├── .github └── workflows │ └── main.yml ├── LICENSE ├── Makefile ├── README.md ├── hooks ├── 50-efi-sign.hook ├── 50-sbupdate-remove.hook └── 95-sbupdate.hook ├── sbupdate └── sbupdate.conf /.github/workflows/main.yml: -------------------------------------------------------------------------------- 1 | name: CI 2 | 3 | on: 4 | - push 5 | - pull_request 6 | 7 | jobs: 8 | check: 9 | runs-on: ubuntu-latest 10 | steps: 11 | - uses: actions/checkout@v1 12 | - name: Check 13 | run: make check 14 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | INSTALL ?= install 2 | SHELLCHECK ?= shellcheck 3 | 4 | .PHONY: all check install 5 | 6 | all: 7 | 8 | check: 9 | $(SHELLCHECK) sbupdate 10 | 11 | install: 12 | $(INSTALL) -D -m 0755 -t "$(DESTDIR)/usr/bin" sbupdate 13 | $(INSTALL) -D -m 0644 -t "$(DESTDIR)/etc" sbupdate.conf 14 | $(INSTALL) -o root -g root -m 0700 -d "$(DESTDIR)/etc/efi-keys" 15 | $(INSTALL) -D -m 0644 -t "$(DESTDIR)/usr/share/libalpm/hooks" \ 16 | $(addprefix hooks/,95-sbupdate.hook 50-sbupdate-remove.hook 50-efi-sign.hook) 17 | $(INSTALL) -D -m 0644 -t \ 18 | "$(DESTDIR)$(or $(DOCDIR),/usr/share/doc/sbupdate)" README.md 19 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # sbupdate 2 | 3 | ![](https://github.com/andreyv/sbupdate/workflows/CI/badge.svg) 4 | 5 | This tool allows you to sign Arch Linux kernels using your own Secure Boot keys. 6 | 7 | ## Installation 8 | 9 | You should be familiar with the process of creating, installing and using 10 | custom Secure Boot keys. See: 11 | * https://wiki.archlinux.org/index.php/Secure_Boot 12 | * https://www.rodsbooks.com/efi-bootloaders/controlling-sb.html 13 | 14 | After you have generated your custom keys, proceed with setup: 15 | * Install [sbupdate-git](https://aur.archlinux.org/packages/sbupdate-git/) from AUR 16 | * Place your custom keys in `/etc/efi-keys` 17 | * Configure `/etc/sbupdate.conf` (see [Configuration](#configuration)) 18 | * Run `sudo sbupdate` for first-time image generation 19 | 20 | For each installed Arch kernel, a signed UEFI image will be generated, by default 21 | in `/boot/EFI/Arch/-signed.efi`. Multiple images can be generated with 22 | advanced configuration. Now you can [add these images](#direct-booting-vs-boot-manager) 23 | to your UEFI firmware or boot manager configuration. 24 | 25 | After the initial setup, signed images will be (re)generated automatically when 26 | you install or update kernels using Pacman. 27 | 28 | Note that the kernel command line, initramfs and boot splash will be embedded in 29 | the signed UEFI image. 30 | 31 | ## Configuration 32 | 33 | Edit the file `/etc/sbupdate.conf`. Set your default kernel command line 34 | in the `CMDLINE_DEFAULT` variable. If the file `/etc/kernel/cmdline` exists, 35 | it is read into `CMDLINE_DEFAULT` automatically. 36 | 37 | The following optional settings are available: 38 | * Command line, initramfs[†](#ucode) and output name for each kernel 39 | config (each kernel can have multiple configs) 40 | * A list of additional boot files to sign 41 | * Locations of the key, ESP and output directories 42 | * Boot splash image 43 | 44 | 💡 _Hint_: Intel and AMD microcode updates are handled 45 | automatically. 46 | 47 | 💡 _Hint_: Disable boot splash to keep the UEFI boot logo. Oppositely, to keep 48 | the boot splash image during boot, add the `quiet video=efifb:nobgrt` 49 | parameters to the kernel command line. 50 | 51 | ## Direct booting vs. boot manager 52 | 53 | The generated images are UEFI executables and can be directly booted by UEFI 54 | firmware. Therefore, a separate boot manager such as systemd-boot is technically 55 | not required. This is similar to Linux [EFISTUB](https://wiki.archlinux.org/index.php/EFISTUB). 56 | 57 | Booting directly from firmware is arguably more secure, but may also be harder 58 | to set up and use. See [Using UEFI directly](https://wiki.archlinux.org/index.php/EFISTUB#Using_UEFI_directly) 59 | in the above article, with the exception that the kernel command line does not 60 | need to be specified in this case. 61 | 62 | --- 63 | 64 | Alternatively, you can use a boot manager. In this case you need to add the generated UEFI 65 | images to the boot manager configuration. For systemd-boot, the basic entry 66 | format is 67 | 68 | title Arch Linux 69 | efi /EFI/Arch/-signed.efi 70 | 71 | You also need to sign your boot manager's own UEFI executables with your 72 | custom keys. For systemd-boot, this is handled automatically on update. For 73 | first-time setup, run 74 | 75 | ```shell 76 | echo /usr/lib/systemd/boot/efi/systemd-boot*.efi | sudo sbupdate -f 77 | sudo bootctl update 78 | ``` 79 | 80 | For other boot managers, add corresponding ESP executables to the `EXTRA_SIGN` 81 | array in `/etc/sbupdate.conf` and re-run the tool if needed. You should 82 | remember to run the tool every time you update your boot manager's files. 83 | 84 | ⚠️ **Note**: When booting with Secure Boot disabled, options passed from an EFI shell 85 | (_even empty_) may override the built-in command line in the combined image, and 86 | the boot may fail. See [#4](https://github.com/andreyv/sbupdate/issues/4). 87 | 88 | 89 | ## ESP mount point 90 | 91 | Typically [ESP](https://wiki.archlinux.org/title/EFI_system_partition) is 92 | mounted on `/boot` and contains also the original, unsigned files such as the 93 | Linux kernel image and initramfs. These files are susceptible to offline 94 | tampering. 95 | 96 | It is recommended to mount ESP on a different directory, such as 97 | [`/efi`](https://www.freedesktop.org/software/systemd/man/bootctl.html#--esp-path=), 98 | and keep `/boot` itself on the secure root file system. This way ESP will only 99 | contain signed images which cannot be tampered with. 100 | 101 | See [Configuration](#configuration) to change the ESP directory. 102 | 103 | Note that if you use a boot manager other than systemd-boot, then its files 104 | still need to be on the ESP before they are signed. It is customary to sign 105 | these files right after they have been installed on the ESP. Direct booting is 106 | recommended for increased security. 107 | 108 | ## Related resources 109 | 110 | * https://wiki.archlinux.org/index.php/Unified_Extensible_Firmware_Interface 111 | * https://wiki.archlinux.org/index.php/Secure_Boot 112 | * https://www.rodsbooks.com/efi-bootloaders/index.html 113 | * https://bentley.link/secureboot/ 114 | * [`mkinitcpio(8)`](https://man.archlinux.org/man/mkinitcpio.8) `--uefi` option 115 | * [Foxboron/sbctl](https://github.com/Foxboron/sbctl) — Secure Boot Manager 116 | * [gdamjan/secure-boot](https://github.com/gdamjan/secure-boot) 117 | -------------------------------------------------------------------------------- /hooks/50-efi-sign.hook: -------------------------------------------------------------------------------- 1 | [Trigger] 2 | Operation = Install 3 | Operation = Upgrade 4 | Type = Path 5 | Target = usr/lib/fwupd/efi/fwupd*.efi 6 | Target = usr/lib/systemd/boot/efi/systemd-boot*.efi 7 | 8 | [Action] 9 | Description = Signing UEFI executables... 10 | When = PostTransaction 11 | Exec = /usr/bin/sbupdate -f 12 | Depends = sbsigntools 13 | NeedsTargets 14 | -------------------------------------------------------------------------------- /hooks/50-sbupdate-remove.hook: -------------------------------------------------------------------------------- 1 | [Trigger] 2 | Operation = Remove 3 | Type = Path 4 | Target = usr/lib/modules/*/vmlinuz 5 | 6 | [Action] 7 | Description = Removing UEFI kernel images... 8 | When = PreTransaction 9 | Exec = /usr/bin/sbupdate -k -r 10 | Depends = sbsigntools 11 | NeedsTargets 12 | -------------------------------------------------------------------------------- /hooks/95-sbupdate.hook: -------------------------------------------------------------------------------- 1 | [Trigger] 2 | Operation = Install 3 | Operation = Upgrade 4 | Type = Path 5 | Target = usr/lib/modules/*/vmlinuz 6 | 7 | [Trigger] 8 | Operation = Install 9 | Operation = Upgrade 10 | Operation = Remove 11 | Type = Path 12 | Target = usr/lib/initcpio/* 13 | Target = usr/src/*/dkms.conf 14 | 15 | [Trigger] 16 | Operation = Install 17 | Operation = Upgrade 18 | Operation = Remove 19 | Type = Package 20 | Target = intel-ucode 21 | Target = amd-ucode 22 | 23 | [Trigger] 24 | Operation = Upgrade 25 | Type = Package 26 | Target = systemd 27 | 28 | [Action] 29 | Description = Updating UEFI kernel images... 30 | When = PostTransaction 31 | Exec = /usr/bin/sbupdate -k 32 | Depends = systemd-ukify 33 | Depends = sbsigntools 34 | NeedsTargets 35 | -------------------------------------------------------------------------------- /sbupdate: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # 3 | # sbupdate -- Generate and sign kernel images for UEFI Secure Boot on Arch Linux 4 | # Copyright (C) 2016-2022 Andrey Vihrov 5 | # 6 | # This program is free software: you can redistribute it and/or modify 7 | # it under the terms of the GNU General Public License as published by 8 | # the Free Software Foundation, either version 3 of the License, or 9 | # (at your option) any later version. 10 | # 11 | # This program is distributed in the hope that it will be useful, 12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of 13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 | # GNU General Public License for more details. 15 | # 16 | # You should have received a copy of the GNU General Public License 17 | # along with this program. If not, see . 18 | 19 | set -eu 20 | 21 | shopt -s extglob 22 | 23 | readonly CONFFILE="/etc/sbupdate.conf" 24 | 25 | # Print an error and return unsuccessfully 26 | # $1: error message 27 | function error() { 28 | echo "$0: error: $1" >&2 29 | return 1 30 | } 31 | 32 | # Load configuration 33 | function load_config() { 34 | KEY_DIR="/etc/efi-keys" 35 | ESP_DIR="/boot" 36 | OUT_DIR="EFI/Arch" 37 | SPLASH="/usr/share/systemd/bootctl/splash-arch.bmp" 38 | BACKUP=1 39 | EXTRA_SIGN=() 40 | declare -g -A CONFIGS CMDLINE INITRD OUTPUT UFLAGS 41 | 42 | shopt -s nullglob 43 | INITRD_PREPEND=(/boot/@(intel|amd)-ucode.img) 44 | shopt -u nullglob 45 | 46 | [[ -f /etc/kernel/cmdline ]] && CMDLINE_DEFAULT="$(/dev/null; then 183 | echo "Skipping already signed file $1" 184 | elif (( HOOK )); then 185 | # Signing extra files from the hook is prohibited for security reasons 186 | echo "warning: failed to verify $1" >&2 187 | else 188 | echo "Signing $1" 189 | sign_file --output "$1" "$1" 190 | fi 191 | } 192 | 193 | # Individual file signing mode for use in hooks 194 | # 195 | # Read file names from standard input and create .signed files next to them. 196 | function run_file_mode() { 197 | while read -r file; do 198 | echo "Signing $(basename "${file}")" 199 | sign_file "${file}" 200 | done 201 | exit 202 | } 203 | 204 | # Entry point 205 | function main() { 206 | load_config 207 | parse_args "$@" 208 | 209 | (( FILE_MODE )) && run_file_mode 210 | 211 | get_kernels 212 | 213 | mkdir -p "${ESP_DIR}/${OUT_DIR}" 214 | process_kernels 215 | 216 | for f in "${EXTRA_SIGN[@]}"; do 217 | check_sign_extra_file "$f" 218 | done 219 | } 220 | 221 | if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then main "$@"; fi 222 | 223 | # vim:set ts=2 sw=2 et: 224 | -------------------------------------------------------------------------------- /sbupdate.conf: -------------------------------------------------------------------------------- 1 | # Configuration file for sbupdate 2 | # 3 | # Commented-out variables show default values. 4 | 5 | # Common settings 6 | # 7 | # KEY_DIR Directory with the custom Secure Boot keys 8 | # ESP_DIR EFI System Partition location 9 | # OUT_DIR Relative path on ESP for signed kernel images 10 | # SPLASH Splash image file. Use an empty string to disable splash. 11 | # BACKUP Whether to back up old signed kernel images 12 | # EXTRA_SIGN An array of additional files to sign 13 | # CMDLINE_DEFAULT Default kernel command line. Read from /etc/kernel/cmdline 14 | # if not set in the configuration file. 15 | 16 | #KEY_DIR="/etc/efi-keys" 17 | #ESP_DIR="/boot" 18 | #OUT_DIR="EFI/Arch" 19 | #SPLASH="/usr/share/systemd/bootctl/splash-arch.bmp" 20 | #BACKUP=1 21 | #EXTRA_SIGN=() 22 | #CMDLINE_DEFAULT="" 23 | 24 | # Per-kernel configuration 25 | # 26 | # For each kernel the following optional settings may be added: 27 | # 28 | # CMDLINE[]="..." # Alternative kernel command line 29 | # # Default value: ${CMDLINE_DEFAULT} 30 | # INITRD[]="..." # Alternative initramfs file 31 | # # Default value: /boot/initramfs-.img 32 | # OUTPUT[]="..." # Alternative output file name 33 | # # Default value: ${OUT_DIR}/-signed.efi 34 | # 35 | # Each kernel can be mapped to multiple configs using the CONFIGS 36 | # variable, in which case CMDLINE, INITRD and OUTPUT are set per config. 37 | # 38 | # Examples: 39 | # CMDLINE["linux-lts"]="custom command line" 40 | # INITRD["linux-lts"]="/boot/initramfs-linux-custom.img" 41 | # 42 | # # Generates variants with default and fallback initramfs 43 | # CONFIGS["linux"]="linux linux-fallback" 44 | # 45 | # Note: Intel and AMD microcode updates are handled automatically and 46 | # do not need to be specified in INITRD. 47 | --------------------------------------------------------------------------------