92 lines
3.0 KiB
Bash
92 lines
3.0 KiB
Bash
#!/bin/bash
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# SPDX-Version: 3.0
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# SPDX-CreationInfo: 2025-06-17; WEIDNER, Marc S.; <msw@coresecret.dev>
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# SPDX-ExternalRef: GIT https://git.coresecret.dev/msw/CISS.debian.installer.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.installer
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# SPDX-Security-Contact: security@coresecret.eu
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### Options in "GRUB_CMDLINE_LINUX" are always effective, (incl. recovery).
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### Options in "GRUB_CMDLINE_LINUX_DEFAULT" are effective ONLY during normal boot (NOT during recovery mode).
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guard_sourcing
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#######################################
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# Hardening: update the Grub boot parameter and the Dropbear and Nuke parameters if opted in.
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# Globals:
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# ARY_BOOTPARAM
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# HMP_PATH_ENCLABEL
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# TARGET
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# VAR_CRYPT_ROOT
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# VAR_DROPBEAR
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# VAR_NUKE
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# VAR_NUKE_HASH
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# VAR_SEC_FW
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# VV_GRUB_CMDLINE_LINUX
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# VV_GRUB_CMDLINE_LINUX_DEFAULT
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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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update_grub_bootparameter() {
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### Declare Arrays, HashMaps, and Variables.
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declare var_nuke_string="" var_param="" var_label="" var_nuke_esc=""
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grub_extract_current_string
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# shellcheck disable=SC2034
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for var_param in "${ARY_BOOTPARAM[@]}"; do
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if [[ -z "${var_param}" ]]; then
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do_log "warn" "file_only" "4250() Empty GRUB parameter detected and skipped."
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continue
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fi
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if grep -qF -- "${var_param}" <<< "${VV_GRUB_CMDLINE_LINUX_DEFAULT}"; then
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do_log "info" "file_only" "4250() Skipping duplicate kernel parameter: '${var_param}'."
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continue
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fi
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VV_GRUB_CMDLINE_LINUX_DEFAULT="${VV_GRUB_CMDLINE_LINUX_DEFAULT} ${var_param}"
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done
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if [[ "${VAR_SEC_FW}" == "apparmor" ]]; then
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VV_GRUB_CMDLINE_LINUX="${VV_GRUB_CMDLINE_LINUX:+${VV_GRUB_CMDLINE_LINUX} }apparmor=1 security=apparmor lsm=lockdown,yama,integrity,apparmor,bpf"
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elif [[ "${VAR_SEC_FW}" == "selinux" ]]; then
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### We start in permissive mode first, so we don't pass 'enforcing=1' through the command line.
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VV_GRUB_CMDLINE_LINUX="${VV_GRUB_CMDLINE_LINUX:+${VV_GRUB_CMDLINE_LINUX} }selinux=1 security=selinux"
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fi
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if [[ "${VAR_DROPBEAR}" == "true" ]]; then
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var_label="${HMP_PATH_ENCLABEL["/"]}"
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VV_GRUB_CMDLINE_LINUX="${VV_GRUB_CMDLINE_LINUX} cryptdevice=${VAR_CRYPT_ROOT}:cryptroot root=/dev/mapper/${var_label}"
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fi
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if [[ "${VAR_NUKE}" == "true" ]]; then
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var_nuke_esc="${VAR_NUKE_HASH//$/\\$}"
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var_nuke_string="nuke=${var_nuke_esc}"
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# shellcheck disable=SC2034
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VV_GRUB_CMDLINE_LINUX="${VV_GRUB_CMDLINE_LINUX} ${var_nuke_string}"
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fi
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grub_finalize_string
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chroot_exec "${TARGET}" update-grub
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guard_dir && 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 update_grub_bootparameter
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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