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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/>.
REGEXP="\([^[:space:]]*\)[[:space:]]\(.*\)"
KEYBLOCK="keyblock"
VBPRIVK="vbprivk"
VBPUBK="vbpubk"
KEYB="keyb"
PEM="pem"
CRT="crt"
KEYS="ec_root_key ec_data_key root_key firmware_data_key kernel_subkey kernel_data_key recovery_key recovery_kernel_data_key installer_kernel_data_key"
KEYBLOCKS="firmware ec recovery_kernel kernel installer_kernel"
SUBKEYS="firmware_data_key root_key ec_data_key ec_root_key recovery_kernel_data_key recovery_key kernel_data_key kernel_subkey installer_kernel_data_key recovery_key"
ALGORITHMS="7 7 11 7 7 4 11 11 11"
MODES="7 7 11 7 10"
usage() {
printf "$executable [action] [keys directory] (firmware image path)\n" >&2
printf "\nActions:\n" >&2
printf " generate - Generate a set of keys\n" >&2
printf " sign - Sign a firmware image\n" >&2
printf " verify - Verify keyblocks\n" >&2
printf "\nOutput files:\n" >&2
printf " sign - Generates a firmware images with the \"-signed\" suffix\n" >&2
printf "\nEnvironment variables:\n" >&2
printf " KEYS_VERSION - Version to give the keys\n" >&2
printf " VBOOT_TOOLS_PATH - Path to vboot tools\n" >&2
}
generate() {
local keys_directory=$1
local algorithms=$ALGORITHMS
local subkeys=$SUBKEYS
local modes=$MODES
local keyblock
local algorithm
local pubkey
local privkey
local mode
for key in $KEYS
do
algorithm=$( echo "$algorithms" | sed "s/$REGEXP/\1/g" )
algorithms=$( echo "$algorithms" | sed "s/$REGEXP/\2/g" )
key_length=$(( 1 << (10 + ($algorithm / 3)) ))
openssl genrsa -F4 -out "$keys_directory/$key.$PEM" "$keys_directory/$key_length"
openssl req -batch -new -x509 -key "$keys_directory/$key.$PEM"
openssl req -batch -new -x509 -key "$keys_directory/$key.$PEM" -out "$key.$CRT"
dumpRSAPublicKey -cert "$keys_directory/$key.$CRT" > "$keys_directory/$key.$KEYB"
futility vbutil_key --pack "$keys_directory/$key.$VBPUBK" --key "$keys_directory/$key.$KEYB" --version "$KEYS_VERSION" --algorithm "$algorithm"
futility vbutil_key --pack "$keys_directory/$key.$VBPRIVK" --key "$keys_directory/$key.$PEM" --algorithm "$algorithm"
rm -f "$keys_directory/$key.$PEM" "$keys_directory/$key.$CRT" "$keys_directory/$key.$KEYB"
done
for keyblock in $KEYBLOCKS
do
pubkey=$( echo "$subkeys" | sed "s/$REGEXP/\1/g" )
subkeys=$( echo "$subkeys" | sed "s/$REGEXP/\2/g" )
privkey=$( echo "$subkeys" | sed "s/$REGEXP/\1/g" )
subkeys=$( echo "$subkeys" | sed "s/$REGEXP/\2/g" )
mode=$( echo "$modes" | sed "s/$REGEXP/\1/g" )
modes=$( echo "$modes" | sed "s/$REGEXP/\2/g" )
futility vbutil_keyblock --pack "$keys_directory/$keyblock.$KEYBLOCK" --flags "$mode" --datapubkey "$keys_directory/$pubkey.$VBPUBK" --signprivate "$keys_directory/$privkey.$VBPRIVK"
futility vbutil_keyblock --unpack "$keys_directory/$keyblock.$KEYBLOCK" --signpubkey "$keys_directory/$privkey.$VBPUBK"
done
}
sign() {
local keys_directory=$1
local firmware_image_path=$2
futility sign --signprivate="$keys_directory/firmware_data_key.$VBPRIVK" --keyblock "$keys_directory/firmware.$KEYBLOCK" --kernelkey "$keys_directory/kernel_subkey.$VBPUBK" -v "$KEYS_VERSION" --infile "$firmware_image_path"
futility gbb_utility -s --recoverykey="$keys_directory/recovery_key.$VBPUBK" --rootkey="$keys_directory/root_key.$VBPUBK" "$firmware_image_path" "$firmware_image_path"
}
verify() {
local keys_directory=$1
local subkeys=$SUBKEYS
local pubkey
local privkey
for keyblock in $KEYBLOCKS
do
pubkey=$( echo "$subkeys" | sed "s/$REGEXP/\1/g" )
subkeys=$( echo "$subkeys" | sed "s/$REGEXP/\2/g" )
privkey=$( echo "$subkeys" | sed "s/$REGEXP/\1/g" )
subkeys=$( echo "$subkeys" | sed "s/$REGEXP/\2/g" )
futility vbutil_keyblock --unpack "$keys_directory/$keyblock.$KEYBLOCK" --signpubkey "$keys_directory/$privkey.$VBPUBK"
done
}
verify_firmware() {
local keys_directory=$1
local firmware_image_path=$2
futility verify -k "$keys_directory/root_key.$VBPUBK" --type bios "$firmware_image_path" || printf "\nBad firmware image signature!\n" >&2 && return 1
}
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 "$0" )
if [ -z "$KEYS_VERSION" ]
then
KEYS_VERSION=1
fi
if ! [ -z "$VBOOT_TOOLS_PATH" ]
then
PATH="$PATH:$VBOOT_TOOLS_PATH"
fi
}
cros_boot_keys() {
local action=$1
local keys_directory=$2
local firmware_image_path=$3
set -e
setup "$@"
if [ -z "$action" ] || ! [ -d "$keys_directory" ]
then
usage
exit 1
fi
case $action in
"generate")
requirements "openssl" "dumpRSAPublicKey" "futility"
generate "$keys_directory"
;;
"sign")
if ! [ -f "$firmware_image_path" ]
then
usage
exit 1
fi
requirements "futility"
sign "$keys_directory" "$firmware_image_path"
;;
"verify")
requirements "futility"
verify "$keys_directory"
if [ -f "$firmware_image_path" ]
then
verify_firmware "$keys_directory" "$firmware_image_path"
fi
;;
*)
usage
exit 1
;;
esac
}
cros_boot_keys "$@"
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