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- Committer: Teddy Hogeborn
- Date: 2011-09-26 19:36:18 UTC
- mfrom: (24.1.184 mandos)
- Revision ID: teddy@fukt.bsnet.se-20110926193618-vtj5c9hena1maixx
Merge from Björn
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- plugins.d/usplash
- files renamed:
- 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 = "1.3.1"
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
74
97
console = logging.StreamHandler()
75
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
98
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
' %(levelname)s:'
76
100
' %(message)s'))
77
101
logger.addHandler(console)
78
102
79
103
class AvahiError(Exception):
80
def __init__(self, value):
104
def __init__(self, value, *args, **kwargs):
81
105
self.value = value
82
def __str__(self):
83
return repr(self.value)
106
super(AvahiError, self).__init__(value, *args, **kwargs)
107
def __unicode__(self):
108
return unicode(repr(self.value))
84
109
85
110
class AvahiServiceError(AvahiError):
86
111
pass
91
116
92
117
class AvahiService(object):
93
118
"""An Avahi (Zeroconf) service.
119
94
120
Attributes:
95
121
interface: integer; avahi.IF_UNSPEC or an interface index.
96
122
Used to optionally bind to the specified interface.
104
130
max_renames: integer; maximum number of renames
105
131
rename_count: integer; counter so we only rename after collisions
106
132
a sensible number of times
133
group: D-Bus Entry Group
134
server: D-Bus Server
135
bus: dbus.SystemBus()
107
136
"""
108
137
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
type = None, port = None, TXT = None, domain = "",
110
host = "", max_renames = 32768):
138
servicetype = None, port = None, TXT = None,
139
domain = "", host = "", max_renames = 32768,
140
protocol = avahi.PROTO_UNSPEC, bus = None):
111
141
self.interface = interface
112
142
self.name = name
113
self.type = type
143
self.type = servicetype
114
144
self.port = port
115
if TXT is None:
116
self.TXT = []
117
else:
118
self.TXT = TXT
145
self.TXT = TXT if TXT is not None else []
119
146
self.domain = domain
120
147
self.host = host
121
148
self.rename_count = 0
122
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
123
155
def rename(self):
124
156
"""Derived from the Avahi example code"""
125
157
if self.rename_count >= self.max_renames:
126
logger.critical(u"No suitable service name found after %i"
127
u" retries, exiting.", rename_count)
158
logger.critical("No suitable Zeroconf service name found"
159
" after %i retries, exiting.",
160
self.rename_count)
128
161
raise AvahiServiceError("Too many renames")
129
self.name = server.GetAlternativeServiceName(self.name)
130
logger.info(u"Changing name to %r ...", str(self.name))
131
syslogger.setFormatter(logging.Formatter\
132
('Mandos (%s): %%(levelname)s:'
133
' %%(message)s' % self.name))
162
self.name = unicode(self.server.GetAlternativeServiceName(self.name))
163
logger.info("Changing Zeroconf service name to %r ...",
164
self.name)
165
syslogger.setFormatter(logging.Formatter
166
('Mandos (%s) [%%(process)d]:'
167
' %%(levelname)s: %%(message)s'
168
% self.name))
134
169
self.remove()
135
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)
136
176
self.rename_count += 1
137
177
def remove(self):
138
178
"""Derived from the Avahi example code"""
139
if group is not None:
140
group.Reset()
179
if self.entry_group_state_changed_match is not None:
180
self.entry_group_state_changed_match.remove()
181
self.entry_group_state_changed_match = None
182
if self.group is not None:
183
self.group.Reset()
141
184
def add(self):
142
185
"""Derived from the Avahi example code"""
143
global group
144
if group is None:
145
group = dbus.Interface\
146
(bus.get_object(avahi.DBUS_NAME,
147
server.EntryGroupNew()),
148
avahi.DBUS_INTERFACE_ENTRY_GROUP)
149
group.connect_to_signal('StateChanged',
150
entry_group_state_changed)
151
logger.debug(u"Adding service '%s' of type '%s' ...",
152
service.name, service.type)
153
group.AddService(
154
self.interface, # interface
155
avahi.PROTO_INET6, # protocol
156
dbus.UInt32(0), # flags
157
self.name, self.type,
158
self.domain, self.host,
159
dbus.UInt16(self.port),
160
avahi.string_array_to_txt_array(self.TXT))
161
group.Commit()
162
163
# From the Avahi example code:
164
group = None # our entry group
165
# End of Avahi example code
166
167
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())
265
266
267
def _timedelta_to_milliseconds(td):
268
"Convert a datetime.timedelta() to milliseconds"
269
return ((td.days * 24 * 60 * 60 * 1000)
270
+ (td.seconds * 1000)
271
+ (td.microseconds // 1000))
272
168
273
class Client(object):
169
274
"""A representation of a client host served by this server.
275
170
276
Attributes:
171
name: string; from the config file, used in log messages
277
_approved: bool(); 'None' if not yet approved/disapproved
278
approval_delay: datetime.timedelta(); Time to wait for approval
279
approval_duration: datetime.timedelta(); Duration of one approval
280
checker: subprocess.Popen(); a running checker process used
281
to see if the client lives.
282
'None' if no process is running.
283
checker_callback_tag: a gobject event source tag, or None
284
checker_command: string; External command which is run to check
285
if client lives. %() expansions are done at
286
runtime with vars(self) as dict, so that for
287
instance %(name)s can be used in the command.
288
checker_initiator_tag: a gobject event source tag, or None
289
created: datetime.datetime(); (UTC) object creation
290
current_checker_command: string; current running checker_command
291
disable_hook: If set, called by disable() as disable_hook(self)
292
disable_initiator_tag: a gobject event source tag, or None
293
enabled: bool()
172
294
fingerprint: string (40 or 32 hexadecimal digits); used to
173
295
uniquely identify the client
174
secret: bytestring; sent verbatim (over TLS) to client
175
host: string; available for use by the checker command
176
created: datetime.datetime(); object creation, not client host
177
last_checked_ok: datetime.datetime() or None if not yet checked OK
178
timeout: datetime.timedelta(); How long from last_checked_ok
179
until this client is invalid
180
interval: datetime.timedelta(); How often to start a new checker
181
stop_hook: If set, called by stop() as stop_hook(self)
182
checker: subprocess.Popen(); a running checker process used
183
to see if the client lives.
184
'None' if no process is running.
185
checker_initiator_tag: a gobject event source tag, or None
186
stop_initiator_tag: - '' -
187
checker_callback_tag: - '' -
188
checker_command: string; External command which is run to check if
189
client lives. %() expansions are done at
190
runtime with vars(self) as dict, so that for
191
instance %(name)s can be used in the command.
192
Private attibutes:
193
_timeout: Real variable for 'timeout'
194
_interval: Real variable for 'interval'
195
_timeout_milliseconds: Used when calling gobject.timeout_add()
196
_interval_milliseconds: - '' -
296
host: string; available for use by the checker command
297
interval: datetime.timedelta(); How often to start a new checker
298
last_approval_request: datetime.datetime(); (UTC) or None
299
last_checked_ok: datetime.datetime(); (UTC) or None
300
last_enabled: datetime.datetime(); (UTC)
301
name: string; from the config file, used in log messages and
302
D-Bus identifiers
303
secret: bytestring; sent verbatim (over TLS) to client
304
timeout: datetime.timedelta(); How long from last_checked_ok
305
until this client is disabled
306
extended_timeout: extra long timeout when password has been sent
307
runtime_expansions: Allowed attributes for runtime expansion.
308
expires: datetime.datetime(); time (UTC) when a client will be
309
disabled, or None
197
310
"""
198
def _set_timeout(self, timeout):
199
"Setter function for 'timeout' attribute"
200
self._timeout = timeout
201
self._timeout_milliseconds = ((self.timeout.days
202
* 24 * 60 * 60 * 1000)
203
+ (self.timeout.seconds * 1000)
204
+ (self.timeout.microseconds
205
// 1000))
206
timeout = property(lambda self: self._timeout,
207
_set_timeout)
208
del _set_timeout
209
def _set_interval(self, interval):
210
"Setter function for 'interval' attribute"
211
self._interval = interval
212
self._interval_milliseconds = ((self.interval.days
213
* 24 * 60 * 60 * 1000)
214
+ (self.interval.seconds
215
* 1000)
216
+ (self.interval.microseconds
217
// 1000))
218
interval = property(lambda self: self._interval,
219
_set_interval)
220
del _set_interval
221
def __init__(self, name = None, stop_hook=None, config={}):
311
312
runtime_expansions = ("approval_delay", "approval_duration",
313
"created", "enabled", "fingerprint",
314
"host", "interval", "last_checked_ok",
315
"last_enabled", "name", "timeout")
316
317
def timeout_milliseconds(self):
318
"Return the 'timeout' attribute in milliseconds"
319
return _timedelta_to_milliseconds(self.timeout)
320
321
def extended_timeout_milliseconds(self):
322
"Return the 'extended_timeout' attribute in milliseconds"
323
return _timedelta_to_milliseconds(self.extended_timeout)
324
325
def interval_milliseconds(self):
326
"Return the 'interval' attribute in milliseconds"
327
return _timedelta_to_milliseconds(self.interval)
328
329
def approval_delay_milliseconds(self):
330
return _timedelta_to_milliseconds(self.approval_delay)
331
332
def __init__(self, name = None, disable_hook=None, config=None):
222
333
"""Note: the 'checker' key in 'config' sets the
223
334
'checker_command' attribute and *not* the 'checker'
224
335
attribute."""
225
336
self.name = name
226
logger.debug(u"Creating client %r", self.name)
337
if config is None:
338
config = {}
339
logger.debug("Creating client %r", self.name)
227
340
# Uppercase and remove spaces from fingerprint for later
228
341
# comparison purposes with return value from the fingerprint()
229
342
# function
230
self.fingerprint = config["fingerprint"].upper()\
231
.replace(u" ", u"")
232
logger.debug(u" Fingerprint: %s", self.fingerprint)
343
self.fingerprint = (config["fingerprint"].upper()
344
.replace(" ", ""))
345
logger.debug(" Fingerprint: %s", self.fingerprint)
233
346
if "secret" in config:
234
self.secret = config["secret"].decode(u"base64")
347
self.secret = config["secret"].decode("base64")
235
348
elif "secfile" in config:
236
sf = open(config["secfile"])
237
self.secret = sf.read()
238
sf.close()
349
with open(os.path.expanduser(os.path.expandvars
350
(config["secfile"])),
351
"rb") as secfile:
352
self.secret = secfile.read()
239
353
else:
240
raise TypeError(u"No secret or secfile for client %s"
354
raise TypeError("No secret or secfile for client %s"
241
355
% self.name)
242
356
self.host = config.get("host", "")
243
self.created = datetime.datetime.now()
357
self.created = datetime.datetime.utcnow()
358
self.enabled = False
359
self.last_approval_request = None
360
self.last_enabled = None
244
361
self.last_checked_ok = None
245
362
self.timeout = string_to_delta(config["timeout"])
363
self.extended_timeout = string_to_delta(config["extended_timeout"])
246
364
self.interval = string_to_delta(config["interval"])
247
self.stop_hook = stop_hook
365
self.disable_hook = disable_hook
248
366
self.checker = None
249
367
self.checker_initiator_tag = None
250
self.stop_initiator_tag = None
368
self.disable_initiator_tag = None
369
self.expires = None
251
370
self.checker_callback_tag = None
252
self.check_command = config["checker"]
253
def start(self):
371
self.checker_command = config["checker"]
372
self.current_checker_command = None
373
self.last_connect = None
374
self._approved = None
375
self.approved_by_default = config.get("approved_by_default",
376
True)
377
self.approvals_pending = 0
378
self.approval_delay = string_to_delta(
379
config["approval_delay"])
380
self.approval_duration = string_to_delta(
381
config["approval_duration"])
382
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
383
384
def send_changedstate(self):
385
self.changedstate.acquire()
386
self.changedstate.notify_all()
387
self.changedstate.release()
388
389
def enable(self):
254
390
"""Start this client's checker and timeout hooks"""
391
if getattr(self, "enabled", False):
392
# Already enabled
393
return
394
self.send_changedstate()
255
395
# Schedule a new checker to be started an 'interval' from now,
256
396
# and every interval from then on.
257
self.checker_initiator_tag = gobject.timeout_add\
258
(self._interval_milliseconds,
259
self.start_checker)
397
self.checker_initiator_tag = (gobject.timeout_add
398
(self.interval_milliseconds(),
399
self.start_checker))
400
# Schedule a disable() when 'timeout' has passed
401
self.expires = datetime.datetime.utcnow() + self.timeout
402
self.disable_initiator_tag = (gobject.timeout_add
403
(self.timeout_milliseconds(),
404
self.disable))
405
self.enabled = True
406
self.last_enabled = datetime.datetime.utcnow()
260
407
# Also start a new checker *right now*.
261
408
self.start_checker()
262
# Schedule a stop() when 'timeout' has passed
263
self.stop_initiator_tag = gobject.timeout_add\
264
(self._timeout_milliseconds,
265
self.stop)
266
def stop(self):
267
"""Stop this client.
268
The possibility that a client might be restarted is left open,
269
but not currently used."""
270
# If this client doesn't have a secret, it is already stopped.
271
if hasattr(self, "secret") and self.secret:
272
logger.info(u"Stopping client %s", self.name)
273
self.secret = None
274
else:
409
410
def disable(self, quiet=True):
411
"""Disable this client."""
412
if not getattr(self, "enabled", False):
275
413
return False
276
if getattr(self, "stop_initiator_tag", False):
277
gobject.source_remove(self.stop_initiator_tag)
278
self.stop_initiator_tag = None
414
if not quiet:
415
self.send_changedstate()
416
if not quiet:
417
logger.info("Disabling client %s", self.name)
418
if getattr(self, "disable_initiator_tag", False):
419
gobject.source_remove(self.disable_initiator_tag)
420
self.disable_initiator_tag = None
421
self.expires = None
279
422
if getattr(self, "checker_initiator_tag", False):
280
423
gobject.source_remove(self.checker_initiator_tag)
281
424
self.checker_initiator_tag = None
282
425
self.stop_checker()
283
if self.stop_hook:
284
self.stop_hook(self)
426
if self.disable_hook:
427
self.disable_hook(self)
428
self.enabled = False
285
429
# Do not run this again if called by a gobject.timeout_add
286
430
return False
431
287
432
def __del__(self):
288
self.stop_hook = None
289
self.stop()
290
def checker_callback(self, pid, condition):
433
self.disable_hook = None
434
self.disable()
435
436
def checker_callback(self, pid, condition, command):
291
437
"""The checker has completed, so take appropriate actions."""
292
now = datetime.datetime.now()
293
438
self.checker_callback_tag = None
294
439
self.checker = None
295
if os.WIFEXITED(condition) \
296
and (os.WEXITSTATUS(condition) == 0):
297
logger.info(u"Checker for %(name)s succeeded",
298
vars(self))
299
self.last_checked_ok = now
300
gobject.source_remove(self.stop_initiator_tag)
301
self.stop_initiator_tag = gobject.timeout_add\
302
(self._timeout_milliseconds,
303
self.stop)
304
elif not os.WIFEXITED(condition):
305
logger.warning(u"Checker for %(name)s crashed?",
440
if os.WIFEXITED(condition):
441
exitstatus = os.WEXITSTATUS(condition)
442
if exitstatus == 0:
443
logger.info("Checker for %(name)s succeeded",
444
vars(self))
445
self.checked_ok()
446
else:
447
logger.info("Checker for %(name)s failed",
448
vars(self))
449
else:
450
logger.warning("Checker for %(name)s crashed?",
306
451
vars(self))
307
else:
308
logger.info(u"Checker for %(name)s failed",
309
vars(self))
452
453
def checked_ok(self, timeout=None):
454
"""Bump up the timeout for this client.
455
456
This should only be called when the client has been seen,
457
alive and well.
458
"""
459
if timeout is None:
460
timeout = self.timeout
461
self.last_checked_ok = datetime.datetime.utcnow()
462
gobject.source_remove(self.disable_initiator_tag)
463
self.expires = datetime.datetime.utcnow() + timeout
464
self.disable_initiator_tag = (gobject.timeout_add
465
(_timedelta_to_milliseconds(timeout),
466
self.disable))
467
468
def need_approval(self):
469
self.last_approval_request = datetime.datetime.utcnow()
470
310
471
def start_checker(self):
311
472
"""Start a new checker subprocess if one is not running.
473
312
474
If a checker already exists, leave it running and do
313
475
nothing."""
314
476
# The reason for not killing a running checker is that if we
317
479
# client would inevitably timeout, since no checker would get
318
480
# a chance to run to completion. If we instead leave running
319
481
# checkers alone, the checker would have to take more time
320
# than 'timeout' for the client to be declared invalid, which
321
# is as it should be.
482
# than 'timeout' for the client to be disabled, which is as it
483
# should be.
484
485
# If a checker exists, make sure it is not a zombie
486
try:
487
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
488
except (AttributeError, OSError) as error:
489
if (isinstance(error, OSError)
490
and error.errno != errno.ECHILD):
491
raise error
492
else:
493
if pid:
494
logger.warning("Checker was a zombie")
495
gobject.source_remove(self.checker_callback_tag)
496
self.checker_callback(pid, status,
497
self.current_checker_command)
498
# Start a new checker if needed
322
499
if self.checker is None:
323
500
try:
324
# In case check_command has exactly one % operator
325
command = self.check_command % self.host
501
# In case checker_command has exactly one % operator
502
command = self.checker_command % self.host
326
503
except TypeError:
327
504
# Escape attributes for the shell
328
escaped_attrs = dict((key, re.escape(str(val)))
329
for key, val in
330
vars(self).iteritems())
505
escaped_attrs = dict(
506
(attr,
507
re.escape(unicode(str(getattr(self, attr, "")),
508
errors=
509
'replace')))
510
for attr in
511
self.runtime_expansions)
512
331
513
try:
332
command = self.check_command % escaped_attrs
333
except TypeError, error:
334
logger.error(u'Could not format string "%s":'
335
u' %s', self.check_command, error)
514
command = self.checker_command % escaped_attrs
515
except TypeError as error:
516
logger.error('Could not format string "%s":'
517
' %s', self.checker_command, error)
336
518
return True # Try again later
519
self.current_checker_command = command
337
520
try:
338
logger.info(u"Starting checker %r for %s",
521
logger.info("Starting checker %r for %s",
339
522
command, self.name)
523
# We don't need to redirect stdout and stderr, since
524
# in normal mode, that is already done by daemon(),
525
# and in debug mode we don't want to. (Stdin is
526
# always replaced by /dev/null.)
340
527
self.checker = subprocess.Popen(command,
341
528
close_fds=True,
342
529
shell=True, cwd="/")
343
self.checker_callback_tag = gobject.child_watch_add\
344
(self.checker.pid,
345
self.checker_callback)
346
except subprocess.OSError, error:
347
logger.error(u"Failed to start subprocess: %s",
530
self.checker_callback_tag = (gobject.child_watch_add
531
(self.checker.pid,
532
self.checker_callback,
533
data=command))
534
# The checker may have completed before the gobject
535
# watch was added. Check for this.
536
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
537
if pid:
538
gobject.source_remove(self.checker_callback_tag)
539
self.checker_callback(pid, status, command)
540
except OSError as error:
541
logger.error("Failed to start subprocess: %s",
348
542
error)
349
543
# Re-run this periodically if run by gobject.timeout_add
350
544
return True
545
351
546
def stop_checker(self):
352
547
"""Force the checker process, if any, to stop."""
353
548
if self.checker_callback_tag:
355
550
self.checker_callback_tag = None
356
551
if getattr(self, "checker", None) is None:
357
552
return
358
logger.debug(u"Stopping checker for %(name)s", vars(self))
553
logger.debug("Stopping checker for %(name)s", vars(self))
359
554
try:
360
555
os.kill(self.checker.pid, signal.SIGTERM)
361
#os.sleep(0.5)
556
#time.sleep(0.5)
362
557
#if self.checker.poll() is None:
363
558
# os.kill(self.checker.pid, signal.SIGKILL)
364
except OSError, error:
559
except OSError as error:
365
560
if error.errno != errno.ESRCH: # No such process
366
561
raise
367
562
self.checker = None
368
def still_valid(self):
369
"""Has the timeout not yet passed for this client?"""
370
now = datetime.datetime.now()
371
if self.last_checked_ok is None:
372
return now < (self.created + self.timeout)
373
else:
374
return now < (self.last_checked_ok + self.timeout)
375
376
377
def peer_certificate(session):
378
"Return the peer's OpenPGP certificate as a bytestring"
379
# If not an OpenPGP certificate...
380
if gnutls.library.functions.gnutls_certificate_type_get\
381
(session._c_object) \
382
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
383
# ...do the normal thing
384
return session.peer_certificate
385
list_size = ctypes.c_uint()
386
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
387
(session._c_object, ctypes.byref(list_size))
388
if list_size.value == 0:
389
return None
390
cert = cert_list[0]
391
return ctypes.string_at(cert.data, cert.size)
392
393
394
def fingerprint(openpgp):
395
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
396
# New GnuTLS "datum" with the OpenPGP public key
397
datum = gnutls.library.types.gnutls_datum_t\
398
(ctypes.cast(ctypes.c_char_p(openpgp),
399
ctypes.POINTER(ctypes.c_ubyte)),
400
ctypes.c_uint(len(openpgp)))
401
# New empty GnuTLS certificate
402
crt = gnutls.library.types.gnutls_openpgp_crt_t()
403
gnutls.library.functions.gnutls_openpgp_crt_init\
404
(ctypes.byref(crt))
405
# Import the OpenPGP public key into the certificate
406
gnutls.library.functions.gnutls_openpgp_crt_import\
407
(crt, ctypes.byref(datum),
408
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
409
# New buffer for the fingerprint
410
buffer = ctypes.create_string_buffer(20)
411
buffer_length = ctypes.c_size_t()
412
# Get the fingerprint from the certificate into the buffer
413
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
414
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
415
# Deinit the certificate
416
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
417
# Convert the buffer to a Python bytestring
418
fpr = ctypes.string_at(buffer, buffer_length.value)
419
# Convert the bytestring to hexadecimal notation
420
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
421
return hex_fpr
422
423
424
class tcp_handler(SocketServer.BaseRequestHandler, object):
425
"""A TCP request handler class.
426
Instantiated by IPv6_TCPServer for each request to handle it.
563
564
def dbus_service_property(dbus_interface, signature="v",
565
access="readwrite", byte_arrays=False):
566
"""Decorators for marking methods of a DBusObjectWithProperties to
567
become properties on the D-Bus.
568
569
The decorated method will be called with no arguments by "Get"
570
and with one argument by "Set".
571
572
The parameters, where they are supported, are the same as
573
dbus.service.method, except there is only "signature", since the
574
type from Get() and the type sent to Set() is the same.
575
"""
576
# Encoding deeply encoded byte arrays is not supported yet by the
577
# "Set" method, so we fail early here:
578
if byte_arrays and signature != "ay":
579
raise ValueError("Byte arrays not supported for non-'ay'"
580
" signature %r" % signature)
581
def decorator(func):
582
func._dbus_is_property = True
583
func._dbus_interface = dbus_interface
584
func._dbus_signature = signature
585
func._dbus_access = access
586
func._dbus_name = func.__name__
587
if func._dbus_name.endswith("_dbus_property"):
588
func._dbus_name = func._dbus_name[:-14]
589
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
590
return func
591
return decorator
592
593
594
class DBusPropertyException(dbus.exceptions.DBusException):
595
"""A base class for D-Bus property-related exceptions
596
"""
597
def __unicode__(self):
598
return unicode(str(self))
599
600
601
class DBusPropertyAccessException(DBusPropertyException):
602
"""A property's access permissions disallows an operation.
603
"""
604
pass
605
606
607
class DBusPropertyNotFound(DBusPropertyException):
608
"""An attempt was made to access a non-existing property.
609
"""
610
pass
611
612
613
class DBusObjectWithProperties(dbus.service.Object):
614
"""A D-Bus object with properties.
615
616
Classes inheriting from this can use the dbus_service_property
617
decorator to expose methods as D-Bus properties. It exposes the
618
standard Get(), Set(), and GetAll() methods on the D-Bus.
619
"""
620
621
@staticmethod
622
def _is_dbus_property(obj):
623
return getattr(obj, "_dbus_is_property", False)
624
625
def _get_all_dbus_properties(self):
626
"""Returns a generator of (name, attribute) pairs
627
"""
628
return ((prop._dbus_name, prop)
629
for name, prop in
630
inspect.getmembers(self, self._is_dbus_property))
631
632
def _get_dbus_property(self, interface_name, property_name):
633
"""Returns a bound method if one exists which is a D-Bus
634
property with the specified name and interface.
635
"""
636
for name in (property_name,
637
property_name + "_dbus_property"):
638
prop = getattr(self, name, None)
639
if (prop is None
640
or not self._is_dbus_property(prop)
641
or prop._dbus_name != property_name
642
or (interface_name and prop._dbus_interface
643
and interface_name != prop._dbus_interface)):
644
continue
645
return prop
646
# No such property
647
raise DBusPropertyNotFound(self.dbus_object_path + ":"
648
+ interface_name + "."
649
+ property_name)
650
651
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
652
out_signature="v")
653
def Get(self, interface_name, property_name):
654
"""Standard D-Bus property Get() method, see D-Bus standard.
655
"""
656
prop = self._get_dbus_property(interface_name, property_name)
657
if prop._dbus_access == "write":
658
raise DBusPropertyAccessException(property_name)
659
value = prop()
660
if not hasattr(value, "variant_level"):
661
return value
662
return type(value)(value, variant_level=value.variant_level+1)
663
664
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
665
def Set(self, interface_name, property_name, value):
666
"""Standard D-Bus property Set() method, see D-Bus standard.
667
"""
668
prop = self._get_dbus_property(interface_name, property_name)
669
if prop._dbus_access == "read":
670
raise DBusPropertyAccessException(property_name)
671
if prop._dbus_get_args_options["byte_arrays"]:
672
# The byte_arrays option is not supported yet on
673
# signatures other than "ay".
674
if prop._dbus_signature != "ay":
675
raise ValueError
676
value = dbus.ByteArray(''.join(unichr(byte)
677
for byte in value))
678
prop(value)
679
680
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
681
out_signature="a{sv}")
682
def GetAll(self, interface_name):
683
"""Standard D-Bus property GetAll() method, see D-Bus
684
standard.
685
686
Note: Will not include properties with access="write".
687
"""
688
all = {}
689
for name, prop in self._get_all_dbus_properties():
690
if (interface_name
691
and interface_name != prop._dbus_interface):
692
# Interface non-empty but did not match
693
continue
694
# Ignore write-only properties
695
if prop._dbus_access == "write":
696
continue
697
value = prop()
698
if not hasattr(value, "variant_level"):
699
all[name] = value
700
continue
701
all[name] = type(value)(value, variant_level=
702
value.variant_level+1)
703
return dbus.Dictionary(all, signature="sv")
704
705
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
706
out_signature="s",
707
path_keyword='object_path',
708
connection_keyword='connection')
709
def Introspect(self, object_path, connection):
710
"""Standard D-Bus method, overloaded to insert property tags.
711
"""
712
xmlstring = dbus.service.Object.Introspect(self, object_path,
713
connection)
714
try:
715
document = xml.dom.minidom.parseString(xmlstring)
716
def make_tag(document, name, prop):
717
e = document.createElement("property")
718
e.setAttribute("name", name)
719
e.setAttribute("type", prop._dbus_signature)
720
e.setAttribute("access", prop._dbus_access)
721
return e
722
for if_tag in document.getElementsByTagName("interface"):
723
for tag in (make_tag(document, name, prop)
724
for name, prop
725
in self._get_all_dbus_properties()
726
if prop._dbus_interface
727
== if_tag.getAttribute("name")):
728
if_tag.appendChild(tag)
729
# Add the names to the return values for the
730
# "org.freedesktop.DBus.Properties" methods
731
if (if_tag.getAttribute("name")
732
== "org.freedesktop.DBus.Properties"):
733
for cn in if_tag.getElementsByTagName("method"):
734
if cn.getAttribute("name") == "Get":
735
for arg in cn.getElementsByTagName("arg"):
736
if (arg.getAttribute("direction")
737
== "out"):
738
arg.setAttribute("name", "value")
739
elif cn.getAttribute("name") == "GetAll":
740
for arg in cn.getElementsByTagName("arg"):
741
if (arg.getAttribute("direction")
742
== "out"):
743
arg.setAttribute("name", "props")
744
xmlstring = document.toxml("utf-8")
745
document.unlink()
746
except (AttributeError, xml.dom.DOMException,
747
xml.parsers.expat.ExpatError) as error:
748
logger.error("Failed to override Introspection method",
749
error)
750
return xmlstring
751
752
753
def datetime_to_dbus (dt, variant_level=0):
754
"""Convert a UTC datetime.datetime() to a D-Bus type."""
755
if dt is None:
756
return dbus.String("", variant_level = variant_level)
757
return dbus.String(dt.isoformat(),
758
variant_level=variant_level)
759
760
class ClientDBus(Client, DBusObjectWithProperties):
761
"""A Client class using D-Bus
762
763
Attributes:
764
dbus_object_path: dbus.ObjectPath
765
bus: dbus.SystemBus()
766
"""
767
768
runtime_expansions = (Client.runtime_expansions
769
+ ("dbus_object_path",))
770
771
# dbus.service.Object doesn't use super(), so we can't either.
772
773
def __init__(self, bus = None, *args, **kwargs):
774
self._approvals_pending = 0
775
self.bus = bus
776
Client.__init__(self, *args, **kwargs)
777
# Only now, when this client is initialized, can it show up on
778
# the D-Bus
779
client_object_name = unicode(self.name).translate(
780
{ord("."): ord("_"),
781
ord("-"): ord("_")})
782
self.dbus_object_path = (dbus.ObjectPath
783
("/clients/" + client_object_name))
784
DBusObjectWithProperties.__init__(self, self.bus,
785
self.dbus_object_path)
786
787
def notifychangeproperty(transform_func,
788
dbus_name, type_func=lambda x: x,
789
variant_level=1):
790
""" Modify a variable so that its a property that announce its
791
changes to DBus.
792
transform_fun: Function that takes a value and transform it to
793
DBus type.
794
dbus_name: DBus name of the variable
795
type_func: Function that transform the value before sending it
796
to DBus
797
variant_level: DBus variant level. default: 1
798
"""
799
real_value = [None,]
800
def setter(self, value):
801
old_value = real_value[0]
802
real_value[0] = value
803
if hasattr(self, "dbus_object_path"):
804
if type_func(old_value) != type_func(real_value[0]):
805
dbus_value = transform_func(type_func(real_value[0]),
806
variant_level)
807
self.PropertyChanged(dbus.String(dbus_name),
808
dbus_value)
809
810
return property(lambda self: real_value[0], setter)
811
812
813
expires = notifychangeproperty(datetime_to_dbus, "Expires")
814
approvals_pending = notifychangeproperty(dbus.Boolean,
815
"ApprovalPending",
816
type_func = bool)
817
enabled = notifychangeproperty(dbus.Boolean, "Enabled")
818
last_enabled = notifychangeproperty(datetime_to_dbus,
819
"LastEnabled")
820
checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
821
type_func = lambda checker: checker is not None)
822
last_checked_ok = notifychangeproperty(datetime_to_dbus,
823
"LastCheckedOK")
824
last_approval_request = notifychangeproperty(datetime_to_dbus,
825
"LastApprovalRequest")
826
approved_by_default = notifychangeproperty(dbus.Boolean,
827
"ApprovedByDefault")
828
approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",
829
type_func = _timedelta_to_milliseconds)
830
approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",
831
type_func = _timedelta_to_milliseconds)
832
host = notifychangeproperty(dbus.String, "Host")
833
timeout = notifychangeproperty(dbus.UInt16, "Timeout",
834
type_func = _timedelta_to_milliseconds)
835
extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",
836
type_func = _timedelta_to_milliseconds)
837
interval = notifychangeproperty(dbus.UInt16, "Interval",
838
type_func = _timedelta_to_milliseconds)
839
checker_command = notifychangeproperty(dbus.String, "Checker")
840
841
del notifychangeproperty
842
843
def __del__(self, *args, **kwargs):
844
try:
845
self.remove_from_connection()
846
except LookupError:
847
pass
848
if hasattr(DBusObjectWithProperties, "__del__"):
849
DBusObjectWithProperties.__del__(self, *args, **kwargs)
850
Client.__del__(self, *args, **kwargs)
851
852
def checker_callback(self, pid, condition, command,
853
*args, **kwargs):
854
self.checker_callback_tag = None
855
self.checker = None
856
if os.WIFEXITED(condition):
857
exitstatus = os.WEXITSTATUS(condition)
858
# Emit D-Bus signal
859
self.CheckerCompleted(dbus.Int16(exitstatus),
860
dbus.Int64(condition),
861
dbus.String(command))
862
else:
863
# Emit D-Bus signal
864
self.CheckerCompleted(dbus.Int16(-1),
865
dbus.Int64(condition),
866
dbus.String(command))
867
868
return Client.checker_callback(self, pid, condition, command,
869
*args, **kwargs)
870
871
def start_checker(self, *args, **kwargs):
872
old_checker = self.checker
873
if self.checker is not None:
874
old_checker_pid = self.checker.pid
875
else:
876
old_checker_pid = None
877
r = Client.start_checker(self, *args, **kwargs)
878
# Only if new checker process was started
879
if (self.checker is not None
880
and old_checker_pid != self.checker.pid):
881
# Emit D-Bus signal
882
self.CheckerStarted(self.current_checker_command)
883
return r
884
885
def _reset_approved(self):
886
self._approved = None
887
return False
888
889
def approve(self, value=True):
890
self.send_changedstate()
891
self._approved = value
892
gobject.timeout_add(_timedelta_to_milliseconds
893
(self.approval_duration),
894
self._reset_approved)
895
896
897
## D-Bus methods, signals & properties
898
_interface = "se.bsnet.fukt.Mandos.Client"
899
900
## Signals
901
902
# CheckerCompleted - signal
903
@dbus.service.signal(_interface, signature="nxs")
904
def CheckerCompleted(self, exitcode, waitstatus, command):
905
"D-Bus signal"
906
pass
907
908
# CheckerStarted - signal
909
@dbus.service.signal(_interface, signature="s")
910
def CheckerStarted(self, command):
911
"D-Bus signal"
912
pass
913
914
# PropertyChanged - signal
915
@dbus.service.signal(_interface, signature="sv")
916
def PropertyChanged(self, property, value):
917
"D-Bus signal"
918
pass
919
920
# GotSecret - signal
921
@dbus.service.signal(_interface)
922
def GotSecret(self):
923
"""D-Bus signal
924
Is sent after a successful transfer of secret from the Mandos
925
server to mandos-client
926
"""
927
pass
928
929
# Rejected - signal
930
@dbus.service.signal(_interface, signature="s")
931
def Rejected(self, reason):
932
"D-Bus signal"
933
pass
934
935
# NeedApproval - signal
936
@dbus.service.signal(_interface, signature="tb")
937
def NeedApproval(self, timeout, default):
938
"D-Bus signal"
939
return self.need_approval()
940
941
## Methods
942
943
# Approve - method
944
@dbus.service.method(_interface, in_signature="b")
945
def Approve(self, value):
946
self.approve(value)
947
948
# CheckedOK - method
949
@dbus.service.method(_interface)
950
def CheckedOK(self):
951
self.checked_ok()
952
953
# Enable - method
954
@dbus.service.method(_interface)
955
def Enable(self):
956
"D-Bus method"
957
self.enable()
958
959
# StartChecker - method
960
@dbus.service.method(_interface)
961
def StartChecker(self):
962
"D-Bus method"
963
self.start_checker()
964
965
# Disable - method
966
@dbus.service.method(_interface)
967
def Disable(self):
968
"D-Bus method"
969
self.disable()
970
971
# StopChecker - method
972
@dbus.service.method(_interface)
973
def StopChecker(self):
974
self.stop_checker()
975
976
## Properties
977
978
# ApprovalPending - property
979
@dbus_service_property(_interface, signature="b", access="read")
980
def ApprovalPending_dbus_property(self):
981
return dbus.Boolean(bool(self.approvals_pending))
982
983
# ApprovedByDefault - property
984
@dbus_service_property(_interface, signature="b",
985
access="readwrite")
986
def ApprovedByDefault_dbus_property(self, value=None):
987
if value is None: # get
988
return dbus.Boolean(self.approved_by_default)
989
self.approved_by_default = bool(value)
990
991
# ApprovalDelay - property
992
@dbus_service_property(_interface, signature="t",
993
access="readwrite")
994
def ApprovalDelay_dbus_property(self, value=None):
995
if value is None: # get
996
return dbus.UInt64(self.approval_delay_milliseconds())
997
self.approval_delay = datetime.timedelta(0, 0, 0, value)
998
999
# ApprovalDuration - property
1000
@dbus_service_property(_interface, signature="t",
1001
access="readwrite")
1002
def ApprovalDuration_dbus_property(self, value=None):
1003
if value is None: # get
1004
return dbus.UInt64(_timedelta_to_milliseconds(
1005
self.approval_duration))
1006
self.approval_duration = datetime.timedelta(0, 0, 0, value)
1007
1008
# Name - property
1009
@dbus_service_property(_interface, signature="s", access="read")
1010
def Name_dbus_property(self):
1011
return dbus.String(self.name)
1012
1013
# Fingerprint - property
1014
@dbus_service_property(_interface, signature="s", access="read")
1015
def Fingerprint_dbus_property(self):
1016
return dbus.String(self.fingerprint)
1017
1018
# Host - property
1019
@dbus_service_property(_interface, signature="s",
1020
access="readwrite")
1021
def Host_dbus_property(self, value=None):
1022
if value is None: # get
1023
return dbus.String(self.host)
1024
self.host = value
1025
1026
# Created - property
1027
@dbus_service_property(_interface, signature="s", access="read")
1028
def Created_dbus_property(self):
1029
return dbus.String(datetime_to_dbus(self.created))
1030
1031
# LastEnabled - property
1032
@dbus_service_property(_interface, signature="s", access="read")
1033
def LastEnabled_dbus_property(self):
1034
return datetime_to_dbus(self.last_enabled)
1035
1036
# Enabled - property
1037
@dbus_service_property(_interface, signature="b",
1038
access="readwrite")
1039
def Enabled_dbus_property(self, value=None):
1040
if value is None: # get
1041
return dbus.Boolean(self.enabled)
1042
if value:
1043
self.enable()
1044
else:
1045
self.disable()
1046
1047
# LastCheckedOK - property
1048
@dbus_service_property(_interface, signature="s",
1049
access="readwrite")
1050
def LastCheckedOK_dbus_property(self, value=None):
1051
if value is not None:
1052
self.checked_ok()
1053
return
1054
return datetime_to_dbus(self.last_checked_ok)
1055
1056
# Expires - property
1057
@dbus_service_property(_interface, signature="s", access="read")
1058
def Expires_dbus_property(self):
1059
return datetime_to_dbus(self.expires)
1060
1061
# LastApprovalRequest - property
1062
@dbus_service_property(_interface, signature="s", access="read")
1063
def LastApprovalRequest_dbus_property(self):
1064
return datetime_to_dbus(self.last_approval_request)
1065
1066
# Timeout - property
1067
@dbus_service_property(_interface, signature="t",
1068
access="readwrite")
1069
def Timeout_dbus_property(self, value=None):
1070
if value is None: # get
1071
return dbus.UInt64(self.timeout_milliseconds())
1072
self.timeout = datetime.timedelta(0, 0, 0, value)
1073
if getattr(self, "disable_initiator_tag", None) is None:
1074
return
1075
# Reschedule timeout
1076
gobject.source_remove(self.disable_initiator_tag)
1077
self.disable_initiator_tag = None
1078
self.expires = None
1079
time_to_die = (self.
1080
_timedelta_to_milliseconds((self
1081
.last_checked_ok
1082
+ self.timeout)
1083
- datetime.datetime
1084
.utcnow()))
1085
if time_to_die <= 0:
1086
# The timeout has passed
1087
self.disable()
1088
else:
1089
self.expires = (datetime.datetime.utcnow()
1090
+ datetime.timedelta(milliseconds = time_to_die))
1091
self.disable_initiator_tag = (gobject.timeout_add
1092
(time_to_die, self.disable))
1093
1094
# ExtendedTimeout - property
1095
@dbus_service_property(_interface, signature="t",
1096
access="readwrite")
1097
def ExtendedTimeout_dbus_property(self, value=None):
1098
if value is None: # get
1099
return dbus.UInt64(self.extended_timeout_milliseconds())
1100
self.extended_timeout = datetime.timedelta(0, 0, 0, value)
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
if getattr(self, "checker_initiator_tag", None) is None:
1110
return
1111
# Reschedule checker run
1112
gobject.source_remove(self.checker_initiator_tag)
1113
self.checker_initiator_tag = (gobject.timeout_add
1114
(value, self.start_checker))
1115
self.start_checker() # Start one now, too
1116
1117
# Checker - property
1118
@dbus_service_property(_interface, signature="s",
1119
access="readwrite")
1120
def Checker_dbus_property(self, value=None):
1121
if value is None: # get
1122
return dbus.String(self.checker_command)
1123
self.checker_command = value
1124
1125
# CheckerRunning - property
1126
@dbus_service_property(_interface, signature="b",
1127
access="readwrite")
1128
def CheckerRunning_dbus_property(self, value=None):
1129
if value is None: # get
1130
return dbus.Boolean(self.checker is not None)
1131
if value:
1132
self.start_checker()
1133
else:
1134
self.stop_checker()
1135
1136
# ObjectPath - property
1137
@dbus_service_property(_interface, signature="o", access="read")
1138
def ObjectPath_dbus_property(self):
1139
return self.dbus_object_path # is already a dbus.ObjectPath
1140
1141
# Secret = property
1142
@dbus_service_property(_interface, signature="ay",
1143
access="write", byte_arrays=True)
1144
def Secret_dbus_property(self, value):
1145
self.secret = str(value)
1146
1147
del _interface
1148
1149
1150
class ProxyClient(object):
1151
def __init__(self, child_pipe, fpr, address):
1152
self._pipe = child_pipe
1153
self._pipe.send(('init', fpr, address))
1154
if not self._pipe.recv():
1155
raise KeyError()
1156
1157
def __getattribute__(self, name):
1158
if(name == '_pipe'):
1159
return super(ProxyClient, self).__getattribute__(name)
1160
self._pipe.send(('getattr', name))
1161
data = self._pipe.recv()
1162
if data[0] == 'data':
1163
return data[1]
1164
if data[0] == 'function':
1165
def func(*args, **kwargs):
1166
self._pipe.send(('funcall', name, args, kwargs))
1167
return self._pipe.recv()[1]
1168
return func
1169
1170
def __setattr__(self, name, value):
1171
if(name == '_pipe'):
1172
return super(ProxyClient, self).__setattr__(name, value)
1173
self._pipe.send(('setattr', name, value))
1174
1175
1176
class ClientHandler(socketserver.BaseRequestHandler, object):
1177
"""A class to handle client connections.
1178
1179
Instantiated once for each connection to handle it.
427
1180
Note: This will run in its own forked process."""
428
1181
429
1182
def handle(self):
430
logger.info(u"TCP connection from: %s",
431
unicode(self.client_address))
432
session = gnutls.connection.ClientSession\
433
(self.request, gnutls.connection.X509Credentials())
434
435
line = self.request.makefile().readline()
436
logger.debug(u"Protocol version: %r", line)
437
try:
438
if int(line.strip().split()[0]) > 1:
439
raise RuntimeError
440
except (ValueError, IndexError, RuntimeError), error:
441
logger.error(u"Unknown protocol version: %s", error)
442
return
443
444
# Note: gnutls.connection.X509Credentials is really a generic
445
# GnuTLS certificate credentials object so long as no X.509
446
# keys are added to it. Therefore, we can use it here despite
447
# using OpenPGP certificates.
448
449
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
450
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
451
# "+DHE-DSS"))
452
priority = "NORMAL" # Fallback default, since this
453
# MUST be set.
454
if self.server.settings["priority"]:
455
priority = self.server.settings["priority"]
456
gnutls.library.functions.gnutls_priority_set_direct\
457
(session._c_object, priority, None);
458
459
try:
460
session.handshake()
461
except gnutls.errors.GNUTLSError, error:
462
logger.warning(u"Handshake failed: %s", error)
463
# Do not run session.bye() here: the session is not
464
# established. Just abandon the request.
465
return
466
try:
467
fpr = fingerprint(peer_certificate(session))
468
except (TypeError, gnutls.errors.GNUTLSError), error:
469
logger.warning(u"Bad certificate: %s", error)
470
session.bye()
471
return
472
logger.debug(u"Fingerprint: %s", fpr)
473
client = None
474
for c in self.server.clients:
475
if c.fingerprint == fpr:
476
client = c
477
break
478
if not client:
479
logger.warning(u"Client not found for fingerprint: %s",
480
fpr)
481
session.bye()
482
return
483
# Have to check if client.still_valid(), since it is possible
484
# that the client timed out while establishing the GnuTLS
485
# session.
486
if not client.still_valid():
487
logger.warning(u"Client %(name)s is invalid",
488
vars(client))
489
session.bye()
490
return
491
sent_size = 0
492
while sent_size < len(client.secret):
493
sent = session.send(client.secret[sent_size:])
494
logger.debug(u"Sent: %d, remaining: %d",
495
sent, len(client.secret)
496
- (sent_size + sent))
497
sent_size += sent
498
session.bye()
499
500
501
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
502
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1183
with contextlib.closing(self.server.child_pipe) as child_pipe:
1184
logger.info("TCP connection from: %s",
1185
unicode(self.client_address))
1186
logger.debug("Pipe FD: %d",
1187
self.server.child_pipe.fileno())
1188
1189
session = (gnutls.connection
1190
.ClientSession(self.request,
1191
gnutls.connection
1192
.X509Credentials()))
1193
1194
# Note: gnutls.connection.X509Credentials is really a
1195
# generic GnuTLS certificate credentials object so long as
1196
# no X.509 keys are added to it. Therefore, we can use it
1197
# here despite using OpenPGP certificates.
1198
1199
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
1200
# "+AES-256-CBC", "+SHA1",
1201
# "+COMP-NULL", "+CTYPE-OPENPGP",
1202
# "+DHE-DSS"))
1203
# Use a fallback default, since this MUST be set.
1204
priority = self.server.gnutls_priority
1205
if priority is None:
1206
priority = "NORMAL"
1207
(gnutls.library.functions
1208
.gnutls_priority_set_direct(session._c_object,
1209
priority, None))
1210
1211
# Start communication using the Mandos protocol
1212
# Get protocol number
1213
line = self.request.makefile().readline()
1214
logger.debug("Protocol version: %r", line)
1215
try:
1216
if int(line.strip().split()[0]) > 1:
1217
raise RuntimeError
1218
except (ValueError, IndexError, RuntimeError) as error:
1219
logger.error("Unknown protocol version: %s", error)
1220
return
1221
1222
# Start GnuTLS connection
1223
try:
1224
session.handshake()
1225
except gnutls.errors.GNUTLSError as error:
1226
logger.warning("Handshake failed: %s", error)
1227
# Do not run session.bye() here: the session is not
1228
# established. Just abandon the request.
1229
return
1230
logger.debug("Handshake succeeded")
1231
1232
approval_required = False
1233
try:
1234
try:
1235
fpr = self.fingerprint(self.peer_certificate
1236
(session))
1237
except (TypeError,
1238
gnutls.errors.GNUTLSError) as error:
1239
logger.warning("Bad certificate: %s", error)
1240
return
1241
logger.debug("Fingerprint: %s", fpr)
1242
1243
try:
1244
client = ProxyClient(child_pipe, fpr,
1245
self.client_address)
1246
except KeyError:
1247
return
1248
1249
if client.approval_delay:
1250
delay = client.approval_delay
1251
client.approvals_pending += 1
1252
approval_required = True
1253
1254
while True:
1255
if not client.enabled:
1256
logger.info("Client %s is disabled",
1257
client.name)
1258
if self.server.use_dbus:
1259
# Emit D-Bus signal
1260
client.Rejected("Disabled")
1261
return
1262
1263
if client._approved or not client.approval_delay:
1264
#We are approved or approval is disabled
1265
break
1266
elif client._approved is None:
1267
logger.info("Client %s needs approval",
1268
client.name)
1269
if self.server.use_dbus:
1270
# Emit D-Bus signal
1271
client.NeedApproval(
1272
client.approval_delay_milliseconds(),
1273
client.approved_by_default)
1274
else:
1275
logger.warning("Client %s was not approved",
1276
client.name)
1277
if self.server.use_dbus:
1278
# Emit D-Bus signal
1279
client.Rejected("Denied")
1280
return
1281
1282
#wait until timeout or approved
1283
#x = float(client._timedelta_to_milliseconds(delay))
1284
time = datetime.datetime.now()
1285
client.changedstate.acquire()
1286
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1287
client.changedstate.release()
1288
time2 = datetime.datetime.now()
1289
if (time2 - time) >= delay:
1290
if not client.approved_by_default:
1291
logger.warning("Client %s timed out while"
1292
" waiting for approval",
1293
client.name)
1294
if self.server.use_dbus:
1295
# Emit D-Bus signal
1296
client.Rejected("Approval timed out")
1297
return
1298
else:
1299
break
1300
else:
1301
delay -= time2 - time
1302
1303
sent_size = 0
1304
while sent_size < len(client.secret):
1305
try:
1306
sent = session.send(client.secret[sent_size:])
1307
except gnutls.errors.GNUTLSError as error:
1308
logger.warning("gnutls send failed")
1309
return
1310
logger.debug("Sent: %d, remaining: %d",
1311
sent, len(client.secret)
1312
- (sent_size + sent))
1313
sent_size += sent
1314
1315
logger.info("Sending secret to %s", client.name)
1316
# bump the timeout as if seen
1317
client.checked_ok(client.extended_timeout)
1318
if self.server.use_dbus:
1319
# Emit D-Bus signal
1320
client.GotSecret()
1321
1322
finally:
1323
if approval_required:
1324
client.approvals_pending -= 1
1325
try:
1326
session.bye()
1327
except gnutls.errors.GNUTLSError as error:
1328
logger.warning("GnuTLS bye failed")
1329
1330
@staticmethod
1331
def peer_certificate(session):
1332
"Return the peer's OpenPGP certificate as a bytestring"
1333
# If not an OpenPGP certificate...
1334
if (gnutls.library.functions
1335
.gnutls_certificate_type_get(session._c_object)
1336
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1337
# ...do the normal thing
1338
return session.peer_certificate
1339
list_size = ctypes.c_uint(1)
1340
cert_list = (gnutls.library.functions
1341
.gnutls_certificate_get_peers
1342
(session._c_object, ctypes.byref(list_size)))
1343
if not bool(cert_list) and list_size.value != 0:
1344
raise gnutls.errors.GNUTLSError("error getting peer"
1345
" certificate")
1346
if list_size.value == 0:
1347
return None
1348
cert = cert_list[0]
1349
return ctypes.string_at(cert.data, cert.size)
1350
1351
@staticmethod
1352
def fingerprint(openpgp):
1353
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1354
# New GnuTLS "datum" with the OpenPGP public key
1355
datum = (gnutls.library.types
1356
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1357
ctypes.POINTER
1358
(ctypes.c_ubyte)),
1359
ctypes.c_uint(len(openpgp))))
1360
# New empty GnuTLS certificate
1361
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1362
(gnutls.library.functions
1363
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1364
# Import the OpenPGP public key into the certificate
1365
(gnutls.library.functions
1366
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1367
gnutls.library.constants
1368
.GNUTLS_OPENPGP_FMT_RAW))
1369
# Verify the self signature in the key
1370
crtverify = ctypes.c_uint()
1371
(gnutls.library.functions
1372
.gnutls_openpgp_crt_verify_self(crt, 0,
1373
ctypes.byref(crtverify)))
1374
if crtverify.value != 0:
1375
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1376
raise (gnutls.errors.CertificateSecurityError
1377
("Verify failed"))
1378
# New buffer for the fingerprint
1379
buf = ctypes.create_string_buffer(20)
1380
buf_len = ctypes.c_size_t()
1381
# Get the fingerprint from the certificate into the buffer
1382
(gnutls.library.functions
1383
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1384
ctypes.byref(buf_len)))
1385
# Deinit the certificate
1386
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1387
# Convert the buffer to a Python bytestring
1388
fpr = ctypes.string_at(buf, buf_len.value)
1389
# Convert the bytestring to hexadecimal notation
1390
hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1391
return hex_fpr
1392
1393
1394
class MultiprocessingMixIn(object):
1395
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1396
def sub_process_main(self, request, address):
1397
try:
1398
self.finish_request(request, address)
1399
except:
1400
self.handle_error(request, address)
1401
self.close_request(request)
1402
1403
def process_request(self, request, address):
1404
"""Start a new process to process the request."""
1405
multiprocessing.Process(target = self.sub_process_main,
1406
args = (request, address)).start()
1407
1408
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1409
""" adds a pipe to the MixIn """
1410
def process_request(self, request, client_address):
1411
"""Overrides and wraps the original process_request().
1412
1413
This function creates a new pipe in self.pipe
1414
"""
1415
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1416
1417
super(MultiprocessingMixInWithPipe,
1418
self).process_request(request, client_address)
1419
self.child_pipe.close()
1420
self.add_pipe(parent_pipe)
1421
1422
def add_pipe(self, parent_pipe):
1423
"""Dummy function; override as necessary"""
1424
raise NotImplementedError
1425
1426
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1427
socketserver.TCPServer, object):
1428
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1429
503
1430
Attributes:
504
settings: Server settings
505
clients: Set() of Client objects
1431
enabled: Boolean; whether this server is activated yet
1432
interface: None or a network interface name (string)
1433
use_ipv6: Boolean; to use IPv6 or not
506
1434
"""
507
address_family = socket.AF_INET6
508
def __init__(self, *args, **kwargs):
509
if "settings" in kwargs:
510
self.settings = kwargs["settings"]
511
del kwargs["settings"]
512
if "clients" in kwargs:
513
self.clients = kwargs["clients"]
514
del kwargs["clients"]
515
return super(type(self), self).__init__(*args, **kwargs)
1435
def __init__(self, server_address, RequestHandlerClass,
1436
interface=None, use_ipv6=True):
1437
self.interface = interface
1438
if use_ipv6:
1439
self.address_family = socket.AF_INET6
1440
socketserver.TCPServer.__init__(self, server_address,
1441
RequestHandlerClass)
516
1442
def server_bind(self):
517
1443
"""This overrides the normal server_bind() function
518
1444
to bind to an interface if one was specified, and also NOT to
519
1445
bind to an address or port if they were not specified."""
520
if self.settings["interface"]:
521
# 25 is from /usr/include/asm-i486/socket.h
522
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
523
try:
524
self.socket.setsockopt(socket.SOL_SOCKET,
525
SO_BINDTODEVICE,
526
self.settings["interface"])
527
except socket.error, error:
528
if error[0] == errno.EPERM:
529
logger.error(u"No permission to"
530
u" bind to interface %s",
531
self.settings["interface"])
532
else:
533
raise error
1446
if self.interface is not None:
1447
if SO_BINDTODEVICE is None:
1448
logger.error("SO_BINDTODEVICE does not exist;"
1449
" cannot bind to interface %s",
1450
self.interface)
1451
else:
1452
try:
1453
self.socket.setsockopt(socket.SOL_SOCKET,
1454
SO_BINDTODEVICE,
1455
str(self.interface
1456
+ '\0'))
1457
except socket.error as error:
1458
if error[0] == errno.EPERM:
1459
logger.error("No permission to"
1460
" bind to interface %s",
1461
self.interface)
1462
elif error[0] == errno.ENOPROTOOPT:
1463
logger.error("SO_BINDTODEVICE not available;"
1464
" cannot bind to interface %s",
1465
self.interface)
1466
else:
1467
raise
534
1468
# Only bind(2) the socket if we really need to.
535
1469
if self.server_address[0] or self.server_address[1]:
536
1470
if not self.server_address[0]:
537
in6addr_any = "::"
538
self.server_address = (in6addr_any,
1471
if self.address_family == socket.AF_INET6:
1472
any_address = "::" # in6addr_any
1473
else:
1474
any_address = socket.INADDR_ANY
1475
self.server_address = (any_address,
539
1476
self.server_address[1])
540
1477
elif not self.server_address[1]:
541
1478
self.server_address = (self.server_address[0],
542
1479
0)
543
# if self.settings["interface"]:
1480
# if self.interface:
544
1481
# self.server_address = (self.server_address[0],
545
1482
# 0, # port
546
1483
# 0, # flowinfo
547
1484
# if_nametoindex
548
# (self.settings
549
# ["interface"]))
550
return super(type(self), self).server_bind()
1485
# (self.interface))
1486
return socketserver.TCPServer.server_bind(self)
1487
1488
1489
class MandosServer(IPv6_TCPServer):
1490
"""Mandos server.
1491
1492
Attributes:
1493
clients: set of Client objects
1494
gnutls_priority GnuTLS priority string
1495
use_dbus: Boolean; to emit D-Bus signals or not
1496
1497
Assumes a gobject.MainLoop event loop.
1498
"""
1499
def __init__(self, server_address, RequestHandlerClass,
1500
interface=None, use_ipv6=True, clients=None,
1501
gnutls_priority=None, use_dbus=True):
1502
self.enabled = False
1503
self.clients = clients
1504
if self.clients is None:
1505
self.clients = set()
1506
self.use_dbus = use_dbus
1507
self.gnutls_priority = gnutls_priority
1508
IPv6_TCPServer.__init__(self, server_address,
1509
RequestHandlerClass,
1510
interface = interface,
1511
use_ipv6 = use_ipv6)
1512
def server_activate(self):
1513
if self.enabled:
1514
return socketserver.TCPServer.server_activate(self)
1515
def enable(self):
1516
self.enabled = True
1517
def add_pipe(self, parent_pipe):
1518
# Call "handle_ipc" for both data and EOF events
1519
gobject.io_add_watch(parent_pipe.fileno(),
1520
gobject.IO_IN | gobject.IO_HUP,
1521
functools.partial(self.handle_ipc,
1522
parent_pipe = parent_pipe))
1523
1524
def handle_ipc(self, source, condition, parent_pipe=None,
1525
client_object=None):
1526
condition_names = {
1527
gobject.IO_IN: "IN", # There is data to read.
1528
gobject.IO_OUT: "OUT", # Data can be written (without
1529
# blocking).
1530
gobject.IO_PRI: "PRI", # There is urgent data to read.
1531
gobject.IO_ERR: "ERR", # Error condition.
1532
gobject.IO_HUP: "HUP" # Hung up (the connection has been
1533
# broken, usually for pipes and
1534
# sockets).
1535
}
1536
conditions_string = ' | '.join(name
1537
for cond, name in
1538
condition_names.iteritems()
1539
if cond & condition)
1540
# error or the other end of multiprocessing.Pipe has closed
1541
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1542
return False
1543
1544
# Read a request from the child
1545
request = parent_pipe.recv()
1546
command = request[0]
1547
1548
if command == 'init':
1549
fpr = request[1]
1550
address = request[2]
1551
1552
for c in self.clients:
1553
if c.fingerprint == fpr:
1554
client = c
1555
break
1556
else:
1557
logger.info("Client not found for fingerprint: %s, ad"
1558
"dress: %s", fpr, address)
1559
if self.use_dbus:
1560
# Emit D-Bus signal
1561
mandos_dbus_service.ClientNotFound(fpr, address[0])
1562
parent_pipe.send(False)
1563
return False
1564
1565
gobject.io_add_watch(parent_pipe.fileno(),
1566
gobject.IO_IN | gobject.IO_HUP,
1567
functools.partial(self.handle_ipc,
1568
parent_pipe = parent_pipe,
1569
client_object = client))
1570
parent_pipe.send(True)
1571
# remove the old hook in favor of the new above hook on same fileno
1572
return False
1573
if command == 'funcall':
1574
funcname = request[1]
1575
args = request[2]
1576
kwargs = request[3]
1577
1578
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1579
1580
if command == 'getattr':
1581
attrname = request[1]
1582
if callable(client_object.__getattribute__(attrname)):
1583
parent_pipe.send(('function',))
1584
else:
1585
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1586
1587
if command == 'setattr':
1588
attrname = request[1]
1589
value = request[2]
1590
setattr(client_object, attrname, value)
1591
1592
return True
551
1593
552
1594
553
1595
def string_to_delta(interval):
554
1596
"""Parse a string and return a datetime.timedelta
555
1597
556
1598
>>> string_to_delta('7d')
557
1599
datetime.timedelta(7)
558
1600
>>> string_to_delta('60s')
561
1603
datetime.timedelta(0, 3600)
562
1604
>>> string_to_delta('24h')
563
1605
datetime.timedelta(1)
564
>>> string_to_delta(u'1w')
1606
>>> string_to_delta('1w')
565
1607
datetime.timedelta(7)
1608
>>> string_to_delta('5m 30s')
1609
datetime.timedelta(0, 330)
566
1610
"""
567
try:
568
suffix=unicode(interval[-1])
569
value=int(interval[:-1])
570
if suffix == u"d":
571
delta = datetime.timedelta(value)
572
elif suffix == u"s":
573
delta = datetime.timedelta(0, value)
574
elif suffix == u"m":
575
delta = datetime.timedelta(0, 0, 0, 0, value)
576
elif suffix == u"h":
577
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
578
elif suffix == u"w":
579
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
580
else:
581
raise ValueError
582
except (ValueError, IndexError):
583
raise ValueError
584
return delta
585
586
587
def server_state_changed(state):
588
"""Derived from the Avahi example code"""
589
if state == avahi.SERVER_COLLISION:
590
logger.error(u"Server name collision")
591
service.remove()
592
elif state == avahi.SERVER_RUNNING:
593
service.add()
594
595
596
def entry_group_state_changed(state, error):
597
"""Derived from the Avahi example code"""
598
logger.debug(u"state change: %i", state)
599
600
if state == avahi.ENTRY_GROUP_ESTABLISHED:
601
logger.debug(u"Service established.")
602
elif state == avahi.ENTRY_GROUP_COLLISION:
603
logger.warning(u"Service name collision.")
604
service.rename()
605
elif state == avahi.ENTRY_GROUP_FAILURE:
606
logger.critical(u"Error in group state changed %s",
607
unicode(error))
608
raise AvahiGroupError("State changed: %s", str(error))
1611
timevalue = datetime.timedelta(0)
1612
for s in interval.split():
1613
try:
1614
suffix = unicode(s[-1])
1615
value = int(s[:-1])
1616
if suffix == "d":
1617
delta = datetime.timedelta(value)
1618
elif suffix == "s":
1619
delta = datetime.timedelta(0, value)
1620
elif suffix == "m":
1621
delta = datetime.timedelta(0, 0, 0, 0, value)
1622
elif suffix == "h":
1623
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1624
elif suffix == "w":
1625
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1626
else:
1627
raise ValueError("Unknown suffix %r" % suffix)
1628
except (ValueError, IndexError) as e:
1629
raise ValueError(*(e.args))
1630
timevalue += delta
1631
return timevalue
1632
609
1633
610
1634
def if_nametoindex(interface):
611
"""Call the C function if_nametoindex(), or equivalent"""
1635
"""Call the C function if_nametoindex(), or equivalent
1636
1637
Note: This function cannot accept a unicode string."""
612
1638
global if_nametoindex
613
1639
try:
614
if "ctypes.util" not in sys.modules:
615
import ctypes.util
616
if_nametoindex = ctypes.cdll.LoadLibrary\
617
(ctypes.util.find_library("c")).if_nametoindex
1640
if_nametoindex = (ctypes.cdll.LoadLibrary
1641
(ctypes.util.find_library("c"))
1642
.if_nametoindex)
618
1643
except (OSError, AttributeError):
619
if "struct" not in sys.modules:
620
import struct
621
if "fcntl" not in sys.modules:
622
import fcntl
1644
logger.warning("Doing if_nametoindex the hard way")
623
1645
def if_nametoindex(interface):
624
1646
"Get an interface index the hard way, i.e. using fcntl()"
625
1647
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
626
s = socket.socket()
627
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
628
struct.pack("16s16x", interface))
629
s.close()
630
interface_index = struct.unpack("I", ifreq[16:20])[0]
1648
with contextlib.closing(socket.socket()) as s:
1649
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1650
struct.pack(str("16s16x"),
1651
interface))
1652
interface_index = struct.unpack(str("I"),
1653
ifreq[16:20])[0]
631
1654
return interface_index
632
1655
return if_nametoindex(interface)
633
1656
634
1657
635
1658
def daemon(nochdir = False, noclose = False):
636
1659
"""See daemon(3). Standard BSD Unix function.
1660
637
1661
This should really exist as os.daemon, but it doesn't (yet)."""
638
1662
if os.fork():
639
1663
sys.exit()
647
1671
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
648
1672
if not stat.S_ISCHR(os.fstat(null).st_mode):
649
1673
raise OSError(errno.ENODEV,
650
"/dev/null not a character device")
1674
"%s not a character device"
1675
% os.path.devnull)
651
1676
os.dup2(null, sys.stdin.fileno())
652
1677
os.dup2(null, sys.stdout.fileno())
653
1678
os.dup2(null, sys.stderr.fileno())
656
1681
657
1682
658
1683
def main():
659
global main_loop_started
660
main_loop_started = False
661
662
parser = OptionParser(version = "%%prog %s" % version)
663
parser.add_option("-i", "--interface", type="string",
664
metavar="IF", help="Bind to interface IF")
665
parser.add_option("-a", "--address", type="string",
666
help="Address to listen for requests on")
667
parser.add_option("-p", "--port", type="int",
668
help="Port number to receive requests on")
669
parser.add_option("--check", action="store_true", default=False,
670
help="Run self-test")
671
parser.add_option("--debug", action="store_true",
672
help="Debug mode; run in foreground and log to"
673
" terminal")
674
parser.add_option("--priority", type="string", help="GnuTLS"
675
" priority string (see GnuTLS documentation)")
676
parser.add_option("--servicename", type="string", metavar="NAME",
677
help="Zeroconf service name")
678
parser.add_option("--configdir", type="string",
679
default="/etc/mandos", metavar="DIR",
680
help="Directory to search for configuration"
681
" files")
682
(options, args) = parser.parse_args()
1684
1685
##################################################################
1686
# Parsing of options, both command line and config file
1687
1688
parser = argparse.ArgumentParser()
1689
parser.add_argument("-v", "--version", action="version",
1690
version = "%%(prog)s %s" % version,
1691
help="show version number and exit")
1692
parser.add_argument("-i", "--interface", metavar="IF",
1693
help="Bind to interface IF")
1694
parser.add_argument("-a", "--address",
1695
help="Address to listen for requests on")
1696
parser.add_argument("-p", "--port", type=int,
1697
help="Port number to receive requests on")
1698
parser.add_argument("--check", action="store_true",
1699
help="Run self-test")
1700
parser.add_argument("--debug", action="store_true",
1701
help="Debug mode; run in foreground and log"
1702
" to terminal")
1703
parser.add_argument("--debuglevel", metavar="LEVEL",
1704
help="Debug level for stdout output")
1705
parser.add_argument("--priority", help="GnuTLS"
1706
" priority string (see GnuTLS documentation)")
1707
parser.add_argument("--servicename",
1708
metavar="NAME", help="Zeroconf service name")
1709
parser.add_argument("--configdir",
1710
default="/etc/mandos", metavar="DIR",
1711
help="Directory to search for configuration"
1712
" files")
1713
parser.add_argument("--no-dbus", action="store_false",
1714
dest="use_dbus", help="Do not provide D-Bus"
1715
" system bus interface")
1716
parser.add_argument("--no-ipv6", action="store_false",
1717
dest="use_ipv6", help="Do not use IPv6")
1718
options = parser.parse_args()
683
1719
684
1720
if options.check:
685
1721
import doctest
694
1730
"priority":
695
1731
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
696
1732
"servicename": "Mandos",
1733
"use_dbus": "True",
1734
"use_ipv6": "True",
1735
"debuglevel": "",
697
1736
}
698
1737
699
1738
# Parse config file for server-global settings
700
server_config = ConfigParser.SafeConfigParser(server_defaults)
1739
server_config = configparser.SafeConfigParser(server_defaults)
701
1740
del server_defaults
702
server_config.read(os.path.join(options.configdir, "mandos.conf"))
703
server_section = "server"
1741
server_config.read(os.path.join(options.configdir,
1742
"mandos.conf"))
704
1743
# Convert the SafeConfigParser object to a dict
705
server_settings = dict(server_config.items(server_section))
706
# Use getboolean on the boolean config option
707
server_settings["debug"] = server_config.getboolean\
708
(server_section, "debug")
1744
server_settings = server_config.defaults()
1745
# Use the appropriate methods on the non-string config options
1746
for option in ("debug", "use_dbus", "use_ipv6"):
1747
server_settings[option] = server_config.getboolean("DEFAULT",
1748
option)
1749
if server_settings["port"]:
1750
server_settings["port"] = server_config.getint("DEFAULT",
1751
"port")
709
1752
del server_config
710
1753
711
1754
# Override the settings from the config file with command line
712
1755
# options, if set.
713
1756
for option in ("interface", "address", "port", "debug",
714
"priority", "servicename", "configdir"):
1757
"priority", "servicename", "configdir",
1758
"use_dbus", "use_ipv6", "debuglevel"):
715
1759
value = getattr(options, option)
716
1760
if value is not None:
717
1761
server_settings[option] = value
718
1762
del options
1763
# Force all strings to be unicode
1764
for option in server_settings.keys():
1765
if type(server_settings[option]) is str:
1766
server_settings[option] = unicode(server_settings[option])
719
1767
# Now we have our good server settings in "server_settings"
720
1768
1769
##################################################################
1770
1771
# For convenience
721
1772
debug = server_settings["debug"]
722
723
if not debug:
724
syslogger.setLevel(logging.WARNING)
725
console.setLevel(logging.WARNING)
726
1773
debuglevel = server_settings["debuglevel"]
1774
use_dbus = server_settings["use_dbus"]
1775
use_ipv6 = server_settings["use_ipv6"]
1776
727
1777
if server_settings["servicename"] != "Mandos":
728
syslogger.setFormatter(logging.Formatter\
729
('Mandos (%s): %%(levelname)s:'
730
' %%(message)s'
1778
syslogger.setFormatter(logging.Formatter
1779
('Mandos (%s) [%%(process)d]:'
1780
' %%(levelname)s: %%(message)s'
731
1781
% server_settings["servicename"]))
732
1782
733
1783
# Parse config file with clients
734
client_defaults = { "timeout": "1h",
735
"interval": "5m",
1784
client_defaults = { "timeout": "5m",
1785
"extended_timeout": "15m",
1786
"interval": "2m",
736
1787
"checker": "fping -q -- %%(host)s",
1788
"host": "",
1789
"approval_delay": "0s",
1790
"approval_duration": "1s",
737
1791
}
738
client_config = ConfigParser.SafeConfigParser(client_defaults)
1792
client_config = configparser.SafeConfigParser(client_defaults)
739
1793
client_config.read(os.path.join(server_settings["configdir"],
740
1794
"clients.conf"))
741
1795
742
global service
743
service = AvahiService(name = server_settings["servicename"],
744
type = "_mandos._tcp", );
745
if server_settings["interface"]:
746
service.interface = if_nametoindex(server_settings["interface"])
1796
global mandos_dbus_service
1797
mandos_dbus_service = None
1798
1799
tcp_server = MandosServer((server_settings["address"],
1800
server_settings["port"]),
1801
ClientHandler,
1802
interface=(server_settings["interface"]
1803
or None),
1804
use_ipv6=use_ipv6,
1805
gnutls_priority=
1806
server_settings["priority"],
1807
use_dbus=use_dbus)
1808
if not debug:
1809
pidfilename = "/var/run/mandos.pid"
1810
try:
1811
pidfile = open(pidfilename, "w")
1812
except IOError:
1813
logger.error("Could not open file %r", pidfilename)
1814
1815
try:
1816
uid = pwd.getpwnam("_mandos").pw_uid
1817
gid = pwd.getpwnam("_mandos").pw_gid
1818
except KeyError:
1819
try:
1820
uid = pwd.getpwnam("mandos").pw_uid
1821
gid = pwd.getpwnam("mandos").pw_gid
1822
except KeyError:
1823
try:
1824
uid = pwd.getpwnam("nobody").pw_uid
1825
gid = pwd.getpwnam("nobody").pw_gid
1826
except KeyError:
1827
uid = 65534
1828
gid = 65534
1829
try:
1830
os.setgid(gid)
1831
os.setuid(uid)
1832
except OSError as error:
1833
if error[0] != errno.EPERM:
1834
raise error
1835
1836
if not debug and not debuglevel:
1837
syslogger.setLevel(logging.WARNING)
1838
console.setLevel(logging.WARNING)
1839
if debuglevel:
1840
level = getattr(logging, debuglevel.upper())
1841
syslogger.setLevel(level)
1842
console.setLevel(level)
1843
1844
if debug:
1845
# Enable all possible GnuTLS debugging
1846
1847
# "Use a log level over 10 to enable all debugging options."
1848
# - GnuTLS manual
1849
gnutls.library.functions.gnutls_global_set_log_level(11)
1850
1851
@gnutls.library.types.gnutls_log_func
1852
def debug_gnutls(level, string):
1853
logger.debug("GnuTLS: %s", string[:-1])
1854
1855
(gnutls.library.functions
1856
.gnutls_global_set_log_function(debug_gnutls))
1857
1858
# Redirect stdin so all checkers get /dev/null
1859
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1860
os.dup2(null, sys.stdin.fileno())
1861
if null > 2:
1862
os.close(null)
1863
else:
1864
# No console logging
1865
logger.removeHandler(console)
1866
1867
# Need to fork before connecting to D-Bus
1868
if not debug:
1869
# Close all input and output, do double fork, etc.
1870
daemon()
747
1871
748
1872
global main_loop
749
global bus
750
global server
751
1873
# From the Avahi example code
752
1874
DBusGMainLoop(set_as_default=True )
753
1875
main_loop = gobject.MainLoop()
754
1876
bus = dbus.SystemBus()
755
server = dbus.Interface(
756
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
757
avahi.DBUS_INTERFACE_SERVER )
758
1877
# End of Avahi example code
759
760
clients = Set()
761
def remove_from_clients(client):
762
clients.remove(client)
763
if not clients:
764
logger.critical(u"No clients left, exiting")
765
sys.exit()
766
767
clients.update(Set(Client(name = section,
768
stop_hook = remove_from_clients,
769
config
770
= dict(client_config.items(section)))
771
for section in client_config.sections()))
772
if not clients:
773
logger.critical(u"No clients defined")
774
sys.exit(1)
775
1878
if use_dbus:
1879
try:
1880
bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1881
bus, do_not_queue=True)
1882
except dbus.exceptions.NameExistsException as e:
1883
logger.error(unicode(e) + ", disabling D-Bus")
1884
use_dbus = False
1885
server_settings["use_dbus"] = False
1886
tcp_server.use_dbus = False
1887
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1888
service = AvahiService(name = server_settings["servicename"],
1889
servicetype = "_mandos._tcp",
1890
protocol = protocol, bus = bus)
1891
if server_settings["interface"]:
1892
service.interface = (if_nametoindex
1893
(str(server_settings["interface"])))
1894
1895
global multiprocessing_manager
1896
multiprocessing_manager = multiprocessing.Manager()
1897
1898
client_class = Client
1899
if use_dbus:
1900
client_class = functools.partial(ClientDBus, bus = bus)
1901
def client_config_items(config, section):
1902
special_settings = {
1903
"approved_by_default":
1904
lambda: config.getboolean(section,
1905
"approved_by_default"),
1906
}
1907
for name, value in config.items(section):
1908
try:
1909
yield (name, special_settings[name]())
1910
except KeyError:
1911
yield (name, value)
1912
1913
tcp_server.clients.update(set(
1914
client_class(name = section,
1915
config= dict(client_config_items(
1916
client_config, section)))
1917
for section in client_config.sections()))
1918
if not tcp_server.clients:
1919
logger.warning("No clients defined")
1920
776
1921
if not debug:
777
logger.removeHandler(console)
778
daemon()
1922
try:
1923
with pidfile:
1924
pid = os.getpid()
1925
pidfile.write(str(pid) + "\n".encode("utf-8"))
1926
del pidfile
1927
except IOError:
1928
logger.error("Could not write to file %r with PID %d",
1929
pidfilename, pid)
1930
except NameError:
1931
# "pidfile" was never created
1932
pass
1933
del pidfilename
1934
1935
signal.signal(signal.SIGINT, signal.SIG_IGN)
1936
1937
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1938
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
779
1939
780
pidfilename = "/var/run/mandos/mandos.pid"
781
pid = os.getpid()
782
try:
783
pidfile = open(pidfilename, "w")
784
pidfile.write(str(pid) + "\n")
785
pidfile.close()
786
del pidfile
787
except IOError, err:
788
logger.error(u"Could not write %s file with PID %d",
789
pidfilename, os.getpid())
1940
if use_dbus:
1941
class MandosDBusService(dbus.service.Object):
1942
"""A D-Bus proxy object"""
1943
def __init__(self):
1944
dbus.service.Object.__init__(self, bus, "/")
1945
_interface = "se.bsnet.fukt.Mandos"
1946
1947
@dbus.service.signal(_interface, signature="o")
1948
def ClientAdded(self, objpath):
1949
"D-Bus signal"
1950
pass
1951
1952
@dbus.service.signal(_interface, signature="ss")
1953
def ClientNotFound(self, fingerprint, address):
1954
"D-Bus signal"
1955
pass
1956
1957
@dbus.service.signal(_interface, signature="os")
1958
def ClientRemoved(self, objpath, name):
1959
"D-Bus signal"
1960
pass
1961
1962
@dbus.service.method(_interface, out_signature="ao")
1963
def GetAllClients(self):
1964
"D-Bus method"
1965
return dbus.Array(c.dbus_object_path
1966
for c in tcp_server.clients)
1967
1968
@dbus.service.method(_interface,
1969
out_signature="a{oa{sv}}")
1970
def GetAllClientsWithProperties(self):
1971
"D-Bus method"
1972
return dbus.Dictionary(
1973
((c.dbus_object_path, c.GetAll(""))
1974
for c in tcp_server.clients),
1975
signature="oa{sv}")
1976
1977
@dbus.service.method(_interface, in_signature="o")
1978
def RemoveClient(self, object_path):
1979
"D-Bus method"
1980
for c in tcp_server.clients:
1981
if c.dbus_object_path == object_path:
1982
tcp_server.clients.remove(c)
1983
c.remove_from_connection()
1984
# Don't signal anything except ClientRemoved
1985
c.disable(quiet=True)
1986
# Emit D-Bus signal
1987
self.ClientRemoved(object_path, c.name)
1988
return
1989
raise KeyError(object_path)
1990
1991
del _interface
1992
1993
mandos_dbus_service = MandosDBusService()
790
1994
791
1995
def cleanup():
792
1996
"Cleanup function; run on exit"
793
global group
794
# From the Avahi example code
795
if not group is None:
796
group.Free()
797
group = None
798
# End of Avahi example code
1997
service.cleanup()
799
1998
800
while clients:
801
client = clients.pop()
802
client.stop_hook = None
803
client.stop()
1999
while tcp_server.clients:
2000
client = tcp_server.clients.pop()
2001
if use_dbus:
2002
client.remove_from_connection()
2003
client.disable_hook = None
2004
# Don't signal anything except ClientRemoved
2005
client.disable(quiet=True)
2006
if use_dbus:
2007
# Emit D-Bus signal
2008
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2009
client.name)
804
2010
805
2011
atexit.register(cleanup)
806
2012
807
if not debug:
808
signal.signal(signal.SIGINT, signal.SIG_IGN)
809
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
810
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
811
812
for client in clients:
813
client.start()
814
815
tcp_server = IPv6_TCPServer((server_settings["address"],
816
server_settings["port"]),
817
tcp_handler,
818
settings=server_settings,
819
clients=clients)
2013
for client in tcp_server.clients:
2014
if use_dbus:
2015
# Emit D-Bus signal
2016
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2017
client.enable()
2018
2019
tcp_server.enable()
2020
tcp_server.server_activate()
2021
820
2022
# Find out what port we got
821
2023
service.port = tcp_server.socket.getsockname()[1]
822
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
823
u" scope_id %d" % tcp_server.socket.getsockname())
2024
if use_ipv6:
2025
logger.info("Now listening on address %r, port %d,"
2026
" flowinfo %d, scope_id %d"
2027
% tcp_server.socket.getsockname())
2028
else: # IPv4
2029
logger.info("Now listening on address %r, port %d"
2030
% tcp_server.socket.getsockname())
824
2031
825
2032
#service.interface = tcp_server.socket.getsockname()[3]
826
2033
827
2034
try:
828
2035
# From the Avahi example code
829
server.connect_to_signal("StateChanged", server_state_changed)
830
2036
try:
831
server_state_changed(server.GetState())
832
except dbus.exceptions.DBusException, error:
833
logger.critical(u"DBusException: %s", error)
2037
service.activate()
2038
except dbus.exceptions.DBusException as error:
2039
logger.critical("DBusException: %s", error)
2040
cleanup()
834
2041
sys.exit(1)
835
2042
# End of Avahi example code
836
2043
837
2044
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
838
2045
lambda *args, **kwargs:
839
tcp_server.handle_request\
840
(*args[2:], **kwargs) or True)
2046
(tcp_server.handle_request
2047
(*args[2:], **kwargs) or True))
841
2048
842
logger.debug(u"Starting main loop")
843
main_loop_started = True
2049
logger.debug("Starting main loop")
844
2050
main_loop.run()
845
except AvahiError, error:
846
logger.critical(u"AvahiError: %s" + unicode(error))
2051
except AvahiError as error:
2052
logger.critical("AvahiError: %s", error)
2053
cleanup()
847
2054
sys.exit(1)
848
2055
except KeyboardInterrupt:
849
2056
if debug:
850
print
2057
print("", file=sys.stderr)
2058
logger.debug("Server received KeyboardInterrupt")
2059
logger.debug("Server exiting")
2060
# Must run before the D-Bus bus name gets deregistered
2061
cleanup()
851
2062
852
2063
if __name__ == '__main__':
853
2064
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0