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https://github.com/brain-hackers/u-boot-brain
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041bca5ba3
Add a description of how to implement verified boot using signed FIT images, and a simple test which verifies operation on sandbox. The test signs a FIT image and verifies it, then signs a FIT configuration and verifies it. Then it corrupts the signature to check that this is detected. Signed-off-by: Simon Glass <sjg@chromium.org>
127 lines
3.2 KiB
Bash
Executable File
127 lines
3.2 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2013, Google Inc.
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#
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# Simple Verified Boot Test Script
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation; either version 2 of
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# the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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# MA 02111-1307 USA
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set -e
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# Run U-Boot and report the result
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# Args:
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# $1: Test message
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run_uboot() {
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echo -n "Test Verified Boot Run: $1: "
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${uboot} -d sandbox-u-boot.dtb >${tmp} -c '
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sb load host 0 100 test.fit;
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fdt addr 100;
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bootm 100;
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reset'
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if ! grep -q "$2" ${tmp}; then
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echo
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echo "Verified boot key check failed, output follows:"
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cat ${tmp}
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false
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else
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echo "OK"
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fi
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}
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echo "Simple Verified Boot Test"
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echo "========================="
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echo
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echo "Please see doc/uImage.FIT/verified-boot.txt for more information"
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echo
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err=0
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tmp=/tmp/vboot_test.$$
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dir=$(dirname $0)
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if [ -z ${O} ]; then
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O=.
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fi
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O=$(readlink -f ${O})
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dtc="-I dts -O dtb -p 2000"
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uboot="${O}/u-boot"
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mkimage="${O}/tools/mkimage"
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keys="${dir}/dev-keys"
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echo ${mkimage} -D "${dtc}"
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echo "Build keys"
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mkdir -p ${keys}
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# Create an RSA key pair
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openssl genrsa -F4 -out ${keys}/dev.key 2048 2>/dev/null
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# Create a certificate containing the public key
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openssl req -batch -new -x509 -key ${keys}/dev.key -out ${keys}/dev.crt
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pushd ${dir} >/dev/null
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# Compile our device tree files for kernel and U-Boot (CONFIG_OF_CONTROL)
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dtc -p 0x1000 sandbox-kernel.dts -O dtb -o sandbox-kernel.dtb
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dtc -p 0x1000 sandbox-u-boot.dts -O dtb -o sandbox-u-boot.dtb
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# Create a number kernel image with zeroes
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head -c 5000 /dev/zero >test-kernel.bin
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# Build the FIT, but don't sign anything yet
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echo Build FIT with signed images
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${mkimage} -D "${dtc}" -f sign-images.its test.fit >${tmp}
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run_uboot "unsigned signatures:" "dev-"
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# Sign images with our dev keys
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echo Sign images
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${mkimage} -D "${dtc}" -F -k dev-keys -K sandbox-u-boot.dtb -r test.fit >${tmp}
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run_uboot "signed images" "dev+"
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# Create a fresh .dtb without the public keys
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dtc -p 0x1000 sandbox-u-boot.dts -O dtb -o sandbox-u-boot.dtb
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echo Build FIT with signed configuration
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${mkimage} -D "${dtc}" -f sign-configs.its test.fit >${tmp}
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run_uboot "unsigned config" "sha1+ OK"
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# Sign images with our dev keys
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echo Sign images
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${mkimage} -D "${dtc}" -F -k dev-keys -K sandbox-u-boot.dtb -r test.fit >${tmp}
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run_uboot "signed config" "dev+"
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# Increment the first byte of the signature, which should cause failure
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sig=$(fdtget -t bx test.fit /configurations/conf@1/signature@1 value)
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newbyte=$(printf %x $((0x${sig:0:2} + 1)))
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sig="${newbyte} ${sig:2}"
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fdtput -t bx test.fit /configurations/conf@1/signature@1 value ${sig}
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run_uboot "signed config with bad hash" "Bad Data Hash"
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popd >/dev/null
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echo
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if ${ok}; then
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echo "Test passed"
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else
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echo "Test failed"
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fi
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