343 lines
11 KiB
Bash
343 lines
11 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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guard_sourcing
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#######################################
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# --- UEFI GRUB Installation Strategy ---
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#
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# We explicitly install GRUB using '--no-nvram' to avoid modifying NVRAM entries inside the chroot environment, which is
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# unreliable and can break host firmware boot order. Instead of relying on '--removable', we manually copy the GRUB EFI binary
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# to the fallback location 'EFI/BOOT/BOOTX64.EFI'. This mirrors the behavior of '--removable', but gives us more control over
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# the bootloader ID and file paths.
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# Result:
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# - GRUB is available under 'EFI/debian/grubx64.efi' (for manual boot entries).
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# - GRUB is also available as 'EFI/BOOT/BOOTX64.EFI' (UEFI fallback path, no NVRAM needed).
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# This setup ensures compatibility with systems that do not retain NVRAM entries (e.g., removable drives, VM firmware).
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#######################################
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#######################################
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# Installation and setup of the GRUB2 (backported) version.
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# The backported version MUST be installed for LUKS2 '/boot' encryption.
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# Every 'apt-get install' command is invoked by adding 'export INITRD=No'
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# to suppress the 'update-initramfs'-Kernel-Hooks, according to the initramfs-tools manpage:
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# https://manpages.debian.org/testing/initramfs-tools-core/initramfs-tools.7.en.html
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# Globals:
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# TARGET
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# VAR_ARCHITECTURE
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# VAR_RECIPE_FIRMWARE
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# VAR_SETUP_PATH
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# grub_background_enable
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# grub_background_path
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# grub_latest
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# grub_prober
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# grub_skip
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# var_update_grub_required
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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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# ERR_GRUB_BACKGROUND
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# ERR_GRUB_EFI_FORCE
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#######################################
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installation_grub() {
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### Declare Arrays, HashMaps, and Variables.
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declare -g var_update_grub_required="false" grub_update_nvram=${grub_update_nvram:-false}
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declare -r var_logfile="/root/.ciss/cdi/log/4230_update_grub.log"
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declare var_background=""
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chroot_logger "${TARGET}${var_logfile}"
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get_grub_modinfo_path
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ensure_lowercase "grub_skip"
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ensure_lowercase "grub_background_enable"
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ensure_lowercase "grub_prober"
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ensure_lowercase "grub_update_nvram"
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ensure_lowercase "grub_force_efi"
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do_log "debug" "file_only" "4230() Preseeded firmware: '${VAR_RECIPE_FIRMWARE}', architecture: '${VAR_ARCHITECTURE}'"
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if [[ "${grub_skip}" != "true" ]]; then
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### Install the GRUB2 backported version from the Bookworm backports repository.
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if [[ "${VAR_RECIPE_FIRMWARE}" == "uefi" ]]; then
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case "${VAR_ARCHITECTURE}" in
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amd64)
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chroot_script "${TARGET}" "
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export INITRD=No
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apt-get install -y --no-install-recommends grub2-common grub-efi-amd64 grub-efi-amd64-bin 2>&1 | tee -a ${var_logfile}
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echo ExitCode of PIPESTATUS[0]: [\${PIPESTATUS[0]}] >> ${var_logfile}
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"
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;;
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arm64)
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chroot_script "${TARGET}" "
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export INITRD=No
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apt-get install -y --no-install-recommends grub2-common grub-efi-arm64 grub-efi-arm64-bin 2>&1 | tee -a ${var_logfile}
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echo ExitCode of PIPESTATUS[0]: [\${PIPESTATUS[0]}] >> ${var_logfile}
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"
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;;
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*)
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do_log "emergency" "file_only" "4230() Unsupported architecture: ${VAR_ARCHITECTURE}"; return "${ERR_GRUB_ARCHITECTURE}"
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;;
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esac
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else
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chroot_script "${TARGET}" "
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export INITRD=No
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apt-get install -y --no-install-recommends grub2-common grub-pc grub-pc-bin 2>&1 | tee -a ${var_logfile}
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echo ExitCode of PIPESTATUS[0]: [\${PIPESTATUS[0]}] >> ${var_logfile}
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"
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fi
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### Enable booting from LUKS encrypted devices by default.
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cat << EOF >> "${TARGET}/etc/default/grub"
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# Enable booting from LUKS encrypted devices by default.
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GRUB_ENABLE_CRYPTODISK=y
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EOF
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var_update_grub_required="true"
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### Install a boot menu background.
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if [[ "${grub_background_enable}" == "true" ]]; then
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var_background=$(basename "${grub_background_path}")
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mkdir -p "${TARGET}/boot/grub"
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install -m 0640 -o root -g root "${VAR_SETUP_PATH}${grub_background_path}" "${TARGET}/boot/grub/${var_background}"
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cat << EOF >> "${TARGET}/etc/default/grub"
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# Enable boot menu background.
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GRUB_BACKGROUND="/boot/grub/${var_background}"
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# The resolution used on graphical terminal
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# note that you can use only modes which your graphic card supports via VBE
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# you can see them in real GRUB with the command 'vbeinfo'
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# GRUB_GFXMODE=1920x1080,1280x1024,1280x720,1024x768,800x600,640x480
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GRUB_GFXMODE=1280x720
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GRUB_GFXPAYLOAD_LINUX=keep
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EOF
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var_update_grub_required="true"
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fi
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### Change the GRUB OS detection configuration accordingly.
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if [[ "${grub_prober}" == "true" ]]; then
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chroot_exec "${TARGET}" export INITRD=No; apt-get install -y --no-install-recommends os-prober
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cat << EOF >> "${TARGET}/etc/default/grub"
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# If your computer has multiple operating systems installed, then you
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# probably want to run os-prober. However, if your computer is a host
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# for guest OSes installed via LVM or raw disk devices, running
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# os-prober can cause damage to those guest OSes as it mounts
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# filesystems to look for things.
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GRUB_DISABLE_OS_PROBER=false
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EOF
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var_update_grub_required="true"
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elif [[ "${grub_prober}" == "false" ]]; then
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cat << EOF >> "${TARGET}/etc/default/grub"
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# If your computer has multiple operating systems installed, then you
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# probably want to run os-prober. However, if your computer is a host
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# for guest OSes installed via LVM or raw disk devices, running
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# os-prober can cause damage to those guest OSes as it mounts
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# filesystems to look for things.
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GRUB_DISABLE_OS_PROBER=true
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EOF
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var_update_grub_required="true"
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fi
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else
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do_log "info" "file_only" "4230() GRUB2 setup skipped."
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return 0
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fi
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### Install grub on the specific device.
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if [[ "${VAR_RECIPE_FIRMWARE}" == "uefi" ]]; then
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install_grub_uefi
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elif [[ "${VAR_RECIPE_FIRMWARE}" == "bios" ]]; then
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install_grub_bios
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fi
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[[ "${var_update_grub_required}" == "true" ]] && chroot_exec "${TARGET}" update-grub
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if [[ "${grub_force_efi}" == "true" ]]; then
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mkdir -p "${TARGET}/boot/efi/EFI/BOOT"
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cp "${TARGET}/boot/efi/EFI/debian/grubx64.efi" "${TARGET}/boot/efi/EFI/BOOT/BOOTX64.EFI"
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do_log "info" "file_only" "4230() Installed: GRUB on Device: '${grub_bootdev}' [UEFI] on: Default EFI Boot-Path."
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fi
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### Setting the permissions to read and write for root only prevents non-root users from seeing the boot parameters or changing them.
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if [[ -f "${TARGET}/boot/grub/grub.cfg" ]]; then
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chown root:root "${TARGET}/boot/grub/grub.cfg"
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chmod 0640 "${TARGET}/boot/grub/grub.cfg"
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fi
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chmod -R 0700 "${TARGET}/etc/grub.d"
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guard_dir && return 0
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}
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#######################################
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# Installs GRUB to BIOS in BIOS mode.
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# Globals:
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# TARGET
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# VAR_MODINFO_PATH
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# grub_bootdev
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# var_update_grub_required
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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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# ERR_GRUB_INSTALL
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#######################################
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install_grub_bios() {
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### Declare Arrays, HashMaps, and Variables.
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declare -a ary_bios_arg=()
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declare var_bios_mod=""
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if ! [[ -x "${TARGET}${VAR_MODINFO_PATH}" ]]; then
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do_log "emergency" "file_only" "4230() Missing: [${VAR_MODINFO_PATH}]."
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return "${ERR_GRUB_INSTALL}"
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fi
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### Cryptographic modules.
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var_bios_mod+="cryptodisk gcry_rijndael gcry_sha256 gcry_sha512 gcry_whirlpool gcry_serpent gcry_twofish luks luks2 "
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### Filesystem modules.
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var_bios_mod+="btrfs ext2 "
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### Partitioning / Device / GPT
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var_bios_mod+="biosdisk mdraid1x part_gpt "
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### Device / Terminal modules.
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var_bios_mod+="boot linux efi_gop efi_uga gfxterm gfxterm_background gfxterm_menu normal search search_fs_uuid search_label "
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### Debug modules.
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var_bios_mod+="cat echo hexdump ls test terminfo"
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ary_bios_arg+=( --target=i386-pc --boot-directory=/boot "--modules=${var_bios_mod}" )
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chroot_exec "${TARGET}" grub-install "${ary_bios_arg[@]}" "${grub_bootdev}"
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do_log "info" "file_only" "4230() Installed: GRUB on Device: '${grub_bootdev}' [BIOS]."
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var_update_grub_required="true"
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return 0
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}
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#######################################
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# Installs GRUB to ESP in UEFI mode.
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# Globals:
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# TARGET
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# VAR_MODINFO_PATH
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# grub_bootdev
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# grub_force_efi
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# grub_update_nvram
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# var_update_grub_required
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# Arguments:
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# None
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# Returns:
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# 0: on success
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# ERR_GRUB_INSTALL
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#######################################
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install_grub_uefi() {
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### Declare Arrays, HashMaps, and Variables.
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declare -a ary_uefi_arg=()
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declare var_uefi_mod=""
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if ! [[ -x "${TARGET}${VAR_MODINFO_PATH}" ]]; then
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do_log "emergency" "file_only" "4230() Missing: [${VAR_MODINFO_PATH}]."
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return "${ERR_GRUB_INSTALL}"
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fi
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### Cryptographic modules.
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var_uefi_mod+="cryptodisk gcry_rijndael gcry_sha256 gcry_sha512 gcry_whirlpool gcry_serpent gcry_twofish luks luks2 "
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### Filesystem modules.
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var_uefi_mod+="btrfs ext2 "
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### Partitioning / Device / GPT
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var_uefi_mod+="mdraid1x part_gpt "
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### Device / Terminal modules.
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var_uefi_mod+="boot linux efi_gop efi_uga gfxterm gfxterm_background gfxterm_menu normal search search_fs_uuid search_label "
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### Debug modules.
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var_uefi_mod+="cat echo hexdump ls test terminfo"
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ary_uefi_arg+=( --target=x86_64-efi --boot-directory=/boot --efi-directory=/boot/efi --bootloader-id=debian "--modules=${var_uefi_mod}" )
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[[ "${grub_update_nvram}" == "false" ]] && ary_uefi_arg+=( --no-nvram )
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chroot_exec "${TARGET}" grub-install "${ary_uefi_arg[@]}" "${grub_bootdev}" || return "${ERR_GRUB_INSTALL}"
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do_log "info" "file_only" "4230() Installed: GRUB on Device: '${grub_bootdev}' [UEFI]."
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var_update_grub_required="true"
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return 0
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}
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#######################################
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# Get the path of the required Grub modules.
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# Globals:
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# VAR_ARCHITECTURE
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# VAR_MODINFO_PATH
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# VAR_RECIPE_FIRMWARE
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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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get_grub_modinfo_path() {
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### Declare Arrays, HashMaps, and Variables.
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declare -gx VAR_MODINFO_PATH=""
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case "${VAR_RECIPE_FIRMWARE}" in
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uefi)
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case "${VAR_ARCHITECTURE}" in
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amd64) VAR_MODINFO_PATH="/usr/lib/grub/x86_64-efi/modinfo.sh" ;;
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arm64) VAR_MODINFO_PATH="/usr/lib/grub/arm64-efi/modinfo.sh" ;;
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i386) VAR_MODINFO_PATH="/usr/lib/grub/i386-efi/modinfo.sh" ;;
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*) ;;
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esac
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;;
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bios)
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VAR_MODINFO_PATH="/usr/lib/grub/i386-pc/modinfo.sh"
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;;
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esac
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return 0
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}
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# vim: number et ts=2 sw=2 sts=2 ai tw=128 ft=sh
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