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- Committer: Teddy Hogeborn
- Date: 2008-07-20 06:33:48 UTC
- Revision ID: teddy@fukt.bsnet.se-20080720063348-jscgy5p0itrgvlo8
* mandos-clients.conf ([foo]): Uncommented.
([foo]/secret): New.
([foo]/secfile): Commented out.
([foo]/checker): Changed to "fping -q -- %%(fqdn)s".
([foo]/timeout): New.
* server.py: New modeline for Python and Emacs. Set a logging format.
(Client.__init__): Bug fix: Choose either the value from the options
object or pass the argument through string_to_delta
for both "timeout" and "interval".
(Client.checker_callback): Bug fix: Do not log spurious "Checker for
<foo> failed" messages.
(Client.start_checker): Moved "Starting checker" log message down to
just before actually starting the subprocess.
Do not redirect the subprocesses' stdout to a
pipe.
(peer_certificate, fingerprint): Added docstrings.
(entry_group_state_changed): Call "killme()" instead of
"main_loop.quit()".
(daemon, killme): New functions.
(exitstatus, main_loop_started): New global variables.
(__main__): Removed the "--cert", "--key", "--ca", and "--crl"
options. Removed the sleep command from the default
checker. Add a console logger in debug mode. Call
"killme()" instead of "main_loop.quit()" when there are no
more clients. Call "daemon()" if not in debug mode.
Register "cleanup()" to run at exit. Ignore some
signals. Catch DBusException to detect another running
server and exit cleanly. Exit with "exitstatus".
(cleanup): New function.
([foo]/secret): New.
([foo]/secfile): Commented out.
([foo]/checker): Changed to "fping -q -- %%(fqdn)s".
([foo]/timeout): New.
* server.py: New modeline for Python and Emacs. Set a logging format.
(Client.__init__): Bug fix: Choose either the value from the options
object or pass the argument through string_to_delta
for both "timeout" and "interval".
(Client.checker_callback): Bug fix: Do not log spurious "Checker for
<foo> failed" messages.
(Client.start_checker): Moved "Starting checker" log message down to
just before actually starting the subprocess.
Do not redirect the subprocesses' stdout to a
pipe.
(peer_certificate, fingerprint): Added docstrings.
(entry_group_state_changed): Call "killme()" instead of
"main_loop.quit()".
(daemon, killme): New functions.
(exitstatus, main_loop_started): New global variables.
(__main__): Removed the "--cert", "--key", "--ca", and "--crl"
options. Removed the sleep command from the default
checker. Add a console logger in debug mode. Call
"killme()" instead of "main_loop.quit()" when there are no
more clients. Call "daemon()" if not in debug mode.
Register "cleanup()" to run at exit. Ignore some
signals. Catch DBusException to detect another running
server and exit cleanly. Exit with "exitstatus".
(cleanup): New function.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
1
1
#!/usr/bin/python
2
2
# -*- mode: python; 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 © 2008-2011 Teddy Hogeborn
15
# Copyright © 2008-2011 Björn Påhlsson
16
#
17
# This program is free software: you can redistribute it and/or modify
18
# it under the terms of the GNU General Public License as published by
19
# the Free Software Foundation, either version 3 of the License, or
20
# (at your option) any later version.
21
#
22
# This program is distributed in the hope that it will be useful,
23
# but WITHOUT ANY WARRANTY; without even the implied warranty of
24
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25
# GNU General Public License for more details.
26
#
27
# You should have received a copy of the GNU General Public License
28
# along with this program. If not, see
29
# <http://www.gnu.org/licenses/>.
30
#
31
# Contact the authors at <mandos@recompile.se>.
32
#
33
34
from __future__ import (division, absolute_import, print_function,
35
unicode_literals)
36
37
import SocketServer as socketserver
3
4
from __future__ import division
5
6
import SocketServer
38
7
import socket
39
import argparse
8
import select
9
from optparse import OptionParser
40
10
import datetime
41
11
import errno
42
12
import gnutls.crypto
45
15
import gnutls.library.functions
46
16
import gnutls.library.constants
47
17
import gnutls.library.types
48
import ConfigParser as configparser
18
import ConfigParser
49
19
import sys
50
20
import re
51
21
import os
52
22
import signal
23
from sets import Set
53
24
import subprocess
54
25
import atexit
55
26
import stat
56
import logging
57
import logging.handlers
58
import pwd
59
import contextlib
60
import struct
61
import fcntl
62
import functools
63
import cPickle as pickle
64
import multiprocessing
65
import types
66
import binascii
67
import tempfile
68
27
69
28
import dbus
70
import dbus.service
71
29
import gobject
72
30
import avahi
73
31
from dbus.mainloop.glib import DBusGMainLoop
74
32
import ctypes
75
import ctypes.util
76
import xml.dom.minidom
77
import inspect
78
import GnuPGInterface
79
80
try:
81
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
82
except AttributeError:
83
try:
84
from IN import SO_BINDTODEVICE
85
except ImportError:
86
SO_BINDTODEVICE = None
87
88
89
version = "1.4.1"
90
stored_state_file = "clients.pickle"
91
92
logger = logging.getLogger()
93
syslogger = (logging.handlers.SysLogHandler
94
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
95
address = str("/dev/log")))
96
97
try:
98
if_nametoindex = (ctypes.cdll.LoadLibrary
99
(ctypes.util.find_library("c"))
100
.if_nametoindex)
101
except (OSError, AttributeError):
102
def if_nametoindex(interface):
103
"Get an interface index the hard way, i.e. using fcntl()"
104
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
105
with contextlib.closing(socket.socket()) as s:
106
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
107
struct.pack(str("16s16x"),
108
interface))
109
interface_index = struct.unpack(str("I"),
110
ifreq[16:20])[0]
111
return interface_index
112
113
114
def initlogger(level=logging.WARNING):
115
"""init logger and add loglevel"""
116
117
syslogger.setFormatter(logging.Formatter
118
('Mandos [%(process)d]: %(levelname)s:'
119
' %(message)s'))
120
logger.addHandler(syslogger)
121
122
console = logging.StreamHandler()
123
console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
124
' [%(process)d]:'
125
' %(levelname)s:'
126
' %(message)s'))
127
logger.addHandler(console)
128
logger.setLevel(level)
129
130
131
class PGPError(Exception):
132
"""Exception if encryption/decryption fails"""
133
pass
134
135
136
class PGPEngine(object):
137
"""A simple class for OpenPGP symmetric encryption & decryption"""
138
def __init__(self):
139
self.gnupg = GnuPGInterface.GnuPG()
140
self.tempdir = tempfile.mkdtemp(prefix="mandos-")
141
self.gnupg = GnuPGInterface.GnuPG()
142
self.gnupg.options.meta_interactive = False
143
self.gnupg.options.homedir = self.tempdir
144
self.gnupg.options.extra_args.extend(['--force-mdc',
145
'--quiet'])
146
147
def __enter__(self):
148
return self
149
150
def __exit__ (self, exc_type, exc_value, traceback):
151
self._cleanup()
152
return False
153
154
def __del__(self):
155
self._cleanup()
156
157
def _cleanup(self):
158
if self.tempdir is not None:
159
# Delete contents of tempdir
160
for root, dirs, files in os.walk(self.tempdir,
161
topdown = False):
162
for filename in files:
163
os.remove(os.path.join(root, filename))
164
for dirname in dirs:
165
os.rmdir(os.path.join(root, dirname))
166
# Remove tempdir
167
os.rmdir(self.tempdir)
168
self.tempdir = None
169
170
def password_encode(self, password):
171
# Passphrase can not be empty and can not contain newlines or
172
# NUL bytes. So we prefix it and hex encode it.
173
return b"mandos" + binascii.hexlify(password)
174
175
def encrypt(self, data, password):
176
self.gnupg.passphrase = self.password_encode(password)
177
with open(os.devnull) as devnull:
178
try:
179
proc = self.gnupg.run(['--symmetric'],
180
create_fhs=['stdin', 'stdout'],
181
attach_fhs={'stderr': devnull})
182
with contextlib.closing(proc.handles['stdin']) as f:
183
f.write(data)
184
with contextlib.closing(proc.handles['stdout']) as f:
185
ciphertext = f.read()
186
proc.wait()
187
except IOError as e:
188
raise PGPError(e)
189
self.gnupg.passphrase = None
190
return ciphertext
191
192
def decrypt(self, data, password):
193
self.gnupg.passphrase = self.password_encode(password)
194
with open(os.devnull) as devnull:
195
try:
196
proc = self.gnupg.run(['--decrypt'],
197
create_fhs=['stdin', 'stdout'],
198
attach_fhs={'stderr': devnull})
199
with contextlib.closing(proc.handles['stdin'] ) as f:
200
f.write(data)
201
with contextlib.closing(proc.handles['stdout']) as f:
202
decrypted_plaintext = f.read()
203
proc.wait()
204
except IOError as e:
205
raise PGPError(e)
206
self.gnupg.passphrase = None
207
return decrypted_plaintext
208
209
210
211
class AvahiError(Exception):
212
def __init__(self, value, *args, **kwargs):
213
self.value = value
214
super(AvahiError, self).__init__(value, *args, **kwargs)
215
def __unicode__(self):
216
return unicode(repr(self.value))
217
218
class AvahiServiceError(AvahiError):
219
pass
220
221
class AvahiGroupError(AvahiError):
222
pass
223
224
225
class AvahiService(object):
226
"""An Avahi (Zeroconf) service.
227
228
Attributes:
229
interface: integer; avahi.IF_UNSPEC or an interface index.
230
Used to optionally bind to the specified interface.
231
name: string; Example: 'Mandos'
232
type: string; Example: '_mandos._tcp'.
233
See <http://www.dns-sd.org/ServiceTypes.html>
234
port: integer; what port to announce
235
TXT: list of strings; TXT record for the service
236
domain: string; Domain to publish on, default to .local if empty.
237
host: string; Host to publish records for, default is localhost
238
max_renames: integer; maximum number of renames
239
rename_count: integer; counter so we only rename after collisions
240
a sensible number of times
241
group: D-Bus Entry Group
242
server: D-Bus Server
243
bus: dbus.SystemBus()
244
"""
245
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
246
servicetype = None, port = None, TXT = None,
247
domain = "", host = "", max_renames = 32768,
248
protocol = avahi.PROTO_UNSPEC, bus = None):
249
self.interface = interface
250
self.name = name
251
self.type = servicetype
252
self.port = port
253
self.TXT = TXT if TXT is not None else []
254
self.domain = domain
255
self.host = host
256
self.rename_count = 0
257
self.max_renames = max_renames
258
self.protocol = protocol
259
self.group = None # our entry group
260
self.server = None
261
self.bus = bus
262
self.entry_group_state_changed_match = None
263
def rename(self):
264
"""Derived from the Avahi example code"""
265
if self.rename_count >= self.max_renames:
266
logger.critical("No suitable Zeroconf service name found"
267
" after %i retries, exiting.",
268
self.rename_count)
269
raise AvahiServiceError("Too many renames")
270
self.name = unicode(self.server
271
.GetAlternativeServiceName(self.name))
272
logger.info("Changing Zeroconf service name to %r ...",
273
self.name)
274
self.remove()
275
try:
276
self.add()
277
except dbus.exceptions.DBusException as error:
278
logger.critical("DBusException: %s", error)
279
self.cleanup()
280
os._exit(1)
281
self.rename_count += 1
282
def remove(self):
283
"""Derived from the Avahi example code"""
284
if self.entry_group_state_changed_match is not None:
285
self.entry_group_state_changed_match.remove()
286
self.entry_group_state_changed_match = None
287
if self.group is not None:
288
self.group.Reset()
289
def add(self):
290
"""Derived from the Avahi example code"""
291
self.remove()
292
if self.group is None:
293
self.group = dbus.Interface(
294
self.bus.get_object(avahi.DBUS_NAME,
295
self.server.EntryGroupNew()),
296
avahi.DBUS_INTERFACE_ENTRY_GROUP)
297
self.entry_group_state_changed_match = (
298
self.group.connect_to_signal(
299
'StateChanged', self.entry_group_state_changed))
300
logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
301
self.name, self.type)
302
self.group.AddService(
303
self.interface,
304
self.protocol,
305
dbus.UInt32(0), # flags
306
self.name, self.type,
307
self.domain, self.host,
308
dbus.UInt16(self.port),
309
avahi.string_array_to_txt_array(self.TXT))
310
self.group.Commit()
311
def entry_group_state_changed(self, state, error):
312
"""Derived from the Avahi example code"""
313
logger.debug("Avahi entry group state change: %i", state)
314
315
if state == avahi.ENTRY_GROUP_ESTABLISHED:
316
logger.debug("Zeroconf service established.")
317
elif state == avahi.ENTRY_GROUP_COLLISION:
318
logger.info("Zeroconf service name collision.")
319
self.rename()
320
elif state == avahi.ENTRY_GROUP_FAILURE:
321
logger.critical("Avahi: Error in group state changed %s",
322
unicode(error))
323
raise AvahiGroupError("State changed: %s"
324
% unicode(error))
325
def cleanup(self):
326
"""Derived from the Avahi example code"""
327
if self.group is not None:
328
try:
329
self.group.Free()
330
except (dbus.exceptions.UnknownMethodException,
331
dbus.exceptions.DBusException):
332
pass
333
self.group = None
334
self.remove()
335
def server_state_changed(self, state, error=None):
336
"""Derived from the Avahi example code"""
337
logger.debug("Avahi server state change: %i", state)
338
bad_states = { avahi.SERVER_INVALID:
339
"Zeroconf server invalid",
340
avahi.SERVER_REGISTERING: None,
341
avahi.SERVER_COLLISION:
342
"Zeroconf server name collision",
343
avahi.SERVER_FAILURE:
344
"Zeroconf server failure" }
345
if state in bad_states:
346
if bad_states[state] is not None:
347
if error is None:
348
logger.error(bad_states[state])
349
else:
350
logger.error(bad_states[state] + ": %r", error)
351
self.cleanup()
352
elif state == avahi.SERVER_RUNNING:
353
self.add()
354
else:
355
if error is None:
356
logger.debug("Unknown state: %r", state)
357
else:
358
logger.debug("Unknown state: %r: %r", state, error)
359
def activate(self):
360
"""Derived from the Avahi example code"""
361
if self.server is None:
362
self.server = dbus.Interface(
363
self.bus.get_object(avahi.DBUS_NAME,
364
avahi.DBUS_PATH_SERVER,
365
follow_name_owner_changes=True),
366
avahi.DBUS_INTERFACE_SERVER)
367
self.server.connect_to_signal("StateChanged",
368
self.server_state_changed)
369
self.server_state_changed(self.server.GetState())
370
371
class AvahiServiceToSyslog(AvahiService):
372
def rename(self):
373
"""Add the new name to the syslog messages"""
374
ret = AvahiService.rename(self)
375
syslogger.setFormatter(logging.Formatter
376
('Mandos (%s) [%%(process)d]:'
377
' %%(levelname)s: %%(message)s'
378
% self.name))
379
return ret
380
381
def timedelta_to_milliseconds(td):
382
"Convert a datetime.timedelta() to milliseconds"
383
return ((td.days * 24 * 60 * 60 * 1000)
384
+ (td.seconds * 1000)
385
+ (td.microseconds // 1000))
386
33
34
import logging
35
import logging.handlers
36
37
logger = logging.Logger('mandos')
38
syslogger = logging.handlers.SysLogHandler\
39
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
40
syslogger.setFormatter(logging.Formatter\
41
('%(levelname)s: %(message)s'))
42
logger.addHandler(syslogger)
43
del syslogger
44
45
# This variable is used to optionally bind to a specified interface.
46
# It is a global variable to fit in with the other variables from the
47
# Avahi server example code.
48
serviceInterface = avahi.IF_UNSPEC
49
# From the Avahi server example code:
50
serviceName = "Mandos"
51
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
52
servicePort = None # Not known at startup
53
serviceTXT = [] # TXT record for the service
54
domain = "" # Domain to publish on, default to .local
55
host = "" # Host to publish records for, default to localhost
56
group = None #our entry group
57
rename_count = 12 # Counter so we only rename after collisions a
58
# sensible number of times
59
# End of Avahi example code
60
61
387
62
class Client(object):
388
63
"""A representation of a client host served by this server.
389
390
64
Attributes:
391
approved: bool(); 'None' if not yet approved/disapproved
392
approval_delay: datetime.timedelta(); Time to wait for approval
393
approval_duration: datetime.timedelta(); Duration of one approval
394
checker: subprocess.Popen(); a running checker process used
395
to see if the client lives.
396
'None' if no process is running.
397
checker_callback_tag: a gobject event source tag, or None
398
checker_command: string; External command which is run to check
399
if client lives. %() expansions are done at
65
name: string; from the config file, used in log messages
66
fingerprint: string (40 or 32 hexadecimal digits); used to
67
uniquely identify the client
68
secret: bytestring; sent verbatim (over TLS) to client
69
fqdn: string (FQDN); available for use by the checker command
70
created: datetime.datetime()
71
last_seen: datetime.datetime() or None if not yet seen
72
timeout: datetime.timedelta(); How long from last_seen until
73
this client is invalid
74
interval: datetime.timedelta(); How often to start a new checker
75
stop_hook: If set, called by stop() as stop_hook(self)
76
checker: subprocess.Popen(); a running checker process used
77
to see if the client lives.
78
Is None if no process is running.
79
checker_initiator_tag: a gobject event source tag, or None
80
stop_initiator_tag: - '' -
81
checker_callback_tag: - '' -
82
checker_command: string; External command which is run to check if
83
client lives. %()s expansions are done at
400
84
runtime with vars(self) as dict, so that for
401
85
instance %(name)s can be used in the command.
402
checker_initiator_tag: a gobject event source tag, or None
403
created: datetime.datetime(); (UTC) object creation
404
client_structure: Object describing what attributes a client has
405
and is used for storing the client at exit
406
current_checker_command: string; current running checker_command
407
disable_initiator_tag: a gobject event source tag, or None
408
enabled: bool()
409
fingerprint: string (40 or 32 hexadecimal digits); used to
410
uniquely identify the client
411
host: string; available for use by the checker command
412
interval: datetime.timedelta(); How often to start a new checker
413
last_approval_request: datetime.datetime(); (UTC) or None
414
last_checked_ok: datetime.datetime(); (UTC) or None
415
416
last_checker_status: integer between 0 and 255 reflecting exit
417
status of last checker. -1 reflects crashed
418
checker, or None.
419
last_enabled: datetime.datetime(); (UTC) or None
420
name: string; from the config file, used in log messages and
421
D-Bus identifiers
422
secret: bytestring; sent verbatim (over TLS) to client
423
timeout: datetime.timedelta(); How long from last_checked_ok
424
until this client is disabled
425
extended_timeout: extra long timeout when password has been sent
426
runtime_expansions: Allowed attributes for runtime expansion.
427
expires: datetime.datetime(); time (UTC) when a client will be
428
disabled, or None
86
Private attibutes:
87
_timeout: Real variable for 'timeout'
88
_interval: Real variable for 'interval'
89
_timeout_milliseconds: Used by gobject.timeout_add()
90
_interval_milliseconds: - '' -
429
91
"""
430
431
runtime_expansions = ("approval_delay", "approval_duration",
432
"created", "enabled", "fingerprint",
433
"host", "interval", "last_checked_ok",
434
"last_enabled", "name", "timeout")
435
436
def timeout_milliseconds(self):
437
"Return the 'timeout' attribute in milliseconds"
438
return timedelta_to_milliseconds(self.timeout)
439
440
def extended_timeout_milliseconds(self):
441
"Return the 'extended_timeout' attribute in milliseconds"
442
return timedelta_to_milliseconds(self.extended_timeout)
443
444
def interval_milliseconds(self):
445
"Return the 'interval' attribute in milliseconds"
446
return timedelta_to_milliseconds(self.interval)
447
448
def approval_delay_milliseconds(self):
449
return timedelta_to_milliseconds(self.approval_delay)
450
451
def __init__(self, name = None, config=None):
452
"""Note: the 'checker' key in 'config' sets the
453
'checker_command' attribute and *not* the 'checker'
454
attribute."""
92
def _set_timeout(self, timeout):
93
"Setter function for 'timeout' attribute"
94
self._timeout = timeout
95
self._timeout_milliseconds = ((self.timeout.days
96
* 24 * 60 * 60 * 1000)
97
+ (self.timeout.seconds * 1000)
98
+ (self.timeout.microseconds
99
// 1000))
100
timeout = property(lambda self: self._timeout,
101
_set_timeout)
102
del _set_timeout
103
def _set_interval(self, interval):
104
"Setter function for 'interval' attribute"
105
self._interval = interval
106
self._interval_milliseconds = ((self.interval.days
107
* 24 * 60 * 60 * 1000)
108
+ (self.interval.seconds
109
* 1000)
110
+ (self.interval.microseconds
111
// 1000))
112
interval = property(lambda self: self._interval,
113
_set_interval)
114
del _set_interval
115
def __init__(self, name=None, options=None, stop_hook=None,
116
fingerprint=None, secret=None, secfile=None,
117
fqdn=None, timeout=None, interval=-1, checker=None):
455
118
self.name = name
456
if config is None:
457
config = {}
458
logger.debug("Creating client %r", self.name)
459
# Uppercase and remove spaces from fingerprint for later
460
# comparison purposes with return value from the fingerprint()
461
# function
462
self.fingerprint = (config["fingerprint"].upper()
463
.replace(" ", ""))
464
logger.debug(" Fingerprint: %s", self.fingerprint)
465
if "secret" in config:
466
self.secret = config["secret"].decode("base64")
467
elif "secfile" in config:
468
with open(os.path.expanduser(os.path.expandvars
469
(config["secfile"])),
470
"rb") as secfile:
471
self.secret = secfile.read()
472
else:
473
raise TypeError("No secret or secfile for client %s"
474
% self.name)
475
self.host = config.get("host", "")
476
self.created = datetime.datetime.utcnow()
477
self.enabled = config.get("enabled", True)
478
self.last_approval_request = None
479
if self.enabled:
480
self.last_enabled = datetime.datetime.utcnow()
481
else:
482
self.last_enabled = None
483
self.last_checked_ok = None
484
self.last_checker_status = None
485
self.timeout = string_to_delta(config["timeout"])
486
self.extended_timeout = string_to_delta(config
487
["extended_timeout"])
488
self.interval = string_to_delta(config["interval"])
119
# Uppercase and remove spaces from fingerprint
120
# for later comparison purposes with return value of
121
# the fingerprint() function
122
self.fingerprint = fingerprint.upper().replace(u" ", u"")
123
if secret:
124
self.secret = secret.decode(u"base64")
125
elif secfile:
126
sf = open(secfile)
127
self.secret = sf.read()
128
sf.close()
129
else:
130
raise RuntimeError(u"No secret or secfile for client %s"
131
% self.name)
132
self.fqdn = fqdn # string
133
self.created = datetime.datetime.now()
134
self.last_seen = None
135
if timeout is None:
136
self.timeout = options.timeout
137
else:
138
self.timeout = string_to_delta(timeout)
139
if interval == -1:
140
self.interval = options.interval
141
else:
142
self.interval = string_to_delta(interval)
143
self.stop_hook = stop_hook
489
144
self.checker = None
490
145
self.checker_initiator_tag = None
491
self.disable_initiator_tag = None
492
if self.enabled:
493
self.expires = datetime.datetime.utcnow() + self.timeout
494
else:
495
self.expires = None
146
self.stop_initiator_tag = None
496
147
self.checker_callback_tag = None
497
self.checker_command = config["checker"]
498
self.current_checker_command = None
499
self.approved = None
500
self.approved_by_default = config.get("approved_by_default",
501
True)
502
self.approvals_pending = 0
503
self.approval_delay = string_to_delta(
504
config["approval_delay"])
505
self.approval_duration = string_to_delta(
506
config["approval_duration"])
507
self.changedstate = (multiprocessing_manager
508
.Condition(multiprocessing_manager
509
.Lock()))
510
self.client_structure = [attr for attr in
511
self.__dict__.iterkeys()
512
if not attr.startswith("_")]
513
self.client_structure.append("client_structure")
514
515
for name, t in inspect.getmembers(type(self),
516
lambda obj:
517
isinstance(obj,
518
property)):
519
if not name.startswith("_"):
520
self.client_structure.append(name)
521
522
# Send notice to process children that client state has changed
523
def send_changedstate(self):
524
with self.changedstate:
525
self.changedstate.notify_all()
526
527
def enable(self):
528
"""Start this client's checker and timeout hooks"""
529
if getattr(self, "enabled", False):
530
# Already enabled
531
return
532
self.send_changedstate()
533
self.expires = datetime.datetime.utcnow() + self.timeout
534
self.enabled = True
535
self.last_enabled = datetime.datetime.utcnow()
536
self.init_checker()
537
538
def disable(self, quiet=True):
539
"""Disable this client."""
540
if not getattr(self, "enabled", False):
541
return False
542
if not quiet:
543
self.send_changedstate()
544
if not quiet:
545
logger.info("Disabling client %s", self.name)
546
if getattr(self, "disable_initiator_tag", False):
547
gobject.source_remove(self.disable_initiator_tag)
548
self.disable_initiator_tag = None
549
self.expires = None
550
if getattr(self, "checker_initiator_tag", False):
551
gobject.source_remove(self.checker_initiator_tag)
552
self.checker_initiator_tag = None
553
self.stop_checker()
554
self.enabled = False
555
# Do not run this again if called by a gobject.timeout_add
556
return False
557
558
def __del__(self):
559
self.disable()
560
561
def init_checker(self):
148
self.check_command = checker
149
def start(self):
150
"""Start this clients checker and timeout hooks"""
562
151
# Schedule a new checker to be started an 'interval' from now,
563
152
# and every interval from then on.
564
self.checker_initiator_tag = (gobject.timeout_add
565
(self.interval_milliseconds(),
566
self.start_checker))
567
# Schedule a disable() when 'timeout' has passed
568
self.disable_initiator_tag = (gobject.timeout_add
569
(self.timeout_milliseconds(),
570
self.disable))
153
self.checker_initiator_tag = gobject.timeout_add\
154
(self._interval_milliseconds,
155
self.start_checker)
571
156
# Also start a new checker *right now*.
572
157
self.start_checker()
573
574
def checker_callback(self, pid, condition, command):
158
# Schedule a stop() when 'timeout' has passed
159
self.stop_initiator_tag = gobject.timeout_add\
160
(self._timeout_milliseconds,
161
self.stop)
162
def stop(self):
163
"""Stop this client.
164
The possibility that this client might be restarted is left
165
open, but not currently used."""
166
logger.debug(u"Stopping client %s", self.name)
167
self.secret = None
168
if self.stop_initiator_tag:
169
gobject.source_remove(self.stop_initiator_tag)
170
self.stop_initiator_tag = None
171
if self.checker_initiator_tag:
172
gobject.source_remove(self.checker_initiator_tag)
173
self.checker_initiator_tag = None
174
self.stop_checker()
175
if self.stop_hook:
176
self.stop_hook(self)
177
# Do not run this again if called by a gobject.timeout_add
178
return False
179
def __del__(self):
180
# Some code duplication here and in stop()
181
if hasattr(self, "stop_initiator_tag") \
182
and self.stop_initiator_tag:
183
gobject.source_remove(self.stop_initiator_tag)
184
self.stop_initiator_tag = None
185
if hasattr(self, "checker_initiator_tag") \
186
and self.checker_initiator_tag:
187
gobject.source_remove(self.checker_initiator_tag)
188
self.checker_initiator_tag = None
189
self.stop_checker()
190
def checker_callback(self, pid, condition):
575
191
"""The checker has completed, so take appropriate actions."""
576
self.checker_callback_tag = None
577
self.checker = None
578
if os.WIFEXITED(condition):
579
self.last_checker_status = os.WEXITSTATUS(condition)
580
if self.last_checker_status == 0:
581
logger.info("Checker for %(name)s succeeded",
582
vars(self))
583
self.checked_ok()
584
else:
585
logger.info("Checker for %(name)s failed",
586
vars(self))
587
else:
588
self.last_checker_status = -1
589
logger.warning("Checker for %(name)s crashed?",
192
now = datetime.datetime.now()
193
if os.WIFEXITED(condition) \
194
and (os.WEXITSTATUS(condition) == 0):
195
logger.debug(u"Checker for %(name)s succeeded",
196
vars(self))
197
self.last_seen = now
198
gobject.source_remove(self.stop_initiator_tag)
199
self.stop_initiator_tag = gobject.timeout_add\
200
(self._timeout_milliseconds,
201
self.stop)
202
elif not os.WIFEXITED(condition):
203
logger.warning(u"Checker for %(name)s crashed?",
590
204
vars(self))
591
592
def checked_ok(self, timeout=None):
593
"""Bump up the timeout for this client.
594
595
This should only be called when the client has been seen,
596
alive and well.
597
"""
598
if timeout is None:
599
timeout = self.timeout
600
self.last_checked_ok = datetime.datetime.utcnow()
601
if self.disable_initiator_tag is not None:
602
gobject.source_remove(self.disable_initiator_tag)
603
if getattr(self, "enabled", False):
604
self.disable_initiator_tag = (gobject.timeout_add
605
(timedelta_to_milliseconds
606
(timeout), self.disable))
607
self.expires = datetime.datetime.utcnow() + timeout
608
609
def need_approval(self):
610
self.last_approval_request = datetime.datetime.utcnow()
611
205
else:
206
logger.debug(u"Checker for %(name)s failed",
207
vars(self))
208
self.checker = None
209
self.checker_callback_tag = None
612
210
def start_checker(self):
613
211
"""Start a new checker subprocess if one is not running.
614
615
212
If a checker already exists, leave it running and do
616
213
nothing."""
617
# The reason for not killing a running checker is that if we
618
# did that, then if a checker (for some reason) started
619
# running slowly and taking more than 'interval' time, the
620
# client would inevitably timeout, since no checker would get
621
# a chance to run to completion. If we instead leave running
622
# checkers alone, the checker would have to take more time
623
# than 'timeout' for the client to be disabled, which is as it
624
# should be.
625
626
# If a checker exists, make sure it is not a zombie
627
try:
628
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
629
except (AttributeError, OSError) as error:
630
if (isinstance(error, OSError)
631
and error.errno != errno.ECHILD):
632
raise error
633
else:
634
if pid:
635
logger.warning("Checker was a zombie")
636
gobject.source_remove(self.checker_callback_tag)
637
self.checker_callback(pid, status,
638
self.current_checker_command)
639
# Start a new checker if needed
640
214
if self.checker is None:
641
215
try:
642
# In case checker_command has exactly one % operator
643
command = self.checker_command % self.host
216
command = self.check_command % self.fqdn
644
217
except TypeError:
645
# Escape attributes for the shell
646
escaped_attrs = dict(
647
(attr,
648
re.escape(unicode(str(getattr(self, attr, "")),
649
errors=
650
'replace')))
651
for attr in
652
self.runtime_expansions)
653
218
escaped_attrs = dict((key, re.escape(str(val)))
219
for key, val in
220
vars(self).iteritems())
654
221
try:
655
command = self.checker_command % escaped_attrs
656
except TypeError as error:
657
logger.error('Could not format string "%s":'
658
' %s', self.checker_command, error)
222
command = self.check_command % escaped_attrs
223
except TypeError, error:
224
logger.critical(u'Could not format string "%s":'
225
u' %s', self.check_command, error)
659
226
return True # Try again later
660
self.current_checker_command = command
661
227
try:
662
logger.info("Starting checker %r for %s",
663
command, self.name)
664
# We don't need to redirect stdout and stderr, since
665
# in normal mode, that is already done by daemon(),
666
# and in debug mode we don't want to. (Stdin is
667
# always replaced by /dev/null.)
668
self.checker = subprocess.Popen(command,
669
close_fds=True,
670
shell=True, cwd="/")
671
self.checker_callback_tag = (gobject.child_watch_add
672
(self.checker.pid,
673
self.checker_callback,
674
data=command))
675
# The checker may have completed before the gobject
676
# watch was added. Check for this.
677
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
678
if pid:
679
gobject.source_remove(self.checker_callback_tag)
680
self.checker_callback(pid, status, command)
681
except OSError as error:
682
logger.error("Failed to start subprocess: %s",
228
logger.debug(u"Starting checker %r for %s",
229
command, self.name)
230
self.checker = subprocess.\
231
Popen(command,
232
close_fds=True, shell=True,
233
cwd="/")
234
self.checker_callback_tag = gobject.child_watch_add\
235
(self.checker.pid,
236
self.checker_callback)
237
except subprocess.OSError, error:
238
logger.error(u"Failed to start subprocess: %s",
683
239
error)
684
240
# Re-run this periodically if run by gobject.timeout_add
685
241
return True
686
687
242
def stop_checker(self):
688
243
"""Force the checker process, if any, to stop."""
689
if self.checker_callback_tag:
690
gobject.source_remove(self.checker_callback_tag)
691
self.checker_callback_tag = None
692
if getattr(self, "checker", None) is None:
244
if not hasattr(self, "checker") or self.checker is None:
693
245
return
694
logger.debug("Stopping checker for %(name)s", vars(self))
695
try:
696
os.kill(self.checker.pid, signal.SIGTERM)
697
#time.sleep(0.5)
698
#if self.checker.poll() is None:
699
# os.kill(self.checker.pid, signal.SIGKILL)
700
except OSError as error:
701
if error.errno != errno.ESRCH: # No such process
702
raise
703
self.checker = None
704
705
706
def dbus_service_property(dbus_interface, signature="v",
707
access="readwrite", byte_arrays=False):
708
"""Decorators for marking methods of a DBusObjectWithProperties to
709
become properties on the D-Bus.
710
711
The decorated method will be called with no arguments by "Get"
712
and with one argument by "Set".
713
714
The parameters, where they are supported, are the same as
715
dbus.service.method, except there is only "signature", since the
716
type from Get() and the type sent to Set() is the same.
717
"""
718
# Encoding deeply encoded byte arrays is not supported yet by the
719
# "Set" method, so we fail early here:
720
if byte_arrays and signature != "ay":
721
raise ValueError("Byte arrays not supported for non-'ay'"
722
" signature %r" % signature)
723
def decorator(func):
724
func._dbus_is_property = True
725
func._dbus_interface = dbus_interface
726
func._dbus_signature = signature
727
func._dbus_access = access
728
func._dbus_name = func.__name__
729
if func._dbus_name.endswith("_dbus_property"):
730
func._dbus_name = func._dbus_name[:-14]
731
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
732
return func
733
return decorator
734
735
736
class DBusPropertyException(dbus.exceptions.DBusException):
737
"""A base class for D-Bus property-related exceptions
738
"""
739
def __unicode__(self):
740
return unicode(str(self))
741
742
743
class DBusPropertyAccessException(DBusPropertyException):
744
"""A property's access permissions disallows an operation.
745
"""
746
pass
747
748
749
class DBusPropertyNotFound(DBusPropertyException):
750
"""An attempt was made to access a non-existing property.
751
"""
752
pass
753
754
755
class DBusObjectWithProperties(dbus.service.Object):
756
"""A D-Bus object with properties.
757
758
Classes inheriting from this can use the dbus_service_property
759
decorator to expose methods as D-Bus properties. It exposes the
760
standard Get(), Set(), and GetAll() methods on the D-Bus.
761
"""
762
763
@staticmethod
764
def _is_dbus_property(obj):
765
return getattr(obj, "_dbus_is_property", False)
766
767
def _get_all_dbus_properties(self):
768
"""Returns a generator of (name, attribute) pairs
769
"""
770
return ((prop.__get__(self)._dbus_name, prop.__get__(self))
771
for cls in self.__class__.__mro__
772
for name, prop in
773
inspect.getmembers(cls, self._is_dbus_property))
774
775
def _get_dbus_property(self, interface_name, property_name):
776
"""Returns a bound method if one exists which is a D-Bus
777
property with the specified name and interface.
778
"""
779
for cls in self.__class__.__mro__:
780
for name, value in (inspect.getmembers
781
(cls, self._is_dbus_property)):
782
if (value._dbus_name == property_name
783
and value._dbus_interface == interface_name):
784
return value.__get__(self)
785
786
# No such property
787
raise DBusPropertyNotFound(self.dbus_object_path + ":"
788
+ interface_name + "."
789
+ property_name)
790
791
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
792
out_signature="v")
793
def Get(self, interface_name, property_name):
794
"""Standard D-Bus property Get() method, see D-Bus standard.
795
"""
796
prop = self._get_dbus_property(interface_name, property_name)
797
if prop._dbus_access == "write":
798
raise DBusPropertyAccessException(property_name)
799
value = prop()
800
if not hasattr(value, "variant_level"):
801
return value
802
return type(value)(value, variant_level=value.variant_level+1)
803
804
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
805
def Set(self, interface_name, property_name, value):
806
"""Standard D-Bus property Set() method, see D-Bus standard.
807
"""
808
prop = self._get_dbus_property(interface_name, property_name)
809
if prop._dbus_access == "read":
810
raise DBusPropertyAccessException(property_name)
811
if prop._dbus_get_args_options["byte_arrays"]:
812
# The byte_arrays option is not supported yet on
813
# signatures other than "ay".
814
if prop._dbus_signature != "ay":
815
raise ValueError
816
value = dbus.ByteArray(''.join(unichr(byte)
817
for byte in value))
818
prop(value)
819
820
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
821
out_signature="a{sv}")
822
def GetAll(self, interface_name):
823
"""Standard D-Bus property GetAll() method, see D-Bus
824
standard.
825
826
Note: Will not include properties with access="write".
827
"""
828
properties = {}
829
for name, prop in self._get_all_dbus_properties():
830
if (interface_name
831
and interface_name != prop._dbus_interface):
832
# Interface non-empty but did not match
833
continue
834
# Ignore write-only properties
835
if prop._dbus_access == "write":
836
continue
837
value = prop()
838
if not hasattr(value, "variant_level"):
839
properties[name] = value
840
continue
841
properties[name] = type(value)(value, variant_level=
842
value.variant_level+1)
843
return dbus.Dictionary(properties, signature="sv")
844
845
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
846
out_signature="s",
847
path_keyword='object_path',
848
connection_keyword='connection')
849
def Introspect(self, object_path, connection):
850
"""Standard D-Bus method, overloaded to insert property tags.
851
"""
852
xmlstring = dbus.service.Object.Introspect(self, object_path,
853
connection)
854
try:
855
document = xml.dom.minidom.parseString(xmlstring)
856
def make_tag(document, name, prop):
857
e = document.createElement("property")
858
e.setAttribute("name", name)
859
e.setAttribute("type", prop._dbus_signature)
860
e.setAttribute("access", prop._dbus_access)
861
return e
862
for if_tag in document.getElementsByTagName("interface"):
863
for tag in (make_tag(document, name, prop)
864
for name, prop
865
in self._get_all_dbus_properties()
866
if prop._dbus_interface
867
== if_tag.getAttribute("name")):
868
if_tag.appendChild(tag)
869
# Add the names to the return values for the
870
# "org.freedesktop.DBus.Properties" methods
871
if (if_tag.getAttribute("name")
872
== "org.freedesktop.DBus.Properties"):
873
for cn in if_tag.getElementsByTagName("method"):
874
if cn.getAttribute("name") == "Get":
875
for arg in cn.getElementsByTagName("arg"):
876
if (arg.getAttribute("direction")
877
== "out"):
878
arg.setAttribute("name", "value")
879
elif cn.getAttribute("name") == "GetAll":
880
for arg in cn.getElementsByTagName("arg"):
881
if (arg.getAttribute("direction")
882
== "out"):
883
arg.setAttribute("name", "props")
884
xmlstring = document.toxml("utf-8")
885
document.unlink()
886
except (AttributeError, xml.dom.DOMException,
887
xml.parsers.expat.ExpatError) as error:
888
logger.error("Failed to override Introspection method",
889
error)
890
return xmlstring
891
892
893
def datetime_to_dbus (dt, variant_level=0):
894
"""Convert a UTC datetime.datetime() to a D-Bus type."""
895
if dt is None:
896
return dbus.String("", variant_level = variant_level)
897
return dbus.String(dt.isoformat(),
898
variant_level=variant_level)
899
900
901
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
902
.__metaclass__):
903
"""Applied to an empty subclass of a D-Bus object, this metaclass
904
will add additional D-Bus attributes matching a certain pattern.
905
"""
906
def __new__(mcs, name, bases, attr):
907
# Go through all the base classes which could have D-Bus
908
# methods, signals, or properties in them
909
for base in (b for b in bases
910
if issubclass(b, dbus.service.Object)):
911
# Go though all attributes of the base class
912
for attrname, attribute in inspect.getmembers(base):
913
# Ignore non-D-Bus attributes, and D-Bus attributes
914
# with the wrong interface name
915
if (not hasattr(attribute, "_dbus_interface")
916
or not attribute._dbus_interface
917
.startswith("se.recompile.Mandos")):
918
continue
919
# Create an alternate D-Bus interface name based on
920
# the current name
921
alt_interface = (attribute._dbus_interface
922
.replace("se.recompile.Mandos",
923
"se.bsnet.fukt.Mandos"))
924
# Is this a D-Bus signal?
925
if getattr(attribute, "_dbus_is_signal", False):
926
# Extract the original non-method function by
927
# black magic
928
nonmethod_func = (dict(
929
zip(attribute.func_code.co_freevars,
930
attribute.__closure__))["func"]
931
.cell_contents)
932
# Create a new, but exactly alike, function
933
# object, and decorate it to be a new D-Bus signal
934
# with the alternate D-Bus interface name
935
new_function = (dbus.service.signal
936
(alt_interface,
937
attribute._dbus_signature)
938
(types.FunctionType(
939
nonmethod_func.func_code,
940
nonmethod_func.func_globals,
941
nonmethod_func.func_name,
942
nonmethod_func.func_defaults,
943
nonmethod_func.func_closure)))
944
# Define a creator of a function to call both the
945
# old and new functions, so both the old and new
946
# signals gets sent when the function is called
947
def fixscope(func1, func2):
948
"""This function is a scope container to pass
949
func1 and func2 to the "call_both" function
950
outside of its arguments"""
951
def call_both(*args, **kwargs):
952
"""This function will emit two D-Bus
953
signals by calling func1 and func2"""
954
func1(*args, **kwargs)
955
func2(*args, **kwargs)
956
return call_both
957
# Create the "call_both" function and add it to
958
# the class
959
attr[attrname] = fixscope(attribute,
960
new_function)
961
# Is this a D-Bus method?
962
elif getattr(attribute, "_dbus_is_method", False):
963
# Create a new, but exactly alike, function
964
# object. Decorate it to be a new D-Bus method
965
# with the alternate D-Bus interface name. Add it
966
# to the class.
967
attr[attrname] = (dbus.service.method
968
(alt_interface,
969
attribute._dbus_in_signature,
970
attribute._dbus_out_signature)
971
(types.FunctionType
972
(attribute.func_code,
973
attribute.func_globals,
974
attribute.func_name,
975
attribute.func_defaults,
976
attribute.func_closure)))
977
# Is this a D-Bus property?
978
elif getattr(attribute, "_dbus_is_property", False):
979
# Create a new, but exactly alike, function
980
# object, and decorate it to be a new D-Bus
981
# property with the alternate D-Bus interface
982
# name. Add it to the class.
983
attr[attrname] = (dbus_service_property
984
(alt_interface,
985
attribute._dbus_signature,
986
attribute._dbus_access,
987
attribute
988
._dbus_get_args_options
989
["byte_arrays"])
990
(types.FunctionType
991
(attribute.func_code,
992
attribute.func_globals,
993
attribute.func_name,
994
attribute.func_defaults,
995
attribute.func_closure)))
996
return type.__new__(mcs, name, bases, attr)
997
998
999
class ClientDBus(Client, DBusObjectWithProperties):
1000
"""A Client class using D-Bus
1001
1002
Attributes:
1003
dbus_object_path: dbus.ObjectPath
1004
bus: dbus.SystemBus()
1005
"""
1006
1007
runtime_expansions = (Client.runtime_expansions
1008
+ ("dbus_object_path",))
1009
1010
# dbus.service.Object doesn't use super(), so we can't either.
1011
1012
def __init__(self, bus = None, *args, **kwargs):
1013
self.bus = bus
1014
Client.__init__(self, *args, **kwargs)
1015
1016
self._approvals_pending = 0
1017
# Only now, when this client is initialized, can it show up on
1018
# the D-Bus
1019
client_object_name = unicode(self.name).translate(
1020
{ord("."): ord("_"),
1021
ord("-"): ord("_")})
1022
self.dbus_object_path = (dbus.ObjectPath
1023
("/clients/" + client_object_name))
1024
DBusObjectWithProperties.__init__(self, self.bus,
1025
self.dbus_object_path)
1026
1027
def notifychangeproperty(transform_func,
1028
dbus_name, type_func=lambda x: x,
1029
variant_level=1):
1030
""" Modify a variable so that it's a property which announces
1031
its changes to DBus.
1032
1033
transform_fun: Function that takes a value and a variant_level
1034
and transforms it to a D-Bus type.
1035
dbus_name: D-Bus name of the variable
1036
type_func: Function that transform the value before sending it
1037
to the D-Bus. Default: no transform
1038
variant_level: D-Bus variant level. Default: 1
1039
"""
1040
attrname = "_{0}".format(dbus_name)
1041
def setter(self, value):
1042
if hasattr(self, "dbus_object_path"):
1043
if (not hasattr(self, attrname) or
1044
type_func(getattr(self, attrname, None))
1045
!= type_func(value)):
1046
dbus_value = transform_func(type_func(value),
1047
variant_level
1048
=variant_level)
1049
self.PropertyChanged(dbus.String(dbus_name),
1050
dbus_value)
1051
setattr(self, attrname, value)
1052
1053
return property(lambda self: getattr(self, attrname), setter)
1054
1055
1056
expires = notifychangeproperty(datetime_to_dbus, "Expires")
1057
approvals_pending = notifychangeproperty(dbus.Boolean,
1058
"ApprovalPending",
1059
type_func = bool)
1060
enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1061
last_enabled = notifychangeproperty(datetime_to_dbus,
1062
"LastEnabled")
1063
checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1064
type_func = lambda checker:
1065
checker is not None)
1066
last_checked_ok = notifychangeproperty(datetime_to_dbus,
1067
"LastCheckedOK")
1068
last_approval_request = notifychangeproperty(
1069
datetime_to_dbus, "LastApprovalRequest")
1070
approved_by_default = notifychangeproperty(dbus.Boolean,
1071
"ApprovedByDefault")
1072
approval_delay = notifychangeproperty(dbus.UInt16,
1073
"ApprovalDelay",
1074
type_func =
1075
timedelta_to_milliseconds)
1076
approval_duration = notifychangeproperty(
1077
dbus.UInt16, "ApprovalDuration",
1078
type_func = timedelta_to_milliseconds)
1079
host = notifychangeproperty(dbus.String, "Host")
1080
timeout = notifychangeproperty(dbus.UInt16, "Timeout",
1081
type_func =
1082
timedelta_to_milliseconds)
1083
extended_timeout = notifychangeproperty(
1084
dbus.UInt16, "ExtendedTimeout",
1085
type_func = timedelta_to_milliseconds)
1086
interval = notifychangeproperty(dbus.UInt16,
1087
"Interval",
1088
type_func =
1089
timedelta_to_milliseconds)
1090
checker_command = notifychangeproperty(dbus.String, "Checker")
1091
1092
del notifychangeproperty
1093
1094
def __del__(self, *args, **kwargs):
1095
try:
1096
self.remove_from_connection()
1097
except LookupError:
1098
pass
1099
if hasattr(DBusObjectWithProperties, "__del__"):
1100
DBusObjectWithProperties.__del__(self, *args, **kwargs)
1101
Client.__del__(self, *args, **kwargs)
1102
1103
def checker_callback(self, pid, condition, command,
1104
*args, **kwargs):
246
gobject.source_remove(self.checker_callback_tag)
1105
247
self.checker_callback_tag = None
248
os.kill(self.checker.pid, signal.SIGTERM)
249
if self.checker.poll() is None:
250
os.kill(self.checker.pid, signal.SIGKILL)
1106
251
self.checker = None
1107
if os.WIFEXITED(condition):
1108
exitstatus = os.WEXITSTATUS(condition)
1109
# Emit D-Bus signal
1110
self.CheckerCompleted(dbus.Int16(exitstatus),
1111
dbus.Int64(condition),
1112
dbus.String(command))
1113
else:
1114
# Emit D-Bus signal
1115
self.CheckerCompleted(dbus.Int16(-1),
1116
dbus.Int64(condition),
1117
dbus.String(command))
1118
1119
return Client.checker_callback(self, pid, condition, command,
1120
*args, **kwargs)
1121
1122
def start_checker(self, *args, **kwargs):
1123
old_checker = self.checker
1124
if self.checker is not None:
1125
old_checker_pid = self.checker.pid
1126
else:
1127
old_checker_pid = None
1128
r = Client.start_checker(self, *args, **kwargs)
1129
# Only if new checker process was started
1130
if (self.checker is not None
1131
and old_checker_pid != self.checker.pid):
1132
# Emit D-Bus signal
1133
self.CheckerStarted(self.current_checker_command)
1134
return r
1135
1136
def _reset_approved(self):
1137
self.approved = None
1138
return False
1139
1140
def approve(self, value=True):
1141
self.send_changedstate()
1142
self.approved = value
1143
gobject.timeout_add(timedelta_to_milliseconds
1144
(self.approval_duration),
1145
self._reset_approved)
1146
1147
1148
## D-Bus methods, signals & properties
1149
_interface = "se.recompile.Mandos.Client"
1150
1151
## Signals
1152
1153
# CheckerCompleted - signal
1154
@dbus.service.signal(_interface, signature="nxs")
1155
def CheckerCompleted(self, exitcode, waitstatus, command):
1156
"D-Bus signal"
1157
pass
1158
1159
# CheckerStarted - signal
1160
@dbus.service.signal(_interface, signature="s")
1161
def CheckerStarted(self, command):
1162
"D-Bus signal"
1163
pass
1164
1165
# PropertyChanged - signal
1166
@dbus.service.signal(_interface, signature="sv")
1167
def PropertyChanged(self, property, value):
1168
"D-Bus signal"
1169
pass
1170
1171
# GotSecret - signal
1172
@dbus.service.signal(_interface)
1173
def GotSecret(self):
1174
"""D-Bus signal
1175
Is sent after a successful transfer of secret from the Mandos
1176
server to mandos-client
1177
"""
1178
pass
1179
1180
# Rejected - signal
1181
@dbus.service.signal(_interface, signature="s")
1182
def Rejected(self, reason):
1183
"D-Bus signal"
1184
pass
1185
1186
# NeedApproval - signal
1187
@dbus.service.signal(_interface, signature="tb")
1188
def NeedApproval(self, timeout, default):
1189
"D-Bus signal"
1190
return self.need_approval()
1191
1192
# NeRwequest - signal
1193
@dbus.service.signal(_interface, signature="s")
1194
def NewRequest(self, ip):
1195
"""D-Bus signal
1196
Is sent after a client request a password.
1197
"""
1198
pass
1199
1200
## Methods
1201
1202
# Approve - method
1203
@dbus.service.method(_interface, in_signature="b")
1204
def Approve(self, value):
1205
self.approve(value)
1206
1207
# CheckedOK - method
1208
@dbus.service.method(_interface)
1209
def CheckedOK(self):
1210
self.checked_ok()
1211
1212
# Enable - method
1213
@dbus.service.method(_interface)
1214
def Enable(self):
1215
"D-Bus method"
1216
self.enable()
1217
1218
# StartChecker - method
1219
@dbus.service.method(_interface)
1220
def StartChecker(self):
1221
"D-Bus method"
1222
self.start_checker()
1223
1224
# Disable - method
1225
@dbus.service.method(_interface)
1226
def Disable(self):
1227
"D-Bus method"
1228
self.disable()
1229
1230
# StopChecker - method
1231
@dbus.service.method(_interface)
1232
def StopChecker(self):
1233
self.stop_checker()
1234
1235
## Properties
1236
1237
# ApprovalPending - property
1238
@dbus_service_property(_interface, signature="b", access="read")
1239
def ApprovalPending_dbus_property(self):
1240
return dbus.Boolean(bool(self.approvals_pending))
1241
1242
# ApprovedByDefault - property
1243
@dbus_service_property(_interface, signature="b",
1244
access="readwrite")
1245
def ApprovedByDefault_dbus_property(self, value=None):
1246
if value is None: # get
1247
return dbus.Boolean(self.approved_by_default)
1248
self.approved_by_default = bool(value)
1249
1250
# ApprovalDelay - property
1251
@dbus_service_property(_interface, signature="t",
1252
access="readwrite")
1253
def ApprovalDelay_dbus_property(self, value=None):
1254
if value is None: # get
1255
return dbus.UInt64(self.approval_delay_milliseconds())
1256
self.approval_delay = datetime.timedelta(0, 0, 0, value)
1257
1258
# ApprovalDuration - property
1259
@dbus_service_property(_interface, signature="t",
1260
access="readwrite")
1261
def ApprovalDuration_dbus_property(self, value=None):
1262
if value is None: # get
1263
return dbus.UInt64(timedelta_to_milliseconds(
1264
self.approval_duration))
1265
self.approval_duration = datetime.timedelta(0, 0, 0, value)
1266
1267
# Name - property
1268
@dbus_service_property(_interface, signature="s", access="read")
1269
def Name_dbus_property(self):
1270
return dbus.String(self.name)
1271
1272
# Fingerprint - property
1273
@dbus_service_property(_interface, signature="s", access="read")
1274
def Fingerprint_dbus_property(self):
1275
return dbus.String(self.fingerprint)
1276
1277
# Host - property
1278
@dbus_service_property(_interface, signature="s",
1279
access="readwrite")
1280
def Host_dbus_property(self, value=None):
1281
if value is None: # get
1282
return dbus.String(self.host)
1283
self.host = unicode(value)
1284
1285
# Created - property
1286
@dbus_service_property(_interface, signature="s", access="read")
1287
def Created_dbus_property(self):
1288
return datetime_to_dbus(self.created)
1289
1290
# LastEnabled - property
1291
@dbus_service_property(_interface, signature="s", access="read")
1292
def LastEnabled_dbus_property(self):
1293
return datetime_to_dbus(self.last_enabled)
1294
1295
# Enabled - property
1296
@dbus_service_property(_interface, signature="b",
1297
access="readwrite")
1298
def Enabled_dbus_property(self, value=None):
1299
if value is None: # get
1300
return dbus.Boolean(self.enabled)
1301
if value:
1302
self.enable()
1303
else:
1304
self.disable()
1305
1306
# LastCheckedOK - property
1307
@dbus_service_property(_interface, signature="s",
1308
access="readwrite")
1309
def LastCheckedOK_dbus_property(self, value=None):
1310
if value is not None:
1311
self.checked_ok()
1312
return
1313
return datetime_to_dbus(self.last_checked_ok)
1314
1315
# Expires - property
1316
@dbus_service_property(_interface, signature="s", access="read")
1317
def Expires_dbus_property(self):
1318
return datetime_to_dbus(self.expires)
1319
1320
# LastApprovalRequest - property
1321
@dbus_service_property(_interface, signature="s", access="read")
1322
def LastApprovalRequest_dbus_property(self):
1323
return datetime_to_dbus(self.last_approval_request)
1324
1325
# Timeout - property
1326
@dbus_service_property(_interface, signature="t",
1327
access="readwrite")
1328
def Timeout_dbus_property(self, value=None):
1329
if value is None: # get
1330
return dbus.UInt64(self.timeout_milliseconds())
1331
self.timeout = datetime.timedelta(0, 0, 0, value)
1332
if getattr(self, "disable_initiator_tag", None) is None:
1333
return
1334
# Reschedule timeout
1335
gobject.source_remove(self.disable_initiator_tag)
1336
self.disable_initiator_tag = None
1337
self.expires = None
1338
time_to_die = timedelta_to_milliseconds((self
1339
.last_checked_ok
1340
+ self.timeout)
1341
- datetime.datetime
1342
.utcnow())
1343
if time_to_die <= 0:
1344
# The timeout has passed
1345
self.disable()
1346
else:
1347
self.expires = (datetime.datetime.utcnow()
1348
+ datetime.timedelta(milliseconds =
1349
time_to_die))
1350
self.disable_initiator_tag = (gobject.timeout_add
1351
(time_to_die, self.disable))
1352
1353
# ExtendedTimeout - property
1354
@dbus_service_property(_interface, signature="t",
1355
access="readwrite")
1356
def ExtendedTimeout_dbus_property(self, value=None):
1357
if value is None: # get
1358
return dbus.UInt64(self.extended_timeout_milliseconds())
1359
self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1360
1361
# Interval - property
1362
@dbus_service_property(_interface, signature="t",
1363
access="readwrite")
1364
def Interval_dbus_property(self, value=None):
1365
if value is None: # get
1366
return dbus.UInt64(self.interval_milliseconds())
1367
self.interval = datetime.timedelta(0, 0, 0, value)
1368
if getattr(self, "checker_initiator_tag", None) is None:
1369
return
1370
if self.enabled:
1371
# Reschedule checker run
1372
gobject.source_remove(self.checker_initiator_tag)
1373
self.checker_initiator_tag = (gobject.timeout_add
1374
(value, self.start_checker))
1375
self.start_checker() # Start one now, too
1376
1377
# Checker - property
1378
@dbus_service_property(_interface, signature="s",
1379
access="readwrite")
1380
def Checker_dbus_property(self, value=None):
1381
if value is None: # get
1382
return dbus.String(self.checker_command)
1383
self.checker_command = unicode(value)
1384
1385
# CheckerRunning - property
1386
@dbus_service_property(_interface, signature="b",
1387
access="readwrite")
1388
def CheckerRunning_dbus_property(self, value=None):
1389
if value is None: # get
1390
return dbus.Boolean(self.checker is not None)
1391
if value:
1392
self.start_checker()
1393
else:
1394
self.stop_checker()
1395
1396
# ObjectPath - property
1397
@dbus_service_property(_interface, signature="o", access="read")
1398
def ObjectPath_dbus_property(self):
1399
return self.dbus_object_path # is already a dbus.ObjectPath
1400
1401
# Secret = property
1402
@dbus_service_property(_interface, signature="ay",
1403
access="write", byte_arrays=True)
1404
def Secret_dbus_property(self, value):
1405
self.secret = str(value)
1406
1407
del _interface
1408
1409
1410
class ProxyClient(object):
1411
def __init__(self, child_pipe, fpr, address):
1412
self._pipe = child_pipe
1413
self._pipe.send(('init', fpr, address))
1414
if not self._pipe.recv():
1415
raise KeyError()
1416
1417
def __getattribute__(self, name):
1418
if name == '_pipe':
1419
return super(ProxyClient, self).__getattribute__(name)
1420
self._pipe.send(('getattr', name))
1421
data = self._pipe.recv()
1422
if data[0] == 'data':
1423
return data[1]
1424
if data[0] == 'function':
1425
def func(*args, **kwargs):
1426
self._pipe.send(('funcall', name, args, kwargs))
1427
return self._pipe.recv()[1]
1428
return func
1429
1430
def __setattr__(self, name, value):
1431
if name == '_pipe':
1432
return super(ProxyClient, self).__setattr__(name, value)
1433
self._pipe.send(('setattr', name, value))
1434
1435
1436
class ClientDBusTransitional(ClientDBus):
1437
__metaclass__ = AlternateDBusNamesMetaclass
1438
1439
1440
class ClientHandler(socketserver.BaseRequestHandler, object):
1441
"""A class to handle client connections.
1442
1443
Instantiated once for each connection to handle it.
252
def still_valid(self, now=None):
253
"""Has the timeout not yet passed for this client?"""
254
if now is None:
255
now = datetime.datetime.now()
256
if self.last_seen is None:
257
return now < (self.created + self.timeout)
258
else:
259
return now < (self.last_seen + self.timeout)
260
261
262
def peer_certificate(session):
263
"Return an OpenPGP data packet string for the peer's certificate"
264
# If not an OpenPGP certificate...
265
if gnutls.library.functions.gnutls_certificate_type_get\
266
(session._c_object) \
267
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
268
# ...do the normal thing
269
return session.peer_certificate
270
list_size = ctypes.c_uint()
271
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
272
(session._c_object, ctypes.byref(list_size))
273
if list_size.value == 0:
274
return None
275
cert = cert_list[0]
276
return ctypes.string_at(cert.data, cert.size)
277
278
279
def fingerprint(openpgp):
280
"Convert an OpenPGP data string to a hexdigit fingerprint string"
281
# New empty GnuTLS certificate
282
crt = gnutls.library.types.gnutls_openpgp_crt_t()
283
gnutls.library.functions.gnutls_openpgp_crt_init\
284
(ctypes.byref(crt))
285
# New GnuTLS "datum" with the OpenPGP public key
286
datum = gnutls.library.types.gnutls_datum_t\
287
(ctypes.cast(ctypes.c_char_p(openpgp),
288
ctypes.POINTER(ctypes.c_ubyte)),
289
ctypes.c_uint(len(openpgp)))
290
# Import the OpenPGP public key into the certificate
291
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
292
(crt,
293
ctypes.byref(datum),
294
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
295
# New buffer for the fingerprint
296
buffer = ctypes.create_string_buffer(20)
297
buffer_length = ctypes.c_size_t()
298
# Get the fingerprint from the certificate into the buffer
299
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
300
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
301
# Deinit the certificate
302
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
303
# Convert the buffer to a Python bytestring
304
fpr = ctypes.string_at(buffer, buffer_length.value)
305
# Convert the bytestring to hexadecimal notation
306
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
307
return hex_fpr
308
309
310
class tcp_handler(SocketServer.BaseRequestHandler, object):
311
"""A TCP request handler class.
312
Instantiated by IPv6_TCPServer for each request to handle it.
1444
313
Note: This will run in its own forked process."""
1445
314
1446
315
def handle(self):
1447
with contextlib.closing(self.server.child_pipe) as child_pipe:
1448
logger.info("TCP connection from: %s",
1449
unicode(self.client_address))
1450
logger.debug("Pipe FD: %d",
1451
self.server.child_pipe.fileno())
1452
1453
session = (gnutls.connection
1454
.ClientSession(self.request,
1455
gnutls.connection
1456
.X509Credentials()))
1457
1458
# Note: gnutls.connection.X509Credentials is really a
1459
# generic GnuTLS certificate credentials object so long as
1460
# no X.509 keys are added to it. Therefore, we can use it
1461
# here despite using OpenPGP certificates.
1462
1463
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
1464
# "+AES-256-CBC", "+SHA1",
1465
# "+COMP-NULL", "+CTYPE-OPENPGP",
1466
# "+DHE-DSS"))
1467
# Use a fallback default, since this MUST be set.
1468
priority = self.server.gnutls_priority
1469
if priority is None:
1470
priority = "NORMAL"
1471
(gnutls.library.functions
1472
.gnutls_priority_set_direct(session._c_object,
1473
priority, None))
1474
1475
# Start communication using the Mandos protocol
1476
# Get protocol number
1477
line = self.request.makefile().readline()
1478
logger.debug("Protocol version: %r", line)
1479
try:
1480
if int(line.strip().split()[0]) > 1:
1481
raise RuntimeError
1482
except (ValueError, IndexError, RuntimeError) as error:
1483
logger.error("Unknown protocol version: %s", error)
1484
return
1485
1486
# Start GnuTLS connection
1487
try:
1488
session.handshake()
1489
except gnutls.errors.GNUTLSError as error:
1490
logger.warning("Handshake failed: %s", error)
1491
# Do not run session.bye() here: the session is not
1492
# established. Just abandon the request.
1493
return
1494
logger.debug("Handshake succeeded")
1495
1496
approval_required = False
1497
try:
1498
try:
1499
fpr = self.fingerprint(self.peer_certificate
1500
(session))
1501
except (TypeError,
1502
gnutls.errors.GNUTLSError) as error:
1503
logger.warning("Bad certificate: %s", error)
1504
return
1505
logger.debug("Fingerprint: %s", fpr)
1506
1507
try:
1508
client = ProxyClient(child_pipe, fpr,
1509
self.client_address)
1510
except KeyError:
1511
return
1512
1513
if self.server.use_dbus:
1514
# Emit D-Bus signal
1515
client.NewRequest(str(self.client_address))
1516
1517
if client.approval_delay:
1518
delay = client.approval_delay
1519
client.approvals_pending += 1
1520
approval_required = True
1521
1522
while True:
1523
if not client.enabled:
1524
logger.info("Client %s is disabled",
1525
client.name)
1526
if self.server.use_dbus:
1527
# Emit D-Bus signal
1528
client.Rejected("Disabled")
1529
return
1530
1531
if client.approved or not client.approval_delay:
1532
#We are approved or approval is disabled
1533
break
1534
elif client.approved is None:
1535
logger.info("Client %s needs approval",
1536
client.name)
1537
if self.server.use_dbus:
1538
# Emit D-Bus signal
1539
client.NeedApproval(
1540
client.approval_delay_milliseconds(),
1541
client.approved_by_default)
1542
else:
1543
logger.warning("Client %s was not approved",
1544
client.name)
1545
if self.server.use_dbus:
1546
# Emit D-Bus signal
1547
client.Rejected("Denied")
1548
return
1549
1550
#wait until timeout or approved
1551
time = datetime.datetime.now()
1552
client.changedstate.acquire()
1553
(client.changedstate.wait
1554
(float(client.timedelta_to_milliseconds(delay)
1555
/ 1000)))
1556
client.changedstate.release()
1557
time2 = datetime.datetime.now()
1558
if (time2 - time) >= delay:
1559
if not client.approved_by_default:
1560
logger.warning("Client %s timed out while"
1561
" waiting for approval",
1562
client.name)
1563
if self.server.use_dbus:
1564
# Emit D-Bus signal
1565
client.Rejected("Approval timed out")
1566
return
1567
else:
1568
break
1569
else:
1570
delay -= time2 - time
1571
1572
sent_size = 0
1573
while sent_size < len(client.secret):
1574
try:
1575
sent = session.send(client.secret[sent_size:])
1576
except gnutls.errors.GNUTLSError as error:
1577
logger.warning("gnutls send failed")
1578
return
1579
logger.debug("Sent: %d, remaining: %d",
1580
sent, len(client.secret)
1581
- (sent_size + sent))
1582
sent_size += sent
1583
1584
logger.info("Sending secret to %s", client.name)
1585
# bump the timeout using extended_timeout
1586
client.checked_ok(client.extended_timeout)
1587
if self.server.use_dbus:
1588
# Emit D-Bus signal
1589
client.GotSecret()
1590
1591
finally:
1592
if approval_required:
1593
client.approvals_pending -= 1
1594
try:
1595
session.bye()
1596
except gnutls.errors.GNUTLSError as error:
1597
logger.warning("GnuTLS bye failed")
1598
1599
@staticmethod
1600
def peer_certificate(session):
1601
"Return the peer's OpenPGP certificate as a bytestring"
1602
# If not an OpenPGP certificate...
1603
if (gnutls.library.functions
1604
.gnutls_certificate_type_get(session._c_object)
1605
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1606
# ...do the normal thing
1607
return session.peer_certificate
1608
list_size = ctypes.c_uint(1)
1609
cert_list = (gnutls.library.functions
1610
.gnutls_certificate_get_peers
1611
(session._c_object, ctypes.byref(list_size)))
1612
if not bool(cert_list) and list_size.value != 0:
1613
raise gnutls.errors.GNUTLSError("error getting peer"
1614
" certificate")
1615
if list_size.value == 0:
1616
return None
1617
cert = cert_list[0]
1618
return ctypes.string_at(cert.data, cert.size)
1619
1620
@staticmethod
1621
def fingerprint(openpgp):
1622
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1623
# New GnuTLS "datum" with the OpenPGP public key
1624
datum = (gnutls.library.types
1625
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1626
ctypes.POINTER
1627
(ctypes.c_ubyte)),
1628
ctypes.c_uint(len(openpgp))))
1629
# New empty GnuTLS certificate
1630
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1631
(gnutls.library.functions
1632
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1633
# Import the OpenPGP public key into the certificate
1634
(gnutls.library.functions
1635
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1636
gnutls.library.constants
1637
.GNUTLS_OPENPGP_FMT_RAW))
1638
# Verify the self signature in the key
1639
crtverify = ctypes.c_uint()
1640
(gnutls.library.functions
1641
.gnutls_openpgp_crt_verify_self(crt, 0,
1642
ctypes.byref(crtverify)))
1643
if crtverify.value != 0:
1644
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1645
raise (gnutls.errors.CertificateSecurityError
1646
("Verify failed"))
1647
# New buffer for the fingerprint
1648
buf = ctypes.create_string_buffer(20)
1649
buf_len = ctypes.c_size_t()
1650
# Get the fingerprint from the certificate into the buffer
1651
(gnutls.library.functions
1652
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1653
ctypes.byref(buf_len)))
1654
# Deinit the certificate
1655
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1656
# Convert the buffer to a Python bytestring
1657
fpr = ctypes.string_at(buf, buf_len.value)
1658
# Convert the bytestring to hexadecimal notation
1659
hex_fpr = binascii.hexlify(fpr).upper()
1660
return hex_fpr
1661
1662
1663
class MultiprocessingMixIn(object):
1664
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1665
def sub_process_main(self, request, address):
1666
try:
1667
self.finish_request(request, address)
1668
except:
1669
self.handle_error(request, address)
1670
self.close_request(request)
1671
1672
def process_request(self, request, address):
1673
"""Start a new process to process the request."""
1674
proc = multiprocessing.Process(target = self.sub_process_main,
1675
args = (request,
1676
address))
1677
proc.start()
1678
return proc
1679
1680
1681
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1682
""" adds a pipe to the MixIn """
1683
def process_request(self, request, client_address):
1684
"""Overrides and wraps the original process_request().
1685
1686
This function creates a new pipe in self.pipe
1687
"""
1688
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1689
1690
proc = MultiprocessingMixIn.process_request(self, request,
1691
client_address)
1692
self.child_pipe.close()
1693
self.add_pipe(parent_pipe, proc)
1694
1695
def add_pipe(self, parent_pipe, proc):
1696
"""Dummy function; override as necessary"""
1697
raise NotImplementedError
1698
1699
1700
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1701
socketserver.TCPServer, object):
1702
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1703
316
logger.debug(u"TCP connection from: %s",
317
unicode(self.client_address))
318
session = gnutls.connection.ClientSession(self.request,
319
gnutls.connection.\
320
X509Credentials())
321
322
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
323
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
324
# "+DHE-DSS"))
325
priority = "SECURE256"
326
327
gnutls.library.functions.gnutls_priority_set_direct\
328
(session._c_object, priority, None);
329
330
try:
331
session.handshake()
332
except gnutls.errors.GNUTLSError, error:
333
logger.debug(u"Handshake failed: %s", error)
334
# Do not run session.bye() here: the session is not
335
# established. Just abandon the request.
336
return
337
try:
338
fpr = fingerprint(peer_certificate(session))
339
except (TypeError, gnutls.errors.GNUTLSError), error:
340
logger.debug(u"Bad certificate: %s", error)
341
session.bye()
342
return
343
logger.debug(u"Fingerprint: %s", fpr)
344
client = None
345
for c in clients:
346
if c.fingerprint == fpr:
347
client = c
348
break
349
# Have to check if client.still_valid(), since it is possible
350
# that the client timed out while establishing the GnuTLS
351
# session.
352
if (not client) or (not client.still_valid()):
353
if client:
354
logger.debug(u"Client %(name)s is invalid",
355
vars(client))
356
else:
357
logger.debug(u"Client not found for fingerprint: %s",
358
fpr)
359
session.bye()
360
return
361
sent_size = 0
362
while sent_size < len(client.secret):
363
sent = session.send(client.secret[sent_size:])
364
logger.debug(u"Sent: %d, remaining: %d",
365
sent, len(client.secret)
366
- (sent_size + sent))
367
sent_size += sent
368
session.bye()
369
370
371
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
372
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1704
373
Attributes:
1705
enabled: Boolean; whether this server is activated yet
1706
interface: None or a network interface name (string)
1707
use_ipv6: Boolean; to use IPv6 or not
374
options: Command line options
375
clients: Set() of Client objects
1708
376
"""
1709
def __init__(self, server_address, RequestHandlerClass,
1710
interface=None, use_ipv6=True):
1711
self.interface = interface
1712
if use_ipv6:
1713
self.address_family = socket.AF_INET6
1714
socketserver.TCPServer.__init__(self, server_address,
1715
RequestHandlerClass)
377
address_family = socket.AF_INET6
378
def __init__(self, *args, **kwargs):
379
if "options" in kwargs:
380
self.options = kwargs["options"]
381
del kwargs["options"]
382
if "clients" in kwargs:
383
self.clients = kwargs["clients"]
384
del kwargs["clients"]
385
return super(type(self), self).__init__(*args, **kwargs)
1716
386
def server_bind(self):
1717
387
"""This overrides the normal server_bind() function
1718
388
to bind to an interface if one was specified, and also NOT to
1719
389
bind to an address or port if they were not specified."""
1720
if self.interface is not None:
1721
if SO_BINDTODEVICE is None:
1722
logger.error("SO_BINDTODEVICE does not exist;"
1723
" cannot bind to interface %s",
1724
self.interface)
1725
else:
1726
try:
1727
self.socket.setsockopt(socket.SOL_SOCKET,
1728
SO_BINDTODEVICE,
1729
str(self.interface
1730
+ '\0'))
1731
except socket.error as error:
1732
if error[0] == errno.EPERM:
1733
logger.error("No permission to"
1734
" bind to interface %s",
1735
self.interface)
1736
elif error[0] == errno.ENOPROTOOPT:
1737
logger.error("SO_BINDTODEVICE not available;"
1738
" cannot bind to interface %s",
1739
self.interface)
1740
else:
1741
raise
390
if self.options.interface:
391
if not hasattr(socket, "SO_BINDTODEVICE"):
392
# From /usr/include/asm-i486/socket.h
393
socket.SO_BINDTODEVICE = 25
394
try:
395
self.socket.setsockopt(socket.SOL_SOCKET,
396
socket.SO_BINDTODEVICE,
397
self.options.interface)
398
except socket.error, error:
399
if error[0] == errno.EPERM:
400
logger.warning(u"No permission to"
401
u" bind to interface %s",
402
self.options.interface)
403
else:
404
raise error
1742
405
# Only bind(2) the socket if we really need to.
1743
406
if self.server_address[0] or self.server_address[1]:
1744
407
if not self.server_address[0]:
1745
if self.address_family == socket.AF_INET6:
1746
any_address = "::" # in6addr_any
1747
else:
1748
any_address = socket.INADDR_ANY
1749
self.server_address = (any_address,
408
in6addr_any = "::"
409
self.server_address = (in6addr_any,
1750
410
self.server_address[1])
1751
elif not self.server_address[1]:
411
elif self.server_address[1] is None:
1752
412
self.server_address = (self.server_address[0],
1753
413
0)
1754
# if self.interface:
1755
# self.server_address = (self.server_address[0],
1756
# 0, # port
1757
# 0, # flowinfo
1758
# if_nametoindex
1759
# (self.interface))
1760
return socketserver.TCPServer.server_bind(self)
1761
1762
1763
class MandosServer(IPv6_TCPServer):
1764
"""Mandos server.
1765
1766
Attributes:
1767
clients: set of Client objects
1768
gnutls_priority GnuTLS priority string
1769
use_dbus: Boolean; to emit D-Bus signals or not
1770
1771
Assumes a gobject.MainLoop event loop.
1772
"""
1773
def __init__(self, server_address, RequestHandlerClass,
1774
interface=None, use_ipv6=True, clients=None,
1775
gnutls_priority=None, use_dbus=True):
1776
self.enabled = False
1777
self.clients = clients
1778
if self.clients is None:
1779
self.clients = {}
1780
self.use_dbus = use_dbus
1781
self.gnutls_priority = gnutls_priority
1782
IPv6_TCPServer.__init__(self, server_address,
1783
RequestHandlerClass,
1784
interface = interface,
1785
use_ipv6 = use_ipv6)
1786
def server_activate(self):
1787
if self.enabled:
1788
return socketserver.TCPServer.server_activate(self)
1789
1790
def enable(self):
1791
self.enabled = True
1792
1793
def add_pipe(self, parent_pipe, proc):
1794
# Call "handle_ipc" for both data and EOF events
1795
gobject.io_add_watch(parent_pipe.fileno(),
1796
gobject.IO_IN | gobject.IO_HUP,
1797
functools.partial(self.handle_ipc,
1798
parent_pipe =
1799
parent_pipe,
1800
proc = proc))
1801
1802
def handle_ipc(self, source, condition, parent_pipe=None,
1803
proc = None, client_object=None):
1804
condition_names = {
1805
gobject.IO_IN: "IN", # There is data to read.
1806
gobject.IO_OUT: "OUT", # Data can be written (without
1807
# blocking).
1808
gobject.IO_PRI: "PRI", # There is urgent data to read.
1809
gobject.IO_ERR: "ERR", # Error condition.
1810
gobject.IO_HUP: "HUP" # Hung up (the connection has been
1811
# broken, usually for pipes and
1812
# sockets).
1813
}
1814
conditions_string = ' | '.join(name
1815
for cond, name in
1816
condition_names.iteritems()
1817
if cond & condition)
1818
# error, or the other end of multiprocessing.Pipe has closed
1819
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1820
# Wait for other process to exit
1821
proc.join()
1822
return False
1823
1824
# Read a request from the child
1825
request = parent_pipe.recv()
1826
command = request[0]
1827
1828
if command == 'init':
1829
fpr = request[1]
1830
address = request[2]
1831
1832
for c in self.clients.itervalues():
1833
if c.fingerprint == fpr:
1834
client = c
1835
break
1836
else:
1837
logger.info("Client not found for fingerprint: %s, ad"
1838
"dress: %s", fpr, address)
1839
if self.use_dbus:
1840
# Emit D-Bus signal
1841
mandos_dbus_service.ClientNotFound(fpr,
1842
address[0])
1843
parent_pipe.send(False)
1844
return False
1845
1846
gobject.io_add_watch(parent_pipe.fileno(),
1847
gobject.IO_IN | gobject.IO_HUP,
1848
functools.partial(self.handle_ipc,
1849
parent_pipe =
1850
parent_pipe,
1851
proc = proc,
1852
client_object =
1853
client))
1854
parent_pipe.send(True)
1855
# remove the old hook in favor of the new above hook on
1856
# same fileno
1857
return False
1858
if command == 'funcall':
1859
funcname = request[1]
1860
args = request[2]
1861
kwargs = request[3]
1862
1863
parent_pipe.send(('data', getattr(client_object,
1864
funcname)(*args,
1865
**kwargs)))
1866
1867
if command == 'getattr':
1868
attrname = request[1]
1869
if callable(client_object.__getattribute__(attrname)):
1870
parent_pipe.send(('function',))
1871
else:
1872
parent_pipe.send(('data', client_object
1873
.__getattribute__(attrname)))
1874
1875
if command == 'setattr':
1876
attrname = request[1]
1877
value = request[2]
1878
setattr(client_object, attrname, value)
1879
1880
return True
414
return super(type(self), self).server_bind()
1881
415
1882
416
1883
417
def string_to_delta(interval):
1884
418
"""Parse a string and return a datetime.timedelta
1885
419
1886
420
>>> string_to_delta('7d')
1887
421
datetime.timedelta(7)
1888
422
>>> string_to_delta('60s')
1891
425
datetime.timedelta(0, 3600)
1892
426
>>> string_to_delta('24h')
1893
427
datetime.timedelta(1)
1894
>>> string_to_delta('1w')
428
>>> string_to_delta(u'1w')
1895
429
datetime.timedelta(7)
1896
>>> string_to_delta('5m 30s')
1897
datetime.timedelta(0, 330)
1898
430
"""
1899
timevalue = datetime.timedelta(0)
1900
for s in interval.split():
1901
try:
1902
suffix = unicode(s[-1])
1903
value = int(s[:-1])
1904
if suffix == "d":
1905
delta = datetime.timedelta(value)
1906
elif suffix == "s":
1907
delta = datetime.timedelta(0, value)
1908
elif suffix == "m":
1909
delta = datetime.timedelta(0, 0, 0, 0, value)
1910
elif suffix == "h":
1911
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1912
elif suffix == "w":
1913
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1914
else:
1915
raise ValueError("Unknown suffix %r" % suffix)
1916
except (ValueError, IndexError) as e:
1917
raise ValueError(*(e.args))
1918
timevalue += delta
1919
return timevalue
1920
1921
1922
def daemon(nochdir = False, noclose = False):
431
try:
432
suffix=unicode(interval[-1])
433
value=int(interval[:-1])
434
if suffix == u"d":
435
delta = datetime.timedelta(value)
436
elif suffix == u"s":
437
delta = datetime.timedelta(0, value)
438
elif suffix == u"m":
439
delta = datetime.timedelta(0, 0, 0, 0, value)
440
elif suffix == u"h":
441
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
442
elif suffix == u"w":
443
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
444
else:
445
raise ValueError
446
except (ValueError, IndexError):
447
raise ValueError
448
return delta
449
450
451
def add_service():
452
"""From the Avahi server example code"""
453
global group, serviceName, serviceType, servicePort, serviceTXT, \
454
domain, host
455
if group is None:
456
group = dbus.Interface(
457
bus.get_object( avahi.DBUS_NAME,
458
server.EntryGroupNew()),
459
avahi.DBUS_INTERFACE_ENTRY_GROUP)
460
group.connect_to_signal('StateChanged',
461
entry_group_state_changed)
462
logger.debug(u"Adding service '%s' of type '%s' ...",
463
serviceName, serviceType)
464
465
group.AddService(
466
serviceInterface, # interface
467
avahi.PROTO_INET6, # protocol
468
dbus.UInt32(0), # flags
469
serviceName, serviceType,
470
domain, host,
471
dbus.UInt16(servicePort),
472
avahi.string_array_to_txt_array(serviceTXT))
473
group.Commit()
474
475
476
def remove_service():
477
"""From the Avahi server example code"""
478
global group
479
480
if not group is None:
481
group.Reset()
482
483
484
def server_state_changed(state):
485
"""From the Avahi server example code"""
486
if state == avahi.SERVER_COLLISION:
487
logger.warning(u"Server name collision")
488
remove_service()
489
elif state == avahi.SERVER_RUNNING:
490
add_service()
491
492
493
def entry_group_state_changed(state, error):
494
"""From the Avahi server example code"""
495
global serviceName, server, rename_count
496
497
logger.debug(u"state change: %i", state)
498
499
if state == avahi.ENTRY_GROUP_ESTABLISHED:
500
logger.debug(u"Service established.")
501
elif state == avahi.ENTRY_GROUP_COLLISION:
502
503
rename_count = rename_count - 1
504
if rename_count > 0:
505
name = server.GetAlternativeServiceName(name)
506
logger.warning(u"Service name collision, "
507
u"changing name to '%s' ...", name)
508
remove_service()
509
add_service()
510
511
else:
512
logger.error(u"No suitable service name found after %i"
513
u" retries, exiting.", n_rename)
514
killme(1)
515
elif state == avahi.ENTRY_GROUP_FAILURE:
516
logger.error(u"Error in group state changed %s",
517
unicode(error))
518
killme(1)
519
520
521
def if_nametoindex(interface):
522
"""Call the C function if_nametoindex()"""
523
try:
524
libc = ctypes.cdll.LoadLibrary("libc.so.6")
525
return libc.if_nametoindex(interface)
526
except (OSError, AttributeError):
527
if "struct" not in sys.modules:
528
import struct
529
if "fcntl" not in sys.modules:
530
import fcntl
531
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
532
s = socket.socket()
533
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
534
struct.pack("16s16x", interface))
535
s.close()
536
interface_index = struct.unpack("I", ifreq[16:20])[0]
537
return interface_index
538
539
540
def daemon(nochdir, noclose):
1923
541
"""See daemon(3). Standard BSD Unix function.
1924
1925
542
This should really exist as os.daemon, but it doesn't (yet)."""
1926
543
if os.fork():
1927
544
sys.exit()
1928
545
os.setsid()
1929
546
if not nochdir:
1930
547
os.chdir("/")
1931
if os.fork():
1932
sys.exit()
1933
548
if not noclose:
1934
549
# Close all standard open file descriptors
1935
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
550
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
1936
551
if not stat.S_ISCHR(os.fstat(null).st_mode):
1937
552
raise OSError(errno.ENODEV,
1938
"%s not a character device"
1939
% os.path.devnull)
553
"/dev/null not a character device")
1940
554
os.dup2(null, sys.stdin.fileno())
1941
555
os.dup2(null, sys.stdout.fileno())
1942
556
os.dup2(null, sys.stderr.fileno())
1944
558
os.close(null)
1945
559
1946
560
1947
def main():
1948
1949
##################################################################
1950
# Parsing of options, both command line and config file
1951
1952
parser = argparse.ArgumentParser()
1953
parser.add_argument("-v", "--version", action="version",
1954
version = "%%(prog)s %s" % version,
1955
help="show version number and exit")
1956
parser.add_argument("-i", "--interface", metavar="IF",
1957
help="Bind to interface IF")
1958
parser.add_argument("-a", "--address",
1959
help="Address to listen for requests on")
1960
parser.add_argument("-p", "--port", type=int,
1961
help="Port number to receive requests on")
1962
parser.add_argument("--check", action="store_true",
1963
help="Run self-test")
1964
parser.add_argument("--debug", action="store_true",
1965
help="Debug mode; run in foreground and log"
1966
" to terminal")
1967
parser.add_argument("--debuglevel", metavar="LEVEL",
1968
help="Debug level for stdout output")
1969
parser.add_argument("--priority", help="GnuTLS"
1970
" priority string (see GnuTLS documentation)")
1971
parser.add_argument("--servicename",
1972
metavar="NAME", help="Zeroconf service name")
1973
parser.add_argument("--configdir",
1974
default="/etc/mandos", metavar="DIR",
1975
help="Directory to search for configuration"
1976
" files")
1977
parser.add_argument("--no-dbus", action="store_false",
1978
dest="use_dbus", help="Do not provide D-Bus"
1979
" system bus interface")
1980
parser.add_argument("--no-ipv6", action="store_false",
1981
dest="use_ipv6", help="Do not use IPv6")
1982
parser.add_argument("--no-restore", action="store_false",
1983
dest="restore", help="Do not restore stored"
1984
" state")
1985
parser.add_argument("--statedir", metavar="DIR",
1986
help="Directory to save/restore state in")
1987
1988
options = parser.parse_args()
561
def killme(status = 0):
562
logger.debug("Stopping server with exit status %d", status)
563
exitstatus = status
564
if main_loop_started:
565
main_loop.quit()
566
else:
567
sys.exit(status)
568
569
570
if __name__ == '__main__':
571
exitstatus = 0
572
main_loop_started = False
573
parser = OptionParser()
574
parser.add_option("-i", "--interface", type="string",
575
default=None, metavar="IF",
576
help="Bind to interface IF")
577
parser.add_option("-p", "--port", type="int", default=None,
578
help="Port number to receive requests on")
579
parser.add_option("--timeout", type="string", # Parsed later
580
default="1h",
581
help="Amount of downtime allowed for clients")
582
parser.add_option("--interval", type="string", # Parsed later
583
default="5m",
584
help="How often to check that a client is up")
585
parser.add_option("--check", action="store_true", default=False,
586
help="Run self-test")
587
parser.add_option("--debug", action="store_true", default=False,
588
help="Debug mode")
589
(options, args) = parser.parse_args()
1989
590
1990
591
if options.check:
1991
592
import doctest
1992
593
doctest.testmod()
1993
594
sys.exit()
1994
595
1995
# Default values for config file for server-global settings
1996
server_defaults = { "interface": "",
1997
"address": "",
1998
"port": "",
1999
"debug": "False",
2000
"priority":
2001
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
2002
"servicename": "Mandos",
2003
"use_dbus": "True",
2004
"use_ipv6": "True",
2005
"debuglevel": "",
2006
"restore": "True",
2007
"statedir": "/var/lib/mandos"
2008
}
2009
2010
# Parse config file for server-global settings
2011
server_config = configparser.SafeConfigParser(server_defaults)
2012
del server_defaults
2013
server_config.read(os.path.join(options.configdir,
2014
"mandos.conf"))
2015
# Convert the SafeConfigParser object to a dict
2016
server_settings = server_config.defaults()
2017
# Use the appropriate methods on the non-string config options
2018
for option in ("debug", "use_dbus", "use_ipv6"):
2019
server_settings[option] = server_config.getboolean("DEFAULT",
2020
option)
2021
if server_settings["port"]:
2022
server_settings["port"] = server_config.getint("DEFAULT",
2023
"port")
2024
del server_config
2025
2026
# Override the settings from the config file with command line
2027
# options, if set.
2028
for option in ("interface", "address", "port", "debug",
2029
"priority", "servicename", "configdir",
2030
"use_dbus", "use_ipv6", "debuglevel", "restore",
2031
"statedir"):
2032
value = getattr(options, option)
2033
if value is not None:
2034
server_settings[option] = value
2035
del options
2036
# Force all strings to be unicode
2037
for option in server_settings.keys():
2038
if type(server_settings[option]) is str:
2039
server_settings[option] = unicode(server_settings[option])
2040
# Now we have our good server settings in "server_settings"
2041
2042
##################################################################
2043
2044
# For convenience
2045
debug = server_settings["debug"]
2046
debuglevel = server_settings["debuglevel"]
2047
use_dbus = server_settings["use_dbus"]
2048
use_ipv6 = server_settings["use_ipv6"]
2049
stored_state_path = os.path.join(server_settings["statedir"],
2050
stored_state_file)
2051
2052
if debug:
2053
initlogger(logging.DEBUG)
2054
else:
2055
if not debuglevel:
2056
initlogger()
2057
else:
2058
level = getattr(logging, debuglevel.upper())
2059
initlogger(level)
2060
2061
if server_settings["servicename"] != "Mandos":
2062
syslogger.setFormatter(logging.Formatter
2063
('Mandos (%s) [%%(process)d]:'
2064
' %%(levelname)s: %%(message)s'
2065
% server_settings["servicename"]))
2066
2067
# Parse config file with clients
2068
client_defaults = { "timeout": "5m",
2069
"extended_timeout": "15m",
2070
"interval": "2m",
2071
"checker": "fping -q -- %%(host)s",
2072
"host": "",
2073
"approval_delay": "0s",
2074
"approval_duration": "1s",
2075
}
2076
client_config = configparser.SafeConfigParser(client_defaults)
2077
client_config.read(os.path.join(server_settings["configdir"],
2078
"clients.conf"))
2079
2080
global mandos_dbus_service
2081
mandos_dbus_service = None
2082
2083
tcp_server = MandosServer((server_settings["address"],
2084
server_settings["port"]),
2085
ClientHandler,
2086
interface=(server_settings["interface"]
2087
or None),
2088
use_ipv6=use_ipv6,
2089
gnutls_priority=
2090
server_settings["priority"],
2091
use_dbus=use_dbus)
2092
if not debug:
2093
pidfilename = "/var/run/mandos.pid"
2094
try:
2095
pidfile = open(pidfilename, "w")
2096
except IOError:
2097
logger.error("Could not open file %r", pidfilename)
2098
2099
try:
2100
uid = pwd.getpwnam("_mandos").pw_uid
2101
gid = pwd.getpwnam("_mandos").pw_gid
2102
except KeyError:
2103
try:
2104
uid = pwd.getpwnam("mandos").pw_uid
2105
gid = pwd.getpwnam("mandos").pw_gid
2106
except KeyError:
2107
try:
2108
uid = pwd.getpwnam("nobody").pw_uid
2109
gid = pwd.getpwnam("nobody").pw_gid
2110
except KeyError:
2111
uid = 65534
2112
gid = 65534
2113
try:
2114
os.setgid(gid)
2115
os.setuid(uid)
2116
except OSError as error:
2117
if error[0] != errno.EPERM:
2118
raise error
2119
2120
if debug:
2121
# Enable all possible GnuTLS debugging
2122
2123
# "Use a log level over 10 to enable all debugging options."
2124
# - GnuTLS manual
2125
gnutls.library.functions.gnutls_global_set_log_level(11)
2126
2127
@gnutls.library.types.gnutls_log_func
2128
def debug_gnutls(level, string):
2129
logger.debug("GnuTLS: %s", string[:-1])
2130
2131
(gnutls.library.functions
2132
.gnutls_global_set_log_function(debug_gnutls))
2133
2134
# Redirect stdin so all checkers get /dev/null
2135
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2136
os.dup2(null, sys.stdin.fileno())
2137
if null > 2:
2138
os.close(null)
2139
else:
2140
# No console logging
2141
logger.removeHandler(console)
2142
2143
# Need to fork before connecting to D-Bus
2144
if not debug:
2145
# Close all input and output, do double fork, etc.
2146
daemon()
2147
2148
global main_loop
2149
# From the Avahi example code
596
# Parse the time arguments
597
try:
598
options.timeout = string_to_delta(options.timeout)
599
except ValueError:
600
parser.error("option --timeout: Unparseable time")
601
try:
602
options.interval = string_to_delta(options.interval)
603
except ValueError:
604
parser.error("option --interval: Unparseable time")
605
606
# Parse config file
607
defaults = { "checker": "fping -q -- %%(fqdn)s" }
608
client_config = ConfigParser.SafeConfigParser(defaults)
609
#client_config.readfp(open("secrets.conf"), "secrets.conf")
610
client_config.read("mandos-clients.conf")
611
612
# From the Avahi server example code
2150
613
DBusGMainLoop(set_as_default=True )
2151
614
main_loop = gobject.MainLoop()
2152
615
bus = dbus.SystemBus()
616
server = dbus.Interface(
617
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
618
avahi.DBUS_INTERFACE_SERVER )
2153
619
# End of Avahi example code
2154
if use_dbus:
2155
try:
2156
bus_name = dbus.service.BusName("se.recompile.Mandos",
2157
bus, do_not_queue=True)
2158
old_bus_name = (dbus.service.BusName
2159
("se.bsnet.fukt.Mandos", bus,
2160
do_not_queue=True))
2161
except dbus.exceptions.NameExistsException as e:
2162
logger.error(unicode(e) + ", disabling D-Bus")
2163
use_dbus = False
2164
server_settings["use_dbus"] = False
2165
tcp_server.use_dbus = False
2166
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2167
service = AvahiServiceToSyslog(name =
2168
server_settings["servicename"],
2169
servicetype = "_mandos._tcp",
2170
protocol = protocol, bus = bus)
2171
if server_settings["interface"]:
2172
service.interface = (if_nametoindex
2173
(str(server_settings["interface"])))
2174
2175
global multiprocessing_manager
2176
multiprocessing_manager = multiprocessing.Manager()
2177
2178
client_class = Client
2179
if use_dbus:
2180
client_class = functools.partial(ClientDBusTransitional,
2181
bus = bus)
2182
2183
special_settings = {
2184
# Some settings need to be accessd by special methods;
2185
# booleans need .getboolean(), etc. Here is a list of them:
2186
"approved_by_default":
2187
lambda section:
2188
client_config.getboolean(section, "approved_by_default"),
2189
"enabled":
2190
lambda section:
2191
client_config.getboolean(section, "enabled"),
2192
}
2193
# Construct a new dict of client settings of this form:
2194
# { client_name: {setting_name: value, ...}, ...}
2195
# with exceptions for any special settings as defined above
2196
client_settings = dict((clientname,
2197
dict((setting,
2198
(value
2199
if setting not in special_settings
2200
else special_settings[setting]
2201
(clientname)))
2202
for setting, value in
2203
client_config.items(clientname)))
2204
for clientname in client_config.sections())
2205
2206
old_client_settings = {}
2207
clients_data = []
2208
2209
# Get client data and settings from last running state.
2210
if server_settings["restore"]:
2211
try:
2212
with open(stored_state_path, "rb") as stored_state:
2213
clients_data, old_client_settings = (pickle.load
2214
(stored_state))
2215
os.remove(stored_state_path)
2216
except IOError as e:
2217
logger.warning("Could not load persistent state: {0}"
2218
.format(e))
2219
if e.errno != errno.ENOENT:
2220
raise
2221
2222
with PGPEngine() as pgp:
2223
for client in clients_data:
2224
client_name = client["name"]
2225
2226
# Decide which value to use after restoring saved state.
2227
# We have three different values: Old config file,
2228
# new config file, and saved state.
2229
# New config value takes precedence if it differs from old
2230
# config value, otherwise use saved state.
2231
for name, value in client_settings[client_name].items():
2232
try:
2233
# For each value in new config, check if it
2234
# differs from the old config value (Except for
2235
# the "secret" attribute)
2236
if (name != "secret" and
2237
value != old_client_settings[client_name]
2238
[name]):
2239
setattr(client, name, value)
2240
except KeyError:
2241
pass
2242
2243
# Clients who has passed its expire date can still be
2244
# enabled if its last checker was sucessful. Clients
2245
# whose checker failed before we stored its state is
2246
# assumed to have failed all checkers during downtime.
2247
if client["enabled"]:
2248
if client["expires"] <= (datetime.datetime
2249
.utcnow()):
2250
# Client has expired
2251
if client["last_checker_status"] != 0:
2252
client["enabled"] = False
2253
else:
2254
client["expires"] = (datetime.datetime
2255
.utcnow()
2256
+ client["timeout"])
2257
2258
client["changedstate"] = (multiprocessing_manager
2259
.Condition
2260
(multiprocessing_manager
2261
.Lock()))
2262
if use_dbus:
2263
new_client = (ClientDBusTransitional.__new__
2264
(ClientDBusTransitional))
2265
tcp_server.clients[client_name] = new_client
2266
new_client.bus = bus
2267
for name, value in client.iteritems():
2268
setattr(new_client, name, value)
2269
client_object_name = unicode(client_name).translate(
2270
{ord("."): ord("_"),
2271
ord("-"): ord("_")})
2272
new_client.dbus_object_path = (dbus.ObjectPath
2273
("/clients/"
2274
+ client_object_name))
2275
DBusObjectWithProperties.__init__(new_client,
2276
new_client.bus,
2277
new_client
2278
.dbus_object_path)
2279
else:
2280
tcp_server.clients[client_name] = (Client.__new__
2281
(Client))
2282
for name, value in client.iteritems():
2283
setattr(tcp_server.clients[client_name],
2284
name, value)
2285
2286
try:
2287
tcp_server.clients[client_name].secret = (
2288
pgp.decrypt(tcp_server.clients[client_name]
2289
.encrypted_secret,
2290
client_settings[client_name]
2291
["secret"]))
2292
except PGPError:
2293
# If decryption fails, we use secret from new settings
2294
logger.debug("Failed to decrypt {0} old secret"
2295
.format(client_name))
2296
tcp_server.clients[client_name].secret = (
2297
client_settings[client_name]["secret"])
2298
2299
# Create/remove clients based on new changes made to config
2300
for clientname in set(old_client_settings) - set(client_settings):
2301
del tcp_server.clients[clientname]
2302
for clientname in set(client_settings) - set(old_client_settings):
2303
tcp_server.clients[clientname] = (client_class(name
2304
= clientname,
2305
config =
2306
client_settings
2307
[clientname]))
2308
2309
if not tcp_server.clients:
2310
logger.warning("No clients defined")
2311
620
621
debug = options.debug
622
623
if debug:
624
console = logging.StreamHandler()
625
# console.setLevel(logging.DEBUG)
626
console.setFormatter(logging.Formatter\
627
('%(levelname)s: %(message)s'))
628
logger.addHandler(console)
629
del console
630
631
clients = Set()
632
def remove_from_clients(client):
633
clients.remove(client)
634
if not clients:
635
logger.debug(u"No clients left, exiting")
636
killme()
637
638
clients.update(Set(Client(name=section, options=options,
639
stop_hook = remove_from_clients,
640
**(dict(client_config\
641
.items(section))))
642
for section in client_config.sections()))
643
2312
644
if not debug:
2313
try:
2314
with pidfile:
2315
pid = os.getpid()
2316
pidfile.write(str(pid) + "\n".encode("utf-8"))
2317
del pidfile
2318
except IOError:
2319
logger.error("Could not write to file %r with PID %d",
2320
pidfilename, pid)
2321
except NameError:
2322
# "pidfile" was never created
2323
pass
2324
del pidfilename
2325
2326
signal.signal(signal.SIGINT, signal.SIG_IGN)
2327
2328
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2329
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2330
2331
if use_dbus:
2332
class MandosDBusService(dbus.service.Object):
2333
"""A D-Bus proxy object"""
2334
def __init__(self):
2335
dbus.service.Object.__init__(self, bus, "/")
2336
_interface = "se.recompile.Mandos"
2337
2338
@dbus.service.signal(_interface, signature="o")
2339
def ClientAdded(self, objpath):
2340
"D-Bus signal"
2341
pass
2342
2343
@dbus.service.signal(_interface, signature="ss")
2344
def ClientNotFound(self, fingerprint, address):
2345
"D-Bus signal"
2346
pass
2347
2348
@dbus.service.signal(_interface, signature="os")
2349
def ClientRemoved(self, objpath, name):
2350
"D-Bus signal"
2351
pass
2352
2353
@dbus.service.method(_interface, out_signature="ao")
2354
def GetAllClients(self):
2355
"D-Bus method"
2356
return dbus.Array(c.dbus_object_path
2357
for c in
2358
tcp_server.clients.itervalues())
2359
2360
@dbus.service.method(_interface,
2361
out_signature="a{oa{sv}}")
2362
def GetAllClientsWithProperties(self):
2363
"D-Bus method"
2364
return dbus.Dictionary(
2365
((c.dbus_object_path, c.GetAll(""))
2366
for c in tcp_server.clients.itervalues()),
2367
signature="oa{sv}")
2368
2369
@dbus.service.method(_interface, in_signature="o")
2370
def RemoveClient(self, object_path):
2371
"D-Bus method"
2372
for c in tcp_server.clients.itervalues():
2373
if c.dbus_object_path == object_path:
2374
del tcp_server.clients[c.name]
2375
c.remove_from_connection()
2376
# Don't signal anything except ClientRemoved
2377
c.disable(quiet=True)
2378
# Emit D-Bus signal
2379
self.ClientRemoved(object_path, c.name)
2380
return
2381
raise KeyError(object_path)
2382
2383
del _interface
2384
2385
class MandosDBusServiceTransitional(MandosDBusService):
2386
__metaclass__ = AlternateDBusNamesMetaclass
2387
mandos_dbus_service = MandosDBusServiceTransitional()
645
daemon(False, False)
2388
646
2389
647
def cleanup():
2390
648
"Cleanup function; run on exit"
2391
service.cleanup()
2392
2393
multiprocessing.active_children()
2394
if not (tcp_server.clients or client_settings):
2395
return
2396
2397
# Store client before exiting. Secrets are encrypted with key
2398
# based on what config file has. If config file is
2399
# removed/edited, old secret will thus be unrecovable.
2400
clients = []
2401
with PGPEngine() as pgp:
2402
for client in tcp_server.clients.itervalues():
2403
key = client_settings[client.name]["secret"]
2404
client.encrypted_secret = pgp.encrypt(client.secret,
2405
key)
2406
client_dict = {}
2407
2408
# A list of attributes that will not be stored when
2409
# shutting down.
2410
exclude = set(("bus", "changedstate", "secret"))
2411
for name, typ in (inspect.getmembers
2412
(dbus.service.Object)):
2413
exclude.add(name)
2414
2415
client_dict["encrypted_secret"] = (client
2416
.encrypted_secret)
2417
for attr in client.client_structure:
2418
if attr not in exclude:
2419
client_dict[attr] = getattr(client, attr)
2420
2421
clients.append(client_dict)
2422
del client_settings[client.name]["secret"]
2423
2424
try:
2425
with os.fdopen(os.open(stored_state_path,
2426
os.O_CREAT|os.O_WRONLY|os.O_TRUNC,
2427
0600), "wb") as stored_state:
2428
pickle.dump((clients, client_settings), stored_state)
2429
except (IOError, OSError) as e:
2430
logger.warning("Could not save persistent state: {0}"
2431
.format(e))
2432
if e.errno not in (errno.ENOENT, errno.EACCES):
2433
raise
2434
2435
# Delete all clients, and settings from config
2436
while tcp_server.clients:
2437
name, client = tcp_server.clients.popitem()
2438
if use_dbus:
2439
client.remove_from_connection()
2440
# Don't signal anything except ClientRemoved
2441
client.disable(quiet=True)
2442
if use_dbus:
2443
# Emit D-Bus signal
2444
mandos_dbus_service.ClientRemoved(client
2445
.dbus_object_path,
2446
client.name)
2447
client_settings.clear()
649
global group
650
# From the Avahi server example code
651
if not group is None:
652
group.Free()
653
group = None
654
# End of Avahi example code
655
656
for client in clients:
657
client.stop_hook = None
658
client.stop()
2448
659
2449
660
atexit.register(cleanup)
2450
661
2451
for client in tcp_server.clients.itervalues():
2452
if use_dbus:
2453
# Emit D-Bus signal
2454
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2455
# Need to initiate checking of clients
2456
if client.enabled:
2457
client.init_checker()
2458
2459
tcp_server.enable()
2460
tcp_server.server_activate()
2461
2462
# Find out what port we got
2463
service.port = tcp_server.socket.getsockname()[1]
2464
if use_ipv6:
2465
logger.info("Now listening on address %r, port %d,"
2466
" flowinfo %d, scope_id %d"
2467
% tcp_server.socket.getsockname())
2468
else: # IPv4
2469
logger.info("Now listening on address %r, port %d"
2470
% tcp_server.socket.getsockname())
2471
2472
#service.interface = tcp_server.socket.getsockname()[3]
2473
2474
try:
2475
# From the Avahi example code
2476
try:
2477
service.activate()
2478
except dbus.exceptions.DBusException as error:
2479
logger.critical("DBusException: %s", error)
2480
cleanup()
2481
sys.exit(1)
2482
# End of Avahi example code
2483
2484
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2485
lambda *args, **kwargs:
2486
(tcp_server.handle_request
2487
(*args[2:], **kwargs) or True))
2488
2489
logger.debug("Starting main loop")
662
if not debug:
663
signal.signal(signal.SIGINT, signal.SIG_IGN)
664
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
665
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
666
667
for client in clients:
668
client.start()
669
670
tcp_server = IPv6_TCPServer((None, options.port),
671
tcp_handler,
672
options=options,
673
clients=clients)
674
# Find out what random port we got
675
servicePort = tcp_server.socket.getsockname()[1]
676
logger.debug(u"Now listening on port %d", servicePort)
677
678
if options.interface is not None:
679
serviceInterface = if_nametoindex(options.interface)
680
681
# From the Avahi server example code
682
server.connect_to_signal("StateChanged", server_state_changed)
683
try:
684
server_state_changed(server.GetState())
685
except dbus.exceptions.DBusException, error:
686
logger.critical(u"DBusException: %s", error)
687
killme(1)
688
# End of Avahi example code
689
690
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
691
lambda *args, **kwargs:
692
tcp_server.handle_request(*args[2:],
693
**kwargs) or True)
694
try:
695
main_loop_started = True
2490
696
main_loop.run()
2491
except AvahiError as error:
2492
logger.critical("AvahiError: %s", error)
2493
cleanup()
2494
sys.exit(1)
2495
697
except KeyboardInterrupt:
2496
698
if debug:
2497
print("", file=sys.stderr)
2498
logger.debug("Server received KeyboardInterrupt")
2499
logger.debug("Server exiting")
2500
# Must run before the D-Bus bus name gets deregistered
2501
cleanup()
2502
2503
2504
if __name__ == '__main__':
2505
main()
699
print
700
701
sys.exit(exitstatus)
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0