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- Committer: Teddy Hogeborn
- Date: 2011-04-02 06:37:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20110402063718-13ldrcuu0t33sdc4
* mandos: Tolerate restarting Avahi servers. Also Changed to new
"except x as y" exception syntax.
(AvahiService.entry_group_state_changed_match): New; contains the
SignalMatch object.
(AvahiService.remove): Really remove the group and the signal
connection, if any.
(AvahiService.add): Always create a new group and signal connection.
(AvahiService.cleanup): Changed to simply call remove().
(AvahiService.server_state_changed): Handle and log more bad states.
(AvahiService.activate): Set "follow_name_owner_changes=True" on the
Avahi Server proxy object.
(ClientDBus.checked_ok): Do not return anything.
(ClientDBus.CheckedOK): Do not return anything, as documented.
* mandos-monitor: Call D-Bus methods asynchronously.
"except x as y" exception syntax.
(AvahiService.entry_group_state_changed_match): New; contains the
SignalMatch object.
(AvahiService.remove): Really remove the group and the signal
connection, if any.
(AvahiService.add): Always create a new group and signal connection.
(AvahiService.cleanup): Changed to simply call remove().
(AvahiService.server_state_changed): Handle and log more bad states.
(AvahiService.activate): Set "follow_name_owner_changes=True" on the
Avahi Server proxy object.
(ClientDBus.checked_ok): Do not return anything.
(ClientDBus.CheckedOK): Do not return anything, as documented.
* mandos-monitor: Call D-Bus methods asynchronously.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
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
#
13
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
# Copyright © 2008-2011 Teddy Hogeborn
15
# Copyright © 2008-2011 Björn Påhlsson
15
16
#
16
17
# 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
24
25
# GNU General Public License for more details.
25
26
#
26
27
# You should have received a copy of the GNU General Public License
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
28
# along with this program. If not, see
29
# <http://www.gnu.org/licenses/>.
28
30
#
29
31
# Contact the authors at <mandos@fukt.bsnet.se>.
30
32
#
31
33
32
from __future__ import division
34
from __future__ import (division, absolute_import, print_function,
35
unicode_literals)
33
36
34
import SocketServer
37
import SocketServer as socketserver
35
38
import socket
36
import select
37
from optparse import OptionParser
39
import argparse
38
40
import datetime
39
41
import errno
40
42
import gnutls.crypto
43
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
53
import subprocess
53
54
import atexit
54
55
import stat
55
56
import logging
56
57
import logging.handlers
58
import pwd
59
import contextlib
60
import struct
61
import fcntl
62
import functools
63
import cPickle as pickle
64
import multiprocessing
57
65
58
66
import dbus
67
import dbus.service
59
68
import gobject
60
69
import avahi
61
70
from dbus.mainloop.glib import DBusGMainLoop
62
71
import ctypes
63
64
version = "1.0"
65
72
import ctypes.util
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')
66
88
logger = logging.Logger('mandos')
67
syslogger = logging.handlers.SysLogHandler\
68
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
address = "/dev/log")
70
syslogger.setFormatter(logging.Formatter\
71
('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'))
72
95
logger.addHandler(syslogger)
73
96
97
console = logging.StreamHandler()
98
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
' %(levelname)s:'
100
' %(message)s'))
101
logger.addHandler(console)
74
102
75
103
class AvahiError(Exception):
76
def __init__(self, value):
104
def __init__(self, value, *args, **kwargs):
77
105
self.value = value
78
def __str__(self):
79
return repr(self.value)
106
super(AvahiError, self).__init__(value, *args, **kwargs)
107
def __unicode__(self):
108
return unicode(repr(self.value))
80
109
81
110
class AvahiServiceError(AvahiError):
82
111
pass
87
116
88
117
class AvahiService(object):
89
118
"""An Avahi (Zeroconf) service.
119
90
120
Attributes:
91
121
interface: integer; avahi.IF_UNSPEC or an interface index.
92
122
Used to optionally bind to the specified interface.
100
130
max_renames: integer; maximum number of renames
101
131
rename_count: integer; counter so we only rename after collisions
102
132
a sensible number of times
133
group: D-Bus Entry Group
134
server: D-Bus Server
135
bus: dbus.SystemBus()
103
136
"""
104
137
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
105
type = None, port = None, TXT = None, domain = "",
106
host = "", max_renames = 32768):
138
servicetype = None, port = None, TXT = None,
139
domain = "", host = "", max_renames = 32768,
140
protocol = avahi.PROTO_UNSPEC, bus = None):
107
141
self.interface = interface
108
142
self.name = name
109
self.type = type
143
self.type = servicetype
110
144
self.port = port
111
if TXT is None:
112
self.TXT = []
113
else:
114
self.TXT = TXT
145
self.TXT = TXT if TXT is not None else []
115
146
self.domain = domain
116
147
self.host = host
117
148
self.rename_count = 0
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
118
155
def rename(self):
119
156
"""Derived from the Avahi example code"""
120
157
if self.rename_count >= self.max_renames:
121
logger.critical(u"No suitable service name found after %i"
122
u" retries, exiting.", rename_count)
158
logger.critical("No suitable Zeroconf service name found"
159
" after %i retries, exiting.",
160
self.rename_count)
123
161
raise AvahiServiceError("Too many renames")
124
name = server.GetAlternativeServiceName(name)
125
logger.error(u"Changing name to %r ...", name)
126
syslogger.setFormatter(logging.Formatter\
127
('Mandos (%s): %%(levelname)s:'
128
' %%(message)s' % 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))
129
169
self.remove()
130
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)
131
176
self.rename_count += 1
132
177
def remove(self):
133
178
"""Derived from the Avahi example code"""
134
if group is not None:
135
group.Reset()
179
if self.group is not None:
180
try:
181
self.group.Free()
182
except (dbus.exceptions.UnknownMethodException,
183
dbus.exceptions.DBusException) as e:
184
pass
185
self.group = None
186
if self.entry_group_state_changed_match is not None:
187
self.entry_group_state_changed_match.remove()
188
self.entry_group_state_changed_match = None
136
189
def add(self):
137
190
"""Derived from the Avahi example code"""
138
global group
139
if group is None:
140
group = dbus.Interface\
141
(bus.get_object(avahi.DBUS_NAME,
142
server.EntryGroupNew()),
143
avahi.DBUS_INTERFACE_ENTRY_GROUP)
144
group.connect_to_signal('StateChanged',
145
entry_group_state_changed)
146
logger.debug(u"Adding service '%s' of type '%s' ...",
147
service.name, service.type)
148
group.AddService(
149
self.interface, # interface
150
avahi.PROTO_INET6, # protocol
151
dbus.UInt32(0), # flags
152
self.name, self.type,
153
self.domain, self.host,
154
dbus.UInt16(self.port),
155
avahi.string_array_to_txt_array(self.TXT))
156
group.Commit()
157
158
# From the Avahi example code:
159
group = None # our entry group
160
# End of Avahi example code
191
self.remove()
192
self.group = dbus.Interface(
193
self.bus.get_object(avahi.DBUS_NAME,
194
self.server.EntryGroupNew(),
195
follow_name_owner_changes=True),
196
avahi.DBUS_INTERFACE_ENTRY_GROUP)
197
self.entry_group_state_changed_match = (
198
self.group.connect_to_signal(
199
'StateChanged', self .entry_group_state_changed))
200
logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
201
self.name, self.type)
202
self.group.AddService(
203
self.interface,
204
self.protocol,
205
dbus.UInt32(0), # flags
206
self.name, self.type,
207
self.domain, self.host,
208
dbus.UInt16(self.port),
209
avahi.string_array_to_txt_array(self.TXT))
210
self.group.Commit()
211
def entry_group_state_changed(self, state, error):
212
"""Derived from the Avahi example code"""
213
logger.debug("Avahi entry group state change: %i", state)
214
215
if state == avahi.ENTRY_GROUP_ESTABLISHED:
216
logger.debug("Zeroconf service established.")
217
elif state == avahi.ENTRY_GROUP_COLLISION:
218
logger.info("Zeroconf service name collision.")
219
self.rename()
220
elif state == avahi.ENTRY_GROUP_FAILURE:
221
logger.critical("Avahi: Error in group state changed %s",
222
unicode(error))
223
raise AvahiGroupError("State changed: %s"
224
% unicode(error))
225
def cleanup(self):
226
"""Derived from the Avahi example code"""
227
self.remove()
228
def server_state_changed(self, state, error=None):
229
"""Derived from the Avahi example code"""
230
logger.debug("Avahi server state change: %i", state)
231
bad_states = { avahi.SERVER_INVALID:
232
"Zeroconf server invalid",
233
avahi.SERVER_REGISTERING: None,
234
avahi.SERVER_COLLISION:
235
"Zeroconf server name collision",
236
avahi.SERVER_FAILURE:
237
"Zeroconf server failure" }
238
if state in bad_states:
239
if bad_states[state]:
240
logger.error(bad_states[state])
241
self.remove()
242
elif state == avahi.SERVER_RUNNING:
243
self.add()
244
else:
245
logger.debug("Unknown state: %r", state)
246
def activate(self):
247
"""Derived from the Avahi example code"""
248
if self.server is None:
249
self.server = dbus.Interface(
250
self.bus.get_object(avahi.DBUS_NAME,
251
avahi.DBUS_PATH_SERVER,
252
follow_name_owner_changes=True),
253
avahi.DBUS_INTERFACE_SERVER)
254
self.server.connect_to_signal("StateChanged",
255
self.server_state_changed)
256
self.server_state_changed(self.server.GetState())
161
257
162
258
163
259
class Client(object):
164
260
"""A representation of a client host served by this server.
261
165
262
Attributes:
166
name: string; from the config file, used in log messages
263
_approved: bool(); 'None' if not yet approved/disapproved
264
approval_delay: datetime.timedelta(); Time to wait for approval
265
approval_duration: datetime.timedelta(); Duration of one approval
266
checker: subprocess.Popen(); a running checker process used
267
to see if the client lives.
268
'None' if no process is running.
269
checker_callback_tag: a gobject event source tag, or None
270
checker_command: string; External command which is run to check
271
if client lives. %() expansions are done at
272
runtime with vars(self) as dict, so that for
273
instance %(name)s can be used in the command.
274
checker_initiator_tag: a gobject event source tag, or None
275
created: datetime.datetime(); (UTC) object creation
276
current_checker_command: string; current running checker_command
277
disable_hook: If set, called by disable() as disable_hook(self)
278
disable_initiator_tag: a gobject event source tag, or None
279
enabled: bool()
167
280
fingerprint: string (40 or 32 hexadecimal digits); used to
168
281
uniquely identify the client
169
secret: bytestring; sent verbatim (over TLS) to client
170
host: string; available for use by the checker command
171
created: datetime.datetime(); object creation, not client host
172
last_checked_ok: datetime.datetime() or None if not yet checked OK
173
timeout: datetime.timedelta(); How long from last_checked_ok
174
until this client is invalid
175
interval: datetime.timedelta(); How often to start a new checker
176
stop_hook: If set, called by stop() as stop_hook(self)
177
checker: subprocess.Popen(); a running checker process used
178
to see if the client lives.
179
'None' if no process is running.
180
checker_initiator_tag: a gobject event source tag, or None
181
stop_initiator_tag: - '' -
182
checker_callback_tag: - '' -
183
checker_command: string; External command which is run to check if
184
client lives. %() expansions are done at
185
runtime with vars(self) as dict, so that for
186
instance %(name)s can be used in the command.
187
Private attibutes:
188
_timeout: Real variable for 'timeout'
189
_interval: Real variable for 'interval'
190
_timeout_milliseconds: Used when calling gobject.timeout_add()
191
_interval_milliseconds: - '' -
282
host: string; available for use by the checker command
283
interval: datetime.timedelta(); How often to start a new checker
284
last_approval_request: datetime.datetime(); (UTC) or None
285
last_checked_ok: datetime.datetime(); (UTC) or None
286
last_enabled: datetime.datetime(); (UTC)
287
name: string; from the config file, used in log messages and
288
D-Bus identifiers
289
secret: bytestring; sent verbatim (over TLS) to client
290
timeout: datetime.timedelta(); How long from last_checked_ok
291
until this client is disabled
292
runtime_expansions: Allowed attributes for runtime expansion.
192
293
"""
193
def _set_timeout(self, timeout):
194
"Setter function for 'timeout' attribute"
195
self._timeout = timeout
196
self._timeout_milliseconds = ((self.timeout.days
197
* 24 * 60 * 60 * 1000)
198
+ (self.timeout.seconds * 1000)
199
+ (self.timeout.microseconds
200
// 1000))
201
timeout = property(lambda self: self._timeout,
202
_set_timeout)
203
del _set_timeout
204
def _set_interval(self, interval):
205
"Setter function for 'interval' attribute"
206
self._interval = interval
207
self._interval_milliseconds = ((self.interval.days
208
* 24 * 60 * 60 * 1000)
209
+ (self.interval.seconds
210
* 1000)
211
+ (self.interval.microseconds
212
// 1000))
213
interval = property(lambda self: self._interval,
214
_set_interval)
215
del _set_interval
216
def __init__(self, name = None, stop_hook=None, config={}):
294
295
runtime_expansions = ("approval_delay", "approval_duration",
296
"created", "enabled", "fingerprint",
297
"host", "interval", "last_checked_ok",
298
"last_enabled", "name", "timeout")
299
300
@staticmethod
301
def _timedelta_to_milliseconds(td):
302
"Convert a datetime.timedelta() to milliseconds"
303
return ((td.days * 24 * 60 * 60 * 1000)
304
+ (td.seconds * 1000)
305
+ (td.microseconds // 1000))
306
307
def timeout_milliseconds(self):
308
"Return the 'timeout' attribute in milliseconds"
309
return self._timedelta_to_milliseconds(self.timeout)
310
311
def interval_milliseconds(self):
312
"Return the 'interval' attribute in milliseconds"
313
return self._timedelta_to_milliseconds(self.interval)
314
315
def approval_delay_milliseconds(self):
316
return self._timedelta_to_milliseconds(self.approval_delay)
317
318
def __init__(self, name = None, disable_hook=None, config=None):
217
319
"""Note: the 'checker' key in 'config' sets the
218
320
'checker_command' attribute and *not* the 'checker'
219
321
attribute."""
220
322
self.name = name
221
logger.debug(u"Creating client %r", self.name)
323
if config is None:
324
config = {}
325
logger.debug("Creating client %r", self.name)
222
326
# Uppercase and remove spaces from fingerprint for later
223
327
# comparison purposes with return value from the fingerprint()
224
328
# function
225
self.fingerprint = config["fingerprint"].upper()\
226
.replace(u" ", u"")
227
logger.debug(u" Fingerprint: %s", self.fingerprint)
329
self.fingerprint = (config["fingerprint"].upper()
330
.replace(" ", ""))
331
logger.debug(" Fingerprint: %s", self.fingerprint)
228
332
if "secret" in config:
229
self.secret = config["secret"].decode(u"base64")
333
self.secret = config["secret"].decode("base64")
230
334
elif "secfile" in config:
231
sf = open(config["secfile"])
232
self.secret = sf.read()
233
sf.close()
335
with open(os.path.expanduser(os.path.expandvars
336
(config["secfile"])),
337
"rb") as secfile:
338
self.secret = secfile.read()
234
339
else:
235
raise TypeError(u"No secret or secfile for client %s"
340
raise TypeError("No secret or secfile for client %s"
236
341
% self.name)
237
342
self.host = config.get("host", "")
238
self.created = datetime.datetime.now()
343
self.created = datetime.datetime.utcnow()
344
self.enabled = False
345
self.last_approval_request = None
346
self.last_enabled = None
239
347
self.last_checked_ok = None
240
348
self.timeout = string_to_delta(config["timeout"])
241
349
self.interval = string_to_delta(config["interval"])
242
self.stop_hook = stop_hook
350
self.disable_hook = disable_hook
243
351
self.checker = None
244
352
self.checker_initiator_tag = None
245
self.stop_initiator_tag = None
353
self.disable_initiator_tag = None
246
354
self.checker_callback_tag = None
247
self.check_command = config["checker"]
248
def start(self):
355
self.checker_command = config["checker"]
356
self.current_checker_command = None
357
self.last_connect = None
358
self._approved = None
359
self.approved_by_default = config.get("approved_by_default",
360
True)
361
self.approvals_pending = 0
362
self.approval_delay = string_to_delta(
363
config["approval_delay"])
364
self.approval_duration = string_to_delta(
365
config["approval_duration"])
366
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
367
368
def send_changedstate(self):
369
self.changedstate.acquire()
370
self.changedstate.notify_all()
371
self.changedstate.release()
372
373
def enable(self):
249
374
"""Start this client's checker and timeout hooks"""
375
if getattr(self, "enabled", False):
376
# Already enabled
377
return
378
self.send_changedstate()
379
self.last_enabled = datetime.datetime.utcnow()
250
380
# Schedule a new checker to be started an 'interval' from now,
251
381
# and every interval from then on.
252
self.checker_initiator_tag = gobject.timeout_add\
253
(self._interval_milliseconds,
254
self.start_checker)
382
self.checker_initiator_tag = (gobject.timeout_add
383
(self.interval_milliseconds(),
384
self.start_checker))
385
# Schedule a disable() when 'timeout' has passed
386
self.disable_initiator_tag = (gobject.timeout_add
387
(self.timeout_milliseconds(),
388
self.disable))
389
self.enabled = True
255
390
# Also start a new checker *right now*.
256
391
self.start_checker()
257
# Schedule a stop() when 'timeout' has passed
258
self.stop_initiator_tag = gobject.timeout_add\
259
(self._timeout_milliseconds,
260
self.stop)
261
def stop(self):
262
"""Stop this client.
263
The possibility that a client might be restarted is left open,
264
but not currently used."""
265
# If this client doesn't have a secret, it is already stopped.
266
if hasattr(self, "secret") and self.secret:
267
logger.info(u"Stopping client %s", self.name)
268
self.secret = None
269
else:
392
393
def disable(self, quiet=True):
394
"""Disable this client."""
395
if not getattr(self, "enabled", False):
270
396
return False
271
if getattr(self, "stop_initiator_tag", False):
272
gobject.source_remove(self.stop_initiator_tag)
273
self.stop_initiator_tag = None
397
if not quiet:
398
self.send_changedstate()
399
if not quiet:
400
logger.info("Disabling client %s", self.name)
401
if getattr(self, "disable_initiator_tag", False):
402
gobject.source_remove(self.disable_initiator_tag)
403
self.disable_initiator_tag = None
274
404
if getattr(self, "checker_initiator_tag", False):
275
405
gobject.source_remove(self.checker_initiator_tag)
276
406
self.checker_initiator_tag = None
277
407
self.stop_checker()
278
if self.stop_hook:
279
self.stop_hook(self)
408
if self.disable_hook:
409
self.disable_hook(self)
410
self.enabled = False
280
411
# Do not run this again if called by a gobject.timeout_add
281
412
return False
413
282
414
def __del__(self):
283
self.stop_hook = None
284
self.stop()
285
def checker_callback(self, pid, condition):
415
self.disable_hook = None
416
self.disable()
417
418
def checker_callback(self, pid, condition, command):
286
419
"""The checker has completed, so take appropriate actions."""
287
now = datetime.datetime.now()
288
420
self.checker_callback_tag = None
289
421
self.checker = None
290
if os.WIFEXITED(condition) \
291
and (os.WEXITSTATUS(condition) == 0):
292
logger.info(u"Checker for %(name)s succeeded",
293
vars(self))
294
self.last_checked_ok = now
295
gobject.source_remove(self.stop_initiator_tag)
296
self.stop_initiator_tag = gobject.timeout_add\
297
(self._timeout_milliseconds,
298
self.stop)
299
elif not os.WIFEXITED(condition):
300
logger.warning(u"Checker for %(name)s crashed?",
422
if os.WIFEXITED(condition):
423
exitstatus = os.WEXITSTATUS(condition)
424
if exitstatus == 0:
425
logger.info("Checker for %(name)s succeeded",
426
vars(self))
427
self.checked_ok()
428
else:
429
logger.info("Checker for %(name)s failed",
430
vars(self))
431
else:
432
logger.warning("Checker for %(name)s crashed?",
301
433
vars(self))
302
else:
303
logger.info(u"Checker for %(name)s failed",
304
vars(self))
434
435
def checked_ok(self):
436
"""Bump up the timeout for this client.
437
438
This should only be called when the client has been seen,
439
alive and well.
440
"""
441
self.last_checked_ok = datetime.datetime.utcnow()
442
gobject.source_remove(self.disable_initiator_tag)
443
self.disable_initiator_tag = (gobject.timeout_add
444
(self.timeout_milliseconds(),
445
self.disable))
446
447
def need_approval(self):
448
self.last_approval_request = datetime.datetime.utcnow()
449
305
450
def start_checker(self):
306
451
"""Start a new checker subprocess if one is not running.
452
307
453
If a checker already exists, leave it running and do
308
454
nothing."""
309
455
# The reason for not killing a running checker is that if we
312
458
# client would inevitably timeout, since no checker would get
313
459
# a chance to run to completion. If we instead leave running
314
460
# checkers alone, the checker would have to take more time
315
# than 'timeout' for the client to be declared invalid, which
316
# is as it should be.
461
# than 'timeout' for the client to be disabled, which is as it
462
# should be.
463
464
# If a checker exists, make sure it is not a zombie
465
try:
466
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
467
except (AttributeError, OSError) as error:
468
if (isinstance(error, OSError)
469
and error.errno != errno.ECHILD):
470
raise error
471
else:
472
if pid:
473
logger.warning("Checker was a zombie")
474
gobject.source_remove(self.checker_callback_tag)
475
self.checker_callback(pid, status,
476
self.current_checker_command)
477
# Start a new checker if needed
317
478
if self.checker is None:
318
479
try:
319
# In case check_command has exactly one % operator
320
command = self.check_command % self.host
480
# In case checker_command has exactly one % operator
481
command = self.checker_command % self.host
321
482
except TypeError:
322
483
# Escape attributes for the shell
323
escaped_attrs = dict((key, re.escape(str(val)))
324
for key, val in
325
vars(self).iteritems())
484
escaped_attrs = dict(
485
(attr,
486
re.escape(unicode(str(getattr(self, attr, "")),
487
errors=
488
'replace')))
489
for attr in
490
self.runtime_expansions)
491
326
492
try:
327
command = self.check_command % escaped_attrs
328
except TypeError, error:
329
logger.error(u'Could not format string "%s":'
330
u' %s', self.check_command, error)
493
command = self.checker_command % escaped_attrs
494
except TypeError as error:
495
logger.error('Could not format string "%s":'
496
' %s', self.checker_command, error)
331
497
return True # Try again later
498
self.current_checker_command = command
332
499
try:
333
logger.info(u"Starting checker %r for %s",
500
logger.info("Starting checker %r for %s",
334
501
command, self.name)
502
# We don't need to redirect stdout and stderr, since
503
# in normal mode, that is already done by daemon(),
504
# and in debug mode we don't want to. (Stdin is
505
# always replaced by /dev/null.)
335
506
self.checker = subprocess.Popen(command,
336
507
close_fds=True,
337
508
shell=True, cwd="/")
338
self.checker_callback_tag = gobject.child_watch_add\
339
(self.checker.pid,
340
self.checker_callback)
341
except subprocess.OSError, error:
342
logger.error(u"Failed to start subprocess: %s",
509
self.checker_callback_tag = (gobject.child_watch_add
510
(self.checker.pid,
511
self.checker_callback,
512
data=command))
513
# The checker may have completed before the gobject
514
# watch was added. Check for this.
515
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
516
if pid:
517
gobject.source_remove(self.checker_callback_tag)
518
self.checker_callback(pid, status, command)
519
except OSError as error:
520
logger.error("Failed to start subprocess: %s",
343
521
error)
344
522
# Re-run this periodically if run by gobject.timeout_add
345
523
return True
524
346
525
def stop_checker(self):
347
526
"""Force the checker process, if any, to stop."""
348
527
if self.checker_callback_tag:
350
529
self.checker_callback_tag = None
351
530
if getattr(self, "checker", None) is None:
352
531
return
353
logger.debug(u"Stopping checker for %(name)s", vars(self))
532
logger.debug("Stopping checker for %(name)s", vars(self))
354
533
try:
355
534
os.kill(self.checker.pid, signal.SIGTERM)
356
#os.sleep(0.5)
535
#time.sleep(0.5)
357
536
#if self.checker.poll() is None:
358
537
# os.kill(self.checker.pid, signal.SIGKILL)
359
except OSError, error:
538
except OSError as error:
360
539
if error.errno != errno.ESRCH: # No such process
361
540
raise
362
541
self.checker = None
363
def still_valid(self):
364
"""Has the timeout not yet passed for this client?"""
365
now = datetime.datetime.now()
542
543
def dbus_service_property(dbus_interface, signature="v",
544
access="readwrite", byte_arrays=False):
545
"""Decorators for marking methods of a DBusObjectWithProperties to
546
become properties on the D-Bus.
547
548
The decorated method will be called with no arguments by "Get"
549
and with one argument by "Set".
550
551
The parameters, where they are supported, are the same as
552
dbus.service.method, except there is only "signature", since the
553
type from Get() and the type sent to Set() is the same.
554
"""
555
# Encoding deeply encoded byte arrays is not supported yet by the
556
# "Set" method, so we fail early here:
557
if byte_arrays and signature != "ay":
558
raise ValueError("Byte arrays not supported for non-'ay'"
559
" signature %r" % signature)
560
def decorator(func):
561
func._dbus_is_property = True
562
func._dbus_interface = dbus_interface
563
func._dbus_signature = signature
564
func._dbus_access = access
565
func._dbus_name = func.__name__
566
if func._dbus_name.endswith("_dbus_property"):
567
func._dbus_name = func._dbus_name[:-14]
568
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
569
return func
570
return decorator
571
572
573
class DBusPropertyException(dbus.exceptions.DBusException):
574
"""A base class for D-Bus property-related exceptions
575
"""
576
def __unicode__(self):
577
return unicode(str(self))
578
579
580
class DBusPropertyAccessException(DBusPropertyException):
581
"""A property's access permissions disallows an operation.
582
"""
583
pass
584
585
586
class DBusPropertyNotFound(DBusPropertyException):
587
"""An attempt was made to access a non-existing property.
588
"""
589
pass
590
591
592
class DBusObjectWithProperties(dbus.service.Object):
593
"""A D-Bus object with properties.
594
595
Classes inheriting from this can use the dbus_service_property
596
decorator to expose methods as D-Bus properties. It exposes the
597
standard Get(), Set(), and GetAll() methods on the D-Bus.
598
"""
599
600
@staticmethod
601
def _is_dbus_property(obj):
602
return getattr(obj, "_dbus_is_property", False)
603
604
def _get_all_dbus_properties(self):
605
"""Returns a generator of (name, attribute) pairs
606
"""
607
return ((prop._dbus_name, prop)
608
for name, prop in
609
inspect.getmembers(self, self._is_dbus_property))
610
611
def _get_dbus_property(self, interface_name, property_name):
612
"""Returns a bound method if one exists which is a D-Bus
613
property with the specified name and interface.
614
"""
615
for name in (property_name,
616
property_name + "_dbus_property"):
617
prop = getattr(self, name, None)
618
if (prop is None
619
or not self._is_dbus_property(prop)
620
or prop._dbus_name != property_name
621
or (interface_name and prop._dbus_interface
622
and interface_name != prop._dbus_interface)):
623
continue
624
return prop
625
# No such property
626
raise DBusPropertyNotFound(self.dbus_object_path + ":"
627
+ interface_name + "."
628
+ property_name)
629
630
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
631
out_signature="v")
632
def Get(self, interface_name, property_name):
633
"""Standard D-Bus property Get() method, see D-Bus standard.
634
"""
635
prop = self._get_dbus_property(interface_name, property_name)
636
if prop._dbus_access == "write":
637
raise DBusPropertyAccessException(property_name)
638
value = prop()
639
if not hasattr(value, "variant_level"):
640
return value
641
return type(value)(value, variant_level=value.variant_level+1)
642
643
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
644
def Set(self, interface_name, property_name, value):
645
"""Standard D-Bus property Set() method, see D-Bus standard.
646
"""
647
prop = self._get_dbus_property(interface_name, property_name)
648
if prop._dbus_access == "read":
649
raise DBusPropertyAccessException(property_name)
650
if prop._dbus_get_args_options["byte_arrays"]:
651
# The byte_arrays option is not supported yet on
652
# signatures other than "ay".
653
if prop._dbus_signature != "ay":
654
raise ValueError
655
value = dbus.ByteArray(''.join(unichr(byte)
656
for byte in value))
657
prop(value)
658
659
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
660
out_signature="a{sv}")
661
def GetAll(self, interface_name):
662
"""Standard D-Bus property GetAll() method, see D-Bus
663
standard.
664
665
Note: Will not include properties with access="write".
666
"""
667
all = {}
668
for name, prop in self._get_all_dbus_properties():
669
if (interface_name
670
and interface_name != prop._dbus_interface):
671
# Interface non-empty but did not match
672
continue
673
# Ignore write-only properties
674
if prop._dbus_access == "write":
675
continue
676
value = prop()
677
if not hasattr(value, "variant_level"):
678
all[name] = value
679
continue
680
all[name] = type(value)(value, variant_level=
681
value.variant_level+1)
682
return dbus.Dictionary(all, signature="sv")
683
684
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
685
out_signature="s",
686
path_keyword='object_path',
687
connection_keyword='connection')
688
def Introspect(self, object_path, connection):
689
"""Standard D-Bus method, overloaded to insert property tags.
690
"""
691
xmlstring = dbus.service.Object.Introspect(self, object_path,
692
connection)
693
try:
694
document = xml.dom.minidom.parseString(xmlstring)
695
def make_tag(document, name, prop):
696
e = document.createElement("property")
697
e.setAttribute("name", name)
698
e.setAttribute("type", prop._dbus_signature)
699
e.setAttribute("access", prop._dbus_access)
700
return e
701
for if_tag in document.getElementsByTagName("interface"):
702
for tag in (make_tag(document, name, prop)
703
for name, prop
704
in self._get_all_dbus_properties()
705
if prop._dbus_interface
706
== if_tag.getAttribute("name")):
707
if_tag.appendChild(tag)
708
# Add the names to the return values for the
709
# "org.freedesktop.DBus.Properties" methods
710
if (if_tag.getAttribute("name")
711
== "org.freedesktop.DBus.Properties"):
712
for cn in if_tag.getElementsByTagName("method"):
713
if cn.getAttribute("name") == "Get":
714
for arg in cn.getElementsByTagName("arg"):
715
if (arg.getAttribute("direction")
716
== "out"):
717
arg.setAttribute("name", "value")
718
elif cn.getAttribute("name") == "GetAll":
719
for arg in cn.getElementsByTagName("arg"):
720
if (arg.getAttribute("direction")
721
== "out"):
722
arg.setAttribute("name", "props")
723
xmlstring = document.toxml("utf-8")
724
document.unlink()
725
except (AttributeError, xml.dom.DOMException,
726
xml.parsers.expat.ExpatError) as error:
727
logger.error("Failed to override Introspection method",
728
error)
729
return xmlstring
730
731
732
class ClientDBus(Client, DBusObjectWithProperties):
733
"""A Client class using D-Bus
734
735
Attributes:
736
dbus_object_path: dbus.ObjectPath
737
bus: dbus.SystemBus()
738
"""
739
740
runtime_expansions = (Client.runtime_expansions
741
+ ("dbus_object_path",))
742
743
# dbus.service.Object doesn't use super(), so we can't either.
744
745
def __init__(self, bus = None, *args, **kwargs):
746
self._approvals_pending = 0
747
self.bus = bus
748
Client.__init__(self, *args, **kwargs)
749
# Only now, when this client is initialized, can it show up on
750
# the D-Bus
751
client_object_name = unicode(self.name).translate(
752
{ord("."): ord("_"),
753
ord("-"): ord("_")})
754
self.dbus_object_path = (dbus.ObjectPath
755
("/clients/" + client_object_name))
756
DBusObjectWithProperties.__init__(self, self.bus,
757
self.dbus_object_path)
758
759
def _get_approvals_pending(self):
760
return self._approvals_pending
761
def _set_approvals_pending(self, value):
762
old_value = self._approvals_pending
763
self._approvals_pending = value
764
bval = bool(value)
765
if (hasattr(self, "dbus_object_path")
766
and bval is not bool(old_value)):
767
dbus_bool = dbus.Boolean(bval, variant_level=1)
768
self.PropertyChanged(dbus.String("ApprovalPending"),
769
dbus_bool)
770
771
approvals_pending = property(_get_approvals_pending,
772
_set_approvals_pending)
773
del _get_approvals_pending, _set_approvals_pending
774
775
@staticmethod
776
def _datetime_to_dbus(dt, variant_level=0):
777
"""Convert a UTC datetime.datetime() to a D-Bus type."""
778
return dbus.String(dt.isoformat(),
779
variant_level=variant_level)
780
781
def enable(self):
782
oldstate = getattr(self, "enabled", False)
783
r = Client.enable(self)
784
if oldstate != self.enabled:
785
# Emit D-Bus signals
786
self.PropertyChanged(dbus.String("Enabled"),
787
dbus.Boolean(True, variant_level=1))
788
self.PropertyChanged(
789
dbus.String("LastEnabled"),
790
self._datetime_to_dbus(self.last_enabled,
791
variant_level=1))
792
return r
793
794
def disable(self, quiet = False):
795
oldstate = getattr(self, "enabled", False)
796
r = Client.disable(self, quiet=quiet)
797
if not quiet and oldstate != self.enabled:
798
# Emit D-Bus signal
799
self.PropertyChanged(dbus.String("Enabled"),
800
dbus.Boolean(False, variant_level=1))
801
return r
802
803
def __del__(self, *args, **kwargs):
804
try:
805
self.remove_from_connection()
806
except LookupError:
807
pass
808
if hasattr(DBusObjectWithProperties, "__del__"):
809
DBusObjectWithProperties.__del__(self, *args, **kwargs)
810
Client.__del__(self, *args, **kwargs)
811
812
def checker_callback(self, pid, condition, command,
813
*args, **kwargs):
814
self.checker_callback_tag = None
815
self.checker = None
816
# Emit D-Bus signal
817
self.PropertyChanged(dbus.String("CheckerRunning"),
818
dbus.Boolean(False, variant_level=1))
819
if os.WIFEXITED(condition):
820
exitstatus = os.WEXITSTATUS(condition)
821
# Emit D-Bus signal
822
self.CheckerCompleted(dbus.Int16(exitstatus),
823
dbus.Int64(condition),
824
dbus.String(command))
825
else:
826
# Emit D-Bus signal
827
self.CheckerCompleted(dbus.Int16(-1),
828
dbus.Int64(condition),
829
dbus.String(command))
830
831
return Client.checker_callback(self, pid, condition, command,
832
*args, **kwargs)
833
834
def checked_ok(self, *args, **kwargs):
835
Client.checked_ok(self, *args, **kwargs)
836
# Emit D-Bus signal
837
self.PropertyChanged(
838
dbus.String("LastCheckedOK"),
839
(self._datetime_to_dbus(self.last_checked_ok,
840
variant_level=1)))
841
842
def need_approval(self, *args, **kwargs):
843
r = Client.need_approval(self, *args, **kwargs)
844
# Emit D-Bus signal
845
self.PropertyChanged(
846
dbus.String("LastApprovalRequest"),
847
(self._datetime_to_dbus(self.last_approval_request,
848
variant_level=1)))
849
return r
850
851
def start_checker(self, *args, **kwargs):
852
old_checker = self.checker
853
if self.checker is not None:
854
old_checker_pid = self.checker.pid
855
else:
856
old_checker_pid = None
857
r = Client.start_checker(self, *args, **kwargs)
858
# Only if new checker process was started
859
if (self.checker is not None
860
and old_checker_pid != self.checker.pid):
861
# Emit D-Bus signal
862
self.CheckerStarted(self.current_checker_command)
863
self.PropertyChanged(
864
dbus.String("CheckerRunning"),
865
dbus.Boolean(True, variant_level=1))
866
return r
867
868
def stop_checker(self, *args, **kwargs):
869
old_checker = getattr(self, "checker", None)
870
r = Client.stop_checker(self, *args, **kwargs)
871
if (old_checker is not None
872
and getattr(self, "checker", None) is None):
873
self.PropertyChanged(dbus.String("CheckerRunning"),
874
dbus.Boolean(False, variant_level=1))
875
return r
876
877
def _reset_approved(self):
878
self._approved = None
879
return False
880
881
def approve(self, value=True):
882
self.send_changedstate()
883
self._approved = value
884
gobject.timeout_add(self._timedelta_to_milliseconds
885
(self.approval_duration),
886
self._reset_approved)
887
888
889
## D-Bus methods, signals & properties
890
_interface = "se.bsnet.fukt.Mandos.Client"
891
892
## Signals
893
894
# CheckerCompleted - signal
895
@dbus.service.signal(_interface, signature="nxs")
896
def CheckerCompleted(self, exitcode, waitstatus, command):
897
"D-Bus signal"
898
pass
899
900
# CheckerStarted - signal
901
@dbus.service.signal(_interface, signature="s")
902
def CheckerStarted(self, command):
903
"D-Bus signal"
904
pass
905
906
# PropertyChanged - signal
907
@dbus.service.signal(_interface, signature="sv")
908
def PropertyChanged(self, property, value):
909
"D-Bus signal"
910
pass
911
912
# GotSecret - signal
913
@dbus.service.signal(_interface)
914
def GotSecret(self):
915
"""D-Bus signal
916
Is sent after a successful transfer of secret from the Mandos
917
server to mandos-client
918
"""
919
pass
920
921
# Rejected - signal
922
@dbus.service.signal(_interface, signature="s")
923
def Rejected(self, reason):
924
"D-Bus signal"
925
pass
926
927
# NeedApproval - signal
928
@dbus.service.signal(_interface, signature="tb")
929
def NeedApproval(self, timeout, default):
930
"D-Bus signal"
931
return self.need_approval()
932
933
## Methods
934
935
# Approve - method
936
@dbus.service.method(_interface, in_signature="b")
937
def Approve(self, value):
938
self.approve(value)
939
940
# CheckedOK - method
941
@dbus.service.method(_interface)
942
def CheckedOK(self):
943
self.checked_ok()
944
945
# Enable - method
946
@dbus.service.method(_interface)
947
def Enable(self):
948
"D-Bus method"
949
self.enable()
950
951
# StartChecker - method
952
@dbus.service.method(_interface)
953
def StartChecker(self):
954
"D-Bus method"
955
self.start_checker()
956
957
# Disable - method
958
@dbus.service.method(_interface)
959
def Disable(self):
960
"D-Bus method"
961
self.disable()
962
963
# StopChecker - method
964
@dbus.service.method(_interface)
965
def StopChecker(self):
966
self.stop_checker()
967
968
## Properties
969
970
# ApprovalPending - property
971
@dbus_service_property(_interface, signature="b", access="read")
972
def ApprovalPending_dbus_property(self):
973
return dbus.Boolean(bool(self.approvals_pending))
974
975
# ApprovedByDefault - property
976
@dbus_service_property(_interface, signature="b",
977
access="readwrite")
978
def ApprovedByDefault_dbus_property(self, value=None):
979
if value is None: # get
980
return dbus.Boolean(self.approved_by_default)
981
self.approved_by_default = bool(value)
982
# Emit D-Bus signal
983
self.PropertyChanged(dbus.String("ApprovedByDefault"),
984
dbus.Boolean(value, variant_level=1))
985
986
# ApprovalDelay - property
987
@dbus_service_property(_interface, signature="t",
988
access="readwrite")
989
def ApprovalDelay_dbus_property(self, value=None):
990
if value is None: # get
991
return dbus.UInt64(self.approval_delay_milliseconds())
992
self.approval_delay = datetime.timedelta(0, 0, 0, value)
993
# Emit D-Bus signal
994
self.PropertyChanged(dbus.String("ApprovalDelay"),
995
dbus.UInt64(value, variant_level=1))
996
997
# ApprovalDuration - property
998
@dbus_service_property(_interface, signature="t",
999
access="readwrite")
1000
def ApprovalDuration_dbus_property(self, value=None):
1001
if value is None: # get
1002
return dbus.UInt64(self._timedelta_to_milliseconds(
1003
self.approval_duration))
1004
self.approval_duration = datetime.timedelta(0, 0, 0, value)
1005
# Emit D-Bus signal
1006
self.PropertyChanged(dbus.String("ApprovalDuration"),
1007
dbus.UInt64(value, variant_level=1))
1008
1009
# Name - property
1010
@dbus_service_property(_interface, signature="s", access="read")
1011
def Name_dbus_property(self):
1012
return dbus.String(self.name)
1013
1014
# Fingerprint - property
1015
@dbus_service_property(_interface, signature="s", access="read")
1016
def Fingerprint_dbus_property(self):
1017
return dbus.String(self.fingerprint)
1018
1019
# Host - property
1020
@dbus_service_property(_interface, signature="s",
1021
access="readwrite")
1022
def Host_dbus_property(self, value=None):
1023
if value is None: # get
1024
return dbus.String(self.host)
1025
self.host = value
1026
# Emit D-Bus signal
1027
self.PropertyChanged(dbus.String("Host"),
1028
dbus.String(value, variant_level=1))
1029
1030
# Created - property
1031
@dbus_service_property(_interface, signature="s", access="read")
1032
def Created_dbus_property(self):
1033
return dbus.String(self._datetime_to_dbus(self.created))
1034
1035
# LastEnabled - property
1036
@dbus_service_property(_interface, signature="s", access="read")
1037
def LastEnabled_dbus_property(self):
1038
if self.last_enabled is None:
1039
return dbus.String("")
1040
return dbus.String(self._datetime_to_dbus(self.last_enabled))
1041
1042
# Enabled - property
1043
@dbus_service_property(_interface, signature="b",
1044
access="readwrite")
1045
def Enabled_dbus_property(self, value=None):
1046
if value is None: # get
1047
return dbus.Boolean(self.enabled)
1048
if value:
1049
self.enable()
1050
else:
1051
self.disable()
1052
1053
# LastCheckedOK - property
1054
@dbus_service_property(_interface, signature="s",
1055
access="readwrite")
1056
def LastCheckedOK_dbus_property(self, value=None):
1057
if value is not None:
1058
self.checked_ok()
1059
return
366
1060
if self.last_checked_ok is None:
367
return now < (self.created + self.timeout)
368
else:
369
return now < (self.last_checked_ok + self.timeout)
370
371
372
def peer_certificate(session):
373
"Return the peer's OpenPGP certificate as a bytestring"
374
# If not an OpenPGP certificate...
375
if gnutls.library.functions.gnutls_certificate_type_get\
376
(session._c_object) \
377
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
378
# ...do the normal thing
379
return session.peer_certificate
380
list_size = ctypes.c_uint()
381
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
382
(session._c_object, ctypes.byref(list_size))
383
if list_size.value == 0:
384
return None
385
cert = cert_list[0]
386
return ctypes.string_at(cert.data, cert.size)
387
388
389
def fingerprint(openpgp):
390
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
391
# New GnuTLS "datum" with the OpenPGP public key
392
datum = gnutls.library.types.gnutls_datum_t\
393
(ctypes.cast(ctypes.c_char_p(openpgp),
394
ctypes.POINTER(ctypes.c_ubyte)),
395
ctypes.c_uint(len(openpgp)))
396
# New empty GnuTLS certificate
397
crt = gnutls.library.types.gnutls_openpgp_crt_t()
398
gnutls.library.functions.gnutls_openpgp_crt_init\
399
(ctypes.byref(crt))
400
# Import the OpenPGP public key into the certificate
401
gnutls.library.functions.gnutls_openpgp_crt_import\
402
(crt, ctypes.byref(datum),
403
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
404
# New buffer for the fingerprint
405
buffer = ctypes.create_string_buffer(20)
406
buffer_length = ctypes.c_size_t()
407
# Get the fingerprint from the certificate into the buffer
408
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
409
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
410
# Deinit the certificate
411
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
412
# Convert the buffer to a Python bytestring
413
fpr = ctypes.string_at(buffer, buffer_length.value)
414
# Convert the bytestring to hexadecimal notation
415
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
416
return hex_fpr
417
418
419
class tcp_handler(SocketServer.BaseRequestHandler, object):
420
"""A TCP request handler class.
421
Instantiated by IPv6_TCPServer for each request to handle it.
1061
return dbus.String("")
1062
return dbus.String(self._datetime_to_dbus(self
1063
.last_checked_ok))
1064
1065
# LastApprovalRequest - property
1066
@dbus_service_property(_interface, signature="s", access="read")
1067
def LastApprovalRequest_dbus_property(self):
1068
if self.last_approval_request is None:
1069
return dbus.String("")
1070
return dbus.String(self.
1071
_datetime_to_dbus(self
1072
.last_approval_request))
1073
1074
# Timeout - property
1075
@dbus_service_property(_interface, signature="t",
1076
access="readwrite")
1077
def Timeout_dbus_property(self, value=None):
1078
if value is None: # get
1079
return dbus.UInt64(self.timeout_milliseconds())
1080
self.timeout = datetime.timedelta(0, 0, 0, value)
1081
# Emit D-Bus signal
1082
self.PropertyChanged(dbus.String("Timeout"),
1083
dbus.UInt64(value, variant_level=1))
1084
if getattr(self, "disable_initiator_tag", None) is None:
1085
return
1086
# Reschedule timeout
1087
gobject.source_remove(self.disable_initiator_tag)
1088
self.disable_initiator_tag = None
1089
time_to_die = (self.
1090
_timedelta_to_milliseconds((self
1091
.last_checked_ok
1092
+ self.timeout)
1093
- datetime.datetime
1094
.utcnow()))
1095
if time_to_die <= 0:
1096
# The timeout has passed
1097
self.disable()
1098
else:
1099
self.disable_initiator_tag = (gobject.timeout_add
1100
(time_to_die, self.disable))
1101
1102
# Interval - property
1103
@dbus_service_property(_interface, signature="t",
1104
access="readwrite")
1105
def Interval_dbus_property(self, value=None):
1106
if value is None: # get
1107
return dbus.UInt64(self.interval_milliseconds())
1108
self.interval = datetime.timedelta(0, 0, 0, value)
1109
# Emit D-Bus signal
1110
self.PropertyChanged(dbus.String("Interval"),
1111
dbus.UInt64(value, variant_level=1))
1112
if getattr(self, "checker_initiator_tag", None) is None:
1113
return
1114
# Reschedule checker run
1115
gobject.source_remove(self.checker_initiator_tag)
1116
self.checker_initiator_tag = (gobject.timeout_add
1117
(value, self.start_checker))
1118
self.start_checker() # Start one now, too
1119
1120
# Checker - property
1121
@dbus_service_property(_interface, signature="s",
1122
access="readwrite")
1123
def Checker_dbus_property(self, value=None):
1124
if value is None: # get
1125
return dbus.String(self.checker_command)
1126
self.checker_command = value
1127
# Emit D-Bus signal
1128
self.PropertyChanged(dbus.String("Checker"),
1129
dbus.String(self.checker_command,
1130
variant_level=1))
1131
1132
# CheckerRunning - property
1133
@dbus_service_property(_interface, signature="b",
1134
access="readwrite")
1135
def CheckerRunning_dbus_property(self, value=None):
1136
if value is None: # get
1137
return dbus.Boolean(self.checker is not None)
1138
if value:
1139
self.start_checker()
1140
else:
1141
self.stop_checker()
1142
1143
# ObjectPath - property
1144
@dbus_service_property(_interface, signature="o", access="read")
1145
def ObjectPath_dbus_property(self):
1146
return self.dbus_object_path # is already a dbus.ObjectPath
1147
1148
# Secret = property
1149
@dbus_service_property(_interface, signature="ay",
1150
access="write", byte_arrays=True)
1151
def Secret_dbus_property(self, value):
1152
self.secret = str(value)
1153
1154
del _interface
1155
1156
1157
class ProxyClient(object):
1158
def __init__(self, child_pipe, fpr, address):
1159
self._pipe = child_pipe
1160
self._pipe.send(('init', fpr, address))
1161
if not self._pipe.recv():
1162
raise KeyError()
1163
1164
def __getattribute__(self, name):
1165
if(name == '_pipe'):
1166
return super(ProxyClient, self).__getattribute__(name)
1167
self._pipe.send(('getattr', name))
1168
data = self._pipe.recv()
1169
if data[0] == 'data':
1170
return data[1]
1171
if data[0] == 'function':
1172
def func(*args, **kwargs):
1173
self._pipe.send(('funcall', name, args, kwargs))
1174
return self._pipe.recv()[1]
1175
return func
1176
1177
def __setattr__(self, name, value):
1178
if(name == '_pipe'):
1179
return super(ProxyClient, self).__setattr__(name, value)
1180
self._pipe.send(('setattr', name, value))
1181
1182
1183
class ClientHandler(socketserver.BaseRequestHandler, object):
1184
"""A class to handle client connections.
1185
1186
Instantiated once for each connection to handle it.
422
1187
Note: This will run in its own forked process."""
423
1188
424
1189
def handle(self):
425
logger.info(u"TCP connection from: %s",
426
unicode(self.client_address))
427
session = gnutls.connection.ClientSession\
428
(self.request, gnutls.connection.X509Credentials())
429
430
line = self.request.makefile().readline()
431
logger.debug(u"Protocol version: %r", line)
432
try:
433
if int(line.strip().split()[0]) > 1:
434
raise RuntimeError
435
except (ValueError, IndexError, RuntimeError), error:
436
logger.error(u"Unknown protocol version: %s", error)
437
return
438
439
# Note: gnutls.connection.X509Credentials is really a generic
440
# GnuTLS certificate credentials object so long as no X.509
441
# keys are added to it. Therefore, we can use it here despite
442
# using OpenPGP certificates.
443
444
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
445
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
446
# "+DHE-DSS"))
447
priority = "NORMAL" # Fallback default, since this
448
# MUST be set.
449
if self.server.settings["priority"]:
450
priority = self.server.settings["priority"]
451
gnutls.library.functions.gnutls_priority_set_direct\
452
(session._c_object, priority, None);
453
454
try:
455
session.handshake()
456
except gnutls.errors.GNUTLSError, error:
457
logger.warning(u"Handshake failed: %s", error)
458
# Do not run session.bye() here: the session is not
459
# established. Just abandon the request.
460
return
461
try:
462
fpr = fingerprint(peer_certificate(session))
463
except (TypeError, gnutls.errors.GNUTLSError), error:
464
logger.warning(u"Bad certificate: %s", error)
465
session.bye()
466
return
467
logger.debug(u"Fingerprint: %s", fpr)
468
client = None
469
for c in self.server.clients:
470
if c.fingerprint == fpr:
471
client = c
472
break
473
if not client:
474
logger.warning(u"Client not found for fingerprint: %s",
475
fpr)
476
session.bye()
477
return
478
# Have to check if client.still_valid(), since it is possible
479
# that the client timed out while establishing the GnuTLS
480
# session.
481
if not client.still_valid():
482
logger.warning(u"Client %(name)s is invalid",
483
vars(client))
484
session.bye()
485
return
486
sent_size = 0
487
while sent_size < len(client.secret):
488
sent = session.send(client.secret[sent_size:])
489
logger.debug(u"Sent: %d, remaining: %d",
490
sent, len(client.secret)
491
- (sent_size + sent))
492
sent_size += sent
493
session.bye()
494
495
496
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
497
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1190
with contextlib.closing(self.server.child_pipe) as child_pipe:
1191
logger.info("TCP connection from: %s",
1192
unicode(self.client_address))
1193
logger.debug("Pipe FD: %d",
1194
self.server.child_pipe.fileno())
1195
1196
session = (gnutls.connection
1197
.ClientSession(self.request,
1198
gnutls.connection
1199
.X509Credentials()))
1200
1201
# Note: gnutls.connection.X509Credentials is really a
1202
# generic GnuTLS certificate credentials object so long as
1203
# no X.509 keys are added to it. Therefore, we can use it
1204
# here despite using OpenPGP certificates.
1205
1206
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
1207
# "+AES-256-CBC", "+SHA1",
1208
# "+COMP-NULL", "+CTYPE-OPENPGP",
1209
# "+DHE-DSS"))
1210
# Use a fallback default, since this MUST be set.
1211
priority = self.server.gnutls_priority
1212
if priority is None:
1213
priority = "NORMAL"
1214
(gnutls.library.functions
1215
.gnutls_priority_set_direct(session._c_object,
1216
priority, None))
1217
1218
# Start communication using the Mandos protocol
1219
# Get protocol number
1220
line = self.request.makefile().readline()
1221
logger.debug("Protocol version: %r", line)
1222
try:
1223
if int(line.strip().split()[0]) > 1:
1224
raise RuntimeError
1225
except (ValueError, IndexError, RuntimeError) as error:
1226
logger.error("Unknown protocol version: %s", error)
1227
return
1228
1229
# Start GnuTLS connection
1230
try:
1231
session.handshake()
1232
except gnutls.errors.GNUTLSError as error:
1233
logger.warning("Handshake failed: %s", error)
1234
# Do not run session.bye() here: the session is not
1235
# established. Just abandon the request.
1236
return
1237
logger.debug("Handshake succeeded")
1238
1239
approval_required = False
1240
try:
1241
try:
1242
fpr = self.fingerprint(self.peer_certificate
1243
(session))
1244
except (TypeError,
1245
gnutls.errors.GNUTLSError) as error:
1246
logger.warning("Bad certificate: %s", error)
1247
return
1248
logger.debug("Fingerprint: %s", fpr)
1249
1250
try:
1251
client = ProxyClient(child_pipe, fpr,
1252
self.client_address)
1253
except KeyError:
1254
return
1255
1256
if client.approval_delay:
1257
delay = client.approval_delay
1258
client.approvals_pending += 1
1259
approval_required = True
1260
1261
while True:
1262
if not client.enabled:
1263
logger.warning("Client %s is disabled",
1264
client.name)
1265
if self.server.use_dbus:
1266
# Emit D-Bus signal
1267
client.Rejected("Disabled")
1268
return
1269
1270
if client._approved or not client.approval_delay:
1271
#We are approved or approval is disabled
1272
break
1273
elif client._approved is None:
1274
logger.info("Client %s needs approval",
1275
client.name)
1276
if self.server.use_dbus:
1277
# Emit D-Bus signal
1278
client.NeedApproval(
1279
client.approval_delay_milliseconds(),
1280
client.approved_by_default)
1281
else:
1282
logger.warning("Client %s was not approved",
1283
client.name)
1284
if self.server.use_dbus:
1285
# Emit D-Bus signal
1286
client.Rejected("Denied")
1287
return
1288
1289
#wait until timeout or approved
1290
#x = float(client._timedelta_to_milliseconds(delay))
1291
time = datetime.datetime.now()
1292
client.changedstate.acquire()
1293
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1294
client.changedstate.release()
1295
time2 = datetime.datetime.now()
1296
if (time2 - time) >= delay:
1297
if not client.approved_by_default:
1298
logger.warning("Client %s timed out while"
1299
" waiting for approval",
1300
client.name)
1301
if self.server.use_dbus:
1302
# Emit D-Bus signal
1303
client.Rejected("Approval timed out")
1304
return
1305
else:
1306
break
1307
else:
1308
delay -= time2 - time
1309
1310
sent_size = 0
1311
while sent_size < len(client.secret):
1312
try:
1313
sent = session.send(client.secret[sent_size:])
1314
except gnutls.errors.GNUTLSError as error:
1315
logger.warning("gnutls send failed")
1316
return
1317
logger.debug("Sent: %d, remaining: %d",
1318
sent, len(client.secret)
1319
- (sent_size + sent))
1320
sent_size += sent
1321
1322
logger.info("Sending secret to %s", client.name)
1323
# bump the timeout as if seen
1324
client.checked_ok()
1325
if self.server.use_dbus:
1326
# Emit D-Bus signal
1327
client.GotSecret()
1328
1329
finally:
1330
if approval_required:
1331
client.approvals_pending -= 1
1332
try:
1333
session.bye()
1334
except gnutls.errors.GNUTLSError as error:
1335
logger.warning("GnuTLS bye failed")
1336
1337
@staticmethod
1338
def peer_certificate(session):
1339
"Return the peer's OpenPGP certificate as a bytestring"
1340
# If not an OpenPGP certificate...
1341
if (gnutls.library.functions
1342
.gnutls_certificate_type_get(session._c_object)
1343
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1344
# ...do the normal thing
1345
return session.peer_certificate
1346
list_size = ctypes.c_uint(1)
1347
cert_list = (gnutls.library.functions
1348
.gnutls_certificate_get_peers
1349
(session._c_object, ctypes.byref(list_size)))
1350
if not bool(cert_list) and list_size.value != 0:
1351
raise gnutls.errors.GNUTLSError("error getting peer"
1352
" certificate")
1353
if list_size.value == 0:
1354
return None
1355
cert = cert_list[0]
1356
return ctypes.string_at(cert.data, cert.size)
1357
1358
@staticmethod
1359
def fingerprint(openpgp):
1360
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1361
# New GnuTLS "datum" with the OpenPGP public key
1362
datum = (gnutls.library.types
1363
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1364
ctypes.POINTER
1365
(ctypes.c_ubyte)),
1366
ctypes.c_uint(len(openpgp))))
1367
# New empty GnuTLS certificate
1368
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1369
(gnutls.library.functions
1370
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1371
# Import the OpenPGP public key into the certificate
1372
(gnutls.library.functions
1373
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1374
gnutls.library.constants
1375
.GNUTLS_OPENPGP_FMT_RAW))
1376
# Verify the self signature in the key
1377
crtverify = ctypes.c_uint()
1378
(gnutls.library.functions
1379
.gnutls_openpgp_crt_verify_self(crt, 0,
1380
ctypes.byref(crtverify)))
1381
if crtverify.value != 0:
1382
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1383
raise (gnutls.errors.CertificateSecurityError
1384
("Verify failed"))
1385
# New buffer for the fingerprint
1386
buf = ctypes.create_string_buffer(20)
1387
buf_len = ctypes.c_size_t()
1388
# Get the fingerprint from the certificate into the buffer
1389
(gnutls.library.functions
1390
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1391
ctypes.byref(buf_len)))
1392
# Deinit the certificate
1393
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1394
# Convert the buffer to a Python bytestring
1395
fpr = ctypes.string_at(buf, buf_len.value)
1396
# Convert the bytestring to hexadecimal notation
1397
hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1398
return hex_fpr
1399
1400
1401
class MultiprocessingMixIn(object):
1402
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1403
def sub_process_main(self, request, address):
1404
try:
1405
self.finish_request(request, address)
1406
except:
1407
self.handle_error(request, address)
1408
self.close_request(request)
1409
1410
def process_request(self, request, address):
1411
"""Start a new process to process the request."""
1412
multiprocessing.Process(target = self.sub_process_main,
1413
args = (request, address)).start()
1414
1415
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1416
""" adds a pipe to the MixIn """
1417
def process_request(self, request, client_address):
1418
"""Overrides and wraps the original process_request().
1419
1420
This function creates a new pipe in self.pipe
1421
"""
1422
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1423
1424
super(MultiprocessingMixInWithPipe,
1425
self).process_request(request, client_address)
1426
self.child_pipe.close()
1427
self.add_pipe(parent_pipe)
1428
1429
def add_pipe(self, parent_pipe):
1430
"""Dummy function; override as necessary"""
1431
raise NotImplementedError
1432
1433
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1434
socketserver.TCPServer, object):
1435
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1436
498
1437
Attributes:
499
settings: Server settings
500
clients: Set() of Client objects
1438
enabled: Boolean; whether this server is activated yet
1439
interface: None or a network interface name (string)
1440
use_ipv6: Boolean; to use IPv6 or not
501
1441
"""
502
address_family = socket.AF_INET6
503
def __init__(self, *args, **kwargs):
504
if "settings" in kwargs:
505
self.settings = kwargs["settings"]
506
del kwargs["settings"]
507
if "clients" in kwargs:
508
self.clients = kwargs["clients"]
509
del kwargs["clients"]
510
return super(type(self), self).__init__(*args, **kwargs)
1442
def __init__(self, server_address, RequestHandlerClass,
1443
interface=None, use_ipv6=True):
1444
self.interface = interface
1445
if use_ipv6:
1446
self.address_family = socket.AF_INET6
1447
socketserver.TCPServer.__init__(self, server_address,
1448
RequestHandlerClass)
511
1449
def server_bind(self):
512
1450
"""This overrides the normal server_bind() function
513
1451
to bind to an interface if one was specified, and also NOT to
514
1452
bind to an address or port if they were not specified."""
515
if self.settings["interface"]:
516
# 25 is from /usr/include/asm-i486/socket.h
517
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
518
try:
519
self.socket.setsockopt(socket.SOL_SOCKET,
520
SO_BINDTODEVICE,
521
self.settings["interface"])
522
except socket.error, error:
523
if error[0] == errno.EPERM:
524
logger.error(u"No permission to"
525
u" bind to interface %s",
526
self.settings["interface"])
527
else:
528
raise error
1453
if self.interface is not None:
1454
if SO_BINDTODEVICE is None:
1455
logger.error("SO_BINDTODEVICE does not exist;"
1456
" cannot bind to interface %s",
1457
self.interface)
1458
else:
1459
try:
1460
self.socket.setsockopt(socket.SOL_SOCKET,
1461
SO_BINDTODEVICE,
1462
str(self.interface
1463
+ '\0'))
1464
except socket.error as error:
1465
if error[0] == errno.EPERM:
1466
logger.error("No permission to"
1467
" bind to interface %s",
1468
self.interface)
1469
elif error[0] == errno.ENOPROTOOPT:
1470
logger.error("SO_BINDTODEVICE not available;"
1471
" cannot bind to interface %s",
1472
self.interface)
1473
else:
1474
raise
529
1475
# Only bind(2) the socket if we really need to.
530
1476
if self.server_address[0] or self.server_address[1]:
531
1477
if not self.server_address[0]:
532
in6addr_any = "::"
533
self.server_address = (in6addr_any,
1478
if self.address_family == socket.AF_INET6:
1479
any_address = "::" # in6addr_any
1480
else:
1481
any_address = socket.INADDR_ANY
1482
self.server_address = (any_address,
534
1483
self.server_address[1])
535
1484
elif not self.server_address[1]:
536
1485
self.server_address = (self.server_address[0],
537
1486
0)
538
# if self.settings["interface"]:
1487
# if self.interface:
539
1488
# self.server_address = (self.server_address[0],
540
1489
# 0, # port
541
1490
# 0, # flowinfo
542
1491
# if_nametoindex
543
# (self.settings
544
# ["interface"]))
545
return super(type(self), self).server_bind()
1492
# (self.interface))
1493
return socketserver.TCPServer.server_bind(self)
1494
1495
1496
class MandosServer(IPv6_TCPServer):
1497
"""Mandos server.
1498
1499
Attributes:
1500
clients: set of Client objects
1501
gnutls_priority GnuTLS priority string
1502
use_dbus: Boolean; to emit D-Bus signals or not
1503
1504
Assumes a gobject.MainLoop event loop.
1505
"""
1506
def __init__(self, server_address, RequestHandlerClass,
1507
interface=None, use_ipv6=True, clients=None,
1508
gnutls_priority=None, use_dbus=True):
1509
self.enabled = False
1510
self.clients = clients
1511
if self.clients is None:
1512
self.clients = set()
1513
self.use_dbus = use_dbus
1514
self.gnutls_priority = gnutls_priority
1515
IPv6_TCPServer.__init__(self, server_address,
1516
RequestHandlerClass,
1517
interface = interface,
1518
use_ipv6 = use_ipv6)
1519
def server_activate(self):
1520
if self.enabled:
1521
return socketserver.TCPServer.server_activate(self)
1522
def enable(self):
1523
self.enabled = True
1524
def add_pipe(self, parent_pipe):
1525
# Call "handle_ipc" for both data and EOF events
1526
gobject.io_add_watch(parent_pipe.fileno(),
1527
gobject.IO_IN | gobject.IO_HUP,
1528
functools.partial(self.handle_ipc,
1529
parent_pipe = parent_pipe))
1530
1531
def handle_ipc(self, source, condition, parent_pipe=None,
1532
client_object=None):
1533
condition_names = {
1534
gobject.IO_IN: "IN", # There is data to read.
1535
gobject.IO_OUT: "OUT", # Data can be written (without
1536
# blocking).
1537
gobject.IO_PRI: "PRI", # There is urgent data to read.
1538
gobject.IO_ERR: "ERR", # Error condition.
1539
gobject.IO_HUP: "HUP" # Hung up (the connection has been
1540
# broken, usually for pipes and
1541
# sockets).
1542
}
1543
conditions_string = ' | '.join(name
1544
for cond, name in
1545
condition_names.iteritems()
1546
if cond & condition)
1547
# error or the other end of multiprocessing.Pipe has closed
1548
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1549
return False
1550
1551
# Read a request from the child
1552
request = parent_pipe.recv()
1553
command = request[0]
1554
1555
if command == 'init':
1556
fpr = request[1]
1557
address = request[2]
1558
1559
for c in self.clients:
1560
if c.fingerprint == fpr:
1561
client = c
1562
break
1563
else:
1564
logger.warning("Client not found for fingerprint: %s, ad"
1565
"dress: %s", fpr, address)
1566
if self.use_dbus:
1567
# Emit D-Bus signal
1568
mandos_dbus_service.ClientNotFound(fpr, address[0])
1569
parent_pipe.send(False)
1570
return False
1571
1572
gobject.io_add_watch(parent_pipe.fileno(),
1573
gobject.IO_IN | gobject.IO_HUP,
1574
functools.partial(self.handle_ipc,
1575
parent_pipe = parent_pipe,
1576
client_object = client))
1577
parent_pipe.send(True)
1578
# remove the old hook in favor of the new above hook on same fileno
1579
return False
1580
if command == 'funcall':
1581
funcname = request[1]
1582
args = request[2]
1583
kwargs = request[3]
1584
1585
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1586
1587
if command == 'getattr':
1588
attrname = request[1]
1589
if callable(client_object.__getattribute__(attrname)):
1590
parent_pipe.send(('function',))
1591
else:
1592
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1593
1594
if command == 'setattr':
1595
attrname = request[1]
1596
value = request[2]
1597
setattr(client_object, attrname, value)
1598
1599
return True
546
1600
547
1601
548
1602
def string_to_delta(interval):
549
1603
"""Parse a string and return a datetime.timedelta
550
1604
551
1605
>>> string_to_delta('7d')
552
1606
datetime.timedelta(7)
553
1607
>>> string_to_delta('60s')
556
1610
datetime.timedelta(0, 3600)
557
1611
>>> string_to_delta('24h')
558
1612
datetime.timedelta(1)
559
>>> string_to_delta(u'1w')
1613
>>> string_to_delta('1w')
560
1614
datetime.timedelta(7)
1615
>>> string_to_delta('5m 30s')
1616
datetime.timedelta(0, 330)
561
1617
"""
562
try:
563
suffix=unicode(interval[-1])
564
value=int(interval[:-1])
565
if suffix == u"d":
566
delta = datetime.timedelta(value)
567
elif suffix == u"s":
568
delta = datetime.timedelta(0, value)
569
elif suffix == u"m":
570
delta = datetime.timedelta(0, 0, 0, 0, value)
571
elif suffix == u"h":
572
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
573
elif suffix == u"w":
574
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
575
else:
576
raise ValueError
577
except (ValueError, IndexError):
578
raise ValueError
579
return delta
580
581
582
def server_state_changed(state):
583
"""Derived from the Avahi example code"""
584
if state == avahi.SERVER_COLLISION:
585
logger.error(u"Server name collision")
586
service.remove()
587
elif state == avahi.SERVER_RUNNING:
588
service.add()
589
590
591
def entry_group_state_changed(state, error):
592
"""Derived from the Avahi example code"""
593
logger.debug(u"state change: %i", state)
594
595
if state == avahi.ENTRY_GROUP_ESTABLISHED:
596
logger.debug(u"Service established.")
597
elif state == avahi.ENTRY_GROUP_COLLISION:
598
logger.warning(u"Service name collision.")
599
service.rename()
600
elif state == avahi.ENTRY_GROUP_FAILURE:
601
logger.critical(u"Error in group state changed %s",
602
unicode(error))
603
raise AvahiGroupError("State changed: %s", str(error))
1618
timevalue = datetime.timedelta(0)
1619
for s in interval.split():
1620
try:
1621
suffix = unicode(s[-1])
1622
value = int(s[:-1])
1623
if suffix == "d":
1624
delta = datetime.timedelta(value)
1625
elif suffix == "s":
1626
delta = datetime.timedelta(0, value)
1627
elif suffix == "m":
1628
delta = datetime.timedelta(0, 0, 0, 0, value)
1629
elif suffix == "h":
1630
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1631
elif suffix == "w":
1632
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1633
else:
1634
raise ValueError("Unknown suffix %r" % suffix)
1635
except (ValueError, IndexError) as e:
1636
raise ValueError(*(e.args))
1637
timevalue += delta
1638
return timevalue
1639
604
1640
605
1641
def if_nametoindex(interface):
606
"""Call the C function if_nametoindex(), or equivalent"""
1642
"""Call the C function if_nametoindex(), or equivalent
1643
1644
Note: This function cannot accept a unicode string."""
607
1645
global if_nametoindex
608
1646
try:
609
if "ctypes.util" not in sys.modules:
610
import ctypes.util
611
if_nametoindex = ctypes.cdll.LoadLibrary\
612
(ctypes.util.find_library("c")).if_nametoindex
1647
if_nametoindex = (ctypes.cdll.LoadLibrary
1648
(ctypes.util.find_library("c"))
1649
.if_nametoindex)
613
1650
except (OSError, AttributeError):
614
if "struct" not in sys.modules:
615
import struct
616
if "fcntl" not in sys.modules:
617
import fcntl
1651
logger.warning("Doing if_nametoindex the hard way")
618
1652
def if_nametoindex(interface):
619
1653
"Get an interface index the hard way, i.e. using fcntl()"
620
1654
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
621
s = socket.socket()
622
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
623
struct.pack("16s16x", interface))
624
s.close()
625
interface_index = struct.unpack("I", ifreq[16:20])[0]
1655
with contextlib.closing(socket.socket()) as s:
1656
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1657
struct.pack(str("16s16x"),
1658
interface))
1659
interface_index = struct.unpack(str("I"),
1660
ifreq[16:20])[0]
626
1661
return interface_index
627
1662
return if_nametoindex(interface)
628
1663
629
1664
630
1665
def daemon(nochdir = False, noclose = False):
631
1666
"""See daemon(3). Standard BSD Unix function.
1667
632
1668
This should really exist as os.daemon, but it doesn't (yet)."""
633
1669
if os.fork():
634
1670
sys.exit()
642
1678
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
643
1679
if not stat.S_ISCHR(os.fstat(null).st_mode):
644
1680
raise OSError(errno.ENODEV,
645
"/dev/null not a character device")
1681
"%s not a character device"
1682
% os.path.devnull)
646
1683
os.dup2(null, sys.stdin.fileno())
647
1684
os.dup2(null, sys.stdout.fileno())
648
1685
os.dup2(null, sys.stderr.fileno())
651
1688
652
1689
653
1690
def main():
654
global main_loop_started
655
main_loop_started = False
656
657
parser = OptionParser(version = "Mandos server %s" % version)
658
parser.add_option("-i", "--interface", type="string",
659
metavar="IF", help="Bind to interface IF")
660
parser.add_option("-a", "--address", type="string",
661
help="Address to listen for requests on")
662
parser.add_option("-p", "--port", type="int",
663
help="Port number to receive requests on")
664
parser.add_option("--check", action="store_true", default=False,
665
help="Run self-test")
666
parser.add_option("--debug", action="store_true",
667
help="Debug mode; run in foreground and log to"
668
" terminal")
669
parser.add_option("--priority", type="string", help="GnuTLS"
670
" priority string (see GnuTLS documentation)")
671
parser.add_option("--servicename", type="string", metavar="NAME",
672
help="Zeroconf service name")
673
parser.add_option("--configdir", type="string",
674
default="/etc/mandos", metavar="DIR",
675
help="Directory to search for configuration"
676
" files")
677
(options, args) = parser.parse_args()
1691
1692
##################################################################
1693
# Parsing of options, both command line and config file
1694
1695
parser = argparse.ArgumentParser()
1696
parser.add_argument("-v", "--version", action="version",
1697
version = "%%(prog)s %s" % version,
1698
help="show version number and exit")
1699
parser.add_argument("-i", "--interface", metavar="IF",
1700
help="Bind to interface IF")
1701
parser.add_argument("-a", "--address",
1702
help="Address to listen for requests on")
1703
parser.add_argument("-p", "--port", type=int,
1704
help="Port number to receive requests on")
1705
parser.add_argument("--check", action="store_true",
1706
help="Run self-test")
1707
parser.add_argument("--debug", action="store_true",
1708
help="Debug mode; run in foreground and log"
1709
" to terminal")
1710
parser.add_argument("--debuglevel", metavar="LEVEL",
1711
help="Debug level for stdout output")
1712
parser.add_argument("--priority", help="GnuTLS"
1713
" priority string (see GnuTLS documentation)")
1714
parser.add_argument("--servicename",
1715
metavar="NAME", help="Zeroconf service name")
1716
parser.add_argument("--configdir",
1717
default="/etc/mandos", metavar="DIR",
1718
help="Directory to search for configuration"
1719
" files")
1720
parser.add_argument("--no-dbus", action="store_false",
1721
dest="use_dbus", help="Do not provide D-Bus"
1722
" system bus interface")
1723
parser.add_argument("--no-ipv6", action="store_false",
1724
dest="use_ipv6", help="Do not use IPv6")
1725
options = parser.parse_args()
678
1726
679
1727
if options.check:
680
1728
import doctest
689
1737
"priority":
690
1738
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
691
1739
"servicename": "Mandos",
1740
"use_dbus": "True",
1741
"use_ipv6": "True",
1742
"debuglevel": "",
692
1743
}
693
1744
694
1745
# Parse config file for server-global settings
695
server_config = ConfigParser.SafeConfigParser(server_defaults)
1746
server_config = configparser.SafeConfigParser(server_defaults)
696
1747
del server_defaults
697
server_config.read(os.path.join(options.configdir, "mandos.conf"))
698
server_section = "server"
1748
server_config.read(os.path.join(options.configdir,
1749
"mandos.conf"))
699
1750
# Convert the SafeConfigParser object to a dict
700
server_settings = dict(server_config.items(server_section))
701
# Use getboolean on the boolean config option
702
server_settings["debug"] = server_config.getboolean\
703
(server_section, "debug")
1751
server_settings = server_config.defaults()
1752
# Use the appropriate methods on the non-string config options
1753
for option in ("debug", "use_dbus", "use_ipv6"):
1754
server_settings[option] = server_config.getboolean("DEFAULT",
1755
option)
1756
if server_settings["port"]:
1757
server_settings["port"] = server_config.getint("DEFAULT",
1758
"port")
704
1759
del server_config
705
1760
706
1761
# Override the settings from the config file with command line
707
1762
# options, if set.
708
1763
for option in ("interface", "address", "port", "debug",
709
"priority", "servicename", "configdir"):
1764
"priority", "servicename", "configdir",
1765
"use_dbus", "use_ipv6", "debuglevel"):
710
1766
value = getattr(options, option)
711
1767
if value is not None:
712
1768
server_settings[option] = value
713
1769
del options
1770
# Force all strings to be unicode
1771
for option in server_settings.keys():
1772
if type(server_settings[option]) is str:
1773
server_settings[option] = unicode(server_settings[option])
714
1774
# Now we have our good server settings in "server_settings"
715
1775
1776
##################################################################
1777
1778
# For convenience
716
1779
debug = server_settings["debug"]
717
718
if not debug:
719
syslogger.setLevel(logging.WARNING)
720
1780
debuglevel = server_settings["debuglevel"]
1781
use_dbus = server_settings["use_dbus"]
1782
use_ipv6 = server_settings["use_ipv6"]
1783
721
1784
if server_settings["servicename"] != "Mandos":
722
syslogger.setFormatter(logging.Formatter\
723
('Mandos (%s): %%(levelname)s:'
724
' %%(message)s'
1785
syslogger.setFormatter(logging.Formatter
1786
('Mandos (%s) [%%(process)d]:'
1787
' %%(levelname)s: %%(message)s'
725
1788
% server_settings["servicename"]))
726
1789
727
1790
# Parse config file with clients
728
1791
client_defaults = { "timeout": "1h",
729
1792
"interval": "5m",
730
1793
"checker": "fping -q -- %%(host)s",
1794
"host": "",
1795
"approval_delay": "0s",
1796
"approval_duration": "1s",
731
1797
}
732
client_config = ConfigParser.SafeConfigParser(client_defaults)
1798
client_config = configparser.SafeConfigParser(client_defaults)
733
1799
client_config.read(os.path.join(server_settings["configdir"],
734
1800
"clients.conf"))
735
1801
736
global service
737
service = AvahiService(name = server_settings["servicename"],
738
type = "_mandos._tcp", );
739
if server_settings["interface"]:
740
service.interface = if_nametoindex(server_settings["interface"])
1802
global mandos_dbus_service
1803
mandos_dbus_service = None
1804
1805
tcp_server = MandosServer((server_settings["address"],
1806
server_settings["port"]),
1807
ClientHandler,
1808
interface=(server_settings["interface"]
1809
or None),
1810
use_ipv6=use_ipv6,
1811
gnutls_priority=
1812
server_settings["priority"],
1813
use_dbus=use_dbus)
1814
if not debug:
1815
pidfilename = "/var/run/mandos.pid"
1816
try:
1817
pidfile = open(pidfilename, "w")
1818
except IOError:
1819
logger.error("Could not open file %r", pidfilename)
1820
1821
try:
1822
uid = pwd.getpwnam("_mandos").pw_uid
1823
gid = pwd.getpwnam("_mandos").pw_gid
1824
except KeyError:
1825
try:
1826
uid = pwd.getpwnam("mandos").pw_uid
1827
gid = pwd.getpwnam("mandos").pw_gid
1828
except KeyError:
1829
try:
1830
uid = pwd.getpwnam("nobody").pw_uid
1831
gid = pwd.getpwnam("nobody").pw_gid
1832
except KeyError:
1833
uid = 65534
1834
gid = 65534
1835
try:
1836
os.setgid(gid)
1837
os.setuid(uid)
1838
except OSError as error:
1839
if error[0] != errno.EPERM:
1840
raise error
1841
1842
if not debug and not debuglevel:
1843
syslogger.setLevel(logging.WARNING)
1844
console.setLevel(logging.WARNING)
1845
if debuglevel:
1846
level = getattr(logging, debuglevel.upper())
1847
syslogger.setLevel(level)
1848
console.setLevel(level)
1849
1850
if debug:
1851
# Enable all possible GnuTLS debugging
1852
1853
# "Use a log level over 10 to enable all debugging options."
1854
# - GnuTLS manual
1855
gnutls.library.functions.gnutls_global_set_log_level(11)
1856
1857
@gnutls.library.types.gnutls_log_func
1858
def debug_gnutls(level, string):
1859
logger.debug("GnuTLS: %s", string[:-1])
1860
1861
(gnutls.library.functions
1862
.gnutls_global_set_log_function(debug_gnutls))
1863
1864
# Redirect stdin so all checkers get /dev/null
1865
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1866
os.dup2(null, sys.stdin.fileno())
1867
if null > 2:
1868
os.close(null)
1869
else:
1870
# No console logging
1871
logger.removeHandler(console)
1872
1873
# Need to fork before connecting to D-Bus
1874
if not debug:
1875
# Close all input and output, do double fork, etc.
1876
daemon()
741
1877
742
1878
global main_loop
743
global bus
744
global server
745
1879
# From the Avahi example code
746
1880
DBusGMainLoop(set_as_default=True )
747
1881
main_loop = gobject.MainLoop()
748
1882
bus = dbus.SystemBus()
749
server = dbus.Interface(
750
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
751
avahi.DBUS_INTERFACE_SERVER )
752
1883
# End of Avahi example code
753
754
if debug:
755
console = logging.StreamHandler()
756
# console.setLevel(logging.DEBUG)
757
console.setFormatter(logging.Formatter\
758
('%(levelname)s: %(message)s'))
759
logger.addHandler(console)
760
del console
761
762
clients = Set()
763
def remove_from_clients(client):
764
clients.remove(client)
765
if not clients:
766
logger.critical(u"No clients left, exiting")
767
sys.exit()
768
769
clients.update(Set(Client(name = section,
770
stop_hook = remove_from_clients,
771
config
772
= dict(client_config.items(section)))
773
for section in client_config.sections()))
774
if not clients:
775
logger.critical(u"No clients defined")
776
sys.exit(1)
777
1884
if use_dbus:
1885
try:
1886
bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1887
bus, do_not_queue=True)
1888
except dbus.exceptions.NameExistsException as e:
1889
logger.error(unicode(e) + ", disabling D-Bus")
1890
use_dbus = False
1891
server_settings["use_dbus"] = False
1892
tcp_server.use_dbus = False
1893
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1894
service = AvahiService(name = server_settings["servicename"],
1895
servicetype = "_mandos._tcp",
1896
protocol = protocol, bus = bus)
1897
if server_settings["interface"]:
1898
service.interface = (if_nametoindex
1899
(str(server_settings["interface"])))
1900
1901
global multiprocessing_manager
1902
multiprocessing_manager = multiprocessing.Manager()
1903
1904
client_class = Client
1905
if use_dbus:
1906
client_class = functools.partial(ClientDBus, bus = bus)
1907
def client_config_items(config, section):
1908
special_settings = {
1909
"approved_by_default":
1910
lambda: config.getboolean(section,
1911
"approved_by_default"),
1912
}
1913
for name, value in config.items(section):
1914
try:
1915
yield (name, special_settings[name]())
1916
except KeyError:
1917
yield (name, value)
1918
1919
tcp_server.clients.update(set(
1920
client_class(name = section,
1921
config= dict(client_config_items(
1922
client_config, section)))
1923
for section in client_config.sections()))
1924
if not tcp_server.clients:
1925
logger.warning("No clients defined")
1926
778
1927
if not debug:
779
daemon()
1928
try:
1929
with pidfile:
1930
pid = os.getpid()
1931
pidfile.write(str(pid) + "\n".encode("utf-8"))
1932
del pidfile
1933
except IOError:
1934
logger.error("Could not write to file %r with PID %d",
1935
pidfilename, pid)
1936
except NameError:
1937
# "pidfile" was never created
1938
pass
1939
del pidfilename
1940
1941
signal.signal(signal.SIGINT, signal.SIG_IGN)
1942
1943
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1944
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
780
1945
781
pidfilename = "/var/run/mandos/mandos.pid"
782
pid = os.getpid()
783
try:
784
pidfile = open(pidfilename, "w")
785
pidfile.write(str(pid) + "\n")
786
pidfile.close()
787
del pidfile
788
except IOError, err:
789
logger.error(u"Could not write %s file with PID %d",
790
pidfilename, os.getpid())
1946
if use_dbus:
1947
class MandosDBusService(dbus.service.Object):
1948
"""A D-Bus proxy object"""
1949
def __init__(self):
1950
dbus.service.Object.__init__(self, bus, "/")
1951
_interface = "se.bsnet.fukt.Mandos"
1952
1953
@dbus.service.signal(_interface, signature="o")
1954
def ClientAdded(self, objpath):
1955
"D-Bus signal"
1956
pass
1957
1958
@dbus.service.signal(_interface, signature="ss")
1959
def ClientNotFound(self, fingerprint, address):
1960
"D-Bus signal"
1961
pass
1962
1963
@dbus.service.signal(_interface, signature="os")
1964
def ClientRemoved(self, objpath, name):
1965
"D-Bus signal"
1966
pass
1967
1968
@dbus.service.method(_interface, out_signature="ao")
1969
def GetAllClients(self):
1970
"D-Bus method"
1971
return dbus.Array(c.dbus_object_path
1972
for c in tcp_server.clients)
1973
1974
@dbus.service.method(_interface,
1975
out_signature="a{oa{sv}}")
1976
def GetAllClientsWithProperties(self):
1977
"D-Bus method"
1978
return dbus.Dictionary(
1979
((c.dbus_object_path, c.GetAll(""))
1980
for c in tcp_server.clients),
1981
signature="oa{sv}")
1982
1983
@dbus.service.method(_interface, in_signature="o")
1984
def RemoveClient(self, object_path):
1985
"D-Bus method"
1986
for c in tcp_server.clients:
1987
if c.dbus_object_path == object_path:
1988
tcp_server.clients.remove(c)
1989
c.remove_from_connection()
1990
# Don't signal anything except ClientRemoved
1991
c.disable(quiet=True)
1992
# Emit D-Bus signal
1993
self.ClientRemoved(object_path, c.name)
1994
return
1995
raise KeyError(object_path)
1996
1997
del _interface
1998
1999
mandos_dbus_service = MandosDBusService()
791
2000
792
2001
def cleanup():
793
2002
"Cleanup function; run on exit"
794
global group
795
# From the Avahi example code
796
if not group is None:
797
group.Free()
798
group = None
799
# End of Avahi example code
2003
service.cleanup()
800
2004
801
while clients:
802
client = clients.pop()
803
client.stop_hook = None
804
client.stop()
2005
while tcp_server.clients:
2006
client = tcp_server.clients.pop()
2007
if use_dbus:
2008
client.remove_from_connection()
2009
client.disable_hook = None
2010
# Don't signal anything except ClientRemoved
2011
client.disable(quiet=True)
2012
if use_dbus:
2013
# Emit D-Bus signal
2014
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2015
client.name)
805
2016
806
2017
atexit.register(cleanup)
807
2018
808
if not debug:
809
signal.signal(signal.SIGINT, signal.SIG_IGN)
810
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
811
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
812
813
for client in clients:
814
client.start()
815
816
tcp_server = IPv6_TCPServer((server_settings["address"],
817
server_settings["port"]),
818
tcp_handler,
819
settings=server_settings,
820
clients=clients)
2019
for client in tcp_server.clients:
2020
if use_dbus:
2021
# Emit D-Bus signal
2022
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2023
client.enable()
2024
2025
tcp_server.enable()
2026
tcp_server.server_activate()
2027
821
2028
# Find out what port we got
822
2029
service.port = tcp_server.socket.getsockname()[1]
823
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
824
u" scope_id %d" % tcp_server.socket.getsockname())
2030
if use_ipv6:
2031
logger.info("Now listening on address %r, port %d,"
2032
" flowinfo %d, scope_id %d"
2033
% tcp_server.socket.getsockname())
2034
else: # IPv4
2035
logger.info("Now listening on address %r, port %d"
2036
% tcp_server.socket.getsockname())
825
2037
826
2038
#service.interface = tcp_server.socket.getsockname()[3]
827
2039
828
2040
try:
829
2041
# From the Avahi example code
830
server.connect_to_signal("StateChanged", server_state_changed)
831
2042
try:
832
server_state_changed(server.GetState())
833
except dbus.exceptions.DBusException, error:
834
logger.critical(u"DBusException: %s", error)
2043
service.activate()
2044
except dbus.exceptions.DBusException as error:
2045
logger.critical("DBusException: %s", error)
2046
cleanup()
835
2047
sys.exit(1)
836
2048
# End of Avahi example code
837
2049
838
2050
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
839
2051
lambda *args, **kwargs:
840
tcp_server.handle_request\
841
(*args[2:], **kwargs) or True)
2052
(tcp_server.handle_request
2053
(*args[2:], **kwargs) or True))
842
2054
843
logger.debug(u"Starting main loop")
844
main_loop_started = True
2055
logger.debug("Starting main loop")
845
2056
main_loop.run()
846
except AvahiError, error:
847
logger.critical(u"AvahiError: %s" + unicode(error))
2057
except AvahiError as error:
2058
logger.critical("AvahiError: %s", error)
2059
cleanup()
848
2060
sys.exit(1)
849
2061
except KeyboardInterrupt:
850
2062
if debug:
851
print
2063
print("", file=sys.stderr)
2064
logger.debug("Server received KeyboardInterrupt")
2065
logger.debug("Server exiting")
2066
# Must run before the D-Bus bus name gets deregistered
2067
cleanup()
852
2068
853
2069
if __name__ == '__main__':
854
2070
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0