#!/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

#######################################
# Hardening 'usb-guard'.
# Globals:
#   TARGET
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
hardening_usb() {
  ### Declare Arrays, HashMaps, and Variables.
  declare -r  var_logfile="/root/.ciss/cdi/log/4480_hardening_usb.log"

  chroot_logger "${TARGET}${var_logfile}"

  ### Preparing USBGuard: see https://www.privacy-handbuch.de/handbuch_91a.htm
  chroot_script "${TARGET}" "
    export INITRD=No
    apt-get install -y --no-install-recommends --no-install-suggests usbguard 2>&1 | tee -a ${var_logfile}

    touch /tmp/rules.conf
    usbguard generate-policy >| /tmp/rules.conf

    if [[ -f /etc/usbguard/rules.conf && -s /etc/usbguard/rules.conf ]]; then

      mkdir -p /root/.ciss/cdi/backup/etc/usbguard
      mv /etc/usbguard/rules.conf /root/.ciss/cdi/backup/etc/usbguard/usbguard_rules.conf
      mv /tmp/rules.conf /etc/usbguard/rules.conf
      chmod 0600 /etc/usbguard/rules.conf

    else

      rm -f /etc/usbguard/rules.conf
      mv /tmp/rules.conf /etc/usbguard/rules.conf
      chmod 0600 /etc/usbguard/rules.conf

    fi

    #cp -a /etc/usbguard/usbguard-daemon.conf /root/.ciss/cdi/backup/etc/usbguard/usbguard-daemon.conf
    #sed -i 's/PresentDevicePolicy=apply-policy/PresentDevicePolicy=allow/' /etc/usbguard/usbguard-daemon.conf
  "

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