test/vboot/vboot_test.sh

#!/bin/sh
#
# Copyright (c) 2013, Google Inc.
#
# Simple Verified Boot Test Script
#
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA

set -e

# Run U-Boot and report the result
# Args:
#	$1:	Test message
run_uboot() {
	echo -n "Test Verified Boot Run: $1: "
	${uboot} -d sandbox-u-boot.dtb >${tmp} -c '
sb load host 0 100 test.fit;
fdt addr 100;
bootm 100;
reset'
	if ! grep -q "$2" ${tmp}; then
		echo
		echo "Verified boot key check failed, output follows:"
		cat ${tmp}
		false
	else
		echo "OK"
	fi
}

echo "Simple Verified Boot Test"
echo "========================="
echo
echo "Please see doc/uImage.FIT/verified-boot.txt for more information"
echo

err=0
tmp=/tmp/vboot_test.$$

dir=$(dirname $0)

if [ -z ${O} ]; then
	O=.
fi
O=$(readlink -f ${O})

dtc="-I dts -O dtb -p 2000"
uboot="${O}/u-boot"
mkimage="${O}/tools/mkimage"
keys="${dir}/dev-keys"
echo ${mkimage} -D "${dtc}"

echo "Build keys"
mkdir -p ${keys}

# Create an RSA key pair
openssl genrsa -F4 -out ${keys}/dev.key 2048 2>/dev/null

# Create a certificate containing the public key
openssl req -batch -new -x509 -key ${keys}/dev.key -out ${keys}/dev.crt

pushd ${dir} >/dev/null

# Compile our device tree files for kernel and U-Boot (CONFIG_OF_CONTROL)
dtc -p 0x1000 sandbox-kernel.dts -O dtb -o sandbox-kernel.dtb
dtc -p 0x1000 sandbox-u-boot.dts -O dtb -o sandbox-u-boot.dtb

# Create a number kernel image with zeroes
head -c 5000 /dev/zero >test-kernel.bin

# Build the FIT, but don't sign anything yet
echo Build FIT with signed images
${mkimage} -D "${dtc}" -f sign-images.its test.fit >${tmp}

run_uboot "unsigned signatures:" "dev-"

# Sign images with our dev keys
echo Sign images
${mkimage} -D "${dtc}" -F -k dev-keys -K sandbox-u-boot.dtb -r test.fit >${tmp}

run_uboot "signed images" "dev+"


# Create a fresh .dtb without the public keys
dtc -p 0x1000 sandbox-u-boot.dts -O dtb -o sandbox-u-boot.dtb

echo Build FIT with signed configuration
${mkimage} -D "${dtc}" -f sign-configs.its test.fit >${tmp}

run_uboot "unsigned config" "sha1+ OK"

# Sign images with our dev keys
echo Sign images
${mkimage} -D "${dtc}" -F -k dev-keys -K sandbox-u-boot.dtb -r test.fit >${tmp}

run_uboot "signed config" "dev+"

# Increment the first byte of the signature, which should cause failure
sig=$(fdtget -t bx test.fit /configurations/conf@1/signature@1 value)
newbyte=$(printf %x $((0x${sig:0:2} + 1)))
sig="${newbyte} ${sig:2}"
fdtput -t bx test.fit /configurations/conf@1/signature@1 value ${sig}

run_uboot "signed config with bad hash" "Bad Data Hash"

popd >/dev/null

echo
if ${ok}; then
	echo "Test passed"
else
	echo "Test failed"
fi