X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=test%2Fpy%2Ftests%2Ftest_vboot.py;h=9c41ee56b151ce7e4afeae4918578ab9c22235ce;hb=d6b92b9742f125542dd0985976c3a6c560ed40fd;hp=25c3a53c97dc55f0394c7427956ec9ac230a1315;hpb=851271a71ada94d3ae52057c5cea465f4ba9f621;p=oweals%2Fu-boot.git diff --git a/test/py/tests/test_vboot.py b/test/py/tests/test_vboot.py index 25c3a53c97..9c41ee56b1 100644 --- a/test/py/tests/test_vboot.py +++ b/test/py/tests/test_vboot.py @@ -1,6 +1,5 @@ -# Copyright (c) 2016, Google Inc. -# # SPDX-License-Identifier: GPL-2.0+ +# Copyright (c) 2016, Google Inc. # # U-Boot Verified Boot Test @@ -27,10 +26,15 @@ Tests run with both SHA1 and SHA256 hashing. import pytest import sys +import struct import u_boot_utils as util @pytest.mark.boardspec('sandbox') @pytest.mark.buildconfigspec('fit_signature') +@pytest.mark.requiredtool('dtc') +@pytest.mark.requiredtool('fdtget') +@pytest.mark.requiredtool('fdtput') +@pytest.mark.requiredtool('openssl') def test_vboot(u_boot_console): """Test verified boot signing with mkimage and verification with 'bootm'. @@ -53,7 +57,7 @@ def test_vboot(u_boot_console): util.run_and_log(cons, 'dtc %s %s%s -O dtb ' '-o %s%s' % (dtc_args, datadir, dts, tmpdir, dtb)) - def run_bootm(sha_algo, test_type, expect_string): + def run_bootm(sha_algo, test_type, expect_string, boots): """Run a 'bootm' command U-Boot. This always starts a fresh U-Boot instance since the device tree may @@ -64,15 +68,20 @@ def test_vboot(u_boot_console): expect_string: A string which is expected in the output. sha_algo: Either 'sha1' or 'sha256', to select the algorithm to use. + boots: A boolean that is True if Linux should boot and False if + we are expected to not boot """ - cons.cleanup_spawn() - cons.ensure_spawned() + cons.restart_uboot() with cons.log.section('Verified boot %s %s' % (sha_algo, test_type)): output = cons.run_command_list( - ['sb load hostfs - 100 %stest.fit' % tmpdir, + ['host load hostfs - 100 %stest.fit' % tmpdir, 'fdt addr 100', 'bootm 100']) - assert(expect_string in output) + assert(expect_string in ''.join(output)) + if boots: + assert('sandbox: continuing, as we cannot run' in ''.join(output)) + else: + assert('sandbox: continuing, as we cannot run' not in ''.join(output)) def make_fit(its): """Make a new FIT from the .its source file. @@ -99,7 +108,41 @@ def test_vboot(u_boot_console): util.run_and_log(cons, [mkimage, '-F', '-k', tmpdir, '-K', dtb, '-r', fit]) - def test_with_algo(sha_algo): + def sign_fit_norequire(sha_algo): + """Sign the FIT + + Signs the FIT and writes the signature into it. It also writes the + public key into the dtb. + + Args: + sha_algo: Either 'sha1' or 'sha256', to select the algorithm to + use. + """ + cons.log.action('%s: Sign images' % sha_algo) + util.run_and_log(cons, [mkimage, '-F', '-k', tmpdir, '-K', dtb, + fit]) + + def replace_fit_totalsize(size): + """Replace FIT header's totalsize with something greater. + + The totalsize must be less than or equal to FIT_SIGNATURE_MAX_SIZE. + If the size is greater, the signature verification should return false. + + Args: + size: The new totalsize of the header + + Returns: + prev_size: The previous totalsize read from the header + """ + total_size = 0 + with open(fit, 'r+b') as handle: + handle.seek(4) + total_size = handle.read(4) + handle.seek(4) + handle.write(struct.pack(">I", size)) + return struct.unpack(">I", total_size)[0] + + def test_with_algo(sha_algo, padding): """Test verified boot with the given hash algorithm. This is the main part of the test code. The same procedure is followed @@ -117,29 +160,41 @@ def test_vboot(u_boot_console): # Build the FIT, but don't sign anything yet cons.log.action('%s: Test FIT with signed images' % sha_algo) - make_fit('sign-images-%s.its' % sha_algo) - run_bootm(sha_algo, 'unsigned images', 'dev-') + make_fit('sign-images-%s%s.its' % (sha_algo , padding)) + run_bootm(sha_algo, 'unsigned images', 'dev-', True) # Sign images with our dev keys sign_fit(sha_algo) - run_bootm(sha_algo, 'signed images', 'dev+') + run_bootm(sha_algo, 'signed images', 'dev+', True) # Create a fresh .dtb without the public keys dtc('sandbox-u-boot.dts') cons.log.action('%s: Test FIT with signed configuration' % sha_algo) - make_fit('sign-configs-%s.its' % sha_algo) - run_bootm(sha_algo, 'unsigned config', '%s+ OK' % sha_algo) + make_fit('sign-configs-%s%s.its' % (sha_algo , padding)) + run_bootm(sha_algo, 'unsigned config', '%s+ OK' % sha_algo, True) # Sign images with our dev keys sign_fit(sha_algo) - run_bootm(sha_algo, 'signed config', 'dev+') + run_bootm(sha_algo, 'signed config', 'dev+', True) cons.log.action('%s: Check signed config on the host' % sha_algo) util.run_and_log(cons, [fit_check_sign, '-f', fit, '-k', tmpdir, '-k', dtb]) + # Replace header bytes + bcfg = u_boot_console.config.buildconfig + max_size = int(bcfg.get('config_fit_signature_max_size', 0x10000000), 0) + existing_size = replace_fit_totalsize(max_size + 1) + run_bootm(sha_algo, 'Signed config with bad hash', 'Bad Data Hash', False) + cons.log.action('%s: Check overflowed FIT header totalsize' % sha_algo) + + # Replace with existing header bytes + replace_fit_totalsize(existing_size) + run_bootm(sha_algo, 'signed config', 'dev+', True) + cons.log.action('%s: Check default FIT header totalsize' % sha_algo) + # Increment the first byte of the signature, which should cause failure sig = util.run_and_log(cons, 'fdtget -t bx %s %s value' % (fit, sig_node)) @@ -150,12 +205,41 @@ def test_vboot(u_boot_console): util.run_and_log(cons, 'fdtput -t bx %s %s value %s' % (fit, sig_node, sig)) - run_bootm(sha_algo, 'Signed config with bad hash', 'Bad Data Hash') + run_bootm(sha_algo, 'Signed config with bad hash', 'Bad Data Hash', False) cons.log.action('%s: Check bad config on the host' % sha_algo) util.run_and_log_expect_exception(cons, [fit_check_sign, '-f', fit, '-k', dtb], 1, 'Failed to verify required signature') + def test_required_key(sha_algo, padding): + """Test verified boot with the given hash algorithm. + + This function test if u-boot reject an image when a required + key isn't used to sign a FIT. + + Args: + sha_algo: Either 'sha1' or 'sha256', to select the algorithm to + use. + """ + # 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('sandbox-u-boot.dts') + + # Build the FIT with prod key (keys required) + # Build the FIT with dev key (keys NOT required) + # The dtb contain the key prod and dev and the key prod are set as required. + # Then try to boot the FIT with dev key + # This FIT should not be accepted by u-boot because the key prod is required + cons.log.action('%s: Test FIT with configs images' % sha_algo) + make_fit('sign-configs-%s%s-prod.its' % (sha_algo , padding)) + sign_fit(sha_algo) + make_fit('sign-configs-%s%s.its' % (sha_algo , padding)) + sign_fit(sha_algo) + + run_bootm(sha_algo, 'signed configs', '', False) + cons = u_boot_console tmpdir = cons.config.result_dir + '/' tmp = tmpdir + 'vboot.tmp' @@ -165,19 +249,30 @@ def test_vboot(u_boot_console): 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@1' + sig_node = '/configurations/conf-1/signature' # Create an RSA key pair public_exponent = 65537 util.run_and_log(cons, 'openssl genpkey -algorithm RSA -out %sdev.key ' '-pkeyopt rsa_keygen_bits:2048 ' - '-pkeyopt rsa_keygen_pubexp:%d ' - '2>/dev/null' % (tmpdir, public_exponent)) + '-pkeyopt rsa_keygen_pubexp:%d' % + (tmpdir, public_exponent)) # Create a certificate containing the public key util.run_and_log(cons, 'openssl req -batch -new -x509 -key %sdev.key -out ' '%sdev.crt' % (tmpdir, tmpdir)) + # Create an RSA key pair (prod) + public_exponent = 65537 + util.run_and_log(cons, 'openssl genpkey -algorithm RSA -out %sprod.key ' + '-pkeyopt rsa_keygen_bits:2048 ' + '-pkeyopt rsa_keygen_pubexp:%d' % + (tmpdir, public_exponent)) + + # Create a certificate containing the public key (prod) + util.run_and_log(cons, 'openssl req -batch -new -x509 -key %sprod.key -out ' + '%sprod.crt' % (tmpdir, tmpdir)) + # Create a number kernel image with zeroes with open('%stest-kernel.bin' % tmpdir, 'w') as fd: fd.write(5000 * chr(0)) @@ -187,7 +282,12 @@ def test_vboot(u_boot_console): # afterwards. old_dtb = cons.config.dtb cons.config.dtb = dtb - test_with_algo('sha1') - test_with_algo('sha256') + test_with_algo('sha1','') + test_with_algo('sha1','-pss') + test_with_algo('sha256','') + test_with_algo('sha256','-pss') + test_required_key('sha256','-pss') finally: + # Go back to the original U-Boot with the correct dtb. cons.config.dtb = old_dtb + cons.restart_uboot()