170
165
# End of Avahi example code
173
def _datetime_to_dbus(dt, variant_level=0):
174
"""Convert a UTC datetime.datetime() to a D-Bus type."""
175
return dbus.String(dt.isoformat(), variant_level=variant_level)
178
class Client(dbus.service.Object):
168
class Client(object):
179
169
"""A representation of a client host served by this server.
181
name: string; from the config file, used in log messages
171
name: string; from the config file, used in log messages
182
172
fingerprint: string (40 or 32 hexadecimal digits); used to
183
173
uniquely identify the client
184
secret: bytestring; sent verbatim (over TLS) to client
185
host: string; available for use by the checker command
186
created: datetime.datetime(); (UTC) object creation
187
last_enabled: datetime.datetime(); (UTC)
189
last_checked_ok: datetime.datetime(); (UTC) or None
190
timeout: datetime.timedelta(); How long from last_checked_ok
191
until this client is invalid
192
interval: datetime.timedelta(); How often to start a new checker
193
disable_hook: If set, called by disable() as disable_hook(self)
194
checker: subprocess.Popen(); a running checker process used
195
to see if the client lives.
196
'None' if no process is running.
174
secret: bytestring; sent verbatim (over TLS) to client
175
host: string; available for use by the checker command
176
created: datetime.datetime(); object creation, not client host
177
last_checked_ok: datetime.datetime() or None if not yet checked OK
178
timeout: datetime.timedelta(); How long from last_checked_ok
179
until this client is invalid
180
interval: datetime.timedelta(); How often to start a new checker
181
stop_hook: If set, called by stop() as stop_hook(self)
182
checker: subprocess.Popen(); a running checker process used
183
to see if the client lives.
184
'None' if no process is running.
197
185
checker_initiator_tag: a gobject event source tag, or None
198
disable_initiator_tag: - '' -
186
stop_initiator_tag: - '' -
199
187
checker_callback_tag: - '' -
200
188
checker_command: string; External command which is run to check if
201
189
client lives. %() expansions are done at
202
190
runtime with vars(self) as dict, so that for
203
191
instance %(name)s can be used in the command.
204
dbus_object_path: dbus.ObjectPath
205
192
Private attibutes:
206
193
_timeout: Real variable for 'timeout'
207
194
_interval: Real variable for 'interval'
233
216
+ (self.interval.microseconds
236
self.PropertyChanged(dbus.String(u"interval"),
237
(dbus.UInt64(self._interval_milliseconds,
239
interval = property(lambda self: self._interval, _set_interval)
218
interval = property(lambda self: self._interval,
240
220
del _set_interval
242
def __init__(self, name = None, disable_hook=None, config=None):
221
def __init__(self, name = None, stop_hook=None, config={}):
243
222
"""Note: the 'checker' key in 'config' sets the
244
223
'checker_command' attribute and *not* the 'checker'
246
self.dbus_object_path = (dbus.ObjectPath
248
+ name.replace(".", "_")))
249
dbus.service.Object.__init__(self, bus,
250
self.dbus_object_path)
254
226
logger.debug(u"Creating client %r", self.name)
255
227
# Uppercase and remove spaces from fingerprint for later
256
228
# comparison purposes with return value from the fingerprint()
258
self.fingerprint = (config["fingerprint"].upper()
230
self.fingerprint = config["fingerprint"].upper()\
260
232
logger.debug(u" Fingerprint: %s", self.fingerprint)
261
233
if "secret" in config:
262
234
self.secret = config["secret"].decode(u"base64")
263
235
elif "secfile" in config:
264
with closing(open(os.path.expanduser
266
(config["secfile"])))) as secfile:
267
self.secret = secfile.read()
236
sf = open(config["secfile"])
237
self.secret = sf.read()
269
240
raise TypeError(u"No secret or secfile for client %s"
271
242
self.host = config.get("host", "")
272
self.created = datetime.datetime.utcnow()
274
self.last_enabled = None
243
self.created = datetime.datetime.now()
275
244
self.last_checked_ok = None
276
245
self.timeout = string_to_delta(config["timeout"])
277
246
self.interval = string_to_delta(config["interval"])
278
self.disable_hook = disable_hook
247
self.stop_hook = stop_hook
279
248
self.checker = None
280
249
self.checker_initiator_tag = None
281
self.disable_initiator_tag = None
250
self.stop_initiator_tag = None
282
251
self.checker_callback_tag = None
283
self.checker_command = config["checker"]
252
self.check_command = config["checker"]
286
254
"""Start this client's checker and timeout hooks"""
287
self.last_enabled = datetime.datetime.utcnow()
288
255
# Schedule a new checker to be started an 'interval' from now,
289
256
# and every interval from then on.
290
self.checker_initiator_tag = (gobject.timeout_add
291
(self._interval_milliseconds,
257
self.checker_initiator_tag = gobject.timeout_add\
258
(self._interval_milliseconds,
293
260
# Also start a new checker *right now*.
294
261
self.start_checker()
295
# Schedule a disable() when 'timeout' has passed
296
self.disable_initiator_tag = (gobject.timeout_add
297
(self._timeout_milliseconds,
301
self.PropertyChanged(dbus.String(u"enabled"),
302
dbus.Boolean(True, variant_level=1))
303
self.PropertyChanged(dbus.String(u"last_enabled"),
304
(_datetime_to_dbus(self.last_enabled,
308
"""Disable this client."""
309
if not getattr(self, "enabled", False):
262
# Schedule a stop() when 'timeout' has passed
263
self.stop_initiator_tag = gobject.timeout_add\
264
(self._timeout_milliseconds,
268
The possibility that a client might be restarted is left open,
269
but not currently used."""
270
# If this client doesn't have a secret, it is already stopped.
271
if hasattr(self, "secret") and self.secret:
272
logger.info(u"Stopping client %s", self.name)
311
logger.info(u"Disabling client %s", self.name)
312
if getattr(self, "disable_initiator_tag", False):
313
gobject.source_remove(self.disable_initiator_tag)
314
self.disable_initiator_tag = None
276
if getattr(self, "stop_initiator_tag", False):
277
gobject.source_remove(self.stop_initiator_tag)
278
self.stop_initiator_tag = None
315
279
if getattr(self, "checker_initiator_tag", False):
316
280
gobject.source_remove(self.checker_initiator_tag)
317
281
self.checker_initiator_tag = None
318
282
self.stop_checker()
319
if self.disable_hook:
320
self.disable_hook(self)
323
self.PropertyChanged(dbus.String(u"enabled"),
324
dbus.Boolean(False, variant_level=1))
325
285
# Do not run this again if called by a gobject.timeout_add
328
287
def __del__(self):
329
self.disable_hook = None
332
def checker_callback(self, pid, condition, command):
288
self.stop_hook = None
290
def checker_callback(self, pid, condition):
333
291
"""The checker has completed, so take appropriate actions."""
292
now = datetime.datetime.now()
334
293
self.checker_callback_tag = None
335
294
self.checker = None
337
self.PropertyChanged(dbus.String(u"checker_running"),
338
dbus.Boolean(False, variant_level=1))
339
if (os.WIFEXITED(condition)
340
and (os.WEXITSTATUS(condition) == 0)):
295
if os.WIFEXITED(condition) \
296
and (os.WEXITSTATUS(condition) == 0):
341
297
logger.info(u"Checker for %(name)s succeeded",
344
self.CheckerCompleted(dbus.Boolean(True),
345
dbus.UInt16(condition),
346
dbus.String(command))
299
self.last_checked_ok = now
300
gobject.source_remove(self.stop_initiator_tag)
301
self.stop_initiator_tag = gobject.timeout_add\
302
(self._timeout_milliseconds,
348
304
elif not os.WIFEXITED(condition):
349
305
logger.warning(u"Checker for %(name)s crashed?",
352
self.CheckerCompleted(dbus.Boolean(False),
353
dbus.UInt16(condition),
354
dbus.String(command))
356
308
logger.info(u"Checker for %(name)s failed",
359
self.CheckerCompleted(dbus.Boolean(False),
360
dbus.UInt16(condition),
361
dbus.String(command))
363
def bump_timeout(self):
364
"""Bump up the timeout for this client.
365
This should only be called when the client has been seen,
368
self.last_checked_ok = datetime.datetime.utcnow()
369
gobject.source_remove(self.disable_initiator_tag)
370
self.disable_initiator_tag = (gobject.timeout_add
371
(self._timeout_milliseconds,
373
self.PropertyChanged(dbus.String(u"last_checked_ok"),
374
(_datetime_to_dbus(self.last_checked_ok,
377
310
def start_checker(self):
378
311
"""Start a new checker subprocess if one is not running.
379
312
If a checker already exists, leave it running and do
388
321
# is as it should be.
389
322
if self.checker is None:
391
# In case checker_command has exactly one % operator
392
command = self.checker_command % self.host
324
# In case check_command has exactly one % operator
325
command = self.check_command % self.host
393
326
except TypeError:
394
327
# Escape attributes for the shell
395
328
escaped_attrs = dict((key, re.escape(str(val)))
397
330
vars(self).iteritems())
399
command = self.checker_command % escaped_attrs
332
command = self.check_command % escaped_attrs
400
333
except TypeError, error:
401
334
logger.error(u'Could not format string "%s":'
402
u' %s', self.checker_command, error)
335
u' %s', self.check_command, error)
403
336
return True # Try again later
405
338
logger.info(u"Starting checker %r for %s",
406
339
command, self.name)
407
# We don't need to redirect stdout and stderr, since
408
# in normal mode, that is already done by daemon(),
409
# and in debug mode we don't want to. (Stdin is
410
# always replaced by /dev/null.)
411
340
self.checker = subprocess.Popen(command,
413
342
shell=True, cwd="/")
415
self.CheckerStarted(command)
416
self.PropertyChanged(dbus.String("checker_running"),
417
dbus.Boolean(True, variant_level=1))
418
self.checker_callback_tag = (gobject.child_watch_add
420
self.checker_callback,
422
except OSError, error:
343
self.checker_callback_tag = gobject.child_watch_add\
345
self.checker_callback)
346
except subprocess.OSError, error:
423
347
logger.error(u"Failed to start subprocess: %s",
425
349
# Re-run this periodically if run by gobject.timeout_add
428
351
def stop_checker(self):
429
352
"""Force the checker process, if any, to stop."""
430
353
if self.checker_callback_tag:
442
365
if error.errno != errno.ESRCH: # No such process
444
367
self.checker = None
445
self.PropertyChanged(dbus.String(u"checker_running"),
446
dbus.Boolean(False, variant_level=1))
448
368
def still_valid(self):
449
369
"""Has the timeout not yet passed for this client?"""
450
if not getattr(self, "enabled", False):
452
now = datetime.datetime.utcnow()
370
now = datetime.datetime.now()
453
371
if self.last_checked_ok is None:
454
372
return now < (self.created + self.timeout)
456
374
return now < (self.last_checked_ok + self.timeout)
458
## D-Bus methods & signals
459
_interface = u"org.mandos_system.Mandos.Client"
461
# BumpTimeout - method
462
BumpTimeout = dbus.service.method(_interface)(bump_timeout)
463
BumpTimeout.__name__ = "BumpTimeout"
465
# CheckerCompleted - signal
466
@dbus.service.signal(_interface, signature="bqs")
467
def CheckerCompleted(self, success, condition, command):
471
# CheckerStarted - signal
472
@dbus.service.signal(_interface, signature="s")
473
def CheckerStarted(self, command):
477
# GetAllProperties - method
478
@dbus.service.method(_interface, out_signature="a{sv}")
479
def GetAllProperties(self):
481
return dbus.Dictionary({
483
dbus.String(self.name, variant_level=1),
484
dbus.String("fingerprint"):
485
dbus.String(self.fingerprint, variant_level=1),
487
dbus.String(self.host, variant_level=1),
488
dbus.String("created"):
489
_datetime_to_dbus(self.created, variant_level=1),
490
dbus.String("last_enabled"):
491
(_datetime_to_dbus(self.last_enabled,
493
if self.last_enabled is not None
494
else dbus.Boolean(False, variant_level=1)),
495
dbus.String("enabled"):
496
dbus.Boolean(self.enabled, variant_level=1),
497
dbus.String("last_checked_ok"):
498
(_datetime_to_dbus(self.last_checked_ok,
500
if self.last_checked_ok is not None
501
else dbus.Boolean (False, variant_level=1)),
502
dbus.String("timeout"):
503
dbus.UInt64(self._timeout_milliseconds,
505
dbus.String("interval"):
506
dbus.UInt64(self._interval_milliseconds,
508
dbus.String("checker"):
509
dbus.String(self.checker_command,
511
dbus.String("checker_running"):
512
dbus.Boolean(self.checker is not None,
516
# IsStillValid - method
517
IsStillValid = (dbus.service.method(_interface, out_signature="b")
519
IsStillValid.__name__ = "IsStillValid"
521
# PropertyChanged - signal
522
@dbus.service.signal(_interface, signature="sv")
523
def PropertyChanged(self, property, value):
527
# SetChecker - method
528
@dbus.service.method(_interface, in_signature="s")
529
def SetChecker(self, checker):
530
"D-Bus setter method"
531
self.checker_command = checker
534
@dbus.service.method(_interface, in_signature="s")
535
def SetHost(self, host):
536
"D-Bus setter method"
539
# SetInterval - method
540
@dbus.service.method(_interface, in_signature="t")
541
def SetInterval(self, milliseconds):
542
self.interval = datetime.timdeelta(0, 0, 0, milliseconds)
545
@dbus.service.method(_interface, in_signature="ay",
547
def SetSecret(self, secret):
548
"D-Bus setter method"
549
self.secret = str(secret)
551
# SetTimeout - method
552
@dbus.service.method(_interface, in_signature="t")
553
def SetTimeout(self, milliseconds):
554
self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
557
Enable = dbus.service.method(_interface)(enable)
558
Enable.__name__ = "Enable"
560
# StartChecker - method
561
@dbus.service.method(_interface)
562
def StartChecker(self):
567
@dbus.service.method(_interface)
572
# StopChecker - method
573
StopChecker = dbus.service.method(_interface)(stop_checker)
574
StopChecker.__name__ = "StopChecker"
579
377
def peer_certificate(session):
580
378
"Return the peer's OpenPGP certificate as a bytestring"
581
379
# If not an OpenPGP certificate...
582
if (gnutls.library.functions
583
.gnutls_certificate_type_get(session._c_object)
584
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
380
if gnutls.library.functions.gnutls_certificate_type_get\
381
(session._c_object) \
382
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
585
383
# ...do the normal thing
586
384
return session.peer_certificate
587
385
list_size = ctypes.c_uint()
588
cert_list = (gnutls.library.functions
589
.gnutls_certificate_get_peers
590
(session._c_object, ctypes.byref(list_size)))
386
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
387
(session._c_object, ctypes.byref(list_size))
591
388
if list_size.value == 0:
593
390
cert = cert_list[0]
597
394
def fingerprint(openpgp):
598
395
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
599
396
# New GnuTLS "datum" with the OpenPGP public key
600
datum = (gnutls.library.types
601
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
604
ctypes.c_uint(len(openpgp))))
397
datum = gnutls.library.types.gnutls_datum_t\
398
(ctypes.cast(ctypes.c_char_p(openpgp),
399
ctypes.POINTER(ctypes.c_ubyte)),
400
ctypes.c_uint(len(openpgp)))
605
401
# New empty GnuTLS certificate
606
402
crt = gnutls.library.types.gnutls_openpgp_crt_t()
607
(gnutls.library.functions
608
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
403
gnutls.library.functions.gnutls_openpgp_crt_init\
609
405
# Import the OpenPGP public key into the certificate
610
(gnutls.library.functions
611
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
612
gnutls.library.constants
613
.GNUTLS_OPENPGP_FMT_RAW))
614
# Verify the self signature in the key
615
crtverify = ctypes.c_uint()
616
(gnutls.library.functions
617
.gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
618
if crtverify.value != 0:
619
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
620
raise gnutls.errors.CertificateSecurityError("Verify failed")
406
gnutls.library.functions.gnutls_openpgp_crt_import\
407
(crt, ctypes.byref(datum),
408
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
621
409
# New buffer for the fingerprint
622
buf = ctypes.create_string_buffer(20)
623
buf_len = ctypes.c_size_t()
410
buffer = ctypes.create_string_buffer(20)
411
buffer_length = ctypes.c_size_t()
624
412
# Get the fingerprint from the certificate into the buffer
625
(gnutls.library.functions
626
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
627
ctypes.byref(buf_len)))
413
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
414
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
628
415
# Deinit the certificate
629
416
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
630
417
# Convert the buffer to a Python bytestring
631
fpr = ctypes.string_at(buf, buf_len.value)
418
fpr = ctypes.string_at(buffer, buffer_length.value)
632
419
# Convert the bytestring to hexadecimal notation
633
420
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
637
class TCP_handler(SocketServer.BaseRequestHandler, object):
424
class tcp_handler(SocketServer.BaseRequestHandler, object):
638
425
"""A TCP request handler class.
639
426
Instantiated by IPv6_TCPServer for each request to handle it.
640
427
Note: This will run in its own forked process."""
642
429
def handle(self):
643
430
logger.info(u"TCP connection from: %s",
644
unicode(self.client_address))
645
session = (gnutls.connection
646
.ClientSession(self.request,
431
unicode(self.client_address))
432
session = gnutls.connection.ClientSession\
433
(self.request, gnutls.connection.X509Credentials())
650
435
line = self.request.makefile().readline()
651
436
logger.debug(u"Protocol version: %r", line)
786
563
datetime.timedelta(1)
787
564
>>> string_to_delta(u'1w')
788
565
datetime.timedelta(7)
789
>>> string_to_delta('5m 30s')
790
datetime.timedelta(0, 330)
792
timevalue = datetime.timedelta(0)
793
for s in interval.split():
795
suffix = unicode(s[-1])
798
delta = datetime.timedelta(value)
800
delta = datetime.timedelta(0, value)
802
delta = datetime.timedelta(0, 0, 0, 0, value)
804
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
806
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
809
except (ValueError, IndexError):
568
suffix=unicode(interval[-1])
569
value=int(interval[:-1])
571
delta = datetime.timedelta(value)
573
delta = datetime.timedelta(0, value)
575
delta = datetime.timedelta(0, 0, 0, 0, value)
577
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
579
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
582
except (ValueError, IndexError):
815
587
def server_state_changed(state):
816
588
"""Derived from the Avahi example code"""
817
589
if state == avahi.SERVER_COLLISION:
818
logger.error(u"Zeroconf server name collision")
590
logger.error(u"Server name collision")
820
592
elif state == avahi.SERVER_RUNNING:
955
733
# Parse config file with clients
956
734
client_defaults = { "timeout": "1h",
957
735
"interval": "5m",
958
"checker": "fping -q -- %(host)s",
736
"checker": "fping -q -- %%(host)s",
961
738
client_config = ConfigParser.SafeConfigParser(client_defaults)
962
739
client_config.read(os.path.join(server_settings["configdir"],
966
tcp_server = IPv6_TCPServer((server_settings["address"],
967
server_settings["port"]),
969
settings=server_settings,
971
pidfilename = "/var/run/mandos.pid"
973
pidfile = open(pidfilename, "w")
974
except IOError, error:
975
logger.error("Could not open file %r", pidfilename)
978
uid = pwd.getpwnam("_mandos").pw_uid
981
uid = pwd.getpwnam("mandos").pw_uid
984
uid = pwd.getpwnam("nobody").pw_uid
988
gid = pwd.getpwnam("_mandos").pw_gid
991
gid = pwd.getpwnam("mandos").pw_gid
994
gid = pwd.getpwnam("nogroup").pw_gid
1000
except OSError, error:
1001
if error[0] != errno.EPERM:
1005
743
service = AvahiService(name = server_settings["servicename"],
1006
servicetype = "_mandos._tcp", )
744
type = "_mandos._tcp", );
1007
745
if server_settings["interface"]:
1008
service.interface = (if_nametoindex
1009
(server_settings["interface"]))
746
service.interface = if_nametoindex(server_settings["interface"])
1011
748
global main_loop
1075
809
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1076
810
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1078
class MandosServer(dbus.service.Object):
1079
"""A D-Bus proxy object"""
1081
dbus.service.Object.__init__(self, bus,
1083
_interface = u"org.mandos_system.Mandos"
1085
@dbus.service.signal(_interface, signature="oa{sv}")
1086
def ClientAdded(self, objpath, properties):
1090
@dbus.service.signal(_interface, signature="o")
1091
def ClientRemoved(self, objpath):
1095
@dbus.service.method(_interface, out_signature="ao")
1096
def GetAllClients(self):
1097
return dbus.Array(c.dbus_object_path for c in clients)
1099
@dbus.service.method(_interface, out_signature="a{oa{sv}}")
1100
def GetAllClientsWithProperties(self):
1101
return dbus.Dictionary(
1102
((c.dbus_object_path, c.GetAllProperties())
1106
@dbus.service.method(_interface, in_signature="o")
1107
def RemoveClient(self, object_path):
1109
if c.dbus_object_path == object_path:
1117
mandos_server = MandosServer()
1119
812
for client in clients:
1121
mandos_server.ClientAdded(client.dbus_object_path,
1122
client.GetAllProperties())
1126
tcp_server.server_activate()
815
tcp_server = IPv6_TCPServer((server_settings["address"],
816
server_settings["port"]),
818
settings=server_settings,
1128
820
# Find out what port we got
1129
821
service.port = tcp_server.socket.getsockname()[1]
1130
822
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"