Marc S. Weidner
f1720a2321
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
119 lines
3.8 KiB
Bash
119 lines
3.8 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-10-11; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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set -Ceuo pipefail
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 '%s' starting ... \e[0m\n" "${0}"
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declare _key=""
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cd /etc/ssh
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rm -rf ssh_host_*key*
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if [[ -d /root/ssh ]]; then
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if compgen -G "/root/ssh/ssh_host_*" > /dev/null; then
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mv -t /etc/ssh -- /root/ssh/ssh_host_*
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fi
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if compgen -G "/root/ssh/*sha256sum.txt" > /dev/null; then
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mv -t /etc/ssh -- /root/ssh/*sha256sum.txt
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fi
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rm -rf /root/ssh
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else
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# shellcheck disable=SC2312
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ssh-keygen -o -N "" -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -C "root@live-$(date -I)"
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# shellcheck disable=SC2312
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ssh-keygen -o -N "" -t rsa -b 4096 -f /etc/ssh/ssh_host_rsa_key -C "root@live-$(date -I)"
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fi
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chmod 0600 /etc/ssh/ssh_host_*_key
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chown root:root /etc/ssh/ssh_host_*_key
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chmod 0644 /etc/ssh/ssh_host_*_key.pub
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chown root:root /etc/ssh/ssh_host_*_key.pub
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chmod 0440 /etc/ssh/*sha256sum.txt
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chown root:root /etc/ssh/*sha256sum.txt
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awk '$5 >= 4000' /etc/ssh/moduli >| /etc/ssh/moduli.safe
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rm -rf /etc/ssh/moduli
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mv /etc/ssh/moduli.safe /etc/ssh/moduli
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chmod 0600 /etc/ssh/sshd_config /etc/ssh/ssh_config
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ssh-keygen -r @ >| /root/sshfp
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###########################################################################################
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# Remarks: The file /etc/profile.d/idle-users.sh is created to set two read-only #
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# environment variables: TMOUT and HISTFILE. #
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# TMOUT=14400 ensures that users are automatically logged out after 4 hours of inactivity.#
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# readonly HISTFILE ensures that the command history cannot be changed. #
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# The chmod +x command ensures that the file is executed in every shell session. #
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###########################################################################################
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cat << 'EOF' >| /etc/profile.d/idle-users.sh
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-10-11; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.live.builder.git
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# SPDX-FileContributor: WEIDNER, Marc S.; Centurion Intelligence Consulting Agency
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# SPDX-FileCopyrightText: 2024-2025; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-FileType: SOURCE
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# SPDX-License-Identifier: EUPL-1.2 OR LicenseRef-CCLA-1.0
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# SPDX-LicenseComment: This file is part of the CISS.debian.installer.secure framework.
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# SPDX-PackageName: CISS.debian.live.builder
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# SPDX-Security-Contact: security@coresecret.eu
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case $- in
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*i*)
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TMOUT=14400
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export TMOUT
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readonly TMOUT
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;;
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esac
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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EOF
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chmod +x /etc/profile.d/idle-users.sh
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mkdir -p /etc/systemd/system/ssh.service.d
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cat << 'EOF' >| /etc/systemd/system/ssh.service.d/override.conf
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[Unit]
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After=ufw.service
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Requires=ufw.service
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EOF
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chmod 0644 /etc/systemd/system/ssh.service.d/override.conf
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### Final checks. Verify host keys after installation.
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if command -v ssh-keygen >/dev/null 2>&1; then
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for _key in /etc/ssh/ssh_host_*key; do
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### Only consider regular files
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[[ -f "${_key}" ]] || continue
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ssh-keygen -lf "${_key}" >/dev/null || exit 42
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ssh-keygen -yf "${_key}" >/dev/null || exit 42
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done
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fi
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/usr/sbin/sshd -t || exit 42
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ '%s' applied successfully. \e[0m\n" "${0}"
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exit 0
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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