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- Committer: Teddy Hogeborn
- Date: 2008-08-09 01:39:09 UTC
- Revision ID: teddy@fukt.bsnet.se-20080809013909-n3i3ll1voycmmw7l
* clients.conf: Better comments.
(foo): Commented out and changed into a better example client.
(braxen_client): Removed.
(bar): New commented-out example client.
* mandos: Changed all log messages to be unicode strings.
(Client.fqdn): Renamed to "host". All users and documentation
changed.
(main): Exit immediately if no clients are defined.
* mandos.conf: Better comments.
(foo): Commented out and changed into a better example client.
(braxen_client): Removed.
(bar): New commented-out example client.
* mandos: Changed all log messages to be unicode strings.
(Client.fqdn): Renamed to "host". All users and documentation
changed.
(main): Exit immediately if no clients are defined.
* mandos.conf: Better comments.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.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", "remove", "server_state_changed",
10
# "entry_group_state_changed", "cleanup", and "activate" in the
11
# "AvahiService" class, and some lines in "main".
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".
12
12
#
13
13
# Everything else is
14
# Copyright © 2008-2011 Teddy Hogeborn
15
# Copyright © 2008-2011 Björn Påhlsson
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
#
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
25
24
# GNU General Public License for more details.
26
25
#
27
26
# You should have received a copy of the GNU General Public License
28
# along with this program. If not, see
29
# <http://www.gnu.org/licenses/>.
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
30
28
#
31
29
# Contact the authors at <mandos@fukt.bsnet.se>.
32
30
#
33
31
34
from __future__ import (division, absolute_import, print_function,
35
unicode_literals)
32
from __future__ import division
36
33
37
import SocketServer as socketserver
34
import SocketServer
38
35
import socket
39
import argparse
36
import select
37
from optparse import OptionParser
40
38
import datetime
41
39
import errno
42
40
import gnutls.crypto
45
43
import gnutls.library.functions
46
44
import gnutls.library.constants
47
45
import gnutls.library.types
48
import ConfigParser as configparser
46
import ConfigParser
49
47
import sys
50
48
import re
51
49
import os
52
50
import signal
51
from sets import Set
53
52
import subprocess
54
53
import atexit
55
54
import stat
56
55
import logging
57
56
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
65
57
66
58
import dbus
67
import dbus.service
68
59
import gobject
69
60
import avahi
70
61
from dbus.mainloop.glib import DBusGMainLoop
71
62
import ctypes
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 = "1.3.1"
86
87
#logger = logging.getLogger('mandos')
63
64
88
65
logger = logging.Logger('mandos')
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'))
66
syslogger = logging.handlers.SysLogHandler\
67
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
68
syslogger.setFormatter(logging.Formatter\
69
('%(levelname)s: %(message)s'))
95
70
logger.addHandler(syslogger)
71
del syslogger
96
72
97
console = logging.StreamHandler()
98
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
' %(levelname)s:'
100
' %(message)s'))
101
logger.addHandler(console)
102
73
103
74
class AvahiError(Exception):
104
def __init__(self, value, *args, **kwargs):
75
def __init__(self, value):
105
76
self.value = value
106
super(AvahiError, self).__init__(value, *args, **kwargs)
107
def __unicode__(self):
108
return unicode(repr(self.value))
77
def __str__(self):
78
return repr(self.value)
109
79
110
80
class AvahiServiceError(AvahiError):
111
81
pass
116
86
117
87
class AvahiService(object):
118
88
"""An Avahi (Zeroconf) service.
119
120
89
Attributes:
121
90
interface: integer; avahi.IF_UNSPEC or an interface index.
122
91
Used to optionally bind to the specified interface.
130
99
max_renames: integer; maximum number of renames
131
100
rename_count: integer; counter so we only rename after collisions
132
101
a sensible number of times
133
group: D-Bus Entry Group
134
server: D-Bus Server
135
bus: dbus.SystemBus()
136
102
"""
137
103
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
138
servicetype = None, port = None, TXT = None,
139
domain = "", host = "", max_renames = 32768,
140
protocol = avahi.PROTO_UNSPEC, bus = None):
104
type = None, port = None, TXT = None, domain = "",
105
host = "", max_renames = 12):
141
106
self.interface = interface
142
107
self.name = name
143
self.type = servicetype
108
self.type = type
144
109
self.port = port
145
self.TXT = TXT if TXT is not None else []
110
if TXT is None:
111
self.TXT = []
112
else:
113
self.TXT = TXT
146
114
self.domain = domain
147
115
self.host = host
148
116
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
155
117
def rename(self):
156
118
"""Derived from the Avahi example code"""
157
119
if self.rename_count >= self.max_renames:
158
logger.critical("No suitable Zeroconf service name found"
159
" after %i retries, exiting.",
160
self.rename_count)
120
logger.critical(u"No suitable service name found after %i"
121
u" retries, exiting.", rename_count)
161
122
raise AvahiServiceError("Too many renames")
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))
123
name = server.GetAlternativeServiceName(name)
124
logger.error(u"Changing name to %r ...", name)
169
125
self.remove()
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)
126
self.add()
176
127
self.rename_count += 1
177
128
def remove(self):
178
129
"""Derived from the Avahi example code"""
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()
130
if group is not None:
131
group.Reset()
184
132
def add(self):
185
133
"""Derived from the 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())
134
global group
135
if group is None:
136
group = dbus.Interface\
137
(bus.get_object(avahi.DBUS_NAME,
138
server.EntryGroupNew()),
139
avahi.DBUS_INTERFACE_ENTRY_GROUP)
140
group.connect_to_signal('StateChanged',
141
entry_group_state_changed)
142
logger.debug(u"Adding service '%s' of type '%s' ...",
143
service.name, service.type)
144
group.AddService(
145
self.interface, # interface
146
avahi.PROTO_INET6, # protocol
147
dbus.UInt32(0), # flags
148
self.name, self.type,
149
self.domain, self.host,
150
dbus.UInt16(self.port),
151
avahi.string_array_to_txt_array(self.TXT))
152
group.Commit()
153
154
# From the Avahi example code:
155
group = None # our entry group
156
# End of Avahi example code
265
157
266
158
267
159
class Client(object):
268
160
"""A representation of a client host served by this server.
269
270
161
Attributes:
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
162
name: string; from the config file, used in log messages
163
fingerprint: string (40 or 32 hexadecimal digits); used to
164
uniquely identify the client
165
secret: bytestring; sent verbatim (over TLS) to client
166
host: string; available for use by the checker command
167
created: datetime.datetime(); object creation, not client host
168
last_checked_ok: datetime.datetime() or None if not yet checked OK
169
timeout: datetime.timedelta(); How long from last_checked_ok
170
until this client is invalid
171
interval: datetime.timedelta(); How often to start a new checker
172
stop_hook: If set, called by stop() as stop_hook(self)
173
checker: subprocess.Popen(); a running checker process used
174
to see if the client lives.
175
'None' if no process is running.
176
checker_initiator_tag: a gobject event source tag, or None
177
stop_initiator_tag: - '' -
178
checker_callback_tag: - '' -
179
checker_command: string; External command which is run to check if
180
client lives. %() expansions are done at
280
181
runtime with vars(self) as dict, so that for
281
182
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()
288
fingerprint: string (40 or 32 hexadecimal digits); used to
289
uniquely identify the client
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
extended_timeout: extra long timeout when password has been sent
301
runtime_expansions: Allowed attributes for runtime expansion.
302
expire: datetime.datetime(); time (UTC) when a client will be
303
disabled, or None
183
Private attibutes:
184
_timeout: Real variable for 'timeout'
185
_interval: Real variable for 'interval'
186
_timeout_milliseconds: Used when calling gobject.timeout_add()
187
_interval_milliseconds: - '' -
304
188
"""
305
306
runtime_expansions = ("approval_delay", "approval_duration",
307
"created", "enabled", "fingerprint",
308
"host", "interval", "last_checked_ok",
309
"last_enabled", "name", "timeout")
310
311
@staticmethod
312
def _timedelta_to_milliseconds(td):
313
"Convert a datetime.timedelta() to milliseconds"
314
return ((td.days * 24 * 60 * 60 * 1000)
315
+ (td.seconds * 1000)
316
+ (td.microseconds // 1000))
317
318
def timeout_milliseconds(self):
319
"Return the 'timeout' attribute in milliseconds"
320
return self._timedelta_to_milliseconds(self.timeout)
321
322
def extended_timeout_milliseconds(self):
323
"Return the 'extended_timeout' attribute in milliseconds"
324
return self._timedelta_to_milliseconds(self.extended_timeout)
325
326
def interval_milliseconds(self):
327
"Return the 'interval' attribute in milliseconds"
328
return self._timedelta_to_milliseconds(self.interval)
329
330
def approval_delay_milliseconds(self):
331
return self._timedelta_to_milliseconds(self.approval_delay)
332
333
def __init__(self, name = None, disable_hook=None, config=None):
189
def _set_timeout(self, timeout):
190
"Setter function for 'timeout' attribute"
191
self._timeout = timeout
192
self._timeout_milliseconds = ((self.timeout.days
193
* 24 * 60 * 60 * 1000)
194
+ (self.timeout.seconds * 1000)
195
+ (self.timeout.microseconds
196
// 1000))
197
timeout = property(lambda self: self._timeout,
198
_set_timeout)
199
del _set_timeout
200
def _set_interval(self, interval):
201
"Setter function for 'interval' attribute"
202
self._interval = interval
203
self._interval_milliseconds = ((self.interval.days
204
* 24 * 60 * 60 * 1000)
205
+ (self.interval.seconds
206
* 1000)
207
+ (self.interval.microseconds
208
// 1000))
209
interval = property(lambda self: self._interval,
210
_set_interval)
211
del _set_interval
212
def __init__(self, name = None, stop_hook=None, config={}):
334
213
"""Note: the 'checker' key in 'config' sets the
335
214
'checker_command' attribute and *not* the 'checker'
336
215
attribute."""
337
216
self.name = name
338
if config is None:
339
config = {}
340
logger.debug("Creating client %r", self.name)
217
logger.debug(u"Creating client %r", self.name)
341
218
# Uppercase and remove spaces from fingerprint for later
342
219
# comparison purposes with return value from the fingerprint()
343
220
# function
344
self.fingerprint = (config["fingerprint"].upper()
345
.replace(" ", ""))
346
logger.debug(" Fingerprint: %s", self.fingerprint)
221
self.fingerprint = config["fingerprint"].upper()\
222
.replace(u" ", u"")
223
logger.debug(u" Fingerprint: %s", self.fingerprint)
347
224
if "secret" in config:
348
self.secret = config["secret"].decode("base64")
225
self.secret = config["secret"].decode(u"base64")
349
226
elif "secfile" in config:
350
with open(os.path.expanduser(os.path.expandvars
351
(config["secfile"])),
352
"rb") as secfile:
353
self.secret = secfile.read()
227
sf = open(config["secfile"])
228
self.secret = sf.read()
229
sf.close()
354
230
else:
355
raise TypeError("No secret or secfile for client %s"
231
raise TypeError(u"No secret or secfile for client %s"
356
232
% self.name)
357
233
self.host = config.get("host", "")
358
self.created = datetime.datetime.utcnow()
359
self.enabled = False
360
self.last_approval_request = None
361
self.last_enabled = None
234
self.created = datetime.datetime.now()
362
235
self.last_checked_ok = None
363
236
self.timeout = string_to_delta(config["timeout"])
364
self.extended_timeout = string_to_delta(config["extended_timeout"])
365
237
self.interval = string_to_delta(config["interval"])
366
self.disable_hook = disable_hook
238
self.stop_hook = stop_hook
367
239
self.checker = None
368
240
self.checker_initiator_tag = None
369
self.disable_initiator_tag = None
370
self.expires = None
241
self.stop_initiator_tag = None
371
242
self.checker_callback_tag = None
372
self.checker_command = config["checker"]
373
self.current_checker_command = None
374
self.last_connect = None
375
self._approved = None
376
self.approved_by_default = config.get("approved_by_default",
377
True)
378
self.approvals_pending = 0
379
self.approval_delay = string_to_delta(
380
config["approval_delay"])
381
self.approval_duration = string_to_delta(
382
config["approval_duration"])
383
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
384
385
def send_changedstate(self):
386
self.changedstate.acquire()
387
self.changedstate.notify_all()
388
self.changedstate.release()
389
390
def enable(self):
243
self.check_command = config["checker"]
244
def start(self):
391
245
"""Start this client's checker and timeout hooks"""
392
if getattr(self, "enabled", False):
393
# Already enabled
394
return
395
self.send_changedstate()
396
self.last_enabled = datetime.datetime.utcnow()
397
246
# Schedule a new checker to be started an 'interval' from now,
398
247
# and every interval from then on.
399
self.checker_initiator_tag = (gobject.timeout_add
400
(self.interval_milliseconds(),
401
self.start_checker))
402
# Schedule a disable() when 'timeout' has passed
403
self.expires = datetime.datetime.utcnow() + self.timeout
404
self.disable_initiator_tag = (gobject.timeout_add
405
(self.timeout_milliseconds(),
406
self.disable))
407
self.enabled = True
248
self.checker_initiator_tag = gobject.timeout_add\
249
(self._interval_milliseconds,
250
self.start_checker)
408
251
# Also start a new checker *right now*.
409
252
self.start_checker()
410
411
def disable(self, quiet=True):
412
"""Disable this client."""
413
if not getattr(self, "enabled", False):
253
# Schedule a stop() when 'timeout' has passed
254
self.stop_initiator_tag = gobject.timeout_add\
255
(self._timeout_milliseconds,
256
self.stop)
257
def stop(self):
258
"""Stop this client.
259
The possibility that a client might be restarted is left open,
260
but not currently used."""
261
# If this client doesn't have a secret, it is already stopped.
262
if hasattr(self, "secret") and self.secret:
263
logger.info(u"Stopping client %s", self.name)
264
self.secret = None
265
else:
414
266
return False
415
if not quiet:
416
self.send_changedstate()
417
if not quiet:
418
logger.info("Disabling client %s", self.name)
419
if getattr(self, "disable_initiator_tag", False):
420
gobject.source_remove(self.disable_initiator_tag)
421
self.disable_initiator_tag = None
422
self.expires = None
267
if getattr(self, "stop_initiator_tag", False):
268
gobject.source_remove(self.stop_initiator_tag)
269
self.stop_initiator_tag = None
423
270
if getattr(self, "checker_initiator_tag", False):
424
271
gobject.source_remove(self.checker_initiator_tag)
425
272
self.checker_initiator_tag = None
426
273
self.stop_checker()
427
if self.disable_hook:
428
self.disable_hook(self)
429
self.enabled = False
274
if self.stop_hook:
275
self.stop_hook(self)
430
276
# Do not run this again if called by a gobject.timeout_add
431
277
return False
432
433
278
def __del__(self):
434
self.disable_hook = None
435
self.disable()
436
437
def checker_callback(self, pid, condition, command):
279
self.stop_hook = None
280
self.stop()
281
def checker_callback(self, pid, condition):
438
282
"""The checker has completed, so take appropriate actions."""
283
now = datetime.datetime.now()
439
284
self.checker_callback_tag = None
440
285
self.checker = None
441
if os.WIFEXITED(condition):
442
exitstatus = os.WEXITSTATUS(condition)
443
if exitstatus == 0:
444
logger.info("Checker for %(name)s succeeded",
445
vars(self))
446
self.checked_ok()
447
else:
448
logger.info("Checker for %(name)s failed",
449
vars(self))
450
else:
451
logger.warning("Checker for %(name)s crashed?",
286
if os.WIFEXITED(condition) \
287
and (os.WEXITSTATUS(condition) == 0):
288
logger.info(u"Checker for %(name)s succeeded",
289
vars(self))
290
self.last_checked_ok = now
291
gobject.source_remove(self.stop_initiator_tag)
292
self.stop_initiator_tag = gobject.timeout_add\
293
(self._timeout_milliseconds,
294
self.stop)
295
elif not os.WIFEXITED(condition):
296
logger.warning(u"Checker for %(name)s crashed?",
452
297
vars(self))
453
454
def checked_ok(self, timeout=None):
455
"""Bump up the timeout for this client.
456
457
This should only be called when the client has been seen,
458
alive and well.
459
"""
460
if timeout is None:
461
timeout = self.timeout
462
self.last_checked_ok = datetime.datetime.utcnow()
463
gobject.source_remove(self.disable_initiator_tag)
464
self.expires = datetime.datetime.utcnow() + timeout
465
self.disable_initiator_tag = (gobject.timeout_add
466
(self._timedelta_to_milliseconds(timeout),
467
self.disable))
468
469
def need_approval(self):
470
self.last_approval_request = datetime.datetime.utcnow()
471
298
else:
299
logger.info(u"Checker for %(name)s failed",
300
vars(self))
472
301
def start_checker(self):
473
302
"""Start a new checker subprocess if one is not running.
474
475
303
If a checker already exists, leave it running and do
476
304
nothing."""
477
305
# The reason for not killing a running checker is that if we
480
308
# client would inevitably timeout, since no checker would get
481
309
# a chance to run to completion. If we instead leave running
482
310
# checkers alone, the checker would have to take more time
483
# than 'timeout' for the client to be disabled, which is as it
484
# should be.
485
486
# If a checker exists, make sure it is not a zombie
487
try:
488
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
489
except (AttributeError, OSError) as error:
490
if (isinstance(error, OSError)
491
and error.errno != errno.ECHILD):
492
raise error
493
else:
494
if pid:
495
logger.warning("Checker was a zombie")
496
gobject.source_remove(self.checker_callback_tag)
497
self.checker_callback(pid, status,
498
self.current_checker_command)
499
# Start a new checker if needed
311
# than 'timeout' for the client to be declared invalid, which
312
# is as it should be.
500
313
if self.checker is None:
501
314
try:
502
# In case checker_command has exactly one % operator
503
command = self.checker_command % self.host
315
# In case check_command has exactly one % operator
316
command = self.check_command % self.host
504
317
except TypeError:
505
318
# Escape attributes for the shell
506
escaped_attrs = dict(
507
(attr,
508
re.escape(unicode(str(getattr(self, attr, "")),
509
errors=
510
'replace')))
511
for attr in
512
self.runtime_expansions)
513
319
escaped_attrs = dict((key, re.escape(str(val)))
320
for key, val in
321
vars(self).iteritems())
514
322
try:
515
command = self.checker_command % escaped_attrs
516
except TypeError as error:
517
logger.error('Could not format string "%s":'
518
' %s', self.checker_command, error)
323
command = self.check_command % escaped_attrs
324
except TypeError, error:
325
logger.error(u'Could not format string "%s":'
326
u' %s', self.check_command, error)
519
327
return True # Try again later
520
self.current_checker_command = command
521
328
try:
522
logger.info("Starting checker %r for %s",
329
logger.info(u"Starting checker %r for %s",
523
330
command, self.name)
524
# We don't need to redirect stdout and stderr, since
525
# in normal mode, that is already done by daemon(),
526
# and in debug mode we don't want to. (Stdin is
527
# always replaced by /dev/null.)
528
331
self.checker = subprocess.Popen(command,
529
332
close_fds=True,
530
333
shell=True, cwd="/")
531
self.checker_callback_tag = (gobject.child_watch_add
532
(self.checker.pid,
533
self.checker_callback,
534
data=command))
535
# The checker may have completed before the gobject
536
# watch was added. Check for this.
537
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
538
if pid:
539
gobject.source_remove(self.checker_callback_tag)
540
self.checker_callback(pid, status, command)
541
except OSError as error:
542
logger.error("Failed to start subprocess: %s",
334
self.checker_callback_tag = gobject.child_watch_add\
335
(self.checker.pid,
336
self.checker_callback)
337
except subprocess.OSError, error:
338
logger.error(u"Failed to start subprocess: %s",
543
339
error)
544
340
# Re-run this periodically if run by gobject.timeout_add
545
341
return True
546
547
342
def stop_checker(self):
548
343
"""Force the checker process, if any, to stop."""
549
344
if self.checker_callback_tag:
551
346
self.checker_callback_tag = None
552
347
if getattr(self, "checker", None) is None:
553
348
return
554
logger.debug("Stopping checker for %(name)s", vars(self))
349
logger.debug(u"Stopping checker for %(name)s", vars(self))
555
350
try:
556
351
os.kill(self.checker.pid, signal.SIGTERM)
557
#time.sleep(0.5)
352
#os.sleep(0.5)
558
353
#if self.checker.poll() is None:
559
354
# os.kill(self.checker.pid, signal.SIGKILL)
560
except OSError as error:
355
except OSError, error:
561
356
if error.errno != errno.ESRCH: # No such process
562
357
raise
563
358
self.checker = None
564
565
def dbus_service_property(dbus_interface, signature="v",
566
access="readwrite", byte_arrays=False):
567
"""Decorators for marking methods of a DBusObjectWithProperties to
568
become properties on the D-Bus.
569
570
The decorated method will be called with no arguments by "Get"
571
and with one argument by "Set".
572
573
The parameters, where they are supported, are the same as
574
dbus.service.method, except there is only "signature", since the
575
type from Get() and the type sent to Set() is the same.
576
"""
577
# Encoding deeply encoded byte arrays is not supported yet by the
578
# "Set" method, so we fail early here:
579
if byte_arrays and signature != "ay":
580
raise ValueError("Byte arrays not supported for non-'ay'"
581
" signature %r" % signature)
582
def decorator(func):
583
func._dbus_is_property = True
584
func._dbus_interface = dbus_interface
585
func._dbus_signature = signature
586
func._dbus_access = access
587
func._dbus_name = func.__name__
588
if func._dbus_name.endswith("_dbus_property"):
589
func._dbus_name = func._dbus_name[:-14]
590
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
591
return func
592
return decorator
593
594
595
class DBusPropertyException(dbus.exceptions.DBusException):
596
"""A base class for D-Bus property-related exceptions
597
"""
598
def __unicode__(self):
599
return unicode(str(self))
600
601
602
class DBusPropertyAccessException(DBusPropertyException):
603
"""A property's access permissions disallows an operation.
604
"""
605
pass
606
607
608
class DBusPropertyNotFound(DBusPropertyException):
609
"""An attempt was made to access a non-existing property.
610
"""
611
pass
612
613
614
class DBusObjectWithProperties(dbus.service.Object):
615
"""A D-Bus object with properties.
616
617
Classes inheriting from this can use the dbus_service_property
618
decorator to expose methods as D-Bus properties. It exposes the
619
standard Get(), Set(), and GetAll() methods on the D-Bus.
620
"""
621
622
@staticmethod
623
def _is_dbus_property(obj):
624
return getattr(obj, "_dbus_is_property", False)
625
626
def _get_all_dbus_properties(self):
627
"""Returns a generator of (name, attribute) pairs
628
"""
629
return ((prop._dbus_name, prop)
630
for name, prop in
631
inspect.getmembers(self, self._is_dbus_property))
632
633
def _get_dbus_property(self, interface_name, property_name):
634
"""Returns a bound method if one exists which is a D-Bus
635
property with the specified name and interface.
636
"""
637
for name in (property_name,
638
property_name + "_dbus_property"):
639
prop = getattr(self, name, None)
640
if (prop is None
641
or not self._is_dbus_property(prop)
642
or prop._dbus_name != property_name
643
or (interface_name and prop._dbus_interface
644
and interface_name != prop._dbus_interface)):
645
continue
646
return prop
647
# No such property
648
raise DBusPropertyNotFound(self.dbus_object_path + ":"
649
+ interface_name + "."
650
+ property_name)
651
652
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
653
out_signature="v")
654
def Get(self, interface_name, property_name):
655
"""Standard D-Bus property Get() method, see D-Bus standard.
656
"""
657
prop = self._get_dbus_property(interface_name, property_name)
658
if prop._dbus_access == "write":
659
raise DBusPropertyAccessException(property_name)
660
value = prop()
661
if not hasattr(value, "variant_level"):
662
return value
663
return type(value)(value, variant_level=value.variant_level+1)
664
665
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
666
def Set(self, interface_name, property_name, value):
667
"""Standard D-Bus property Set() method, see D-Bus standard.
668
"""
669
prop = self._get_dbus_property(interface_name, property_name)
670
if prop._dbus_access == "read":
671
raise DBusPropertyAccessException(property_name)
672
if prop._dbus_get_args_options["byte_arrays"]:
673
# The byte_arrays option is not supported yet on
674
# signatures other than "ay".
675
if prop._dbus_signature != "ay":
676
raise ValueError
677
value = dbus.ByteArray(''.join(unichr(byte)
678
for byte in value))
679
prop(value)
680
681
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
682
out_signature="a{sv}")
683
def GetAll(self, interface_name):
684
"""Standard D-Bus property GetAll() method, see D-Bus
685
standard.
686
687
Note: Will not include properties with access="write".
688
"""
689
all = {}
690
for name, prop in self._get_all_dbus_properties():
691
if (interface_name
692
and interface_name != prop._dbus_interface):
693
# Interface non-empty but did not match
694
continue
695
# Ignore write-only properties
696
if prop._dbus_access == "write":
697
continue
698
value = prop()
699
if not hasattr(value, "variant_level"):
700
all[name] = value
701
continue
702
all[name] = type(value)(value, variant_level=
703
value.variant_level+1)
704
return dbus.Dictionary(all, signature="sv")
705
706
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
707
out_signature="s",
708
path_keyword='object_path',
709
connection_keyword='connection')
710
def Introspect(self, object_path, connection):
711
"""Standard D-Bus method, overloaded to insert property tags.
712
"""
713
xmlstring = dbus.service.Object.Introspect(self, object_path,
714
connection)
715
try:
716
document = xml.dom.minidom.parseString(xmlstring)
717
def make_tag(document, name, prop):
718
e = document.createElement("property")
719
e.setAttribute("name", name)
720
e.setAttribute("type", prop._dbus_signature)
721
e.setAttribute("access", prop._dbus_access)
722
return e
723
for if_tag in document.getElementsByTagName("interface"):
724
for tag in (make_tag(document, name, prop)
725
for name, prop
726
in self._get_all_dbus_properties()
727
if prop._dbus_interface
728
== if_tag.getAttribute("name")):
729
if_tag.appendChild(tag)
730
# Add the names to the return values for the
731
# "org.freedesktop.DBus.Properties" methods
732
if (if_tag.getAttribute("name")
733
== "org.freedesktop.DBus.Properties"):
734
for cn in if_tag.getElementsByTagName("method"):
735
if cn.getAttribute("name") == "Get":
736
for arg in cn.getElementsByTagName("arg"):
737
if (arg.getAttribute("direction")
738
== "out"):
739
arg.setAttribute("name", "value")
740
elif cn.getAttribute("name") == "GetAll":
741
for arg in cn.getElementsByTagName("arg"):
742
if (arg.getAttribute("direction")
743
== "out"):
744
arg.setAttribute("name", "props")
745
xmlstring = document.toxml("utf-8")
746
document.unlink()
747
except (AttributeError, xml.dom.DOMException,
748
xml.parsers.expat.ExpatError) as error:
749
logger.error("Failed to override Introspection method",
750
error)
751
return xmlstring
752
753
754
class ClientDBus(Client, DBusObjectWithProperties):
755
"""A Client class using D-Bus
756
757
Attributes:
758
dbus_object_path: dbus.ObjectPath
759
bus: dbus.SystemBus()
760
"""
761
762
runtime_expansions = (Client.runtime_expansions
763
+ ("dbus_object_path",))
764
765
# dbus.service.Object doesn't use super(), so we can't either.
766
767
def __init__(self, bus = None, *args, **kwargs):
768
self._approvals_pending = 0
769
self.bus = bus
770
Client.__init__(self, *args, **kwargs)
771
# Only now, when this client is initialized, can it show up on
772
# the D-Bus
773
client_object_name = unicode(self.name).translate(
774
{ord("."): ord("_"),
775
ord("-"): ord("_")})
776
self.dbus_object_path = (dbus.ObjectPath
777
("/clients/" + client_object_name))
778
DBusObjectWithProperties.__init__(self, self.bus,
779
self.dbus_object_path)
780
def _set_expires(self, value):
781
old_value = getattr(self, "_expires", None)
782
self._expires = value
783
if hasattr(self, "dbus_object_path") and old_value != value:
784
dbus_time = (self._datetime_to_dbus(self._expires,
785
variant_level=1))
786
self.PropertyChanged(dbus.String("Expires"),
787
dbus_time)
788
expires = property(lambda self: self._expires, _set_expires)
789
del _set_expires
790
791
def _get_approvals_pending(self):
792
return self._approvals_pending
793
def _set_approvals_pending(self, value):
794
old_value = self._approvals_pending
795
self._approvals_pending = value
796
bval = bool(value)
797
if (hasattr(self, "dbus_object_path")
798
and bval is not bool(old_value)):
799
dbus_bool = dbus.Boolean(bval, variant_level=1)
800
self.PropertyChanged(dbus.String("ApprovalPending"),
801
dbus_bool)
802
803
approvals_pending = property(_get_approvals_pending,
804
_set_approvals_pending)
805
del _get_approvals_pending, _set_approvals_pending
806
807
@staticmethod
808
def _datetime_to_dbus(dt, variant_level=0):
809
"""Convert a UTC datetime.datetime() to a D-Bus type."""
810
if dt is None:
811
return dbus.String("", variant_level = variant_level)
812
return dbus.String(dt.isoformat(),
813
variant_level=variant_level)
814
815
def enable(self):
816
oldstate = getattr(self, "enabled", False)
817
r = Client.enable(self)
818
if oldstate != self.enabled:
819
# Emit D-Bus signals
820
self.PropertyChanged(dbus.String("Enabled"),
821
dbus.Boolean(True, variant_level=1))
822
self.PropertyChanged(
823
dbus.String("LastEnabled"),
824
self._datetime_to_dbus(self.last_enabled,
825
variant_level=1))
826
return r
827
828
def disable(self, quiet = False):
829
oldstate = getattr(self, "enabled", False)
830
r = Client.disable(self, quiet=quiet)
831
if not quiet and oldstate != self.enabled:
832
# Emit D-Bus signal
833
self.PropertyChanged(dbus.String("Enabled"),
834
dbus.Boolean(False, variant_level=1))
835
return r
836
837
def __del__(self, *args, **kwargs):
838
try:
839
self.remove_from_connection()
840
except LookupError:
841
pass
842
if hasattr(DBusObjectWithProperties, "__del__"):
843
DBusObjectWithProperties.__del__(self, *args, **kwargs)
844
Client.__del__(self, *args, **kwargs)
845
846
def checker_callback(self, pid, condition, command,
847
*args, **kwargs):
848
self.checker_callback_tag = None
849
self.checker = None
850
# Emit D-Bus signal
851
self.PropertyChanged(dbus.String("CheckerRunning"),
852
dbus.Boolean(False, variant_level=1))
853
if os.WIFEXITED(condition):
854
exitstatus = os.WEXITSTATUS(condition)
855
# Emit D-Bus signal
856
self.CheckerCompleted(dbus.Int16(exitstatus),
857
dbus.Int64(condition),
858
dbus.String(command))
859
else:
860
# Emit D-Bus signal
861
self.CheckerCompleted(dbus.Int16(-1),
862
dbus.Int64(condition),
863
dbus.String(command))
864
865
return Client.checker_callback(self, pid, condition, command,
866
*args, **kwargs)
867
868
def checked_ok(self, *args, **kwargs):
869
Client.checked_ok(self, *args, **kwargs)
870
# Emit D-Bus signal
871
self.PropertyChanged(
872
dbus.String("LastCheckedOK"),
873
(self._datetime_to_dbus(self.last_checked_ok,
874
variant_level=1)))
875
876
def need_approval(self, *args, **kwargs):
877
r = Client.need_approval(self, *args, **kwargs)
878
# Emit D-Bus signal
879
self.PropertyChanged(
880
dbus.String("LastApprovalRequest"),
881
(self._datetime_to_dbus(self.last_approval_request,
882
variant_level=1)))
883
return r
884
885
def start_checker(self, *args, **kwargs):
886
old_checker = self.checker
887
if self.checker is not None:
888
old_checker_pid = self.checker.pid
889
else:
890
old_checker_pid = None
891
r = Client.start_checker(self, *args, **kwargs)
892
# Only if new checker process was started
893
if (self.checker is not None
894
and old_checker_pid != self.checker.pid):
895
# Emit D-Bus signal
896
self.CheckerStarted(self.current_checker_command)
897
self.PropertyChanged(
898
dbus.String("CheckerRunning"),
899
dbus.Boolean(True, variant_level=1))
900
return r
901
902
def stop_checker(self, *args, **kwargs):
903
old_checker = getattr(self, "checker", None)
904
r = Client.stop_checker(self, *args, **kwargs)
905
if (old_checker is not None
906
and getattr(self, "checker", None) is None):
907
self.PropertyChanged(dbus.String("CheckerRunning"),
908
dbus.Boolean(False, variant_level=1))
909
return r
910
911
def _reset_approved(self):
912
self._approved = None
913
return False
914
915
def approve(self, value=True):
916
self.send_changedstate()
917
self._approved = value
918
gobject.timeout_add(self._timedelta_to_milliseconds
919
(self.approval_duration),
920
self._reset_approved)
921
922
923
## D-Bus methods, signals & properties
924
_interface = "se.bsnet.fukt.Mandos.Client"
925
926
## Signals
927
928
# CheckerCompleted - signal
929
@dbus.service.signal(_interface, signature="nxs")
930
def CheckerCompleted(self, exitcode, waitstatus, command):
931
"D-Bus signal"
932
pass
933
934
# CheckerStarted - signal
935
@dbus.service.signal(_interface, signature="s")
936
def CheckerStarted(self, command):
937
"D-Bus signal"
938
pass
939
940
# PropertyChanged - signal
941
@dbus.service.signal(_interface, signature="sv")
942
def PropertyChanged(self, property, value):
943
"D-Bus signal"
944
pass
945
946
# GotSecret - signal
947
@dbus.service.signal(_interface)
948
def GotSecret(self):
949
"""D-Bus signal
950
Is sent after a successful transfer of secret from the Mandos
951
server to mandos-client
952
"""
953
pass
954
955
# Rejected - signal
956
@dbus.service.signal(_interface, signature="s")
957
def Rejected(self, reason):
958
"D-Bus signal"
959
pass
960
961
# NeedApproval - signal
962
@dbus.service.signal(_interface, signature="tb")
963
def NeedApproval(self, timeout, default):
964
"D-Bus signal"
965
return self.need_approval()
966
967
## Methods
968
969
# Approve - method
970
@dbus.service.method(_interface, in_signature="b")
971
def Approve(self, value):
972
self.approve(value)
973
974
# CheckedOK - method
975
@dbus.service.method(_interface)
976
def CheckedOK(self):
977
self.checked_ok()
978
979
# Enable - method
980
@dbus.service.method(_interface)
981
def Enable(self):
982
"D-Bus method"
983
self.enable()
984
985
# StartChecker - method
986
@dbus.service.method(_interface)
987
def StartChecker(self):
988
"D-Bus method"
989
self.start_checker()
990
991
# Disable - method
992
@dbus.service.method(_interface)
993
def Disable(self):
994
"D-Bus method"
995
self.disable()
996
997
# StopChecker - method
998
@dbus.service.method(_interface)
999
def StopChecker(self):
1000
self.stop_checker()
1001
1002
## Properties
1003
1004
# ApprovalPending - property
1005
@dbus_service_property(_interface, signature="b", access="read")
1006
def ApprovalPending_dbus_property(self):
1007
return dbus.Boolean(bool(self.approvals_pending))
1008
1009
# ApprovedByDefault - property
1010
@dbus_service_property(_interface, signature="b",
1011
access="readwrite")
1012
def ApprovedByDefault_dbus_property(self, value=None):
1013
if value is None: # get
1014
return dbus.Boolean(self.approved_by_default)
1015
old_value = self.approved_by_default
1016
self.approved_by_default = bool(value)
1017
# Emit D-Bus signal
1018
if old_value != self.approved_by_default:
1019
self.PropertyChanged(dbus.String("ApprovedByDefault"),
1020
dbus.Boolean(value, variant_level=1))
1021
1022
# ApprovalDelay - property
1023
@dbus_service_property(_interface, signature="t",
1024
access="readwrite")
1025
def ApprovalDelay_dbus_property(self, value=None):
1026
if value is None: # get
1027
return dbus.UInt64(self.approval_delay_milliseconds())
1028
old_value = self.approval_delay
1029
self.approval_delay = datetime.timedelta(0, 0, 0, value)
1030
# Emit D-Bus signal
1031
if old_value != self.approval_delay:
1032
self.PropertyChanged(dbus.String("ApprovalDelay"),
1033
dbus.UInt64(value, variant_level=1))
1034
1035
# ApprovalDuration - property
1036
@dbus_service_property(_interface, signature="t",
1037
access="readwrite")
1038
def ApprovalDuration_dbus_property(self, value=None):
1039
if value is None: # get
1040
return dbus.UInt64(self._timedelta_to_milliseconds(
1041
self.approval_duration))
1042
old_value = self.approval_duration
1043
self.approval_duration = datetime.timedelta(0, 0, 0, value)
1044
# Emit D-Bus signal
1045
if old_value != self.approval_duration:
1046
self.PropertyChanged(dbus.String("ApprovalDuration"),
1047
dbus.UInt64(value, variant_level=1))
1048
1049
# Name - property
1050
@dbus_service_property(_interface, signature="s", access="read")
1051
def Name_dbus_property(self):
1052
return dbus.String(self.name)
1053
1054
# Fingerprint - property
1055
@dbus_service_property(_interface, signature="s", access="read")
1056
def Fingerprint_dbus_property(self):
1057
return dbus.String(self.fingerprint)
1058
1059
# Host - property
1060
@dbus_service_property(_interface, signature="s",
1061
access="readwrite")
1062
def Host_dbus_property(self, value=None):
1063
if value is None: # get
1064
return dbus.String(self.host)
1065
old_value = self.host
1066
self.host = value
1067
# Emit D-Bus signal
1068
if old_value != self.host:
1069
self.PropertyChanged(dbus.String("Host"),
1070
dbus.String(value, variant_level=1))
1071
1072
# Created - property
1073
@dbus_service_property(_interface, signature="s", access="read")
1074
def Created_dbus_property(self):
1075
return dbus.String(self._datetime_to_dbus(self.created))
1076
1077
# LastEnabled - property
1078
@dbus_service_property(_interface, signature="s", access="read")
1079
def LastEnabled_dbus_property(self):
1080
return self._datetime_to_dbus(self.last_enabled)
1081
1082
# Enabled - property
1083
@dbus_service_property(_interface, signature="b",
1084
access="readwrite")
1085
def Enabled_dbus_property(self, value=None):
1086
if value is None: # get
1087
return dbus.Boolean(self.enabled)
1088
if value:
1089
self.enable()
1090
else:
1091
self.disable()
1092
1093
# LastCheckedOK - property
1094
@dbus_service_property(_interface, signature="s",
1095
access="readwrite")
1096
def LastCheckedOK_dbus_property(self, value=None):
1097
if value is not None:
1098
self.checked_ok()
1099
return
1100
return self._datetime_to_dbus(self.last_checked_ok)
1101
1102
# Expires - property
1103
@dbus_service_property(_interface, signature="s", access="read")
1104
def Expires_dbus_property(self):
1105
return self._datetime_to_dbus(self.expires)
1106
1107
# LastApprovalRequest - property
1108
@dbus_service_property(_interface, signature="s", access="read")
1109
def LastApprovalRequest_dbus_property(self):
1110
return self._datetime_to_dbus(self.last_approval_request)
1111
1112
# Timeout - property
1113
@dbus_service_property(_interface, signature="t",
1114
access="readwrite")
1115
def Timeout_dbus_property(self, value=None):
1116
if value is None: # get
1117
return dbus.UInt64(self.timeout_milliseconds())
1118
old_value = self.timeout
1119
self.timeout = datetime.timedelta(0, 0, 0, value)
1120
# Emit D-Bus signal
1121
if old_value != self.timeout:
1122
self.PropertyChanged(dbus.String("Timeout"),
1123
dbus.UInt64(value, variant_level=1))
1124
if getattr(self, "disable_initiator_tag", None) is None:
1125
return
1126
# Reschedule timeout
1127
gobject.source_remove(self.disable_initiator_tag)
1128
self.disable_initiator_tag = None
1129
self.expires = None
1130
time_to_die = (self.
1131
_timedelta_to_milliseconds((self
1132
.last_checked_ok
1133
+ self.timeout)
1134
- datetime.datetime
1135
.utcnow()))
1136
if time_to_die <= 0:
1137
# The timeout has passed
1138
self.disable()
1139
else:
1140
self.expires = (datetime.datetime.utcnow()
1141
+ datetime.timedelta(milliseconds = time_to_die))
1142
self.disable_initiator_tag = (gobject.timeout_add
1143
(time_to_die, self.disable))
1144
1145
# ExtendedTimeout - property
1146
@dbus_service_property(_interface, signature="t",
1147
access="readwrite")
1148
def ExtendedTimeout_dbus_property(self, value=None):
1149
if value is None: # get
1150
return dbus.UInt64(self.extended_timeout_milliseconds())
1151
old_value = self.extended_timeout
1152
self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1153
# Emit D-Bus signal
1154
if old_value != self.extended_timeout:
1155
self.PropertyChanged(dbus.String("ExtendedTimeout"),
1156
dbus.UInt64(value, variant_level=1))
1157
1158
# Interval - property
1159
@dbus_service_property(_interface, signature="t",
1160
access="readwrite")
1161
def Interval_dbus_property(self, value=None):
1162
if value is None: # get
1163
return dbus.UInt64(self.interval_milliseconds())
1164
old_value = self.interval
1165
self.interval = datetime.timedelta(0, 0, 0, value)
1166
# Emit D-Bus signal
1167
if old_value != self.interval:
1168
self.PropertyChanged(dbus.String("Interval"),
1169
dbus.UInt64(value, variant_level=1))
1170
if getattr(self, "checker_initiator_tag", None) is None:
1171
return
1172
# Reschedule checker run
1173
gobject.source_remove(self.checker_initiator_tag)
1174
self.checker_initiator_tag = (gobject.timeout_add
1175
(value, self.start_checker))
1176
self.start_checker() # Start one now, too
1177
1178
# Checker - property
1179
@dbus_service_property(_interface, signature="s",
1180
access="readwrite")
1181
def Checker_dbus_property(self, value=None):
1182
if value is None: # get
1183
return dbus.String(self.checker_command)
1184
old_value = self.checker_command
1185
self.checker_command = value
1186
# Emit D-Bus signal
1187
if old_value != self.checker_command:
1188
self.PropertyChanged(dbus.String("Checker"),
1189
dbus.String(self.checker_command,
1190
variant_level=1))
1191
1192
# CheckerRunning - property
1193
@dbus_service_property(_interface, signature="b",
1194
access="readwrite")
1195
def CheckerRunning_dbus_property(self, value=None):
1196
if value is None: # get
1197
return dbus.Boolean(self.checker is not None)
1198
if value:
1199
self.start_checker()
1200
else:
1201
self.stop_checker()
1202
1203
# ObjectPath - property
1204
@dbus_service_property(_interface, signature="o", access="read")
1205
def ObjectPath_dbus_property(self):
1206
return self.dbus_object_path # is already a dbus.ObjectPath
1207
1208
# Secret = property
1209
@dbus_service_property(_interface, signature="ay",
1210
access="write", byte_arrays=True)
1211
def Secret_dbus_property(self, value):
1212
self.secret = str(value)
1213
1214
del _interface
1215
1216
1217
class ProxyClient(object):
1218
def __init__(self, child_pipe, fpr, address):
1219
self._pipe = child_pipe
1220
self._pipe.send(('init', fpr, address))
1221
if not self._pipe.recv():
1222
raise KeyError()
1223
1224
def __getattribute__(self, name):
1225
if(name == '_pipe'):
1226
return super(ProxyClient, self).__getattribute__(name)
1227
self._pipe.send(('getattr', name))
1228
data = self._pipe.recv()
1229
if data[0] == 'data':
1230
return data[1]
1231
if data[0] == 'function':
1232
def func(*args, **kwargs):
1233
self._pipe.send(('funcall', name, args, kwargs))
1234
return self._pipe.recv()[1]
1235
return func
1236
1237
def __setattr__(self, name, value):
1238
if(name == '_pipe'):
1239
return super(ProxyClient, self).__setattr__(name, value)
1240
self._pipe.send(('setattr', name, value))
1241
1242
1243
class ClientHandler(socketserver.BaseRequestHandler, object):
1244
"""A class to handle client connections.
1245
1246
Instantiated once for each connection to handle it.
359
def still_valid(self):
360
"""Has the timeout not yet passed for this client?"""
361
now = datetime.datetime.now()
362
if self.last_checked_ok is None:
363
return now < (self.created + self.timeout)
364
else:
365
return now < (self.last_checked_ok + self.timeout)
366
367
368
def peer_certificate(session):
369
"Return the peer's OpenPGP certificate as a bytestring"
370
# If not an OpenPGP certificate...
371
if gnutls.library.functions.gnutls_certificate_type_get\
372
(session._c_object) \
373
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
374
# ...do the normal thing
375
return session.peer_certificate
376
list_size = ctypes.c_uint()
377
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
378
(session._c_object, ctypes.byref(list_size))
379
if list_size.value == 0:
380
return None
381
cert = cert_list[0]
382
return ctypes.string_at(cert.data, cert.size)
383
384
385
def fingerprint(openpgp):
386
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
387
# New GnuTLS "datum" with the OpenPGP public key
388
datum = gnutls.library.types.gnutls_datum_t\
389
(ctypes.cast(ctypes.c_char_p(openpgp),
390
ctypes.POINTER(ctypes.c_ubyte)),
391
ctypes.c_uint(len(openpgp)))
392
# New empty GnuTLS certificate
393
crt = gnutls.library.types.gnutls_openpgp_crt_t()
394
gnutls.library.functions.gnutls_openpgp_crt_init\
395
(ctypes.byref(crt))
396
# Import the OpenPGP public key into the certificate
397
gnutls.library.functions.gnutls_openpgp_crt_import\
398
(crt, ctypes.byref(datum),
399
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
400
# New buffer for the fingerprint
401
buffer = ctypes.create_string_buffer(20)
402
buffer_length = ctypes.c_size_t()
403
# Get the fingerprint from the certificate into the buffer
404
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
405
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
406
# Deinit the certificate
407
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
408
# Convert the buffer to a Python bytestring
409
fpr = ctypes.string_at(buffer, buffer_length.value)
410
# Convert the bytestring to hexadecimal notation
411
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
412
return hex_fpr
413
414
415
class tcp_handler(SocketServer.BaseRequestHandler, object):
416
"""A TCP request handler class.
417
Instantiated by IPv6_TCPServer for each request to handle it.
1247
418
Note: This will run in its own forked process."""
1248
419
1249
420
def handle(self):
1250
with contextlib.closing(self.server.child_pipe) as child_pipe:
1251
logger.info("TCP connection from: %s",
1252
unicode(self.client_address))
1253
logger.debug("Pipe FD: %d",
1254
self.server.child_pipe.fileno())
1255
1256
session = (gnutls.connection
1257
.ClientSession(self.request,
1258
gnutls.connection
1259
.X509Credentials()))
1260
1261
# Note: gnutls.connection.X509Credentials is really a
1262
# generic GnuTLS certificate credentials object so long as
1263
# no X.509 keys are added to it. Therefore, we can use it
1264
# here despite using OpenPGP certificates.
1265
1266
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
1267
# "+AES-256-CBC", "+SHA1",
1268
# "+COMP-NULL", "+CTYPE-OPENPGP",
1269
# "+DHE-DSS"))
1270
# Use a fallback default, since this MUST be set.
1271
priority = self.server.gnutls_priority
1272
if priority is None:
1273
priority = "NORMAL"
1274
(gnutls.library.functions
1275
.gnutls_priority_set_direct(session._c_object,
1276
priority, None))
1277
1278
# Start communication using the Mandos protocol
1279
# Get protocol number
1280
line = self.request.makefile().readline()
1281
logger.debug("Protocol version: %r", line)
1282
try:
1283
if int(line.strip().split()[0]) > 1:
1284
raise RuntimeError
1285
except (ValueError, IndexError, RuntimeError) as error:
1286
logger.error("Unknown protocol version: %s", error)
1287
return
1288
1289
# Start GnuTLS connection
1290
try:
1291
session.handshake()
1292
except gnutls.errors.GNUTLSError as error:
1293
logger.warning("Handshake failed: %s", error)
1294
# Do not run session.bye() here: the session is not
1295
# established. Just abandon the request.
1296
return
1297
logger.debug("Handshake succeeded")
1298
1299
approval_required = False
1300
try:
1301
try:
1302
fpr = self.fingerprint(self.peer_certificate
1303
(session))
1304
except (TypeError,
1305
gnutls.errors.GNUTLSError) as error:
1306
logger.warning("Bad certificate: %s", error)
1307
return
1308
logger.debug("Fingerprint: %s", fpr)
1309
1310
try:
1311
client = ProxyClient(child_pipe, fpr,
1312
self.client_address)
1313
except KeyError:
1314
return
1315
1316
if client.approval_delay:
1317
delay = client.approval_delay
1318
client.approvals_pending += 1
1319
approval_required = True
1320
1321
while True:
1322
if not client.enabled:
1323
logger.info("Client %s is disabled",
1324
client.name)
1325
if self.server.use_dbus:
1326
# Emit D-Bus signal
1327
client.Rejected("Disabled")
1328
return
1329
1330
if client._approved or not client.approval_delay:
1331
#We are approved or approval is disabled
1332
break
1333
elif client._approved is None:
1334
logger.info("Client %s needs approval",
1335
client.name)
1336
if self.server.use_dbus:
1337
# Emit D-Bus signal
1338
client.NeedApproval(
1339
client.approval_delay_milliseconds(),
1340
client.approved_by_default)
1341
else:
1342
logger.warning("Client %s was not approved",
1343
client.name)
1344
if self.server.use_dbus:
1345
# Emit D-Bus signal
1346
client.Rejected("Denied")
1347
return
1348
1349
#wait until timeout or approved
1350
#x = float(client._timedelta_to_milliseconds(delay))
1351
time = datetime.datetime.now()
1352
client.changedstate.acquire()
1353
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1354
client.changedstate.release()
1355
time2 = datetime.datetime.now()
1356
if (time2 - time) >= delay:
1357
if not client.approved_by_default:
1358
logger.warning("Client %s timed out while"
1359
" waiting for approval",
1360
client.name)
1361
if self.server.use_dbus:
1362
# Emit D-Bus signal
1363
client.Rejected("Approval timed out")
1364
return
1365
else:
1366
break
1367
else:
1368
delay -= time2 - time
1369
1370
sent_size = 0
1371
while sent_size < len(client.secret):
1372
try:
1373
sent = session.send(client.secret[sent_size:])
1374
except gnutls.errors.GNUTLSError as error:
1375
logger.warning("gnutls send failed")
1376
return
1377
logger.debug("Sent: %d, remaining: %d",
1378
sent, len(client.secret)
1379
- (sent_size + sent))
1380
sent_size += sent
1381
1382
logger.info("Sending secret to %s", client.name)
1383
# bump the timeout as if seen
1384
client.checked_ok(client.extended_timeout)
1385
if self.server.use_dbus:
1386
# Emit D-Bus signal
1387
client.GotSecret()
1388
1389
finally:
1390
if approval_required:
1391
client.approvals_pending -= 1
1392
try:
1393
session.bye()
1394
except gnutls.errors.GNUTLSError as error:
1395
logger.warning("GnuTLS bye failed")
1396
1397
@staticmethod
1398
def peer_certificate(session):
1399
"Return the peer's OpenPGP certificate as a bytestring"
1400
# If not an OpenPGP certificate...
1401
if (gnutls.library.functions
1402
.gnutls_certificate_type_get(session._c_object)
1403
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1404
# ...do the normal thing
1405
return session.peer_certificate
1406
list_size = ctypes.c_uint(1)
1407
cert_list = (gnutls.library.functions
1408
.gnutls_certificate_get_peers
1409
(session._c_object, ctypes.byref(list_size)))
1410
if not bool(cert_list) and list_size.value != 0:
1411
raise gnutls.errors.GNUTLSError("error getting peer"
1412
" certificate")
1413
if list_size.value == 0:
1414
return None
1415
cert = cert_list[0]
1416
return ctypes.string_at(cert.data, cert.size)
1417
1418
@staticmethod
1419
def fingerprint(openpgp):
1420
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1421
# New GnuTLS "datum" with the OpenPGP public key
1422
datum = (gnutls.library.types
1423
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1424
ctypes.POINTER
1425
(ctypes.c_ubyte)),
1426
ctypes.c_uint(len(openpgp))))
1427
# New empty GnuTLS certificate
1428
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1429
(gnutls.library.functions
1430
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1431
# Import the OpenPGP public key into the certificate
1432
(gnutls.library.functions
1433
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1434
gnutls.library.constants
1435
.GNUTLS_OPENPGP_FMT_RAW))
1436
# Verify the self signature in the key
1437
crtverify = ctypes.c_uint()
1438
(gnutls.library.functions
1439
.gnutls_openpgp_crt_verify_self(crt, 0,
1440
ctypes.byref(crtverify)))
1441
if crtverify.value != 0:
1442
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1443
raise (gnutls.errors.CertificateSecurityError
1444
("Verify failed"))
1445
# New buffer for the fingerprint
1446
buf = ctypes.create_string_buffer(20)
1447
buf_len = ctypes.c_size_t()
1448
# Get the fingerprint from the certificate into the buffer
1449
(gnutls.library.functions
1450
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1451
ctypes.byref(buf_len)))
1452
# Deinit the certificate
1453
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1454
# Convert the buffer to a Python bytestring
1455
fpr = ctypes.string_at(buf, buf_len.value)
1456
# Convert the bytestring to hexadecimal notation
1457
hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1458
return hex_fpr
1459
1460
1461
class MultiprocessingMixIn(object):
1462
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1463
def sub_process_main(self, request, address):
1464
try:
1465
self.finish_request(request, address)
1466
except:
1467
self.handle_error(request, address)
1468
self.close_request(request)
1469
1470
def process_request(self, request, address):
1471
"""Start a new process to process the request."""
1472
multiprocessing.Process(target = self.sub_process_main,
1473
args = (request, address)).start()
1474
1475
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1476
""" adds a pipe to the MixIn """
1477
def process_request(self, request, client_address):
1478
"""Overrides and wraps the original process_request().
1479
1480
This function creates a new pipe in self.pipe
1481
"""
1482
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1483
1484
super(MultiprocessingMixInWithPipe,
1485
self).process_request(request, client_address)
1486
self.child_pipe.close()
1487
self.add_pipe(parent_pipe)
1488
1489
def add_pipe(self, parent_pipe):
1490
"""Dummy function; override as necessary"""
1491
raise NotImplementedError
1492
1493
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1494
socketserver.TCPServer, object):
1495
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1496
421
logger.info(u"TCP connection from: %s",
422
unicode(self.client_address))
423
session = gnutls.connection.ClientSession\
424
(self.request, gnutls.connection.X509Credentials())
425
426
line = self.request.makefile().readline()
427
logger.debug(u"Protocol version: %r", line)
428
try:
429
if int(line.strip().split()[0]) > 1:
430
raise RuntimeError
431
except (ValueError, IndexError, RuntimeError), error:
432
logger.error(u"Unknown protocol version: %s", error)
433
return
434
435
# Note: gnutls.connection.X509Credentials is really a generic
436
# GnuTLS certificate credentials object so long as no X.509
437
# keys are added to it. Therefore, we can use it here despite
438
# using OpenPGP certificates.
439
440
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
441
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
442
# "+DHE-DSS"))
443
priority = "NORMAL" # Fallback default, since this
444
# MUST be set.
445
if self.server.settings["priority"]:
446
priority = self.server.settings["priority"]
447
gnutls.library.functions.gnutls_priority_set_direct\
448
(session._c_object, priority, None);
449
450
try:
451
session.handshake()
452
except gnutls.errors.GNUTLSError, error:
453
logger.warning(u"Handshake failed: %s", error)
454
# Do not run session.bye() here: the session is not
455
# established. Just abandon the request.
456
return
457
try:
458
fpr = fingerprint(peer_certificate(session))
459
except (TypeError, gnutls.errors.GNUTLSError), error:
460
logger.warning(u"Bad certificate: %s", error)
461
session.bye()
462
return
463
logger.debug(u"Fingerprint: %s", fpr)
464
client = None
465
for c in self.server.clients:
466
if c.fingerprint == fpr:
467
client = c
468
break
469
if not client:
470
logger.warning(u"Client not found for fingerprint: %s",
471
fpr)
472
session.bye()
473
return
474
# Have to check if client.still_valid(), since it is possible
475
# that the client timed out while establishing the GnuTLS
476
# session.
477
if not client.still_valid():
478
logger.warning(u"Client %(name)s is invalid",
479
vars(client))
480
session.bye()
481
return
482
sent_size = 0
483
while sent_size < len(client.secret):
484
sent = session.send(client.secret[sent_size:])
485
logger.debug(u"Sent: %d, remaining: %d",
486
sent, len(client.secret)
487
- (sent_size + sent))
488
sent_size += sent
489
session.bye()
490
491
492
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
493
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1497
494
Attributes:
1498
enabled: Boolean; whether this server is activated yet
1499
interface: None or a network interface name (string)
1500
use_ipv6: Boolean; to use IPv6 or not
495
settings: Server settings
496
clients: Set() of Client objects
1501
497
"""
1502
def __init__(self, server_address, RequestHandlerClass,
1503
interface=None, use_ipv6=True):
1504
self.interface = interface
1505
if use_ipv6:
1506
self.address_family = socket.AF_INET6
1507
socketserver.TCPServer.__init__(self, server_address,
1508
RequestHandlerClass)
498
address_family = socket.AF_INET6
499
def __init__(self, *args, **kwargs):
500
if "settings" in kwargs:
501
self.settings = kwargs["settings"]
502
del kwargs["settings"]
503
if "clients" in kwargs:
504
self.clients = kwargs["clients"]
505
del kwargs["clients"]
506
return super(type(self), self).__init__(*args, **kwargs)
1509
507
def server_bind(self):
1510
508
"""This overrides the normal server_bind() function
1511
509
to bind to an interface if one was specified, and also NOT to
1512
510
bind to an address or port if they were not specified."""
1513
if self.interface is not None:
1514
if SO_BINDTODEVICE is None:
1515
logger.error("SO_BINDTODEVICE does not exist;"
1516
" cannot bind to interface %s",
1517
self.interface)
1518
else:
1519
try:
1520
self.socket.setsockopt(socket.SOL_SOCKET,
1521
SO_BINDTODEVICE,
1522
str(self.interface
1523
+ '\0'))
1524
except socket.error as error:
1525
if error[0] == errno.EPERM:
1526
logger.error("No permission to"
1527
" bind to interface %s",
1528
self.interface)
1529
elif error[0] == errno.ENOPROTOOPT:
1530
logger.error("SO_BINDTODEVICE not available;"
1531
" cannot bind to interface %s",
1532
self.interface)
1533
else:
1534
raise
511
if self.settings["interface"]:
512
# 25 is from /usr/include/asm-i486/socket.h
513
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
514
try:
515
self.socket.setsockopt(socket.SOL_SOCKET,
516
SO_BINDTODEVICE,
517
self.settings["interface"])
518
except socket.error, error:
519
if error[0] == errno.EPERM:
520
logger.error(u"No permission to"
521
u" bind to interface %s",
522
self.settings["interface"])
523
else:
524
raise error
1535
525
# Only bind(2) the socket if we really need to.
1536
526
if self.server_address[0] or self.server_address[1]:
1537
527
if not self.server_address[0]:
1538
if self.address_family == socket.AF_INET6:
1539
any_address = "::" # in6addr_any
1540
else:
1541
any_address = socket.INADDR_ANY
1542
self.server_address = (any_address,
528
in6addr_any = "::"
529
self.server_address = (in6addr_any,
1543
530
self.server_address[1])
1544
531
elif not self.server_address[1]:
1545
532
self.server_address = (self.server_address[0],
1546
533
0)
1547
# if self.interface:
534
# if self.settings["interface"]:
1548
535
# self.server_address = (self.server_address[0],
1549
536
# 0, # port
1550
537
# 0, # flowinfo
1551
538
# if_nametoindex
1552
# (self.interface))
1553
return socketserver.TCPServer.server_bind(self)
1554
1555
1556
class MandosServer(IPv6_TCPServer):
1557
"""Mandos server.
1558
1559
Attributes:
1560
clients: set of Client objects
1561
gnutls_priority GnuTLS priority string
1562
use_dbus: Boolean; to emit D-Bus signals or not
1563
1564
Assumes a gobject.MainLoop event loop.
1565
"""
1566
def __init__(self, server_address, RequestHandlerClass,
1567
interface=None, use_ipv6=True, clients=None,
1568
gnutls_priority=None, use_dbus=True):
1569
self.enabled = False
1570
self.clients = clients
1571
if self.clients is None:
1572
self.clients = set()
1573
self.use_dbus = use_dbus
1574
self.gnutls_priority = gnutls_priority
1575
IPv6_TCPServer.__init__(self, server_address,
1576
RequestHandlerClass,
1577
interface = interface,
1578
use_ipv6 = use_ipv6)
1579
def server_activate(self):
1580
if self.enabled:
1581
return socketserver.TCPServer.server_activate(self)
1582
def enable(self):
1583
self.enabled = True
1584
def add_pipe(self, parent_pipe):
1585
# Call "handle_ipc" for both data and EOF events
1586
gobject.io_add_watch(parent_pipe.fileno(),
1587
gobject.IO_IN | gobject.IO_HUP,
1588
functools.partial(self.handle_ipc,
1589
parent_pipe = parent_pipe))
1590
1591
def handle_ipc(self, source, condition, parent_pipe=None,
1592
client_object=None):
1593
condition_names = {
1594
gobject.IO_IN: "IN", # There is data to read.
1595
gobject.IO_OUT: "OUT", # Data can be written (without
1596
# blocking).
1597
gobject.IO_PRI: "PRI", # There is urgent data to read.
1598
gobject.IO_ERR: "ERR", # Error condition.
1599
gobject.IO_HUP: "HUP" # Hung up (the connection has been
1600
# broken, usually for pipes and
1601
# sockets).
1602
}
1603
conditions_string = ' | '.join(name
1604
for cond, name in
1605
condition_names.iteritems()
1606
if cond & condition)
1607
# error or the other end of multiprocessing.Pipe has closed
1608
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1609
return False
1610
1611
# Read a request from the child
1612
request = parent_pipe.recv()
1613
command = request[0]
1614
1615
if command == 'init':
1616
fpr = request[1]
1617
address = request[2]
1618
1619
for c in self.clients:
1620
if c.fingerprint == fpr:
1621
client = c
1622
break
1623
else:
1624
logger.info("Client not found for fingerprint: %s, ad"
1625
"dress: %s", fpr, address)
1626
if self.use_dbus:
1627
# Emit D-Bus signal
1628
mandos_dbus_service.ClientNotFound(fpr, address[0])
1629
parent_pipe.send(False)
1630
return False
1631
1632
gobject.io_add_watch(parent_pipe.fileno(),
1633
gobject.IO_IN | gobject.IO_HUP,
1634
functools.partial(self.handle_ipc,
1635
parent_pipe = parent_pipe,
1636
client_object = client))
1637
parent_pipe.send(True)
1638
# remove the old hook in favor of the new above hook on same fileno
1639
return False
1640
if command == 'funcall':
1641
funcname = request[1]
1642
args = request[2]
1643
kwargs = request[3]
1644
1645
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1646
1647
if command == 'getattr':
1648
attrname = request[1]
1649
if callable(client_object.__getattribute__(attrname)):
1650
parent_pipe.send(('function',))
1651
else:
1652
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1653
1654
if command == 'setattr':
1655
attrname = request[1]
1656
value = request[2]
1657
setattr(client_object, attrname, value)
1658
1659
return True
539
# (self.settings
540
# ["interface"]))
541
return super(type(self), self).server_bind()
1660
542
1661
543
1662
544
def string_to_delta(interval):
1663
545
"""Parse a string and return a datetime.timedelta
1664
546
1665
547
>>> string_to_delta('7d')
1666
548
datetime.timedelta(7)
1667
549
>>> string_to_delta('60s')
1670
552
datetime.timedelta(0, 3600)
1671
553
>>> string_to_delta('24h')
1672
554
datetime.timedelta(1)
1673
>>> string_to_delta('1w')
555
>>> string_to_delta(u'1w')
1674
556
datetime.timedelta(7)
1675
>>> string_to_delta('5m 30s')
1676
datetime.timedelta(0, 330)
1677
557
"""
1678
timevalue = datetime.timedelta(0)
1679
for s in interval.split():
1680
try:
1681
suffix = unicode(s[-1])
1682
value = int(s[:-1])
1683
if suffix == "d":
1684
delta = datetime.timedelta(value)
1685
elif suffix == "s":
1686
delta = datetime.timedelta(0, value)
1687
elif suffix == "m":
1688
delta = datetime.timedelta(0, 0, 0, 0, value)
1689
elif suffix == "h":
1690
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1691
elif suffix == "w":
1692
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1693
else:
1694
raise ValueError("Unknown suffix %r" % suffix)
1695
except (ValueError, IndexError) as e:
1696
raise ValueError(*(e.args))
1697
timevalue += delta
1698
return timevalue
1699
558
try:
559
suffix=unicode(interval[-1])
560
value=int(interval[:-1])
561
if suffix == u"d":
562
delta = datetime.timedelta(value)
563
elif suffix == u"s":
564
delta = datetime.timedelta(0, value)
565
elif suffix == u"m":
566
delta = datetime.timedelta(0, 0, 0, 0, value)
567
elif suffix == u"h":
568
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
569
elif suffix == u"w":
570
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
571
else:
572
raise ValueError
573
except (ValueError, IndexError):
574
raise ValueError
575
return delta
576
577
578
def server_state_changed(state):
579
"""Derived from the Avahi example code"""
580
if state == avahi.SERVER_COLLISION:
581
logger.error(u"Server name collision")
582
service.remove()
583
elif state == avahi.SERVER_RUNNING:
584
service.add()
585
586
587
def entry_group_state_changed(state, error):
588
"""Derived from the Avahi example code"""
589
logger.debug(u"state change: %i", state)
590
591
if state == avahi.ENTRY_GROUP_ESTABLISHED:
592
logger.debug(u"Service established.")
593
elif state == avahi.ENTRY_GROUP_COLLISION:
594
logger.warning(u"Service name collision.")
595
service.rename()
596
elif state == avahi.ENTRY_GROUP_FAILURE:
597
logger.critical(u"Error in group state changed %s",
598
unicode(error))
599
raise AvahiGroupError("State changed: %s", str(error))
1700
600
1701
601
def if_nametoindex(interface):
1702
"""Call the C function if_nametoindex(), or equivalent
1703
1704
Note: This function cannot accept a unicode string."""
602
"""Call the C function if_nametoindex(), or equivalent"""
1705
603
global if_nametoindex
1706
604
try:
1707
if_nametoindex = (ctypes.cdll.LoadLibrary
1708
(ctypes.util.find_library("c"))
1709
.if_nametoindex)
605
if "ctypes.util" not in sys.modules:
606
import ctypes.util
607
if_nametoindex = ctypes.cdll.LoadLibrary\
608
(ctypes.util.find_library("c")).if_nametoindex
1710
609
except (OSError, AttributeError):
1711
logger.warning("Doing if_nametoindex the hard way")
610
if "struct" not in sys.modules:
611
import struct
612
if "fcntl" not in sys.modules:
613
import fcntl
1712
614
def if_nametoindex(interface):
1713
615
"Get an interface index the hard way, i.e. using fcntl()"
1714
616
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1715
with contextlib.closing(socket.socket()) as s:
1716
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1717
struct.pack(str("16s16x"),
1718
interface))
1719
interface_index = struct.unpack(str("I"),
1720
ifreq[16:20])[0]
617
s = socket.socket()
618
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
619
struct.pack("16s16x", interface))
620
s.close()
621
interface_index = struct.unpack("I", ifreq[16:20])[0]
1721
622
return interface_index
1722
623
return if_nametoindex(interface)
1723
624
1724
625
1725
626
def daemon(nochdir = False, noclose = False):
1726
627
"""See daemon(3). Standard BSD Unix function.
1727
1728
628
This should really exist as os.daemon, but it doesn't (yet)."""
1729
629
if os.fork():
1730
630
sys.exit()
1738
638
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1739
639
if not stat.S_ISCHR(os.fstat(null).st_mode):
1740
640
raise OSError(errno.ENODEV,
1741
"%s not a character device"
1742
% os.path.devnull)
641
"/dev/null not a character device")
1743
642
os.dup2(null, sys.stdin.fileno())
1744
643
os.dup2(null, sys.stdout.fileno())
1745
644
os.dup2(null, sys.stderr.fileno())
1748
647
1749
648
1750
649
def main():
1751
1752
##################################################################
1753
# Parsing of options, both command line and config file
1754
1755
parser = argparse.ArgumentParser()
1756
parser.add_argument("-v", "--version", action="version",
1757
version = "%%(prog)s %s" % version,
1758
help="show version number and exit")
1759
parser.add_argument("-i", "--interface", metavar="IF",
1760
help="Bind to interface IF")
1761
parser.add_argument("-a", "--address",
1762
help="Address to listen for requests on")
1763
parser.add_argument("-p", "--port", type=int,
1764
help="Port number to receive requests on")
1765
parser.add_argument("--check", action="store_true",
1766
help="Run self-test")
1767
parser.add_argument("--debug", action="store_true",
1768
help="Debug mode; run in foreground and log"
1769
" to terminal")
1770
parser.add_argument("--debuglevel", metavar="LEVEL",
1771
help="Debug level for stdout output")
1772
parser.add_argument("--priority", help="GnuTLS"
1773
" priority string (see GnuTLS documentation)")
1774
parser.add_argument("--servicename",
1775
metavar="NAME", help="Zeroconf service name")
1776
parser.add_argument("--configdir",
1777
default="/etc/mandos", metavar="DIR",
1778
help="Directory to search for configuration"
1779
" files")
1780
parser.add_argument("--no-dbus", action="store_false",
1781
dest="use_dbus", help="Do not provide D-Bus"
1782
" system bus interface")
1783
parser.add_argument("--no-ipv6", action="store_false",
1784
dest="use_ipv6", help="Do not use IPv6")
1785
options = parser.parse_args()
650
global main_loop_started
651
main_loop_started = False
652
653
parser = OptionParser()
654
parser.add_option("-i", "--interface", type="string",
655
metavar="IF", help="Bind to interface IF")
656
parser.add_option("-a", "--address", type="string",
657
help="Address to listen for requests on")
658
parser.add_option("-p", "--port", type="int",
659
help="Port number to receive requests on")
660
parser.add_option("--check", action="store_true", default=False,
661
help="Run self-test")
662
parser.add_option("--debug", action="store_true",
663
help="Debug mode; run in foreground and log to"
664
" terminal")
665
parser.add_option("--priority", type="string", help="GnuTLS"
666
" priority string (see GnuTLS documentation)")
667
parser.add_option("--servicename", type="string", metavar="NAME",
668
help="Zeroconf service name")
669
parser.add_option("--configdir", type="string",
670
default="/etc/mandos", metavar="DIR",
671
help="Directory to search for configuration"
672
" files")
673
(options, args) = parser.parse_args()
1786
674
1787
675
if options.check:
1788
676
import doctest
1797
685
"priority":
1798
686
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1799
687
"servicename": "Mandos",
1800
"use_dbus": "True",
1801
"use_ipv6": "True",
1802
"debuglevel": "",
1803
688
}
1804
689
1805
690
# Parse config file for server-global settings
1806
server_config = configparser.SafeConfigParser(server_defaults)
691
server_config = ConfigParser.SafeConfigParser(server_defaults)
1807
692
del server_defaults
1808
server_config.read(os.path.join(options.configdir,
1809
"mandos.conf"))
693
server_config.read(os.path.join(options.configdir, "mandos.conf"))
694
server_section = "server"
1810
695
# Convert the SafeConfigParser object to a dict
1811
server_settings = server_config.defaults()
1812
# Use the appropriate methods on the non-string config options
1813
for option in ("debug", "use_dbus", "use_ipv6"):
1814
server_settings[option] = server_config.getboolean("DEFAULT",
1815
option)
1816
if server_settings["port"]:
1817
server_settings["port"] = server_config.getint("DEFAULT",
1818
"port")
696
server_settings = dict(server_config.items(server_section))
697
# Use getboolean on the boolean config option
698
server_settings["debug"] = server_config.getboolean\
699
(server_section, "debug")
1819
700
del server_config
1820
701
1821
702
# Override the settings from the config file with command line
1822
703
# options, if set.
1823
704
for option in ("interface", "address", "port", "debug",
1824
"priority", "servicename", "configdir",
1825
"use_dbus", "use_ipv6", "debuglevel"):
705
"priority", "servicename", "configdir"):
1826
706
value = getattr(options, option)
1827
707
if value is not None:
1828
708
server_settings[option] = value
1829
709
del options
1830
# Force all strings to be unicode
1831
for option in server_settings.keys():
1832
if type(server_settings[option]) is str:
1833
server_settings[option] = unicode(server_settings[option])
1834
710
# Now we have our good server settings in "server_settings"
1835
711
1836
##################################################################
1837
1838
# For convenience
1839
debug = server_settings["debug"]
1840
debuglevel = server_settings["debuglevel"]
1841
use_dbus = server_settings["use_dbus"]
1842
use_ipv6 = server_settings["use_ipv6"]
1843
1844
if server_settings["servicename"] != "Mandos":
1845
syslogger.setFormatter(logging.Formatter
1846
('Mandos (%s) [%%(process)d]:'
1847
' %%(levelname)s: %%(message)s'
1848
% server_settings["servicename"]))
1849
1850
712
# Parse config file with clients
1851
client_defaults = { "timeout": "5m",
1852
"extended_timeout": "15m",
1853
"interval": "2m",
713
client_defaults = { "timeout": "1h",
714
"interval": "5m",
1854
715
"checker": "fping -q -- %%(host)s",
1855
"host": "",
1856
"approval_delay": "0s",
1857
"approval_duration": "1s",
1858
716
}
1859
client_config = configparser.SafeConfigParser(client_defaults)
717
client_config = ConfigParser.SafeConfigParser(client_defaults)
1860
718
client_config.read(os.path.join(server_settings["configdir"],
1861
719
"clients.conf"))
1862
720
1863
global mandos_dbus_service
1864
mandos_dbus_service = None
1865
1866
tcp_server = MandosServer((server_settings["address"],
1867
server_settings["port"]),
1868
ClientHandler,
1869
interface=(server_settings["interface"]
1870
or None),
1871
use_ipv6=use_ipv6,
1872
gnutls_priority=
1873
server_settings["priority"],
1874
use_dbus=use_dbus)
1875
if not debug:
1876
pidfilename = "/var/run/mandos.pid"
1877
try:
1878
pidfile = open(pidfilename, "w")
1879
except IOError:
1880
logger.error("Could not open file %r", pidfilename)
1881
1882
try:
1883
uid = pwd.getpwnam("_mandos").pw_uid
1884
gid = pwd.getpwnam("_mandos").pw_gid
1885
except KeyError:
1886
try:
1887
uid = pwd.getpwnam("mandos").pw_uid
1888
gid = pwd.getpwnam("mandos").pw_gid
1889
except KeyError:
1890
try:
1891
uid = pwd.getpwnam("nobody").pw_uid
1892
gid = pwd.getpwnam("nobody").pw_gid
1893
except KeyError:
1894
uid = 65534
1895
gid = 65534
1896
try:
1897
os.setgid(gid)
1898
os.setuid(uid)
1899
except OSError as error:
1900
if error[0] != errno.EPERM:
1901
raise error
1902
1903
if not debug and not debuglevel:
1904
syslogger.setLevel(logging.WARNING)
1905
console.setLevel(logging.WARNING)
1906
if debuglevel:
1907
level = getattr(logging, debuglevel.upper())
1908
syslogger.setLevel(level)
1909
console.setLevel(level)
1910
1911
if debug:
1912
# Enable all possible GnuTLS debugging
1913
1914
# "Use a log level over 10 to enable all debugging options."
1915
# - GnuTLS manual
1916
gnutls.library.functions.gnutls_global_set_log_level(11)
1917
1918
@gnutls.library.types.gnutls_log_func
1919
def debug_gnutls(level, string):
1920
logger.debug("GnuTLS: %s", string[:-1])
1921
1922
(gnutls.library.functions
1923
.gnutls_global_set_log_function(debug_gnutls))
1924
1925
# Redirect stdin so all checkers get /dev/null
1926
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1927
os.dup2(null, sys.stdin.fileno())
1928
if null > 2:
1929
os.close(null)
1930
else:
1931
# No console logging
1932
logger.removeHandler(console)
1933
1934
# Need to fork before connecting to D-Bus
1935
if not debug:
1936
# Close all input and output, do double fork, etc.
1937
daemon()
721
global service
722
service = AvahiService(name = server_settings["servicename"],
723
type = "_mandos._tcp", );
724
if server_settings["interface"]:
725
service.interface = if_nametoindex(server_settings["interface"])
1938
726
1939
727
global main_loop
728
global bus
729
global server
1940
730
# From the Avahi example code
1941
731
DBusGMainLoop(set_as_default=True )
1942
732
main_loop = gobject.MainLoop()
1943
733
bus = dbus.SystemBus()
734
server = dbus.Interface(
735
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
736
avahi.DBUS_INTERFACE_SERVER )
1944
737
# End of Avahi example code
1945
if use_dbus:
1946
try:
1947
bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1948
bus, do_not_queue=True)
1949
except dbus.exceptions.NameExistsException as e:
1950
logger.error(unicode(e) + ", disabling D-Bus")
1951
use_dbus = False
1952
server_settings["use_dbus"] = False
1953
tcp_server.use_dbus = False
1954
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1955
service = AvahiService(name = server_settings["servicename"],
1956
servicetype = "_mandos._tcp",
1957
protocol = protocol, bus = bus)
1958
if server_settings["interface"]:
1959
service.interface = (if_nametoindex
1960
(str(server_settings["interface"])))
1961
1962
global multiprocessing_manager
1963
multiprocessing_manager = multiprocessing.Manager()
1964
1965
client_class = Client
1966
if use_dbus:
1967
client_class = functools.partial(ClientDBus, bus = bus)
1968
def client_config_items(config, section):
1969
special_settings = {
1970
"approved_by_default":
1971
lambda: config.getboolean(section,
1972
"approved_by_default"),
1973
}
1974
for name, value in config.items(section):
1975
try:
1976
yield (name, special_settings[name]())
1977
except KeyError:
1978
yield (name, value)
1979
1980
tcp_server.clients.update(set(
1981
client_class(name = section,
1982
config= dict(client_config_items(
1983
client_config, section)))
1984
for section in client_config.sections()))
1985
if not tcp_server.clients:
1986
logger.warning("No clients defined")
1987
1988
if not debug:
1989
try:
1990
with pidfile:
1991
pid = os.getpid()
1992
pidfile.write(str(pid) + "\n".encode("utf-8"))
1993
del pidfile
1994
except IOError:
1995
logger.error("Could not write to file %r with PID %d",
1996
pidfilename, pid)
1997
except NameError:
1998
# "pidfile" was never created
1999
pass
2000
del pidfilename
2001
738
739
debug = server_settings["debug"]
740
741
if debug:
742
console = logging.StreamHandler()
743
# console.setLevel(logging.DEBUG)
744
console.setFormatter(logging.Formatter\
745
('%(levelname)s: %(message)s'))
746
logger.addHandler(console)
747
del console
748
749
clients = Set()
750
def remove_from_clients(client):
751
clients.remove(client)
752
if not clients:
753
logger.critical(u"No clients left, exiting")
754
sys.exit()
755
756
clients.update(Set(Client(name = section,
757
stop_hook = remove_from_clients,
758
config
759
= dict(client_config.items(section)))
760
for section in client_config.sections()))
761
if not clients:
762
logger.critical(u"No clients defined")
763
sys.exit(1)
764
765
if not debug:
766
daemon()
767
768
pidfilename = "/var/run/mandos/mandos.pid"
769
pid = os.getpid()
770
try:
771
pidfile = open(pidfilename, "w")
772
pidfile.write(str(pid) + "\n")
773
pidfile.close()
774
del pidfile
775
except IOError, err:
776
logger.error(u"Could not write %s file with PID %d",
777
pidfilename, os.getpid())
778
779
def cleanup():
780
"Cleanup function; run on exit"
781
global group
782
# From the Avahi example code
783
if not group is None:
784
group.Free()
785
group = None
786
# End of Avahi example code
787
788
while clients:
789
client = clients.pop()
790
client.stop_hook = None
791
client.stop()
792
793
atexit.register(cleanup)
794
795
if not debug:
2002
796
signal.signal(signal.SIGINT, signal.SIG_IGN)
2003
2004
797
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2005
798
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2006
799
2007
if use_dbus:
2008
class MandosDBusService(dbus.service.Object):
2009
"""A D-Bus proxy object"""
2010
def __init__(self):
2011
dbus.service.Object.__init__(self, bus, "/")
2012
_interface = "se.bsnet.fukt.Mandos"
2013
2014
@dbus.service.signal(_interface, signature="o")
2015
def ClientAdded(self, objpath):
2016
"D-Bus signal"
2017
pass
2018
2019
@dbus.service.signal(_interface, signature="ss")
2020
def ClientNotFound(self, fingerprint, address):
2021
"D-Bus signal"
2022
pass
2023
2024
@dbus.service.signal(_interface, signature="os")
2025
def ClientRemoved(self, objpath, name):
2026
"D-Bus signal"
2027
pass
2028
2029
@dbus.service.method(_interface, out_signature="ao")
2030
def GetAllClients(self):
2031
"D-Bus method"
2032
return dbus.Array(c.dbus_object_path
2033
for c in tcp_server.clients)
2034
2035
@dbus.service.method(_interface,
2036
out_signature="a{oa{sv}}")
2037
def GetAllClientsWithProperties(self):
2038
"D-Bus method"
2039
return dbus.Dictionary(
2040
((c.dbus_object_path, c.GetAll(""))
2041
for c in tcp_server.clients),
2042
signature="oa{sv}")
2043
2044
@dbus.service.method(_interface, in_signature="o")
2045
def RemoveClient(self, object_path):
2046
"D-Bus method"
2047
for c in tcp_server.clients:
2048
if c.dbus_object_path == object_path:
2049
tcp_server.clients.remove(c)
2050
c.remove_from_connection()
2051
# Don't signal anything except ClientRemoved
2052
c.disable(quiet=True)
2053
# Emit D-Bus signal
2054
self.ClientRemoved(object_path, c.name)
2055
return
2056
raise KeyError(object_path)
2057
2058
del _interface
2059
2060
mandos_dbus_service = MandosDBusService()
2061
2062
def cleanup():
2063
"Cleanup function; run on exit"
2064
service.cleanup()
2065
2066
while tcp_server.clients:
2067
client = tcp_server.clients.pop()
2068
if use_dbus:
2069
client.remove_from_connection()
2070
client.disable_hook = None
2071
# Don't signal anything except ClientRemoved
2072
client.disable(quiet=True)
2073
if use_dbus:
2074
# Emit D-Bus signal
2075
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2076
client.name)
2077
2078
atexit.register(cleanup)
2079
2080
for client in tcp_server.clients:
2081
if use_dbus:
2082
# Emit D-Bus signal
2083
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2084
client.enable()
2085
2086
tcp_server.enable()
2087
tcp_server.server_activate()
2088
800
for client in clients:
801
client.start()
802
803
tcp_server = IPv6_TCPServer((server_settings["address"],
804
server_settings["port"]),
805
tcp_handler,
806
settings=server_settings,
807
clients=clients)
2089
808
# Find out what port we got
2090
809
service.port = tcp_server.socket.getsockname()[1]
2091
if use_ipv6:
2092
logger.info("Now listening on address %r, port %d,"
2093
" flowinfo %d, scope_id %d"
2094
% tcp_server.socket.getsockname())
2095
else: # IPv4
2096
logger.info("Now listening on address %r, port %d"
2097
% tcp_server.socket.getsockname())
810
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
811
u" scope_id %d" % tcp_server.socket.getsockname())
2098
812
2099
813
#service.interface = tcp_server.socket.getsockname()[3]
2100
814
2101
815
try:
2102
816
# From the Avahi example code
817
server.connect_to_signal("StateChanged", server_state_changed)
2103
818
try:
2104
service.activate()
2105
except dbus.exceptions.DBusException as error:
2106
logger.critical("DBusException: %s", error)
2107
cleanup()
819
server_state_changed(server.GetState())
820
except dbus.exceptions.DBusException, error:
821
logger.critical(u"DBusException: %s", error)
2108
822
sys.exit(1)
2109
823
# End of Avahi example code
2110
824
2111
825
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2112
826
lambda *args, **kwargs:
2113
(tcp_server.handle_request
2114
(*args[2:], **kwargs) or True))
827
tcp_server.handle_request\
828
(*args[2:], **kwargs) or True)
2115
829
2116
logger.debug("Starting main loop")
830
logger.debug(u"Starting main loop")
831
main_loop_started = True
2117
832
main_loop.run()
2118
except AvahiError as error:
2119
logger.critical("AvahiError: %s", error)
2120
cleanup()
833
except AvahiError, error:
834
logger.critical(u"AvahiError: %s" + unicode(error))
2121
835
sys.exit(1)
2122
836
except KeyboardInterrupt:
2123
837
if debug:
2124
print("", file=sys.stderr)
2125
logger.debug("Server received KeyboardInterrupt")
2126
logger.debug("Server exiting")
2127
# Must run before the D-Bus bus name gets deregistered
2128
cleanup()
838
print
2129
839
2130
840
if __name__ == '__main__':
2131
841
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0