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commit bce5673f31e8050bf7a641b2f115da001f89f68a
parent 3ec878636b48c50f5d6e74ae03b23be080da2169
Author: Paul Kocialkowski <contact@paulk.fr>
Date:   Fri, 23 Dec 2016 18:19:56 +0100

cros-scripts: Introduce cros-boot-keys script to manage keys for CrOS devices

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

Diffstat:
projects/cros-scripts/install/cros-boot-keys | 203+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
projects/cros-scripts/install/install | 1+
2 files changed, 204 insertions(+), 0 deletions(-)

diff --git a/projects/cros-scripts/install/cros-boot-keys b/projects/cros-scripts/install/cros-boot-keys @@ -0,0 +1,203 @@ +#!/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" "$firmware_image_path" + fi + ;; + *) + usage + exit 1 + ;; + esac +} + +cros_boot_keys "$@" diff --git a/projects/cros-scripts/install/install b/projects/cros-scripts/install/install @@ -1,2 +1,3 @@ +cros-boot-keys:cros-boot-keys cros-kernel-prepare:cros-kernel-prepare cros-medium-setup:cros-medium-setup