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Editing: assertrbac.py

# Copyright 2020, Microsoft Corporation
# Copyright 2020, Chris PeBenito <pebenito@ieee.org>
#
# SPDX-License-Identifier: LGPL-2.1-only
#

import logging
from typing import List, Union

from ..exception import InvalidCheckValue
from ..policyrep import AnyRBACRule
from ..rbacrulequery import RBACRuleQuery
from .checkermodule import CheckerModule
from .descriptors import ConfigDescriptor, ConfigSetDescriptor

SOURCE_OPT = "source"
TARGET_OPT = "target"
EXEMPT_SRC_OPT = "exempt_source"
EXEMPT_TGT_OPT = "exempt_target"
EXPECT_SRC_OPT = "expect_source"
EXPECT_TGT_OPT = "expect_target"

class AssertRBAC(CheckerModule):

"""Checker module for asserting a RBAC allow rule exists (or not)."""

check_type = "assert_rbac"
    check_config = frozenset((SOURCE_OPT, TARGET_OPT, EXEMPT_SRC_OPT, EXEMPT_TGT_OPT,
                              EXPECT_SRC_OPT, EXPECT_TGT_OPT))

source = ConfigDescriptor("lookup_role")
    target = ConfigDescriptor("lookup_role")

exempt_source = ConfigSetDescriptor("lookup_role", strict=False, expand=True)
    exempt_target = ConfigSetDescriptor("lookup_role", strict=False, expand=True)
    expect_source = ConfigSetDescriptor("lookup_role", strict=True, expand=True)
    expect_target = ConfigSetDescriptor("lookup_role", strict=True, expand=True)

def __init__(self, policy, checkname, config) -> None:
        super().__init__(policy, checkname, config)
        self.log = logging.getLogger(__name__)

self.source = config.get(SOURCE_OPT)
        self.target = config.get(TARGET_OPT)

self.exempt_source = config.get(EXEMPT_SRC_OPT)
        self.exempt_target = config.get(EXEMPT_TGT_OPT)
        self.expect_source = config.get(EXPECT_SRC_OPT)
        self.expect_target = config.get(EXPECT_TGT_OPT)

if not any((self.source, self.target)):
            raise InvalidCheckValue(
                "At least one of source or target options must be set.")

source_exempt_expect_overlap = self.exempt_source & self.expect_source
        if source_exempt_expect_overlap:
            self.log.info("Overlap in expect_source and exempt_source: {}".
                          format(", ".join(i.name for i in source_exempt_expect_overlap)))

target_exempt_expect_overlap = self.exempt_target & self.expect_target
        if target_exempt_expect_overlap:
            self.log.info("Overlap in expect_target and exempt_target: {}".
                          format(", ".join(i.name for i in target_exempt_expect_overlap)))

def run(self) -> List:
        assert any((self.source, self.target)), "AssertRBAC no options set, this is a bug."

self.log.info("Checking RBAC allow rule assertion.")

query = RBACRuleQuery(self.policy,
                              source=self.source,
                              target=self.target,
                              ruletype=("allow",))

unseen_sources = set(self.expect_source)
        unseen_targets = set(self.expect_target)
        failures: List[Union[AnyRBACRule, str]] = []
        for rule in sorted(query.results()):
            srcs = set(rule.source.expand())
            tgts = set(rule.target.expand())

unseen_sources -= srcs
            unseen_targets -= tgts
            if (srcs - self.expect_source - self.exempt_source) and \
                    (tgts - self.expect_target - self.exempt_target):

self.log_fail(str(rule))
                failures.append(rule)
            else:
                self.log_ok(str(rule))

for item in unseen_sources:
            failure = "Expected rule with source \"{}\" not found.".format(item)
            self.log_fail(failure)
            failures.append(failure)

for item in unseen_targets:
            failure = "Expected rule with target \"{}\" not found.".format(item)
            self.log_fail(failure)
            failures.append(failure)

self.log.debug("{} failure(s)".format(failures))
        return failures

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