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V8.02.512.2025.05.30

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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
This commit is contained in:
Marc S. Weidner
2025-05-30 00:28:39 +02:00
parent 2680012395
commit b2282d3475
172 changed files with 14057 additions and 41 deletions
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64
config/hooks/live/9930_hardening_ssh.chroot Normal file
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#!/bin/bash
# SPDX-Version: 3.0
# SPDX-CreationInfo: 2025-05-05; 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: 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.live.builder
# SPDX-Security-Contact: security@coresecret.eu
set -C -e -u -o pipefail
printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"
# sleep 1
cd /etc/ssh || {
printf "\e[91mm++++ ++++ ++++ ++++ ++++ ++++ ++ Could not find /etc/ssh \e[0m\n"
}
rm -rf ssh_host_*key*
ssh-keygen -o -N "" -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -C "root@live-$(date -I)"
ssh-keygen -o -N "" -t rsa -b 8192 -f /etc/ssh/ssh_host_rsa_key -C "root@live-$(date -I)"
awk '$5 >= 4000' /etc/ssh/moduli >| /etc/ssh/moduli.safe
rm -rf /etc/ssh/moduli
mv /etc/ssh/moduli.safe /etc/ssh/moduli
chmod 0600 /etc/ssh/ssh_host_*_key
chown root:root /etc/ssh/ssh_host_*_key
chmod 0644 /etc/ssh/ssh_host_*_key.pub
chown root:root /etc/ssh/ssh_host_*_key.pub
chmod 600 /etc/ssh/sshd_config /etc/ssh/ssh_config
touch /root/sshfp
ssh-keygen -r @ >| /root/sshfp
###########################################################################################
# Remarks: The file /etc/profile.d/idle-users.sh is created to set two read-only #
# environment variables: TMOUT and HISTFILE. #
# TMOUT=14400 ensures that users are automatically logged out after 4 hours of inactivity.#
# readonly HISTFILE ensures that the command history cannot be changed. #
# The chmod +x command ensures that the file is executed in every shell session. #
###########################################################################################
cat << 'EOF' >| /etc/profile.d/idle-users.sh
declare -girx TMOUT=14400
EOF
chmod +x /etc/profile.d/idle-users.sh
mkdir -p /etc/systemd/system/ssh.service.d
cat << 'EOF' >| /etc/systemd/system/ssh.service.d/override.conf
[Unit]
After=ufw.service
Requires=ufw.service
EOF
chmod 0644 /etc/systemd/system/ssh.service.d/override.conf
printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
# sleep 1
exit 0
# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh