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# Copyright 2020, Microsoft Corporation # # SPDX-License-Identifier: LGPL-2.1-only # import logging from collections import defaultdict from typing import Dict, List, Set from ..policyrep import AnyTERule, Type from ..terulequery import TERuleQuery from .checkermodule import CheckerModule from .descriptors import ConfigSetDescriptor EXEMPT_WRITE = "exempt_write_domain" EXEMPT_EXEC = "exempt_exec_domain" EXEMPT_FILE = "exempt_file" class ReadOnlyExecutables(CheckerModule): """Checker module for asserting all executable files are read-only.""" check_type = "ro_execs" check_config = frozenset((EXEMPT_WRITE, EXEMPT_EXEC, EXEMPT_FILE)) exempt_write_domain = ConfigSetDescriptor("lookup_type_or_attr", strict=False, expand=True) exempt_file = ConfigSetDescriptor("lookup_type_or_attr", strict=False, expand=True) exempt_exec_domain = ConfigSetDescriptor("lookup_type_or_attr", strict=False, expand=True) def __init__(self, policy, checkname, config) -> None: super().__init__(policy, checkname, config) self.log = logging.getLogger(__name__) self.exempt_write_domain = config.get(EXEMPT_WRITE) self.exempt_file = config.get(EXEMPT_FILE) self.exempt_exec_domain = config.get(EXEMPT_EXEC) def _collect_executables(self) -> Dict[Type, Set[AnyTERule]]: self.log.debug("Collecting list of executable file types.") self.log.debug("Ignore exec domains: {!r}".format(self.exempt_exec_domain)) query = TERuleQuery(self.policy, ruletype=("allow",), tclass=("file",), perms=("execute", "execute_no_trans")) collected = defaultdict(set) for rule in query.results(): sources = set(rule.source.expand()) - self.exempt_exec_domain targets = set(rule.target.expand()) - self.exempt_file # ignore rule if source or target is an empty attr if not sources or not targets: self.log.debug("Ignoring execute rule: {}".format(rule)) continue for t in targets: self.log.debug("Determined {} is executable by: {}".format(t, rule)) collected[t].add(rule) return collected def run(self) -> List: self.log.info("Checking executables are read-only.") query = TERuleQuery(self.policy, ruletype=("allow",), tclass=("file",), perms=("write", "append")) executables = self._collect_executables() failures = defaultdict(set) for exec_type in executables.keys(): self.log.debug("Checking if executable type {} is writable.".format(exec_type)) query.target = exec_type for rule in sorted(query.results()): if set(rule.source.expand()) - self.exempt_write_domain: failures[exec_type].add(rule) for exec_type in sorted(failures.keys()): self.output.write("\n------------\n\n") self.output.write("Executable type {} is writable.\n\n".format(exec_type)) self.output.write("Execute rules:\n") for rule in sorted(executables[exec_type]): self.output.write(" * {}\n".format(rule)) self.output.write("\nWrite rules:\n") for rule in sorted(failures[exec_type]): self.log_fail(str(rule)) self.log.debug("{} failure(s)".format(len(failures))) return sorted(failures.keys())