116
98
class AvahiService(object):
117
"""An Avahi (Zeroconf) service.
120
100
interface: integer; avahi.IF_UNSPEC or an interface index.
121
101
Used to optionally bind to the specified interface.
122
name: string; Example: u'Mandos'
123
type: string; Example: u'_mandos._tcp'.
124
See <http://www.dns-sd.org/ServiceTypes.html>
125
port: integer; what port to announce
126
TXT: list of strings; TXT record for the service
127
domain: string; Domain to publish on, default to .local if empty.
128
host: string; Host to publish records for, default is localhost
129
max_renames: integer; maximum number of renames
130
rename_count: integer; counter so we only rename after collisions
131
a sensible number of times
132
group: D-Bus Entry Group
134
bus: dbus.SystemBus()
102
name = string; Example: "Mandos"
103
type = string; Example: "_mandos._tcp".
104
See <http://www.dns-sd.org/ServiceTypes.html>
105
port = integer; what port to announce
106
TXT = list of strings; TXT record for the service
107
domain = string; Domain to publish on, default to .local if empty.
108
host = string; Host to publish records for, default to localhost
110
max_renames = integer; maximum number of renames
111
rename_count = integer; counter so we only rename after collisions
112
a sensible number of times
136
114
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
137
servicetype = None, port = None, TXT = None,
138
domain = u"", host = u"", max_renames = 32768,
139
protocol = avahi.PROTO_UNSPEC, bus = None):
115
type = None, port = None, TXT = None, domain = "",
116
host = "", max_renames = 12):
117
"""An Avahi (Zeroconf) service. """
140
118
self.interface = interface
142
self.type = servicetype
144
self.TXT = TXT if TXT is not None else []
145
126
self.domain = domain
147
128
self.rename_count = 0
148
self.max_renames = max_renames
149
self.protocol = protocol
150
self.group = None # our entry group
153
129
def rename(self):
154
130
"""Derived from the Avahi example code"""
155
131
if self.rename_count >= self.max_renames:
156
logger.critical(u"No suitable Zeroconf service name found"
157
u" after %i retries, exiting.",
159
raise AvahiServiceError(u"Too many renames")
160
self.name = unicode(self.server.GetAlternativeServiceName(self.name))
161
logger.info(u"Changing Zeroconf service name to %r ...",
163
syslogger.setFormatter(logging.Formatter
164
(u'Mandos (%s) [%%(process)d]:'
165
u' %%(levelname)s: %%(message)s'
132
logger.critical(u"No suitable service name found after %i"
133
u" retries, exiting.", rename_count)
134
raise AvahiServiceError("Too many renames")
135
name = server.GetAlternativeServiceName(name)
136
logger.notice(u"Changing name to %r ...", name)
170
except dbus.exceptions.DBusException, error:
171
logger.critical(u"DBusException: %s", error)
174
139
self.rename_count += 1
175
140
def remove(self):
176
141
"""Derived from the Avahi example code"""
177
if self.group is not None:
142
if group is not None:
180
145
"""Derived from the Avahi example code"""
181
if self.group is None:
182
self.group = dbus.Interface(
183
self.bus.get_object(avahi.DBUS_NAME,
184
self.server.EntryGroupNew()),
185
avahi.DBUS_INTERFACE_ENTRY_GROUP)
186
self.group.connect_to_signal('StateChanged',
188
.entry_group_state_changed)
189
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
190
self.name, self.type)
191
self.group.AddService(
194
dbus.UInt32(0), # flags
195
self.name, self.type,
196
self.domain, self.host,
197
dbus.UInt16(self.port),
198
avahi.string_array_to_txt_array(self.TXT))
200
def entry_group_state_changed(self, state, error):
201
"""Derived from the Avahi example code"""
202
logger.debug(u"Avahi entry group state change: %i", state)
204
if state == avahi.ENTRY_GROUP_ESTABLISHED:
205
logger.debug(u"Zeroconf service established.")
206
elif state == avahi.ENTRY_GROUP_COLLISION:
207
logger.warning(u"Zeroconf service name collision.")
209
elif state == avahi.ENTRY_GROUP_FAILURE:
210
logger.critical(u"Avahi: Error in group state changed %s",
212
raise AvahiGroupError(u"State changed: %s"
215
"""Derived from the Avahi example code"""
216
if self.group is not None:
219
def server_state_changed(self, state):
220
"""Derived from the Avahi example code"""
221
logger.debug(u"Avahi server state change: %i", state)
222
if state == avahi.SERVER_COLLISION:
223
logger.error(u"Zeroconf server name collision")
225
elif state == avahi.SERVER_RUNNING:
228
"""Derived from the Avahi example code"""
229
if self.server is None:
230
self.server = dbus.Interface(
231
self.bus.get_object(avahi.DBUS_NAME,
232
avahi.DBUS_PATH_SERVER),
233
avahi.DBUS_INTERFACE_SERVER)
234
self.server.connect_to_signal(u"StateChanged",
235
self.server_state_changed)
236
self.server_state_changed(self.server.GetState())
148
group = dbus.Interface\
149
(bus.get_object(avahi.DBUS_NAME,
150
server.EntryGroupNew()),
151
avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
group.connect_to_signal('StateChanged',
153
entry_group_state_changed)
154
logger.debug(u"Adding service '%s' of type '%s' ...",
155
service.name, service.type)
157
self.interface, # interface
158
avahi.PROTO_INET6, # protocol
159
dbus.UInt32(0), # flags
160
self.name, self.type,
161
self.domain, self.host,
162
dbus.UInt16(self.port),
163
avahi.string_array_to_txt_array(self.TXT))
166
# From the Avahi example code:
167
group = None # our entry group
168
# End of Avahi example code
239
171
class Client(object):
240
172
"""A representation of a client host served by this server.
243
name: string; from the config file, used in log messages and
174
name: string; from the config file, used in log messages
245
175
fingerprint: string (40 or 32 hexadecimal digits); used to
246
176
uniquely identify the client
247
secret: bytestring; sent verbatim (over TLS) to client
248
host: string; available for use by the checker command
249
created: datetime.datetime(); (UTC) object creation
250
last_enabled: datetime.datetime(); (UTC)
252
last_checked_ok: datetime.datetime(); (UTC) or None
253
timeout: datetime.timedelta(); How long from last_checked_ok
254
until this client is disabled
255
interval: datetime.timedelta(); How often to start a new checker
256
disable_hook: If set, called by disable() as disable_hook(self)
257
checker: subprocess.Popen(); a running checker process used
258
to see if the client lives.
259
'None' if no process is running.
177
secret: bytestring; sent verbatim (over TLS) to client
178
fqdn: string (FQDN); available for use by the checker command
179
created: datetime.datetime(); object creation, not client host
180
last_checked_ok: datetime.datetime() or None if not yet checked OK
181
timeout: datetime.timedelta(); How long from last_checked_ok
182
until this client is invalid
183
interval: datetime.timedelta(); How often to start a new checker
184
stop_hook: If set, called by stop() as stop_hook(self)
185
checker: subprocess.Popen(); a running checker process used
186
to see if the client lives.
187
'None' if no process is running.
260
188
checker_initiator_tag: a gobject event source tag, or None
261
disable_initiator_tag: - '' -
189
stop_initiator_tag: - '' -
262
190
checker_callback_tag: - '' -
263
191
checker_command: string; External command which is run to check if
264
192
client lives. %() expansions are done at
265
193
runtime with vars(self) as dict, so that for
266
194
instance %(name)s can be used in the command.
267
current_checker_command: string; current running checker_command
268
approval_delay: datetime.timedelta(); Time to wait for approval
269
_approved: bool(); 'None' if not yet approved/disapproved
270
approval_duration: datetime.timedelta(); Duration of one approval
196
_timeout: Real variable for 'timeout'
197
_interval: Real variable for 'interval'
198
_timeout_milliseconds: Used when calling gobject.timeout_add()
199
_interval_milliseconds: - '' -
274
def _timedelta_to_milliseconds(td):
275
"Convert a datetime.timedelta() to milliseconds"
276
return ((td.days * 24 * 60 * 60 * 1000)
277
+ (td.seconds * 1000)
278
+ (td.microseconds // 1000))
280
def timeout_milliseconds(self):
281
"Return the 'timeout' attribute in milliseconds"
282
return self._timedelta_to_milliseconds(self.timeout)
284
def interval_milliseconds(self):
285
"Return the 'interval' attribute in milliseconds"
286
return self._timedelta_to_milliseconds(self.interval)
288
def approval_delay_milliseconds(self):
289
return self._timedelta_to_milliseconds(self.approval_delay)
291
def __init__(self, name = None, disable_hook=None, config=None):
292
"""Note: the 'checker' key in 'config' sets the
293
'checker_command' attribute and *not* the 'checker'
201
def _set_timeout(self, timeout):
202
"Setter function for 'timeout' attribute"
203
self._timeout = timeout
204
self._timeout_milliseconds = ((self.timeout.days
205
* 24 * 60 * 60 * 1000)
206
+ (self.timeout.seconds * 1000)
207
+ (self.timeout.microseconds
209
timeout = property(lambda self: self._timeout,
212
def _set_interval(self, interval):
213
"Setter function for 'interval' attribute"
214
self._interval = interval
215
self._interval_milliseconds = ((self.interval.days
216
* 24 * 60 * 60 * 1000)
217
+ (self.interval.seconds
219
+ (self.interval.microseconds
221
interval = property(lambda self: self._interval,
224
def __init__(self, name=None, stop_hook=None, fingerprint=None,
225
secret=None, secfile=None, fqdn=None, timeout=None,
226
interval=-1, checker=None):
227
"""Note: the 'checker' argument sets the 'checker_command'
228
attribute and not the 'checker' attribute.."""
298
230
logger.debug(u"Creating client %r", self.name)
299
# Uppercase and remove spaces from fingerprint for later
300
# comparison purposes with return value from the fingerprint()
302
self.fingerprint = (config[u"fingerprint"].upper()
231
# Uppercase and remove spaces from fingerprint
232
# for later comparison purposes with return value of
233
# the fingerprint() function
234
self.fingerprint = fingerprint.upper().replace(u" ", u"")
304
235
logger.debug(u" Fingerprint: %s", self.fingerprint)
305
if u"secret" in config:
306
self.secret = config[u"secret"].decode(u"base64")
307
elif u"secfile" in config:
308
with open(os.path.expanduser(os.path.expandvars
309
(config[u"secfile"])),
311
self.secret = secfile.read()
237
self.secret = secret.decode(u"base64")
240
self.secret = sf.read()
313
243
raise TypeError(u"No secret or secfile for client %s"
315
self.host = config.get(u"host", u"")
316
self.created = datetime.datetime.utcnow()
318
self.last_enabled = None
246
self.created = datetime.datetime.now()
319
247
self.last_checked_ok = None
320
self.timeout = string_to_delta(config[u"timeout"])
321
self.interval = string_to_delta(config[u"interval"])
322
self.disable_hook = disable_hook
248
self.timeout = string_to_delta(timeout)
249
self.interval = string_to_delta(interval)
250
self.stop_hook = stop_hook
323
251
self.checker = None
324
252
self.checker_initiator_tag = None
325
self.disable_initiator_tag = None
253
self.stop_initiator_tag = None
326
254
self.checker_callback_tag = None
327
self.checker_command = config[u"checker"]
328
self.current_checker_command = None
329
self.last_connect = None
330
self._approved = None
331
self.approved_by_default = config.get(u"approved_by_default",
333
self.approvals_pending = 0
334
self.approval_delay = string_to_delta(
335
config[u"approval_delay"])
336
self.approval_duration = string_to_delta(
337
config[u"approval_duration"])
338
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
340
def send_changedstate(self):
341
self.changedstate.acquire()
342
self.changedstate.notify_all()
343
self.changedstate.release()
255
self.check_command = checker
346
257
"""Start this client's checker and timeout hooks"""
347
if getattr(self, u"enabled", False):
350
self.send_changedstate()
351
self.last_enabled = datetime.datetime.utcnow()
352
258
# Schedule a new checker to be started an 'interval' from now,
353
259
# and every interval from then on.
354
self.checker_initiator_tag = (gobject.timeout_add
355
(self.interval_milliseconds(),
357
# Schedule a disable() when 'timeout' has passed
358
self.disable_initiator_tag = (gobject.timeout_add
359
(self.timeout_milliseconds(),
260
self.checker_initiator_tag = gobject.timeout_add\
261
(self._interval_milliseconds,
362
263
# Also start a new checker *right now*.
363
264
self.start_checker()
365
def disable(self, quiet=True):
366
"""Disable this client."""
367
if not getattr(self, "enabled", False):
265
# Schedule a stop() when 'timeout' has passed
266
self.stop_initiator_tag = gobject.timeout_add\
267
(self._timeout_milliseconds,
271
The possibility that a client might be restarted is left open,
272
but not currently used."""
273
# If this client doesn't have a secret, it is already stopped.
275
logger.debug(u"Stopping client %s", self.name)
370
self.send_changedstate()
372
logger.info(u"Disabling client %s", self.name)
373
if getattr(self, u"disable_initiator_tag", False):
374
gobject.source_remove(self.disable_initiator_tag)
375
self.disable_initiator_tag = None
376
if getattr(self, u"checker_initiator_tag", False):
279
if getattr(self, "stop_initiator_tag", False):
280
gobject.source_remove(self.stop_initiator_tag)
281
self.stop_initiator_tag = None
282
if getattr(self, "checker_initiator_tag", False):
377
283
gobject.source_remove(self.checker_initiator_tag)
378
284
self.checker_initiator_tag = None
379
285
self.stop_checker()
380
if self.disable_hook:
381
self.disable_hook(self)
383
288
# Do not run this again if called by a gobject.timeout_add
386
290
def __del__(self):
387
self.disable_hook = None
390
def checker_callback(self, pid, condition, command):
291
self.stop_hook = None
293
def checker_callback(self, pid, condition):
391
294
"""The checker has completed, so take appropriate actions."""
295
now = datetime.datetime.now()
392
296
self.checker_callback_tag = None
393
297
self.checker = None
394
if os.WIFEXITED(condition):
395
exitstatus = os.WEXITSTATUS(condition)
397
logger.info(u"Checker for %(name)s succeeded",
401
logger.info(u"Checker for %(name)s failed",
298
if os.WIFEXITED(condition) \
299
and (os.WEXITSTATUS(condition) == 0):
300
logger.debug(u"Checker for %(name)s succeeded",
302
self.last_checked_ok = now
303
gobject.source_remove(self.stop_initiator_tag)
304
self.stop_initiator_tag = gobject.timeout_add\
305
(self._timeout_milliseconds,
307
elif not os.WIFEXITED(condition):
404
308
logger.warning(u"Checker for %(name)s crashed?",
407
def checked_ok(self):
408
"""Bump up the timeout for this client.
410
This should only be called when the client has been seen,
413
self.last_checked_ok = datetime.datetime.utcnow()
414
gobject.source_remove(self.disable_initiator_tag)
415
self.disable_initiator_tag = (gobject.timeout_add
416
(self.timeout_milliseconds(),
311
logger.debug(u"Checker for %(name)s failed",
419
313
def start_checker(self):
420
314
"""Start a new checker subprocess if one is not running.
422
315
If a checker already exists, leave it running and do
424
317
# The reason for not killing a running checker is that if we
427
320
# client would inevitably timeout, since no checker would get
428
321
# a chance to run to completion. If we instead leave running
429
322
# checkers alone, the checker would have to take more time
430
# than 'timeout' for the client to be disabled, which is as it
433
# If a checker exists, make sure it is not a zombie
435
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
436
except (AttributeError, OSError), error:
437
if (isinstance(error, OSError)
438
and error.errno != errno.ECHILD):
442
logger.warning(u"Checker was a zombie")
443
gobject.source_remove(self.checker_callback_tag)
444
self.checker_callback(pid, status,
445
self.current_checker_command)
446
# Start a new checker if needed
323
# than 'timeout' for the client to be declared invalid, which
324
# is as it should be.
447
325
if self.checker is None:
449
# In case checker_command has exactly one % operator
450
command = self.checker_command % self.host
327
# In case check_command has exactly one % operator
328
command = self.check_command % self.fqdn
451
329
except TypeError:
452
330
# Escape attributes for the shell
453
escaped_attrs = dict((key,
454
re.escape(unicode(str(val),
331
escaped_attrs = dict((key, re.escape(str(val)))
458
333
vars(self).iteritems())
460
command = self.checker_command % escaped_attrs
335
command = self.check_command % escaped_attrs
461
336
except TypeError, error:
462
337
logger.error(u'Could not format string "%s":'
463
u' %s', self.checker_command, error)
338
u' %s', self.check_command, error)
464
339
return True # Try again later
465
self.current_checker_command = command
467
logger.info(u"Starting checker %r for %s",
469
# We don't need to redirect stdout and stderr, since
470
# in normal mode, that is already done by daemon(),
471
# and in debug mode we don't want to. (Stdin is
472
# always replaced by /dev/null.)
341
logger.debug(u"Starting checker %r for %s",
473
343
self.checker = subprocess.Popen(command,
475
shell=True, cwd=u"/")
476
self.checker_callback_tag = (gobject.child_watch_add
478
self.checker_callback,
480
# The checker may have completed before the gobject
481
# watch was added. Check for this.
482
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
484
gobject.source_remove(self.checker_callback_tag)
485
self.checker_callback(pid, status, command)
486
except OSError, error:
346
self.checker_callback_tag = gobject.child_watch_add\
348
self.checker_callback)
349
except subprocess.OSError, error:
487
350
logger.error(u"Failed to start subprocess: %s",
489
352
# Re-run this periodically if run by gobject.timeout_add
492
354
def stop_checker(self):
493
355
"""Force the checker process, if any, to stop."""
494
356
if self.checker_callback_tag:
495
357
gobject.source_remove(self.checker_callback_tag)
496
358
self.checker_callback_tag = None
497
if getattr(self, u"checker", None) is None:
359
if getattr(self, "checker", None) is None:
499
logger.debug(u"Stopping checker for %(name)s", vars(self))
361
logger.debug("Stopping checker for %(name)s", vars(self))
501
363
os.kill(self.checker.pid, signal.SIGTERM)
503
365
#if self.checker.poll() is None:
504
366
# os.kill(self.checker.pid, signal.SIGKILL)
505
367
except OSError, error:
506
368
if error.errno != errno.ESRCH: # No such process
508
370
self.checker = None
510
def dbus_service_property(dbus_interface, signature=u"v",
511
access=u"readwrite", byte_arrays=False):
512
"""Decorators for marking methods of a DBusObjectWithProperties to
513
become properties on the D-Bus.
515
The decorated method will be called with no arguments by "Get"
516
and with one argument by "Set".
518
The parameters, where they are supported, are the same as
519
dbus.service.method, except there is only "signature", since the
520
type from Get() and the type sent to Set() is the same.
522
# Encoding deeply encoded byte arrays is not supported yet by the
523
# "Set" method, so we fail early here:
524
if byte_arrays and signature != u"ay":
525
raise ValueError(u"Byte arrays not supported for non-'ay'"
526
u" signature %r" % signature)
528
func._dbus_is_property = True
529
func._dbus_interface = dbus_interface
530
func._dbus_signature = signature
531
func._dbus_access = access
532
func._dbus_name = func.__name__
533
if func._dbus_name.endswith(u"_dbus_property"):
534
func._dbus_name = func._dbus_name[:-14]
535
func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
540
class DBusPropertyException(dbus.exceptions.DBusException):
541
"""A base class for D-Bus property-related exceptions
543
def __unicode__(self):
544
return unicode(str(self))
547
class DBusPropertyAccessException(DBusPropertyException):
548
"""A property's access permissions disallows an operation.
553
class DBusPropertyNotFound(DBusPropertyException):
554
"""An attempt was made to access a non-existing property.
559
class DBusObjectWithProperties(dbus.service.Object):
560
"""A D-Bus object with properties.
562
Classes inheriting from this can use the dbus_service_property
563
decorator to expose methods as D-Bus properties. It exposes the
564
standard Get(), Set(), and GetAll() methods on the D-Bus.
568
def _is_dbus_property(obj):
569
return getattr(obj, u"_dbus_is_property", False)
571
def _get_all_dbus_properties(self):
572
"""Returns a generator of (name, attribute) pairs
574
return ((prop._dbus_name, prop)
576
inspect.getmembers(self, self._is_dbus_property))
578
def _get_dbus_property(self, interface_name, property_name):
579
"""Returns a bound method if one exists which is a D-Bus
580
property with the specified name and interface.
582
for name in (property_name,
583
property_name + u"_dbus_property"):
584
prop = getattr(self, name, None)
586
or not self._is_dbus_property(prop)
587
or prop._dbus_name != property_name
588
or (interface_name and prop._dbus_interface
589
and interface_name != prop._dbus_interface)):
593
raise DBusPropertyNotFound(self.dbus_object_path + u":"
594
+ interface_name + u"."
597
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
599
def Get(self, interface_name, property_name):
600
"""Standard D-Bus property Get() method, see D-Bus standard.
602
prop = self._get_dbus_property(interface_name, property_name)
603
if prop._dbus_access == u"write":
604
raise DBusPropertyAccessException(property_name)
606
if not hasattr(value, u"variant_level"):
608
return type(value)(value, variant_level=value.variant_level+1)
610
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
611
def Set(self, interface_name, property_name, value):
612
"""Standard D-Bus property Set() method, see D-Bus standard.
614
prop = self._get_dbus_property(interface_name, property_name)
615
if prop._dbus_access == u"read":
616
raise DBusPropertyAccessException(property_name)
617
if prop._dbus_get_args_options[u"byte_arrays"]:
618
# The byte_arrays option is not supported yet on
619
# signatures other than "ay".
620
if prop._dbus_signature != u"ay":
622
value = dbus.ByteArray(''.join(unichr(byte)
626
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
627
out_signature=u"a{sv}")
628
def GetAll(self, interface_name):
629
"""Standard D-Bus property GetAll() method, see D-Bus
632
Note: Will not include properties with access="write".
635
for name, prop in self._get_all_dbus_properties():
637
and interface_name != prop._dbus_interface):
638
# Interface non-empty but did not match
640
# Ignore write-only properties
641
if prop._dbus_access == u"write":
644
if not hasattr(value, u"variant_level"):
647
all[name] = type(value)(value, variant_level=
648
value.variant_level+1)
649
return dbus.Dictionary(all, signature=u"sv")
651
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
653
path_keyword='object_path',
654
connection_keyword='connection')
655
def Introspect(self, object_path, connection):
656
"""Standard D-Bus method, overloaded to insert property tags.
658
xmlstring = dbus.service.Object.Introspect(self, object_path,
661
document = xml.dom.minidom.parseString(xmlstring)
662
def make_tag(document, name, prop):
663
e = document.createElement(u"property")
664
e.setAttribute(u"name", name)
665
e.setAttribute(u"type", prop._dbus_signature)
666
e.setAttribute(u"access", prop._dbus_access)
668
for if_tag in document.getElementsByTagName(u"interface"):
669
for tag in (make_tag(document, name, prop)
671
in self._get_all_dbus_properties()
672
if prop._dbus_interface
673
== if_tag.getAttribute(u"name")):
674
if_tag.appendChild(tag)
675
# Add the names to the return values for the
676
# "org.freedesktop.DBus.Properties" methods
677
if (if_tag.getAttribute(u"name")
678
== u"org.freedesktop.DBus.Properties"):
679
for cn in if_tag.getElementsByTagName(u"method"):
680
if cn.getAttribute(u"name") == u"Get":
681
for arg in cn.getElementsByTagName(u"arg"):
682
if (arg.getAttribute(u"direction")
684
arg.setAttribute(u"name", u"value")
685
elif cn.getAttribute(u"name") == u"GetAll":
686
for arg in cn.getElementsByTagName(u"arg"):
687
if (arg.getAttribute(u"direction")
689
arg.setAttribute(u"name", u"props")
690
xmlstring = document.toxml(u"utf-8")
692
except (AttributeError, xml.dom.DOMException,
693
xml.parsers.expat.ExpatError), error:
694
logger.error(u"Failed to override Introspection method",
699
class ClientDBus(Client, DBusObjectWithProperties):
700
"""A Client class using D-Bus
703
dbus_object_path: dbus.ObjectPath
704
bus: dbus.SystemBus()
706
# dbus.service.Object doesn't use super(), so we can't either.
708
def __init__(self, bus = None, *args, **kwargs):
709
self._approvals_pending = 0
711
Client.__init__(self, *args, **kwargs)
712
# Only now, when this client is initialized, can it show up on
714
self.dbus_object_path = (dbus.ObjectPath
716
+ self.name.replace(u".", u"_")))
717
DBusObjectWithProperties.__init__(self, self.bus,
718
self.dbus_object_path)
720
def _get_approvals_pending(self):
721
return self._approvals_pending
722
def _set_approvals_pending(self, value):
723
old_value = self._approvals_pending
724
self._approvals_pending = value
726
if (hasattr(self, "dbus_object_path")
727
and bval is not bool(old_value)):
728
dbus_bool = dbus.Boolean(bval, variant_level=1)
729
self.PropertyChanged(dbus.String(u"ApprovalPending"),
732
approvals_pending = property(_get_approvals_pending,
733
_set_approvals_pending)
734
del _get_approvals_pending, _set_approvals_pending
737
def _datetime_to_dbus(dt, variant_level=0):
738
"""Convert a UTC datetime.datetime() to a D-Bus type."""
739
return dbus.String(dt.isoformat(),
740
variant_level=variant_level)
743
oldstate = getattr(self, u"enabled", False)
744
r = Client.enable(self)
745
if oldstate != self.enabled:
747
self.PropertyChanged(dbus.String(u"Enabled"),
748
dbus.Boolean(True, variant_level=1))
749
self.PropertyChanged(
750
dbus.String(u"LastEnabled"),
751
self._datetime_to_dbus(self.last_enabled,
755
def disable(self, quiet = False):
756
oldstate = getattr(self, u"enabled", False)
757
r = Client.disable(self, quiet=quiet)
758
if not quiet and oldstate != self.enabled:
760
self.PropertyChanged(dbus.String(u"Enabled"),
761
dbus.Boolean(False, variant_level=1))
764
def __del__(self, *args, **kwargs):
766
self.remove_from_connection()
769
if hasattr(DBusObjectWithProperties, u"__del__"):
770
DBusObjectWithProperties.__del__(self, *args, **kwargs)
771
Client.__del__(self, *args, **kwargs)
773
def checker_callback(self, pid, condition, command,
775
self.checker_callback_tag = None
778
self.PropertyChanged(dbus.String(u"CheckerRunning"),
779
dbus.Boolean(False, variant_level=1))
780
if os.WIFEXITED(condition):
781
exitstatus = os.WEXITSTATUS(condition)
783
self.CheckerCompleted(dbus.Int16(exitstatus),
784
dbus.Int64(condition),
785
dbus.String(command))
788
self.CheckerCompleted(dbus.Int16(-1),
789
dbus.Int64(condition),
790
dbus.String(command))
792
return Client.checker_callback(self, pid, condition, command,
795
def checked_ok(self, *args, **kwargs):
796
r = Client.checked_ok(self, *args, **kwargs)
798
self.PropertyChanged(
799
dbus.String(u"LastCheckedOK"),
800
(self._datetime_to_dbus(self.last_checked_ok,
804
def start_checker(self, *args, **kwargs):
805
old_checker = self.checker
806
if self.checker is not None:
807
old_checker_pid = self.checker.pid
809
old_checker_pid = None
810
r = Client.start_checker(self, *args, **kwargs)
811
# Only if new checker process was started
812
if (self.checker is not None
813
and old_checker_pid != self.checker.pid):
815
self.CheckerStarted(self.current_checker_command)
816
self.PropertyChanged(
817
dbus.String(u"CheckerRunning"),
818
dbus.Boolean(True, variant_level=1))
821
def stop_checker(self, *args, **kwargs):
822
old_checker = getattr(self, u"checker", None)
823
r = Client.stop_checker(self, *args, **kwargs)
824
if (old_checker is not None
825
and getattr(self, u"checker", None) is None):
826
self.PropertyChanged(dbus.String(u"CheckerRunning"),
827
dbus.Boolean(False, variant_level=1))
830
def _reset_approved(self):
831
self._approved = None
834
def approve(self, value=True):
835
self.send_changedstate()
836
self._approved = value
837
gobject.timeout_add(self._timedelta_to_milliseconds
838
(self.approval_duration),
839
self._reset_approved)
842
## D-Bus methods, signals & properties
843
_interface = u"se.bsnet.fukt.Mandos.Client"
847
# CheckerCompleted - signal
848
@dbus.service.signal(_interface, signature=u"nxs")
849
def CheckerCompleted(self, exitcode, waitstatus, command):
853
# CheckerStarted - signal
854
@dbus.service.signal(_interface, signature=u"s")
855
def CheckerStarted(self, command):
859
# PropertyChanged - signal
860
@dbus.service.signal(_interface, signature=u"sv")
861
def PropertyChanged(self, property, value):
866
@dbus.service.signal(_interface)
869
Is sent after a successful transfer of secret from the Mandos
870
server to mandos-client
875
@dbus.service.signal(_interface, signature=u"s")
876
def Rejected(self, reason):
880
# NeedApproval - signal
881
@dbus.service.signal(_interface, signature=u"tb")
882
def NeedApproval(self, timeout, default):
889
@dbus.service.method(_interface, in_signature=u"b")
890
def Approve(self, value):
894
@dbus.service.method(_interface)
896
return self.checked_ok()
899
@dbus.service.method(_interface)
904
# StartChecker - method
905
@dbus.service.method(_interface)
906
def StartChecker(self):
911
@dbus.service.method(_interface)
916
# StopChecker - method
917
@dbus.service.method(_interface)
918
def StopChecker(self):
923
# ApprovalPending - property
924
@dbus_service_property(_interface, signature=u"b", access=u"read")
925
def ApprovalPending_dbus_property(self):
926
return dbus.Boolean(bool(self.approvals_pending))
928
# ApprovedByDefault - property
929
@dbus_service_property(_interface, signature=u"b",
931
def ApprovedByDefault_dbus_property(self, value=None):
932
if value is None: # get
933
return dbus.Boolean(self.approved_by_default)
934
self.approved_by_default = bool(value)
936
self.PropertyChanged(dbus.String(u"ApprovedByDefault"),
937
dbus.Boolean(value, variant_level=1))
939
# ApprovalDelay - property
940
@dbus_service_property(_interface, signature=u"t",
942
def ApprovalDelay_dbus_property(self, value=None):
943
if value is None: # get
944
return dbus.UInt64(self.approval_delay_milliseconds())
945
self.approval_delay = datetime.timedelta(0, 0, 0, value)
947
self.PropertyChanged(dbus.String(u"ApprovalDelay"),
948
dbus.UInt64(value, variant_level=1))
950
# ApprovalDuration - property
951
@dbus_service_property(_interface, signature=u"t",
953
def ApprovalDuration_dbus_property(self, value=None):
954
if value is None: # get
955
return dbus.UInt64(self._timedelta_to_milliseconds(
956
self.approval_duration))
957
self.approval_duration = datetime.timedelta(0, 0, 0, value)
959
self.PropertyChanged(dbus.String(u"ApprovalDuration"),
960
dbus.UInt64(value, variant_level=1))
963
@dbus_service_property(_interface, signature=u"s", access=u"read")
964
def Name_dbus_property(self):
965
return dbus.String(self.name)
967
# Fingerprint - property
968
@dbus_service_property(_interface, signature=u"s", access=u"read")
969
def Fingerprint_dbus_property(self):
970
return dbus.String(self.fingerprint)
973
@dbus_service_property(_interface, signature=u"s",
975
def Host_dbus_property(self, value=None):
976
if value is None: # get
977
return dbus.String(self.host)
980
self.PropertyChanged(dbus.String(u"Host"),
981
dbus.String(value, variant_level=1))
984
@dbus_service_property(_interface, signature=u"s", access=u"read")
985
def Created_dbus_property(self):
986
return dbus.String(self._datetime_to_dbus(self.created))
988
# LastEnabled - property
989
@dbus_service_property(_interface, signature=u"s", access=u"read")
990
def LastEnabled_dbus_property(self):
991
if self.last_enabled is None:
992
return dbus.String(u"")
993
return dbus.String(self._datetime_to_dbus(self.last_enabled))
996
@dbus_service_property(_interface, signature=u"b",
998
def Enabled_dbus_property(self, value=None):
999
if value is None: # get
1000
return dbus.Boolean(self.enabled)
1006
# LastCheckedOK - property
1007
@dbus_service_property(_interface, signature=u"s",
1008
access=u"readwrite")
1009
def LastCheckedOK_dbus_property(self, value=None):
1010
if value is not None:
371
def still_valid(self):
372
"""Has the timeout not yet passed for this client?"""
373
now = datetime.datetime.now()
1013
374
if self.last_checked_ok is None:
1014
return dbus.String(u"")
1015
return dbus.String(self._datetime_to_dbus(self
1018
# Timeout - property
1019
@dbus_service_property(_interface, signature=u"t",
1020
access=u"readwrite")
1021
def Timeout_dbus_property(self, value=None):
1022
if value is None: # get
1023
return dbus.UInt64(self.timeout_milliseconds())
1024
self.timeout = datetime.timedelta(0, 0, 0, value)
1026
self.PropertyChanged(dbus.String(u"Timeout"),
1027
dbus.UInt64(value, variant_level=1))
1028
if getattr(self, u"disable_initiator_tag", None) is None:
1030
# Reschedule timeout
1031
gobject.source_remove(self.disable_initiator_tag)
1032
self.disable_initiator_tag = None
1033
time_to_die = (self.
1034
_timedelta_to_milliseconds((self
1039
if time_to_die <= 0:
1040
# The timeout has passed
1043
self.disable_initiator_tag = (gobject.timeout_add
1044
(time_to_die, self.disable))
1046
# Interval - property
1047
@dbus_service_property(_interface, signature=u"t",
1048
access=u"readwrite")
1049
def Interval_dbus_property(self, value=None):
1050
if value is None: # get
1051
return dbus.UInt64(self.interval_milliseconds())
1052
self.interval = datetime.timedelta(0, 0, 0, value)
1054
self.PropertyChanged(dbus.String(u"Interval"),
1055
dbus.UInt64(value, variant_level=1))
1056
if getattr(self, u"checker_initiator_tag", None) is None:
1058
# Reschedule checker run
1059
gobject.source_remove(self.checker_initiator_tag)
1060
self.checker_initiator_tag = (gobject.timeout_add
1061
(value, self.start_checker))
1062
self.start_checker() # Start one now, too
1064
# Checker - property
1065
@dbus_service_property(_interface, signature=u"s",
1066
access=u"readwrite")
1067
def Checker_dbus_property(self, value=None):
1068
if value is None: # get
1069
return dbus.String(self.checker_command)
1070
self.checker_command = value
1072
self.PropertyChanged(dbus.String(u"Checker"),
1073
dbus.String(self.checker_command,
1076
# CheckerRunning - property
1077
@dbus_service_property(_interface, signature=u"b",
1078
access=u"readwrite")
1079
def CheckerRunning_dbus_property(self, value=None):
1080
if value is None: # get
1081
return dbus.Boolean(self.checker is not None)
1083
self.start_checker()
1087
# ObjectPath - property
1088
@dbus_service_property(_interface, signature=u"o", access=u"read")
1089
def ObjectPath_dbus_property(self):
1090
return self.dbus_object_path # is already a dbus.ObjectPath
1093
@dbus_service_property(_interface, signature=u"ay",
1094
access=u"write", byte_arrays=True)
1095
def Secret_dbus_property(self, value):
1096
self.secret = str(value)
1101
class ProxyClient(object):
1102
def __init__(self, child_pipe, fpr, address):
1103
self._pipe = child_pipe
1104
self._pipe.send(('init', fpr, address))
1105
if not self._pipe.recv():
1108
def __getattribute__(self, name):
1109
if(name == '_pipe'):
1110
return super(ProxyClient, self).__getattribute__(name)
1111
self._pipe.send(('getattr', name))
1112
data = self._pipe.recv()
1113
if data[0] == 'data':
1115
if data[0] == 'function':
1116
def func(*args, **kwargs):
1117
self._pipe.send(('funcall', name, args, kwargs))
1118
return self._pipe.recv()[1]
1121
def __setattr__(self, name, value):
1122
if(name == '_pipe'):
1123
return super(ProxyClient, self).__setattr__(name, value)
1124
self._pipe.send(('setattr', name, value))
1127
class ClientHandler(socketserver.BaseRequestHandler, object):
1128
"""A class to handle client connections.
1130
Instantiated once for each connection to handle it.
375
return now < (self.created + self.timeout)
377
return now < (self.last_checked_ok + self.timeout)
380
def peer_certificate(session):
381
"Return the peer's OpenPGP certificate as a bytestring"
382
# If not an OpenPGP certificate...
383
if gnutls.library.functions.gnutls_certificate_type_get\
384
(session._c_object) \
385
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
386
# ...do the normal thing
387
return session.peer_certificate
388
list_size = ctypes.c_uint()
389
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
390
(session._c_object, ctypes.byref(list_size))
391
if list_size.value == 0:
394
return ctypes.string_at(cert.data, cert.size)
397
def fingerprint(openpgp):
398
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
399
# New empty GnuTLS certificate
400
crt = gnutls.library.types.gnutls_openpgp_crt_t()
401
gnutls.library.functions.gnutls_openpgp_crt_init\
403
# New GnuTLS "datum" with the OpenPGP public key
404
datum = gnutls.library.types.gnutls_datum_t\
405
(ctypes.cast(ctypes.c_char_p(openpgp),
406
ctypes.POINTER(ctypes.c_ubyte)),
407
ctypes.c_uint(len(openpgp)))
408
# Import the OpenPGP public key into the certificate
409
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
412
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
413
# New buffer for the fingerprint
414
buffer = ctypes.create_string_buffer(20)
415
buffer_length = ctypes.c_size_t()
416
# Get the fingerprint from the certificate into the buffer
417
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
418
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
419
# Deinit the certificate
420
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
421
# Convert the buffer to a Python bytestring
422
fpr = ctypes.string_at(buffer, buffer_length.value)
423
# Convert the bytestring to hexadecimal notation
424
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
429
"""A TCP request handler class.
430
Instantiated by IPv6_TCPServer for each request to handle it.
1131
431
Note: This will run in its own forked process."""
1133
433
def handle(self):
1134
with contextlib.closing(self.server.child_pipe) as child_pipe:
1135
logger.info(u"TCP connection from: %s",
1136
unicode(self.client_address))
1137
logger.debug(u"Pipe FD: %d",
1138
self.server.child_pipe.fileno())
1140
session = (gnutls.connection
1141
.ClientSession(self.request,
1143
.X509Credentials()))
1145
# Note: gnutls.connection.X509Credentials is really a
1146
# generic GnuTLS certificate credentials object so long as
1147
# no X.509 keys are added to it. Therefore, we can use it
1148
# here despite using OpenPGP certificates.
1150
#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
1151
# u"+AES-256-CBC", u"+SHA1",
1152
# u"+COMP-NULL", u"+CTYPE-OPENPGP",
1154
# Use a fallback default, since this MUST be set.
1155
priority = self.server.gnutls_priority
1156
if priority is None:
1157
priority = u"NORMAL"
1158
(gnutls.library.functions
1159
.gnutls_priority_set_direct(session._c_object,
1162
# Start communication using the Mandos protocol
1163
# Get protocol number
1164
line = self.request.makefile().readline()
1165
logger.debug(u"Protocol version: %r", line)
1167
if int(line.strip().split()[0]) > 1:
1169
except (ValueError, IndexError, RuntimeError), error:
1170
logger.error(u"Unknown protocol version: %s", error)
1173
# Start GnuTLS connection
1176
except gnutls.errors.GNUTLSError, error:
1177
logger.warning(u"Handshake failed: %s", error)
1178
# Do not run session.bye() here: the session is not
1179
# established. Just abandon the request.
1181
logger.debug(u"Handshake succeeded")
1183
approval_required = False
1186
fpr = self.fingerprint(self.peer_certificate
1188
except (TypeError, gnutls.errors.GNUTLSError), error:
1189
logger.warning(u"Bad certificate: %s", error)
1191
logger.debug(u"Fingerprint: %s", fpr)
1194
client = ProxyClient(child_pipe, fpr,
1195
self.client_address)
1199
if client.approval_delay:
1200
delay = client.approval_delay
1201
client.approvals_pending += 1
1202
approval_required = True
1205
if not client.enabled:
1206
logger.warning(u"Client %s is disabled",
1208
if self.server.use_dbus:
1210
client.Rejected("Disabled")
1213
if client._approved or not client.approval_delay:
1214
#We are approved or approval is disabled
1216
elif client._approved is None:
1217
logger.info(u"Client %s needs approval",
1219
if self.server.use_dbus:
1221
client.NeedApproval(
1222
client.approval_delay_milliseconds(),
1223
client.approved_by_default)
1225
logger.warning(u"Client %s was not approved",
1227
if self.server.use_dbus:
1229
client.Rejected("Denied")
1232
#wait until timeout or approved
1233
#x = float(client._timedelta_to_milliseconds(delay))
1234
time = datetime.datetime.now()
1235
client.changedstate.acquire()
1236
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1237
client.changedstate.release()
1238
time2 = datetime.datetime.now()
1239
if (time2 - time) >= delay:
1240
if not client.approved_by_default:
1241
logger.warning("Client %s timed out while"
1242
" waiting for approval",
1244
if self.server.use_dbus:
1246
client.Rejected("Timed out")
1251
delay -= time2 - time
1254
while sent_size < len(client.secret):
1256
sent = session.send(client.secret[sent_size:])
1257
except (gnutls.errors.GNUTLSError), error:
1258
logger.warning("gnutls send failed")
1260
logger.debug(u"Sent: %d, remaining: %d",
1261
sent, len(client.secret)
1262
- (sent_size + sent))
1265
logger.info(u"Sending secret to %s", client.name)
1266
# bump the timeout as if seen
1268
if self.server.use_dbus:
1273
if approval_required:
1274
client.approvals_pending -= 1
1277
except (gnutls.errors.GNUTLSError), error:
1278
logger.warning("GnuTLS bye failed")
1281
def peer_certificate(session):
1282
"Return the peer's OpenPGP certificate as a bytestring"
1283
# If not an OpenPGP certificate...
1284
if (gnutls.library.functions
1285
.gnutls_certificate_type_get(session._c_object)
1286
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1287
# ...do the normal thing
1288
return session.peer_certificate
1289
list_size = ctypes.c_uint(1)
1290
cert_list = (gnutls.library.functions
1291
.gnutls_certificate_get_peers
1292
(session._c_object, ctypes.byref(list_size)))
1293
if not bool(cert_list) and list_size.value != 0:
1294
raise gnutls.errors.GNUTLSError(u"error getting peer"
1296
if list_size.value == 0:
1299
return ctypes.string_at(cert.data, cert.size)
1302
def fingerprint(openpgp):
1303
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1304
# New GnuTLS "datum" with the OpenPGP public key
1305
datum = (gnutls.library.types
1306
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1309
ctypes.c_uint(len(openpgp))))
1310
# New empty GnuTLS certificate
1311
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1312
(gnutls.library.functions
1313
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1314
# Import the OpenPGP public key into the certificate
1315
(gnutls.library.functions
1316
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1317
gnutls.library.constants
1318
.GNUTLS_OPENPGP_FMT_RAW))
1319
# Verify the self signature in the key
1320
crtverify = ctypes.c_uint()
1321
(gnutls.library.functions
1322
.gnutls_openpgp_crt_verify_self(crt, 0,
1323
ctypes.byref(crtverify)))
1324
if crtverify.value != 0:
1325
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1326
raise (gnutls.errors.CertificateSecurityError
1328
# New buffer for the fingerprint
1329
buf = ctypes.create_string_buffer(20)
1330
buf_len = ctypes.c_size_t()
1331
# Get the fingerprint from the certificate into the buffer
1332
(gnutls.library.functions
1333
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1334
ctypes.byref(buf_len)))
1335
# Deinit the certificate
1336
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1337
# Convert the buffer to a Python bytestring
1338
fpr = ctypes.string_at(buf, buf_len.value)
1339
# Convert the bytestring to hexadecimal notation
1340
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1344
class MultiprocessingMixIn(object):
1345
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1346
def sub_process_main(self, request, address):
1348
self.finish_request(request, address)
1350
self.handle_error(request, address)
1351
self.close_request(request)
1353
def process_request(self, request, address):
1354
"""Start a new process to process the request."""
1355
multiprocessing.Process(target = self.sub_process_main,
1356
args = (request, address)).start()
1358
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1359
""" adds a pipe to the MixIn """
1360
def process_request(self, request, client_address):
1361
"""Overrides and wraps the original process_request().
1363
This function creates a new pipe in self.pipe
1365
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1367
super(MultiprocessingMixInWithPipe,
1368
self).process_request(request, client_address)
1369
self.child_pipe.close()
1370
self.add_pipe(parent_pipe)
1372
def add_pipe(self, parent_pipe):
1373
"""Dummy function; override as necessary"""
1376
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1377
socketserver.TCPServer, object):
1378
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
434
logger.debug(u"TCP connection from: %s",
435
unicode(self.client_address))
437
line = self.request.makefile().readline()
438
logger.debug(u"Protocol version: %r", line)
440
if int(line.strip().split()[0]) > 1:
442
except (ValueError, IndexError, RuntimeError), error:
443
logger.error(u"Unknown protocol version: %s", error)
446
session = gnutls.connection.ClientSession\
447
(self.request, gnutls.connection.X509Credentials())
448
# Note: gnutls.connection.X509Credentials is really a generic
449
# GnuTLS certificate credentials object so long as no X.509
450
# keys are added to it. Therefore, we can use it here despite
451
# using OpenPGP certificates.
453
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
454
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
456
priority = "NORMAL" # Fallback default, since this
458
if self.server.settings["priority"]:
459
priority = self.server.settings["priority"]
460
gnutls.library.functions.gnutls_priority_set_direct\
461
(session._c_object, priority, None);
465
except gnutls.errors.GNUTLSError, error:
466
logger.debug(u"Handshake failed: %s", error)
467
# Do not run session.bye() here: the session is not
468
# established. Just abandon the request.
471
fpr = fingerprint(peer_certificate(session))
472
except (TypeError, gnutls.errors.GNUTLSError), error:
473
logger.debug(u"Bad certificate: %s", error)
476
logger.debug(u"Fingerprint: %s", fpr)
478
for c in self.server.clients:
479
if c.fingerprint == fpr:
483
logger.debug(u"Client not found for fingerprint: %s", fpr)
486
# Have to check if client.still_valid(), since it is possible
487
# that the client timed out while establishing the GnuTLS
489
if not client.still_valid():
490
logger.debug(u"Client %(name)s is invalid", vars(client))
494
while sent_size < len(client.secret):
495
sent = session.send(client.secret[sent_size:])
496
logger.debug(u"Sent: %d, remaining: %d",
497
sent, len(client.secret)
498
- (sent_size + sent))
503
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
504
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1381
enabled: Boolean; whether this server is activated yet
1382
interface: None or a network interface name (string)
1383
use_ipv6: Boolean; to use IPv6 or not
506
settings: Server settings
507
clients: Set() of Client objects
1385
def __init__(self, server_address, RequestHandlerClass,
1386
interface=None, use_ipv6=True):
1387
self.interface = interface
1389
self.address_family = socket.AF_INET6
1390
socketserver.TCPServer.__init__(self, server_address,
1391
RequestHandlerClass)
509
address_family = socket.AF_INET6
510
def __init__(self, *args, **kwargs):
511
if "settings" in kwargs:
512
self.settings = kwargs["settings"]
513
del kwargs["settings"]
514
if "clients" in kwargs:
515
self.clients = kwargs["clients"]
516
del kwargs["clients"]
517
return super(type(self), self).__init__(*args, **kwargs)
1392
518
def server_bind(self):
1393
519
"""This overrides the normal server_bind() function
1394
520
to bind to an interface if one was specified, and also NOT to
1395
521
bind to an address or port if they were not specified."""
1396
if self.interface is not None:
1397
if SO_BINDTODEVICE is None:
1398
logger.error(u"SO_BINDTODEVICE does not exist;"
1399
u" cannot bind to interface %s",
1403
self.socket.setsockopt(socket.SOL_SOCKET,
1407
except socket.error, error:
1408
if error[0] == errno.EPERM:
1409
logger.error(u"No permission to"
1410
u" bind to interface %s",
1412
elif error[0] == errno.ENOPROTOOPT:
1413
logger.error(u"SO_BINDTODEVICE not available;"
1414
u" cannot bind to interface %s",
522
if self.settings["interface"]:
523
# 25 is from /usr/include/asm-i486/socket.h
524
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
526
self.socket.setsockopt(socket.SOL_SOCKET,
528
self.settings["interface"])
529
except socket.error, error:
530
if error[0] == errno.EPERM:
531
logger.warning(u"No permission to"
532
u" bind to interface %s",
533
self.settings["interface"])
1418
536
# Only bind(2) the socket if we really need to.
1419
537
if self.server_address[0] or self.server_address[1]:
1420
538
if not self.server_address[0]:
1421
if self.address_family == socket.AF_INET6:
1422
any_address = u"::" # in6addr_any
1424
any_address = socket.INADDR_ANY
1425
self.server_address = (any_address,
540
self.server_address = (in6addr_any,
1426
541
self.server_address[1])
1427
elif not self.server_address[1]:
542
elif self.server_address[1] is None:
1428
543
self.server_address = (self.server_address[0],
1430
# if self.interface:
1431
# self.server_address = (self.server_address[0],
1436
return socketserver.TCPServer.server_bind(self)
1439
class MandosServer(IPv6_TCPServer):
1443
clients: set of Client objects
1444
gnutls_priority GnuTLS priority string
1445
use_dbus: Boolean; to emit D-Bus signals or not
1447
Assumes a gobject.MainLoop event loop.
1449
def __init__(self, server_address, RequestHandlerClass,
1450
interface=None, use_ipv6=True, clients=None,
1451
gnutls_priority=None, use_dbus=True):
1452
self.enabled = False
1453
self.clients = clients
1454
if self.clients is None:
1455
self.clients = set()
1456
self.use_dbus = use_dbus
1457
self.gnutls_priority = gnutls_priority
1458
IPv6_TCPServer.__init__(self, server_address,
1459
RequestHandlerClass,
1460
interface = interface,
1461
use_ipv6 = use_ipv6)
1462
def server_activate(self):
1464
return socketserver.TCPServer.server_activate(self)
1467
def add_pipe(self, parent_pipe):
1468
# Call "handle_ipc" for both data and EOF events
1469
gobject.io_add_watch(parent_pipe.fileno(),
1470
gobject.IO_IN | gobject.IO_HUP,
1471
functools.partial(self.handle_ipc,
1472
parent_pipe = parent_pipe))
1474
def handle_ipc(self, source, condition, parent_pipe=None,
1475
client_object=None):
1477
gobject.IO_IN: u"IN", # There is data to read.
1478
gobject.IO_OUT: u"OUT", # Data can be written (without
1480
gobject.IO_PRI: u"PRI", # There is urgent data to read.
1481
gobject.IO_ERR: u"ERR", # Error condition.
1482
gobject.IO_HUP: u"HUP" # Hung up (the connection has been
1483
# broken, usually for pipes and
1486
conditions_string = ' | '.join(name
1488
condition_names.iteritems()
1489
if cond & condition)
1490
logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
1493
# error or the other end of multiprocessing.Pipe has closed
1494
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1497
# Read a request from the child
1498
request = parent_pipe.recv()
1499
logger.debug(u"IPC request: %s", repr(request))
1500
command = request[0]
1502
if command == 'init':
1504
address = request[2]
1506
for c in self.clients:
1507
if c.fingerprint == fpr:
1511
logger.warning(u"Client not found for fingerprint: %s, ad"
1512
u"dress: %s", fpr, address)
1515
mandos_dbus_service.ClientNotFound(fpr, address)
1516
parent_pipe.send(False)
1519
gobject.io_add_watch(parent_pipe.fileno(),
1520
gobject.IO_IN | gobject.IO_HUP,
1521
functools.partial(self.handle_ipc,
1522
parent_pipe = parent_pipe,
1523
client_object = client))
1524
parent_pipe.send(True)
1525
# remove the old hook in favor of the new above hook on same fileno
1527
if command == 'funcall':
1528
funcname = request[1]
1532
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1534
if command == 'getattr':
1535
attrname = request[1]
1536
if callable(client_object.__getattribute__(attrname)):
1537
parent_pipe.send(('function',))
1539
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1541
if command == 'setattr':
1542
attrname = request[1]
1544
setattr(client_object, attrname, value)
545
return super(type(self), self).server_bind()
1549
548
def string_to_delta(interval):
1550
549
"""Parse a string and return a datetime.timedelta
1552
>>> string_to_delta(u'7d')
551
>>> string_to_delta('7d')
1553
552
datetime.timedelta(7)
1554
>>> string_to_delta(u'60s')
553
>>> string_to_delta('60s')
1555
554
datetime.timedelta(0, 60)
1556
>>> string_to_delta(u'60m')
555
>>> string_to_delta('60m')
1557
556
datetime.timedelta(0, 3600)
1558
>>> string_to_delta(u'24h')
557
>>> string_to_delta('24h')
1559
558
datetime.timedelta(1)
1560
559
>>> string_to_delta(u'1w')
1561
560
datetime.timedelta(7)
1562
>>> string_to_delta(u'5m 30s')
1563
datetime.timedelta(0, 330)
1565
timevalue = datetime.timedelta(0)
1566
for s in interval.split():
1568
suffix = unicode(s[-1])
1571
delta = datetime.timedelta(value)
1572
elif suffix == u"s":
1573
delta = datetime.timedelta(0, value)
1574
elif suffix == u"m":
1575
delta = datetime.timedelta(0, 0, 0, 0, value)
1576
elif suffix == u"h":
1577
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1578
elif suffix == u"w":
1579
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1581
raise ValueError(u"Unknown suffix %r" % suffix)
1582
except (ValueError, IndexError), e:
1583
raise ValueError(e.message)
1588
def if_nametoindex(interface):
1589
"""Call the C function if_nametoindex(), or equivalent
563
suffix=unicode(interval[-1])
564
value=int(interval[:-1])
566
delta = datetime.timedelta(value)
568
delta = datetime.timedelta(0, value)
570
delta = datetime.timedelta(0, 0, 0, 0, value)
572
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
574
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
577
except (ValueError, IndexError):
582
def server_state_changed(state):
583
"""Derived from the Avahi example code"""
584
if state == avahi.SERVER_COLLISION:
585
logger.warning(u"Server name collision")
587
elif state == avahi.SERVER_RUNNING:
591
def entry_group_state_changed(state, error):
592
"""Derived from the Avahi example code"""
593
logger.debug(u"state change: %i", state)
1591
Note: This function cannot accept a unicode string."""
1592
global if_nametoindex
595
if state == avahi.ENTRY_GROUP_ESTABLISHED:
596
logger.debug(u"Service established.")
597
elif state == avahi.ENTRY_GROUP_COLLISION:
598
logger.warning(u"Service name collision.")
600
elif state == avahi.ENTRY_GROUP_FAILURE:
601
logger.critical(u"Error in group state changed %s",
603
raise AvahiGroupError("State changed: %s", str(error))
605
def if_nametoindex(interface, _func=[None]):
606
"""Call the C function if_nametoindex(), or equivalent"""
607
if _func[0] is not None:
608
return _func[0](interface)
1594
if_nametoindex = (ctypes.cdll.LoadLibrary
1595
(ctypes.util.find_library(u"c"))
610
if "ctypes.util" not in sys.modules:
614
libc = ctypes.cdll.LoadLibrary\
615
(ctypes.util.find_library("c"))
616
_func[0] = libc.if_nametoindex
617
return _func[0](interface)
1597
621
except (OSError, AttributeError):
1598
logger.warning(u"Doing if_nametoindex the hard way")
1599
def if_nametoindex(interface):
622
if "struct" not in sys.modules:
624
if "fcntl" not in sys.modules:
626
def the_hard_way(interface):
1600
627
"Get an interface index the hard way, i.e. using fcntl()"
1601
628
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1602
with contextlib.closing(socket.socket()) as s:
1603
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1604
struct.pack(str(u"16s16x"),
1606
interface_index = struct.unpack(str(u"I"),
630
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
631
struct.pack("16s16x", interface))
633
interface_index = struct.unpack("I", ifreq[16:20])[0]
1608
634
return interface_index
1609
return if_nametoindex(interface)
1612
def daemon(nochdir = False, noclose = False):
635
_func[0] = the_hard_way
636
return _func[0](interface)
639
def daemon(nochdir, noclose):
1613
640
"""See daemon(3). Standard BSD Unix function.
1615
641
This should really exist as os.daemon, but it doesn't (yet)."""
1624
648
# Close all standard open file descriptors
1625
649
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1626
650
if not stat.S_ISCHR(os.fstat(null).st_mode):
1627
651
raise OSError(errno.ENODEV,
1628
u"%s not a character device"
652
"/dev/null not a character device")
1630
653
os.dup2(null, sys.stdin.fileno())
1631
654
os.dup2(null, sys.stdout.fileno())
1632
655
os.dup2(null, sys.stderr.fileno())
1676
691
# Default values for config file for server-global settings
1677
server_defaults = { u"interface": u"",
1682
u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1683
u"servicename": u"Mandos",
1684
u"use_dbus": u"True",
1685
u"use_ipv6": u"True",
692
server_defaults = { "interface": "",
697
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
698
"servicename": "Mandos",
1689
701
# Parse config file for server-global settings
1690
server_config = configparser.SafeConfigParser(server_defaults)
702
server_config = ConfigParser.SafeConfigParser(server_defaults)
1691
703
del server_defaults
1692
server_config.read(os.path.join(options.configdir,
704
server_config.read(os.path.join(options.configdir, "server.conf"))
705
server_section = "server"
1694
706
# Convert the SafeConfigParser object to a dict
1695
server_settings = server_config.defaults()
1696
# Use the appropriate methods on the non-string config options
1697
for option in (u"debug", u"use_dbus", u"use_ipv6"):
1698
server_settings[option] = server_config.getboolean(u"DEFAULT",
1700
if server_settings["port"]:
1701
server_settings["port"] = server_config.getint(u"DEFAULT",
707
server_settings = dict(server_config.items(server_section))
708
# Use getboolean on the boolean config option
709
server_settings["debug"] = server_config.getboolean\
710
(server_section, "debug")
1703
711
del server_config
1705
713
# Override the settings from the config file with command line
1706
714
# options, if set.
1707
for option in (u"interface", u"address", u"port", u"debug",
1708
u"priority", u"servicename", u"configdir",
1709
u"use_dbus", u"use_ipv6", u"debuglevel"):
715
for option in ("interface", "address", "port", "debug",
716
"priority", "servicename", "configdir"):
1710
717
value = getattr(options, option)
1711
718
if value is not None:
1712
719
server_settings[option] = value
1714
# Force all strings to be unicode
1715
for option in server_settings.keys():
1716
if type(server_settings[option]) is str:
1717
server_settings[option] = unicode(server_settings[option])
1718
721
# Now we have our good server settings in "server_settings"
1720
##################################################################
1723
debug = server_settings[u"debug"]
1724
debuglevel = server_settings[u"debuglevel"]
1725
use_dbus = server_settings[u"use_dbus"]
1726
use_ipv6 = server_settings[u"use_ipv6"]
1728
if server_settings[u"servicename"] != u"Mandos":
1729
syslogger.setFormatter(logging.Formatter
1730
(u'Mandos (%s) [%%(process)d]:'
1731
u' %%(levelname)s: %%(message)s'
1732
% server_settings[u"servicename"]))
1734
723
# Parse config file with clients
1735
client_defaults = { u"timeout": u"1h",
1737
u"checker": u"fping -q -- %%(host)s",
1739
u"approval_delay": u"0s",
1740
u"approval_duration": u"1s",
724
client_defaults = { "timeout": "1h",
726
"checker": "fping -q -- %%(fqdn)s",
1742
client_config = configparser.SafeConfigParser(client_defaults)
1743
client_config.read(os.path.join(server_settings[u"configdir"],
1746
global mandos_dbus_service
1747
mandos_dbus_service = None
1749
tcp_server = MandosServer((server_settings[u"address"],
1750
server_settings[u"port"]),
1752
interface=(server_settings[u"interface"]
1756
server_settings[u"priority"],
1758
pidfilename = u"/var/run/mandos.pid"
1760
pidfile = open(pidfilename, u"w")
1762
logger.error(u"Could not open file %r", pidfilename)
1765
uid = pwd.getpwnam(u"_mandos").pw_uid
1766
gid = pwd.getpwnam(u"_mandos").pw_gid
1769
uid = pwd.getpwnam(u"mandos").pw_uid
1770
gid = pwd.getpwnam(u"mandos").pw_gid
1773
uid = pwd.getpwnam(u"nobody").pw_uid
1774
gid = pwd.getpwnam(u"nobody").pw_gid
1781
except OSError, error:
1782
if error[0] != errno.EPERM:
1785
if not debug and not debuglevel:
1786
syslogger.setLevel(logging.WARNING)
1787
console.setLevel(logging.WARNING)
1789
level = getattr(logging, debuglevel.upper())
1790
syslogger.setLevel(level)
1791
console.setLevel(level)
1794
# Enable all possible GnuTLS debugging
1796
# "Use a log level over 10 to enable all debugging options."
1798
gnutls.library.functions.gnutls_global_set_log_level(11)
1800
@gnutls.library.types.gnutls_log_func
1801
def debug_gnutls(level, string):
1802
logger.debug(u"GnuTLS: %s", string[:-1])
1804
(gnutls.library.functions
1805
.gnutls_global_set_log_function(debug_gnutls))
1807
# Redirect stdin so all checkers get /dev/null
1808
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1809
os.dup2(null, sys.stdin.fileno())
1813
# No console logging
1814
logger.removeHandler(console)
728
client_config = ConfigParser.SafeConfigParser(client_defaults)
729
client_config.read(os.path.join(server_settings["configdir"],
733
service = AvahiService(name = server_settings["servicename"],
734
type = "_mandos._tcp", );
735
if server_settings["interface"]:
736
service.interface = if_nametoindex(server_settings["interface"])
1817
738
global main_loop
1818
741
# From the Avahi example code
1819
742
DBusGMainLoop(set_as_default=True )
1820
743
main_loop = gobject.MainLoop()
1821
744
bus = dbus.SystemBus()
745
server = dbus.Interface(
746
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
747
avahi.DBUS_INTERFACE_SERVER )
1822
748
# End of Avahi example code
1825
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
1826
bus, do_not_queue=True)
1827
except dbus.exceptions.NameExistsException, e:
1828
logger.error(unicode(e) + u", disabling D-Bus")
1830
server_settings[u"use_dbus"] = False
1831
tcp_server.use_dbus = False
1832
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1833
service = AvahiService(name = server_settings[u"servicename"],
1834
servicetype = u"_mandos._tcp",
1835
protocol = protocol, bus = bus)
1836
if server_settings["interface"]:
1837
service.interface = (if_nametoindex
1838
(str(server_settings[u"interface"])))
750
debug = server_settings["debug"]
753
console = logging.StreamHandler()
754
# console.setLevel(logging.DEBUG)
755
console.setFormatter(logging.Formatter\
756
('%(levelname)s: %(message)s'))
757
logger.addHandler(console)
761
def remove_from_clients(client):
762
clients.remove(client)
764
logger.debug(u"No clients left, exiting")
767
clients.update(Set(Client(name=section,
768
stop_hook = remove_from_clients,
769
**(dict(client_config\
771
for section in client_config.sections()))
1841
# Close all input and output, do double fork, etc.
1844
global multiprocessing_manager
1845
multiprocessing_manager = multiprocessing.Manager()
1847
client_class = Client
1849
client_class = functools.partial(ClientDBus, bus = bus)
1850
def client_config_items(config, section):
1851
special_settings = {
1852
"approved_by_default":
1853
lambda: config.getboolean(section,
1854
"approved_by_default"),
1856
for name, value in config.items(section):
1858
yield (name, special_settings[name]())
1862
tcp_server.clients.update(set(
1863
client_class(name = section,
1864
config= dict(client_config_items(
1865
client_config, section)))
1866
for section in client_config.sections()))
1867
if not tcp_server.clients:
1868
logger.warning(u"No clients defined")
1873
pidfile.write(str(pid) + "\n")
1876
logger.error(u"Could not write to file %r with PID %d",
1879
# "pidfile" was never created
777
"Cleanup function; run on exit"
779
# From the Avahi example code
780
if not group is None:
783
# End of Avahi example code
786
client = clients.pop()
787
client.stop_hook = None
790
atexit.register(cleanup)
1884
793
signal.signal(signal.SIGINT, signal.SIG_IGN)
1885
794
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1886
795
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1889
class MandosDBusService(dbus.service.Object):
1890
"""A D-Bus proxy object"""
1892
dbus.service.Object.__init__(self, bus, u"/")
1893
_interface = u"se.bsnet.fukt.Mandos"
1895
@dbus.service.signal(_interface, signature=u"o")
1896
def ClientAdded(self, objpath):
1900
@dbus.service.signal(_interface, signature=u"ss")
1901
def ClientNotFound(self, fingerprint, address):
1905
@dbus.service.signal(_interface, signature=u"os")
1906
def ClientRemoved(self, objpath, name):
1910
@dbus.service.method(_interface, out_signature=u"ao")
1911
def GetAllClients(self):
1913
return dbus.Array(c.dbus_object_path
1914
for c in tcp_server.clients)
1916
@dbus.service.method(_interface,
1917
out_signature=u"a{oa{sv}}")
1918
def GetAllClientsWithProperties(self):
1920
return dbus.Dictionary(
1921
((c.dbus_object_path, c.GetAll(u""))
1922
for c in tcp_server.clients),
1923
signature=u"oa{sv}")
1925
@dbus.service.method(_interface, in_signature=u"o")
1926
def RemoveClient(self, object_path):
1928
for c in tcp_server.clients:
1929
if c.dbus_object_path == object_path:
1930
tcp_server.clients.remove(c)
1931
c.remove_from_connection()
1932
# Don't signal anything except ClientRemoved
1933
c.disable(quiet=True)
1935
self.ClientRemoved(object_path, c.name)
1937
raise KeyError(object_path)
1941
mandos_dbus_service = MandosDBusService()
1944
"Cleanup function; run on exit"
1947
while tcp_server.clients:
1948
client = tcp_server.clients.pop()
1950
client.remove_from_connection()
1951
client.disable_hook = None
1952
# Don't signal anything except ClientRemoved
1953
client.disable(quiet=True)
1956
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1959
atexit.register(cleanup)
1961
for client in tcp_server.clients:
1964
mandos_dbus_service.ClientAdded(client.dbus_object_path)
1968
tcp_server.server_activate()
797
for client in clients:
800
tcp_server = IPv6_TCPServer((server_settings["address"],
801
server_settings["port"]),
803
settings=server_settings,
1970
805
# Find out what port we got
1971
806
service.port = tcp_server.socket.getsockname()[1]
1973
logger.info(u"Now listening on address %r, port %d,"
1974
" flowinfo %d, scope_id %d"
1975
% tcp_server.socket.getsockname())
1977
logger.info(u"Now listening on address %r, port %d"
1978
% tcp_server.socket.getsockname())
807
logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
808
u" scope_id %d" % tcp_server.socket.getsockname())
1980
810
#service.interface = tcp_server.socket.getsockname()[3]
1983
813
# From the Avahi example code
814
server.connect_to_signal("StateChanged", server_state_changed)
816
server_state_changed(server.GetState())
1986
817
except dbus.exceptions.DBusException, error:
1987
818
logger.critical(u"DBusException: %s", error)
1990
820
# End of Avahi example code
1992
822
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1993
823
lambda *args, **kwargs:
1994
(tcp_server.handle_request
1995
(*args[2:], **kwargs) or True))
824
tcp_server.handle_request\
825
(*args[2:], **kwargs) or True)
1997
logger.debug(u"Starting main loop")
827
logger.debug("Starting main loop")
828
main_loop_started = True
1999
830
except AvahiError, error:
2000
logger.critical(u"AvahiError: %s", error)
831
logger.critical(u"AvahiError: %s" + unicode(error))
2003
833
except KeyboardInterrupt:
2006
logger.debug(u"Server received KeyboardInterrupt")
2007
logger.debug(u"Server exiting")
2008
# Must run before the D-Bus bus name gets deregistered
2011
837
if __name__ == '__main__':