257 lines
9.8 KiB
Python
257 lines
9.8 KiB
Python
# Copyright 2015 OpenStack Foundation
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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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"""
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NSX-V3 Plugin security integration module
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"""
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from neutron.db import securitygroups_db
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from vmware_nsx.db import nsx_models
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from vmware_nsx.nsxlib.v3 import dfw_api as firewall
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NSGROUP_CONTAINER = 'NSGroup Container'
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DEFAULT_SECTION = 'OS default section for security-groups'
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def _get_l4_protocol_name(protocol_number):
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if protocol_number is None:
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return
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protocol_number = securitygroups_db.IP_PROTOCOL_MAP.get(protocol_number,
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protocol_number)
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protocol_number = int(protocol_number)
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if protocol_number == 6:
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return firewall.TCP
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elif protocol_number == 17:
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return firewall.UDP
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elif protocol_number == 1:
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return firewall.ICMPV4
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else:
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return protocol_number
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def _get_direction(sg_rule):
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return firewall.IN if sg_rule['direction'] == 'ingress' else firewall.OUT
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def _decide_service(sg_rule):
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l4_protocol = _get_l4_protocol_name(sg_rule['protocol'])
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direction = _get_direction(sg_rule)
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if l4_protocol in [firewall.TCP, firewall.UDP]:
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# If port_range_min is not specified then we assume all ports are
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# matched, relying on neutron to perform validation.
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source_ports = []
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if sg_rule['port_range_min'] is None:
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destination_ports = []
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elif sg_rule['port_range_min'] != sg_rule['port_range_max']:
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# NSX API requires a non-empty range (e.g - '22-23')
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destination_ports = ['%(port_range_min)s-%(port_range_max)s'
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% sg_rule]
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else:
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destination_ports = ['%(port_range_min)s' % sg_rule]
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if direction == firewall.OUT:
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source_ports, destination_ports = destination_ports, []
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return firewall.get_nsservice(firewall.L4_PORT_SET_NSSERVICE,
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l4_protocol=l4_protocol,
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source_ports=source_ports,
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destination_ports=destination_ports)
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elif l4_protocol == firewall.ICMPV4:
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return firewall.get_nsservice(firewall.ICMP_TYPE_NSSERVICE,
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protocol=l4_protocol,
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icmp_type=sg_rule['port_range_min'],
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icmp_code=sg_rule['port_range_max'])
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elif l4_protocol is not None:
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return firewall.get_nsservice(firewall.IP_PROTOCOL_NSSERVICE,
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protocol_number=l4_protocol)
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def _get_fw_rule_from_sg_rule(sg_rule, nsgroup_id, rmt_nsgroup_id):
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# IPV4 or IPV6
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ip_protocol = sg_rule['ethertype'].upper()
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direction = _get_direction(sg_rule)
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source = None
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local_group = firewall.get_nsgroup_reference(nsgroup_id)
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if sg_rule['remote_ip_prefix'] is not None:
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source = firewall.get_ip_cidr_reference(sg_rule['remote_ip_prefix'],
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ip_protocol)
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destination = local_group
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else:
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if rmt_nsgroup_id:
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source = firewall.get_nsgroup_reference(rmt_nsgroup_id)
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destination = local_group
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if direction == firewall.OUT:
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source, destination = destination, source
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service = _decide_service(sg_rule)
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name = sg_rule['id']
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return firewall.get_firewall_rule_dict(name, source,
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destination, direction,
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ip_protocol, service,
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firewall.ALLOW)
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def create_firewall_rules(context, section_id, nsgroup_id,
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security_group_rules):
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# 1. translate rules
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# 2. insert in section
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# 3. save mappings
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firewall_rules = []
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for sg_rule in security_group_rules:
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remote_nsgroup_id = _get_remote_nsg_mapping(
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context, sg_rule, nsgroup_id)
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fw_rule = _get_fw_rule_from_sg_rule(
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sg_rule, nsgroup_id, remote_nsgroup_id)
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firewall_rules.append(fw_rule)
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return firewall.add_rules_in_section(firewall_rules, section_id)
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def get_nsgroup_name(security_group):
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# NOTE(roeyc): We add the security-group id to the NSGroup name,
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# for usability purposes.
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return '%(name)s - %(id)s' % security_group
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def save_sg_rule_mappings(session, firewall_rules):
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# REVISIT(roeyc): This method should take care db access only.
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rules = [(rule['display_name'], rule['id']) for rule in firewall_rules]
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with session.begin(subtransactions=True):
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for neutron_id, nsx_id in rules:
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mapping = nsx_models.NeutronNsxRuleMapping(
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neutron_id=neutron_id, nsx_id=nsx_id)
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session.add(mapping)
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return mapping
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def save_sg_mappings(session, sg_id, nsgroup_id, section_id):
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with session.begin(subtransactions=True):
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session.add(
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nsx_models.NeutronNsxFirewallSectionMapping(neutron_id=sg_id,
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nsx_id=section_id))
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session.add(
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nsx_models.NeutronNsxSecurityGroupMapping(neutron_id=sg_id,
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nsx_id=nsgroup_id))
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def get_sg_rule_mapping(session, rule_id):
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rule_mapping = session.query(nsx_models.NeutronNsxRuleMapping).filter_by(
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neutron_id=rule_id).one()
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return rule_mapping.nsx_id
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def get_sg_mappings(session, sg_id):
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nsgroup_mapping = session.query(nsx_models.NeutronNsxSecurityGroupMapping
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).filter_by(neutron_id=sg_id).one()
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section_mapping = session.query(nsx_models.NeutronNsxFirewallSectionMapping
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).filter_by(neutron_id=sg_id).one()
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return nsgroup_mapping.nsx_id, section_mapping.nsx_id
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def _get_remote_nsg_mapping(context, sg_rule, nsgroup_id):
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remote_nsgroup_id = None
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remote_group_id = sg_rule.get('remote_group_id')
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# skip unnecessary db access when possible
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if remote_group_id == sg_rule['security_group_id']:
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remote_nsgroup_id = nsgroup_id
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elif remote_group_id:
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remote_nsgroup_id, _ = get_sg_mappings(context.session,
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remote_group_id)
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return remote_nsgroup_id
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def update_lport_with_security_groups(context, lport_id, original, updated):
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added = set(updated) - set(original)
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removed = set(original) - set(updated)
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for sg_id in added:
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nsgroup_id, _ = get_sg_mappings(context.session, sg_id)
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firewall.add_nsgroup_member(
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nsgroup_id, firewall.LOGICAL_PORT, lport_id)
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for sg_id in removed:
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nsgroup_id, _ = get_sg_mappings(context.session, sg_id)
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firewall.remove_nsgroup_member(
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nsgroup_id, lport_id)
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def init_nsgroup_container_and_default_section_rules():
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# REVISIT(roeyc): Should handle Neutron active-active
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# deployment scenario.
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nsgroup_description = ('This NSGroup is necessary for OpenStack '
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'integration, do not delete.')
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section_description = ("This section is handled by OpenStack to contain "
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"default rules on security-groups.")
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nsgroup_id = _init_nsgroup_container(NSGROUP_CONTAINER,
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nsgroup_description)
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section_id = _init_default_section(
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DEFAULT_SECTION, section_description, nsgroup_id)
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return nsgroup_id, section_id
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def _init_nsgroup_container(name, description):
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nsgroups = firewall.list_nsgroups()
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for nsg in nsgroups:
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if nsg['display_name'] == name:
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# NSGroup container exists.
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break
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else:
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# Need to create the nsgroup container and the OS default
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# security-groups section.
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nsg = firewall.create_nsgroup(name, description, [])
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return nsg['id']
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def _init_default_section(name, description, nsgroup_id):
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fw_sections = firewall.list_sections()
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for section in fw_sections:
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if section.get('display_name') == name:
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break
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else:
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section = firewall.create_empty_section(
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name, description, [nsgroup_id], [])
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block_rule = firewall.get_firewall_rule_dict(
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'Block All', action=firewall.DROP)
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# TODO(roeyc): Add additional rules to allow IPV6 NDP.
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dhcp_client = firewall.get_nsservice(firewall.L4_PORT_SET_NSSERVICE,
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l4_protocol=firewall.UDP,
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source_ports=[67],
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destination_ports=[68])
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dhcp_client_rule_in = firewall.get_firewall_rule_dict(
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'DHCP Reply', direction=firewall.IN, service=dhcp_client)
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dhcp_server = (
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firewall.get_nsservice(firewall.L4_PORT_SET_NSSERVICE,
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l4_protocol=firewall.UDP,
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source_ports=[68],
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destination_ports=[67]))
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dhcp_client_rule_out = firewall.get_firewall_rule_dict(
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'DHCP Request', direction=firewall.OUT, service=dhcp_server)
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firewall.add_rules_in_section([dhcp_client_rule_out,
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dhcp_client_rule_in,
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block_rule],
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section['id'])
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return section['id']
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