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- Committer: Teddy Hogeborn
- Date: 2011-02-27 16:56:09 UTC
- mto: This revision was merged to the branch mainline in revision 465.
- Revision ID: teddy@fukt.bsnet.se-20110227165609-2uij9a5ytirpxq0n
* debian/control (mandos): Depend on Python 2.6. Do not depend on
python-multiprocessing.
(mandos-client): Conflict with dropbear (< 0.52-5); Debian bug
#584780.
python-multiprocessing.
(mandos-client): Conflict with dropbear (< 0.52-5); Debian bug
#584780.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
mandos
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add" and "remove" in the "AvahiService" class, the
10
# "server_state_changed" and "entry_group_state_changed" functions,
11
# and some lines in "main".
9
# methods "add", "remove", "server_state_changed",
10
# "entry_group_state_changed", "cleanup", and "activate" in the
11
# "AvahiService" class, and some lines in "main".
12
12
#
13
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
# Copyright © 2008-2010 Teddy Hogeborn
15
# Copyright © 2008-2010 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 optparse
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 = "1.2.3"
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
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
122
154
def rename(self):
123
155
"""Derived from the Avahi example code"""
124
156
if self.rename_count >= self.max_renames:
125
logger.critical(u"No suitable service name found after %i"
126
u" retries, exiting.", rename_count)
157
logger.critical("No suitable Zeroconf service name found"
158
" after %i retries, exiting.",
159
self.rename_count)
127
160
raise AvahiServiceError("Too many renames")
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))
161
self.name = unicode(self.server.GetAlternativeServiceName(self.name))
162
logger.info("Changing Zeroconf service name to %r ...",
163
self.name)
164
syslogger.setFormatter(logging.Formatter
165
('Mandos (%s) [%%(process)d]:'
166
' %%(levelname)s: %%(message)s'
167
% self.name))
133
168
self.remove()
134
self.add()
169
try:
170
self.add()
171
except dbus.exceptions.DBusException, error:
172
logger.critical("DBusException: %s", error)
173
self.cleanup()
174
os._exit(1)
135
175
self.rename_count += 1
136
176
def remove(self):
137
177
"""Derived from the Avahi example code"""
138
if group is not None:
139
group.Reset()
178
if self.group is not None:
179
self.group.Reset()
140
180
def add(self):
141
181
"""Derived from the Avahi example code"""
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
182
if self.group is None:
183
self.group = dbus.Interface(
184
self.bus.get_object(avahi.DBUS_NAME,
185
self.server.EntryGroupNew()),
186
avahi.DBUS_INTERFACE_ENTRY_GROUP)
187
self.group.connect_to_signal('StateChanged',
188
self
189
.entry_group_state_changed)
190
logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
191
self.name, self.type)
192
self.group.AddService(
193
self.interface,
194
self.protocol,
195
dbus.UInt32(0), # flags
196
self.name, self.type,
197
self.domain, self.host,
198
dbus.UInt16(self.port),
199
avahi.string_array_to_txt_array(self.TXT))
200
self.group.Commit()
201
def entry_group_state_changed(self, state, error):
202
"""Derived from the Avahi example code"""
203
logger.debug("Avahi entry group state change: %i", state)
204
205
if state == avahi.ENTRY_GROUP_ESTABLISHED:
206
logger.debug("Zeroconf service established.")
207
elif state == avahi.ENTRY_GROUP_COLLISION:
208
logger.info("Zeroconf service name collision.")
209
self.rename()
210
elif state == avahi.ENTRY_GROUP_FAILURE:
211
logger.critical("Avahi: Error in group state changed %s",
212
unicode(error))
213
raise AvahiGroupError("State changed: %s"
214
% unicode(error))
215
def cleanup(self):
216
"""Derived from the Avahi example code"""
217
if self.group is not None:
218
self.group.Free()
219
self.group = None
220
def server_state_changed(self, state):
221
"""Derived from the Avahi example code"""
222
logger.debug("Avahi server state change: %i", state)
223
if state == avahi.SERVER_COLLISION:
224
logger.error("Zeroconf server name collision")
225
self.remove()
226
elif state == avahi.SERVER_RUNNING:
227
self.add()
228
def activate(self):
229
"""Derived from the Avahi example code"""
230
if self.server is None:
231
self.server = dbus.Interface(
232
self.bus.get_object(avahi.DBUS_NAME,
233
avahi.DBUS_PATH_SERVER),
234
avahi.DBUS_INTERFACE_SERVER)
235
self.server.connect_to_signal("StateChanged",
236
self.server_state_changed)
237
self.server_state_changed(self.server.GetState())
165
238
166
239
167
240
class Client(object):
168
241
"""A representation of a client host served by this server.
242
169
243
Attributes:
170
name: string; from the config file, used in log messages
244
_approved: bool(); 'None' if not yet approved/disapproved
245
approval_delay: datetime.timedelta(); Time to wait for approval
246
approval_duration: datetime.timedelta(); Duration of one approval
247
checker: subprocess.Popen(); a running checker process used
248
to see if the client lives.
249
'None' if no process is running.
250
checker_callback_tag: a gobject event source tag, or None
251
checker_command: string; External command which is run to check
252
if client lives. %() expansions are done at
253
runtime with vars(self) as dict, so that for
254
instance %(name)s can be used in the command.
255
checker_initiator_tag: a gobject event source tag, or None
256
created: datetime.datetime(); (UTC) object creation
257
current_checker_command: string; current running checker_command
258
disable_hook: If set, called by disable() as disable_hook(self)
259
disable_initiator_tag: a gobject event source tag, or None
260
enabled: bool()
171
261
fingerprint: string (40 or 32 hexadecimal digits); used to
172
262
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
189
runtime with vars(self) as dict, so that for
190
instance %(name)s can be used in the command.
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: - '' -
263
host: string; available for use by the checker command
264
interval: datetime.timedelta(); How often to start a new checker
265
last_approval_request: datetime.datetime(); (UTC) or None
266
last_checked_ok: datetime.datetime(); (UTC) or None
267
last_enabled: datetime.datetime(); (UTC)
268
name: string; from the config file, used in log messages and
269
D-Bus identifiers
270
secret: bytestring; sent verbatim (over TLS) to client
271
timeout: datetime.timedelta(); How long from last_checked_ok
272
until this client is disabled
273
runtime_expansions: Allowed attributes for runtime expansion.
196
274
"""
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={}):
275
276
runtime_expansions = ("approval_delay", "approval_duration",
277
"created", "enabled", "fingerprint",
278
"host", "interval", "last_checked_ok",
279
"last_enabled", "name", "timeout")
280
281
@staticmethod
282
def _timedelta_to_milliseconds(td):
283
"Convert a datetime.timedelta() to milliseconds"
284
return ((td.days * 24 * 60 * 60 * 1000)
285
+ (td.seconds * 1000)
286
+ (td.microseconds // 1000))
287
288
def timeout_milliseconds(self):
289
"Return the 'timeout' attribute in milliseconds"
290
return self._timedelta_to_milliseconds(self.timeout)
291
292
def interval_milliseconds(self):
293
"Return the 'interval' attribute in milliseconds"
294
return self._timedelta_to_milliseconds(self.interval)
295
296
def approval_delay_milliseconds(self):
297
return self._timedelta_to_milliseconds(self.approval_delay)
298
299
def __init__(self, name = None, disable_hook=None, config=None):
221
300
"""Note: the 'checker' key in 'config' sets the
222
301
'checker_command' attribute and *not* the 'checker'
223
302
attribute."""
224
303
self.name = name
225
logger.debug(u"Creating client %r", self.name)
304
if config is None:
305
config = {}
306
logger.debug("Creating client %r", self.name)
226
307
# Uppercase and remove spaces from fingerprint for later
227
308
# comparison purposes with return value from the fingerprint()
228
309
# function
229
self.fingerprint = config["fingerprint"].upper()\
230
.replace(u" ", u"")
231
logger.debug(u" Fingerprint: %s", self.fingerprint)
310
self.fingerprint = (config["fingerprint"].upper()
311
.replace(" ", ""))
312
logger.debug(" Fingerprint: %s", self.fingerprint)
232
313
if "secret" in config:
233
self.secret = config["secret"].decode(u"base64")
314
self.secret = config["secret"].decode("base64")
234
315
elif "secfile" in config:
235
sf = open(config["secfile"])
236
self.secret = sf.read()
237
sf.close()
316
with open(os.path.expanduser(os.path.expandvars
317
(config["secfile"])),
318
"rb") as secfile:
319
self.secret = secfile.read()
238
320
else:
239
raise TypeError(u"No secret or secfile for client %s"
321
raise TypeError("No secret or secfile for client %s"
240
322
% self.name)
241
323
self.host = config.get("host", "")
242
self.created = datetime.datetime.now()
324
self.created = datetime.datetime.utcnow()
325
self.enabled = False
326
self.last_approval_request = None
327
self.last_enabled = None
243
328
self.last_checked_ok = None
244
329
self.timeout = string_to_delta(config["timeout"])
245
330
self.interval = string_to_delta(config["interval"])
246
self.stop_hook = stop_hook
331
self.disable_hook = disable_hook
247
332
self.checker = None
248
333
self.checker_initiator_tag = None
249
self.stop_initiator_tag = None
334
self.disable_initiator_tag = None
250
335
self.checker_callback_tag = None
251
self.check_command = config["checker"]
252
def start(self):
336
self.checker_command = config["checker"]
337
self.current_checker_command = None
338
self.last_connect = None
339
self._approved = None
340
self.approved_by_default = config.get("approved_by_default",
341
True)
342
self.approvals_pending = 0
343
self.approval_delay = string_to_delta(
344
config["approval_delay"])
345
self.approval_duration = string_to_delta(
346
config["approval_duration"])
347
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
348
349
def send_changedstate(self):
350
self.changedstate.acquire()
351
self.changedstate.notify_all()
352
self.changedstate.release()
353
354
def enable(self):
253
355
"""Start this client's checker and timeout hooks"""
356
if getattr(self, "enabled", False):
357
# Already enabled
358
return
359
self.send_changedstate()
360
self.last_enabled = datetime.datetime.utcnow()
254
361
# Schedule a new checker to be started an 'interval' from now,
255
362
# and every interval from then on.
256
self.checker_initiator_tag = gobject.timeout_add\
257
(self._interval_milliseconds,
258
self.start_checker)
363
self.checker_initiator_tag = (gobject.timeout_add
364
(self.interval_milliseconds(),
365
self.start_checker))
366
# Schedule a disable() when 'timeout' has passed
367
self.disable_initiator_tag = (gobject.timeout_add
368
(self.timeout_milliseconds(),
369
self.disable))
370
self.enabled = True
259
371
# Also start a new checker *right now*.
260
372
self.start_checker()
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:
373
374
def disable(self, quiet=True):
375
"""Disable this client."""
376
if not getattr(self, "enabled", False):
274
377
return False
275
if getattr(self, "stop_initiator_tag", False):
276
gobject.source_remove(self.stop_initiator_tag)
277
self.stop_initiator_tag = None
378
if not quiet:
379
self.send_changedstate()
380
if not quiet:
381
logger.info("Disabling client %s", self.name)
382
if getattr(self, "disable_initiator_tag", False):
383
gobject.source_remove(self.disable_initiator_tag)
384
self.disable_initiator_tag = None
278
385
if getattr(self, "checker_initiator_tag", False):
279
386
gobject.source_remove(self.checker_initiator_tag)
280
387
self.checker_initiator_tag = None
281
388
self.stop_checker()
282
if self.stop_hook:
283
self.stop_hook(self)
389
if self.disable_hook:
390
self.disable_hook(self)
391
self.enabled = False
284
392
# Do not run this again if called by a gobject.timeout_add
285
393
return False
394
286
395
def __del__(self):
287
self.stop_hook = None
288
self.stop()
289
def checker_callback(self, pid, condition):
396
self.disable_hook = None
397
self.disable()
398
399
def checker_callback(self, pid, condition, command):
290
400
"""The checker has completed, so take appropriate actions."""
291
now = datetime.datetime.now()
292
401
self.checker_callback_tag = None
293
402
self.checker = None
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?",
403
if os.WIFEXITED(condition):
404
exitstatus = os.WEXITSTATUS(condition)
405
if exitstatus == 0:
406
logger.info("Checker for %(name)s succeeded",
407
vars(self))
408
self.checked_ok()
409
else:
410
logger.info("Checker for %(name)s failed",
411
vars(self))
412
else:
413
logger.warning("Checker for %(name)s crashed?",
305
414
vars(self))
306
else:
307
logger.info(u"Checker for %(name)s failed",
308
vars(self))
415
416
def checked_ok(self):
417
"""Bump up the timeout for this client.
418
419
This should only be called when the client has been seen,
420
alive and well.
421
"""
422
self.last_checked_ok = datetime.datetime.utcnow()
423
gobject.source_remove(self.disable_initiator_tag)
424
self.disable_initiator_tag = (gobject.timeout_add
425
(self.timeout_milliseconds(),
426
self.disable))
427
428
def need_approval(self):
429
self.last_approval_request = datetime.datetime.utcnow()
430
309
431
def start_checker(self):
310
432
"""Start a new checker subprocess if one is not running.
433
311
434
If a checker already exists, leave it running and do
312
435
nothing."""
313
436
# The reason for not killing a running checker is that if we
316
439
# client would inevitably timeout, since no checker would get
317
440
# a chance to run to completion. If we instead leave running
318
441
# checkers alone, the checker would have to take more time
319
# than 'timeout' for the client to be declared invalid, which
320
# is as it should be.
442
# than 'timeout' for the client to be disabled, which is as it
443
# should be.
444
445
# If a checker exists, make sure it is not a zombie
446
try:
447
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
448
except (AttributeError, OSError), error:
449
if (isinstance(error, OSError)
450
and error.errno != errno.ECHILD):
451
raise error
452
else:
453
if pid:
454
logger.warning("Checker was a zombie")
455
gobject.source_remove(self.checker_callback_tag)
456
self.checker_callback(pid, status,
457
self.current_checker_command)
458
# Start a new checker if needed
321
459
if self.checker is None:
322
460
try:
323
# In case check_command has exactly one % operator
324
command = self.check_command % self.host
461
# In case checker_command has exactly one % operator
462
command = self.checker_command % self.host
325
463
except TypeError:
326
464
# Escape attributes for the shell
327
escaped_attrs = dict((key, re.escape(str(val)))
328
for key, val in
329
vars(self).iteritems())
465
escaped_attrs = dict(
466
(attr,
467
re.escape(unicode(str(getattr(self, attr, "")),
468
errors=
469
'replace')))
470
for attr in
471
self.runtime_expansions)
472
330
473
try:
331
command = self.check_command % escaped_attrs
474
command = self.checker_command % escaped_attrs
332
475
except TypeError, error:
333
logger.error(u'Could not format string "%s":'
334
u' %s', self.check_command, error)
476
logger.error('Could not format string "%s":'
477
' %s', self.checker_command, error)
335
478
return True # Try again later
479
self.current_checker_command = command
336
480
try:
337
logger.info(u"Starting checker %r for %s",
481
logger.info("Starting checker %r for %s",
338
482
command, self.name)
483
# We don't need to redirect stdout and stderr, since
484
# in normal mode, that is already done by daemon(),
485
# and in debug mode we don't want to. (Stdin is
486
# always replaced by /dev/null.)
339
487
self.checker = subprocess.Popen(command,
340
488
close_fds=True,
341
489
shell=True, cwd="/")
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",
490
self.checker_callback_tag = (gobject.child_watch_add
491
(self.checker.pid,
492
self.checker_callback,
493
data=command))
494
# The checker may have completed before the gobject
495
# watch was added. Check for this.
496
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
497
if pid:
498
gobject.source_remove(self.checker_callback_tag)
499
self.checker_callback(pid, status, command)
500
except OSError, error:
501
logger.error("Failed to start subprocess: %s",
347
502
error)
348
503
# Re-run this periodically if run by gobject.timeout_add
349
504
return True
505
350
506
def stop_checker(self):
351
507
"""Force the checker process, if any, to stop."""
352
508
if self.checker_callback_tag:
354
510
self.checker_callback_tag = None
355
511
if getattr(self, "checker", None) is None:
356
512
return
357
logger.debug(u"Stopping checker for %(name)s", vars(self))
513
logger.debug("Stopping checker for %(name)s", vars(self))
358
514
try:
359
515
os.kill(self.checker.pid, signal.SIGTERM)
360
#os.sleep(0.5)
516
#time.sleep(0.5)
361
517
#if self.checker.poll() is None:
362
518
# os.kill(self.checker.pid, signal.SIGKILL)
363
519
except OSError, error:
364
520
if error.errno != errno.ESRCH: # No such process
365
521
raise
366
522
self.checker = None
367
def still_valid(self):
368
"""Has the timeout not yet passed for this client?"""
369
now = datetime.datetime.now()
523
524
def dbus_service_property(dbus_interface, signature="v",
525
access="readwrite", byte_arrays=False):
526
"""Decorators for marking methods of a DBusObjectWithProperties to
527
become properties on the D-Bus.
528
529
The decorated method will be called with no arguments by "Get"
530
and with one argument by "Set".
531
532
The parameters, where they are supported, are the same as
533
dbus.service.method, except there is only "signature", since the
534
type from Get() and the type sent to Set() is the same.
535
"""
536
# Encoding deeply encoded byte arrays is not supported yet by the
537
# "Set" method, so we fail early here:
538
if byte_arrays and signature != "ay":
539
raise ValueError("Byte arrays not supported for non-'ay'"
540
" signature %r" % signature)
541
def decorator(func):
542
func._dbus_is_property = True
543
func._dbus_interface = dbus_interface
544
func._dbus_signature = signature
545
func._dbus_access = access
546
func._dbus_name = func.__name__
547
if func._dbus_name.endswith("_dbus_property"):
548
func._dbus_name = func._dbus_name[:-14]
549
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
550
return func
551
return decorator
552
553
554
class DBusPropertyException(dbus.exceptions.DBusException):
555
"""A base class for D-Bus property-related exceptions
556
"""
557
def __unicode__(self):
558
return unicode(str(self))
559
560
561
class DBusPropertyAccessException(DBusPropertyException):
562
"""A property's access permissions disallows an operation.
563
"""
564
pass
565
566
567
class DBusPropertyNotFound(DBusPropertyException):
568
"""An attempt was made to access a non-existing property.
569
"""
570
pass
571
572
573
class DBusObjectWithProperties(dbus.service.Object):
574
"""A D-Bus object with properties.
575
576
Classes inheriting from this can use the dbus_service_property
577
decorator to expose methods as D-Bus properties. It exposes the
578
standard Get(), Set(), and GetAll() methods on the D-Bus.
579
"""
580
581
@staticmethod
582
def _is_dbus_property(obj):
583
return getattr(obj, "_dbus_is_property", False)
584
585
def _get_all_dbus_properties(self):
586
"""Returns a generator of (name, attribute) pairs
587
"""
588
return ((prop._dbus_name, prop)
589
for name, prop in
590
inspect.getmembers(self, self._is_dbus_property))
591
592
def _get_dbus_property(self, interface_name, property_name):
593
"""Returns a bound method if one exists which is a D-Bus
594
property with the specified name and interface.
595
"""
596
for name in (property_name,
597
property_name + "_dbus_property"):
598
prop = getattr(self, name, None)
599
if (prop is None
600
or not self._is_dbus_property(prop)
601
or prop._dbus_name != property_name
602
or (interface_name and prop._dbus_interface
603
and interface_name != prop._dbus_interface)):
604
continue
605
return prop
606
# No such property
607
raise DBusPropertyNotFound(self.dbus_object_path + ":"
608
+ interface_name + "."
609
+ property_name)
610
611
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
612
out_signature="v")
613
def Get(self, interface_name, property_name):
614
"""Standard D-Bus property Get() method, see D-Bus standard.
615
"""
616
prop = self._get_dbus_property(interface_name, property_name)
617
if prop._dbus_access == "write":
618
raise DBusPropertyAccessException(property_name)
619
value = prop()
620
if not hasattr(value, "variant_level"):
621
return value
622
return type(value)(value, variant_level=value.variant_level+1)
623
624
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
625
def Set(self, interface_name, property_name, value):
626
"""Standard D-Bus property Set() method, see D-Bus standard.
627
"""
628
prop = self._get_dbus_property(interface_name, property_name)
629
if prop._dbus_access == "read":
630
raise DBusPropertyAccessException(property_name)
631
if prop._dbus_get_args_options["byte_arrays"]:
632
# The byte_arrays option is not supported yet on
633
# signatures other than "ay".
634
if prop._dbus_signature != "ay":
635
raise ValueError
636
value = dbus.ByteArray(''.join(unichr(byte)
637
for byte in value))
638
prop(value)
639
640
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
641
out_signature="a{sv}")
642
def GetAll(self, interface_name):
643
"""Standard D-Bus property GetAll() method, see D-Bus
644
standard.
645
646
Note: Will not include properties with access="write".
647
"""
648
all = {}
649
for name, prop in self._get_all_dbus_properties():
650
if (interface_name
651
and interface_name != prop._dbus_interface):
652
# Interface non-empty but did not match
653
continue
654
# Ignore write-only properties
655
if prop._dbus_access == "write":
656
continue
657
value = prop()
658
if not hasattr(value, "variant_level"):
659
all[name] = value
660
continue
661
all[name] = type(value)(value, variant_level=
662
value.variant_level+1)
663
return dbus.Dictionary(all, signature="sv")
664
665
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
666
out_signature="s",
667
path_keyword='object_path',
668
connection_keyword='connection')
669
def Introspect(self, object_path, connection):
670
"""Standard D-Bus method, overloaded to insert property tags.
671
"""
672
xmlstring = dbus.service.Object.Introspect(self, object_path,
673
connection)
674
try:
675
document = xml.dom.minidom.parseString(xmlstring)
676
def make_tag(document, name, prop):
677
e = document.createElement("property")
678
e.setAttribute("name", name)
679
e.setAttribute("type", prop._dbus_signature)
680
e.setAttribute("access", prop._dbus_access)
681
return e
682
for if_tag in document.getElementsByTagName("interface"):
683
for tag in (make_tag(document, name, prop)
684
for name, prop
685
in self._get_all_dbus_properties()
686
if prop._dbus_interface
687
== if_tag.getAttribute("name")):
688
if_tag.appendChild(tag)
689
# Add the names to the return values for the
690
# "org.freedesktop.DBus.Properties" methods
691
if (if_tag.getAttribute("name")
692
== "org.freedesktop.DBus.Properties"):
693
for cn in if_tag.getElementsByTagName("method"):
694
if cn.getAttribute("name") == "Get":
695
for arg in cn.getElementsByTagName("arg"):
696
if (arg.getAttribute("direction")
697
== "out"):
698
arg.setAttribute("name", "value")
699
elif cn.getAttribute("name") == "GetAll":
700
for arg in cn.getElementsByTagName("arg"):
701
if (arg.getAttribute("direction")
702
== "out"):
703
arg.setAttribute("name", "props")
704
xmlstring = document.toxml("utf-8")
705
document.unlink()
706
except (AttributeError, xml.dom.DOMException,
707
xml.parsers.expat.ExpatError), error:
708
logger.error("Failed to override Introspection method",
709
error)
710
return xmlstring
711
712
713
class ClientDBus(Client, DBusObjectWithProperties):
714
"""A Client class using D-Bus
715
716
Attributes:
717
dbus_object_path: dbus.ObjectPath
718
bus: dbus.SystemBus()
719
"""
720
721
runtime_expansions = (Client.runtime_expansions
722
+ ("dbus_object_path",))
723
724
# dbus.service.Object doesn't use super(), so we can't either.
725
726
def __init__(self, bus = None, *args, **kwargs):
727
self._approvals_pending = 0
728
self.bus = bus
729
Client.__init__(self, *args, **kwargs)
730
# Only now, when this client is initialized, can it show up on
731
# the D-Bus
732
client_object_name = unicode(self.name).translate(
733
{ord("."): ord("_"),
734
ord("-"): ord("_")})
735
self.dbus_object_path = (dbus.ObjectPath
736
("/clients/" + client_object_name))
737
DBusObjectWithProperties.__init__(self, self.bus,
738
self.dbus_object_path)
739
740
def _get_approvals_pending(self):
741
return self._approvals_pending
742
def _set_approvals_pending(self, value):
743
old_value = self._approvals_pending
744
self._approvals_pending = value
745
bval = bool(value)
746
if (hasattr(self, "dbus_object_path")
747
and bval is not bool(old_value)):
748
dbus_bool = dbus.Boolean(bval, variant_level=1)
749
self.PropertyChanged(dbus.String("ApprovalPending"),
750
dbus_bool)
751
752
approvals_pending = property(_get_approvals_pending,
753
_set_approvals_pending)
754
del _get_approvals_pending, _set_approvals_pending
755
756
@staticmethod
757
def _datetime_to_dbus(dt, variant_level=0):
758
"""Convert a UTC datetime.datetime() to a D-Bus type."""
759
return dbus.String(dt.isoformat(),
760
variant_level=variant_level)
761
762
def enable(self):
763
oldstate = getattr(self, "enabled", False)
764
r = Client.enable(self)
765
if oldstate != self.enabled:
766
# Emit D-Bus signals
767
self.PropertyChanged(dbus.String("Enabled"),
768
dbus.Boolean(True, variant_level=1))
769
self.PropertyChanged(
770
dbus.String("LastEnabled"),
771
self._datetime_to_dbus(self.last_enabled,
772
variant_level=1))
773
return r
774
775
def disable(self, quiet = False):
776
oldstate = getattr(self, "enabled", False)
777
r = Client.disable(self, quiet=quiet)
778
if not quiet and oldstate != self.enabled:
779
# Emit D-Bus signal
780
self.PropertyChanged(dbus.String("Enabled"),
781
dbus.Boolean(False, variant_level=1))
782
return r
783
784
def __del__(self, *args, **kwargs):
785
try:
786
self.remove_from_connection()
787
except LookupError:
788
pass
789
if hasattr(DBusObjectWithProperties, "__del__"):
790
DBusObjectWithProperties.__del__(self, *args, **kwargs)
791
Client.__del__(self, *args, **kwargs)
792
793
def checker_callback(self, pid, condition, command,
794
*args, **kwargs):
795
self.checker_callback_tag = None
796
self.checker = None
797
# Emit D-Bus signal
798
self.PropertyChanged(dbus.String("CheckerRunning"),
799
dbus.Boolean(False, variant_level=1))
800
if os.WIFEXITED(condition):
801
exitstatus = os.WEXITSTATUS(condition)
802
# Emit D-Bus signal
803
self.CheckerCompleted(dbus.Int16(exitstatus),
804
dbus.Int64(condition),
805
dbus.String(command))
806
else:
807
# Emit D-Bus signal
808
self.CheckerCompleted(dbus.Int16(-1),
809
dbus.Int64(condition),
810
dbus.String(command))
811
812
return Client.checker_callback(self, pid, condition, command,
813
*args, **kwargs)
814
815
def checked_ok(self, *args, **kwargs):
816
r = Client.checked_ok(self, *args, **kwargs)
817
# Emit D-Bus signal
818
self.PropertyChanged(
819
dbus.String("LastCheckedOK"),
820
(self._datetime_to_dbus(self.last_checked_ok,
821
variant_level=1)))
822
return r
823
824
def need_approval(self, *args, **kwargs):
825
r = Client.need_approval(self, *args, **kwargs)
826
# Emit D-Bus signal
827
self.PropertyChanged(
828
dbus.String("LastApprovalRequest"),
829
(self._datetime_to_dbus(self.last_approval_request,
830
variant_level=1)))
831
return r
832
833
def start_checker(self, *args, **kwargs):
834
old_checker = self.checker
835
if self.checker is not None:
836
old_checker_pid = self.checker.pid
837
else:
838
old_checker_pid = None
839
r = Client.start_checker(self, *args, **kwargs)
840
# Only if new checker process was started
841
if (self.checker is not None
842
and old_checker_pid != self.checker.pid):
843
# Emit D-Bus signal
844
self.CheckerStarted(self.current_checker_command)
845
self.PropertyChanged(
846
dbus.String("CheckerRunning"),
847
dbus.Boolean(True, variant_level=1))
848
return r
849
850
def stop_checker(self, *args, **kwargs):
851
old_checker = getattr(self, "checker", None)
852
r = Client.stop_checker(self, *args, **kwargs)
853
if (old_checker is not None
854
and getattr(self, "checker", None) is None):
855
self.PropertyChanged(dbus.String("CheckerRunning"),
856
dbus.Boolean(False, variant_level=1))
857
return r
858
859
def _reset_approved(self):
860
self._approved = None
861
return False
862
863
def approve(self, value=True):
864
self.send_changedstate()
865
self._approved = value
866
gobject.timeout_add(self._timedelta_to_milliseconds
867
(self.approval_duration),
868
self._reset_approved)
869
870
871
## D-Bus methods, signals & properties
872
_interface = "se.bsnet.fukt.Mandos.Client"
873
874
## Signals
875
876
# CheckerCompleted - signal
877
@dbus.service.signal(_interface, signature="nxs")
878
def CheckerCompleted(self, exitcode, waitstatus, command):
879
"D-Bus signal"
880
pass
881
882
# CheckerStarted - signal
883
@dbus.service.signal(_interface, signature="s")
884
def CheckerStarted(self, command):
885
"D-Bus signal"
886
pass
887
888
# PropertyChanged - signal
889
@dbus.service.signal(_interface, signature="sv")
890
def PropertyChanged(self, property, value):
891
"D-Bus signal"
892
pass
893
894
# GotSecret - signal
895
@dbus.service.signal(_interface)
896
def GotSecret(self):
897
"""D-Bus signal
898
Is sent after a successful transfer of secret from the Mandos
899
server to mandos-client
900
"""
901
pass
902
903
# Rejected - signal
904
@dbus.service.signal(_interface, signature="s")
905
def Rejected(self, reason):
906
"D-Bus signal"
907
pass
908
909
# NeedApproval - signal
910
@dbus.service.signal(_interface, signature="tb")
911
def NeedApproval(self, timeout, default):
912
"D-Bus signal"
913
return self.need_approval()
914
915
## Methods
916
917
# Approve - method
918
@dbus.service.method(_interface, in_signature="b")
919
def Approve(self, value):
920
self.approve(value)
921
922
# CheckedOK - method
923
@dbus.service.method(_interface)
924
def CheckedOK(self):
925
return self.checked_ok()
926
927
# Enable - method
928
@dbus.service.method(_interface)
929
def Enable(self):
930
"D-Bus method"
931
self.enable()
932
933
# StartChecker - method
934
@dbus.service.method(_interface)
935
def StartChecker(self):
936
"D-Bus method"
937
self.start_checker()
938
939
# Disable - method
940
@dbus.service.method(_interface)
941
def Disable(self):
942
"D-Bus method"
943
self.disable()
944
945
# StopChecker - method
946
@dbus.service.method(_interface)
947
def StopChecker(self):
948
self.stop_checker()
949
950
## Properties
951
952
# ApprovalPending - property
953
@dbus_service_property(_interface, signature="b", access="read")
954
def ApprovalPending_dbus_property(self):
955
return dbus.Boolean(bool(self.approvals_pending))
956
957
# ApprovedByDefault - property
958
@dbus_service_property(_interface, signature="b",
959
access="readwrite")
960
def ApprovedByDefault_dbus_property(self, value=None):
961
if value is None: # get
962
return dbus.Boolean(self.approved_by_default)
963
self.approved_by_default = bool(value)
964
# Emit D-Bus signal
965
self.PropertyChanged(dbus.String("ApprovedByDefault"),
966
dbus.Boolean(value, variant_level=1))
967
968
# ApprovalDelay - property
969
@dbus_service_property(_interface, signature="t",
970
access="readwrite")
971
def ApprovalDelay_dbus_property(self, value=None):
972
if value is None: # get
973
return dbus.UInt64(self.approval_delay_milliseconds())
974
self.approval_delay = datetime.timedelta(0, 0, 0, value)
975
# Emit D-Bus signal
976
self.PropertyChanged(dbus.String("ApprovalDelay"),
977
dbus.UInt64(value, variant_level=1))
978
979
# ApprovalDuration - property
980
@dbus_service_property(_interface, signature="t",
981
access="readwrite")
982
def ApprovalDuration_dbus_property(self, value=None):
983
if value is None: # get
984
return dbus.UInt64(self._timedelta_to_milliseconds(
985
self.approval_duration))
986
self.approval_duration = datetime.timedelta(0, 0, 0, value)
987
# Emit D-Bus signal
988
self.PropertyChanged(dbus.String("ApprovalDuration"),
989
dbus.UInt64(value, variant_level=1))
990
991
# Name - property
992
@dbus_service_property(_interface, signature="s", access="read")
993
def Name_dbus_property(self):
994
return dbus.String(self.name)
995
996
# Fingerprint - property
997
@dbus_service_property(_interface, signature="s", access="read")
998
def Fingerprint_dbus_property(self):
999
return dbus.String(self.fingerprint)
1000
1001
# Host - property
1002
@dbus_service_property(_interface, signature="s",
1003
access="readwrite")
1004
def Host_dbus_property(self, value=None):
1005
if value is None: # get
1006
return dbus.String(self.host)
1007
self.host = value
1008
# Emit D-Bus signal
1009
self.PropertyChanged(dbus.String("Host"),
1010
dbus.String(value, variant_level=1))
1011
1012
# Created - property
1013
@dbus_service_property(_interface, signature="s", access="read")
1014
def Created_dbus_property(self):
1015
return dbus.String(self._datetime_to_dbus(self.created))
1016
1017
# LastEnabled - property
1018
@dbus_service_property(_interface, signature="s", access="read")
1019
def LastEnabled_dbus_property(self):
1020
if self.last_enabled is None:
1021
return dbus.String("")
1022
return dbus.String(self._datetime_to_dbus(self.last_enabled))
1023
1024
# Enabled - property
1025
@dbus_service_property(_interface, signature="b",
1026
access="readwrite")
1027
def Enabled_dbus_property(self, value=None):
1028
if value is None: # get
1029
return dbus.Boolean(self.enabled)
1030
if value:
1031
self.enable()
1032
else:
1033
self.disable()
1034
1035
# LastCheckedOK - property
1036
@dbus_service_property(_interface, signature="s",
1037
access="readwrite")
1038
def LastCheckedOK_dbus_property(self, value=None):
1039
if value is not None:
1040
self.checked_ok()
1041
return
370
1042
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.
1043
return dbus.String("")
1044
return dbus.String(self._datetime_to_dbus(self
1045
.last_checked_ok))
1046
1047
# LastApprovalRequest - property
1048
@dbus_service_property(_interface, signature="s", access="read")
1049
def LastApprovalRequest_dbus_property(self):
1050
if self.last_approval_request is None:
1051
return dbus.String("")
1052
return dbus.String(self.
1053
_datetime_to_dbus(self
1054
.last_approval_request))
1055
1056
# Timeout - property
1057
@dbus_service_property(_interface, signature="t",
1058
access="readwrite")
1059
def Timeout_dbus_property(self, value=None):
1060
if value is None: # get
1061
return dbus.UInt64(self.timeout_milliseconds())
1062
self.timeout = datetime.timedelta(0, 0, 0, value)
1063
# Emit D-Bus signal
1064
self.PropertyChanged(dbus.String("Timeout"),
1065
dbus.UInt64(value, variant_level=1))
1066
if getattr(self, "disable_initiator_tag", None) is None:
1067
return
1068
# Reschedule timeout
1069
gobject.source_remove(self.disable_initiator_tag)
1070
self.disable_initiator_tag = None
1071
time_to_die = (self.
1072
_timedelta_to_milliseconds((self
1073
.last_checked_ok
1074
+ self.timeout)
1075
- datetime.datetime
1076
.utcnow()))
1077
if time_to_die <= 0:
1078
# The timeout has passed
1079
self.disable()
1080
else:
1081
self.disable_initiator_tag = (gobject.timeout_add
1082
(time_to_die, self.disable))
1083
1084
# Interval - property
1085
@dbus_service_property(_interface, signature="t",
1086
access="readwrite")
1087
def Interval_dbus_property(self, value=None):
1088
if value is None: # get
1089
return dbus.UInt64(self.interval_milliseconds())
1090
self.interval = datetime.timedelta(0, 0, 0, value)
1091
# Emit D-Bus signal
1092
self.PropertyChanged(dbus.String("Interval"),
1093
dbus.UInt64(value, variant_level=1))
1094
if getattr(self, "checker_initiator_tag", None) is None:
1095
return
1096
# Reschedule checker run
1097
gobject.source_remove(self.checker_initiator_tag)
1098
self.checker_initiator_tag = (gobject.timeout_add
1099
(value, self.start_checker))
1100
self.start_checker() # Start one now, too
1101
1102
# Checker - property
1103
@dbus_service_property(_interface, signature="s",
1104
access="readwrite")
1105
def Checker_dbus_property(self, value=None):
1106
if value is None: # get
1107
return dbus.String(self.checker_command)
1108
self.checker_command = value
1109
# Emit D-Bus signal
1110
self.PropertyChanged(dbus.String("Checker"),
1111
dbus.String(self.checker_command,
1112
variant_level=1))
1113
1114
# CheckerRunning - property
1115
@dbus_service_property(_interface, signature="b",
1116
access="readwrite")
1117
def CheckerRunning_dbus_property(self, value=None):
1118
if value is None: # get
1119
return dbus.Boolean(self.checker is not None)
1120
if value:
1121
self.start_checker()
1122
else:
1123
self.stop_checker()
1124
1125
# ObjectPath - property
1126
@dbus_service_property(_interface, signature="o", access="read")
1127
def ObjectPath_dbus_property(self):
1128
return self.dbus_object_path # is already a dbus.ObjectPath
1129
1130
# Secret = property
1131
@dbus_service_property(_interface, signature="ay",
1132
access="write", byte_arrays=True)
1133
def Secret_dbus_property(self, value):
1134
self.secret = str(value)
1135
1136
del _interface
1137
1138
1139
class ProxyClient(object):
1140
def __init__(self, child_pipe, fpr, address):
1141
self._pipe = child_pipe
1142
self._pipe.send(('init', fpr, address))
1143
if not self._pipe.recv():
1144
raise KeyError()
1145
1146
def __getattribute__(self, name):
1147
if(name == '_pipe'):
1148
return super(ProxyClient, self).__getattribute__(name)
1149
self._pipe.send(('getattr', name))
1150
data = self._pipe.recv()
1151
if data[0] == 'data':
1152
return data[1]
1153
if data[0] == 'function':
1154
def func(*args, **kwargs):
1155
self._pipe.send(('funcall', name, args, kwargs))
1156
return self._pipe.recv()[1]
1157
return func
1158
1159
def __setattr__(self, name, value):
1160
if(name == '_pipe'):
1161
return super(ProxyClient, self).__setattr__(name, value)
1162
self._pipe.send(('setattr', name, value))
1163
1164
1165
class ClientHandler(socketserver.BaseRequestHandler, object):
1166
"""A class to handle client connections.
1167
1168
Instantiated once for each connection to handle it.
426
1169
Note: This will run in its own forked process."""
427
1170
428
1171
def handle(self):
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.
1172
with contextlib.closing(self.server.child_pipe) as child_pipe:
1173
logger.info("TCP connection from: %s",
1174
unicode(self.client_address))
1175
logger.debug("Pipe FD: %d",
1176
self.server.child_pipe.fileno())
1177
1178
session = (gnutls.connection
1179
.ClientSession(self.request,
1180
gnutls.connection
1181
.X509Credentials()))
1182
1183
# Note: gnutls.connection.X509Credentials is really a
1184
# generic GnuTLS certificate credentials object so long as
1185
# no X.509 keys are added to it. Therefore, we can use it
1186
# here despite using OpenPGP certificates.
1187
1188
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
1189
# "+AES-256-CBC", "+SHA1",
1190
# "+COMP-NULL", "+CTYPE-OPENPGP",
1191
# "+DHE-DSS"))
1192
# Use a fallback default, since this MUST be set.
1193
priority = self.server.gnutls_priority
1194
if priority is None:
1195
priority = "NORMAL"
1196
(gnutls.library.functions
1197
.gnutls_priority_set_direct(session._c_object,
1198
priority, None))
1199
1200
# Start communication using the Mandos protocol
1201
# Get protocol number
1202
line = self.request.makefile().readline()
1203
logger.debug("Protocol version: %r", line)
1204
try:
1205
if int(line.strip().split()[0]) > 1:
1206
raise RuntimeError
1207
except (ValueError, IndexError, RuntimeError), error:
1208
logger.error("Unknown protocol version: %s", error)
1209
return
1210
1211
# Start GnuTLS connection
1212
try:
1213
session.handshake()
1214
except gnutls.errors.GNUTLSError, error:
1215
logger.warning("Handshake failed: %s", error)
1216
# Do not run session.bye() here: the session is not
1217
# established. Just abandon the request.
1218
return
1219
logger.debug("Handshake succeeded")
1220
1221
approval_required = False
1222
try:
1223
try:
1224
fpr = self.fingerprint(self.peer_certificate
1225
(session))
1226
except (TypeError, gnutls.errors.GNUTLSError), error:
1227
logger.warning("Bad certificate: %s", error)
1228
return
1229
logger.debug("Fingerprint: %s", fpr)
1230
1231
try:
1232
client = ProxyClient(child_pipe, fpr,
1233
self.client_address)
1234
except KeyError:
1235
return
1236
1237
if client.approval_delay:
1238
delay = client.approval_delay
1239
client.approvals_pending += 1
1240
approval_required = True
1241
1242
while True:
1243
if not client.enabled:
1244
logger.warning("Client %s is disabled",
1245
client.name)
1246
if self.server.use_dbus:
1247
# Emit D-Bus signal
1248
client.Rejected("Disabled")
1249
return
1250
1251
if client._approved or not client.approval_delay:
1252
#We are approved or approval is disabled
1253
break
1254
elif client._approved is None:
1255
logger.info("Client %s needs approval",
1256
client.name)
1257
if self.server.use_dbus:
1258
# Emit D-Bus signal
1259
client.NeedApproval(
1260
client.approval_delay_milliseconds(),
1261
client.approved_by_default)
1262
else:
1263
logger.warning("Client %s was not approved",
1264
client.name)
1265
if self.server.use_dbus:
1266
# Emit D-Bus signal
1267
client.Rejected("Denied")
1268
return
1269
1270
#wait until timeout or approved
1271
#x = float(client._timedelta_to_milliseconds(delay))
1272
time = datetime.datetime.now()
1273
client.changedstate.acquire()
1274
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1275
client.changedstate.release()
1276
time2 = datetime.datetime.now()
1277
if (time2 - time) >= delay:
1278
if not client.approved_by_default:
1279
logger.warning("Client %s timed out while"
1280
" waiting for approval",
1281
client.name)
1282
if self.server.use_dbus:
1283
# Emit D-Bus signal
1284
client.Rejected("Approval timed out")
1285
return
1286
else:
1287
break
1288
else:
1289
delay -= time2 - time
1290
1291
sent_size = 0
1292
while sent_size < len(client.secret):
1293
try:
1294
sent = session.send(client.secret[sent_size:])
1295
except (gnutls.errors.GNUTLSError), error:
1296
logger.warning("gnutls send failed")
1297
return
1298
logger.debug("Sent: %d, remaining: %d",
1299
sent, len(client.secret)
1300
- (sent_size + sent))
1301
sent_size += sent
1302
1303
logger.info("Sending secret to %s", client.name)
1304
# bump the timeout as if seen
1305
client.checked_ok()
1306
if self.server.use_dbus:
1307
# Emit D-Bus signal
1308
client.GotSecret()
1309
1310
finally:
1311
if approval_required:
1312
client.approvals_pending -= 1
1313
try:
1314
session.bye()
1315
except (gnutls.errors.GNUTLSError), error:
1316
logger.warning("GnuTLS bye failed")
1317
1318
@staticmethod
1319
def peer_certificate(session):
1320
"Return the peer's OpenPGP certificate as a bytestring"
1321
# If not an OpenPGP certificate...
1322
if (gnutls.library.functions
1323
.gnutls_certificate_type_get(session._c_object)
1324
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1325
# ...do the normal thing
1326
return session.peer_certificate
1327
list_size = ctypes.c_uint(1)
1328
cert_list = (gnutls.library.functions
1329
.gnutls_certificate_get_peers
1330
(session._c_object, ctypes.byref(list_size)))
1331
if not bool(cert_list) and list_size.value != 0:
1332
raise gnutls.errors.GNUTLSError("error getting peer"
1333
" certificate")
1334
if list_size.value == 0:
1335
return None
1336
cert = cert_list[0]
1337
return ctypes.string_at(cert.data, cert.size)
1338
1339
@staticmethod
1340
def fingerprint(openpgp):
1341
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1342
# New GnuTLS "datum" with the OpenPGP public key
1343
datum = (gnutls.library.types
1344
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1345
ctypes.POINTER
1346
(ctypes.c_ubyte)),
1347
ctypes.c_uint(len(openpgp))))
1348
# New empty GnuTLS certificate
1349
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1350
(gnutls.library.functions
1351
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1352
# Import the OpenPGP public key into the certificate
1353
(gnutls.library.functions
1354
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1355
gnutls.library.constants
1356
.GNUTLS_OPENPGP_FMT_RAW))
1357
# Verify the self signature in the key
1358
crtverify = ctypes.c_uint()
1359
(gnutls.library.functions
1360
.gnutls_openpgp_crt_verify_self(crt, 0,
1361
ctypes.byref(crtverify)))
1362
if crtverify.value != 0:
1363
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1364
raise (gnutls.errors.CertificateSecurityError
1365
("Verify failed"))
1366
# New buffer for the fingerprint
1367
buf = ctypes.create_string_buffer(20)
1368
buf_len = ctypes.c_size_t()
1369
# Get the fingerprint from the certificate into the buffer
1370
(gnutls.library.functions
1371
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1372
ctypes.byref(buf_len)))
1373
# Deinit the certificate
1374
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1375
# Convert the buffer to a Python bytestring
1376
fpr = ctypes.string_at(buf, buf_len.value)
1377
# Convert the bytestring to hexadecimal notation
1378
hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1379
return hex_fpr
1380
1381
1382
class MultiprocessingMixIn(object):
1383
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1384
def sub_process_main(self, request, address):
1385
try:
1386
self.finish_request(request, address)
1387
except:
1388
self.handle_error(request, address)
1389
self.close_request(request)
1390
1391
def process_request(self, request, address):
1392
"""Start a new process to process the request."""
1393
multiprocessing.Process(target = self.sub_process_main,
1394
args = (request, address)).start()
1395
1396
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1397
""" adds a pipe to the MixIn """
1398
def process_request(self, request, client_address):
1399
"""Overrides and wraps the original process_request().
1400
1401
This function creates a new pipe in self.pipe
1402
"""
1403
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1404
1405
super(MultiprocessingMixInWithPipe,
1406
self).process_request(request, client_address)
1407
self.child_pipe.close()
1408
self.add_pipe(parent_pipe)
1409
1410
def add_pipe(self, parent_pipe):
1411
"""Dummy function; override as necessary"""
1412
pass
1413
1414
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1415
socketserver.TCPServer, object):
1416
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1417
502
1418
Attributes:
503
settings: Server settings
504
clients: Set() of Client objects
1419
enabled: Boolean; whether this server is activated yet
1420
interface: None or a network interface name (string)
1421
use_ipv6: Boolean; to use IPv6 or not
505
1422
"""
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)
1423
def __init__(self, server_address, RequestHandlerClass,
1424
interface=None, use_ipv6=True):
1425
self.interface = interface
1426
if use_ipv6:
1427
self.address_family = socket.AF_INET6
1428
socketserver.TCPServer.__init__(self, server_address,
1429
RequestHandlerClass)
515
1430
def server_bind(self):
516
1431
"""This overrides the normal server_bind() function
517
1432
to bind to an interface if one was specified, and also NOT to
518
1433
bind to an address or port if they were not specified."""
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
1434
if self.interface is not None:
1435
if SO_BINDTODEVICE is None:
1436
logger.error("SO_BINDTODEVICE does not exist;"
1437
" cannot bind to interface %s",
1438
self.interface)
1439
else:
1440
try:
1441
self.socket.setsockopt(socket.SOL_SOCKET,
1442
SO_BINDTODEVICE,
1443
str(self.interface
1444
+ '\0'))
1445
except socket.error, error:
1446
if error[0] == errno.EPERM:
1447
logger.error("No permission to"
1448
" bind to interface %s",
1449
self.interface)
1450
elif error[0] == errno.ENOPROTOOPT:
1451
logger.error("SO_BINDTODEVICE not available;"
1452
" cannot bind to interface %s",
1453
self.interface)
1454
else:
1455
raise
533
1456
# Only bind(2) the socket if we really need to.
534
1457
if self.server_address[0] or self.server_address[1]:
535
1458
if not self.server_address[0]:
536
in6addr_any = "::"
537
self.server_address = (in6addr_any,
1459
if self.address_family == socket.AF_INET6:
1460
any_address = "::" # in6addr_any
1461
else:
1462
any_address = socket.INADDR_ANY
1463
self.server_address = (any_address,
538
1464
self.server_address[1])
539
1465
elif not self.server_address[1]:
540
1466
self.server_address = (self.server_address[0],
541
1467
0)
542
# if self.settings["interface"]:
1468
# if self.interface:
543
1469
# self.server_address = (self.server_address[0],
544
1470
# 0, # port
545
1471
# 0, # flowinfo
546
1472
# if_nametoindex
547
# (self.settings
548
# ["interface"]))
549
return super(type(self), self).server_bind()
1473
# (self.interface))
1474
return socketserver.TCPServer.server_bind(self)
1475
1476
1477
class MandosServer(IPv6_TCPServer):
1478
"""Mandos server.
1479
1480
Attributes:
1481
clients: set of Client objects
1482
gnutls_priority GnuTLS priority string
1483
use_dbus: Boolean; to emit D-Bus signals or not
1484
1485
Assumes a gobject.MainLoop event loop.
1486
"""
1487
def __init__(self, server_address, RequestHandlerClass,
1488
interface=None, use_ipv6=True, clients=None,
1489
gnutls_priority=None, use_dbus=True):
1490
self.enabled = False
1491
self.clients = clients
1492
if self.clients is None:
1493
self.clients = set()
1494
self.use_dbus = use_dbus
1495
self.gnutls_priority = gnutls_priority
1496
IPv6_TCPServer.__init__(self, server_address,
1497
RequestHandlerClass,
1498
interface = interface,
1499
use_ipv6 = use_ipv6)
1500
def server_activate(self):
1501
if self.enabled:
1502
return socketserver.TCPServer.server_activate(self)
1503
def enable(self):
1504
self.enabled = True
1505
def add_pipe(self, parent_pipe):
1506
# Call "handle_ipc" for both data and EOF events
1507
gobject.io_add_watch(parent_pipe.fileno(),
1508
gobject.IO_IN | gobject.IO_HUP,
1509
functools.partial(self.handle_ipc,
1510
parent_pipe = parent_pipe))
1511
1512
def handle_ipc(self, source, condition, parent_pipe=None,
1513
client_object=None):
1514
condition_names = {
1515
gobject.IO_IN: "IN", # There is data to read.
1516
gobject.IO_OUT: "OUT", # Data can be written (without
1517
# blocking).
1518
gobject.IO_PRI: "PRI", # There is urgent data to read.
1519
gobject.IO_ERR: "ERR", # Error condition.
1520
gobject.IO_HUP: "HUP" # Hung up (the connection has been
1521
# broken, usually for pipes and
1522
# sockets).
1523
}
1524
conditions_string = ' | '.join(name
1525
for cond, name in
1526
condition_names.iteritems()
1527
if cond & condition)
1528
# error or the other end of multiprocessing.Pipe has closed
1529
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1530
return False
1531
1532
# Read a request from the child
1533
request = parent_pipe.recv()
1534
command = request[0]
1535
1536
if command == 'init':
1537
fpr = request[1]
1538
address = request[2]
1539
1540
for c in self.clients:
1541
if c.fingerprint == fpr:
1542
client = c
1543
break
1544
else:
1545
logger.warning("Client not found for fingerprint: %s, ad"
1546
"dress: %s", fpr, address)
1547
if self.use_dbus:
1548
# Emit D-Bus signal
1549
mandos_dbus_service.ClientNotFound(fpr, address[0])
1550
parent_pipe.send(False)
1551
return False
1552
1553
gobject.io_add_watch(parent_pipe.fileno(),
1554
gobject.IO_IN | gobject.IO_HUP,
1555
functools.partial(self.handle_ipc,
1556
parent_pipe = parent_pipe,
1557
client_object = client))
1558
parent_pipe.send(True)
1559
# remove the old hook in favor of the new above hook on same fileno
1560
return False
1561
if command == 'funcall':
1562
funcname = request[1]
1563
args = request[2]
1564
kwargs = request[3]
1565
1566
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1567
1568
if command == 'getattr':
1569
attrname = request[1]
1570
if callable(client_object.__getattribute__(attrname)):
1571
parent_pipe.send(('function',))
1572
else:
1573
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1574
1575
if command == 'setattr':
1576
attrname = request[1]
1577
value = request[2]
1578
setattr(client_object, attrname, value)
1579
1580
return True
550
1581
551
1582
552
1583
def string_to_delta(interval):
553
1584
"""Parse a string and return a datetime.timedelta
554
1585
555
1586
>>> string_to_delta('7d')
556
1587
datetime.timedelta(7)
557
1588
>>> string_to_delta('60s')
560
1591
datetime.timedelta(0, 3600)
561
1592
>>> string_to_delta('24h')
562
1593
datetime.timedelta(1)
563
>>> string_to_delta(u'1w')
1594
>>> string_to_delta('1w')
564
1595
datetime.timedelta(7)
1596
>>> string_to_delta('5m 30s')
1597
datetime.timedelta(0, 330)
565
1598
"""
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))
1599
timevalue = datetime.timedelta(0)
1600
for s in interval.split():
1601
try:
1602
suffix = unicode(s[-1])
1603
value = int(s[:-1])
1604
if suffix == "d":
1605
delta = datetime.timedelta(value)
1606
elif suffix == "s":
1607
delta = datetime.timedelta(0, value)
1608
elif suffix == "m":
1609
delta = datetime.timedelta(0, 0, 0, 0, value)
1610
elif suffix == "h":
1611
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1612
elif suffix == "w":
1613
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1614
else:
1615
raise ValueError("Unknown suffix %r" % suffix)
1616
except (ValueError, IndexError), e:
1617
raise ValueError(e.message)
1618
timevalue += delta
1619
return timevalue
1620
608
1621
609
1622
def if_nametoindex(interface):
610
"""Call the C function if_nametoindex(), or equivalent"""
1623
"""Call the C function if_nametoindex(), or equivalent
1624
1625
Note: This function cannot accept a unicode string."""
611
1626
global if_nametoindex
612
1627
try:
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
1628
if_nametoindex = (ctypes.cdll.LoadLibrary
1629
(ctypes.util.find_library("c"))
1630
.if_nametoindex)
617
1631
except (OSError, AttributeError):
618
if "struct" not in sys.modules:
619
import struct
620
if "fcntl" not in sys.modules:
621
import fcntl
1632
logger.warning("Doing if_nametoindex the hard way")
622
1633
def if_nametoindex(interface):
623
1634
"Get an interface index the hard way, i.e. using fcntl()"
624
1635
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
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]
1636
with contextlib.closing(socket.socket()) as s:
1637
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1638
struct.pack(str("16s16x"),
1639
interface))
1640
interface_index = struct.unpack(str("I"),
1641
ifreq[16:20])[0]
630
1642
return interface_index
631
1643
return if_nametoindex(interface)
632
1644
633
1645
634
1646
def daemon(nochdir = False, noclose = False):
635
1647
"""See daemon(3). Standard BSD Unix function.
1648
636
1649
This should really exist as os.daemon, but it doesn't (yet)."""
637
1650
if os.fork():
638
1651
sys.exit()
646
1659
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
647
1660
if not stat.S_ISCHR(os.fstat(null).st_mode):
648
1661
raise OSError(errno.ENODEV,
649
"/dev/null not a character device")
1662
"%s not a character device"
1663
% os.path.devnull)
650
1664
os.dup2(null, sys.stdin.fileno())
651
1665
os.dup2(null, sys.stdout.fileno())
652
1666
os.dup2(null, sys.stderr.fileno())
655
1669
656
1670
657
1671
def main():
658
global main_loop_started
659
main_loop_started = False
660
661
parser = OptionParser(version = "%%prog %s" % version)
1672
1673
##################################################################
1674
# Parsing of options, both command line and config file
1675
1676
parser = optparse.OptionParser(version = "%%prog %s" % version)
662
1677
parser.add_option("-i", "--interface", type="string",
663
1678
metavar="IF", help="Bind to interface IF")
664
1679
parser.add_option("-a", "--address", type="string",
665
1680
help="Address to listen for requests on")
666
1681
parser.add_option("-p", "--port", type="int",
667
1682
help="Port number to receive requests on")
668
parser.add_option("--check", action="store_true", default=False,
1683
parser.add_option("--check", action="store_true",
669
1684
help="Run self-test")
670
1685
parser.add_option("--debug", action="store_true",
671
1686
help="Debug mode; run in foreground and log to"
672
1687
" terminal")
1688
parser.add_option("--debuglevel", type="string", metavar="LEVEL",
1689
help="Debug level for stdout output")
673
1690
parser.add_option("--priority", type="string", help="GnuTLS"
674
1691
" priority string (see GnuTLS documentation)")
675
parser.add_option("--servicename", type="string", metavar="NAME",
676
help="Zeroconf service name")
1692
parser.add_option("--servicename", type="string",
1693
metavar="NAME", help="Zeroconf service name")
677
1694
parser.add_option("--configdir", type="string",
678
1695
default="/etc/mandos", metavar="DIR",
679
1696
help="Directory to search for configuration"
680
1697
" files")
681
(options, args) = parser.parse_args()
1698
parser.add_option("--no-dbus", action="store_false",
1699
dest="use_dbus", help="Do not provide D-Bus"
1700
" system bus interface")
1701
parser.add_option("--no-ipv6", action="store_false",
1702
dest="use_ipv6", help="Do not use IPv6")
1703
options = parser.parse_args()[0]
682
1704
683
1705
if options.check:
684
1706
import doctest
693
1715
"priority":
694
1716
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
695
1717
"servicename": "Mandos",
1718
"use_dbus": "True",
1719
"use_ipv6": "True",
1720
"debuglevel": "",
696
1721
}
697
1722
698
1723
# Parse config file for server-global settings
699
server_config = ConfigParser.SafeConfigParser(server_defaults)
1724
server_config = configparser.SafeConfigParser(server_defaults)
700
1725
del server_defaults
701
server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
server_section = "server"
1726
server_config.read(os.path.join(options.configdir,
1727
"mandos.conf"))
703
1728
# Convert the SafeConfigParser object to a dict
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")
1729
server_settings = server_config.defaults()
1730
# Use the appropriate methods on the non-string config options
1731
for option in ("debug", "use_dbus", "use_ipv6"):
1732
server_settings[option] = server_config.getboolean("DEFAULT",
1733
option)
1734
if server_settings["port"]:
1735
server_settings["port"] = server_config.getint("DEFAULT",
1736
"port")
708
1737
del server_config
709
1738
710
1739
# Override the settings from the config file with command line
711
1740
# options, if set.
712
1741
for option in ("interface", "address", "port", "debug",
713
"priority", "servicename", "configdir"):
1742
"priority", "servicename", "configdir",
1743
"use_dbus", "use_ipv6", "debuglevel"):
714
1744
value = getattr(options, option)
715
1745
if value is not None:
716
1746
server_settings[option] = value
717
1747
del options
1748
# Force all strings to be unicode
1749
for option in server_settings.keys():
1750
if type(server_settings[option]) is str:
1751
server_settings[option] = unicode(server_settings[option])
718
1752
# Now we have our good server settings in "server_settings"
719
1753
1754
##################################################################
1755
1756
# For convenience
720
1757
debug = server_settings["debug"]
721
722
if not debug:
723
syslogger.setLevel(logging.WARNING)
724
console.setLevel(logging.WARNING)
725
1758
debuglevel = server_settings["debuglevel"]
1759
use_dbus = server_settings["use_dbus"]
1760
use_ipv6 = server_settings["use_ipv6"]
1761
726
1762
if server_settings["servicename"] != "Mandos":
727
syslogger.setFormatter(logging.Formatter\
728
('Mandos (%s): %%(levelname)s:'
729
' %%(message)s'
1763
syslogger.setFormatter(logging.Formatter
1764
('Mandos (%s) [%%(process)d]:'
1765
' %%(levelname)s: %%(message)s'
730
1766
% server_settings["servicename"]))
731
1767
732
1768
# Parse config file with clients
733
1769
client_defaults = { "timeout": "1h",
734
1770
"interval": "5m",
735
1771
"checker": "fping -q -- %%(host)s",
1772
"host": "",
1773
"approval_delay": "0s",
1774
"approval_duration": "1s",
736
1775
}
737
client_config = ConfigParser.SafeConfigParser(client_defaults)
1776
client_config = configparser.SafeConfigParser(client_defaults)
738
1777
client_config.read(os.path.join(server_settings["configdir"],
739
1778
"clients.conf"))
740
1779
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"])
1780
global mandos_dbus_service
1781
mandos_dbus_service = None
1782
1783
tcp_server = MandosServer((server_settings["address"],
1784
server_settings["port"]),
1785
ClientHandler,
1786
interface=(server_settings["interface"]
1787
or None),
1788
use_ipv6=use_ipv6,
1789
gnutls_priority=
1790
server_settings["priority"],
1791
use_dbus=use_dbus)
1792
if not debug:
1793
pidfilename = "/var/run/mandos.pid"
1794
try:
1795
pidfile = open(pidfilename, "w")
1796
except IOError:
1797
logger.error("Could not open file %r", pidfilename)
1798
1799
try:
1800
uid = pwd.getpwnam("_mandos").pw_uid
1801
gid = pwd.getpwnam("_mandos").pw_gid
1802
except KeyError:
1803
try:
1804
uid = pwd.getpwnam("mandos").pw_uid
1805
gid = pwd.getpwnam("mandos").pw_gid
1806
except KeyError:
1807
try:
1808
uid = pwd.getpwnam("nobody").pw_uid
1809
gid = pwd.getpwnam("nobody").pw_gid
1810
except KeyError:
1811
uid = 65534
1812
gid = 65534
1813
try:
1814
os.setgid(gid)
1815
os.setuid(uid)
1816
except OSError, error:
1817
if error[0] != errno.EPERM:
1818
raise error
1819
1820
if not debug and not debuglevel:
1821
syslogger.setLevel(logging.WARNING)
1822
console.setLevel(logging.WARNING)
1823
if debuglevel:
1824
level = getattr(logging, debuglevel.upper())
1825
syslogger.setLevel(level)
1826
console.setLevel(level)
1827
1828
if debug:
1829
# Enable all possible GnuTLS debugging
1830
1831
# "Use a log level over 10 to enable all debugging options."
1832
# - GnuTLS manual
1833
gnutls.library.functions.gnutls_global_set_log_level(11)
1834
1835
@gnutls.library.types.gnutls_log_func
1836
def debug_gnutls(level, string):
1837
logger.debug("GnuTLS: %s", string[:-1])
1838
1839
(gnutls.library.functions
1840
.gnutls_global_set_log_function(debug_gnutls))
1841
1842
# Redirect stdin so all checkers get /dev/null
1843
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1844
os.dup2(null, sys.stdin.fileno())
1845
if null > 2:
1846
os.close(null)
1847
else:
1848
# No console logging
1849
logger.removeHandler(console)
1850
1851
# Need to fork before connecting to D-Bus
1852
if not debug:
1853
# Close all input and output, do double fork, etc.
1854
daemon()
746
1855
747
1856
global main_loop
748
global bus
749
global server
750
1857
# From the Avahi example code
751
1858
DBusGMainLoop(set_as_default=True )
752
1859
main_loop = gobject.MainLoop()
753
1860
bus = dbus.SystemBus()
754
server = dbus.Interface(
755
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
avahi.DBUS_INTERFACE_SERVER )
757
1861
# End of Avahi example code
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
1862
if use_dbus:
1863
try:
1864
bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1865
bus, do_not_queue=True)
1866
except dbus.exceptions.NameExistsException, e:
1867
logger.error(unicode(e) + ", disabling D-Bus")
1868
use_dbus = False
1869
server_settings["use_dbus"] = False
1870
tcp_server.use_dbus = False
1871
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1872
service = AvahiService(name = server_settings["servicename"],
1873
servicetype = "_mandos._tcp",
1874
protocol = protocol, bus = bus)
1875
if server_settings["interface"]:
1876
service.interface = (if_nametoindex
1877
(str(server_settings["interface"])))
1878
1879
global multiprocessing_manager
1880
multiprocessing_manager = multiprocessing.Manager()
1881
1882
client_class = Client
1883
if use_dbus:
1884
client_class = functools.partial(ClientDBus, bus = bus)
1885
def client_config_items(config, section):
1886
special_settings = {
1887
"approved_by_default":
1888
lambda: config.getboolean(section,
1889
"approved_by_default"),
1890
}
1891
for name, value in config.items(section):
1892
try:
1893
yield (name, special_settings[name]())
1894
except KeyError:
1895
yield (name, value)
1896
1897
tcp_server.clients.update(set(
1898
client_class(name = section,
1899
config= dict(client_config_items(
1900
client_config, section)))
1901
for section in client_config.sections()))
1902
if not tcp_server.clients:
1903
logger.warning("No clients defined")
1904
775
1905
if not debug:
776
logger.removeHandler(console)
777
daemon()
1906
try:
1907
with pidfile:
1908
pid = os.getpid()
1909
pidfile.write(str(pid) + "\n".encode("utf-8"))
1910
del pidfile
1911
except IOError:
1912
logger.error("Could not write to file %r with PID %d",
1913
pidfilename, pid)
1914
except NameError:
1915
# "pidfile" was never created
1916
pass
1917
del pidfilename
1918
1919
signal.signal(signal.SIGINT, signal.SIG_IGN)
1920
1921
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1922
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
778
1923
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())
1924
if use_dbus:
1925
class MandosDBusService(dbus.service.Object):
1926
"""A D-Bus proxy object"""
1927
def __init__(self):
1928
dbus.service.Object.__init__(self, bus, "/")
1929
_interface = "se.bsnet.fukt.Mandos"
1930
1931
@dbus.service.signal(_interface, signature="o")
1932
def ClientAdded(self, objpath):
1933
"D-Bus signal"
1934
pass
1935
1936
@dbus.service.signal(_interface, signature="ss")
1937
def ClientNotFound(self, fingerprint, address):
1938
"D-Bus signal"
1939
pass
1940
1941
@dbus.service.signal(_interface, signature="os")
1942
def ClientRemoved(self, objpath, name):
1943
"D-Bus signal"
1944
pass
1945
1946
@dbus.service.method(_interface, out_signature="ao")
1947
def GetAllClients(self):
1948
"D-Bus method"
1949
return dbus.Array(c.dbus_object_path
1950
for c in tcp_server.clients)
1951
1952
@dbus.service.method(_interface,
1953
out_signature="a{oa{sv}}")
1954
def GetAllClientsWithProperties(self):
1955
"D-Bus method"
1956
return dbus.Dictionary(
1957
((c.dbus_object_path, c.GetAll(""))
1958
for c in tcp_server.clients),
1959
signature="oa{sv}")
1960
1961
@dbus.service.method(_interface, in_signature="o")
1962
def RemoveClient(self, object_path):
1963
"D-Bus method"
1964
for c in tcp_server.clients:
1965
if c.dbus_object_path == object_path:
1966
tcp_server.clients.remove(c)
1967
c.remove_from_connection()
1968
# Don't signal anything except ClientRemoved
1969
c.disable(quiet=True)
1970
# Emit D-Bus signal
1971
self.ClientRemoved(object_path, c.name)
1972
return
1973
raise KeyError(object_path)
1974
1975
del _interface
1976
1977
mandos_dbus_service = MandosDBusService()
789
1978
790
1979
def cleanup():
791
1980
"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
1981
service.cleanup()
798
1982
799
while clients:
800
client = clients.pop()
801
client.stop_hook = None
802
client.stop()
1983
while tcp_server.clients:
1984
client = tcp_server.clients.pop()
1985
if use_dbus:
1986
client.remove_from_connection()
1987
client.disable_hook = None
1988
# Don't signal anything except ClientRemoved
1989
client.disable(quiet=True)
1990
if use_dbus:
1991
# Emit D-Bus signal
1992
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1993
client.name)
803
1994
804
1995
atexit.register(cleanup)
805
1996
806
if not debug:
807
signal.signal(signal.SIGINT, signal.SIG_IGN)
808
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
809
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
810
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)
1997
for client in tcp_server.clients:
1998
if use_dbus:
1999
# Emit D-Bus signal
2000
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2001
client.enable()
2002
2003
tcp_server.enable()
2004
tcp_server.server_activate()
2005
819
2006
# Find out what port we got
820
2007
service.port = tcp_server.socket.getsockname()[1]
821
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
u" scope_id %d" % tcp_server.socket.getsockname())
2008
if use_ipv6:
2009
logger.info("Now listening on address %r, port %d,"
2010
" flowinfo %d, scope_id %d"
2011
% tcp_server.socket.getsockname())
2012
else: # IPv4
2013
logger.info("Now listening on address %r, port %d"
2014
% tcp_server.socket.getsockname())
823
2015
824
2016
#service.interface = tcp_server.socket.getsockname()[3]
825
2017
826
2018
try:
827
2019
# From the Avahi example code
828
server.connect_to_signal("StateChanged", server_state_changed)
829
2020
try:
830
server_state_changed(server.GetState())
2021
service.activate()
831
2022
except dbus.exceptions.DBusException, error:
832
logger.critical(u"DBusException: %s", error)
2023
logger.critical("DBusException: %s", error)
2024
cleanup()
833
2025
sys.exit(1)
834
2026
# End of Avahi example code
835
2027
836
2028
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
2029
lambda *args, **kwargs:
838
tcp_server.handle_request\
839
(*args[2:], **kwargs) or True)
2030
(tcp_server.handle_request
2031
(*args[2:], **kwargs) or True))
840
2032
841
logger.debug(u"Starting main loop")
842
main_loop_started = True
2033
logger.debug("Starting main loop")
843
2034
main_loop.run()
844
2035
except AvahiError, error:
845
logger.critical(u"AvahiError: %s" + unicode(error))
2036
logger.critical("AvahiError: %s", error)
2037
cleanup()
846
2038
sys.exit(1)
847
2039
except KeyboardInterrupt:
848
2040
if debug:
849
print
2041
print("", file=sys.stderr)
2042
logger.debug("Server received KeyboardInterrupt")
2043
logger.debug("Server exiting")
2044
# Must run before the D-Bus bus name gets deregistered
2045
cleanup()
850
2046
851
2047
if __name__ == '__main__':
852
2048
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0