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https://github.com/smaeul/u-boot.git
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c7c113dc13
When doing a quick check we don't need to run all the vboot tests. Just run the first one, which is enough to catch most problems. Signed-off-by: Simon Glass <sjg@chromium.org>
534 lines
22 KiB
Python
534 lines
22 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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# Copyright (c) 2016, Google Inc.
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#
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# U-Boot Verified Boot Test
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"""
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This tests verified boot in the following ways:
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For image verification:
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- Create FIT (unsigned) with mkimage
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- Check that verification shows that no keys are verified
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- Sign image
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- Check that verification shows that a key is now verified
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For configuration verification:
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- Corrupt signature and check for failure
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- Create FIT (with unsigned configuration) with mkimage
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- Check that image verification works
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- Sign the FIT and mark the key as 'required' for verification
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- Check that image verification works
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- Corrupt the signature
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- Check that image verification no-longer works
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For pre-load header verification:
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- Create FIT image with a pre-load header
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- Check that signature verification succeeds
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- Corrupt the FIT image
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- Check that signature verification fails
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- Launch an FIT image without a pre-load header
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- Check that image verification fails
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Tests run with both SHA1 and SHA256 hashing.
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"""
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import os
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import shutil
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import struct
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import pytest
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import u_boot_utils as util
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import vboot_forge
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import vboot_evil
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# Only run the full suite on a few combinations, since it doesn't add any more
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# test coverage.
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TESTDATA_IN = [
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['sha1-basic', 'sha1', '', None, False, True, False, False],
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['sha1-pad', 'sha1', '', '-E -p 0x10000', False, False, False, False],
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['sha1-pss', 'sha1', '-pss', None, False, False, False, False],
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['sha1-pss-pad', 'sha1', '-pss', '-E -p 0x10000', False, False, False, False],
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['sha256-basic', 'sha256', '', None, False, False, False, False],
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['sha256-pad', 'sha256', '', '-E -p 0x10000', False, False, False, False],
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['sha256-pss', 'sha256', '-pss', None, False, False, False, False],
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['sha256-pss-pad', 'sha256', '-pss', '-E -p 0x10000', False, False, False, False],
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['sha256-pss-required', 'sha256', '-pss', None, True, False, False, False],
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['sha256-pss-pad-required', 'sha256', '-pss', '-E -p 0x10000', True, True, False, False],
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['sha384-basic', 'sha384', '', None, False, False, False, False],
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['sha384-pad', 'sha384', '', '-E -p 0x10000', False, False, False, False],
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['algo-arg', 'algo-arg', '', '-o sha256,rsa2048', False, False, True, False],
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['sha256-global-sign', 'sha256', '', '', False, False, False, True],
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['sha256-global-sign-pss', 'sha256', '-pss', '', False, False, False, True],
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]
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# Mark all but the first test as slow, so they are not run with '-k not slow'
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TESTDATA = [TESTDATA_IN[0]]
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TESTDATA += [pytest.param(*v, marks=pytest.mark.slow) for v in TESTDATA_IN[1:]]
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@pytest.mark.boardspec('sandbox')
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@pytest.mark.buildconfigspec('fit_signature')
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@pytest.mark.requiredtool('dtc')
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@pytest.mark.requiredtool('fdtget')
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@pytest.mark.requiredtool('fdtput')
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@pytest.mark.requiredtool('openssl')
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@pytest.mark.parametrize("name,sha_algo,padding,sign_options,required,full_test,algo_arg,global_sign",
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TESTDATA)
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def test_vboot(u_boot_console, name, sha_algo, padding, sign_options, required,
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full_test, algo_arg, global_sign):
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"""Test verified boot signing with mkimage and verification with 'bootm'.
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This works using sandbox only as it needs to update the device tree used
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by U-Boot to hold public keys from the signing process.
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The SHA1 and SHA256 tests are combined into a single test since the
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key-generation process is quite slow and we want to avoid doing it twice.
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"""
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def dtc(dts):
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"""Run the device tree compiler to compile a .dts file
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The output file will be the same as the input file but with a .dtb
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extension.
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Args:
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dts: Device tree file to compile.
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"""
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dtb = dts.replace('.dts', '.dtb')
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util.run_and_log(cons, 'dtc %s %s%s -O dtb '
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'-o %s%s' % (dtc_args, datadir, dts, tmpdir, dtb))
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def dtc_options(dts, options):
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"""Run the device tree compiler to compile a .dts file
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The output file will be the same as the input file but with a .dtb
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extension.
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Args:
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dts: Device tree file to compile.
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options: Options provided to the compiler.
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"""
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dtb = dts.replace('.dts', '.dtb')
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util.run_and_log(cons, 'dtc %s %s%s -O dtb '
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'-o %s%s %s' % (dtc_args, datadir, dts, tmpdir, dtb, options))
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def run_binman(dtb):
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"""Run binman to build an image
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Args:
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dtb: Device tree file used as input file.
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"""
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pythonpath = os.environ.get('PYTHONPATH', '')
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os.environ['PYTHONPATH'] = pythonpath + ':' + '%s/../scripts/dtc/pylibfdt' % tmpdir
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util.run_and_log(cons, [binman, 'build', '-d', "%s/%s" % (tmpdir,dtb),
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'-a', "pre-load-key-path=%s" % tmpdir, '-O',
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tmpdir, '-I', tmpdir])
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os.environ['PYTHONPATH'] = pythonpath
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def run_bootm(sha_algo, test_type, expect_string, boots, fit=None):
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"""Run a 'bootm' command U-Boot.
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This always starts a fresh U-Boot instance since the device tree may
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contain a new public key.
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Args:
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test_type: A string identifying the test type.
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expect_string: A string which is expected in the output.
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sha_algo: Either 'sha1' or 'sha256', to select the algorithm to
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use.
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boots: A boolean that is True if Linux should boot and False if
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we are expected to not boot
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fit: FIT filename to load and verify
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"""
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if not fit:
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fit = '%stest.fit' % tmpdir
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cons.restart_uboot()
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with cons.log.section('Verified boot %s %s' % (sha_algo, test_type)):
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output = cons.run_command_list(
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['host load hostfs - 100 %s' % fit,
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'fdt addr 100',
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'bootm 100'])
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assert expect_string in ''.join(output)
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if boots:
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assert 'sandbox: continuing, as we cannot run' in ''.join(output)
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else:
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assert('sandbox: continuing, as we cannot run'
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not in ''.join(output))
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def make_fit(its):
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"""Make a new FIT from the .its source file.
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This runs 'mkimage -f' to create a new FIT.
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Args:
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its: Filename containing .its source.
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"""
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util.run_and_log(cons, [mkimage, '-D', dtc_args, '-f',
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'%s%s' % (datadir, its), fit])
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def sign_fit(sha_algo, options):
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"""Sign the FIT
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Signs the FIT and writes the signature into it. It also writes the
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public key into the dtb.
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Args:
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sha_algo: Either 'sha1' or 'sha256', to select the algorithm to
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use.
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options: Options to provide to mkimage.
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"""
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args = [mkimage, '-F', '-k', tmpdir, '-K', dtb, '-r', fit]
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if options:
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args += options.split(' ')
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cons.log.action('%s: Sign images' % sha_algo)
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util.run_and_log(cons, args)
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def sign_fit_dtb(sha_algo, options, dtb):
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"""Sign the FIT
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Signs the FIT and writes the signature into it. It also writes the
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public key into the dtb.
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Args:
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sha_algo: Either 'sha1' or 'sha256', to select the algorithm to
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use.
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options: Options to provide to mkimage.
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"""
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args = [mkimage, '-F', '-k', tmpdir, '-K', dtb, '-r', fit]
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if options:
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args += options.split(' ')
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cons.log.action('%s: Sign images' % sha_algo)
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util.run_and_log(cons, args)
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def sign_fit_norequire(sha_algo, options):
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"""Sign the FIT
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Signs the FIT and writes the signature into it. It also writes the
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public key into the dtb. It does not mark key as 'required' in dtb.
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Args:
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sha_algo: Either 'sha1' or 'sha256', to select the algorithm to
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use.
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options: Options to provide to mkimage.
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"""
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args = [mkimage, '-F', '-k', tmpdir, '-K', dtb, fit]
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if options:
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args += options.split(' ')
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cons.log.action('%s: Sign images' % sha_algo)
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util.run_and_log(cons, args)
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def replace_fit_totalsize(size):
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"""Replace FIT header's totalsize with something greater.
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The totalsize must be less than or equal to FIT_SIGNATURE_MAX_SIZE.
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If the size is greater, the signature verification should return false.
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Args:
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size: The new totalsize of the header
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Returns:
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prev_size: The previous totalsize read from the header
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"""
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total_size = 0
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with open(fit, 'r+b') as handle:
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handle.seek(4)
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total_size = handle.read(4)
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handle.seek(4)
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handle.write(struct.pack(">I", size))
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return struct.unpack(">I", total_size)[0]
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def corrupt_file(fit, offset, value):
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"""Corrupt a file
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To corrupt a file, a value is written at the specified offset
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Args:
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fit: The file to corrupt
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offset: Offset to write
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value: Value written
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"""
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with open(fit, 'r+b') as handle:
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handle.seek(offset)
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handle.write(struct.pack(">I", value))
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def create_rsa_pair(name):
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"""Generate a new RSA key paid and certificate
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Args:
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name: Name of of the key (e.g. 'dev')
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"""
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public_exponent = 65537
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if sha_algo == "sha384":
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rsa_keygen_bits = 3072
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else:
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rsa_keygen_bits = 2048
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util.run_and_log(cons, 'openssl genpkey -algorithm RSA -out %s%s.key '
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'-pkeyopt rsa_keygen_bits:%d '
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'-pkeyopt rsa_keygen_pubexp:%d' %
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(tmpdir, name, rsa_keygen_bits, public_exponent))
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# Create a certificate containing the public key
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util.run_and_log(cons, 'openssl req -batch -new -x509 -key %s%s.key '
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'-out %s%s.crt' % (tmpdir, name, tmpdir, name))
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def test_with_algo(sha_algo, padding, sign_options):
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"""Test verified boot with the given hash algorithm.
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This is the main part of the test code. The same procedure is followed
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for both hashing algorithms.
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Args:
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sha_algo: Either 'sha1' or 'sha256', to select the algorithm to
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use.
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padding: Either '' or '-pss', to select the padding to use for the
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rsa signature algorithm.
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sign_options: Options to mkimage when signing a fit image.
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"""
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# Compile our device tree files for kernel and U-Boot. These are
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# regenerated here since mkimage will modify them (by adding a
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# public key) below.
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dtc('sandbox-kernel.dts')
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dtc('sandbox-u-boot.dts')
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# Build the FIT, but don't sign anything yet
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cons.log.action('%s: Test FIT with signed images' % sha_algo)
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make_fit('sign-images-%s%s.its' % (sha_algo, padding))
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run_bootm(sha_algo, 'unsigned images', ' - OK' if algo_arg else 'dev-', True)
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# Sign images with our dev keys
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sign_fit(sha_algo, sign_options)
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run_bootm(sha_algo, 'signed images', 'dev+', True)
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# Create a fresh .dtb without the public keys
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dtc('sandbox-u-boot.dts')
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cons.log.action('%s: Test FIT with signed configuration' % sha_algo)
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make_fit('sign-configs-%s%s.its' % (sha_algo, padding))
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run_bootm(sha_algo, 'unsigned config', '%s+ OK' % ('sha256' if algo_arg else sha_algo), True)
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# Sign images with our dev keys
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sign_fit(sha_algo, sign_options)
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run_bootm(sha_algo, 'signed config', 'dev+', True)
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cons.log.action('%s: Check signed config on the host' % sha_algo)
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util.run_and_log(cons, [fit_check_sign, '-f', fit, '-k', dtb])
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if full_test:
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# Make sure that U-Boot checks that the config is in the list of
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# hashed nodes. If it isn't, a security bypass is possible.
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ffit = '%stest.forged.fit' % tmpdir
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shutil.copyfile(fit, ffit)
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with open(ffit, 'rb') as fd:
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root, strblock = vboot_forge.read_fdt(fd)
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root, strblock = vboot_forge.manipulate(root, strblock)
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with open(ffit, 'w+b') as fd:
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vboot_forge.write_fdt(root, strblock, fd)
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util.run_and_log_expect_exception(
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cons, [fit_check_sign, '-f', ffit, '-k', dtb],
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1, 'Failed to verify required signature')
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run_bootm(sha_algo, 'forged config', 'Bad Data Hash', False, ffit)
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# Try adding an evil root node. This should be detected.
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efit = '%stest.evilf.fit' % tmpdir
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shutil.copyfile(fit, efit)
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vboot_evil.add_evil_node(fit, efit, evil_kernel, 'fakeroot')
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util.run_and_log_expect_exception(
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cons, [fit_check_sign, '-f', efit, '-k', dtb],
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1, 'Failed to verify required signature')
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run_bootm(sha_algo, 'evil fakeroot', 'Bad FIT kernel image format',
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False, efit)
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# Try adding an @ to the kernel node name. This should be detected.
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efit = '%stest.evilk.fit' % tmpdir
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shutil.copyfile(fit, efit)
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vboot_evil.add_evil_node(fit, efit, evil_kernel, 'kernel@')
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msg = 'Signature checking prevents use of unit addresses (@) in nodes'
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util.run_and_log_expect_exception(
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cons, [fit_check_sign, '-f', efit, '-k', dtb],
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1, msg)
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run_bootm(sha_algo, 'evil kernel@', msg, False, efit)
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# Create a new properly signed fit and replace header bytes
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make_fit('sign-configs-%s%s.its' % (sha_algo, padding))
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sign_fit(sha_algo, sign_options)
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bcfg = u_boot_console.config.buildconfig
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max_size = int(bcfg.get('config_fit_signature_max_size', 0x10000000), 0)
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existing_size = replace_fit_totalsize(max_size + 1)
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run_bootm(sha_algo, 'Signed config with bad hash', 'Bad Data Hash',
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False)
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cons.log.action('%s: Check overflowed FIT header totalsize' % sha_algo)
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# Replace with existing header bytes
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replace_fit_totalsize(existing_size)
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run_bootm(sha_algo, 'signed config', 'dev+', True)
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cons.log.action('%s: Check default FIT header totalsize' % sha_algo)
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# Increment the first byte of the signature, which should cause failure
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sig = util.run_and_log(cons, 'fdtget -t bx %s %s value' %
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(fit, sig_node))
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byte_list = sig.split()
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byte = int(byte_list[0], 16)
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byte_list[0] = '%x' % (byte + 1)
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sig = ' '.join(byte_list)
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util.run_and_log(cons, 'fdtput -t bx %s %s value %s' %
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(fit, sig_node, sig))
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run_bootm(sha_algo, 'Signed config with bad hash', 'Bad Data Hash',
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False)
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cons.log.action('%s: Check bad config on the host' % sha_algo)
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util.run_and_log_expect_exception(
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cons, [fit_check_sign, '-f', fit, '-k', dtb],
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1, 'Failed to verify required signature')
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def test_required_key(sha_algo, padding, sign_options):
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"""Test verified boot with the given hash algorithm.
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This function tests if U-Boot rejects an image when a required key isn't
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used to sign a FIT.
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Args:
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sha_algo: Either 'sha1' or 'sha256', to select the algorithm to use
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padding: Either '' or '-pss', to select the padding to use for the
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rsa signature algorithm.
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sign_options: Options to mkimage when signing a fit image.
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"""
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# Compile our device tree files for kernel and U-Boot. These are
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# regenerated here since mkimage will modify them (by adding a
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# public key) below.
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dtc('sandbox-kernel.dts')
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dtc('sandbox-u-boot.dts')
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cons.log.action('%s: Test FIT with configs images' % sha_algo)
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# Build the FIT with prod key (keys required) and sign it. This puts the
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# signature into sandbox-u-boot.dtb, marked 'required'
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make_fit('sign-configs-%s%s-prod.its' % (sha_algo, padding))
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sign_fit(sha_algo, sign_options)
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# Build the FIT with dev key (keys NOT required). This adds the
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# signature into sandbox-u-boot.dtb, NOT marked 'required'.
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make_fit('sign-configs-%s%s.its' % (sha_algo, padding))
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sign_fit_norequire(sha_algo, sign_options)
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# So now sandbox-u-boot.dtb two signatures, for the prod and dev keys.
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# Only the prod key is set as 'required'. But FIT we just built has
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# a dev signature only (sign_fit_norequire() overwrites the FIT).
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# Try to boot the FIT with dev key. This FIT should not be accepted by
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# U-Boot because the prod key is required.
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run_bootm(sha_algo, 'required key', '', False)
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# Build the FIT with dev key (keys required) and sign it. This puts the
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# signature into sandbox-u-boot.dtb, marked 'required'.
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make_fit('sign-configs-%s%s.its' % (sha_algo, padding))
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sign_fit(sha_algo, sign_options)
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# Set the required-mode policy to "any".
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# So now sandbox-u-boot.dtb two signatures, for the prod and dev keys.
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# Both the dev and prod key are set as 'required'. But FIT we just built has
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# a dev signature only (sign_fit() overwrites the FIT).
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# Try to boot the FIT with dev key. This FIT should be accepted by
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# U-Boot because the dev key is required and policy is "any" required key.
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util.run_and_log(cons, 'fdtput -t s %s /signature required-mode any' %
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(dtb))
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run_bootm(sha_algo, 'multi required key', 'dev+', True)
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# Set the required-mode policy to "all".
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|
# So now sandbox-u-boot.dtb two signatures, for the prod and dev keys.
|
|
# Both the dev and prod key are set as 'required'. But FIT we just built has
|
|
# a dev signature only (sign_fit() overwrites the FIT).
|
|
# Try to boot the FIT with dev key. This FIT should not be accepted by
|
|
# U-Boot because the prod key is required and policy is "all" required key
|
|
util.run_and_log(cons, 'fdtput -t s %s /signature required-mode all' %
|
|
(dtb))
|
|
run_bootm(sha_algo, 'multi required key', '', False)
|
|
|
|
def test_global_sign(sha_algo, padding, sign_options):
|
|
"""Test global image signature with the given hash algorithm and padding.
|
|
|
|
Args:
|
|
sha_algo: Either 'sha1' or 'sha256', to select the algorithm to use
|
|
padding: Either '' or '-pss', to select the padding to use for the
|
|
rsa signature algorithm.
|
|
"""
|
|
|
|
dtb = '%ssandbox-u-boot-global%s.dtb' % (tmpdir, padding)
|
|
cons.config.dtb = dtb
|
|
|
|
# Compile our device tree files for kernel and U-Boot. These are
|
|
# regenerated here since mkimage will modify them (by adding a
|
|
# public key) below.
|
|
dtc('sandbox-kernel.dts')
|
|
dtc_options('sandbox-u-boot-global%s.dts' % padding, '-p 1024')
|
|
|
|
# Build the FIT with dev key (keys NOT required). This adds the
|
|
# signature into sandbox-u-boot.dtb, NOT marked 'required'.
|
|
make_fit('simple-images.its')
|
|
sign_fit_dtb(sha_algo, '', dtb)
|
|
|
|
# Build the dtb for binman that define the pre-load header
|
|
# with the global sigature.
|
|
dtc('sandbox-binman%s.dts' % padding)
|
|
|
|
# Run binman to create the final image with the not signed fit
|
|
# and the pre-load header that contains the global signature.
|
|
run_binman('sandbox-binman%s.dtb' % padding)
|
|
|
|
# Check that the signature is correctly verified by u-boot
|
|
run_bootm(sha_algo, 'global image signature',
|
|
'signature check has succeed', True, "%ssandbox.img" % tmpdir)
|
|
|
|
# Corrupt the image (just one byte after the pre-load header)
|
|
corrupt_file("%ssandbox.img" % tmpdir, 4096, 255);
|
|
|
|
# Check that the signature verification fails
|
|
run_bootm(sha_algo, 'global image signature',
|
|
'signature check has failed', False, "%ssandbox.img" % tmpdir)
|
|
|
|
# Check that the boot fails if the global signature is not provided
|
|
run_bootm(sha_algo, 'global image signature', 'signature is mandatory', False)
|
|
|
|
cons = u_boot_console
|
|
tmpdir = os.path.join(cons.config.result_dir, name) + '/'
|
|
if not os.path.exists(tmpdir):
|
|
os.mkdir(tmpdir)
|
|
datadir = cons.config.source_dir + '/test/py/tests/vboot/'
|
|
fit = '%stest.fit' % tmpdir
|
|
mkimage = cons.config.build_dir + '/tools/mkimage'
|
|
binman = cons.config.source_dir + '/tools/binman/binman'
|
|
fit_check_sign = cons.config.build_dir + '/tools/fit_check_sign'
|
|
dtc_args = '-I dts -O dtb -i %s' % tmpdir
|
|
dtb = '%ssandbox-u-boot.dtb' % tmpdir
|
|
sig_node = '/configurations/conf-1/signature'
|
|
|
|
create_rsa_pair('dev')
|
|
create_rsa_pair('prod')
|
|
|
|
# Create a number kernel image with zeroes
|
|
with open('%stest-kernel.bin' % tmpdir, 'wb') as fd:
|
|
fd.write(500 * b'\0')
|
|
|
|
# Create a second kernel image with ones
|
|
evil_kernel = '%stest-kernel1.bin' % tmpdir
|
|
with open(evil_kernel, 'wb') as fd:
|
|
fd.write(500 * b'\x01')
|
|
|
|
try:
|
|
# We need to use our own device tree file. Remember to restore it
|
|
# afterwards.
|
|
old_dtb = cons.config.dtb
|
|
cons.config.dtb = dtb
|
|
if global_sign:
|
|
test_global_sign(sha_algo, padding, sign_options)
|
|
elif required:
|
|
test_required_key(sha_algo, padding, sign_options)
|
|
else:
|
|
test_with_algo(sha_algo, padding, sign_options)
|
|
finally:
|
|
# Go back to the original U-Boot with the correct dtb.
|
|
cons.config.dtb = old_dtb
|
|
cons.restart_uboot()
|