openmamba/desktop-base-openmamba
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sb-setup: add script for secure boot setup

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This commit is contained in:
Silvan Calarco 2024-11-01 20:22:28 +01:00
parent f708397560
commit d57c8817b1
2 changed files with 86 additions and 1 deletions
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6
Makefile
View File

@ -1,5 +1,5 @@
# Makefile for desktop-base-openmamba package
# Copyright (C) 2004-2022 by Silvan Calarco <silvan.calarco@mambasoft.it>
# Copyright (C) 2004-2024 by Silvan Calarco <silvan.calarco@mambasoft.it>
# Copyright (C) 2005-2007 by Davide Madrisan <davide.madrisan@gmail.com>
include VERSION
@ -119,6 +119,9 @@ install-kde-distro-addons: dist-update
install-os-makereport:
$(INSTALL_SCRIPT) os-makereport/os-makereport $(DESTDIR)$(bindir)
install-sb-setup:
$(INSTALL_SCRIPT) sb-setup/sb-setup $(DESTDIR)$(bindir)
install-desktop:
@$(INSTALL_DIR) $(DESTDIR)$(distrodesktopdir)
$(INSTALL_DATA) $(pck_desktop) $(DESTDIR)$(distrodesktopdir)
@ -133,6 +136,7 @@ install: $(pck_infiles:.in=) \
install-desktop \
install-openmamba-update \
install-os-makereport \
install-sb-setup \
install-locales
dist: clean

81
sb-setup/sb-setup Executable file
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@ -0,0 +1,81 @@
#!/bin/bash
#
# openmamba secure boot setup script
#
# Copyright (c) 2024 by Silvan Calarco <silvan.calarco@mambasoft.it>
# Released under the terms of the GNU GPL License v3
# Requires: sbsigntools shim-signed efibootmgr
# Sample chroot mount:
# sudo mount -o bind /dev /mnt/sda2/dev
# sudo mount -o bind /sys /mnt/sda2/sys
# sudo mount -o bind /proc /mnt/sda2/proc
# sudo mount -o bind /run /mnt/sda2/run
# sudo mount -o bind /mnt/sda1 /mnt/sda2/boot/efi
# sudo mount -o bind /sys/firmware/efi/efivars /mnt/sda2/sys/firmware/efi/efivars/
SECUREBOOT_ENABLED=`xxd -p -l4 -s1 /sys/firmware/efi/efivars/SecureBoot-* 2>/dev/null`
QUIET=
[ "$1" = "-q" ] && QUIET=1
[ "$QUIET" ] || echo "Secure boot setup script for openmamba"
[ "$SECUREBOOT_ENABLED" == "00000001" ] || {
[ "$QUIET" ] || echo "Secure Boot is not enabled; exiting."
exit 0
}
EFIDIR=/boot/efi/
EFILABEL="openmamba"
CERTDIR="/var/lib/sb-setup/mok"
BOOTDEV=`findmnt -fno SOURCE /boot/efi`
# Setup MAchine Owner Key folder
[ -e ${CERTDIR} ] || mkdir -p ${CERTDIR}
# Sign EFI image for secure boot
[ -e ${CERTDIR}/MOK.cer ] || {
[ "$QUIET" ] || echo "Creating Machine Owner Key and certificates"
openssl req -newkey rsa:2048 -nodes -keyout ${CERTDIR}/MOK.key -new -x509 -sha256 \
-days 3650 -subj "/CN=${EFILABEL} Machine Owner Key/" -out ${CERTDIR}/MOK.crt
openssl x509 -outform DER -in ${CERTDIR}/MOK.crt -out ${CERTDIR}/MOK.cer
}
#grub-mkimage -o ${EFIDIR}/grubx64.efi -O x86_64-efi -p /boot/grub \
[ "$QUIET" ] || echo "Create EFI grub image"
grub-install --target=x86_64-efi --efi-directory=${EFIDIR} --bootloader-id="${EFILABEL}" \
--sbat /usr/share/grub/sbat.csv --recheck \
--modules="all_video bli boot chain configfile cpuid echo efifwsetup efi_gop efi_uga efinet ext2 \
fat font gettext gfxmenu gfxterm gfxterm gfxterm_background gzio halt help hfsplus \
iso9660 jpeg keystatus linux loadenv loopback ls lsefi lsefimmap lsefisystab lssal \
memdisk minicmd normal ntfs ntfscomp part_apple part_gpt part_msdos password_pbkdf2 \
play png probe reboot regexp search search_fs_file search_fs_uuid search_label sleep \
smbios squash4 test tpm true video video_bochs video_cirrus xfs zfs zfscrypt zfsinfo"
[ "$QUIET" ] || echo "Signing EFI grub image for Secure Boot"
sbsign --key ${CERTDIR}/MOK.key --cert ${CERTDIR}/MOK.crt --output ${EFIDIR}/EFI/${EFILABEL}/grubx64.efi ${EFIDIR}//EFI/${EFILABEL}/grubx64.efi
for k in /boot/vmlinuz-*; do
echo "Signing $k for Secure Boot"
# Remove a previous signature if present
sbattach --remove ${k} 2>/dev/null
sbsign --key ${CERTDIR}/MOK.key --cert ${CERTDIR}/MOK.crt --output ${k} ${k}
done
[ "$QUIET" ] || echo "Copying MOK.cer into ${EFIDIR}/EFI/${EFILABEL}/"
cp ${CERTDIR}/MOK.cer ${EFIDIR}/EFI/${EFILABEL}/
# Install shim-signed
[ "$QUIET" ] || echo "Installing shim images on ${EFIDIR}/EFI/${EFILABEL}"
cp /usr/share/shim-signed/shimx64.efi ${EFIDIR}/EFI/${EFILABEL}/
cp /usr/share/shim-signed/mmx64.efi ${EFIDIR}/EFI/${EFILABEL}/
# Create EFI bootmanager entry for shimx64
[ "$QUIET" ] || echo "Configuring /EFI/${EFILABEL}/shimx64.efi for boot"
efibootmgr -q -c -d ${BOOTDEV} -L "${EFILABEL}" -l "/EFI/${EFILABEL}/shimx64.efi"
[ "$QUIET" ] || echo "Done."