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- Committer: Teddy Hogeborn
- Date: 2012-05-06 16:13:00 UTC
- Revision ID: teddy@recompile.se-20120506161300-43rls2rr4qub3zhw
* mandos: Use a class decorator instead of a metaclass to provide
alternate D-Bus interface names on D-Bus object attributes.
(alternate_dbus_interfaces): New class decorator.
(AlternateDBusNamesMetaclass, ClientDBusTransitional,
MandosDBusServiceTransitional): Removed; all users changed.
(ClientDbus, MandosDBusService): Use new "alternate_dbus_interfaces"
class decorator.
alternate D-Bus interface names on D-Bus object attributes.
(alternate_dbus_interfaces): New class decorator.
(AlternateDBusNamesMetaclass, ClientDBusTransitional,
MandosDBusServiceTransitional): Removed; all users changed.
(ClientDbus, MandosDBusService): Use new "alternate_dbus_interfaces"
class decorator.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- network-hooks.d
- 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 © 2008-2012 Teddy Hogeborn
15
# Copyright © 2008-2012 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
#
29
# Contact the authors at <mandos@fukt.bsnet.se>.
30
#
31
32
from __future__ import division
33
34
import SocketServer
28
# along with this program. If not, see
29
# <http://www.gnu.org/licenses/>.
30
#
31
# Contact the authors at <mandos@recompile.se>.
32
#
33
34
from __future__ import (division, absolute_import, print_function,
35
unicode_literals)
36
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
65
import types
66
import binascii
67
import tempfile
68
import itertools
57
69
58
70
import dbus
71
import dbus.service
59
72
import gobject
60
73
import avahi
61
74
from dbus.mainloop.glib import DBusGMainLoop
62
75
import ctypes
63
64
version = "1.0"
65
66
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'))
72
logger.addHandler(syslogger)
73
74
console = logging.StreamHandler()
75
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
' %(message)s'))
77
logger.addHandler(console)
76
import ctypes.util
77
import xml.dom.minidom
78
import inspect
79
import GnuPGInterface
80
81
try:
82
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
83
except AttributeError:
84
try:
85
from IN import SO_BINDTODEVICE
86
except ImportError:
87
SO_BINDTODEVICE = None
88
89
version = "1.5.3"
90
stored_state_file = "clients.pickle"
91
92
logger = logging.getLogger()
93
syslogger = (logging.handlers.SysLogHandler
94
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
95
address = str("/dev/log")))
96
97
try:
98
if_nametoindex = (ctypes.cdll.LoadLibrary
99
(ctypes.util.find_library("c"))
100
.if_nametoindex)
101
except (OSError, AttributeError):
102
def if_nametoindex(interface):
103
"Get an interface index the hard way, i.e. using fcntl()"
104
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
105
with contextlib.closing(socket.socket()) as s:
106
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
107
struct.pack(str("16s16x"),
108
interface))
109
interface_index = struct.unpack(str("I"),
110
ifreq[16:20])[0]
111
return interface_index
112
113
114
def initlogger(debug, level=logging.WARNING):
115
"""init logger and add loglevel"""
116
117
syslogger.setFormatter(logging.Formatter
118
('Mandos [%(process)d]: %(levelname)s:'
119
' %(message)s'))
120
logger.addHandler(syslogger)
121
122
if debug:
123
console = logging.StreamHandler()
124
console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
125
' [%(process)d]:'
126
' %(levelname)s:'
127
' %(message)s'))
128
logger.addHandler(console)
129
logger.setLevel(level)
130
131
132
class PGPError(Exception):
133
"""Exception if encryption/decryption fails"""
134
pass
135
136
137
class PGPEngine(object):
138
"""A simple class for OpenPGP symmetric encryption & decryption"""
139
def __init__(self):
140
self.gnupg = GnuPGInterface.GnuPG()
141
self.tempdir = tempfile.mkdtemp(prefix="mandos-")
142
self.gnupg = GnuPGInterface.GnuPG()
143
self.gnupg.options.meta_interactive = False
144
self.gnupg.options.homedir = self.tempdir
145
self.gnupg.options.extra_args.extend(['--force-mdc',
146
'--quiet',
147
'--no-use-agent'])
148
149
def __enter__(self):
150
return self
151
152
def __exit__ (self, exc_type, exc_value, traceback):
153
self._cleanup()
154
return False
155
156
def __del__(self):
157
self._cleanup()
158
159
def _cleanup(self):
160
if self.tempdir is not None:
161
# Delete contents of tempdir
162
for root, dirs, files in os.walk(self.tempdir,
163
topdown = False):
164
for filename in files:
165
os.remove(os.path.join(root, filename))
166
for dirname in dirs:
167
os.rmdir(os.path.join(root, dirname))
168
# Remove tempdir
169
os.rmdir(self.tempdir)
170
self.tempdir = None
171
172
def password_encode(self, password):
173
# Passphrase can not be empty and can not contain newlines or
174
# NUL bytes. So we prefix it and hex encode it.
175
return b"mandos" + binascii.hexlify(password)
176
177
def encrypt(self, data, password):
178
self.gnupg.passphrase = self.password_encode(password)
179
with open(os.devnull, "w") as devnull:
180
try:
181
proc = self.gnupg.run(['--symmetric'],
182
create_fhs=['stdin', 'stdout'],
183
attach_fhs={'stderr': devnull})
184
with contextlib.closing(proc.handles['stdin']) as f:
185
f.write(data)
186
with contextlib.closing(proc.handles['stdout']) as f:
187
ciphertext = f.read()
188
proc.wait()
189
except IOError as e:
190
raise PGPError(e)
191
self.gnupg.passphrase = None
192
return ciphertext
193
194
def decrypt(self, data, password):
195
self.gnupg.passphrase = self.password_encode(password)
196
with open(os.devnull, "w") as devnull:
197
try:
198
proc = self.gnupg.run(['--decrypt'],
199
create_fhs=['stdin', 'stdout'],
200
attach_fhs={'stderr': devnull})
201
with contextlib.closing(proc.handles['stdin']) as f:
202
f.write(data)
203
with contextlib.closing(proc.handles['stdout']) as f:
204
decrypted_plaintext = f.read()
205
proc.wait()
206
except IOError as e:
207
raise PGPError(e)
208
self.gnupg.passphrase = None
209
return decrypted_plaintext
210
78
211
79
212
class AvahiError(Exception):
80
def __init__(self, value):
213
def __init__(self, value, *args, **kwargs):
81
214
self.value = value
82
def __str__(self):
83
return repr(self.value)
215
super(AvahiError, self).__init__(value, *args, **kwargs)
216
def __unicode__(self):
217
return unicode(repr(self.value))
84
218
85
219
class AvahiServiceError(AvahiError):
86
220
pass
91
225
92
226
class AvahiService(object):
93
227
"""An Avahi (Zeroconf) service.
228
94
229
Attributes:
95
230
interface: integer; avahi.IF_UNSPEC or an interface index.
96
231
Used to optionally bind to the specified interface.
104
239
max_renames: integer; maximum number of renames
105
240
rename_count: integer; counter so we only rename after collisions
106
241
a sensible number of times
242
group: D-Bus Entry Group
243
server: D-Bus Server
244
bus: dbus.SystemBus()
107
245
"""
246
108
247
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
type = None, port = None, TXT = None, domain = "",
110
host = "", max_renames = 32768):
248
servicetype = None, port = None, TXT = None,
249
domain = "", host = "", max_renames = 32768,
250
protocol = avahi.PROTO_UNSPEC, bus = None):
111
251
self.interface = interface
112
252
self.name = name
113
self.type = type
253
self.type = servicetype
114
254
self.port = port
115
if TXT is None:
116
self.TXT = []
117
else:
118
self.TXT = TXT
255
self.TXT = TXT if TXT is not None else []
119
256
self.domain = domain
120
257
self.host = host
121
258
self.rename_count = 0
259
self.max_renames = max_renames
260
self.protocol = protocol
261
self.group = None # our entry group
262
self.server = None
263
self.bus = bus
264
self.entry_group_state_changed_match = None
265
122
266
def rename(self):
123
267
"""Derived from the Avahi example code"""
124
268
if self.rename_count >= self.max_renames:
125
logger.critical(u"No suitable service name found after %i"
126
u" retries, exiting.", rename_count)
269
logger.critical("No suitable Zeroconf service name found"
270
" after %i retries, exiting.",
271
self.rename_count)
127
272
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))
273
self.name = unicode(self.server
274
.GetAlternativeServiceName(self.name))
275
logger.info("Changing Zeroconf service name to %r ...",
276
self.name)
133
277
self.remove()
134
self.add()
278
try:
279
self.add()
280
except dbus.exceptions.DBusException as error:
281
logger.critical("D-Bus Exception", exc_info=error)
282
self.cleanup()
283
os._exit(1)
135
284
self.rename_count += 1
285
136
286
def remove(self):
137
287
"""Derived from the Avahi example code"""
138
if group is not None:
139
group.Reset()
288
if self.entry_group_state_changed_match is not None:
289
self.entry_group_state_changed_match.remove()
290
self.entry_group_state_changed_match = None
291
if self.group is not None:
292
self.group.Reset()
293
140
294
def add(self):
141
295
"""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
165
296
self.remove()
297
if self.group is None:
298
self.group = dbus.Interface(
299
self.bus.get_object(avahi.DBUS_NAME,
300
self.server.EntryGroupNew()),
301
avahi.DBUS_INTERFACE_ENTRY_GROUP)
302
self.entry_group_state_changed_match = (
303
self.group.connect_to_signal(
304
'StateChanged', self.entry_group_state_changed))
305
logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
306
self.name, self.type)
307
self.group.AddService(
308
self.interface,
309
self.protocol,
310
dbus.UInt32(0), # flags
311
self.name, self.type,
312
self.domain, self.host,
313
dbus.UInt16(self.port),
314
avahi.string_array_to_txt_array(self.TXT))
315
self.group.Commit()
316
317
def entry_group_state_changed(self, state, error):
318
"""Derived from the Avahi example code"""
319
logger.debug("Avahi entry group state change: %i", state)
320
321
if state == avahi.ENTRY_GROUP_ESTABLISHED:
322
logger.debug("Zeroconf service established.")
323
elif state == avahi.ENTRY_GROUP_COLLISION:
324
logger.info("Zeroconf service name collision.")
325
self.rename()
326
elif state == avahi.ENTRY_GROUP_FAILURE:
327
logger.critical("Avahi: Error in group state changed %s",
328
unicode(error))
329
raise AvahiGroupError("State changed: {0!s}"
330
.format(error))
331
332
def cleanup(self):
333
"""Derived from the Avahi example code"""
334
if self.group is not None:
335
try:
336
self.group.Free()
337
except (dbus.exceptions.UnknownMethodException,
338
dbus.exceptions.DBusException):
339
pass
340
self.group = None
341
self.remove()
342
343
def server_state_changed(self, state, error=None):
344
"""Derived from the Avahi example code"""
345
logger.debug("Avahi server state change: %i", state)
346
bad_states = { avahi.SERVER_INVALID:
347
"Zeroconf server invalid",
348
avahi.SERVER_REGISTERING: None,
349
avahi.SERVER_COLLISION:
350
"Zeroconf server name collision",
351
avahi.SERVER_FAILURE:
352
"Zeroconf server failure" }
353
if state in bad_states:
354
if bad_states[state] is not None:
355
if error is None:
356
logger.error(bad_states[state])
357
else:
358
logger.error(bad_states[state] + ": %r", error)
359
self.cleanup()
360
elif state == avahi.SERVER_RUNNING:
361
self.add()
362
else:
363
if error is None:
364
logger.debug("Unknown state: %r", state)
365
else:
366
logger.debug("Unknown state: %r: %r", state, error)
367
368
def activate(self):
369
"""Derived from the Avahi example code"""
370
if self.server is None:
371
self.server = dbus.Interface(
372
self.bus.get_object(avahi.DBUS_NAME,
373
avahi.DBUS_PATH_SERVER,
374
follow_name_owner_changes=True),
375
avahi.DBUS_INTERFACE_SERVER)
376
self.server.connect_to_signal("StateChanged",
377
self.server_state_changed)
378
self.server_state_changed(self.server.GetState())
379
380
class AvahiServiceToSyslog(AvahiService):
381
def rename(self):
382
"""Add the new name to the syslog messages"""
383
ret = AvahiService.rename(self)
384
syslogger.setFormatter(logging.Formatter
385
('Mandos ({0}) [%(process)d]:'
386
' %(levelname)s: %(message)s'
387
.format(self.name)))
388
return ret
389
390
def timedelta_to_milliseconds(td):
391
"Convert a datetime.timedelta() to milliseconds"
392
return ((td.days * 24 * 60 * 60 * 1000)
393
+ (td.seconds * 1000)
394
+ (td.microseconds // 1000))
166
395
167
396
class Client(object):
168
397
"""A representation of a client host served by this server.
398
169
399
Attributes:
170
name: string; from the config file, used in log messages
400
approved: bool(); 'None' if not yet approved/disapproved
401
approval_delay: datetime.timedelta(); Time to wait for approval
402
approval_duration: datetime.timedelta(); Duration of one approval
403
checker: subprocess.Popen(); a running checker process used
404
to see if the client lives.
405
'None' if no process is running.
406
checker_callback_tag: a gobject event source tag, or None
407
checker_command: string; External command which is run to check
408
if client lives. %() expansions are done at
409
runtime with vars(self) as dict, so that for
410
instance %(name)s can be used in the command.
411
checker_initiator_tag: a gobject event source tag, or None
412
created: datetime.datetime(); (UTC) object creation
413
client_structure: Object describing what attributes a client has
414
and is used for storing the client at exit
415
current_checker_command: string; current running checker_command
416
disable_initiator_tag: a gobject event source tag, or None
417
enabled: bool()
171
418
fingerprint: string (40 or 32 hexadecimal digits); used to
172
419
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: - '' -
420
host: string; available for use by the checker command
421
interval: datetime.timedelta(); How often to start a new checker
422
last_approval_request: datetime.datetime(); (UTC) or None
423
last_checked_ok: datetime.datetime(); (UTC) or None
424
last_checker_status: integer between 0 and 255 reflecting exit
425
status of last checker. -1 reflects crashed
426
checker, -2 means no checker completed yet.
427
last_enabled: datetime.datetime(); (UTC) or None
428
name: string; from the config file, used in log messages and
429
D-Bus identifiers
430
secret: bytestring; sent verbatim (over TLS) to client
431
timeout: datetime.timedelta(); How long from last_checked_ok
432
until this client is disabled
433
extended_timeout: extra long timeout when secret has been sent
434
runtime_expansions: Allowed attributes for runtime expansion.
435
expires: datetime.datetime(); time (UTC) when a client will be
436
disabled, or None
196
437
"""
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={}):
221
"""Note: the 'checker' key in 'config' sets the
222
'checker_command' attribute and *not* the 'checker'
223
attribute."""
438
439
runtime_expansions = ("approval_delay", "approval_duration",
440
"created", "enabled", "fingerprint",
441
"host", "interval", "last_checked_ok",
442
"last_enabled", "name", "timeout")
443
client_defaults = { "timeout": "5m",
444
"extended_timeout": "15m",
445
"interval": "2m",
446
"checker": "fping -q -- %%(host)s",
447
"host": "",
448
"approval_delay": "0s",
449
"approval_duration": "1s",
450
"approved_by_default": "True",
451
"enabled": "True",
452
}
453
454
def timeout_milliseconds(self):
455
"Return the 'timeout' attribute in milliseconds"
456
return timedelta_to_milliseconds(self.timeout)
457
458
def extended_timeout_milliseconds(self):
459
"Return the 'extended_timeout' attribute in milliseconds"
460
return timedelta_to_milliseconds(self.extended_timeout)
461
462
def interval_milliseconds(self):
463
"Return the 'interval' attribute in milliseconds"
464
return timedelta_to_milliseconds(self.interval)
465
466
def approval_delay_milliseconds(self):
467
return timedelta_to_milliseconds(self.approval_delay)
468
469
@staticmethod
470
def config_parser(config):
471
"""Construct a new dict of client settings of this form:
472
{ client_name: {setting_name: value, ...}, ...}
473
with exceptions for any special settings as defined above.
474
NOTE: Must be a pure function. Must return the same result
475
value given the same arguments.
476
"""
477
settings = {}
478
for client_name in config.sections():
479
section = dict(config.items(client_name))
480
client = settings[client_name] = {}
481
482
client["host"] = section["host"]
483
# Reformat values from string types to Python types
484
client["approved_by_default"] = config.getboolean(
485
client_name, "approved_by_default")
486
client["enabled"] = config.getboolean(client_name,
487
"enabled")
488
489
client["fingerprint"] = (section["fingerprint"].upper()
490
.replace(" ", ""))
491
if "secret" in section:
492
client["secret"] = section["secret"].decode("base64")
493
elif "secfile" in section:
494
with open(os.path.expanduser(os.path.expandvars
495
(section["secfile"])),
496
"rb") as secfile:
497
client["secret"] = secfile.read()
498
else:
499
raise TypeError("No secret or secfile for section {0}"
500
.format(section))
501
client["timeout"] = string_to_delta(section["timeout"])
502
client["extended_timeout"] = string_to_delta(
503
section["extended_timeout"])
504
client["interval"] = string_to_delta(section["interval"])
505
client["approval_delay"] = string_to_delta(
506
section["approval_delay"])
507
client["approval_duration"] = string_to_delta(
508
section["approval_duration"])
509
client["checker_command"] = section["checker"]
510
client["last_approval_request"] = None
511
client["last_checked_ok"] = None
512
client["last_checker_status"] = -2
513
514
return settings
515
516
def __init__(self, settings, name = None):
224
517
self.name = name
225
logger.debug(u"Creating client %r", self.name)
518
# adding all client settings
519
for setting, value in settings.iteritems():
520
setattr(self, setting, value)
521
522
if self.enabled:
523
if not hasattr(self, "last_enabled"):
524
self.last_enabled = datetime.datetime.utcnow()
525
if not hasattr(self, "expires"):
526
self.expires = (datetime.datetime.utcnow()
527
+ self.timeout)
528
else:
529
self.last_enabled = None
530
self.expires = None
531
532
logger.debug("Creating client %r", self.name)
226
533
# Uppercase and remove spaces from fingerprint for later
227
534
# comparison purposes with return value from the fingerprint()
228
535
# function
229
self.fingerprint = config["fingerprint"].upper()\
230
.replace(u" ", u"")
231
logger.debug(u" Fingerprint: %s", self.fingerprint)
232
if "secret" in config:
233
self.secret = config["secret"].decode(u"base64")
234
elif "secfile" in config:
235
sf = open(config["secfile"])
236
self.secret = sf.read()
237
sf.close()
238
else:
239
raise TypeError(u"No secret or secfile for client %s"
240
% self.name)
241
self.host = config.get("host", "")
242
self.created = datetime.datetime.now()
243
self.last_checked_ok = None
244
self.timeout = string_to_delta(config["timeout"])
245
self.interval = string_to_delta(config["interval"])
246
self.stop_hook = stop_hook
536
logger.debug(" Fingerprint: %s", self.fingerprint)
537
self.created = settings.get("created",
538
datetime.datetime.utcnow())
539
540
# attributes specific for this server instance
247
541
self.checker = None
248
542
self.checker_initiator_tag = None
249
self.stop_initiator_tag = None
543
self.disable_initiator_tag = None
250
544
self.checker_callback_tag = None
251
self.check_command = config["checker"]
252
def start(self):
545
self.current_checker_command = None
546
self.approved = None
547
self.approvals_pending = 0
548
self.changedstate = (multiprocessing_manager
549
.Condition(multiprocessing_manager
550
.Lock()))
551
self.client_structure = [attr for attr in
552
self.__dict__.iterkeys()
553
if not attr.startswith("_")]
554
self.client_structure.append("client_structure")
555
556
for name, t in inspect.getmembers(type(self),
557
lambda obj:
558
isinstance(obj,
559
property)):
560
if not name.startswith("_"):
561
self.client_structure.append(name)
562
563
# Send notice to process children that client state has changed
564
def send_changedstate(self):
565
with self.changedstate:
566
self.changedstate.notify_all()
567
568
def enable(self):
253
569
"""Start this client's checker and timeout hooks"""
570
if getattr(self, "enabled", False):
571
# Already enabled
572
return
573
self.send_changedstate()
574
self.expires = datetime.datetime.utcnow() + self.timeout
575
self.enabled = True
576
self.last_enabled = datetime.datetime.utcnow()
577
self.init_checker()
578
579
def disable(self, quiet=True):
580
"""Disable this client."""
581
if not getattr(self, "enabled", False):
582
return False
583
if not quiet:
584
self.send_changedstate()
585
if not quiet:
586
logger.info("Disabling client %s", self.name)
587
if getattr(self, "disable_initiator_tag", False):
588
gobject.source_remove(self.disable_initiator_tag)
589
self.disable_initiator_tag = None
590
self.expires = None
591
if getattr(self, "checker_initiator_tag", False):
592
gobject.source_remove(self.checker_initiator_tag)
593
self.checker_initiator_tag = None
594
self.stop_checker()
595
self.enabled = False
596
# Do not run this again if called by a gobject.timeout_add
597
return False
598
599
def __del__(self):
600
self.disable()
601
602
def init_checker(self):
254
603
# Schedule a new checker to be started an 'interval' from now,
255
604
# and every interval from then on.
256
self.checker_initiator_tag = gobject.timeout_add\
257
(self._interval_milliseconds,
258
self.start_checker)
605
self.checker_initiator_tag = (gobject.timeout_add
606
(self.interval_milliseconds(),
607
self.start_checker))
608
# Schedule a disable() when 'timeout' has passed
609
self.disable_initiator_tag = (gobject.timeout_add
610
(self.timeout_milliseconds(),
611
self.disable))
259
612
# Also start a new checker *right now*.
260
613
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:
274
return False
275
if getattr(self, "stop_initiator_tag", False):
276
gobject.source_remove(self.stop_initiator_tag)
277
self.stop_initiator_tag = None
278
if getattr(self, "checker_initiator_tag", False):
279
gobject.source_remove(self.checker_initiator_tag)
280
self.checker_initiator_tag = None
281
self.stop_checker()
282
if self.stop_hook:
283
self.stop_hook(self)
284
# Do not run this again if called by a gobject.timeout_add
285
return False
286
def __del__(self):
287
self.stop_hook = None
288
self.stop()
289
def checker_callback(self, pid, condition):
614
615
def checker_callback(self, pid, condition, command):
290
616
"""The checker has completed, so take appropriate actions."""
291
now = datetime.datetime.now()
292
617
self.checker_callback_tag = None
293
618
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?",
619
if os.WIFEXITED(condition):
620
self.last_checker_status = os.WEXITSTATUS(condition)
621
if self.last_checker_status == 0:
622
logger.info("Checker for %(name)s succeeded",
623
vars(self))
624
self.checked_ok()
625
else:
626
logger.info("Checker for %(name)s failed",
627
vars(self))
628
else:
629
self.last_checker_status = -1
630
logger.warning("Checker for %(name)s crashed?",
305
631
vars(self))
306
else:
307
logger.info(u"Checker for %(name)s failed",
308
vars(self))
632
633
def checked_ok(self):
634
"""Assert that the client has been seen, alive and well."""
635
self.last_checked_ok = datetime.datetime.utcnow()
636
self.last_checker_status = 0
637
self.bump_timeout()
638
639
def bump_timeout(self, timeout=None):
640
"""Bump up the timeout for this client."""
641
if timeout is None:
642
timeout = self.timeout
643
if self.disable_initiator_tag is not None:
644
gobject.source_remove(self.disable_initiator_tag)
645
if getattr(self, "enabled", False):
646
self.disable_initiator_tag = (gobject.timeout_add
647
(timedelta_to_milliseconds
648
(timeout), self.disable))
649
self.expires = datetime.datetime.utcnow() + timeout
650
651
def need_approval(self):
652
self.last_approval_request = datetime.datetime.utcnow()
653
309
654
def start_checker(self):
310
655
"""Start a new checker subprocess if one is not running.
656
311
657
If a checker already exists, leave it running and do
312
658
nothing."""
313
659
# The reason for not killing a running checker is that if we
316
662
# client would inevitably timeout, since no checker would get
317
663
# a chance to run to completion. If we instead leave running
318
664
# 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.
665
# than 'timeout' for the client to be disabled, which is as it
666
# should be.
667
668
# If a checker exists, make sure it is not a zombie
669
try:
670
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
671
except (AttributeError, OSError) as error:
672
if (isinstance(error, OSError)
673
and error.errno != errno.ECHILD):
674
raise error
675
else:
676
if pid:
677
logger.warning("Checker was a zombie")
678
gobject.source_remove(self.checker_callback_tag)
679
self.checker_callback(pid, status,
680
self.current_checker_command)
681
# Start a new checker if needed
321
682
if self.checker is None:
322
683
try:
323
# In case check_command has exactly one % operator
324
command = self.check_command % self.host
684
# In case checker_command has exactly one % operator
685
command = self.checker_command % self.host
325
686
except TypeError:
326
687
# Escape attributes for the shell
327
escaped_attrs = dict((key, re.escape(str(val)))
328
for key, val in
329
vars(self).iteritems())
688
escaped_attrs = dict(
689
(attr,
690
re.escape(unicode(str(getattr(self, attr, "")),
691
errors=
692
'replace')))
693
for attr in
694
self.runtime_expansions)
695
330
696
try:
331
command = self.check_command % escaped_attrs
332
except TypeError, error:
333
logger.error(u'Could not format string "%s":'
334
u' %s', self.check_command, error)
697
command = self.checker_command % escaped_attrs
698
except TypeError as error:
699
logger.error('Could not format string "%s"',
700
self.checker_command, exc_info=error)
335
701
return True # Try again later
702
self.current_checker_command = command
336
703
try:
337
logger.info(u"Starting checker %r for %s",
704
logger.info("Starting checker %r for %s",
338
705
command, self.name)
706
# We don't need to redirect stdout and stderr, since
707
# in normal mode, that is already done by daemon(),
708
# and in debug mode we don't want to. (Stdin is
709
# always replaced by /dev/null.)
339
710
self.checker = subprocess.Popen(command,
340
711
close_fds=True,
341
712
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",
347
error)
713
self.checker_callback_tag = (gobject.child_watch_add
714
(self.checker.pid,
715
self.checker_callback,
716
data=command))
717
# The checker may have completed before the gobject
718
# watch was added. Check for this.
719
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
720
if pid:
721
gobject.source_remove(self.checker_callback_tag)
722
self.checker_callback(pid, status, command)
723
except OSError as error:
724
logger.error("Failed to start subprocess",
725
exc_info=error)
348
726
# Re-run this periodically if run by gobject.timeout_add
349
727
return True
728
350
729
def stop_checker(self):
351
730
"""Force the checker process, if any, to stop."""
352
731
if self.checker_callback_tag:
354
733
self.checker_callback_tag = None
355
734
if getattr(self, "checker", None) is None:
356
735
return
357
logger.debug(u"Stopping checker for %(name)s", vars(self))
736
logger.debug("Stopping checker for %(name)s", vars(self))
358
737
try:
359
os.kill(self.checker.pid, signal.SIGTERM)
360
#os.sleep(0.5)
738
self.checker.terminate()
739
#time.sleep(0.5)
361
740
#if self.checker.poll() is None:
362
# os.kill(self.checker.pid, signal.SIGKILL)
363
except OSError, error:
741
# self.checker.kill()
742
except OSError as error:
364
743
if error.errno != errno.ESRCH: # No such process
365
744
raise
366
745
self.checker = None
367
def still_valid(self):
368
"""Has the timeout not yet passed for this client?"""
369
now = datetime.datetime.now()
370
if self.last_checked_ok is None:
371
return now < (self.created + self.timeout)
372
else:
373
return now < (self.last_checked_ok + self.timeout)
374
375
376
def peer_certificate(session):
377
"Return the peer's OpenPGP certificate as a bytestring"
378
# If not an OpenPGP certificate...
379
if gnutls.library.functions.gnutls_certificate_type_get\
380
(session._c_object) \
381
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
382
# ...do the normal thing
383
return session.peer_certificate
384
list_size = ctypes.c_uint()
385
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
386
(session._c_object, ctypes.byref(list_size))
387
if list_size.value == 0:
388
return None
389
cert = cert_list[0]
390
return ctypes.string_at(cert.data, cert.size)
391
392
393
def fingerprint(openpgp):
394
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
395
# New GnuTLS "datum" with the OpenPGP public key
396
datum = gnutls.library.types.gnutls_datum_t\
397
(ctypes.cast(ctypes.c_char_p(openpgp),
398
ctypes.POINTER(ctypes.c_ubyte)),
399
ctypes.c_uint(len(openpgp)))
400
# New empty GnuTLS certificate
401
crt = gnutls.library.types.gnutls_openpgp_crt_t()
402
gnutls.library.functions.gnutls_openpgp_crt_init\
403
(ctypes.byref(crt))
404
# Import the OpenPGP public key into the certificate
405
gnutls.library.functions.gnutls_openpgp_crt_import\
406
(crt, ctypes.byref(datum),
407
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
# New buffer for the fingerprint
409
buffer = ctypes.create_string_buffer(20)
410
buffer_length = ctypes.c_size_t()
411
# Get the fingerprint from the certificate into the buffer
412
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
413
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
414
# Deinit the certificate
415
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
416
# Convert the buffer to a Python bytestring
417
fpr = ctypes.string_at(buffer, buffer_length.value)
418
# Convert the bytestring to hexadecimal notation
419
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
420
return hex_fpr
421
422
423
class tcp_handler(SocketServer.BaseRequestHandler, object):
424
"""A TCP request handler class.
425
Instantiated by IPv6_TCPServer for each request to handle it.
746
747
748
def dbus_service_property(dbus_interface, signature="v",
749
access="readwrite", byte_arrays=False):
750
"""Decorators for marking methods of a DBusObjectWithProperties to
751
become properties on the D-Bus.
752
753
The decorated method will be called with no arguments by "Get"
754
and with one argument by "Set".
755
756
The parameters, where they are supported, are the same as
757
dbus.service.method, except there is only "signature", since the
758
type from Get() and the type sent to Set() is the same.
759
"""
760
# Encoding deeply encoded byte arrays is not supported yet by the
761
# "Set" method, so we fail early here:
762
if byte_arrays and signature != "ay":
763
raise ValueError("Byte arrays not supported for non-'ay'"
764
" signature {0!r}".format(signature))
765
def decorator(func):
766
func._dbus_is_property = True
767
func._dbus_interface = dbus_interface
768
func._dbus_signature = signature
769
func._dbus_access = access
770
func._dbus_name = func.__name__
771
if func._dbus_name.endswith("_dbus_property"):
772
func._dbus_name = func._dbus_name[:-14]
773
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
774
return func
775
return decorator
776
777
778
def dbus_interface_annotations(dbus_interface):
779
"""Decorator for marking functions returning interface annotations
780
781
Usage:
782
783
@dbus_interface_annotations("org.example.Interface")
784
def _foo(self): # Function name does not matter
785
return {"org.freedesktop.DBus.Deprecated": "true",
786
"org.freedesktop.DBus.Property.EmitsChangedSignal":
787
"false"}
788
"""
789
def decorator(func):
790
func._dbus_is_interface = True
791
func._dbus_interface = dbus_interface
792
func._dbus_name = dbus_interface
793
return func
794
return decorator
795
796
797
def dbus_annotations(annotations):
798
"""Decorator to annotate D-Bus methods, signals or properties
799
Usage:
800
801
@dbus_service_property("org.example.Interface", signature="b",
802
access="r")
803
@dbus_annotations({{"org.freedesktop.DBus.Deprecated": "true",
804
"org.freedesktop.DBus.Property."
805
"EmitsChangedSignal": "false"})
806
def Property_dbus_property(self):
807
return dbus.Boolean(False)
808
"""
809
def decorator(func):
810
func._dbus_annotations = annotations
811
return func
812
return decorator
813
814
815
class DBusPropertyException(dbus.exceptions.DBusException):
816
"""A base class for D-Bus property-related exceptions
817
"""
818
def __unicode__(self):
819
return unicode(str(self))
820
821
822
class DBusPropertyAccessException(DBusPropertyException):
823
"""A property's access permissions disallows an operation.
824
"""
825
pass
826
827
828
class DBusPropertyNotFound(DBusPropertyException):
829
"""An attempt was made to access a non-existing property.
830
"""
831
pass
832
833
834
class DBusObjectWithProperties(dbus.service.Object):
835
"""A D-Bus object with properties.
836
837
Classes inheriting from this can use the dbus_service_property
838
decorator to expose methods as D-Bus properties. It exposes the
839
standard Get(), Set(), and GetAll() methods on the D-Bus.
840
"""
841
842
@staticmethod
843
def _is_dbus_thing(thing):
844
"""Returns a function testing if an attribute is a D-Bus thing
845
846
If called like _is_dbus_thing("method") it returns a function
847
suitable for use as predicate to inspect.getmembers().
848
"""
849
return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),
850
False)
851
852
def _get_all_dbus_things(self, thing):
853
"""Returns a generator of (name, attribute) pairs
854
"""
855
return ((getattr(athing.__get__(self), "_dbus_name",
856
name),
857
athing.__get__(self))
858
for cls in self.__class__.__mro__
859
for name, athing in
860
inspect.getmembers(cls,
861
self._is_dbus_thing(thing)))
862
863
def _get_dbus_property(self, interface_name, property_name):
864
"""Returns a bound method if one exists which is a D-Bus
865
property with the specified name and interface.
866
"""
867
for cls in self.__class__.__mro__:
868
for name, value in (inspect.getmembers
869
(cls,
870
self._is_dbus_thing("property"))):
871
if (value._dbus_name == property_name
872
and value._dbus_interface == interface_name):
873
return value.__get__(self)
874
875
# No such property
876
raise DBusPropertyNotFound(self.dbus_object_path + ":"
877
+ interface_name + "."
878
+ property_name)
879
880
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
881
out_signature="v")
882
def Get(self, interface_name, property_name):
883
"""Standard D-Bus property Get() method, see D-Bus standard.
884
"""
885
prop = self._get_dbus_property(interface_name, property_name)
886
if prop._dbus_access == "write":
887
raise DBusPropertyAccessException(property_name)
888
value = prop()
889
if not hasattr(value, "variant_level"):
890
return value
891
return type(value)(value, variant_level=value.variant_level+1)
892
893
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
894
def Set(self, interface_name, property_name, value):
895
"""Standard D-Bus property Set() method, see D-Bus standard.
896
"""
897
prop = self._get_dbus_property(interface_name, property_name)
898
if prop._dbus_access == "read":
899
raise DBusPropertyAccessException(property_name)
900
if prop._dbus_get_args_options["byte_arrays"]:
901
# The byte_arrays option is not supported yet on
902
# signatures other than "ay".
903
if prop._dbus_signature != "ay":
904
raise ValueError
905
value = dbus.ByteArray(b''.join(chr(byte)
906
for byte in value))
907
prop(value)
908
909
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
910
out_signature="a{sv}")
911
def GetAll(self, interface_name):
912
"""Standard D-Bus property GetAll() method, see D-Bus
913
standard.
914
915
Note: Will not include properties with access="write".
916
"""
917
properties = {}
918
for name, prop in self._get_all_dbus_things("property"):
919
if (interface_name
920
and interface_name != prop._dbus_interface):
921
# Interface non-empty but did not match
922
continue
923
# Ignore write-only properties
924
if prop._dbus_access == "write":
925
continue
926
value = prop()
927
if not hasattr(value, "variant_level"):
928
properties[name] = value
929
continue
930
properties[name] = type(value)(value, variant_level=
931
value.variant_level+1)
932
return dbus.Dictionary(properties, signature="sv")
933
934
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
935
out_signature="s",
936
path_keyword='object_path',
937
connection_keyword='connection')
938
def Introspect(self, object_path, connection):
939
"""Overloading of standard D-Bus method.
940
941
Inserts property tags and interface annotation tags.
942
"""
943
xmlstring = dbus.service.Object.Introspect(self, object_path,
944
connection)
945
try:
946
document = xml.dom.minidom.parseString(xmlstring)
947
def make_tag(document, name, prop):
948
e = document.createElement("property")
949
e.setAttribute("name", name)
950
e.setAttribute("type", prop._dbus_signature)
951
e.setAttribute("access", prop._dbus_access)
952
return e
953
for if_tag in document.getElementsByTagName("interface"):
954
# Add property tags
955
for tag in (make_tag(document, name, prop)
956
for name, prop
957
in self._get_all_dbus_things("property")
958
if prop._dbus_interface
959
== if_tag.getAttribute("name")):
960
if_tag.appendChild(tag)
961
# Add annotation tags
962
for typ in ("method", "signal", "property"):
963
for tag in if_tag.getElementsByTagName(typ):
964
annots = dict()
965
for name, prop in (self.
966
_get_all_dbus_things(typ)):
967
if (name == tag.getAttribute("name")
968
and prop._dbus_interface
969
== if_tag.getAttribute("name")):
970
annots.update(getattr
971
(prop,
972
"_dbus_annotations",
973
{}))
974
for name, value in annots.iteritems():
975
ann_tag = document.createElement(
976
"annotation")
977
ann_tag.setAttribute("name", name)
978
ann_tag.setAttribute("value", value)
979
tag.appendChild(ann_tag)
980
# Add interface annotation tags
981
for annotation, value in dict(
982
itertools.chain(
983
*(annotations().iteritems()
984
for name, annotations in
985
self._get_all_dbus_things("interface")
986
if name == if_tag.getAttribute("name")
987
))).iteritems():
988
ann_tag = document.createElement("annotation")
989
ann_tag.setAttribute("name", annotation)
990
ann_tag.setAttribute("value", value)
991
if_tag.appendChild(ann_tag)
992
# Add the names to the return values for the
993
# "org.freedesktop.DBus.Properties" methods
994
if (if_tag.getAttribute("name")
995
== "org.freedesktop.DBus.Properties"):
996
for cn in if_tag.getElementsByTagName("method"):
997
if cn.getAttribute("name") == "Get":
998
for arg in cn.getElementsByTagName("arg"):
999
if (arg.getAttribute("direction")
1000
== "out"):
1001
arg.setAttribute("name", "value")
1002
elif cn.getAttribute("name") == "GetAll":
1003
for arg in cn.getElementsByTagName("arg"):
1004
if (arg.getAttribute("direction")
1005
== "out"):
1006
arg.setAttribute("name", "props")
1007
xmlstring = document.toxml("utf-8")
1008
document.unlink()
1009
except (AttributeError, xml.dom.DOMException,
1010
xml.parsers.expat.ExpatError) as error:
1011
logger.error("Failed to override Introspection method",
1012
exc_info=error)
1013
return xmlstring
1014
1015
1016
def datetime_to_dbus (dt, variant_level=0):
1017
"""Convert a UTC datetime.datetime() to a D-Bus type."""
1018
if dt is None:
1019
return dbus.String("", variant_level = variant_level)
1020
return dbus.String(dt.isoformat(),
1021
variant_level=variant_level)
1022
1023
1024
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1025
"""A class decorator; applied to a subclass of
1026
dbus.service.Object, it will add alternate D-Bus attributes with
1027
interface names according to the "alt_interface_names" mapping.
1028
Usage:
1029
1030
@alternate_dbus_names({"org.example.Interface":
1031
"net.example.AlternateInterface"})
1032
class SampleDBusObject(dbus.service.Object):
1033
@dbus.service.method("org.example.Interface")
1034
def SampleDBusMethod():
1035
pass
1036
1037
The above "SampleDBusMethod" on "SampleDBusObject" will be
1038
reachable via two interfaces: "org.example.Interface" and
1039
"net.example.AlternateInterface", the latter of which will have
1040
its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1041
"true", unless "deprecate" is passed with a False value.
1042
1043
This works for methods and signals, and also for D-Bus properties
1044
(from DBusObjectWithProperties) and interfaces (from the
1045
dbus_interface_annotations decorator).
1046
"""
1047
def wrapper(cls):
1048
for orig_interface_name, alt_interface_name in (
1049
alt_interface_names.iteritems()):
1050
attr = {}
1051
interface_names = set()
1052
# Go though all attributes of the class
1053
for attrname, attribute in inspect.getmembers(cls):
1054
# Ignore non-D-Bus attributes, and D-Bus attributes
1055
# with the wrong interface name
1056
if (not hasattr(attribute, "_dbus_interface")
1057
or not attribute._dbus_interface
1058
.startswith(orig_interface_name)):
1059
continue
1060
# Create an alternate D-Bus interface name based on
1061
# the current name
1062
alt_interface = (attribute._dbus_interface
1063
.replace(orig_interface_name,
1064
alt_interface_name))
1065
interface_names.add(alt_interface)
1066
# Is this a D-Bus signal?
1067
if getattr(attribute, "_dbus_is_signal", False):
1068
# Extract the original non-method function by
1069
# black magic
1070
nonmethod_func = (dict(
1071
zip(attribute.func_code.co_freevars,
1072
attribute.__closure__))["func"]
1073
.cell_contents)
1074
# Create a new, but exactly alike, function
1075
# object, and decorate it to be a new D-Bus signal
1076
# with the alternate D-Bus interface name
1077
new_function = (dbus.service.signal
1078
(alt_interface,
1079
attribute._dbus_signature)
1080
(types.FunctionType(
1081
nonmethod_func.func_code,
1082
nonmethod_func.func_globals,
1083
nonmethod_func.func_name,
1084
nonmethod_func.func_defaults,
1085
nonmethod_func.func_closure)))
1086
# Copy annotations, if any
1087
try:
1088
new_function._dbus_annotations = (
1089
dict(attribute._dbus_annotations))
1090
except AttributeError:
1091
pass
1092
# Define a creator of a function to call both the
1093
# original and alternate functions, so both the
1094
# original and alternate signals gets sent when
1095
# the function is called
1096
def fixscope(func1, func2):
1097
"""This function is a scope container to pass
1098
func1 and func2 to the "call_both" function
1099
outside of its arguments"""
1100
def call_both(*args, **kwargs):
1101
"""This function will emit two D-Bus
1102
signals by calling func1 and func2"""
1103
func1(*args, **kwargs)
1104
func2(*args, **kwargs)
1105
return call_both
1106
# Create the "call_both" function and add it to
1107
# the class
1108
attr[attrname] = fixscope(attribute, new_function)
1109
# Is this a D-Bus method?
1110
elif getattr(attribute, "_dbus_is_method", False):
1111
# Create a new, but exactly alike, function
1112
# object. Decorate it to be a new D-Bus method
1113
# with the alternate D-Bus interface name. Add it
1114
# to the class.
1115
attr[attrname] = (dbus.service.method
1116
(alt_interface,
1117
attribute._dbus_in_signature,
1118
attribute._dbus_out_signature)
1119
(types.FunctionType
1120
(attribute.func_code,
1121
attribute.func_globals,
1122
attribute.func_name,
1123
attribute.func_defaults,
1124
attribute.func_closure)))
1125
# Copy annotations, if any
1126
try:
1127
attr[attrname]._dbus_annotations = (
1128
dict(attribute._dbus_annotations))
1129
except AttributeError:
1130
pass
1131
# Is this a D-Bus property?
1132
elif getattr(attribute, "_dbus_is_property", False):
1133
# Create a new, but exactly alike, function
1134
# object, and decorate it to be a new D-Bus
1135
# property with the alternate D-Bus interface
1136
# name. Add it to the class.
1137
attr[attrname] = (dbus_service_property
1138
(alt_interface,
1139
attribute._dbus_signature,
1140
attribute._dbus_access,
1141
attribute
1142
._dbus_get_args_options
1143
["byte_arrays"])
1144
(types.FunctionType
1145
(attribute.func_code,
1146
attribute.func_globals,
1147
attribute.func_name,
1148
attribute.func_defaults,
1149
attribute.func_closure)))
1150
# Copy annotations, if any
1151
try:
1152
attr[attrname]._dbus_annotations = (
1153
dict(attribute._dbus_annotations))
1154
except AttributeError:
1155
pass
1156
# Is this a D-Bus interface?
1157
elif getattr(attribute, "_dbus_is_interface", False):
1158
# Create a new, but exactly alike, function
1159
# object. Decorate it to be a new D-Bus interface
1160
# with the alternate D-Bus interface name. Add it
1161
# to the class.
1162
attr[attrname] = (dbus_interface_annotations
1163
(alt_interface)
1164
(types.FunctionType
1165
(attribute.func_code,
1166
attribute.func_globals,
1167
attribute.func_name,
1168
attribute.func_defaults,
1169
attribute.func_closure)))
1170
if deprecate:
1171
# Deprecate all alternate interfaces
1172
iname="_AlternateDBusNames_interface_annotation{0}"
1173
for interface_name in interface_names:
1174
@dbus_interface_annotations(interface_name)
1175
def func(self):
1176
return { "org.freedesktop.DBus.Deprecated":
1177
"true" }
1178
# Find an unused name
1179
for aname in (iname.format(i)
1180
for i in itertools.count()):
1181
if aname not in attr:
1182
attr[aname] = func
1183
break
1184
if interface_names:
1185
# Replace the class with a new subclass of it with
1186
# methods, signals, etc. as created above.
1187
cls = type(b"{0}Alternate".format(cls.__name__),
1188
(cls,), attr)
1189
return cls
1190
return wrapper
1191
1192
1193
@alternate_dbus_interfaces({"se.recompile.Mandos":
1194
"se.bsnet.fukt.Mandos"})
1195
class ClientDBus(Client, DBusObjectWithProperties):
1196
"""A Client class using D-Bus
1197
1198
Attributes:
1199
dbus_object_path: dbus.ObjectPath
1200
bus: dbus.SystemBus()
1201
"""
1202
1203
runtime_expansions = (Client.runtime_expansions
1204
+ ("dbus_object_path",))
1205
1206
# dbus.service.Object doesn't use super(), so we can't either.
1207
1208
def __init__(self, bus = None, *args, **kwargs):
1209
self.bus = bus
1210
Client.__init__(self, *args, **kwargs)
1211
# Only now, when this client is initialized, can it show up on
1212
# the D-Bus
1213
client_object_name = unicode(self.name).translate(
1214
{ord("."): ord("_"),
1215
ord("-"): ord("_")})
1216
self.dbus_object_path = (dbus.ObjectPath
1217
("/clients/" + client_object_name))
1218
DBusObjectWithProperties.__init__(self, self.bus,
1219
self.dbus_object_path)
1220
1221
def notifychangeproperty(transform_func,
1222
dbus_name, type_func=lambda x: x,
1223
variant_level=1):
1224
""" Modify a variable so that it's a property which announces
1225
its changes to DBus.
1226
1227
transform_fun: Function that takes a value and a variant_level
1228
and transforms it to a D-Bus type.
1229
dbus_name: D-Bus name of the variable
1230
type_func: Function that transform the value before sending it
1231
to the D-Bus. Default: no transform
1232
variant_level: D-Bus variant level. Default: 1
1233
"""
1234
attrname = "_{0}".format(dbus_name)
1235
def setter(self, value):
1236
if hasattr(self, "dbus_object_path"):
1237
if (not hasattr(self, attrname) or
1238
type_func(getattr(self, attrname, None))
1239
!= type_func(value)):
1240
dbus_value = transform_func(type_func(value),
1241
variant_level
1242
=variant_level)
1243
self.PropertyChanged(dbus.String(dbus_name),
1244
dbus_value)
1245
setattr(self, attrname, value)
1246
1247
return property(lambda self: getattr(self, attrname), setter)
1248
1249
expires = notifychangeproperty(datetime_to_dbus, "Expires")
1250
approvals_pending = notifychangeproperty(dbus.Boolean,
1251
"ApprovalPending",
1252
type_func = bool)
1253
enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1254
last_enabled = notifychangeproperty(datetime_to_dbus,
1255
"LastEnabled")
1256
checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1257
type_func = lambda checker:
1258
checker is not None)
1259
last_checked_ok = notifychangeproperty(datetime_to_dbus,
1260
"LastCheckedOK")
1261
last_checker_status = notifychangeproperty(dbus.Int16,
1262
"LastCheckerStatus")
1263
last_approval_request = notifychangeproperty(
1264
datetime_to_dbus, "LastApprovalRequest")
1265
approved_by_default = notifychangeproperty(dbus.Boolean,
1266
"ApprovedByDefault")
1267
approval_delay = notifychangeproperty(dbus.UInt64,
1268
"ApprovalDelay",
1269
type_func =
1270
timedelta_to_milliseconds)
1271
approval_duration = notifychangeproperty(
1272
dbus.UInt64, "ApprovalDuration",
1273
type_func = timedelta_to_milliseconds)
1274
host = notifychangeproperty(dbus.String, "Host")
1275
timeout = notifychangeproperty(dbus.UInt64, "Timeout",
1276
type_func =
1277
timedelta_to_milliseconds)
1278
extended_timeout = notifychangeproperty(
1279
dbus.UInt64, "ExtendedTimeout",
1280
type_func = timedelta_to_milliseconds)
1281
interval = notifychangeproperty(dbus.UInt64,
1282
"Interval",
1283
type_func =
1284
timedelta_to_milliseconds)
1285
checker_command = notifychangeproperty(dbus.String, "Checker")
1286
1287
del notifychangeproperty
1288
1289
def __del__(self, *args, **kwargs):
1290
try:
1291
self.remove_from_connection()
1292
except LookupError:
1293
pass
1294
if hasattr(DBusObjectWithProperties, "__del__"):
1295
DBusObjectWithProperties.__del__(self, *args, **kwargs)
1296
Client.__del__(self, *args, **kwargs)
1297
1298
def checker_callback(self, pid, condition, command,
1299
*args, **kwargs):
1300
self.checker_callback_tag = None
1301
self.checker = None
1302
if os.WIFEXITED(condition):
1303
exitstatus = os.WEXITSTATUS(condition)
1304
# Emit D-Bus signal
1305
self.CheckerCompleted(dbus.Int16(exitstatus),
1306
dbus.Int64(condition),
1307
dbus.String(command))
1308
else:
1309
# Emit D-Bus signal
1310
self.CheckerCompleted(dbus.Int16(-1),
1311
dbus.Int64(condition),
1312
dbus.String(command))
1313
1314
return Client.checker_callback(self, pid, condition, command,
1315
*args, **kwargs)
1316
1317
def start_checker(self, *args, **kwargs):
1318
old_checker = self.checker
1319
if self.checker is not None:
1320
old_checker_pid = self.checker.pid
1321
else:
1322
old_checker_pid = None
1323
r = Client.start_checker(self, *args, **kwargs)
1324
# Only if new checker process was started
1325
if (self.checker is not None
1326
and old_checker_pid != self.checker.pid):
1327
# Emit D-Bus signal
1328
self.CheckerStarted(self.current_checker_command)
1329
return r
1330
1331
def _reset_approved(self):
1332
self.approved = None
1333
return False
1334
1335
def approve(self, value=True):
1336
self.send_changedstate()
1337
self.approved = value
1338
gobject.timeout_add(timedelta_to_milliseconds
1339
(self.approval_duration),
1340
self._reset_approved)
1341
1342
## D-Bus methods, signals & properties
1343
_interface = "se.recompile.Mandos.Client"
1344
1345
## Interfaces
1346
1347
@dbus_interface_annotations(_interface)
1348
def _foo(self):
1349
return { "org.freedesktop.DBus.Property.EmitsChangedSignal":
1350
"false"}
1351
1352
## Signals
1353
1354
# CheckerCompleted - signal
1355
@dbus.service.signal(_interface, signature="nxs")
1356
def CheckerCompleted(self, exitcode, waitstatus, command):
1357
"D-Bus signal"
1358
pass
1359
1360
# CheckerStarted - signal
1361
@dbus.service.signal(_interface, signature="s")
1362
def CheckerStarted(self, command):
1363
"D-Bus signal"
1364
pass
1365
1366
# PropertyChanged - signal
1367
@dbus.service.signal(_interface, signature="sv")
1368
def PropertyChanged(self, property, value):
1369
"D-Bus signal"
1370
pass
1371
1372
# GotSecret - signal
1373
@dbus.service.signal(_interface)
1374
def GotSecret(self):
1375
"""D-Bus signal
1376
Is sent after a successful transfer of secret from the Mandos
1377
server to mandos-client
1378
"""
1379
pass
1380
1381
# Rejected - signal
1382
@dbus.service.signal(_interface, signature="s")
1383
def Rejected(self, reason):
1384
"D-Bus signal"
1385
pass
1386
1387
# NeedApproval - signal
1388
@dbus.service.signal(_interface, signature="tb")
1389
def NeedApproval(self, timeout, default):
1390
"D-Bus signal"
1391
return self.need_approval()
1392
1393
## Methods
1394
1395
# Approve - method
1396
@dbus.service.method(_interface, in_signature="b")
1397
def Approve(self, value):
1398
self.approve(value)
1399
1400
# CheckedOK - method
1401
@dbus.service.method(_interface)
1402
def CheckedOK(self):
1403
self.checked_ok()
1404
1405
# Enable - method
1406
@dbus.service.method(_interface)
1407
def Enable(self):
1408
"D-Bus method"
1409
self.enable()
1410
1411
# StartChecker - method
1412
@dbus.service.method(_interface)
1413
def StartChecker(self):
1414
"D-Bus method"
1415
self.start_checker()
1416
1417
# Disable - method
1418
@dbus.service.method(_interface)
1419
def Disable(self):
1420
"D-Bus method"
1421
self.disable()
1422
1423
# StopChecker - method
1424
@dbus.service.method(_interface)
1425
def StopChecker(self):
1426
self.stop_checker()
1427
1428
## Properties
1429
1430
# ApprovalPending - property
1431
@dbus_service_property(_interface, signature="b", access="read")
1432
def ApprovalPending_dbus_property(self):
1433
return dbus.Boolean(bool(self.approvals_pending))
1434
1435
# ApprovedByDefault - property
1436
@dbus_service_property(_interface, signature="b",
1437
access="readwrite")
1438
def ApprovedByDefault_dbus_property(self, value=None):
1439
if value is None: # get
1440
return dbus.Boolean(self.approved_by_default)
1441
self.approved_by_default = bool(value)
1442
1443
# ApprovalDelay - property
1444
@dbus_service_property(_interface, signature="t",
1445
access="readwrite")
1446
def ApprovalDelay_dbus_property(self, value=None):
1447
if value is None: # get
1448
return dbus.UInt64(self.approval_delay_milliseconds())
1449
self.approval_delay = datetime.timedelta(0, 0, 0, value)
1450
1451
# ApprovalDuration - property
1452
@dbus_service_property(_interface, signature="t",
1453
access="readwrite")
1454
def ApprovalDuration_dbus_property(self, value=None):
1455
if value is None: # get
1456
return dbus.UInt64(timedelta_to_milliseconds(
1457
self.approval_duration))
1458
self.approval_duration = datetime.timedelta(0, 0, 0, value)
1459
1460
# Name - property
1461
@dbus_service_property(_interface, signature="s", access="read")
1462
def Name_dbus_property(self):
1463
return dbus.String(self.name)
1464
1465
# Fingerprint - property
1466
@dbus_service_property(_interface, signature="s", access="read")
1467
def Fingerprint_dbus_property(self):
1468
return dbus.String(self.fingerprint)
1469
1470
# Host - property
1471
@dbus_service_property(_interface, signature="s",
1472
access="readwrite")
1473
def Host_dbus_property(self, value=None):
1474
if value is None: # get
1475
return dbus.String(self.host)
1476
self.host = unicode(value)
1477
1478
# Created - property
1479
@dbus_service_property(_interface, signature="s", access="read")
1480
def Created_dbus_property(self):
1481
return datetime_to_dbus(self.created)
1482
1483
# LastEnabled - property
1484
@dbus_service_property(_interface, signature="s", access="read")
1485
def LastEnabled_dbus_property(self):
1486
return datetime_to_dbus(self.last_enabled)
1487
1488
# Enabled - property
1489
@dbus_service_property(_interface, signature="b",
1490
access="readwrite")
1491
def Enabled_dbus_property(self, value=None):
1492
if value is None: # get
1493
return dbus.Boolean(self.enabled)
1494
if value:
1495
self.enable()
1496
else:
1497
self.disable()
1498
1499
# LastCheckedOK - property
1500
@dbus_service_property(_interface, signature="s",
1501
access="readwrite")
1502
def LastCheckedOK_dbus_property(self, value=None):
1503
if value is not None:
1504
self.checked_ok()
1505
return
1506
return datetime_to_dbus(self.last_checked_ok)
1507
1508
# LastCheckerStatus - property
1509
@dbus_service_property(_interface, signature="n",
1510
access="read")
1511
def LastCheckerStatus_dbus_property(self):
1512
return dbus.Int16(self.last_checker_status)
1513
1514
# Expires - property
1515
@dbus_service_property(_interface, signature="s", access="read")
1516
def Expires_dbus_property(self):
1517
return datetime_to_dbus(self.expires)
1518
1519
# LastApprovalRequest - property
1520
@dbus_service_property(_interface, signature="s", access="read")
1521
def LastApprovalRequest_dbus_property(self):
1522
return datetime_to_dbus(self.last_approval_request)
1523
1524
# Timeout - property
1525
@dbus_service_property(_interface, signature="t",
1526
access="readwrite")
1527
def Timeout_dbus_property(self, value=None):
1528
if value is None: # get
1529
return dbus.UInt64(self.timeout_milliseconds())
1530
self.timeout = datetime.timedelta(0, 0, 0, value)
1531
# Reschedule timeout
1532
if self.enabled:
1533
now = datetime.datetime.utcnow()
1534
time_to_die = timedelta_to_milliseconds(
1535
(self.last_checked_ok + self.timeout) - now)
1536
if time_to_die <= 0:
1537
# The timeout has passed
1538
self.disable()
1539
else:
1540
self.expires = (now +
1541
datetime.timedelta(milliseconds =
1542
time_to_die))
1543
if (getattr(self, "disable_initiator_tag", None)
1544
is None):
1545
return
1546
gobject.source_remove(self.disable_initiator_tag)
1547
self.disable_initiator_tag = (gobject.timeout_add
1548
(time_to_die,
1549
self.disable))
1550
1551
# ExtendedTimeout - property
1552
@dbus_service_property(_interface, signature="t",
1553
access="readwrite")
1554
def ExtendedTimeout_dbus_property(self, value=None):
1555
if value is None: # get
1556
return dbus.UInt64(self.extended_timeout_milliseconds())
1557
self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1558
1559
# Interval - property
1560
@dbus_service_property(_interface, signature="t",
1561
access="readwrite")
1562
def Interval_dbus_property(self, value=None):
1563
if value is None: # get
1564
return dbus.UInt64(self.interval_milliseconds())
1565
self.interval = datetime.timedelta(0, 0, 0, value)
1566
if getattr(self, "checker_initiator_tag", None) is None:
1567
return
1568
if self.enabled:
1569
# Reschedule checker run
1570
gobject.source_remove(self.checker_initiator_tag)
1571
self.checker_initiator_tag = (gobject.timeout_add
1572
(value, self.start_checker))
1573
self.start_checker() # Start one now, too
1574
1575
# Checker - property
1576
@dbus_service_property(_interface, signature="s",
1577
access="readwrite")
1578
def Checker_dbus_property(self, value=None):
1579
if value is None: # get
1580
return dbus.String(self.checker_command)
1581
self.checker_command = unicode(value)
1582
1583
# CheckerRunning - property
1584
@dbus_service_property(_interface, signature="b",
1585
access="readwrite")
1586
def CheckerRunning_dbus_property(self, value=None):
1587
if value is None: # get
1588
return dbus.Boolean(self.checker is not None)
1589
if value:
1590
self.start_checker()
1591
else:
1592
self.stop_checker()
1593
1594
# ObjectPath - property
1595
@dbus_service_property(_interface, signature="o", access="read")
1596
def ObjectPath_dbus_property(self):
1597
return self.dbus_object_path # is already a dbus.ObjectPath
1598
1599
# Secret = property
1600
@dbus_service_property(_interface, signature="ay",
1601
access="write", byte_arrays=True)
1602
def Secret_dbus_property(self, value):
1603
self.secret = str(value)
1604
1605
del _interface
1606
1607
1608
class ProxyClient(object):
1609
def __init__(self, child_pipe, fpr, address):
1610
self._pipe = child_pipe
1611
self._pipe.send(('init', fpr, address))
1612
if not self._pipe.recv():
1613
raise KeyError()
1614
1615
def __getattribute__(self, name):
1616
if name == '_pipe':
1617
return super(ProxyClient, self).__getattribute__(name)
1618
self._pipe.send(('getattr', name))
1619
data = self._pipe.recv()
1620
if data[0] == 'data':
1621
return data[1]
1622
if data[0] == 'function':
1623
def func(*args, **kwargs):
1624
self._pipe.send(('funcall', name, args, kwargs))
1625
return self._pipe.recv()[1]
1626
return func
1627
1628
def __setattr__(self, name, value):
1629
if name == '_pipe':
1630
return super(ProxyClient, self).__setattr__(name, value)
1631
self._pipe.send(('setattr', name, value))
1632
1633
1634
class ClientHandler(socketserver.BaseRequestHandler, object):
1635
"""A class to handle client connections.
1636
1637
Instantiated once for each connection to handle it.
426
1638
Note: This will run in its own forked process."""
427
1639
428
1640
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.
1641
with contextlib.closing(self.server.child_pipe) as child_pipe:
1642
logger.info("TCP connection from: %s",
1643
unicode(self.client_address))
1644
logger.debug("Pipe FD: %d",
1645
self.server.child_pipe.fileno())
1646
1647
session = (gnutls.connection
1648
.ClientSession(self.request,
1649
gnutls.connection
1650
.X509Credentials()))
1651
1652
# Note: gnutls.connection.X509Credentials is really a
1653
# generic GnuTLS certificate credentials object so long as
1654
# no X.509 keys are added to it. Therefore, we can use it
1655
# here despite using OpenPGP certificates.
1656
1657
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
1658
# "+AES-256-CBC", "+SHA1",
1659
# "+COMP-NULL", "+CTYPE-OPENPGP",
1660
# "+DHE-DSS"))
1661
# Use a fallback default, since this MUST be set.
1662
priority = self.server.gnutls_priority
1663
if priority is None:
1664
priority = "NORMAL"
1665
(gnutls.library.functions
1666
.gnutls_priority_set_direct(session._c_object,
1667
priority, None))
1668
1669
# Start communication using the Mandos protocol
1670
# Get protocol number
1671
line = self.request.makefile().readline()
1672
logger.debug("Protocol version: %r", line)
1673
try:
1674
if int(line.strip().split()[0]) > 1:
1675
raise RuntimeError
1676
except (ValueError, IndexError, RuntimeError) as error:
1677
logger.error("Unknown protocol version: %s", error)
1678
return
1679
1680
# Start GnuTLS connection
1681
try:
1682
session.handshake()
1683
except gnutls.errors.GNUTLSError as error:
1684
logger.warning("Handshake failed: %s", error)
1685
# Do not run session.bye() here: the session is not
1686
# established. Just abandon the request.
1687
return
1688
logger.debug("Handshake succeeded")
1689
1690
approval_required = False
1691
try:
1692
try:
1693
fpr = self.fingerprint(self.peer_certificate
1694
(session))
1695
except (TypeError,
1696
gnutls.errors.GNUTLSError) as error:
1697
logger.warning("Bad certificate: %s", error)
1698
return
1699
logger.debug("Fingerprint: %s", fpr)
1700
1701
try:
1702
client = ProxyClient(child_pipe, fpr,
1703
self.client_address)
1704
except KeyError:
1705
return
1706
1707
if client.approval_delay:
1708
delay = client.approval_delay
1709
client.approvals_pending += 1
1710
approval_required = True
1711
1712
while True:
1713
if not client.enabled:
1714
logger.info("Client %s is disabled",
1715
client.name)
1716
if self.server.use_dbus:
1717
# Emit D-Bus signal
1718
client.Rejected("Disabled")
1719
return
1720
1721
if client.approved or not client.approval_delay:
1722
#We are approved or approval is disabled
1723
break
1724
elif client.approved is None:
1725
logger.info("Client %s needs approval",
1726
client.name)
1727
if self.server.use_dbus:
1728
# Emit D-Bus signal
1729
client.NeedApproval(
1730
client.approval_delay_milliseconds(),
1731
client.approved_by_default)
1732
else:
1733
logger.warning("Client %s was not approved",
1734
client.name)
1735
if self.server.use_dbus:
1736
# Emit D-Bus signal
1737
client.Rejected("Denied")
1738
return
1739
1740
#wait until timeout or approved
1741
time = datetime.datetime.now()
1742
client.changedstate.acquire()
1743
(client.changedstate.wait
1744
(float(client.timedelta_to_milliseconds(delay)
1745
/ 1000)))
1746
client.changedstate.release()
1747
time2 = datetime.datetime.now()
1748
if (time2 - time) >= delay:
1749
if not client.approved_by_default:
1750
logger.warning("Client %s timed out while"
1751
" waiting for approval",
1752
client.name)
1753
if self.server.use_dbus:
1754
# Emit D-Bus signal
1755
client.Rejected("Approval timed out")
1756
return
1757
else:
1758
break
1759
else:
1760
delay -= time2 - time
1761
1762
sent_size = 0
1763
while sent_size < len(client.secret):
1764
try:
1765
sent = session.send(client.secret[sent_size:])
1766
except gnutls.errors.GNUTLSError as error:
1767
logger.warning("gnutls send failed",
1768
exc_info=error)
1769
return
1770
logger.debug("Sent: %d, remaining: %d",
1771
sent, len(client.secret)
1772
- (sent_size + sent))
1773
sent_size += sent
1774
1775
logger.info("Sending secret to %s", client.name)
1776
# bump the timeout using extended_timeout
1777
client.bump_timeout(client.extended_timeout)
1778
if self.server.use_dbus:
1779
# Emit D-Bus signal
1780
client.GotSecret()
1781
1782
finally:
1783
if approval_required:
1784
client.approvals_pending -= 1
1785
try:
1786
session.bye()
1787
except gnutls.errors.GNUTLSError as error:
1788
logger.warning("GnuTLS bye failed",
1789
exc_info=error)
1790
1791
@staticmethod
1792
def peer_certificate(session):
1793
"Return the peer's OpenPGP certificate as a bytestring"
1794
# If not an OpenPGP certificate...
1795
if (gnutls.library.functions
1796
.gnutls_certificate_type_get(session._c_object)
1797
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1798
# ...do the normal thing
1799
return session.peer_certificate
1800
list_size = ctypes.c_uint(1)
1801
cert_list = (gnutls.library.functions
1802
.gnutls_certificate_get_peers
1803
(session._c_object, ctypes.byref(list_size)))
1804
if not bool(cert_list) and list_size.value != 0:
1805
raise gnutls.errors.GNUTLSError("error getting peer"
1806
" certificate")
1807
if list_size.value == 0:
1808
return None
1809
cert = cert_list[0]
1810
return ctypes.string_at(cert.data, cert.size)
1811
1812
@staticmethod
1813
def fingerprint(openpgp):
1814
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1815
# New GnuTLS "datum" with the OpenPGP public key
1816
datum = (gnutls.library.types
1817
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1818
ctypes.POINTER
1819
(ctypes.c_ubyte)),
1820
ctypes.c_uint(len(openpgp))))
1821
# New empty GnuTLS certificate
1822
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1823
(gnutls.library.functions
1824
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1825
# Import the OpenPGP public key into the certificate
1826
(gnutls.library.functions
1827
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1828
gnutls.library.constants
1829
.GNUTLS_OPENPGP_FMT_RAW))
1830
# Verify the self signature in the key
1831
crtverify = ctypes.c_uint()
1832
(gnutls.library.functions
1833
.gnutls_openpgp_crt_verify_self(crt, 0,
1834
ctypes.byref(crtverify)))
1835
if crtverify.value != 0:
1836
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1837
raise (gnutls.errors.CertificateSecurityError
1838
("Verify failed"))
1839
# New buffer for the fingerprint
1840
buf = ctypes.create_string_buffer(20)
1841
buf_len = ctypes.c_size_t()
1842
# Get the fingerprint from the certificate into the buffer
1843
(gnutls.library.functions
1844
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1845
ctypes.byref(buf_len)))
1846
# Deinit the certificate
1847
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1848
# Convert the buffer to a Python bytestring
1849
fpr = ctypes.string_at(buf, buf_len.value)
1850
# Convert the bytestring to hexadecimal notation
1851
hex_fpr = binascii.hexlify(fpr).upper()
1852
return hex_fpr
1853
1854
1855
class MultiprocessingMixIn(object):
1856
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1857
def sub_process_main(self, request, address):
1858
try:
1859
self.finish_request(request, address)
1860
except Exception:
1861
self.handle_error(request, address)
1862
self.close_request(request)
1863
1864
def process_request(self, request, address):
1865
"""Start a new process to process the request."""
1866
proc = multiprocessing.Process(target = self.sub_process_main,
1867
args = (request,
1868
address))
1869
proc.start()
1870
return proc
1871
1872
1873
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1874
""" adds a pipe to the MixIn """
1875
def process_request(self, request, client_address):
1876
"""Overrides and wraps the original process_request().
1877
1878
This function creates a new pipe in self.pipe
1879
"""
1880
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1881
1882
proc = MultiprocessingMixIn.process_request(self, request,
1883
client_address)
1884
self.child_pipe.close()
1885
self.add_pipe(parent_pipe, proc)
1886
1887
def add_pipe(self, parent_pipe, proc):
1888
"""Dummy function; override as necessary"""
1889
raise NotImplementedError
1890
1891
1892
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1893
socketserver.TCPServer, object):
1894
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1895
502
1896
Attributes:
503
settings: Server settings
504
clients: Set() of Client objects
1897
enabled: Boolean; whether this server is activated yet
1898
interface: None or a network interface name (string)
1899
use_ipv6: Boolean; to use IPv6 or not
505
1900
"""
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)
1901
def __init__(self, server_address, RequestHandlerClass,
1902
interface=None, use_ipv6=True):
1903
self.interface = interface
1904
if use_ipv6:
1905
self.address_family = socket.AF_INET6
1906
socketserver.TCPServer.__init__(self, server_address,
1907
RequestHandlerClass)
515
1908
def server_bind(self):
516
1909
"""This overrides the normal server_bind() function
517
1910
to bind to an interface if one was specified, and also NOT to
518
1911
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
1912
if self.interface is not None:
1913
if SO_BINDTODEVICE is None:
1914
logger.error("SO_BINDTODEVICE does not exist;"
1915
" cannot bind to interface %s",
1916
self.interface)
1917
else:
1918
try:
1919
self.socket.setsockopt(socket.SOL_SOCKET,
1920
SO_BINDTODEVICE,
1921
str(self.interface
1922
+ '\0'))
1923
except socket.error as error:
1924
if error[0] == errno.EPERM:
1925
logger.error("No permission to"
1926
" bind to interface %s",
1927
self.interface)
1928
elif error[0] == errno.ENOPROTOOPT:
1929
logger.error("SO_BINDTODEVICE not available;"
1930
" cannot bind to interface %s",
1931
self.interface)
1932
else:
1933
raise
533
1934
# Only bind(2) the socket if we really need to.
534
1935
if self.server_address[0] or self.server_address[1]:
535
1936
if not self.server_address[0]:
536
in6addr_any = "::"
537
self.server_address = (in6addr_any,
1937
if self.address_family == socket.AF_INET6:
1938
any_address = "::" # in6addr_any
1939
else:
1940
any_address = socket.INADDR_ANY
1941
self.server_address = (any_address,
538
1942
self.server_address[1])
539
1943
elif not self.server_address[1]:
540
1944
self.server_address = (self.server_address[0],
541
1945
0)
542
# if self.settings["interface"]:
1946
# if self.interface:
543
1947
# self.server_address = (self.server_address[0],
544
1948
# 0, # port
545
1949
# 0, # flowinfo
546
1950
# if_nametoindex
547
# (self.settings
548
# ["interface"]))
549
return super(type(self), self).server_bind()
1951
# (self.interface))
1952
return socketserver.TCPServer.server_bind(self)
1953
1954
1955
class MandosServer(IPv6_TCPServer):
1956
"""Mandos server.
1957
1958
Attributes:
1959
clients: set of Client objects
1960
gnutls_priority GnuTLS priority string
1961
use_dbus: Boolean; to emit D-Bus signals or not
1962
1963
Assumes a gobject.MainLoop event loop.
1964
"""
1965
def __init__(self, server_address, RequestHandlerClass,
1966
interface=None, use_ipv6=True, clients=None,
1967
gnutls_priority=None, use_dbus=True):
1968
self.enabled = False
1969
self.clients = clients
1970
if self.clients is None:
1971
self.clients = {}
1972
self.use_dbus = use_dbus
1973
self.gnutls_priority = gnutls_priority
1974
IPv6_TCPServer.__init__(self, server_address,
1975
RequestHandlerClass,
1976
interface = interface,
1977
use_ipv6 = use_ipv6)
1978
def server_activate(self):
1979
if self.enabled:
1980
return socketserver.TCPServer.server_activate(self)
1981
1982
def enable(self):
1983
self.enabled = True
1984
1985
def add_pipe(self, parent_pipe, proc):
1986
# Call "handle_ipc" for both data and EOF events
1987
gobject.io_add_watch(parent_pipe.fileno(),
1988
gobject.IO_IN | gobject.IO_HUP,
1989
functools.partial(self.handle_ipc,
1990
parent_pipe =
1991
parent_pipe,
1992
proc = proc))
1993
1994
def handle_ipc(self, source, condition, parent_pipe=None,
1995
proc = None, client_object=None):
1996
condition_names = {
1997
gobject.IO_IN: "IN", # There is data to read.
1998
gobject.IO_OUT: "OUT", # Data can be written (without
1999
# blocking).
2000
gobject.IO_PRI: "PRI", # There is urgent data to read.
2001
gobject.IO_ERR: "ERR", # Error condition.
2002
gobject.IO_HUP: "HUP" # Hung up (the connection has been
2003
# broken, usually for pipes and
2004
# sockets).
2005
}
2006
conditions_string = ' | '.join(name
2007
for cond, name in
2008
condition_names.iteritems()
2009
if cond & condition)
2010
# error, or the other end of multiprocessing.Pipe has closed
2011
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
2012
# Wait for other process to exit
2013
proc.join()
2014
return False
2015
2016
# Read a request from the child
2017
request = parent_pipe.recv()
2018
command = request[0]
2019
2020
if command == 'init':
2021
fpr = request[1]
2022
address = request[2]
2023
2024
for c in self.clients.itervalues():
2025
if c.fingerprint == fpr:
2026
client = c
2027
break
2028
else:
2029
logger.info("Client not found for fingerprint: %s, ad"
2030
"dress: %s", fpr, address)
2031
if self.use_dbus:
2032
# Emit D-Bus signal
2033
mandos_dbus_service.ClientNotFound(fpr,
2034
address[0])
2035
parent_pipe.send(False)
2036
return False
2037
2038
gobject.io_add_watch(parent_pipe.fileno(),
2039
gobject.IO_IN | gobject.IO_HUP,
2040
functools.partial(self.handle_ipc,
2041
parent_pipe =
2042
parent_pipe,
2043
proc = proc,
2044
client_object =
2045
client))
2046
parent_pipe.send(True)
2047
# remove the old hook in favor of the new above hook on
2048
# same fileno
2049
return False
2050
if command == 'funcall':
2051
funcname = request[1]
2052
args = request[2]
2053
kwargs = request[3]
2054
2055
parent_pipe.send(('data', getattr(client_object,
2056
funcname)(*args,
2057
**kwargs)))
2058
2059
if command == 'getattr':
2060
attrname = request[1]
2061
if callable(client_object.__getattribute__(attrname)):
2062
parent_pipe.send(('function',))
2063
else:
2064
parent_pipe.send(('data', client_object
2065
.__getattribute__(attrname)))
2066
2067
if command == 'setattr':
2068
attrname = request[1]
2069
value = request[2]
2070
setattr(client_object, attrname, value)
2071
2072
return True
550
2073
551
2074
552
2075
def string_to_delta(interval):
553
2076
"""Parse a string and return a datetime.timedelta
554
2077
555
2078
>>> string_to_delta('7d')
556
2079
datetime.timedelta(7)
557
2080
>>> string_to_delta('60s')
560
2083
datetime.timedelta(0, 3600)
561
2084
>>> string_to_delta('24h')
562
2085
datetime.timedelta(1)
563
>>> string_to_delta(u'1w')
2086
>>> string_to_delta('1w')
564
2087
datetime.timedelta(7)
2088
>>> string_to_delta('5m 30s')
2089
datetime.timedelta(0, 330)
565
2090
"""
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))
608
609
def if_nametoindex(interface):
610
"""Call the C function if_nametoindex(), or equivalent"""
611
global if_nametoindex
612
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
617
except (OSError, AttributeError):
618
if "struct" not in sys.modules:
619
import struct
620
if "fcntl" not in sys.modules:
621
import fcntl
622
def if_nametoindex(interface):
623
"Get an interface index the hard way, i.e. using fcntl()"
624
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]
630
return interface_index
631
return if_nametoindex(interface)
2091
timevalue = datetime.timedelta(0)
2092
for s in interval.split():
2093
try:
2094
suffix = unicode(s[-1])
2095
value = int(s[:-1])
2096
if suffix == "d":
2097
delta = datetime.timedelta(value)
2098
elif suffix == "s":
2099
delta = datetime.timedelta(0, value)
2100
elif suffix == "m":
2101
delta = datetime.timedelta(0, 0, 0, 0, value)
2102
elif suffix == "h":
2103
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2104
elif suffix == "w":
2105
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2106
else:
2107
raise ValueError("Unknown suffix {0!r}"
2108
.format(suffix))
2109
except (ValueError, IndexError) as e:
2110
raise ValueError(*(e.args))
2111
timevalue += delta
2112
return timevalue
632
2113
633
2114
634
2115
def daemon(nochdir = False, noclose = False):
635
2116
"""See daemon(3). Standard BSD Unix function.
2117
636
2118
This should really exist as os.daemon, but it doesn't (yet)."""
637
2119
if os.fork():
638
2120
sys.exit()
643
2125
sys.exit()
644
2126
if not noclose:
645
2127
# Close all standard open file descriptors
646
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2128
null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
647
2129
if not stat.S_ISCHR(os.fstat(null).st_mode):
648
2130
raise OSError(errno.ENODEV,
649
"/dev/null not a character device")
2131
"{0} not a character device"
2132
.format(os.devnull))
650
2133
os.dup2(null, sys.stdin.fileno())
651
2134
os.dup2(null, sys.stdout.fileno())
652
2135
os.dup2(null, sys.stderr.fileno())
655
2138
656
2139
657
2140
def main():
658
global main_loop_started
659
main_loop_started = False
660
661
parser = OptionParser(version = "%%prog %s" % version)
662
parser.add_option("-i", "--interface", type="string",
663
metavar="IF", help="Bind to interface IF")
664
parser.add_option("-a", "--address", type="string",
665
help="Address to listen for requests on")
666
parser.add_option("-p", "--port", type="int",
667
help="Port number to receive requests on")
668
parser.add_option("--check", action="store_true", default=False,
669
help="Run self-test")
670
parser.add_option("--debug", action="store_true",
671
help="Debug mode; run in foreground and log to"
672
" terminal")
673
parser.add_option("--priority", type="string", help="GnuTLS"
674
" priority string (see GnuTLS documentation)")
675
parser.add_option("--servicename", type="string", metavar="NAME",
676
help="Zeroconf service name")
677
parser.add_option("--configdir", type="string",
678
default="/etc/mandos", metavar="DIR",
679
help="Directory to search for configuration"
680
" files")
681
(options, args) = parser.parse_args()
2141
2142
##################################################################
2143
# Parsing of options, both command line and config file
2144
2145
parser = argparse.ArgumentParser()
2146
parser.add_argument("-v", "--version", action="version",
2147
version = "%(prog)s {0}".format(version),
2148
help="show version number and exit")
2149
parser.add_argument("-i", "--interface", metavar="IF",
2150
help="Bind to interface IF")
2151
parser.add_argument("-a", "--address",
2152
help="Address to listen for requests on")
2153
parser.add_argument("-p", "--port", type=int,
2154
help="Port number to receive requests on")
2155
parser.add_argument("--check", action="store_true",
2156
help="Run self-test")
2157
parser.add_argument("--debug", action="store_true",
2158
help="Debug mode; run in foreground and log"
2159
" to terminal")
2160
parser.add_argument("--debuglevel", metavar="LEVEL",
2161
help="Debug level for stdout output")
2162
parser.add_argument("--priority", help="GnuTLS"
2163
" priority string (see GnuTLS documentation)")
2164
parser.add_argument("--servicename",
2165
metavar="NAME", help="Zeroconf service name")
2166
parser.add_argument("--configdir",
2167
default="/etc/mandos", metavar="DIR",
2168
help="Directory to search for configuration"
2169
" files")
2170
parser.add_argument("--no-dbus", action="store_false",
2171
dest="use_dbus", help="Do not provide D-Bus"
2172
" system bus interface")
2173
parser.add_argument("--no-ipv6", action="store_false",
2174
dest="use_ipv6", help="Do not use IPv6")
2175
parser.add_argument("--no-restore", action="store_false",
2176
dest="restore", help="Do not restore stored"
2177
" state")
2178
parser.add_argument("--statedir", metavar="DIR",
2179
help="Directory to save/restore state in")
2180
2181
options = parser.parse_args()
682
2182
683
2183
if options.check:
684
2184
import doctest
693
2193
"priority":
694
2194
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
695
2195
"servicename": "Mandos",
2196
"use_dbus": "True",
2197
"use_ipv6": "True",
2198
"debuglevel": "",
2199
"restore": "True",
2200
"statedir": "/var/lib/mandos"
696
2201
}
697
2202
698
2203
# Parse config file for server-global settings
699
server_config = ConfigParser.SafeConfigParser(server_defaults)
2204
server_config = configparser.SafeConfigParser(server_defaults)
700
2205
del server_defaults
701
server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
server_section = "server"
2206
server_config.read(os.path.join(options.configdir,
2207
"mandos.conf"))
703
2208
# 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")
2209
server_settings = server_config.defaults()
2210
# Use the appropriate methods on the non-string config options
2211
for option in ("debug", "use_dbus", "use_ipv6"):
2212
server_settings[option] = server_config.getboolean("DEFAULT",
2213
option)
2214
if server_settings["port"]:
2215
server_settings["port"] = server_config.getint("DEFAULT",
2216
"port")
708
2217
del server_config
709
2218
710
2219
# Override the settings from the config file with command line
711
2220
# options, if set.
712
2221
for option in ("interface", "address", "port", "debug",
713
"priority", "servicename", "configdir"):
2222
"priority", "servicename", "configdir",
2223
"use_dbus", "use_ipv6", "debuglevel", "restore",
2224
"statedir"):
714
2225
value = getattr(options, option)
715
2226
if value is not None:
716
2227
server_settings[option] = value
717
2228
del options
2229
# Force all strings to be unicode
2230
for option in server_settings.keys():
2231
if type(server_settings[option]) is str:
2232
server_settings[option] = unicode(server_settings[option])
718
2233
# Now we have our good server settings in "server_settings"
719
2234
2235
##################################################################
2236
2237
# For convenience
720
2238
debug = server_settings["debug"]
2239
debuglevel = server_settings["debuglevel"]
2240
use_dbus = server_settings["use_dbus"]
2241
use_ipv6 = server_settings["use_ipv6"]
2242
stored_state_path = os.path.join(server_settings["statedir"],
2243
stored_state_file)
721
2244
722
if not debug:
723
syslogger.setLevel(logging.WARNING)
724
console.setLevel(logging.WARNING)
2245
if debug:
2246
initlogger(debug, logging.DEBUG)
2247
else:
2248
if not debuglevel:
2249
initlogger(debug)
2250
else:
2251
level = getattr(logging, debuglevel.upper())
2252
initlogger(debug, level)
725
2253
726
2254
if server_settings["servicename"] != "Mandos":
727
syslogger.setFormatter(logging.Formatter\
728
('Mandos (%s): %%(levelname)s:'
729
' %%(message)s'
730
% server_settings["servicename"]))
2255
syslogger.setFormatter(logging.Formatter
2256
('Mandos ({0}) [%(process)d]:'
2257
' %(levelname)s: %(message)s'
2258
.format(server_settings
2259
["servicename"])))
731
2260
732
2261
# Parse config file with clients
733
client_defaults = { "timeout": "1h",
734
"interval": "5m",
735
"checker": "fping -q -- %%(host)s",
736
}
737
client_config = ConfigParser.SafeConfigParser(client_defaults)
2262
client_config = configparser.SafeConfigParser(Client
2263
.client_defaults)
738
2264
client_config.read(os.path.join(server_settings["configdir"],
739
2265
"clients.conf"))
740
2266
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"])
2267
global mandos_dbus_service
2268
mandos_dbus_service = None
2269
2270
tcp_server = MandosServer((server_settings["address"],
2271
server_settings["port"]),
2272
ClientHandler,
2273
interface=(server_settings["interface"]
2274
or None),
2275
use_ipv6=use_ipv6,
2276
gnutls_priority=
2277
server_settings["priority"],
2278
use_dbus=use_dbus)
2279
if not debug:
2280
pidfilename = "/var/run/mandos.pid"
2281
try:
2282
pidfile = open(pidfilename, "w")
2283
except IOError as e:
2284
logger.error("Could not open file %r", pidfilename,
2285
exc_info=e)
2286
2287
for name in ("_mandos", "mandos", "nobody"):
2288
try:
2289
uid = pwd.getpwnam(name).pw_uid
2290
gid = pwd.getpwnam(name).pw_gid
2291
break
2292
except KeyError:
2293
continue
2294
else:
2295
uid = 65534
2296
gid = 65534
2297
try:
2298
os.setgid(gid)
2299
os.setuid(uid)
2300
except OSError as error:
2301
if error[0] != errno.EPERM:
2302
raise error
2303
2304
if debug:
2305
# Enable all possible GnuTLS debugging
2306
2307
# "Use a log level over 10 to enable all debugging options."
2308
# - GnuTLS manual
2309
gnutls.library.functions.gnutls_global_set_log_level(11)
2310
2311
@gnutls.library.types.gnutls_log_func
2312
def debug_gnutls(level, string):
2313
logger.debug("GnuTLS: %s", string[:-1])
2314
2315
(gnutls.library.functions
2316
.gnutls_global_set_log_function(debug_gnutls))
2317
2318
# Redirect stdin so all checkers get /dev/null
2319
null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2320
os.dup2(null, sys.stdin.fileno())
2321
if null > 2:
2322
os.close(null)
2323
2324
# Need to fork before connecting to D-Bus
2325
if not debug:
2326
# Close all input and output, do double fork, etc.
2327
daemon()
2328
2329
gobject.threads_init()
746
2330
747
2331
global main_loop
748
global bus
749
global server
750
2332
# From the Avahi example code
751
DBusGMainLoop(set_as_default=True )
2333
DBusGMainLoop(set_as_default=True)
752
2334
main_loop = gobject.MainLoop()
753
2335
bus = dbus.SystemBus()
754
server = dbus.Interface(
755
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
avahi.DBUS_INTERFACE_SERVER )
757
2336
# 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)
2337
if use_dbus:
2338
try:
2339
bus_name = dbus.service.BusName("se.recompile.Mandos",
2340
bus, do_not_queue=True)
2341
old_bus_name = (dbus.service.BusName
2342
("se.bsnet.fukt.Mandos", bus,
2343
do_not_queue=True))
2344
except dbus.exceptions.NameExistsException as e:
2345
logger.error("Disabling D-Bus:", exc_info=e)
2346
use_dbus = False
2347
server_settings["use_dbus"] = False
2348
tcp_server.use_dbus = False
2349
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2350
service = AvahiServiceToSyslog(name =
2351
server_settings["servicename"],
2352
servicetype = "_mandos._tcp",
2353
protocol = protocol, bus = bus)
2354
if server_settings["interface"]:
2355
service.interface = (if_nametoindex
2356
(str(server_settings["interface"])))
2357
2358
global multiprocessing_manager
2359
multiprocessing_manager = multiprocessing.Manager()
2360
2361
client_class = Client
2362
if use_dbus:
2363
client_class = functools.partial(ClientDBus, bus = bus)
2364
2365
client_settings = Client.config_parser(client_config)
2366
old_client_settings = {}
2367
clients_data = {}
2368
2369
# Get client data and settings from last running state.
2370
if server_settings["restore"]:
2371
try:
2372
with open(stored_state_path, "rb") as stored_state:
2373
clients_data, old_client_settings = (pickle.load
2374
(stored_state))
2375
os.remove(stored_state_path)
2376
except IOError as e:
2377
if e.errno == errno.ENOENT:
2378
logger.warning("Could not load persistent state: {0}"
2379
.format(os.strerror(e.errno)))
2380
else:
2381
logger.critical("Could not load persistent state:",
2382
exc_info=e)
2383
raise
2384
except EOFError as e:
2385
logger.warning("Could not load persistent state: "
2386
"EOFError:", exc_info=e)
2387
2388
with PGPEngine() as pgp:
2389
for client_name, client in clients_data.iteritems():
2390
# Decide which value to use after restoring saved state.
2391
# We have three different values: Old config file,
2392
# new config file, and saved state.
2393
# New config value takes precedence if it differs from old
2394
# config value, otherwise use saved state.
2395
for name, value in client_settings[client_name].items():
2396
try:
2397
# For each value in new config, check if it
2398
# differs from the old config value (Except for
2399
# the "secret" attribute)
2400
if (name != "secret" and
2401
value != old_client_settings[client_name]
2402
[name]):
2403
client[name] = value
2404
except KeyError:
2405
pass
2406
2407
# Clients who has passed its expire date can still be
2408
# enabled if its last checker was successful. Clients
2409
# whose checker succeeded before we stored its state is
2410
# assumed to have successfully run all checkers during
2411
# downtime.
2412
if client["enabled"]:
2413
if datetime.datetime.utcnow() >= client["expires"]:
2414
if not client["last_checked_ok"]:
2415
logger.warning(
2416
"disabling client {0} - Client never "
2417
"performed a successful checker"
2418
.format(client_name))
2419
client["enabled"] = False
2420
elif client["last_checker_status"] != 0:
2421
logger.warning(
2422
"disabling client {0} - Client "
2423
"last checker failed with error code {1}"
2424
.format(client_name,
2425
client["last_checker_status"]))
2426
client["enabled"] = False
2427
else:
2428
client["expires"] = (datetime.datetime
2429
.utcnow()
2430
+ client["timeout"])
2431
logger.debug("Last checker succeeded,"
2432
" keeping {0} enabled"
2433
.format(client_name))
2434
try:
2435
client["secret"] = (
2436
pgp.decrypt(client["encrypted_secret"],
2437
client_settings[client_name]
2438
["secret"]))
2439
except PGPError:
2440
# If decryption fails, we use secret from new settings
2441
logger.debug("Failed to decrypt {0} old secret"
2442
.format(client_name))
2443
client["secret"] = (
2444
client_settings[client_name]["secret"])
2445
2446
# Add/remove clients based on new changes made to config
2447
for client_name in (set(old_client_settings)
2448
- set(client_settings)):
2449
del clients_data[client_name]
2450
for client_name in (set(client_settings)
2451
- set(old_client_settings)):
2452
clients_data[client_name] = client_settings[client_name]
2453
2454
# Create all client objects
2455
for client_name, client in clients_data.iteritems():
2456
tcp_server.clients[client_name] = client_class(
2457
name = client_name, settings = client)
2458
2459
if not tcp_server.clients:
2460
logger.warning("No clients defined")
774
2461
775
2462
if not debug:
776
logger.removeHandler(console)
777
daemon()
778
779
pidfilename = "/var/run/mandos/mandos.pid"
780
pid = os.getpid()
781
try:
782
pidfile = open(pidfilename, "w")
783
pidfile.write(str(pid) + "\n")
784
pidfile.close()
785
del pidfile
786
except IOError, err:
787
logger.error(u"Could not write %s file with PID %d",
788
pidfilename, os.getpid())
2463
try:
2464
with pidfile:
2465
pid = os.getpid()
2466
pidfile.write(str(pid) + "\n".encode("utf-8"))
2467
del pidfile
2468
except IOError:
2469
logger.error("Could not write to file %r with PID %d",
2470
pidfilename, pid)
2471
except NameError:
2472
# "pidfile" was never created
2473
pass
2474
del pidfilename
2475
signal.signal(signal.SIGINT, signal.SIG_IGN)
2476
2477
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2478
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2479
2480
if use_dbus:
2481
@alternate_dbus_interfaces({"se.recompile.Mandos":
2482
"se.bsnet.fukt.Mandos"})
2483
class MandosDBusService(DBusObjectWithProperties):
2484
"""A D-Bus proxy object"""
2485
def __init__(self):
2486
dbus.service.Object.__init__(self, bus, "/")
2487
_interface = "se.recompile.Mandos"
2488
2489
@dbus_interface_annotations(_interface)
2490
def _foo(self):
2491
return { "org.freedesktop.DBus.Property"
2492
".EmitsChangedSignal":
2493
"false"}
2494
2495
@dbus.service.signal(_interface, signature="o")
2496
def ClientAdded(self, objpath):
2497
"D-Bus signal"
2498
pass
2499
2500
@dbus.service.signal(_interface, signature="ss")
2501
def ClientNotFound(self, fingerprint, address):
2502
"D-Bus signal"
2503
pass
2504
2505
@dbus.service.signal(_interface, signature="os")
2506
def ClientRemoved(self, objpath, name):
2507
"D-Bus signal"
2508
pass
2509
2510
@dbus.service.method(_interface, out_signature="ao")
2511
def GetAllClients(self):
2512
"D-Bus method"
2513
return dbus.Array(c.dbus_object_path
2514
for c in
2515
tcp_server.clients.itervalues())
2516
2517
@dbus.service.method(_interface,
2518
out_signature="a{oa{sv}}")
2519
def GetAllClientsWithProperties(self):
2520
"D-Bus method"
2521
return dbus.Dictionary(
2522
((c.dbus_object_path, c.GetAll(""))
2523
for c in tcp_server.clients.itervalues()),
2524
signature="oa{sv}")
2525
2526
@dbus.service.method(_interface, in_signature="o")
2527
def RemoveClient(self, object_path):
2528
"D-Bus method"
2529
for c in tcp_server.clients.itervalues():
2530
if c.dbus_object_path == object_path:
2531
del tcp_server.clients[c.name]
2532
c.remove_from_connection()
2533
# Don't signal anything except ClientRemoved
2534
c.disable(quiet=True)
2535
# Emit D-Bus signal
2536
self.ClientRemoved(object_path, c.name)
2537
return
2538
raise KeyError(object_path)
2539
2540
del _interface
2541
2542
mandos_dbus_service = MandosDBusService()
789
2543
790
2544
def cleanup():
791
2545
"Cleanup function; run on exit"
792
global group
793
# From the Avahi example code
794
if not group is None:
795
group.Free()
796
group = None
797
# End of Avahi example code
798
799
while clients:
800
client = clients.pop()
801
client.stop_hook = None
802
client.stop()
2546
service.cleanup()
2547
2548
multiprocessing.active_children()
2549
if not (tcp_server.clients or client_settings):
2550
return
2551
2552
# Store client before exiting. Secrets are encrypted with key
2553
# based on what config file has. If config file is
2554
# removed/edited, old secret will thus be unrecovable.
2555
clients = {}
2556
with PGPEngine() as pgp:
2557
for client in tcp_server.clients.itervalues():
2558
key = client_settings[client.name]["secret"]
2559
client.encrypted_secret = pgp.encrypt(client.secret,
2560
key)
2561
client_dict = {}
2562
2563
# A list of attributes that can not be pickled
2564
# + secret.
2565
exclude = set(("bus", "changedstate", "secret",
2566
"checker"))
2567
for name, typ in (inspect.getmembers
2568
(dbus.service.Object)):
2569
exclude.add(name)
2570
2571
client_dict["encrypted_secret"] = (client
2572
.encrypted_secret)
2573
for attr in client.client_structure:
2574
if attr not in exclude:
2575
client_dict[attr] = getattr(client, attr)
2576
2577
clients[client.name] = client_dict
2578
del client_settings[client.name]["secret"]
2579
2580
try:
2581
tempfd, tempname = tempfile.mkstemp(suffix=".pickle",
2582
prefix="clients-",
2583
dir=os.path.dirname
2584
(stored_state_path))
2585
with os.fdopen(tempfd, "wb") as stored_state:
2586
pickle.dump((clients, client_settings), stored_state)
2587
os.rename(tempname, stored_state_path)
2588
except (IOError, OSError) as e:
2589
if not debug:
2590
try:
2591
os.remove(tempname)
2592
except NameError:
2593
pass
2594
if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
2595
logger.warning("Could not save persistent state: {0}"
2596
.format(os.strerror(e.errno)))
2597
else:
2598
logger.warning("Could not save persistent state:",
2599
exc_info=e)
2600
raise e
2601
2602
# Delete all clients, and settings from config
2603
while tcp_server.clients:
2604
name, client = tcp_server.clients.popitem()
2605
if use_dbus:
2606
client.remove_from_connection()
2607
# Don't signal anything except ClientRemoved
2608
client.disable(quiet=True)
2609
if use_dbus:
2610
# Emit D-Bus signal
2611
mandos_dbus_service.ClientRemoved(client
2612
.dbus_object_path,
2613
client.name)
2614
client_settings.clear()
803
2615
804
2616
atexit.register(cleanup)
805
2617
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)
2618
for client in tcp_server.clients.itervalues():
2619
if use_dbus:
2620
# Emit D-Bus signal
2621
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2622
# Need to initiate checking of clients
2623
if client.enabled:
2624
client.init_checker()
2625
2626
tcp_server.enable()
2627
tcp_server.server_activate()
2628
819
2629
# Find out what port we got
820
2630
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())
2631
if use_ipv6:
2632
logger.info("Now listening on address %r, port %d,"
2633
" flowinfo %d, scope_id %d",
2634
*tcp_server.socket.getsockname())
2635
else: # IPv4
2636
logger.info("Now listening on address %r, port %d",
2637
*tcp_server.socket.getsockname())
823
2638
824
2639
#service.interface = tcp_server.socket.getsockname()[3]
825
2640
826
2641
try:
827
2642
# From the Avahi example code
828
server.connect_to_signal("StateChanged", server_state_changed)
829
2643
try:
830
server_state_changed(server.GetState())
831
except dbus.exceptions.DBusException, error:
832
logger.critical(u"DBusException: %s", error)
2644
service.activate()
2645
except dbus.exceptions.DBusException as error:
2646
logger.critical("D-Bus Exception", exc_info=error)
2647
cleanup()
833
2648
sys.exit(1)
834
2649
# End of Avahi example code
835
2650
836
2651
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
2652
lambda *args, **kwargs:
838
tcp_server.handle_request\
839
(*args[2:], **kwargs) or True)
2653
(tcp_server.handle_request
2654
(*args[2:], **kwargs) or True))
840
2655
841
logger.debug(u"Starting main loop")
842
main_loop_started = True
2656
logger.debug("Starting main loop")
843
2657
main_loop.run()
844
except AvahiError, error:
845
logger.critical(u"AvahiError: %s" + unicode(error))
2658
except AvahiError as error:
2659
logger.critical("Avahi Error", exc_info=error)
2660
cleanup()
846
2661
sys.exit(1)
847
2662
except KeyboardInterrupt:
848
2663
if debug:
849
print
2664
print("", file=sys.stderr)
2665
logger.debug("Server received KeyboardInterrupt")
2666
logger.debug("Server exiting")
2667
# Must run before the D-Bus bus name gets deregistered
2668
cleanup()
850
2669
851
2670
if __name__ == '__main__':
852
2671
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0