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- Committer: Teddy Hogeborn
- Date: 2008-01-30 17:28:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080130172818-fnrq2xmtg1wa8wo2
* client.cpp (main): Get t_old early since it is used on error exits.
* server.py (Client.checker): New attribute.
(Client.check_action, Client.start_checker, Client.stop_checker,
Client.fileno, Client.next_stop, Client.still_valid,
Client.it_is_time_to_check): New methods.
(Client.handle_request): Alias to "check_action".
(main): Stop all started checkers on exit. Exit cleanly on keyboard
interrupt.
* server.py (Client.checker): New attribute.
(Client.check_action, Client.start_checker, Client.stop_checker,
Client.fileno, Client.next_stop, Client.still_valid,
Client.it_is_time_to_check): New methods.
(Client.handle_request): Alias to "check_action".
(main): Stop all started checkers on exit. Exit cleanly on keyboard
interrupt.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- plugins.d
- files renamed:
- clients.conf => mandos-clients.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
1
1
#!/usr/bin/python
2
# -*- mode: python; coding: utf-8 -*-
3
#
4
# Mandos server - give out binary blobs to connecting clients.
5
#
6
# This program is partly derived from an example program for an Avahi
7
# service publisher, downloaded from
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add", "remove", "server_state_changed",
10
# "entry_group_state_changed", "cleanup", and "activate" in the
11
# "AvahiService" class, and some lines in "main".
12
#
13
# Everything else is
14
# Copyright © 2008,2009 Teddy Hogeborn
15
# Copyright © 2008,2009 Björn Påhlsson
16
#
17
# This program is free software: you can redistribute it and/or modify
18
# it under the terms of the GNU General Public License as published by
19
# the Free Software Foundation, either version 3 of the License, or
20
# (at your option) any later version.
21
#
22
# This program is distributed in the hope that it will be useful,
23
# but WITHOUT ANY WARRANTY; without even the implied warranty of
24
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25
# GNU General Public License for more details.
26
#
27
# You should have received a copy of the GNU General Public License
28
# along with this program. If not, see
29
# <http://www.gnu.org/licenses/>.
30
#
31
# Contact the authors at <mandos@fukt.bsnet.se>.
32
#
33
34
from __future__ import division, with_statement, absolute_import
35
36
import SocketServer as socketserver
2
3
import SocketServer
37
4
import socket
38
import optparse
5
import select
6
from optparse import OptionParser
39
7
import datetime
40
8
import errno
41
9
import gnutls.crypto
42
10
import gnutls.connection
43
11
import gnutls.errors
44
import gnutls.library.functions
45
import gnutls.library.constants
46
import gnutls.library.types
47
import ConfigParser as configparser
12
import ConfigParser
48
13
import sys
49
14
import re
50
15
import os
51
16
import signal
52
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
57
import pwd
58
from contextlib import closing
59
import struct
60
import fcntl
61
import functools
62
63
import dbus
64
import dbus.service
65
import gobject
66
import avahi
67
from dbus.mainloop.glib import DBusGMainLoop
68
import ctypes
69
import ctypes.util
70
import xml.dom.minidom
71
import inspect
72
73
try:
74
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
75
except AttributeError:
76
try:
77
from IN import SO_BINDTODEVICE
78
except ImportError:
79
SO_BINDTODEVICE = None
80
81
82
version = "1.0.12"
83
84
logger = logging.Logger(u'mandos')
85
syslogger = (logging.handlers.SysLogHandler
86
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
87
address = "/dev/log"))
88
syslogger.setFormatter(logging.Formatter
89
(u'Mandos [%(process)d]: %(levelname)s:'
90
u' %(message)s'))
91
logger.addHandler(syslogger)
92
93
console = logging.StreamHandler()
94
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
95
u' %(levelname)s:'
96
u' %(message)s'))
97
logger.addHandler(console)
98
99
class AvahiError(Exception):
100
def __init__(self, value, *args, **kwargs):
101
self.value = value
102
super(AvahiError, self).__init__(value, *args, **kwargs)
103
def __unicode__(self):
104
return unicode(repr(self.value))
105
106
class AvahiServiceError(AvahiError):
107
pass
108
109
class AvahiGroupError(AvahiError):
110
pass
111
112
113
class AvahiService(object):
114
"""An Avahi (Zeroconf) service.
115
116
Attributes:
117
interface: integer; avahi.IF_UNSPEC or an interface index.
118
Used to optionally bind to the specified interface.
119
name: string; Example: u'Mandos'
120
type: string; Example: u'_mandos._tcp'.
121
See <http://www.dns-sd.org/ServiceTypes.html>
122
port: integer; what port to announce
123
TXT: list of strings; TXT record for the service
124
domain: string; Domain to publish on, default to .local if empty.
125
host: string; Host to publish records for, default is localhost
126
max_renames: integer; maximum number of renames
127
rename_count: integer; counter so we only rename after collisions
128
a sensible number of times
129
group: D-Bus Entry Group
130
server: D-Bus Server
131
bus: dbus.SystemBus()
132
"""
133
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
134
servicetype = None, port = None, TXT = None,
135
domain = u"", host = u"", max_renames = 32768,
136
protocol = avahi.PROTO_UNSPEC, bus = None):
137
self.interface = interface
138
self.name = name
139
self.type = servicetype
140
self.port = port
141
self.TXT = TXT if TXT is not None else []
142
self.domain = domain
143
self.host = host
144
self.rename_count = 0
145
self.max_renames = max_renames
146
self.protocol = protocol
147
self.group = None # our entry group
148
self.server = None
149
self.bus = bus
150
def rename(self):
151
"""Derived from the Avahi example code"""
152
if self.rename_count >= self.max_renames:
153
logger.critical(u"No suitable Zeroconf service name found"
154
u" after %i retries, exiting.",
155
self.rename_count)
156
raise AvahiServiceError(u"Too many renames")
157
self.name = self.server.GetAlternativeServiceName(self.name)
158
logger.info(u"Changing Zeroconf service name to %r ...",
159
unicode(self.name))
160
syslogger.setFormatter(logging.Formatter
161
(u'Mandos (%s) [%%(process)d]:'
162
u' %%(levelname)s: %%(message)s'
163
% self.name))
164
self.remove()
165
self.add()
166
self.rename_count += 1
167
def remove(self):
168
"""Derived from the Avahi example code"""
169
if self.group is not None:
170
self.group.Reset()
171
def add(self):
172
"""Derived from the Avahi example code"""
173
if self.group is None:
174
self.group = dbus.Interface(
175
self.bus.get_object(avahi.DBUS_NAME,
176
self.server.EntryGroupNew()),
177
avahi.DBUS_INTERFACE_ENTRY_GROUP)
178
self.group.connect_to_signal('StateChanged',
179
self
180
.entry_group_state_changed)
181
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
182
self.name, self.type)
183
self.group.AddService(
184
self.interface,
185
self.protocol,
186
dbus.UInt32(0), # flags
187
self.name, self.type,
188
self.domain, self.host,
189
dbus.UInt16(self.port),
190
avahi.string_array_to_txt_array(self.TXT))
191
self.group.Commit()
192
def entry_group_state_changed(self, state, error):
193
"""Derived from the Avahi example code"""
194
logger.debug(u"Avahi state change: %i", state)
195
196
if state == avahi.ENTRY_GROUP_ESTABLISHED:
197
logger.debug(u"Zeroconf service established.")
198
elif state == avahi.ENTRY_GROUP_COLLISION:
199
logger.warning(u"Zeroconf service name collision.")
200
self.rename()
201
elif state == avahi.ENTRY_GROUP_FAILURE:
202
logger.critical(u"Avahi: Error in group state changed %s",
203
unicode(error))
204
raise AvahiGroupError(u"State changed: %s"
205
% unicode(error))
206
def cleanup(self):
207
"""Derived from the Avahi example code"""
208
if self.group is not None:
209
self.group.Free()
210
self.group = None
211
def server_state_changed(self, state):
212
"""Derived from the Avahi example code"""
213
if state == avahi.SERVER_COLLISION:
214
logger.error(u"Zeroconf server name collision")
215
self.remove()
216
elif state == avahi.SERVER_RUNNING:
217
self.add()
218
def activate(self):
219
"""Derived from the Avahi example code"""
220
if self.server is None:
221
self.server = dbus.Interface(
222
self.bus.get_object(avahi.DBUS_NAME,
223
avahi.DBUS_PATH_SERVER),
224
avahi.DBUS_INTERFACE_SERVER)
225
self.server.connect_to_signal(u"StateChanged",
226
self.server_state_changed)
227
self.server_state_changed(self.server.GetState())
228
229
17
230
18
class Client(object):
231
"""A representation of a client host served by this server.
232
233
Attributes:
234
name: string; from the config file, used in log messages and
235
D-Bus identifiers
236
fingerprint: string (40 or 32 hexadecimal digits); used to
237
uniquely identify the client
238
secret: bytestring; sent verbatim (over TLS) to client
239
host: string; available for use by the checker command
240
created: datetime.datetime(); (UTC) object creation
241
last_enabled: datetime.datetime(); (UTC)
242
enabled: bool()
243
last_checked_ok: datetime.datetime(); (UTC) or None
244
timeout: datetime.timedelta(); How long from last_checked_ok
245
until this client is invalid
246
interval: datetime.timedelta(); How often to start a new checker
247
disable_hook: If set, called by disable() as disable_hook(self)
248
checker: subprocess.Popen(); a running checker process used
249
to see if the client lives.
250
'None' if no process is running.
251
checker_initiator_tag: a gobject event source tag, or None
252
disable_initiator_tag: - '' -
253
checker_callback_tag: - '' -
254
checker_command: string; External command which is run to check if
255
client lives. %() expansions are done at
256
runtime with vars(self) as dict, so that for
257
instance %(name)s can be used in the command.
258
current_checker_command: string; current running checker_command
259
"""
260
261
@staticmethod
262
def _timedelta_to_milliseconds(td):
263
"Convert a datetime.timedelta() to milliseconds"
264
return ((td.days * 24 * 60 * 60 * 1000)
265
+ (td.seconds * 1000)
266
+ (td.microseconds // 1000))
267
268
def timeout_milliseconds(self):
269
"Return the 'timeout' attribute in milliseconds"
270
return self._timedelta_to_milliseconds(self.timeout)
271
272
def interval_milliseconds(self):
273
"Return the 'interval' attribute in milliseconds"
274
return self._timedelta_to_milliseconds(self.interval)
275
276
def __init__(self, name = None, disable_hook=None, config=None):
277
"""Note: the 'checker' key in 'config' sets the
278
'checker_command' attribute and *not* the 'checker'
279
attribute."""
19
def __init__(self, name=None, options=None, dn=None,
20
password=None, passfile=None, fqdn=None,
21
timeout=None, interval=-1):
280
22
self.name = name
281
if config is None:
282
config = {}
283
logger.debug(u"Creating client %r", self.name)
284
# Uppercase and remove spaces from fingerprint for later
285
# comparison purposes with return value from the fingerprint()
286
# function
287
self.fingerprint = (config[u"fingerprint"].upper()
288
.replace(u" ", u""))
289
logger.debug(u" Fingerprint: %s", self.fingerprint)
290
if u"secret" in config:
291
self.secret = config[u"secret"].decode(u"base64")
292
elif u"secfile" in config:
293
with closing(open(os.path.expanduser
294
(os.path.expandvars
295
(config[u"secfile"])),
296
"rb")) as secfile:
297
self.secret = secfile.read()
23
self.dn = dn
24
if password:
25
self.password = password
26
elif passfile:
27
self.password = open(passfile).readall()
298
28
else:
299
raise TypeError(u"No secret or secfile for client %s"
300
% self.name)
301
self.host = config.get(u"host", u"")
302
self.created = datetime.datetime.utcnow()
303
self.enabled = False
304
self.last_enabled = None
305
self.last_checked_ok = None
306
self.timeout = string_to_delta(config[u"timeout"])
307
self.interval = string_to_delta(config[u"interval"])
308
self.disable_hook = disable_hook
309
self.checker = None
310
self.checker_initiator_tag = None
311
self.disable_initiator_tag = None
312
self.checker_callback_tag = None
313
self.checker_command = config[u"checker"]
314
self.current_checker_command = None
315
self.last_connect = None
316
317
def enable(self):
318
"""Start this client's checker and timeout hooks"""
319
if getattr(self, u"enabled", False):
320
# Already enabled
29
print "No Password or Passfile in client config file"
30
# raise RuntimeError XXX
31
self.password = "gazonk"
32
self.fqdn = fqdn # string
33
self.created = datetime.datetime.now()
34
self.last_seen = None # datetime.datetime()
35
if timeout is None:
36
timeout = options.timeout
37
self.timeout = timeout # datetime.timedelta()
38
if interval == -1:
39
interval = options.interval
40
self.interval = interval # datetime.timedelta()
41
self.next_check = datetime.datetime.now() # datetime.datetime()
42
self.checker = None # or a subprocess.Popen()
43
def check_action(self, now=None):
44
"""The checker said something and might have completed.
45
Check if is has, and take appropriate actions."""
46
if self.checker.poll() is None:
47
# False alarm, no result yet
48
#self.checker.read()
321
49
return
322
self.last_enabled = datetime.datetime.utcnow()
323
# Schedule a new checker to be started an 'interval' from now,
324
# and every interval from then on.
325
self.checker_initiator_tag = (gobject.timeout_add
326
(self.interval_milliseconds(),
327
self.start_checker))
328
# Also start a new checker *right now*.
329
self.start_checker()
330
# Schedule a disable() when 'timeout' has passed
331
self.disable_initiator_tag = (gobject.timeout_add
332
(self.timeout_milliseconds(),
333
self.disable))
334
self.enabled = True
335
336
def disable(self):
337
"""Disable this client."""
338
if not getattr(self, "enabled", False):
339
return False
340
logger.info(u"Disabling client %s", self.name)
341
if getattr(self, u"disable_initiator_tag", False):
342
gobject.source_remove(self.disable_initiator_tag)
343
self.disable_initiator_tag = None
344
if getattr(self, u"checker_initiator_tag", False):
345
gobject.source_remove(self.checker_initiator_tag)
346
self.checker_initiator_tag = None
347
self.stop_checker()
348
if self.disable_hook:
349
self.disable_hook(self)
350
self.enabled = False
351
# Do not run this again if called by a gobject.timeout_add
352
return False
353
354
def __del__(self):
355
self.disable_hook = None
356
self.disable()
357
358
def checker_callback(self, pid, condition, command):
359
"""The checker has completed, so take appropriate actions."""
360
self.checker_callback_tag = None
361
self.checker = None
362
if os.WIFEXITED(condition):
363
exitstatus = os.WEXITSTATUS(condition)
364
if exitstatus == 0:
365
logger.info(u"Checker for %(name)s succeeded",
366
vars(self))
367
self.checked_ok()
368
else:
369
logger.info(u"Checker for %(name)s failed",
370
vars(self))
371
else:
372
logger.warning(u"Checker for %(name)s crashed?",
373
vars(self))
374
375
def checked_ok(self):
376
"""Bump up the timeout for this client.
377
378
This should only be called when the client has been seen,
379
alive and well.
380
"""
381
self.last_checked_ok = datetime.datetime.utcnow()
382
gobject.source_remove(self.disable_initiator_tag)
383
self.disable_initiator_tag = (gobject.timeout_add
384
(self.timeout_milliseconds(),
385
self.disable))
386
50
if now is None:
51
now = datetime.datetime.now()
52
if self.checker.returncode == 0:
53
self.last_seen = now
54
while self.next_check <= now:
55
self.next_check += self.interval
56
handle_request = check_action
387
57
def start_checker(self):
388
"""Start a new checker subprocess if one is not running.
389
390
If a checker already exists, leave it running and do
391
nothing."""
392
# The reason for not killing a running checker is that if we
393
# did that, then if a checker (for some reason) started
394
# running slowly and taking more than 'interval' time, the
395
# client would inevitably timeout, since no checker would get
396
# a chance to run to completion. If we instead leave running
397
# checkers alone, the checker would have to take more time
398
# than 'timeout' for the client to be declared invalid, which
399
# is as it should be.
400
401
# If a checker exists, make sure it is not a zombie
58
self.stop_checker()
402
59
try:
403
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
404
except (AttributeError, OSError), error:
405
if (isinstance(error, OSError)
406
and error.errno != errno.ECHILD):
407
raise error
408
else:
409
if pid:
410
logger.warning(u"Checker was a zombie")
411
gobject.source_remove(self.checker_callback_tag)
412
self.checker_callback(pid, status,
413
self.current_checker_command)
414
# Start a new checker if needed
415
if self.checker is None:
416
try:
417
# In case checker_command has exactly one % operator
418
command = self.checker_command % self.host
419
except TypeError:
420
# Escape attributes for the shell
421
escaped_attrs = dict((key,
422
re.escape(unicode(str(val),
423
errors=
424
u'replace')))
425
for key, val in
426
vars(self).iteritems())
427
try:
428
command = self.checker_command % escaped_attrs
429
except TypeError, error:
430
logger.error(u'Could not format string "%s":'
431
u' %s', self.checker_command, error)
432
return True # Try again later
433
self.current_checker_command = command
434
try:
435
logger.info(u"Starting checker %r for %s",
436
command, self.name)
437
# We don't need to redirect stdout and stderr, since
438
# in normal mode, that is already done by daemon(),
439
# and in debug mode we don't want to. (Stdin is
440
# always replaced by /dev/null.)
441
self.checker = subprocess.Popen(command,
442
close_fds=True,
443
shell=True, cwd=u"/")
444
self.checker_callback_tag = (gobject.child_watch_add
445
(self.checker.pid,
446
self.checker_callback,
447
data=command))
448
# The checker may have completed before the gobject
449
# watch was added. Check for this.
450
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
451
if pid:
452
gobject.source_remove(self.checker_callback_tag)
453
self.checker_callback(pid, status, command)
454
except OSError, error:
455
logger.error(u"Failed to start subprocess: %s",
456
error)
457
# Re-run this periodically if run by gobject.timeout_add
458
return True
459
60
self.checker = subprocess.Popen("sleep 1; fping -q -- %s"
61
% re.escape(self.fqdn),
62
stdout=subprocess.PIPE,
63
close_fds=True,
64
shell=True, cwd="/")
65
except subprocess.OSError, e:
66
print "Failed to start subprocess:", e
460
67
def stop_checker(self):
461
"""Force the checker process, if any, to stop."""
462
if self.checker_callback_tag:
463
gobject.source_remove(self.checker_callback_tag)
464
self.checker_callback_tag = None
465
if getattr(self, u"checker", None) is None:
466
return
467
logger.debug(u"Stopping checker for %(name)s", vars(self))
468
try:
469
os.kill(self.checker.pid, signal.SIGTERM)
470
#os.sleep(0.5)
471
#if self.checker.poll() is None:
472
# os.kill(self.checker.pid, signal.SIGKILL)
473
except OSError, error:
474
if error.errno != errno.ESRCH: # No such process
475
raise
476
self.checker = None
477
478
def still_valid(self):
479
"""Has the timeout not yet passed for this client?"""
480
if not getattr(self, u"enabled", False):
481
return False
482
now = datetime.datetime.utcnow()
483
if self.last_checked_ok is None:
484
return now < (self.created + self.timeout)
485
else:
486
return now < (self.last_checked_ok + self.timeout)
487
488
489
def dbus_service_property(dbus_interface, signature=u"v",
490
access=u"readwrite", byte_arrays=False):
491
"""Decorators for marking methods of a DBusObjectWithProperties to
492
become properties on the D-Bus.
493
494
The decorated method will be called with no arguments by "Get"
495
and with one argument by "Set".
496
497
The parameters, where they are supported, are the same as
498
dbus.service.method, except there is only "signature", since the
499
type from Get() and the type sent to Set() is the same.
500
"""
501
def decorator(func):
502
func._dbus_is_property = True
503
func._dbus_interface = dbus_interface
504
func._dbus_signature = signature
505
func._dbus_access = access
506
func._dbus_name = func.__name__
507
if func._dbus_name.endswith(u"_dbus_property"):
508
func._dbus_name = func._dbus_name[:-14]
509
func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
510
return func
511
return decorator
512
513
514
class DBusPropertyException(dbus.exceptions.DBusException):
515
"""A base class for D-Bus property-related exceptions
516
"""
517
def __unicode__(self):
518
return unicode(str(self))
519
520
521
class DBusPropertyAccessException(DBusPropertyException):
522
"""A property's access permissions disallows an operation.
523
"""
524
pass
525
526
527
class DBusPropertyNotFound(DBusPropertyException):
528
"""An attempt was made to access a non-existing property.
529
"""
530
pass
531
532
533
class DBusObjectWithProperties(dbus.service.Object):
534
"""A D-Bus object with properties.
535
536
Classes inheriting from this can use the dbus_service_property
537
decorator to expose methods as D-Bus properties. It exposes the
538
standard Get(), Set(), and GetAll() methods on the D-Bus.
539
"""
540
541
@staticmethod
542
def _is_dbus_property(obj):
543
return getattr(obj, u"_dbus_is_property", False)
544
545
def _get_all_dbus_properties(self):
546
"""Returns a generator of (name, attribute) pairs
547
"""
548
return ((prop._dbus_name, prop)
549
for name, prop in
550
inspect.getmembers(self, self._is_dbus_property))
551
552
def _get_dbus_property(self, interface_name, property_name):
553
"""Returns a bound method if one exists which is a D-Bus
554
property with the specified name and interface.
555
"""
556
for name in (property_name,
557
property_name + u"_dbus_property"):
558
prop = getattr(self, name, None)
559
if (prop is None
560
or not self._is_dbus_property(prop)
561
or prop._dbus_name != property_name
562
or (interface_name and prop._dbus_interface
563
and interface_name != prop._dbus_interface)):
564
continue
565
return prop
566
# No such property
567
raise DBusPropertyNotFound(self.dbus_object_path + u":"
568
+ interface_name + u"."
569
+ property_name)
570
571
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
572
out_signature=u"v")
573
def Get(self, interface_name, property_name):
574
"""Standard D-Bus property Get() method, see D-Bus standard.
575
"""
576
prop = self._get_dbus_property(interface_name, property_name)
577
if prop._dbus_access == u"write":
578
raise DBusPropertyAccessException(property_name)
579
value = prop()
580
if not hasattr(value, u"variant_level"):
581
return value
582
return type(value)(value, variant_level=value.variant_level+1)
583
584
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
585
def Set(self, interface_name, property_name, value):
586
"""Standard D-Bus property Set() method, see D-Bus standard.
587
"""
588
prop = self._get_dbus_property(interface_name, property_name)
589
if prop._dbus_access == u"read":
590
raise DBusPropertyAccessException(property_name)
591
if prop._dbus_get_args_options[u"byte_arrays"]:
592
value = dbus.ByteArray(''.join(unichr(byte)
593
for byte in value))
594
prop(value)
595
596
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
597
out_signature=u"a{sv}")
598
def GetAll(self, interface_name):
599
"""Standard D-Bus property GetAll() method, see D-Bus
600
standard.
601
602
Note: Will not include properties with access="write".
603
"""
604
all = {}
605
for name, prop in self._get_all_dbus_properties():
606
if (interface_name
607
and interface_name != prop._dbus_interface):
608
# Interface non-empty but did not match
609
continue
610
# Ignore write-only properties
611
if prop._dbus_access == u"write":
612
continue
613
value = prop()
614
if not hasattr(value, u"variant_level"):
615
all[name] = value
616
continue
617
all[name] = type(value)(value, variant_level=
618
value.variant_level+1)
619
return dbus.Dictionary(all, signature=u"sv")
620
621
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
622
out_signature=u"s",
623
path_keyword='object_path',
624
connection_keyword='connection')
625
def Introspect(self, object_path, connection):
626
"""Standard D-Bus method, overloaded to insert property tags.
627
"""
628
xmlstring = dbus.service.Object.Introspect(self, object_path,
629
connection)
630
document = xml.dom.minidom.parseString(xmlstring)
631
del xmlstring
632
def make_tag(document, name, prop):
633
e = document.createElement(u"property")
634
e.setAttribute(u"name", name)
635
e.setAttribute(u"type", prop._dbus_signature)
636
e.setAttribute(u"access", prop._dbus_access)
637
return e
638
for if_tag in document.getElementsByTagName(u"interface"):
639
for tag in (make_tag(document, name, prop)
640
for name, prop
641
in self._get_all_dbus_properties()
642
if prop._dbus_interface
643
== if_tag.getAttribute(u"name")):
644
if_tag.appendChild(tag)
645
xmlstring = document.toxml(u"utf-8")
646
document.unlink()
647
return xmlstring
648
649
650
class ClientDBus(Client, DBusObjectWithProperties):
651
"""A Client class using D-Bus
652
653
Attributes:
654
dbus_object_path: dbus.ObjectPath
655
bus: dbus.SystemBus()
656
"""
657
# dbus.service.Object doesn't use super(), so we can't either.
658
659
def __init__(self, bus = None, *args, **kwargs):
660
self.bus = bus
661
Client.__init__(self, *args, **kwargs)
662
# Only now, when this client is initialized, can it show up on
663
# the D-Bus
664
self.dbus_object_path = (dbus.ObjectPath
665
(u"/clients/"
666
+ self.name.replace(u".", u"_")))
667
DBusObjectWithProperties.__init__(self, self.bus,
668
self.dbus_object_path)
669
670
@staticmethod
671
def _datetime_to_dbus(dt, variant_level=0):
672
"""Convert a UTC datetime.datetime() to a D-Bus type."""
673
return dbus.String(dt.isoformat(),
674
variant_level=variant_level)
675
676
def enable(self):
677
oldstate = getattr(self, u"enabled", False)
678
r = Client.enable(self)
679
if oldstate != self.enabled:
680
# Emit D-Bus signals
681
self.PropertyChanged(dbus.String(u"enabled"),
682
dbus.Boolean(True, variant_level=1))
683
self.PropertyChanged(
684
dbus.String(u"last_enabled"),
685
self._datetime_to_dbus(self.last_enabled,
686
variant_level=1))
687
return r
688
689
def disable(self, signal = True):
690
oldstate = getattr(self, u"enabled", False)
691
r = Client.disable(self)
692
if signal and oldstate != self.enabled:
693
# Emit D-Bus signal
694
self.PropertyChanged(dbus.String(u"enabled"),
695
dbus.Boolean(False, variant_level=1))
696
return r
697
698
def __del__(self, *args, **kwargs):
699
try:
700
self.remove_from_connection()
701
except LookupError:
702
pass
703
if hasattr(DBusObjectWithProperties, u"__del__"):
704
DBusObjectWithProperties.__del__(self, *args, **kwargs)
705
Client.__del__(self, *args, **kwargs)
706
707
def checker_callback(self, pid, condition, command,
708
*args, **kwargs):
709
self.checker_callback_tag = None
710
self.checker = None
711
# Emit D-Bus signal
712
self.PropertyChanged(dbus.String(u"checker_running"),
713
dbus.Boolean(False, variant_level=1))
714
if os.WIFEXITED(condition):
715
exitstatus = os.WEXITSTATUS(condition)
716
# Emit D-Bus signal
717
self.CheckerCompleted(dbus.Int16(exitstatus),
718
dbus.Int64(condition),
719
dbus.String(command))
720
else:
721
# Emit D-Bus signal
722
self.CheckerCompleted(dbus.Int16(-1),
723
dbus.Int64(condition),
724
dbus.String(command))
725
726
return Client.checker_callback(self, pid, condition, command,
727
*args, **kwargs)
728
729
def checked_ok(self, *args, **kwargs):
730
r = Client.checked_ok(self, *args, **kwargs)
731
# Emit D-Bus signal
732
self.PropertyChanged(
733
dbus.String(u"last_checked_ok"),
734
(self._datetime_to_dbus(self.last_checked_ok,
735
variant_level=1)))
736
return r
737
738
def start_checker(self, *args, **kwargs):
739
old_checker = self.checker
740
if self.checker is not None:
741
old_checker_pid = self.checker.pid
742
else:
743
old_checker_pid = None
744
r = Client.start_checker(self, *args, **kwargs)
745
# Only if new checker process was started
746
if (self.checker is not None
747
and old_checker_pid != self.checker.pid):
748
# Emit D-Bus signal
749
self.CheckerStarted(self.current_checker_command)
750
self.PropertyChanged(
751
dbus.String(u"checker_running"),
752
dbus.Boolean(True, variant_level=1))
753
return r
754
755
def stop_checker(self, *args, **kwargs):
756
old_checker = getattr(self, u"checker", None)
757
r = Client.stop_checker(self, *args, **kwargs)
758
if (old_checker is not None
759
and getattr(self, u"checker", None) is None):
760
self.PropertyChanged(dbus.String(u"checker_running"),
761
dbus.Boolean(False, variant_level=1))
762
return r
763
764
## D-Bus methods & signals
765
_interface = u"se.bsnet.fukt.Mandos.Client"
766
767
# CheckedOK - method
768
@dbus.service.method(_interface)
769
def CheckedOK(self):
770
return self.checked_ok()
771
772
# CheckerCompleted - signal
773
@dbus.service.signal(_interface, signature=u"nxs")
774
def CheckerCompleted(self, exitcode, waitstatus, command):
775
"D-Bus signal"
776
pass
777
778
# CheckerStarted - signal
779
@dbus.service.signal(_interface, signature=u"s")
780
def CheckerStarted(self, command):
781
"D-Bus signal"
782
pass
783
784
# PropertyChanged - signal
785
@dbus.service.signal(_interface, signature=u"sv")
786
def PropertyChanged(self, property, value):
787
"D-Bus signal"
788
pass
789
790
# ReceivedSecret - signal
791
@dbus.service.signal(_interface)
792
def ReceivedSecret(self):
793
"D-Bus signal"
794
pass
795
796
# Rejected - signal
797
@dbus.service.signal(_interface)
798
def Rejected(self):
799
"D-Bus signal"
800
pass
801
802
# Enable - method
803
@dbus.service.method(_interface)
804
def Enable(self):
805
"D-Bus method"
806
self.enable()
807
808
# StartChecker - method
809
@dbus.service.method(_interface)
810
def StartChecker(self):
811
"D-Bus method"
812
self.start_checker()
813
814
# Disable - method
815
@dbus.service.method(_interface)
816
def Disable(self):
817
"D-Bus method"
818
self.disable()
819
820
# StopChecker - method
821
@dbus.service.method(_interface)
822
def StopChecker(self):
823
self.stop_checker()
824
825
# name - property
826
@dbus_service_property(_interface, signature=u"s", access=u"read")
827
def name_dbus_property(self):
828
return dbus.String(self.name)
829
830
# fingerprint - property
831
@dbus_service_property(_interface, signature=u"s", access=u"read")
832
def fingerprint_dbus_property(self):
833
return dbus.String(self.fingerprint)
834
835
# host - property
836
@dbus_service_property(_interface, signature=u"s",
837
access=u"readwrite")
838
def host_dbus_property(self, value=None):
839
if value is None: # get
840
return dbus.String(self.host)
841
self.host = value
842
# Emit D-Bus signal
843
self.PropertyChanged(dbus.String(u"host"),
844
dbus.String(value, variant_level=1))
845
846
# created - property
847
@dbus_service_property(_interface, signature=u"s", access=u"read")
848
def created_dbus_property(self):
849
return dbus.String(self._datetime_to_dbus(self.created))
850
851
# last_enabled - property
852
@dbus_service_property(_interface, signature=u"s", access=u"read")
853
def last_enabled_dbus_property(self):
854
if self.last_enabled is None:
855
return dbus.String(u"")
856
return dbus.String(self._datetime_to_dbus(self.last_enabled))
857
858
# enabled - property
859
@dbus_service_property(_interface, signature=u"b",
860
access=u"readwrite")
861
def enabled_dbus_property(self, value=None):
862
if value is None: # get
863
return dbus.Boolean(self.enabled)
864
if value:
865
self.enable()
866
else:
867
self.disable()
868
869
# last_checked_ok - property
870
@dbus_service_property(_interface, signature=u"s",
871
access=u"readwrite")
872
def last_checked_ok_dbus_property(self, value=None):
873
if value is not None:
874
self.checked_ok()
875
return
876
if self.last_checked_ok is None:
877
return dbus.String(u"")
878
return dbus.String(self._datetime_to_dbus(self
879
.last_checked_ok))
880
881
# timeout - property
882
@dbus_service_property(_interface, signature=u"t",
883
access=u"readwrite")
884
def timeout_dbus_property(self, value=None):
885
if value is None: # get
886
return dbus.UInt64(self.timeout_milliseconds())
887
self.timeout = datetime.timedelta(0, 0, 0, value)
888
# Emit D-Bus signal
889
self.PropertyChanged(dbus.String(u"timeout"),
890
dbus.UInt64(value, variant_level=1))
891
if getattr(self, u"disable_initiator_tag", None) is None:
892
return
893
# Reschedule timeout
894
gobject.source_remove(self.disable_initiator_tag)
895
self.disable_initiator_tag = None
896
time_to_die = (self.
897
_timedelta_to_milliseconds((self
898
.last_checked_ok
899
+ self.timeout)
900
- datetime.datetime
901
.utcnow()))
902
if time_to_die <= 0:
903
# The timeout has passed
904
self.disable()
905
else:
906
self.disable_initiator_tag = (gobject.timeout_add
907
(time_to_die, self.disable))
908
909
# interval - property
910
@dbus_service_property(_interface, signature=u"t",
911
access=u"readwrite")
912
def interval_dbus_property(self, value=None):
913
if value is None: # get
914
return dbus.UInt64(self.interval_milliseconds())
915
self.interval = datetime.timedelta(0, 0, 0, value)
916
# Emit D-Bus signal
917
self.PropertyChanged(dbus.String(u"interval"),
918
dbus.UInt64(value, variant_level=1))
919
if getattr(self, u"checker_initiator_tag", None) is None:
920
return
921
# Reschedule checker run
922
gobject.source_remove(self.checker_initiator_tag)
923
self.checker_initiator_tag = (gobject.timeout_add
924
(value, self.start_checker))
925
self.start_checker() # Start one now, too
926
927
# checker - property
928
@dbus_service_property(_interface, signature=u"s",
929
access=u"readwrite")
930
def checker_dbus_property(self, value=None):
931
if value is None: # get
932
return dbus.String(self.checker_command)
933
self.checker_command = value
934
# Emit D-Bus signal
935
self.PropertyChanged(dbus.String(u"checker"),
936
dbus.String(self.checker_command,
937
variant_level=1))
938
939
# checker_running - property
940
@dbus_service_property(_interface, signature=u"b",
941
access=u"readwrite")
942
def checker_running_dbus_property(self, value=None):
943
if value is None: # get
944
return dbus.Boolean(self.checker is not None)
945
if value:
946
self.start_checker()
947
else:
948
self.stop_checker()
949
950
# object_path - property
951
@dbus_service_property(_interface, signature=u"o", access=u"read")
952
def object_path_dbus_property(self):
953
return self.dbus_object_path # is already a dbus.ObjectPath
954
955
# secret = property
956
@dbus_service_property(_interface, signature=u"ay",
957
access=u"write", byte_arrays=True)
958
def secret_dbus_property(self, value):
959
self.secret = str(value)
960
961
del _interface
962
963
964
class ClientHandler(socketserver.BaseRequestHandler, object):
965
"""A class to handle client connections.
966
967
Instantiated once for each connection to handle it.
968
Note: This will run in its own forked process."""
969
970
def handle(self):
971
logger.info(u"TCP connection from: %s",
972
unicode(self.client_address))
973
logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
974
# Open IPC pipe to parent process
975
with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
976
session = (gnutls.connection
977
.ClientSession(self.request,
978
gnutls.connection
979
.X509Credentials()))
980
981
line = self.request.makefile().readline()
982
logger.debug(u"Protocol version: %r", line)
983
try:
984
if int(line.strip().split()[0]) > 1:
985
raise RuntimeError
986
except (ValueError, IndexError, RuntimeError), error:
987
logger.error(u"Unknown protocol version: %s", error)
988
return
989
990
# Note: gnutls.connection.X509Credentials is really a
991
# generic GnuTLS certificate credentials object so long as
992
# no X.509 keys are added to it. Therefore, we can use it
993
# here despite using OpenPGP certificates.
994
995
#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
996
# u"+AES-256-CBC", u"+SHA1",
997
# u"+COMP-NULL", u"+CTYPE-OPENPGP",
998
# u"+DHE-DSS"))
999
# Use a fallback default, since this MUST be set.
1000
priority = self.server.gnutls_priority
1001
if priority is None:
1002
priority = u"NORMAL"
1003
(gnutls.library.functions
1004
.gnutls_priority_set_direct(session._c_object,
1005
priority, None))
1006
1007
try:
1008
session.handshake()
1009
except gnutls.errors.GNUTLSError, error:
1010
logger.warning(u"Handshake failed: %s", error)
1011
# Do not run session.bye() here: the session is not
1012
# established. Just abandon the request.
1013
return
1014
logger.debug(u"Handshake succeeded")
1015
try:
1016
fpr = self.fingerprint(self.peer_certificate(session))
1017
except (TypeError, gnutls.errors.GNUTLSError), error:
1018
logger.warning(u"Bad certificate: %s", error)
1019
session.bye()
1020
return
1021
logger.debug(u"Fingerprint: %s", fpr)
1022
1023
for c in self.server.clients:
1024
if c.fingerprint == fpr:
1025
client = c
1026
break
1027
else:
1028
ipc.write(u"NOTFOUND %s %s\n"
1029
% (fpr, unicode(self.client_address)))
1030
session.bye()
1031
return
1032
# Have to check if client.still_valid(), since it is
1033
# possible that the client timed out while establishing
1034
# the GnuTLS session.
1035
if not client.still_valid():
1036
ipc.write(u"INVALID %s\n" % client.name)
1037
session.bye()
1038
return
1039
ipc.write(u"SENDING %s\n" % client.name)
1040
sent_size = 0
1041
while sent_size < len(client.secret):
1042
sent = session.send(client.secret[sent_size:])
1043
logger.debug(u"Sent: %d, remaining: %d",
1044
sent, len(client.secret)
1045
- (sent_size + sent))
1046
sent_size += sent
1047
session.bye()
1048
1049
@staticmethod
1050
def peer_certificate(session):
1051
"Return the peer's OpenPGP certificate as a bytestring"
1052
# If not an OpenPGP certificate...
1053
if (gnutls.library.functions
1054
.gnutls_certificate_type_get(session._c_object)
1055
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1056
# ...do the normal thing
1057
return session.peer_certificate
1058
list_size = ctypes.c_uint(1)
1059
cert_list = (gnutls.library.functions
1060
.gnutls_certificate_get_peers
1061
(session._c_object, ctypes.byref(list_size)))
1062
if not bool(cert_list) and list_size.value != 0:
1063
raise gnutls.errors.GNUTLSError(u"error getting peer"
1064
u" certificate")
1065
if list_size.value == 0:
68
if self.checker is None:
69
return
70
os.kill(self.checker.pid, signal.SIGTERM)
71
if self.checker.poll() is None:
72
os.kill(self.checker.pid, signal.SIGKILL)
73
self.checker = None
74
__del__ = stop_checker
75
def fileno(self):
76
if self.checker is None:
1066
77
return None
1067
cert = cert_list[0]
1068
return ctypes.string_at(cert.data, cert.size)
1069
1070
@staticmethod
1071
def fingerprint(openpgp):
1072
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1073
# New GnuTLS "datum" with the OpenPGP public key
1074
datum = (gnutls.library.types
1075
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1076
ctypes.POINTER
1077
(ctypes.c_ubyte)),
1078
ctypes.c_uint(len(openpgp))))
1079
# New empty GnuTLS certificate
1080
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1081
(gnutls.library.functions
1082
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1083
# Import the OpenPGP public key into the certificate
1084
(gnutls.library.functions
1085
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1086
gnutls.library.constants
1087
.GNUTLS_OPENPGP_FMT_RAW))
1088
# Verify the self signature in the key
1089
crtverify = ctypes.c_uint()
1090
(gnutls.library.functions
1091
.gnutls_openpgp_crt_verify_self(crt, 0,
1092
ctypes.byref(crtverify)))
1093
if crtverify.value != 0:
1094
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1095
raise (gnutls.errors.CertificateSecurityError
1096
(u"Verify failed"))
1097
# New buffer for the fingerprint
1098
buf = ctypes.create_string_buffer(20)
1099
buf_len = ctypes.c_size_t()
1100
# Get the fingerprint from the certificate into the buffer
1101
(gnutls.library.functions
1102
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1103
ctypes.byref(buf_len)))
1104
# Deinit the certificate
1105
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1106
# Convert the buffer to a Python bytestring
1107
fpr = ctypes.string_at(buf, buf_len.value)
1108
# Convert the bytestring to hexadecimal notation
1109
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1110
return hex_fpr
1111
1112
1113
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
1114
"""Like socketserver.ForkingMixIn, but also pass a pipe."""
1115
def process_request(self, request, client_address):
1116
"""Overrides and wraps the original process_request().
1117
1118
This function creates a new pipe in self.pipe
1119
"""
1120
self.pipe = os.pipe()
1121
super(ForkingMixInWithPipe,
1122
self).process_request(request, client_address)
1123
os.close(self.pipe[1]) # close write end
1124
self.add_pipe(self.pipe[0])
1125
def add_pipe(self, pipe):
1126
"""Dummy function; override as necessary"""
1127
os.close(pipe)
1128
1129
1130
class IPv6_TCPServer(ForkingMixInWithPipe,
1131
socketserver.TCPServer, object):
1132
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1133
1134
Attributes:
1135
enabled: Boolean; whether this server is activated yet
1136
interface: None or a network interface name (string)
1137
use_ipv6: Boolean; to use IPv6 or not
1138
"""
1139
def __init__(self, server_address, RequestHandlerClass,
1140
interface=None, use_ipv6=True):
1141
self.interface = interface
1142
if use_ipv6:
1143
self.address_family = socket.AF_INET6
1144
socketserver.TCPServer.__init__(self, server_address,
1145
RequestHandlerClass)
1146
def server_bind(self):
1147
"""This overrides the normal server_bind() function
1148
to bind to an interface if one was specified, and also NOT to
1149
bind to an address or port if they were not specified."""
1150
if self.interface is not None:
1151
if SO_BINDTODEVICE is None:
1152
logger.error(u"SO_BINDTODEVICE does not exist;"
1153
u" cannot bind to interface %s",
1154
self.interface)
1155
else:
78
return self.checker.stdout.fileno()
79
def next_stop(self):
80
"""The time when something must be done about this client"""
81
return min(self.last_seen + self.timeout, self.next_check)
82
def still_valid(self, now=None):
83
"""Has this client's timeout not passed?"""
84
if now is None:
85
now = datetime.datetime.now()
86
return now < (self.last_seen + timeout)
87
def it_is_time_to_check(self, now=None):
88
if now is None:
89
now = datetime.datetime.now()
90
return self.next_check <= now
91
92
93
class server_metaclass(type):
94
"Common behavior for the UDP and TCP server classes"
95
def __new__(cls, name, bases, attrs):
96
attrs["address_family"] = socket.AF_INET6
97
attrs["allow_reuse_address"] = True
98
def server_bind(self):
99
if self.options.interface:
100
if not hasattr(socket, "SO_BINDTODEVICE"):
101
# From /usr/include/asm-i486/socket.h
102
socket.SO_BINDTODEVICE = 25
1156
103
try:
1157
104
self.socket.setsockopt(socket.SOL_SOCKET,
1158
SO_BINDTODEVICE,
1159
str(self.interface
1160
+ u'\0'))
105
socket.SO_BINDTODEVICE,
106
self.options.interface)
1161
107
except socket.error, error:
1162
108
if error[0] == errno.EPERM:
1163
logger.error(u"No permission to"
1164
u" bind to interface %s",
1165
self.interface)
1166
elif error[0] == errno.ENOPROTOOPT:
1167
logger.error(u"SO_BINDTODEVICE not available;"
1168
u" cannot bind to interface %s",
1169
self.interface)
109
print "Warning: No permission to bind to interface", \
110
self.options.interface
1170
111
else:
1171
raise
1172
# Only bind(2) the socket if we really need to.
1173
if self.server_address[0] or self.server_address[1]:
1174
if not self.server_address[0]:
1175
if self.address_family == socket.AF_INET6:
1176
any_address = u"::" # in6addr_any
1177
else:
1178
any_address = socket.INADDR_ANY
1179
self.server_address = (any_address,
1180
self.server_address[1])
1181
elif not self.server_address[1]:
1182
self.server_address = (self.server_address[0],
1183
0)
1184
# if self.interface:
1185
# self.server_address = (self.server_address[0],
1186
# 0, # port
1187
# 0, # flowinfo
1188
# if_nametoindex
1189
# (self.interface))
1190
return socketserver.TCPServer.server_bind(self)
1191
1192
1193
class MandosServer(IPv6_TCPServer):
1194
"""Mandos server.
1195
1196
Attributes:
1197
clients: set of Client objects
1198
gnutls_priority GnuTLS priority string
1199
use_dbus: Boolean; to emit D-Bus signals or not
1200
1201
Assumes a gobject.MainLoop event loop.
1202
"""
1203
def __init__(self, server_address, RequestHandlerClass,
1204
interface=None, use_ipv6=True, clients=None,
1205
gnutls_priority=None, use_dbus=True):
1206
self.enabled = False
1207
self.clients = clients
1208
if self.clients is None:
1209
self.clients = set()
1210
self.use_dbus = use_dbus
1211
self.gnutls_priority = gnutls_priority
1212
IPv6_TCPServer.__init__(self, server_address,
1213
RequestHandlerClass,
1214
interface = interface,
1215
use_ipv6 = use_ipv6)
1216
def server_activate(self):
1217
if self.enabled:
1218
return socketserver.TCPServer.server_activate(self)
1219
def enable(self):
1220
self.enabled = True
1221
def add_pipe(self, pipe):
1222
# Call "handle_ipc" for both data and EOF events
1223
gobject.io_add_watch(pipe, gobject.IO_IN | gobject.IO_HUP,
1224
self.handle_ipc)
1225
def handle_ipc(self, source, condition, file_objects={}):
1226
condition_names = {
1227
gobject.IO_IN: u"IN", # There is data to read.
1228
gobject.IO_OUT: u"OUT", # Data can be written (without
1229
# blocking).
1230
gobject.IO_PRI: u"PRI", # There is urgent data to read.
1231
gobject.IO_ERR: u"ERR", # Error condition.
1232
gobject.IO_HUP: u"HUP" # Hung up (the connection has been
1233
# broken, usually for pipes and
1234
# sockets).
1235
}
1236
conditions_string = ' | '.join(name
1237
for cond, name in
1238
condition_names.iteritems()
1239
if cond & condition)
1240
logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
1241
conditions_string)
1242
1243
# Turn the pipe file descriptor into a Python file object
1244
if source not in file_objects:
1245
file_objects[source] = os.fdopen(source, u"r", 1)
1246
1247
# Read a line from the file object
1248
cmdline = file_objects[source].readline()
1249
if not cmdline: # Empty line means end of file
1250
# close the IPC pipe
1251
file_objects[source].close()
1252
del file_objects[source]
1253
1254
# Stop calling this function
1255
return False
1256
1257
logger.debug(u"IPC command: %r", cmdline)
1258
1259
# Parse and act on command
1260
cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
1261
1262
if cmd == u"NOTFOUND":
1263
logger.warning(u"Client not found for fingerprint: %s",
1264
args)
1265
if self.use_dbus:
1266
# Emit D-Bus signal
1267
mandos_dbus_service.ClientNotFound(args)
1268
elif cmd == u"INVALID":
1269
for client in self.clients:
1270
if client.name == args:
1271
logger.warning(u"Client %s is invalid", args)
1272
if self.use_dbus:
1273
# Emit D-Bus signal
1274
client.Rejected()
1275
break
1276
else:
1277
logger.error(u"Unknown client %s is invalid", args)
1278
elif cmd == u"SENDING":
1279
for client in self.clients:
1280
if client.name == args:
1281
logger.info(u"Sending secret to %s", client.name)
1282
client.checked_ok()
1283
if self.use_dbus:
1284
# Emit D-Bus signal
1285
client.ReceivedSecret()
1286
break
1287
else:
1288
logger.error(u"Sending secret to unknown client %s",
1289
args)
1290
else:
1291
logger.error(u"Unknown IPC command: %r", cmdline)
1292
1293
# Keep calling this function
1294
return True
1295
112
raise error
113
return super(type(self), self).server_bind()
114
attrs["server_bind"] = server_bind
115
def init(self, *args, **kwargs):
116
if "options" in kwargs:
117
self.options = kwargs["options"]
118
del kwargs["options"]
119
if "clients" in kwargs:
120
self.clients = kwargs["clients"]
121
del kwargs["clients"]
122
if "credentials" in kwargs:
123
self.credentials = kwargs["credentials"]
124
del kwargs["credentials"]
125
return super(type(self), self).__init__(*args, **kwargs)
126
attrs["__init__"] = init
127
return type.__new__(cls, name, bases, attrs)
128
129
130
class udp_handler(SocketServer.DatagramRequestHandler, object):
131
def handle(self):
132
self.wfile.write("Polo")
133
print "UDP request answered"
134
135
136
class IPv6_UDPServer(SocketServer.UDPServer, object):
137
__metaclass__ = server_metaclass
138
def verify_request(self, request, client_address):
139
print "UDP request came"
140
return request[0] == "Marco"
141
142
143
class tcp_handler(SocketServer.BaseRequestHandler, object):
144
def handle(self):
145
print "TCP request came"
146
print "Request:", self.request
147
print "Client Address:", self.client_address
148
print "Server:", self.server
149
session = gnutls.connection.ServerSession(self.request,
150
self.server.credentials)
151
session.handshake()
152
if session.peer_certificate:
153
print "DN:", session.peer_certificate.subject
154
try:
155
session.verify_peer()
156
except gnutls.errors.CertificateError, error:
157
print "Verify failed", error
158
session.bye()
159
return
160
try:
161
session.send(dict((client.dn, client.password)
162
for client in self.server.clients)
163
[session.peer_certificate.subject])
164
except KeyError:
165
session.send("gazonk")
166
# Log maybe? XXX
167
session.bye()
168
169
170
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
171
__metaclass__ = server_metaclass
172
request_queue_size = 1024
173
174
175
in6addr_any = "::"
1296
176
1297
177
def string_to_delta(interval):
1298
178
"""Parse a string and return a datetime.timedelta
1299
1300
>>> string_to_delta(u'7d')
179
180
>>> string_to_delta('7d')
1301
181
datetime.timedelta(7)
1302
>>> string_to_delta(u'60s')
182
>>> string_to_delta('60s')
1303
183
datetime.timedelta(0, 60)
1304
>>> string_to_delta(u'60m')
184
>>> string_to_delta('60m')
1305
185
datetime.timedelta(0, 3600)
1306
>>> string_to_delta(u'24h')
186
>>> string_to_delta('24h')
1307
187
datetime.timedelta(1)
1308
188
>>> string_to_delta(u'1w')
1309
189
datetime.timedelta(7)
1310
>>> string_to_delta(u'5m 30s')
1311
datetime.timedelta(0, 330)
1312
190
"""
1313
timevalue = datetime.timedelta(0)
1314
for s in interval.split():
1315
try:
1316
suffix = unicode(s[-1])
1317
value = int(s[:-1])
1318
if suffix == u"d":
1319
delta = datetime.timedelta(value)
1320
elif suffix == u"s":
1321
delta = datetime.timedelta(0, value)
1322
elif suffix == u"m":
1323
delta = datetime.timedelta(0, 0, 0, 0, value)
1324
elif suffix == u"h":
1325
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1326
elif suffix == u"w":
1327
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1328
else:
1329
raise ValueError
1330
except (ValueError, IndexError):
191
try:
192
suffix=unicode(interval[-1])
193
value=int(interval[:-1])
194
if suffix == u"d":
195
delta = datetime.timedelta(value)
196
elif suffix == u"s":
197
delta = datetime.timedelta(0, value)
198
elif suffix == u"m":
199
delta = datetime.timedelta(0, 0, 0, 0, value)
200
elif suffix == u"h":
201
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
202
elif suffix == u"w":
203
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
204
else:
1331
205
raise ValueError
1332
timevalue += delta
1333
return timevalue
1334
1335
1336
def if_nametoindex(interface):
1337
"""Call the C function if_nametoindex(), or equivalent
1338
1339
Note: This function cannot accept a unicode string."""
1340
global if_nametoindex
1341
try:
1342
if_nametoindex = (ctypes.cdll.LoadLibrary
1343
(ctypes.util.find_library(u"c"))
1344
.if_nametoindex)
1345
except (OSError, AttributeError):
1346
logger.warning(u"Doing if_nametoindex the hard way")
1347
def if_nametoindex(interface):
1348
"Get an interface index the hard way, i.e. using fcntl()"
1349
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1350
with closing(socket.socket()) as s:
1351
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1352
struct.pack(str(u"16s16x"),
1353
interface))
1354
interface_index = struct.unpack(str(u"I"),
1355
ifreq[16:20])[0]
1356
return interface_index
1357
return if_nametoindex(interface)
1358
1359
1360
def daemon(nochdir = False, noclose = False):
1361
"""See daemon(3). Standard BSD Unix function.
1362
1363
This should really exist as os.daemon, but it doesn't (yet)."""
1364
if os.fork():
1365
sys.exit()
1366
os.setsid()
1367
if not nochdir:
1368
os.chdir(u"/")
1369
if os.fork():
1370
sys.exit()
1371
if not noclose:
1372
# Close all standard open file descriptors
1373
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1374
if not stat.S_ISCHR(os.fstat(null).st_mode):
1375
raise OSError(errno.ENODEV,
1376
u"/dev/null not a character device")
1377
os.dup2(null, sys.stdin.fileno())
1378
os.dup2(null, sys.stdout.fileno())
1379
os.dup2(null, sys.stderr.fileno())
1380
if null > 2:
1381
os.close(null)
206
except (ValueError, IndexError):
207
raise ValueError
208
return delta
1382
209
1383
210
1384
211
def main():
1385
1386
##################################################################
1387
# Parsing of options, both command line and config file
1388
1389
parser = optparse.OptionParser(version = "%%prog %s" % version)
1390
parser.add_option("-i", u"--interface", type=u"string",
1391
metavar="IF", help=u"Bind to interface IF")
1392
parser.add_option("-a", u"--address", type=u"string",
1393
help=u"Address to listen for requests on")
1394
parser.add_option("-p", u"--port", type=u"int",
1395
help=u"Port number to receive requests on")
1396
parser.add_option("--check", action=u"store_true",
1397
help=u"Run self-test")
1398
parser.add_option("--debug", action=u"store_true",
1399
help=u"Debug mode; run in foreground and log to"
1400
u" terminal")
1401
parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1402
u" priority string (see GnuTLS documentation)")
1403
parser.add_option("--servicename", type=u"string",
1404
metavar=u"NAME", help=u"Zeroconf service name")
1405
parser.add_option("--configdir", type=u"string",
1406
default=u"/etc/mandos", metavar=u"DIR",
1407
help=u"Directory to search for configuration"
1408
u" files")
1409
parser.add_option("--no-dbus", action=u"store_false",
1410
dest=u"use_dbus", help=u"Do not provide D-Bus"
1411
u" system bus interface")
1412
parser.add_option("--no-ipv6", action=u"store_false",
1413
dest=u"use_ipv6", help=u"Do not use IPv6")
1414
options = parser.parse_args()[0]
1415
212
parser = OptionParser()
213
parser.add_option("-i", "--interface", type="string",
214
default="eth0", metavar="IF",
215
help="Interface to bind to")
216
parser.add_option("--cert", type="string", default="cert.pem",
217
metavar="FILE",
218
help="Public key certificate to use")
219
parser.add_option("--key", type="string", default="key.pem",
220
metavar="FILE",
221
help="Private key to use")
222
parser.add_option("--ca", type="string", default="ca.pem",
223
metavar="FILE",
224
help="Certificate Authority certificate to use")
225
parser.add_option("--crl", type="string", default="crl.pem",
226
metavar="FILE",
227
help="Certificate Revokation List to use")
228
parser.add_option("-p", "--port", type="int", default=49001,
229
help="Port number to receive requests on")
230
parser.add_option("--dh", type="int", metavar="BITS",
231
help="DH group to use")
232
parser.add_option("-t", "--timeout", type="string", # Parsed later
233
default="15m",
234
help="Amount of downtime allowed for clients")
235
parser.add_option("--interval", type="string", # Parsed later
236
default="5m",
237
help="How often to check that a client is up")
238
parser.add_option("--check", action="store_true", default=False,
239
help="Run self-test")
240
(options, args) = parser.parse_args()
241
1416
242
if options.check:
1417
243
import doctest
1418
244
doctest.testmod()
1419
245
sys.exit()
1420
246
1421
# Default values for config file for server-global settings
1422
server_defaults = { u"interface": u"",
1423
u"address": u"",
1424
u"port": u"",
1425
u"debug": u"False",
1426
u"priority":
1427
u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1428
u"servicename": u"Mandos",
1429
u"use_dbus": u"True",
1430
u"use_ipv6": u"True",
1431
}
1432
1433
# Parse config file for server-global settings
1434
server_config = configparser.SafeConfigParser(server_defaults)
1435
del server_defaults
1436
server_config.read(os.path.join(options.configdir,
1437
u"mandos.conf"))
1438
# Convert the SafeConfigParser object to a dict
1439
server_settings = server_config.defaults()
1440
# Use the appropriate methods on the non-string config options
1441
for option in (u"debug", u"use_dbus", u"use_ipv6"):
1442
server_settings[option] = server_config.getboolean(u"DEFAULT",
1443
option)
1444
if server_settings["port"]:
1445
server_settings["port"] = server_config.getint(u"DEFAULT",
1446
u"port")
1447
del server_config
1448
1449
# Override the settings from the config file with command line
1450
# options, if set.
1451
for option in (u"interface", u"address", u"port", u"debug",
1452
u"priority", u"servicename", u"configdir",
1453
u"use_dbus", u"use_ipv6"):
1454
value = getattr(options, option)
1455
if value is not None:
1456
server_settings[option] = value
1457
del options
1458
# Force all strings to be unicode
1459
for option in server_settings.keys():
1460
if type(server_settings[option]) is str:
1461
server_settings[option] = unicode(server_settings[option])
1462
# Now we have our good server settings in "server_settings"
1463
1464
##################################################################
1465
1466
# For convenience
1467
debug = server_settings[u"debug"]
1468
use_dbus = server_settings[u"use_dbus"]
1469
use_ipv6 = server_settings[u"use_ipv6"]
1470
1471
if not debug:
1472
syslogger.setLevel(logging.WARNING)
1473
console.setLevel(logging.WARNING)
1474
1475
if server_settings[u"servicename"] != u"Mandos":
1476
syslogger.setFormatter(logging.Formatter
1477
(u'Mandos (%s) [%%(process)d]:'
1478
u' %%(levelname)s: %%(message)s'
1479
% server_settings[u"servicename"]))
1480
1481
# Parse config file with clients
1482
client_defaults = { u"timeout": u"1h",
1483
u"interval": u"5m",
1484
u"checker": u"fping -q -- %%(host)s",
1485
u"host": u"",
1486
}
1487
client_config = configparser.SafeConfigParser(client_defaults)
1488
client_config.read(os.path.join(server_settings[u"configdir"],
1489
u"clients.conf"))
1490
1491
global mandos_dbus_service
1492
mandos_dbus_service = None
1493
1494
tcp_server = MandosServer((server_settings[u"address"],
1495
server_settings[u"port"]),
1496
ClientHandler,
1497
interface=server_settings[u"interface"],
1498
use_ipv6=use_ipv6,
1499
gnutls_priority=
1500
server_settings[u"priority"],
1501
use_dbus=use_dbus)
1502
pidfilename = u"/var/run/mandos.pid"
1503
try:
1504
pidfile = open(pidfilename, u"w")
1505
except IOError:
1506
logger.error(u"Could not open file %r", pidfilename)
1507
1508
try:
1509
uid = pwd.getpwnam(u"_mandos").pw_uid
1510
gid = pwd.getpwnam(u"_mandos").pw_gid
1511
except KeyError:
1512
try:
1513
uid = pwd.getpwnam(u"mandos").pw_uid
1514
gid = pwd.getpwnam(u"mandos").pw_gid
1515
except KeyError:
1516
try:
1517
uid = pwd.getpwnam(u"nobody").pw_uid
1518
gid = pwd.getpwnam(u"nobody").pw_gid
1519
except KeyError:
1520
uid = 65534
1521
gid = 65534
1522
try:
1523
os.setgid(gid)
1524
os.setuid(uid)
1525
except OSError, error:
1526
if error[0] != errno.EPERM:
1527
raise error
1528
1529
# Enable all possible GnuTLS debugging
1530
if debug:
1531
# "Use a log level over 10 to enable all debugging options."
1532
# - GnuTLS manual
1533
gnutls.library.functions.gnutls_global_set_log_level(11)
1534
1535
@gnutls.library.types.gnutls_log_func
1536
def debug_gnutls(level, string):
1537
logger.debug(u"GnuTLS: %s", string[:-1])
1538
1539
(gnutls.library.functions
1540
.gnutls_global_set_log_function(debug_gnutls))
1541
1542
global main_loop
1543
# From the Avahi example code
1544
DBusGMainLoop(set_as_default=True )
1545
main_loop = gobject.MainLoop()
1546
bus = dbus.SystemBus()
1547
# End of Avahi example code
1548
if use_dbus:
1549
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1550
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1551
service = AvahiService(name = server_settings[u"servicename"],
1552
servicetype = u"_mandos._tcp",
1553
protocol = protocol, bus = bus)
1554
if server_settings["interface"]:
1555
service.interface = (if_nametoindex
1556
(str(server_settings[u"interface"])))
1557
1558
client_class = Client
1559
if use_dbus:
1560
client_class = functools.partial(ClientDBus, bus = bus)
1561
tcp_server.clients.update(set(
1562
client_class(name = section,
1563
config= dict(client_config.items(section)))
1564
for section in client_config.sections()))
1565
if not tcp_server.clients:
1566
logger.warning(u"No clients defined")
1567
1568
if debug:
1569
# Redirect stdin so all checkers get /dev/null
1570
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1571
os.dup2(null, sys.stdin.fileno())
1572
if null > 2:
1573
os.close(null)
1574
else:
1575
# No console logging
1576
logger.removeHandler(console)
1577
# Close all input and output, do double fork, etc.
1578
daemon()
1579
1580
try:
1581
with closing(pidfile):
1582
pid = os.getpid()
1583
pidfile.write(str(pid) + "\n")
1584
del pidfile
1585
except IOError:
1586
logger.error(u"Could not write to file %r with PID %d",
1587
pidfilename, pid)
1588
except NameError:
1589
# "pidfile" was never created
1590
pass
1591
del pidfilename
1592
1593
def cleanup():
1594
"Cleanup function; run on exit"
1595
service.cleanup()
1596
1597
while tcp_server.clients:
1598
client = tcp_server.clients.pop()
1599
client.disable_hook = None
1600
client.disable()
1601
1602
atexit.register(cleanup)
1603
1604
if not debug:
1605
signal.signal(signal.SIGINT, signal.SIG_IGN)
1606
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1607
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1608
1609
if use_dbus:
1610
class MandosDBusService(dbus.service.Object):
1611
"""A D-Bus proxy object"""
1612
def __init__(self):
1613
dbus.service.Object.__init__(self, bus, u"/")
1614
_interface = u"se.bsnet.fukt.Mandos"
1615
1616
@dbus.service.signal(_interface, signature=u"oa{sv}")
1617
def ClientAdded(self, objpath, properties):
1618
"D-Bus signal"
1619
pass
1620
1621
@dbus.service.signal(_interface, signature=u"s")
1622
def ClientNotFound(self, fingerprint):
1623
"D-Bus signal"
1624
pass
1625
1626
@dbus.service.signal(_interface, signature=u"os")
1627
def ClientRemoved(self, objpath, name):
1628
"D-Bus signal"
1629
pass
1630
1631
@dbus.service.method(_interface, out_signature=u"ao")
1632
def GetAllClients(self):
1633
"D-Bus method"
1634
return dbus.Array(c.dbus_object_path
1635
for c in tcp_server.clients)
1636
1637
@dbus.service.method(_interface,
1638
out_signature=u"a{oa{sv}}")
1639
def GetAllClientsWithProperties(self):
1640
"D-Bus method"
1641
return dbus.Dictionary(
1642
((c.dbus_object_path, c.GetAll(u""))
1643
for c in tcp_server.clients),
1644
signature=u"oa{sv}")
1645
1646
@dbus.service.method(_interface, in_signature=u"o")
1647
def RemoveClient(self, object_path):
1648
"D-Bus method"
1649
for c in tcp_server.clients:
1650
if c.dbus_object_path == object_path:
1651
tcp_server.clients.remove(c)
1652
c.remove_from_connection()
1653
# Don't signal anything except ClientRemoved
1654
c.disable(signal=False)
1655
# Emit D-Bus signal
1656
self.ClientRemoved(object_path, c.name)
1657
return
1658
raise KeyError
1659
1660
del _interface
1661
1662
mandos_dbus_service = MandosDBusService()
1663
1664
for client in tcp_server.clients:
1665
if use_dbus:
1666
# Emit D-Bus signal
1667
mandos_dbus_service.ClientAdded(client.dbus_object_path,
1668
client.GetAll(u""))
1669
client.enable()
1670
1671
tcp_server.enable()
1672
tcp_server.server_activate()
1673
1674
# Find out what port we got
1675
service.port = tcp_server.socket.getsockname()[1]
1676
if use_ipv6:
1677
logger.info(u"Now listening on address %r, port %d,"
1678
" flowinfo %d, scope_id %d"
1679
% tcp_server.socket.getsockname())
1680
else: # IPv4
1681
logger.info(u"Now listening on address %r, port %d"
1682
% tcp_server.socket.getsockname())
1683
1684
#service.interface = tcp_server.socket.getsockname()[3]
1685
1686
try:
1687
# From the Avahi example code
1688
try:
1689
service.activate()
1690
except dbus.exceptions.DBusException, error:
1691
logger.critical(u"DBusException: %s", error)
1692
sys.exit(1)
1693
# End of Avahi example code
1694
1695
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1696
lambda *args, **kwargs:
1697
(tcp_server.handle_request
1698
(*args[2:], **kwargs) or True))
1699
1700
logger.debug(u"Starting main loop")
1701
main_loop.run()
1702
except AvahiError, error:
1703
logger.critical(u"AvahiError: %s", error)
1704
sys.exit(1)
1705
except KeyboardInterrupt:
1706
if debug:
1707
print >> sys.stderr
1708
logger.debug(u"Server received KeyboardInterrupt")
1709
logger.debug(u"Server exiting")
1710
1711
if __name__ == '__main__':
247
# Parse the time arguments
248
try:
249
options.timeout = string_to_delta(options.timeout)
250
except ValueError:
251
parser.error("option --timeout: Unparseable time")
252
253
try:
254
options.interval = string_to_delta(options.interval)
255
except ValueError:
256
parser.error("option --interval: Unparseable time")
257
258
cert = gnutls.crypto.X509Certificate(open(options.cert).read())
259
key = gnutls.crypto.X509PrivateKey(open(options.key).read())
260
ca = gnutls.crypto.X509Certificate(open(options.ca).read())
261
crl = gnutls.crypto.X509CRL(open(options.crl).read())
262
cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
263
264
# Parse config file
265
defaults = {}
266
client_config_object = ConfigParser.SafeConfigParser(defaults)
267
client_config_object.read("mandos-clients.conf")
268
clients = [Client(name=section, options=options,
269
**(dict(client_config_object.items(section))))
270
for section in client_config_object.sections()]
271
272
udp_server = IPv6_UDPServer((in6addr_any, options.port),
273
udp_handler,
274
options=options)
275
276
tcp_server = IPv6_TCPServer((in6addr_any, options.port),
277
tcp_handler,
278
options=options,
279
clients=clients,
280
credentials=cred)
281
282
while True:
283
try:
284
input, out, err = select.select((udp_server,
285
tcp_server), (), ())
286
if not input:
287
pass
288
else:
289
for obj in input:
290
obj.handle_request()
291
except KeyboardInterrupt:
292
break
293
294
# Cleanup here
295
for client in clients:
296
client.stop_checker()
297
298
299
if __name__ == "__main__":
1712
300
main()
301
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0