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- Committer: Björn Påhlsson
- Date: 2008-08-12 20:04:37 UTC
- mfrom: (71 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 73.
- Revision ID: belorn@braxen-20080812200437-8udu4wwo86radn3l
Merge.
- 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
version = "1.0"
65
88
66
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'))
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'))
95
72
logger.addHandler(syslogger)
96
73
97
74
console = logging.StreamHandler()
98
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
' %(levelname)s:'
75
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
100
76
' %(message)s'))
101
77
logger.addHandler(console)
102
78
103
79
class AvahiError(Exception):
104
def __init__(self, value, *args, **kwargs):
80
def __init__(self, value):
105
81
self.value = value
106
super(AvahiError, self).__init__(value, *args, **kwargs)
107
def __unicode__(self):
108
return unicode(repr(self.value))
82
def __str__(self):
83
return repr(self.value)
109
84
110
85
class AvahiServiceError(AvahiError):
111
86
pass
116
91
117
92
class AvahiService(object):
118
93
"""An Avahi (Zeroconf) service.
119
120
94
Attributes:
121
95
interface: integer; avahi.IF_UNSPEC or an interface index.
122
96
Used to optionally bind to the specified interface.
130
104
max_renames: integer; maximum number of renames
131
105
rename_count: integer; counter so we only rename after collisions
132
106
a sensible number of times
133
group: D-Bus Entry Group
134
server: D-Bus Server
135
bus: dbus.SystemBus()
136
107
"""
137
108
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):
109
type = None, port = None, TXT = None, domain = "",
110
host = "", max_renames = 32768):
141
111
self.interface = interface
142
112
self.name = name
143
self.type = servicetype
113
self.type = type
144
114
self.port = port
145
self.TXT = TXT if TXT is not None else []
115
if TXT is None:
116
self.TXT = []
117
else:
118
self.TXT = TXT
146
119
self.domain = domain
147
120
self.host = host
148
121
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
122
def rename(self):
156
123
"""Derived from the Avahi example code"""
157
124
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)
125
logger.critical(u"No suitable service name found after %i"
126
u" retries, exiting.", rename_count)
161
127
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))
128
name = server.GetAlternativeServiceName(name)
129
logger.error(u"Changing name to %r ...", name)
130
syslogger.setFormatter(logging.Formatter\
131
('Mandos (%s): %%(levelname)s:'
132
' %%(message)s' % name))
169
133
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)
134
self.add()
176
135
self.rename_count += 1
177
136
def remove(self):
178
137
"""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()
138
if group is not None:
139
group.Reset()
184
140
def add(self):
185
141
"""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())
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
142
global group
143
if group is None:
144
group = dbus.Interface\
145
(bus.get_object(avahi.DBUS_NAME,
146
server.EntryGroupNew()),
147
avahi.DBUS_INTERFACE_ENTRY_GROUP)
148
group.connect_to_signal('StateChanged',
149
entry_group_state_changed)
150
logger.debug(u"Adding service '%s' of type '%s' ...",
151
service.name, service.type)
152
group.AddService(
153
self.interface, # interface
154
avahi.PROTO_INET6, # protocol
155
dbus.UInt32(0), # flags
156
self.name, self.type,
157
self.domain, self.host,
158
dbus.UInt16(self.port),
159
avahi.string_array_to_txt_array(self.TXT))
160
group.Commit()
161
162
# From the Avahi example code:
163
group = None # our entry group
164
# End of Avahi example code
165
166
273
167
class Client(object):
274
168
"""A representation of a client host served by this server.
275
276
169
Attributes:
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
170
name: string; from the config file, used in log messages
171
fingerprint: string (40 or 32 hexadecimal digits); used to
172
uniquely identify the client
173
secret: bytestring; sent verbatim (over TLS) to client
174
host: string; available for use by the checker command
175
created: datetime.datetime(); object creation, not client host
176
last_checked_ok: datetime.datetime() or None if not yet checked OK
177
timeout: datetime.timedelta(); How long from last_checked_ok
178
until this client is invalid
179
interval: datetime.timedelta(); How often to start a new checker
180
stop_hook: If set, called by stop() as stop_hook(self)
181
checker: subprocess.Popen(); a running checker process used
182
to see if the client lives.
183
'None' if no process is running.
184
checker_initiator_tag: a gobject event source tag, or None
185
stop_initiator_tag: - '' -
186
checker_callback_tag: - '' -
187
checker_command: string; External command which is run to check if
188
client lives. %() expansions are done at
286
189
runtime with vars(self) as dict, so that for
287
190
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()
294
fingerprint: string (40 or 32 hexadecimal digits); used to
295
uniquely identify the client
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
191
Private attibutes:
192
_timeout: Real variable for 'timeout'
193
_interval: Real variable for 'interval'
194
_timeout_milliseconds: Used when calling gobject.timeout_add()
195
_interval_milliseconds: - '' -
310
196
"""
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):
197
def _set_timeout(self, timeout):
198
"Setter function for 'timeout' attribute"
199
self._timeout = timeout
200
self._timeout_milliseconds = ((self.timeout.days
201
* 24 * 60 * 60 * 1000)
202
+ (self.timeout.seconds * 1000)
203
+ (self.timeout.microseconds
204
// 1000))
205
timeout = property(lambda self: self._timeout,
206
_set_timeout)
207
del _set_timeout
208
def _set_interval(self, interval):
209
"Setter function for 'interval' attribute"
210
self._interval = interval
211
self._interval_milliseconds = ((self.interval.days
212
* 24 * 60 * 60 * 1000)
213
+ (self.interval.seconds
214
* 1000)
215
+ (self.interval.microseconds
216
// 1000))
217
interval = property(lambda self: self._interval,
218
_set_interval)
219
del _set_interval
220
def __init__(self, name = None, stop_hook=None, config={}):
333
221
"""Note: the 'checker' key in 'config' sets the
334
222
'checker_command' attribute and *not* the 'checker'
335
223
attribute."""
336
224
self.name = name
337
if config is None:
338
config = {}
339
logger.debug("Creating client %r", self.name)
225
logger.debug(u"Creating client %r", self.name)
340
226
# Uppercase and remove spaces from fingerprint for later
341
227
# comparison purposes with return value from the fingerprint()
342
228
# function
343
self.fingerprint = (config["fingerprint"].upper()
344
.replace(" ", ""))
345
logger.debug(" Fingerprint: %s", self.fingerprint)
229
self.fingerprint = config["fingerprint"].upper()\
230
.replace(u" ", u"")
231
logger.debug(u" Fingerprint: %s", self.fingerprint)
346
232
if "secret" in config:
347
self.secret = config["secret"].decode("base64")
233
self.secret = config["secret"].decode(u"base64")
348
234
elif "secfile" in config:
349
with open(os.path.expanduser(os.path.expandvars
350
(config["secfile"])),
351
"rb") as secfile:
352
self.secret = secfile.read()
235
sf = open(config["secfile"])
236
self.secret = sf.read()
237
sf.close()
353
238
else:
354
raise TypeError("No secret or secfile for client %s"
239
raise TypeError(u"No secret or secfile for client %s"
355
240
% self.name)
356
241
self.host = config.get("host", "")
357
self.created = datetime.datetime.utcnow()
358
self.enabled = False
359
self.last_approval_request = None
360
self.last_enabled = None
242
self.created = datetime.datetime.now()
361
243
self.last_checked_ok = None
362
244
self.timeout = string_to_delta(config["timeout"])
363
self.extended_timeout = string_to_delta(config["extended_timeout"])
364
245
self.interval = string_to_delta(config["interval"])
365
self.disable_hook = disable_hook
246
self.stop_hook = stop_hook
366
247
self.checker = None
367
248
self.checker_initiator_tag = None
368
self.disable_initiator_tag = None
369
self.expires = None
249
self.stop_initiator_tag = None
370
250
self.checker_callback_tag = None
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):
251
self.check_command = config["checker"]
252
def start(self):
390
253
"""Start this client's checker and timeout hooks"""
391
if getattr(self, "enabled", False):
392
# Already enabled
393
return
394
self.send_changedstate()
395
254
# Schedule a new checker to be started an 'interval' from now,
396
255
# and every interval from then on.
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()
256
self.checker_initiator_tag = gobject.timeout_add\
257
(self._interval_milliseconds,
258
self.start_checker)
407
259
# Also start a new checker *right now*.
408
260
self.start_checker()
409
410
def disable(self, quiet=True):
411
"""Disable this client."""
412
if not getattr(self, "enabled", False):
261
# Schedule a stop() when 'timeout' has passed
262
self.stop_initiator_tag = gobject.timeout_add\
263
(self._timeout_milliseconds,
264
self.stop)
265
def stop(self):
266
"""Stop this client.
267
The possibility that a client might be restarted is left open,
268
but not currently used."""
269
# If this client doesn't have a secret, it is already stopped.
270
if hasattr(self, "secret") and self.secret:
271
logger.info(u"Stopping client %s", self.name)
272
self.secret = None
273
else:
413
274
return False
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
275
if getattr(self, "stop_initiator_tag", False):
276
gobject.source_remove(self.stop_initiator_tag)
277
self.stop_initiator_tag = None
422
278
if getattr(self, "checker_initiator_tag", False):
423
279
gobject.source_remove(self.checker_initiator_tag)
424
280
self.checker_initiator_tag = None
425
281
self.stop_checker()
426
if self.disable_hook:
427
self.disable_hook(self)
428
self.enabled = False
282
if self.stop_hook:
283
self.stop_hook(self)
429
284
# Do not run this again if called by a gobject.timeout_add
430
285
return False
431
432
286
def __del__(self):
433
self.disable_hook = None
434
self.disable()
435
436
def checker_callback(self, pid, condition, command):
287
self.stop_hook = None
288
self.stop()
289
def checker_callback(self, pid, condition):
437
290
"""The checker has completed, so take appropriate actions."""
291
now = datetime.datetime.now()
438
292
self.checker_callback_tag = None
439
293
self.checker = None
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?",
294
if os.WIFEXITED(condition) \
295
and (os.WEXITSTATUS(condition) == 0):
296
logger.info(u"Checker for %(name)s succeeded",
297
vars(self))
298
self.last_checked_ok = now
299
gobject.source_remove(self.stop_initiator_tag)
300
self.stop_initiator_tag = gobject.timeout_add\
301
(self._timeout_milliseconds,
302
self.stop)
303
elif not os.WIFEXITED(condition):
304
logger.warning(u"Checker for %(name)s crashed?",
451
305
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
306
else:
307
logger.info(u"Checker for %(name)s failed",
308
vars(self))
471
309
def start_checker(self):
472
310
"""Start a new checker subprocess if one is not running.
473
474
311
If a checker already exists, leave it running and do
475
312
nothing."""
476
313
# The reason for not killing a running checker is that if we
479
316
# client would inevitably timeout, since no checker would get
480
317
# a chance to run to completion. If we instead leave running
481
318
# checkers alone, the checker would have to take more time
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
319
# than 'timeout' for the client to be declared invalid, which
320
# is as it should be.
499
321
if self.checker is None:
500
322
try:
501
# In case checker_command has exactly one % operator
502
command = self.checker_command % self.host
323
# In case check_command has exactly one % operator
324
command = self.check_command % self.host
503
325
except TypeError:
504
326
# Escape attributes for the shell
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
327
escaped_attrs = dict((key, re.escape(str(val)))
328
for key, val in
329
vars(self).iteritems())
513
330
try:
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)
331
command = self.check_command % escaped_attrs
332
except TypeError, error:
333
logger.error(u'Could not format string "%s":'
334
u' %s', self.check_command, error)
518
335
return True # Try again later
519
self.current_checker_command = command
520
336
try:
521
logger.info("Starting checker %r for %s",
337
logger.info(u"Starting checker %r for %s",
522
338
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.)
527
339
self.checker = subprocess.Popen(command,
528
340
close_fds=True,
529
341
shell=True, cwd="/")
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",
342
self.checker_callback_tag = gobject.child_watch_add\
343
(self.checker.pid,
344
self.checker_callback)
345
except subprocess.OSError, error:
346
logger.error(u"Failed to start subprocess: %s",
542
347
error)
543
348
# Re-run this periodically if run by gobject.timeout_add
544
349
return True
545
546
350
def stop_checker(self):
547
351
"""Force the checker process, if any, to stop."""
548
352
if self.checker_callback_tag:
550
354
self.checker_callback_tag = None
551
355
if getattr(self, "checker", None) is None:
552
356
return
553
logger.debug("Stopping checker for %(name)s", vars(self))
357
logger.debug(u"Stopping checker for %(name)s", vars(self))
554
358
try:
555
359
os.kill(self.checker.pid, signal.SIGTERM)
556
#time.sleep(0.5)
360
#os.sleep(0.5)
557
361
#if self.checker.poll() is None:
558
362
# os.kill(self.checker.pid, signal.SIGKILL)
559
except OSError as error:
363
except OSError, error:
560
364
if error.errno != errno.ESRCH: # No such process
561
365
raise
562
366
self.checker = None
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.
367
def still_valid(self):
368
"""Has the timeout not yet passed for this client?"""
369
now = datetime.datetime.now()
370
if self.last_checked_ok is None:
371
return now < (self.created + self.timeout)
372
else:
373
return now < (self.last_checked_ok + self.timeout)
374
375
376
def peer_certificate(session):
377
"Return the peer's OpenPGP certificate as a bytestring"
378
# If not an OpenPGP certificate...
379
if gnutls.library.functions.gnutls_certificate_type_get\
380
(session._c_object) \
381
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
382
# ...do the normal thing
383
return session.peer_certificate
384
list_size = ctypes.c_uint()
385
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
386
(session._c_object, ctypes.byref(list_size))
387
if list_size.value == 0:
388
return None
389
cert = cert_list[0]
390
return ctypes.string_at(cert.data, cert.size)
391
392
393
def fingerprint(openpgp):
394
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
395
# New GnuTLS "datum" with the OpenPGP public key
396
datum = gnutls.library.types.gnutls_datum_t\
397
(ctypes.cast(ctypes.c_char_p(openpgp),
398
ctypes.POINTER(ctypes.c_ubyte)),
399
ctypes.c_uint(len(openpgp)))
400
# New empty GnuTLS certificate
401
crt = gnutls.library.types.gnutls_openpgp_crt_t()
402
gnutls.library.functions.gnutls_openpgp_crt_init\
403
(ctypes.byref(crt))
404
# Import the OpenPGP public key into the certificate
405
gnutls.library.functions.gnutls_openpgp_crt_import\
406
(crt, ctypes.byref(datum),
407
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
# New buffer for the fingerprint
409
buffer = ctypes.create_string_buffer(20)
410
buffer_length = ctypes.c_size_t()
411
# Get the fingerprint from the certificate into the buffer
412
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
413
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
414
# Deinit the certificate
415
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
416
# Convert the buffer to a Python bytestring
417
fpr = ctypes.string_at(buffer, buffer_length.value)
418
# Convert the bytestring to hexadecimal notation
419
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
420
return hex_fpr
421
422
423
class tcp_handler(SocketServer.BaseRequestHandler, object):
424
"""A TCP request handler class.
425
Instantiated by IPv6_TCPServer for each request to handle it.
1180
426
Note: This will run in its own forked process."""
1181
427
1182
428
def handle(self):
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
429
logger.info(u"TCP connection from: %s",
430
unicode(self.client_address))
431
session = gnutls.connection.ClientSession\
432
(self.request, gnutls.connection.X509Credentials())
433
434
line = self.request.makefile().readline()
435
logger.debug(u"Protocol version: %r", line)
436
try:
437
if int(line.strip().split()[0]) > 1:
438
raise RuntimeError
439
except (ValueError, IndexError, RuntimeError), error:
440
logger.error(u"Unknown protocol version: %s", error)
441
return
442
443
# Note: gnutls.connection.X509Credentials is really a generic
444
# GnuTLS certificate credentials object so long as no X.509
445
# keys are added to it. Therefore, we can use it here despite
446
# using OpenPGP certificates.
447
448
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
449
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
450
# "+DHE-DSS"))
451
priority = "NORMAL" # Fallback default, since this
452
# MUST be set.
453
if self.server.settings["priority"]:
454
priority = self.server.settings["priority"]
455
gnutls.library.functions.gnutls_priority_set_direct\
456
(session._c_object, priority, None);
457
458
try:
459
session.handshake()
460
except gnutls.errors.GNUTLSError, error:
461
logger.warning(u"Handshake failed: %s", error)
462
# Do not run session.bye() here: the session is not
463
# established. Just abandon the request.
464
return
465
try:
466
fpr = fingerprint(peer_certificate(session))
467
except (TypeError, gnutls.errors.GNUTLSError), error:
468
logger.warning(u"Bad certificate: %s", error)
469
session.bye()
470
return
471
logger.debug(u"Fingerprint: %s", fpr)
472
client = None
473
for c in self.server.clients:
474
if c.fingerprint == fpr:
475
client = c
476
break
477
if not client:
478
logger.warning(u"Client not found for fingerprint: %s",
479
fpr)
480
session.bye()
481
return
482
# Have to check if client.still_valid(), since it is possible
483
# that the client timed out while establishing the GnuTLS
484
# session.
485
if not client.still_valid():
486
logger.warning(u"Client %(name)s is invalid",
487
vars(client))
488
session.bye()
489
return
490
sent_size = 0
491
while sent_size < len(client.secret):
492
sent = session.send(client.secret[sent_size:])
493
logger.debug(u"Sent: %d, remaining: %d",
494
sent, len(client.secret)
495
- (sent_size + sent))
496
sent_size += sent
497
session.bye()
498
499
500
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
501
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1430
502
Attributes:
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
503
settings: Server settings
504
clients: Set() of Client objects
1434
505
"""
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)
506
address_family = socket.AF_INET6
507
def __init__(self, *args, **kwargs):
508
if "settings" in kwargs:
509
self.settings = kwargs["settings"]
510
del kwargs["settings"]
511
if "clients" in kwargs:
512
self.clients = kwargs["clients"]
513
del kwargs["clients"]
514
return super(type(self), self).__init__(*args, **kwargs)
1442
515
def server_bind(self):
1443
516
"""This overrides the normal server_bind() function
1444
517
to bind to an interface if one was specified, and also NOT to
1445
518
bind to an address or port if they were not specified."""
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
519
if self.settings["interface"]:
520
# 25 is from /usr/include/asm-i486/socket.h
521
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
522
try:
523
self.socket.setsockopt(socket.SOL_SOCKET,
524
SO_BINDTODEVICE,
525
self.settings["interface"])
526
except socket.error, error:
527
if error[0] == errno.EPERM:
528
logger.error(u"No permission to"
529
u" bind to interface %s",
530
self.settings["interface"])
531
else:
532
raise error
1468
533
# Only bind(2) the socket if we really need to.
1469
534
if self.server_address[0] or self.server_address[1]:
1470
535
if not self.server_address[0]:
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,
536
in6addr_any = "::"
537
self.server_address = (in6addr_any,
1476
538
self.server_address[1])
1477
539
elif not self.server_address[1]:
1478
540
self.server_address = (self.server_address[0],
1479
541
0)
1480
# if self.interface:
542
# if self.settings["interface"]:
1481
543
# self.server_address = (self.server_address[0],
1482
544
# 0, # port
1483
545
# 0, # flowinfo
1484
546
# if_nametoindex
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
547
# (self.settings
548
# ["interface"]))
549
return super(type(self), self).server_bind()
1593
550
1594
551
1595
552
def string_to_delta(interval):
1596
553
"""Parse a string and return a datetime.timedelta
1597
554
1598
555
>>> string_to_delta('7d')
1599
556
datetime.timedelta(7)
1600
557
>>> string_to_delta('60s')
1603
560
datetime.timedelta(0, 3600)
1604
561
>>> string_to_delta('24h')
1605
562
datetime.timedelta(1)
1606
>>> string_to_delta('1w')
563
>>> string_to_delta(u'1w')
1607
564
datetime.timedelta(7)
1608
>>> string_to_delta('5m 30s')
1609
datetime.timedelta(0, 330)
1610
565
"""
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
566
try:
567
suffix=unicode(interval[-1])
568
value=int(interval[:-1])
569
if suffix == u"d":
570
delta = datetime.timedelta(value)
571
elif suffix == u"s":
572
delta = datetime.timedelta(0, value)
573
elif suffix == u"m":
574
delta = datetime.timedelta(0, 0, 0, 0, value)
575
elif suffix == u"h":
576
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
577
elif suffix == u"w":
578
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
579
else:
580
raise ValueError
581
except (ValueError, IndexError):
582
raise ValueError
583
return delta
584
585
586
def server_state_changed(state):
587
"""Derived from the Avahi example code"""
588
if state == avahi.SERVER_COLLISION:
589
logger.error(u"Server name collision")
590
service.remove()
591
elif state == avahi.SERVER_RUNNING:
592
service.add()
593
594
595
def entry_group_state_changed(state, error):
596
"""Derived from the Avahi example code"""
597
logger.debug(u"state change: %i", state)
598
599
if state == avahi.ENTRY_GROUP_ESTABLISHED:
600
logger.debug(u"Service established.")
601
elif state == avahi.ENTRY_GROUP_COLLISION:
602
logger.warning(u"Service name collision.")
603
service.rename()
604
elif state == avahi.ENTRY_GROUP_FAILURE:
605
logger.critical(u"Error in group state changed %s",
606
unicode(error))
607
raise AvahiGroupError("State changed: %s", str(error))
1633
608
1634
609
def if_nametoindex(interface):
1635
"""Call the C function if_nametoindex(), or equivalent
1636
1637
Note: This function cannot accept a unicode string."""
610
"""Call the C function if_nametoindex(), or equivalent"""
1638
611
global if_nametoindex
1639
612
try:
1640
if_nametoindex = (ctypes.cdll.LoadLibrary
1641
(ctypes.util.find_library("c"))
1642
.if_nametoindex)
613
if "ctypes.util" not in sys.modules:
614
import ctypes.util
615
if_nametoindex = ctypes.cdll.LoadLibrary\
616
(ctypes.util.find_library("c")).if_nametoindex
1643
617
except (OSError, AttributeError):
1644
logger.warning("Doing if_nametoindex the hard way")
618
if "struct" not in sys.modules:
619
import struct
620
if "fcntl" not in sys.modules:
621
import fcntl
1645
622
def if_nametoindex(interface):
1646
623
"Get an interface index the hard way, i.e. using fcntl()"
1647
624
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
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]
625
s = socket.socket()
626
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
627
struct.pack("16s16x", interface))
628
s.close()
629
interface_index = struct.unpack("I", ifreq[16:20])[0]
1654
630
return interface_index
1655
631
return if_nametoindex(interface)
1656
632
1657
633
1658
634
def daemon(nochdir = False, noclose = False):
1659
635
"""See daemon(3). Standard BSD Unix function.
1660
1661
636
This should really exist as os.daemon, but it doesn't (yet)."""
1662
637
if os.fork():
1663
638
sys.exit()
1671
646
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1672
647
if not stat.S_ISCHR(os.fstat(null).st_mode):
1673
648
raise OSError(errno.ENODEV,
1674
"%s not a character device"
1675
% os.path.devnull)
649
"/dev/null not a character device")
1676
650
os.dup2(null, sys.stdin.fileno())
1677
651
os.dup2(null, sys.stdout.fileno())
1678
652
os.dup2(null, sys.stderr.fileno())
1681
655
1682
656
1683
657
def main():
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()
658
global main_loop_started
659
main_loop_started = False
660
661
parser = OptionParser(version = "%%prog %s" % version)
662
parser.add_option("-i", "--interface", type="string",
663
metavar="IF", help="Bind to interface IF")
664
parser.add_option("-a", "--address", type="string",
665
help="Address to listen for requests on")
666
parser.add_option("-p", "--port", type="int",
667
help="Port number to receive requests on")
668
parser.add_option("--check", action="store_true", default=False,
669
help="Run self-test")
670
parser.add_option("--debug", action="store_true",
671
help="Debug mode; run in foreground and log to"
672
" terminal")
673
parser.add_option("--priority", type="string", help="GnuTLS"
674
" priority string (see GnuTLS documentation)")
675
parser.add_option("--servicename", type="string", metavar="NAME",
676
help="Zeroconf service name")
677
parser.add_option("--configdir", type="string",
678
default="/etc/mandos", metavar="DIR",
679
help="Directory to search for configuration"
680
" files")
681
(options, args) = parser.parse_args()
1719
682
1720
683
if options.check:
1721
684
import doctest
1730
693
"priority":
1731
694
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1732
695
"servicename": "Mandos",
1733
"use_dbus": "True",
1734
"use_ipv6": "True",
1735
"debuglevel": "",
1736
696
}
1737
697
1738
698
# Parse config file for server-global settings
1739
server_config = configparser.SafeConfigParser(server_defaults)
699
server_config = ConfigParser.SafeConfigParser(server_defaults)
1740
700
del server_defaults
1741
server_config.read(os.path.join(options.configdir,
1742
"mandos.conf"))
701
server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
server_section = "server"
1743
703
# Convert the SafeConfigParser object to a dict
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")
704
server_settings = dict(server_config.items(server_section))
705
# Use getboolean on the boolean config option
706
server_settings["debug"] = server_config.getboolean\
707
(server_section, "debug")
1752
708
del server_config
1753
709
1754
710
# Override the settings from the config file with command line
1755
711
# options, if set.
1756
712
for option in ("interface", "address", "port", "debug",
1757
"priority", "servicename", "configdir",
1758
"use_dbus", "use_ipv6", "debuglevel"):
713
"priority", "servicename", "configdir"):
1759
714
value = getattr(options, option)
1760
715
if value is not None:
1761
716
server_settings[option] = value
1762
717
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])
1767
718
# Now we have our good server settings in "server_settings"
1768
719
1769
##################################################################
1770
1771
# For convenience
1772
720
debug = server_settings["debug"]
1773
debuglevel = server_settings["debuglevel"]
1774
use_dbus = server_settings["use_dbus"]
1775
use_ipv6 = server_settings["use_ipv6"]
1776
721
722
if not debug:
723
syslogger.setLevel(logging.WARNING)
724
console.setLevel(logging.WARNING)
725
1777
726
if server_settings["servicename"] != "Mandos":
1778
syslogger.setFormatter(logging.Formatter
1779
('Mandos (%s) [%%(process)d]:'
1780
' %%(levelname)s: %%(message)s'
727
syslogger.setFormatter(logging.Formatter\
728
('Mandos (%s): %%(levelname)s:'
729
' %%(message)s'
1781
730
% server_settings["servicename"]))
1782
731
1783
732
# Parse config file with clients
1784
client_defaults = { "timeout": "5m",
1785
"extended_timeout": "15m",
1786
"interval": "2m",
733
client_defaults = { "timeout": "1h",
734
"interval": "5m",
1787
735
"checker": "fping -q -- %%(host)s",
1788
"host": "",
1789
"approval_delay": "0s",
1790
"approval_duration": "1s",
1791
736
}
1792
client_config = configparser.SafeConfigParser(client_defaults)
737
client_config = ConfigParser.SafeConfigParser(client_defaults)
1793
738
client_config.read(os.path.join(server_settings["configdir"],
1794
739
"clients.conf"))
1795
740
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()
741
global service
742
service = AvahiService(name = server_settings["servicename"],
743
type = "_mandos._tcp", );
744
if server_settings["interface"]:
745
service.interface = if_nametoindex(server_settings["interface"])
1871
746
1872
747
global main_loop
748
global bus
749
global server
1873
750
# From the Avahi example code
1874
751
DBusGMainLoop(set_as_default=True )
1875
752
main_loop = gobject.MainLoop()
1876
753
bus = dbus.SystemBus()
754
server = dbus.Interface(
755
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
avahi.DBUS_INTERFACE_SERVER )
1877
757
# End of Avahi example code
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
1921
if not debug:
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
758
759
clients = Set()
760
def remove_from_clients(client):
761
clients.remove(client)
762
if not clients:
763
logger.critical(u"No clients left, exiting")
764
sys.exit()
765
766
clients.update(Set(Client(name = section,
767
stop_hook = remove_from_clients,
768
config
769
= dict(client_config.items(section)))
770
for section in client_config.sections()))
771
if not clients:
772
logger.critical(u"No clients defined")
773
sys.exit(1)
774
775
if not debug:
776
logger.removeHandler(console)
777
daemon()
778
779
pidfilename = "/var/run/mandos/mandos.pid"
780
pid = os.getpid()
781
try:
782
pidfile = open(pidfilename, "w")
783
pidfile.write(str(pid) + "\n")
784
pidfile.close()
785
del pidfile
786
except IOError, err:
787
logger.error(u"Could not write %s file with PID %d",
788
pidfilename, os.getpid())
789
790
def cleanup():
791
"Cleanup function; run on exit"
792
global group
793
# From the Avahi example code
794
if not group is None:
795
group.Free()
796
group = None
797
# End of Avahi example code
798
799
while clients:
800
client = clients.pop()
801
client.stop_hook = None
802
client.stop()
803
804
atexit.register(cleanup)
805
806
if not debug:
1935
807
signal.signal(signal.SIGINT, signal.SIG_IGN)
1936
1937
808
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1938
809
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1939
810
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()
1994
1995
def cleanup():
1996
"Cleanup function; run on exit"
1997
service.cleanup()
1998
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)
2010
2011
atexit.register(cleanup)
2012
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
811
for client in clients:
812
client.start()
813
814
tcp_server = IPv6_TCPServer((server_settings["address"],
815
server_settings["port"]),
816
tcp_handler,
817
settings=server_settings,
818
clients=clients)
2022
819
# Find out what port we got
2023
820
service.port = tcp_server.socket.getsockname()[1]
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())
821
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
u" scope_id %d" % tcp_server.socket.getsockname())
2031
823
2032
824
#service.interface = tcp_server.socket.getsockname()[3]
2033
825
2034
826
try:
2035
827
# From the Avahi example code
828
server.connect_to_signal("StateChanged", server_state_changed)
2036
829
try:
2037
service.activate()
2038
except dbus.exceptions.DBusException as error:
2039
logger.critical("DBusException: %s", error)
2040
cleanup()
830
server_state_changed(server.GetState())
831
except dbus.exceptions.DBusException, error:
832
logger.critical(u"DBusException: %s", error)
2041
833
sys.exit(1)
2042
834
# End of Avahi example code
2043
835
2044
836
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2045
837
lambda *args, **kwargs:
2046
(tcp_server.handle_request
2047
(*args[2:], **kwargs) or True))
838
tcp_server.handle_request\
839
(*args[2:], **kwargs) or True)
2048
840
2049
logger.debug("Starting main loop")
841
logger.debug(u"Starting main loop")
842
main_loop_started = True
2050
843
main_loop.run()
2051
except AvahiError as error:
2052
logger.critical("AvahiError: %s", error)
2053
cleanup()
844
except AvahiError, error:
845
logger.critical(u"AvahiError: %s" + unicode(error))
2054
846
sys.exit(1)
2055
847
except KeyboardInterrupt:
2056
848
if debug:
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()
849
print
2062
850
2063
851
if __name__ == '__main__':
2064
852
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0