<h2>Editing File: /lib64/python3.6/site-packages/setools/mixins.py</h2><form method='post'><textarea name='content' class='file-edit'># Copyright 2015, Tresys Technology, LLC
# Copyright 2019, Chris PeBenito &lt;pebenito@ieee.org&gt;
#
# 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
# &lt;http://www.gnu.org/licenses/&gt;.
#
# pylint: disable=attribute-defined-outside-init,no-member
import re

from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor
from .util import match_in_set, match_regex, match_range, match_regex_or_set


class MatchAlias:

    &quot;&quot;&quot;Mixin for matching an object's aliases.&quot;&quot;&quot;

    alias = CriteriaDescriptor(&quot;alias_regex&quot;)
    alias_regex = False

    def _match_alias_debug(self, log):
        &quot;&quot;&quot;Emit log debugging info for alias matching.&quot;&quot;&quot;
        log.debug(&quot;Alias: {0.alias}, regex: {0.alias_regex}&quot;.format(self))

    def _match_alias(self, obj):
        &quot;&quot;&quot;
        Match the alias criteria

        Parameter:
        obj     An object with an alias generator method named &quot;aliases&quot;
        &quot;&quot;&quot;

        if not self.alias:
            # if there is no criteria, everything matches.
            return True

        return match_in_set(obj.aliases(), self.alias, self.alias_regex)


class MatchContext:

    &quot;&quot;&quot;
    Mixin for matching contexts.

    Class attributes:
    user            The user to match in the context.
    user_regex      If true, regular expression matching
                    will be used on the user.
    role            The role to match in the context.
    role_regex      If true, regular expression matching
                    will be used on the role.
    type_           The type to match in the context.
    type_regex      If true, regular expression matching
                    will be used on the type.
    range_          The range to match in the context.
    range_subset    If true, the criteria will match if it
                    is a subset of the context's range.
    range_overlap   If true, the criteria will match if it
                    overlaps any of the context's range.
    range_superset  If true, the criteria will match if it
                    is a superset of the context's range.
    range_proper    If true, use proper superset/subset
                    on range matching operations.
                    No effect if not using set operations.
    &quot;&quot;&quot;

    user = CriteriaDescriptor(&quot;user_regex&quot;, &quot;lookup_user&quot;)
    user_regex = False
    role = CriteriaDescriptor(&quot;role_regex&quot;, &quot;lookup_role&quot;)
    role_regex = False
    type_ = CriteriaDescriptor(&quot;type_regex&quot;, &quot;lookup_type&quot;)
    type_regex = False
    range_ = CriteriaDescriptor(lookup_function=&quot;lookup_range&quot;)
    range_overlap = False
    range_subset = False
    range_superset = False
    range_proper = False

    def _match_context_debug(self, log):
        &quot;&quot;&quot;Emit log debugging info for context matching.&quot;&quot;&quot;
        log.debug(&quot;User: {0.user!r}, regex: {0.user_regex}&quot;.format(self))
        log.debug(&quot;Role: {0.role!r}, regex: {0.role_regex}&quot;.format(self))
        log.debug(&quot;Type: {0.type_!r}, regex: {0.type_regex}&quot;.format(self))
        log.debug(&quot;Range: {0.range_!r}, subset: {0.range_subset}, overlap: {0.range_overlap}, &quot;
                  &quot;superset: {0.range_superset}, proper: {0.range_proper}&quot;.format(self))

    def _match_context(self, context):
        &quot;&quot;&quot;
        Match the context criteria.

        Parameter:
        obj     An object with context attributes &quot;user&quot;, &quot;role&quot;,
                &quot;type_&quot; and &quot;range_&quot;.
        &quot;&quot;&quot;

        if self.user and not match_regex(
                context.user,
                self.user,
                self.user_regex):
            return False

        if self.role and not match_regex(
                context.role,
                self.role,
                self.role_regex):
            return False

        if self.type_ and not match_regex(
                context.type_,
                self.type_,
                self.type_regex):
            return False

        if self.range_ and not match_range(
                context.range_,
                self.range_,
                self.range_subset,
                self.range_overlap,
                self.range_superset,
                self.range_proper):
            return False

        return True


class MatchName:

    &quot;&quot;&quot;Mixin for matching an object's name with alias dereferencing.&quot;&quot;&quot;

    name = CriteriaDescriptor(&quot;name_regex&quot;)
    name_regex = False
    alias_deref = False

    def _match_name_debug(self, log):
        &quot;&quot;&quot;Log debugging messages for name matching.&quot;&quot;&quot;
        log.debug(&quot;Name: {0.name!r}, regex: {0.name_regex}, deref: {0.alias_deref}&quot;.format(self))

    def _match_name(self, obj):
        &quot;&quot;&quot;Match the object to the name criteria.&quot;&quot;&quot;
        if not self.name:
            # if there is no criteria, everything matches.
            return True

        if self.alias_deref:
            return match_regex(obj, self.name, self.name_regex) or \
                match_in_set(obj.aliases(), self.name, self.name_regex)
        else:
            return match_regex(obj, self.name, self.name_regex)


class MatchObjClass:

    &quot;&quot;&quot;Mixin for matching an object's class.&quot;&quot;&quot;

    tclass = CriteriaSetDescriptor(&quot;tclass_regex&quot;, &quot;lookup_class&quot;)
    tclass_regex = False

    def _match_object_class_debug(self, log):
        &quot;&quot;&quot;Emit log debugging info for permission matching.&quot;&quot;&quot;
        log.debug(&quot;Class: {0.tclass!r}, regex: {0.tclass_regex}&quot;.format(self))

    def _match_object_class(self, obj):
        &quot;&quot;&quot;
        Match the object class criteria

        Parameter:
        obj     An object with an object class attribute named &quot;tclass&quot;
        &quot;&quot;&quot;

        if not self.tclass:
            # if there is no criteria, everything matches.
            return True
        elif self.tclass_regex:
            return bool(self.tclass.search(str(obj.tclass)))
        else:
            return obj.tclass in self.tclass


class MatchPermission:

    &quot;&quot;&quot;Mixin for matching an object's permissions.&quot;&quot;&quot;

    perms = CriteriaSetDescriptor(&quot;perms_regex&quot;)
    perms_equal = False
    perms_regex = False
    perms_subset = False

    def _match_perms_debug(self, log):
        &quot;&quot;&quot;Emit log debugging info for permission matching.&quot;&quot;&quot;
        log.debug(&quot;Perms: {0.perms!r}, regex: {0.perms_regex}, eq: {0.perms_equal}, &quot;
                  &quot;subset: {0.perms_subset!r}&quot;.format(self))

    def _match_perms(self, obj):
        &quot;&quot;&quot;
        Match the permission criteria

        Parameter:
        obj     An object with a permission set class attribute named &quot;perms&quot;
        &quot;&quot;&quot;

        if not self.perms:
            # if there is no criteria, everything matches.
            return True

        if self.perms_subset:
            return obj.perms &gt;= self.perms
        else:
            return match_regex_or_set(obj.perms, self.perms, self.perms_equal, self.perms_regex)
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