469 lines
16 KiB
Python
Executable file
469 lines
16 KiB
Python
Executable file
#!/usr/bin/env python3
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#
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# Copyright The Mbed TLS Contributors
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# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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"""Audit validity date of X509 crt/crl/csr.
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This script is used to audit the validity date of crt/crl/csr used for testing.
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It prints the information about X.509 objects excluding the objects that
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are valid throughout the desired validity period. The data are collected
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from tests/data_files/ and tests/suites/*.data files by default.
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"""
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import os
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import re
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import typing
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import argparse
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import datetime
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import glob
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import logging
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import hashlib
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from enum import Enum
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# The script requires cryptography >= 35.0.0 which is only available
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# for Python >= 3.6.
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import cryptography
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from cryptography import x509
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from generate_test_code import FileWrapper
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import scripts_path # pylint: disable=unused-import
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from mbedtls_dev import build_tree
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from mbedtls_dev import logging_util
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def check_cryptography_version():
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match = re.match(r'^[0-9]+', cryptography.__version__)
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if match is None or int(match.group(0)) < 35:
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raise Exception("audit-validity-dates requires cryptography >= 35.0.0"
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+ "({} is too old)".format(cryptography.__version__))
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class DataType(Enum):
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CRT = 1 # Certificate
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CRL = 2 # Certificate Revocation List
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CSR = 3 # Certificate Signing Request
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class DataFormat(Enum):
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PEM = 1 # Privacy-Enhanced Mail
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DER = 2 # Distinguished Encoding Rules
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class AuditData:
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"""Store data location, type and validity period of X.509 objects."""
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#pylint: disable=too-few-public-methods
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def __init__(self, data_type: DataType, x509_obj):
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self.data_type = data_type
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# the locations that the x509 object could be found
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self.locations = [] # type: typing.List[str]
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self.fill_validity_duration(x509_obj)
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self._obj = x509_obj
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encoding = cryptography.hazmat.primitives.serialization.Encoding.DER
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self._identifier = hashlib.sha1(self._obj.public_bytes(encoding)).hexdigest()
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@property
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def identifier(self):
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"""
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Identifier of the underlying X.509 object, which is consistent across
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different runs.
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"""
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return self._identifier
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def fill_validity_duration(self, x509_obj):
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"""Read validity period from an X.509 object."""
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# Certificate expires after "not_valid_after"
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# Certificate is invalid before "not_valid_before"
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if self.data_type == DataType.CRT:
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self.not_valid_after = x509_obj.not_valid_after
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self.not_valid_before = x509_obj.not_valid_before
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# CertificateRevocationList expires after "next_update"
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# CertificateRevocationList is invalid before "last_update"
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elif self.data_type == DataType.CRL:
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self.not_valid_after = x509_obj.next_update
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self.not_valid_before = x509_obj.last_update
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# CertificateSigningRequest is always valid.
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elif self.data_type == DataType.CSR:
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self.not_valid_after = datetime.datetime.max
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self.not_valid_before = datetime.datetime.min
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else:
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raise ValueError("Unsupported file_type: {}".format(self.data_type))
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class X509Parser:
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"""A parser class to parse crt/crl/csr file or data in PEM/DER format."""
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PEM_REGEX = br'-{5}BEGIN (?P<type>.*?)-{5}(?P<data>.*?)-{5}END (?P=type)-{5}'
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PEM_TAG_REGEX = br'-{5}BEGIN (?P<type>.*?)-{5}\n'
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PEM_TAGS = {
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DataType.CRT: 'CERTIFICATE',
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DataType.CRL: 'X509 CRL',
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DataType.CSR: 'CERTIFICATE REQUEST'
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}
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def __init__(self,
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backends:
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typing.Dict[DataType,
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typing.Dict[DataFormat,
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typing.Callable[[bytes], object]]]) \
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-> None:
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self.backends = backends
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self.__generate_parsers()
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def __generate_parser(self, data_type: DataType):
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"""Parser generator for a specific DataType"""
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tag = self.PEM_TAGS[data_type]
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pem_loader = self.backends[data_type][DataFormat.PEM]
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der_loader = self.backends[data_type][DataFormat.DER]
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def wrapper(data: bytes):
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pem_type = X509Parser.pem_data_type(data)
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# It is in PEM format with target tag
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if pem_type == tag:
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return pem_loader(data)
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# It is in PEM format without target tag
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if pem_type:
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return None
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# It might be in DER format
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try:
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result = der_loader(data)
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except ValueError:
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result = None
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return result
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wrapper.__name__ = "{}.parser[{}]".format(type(self).__name__, tag)
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return wrapper
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def __generate_parsers(self):
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"""Generate parsers for all support DataType"""
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self.parsers = {}
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for data_type, _ in self.PEM_TAGS.items():
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self.parsers[data_type] = self.__generate_parser(data_type)
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def __getitem__(self, item):
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return self.parsers[item]
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@staticmethod
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def pem_data_type(data: bytes) -> typing.Optional[str]:
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"""Get the tag from the data in PEM format
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:param data: data to be checked in binary mode.
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:return: PEM tag or "" when no tag detected.
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"""
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m = re.search(X509Parser.PEM_TAG_REGEX, data)
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if m is not None:
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return m.group('type').decode('UTF-8')
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else:
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return None
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@staticmethod
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def check_hex_string(hex_str: str) -> bool:
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"""Check if the hex string is possibly DER data."""
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hex_len = len(hex_str)
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# At least 6 hex char for 3 bytes: Type + Length + Content
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if hex_len < 6:
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return False
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# Check if Type (1 byte) is SEQUENCE.
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if hex_str[0:2] != '30':
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return False
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# Check LENGTH (1 byte) value
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content_len = int(hex_str[2:4], base=16)
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consumed = 4
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if content_len in (128, 255):
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# Indefinite or Reserved
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return False
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elif content_len > 127:
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# Definite, Long
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length_len = (content_len - 128) * 2
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content_len = int(hex_str[consumed:consumed+length_len], base=16)
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consumed += length_len
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# Check LENGTH
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if hex_len != content_len * 2 + consumed:
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return False
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return True
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class Auditor:
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"""
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A base class that uses X509Parser to parse files to a list of AuditData.
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A subclass must implement the following methods:
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- collect_default_files: Return a list of file names that are defaultly
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used for parsing (auditing). The list will be stored in
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Auditor.default_files.
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- parse_file: Method that parses a single file to a list of AuditData.
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A subclass may override the following methods:
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- parse_bytes: Defaultly, it parses `bytes` that contains only one valid
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X.509 data(DER/PEM format) to an X.509 object.
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- walk_all: Defaultly, it iterates over all the files in the provided
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file name list, calls `parse_file` for each file and stores the results
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by extending the `results` passed to the function.
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"""
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def __init__(self, logger):
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self.logger = logger
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self.default_files = self.collect_default_files()
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self.parser = X509Parser({
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DataType.CRT: {
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DataFormat.PEM: x509.load_pem_x509_certificate,
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DataFormat.DER: x509.load_der_x509_certificate
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},
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DataType.CRL: {
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DataFormat.PEM: x509.load_pem_x509_crl,
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DataFormat.DER: x509.load_der_x509_crl
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},
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DataType.CSR: {
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DataFormat.PEM: x509.load_pem_x509_csr,
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DataFormat.DER: x509.load_der_x509_csr
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},
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})
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def collect_default_files(self) -> typing.List[str]:
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"""Collect the default files for parsing."""
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raise NotImplementedError
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def parse_file(self, filename: str) -> typing.List[AuditData]:
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"""
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Parse a list of AuditData from file.
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:param filename: name of the file to parse.
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:return list of AuditData parsed from the file.
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"""
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raise NotImplementedError
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def parse_bytes(self, data: bytes):
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"""Parse AuditData from bytes."""
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for data_type in list(DataType):
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try:
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result = self.parser[data_type](data)
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except ValueError as val_error:
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result = None
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self.logger.warning(val_error)
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if result is not None:
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audit_data = AuditData(data_type, result)
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return audit_data
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return None
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def walk_all(self,
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results: typing.Dict[str, AuditData],
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file_list: typing.Optional[typing.List[str]] = None) \
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-> None:
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"""
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Iterate over all the files in the list and get audit data. The
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results will be written to `results` passed to this function.
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:param results: The dictionary used to store the parsed
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AuditData. The keys of this dictionary should
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be the identifier of the AuditData.
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"""
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if file_list is None:
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file_list = self.default_files
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for filename in file_list:
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data_list = self.parse_file(filename)
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for d in data_list:
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if d.identifier in results:
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results[d.identifier].locations.extend(d.locations)
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else:
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results[d.identifier] = d
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@staticmethod
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def find_test_dir():
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"""Get the relative path for the Mbed TLS test directory."""
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return os.path.relpath(build_tree.guess_mbedtls_root() + '/tests')
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class TestDataAuditor(Auditor):
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"""Class for auditing files in `tests/data_files/`"""
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def collect_default_files(self):
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"""Collect all files in `tests/data_files/`"""
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test_dir = self.find_test_dir()
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test_data_glob = os.path.join(test_dir, 'data_files/**')
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data_files = [f for f in glob.glob(test_data_glob, recursive=True)
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if os.path.isfile(f)]
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return data_files
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def parse_file(self, filename: str) -> typing.List[AuditData]:
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"""
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Parse a list of AuditData from data file.
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:param filename: name of the file to parse.
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:return list of AuditData parsed from the file.
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"""
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with open(filename, 'rb') as f:
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data = f.read()
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results = []
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# Try to parse all PEM blocks.
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is_pem = False
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for idx, m in enumerate(re.finditer(X509Parser.PEM_REGEX, data, flags=re.S), 1):
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is_pem = True
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result = self.parse_bytes(data[m.start():m.end()])
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if result is not None:
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result.locations.append("{}#{}".format(filename, idx))
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results.append(result)
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# Might be DER format.
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if not is_pem:
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result = self.parse_bytes(data)
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if result is not None:
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result.locations.append("{}".format(filename))
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results.append(result)
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return results
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def parse_suite_data(data_f):
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"""
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Parses .data file for test arguments that possiblly have a
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valid X.509 data. If you need a more precise parser, please
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use generate_test_code.parse_test_data instead.
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:param data_f: file object of the data file.
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:return: Generator that yields test function argument list.
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"""
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for line in data_f:
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line = line.strip()
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# Skip comments
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if line.startswith('#'):
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continue
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# Check parameters line
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match = re.search(r'\A\w+(.*:)?\"', line)
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if match:
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# Read test vectors
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parts = re.split(r'(?<!\\):', line)
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parts = [x for x in parts if x]
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args = parts[1:]
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yield args
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class SuiteDataAuditor(Auditor):
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"""Class for auditing files in `tests/suites/*.data`"""
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def collect_default_files(self):
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"""Collect all files in `tests/suites/*.data`"""
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test_dir = self.find_test_dir()
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suites_data_folder = os.path.join(test_dir, 'suites')
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data_files = glob.glob(os.path.join(suites_data_folder, '*.data'))
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return data_files
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def parse_file(self, filename: str):
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"""
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Parse a list of AuditData from test suite data file.
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:param filename: name of the file to parse.
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:return list of AuditData parsed from the file.
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"""
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audit_data_list = []
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data_f = FileWrapper(filename)
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for test_args in parse_suite_data(data_f):
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for idx, test_arg in enumerate(test_args):
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match = re.match(r'"(?P<data>[0-9a-fA-F]+)"', test_arg)
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if not match:
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continue
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if not X509Parser.check_hex_string(match.group('data')):
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continue
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audit_data = self.parse_bytes(bytes.fromhex(match.group('data')))
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if audit_data is None:
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continue
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audit_data.locations.append("{}:{}:#{}".format(filename,
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data_f.line_no,
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idx + 1))
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audit_data_list.append(audit_data)
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return audit_data_list
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def list_all(audit_data: AuditData):
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for loc in audit_data.locations:
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print("{}\t{:20}\t{:20}\t{:3}\t{}".format(
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audit_data.identifier,
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audit_data.not_valid_before.isoformat(timespec='seconds'),
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audit_data.not_valid_after.isoformat(timespec='seconds'),
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audit_data.data_type.name,
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loc))
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def main():
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"""
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Perform argument parsing.
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"""
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('-a', '--all',
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action='store_true',
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help='list the information of all the files')
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parser.add_argument('-v', '--verbose',
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action='store_true', dest='verbose',
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help='show logs')
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parser.add_argument('--from', dest='start_date',
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help=('Start of desired validity period (UTC, YYYY-MM-DD). '
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'Default: today'),
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metavar='DATE')
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parser.add_argument('--to', dest='end_date',
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help=('End of desired validity period (UTC, YYYY-MM-DD). '
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'Default: --from'),
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metavar='DATE')
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parser.add_argument('--data-files', action='append', nargs='*',
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help='data files to audit',
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metavar='FILE')
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parser.add_argument('--suite-data-files', action='append', nargs='*',
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help='suite data files to audit',
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metavar='FILE')
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args = parser.parse_args()
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# start main routine
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# setup logger
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logger = logging.getLogger()
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logging_util.configure_logger(logger)
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logger.setLevel(logging.DEBUG if args.verbose else logging.ERROR)
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td_auditor = TestDataAuditor(logger)
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sd_auditor = SuiteDataAuditor(logger)
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data_files = []
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suite_data_files = []
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if args.data_files is None and args.suite_data_files is None:
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data_files = td_auditor.default_files
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suite_data_files = sd_auditor.default_files
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else:
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if args.data_files is not None:
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data_files = [x for l in args.data_files for x in l]
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if args.suite_data_files is not None:
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suite_data_files = [x for l in args.suite_data_files for x in l]
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# validity period start date
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if args.start_date:
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start_date = datetime.datetime.fromisoformat(args.start_date)
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else:
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start_date = datetime.datetime.today()
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# validity period end date
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if args.end_date:
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end_date = datetime.datetime.fromisoformat(args.end_date)
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else:
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end_date = start_date
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# go through all the files
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audit_results = {}
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td_auditor.walk_all(audit_results, data_files)
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sd_auditor.walk_all(audit_results, suite_data_files)
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logger.info("Total: {} objects found!".format(len(audit_results)))
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# we filter out the files whose validity duration covers the provided
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# duration.
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filter_func = lambda d: (start_date < d.not_valid_before) or \
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(d.not_valid_after < end_date)
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sortby_end = lambda d: d.not_valid_after
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if args.all:
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filter_func = None
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# filter and output the results
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for d in sorted(filter(filter_func, audit_results.values()), key=sortby_end):
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list_all(d)
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logger.debug("Done!")
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check_cryptography_version()
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if __name__ == "__main__":
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main()
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