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- Committer: teddy at bsnet
- Date: 2011-03-21 19:34:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20110321193439-lkj3kwvhmujd8lwv
* plugins.d/mandos-client.c (good_interface): Reject non-ARP
interfaces.
interfaces.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
mandos
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add" and "remove" in the "AvahiService" class, the
10
# "server_state_changed" and "entry_group_state_changed" functions,
11
# and some lines in "main".
9
# methods "add", "remove", "server_state_changed",
10
# "entry_group_state_changed", "cleanup", and "activate" in the
11
# "AvahiService" class, and some lines in "main".
12
12
#
13
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
# Copyright © 2008-2011 Teddy Hogeborn
15
# Copyright © 2008-2011 Björn Påhlsson
15
16
#
16
17
# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
24
25
# GNU General Public License for more details.
25
26
#
26
27
# You should have received a copy of the GNU General Public License
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
28
# along with this program. If not, see
29
# <http://www.gnu.org/licenses/>.
28
30
#
29
31
# Contact the authors at <mandos@fukt.bsnet.se>.
30
32
#
31
33
32
from __future__ import division
34
from __future__ import (division, absolute_import, print_function,
35
unicode_literals)
33
36
34
import SocketServer
37
import SocketServer as socketserver
35
38
import socket
36
import select
37
from optparse import OptionParser
39
import argparse
38
40
import datetime
39
41
import errno
40
42
import gnutls.crypto
43
45
import gnutls.library.functions
44
46
import gnutls.library.constants
45
47
import gnutls.library.types
46
import ConfigParser
48
import ConfigParser as configparser
47
49
import sys
48
50
import re
49
51
import os
50
52
import signal
51
from sets import Set
52
53
import subprocess
53
54
import atexit
54
55
import stat
55
56
import logging
56
57
import logging.handlers
58
import pwd
59
import contextlib
60
import struct
61
import fcntl
62
import functools
63
import cPickle as pickle
64
import multiprocessing
57
65
58
66
import dbus
67
import dbus.service
59
68
import gobject
60
69
import avahi
61
70
from dbus.mainloop.glib import DBusGMainLoop
62
71
import ctypes
63
64
72
import ctypes.util
73
import xml.dom.minidom
74
import inspect
75
76
try:
77
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
78
except AttributeError:
79
try:
80
from IN import SO_BINDTODEVICE
81
except ImportError:
82
SO_BINDTODEVICE = None
83
84
85
version = "1.3.0"
86
87
#logger = logging.getLogger('mandos')
65
88
logger = logging.Logger('mandos')
66
syslogger = logging.handlers.SysLogHandler\
67
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
68
address = "/dev/log")
69
syslogger.setFormatter(logging.Formatter\
70
('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'))
71
95
logger.addHandler(syslogger)
72
96
97
console = logging.StreamHandler()
98
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
' %(levelname)s:'
100
' %(message)s'))
101
logger.addHandler(console)
73
102
74
103
class AvahiError(Exception):
75
def __init__(self, value):
104
def __init__(self, value, *args, **kwargs):
76
105
self.value = value
77
def __str__(self):
78
return repr(self.value)
106
super(AvahiError, self).__init__(value, *args, **kwargs)
107
def __unicode__(self):
108
return unicode(repr(self.value))
79
109
80
110
class AvahiServiceError(AvahiError):
81
111
pass
86
116
87
117
class AvahiService(object):
88
118
"""An Avahi (Zeroconf) service.
119
89
120
Attributes:
90
121
interface: integer; avahi.IF_UNSPEC or an interface index.
91
122
Used to optionally bind to the specified interface.
99
130
max_renames: integer; maximum number of renames
100
131
rename_count: integer; counter so we only rename after collisions
101
132
a sensible number of times
133
group: D-Bus Entry Group
134
server: D-Bus Server
135
bus: dbus.SystemBus()
102
136
"""
103
137
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
104
type = None, port = None, TXT = None, domain = "",
105
host = "", max_renames = 32768):
138
servicetype = None, port = None, TXT = None,
139
domain = "", host = "", max_renames = 32768,
140
protocol = avahi.PROTO_UNSPEC, bus = None):
106
141
self.interface = interface
107
142
self.name = name
108
self.type = type
143
self.type = servicetype
109
144
self.port = port
110
if TXT is None:
111
self.TXT = []
112
else:
113
self.TXT = TXT
145
self.TXT = TXT if TXT is not None else []
114
146
self.domain = domain
115
147
self.host = host
116
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
117
154
def rename(self):
118
155
"""Derived from the Avahi example code"""
119
156
if self.rename_count >= self.max_renames:
120
logger.critical(u"No suitable service name found after %i"
121
u" retries, exiting.", rename_count)
157
logger.critical("No suitable Zeroconf service name found"
158
" after %i retries, exiting.",
159
self.rename_count)
122
160
raise AvahiServiceError("Too many renames")
123
name = server.GetAlternativeServiceName(name)
124
logger.error(u"Changing name to %r ...", name)
125
syslogger.setFormatter(logging.Formatter\
126
('Mandos (%s): %%(levelname)s:'
127
' %%(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))
128
168
self.remove()
129
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)
130
175
self.rename_count += 1
131
176
def remove(self):
132
177
"""Derived from the Avahi example code"""
133
if group is not None:
134
group.Reset()
178
if self.group is not None:
179
self.group.Reset()
135
180
def add(self):
136
181
"""Derived from the Avahi example code"""
137
global group
138
if group is None:
139
group = dbus.Interface\
140
(bus.get_object(avahi.DBUS_NAME,
141
server.EntryGroupNew()),
142
avahi.DBUS_INTERFACE_ENTRY_GROUP)
143
group.connect_to_signal('StateChanged',
144
entry_group_state_changed)
145
logger.debug(u"Adding service '%s' of type '%s' ...",
146
service.name, service.type)
147
group.AddService(
148
self.interface, # interface
149
avahi.PROTO_INET6, # protocol
150
dbus.UInt32(0), # flags
151
self.name, self.type,
152
self.domain, self.host,
153
dbus.UInt16(self.port),
154
avahi.string_array_to_txt_array(self.TXT))
155
group.Commit()
156
157
# From the Avahi example code:
158
group = None # our entry group
159
# 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())
160
238
161
239
162
240
class Client(object):
163
241
"""A representation of a client host served by this server.
242
164
243
Attributes:
165
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()
166
261
fingerprint: string (40 or 32 hexadecimal digits); used to
167
262
uniquely identify the client
168
secret: bytestring; sent verbatim (over TLS) to client
169
host: string; available for use by the checker command
170
created: datetime.datetime(); object creation, not client host
171
last_checked_ok: datetime.datetime() or None if not yet checked OK
172
timeout: datetime.timedelta(); How long from last_checked_ok
173
until this client is invalid
174
interval: datetime.timedelta(); How often to start a new checker
175
stop_hook: If set, called by stop() as stop_hook(self)
176
checker: subprocess.Popen(); a running checker process used
177
to see if the client lives.
178
'None' if no process is running.
179
checker_initiator_tag: a gobject event source tag, or None
180
stop_initiator_tag: - '' -
181
checker_callback_tag: - '' -
182
checker_command: string; External command which is run to check if
183
client lives. %() expansions are done at
184
runtime with vars(self) as dict, so that for
185
instance %(name)s can be used in the command.
186
Private attibutes:
187
_timeout: Real variable for 'timeout'
188
_interval: Real variable for 'interval'
189
_timeout_milliseconds: Used when calling gobject.timeout_add()
190
_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.
191
274
"""
192
def _set_timeout(self, timeout):
193
"Setter function for 'timeout' attribute"
194
self._timeout = timeout
195
self._timeout_milliseconds = ((self.timeout.days
196
* 24 * 60 * 60 * 1000)
197
+ (self.timeout.seconds * 1000)
198
+ (self.timeout.microseconds
199
// 1000))
200
timeout = property(lambda self: self._timeout,
201
_set_timeout)
202
del _set_timeout
203
def _set_interval(self, interval):
204
"Setter function for 'interval' attribute"
205
self._interval = interval
206
self._interval_milliseconds = ((self.interval.days
207
* 24 * 60 * 60 * 1000)
208
+ (self.interval.seconds
209
* 1000)
210
+ (self.interval.microseconds
211
// 1000))
212
interval = property(lambda self: self._interval,
213
_set_interval)
214
del _set_interval
215
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):
216
300
"""Note: the 'checker' key in 'config' sets the
217
301
'checker_command' attribute and *not* the 'checker'
218
302
attribute."""
219
303
self.name = name
220
logger.debug(u"Creating client %r", self.name)
304
if config is None:
305
config = {}
306
logger.debug("Creating client %r", self.name)
221
307
# Uppercase and remove spaces from fingerprint for later
222
308
# comparison purposes with return value from the fingerprint()
223
309
# function
224
self.fingerprint = config["fingerprint"].upper()\
225
.replace(u" ", u"")
226
logger.debug(u" Fingerprint: %s", self.fingerprint)
310
self.fingerprint = (config["fingerprint"].upper()
311
.replace(" ", ""))
312
logger.debug(" Fingerprint: %s", self.fingerprint)
227
313
if "secret" in config:
228
self.secret = config["secret"].decode(u"base64")
314
self.secret = config["secret"].decode("base64")
229
315
elif "secfile" in config:
230
sf = open(config["secfile"])
231
self.secret = sf.read()
232
sf.close()
316
with open(os.path.expanduser(os.path.expandvars
317
(config["secfile"])),
318
"rb") as secfile:
319
self.secret = secfile.read()
233
320
else:
234
raise TypeError(u"No secret or secfile for client %s"
321
raise TypeError("No secret or secfile for client %s"
235
322
% self.name)
236
323
self.host = config.get("host", "")
237
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
238
328
self.last_checked_ok = None
239
329
self.timeout = string_to_delta(config["timeout"])
240
330
self.interval = string_to_delta(config["interval"])
241
self.stop_hook = stop_hook
331
self.disable_hook = disable_hook
242
332
self.checker = None
243
333
self.checker_initiator_tag = None
244
self.stop_initiator_tag = None
334
self.disable_initiator_tag = None
245
335
self.checker_callback_tag = None
246
self.check_command = config["checker"]
247
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):
248
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()
249
361
# Schedule a new checker to be started an 'interval' from now,
250
362
# and every interval from then on.
251
self.checker_initiator_tag = gobject.timeout_add\
252
(self._interval_milliseconds,
253
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
254
371
# Also start a new checker *right now*.
255
372
self.start_checker()
256
# Schedule a stop() when 'timeout' has passed
257
self.stop_initiator_tag = gobject.timeout_add\
258
(self._timeout_milliseconds,
259
self.stop)
260
def stop(self):
261
"""Stop this client.
262
The possibility that a client might be restarted is left open,
263
but not currently used."""
264
# If this client doesn't have a secret, it is already stopped.
265
if hasattr(self, "secret") and self.secret:
266
logger.info(u"Stopping client %s", self.name)
267
self.secret = None
268
else:
373
374
def disable(self, quiet=True):
375
"""Disable this client."""
376
if not getattr(self, "enabled", False):
269
377
return False
270
if getattr(self, "stop_initiator_tag", False):
271
gobject.source_remove(self.stop_initiator_tag)
272
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
273
385
if getattr(self, "checker_initiator_tag", False):
274
386
gobject.source_remove(self.checker_initiator_tag)
275
387
self.checker_initiator_tag = None
276
388
self.stop_checker()
277
if self.stop_hook:
278
self.stop_hook(self)
389
if self.disable_hook:
390
self.disable_hook(self)
391
self.enabled = False
279
392
# Do not run this again if called by a gobject.timeout_add
280
393
return False
394
281
395
def __del__(self):
282
self.stop_hook = None
283
self.stop()
284
def checker_callback(self, pid, condition):
396
self.disable_hook = None
397
self.disable()
398
399
def checker_callback(self, pid, condition, command):
285
400
"""The checker has completed, so take appropriate actions."""
286
now = datetime.datetime.now()
287
401
self.checker_callback_tag = None
288
402
self.checker = None
289
if os.WIFEXITED(condition) \
290
and (os.WEXITSTATUS(condition) == 0):
291
logger.info(u"Checker for %(name)s succeeded",
292
vars(self))
293
self.last_checked_ok = now
294
gobject.source_remove(self.stop_initiator_tag)
295
self.stop_initiator_tag = gobject.timeout_add\
296
(self._timeout_milliseconds,
297
self.stop)
298
elif not os.WIFEXITED(condition):
299
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?",
300
414
vars(self))
301
else:
302
logger.info(u"Checker for %(name)s failed",
303
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
304
431
def start_checker(self):
305
432
"""Start a new checker subprocess if one is not running.
433
306
434
If a checker already exists, leave it running and do
307
435
nothing."""
308
436
# The reason for not killing a running checker is that if we
311
439
# client would inevitably timeout, since no checker would get
312
440
# a chance to run to completion. If we instead leave running
313
441
# checkers alone, the checker would have to take more time
314
# than 'timeout' for the client to be declared invalid, which
315
# 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
316
459
if self.checker is None:
317
460
try:
318
# In case check_command has exactly one % operator
319
command = self.check_command % self.host
461
# In case checker_command has exactly one % operator
462
command = self.checker_command % self.host
320
463
except TypeError:
321
464
# Escape attributes for the shell
322
escaped_attrs = dict((key, re.escape(str(val)))
323
for key, val in
324
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
325
473
try:
326
command = self.check_command % escaped_attrs
474
command = self.checker_command % escaped_attrs
327
475
except TypeError, error:
328
logger.error(u'Could not format string "%s":'
329
u' %s', self.check_command, error)
476
logger.error('Could not format string "%s":'
477
' %s', self.checker_command, error)
330
478
return True # Try again later
479
self.current_checker_command = command
331
480
try:
332
logger.info(u"Starting checker %r for %s",
481
logger.info("Starting checker %r for %s",
333
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.)
334
487
self.checker = subprocess.Popen(command,
335
488
close_fds=True,
336
489
shell=True, cwd="/")
337
self.checker_callback_tag = gobject.child_watch_add\
338
(self.checker.pid,
339
self.checker_callback)
340
except subprocess.OSError, error:
341
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",
342
502
error)
343
503
# Re-run this periodically if run by gobject.timeout_add
344
504
return True
505
345
506
def stop_checker(self):
346
507
"""Force the checker process, if any, to stop."""
347
508
if self.checker_callback_tag:
349
510
self.checker_callback_tag = None
350
511
if getattr(self, "checker", None) is None:
351
512
return
352
logger.debug(u"Stopping checker for %(name)s", vars(self))
513
logger.debug("Stopping checker for %(name)s", vars(self))
353
514
try:
354
515
os.kill(self.checker.pid, signal.SIGTERM)
355
#os.sleep(0.5)
516
#time.sleep(0.5)
356
517
#if self.checker.poll() is None:
357
518
# os.kill(self.checker.pid, signal.SIGKILL)
358
519
except OSError, error:
359
520
if error.errno != errno.ESRCH: # No such process
360
521
raise
361
522
self.checker = None
362
def still_valid(self):
363
"""Has the timeout not yet passed for this client?"""
364
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
365
1042
if self.last_checked_ok is None:
366
return now < (self.created + self.timeout)
367
else:
368
return now < (self.last_checked_ok + self.timeout)
369
370
371
def peer_certificate(session):
372
"Return the peer's OpenPGP certificate as a bytestring"
373
# If not an OpenPGP certificate...
374
if gnutls.library.functions.gnutls_certificate_type_get\
375
(session._c_object) \
376
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
377
# ...do the normal thing
378
return session.peer_certificate
379
list_size = ctypes.c_uint()
380
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
381
(session._c_object, ctypes.byref(list_size))
382
if list_size.value == 0:
383
return None
384
cert = cert_list[0]
385
return ctypes.string_at(cert.data, cert.size)
386
387
388
def fingerprint(openpgp):
389
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
390
# New GnuTLS "datum" with the OpenPGP public key
391
datum = gnutls.library.types.gnutls_datum_t\
392
(ctypes.cast(ctypes.c_char_p(openpgp),
393
ctypes.POINTER(ctypes.c_ubyte)),
394
ctypes.c_uint(len(openpgp)))
395
# New empty GnuTLS certificate
396
crt = gnutls.library.types.gnutls_openpgp_crt_t()
397
gnutls.library.functions.gnutls_openpgp_crt_init\
398
(ctypes.byref(crt))
399
# Import the OpenPGP public key into the certificate
400
gnutls.library.functions.gnutls_openpgp_crt_import\
401
(crt, ctypes.byref(datum),
402
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
403
# New buffer for the fingerprint
404
buffer = ctypes.create_string_buffer(20)
405
buffer_length = ctypes.c_size_t()
406
# Get the fingerprint from the certificate into the buffer
407
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
408
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
409
# Deinit the certificate
410
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
411
# Convert the buffer to a Python bytestring
412
fpr = ctypes.string_at(buffer, buffer_length.value)
413
# Convert the bytestring to hexadecimal notation
414
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
415
return hex_fpr
416
417
418
class tcp_handler(SocketServer.BaseRequestHandler, object):
419
"""A TCP request handler class.
420
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.
421
1169
Note: This will run in its own forked process."""
422
1170
423
1171
def handle(self):
424
logger.info(u"TCP connection from: %s",
425
unicode(self.client_address))
426
session = gnutls.connection.ClientSession\
427
(self.request, gnutls.connection.X509Credentials())
428
429
line = self.request.makefile().readline()
430
logger.debug(u"Protocol version: %r", line)
431
try:
432
if int(line.strip().split()[0]) > 1:
433
raise RuntimeError
434
except (ValueError, IndexError, RuntimeError), error:
435
logger.error(u"Unknown protocol version: %s", error)
436
return
437
438
# Note: gnutls.connection.X509Credentials is really a generic
439
# GnuTLS certificate credentials object so long as no X.509
440
# keys are added to it. Therefore, we can use it here despite
441
# using OpenPGP certificates.
442
443
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
444
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
445
# "+DHE-DSS"))
446
priority = "NORMAL" # Fallback default, since this
447
# MUST be set.
448
if self.server.settings["priority"]:
449
priority = self.server.settings["priority"]
450
gnutls.library.functions.gnutls_priority_set_direct\
451
(session._c_object, priority, None);
452
453
try:
454
session.handshake()
455
except gnutls.errors.GNUTLSError, error:
456
logger.warning(u"Handshake failed: %s", error)
457
# Do not run session.bye() here: the session is not
458
# established. Just abandon the request.
459
return
460
try:
461
fpr = fingerprint(peer_certificate(session))
462
except (TypeError, gnutls.errors.GNUTLSError), error:
463
logger.warning(u"Bad certificate: %s", error)
464
session.bye()
465
return
466
logger.debug(u"Fingerprint: %s", fpr)
467
client = None
468
for c in self.server.clients:
469
if c.fingerprint == fpr:
470
client = c
471
break
472
if not client:
473
logger.warning(u"Client not found for fingerprint: %s",
474
fpr)
475
session.bye()
476
return
477
# Have to check if client.still_valid(), since it is possible
478
# that the client timed out while establishing the GnuTLS
479
# session.
480
if not client.still_valid():
481
logger.warning(u"Client %(name)s is invalid",
482
vars(client))
483
session.bye()
484
return
485
sent_size = 0
486
while sent_size < len(client.secret):
487
sent = session.send(client.secret[sent_size:])
488
logger.debug(u"Sent: %d, remaining: %d",
489
sent, len(client.secret)
490
- (sent_size + sent))
491
sent_size += sent
492
session.bye()
493
494
495
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
496
"""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
raise NotImplementedError
1413
1414
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1415
socketserver.TCPServer, object):
1416
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1417
497
1418
Attributes:
498
settings: Server settings
499
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
500
1422
"""
501
address_family = socket.AF_INET6
502
def __init__(self, *args, **kwargs):
503
if "settings" in kwargs:
504
self.settings = kwargs["settings"]
505
del kwargs["settings"]
506
if "clients" in kwargs:
507
self.clients = kwargs["clients"]
508
del kwargs["clients"]
509
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)
510
1430
def server_bind(self):
511
1431
"""This overrides the normal server_bind() function
512
1432
to bind to an interface if one was specified, and also NOT to
513
1433
bind to an address or port if they were not specified."""
514
if self.settings["interface"]:
515
# 25 is from /usr/include/asm-i486/socket.h
516
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
517
try:
518
self.socket.setsockopt(socket.SOL_SOCKET,
519
SO_BINDTODEVICE,
520
self.settings["interface"])
521
except socket.error, error:
522
if error[0] == errno.EPERM:
523
logger.error(u"No permission to"
524
u" bind to interface %s",
525
self.settings["interface"])
526
else:
527
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
528
1456
# Only bind(2) the socket if we really need to.
529
1457
if self.server_address[0] or self.server_address[1]:
530
1458
if not self.server_address[0]:
531
in6addr_any = "::"
532
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,
533
1464
self.server_address[1])
534
1465
elif not self.server_address[1]:
535
1466
self.server_address = (self.server_address[0],
536
1467
0)
537
# if self.settings["interface"]:
1468
# if self.interface:
538
1469
# self.server_address = (self.server_address[0],
539
1470
# 0, # port
540
1471
# 0, # flowinfo
541
1472
# if_nametoindex
542
# (self.settings
543
# ["interface"]))
544
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
545
1581
546
1582
547
1583
def string_to_delta(interval):
548
1584
"""Parse a string and return a datetime.timedelta
549
1585
550
1586
>>> string_to_delta('7d')
551
1587
datetime.timedelta(7)
552
1588
>>> string_to_delta('60s')
555
1591
datetime.timedelta(0, 3600)
556
1592
>>> string_to_delta('24h')
557
1593
datetime.timedelta(1)
558
>>> string_to_delta(u'1w')
1594
>>> string_to_delta('1w')
559
1595
datetime.timedelta(7)
1596
>>> string_to_delta('5m 30s')
1597
datetime.timedelta(0, 330)
560
1598
"""
561
try:
562
suffix=unicode(interval[-1])
563
value=int(interval[:-1])
564
if suffix == u"d":
565
delta = datetime.timedelta(value)
566
elif suffix == u"s":
567
delta = datetime.timedelta(0, value)
568
elif suffix == u"m":
569
delta = datetime.timedelta(0, 0, 0, 0, value)
570
elif suffix == u"h":
571
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
572
elif suffix == u"w":
573
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
574
else:
575
raise ValueError
576
except (ValueError, IndexError):
577
raise ValueError
578
return delta
579
580
581
def server_state_changed(state):
582
"""Derived from the Avahi example code"""
583
if state == avahi.SERVER_COLLISION:
584
logger.error(u"Server name collision")
585
service.remove()
586
elif state == avahi.SERVER_RUNNING:
587
service.add()
588
589
590
def entry_group_state_changed(state, error):
591
"""Derived from the Avahi example code"""
592
logger.debug(u"state change: %i", state)
593
594
if state == avahi.ENTRY_GROUP_ESTABLISHED:
595
logger.debug(u"Service established.")
596
elif state == avahi.ENTRY_GROUP_COLLISION:
597
logger.warning(u"Service name collision.")
598
service.rename()
599
elif state == avahi.ENTRY_GROUP_FAILURE:
600
logger.critical(u"Error in group state changed %s",
601
unicode(error))
602
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.args))
1618
timevalue += delta
1619
return timevalue
1620
603
1621
604
1622
def if_nametoindex(interface):
605
"""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."""
606
1626
global if_nametoindex
607
1627
try:
608
if "ctypes.util" not in sys.modules:
609
import ctypes.util
610
if_nametoindex = ctypes.cdll.LoadLibrary\
611
(ctypes.util.find_library("c")).if_nametoindex
1628
if_nametoindex = (ctypes.cdll.LoadLibrary
1629
(ctypes.util.find_library("c"))
1630
.if_nametoindex)
612
1631
except (OSError, AttributeError):
613
if "struct" not in sys.modules:
614
import struct
615
if "fcntl" not in sys.modules:
616
import fcntl
1632
logger.warning("Doing if_nametoindex the hard way")
617
1633
def if_nametoindex(interface):
618
1634
"Get an interface index the hard way, i.e. using fcntl()"
619
1635
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
620
s = socket.socket()
621
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
622
struct.pack("16s16x", interface))
623
s.close()
624
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]
625
1642
return interface_index
626
1643
return if_nametoindex(interface)
627
1644
628
1645
629
1646
def daemon(nochdir = False, noclose = False):
630
1647
"""See daemon(3). Standard BSD Unix function.
1648
631
1649
This should really exist as os.daemon, but it doesn't (yet)."""
632
1650
if os.fork():
633
1651
sys.exit()
641
1659
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
642
1660
if not stat.S_ISCHR(os.fstat(null).st_mode):
643
1661
raise OSError(errno.ENODEV,
644
"/dev/null not a character device")
1662
"%s not a character device"
1663
% os.path.devnull)
645
1664
os.dup2(null, sys.stdin.fileno())
646
1665
os.dup2(null, sys.stdout.fileno())
647
1666
os.dup2(null, sys.stderr.fileno())
650
1669
651
1670
652
1671
def main():
653
global main_loop_started
654
main_loop_started = False
655
656
parser = OptionParser()
657
parser.add_option("-i", "--interface", type="string",
658
metavar="IF", help="Bind to interface IF")
659
parser.add_option("-a", "--address", type="string",
660
help="Address to listen for requests on")
661
parser.add_option("-p", "--port", type="int",
662
help="Port number to receive requests on")
663
parser.add_option("--check", action="store_true", default=False,
664
help="Run self-test")
665
parser.add_option("--debug", action="store_true",
666
help="Debug mode; run in foreground and log to"
667
" terminal")
668
parser.add_option("--priority", type="string", help="GnuTLS"
669
" priority string (see GnuTLS documentation)")
670
parser.add_option("--servicename", type="string", metavar="NAME",
671
help="Zeroconf service name")
672
parser.add_option("--configdir", type="string",
673
default="/etc/mandos", metavar="DIR",
674
help="Directory to search for configuration"
675
" files")
676
(options, args) = parser.parse_args()
1672
1673
##################################################################
1674
# Parsing of options, both command line and config file
1675
1676
parser = argparse.ArgumentParser()
1677
parser.add_argument("-v", "--version", action="version",
1678
version = "%%(prog)s %s" % version,
1679
help="show version number and exit")
1680
parser.add_argument("-i", "--interface", metavar="IF",
1681
help="Bind to interface IF")
1682
parser.add_argument("-a", "--address",
1683
help="Address to listen for requests on")
1684
parser.add_argument("-p", "--port", type=int,
1685
help="Port number to receive requests on")
1686
parser.add_argument("--check", action="store_true",
1687
help="Run self-test")
1688
parser.add_argument("--debug", action="store_true",
1689
help="Debug mode; run in foreground and log"
1690
" to terminal")
1691
parser.add_argument("--debuglevel", metavar="LEVEL",
1692
help="Debug level for stdout output")
1693
parser.add_argument("--priority", help="GnuTLS"
1694
" priority string (see GnuTLS documentation)")
1695
parser.add_argument("--servicename",
1696
metavar="NAME", help="Zeroconf service name")
1697
parser.add_argument("--configdir",
1698
default="/etc/mandos", metavar="DIR",
1699
help="Directory to search for configuration"
1700
" files")
1701
parser.add_argument("--no-dbus", action="store_false",
1702
dest="use_dbus", help="Do not provide D-Bus"
1703
" system bus interface")
1704
parser.add_argument("--no-ipv6", action="store_false",
1705
dest="use_ipv6", help="Do not use IPv6")
1706
options = parser.parse_args()
677
1707
678
1708
if options.check:
679
1709
import doctest
688
1718
"priority":
689
1719
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
690
1720
"servicename": "Mandos",
1721
"use_dbus": "True",
1722
"use_ipv6": "True",
1723
"debuglevel": "",
691
1724
}
692
1725
693
1726
# Parse config file for server-global settings
694
server_config = ConfigParser.SafeConfigParser(server_defaults)
1727
server_config = configparser.SafeConfigParser(server_defaults)
695
1728
del server_defaults
696
server_config.read(os.path.join(options.configdir, "mandos.conf"))
697
server_section = "server"
1729
server_config.read(os.path.join(options.configdir,
1730
"mandos.conf"))
698
1731
# Convert the SafeConfigParser object to a dict
699
server_settings = dict(server_config.items(server_section))
700
# Use getboolean on the boolean config option
701
server_settings["debug"] = server_config.getboolean\
702
(server_section, "debug")
1732
server_settings = server_config.defaults()
1733
# Use the appropriate methods on the non-string config options
1734
for option in ("debug", "use_dbus", "use_ipv6"):
1735
server_settings[option] = server_config.getboolean("DEFAULT",
1736
option)
1737
if server_settings["port"]:
1738
server_settings["port"] = server_config.getint("DEFAULT",
1739
"port")
703
1740
del server_config
704
1741
705
1742
# Override the settings from the config file with command line
706
1743
# options, if set.
707
1744
for option in ("interface", "address", "port", "debug",
708
"priority", "servicename", "configdir"):
1745
"priority", "servicename", "configdir",
1746
"use_dbus", "use_ipv6", "debuglevel"):
709
1747
value = getattr(options, option)
710
1748
if value is not None:
711
1749
server_settings[option] = value
712
1750
del options
1751
# Force all strings to be unicode
1752
for option in server_settings.keys():
1753
if type(server_settings[option]) is str:
1754
server_settings[option] = unicode(server_settings[option])
713
1755
# Now we have our good server settings in "server_settings"
714
1756
1757
##################################################################
1758
1759
# For convenience
715
1760
debug = server_settings["debug"]
716
717
if not debug:
718
syslogger.setLevel(logging.WARNING)
719
1761
debuglevel = server_settings["debuglevel"]
1762
use_dbus = server_settings["use_dbus"]
1763
use_ipv6 = server_settings["use_ipv6"]
1764
720
1765
if server_settings["servicename"] != "Mandos":
721
syslogger.setFormatter(logging.Formatter\
722
('Mandos (%s): %%(levelname)s:'
723
' %%(message)s'
1766
syslogger.setFormatter(logging.Formatter
1767
('Mandos (%s) [%%(process)d]:'
1768
' %%(levelname)s: %%(message)s'
724
1769
% server_settings["servicename"]))
725
1770
726
1771
# Parse config file with clients
727
1772
client_defaults = { "timeout": "1h",
728
1773
"interval": "5m",
729
1774
"checker": "fping -q -- %%(host)s",
1775
"host": "",
1776
"approval_delay": "0s",
1777
"approval_duration": "1s",
730
1778
}
731
client_config = ConfigParser.SafeConfigParser(client_defaults)
1779
client_config = configparser.SafeConfigParser(client_defaults)
732
1780
client_config.read(os.path.join(server_settings["configdir"],
733
1781
"clients.conf"))
734
1782
735
global service
736
service = AvahiService(name = server_settings["servicename"],
737
type = "_mandos._tcp", );
738
if server_settings["interface"]:
739
service.interface = if_nametoindex(server_settings["interface"])
1783
global mandos_dbus_service
1784
mandos_dbus_service = None
1785
1786
tcp_server = MandosServer((server_settings["address"],
1787
server_settings["port"]),
1788
ClientHandler,
1789
interface=(server_settings["interface"]
1790
or None),
1791
use_ipv6=use_ipv6,
1792
gnutls_priority=
1793
server_settings["priority"],
1794
use_dbus=use_dbus)
1795
if not debug:
1796
pidfilename = "/var/run/mandos.pid"
1797
try:
1798
pidfile = open(pidfilename, "w")
1799
except IOError:
1800
logger.error("Could not open file %r", pidfilename)
1801
1802
try:
1803
uid = pwd.getpwnam("_mandos").pw_uid
1804
gid = pwd.getpwnam("_mandos").pw_gid
1805
except KeyError:
1806
try:
1807
uid = pwd.getpwnam("mandos").pw_uid
1808
gid = pwd.getpwnam("mandos").pw_gid
1809
except KeyError:
1810
try:
1811
uid = pwd.getpwnam("nobody").pw_uid
1812
gid = pwd.getpwnam("nobody").pw_gid
1813
except KeyError:
1814
uid = 65534
1815
gid = 65534
1816
try:
1817
os.setgid(gid)
1818
os.setuid(uid)
1819
except OSError, error:
1820
if error[0] != errno.EPERM:
1821
raise error
1822
1823
if not debug and not debuglevel:
1824
syslogger.setLevel(logging.WARNING)
1825
console.setLevel(logging.WARNING)
1826
if debuglevel:
1827
level = getattr(logging, debuglevel.upper())
1828
syslogger.setLevel(level)
1829
console.setLevel(level)
1830
1831
if debug:
1832
# Enable all possible GnuTLS debugging
1833
1834
# "Use a log level over 10 to enable all debugging options."
1835
# - GnuTLS manual
1836
gnutls.library.functions.gnutls_global_set_log_level(11)
1837
1838
@gnutls.library.types.gnutls_log_func
1839
def debug_gnutls(level, string):
1840
logger.debug("GnuTLS: %s", string[:-1])
1841
1842
(gnutls.library.functions
1843
.gnutls_global_set_log_function(debug_gnutls))
1844
1845
# Redirect stdin so all checkers get /dev/null
1846
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1847
os.dup2(null, sys.stdin.fileno())
1848
if null > 2:
1849
os.close(null)
1850
else:
1851
# No console logging
1852
logger.removeHandler(console)
1853
1854
# Need to fork before connecting to D-Bus
1855
if not debug:
1856
# Close all input and output, do double fork, etc.
1857
daemon()
740
1858
741
1859
global main_loop
742
global bus
743
global server
744
1860
# From the Avahi example code
745
1861
DBusGMainLoop(set_as_default=True )
746
1862
main_loop = gobject.MainLoop()
747
1863
bus = dbus.SystemBus()
748
server = dbus.Interface(
749
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
750
avahi.DBUS_INTERFACE_SERVER )
751
1864
# End of Avahi example code
752
753
if debug:
754
console = logging.StreamHandler()
755
# console.setLevel(logging.DEBUG)
756
console.setFormatter(logging.Formatter\
757
('%(levelname)s: %(message)s'))
758
logger.addHandler(console)
759
del console
760
761
clients = Set()
762
def remove_from_clients(client):
763
clients.remove(client)
764
if not clients:
765
logger.critical(u"No clients left, exiting")
766
sys.exit()
767
768
clients.update(Set(Client(name = section,
769
stop_hook = remove_from_clients,
770
config
771
= dict(client_config.items(section)))
772
for section in client_config.sections()))
773
if not clients:
774
logger.critical(u"No clients defined")
775
sys.exit(1)
776
1865
if use_dbus:
1866
try:
1867
bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1868
bus, do_not_queue=True)
1869
except dbus.exceptions.NameExistsException, e:
1870
logger.error(unicode(e) + ", disabling D-Bus")
1871
use_dbus = False
1872
server_settings["use_dbus"] = False
1873
tcp_server.use_dbus = False
1874
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1875
service = AvahiService(name = server_settings["servicename"],
1876
servicetype = "_mandos._tcp",
1877
protocol = protocol, bus = bus)
1878
if server_settings["interface"]:
1879
service.interface = (if_nametoindex
1880
(str(server_settings["interface"])))
1881
1882
global multiprocessing_manager
1883
multiprocessing_manager = multiprocessing.Manager()
1884
1885
client_class = Client
1886
if use_dbus:
1887
client_class = functools.partial(ClientDBus, bus = bus)
1888
def client_config_items(config, section):
1889
special_settings = {
1890
"approved_by_default":
1891
lambda: config.getboolean(section,
1892
"approved_by_default"),
1893
}
1894
for name, value in config.items(section):
1895
try:
1896
yield (name, special_settings[name]())
1897
except KeyError:
1898
yield (name, value)
1899
1900
tcp_server.clients.update(set(
1901
client_class(name = section,
1902
config= dict(client_config_items(
1903
client_config, section)))
1904
for section in client_config.sections()))
1905
if not tcp_server.clients:
1906
logger.warning("No clients defined")
1907
777
1908
if not debug:
778
daemon()
1909
try:
1910
with pidfile:
1911
pid = os.getpid()
1912
pidfile.write(str(pid) + "\n".encode("utf-8"))
1913
del pidfile
1914
except IOError:
1915
logger.error("Could not write to file %r with PID %d",
1916
pidfilename, pid)
1917
except NameError:
1918
# "pidfile" was never created
1919
pass
1920
del pidfilename
1921
1922
signal.signal(signal.SIGINT, signal.SIG_IGN)
1923
1924
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1925
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
779
1926
780
pidfilename = "/var/run/mandos/mandos.pid"
781
pid = os.getpid()
782
try:
783
pidfile = open(pidfilename, "w")
784
pidfile.write(str(pid) + "\n")
785
pidfile.close()
786
del pidfile
787
except IOError, err:
788
logger.error(u"Could not write %s file with PID %d",
789
pidfilename, os.getpid())
1927
if use_dbus:
1928
class MandosDBusService(dbus.service.Object):
1929
"""A D-Bus proxy object"""
1930
def __init__(self):
1931
dbus.service.Object.__init__(self, bus, "/")
1932
_interface = "se.bsnet.fukt.Mandos"
1933
1934
@dbus.service.signal(_interface, signature="o")
1935
def ClientAdded(self, objpath):
1936
"D-Bus signal"
1937
pass
1938
1939
@dbus.service.signal(_interface, signature="ss")
1940
def ClientNotFound(self, fingerprint, address):
1941
"D-Bus signal"
1942
pass
1943
1944
@dbus.service.signal(_interface, signature="os")
1945
def ClientRemoved(self, objpath, name):
1946
"D-Bus signal"
1947
pass
1948
1949
@dbus.service.method(_interface, out_signature="ao")
1950
def GetAllClients(self):
1951
"D-Bus method"
1952
return dbus.Array(c.dbus_object_path
1953
for c in tcp_server.clients)
1954
1955
@dbus.service.method(_interface,
1956
out_signature="a{oa{sv}}")
1957
def GetAllClientsWithProperties(self):
1958
"D-Bus method"
1959
return dbus.Dictionary(
1960
((c.dbus_object_path, c.GetAll(""))
1961
for c in tcp_server.clients),
1962
signature="oa{sv}")
1963
1964
@dbus.service.method(_interface, in_signature="o")
1965
def RemoveClient(self, object_path):
1966
"D-Bus method"
1967
for c in tcp_server.clients:
1968
if c.dbus_object_path == object_path:
1969
tcp_server.clients.remove(c)
1970
c.remove_from_connection()
1971
# Don't signal anything except ClientRemoved
1972
c.disable(quiet=True)
1973
# Emit D-Bus signal
1974
self.ClientRemoved(object_path, c.name)
1975
return
1976
raise KeyError(object_path)
1977
1978
del _interface
1979
1980
mandos_dbus_service = MandosDBusService()
790
1981
791
1982
def cleanup():
792
1983
"Cleanup function; run on exit"
793
global group
794
# From the Avahi example code
795
if not group is None:
796
group.Free()
797
group = None
798
# End of Avahi example code
1984
service.cleanup()
799
1985
800
while clients:
801
client = clients.pop()
802
client.stop_hook = None
803
client.stop()
1986
while tcp_server.clients:
1987
client = tcp_server.clients.pop()
1988
if use_dbus:
1989
client.remove_from_connection()
1990
client.disable_hook = None
1991
# Don't signal anything except ClientRemoved
1992
client.disable(quiet=True)
1993
if use_dbus:
1994
# Emit D-Bus signal
1995
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1996
client.name)
804
1997
805
1998
atexit.register(cleanup)
806
1999
807
if not debug:
808
signal.signal(signal.SIGINT, signal.SIG_IGN)
809
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
810
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
811
812
for client in clients:
813
client.start()
814
815
tcp_server = IPv6_TCPServer((server_settings["address"],
816
server_settings["port"]),
817
tcp_handler,
818
settings=server_settings,
819
clients=clients)
2000
for client in tcp_server.clients:
2001
if use_dbus:
2002
# Emit D-Bus signal
2003
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2004
client.enable()
2005
2006
tcp_server.enable()
2007
tcp_server.server_activate()
2008
820
2009
# Find out what port we got
821
2010
service.port = tcp_server.socket.getsockname()[1]
822
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
823
u" scope_id %d" % tcp_server.socket.getsockname())
2011
if use_ipv6:
2012
logger.info("Now listening on address %r, port %d,"
2013
" flowinfo %d, scope_id %d"
2014
% tcp_server.socket.getsockname())
2015
else: # IPv4
2016
logger.info("Now listening on address %r, port %d"
2017
% tcp_server.socket.getsockname())
824
2018
825
2019
#service.interface = tcp_server.socket.getsockname()[3]
826
2020
827
2021
try:
828
2022
# From the Avahi example code
829
server.connect_to_signal("StateChanged", server_state_changed)
830
2023
try:
831
server_state_changed(server.GetState())
2024
service.activate()
832
2025
except dbus.exceptions.DBusException, error:
833
logger.critical(u"DBusException: %s", error)
2026
logger.critical("DBusException: %s", error)
2027
cleanup()
834
2028
sys.exit(1)
835
2029
# End of Avahi example code
836
2030
837
2031
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
838
2032
lambda *args, **kwargs:
839
tcp_server.handle_request\
840
(*args[2:], **kwargs) or True)
2033
(tcp_server.handle_request
2034
(*args[2:], **kwargs) or True))
841
2035
842
logger.debug(u"Starting main loop")
843
main_loop_started = True
2036
logger.debug("Starting main loop")
844
2037
main_loop.run()
845
2038
except AvahiError, error:
846
logger.critical(u"AvahiError: %s" + unicode(error))
2039
logger.critical("AvahiError: %s", error)
2040
cleanup()
847
2041
sys.exit(1)
848
2042
except KeyboardInterrupt:
849
2043
if debug:
850
print
2044
print("", file=sys.stderr)
2045
logger.debug("Server received KeyboardInterrupt")
2046
logger.debug("Server exiting")
2047
# Must run before the D-Bus bus name gets deregistered
2048
cleanup()
851
2049
852
2050
if __name__ == '__main__':
853
2051
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0