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- Committer: Teddy Hogeborn
- Date: 2016-02-28 03:01:43 UTC
- Revision ID: teddy@recompile.se-20160228030143-i6w90r7wzkvlx9kq
Stop using python-gnutls. Use GnuTLS 3.3 or later directly.
* INSTALL: Document dependency on GnuTLS 3.3 and remove dependency on
Python-GnuTLS.
* debian/control (Source: mandos/Build-Depends): Add (>= 3.3.0) to
"libgnutls28-dev" and
"gnutls-dev".
(Source: mandos/Build-Depends-Indep): Remove "python2.7-gnutls".
(Package: mandos/Depends): Remove "python-gnutls" and
"python2.7-gnutls", add "libgnutls28-dev
(>= 3.3.0) | libgnutls30 (>= 3.3.0)"
* mandos: Remove imports of "gnutls" and all submodules.
(GnuTLS, gnutls): New; simulate a "gnutls" module. Change all
callers to match new shorter names.
* INSTALL: Document dependency on GnuTLS 3.3 and remove dependency on
Python-GnuTLS.
* debian/control (Source: mandos/Build-Depends): Add (>= 3.3.0) to
"libgnutls28-dev" and
"gnutls-dev".
(Source: mandos/Build-Depends-Indep): Remove "python2.7-gnutls".
(Package: mandos/Depends): Remove "python-gnutls" and
"python2.7-gnutls", add "libgnutls28-dev
(>= 3.3.0) | libgnutls30 (>= 3.3.0)"
* mandos: Remove imports of "gnutls" and all submodules.
(GnuTLS, gnutls): New; simulate a "gnutls" module. Change all
callers to match new shorter names.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
mandos
1
#!/usr/bin/python
1
#!/usr/bin/python2.7
2
2
# -*- mode: python; coding: utf-8 -*-
3
3
#
4
4
# Mandos server - give out binary blobs to connecting clients.
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 © 2008-2015 Teddy Hogeborn
15
# Copyright © 2008-2015 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
27
28
# along with this program. If not, see
28
29
# <http://www.gnu.org/licenses/>.
29
30
#
30
# Contact the authors at <mandos@fukt.bsnet.se>.
31
# Contact the authors at <mandos@recompile.se>.
31
32
#
32
33
33
from __future__ import division
34
35
import SocketServer
34
from __future__ import (division, absolute_import, print_function,
35
unicode_literals)
36
37
from future_builtins import *
38
39
try:
40
import SocketServer as socketserver
41
except ImportError:
42
import socketserver
36
43
import socket
37
import select
38
from optparse import OptionParser
44
import argparse
39
45
import datetime
40
46
import errno
41
import gnutls.crypto
42
import gnutls.connection
43
import gnutls.errors
44
import gnutls.library.functions
45
import gnutls.library.constants
46
import gnutls.library.types
47
import ConfigParser
47
try:
48
import ConfigParser as configparser
49
except ImportError:
50
import configparser
48
51
import sys
49
52
import re
50
53
import os
51
54
import signal
52
from sets import Set
53
55
import subprocess
54
56
import atexit
55
57
import stat
56
58
import logging
57
59
import logging.handlers
60
import pwd
61
import contextlib
62
import struct
63
import fcntl
64
import functools
65
try:
66
import cPickle as pickle
67
except ImportError:
68
import pickle
69
import multiprocessing
70
import types
71
import binascii
72
import tempfile
73
import itertools
74
import collections
75
import codecs
58
76
59
77
import dbus
60
import gobject
78
import dbus.service
79
try:
80
import gobject
81
except ImportError:
82
from gi.repository import GObject as gobject
61
83
import avahi
62
84
from dbus.mainloop.glib import DBusGMainLoop
63
85
import ctypes
64
65
version = "1.0"
66
67
logger = logging.Logger('mandos')
68
syslogger = logging.handlers.SysLogHandler\
69
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
70
address = "/dev/log")
71
syslogger.setFormatter(logging.Formatter\
72
('Mandos: %(levelname)s: %(message)s'))
73
logger.addHandler(syslogger)
74
75
console = logging.StreamHandler()
76
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
77
' %(message)s'))
78
logger.addHandler(console)
86
import ctypes.util
87
import xml.dom.minidom
88
import inspect
89
90
try:
91
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
92
except AttributeError:
93
try:
94
from IN import SO_BINDTODEVICE
95
except ImportError:
96
SO_BINDTODEVICE = None
97
98
if sys.version_info.major == 2:
99
str = unicode
100
101
version = "1.7.1"
102
stored_state_file = "clients.pickle"
103
104
logger = logging.getLogger()
105
syslogger = None
106
107
try:
108
if_nametoindex = ctypes.cdll.LoadLibrary(
109
ctypes.util.find_library("c")).if_nametoindex
110
except (OSError, AttributeError):
111
112
def if_nametoindex(interface):
113
"Get an interface index the hard way, i.e. using fcntl()"
114
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
115
with contextlib.closing(socket.socket()) as s:
116
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
117
struct.pack(b"16s16x", interface))
118
interface_index = struct.unpack("I", ifreq[16:20])[0]
119
return interface_index
120
121
122
def initlogger(debug, level=logging.WARNING):
123
"""init logger and add loglevel"""
124
125
global syslogger
126
syslogger = (logging.handlers.SysLogHandler(
127
facility = logging.handlers.SysLogHandler.LOG_DAEMON,
128
address = "/dev/log"))
129
syslogger.setFormatter(logging.Formatter
130
('Mandos [%(process)d]: %(levelname)s:'
131
' %(message)s'))
132
logger.addHandler(syslogger)
133
134
if debug:
135
console = logging.StreamHandler()
136
console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
137
' [%(process)d]:'
138
' %(levelname)s:'
139
' %(message)s'))
140
logger.addHandler(console)
141
logger.setLevel(level)
142
143
144
class PGPError(Exception):
145
"""Exception if encryption/decryption fails"""
146
pass
147
148
149
class PGPEngine(object):
150
"""A simple class for OpenPGP symmetric encryption & decryption"""
151
152
def __init__(self):
153
self.tempdir = tempfile.mkdtemp(prefix="mandos-")
154
self.gnupgargs = ['--batch',
155
'--home', self.tempdir,
156
'--force-mdc',
157
'--quiet',
158
'--no-use-agent']
159
160
def __enter__(self):
161
return self
162
163
def __exit__(self, exc_type, exc_value, traceback):
164
self._cleanup()
165
return False
166
167
def __del__(self):
168
self._cleanup()
169
170
def _cleanup(self):
171
if self.tempdir is not None:
172
# Delete contents of tempdir
173
for root, dirs, files in os.walk(self.tempdir,
174
topdown = False):
175
for filename in files:
176
os.remove(os.path.join(root, filename))
177
for dirname in dirs:
178
os.rmdir(os.path.join(root, dirname))
179
# Remove tempdir
180
os.rmdir(self.tempdir)
181
self.tempdir = None
182
183
def password_encode(self, password):
184
# Passphrase can not be empty and can not contain newlines or
185
# NUL bytes. So we prefix it and hex encode it.
186
encoded = b"mandos" + binascii.hexlify(password)
187
if len(encoded) > 2048:
188
# GnuPG can't handle long passwords, so encode differently
189
encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
190
.replace(b"\n", b"\\n")
191
.replace(b"\0", b"\\x00"))
192
return encoded
193
194
def encrypt(self, data, password):
195
passphrase = self.password_encode(password)
196
with tempfile.NamedTemporaryFile(
197
dir=self.tempdir) as passfile:
198
passfile.write(passphrase)
199
passfile.flush()
200
proc = subprocess.Popen(['gpg', '--symmetric',
201
'--passphrase-file',
202
passfile.name]
203
+ self.gnupgargs,
204
stdin = subprocess.PIPE,
205
stdout = subprocess.PIPE,
206
stderr = subprocess.PIPE)
207
ciphertext, err = proc.communicate(input = data)
208
if proc.returncode != 0:
209
raise PGPError(err)
210
return ciphertext
211
212
def decrypt(self, data, password):
213
passphrase = self.password_encode(password)
214
with tempfile.NamedTemporaryFile(
215
dir = self.tempdir) as passfile:
216
passfile.write(passphrase)
217
passfile.flush()
218
proc = subprocess.Popen(['gpg', '--decrypt',
219
'--passphrase-file',
220
passfile.name]
221
+ self.gnupgargs,
222
stdin = subprocess.PIPE,
223
stdout = subprocess.PIPE,
224
stderr = subprocess.PIPE)
225
decrypted_plaintext, err = proc.communicate(input = data)
226
if proc.returncode != 0:
227
raise PGPError(err)
228
return decrypted_plaintext
229
79
230
80
231
class AvahiError(Exception):
81
def __init__(self, value):
232
def __init__(self, value, *args, **kwargs):
82
233
self.value = value
83
def __str__(self):
84
return repr(self.value)
234
return super(AvahiError, self).__init__(value, *args,
235
**kwargs)
236
85
237
86
238
class AvahiServiceError(AvahiError):
87
239
pass
88
240
241
89
242
class AvahiGroupError(AvahiError):
90
243
pass
91
244
92
245
93
246
class AvahiService(object):
94
247
"""An Avahi (Zeroconf) service.
248
95
249
Attributes:
96
250
interface: integer; avahi.IF_UNSPEC or an interface index.
97
251
Used to optionally bind to the specified interface.
98
252
name: string; Example: 'Mandos'
99
253
type: string; Example: '_mandos._tcp'.
100
See <http://www.dns-sd.org/ServiceTypes.html>
254
See <https://www.iana.org/assignments/service-names-port-numbers>
101
255
port: integer; what port to announce
102
256
TXT: list of strings; TXT record for the service
103
257
domain: string; Domain to publish on, default to .local if empty.
105
259
max_renames: integer; maximum number of renames
106
260
rename_count: integer; counter so we only rename after collisions
107
261
a sensible number of times
262
group: D-Bus Entry Group
263
server: D-Bus Server
264
bus: dbus.SystemBus()
108
265
"""
109
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
110
type = None, port = None, TXT = None, domain = "",
111
host = "", max_renames = 32768):
266
267
def __init__(self,
268
interface = avahi.IF_UNSPEC,
269
name = None,
270
servicetype = None,
271
port = None,
272
TXT = None,
273
domain = "",
274
host = "",
275
max_renames = 32768,
276
protocol = avahi.PROTO_UNSPEC,
277
bus = None):
112
278
self.interface = interface
113
279
self.name = name
114
self.type = type
280
self.type = servicetype
115
281
self.port = port
116
if TXT is None:
117
self.TXT = []
118
else:
119
self.TXT = TXT
282
self.TXT = TXT if TXT is not None else []
120
283
self.domain = domain
121
284
self.host = host
122
285
self.rename_count = 0
123
286
self.max_renames = max_renames
124
def rename(self):
287
self.protocol = protocol
288
self.group = None # our entry group
289
self.server = None
290
self.bus = bus
291
self.entry_group_state_changed_match = None
292
293
def rename(self, remove=True):
125
294
"""Derived from the Avahi example code"""
126
295
if self.rename_count >= self.max_renames:
127
logger.critical(u"No suitable Zeroconf service name found"
128
u" after %i retries, exiting.",
129
rename_count)
296
logger.critical("No suitable Zeroconf service name found"
297
" after %i retries, exiting.",
298
self.rename_count)
130
299
raise AvahiServiceError("Too many renames")
131
self.name = server.GetAlternativeServiceName(self.name)
132
logger.info(u"Changing Zeroconf service name to %r ...",
133
str(self.name))
134
syslogger.setFormatter(logging.Formatter\
135
('Mandos (%s): %%(levelname)s:'
136
' %%(message)s' % self.name))
137
self.remove()
138
self.add()
300
self.name = str(
301
self.server.GetAlternativeServiceName(self.name))
139
302
self.rename_count += 1
303
logger.info("Changing Zeroconf service name to %r ...",
304
self.name)
305
if remove:
306
self.remove()
307
try:
308
self.add()
309
except dbus.exceptions.DBusException as error:
310
if (error.get_dbus_name()
311
== "org.freedesktop.Avahi.CollisionError"):
312
logger.info("Local Zeroconf service name collision.")
313
return self.rename(remove=False)
314
else:
315
logger.critical("D-Bus Exception", exc_info=error)
316
self.cleanup()
317
os._exit(1)
318
140
319
def remove(self):
141
320
"""Derived from the Avahi example code"""
142
if group is not None:
143
group.Reset()
321
if self.entry_group_state_changed_match is not None:
322
self.entry_group_state_changed_match.remove()
323
self.entry_group_state_changed_match = None
324
if self.group is not None:
325
self.group.Reset()
326
144
327
def add(self):
145
328
"""Derived from the Avahi example code"""
146
global group
147
if group is None:
148
group = dbus.Interface\
149
(bus.get_object(avahi.DBUS_NAME,
150
server.EntryGroupNew()),
151
avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
group.connect_to_signal('StateChanged',
153
entry_group_state_changed)
154
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
155
service.name, service.type)
156
group.AddService(
157
self.interface, # interface
158
avahi.PROTO_INET6, # protocol
159
dbus.UInt32(0), # flags
160
self.name, self.type,
161
self.domain, self.host,
162
dbus.UInt16(self.port),
163
avahi.string_array_to_txt_array(self.TXT))
164
group.Commit()
165
166
# From the Avahi example code:
167
group = None # our entry group
168
# End of Avahi example code
169
329
self.remove()
330
if self.group is None:
331
self.group = dbus.Interface(
332
self.bus.get_object(avahi.DBUS_NAME,
333
self.server.EntryGroupNew()),
334
avahi.DBUS_INTERFACE_ENTRY_GROUP)
335
self.entry_group_state_changed_match = (
336
self.group.connect_to_signal(
337
'StateChanged', self.entry_group_state_changed))
338
logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
339
self.name, self.type)
340
self.group.AddService(
341
self.interface,
342
self.protocol,
343
dbus.UInt32(0), # flags
344
self.name, self.type,
345
self.domain, self.host,
346
dbus.UInt16(self.port),
347
avahi.string_array_to_txt_array(self.TXT))
348
self.group.Commit()
349
350
def entry_group_state_changed(self, state, error):
351
"""Derived from the Avahi example code"""
352
logger.debug("Avahi entry group state change: %i", state)
353
354
if state == avahi.ENTRY_GROUP_ESTABLISHED:
355
logger.debug("Zeroconf service established.")
356
elif state == avahi.ENTRY_GROUP_COLLISION:
357
logger.info("Zeroconf service name collision.")
358
self.rename()
359
elif state == avahi.ENTRY_GROUP_FAILURE:
360
logger.critical("Avahi: Error in group state changed %s",
361
str(error))
362
raise AvahiGroupError("State changed: {!s}".format(error))
363
364
def cleanup(self):
365
"""Derived from the Avahi example code"""
366
if self.group is not None:
367
try:
368
self.group.Free()
369
except (dbus.exceptions.UnknownMethodException,
370
dbus.exceptions.DBusException):
371
pass
372
self.group = None
373
self.remove()
374
375
def server_state_changed(self, state, error=None):
376
"""Derived from the Avahi example code"""
377
logger.debug("Avahi server state change: %i", state)
378
bad_states = {
379
avahi.SERVER_INVALID: "Zeroconf server invalid",
380
avahi.SERVER_REGISTERING: None,
381
avahi.SERVER_COLLISION: "Zeroconf server name collision",
382
avahi.SERVER_FAILURE: "Zeroconf server failure",
383
}
384
if state in bad_states:
385
if bad_states[state] is not None:
386
if error is None:
387
logger.error(bad_states[state])
388
else:
389
logger.error(bad_states[state] + ": %r", error)
390
self.cleanup()
391
elif state == avahi.SERVER_RUNNING:
392
try:
393
self.add()
394
except dbus.exceptions.DBusException as error:
395
if (error.get_dbus_name()
396
== "org.freedesktop.Avahi.CollisionError"):
397
logger.info("Local Zeroconf service name"
398
" collision.")
399
return self.rename(remove=False)
400
else:
401
logger.critical("D-Bus Exception", exc_info=error)
402
self.cleanup()
403
os._exit(1)
404
else:
405
if error is None:
406
logger.debug("Unknown state: %r", state)
407
else:
408
logger.debug("Unknown state: %r: %r", state, error)
409
410
def activate(self):
411
"""Derived from the Avahi example code"""
412
if self.server is None:
413
self.server = dbus.Interface(
414
self.bus.get_object(avahi.DBUS_NAME,
415
avahi.DBUS_PATH_SERVER,
416
follow_name_owner_changes=True),
417
avahi.DBUS_INTERFACE_SERVER)
418
self.server.connect_to_signal("StateChanged",
419
self.server_state_changed)
420
self.server_state_changed(self.server.GetState())
421
422
423
class AvahiServiceToSyslog(AvahiService):
424
def rename(self, *args, **kwargs):
425
"""Add the new name to the syslog messages"""
426
ret = AvahiService.rename(self, *args, **kwargs)
427
syslogger.setFormatter(logging.Formatter(
428
'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
429
.format(self.name)))
430
return ret
431
432
# Pretend that we have a GnuTLS module
433
class GnuTLS(object):
434
"""This isn't so much a class as it is a module-like namespace.
435
It is instantiated once, and simulates having a GnuTLS module."""
436
437
_library = ctypes.cdll.LoadLibrary(
438
ctypes.util.find_library("gnutls"))
439
_need_version = "3.3.0"
440
def __init__(self):
441
# Need to use class name "GnuTLS" here, since this method is
442
# called before the assignment to the "gnutls" global variable
443
# happens.
444
if GnuTLS.check_version(self._need_version) is None:
445
raise GnuTLS.Error("Needs GnuTLS {} or later"
446
.format(self._need_version))
447
448
# Unless otherwise indicated, the constants and types below are
449
# all from the gnutls/gnutls.h C header file.
450
451
# Constants
452
E_SUCCESS = 0
453
CRT_OPENPGP = 2
454
CLIENT = 2
455
SHUT_RDWR = 0
456
CRD_CERTIFICATE = 1
457
E_NO_CERTIFICATE_FOUND = -49
458
OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h
459
460
# Types
461
class session_int(ctypes.Structure):
462
_fields_ = []
463
session_t = ctypes.POINTER(session_int)
464
class certificate_credentials_st(ctypes.Structure):
465
_fields_ = []
466
certificate_credentials_t = ctypes.POINTER(
467
certificate_credentials_st)
468
certificate_type_t = ctypes.c_int
469
class datum_t(ctypes.Structure):
470
_fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
471
('size', ctypes.c_uint)]
472
class openpgp_crt_int(ctypes.Structure):
473
_fields_ = []
474
openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
475
openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h
476
log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
477
credentials_type_t = ctypes.c_int #
478
transport_ptr_t = ctypes.c_void_p
479
close_request_t = ctypes.c_int
480
481
# Exceptions
482
class Error(Exception):
483
# We need to use the class name "GnuTLS" here, since this
484
# exception might be raised from within GnuTLS.__init__,
485
# which is called before the assignment to the "gnutls"
486
# global variable happens.
487
def __init__(self, message = None, code = None, args=()):
488
# Default usage is by a message string, but if a return
489
# code is passed, convert it to a string with
490
# gnutls.strerror()
491
if message is None and code is not None:
492
message = GnuTLS.strerror(code)
493
return super(GnuTLS.Error, self).__init__(
494
message, *args)
495
496
class CertificateSecurityError(Error):
497
pass
498
499
# Classes
500
class Credentials(object):
501
def __init__(self):
502
self._c_object = gnutls.certificate_credentials_t()
503
gnutls.certificate_allocate_credentials(
504
ctypes.byref(self._c_object))
505
self.type = gnutls.CRD_CERTIFICATE
506
507
def __del__(self):
508
gnutls.certificate_free_credentials(self._c_object)
509
510
class ClientSession(object):
511
def __init__(self, socket, credentials = None):
512
self._c_object = gnutls.session_t()
513
gnutls.init(ctypes.byref(self._c_object), gnutls.CLIENT)
514
gnutls.set_default_priority(self._c_object)
515
gnutls.transport_set_ptr(self._c_object, socket.fileno())
516
gnutls.handshake_set_private_extensions(self._c_object,
517
True)
518
self.socket = socket
519
if credentials is None:
520
credentials = gnutls.Credentials()
521
gnutls.credentials_set(self._c_object, credentials.type,
522
ctypes.cast(credentials._c_object,
523
ctypes.c_void_p))
524
self.credentials = credentials
525
526
def __del__(self):
527
gnutls.deinit(self._c_object)
528
529
def handshake(self):
530
return gnutls.handshake(self._c_object)
531
532
def send(self, data):
533
data = bytes(data)
534
if not data:
535
return 0
536
return gnutls.record_send(self._c_object, data, len(data))
537
538
def bye(self):
539
return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
540
541
# Error handling function
542
def _error_code(result):
543
"""A function to raise exceptions on errors, suitable
544
for the 'restype' attribute on ctypes functions"""
545
if result >= 0:
546
return result
547
if result == gnutls.E_NO_CERTIFICATE_FOUND:
548
raise gnutls.CertificateSecurityError(code = result)
549
raise gnutls.Error(code = result)
550
551
# Unless otherwise indicated, the function declarations below are
552
# all from the gnutls/gnutls.h C header file.
553
554
# Functions
555
priority_set_direct = _library.gnutls_priority_set_direct
556
priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
557
ctypes.POINTER(ctypes.c_char_p)]
558
priority_set_direct.restype = _error_code
559
560
init = _library.gnutls_init
561
init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
562
init.restype = _error_code
563
564
set_default_priority = _library.gnutls_set_default_priority
565
set_default_priority.argtypes = [session_t]
566
set_default_priority.restype = _error_code
567
568
record_send = _library.gnutls_record_send
569
record_send.argtypes = [session_t, ctypes.c_void_p,
570
ctypes.c_size_t]
571
record_send.restype = ctypes.c_ssize_t
572
573
certificate_allocate_credentials = (
574
_library.gnutls_certificate_allocate_credentials)
575
certificate_allocate_credentials.argtypes = [
576
ctypes.POINTER(certificate_credentials_t)]
577
certificate_allocate_credentials.restype = _error_code
578
579
certificate_free_credentials = (
580
_library.gnutls_certificate_free_credentials)
581
certificate_free_credentials.argtypes = [certificate_credentials_t]
582
certificate_free_credentials.restype = None
583
584
handshake_set_private_extensions = (
585
_library.gnutls_handshake_set_private_extensions)
586
handshake_set_private_extensions.argtypes = [session_t,
587
ctypes.c_int]
588
handshake_set_private_extensions.restype = None
589
590
credentials_set = _library.gnutls_credentials_set
591
credentials_set.argtypes = [session_t, credentials_type_t,
592
ctypes.c_void_p]
593
credentials_set.restype = _error_code
594
595
strerror = _library.gnutls_strerror
596
strerror.argtypes = [ctypes.c_int]
597
strerror.restype = ctypes.c_char_p
598
599
certificate_type_get = _library.gnutls_certificate_type_get
600
certificate_type_get.argtypes = [session_t]
601
certificate_type_get.restype = _error_code
602
603
certificate_get_peers = _library.gnutls_certificate_get_peers
604
certificate_get_peers.argtypes = [session_t,
605
ctypes.POINTER(ctypes.c_uint)]
606
certificate_get_peers.restype = ctypes.POINTER(datum_t)
607
608
global_set_log_level = _library.gnutls_global_set_log_level
609
global_set_log_level.argtypes = [ctypes.c_int]
610
global_set_log_level.restype = None
611
612
global_set_log_function = _library.gnutls_global_set_log_function
613
global_set_log_function.argtypes = [log_func]
614
global_set_log_function.restype = None
615
616
deinit = _library.gnutls_deinit
617
deinit.argtypes = [session_t]
618
deinit.restype = None
619
620
handshake = _library.gnutls_handshake
621
handshake.argtypes = [session_t]
622
handshake.restype = _error_code
623
624
transport_set_ptr = _library.gnutls_transport_set_ptr
625
transport_set_ptr.argtypes = [session_t, transport_ptr_t]
626
transport_set_ptr.restype = None
627
628
bye = _library.gnutls_bye
629
bye.argtypes = [session_t, close_request_t]
630
bye.restype = _error_code
631
632
check_version = _library.gnutls_check_version
633
check_version.argtypes = [ctypes.c_char_p]
634
check_version.restype = ctypes.c_char_p
635
636
# All the function declarations below are from gnutls/openpgp.h
637
638
openpgp_crt_init = _library.gnutls_openpgp_crt_init
639
openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
640
openpgp_crt_init.restype = _error_code
641
642
openpgp_crt_import = _library.gnutls_openpgp_crt_import
643
openpgp_crt_import.argtypes = [openpgp_crt_t,
644
ctypes.POINTER(datum_t),
645
openpgp_crt_fmt_t]
646
openpgp_crt_import.restype = _error_code
647
648
openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
649
openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
650
ctypes.POINTER(ctypes.c_uint)]
651
openpgp_crt_verify_self.restype = _error_code
652
653
openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
654
openpgp_crt_deinit.argtypes = [openpgp_crt_t]
655
openpgp_crt_deinit.restype = None
656
657
openpgp_crt_get_fingerprint = (
658
_library.gnutls_openpgp_crt_get_fingerprint)
659
openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
660
ctypes.c_void_p,
661
ctypes.POINTER(
662
ctypes.c_size_t)]
663
openpgp_crt_get_fingerprint.restype = _error_code
664
665
# Remove non-public function
666
del _error_code
667
# Create the global "gnutls" object, simulating a module
668
gnutls = GnuTLS()
669
670
def call_pipe(connection, # : multiprocessing.Connection
671
func, *args, **kwargs):
672
"""This function is meant to be called by multiprocessing.Process
673
674
This function runs func(*args, **kwargs), and writes the resulting
675
return value on the provided multiprocessing.Connection.
676
"""
677
connection.send(func(*args, **kwargs))
678
connection.close()
170
679
171
680
class Client(object):
172
681
"""A representation of a client host served by this server.
682
173
683
Attributes:
174
name: string; from the config file, used in log messages
684
approved: bool(); 'None' if not yet approved/disapproved
685
approval_delay: datetime.timedelta(); Time to wait for approval
686
approval_duration: datetime.timedelta(); Duration of one approval
687
checker: subprocess.Popen(); a running checker process used
688
to see if the client lives.
689
'None' if no process is running.
690
checker_callback_tag: a gobject event source tag, or None
691
checker_command: string; External command which is run to check
692
if client lives. %() expansions are done at
693
runtime with vars(self) as dict, so that for
694
instance %(name)s can be used in the command.
695
checker_initiator_tag: a gobject event source tag, or None
696
created: datetime.datetime(); (UTC) object creation
697
client_structure: Object describing what attributes a client has
698
and is used for storing the client at exit
699
current_checker_command: string; current running checker_command
700
disable_initiator_tag: a gobject event source tag, or None
701
enabled: bool()
175
702
fingerprint: string (40 or 32 hexadecimal digits); used to
176
703
uniquely identify the client
177
secret: bytestring; sent verbatim (over TLS) to client
178
host: string; available for use by the checker command
179
created: datetime.datetime(); object creation, not client host
180
last_checked_ok: datetime.datetime() or None if not yet checked OK
181
timeout: datetime.timedelta(); How long from last_checked_ok
182
until this client is invalid
183
interval: datetime.timedelta(); How often to start a new checker
184
stop_hook: If set, called by stop() as stop_hook(self)
185
checker: subprocess.Popen(); a running checker process used
186
to see if the client lives.
187
'None' if no process is running.
188
checker_initiator_tag: a gobject event source tag, or None
189
stop_initiator_tag: - '' -
190
checker_callback_tag: - '' -
191
checker_command: string; External command which is run to check if
192
client lives. %() expansions are done at
193
runtime with vars(self) as dict, so that for
194
instance %(name)s can be used in the command.
195
Private attibutes:
196
_timeout: Real variable for 'timeout'
197
_interval: Real variable for 'interval'
198
_timeout_milliseconds: Used when calling gobject.timeout_add()
199
_interval_milliseconds: - '' -
704
host: string; available for use by the checker command
705
interval: datetime.timedelta(); How often to start a new checker
706
last_approval_request: datetime.datetime(); (UTC) or None
707
last_checked_ok: datetime.datetime(); (UTC) or None
708
last_checker_status: integer between 0 and 255 reflecting exit
709
status of last checker. -1 reflects crashed
710
checker, -2 means no checker completed yet.
711
last_checker_signal: The signal which killed the last checker, if
712
last_checker_status is -1
713
last_enabled: datetime.datetime(); (UTC) or None
714
name: string; from the config file, used in log messages and
715
D-Bus identifiers
716
secret: bytestring; sent verbatim (over TLS) to client
717
timeout: datetime.timedelta(); How long from last_checked_ok
718
until this client is disabled
719
extended_timeout: extra long timeout when secret has been sent
720
runtime_expansions: Allowed attributes for runtime expansion.
721
expires: datetime.datetime(); time (UTC) when a client will be
722
disabled, or None
723
server_settings: The server_settings dict from main()
200
724
"""
201
def _set_timeout(self, timeout):
202
"Setter function for 'timeout' attribute"
203
self._timeout = timeout
204
self._timeout_milliseconds = ((self.timeout.days
205
* 24 * 60 * 60 * 1000)
206
+ (self.timeout.seconds * 1000)
207
+ (self.timeout.microseconds
208
// 1000))
209
timeout = property(lambda self: self._timeout,
210
_set_timeout)
211
del _set_timeout
212
def _set_interval(self, interval):
213
"Setter function for 'interval' attribute"
214
self._interval = interval
215
self._interval_milliseconds = ((self.interval.days
216
* 24 * 60 * 60 * 1000)
217
+ (self.interval.seconds
218
* 1000)
219
+ (self.interval.microseconds
220
// 1000))
221
interval = property(lambda self: self._interval,
222
_set_interval)
223
del _set_interval
224
def __init__(self, name = None, stop_hook=None, config={}):
225
"""Note: the 'checker' key in 'config' sets the
226
'checker_command' attribute and *not* the 'checker'
227
attribute."""
725
726
runtime_expansions = ("approval_delay", "approval_duration",
727
"created", "enabled", "expires",
728
"fingerprint", "host", "interval",
729
"last_approval_request", "last_checked_ok",
730
"last_enabled", "name", "timeout")
731
client_defaults = {
732
"timeout": "PT5M",
733
"extended_timeout": "PT15M",
734
"interval": "PT2M",
735
"checker": "fping -q -- %%(host)s",
736
"host": "",
737
"approval_delay": "PT0S",
738
"approval_duration": "PT1S",
739
"approved_by_default": "True",
740
"enabled": "True",
741
}
742
743
@staticmethod
744
def config_parser(config):
745
"""Construct a new dict of client settings of this form:
746
{ client_name: {setting_name: value, ...}, ...}
747
with exceptions for any special settings as defined above.
748
NOTE: Must be a pure function. Must return the same result
749
value given the same arguments.
750
"""
751
settings = {}
752
for client_name in config.sections():
753
section = dict(config.items(client_name))
754
client = settings[client_name] = {}
755
756
client["host"] = section["host"]
757
# Reformat values from string types to Python types
758
client["approved_by_default"] = config.getboolean(
759
client_name, "approved_by_default")
760
client["enabled"] = config.getboolean(client_name,
761
"enabled")
762
763
# Uppercase and remove spaces from fingerprint for later
764
# comparison purposes with return value from the
765
# fingerprint() function
766
client["fingerprint"] = (section["fingerprint"].upper()
767
.replace(" ", ""))
768
if "secret" in section:
769
client["secret"] = section["secret"].decode("base64")
770
elif "secfile" in section:
771
with open(os.path.expanduser(os.path.expandvars
772
(section["secfile"])),
773
"rb") as secfile:
774
client["secret"] = secfile.read()
775
else:
776
raise TypeError("No secret or secfile for section {}"
777
.format(section))
778
client["timeout"] = string_to_delta(section["timeout"])
779
client["extended_timeout"] = string_to_delta(
780
section["extended_timeout"])
781
client["interval"] = string_to_delta(section["interval"])
782
client["approval_delay"] = string_to_delta(
783
section["approval_delay"])
784
client["approval_duration"] = string_to_delta(
785
section["approval_duration"])
786
client["checker_command"] = section["checker"]
787
client["last_approval_request"] = None
788
client["last_checked_ok"] = None
789
client["last_checker_status"] = -2
790
791
return settings
792
793
def __init__(self, settings, name = None, server_settings=None):
228
794
self.name = name
229
logger.debug(u"Creating client %r", self.name)
230
# Uppercase and remove spaces from fingerprint for later
231
# comparison purposes with return value from the fingerprint()
232
# function
233
self.fingerprint = config["fingerprint"].upper()\
234
.replace(u" ", u"")
235
logger.debug(u" Fingerprint: %s", self.fingerprint)
236
if "secret" in config:
237
self.secret = config["secret"].decode(u"base64")
238
elif "secfile" in config:
239
sf = open(config["secfile"])
240
self.secret = sf.read()
241
sf.close()
795
if server_settings is None:
796
server_settings = {}
797
self.server_settings = server_settings
798
# adding all client settings
799
for setting, value in settings.items():
800
setattr(self, setting, value)
801
802
if self.enabled:
803
if not hasattr(self, "last_enabled"):
804
self.last_enabled = datetime.datetime.utcnow()
805
if not hasattr(self, "expires"):
806
self.expires = (datetime.datetime.utcnow()
807
+ self.timeout)
242
808
else:
243
raise TypeError(u"No secret or secfile for client %s"
244
% self.name)
245
self.host = config.get("host", "")
246
self.created = datetime.datetime.now()
247
self.last_checked_ok = None
248
self.timeout = string_to_delta(config["timeout"])
249
self.interval = string_to_delta(config["interval"])
250
self.stop_hook = stop_hook
809
self.last_enabled = None
810
self.expires = None
811
812
logger.debug("Creating client %r", self.name)
813
logger.debug(" Fingerprint: %s", self.fingerprint)
814
self.created = settings.get("created",
815
datetime.datetime.utcnow())
816
817
# attributes specific for this server instance
251
818
self.checker = None
252
819
self.checker_initiator_tag = None
253
self.stop_initiator_tag = None
820
self.disable_initiator_tag = None
254
821
self.checker_callback_tag = None
255
self.check_command = config["checker"]
256
def start(self):
822
self.current_checker_command = None
823
self.approved = None
824
self.approvals_pending = 0
825
self.changedstate = multiprocessing_manager.Condition(
826
multiprocessing_manager.Lock())
827
self.client_structure = [attr
828
for attr in self.__dict__.iterkeys()
829
if not attr.startswith("_")]
830
self.client_structure.append("client_structure")
831
832
for name, t in inspect.getmembers(
833
type(self), lambda obj: isinstance(obj, property)):
834
if not name.startswith("_"):
835
self.client_structure.append(name)
836
837
# Send notice to process children that client state has changed
838
def send_changedstate(self):
839
with self.changedstate:
840
self.changedstate.notify_all()
841
842
def enable(self):
257
843
"""Start this client's checker and timeout hooks"""
844
if getattr(self, "enabled", False):
845
# Already enabled
846
return
847
self.expires = datetime.datetime.utcnow() + self.timeout
848
self.enabled = True
849
self.last_enabled = datetime.datetime.utcnow()
850
self.init_checker()
851
self.send_changedstate()
852
853
def disable(self, quiet=True):
854
"""Disable this client."""
855
if not getattr(self, "enabled", False):
856
return False
857
if not quiet:
858
logger.info("Disabling client %s", self.name)
859
if getattr(self, "disable_initiator_tag", None) is not None:
860
gobject.source_remove(self.disable_initiator_tag)
861
self.disable_initiator_tag = None
862
self.expires = None
863
if getattr(self, "checker_initiator_tag", None) is not None:
864
gobject.source_remove(self.checker_initiator_tag)
865
self.checker_initiator_tag = None
866
self.stop_checker()
867
self.enabled = False
868
if not quiet:
869
self.send_changedstate()
870
# Do not run this again if called by a gobject.timeout_add
871
return False
872
873
def __del__(self):
874
self.disable()
875
876
def init_checker(self):
258
877
# Schedule a new checker to be started an 'interval' from now,
259
878
# and every interval from then on.
260
self.checker_initiator_tag = gobject.timeout_add\
261
(self._interval_milliseconds,
262
self.start_checker)
879
if self.checker_initiator_tag is not None:
880
gobject.source_remove(self.checker_initiator_tag)
881
self.checker_initiator_tag = gobject.timeout_add(
882
int(self.interval.total_seconds() * 1000),
883
self.start_checker)
884
# Schedule a disable() when 'timeout' has passed
885
if self.disable_initiator_tag is not None:
886
gobject.source_remove(self.disable_initiator_tag)
887
self.disable_initiator_tag = gobject.timeout_add(
888
int(self.timeout.total_seconds() * 1000), self.disable)
263
889
# Also start a new checker *right now*.
264
890
self.start_checker()
265
# Schedule a stop() when 'timeout' has passed
266
self.stop_initiator_tag = gobject.timeout_add\
267
(self._timeout_milliseconds,
268
self.stop)
269
def stop(self):
270
"""Stop this client.
271
The possibility that a client might be restarted is left open,
272
but not currently used."""
273
# If this client doesn't have a secret, it is already stopped.
274
if hasattr(self, "secret") and self.secret:
275
logger.info(u"Stopping client %s", self.name)
276
self.secret = None
277
else:
278
return False
279
if getattr(self, "stop_initiator_tag", False):
280
gobject.source_remove(self.stop_initiator_tag)
281
self.stop_initiator_tag = None
282
if getattr(self, "checker_initiator_tag", False):
283
gobject.source_remove(self.checker_initiator_tag)
284
self.checker_initiator_tag = None
285
self.stop_checker()
286
if self.stop_hook:
287
self.stop_hook(self)
288
# Do not run this again if called by a gobject.timeout_add
289
return False
290
def __del__(self):
291
self.stop_hook = None
292
self.stop()
293
def checker_callback(self, pid, condition):
891
892
def checker_callback(self, source, condition, connection,
893
command):
294
894
"""The checker has completed, so take appropriate actions."""
295
now = datetime.datetime.now()
296
895
self.checker_callback_tag = None
297
896
self.checker = None
298
if os.WIFEXITED(condition) \
299
and (os.WEXITSTATUS(condition) == 0):
300
logger.info(u"Checker for %(name)s succeeded",
301
vars(self))
302
self.last_checked_ok = now
303
gobject.source_remove(self.stop_initiator_tag)
304
self.stop_initiator_tag = gobject.timeout_add\
305
(self._timeout_milliseconds,
306
self.stop)
307
elif not os.WIFEXITED(condition):
308
logger.warning(u"Checker for %(name)s crashed?",
897
# Read return code from connection (see call_pipe)
898
returncode = connection.recv()
899
connection.close()
900
901
if returncode >= 0:
902
self.last_checker_status = returncode
903
self.last_checker_signal = None
904
if self.last_checker_status == 0:
905
logger.info("Checker for %(name)s succeeded",
906
vars(self))
907
self.checked_ok()
908
else:
909
logger.info("Checker for %(name)s failed", vars(self))
910
else:
911
self.last_checker_status = -1
912
self.last_checker_signal = -returncode
913
logger.warning("Checker for %(name)s crashed?",
309
914
vars(self))
310
else:
311
logger.info(u"Checker for %(name)s failed",
312
vars(self))
915
return False
916
917
def checked_ok(self):
918
"""Assert that the client has been seen, alive and well."""
919
self.last_checked_ok = datetime.datetime.utcnow()
920
self.last_checker_status = 0
921
self.last_checker_signal = None
922
self.bump_timeout()
923
924
def bump_timeout(self, timeout=None):
925
"""Bump up the timeout for this client."""
926
if timeout is None:
927
timeout = self.timeout
928
if self.disable_initiator_tag is not None:
929
gobject.source_remove(self.disable_initiator_tag)
930
self.disable_initiator_tag = None
931
if getattr(self, "enabled", False):
932
self.disable_initiator_tag = gobject.timeout_add(
933
int(timeout.total_seconds() * 1000), self.disable)
934
self.expires = datetime.datetime.utcnow() + timeout
935
936
def need_approval(self):
937
self.last_approval_request = datetime.datetime.utcnow()
938
313
939
def start_checker(self):
314
940
"""Start a new checker subprocess if one is not running.
941
315
942
If a checker already exists, leave it running and do
316
943
nothing."""
317
944
# The reason for not killing a running checker is that if we
318
# did that, then if a checker (for some reason) started
319
# running slowly and taking more than 'interval' time, the
320
# client would inevitably timeout, since no checker would get
321
# a chance to run to completion. If we instead leave running
945
# did that, and if a checker (for some reason) started running
946
# slowly and taking more than 'interval' time, then the client
947
# would inevitably timeout, since no checker would get a
948
# chance to run to completion. If we instead leave running
322
949
# checkers alone, the checker would have to take more time
323
# than 'timeout' for the client to be declared invalid, which
324
# is as it should be.
950
# than 'timeout' for the client to be disabled, which is as it
951
# should be.
952
953
if self.checker is not None and not self.checker.is_alive():
954
logger.warning("Checker was not alive; joining")
955
self.checker.join()
956
self.checker = None
957
# Start a new checker if needed
325
958
if self.checker is None:
326
try:
327
# In case check_command has exactly one % operator
328
command = self.check_command % self.host
329
except TypeError:
330
# Escape attributes for the shell
331
escaped_attrs = dict((key, re.escape(str(val)))
332
for key, val in
333
vars(self).iteritems())
334
try:
335
command = self.check_command % escaped_attrs
336
except TypeError, error:
337
logger.error(u'Could not format string "%s":'
338
u' %s', self.check_command, error)
339
return True # Try again later
340
try:
341
logger.info(u"Starting checker %r for %s",
342
command, self.name)
343
# We don't need to redirect stdout and stderr, since
344
# in normal mode, that is already done by daemon(),
345
# and in debug mode we don't want to. (Stdin is
346
# always replaced by /dev/null.)
347
self.checker = subprocess.Popen(command,
348
close_fds=True,
349
shell=True, cwd="/")
350
self.checker_callback_tag = gobject.child_watch_add\
351
(self.checker.pid,
352
self.checker_callback)
353
except OSError, error:
354
logger.error(u"Failed to start subprocess: %s",
355
error)
959
# Escape attributes for the shell
960
escaped_attrs = {
961
attr: re.escape(str(getattr(self, attr)))
962
for attr in self.runtime_expansions }
963
try:
964
command = self.checker_command % escaped_attrs
965
except TypeError as error:
966
logger.error('Could not format string "%s"',
967
self.checker_command,
968
exc_info=error)
969
return True # Try again later
970
self.current_checker_command = command
971
logger.info("Starting checker %r for %s", command,
972
self.name)
973
# We don't need to redirect stdout and stderr, since
974
# in normal mode, that is already done by daemon(),
975
# and in debug mode we don't want to. (Stdin is
976
# always replaced by /dev/null.)
977
# The exception is when not debugging but nevertheless
978
# running in the foreground; use the previously
979
# created wnull.
980
popen_args = { "close_fds": True,
981
"shell": True,
982
"cwd": "/" }
983
if (not self.server_settings["debug"]
984
and self.server_settings["foreground"]):
985
popen_args.update({"stdout": wnull,
986
"stderr": wnull })
987
pipe = multiprocessing.Pipe(duplex = False)
988
self.checker = multiprocessing.Process(
989
target = call_pipe,
990
args = (pipe[1], subprocess.call, command),
991
kwargs = popen_args)
992
self.checker.start()
993
self.checker_callback_tag = gobject.io_add_watch(
994
pipe[0].fileno(), gobject.IO_IN,
995
self.checker_callback, pipe[0], command)
356
996
# Re-run this periodically if run by gobject.timeout_add
357
997
return True
998
358
999
def stop_checker(self):
359
1000
"""Force the checker process, if any, to stop."""
360
1001
if self.checker_callback_tag:
362
1003
self.checker_callback_tag = None
363
1004
if getattr(self, "checker", None) is None:
364
1005
return
365
logger.debug(u"Stopping checker for %(name)s", vars(self))
366
try:
367
os.kill(self.checker.pid, signal.SIGTERM)
368
#os.sleep(0.5)
369
#if self.checker.poll() is None:
370
# os.kill(self.checker.pid, signal.SIGKILL)
371
except OSError, error:
372
if error.errno != errno.ESRCH: # No such process
373
raise
1006
logger.debug("Stopping checker for %(name)s", vars(self))
1007
self.checker.terminate()
374
1008
self.checker = None
375
def still_valid(self):
376
"""Has the timeout not yet passed for this client?"""
377
now = datetime.datetime.now()
378
if self.last_checked_ok is None:
379
return now < (self.created + self.timeout)
380
else:
381
return now < (self.last_checked_ok + self.timeout)
382
383
384
def peer_certificate(session):
385
"Return the peer's OpenPGP certificate as a bytestring"
386
# If not an OpenPGP certificate...
387
if gnutls.library.functions.gnutls_certificate_type_get\
388
(session._c_object) \
389
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
390
# ...do the normal thing
391
return session.peer_certificate
392
list_size = ctypes.c_uint()
393
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
394
(session._c_object, ctypes.byref(list_size))
395
if list_size.value == 0:
396
return None
397
cert = cert_list[0]
398
return ctypes.string_at(cert.data, cert.size)
399
400
401
def fingerprint(openpgp):
402
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
403
# New GnuTLS "datum" with the OpenPGP public key
404
datum = gnutls.library.types.gnutls_datum_t\
405
(ctypes.cast(ctypes.c_char_p(openpgp),
406
ctypes.POINTER(ctypes.c_ubyte)),
407
ctypes.c_uint(len(openpgp)))
408
# New empty GnuTLS certificate
409
crt = gnutls.library.types.gnutls_openpgp_crt_t()
410
gnutls.library.functions.gnutls_openpgp_crt_init\
411
(ctypes.byref(crt))
412
# Import the OpenPGP public key into the certificate
413
gnutls.library.functions.gnutls_openpgp_crt_import\
414
(crt, ctypes.byref(datum),
415
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
416
# Verify the self signature in the key
417
crtverify = ctypes.c_uint();
418
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
419
(crt, 0, ctypes.byref(crtverify))
420
if crtverify.value != 0:
421
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
422
raise gnutls.errors.CertificateSecurityError("Verify failed")
423
# New buffer for the fingerprint
424
buffer = ctypes.create_string_buffer(20)
425
buffer_length = ctypes.c_size_t()
426
# Get the fingerprint from the certificate into the buffer
427
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
428
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
429
# Deinit the certificate
430
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
431
# Convert the buffer to a Python bytestring
432
fpr = ctypes.string_at(buffer, buffer_length.value)
433
# Convert the bytestring to hexadecimal notation
434
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
435
return hex_fpr
436
437
438
class tcp_handler(SocketServer.BaseRequestHandler, object):
439
"""A TCP request handler class.
440
Instantiated by IPv6_TCPServer for each request to handle it.
1009
1010
1011
def dbus_service_property(dbus_interface,
1012
signature="v",
1013
access="readwrite",
1014
byte_arrays=False):
1015
"""Decorators for marking methods of a DBusObjectWithProperties to
1016
become properties on the D-Bus.
1017
1018
The decorated method will be called with no arguments by "Get"
1019
and with one argument by "Set".
1020
1021
The parameters, where they are supported, are the same as
1022
dbus.service.method, except there is only "signature", since the
1023
type from Get() and the type sent to Set() is the same.
1024
"""
1025
# Encoding deeply encoded byte arrays is not supported yet by the
1026
# "Set" method, so we fail early here:
1027
if byte_arrays and signature != "ay":
1028
raise ValueError("Byte arrays not supported for non-'ay'"
1029
" signature {!r}".format(signature))
1030
1031
def decorator(func):
1032
func._dbus_is_property = True
1033
func._dbus_interface = dbus_interface
1034
func._dbus_signature = signature
1035
func._dbus_access = access
1036
func._dbus_name = func.__name__
1037
if func._dbus_name.endswith("_dbus_property"):
1038
func._dbus_name = func._dbus_name[:-14]
1039
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
1040
return func
1041
1042
return decorator
1043
1044
1045
def dbus_interface_annotations(dbus_interface):
1046
"""Decorator for marking functions returning interface annotations
1047
1048
Usage:
1049
1050
@dbus_interface_annotations("org.example.Interface")
1051
def _foo(self): # Function name does not matter
1052
return {"org.freedesktop.DBus.Deprecated": "true",
1053
"org.freedesktop.DBus.Property.EmitsChangedSignal":
1054
"false"}
1055
"""
1056
1057
def decorator(func):
1058
func._dbus_is_interface = True
1059
func._dbus_interface = dbus_interface
1060
func._dbus_name = dbus_interface
1061
return func
1062
1063
return decorator
1064
1065
1066
def dbus_annotations(annotations):
1067
"""Decorator to annotate D-Bus methods, signals or properties
1068
Usage:
1069
1070
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1071
"org.freedesktop.DBus.Property."
1072
"EmitsChangedSignal": "false"})
1073
@dbus_service_property("org.example.Interface", signature="b",
1074
access="r")
1075
def Property_dbus_property(self):
1076
return dbus.Boolean(False)
1077
1078
See also the DBusObjectWithAnnotations class.
1079
"""
1080
1081
def decorator(func):
1082
func._dbus_annotations = annotations
1083
return func
1084
1085
return decorator
1086
1087
1088
class DBusPropertyException(dbus.exceptions.DBusException):
1089
"""A base class for D-Bus property-related exceptions
1090
"""
1091
pass
1092
1093
1094
class DBusPropertyAccessException(DBusPropertyException):
1095
"""A property's access permissions disallows an operation.
1096
"""
1097
pass
1098
1099
1100
class DBusPropertyNotFound(DBusPropertyException):
1101
"""An attempt was made to access a non-existing property.
1102
"""
1103
pass
1104
1105
1106
class DBusObjectWithAnnotations(dbus.service.Object):
1107
"""A D-Bus object with annotations.
1108
1109
Classes inheriting from this can use the dbus_annotations
1110
decorator to add annotations to methods or signals.
1111
"""
1112
1113
@staticmethod
1114
def _is_dbus_thing(thing):
1115
"""Returns a function testing if an attribute is a D-Bus thing
1116
1117
If called like _is_dbus_thing("method") it returns a function
1118
suitable for use as predicate to inspect.getmembers().
1119
"""
1120
return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1121
False)
1122
1123
def _get_all_dbus_things(self, thing):
1124
"""Returns a generator of (name, attribute) pairs
1125
"""
1126
return ((getattr(athing.__get__(self), "_dbus_name", name),
1127
athing.__get__(self))
1128
for cls in self.__class__.__mro__
1129
for name, athing in
1130
inspect.getmembers(cls, self._is_dbus_thing(thing)))
1131
1132
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1133
out_signature = "s",
1134
path_keyword = 'object_path',
1135
connection_keyword = 'connection')
1136
def Introspect(self, object_path, connection):
1137
"""Overloading of standard D-Bus method.
1138
1139
Inserts annotation tags on methods and signals.
1140
"""
1141
xmlstring = dbus.service.Object.Introspect(self, object_path,
1142
connection)
1143
try:
1144
document = xml.dom.minidom.parseString(xmlstring)
1145
1146
for if_tag in document.getElementsByTagName("interface"):
1147
# Add annotation tags
1148
for typ in ("method", "signal"):
1149
for tag in if_tag.getElementsByTagName(typ):
1150
annots = dict()
1151
for name, prop in (self.
1152
_get_all_dbus_things(typ)):
1153
if (name == tag.getAttribute("name")
1154
and prop._dbus_interface
1155
== if_tag.getAttribute("name")):
1156
annots.update(getattr(
1157
prop, "_dbus_annotations", {}))
1158
for name, value in annots.items():
1159
ann_tag = document.createElement(
1160
"annotation")
1161
ann_tag.setAttribute("name", name)
1162
ann_tag.setAttribute("value", value)
1163
tag.appendChild(ann_tag)
1164
# Add interface annotation tags
1165
for annotation, value in dict(
1166
itertools.chain.from_iterable(
1167
annotations().items()
1168
for name, annotations
1169
in self._get_all_dbus_things("interface")
1170
if name == if_tag.getAttribute("name")
1171
)).items():
1172
ann_tag = document.createElement("annotation")
1173
ann_tag.setAttribute("name", annotation)
1174
ann_tag.setAttribute("value", value)
1175
if_tag.appendChild(ann_tag)
1176
# Fix argument name for the Introspect method itself
1177
if (if_tag.getAttribute("name")
1178
== dbus.INTROSPECTABLE_IFACE):
1179
for cn in if_tag.getElementsByTagName("method"):
1180
if cn.getAttribute("name") == "Introspect":
1181
for arg in cn.getElementsByTagName("arg"):
1182
if (arg.getAttribute("direction")
1183
== "out"):
1184
arg.setAttribute("name",
1185
"xml_data")
1186
xmlstring = document.toxml("utf-8")
1187
document.unlink()
1188
except (AttributeError, xml.dom.DOMException,
1189
xml.parsers.expat.ExpatError) as error:
1190
logger.error("Failed to override Introspection method",
1191
exc_info=error)
1192
return xmlstring
1193
1194
1195
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1196
"""A D-Bus object with properties.
1197
1198
Classes inheriting from this can use the dbus_service_property
1199
decorator to expose methods as D-Bus properties. It exposes the
1200
standard Get(), Set(), and GetAll() methods on the D-Bus.
1201
"""
1202
1203
def _get_dbus_property(self, interface_name, property_name):
1204
"""Returns a bound method if one exists which is a D-Bus
1205
property with the specified name and interface.
1206
"""
1207
for cls in self.__class__.__mro__:
1208
for name, value in inspect.getmembers(
1209
cls, self._is_dbus_thing("property")):
1210
if (value._dbus_name == property_name
1211
and value._dbus_interface == interface_name):
1212
return value.__get__(self)
1213
1214
# No such property
1215
raise DBusPropertyNotFound("{}:{}.{}".format(
1216
self.dbus_object_path, interface_name, property_name))
1217
1218
@classmethod
1219
def _get_all_interface_names(cls):
1220
"""Get a sequence of all interfaces supported by an object"""
1221
return (name for name in set(getattr(getattr(x, attr),
1222
"_dbus_interface", None)
1223
for x in (inspect.getmro(cls))
1224
for attr in dir(x))
1225
if name is not None)
1226
1227
@dbus.service.method(dbus.PROPERTIES_IFACE,
1228
in_signature="ss",
1229
out_signature="v")
1230
def Get(self, interface_name, property_name):
1231
"""Standard D-Bus property Get() method, see D-Bus standard.
1232
"""
1233
prop = self._get_dbus_property(interface_name, property_name)
1234
if prop._dbus_access == "write":
1235
raise DBusPropertyAccessException(property_name)
1236
value = prop()
1237
if not hasattr(value, "variant_level"):
1238
return value
1239
return type(value)(value, variant_level=value.variant_level+1)
1240
1241
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1242
def Set(self, interface_name, property_name, value):
1243
"""Standard D-Bus property Set() method, see D-Bus standard.
1244
"""
1245
prop = self._get_dbus_property(interface_name, property_name)
1246
if prop._dbus_access == "read":
1247
raise DBusPropertyAccessException(property_name)
1248
if prop._dbus_get_args_options["byte_arrays"]:
1249
# The byte_arrays option is not supported yet on
1250
# signatures other than "ay".
1251
if prop._dbus_signature != "ay":
1252
raise ValueError("Byte arrays not supported for non-"
1253
"'ay' signature {!r}"
1254
.format(prop._dbus_signature))
1255
value = dbus.ByteArray(b''.join(chr(byte)
1256
for byte in value))
1257
prop(value)
1258
1259
@dbus.service.method(dbus.PROPERTIES_IFACE,
1260
in_signature="s",
1261
out_signature="a{sv}")
1262
def GetAll(self, interface_name):
1263
"""Standard D-Bus property GetAll() method, see D-Bus
1264
standard.
1265
1266
Note: Will not include properties with access="write".
1267
"""
1268
properties = {}
1269
for name, prop in self._get_all_dbus_things("property"):
1270
if (interface_name
1271
and interface_name != prop._dbus_interface):
1272
# Interface non-empty but did not match
1273
continue
1274
# Ignore write-only properties
1275
if prop._dbus_access == "write":
1276
continue
1277
value = prop()
1278
if not hasattr(value, "variant_level"):
1279
properties[name] = value
1280
continue
1281
properties[name] = type(value)(
1282
value, variant_level = value.variant_level + 1)
1283
return dbus.Dictionary(properties, signature="sv")
1284
1285
@dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1286
def PropertiesChanged(self, interface_name, changed_properties,
1287
invalidated_properties):
1288
"""Standard D-Bus PropertiesChanged() signal, see D-Bus
1289
standard.
1290
"""
1291
pass
1292
1293
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1294
out_signature="s",
1295
path_keyword='object_path',
1296
connection_keyword='connection')
1297
def Introspect(self, object_path, connection):
1298
"""Overloading of standard D-Bus method.
1299
1300
Inserts property tags and interface annotation tags.
1301
"""
1302
xmlstring = DBusObjectWithAnnotations.Introspect(self,
1303
object_path,
1304
connection)
1305
try:
1306
document = xml.dom.minidom.parseString(xmlstring)
1307
1308
def make_tag(document, name, prop):
1309
e = document.createElement("property")
1310
e.setAttribute("name", name)
1311
e.setAttribute("type", prop._dbus_signature)
1312
e.setAttribute("access", prop._dbus_access)
1313
return e
1314
1315
for if_tag in document.getElementsByTagName("interface"):
1316
# Add property tags
1317
for tag in (make_tag(document, name, prop)
1318
for name, prop
1319
in self._get_all_dbus_things("property")
1320
if prop._dbus_interface
1321
== if_tag.getAttribute("name")):
1322
if_tag.appendChild(tag)
1323
# Add annotation tags for properties
1324
for tag in if_tag.getElementsByTagName("property"):
1325
annots = dict()
1326
for name, prop in self._get_all_dbus_things(
1327
"property"):
1328
if (name == tag.getAttribute("name")
1329
and prop._dbus_interface
1330
== if_tag.getAttribute("name")):
1331
annots.update(getattr(
1332
prop, "_dbus_annotations", {}))
1333
for name, value in annots.items():
1334
ann_tag = document.createElement(
1335
"annotation")
1336
ann_tag.setAttribute("name", name)
1337
ann_tag.setAttribute("value", value)
1338
tag.appendChild(ann_tag)
1339
# Add the names to the return values for the
1340
# "org.freedesktop.DBus.Properties" methods
1341
if (if_tag.getAttribute("name")
1342
== "org.freedesktop.DBus.Properties"):
1343
for cn in if_tag.getElementsByTagName("method"):
1344
if cn.getAttribute("name") == "Get":
1345
for arg in cn.getElementsByTagName("arg"):
1346
if (arg.getAttribute("direction")
1347
== "out"):
1348
arg.setAttribute("name", "value")
1349
elif cn.getAttribute("name") == "GetAll":
1350
for arg in cn.getElementsByTagName("arg"):
1351
if (arg.getAttribute("direction")
1352
== "out"):
1353
arg.setAttribute("name", "props")
1354
xmlstring = document.toxml("utf-8")
1355
document.unlink()
1356
except (AttributeError, xml.dom.DOMException,
1357
xml.parsers.expat.ExpatError) as error:
1358
logger.error("Failed to override Introspection method",
1359
exc_info=error)
1360
return xmlstring
1361
1362
try:
1363
dbus.OBJECT_MANAGER_IFACE
1364
except AttributeError:
1365
dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1366
1367
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1368
"""A D-Bus object with an ObjectManager.
1369
1370
Classes inheriting from this exposes the standard
1371
GetManagedObjects call and the InterfacesAdded and
1372
InterfacesRemoved signals on the standard
1373
"org.freedesktop.DBus.ObjectManager" interface.
1374
1375
Note: No signals are sent automatically; they must be sent
1376
manually.
1377
"""
1378
@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1379
out_signature = "a{oa{sa{sv}}}")
1380
def GetManagedObjects(self):
1381
"""This function must be overridden"""
1382
raise NotImplementedError()
1383
1384
@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1385
signature = "oa{sa{sv}}")
1386
def InterfacesAdded(self, object_path, interfaces_and_properties):
1387
pass
1388
1389
@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature = "oas")
1390
def InterfacesRemoved(self, object_path, interfaces):
1391
pass
1392
1393
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1394
out_signature = "s",
1395
path_keyword = 'object_path',
1396
connection_keyword = 'connection')
1397
def Introspect(self, object_path, connection):
1398
"""Overloading of standard D-Bus method.
1399
1400
Override return argument name of GetManagedObjects to be
1401
"objpath_interfaces_and_properties"
1402
"""
1403
xmlstring = DBusObjectWithAnnotations.Introspect(self,
1404
object_path,
1405
connection)
1406
try:
1407
document = xml.dom.minidom.parseString(xmlstring)
1408
1409
for if_tag in document.getElementsByTagName("interface"):
1410
# Fix argument name for the GetManagedObjects method
1411
if (if_tag.getAttribute("name")
1412
== dbus.OBJECT_MANAGER_IFACE):
1413
for cn in if_tag.getElementsByTagName("method"):
1414
if (cn.getAttribute("name")
1415
== "GetManagedObjects"):
1416
for arg in cn.getElementsByTagName("arg"):
1417
if (arg.getAttribute("direction")
1418
== "out"):
1419
arg.setAttribute(
1420
"name",
1421
"objpath_interfaces"
1422
"_and_properties")
1423
xmlstring = document.toxml("utf-8")
1424
document.unlink()
1425
except (AttributeError, xml.dom.DOMException,
1426
xml.parsers.expat.ExpatError) as error:
1427
logger.error("Failed to override Introspection method",
1428
exc_info = error)
1429
return xmlstring
1430
1431
def datetime_to_dbus(dt, variant_level=0):
1432
"""Convert a UTC datetime.datetime() to a D-Bus type."""
1433
if dt is None:
1434
return dbus.String("", variant_level = variant_level)
1435
return dbus.String(dt.isoformat(), variant_level=variant_level)
1436
1437
1438
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1439
"""A class decorator; applied to a subclass of
1440
dbus.service.Object, it will add alternate D-Bus attributes with
1441
interface names according to the "alt_interface_names" mapping.
1442
Usage:
1443
1444
@alternate_dbus_interfaces({"org.example.Interface":
1445
"net.example.AlternateInterface"})
1446
class SampleDBusObject(dbus.service.Object):
1447
@dbus.service.method("org.example.Interface")
1448
def SampleDBusMethod():
1449
pass
1450
1451
The above "SampleDBusMethod" on "SampleDBusObject" will be
1452
reachable via two interfaces: "org.example.Interface" and
1453
"net.example.AlternateInterface", the latter of which will have
1454
its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1455
"true", unless "deprecate" is passed with a False value.
1456
1457
This works for methods and signals, and also for D-Bus properties
1458
(from DBusObjectWithProperties) and interfaces (from the
1459
dbus_interface_annotations decorator).
1460
"""
1461
1462
def wrapper(cls):
1463
for orig_interface_name, alt_interface_name in (
1464
alt_interface_names.items()):
1465
attr = {}
1466
interface_names = set()
1467
# Go though all attributes of the class
1468
for attrname, attribute in inspect.getmembers(cls):
1469
# Ignore non-D-Bus attributes, and D-Bus attributes
1470
# with the wrong interface name
1471
if (not hasattr(attribute, "_dbus_interface")
1472
or not attribute._dbus_interface.startswith(
1473
orig_interface_name)):
1474
continue
1475
# Create an alternate D-Bus interface name based on
1476
# the current name
1477
alt_interface = attribute._dbus_interface.replace(
1478
orig_interface_name, alt_interface_name)
1479
interface_names.add(alt_interface)
1480
# Is this a D-Bus signal?
1481
if getattr(attribute, "_dbus_is_signal", False):
1482
if sys.version_info.major == 2:
1483
# Extract the original non-method undecorated
1484
# function by black magic
1485
nonmethod_func = (dict(
1486
zip(attribute.func_code.co_freevars,
1487
attribute.__closure__))
1488
["func"].cell_contents)
1489
else:
1490
nonmethod_func = attribute
1491
# Create a new, but exactly alike, function
1492
# object, and decorate it to be a new D-Bus signal
1493
# with the alternate D-Bus interface name
1494
if sys.version_info.major == 2:
1495
new_function = types.FunctionType(
1496
nonmethod_func.func_code,
1497
nonmethod_func.func_globals,
1498
nonmethod_func.func_name,
1499
nonmethod_func.func_defaults,
1500
nonmethod_func.func_closure)
1501
else:
1502
new_function = types.FunctionType(
1503
nonmethod_func.__code__,
1504
nonmethod_func.__globals__,
1505
nonmethod_func.__name__,
1506
nonmethod_func.__defaults__,
1507
nonmethod_func.__closure__)
1508
new_function = (dbus.service.signal(
1509
alt_interface,
1510
attribute._dbus_signature)(new_function))
1511
# Copy annotations, if any
1512
try:
1513
new_function._dbus_annotations = dict(
1514
attribute._dbus_annotations)
1515
except AttributeError:
1516
pass
1517
# Define a creator of a function to call both the
1518
# original and alternate functions, so both the
1519
# original and alternate signals gets sent when
1520
# the function is called
1521
def fixscope(func1, func2):
1522
"""This function is a scope container to pass
1523
func1 and func2 to the "call_both" function
1524
outside of its arguments"""
1525
1526
@functools.wraps(func2)
1527
def call_both(*args, **kwargs):
1528
"""This function will emit two D-Bus
1529
signals by calling func1 and func2"""
1530
func1(*args, **kwargs)
1531
func2(*args, **kwargs)
1532
# Make wrapper function look like a D-Bus signal
1533
for name, attr in inspect.getmembers(func2):
1534
if name.startswith("_dbus_"):
1535
setattr(call_both, name, attr)
1536
1537
return call_both
1538
# Create the "call_both" function and add it to
1539
# the class
1540
attr[attrname] = fixscope(attribute, new_function)
1541
# Is this a D-Bus method?
1542
elif getattr(attribute, "_dbus_is_method", False):
1543
# Create a new, but exactly alike, function
1544
# object. Decorate it to be a new D-Bus method
1545
# with the alternate D-Bus interface name. Add it
1546
# to the class.
1547
attr[attrname] = (
1548
dbus.service.method(
1549
alt_interface,
1550
attribute._dbus_in_signature,
1551
attribute._dbus_out_signature)
1552
(types.FunctionType(attribute.func_code,
1553
attribute.func_globals,
1554
attribute.func_name,
1555
attribute.func_defaults,
1556
attribute.func_closure)))
1557
# Copy annotations, if any
1558
try:
1559
attr[attrname]._dbus_annotations = dict(
1560
attribute._dbus_annotations)
1561
except AttributeError:
1562
pass
1563
# Is this a D-Bus property?
1564
elif getattr(attribute, "_dbus_is_property", False):
1565
# Create a new, but exactly alike, function
1566
# object, and decorate it to be a new D-Bus
1567
# property with the alternate D-Bus interface
1568
# name. Add it to the class.
1569
attr[attrname] = (dbus_service_property(
1570
alt_interface, attribute._dbus_signature,
1571
attribute._dbus_access,
1572
attribute._dbus_get_args_options
1573
["byte_arrays"])
1574
(types.FunctionType(
1575
attribute.func_code,
1576
attribute.func_globals,
1577
attribute.func_name,
1578
attribute.func_defaults,
1579
attribute.func_closure)))
1580
# Copy annotations, if any
1581
try:
1582
attr[attrname]._dbus_annotations = dict(
1583
attribute._dbus_annotations)
1584
except AttributeError:
1585
pass
1586
# Is this a D-Bus interface?
1587
elif getattr(attribute, "_dbus_is_interface", False):
1588
# Create a new, but exactly alike, function
1589
# object. Decorate it to be a new D-Bus interface
1590
# with the alternate D-Bus interface name. Add it
1591
# to the class.
1592
attr[attrname] = (
1593
dbus_interface_annotations(alt_interface)
1594
(types.FunctionType(attribute.func_code,
1595
attribute.func_globals,
1596
attribute.func_name,
1597
attribute.func_defaults,
1598
attribute.func_closure)))
1599
if deprecate:
1600
# Deprecate all alternate interfaces
1601
iname="_AlternateDBusNames_interface_annotation{}"
1602
for interface_name in interface_names:
1603
1604
@dbus_interface_annotations(interface_name)
1605
def func(self):
1606
return { "org.freedesktop.DBus.Deprecated":
1607
"true" }
1608
# Find an unused name
1609
for aname in (iname.format(i)
1610
for i in itertools.count()):
1611
if aname not in attr:
1612
attr[aname] = func
1613
break
1614
if interface_names:
1615
# Replace the class with a new subclass of it with
1616
# methods, signals, etc. as created above.
1617
cls = type(b"{}Alternate".format(cls.__name__),
1618
(cls, ), attr)
1619
return cls
1620
1621
return wrapper
1622
1623
1624
@alternate_dbus_interfaces({"se.recompile.Mandos":
1625
"se.bsnet.fukt.Mandos"})
1626
class ClientDBus(Client, DBusObjectWithProperties):
1627
"""A Client class using D-Bus
1628
1629
Attributes:
1630
dbus_object_path: dbus.ObjectPath
1631
bus: dbus.SystemBus()
1632
"""
1633
1634
runtime_expansions = (Client.runtime_expansions
1635
+ ("dbus_object_path", ))
1636
1637
_interface = "se.recompile.Mandos.Client"
1638
1639
# dbus.service.Object doesn't use super(), so we can't either.
1640
1641
def __init__(self, bus = None, *args, **kwargs):
1642
self.bus = bus
1643
Client.__init__(self, *args, **kwargs)
1644
# Only now, when this client is initialized, can it show up on
1645
# the D-Bus
1646
client_object_name = str(self.name).translate(
1647
{ord("."): ord("_"),
1648
ord("-"): ord("_")})
1649
self.dbus_object_path = dbus.ObjectPath(
1650
"/clients/" + client_object_name)
1651
DBusObjectWithProperties.__init__(self, self.bus,
1652
self.dbus_object_path)
1653
1654
def notifychangeproperty(transform_func, dbus_name,
1655
type_func=lambda x: x,
1656
variant_level=1,
1657
invalidate_only=False,
1658
_interface=_interface):
1659
""" Modify a variable so that it's a property which announces
1660
its changes to DBus.
1661
1662
transform_fun: Function that takes a value and a variant_level
1663
and transforms it to a D-Bus type.
1664
dbus_name: D-Bus name of the variable
1665
type_func: Function that transform the value before sending it
1666
to the D-Bus. Default: no transform
1667
variant_level: D-Bus variant level. Default: 1
1668
"""
1669
attrname = "_{}".format(dbus_name)
1670
1671
def setter(self, value):
1672
if hasattr(self, "dbus_object_path"):
1673
if (not hasattr(self, attrname) or
1674
type_func(getattr(self, attrname, None))
1675
!= type_func(value)):
1676
if invalidate_only:
1677
self.PropertiesChanged(
1678
_interface, dbus.Dictionary(),
1679
dbus.Array((dbus_name, )))
1680
else:
1681
dbus_value = transform_func(
1682
type_func(value),
1683
variant_level = variant_level)
1684
self.PropertyChanged(dbus.String(dbus_name),
1685
dbus_value)
1686
self.PropertiesChanged(
1687
_interface,
1688
dbus.Dictionary({ dbus.String(dbus_name):
1689
dbus_value }),
1690
dbus.Array())
1691
setattr(self, attrname, value)
1692
1693
return property(lambda self: getattr(self, attrname), setter)
1694
1695
expires = notifychangeproperty(datetime_to_dbus, "Expires")
1696
approvals_pending = notifychangeproperty(dbus.Boolean,
1697
"ApprovalPending",
1698
type_func = bool)
1699
enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1700
last_enabled = notifychangeproperty(datetime_to_dbus,
1701
"LastEnabled")
1702
checker = notifychangeproperty(
1703
dbus.Boolean, "CheckerRunning",
1704
type_func = lambda checker: checker is not None)
1705
last_checked_ok = notifychangeproperty(datetime_to_dbus,
1706
"LastCheckedOK")
1707
last_checker_status = notifychangeproperty(dbus.Int16,
1708
"LastCheckerStatus")
1709
last_approval_request = notifychangeproperty(
1710
datetime_to_dbus, "LastApprovalRequest")
1711
approved_by_default = notifychangeproperty(dbus.Boolean,
1712
"ApprovedByDefault")
1713
approval_delay = notifychangeproperty(
1714
dbus.UInt64, "ApprovalDelay",
1715
type_func = lambda td: td.total_seconds() * 1000)
1716
approval_duration = notifychangeproperty(
1717
dbus.UInt64, "ApprovalDuration",
1718
type_func = lambda td: td.total_seconds() * 1000)
1719
host = notifychangeproperty(dbus.String, "Host")
1720
timeout = notifychangeproperty(
1721
dbus.UInt64, "Timeout",
1722
type_func = lambda td: td.total_seconds() * 1000)
1723
extended_timeout = notifychangeproperty(
1724
dbus.UInt64, "ExtendedTimeout",
1725
type_func = lambda td: td.total_seconds() * 1000)
1726
interval = notifychangeproperty(
1727
dbus.UInt64, "Interval",
1728
type_func = lambda td: td.total_seconds() * 1000)
1729
checker_command = notifychangeproperty(dbus.String, "Checker")
1730
secret = notifychangeproperty(dbus.ByteArray, "Secret",
1731
invalidate_only=True)
1732
1733
del notifychangeproperty
1734
1735
def __del__(self, *args, **kwargs):
1736
try:
1737
self.remove_from_connection()
1738
except LookupError:
1739
pass
1740
if hasattr(DBusObjectWithProperties, "__del__"):
1741
DBusObjectWithProperties.__del__(self, *args, **kwargs)
1742
Client.__del__(self, *args, **kwargs)
1743
1744
def checker_callback(self, source, condition,
1745
connection, command, *args, **kwargs):
1746
ret = Client.checker_callback(self, source, condition,
1747
connection, command, *args,
1748
**kwargs)
1749
exitstatus = self.last_checker_status
1750
if exitstatus >= 0:
1751
# Emit D-Bus signal
1752
self.CheckerCompleted(dbus.Int16(exitstatus),
1753
# This is specific to GNU libC
1754
dbus.Int64(exitstatus << 8),
1755
dbus.String(command))
1756
else:
1757
# Emit D-Bus signal
1758
self.CheckerCompleted(dbus.Int16(-1),
1759
dbus.Int64(
1760
# This is specific to GNU libC
1761
(exitstatus << 8)
1762
| self.last_checker_signal),
1763
dbus.String(command))
1764
return ret
1765
1766
def start_checker(self, *args, **kwargs):
1767
old_checker_pid = getattr(self.checker, "pid", None)
1768
r = Client.start_checker(self, *args, **kwargs)
1769
# Only if new checker process was started
1770
if (self.checker is not None
1771
and old_checker_pid != self.checker.pid):
1772
# Emit D-Bus signal
1773
self.CheckerStarted(self.current_checker_command)
1774
return r
1775
1776
def _reset_approved(self):
1777
self.approved = None
1778
return False
1779
1780
def approve(self, value=True):
1781
self.approved = value
1782
gobject.timeout_add(int(self.approval_duration.total_seconds()
1783
* 1000), self._reset_approved)
1784
self.send_changedstate()
1785
1786
## D-Bus methods, signals & properties
1787
1788
## Interfaces
1789
1790
## Signals
1791
1792
# CheckerCompleted - signal
1793
@dbus.service.signal(_interface, signature="nxs")
1794
def CheckerCompleted(self, exitcode, waitstatus, command):
1795
"D-Bus signal"
1796
pass
1797
1798
# CheckerStarted - signal
1799
@dbus.service.signal(_interface, signature="s")
1800
def CheckerStarted(self, command):
1801
"D-Bus signal"
1802
pass
1803
1804
# PropertyChanged - signal
1805
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1806
@dbus.service.signal(_interface, signature="sv")
1807
def PropertyChanged(self, property, value):
1808
"D-Bus signal"
1809
pass
1810
1811
# GotSecret - signal
1812
@dbus.service.signal(_interface)
1813
def GotSecret(self):
1814
"""D-Bus signal
1815
Is sent after a successful transfer of secret from the Mandos
1816
server to mandos-client
1817
"""
1818
pass
1819
1820
# Rejected - signal
1821
@dbus.service.signal(_interface, signature="s")
1822
def Rejected(self, reason):
1823
"D-Bus signal"
1824
pass
1825
1826
# NeedApproval - signal
1827
@dbus.service.signal(_interface, signature="tb")
1828
def NeedApproval(self, timeout, default):
1829
"D-Bus signal"
1830
return self.need_approval()
1831
1832
## Methods
1833
1834
# Approve - method
1835
@dbus.service.method(_interface, in_signature="b")
1836
def Approve(self, value):
1837
self.approve(value)
1838
1839
# CheckedOK - method
1840
@dbus.service.method(_interface)
1841
def CheckedOK(self):
1842
self.checked_ok()
1843
1844
# Enable - method
1845
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1846
@dbus.service.method(_interface)
1847
def Enable(self):
1848
"D-Bus method"
1849
self.enable()
1850
1851
# StartChecker - method
1852
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1853
@dbus.service.method(_interface)
1854
def StartChecker(self):
1855
"D-Bus method"
1856
self.start_checker()
1857
1858
# Disable - method
1859
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1860
@dbus.service.method(_interface)
1861
def Disable(self):
1862
"D-Bus method"
1863
self.disable()
1864
1865
# StopChecker - method
1866
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1867
@dbus.service.method(_interface)
1868
def StopChecker(self):
1869
self.stop_checker()
1870
1871
## Properties
1872
1873
# ApprovalPending - property
1874
@dbus_service_property(_interface, signature="b", access="read")
1875
def ApprovalPending_dbus_property(self):
1876
return dbus.Boolean(bool(self.approvals_pending))
1877
1878
# ApprovedByDefault - property
1879
@dbus_service_property(_interface,
1880
signature="b",
1881
access="readwrite")
1882
def ApprovedByDefault_dbus_property(self, value=None):
1883
if value is None: # get
1884
return dbus.Boolean(self.approved_by_default)
1885
self.approved_by_default = bool(value)
1886
1887
# ApprovalDelay - property
1888
@dbus_service_property(_interface,
1889
signature="t",
1890
access="readwrite")
1891
def ApprovalDelay_dbus_property(self, value=None):
1892
if value is None: # get
1893
return dbus.UInt64(self.approval_delay.total_seconds()
1894
* 1000)
1895
self.approval_delay = datetime.timedelta(0, 0, 0, value)
1896
1897
# ApprovalDuration - property
1898
@dbus_service_property(_interface,
1899
signature="t",
1900
access="readwrite")
1901
def ApprovalDuration_dbus_property(self, value=None):
1902
if value is None: # get
1903
return dbus.UInt64(self.approval_duration.total_seconds()
1904
* 1000)
1905
self.approval_duration = datetime.timedelta(0, 0, 0, value)
1906
1907
# Name - property
1908
@dbus_annotations(
1909
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
1910
@dbus_service_property(_interface, signature="s", access="read")
1911
def Name_dbus_property(self):
1912
return dbus.String(self.name)
1913
1914
# Fingerprint - property
1915
@dbus_annotations(
1916
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
1917
@dbus_service_property(_interface, signature="s", access="read")
1918
def Fingerprint_dbus_property(self):
1919
return dbus.String(self.fingerprint)
1920
1921
# Host - property
1922
@dbus_service_property(_interface,
1923
signature="s",
1924
access="readwrite")
1925
def Host_dbus_property(self, value=None):
1926
if value is None: # get
1927
return dbus.String(self.host)
1928
self.host = str(value)
1929
1930
# Created - property
1931
@dbus_annotations(
1932
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
1933
@dbus_service_property(_interface, signature="s", access="read")
1934
def Created_dbus_property(self):
1935
return datetime_to_dbus(self.created)
1936
1937
# LastEnabled - property
1938
@dbus_service_property(_interface, signature="s", access="read")
1939
def LastEnabled_dbus_property(self):
1940
return datetime_to_dbus(self.last_enabled)
1941
1942
# Enabled - property
1943
@dbus_service_property(_interface,
1944
signature="b",
1945
access="readwrite")
1946
def Enabled_dbus_property(self, value=None):
1947
if value is None: # get
1948
return dbus.Boolean(self.enabled)
1949
if value:
1950
self.enable()
1951
else:
1952
self.disable()
1953
1954
# LastCheckedOK - property
1955
@dbus_service_property(_interface,
1956
signature="s",
1957
access="readwrite")
1958
def LastCheckedOK_dbus_property(self, value=None):
1959
if value is not None:
1960
self.checked_ok()
1961
return
1962
return datetime_to_dbus(self.last_checked_ok)
1963
1964
# LastCheckerStatus - property
1965
@dbus_service_property(_interface, signature="n", access="read")
1966
def LastCheckerStatus_dbus_property(self):
1967
return dbus.Int16(self.last_checker_status)
1968
1969
# Expires - property
1970
@dbus_service_property(_interface, signature="s", access="read")
1971
def Expires_dbus_property(self):
1972
return datetime_to_dbus(self.expires)
1973
1974
# LastApprovalRequest - property
1975
@dbus_service_property(_interface, signature="s", access="read")
1976
def LastApprovalRequest_dbus_property(self):
1977
return datetime_to_dbus(self.last_approval_request)
1978
1979
# Timeout - property
1980
@dbus_service_property(_interface,
1981
signature="t",
1982
access="readwrite")
1983
def Timeout_dbus_property(self, value=None):
1984
if value is None: # get
1985
return dbus.UInt64(self.timeout.total_seconds() * 1000)
1986
old_timeout = self.timeout
1987
self.timeout = datetime.timedelta(0, 0, 0, value)
1988
# Reschedule disabling
1989
if self.enabled:
1990
now = datetime.datetime.utcnow()
1991
self.expires += self.timeout - old_timeout
1992
if self.expires <= now:
1993
# The timeout has passed
1994
self.disable()
1995
else:
1996
if (getattr(self, "disable_initiator_tag", None)
1997
is None):
1998
return
1999
gobject.source_remove(self.disable_initiator_tag)
2000
self.disable_initiator_tag = gobject.timeout_add(
2001
int((self.expires - now).total_seconds() * 1000),
2002
self.disable)
2003
2004
# ExtendedTimeout - property
2005
@dbus_service_property(_interface,
2006
signature="t",
2007
access="readwrite")
2008
def ExtendedTimeout_dbus_property(self, value=None):
2009
if value is None: # get
2010
return dbus.UInt64(self.extended_timeout.total_seconds()
2011
* 1000)
2012
self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2013
2014
# Interval - property
2015
@dbus_service_property(_interface,
2016
signature="t",
2017
access="readwrite")
2018
def Interval_dbus_property(self, value=None):
2019
if value is None: # get
2020
return dbus.UInt64(self.interval.total_seconds() * 1000)
2021
self.interval = datetime.timedelta(0, 0, 0, value)
2022
if getattr(self, "checker_initiator_tag", None) is None:
2023
return
2024
if self.enabled:
2025
# Reschedule checker run
2026
gobject.source_remove(self.checker_initiator_tag)
2027
self.checker_initiator_tag = gobject.timeout_add(
2028
value, self.start_checker)
2029
self.start_checker() # Start one now, too
2030
2031
# Checker - property
2032
@dbus_service_property(_interface,
2033
signature="s",
2034
access="readwrite")
2035
def Checker_dbus_property(self, value=None):
2036
if value is None: # get
2037
return dbus.String(self.checker_command)
2038
self.checker_command = str(value)
2039
2040
# CheckerRunning - property
2041
@dbus_service_property(_interface,
2042
signature="b",
2043
access="readwrite")
2044
def CheckerRunning_dbus_property(self, value=None):
2045
if value is None: # get
2046
return dbus.Boolean(self.checker is not None)
2047
if value:
2048
self.start_checker()
2049
else:
2050
self.stop_checker()
2051
2052
# ObjectPath - property
2053
@dbus_annotations(
2054
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2055
"org.freedesktop.DBus.Deprecated": "true"})
2056
@dbus_service_property(_interface, signature="o", access="read")
2057
def ObjectPath_dbus_property(self):
2058
return self.dbus_object_path # is already a dbus.ObjectPath
2059
2060
# Secret = property
2061
@dbus_annotations(
2062
{"org.freedesktop.DBus.Property.EmitsChangedSignal":
2063
"invalidates"})
2064
@dbus_service_property(_interface,
2065
signature="ay",
2066
access="write",
2067
byte_arrays=True)
2068
def Secret_dbus_property(self, value):
2069
self.secret = bytes(value)
2070
2071
del _interface
2072
2073
2074
class ProxyClient(object):
2075
def __init__(self, child_pipe, fpr, address):
2076
self._pipe = child_pipe
2077
self._pipe.send(('init', fpr, address))
2078
if not self._pipe.recv():
2079
raise KeyError(fpr)
2080
2081
def __getattribute__(self, name):
2082
if name == '_pipe':
2083
return super(ProxyClient, self).__getattribute__(name)
2084
self._pipe.send(('getattr', name))
2085
data = self._pipe.recv()
2086
if data[0] == 'data':
2087
return data[1]
2088
if data[0] == 'function':
2089
2090
def func(*args, **kwargs):
2091
self._pipe.send(('funcall', name, args, kwargs))
2092
return self._pipe.recv()[1]
2093
2094
return func
2095
2096
def __setattr__(self, name, value):
2097
if name == '_pipe':
2098
return super(ProxyClient, self).__setattr__(name, value)
2099
self._pipe.send(('setattr', name, value))
2100
2101
2102
class ClientHandler(socketserver.BaseRequestHandler, object):
2103
"""A class to handle client connections.
2104
2105
Instantiated once for each connection to handle it.
441
2106
Note: This will run in its own forked process."""
442
2107
443
2108
def handle(self):
444
logger.info(u"TCP connection from: %s",
445
unicode(self.client_address))
446
session = gnutls.connection.ClientSession\
447
(self.request, gnutls.connection.X509Credentials())
448
449
line = self.request.makefile().readline()
450
logger.debug(u"Protocol version: %r", line)
451
try:
452
if int(line.strip().split()[0]) > 1:
453
raise RuntimeError
454
except (ValueError, IndexError, RuntimeError), error:
455
logger.error(u"Unknown protocol version: %s", error)
456
return
457
458
# Note: gnutls.connection.X509Credentials is really a generic
459
# GnuTLS certificate credentials object so long as no X.509
460
# keys are added to it. Therefore, we can use it here despite
461
# using OpenPGP certificates.
462
463
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
464
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
465
# "+DHE-DSS"))
466
priority = "NORMAL" # Fallback default, since this
467
# MUST be set.
468
if self.server.settings["priority"]:
469
priority = self.server.settings["priority"]
470
gnutls.library.functions.gnutls_priority_set_direct\
471
(session._c_object, priority, None);
472
473
try:
474
session.handshake()
475
except gnutls.errors.GNUTLSError, error:
476
logger.warning(u"Handshake failed: %s", error)
477
# Do not run session.bye() here: the session is not
478
# established. Just abandon the request.
479
return
480
try:
481
fpr = fingerprint(peer_certificate(session))
482
except (TypeError, gnutls.errors.GNUTLSError), error:
483
logger.warning(u"Bad certificate: %s", error)
484
session.bye()
485
return
486
logger.debug(u"Fingerprint: %s", fpr)
487
client = None
488
for c in self.server.clients:
489
if c.fingerprint == fpr:
490
client = c
491
break
492
if not client:
493
logger.warning(u"Client not found for fingerprint: %s",
494
fpr)
495
session.bye()
496
return
497
# Have to check if client.still_valid(), since it is possible
498
# that the client timed out while establishing the GnuTLS
499
# session.
500
if not client.still_valid():
501
logger.warning(u"Client %(name)s is invalid",
502
vars(client))
503
session.bye()
504
return
505
sent_size = 0
506
while sent_size < len(client.secret):
507
sent = session.send(client.secret[sent_size:])
508
logger.debug(u"Sent: %d, remaining: %d",
509
sent, len(client.secret)
510
- (sent_size + sent))
511
sent_size += sent
512
session.bye()
513
514
515
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
516
"""IPv6 TCP server. Accepts 'None' as address and/or port.
2109
with contextlib.closing(self.server.child_pipe) as child_pipe:
2110
logger.info("TCP connection from: %s",
2111
str(self.client_address))
2112
logger.debug("Pipe FD: %d",
2113
self.server.child_pipe.fileno())
2114
2115
session = gnutls.ClientSession(self.request)
2116
2117
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
2118
# "+AES-256-CBC", "+SHA1",
2119
# "+COMP-NULL", "+CTYPE-OPENPGP",
2120
# "+DHE-DSS"))
2121
# Use a fallback default, since this MUST be set.
2122
priority = self.server.gnutls_priority
2123
if priority is None:
2124
priority = "NORMAL"
2125
gnutls.priority_set_direct(session._c_object, priority,
2126
None)
2127
2128
# Start communication using the Mandos protocol
2129
# Get protocol number
2130
line = self.request.makefile().readline()
2131
logger.debug("Protocol version: %r", line)
2132
try:
2133
if int(line.strip().split()[0]) > 1:
2134
raise RuntimeError(line)
2135
except (ValueError, IndexError, RuntimeError) as error:
2136
logger.error("Unknown protocol version: %s", error)
2137
return
2138
2139
# Start GnuTLS connection
2140
try:
2141
session.handshake()
2142
except gnutls.Error as error:
2143
logger.warning("Handshake failed: %s", error)
2144
# Do not run session.bye() here: the session is not
2145
# established. Just abandon the request.
2146
return
2147
logger.debug("Handshake succeeded")
2148
2149
approval_required = False
2150
try:
2151
try:
2152
fpr = self.fingerprint(
2153
self.peer_certificate(session))
2154
except (TypeError, gnutls.Error) as error:
2155
logger.warning("Bad certificate: %s", error)
2156
return
2157
logger.debug("Fingerprint: %s", fpr)
2158
2159
try:
2160
client = ProxyClient(child_pipe, fpr,
2161
self.client_address)
2162
except KeyError:
2163
return
2164
2165
if client.approval_delay:
2166
delay = client.approval_delay
2167
client.approvals_pending += 1
2168
approval_required = True
2169
2170
while True:
2171
if not client.enabled:
2172
logger.info("Client %s is disabled",
2173
client.name)
2174
if self.server.use_dbus:
2175
# Emit D-Bus signal
2176
client.Rejected("Disabled")
2177
return
2178
2179
if client.approved or not client.approval_delay:
2180
#We are approved or approval is disabled
2181
break
2182
elif client.approved is None:
2183
logger.info("Client %s needs approval",
2184
client.name)
2185
if self.server.use_dbus:
2186
# Emit D-Bus signal
2187
client.NeedApproval(
2188
client.approval_delay.total_seconds()
2189
* 1000, client.approved_by_default)
2190
else:
2191
logger.warning("Client %s was not approved",
2192
client.name)
2193
if self.server.use_dbus:
2194
# Emit D-Bus signal
2195
client.Rejected("Denied")
2196
return
2197
2198
#wait until timeout or approved
2199
time = datetime.datetime.now()
2200
client.changedstate.acquire()
2201
client.changedstate.wait(delay.total_seconds())
2202
client.changedstate.release()
2203
time2 = datetime.datetime.now()
2204
if (time2 - time) >= delay:
2205
if not client.approved_by_default:
2206
logger.warning("Client %s timed out while"
2207
" waiting for approval",
2208
client.name)
2209
if self.server.use_dbus:
2210
# Emit D-Bus signal
2211
client.Rejected("Approval timed out")
2212
return
2213
else:
2214
break
2215
else:
2216
delay -= time2 - time
2217
2218
sent_size = 0
2219
while sent_size < len(client.secret):
2220
try:
2221
sent = session.send(client.secret[sent_size:])
2222
except gnutls.Error as error:
2223
logger.warning("gnutls send failed",
2224
exc_info=error)
2225
return
2226
logger.debug("Sent: %d, remaining: %d", sent,
2227
len(client.secret) - (sent_size
2228
+ sent))
2229
sent_size += sent
2230
2231
logger.info("Sending secret to %s", client.name)
2232
# bump the timeout using extended_timeout
2233
client.bump_timeout(client.extended_timeout)
2234
if self.server.use_dbus:
2235
# Emit D-Bus signal
2236
client.GotSecret()
2237
2238
finally:
2239
if approval_required:
2240
client.approvals_pending -= 1
2241
try:
2242
session.bye()
2243
except gnutls.Error as error:
2244
logger.warning("GnuTLS bye failed",
2245
exc_info=error)
2246
2247
@staticmethod
2248
def peer_certificate(session):
2249
"Return the peer's OpenPGP certificate as a bytestring"
2250
# If not an OpenPGP certificate...
2251
if (gnutls.certificate_type_get(session._c_object)
2252
!= gnutls.CRT_OPENPGP):
2253
# ...return invalid data
2254
return b""
2255
list_size = ctypes.c_uint(1)
2256
cert_list = (gnutls.certificate_get_peers
2257
(session._c_object, ctypes.byref(list_size)))
2258
if not bool(cert_list) and list_size.value != 0:
2259
raise gnutls.Error("error getting peer certificate")
2260
if list_size.value == 0:
2261
return None
2262
cert = cert_list[0]
2263
return ctypes.string_at(cert.data, cert.size)
2264
2265
@staticmethod
2266
def fingerprint(openpgp):
2267
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
2268
# New GnuTLS "datum" with the OpenPGP public key
2269
datum = gnutls.datum_t(
2270
ctypes.cast(ctypes.c_char_p(openpgp),
2271
ctypes.POINTER(ctypes.c_ubyte)),
2272
ctypes.c_uint(len(openpgp)))
2273
# New empty GnuTLS certificate
2274
crt = gnutls.openpgp_crt_t()
2275
gnutls.openpgp_crt_init(ctypes.byref(crt))
2276
# Import the OpenPGP public key into the certificate
2277
gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2278
gnutls.OPENPGP_FMT_RAW)
2279
# Verify the self signature in the key
2280
crtverify = ctypes.c_uint()
2281
gnutls.openpgp_crt_verify_self(crt, 0,
2282
ctypes.byref(crtverify))
2283
if crtverify.value != 0:
2284
gnutls.openpgp_crt_deinit(crt)
2285
raise gnutls.CertificateSecurityError("Verify failed")
2286
# New buffer for the fingerprint
2287
buf = ctypes.create_string_buffer(20)
2288
buf_len = ctypes.c_size_t()
2289
# Get the fingerprint from the certificate into the buffer
2290
gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2291
ctypes.byref(buf_len))
2292
# Deinit the certificate
2293
gnutls.openpgp_crt_deinit(crt)
2294
# Convert the buffer to a Python bytestring
2295
fpr = ctypes.string_at(buf, buf_len.value)
2296
# Convert the bytestring to hexadecimal notation
2297
hex_fpr = binascii.hexlify(fpr).upper()
2298
return hex_fpr
2299
2300
2301
class MultiprocessingMixIn(object):
2302
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
2303
2304
def sub_process_main(self, request, address):
2305
try:
2306
self.finish_request(request, address)
2307
except Exception:
2308
self.handle_error(request, address)
2309
self.close_request(request)
2310
2311
def process_request(self, request, address):
2312
"""Start a new process to process the request."""
2313
proc = multiprocessing.Process(target = self.sub_process_main,
2314
args = (request, address))
2315
proc.start()
2316
return proc
2317
2318
2319
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
2320
""" adds a pipe to the MixIn """
2321
2322
def process_request(self, request, client_address):
2323
"""Overrides and wraps the original process_request().
2324
2325
This function creates a new pipe in self.pipe
2326
"""
2327
parent_pipe, self.child_pipe = multiprocessing.Pipe()
2328
2329
proc = MultiprocessingMixIn.process_request(self, request,
2330
client_address)
2331
self.child_pipe.close()
2332
self.add_pipe(parent_pipe, proc)
2333
2334
def add_pipe(self, parent_pipe, proc):
2335
"""Dummy function; override as necessary"""
2336
raise NotImplementedError()
2337
2338
2339
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2340
socketserver.TCPServer, object):
2341
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
2342
517
2343
Attributes:
518
settings: Server settings
519
clients: Set() of Client objects
2344
enabled: Boolean; whether this server is activated yet
2345
interface: None or a network interface name (string)
2346
use_ipv6: Boolean; to use IPv6 or not
520
2347
"""
521
address_family = socket.AF_INET6
522
def __init__(self, *args, **kwargs):
523
if "settings" in kwargs:
524
self.settings = kwargs["settings"]
525
del kwargs["settings"]
526
if "clients" in kwargs:
527
self.clients = kwargs["clients"]
528
del kwargs["clients"]
529
return super(type(self), self).__init__(*args, **kwargs)
2348
2349
def __init__(self, server_address, RequestHandlerClass,
2350
interface=None,
2351
use_ipv6=True,
2352
socketfd=None):
2353
"""If socketfd is set, use that file descriptor instead of
2354
creating a new one with socket.socket().
2355
"""
2356
self.interface = interface
2357
if use_ipv6:
2358
self.address_family = socket.AF_INET6
2359
if socketfd is not None:
2360
# Save the file descriptor
2361
self.socketfd = socketfd
2362
# Save the original socket.socket() function
2363
self.socket_socket = socket.socket
2364
# To implement --socket, we monkey patch socket.socket.
2365
#
2366
# (When socketserver.TCPServer is a new-style class, we
2367
# could make self.socket into a property instead of monkey
2368
# patching socket.socket.)
2369
#
2370
# Create a one-time-only replacement for socket.socket()
2371
@functools.wraps(socket.socket)
2372
def socket_wrapper(*args, **kwargs):
2373
# Restore original function so subsequent calls are
2374
# not affected.
2375
socket.socket = self.socket_socket
2376
del self.socket_socket
2377
# This time only, return a new socket object from the
2378
# saved file descriptor.
2379
return socket.fromfd(self.socketfd, *args, **kwargs)
2380
# Replace socket.socket() function with wrapper
2381
socket.socket = socket_wrapper
2382
# The socketserver.TCPServer.__init__ will call
2383
# socket.socket(), which might be our replacement,
2384
# socket_wrapper(), if socketfd was set.
2385
socketserver.TCPServer.__init__(self, server_address,
2386
RequestHandlerClass)
2387
530
2388
def server_bind(self):
531
2389
"""This overrides the normal server_bind() function
532
2390
to bind to an interface if one was specified, and also NOT to
533
2391
bind to an address or port if they were not specified."""
534
if self.settings["interface"]:
535
# 25 is from /usr/include/asm-i486/socket.h
536
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
537
try:
538
self.socket.setsockopt(socket.SOL_SOCKET,
539
SO_BINDTODEVICE,
540
self.settings["interface"])
541
except socket.error, error:
542
if error[0] == errno.EPERM:
543
logger.error(u"No permission to"
544
u" bind to interface %s",
545
self.settings["interface"])
546
else:
547
raise error
2392
if self.interface is not None:
2393
if SO_BINDTODEVICE is None:
2394
logger.error("SO_BINDTODEVICE does not exist;"
2395
" cannot bind to interface %s",
2396
self.interface)
2397
else:
2398
try:
2399
self.socket.setsockopt(
2400
socket.SOL_SOCKET, SO_BINDTODEVICE,
2401
(self.interface + "\0").encode("utf-8"))
2402
except socket.error as error:
2403
if error.errno == errno.EPERM:
2404
logger.error("No permission to bind to"
2405
" interface %s", self.interface)
2406
elif error.errno == errno.ENOPROTOOPT:
2407
logger.error("SO_BINDTODEVICE not available;"
2408
" cannot bind to interface %s",
2409
self.interface)
2410
elif error.errno == errno.ENODEV:
2411
logger.error("Interface %s does not exist,"
2412
" cannot bind", self.interface)
2413
else:
2414
raise
548
2415
# Only bind(2) the socket if we really need to.
549
2416
if self.server_address[0] or self.server_address[1]:
550
2417
if not self.server_address[0]:
551
in6addr_any = "::"
552
self.server_address = (in6addr_any,
2418
if self.address_family == socket.AF_INET6:
2419
any_address = "::" # in6addr_any
2420
else:
2421
any_address = "0.0.0.0" # INADDR_ANY
2422
self.server_address = (any_address,
553
2423
self.server_address[1])
554
2424
elif not self.server_address[1]:
555
self.server_address = (self.server_address[0],
556
0)
557
# if self.settings["interface"]:
2425
self.server_address = (self.server_address[0], 0)
2426
# if self.interface:
558
2427
# self.server_address = (self.server_address[0],
559
2428
# 0, # port
560
2429
# 0, # flowinfo
561
2430
# if_nametoindex
562
# (self.settings
563
# ["interface"]))
564
return super(type(self), self).server_bind()
2431
# (self.interface))
2432
return socketserver.TCPServer.server_bind(self)
2433
2434
2435
class MandosServer(IPv6_TCPServer):
2436
"""Mandos server.
2437
2438
Attributes:
2439
clients: set of Client objects
2440
gnutls_priority GnuTLS priority string
2441
use_dbus: Boolean; to emit D-Bus signals or not
2442
2443
Assumes a gobject.MainLoop event loop.
2444
"""
2445
2446
def __init__(self, server_address, RequestHandlerClass,
2447
interface=None,
2448
use_ipv6=True,
2449
clients=None,
2450
gnutls_priority=None,
2451
use_dbus=True,
2452
socketfd=None):
2453
self.enabled = False
2454
self.clients = clients
2455
if self.clients is None:
2456
self.clients = {}
2457
self.use_dbus = use_dbus
2458
self.gnutls_priority = gnutls_priority
2459
IPv6_TCPServer.__init__(self, server_address,
2460
RequestHandlerClass,
2461
interface = interface,
2462
use_ipv6 = use_ipv6,
2463
socketfd = socketfd)
2464
2465
def server_activate(self):
2466
if self.enabled:
2467
return socketserver.TCPServer.server_activate(self)
2468
2469
def enable(self):
2470
self.enabled = True
2471
2472
def add_pipe(self, parent_pipe, proc):
2473
# Call "handle_ipc" for both data and EOF events
2474
gobject.io_add_watch(
2475
parent_pipe.fileno(),
2476
gobject.IO_IN | gobject.IO_HUP,
2477
functools.partial(self.handle_ipc,
2478
parent_pipe = parent_pipe,
2479
proc = proc))
2480
2481
def handle_ipc(self, source, condition,
2482
parent_pipe=None,
2483
proc = None,
2484
client_object=None):
2485
# error, or the other end of multiprocessing.Pipe has closed
2486
if condition & (gobject.IO_ERR | gobject.IO_HUP):
2487
# Wait for other process to exit
2488
proc.join()
2489
return False
2490
2491
# Read a request from the child
2492
request = parent_pipe.recv()
2493
command = request[0]
2494
2495
if command == 'init':
2496
fpr = request[1]
2497
address = request[2]
2498
2499
for c in self.clients.itervalues():
2500
if c.fingerprint == fpr:
2501
client = c
2502
break
2503
else:
2504
logger.info("Client not found for fingerprint: %s, ad"
2505
"dress: %s", fpr, address)
2506
if self.use_dbus:
2507
# Emit D-Bus signal
2508
mandos_dbus_service.ClientNotFound(fpr,
2509
address[0])
2510
parent_pipe.send(False)
2511
return False
2512
2513
gobject.io_add_watch(
2514
parent_pipe.fileno(),
2515
gobject.IO_IN | gobject.IO_HUP,
2516
functools.partial(self.handle_ipc,
2517
parent_pipe = parent_pipe,
2518
proc = proc,
2519
client_object = client))
2520
parent_pipe.send(True)
2521
# remove the old hook in favor of the new above hook on
2522
# same fileno
2523
return False
2524
if command == 'funcall':
2525
funcname = request[1]
2526
args = request[2]
2527
kwargs = request[3]
2528
2529
parent_pipe.send(('data', getattr(client_object,
2530
funcname)(*args,
2531
**kwargs)))
2532
2533
if command == 'getattr':
2534
attrname = request[1]
2535
if isinstance(client_object.__getattribute__(attrname),
2536
collections.Callable):
2537
parent_pipe.send(('function', ))
2538
else:
2539
parent_pipe.send((
2540
'data', client_object.__getattribute__(attrname)))
2541
2542
if command == 'setattr':
2543
attrname = request[1]
2544
value = request[2]
2545
setattr(client_object, attrname, value)
2546
2547
return True
2548
2549
2550
def rfc3339_duration_to_delta(duration):
2551
"""Parse an RFC 3339 "duration" and return a datetime.timedelta
2552
2553
>>> rfc3339_duration_to_delta("P7D")
2554
datetime.timedelta(7)
2555
>>> rfc3339_duration_to_delta("PT60S")
2556
datetime.timedelta(0, 60)
2557
>>> rfc3339_duration_to_delta("PT60M")
2558
datetime.timedelta(0, 3600)
2559
>>> rfc3339_duration_to_delta("PT24H")
2560
datetime.timedelta(1)
2561
>>> rfc3339_duration_to_delta("P1W")
2562
datetime.timedelta(7)
2563
>>> rfc3339_duration_to_delta("PT5M30S")
2564
datetime.timedelta(0, 330)
2565
>>> rfc3339_duration_to_delta("P1DT3M20S")
2566
datetime.timedelta(1, 200)
2567
"""
2568
2569
# Parsing an RFC 3339 duration with regular expressions is not
2570
# possible - there would have to be multiple places for the same
2571
# values, like seconds. The current code, while more esoteric, is
2572
# cleaner without depending on a parsing library. If Python had a
2573
# built-in library for parsing we would use it, but we'd like to
2574
# avoid excessive use of external libraries.
2575
2576
# New type for defining tokens, syntax, and semantics all-in-one
2577
Token = collections.namedtuple("Token", (
2578
"regexp", # To match token; if "value" is not None, must have
2579
# a "group" containing digits
2580
"value", # datetime.timedelta or None
2581
"followers")) # Tokens valid after this token
2582
# RFC 3339 "duration" tokens, syntax, and semantics; taken from
2583
# the "duration" ABNF definition in RFC 3339, Appendix A.
2584
token_end = Token(re.compile(r"$"), None, frozenset())
2585
token_second = Token(re.compile(r"(\d+)S"),
2586
datetime.timedelta(seconds=1),
2587
frozenset((token_end, )))
2588
token_minute = Token(re.compile(r"(\d+)M"),
2589
datetime.timedelta(minutes=1),
2590
frozenset((token_second, token_end)))
2591
token_hour = Token(re.compile(r"(\d+)H"),
2592
datetime.timedelta(hours=1),
2593
frozenset((token_minute, token_end)))
2594
token_time = Token(re.compile(r"T"),
2595
None,
2596
frozenset((token_hour, token_minute,
2597
token_second)))
2598
token_day = Token(re.compile(r"(\d+)D"),
2599
datetime.timedelta(days=1),
2600
frozenset((token_time, token_end)))
2601
token_month = Token(re.compile(r"(\d+)M"),
2602
datetime.timedelta(weeks=4),
2603
frozenset((token_day, token_end)))
2604
token_year = Token(re.compile(r"(\d+)Y"),
2605
datetime.timedelta(weeks=52),
2606
frozenset((token_month, token_end)))
2607
token_week = Token(re.compile(r"(\d+)W"),
2608
datetime.timedelta(weeks=1),
2609
frozenset((token_end, )))
2610
token_duration = Token(re.compile(r"P"), None,
2611
frozenset((token_year, token_month,
2612
token_day, token_time,
2613
token_week)))
2614
# Define starting values
2615
value = datetime.timedelta() # Value so far
2616
found_token = None
2617
followers = frozenset((token_duration, )) # Following valid tokens
2618
s = duration # String left to parse
2619
# Loop until end token is found
2620
while found_token is not token_end:
2621
# Search for any currently valid tokens
2622
for token in followers:
2623
match = token.regexp.match(s)
2624
if match is not None:
2625
# Token found
2626
if token.value is not None:
2627
# Value found, parse digits
2628
factor = int(match.group(1), 10)
2629
# Add to value so far
2630
value += factor * token.value
2631
# Strip token from string
2632
s = token.regexp.sub("", s, 1)
2633
# Go to found token
2634
found_token = token
2635
# Set valid next tokens
2636
followers = found_token.followers
2637
break
2638
else:
2639
# No currently valid tokens were found
2640
raise ValueError("Invalid RFC 3339 duration: {!r}"
2641
.format(duration))
2642
# End token found
2643
return value
565
2644
566
2645
567
2646
def string_to_delta(interval):
568
2647
"""Parse a string and return a datetime.timedelta
569
2648
570
2649
>>> string_to_delta('7d')
571
2650
datetime.timedelta(7)
572
2651
>>> string_to_delta('60s')
575
2654
datetime.timedelta(0, 3600)
576
2655
>>> string_to_delta('24h')
577
2656
datetime.timedelta(1)
578
>>> string_to_delta(u'1w')
2657
>>> string_to_delta('1w')
579
2658
datetime.timedelta(7)
580
2659
>>> string_to_delta('5m 30s')
581
2660
datetime.timedelta(0, 330)
582
2661
"""
2662
2663
try:
2664
return rfc3339_duration_to_delta(interval)
2665
except ValueError:
2666
pass
2667
583
2668
timevalue = datetime.timedelta(0)
584
2669
for s in interval.split():
585
2670
try:
586
suffix=unicode(s[-1])
587
value=int(s[:-1])
588
if suffix == u"d":
2671
suffix = s[-1]
2672
value = int(s[:-1])
2673
if suffix == "d":
589
2674
delta = datetime.timedelta(value)
590
elif suffix == u"s":
2675
elif suffix == "s":
591
2676
delta = datetime.timedelta(0, value)
592
elif suffix == u"m":
2677
elif suffix == "m":
593
2678
delta = datetime.timedelta(0, 0, 0, 0, value)
594
elif suffix == u"h":
2679
elif suffix == "h":
595
2680
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
596
elif suffix == u"w":
2681
elif suffix == "w":
597
2682
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
598
2683
else:
599
raise ValueError
600
except (ValueError, IndexError):
601
raise ValueError
2684
raise ValueError("Unknown suffix {!r}".format(suffix))
2685
except IndexError as e:
2686
raise ValueError(*(e.args))
602
2687
timevalue += delta
603
2688
return timevalue
604
2689
605
2690
606
def server_state_changed(state):
607
"""Derived from the Avahi example code"""
608
if state == avahi.SERVER_COLLISION:
609
logger.error(u"Zeroconf server name collision")
610
service.remove()
611
elif state == avahi.SERVER_RUNNING:
612
service.add()
613
614
615
def entry_group_state_changed(state, error):
616
"""Derived from the Avahi example code"""
617
logger.debug(u"Avahi state change: %i", state)
618
619
if state == avahi.ENTRY_GROUP_ESTABLISHED:
620
logger.debug(u"Zeroconf service established.")
621
elif state == avahi.ENTRY_GROUP_COLLISION:
622
logger.warning(u"Zeroconf service name collision.")
623
service.rename()
624
elif state == avahi.ENTRY_GROUP_FAILURE:
625
logger.critical(u"Avahi: Error in group state changed %s",
626
unicode(error))
627
raise AvahiGroupError("State changed: %s", str(error))
628
629
def if_nametoindex(interface):
630
"""Call the C function if_nametoindex(), or equivalent"""
631
global if_nametoindex
632
try:
633
if "ctypes.util" not in sys.modules:
634
import ctypes.util
635
if_nametoindex = ctypes.cdll.LoadLibrary\
636
(ctypes.util.find_library("c")).if_nametoindex
637
except (OSError, AttributeError):
638
if "struct" not in sys.modules:
639
import struct
640
if "fcntl" not in sys.modules:
641
import fcntl
642
def if_nametoindex(interface):
643
"Get an interface index the hard way, i.e. using fcntl()"
644
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
645
s = socket.socket()
646
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
647
struct.pack("16s16x", interface))
648
s.close()
649
interface_index = struct.unpack("I", ifreq[16:20])[0]
650
return interface_index
651
return if_nametoindex(interface)
652
653
654
2691
def daemon(nochdir = False, noclose = False):
655
2692
"""See daemon(3). Standard BSD Unix function.
2693
656
2694
This should really exist as os.daemon, but it doesn't (yet)."""
657
2695
if os.fork():
658
2696
sys.exit()
663
2701
sys.exit()
664
2702
if not noclose:
665
2703
# Close all standard open file descriptors
666
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2704
null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
667
2705
if not stat.S_ISCHR(os.fstat(null).st_mode):
668
2706
raise OSError(errno.ENODEV,
669
"/dev/null not a character device")
2707
"{} not a character device"
2708
.format(os.devnull))
670
2709
os.dup2(null, sys.stdin.fileno())
671
2710
os.dup2(null, sys.stdout.fileno())
672
2711
os.dup2(null, sys.stderr.fileno())
675
2714
676
2715
677
2716
def main():
678
global main_loop_started
679
main_loop_started = False
680
681
parser = OptionParser(version = "%%prog %s" % version)
682
parser.add_option("-i", "--interface", type="string",
683
metavar="IF", help="Bind to interface IF")
684
parser.add_option("-a", "--address", type="string",
685
help="Address to listen for requests on")
686
parser.add_option("-p", "--port", type="int",
687
help="Port number to receive requests on")
688
parser.add_option("--check", action="store_true", default=False,
689
help="Run self-test")
690
parser.add_option("--debug", action="store_true",
691
help="Debug mode; run in foreground and log to"
692
" terminal")
693
parser.add_option("--priority", type="string", help="GnuTLS"
694
" priority string (see GnuTLS documentation)")
695
parser.add_option("--servicename", type="string", metavar="NAME",
696
help="Zeroconf service name")
697
parser.add_option("--configdir", type="string",
698
default="/etc/mandos", metavar="DIR",
699
help="Directory to search for configuration"
700
" files")
701
(options, args) = parser.parse_args()
2717
2718
##################################################################
2719
# Parsing of options, both command line and config file
2720
2721
parser = argparse.ArgumentParser()
2722
parser.add_argument("-v", "--version", action="version",
2723
version = "%(prog)s {}".format(version),
2724
help="show version number and exit")
2725
parser.add_argument("-i", "--interface", metavar="IF",
2726
help="Bind to interface IF")
2727
parser.add_argument("-a", "--address",
2728
help="Address to listen for requests on")
2729
parser.add_argument("-p", "--port", type=int,
2730
help="Port number to receive requests on")
2731
parser.add_argument("--check", action="store_true",
2732
help="Run self-test")
2733
parser.add_argument("--debug", action="store_true",
2734
help="Debug mode; run in foreground and log"
2735
" to terminal", default=None)
2736
parser.add_argument("--debuglevel", metavar="LEVEL",
2737
help="Debug level for stdout output")
2738
parser.add_argument("--priority", help="GnuTLS"
2739
" priority string (see GnuTLS documentation)")
2740
parser.add_argument("--servicename",
2741
metavar="NAME", help="Zeroconf service name")
2742
parser.add_argument("--configdir",
2743
default="/etc/mandos", metavar="DIR",
2744
help="Directory to search for configuration"
2745
" files")
2746
parser.add_argument("--no-dbus", action="store_false",
2747
dest="use_dbus", help="Do not provide D-Bus"
2748
" system bus interface", default=None)
2749
parser.add_argument("--no-ipv6", action="store_false",
2750
dest="use_ipv6", help="Do not use IPv6",
2751
default=None)
2752
parser.add_argument("--no-restore", action="store_false",
2753
dest="restore", help="Do not restore stored"
2754
" state", default=None)
2755
parser.add_argument("--socket", type=int,
2756
help="Specify a file descriptor to a network"
2757
" socket to use instead of creating one")
2758
parser.add_argument("--statedir", metavar="DIR",
2759
help="Directory to save/restore state in")
2760
parser.add_argument("--foreground", action="store_true",
2761
help="Run in foreground", default=None)
2762
parser.add_argument("--no-zeroconf", action="store_false",
2763
dest="zeroconf", help="Do not use Zeroconf",
2764
default=None)
2765
2766
options = parser.parse_args()
702
2767
703
2768
if options.check:
704
2769
import doctest
705
doctest.testmod()
706
sys.exit()
2770
fail_count, test_count = doctest.testmod()
2771
sys.exit(os.EX_OK if fail_count == 0 else 1)
707
2772
708
2773
# Default values for config file for server-global settings
709
2774
server_defaults = { "interface": "",
711
2776
"port": "",
712
2777
"debug": "False",
713
2778
"priority":
714
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
2779
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
2780
":+SIGN-DSA-SHA256",
715
2781
"servicename": "Mandos",
716
}
2782
"use_dbus": "True",
2783
"use_ipv6": "True",
2784
"debuglevel": "",
2785
"restore": "True",
2786
"socket": "",
2787
"statedir": "/var/lib/mandos",
2788
"foreground": "False",
2789
"zeroconf": "True",
2790
}
717
2791
718
2792
# Parse config file for server-global settings
719
server_config = ConfigParser.SafeConfigParser(server_defaults)
2793
server_config = configparser.SafeConfigParser(server_defaults)
720
2794
del server_defaults
721
2795
server_config.read(os.path.join(options.configdir, "mandos.conf"))
722
2796
# Convert the SafeConfigParser object to a dict
723
2797
server_settings = server_config.defaults()
724
# Use getboolean on the boolean config option
725
server_settings["debug"] = server_config.getboolean\
726
("DEFAULT", "debug")
2798
# Use the appropriate methods on the non-string config options
2799
for option in ("debug", "use_dbus", "use_ipv6", "foreground"):
2800
server_settings[option] = server_config.getboolean("DEFAULT",
2801
option)
2802
if server_settings["port"]:
2803
server_settings["port"] = server_config.getint("DEFAULT",
2804
"port")
2805
if server_settings["socket"]:
2806
server_settings["socket"] = server_config.getint("DEFAULT",
2807
"socket")
2808
# Later, stdin will, and stdout and stderr might, be dup'ed
2809
# over with an opened os.devnull. But we don't want this to
2810
# happen with a supplied network socket.
2811
if 0 <= server_settings["socket"] <= 2:
2812
server_settings["socket"] = os.dup(server_settings
2813
["socket"])
727
2814
del server_config
728
2815
729
2816
# Override the settings from the config file with command line
730
2817
# options, if set.
731
2818
for option in ("interface", "address", "port", "debug",
732
"priority", "servicename", "configdir"):
2819
"priority", "servicename", "configdir", "use_dbus",
2820
"use_ipv6", "debuglevel", "restore", "statedir",
2821
"socket", "foreground", "zeroconf"):
733
2822
value = getattr(options, option)
734
2823
if value is not None:
735
2824
server_settings[option] = value
736
2825
del options
2826
# Force all strings to be unicode
2827
for option in server_settings.keys():
2828
if isinstance(server_settings[option], bytes):
2829
server_settings[option] = (server_settings[option]
2830
.decode("utf-8"))
2831
# Force all boolean options to be boolean
2832
for option in ("debug", "use_dbus", "use_ipv6", "restore",
2833
"foreground", "zeroconf"):
2834
server_settings[option] = bool(server_settings[option])
2835
# Debug implies foreground
2836
if server_settings["debug"]:
2837
server_settings["foreground"] = True
737
2838
# Now we have our good server settings in "server_settings"
738
2839
2840
##################################################################
2841
2842
if (not server_settings["zeroconf"]
2843
and not (server_settings["port"]
2844
or server_settings["socket"] != "")):
2845
parser.error("Needs port or socket to work without Zeroconf")
2846
2847
# For convenience
739
2848
debug = server_settings["debug"]
2849
debuglevel = server_settings["debuglevel"]
2850
use_dbus = server_settings["use_dbus"]
2851
use_ipv6 = server_settings["use_ipv6"]
2852
stored_state_path = os.path.join(server_settings["statedir"],
2853
stored_state_file)
2854
foreground = server_settings["foreground"]
2855
zeroconf = server_settings["zeroconf"]
740
2856
741
if not debug:
742
syslogger.setLevel(logging.WARNING)
743
console.setLevel(logging.WARNING)
2857
if debug:
2858
initlogger(debug, logging.DEBUG)
2859
else:
2860
if not debuglevel:
2861
initlogger(debug)
2862
else:
2863
level = getattr(logging, debuglevel.upper())
2864
initlogger(debug, level)
744
2865
745
2866
if server_settings["servicename"] != "Mandos":
746
syslogger.setFormatter(logging.Formatter\
747
('Mandos (%s): %%(levelname)s:'
748
' %%(message)s'
749
% server_settings["servicename"]))
2867
syslogger.setFormatter(
2868
logging.Formatter('Mandos ({}) [%(process)d]:'
2869
' %(levelname)s: %(message)s'.format(
2870
server_settings["servicename"])))
750
2871
751
2872
# Parse config file with clients
752
client_defaults = { "timeout": "1h",
753
"interval": "5m",
754
"checker": "fping -q -- %(host)s",
755
"host": "",
756
}
757
client_config = ConfigParser.SafeConfigParser(client_defaults)
2873
client_config = configparser.SafeConfigParser(Client
2874
.client_defaults)
758
2875
client_config.read(os.path.join(server_settings["configdir"],
759
2876
"clients.conf"))
760
2877
761
global service
762
service = AvahiService(name = server_settings["servicename"],
763
type = "_mandos._tcp", );
764
if server_settings["interface"]:
765
service.interface = if_nametoindex\
766
(server_settings["interface"])
2878
global mandos_dbus_service
2879
mandos_dbus_service = None
2880
2881
socketfd = None
2882
if server_settings["socket"] != "":
2883
socketfd = server_settings["socket"]
2884
tcp_server = MandosServer(
2885
(server_settings["address"], server_settings["port"]),
2886
ClientHandler,
2887
interface=(server_settings["interface"] or None),
2888
use_ipv6=use_ipv6,
2889
gnutls_priority=server_settings["priority"],
2890
use_dbus=use_dbus,
2891
socketfd=socketfd)
2892
if not foreground:
2893
pidfilename = "/run/mandos.pid"
2894
if not os.path.isdir("/run/."):
2895
pidfilename = "/var/run/mandos.pid"
2896
pidfile = None
2897
try:
2898
pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
2899
except IOError as e:
2900
logger.error("Could not open file %r", pidfilename,
2901
exc_info=e)
2902
2903
for name in ("_mandos", "mandos", "nobody"):
2904
try:
2905
uid = pwd.getpwnam(name).pw_uid
2906
gid = pwd.getpwnam(name).pw_gid
2907
break
2908
except KeyError:
2909
continue
2910
else:
2911
uid = 65534
2912
gid = 65534
2913
try:
2914
os.setgid(gid)
2915
os.setuid(uid)
2916
except OSError as error:
2917
if error.errno != errno.EPERM:
2918
raise
2919
2920
if debug:
2921
# Enable all possible GnuTLS debugging
2922
2923
# "Use a log level over 10 to enable all debugging options."
2924
# - GnuTLS manual
2925
gnutls.global_set_log_level(11)
2926
2927
@gnutls.log_func
2928
def debug_gnutls(level, string):
2929
logger.debug("GnuTLS: %s", string[:-1])
2930
2931
gnutls.global_set_log_function(debug_gnutls)
2932
2933
# Redirect stdin so all checkers get /dev/null
2934
null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2935
os.dup2(null, sys.stdin.fileno())
2936
if null > 2:
2937
os.close(null)
2938
2939
# Need to fork before connecting to D-Bus
2940
if not foreground:
2941
# Close all input and output, do double fork, etc.
2942
daemon()
2943
2944
# multiprocessing will use threads, so before we use gobject we
2945
# need to inform gobject that threads will be used.
2946
gobject.threads_init()
767
2947
768
2948
global main_loop
769
global bus
770
global server
771
2949
# From the Avahi example code
772
DBusGMainLoop(set_as_default=True )
2950
DBusGMainLoop(set_as_default=True)
773
2951
main_loop = gobject.MainLoop()
774
2952
bus = dbus.SystemBus()
775
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
776
avahi.DBUS_PATH_SERVER),
777
avahi.DBUS_INTERFACE_SERVER)
778
2953
# End of Avahi example code
779
780
clients = Set()
781
def remove_from_clients(client):
782
clients.remove(client)
783
if not clients:
784
logger.critical(u"No clients left, exiting")
785
sys.exit()
786
787
clients.update(Set(Client(name = section,
788
stop_hook = remove_from_clients,
789
config
790
= dict(client_config.items(section)))
791
for section in client_config.sections()))
792
if not clients:
793
logger.critical(u"No clients defined")
794
sys.exit(1)
795
796
if debug:
797
# Redirect stdin so all checkers get /dev/null
798
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
799
os.dup2(null, sys.stdin.fileno())
800
if null > 2:
801
os.close(null)
802
else:
803
# No console logging
804
logger.removeHandler(console)
805
# Close all input and output, do double fork, etc.
806
daemon()
807
808
pidfilename = "/var/run/mandos/mandos.pid"
809
pid = os.getpid()
810
try:
811
pidfile = open(pidfilename, "w")
812
pidfile.write(str(pid) + "\n")
813
pidfile.close()
2954
if use_dbus:
2955
try:
2956
bus_name = dbus.service.BusName("se.recompile.Mandos",
2957
bus,
2958
do_not_queue=True)
2959
old_bus_name = dbus.service.BusName(
2960
"se.bsnet.fukt.Mandos", bus,
2961
do_not_queue=True)
2962
except dbus.exceptions.DBusException as e:
2963
logger.error("Disabling D-Bus:", exc_info=e)
2964
use_dbus = False
2965
server_settings["use_dbus"] = False
2966
tcp_server.use_dbus = False
2967
if zeroconf:
2968
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2969
service = AvahiServiceToSyslog(
2970
name = server_settings["servicename"],
2971
servicetype = "_mandos._tcp",
2972
protocol = protocol,
2973
bus = bus)
2974
if server_settings["interface"]:
2975
service.interface = if_nametoindex(
2976
server_settings["interface"].encode("utf-8"))
2977
2978
global multiprocessing_manager
2979
multiprocessing_manager = multiprocessing.Manager()
2980
2981
client_class = Client
2982
if use_dbus:
2983
client_class = functools.partial(ClientDBus, bus = bus)
2984
2985
client_settings = Client.config_parser(client_config)
2986
old_client_settings = {}
2987
clients_data = {}
2988
2989
# This is used to redirect stdout and stderr for checker processes
2990
global wnull
2991
wnull = open(os.devnull, "w") # A writable /dev/null
2992
# Only used if server is running in foreground but not in debug
2993
# mode
2994
if debug or not foreground:
2995
wnull.close()
2996
2997
# Get client data and settings from last running state.
2998
if server_settings["restore"]:
2999
try:
3000
with open(stored_state_path, "rb") as stored_state:
3001
clients_data, old_client_settings = pickle.load(
3002
stored_state)
3003
os.remove(stored_state_path)
3004
except IOError as e:
3005
if e.errno == errno.ENOENT:
3006
logger.warning("Could not load persistent state:"
3007
" {}".format(os.strerror(e.errno)))
3008
else:
3009
logger.critical("Could not load persistent state:",
3010
exc_info=e)
3011
raise
3012
except EOFError as e:
3013
logger.warning("Could not load persistent state: "
3014
"EOFError:",
3015
exc_info=e)
3016
3017
with PGPEngine() as pgp:
3018
for client_name, client in clients_data.items():
3019
# Skip removed clients
3020
if client_name not in client_settings:
3021
continue
3022
3023
# Decide which value to use after restoring saved state.
3024
# We have three different values: Old config file,
3025
# new config file, and saved state.
3026
# New config value takes precedence if it differs from old
3027
# config value, otherwise use saved state.
3028
for name, value in client_settings[client_name].items():
3029
try:
3030
# For each value in new config, check if it
3031
# differs from the old config value (Except for
3032
# the "secret" attribute)
3033
if (name != "secret"
3034
and (value !=
3035
old_client_settings[client_name][name])):
3036
client[name] = value
3037
except KeyError:
3038
pass
3039
3040
# Clients who has passed its expire date can still be
3041
# enabled if its last checker was successful. A Client
3042
# whose checker succeeded before we stored its state is
3043
# assumed to have successfully run all checkers during
3044
# downtime.
3045
if client["enabled"]:
3046
if datetime.datetime.utcnow() >= client["expires"]:
3047
if not client["last_checked_ok"]:
3048
logger.warning(
3049
"disabling client {} - Client never "
3050
"performed a successful checker".format(
3051
client_name))
3052
client["enabled"] = False
3053
elif client["last_checker_status"] != 0:
3054
logger.warning(
3055
"disabling client {} - Client last"
3056
" checker failed with error code"
3057
" {}".format(
3058
client_name,
3059
client["last_checker_status"]))
3060
client["enabled"] = False
3061
else:
3062
client["expires"] = (
3063
datetime.datetime.utcnow()
3064
+ client["timeout"])
3065
logger.debug("Last checker succeeded,"
3066
" keeping {} enabled".format(
3067
client_name))
3068
try:
3069
client["secret"] = pgp.decrypt(
3070
client["encrypted_secret"],
3071
client_settings[client_name]["secret"])
3072
except PGPError:
3073
# If decryption fails, we use secret from new settings
3074
logger.debug("Failed to decrypt {} old secret".format(
3075
client_name))
3076
client["secret"] = (client_settings[client_name]
3077
["secret"])
3078
3079
# Add/remove clients based on new changes made to config
3080
for client_name in (set(old_client_settings)
3081
- set(client_settings)):
3082
del clients_data[client_name]
3083
for client_name in (set(client_settings)
3084
- set(old_client_settings)):
3085
clients_data[client_name] = client_settings[client_name]
3086
3087
# Create all client objects
3088
for client_name, client in clients_data.items():
3089
tcp_server.clients[client_name] = client_class(
3090
name = client_name,
3091
settings = client,
3092
server_settings = server_settings)
3093
3094
if not tcp_server.clients:
3095
logger.warning("No clients defined")
3096
3097
if not foreground:
3098
if pidfile is not None:
3099
pid = os.getpid()
3100
try:
3101
with pidfile:
3102
print(pid, file=pidfile)
3103
except IOError:
3104
logger.error("Could not write to file %r with PID %d",
3105
pidfilename, pid)
814
3106
del pidfile
815
except IOError, err:
816
logger.error(u"Could not write %s file with PID %d",
817
pidfilename, os.getpid())
3107
del pidfilename
3108
3109
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
3110
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
3111
3112
if use_dbus:
3113
3114
@alternate_dbus_interfaces(
3115
{ "se.recompile.Mandos": "se.bsnet.fukt.Mandos" })
3116
class MandosDBusService(DBusObjectWithObjectManager):
3117
"""A D-Bus proxy object"""
3118
3119
def __init__(self):
3120
dbus.service.Object.__init__(self, bus, "/")
3121
3122
_interface = "se.recompile.Mandos"
3123
3124
@dbus.service.signal(_interface, signature="o")
3125
def ClientAdded(self, objpath):
3126
"D-Bus signal"
3127
pass
3128
3129
@dbus.service.signal(_interface, signature="ss")
3130
def ClientNotFound(self, fingerprint, address):
3131
"D-Bus signal"
3132
pass
3133
3134
@dbus_annotations({"org.freedesktop.DBus.Deprecated":
3135
"true"})
3136
@dbus.service.signal(_interface, signature="os")
3137
def ClientRemoved(self, objpath, name):
3138
"D-Bus signal"
3139
pass
3140
3141
@dbus_annotations({"org.freedesktop.DBus.Deprecated":
3142
"true"})
3143
@dbus.service.method(_interface, out_signature="ao")
3144
def GetAllClients(self):
3145
"D-Bus method"
3146
return dbus.Array(c.dbus_object_path for c in
3147
tcp_server.clients.itervalues())
3148
3149
@dbus_annotations({"org.freedesktop.DBus.Deprecated":
3150
"true"})
3151
@dbus.service.method(_interface,
3152
out_signature="a{oa{sv}}")
3153
def GetAllClientsWithProperties(self):
3154
"D-Bus method"
3155
return dbus.Dictionary(
3156
{ c.dbus_object_path: c.GetAll(
3157
"se.recompile.Mandos.Client")
3158
for c in tcp_server.clients.itervalues() },
3159
signature="oa{sv}")
3160
3161
@dbus.service.method(_interface, in_signature="o")
3162
def RemoveClient(self, object_path):
3163
"D-Bus method"
3164
for c in tcp_server.clients.itervalues():
3165
if c.dbus_object_path == object_path:
3166
del tcp_server.clients[c.name]
3167
c.remove_from_connection()
3168
# Don't signal the disabling
3169
c.disable(quiet=True)
3170
# Emit D-Bus signal for removal
3171
self.client_removed_signal(c)
3172
return
3173
raise KeyError(object_path)
3174
3175
del _interface
3176
3177
@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3178
out_signature = "a{oa{sa{sv}}}")
3179
def GetManagedObjects(self):
3180
"""D-Bus method"""
3181
return dbus.Dictionary(
3182
{ client.dbus_object_path:
3183
dbus.Dictionary(
3184
{ interface: client.GetAll(interface)
3185
for interface in
3186
client._get_all_interface_names()})
3187
for client in tcp_server.clients.values()})
3188
3189
def client_added_signal(self, client):
3190
"""Send the new standard signal and the old signal"""
3191
if use_dbus:
3192
# New standard signal
3193
self.InterfacesAdded(
3194
client.dbus_object_path,
3195
dbus.Dictionary(
3196
{ interface: client.GetAll(interface)
3197
for interface in
3198
client._get_all_interface_names()}))
3199
# Old signal
3200
self.ClientAdded(client.dbus_object_path)
3201
3202
def client_removed_signal(self, client):
3203
"""Send the new standard signal and the old signal"""
3204
if use_dbus:
3205
# New standard signal
3206
self.InterfacesRemoved(
3207
client.dbus_object_path,
3208
client._get_all_interface_names())
3209
# Old signal
3210
self.ClientRemoved(client.dbus_object_path,
3211
client.name)
3212
3213
mandos_dbus_service = MandosDBusService()
818
3214
819
3215
def cleanup():
820
3216
"Cleanup function; run on exit"
821
global group
822
# From the Avahi example code
823
if not group is None:
824
group.Free()
825
group = None
826
# End of Avahi example code
827
828
while clients:
829
client = clients.pop()
830
client.stop_hook = None
831
client.stop()
3217
if zeroconf:
3218
service.cleanup()
3219
3220
multiprocessing.active_children()
3221
wnull.close()
3222
if not (tcp_server.clients or client_settings):
3223
return
3224
3225
# Store client before exiting. Secrets are encrypted with key
3226
# based on what config file has. If config file is
3227
# removed/edited, old secret will thus be unrecovable.
3228
clients = {}
3229
with PGPEngine() as pgp:
3230
for client in tcp_server.clients.itervalues():
3231
key = client_settings[client.name]["secret"]
3232
client.encrypted_secret = pgp.encrypt(client.secret,
3233
key)
3234
client_dict = {}
3235
3236
# A list of attributes that can not be pickled
3237
# + secret.
3238
exclude = { "bus", "changedstate", "secret",
3239
"checker", "server_settings" }
3240
for name, typ in inspect.getmembers(dbus.service
3241
.Object):
3242
exclude.add(name)
3243
3244
client_dict["encrypted_secret"] = (client
3245
.encrypted_secret)
3246
for attr in client.client_structure:
3247
if attr not in exclude:
3248
client_dict[attr] = getattr(client, attr)
3249
3250
clients[client.name] = client_dict
3251
del client_settings[client.name]["secret"]
3252
3253
try:
3254
with tempfile.NamedTemporaryFile(
3255
mode='wb',
3256
suffix=".pickle",
3257
prefix='clients-',
3258
dir=os.path.dirname(stored_state_path),
3259
delete=False) as stored_state:
3260
pickle.dump((clients, client_settings), stored_state)
3261
tempname = stored_state.name
3262
os.rename(tempname, stored_state_path)
3263
except (IOError, OSError) as e:
3264
if not debug:
3265
try:
3266
os.remove(tempname)
3267
except NameError:
3268
pass
3269
if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3270
logger.warning("Could not save persistent state: {}"
3271
.format(os.strerror(e.errno)))
3272
else:
3273
logger.warning("Could not save persistent state:",
3274
exc_info=e)
3275
raise
3276
3277
# Delete all clients, and settings from config
3278
while tcp_server.clients:
3279
name, client = tcp_server.clients.popitem()
3280
if use_dbus:
3281
client.remove_from_connection()
3282
# Don't signal the disabling
3283
client.disable(quiet=True)
3284
# Emit D-Bus signal for removal
3285
if use_dbus:
3286
mandos_dbus_service.client_removed_signal(client)
3287
client_settings.clear()
832
3288
833
3289
atexit.register(cleanup)
834
3290
835
if not debug:
836
signal.signal(signal.SIGINT, signal.SIG_IGN)
837
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
838
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
839
840
for client in clients:
841
client.start()
842
843
tcp_server = IPv6_TCPServer((server_settings["address"],
844
server_settings["port"]),
845
tcp_handler,
846
settings=server_settings,
847
clients=clients)
3291
for client in tcp_server.clients.itervalues():
3292
if use_dbus:
3293
# Emit D-Bus signal for adding
3294
mandos_dbus_service.client_added_signal(client)
3295
# Need to initiate checking of clients
3296
if client.enabled:
3297
client.init_checker()
3298
3299
tcp_server.enable()
3300
tcp_server.server_activate()
3301
848
3302
# Find out what port we got
849
service.port = tcp_server.socket.getsockname()[1]
850
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
851
u" scope_id %d" % tcp_server.socket.getsockname())
3303
if zeroconf:
3304
service.port = tcp_server.socket.getsockname()[1]
3305
if use_ipv6:
3306
logger.info("Now listening on address %r, port %d,"
3307
" flowinfo %d, scope_id %d",
3308
*tcp_server.socket.getsockname())
3309
else: # IPv4
3310
logger.info("Now listening on address %r, port %d",
3311
*tcp_server.socket.getsockname())
852
3312
853
3313
#service.interface = tcp_server.socket.getsockname()[3]
854
3314
855
3315
try:
856
# From the Avahi example code
857
server.connect_to_signal("StateChanged", server_state_changed)
858
try:
859
server_state_changed(server.GetState())
860
except dbus.exceptions.DBusException, error:
861
logger.critical(u"DBusException: %s", error)
862
sys.exit(1)
863
# End of Avahi example code
3316
if zeroconf:
3317
# From the Avahi example code
3318
try:
3319
service.activate()
3320
except dbus.exceptions.DBusException as error:
3321
logger.critical("D-Bus Exception", exc_info=error)
3322
cleanup()
3323
sys.exit(1)
3324
# End of Avahi example code
864
3325
865
3326
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
866
3327
lambda *args, **kwargs:
867
tcp_server.handle_request\
868
(*args[2:], **kwargs) or True)
3328
(tcp_server.handle_request
3329
(*args[2:], **kwargs) or True))
869
3330
870
logger.debug(u"Starting main loop")
871
main_loop_started = True
3331
logger.debug("Starting main loop")
872
3332
main_loop.run()
873
except AvahiError, error:
874
logger.critical(u"AvahiError: %s" + unicode(error))
3333
except AvahiError as error:
3334
logger.critical("Avahi Error", exc_info=error)
3335
cleanup()
875
3336
sys.exit(1)
876
3337
except KeyboardInterrupt:
877
3338
if debug:
878
print
3339
print("", file=sys.stderr)
3340
logger.debug("Server received KeyboardInterrupt")
3341
logger.debug("Server exiting")
3342
# Must run before the D-Bus bus name gets deregistered
3343
cleanup()
3344
879
3345
880
3346
if __name__ == '__main__':
881
3347
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0