#!/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 files and directories.
# Globals:
#   RECOVERY
#   TARGET
#   VAR_RUN_RECOVERY
#   VAR_SETUP_PATH
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
hardening_files() {
  declare     var_bin="" var_binary=""
  declare     var_target="${TARGET}"

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

  chmod 0700 "${var_target}/etc/cron.d" "${var_target}/etc/cron.daily" "${var_target}/etc/cron.hourly" "${var_target}/etc/cron.monthly" \
             "${var_target}/etc/cron.weekly"
  chmod 0700 "${var_target}/etc/sudoers.d"
  chmod 0700 "${var_target}/etc/crontab"

  [[ -f "${var_target}/etc/cron.deny" ]] && rm "${var_target}/etc/cron.deny"

  ### /etc/issue ---------------------------------------------------------------------------------------------------------------
  rm -f "${var_target}/etc/issue" "${var_target}/etc/issue.net"
  install -m 0644 -o root -g root "${VAR_SETUP_PATH}/includes/target/etc/issue" "${var_target}/etc/issue"
  install -m 0644 -o root -g root "${VAR_SETUP_PATH}/includes/target/etc/issue.net" "${var_target}/etc/issue.net"

  ### /root/.ansible -----------------------------------------------------------------------------------------------------------
  install -d -m 0700 -o root -g root "${var_target}/root/.ansible"

  ### /usr/bin/compiler --------------------------------------------------------------------------------------------------------
  for var_bin in as gcc g++ cc clang; do
    var_binary=$(readlink -f "${var_target}/usr/bin/${var_bin}") || {
      do_log "info" "file_only" "4430() Binary: '${var_bin}' not found, skipping."
      continue
    }
    chmod 0700 "${var_binary}" || {
      do_log "info" "file_only" "4430() Binary chmod 0700: '${var_bin}' failed, skipping."
    }
  done

  ### /etc/update-motd.d/10-uname ----------------------------------------------------------------------------------------------
  mkdir -p "${var_target}/root/.ciss/cdi/backup/etc/update-motd.d"
  cp -af "${var_target}/etc/update-motd.d/10-uname" "${var_target}/root/.ciss/cdi/backup/etc/update-motd.d/10-uname"

  cat << 'EOF' >| "${var_target}/etc/update-motd.d/10-uname"
#!/bin/sh
uname -snrm
EOF
  chmod 0755 /etc/update-motd.d/10-uname

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