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- Committer: Teddy Hogeborn
- Date: 2008-06-21 00:53:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20080621005332-s4scjdpevuso4lsd
* server.py: Bug fix: Do "from __future__ import division".
(Client.__init__): Bug fix: parse interval string from config file.
(Client.check_action): Take no arguments. Print some debugging
output. Reset "checker" to None.
(Client.start_checker): Sleep 10 seconds before pinging to alleviate
debugging.
(Client.next_stop): Bug fix: check if "last_seen" and/or "checker"
is None.
(Client.still_valid): Bug fix: check if "last_seen" is None.
(Client.handle): When finding the right password to send, use a list
comprehension and an index lookup instead of a generator expression to
a dict.
(IPv6_TCPServer.request_queue_size): Removed.
(in6addr_any): Moved inside "main".
(main): Changed "clients" to be a Set instead of a list. Bug fix:
Exit when/if all clients are removed. Call "select" with all client
checkers and a suitable timeout. Add some debugging output. Start
new checkers when needed and delete clients which have timed out.
(Client.__init__): Bug fix: parse interval string from config file.
(Client.check_action): Take no arguments. Print some debugging
output. Reset "checker" to None.
(Client.start_checker): Sleep 10 seconds before pinging to alleviate
debugging.
(Client.next_stop): Bug fix: check if "last_seen" and/or "checker"
is None.
(Client.still_valid): Bug fix: check if "last_seen" is None.
(Client.handle): When finding the right password to send, use a list
comprehension and an index lookup instead of a generator expression to
a dict.
(IPv6_TCPServer.request_queue_size): Removed.
(in6addr_any): Moved inside "main".
(main): Changed "clients" to be a Set instead of a list. Bug fix:
Exit when/if all clients are removed. Call "select" with all client
checkers and a suitable timeout. Add some debugging output. Start
new checkers when needed and delete clients which have timed out.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- plugins.d
- files renamed:
- clients.conf => mandos-clients.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
1
#!/usr/bin/python3 -bI
2
# -*- mode: python; after-save-hook: (lambda () (let ((command (if (fboundp 'file-local-name) (file-local-name (buffer-file-name)) (or (file-remote-p (buffer-file-name) 'localname) (buffer-file-name))))) (if (= (progn (if (get-buffer "*Test*") (kill-buffer "*Test*")) (process-file-shell-command (format "%s --check" (shell-quote-argument command)) nil "*Test*")) 0) (let ((w (get-buffer-window "*Test*"))) (if w (delete-window w))) (progn (with-current-buffer "*Test*" (compilation-mode)) (display-buffer "*Test*" '(display-buffer-in-side-window)))))); coding: utf-8 -*-
3
#
4
# Mandos server - give out binary blobs to connecting clients.
5
#
6
# This program is partly derived from an example program for an Avahi
7
# service publisher, downloaded from
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add", "remove", "server_state_changed",
10
# "entry_group_state_changed", "cleanup", and "activate" in the
11
# "AvahiService" class, and some lines in "main".
12
#
13
# Everything else is
14
# Copyright © 2008-2019 Teddy Hogeborn
15
# Copyright © 2008-2019 Björn Påhlsson
16
#
17
# This file is part of Mandos.
18
#
19
# Mandos is free software: you can redistribute it and/or modify it
20
# under the terms of the GNU General Public License as published by
21
# the Free Software Foundation, either version 3 of the License, or
22
# (at your option) any later version.
23
#
24
# Mandos is distributed in the hope that it will be useful, but
25
# WITHOUT ANY WARRANTY; without even the implied warranty of
26
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27
# GNU General Public License for more details.
28
#
29
# You should have received a copy of the GNU General Public License
30
# along with Mandos. If not, see <http://www.gnu.org/licenses/>.
31
#
32
# Contact the authors at <mandos@recompile.se>.
33
#
34
35
from __future__ import (division, absolute_import, print_function,
36
unicode_literals)
37
38
try:
39
from future_builtins import *
40
except ImportError:
41
pass
42
43
try:
44
import SocketServer as socketserver
45
except ImportError:
46
import socketserver
1
#!/usr/bin/python
2
3
from __future__ import division
4
5
import SocketServer
47
6
import socket
48
import argparse
7
import select
8
from optparse import OptionParser
49
9
import datetime
50
10
import errno
51
try:
52
import ConfigParser as configparser
53
except ImportError:
54
import configparser
11
import gnutls.crypto
12
import gnutls.connection
13
import gnutls.errors
14
import ConfigParser
55
15
import sys
56
16
import re
57
17
import os
58
18
import signal
19
from sets import Set
59
20
import subprocess
60
import atexit
61
import stat
62
import logging
63
import logging.handlers
64
import pwd
65
import contextlib
66
import struct
67
import fcntl
68
import functools
69
try:
70
import cPickle as pickle
71
except ImportError:
72
import pickle
73
import multiprocessing
74
import types
75
import binascii
76
import tempfile
77
import itertools
78
import collections
79
import codecs
80
import unittest
81
import random
82
83
import dbus
84
import dbus.service
85
import gi
86
from gi.repository import GLib
87
from dbus.mainloop.glib import DBusGMainLoop
88
import ctypes
89
import ctypes.util
90
import xml.dom.minidom
91
import inspect
92
93
if sys.version_info.major == 2:
94
__metaclass__ = type
95
str = unicode
96
97
# Add collections.abc.Callable if it does not exist
98
try:
99
collections.abc.Callable
100
except AttributeError:
101
class abc:
102
Callable = collections.Callable
103
collections.abc = abc
104
del abc
105
106
# Show warnings by default
107
if not sys.warnoptions:
108
import warnings
109
warnings.simplefilter("default")
110
111
# Try to find the value of SO_BINDTODEVICE:
112
try:
113
# This is where SO_BINDTODEVICE is in Python 3.3 (or 3.4?) and
114
# newer, and it is also the most natural place for it:
115
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
116
except AttributeError:
117
try:
118
# This is where SO_BINDTODEVICE was up to and including Python
119
# 2.6, and also 3.2:
120
from IN import SO_BINDTODEVICE
121
except ImportError:
122
# In Python 2.7 it seems to have been removed entirely.
123
# Try running the C preprocessor:
124
try:
125
cc = subprocess.Popen(["cc", "--language=c", "-E",
126
"/dev/stdin"],
127
stdin=subprocess.PIPE,
128
stdout=subprocess.PIPE)
129
stdout = cc.communicate(
130
"#include <sys/socket.h>\nSO_BINDTODEVICE\n")[0]
131
SO_BINDTODEVICE = int(stdout.splitlines()[-1])
132
except (OSError, ValueError, IndexError):
133
# No value found
134
SO_BINDTODEVICE = None
135
136
if sys.version_info < (3, 2):
137
configparser.Configparser = configparser.SafeConfigParser
138
139
version = "1.8.9"
140
stored_state_file = "clients.pickle"
141
142
logger = logging.getLogger()
143
logging.captureWarnings(True) # Show warnings via the logging system
144
syslogger = None
145
146
try:
147
if_nametoindex = ctypes.cdll.LoadLibrary(
148
ctypes.util.find_library("c")).if_nametoindex
149
except (OSError, AttributeError):
150
151
def if_nametoindex(interface):
152
"Get an interface index the hard way, i.e. using fcntl()"
153
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
154
with contextlib.closing(socket.socket()) as s:
155
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
156
struct.pack(b"16s16x", interface))
157
interface_index = struct.unpack("I", ifreq[16:20])[0]
158
return interface_index
159
160
161
def copy_function(func):
162
"""Make a copy of a function"""
163
if sys.version_info.major == 2:
164
return types.FunctionType(func.func_code,
165
func.func_globals,
166
func.func_name,
167
func.func_defaults,
168
func.func_closure)
169
else:
170
return types.FunctionType(func.__code__,
171
func.__globals__,
172
func.__name__,
173
func.__defaults__,
174
func.__closure__)
175
176
177
def initlogger(debug, level=logging.WARNING):
178
"""init logger and add loglevel"""
179
180
global syslogger
181
syslogger = (logging.handlers.SysLogHandler(
182
facility=logging.handlers.SysLogHandler.LOG_DAEMON,
183
address="/dev/log"))
184
syslogger.setFormatter(logging.Formatter
185
('Mandos [%(process)d]: %(levelname)s:'
186
' %(message)s'))
187
logger.addHandler(syslogger)
188
189
if debug:
190
console = logging.StreamHandler()
191
console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
192
' [%(process)d]:'
193
' %(levelname)s:'
194
' %(message)s'))
195
logger.addHandler(console)
196
logger.setLevel(level)
197
198
199
class PGPError(Exception):
200
"""Exception if encryption/decryption fails"""
201
pass
202
203
204
class PGPEngine:
205
"""A simple class for OpenPGP symmetric encryption & decryption"""
206
207
def __init__(self):
208
self.tempdir = tempfile.mkdtemp(prefix="mandos-")
209
self.gpg = "gpg"
210
try:
211
output = subprocess.check_output(["gpgconf"])
212
for line in output.splitlines():
213
name, text, path = line.split(b":")
214
if name == b"gpg":
215
self.gpg = path
216
break
217
except OSError as e:
218
if e.errno != errno.ENOENT:
219
raise
220
self.gnupgargs = ['--batch',
221
'--homedir', self.tempdir,
222
'--force-mdc',
223
'--quiet']
224
# Only GPG version 1 has the --no-use-agent option.
225
if self.gpg == b"gpg" or self.gpg.endswith(b"/gpg"):
226
self.gnupgargs.append("--no-use-agent")
227
228
def __enter__(self):
229
return self
230
231
def __exit__(self, exc_type, exc_value, traceback):
232
self._cleanup()
233
return False
234
235
def __del__(self):
236
self._cleanup()
237
238
def _cleanup(self):
239
if self.tempdir is not None:
240
# Delete contents of tempdir
241
for root, dirs, files in os.walk(self.tempdir,
242
topdown=False):
243
for filename in files:
244
os.remove(os.path.join(root, filename))
245
for dirname in dirs:
246
os.rmdir(os.path.join(root, dirname))
247
# Remove tempdir
248
os.rmdir(self.tempdir)
249
self.tempdir = None
250
251
def password_encode(self, password):
252
# Passphrase can not be empty and can not contain newlines or
253
# NUL bytes. So we prefix it and hex encode it.
254
encoded = b"mandos" + binascii.hexlify(password)
255
if len(encoded) > 2048:
256
# GnuPG can't handle long passwords, so encode differently
257
encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
258
.replace(b"\n", b"\\n")
259
.replace(b"\0", b"\\x00"))
260
return encoded
261
262
def encrypt(self, data, password):
263
passphrase = self.password_encode(password)
264
with tempfile.NamedTemporaryFile(
265
dir=self.tempdir) as passfile:
266
passfile.write(passphrase)
267
passfile.flush()
268
proc = subprocess.Popen([self.gpg, '--symmetric',
269
'--passphrase-file',
270
passfile.name]
271
+ self.gnupgargs,
272
stdin=subprocess.PIPE,
273
stdout=subprocess.PIPE,
274
stderr=subprocess.PIPE)
275
ciphertext, err = proc.communicate(input=data)
276
if proc.returncode != 0:
277
raise PGPError(err)
278
return ciphertext
279
280
def decrypt(self, data, password):
281
passphrase = self.password_encode(password)
282
with tempfile.NamedTemporaryFile(
283
dir=self.tempdir) as passfile:
284
passfile.write(passphrase)
285
passfile.flush()
286
proc = subprocess.Popen([self.gpg, '--decrypt',
287
'--passphrase-file',
288
passfile.name]
289
+ self.gnupgargs,
290
stdin=subprocess.PIPE,
291
stdout=subprocess.PIPE,
292
stderr=subprocess.PIPE)
293
decrypted_plaintext, err = proc.communicate(input=data)
294
if proc.returncode != 0:
295
raise PGPError(err)
296
return decrypted_plaintext
297
298
299
# Pretend that we have an Avahi module
300
class avahi:
301
"""This isn't so much a class as it is a module-like namespace."""
302
IF_UNSPEC = -1 # avahi-common/address.h
303
PROTO_UNSPEC = -1 # avahi-common/address.h
304
PROTO_INET = 0 # avahi-common/address.h
305
PROTO_INET6 = 1 # avahi-common/address.h
306
DBUS_NAME = "org.freedesktop.Avahi"
307
DBUS_INTERFACE_ENTRY_GROUP = DBUS_NAME + ".EntryGroup"
308
DBUS_INTERFACE_SERVER = DBUS_NAME + ".Server"
309
DBUS_PATH_SERVER = "/"
310
311
@staticmethod
312
def string_array_to_txt_array(t):
313
return dbus.Array((dbus.ByteArray(s.encode("utf-8"))
314
for s in t), signature="ay")
315
ENTRY_GROUP_ESTABLISHED = 2 # avahi-common/defs.h
316
ENTRY_GROUP_COLLISION = 3 # avahi-common/defs.h
317
ENTRY_GROUP_FAILURE = 4 # avahi-common/defs.h
318
SERVER_INVALID = 0 # avahi-common/defs.h
319
SERVER_REGISTERING = 1 # avahi-common/defs.h
320
SERVER_RUNNING = 2 # avahi-common/defs.h
321
SERVER_COLLISION = 3 # avahi-common/defs.h
322
SERVER_FAILURE = 4 # avahi-common/defs.h
323
324
325
class AvahiError(Exception):
326
def __init__(self, value, *args, **kwargs):
327
self.value = value
328
return super(AvahiError, self).__init__(value, *args,
329
**kwargs)
330
331
332
class AvahiServiceError(AvahiError):
333
pass
334
335
336
class AvahiGroupError(AvahiError):
337
pass
338
339
340
class AvahiService:
341
"""An Avahi (Zeroconf) service.
342
343
Attributes:
344
interface: integer; avahi.IF_UNSPEC or an interface index.
345
Used to optionally bind to the specified interface.
346
name: string; Example: 'Mandos'
347
type: string; Example: '_mandos._tcp'.
348
See <https://www.iana.org/assignments/service-names-port-numbers>
349
port: integer; what port to announce
350
TXT: list of strings; TXT record for the service
351
domain: string; Domain to publish on, default to .local if empty.
352
host: string; Host to publish records for, default is localhost
353
max_renames: integer; maximum number of renames
354
rename_count: integer; counter so we only rename after collisions
355
a sensible number of times
356
group: D-Bus Entry Group
357
server: D-Bus Server
358
bus: dbus.SystemBus()
359
"""
360
361
def __init__(self,
362
interface=avahi.IF_UNSPEC,
363
name=None,
364
servicetype=None,
365
port=None,
366
TXT=None,
367
domain="",
368
host="",
369
max_renames=32768,
370
protocol=avahi.PROTO_UNSPEC,
371
bus=None):
372
self.interface = interface
373
self.name = name
374
self.type = servicetype
375
self.port = port
376
self.TXT = TXT if TXT is not None else []
377
self.domain = domain
378
self.host = host
379
self.rename_count = 0
380
self.max_renames = max_renames
381
self.protocol = protocol
382
self.group = None # our entry group
383
self.server = None
384
self.bus = bus
385
self.entry_group_state_changed_match = None
386
387
def rename(self, remove=True):
388
"""Derived from the Avahi example code"""
389
if self.rename_count >= self.max_renames:
390
logger.critical("No suitable Zeroconf service name found"
391
" after %i retries, exiting.",
392
self.rename_count)
393
raise AvahiServiceError("Too many renames")
394
self.name = str(
395
self.server.GetAlternativeServiceName(self.name))
396
self.rename_count += 1
397
logger.info("Changing Zeroconf service name to %r ...",
398
self.name)
399
if remove:
400
self.remove()
401
try:
402
self.add()
403
except dbus.exceptions.DBusException as error:
404
if (error.get_dbus_name()
405
== "org.freedesktop.Avahi.CollisionError"):
406
logger.info("Local Zeroconf service name collision.")
407
return self.rename(remove=False)
408
else:
409
logger.critical("D-Bus Exception", exc_info=error)
410
self.cleanup()
411
os._exit(1)
412
413
def remove(self):
414
"""Derived from the Avahi example code"""
415
if self.entry_group_state_changed_match is not None:
416
self.entry_group_state_changed_match.remove()
417
self.entry_group_state_changed_match = None
418
if self.group is not None:
419
self.group.Reset()
420
421
def add(self):
422
"""Derived from the Avahi example code"""
423
self.remove()
424
if self.group is None:
425
self.group = dbus.Interface(
426
self.bus.get_object(avahi.DBUS_NAME,
427
self.server.EntryGroupNew()),
428
avahi.DBUS_INTERFACE_ENTRY_GROUP)
429
self.entry_group_state_changed_match = (
430
self.group.connect_to_signal(
431
'StateChanged', self.entry_group_state_changed))
432
logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
433
self.name, self.type)
434
self.group.AddService(
435
self.interface,
436
self.protocol,
437
dbus.UInt32(0), # flags
438
self.name, self.type,
439
self.domain, self.host,
440
dbus.UInt16(self.port),
441
avahi.string_array_to_txt_array(self.TXT))
442
self.group.Commit()
443
444
def entry_group_state_changed(self, state, error):
445
"""Derived from the Avahi example code"""
446
logger.debug("Avahi entry group state change: %i", state)
447
448
if state == avahi.ENTRY_GROUP_ESTABLISHED:
449
logger.debug("Zeroconf service established.")
450
elif state == avahi.ENTRY_GROUP_COLLISION:
451
logger.info("Zeroconf service name collision.")
452
self.rename()
453
elif state == avahi.ENTRY_GROUP_FAILURE:
454
logger.critical("Avahi: Error in group state changed %s",
455
str(error))
456
raise AvahiGroupError("State changed: {!s}".format(error))
457
458
def cleanup(self):
459
"""Derived from the Avahi example code"""
460
if self.group is not None:
461
try:
462
self.group.Free()
463
except (dbus.exceptions.UnknownMethodException,
464
dbus.exceptions.DBusException):
465
pass
466
self.group = None
467
self.remove()
468
469
def server_state_changed(self, state, error=None):
470
"""Derived from the Avahi example code"""
471
logger.debug("Avahi server state change: %i", state)
472
bad_states = {
473
avahi.SERVER_INVALID: "Zeroconf server invalid",
474
avahi.SERVER_REGISTERING: None,
475
avahi.SERVER_COLLISION: "Zeroconf server name collision",
476
avahi.SERVER_FAILURE: "Zeroconf server failure",
477
}
478
if state in bad_states:
479
if bad_states[state] is not None:
480
if error is None:
481
logger.error(bad_states[state])
482
else:
483
logger.error(bad_states[state] + ": %r", error)
484
self.cleanup()
485
elif state == avahi.SERVER_RUNNING:
486
try:
487
self.add()
488
except dbus.exceptions.DBusException as error:
489
if (error.get_dbus_name()
490
== "org.freedesktop.Avahi.CollisionError"):
491
logger.info("Local Zeroconf service name"
492
" collision.")
493
return self.rename(remove=False)
494
else:
495
logger.critical("D-Bus Exception", exc_info=error)
496
self.cleanup()
497
os._exit(1)
498
else:
499
if error is None:
500
logger.debug("Unknown state: %r", state)
501
else:
502
logger.debug("Unknown state: %r: %r", state, error)
503
504
def activate(self):
505
"""Derived from the Avahi example code"""
506
if self.server is None:
507
self.server = dbus.Interface(
508
self.bus.get_object(avahi.DBUS_NAME,
509
avahi.DBUS_PATH_SERVER,
510
follow_name_owner_changes=True),
511
avahi.DBUS_INTERFACE_SERVER)
512
self.server.connect_to_signal("StateChanged",
513
self.server_state_changed)
514
self.server_state_changed(self.server.GetState())
515
516
517
class AvahiServiceToSyslog(AvahiService):
518
def rename(self, *args, **kwargs):
519
"""Add the new name to the syslog messages"""
520
ret = super(AvahiServiceToSyslog, self).rename(*args, **kwargs)
521
syslogger.setFormatter(logging.Formatter(
522
'Mandos ({}) [%(process)d]: %(levelname)s: %(message)s'
523
.format(self.name)))
524
return ret
525
526
527
# Pretend that we have a GnuTLS module
528
class gnutls:
529
"""This isn't so much a class as it is a module-like namespace."""
530
531
library = ctypes.util.find_library("gnutls")
532
if library is None:
533
library = ctypes.util.find_library("gnutls-deb0")
534
_library = ctypes.cdll.LoadLibrary(library)
535
del library
536
537
# Unless otherwise indicated, the constants and types below are
538
# all from the gnutls/gnutls.h C header file.
539
540
# Constants
541
E_SUCCESS = 0
542
E_INTERRUPTED = -52
543
E_AGAIN = -28
544
CRT_OPENPGP = 2
545
CRT_RAWPK = 3
546
CLIENT = 2
547
SHUT_RDWR = 0
548
CRD_CERTIFICATE = 1
549
E_NO_CERTIFICATE_FOUND = -49
550
X509_FMT_DER = 0
551
NO_TICKETS = 1<<10
552
ENABLE_RAWPK = 1<<18
553
CTYPE_PEERS = 3
554
KEYID_USE_SHA256 = 1 # gnutls/x509.h
555
OPENPGP_FMT_RAW = 0 # gnutls/openpgp.h
556
557
# Types
558
class session_int(ctypes.Structure):
559
_fields_ = []
560
session_t = ctypes.POINTER(session_int)
561
562
class certificate_credentials_st(ctypes.Structure):
563
_fields_ = []
564
certificate_credentials_t = ctypes.POINTER(
565
certificate_credentials_st)
566
certificate_type_t = ctypes.c_int
567
568
class datum_t(ctypes.Structure):
569
_fields_ = [('data', ctypes.POINTER(ctypes.c_ubyte)),
570
('size', ctypes.c_uint)]
571
572
class openpgp_crt_int(ctypes.Structure):
573
_fields_ = []
574
openpgp_crt_t = ctypes.POINTER(openpgp_crt_int)
575
openpgp_crt_fmt_t = ctypes.c_int # gnutls/openpgp.h
576
log_func = ctypes.CFUNCTYPE(None, ctypes.c_int, ctypes.c_char_p)
577
credentials_type_t = ctypes.c_int
578
transport_ptr_t = ctypes.c_void_p
579
close_request_t = ctypes.c_int
580
581
# Exceptions
582
class Error(Exception):
583
def __init__(self, message=None, code=None, args=()):
584
# Default usage is by a message string, but if a return
585
# code is passed, convert it to a string with
586
# gnutls.strerror()
587
self.code = code
588
if message is None and code is not None:
589
message = gnutls.strerror(code)
590
return super(gnutls.Error, self).__init__(
591
message, *args)
592
593
class CertificateSecurityError(Error):
594
pass
595
596
# Classes
597
class Credentials:
598
def __init__(self):
599
self._c_object = gnutls.certificate_credentials_t()
600
gnutls.certificate_allocate_credentials(
601
ctypes.byref(self._c_object))
602
self.type = gnutls.CRD_CERTIFICATE
603
604
def __del__(self):
605
gnutls.certificate_free_credentials(self._c_object)
606
607
class ClientSession:
608
def __init__(self, socket, credentials=None):
609
self._c_object = gnutls.session_t()
610
gnutls_flags = gnutls.CLIENT
611
if gnutls.check_version(b"3.5.6"):
612
gnutls_flags |= gnutls.NO_TICKETS
613
if gnutls.has_rawpk:
614
gnutls_flags |= gnutls.ENABLE_RAWPK
615
gnutls.init(ctypes.byref(self._c_object), gnutls_flags)
616
del gnutls_flags
617
gnutls.set_default_priority(self._c_object)
618
gnutls.transport_set_ptr(self._c_object, socket.fileno())
619
gnutls.handshake_set_private_extensions(self._c_object,
620
True)
621
self.socket = socket
622
if credentials is None:
623
credentials = gnutls.Credentials()
624
gnutls.credentials_set(self._c_object, credentials.type,
625
ctypes.cast(credentials._c_object,
626
ctypes.c_void_p))
627
self.credentials = credentials
628
629
def __del__(self):
630
gnutls.deinit(self._c_object)
631
632
def handshake(self):
633
return gnutls.handshake(self._c_object)
634
635
def send(self, data):
636
data = bytes(data)
637
data_len = len(data)
638
while data_len > 0:
639
data_len -= gnutls.record_send(self._c_object,
640
data[-data_len:],
641
data_len)
642
643
def bye(self):
644
return gnutls.bye(self._c_object, gnutls.SHUT_RDWR)
645
646
# Error handling functions
647
def _error_code(result):
648
"""A function to raise exceptions on errors, suitable
649
for the 'restype' attribute on ctypes functions"""
650
if result >= 0:
651
return result
652
if result == gnutls.E_NO_CERTIFICATE_FOUND:
653
raise gnutls.CertificateSecurityError(code=result)
654
raise gnutls.Error(code=result)
655
656
def _retry_on_error(result, func, arguments):
657
"""A function to retry on some errors, suitable
658
for the 'errcheck' attribute on ctypes functions"""
659
while result < 0:
660
if result not in (gnutls.E_INTERRUPTED, gnutls.E_AGAIN):
661
return _error_code(result)
662
result = func(*arguments)
663
return result
664
665
# Unless otherwise indicated, the function declarations below are
666
# all from the gnutls/gnutls.h C header file.
667
668
# Functions
669
priority_set_direct = _library.gnutls_priority_set_direct
670
priority_set_direct.argtypes = [session_t, ctypes.c_char_p,
671
ctypes.POINTER(ctypes.c_char_p)]
672
priority_set_direct.restype = _error_code
673
674
init = _library.gnutls_init
675
init.argtypes = [ctypes.POINTER(session_t), ctypes.c_int]
676
init.restype = _error_code
677
678
set_default_priority = _library.gnutls_set_default_priority
679
set_default_priority.argtypes = [session_t]
680
set_default_priority.restype = _error_code
681
682
record_send = _library.gnutls_record_send
683
record_send.argtypes = [session_t, ctypes.c_void_p,
684
ctypes.c_size_t]
685
record_send.restype = ctypes.c_ssize_t
686
record_send.errcheck = _retry_on_error
687
688
certificate_allocate_credentials = (
689
_library.gnutls_certificate_allocate_credentials)
690
certificate_allocate_credentials.argtypes = [
691
ctypes.POINTER(certificate_credentials_t)]
692
certificate_allocate_credentials.restype = _error_code
693
694
certificate_free_credentials = (
695
_library.gnutls_certificate_free_credentials)
696
certificate_free_credentials.argtypes = [
697
certificate_credentials_t]
698
certificate_free_credentials.restype = None
699
700
handshake_set_private_extensions = (
701
_library.gnutls_handshake_set_private_extensions)
702
handshake_set_private_extensions.argtypes = [session_t,
703
ctypes.c_int]
704
handshake_set_private_extensions.restype = None
705
706
credentials_set = _library.gnutls_credentials_set
707
credentials_set.argtypes = [session_t, credentials_type_t,
708
ctypes.c_void_p]
709
credentials_set.restype = _error_code
710
711
strerror = _library.gnutls_strerror
712
strerror.argtypes = [ctypes.c_int]
713
strerror.restype = ctypes.c_char_p
714
715
certificate_type_get = _library.gnutls_certificate_type_get
716
certificate_type_get.argtypes = [session_t]
717
certificate_type_get.restype = _error_code
718
719
certificate_get_peers = _library.gnutls_certificate_get_peers
720
certificate_get_peers.argtypes = [session_t,
721
ctypes.POINTER(ctypes.c_uint)]
722
certificate_get_peers.restype = ctypes.POINTER(datum_t)
723
724
global_set_log_level = _library.gnutls_global_set_log_level
725
global_set_log_level.argtypes = [ctypes.c_int]
726
global_set_log_level.restype = None
727
728
global_set_log_function = _library.gnutls_global_set_log_function
729
global_set_log_function.argtypes = [log_func]
730
global_set_log_function.restype = None
731
732
deinit = _library.gnutls_deinit
733
deinit.argtypes = [session_t]
734
deinit.restype = None
735
736
handshake = _library.gnutls_handshake
737
handshake.argtypes = [session_t]
738
handshake.restype = _error_code
739
handshake.errcheck = _retry_on_error
740
741
transport_set_ptr = _library.gnutls_transport_set_ptr
742
transport_set_ptr.argtypes = [session_t, transport_ptr_t]
743
transport_set_ptr.restype = None
744
745
bye = _library.gnutls_bye
746
bye.argtypes = [session_t, close_request_t]
747
bye.restype = _error_code
748
bye.errcheck = _retry_on_error
749
750
check_version = _library.gnutls_check_version
751
check_version.argtypes = [ctypes.c_char_p]
752
check_version.restype = ctypes.c_char_p
753
754
_need_version = b"3.3.0"
755
if check_version(_need_version) is None:
756
raise self.Error("Needs GnuTLS {} or later"
757
.format(_need_version))
758
759
_tls_rawpk_version = b"3.6.6"
760
has_rawpk = bool(check_version(_tls_rawpk_version))
761
762
if has_rawpk:
763
# Types
764
class pubkey_st(ctypes.Structure):
765
_fields = []
766
pubkey_t = ctypes.POINTER(pubkey_st)
767
768
x509_crt_fmt_t = ctypes.c_int
769
770
# All the function declarations below are from gnutls/abstract.h
771
pubkey_init = _library.gnutls_pubkey_init
772
pubkey_init.argtypes = [ctypes.POINTER(pubkey_t)]
773
pubkey_init.restype = _error_code
774
775
pubkey_import = _library.gnutls_pubkey_import
776
pubkey_import.argtypes = [pubkey_t, ctypes.POINTER(datum_t),
777
x509_crt_fmt_t]
778
pubkey_import.restype = _error_code
779
780
pubkey_get_key_id = _library.gnutls_pubkey_get_key_id
781
pubkey_get_key_id.argtypes = [pubkey_t, ctypes.c_int,
782
ctypes.POINTER(ctypes.c_ubyte),
783
ctypes.POINTER(ctypes.c_size_t)]
784
pubkey_get_key_id.restype = _error_code
785
786
pubkey_deinit = _library.gnutls_pubkey_deinit
787
pubkey_deinit.argtypes = [pubkey_t]
788
pubkey_deinit.restype = None
789
else:
790
# All the function declarations below are from gnutls/openpgp.h
791
792
openpgp_crt_init = _library.gnutls_openpgp_crt_init
793
openpgp_crt_init.argtypes = [ctypes.POINTER(openpgp_crt_t)]
794
openpgp_crt_init.restype = _error_code
795
796
openpgp_crt_import = _library.gnutls_openpgp_crt_import
797
openpgp_crt_import.argtypes = [openpgp_crt_t,
798
ctypes.POINTER(datum_t),
799
openpgp_crt_fmt_t]
800
openpgp_crt_import.restype = _error_code
801
802
openpgp_crt_verify_self = _library.gnutls_openpgp_crt_verify_self
803
openpgp_crt_verify_self.argtypes = [openpgp_crt_t, ctypes.c_uint,
804
ctypes.POINTER(ctypes.c_uint)]
805
openpgp_crt_verify_self.restype = _error_code
806
807
openpgp_crt_deinit = _library.gnutls_openpgp_crt_deinit
808
openpgp_crt_deinit.argtypes = [openpgp_crt_t]
809
openpgp_crt_deinit.restype = None
810
811
openpgp_crt_get_fingerprint = (
812
_library.gnutls_openpgp_crt_get_fingerprint)
813
openpgp_crt_get_fingerprint.argtypes = [openpgp_crt_t,
814
ctypes.c_void_p,
815
ctypes.POINTER(
816
ctypes.c_size_t)]
817
openpgp_crt_get_fingerprint.restype = _error_code
818
819
if check_version(b"3.6.4"):
820
certificate_type_get2 = _library.gnutls_certificate_type_get2
821
certificate_type_get2.argtypes = [session_t, ctypes.c_int]
822
certificate_type_get2.restype = _error_code
823
824
# Remove non-public functions
825
del _error_code, _retry_on_error
826
827
828
def call_pipe(connection, # : multiprocessing.Connection
829
func, *args, **kwargs):
830
"""This function is meant to be called by multiprocessing.Process
831
832
This function runs func(*args, **kwargs), and writes the resulting
833
return value on the provided multiprocessing.Connection.
834
"""
835
connection.send(func(*args, **kwargs))
836
connection.close()
837
838
839
class Client:
840
"""A representation of a client host served by this server.
841
842
Attributes:
843
approved: bool(); 'None' if not yet approved/disapproved
844
approval_delay: datetime.timedelta(); Time to wait for approval
845
approval_duration: datetime.timedelta(); Duration of one approval
846
checker: multiprocessing.Process(); a running checker process used
847
to see if the client lives. 'None' if no process is
848
running.
849
checker_callback_tag: a GLib event source tag, or None
850
checker_command: string; External command which is run to check
851
if client lives. %() expansions are done at
852
runtime with vars(self) as dict, so that for
853
instance %(name)s can be used in the command.
854
checker_initiator_tag: a GLib event source tag, or None
855
created: datetime.datetime(); (UTC) object creation
856
client_structure: Object describing what attributes a client has
857
and is used for storing the client at exit
858
current_checker_command: string; current running checker_command
859
disable_initiator_tag: a GLib event source tag, or None
860
enabled: bool()
861
fingerprint: string (40 or 32 hexadecimal digits); used to
862
uniquely identify an OpenPGP client
863
key_id: string (64 hexadecimal digits); used to uniquely identify
864
a client using raw public keys
865
host: string; available for use by the checker command
866
interval: datetime.timedelta(); How often to start a new checker
867
last_approval_request: datetime.datetime(); (UTC) or None
868
last_checked_ok: datetime.datetime(); (UTC) or None
869
last_checker_status: integer between 0 and 255 reflecting exit
870
status of last checker. -1 reflects crashed
871
checker, -2 means no checker completed yet.
872
last_checker_signal: The signal which killed the last checker, if
873
last_checker_status is -1
874
last_enabled: datetime.datetime(); (UTC) or None
875
name: string; from the config file, used in log messages and
876
D-Bus identifiers
877
secret: bytestring; sent verbatim (over TLS) to client
878
timeout: datetime.timedelta(); How long from last_checked_ok
879
until this client is disabled
880
extended_timeout: extra long timeout when secret has been sent
881
runtime_expansions: Allowed attributes for runtime expansion.
882
expires: datetime.datetime(); time (UTC) when a client will be
883
disabled, or None
884
server_settings: The server_settings dict from main()
885
"""
886
887
runtime_expansions = ("approval_delay", "approval_duration",
888
"created", "enabled", "expires", "key_id",
889
"fingerprint", "host", "interval",
890
"last_approval_request", "last_checked_ok",
891
"last_enabled", "name", "timeout")
892
client_defaults = {
893
"timeout": "PT5M",
894
"extended_timeout": "PT15M",
895
"interval": "PT2M",
896
"checker": "fping -q -- %%(host)s",
897
"host": "",
898
"approval_delay": "PT0S",
899
"approval_duration": "PT1S",
900
"approved_by_default": "True",
901
"enabled": "True",
902
}
903
904
@staticmethod
905
def config_parser(config):
906
"""Construct a new dict of client settings of this form:
907
{ client_name: {setting_name: value, ...}, ...}
908
with exceptions for any special settings as defined above.
909
NOTE: Must be a pure function. Must return the same result
910
value given the same arguments.
911
"""
912
settings = {}
913
for client_name in config.sections():
914
section = dict(config.items(client_name))
915
client = settings[client_name] = {}
916
917
client["host"] = section["host"]
918
# Reformat values from string types to Python types
919
client["approved_by_default"] = config.getboolean(
920
client_name, "approved_by_default")
921
client["enabled"] = config.getboolean(client_name,
922
"enabled")
923
924
# Uppercase and remove spaces from key_id and fingerprint
925
# for later comparison purposes with return value from the
926
# key_id() and fingerprint() functions
927
client["key_id"] = (section.get("key_id", "").upper()
928
.replace(" ", ""))
929
client["fingerprint"] = (section["fingerprint"].upper()
930
.replace(" ", ""))
931
if "secret" in section:
932
client["secret"] = codecs.decode(section["secret"]
933
.encode("utf-8"),
934
"base64")
935
elif "secfile" in section:
936
with open(os.path.expanduser(os.path.expandvars
937
(section["secfile"])),
938
"rb") as secfile:
939
client["secret"] = secfile.read()
940
else:
941
raise TypeError("No secret or secfile for section {}"
942
.format(section))
943
client["timeout"] = string_to_delta(section["timeout"])
944
client["extended_timeout"] = string_to_delta(
945
section["extended_timeout"])
946
client["interval"] = string_to_delta(section["interval"])
947
client["approval_delay"] = string_to_delta(
948
section["approval_delay"])
949
client["approval_duration"] = string_to_delta(
950
section["approval_duration"])
951
client["checker_command"] = section["checker"]
952
client["last_approval_request"] = None
953
client["last_checked_ok"] = None
954
client["last_checker_status"] = -2
955
956
return settings
957
958
def __init__(self, settings, name=None, server_settings=None):
959
self.name = name
960
if server_settings is None:
961
server_settings = {}
962
self.server_settings = server_settings
963
# adding all client settings
964
for setting, value in settings.items():
965
setattr(self, setting, value)
966
967
if self.enabled:
968
if not hasattr(self, "last_enabled"):
969
self.last_enabled = datetime.datetime.utcnow()
970
if not hasattr(self, "expires"):
971
self.expires = (datetime.datetime.utcnow()
972
+ self.timeout)
973
else:
974
self.last_enabled = None
975
self.expires = None
976
977
logger.debug("Creating client %r", self.name)
978
logger.debug(" Key ID: %s", self.key_id)
979
logger.debug(" Fingerprint: %s", self.fingerprint)
980
self.created = settings.get("created",
981
datetime.datetime.utcnow())
982
983
# attributes specific for this server instance
984
self.checker = None
985
self.checker_initiator_tag = None
986
self.disable_initiator_tag = None
987
self.checker_callback_tag = None
988
self.current_checker_command = None
989
self.approved = None
990
self.approvals_pending = 0
991
self.changedstate = multiprocessing_manager.Condition(
992
multiprocessing_manager.Lock())
993
self.client_structure = [attr
994
for attr in self.__dict__.keys()
995
if not attr.startswith("_")]
996
self.client_structure.append("client_structure")
997
998
for name, t in inspect.getmembers(
999
type(self), lambda obj: isinstance(obj, property)):
1000
if not name.startswith("_"):
1001
self.client_structure.append(name)
1002
1003
# Send notice to process children that client state has changed
1004
def send_changedstate(self):
1005
with self.changedstate:
1006
self.changedstate.notify_all()
1007
1008
def enable(self):
1009
"""Start this client's checker and timeout hooks"""
1010
if getattr(self, "enabled", False):
1011
# Already enabled
1012
return
1013
self.expires = datetime.datetime.utcnow() + self.timeout
1014
self.enabled = True
1015
self.last_enabled = datetime.datetime.utcnow()
1016
self.init_checker()
1017
self.send_changedstate()
1018
1019
def disable(self, quiet=True):
1020
"""Disable this client."""
1021
if not getattr(self, "enabled", False):
1022
return False
1023
if not quiet:
1024
logger.info("Disabling client %s", self.name)
1025
if getattr(self, "disable_initiator_tag", None) is not None:
1026
GLib.source_remove(self.disable_initiator_tag)
1027
self.disable_initiator_tag = None
1028
self.expires = None
1029
if getattr(self, "checker_initiator_tag", None) is not None:
1030
GLib.source_remove(self.checker_initiator_tag)
1031
self.checker_initiator_tag = None
1032
self.stop_checker()
1033
self.enabled = False
1034
if not quiet:
1035
self.send_changedstate()
1036
# Do not run this again if called by a GLib.timeout_add
1037
return False
1038
1039
def __del__(self):
1040
self.disable()
1041
1042
def init_checker(self):
1043
# Schedule a new checker to be started an 'interval' from now,
1044
# and every interval from then on.
1045
if self.checker_initiator_tag is not None:
1046
GLib.source_remove(self.checker_initiator_tag)
1047
self.checker_initiator_tag = GLib.timeout_add(
1048
random.randrange(int(self.interval.total_seconds() * 1000
1049
+ 1)),
1050
self.start_checker)
1051
# Schedule a disable() when 'timeout' has passed
1052
if self.disable_initiator_tag is not None:
1053
GLib.source_remove(self.disable_initiator_tag)
1054
self.disable_initiator_tag = GLib.timeout_add(
1055
int(self.timeout.total_seconds() * 1000), self.disable)
1056
# Also start a new checker *right now*.
1057
self.start_checker()
1058
1059
def checker_callback(self, source, condition, connection,
1060
command):
1061
"""The checker has completed, so take appropriate actions."""
1062
# Read return code from connection (see call_pipe)
1063
returncode = connection.recv()
1064
connection.close()
1065
if self.checker is not None:
1066
self.checker.join()
1067
self.checker_callback_tag = None
1068
self.checker = None
1069
1070
if returncode >= 0:
1071
self.last_checker_status = returncode
1072
self.last_checker_signal = None
1073
if self.last_checker_status == 0:
1074
logger.info("Checker for %(name)s succeeded",
1075
vars(self))
1076
self.checked_ok()
1077
else:
1078
logger.info("Checker for %(name)s failed", vars(self))
1079
else:
1080
self.last_checker_status = -1
1081
self.last_checker_signal = -returncode
1082
logger.warning("Checker for %(name)s crashed?",
1083
vars(self))
1084
return False
1085
1086
def checked_ok(self):
1087
"""Assert that the client has been seen, alive and well."""
1088
self.last_checked_ok = datetime.datetime.utcnow()
1089
self.last_checker_status = 0
1090
self.last_checker_signal = None
1091
self.bump_timeout()
1092
1093
def bump_timeout(self, timeout=None):
1094
"""Bump up the timeout for this client."""
21
22
class Client(object):
23
def __init__(self, name=None, options=None, dn=None,
24
password=None, passfile=None, fqdn=None,
25
timeout=None, interval=-1):
26
self.name = name
27
self.dn = dn
28
if password:
29
self.password = password
30
elif passfile:
31
self.password = open(passfile).readall()
32
else:
33
print "No Password or Passfile in client config file"
34
# raise RuntimeError XXX
35
self.password = "gazonk"
36
self.fqdn = fqdn # string
37
self.created = datetime.datetime.now()
38
self.last_seen = None # datetime.datetime()
1095
39
if timeout is None:
1096
timeout = self.timeout
1097
if self.disable_initiator_tag is not None:
1098
GLib.source_remove(self.disable_initiator_tag)
1099
self.disable_initiator_tag = None
1100
if getattr(self, "enabled", False):
1101
self.disable_initiator_tag = GLib.timeout_add(
1102
int(timeout.total_seconds() * 1000), self.disable)
1103
self.expires = datetime.datetime.utcnow() + timeout
1104
1105
def need_approval(self):
1106
self.last_approval_request = datetime.datetime.utcnow()
1107
40
timeout = options.timeout
41
self.timeout = timeout # datetime.timedelta()
42
if interval == -1:
43
interval = options.interval
44
else:
45
interval = string_to_delta(interval)
46
self.interval = interval # datetime.timedelta()
47
self.next_check = datetime.datetime.now() # datetime.datetime()
48
# Note: next_check may be in the past if checker is not None
49
self.checker = None # or a subprocess.Popen()
50
def check_action(self):
51
"""The checker said something and might have completed.
52
Check if is has, and take appropriate actions."""
53
if self.checker.poll() is None:
54
# False alarm, no result yet
55
#self.checker.read()
56
#print "Checker for %(name)s said nothing?" % vars(self)
57
return
58
now = datetime.datetime.now()
59
if self.checker.returncode == 0:
60
print "Checker for %(name)s succeeded" % vars(self)
61
self.last_seen = now
62
else:
63
print "Checker for %(name)s failed" % vars(self)
64
while self.next_check <= now:
65
self.next_check += self.interval
66
self.checker = None
67
handle_request = check_action
1108
68
def start_checker(self):
1109
"""Start a new checker subprocess if one is not running.
1110
1111
If a checker already exists, leave it running and do
1112
nothing."""
1113
# The reason for not killing a running checker is that if we
1114
# did that, and if a checker (for some reason) started running
1115
# slowly and taking more than 'interval' time, then the client
1116
# would inevitably timeout, since no checker would get a
1117
# chance to run to completion. If we instead leave running
1118
# checkers alone, the checker would have to take more time
1119
# than 'timeout' for the client to be disabled, which is as it
1120
# should be.
1121
1122
if self.checker is not None and not self.checker.is_alive():
1123
logger.warning("Checker was not alive; joining")
1124
self.checker.join()
1125
self.checker = None
1126
# Start a new checker if needed
1127
if self.checker is None:
1128
# Escape attributes for the shell
1129
escaped_attrs = {
1130
attr: re.escape(str(getattr(self, attr)))
1131
for attr in self.runtime_expansions}
1132
try:
1133
command = self.checker_command % escaped_attrs
1134
except TypeError as error:
1135
logger.error('Could not format string "%s"',
1136
self.checker_command,
1137
exc_info=error)
1138
return True # Try again later
1139
self.current_checker_command = command
1140
logger.info("Starting checker %r for %s", command,
1141
self.name)
1142
# We don't need to redirect stdout and stderr, since
1143
# in normal mode, that is already done by daemon(),
1144
# and in debug mode we don't want to. (Stdin is
1145
# always replaced by /dev/null.)
1146
# The exception is when not debugging but nevertheless
1147
# running in the foreground; use the previously
1148
# created wnull.
1149
popen_args = {"close_fds": True,
1150
"shell": True,
1151
"cwd": "/"}
1152
if (not self.server_settings["debug"]
1153
and self.server_settings["foreground"]):
1154
popen_args.update({"stdout": wnull,
1155
"stderr": wnull})
1156
pipe = multiprocessing.Pipe(duplex=False)
1157
self.checker = multiprocessing.Process(
1158
target=call_pipe,
1159
args=(pipe[1], subprocess.call, command),
1160
kwargs=popen_args)
1161
self.checker.start()
1162
self.checker_callback_tag = GLib.io_add_watch(
1163
GLib.IOChannel.unix_new(pipe[0].fileno()),
1164
GLib.PRIORITY_DEFAULT, GLib.IO_IN,
1165
self.checker_callback, pipe[0], command)
1166
# Re-run this periodically if run by GLib.timeout_add
1167
return True
1168
69
self.stop_checker()
70
try:
71
self.checker = subprocess.Popen("sleep 10; fping -q -- %s"
72
% re.escape(self.fqdn),
73
stdout=subprocess.PIPE,
74
close_fds=True,
75
shell=True, cwd="/")
76
except subprocess.OSError, e:
77
print "Failed to start subprocess:", e
1169
78
def stop_checker(self):
1170
"""Force the checker process, if any, to stop."""
1171
if self.checker_callback_tag:
1172
GLib.source_remove(self.checker_callback_tag)
1173
self.checker_callback_tag = None
1174
if getattr(self, "checker", None) is None:
79
if self.checker is None:
1175
80
return
1176
logger.debug("Stopping checker for %(name)s", vars(self))
1177
self.checker.terminate()
81
os.kill(self.checker.pid, signal.SIGTERM)
82
if self.checker.poll() is None:
83
os.kill(self.checker.pid, signal.SIGKILL)
1178
84
self.checker = None
1179
1180
1181
def dbus_service_property(dbus_interface,
1182
signature="v",
1183
access="readwrite",
1184
byte_arrays=False):
1185
"""Decorators for marking methods of a DBusObjectWithProperties to
1186
become properties on the D-Bus.
1187
1188
The decorated method will be called with no arguments by "Get"
1189
and with one argument by "Set".
1190
1191
The parameters, where they are supported, are the same as
1192
dbus.service.method, except there is only "signature", since the
1193
type from Get() and the type sent to Set() is the same.
1194
"""
1195
# Encoding deeply encoded byte arrays is not supported yet by the
1196
# "Set" method, so we fail early here:
1197
if byte_arrays and signature != "ay":
1198
raise ValueError("Byte arrays not supported for non-'ay'"
1199
" signature {!r}".format(signature))
1200
1201
def decorator(func):
1202
func._dbus_is_property = True
1203
func._dbus_interface = dbus_interface
1204
func._dbus_signature = signature
1205
func._dbus_access = access
1206
func._dbus_name = func.__name__
1207
if func._dbus_name.endswith("_dbus_property"):
1208
func._dbus_name = func._dbus_name[:-14]
1209
func._dbus_get_args_options = {'byte_arrays': byte_arrays}
1210
return func
1211
1212
return decorator
1213
1214
1215
def dbus_interface_annotations(dbus_interface):
1216
"""Decorator for marking functions returning interface annotations
1217
1218
Usage:
1219
1220
@dbus_interface_annotations("org.example.Interface")
1221
def _foo(self): # Function name does not matter
1222
return {"org.freedesktop.DBus.Deprecated": "true",
1223
"org.freedesktop.DBus.Property.EmitsChangedSignal":
1224
"false"}
1225
"""
1226
1227
def decorator(func):
1228
func._dbus_is_interface = True
1229
func._dbus_interface = dbus_interface
1230
func._dbus_name = dbus_interface
1231
return func
1232
1233
return decorator
1234
1235
1236
def dbus_annotations(annotations):
1237
"""Decorator to annotate D-Bus methods, signals or properties
1238
Usage:
1239
1240
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
1241
"org.freedesktop.DBus.Property."
1242
"EmitsChangedSignal": "false"})
1243
@dbus_service_property("org.example.Interface", signature="b",
1244
access="r")
1245
def Property_dbus_property(self):
1246
return dbus.Boolean(False)
1247
1248
See also the DBusObjectWithAnnotations class.
1249
"""
1250
1251
def decorator(func):
1252
func._dbus_annotations = annotations
1253
return func
1254
1255
return decorator
1256
1257
1258
class DBusPropertyException(dbus.exceptions.DBusException):
1259
"""A base class for D-Bus property-related exceptions
1260
"""
1261
pass
1262
1263
1264
class DBusPropertyAccessException(DBusPropertyException):
1265
"""A property's access permissions disallows an operation.
1266
"""
1267
pass
1268
1269
1270
class DBusPropertyNotFound(DBusPropertyException):
1271
"""An attempt was made to access a non-existing property.
1272
"""
1273
pass
1274
1275
1276
class DBusObjectWithAnnotations(dbus.service.Object):
1277
"""A D-Bus object with annotations.
1278
1279
Classes inheriting from this can use the dbus_annotations
1280
decorator to add annotations to methods or signals.
1281
"""
1282
1283
@staticmethod
1284
def _is_dbus_thing(thing):
1285
"""Returns a function testing if an attribute is a D-Bus thing
1286
1287
If called like _is_dbus_thing("method") it returns a function
1288
suitable for use as predicate to inspect.getmembers().
1289
"""
1290
return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
1291
False)
1292
1293
def _get_all_dbus_things(self, thing):
1294
"""Returns a generator of (name, attribute) pairs
1295
"""
1296
return ((getattr(athing.__get__(self), "_dbus_name", name),
1297
athing.__get__(self))
1298
for cls in self.__class__.__mro__
1299
for name, athing in
1300
inspect.getmembers(cls, self._is_dbus_thing(thing)))
1301
1302
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1303
out_signature="s",
1304
path_keyword='object_path',
1305
connection_keyword='connection')
1306
def Introspect(self, object_path, connection):
1307
"""Overloading of standard D-Bus method.
1308
1309
Inserts annotation tags on methods and signals.
1310
"""
1311
xmlstring = dbus.service.Object.Introspect(self, object_path,
1312
connection)
1313
try:
1314
document = xml.dom.minidom.parseString(xmlstring)
1315
1316
for if_tag in document.getElementsByTagName("interface"):
1317
# Add annotation tags
1318
for typ in ("method", "signal"):
1319
for tag in if_tag.getElementsByTagName(typ):
1320
annots = dict()
1321
for name, prop in (self.
1322
_get_all_dbus_things(typ)):
1323
if (name == tag.getAttribute("name")
1324
and prop._dbus_interface
1325
== if_tag.getAttribute("name")):
1326
annots.update(getattr(
1327
prop, "_dbus_annotations", {}))
1328
for name, value in annots.items():
1329
ann_tag = document.createElement(
1330
"annotation")
1331
ann_tag.setAttribute("name", name)
1332
ann_tag.setAttribute("value", value)
1333
tag.appendChild(ann_tag)
1334
# Add interface annotation tags
1335
for annotation, value in dict(
1336
itertools.chain.from_iterable(
1337
annotations().items()
1338
for name, annotations
1339
in self._get_all_dbus_things("interface")
1340
if name == if_tag.getAttribute("name")
1341
)).items():
1342
ann_tag = document.createElement("annotation")
1343
ann_tag.setAttribute("name", annotation)
1344
ann_tag.setAttribute("value", value)
1345
if_tag.appendChild(ann_tag)
1346
# Fix argument name for the Introspect method itself
1347
if (if_tag.getAttribute("name")
1348
== dbus.INTROSPECTABLE_IFACE):
1349
for cn in if_tag.getElementsByTagName("method"):
1350
if cn.getAttribute("name") == "Introspect":
1351
for arg in cn.getElementsByTagName("arg"):
1352
if (arg.getAttribute("direction")
1353
== "out"):
1354
arg.setAttribute("name",
1355
"xml_data")
1356
xmlstring = document.toxml("utf-8")
1357
document.unlink()
1358
except (AttributeError, xml.dom.DOMException,
1359
xml.parsers.expat.ExpatError) as error:
1360
logger.error("Failed to override Introspection method",
1361
exc_info=error)
1362
return xmlstring
1363
1364
1365
class DBusObjectWithProperties(DBusObjectWithAnnotations):
1366
"""A D-Bus object with properties.
1367
1368
Classes inheriting from this can use the dbus_service_property
1369
decorator to expose methods as D-Bus properties. It exposes the
1370
standard Get(), Set(), and GetAll() methods on the D-Bus.
1371
"""
1372
1373
def _get_dbus_property(self, interface_name, property_name):
1374
"""Returns a bound method if one exists which is a D-Bus
1375
property with the specified name and interface.
1376
"""
1377
for cls in self.__class__.__mro__:
1378
for name, value in inspect.getmembers(
1379
cls, self._is_dbus_thing("property")):
1380
if (value._dbus_name == property_name
1381
and value._dbus_interface == interface_name):
1382
return value.__get__(self)
1383
1384
# No such property
1385
raise DBusPropertyNotFound("{}:{}.{}".format(
1386
self.dbus_object_path, interface_name, property_name))
1387
1388
@classmethod
1389
def _get_all_interface_names(cls):
1390
"""Get a sequence of all interfaces supported by an object"""
1391
return (name for name in set(getattr(getattr(x, attr),
1392
"_dbus_interface", None)
1393
for x in (inspect.getmro(cls))
1394
for attr in dir(x))
1395
if name is not None)
1396
1397
@dbus.service.method(dbus.PROPERTIES_IFACE,
1398
in_signature="ss",
1399
out_signature="v")
1400
def Get(self, interface_name, property_name):
1401
"""Standard D-Bus property Get() method, see D-Bus standard.
1402
"""
1403
prop = self._get_dbus_property(interface_name, property_name)
1404
if prop._dbus_access == "write":
1405
raise DBusPropertyAccessException(property_name)
1406
value = prop()
1407
if not hasattr(value, "variant_level"):
1408
return value
1409
return type(value)(value, variant_level=value.variant_level+1)
1410
1411
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
1412
def Set(self, interface_name, property_name, value):
1413
"""Standard D-Bus property Set() method, see D-Bus standard.
1414
"""
1415
prop = self._get_dbus_property(interface_name, property_name)
1416
if prop._dbus_access == "read":
1417
raise DBusPropertyAccessException(property_name)
1418
if prop._dbus_get_args_options["byte_arrays"]:
1419
# The byte_arrays option is not supported yet on
1420
# signatures other than "ay".
1421
if prop._dbus_signature != "ay":
1422
raise ValueError("Byte arrays not supported for non-"
1423
"'ay' signature {!r}"
1424
.format(prop._dbus_signature))
1425
value = dbus.ByteArray(bytes(value))
1426
prop(value)
1427
1428
@dbus.service.method(dbus.PROPERTIES_IFACE,
1429
in_signature="s",
1430
out_signature="a{sv}")
1431
def GetAll(self, interface_name):
1432
"""Standard D-Bus property GetAll() method, see D-Bus
1433
standard.
1434
1435
Note: Will not include properties with access="write".
1436
"""
1437
properties = {}
1438
for name, prop in self._get_all_dbus_things("property"):
1439
if (interface_name
1440
and interface_name != prop._dbus_interface):
1441
# Interface non-empty but did not match
1442
continue
1443
# Ignore write-only properties
1444
if prop._dbus_access == "write":
1445
continue
1446
value = prop()
1447
if not hasattr(value, "variant_level"):
1448
properties[name] = value
1449
continue
1450
properties[name] = type(value)(
1451
value, variant_level=value.variant_level + 1)
1452
return dbus.Dictionary(properties, signature="sv")
1453
1454
@dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
1455
def PropertiesChanged(self, interface_name, changed_properties,
1456
invalidated_properties):
1457
"""Standard D-Bus PropertiesChanged() signal, see D-Bus
1458
standard.
1459
"""
1460
pass
1461
1462
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1463
out_signature="s",
1464
path_keyword='object_path',
1465
connection_keyword='connection')
1466
def Introspect(self, object_path, connection):
1467
"""Overloading of standard D-Bus method.
1468
1469
Inserts property tags and interface annotation tags.
1470
"""
1471
xmlstring = DBusObjectWithAnnotations.Introspect(self,
1472
object_path,
1473
connection)
1474
try:
1475
document = xml.dom.minidom.parseString(xmlstring)
1476
1477
def make_tag(document, name, prop):
1478
e = document.createElement("property")
1479
e.setAttribute("name", name)
1480
e.setAttribute("type", prop._dbus_signature)
1481
e.setAttribute("access", prop._dbus_access)
1482
return e
1483
1484
for if_tag in document.getElementsByTagName("interface"):
1485
# Add property tags
1486
for tag in (make_tag(document, name, prop)
1487
for name, prop
1488
in self._get_all_dbus_things("property")
1489
if prop._dbus_interface
1490
== if_tag.getAttribute("name")):
1491
if_tag.appendChild(tag)
1492
# Add annotation tags for properties
1493
for tag in if_tag.getElementsByTagName("property"):
1494
annots = dict()
1495
for name, prop in self._get_all_dbus_things(
1496
"property"):
1497
if (name == tag.getAttribute("name")
1498
and prop._dbus_interface
1499
== if_tag.getAttribute("name")):
1500
annots.update(getattr(
1501
prop, "_dbus_annotations", {}))
1502
for name, value in annots.items():
1503
ann_tag = document.createElement(
1504
"annotation")
1505
ann_tag.setAttribute("name", name)
1506
ann_tag.setAttribute("value", value)
1507
tag.appendChild(ann_tag)
1508
# Add the names to the return values for the
1509
# "org.freedesktop.DBus.Properties" methods
1510
if (if_tag.getAttribute("name")
1511
== "org.freedesktop.DBus.Properties"):
1512
for cn in if_tag.getElementsByTagName("method"):
1513
if cn.getAttribute("name") == "Get":
1514
for arg in cn.getElementsByTagName("arg"):
1515
if (arg.getAttribute("direction")
1516
== "out"):
1517
arg.setAttribute("name", "value")
1518
elif cn.getAttribute("name") == "GetAll":
1519
for arg in cn.getElementsByTagName("arg"):
1520
if (arg.getAttribute("direction")
1521
== "out"):
1522
arg.setAttribute("name", "props")
1523
xmlstring = document.toxml("utf-8")
1524
document.unlink()
1525
except (AttributeError, xml.dom.DOMException,
1526
xml.parsers.expat.ExpatError) as error:
1527
logger.error("Failed to override Introspection method",
1528
exc_info=error)
1529
return xmlstring
1530
1531
1532
try:
1533
dbus.OBJECT_MANAGER_IFACE
1534
except AttributeError:
1535
dbus.OBJECT_MANAGER_IFACE = "org.freedesktop.DBus.ObjectManager"
1536
1537
1538
class DBusObjectWithObjectManager(DBusObjectWithAnnotations):
1539
"""A D-Bus object with an ObjectManager.
1540
1541
Classes inheriting from this exposes the standard
1542
GetManagedObjects call and the InterfacesAdded and
1543
InterfacesRemoved signals on the standard
1544
"org.freedesktop.DBus.ObjectManager" interface.
1545
1546
Note: No signals are sent automatically; they must be sent
1547
manually.
1548
"""
1549
@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
1550
out_signature="a{oa{sa{sv}}}")
1551
def GetManagedObjects(self):
1552
"""This function must be overridden"""
1553
raise NotImplementedError()
1554
1555
@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE,
1556
signature="oa{sa{sv}}")
1557
def InterfacesAdded(self, object_path, interfaces_and_properties):
1558
pass
1559
1560
@dbus.service.signal(dbus.OBJECT_MANAGER_IFACE, signature="oas")
1561
def InterfacesRemoved(self, object_path, interfaces):
1562
pass
1563
1564
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
1565
out_signature="s",
1566
path_keyword='object_path',
1567
connection_keyword='connection')
1568
def Introspect(self, object_path, connection):
1569
"""Overloading of standard D-Bus method.
1570
1571
Override return argument name of GetManagedObjects to be
1572
"objpath_interfaces_and_properties"
1573
"""
1574
xmlstring = DBusObjectWithAnnotations.Introspect(self,
1575
object_path,
1576
connection)
1577
try:
1578
document = xml.dom.minidom.parseString(xmlstring)
1579
1580
for if_tag in document.getElementsByTagName("interface"):
1581
# Fix argument name for the GetManagedObjects method
1582
if (if_tag.getAttribute("name")
1583
== dbus.OBJECT_MANAGER_IFACE):
1584
for cn in if_tag.getElementsByTagName("method"):
1585
if (cn.getAttribute("name")
1586
== "GetManagedObjects"):
1587
for arg in cn.getElementsByTagName("arg"):
1588
if (arg.getAttribute("direction")
1589
== "out"):
1590
arg.setAttribute(
1591
"name",
1592
"objpath_interfaces"
1593
"_and_properties")
1594
xmlstring = document.toxml("utf-8")
1595
document.unlink()
1596
except (AttributeError, xml.dom.DOMException,
1597
xml.parsers.expat.ExpatError) as error:
1598
logger.error("Failed to override Introspection method",
1599
exc_info=error)
1600
return xmlstring
1601
1602
1603
def datetime_to_dbus(dt, variant_level=0):
1604
"""Convert a UTC datetime.datetime() to a D-Bus type."""
1605
if dt is None:
1606
return dbus.String("", variant_level=variant_level)
1607
return dbus.String(dt.isoformat(), variant_level=variant_level)
1608
1609
1610
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1611
"""A class decorator; applied to a subclass of
1612
dbus.service.Object, it will add alternate D-Bus attributes with
1613
interface names according to the "alt_interface_names" mapping.
1614
Usage:
1615
1616
@alternate_dbus_interfaces({"org.example.Interface":
1617
"net.example.AlternateInterface"})
1618
class SampleDBusObject(dbus.service.Object):
1619
@dbus.service.method("org.example.Interface")
1620
def SampleDBusMethod():
1621
pass
1622
1623
The above "SampleDBusMethod" on "SampleDBusObject" will be
1624
reachable via two interfaces: "org.example.Interface" and
1625
"net.example.AlternateInterface", the latter of which will have
1626
its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1627
"true", unless "deprecate" is passed with a False value.
1628
1629
This works for methods and signals, and also for D-Bus properties
1630
(from DBusObjectWithProperties) and interfaces (from the
1631
dbus_interface_annotations decorator).
1632
"""
1633
1634
def wrapper(cls):
1635
for orig_interface_name, alt_interface_name in (
1636
alt_interface_names.items()):
1637
attr = {}
1638
interface_names = set()
1639
# Go though all attributes of the class
1640
for attrname, attribute in inspect.getmembers(cls):
1641
# Ignore non-D-Bus attributes, and D-Bus attributes
1642
# with the wrong interface name
1643
if (not hasattr(attribute, "_dbus_interface")
1644
or not attribute._dbus_interface.startswith(
1645
orig_interface_name)):
1646
continue
1647
# Create an alternate D-Bus interface name based on
1648
# the current name
1649
alt_interface = attribute._dbus_interface.replace(
1650
orig_interface_name, alt_interface_name)
1651
interface_names.add(alt_interface)
1652
# Is this a D-Bus signal?
1653
if getattr(attribute, "_dbus_is_signal", False):
1654
# Extract the original non-method undecorated
1655
# function by black magic
1656
if sys.version_info.major == 2:
1657
nonmethod_func = (dict(
1658
zip(attribute.func_code.co_freevars,
1659
attribute.__closure__))
1660
["func"].cell_contents)
1661
else:
1662
nonmethod_func = (dict(
1663
zip(attribute.__code__.co_freevars,
1664
attribute.__closure__))
1665
["func"].cell_contents)
1666
# Create a new, but exactly alike, function
1667
# object, and decorate it to be a new D-Bus signal
1668
# with the alternate D-Bus interface name
1669
new_function = copy_function(nonmethod_func)
1670
new_function = (dbus.service.signal(
1671
alt_interface,
1672
attribute._dbus_signature)(new_function))
1673
# Copy annotations, if any
1674
try:
1675
new_function._dbus_annotations = dict(
1676
attribute._dbus_annotations)
1677
except AttributeError:
1678
pass
1679
1680
# Define a creator of a function to call both the
1681
# original and alternate functions, so both the
1682
# original and alternate signals gets sent when
1683
# the function is called
1684
def fixscope(func1, func2):
1685
"""This function is a scope container to pass
1686
func1 and func2 to the "call_both" function
1687
outside of its arguments"""
1688
1689
@functools.wraps(func2)
1690
def call_both(*args, **kwargs):
1691
"""This function will emit two D-Bus
1692
signals by calling func1 and func2"""
1693
func1(*args, **kwargs)
1694
func2(*args, **kwargs)
1695
# Make wrapper function look like a D-Bus
1696
# signal
1697
for name, attr in inspect.getmembers(func2):
1698
if name.startswith("_dbus_"):
1699
setattr(call_both, name, attr)
1700
1701
return call_both
1702
# Create the "call_both" function and add it to
1703
# the class
1704
attr[attrname] = fixscope(attribute, new_function)
1705
# Is this a D-Bus method?
1706
elif getattr(attribute, "_dbus_is_method", False):
1707
# Create a new, but exactly alike, function
1708
# object. Decorate it to be a new D-Bus method
1709
# with the alternate D-Bus interface name. Add it
1710
# to the class.
1711
attr[attrname] = (
1712
dbus.service.method(
1713
alt_interface,
1714
attribute._dbus_in_signature,
1715
attribute._dbus_out_signature)
1716
(copy_function(attribute)))
1717
# Copy annotations, if any
1718
try:
1719
attr[attrname]._dbus_annotations = dict(
1720
attribute._dbus_annotations)
1721
except AttributeError:
1722
pass
1723
# Is this a D-Bus property?
1724
elif getattr(attribute, "_dbus_is_property", False):
1725
# Create a new, but exactly alike, function
1726
# object, and decorate it to be a new D-Bus
1727
# property with the alternate D-Bus interface
1728
# name. Add it to the class.
1729
attr[attrname] = (dbus_service_property(
1730
alt_interface, attribute._dbus_signature,
1731
attribute._dbus_access,
1732
attribute._dbus_get_args_options
1733
["byte_arrays"])
1734
(copy_function(attribute)))
1735
# Copy annotations, if any
1736
try:
1737
attr[attrname]._dbus_annotations = dict(
1738
attribute._dbus_annotations)
1739
except AttributeError:
1740
pass
1741
# Is this a D-Bus interface?
1742
elif getattr(attribute, "_dbus_is_interface", False):
1743
# Create a new, but exactly alike, function
1744
# object. Decorate it to be a new D-Bus interface
1745
# with the alternate D-Bus interface name. Add it
1746
# to the class.
1747
attr[attrname] = (
1748
dbus_interface_annotations(alt_interface)
1749
(copy_function(attribute)))
1750
if deprecate:
1751
# Deprecate all alternate interfaces
1752
iname = "_AlternateDBusNames_interface_annotation{}"
1753
for interface_name in interface_names:
1754
1755
@dbus_interface_annotations(interface_name)
1756
def func(self):
1757
return {"org.freedesktop.DBus.Deprecated":
1758
"true"}
1759
# Find an unused name
1760
for aname in (iname.format(i)
1761
for i in itertools.count()):
1762
if aname not in attr:
1763
attr[aname] = func
1764
break
1765
if interface_names:
1766
# Replace the class with a new subclass of it with
1767
# methods, signals, etc. as created above.
1768
if sys.version_info.major == 2:
1769
cls = type(b"{}Alternate".format(cls.__name__),
1770
(cls, ), attr)
1771
else:
1772
cls = type("{}Alternate".format(cls.__name__),
1773
(cls, ), attr)
1774
return cls
1775
1776
return wrapper
1777
1778
1779
@alternate_dbus_interfaces({"se.recompile.Mandos":
1780
"se.bsnet.fukt.Mandos"})
1781
class ClientDBus(Client, DBusObjectWithProperties):
1782
"""A Client class using D-Bus
1783
1784
Attributes:
1785
dbus_object_path: dbus.ObjectPath
1786
bus: dbus.SystemBus()
1787
"""
1788
1789
runtime_expansions = (Client.runtime_expansions
1790
+ ("dbus_object_path", ))
1791
1792
_interface = "se.recompile.Mandos.Client"
1793
1794
# dbus.service.Object doesn't use super(), so we can't either.
1795
1796
def __init__(self, bus=None, *args, **kwargs):
1797
self.bus = bus
1798
Client.__init__(self, *args, **kwargs)
1799
# Only now, when this client is initialized, can it show up on
1800
# the D-Bus
1801
client_object_name = str(self.name).translate(
1802
{ord("."): ord("_"),
1803
ord("-"): ord("_")})
1804
self.dbus_object_path = dbus.ObjectPath(
1805
"/clients/" + client_object_name)
1806
DBusObjectWithProperties.__init__(self, self.bus,
1807
self.dbus_object_path)
1808
1809
def notifychangeproperty(transform_func, dbus_name,
1810
type_func=lambda x: x,
1811
variant_level=1,
1812
invalidate_only=False,
1813
_interface=_interface):
1814
""" Modify a variable so that it's a property which announces
1815
its changes to DBus.
1816
1817
transform_fun: Function that takes a value and a variant_level
1818
and transforms it to a D-Bus type.
1819
dbus_name: D-Bus name of the variable
1820
type_func: Function that transform the value before sending it
1821
to the D-Bus. Default: no transform
1822
variant_level: D-Bus variant level. Default: 1
1823
"""
1824
attrname = "_{}".format(dbus_name)
1825
1826
def setter(self, value):
1827
if hasattr(self, "dbus_object_path"):
1828
if (not hasattr(self, attrname) or
1829
type_func(getattr(self, attrname, None))
1830
!= type_func(value)):
1831
if invalidate_only:
1832
self.PropertiesChanged(
1833
_interface, dbus.Dictionary(),
1834
dbus.Array((dbus_name, )))
1835
else:
1836
dbus_value = transform_func(
1837
type_func(value),
1838
variant_level=variant_level)
1839
self.PropertyChanged(dbus.String(dbus_name),
1840
dbus_value)
1841
self.PropertiesChanged(
1842
_interface,
1843
dbus.Dictionary({dbus.String(dbus_name):
1844
dbus_value}),
1845
dbus.Array())
1846
setattr(self, attrname, value)
1847
1848
return property(lambda self: getattr(self, attrname), setter)
1849
1850
expires = notifychangeproperty(datetime_to_dbus, "Expires")
1851
approvals_pending = notifychangeproperty(dbus.Boolean,
1852
"ApprovalPending",
1853
type_func=bool)
1854
enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1855
last_enabled = notifychangeproperty(datetime_to_dbus,
1856
"LastEnabled")
1857
checker = notifychangeproperty(
1858
dbus.Boolean, "CheckerRunning",
1859
type_func=lambda checker: checker is not None)
1860
last_checked_ok = notifychangeproperty(datetime_to_dbus,
1861
"LastCheckedOK")
1862
last_checker_status = notifychangeproperty(dbus.Int16,
1863
"LastCheckerStatus")
1864
last_approval_request = notifychangeproperty(
1865
datetime_to_dbus, "LastApprovalRequest")
1866
approved_by_default = notifychangeproperty(dbus.Boolean,
1867
"ApprovedByDefault")
1868
approval_delay = notifychangeproperty(
1869
dbus.UInt64, "ApprovalDelay",
1870
type_func=lambda td: td.total_seconds() * 1000)
1871
approval_duration = notifychangeproperty(
1872
dbus.UInt64, "ApprovalDuration",
1873
type_func=lambda td: td.total_seconds() * 1000)
1874
host = notifychangeproperty(dbus.String, "Host")
1875
timeout = notifychangeproperty(
1876
dbus.UInt64, "Timeout",
1877
type_func=lambda td: td.total_seconds() * 1000)
1878
extended_timeout = notifychangeproperty(
1879
dbus.UInt64, "ExtendedTimeout",
1880
type_func=lambda td: td.total_seconds() * 1000)
1881
interval = notifychangeproperty(
1882
dbus.UInt64, "Interval",
1883
type_func=lambda td: td.total_seconds() * 1000)
1884
checker_command = notifychangeproperty(dbus.String, "Checker")
1885
secret = notifychangeproperty(dbus.ByteArray, "Secret",
1886
invalidate_only=True)
1887
1888
del notifychangeproperty
1889
1890
def __del__(self, *args, **kwargs):
1891
try:
1892
self.remove_from_connection()
1893
except LookupError:
1894
pass
1895
if hasattr(DBusObjectWithProperties, "__del__"):
1896
DBusObjectWithProperties.__del__(self, *args, **kwargs)
1897
Client.__del__(self, *args, **kwargs)
1898
1899
def checker_callback(self, source, condition,
1900
connection, command, *args, **kwargs):
1901
ret = Client.checker_callback(self, source, condition,
1902
connection, command, *args,
1903
**kwargs)
1904
exitstatus = self.last_checker_status
1905
if exitstatus >= 0:
1906
# Emit D-Bus signal
1907
self.CheckerCompleted(dbus.Int16(exitstatus),
1908
# This is specific to GNU libC
1909
dbus.Int64(exitstatus << 8),
1910
dbus.String(command))
1911
else:
1912
# Emit D-Bus signal
1913
self.CheckerCompleted(dbus.Int16(-1),
1914
dbus.Int64(
1915
# This is specific to GNU libC
1916
(exitstatus << 8)
1917
| self.last_checker_signal),
1918
dbus.String(command))
1919
return ret
1920
1921
def start_checker(self, *args, **kwargs):
1922
old_checker_pid = getattr(self.checker, "pid", None)
1923
r = Client.start_checker(self, *args, **kwargs)
1924
# Only if new checker process was started
1925
if (self.checker is not None
1926
and old_checker_pid != self.checker.pid):
1927
# Emit D-Bus signal
1928
self.CheckerStarted(self.current_checker_command)
1929
return r
1930
1931
def _reset_approved(self):
1932
self.approved = None
1933
return False
1934
1935
def approve(self, value=True):
1936
self.approved = value
1937
GLib.timeout_add(int(self.approval_duration.total_seconds()
1938
* 1000), self._reset_approved)
1939
self.send_changedstate()
1940
1941
# D-Bus methods, signals & properties
1942
1943
# Interfaces
1944
1945
# Signals
1946
1947
# CheckerCompleted - signal
1948
@dbus.service.signal(_interface, signature="nxs")
1949
def CheckerCompleted(self, exitcode, waitstatus, command):
1950
"D-Bus signal"
1951
pass
1952
1953
# CheckerStarted - signal
1954
@dbus.service.signal(_interface, signature="s")
1955
def CheckerStarted(self, command):
1956
"D-Bus signal"
1957
pass
1958
1959
# PropertyChanged - signal
1960
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1961
@dbus.service.signal(_interface, signature="sv")
1962
def PropertyChanged(self, property, value):
1963
"D-Bus signal"
1964
pass
1965
1966
# GotSecret - signal
1967
@dbus.service.signal(_interface)
1968
def GotSecret(self):
1969
"""D-Bus signal
1970
Is sent after a successful transfer of secret from the Mandos
1971
server to mandos-client
1972
"""
1973
pass
1974
1975
# Rejected - signal
1976
@dbus.service.signal(_interface, signature="s")
1977
def Rejected(self, reason):
1978
"D-Bus signal"
1979
pass
1980
1981
# NeedApproval - signal
1982
@dbus.service.signal(_interface, signature="tb")
1983
def NeedApproval(self, timeout, default):
1984
"D-Bus signal"
1985
return self.need_approval()
1986
1987
# Methods
1988
1989
# Approve - method
1990
@dbus.service.method(_interface, in_signature="b")
1991
def Approve(self, value):
1992
self.approve(value)
1993
1994
# CheckedOK - method
1995
@dbus.service.method(_interface)
1996
def CheckedOK(self):
1997
self.checked_ok()
1998
1999
# Enable - method
2000
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2001
@dbus.service.method(_interface)
2002
def Enable(self):
2003
"D-Bus method"
2004
self.enable()
2005
2006
# StartChecker - method
2007
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2008
@dbus.service.method(_interface)
2009
def StartChecker(self):
2010
"D-Bus method"
2011
self.start_checker()
2012
2013
# Disable - method
2014
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2015
@dbus.service.method(_interface)
2016
def Disable(self):
2017
"D-Bus method"
2018
self.disable()
2019
2020
# StopChecker - method
2021
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
2022
@dbus.service.method(_interface)
2023
def StopChecker(self):
2024
self.stop_checker()
2025
2026
# Properties
2027
2028
# ApprovalPending - property
2029
@dbus_service_property(_interface, signature="b", access="read")
2030
def ApprovalPending_dbus_property(self):
2031
return dbus.Boolean(bool(self.approvals_pending))
2032
2033
# ApprovedByDefault - property
2034
@dbus_service_property(_interface,
2035
signature="b",
2036
access="readwrite")
2037
def ApprovedByDefault_dbus_property(self, value=None):
2038
if value is None: # get
2039
return dbus.Boolean(self.approved_by_default)
2040
self.approved_by_default = bool(value)
2041
2042
# ApprovalDelay - property
2043
@dbus_service_property(_interface,
2044
signature="t",
2045
access="readwrite")
2046
def ApprovalDelay_dbus_property(self, value=None):
2047
if value is None: # get
2048
return dbus.UInt64(self.approval_delay.total_seconds()
2049
* 1000)
2050
self.approval_delay = datetime.timedelta(0, 0, 0, value)
2051
2052
# ApprovalDuration - property
2053
@dbus_service_property(_interface,
2054
signature="t",
2055
access="readwrite")
2056
def ApprovalDuration_dbus_property(self, value=None):
2057
if value is None: # get
2058
return dbus.UInt64(self.approval_duration.total_seconds()
2059
* 1000)
2060
self.approval_duration = datetime.timedelta(0, 0, 0, value)
2061
2062
# Name - property
2063
@dbus_annotations(
2064
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2065
@dbus_service_property(_interface, signature="s", access="read")
2066
def Name_dbus_property(self):
2067
return dbus.String(self.name)
2068
2069
# KeyID - property
2070
@dbus_annotations(
2071
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2072
@dbus_service_property(_interface, signature="s", access="read")
2073
def KeyID_dbus_property(self):
2074
return dbus.String(self.key_id)
2075
2076
# Fingerprint - property
2077
@dbus_annotations(
2078
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2079
@dbus_service_property(_interface, signature="s", access="read")
2080
def Fingerprint_dbus_property(self):
2081
return dbus.String(self.fingerprint)
2082
2083
# Host - property
2084
@dbus_service_property(_interface,
2085
signature="s",
2086
access="readwrite")
2087
def Host_dbus_property(self, value=None):
2088
if value is None: # get
2089
return dbus.String(self.host)
2090
self.host = str(value)
2091
2092
# Created - property
2093
@dbus_annotations(
2094
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const"})
2095
@dbus_service_property(_interface, signature="s", access="read")
2096
def Created_dbus_property(self):
2097
return datetime_to_dbus(self.created)
2098
2099
# LastEnabled - property
2100
@dbus_service_property(_interface, signature="s", access="read")
2101
def LastEnabled_dbus_property(self):
2102
return datetime_to_dbus(self.last_enabled)
2103
2104
# Enabled - property
2105
@dbus_service_property(_interface,
2106
signature="b",
2107
access="readwrite")
2108
def Enabled_dbus_property(self, value=None):
2109
if value is None: # get
2110
return dbus.Boolean(self.enabled)
2111
if value:
2112
self.enable()
2113
else:
2114
self.disable()
2115
2116
# LastCheckedOK - property
2117
@dbus_service_property(_interface,
2118
signature="s",
2119
access="readwrite")
2120
def LastCheckedOK_dbus_property(self, value=None):
2121
if value is not None:
2122
self.checked_ok()
2123
return
2124
return datetime_to_dbus(self.last_checked_ok)
2125
2126
# LastCheckerStatus - property
2127
@dbus_service_property(_interface, signature="n", access="read")
2128
def LastCheckerStatus_dbus_property(self):
2129
return dbus.Int16(self.last_checker_status)
2130
2131
# Expires - property
2132
@dbus_service_property(_interface, signature="s", access="read")
2133
def Expires_dbus_property(self):
2134
return datetime_to_dbus(self.expires)
2135
2136
# LastApprovalRequest - property
2137
@dbus_service_property(_interface, signature="s", access="read")
2138
def LastApprovalRequest_dbus_property(self):
2139
return datetime_to_dbus(self.last_approval_request)
2140
2141
# Timeout - property
2142
@dbus_service_property(_interface,
2143
signature="t",
2144
access="readwrite")
2145
def Timeout_dbus_property(self, value=None):
2146
if value is None: # get
2147
return dbus.UInt64(self.timeout.total_seconds() * 1000)
2148
old_timeout = self.timeout
2149
self.timeout = datetime.timedelta(0, 0, 0, value)
2150
# Reschedule disabling
2151
if self.enabled:
2152
now = datetime.datetime.utcnow()
2153
self.expires += self.timeout - old_timeout
2154
if self.expires <= now:
2155
# The timeout has passed
2156
self.disable()
2157
else:
2158
if (getattr(self, "disable_initiator_tag", None)
2159
is None):
2160
return
2161
GLib.source_remove(self.disable_initiator_tag)
2162
self.disable_initiator_tag = GLib.timeout_add(
2163
int((self.expires - now).total_seconds() * 1000),
2164
self.disable)
2165
2166
# ExtendedTimeout - property
2167
@dbus_service_property(_interface,
2168
signature="t",
2169
access="readwrite")
2170
def ExtendedTimeout_dbus_property(self, value=None):
2171
if value is None: # get
2172
return dbus.UInt64(self.extended_timeout.total_seconds()
2173
* 1000)
2174
self.extended_timeout = datetime.timedelta(0, 0, 0, value)
2175
2176
# Interval - property
2177
@dbus_service_property(_interface,
2178
signature="t",
2179
access="readwrite")
2180
def Interval_dbus_property(self, value=None):
2181
if value is None: # get
2182
return dbus.UInt64(self.interval.total_seconds() * 1000)
2183
self.interval = datetime.timedelta(0, 0, 0, value)
2184
if getattr(self, "checker_initiator_tag", None) is None:
2185
return
2186
if self.enabled:
2187
# Reschedule checker run
2188
GLib.source_remove(self.checker_initiator_tag)
2189
self.checker_initiator_tag = GLib.timeout_add(
2190
value, self.start_checker)
2191
self.start_checker() # Start one now, too
2192
2193
# Checker - property
2194
@dbus_service_property(_interface,
2195
signature="s",
2196
access="readwrite")
2197
def Checker_dbus_property(self, value=None):
2198
if value is None: # get
2199
return dbus.String(self.checker_command)
2200
self.checker_command = str(value)
2201
2202
# CheckerRunning - property
2203
@dbus_service_property(_interface,
2204
signature="b",
2205
access="readwrite")
2206
def CheckerRunning_dbus_property(self, value=None):
2207
if value is None: # get
2208
return dbus.Boolean(self.checker is not None)
2209
if value:
2210
self.start_checker()
2211
else:
2212
self.stop_checker()
2213
2214
# ObjectPath - property
2215
@dbus_annotations(
2216
{"org.freedesktop.DBus.Property.EmitsChangedSignal": "const",
2217
"org.freedesktop.DBus.Deprecated": "true"})
2218
@dbus_service_property(_interface, signature="o", access="read")
2219
def ObjectPath_dbus_property(self):
2220
return self.dbus_object_path # is already a dbus.ObjectPath
2221
2222
# Secret = property
2223
@dbus_annotations(
2224
{"org.freedesktop.DBus.Property.EmitsChangedSignal":
2225
"invalidates"})
2226
@dbus_service_property(_interface,
2227
signature="ay",
2228
access="write",
2229
byte_arrays=True)
2230
def Secret_dbus_property(self, value):
2231
self.secret = bytes(value)
2232
2233
del _interface
2234
2235
2236
class ProxyClient:
2237
def __init__(self, child_pipe, key_id, fpr, address):
2238
self._pipe = child_pipe
2239
self._pipe.send(('init', key_id, fpr, address))
2240
if not self._pipe.recv():
2241
raise KeyError(key_id or fpr)
2242
2243
def __getattribute__(self, name):
2244
if name == '_pipe':
2245
return super(ProxyClient, self).__getattribute__(name)
2246
self._pipe.send(('getattr', name))
2247
data = self._pipe.recv()
2248
if data[0] == 'data':
2249
return data[1]
2250
if data[0] == 'function':
2251
2252
def func(*args, **kwargs):
2253
self._pipe.send(('funcall', name, args, kwargs))
2254
return self._pipe.recv()[1]
2255
2256
return func
2257
2258
def __setattr__(self, name, value):
2259
if name == '_pipe':
2260
return super(ProxyClient, self).__setattr__(name, value)
2261
self._pipe.send(('setattr', name, value))
2262
2263
2264
class ClientHandler(socketserver.BaseRequestHandler, object):
2265
"""A class to handle client connections.
2266
2267
Instantiated once for each connection to handle it.
2268
Note: This will run in its own forked process."""
2269
2270
def handle(self):
2271
with contextlib.closing(self.server.child_pipe) as child_pipe:
2272
logger.info("TCP connection from: %s",
2273
str(self.client_address))
2274
logger.debug("Pipe FD: %d",
2275
self.server.child_pipe.fileno())
2276
2277
session = gnutls.ClientSession(self.request)
2278
2279
# priority = ':'.join(("NONE", "+VERS-TLS1.1",
2280
# "+AES-256-CBC", "+SHA1",
2281
# "+COMP-NULL", "+CTYPE-OPENPGP",
2282
# "+DHE-DSS"))
2283
# Use a fallback default, since this MUST be set.
2284
priority = self.server.gnutls_priority
2285
if priority is None:
2286
priority = "NORMAL"
2287
gnutls.priority_set_direct(session._c_object,
2288
priority.encode("utf-8"),
2289
None)
2290
2291
# Start communication using the Mandos protocol
2292
# Get protocol number
2293
line = self.request.makefile().readline()
2294
logger.debug("Protocol version: %r", line)
2295
try:
2296
if int(line.strip().split()[0]) > 1:
2297
raise RuntimeError(line)
2298
except (ValueError, IndexError, RuntimeError) as error:
2299
logger.error("Unknown protocol version: %s", error)
2300
return
2301
2302
# Start GnuTLS connection
2303
try:
2304
session.handshake()
2305
except gnutls.Error as error:
2306
logger.warning("Handshake failed: %s", error)
2307
# Do not run session.bye() here: the session is not
2308
# established. Just abandon the request.
2309
return
2310
logger.debug("Handshake succeeded")
2311
2312
approval_required = False
2313
try:
2314
if gnutls.has_rawpk:
2315
fpr = b""
2316
try:
2317
key_id = self.key_id(
2318
self.peer_certificate(session))
2319
except (TypeError, gnutls.Error) as error:
2320
logger.warning("Bad certificate: %s", error)
2321
return
2322
logger.debug("Key ID: %s", key_id)
2323
2324
else:
2325
key_id = b""
2326
try:
2327
fpr = self.fingerprint(
2328
self.peer_certificate(session))
2329
except (TypeError, gnutls.Error) as error:
2330
logger.warning("Bad certificate: %s", error)
2331
return
2332
logger.debug("Fingerprint: %s", fpr)
2333
2334
try:
2335
client = ProxyClient(child_pipe, key_id, fpr,
2336
self.client_address)
2337
except KeyError:
2338
return
2339
2340
if client.approval_delay:
2341
delay = client.approval_delay
2342
client.approvals_pending += 1
2343
approval_required = True
2344
2345
while True:
2346
if not client.enabled:
2347
logger.info("Client %s is disabled",
2348
client.name)
2349
if self.server.use_dbus:
2350
# Emit D-Bus signal
2351
client.Rejected("Disabled")
2352
return
2353
2354
if client.approved or not client.approval_delay:
2355
# We are approved or approval is disabled
2356
break
2357
elif client.approved is None:
2358
logger.info("Client %s needs approval",
2359
client.name)
2360
if self.server.use_dbus:
2361
# Emit D-Bus signal
2362
client.NeedApproval(
2363
client.approval_delay.total_seconds()
2364
* 1000, client.approved_by_default)
2365
else:
2366
logger.warning("Client %s was not approved",
2367
client.name)
2368
if self.server.use_dbus:
2369
# Emit D-Bus signal
2370
client.Rejected("Denied")
2371
return
2372
2373
# wait until timeout or approved
2374
time = datetime.datetime.now()
2375
client.changedstate.acquire()
2376
client.changedstate.wait(delay.total_seconds())
2377
client.changedstate.release()
2378
time2 = datetime.datetime.now()
2379
if (time2 - time) >= delay:
2380
if not client.approved_by_default:
2381
logger.warning("Client %s timed out while"
2382
" waiting for approval",
2383
client.name)
2384
if self.server.use_dbus:
2385
# Emit D-Bus signal
2386
client.Rejected("Approval timed out")
2387
return
2388
else:
2389
break
2390
else:
2391
delay -= time2 - time
2392
2393
try:
2394
session.send(client.secret)
2395
except gnutls.Error as error:
2396
logger.warning("gnutls send failed",
2397
exc_info=error)
2398
return
2399
2400
logger.info("Sending secret to %s", client.name)
2401
# bump the timeout using extended_timeout
2402
client.bump_timeout(client.extended_timeout)
2403
if self.server.use_dbus:
2404
# Emit D-Bus signal
2405
client.GotSecret()
2406
2407
finally:
2408
if approval_required:
2409
client.approvals_pending -= 1
2410
try:
2411
session.bye()
2412
except gnutls.Error as error:
2413
logger.warning("GnuTLS bye failed",
2414
exc_info=error)
2415
2416
@staticmethod
2417
def peer_certificate(session):
2418
"Return the peer's certificate as a bytestring"
2419
try:
2420
cert_type = gnutls.certificate_type_get2(session._c_object,
2421
gnutls.CTYPE_PEERS)
2422
except AttributeError:
2423
cert_type = gnutls.certificate_type_get(session._c_object)
2424
if gnutls.has_rawpk:
2425
valid_cert_types = frozenset((gnutls.CRT_RAWPK,))
2426
else:
2427
valid_cert_types = frozenset((gnutls.CRT_OPENPGP,))
2428
# If not a valid certificate type...
2429
if cert_type not in valid_cert_types:
2430
logger.info("Cert type %r not in %r", cert_type,
2431
valid_cert_types)
2432
# ...return invalid data
2433
return b""
2434
list_size = ctypes.c_uint(1)
2435
cert_list = (gnutls.certificate_get_peers
2436
(session._c_object, ctypes.byref(list_size)))
2437
if not bool(cert_list) and list_size.value != 0:
2438
raise gnutls.Error("error getting peer certificate")
2439
if list_size.value == 0:
85
__del__ = stop_checker
86
def fileno(self):
87
if self.checker is None:
2440
88
return None
2441
cert = cert_list[0]
2442
return ctypes.string_at(cert.data, cert.size)
2443
2444
@staticmethod
2445
def key_id(certificate):
2446
"Convert a certificate bytestring to a hexdigit key ID"
2447
# New GnuTLS "datum" with the public key
2448
datum = gnutls.datum_t(
2449
ctypes.cast(ctypes.c_char_p(certificate),
2450
ctypes.POINTER(ctypes.c_ubyte)),
2451
ctypes.c_uint(len(certificate)))
2452
# XXX all these need to be created in the gnutls "module"
2453
# New empty GnuTLS certificate
2454
pubkey = gnutls.pubkey_t()
2455
gnutls.pubkey_init(ctypes.byref(pubkey))
2456
# Import the raw public key into the certificate
2457
gnutls.pubkey_import(pubkey,
2458
ctypes.byref(datum),
2459
gnutls.X509_FMT_DER)
2460
# New buffer for the key ID
2461
buf = ctypes.create_string_buffer(32)
2462
buf_len = ctypes.c_size_t(len(buf))
2463
# Get the key ID from the raw public key into the buffer
2464
gnutls.pubkey_get_key_id(pubkey,
2465
gnutls.KEYID_USE_SHA256,
2466
ctypes.cast(ctypes.byref(buf),
2467
ctypes.POINTER(ctypes.c_ubyte)),
2468
ctypes.byref(buf_len))
2469
# Deinit the certificate
2470
gnutls.pubkey_deinit(pubkey)
2471
2472
# Convert the buffer to a Python bytestring
2473
key_id = ctypes.string_at(buf, buf_len.value)
2474
# Convert the bytestring to hexadecimal notation
2475
hex_key_id = binascii.hexlify(key_id).upper()
2476
return hex_key_id
2477
2478
@staticmethod
2479
def fingerprint(openpgp):
2480
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
2481
# New GnuTLS "datum" with the OpenPGP public key
2482
datum = gnutls.datum_t(
2483
ctypes.cast(ctypes.c_char_p(openpgp),
2484
ctypes.POINTER(ctypes.c_ubyte)),
2485
ctypes.c_uint(len(openpgp)))
2486
# New empty GnuTLS certificate
2487
crt = gnutls.openpgp_crt_t()
2488
gnutls.openpgp_crt_init(ctypes.byref(crt))
2489
# Import the OpenPGP public key into the certificate
2490
gnutls.openpgp_crt_import(crt, ctypes.byref(datum),
2491
gnutls.OPENPGP_FMT_RAW)
2492
# Verify the self signature in the key
2493
crtverify = ctypes.c_uint()
2494
gnutls.openpgp_crt_verify_self(crt, 0,
2495
ctypes.byref(crtverify))
2496
if crtverify.value != 0:
2497
gnutls.openpgp_crt_deinit(crt)
2498
raise gnutls.CertificateSecurityError(code
2499
=crtverify.value)
2500
# New buffer for the fingerprint
2501
buf = ctypes.create_string_buffer(20)
2502
buf_len = ctypes.c_size_t()
2503
# Get the fingerprint from the certificate into the buffer
2504
gnutls.openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
2505
ctypes.byref(buf_len))
2506
# Deinit the certificate
2507
gnutls.openpgp_crt_deinit(crt)
2508
# Convert the buffer to a Python bytestring
2509
fpr = ctypes.string_at(buf, buf_len.value)
2510
# Convert the bytestring to hexadecimal notation
2511
hex_fpr = binascii.hexlify(fpr).upper()
2512
return hex_fpr
2513
2514
2515
class MultiprocessingMixIn:
2516
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
2517
2518
def sub_process_main(self, request, address):
2519
try:
2520
self.finish_request(request, address)
2521
except Exception:
2522
self.handle_error(request, address)
2523
self.close_request(request)
2524
2525
def process_request(self, request, address):
2526
"""Start a new process to process the request."""
2527
proc = multiprocessing.Process(target=self.sub_process_main,
2528
args=(request, address))
2529
proc.start()
2530
return proc
2531
2532
2533
class MultiprocessingMixInWithPipe(MultiprocessingMixIn):
2534
""" adds a pipe to the MixIn """
2535
2536
def process_request(self, request, client_address):
2537
"""Overrides and wraps the original process_request().
2538
2539
This function creates a new pipe in self.pipe
2540
"""
2541
parent_pipe, self.child_pipe = multiprocessing.Pipe()
2542
2543
proc = MultiprocessingMixIn.process_request(self, request,
2544
client_address)
2545
self.child_pipe.close()
2546
self.add_pipe(parent_pipe, proc)
2547
2548
def add_pipe(self, parent_pipe, proc):
2549
"""Dummy function; override as necessary"""
2550
raise NotImplementedError()
2551
2552
2553
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
2554
socketserver.TCPServer):
2555
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
2556
2557
Attributes:
2558
enabled: Boolean; whether this server is activated yet
2559
interface: None or a network interface name (string)
2560
use_ipv6: Boolean; to use IPv6 or not
2561
"""
2562
2563
def __init__(self, server_address, RequestHandlerClass,
2564
interface=None,
2565
use_ipv6=True,
2566
socketfd=None):
2567
"""If socketfd is set, use that file descriptor instead of
2568
creating a new one with socket.socket().
2569
"""
2570
self.interface = interface
2571
if use_ipv6:
2572
self.address_family = socket.AF_INET6
2573
if socketfd is not None:
2574
# Save the file descriptor
2575
self.socketfd = socketfd
2576
# Save the original socket.socket() function
2577
self.socket_socket = socket.socket
2578
2579
# To implement --socket, we monkey patch socket.socket.
2580
#
2581
# (When socketserver.TCPServer is a new-style class, we
2582
# could make self.socket into a property instead of monkey
2583
# patching socket.socket.)
2584
#
2585
# Create a one-time-only replacement for socket.socket()
2586
@functools.wraps(socket.socket)
2587
def socket_wrapper(*args, **kwargs):
2588
# Restore original function so subsequent calls are
2589
# not affected.
2590
socket.socket = self.socket_socket
2591
del self.socket_socket
2592
# This time only, return a new socket object from the
2593
# saved file descriptor.
2594
return socket.fromfd(self.socketfd, *args, **kwargs)
2595
# Replace socket.socket() function with wrapper
2596
socket.socket = socket_wrapper
2597
# The socketserver.TCPServer.__init__ will call
2598
# socket.socket(), which might be our replacement,
2599
# socket_wrapper(), if socketfd was set.
2600
socketserver.TCPServer.__init__(self, server_address,
2601
RequestHandlerClass)
2602
2603
def server_bind(self):
2604
"""This overrides the normal server_bind() function
2605
to bind to an interface if one was specified, and also NOT to
2606
bind to an address or port if they were not specified."""
2607
global SO_BINDTODEVICE
2608
if self.interface is not None:
2609
if SO_BINDTODEVICE is None:
2610
# Fall back to a hard-coded value which seems to be
2611
# common enough.
2612
logger.warning("SO_BINDTODEVICE not found, trying 25")
2613
SO_BINDTODEVICE = 25
2614
try:
2615
self.socket.setsockopt(
2616
socket.SOL_SOCKET, SO_BINDTODEVICE,
2617
(self.interface + "\0").encode("utf-8"))
2618
except socket.error as error:
2619
if error.errno == errno.EPERM:
2620
logger.error("No permission to bind to"
2621
" interface %s", self.interface)
2622
elif error.errno == errno.ENOPROTOOPT:
2623
logger.error("SO_BINDTODEVICE not available;"
2624
" cannot bind to interface %s",
2625
self.interface)
2626
elif error.errno == errno.ENODEV:
2627
logger.error("Interface %s does not exist,"
2628
" cannot bind", self.interface)
2629
else:
2630
raise
2631
# Only bind(2) the socket if we really need to.
2632
if self.server_address[0] or self.server_address[1]:
2633
if self.server_address[1]:
2634
self.allow_reuse_address = True
2635
if not self.server_address[0]:
2636
if self.address_family == socket.AF_INET6:
2637
any_address = "::" # in6addr_any
2638
else:
2639
any_address = "0.0.0.0" # INADDR_ANY
2640
self.server_address = (any_address,
2641
self.server_address[1])
2642
elif not self.server_address[1]:
2643
self.server_address = (self.server_address[0], 0)
2644
# if self.interface:
2645
# self.server_address = (self.server_address[0],
2646
# 0, # port
2647
# 0, # flowinfo
2648
# if_nametoindex
2649
# (self.interface))
2650
return socketserver.TCPServer.server_bind(self)
2651
2652
2653
class MandosServer(IPv6_TCPServer):
2654
"""Mandos server.
2655
2656
Attributes:
2657
clients: set of Client objects
2658
gnutls_priority GnuTLS priority string
2659
use_dbus: Boolean; to emit D-Bus signals or not
2660
2661
Assumes a GLib.MainLoop event loop.
2662
"""
2663
2664
def __init__(self, server_address, RequestHandlerClass,
2665
interface=None,
2666
use_ipv6=True,
2667
clients=None,
2668
gnutls_priority=None,
2669
use_dbus=True,
2670
socketfd=None):
2671
self.enabled = False
2672
self.clients = clients
2673
if self.clients is None:
2674
self.clients = {}
2675
self.use_dbus = use_dbus
2676
self.gnutls_priority = gnutls_priority
2677
IPv6_TCPServer.__init__(self, server_address,
2678
RequestHandlerClass,
2679
interface=interface,
2680
use_ipv6=use_ipv6,
2681
socketfd=socketfd)
2682
2683
def server_activate(self):
2684
if self.enabled:
2685
return socketserver.TCPServer.server_activate(self)
2686
2687
def enable(self):
2688
self.enabled = True
2689
2690
def add_pipe(self, parent_pipe, proc):
2691
# Call "handle_ipc" for both data and EOF events
2692
GLib.io_add_watch(
2693
GLib.IOChannel.unix_new(parent_pipe.fileno()),
2694
GLib.PRIORITY_DEFAULT, GLib.IO_IN | GLib.IO_HUP,
2695
functools.partial(self.handle_ipc,
2696
parent_pipe=parent_pipe,
2697
proc=proc))
2698
2699
def handle_ipc(self, source, condition,
2700
parent_pipe=None,
2701
proc=None,
2702
client_object=None):
2703
# error, or the other end of multiprocessing.Pipe has closed
2704
if condition & (GLib.IO_ERR | GLib.IO_HUP):
2705
# Wait for other process to exit
2706
proc.join()
2707
return False
2708
2709
# Read a request from the child
2710
request = parent_pipe.recv()
2711
command = request[0]
2712
2713
if command == 'init':
2714
key_id = request[1].decode("ascii")
2715
fpr = request[2].decode("ascii")
2716
address = request[3]
2717
2718
for c in self.clients.values():
2719
if key_id == "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855":
2720
continue
2721
if key_id and c.key_id == key_id:
2722
client = c
2723
break
2724
if fpr and c.fingerprint == fpr:
2725
client = c
2726
break
2727
else:
2728
logger.info("Client not found for key ID: %s, address"
2729
": %s", key_id or fpr, address)
2730
if self.use_dbus:
2731
# Emit D-Bus signal
2732
mandos_dbus_service.ClientNotFound(key_id or fpr,
2733
address[0])
2734
parent_pipe.send(False)
2735
return False
2736
2737
GLib.io_add_watch(
2738
GLib.IOChannel.unix_new(parent_pipe.fileno()),
2739
GLib.PRIORITY_DEFAULT, GLib.IO_IN | GLib.IO_HUP,
2740
functools.partial(self.handle_ipc,
2741
parent_pipe=parent_pipe,
2742
proc=proc,
2743
client_object=client))
2744
parent_pipe.send(True)
2745
# remove the old hook in favor of the new above hook on
2746
# same fileno
2747
return False
2748
if command == 'funcall':
2749
funcname = request[1]
2750
args = request[2]
2751
kwargs = request[3]
2752
2753
parent_pipe.send(('data', getattr(client_object,
2754
funcname)(*args,
2755
**kwargs)))
2756
2757
if command == 'getattr':
2758
attrname = request[1]
2759
if isinstance(client_object.__getattribute__(attrname),
2760
collections.abc.Callable):
2761
parent_pipe.send(('function', ))
2762
else:
2763
parent_pipe.send((
2764
'data', client_object.__getattribute__(attrname)))
2765
2766
if command == 'setattr':
2767
attrname = request[1]
2768
value = request[2]
2769
setattr(client_object, attrname, value)
2770
2771
return True
2772
2773
2774
def rfc3339_duration_to_delta(duration):
2775
"""Parse an RFC 3339 "duration" and return a datetime.timedelta
2776
2777
>>> rfc3339_duration_to_delta("P7D") == datetime.timedelta(7)
2778
True
2779
>>> rfc3339_duration_to_delta("PT60S") == datetime.timedelta(0, 60)
2780
True
2781
>>> rfc3339_duration_to_delta("PT60M") == datetime.timedelta(0, 3600)
2782
True
2783
>>> rfc3339_duration_to_delta("PT24H") == datetime.timedelta(1)
2784
True
2785
>>> rfc3339_duration_to_delta("P1W") == datetime.timedelta(7)
2786
True
2787
>>> rfc3339_duration_to_delta("PT5M30S") == datetime.timedelta(0, 330)
2788
True
2789
>>> rfc3339_duration_to_delta("P1DT3M20S") == datetime.timedelta(1, 200)
2790
True
2791
"""
2792
2793
# Parsing an RFC 3339 duration with regular expressions is not
2794
# possible - there would have to be multiple places for the same
2795
# values, like seconds. The current code, while more esoteric, is
2796
# cleaner without depending on a parsing library. If Python had a
2797
# built-in library for parsing we would use it, but we'd like to
2798
# avoid excessive use of external libraries.
2799
2800
# New type for defining tokens, syntax, and semantics all-in-one
2801
Token = collections.namedtuple("Token", (
2802
"regexp", # To match token; if "value" is not None, must have
2803
# a "group" containing digits
2804
"value", # datetime.timedelta or None
2805
"followers")) # Tokens valid after this token
2806
# RFC 3339 "duration" tokens, syntax, and semantics; taken from
2807
# the "duration" ABNF definition in RFC 3339, Appendix A.
2808
token_end = Token(re.compile(r"$"), None, frozenset())
2809
token_second = Token(re.compile(r"(\d+)S"),
2810
datetime.timedelta(seconds=1),
2811
frozenset((token_end, )))
2812
token_minute = Token(re.compile(r"(\d+)M"),
2813
datetime.timedelta(minutes=1),
2814
frozenset((token_second, token_end)))
2815
token_hour = Token(re.compile(r"(\d+)H"),
2816
datetime.timedelta(hours=1),
2817
frozenset((token_minute, token_end)))
2818
token_time = Token(re.compile(r"T"),
2819
None,
2820
frozenset((token_hour, token_minute,
2821
token_second)))
2822
token_day = Token(re.compile(r"(\d+)D"),
2823
datetime.timedelta(days=1),
2824
frozenset((token_time, token_end)))
2825
token_month = Token(re.compile(r"(\d+)M"),
2826
datetime.timedelta(weeks=4),
2827
frozenset((token_day, token_end)))
2828
token_year = Token(re.compile(r"(\d+)Y"),
2829
datetime.timedelta(weeks=52),
2830
frozenset((token_month, token_end)))
2831
token_week = Token(re.compile(r"(\d+)W"),
2832
datetime.timedelta(weeks=1),
2833
frozenset((token_end, )))
2834
token_duration = Token(re.compile(r"P"), None,
2835
frozenset((token_year, token_month,
2836
token_day, token_time,
2837
token_week)))
2838
# Define starting values:
2839
# Value so far
2840
value = datetime.timedelta()
2841
found_token = None
2842
# Following valid tokens
2843
followers = frozenset((token_duration, ))
2844
# String left to parse
2845
s = duration
2846
# Loop until end token is found
2847
while found_token is not token_end:
2848
# Search for any currently valid tokens
2849
for token in followers:
2850
match = token.regexp.match(s)
2851
if match is not None:
2852
# Token found
2853
if token.value is not None:
2854
# Value found, parse digits
2855
factor = int(match.group(1), 10)
2856
# Add to value so far
2857
value += factor * token.value
2858
# Strip token from string
2859
s = token.regexp.sub("", s, 1)
2860
# Go to found token
2861
found_token = token
2862
# Set valid next tokens
2863
followers = found_token.followers
2864
break
2865
else:
2866
# No currently valid tokens were found
2867
raise ValueError("Invalid RFC 3339 duration: {!r}"
2868
.format(duration))
2869
# End token found
2870
return value
89
return self.checker.stdout.fileno()
90
def next_stop(self):
91
"""The time when something must be done about this client
92
May be in the past."""
93
if self.last_seen is None:
94
# This client has never been seen
95
next_timeout = self.created + self.timeout
96
else:
97
next_timeout = self.last_seen + self.timeout
98
if self.checker is None:
99
return min(next_timeout, self.next_check)
100
else:
101
return next_timeout
102
def still_valid(self, now=None):
103
"""Has this client's timeout not passed?"""
104
if now is None:
105
now = datetime.datetime.now()
106
if self.last_seen is None:
107
return now < (self.created + self.timeout)
108
else:
109
return now < (self.last_seen + self.timeout)
110
def it_is_time_to_check(self, now=None):
111
if now is None:
112
now = datetime.datetime.now()
113
return self.next_check <= now
114
115
116
class server_metaclass(type):
117
"Common behavior for the UDP and TCP server classes"
118
def __new__(cls, name, bases, attrs):
119
attrs["address_family"] = socket.AF_INET6
120
attrs["allow_reuse_address"] = True
121
def server_bind(self):
122
if self.options.interface:
123
if not hasattr(socket, "SO_BINDTODEVICE"):
124
# From /usr/include/asm-i486/socket.h
125
socket.SO_BINDTODEVICE = 25
126
try:
127
self.socket.setsockopt(socket.SOL_SOCKET,
128
socket.SO_BINDTODEVICE,
129
self.options.interface)
130
except socket.error, error:
131
if error[0] == errno.EPERM:
132
print "Warning: No permission to bind to interface", \
133
self.options.interface
134
else:
135
raise error
136
return super(type(self), self).server_bind()
137
attrs["server_bind"] = server_bind
138
def init(self, *args, **kwargs):
139
if "options" in kwargs:
140
self.options = kwargs["options"]
141
del kwargs["options"]
142
if "clients" in kwargs:
143
self.clients = kwargs["clients"]
144
del kwargs["clients"]
145
if "credentials" in kwargs:
146
self.credentials = kwargs["credentials"]
147
del kwargs["credentials"]
148
return super(type(self), self).__init__(*args, **kwargs)
149
attrs["__init__"] = init
150
return type.__new__(cls, name, bases, attrs)
151
152
153
class udp_handler(SocketServer.DatagramRequestHandler, object):
154
def handle(self):
155
self.wfile.write("Polo")
156
print "UDP request answered"
157
158
159
class IPv6_UDPServer(SocketServer.UDPServer, object):
160
__metaclass__ = server_metaclass
161
def verify_request(self, request, client_address):
162
print "UDP request came"
163
return request[0] == "Marco"
164
165
166
class tcp_handler(SocketServer.BaseRequestHandler, object):
167
def handle(self):
168
print "TCP request came"
169
print "Request:", self.request
170
print "Client Address:", self.client_address
171
print "Server:", self.server
172
session = gnutls.connection.ServerSession(self.request,
173
self.server.credentials)
174
session.handshake()
175
if session.peer_certificate:
176
print "DN:", session.peer_certificate.subject
177
try:
178
session.verify_peer()
179
except gnutls.errors.CertificateError, error:
180
print "Verify failed", error
181
session.bye()
182
return
183
try:
184
session.send([client.password
185
for client in self.server.clients
186
if (client.dn ==
187
session.peer_certificate.subject)][0])
188
except IndexError:
189
session.send("gazonk")
190
# Log maybe? XXX
191
session.bye()
192
193
194
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
195
__metaclass__ = server_metaclass
2871
196
2872
197
2873
198
def string_to_delta(interval):
2874
199
"""Parse a string and return a datetime.timedelta
2875
200
2876
>>> string_to_delta('7d') == datetime.timedelta(7)
2877
True
2878
>>> string_to_delta('60s') == datetime.timedelta(0, 60)
2879
True
2880
>>> string_to_delta('60m') == datetime.timedelta(0, 3600)
2881
True
2882
>>> string_to_delta('24h') == datetime.timedelta(1)
2883
True
2884
>>> string_to_delta('1w') == datetime.timedelta(7)
2885
True
2886
>>> string_to_delta('5m 30s') == datetime.timedelta(0, 330)
2887
True
201
>>> string_to_delta('7d')
202
datetime.timedelta(7)
203
>>> string_to_delta('60s')
204
datetime.timedelta(0, 60)
205
>>> string_to_delta('60m')
206
datetime.timedelta(0, 3600)
207
>>> string_to_delta('24h')
208
datetime.timedelta(1)
209
>>> string_to_delta(u'1w')
210
datetime.timedelta(7)
2888
211
"""
2889
2890
212
try:
2891
return rfc3339_duration_to_delta(interval)
2892
except ValueError:
2893
pass
2894
2895
timevalue = datetime.timedelta(0)
2896
for s in interval.split():
2897
try:
2898
suffix = s[-1]
2899
value = int(s[:-1])
2900
if suffix == "d":
2901
delta = datetime.timedelta(value)
2902
elif suffix == "s":
2903
delta = datetime.timedelta(0, value)
2904
elif suffix == "m":
2905
delta = datetime.timedelta(0, 0, 0, 0, value)
2906
elif suffix == "h":
2907
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2908
elif suffix == "w":
2909
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2910
else:
2911
raise ValueError("Unknown suffix {!r}".format(suffix))
2912
except IndexError as e:
2913
raise ValueError(*(e.args))
2914
timevalue += delta
2915
return timevalue
2916
2917
2918
def daemon(nochdir=False, noclose=False):
2919
"""See daemon(3). Standard BSD Unix function.
2920
2921
This should really exist as os.daemon, but it doesn't (yet)."""
2922
if os.fork():
2923
sys.exit()
2924
os.setsid()
2925
if not nochdir:
2926
os.chdir("/")
2927
if os.fork():
2928
sys.exit()
2929
if not noclose:
2930
# Close all standard open file descriptors
2931
null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2932
if not stat.S_ISCHR(os.fstat(null).st_mode):
2933
raise OSError(errno.ENODEV,
2934
"{} not a character device"
2935
.format(os.devnull))
2936
os.dup2(null, sys.stdin.fileno())
2937
os.dup2(null, sys.stdout.fileno())
2938
os.dup2(null, sys.stderr.fileno())
2939
if null > 2:
2940
os.close(null)
213
suffix=unicode(interval[-1])
214
value=int(interval[:-1])
215
if suffix == u"d":
216
delta = datetime.timedelta(value)
217
elif suffix == u"s":
218
delta = datetime.timedelta(0, value)
219
elif suffix == u"m":
220
delta = datetime.timedelta(0, 0, 0, 0, value)
221
elif suffix == u"h":
222
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
223
elif suffix == u"w":
224
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
225
else:
226
raise ValueError
227
except (ValueError, IndexError):
228
raise ValueError
229
return delta
2941
230
2942
231
2943
232
def main():
2944
2945
##################################################################
2946
# Parsing of options, both command line and config file
2947
2948
parser = argparse.ArgumentParser()
2949
parser.add_argument("-v", "--version", action="version",
2950
version="%(prog)s {}".format(version),
2951
help="show version number and exit")
2952
parser.add_argument("-i", "--interface", metavar="IF",
2953
help="Bind to interface IF")
2954
parser.add_argument("-a", "--address",
2955
help="Address to listen for requests on")
2956
parser.add_argument("-p", "--port", type=int,
2957
help="Port number to receive requests on")
2958
parser.add_argument("--check", action="store_true",
2959
help="Run self-test")
2960
parser.add_argument("--debug", action="store_true",
2961
help="Debug mode; run in foreground and log"
2962
" to terminal", default=None)
2963
parser.add_argument("--debuglevel", metavar="LEVEL",
2964
help="Debug level for stdout output")
2965
parser.add_argument("--priority", help="GnuTLS"
2966
" priority string (see GnuTLS documentation)")
2967
parser.add_argument("--servicename",
2968
metavar="NAME", help="Zeroconf service name")
2969
parser.add_argument("--configdir",
2970
default="/etc/mandos", metavar="DIR",
2971
help="Directory to search for configuration"
2972
" files")
2973
parser.add_argument("--no-dbus", action="store_false",
2974
dest="use_dbus", help="Do not provide D-Bus"
2975
" system bus interface", default=None)
2976
parser.add_argument("--no-ipv6", action="store_false",
2977
dest="use_ipv6", help="Do not use IPv6",
2978
default=None)
2979
parser.add_argument("--no-restore", action="store_false",
2980
dest="restore", help="Do not restore stored"
2981
" state", default=None)
2982
parser.add_argument("--socket", type=int,
2983
help="Specify a file descriptor to a network"
2984
" socket to use instead of creating one")
2985
parser.add_argument("--statedir", metavar="DIR",
2986
help="Directory to save/restore state in")
2987
parser.add_argument("--foreground", action="store_true",
2988
help="Run in foreground", default=None)
2989
parser.add_argument("--no-zeroconf", action="store_false",
2990
dest="zeroconf", help="Do not use Zeroconf",
2991
default=None)
2992
2993
options = parser.parse_args()
2994
2995
# Default values for config file for server-global settings
2996
if gnutls.has_rawpk:
2997
priority = ("SECURE128:!CTYPE-X.509:+CTYPE-RAWPK:!RSA"
2998
":!VERS-ALL:+VERS-TLS1.3:%PROFILE_ULTRA")
2999
else:
3000
priority = ("SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:!RSA"
3001
":+SIGN-DSA-SHA256")
3002
server_defaults = {"interface": "",
3003
"address": "",
3004
"port": "",
3005
"debug": "False",
3006
"priority": priority,
3007
"servicename": "Mandos",
3008
"use_dbus": "True",
3009
"use_ipv6": "True",
3010
"debuglevel": "",
3011
"restore": "True",
3012
"socket": "",
3013
"statedir": "/var/lib/mandos",
3014
"foreground": "False",
3015
"zeroconf": "True",
3016
}
3017
del priority
3018
3019
# Parse config file for server-global settings
3020
server_config = configparser.ConfigParser(server_defaults)
3021
del server_defaults
3022
server_config.read(os.path.join(options.configdir, "mandos.conf"))
3023
# Convert the ConfigParser object to a dict
3024
server_settings = server_config.defaults()
3025
# Use the appropriate methods on the non-string config options
3026
for option in ("debug", "use_dbus", "use_ipv6", "restore",
3027
"foreground", "zeroconf"):
3028
server_settings[option] = server_config.getboolean("DEFAULT",
3029
option)
3030
if server_settings["port"]:
3031
server_settings["port"] = server_config.getint("DEFAULT",
3032
"port")
3033
if server_settings["socket"]:
3034
server_settings["socket"] = server_config.getint("DEFAULT",
3035
"socket")
3036
# Later, stdin will, and stdout and stderr might, be dup'ed
3037
# over with an opened os.devnull. But we don't want this to
3038
# happen with a supplied network socket.
3039
if 0 <= server_settings["socket"] <= 2:
3040
server_settings["socket"] = os.dup(server_settings
3041
["socket"])
3042
del server_config
3043
3044
# Override the settings from the config file with command line
3045
# options, if set.
3046
for option in ("interface", "address", "port", "debug",
3047
"priority", "servicename", "configdir", "use_dbus",
3048
"use_ipv6", "debuglevel", "restore", "statedir",
3049
"socket", "foreground", "zeroconf"):
3050
value = getattr(options, option)
3051
if value is not None:
3052
server_settings[option] = value
3053
del options
3054
# Force all strings to be unicode
3055
for option in server_settings.keys():
3056
if isinstance(server_settings[option], bytes):
3057
server_settings[option] = (server_settings[option]
3058
.decode("utf-8"))
3059
# Force all boolean options to be boolean
3060
for option in ("debug", "use_dbus", "use_ipv6", "restore",
3061
"foreground", "zeroconf"):
3062
server_settings[option] = bool(server_settings[option])
3063
# Debug implies foreground
3064
if server_settings["debug"]:
3065
server_settings["foreground"] = True
3066
# Now we have our good server settings in "server_settings"
3067
3068
##################################################################
3069
3070
if (not server_settings["zeroconf"]
3071
and not (server_settings["port"]
3072
or server_settings["socket"] != "")):
3073
parser.error("Needs port or socket to work without Zeroconf")
3074
3075
# For convenience
3076
debug = server_settings["debug"]
3077
debuglevel = server_settings["debuglevel"]
3078
use_dbus = server_settings["use_dbus"]
3079
use_ipv6 = server_settings["use_ipv6"]
3080
stored_state_path = os.path.join(server_settings["statedir"],
3081
stored_state_file)
3082
foreground = server_settings["foreground"]
3083
zeroconf = server_settings["zeroconf"]
3084
3085
if debug:
3086
initlogger(debug, logging.DEBUG)
3087
else:
3088
if not debuglevel:
3089
initlogger(debug)
3090
else:
3091
level = getattr(logging, debuglevel.upper())
3092
initlogger(debug, level)
3093
3094
if server_settings["servicename"] != "Mandos":
3095
syslogger.setFormatter(
3096
logging.Formatter('Mandos ({}) [%(process)d]:'
3097
' %(levelname)s: %(message)s'.format(
3098
server_settings["servicename"])))
3099
3100
# Parse config file with clients
3101
client_config = configparser.ConfigParser(Client.client_defaults)
3102
client_config.read(os.path.join(server_settings["configdir"],
3103
"clients.conf"))
3104
3105
global mandos_dbus_service
3106
mandos_dbus_service = None
3107
3108
socketfd = None
3109
if server_settings["socket"] != "":
3110
socketfd = server_settings["socket"]
3111
tcp_server = MandosServer(
3112
(server_settings["address"], server_settings["port"]),
3113
ClientHandler,
3114
interface=(server_settings["interface"] or None),
3115
use_ipv6=use_ipv6,
3116
gnutls_priority=server_settings["priority"],
3117
use_dbus=use_dbus,
3118
socketfd=socketfd)
3119
if not foreground:
3120
pidfilename = "/run/mandos.pid"
3121
if not os.path.isdir("/run/."):
3122
pidfilename = "/var/run/mandos.pid"
3123
pidfile = None
3124
try:
3125
pidfile = codecs.open(pidfilename, "w", encoding="utf-8")
3126
except IOError as e:
3127
logger.error("Could not open file %r", pidfilename,
3128
exc_info=e)
3129
3130
for name, group in (("_mandos", "_mandos"),
3131
("mandos", "mandos"),
3132
("nobody", "nogroup")):
3133
try:
3134
uid = pwd.getpwnam(name).pw_uid
3135
gid = pwd.getpwnam(group).pw_gid
3136
break
3137
except KeyError:
3138
continue
3139
else:
3140
uid = 65534
3141
gid = 65534
3142
try:
3143
os.setgid(gid)
3144
os.setuid(uid)
3145
if debug:
3146
logger.debug("Did setuid/setgid to {}:{}".format(uid,
3147
gid))
3148
except OSError as error:
3149
logger.warning("Failed to setuid/setgid to {}:{}: {}"
3150
.format(uid, gid, os.strerror(error.errno)))
3151
if error.errno != errno.EPERM:
3152
raise
3153
3154
if debug:
3155
# Enable all possible GnuTLS debugging
3156
3157
# "Use a log level over 10 to enable all debugging options."
3158
# - GnuTLS manual
3159
gnutls.global_set_log_level(11)
3160
3161
@gnutls.log_func
3162
def debug_gnutls(level, string):
3163
logger.debug("GnuTLS: %s", string[:-1])
3164
3165
gnutls.global_set_log_function(debug_gnutls)
3166
3167
# Redirect stdin so all checkers get /dev/null
3168
null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
3169
os.dup2(null, sys.stdin.fileno())
3170
if null > 2:
3171
os.close(null)
3172
3173
# Need to fork before connecting to D-Bus
3174
if not foreground:
3175
# Close all input and output, do double fork, etc.
3176
daemon()
3177
3178
if gi.version_info < (3, 10, 2):
3179
# multiprocessing will use threads, so before we use GLib we
3180
# need to inform GLib that threads will be used.
3181
GLib.threads_init()
3182
3183
global main_loop
3184
# From the Avahi example code
3185
DBusGMainLoop(set_as_default=True)
3186
main_loop = GLib.MainLoop()
3187
bus = dbus.SystemBus()
3188
# End of Avahi example code
3189
if use_dbus:
3190
try:
3191
bus_name = dbus.service.BusName("se.recompile.Mandos",
3192
bus,
3193
do_not_queue=True)
3194
old_bus_name = dbus.service.BusName(
3195
"se.bsnet.fukt.Mandos", bus,
3196
do_not_queue=True)
3197
except dbus.exceptions.DBusException as e:
3198
logger.error("Disabling D-Bus:", exc_info=e)
3199
use_dbus = False
3200
server_settings["use_dbus"] = False
3201
tcp_server.use_dbus = False
3202
if zeroconf:
3203
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
3204
service = AvahiServiceToSyslog(
3205
name=server_settings["servicename"],
3206
servicetype="_mandos._tcp",
3207
protocol=protocol,
3208
bus=bus)
3209
if server_settings["interface"]:
3210
service.interface = if_nametoindex(
3211
server_settings["interface"].encode("utf-8"))
3212
3213
global multiprocessing_manager
3214
multiprocessing_manager = multiprocessing.Manager()
3215
3216
client_class = Client
3217
if use_dbus:
3218
client_class = functools.partial(ClientDBus, bus=bus)
3219
3220
client_settings = Client.config_parser(client_config)
3221
old_client_settings = {}
3222
clients_data = {}
3223
3224
# This is used to redirect stdout and stderr for checker processes
3225
global wnull
3226
wnull = open(os.devnull, "w") # A writable /dev/null
3227
# Only used if server is running in foreground but not in debug
3228
# mode
3229
if debug or not foreground:
3230
wnull.close()
3231
3232
# Get client data and settings from last running state.
3233
if server_settings["restore"]:
3234
try:
3235
with open(stored_state_path, "rb") as stored_state:
3236
if sys.version_info.major == 2:
3237
clients_data, old_client_settings = pickle.load(
3238
stored_state)
3239
else:
3240
bytes_clients_data, bytes_old_client_settings = (
3241
pickle.load(stored_state, encoding="bytes"))
3242
# Fix bytes to strings
3243
# clients_data
3244
# .keys()
3245
clients_data = {(key.decode("utf-8")
3246
if isinstance(key, bytes)
3247
else key): value
3248
for key, value in
3249
bytes_clients_data.items()}
3250
del bytes_clients_data
3251
for key in clients_data:
3252
value = {(k.decode("utf-8")
3253
if isinstance(k, bytes) else k): v
3254
for k, v in
3255
clients_data[key].items()}
3256
clients_data[key] = value
3257
# .client_structure
3258
value["client_structure"] = [
3259
(s.decode("utf-8")
3260
if isinstance(s, bytes)
3261
else s) for s in
3262
value["client_structure"]]
3263
# .name, .host, and .checker_command
3264
for k in ("name", "host", "checker_command"):
3265
if isinstance(value[k], bytes):
3266
value[k] = value[k].decode("utf-8")
3267
if "key_id" not in value:
3268
value["key_id"] = ""
3269
elif "fingerprint" not in value:
3270
value["fingerprint"] = ""
3271
# old_client_settings
3272
# .keys()
3273
old_client_settings = {
3274
(key.decode("utf-8")
3275
if isinstance(key, bytes)
3276
else key): value
3277
for key, value in
3278
bytes_old_client_settings.items()}
3279
del bytes_old_client_settings
3280
# .host and .checker_command
3281
for value in old_client_settings.values():
3282
for attribute in ("host", "checker_command"):
3283
if isinstance(value[attribute], bytes):
3284
value[attribute] = (value[attribute]
3285
.decode("utf-8"))
3286
os.remove(stored_state_path)
3287
except IOError as e:
3288
if e.errno == errno.ENOENT:
3289
logger.warning("Could not load persistent state:"
3290
" {}".format(os.strerror(e.errno)))
3291
else:
3292
logger.critical("Could not load persistent state:",
3293
exc_info=e)
3294
raise
3295
except EOFError as e:
3296
logger.warning("Could not load persistent state: "
3297
"EOFError:",
3298
exc_info=e)
3299
3300
with PGPEngine() as pgp:
3301
for client_name, client in clients_data.items():
3302
# Skip removed clients
3303
if client_name not in client_settings:
3304
continue
3305
3306
# Decide which value to use after restoring saved state.
3307
# We have three different values: Old config file,
3308
# new config file, and saved state.
3309
# New config value takes precedence if it differs from old
3310
# config value, otherwise use saved state.
3311
for name, value in client_settings[client_name].items():
3312
try:
3313
# For each value in new config, check if it
3314
# differs from the old config value (Except for
3315
# the "secret" attribute)
3316
if (name != "secret"
3317
and (value !=
3318
old_client_settings[client_name][name])):
3319
client[name] = value
3320
except KeyError:
3321
pass
3322
3323
# Clients who has passed its expire date can still be
3324
# enabled if its last checker was successful. A Client
3325
# whose checker succeeded before we stored its state is
3326
# assumed to have successfully run all checkers during
3327
# downtime.
3328
if client["enabled"]:
3329
if datetime.datetime.utcnow() >= client["expires"]:
3330
if not client["last_checked_ok"]:
3331
logger.warning(
3332
"disabling client {} - Client never "
3333
"performed a successful checker".format(
3334
client_name))
3335
client["enabled"] = False
3336
elif client["last_checker_status"] != 0:
3337
logger.warning(
3338
"disabling client {} - Client last"
3339
" checker failed with error code"
3340
" {}".format(
3341
client_name,
3342
client["last_checker_status"]))
3343
client["enabled"] = False
3344
else:
3345
client["expires"] = (
3346
datetime.datetime.utcnow()
3347
+ client["timeout"])
3348
logger.debug("Last checker succeeded,"
3349
" keeping {} enabled".format(
3350
client_name))
3351
try:
3352
client["secret"] = pgp.decrypt(
3353
client["encrypted_secret"],
3354
client_settings[client_name]["secret"])
3355
except PGPError:
3356
# If decryption fails, we use secret from new settings
3357
logger.debug("Failed to decrypt {} old secret".format(
3358
client_name))
3359
client["secret"] = (client_settings[client_name]
3360
["secret"])
3361
3362
# Add/remove clients based on new changes made to config
3363
for client_name in (set(old_client_settings)
3364
- set(client_settings)):
3365
del clients_data[client_name]
3366
for client_name in (set(client_settings)
3367
- set(old_client_settings)):
3368
clients_data[client_name] = client_settings[client_name]
3369
3370
# Create all client objects
3371
for client_name, client in clients_data.items():
3372
tcp_server.clients[client_name] = client_class(
3373
name=client_name,
3374
settings=client,
3375
server_settings=server_settings)
3376
3377
if not tcp_server.clients:
3378
logger.warning("No clients defined")
3379
3380
if not foreground:
3381
if pidfile is not None:
3382
pid = os.getpid()
3383
try:
3384
with pidfile:
3385
print(pid, file=pidfile)
3386
except IOError:
3387
logger.error("Could not write to file %r with PID %d",
3388
pidfilename, pid)
3389
del pidfile
3390
del pidfilename
3391
3392
for termsig in (signal.SIGHUP, signal.SIGTERM):
3393
GLib.unix_signal_add(GLib.PRIORITY_HIGH, termsig,
3394
lambda: main_loop.quit() and False)
3395
3396
if use_dbus:
3397
3398
@alternate_dbus_interfaces(
3399
{"se.recompile.Mandos": "se.bsnet.fukt.Mandos"})
3400
class MandosDBusService(DBusObjectWithObjectManager):
3401
"""A D-Bus proxy object"""
3402
3403
def __init__(self):
3404
dbus.service.Object.__init__(self, bus, "/")
3405
3406
_interface = "se.recompile.Mandos"
3407
3408
@dbus.service.signal(_interface, signature="o")
3409
def ClientAdded(self, objpath):
3410
"D-Bus signal"
3411
pass
3412
3413
@dbus.service.signal(_interface, signature="ss")
3414
def ClientNotFound(self, key_id, address):
3415
"D-Bus signal"
3416
pass
3417
3418
@dbus_annotations({"org.freedesktop.DBus.Deprecated":
3419
"true"})
3420
@dbus.service.signal(_interface, signature="os")
3421
def ClientRemoved(self, objpath, name):
3422
"D-Bus signal"
3423
pass
3424
3425
@dbus_annotations({"org.freedesktop.DBus.Deprecated":
3426
"true"})
3427
@dbus.service.method(_interface, out_signature="ao")
3428
def GetAllClients(self):
3429
"D-Bus method"
3430
return dbus.Array(c.dbus_object_path for c in
3431
tcp_server.clients.values())
3432
3433
@dbus_annotations({"org.freedesktop.DBus.Deprecated":
3434
"true"})
3435
@dbus.service.method(_interface,
3436
out_signature="a{oa{sv}}")
3437
def GetAllClientsWithProperties(self):
3438
"D-Bus method"
3439
return dbus.Dictionary(
3440
{c.dbus_object_path: c.GetAll(
3441
"se.recompile.Mandos.Client")
3442
for c in tcp_server.clients.values()},
3443
signature="oa{sv}")
3444
3445
@dbus.service.method(_interface, in_signature="o")
3446
def RemoveClient(self, object_path):
3447
"D-Bus method"
3448
for c in tcp_server.clients.values():
3449
if c.dbus_object_path == object_path:
3450
del tcp_server.clients[c.name]
3451
c.remove_from_connection()
3452
# Don't signal the disabling
3453
c.disable(quiet=True)
3454
# Emit D-Bus signal for removal
3455
self.client_removed_signal(c)
3456
return
3457
raise KeyError(object_path)
3458
3459
del _interface
3460
3461
@dbus.service.method(dbus.OBJECT_MANAGER_IFACE,
3462
out_signature="a{oa{sa{sv}}}")
3463
def GetManagedObjects(self):
3464
"""D-Bus method"""
3465
return dbus.Dictionary(
3466
{client.dbus_object_path:
3467
dbus.Dictionary(
3468
{interface: client.GetAll(interface)
3469
for interface in
3470
client._get_all_interface_names()})
3471
for client in tcp_server.clients.values()})
3472
3473
def client_added_signal(self, client):
3474
"""Send the new standard signal and the old signal"""
3475
if use_dbus:
3476
# New standard signal
3477
self.InterfacesAdded(
3478
client.dbus_object_path,
3479
dbus.Dictionary(
3480
{interface: client.GetAll(interface)
3481
for interface in
3482
client._get_all_interface_names()}))
3483
# Old signal
3484
self.ClientAdded(client.dbus_object_path)
3485
3486
def client_removed_signal(self, client):
3487
"""Send the new standard signal and the old signal"""
3488
if use_dbus:
3489
# New standard signal
3490
self.InterfacesRemoved(
3491
client.dbus_object_path,
3492
client._get_all_interface_names())
3493
# Old signal
3494
self.ClientRemoved(client.dbus_object_path,
3495
client.name)
3496
3497
mandos_dbus_service = MandosDBusService()
3498
3499
# Save modules to variables to exempt the modules from being
3500
# unloaded before the function registered with atexit() is run.
3501
mp = multiprocessing
3502
wn = wnull
3503
3504
def cleanup():
3505
"Cleanup function; run on exit"
3506
if zeroconf:
3507
service.cleanup()
3508
3509
mp.active_children()
3510
wn.close()
3511
if not (tcp_server.clients or client_settings):
3512
return
3513
3514
# Store client before exiting. Secrets are encrypted with key
3515
# based on what config file has. If config file is
3516
# removed/edited, old secret will thus be unrecovable.
3517
clients = {}
3518
with PGPEngine() as pgp:
3519
for client in tcp_server.clients.values():
3520
key = client_settings[client.name]["secret"]
3521
client.encrypted_secret = pgp.encrypt(client.secret,
3522
key)
3523
client_dict = {}
3524
3525
# A list of attributes that can not be pickled
3526
# + secret.
3527
exclude = {"bus", "changedstate", "secret",
3528
"checker", "server_settings"}
3529
for name, typ in inspect.getmembers(dbus.service
3530
.Object):
3531
exclude.add(name)
3532
3533
client_dict["encrypted_secret"] = (client
3534
.encrypted_secret)
3535
for attr in client.client_structure:
3536
if attr not in exclude:
3537
client_dict[attr] = getattr(client, attr)
3538
3539
clients[client.name] = client_dict
3540
del client_settings[client.name]["secret"]
3541
3542
try:
3543
with tempfile.NamedTemporaryFile(
3544
mode='wb',
3545
suffix=".pickle",
3546
prefix='clients-',
3547
dir=os.path.dirname(stored_state_path),
3548
delete=False) as stored_state:
3549
pickle.dump((clients, client_settings), stored_state,
3550
protocol=2)
3551
tempname = stored_state.name
3552
os.rename(tempname, stored_state_path)
3553
except (IOError, OSError) as e:
3554
if not debug:
3555
try:
3556
os.remove(tempname)
3557
except NameError:
3558
pass
3559
if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
3560
logger.warning("Could not save persistent state: {}"
3561
.format(os.strerror(e.errno)))
3562
else:
3563
logger.warning("Could not save persistent state:",
3564
exc_info=e)
3565
raise
3566
3567
# Delete all clients, and settings from config
3568
while tcp_server.clients:
3569
name, client = tcp_server.clients.popitem()
3570
if use_dbus:
3571
client.remove_from_connection()
3572
# Don't signal the disabling
3573
client.disable(quiet=True)
3574
# Emit D-Bus signal for removal
3575
if use_dbus:
3576
mandos_dbus_service.client_removed_signal(client)
3577
client_settings.clear()
3578
3579
atexit.register(cleanup)
3580
3581
for client in tcp_server.clients.values():
3582
if use_dbus:
3583
# Emit D-Bus signal for adding
3584
mandos_dbus_service.client_added_signal(client)
3585
# Need to initiate checking of clients
3586
if client.enabled:
3587
client.init_checker()
3588
3589
tcp_server.enable()
3590
tcp_server.server_activate()
3591
3592
# Find out what port we got
3593
if zeroconf:
3594
service.port = tcp_server.socket.getsockname()[1]
3595
if use_ipv6:
3596
logger.info("Now listening on address %r, port %d,"
3597
" flowinfo %d, scope_id %d",
3598
*tcp_server.socket.getsockname())
3599
else: # IPv4
3600
logger.info("Now listening on address %r, port %d",
3601
*tcp_server.socket.getsockname())
3602
3603
# service.interface = tcp_server.socket.getsockname()[3]
3604
3605
try:
3606
if zeroconf:
3607
# From the Avahi example code
3608
try:
3609
service.activate()
3610
except dbus.exceptions.DBusException as error:
3611
logger.critical("D-Bus Exception", exc_info=error)
3612
cleanup()
3613
sys.exit(1)
3614
# End of Avahi example code
3615
3616
GLib.io_add_watch(
3617
GLib.IOChannel.unix_new(tcp_server.fileno()),
3618
GLib.PRIORITY_DEFAULT, GLib.IO_IN,
3619
lambda *args, **kwargs: (tcp_server.handle_request
3620
(*args[2:], **kwargs) or True))
3621
3622
logger.debug("Starting main loop")
3623
main_loop.run()
3624
except AvahiError as error:
3625
logger.critical("Avahi Error", exc_info=error)
3626
cleanup()
3627
sys.exit(1)
3628
except KeyboardInterrupt:
3629
if debug:
3630
print("", file=sys.stderr)
3631
logger.debug("Server received KeyboardInterrupt")
3632
logger.debug("Server exiting")
3633
# Must run before the D-Bus bus name gets deregistered
3634
cleanup()
3635
3636
3637
def should_only_run_tests():
3638
parser = argparse.ArgumentParser(add_help=False)
3639
parser.add_argument("--check", action='store_true')
3640
args, unknown_args = parser.parse_known_args()
3641
run_tests = args.check
3642
if run_tests:
3643
# Remove --check argument from sys.argv
3644
sys.argv[1:] = unknown_args
3645
return run_tests
3646
3647
# Add all tests from doctest strings
3648
def load_tests(loader, tests, none):
3649
import doctest
3650
tests.addTests(doctest.DocTestSuite())
3651
return tests
3652
3653
if __name__ == '__main__':
3654
try:
3655
if should_only_run_tests():
3656
# Call using ./mandos --check [--verbose]
3657
unittest.main()
3658
else:
3659
main()
3660
finally:
3661
logging.shutdown()
233
parser = OptionParser()
234
parser.add_option("-i", "--interface", type="string",
235
default="eth0", metavar="IF",
236
help="Interface to bind to")
237
parser.add_option("--cert", type="string", default="cert.pem",
238
metavar="FILE",
239
help="Public key certificate to use")
240
parser.add_option("--key", type="string", default="key.pem",
241
metavar="FILE",
242
help="Private key to use")
243
parser.add_option("--ca", type="string", default="ca.pem",
244
metavar="FILE",
245
help="Certificate Authority certificate to use")
246
parser.add_option("--crl", type="string", default="crl.pem",
247
metavar="FILE",
248
help="Certificate Revokation List to use")
249
parser.add_option("-p", "--port", type="int", default=49001,
250
help="Port number to receive requests on")
251
parser.add_option("--dh", type="int", metavar="BITS",
252
help="DH group to use")
253
parser.add_option("-t", "--timeout", type="string", # Parsed later
254
default="15m",
255
help="Amount of downtime allowed for clients")
256
parser.add_option("--interval", type="string", # Parsed later
257
default="5m",
258
help="How often to check that a client is up")
259
parser.add_option("--check", action="store_true", default=False,
260
help="Run self-test")
261
(options, args) = parser.parse_args()
262
263
if options.check:
264
import doctest
265
doctest.testmod()
266
sys.exit()
267
268
# Parse the time arguments
269
try:
270
options.timeout = string_to_delta(options.timeout)
271
except ValueError:
272
parser.error("option --timeout: Unparseable time")
273
274
try:
275
options.interval = string_to_delta(options.interval)
276
except ValueError:
277
parser.error("option --interval: Unparseable time")
278
279
cert = gnutls.crypto.X509Certificate(open(options.cert).read())
280
key = gnutls.crypto.X509PrivateKey(open(options.key).read())
281
ca = gnutls.crypto.X509Certificate(open(options.ca).read())
282
crl = gnutls.crypto.X509CRL(open(options.crl).read())
283
cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
284
285
# Parse config file
286
defaults = {}
287
client_config_object = ConfigParser.SafeConfigParser(defaults)
288
client_config_object.read("mandos-clients.conf")
289
clients = Set(Client(name=section, options=options,
290
**(dict(client_config_object\
291
.items(section))))
292
for section in client_config_object.sections())
293
294
in6addr_any = "::"
295
udp_server = IPv6_UDPServer((in6addr_any, options.port),
296
udp_handler,
297
options=options)
298
299
tcp_server = IPv6_TCPServer((in6addr_any, options.port),
300
tcp_handler,
301
options=options,
302
clients=clients,
303
credentials=cred)
304
305
while True:
306
if not clients:
307
break
308
try:
309
next_stop = min(client.next_stop() for client in clients)
310
now = datetime.datetime.now()
311
if next_stop > now:
312
delay = next_stop - now
313
delay_seconds = (delay.days * 24 * 60 * 60
314
+ delay.seconds
315
+ delay.microseconds / 1000000)
316
clients_with_checkers = tuple(client for client in
317
clients
318
if client.checker
319
is not None)
320
input_checks = (udp_server, tcp_server) \
321
+ clients_with_checkers
322
print "Waiting for network",
323
if clients_with_checkers:
324
print "and checkers for:",
325
for client in clients_with_checkers:
326
print client.name,
327
print
328
input, out, err = select.select(input_checks, (), (),
329
delay_seconds)
330
for obj in input:
331
obj.handle_request()
332
# start new checkers
333
for client in clients:
334
if client.it_is_time_to_check(now=now) and \
335
client.checker is None:
336
print "Starting checker for client %(name)s" \
337
% vars(client)
338
client.start_checker()
339
# delete timed-out clients
340
for client in clients.copy():
341
if not client.still_valid(now=now):
342
# log xxx
343
print "Removing client %(name)s" % vars(client)
344
clients.remove(client)
345
except KeyboardInterrupt:
346
break
347
348
# Cleanup here
349
for client in clients:
350
client.stop_checker()
351
352
353
if __name__ == "__main__":
354
main()
355
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0