539 lines
23 KiB
Python
539 lines
23 KiB
Python
"""Collect macro definitions from header files.
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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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#
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import itertools
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import re
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from typing import Dict, IO, Iterable, Iterator, List, Optional, Pattern, Set, Tuple, Union
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class ReadFileLineException(Exception):
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def __init__(self, filename: str, line_number: Union[int, str]) -> None:
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message = 'in {} at {}'.format(filename, line_number)
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super(ReadFileLineException, self).__init__(message)
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self.filename = filename
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self.line_number = line_number
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class read_file_lines:
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# Dear Pylint, conventionally, a context manager class name is lowercase.
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# pylint: disable=invalid-name,too-few-public-methods
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"""Context manager to read a text file line by line.
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```
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with read_file_lines(filename) as lines:
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for line in lines:
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process(line)
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```
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is equivalent to
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```
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with open(filename, 'r') as input_file:
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for line in input_file:
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process(line)
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```
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except that if process(line) raises an exception, then the read_file_lines
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snippet annotates the exception with the file name and line number.
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"""
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def __init__(self, filename: str, binary: bool = False) -> None:
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self.filename = filename
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self.file = None #type: Optional[IO[str]]
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self.line_number = 'entry' #type: Union[int, str]
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self.generator = None #type: Optional[Iterable[Tuple[int, str]]]
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self.binary = binary
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def __enter__(self) -> 'read_file_lines':
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self.file = open(self.filename, 'rb' if self.binary else 'r')
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self.generator = enumerate(self.file)
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return self
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def __iter__(self) -> Iterator[str]:
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assert self.generator is not None
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for line_number, content in self.generator:
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self.line_number = line_number
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yield content
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self.line_number = 'exit'
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def __exit__(self, exc_type, exc_value, exc_traceback) -> None:
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if self.file is not None:
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self.file.close()
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if exc_type is not None:
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raise ReadFileLineException(self.filename, self.line_number) \
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from exc_value
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class PSAMacroEnumerator:
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"""Information about constructors of various PSA Crypto types.
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This includes macro names as well as information about their arguments
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when applicable.
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This class only provides ways to enumerate expressions that evaluate to
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values of the covered types. Derived classes are expected to populate
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the set of known constructors of each kind, as well as populate
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`self.arguments_for` for arguments that are not of a kind that is
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enumerated here.
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"""
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#pylint: disable=too-many-instance-attributes
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def __init__(self) -> None:
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"""Set up an empty set of known constructor macros.
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"""
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self.statuses = set() #type: Set[str]
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self.lifetimes = set() #type: Set[str]
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self.locations = set() #type: Set[str]
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self.persistence_levels = set() #type: Set[str]
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self.algorithms = set() #type: Set[str]
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self.ecc_curves = set() #type: Set[str]
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self.dh_groups = set() #type: Set[str]
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self.key_types = set() #type: Set[str]
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self.key_usage_flags = set() #type: Set[str]
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self.hash_algorithms = set() #type: Set[str]
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self.mac_algorithms = set() #type: Set[str]
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self.ka_algorithms = set() #type: Set[str]
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self.kdf_algorithms = set() #type: Set[str]
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self.pake_algorithms = set() #type: Set[str]
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self.aead_algorithms = set() #type: Set[str]
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self.sign_algorithms = set() #type: Set[str]
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# macro name -> list of argument names
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self.argspecs = {} #type: Dict[str, List[str]]
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# argument name -> list of values
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self.arguments_for = {
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'mac_length': [],
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'min_mac_length': [],
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'tag_length': [],
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'min_tag_length': [],
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} #type: Dict[str, List[str]]
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# Whether to include intermediate macros in enumerations. Intermediate
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# macros serve as category headers and are not valid values of their
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# type. See `is_internal_name`.
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# Always false in this class, may be set to true in derived classes.
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self.include_intermediate = False
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def is_internal_name(self, name: str) -> bool:
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"""Whether this is an internal macro. Internal macros will be skipped."""
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if not self.include_intermediate:
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if name.endswith('_BASE') or name.endswith('_NONE'):
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return True
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if '_CATEGORY_' in name:
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return True
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return name.endswith('_FLAG') or name.endswith('_MASK')
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def gather_arguments(self) -> None:
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"""Populate the list of values for macro arguments.
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Call this after parsing all the inputs.
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"""
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self.arguments_for['hash_alg'] = sorted(self.hash_algorithms)
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self.arguments_for['mac_alg'] = sorted(self.mac_algorithms)
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self.arguments_for['ka_alg'] = sorted(self.ka_algorithms)
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self.arguments_for['kdf_alg'] = sorted(self.kdf_algorithms)
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self.arguments_for['aead_alg'] = sorted(self.aead_algorithms)
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self.arguments_for['sign_alg'] = sorted(self.sign_algorithms)
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self.arguments_for['curve'] = sorted(self.ecc_curves)
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self.arguments_for['group'] = sorted(self.dh_groups)
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self.arguments_for['persistence'] = sorted(self.persistence_levels)
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self.arguments_for['location'] = sorted(self.locations)
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self.arguments_for['lifetime'] = sorted(self.lifetimes)
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@staticmethod
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def _format_arguments(name: str, arguments: Iterable[str]) -> str:
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"""Format a macro call with arguments.
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The resulting format is consistent with
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`InputsForTest.normalize_argument`.
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"""
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return name + '(' + ', '.join(arguments) + ')'
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_argument_split_re = re.compile(r' *, *')
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@classmethod
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def _argument_split(cls, arguments: str) -> List[str]:
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return re.split(cls._argument_split_re, arguments)
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def distribute_arguments(self, name: str) -> Iterator[str]:
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"""Generate macro calls with each tested argument set.
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If name is a macro without arguments, just yield "name".
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If name is a macro with arguments, yield a series of
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"name(arg1,...,argN)" where each argument takes each possible
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value at least once.
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"""
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try:
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if name not in self.argspecs:
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yield name
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return
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argspec = self.argspecs[name]
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if argspec == []:
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yield name + '()'
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return
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argument_lists = [self.arguments_for[arg] for arg in argspec]
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arguments = [values[0] for values in argument_lists]
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yield self._format_arguments(name, arguments)
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# Dear Pylint, enumerate won't work here since we're modifying
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# the array.
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# pylint: disable=consider-using-enumerate
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for i in range(len(arguments)):
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for value in argument_lists[i][1:]:
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arguments[i] = value
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yield self._format_arguments(name, arguments)
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arguments[i] = argument_lists[i][0]
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except BaseException as e:
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raise Exception('distribute_arguments({})'.format(name)) from e
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def distribute_arguments_without_duplicates(
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self, seen: Set[str], name: str
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) -> Iterator[str]:
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"""Same as `distribute_arguments`, but don't repeat seen results."""
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for result in self.distribute_arguments(name):
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if result not in seen:
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seen.add(result)
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yield result
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def generate_expressions(self, names: Iterable[str]) -> Iterator[str]:
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"""Generate expressions covering values constructed from the given names.
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`names` can be any iterable collection of macro names.
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For example:
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* ``generate_expressions(['PSA_ALG_CMAC', 'PSA_ALG_HMAC'])``
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generates ``'PSA_ALG_CMAC'`` as well as ``'PSA_ALG_HMAC(h)'`` for
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every known hash algorithm ``h``.
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* ``macros.generate_expressions(macros.key_types)`` generates all
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key types.
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"""
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seen = set() #type: Set[str]
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return itertools.chain(*(
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self.distribute_arguments_without_duplicates(seen, name)
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for name in names
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))
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class PSAMacroCollector(PSAMacroEnumerator):
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"""Collect PSA crypto macro definitions from C header files.
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"""
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def __init__(self, include_intermediate: bool = False) -> None:
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"""Set up an object to collect PSA macro definitions.
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Call the read_file method of the constructed object on each header file.
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* include_intermediate: if true, include intermediate macros such as
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PSA_XXX_BASE that do not designate semantic values.
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"""
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super().__init__()
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self.include_intermediate = include_intermediate
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self.key_types_from_curve = {} #type: Dict[str, str]
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self.key_types_from_group = {} #type: Dict[str, str]
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self.algorithms_from_hash = {} #type: Dict[str, str]
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@staticmethod
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def algorithm_tester(name: str) -> str:
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"""The predicate for whether an algorithm is built from the given constructor.
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The given name must be the name of an algorithm constructor of the
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form ``PSA_ALG_xxx`` which is used as ``PSA_ALG_xxx(yyy)`` to build
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an algorithm value. Return the corresponding predicate macro which
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is used as ``predicate(alg)`` to test whether ``alg`` can be built
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as ``PSA_ALG_xxx(yyy)``. The predicate is usually called
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``PSA_ALG_IS_xxx``.
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"""
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prefix = 'PSA_ALG_'
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assert name.startswith(prefix)
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midfix = 'IS_'
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suffix = name[len(prefix):]
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if suffix in ['DSA', 'ECDSA']:
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midfix += 'RANDOMIZED_'
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elif suffix == 'RSA_PSS':
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suffix += '_STANDARD_SALT'
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return prefix + midfix + suffix
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def record_algorithm_subtype(self, name: str, expansion: str) -> None:
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"""Record the subtype of an algorithm constructor.
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Given a ``PSA_ALG_xxx`` macro name and its expansion, if the algorithm
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is of a subtype that is tracked in its own set, add it to the relevant
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set.
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"""
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# This code is very ad hoc and fragile. It should be replaced by
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# something more robust.
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if re.match(r'MAC(?:_|\Z)', name):
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self.mac_algorithms.add(name)
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elif re.match(r'KDF(?:_|\Z)', name):
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self.kdf_algorithms.add(name)
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elif re.search(r'0x020000[0-9A-Fa-f]{2}', expansion):
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self.hash_algorithms.add(name)
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elif re.search(r'0x03[0-9A-Fa-f]{6}', expansion):
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self.mac_algorithms.add(name)
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elif re.search(r'0x05[0-9A-Fa-f]{6}', expansion):
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self.aead_algorithms.add(name)
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elif re.search(r'0x09[0-9A-Fa-f]{2}0000', expansion):
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self.ka_algorithms.add(name)
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elif re.search(r'0x08[0-9A-Fa-f]{6}', expansion):
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self.kdf_algorithms.add(name)
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# "#define" followed by a macro name with either no parameters
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# or a single parameter and a non-empty expansion.
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# Grab the macro name in group 1, the parameter name if any in group 2
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# and the expansion in group 3.
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_define_directive_re = re.compile(r'\s*#\s*define\s+(\w+)' +
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r'(?:\s+|\((\w+)\)\s*)' +
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r'(.+)')
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_deprecated_definition_re = re.compile(r'\s*MBEDTLS_DEPRECATED')
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def read_line(self, line):
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"""Parse a C header line and record the PSA identifier it defines if any.
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This function analyzes lines that start with "#define PSA_"
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(up to non-significant whitespace) and skips all non-matching lines.
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"""
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# pylint: disable=too-many-branches
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m = re.match(self._define_directive_re, line)
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if not m:
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return
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name, parameter, expansion = m.groups()
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expansion = re.sub(r'/\*.*?\*/|//.*', r' ', expansion)
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if parameter:
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self.argspecs[name] = [parameter]
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if re.match(self._deprecated_definition_re, expansion):
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# Skip deprecated values, which are assumed to be
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# backward compatibility aliases that share
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# numerical values with non-deprecated values.
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return
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if self.is_internal_name(name):
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# Macro only to build actual values
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return
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elif (name.startswith('PSA_ERROR_') or name == 'PSA_SUCCESS') \
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and not parameter:
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self.statuses.add(name)
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elif name.startswith('PSA_KEY_TYPE_') and not parameter:
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self.key_types.add(name)
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elif name.startswith('PSA_KEY_TYPE_') and parameter == 'curve':
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self.key_types_from_curve[name] = name[:13] + 'IS_' + name[13:]
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elif name.startswith('PSA_KEY_TYPE_') and parameter == 'group':
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self.key_types_from_group[name] = name[:13] + 'IS_' + name[13:]
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elif name.startswith('PSA_ECC_FAMILY_') and not parameter:
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self.ecc_curves.add(name)
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elif name.startswith('PSA_DH_FAMILY_') and not parameter:
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self.dh_groups.add(name)
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elif name.startswith('PSA_ALG_') and not parameter:
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if name in ['PSA_ALG_ECDSA_BASE',
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'PSA_ALG_RSA_PKCS1V15_SIGN_BASE']:
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# Ad hoc skipping of duplicate names for some numerical values
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return
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self.algorithms.add(name)
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self.record_algorithm_subtype(name, expansion)
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elif name.startswith('PSA_ALG_') and parameter == 'hash_alg':
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self.algorithms_from_hash[name] = self.algorithm_tester(name)
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elif name.startswith('PSA_KEY_USAGE_') and not parameter:
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self.key_usage_flags.add(name)
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else:
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# Other macro without parameter
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return
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_nonascii_re = re.compile(rb'[^\x00-\x7f]+')
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_continued_line_re = re.compile(rb'\\\r?\n\Z')
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def read_file(self, header_file):
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for line in header_file:
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m = re.search(self._continued_line_re, line)
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while m:
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cont = next(header_file)
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line = line[:m.start(0)] + cont
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m = re.search(self._continued_line_re, line)
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line = re.sub(self._nonascii_re, rb'', line).decode('ascii')
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self.read_line(line)
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class InputsForTest(PSAMacroEnumerator):
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# pylint: disable=too-many-instance-attributes
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"""Accumulate information about macros to test.
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enumerate
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This includes macro names as well as information about their arguments
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when applicable.
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"""
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def __init__(self) -> None:
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super().__init__()
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self.all_declared = set() #type: Set[str]
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# Identifier prefixes
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self.table_by_prefix = {
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'ERROR': self.statuses,
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'ALG': self.algorithms,
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'ECC_CURVE': self.ecc_curves,
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'DH_GROUP': self.dh_groups,
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'KEY_LIFETIME': self.lifetimes,
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'KEY_LOCATION': self.locations,
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'KEY_PERSISTENCE': self.persistence_levels,
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'KEY_TYPE': self.key_types,
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'KEY_USAGE': self.key_usage_flags,
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} #type: Dict[str, Set[str]]
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# Test functions
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self.table_by_test_function = {
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# Any function ending in _algorithm also gets added to
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# self.algorithms.
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'key_type': [self.key_types],
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'block_cipher_key_type': [self.key_types],
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'stream_cipher_key_type': [self.key_types],
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'ecc_key_family': [self.ecc_curves],
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'ecc_key_types': [self.ecc_curves],
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'dh_key_family': [self.dh_groups],
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'dh_key_types': [self.dh_groups],
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'hash_algorithm': [self.hash_algorithms],
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'mac_algorithm': [self.mac_algorithms],
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'cipher_algorithm': [],
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'hmac_algorithm': [self.mac_algorithms, self.sign_algorithms],
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'aead_algorithm': [self.aead_algorithms],
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'key_derivation_algorithm': [self.kdf_algorithms],
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'key_agreement_algorithm': [self.ka_algorithms],
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'asymmetric_signature_algorithm': [self.sign_algorithms],
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'asymmetric_signature_wildcard': [self.algorithms],
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'asymmetric_encryption_algorithm': [],
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'pake_algorithm': [self.pake_algorithms],
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'other_algorithm': [],
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'lifetime': [self.lifetimes],
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} #type: Dict[str, List[Set[str]]]
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mac_lengths = [str(n) for n in [
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1, # minimum expressible
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4, # minimum allowed by policy
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13, # an odd size in a plausible range
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14, # an even non-power-of-two size in a plausible range
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16, # same as full size for at least one algorithm
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63, # maximum expressible
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]]
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self.arguments_for['mac_length'] += mac_lengths
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self.arguments_for['min_mac_length'] += mac_lengths
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aead_lengths = [str(n) for n in [
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1, # minimum expressible
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4, # minimum allowed by policy
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13, # an odd size in a plausible range
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14, # an even non-power-of-two size in a plausible range
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16, # same as full size for at least one algorithm
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63, # maximum expressible
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]]
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self.arguments_for['tag_length'] += aead_lengths
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self.arguments_for['min_tag_length'] += aead_lengths
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def add_numerical_values(self) -> None:
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"""Add numerical values that are not supported to the known identifiers."""
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# Sets of names per type
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self.algorithms.add('0xffffffff')
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self.ecc_curves.add('0xff')
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self.dh_groups.add('0xff')
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self.key_types.add('0xffff')
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self.key_usage_flags.add('0x80000000')
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# Hard-coded values for unknown algorithms
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#
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# These have to have values that are correct for their respective
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# PSA_ALG_IS_xxx macros, but are also not currently assigned and are
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# not likely to be assigned in the near future.
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self.hash_algorithms.add('0x020000fe') # 0x020000ff is PSA_ALG_ANY_HASH
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self.mac_algorithms.add('0x03007fff')
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self.ka_algorithms.add('0x09fc0000')
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self.kdf_algorithms.add('0x080000ff')
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self.pake_algorithms.add('0x0a0000ff')
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# For AEAD algorithms, the only variability is over the tag length,
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# and this only applies to known algorithms, so don't test an
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# unknown algorithm.
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def get_names(self, type_word: str) -> Set[str]:
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"""Return the set of known names of values of the given type."""
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return {
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'status': self.statuses,
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'algorithm': self.algorithms,
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'ecc_curve': self.ecc_curves,
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'dh_group': self.dh_groups,
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'key_type': self.key_types,
|
|
'key_usage': self.key_usage_flags,
|
|
}[type_word]
|
|
|
|
# Regex for interesting header lines.
|
|
# Groups: 1=macro name, 2=type, 3=argument list (optional).
|
|
_header_line_re = \
|
|
re.compile(r'#define +' +
|
|
r'(PSA_((?:(?:DH|ECC|KEY)_)?[A-Z]+)_\w+)' +
|
|
r'(?:\(([^\n()]*)\))?')
|
|
# Regex of macro names to exclude.
|
|
_excluded_name_re = re.compile(r'_(?:GET|IS|OF)_|_(?:BASE|FLAG|MASK)\Z')
|
|
# Additional excluded macros.
|
|
_excluded_names = set([
|
|
# Macros that provide an alternative way to build the same
|
|
# algorithm as another macro.
|
|
'PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG',
|
|
'PSA_ALG_FULL_LENGTH_MAC',
|
|
# Auxiliary macro whose name doesn't fit the usual patterns for
|
|
# auxiliary macros.
|
|
'PSA_ALG_AEAD_WITH_DEFAULT_LENGTH_TAG_CASE',
|
|
])
|
|
def parse_header_line(self, line: str) -> None:
|
|
"""Parse a C header line, looking for "#define PSA_xxx"."""
|
|
m = re.match(self._header_line_re, line)
|
|
if not m:
|
|
return
|
|
name = m.group(1)
|
|
self.all_declared.add(name)
|
|
if re.search(self._excluded_name_re, name) or \
|
|
name in self._excluded_names or \
|
|
self.is_internal_name(name):
|
|
return
|
|
dest = self.table_by_prefix.get(m.group(2))
|
|
if dest is None:
|
|
return
|
|
dest.add(name)
|
|
if m.group(3):
|
|
self.argspecs[name] = self._argument_split(m.group(3))
|
|
|
|
_nonascii_re = re.compile(rb'[^\x00-\x7f]+') #type: Pattern
|
|
def parse_header(self, filename: str) -> None:
|
|
"""Parse a C header file, looking for "#define PSA_xxx"."""
|
|
with read_file_lines(filename, binary=True) as lines:
|
|
for line in lines:
|
|
line = re.sub(self._nonascii_re, rb'', line).decode('ascii')
|
|
self.parse_header_line(line)
|
|
|
|
_macro_identifier_re = re.compile(r'[A-Z]\w+')
|
|
def generate_undeclared_names(self, expr: str) -> Iterable[str]:
|
|
for name in re.findall(self._macro_identifier_re, expr):
|
|
if name not in self.all_declared:
|
|
yield name
|
|
|
|
def accept_test_case_line(self, function: str, argument: str) -> bool:
|
|
#pylint: disable=unused-argument
|
|
undeclared = list(self.generate_undeclared_names(argument))
|
|
if undeclared:
|
|
raise Exception('Undeclared names in test case', undeclared)
|
|
return True
|
|
|
|
@staticmethod
|
|
def normalize_argument(argument: str) -> str:
|
|
"""Normalize whitespace in the given C expression.
|
|
|
|
The result uses the same whitespace as
|
|
` PSAMacroEnumerator.distribute_arguments`.
|
|
"""
|
|
return re.sub(r',', r', ', re.sub(r' +', r'', argument))
|
|
|
|
def add_test_case_line(self, function: str, argument: str) -> None:
|
|
"""Parse a test case data line, looking for algorithm metadata tests."""
|
|
sets = []
|
|
if function.endswith('_algorithm'):
|
|
sets.append(self.algorithms)
|
|
if function == 'key_agreement_algorithm' and \
|
|
argument.startswith('PSA_ALG_KEY_AGREEMENT('):
|
|
# We only want *raw* key agreement algorithms as such, so
|
|
# exclude ones that are already chained with a KDF.
|
|
# Keep the expression as one to test as an algorithm.
|
|
function = 'other_algorithm'
|
|
sets += self.table_by_test_function[function]
|
|
if self.accept_test_case_line(function, argument):
|
|
for s in sets:
|
|
s.add(self.normalize_argument(argument))
|
|
|
|
# Regex matching a *.data line containing a test function call and
|
|
# its arguments. The actual definition is partly positional, but this
|
|
# regex is good enough in practice.
|
|
_test_case_line_re = re.compile(r'(?!depends_on:)(\w+):([^\n :][^:\n]*)')
|
|
def parse_test_cases(self, filename: str) -> None:
|
|
"""Parse a test case file (*.data), looking for algorithm metadata tests."""
|
|
with read_file_lines(filename) as lines:
|
|
for line in lines:
|
|
m = re.match(self._test_case_line_re, line)
|
|
if m:
|
|
self.add_test_case_line(m.group(1), m.group(2))
|