57
import logging.handlers
59
from contextlib import closing
65
31
from dbus.mainloop.glib import DBusGMainLoop
35
import logging.handlers
71
37
logger = logging.Logger('mandos')
72
syslogger = (logging.handlers.SysLogHandler
73
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
address = "/dev/log"))
75
syslogger.setFormatter(logging.Formatter
76
('Mandos: %(levelname)s: %(message)s'))
38
syslogger = logging.handlers.SysLogHandler\
39
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
40
syslogger.setFormatter(logging.Formatter\
41
('%(levelname)s: %(message)s'))
77
42
logger.addHandler(syslogger)
79
console = logging.StreamHandler()
80
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
82
logger.addHandler(console)
84
class AvahiError(Exception):
85
def __init__(self, value):
87
super(AvahiError, self).__init__()
89
return repr(self.value)
91
class AvahiServiceError(AvahiError):
94
class AvahiGroupError(AvahiError):
98
class AvahiService(object):
99
"""An Avahi (Zeroconf) service.
101
interface: integer; avahi.IF_UNSPEC or an interface index.
102
Used to optionally bind to the specified interface.
103
name: string; Example: 'Mandos'
104
type: string; Example: '_mandos._tcp'.
105
See <http://www.dns-sd.org/ServiceTypes.html>
106
port: integer; what port to announce
107
TXT: list of strings; TXT record for the service
108
domain: string; Domain to publish on, default to .local if empty.
109
host: string; Host to publish records for, default is 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
114
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
servicetype = None, port = None, TXT = None,
116
domain = "", host = "", max_renames = 32768):
117
self.interface = interface
119
self.type = servicetype
121
self.TXT = TXT if TXT is not None else []
124
self.rename_count = 0
125
self.max_renames = max_renames
127
"""Derived from the Avahi example code"""
128
if self.rename_count >= self.max_renames:
129
logger.critical(u"No suitable Zeroconf service name found"
130
u" after %i retries, exiting.",
132
raise AvahiServiceError("Too many renames")
133
self.name = server.GetAlternativeServiceName(self.name)
134
logger.info(u"Changing Zeroconf service name to %r ...",
136
syslogger.setFormatter(logging.Formatter
137
('Mandos (%s): %%(levelname)s:'
138
' %%(message)s' % self.name))
141
self.rename_count += 1
143
"""Derived from the Avahi example code"""
144
if group is not None:
147
"""Derived from the Avahi example code"""
150
group = dbus.Interface(bus.get_object
152
server.EntryGroupNew()),
153
avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
group.connect_to_signal('StateChanged',
155
entry_group_state_changed)
156
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
157
service.name, service.type)
159
self.interface, # interface
160
avahi.PROTO_INET6, # protocol
161
dbus.UInt32(0), # flags
162
self.name, self.type,
163
self.domain, self.host,
164
dbus.UInt16(self.port),
165
avahi.string_array_to_txt_array(self.TXT))
168
# From the Avahi example code:
169
group = None # our entry group
45
# This variable is used to optionally bind to a specified interface.
46
# It is a global variable to fit in with the other variables from the
47
# Avahi server example code.
48
serviceInterface = avahi.IF_UNSPEC
49
# From the Avahi server example code:
50
serviceName = "Mandos"
51
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
52
servicePort = None # Not known at startup
53
serviceTXT = [] # TXT record for the service
54
domain = "" # Domain to publish on, default to .local
55
host = "" # Host to publish records for, default to localhost
56
group = None #our entry group
57
rename_count = 12 # Counter so we only rename after collisions a
58
# sensible number of times
170
59
# End of Avahi example code
173
class Client(dbus.service.Object):
174
63
"""A representation of a client host served by this server.
176
65
name: string; from the config file, used in log messages
177
66
fingerprint: string (40 or 32 hexadecimal digits); used to
178
67
uniquely identify the client
179
68
secret: bytestring; sent verbatim (over TLS) to client
180
host: string; available for use by the checker command
181
created: datetime.datetime(); (UTC) object creation
182
started: datetime.datetime(); (UTC) last started
183
last_checked_ok: datetime.datetime(); (UTC) or None
184
timeout: datetime.timedelta(); How long from last_checked_ok
185
until this client is invalid
69
fqdn: string (FQDN); available for use by the checker command
70
created: datetime.datetime()
71
last_seen: datetime.datetime() or None if not yet seen
72
timeout: datetime.timedelta(); How long from last_seen until
73
this client is invalid
186
74
interval: datetime.timedelta(); How often to start a new checker
187
75
stop_hook: If set, called by stop() as stop_hook(self)
188
76
checker: subprocess.Popen(); a running checker process used
189
77
to see if the client lives.
190
'None' if no process is running.
78
Is None if no process is running.
191
79
checker_initiator_tag: a gobject event source tag, or None
192
80
stop_initiator_tag: - '' -
193
81
checker_callback_tag: - '' -
194
82
checker_command: string; External command which is run to check if
195
client lives. %() expansions are done at
83
client lives. %()s expansions are done at
196
84
runtime with vars(self) as dict, so that for
197
85
instance %(name)s can be used in the command.
198
86
Private attibutes:
199
87
_timeout: Real variable for 'timeout'
200
88
_interval: Real variable for 'interval'
201
_timeout_milliseconds: Used when calling gobject.timeout_add()
89
_timeout_milliseconds: Used by gobject.timeout_add()
202
90
_interval_milliseconds: - '' -
204
92
def _set_timeout(self, timeout):
205
"Setter function for the 'timeout' attribute"
93
"Setter function for 'timeout' attribute"
206
94
self._timeout = timeout
207
95
self._timeout_milliseconds = ((self.timeout.days
208
96
* 24 * 60 * 60 * 1000)
209
97
+ (self.timeout.seconds * 1000)
210
98
+ (self.timeout.microseconds
213
self.TimeoutChanged(self._timeout_milliseconds)
214
timeout = property(lambda self: self._timeout, _set_timeout)
100
timeout = property(lambda self: self._timeout,
217
103
def _set_interval(self, interval):
218
"Setter function for the 'interval' attribute"
104
"Setter function for 'interval' attribute"
219
105
self._interval = interval
220
106
self._interval_milliseconds = ((self.interval.days
221
107
* 24 * 60 * 60 * 1000)
224
110
+ (self.interval.microseconds
227
self.IntervalChanged(self._interval_milliseconds)
228
interval = property(lambda self: self._interval, _set_interval)
112
interval = property(lambda self: self._interval,
229
114
del _set_interval
231
def __init__(self, name = None, stop_hook=None, config=None):
232
"""Note: the 'checker' key in 'config' sets the
233
'checker_command' attribute and *not* the 'checker'
235
dbus.service.Object.__init__(self, bus,
237
% name.replace(".", "_"))
115
def __init__(self, name=None, options=None, stop_hook=None,
116
fingerprint=None, secret=None, secfile=None,
117
fqdn=None, timeout=None, interval=-1, checker=None):
241
logger.debug(u"Creating client %r", self.name)
242
# Uppercase and remove spaces from fingerprint for later
243
# comparison purposes with return value from the fingerprint()
245
self.fingerprint = (config["fingerprint"].upper()
247
logger.debug(u" Fingerprint: %s", self.fingerprint)
248
if "secret" in config:
249
self.secret = config["secret"].decode(u"base64")
250
elif "secfile" in config:
251
with closing(open(os.path.expanduser
253
(config["secfile"])))) as secfile:
254
self.secret = secfile.read()
256
raise TypeError(u"No secret or secfile for client %s"
258
self.host = config.get("host", "")
259
self.created = datetime.datetime.utcnow()
261
self.last_checked_ok = None
262
self.timeout = string_to_delta(config["timeout"])
263
self.interval = string_to_delta(config["interval"])
119
# Uppercase and remove spaces from fingerprint
120
# for later comparison purposes with return value of
121
# the fingerprint() function
122
self.fingerprint = fingerprint.upper().replace(u" ", u"")
124
self.secret = secret.decode(u"base64")
127
self.secret = sf.read()
130
raise RuntimeError(u"No secret or secfile for client %s"
132
self.fqdn = fqdn # string
133
self.created = datetime.datetime.now()
134
self.last_seen = None
136
self.timeout = options.timeout
138
self.timeout = string_to_delta(timeout)
140
self.interval = options.interval
142
self.interval = string_to_delta(interval)
264
143
self.stop_hook = stop_hook
265
144
self.checker = None
266
145
self.checker_initiator_tag = None
267
146
self.stop_initiator_tag = None
268
147
self.checker_callback_tag = None
269
self.check_command = config["checker"]
148
self.check_command = checker
272
"""Start this client's checker and timeout hooks"""
273
self.started = datetime.datetime.utcnow()
150
"""Start this clients checker and timeout hooks"""
274
151
# Schedule a new checker to be started an 'interval' from now,
275
152
# and every interval from then on.
276
self.checker_initiator_tag = (gobject.timeout_add
277
(self._interval_milliseconds,
153
self.checker_initiator_tag = gobject.timeout_add\
154
(self._interval_milliseconds,
279
156
# Also start a new checker *right now*.
280
157
self.start_checker()
281
158
# Schedule a stop() when 'timeout' has passed
282
self.stop_initiator_tag = (gobject.timeout_add
283
(self._timeout_milliseconds,
286
self.StateChanged(True)
159
self.stop_initiator_tag = gobject.timeout_add\
160
(self._timeout_milliseconds,
289
"""Stop this client."""
290
if getattr(self, "started", None) is not None:
291
logger.info(u"Stopping client %s", self.name)
294
if getattr(self, "stop_initiator_tag", False):
164
The possibility that this client might be restarted is left
165
open, but not currently used."""
166
logger.debug(u"Stopping client %s", self.name)
168
if self.stop_initiator_tag:
295
169
gobject.source_remove(self.stop_initiator_tag)
296
170
self.stop_initiator_tag = None
297
if getattr(self, "checker_initiator_tag", False):
171
if self.checker_initiator_tag:
298
172
gobject.source_remove(self.checker_initiator_tag)
299
173
self.checker_initiator_tag = None
300
174
self.stop_checker()
301
175
if self.stop_hook:
302
176
self.stop_hook(self)
305
self.StateChanged(False)
306
177
# Do not run this again if called by a gobject.timeout_add
309
179
def __del__(self):
310
self.stop_hook = None
180
# Some code duplication here and in stop()
181
if hasattr(self, "stop_initiator_tag") \
182
and self.stop_initiator_tag:
183
gobject.source_remove(self.stop_initiator_tag)
184
self.stop_initiator_tag = None
185
if hasattr(self, "checker_initiator_tag") \
186
and self.checker_initiator_tag:
187
gobject.source_remove(self.checker_initiator_tag)
188
self.checker_initiator_tag = None
313
190
def checker_callback(self, pid, condition):
314
191
"""The checker has completed, so take appropriate actions."""
315
self.checker_callback_tag = None
317
if (os.WIFEXITED(condition)
318
and (os.WEXITSTATUS(condition) == 0)):
319
logger.info(u"Checker for %(name)s succeeded",
322
self.CheckerCompleted(True)
192
now = datetime.datetime.now()
193
if os.WIFEXITED(condition) \
194
and (os.WEXITSTATUS(condition) == 0):
195
logger.debug(u"Checker for %(name)s succeeded",
198
gobject.source_remove(self.stop_initiator_tag)
199
self.stop_initiator_tag = gobject.timeout_add\
200
(self._timeout_milliseconds,
324
202
elif not os.WIFEXITED(condition):
325
203
logger.warning(u"Checker for %(name)s crashed?",
328
self.CheckerCompleted(False)
330
logger.info(u"Checker for %(name)s failed",
333
self.CheckerCompleted(False)
335
def bump_timeout(self):
336
"""Bump up the timeout for this client.
337
This should only be called when the client has been seen,
340
self.last_checked_ok = datetime.datetime.utcnow()
341
gobject.source_remove(self.stop_initiator_tag)
342
self.stop_initiator_tag = (gobject.timeout_add
343
(self._timeout_milliseconds,
206
logger.debug(u"Checker for %(name)s failed",
209
self.checker_callback_tag = None
346
210
def start_checker(self):
347
211
"""Start a new checker subprocess if one is not running.
348
212
If a checker already exists, leave it running and do
350
# The reason for not killing a running checker is that if we
351
# did that, then if a checker (for some reason) started
352
# running slowly and taking more than 'interval' time, the
353
# client would inevitably timeout, since no checker would get
354
# a chance to run to completion. If we instead leave running
355
# checkers alone, the checker would have to take more time
356
# than 'timeout' for the client to be declared invalid, which
357
# is as it should be.
358
214
if self.checker is None:
360
# In case check_command has exactly one % operator
361
command = self.check_command % self.host
216
command = self.check_command % self.fqdn
362
217
except TypeError:
363
# Escape attributes for the shell
364
218
escaped_attrs = dict((key, re.escape(str(val)))
366
220
vars(self).iteritems())
368
222
command = self.check_command % escaped_attrs
369
223
except TypeError, error:
370
logger.error(u'Could not format string "%s":'
371
u' %s', self.check_command, error)
224
logger.critical(u'Could not format string "%s":'
225
u' %s', self.check_command, error)
372
226
return True # Try again later
374
logger.info(u"Starting checker %r for %s",
376
# We don't need to redirect stdout and stderr, since
377
# in normal mode, that is already done by daemon(),
378
# and in debug mode we don't want to. (Stdin is
379
# always replaced by /dev/null.)
380
self.checker = subprocess.Popen(command,
383
self.checker_callback_tag = (gobject.child_watch_add
385
self.checker_callback))
387
self.CheckerStarted(command)
388
except OSError, error:
228
logger.debug(u"Starting checker %r for %s",
230
self.checker = subprocess.\
232
close_fds=True, shell=True,
234
self.checker_callback_tag = gobject.child_watch_add\
236
self.checker_callback)
237
except subprocess.OSError, error:
389
238
logger.error(u"Failed to start subprocess: %s",
391
240
# Re-run this periodically if run by gobject.timeout_add
394
242
def stop_checker(self):
395
243
"""Force the checker process, if any, to stop."""
396
if self.checker_callback_tag:
397
gobject.source_remove(self.checker_callback_tag)
398
self.checker_callback_tag = None
399
if getattr(self, "checker", None) is None:
244
if not hasattr(self, "checker") or self.checker is None:
401
logger.debug(u"Stopping checker for %(name)s", vars(self))
403
os.kill(self.checker.pid, signal.SIGTERM)
405
#if self.checker.poll() is None:
406
# os.kill(self.checker.pid, signal.SIGKILL)
407
except OSError, error:
408
if error.errno != errno.ESRCH: # No such process
246
gobject.source_remove(self.checker_callback_tag)
247
self.checker_callback_tag = None
248
os.kill(self.checker.pid, signal.SIGTERM)
249
if self.checker.poll() is None:
250
os.kill(self.checker.pid, signal.SIGKILL)
410
251
self.checker = None
412
def still_valid(self):
252
def still_valid(self, now=None):
413
253
"""Has the timeout not yet passed for this client?"""
416
now = datetime.datetime.utcnow()
417
if self.last_checked_ok is None:
255
now = datetime.datetime.now()
256
if self.last_seen is None:
418
257
return now < (self.created + self.timeout)
420
return now < (self.last_checked_ok + self.timeout)
422
## D-Bus methods & signals
423
_interface = u"org.mandos_system.Mandos.Client"
425
def _datetime_to_dbus_struct(dt):
426
return dbus.Struct(dt.year, dt.month, dt.day, dt.hour,
427
dt.minute, dt.second, dt.microsecond,
430
# BumpTimeout - method
431
BumpTimeout = dbus.service.method(_interface)(bump_timeout)
432
BumpTimeout.__name__ = "BumpTimeout"
434
# IntervalChanged - signal
435
@dbus.service.signal(_interface, signature="t")
436
def IntervalChanged(self, t):
440
# CheckerCompleted - signal
441
@dbus.service.signal(_interface, signature="b")
442
def CheckerCompleted(self, success):
446
# CheckerIsRunning - method
447
@dbus.service.method(_interface, out_signature="b")
448
def CheckerIsRunning(self):
449
"D-Bus getter method"
450
return self.checker is not None
452
# CheckerStarted - signal
453
@dbus.service.signal(_interface, signature="s")
454
def CheckerStarted(self, command):
458
# GetChecker - method
459
@dbus.service.method(_interface, out_signature="s")
460
def GetChecker(self):
461
"D-Bus getter method"
462
return self.checker_command
464
# GetCreated - method
465
@dbus.service.method(_interface, out_signature="(nyyyyyu)")
466
def GetCreated(self):
467
"D-Bus getter method"
468
return datetime_to_dbus_struct(self.created)
470
# GetFingerprint - method
471
@dbus.service.method(_interface, out_signature="s")
472
def GetFingerprint(self):
473
"D-Bus getter method"
474
return self.fingerprint
477
@dbus.service.method(_interface, out_signature="s")
479
"D-Bus getter method"
482
# GetInterval - method
483
@dbus.service.method(_interface, out_signature="t")
484
def GetInterval(self):
485
"D-Bus getter method"
486
return self._interval_milliseconds
489
@dbus.service.method(_interface, out_signature="s")
491
"D-Bus getter method"
494
# GetStarted - method
495
@dbus.service.method(_interface, out_signature="(nyyyyyu)")
496
def GetStarted(self):
497
"D-Bus getter method"
498
if self.started is not None:
499
return datetime_to_dbus_struct(self.started)
501
return dbus.Struct(0, 0, 0, 0, 0, 0, 0,
504
# GetTimeout - method
505
@dbus.service.method(_interface, out_signature="t")
506
def GetTimeout(self):
507
"D-Bus getter method"
508
return self._timeout_milliseconds
510
# SetChecker - method
511
@dbus.service.method(_interface, in_signature="s")
512
def SetChecker(self, checker):
513
"D-Bus setter method"
514
self.checker_command = checker
517
@dbus.service.method(_interface, in_signature="s")
518
def SetHost(self, host):
519
"D-Bus setter method"
522
# SetInterval - method
523
@dbus.service.method(_interface, in_signature="t")
524
def SetInterval(self, milliseconds):
525
self.interval = datetime.timdeelta(0, 0, 0, milliseconds)
527
# SetTimeout - method
528
@dbus.service.method(_interface, in_signature="t")
529
def SetTimeout(self, milliseconds):
530
self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
533
@dbus.service.method(_interface, in_signature="ay",
535
def SetSecret(self, secret):
536
"D-Bus setter method"
537
self.secret = str(secret)
540
Start = dbus.service.method(_interface)(start)
541
Start.__name__ = "Start"
543
# StartChecker - method
544
StartChecker = dbus.service.method(_interface)(start_checker)
545
StartChecker.__name__ = "StartChecker"
547
# StateChanged - signal
548
@dbus.service.signal(_interface, signature="b")
549
def StateChanged(self, started):
553
# StillValid - method
554
StillValid = (dbus.service.method(_interface, out_signature="b")
556
StillValid.__name__ = "StillValid"
559
Stop = dbus.service.method(_interface)(stop)
560
Stop.__name__ = "Stop"
562
# StopChecker - method
563
StopChecker = dbus.service.method(_interface)(stop_checker)
564
StopChecker.__name__ = "StopChecker"
566
# TimeoutChanged - signal
567
@dbus.service.signal(_interface, signature="t")
568
def TimeoutChanged(self, t):
572
del _datetime_to_dbus_struct
259
return now < (self.last_seen + self.timeout)
576
262
def peer_certificate(session):
577
"Return the peer's OpenPGP certificate as a bytestring"
263
"Return an OpenPGP data packet string for the peer's certificate"
578
264
# If not an OpenPGP certificate...
579
if (gnutls.library.functions
580
.gnutls_certificate_type_get(session._c_object)
581
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
265
if gnutls.library.functions.gnutls_certificate_type_get\
266
(session._c_object) \
267
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
582
268
# ...do the normal thing
583
269
return session.peer_certificate
584
270
list_size = ctypes.c_uint()
585
cert_list = (gnutls.library.functions
586
.gnutls_certificate_get_peers
587
(session._c_object, ctypes.byref(list_size)))
271
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
272
(session._c_object, ctypes.byref(list_size))
588
273
if list_size.value == 0:
590
275
cert = cert_list[0]
594
279
def fingerprint(openpgp):
595
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
596
# New GnuTLS "datum" with the OpenPGP public key
597
datum = (gnutls.library.types
598
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
601
ctypes.c_uint(len(openpgp))))
280
"Convert an OpenPGP data string to a hexdigit fingerprint string"
602
281
# New empty GnuTLS certificate
603
282
crt = gnutls.library.types.gnutls_openpgp_crt_t()
604
(gnutls.library.functions
605
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
283
gnutls.library.functions.gnutls_openpgp_crt_init\
285
# New GnuTLS "datum" with the OpenPGP public key
286
datum = gnutls.library.types.gnutls_datum_t\
287
(ctypes.cast(ctypes.c_char_p(openpgp),
288
ctypes.POINTER(ctypes.c_ubyte)),
289
ctypes.c_uint(len(openpgp)))
606
290
# Import the OpenPGP public key into the certificate
607
(gnutls.library.functions
608
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
609
gnutls.library.constants
610
.GNUTLS_OPENPGP_FMT_RAW))
611
# Verify the self signature in the key
612
crtverify = ctypes.c_uint()
613
(gnutls.library.functions
614
.gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
615
if crtverify.value != 0:
616
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
617
raise gnutls.errors.CertificateSecurityError("Verify failed")
291
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
294
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
618
295
# New buffer for the fingerprint
619
buf = ctypes.create_string_buffer(20)
620
buf_len = ctypes.c_size_t()
296
buffer = ctypes.create_string_buffer(20)
297
buffer_length = ctypes.c_size_t()
621
298
# Get the fingerprint from the certificate into the buffer
622
(gnutls.library.functions
623
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
624
ctypes.byref(buf_len)))
299
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
300
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
625
301
# Deinit the certificate
626
302
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
627
303
# Convert the buffer to a Python bytestring
628
fpr = ctypes.string_at(buf, buf_len.value)
304
fpr = ctypes.string_at(buffer, buffer_length.value)
629
305
# Convert the bytestring to hexadecimal notation
630
306
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
634
class TCP_handler(SocketServer.BaseRequestHandler, object):
310
class tcp_handler(SocketServer.BaseRequestHandler, object):
635
311
"""A TCP request handler class.
636
312
Instantiated by IPv6_TCPServer for each request to handle it.
637
313
Note: This will run in its own forked process."""
639
315
def handle(self):
640
logger.info(u"TCP connection from: %s",
641
unicode(self.client_address))
642
session = (gnutls.connection
643
.ClientSession(self.request,
647
line = self.request.makefile().readline()
648
logger.debug(u"Protocol version: %r", line)
650
if int(line.strip().split()[0]) > 1:
652
except (ValueError, IndexError, RuntimeError), error:
653
logger.error(u"Unknown protocol version: %s", error)
656
# Note: gnutls.connection.X509Credentials is really a generic
657
# GnuTLS certificate credentials object so long as no X.509
658
# keys are added to it. Therefore, we can use it here despite
659
# using OpenPGP certificates.
316
logger.debug(u"TCP connection from: %s",
317
unicode(self.client_address))
318
session = gnutls.connection.ClientSession(self.request,
661
322
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
662
323
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
664
# Use a fallback default, since this MUST be set.
665
priority = self.server.settings.get("priority", "NORMAL")
666
(gnutls.library.functions
667
.gnutls_priority_set_direct(session._c_object,
325
priority = "SECURE256"
327
gnutls.library.functions.gnutls_priority_set_direct\
328
(session._c_object, priority, None);
671
331
session.handshake()
672
332
except gnutls.errors.GNUTLSError, error:
673
logger.warning(u"Handshake failed: %s", error)
333
logger.debug(u"Handshake failed: %s", error)
674
334
# Do not run session.bye() here: the session is not
675
335
# established. Just abandon the request.
678
338
fpr = fingerprint(peer_certificate(session))
679
339
except (TypeError, gnutls.errors.GNUTLSError), error:
680
logger.warning(u"Bad certificate: %s", error)
340
logger.debug(u"Bad certificate: %s", error)
683
343
logger.debug(u"Fingerprint: %s", fpr)
684
for c in self.server.clients:
685
346
if c.fingerprint == fpr:
689
logger.warning(u"Client not found for fingerprint: %s",
693
349
# Have to check if client.still_valid(), since it is possible
694
350
# that the client timed out while establishing the GnuTLS
696
if not client.still_valid():
697
logger.warning(u"Client %(name)s is invalid",
352
if (not client) or (not client.still_valid()):
354
logger.debug(u"Client %(name)s is invalid",
357
logger.debug(u"Client not found for fingerprint: %s",
701
## This won't work here, since we're in a fork.
702
# client.bump_timeout()
704
362
while sent_size < len(client.secret):
705
363
sent = session.send(client.secret[sent_size:])
783
427
datetime.timedelta(1)
784
428
>>> string_to_delta(u'1w')
785
429
datetime.timedelta(7)
786
>>> string_to_delta('5m 30s')
787
datetime.timedelta(0, 330)
789
timevalue = datetime.timedelta(0)
790
for s in interval.split():
792
suffix = unicode(s[-1])
795
delta = datetime.timedelta(value)
797
delta = datetime.timedelta(0, value)
799
delta = datetime.timedelta(0, 0, 0, 0, value)
801
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
803
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
806
except (ValueError, IndexError):
432
suffix=unicode(interval[-1])
433
value=int(interval[:-1])
435
delta = datetime.timedelta(value)
437
delta = datetime.timedelta(0, value)
439
delta = datetime.timedelta(0, 0, 0, 0, value)
441
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
443
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
446
except (ValueError, IndexError):
452
"""From the Avahi server example code"""
453
global group, serviceName, serviceType, servicePort, serviceTXT, \
456
group = dbus.Interface(
457
bus.get_object( avahi.DBUS_NAME,
458
server.EntryGroupNew()),
459
avahi.DBUS_INTERFACE_ENTRY_GROUP)
460
group.connect_to_signal('StateChanged',
461
entry_group_state_changed)
462
logger.debug(u"Adding service '%s' of type '%s' ...",
463
serviceName, serviceType)
466
serviceInterface, # interface
467
avahi.PROTO_INET6, # protocol
468
dbus.UInt32(0), # flags
469
serviceName, serviceType,
471
dbus.UInt16(servicePort),
472
avahi.string_array_to_txt_array(serviceTXT))
476
def remove_service():
477
"""From the Avahi server example code"""
480
if not group is None:
812
484
def server_state_changed(state):
813
"""Derived from the Avahi example code"""
485
"""From the Avahi server example code"""
814
486
if state == avahi.SERVER_COLLISION:
815
logger.error(u"Zeroconf server name collision")
487
logger.warning(u"Server name collision")
817
489
elif state == avahi.SERVER_RUNNING:
821
493
def entry_group_state_changed(state, error):
822
"""Derived from the Avahi example code"""
823
logger.debug(u"Avahi state change: %i", state)
494
"""From the Avahi server example code"""
495
global serviceName, server, rename_count
497
logger.debug(u"state change: %i", state)
825
499
if state == avahi.ENTRY_GROUP_ESTABLISHED:
826
logger.debug(u"Zeroconf service established.")
500
logger.debug(u"Service established.")
827
501
elif state == avahi.ENTRY_GROUP_COLLISION:
828
logger.warning(u"Zeroconf service name collision.")
503
rename_count = rename_count - 1
505
name = server.GetAlternativeServiceName(name)
506
logger.warning(u"Service name collision, "
507
u"changing name to '%s' ...", name)
512
logger.error(u"No suitable service name found after %i"
513
u" retries, exiting.", n_rename)
830
515
elif state == avahi.ENTRY_GROUP_FAILURE:
831
logger.critical(u"Avahi: Error in group state changed %s",
833
raise AvahiGroupError("State changed: %s", str(error))
516
logger.error(u"Error in group state changed %s",
835
521
def if_nametoindex(interface):
836
"""Call the C function if_nametoindex(), or equivalent"""
837
global if_nametoindex
522
"""Call the C function if_nametoindex()"""
839
if_nametoindex = (ctypes.cdll.LoadLibrary
840
(ctypes.util.find_library("c"))
524
libc = ctypes.cdll.LoadLibrary("libc.so.6")
525
return libc.if_nametoindex(interface)
842
526
except (OSError, AttributeError):
843
527
if "struct" not in sys.modules:
845
529
if "fcntl" not in sys.modules:
847
def if_nametoindex(interface):
848
"Get an interface index the hard way, i.e. using fcntl()"
849
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
850
with closing(socket.socket()) as s:
851
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
852
struct.pack("16s16x", interface))
853
interface_index = struct.unpack("I", ifreq[16:20])[0]
854
return interface_index
855
return if_nametoindex(interface)
858
def daemon(nochdir = False, noclose = False):
531
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
533
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
534
struct.pack("16s16x", interface))
536
interface_index = struct.unpack("I", ifreq[16:20])[0]
537
return interface_index
540
def daemon(nochdir, noclose):
859
541
"""See daemon(3). Standard BSD Unix function.
860
542
This should really exist as os.daemon, but it doesn't (yet)."""
882
parser = OptionParser(version = "%%prog %s" % version)
561
def killme(status = 0):
562
logger.debug("Stopping server with exit status %d", status)
564
if main_loop_started:
570
if __name__ == '__main__':
572
main_loop_started = False
573
parser = OptionParser()
883
574
parser.add_option("-i", "--interface", type="string",
884
metavar="IF", help="Bind to interface IF")
885
parser.add_option("-a", "--address", type="string",
886
help="Address to listen for requests on")
887
parser.add_option("-p", "--port", type="int",
575
default=None, metavar="IF",
576
help="Bind to interface IF")
577
parser.add_option("-p", "--port", type="int", default=None,
888
578
help="Port number to receive requests on")
579
parser.add_option("--timeout", type="string", # Parsed later
581
help="Amount of downtime allowed for clients")
582
parser.add_option("--interval", type="string", # Parsed later
584
help="How often to check that a client is up")
889
585
parser.add_option("--check", action="store_true", default=False,
890
586
help="Run self-test")
891
parser.add_option("--debug", action="store_true",
892
help="Debug mode; run in foreground and log to"
894
parser.add_option("--priority", type="string", help="GnuTLS"
895
" priority string (see GnuTLS documentation)")
896
parser.add_option("--servicename", type="string", metavar="NAME",
897
help="Zeroconf service name")
898
parser.add_option("--configdir", type="string",
899
default="/etc/mandos", metavar="DIR",
900
help="Directory to search for configuration"
902
options = parser.parse_args()[0]
587
parser.add_option("--debug", action="store_true", default=False,
589
(options, args) = parser.parse_args()
904
591
if options.check:
906
593
doctest.testmod()
909
# Default values for config file for server-global settings
910
server_defaults = { "interface": "",
915
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
916
"servicename": "Mandos",
919
# Parse config file for server-global settings
920
server_config = ConfigParser.SafeConfigParser(server_defaults)
922
server_config.read(os.path.join(options.configdir, "mandos.conf"))
923
# Convert the SafeConfigParser object to a dict
924
server_settings = server_config.defaults()
925
# Use getboolean on the boolean config option
926
server_settings["debug"] = (server_config.getboolean
927
("DEFAULT", "debug"))
930
# Override the settings from the config file with command line
932
for option in ("interface", "address", "port", "debug",
933
"priority", "servicename", "configdir"):
934
value = getattr(options, option)
935
if value is not None:
936
server_settings[option] = value
938
# Now we have our good server settings in "server_settings"
940
debug = server_settings["debug"]
943
syslogger.setLevel(logging.WARNING)
944
console.setLevel(logging.WARNING)
946
if server_settings["servicename"] != "Mandos":
947
syslogger.setFormatter(logging.Formatter
948
('Mandos (%s): %%(levelname)s:'
950
% server_settings["servicename"]))
952
# Parse config file with clients
953
client_defaults = { "timeout": "1h",
955
"checker": "fping -q -- %(host)s",
958
client_config = ConfigParser.SafeConfigParser(client_defaults)
959
client_config.read(os.path.join(server_settings["configdir"],
963
tcp_server = IPv6_TCPServer((server_settings["address"],
964
server_settings["port"]),
966
settings=server_settings,
968
pidfilename = "/var/run/mandos.pid"
970
pidfile = open(pidfilename, "w")
971
except IOError, error:
972
logger.error("Could not open file %r", pidfilename)
977
uid = pwd.getpwnam("mandos").pw_uid
980
uid = pwd.getpwnam("nobody").pw_uid
984
gid = pwd.getpwnam("mandos").pw_gid
987
gid = pwd.getpwnam("nogroup").pw_gid
993
except OSError, error:
994
if error[0] != errno.EPERM:
998
service = AvahiService(name = server_settings["servicename"],
999
servicetype = "_mandos._tcp", )
1000
if server_settings["interface"]:
1001
service.interface = (if_nametoindex
1002
(server_settings["interface"]))
1007
# From the Avahi example code
596
# Parse the time arguments
598
options.timeout = string_to_delta(options.timeout)
600
parser.error("option --timeout: Unparseable time")
602
options.interval = string_to_delta(options.interval)
604
parser.error("option --interval: Unparseable time")
607
defaults = { "checker": "fping -q -- %%(fqdn)s" }
608
client_config = ConfigParser.SafeConfigParser(defaults)
609
#client_config.readfp(open("secrets.conf"), "secrets.conf")
610
client_config.read("mandos-clients.conf")
612
# From the Avahi server example code
1008
613
DBusGMainLoop(set_as_default=True )
1009
614
main_loop = gobject.MainLoop()
1010
615
bus = dbus.SystemBus()
1011
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1012
avahi.DBUS_PATH_SERVER),
1013
avahi.DBUS_INTERFACE_SERVER)
616
server = dbus.Interface(
617
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
618
avahi.DBUS_INTERFACE_SERVER )
1014
619
# End of Avahi example code
1015
bus_name = dbus.service.BusName(u"org.mandos-system.Mandos", bus)
621
debug = options.debug
624
console = logging.StreamHandler()
625
# console.setLevel(logging.DEBUG)
626
console.setFormatter(logging.Formatter\
627
('%(levelname)s: %(message)s'))
628
logger.addHandler(console)
1017
632
def remove_from_clients(client):
1018
633
clients.remove(client)
1020
logger.critical(u"No clients left, exiting")
635
logger.debug(u"No clients left, exiting")
1023
clients.update(Set(Client(name = section,
638
clients.update(Set(Client(name=section, options=options,
1024
639
stop_hook = remove_from_clients,
1026
= dict(client_config.items(section)))
640
**(dict(client_config\
1027
642
for section in client_config.sections()))
1029
logger.critical(u"No clients defined")
1033
# Redirect stdin so all checkers get /dev/null
1034
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1035
os.dup2(null, sys.stdin.fileno())
1039
# No console logging
1040
logger.removeHandler(console)
1041
# Close all input and output, do double fork, etc.
1046
pidfile.write(str(pid) + "\n")
1050
logger.error(u"Could not write to file %r with PID %d",
1053
# "pidfile" was never created
1058
648
"Cleanup function; run on exit"
1060
# From the Avahi example code
650
# From the Avahi server example code
1061
651
if not group is None:
1064
654
# End of Avahi example code
1067
client = clients.pop()
656
for client in clients:
1068
657
client.stop_hook = None