1029 lines
46 KiB
Python
1029 lines
46 KiB
Python
# Copyright 2012, Nachi Ueno, NTT MCL, Inc.
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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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import collections
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import ctypes
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from ctypes import util
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import sys
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import netaddr
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from neutron_lib import constants
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from neutron_lib.utils import helpers
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_utils import netutils
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from neutron.agent import firewall
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from neutron.agent.linux import ip_conntrack
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from neutron.agent.linux import ipset_manager
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from neutron.agent.linux import iptables_comments as ic
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from neutron.agent.linux import iptables_manager
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from neutron.agent.linux import utils as a_utils
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from neutron.common import _constants as const
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from neutron.common import utils as c_utils
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LOG = logging.getLogger(__name__)
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SG_CHAIN = 'sg-chain'
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SPOOF_FILTER = 'spoof-filter'
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CHAIN_NAME_PREFIX = {constants.INGRESS_DIRECTION: 'i',
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constants.EGRESS_DIRECTION: 'o',
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SPOOF_FILTER: 's'}
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IPSET_DIRECTION = {constants.INGRESS_DIRECTION: 'src',
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constants.EGRESS_DIRECTION: 'dst'}
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comment_rule = iptables_manager.comment_rule
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libc = ctypes.CDLL(util.find_library('libc.so.6'))
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def get_hybrid_port_name(port_name):
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return (constants.TAP_DEVICE_PREFIX + port_name)[:constants.LINUX_DEV_LEN]
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class mac_iptables(netaddr.mac_eui48):
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"""mac format class for netaddr to match iptables representation."""
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word_sep = ':'
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class IptablesFirewallDriver(firewall.FirewallDriver):
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"""Driver which enforces security groups through iptables rules."""
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IPTABLES_DIRECTION = {constants.INGRESS_DIRECTION: 'physdev-out',
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constants.EGRESS_DIRECTION: 'physdev-in'}
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CONNTRACK_ZONE_PER_PORT = False
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def __init__(self, namespace=None):
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self.iptables = iptables_manager.IptablesManager(
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state_less=True,
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use_ipv6=netutils.is_ipv6_enabled(),
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namespace=namespace)
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# TODO(majopela, shihanzhang): refactor out ipset to a separate
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# driver composed over this one
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self.ipset = ipset_manager.IpsetManager(namespace=namespace)
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# list of port which has security group
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self.filtered_ports = {}
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self.unfiltered_ports = {}
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self.trusted_ports = []
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self.ipconntrack = ip_conntrack.get_conntrack(
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self.iptables.get_rules_for_table, self.filtered_ports,
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self.unfiltered_ports, namespace=namespace,
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zone_per_port=self.CONNTRACK_ZONE_PER_PORT)
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self._add_fallback_chain_v4v6()
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self._defer_apply = False
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self._pre_defer_filtered_ports = None
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self._pre_defer_unfiltered_ports = None
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# List of security group rules for ports residing on this host
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self.sg_rules = {}
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self.pre_sg_rules = None
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# List of security group member ips for ports residing on this host
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self.sg_members = collections.defaultdict(
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lambda: collections.defaultdict(list))
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self.pre_sg_members = None
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self.enable_ipset = cfg.CONF.SECURITYGROUP.enable_ipset
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self.updated_rule_sg_ids = set()
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self.updated_sg_members = set()
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self.devices_with_updated_sg_members = collections.defaultdict(list)
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self._iptables_protocol_name_map = {}
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self._check_netfilter_for_bridges()
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@staticmethod
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def _check_netfilter_for_bridges():
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"""Check if br_netfilter is loaded and the needed flags for IPtables"""
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log_warning = False
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if not a_utils.execute(
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['sysctl', '-N', 'net.bridge'], run_as_root=True,
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log_fail_as_error=False, check_exit_code=False,
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privsep_exec=True):
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LOG.warning('Kernel module br_netfilter is not loaded.')
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log_warning = True
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if not log_warning:
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for proto in ('arp', 'ip', 'ip6'):
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key = 'net.bridge.bridge-nf-call-%stables' % proto
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enabled = a_utils.execute(
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['sysctl', '-b', key], run_as_root=True,
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log_fail_as_error=False, check_exit_code=False,
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privsep_exec=True)
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if enabled == '1':
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status = 'enabled'
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log_method = LOG.debug
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else:
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status = 'disabled'
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log_method = LOG.warning
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log_warning = True
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log_method('Key %(key)s is %(status)s',
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{'key': key, 'status': status})
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if log_warning:
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LOG.warning('Please ensure that netfilter options for bridge are '
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'enabled to provide working security groups.')
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@property
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def ports(self):
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return dict(self.filtered_ports, **self.unfiltered_ports)
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def _update_remote_security_group_members(self, sec_group_ids):
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for sg_id in sec_group_ids:
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for device in self.filtered_ports.values():
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if sg_id in device.get('security_group_source_groups', []):
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self.devices_with_updated_sg_members[sg_id].append(device)
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def security_group_updated(self, action_type, sec_group_ids,
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device_ids=None):
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device_ids = device_ids or []
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if action_type == 'sg_rule':
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self.updated_rule_sg_ids.update(sec_group_ids)
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elif action_type == 'sg_member':
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if device_ids:
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self.updated_sg_members.update(device_ids)
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else:
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self._update_remote_security_group_members(sec_group_ids)
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def process_trusted_ports(self, port_ids):
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"""Process ports that are trusted and shouldn't be filtered."""
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for port in port_ids:
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if port not in self.trusted_ports:
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jump_rule = self._generate_trusted_port_rules(port)
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self._add_rules_to_chain_v4v6(
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'FORWARD', jump_rule, jump_rule, comment=ic.TRUSTED_ACCEPT)
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self.trusted_ports.append(port)
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def remove_trusted_ports(self, port_ids):
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for port in port_ids:
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if port in self.trusted_ports:
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jump_rule = self._generate_trusted_port_rules(port)
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self._remove_rule_from_chain_v4v6(
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'FORWARD', jump_rule, jump_rule)
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self.trusted_ports.remove(port)
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def _generate_trusted_port_rules(self, port):
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rt = '-m physdev --%%s %s --physdev-is-bridged -j ACCEPT' % (
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self._get_device_name(port))
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return [rt % (self.IPTABLES_DIRECTION[constants.INGRESS_DIRECTION]),
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rt % (self.IPTABLES_DIRECTION[constants.EGRESS_DIRECTION])]
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def update_security_group_rules(self, sg_id, sg_rules):
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LOG.debug("Update rules of security group (%s)", sg_id)
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self.sg_rules[sg_id] = sg_rules
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def update_security_group_members(self, sg_id, sg_members):
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LOG.debug("Update members of security group (%s)", sg_id)
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self.sg_members[sg_id] = collections.defaultdict(list, sg_members)
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if self.enable_ipset:
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self._update_ipset_members(sg_id, sg_members)
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def _update_ipset_members(self, sg_id, sg_members):
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devices = self.devices_with_updated_sg_members.pop(sg_id, None)
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for ip_version, current_ips in sg_members.items():
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add_ips, del_ips = self.ipset.set_members(
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sg_id, ip_version, current_ips)
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if devices and del_ips:
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# remove prefix from del_ips
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ips = [str(netaddr.IPNetwork(del_ip).ip) for del_ip in del_ips]
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self.ipconntrack.delete_conntrack_state_by_remote_ips(
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devices, ip_version, ips)
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def _set_ports(self, port):
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if not firewall.port_sec_enabled(port):
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self.unfiltered_ports[port['device']] = port
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self.filtered_ports.pop(port['device'], None)
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else:
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self.filtered_ports[port['device']] = port
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self.unfiltered_ports.pop(port['device'], None)
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def _unset_ports(self, port):
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self.unfiltered_ports.pop(port['device'], None)
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self.filtered_ports.pop(port['device'], None)
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def _remove_conntrack_entries_from_port_deleted(self, port):
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device_info = self.filtered_ports.get(port['device'])
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if not device_info:
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return
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for ethertype in [constants.IPv4, constants.IPv6]:
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self.ipconntrack.delete_conntrack_state_by_remote_ips(
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[device_info], ethertype, set())
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def prepare_port_filter(self, port):
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LOG.debug("Preparing device (%s) filter", port['device'])
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self._set_ports(port)
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# each security group has it own chains
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self._setup_chains()
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return self.iptables.apply()
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def update_port_filter(self, port):
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LOG.debug("Updating device (%s) filter", port['device'])
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if port['device'] not in self.ports:
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LOG.info('Attempted to update port filter which is not '
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'filtered %s', port['device'])
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return
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self._remove_chains()
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self._set_ports(port)
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self._setup_chains()
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return self.iptables.apply()
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def remove_port_filter(self, port):
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LOG.debug("Removing device (%s) filter", port['device'])
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if port['device'] not in self.ports:
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LOG.info('Attempted to remove port filter which is not '
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'filtered %r', port)
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return
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self._remove_chains()
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self._remove_conntrack_entries_from_port_deleted(port)
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self._unset_ports(port)
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self._setup_chains()
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return self.iptables.apply()
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def _add_accept_rule_port_sec(self, port, direction):
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self._update_port_sec_rules(port, direction, add=True)
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def _remove_rule_port_sec(self, port, direction):
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self._update_port_sec_rules(port, direction, add=False)
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def _remove_rule_from_chain_v4v6(self, chain_name, ipv4_rules, ipv6_rules):
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for rule in ipv4_rules:
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self.iptables.ipv4['filter'].remove_rule(chain_name, rule)
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for rule in ipv6_rules:
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self.iptables.ipv6['filter'].remove_rule(chain_name, rule)
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def _setup_chains(self):
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"""Setup ingress and egress chain for a port."""
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if not self._defer_apply:
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self._setup_chains_apply(self.filtered_ports,
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self.unfiltered_ports)
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def _setup_chains_apply(self, ports, unfiltered_ports):
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self._add_chain_by_name_v4v6(SG_CHAIN)
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# sort by port so we always do this deterministically between
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# agent restarts and don't cause unnecessary rule differences
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for pname in sorted(ports):
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port = ports[pname]
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self._add_conntrack_jump(port)
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self._setup_chain(port, constants.INGRESS_DIRECTION)
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self._setup_chain(port, constants.EGRESS_DIRECTION)
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self.iptables.ipv4['filter'].add_rule(SG_CHAIN, '-j ACCEPT')
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self.iptables.ipv6['filter'].add_rule(SG_CHAIN, '-j ACCEPT')
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for port in unfiltered_ports.values():
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self._add_accept_rule_port_sec(port, constants.INGRESS_DIRECTION)
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self._add_accept_rule_port_sec(port, constants.EGRESS_DIRECTION)
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def _remove_chains(self):
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"""Remove ingress and egress chain for a port."""
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if not self._defer_apply:
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self._remove_chains_apply(self.filtered_ports,
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self.unfiltered_ports)
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def _remove_chains_apply(self, ports, unfiltered_ports):
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for port in ports.values():
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self._remove_chain(port, constants.INGRESS_DIRECTION)
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self._remove_chain(port, constants.EGRESS_DIRECTION)
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self._remove_chain(port, SPOOF_FILTER)
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self._remove_conntrack_jump(port)
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for port in unfiltered_ports.values():
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self._remove_rule_port_sec(port, constants.INGRESS_DIRECTION)
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self._remove_rule_port_sec(port, constants.EGRESS_DIRECTION)
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self._remove_chain_by_name_v4v6(SG_CHAIN)
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def _setup_chain(self, port, DIRECTION):
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self._add_chain(port, DIRECTION)
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self._add_rules_by_security_group(port, DIRECTION)
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def _remove_chain(self, port, DIRECTION):
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chain_name = self._port_chain_name(port, DIRECTION)
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self._remove_chain_by_name_v4v6(chain_name)
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def _add_fallback_chain_v4v6(self):
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self.iptables.ipv4['filter'].add_chain('sg-fallback')
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self.iptables.ipv4['filter'].add_rule('sg-fallback', '-j DROP',
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comment=ic.UNMATCH_DROP)
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self.iptables.ipv6['filter'].add_chain('sg-fallback')
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self.iptables.ipv6['filter'].add_rule('sg-fallback', '-j DROP',
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comment=ic.UNMATCH_DROP)
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def _add_chain_by_name_v4v6(self, chain_name):
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self.iptables.ipv4['filter'].add_chain(chain_name)
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self.iptables.ipv6['filter'].add_chain(chain_name)
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def _remove_chain_by_name_v4v6(self, chain_name):
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self.iptables.ipv4['filter'].remove_chain(chain_name)
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self.iptables.ipv6['filter'].remove_chain(chain_name)
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def _add_rules_to_chain_v4v6(self, chain_name, ipv4_rules, ipv6_rules,
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top=False, comment=None):
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for rule in ipv4_rules:
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self.iptables.ipv4['filter'].add_rule(chain_name, rule,
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top=top, comment=comment)
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for rule in ipv6_rules:
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self.iptables.ipv6['filter'].add_rule(chain_name, rule,
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top=top, comment=comment)
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def _get_device_name(self, port):
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if not isinstance(port, dict):
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return port
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return port['device']
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def _update_port_sec_rules(self, port, direction, add=False):
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# add/remove rules in FORWARD and INPUT chain
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device = self._get_device_name(port)
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jump_rule = ['-m physdev --%s %s --physdev-is-bridged '
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'-j ACCEPT' % (self.IPTABLES_DIRECTION[direction],
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device)]
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if add:
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self._add_rules_to_chain_v4v6(
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'FORWARD', jump_rule, jump_rule, comment=ic.PORT_SEC_ACCEPT)
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else:
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self._remove_rule_from_chain_v4v6('FORWARD', jump_rule, jump_rule)
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if direction == constants.EGRESS_DIRECTION:
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if add:
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self._add_rules_to_chain_v4v6('INPUT', jump_rule, jump_rule,
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comment=ic.PORT_SEC_ACCEPT)
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else:
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self._remove_rule_from_chain_v4v6(
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'INPUT', jump_rule, jump_rule)
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def _add_chain(self, port, direction):
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chain_name = self._port_chain_name(port, direction)
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self._add_chain_by_name_v4v6(chain_name)
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# Note(nati) jump to the security group chain (SG_CHAIN)
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# This is needed because the packet may much two rule in port
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# if the two port is in the same host
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# We accept the packet at the end of SG_CHAIN.
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# jump to the security group chain
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device = self._get_device_name(port)
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jump_rule = ['-m physdev --%s %s --physdev-is-bridged '
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'-j $%s' % (self.IPTABLES_DIRECTION[direction],
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device,
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SG_CHAIN)]
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# Security group chain has to be applied before unfiltered
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# or trusted ports
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self._add_rules_to_chain_v4v6('FORWARD', jump_rule, jump_rule,
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top=True, comment=ic.VM_INT_SG)
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# jump to the chain based on the device
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jump_rule = ['-m physdev --%s %s --physdev-is-bridged '
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'-j $%s' % (self.IPTABLES_DIRECTION[direction],
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device,
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chain_name)]
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self._add_rules_to_chain_v4v6(SG_CHAIN, jump_rule, jump_rule,
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comment=ic.SG_TO_VM_SG)
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if direction == constants.EGRESS_DIRECTION:
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self._add_rules_to_chain_v4v6('INPUT', jump_rule, jump_rule,
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comment=ic.INPUT_TO_SG)
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def _get_br_device_name(self, port):
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return ('brq' + port['network_id'])[:constants.LINUX_DEV_LEN]
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def _get_port_device_name(self, port):
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if port['device'].startswith(constants.TAP_DEVICE_PREFIX):
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return port['device'][4:]
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return port['device']
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def _get_jump_rules(self, port, create=True):
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zone = self.ipconntrack.get_device_zone(port, create=create)
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if not zone:
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return []
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br_dev = self._get_br_device_name(port)
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port_dev = self._get_device_name(port)
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# match by interface for bridge input
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match_interface = '-i %s'
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match_physdev = '-m physdev --physdev-in %s'
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port_sg_rules = self._get_port_sg_rules(port)
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if self._are_sg_rules_stateful(port_sg_rules):
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# comment to prevent duplicate warnings for different devices using
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# same bridge. truncate start to remove prefixes
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comment = 'Set zone for %s' % self._get_port_device_name(port)
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conntrack = '--zone %s' % self.ipconntrack.get_device_zone(port)
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else:
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comment = 'Make %s stateless' % self._get_port_device_name(port)
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conntrack = '--notrack'
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rules = []
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for dev, match in ((br_dev, match_physdev), (br_dev, match_interface),
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(port_dev, match_physdev)):
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match = match % dev
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rule = '%s -m comment --comment "%s" -j CT %s' % (match, comment,
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conntrack)
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rules.append(rule)
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return rules
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def _get_port_sg_rules(self, port):
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port_sg_rules = []
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if not any(port.get('device_owner', '').startswith(prefix)
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for prefix in constants.DEVICE_OWNER_PREFIXES):
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port_sg_ids = port.get('security_groups', [])
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if port_sg_ids:
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for rule in self.sg_rules.get(port_sg_ids[0], []):
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if self.enable_ipset:
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port_sg_rules.append(rule)
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break
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port_sg_rules.extend(
|
|
self._expand_sg_rule_with_remote_ips(
|
|
rule, port, constants.INGRESS_DIRECTION))
|
|
if port_sg_rules:
|
|
break
|
|
port_sg_rules.extend(
|
|
self._expand_sg_rule_with_remote_ips(
|
|
rule, port, constants.EGRESS_DIRECTION))
|
|
if port_sg_rules:
|
|
break
|
|
return port_sg_rules
|
|
|
|
@staticmethod
|
|
def _are_sg_rules_stateful(security_group_rules):
|
|
for rule in security_group_rules:
|
|
return rule.get('stateful', True)
|
|
return True
|
|
|
|
def _add_conntrack_jump(self, port):
|
|
for jump_rule in self._get_jump_rules(port):
|
|
self._add_raw_rule('PREROUTING', jump_rule)
|
|
|
|
def _remove_conntrack_jump(self, port):
|
|
for jump_rule in self._get_jump_rules(port, create=False):
|
|
self._remove_raw_rule('PREROUTING', jump_rule)
|
|
|
|
def _add_raw_rule(self, chain, rule, comment=None):
|
|
self.iptables.ipv4['raw'].add_rule(chain, rule, comment=comment)
|
|
self.iptables.ipv6['raw'].add_rule(chain, rule, comment=comment)
|
|
|
|
def _remove_raw_rule(self, chain, rule):
|
|
self.iptables.ipv4['raw'].remove_rule(chain, rule)
|
|
self.iptables.ipv6['raw'].remove_rule(chain, rule)
|
|
|
|
def _split_sgr_by_ethertype(self, security_group_rules):
|
|
ipv4_sg_rules = []
|
|
ipv6_sg_rules = []
|
|
for rule in security_group_rules:
|
|
if rule.get('ethertype') == constants.IPv4:
|
|
ipv4_sg_rules.append(rule)
|
|
elif rule.get('ethertype') == constants.IPv6:
|
|
if rule.get('protocol') in const.IPV6_ICMP_LEGACY_PROTO_LIST:
|
|
rule['protocol'] = constants.PROTO_NAME_IPV6_ICMP
|
|
ipv6_sg_rules.append(rule)
|
|
return ipv4_sg_rules, ipv6_sg_rules
|
|
|
|
def _select_sgr_by_direction(self, port, direction):
|
|
return [rule
|
|
for rule in port.get('security_group_rules', [])
|
|
if rule['direction'] == direction]
|
|
|
|
def _setup_spoof_filter_chain(self, port, table, mac_ip_pairs, rules):
|
|
if mac_ip_pairs:
|
|
chain_name = self._port_chain_name(port, SPOOF_FILTER)
|
|
table.add_chain(chain_name)
|
|
for mac, ip in mac_ip_pairs:
|
|
if ip is None:
|
|
# If fixed_ips is [] this rule will be added to the end
|
|
# of the list after the allowed_address_pair rules.
|
|
table.add_rule(chain_name,
|
|
'-m mac --mac-source %s -j RETURN'
|
|
% mac.upper(), comment=ic.PAIR_ALLOW)
|
|
else:
|
|
# we need to convert it into a prefix to match iptables
|
|
ip = c_utils.ip_to_cidr(ip)
|
|
table.add_rule(chain_name,
|
|
'-s %s -m mac --mac-source %s -j RETURN'
|
|
% (ip, mac.upper()), comment=ic.PAIR_ALLOW)
|
|
table.add_rule(chain_name, '-j DROP', comment=ic.PAIR_DROP)
|
|
rules.append('-j $%s' % chain_name)
|
|
|
|
def _build_ipv4v6_mac_ip_list(self, mac, ip_address, mac_ipv4_pairs,
|
|
mac_ipv6_pairs):
|
|
mac = str(netaddr.EUI(mac, dialect=mac_iptables))
|
|
if netaddr.IPNetwork(ip_address).version == 4:
|
|
mac_ipv4_pairs.append((mac, ip_address))
|
|
else:
|
|
mac_ipv6_pairs.append((mac, ip_address))
|
|
lla = str(netutils.get_ipv6_addr_by_EUI64(
|
|
constants.IPv6_LLA_PREFIX, mac))
|
|
if (mac, lla) not in mac_ipv6_pairs:
|
|
# only add once so we don't generate duplicate rules
|
|
mac_ipv6_pairs.append((mac, lla))
|
|
|
|
def _spoofing_rule(self, port, ipv4_rules, ipv6_rules):
|
|
# Fixed rules for traffic sourced from unspecified addresses: 0.0.0.0
|
|
# and ::
|
|
# Allow dhcp client discovery and request
|
|
ipv4_rules += [comment_rule('-s 0.0.0.0/32 -d 255.255.255.255/32 '
|
|
'-p udp -m udp --sport 68 --dport 67 '
|
|
'-j RETURN', comment=ic.DHCP_CLIENT)]
|
|
# Allow neighbor solicitation and multicast listener discovery
|
|
# from the unspecified address for duplicate address detection
|
|
for icmp6_type in constants.ICMPV6_ALLOWED_UNSPEC_ADDR_TYPES:
|
|
ipv6_rules += [comment_rule('-s ::/128 -d ff02::/16 '
|
|
'-p ipv6-icmp -m icmp6 '
|
|
'--icmpv6-type %s -j RETURN' %
|
|
icmp6_type,
|
|
comment=ic.IPV6_ICMP_ALLOW)]
|
|
mac_ipv4_pairs = []
|
|
mac_ipv6_pairs = []
|
|
|
|
if isinstance(port.get('allowed_address_pairs'), list):
|
|
for address_pair in port['allowed_address_pairs']:
|
|
self._build_ipv4v6_mac_ip_list(address_pair['mac_address'],
|
|
address_pair['ip_address'],
|
|
mac_ipv4_pairs,
|
|
mac_ipv6_pairs)
|
|
|
|
for ip in port['fixed_ips']:
|
|
self._build_ipv4v6_mac_ip_list(port['mac_address'], ip,
|
|
mac_ipv4_pairs, mac_ipv6_pairs)
|
|
if not port['fixed_ips']:
|
|
mac_ipv4_pairs.append((port['mac_address'], None))
|
|
mac_ipv6_pairs.append((port['mac_address'], None))
|
|
|
|
self._setup_spoof_filter_chain(port, self.iptables.ipv4['filter'],
|
|
mac_ipv4_pairs, ipv4_rules)
|
|
self._setup_spoof_filter_chain(port, self.iptables.ipv6['filter'],
|
|
mac_ipv6_pairs, ipv6_rules)
|
|
# Fixed rules for traffic after source address is verified
|
|
# Allow dhcp client renewal and rebinding
|
|
ipv4_rules += [comment_rule('-p udp -m udp --sport 68 --dport 67 '
|
|
'-j RETURN', comment=ic.DHCP_CLIENT)]
|
|
# Drop Router Advts from the port.
|
|
ipv6_rules += [comment_rule('-p ipv6-icmp -m icmp6 --icmpv6-type %s '
|
|
'-j DROP' % constants.ICMPV6_TYPE_RA,
|
|
comment=ic.IPV6_RA_DROP)]
|
|
ipv6_rules += [comment_rule('-p ipv6-icmp -j RETURN',
|
|
comment=ic.IPV6_ICMP_ALLOW)]
|
|
ipv6_rules += [comment_rule('-p udp -m udp --sport 546 '
|
|
'--dport 547 '
|
|
'-j RETURN', comment=ic.DHCP_CLIENT)]
|
|
|
|
def _drop_dhcp_rule(self, ipv4_rules, ipv6_rules):
|
|
# Note(nati) Drop dhcp packet from VM
|
|
ipv4_rules += [comment_rule('-p udp -m udp --sport 67 '
|
|
'--dport 68 '
|
|
'-j DROP', comment=ic.DHCP_SPOOF)]
|
|
ipv6_rules += [comment_rule('-p udp -m udp --sport 547 '
|
|
'--dport 546 '
|
|
'-j DROP', comment=ic.DHCP_SPOOF)]
|
|
|
|
def _accept_inbound_icmpv6(self):
|
|
# Allow multicast listener, neighbor solicitation and
|
|
# neighbor advertisement into the instance
|
|
icmpv6_rules = []
|
|
for icmp6_type in firewall.ICMPV6_ALLOWED_INGRESS_TYPES:
|
|
icmpv6_rules += ['-p ipv6-icmp -m icmp6 --icmpv6-type %s '
|
|
'-j RETURN' % icmp6_type]
|
|
return icmpv6_rules
|
|
|
|
def _select_sg_rules_for_port(self, port, direction):
|
|
"""Select rules from the security groups the port is member of."""
|
|
port_sg_ids = port.get('security_groups', [])
|
|
port_rules = []
|
|
|
|
for sg_id in port_sg_ids:
|
|
for rule in self.sg_rules.get(sg_id, []):
|
|
if rule['direction'] == direction:
|
|
if self.enable_ipset:
|
|
port_rules.append(rule)
|
|
else:
|
|
port_rules.extend(
|
|
self._expand_sg_rule_with_remote_ips(
|
|
rule, port, direction))
|
|
return port_rules
|
|
|
|
def _expand_sg_rule_with_remote_ips(self, rule, port, direction):
|
|
"""Expand a remote group rule to rule per remote group IP."""
|
|
remote_group_id = rule.get('remote_group_id')
|
|
if remote_group_id:
|
|
ethertype = rule['ethertype']
|
|
port_ips = port.get('fixed_ips', [])
|
|
|
|
for ip, _mac in self.sg_members[remote_group_id][ethertype]:
|
|
if ip not in port_ips:
|
|
ip_rule = rule.copy()
|
|
direction_ip_prefix = firewall.DIRECTION_IP_PREFIX[
|
|
direction]
|
|
ip_prefix = str(netaddr.IPNetwork(ip).cidr)
|
|
ip_rule[direction_ip_prefix] = ip_prefix
|
|
yield ip_rule
|
|
else:
|
|
yield rule
|
|
|
|
def _get_remote_sg_ids(self, port, direction=None):
|
|
sg_ids = port.get('security_groups', [])
|
|
remote_sg_ids = {constants.IPv4: set(), constants.IPv6: set()}
|
|
for sg_id in sg_ids:
|
|
for rule in self.sg_rules.get(sg_id, []):
|
|
if not direction or rule['direction'] == direction:
|
|
remote_sg_id = rule.get('remote_group_id')
|
|
ether_type = rule.get('ethertype')
|
|
if remote_sg_id and ether_type:
|
|
remote_sg_ids[ether_type].add(remote_sg_id)
|
|
return remote_sg_ids
|
|
|
|
def _add_rules_by_security_group(self, port, direction):
|
|
# select rules for current port and direction
|
|
security_group_rules = self._select_sgr_by_direction(port, direction)
|
|
security_group_rules += self._select_sg_rules_for_port(port, direction)
|
|
# split groups by ip version
|
|
# for ipv4, iptables command is used
|
|
# for ipv6, iptables6 command is used
|
|
ipv4_sg_rules, ipv6_sg_rules = self._split_sgr_by_ethertype(
|
|
security_group_rules)
|
|
ipv4_iptables_rules = []
|
|
ipv6_iptables_rules = []
|
|
# include fixed egress/ingress rules
|
|
if direction == constants.EGRESS_DIRECTION:
|
|
self._add_fixed_egress_rules(port,
|
|
ipv4_iptables_rules,
|
|
ipv6_iptables_rules)
|
|
elif direction == constants.INGRESS_DIRECTION:
|
|
ipv6_iptables_rules += self._accept_inbound_icmpv6()
|
|
# include IPv4 and IPv6 iptable rules from security group
|
|
ipv4_iptables_rules += self._convert_sgr_to_iptables_rules(
|
|
ipv4_sg_rules)
|
|
ipv6_iptables_rules += self._convert_sgr_to_iptables_rules(
|
|
ipv6_sg_rules)
|
|
# finally add the rules to the port chain for a given direction
|
|
self._add_rules_to_chain_v4v6(self._port_chain_name(port, direction),
|
|
ipv4_iptables_rules,
|
|
ipv6_iptables_rules)
|
|
|
|
def _add_fixed_egress_rules(self, port, ipv4_iptables_rules,
|
|
ipv6_iptables_rules):
|
|
self._spoofing_rule(port,
|
|
ipv4_iptables_rules,
|
|
ipv6_iptables_rules)
|
|
self._drop_dhcp_rule(ipv4_iptables_rules, ipv6_iptables_rules)
|
|
|
|
def _generate_ipset_rule_args(self, sg_rule, remote_gid):
|
|
ethertype = sg_rule.get('ethertype')
|
|
ipset_name = self.ipset.get_name(remote_gid, ethertype)
|
|
if not self.ipset.set_name_exists(ipset_name):
|
|
# NOTE(mangelajo): ipsets for empty groups are not created
|
|
# thus we can't reference them.
|
|
return None
|
|
ipset_direction = IPSET_DIRECTION[sg_rule.get('direction')]
|
|
args = self._generate_protocol_and_port_args(sg_rule)
|
|
args += ['-m set', '--match-set', ipset_name, ipset_direction]
|
|
args += ['-j RETURN']
|
|
return args
|
|
|
|
def _generate_protocol_and_port_args(self, sg_rule):
|
|
is_port = (sg_rule.get('source_port_range_min') is not None or
|
|
sg_rule.get('port_range_min') is not None)
|
|
args = self._protocol_arg(sg_rule.get('protocol'), is_port)
|
|
args += self._port_arg('sport',
|
|
sg_rule.get('protocol'),
|
|
sg_rule.get('source_port_range_min'),
|
|
sg_rule.get('source_port_range_max'))
|
|
args += self._port_arg('dport',
|
|
sg_rule.get('protocol'),
|
|
sg_rule.get('port_range_min'),
|
|
sg_rule.get('port_range_max'))
|
|
return args
|
|
|
|
def _generate_plain_rule_args(self, sg_rule):
|
|
# These arguments MUST be in the format iptables-save will
|
|
# display them: source/dest, protocol, sport, dport, target
|
|
# Otherwise the iptables_manager code won't be able to find
|
|
# them to preserve their [packet:byte] counts.
|
|
args = self._ip_prefix_arg('s', sg_rule.get('source_ip_prefix'))
|
|
args += self._ip_prefix_arg('d', sg_rule.get('dest_ip_prefix'))
|
|
args += self._generate_protocol_and_port_args(sg_rule)
|
|
args += ['-j RETURN']
|
|
return args
|
|
|
|
def _convert_sg_rule_to_iptables_args(self, sg_rule):
|
|
remote_gid = sg_rule.get('remote_group_id')
|
|
if self.enable_ipset and remote_gid:
|
|
return self._generate_ipset_rule_args(sg_rule, remote_gid)
|
|
else:
|
|
return self._generate_plain_rule_args(sg_rule)
|
|
|
|
def _convert_sgr_to_iptables_rules(self, security_group_rules):
|
|
iptables_rules = []
|
|
self._allow_established(iptables_rules)
|
|
seen_sg_rules = set()
|
|
for rule in security_group_rules:
|
|
args = self._convert_sg_rule_to_iptables_args(rule)
|
|
if args:
|
|
rule_command = ' '.join(args)
|
|
if rule_command in seen_sg_rules:
|
|
# since these rules are from multiple security groups,
|
|
# there may be duplicates so we prune them out here
|
|
continue
|
|
seen_sg_rules.add(rule_command)
|
|
iptables_rules.append(rule_command)
|
|
|
|
self._drop_invalid_packets(iptables_rules)
|
|
iptables_rules += [comment_rule('-j $sg-fallback',
|
|
comment=ic.UNMATCHED)]
|
|
return iptables_rules
|
|
|
|
def _drop_invalid_packets(self, iptables_rules):
|
|
# Always drop invalid packets
|
|
iptables_rules += [comment_rule('-m state --state ' 'INVALID -j DROP',
|
|
comment=ic.INVALID_DROP)]
|
|
return iptables_rules
|
|
|
|
def _allow_established(self, iptables_rules):
|
|
# Allow established connections
|
|
iptables_rules += [comment_rule(
|
|
'-m state --state RELATED,ESTABLISHED -j RETURN',
|
|
comment=ic.ALLOW_ASSOC)]
|
|
return iptables_rules
|
|
|
|
def _local_protocol_name_map(self):
|
|
local_protocol_name_map = {}
|
|
try:
|
|
class protoent(ctypes.Structure):
|
|
_fields_ = [("p_name", ctypes.c_char_p),
|
|
("p_aliases", ctypes.POINTER(ctypes.c_char_p)),
|
|
("p_proto", ctypes.c_int)]
|
|
libc.getprotoent.restype = ctypes.POINTER(protoent)
|
|
libc.setprotoent(0)
|
|
while True:
|
|
pr = libc.getprotoent()
|
|
if not pr:
|
|
break
|
|
r = pr[0]
|
|
p_name = helpers.safe_decode_utf8(r.p_name)
|
|
local_protocol_name_map[str(r.p_proto)] = p_name
|
|
except Exception:
|
|
LOG.exception("Unable to create local protocol name map: %s",
|
|
sys.exc_info()[0])
|
|
finally:
|
|
libc.endprotoent()
|
|
return local_protocol_name_map
|
|
|
|
def _protocol_name_map(self):
|
|
if not self._iptables_protocol_name_map:
|
|
tmp_map = constants.IPTABLES_PROTOCOL_NAME_MAP.copy()
|
|
tmp_map.update(self._local_protocol_name_map())
|
|
self._iptables_protocol_name_map = tmp_map
|
|
return self._iptables_protocol_name_map
|
|
|
|
def _iptables_protocol_name(self, protocol):
|
|
# protocol zero is a special case and requires no '-p'
|
|
if protocol and protocol != '0':
|
|
return self._protocol_name_map().get(protocol, protocol)
|
|
|
|
def _protocol_arg(self, protocol, is_port):
|
|
iptables_rule = []
|
|
rule_protocol = self._iptables_protocol_name(protocol)
|
|
# protocol zero is a special case and requires no '-p'
|
|
if rule_protocol:
|
|
iptables_rule = ['-p', rule_protocol]
|
|
|
|
if (is_port and rule_protocol in constants.IPTABLES_PROTOCOL_MAP):
|
|
# iptables adds '-m protocol' when the port number is specified
|
|
iptables_rule += [
|
|
'-m', constants.IPTABLES_PROTOCOL_MAP[rule_protocol]
|
|
]
|
|
return iptables_rule
|
|
|
|
def _port_arg(self, direction, protocol, port_range_min, port_range_max):
|
|
args = []
|
|
if port_range_min is None:
|
|
return args
|
|
|
|
protocol = self._iptables_protocol_name(protocol)
|
|
if protocol in ['icmp', 'ipv6-icmp']:
|
|
protocol_type = 'icmpv6' if protocol == 'ipv6-icmp' else 'icmp'
|
|
# Note(xuhanp): port_range_min/port_range_max represent
|
|
# icmp type/code when protocol is icmp or icmpv6
|
|
args += ['--%s-type' % protocol_type, '%s' % port_range_min]
|
|
# icmp code can be 0 so we cannot use "if port_range_max" here
|
|
if port_range_max is not None:
|
|
args[-1] += '/%s' % port_range_max
|
|
elif protocol in const.SG_PORT_PROTO_NAMES:
|
|
# iptables protocols that support --dport, --sport and -m multiport
|
|
if port_range_min == port_range_max:
|
|
if protocol in const.IPTABLES_MULTIPORT_ONLY_PROTOCOLS:
|
|
# use -m multiport, but without a port range
|
|
args += ['-m', 'multiport', '--%ss' % direction,
|
|
'%s' % port_range_min]
|
|
else:
|
|
args += ['--%s' % direction, '%s' % port_range_min]
|
|
else:
|
|
args += ['-m', 'multiport', '--%ss' % direction,
|
|
'%s:%s' % (port_range_min, port_range_max)]
|
|
return args
|
|
|
|
def _ip_prefix_arg(self, direction, ip_prefix):
|
|
# NOTE (nati) : source_group_id is converted to list of source_
|
|
# ip_prefix in server side
|
|
if ip_prefix:
|
|
if '/' not in ip_prefix:
|
|
# we need to convert it into a prefix to match iptables
|
|
ip_prefix = c_utils.ip_to_cidr(ip_prefix)
|
|
elif ip_prefix.endswith('/0'):
|
|
# an allow for every address is not a constraint so
|
|
# iptables drops it
|
|
return []
|
|
return ['-%s' % direction, ip_prefix]
|
|
return []
|
|
|
|
def _port_chain_name(self, port, direction):
|
|
return iptables_manager.get_chain_name(
|
|
'%s%s' % (CHAIN_NAME_PREFIX[direction], port['device'][3:]))
|
|
|
|
def filter_defer_apply_on(self):
|
|
if not self._defer_apply:
|
|
self.iptables.defer_apply_on()
|
|
self._pre_defer_filtered_ports = dict(self.filtered_ports)
|
|
self._pre_defer_unfiltered_ports = dict(self.unfiltered_ports)
|
|
self.pre_sg_members = dict(self.sg_members)
|
|
self.pre_sg_rules = dict(self.sg_rules)
|
|
self._defer_apply = True
|
|
|
|
def _remove_unused_security_group_info(self):
|
|
"""Remove any unnecessary local security group info or unused ipsets.
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This function has to be called after applying the last iptables
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rules, so we're in a point where no iptable rule depends
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on an ipset we're going to delete.
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"""
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filtered_ports = self.filtered_ports.values()
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remote_sgs_to_remove = self._determine_remote_sgs_to_remove(
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filtered_ports)
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for ip_version, remote_sg_ids in remote_sgs_to_remove.items():
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if self.enable_ipset:
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self._remove_ipsets_for_remote_sgs(ip_version, remote_sg_ids)
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self._remove_sg_members(remote_sgs_to_remove)
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# Remove unused security group rules
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for remove_group_id in self._determine_sg_rules_to_remove(
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filtered_ports):
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self.sg_rules.pop(remove_group_id, None)
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def _determine_remote_sgs_to_remove(self, filtered_ports):
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"""Calculate which remote security groups we don't need anymore.
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We do the calculation for each ip_version.
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"""
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sgs_to_remove_per_ipversion = {constants.IPv4: set(),
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constants.IPv6: set()}
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remote_group_id_sets = self._get_remote_sg_ids_sets_by_ipversion(
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filtered_ports)
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for ip_version, remote_group_id_set in remote_group_id_sets.items():
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sgs_to_remove_per_ipversion[ip_version].update(
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set(self.pre_sg_members) - remote_group_id_set)
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return sgs_to_remove_per_ipversion
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def _get_remote_sg_ids_sets_by_ipversion(self, filtered_ports):
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"""Given a port, calculates the remote sg references by ip_version."""
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remote_group_id_sets = {constants.IPv4: set(),
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constants.IPv6: set()}
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for port in filtered_ports:
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remote_sg_ids = self._get_remote_sg_ids(port)
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for ip_version in (constants.IPv4, constants.IPv6):
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remote_group_id_sets[ip_version] |= remote_sg_ids[ip_version]
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return remote_group_id_sets
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def _determine_sg_rules_to_remove(self, filtered_ports):
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"""Calculate which security groups need to be removed.
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We find out by subtracting our previous sg group ids,
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with the security groups associated to a set of ports.
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"""
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port_group_ids = self._get_sg_ids_set_for_ports(filtered_ports)
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return set(self.pre_sg_rules) - port_group_ids
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def _get_sg_ids_set_for_ports(self, filtered_ports):
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"""Get the port security group ids as a set."""
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port_group_ids = set()
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for port in filtered_ports:
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port_group_ids.update(port.get('security_groups', []))
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return port_group_ids
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def _remove_ipsets_for_remote_sgs(self, ip_version, remote_sg_ids):
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"""Remove system ipsets matching the provided parameters."""
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for remote_sg_id in remote_sg_ids:
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self.ipset.destroy(remote_sg_id, ip_version)
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def _remove_sg_members(self, remote_sgs_to_remove):
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"""Remove sg_member entries."""
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ipv4_sec_group_set = remote_sgs_to_remove.get(constants.IPv4)
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ipv6_sec_group_set = remote_sgs_to_remove.get(constants.IPv6)
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for sg_id in (ipv4_sec_group_set & ipv6_sec_group_set):
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if sg_id in self.sg_members:
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del self.sg_members[sg_id]
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def _find_deleted_sg_rules(self, sg_id):
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del_rules = list()
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for pre_rule in self.pre_sg_rules.get(sg_id, []):
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if pre_rule not in self.sg_rules.get(sg_id, []):
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del_rules.append(pre_rule)
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return del_rules
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|
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def _find_devices_on_security_group(self, sg_id):
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|
device_list = list()
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for device in self.filtered_ports.values():
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if sg_id in device.get('security_groups', []):
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device_list.append(device)
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return device_list
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|
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def _clean_deleted_sg_rule_conntrack_entries(self):
|
|
deleted_sg_ids = set()
|
|
for sg_id in set(self.updated_rule_sg_ids):
|
|
del_rules = self._find_deleted_sg_rules(sg_id)
|
|
if not del_rules:
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|
continue
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|
device_list = self._find_devices_on_security_group(sg_id)
|
|
for rule in del_rules:
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|
self.ipconntrack.delete_conntrack_state_by_rule(
|
|
device_list, rule)
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deleted_sg_ids.add(sg_id)
|
|
for id in deleted_sg_ids:
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|
self.updated_rule_sg_ids.remove(id)
|
|
|
|
def _clean_updated_sg_member_conntrack_entries(self):
|
|
updated_device_ids = set()
|
|
for device in set(self.updated_sg_members):
|
|
sec_group_change = False
|
|
device_info = self.filtered_ports.get(device)
|
|
pre_device_info = self._pre_defer_filtered_ports.get(device)
|
|
if not device_info or not pre_device_info:
|
|
continue
|
|
for sg_id in pre_device_info.get('security_groups', []):
|
|
if sg_id not in device_info.get('security_groups', []):
|
|
sec_group_change = True
|
|
break
|
|
if not sec_group_change:
|
|
continue
|
|
for ethertype in [constants.IPv4, constants.IPv6]:
|
|
self.ipconntrack.delete_conntrack_state_by_remote_ips(
|
|
[device_info], ethertype, set())
|
|
updated_device_ids.add(device)
|
|
for id in updated_device_ids:
|
|
self.updated_sg_members.remove(id)
|
|
|
|
def _clean_deleted_remote_sg_members_conntrack_entries(self):
|
|
deleted_sg_ids = set()
|
|
for sg_id, devices in self.devices_with_updated_sg_members.items():
|
|
for ethertype in [constants.IPv4, constants.IPv6]:
|
|
pre_ips = self._get_sg_members(
|
|
self.pre_sg_members, sg_id, ethertype)
|
|
cur_ips = self._get_sg_members(
|
|
self.sg_members, sg_id, ethertype)
|
|
ips = (pre_ips - cur_ips)
|
|
if devices and ips:
|
|
self.ipconntrack.delete_conntrack_state_by_remote_ips(
|
|
devices, ethertype, ips)
|
|
deleted_sg_ids.add(sg_id)
|
|
for id in deleted_sg_ids:
|
|
self.devices_with_updated_sg_members.pop(id, None)
|
|
|
|
def _remove_conntrack_entries_from_sg_updates(self):
|
|
self._clean_deleted_sg_rule_conntrack_entries()
|
|
self._clean_updated_sg_member_conntrack_entries()
|
|
if not self.enable_ipset:
|
|
self._clean_deleted_remote_sg_members_conntrack_entries()
|
|
|
|
def _get_sg_members(self, sg_info, sg_id, ethertype):
|
|
ip_mac_addresses = sg_info.get(sg_id, {}).get(ethertype, [])
|
|
return set([ip_mac[0] for ip_mac in ip_mac_addresses])
|
|
|
|
def filter_defer_apply_off(self):
|
|
if self._defer_apply:
|
|
self._defer_apply = False
|
|
self._remove_chains_apply(self._pre_defer_filtered_ports,
|
|
self._pre_defer_unfiltered_ports)
|
|
self._setup_chains_apply(self.filtered_ports,
|
|
self.unfiltered_ports)
|
|
self.iptables.defer_apply_off()
|
|
self._remove_conntrack_entries_from_sg_updates()
|
|
self._remove_unused_security_group_info()
|
|
self._pre_defer_filtered_ports = None
|
|
self._pre_defer_unfiltered_ports = None
|
|
|
|
|
|
class OVSHybridIptablesFirewallDriver(IptablesFirewallDriver):
|
|
OVS_HYBRID_PLUG_REQUIRED = True
|
|
CONNTRACK_ZONE_PER_PORT = True
|
|
|
|
def _port_chain_name(self, port, direction):
|
|
return iptables_manager.get_chain_name(
|
|
'%s%s' % (CHAIN_NAME_PREFIX[direction], port['device']))
|
|
|
|
def _get_br_device_name(self, port):
|
|
return ('qvb' + port['device'])[:constants.LINUX_DEV_LEN]
|
|
|
|
def _get_device_name(self, port):
|
|
device_name = super(
|
|
OVSHybridIptablesFirewallDriver, self)._get_device_name(port)
|
|
return get_hybrid_port_name(device_name)
|