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# Copyright (c) 2018 Intel Corp Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
#
import hashlib
from io import BytesIO
import logging
import os
import os.path
import subprocess
import tempfile
import requests
import six
from six.moves.urllib import parse as urlparse
LOG = logging.getLogger(__name__)
def _hash_value_for_file(f, hash_function, block_size=2**20):
while True:
data = f.read(block_size)
if not data:
break
hash_function.update(data)
return hash_function.hexdigest()
def cal_file_hash(root, path, algo):
if algo == 'SHA-256':
algo = 'SHA256'
elif algo == 'SHA-512':
algo = 'SHA512'
h = hashlib.new(algo)
if urlparse.urlparse(path).scheme:
r = requests.get(path)
if r.status_code != 200:
raise ValueError('Server at {0} returned a {1} status code'
.format(path, r.status_code))
fp = BytesIO(r.content)
return _hash_value_for_file(fp, h)
else:
with open(os.path.join(root, path), 'rb') as fp:
return _hash_value_for_file(fp, h)
def _run_cmd(cmd, **kwargs):
if isinstance(cmd, list):
args = cmd
elif isinstance(cmd, string):
args = [cmd]
else:
raise RuntimeError("cmd must be string or list")
for key, value in six.iteritems(kwargs):
args.append(key)
if value:
args.append(value)
try:
LOG.debug("Executing %s", args)
return str(subprocess.check_output(args).decode('utf-8'))
except subprocess.CalledProcessError as e:
LOG.error("Executing %s failed with return code %d, output: %s",
e.cmd, e.returncode, e.output)
raise e
def sign(msg_file, cert_file, key_file):
args = ["openssl", "cms", "-sign", "-binary"]
kwargs = {
'-in': os.path.abspath(msg_file),
'-signer': os.path.abspath(cert_file),
'-inkey': os.path.abspath(key_file),
'-outform': 'PEM',
}
return _run_cmd(args, **kwargs)
def verify(msg_file, cert_file, cms, no_verify_cert=False):
args = ["openssl", "cms", "-verify", "-binary"]
if no_verify_cert:
args.append("-noverify")
with tempfile.NamedTemporaryFile(mode='w') as f:
f.write(cms)
f.flush()
kwargs = {
'-in': f.name,
'-inform': 'PEM',
'-content': os.path.abspath(msg_file),
'-certfile': os.path.abspath(cert_file),
}
return _run_cmd(args, **kwargs)
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