def test_GetPayloadMetadataOffsetAndSize(self):
target_file = construct_target_files()
payload = Payload()
payload.Generate(target_file)
payload_signer = PayloadSigner()
payload.Sign(payload_signer)
output_file = common.MakeTempFile(suffix='.zip')
with zipfile.ZipFile(output_file, 'w') as output_zip:
payload.WriteToZip(output_zip)
# Find out the payload metadata offset and size.
property_files = AbOtaPropertyFiles()
with zipfile.ZipFile(output_file) as input_zip:
# pylint: disable=protected-access
payload_offset, metadata_total = (
property_files._GetPayloadMetadataOffsetAndSize(input_zip))
# Read in the metadata signature directly.
with open(output_file, 'rb') as verify_fp:
verify_fp.seek(payload_offset + metadata_total - self.SIGNATURE_SIZE)
metadata_signature = verify_fp.read(self.SIGNATURE_SIZE)
# Now we extract the metadata hash via brillo_update_payload script, which
# will serve as the oracle result.
payload_sig_file = common.MakeTempFile(prefix="sig-", suffix=".bin")
metadata_sig_file = common.MakeTempFile(prefix="sig-", suffix=".bin")
cmd = ['brillo_update_payload', 'hash',
'--unsigned_payload', payload.payload_file,
'--signature_size', str(self.SIGNATURE_SIZE),
'--metadata_hash_file', metadata_sig_file,
'--payload_hash_file', payload_sig_file]
proc = common.Run(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdoutdata, _ = proc.communicate()
self.assertEqual(
0, proc.returncode,
'Failed to run brillo_update_payload: {}'.format(stdoutdata))
signed_metadata_sig_file = payload_signer.Sign(metadata_sig_file)
# Finally we can compare the two signatures.
with open(signed_metadata_sig_file, 'rb') as verify_fp:
self.assertEqual(verify_fp.read(), metadata_signature)
def test_GetPayloadMetadataOffsetAndSize(self):
target_file = construct_target_files()
payload = Payload()
payload.Generate(target_file)
payload_signer = PayloadSigner()
payload.Sign(payload_signer)
output_file = common.MakeTempFile(suffix='.zip')
with zipfile.ZipFile(output_file, 'w') as output_zip:
payload.WriteToZip(output_zip)
# Find out the payload metadata offset and size.
property_files = AbOtaPropertyFiles()
with zipfile.ZipFile(output_file) as input_zip:
# pylint: disable=protected-access
payload_offset, metadata_total = (
property_files._GetPayloadMetadataOffsetAndSize(input_zip))
# Read in the metadata signature directly.
with open(output_file, 'rb') as verify_fp:
verify_fp.seek(payload_offset + metadata_total - self.SIGNATURE_SIZE)
metadata_signature = verify_fp.read(self.SIGNATURE_SIZE)
# Now we extract the metadata hash via brillo_update_payload script, which
# will serve as the oracle result.
payload_sig_file = common.MakeTempFile(prefix="sig-", suffix=".bin")
metadata_sig_file = common.MakeTempFile(prefix="sig-", suffix=".bin")
cmd = ['brillo_update_payload', 'hash',
'--unsigned_payload', payload.payload_file,
'--signature_size', str(self.SIGNATURE_SIZE),
'--metadata_hash_file', metadata_sig_file,
'--payload_hash_file', payload_sig_file]
proc = common.Run(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
stdoutdata, _ = proc.communicate()
self.assertEqual(
0, proc.returncode,
'Failed to run brillo_update_payload: {}'.format(stdoutdata))
signed_metadata_sig_file = payload_signer.Sign(metadata_sig_file)
# Finally we can compare the two signatures.
with open(signed_metadata_sig_file, 'rb') as verify_fp:
self.assertEqual(verify_fp.read(), metadata_signature)
def test_GetPayloadMetadataOffsetAndSize(self):
target_file = construct_target_files()
payload = Payload()
payload.Generate(target_file)
payload_signer = PayloadSigner()
payload.Sign(payload_signer)
output_file = common.MakeTempFile(suffix='.zip')
with zipfile.ZipFile(output_file, 'w') as output_zip:
payload.WriteToZip(output_zip)
# Find out the payload metadata offset and size.
property_files = AbOtaPropertyFiles()
with zipfile.ZipFile(output_file) as input_zip:
# pylint: disable=protected-access
payload_offset, metadata_total = (
property_files._GetPayloadMetadataOffsetAndSize(input_zip))
# The signature proto has the following format (details in
# /platform/system/update_engine/update_metadata.proto):
# message Signature {
# optional uint32 version = 1;
# optional bytes data = 2;
# optional fixed32 unpadded_signature_size = 3;
# }
#
# According to the protobuf encoding, the tail of the signature message will
# be [signature string(256 bytes) + encoding of the fixed32 number 256]. And
# 256 is encoded as 'x1d\x00\x01\x00\x00':
# [3 (field number) << 3 | 5 (type) + byte reverse of 0x100 (256)].
# Details in (https://developers.google.com/protocol-buffers/docs/encoding)
signature_tail_length = self.SIGNATURE_SIZE + 5
self.assertGreater(metadata_total, signature_tail_length)
with open(output_file, 'rb') as verify_fp:
verify_fp.seek(payload_offset + metadata_total - signature_tail_length)
metadata_signature_proto_tail = verify_fp.read(signature_tail_length)
self.assertEqual(b'\x1d\x00\x01\x00\x00',
metadata_signature_proto_tail[-5:])
metadata_signature = metadata_signature_proto_tail[:-5]
# Now we extract the metadata hash via brillo_update_payload script, which
# will serve as the oracle result.
payload_sig_file = common.MakeTempFile(prefix="sig-", suffix=".bin")
metadata_sig_file = common.MakeTempFile(prefix="sig-", suffix=".bin")
cmd = ['brillo_update_payload', 'hash',
'--unsigned_payload', payload.payload_file,
'--signature_size', str(self.SIGNATURE_SIZE),
'--metadata_hash_file', metadata_sig_file,
'--payload_hash_file', payload_sig_file]
proc = common.Run(cmd)
stdoutdata, _ = proc.communicate()
self.assertEqual(
0, proc.returncode,
'Failed to run brillo_update_payload:\n{}'.format(stdoutdata))
signed_metadata_sig_file = payload_signer.Sign(metadata_sig_file)
# Finally we can compare the two signatures.
with open(signed_metadata_sig_file, 'rb') as verify_fp:
self.assertEqual(verify_fp.read(), metadata_signature)