/
ovs_firewall_log.py
477 lines (411 loc) · 18.4 KB
/
ovs_firewall_log.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
# Copyright (c) 2017 Fujitsu Limited
# 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.
import collections
from neutron_lib import constants as lib_const
from neutron_lib.plugins.ml2 import ovs_constants as ovs_consts
from neutron_lib.services.logapi import constants as log_const
from os_ken.base import app_manager
from os_ken.lib.packet import packet
from oslo_config import cfg
from oslo_log import formatters
from oslo_log import handlers
from oslo_log import log as logging
from neutron.agent.linux.openvswitch_firewall import constants as ovsfw_consts
from neutron.agent.linux.openvswitch_firewall import firewall as ovsfw
from neutron.agent.linux.openvswitch_firewall import rules
from neutron.services.logapi.agent import log_extension as log_ext
from neutron.services.logapi.common import exceptions as log_exc
from neutron.services.logapi.drivers.openvswitch import log_oskenapp
LOG = logging.getLogger(__name__)
OVS_FW_TO_LOG_TABLES = {
ovs_consts.RULES_EGRESS_TABLE: ovs_consts.ACCEPTED_EGRESS_TRAFFIC_TABLE,
ovs_consts.RULES_INGRESS_TABLE: ovs_consts.ACCEPTED_INGRESS_TRAFFIC_TABLE,
}
FIELDS_TO_REMOVE = ['priority', 'actions', 'dl_type',
'reg_port', 'reg_remote_group']
REMOTE_RULE_PRIORITY = 70
def setup_logging():
log_file = cfg.CONF.network_log.local_output_log_base
if log_file:
# pylint: disable=import-outside-toplevel
from logging import handlers as watch_handler
log_file_handler = watch_handler.WatchedFileHandler(log_file)
log_file_handler.setLevel(
logging.DEBUG if cfg.CONF.debug else logging.INFO)
LOG.logger.addHandler(log_file_handler)
log_file_handler.setFormatter(
formatters.ContextFormatter(
fmt=cfg.CONF.logging_default_format_string,
datefmt=cfg.CONF.log_date_format))
elif cfg.CONF.use_journal:
journal_handler = handlers.OSJournalHandler()
LOG.logger.addHandler(journal_handler)
else:
syslog_handler = handlers.OSSysLogHandler()
LOG.logger.addHandler(syslog_handler)
def find_deleted_sg_rules(old_port, new_ports):
del_rules = []
for port in new_ports:
if old_port.id == port.id:
for rule in old_port.secgroup_rules:
if rule not in port.secgroup_rules:
del_rules.append(rule)
return del_rules
return del_rules
class Cookie(object):
def __init__(self, cookie_id, port, action, project):
self.id = cookie_id
self.port = port
self.action = action
self.project = project
self.log_object_refs = set()
def __eq__(self, other):
return (self.id == other.id and
self.action == other.action and
self.port == other.port)
def __hash__(self):
return hash(self.id)
def add_log_obj_ref(self, log_id):
self.log_object_refs.add(log_id)
def remove_log_obj_ref(self, log_id):
self.log_object_refs.discard(log_id)
@property
def is_empty(self):
return not self.log_object_refs
class OFPortLog(object):
def __init__(self, port, ovs_port, log_event):
self.id = port['port_id']
self.ofport = ovs_port.ofport
self.secgroup_rules = [self._update_rule(rule) for rule in
port['security_group_rules']]
# event can be ALL, DROP and ACCEPT
self.event = log_event
def _update_rule(self, rule):
protocol = rule.get('protocol')
if protocol is not None:
if not isinstance(protocol, int) and protocol.isdigit():
rule['protocol'] = int(protocol)
elif (rule.get('ethertype') == lib_const.IPv6 and
protocol == lib_const.PROTO_NAME_ICMP):
rule['protocol'] = lib_const.PROTO_NUM_IPV6_ICMP
else:
rule['protocol'] = lib_const.IP_PROTOCOL_MAP.get(
protocol, protocol)
return rule
class OVSFirewallLoggingDriver(log_ext.LoggingDriver):
SUPPORTED_LOGGING_TYPES = ['security_group']
REQUIRED_PROTOCOLS = [
ovs_consts.OPENFLOW13,
ovs_consts.OPENFLOW14,
]
def __init__(self, agent_api):
integration_bridge = agent_api.request_int_br()
self.int_br = self.initialize_bridge(integration_bridge)
self._deferred = False
self.log_ports = collections.defaultdict(dict)
self.cookies_table = set()
self.cookie_ids_to_delete = set()
self.conj_id_map = ovsfw.ConjIdMap(self.int_br.br)
def initialize(self, resource_rpc, **kwargs):
self.resource_rpc = resource_rpc
setup_logging()
self.start_logapp()
@staticmethod
def initialize_bridge(bridge):
bridge.add_protocols(*OVSFirewallLoggingDriver.REQUIRED_PROTOCOLS)
# set rate limit and burst limit for controller
bridge.set_controller_rate_limit(cfg.CONF.network_log.rate_limit)
bridge.set_controller_burst_limit(cfg.CONF.network_log.burst_limit)
return bridge.deferred(full_ordered=True)
def start_logapp(self):
app_mgr = app_manager.AppManager.get_instance()
self.log_app = app_mgr.instantiate(log_oskenapp.OVSLogOSKenApp)
self.log_app.start()
self.log_app.register_packet_in_handler(self.packet_in_handler)
def packet_in_handler(self, ev):
msg = ev.msg
cookie_id = msg.cookie
pkt = packet.Packet(msg.data)
try:
cookie_entry = self._get_cookie_by_id(cookie_id)
LOG.info("action=%s project_id=%s log_resource_ids=%s vm_port=%s "
"pkt=%s", cookie_entry.action, cookie_entry.project,
list(cookie_entry.log_object_refs),
cookie_entry.port, pkt)
except log_exc.CookieNotFound:
LOG.warning("Unknown cookie=%s packet_in pkt=%s", cookie_id, pkt)
def defer_apply_on(self):
self._deferred = True
def defer_apply_off(self):
if self._deferred:
self.int_br.apply_flows()
self._cleanup_cookies()
self._deferred = False
def _get_cookie(self, port_id, action):
for cookie in self.cookies_table:
if cookie.port == port_id and cookie.action == action:
return cookie
def _get_cookies_by_port(self, port_id):
cookies_list = []
for cookie in self.cookies_table:
if cookie.port == port_id:
cookies_list.append(cookie)
return cookies_list
def _get_cookie_by_id(self, cookie_id):
for cookie in self.cookies_table:
if str(cookie.id) == str(cookie_id):
return cookie
raise log_exc.CookieNotFound(cookie_id=cookie_id)
def _cleanup_cookies(self):
cookie_ids = self.cookie_ids_to_delete
self.cookie_ids_to_delete = set()
for cookie_id in cookie_ids:
self.int_br.br.unset_cookie(cookie_id)
def generate_cookie(self, port_id, action, log_id, project_id):
cookie = self._get_cookie(port_id, action)
if not cookie:
cookie_id = self.int_br.br.request_cookie()
cookie = Cookie(cookie_id=cookie_id, port=port_id,
action=action, project=project_id)
self.cookies_table.add(cookie)
cookie.add_log_obj_ref(log_id)
return cookie.id
def _schedule_cookie_deletion(self, cookie):
# discard a cookie object
self.cookies_table.remove(cookie)
# schedule to cleanup cookie_ids later
self.cookie_ids_to_delete.add(cookie.id)
def start_logging(self, context, **kwargs):
LOG.debug("start logging: %s", str(kwargs))
for resource_type in self.SUPPORTED_LOGGING_TYPES:
# handle port updated, agent restarted
if 'port_id' in kwargs:
self._handle_logging('_create', context,
resource_type, **kwargs)
else:
self._handle_log_resources_by_type(
'_create', context, resource_type, **kwargs)
def stop_logging(self, context, **kwargs):
LOG.debug("stop logging: %s", str(kwargs))
for resource_type in self.SUPPORTED_LOGGING_TYPES:
# handle port deleted
if 'port_id' in kwargs:
self._handle_logging('_delete', context,
resource_type, **kwargs)
else:
self._handle_log_resources_by_type(
'_delete', context, resource_type, **kwargs)
def _handle_log_resources_by_type(
self, action, context, resource_type, **kwargs):
log_resources = []
for log_obj in kwargs.get('log_resources', []):
if log_obj['resource_type'] == resource_type:
log_resources.append(log_obj)
if log_resources:
self._handle_logging(
action, context, resource_type, log_resources=log_resources)
def _handle_logging(self, action, context, resource_type, **kwargs):
handler_name = "%s_%s_log" % (action, resource_type)
handler = getattr(self, handler_name)
handler(context, **kwargs)
def create_ofport_log(self, port, log_id, log_event):
port_id = port['port_id']
ovs_port = self.int_br.br.get_vif_port_by_id(port_id)
if ovs_port:
of_port_log = OFPortLog(port, ovs_port, log_event)
self.log_ports[log_id].add(of_port_log)
def _create_security_group_log(self, context, **kwargs):
port_id = kwargs.get('port_id')
log_resources = kwargs.get('log_resources')
logs_info = []
if port_id:
# try to clean port flows log for port updated/create event
self._cleanup_port_flows_log(port_id)
logs_info = self.resource_rpc.get_sg_log_info_for_port(
context,
resource_type=log_const.SECURITY_GROUP,
port_id=port_id)
elif log_resources:
logs_info = self.resource_rpc.get_sg_log_info_for_log_resources(
context,
resource_type=log_const.SECURITY_GROUP,
log_resources=log_resources)
for log_info in logs_info:
log_id = log_info['id']
old_ofport_logs = self.log_ports.get(log_id, [])
ports = log_info.get('ports_log')
self.log_ports[log_id] = set()
for port in ports:
self.create_ofport_log(port, log_id, log_info.get('event'))
# try to clean flows log if sg_rules are deleted
for port in old_ofport_logs:
del_rules = find_deleted_sg_rules(
port, self.log_ports[log_id])
if del_rules:
self._delete_sg_rules_flow_log(port, del_rules)
for port_log in self.log_ports[log_id]:
self.add_flows_from_rules(port_log, log_info)
def _cleanup_port_flows_log(self, port_id):
cookies_list = self._get_cookies_by_port(port_id)
for cookie in cookies_list:
if cookie.action == log_const.ACCEPT_EVENT:
self._delete_flows(
table=ovs_consts.ACCEPTED_INGRESS_TRAFFIC_TABLE,
cookie=cookie.id)
self._delete_flows(
table=ovs_consts.ACCEPTED_EGRESS_TRAFFIC_TABLE,
cookie=cookie.id)
if cookie.action == log_const.DROP_EVENT:
self._delete_flows(
table=ovs_consts.DROPPED_TRAFFIC_TABLE,
cookie=cookie.id)
self._schedule_cookie_deletion(cookie)
def _delete_security_group_log(self, context, **kwargs):
# port deleted event
port_id = kwargs.get('port_id')
if port_id:
self._cleanup_port_flows_log(port_id)
# log resources deleted events
for log_resource in kwargs.get('log_resources', []):
log_id = log_resource.get('id')
of_port_logs = self.log_ports.get(log_id, [])
for of_port_log in of_port_logs:
self.delete_port_flows_log(of_port_log, log_id)
def _log_accept_flow(self, **flow):
# log first accepted packet
flow['table'] = OVS_FW_TO_LOG_TABLES[flow['table']]
flow['actions'] = 'controller'
# forward egress accepted packet and log
if flow['table'] == ovs_consts.ACCEPTED_EGRESS_TRAFFIC_TABLE:
flow['actions'] = 'resubmit(,%d),controller' % (
ovs_consts.ACCEPTED_EGRESS_TRAFFIC_NORMAL_TABLE)
self._add_flow(**flow)
def _add_flow(self, **kwargs):
dl_type = kwargs.get('dl_type')
ovsfw.create_reg_numbers(kwargs)
if isinstance(dl_type, int):
kwargs['dl_type'] = "0x{:04x}".format(dl_type)
LOG.debug("Add flow firewall log %s", str(kwargs))
if self._deferred:
self.int_br.add_flow(**kwargs)
else:
self.int_br.br.add_flow(**kwargs)
def _delete_flows(self, **kwargs):
ovsfw.create_reg_numbers(kwargs)
if self._deferred:
self.int_br.delete_flows(**kwargs)
else:
self.int_br.br.delete_flows(**kwargs)
def _log_drop_packet(self, port, log_id, project_id):
cookie = self.generate_cookie(port.id, log_const.DROP_EVENT,
log_id, project_id)
self._add_flow(
cookie=cookie,
table=ovs_consts.DROPPED_TRAFFIC_TABLE,
priority=53,
reg_port=port.ofport,
actions='controller'
)
def create_rules_generator_for_port(self, port):
yield from port.secgroup_rules
def _create_conj_flows_log(self, remote_rule, port):
ethertype = remote_rule['ethertype']
direction = remote_rule['direction']
remote_sg_id = remote_rule.get('remote_group_id')
remote_ag_id = remote_rule.get('remote_address_group_id')
secgroup_id = remote_rule['security_group_id']
# we only want to log first accept packet, that means a packet with
# ct_state=+new-est, reg_remote_group=conj_id + 1 will be logged
flow_template = {
'priority': REMOTE_RULE_PRIORITY,
'dl_type': ovsfw_consts.ethertype_to_dl_type_map[ethertype],
'reg_port': port.ofport,
'reg_remote_group': self.conj_id_map.get_conj_id(
secgroup_id, remote_sg_id or remote_ag_id,
direction, ethertype) + 1,
}
if direction == lib_const.INGRESS_DIRECTION:
flow_template['table'] = ovs_consts.RULES_INGRESS_TABLE
elif direction == lib_const.EGRESS_DIRECTION:
flow_template['table'] = ovs_consts.RULES_EGRESS_TABLE
return [flow_template]
def _log_accept_packet(self, port, log_id, project_id):
cookie = self.generate_cookie(port.id, log_const.ACCEPT_EVENT,
log_id, project_id)
for rule in self.create_rules_generator_for_port(port):
if 'remote_group_id' in rule or 'remote_address_group_id' in rule:
flows = self._create_conj_flows_log(rule, port)
else:
flows = rules.create_flows_from_rule_and_port(rule, port)
for flow in flows:
flow['cookie'] = cookie
self._log_accept_flow(**flow)
def add_flows_from_rules(self, port, log_info):
# log event can be ACCEPT or DROP or ALL(both ACCEPT and DROP)
event = log_info['event']
project_id = log_info['project_id']
log_id = log_info['id']
if event == log_const.ACCEPT_EVENT:
self._log_accept_packet(port, log_id, project_id)
elif event == log_const.DROP_EVENT:
self._log_drop_packet(port, log_id, project_id)
else:
self._log_drop_packet(port, log_id, project_id)
self._log_accept_packet(port, log_id, project_id)
def _delete_accept_flows_log(self, port, log_id):
cookie = self._get_cookie(port.id, log_const.ACCEPT_EVENT)
if cookie:
cookie.remove_log_obj_ref(log_id)
if cookie.is_empty:
self._delete_flows(
table=ovs_consts.ACCEPTED_INGRESS_TRAFFIC_TABLE,
cookie=cookie.id)
self._delete_flows(
table=ovs_consts.ACCEPTED_EGRESS_TRAFFIC_TABLE,
cookie=cookie.id)
self._schedule_cookie_deletion(cookie)
def _delete_drop_flows_log(self, port, log_id):
cookie = self._get_cookie(port.id, log_const.DROP_EVENT)
if cookie:
cookie.remove_log_obj_ref(log_id)
if cookie.is_empty:
self._delete_flows(table=ovs_consts.DROPPED_TRAFFIC_TABLE,
cookie=cookie.id)
self._schedule_cookie_deletion(cookie)
def delete_port_flows_log(self, port, log_id):
"""Delete all flows log for given port and log_id"""
event = port.event
if event == log_const.ACCEPT_EVENT:
self._delete_accept_flows_log(port, log_id)
elif event == log_const.DROP_EVENT:
self._delete_drop_flows_log(port, log_id)
else:
self._delete_accept_flows_log(port, log_id)
self._delete_drop_flows_log(port, log_id)
def _delete_sg_rules_flow_log(self, port, del_rules):
cookie = self._get_cookie(port.id, log_const.ACCEPT_EVENT)
if not cookie:
return
for rule in del_rules:
if 'remote_group_id' in rule or 'remote_address_group_id' in rule:
flows = self._create_conj_flows_log(rule, port)
else:
flows = rules.create_flows_from_rule_and_port(rule, port)
for flow in flows:
for kw in FIELDS_TO_REMOVE:
flow.pop(kw, None)
flow['table'] = OVS_FW_TO_LOG_TABLES[flow['table']]
flow['cookie'] = cookie.id
self._delete_flows(**flow)