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#!/bin/bash
# Copyright (C) 2016 Paul Kocialkowski <contact@paulk.fr>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
KEYBLOCK="keyblock"
VBPRIVK="vbprivk"
VBPUBK="vbpubk"
usage() {
printf "$executable [action] [firmware image path]\n" >&2
printf "\nActions:\n" >&2
printf " sign - Sign firmware image\n" >&2
printf " verify - Verify firmware image\n" >&2
printf "\nEnvironment variables:\n" >&2
printf " VBOOT_KEYS_PATH - Path to the vboot keys\n" >&2
printf " VBOOT_TOOLS_PATH - Path to vboot tools\n" >&2
}
sign() {
local firmware_image_path=$1
futility sign --signprivate="$VBOOT_KEYS_PATH/firmware_data_key.$VBPRIVK" --keyblock "$VBOOT_KEYS_PATH/firmware.$KEYBLOCK" --kernelkey "$VBOOT_KEYS_PATH/kernel_subkey.$VBPUBK" --infile "$firmware_image_path"
futility gbb_utility -s --recoverykey="$VBOOT_KEYS_PATH/recovery_key.$VBPUBK" --rootkey="$VBOOT_KEYS_PATH/root_key.$VBPUBK" "$firmware_image_path" "$firmware_image_path"
printf "\nSigned firmwares image $firmware_image_path\n"
}
verify() {
local firmware_image_path=$1
futility verify -k "$VBOOT_KEYS_PATH/root_key.$VBPUBK" "$firmware_image_path" || ( printf "\nBad firmware image signature!\n" >&2 && return 1 )
printf "\nVerified firmware image $firmware_image_path\n"
}
requirements() {
local requirement
local requirement_path
for requirement in "$@"
do
requirement_path=$( which "$requirement" || true )
if [ -z "$requirement_path" ]
then
printf "Missing requirement: $requirement\n" >&2
exit 1
fi
done
}
setup() {
root=$( realpath "$( dirname "$0" )" )
executable=$( basename "$0" )
if ! [ -z "$VBOOT_TOOLS_PATH" ]
then
PATH="$PATH:$VBOOT_TOOLS_PATH"
fi
if [ -z "$VBOOT_KEYS_PATH" ]
then
if ! [ -z "$VBOOT_TOOLS_PATH" ] && [ -d "$VBOOT_TOOLS_PATH/devkeys" ]
then
VBOOT_KEYS_PATH="$VBOOT_TOOLS_PATH/devkeys"
else
VBOOT_KEYS_PATH="/usr/share/vboot/devkeys"
fi
fi
}
cros_firmware_prepare() {
local action=$1
local firmware_image_path=$2
set -e
setup "$@"
if [ -z "$action" ] || [ -z "$firmware_image_path" ]
then
usage
exit 1
fi
case $action in
"sign")
if ! [ -f "$firmware_image_path" ]
then
usage
exit 1
fi
requirements "futility"
sign "$firmware_image_path"
;;
"verify")
requirements "futility"
verify "$firmware_image_path"
;;
*)
usage
exit 1
;;
esac
}
cros_firmware_prepare "$@"
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