Merge "Add ARP spoofing protection for LinuxBridge agent" into stable/kilo
This commit is contained in:
commit
64f765cd69
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@ -0,0 +1,11 @@
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# neutron-rootwrap command filters for nodes on which neutron is
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# expected to control network
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#
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# This file should be owned by (and only-writeable by) the root user
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# format seems to be
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# cmd-name: filter-name, raw-command, user, args
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[Filters]
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ebtables: CommandFilter, ebtables, root
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@ -0,0 +1,128 @@
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# Copyright (c) 2015 Mirantis, 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
|
||||
# not use this file except in compliance with the License. You may obtain
|
||||
# a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||
# License for the specific language governing permissions and limitations
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||||
# under the License.
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||||
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import netaddr
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from oslo_concurrency import lockutils
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from oslo_log import log as logging
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from neutron.agent.linux import ip_lib
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from neutron.i18n import _LI
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LOG = logging.getLogger(__name__)
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SPOOF_CHAIN_PREFIX = 'neutronARP-'
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def setup_arp_spoofing_protection(vif, port_details):
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current_rules = ebtables(['-L']).splitlines()
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if not port_details.get('port_security_enabled', True):
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# clear any previous entries related to this port
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delete_arp_spoofing_protection([vif], current_rules)
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LOG.info(_LI("Skipping ARP spoofing rules for port '%s' because "
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"it has port security disabled"), vif)
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return
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# collect all of the addresses and cidrs that belong to the port
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addresses = {f['ip_address'] for f in port_details['fixed_ips']}
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if port_details.get('allowed_address_pairs'):
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addresses |= {p['ip_address']
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for p in port_details['allowed_address_pairs']}
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addresses = {ip for ip in addresses
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if netaddr.IPNetwork(ip).version == 4}
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if any(netaddr.IPNetwork(ip).prefixlen == 0 for ip in addresses):
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# don't try to install protection because a /0 prefix allows any
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# address anyway and the ARP_SPA can only match on /1 or more.
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return
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install_arp_spoofing_protection(vif, addresses, current_rules)
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def chain_name(vif):
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# start each chain with a common identifer for cleanup to find
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return '%s%s' % (SPOOF_CHAIN_PREFIX, vif)
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@lockutils.synchronized('ebtables')
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def delete_arp_spoofing_protection(vifs, current_rules=None):
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if not current_rules:
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current_rules = ebtables(['-L']).splitlines()
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# delete the jump rule and then delete the whole chain
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jumps = [vif for vif in vifs if vif_jump_present(vif, current_rules)]
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for vif in jumps:
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ebtables(['-D', 'FORWARD', '-i', vif, '-j',
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chain_name(vif), '-p', 'ARP'])
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for vif in vifs:
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if chain_exists(chain_name(vif), current_rules):
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ebtables(['-X', chain_name(vif)])
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def delete_unreferenced_arp_protection(current_vifs):
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# deletes all jump rules and chains that aren't in current_vifs but match
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# the spoof prefix
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output = ebtables(['-L']).splitlines()
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to_delete = []
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for line in output:
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# we're looking to find and turn the following:
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# Bridge chain: SPOOF_CHAIN_PREFIXtap199, entries: 0, policy: DROP
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# into 'tap199'
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if line.startswith('Bridge chain: %s' % SPOOF_CHAIN_PREFIX):
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devname = line.split(SPOOF_CHAIN_PREFIX, 1)[1].split(',')[0]
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if devname not in current_vifs:
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to_delete.append(devname)
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LOG.info(_LI("Clearing orphaned ARP spoofing entries for devices %s"),
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to_delete)
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delete_arp_spoofing_protection(to_delete, output)
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@lockutils.synchronized('ebtables')
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def install_arp_spoofing_protection(vif, addresses, current_rules):
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# make a VIF-specific ARP chain so we don't conflict with other rules
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vif_chain = chain_name(vif)
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if not chain_exists(vif_chain, current_rules):
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ebtables(['-N', vif_chain, '-P', 'DROP'])
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# flush the chain to clear previous accepts. this will cause dropped ARP
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# packets until the allows are installed, but that's better than leaked
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# spoofed packets and ARP can handle losses.
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ebtables(['-F', vif_chain])
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for addr in addresses:
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ebtables(['-A', vif_chain, '-p', 'ARP', '--arp-ip-src', addr,
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'-j', 'ACCEPT'])
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# check if jump rule already exists, if not, install it
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if not vif_jump_present(vif, current_rules):
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ebtables(['-A', 'FORWARD', '-i', vif, '-j',
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vif_chain, '-p', 'ARP'])
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def chain_exists(chain, current_rules):
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for rule in current_rules:
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if rule.startswith('Bridge chain: %s' % chain):
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return True
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return False
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def vif_jump_present(vif, current_rules):
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searches = (('-i %s' % vif), ('-j %s' % chain_name(vif)), ('-p ARP'))
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for line in current_rules:
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if all(s in line for s in searches):
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return True
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return False
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# Used to scope ebtables commands in testing
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NAMESPACE = None
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def ebtables(comm):
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execute = ip_lib.IPWrapper(NAMESPACE).netns.execute
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return execute(['ebtables'] + comm, run_as_root=True)
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@ -45,6 +45,7 @@ from neutron import context
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from neutron.i18n import _LE, _LI, _LW
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from neutron.openstack.common import loopingcall
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from neutron.plugins.common import constants as p_const
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from neutron.plugins.linuxbridge.agent import arp_protect
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from neutron.plugins.linuxbridge.common import config # noqa
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from neutron.plugins.linuxbridge.common import constants as lconst
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@ -753,6 +754,7 @@ class LinuxBridgeNeutronAgentRPC(object):
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def __init__(self, interface_mappings, polling_interval):
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self.polling_interval = polling_interval
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self.prevent_arp_spoofing = cfg.CONF.AGENT.prevent_arp_spoofing
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self.setup_linux_bridge(interface_mappings)
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configurations = {'interface_mappings': interface_mappings}
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if self.br_mgr.vxlan_mode != lconst.VXLAN_NONE:
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@ -870,6 +872,11 @@ class LinuxBridgeNeutronAgentRPC(object):
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if 'port_id' in device_details:
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LOG.info(_LI("Port %(device)s updated. Details: %(details)s"),
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{'device': device, 'details': device_details})
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if self.prevent_arp_spoofing:
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port = self.br_mgr.get_tap_device_name(
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device_details['port_id'])
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arp_protect.setup_arp_spoofing_protection(port,
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device_details)
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if device_details['admin_state_up']:
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# create the networking for the port
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network_type = device_details.get('network_type')
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@ -923,6 +930,8 @@ class LinuxBridgeNeutronAgentRPC(object):
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LOG.info(_LI("Port %s updated."), device)
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else:
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LOG.debug("Device %s not defined on plugin", device)
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if self.prevent_arp_spoofing:
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arp_protect.delete_arp_spoofing_protection(devices)
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return resync
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def scan_devices(self, previous, sync):
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@ -943,6 +952,10 @@ class LinuxBridgeNeutronAgentRPC(object):
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'current': set(),
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'updated': set(),
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'removed': set()}
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# clear any orphaned ARP spoofing rules (e.g. interface was
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# manually deleted)
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if self.prevent_arp_spoofing:
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arp_protect.delete_unreferenced_arp_protection(current_devices)
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if sync:
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# This is the first iteration, or the previous one had a problem.
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|
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@ -62,6 +62,22 @@ agent_opts = [
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"polling for local device changes.")),
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cfg.BoolOpt('rpc_support_old_agents', default=False,
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help=_("Enable server RPC compatibility with old agents")),
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# TODO(kevinbenton): The following opt is duplicated between the OVS agent
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# and the Linuxbridge agent to make it easy to back-port. These shared opts
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# should be moved into a common agent config options location as part of
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# the deduplication work.
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cfg.BoolOpt('prevent_arp_spoofing', default=False,
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help=_("Enable suppression of ARP responses that don't match "
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"an IP address that belongs to the port from which "
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"they originate. Note: This prevents the VMs attached "
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"to this agent from spoofing, it doesn't protect them "
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"from other devices which have the capability to spoof "
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"(e.g. bare metal or VMs attached to agents without "
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"this flag set to True). Spoofing rules will not be "
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"added to any ports that have port security disabled. "
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"For LinuxBridge, this requires ebtables. For OVS, it "
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"requires a version that supports matching ARP "
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"headers."))
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]
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|
|
|
@ -83,8 +83,9 @@ agent_opts = [
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"(e.g. bare metal or VMs attached to agents without "
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"this flag set to True). Spoofing rules will not be "
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"added to any ports that have port security disabled. "
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"This requires a version of OVS that supports matching "
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"ARP headers.")),
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"For LinuxBridge, this requires ebtables. For OVS, it "
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"requires a version that supports matching ARP "
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"headers.")),
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cfg.BoolOpt('dont_fragment', default=True,
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help=_("Set or un-set the don't fragment (DF) bit on "
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"outgoing IP packet carrying GRE/VXLAN tunnel.")),
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|
|
|
@ -0,0 +1,96 @@
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# Copyright (c) 2015 Thales Services SAS
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#
|
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
||||
# not use this file except in compliance with the License. You may obtain
|
||||
# a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||
# License for the specific language governing permissions and limitations
|
||||
# under the License.
|
||||
#
|
||||
|
||||
import fixtures
|
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from neutron.agent.linux import ip_lib
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from neutron.tests.common import net_helpers
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|
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class FakeMachine(fixtures.Fixture):
|
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"""Create a fake machine.
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:ivar bridge: bridge on which the fake machine is bound
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:ivar ip_cidr: fake machine ip_cidr
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:type ip_cidr: str
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:ivar ip: fake machine ip
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:type ip: str
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:ivar gateway_ip: fake machine gateway ip
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:type gateway_ip: str
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:ivar namespace: namespace emulating the machine
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:type namespace: str
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:ivar port: port binding the namespace to the bridge
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:type port: IPDevice
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"""
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def __init__(self, bridge, ip_cidr, gateway_ip=None):
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super(FakeMachine, self).__init__()
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self.bridge = bridge
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self.ip_cidr = ip_cidr
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self.ip = self.ip_cidr.partition('/')[0]
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self.gateway_ip = gateway_ip
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def setUp(self):
|
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super(FakeMachine, self).setUp()
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ns_fixture = self.useFixture(
|
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net_helpers.NamespaceFixture())
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self.namespace = ns_fixture.name
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self.port = self.useFixture(
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net_helpers.PortFixture.get(self.bridge, self.namespace)).port
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self.port.addr.add(self.ip_cidr)
|
||||
|
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if self.gateway_ip:
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net_helpers.set_namespace_gateway(self.port, self.gateway_ip)
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||||
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||||
def execute(self, *args, **kwargs):
|
||||
ns_ip_wrapper = ip_lib.IPWrapper(self.namespace)
|
||||
return ns_ip_wrapper.netns.execute(*args, **kwargs)
|
||||
|
||||
def assert_ping(self, dst_ip):
|
||||
net_helpers.assert_ping(self.namespace, dst_ip)
|
||||
|
||||
def assert_no_ping(self, dst_ip):
|
||||
net_helpers.assert_no_ping(self.namespace, dst_ip)
|
||||
|
||||
|
||||
class PeerMachines(fixtures.Fixture):
|
||||
"""Create 'amount' peered machines on an ip_cidr.
|
||||
|
||||
:ivar bridge: bridge on which peer machines are bound
|
||||
:ivar ip_cidr: ip_cidr on which peer machines have ips
|
||||
:type ip_cidr: str
|
||||
:ivar machines: fake machines
|
||||
:type machines: FakeMachine list
|
||||
"""
|
||||
|
||||
CIDR = '192.168.0.1/24'
|
||||
|
||||
def __init__(self, bridge, ip_cidr=None, gateway_ip=None, amount=2):
|
||||
super(PeerMachines, self).__init__()
|
||||
self.bridge = bridge
|
||||
self.ip_cidr = ip_cidr or self.CIDR
|
||||
self.gateway_ip = gateway_ip
|
||||
self.amount = amount
|
||||
|
||||
def setUp(self):
|
||||
super(PeerMachines, self).setUp()
|
||||
self.machines = []
|
||||
for index in range(self.amount):
|
||||
ip_cidr = net_helpers.increment_ip_cidr(self.ip_cidr, index)
|
||||
self.machines.append(
|
||||
self.useFixture(
|
||||
FakeMachine(self.bridge, ip_cidr, self.gateway_ip)))
|
|
@ -62,6 +62,31 @@ def set_namespace_gateway(port_dev, gateway_ip):
|
|||
port_dev.route.add_gateway(gateway_ip)
|
||||
|
||||
|
||||
def assert_arping(src_namespace, dst_ip, source=None, timeout=1, count=1):
|
||||
"""Send arp request using arping executable.
|
||||
|
||||
NOTE: ARP protocol is used in IPv4 only. IPv6 uses Neighbour Discovery
|
||||
Protocol instead.
|
||||
"""
|
||||
ns_ip_wrapper = ip_lib.IPWrapper(src_namespace)
|
||||
arping_cmd = ['arping', '-c', count, '-w', timeout]
|
||||
if source:
|
||||
arping_cmd.extend(['-s', source])
|
||||
arping_cmd.append(dst_ip)
|
||||
ns_ip_wrapper.netns.execute(arping_cmd)
|
||||
|
||||
|
||||
def assert_no_arping(src_namespace, dst_ip, source=None, timeout=1, count=1):
|
||||
try:
|
||||
assert_arping(src_namespace, dst_ip, source, timeout, count)
|
||||
except RuntimeError:
|
||||
pass
|
||||
else:
|
||||
tools.fail("destination ip %(destination)s is replying to arp from "
|
||||
"namespace %(ns)s, but it shouldn't" %
|
||||
{'ns': src_namespace, 'destination': dst_ip})
|
||||
|
||||
|
||||
class NamespaceFixture(fixtures.Fixture):
|
||||
"""Create a namespace.
|
||||
|
||||
|
@ -116,6 +141,15 @@ class VethFixture(fixtures.Fixture):
|
|||
# when a namespace owning a veth endpoint is deleted.
|
||||
pass
|
||||
|
||||
@staticmethod
|
||||
def get_peer_name(name):
|
||||
if name.startswith(VETH0_PREFIX):
|
||||
return name.replace(VETH0_PREFIX, VETH1_PREFIX)
|
||||
elif name.startswith(VETH1_PREFIX):
|
||||
return name.replace(VETH1_PREFIX, VETH0_PREFIX)
|
||||
else:
|
||||
tools.fail('%s is not a valid VethFixture veth endpoint' % name)
|
||||
|
||||
|
||||
@six.add_metaclass(abc.ABCMeta)
|
||||
class PortFixture(fixtures.Fixture):
|
||||
|
@ -140,6 +174,17 @@ class PortFixture(fixtures.Fixture):
|
|||
if not self.bridge:
|
||||
self.bridge = self.useFixture(self._create_bridge_fixture()).bridge
|
||||
|
||||
@classmethod
|
||||
def get(cls, bridge, namespace=None):
|
||||
"""Deduce PortFixture class from bridge type and instantiate it."""
|
||||
if isinstance(bridge, ovs_lib.OVSBridge):
|
||||
return OVSPortFixture(bridge, namespace)
|
||||
if isinstance(bridge, bridge_lib.BridgeDevice):
|
||||
return LinuxBridgePortFixture(bridge, namespace)
|
||||
if isinstance(bridge, VethBridge):
|
||||
return VethPortFixture(bridge, namespace)
|
||||
tools.fail('Unexpected bridge type: %s' % type(bridge))
|
||||
|
||||
|
||||
class OVSBridgeFixture(fixtures.Fixture):
|
||||
"""Create an OVS bridge.
|
||||
|
|
|
@ -0,0 +1,100 @@
|
|||
# Copyright (c) 2015 Mirantis, Inc.
|
||||
# All Rights Reserved.
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
||||
# not use this file except in compliance with the License. You may obtain
|
||||
# a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
||||
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
||||
# License for the specific language governing permissions and limitations
|
||||
# under the License.
|
||||
from oslo_config import cfg
|
||||
|
||||
from neutron.plugins.linuxbridge.agent import arp_protect
|
||||
from neutron.tests.common import machine_fixtures
|
||||
from neutron.tests.common import net_helpers
|
||||
from neutron.tests.functional import base as functional_base
|
||||
|
||||
no_arping = net_helpers.assert_no_arping
|
||||
arping = net_helpers.assert_arping
|
||||
|
||||
|
||||
class LinuxBridgeARPSpoofTestCase(functional_base.BaseSudoTestCase):
|
||||
|
||||
def setUp(self):
|
||||
super(LinuxBridgeARPSpoofTestCase, self).setUp()
|
||||
cfg.CONF.set_override('prevent_arp_spoofing', True, 'AGENT')
|
||||
lbfixture = self.useFixture(net_helpers.LinuxBridgeFixture())
|
||||
self.addCleanup(setattr, arp_protect, 'NAMESPACE', None)
|
||||
arp_protect.NAMESPACE = lbfixture.namespace
|
||||
bridge = lbfixture.bridge
|
||||
self.source, self.destination, self.observer = self.useFixture(
|
||||
machine_fixtures.PeerMachines(bridge, amount=3)).machines
|
||||
|
||||
def _add_arp_protection(self, machine, addresses, extra_port_dict=None):
|
||||
port_dict = {'fixed_ips': [{'ip_address': a} for a in addresses]}
|
||||
if extra_port_dict:
|
||||
port_dict.update(extra_port_dict)
|
||||
name = net_helpers.VethFixture.get_peer_name(machine.port.name)
|
||||
arp_protect.setup_arp_spoofing_protection(name, port_dict)
|
||||
self.addCleanup(arp_protect.delete_arp_spoofing_protection,
|
||||
[name])
|
||||
|
||||
def test_arp_no_protection(self):
|
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arping(self.source.namespace, self.destination.ip)
|
||||
arping(self.destination.namespace, self.source.ip)
|
||||
|
||||
def test_arp_correct_protection(self):
|
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self._add_arp_protection(self.source, [self.source.ip])
|
||||
self._add_arp_protection(self.destination, [self.destination.ip])
|
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arping(self.source.namespace, self.destination.ip)
|
||||
arping(self.destination.namespace, self.source.ip)
|
||||
|
||||
def test_arp_fails_incorrect_protection(self):
|
||||
self._add_arp_protection(self.source, ['1.1.1.1'])
|
||||
self._add_arp_protection(self.destination, ['2.2.2.2'])
|
||||
no_arping(self.source.namespace, self.destination.ip)
|
||||
no_arping(self.destination.namespace, self.source.ip)
|
||||
|
||||
def test_arp_protection_removal(self):
|
||||
self._add_arp_protection(self.source, ['1.1.1.1'])
|
||||
self._add_arp_protection(self.destination, ['2.2.2.2'])
|
||||
no_arping(self.observer.namespace, self.destination.ip)
|
||||
no_arping(self.observer.namespace, self.source.ip)
|
||||
name = net_helpers.VethFixture.get_peer_name(self.source.port.name)
|
||||
arp_protect.delete_arp_spoofing_protection([name])
|
||||
# spoofing should have been removed from source, but not dest
|
||||
arping(self.observer.namespace, self.source.ip)
|
||||
no_arping(self.observer.namespace, self.destination.ip)
|
||||
|
||||
def test_arp_protection_update(self):
|
||||
self._add_arp_protection(self.source, ['1.1.1.1'])
|
||||
self._add_arp_protection(self.destination, ['2.2.2.2'])
|
||||
no_arping(self.observer.namespace, self.destination.ip)
|
||||
no_arping(self.observer.namespace, self.source.ip)
|
||||
self._add_arp_protection(self.source, ['192.0.0.0/1'])
|
||||
# spoofing should have been updated on source, but not dest
|
||||
arping(self.observer.namespace, self.source.ip)
|
||||
no_arping(self.observer.namespace, self.destination.ip)
|
||||
|
||||
def test_arp_protection_port_security_disabled(self):
|
||||
self._add_arp_protection(self.source, ['1.1.1.1'])
|
||||
no_arping(self.observer.namespace, self.source.ip)
|
||||
self._add_arp_protection(self.source, ['1.1.1.1'],
|
||||
{'port_security_enabled': False})
|
||||
arping(self.observer.namespace, self.source.ip)
|
||||
|
||||
def test_arp_protection_dead_reference_removal(self):
|
||||
self._add_arp_protection(self.source, ['1.1.1.1'])
|
||||
self._add_arp_protection(self.destination, ['2.2.2.2'])
|
||||
no_arping(self.observer.namespace, self.destination.ip)
|
||||
no_arping(self.observer.namespace, self.source.ip)
|
||||
name = net_helpers.VethFixture.get_peer_name(self.source.port.name)
|
||||
# This should remove all arp protect rules that aren't source port
|
||||
arp_protect.delete_unreferenced_arp_protection([name])
|
||||
no_arping(self.observer.namespace, self.source.ip)
|
||||
arping(self.observer.namespace, self.destination.ip)
|
Loading…
Reference in New Issue