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#!/usr/bin/env 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 1>&2 '%s\n' "$executable [action]"
printf 1>&2 '\n%s\n' 'Actions:'
printf 1>&2 '%s\n' ' generate - Generate a set of keys'
printf 1>&2 '%s\n' ' verify - Verify keyblocks'
printf 1>&2 '\n%s\n' 'Environment variables:'
printf 1>&2 '%s\n' ' KEYS_VERSION - Version to give the keys'
printf 1>&2 '%s\n' ' VBOOT_KEYS_PATH - Path to the vboot keys'
printf 1>&2 '%s\n' ' VBOOT_TOOLS_PATH - Path to vboot tools'
}
keys_override_confirm() {
local override=0
local confirm
for key in $KEYS
do
if [ -f "$VBOOT_KEYS_PATH/$key.$VBPUBK" ] || [ -f "$VBOOT_KEYS_PATH/$key.$VBPRIVK" ]
then
override=1
fi
done
for keyblock in $KEYBLOCKS
do
if [ -f "$VBOOT_KEYS_PATH/$keyblock.$KEYBLOCK" ]
then
override=1
fi
done
if [ $override -ne 1 ]
then
return 0
fi
printf '%s\n' 'This is going to override keys stored in the following directory:'
printf '%s\n' " $VBOOT_KEYS_PATH"
printf '%s' 'Press enter to confirm: '
read confirm
}
generate() {
local algorithms=$ALGORITHMS
local subkeys=$SUBKEYS
local modes=$MODES
local keyblock
local algorithm
local pubkey
local privkey
local mode
keys_override_confirm
for key in $KEYS
do
algorithm=$( printf '%s\n' "$algorithms" | sed "s/$REGEXP/\1/g" )
algorithms=$( printf '%s\n' "$algorithms" | sed "s/$REGEXP/\2/g" )
key_length=$(( 1 << (10 + ($algorithm / 3)) ))
openssl genrsa -F4 -out "$VBOOT_KEYS_PATH/$key.$PEM" "$key_length"
openssl req -batch -new -x509 -key "$VBOOT_KEYS_PATH/$key.$PEM"
openssl req -batch -new -x509 -key "$VBOOT_KEYS_PATH/$key.$PEM" -out "$VBOOT_KEYS_PATH/$key.$CRT"
dumpRSAPublicKey -cert "$VBOOT_KEYS_PATH/$key.$CRT" > "$VBOOT_KEYS_PATH/$key.$KEYB"
futility vbutil_key --pack "$VBOOT_KEYS_PATH/$key.$VBPUBK" --key "$VBOOT_KEYS_PATH/$key.$KEYB" --version "$KEYS_VERSION" --algorithm "$algorithm"
futility vbutil_key --pack "$VBOOT_KEYS_PATH/$key.$VBPRIVK" --key "$VBOOT_KEYS_PATH/$key.$PEM" --algorithm "$algorithm"
rm -f "$VBOOT_KEYS_PATH/$key.$PEM" "$VBOOT_KEYS_PATH/$key.$CRT" "$VBOOT_KEYS_PATH/$key.$KEYB"
done
printf '\n%s\n' "Generated keys $KEYS"
for keyblock in $KEYBLOCKS
do
pubkey=$( printf '%s\n' "$subkeys" | sed "s/$REGEXP/\1/g" )
subkeys=$( printf '%s\n' "$subkeys" | sed "s/$REGEXP/\2/g" )
privkey=$( printf '%s\n' "$subkeys" | sed "s/$REGEXP/\1/g" )
subkeys=$( printf '%s\n' "$subkeys" | sed "s/$REGEXP/\2/g" )
mode=$( printf '%s\n' "$modes" | sed "s/$REGEXP/\1/g" )
modes=$( printf '%s\n' "$modes" | sed "s/$REGEXP/\2/g" )
futility vbutil_keyblock --pack "$VBOOT_KEYS_PATH/$keyblock.$KEYBLOCK" --flags "$mode" --datapubkey "$VBOOT_KEYS_PATH/$pubkey.$VBPUBK" --signprivate "$VBOOT_KEYS_PATH/$privkey.$VBPRIVK"
futility vbutil_keyblock --unpack "$VBOOT_KEYS_PATH/$keyblock.$KEYBLOCK" --signpubkey "$VBOOT_KEYS_PATH/$privkey.$VBPUBK"
done
printf '\n%s\n' "Generated keyblocks $KEYBLOCKS"
}
verify() {
local subkeys=$SUBKEYS
local pubkey
local privkey
for keyblock in $KEYBLOCKS
do
pubkey=$( printf '%s\n' "$subkeys" | sed "s/$REGEXP/\1/g" )
subkeys=$( printf '%s\n' "$subkeys" | sed "s/$REGEXP/\2/g" )
privkey=$( printf '%s\n' "$subkeys" | sed "s/$REGEXP/\1/g" )
subkeys=$( printf '%s\n' "$subkeys" | sed "s/$REGEXP/\2/g" )
futility vbutil_keyblock --unpack "$VBOOT_KEYS_PATH/$keyblock.$KEYBLOCK" --signpubkey "$VBOOT_KEYS_PATH/$privkey.$VBPUBK"
done
printf '\n%s\n' "Verified keyblocks $KEYBLOCKS"
}
requirements() {
local requirement
local requirement_path
for requirement in "$@"
do
requirement_path=$( which "$requirement" || true )
if [ -z "$requirement_path" ]
then
printf 1>&2 '%s\n' "Missing requirement: $requirement"
exit 1
fi
done
}
setup() {
root=$(readlink -f "$( dirname "$0" )" )
executable=$( basename "$0" )
if [ -z "$KEYS_VERSION" ]
then
KEYS_VERSION=1
fi
if ! [ -z "$VBOOT_TOOLS_PATH" ]
then
PATH="$PATH:$VBOOT_TOOLS_PATH"
fi
if [ -z "$VBOOT_KEYS_PATH" ]
then
VBOOT_KEYS_PATH="$root/keys"
mkdir -p "$VBOOT_KEYS_PATH"
fi
}
cros_boot_keys() {
local action=$1
set -e
setup "$@"
if [ -z "$action" ]
then
usage
exit 1
fi
case $action in
"generate")
requirements "openssl" "dumpRSAPublicKey" "futility"
generate
;;
"verify")
requirements "futility"
verify
;;
*)
usage
exit 1
;;
esac
}
cros_boot_keys "$@"
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