#!/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
set -Ceuo pipefail

#######################################
# Password expiration hook to run inside chroot.
# Globals:
#   ary_users_to_update
#   var_max_days
#   var_user
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
main() {
  ### Declare Arrays, HashMaps, and Variables.
  declare -a  ary_users_to_update=()
  declare -i  var_max_days=16384
  declare     var_user=""

  printf "Chroot hook: [%s] starting ... \n" "${0}"

  # shellcheck disable=SC2312
  mapfile -t ary_users_to_update < <( awk -F: '$2 !~ /^[!*]/ { print $1 }' /etc/shadow )

  if [[ ${#ary_users_to_update[@]} -eq 0 ]]; then
    printf "No enabled-login accounts found in [/etc/shadow]. Exiting hook ... \n"
    printf "Chroot hook: [%s] applied successfully. \n" "${0}"
    exit 0
  fi

  for var_user in "${ary_users_to_update[@]}"; do
    printf "Setting max password age for user: [%s] to: [%s] days. \n" "${var_user}" "${var_max_days}"
    chage --maxdays "${var_max_days}" "${var_user}"
  done

  unset var_max_days var_user ary_users_to_update

  awk -F: '$2 !~ /^\$[0-9]/ && length($2)==13 { print $1,$2 }' /etc/shadow

  printf "All applicable accounts have been updated. \n"
  printf "Chroot hook: [%s] applied successfully. \n" "${0}"

  exit 0
}

main "$@"
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh