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# Copyright 2015, Tresys Technology, LLC
# Copyright 2019, Chris PeBenito <pebenito@ieee.org>
#
# SPDX-License-Identifier: LGPL-2.1-only
#
# pylint: disable=attribute-defined-outside-init,no-member
import re
from logging import Logger
from typing import Iterable
from .descriptors import CriteriaDescriptor, CriteriaSetDescriptor, CriteriaPermissionSetDescriptor
from .policyrep import Context
from .util import match_in_set, match_regex, match_range, match_regex_or_set
class MatchAlias:
"""Mixin for matching an object's aliases."""
alias = CriteriaDescriptor("alias_regex")
alias_regex: bool = False
def _match_alias_debug(self, log: Logger) -> None:
"""Emit log debugging info for alias matching."""
log.debug("Alias: {0.alias}, regex: {0.alias_regex}".format(self))
def _match_alias(self, obj):
"""
Match the alias criteria
Parameter:
obj An object with an alias generator method named "aliases"
"""
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:
"""
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.
"""
user = CriteriaDescriptor("user_regex", "lookup_user")
user_regex: bool = False
role = CriteriaDescriptor("role_regex", "lookup_role")
role_regex: bool = False
type_ = CriteriaDescriptor("type_regex", "lookup_type")
type_regex: bool = False
range_ = CriteriaDescriptor(lookup_function="lookup_range")
range_overlap: bool = False
range_subset: bool = False
range_superset: bool = False
range_proper: bool = False
def _match_context_debug(self, log: Logger):
"""Emit log debugging info for context matching."""
log.debug("User: {0.user!r}, regex: {0.user_regex}".format(self))
log.debug("Role: {0.role!r}, regex: {0.role_regex}".format(self))
log.debug("Type: {0.type_!r}, regex: {0.type_regex}".format(self))
log.debug("Range: {0.range_!r}, subset: {0.range_subset}, overlap: {0.range_overlap}, "
"superset: {0.range_superset}, proper: {0.range_proper}".format(self))
def _match_context(self, context: Context) -> bool:
"""
Match the context criteria.
Parameter:
obj An object with context attributes "user", "role",
"type_" and "range_".
"""
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:
"""Mixin for matching an object's name with alias dereferencing."""
name = CriteriaDescriptor("name_regex")
name_regex: bool = False
alias_deref: bool = False
def _match_name_debug(self, log: Logger) -> None:
"""Log debugging messages for name matching."""
log.debug("Name: {0.name!r}, regex: {0.name_regex}, deref: {0.alias_deref}".format(self))
def _match_name(self, obj):
"""Match the object to the name criteria."""
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:
"""Mixin for matching an object's class."""
tclass = CriteriaSetDescriptor("tclass_regex", "lookup_class")
tclass_regex: bool = False
def _match_object_class_debug(self, log: Logger) -> None:
"""Emit log debugging info for permission matching."""
log.debug("Class: {0.tclass!r}, regex: {0.tclass_regex}".format(self))
def _match_object_class(self, obj):
"""
Match the object class criteria
Parameter:
obj An object with an object class attribute named "tclass"
"""
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:
"""Mixin for matching an object's permissions."""
perms = CriteriaPermissionSetDescriptor(name_regex="perms_regex")
perms_equal: bool = False
perms_regex: bool = False
perms_subset: bool = False
def _match_perms_debug(self, log: Logger):
"""Emit log debugging info for permission matching."""
log.debug("Perms: {0.perms!r}, regex: {0.perms_regex}, eq: {0.perms_equal}, "
"subset: {0.perms_subset!r}".format(self))
def _match_perms(self, obj):
"""
Match the permission criteria
Parameter:
obj An object with a permission set class attribute named "perms"
"""
if not self.perms:
# if there is no criteria, everything matches.
return True
if self.perms_subset:
return obj.perms >= self.perms
else:
return match_regex_or_set(obj.perms, self.perms, self.perms_equal, self.perms_regex)