145 lines
5.5 KiB
Python
145 lines
5.5 KiB
Python
# Copyright (c) 2017 Fujitsu Limited
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron_lib import constants
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from oslo_log import log as logging
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from neutron_fwaas.privileged import netlink_lib as nl_lib
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from neutron_fwaas.services.firewall.service_drivers.agents.drivers import\
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conntrack_base
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LOG = logging.getLogger(__name__)
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class ConntrackNetlink(conntrack_base.ConntrackDriverBase):
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def initialize(self, *args, **kwargs):
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LOG.debug('Conntrack Netlink loaded')
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def flush_entries(self, namespace):
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"""Flush all conntrack entries within the namespace
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:param namespace: namespace to flush
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:return: None
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"""
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nl_lib.flush_entries(namespace)
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def delete_entries(self, rules, namespace):
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rule_filters = (self._get_filter_from_rule(r) for r in rules)
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rule_filters = sorted(rule_filters)
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entries = nl_lib.list_entries(namespace)
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delete_entries = self._get_entries_to_delete(rule_filters, entries)
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if delete_entries:
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nl_lib.delete_entries(delete_entries, namespace)
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def _get_entries_to_delete(self, rule_filters, entries):
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"""Specify conntrack entries to delete
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:param rule_filters: List of filters parsed from firewall rules
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:param entries: all entries within namespace
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:return: conntrack entries to delete
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"""
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# List all entries from namespace, they are already parsed
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# to a list of tuples:
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# [(4, 'icmp', 8, 0, '1.1.1.1', '2.2.2.2', 1234),
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# (4, 'tcp', 1, 2, '1.1.1.1', '2.2.2.2')]
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delete_entries = []
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entry_index = 0
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entry_number = len(entries)
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for rule_filter in rule_filters:
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while entry_index < entry_number:
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# Compare entry with rule
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comp = self._compare_entry_and_rule(rule_filter,
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entries[entry_index])
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# Increase entry_index when entry is under rule
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if comp < 0:
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entry_index += 1
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# Append entry to delete_entry if it matches with rule
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elif comp == 0:
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delete_entries.append(entries[entry_index])
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entry_index += 1
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# Switch to new higher rule
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else:
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break
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return delete_entries
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@staticmethod
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def _get_filter_from_rule(rule):
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"""Parse the firewall rule to a tuple
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:param rule: firewall rule
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:return: a tuple of parsed information
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"""
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rule_filter = []
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keys = ['ip_version', 'protocol',
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'source_port', 'destination_port',
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'source_ip_address', 'destination_ip_address']
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for key in keys:
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if key in ['source_port', 'destination_port']:
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port_range = rule.get(key, [])
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if port_range:
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port_lower, sep, port_upper = port_range.partition(':')
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port_upper = port_upper if sep else port_lower
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port_range = [port_lower, port_upper]
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rule_filter.append(port_range or [])
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else:
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rule_filter.append(rule.get(key, []))
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return tuple(rule_filter)
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@staticmethod
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def _compare_entry_and_rule(rule_filter, entry):
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"""Define that the entry should be deleted or not
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:param rule_filter: filter that is parsed from a firewall rule
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ex: (4, 'tcp', 1, 2)
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:param entry: parsed conntrack entry,
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ex: (4, 'tcp', 1, 2, '1.1.1.1', '2.2.2.2')
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:return: -1 if entry is lower than rule, 0 if entry matches rule,
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1 if entry is higher than rule
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"""
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ENTRY_IS_LOWER = -1
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ENTRY_MATCHES = 0
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ENTRY_IS_HIGHER = 1
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rule_ipversion = rule_filter[0]
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if entry[0] < rule_ipversion:
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return ENTRY_IS_LOWER
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elif entry[0] > rule_ipversion:
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return ENTRY_IS_HIGHER
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rule_protocol = rule_filter[1]
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if rule_protocol:
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if rule_protocol == constants.PROTO_NAME_IPV6_ICMP:
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rule_protocol = constants.PROTO_NAME_IPV6_ICMP_LEGACY
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if entry[1] < rule_protocol:
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return ENTRY_IS_LOWER
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elif entry[1] > rule_protocol:
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return ENTRY_IS_HIGHER
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sport_range = rule_filter[2]
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if sport_range:
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sport_range = [int(port) for port in sport_range]
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if entry[2] < min(sport_range[0], sport_range[-1]):
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return ENTRY_IS_LOWER
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elif entry[2] > max(sport_range[0], sport_range[-1]):
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return ENTRY_IS_HIGHER
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dport_range = rule_filter[3]
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if dport_range:
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dport_range = [int(port) for port in dport_range]
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if entry[3] < min(dport_range[0], dport_range[-1]):
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return ENTRY_IS_LOWER
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elif entry[3] > max(dport_range[0], dport_range[-1]):
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return ENTRY_IS_HIGHER
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return ENTRY_MATCHES
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