| # Copyright 2016, Tresys Technology, LLC |
| # |
| # This file is part of SETools. |
| # |
| # SETools is free software: you can redistribute it and/or modify |
| # it under the terms of the GNU Lesser General Public License as |
| # published by the Free Software Foundation, either version 2.1 of |
| # the License, or (at your option) any later version. |
| # |
| # SETools is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU Lesser General Public License for more details. |
| # |
| # You should have received a copy of the GNU Lesser General Public |
| # License along with SETools. If not, see |
| # <http://www.gnu.org/licenses/>. |
| # |
| from collections import namedtuple |
| |
| from .descriptors import DiffResultDescriptor |
| from .difference import Difference, SymbolWrapper, Wrapper |
| |
| |
| modified_default_record = namedtuple("modified_default", ["rule", |
| "added_default", |
| "removed_default", |
| "added_default_range", |
| "removed_default_range"]) |
| |
| |
| class DefaultsDifference(Difference): |
| |
| """Determine the difference in default_* between two policies.""" |
| |
| added_defaults = DiffResultDescriptor("diff_defaults") |
| removed_defaults = DiffResultDescriptor("diff_defaults") |
| modified_defaults = DiffResultDescriptor("diff_defaults") |
| |
| def diff_defaults(self): |
| """Generate the difference in type defaults between the policies.""" |
| |
| self.log.info( |
| "Generating default_* differences from {0.left_policy} to {0.right_policy}". |
| format(self)) |
| |
| self.added_defaults, self.removed_defaults, matched_defaults = self._set_diff( |
| (DefaultWrapper(d) for d in self.left_policy.defaults()), |
| (DefaultWrapper(d) for d in self.right_policy.defaults())) |
| |
| self.modified_defaults = [] |
| |
| for left_default, right_default in matched_defaults: |
| # Criteria for modified defaults |
| # 1. change to default setting |
| # 2. change to default range |
| |
| if left_default.default != right_default.default: |
| removed_default = left_default.default |
| added_default = right_default.default |
| else: |
| removed_default = None |
| added_default = None |
| |
| try: |
| if left_default.default_range != right_default.default_range: |
| removed_default_range = left_default.default_range |
| added_default_range = right_default.default_range |
| else: |
| removed_default_range = None |
| added_default_range = None |
| except AttributeError: |
| removed_default_range = None |
| added_default_range = None |
| |
| if removed_default or removed_default_range: |
| self.modified_defaults.append( |
| modified_default_record(left_default, |
| added_default, |
| removed_default, |
| added_default_range, |
| removed_default_range)) |
| |
| # |
| # Internal functions |
| # |
| def _reset_diff(self): |
| """Reset diff results on policy changes.""" |
| self.log.debug("Resetting default_* differences") |
| self.added_defaults = None |
| self.removed_defaults = None |
| self.modified_defaults = None |
| |
| |
| class DefaultWrapper(Wrapper): |
| |
| """Wrap default_* to allow comparisons.""" |
| |
| def __init__(self, default): |
| self.origin = default |
| self.ruletype = default.ruletype |
| self.tclass = SymbolWrapper(default.tclass) |
| self.key = hash(default) |
| |
| def __hash__(self): |
| return self.key |
| |
| def __lt__(self, other): |
| return self.key < other.key |
| |
| def __eq__(self, other): |
| return self.ruletype == other.ruletype and \ |
| self.tclass == other.tclass |