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- Committer: Teddy Hogeborn
- Date: 2011-07-15 01:07:51 UTC
- mto: (24.1.175 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 284.
- Revision ID: teddy@fukt.bsnet.se-20110715010751-bh9rhcm6hv8f174e
* initramfs-tools-script: Bug fix: Add missing "--options" argument to
getopt.
getopt.
- files added:
- DBUS-API
- debian/source
- files removed:
- debian/mandos-client.config
- files modified:
- .bzrignore
added
removed
mandos
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add" and "remove" in the "AvahiService" class, the
10
# "server_state_changed" and "entry_group_state_changed" functions,
11
# and some lines in "main".
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
12
#
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13
# Everything else is
14
# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
14
# Copyright © 2008-2011 Teddy Hogeborn
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# Copyright © 2008-2011 Björn Påhlsson
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16
#
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# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
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# Contact the authors at <mandos@fukt.bsnet.se>.
31
32
#
32
33
33
from __future__ import division, with_statement, absolute_import
34
from __future__ import (division, absolute_import, print_function,
35
unicode_literals)
34
36
35
import SocketServer
37
import SocketServer as socketserver
36
38
import socket
37
from optparse import OptionParser
39
import argparse
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40
import datetime
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import errno
40
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import gnutls.crypto
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45
import gnutls.library.functions
44
46
import gnutls.library.constants
45
47
import gnutls.library.types
46
import ConfigParser
48
import ConfigParser as configparser
47
49
import sys
48
50
import re
49
51
import os
50
52
import signal
51
from sets import Set
52
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import subprocess
53
54
import atexit
54
55
import stat
55
56
import logging
56
57
import logging.handlers
57
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import pwd
58
from contextlib import closing
59
import contextlib
60
import struct
61
import fcntl
62
import functools
63
import cPickle as pickle
64
import multiprocessing
59
65
60
66
import dbus
67
import dbus.service
61
68
import gobject
62
69
import avahi
63
70
from dbus.mainloop.glib import DBusGMainLoop
64
71
import ctypes
65
72
import ctypes.util
66
67
version = "1.0.2"
68
73
import xml.dom.minidom
74
import inspect
75
76
try:
77
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
78
except AttributeError:
79
try:
80
from IN import SO_BINDTODEVICE
81
except ImportError:
82
SO_BINDTODEVICE = None
83
84
85
version = "1.3.0"
86
87
#logger = logging.getLogger('mandos')
69
88
logger = logging.Logger('mandos')
70
syslogger = logging.handlers.SysLogHandler\
71
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
72
address = "/dev/log")
73
syslogger.setFormatter(logging.Formatter\
74
('Mandos: %(levelname)s: %(message)s'))
89
syslogger = (logging.handlers.SysLogHandler
90
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
91
address = str("/dev/log")))
92
syslogger.setFormatter(logging.Formatter
93
('Mandos [%(process)d]: %(levelname)s:'
94
' %(message)s'))
75
95
logger.addHandler(syslogger)
76
96
77
97
console = logging.StreamHandler()
78
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
98
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
' %(levelname)s:'
79
100
' %(message)s'))
80
101
logger.addHandler(console)
81
102
82
103
class AvahiError(Exception):
83
def __init__(self, value):
104
def __init__(self, value, *args, **kwargs):
84
105
self.value = value
85
super(AvahiError, self).__init__()
86
def __str__(self):
87
return repr(self.value)
106
super(AvahiError, self).__init__(value, *args, **kwargs)
107
def __unicode__(self):
108
return unicode(repr(self.value))
88
109
89
110
class AvahiServiceError(AvahiError):
90
111
pass
95
116
96
117
class AvahiService(object):
97
118
"""An Avahi (Zeroconf) service.
119
98
120
Attributes:
99
121
interface: integer; avahi.IF_UNSPEC or an interface index.
100
122
Used to optionally bind to the specified interface.
108
130
max_renames: integer; maximum number of renames
109
131
rename_count: integer; counter so we only rename after collisions
110
132
a sensible number of times
133
group: D-Bus Entry Group
134
server: D-Bus Server
135
bus: dbus.SystemBus()
111
136
"""
112
137
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
113
servicetype = None, port = None, TXT = None, domain = "",
114
host = "", max_renames = 32768):
138
servicetype = None, port = None, TXT = None,
139
domain = "", host = "", max_renames = 32768,
140
protocol = avahi.PROTO_UNSPEC, bus = None):
115
141
self.interface = interface
116
142
self.name = name
117
143
self.type = servicetype
118
144
self.port = port
119
if TXT is None:
120
self.TXT = []
121
else:
122
self.TXT = TXT
145
self.TXT = TXT if TXT is not None else []
123
146
self.domain = domain
124
147
self.host = host
125
148
self.rename_count = 0
126
149
self.max_renames = max_renames
150
self.protocol = protocol
151
self.group = None # our entry group
152
self.server = None
153
self.bus = bus
154
self.entry_group_state_changed_match = None
127
155
def rename(self):
128
156
"""Derived from the Avahi example code"""
129
157
if self.rename_count >= self.max_renames:
130
logger.critical(u"No suitable Zeroconf service name found"
131
u" after %i retries, exiting.",
158
logger.critical("No suitable Zeroconf service name found"
159
" after %i retries, exiting.",
132
160
self.rename_count)
133
161
raise AvahiServiceError("Too many renames")
134
self.name = server.GetAlternativeServiceName(self.name)
135
logger.info(u"Changing Zeroconf service name to %r ...",
136
str(self.name))
137
syslogger.setFormatter(logging.Formatter\
138
('Mandos (%s): %%(levelname)s:'
139
' %%(message)s' % self.name))
162
self.name = unicode(self.server.GetAlternativeServiceName(self.name))
163
logger.info("Changing Zeroconf service name to %r ...",
164
self.name)
165
syslogger.setFormatter(logging.Formatter
166
('Mandos (%s) [%%(process)d]:'
167
' %%(levelname)s: %%(message)s'
168
% self.name))
140
169
self.remove()
141
self.add()
170
try:
171
self.add()
172
except dbus.exceptions.DBusException as error:
173
logger.critical("DBusException: %s", error)
174
self.cleanup()
175
os._exit(1)
142
176
self.rename_count += 1
143
177
def remove(self):
144
178
"""Derived from the Avahi example code"""
145
if group is not None:
146
group.Reset()
179
if self.entry_group_state_changed_match is not None:
180
self.entry_group_state_changed_match.remove()
181
self.entry_group_state_changed_match = None
182
if self.group is not None:
183
self.group.Reset()
147
184
def add(self):
148
185
"""Derived from the Avahi example code"""
149
global group
150
if group is None:
151
group = dbus.Interface\
152
(bus.get_object(avahi.DBUS_NAME,
153
server.EntryGroupNew()),
154
avahi.DBUS_INTERFACE_ENTRY_GROUP)
155
group.connect_to_signal('StateChanged',
156
entry_group_state_changed)
157
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
158
service.name, service.type)
159
group.AddService(
160
self.interface, # interface
161
avahi.PROTO_INET6, # protocol
162
dbus.UInt32(0), # flags
163
self.name, self.type,
164
self.domain, self.host,
165
dbus.UInt16(self.port),
166
avahi.string_array_to_txt_array(self.TXT))
167
group.Commit()
168
169
# From the Avahi example code:
170
group = None # our entry group
171
# End of Avahi example code
186
self.remove()
187
if self.group is None:
188
self.group = dbus.Interface(
189
self.bus.get_object(avahi.DBUS_NAME,
190
self.server.EntryGroupNew()),
191
avahi.DBUS_INTERFACE_ENTRY_GROUP)
192
self.entry_group_state_changed_match = (
193
self.group.connect_to_signal(
194
'StateChanged', self .entry_group_state_changed))
195
logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
196
self.name, self.type)
197
self.group.AddService(
198
self.interface,
199
self.protocol,
200
dbus.UInt32(0), # flags
201
self.name, self.type,
202
self.domain, self.host,
203
dbus.UInt16(self.port),
204
avahi.string_array_to_txt_array(self.TXT))
205
self.group.Commit()
206
def entry_group_state_changed(self, state, error):
207
"""Derived from the Avahi example code"""
208
logger.debug("Avahi entry group state change: %i", state)
209
210
if state == avahi.ENTRY_GROUP_ESTABLISHED:
211
logger.debug("Zeroconf service established.")
212
elif state == avahi.ENTRY_GROUP_COLLISION:
213
logger.info("Zeroconf service name collision.")
214
self.rename()
215
elif state == avahi.ENTRY_GROUP_FAILURE:
216
logger.critical("Avahi: Error in group state changed %s",
217
unicode(error))
218
raise AvahiGroupError("State changed: %s"
219
% unicode(error))
220
def cleanup(self):
221
"""Derived from the Avahi example code"""
222
if self.group is not None:
223
try:
224
self.group.Free()
225
except (dbus.exceptions.UnknownMethodException,
226
dbus.exceptions.DBusException) as e:
227
pass
228
self.group = None
229
self.remove()
230
def server_state_changed(self, state, error=None):
231
"""Derived from the Avahi example code"""
232
logger.debug("Avahi server state change: %i", state)
233
bad_states = { avahi.SERVER_INVALID:
234
"Zeroconf server invalid",
235
avahi.SERVER_REGISTERING: None,
236
avahi.SERVER_COLLISION:
237
"Zeroconf server name collision",
238
avahi.SERVER_FAILURE:
239
"Zeroconf server failure" }
240
if state in bad_states:
241
if bad_states[state] is not None:
242
if error is None:
243
logger.error(bad_states[state])
244
else:
245
logger.error(bad_states[state] + ": %r", error)
246
self.cleanup()
247
elif state == avahi.SERVER_RUNNING:
248
self.add()
249
else:
250
if error is None:
251
logger.debug("Unknown state: %r", state)
252
else:
253
logger.debug("Unknown state: %r: %r", state, error)
254
def activate(self):
255
"""Derived from the Avahi example code"""
256
if self.server is None:
257
self.server = dbus.Interface(
258
self.bus.get_object(avahi.DBUS_NAME,
259
avahi.DBUS_PATH_SERVER,
260
follow_name_owner_changes=True),
261
avahi.DBUS_INTERFACE_SERVER)
262
self.server.connect_to_signal("StateChanged",
263
self.server_state_changed)
264
self.server_state_changed(self.server.GetState())
172
265
173
266
174
267
class Client(object):
175
268
"""A representation of a client host served by this server.
269
176
270
Attributes:
177
name: string; from the config file, used in log messages
271
_approved: bool(); 'None' if not yet approved/disapproved
272
approval_delay: datetime.timedelta(); Time to wait for approval
273
approval_duration: datetime.timedelta(); Duration of one approval
274
checker: subprocess.Popen(); a running checker process used
275
to see if the client lives.
276
'None' if no process is running.
277
checker_callback_tag: a gobject event source tag, or None
278
checker_command: string; External command which is run to check
279
if client lives. %() expansions are done at
280
runtime with vars(self) as dict, so that for
281
instance %(name)s can be used in the command.
282
checker_initiator_tag: a gobject event source tag, or None
283
created: datetime.datetime(); (UTC) object creation
284
current_checker_command: string; current running checker_command
285
disable_hook: If set, called by disable() as disable_hook(self)
286
disable_initiator_tag: a gobject event source tag, or None
287
enabled: bool()
178
288
fingerprint: string (40 or 32 hexadecimal digits); used to
179
289
uniquely identify the client
180
secret: bytestring; sent verbatim (over TLS) to client
181
host: string; available for use by the checker command
182
created: datetime.datetime(); object creation, not client host
183
last_checked_ok: datetime.datetime() or None if not yet checked OK
184
timeout: datetime.timedelta(); How long from last_checked_ok
185
until this client is invalid
186
interval: datetime.timedelta(); How often to start a new checker
187
stop_hook: If set, called by stop() as stop_hook(self)
188
checker: subprocess.Popen(); a running checker process used
189
to see if the client lives.
190
'None' if no process is running.
191
checker_initiator_tag: a gobject event source tag, or None
192
stop_initiator_tag: - '' -
193
checker_callback_tag: - '' -
194
checker_command: string; External command which is run to check if
195
client lives. %() expansions are done at
196
runtime with vars(self) as dict, so that for
197
instance %(name)s can be used in the command.
198
Private attibutes:
199
_timeout: Real variable for 'timeout'
200
_interval: Real variable for 'interval'
201
_timeout_milliseconds: Used when calling gobject.timeout_add()
202
_interval_milliseconds: - '' -
290
host: string; available for use by the checker command
291
interval: datetime.timedelta(); How often to start a new checker
292
last_approval_request: datetime.datetime(); (UTC) or None
293
last_checked_ok: datetime.datetime(); (UTC) or None
294
last_enabled: datetime.datetime(); (UTC)
295
name: string; from the config file, used in log messages and
296
D-Bus identifiers
297
secret: bytestring; sent verbatim (over TLS) to client
298
timeout: datetime.timedelta(); How long from last_checked_ok
299
until this client is disabled
300
runtime_expansions: Allowed attributes for runtime expansion.
203
301
"""
204
def _set_timeout(self, timeout):
205
"Setter function for 'timeout' attribute"
206
self._timeout = timeout
207
self._timeout_milliseconds = ((self.timeout.days
208
* 24 * 60 * 60 * 1000)
209
+ (self.timeout.seconds * 1000)
210
+ (self.timeout.microseconds
211
// 1000))
212
timeout = property(lambda self: self._timeout,
213
_set_timeout)
214
del _set_timeout
215
def _set_interval(self, interval):
216
"Setter function for 'interval' attribute"
217
self._interval = interval
218
self._interval_milliseconds = ((self.interval.days
219
* 24 * 60 * 60 * 1000)
220
+ (self.interval.seconds
221
* 1000)
222
+ (self.interval.microseconds
223
// 1000))
224
interval = property(lambda self: self._interval,
225
_set_interval)
226
del _set_interval
227
def __init__(self, name = None, stop_hook=None, config=None):
302
303
runtime_expansions = ("approval_delay", "approval_duration",
304
"created", "enabled", "fingerprint",
305
"host", "interval", "last_checked_ok",
306
"last_enabled", "name", "timeout")
307
308
@staticmethod
309
def _timedelta_to_milliseconds(td):
310
"Convert a datetime.timedelta() to milliseconds"
311
return ((td.days * 24 * 60 * 60 * 1000)
312
+ (td.seconds * 1000)
313
+ (td.microseconds // 1000))
314
315
def timeout_milliseconds(self):
316
"Return the 'timeout' attribute in milliseconds"
317
return self._timedelta_to_milliseconds(self.timeout)
318
319
def interval_milliseconds(self):
320
"Return the 'interval' attribute in milliseconds"
321
return self._timedelta_to_milliseconds(self.interval)
322
323
def approval_delay_milliseconds(self):
324
return self._timedelta_to_milliseconds(self.approval_delay)
325
326
def __init__(self, name = None, disable_hook=None, config=None):
228
327
"""Note: the 'checker' key in 'config' sets the
229
328
'checker_command' attribute and *not* the 'checker'
230
329
attribute."""
330
self.name = name
231
331
if config is None:
232
332
config = {}
233
self.name = name
234
logger.debug(u"Creating client %r", self.name)
333
logger.debug("Creating client %r", self.name)
235
334
# Uppercase and remove spaces from fingerprint for later
236
335
# comparison purposes with return value from the fingerprint()
237
336
# function
238
self.fingerprint = config["fingerprint"].upper()\
239
.replace(u" ", u"")
240
logger.debug(u" Fingerprint: %s", self.fingerprint)
337
self.fingerprint = (config["fingerprint"].upper()
338
.replace(" ", ""))
339
logger.debug(" Fingerprint: %s", self.fingerprint)
241
340
if "secret" in config:
242
self.secret = config["secret"].decode(u"base64")
341
self.secret = config["secret"].decode("base64")
243
342
elif "secfile" in config:
244
with closing(open(os.path.expanduser
245
(os.path.expandvars
246
(config["secfile"])))) \
247
as secfile:
343
with open(os.path.expanduser(os.path.expandvars
344
(config["secfile"])),
345
"rb") as secfile:
248
346
self.secret = secfile.read()
249
347
else:
250
raise TypeError(u"No secret or secfile for client %s"
348
raise TypeError("No secret or secfile for client %s"
251
349
% self.name)
252
350
self.host = config.get("host", "")
253
self.created = datetime.datetime.now()
351
self.created = datetime.datetime.utcnow()
352
self.enabled = False
353
self.last_approval_request = None
354
self.last_enabled = None
254
355
self.last_checked_ok = None
255
356
self.timeout = string_to_delta(config["timeout"])
256
357
self.interval = string_to_delta(config["interval"])
257
self.stop_hook = stop_hook
358
self.disable_hook = disable_hook
258
359
self.checker = None
259
360
self.checker_initiator_tag = None
260
self.stop_initiator_tag = None
361
self.disable_initiator_tag = None
261
362
self.checker_callback_tag = None
262
self.check_command = config["checker"]
263
def start(self):
363
self.checker_command = config["checker"]
364
self.current_checker_command = None
365
self.last_connect = None
366
self._approved = None
367
self.approved_by_default = config.get("approved_by_default",
368
True)
369
self.approvals_pending = 0
370
self.approval_delay = string_to_delta(
371
config["approval_delay"])
372
self.approval_duration = string_to_delta(
373
config["approval_duration"])
374
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
375
376
def send_changedstate(self):
377
self.changedstate.acquire()
378
self.changedstate.notify_all()
379
self.changedstate.release()
380
381
def enable(self):
264
382
"""Start this client's checker and timeout hooks"""
383
if getattr(self, "enabled", False):
384
# Already enabled
385
return
386
self.send_changedstate()
387
self.last_enabled = datetime.datetime.utcnow()
265
388
# Schedule a new checker to be started an 'interval' from now,
266
389
# and every interval from then on.
267
self.checker_initiator_tag = gobject.timeout_add\
268
(self._interval_milliseconds,
269
self.start_checker)
390
self.checker_initiator_tag = (gobject.timeout_add
391
(self.interval_milliseconds(),
392
self.start_checker))
393
# Schedule a disable() when 'timeout' has passed
394
self.disable_initiator_tag = (gobject.timeout_add
395
(self.timeout_milliseconds(),
396
self.disable))
397
self.enabled = True
270
398
# Also start a new checker *right now*.
271
399
self.start_checker()
272
# Schedule a stop() when 'timeout' has passed
273
self.stop_initiator_tag = gobject.timeout_add\
274
(self._timeout_milliseconds,
275
self.stop)
276
def stop(self):
277
"""Stop this client.
278
The possibility that a client might be restarted is left open,
279
but not currently used."""
280
# If this client doesn't have a secret, it is already stopped.
281
if hasattr(self, "secret") and self.secret:
282
logger.info(u"Stopping client %s", self.name)
283
self.secret = None
284
else:
400
401
def disable(self, quiet=True):
402
"""Disable this client."""
403
if not getattr(self, "enabled", False):
285
404
return False
286
if getattr(self, "stop_initiator_tag", False):
287
gobject.source_remove(self.stop_initiator_tag)
288
self.stop_initiator_tag = None
405
if not quiet:
406
self.send_changedstate()
407
if not quiet:
408
logger.info("Disabling client %s", self.name)
409
if getattr(self, "disable_initiator_tag", False):
410
gobject.source_remove(self.disable_initiator_tag)
411
self.disable_initiator_tag = None
289
412
if getattr(self, "checker_initiator_tag", False):
290
413
gobject.source_remove(self.checker_initiator_tag)
291
414
self.checker_initiator_tag = None
292
415
self.stop_checker()
293
if self.stop_hook:
294
self.stop_hook(self)
416
if self.disable_hook:
417
self.disable_hook(self)
418
self.enabled = False
295
419
# Do not run this again if called by a gobject.timeout_add
296
420
return False
421
297
422
def __del__(self):
298
self.stop_hook = None
299
self.stop()
300
def checker_callback(self, pid, condition):
423
self.disable_hook = None
424
self.disable()
425
426
def checker_callback(self, pid, condition, command):
301
427
"""The checker has completed, so take appropriate actions."""
302
428
self.checker_callback_tag = None
303
429
self.checker = None
304
if os.WIFEXITED(condition) \
305
and (os.WEXITSTATUS(condition) == 0):
306
logger.info(u"Checker for %(name)s succeeded",
307
vars(self))
308
self.bump_timeout()
309
elif not os.WIFEXITED(condition):
310
logger.warning(u"Checker for %(name)s crashed?",
430
if os.WIFEXITED(condition):
431
exitstatus = os.WEXITSTATUS(condition)
432
if exitstatus == 0:
433
logger.info("Checker for %(name)s succeeded",
434
vars(self))
435
self.checked_ok()
436
else:
437
logger.info("Checker for %(name)s failed",
438
vars(self))
439
else:
440
logger.warning("Checker for %(name)s crashed?",
311
441
vars(self))
312
else:
313
logger.info(u"Checker for %(name)s failed",
314
vars(self))
315
def bump_timeout(self):
442
443
def checked_ok(self):
316
444
"""Bump up the timeout for this client.
445
317
446
This should only be called when the client has been seen,
318
447
alive and well.
319
448
"""
320
self.last_checked_ok = datetime.datetime.now()
321
gobject.source_remove(self.stop_initiator_tag)
322
self.stop_initiator_tag = gobject.timeout_add\
323
(self._timeout_milliseconds, self.stop)
449
self.last_checked_ok = datetime.datetime.utcnow()
450
gobject.source_remove(self.disable_initiator_tag)
451
self.disable_initiator_tag = (gobject.timeout_add
452
(self.timeout_milliseconds(),
453
self.disable))
454
455
def need_approval(self):
456
self.last_approval_request = datetime.datetime.utcnow()
457
324
458
def start_checker(self):
325
459
"""Start a new checker subprocess if one is not running.
460
326
461
If a checker already exists, leave it running and do
327
462
nothing."""
328
463
# The reason for not killing a running checker is that if we
331
466
# client would inevitably timeout, since no checker would get
332
467
# a chance to run to completion. If we instead leave running
333
468
# checkers alone, the checker would have to take more time
334
# than 'timeout' for the client to be declared invalid, which
335
# is as it should be.
469
# than 'timeout' for the client to be disabled, which is as it
470
# should be.
471
472
# If a checker exists, make sure it is not a zombie
473
try:
474
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
475
except (AttributeError, OSError) as error:
476
if (isinstance(error, OSError)
477
and error.errno != errno.ECHILD):
478
raise error
479
else:
480
if pid:
481
logger.warning("Checker was a zombie")
482
gobject.source_remove(self.checker_callback_tag)
483
self.checker_callback(pid, status,
484
self.current_checker_command)
485
# Start a new checker if needed
336
486
if self.checker is None:
337
487
try:
338
# In case check_command has exactly one % operator
339
command = self.check_command % self.host
488
# In case checker_command has exactly one % operator
489
command = self.checker_command % self.host
340
490
except TypeError:
341
491
# Escape attributes for the shell
342
escaped_attrs = dict((key, re.escape(str(val)))
343
for key, val in
344
vars(self).iteritems())
492
escaped_attrs = dict(
493
(attr,
494
re.escape(unicode(str(getattr(self, attr, "")),
495
errors=
496
'replace')))
497
for attr in
498
self.runtime_expansions)
499
345
500
try:
346
command = self.check_command % escaped_attrs
347
except TypeError, error:
348
logger.error(u'Could not format string "%s":'
349
u' %s', self.check_command, error)
501
command = self.checker_command % escaped_attrs
502
except TypeError as error:
503
logger.error('Could not format string "%s":'
504
' %s', self.checker_command, error)
350
505
return True # Try again later
506
self.current_checker_command = command
351
507
try:
352
logger.info(u"Starting checker %r for %s",
508
logger.info("Starting checker %r for %s",
353
509
command, self.name)
354
510
# We don't need to redirect stdout and stderr, since
355
511
# in normal mode, that is already done by daemon(),
358
514
self.checker = subprocess.Popen(command,
359
515
close_fds=True,
360
516
shell=True, cwd="/")
361
self.checker_callback_tag = gobject.child_watch_add\
362
(self.checker.pid,
363
self.checker_callback)
364
except OSError, error:
365
logger.error(u"Failed to start subprocess: %s",
517
self.checker_callback_tag = (gobject.child_watch_add
518
(self.checker.pid,
519
self.checker_callback,
520
data=command))
521
# The checker may have completed before the gobject
522
# watch was added. Check for this.
523
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
524
if pid:
525
gobject.source_remove(self.checker_callback_tag)
526
self.checker_callback(pid, status, command)
527
except OSError as error:
528
logger.error("Failed to start subprocess: %s",
366
529
error)
367
530
# Re-run this periodically if run by gobject.timeout_add
368
531
return True
532
369
533
def stop_checker(self):
370
534
"""Force the checker process, if any, to stop."""
371
535
if self.checker_callback_tag:
373
537
self.checker_callback_tag = None
374
538
if getattr(self, "checker", None) is None:
375
539
return
376
logger.debug(u"Stopping checker for %(name)s", vars(self))
540
logger.debug("Stopping checker for %(name)s", vars(self))
377
541
try:
378
542
os.kill(self.checker.pid, signal.SIGTERM)
379
#os.sleep(0.5)
543
#time.sleep(0.5)
380
544
#if self.checker.poll() is None:
381
545
# os.kill(self.checker.pid, signal.SIGKILL)
382
except OSError, error:
546
except OSError as error:
383
547
if error.errno != errno.ESRCH: # No such process
384
548
raise
385
549
self.checker = None
386
def still_valid(self):
387
"""Has the timeout not yet passed for this client?"""
388
now = datetime.datetime.now()
550
551
def dbus_service_property(dbus_interface, signature="v",
552
access="readwrite", byte_arrays=False):
553
"""Decorators for marking methods of a DBusObjectWithProperties to
554
become properties on the D-Bus.
555
556
The decorated method will be called with no arguments by "Get"
557
and with one argument by "Set".
558
559
The parameters, where they are supported, are the same as
560
dbus.service.method, except there is only "signature", since the
561
type from Get() and the type sent to Set() is the same.
562
"""
563
# Encoding deeply encoded byte arrays is not supported yet by the
564
# "Set" method, so we fail early here:
565
if byte_arrays and signature != "ay":
566
raise ValueError("Byte arrays not supported for non-'ay'"
567
" signature %r" % signature)
568
def decorator(func):
569
func._dbus_is_property = True
570
func._dbus_interface = dbus_interface
571
func._dbus_signature = signature
572
func._dbus_access = access
573
func._dbus_name = func.__name__
574
if func._dbus_name.endswith("_dbus_property"):
575
func._dbus_name = func._dbus_name[:-14]
576
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
577
return func
578
return decorator
579
580
581
class DBusPropertyException(dbus.exceptions.DBusException):
582
"""A base class for D-Bus property-related exceptions
583
"""
584
def __unicode__(self):
585
return unicode(str(self))
586
587
588
class DBusPropertyAccessException(DBusPropertyException):
589
"""A property's access permissions disallows an operation.
590
"""
591
pass
592
593
594
class DBusPropertyNotFound(DBusPropertyException):
595
"""An attempt was made to access a non-existing property.
596
"""
597
pass
598
599
600
class DBusObjectWithProperties(dbus.service.Object):
601
"""A D-Bus object with properties.
602
603
Classes inheriting from this can use the dbus_service_property
604
decorator to expose methods as D-Bus properties. It exposes the
605
standard Get(), Set(), and GetAll() methods on the D-Bus.
606
"""
607
608
@staticmethod
609
def _is_dbus_property(obj):
610
return getattr(obj, "_dbus_is_property", False)
611
612
def _get_all_dbus_properties(self):
613
"""Returns a generator of (name, attribute) pairs
614
"""
615
return ((prop._dbus_name, prop)
616
for name, prop in
617
inspect.getmembers(self, self._is_dbus_property))
618
619
def _get_dbus_property(self, interface_name, property_name):
620
"""Returns a bound method if one exists which is a D-Bus
621
property with the specified name and interface.
622
"""
623
for name in (property_name,
624
property_name + "_dbus_property"):
625
prop = getattr(self, name, None)
626
if (prop is None
627
or not self._is_dbus_property(prop)
628
or prop._dbus_name != property_name
629
or (interface_name and prop._dbus_interface
630
and interface_name != prop._dbus_interface)):
631
continue
632
return prop
633
# No such property
634
raise DBusPropertyNotFound(self.dbus_object_path + ":"
635
+ interface_name + "."
636
+ property_name)
637
638
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
639
out_signature="v")
640
def Get(self, interface_name, property_name):
641
"""Standard D-Bus property Get() method, see D-Bus standard.
642
"""
643
prop = self._get_dbus_property(interface_name, property_name)
644
if prop._dbus_access == "write":
645
raise DBusPropertyAccessException(property_name)
646
value = prop()
647
if not hasattr(value, "variant_level"):
648
return value
649
return type(value)(value, variant_level=value.variant_level+1)
650
651
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
652
def Set(self, interface_name, property_name, value):
653
"""Standard D-Bus property Set() method, see D-Bus standard.
654
"""
655
prop = self._get_dbus_property(interface_name, property_name)
656
if prop._dbus_access == "read":
657
raise DBusPropertyAccessException(property_name)
658
if prop._dbus_get_args_options["byte_arrays"]:
659
# The byte_arrays option is not supported yet on
660
# signatures other than "ay".
661
if prop._dbus_signature != "ay":
662
raise ValueError
663
value = dbus.ByteArray(''.join(unichr(byte)
664
for byte in value))
665
prop(value)
666
667
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
668
out_signature="a{sv}")
669
def GetAll(self, interface_name):
670
"""Standard D-Bus property GetAll() method, see D-Bus
671
standard.
672
673
Note: Will not include properties with access="write".
674
"""
675
all = {}
676
for name, prop in self._get_all_dbus_properties():
677
if (interface_name
678
and interface_name != prop._dbus_interface):
679
# Interface non-empty but did not match
680
continue
681
# Ignore write-only properties
682
if prop._dbus_access == "write":
683
continue
684
value = prop()
685
if not hasattr(value, "variant_level"):
686
all[name] = value
687
continue
688
all[name] = type(value)(value, variant_level=
689
value.variant_level+1)
690
return dbus.Dictionary(all, signature="sv")
691
692
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
693
out_signature="s",
694
path_keyword='object_path',
695
connection_keyword='connection')
696
def Introspect(self, object_path, connection):
697
"""Standard D-Bus method, overloaded to insert property tags.
698
"""
699
xmlstring = dbus.service.Object.Introspect(self, object_path,
700
connection)
701
try:
702
document = xml.dom.minidom.parseString(xmlstring)
703
def make_tag(document, name, prop):
704
e = document.createElement("property")
705
e.setAttribute("name", name)
706
e.setAttribute("type", prop._dbus_signature)
707
e.setAttribute("access", prop._dbus_access)
708
return e
709
for if_tag in document.getElementsByTagName("interface"):
710
for tag in (make_tag(document, name, prop)
711
for name, prop
712
in self._get_all_dbus_properties()
713
if prop._dbus_interface
714
== if_tag.getAttribute("name")):
715
if_tag.appendChild(tag)
716
# Add the names to the return values for the
717
# "org.freedesktop.DBus.Properties" methods
718
if (if_tag.getAttribute("name")
719
== "org.freedesktop.DBus.Properties"):
720
for cn in if_tag.getElementsByTagName("method"):
721
if cn.getAttribute("name") == "Get":
722
for arg in cn.getElementsByTagName("arg"):
723
if (arg.getAttribute("direction")
724
== "out"):
725
arg.setAttribute("name", "value")
726
elif cn.getAttribute("name") == "GetAll":
727
for arg in cn.getElementsByTagName("arg"):
728
if (arg.getAttribute("direction")
729
== "out"):
730
arg.setAttribute("name", "props")
731
xmlstring = document.toxml("utf-8")
732
document.unlink()
733
except (AttributeError, xml.dom.DOMException,
734
xml.parsers.expat.ExpatError) as error:
735
logger.error("Failed to override Introspection method",
736
error)
737
return xmlstring
738
739
740
class ClientDBus(Client, DBusObjectWithProperties):
741
"""A Client class using D-Bus
742
743
Attributes:
744
dbus_object_path: dbus.ObjectPath
745
bus: dbus.SystemBus()
746
"""
747
748
runtime_expansions = (Client.runtime_expansions
749
+ ("dbus_object_path",))
750
751
# dbus.service.Object doesn't use super(), so we can't either.
752
753
def __init__(self, bus = None, *args, **kwargs):
754
self._approvals_pending = 0
755
self.bus = bus
756
Client.__init__(self, *args, **kwargs)
757
# Only now, when this client is initialized, can it show up on
758
# the D-Bus
759
client_object_name = unicode(self.name).translate(
760
{ord("."): ord("_"),
761
ord("-"): ord("_")})
762
self.dbus_object_path = (dbus.ObjectPath
763
("/clients/" + client_object_name))
764
DBusObjectWithProperties.__init__(self, self.bus,
765
self.dbus_object_path)
766
767
def _get_approvals_pending(self):
768
return self._approvals_pending
769
def _set_approvals_pending(self, value):
770
old_value = self._approvals_pending
771
self._approvals_pending = value
772
bval = bool(value)
773
if (hasattr(self, "dbus_object_path")
774
and bval is not bool(old_value)):
775
dbus_bool = dbus.Boolean(bval, variant_level=1)
776
self.PropertyChanged(dbus.String("ApprovalPending"),
777
dbus_bool)
778
779
approvals_pending = property(_get_approvals_pending,
780
_set_approvals_pending)
781
del _get_approvals_pending, _set_approvals_pending
782
783
@staticmethod
784
def _datetime_to_dbus(dt, variant_level=0):
785
"""Convert a UTC datetime.datetime() to a D-Bus type."""
786
return dbus.String(dt.isoformat(),
787
variant_level=variant_level)
788
789
def enable(self):
790
oldstate = getattr(self, "enabled", False)
791
r = Client.enable(self)
792
if oldstate != self.enabled:
793
# Emit D-Bus signals
794
self.PropertyChanged(dbus.String("Enabled"),
795
dbus.Boolean(True, variant_level=1))
796
self.PropertyChanged(
797
dbus.String("LastEnabled"),
798
self._datetime_to_dbus(self.last_enabled,
799
variant_level=1))
800
return r
801
802
def disable(self, quiet = False):
803
oldstate = getattr(self, "enabled", False)
804
r = Client.disable(self, quiet=quiet)
805
if not quiet and oldstate != self.enabled:
806
# Emit D-Bus signal
807
self.PropertyChanged(dbus.String("Enabled"),
808
dbus.Boolean(False, variant_level=1))
809
return r
810
811
def __del__(self, *args, **kwargs):
812
try:
813
self.remove_from_connection()
814
except LookupError:
815
pass
816
if hasattr(DBusObjectWithProperties, "__del__"):
817
DBusObjectWithProperties.__del__(self, *args, **kwargs)
818
Client.__del__(self, *args, **kwargs)
819
820
def checker_callback(self, pid, condition, command,
821
*args, **kwargs):
822
self.checker_callback_tag = None
823
self.checker = None
824
# Emit D-Bus signal
825
self.PropertyChanged(dbus.String("CheckerRunning"),
826
dbus.Boolean(False, variant_level=1))
827
if os.WIFEXITED(condition):
828
exitstatus = os.WEXITSTATUS(condition)
829
# Emit D-Bus signal
830
self.CheckerCompleted(dbus.Int16(exitstatus),
831
dbus.Int64(condition),
832
dbus.String(command))
833
else:
834
# Emit D-Bus signal
835
self.CheckerCompleted(dbus.Int16(-1),
836
dbus.Int64(condition),
837
dbus.String(command))
838
839
return Client.checker_callback(self, pid, condition, command,
840
*args, **kwargs)
841
842
def checked_ok(self, *args, **kwargs):
843
Client.checked_ok(self, *args, **kwargs)
844
# Emit D-Bus signal
845
self.PropertyChanged(
846
dbus.String("LastCheckedOK"),
847
(self._datetime_to_dbus(self.last_checked_ok,
848
variant_level=1)))
849
850
def need_approval(self, *args, **kwargs):
851
r = Client.need_approval(self, *args, **kwargs)
852
# Emit D-Bus signal
853
self.PropertyChanged(
854
dbus.String("LastApprovalRequest"),
855
(self._datetime_to_dbus(self.last_approval_request,
856
variant_level=1)))
857
return r
858
859
def start_checker(self, *args, **kwargs):
860
old_checker = self.checker
861
if self.checker is not None:
862
old_checker_pid = self.checker.pid
863
else:
864
old_checker_pid = None
865
r = Client.start_checker(self, *args, **kwargs)
866
# Only if new checker process was started
867
if (self.checker is not None
868
and old_checker_pid != self.checker.pid):
869
# Emit D-Bus signal
870
self.CheckerStarted(self.current_checker_command)
871
self.PropertyChanged(
872
dbus.String("CheckerRunning"),
873
dbus.Boolean(True, variant_level=1))
874
return r
875
876
def stop_checker(self, *args, **kwargs):
877
old_checker = getattr(self, "checker", None)
878
r = Client.stop_checker(self, *args, **kwargs)
879
if (old_checker is not None
880
and getattr(self, "checker", None) is None):
881
self.PropertyChanged(dbus.String("CheckerRunning"),
882
dbus.Boolean(False, variant_level=1))
883
return r
884
885
def _reset_approved(self):
886
self._approved = None
887
return False
888
889
def approve(self, value=True):
890
self.send_changedstate()
891
self._approved = value
892
gobject.timeout_add(self._timedelta_to_milliseconds
893
(self.approval_duration),
894
self._reset_approved)
895
896
897
## D-Bus methods, signals & properties
898
_interface = "se.bsnet.fukt.Mandos.Client"
899
900
## Signals
901
902
# CheckerCompleted - signal
903
@dbus.service.signal(_interface, signature="nxs")
904
def CheckerCompleted(self, exitcode, waitstatus, command):
905
"D-Bus signal"
906
pass
907
908
# CheckerStarted - signal
909
@dbus.service.signal(_interface, signature="s")
910
def CheckerStarted(self, command):
911
"D-Bus signal"
912
pass
913
914
# PropertyChanged - signal
915
@dbus.service.signal(_interface, signature="sv")
916
def PropertyChanged(self, property, value):
917
"D-Bus signal"
918
pass
919
920
# GotSecret - signal
921
@dbus.service.signal(_interface)
922
def GotSecret(self):
923
"""D-Bus signal
924
Is sent after a successful transfer of secret from the Mandos
925
server to mandos-client
926
"""
927
pass
928
929
# Rejected - signal
930
@dbus.service.signal(_interface, signature="s")
931
def Rejected(self, reason):
932
"D-Bus signal"
933
pass
934
935
# NeedApproval - signal
936
@dbus.service.signal(_interface, signature="tb")
937
def NeedApproval(self, timeout, default):
938
"D-Bus signal"
939
return self.need_approval()
940
941
## Methods
942
943
# Approve - method
944
@dbus.service.method(_interface, in_signature="b")
945
def Approve(self, value):
946
self.approve(value)
947
948
# CheckedOK - method
949
@dbus.service.method(_interface)
950
def CheckedOK(self):
951
self.checked_ok()
952
953
# Enable - method
954
@dbus.service.method(_interface)
955
def Enable(self):
956
"D-Bus method"
957
self.enable()
958
959
# StartChecker - method
960
@dbus.service.method(_interface)
961
def StartChecker(self):
962
"D-Bus method"
963
self.start_checker()
964
965
# Disable - method
966
@dbus.service.method(_interface)
967
def Disable(self):
968
"D-Bus method"
969
self.disable()
970
971
# StopChecker - method
972
@dbus.service.method(_interface)
973
def StopChecker(self):
974
self.stop_checker()
975
976
## Properties
977
978
# ApprovalPending - property
979
@dbus_service_property(_interface, signature="b", access="read")
980
def ApprovalPending_dbus_property(self):
981
return dbus.Boolean(bool(self.approvals_pending))
982
983
# ApprovedByDefault - property
984
@dbus_service_property(_interface, signature="b",
985
access="readwrite")
986
def ApprovedByDefault_dbus_property(self, value=None):
987
if value is None: # get
988
return dbus.Boolean(self.approved_by_default)
989
self.approved_by_default = bool(value)
990
# Emit D-Bus signal
991
self.PropertyChanged(dbus.String("ApprovedByDefault"),
992
dbus.Boolean(value, variant_level=1))
993
994
# ApprovalDelay - property
995
@dbus_service_property(_interface, signature="t",
996
access="readwrite")
997
def ApprovalDelay_dbus_property(self, value=None):
998
if value is None: # get
999
return dbus.UInt64(self.approval_delay_milliseconds())
1000
self.approval_delay = datetime.timedelta(0, 0, 0, value)
1001
# Emit D-Bus signal
1002
self.PropertyChanged(dbus.String("ApprovalDelay"),
1003
dbus.UInt64(value, variant_level=1))
1004
1005
# ApprovalDuration - property
1006
@dbus_service_property(_interface, signature="t",
1007
access="readwrite")
1008
def ApprovalDuration_dbus_property(self, value=None):
1009
if value is None: # get
1010
return dbus.UInt64(self._timedelta_to_milliseconds(
1011
self.approval_duration))
1012
self.approval_duration = datetime.timedelta(0, 0, 0, value)
1013
# Emit D-Bus signal
1014
self.PropertyChanged(dbus.String("ApprovalDuration"),
1015
dbus.UInt64(value, variant_level=1))
1016
1017
# Name - property
1018
@dbus_service_property(_interface, signature="s", access="read")
1019
def Name_dbus_property(self):
1020
return dbus.String(self.name)
1021
1022
# Fingerprint - property
1023
@dbus_service_property(_interface, signature="s", access="read")
1024
def Fingerprint_dbus_property(self):
1025
return dbus.String(self.fingerprint)
1026
1027
# Host - property
1028
@dbus_service_property(_interface, signature="s",
1029
access="readwrite")
1030
def Host_dbus_property(self, value=None):
1031
if value is None: # get
1032
return dbus.String(self.host)
1033
self.host = value
1034
# Emit D-Bus signal
1035
self.PropertyChanged(dbus.String("Host"),
1036
dbus.String(value, variant_level=1))
1037
1038
# Created - property
1039
@dbus_service_property(_interface, signature="s", access="read")
1040
def Created_dbus_property(self):
1041
return dbus.String(self._datetime_to_dbus(self.created))
1042
1043
# LastEnabled - property
1044
@dbus_service_property(_interface, signature="s", access="read")
1045
def LastEnabled_dbus_property(self):
1046
if self.last_enabled is None:
1047
return dbus.String("")
1048
return dbus.String(self._datetime_to_dbus(self.last_enabled))
1049
1050
# Enabled - property
1051
@dbus_service_property(_interface, signature="b",
1052
access="readwrite")
1053
def Enabled_dbus_property(self, value=None):
1054
if value is None: # get
1055
return dbus.Boolean(self.enabled)
1056
if value:
1057
self.enable()
1058
else:
1059
self.disable()
1060
1061
# LastCheckedOK - property
1062
@dbus_service_property(_interface, signature="s",
1063
access="readwrite")
1064
def LastCheckedOK_dbus_property(self, value=None):
1065
if value is not None:
1066
self.checked_ok()
1067
return
389
1068
if self.last_checked_ok is None:
390
return now < (self.created + self.timeout)
391
else:
392
return now < (self.last_checked_ok + self.timeout)
393
394
395
def peer_certificate(session):
396
"Return the peer's OpenPGP certificate as a bytestring"
397
# If not an OpenPGP certificate...
398
if gnutls.library.functions.gnutls_certificate_type_get\
399
(session._c_object) \
400
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
401
# ...do the normal thing
402
return session.peer_certificate
403
list_size = ctypes.c_uint()
404
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
405
(session._c_object, ctypes.byref(list_size))
406
if list_size.value == 0:
407
return None
408
cert = cert_list[0]
409
return ctypes.string_at(cert.data, cert.size)
410
411
412
def fingerprint(openpgp):
413
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
414
# New GnuTLS "datum" with the OpenPGP public key
415
datum = gnutls.library.types.gnutls_datum_t\
416
(ctypes.cast(ctypes.c_char_p(openpgp),
417
ctypes.POINTER(ctypes.c_ubyte)),
418
ctypes.c_uint(len(openpgp)))
419
# New empty GnuTLS certificate
420
crt = gnutls.library.types.gnutls_openpgp_crt_t()
421
gnutls.library.functions.gnutls_openpgp_crt_init\
422
(ctypes.byref(crt))
423
# Import the OpenPGP public key into the certificate
424
gnutls.library.functions.gnutls_openpgp_crt_import\
425
(crt, ctypes.byref(datum),
426
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
427
# Verify the self signature in the key
428
crtverify = ctypes.c_uint()
429
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
430
(crt, 0, ctypes.byref(crtverify))
431
if crtverify.value != 0:
432
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
433
raise gnutls.errors.CertificateSecurityError("Verify failed")
434
# New buffer for the fingerprint
435
buf = ctypes.create_string_buffer(20)
436
buf_len = ctypes.c_size_t()
437
# Get the fingerprint from the certificate into the buffer
438
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
439
(crt, ctypes.byref(buf), ctypes.byref(buf_len))
440
# Deinit the certificate
441
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
442
# Convert the buffer to a Python bytestring
443
fpr = ctypes.string_at(buf, buf_len.value)
444
# Convert the bytestring to hexadecimal notation
445
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
446
return hex_fpr
447
448
449
class TCP_handler(SocketServer.BaseRequestHandler, object):
450
"""A TCP request handler class.
451
Instantiated by IPv6_TCPServer for each request to handle it.
1069
return dbus.String("")
1070
return dbus.String(self._datetime_to_dbus(self
1071
.last_checked_ok))
1072
1073
# LastApprovalRequest - property
1074
@dbus_service_property(_interface, signature="s", access="read")
1075
def LastApprovalRequest_dbus_property(self):
1076
if self.last_approval_request is None:
1077
return dbus.String("")
1078
return dbus.String(self.
1079
_datetime_to_dbus(self
1080
.last_approval_request))
1081
1082
# Timeout - property
1083
@dbus_service_property(_interface, signature="t",
1084
access="readwrite")
1085
def Timeout_dbus_property(self, value=None):
1086
if value is None: # get
1087
return dbus.UInt64(self.timeout_milliseconds())
1088
self.timeout = datetime.timedelta(0, 0, 0, value)
1089
# Emit D-Bus signal
1090
self.PropertyChanged(dbus.String("Timeout"),
1091
dbus.UInt64(value, variant_level=1))
1092
if getattr(self, "disable_initiator_tag", None) is None:
1093
return
1094
# Reschedule timeout
1095
gobject.source_remove(self.disable_initiator_tag)
1096
self.disable_initiator_tag = None
1097
time_to_die = (self.
1098
_timedelta_to_milliseconds((self
1099
.last_checked_ok
1100
+ self.timeout)
1101
- datetime.datetime
1102
.utcnow()))
1103
if time_to_die <= 0:
1104
# The timeout has passed
1105
self.disable()
1106
else:
1107
self.disable_initiator_tag = (gobject.timeout_add
1108
(time_to_die, self.disable))
1109
1110
# Interval - property
1111
@dbus_service_property(_interface, signature="t",
1112
access="readwrite")
1113
def Interval_dbus_property(self, value=None):
1114
if value is None: # get
1115
return dbus.UInt64(self.interval_milliseconds())
1116
self.interval = datetime.timedelta(0, 0, 0, value)
1117
# Emit D-Bus signal
1118
self.PropertyChanged(dbus.String("Interval"),
1119
dbus.UInt64(value, variant_level=1))
1120
if getattr(self, "checker_initiator_tag", None) is None:
1121
return
1122
# Reschedule checker run
1123
gobject.source_remove(self.checker_initiator_tag)
1124
self.checker_initiator_tag = (gobject.timeout_add
1125
(value, self.start_checker))
1126
self.start_checker() # Start one now, too
1127
1128
# Checker - property
1129
@dbus_service_property(_interface, signature="s",
1130
access="readwrite")
1131
def Checker_dbus_property(self, value=None):
1132
if value is None: # get
1133
return dbus.String(self.checker_command)
1134
self.checker_command = value
1135
# Emit D-Bus signal
1136
self.PropertyChanged(dbus.String("Checker"),
1137
dbus.String(self.checker_command,
1138
variant_level=1))
1139
1140
# CheckerRunning - property
1141
@dbus_service_property(_interface, signature="b",
1142
access="readwrite")
1143
def CheckerRunning_dbus_property(self, value=None):
1144
if value is None: # get
1145
return dbus.Boolean(self.checker is not None)
1146
if value:
1147
self.start_checker()
1148
else:
1149
self.stop_checker()
1150
1151
# ObjectPath - property
1152
@dbus_service_property(_interface, signature="o", access="read")
1153
def ObjectPath_dbus_property(self):
1154
return self.dbus_object_path # is already a dbus.ObjectPath
1155
1156
# Secret = property
1157
@dbus_service_property(_interface, signature="ay",
1158
access="write", byte_arrays=True)
1159
def Secret_dbus_property(self, value):
1160
self.secret = str(value)
1161
1162
del _interface
1163
1164
1165
class ProxyClient(object):
1166
def __init__(self, child_pipe, fpr, address):
1167
self._pipe = child_pipe
1168
self._pipe.send(('init', fpr, address))
1169
if not self._pipe.recv():
1170
raise KeyError()
1171
1172
def __getattribute__(self, name):
1173
if(name == '_pipe'):
1174
return super(ProxyClient, self).__getattribute__(name)
1175
self._pipe.send(('getattr', name))
1176
data = self._pipe.recv()
1177
if data[0] == 'data':
1178
return data[1]
1179
if data[0] == 'function':
1180
def func(*args, **kwargs):
1181
self._pipe.send(('funcall', name, args, kwargs))
1182
return self._pipe.recv()[1]
1183
return func
1184
1185
def __setattr__(self, name, value):
1186
if(name == '_pipe'):
1187
return super(ProxyClient, self).__setattr__(name, value)
1188
self._pipe.send(('setattr', name, value))
1189
1190
1191
class ClientHandler(socketserver.BaseRequestHandler, object):
1192
"""A class to handle client connections.
1193
1194
Instantiated once for each connection to handle it.
452
1195
Note: This will run in its own forked process."""
453
1196
454
1197
def handle(self):
455
logger.info(u"TCP connection from: %s",
456
unicode(self.client_address))
457
session = gnutls.connection.ClientSession\
458
(self.request, gnutls.connection.X509Credentials())
459
460
line = self.request.makefile().readline()
461
logger.debug(u"Protocol version: %r", line)
462
try:
463
if int(line.strip().split()[0]) > 1:
464
raise RuntimeError
465
except (ValueError, IndexError, RuntimeError), error:
466
logger.error(u"Unknown protocol version: %s", error)
467
return
468
469
# Note: gnutls.connection.X509Credentials is really a generic
470
# GnuTLS certificate credentials object so long as no X.509
471
# keys are added to it. Therefore, we can use it here despite
472
# using OpenPGP certificates.
473
474
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
475
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
476
# "+DHE-DSS"))
477
# Use a fallback default, since this MUST be set.
478
priority = self.server.settings.get("priority", "NORMAL")
479
gnutls.library.functions.gnutls_priority_set_direct\
480
(session._c_object, priority, None)
481
482
try:
483
session.handshake()
484
except gnutls.errors.GNUTLSError, error:
485
logger.warning(u"Handshake failed: %s", error)
486
# Do not run session.bye() here: the session is not
487
# established. Just abandon the request.
488
return
489
try:
490
fpr = fingerprint(peer_certificate(session))
491
except (TypeError, gnutls.errors.GNUTLSError), error:
492
logger.warning(u"Bad certificate: %s", error)
493
session.bye()
494
return
495
logger.debug(u"Fingerprint: %s", fpr)
496
client = None
497
for c in self.server.clients:
498
if c.fingerprint == fpr:
499
client = c
500
break
501
if not client:
502
logger.warning(u"Client not found for fingerprint: %s",
503
fpr)
504
session.bye()
505
return
506
# Have to check if client.still_valid(), since it is possible
507
# that the client timed out while establishing the GnuTLS
508
# session.
509
if not client.still_valid():
510
logger.warning(u"Client %(name)s is invalid",
511
vars(client))
512
session.bye()
513
return
514
## This won't work here, since we're in a fork.
515
# client.bump_timeout()
516
sent_size = 0
517
while sent_size < len(client.secret):
518
sent = session.send(client.secret[sent_size:])
519
logger.debug(u"Sent: %d, remaining: %d",
520
sent, len(client.secret)
521
- (sent_size + sent))
522
sent_size += sent
523
session.bye()
524
525
526
class IPv6_TCPServer(SocketServer.ForkingMixIn,
527
SocketServer.TCPServer, object):
528
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1198
with contextlib.closing(self.server.child_pipe) as child_pipe:
1199
logger.info("TCP connection from: %s",
1200
unicode(self.client_address))
1201
logger.debug("Pipe FD: %d",
1202
self.server.child_pipe.fileno())
1203
1204
session = (gnutls.connection
1205
.ClientSession(self.request,
1206
gnutls.connection
1207
.X509Credentials()))
1208
1209
# Note: gnutls.connection.X509Credentials is really a
1210
# generic GnuTLS certificate credentials object so long as
1211
# no X.509 keys are added to it. Therefore, we can use it
1212
# here despite using OpenPGP certificates.
1213
1214
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
1215
# "+AES-256-CBC", "+SHA1",
1216
# "+COMP-NULL", "+CTYPE-OPENPGP",
1217
# "+DHE-DSS"))
1218
# Use a fallback default, since this MUST be set.
1219
priority = self.server.gnutls_priority
1220
if priority is None:
1221
priority = "NORMAL"
1222
(gnutls.library.functions
1223
.gnutls_priority_set_direct(session._c_object,
1224
priority, None))
1225
1226
# Start communication using the Mandos protocol
1227
# Get protocol number
1228
line = self.request.makefile().readline()
1229
logger.debug("Protocol version: %r", line)
1230
try:
1231
if int(line.strip().split()[0]) > 1:
1232
raise RuntimeError
1233
except (ValueError, IndexError, RuntimeError) as error:
1234
logger.error("Unknown protocol version: %s", error)
1235
return
1236
1237
# Start GnuTLS connection
1238
try:
1239
session.handshake()
1240
except gnutls.errors.GNUTLSError as error:
1241
logger.warning("Handshake failed: %s", error)
1242
# Do not run session.bye() here: the session is not
1243
# established. Just abandon the request.
1244
return
1245
logger.debug("Handshake succeeded")
1246
1247
approval_required = False
1248
try:
1249
try:
1250
fpr = self.fingerprint(self.peer_certificate
1251
(session))
1252
except (TypeError,
1253
gnutls.errors.GNUTLSError) as error:
1254
logger.warning("Bad certificate: %s", error)
1255
return
1256
logger.debug("Fingerprint: %s", fpr)
1257
1258
try:
1259
client = ProxyClient(child_pipe, fpr,
1260
self.client_address)
1261
except KeyError:
1262
return
1263
1264
if client.approval_delay:
1265
delay = client.approval_delay
1266
client.approvals_pending += 1
1267
approval_required = True
1268
1269
while True:
1270
if not client.enabled:
1271
logger.info("Client %s is disabled",
1272
client.name)
1273
if self.server.use_dbus:
1274
# Emit D-Bus signal
1275
client.Rejected("Disabled")
1276
return
1277
1278
if client._approved or not client.approval_delay:
1279
#We are approved or approval is disabled
1280
break
1281
elif client._approved is None:
1282
logger.info("Client %s needs approval",
1283
client.name)
1284
if self.server.use_dbus:
1285
# Emit D-Bus signal
1286
client.NeedApproval(
1287
client.approval_delay_milliseconds(),
1288
client.approved_by_default)
1289
else:
1290
logger.warning("Client %s was not approved",
1291
client.name)
1292
if self.server.use_dbus:
1293
# Emit D-Bus signal
1294
client.Rejected("Denied")
1295
return
1296
1297
#wait until timeout or approved
1298
#x = float(client._timedelta_to_milliseconds(delay))
1299
time = datetime.datetime.now()
1300
client.changedstate.acquire()
1301
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1302
client.changedstate.release()
1303
time2 = datetime.datetime.now()
1304
if (time2 - time) >= delay:
1305
if not client.approved_by_default:
1306
logger.warning("Client %s timed out while"
1307
" waiting for approval",
1308
client.name)
1309
if self.server.use_dbus:
1310
# Emit D-Bus signal
1311
client.Rejected("Approval timed out")
1312
return
1313
else:
1314
break
1315
else:
1316
delay -= time2 - time
1317
1318
sent_size = 0
1319
while sent_size < len(client.secret):
1320
try:
1321
sent = session.send(client.secret[sent_size:])
1322
except gnutls.errors.GNUTLSError as error:
1323
logger.warning("gnutls send failed")
1324
return
1325
logger.debug("Sent: %d, remaining: %d",
1326
sent, len(client.secret)
1327
- (sent_size + sent))
1328
sent_size += sent
1329
1330
logger.info("Sending secret to %s", client.name)
1331
# bump the timeout as if seen
1332
client.checked_ok()
1333
if self.server.use_dbus:
1334
# Emit D-Bus signal
1335
client.GotSecret()
1336
1337
finally:
1338
if approval_required:
1339
client.approvals_pending -= 1
1340
try:
1341
session.bye()
1342
except gnutls.errors.GNUTLSError as error:
1343
logger.warning("GnuTLS bye failed")
1344
1345
@staticmethod
1346
def peer_certificate(session):
1347
"Return the peer's OpenPGP certificate as a bytestring"
1348
# If not an OpenPGP certificate...
1349
if (gnutls.library.functions
1350
.gnutls_certificate_type_get(session._c_object)
1351
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1352
# ...do the normal thing
1353
return session.peer_certificate
1354
list_size = ctypes.c_uint(1)
1355
cert_list = (gnutls.library.functions
1356
.gnutls_certificate_get_peers
1357
(session._c_object, ctypes.byref(list_size)))
1358
if not bool(cert_list) and list_size.value != 0:
1359
raise gnutls.errors.GNUTLSError("error getting peer"
1360
" certificate")
1361
if list_size.value == 0:
1362
return None
1363
cert = cert_list[0]
1364
return ctypes.string_at(cert.data, cert.size)
1365
1366
@staticmethod
1367
def fingerprint(openpgp):
1368
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1369
# New GnuTLS "datum" with the OpenPGP public key
1370
datum = (gnutls.library.types
1371
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1372
ctypes.POINTER
1373
(ctypes.c_ubyte)),
1374
ctypes.c_uint(len(openpgp))))
1375
# New empty GnuTLS certificate
1376
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1377
(gnutls.library.functions
1378
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1379
# Import the OpenPGP public key into the certificate
1380
(gnutls.library.functions
1381
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1382
gnutls.library.constants
1383
.GNUTLS_OPENPGP_FMT_RAW))
1384
# Verify the self signature in the key
1385
crtverify = ctypes.c_uint()
1386
(gnutls.library.functions
1387
.gnutls_openpgp_crt_verify_self(crt, 0,
1388
ctypes.byref(crtverify)))
1389
if crtverify.value != 0:
1390
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1391
raise (gnutls.errors.CertificateSecurityError
1392
("Verify failed"))
1393
# New buffer for the fingerprint
1394
buf = ctypes.create_string_buffer(20)
1395
buf_len = ctypes.c_size_t()
1396
# Get the fingerprint from the certificate into the buffer
1397
(gnutls.library.functions
1398
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1399
ctypes.byref(buf_len)))
1400
# Deinit the certificate
1401
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1402
# Convert the buffer to a Python bytestring
1403
fpr = ctypes.string_at(buf, buf_len.value)
1404
# Convert the bytestring to hexadecimal notation
1405
hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1406
return hex_fpr
1407
1408
1409
class MultiprocessingMixIn(object):
1410
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1411
def sub_process_main(self, request, address):
1412
try:
1413
self.finish_request(request, address)
1414
except:
1415
self.handle_error(request, address)
1416
self.close_request(request)
1417
1418
def process_request(self, request, address):
1419
"""Start a new process to process the request."""
1420
multiprocessing.Process(target = self.sub_process_main,
1421
args = (request, address)).start()
1422
1423
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1424
""" adds a pipe to the MixIn """
1425
def process_request(self, request, client_address):
1426
"""Overrides and wraps the original process_request().
1427
1428
This function creates a new pipe in self.pipe
1429
"""
1430
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1431
1432
super(MultiprocessingMixInWithPipe,
1433
self).process_request(request, client_address)
1434
self.child_pipe.close()
1435
self.add_pipe(parent_pipe)
1436
1437
def add_pipe(self, parent_pipe):
1438
"""Dummy function; override as necessary"""
1439
raise NotImplementedError
1440
1441
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1442
socketserver.TCPServer, object):
1443
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1444
529
1445
Attributes:
530
settings: Server settings
531
clients: Set() of Client objects
532
1446
enabled: Boolean; whether this server is activated yet
1447
interface: None or a network interface name (string)
1448
use_ipv6: Boolean; to use IPv6 or not
533
1449
"""
534
address_family = socket.AF_INET6
535
def __init__(self, *args, **kwargs):
536
if "settings" in kwargs:
537
self.settings = kwargs["settings"]
538
del kwargs["settings"]
539
if "clients" in kwargs:
540
self.clients = kwargs["clients"]
541
del kwargs["clients"]
542
self.enabled = False
543
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
1450
def __init__(self, server_address, RequestHandlerClass,
1451
interface=None, use_ipv6=True):
1452
self.interface = interface
1453
if use_ipv6:
1454
self.address_family = socket.AF_INET6
1455
socketserver.TCPServer.__init__(self, server_address,
1456
RequestHandlerClass)
544
1457
def server_bind(self):
545
1458
"""This overrides the normal server_bind() function
546
1459
to bind to an interface if one was specified, and also NOT to
547
1460
bind to an address or port if they were not specified."""
548
if self.settings["interface"]:
549
# 25 is from /usr/include/asm-i486/socket.h
550
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
551
try:
552
self.socket.setsockopt(socket.SOL_SOCKET,
553
SO_BINDTODEVICE,
554
self.settings["interface"])
555
except socket.error, error:
556
if error[0] == errno.EPERM:
557
logger.error(u"No permission to"
558
u" bind to interface %s",
559
self.settings["interface"])
560
else:
561
raise error
1461
if self.interface is not None:
1462
if SO_BINDTODEVICE is None:
1463
logger.error("SO_BINDTODEVICE does not exist;"
1464
" cannot bind to interface %s",
1465
self.interface)
1466
else:
1467
try:
1468
self.socket.setsockopt(socket.SOL_SOCKET,
1469
SO_BINDTODEVICE,
1470
str(self.interface
1471
+ '\0'))
1472
except socket.error as error:
1473
if error[0] == errno.EPERM:
1474
logger.error("No permission to"
1475
" bind to interface %s",
1476
self.interface)
1477
elif error[0] == errno.ENOPROTOOPT:
1478
logger.error("SO_BINDTODEVICE not available;"
1479
" cannot bind to interface %s",
1480
self.interface)
1481
else:
1482
raise
562
1483
# Only bind(2) the socket if we really need to.
563
1484
if self.server_address[0] or self.server_address[1]:
564
1485
if not self.server_address[0]:
565
in6addr_any = "::"
566
self.server_address = (in6addr_any,
1486
if self.address_family == socket.AF_INET6:
1487
any_address = "::" # in6addr_any
1488
else:
1489
any_address = socket.INADDR_ANY
1490
self.server_address = (any_address,
567
1491
self.server_address[1])
568
1492
elif not self.server_address[1]:
569
1493
self.server_address = (self.server_address[0],
570
1494
0)
571
# if self.settings["interface"]:
1495
# if self.interface:
572
1496
# self.server_address = (self.server_address[0],
573
1497
# 0, # port
574
1498
# 0, # flowinfo
575
1499
# if_nametoindex
576
# (self.settings
577
# ["interface"]))
578
return super(IPv6_TCPServer, self).server_bind()
1500
# (self.interface))
1501
return socketserver.TCPServer.server_bind(self)
1502
1503
1504
class MandosServer(IPv6_TCPServer):
1505
"""Mandos server.
1506
1507
Attributes:
1508
clients: set of Client objects
1509
gnutls_priority GnuTLS priority string
1510
use_dbus: Boolean; to emit D-Bus signals or not
1511
1512
Assumes a gobject.MainLoop event loop.
1513
"""
1514
def __init__(self, server_address, RequestHandlerClass,
1515
interface=None, use_ipv6=True, clients=None,
1516
gnutls_priority=None, use_dbus=True):
1517
self.enabled = False
1518
self.clients = clients
1519
if self.clients is None:
1520
self.clients = set()
1521
self.use_dbus = use_dbus
1522
self.gnutls_priority = gnutls_priority
1523
IPv6_TCPServer.__init__(self, server_address,
1524
RequestHandlerClass,
1525
interface = interface,
1526
use_ipv6 = use_ipv6)
579
1527
def server_activate(self):
580
1528
if self.enabled:
581
return super(IPv6_TCPServer, self).server_activate()
1529
return socketserver.TCPServer.server_activate(self)
582
1530
def enable(self):
583
1531
self.enabled = True
1532
def add_pipe(self, parent_pipe):
1533
# Call "handle_ipc" for both data and EOF events
1534
gobject.io_add_watch(parent_pipe.fileno(),
1535
gobject.IO_IN | gobject.IO_HUP,
1536
functools.partial(self.handle_ipc,
1537
parent_pipe = parent_pipe))
1538
1539
def handle_ipc(self, source, condition, parent_pipe=None,
1540
client_object=None):
1541
condition_names = {
1542
gobject.IO_IN: "IN", # There is data to read.
1543
gobject.IO_OUT: "OUT", # Data can be written (without
1544
# blocking).
1545
gobject.IO_PRI: "PRI", # There is urgent data to read.
1546
gobject.IO_ERR: "ERR", # Error condition.
1547
gobject.IO_HUP: "HUP" # Hung up (the connection has been
1548
# broken, usually for pipes and
1549
# sockets).
1550
}
1551
conditions_string = ' | '.join(name
1552
for cond, name in
1553
condition_names.iteritems()
1554
if cond & condition)
1555
# error or the other end of multiprocessing.Pipe has closed
1556
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1557
return False
1558
1559
# Read a request from the child
1560
request = parent_pipe.recv()
1561
command = request[0]
1562
1563
if command == 'init':
1564
fpr = request[1]
1565
address = request[2]
1566
1567
for c in self.clients:
1568
if c.fingerprint == fpr:
1569
client = c
1570
break
1571
else:
1572
logger.info("Client not found for fingerprint: %s, ad"
1573
"dress: %s", fpr, address)
1574
if self.use_dbus:
1575
# Emit D-Bus signal
1576
mandos_dbus_service.ClientNotFound(fpr, address[0])
1577
parent_pipe.send(False)
1578
return False
1579
1580
gobject.io_add_watch(parent_pipe.fileno(),
1581
gobject.IO_IN | gobject.IO_HUP,
1582
functools.partial(self.handle_ipc,
1583
parent_pipe = parent_pipe,
1584
client_object = client))
1585
parent_pipe.send(True)
1586
# remove the old hook in favor of the new above hook on same fileno
1587
return False
1588
if command == 'funcall':
1589
funcname = request[1]
1590
args = request[2]
1591
kwargs = request[3]
1592
1593
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1594
1595
if command == 'getattr':
1596
attrname = request[1]
1597
if callable(client_object.__getattribute__(attrname)):
1598
parent_pipe.send(('function',))
1599
else:
1600
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1601
1602
if command == 'setattr':
1603
attrname = request[1]
1604
value = request[2]
1605
setattr(client_object, attrname, value)
1606
1607
return True
584
1608
585
1609
586
1610
def string_to_delta(interval):
587
1611
"""Parse a string and return a datetime.timedelta
588
1612
589
1613
>>> string_to_delta('7d')
590
1614
datetime.timedelta(7)
591
1615
>>> string_to_delta('60s')
594
1618
datetime.timedelta(0, 3600)
595
1619
>>> string_to_delta('24h')
596
1620
datetime.timedelta(1)
597
>>> string_to_delta(u'1w')
1621
>>> string_to_delta('1w')
598
1622
datetime.timedelta(7)
599
1623
>>> string_to_delta('5m 30s')
600
1624
datetime.timedelta(0, 330)
604
1628
try:
605
1629
suffix = unicode(s[-1])
606
1630
value = int(s[:-1])
607
if suffix == u"d":
1631
if suffix == "d":
608
1632
delta = datetime.timedelta(value)
609
elif suffix == u"s":
1633
elif suffix == "s":
610
1634
delta = datetime.timedelta(0, value)
611
elif suffix == u"m":
1635
elif suffix == "m":
612
1636
delta = datetime.timedelta(0, 0, 0, 0, value)
613
elif suffix == u"h":
1637
elif suffix == "h":
614
1638
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
615
elif suffix == u"w":
1639
elif suffix == "w":
616
1640
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
617
1641
else:
618
raise ValueError
619
except (ValueError, IndexError):
620
raise ValueError
1642
raise ValueError("Unknown suffix %r" % suffix)
1643
except (ValueError, IndexError) as e:
1644
raise ValueError(*(e.args))
621
1645
timevalue += delta
622
1646
return timevalue
623
1647
624
1648
625
def server_state_changed(state):
626
"""Derived from the Avahi example code"""
627
if state == avahi.SERVER_COLLISION:
628
logger.error(u"Zeroconf server name collision")
629
service.remove()
630
elif state == avahi.SERVER_RUNNING:
631
service.add()
632
633
634
def entry_group_state_changed(state, error):
635
"""Derived from the Avahi example code"""
636
logger.debug(u"Avahi state change: %i", state)
637
638
if state == avahi.ENTRY_GROUP_ESTABLISHED:
639
logger.debug(u"Zeroconf service established.")
640
elif state == avahi.ENTRY_GROUP_COLLISION:
641
logger.warning(u"Zeroconf service name collision.")
642
service.rename()
643
elif state == avahi.ENTRY_GROUP_FAILURE:
644
logger.critical(u"Avahi: Error in group state changed %s",
645
unicode(error))
646
raise AvahiGroupError("State changed: %s", str(error))
647
648
1649
def if_nametoindex(interface):
649
"""Call the C function if_nametoindex(), or equivalent"""
1650
"""Call the C function if_nametoindex(), or equivalent
1651
1652
Note: This function cannot accept a unicode string."""
650
1653
global if_nametoindex
651
1654
try:
652
if_nametoindex = ctypes.cdll.LoadLibrary\
653
(ctypes.util.find_library("c")).if_nametoindex
1655
if_nametoindex = (ctypes.cdll.LoadLibrary
1656
(ctypes.util.find_library("c"))
1657
.if_nametoindex)
654
1658
except (OSError, AttributeError):
655
if "struct" not in sys.modules:
656
import struct
657
if "fcntl" not in sys.modules:
658
import fcntl
1659
logger.warning("Doing if_nametoindex the hard way")
659
1660
def if_nametoindex(interface):
660
1661
"Get an interface index the hard way, i.e. using fcntl()"
661
1662
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
662
with closing(socket.socket()) as s:
1663
with contextlib.closing(socket.socket()) as s:
663
1664
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
664
struct.pack("16s16x", interface))
665
interface_index = struct.unpack("I", ifreq[16:20])[0]
1665
struct.pack(str("16s16x"),
1666
interface))
1667
interface_index = struct.unpack(str("I"),
1668
ifreq[16:20])[0]
666
1669
return interface_index
667
1670
return if_nametoindex(interface)
668
1671
669
1672
670
1673
def daemon(nochdir = False, noclose = False):
671
1674
"""See daemon(3). Standard BSD Unix function.
1675
672
1676
This should really exist as os.daemon, but it doesn't (yet)."""
673
1677
if os.fork():
674
1678
sys.exit()
682
1686
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
683
1687
if not stat.S_ISCHR(os.fstat(null).st_mode):
684
1688
raise OSError(errno.ENODEV,
685
"/dev/null not a character device")
1689
"%s not a character device"
1690
% os.path.devnull)
686
1691
os.dup2(null, sys.stdin.fileno())
687
1692
os.dup2(null, sys.stdout.fileno())
688
1693
os.dup2(null, sys.stderr.fileno())
691
1696
692
1697
693
1698
def main():
694
parser = OptionParser(version = "%%prog %s" % version)
695
parser.add_option("-i", "--interface", type="string",
696
metavar="IF", help="Bind to interface IF")
697
parser.add_option("-a", "--address", type="string",
698
help="Address to listen for requests on")
699
parser.add_option("-p", "--port", type="int",
700
help="Port number to receive requests on")
701
parser.add_option("--check", action="store_true", default=False,
702
help="Run self-test")
703
parser.add_option("--debug", action="store_true",
704
help="Debug mode; run in foreground and log to"
705
" terminal")
706
parser.add_option("--priority", type="string", help="GnuTLS"
707
" priority string (see GnuTLS documentation)")
708
parser.add_option("--servicename", type="string", metavar="NAME",
709
help="Zeroconf service name")
710
parser.add_option("--configdir", type="string",
711
default="/etc/mandos", metavar="DIR",
712
help="Directory to search for configuration"
713
" files")
714
options = parser.parse_args()[0]
1699
1700
##################################################################
1701
# Parsing of options, both command line and config file
1702
1703
parser = argparse.ArgumentParser()
1704
parser.add_argument("-v", "--version", action="version",
1705
version = "%%(prog)s %s" % version,
1706
help="show version number and exit")
1707
parser.add_argument("-i", "--interface", metavar="IF",
1708
help="Bind to interface IF")
1709
parser.add_argument("-a", "--address",
1710
help="Address to listen for requests on")
1711
parser.add_argument("-p", "--port", type=int,
1712
help="Port number to receive requests on")
1713
parser.add_argument("--check", action="store_true",
1714
help="Run self-test")
1715
parser.add_argument("--debug", action="store_true",
1716
help="Debug mode; run in foreground and log"
1717
" to terminal")
1718
parser.add_argument("--debuglevel", metavar="LEVEL",
1719
help="Debug level for stdout output")
1720
parser.add_argument("--priority", help="GnuTLS"
1721
" priority string (see GnuTLS documentation)")
1722
parser.add_argument("--servicename",
1723
metavar="NAME", help="Zeroconf service name")
1724
parser.add_argument("--configdir",
1725
default="/etc/mandos", metavar="DIR",
1726
help="Directory to search for configuration"
1727
" files")
1728
parser.add_argument("--no-dbus", action="store_false",
1729
dest="use_dbus", help="Do not provide D-Bus"
1730
" system bus interface")
1731
parser.add_argument("--no-ipv6", action="store_false",
1732
dest="use_ipv6", help="Do not use IPv6")
1733
options = parser.parse_args()
715
1734
716
1735
if options.check:
717
1736
import doctest
726
1745
"priority":
727
1746
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
728
1747
"servicename": "Mandos",
1748
"use_dbus": "True",
1749
"use_ipv6": "True",
1750
"debuglevel": "",
729
1751
}
730
1752
731
1753
# Parse config file for server-global settings
732
server_config = ConfigParser.SafeConfigParser(server_defaults)
1754
server_config = configparser.SafeConfigParser(server_defaults)
733
1755
del server_defaults
734
server_config.read(os.path.join(options.configdir, "mandos.conf"))
1756
server_config.read(os.path.join(options.configdir,
1757
"mandos.conf"))
735
1758
# Convert the SafeConfigParser object to a dict
736
1759
server_settings = server_config.defaults()
737
# Use getboolean on the boolean config option
738
server_settings["debug"] = server_config.getboolean\
739
("DEFAULT", "debug")
1760
# Use the appropriate methods on the non-string config options
1761
for option in ("debug", "use_dbus", "use_ipv6"):
1762
server_settings[option] = server_config.getboolean("DEFAULT",
1763
option)
1764
if server_settings["port"]:
1765
server_settings["port"] = server_config.getint("DEFAULT",
1766
"port")
740
1767
del server_config
741
1768
742
1769
# Override the settings from the config file with command line
743
1770
# options, if set.
744
1771
for option in ("interface", "address", "port", "debug",
745
"priority", "servicename", "configdir"):
1772
"priority", "servicename", "configdir",
1773
"use_dbus", "use_ipv6", "debuglevel"):
746
1774
value = getattr(options, option)
747
1775
if value is not None:
748
1776
server_settings[option] = value
749
1777
del options
1778
# Force all strings to be unicode
1779
for option in server_settings.keys():
1780
if type(server_settings[option]) is str:
1781
server_settings[option] = unicode(server_settings[option])
750
1782
# Now we have our good server settings in "server_settings"
751
1783
1784
##################################################################
1785
1786
# For convenience
752
1787
debug = server_settings["debug"]
753
754
if not debug:
755
syslogger.setLevel(logging.WARNING)
756
console.setLevel(logging.WARNING)
757
1788
debuglevel = server_settings["debuglevel"]
1789
use_dbus = server_settings["use_dbus"]
1790
use_ipv6 = server_settings["use_ipv6"]
1791
758
1792
if server_settings["servicename"] != "Mandos":
759
syslogger.setFormatter(logging.Formatter\
760
('Mandos (%s): %%(levelname)s:'
761
' %%(message)s'
1793
syslogger.setFormatter(logging.Formatter
1794
('Mandos (%s) [%%(process)d]:'
1795
' %%(levelname)s: %%(message)s'
762
1796
% server_settings["servicename"]))
763
1797
764
1798
# Parse config file with clients
765
1799
client_defaults = { "timeout": "1h",
766
1800
"interval": "5m",
767
"checker": "fping -q -- %(host)s",
1801
"checker": "fping -q -- %%(host)s",
768
1802
"host": "",
1803
"approval_delay": "0s",
1804
"approval_duration": "1s",
769
1805
}
770
client_config = ConfigParser.SafeConfigParser(client_defaults)
1806
client_config = configparser.SafeConfigParser(client_defaults)
771
1807
client_config.read(os.path.join(server_settings["configdir"],
772
1808
"clients.conf"))
773
1809
774
clients = Set()
775
tcp_server = IPv6_TCPServer((server_settings["address"],
776
server_settings["port"]),
777
TCP_handler,
778
settings=server_settings,
779
clients=clients)
780
pidfilename = "/var/run/mandos.pid"
781
try:
782
pidfile = open(pidfilename, "w")
783
except IOError, error:
784
logger.error("Could not open file %r", pidfilename)
785
786
uid = 65534
787
gid = 65534
788
try:
789
uid = pwd.getpwnam("mandos").pw_uid
790
except KeyError:
791
try:
792
uid = pwd.getpwnam("nobody").pw_uid
793
except KeyError:
794
pass
795
try:
796
gid = pwd.getpwnam("mandos").pw_gid
797
except KeyError:
798
try:
799
gid = pwd.getpwnam("nogroup").pw_gid
800
except KeyError:
801
pass
802
try:
1810
global mandos_dbus_service
1811
mandos_dbus_service = None
1812
1813
tcp_server = MandosServer((server_settings["address"],
1814
server_settings["port"]),
1815
ClientHandler,
1816
interface=(server_settings["interface"]
1817
or None),
1818
use_ipv6=use_ipv6,
1819
gnutls_priority=
1820
server_settings["priority"],
1821
use_dbus=use_dbus)
1822
if not debug:
1823
pidfilename = "/var/run/mandos.pid"
1824
try:
1825
pidfile = open(pidfilename, "w")
1826
except IOError:
1827
logger.error("Could not open file %r", pidfilename)
1828
1829
try:
1830
uid = pwd.getpwnam("_mandos").pw_uid
1831
gid = pwd.getpwnam("_mandos").pw_gid
1832
except KeyError:
1833
try:
1834
uid = pwd.getpwnam("mandos").pw_uid
1835
gid = pwd.getpwnam("mandos").pw_gid
1836
except KeyError:
1837
try:
1838
uid = pwd.getpwnam("nobody").pw_uid
1839
gid = pwd.getpwnam("nobody").pw_gid
1840
except KeyError:
1841
uid = 65534
1842
gid = 65534
1843
try:
1844
os.setgid(gid)
803
1845
os.setuid(uid)
804
os.setgid(gid)
805
except OSError, error:
1846
except OSError as error:
806
1847
if error[0] != errno.EPERM:
807
1848
raise error
808
1849
809
global service
810
service = AvahiService(name = server_settings["servicename"],
811
servicetype = "_mandos._tcp", )
812
if server_settings["interface"]:
813
service.interface = if_nametoindex\
814
(server_settings["interface"])
815
816
global main_loop
817
global bus
818
global server
819
# From the Avahi example code
820
DBusGMainLoop(set_as_default=True )
821
main_loop = gobject.MainLoop()
822
bus = dbus.SystemBus()
823
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
824
avahi.DBUS_PATH_SERVER),
825
avahi.DBUS_INTERFACE_SERVER)
826
# End of Avahi example code
827
828
def remove_from_clients(client):
829
clients.remove(client)
830
if not clients:
831
logger.critical(u"No clients left, exiting")
832
sys.exit()
833
834
clients.update(Set(Client(name = section,
835
stop_hook = remove_from_clients,
836
config
837
= dict(client_config.items(section)))
838
for section in client_config.sections()))
839
if not clients:
840
logger.critical(u"No clients defined")
841
sys.exit(1)
842
1850
if not debug and not debuglevel:
1851
syslogger.setLevel(logging.WARNING)
1852
console.setLevel(logging.WARNING)
1853
if debuglevel:
1854
level = getattr(logging, debuglevel.upper())
1855
syslogger.setLevel(level)
1856
console.setLevel(level)
1857
843
1858
if debug:
1859
# Enable all possible GnuTLS debugging
1860
1861
# "Use a log level over 10 to enable all debugging options."
1862
# - GnuTLS manual
1863
gnutls.library.functions.gnutls_global_set_log_level(11)
1864
1865
@gnutls.library.types.gnutls_log_func
1866
def debug_gnutls(level, string):
1867
logger.debug("GnuTLS: %s", string[:-1])
1868
1869
(gnutls.library.functions
1870
.gnutls_global_set_log_function(debug_gnutls))
1871
844
1872
# Redirect stdin so all checkers get /dev/null
845
1873
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
846
1874
os.dup2(null, sys.stdin.fileno())
849
1877
else:
850
1878
# No console logging
851
1879
logger.removeHandler(console)
1880
1881
# Need to fork before connecting to D-Bus
1882
if not debug:
852
1883
# Close all input and output, do double fork, etc.
853
1884
daemon()
854
1885
855
try:
856
pid = os.getpid()
857
pidfile.write(str(pid) + "\n")
858
pidfile.close()
859
del pidfile
860
except IOError:
861
logger.error(u"Could not write to file %r with PID %d",
862
pidfilename, pid)
863
except NameError:
864
# "pidfile" was never created
865
pass
866
del pidfilename
1886
global main_loop
1887
# From the Avahi example code
1888
DBusGMainLoop(set_as_default=True )
1889
main_loop = gobject.MainLoop()
1890
bus = dbus.SystemBus()
1891
# End of Avahi example code
1892
if use_dbus:
1893
try:
1894
bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1895
bus, do_not_queue=True)
1896
except dbus.exceptions.NameExistsException as e:
1897
logger.error(unicode(e) + ", disabling D-Bus")
1898
use_dbus = False
1899
server_settings["use_dbus"] = False
1900
tcp_server.use_dbus = False
1901
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1902
service = AvahiService(name = server_settings["servicename"],
1903
servicetype = "_mandos._tcp",
1904
protocol = protocol, bus = bus)
1905
if server_settings["interface"]:
1906
service.interface = (if_nametoindex
1907
(str(server_settings["interface"])))
1908
1909
global multiprocessing_manager
1910
multiprocessing_manager = multiprocessing.Manager()
1911
1912
client_class = Client
1913
if use_dbus:
1914
client_class = functools.partial(ClientDBus, bus = bus)
1915
def client_config_items(config, section):
1916
special_settings = {
1917
"approved_by_default":
1918
lambda: config.getboolean(section,
1919
"approved_by_default"),
1920
}
1921
for name, value in config.items(section):
1922
try:
1923
yield (name, special_settings[name]())
1924
except KeyError:
1925
yield (name, value)
1926
1927
tcp_server.clients.update(set(
1928
client_class(name = section,
1929
config= dict(client_config_items(
1930
client_config, section)))
1931
for section in client_config.sections()))
1932
if not tcp_server.clients:
1933
logger.warning("No clients defined")
1934
1935
if not debug:
1936
try:
1937
with pidfile:
1938
pid = os.getpid()
1939
pidfile.write(str(pid) + "\n".encode("utf-8"))
1940
del pidfile
1941
except IOError:
1942
logger.error("Could not write to file %r with PID %d",
1943
pidfilename, pid)
1944
except NameError:
1945
# "pidfile" was never created
1946
pass
1947
del pidfilename
1948
1949
signal.signal(signal.SIGINT, signal.SIG_IGN)
1950
1951
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1952
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1953
1954
if use_dbus:
1955
class MandosDBusService(dbus.service.Object):
1956
"""A D-Bus proxy object"""
1957
def __init__(self):
1958
dbus.service.Object.__init__(self, bus, "/")
1959
_interface = "se.bsnet.fukt.Mandos"
1960
1961
@dbus.service.signal(_interface, signature="o")
1962
def ClientAdded(self, objpath):
1963
"D-Bus signal"
1964
pass
1965
1966
@dbus.service.signal(_interface, signature="ss")
1967
def ClientNotFound(self, fingerprint, address):
1968
"D-Bus signal"
1969
pass
1970
1971
@dbus.service.signal(_interface, signature="os")
1972
def ClientRemoved(self, objpath, name):
1973
"D-Bus signal"
1974
pass
1975
1976
@dbus.service.method(_interface, out_signature="ao")
1977
def GetAllClients(self):
1978
"D-Bus method"
1979
return dbus.Array(c.dbus_object_path
1980
for c in tcp_server.clients)
1981
1982
@dbus.service.method(_interface,
1983
out_signature="a{oa{sv}}")
1984
def GetAllClientsWithProperties(self):
1985
"D-Bus method"
1986
return dbus.Dictionary(
1987
((c.dbus_object_path, c.GetAll(""))
1988
for c in tcp_server.clients),
1989
signature="oa{sv}")
1990
1991
@dbus.service.method(_interface, in_signature="o")
1992
def RemoveClient(self, object_path):
1993
"D-Bus method"
1994
for c in tcp_server.clients:
1995
if c.dbus_object_path == object_path:
1996
tcp_server.clients.remove(c)
1997
c.remove_from_connection()
1998
# Don't signal anything except ClientRemoved
1999
c.disable(quiet=True)
2000
# Emit D-Bus signal
2001
self.ClientRemoved(object_path, c.name)
2002
return
2003
raise KeyError(object_path)
2004
2005
del _interface
2006
2007
mandos_dbus_service = MandosDBusService()
867
2008
868
2009
def cleanup():
869
2010
"Cleanup function; run on exit"
870
global group
871
# From the Avahi example code
872
if not group is None:
873
group.Free()
874
group = None
875
# End of Avahi example code
2011
service.cleanup()
876
2012
877
while clients:
878
client = clients.pop()
879
client.stop_hook = None
880
client.stop()
2013
while tcp_server.clients:
2014
client = tcp_server.clients.pop()
2015
if use_dbus:
2016
client.remove_from_connection()
2017
client.disable_hook = None
2018
# Don't signal anything except ClientRemoved
2019
client.disable(quiet=True)
2020
if use_dbus:
2021
# Emit D-Bus signal
2022
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2023
client.name)
881
2024
882
2025
atexit.register(cleanup)
883
2026
884
if not debug:
885
signal.signal(signal.SIGINT, signal.SIG_IGN)
886
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
887
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
888
889
for client in clients:
890
client.start()
2027
for client in tcp_server.clients:
2028
if use_dbus:
2029
# Emit D-Bus signal
2030
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2031
client.enable()
891
2032
892
2033
tcp_server.enable()
893
2034
tcp_server.server_activate()
894
2035
895
2036
# Find out what port we got
896
2037
service.port = tcp_server.socket.getsockname()[1]
897
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
898
u" scope_id %d" % tcp_server.socket.getsockname())
2038
if use_ipv6:
2039
logger.info("Now listening on address %r, port %d,"
2040
" flowinfo %d, scope_id %d"
2041
% tcp_server.socket.getsockname())
2042
else: # IPv4
2043
logger.info("Now listening on address %r, port %d"
2044
% tcp_server.socket.getsockname())
899
2045
900
2046
#service.interface = tcp_server.socket.getsockname()[3]
901
2047
902
2048
try:
903
2049
# From the Avahi example code
904
server.connect_to_signal("StateChanged", server_state_changed)
905
2050
try:
906
server_state_changed(server.GetState())
907
except dbus.exceptions.DBusException, error:
908
logger.critical(u"DBusException: %s", error)
2051
service.activate()
2052
except dbus.exceptions.DBusException as error:
2053
logger.critical("DBusException: %s", error)
2054
cleanup()
909
2055
sys.exit(1)
910
2056
# End of Avahi example code
911
2057
912
2058
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
913
2059
lambda *args, **kwargs:
914
tcp_server.handle_request\
915
(*args[2:], **kwargs) or True)
2060
(tcp_server.handle_request
2061
(*args[2:], **kwargs) or True))
916
2062
917
logger.debug(u"Starting main loop")
2063
logger.debug("Starting main loop")
918
2064
main_loop.run()
919
except AvahiError, error:
920
logger.critical(u"AvahiError: %s" + unicode(error))
2065
except AvahiError as error:
2066
logger.critical("AvahiError: %s", error)
2067
cleanup()
921
2068
sys.exit(1)
922
2069
except KeyboardInterrupt:
923
2070
if debug:
924
print
2071
print("", file=sys.stderr)
2072
logger.debug("Server received KeyboardInterrupt")
2073
logger.debug("Server exiting")
2074
# Must run before the D-Bus bus name gets deregistered
2075
cleanup()
925
2076
926
2077
if __name__ == '__main__':
927
2078
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0