Marc S. Weidner
f4cec85f7f
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Signed-off-by: Marc S. Weidner <msw@coresecret.dev>
287 lines
11 KiB
Bash
287 lines
11 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-05-05; 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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guard_sourcing || return "${ERR_GUARD_SRCE}"
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#######################################
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# Module for accompanying all 'CISS.debian.hardening' features into the Live ISO image.
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# Globals:
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# ARY_HANDLER_JUMPHOST
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# ARY_HANDLER_JUMPHOST_UNIQUE
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# BASH_SOURCE
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# VAR_ARCHITECTURE
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# VAR_HANDLER_BUILD_DIR
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# VAR_SSHFP
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# VAR_SSHPORT
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# VAR_SSHPUBKEY
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# VAR_WORKDIR
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# Arguments:
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# None
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# Returns:
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# 0: on success
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#######################################
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hardening_ultra() {
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 %s starting ... \e[0m\n" "${BASH_SOURCE[0]}"
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# shellcheck disable=SC2164
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cd "${VAR_WORKDIR}"
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### ./config/bootloaders -----------------------------------------------------------------------------------------------------
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 Copying ./config/bootloaders ... \e[0m\n"
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if [[ ! -d "${VAR_HANDLER_BUILD_DIR}/config/bootloaders" ]]; then
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mkdir -p "${VAR_HANDLER_BUILD_DIR}/config/bootloaders"
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cp -af ./config/bootloaders "${VAR_HANDLER_BUILD_DIR}/config"
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else
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cp -af ./config/bootloaders "${VAR_HANDLER_BUILD_DIR}/config"
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fi
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Copying ./config/bootloaders done.\e[0m\n"
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### ./config/includes.binary -------------------------------------------------------------------------------------------------
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 Copying ./config/includes.binary ... \e[0m\n"
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if [[ ! -d "${VAR_HANDLER_BUILD_DIR}/config/includes.binary/boot/grub" ]]; then
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mkdir -p "${VAR_HANDLER_BUILD_DIR}/config/includes.binary/boot/grub"
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cp -af ./config/includes.binary "${VAR_HANDLER_BUILD_DIR}/config"
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else
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cp -af ./config/includes.binary "${VAR_HANDLER_BUILD_DIR}/config"
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fi
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Copying ./config/includes.binary done.\e[0m\n"
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### ./config/includes.chroot -------------------------------------------------------------------------------------------------
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 Copying ./config/includes.chroot ... \e[0m\n"
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if [[ ! -d "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot" ]]; then
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mkdir -p "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot"
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cp -af ./config/includes.chroot/ "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/"
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chmod 0755 ./config/includes.chroot/etc/ciss/keys
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chmod 0444 ./config/includes.chroot/etc/ciss/keys/*
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else
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cp -af ./config/includes.chroot/ "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/"
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chmod 0755 ./config/includes.chroot/etc/ciss/keys
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chmod 0444 ./config/includes.chroot/etc/ciss/keys/*
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fi
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Copying ./config/includes.chroot done.\e[0m\n"
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### ./config/hooks/early -----------------------------------------------------------------------------------------------------
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if [[ -d "${VAR_WORKDIR}/config/hooks/early" ]]; then
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 Copying ./config/hooks/early ... \e[0m\n"
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if [[ ! -d "${VAR_HANDLER_BUILD_DIR}/config/hooks/early" ]]; then
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mkdir -p "${VAR_HANDLER_BUILD_DIR}/config/hooks/early"
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cp -af ./config/hooks/early "${VAR_HANDLER_BUILD_DIR}/config/hooks"
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else
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cp -af ./config/hooks/early "${VAR_HANDLER_BUILD_DIR}/config/hooks"
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fi
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Copying ./config/hooks/early done.\e[0m\n"
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fi
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### ./config/hooks/live ------------------------------------------------------------------------------------------------------
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 Copying ./config/hooks/live ... \e[0m\n"
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if [[ ! -d "${VAR_HANDLER_BUILD_DIR}/config/hooks/live" ]]; then
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mkdir -p "${VAR_HANDLER_BUILD_DIR}/config/hooks/live"
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cp -af ./config/hooks/live "${VAR_HANDLER_BUILD_DIR}/config/hooks"
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else
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cp -af ./config/hooks/live "${VAR_HANDLER_BUILD_DIR}/config/hooks"
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fi
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Copying ./config/hooks/live done.\e[0m\n"
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### ./config/package-lists ---------------------------------------------------------------------------------------------------
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 Copying ./config/package-lists ... \e[0m\n"
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if [[ ! -d "${VAR_HANDLER_BUILD_DIR}/config/package-lists" ]]; then
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mkdir -p "${VAR_HANDLER_BUILD_DIR}/config/package-lists"
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fi
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cp -af ./config/package-lists/live.list.common.chroot "${VAR_HANDLER_BUILD_DIR}/config/package-lists/live.list.chroot"
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case "${VAR_ARCHITECTURE}" in
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amd64)
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declare arch_list="./config/package-lists/live.list.amd64.chroot"
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declare arch_comment="# amd64 specific packages"
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;;
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arm64)
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declare arch_list="./config/package-lists/live.list.arm64.chroot"
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declare arch_comment="# arm64 specific packages"
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;;
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*)
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printf "\e[91m++++ ++++ ++++ ++++ ++++ ++++ ++ ❌ Unsupported architecture '%s'.\e[0m\n" "${VAR_ARCHITECTURE}"
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exit 1
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;;
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esac
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declare pkgs
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# shellcheck disable=SC2312
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mapfile -t pkgs < <(
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grep -v '^\s*#' "${arch_list}" | sed '/^\s*$/d'
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)
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awk -v comment="${arch_comment}" -v n_pkgs="${#pkgs[@]}" -v pkgs="$(printf '%s\n' "${pkgs[@]}")" '
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BEGIN {
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split(pkgs, pkg_arr, "\n")
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inserted = 0
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}
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{
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# Detect the vim-modeline (last line marker)
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if ($0 ~ /^# vim:.*$/ && !inserted) {
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print comment
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for (i = 1; i <= length(pkg_arr); i++) {
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print pkg_arr[i]
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}
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inserted = 1
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}
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print
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}
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' "${VAR_HANDLER_BUILD_DIR}/config/package-lists/live.list.chroot" >| temp && mv temp "${VAR_HANDLER_BUILD_DIR}/config/package-lists/live.list.chroot"
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Copying ./config/package-lists done.\e[0m\n"
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### Updating SSH Keys, Ports -------------------------------------------------------------------------------------------------
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 Updating SSH Keys, Ports ... \e[0m\n"
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### ./config/includes.chroot/root/.ssh ---------------------------------------------------------------------------------------
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install -d -m 0700 "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh"
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install -m 0600 -o root -g root "${VAR_SSHPUBKEY}/authorized_keys" "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/root/.ssh/"
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declare -r sshport="${VAR_SSHPORT:-22}"
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### /config/includes.chroot/etc/ssh/sshd_config
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# shellcheck disable=SC2155
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declare pad="$(printf '%-29s' 'Port')"
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sed -i -E "/PORT_MUST_BE_CHANGED/ s|.*|${pad}${sshport}|" "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/etc/ssh/sshd_config"
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### /config/hooks/live/9950_hardening_fail2ban.chroot
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sed -i "s|PORT_MUST_BE_SET|${sshport}|g" "${VAR_HANDLER_BUILD_DIR}/config/hooks/live/9950_hardening_fail2ban.chroot"
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### /config/hooks/live/0900_ufw_setup.chroot
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sed -i "s|SSHPORT_MUST_BE_SET|${sshport}|g" "${VAR_HANDLER_BUILD_DIR}/config/hooks/live/0900_ufw_setup.chroot"
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### /config/hooks/live/0900_ufw_setup.chroot
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if [[ ${#ARY_HANDLER_JUMPHOST[@]} -gt 0 ]]; then
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declare file="${VAR_HANDLER_BUILD_DIR}/config/hooks/live/0900_ufw_setup.chroot"
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sed -i "/^ufw allow in \"\${SSHPORT}\"\/tcp comment 'Incoming SSH (Custom-Port)'$/d" "${file}"
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declare line
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# shellcheck disable=SC2312
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line=$(grep -n '^ufw default deny forward$' "${file}" | cut -d: -f1)
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if [[ -z "${line}" ]]; then
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printf "\e[91m++++ ++++ ++++ ++++ ++++ ++++ ++ ❌'ufw default deny forward' not found in: '%s'\e[0m\n" "${file}" >&2
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exit 1
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fi
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declare host
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for host in "${ARY_HANDLER_JUMPHOST_UNIQUE[@]}"; do
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((line++))
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sed -i "${line}a ufw allow from ${host} to any port ${sshport} proto tcp comment \"Incoming SSH ([${host}]:${sshport})\"" "${file}"
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done
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fi
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Updating SSH Keys, Ports done. \e[0m\n"
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### ./config/includes.chroot/etc/hosts. --------------------------------------------------------------------------------------
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if [[ -f "${VAR_WORKDIR}/hosts.allow" ]]; then
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 SSH Hardening Ultra ... \e[0m\n"
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mv "${VAR_WORKDIR}/hosts.allow" "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/etc"
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mv "${VAR_WORKDIR}/hosts.deny" "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/etc"
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chmod 0644 "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/etc/hosts.allow"
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chmod 0644 "${VAR_HANDLER_BUILD_DIR}/config/includes.chroot/etc/hosts.deny"
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ SSH Hardening Ultra done.\e[0m\n"
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fi
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### ./config/hooks/live/9950_hardening_fail2ban.chroot -----------------------------------------------------------------------
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if ((${#ARY_HANDLER_JUMPHOST[@]} > 0)); then
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printf "\e[95m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 Updating fail2ban Jumphosts IPs ... \e[0m\n"
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# Join array entries with spaces, preserving any newlines
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declare ips="${ARY_HANDLER_JUMPHOST[*]}"
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# Flatten to a single line and strip literal brackets []
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declare flat_ips
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# shellcheck disable=SC2312
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flat_ips=$(printf "%s" "${ips}" | tr '\n' ' ' | tr -d '[]')
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# flat_ips now contains e.g., "123.128.111.42 2a03:ffff:0815:4711:... 2a03:.../64"
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# Perform an in-place replacement of IGNORE_IP_MUST_BE_SET with the cleaned list
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sed -i -E "/^[[:space:]]*ignoreip[[:space:]]*=/ s|IGNORE_IP_MUST_BE_SET|${flat_ips}|g" "${VAR_HANDLER_BUILD_DIR}/config/hooks/live/9950_hardening_fail2ban.chroot"
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Updating fail2ban Jumphosts IPs done. \e[0m\n"
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else
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printf "\e[93m++++ ++++ ++++ ++++ ++++ ++++ ++ 🧪 No jump hosts configured, removing placeholder ... \e[0m\n"
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sed -i 's/IGNORE_IP_MUST_BE_SET//g' "${VAR_HANDLER_BUILD_DIR}/config/hooks/live/9950_hardening_fail2ban.chroot"
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ Placeholder removed. \e[0m\n"
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fi
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printf "\e[92m++++ ++++ ++++ ++++ ++++ ++++ ++ ✅ %s successfully applied. \e[0m\n" "${BASH_SOURCE[0]}"
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return 0
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}
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### Prevents accidental 'unset -f'.
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# shellcheck disable=SC2034
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readonly -f hardening_ultra
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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