#!/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 || return "${ERR_GUARD_SOURCE}"

#######################################
# Hardening accounts: Google TOTP, Wordlists, masking ttys, expiration of accounts.
# Globals:
#   RECOVERY
#   TARGET
#   VAR_RUN_RECOVERY
#   VAR_SETUP_PATH
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
accounts_hardening() {
  ### Declare Arrays, HashMaps, and Variables.
  declare -a  ary_security_pkgs=()
  declare -r  var_logfile="/root/.ciss/cdi/log/4510_accounts_hardening.log"
  declare     var_target="${TARGET}"

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

  chroot_logger "${var_target}${var_logfile}"

  ### Installing Google TOTP, Wordlists.
  ary_security_pkgs=( "libpam-google-authenticator" "wamerican" "wbritish" "wfrench" "wngerman" )
  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 ${ary_security_pkgs[*]} 2>&1 | tee -a ${var_logfile}
  "

  ### Preparing 2fa hardening.
  install -d -m 0755 -o root -g root "${var_target}/etc/ciss"
  insert_header   "${var_target}/etc/ciss/2fa.map"
  insert_comments "${var_target}/etc/ciss/2fa.map"
  chmod 0644      "${var_target}/etc/ciss/2fa.map"

  ### Keep 'tty1' active, disable the rest.
  # shellcheck disable=SC2016
  chroot_script "${var_target}" '
    systemctl unmask getty@tty1.service
    systemctl enable getty@tty1.service
    for t in tty2 tty3 tty4 tty5 tty6; do
      systemctl mask getty@${t}.service
    done
    systemctl mask serial-getty@.service
  '

  chroot_script "${var_target}" "
    if [[ ! -f /etc/securetty ]]; then
      touch /etc/securetty
      chmod 0600 /etc/securetty
      chown root:root /etc/securetty
    fi
  "

  ### Hardening file permissions.
  chown root:root   "${var_target}/etc/passwd" "${var_target}/etc/group"
  chown root:shadow "${var_target}/etc/shadow" "${var_target}/etc/gshadow"
  chmod 0644        "${var_target}/etc/passwd" "${var_target}/etc/group"
  chmod 0640        "${var_target}/etc/shadow" "${var_target}/etc/gshadow"
  chmod 0600        "${var_target}/etc/security/access.conf"

  ### Hardening '/etc/login.defs'.
  mkdir -p        "${var_target}/root/.ciss/cdi/backup/etc"
  mv              "${var_target}/etc/login.defs" "${var_target}/root/.ciss/cdi/backup/etc/login.defs.bak"
  insert_header   "${var_target}/etc/login.defs"
  insert_comments "${var_target}/etc/login.defs"
  cat             "${VAR_SETUP_PATH}/includes/target/etc/login.defs" >> "${var_target}/etc/login.defs"

  ### Hardening '/etc/security/pwquality.conf'.
  mkdir -p        "${var_target}/root/.ciss/cdi/backup/etc/security"
  mv              "${var_target}/etc/security/pwquality.conf" "${var_target}/root/.ciss/cdi/backup/etc/security/pwquality.conf.bak"
  insert_header   "${var_target}/etc/security/pwquality.conf"
  insert_comments "${var_target}/etc/security/pwquality.conf"
  cat             "${VAR_SETUP_PATH}/includes/target/etc/security/pwquality.cnf" >> "${var_target}/etc/security/pwquality.conf"

  ### Hardening '/etc/security/access.conf'.
  mv              "${var_target}/etc/security/access.conf" "${var_target}/root/.ciss/cdi/backup/etc/security/access.conf.bak"
  insert_header   "${var_target}/etc/security/access.conf"
  insert_comments "${var_target}/etc/security/access.conf"
  cat             "${VAR_SETUP_PATH}/includes/target/etc/security/access.cnf" >> "${var_target}/etc/security/access.conf"

  ### Hardening password expiration; defaults to 16,384 days.
  install -m 0700 -o root -g root "${VAR_SETUP_PATH}/includes/chroot/hooks/4510_password_expiration.hooks.sh" \
    "${var_target}/root/.ciss/cdi/hooks/4510_password_expiration.hooks.sh"

  if ! chroot_script "${var_target}" "/root/.ciss/cdi/hooks/4510_password_expiration.hooks.sh" "emergency"; then

    do_log "warn" "file_only" "4510() Command: [chroot_script ${var_target} /root/.ciss/cdi/hooks/4510_password_expiration.hooks.sh emergency] failed."

  else

    do_log "debug" "file_only" "4510() Command: [chroot_script ${var_target} /root/.ciss/cdi/hooks/4510_password_expiration.hooks.sh emergency] successful."

  fi

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