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# Copyright 2014-2015, Tresys Technology, LLC
# Copyright 2017, Chris PeBenito <pebenito@ieee.org>
#
# SPDX-License-Identifier: LGPL-2.1-only
#
import ipaddress
import logging
from socket import AF_INET, AF_INET6
from typing import Iterable, Optional, Union
from .mixins import MatchContext
from .policyrep import Nodecon, NodeconIPVersion
from .query import PolicyQuery
AnyIPNetwork = Union[ipaddress.IPv4Network, ipaddress.IPv6Network]
class NodeconQuery(MatchContext, PolicyQuery):
"""
Query nodecon statements.
Parameter:
policy The policy to query.
Keyword Parameters/Class attributes:
network The IPv4/IPv6 address or IPv4/IPv6 network address
with netmask, e.g. 192.168.1.0/255.255.255.0 or
"192.168.1.0/24".
network_overlap If true, the net will match if it overlaps with
the nodecon's network instead of equality.
ip_version The IP version of the nodecon to match. (socket.AF_INET
for IPv4 or socket.AF_INET6 for IPv6)
user The criteria to match the context's user.
user_regex If true, regular expression matching
will be used on the user.
role The criteria to match the context's role.
role_regex If true, regular expression matching
will be used on the role.
type_ The criteria to match the context's type.
type_regex If true, regular expression matching
will be used on the type.
range_ The criteria to match the context's range.
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 operations.
No effect if not using set operations.
"""
_network: Optional[AnyIPNetwork] = None
network_overlap: bool = False
_ip_version: Optional[NodeconIPVersion] = None
@property
def ip_version(self) -> Optional[NodeconIPVersion]:
return self._ip_version
@ip_version.setter
def ip_version(self, value: Optional[Union[str, NodeconIPVersion]]) -> None:
if value:
self._ip_version = NodeconIPVersion.lookup(value)
else:
self._ip_version = None
@property
def network(self) -> Optional[AnyIPNetwork]:
return self._network
@network.setter
def network(self, value: Optional[Union[str, AnyIPNetwork]]) -> None:
if value:
self._network = ipaddress.ip_network(value)
else:
self._network = None
def __init__(self, policy, **kwargs) -> None:
super(NodeconQuery, self).__init__(policy, **kwargs)
self.log = logging.getLogger(__name__)
def results(self) -> Iterable[Nodecon]:
"""Generator which yields all matching nodecons."""
self.log.info("Generating nodecon results from {0.policy}".format(self))
self.log.debug("Network: {0.network!r}, overlap: {0.network_overlap}".format(self))
self.log.debug("IP Version: {0.ip_version!r}".format(self))
self._match_context_debug(self.log)
for nodecon in self.policy.nodecons():
if self.network:
if self.network_overlap:
if not self.network.overlaps(nodecon.network): # type: ignore
continue
else:
if not nodecon.network == self.network:
continue
if self.ip_version and self.ip_version != nodecon.ip_version:
continue
if not self._match_context(nodecon.context):
continue
yield nodecon
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