424 lines
14 KiB
Python
Executable file
424 lines
14 KiB
Python
Executable file
#!/usr/bin/env python3
|
|
#
|
|
# copyright the mbed tls contributors
|
|
# spdx-license-identifier: apache-2.0
|
|
#
|
|
# 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.
|
|
|
|
"""Audit validity date of X509 crt/crl/csr
|
|
|
|
This script is used to audit the validity date of crt/crl/csr used for testing.
|
|
The files are in tests/data_files/ while some data are in test suites data in
|
|
tests/suites/*.data files.
|
|
"""
|
|
|
|
import os
|
|
import sys
|
|
import re
|
|
import typing
|
|
import argparse
|
|
import datetime
|
|
import glob
|
|
from enum import Enum
|
|
|
|
from cryptography import x509
|
|
|
|
# reuse the function to parse *.data file in tests/suites/
|
|
from generate_test_code import parse_test_data as parse_suite_data
|
|
|
|
class DataType(Enum):
|
|
CRT = 1 # Certificate
|
|
CRL = 2 # Certificate Revocation List
|
|
CSR = 3 # Certificate Signing Request
|
|
|
|
class DataFormat(Enum):
|
|
PEM = 1 # Privacy-Enhanced Mail
|
|
DER = 2 # Distinguished Encoding Rules
|
|
|
|
class AuditData:
|
|
"""Store file, type and expiration date for audit."""
|
|
#pylint: disable=too-few-public-methods
|
|
def __init__(self, data_type: DataType):
|
|
self.data_type = data_type
|
|
self.filename = ""
|
|
self.not_valid_after: datetime.datetime
|
|
self.not_valid_before: datetime.datetime
|
|
|
|
def fill_validity_duration(self, x509_obj):
|
|
"""Fill expiration_date field from a x509 object"""
|
|
# Certificate expires after "not_valid_after"
|
|
# Certificate is invalid before "not_valid_before"
|
|
if self.data_type == DataType.CRT:
|
|
self.not_valid_after = x509_obj.not_valid_after
|
|
self.not_valid_before = x509_obj.not_valid_before
|
|
# CertificateRevocationList expires after "next_update"
|
|
# CertificateRevocationList is invalid before "last_update"
|
|
elif self.data_type == DataType.CRL:
|
|
self.not_valid_after = x509_obj.next_update
|
|
self.not_valid_before = x509_obj.last_update
|
|
# CertificateSigningRequest is always valid.
|
|
elif self.data_type == DataType.CSR:
|
|
self.not_valid_after = datetime.datetime.max
|
|
self.not_valid_before = datetime.datetime.min
|
|
else:
|
|
raise ValueError("Unsupported file_type: {}".format(self.data_type))
|
|
|
|
class X509Parser():
|
|
"""A parser class to parse crt/crl/csr file or data in PEM/DER format."""
|
|
PEM_REGEX = br'-{5}BEGIN (?P<type>.*?)-{5}\n(?P<data>.*?)-{5}END (?P=type)-{5}\n'
|
|
PEM_TAG_REGEX = br'-{5}BEGIN (?P<type>.*?)-{5}\n'
|
|
PEM_TAGS = {
|
|
DataType.CRT: 'CERTIFICATE',
|
|
DataType.CRL: 'X509 CRL',
|
|
DataType.CSR: 'CERTIFICATE REQUEST'
|
|
}
|
|
|
|
def __init__(self, backends: dict):
|
|
self.backends = backends
|
|
self.__generate_parsers()
|
|
|
|
def __generate_parser(self, data_type: DataType):
|
|
"""Parser generator for a specific DataType"""
|
|
tag = self.PEM_TAGS[data_type]
|
|
pem_loader = self.backends[data_type][DataFormat.PEM]
|
|
der_loader = self.backends[data_type][DataFormat.DER]
|
|
def wrapper(data: bytes):
|
|
pem_type = X509Parser.pem_data_type(data)
|
|
# It is in PEM format with target tag
|
|
if pem_type == tag:
|
|
return pem_loader(data)
|
|
# It is in PEM format without target tag
|
|
if pem_type:
|
|
return None
|
|
# It might be in DER format
|
|
try:
|
|
result = der_loader(data)
|
|
except ValueError:
|
|
result = None
|
|
return result
|
|
wrapper.__name__ = "{}.parser[{}]".format(type(self).__name__, tag)
|
|
return wrapper
|
|
|
|
def __generate_parsers(self):
|
|
"""Generate parsers for all support DataType"""
|
|
self.parsers = {}
|
|
for data_type, _ in self.PEM_TAGS.items():
|
|
self.parsers[data_type] = self.__generate_parser(data_type)
|
|
|
|
def __getitem__(self, item):
|
|
return self.parsers[item]
|
|
|
|
@staticmethod
|
|
def pem_data_type(data: bytes) -> str:
|
|
"""Get the tag from the data in PEM format
|
|
|
|
:param data: data to be checked in binary mode.
|
|
:return: PEM tag or "" when no tag detected.
|
|
"""
|
|
m = re.search(X509Parser.PEM_TAG_REGEX, data)
|
|
if m is not None:
|
|
return m.group('type').decode('UTF-8')
|
|
else:
|
|
return ""
|
|
|
|
@staticmethod
|
|
def check_hex_string(hex_str: str) -> bool:
|
|
"""Check if the hex string is possibly DER data."""
|
|
hex_len = len(hex_str)
|
|
# At least 6 hex char for 3 bytes: Type + Length + Content
|
|
if hex_len < 6:
|
|
return False
|
|
# Check if Type (1 byte) is SEQUENCE.
|
|
if hex_str[0:2] != '30':
|
|
return False
|
|
# Check LENGTH (1 byte) value
|
|
content_len = int(hex_str[2:4], base=16)
|
|
consumed = 4
|
|
if content_len in (128, 255):
|
|
# Indefinite or Reserved
|
|
return False
|
|
elif content_len > 127:
|
|
# Definite, Long
|
|
length_len = (content_len - 128) * 2
|
|
content_len = int(hex_str[consumed:consumed+length_len], base=16)
|
|
consumed += length_len
|
|
# Check LENGTH
|
|
if hex_len != content_len * 2 + consumed:
|
|
return False
|
|
return True
|
|
|
|
class Auditor:
|
|
"""A base class for audit."""
|
|
def __init__(self, verbose):
|
|
self.verbose = verbose
|
|
self.default_files = []
|
|
self.audit_data = []
|
|
self.parser = X509Parser({
|
|
DataType.CRT: {
|
|
DataFormat.PEM: x509.load_pem_x509_certificate,
|
|
DataFormat.DER: x509.load_der_x509_certificate
|
|
},
|
|
DataType.CRL: {
|
|
DataFormat.PEM: x509.load_pem_x509_crl,
|
|
DataFormat.DER: x509.load_der_x509_crl
|
|
},
|
|
DataType.CSR: {
|
|
DataFormat.PEM: x509.load_pem_x509_csr,
|
|
DataFormat.DER: x509.load_der_x509_csr
|
|
},
|
|
})
|
|
|
|
def error(self, *args):
|
|
#pylint: disable=no-self-use
|
|
print("Error: ", *args, file=sys.stderr)
|
|
|
|
def warn(self, *args):
|
|
if self.verbose:
|
|
print("Warn: ", *args, file=sys.stderr)
|
|
|
|
def parse_file(self, filename: str) -> typing.List[AuditData]:
|
|
"""
|
|
Parse a list of AuditData from file.
|
|
|
|
:param filename: name of the file to parse.
|
|
:return list of AuditData parsed from the file.
|
|
"""
|
|
with open(filename, 'rb') as f:
|
|
data = f.read()
|
|
result_list = []
|
|
result = self.parse_bytes(data)
|
|
if result is not None:
|
|
result.filename = filename
|
|
result_list.append(result)
|
|
return result_list
|
|
|
|
def parse_bytes(self, data: bytes):
|
|
"""Parse AuditData from bytes."""
|
|
for data_type in list(DataType):
|
|
try:
|
|
result = self.parser[data_type](data)
|
|
except ValueError as val_error:
|
|
result = None
|
|
self.warn(val_error)
|
|
if result is not None:
|
|
audit_data = AuditData(data_type)
|
|
audit_data.fill_validity_duration(result)
|
|
return audit_data
|
|
return None
|
|
|
|
def walk_all(self, file_list):
|
|
"""
|
|
Iterate over all the files in the list and get audit data.
|
|
"""
|
|
if not file_list:
|
|
file_list = self.default_files
|
|
for filename in file_list:
|
|
data_list = self.parse_file(filename)
|
|
self.audit_data.extend(data_list)
|
|
|
|
@staticmethod
|
|
def find_test_dir():
|
|
"""Get the relative path for the MbedTLS test directory."""
|
|
if os.path.isdir('tests'):
|
|
tests_dir = 'tests'
|
|
elif os.path.isdir('suites'):
|
|
tests_dir = '.'
|
|
elif os.path.isdir('../suites'):
|
|
tests_dir = '..'
|
|
else:
|
|
raise Exception("Mbed TLS source tree not found")
|
|
return tests_dir
|
|
|
|
class TestDataAuditor(Auditor):
|
|
"""Class for auditing files in tests/data_files/"""
|
|
def __init__(self, verbose):
|
|
super().__init__(verbose)
|
|
self.default_files = self.collect_default_files()
|
|
|
|
def collect_default_files(self):
|
|
"""Collect all files in tests/data_files/"""
|
|
test_dir = self.find_test_dir()
|
|
test_data_folder = os.path.join(test_dir, 'data_files')
|
|
data_files = []
|
|
for (dir_path, _, file_names) in os.walk(test_data_folder):
|
|
data_files.extend(os.path.join(dir_path, file_name)
|
|
for file_name in file_names)
|
|
return data_files
|
|
|
|
class FileWrapper():
|
|
"""
|
|
This a stub class of generate_test_code.FileWrapper.
|
|
|
|
This class reads the whole file to memory before iterating
|
|
over the lines.
|
|
"""
|
|
|
|
def __init__(self, file_name):
|
|
"""
|
|
Read the file and initialize the line number to 0.
|
|
|
|
:param file_name: File path to open.
|
|
"""
|
|
with open(file_name, 'rb') as f:
|
|
self.buf = f.read()
|
|
self.buf_len = len(self.buf)
|
|
self._line_no = 0
|
|
self._line_start = 0
|
|
|
|
def __iter__(self):
|
|
"""Make the class iterable."""
|
|
return self
|
|
|
|
def __next__(self):
|
|
"""
|
|
This method for returning a line of the file per iteration.
|
|
|
|
:return: Line read from file.
|
|
"""
|
|
# If we reach the end of the file.
|
|
if not self._line_start < self.buf_len:
|
|
raise StopIteration
|
|
|
|
line_end = self.buf.find(b'\n', self._line_start) + 1
|
|
if line_end > 0:
|
|
# Find the first LF as the end of the new line.
|
|
line = self.buf[self._line_start:line_end]
|
|
self._line_start = line_end
|
|
self._line_no += 1
|
|
else:
|
|
# No LF found. We are at the last line without LF.
|
|
line = self.buf[self._line_start:]
|
|
self._line_start = self.buf_len
|
|
self._line_no += 1
|
|
|
|
# Convert byte array to string with correct encoding and
|
|
# strip any whitespaces added in the decoding process.
|
|
return line.decode(sys.getdefaultencoding()).rstrip() + '\n'
|
|
|
|
def get_line_no(self):
|
|
"""
|
|
Gives current line number.
|
|
"""
|
|
return self._line_no
|
|
|
|
line_no = property(get_line_no)
|
|
|
|
class SuiteDataAuditor(Auditor):
|
|
"""Class for auditing files in tests/suites/*.data"""
|
|
def __init__(self, options):
|
|
super().__init__(options)
|
|
self.default_files = self.collect_default_files()
|
|
|
|
def collect_default_files(self):
|
|
"""Collect all files in tests/suites/*.data"""
|
|
test_dir = self.find_test_dir()
|
|
suites_data_folder = os.path.join(test_dir, 'suites')
|
|
data_files = glob.glob(os.path.join(suites_data_folder, '*.data'))
|
|
return data_files
|
|
|
|
def parse_file(self, filename: str):
|
|
"""
|
|
Parse a list of AuditData from file.
|
|
|
|
:param filename: name of the file to parse.
|
|
:return list of AuditData parsed from the file.
|
|
"""
|
|
audit_data_list = []
|
|
data_f = FileWrapper(filename)
|
|
for _, _, _, test_args in parse_suite_data(data_f):
|
|
for test_arg in test_args:
|
|
match = re.match(r'"(?P<data>[0-9a-fA-F]+)"', test_arg)
|
|
if not match:
|
|
continue
|
|
if not X509Parser.check_hex_string(match.group('data')):
|
|
continue
|
|
audit_data = self.parse_bytes(bytes.fromhex(match.group('data')))
|
|
if audit_data is None:
|
|
continue
|
|
audit_data.filename = filename
|
|
audit_data_list.append(audit_data)
|
|
|
|
return audit_data_list
|
|
|
|
def list_all(audit_data: AuditData):
|
|
print("{}\t{}\t{}\t{}".format(
|
|
audit_data.not_valid_before.isoformat(timespec='seconds'),
|
|
audit_data.not_valid_after.isoformat(timespec='seconds'),
|
|
audit_data.data_type.name,
|
|
audit_data.filename))
|
|
|
|
def main():
|
|
"""
|
|
Perform argument parsing.
|
|
"""
|
|
parser = argparse.ArgumentParser(
|
|
description='Audit script for X509 crt/crl/csr files.'
|
|
)
|
|
|
|
parser.add_argument('-a', '--all',
|
|
action='store_true',
|
|
help='list the information of all files')
|
|
parser.add_argument('-v', '--verbose',
|
|
action='store_true', dest='verbose',
|
|
help='Show warnings')
|
|
parser.add_argument('--not-before', dest='not_before',
|
|
help='not valid before this date(UTC), YYYY-MM-DD',
|
|
metavar='DATE')
|
|
parser.add_argument('--not-after', dest='not_after',
|
|
help='not valid after this date(UTC), YYYY-MM-DD',
|
|
metavar='DATE')
|
|
parser.add_argument('-f', '--file', dest='file',
|
|
help='file to audit (Debug only)',
|
|
metavar='FILE')
|
|
|
|
args = parser.parse_args()
|
|
|
|
# start main routine
|
|
td_auditor = TestDataAuditor(args.verbose)
|
|
sd_auditor = SuiteDataAuditor(args.verbose)
|
|
|
|
if args.file:
|
|
data_files = [args.file]
|
|
suite_data_files = [args.file]
|
|
else:
|
|
data_files = td_auditor.default_files
|
|
suite_data_files = sd_auditor.default_files
|
|
|
|
if args.not_before:
|
|
not_before_date = datetime.datetime.fromisoformat(args.not_before)
|
|
else:
|
|
not_before_date = datetime.datetime.today()
|
|
if args.not_after:
|
|
not_after_date = datetime.datetime.fromisoformat(args.not_after)
|
|
else:
|
|
not_after_date = not_before_date
|
|
|
|
td_auditor.walk_all(data_files)
|
|
sd_auditor.walk_all(suite_data_files)
|
|
audit_results = td_auditor.audit_data + sd_auditor.audit_data
|
|
|
|
# we filter out the files whose validity duration covers the provide
|
|
# duration.
|
|
filter_func = lambda d: (not_before_date < d.not_valid_before) or \
|
|
(d.not_valid_after < not_after_date)
|
|
|
|
if args.all:
|
|
filter_func = None
|
|
|
|
for d in filter(filter_func, audit_results):
|
|
list_all(d)
|
|
|
|
print("\nDone!\n")
|
|
|
|
if __name__ == "__main__":
|
|
main()
|