#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-11-12; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.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: LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1
# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
# SPDX-PackageName: CISS.debian.live.builder
# SPDX-Security-Contact: security@coresecret.eu
set -Ceuo pipefail

printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"

VAR_DATE="$(date +%F)"

cat << EOF >| /etc/systemd/system/ciss-remount-root.service
# SPDX-Version: 3.0
# SPDX-CreationInfo: ${VAR_DATE}; WEIDNER, Marc S.; <msw@coresecret.dev>
# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.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: LicenseRef-CNCL-1.1 OR LicenseRef-CCLA-1.1
# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
# SPDX-PackageName: CISS.debian.live.builder
# SPDX-Security-Contact: security@coresecret.eu

[Unit]
Description=Remount overlay root with nosuid,nodev
DefaultDependencies=no
After=local-fs.target
Before=basic.target

[Service]
Type=oneshot
ExecStart=/bin/mount -o remount,nosuid,nodev /

[Install]
WantedBy=sysinit.target

# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=conf
EOF

mkdir -p /etc/systemd/system/tmp.mount.d
cat << EOF >| /etc/systemd/system/tmp.mount.d/override.conf
[Mount]
Options=mode=1777,strictatime,nosuid,nodev,noexec,size=1%
EOF

mkdir -p /etc/systemd/system/dev-shm.mount.d
cat << EOF >| /etc/systemd/system/dev-shm.mount.d/override.conf
[Mount]
Options=mode=1777,nosuid,nodev,noexec,size=25%
EOF

systemctl enable ciss-remount-root.service

printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"

exit 0
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh