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eb7bdaa177
Test keys with various persistence levels, enumerated from the metadata tests. For read-only keys, do not attempt to create or destroy the key through the API, only to read a key that has been injected into storage directly through filesystem access. Do not test keys with a non-default location, since they require a driver and we do not yet have a dependency mechanism to require the presence of a driver for a specific location value. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
510 lines
22 KiB
Python
Executable File
510 lines
22 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Generate test data for PSA cryptographic mechanisms.
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With no arguments, generate all test data. With non-option arguments,
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generate only the specified files.
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"""
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# Copyright The Mbed TLS Contributors
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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import os
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import posixpath
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import re
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import sys
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from typing import Callable, Dict, FrozenSet, Iterable, Iterator, List, Optional, TypeVar
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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 crypto_knowledge
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from mbedtls_dev import macro_collector
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from mbedtls_dev import psa_storage
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from mbedtls_dev import test_case
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T = TypeVar('T') #pylint: disable=invalid-name
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def psa_want_symbol(name: str) -> str:
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"""Return the PSA_WANT_xxx symbol associated with a PSA crypto feature."""
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if name.startswith('PSA_'):
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return name[:4] + 'WANT_' + name[4:]
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else:
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raise ValueError('Unable to determine the PSA_WANT_ symbol for ' + name)
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def finish_family_dependency(dep: str, bits: int) -> str:
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"""Finish dep if it's a family dependency symbol prefix.
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A family dependency symbol prefix is a PSA_WANT_ symbol that needs to be
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qualified by the key size. If dep is such a symbol, finish it by adjusting
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the prefix and appending the key size. Other symbols are left unchanged.
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"""
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return re.sub(r'_FAMILY_(.*)', r'_\1_' + str(bits), dep)
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def finish_family_dependencies(dependencies: List[str], bits: int) -> List[str]:
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"""Finish any family dependency symbol prefixes.
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Apply `finish_family_dependency` to each element of `dependencies`.
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"""
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return [finish_family_dependency(dep, bits) for dep in dependencies]
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SYMBOLS_WITHOUT_DEPENDENCY = frozenset([
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'PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG', # modifier, only in policies
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'PSA_ALG_AEAD_WITH_SHORTENED_TAG', # modifier
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'PSA_ALG_ANY_HASH', # only in policies
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'PSA_ALG_AT_LEAST_THIS_LENGTH_MAC', # modifier, only in policies
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'PSA_ALG_KEY_AGREEMENT', # chaining
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'PSA_ALG_TRUNCATED_MAC', # modifier
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])
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def automatic_dependencies(*expressions: str) -> List[str]:
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"""Infer dependencies of a test case by looking for PSA_xxx symbols.
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The arguments are strings which should be C expressions. Do not use
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string literals or comments as this function is not smart enough to
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skip them.
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"""
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used = set()
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for expr in expressions:
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used.update(re.findall(r'PSA_(?:ALG|ECC_FAMILY|KEY_TYPE)_\w+', expr))
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used.difference_update(SYMBOLS_WITHOUT_DEPENDENCY)
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return sorted(psa_want_symbol(name) for name in used)
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# A temporary hack: at the time of writing, not all dependency symbols
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# are implemented yet. Skip test cases for which the dependency symbols are
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# not available. Once all dependency symbols are available, this hack must
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# be removed so that a bug in the dependency symbols proprely leads to a test
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# failure.
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def read_implemented_dependencies(filename: str) -> FrozenSet[str]:
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return frozenset(symbol
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for line in open(filename)
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for symbol in re.findall(r'\bPSA_WANT_\w+\b', line))
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_implemented_dependencies = None #type: Optional[FrozenSet[str]] #pylint: disable=invalid-name
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def hack_dependencies_not_implemented(dependencies: List[str]) -> None:
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global _implemented_dependencies #pylint: disable=global-statement,invalid-name
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if _implemented_dependencies is None:
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_implemented_dependencies = \
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read_implemented_dependencies('include/psa/crypto_config.h')
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if not all(dep.lstrip('!') in _implemented_dependencies
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for dep in dependencies):
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dependencies.append('DEPENDENCY_NOT_IMPLEMENTED_YET')
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class Information:
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"""Gather information about PSA constructors."""
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def __init__(self) -> None:
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self.constructors = self.read_psa_interface()
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@staticmethod
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def remove_unwanted_macros(
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constructors: macro_collector.PSAMacroEnumerator
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) -> None:
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# Mbed TLS doesn't support finite-field DH yet and will not support
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# finite-field DSA. Don't attempt to generate any related test case.
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constructors.key_types.discard('PSA_KEY_TYPE_DH_KEY_PAIR')
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constructors.key_types.discard('PSA_KEY_TYPE_DH_PUBLIC_KEY')
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constructors.key_types.discard('PSA_KEY_TYPE_DSA_KEY_PAIR')
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constructors.key_types.discard('PSA_KEY_TYPE_DSA_PUBLIC_KEY')
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def read_psa_interface(self) -> macro_collector.PSAMacroEnumerator:
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"""Return the list of known key types, algorithms, etc."""
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constructors = macro_collector.InputsForTest()
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header_file_names = ['include/psa/crypto_values.h',
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'include/psa/crypto_extra.h']
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test_suites = ['tests/suites/test_suite_psa_crypto_metadata.data']
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for header_file_name in header_file_names:
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constructors.parse_header(header_file_name)
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for test_cases in test_suites:
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constructors.parse_test_cases(test_cases)
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self.remove_unwanted_macros(constructors)
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constructors.gather_arguments()
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return constructors
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def test_case_for_key_type_not_supported(
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verb: str, key_type: str, bits: int,
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dependencies: List[str],
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*args: str,
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param_descr: str = ''
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) -> test_case.TestCase:
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"""Return one test case exercising a key creation method
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for an unsupported key type or size.
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"""
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hack_dependencies_not_implemented(dependencies)
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tc = test_case.TestCase()
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short_key_type = re.sub(r'PSA_(KEY_TYPE|ECC_FAMILY)_', r'', key_type)
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adverb = 'not' if dependencies else 'never'
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if param_descr:
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adverb = param_descr + ' ' + adverb
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tc.set_description('PSA {} {} {}-bit {} supported'
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.format(verb, short_key_type, bits, adverb))
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tc.set_dependencies(dependencies)
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tc.set_function(verb + '_not_supported')
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tc.set_arguments([key_type] + list(args))
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return tc
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class NotSupported:
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"""Generate test cases for when something is not supported."""
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def __init__(self, info: Information) -> None:
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self.constructors = info.constructors
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ALWAYS_SUPPORTED = frozenset([
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'PSA_KEY_TYPE_DERIVE',
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'PSA_KEY_TYPE_RAW_DATA',
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])
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def test_cases_for_key_type_not_supported(
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self,
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kt: crypto_knowledge.KeyType,
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param: Optional[int] = None,
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param_descr: str = '',
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) -> Iterator[test_case.TestCase]:
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"""Return test cases exercising key creation when the given type is unsupported.
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If param is present and not None, emit test cases conditioned on this
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parameter not being supported. If it is absent or None, emit test cases
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conditioned on the base type not being supported.
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"""
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if kt.name in self.ALWAYS_SUPPORTED:
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# Don't generate test cases for key types that are always supported.
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# They would be skipped in all configurations, which is noise.
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return
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import_dependencies = [('!' if param is None else '') +
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psa_want_symbol(kt.name)]
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if kt.params is not None:
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import_dependencies += [('!' if param == i else '') +
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psa_want_symbol(sym)
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for i, sym in enumerate(kt.params)]
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if kt.name.endswith('_PUBLIC_KEY'):
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generate_dependencies = []
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else:
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generate_dependencies = import_dependencies
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for bits in kt.sizes_to_test():
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yield test_case_for_key_type_not_supported(
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'import', kt.expression, bits,
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finish_family_dependencies(import_dependencies, bits),
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test_case.hex_string(kt.key_material(bits)),
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param_descr=param_descr,
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)
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if not generate_dependencies and param is not None:
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# If generation is impossible for this key type, rather than
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# supported or not depending on implementation capabilities,
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# only generate the test case once.
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continue
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yield test_case_for_key_type_not_supported(
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'generate', kt.expression, bits,
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finish_family_dependencies(generate_dependencies, bits),
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str(bits),
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param_descr=param_descr,
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)
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# To be added: derive
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ECC_KEY_TYPES = ('PSA_KEY_TYPE_ECC_KEY_PAIR',
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'PSA_KEY_TYPE_ECC_PUBLIC_KEY')
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def test_cases_for_not_supported(self) -> Iterator[test_case.TestCase]:
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"""Generate test cases that exercise the creation of keys of unsupported types."""
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for key_type in sorted(self.constructors.key_types):
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if key_type in self.ECC_KEY_TYPES:
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continue
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kt = crypto_knowledge.KeyType(key_type)
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yield from self.test_cases_for_key_type_not_supported(kt)
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for curve_family in sorted(self.constructors.ecc_curves):
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for constr in self.ECC_KEY_TYPES:
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kt = crypto_knowledge.KeyType(constr, [curve_family])
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yield from self.test_cases_for_key_type_not_supported(
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kt, param_descr='type')
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yield from self.test_cases_for_key_type_not_supported(
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kt, 0, param_descr='curve')
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class StorageKey(psa_storage.Key):
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"""Representation of a key for storage format testing."""
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def __init__(self, *, description: str, **kwargs) -> None:
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super().__init__(**kwargs)
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self.description = description #type: str
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class StorageFormat:
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"""Storage format stability test cases."""
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def __init__(self, info: Information, version: int, forward: bool) -> None:
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"""Prepare to generate test cases for storage format stability.
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* `info`: information about the API. See the `Information` class.
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* `version`: the storage format version to generate test cases for.
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* `forward`: if true, generate forward compatibility test cases which
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save a key and check that its representation is as intended. Otherwise
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generate backward compatibility test cases which inject a key
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representation and check that it can be read and used.
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"""
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self.constructors = info.constructors
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self.version = version
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self.forward = forward
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def make_test_case(self, key: StorageKey) -> test_case.TestCase:
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"""Construct a storage format test case for the given key.
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If ``forward`` is true, generate a forward compatibility test case:
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create a key and validate that it has the expected representation.
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Otherwise generate a backward compatibility test case: inject the
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key representation into storage and validate that it can be read
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correctly.
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"""
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verb = 'save' if self.forward else 'read'
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tc = test_case.TestCase()
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tc.set_description('PSA storage {}: {}'.format(verb, key.description))
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dependencies = automatic_dependencies(
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key.lifetime.string, key.type.string,
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key.usage.string, key.alg.string, key.alg2.string,
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)
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dependencies = finish_family_dependencies(dependencies, key.bits)
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tc.set_dependencies(dependencies)
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tc.set_function('key_storage_' + verb)
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if self.forward:
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extra_arguments = []
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else:
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flags = []
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# Some test keys have the RAW_DATA type and attributes that don't
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# necessarily make sense. We do this to validate numerical
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# encodings of the attributes.
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# Raw data keys have no useful exercise anyway so there is no
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# loss of test coverage.
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if key.type.string != 'PSA_KEY_TYPE_RAW_DATA':
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flags.append('TEST_FLAG_EXERCISE')
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if 'READ_ONLY' in key.lifetime.string:
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flags.append('TEST_FLAG_READ_ONLY')
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extra_arguments = [' | '.join(flags) if flags else '0']
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tc.set_arguments([key.lifetime.string,
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key.type.string, str(key.bits),
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key.usage.string, key.alg.string, key.alg2.string,
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'"' + key.material.hex() + '"',
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'"' + key.hex() + '"',
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*extra_arguments])
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return tc
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def key_for_lifetime(
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self,
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lifetime: str,
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) -> StorageKey:
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"""Construct a test key for the given lifetime."""
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short = lifetime
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short = re.sub(r'PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION',
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r'', short)
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short = re.sub(r'PSA_KEY_[A-Z]+_', r'', short)
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description = 'lifetime: ' + short
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key = StorageKey(version=self.version,
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id=1, lifetime=lifetime,
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type='PSA_KEY_TYPE_RAW_DATA', bits=8,
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usage='PSA_KEY_USAGE_EXPORT', alg=0, alg2=0,
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material=b'L',
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description=description)
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return key
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def all_keys_for_lifetimes(self) -> Iterator[StorageKey]:
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"""Generate test keys covering lifetimes."""
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lifetimes = sorted(self.constructors.lifetimes)
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expressions = self.constructors.generate_expressions(lifetimes)
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for lifetime in expressions:
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# Don't attempt to create or load a volatile key in storage
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if 'VOLATILE' in lifetime:
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continue
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# Don't attempt to create a read-only key in storage,
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# but do attempt to load one.
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if 'READ_ONLY' in lifetime and self.forward:
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continue
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yield self.key_for_lifetime(lifetime)
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def key_for_usage_flags(
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self,
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usage_flags: List[str],
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short: Optional[str] = None
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) -> StorageKey:
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"""Construct a test key for the given key usage."""
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usage = ' | '.join(usage_flags) if usage_flags else '0'
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if short is None:
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short = re.sub(r'\bPSA_KEY_USAGE_', r'', usage)
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description = 'usage: ' + short
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key = StorageKey(version=self.version,
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id=1, lifetime=0x00000001,
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type='PSA_KEY_TYPE_RAW_DATA', bits=8,
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usage=usage, alg=0, alg2=0,
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material=b'K',
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description=description)
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return key
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def all_keys_for_usage_flags(self) -> Iterator[StorageKey]:
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"""Generate test keys covering usage flags."""
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known_flags = sorted(self.constructors.key_usage_flags)
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yield self.key_for_usage_flags(['0'])
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for usage_flag in known_flags:
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yield self.key_for_usage_flags([usage_flag])
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for flag1, flag2 in zip(known_flags,
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known_flags[1:] + [known_flags[0]]):
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yield self.key_for_usage_flags([flag1, flag2])
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yield self.key_for_usage_flags(known_flags, short='all known')
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def keys_for_type(
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self,
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key_type: str,
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params: Optional[Iterable[str]] = None
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) -> Iterator[StorageKey]:
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"""Generate test keys for the given key type.
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For key types that depend on a parameter (e.g. elliptic curve family),
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`param` is the parameter to pass to the constructor. Only a single
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parameter is supported.
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"""
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kt = crypto_knowledge.KeyType(key_type, params)
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for bits in kt.sizes_to_test():
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usage_flags = 'PSA_KEY_USAGE_EXPORT'
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alg = 0
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alg2 = 0
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key_material = kt.key_material(bits)
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short_expression = re.sub(r'\bPSA_(?:KEY_TYPE|ECC_FAMILY)_',
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r'',
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kt.expression)
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description = 'type: {} {}-bit'.format(short_expression, bits)
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key = StorageKey(version=self.version,
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id=1, lifetime=0x00000001,
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type=kt.expression, bits=bits,
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usage=usage_flags, alg=alg, alg2=alg2,
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material=key_material,
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description=description)
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yield key
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def all_keys_for_types(self) -> Iterator[StorageKey]:
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"""Generate test keys covering key types and their representations."""
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key_types = sorted(self.constructors.key_types)
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for key_type in self.constructors.generate_expressions(key_types):
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yield from self.keys_for_type(key_type)
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def keys_for_algorithm(self, alg: str) -> Iterator[StorageKey]:
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"""Generate test keys for the specified algorithm."""
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# For now, we don't have information on the compatibility of key
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# types and algorithms. So we just test the encoding of algorithms,
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# and not that operations can be performed with them.
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descr = re.sub(r'PSA_ALG_', r'', alg)
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descr = re.sub(r',', r', ', re.sub(r' +', r'', descr))
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usage = 'PSA_KEY_USAGE_EXPORT'
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key1 = StorageKey(version=self.version,
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id=1, lifetime=0x00000001,
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type='PSA_KEY_TYPE_RAW_DATA', bits=8,
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usage=usage, alg=alg, alg2=0,
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material=b'K',
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description='alg: ' + descr)
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yield key1
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key2 = StorageKey(version=self.version,
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id=1, lifetime=0x00000001,
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type='PSA_KEY_TYPE_RAW_DATA', bits=8,
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usage=usage, alg=0, alg2=alg,
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material=b'L',
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description='alg2: ' + descr)
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yield key2
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def all_keys_for_algorithms(self) -> Iterator[StorageKey]:
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"""Generate test keys covering algorithm encodings."""
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algorithms = sorted(self.constructors.algorithms)
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for alg in self.constructors.generate_expressions(algorithms):
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yield from self.keys_for_algorithm(alg)
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def all_test_cases(self) -> Iterator[test_case.TestCase]:
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"""Generate all storage format test cases."""
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# First build a list of all keys, then construct all the corresponding
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# test cases. This allows all required information to be obtained in
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# one go, which is a significant performance gain as the information
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# includes numerical values obtained by compiling a C program.
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keys = [] #type: List[StorageKey]
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keys += self.all_keys_for_lifetimes()
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keys += self.all_keys_for_usage_flags()
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keys += self.all_keys_for_types()
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keys += self.all_keys_for_algorithms()
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for key in keys:
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if key.location_value() != 0:
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# Skip keys with a non-default location, because they
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# require a driver and we currently have no mechanism to
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# determine whether a driver is available.
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continue
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yield self.make_test_case(key)
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class TestGenerator:
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"""Generate test data."""
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def __init__(self, options) -> None:
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self.test_suite_directory = self.get_option(options, 'directory',
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'tests/suites')
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self.info = Information()
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@staticmethod
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def get_option(options, name: str, default: T) -> T:
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value = getattr(options, name, None)
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return default if value is None else value
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def filename_for(self, basename: str) -> str:
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"""The location of the data file with the specified base name."""
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return posixpath.join(self.test_suite_directory, basename + '.data')
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def write_test_data_file(self, basename: str,
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test_cases: Iterable[test_case.TestCase]) -> None:
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"""Write the test cases to a .data file.
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The output file is ``basename + '.data'`` in the test suite directory.
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"""
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filename = self.filename_for(basename)
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test_case.write_data_file(filename, test_cases)
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TARGETS = {
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'test_suite_psa_crypto_not_supported.generated':
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lambda info: NotSupported(info).test_cases_for_not_supported(),
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'test_suite_psa_crypto_storage_format.current':
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lambda info: StorageFormat(info, 0, True).all_test_cases(),
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'test_suite_psa_crypto_storage_format.v0':
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lambda info: StorageFormat(info, 0, False).all_test_cases(),
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} #type: Dict[str, Callable[[Information], Iterable[test_case.TestCase]]]
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def generate_target(self, name: str) -> None:
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test_cases = self.TARGETS[name](self.info)
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self.write_test_data_file(name, test_cases)
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def main(args):
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"""Command line entry point."""
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('--list', action='store_true',
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help='List available targets and exit')
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parser.add_argument('targets', nargs='*', metavar='TARGET',
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help='Target file to generate (default: all; "-": none)')
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options = parser.parse_args(args)
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build_tree.chdir_to_root()
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generator = TestGenerator(options)
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if options.list:
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for name in sorted(generator.TARGETS):
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print(generator.filename_for(name))
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return
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if options.targets:
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# Allow "-" as a special case so you can run
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# ``generate_psa_tests.py - $targets`` and it works uniformly whether
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# ``$targets`` is empty or not.
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options.targets = [os.path.basename(re.sub(r'\.data\Z', r'', target))
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for target in options.targets
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if target != '-']
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else:
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options.targets = sorted(generator.TARGETS)
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for target in options.targets:
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generator.generate_target(target)
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if __name__ == '__main__':
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main(sys.argv[1:])
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