#!/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 hardening_jitterentropy.
# Globals:
#   RECOVERY
#   TARGET
#   VAR_RUN_RECOVERY
# Arguments:
#   None
# Returns:
#   0: on success
#######################################
hardening_jitterentropy() {
  declare    var_target="${TARGET}"

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

  mkdir -p "${var_target}/etc/systemd/system/jitterentropy-rngd.service.d"

  cat << EOF >> "${var_target}/etc/systemd/system/jitterentropy-rngd.service.d/override.conf"
[Service]
ExecStart=
ExecStart=/usr/sbin/jitterentropy-rngd --sp800-90b --osr=7
EOF

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