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# Copyright 2020, Microsoft Corporation
#
# SPDX-License-Identifier: LGPL-2.1-only
#
import sys
import configparser
import logging
from datetime import datetime, timezone
from typing import List
from ..exception import InvalidCheckerConfig, InvalidCheckerModule
from ..policyrep import SELinuxPolicy
from .checkermodule import CHECKER_REGISTRY, CheckerModule
from .globalkeys import CHECK_TYPE_KEY
SECTION_SEPARATOR = "---------------------------------------------------------\n\n"
class PolicyChecker:
"""Configuration file-driven automated policy analysis checks."""
def __init__(self, policy: SELinuxPolicy, configpath: str) -> None:
assert CHECKER_REGISTRY, "No checks are loaded, this is a bug."
self.log = logging.getLogger(__name__)
self.policy = policy
self.checks: List[CheckerModule] = []
self.config = configpath
@property
def config(self):
return self._configpath
@config.setter
def config(self, configpath: str):
self.log.info("Opening policy checker config {}.".format(configpath))
try:
with open(configpath, "r") as fd:
config = configparser.ConfigParser()
config.read_file(fd, source=configpath)
except Exception as e:
raise InvalidCheckerConfig("Unable to parse checker config {}: {}".format(
configpath, e)) from e
self.log.info("Validating configuration settings.")
checks = []
for checkname, checkconfig in config.items():
if checkname == "DEFAULT":
# top level/DEFAULT section is not a check.
continue
try:
check_type = checkconfig[CHECK_TYPE_KEY]
except KeyError as e:
raise InvalidCheckerModule("{}: Missing {} option.".
format(checkname, CHECK_TYPE_KEY))
try:
newcheck = CHECKER_REGISTRY[check_type](self.policy, checkname, checkconfig)
except KeyError as e:
raise InvalidCheckerModule("{}: Unknown policy check type: {}".
format(checkname, check_type)) from e
checks.append(newcheck)
if not checks:
raise InvalidCheckerConfig("No checks found in {}.".format(configpath))
self.log.debug("Validated {} checks.".format(len(self.checks)))
self.log.info("Successfully opened policy checker config {}.".format(configpath))
self._configpath = configpath
self.checks = checks
self._config = config
def run(self, output=sys.stdout) -> int:
"""Run all configured checks and print report to the file-like output."""
failures = 0
assert self.checks, "Configuration loaded but no checks configured. This is a bug."
output.write(SECTION_SEPARATOR)
output.write("Policy check configuration: {}\n".format(self.config))
output.write("Policy being checked: {}\n".format(self.policy))
output.write("Start time: {}\n\n".format(datetime.now(timezone.utc)))
result_summary = []
for check in self.checks:
check_failures = 0
try:
output.write(SECTION_SEPARATOR)
output.write("Check name: {}\n\n".format(check.checkname))
if check.desc:
output.write("Description: {}\n\n".format(check.desc))
if check.disable:
output.write("Check DISABLED. Reason: {}\n\n".format(check.disable))
result_summary.append((check.checkname, "DISABLED ({})".format(check.disable)))
self.log.debug("Skipping disabled check {!r}: {}".format(check.checkname,
check.disable))
continue
self.log.debug("Running check {0!r}, type {1}.".format(
check.checkname, check.check_type))
check.output = output
check_failures += len(check.run())
output.write("\n")
except Exception as e:
output.write("Unexpected error: {}. Failing check.\n\n".format(e))
self.log.debug("Exception info", exc_info=e)
check_failures += 1
if check_failures:
output.write("Check FAILED\n\n")
result_summary.append((check.checkname, "FAILED ({} failures)".format(
check_failures)))
else:
output.write("Check PASSED\n\n")
result_summary.append((check.checkname, "PASSED"))
failures += check_failures
output.write(SECTION_SEPARATOR)
output.write("Result Summary:\n\n")
for checkname, result in result_summary:
output.write("{:<39} {}\n".format(checkname, result))
output.write("\n{} failure(s) found.\n\n".format(failures))
output.write("Policy check configuration: {}\n".format(self.config))
output.write("Policy being checked: {}\n".format(self.policy))
output.write("End time: {}\n".format(datetime.now(timezone.utc)))
self.log.info("{} failures found in {} checks.".format(failures, len(self.checks)))
return failures