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7bf5205581
mbedtls/tests/scripts/check_names.py
Gilles Peskine 7bf5205581 More robust handling of excluded files 
Don't try to enumerate excluded files. List included files, and remove names
from the list if they match an excluded-file pattern.

This resolves the problem that the script could get into an infinite loop
due to the use of recursive globbing. Unfortunately, Python's recursive
globs follows symbolic links to directories, which leads to an infinite loop
if a symbolic link points to an ancestor of the directory that contains it.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-09-27 20:01:24 +02:00

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#!/usr/bin/env python3
#
# Copyright The Mbed TLS Contributors
# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
This script confirms that the naming of all symbols and identifiers in Mbed TLS
are consistent with the house style and are also self-consistent. It only runs
on Linux and macOS since it depends on nm.
It contains two major Python classes, CodeParser and NameChecker. They both have
a comprehensive "run-all" function (comprehensive_parse() and perform_checks())
but the individual functions can also be used for specific needs.
CodeParser makes heavy use of regular expressions to parse the code, and is
dependent on the current code formatting. Many Python C parser libraries require
preprocessed C code, which means no macro parsing. Compiler tools are also not
very helpful when we want the exact location in the original source (which
becomes impossible when e.g. comments are stripped).
NameChecker performs the following checks:
- All exported and available symbols in the library object files, are explicitly
declared in the header files. This uses the nm command.
- All macros, constants, and identifiers (function names, struct names, etc)
follow the required regex pattern.
- Typo checking: All words that begin with MBED exist as macros or constants.
The script returns 0 on success, 1 on test failure, and 2 if there is a script
error. It must be run from Mbed TLS root.
"""
import abc
import argparse
import fnmatch
import glob
import textwrap
import os
import sys
import traceback
import re
import enum
import shutil
import subprocess
import logging
# Naming patterns to check against. These are defined outside the NameCheck
# class for ease of modification.
MACRO_PATTERN = r"^(MBEDTLS|PSA)_[0-9A-Z_]*[0-9A-Z]$"
CONSTANTS_PATTERN = MACRO_PATTERN
IDENTIFIER_PATTERN = r"^(mbedtls|psa)_[0-9a-z_]*[0-9a-z]$"
class Match(): # pylint: disable=too-few-public-methods
"""
A class representing a match, together with its found position.
Fields:
* filename: the file that the match was in.
* line: the full line containing the match.
* line_no: the line number.
* pos: a tuple of (start, end) positions on the line where the match is.
* name: the match itself.
"""
def __init__(self, filename, line, line_no, pos, name):
# pylint: disable=too-many-arguments
self.filename = filename
self.line = line
self.line_no = line_no
self.pos = pos
self.name = name
def __str__(self):
"""
Return a formatted code listing representation of the erroneous line.
"""
gutter = format(self.line_no, "4d")
underline = self.pos[0] * " " + (self.pos[1] - self.pos[0]) * "^"
return (
" {0} |\n".format(" " * len(gutter)) +
" {0} | {1}".format(gutter, self.line) +
" {0} | {1}\n".format(" " * len(gutter), underline)
)
class Problem(abc.ABC): # pylint: disable=too-few-public-methods
"""
An abstract parent class representing a form of static analysis error.
It extends an Abstract Base Class, which means it is not instantiable, and
it also mandates certain abstract methods to be implemented in subclasses.
"""
# Class variable to control the quietness of all problems
quiet = False
def __init__(self):
self.textwrapper = textwrap.TextWrapper()
self.textwrapper.width = 80
self.textwrapper.initial_indent = " > "
self.textwrapper.subsequent_indent = " "
def __str__(self):
"""
Unified string representation method for all Problems.
"""
if self.__class__.quiet:
return self.quiet_output()
return self.verbose_output()
@abc.abstractmethod
def quiet_output(self):
"""
The output when --quiet is enabled.
"""
pass
@abc.abstractmethod
def verbose_output(self):
"""
The default output with explanation and code snippet if appropriate.
"""
pass
class SymbolNotInHeader(Problem): # pylint: disable=too-few-public-methods
"""
A problem that occurs when an exported/available symbol in the object file
is not explicitly declared in header files. Created with
NameCheck.check_symbols_declared_in_header()
Fields:
* symbol_name: the name of the symbol.
"""
def __init__(self, symbol_name):
self.symbol_name = symbol_name
Problem.__init__(self)
def quiet_output(self):
return "{0}".format(self.symbol_name)
def verbose_output(self):
return self.textwrapper.fill(
"'{0}' was found as an available symbol in the output of nm, "
"however it was not declared in any header files."
.format(self.symbol_name))
class PatternMismatch(Problem): # pylint: disable=too-few-public-methods
"""
A problem that occurs when something doesn't match the expected pattern.
Created with NameCheck.check_match_pattern()
Fields:
* pattern: the expected regex pattern
* match: the Match object in question
"""
def __init__(self, pattern, match):
self.pattern = pattern
self.match = match
Problem.__init__(self)
def quiet_output(self):
return (
"{0}:{1}:{2}"
.format(self.match.filename, self.match.line_no, self.match.name)
)
def verbose_output(self):
return self.textwrapper.fill(
"{0}:{1}: '{2}' does not match the required pattern '{3}'."
.format(
self.match.filename,
self.match.line_no,
self.match.name,
self.pattern
)
) + "\n" + str(self.match)
class Typo(Problem): # pylint: disable=too-few-public-methods
"""
A problem that occurs when a word using MBED doesn't appear to be defined as
constants nor enum values. Created with NameCheck.check_for_typos()
Fields:
* match: the Match object of the MBED name in question.
"""
def __init__(self, match):
self.match = match
Problem.__init__(self)
def quiet_output(self):
return (
"{0}:{1}:{2}"
.format(self.match.filename, self.match.line_no, self.match.name)
)
def verbose_output(self):
return self.textwrapper.fill(
"{0}:{1}: '{2}' looks like a typo. It was not found in any "
"macros or any enums. If this is not a typo, put "
"//no-check-names after it."
.format(self.match.filename, self.match.line_no, self.match.name)
) + "\n" + str(self.match)
class CodeParser():
"""
Class for retrieving files and parsing the code. This can be used
independently of the checks that NameChecker performs, for example for
list_internal_identifiers.py.
"""
def __init__(self, log):
self.log = log
self.check_repo_path()
# Memo for storing "glob expression": set(filepaths)
self.files = {}
# Globally excluded filenames.
# Note that "*" can match directory separators in exclude lists.
self.excluded_files = ["*/bn_mul", "*/compat-2.x.h"]
@staticmethod
def check_repo_path():
"""
Check that the current working directory is the project root, and throw
an exception if not.
"""
if not all(os.path.isdir(d) for d in ["include", "library", "tests"]):
raise Exception("This script must be run from Mbed TLS root")
def comprehensive_parse(self):
"""
Comprehensive ("default") function to call each parsing function and
retrieve various elements of the code, together with the source location.
Returns a dict of parsed item key to the corresponding List of Matches.
"""
self.log.info("Parsing source code...")
self.log.debug(
"The following files are excluded from the search: {}"
.format(str(self.excluded_files))
)
all_macros = self.parse_macros([
"include/mbedtls/*.h",
"include/psa/*.h",
"library/*.h",
"tests/include/test/drivers/*.h",
"3rdparty/everest/include/everest/everest.h",
"3rdparty/everest/include/everest/x25519.h"
])
enum_consts = self.parse_enum_consts([
"include/mbedtls/*.h",
"library/*.h",
"3rdparty/everest/include/everest/everest.h",
"3rdparty/everest/include/everest/x25519.h"
])
identifiers = self.parse_identifiers([
"include/mbedtls/*.h",
"include/psa/*.h",
"library/*.h",
"3rdparty/everest/include/everest/everest.h",
"3rdparty/everest/include/everest/x25519.h"
])
mbed_words = self.parse_mbed_words([
"include/mbedtls/*.h",
"include/psa/*.h",
"library/*.h",
"3rdparty/everest/include/everest/everest.h",
"3rdparty/everest/include/everest/x25519.h",
"library/*.c",
"3rdparty/everest/library/everest.c",
"3rdparty/everest/library/x25519.c"
])
symbols = self.parse_symbols()
# Remove identifier macros like mbedtls_printf or mbedtls_calloc
identifiers_justname = [x.name for x in identifiers]
actual_macros = []
for macro in all_macros:
if macro.name not in identifiers_justname:
actual_macros.append(macro)
self.log.debug("Found:")
# Aligns the counts on the assumption that none exceeds 4 digits
self.log.debug(" {:4} Total Macros".format(len(all_macros)))
self.log.debug(" {:4} Non-identifier Macros".format(len(actual_macros)))
self.log.debug(" {:4} Enum Constants".format(len(enum_consts)))
self.log.debug(" {:4} Identifiers".format(len(identifiers)))
self.log.debug(" {:4} Exported Symbols".format(len(symbols)))
return {
"macros": actual_macros,
"enum_consts": enum_consts,
"identifiers": identifiers,
"symbols": symbols,
"mbed_words": mbed_words
}
def is_file_excluded(self, path, exclude_wildcards):
"""Whether the give file path is excluded."""
# exclude_wildcards may be None. Also, consider the global exclusions.
exclude_wildcards = (exclude_wildcards or []) + self.excluded_files
for pattern in exclude_wildcards:
if fnmatch.fnmatch(path, pattern):
return True
return False
def get_files(self, include_wildcards, exclude_wildcards):
"""
Get all files that match any of the UNIX-style wildcards. While the
check_names script is designed only for use on UNIX/macOS (due to nm),
this function alone would work fine on Windows even with forward slashes
in the wildcard.
Args:
* include_wildcards: a List of shell-style wildcards to match filepaths.
* exclude_wildcards: a List of shell-style wildcards to exclude.
Returns a List of relative filepaths.
"""
accumulator = set()
for include_wildcard in include_wildcards:
accumulator = accumulator.union(glob.iglob(include_wildcard))
return list(path for path in accumulator
if not self.is_file_excluded(path, exclude_wildcards))
def parse_macros(self, include, exclude=None):
"""
Parse all macros defined by #define preprocessor directives.
Args:
* include: A List of glob expressions to look for files through.
* exclude: A List of glob expressions for excluding files.
Returns a List of Match objects for the found macros.
"""
macro_regex = re.compile(r"# *define +(?P<macro>\w+)")
exclusions = (
"asm", "inline", "EMIT", "_CRT_SECURE_NO_DEPRECATE", "MULADDC_"
)
files = self.get_files(include, exclude)
self.log.debug("Looking for macros in {} files".format(len(files)))
macros = []
for header_file in files:
with open(header_file, "r", encoding="utf-8") as header:
for line_no, line in enumerate(header):
for macro in macro_regex.finditer(line):
if macro.group("macro").startswith(exclusions):
continue
macros.append(Match(
header_file,
line,
line_no,
macro.span("macro"),
macro.group("macro")))
return macros
def parse_mbed_words(self, include, exclude=None):
"""
Parse all words in the file that begin with MBED, in and out of macros,
comments, anything.
Args:
* include: A List of glob expressions to look for files through.
* exclude: A List of glob expressions for excluding files.
Returns a List of Match objects for words beginning with MBED.
"""
# Typos of TLS are common, hence the broader check below than MBEDTLS.
mbed_regex = re.compile(r"\bMBED.+?_[A-Z0-9_]*")
exclusions = re.compile(r"// *no-check-names|#error")
files = self.get_files(include, exclude)
self.log.debug("Looking for MBED words in {} files".format(len(files)))
mbed_words = []
for filename in files:
with open(filename, "r", encoding="utf-8") as fp:
for line_no, line in enumerate(fp):
if exclusions.search(line):
continue
for name in mbed_regex.finditer(line):
mbed_words.append(Match(
filename,
line,
line_no,
name.span(0),
name.group(0)))
return mbed_words
def parse_enum_consts(self, include, exclude=None):
"""
Parse all enum value constants that are declared.
Args:
* include: A List of glob expressions to look for files through.
* exclude: A List of glob expressions for excluding files.
Returns a List of Match objects for the findings.
"""
files = self.get_files(include, exclude)
self.log.debug("Looking for enum consts in {} files".format(len(files)))
# Emulate a finite state machine to parse enum declarations.
# OUTSIDE_KEYWORD = outside the enum keyword
# IN_BRACES = inside enum opening braces
# IN_BETWEEN = between enum keyword and opening braces
states = enum.Enum("FSM", ["OUTSIDE_KEYWORD", "IN_BRACES", "IN_BETWEEN"])
enum_consts = []
for header_file in files:
state = states.OUTSIDE_KEYWORD
with open(header_file, "r", encoding="utf-8") as header:
for line_no, line in enumerate(header):
# Match typedefs and brackets only when they are at the
# beginning of the line -- if they are indented, they might
# be sub-structures within structs, etc.
if (state == states.OUTSIDE_KEYWORD and
re.search(r"^(typedef +)?enum +{", line)):
state = states.IN_BRACES
elif (state == states.OUTSIDE_KEYWORD and
re.search(r"^(typedef +)?enum", line)):
state = states.IN_BETWEEN
elif (state == states.IN_BETWEEN and
re.search(r"^{", line)):
state = states.IN_BRACES
elif (state == states.IN_BRACES and
re.search(r"^}", line)):
state = states.OUTSIDE_KEYWORD
elif (state == states.IN_BRACES and
not re.search(r"^ *#", line)):
enum_const = re.search(r"^ *(?P<enum_const>\w+)", line)
if not enum_const:
continue
enum_consts.append(Match(
header_file,
line,
line_no,
enum_const.span("enum_const"),
enum_const.group("enum_const")))
return enum_consts
def parse_identifiers(self, include, exclude=None):
"""
Parse all lines of a header where a function/enum/struct/union/typedef
identifier is declared, based on some regex and heuristics. Highly
dependent on formatting style.
Args:
* include: A List of glob expressions to look for files through.
* exclude: A List of glob expressions for excluding files.
Returns a List of Match objects with identifiers.
"""
identifier_regex = re.compile(
# Match " something(a" or " *something(a". Functions.
# Assumptions:
# - function definition from return type to one of its arguments is
# all on one line
# - function definition line only contains alphanumeric, asterisk,
# underscore, and open bracket
r".* \**(\w+) *\( *\w|"
# Match "(*something)(".
r".*\( *\* *(\w+) *\) *\(|"
# Match names of named data structures.
r"(?:typedef +)?(?:struct|union|enum) +(\w+)(?: *{)?$|"
# Match names of typedef instances, after closing bracket.
r"}? *(\w+)[;[].*"
)
# The regex below is indented for clarity.
exclusion_lines = re.compile(
r"^("
r"extern +\"C\"|" # pylint: disable=bad-continuation
r"(typedef +)?(struct|union|enum)( *{)?$|"
r"} *;?$|"
r"$|"
r"//|"
r"#"
r")"
)
files = self.get_files(include, exclude)
self.log.debug("Looking for identifiers in {} files".format(len(files)))
identifiers = []
for header_file in files:
with open(header_file, "r", encoding="utf-8") as header:
in_block_comment = False
# The previous line variable is used for concatenating lines
# when identifiers are formatted and spread across multiple
# lines.
previous_line = ""
for line_no, line in enumerate(header):
# Skip parsing this line if a block comment ends on it,
# but don't skip if it has just started -- there is a chance
# it ends on the same line.
if re.search(r"/\*", line):
in_block_comment = not in_block_comment
if re.search(r"\*/", line):
in_block_comment = not in_block_comment
continue
if in_block_comment:
previous_line = ""
continue
if exclusion_lines.search(line):
previous_line = ""
continue
# If the line contains only space-separated alphanumeric
# characters (or underscore, asterisk, or, open bracket),
# and nothing else, high chance it's a declaration that
# continues on the next line
if re.search(r"^([\w\*\(]+\s+)+$", line):
previous_line += line
continue
# If previous line seemed to start an unfinished declaration
# (as above), concat and treat them as one.
if previous_line:
line = previous_line.strip() + " " + line.strip() + "\n"
previous_line = ""
# Skip parsing if line has a space in front = heuristic to
# skip function argument lines (highly subject to formatting
# changes)
if line[0] == " ":
continue
identifier = identifier_regex.search(line)
if not identifier:
continue
# Find the group that matched, and append it
for group in identifier.groups():
if not group:
continue
identifiers.append(Match(
header_file,
line,
line_no,
identifier.span(),
group))
return identifiers
def parse_symbols(self):
"""
Compile the Mbed TLS libraries, and parse the TLS, Crypto, and x509
object files using nm to retrieve the list of referenced symbols.
Exceptions thrown here are rethrown because they would be critical
errors that void several tests, and thus needs to halt the program. This
is explicitly done for clarity.
Returns a List of unique symbols defined and used in the libraries.
"""
self.log.info("Compiling...")
symbols = []
# Back up the config and atomically compile with the full configratuion.
shutil.copy(
"include/mbedtls/mbedtls_config.h",
"include/mbedtls/mbedtls_config.h.bak"
)
try:
# Use check=True in all subprocess calls so that failures are raised
# as exceptions and logged.
subprocess.run(
["python3", "scripts/config.py", "full"],
universal_newlines=True,
check=True
)
my_environment = os.environ.copy()
my_environment["CFLAGS"] = "-fno-asynchronous-unwind-tables"
# Run make clean separately to lib to prevent unwanted behavior when
# make is invoked with parallelism.
subprocess.run(
["make", "clean"],
universal_newlines=True,
check=True
)
subprocess.run(
["make", "lib"],
env=my_environment,
universal_newlines=True,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
check=True
)
# Perform object file analysis using nm
symbols = self.parse_symbols_from_nm([
"library/libmbedcrypto.a",
"library/libmbedtls.a",
"library/libmbedx509.a"
])
subprocess.run(
["make", "clean"],
universal_newlines=True,
check=True
)
except subprocess.CalledProcessError as error:
self.log.debug(error.output)
raise error
finally:
# Put back the original config regardless of there being errors.
# Works also for keyboard interrupts.
shutil.move(
"include/mbedtls/mbedtls_config.h.bak",
"include/mbedtls/mbedtls_config.h"
)
return symbols
def parse_symbols_from_nm(self, object_files):
"""
Run nm to retrieve the list of referenced symbols in each object file.
Does not return the position data since it is of no use.
Args:
* object_files: a List of compiled object filepaths to search through.
Returns a List of unique symbols defined and used in any of the object
files.
"""
nm_undefined_regex = re.compile(r"^\S+: +U |^$|^\S+:$")
nm_valid_regex = re.compile(r"^\S+( [0-9A-Fa-f]+)* . _*(?P<symbol>\w+)")
exclusions = ("FStar", "Hacl")
symbols = []
# Gather all outputs of nm
nm_output = ""
for lib in object_files:
nm_output += subprocess.run(
["nm", "-og", lib],
universal_newlines=True,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
check=True
).stdout
for line in nm_output.splitlines():
if not nm_undefined_regex.search(line):
symbol = nm_valid_regex.search(line)
if (symbol and not symbol.group("symbol").startswith(exclusions)):
symbols.append(symbol.group("symbol"))
else:
self.log.error(line)
return symbols
class NameChecker():
"""
Representation of the core name checking operation performed by this script.
"""
def __init__(self, parse_result, log):
self.parse_result = parse_result
self.log = log
def perform_checks(self, quiet=False):
"""
A comprehensive checker that performs each check in order, and outputs
a final verdict.
Args:
* quiet: whether to hide detailed problem explanation.
"""
self.log.info("=============")
Problem.quiet = quiet
problems = 0
problems += self.check_symbols_declared_in_header()
pattern_checks = [
("macros", MACRO_PATTERN),
("enum_consts", CONSTANTS_PATTERN),
("identifiers", IDENTIFIER_PATTERN)
]
for group, check_pattern in pattern_checks:
problems += self.check_match_pattern(group, check_pattern)
problems += self.check_for_typos()
self.log.info("=============")
if problems > 0:
self.log.info("FAIL: {0} problem(s) to fix".format(str(problems)))
if quiet:
self.log.info("Remove --quiet to see explanations.")
else:
self.log.info("Use --quiet for minimal output.")
return 1
else:
self.log.info("PASS")
return 0
def check_symbols_declared_in_header(self):
"""
Perform a check that all detected symbols in the library object files
are properly declared in headers.
Assumes parse_names_in_source() was called before this.
Returns the number of problems that need fixing.
"""
problems = []
for symbol in self.parse_result["symbols"]:
found_symbol_declared = False
for identifier_match in self.parse_result["identifiers"]:
if symbol == identifier_match.name:
found_symbol_declared = True
break
if not found_symbol_declared:
problems.append(SymbolNotInHeader(symbol))
self.output_check_result("All symbols in header", problems)
return len(problems)
def check_match_pattern(self, group_to_check, check_pattern):
"""
Perform a check that all items of a group conform to a regex pattern.
Assumes parse_names_in_source() was called before this.
Args:
* group_to_check: string key to index into self.parse_result.
* check_pattern: the regex to check against.
Returns the number of problems that need fixing.
"""
problems = []
for item_match in self.parse_result[group_to_check]:
if not re.search(check_pattern, item_match.name):
problems.append(PatternMismatch(check_pattern, item_match))
# Double underscore should not be used for names
if re.search(r".*__.*", item_match.name):
problems.append(
PatternMismatch("no double underscore allowed", item_match))
self.output_check_result(
"Naming patterns of {}".format(group_to_check),
problems)
return len(problems)
def check_for_typos(self):
"""
Perform a check that all words in the soure code beginning with MBED are
either defined as macros, or as enum constants.
Assumes parse_names_in_source() was called before this.
Returns the number of problems that need fixing.
"""
problems = []
# Set comprehension, equivalent to a list comprehension wrapped by set()
all_caps_names = {
match.name
for match
in self.parse_result["macros"] + self.parse_result["enum_consts"]}
typo_exclusion = re.compile(r"XXX|__|_$|^MBEDTLS_.*CONFIG_FILE$")
for name_match in self.parse_result["mbed_words"]:
found = name_match.name in all_caps_names
# Since MBEDTLS_PSA_ACCEL_XXX defines are defined by the
# PSA driver, they will not exist as macros. However, they
# should still be checked for typos using the equivalent
# BUILTINs that exist.
if "MBEDTLS_PSA_ACCEL_" in name_match.name:
found = name_match.name.replace(
"MBEDTLS_PSA_ACCEL_",
"MBEDTLS_PSA_BUILTIN_") in all_caps_names
if not found and not typo_exclusion.search(name_match.name):
problems.append(Typo(name_match))
self.output_check_result("Likely typos", problems)
return len(problems)
def output_check_result(self, name, problems):
"""
Write out the PASS/FAIL status of a performed check depending on whether
there were problems.
Args:
* name: the name of the test
* problems: a List of encountered Problems
"""
if problems:
self.log.info("{}: FAIL\n".format(name))
for problem in problems:
self.log.warning(str(problem))
else:
self.log.info("{}: PASS".format(name))
def main():
"""
Perform argument parsing, and create an instance of CodeParser and
NameChecker to begin the core operation.
"""
parser = argparse.ArgumentParser(
formatter_class=argparse.RawDescriptionHelpFormatter,
description=(
"This script confirms that the naming of all symbols and identifiers "
"in Mbed TLS are consistent with the house style and are also "
"self-consistent.\n\n"
"Expected to be run from the MbedTLS root directory.")
)
parser.add_argument(
"-v", "--verbose",
action="store_true",
help="show parse results"
)
parser.add_argument(
"-q", "--quiet",
action="store_true",
help="hide unnecessary text, explanations, and highlighs"
)
args = parser.parse_args()
# Configure the global logger, which is then passed to the classes below
log = logging.getLogger()
log.setLevel(logging.DEBUG if args.verbose else logging.INFO)
log.addHandler(logging.StreamHandler())
try:
code_parser = CodeParser(log)
parse_result = code_parser.comprehensive_parse()
except Exception: # pylint: disable=broad-except
traceback.print_exc()
sys.exit(2)
name_checker = NameChecker(parse_result, log)
return_code = name_checker.perform_checks(quiet=args.quiet)
sys.exit(return_code)
if __name__ == "__main__":
main()
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