  ### Declare Arrays, HashMaps, and Variables.
  declare     var_file=""
  declare -r  var_logfile="/root/.ciss/cdi/log/4311_dropbear_initramfs.log"

  chroot_logger "${TARGET}${var_logfile}"

  chroot_script "${TARGET}" '
    export INITRD=No
    apt-get install -y --no-install-recommends --no-install-suggests dropbear-initramfs dropbear-bin 2>&1 | tee -a '"${var_logfile}"'
    echo ExitCode: $? >> '"${var_logfile}"'
  '

  chroot_script "${TARGET}" '
    export INITRD=No
    apt-get purge -y dropbear dropbear-run || true
    echo ExitCode: $? >> '"${var_logfile}"'
  '

  chroot_script "${TARGET}" '
    export INITRD=No
    apt-get install -y --no-install-recommends --no-install-suggests gpgv 2>&1 | tee -a '"${var_logfile}"'
    echo ExitCode: $? >> '"${var_logfile}"'
  '

  chroot_script "${TARGET}" '
    export INITRD=No
    apt-mark hold dropbear dropbear-initramfs 2>&1 | tee -a '"${var_logfile}"'
    echo ExitCode: $? >> '"${var_logfile}"'
  '

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


  for var_file in dbclient dropbearconvert dropbearkey; do
    mv "${TARGET}/usr/bin/${var_file}" "${TARGET}/usr/bin/${var_file}.trixie"
    install -D -m 0755 -o root -g root "${DIR_TMP}/build/dropbear-2025.88/${var_file}" "${TARGET}/usr/bin/"
    do_log "debug" "file_only" "4311() Installation [${var_file}] successful."
  done


  insert_header   "${TARGET}/etc/apt/preferences.d/99-mask-dropbear"
  insert_comments "${TARGET}/etc/apt/preferences.d/99-mask-dropbear"
  cat << 'EOF' >> "${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   "${TARGET}/etc/apt/preferences.d/99-mask-dropbear-initramfs"
  insert_comments "${TARGET}/etc/apt/preferences.d/99-mask-dropbear-initramfs"
  cat << 'EOF' >> "${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 "${TARGET}" "systemctl mask dropbear.service dropbear.socket"
  do_log "info" "file_only" "4311() Masked: [dropbear.service dropbear.socket]"

  guard_dir && return 0
}
### Prevents accidental 'unset -f'.
# shellcheck disable=SC2034
readonly -f dropbear_initramfs
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh