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- Committer: Teddy Hogeborn
- Date: 2008-08-04 16:05:01 UTC
- mfrom: (24.1.15 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080804160501-woej7nf8amgrbc2e
* plugins.d/mandosclient.c (start_mandos_communication): Change "to"
to be a union. All users changed.
to be a union. All users changed.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add", "remove", "server_state_changed",
10
# "entry_group_state_changed", "cleanup", and "activate" in the
11
# "AvahiService" class, and some lines in "main".
9
# following functions: "AvahiService.add", "AvahiService.remove",
10
# "server_state_changed", "entry_group_state_changed", and some lines
11
# in "main".
12
12
#
13
13
# Everything else is
14
# Copyright © 2008,2009 Teddy Hogeborn
15
# Copyright © 2008,2009 Björn Påhlsson
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
#
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
25
24
# GNU General Public License for more details.
26
25
#
27
26
# 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/>.
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
30
28
#
31
29
# Contact the authors at <mandos@fukt.bsnet.se>.
32
30
#
33
31
34
from __future__ import division, with_statement, absolute_import
32
from __future__ import division
35
33
36
import SocketServer as socketserver
34
import SocketServer
37
35
import socket
38
import optparse
36
import select
37
from optparse import OptionParser
39
38
import datetime
40
39
import errno
41
40
import gnutls.crypto
44
43
import gnutls.library.functions
45
44
import gnutls.library.constants
46
45
import gnutls.library.types
47
import ConfigParser as configparser
46
import ConfigParser
48
47
import sys
49
48
import re
50
49
import os
51
50
import signal
51
from sets import Set
52
52
import subprocess
53
53
import atexit
54
54
import stat
55
55
import logging
56
56
import logging.handlers
57
import pwd
58
import contextlib
59
import struct
60
import fcntl
61
import functools
62
import cPickle as pickle
63
import multiprocessing
64
57
65
58
import dbus
66
import dbus.service
67
59
import gobject
68
60
import avahi
69
61
from dbus.mainloop.glib import DBusGMainLoop
70
62
import ctypes
71
import ctypes.util
72
import xml.dom.minidom
73
import inspect
74
75
try:
76
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
77
except AttributeError:
78
try:
79
from IN import SO_BINDTODEVICE
80
except ImportError:
81
SO_BINDTODEVICE = None
82
83
84
version = "1.0.14"
85
86
#logger = logging.getLogger(u'mandos')
87
logger = logging.Logger(u'mandos')
88
syslogger = (logging.handlers.SysLogHandler
89
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
90
address = "/dev/log"))
91
syslogger.setFormatter(logging.Formatter
92
(u'Mandos [%(process)d]: %(levelname)s:'
93
u' %(message)s'))
63
64
# Brief description of the operation of this program:
65
#
66
# This server announces itself as a Zeroconf service. Connecting
67
# clients use the TLS protocol, with the unusual quirk that this
68
# server program acts as a TLS "client" while a connecting client acts
69
# as a TLS "server". The client (acting as a TLS "server") must
70
# supply an OpenPGP certificate, and the fingerprint of this
71
# certificate is used by this server to look up (in a list read from a
72
# file at start time) which binary blob to give the client. No other
73
# authentication or authorization is done by this server.
74
75
76
logger = logging.Logger('mandos')
77
syslogger = logging.handlers.SysLogHandler\
78
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
79
syslogger.setFormatter(logging.Formatter\
80
('%(levelname)s: %(message)s'))
94
81
logger.addHandler(syslogger)
82
del syslogger
95
83
96
console = logging.StreamHandler()
97
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
98
u' %(levelname)s:'
99
u' %(message)s'))
100
logger.addHandler(console)
101
84
102
85
class AvahiError(Exception):
103
def __init__(self, value, *args, **kwargs):
86
def __init__(self, value):
104
87
self.value = value
105
super(AvahiError, self).__init__(value, *args, **kwargs)
106
def __unicode__(self):
107
return unicode(repr(self.value))
88
def __str__(self):
89
return repr(self.value)
108
90
109
91
class AvahiServiceError(AvahiError):
110
92
pass
114
96
115
97
116
98
class AvahiService(object):
117
"""An Avahi (Zeroconf) service.
118
119
Attributes:
99
"""
120
100
interface: integer; avahi.IF_UNSPEC or an interface index.
121
101
Used to optionally bind to the specified interface.
122
name: string; Example: u'Mandos'
123
type: string; Example: u'_mandos._tcp'.
124
See <http://www.dns-sd.org/ServiceTypes.html>
125
port: integer; what port to announce
126
TXT: list of strings; TXT record for the service
127
domain: string; Domain to publish on, default to .local if empty.
128
host: string; Host to publish records for, default is localhost
129
max_renames: integer; maximum number of renames
130
rename_count: integer; counter so we only rename after collisions
131
a sensible number of times
132
group: D-Bus Entry Group
133
server: D-Bus Server
134
bus: dbus.SystemBus()
102
name = string; Example: "Mandos"
103
type = string; Example: "_mandos._tcp".
104
See <http://www.dns-sd.org/ServiceTypes.html>
105
port = integer; what port to announce
106
TXT = list of strings; TXT record for the service
107
domain = string; Domain to publish on, default to .local if empty.
108
host = string; Host to publish records for, default to localhost
109
if empty.
110
max_renames = integer; maximum number of renames
111
rename_count = integer; counter so we only rename after collisions
112
a sensible number of times
135
113
"""
136
114
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
137
servicetype = None, port = None, TXT = None,
138
domain = u"", host = u"", max_renames = 32768,
139
protocol = avahi.PROTO_UNSPEC, bus = None):
115
type = None, port = None, TXT = None, domain = "",
116
host = "", max_renames = 12):
117
"""An Avahi (Zeroconf) service. """
140
118
self.interface = interface
141
119
self.name = name
142
self.type = servicetype
120
self.type = type
143
121
self.port = port
144
self.TXT = TXT if TXT is not None else []
122
if TXT is None:
123
self.TXT = []
124
else:
125
self.TXT = TXT
145
126
self.domain = domain
146
127
self.host = host
147
128
self.rename_count = 0
148
self.max_renames = max_renames
149
self.protocol = protocol
150
self.group = None # our entry group
151
self.server = None
152
self.bus = bus
153
129
def rename(self):
154
130
"""Derived from the Avahi example code"""
155
131
if self.rename_count >= self.max_renames:
156
logger.critical(u"No suitable Zeroconf service name found"
157
u" after %i retries, exiting.",
158
self.rename_count)
159
raise AvahiServiceError(u"Too many renames")
160
self.name = unicode(self.server.GetAlternativeServiceName(self.name))
161
logger.info(u"Changing Zeroconf service name to %r ...",
162
self.name)
163
syslogger.setFormatter(logging.Formatter
164
(u'Mandos (%s) [%%(process)d]:'
165
u' %%(levelname)s: %%(message)s'
166
% self.name))
132
logger.critical(u"No suitable service name found after %i"
133
u" retries, exiting.", rename_count)
134
raise AvahiServiceError("Too many renames")
135
name = server.GetAlternativeServiceName(name)
136
logger.notice(u"Changing name to %r ...", name)
167
137
self.remove()
168
try:
169
self.add()
170
except dbus.exceptions.DBusException, error:
171
logger.critical(u"DBusException: %s", error)
172
self.cleanup()
173
os._exit(1)
138
self.add()
174
139
self.rename_count += 1
175
140
def remove(self):
176
141
"""Derived from the Avahi example code"""
177
if self.group is not None:
178
self.group.Reset()
142
if group is not None:
143
group.Reset()
179
144
def add(self):
180
145
"""Derived from the Avahi example code"""
181
if self.group is None:
182
self.group = dbus.Interface(
183
self.bus.get_object(avahi.DBUS_NAME,
184
self.server.EntryGroupNew()),
185
avahi.DBUS_INTERFACE_ENTRY_GROUP)
186
self.group.connect_to_signal('StateChanged',
187
self
188
.entry_group_state_changed)
189
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
190
self.name, self.type)
191
self.group.AddService(
192
self.interface,
193
self.protocol,
194
dbus.UInt32(0), # flags
195
self.name, self.type,
196
self.domain, self.host,
197
dbus.UInt16(self.port),
198
avahi.string_array_to_txt_array(self.TXT))
199
self.group.Commit()
200
def entry_group_state_changed(self, state, error):
201
"""Derived from the Avahi example code"""
202
logger.debug(u"Avahi entry group state change: %i", state)
203
204
if state == avahi.ENTRY_GROUP_ESTABLISHED:
205
logger.debug(u"Zeroconf service established.")
206
elif state == avahi.ENTRY_GROUP_COLLISION:
207
logger.warning(u"Zeroconf service name collision.")
208
self.rename()
209
elif state == avahi.ENTRY_GROUP_FAILURE:
210
logger.critical(u"Avahi: Error in group state changed %s",
211
unicode(error))
212
raise AvahiGroupError(u"State changed: %s"
213
% unicode(error))
214
def cleanup(self):
215
"""Derived from the Avahi example code"""
216
if self.group is not None:
217
self.group.Free()
218
self.group = None
219
def server_state_changed(self, state):
220
"""Derived from the Avahi example code"""
221
logger.debug(u"Avahi server state change: %i", state)
222
if state == avahi.SERVER_COLLISION:
223
logger.error(u"Zeroconf server name collision")
224
self.remove()
225
elif state == avahi.SERVER_RUNNING:
226
self.add()
227
def activate(self):
228
"""Derived from the Avahi example code"""
229
if self.server is None:
230
self.server = dbus.Interface(
231
self.bus.get_object(avahi.DBUS_NAME,
232
avahi.DBUS_PATH_SERVER),
233
avahi.DBUS_INTERFACE_SERVER)
234
self.server.connect_to_signal(u"StateChanged",
235
self.server_state_changed)
236
self.server_state_changed(self.server.GetState())
146
global group
147
if group is None:
148
group = dbus.Interface\
149
(bus.get_object(avahi.DBUS_NAME,
150
server.EntryGroupNew()),
151
avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
group.connect_to_signal('StateChanged',
153
entry_group_state_changed)
154
logger.debug(u"Adding service '%s' of type '%s' ...",
155
service.name, service.type)
156
group.AddService(
157
self.interface, # interface
158
avahi.PROTO_INET6, # protocol
159
dbus.UInt32(0), # flags
160
self.name, self.type,
161
self.domain, self.host,
162
dbus.UInt16(self.port),
163
avahi.string_array_to_txt_array(self.TXT))
164
group.Commit()
165
166
# From the Avahi example code:
167
group = None # our entry group
168
# End of Avahi example code
237
169
238
170
239
171
class Client(object):
240
172
"""A representation of a client host served by this server.
241
242
173
Attributes:
243
name: string; from the config file, used in log messages and
244
D-Bus identifiers
174
name: string; from the config file, used in log messages
245
175
fingerprint: string (40 or 32 hexadecimal digits); used to
246
176
uniquely identify the client
247
secret: bytestring; sent verbatim (over TLS) to client
248
host: string; available for use by the checker command
249
created: datetime.datetime(); (UTC) object creation
250
last_enabled: datetime.datetime(); (UTC)
251
enabled: bool()
252
last_checked_ok: datetime.datetime(); (UTC) or None
253
timeout: datetime.timedelta(); How long from last_checked_ok
254
until this client is disabled
255
interval: datetime.timedelta(); How often to start a new checker
256
disable_hook: If set, called by disable() as disable_hook(self)
257
checker: subprocess.Popen(); a running checker process used
258
to see if the client lives.
259
'None' if no process is running.
177
secret: bytestring; sent verbatim (over TLS) to client
178
fqdn: string (FQDN); available for use by the checker command
179
created: datetime.datetime(); object creation, not client host
180
last_checked_ok: datetime.datetime() or None if not yet checked OK
181
timeout: datetime.timedelta(); How long from last_checked_ok
182
until this client is invalid
183
interval: datetime.timedelta(); How often to start a new checker
184
stop_hook: If set, called by stop() as stop_hook(self)
185
checker: subprocess.Popen(); a running checker process used
186
to see if the client lives.
187
'None' if no process is running.
260
188
checker_initiator_tag: a gobject event source tag, or None
261
disable_initiator_tag: - '' -
189
stop_initiator_tag: - '' -
262
190
checker_callback_tag: - '' -
263
191
checker_command: string; External command which is run to check if
264
192
client lives. %() expansions are done at
265
193
runtime with vars(self) as dict, so that for
266
194
instance %(name)s can be used in the command.
267
current_checker_command: string; current running checker_command
268
approved_delay: datetime.timedelta(); Time to wait for approval
269
_approved: bool(); 'None' if not yet approved/disapproved
270
approved_duration: datetime.timedelta(); Duration of one approval
195
Private attibutes:
196
_timeout: Real variable for 'timeout'
197
_interval: Real variable for 'interval'
198
_timeout_milliseconds: Used when calling gobject.timeout_add()
199
_interval_milliseconds: - '' -
271
200
"""
272
273
@staticmethod
274
def _timedelta_to_milliseconds(td):
275
"Convert a datetime.timedelta() to milliseconds"
276
return ((td.days * 24 * 60 * 60 * 1000)
277
+ (td.seconds * 1000)
278
+ (td.microseconds // 1000))
279
280
def timeout_milliseconds(self):
281
"Return the 'timeout' attribute in milliseconds"
282
return self._timedelta_to_milliseconds(self.timeout)
283
284
def interval_milliseconds(self):
285
"Return the 'interval' attribute in milliseconds"
286
return self._timedelta_to_milliseconds(self.interval)
287
288
def approved_delay_milliseconds(self):
289
return self._timedelta_to_milliseconds(self.approved_delay)
290
291
def __init__(self, name = None, disable_hook=None, config=None):
292
"""Note: the 'checker' key in 'config' sets the
293
'checker_command' attribute and *not* the 'checker'
294
attribute."""
201
def _set_timeout(self, timeout):
202
"Setter function for 'timeout' attribute"
203
self._timeout = timeout
204
self._timeout_milliseconds = ((self.timeout.days
205
* 24 * 60 * 60 * 1000)
206
+ (self.timeout.seconds * 1000)
207
+ (self.timeout.microseconds
208
// 1000))
209
timeout = property(lambda self: self._timeout,
210
_set_timeout)
211
del _set_timeout
212
def _set_interval(self, interval):
213
"Setter function for 'interval' attribute"
214
self._interval = interval
215
self._interval_milliseconds = ((self.interval.days
216
* 24 * 60 * 60 * 1000)
217
+ (self.interval.seconds
218
* 1000)
219
+ (self.interval.microseconds
220
// 1000))
221
interval = property(lambda self: self._interval,
222
_set_interval)
223
del _set_interval
224
def __init__(self, name=None, stop_hook=None, fingerprint=None,
225
secret=None, secfile=None, fqdn=None, timeout=None,
226
interval=-1, checker=None):
227
"""Note: the 'checker' argument sets the 'checker_command'
228
attribute and not the 'checker' attribute.."""
295
229
self.name = name
296
if config is None:
297
config = {}
298
230
logger.debug(u"Creating client %r", self.name)
299
# Uppercase and remove spaces from fingerprint for later
300
# comparison purposes with return value from the fingerprint()
301
# function
302
self.fingerprint = (config[u"fingerprint"].upper()
303
.replace(u" ", u""))
231
# Uppercase and remove spaces from fingerprint
232
# for later comparison purposes with return value of
233
# the fingerprint() function
234
self.fingerprint = fingerprint.upper().replace(u" ", u"")
304
235
logger.debug(u" Fingerprint: %s", self.fingerprint)
305
if u"secret" in config:
306
self.secret = config[u"secret"].decode(u"base64")
307
elif u"secfile" in config:
308
with open(os.path.expanduser(os.path.expandvars
309
(config[u"secfile"])),
310
"rb") as secfile:
311
self.secret = secfile.read()
236
if secret:
237
self.secret = secret.decode(u"base64")
238
elif secfile:
239
sf = open(secfile)
240
self.secret = sf.read()
241
sf.close()
312
242
else:
313
243
raise TypeError(u"No secret or secfile for client %s"
314
244
% self.name)
315
self.host = config.get(u"host", u"")
316
self.created = datetime.datetime.utcnow()
317
self.enabled = False
318
self.last_enabled = None
245
self.fqdn = fqdn
246
self.created = datetime.datetime.now()
319
247
self.last_checked_ok = None
320
self.timeout = string_to_delta(config[u"timeout"])
321
self.interval = string_to_delta(config[u"interval"])
322
self.disable_hook = disable_hook
248
self.timeout = string_to_delta(timeout)
249
self.interval = string_to_delta(interval)
250
self.stop_hook = stop_hook
323
251
self.checker = None
324
252
self.checker_initiator_tag = None
325
self.disable_initiator_tag = None
253
self.stop_initiator_tag = None
326
254
self.checker_callback_tag = None
327
self.checker_command = config[u"checker"]
328
self.current_checker_command = None
329
self.last_connect = None
330
self._approved = None
331
self.approved_by_default = config.get(u"approved_by_default",
332
True)
333
self.approvals_pending = 0
334
self.approved_delay = string_to_delta(
335
config[u"approved_delay"])
336
self.approved_duration = string_to_delta(
337
config[u"approved_duration"])
338
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
339
340
def send_changedstate(self):
341
self.changedstate.acquire()
342
self.changedstate.notify_all()
343
self.changedstate.release()
344
345
def enable(self):
255
self.check_command = checker
256
def start(self):
346
257
"""Start this client's checker and timeout hooks"""
347
if getattr(self, u"enabled", False):
348
# Already enabled
349
return
350
self.send_changedstate()
351
self.last_enabled = datetime.datetime.utcnow()
352
258
# Schedule a new checker to be started an 'interval' from now,
353
259
# and every interval from then on.
354
self.checker_initiator_tag = (gobject.timeout_add
355
(self.interval_milliseconds(),
356
self.start_checker))
357
# Schedule a disable() when 'timeout' has passed
358
self.disable_initiator_tag = (gobject.timeout_add
359
(self.timeout_milliseconds(),
360
self.disable))
361
self.enabled = True
260
self.checker_initiator_tag = gobject.timeout_add\
261
(self._interval_milliseconds,
262
self.start_checker)
362
263
# Also start a new checker *right now*.
363
264
self.start_checker()
364
365
def disable(self, quiet=True):
366
"""Disable this client."""
367
if not getattr(self, "enabled", False):
265
# Schedule a stop() when 'timeout' has passed
266
self.stop_initiator_tag = gobject.timeout_add\
267
(self._timeout_milliseconds,
268
self.stop)
269
def stop(self):
270
"""Stop this client.
271
The possibility that a client might be restarted is left open,
272
but not currently used."""
273
# If this client doesn't have a secret, it is already stopped.
274
if self.secret:
275
logger.debug(u"Stopping client %s", self.name)
276
self.secret = None
277
else:
368
278
return False
369
if not quiet:
370
self.send_changedstate()
371
if not quiet:
372
logger.info(u"Disabling client %s", self.name)
373
if getattr(self, u"disable_initiator_tag", False):
374
gobject.source_remove(self.disable_initiator_tag)
375
self.disable_initiator_tag = None
376
if getattr(self, u"checker_initiator_tag", False):
279
if getattr(self, "stop_initiator_tag", False):
280
gobject.source_remove(self.stop_initiator_tag)
281
self.stop_initiator_tag = None
282
if getattr(self, "checker_initiator_tag", False):
377
283
gobject.source_remove(self.checker_initiator_tag)
378
284
self.checker_initiator_tag = None
379
285
self.stop_checker()
380
if self.disable_hook:
381
self.disable_hook(self)
382
self.enabled = False
286
if self.stop_hook:
287
self.stop_hook(self)
383
288
# Do not run this again if called by a gobject.timeout_add
384
289
return False
385
386
290
def __del__(self):
387
self.disable_hook = None
388
self.disable()
389
390
def checker_callback(self, pid, condition, command):
291
self.stop_hook = None
292
self.stop()
293
def checker_callback(self, pid, condition):
391
294
"""The checker has completed, so take appropriate actions."""
295
now = datetime.datetime.now()
392
296
self.checker_callback_tag = None
393
297
self.checker = None
394
if os.WIFEXITED(condition):
395
exitstatus = os.WEXITSTATUS(condition)
396
if exitstatus == 0:
397
logger.info(u"Checker for %(name)s succeeded",
398
vars(self))
399
self.checked_ok()
400
else:
401
logger.info(u"Checker for %(name)s failed",
402
vars(self))
403
else:
298
if os.WIFEXITED(condition) \
299
and (os.WEXITSTATUS(condition) == 0):
300
logger.debug(u"Checker for %(name)s succeeded",
301
vars(self))
302
self.last_checked_ok = now
303
gobject.source_remove(self.stop_initiator_tag)
304
self.stop_initiator_tag = gobject.timeout_add\
305
(self._timeout_milliseconds,
306
self.stop)
307
elif not os.WIFEXITED(condition):
404
308
logger.warning(u"Checker for %(name)s crashed?",
405
309
vars(self))
406
407
def checked_ok(self):
408
"""Bump up the timeout for this client.
409
410
This should only be called when the client has been seen,
411
alive and well.
412
"""
413
self.last_checked_ok = datetime.datetime.utcnow()
414
gobject.source_remove(self.disable_initiator_tag)
415
self.disable_initiator_tag = (gobject.timeout_add
416
(self.timeout_milliseconds(),
417
self.disable))
418
310
else:
311
logger.debug(u"Checker for %(name)s failed",
312
vars(self))
419
313
def start_checker(self):
420
314
"""Start a new checker subprocess if one is not running.
421
422
315
If a checker already exists, leave it running and do
423
316
nothing."""
424
317
# The reason for not killing a running checker is that if we
427
320
# client would inevitably timeout, since no checker would get
428
321
# a chance to run to completion. If we instead leave running
429
322
# checkers alone, the checker would have to take more time
430
# than 'timeout' for the client to be disabled, which is as it
431
# should be.
432
433
# If a checker exists, make sure it is not a zombie
434
try:
435
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
436
except (AttributeError, OSError), error:
437
if (isinstance(error, OSError)
438
and error.errno != errno.ECHILD):
439
raise error
440
else:
441
if pid:
442
logger.warning(u"Checker was a zombie")
443
gobject.source_remove(self.checker_callback_tag)
444
self.checker_callback(pid, status,
445
self.current_checker_command)
446
# Start a new checker if needed
323
# than 'timeout' for the client to be declared invalid, which
324
# is as it should be.
447
325
if self.checker is None:
448
326
try:
449
# In case checker_command has exactly one % operator
450
command = self.checker_command % self.host
327
# In case check_command has exactly one % operator
328
command = self.check_command % self.fqdn
451
329
except TypeError:
452
330
# Escape attributes for the shell
453
escaped_attrs = dict((key,
454
re.escape(unicode(str(val),
455
errors=
456
u'replace')))
331
escaped_attrs = dict((key, re.escape(str(val)))
457
332
for key, val in
458
333
vars(self).iteritems())
459
334
try:
460
command = self.checker_command % escaped_attrs
335
command = self.check_command % escaped_attrs
461
336
except TypeError, error:
462
337
logger.error(u'Could not format string "%s":'
463
u' %s', self.checker_command, error)
338
u' %s', self.check_command, error)
464
339
return True # Try again later
465
self.current_checker_command = command
466
340
try:
467
logger.info(u"Starting checker %r for %s",
468
command, self.name)
469
# We don't need to redirect stdout and stderr, since
470
# in normal mode, that is already done by daemon(),
471
# and in debug mode we don't want to. (Stdin is
472
# always replaced by /dev/null.)
341
logger.debug(u"Starting checker %r for %s",
342
command, self.name)
473
343
self.checker = subprocess.Popen(command,
474
344
close_fds=True,
475
shell=True, cwd=u"/")
476
self.checker_callback_tag = (gobject.child_watch_add
477
(self.checker.pid,
478
self.checker_callback,
479
data=command))
480
# The checker may have completed before the gobject
481
# watch was added. Check for this.
482
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
483
if pid:
484
gobject.source_remove(self.checker_callback_tag)
485
self.checker_callback(pid, status, command)
486
except OSError, error:
345
shell=True, cwd="/")
346
self.checker_callback_tag = gobject.child_watch_add\
347
(self.checker.pid,
348
self.checker_callback)
349
except subprocess.OSError, error:
487
350
logger.error(u"Failed to start subprocess: %s",
488
351
error)
489
352
# Re-run this periodically if run by gobject.timeout_add
490
353
return True
491
492
354
def stop_checker(self):
493
355
"""Force the checker process, if any, to stop."""
494
356
if self.checker_callback_tag:
495
357
gobject.source_remove(self.checker_callback_tag)
496
358
self.checker_callback_tag = None
497
if getattr(self, u"checker", None) is None:
359
if getattr(self, "checker", None) is None:
498
360
return
499
logger.debug(u"Stopping checker for %(name)s", vars(self))
361
logger.debug("Stopping checker for %(name)s", vars(self))
500
362
try:
501
363
os.kill(self.checker.pid, signal.SIGTERM)
502
#time.sleep(0.5)
364
#os.sleep(0.5)
503
365
#if self.checker.poll() is None:
504
366
# os.kill(self.checker.pid, signal.SIGKILL)
505
367
except OSError, error:
506
368
if error.errno != errno.ESRCH: # No such process
507
369
raise
508
370
self.checker = None
509
510
def dbus_service_property(dbus_interface, signature=u"v",
511
access=u"readwrite", byte_arrays=False):
512
"""Decorators for marking methods of a DBusObjectWithProperties to
513
become properties on the D-Bus.
514
515
The decorated method will be called with no arguments by "Get"
516
and with one argument by "Set".
517
518
The parameters, where they are supported, are the same as
519
dbus.service.method, except there is only "signature", since the
520
type from Get() and the type sent to Set() is the same.
521
"""
522
# Encoding deeply encoded byte arrays is not supported yet by the
523
# "Set" method, so we fail early here:
524
if byte_arrays and signature != u"ay":
525
raise ValueError(u"Byte arrays not supported for non-'ay'"
526
u" signature %r" % signature)
527
def decorator(func):
528
func._dbus_is_property = True
529
func._dbus_interface = dbus_interface
530
func._dbus_signature = signature
531
func._dbus_access = access
532
func._dbus_name = func.__name__
533
if func._dbus_name.endswith(u"_dbus_property"):
534
func._dbus_name = func._dbus_name[:-14]
535
func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
536
return func
537
return decorator
538
539
540
class DBusPropertyException(dbus.exceptions.DBusException):
541
"""A base class for D-Bus property-related exceptions
542
"""
543
def __unicode__(self):
544
return unicode(str(self))
545
546
547
class DBusPropertyAccessException(DBusPropertyException):
548
"""A property's access permissions disallows an operation.
549
"""
550
pass
551
552
553
class DBusPropertyNotFound(DBusPropertyException):
554
"""An attempt was made to access a non-existing property.
555
"""
556
pass
557
558
559
class DBusObjectWithProperties(dbus.service.Object):
560
"""A D-Bus object with properties.
561
562
Classes inheriting from this can use the dbus_service_property
563
decorator to expose methods as D-Bus properties. It exposes the
564
standard Get(), Set(), and GetAll() methods on the D-Bus.
565
"""
566
567
@staticmethod
568
def _is_dbus_property(obj):
569
return getattr(obj, u"_dbus_is_property", False)
570
571
def _get_all_dbus_properties(self):
572
"""Returns a generator of (name, attribute) pairs
573
"""
574
return ((prop._dbus_name, prop)
575
for name, prop in
576
inspect.getmembers(self, self._is_dbus_property))
577
578
def _get_dbus_property(self, interface_name, property_name):
579
"""Returns a bound method if one exists which is a D-Bus
580
property with the specified name and interface.
581
"""
582
for name in (property_name,
583
property_name + u"_dbus_property"):
584
prop = getattr(self, name, None)
585
if (prop is None
586
or not self._is_dbus_property(prop)
587
or prop._dbus_name != property_name
588
or (interface_name and prop._dbus_interface
589
and interface_name != prop._dbus_interface)):
590
continue
591
return prop
592
# No such property
593
raise DBusPropertyNotFound(self.dbus_object_path + u":"
594
+ interface_name + u"."
595
+ property_name)
596
597
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
598
out_signature=u"v")
599
def Get(self, interface_name, property_name):
600
"""Standard D-Bus property Get() method, see D-Bus standard.
601
"""
602
prop = self._get_dbus_property(interface_name, property_name)
603
if prop._dbus_access == u"write":
604
raise DBusPropertyAccessException(property_name)
605
value = prop()
606
if not hasattr(value, u"variant_level"):
607
return value
608
return type(value)(value, variant_level=value.variant_level+1)
609
610
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
611
def Set(self, interface_name, property_name, value):
612
"""Standard D-Bus property Set() method, see D-Bus standard.
613
"""
614
prop = self._get_dbus_property(interface_name, property_name)
615
if prop._dbus_access == u"read":
616
raise DBusPropertyAccessException(property_name)
617
if prop._dbus_get_args_options[u"byte_arrays"]:
618
# The byte_arrays option is not supported yet on
619
# signatures other than "ay".
620
if prop._dbus_signature != u"ay":
621
raise ValueError
622
value = dbus.ByteArray(''.join(unichr(byte)
623
for byte in value))
624
prop(value)
625
626
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
627
out_signature=u"a{sv}")
628
def GetAll(self, interface_name):
629
"""Standard D-Bus property GetAll() method, see D-Bus
630
standard.
631
632
Note: Will not include properties with access="write".
633
"""
634
all = {}
635
for name, prop in self._get_all_dbus_properties():
636
if (interface_name
637
and interface_name != prop._dbus_interface):
638
# Interface non-empty but did not match
639
continue
640
# Ignore write-only properties
641
if prop._dbus_access == u"write":
642
continue
643
value = prop()
644
if not hasattr(value, u"variant_level"):
645
all[name] = value
646
continue
647
all[name] = type(value)(value, variant_level=
648
value.variant_level+1)
649
return dbus.Dictionary(all, signature=u"sv")
650
651
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
652
out_signature=u"s",
653
path_keyword='object_path',
654
connection_keyword='connection')
655
def Introspect(self, object_path, connection):
656
"""Standard D-Bus method, overloaded to insert property tags.
657
"""
658
xmlstring = dbus.service.Object.Introspect(self, object_path,
659
connection)
660
try:
661
document = xml.dom.minidom.parseString(xmlstring)
662
def make_tag(document, name, prop):
663
e = document.createElement(u"property")
664
e.setAttribute(u"name", name)
665
e.setAttribute(u"type", prop._dbus_signature)
666
e.setAttribute(u"access", prop._dbus_access)
667
return e
668
for if_tag in document.getElementsByTagName(u"interface"):
669
for tag in (make_tag(document, name, prop)
670
for name, prop
671
in self._get_all_dbus_properties()
672
if prop._dbus_interface
673
== if_tag.getAttribute(u"name")):
674
if_tag.appendChild(tag)
675
# Add the names to the return values for the
676
# "org.freedesktop.DBus.Properties" methods
677
if (if_tag.getAttribute(u"name")
678
== u"org.freedesktop.DBus.Properties"):
679
for cn in if_tag.getElementsByTagName(u"method"):
680
if cn.getAttribute(u"name") == u"Get":
681
for arg in cn.getElementsByTagName(u"arg"):
682
if (arg.getAttribute(u"direction")
683
== u"out"):
684
arg.setAttribute(u"name", u"value")
685
elif cn.getAttribute(u"name") == u"GetAll":
686
for arg in cn.getElementsByTagName(u"arg"):
687
if (arg.getAttribute(u"direction")
688
== u"out"):
689
arg.setAttribute(u"name", u"props")
690
xmlstring = document.toxml(u"utf-8")
691
document.unlink()
692
except (AttributeError, xml.dom.DOMException,
693
xml.parsers.expat.ExpatError), error:
694
logger.error(u"Failed to override Introspection method",
695
error)
696
return xmlstring
697
698
699
class ClientDBus(Client, DBusObjectWithProperties):
700
"""A Client class using D-Bus
701
702
Attributes:
703
dbus_object_path: dbus.ObjectPath
704
bus: dbus.SystemBus()
705
"""
706
# dbus.service.Object doesn't use super(), so we can't either.
707
708
def __init__(self, bus = None, *args, **kwargs):
709
self._approvals_pending = 0
710
self.bus = bus
711
Client.__init__(self, *args, **kwargs)
712
# Only now, when this client is initialized, can it show up on
713
# the D-Bus
714
self.dbus_object_path = (dbus.ObjectPath
715
(u"/clients/"
716
+ self.name.replace(u".", u"_")))
717
DBusObjectWithProperties.__init__(self, self.bus,
718
self.dbus_object_path)
719
720
def _get_approvals_pending(self):
721
return self._approvals_pending
722
def _set_approvals_pending(self, value):
723
old_value = self._approvals_pending
724
self._approvals_pending = value
725
bval = bool(value)
726
if (hasattr(self, "dbus_object_path")
727
and bval is not bool(old_value)):
728
dbus_bool = dbus.Boolean(bval, variant_level=1)
729
self.PropertyChanged(dbus.String(u"approved_pending"),
730
dbus_bool)
731
732
approvals_pending = property(_get_approvals_pending,
733
_set_approvals_pending)
734
del _get_approvals_pending, _set_approvals_pending
735
736
@staticmethod
737
def _datetime_to_dbus(dt, variant_level=0):
738
"""Convert a UTC datetime.datetime() to a D-Bus type."""
739
return dbus.String(dt.isoformat(),
740
variant_level=variant_level)
741
742
def enable(self):
743
oldstate = getattr(self, u"enabled", False)
744
r = Client.enable(self)
745
if oldstate != self.enabled:
746
# Emit D-Bus signals
747
self.PropertyChanged(dbus.String(u"enabled"),
748
dbus.Boolean(True, variant_level=1))
749
self.PropertyChanged(
750
dbus.String(u"last_enabled"),
751
self._datetime_to_dbus(self.last_enabled,
752
variant_level=1))
753
return r
754
755
def disable(self, quiet = False):
756
oldstate = getattr(self, u"enabled", False)
757
r = Client.disable(self, quiet=quiet)
758
if not quiet and oldstate != self.enabled:
759
# Emit D-Bus signal
760
self.PropertyChanged(dbus.String(u"enabled"),
761
dbus.Boolean(False, variant_level=1))
762
return r
763
764
def __del__(self, *args, **kwargs):
765
try:
766
self.remove_from_connection()
767
except LookupError:
768
pass
769
if hasattr(DBusObjectWithProperties, u"__del__"):
770
DBusObjectWithProperties.__del__(self, *args, **kwargs)
771
Client.__del__(self, *args, **kwargs)
772
773
def checker_callback(self, pid, condition, command,
774
*args, **kwargs):
775
self.checker_callback_tag = None
776
self.checker = None
777
# Emit D-Bus signal
778
self.PropertyChanged(dbus.String(u"checker_running"),
779
dbus.Boolean(False, variant_level=1))
780
if os.WIFEXITED(condition):
781
exitstatus = os.WEXITSTATUS(condition)
782
# Emit D-Bus signal
783
self.CheckerCompleted(dbus.Int16(exitstatus),
784
dbus.Int64(condition),
785
dbus.String(command))
786
else:
787
# Emit D-Bus signal
788
self.CheckerCompleted(dbus.Int16(-1),
789
dbus.Int64(condition),
790
dbus.String(command))
791
792
return Client.checker_callback(self, pid, condition, command,
793
*args, **kwargs)
794
795
def checked_ok(self, *args, **kwargs):
796
r = Client.checked_ok(self, *args, **kwargs)
797
# Emit D-Bus signal
798
self.PropertyChanged(
799
dbus.String(u"last_checked_ok"),
800
(self._datetime_to_dbus(self.last_checked_ok,
801
variant_level=1)))
802
return r
803
804
def start_checker(self, *args, **kwargs):
805
old_checker = self.checker
806
if self.checker is not None:
807
old_checker_pid = self.checker.pid
808
else:
809
old_checker_pid = None
810
r = Client.start_checker(self, *args, **kwargs)
811
# Only if new checker process was started
812
if (self.checker is not None
813
and old_checker_pid != self.checker.pid):
814
# Emit D-Bus signal
815
self.CheckerStarted(self.current_checker_command)
816
self.PropertyChanged(
817
dbus.String(u"checker_running"),
818
dbus.Boolean(True, variant_level=1))
819
return r
820
821
def stop_checker(self, *args, **kwargs):
822
old_checker = getattr(self, u"checker", None)
823
r = Client.stop_checker(self, *args, **kwargs)
824
if (old_checker is not None
825
and getattr(self, u"checker", None) is None):
826
self.PropertyChanged(dbus.String(u"checker_running"),
827
dbus.Boolean(False, variant_level=1))
828
return r
829
830
def _reset_approved(self):
831
self._approved = None
832
return False
833
834
def approve(self, value=True):
835
self.send_changedstate()
836
self._approved = value
837
gobject.timeout_add(self._timedelta_to_milliseconds(self.approved_duration),
838
self._reset_approved)
839
840
841
## D-Bus methods, signals & properties
842
_interface = u"se.bsnet.fukt.Mandos.Client"
843
844
## Signals
845
846
# CheckerCompleted - signal
847
@dbus.service.signal(_interface, signature=u"nxs")
848
def CheckerCompleted(self, exitcode, waitstatus, command):
849
"D-Bus signal"
850
pass
851
852
# CheckerStarted - signal
853
@dbus.service.signal(_interface, signature=u"s")
854
def CheckerStarted(self, command):
855
"D-Bus signal"
856
pass
857
858
# PropertyChanged - signal
859
@dbus.service.signal(_interface, signature=u"sv")
860
def PropertyChanged(self, property, value):
861
"D-Bus signal"
862
pass
863
864
# GotSecret - signal
865
@dbus.service.signal(_interface)
866
def GotSecret(self):
867
"""D-Bus signal
868
Is sent after a successful transfer of secret from the Mandos
869
server to mandos-client
870
"""
871
pass
872
873
# Rejected - signal
874
@dbus.service.signal(_interface, signature=u"s")
875
def Rejected(self, reason):
876
"D-Bus signal"
877
pass
878
879
# NeedApproval - signal
880
@dbus.service.signal(_interface, signature=u"db")
881
def NeedApproval(self, timeout, default):
882
"D-Bus signal"
883
pass
884
885
## Methods
886
887
# Approve - method
888
@dbus.service.method(_interface, in_signature=u"b")
889
def Approve(self, value):
890
self.approve(value)
891
892
# CheckedOK - method
893
@dbus.service.method(_interface)
894
def CheckedOK(self):
895
return self.checked_ok()
896
897
# Enable - method
898
@dbus.service.method(_interface)
899
def Enable(self):
900
"D-Bus method"
901
self.enable()
902
903
# StartChecker - method
904
@dbus.service.method(_interface)
905
def StartChecker(self):
906
"D-Bus method"
907
self.start_checker()
908
909
# Disable - method
910
@dbus.service.method(_interface)
911
def Disable(self):
912
"D-Bus method"
913
self.disable()
914
915
# StopChecker - method
916
@dbus.service.method(_interface)
917
def StopChecker(self):
918
self.stop_checker()
919
920
## Properties
921
922
# approved_pending - property
923
@dbus_service_property(_interface, signature=u"b", access=u"read")
924
def approved_pending_dbus_property(self):
925
return dbus.Boolean(bool(self.approvals_pending))
926
927
# approved_by_default - property
928
@dbus_service_property(_interface, signature=u"b",
929
access=u"readwrite")
930
def approved_by_default_dbus_property(self):
931
return dbus.Boolean(self.approved_by_default)
932
933
# approved_delay - property
934
@dbus_service_property(_interface, signature=u"t",
935
access=u"readwrite")
936
def approved_delay_dbus_property(self):
937
return dbus.UInt64(self.approved_delay_milliseconds())
938
939
# approved_duration - property
940
@dbus_service_property(_interface, signature=u"t",
941
access=u"readwrite")
942
def approved_duration_dbus_property(self):
943
return dbus.UInt64(self._timedelta_to_milliseconds(
944
self.approved_duration))
945
946
# name - property
947
@dbus_service_property(_interface, signature=u"s", access=u"read")
948
def name_dbus_property(self):
949
return dbus.String(self.name)
950
951
# fingerprint - property
952
@dbus_service_property(_interface, signature=u"s", access=u"read")
953
def fingerprint_dbus_property(self):
954
return dbus.String(self.fingerprint)
955
956
# host - property
957
@dbus_service_property(_interface, signature=u"s",
958
access=u"readwrite")
959
def host_dbus_property(self, value=None):
960
if value is None: # get
961
return dbus.String(self.host)
962
self.host = value
963
# Emit D-Bus signal
964
self.PropertyChanged(dbus.String(u"host"),
965
dbus.String(value, variant_level=1))
966
967
# created - property
968
@dbus_service_property(_interface, signature=u"s", access=u"read")
969
def created_dbus_property(self):
970
return dbus.String(self._datetime_to_dbus(self.created))
971
972
# last_enabled - property
973
@dbus_service_property(_interface, signature=u"s", access=u"read")
974
def last_enabled_dbus_property(self):
975
if self.last_enabled is None:
976
return dbus.String(u"")
977
return dbus.String(self._datetime_to_dbus(self.last_enabled))
978
979
# enabled - property
980
@dbus_service_property(_interface, signature=u"b",
981
access=u"readwrite")
982
def enabled_dbus_property(self, value=None):
983
if value is None: # get
984
return dbus.Boolean(self.enabled)
985
if value:
986
self.enable()
987
else:
988
self.disable()
989
990
# last_checked_ok - property
991
@dbus_service_property(_interface, signature=u"s",
992
access=u"readwrite")
993
def last_checked_ok_dbus_property(self, value=None):
994
if value is not None:
995
self.checked_ok()
996
return
371
def still_valid(self):
372
"""Has the timeout not yet passed for this client?"""
373
now = datetime.datetime.now()
997
374
if self.last_checked_ok is None:
998
return dbus.String(u"")
999
return dbus.String(self._datetime_to_dbus(self
1000
.last_checked_ok))
1001
1002
# timeout - property
1003
@dbus_service_property(_interface, signature=u"t",
1004
access=u"readwrite")
1005
def timeout_dbus_property(self, value=None):
1006
if value is None: # get
1007
return dbus.UInt64(self.timeout_milliseconds())
1008
self.timeout = datetime.timedelta(0, 0, 0, value)
1009
# Emit D-Bus signal
1010
self.PropertyChanged(dbus.String(u"timeout"),
1011
dbus.UInt64(value, variant_level=1))
1012
if getattr(self, u"disable_initiator_tag", None) is None:
1013
return
1014
# Reschedule timeout
1015
gobject.source_remove(self.disable_initiator_tag)
1016
self.disable_initiator_tag = None
1017
time_to_die = (self.
1018
_timedelta_to_milliseconds((self
1019
.last_checked_ok
1020
+ self.timeout)
1021
- datetime.datetime
1022
.utcnow()))
1023
if time_to_die <= 0:
1024
# The timeout has passed
1025
self.disable()
1026
else:
1027
self.disable_initiator_tag = (gobject.timeout_add
1028
(time_to_die, self.disable))
1029
1030
# interval - property
1031
@dbus_service_property(_interface, signature=u"t",
1032
access=u"readwrite")
1033
def interval_dbus_property(self, value=None):
1034
if value is None: # get
1035
return dbus.UInt64(self.interval_milliseconds())
1036
self.interval = datetime.timedelta(0, 0, 0, value)
1037
# Emit D-Bus signal
1038
self.PropertyChanged(dbus.String(u"interval"),
1039
dbus.UInt64(value, variant_level=1))
1040
if getattr(self, u"checker_initiator_tag", None) is None:
1041
return
1042
# Reschedule checker run
1043
gobject.source_remove(self.checker_initiator_tag)
1044
self.checker_initiator_tag = (gobject.timeout_add
1045
(value, self.start_checker))
1046
self.start_checker() # Start one now, too
1047
1048
# checker - property
1049
@dbus_service_property(_interface, signature=u"s",
1050
access=u"readwrite")
1051
def checker_dbus_property(self, value=None):
1052
if value is None: # get
1053
return dbus.String(self.checker_command)
1054
self.checker_command = value
1055
# Emit D-Bus signal
1056
self.PropertyChanged(dbus.String(u"checker"),
1057
dbus.String(self.checker_command,
1058
variant_level=1))
1059
1060
# checker_running - property
1061
@dbus_service_property(_interface, signature=u"b",
1062
access=u"readwrite")
1063
def checker_running_dbus_property(self, value=None):
1064
if value is None: # get
1065
return dbus.Boolean(self.checker is not None)
1066
if value:
1067
self.start_checker()
1068
else:
1069
self.stop_checker()
1070
1071
# object_path - property
1072
@dbus_service_property(_interface, signature=u"o", access=u"read")
1073
def object_path_dbus_property(self):
1074
return self.dbus_object_path # is already a dbus.ObjectPath
1075
1076
# secret = property
1077
@dbus_service_property(_interface, signature=u"ay",
1078
access=u"write", byte_arrays=True)
1079
def secret_dbus_property(self, value):
1080
self.secret = str(value)
1081
1082
del _interface
1083
1084
1085
class ProxyClient(object):
1086
def __init__(self, child_pipe, fpr, address):
1087
self._pipe = child_pipe
1088
self._pipe.send(('init', fpr, address))
1089
if not self._pipe.recv():
1090
raise KeyError()
1091
1092
def __getattribute__(self, name):
1093
if(name == '_pipe'):
1094
return super(ProxyClient, self).__getattribute__(name)
1095
self._pipe.send(('getattr', name))
1096
data = self._pipe.recv()
1097
if data[0] == 'data':
1098
return data[1]
1099
if data[0] == 'function':
1100
def func(*args, **kwargs):
1101
self._pipe.send(('funcall', name, args, kwargs))
1102
return self._pipe.recv()[1]
1103
return func
1104
1105
def __setattr__(self, name, value):
1106
if(name == '_pipe'):
1107
return super(ProxyClient, self).__setattr__(name, value)
1108
self._pipe.send(('setattr', name, value))
1109
1110
1111
class ClientHandler(socketserver.BaseRequestHandler, object):
1112
"""A class to handle client connections.
1113
1114
Instantiated once for each connection to handle it.
375
return now < (self.created + self.timeout)
376
else:
377
return now < (self.last_checked_ok + self.timeout)
378
379
380
def peer_certificate(session):
381
"Return the peer's OpenPGP certificate as a bytestring"
382
# If not an OpenPGP certificate...
383
if gnutls.library.functions.gnutls_certificate_type_get\
384
(session._c_object) \
385
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
386
# ...do the normal thing
387
return session.peer_certificate
388
list_size = ctypes.c_uint()
389
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
390
(session._c_object, ctypes.byref(list_size))
391
if list_size.value == 0:
392
return None
393
cert = cert_list[0]
394
return ctypes.string_at(cert.data, cert.size)
395
396
397
def fingerprint(openpgp):
398
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
399
# New empty GnuTLS certificate
400
crt = gnutls.library.types.gnutls_openpgp_crt_t()
401
gnutls.library.functions.gnutls_openpgp_crt_init\
402
(ctypes.byref(crt))
403
# New GnuTLS "datum" with the OpenPGP public key
404
datum = gnutls.library.types.gnutls_datum_t\
405
(ctypes.cast(ctypes.c_char_p(openpgp),
406
ctypes.POINTER(ctypes.c_ubyte)),
407
ctypes.c_uint(len(openpgp)))
408
# Import the OpenPGP public key into the certificate
409
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
410
(crt,
411
ctypes.byref(datum),
412
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
413
# New buffer for the fingerprint
414
buffer = ctypes.create_string_buffer(20)
415
buffer_length = ctypes.c_size_t()
416
# Get the fingerprint from the certificate into the buffer
417
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
418
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
419
# Deinit the certificate
420
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
421
# Convert the buffer to a Python bytestring
422
fpr = ctypes.string_at(buffer, buffer_length.value)
423
# Convert the bytestring to hexadecimal notation
424
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
425
return hex_fpr
426
427
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
429
"""A TCP request handler class.
430
Instantiated by IPv6_TCPServer for each request to handle it.
1115
431
Note: This will run in its own forked process."""
1116
432
1117
433
def handle(self):
1118
with contextlib.closing(self.server.child_pipe) as child_pipe:
1119
logger.info(u"TCP connection from: %s",
1120
unicode(self.client_address))
1121
logger.debug(u"Pipe FD: %d",
1122
self.server.child_pipe.fileno())
1123
1124
session = (gnutls.connection
1125
.ClientSession(self.request,
1126
gnutls.connection
1127
.X509Credentials()))
1128
1129
# Note: gnutls.connection.X509Credentials is really a
1130
# generic GnuTLS certificate credentials object so long as
1131
# no X.509 keys are added to it. Therefore, we can use it
1132
# here despite using OpenPGP certificates.
1133
1134
#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
1135
# u"+AES-256-CBC", u"+SHA1",
1136
# u"+COMP-NULL", u"+CTYPE-OPENPGP",
1137
# u"+DHE-DSS"))
1138
# Use a fallback default, since this MUST be set.
1139
priority = self.server.gnutls_priority
1140
if priority is None:
1141
priority = u"NORMAL"
1142
(gnutls.library.functions
1143
.gnutls_priority_set_direct(session._c_object,
1144
priority, None))
1145
1146
# Start communication using the Mandos protocol
1147
# Get protocol number
1148
line = self.request.makefile().readline()
1149
logger.debug(u"Protocol version: %r", line)
1150
try:
1151
if int(line.strip().split()[0]) > 1:
1152
raise RuntimeError
1153
except (ValueError, IndexError, RuntimeError), error:
1154
logger.error(u"Unknown protocol version: %s", error)
1155
return
1156
1157
# Start GnuTLS connection
1158
try:
1159
session.handshake()
1160
except gnutls.errors.GNUTLSError, error:
1161
logger.warning(u"Handshake failed: %s", error)
1162
# Do not run session.bye() here: the session is not
1163
# established. Just abandon the request.
1164
return
1165
logger.debug(u"Handshake succeeded")
1166
1167
approval_required = False
1168
try:
1169
try:
1170
fpr = self.fingerprint(self.peer_certificate
1171
(session))
1172
except (TypeError, gnutls.errors.GNUTLSError), error:
1173
logger.warning(u"Bad certificate: %s", error)
1174
return
1175
logger.debug(u"Fingerprint: %s", fpr)
1176
1177
try:
1178
client = ProxyClient(child_pipe, fpr,
1179
self.client_address)
1180
except KeyError:
1181
return
1182
1183
if client.approved_delay:
1184
delay = client.approved_delay
1185
client.approvals_pending += 1
1186
approval_required = True
1187
1188
while True:
1189
if not client.enabled:
1190
logger.warning(u"Client %s is disabled",
1191
client.name)
1192
if self.server.use_dbus:
1193
# Emit D-Bus signal
1194
client.Rejected("Disabled")
1195
return
1196
1197
if client._approved or not client.approved_delay:
1198
#We are approved or approval is disabled
1199
break
1200
elif client._approved is None:
1201
logger.info(u"Client %s need approval",
1202
client.name)
1203
if self.server.use_dbus:
1204
# Emit D-Bus signal
1205
client.NeedApproval(
1206
client.approved_delay_milliseconds(),
1207
client.approved_by_default)
1208
else:
1209
logger.warning(u"Client %s was not approved",
1210
client.name)
1211
if self.server.use_dbus:
1212
# Emit D-Bus signal
1213
client.Rejected("Disapproved")
1214
return
1215
1216
#wait until timeout or approved
1217
#x = float(client._timedelta_to_milliseconds(delay))
1218
time = datetime.datetime.now()
1219
client.changedstate.acquire()
1220
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1221
client.changedstate.release()
1222
time2 = datetime.datetime.now()
1223
if (time2 - time) >= delay:
1224
if not client.approved_by_default:
1225
logger.warning("Client %s timed out while"
1226
" waiting for approval",
1227
client.name)
1228
if self.server.use_dbus:
1229
# Emit D-Bus signal
1230
client.Rejected("Approval timed out")
1231
return
1232
else:
1233
break
1234
else:
1235
delay -= time2 - time
1236
1237
sent_size = 0
1238
while sent_size < len(client.secret):
1239
try:
1240
sent = session.send(client.secret[sent_size:])
1241
except (gnutls.errors.GNUTLSError), error:
1242
logger.warning("gnutls send failed")
1243
return
1244
logger.debug(u"Sent: %d, remaining: %d",
1245
sent, len(client.secret)
1246
- (sent_size + sent))
1247
sent_size += sent
1248
1249
logger.info(u"Sending secret to %s", client.name)
1250
# bump the timeout as if seen
1251
client.checked_ok()
1252
if self.server.use_dbus:
1253
# Emit D-Bus signal
1254
client.GotSecret()
1255
1256
finally:
1257
if approval_required:
1258
client.approvals_pending -= 1
1259
try:
1260
session.bye()
1261
except (gnutls.errors.GNUTLSError), error:
1262
logger.warning("gnutls bye failed")
1263
1264
@staticmethod
1265
def peer_certificate(session):
1266
"Return the peer's OpenPGP certificate as a bytestring"
1267
# If not an OpenPGP certificate...
1268
if (gnutls.library.functions
1269
.gnutls_certificate_type_get(session._c_object)
1270
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1271
# ...do the normal thing
1272
return session.peer_certificate
1273
list_size = ctypes.c_uint(1)
1274
cert_list = (gnutls.library.functions
1275
.gnutls_certificate_get_peers
1276
(session._c_object, ctypes.byref(list_size)))
1277
if not bool(cert_list) and list_size.value != 0:
1278
raise gnutls.errors.GNUTLSError(u"error getting peer"
1279
u" certificate")
1280
if list_size.value == 0:
1281
return None
1282
cert = cert_list[0]
1283
return ctypes.string_at(cert.data, cert.size)
1284
1285
@staticmethod
1286
def fingerprint(openpgp):
1287
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1288
# New GnuTLS "datum" with the OpenPGP public key
1289
datum = (gnutls.library.types
1290
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1291
ctypes.POINTER
1292
(ctypes.c_ubyte)),
1293
ctypes.c_uint(len(openpgp))))
1294
# New empty GnuTLS certificate
1295
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1296
(gnutls.library.functions
1297
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1298
# Import the OpenPGP public key into the certificate
1299
(gnutls.library.functions
1300
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1301
gnutls.library.constants
1302
.GNUTLS_OPENPGP_FMT_RAW))
1303
# Verify the self signature in the key
1304
crtverify = ctypes.c_uint()
1305
(gnutls.library.functions
1306
.gnutls_openpgp_crt_verify_self(crt, 0,
1307
ctypes.byref(crtverify)))
1308
if crtverify.value != 0:
1309
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1310
raise (gnutls.errors.CertificateSecurityError
1311
(u"Verify failed"))
1312
# New buffer for the fingerprint
1313
buf = ctypes.create_string_buffer(20)
1314
buf_len = ctypes.c_size_t()
1315
# Get the fingerprint from the certificate into the buffer
1316
(gnutls.library.functions
1317
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1318
ctypes.byref(buf_len)))
1319
# Deinit the certificate
1320
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1321
# Convert the buffer to a Python bytestring
1322
fpr = ctypes.string_at(buf, buf_len.value)
1323
# Convert the bytestring to hexadecimal notation
1324
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1325
return hex_fpr
1326
1327
1328
class MultiprocessingMixIn(object):
1329
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1330
def sub_process_main(self, request, address):
1331
try:
1332
self.finish_request(request, address)
1333
except:
1334
self.handle_error(request, address)
1335
self.close_request(request)
1336
1337
def process_request(self, request, address):
1338
"""Start a new process to process the request."""
1339
multiprocessing.Process(target = self.sub_process_main,
1340
args = (request, address)).start()
1341
1342
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1343
""" adds a pipe to the MixIn """
1344
def process_request(self, request, client_address):
1345
"""Overrides and wraps the original process_request().
1346
1347
This function creates a new pipe in self.pipe
1348
"""
1349
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1350
1351
super(MultiprocessingMixInWithPipe,
1352
self).process_request(request, client_address)
1353
self.child_pipe.close()
1354
self.add_pipe(parent_pipe)
1355
1356
def add_pipe(self, parent_pipe):
1357
"""Dummy function; override as necessary"""
1358
pass
1359
1360
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1361
socketserver.TCPServer, object):
1362
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1363
434
logger.debug(u"TCP connection from: %s",
435
unicode(self.client_address))
436
session = gnutls.connection.ClientSession\
437
(self.request, gnutls.connection.X509Credentials())
438
439
line = self.request.makefile().readline()
440
logger.debug(u"Protocol version: %r", line)
441
try:
442
if int(line.strip().split()[0]) > 1:
443
raise RuntimeError
444
except (ValueError, IndexError, RuntimeError), error:
445
logger.error(u"Unknown protocol version: %s", error)
446
return
447
448
# Note: gnutls.connection.X509Credentials is really a generic
449
# GnuTLS certificate credentials object so long as no X.509
450
# keys are added to it. Therefore, we can use it here despite
451
# using OpenPGP certificates.
452
453
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
454
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
455
# "+DHE-DSS"))
456
priority = "NORMAL" # Fallback default, since this
457
# MUST be set.
458
if self.server.settings["priority"]:
459
priority = self.server.settings["priority"]
460
gnutls.library.functions.gnutls_priority_set_direct\
461
(session._c_object, priority, None);
462
463
try:
464
session.handshake()
465
except gnutls.errors.GNUTLSError, error:
466
logger.debug(u"Handshake failed: %s", error)
467
# Do not run session.bye() here: the session is not
468
# established. Just abandon the request.
469
return
470
try:
471
fpr = fingerprint(peer_certificate(session))
472
except (TypeError, gnutls.errors.GNUTLSError), error:
473
logger.debug(u"Bad certificate: %s", error)
474
session.bye()
475
return
476
logger.debug(u"Fingerprint: %s", fpr)
477
client = None
478
for c in self.server.clients:
479
if c.fingerprint == fpr:
480
client = c
481
break
482
if not client:
483
logger.debug(u"Client not found for fingerprint: %s", fpr)
484
session.bye()
485
return
486
# Have to check if client.still_valid(), since it is possible
487
# that the client timed out while establishing the GnuTLS
488
# session.
489
if not client.still_valid():
490
logger.debug(u"Client %(name)s is invalid", vars(client))
491
session.bye()
492
return
493
sent_size = 0
494
while sent_size < len(client.secret):
495
sent = session.send(client.secret[sent_size:])
496
logger.debug(u"Sent: %d, remaining: %d",
497
sent, len(client.secret)
498
- (sent_size + sent))
499
sent_size += sent
500
session.bye()
501
502
503
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
504
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1364
505
Attributes:
1365
enabled: Boolean; whether this server is activated yet
1366
interface: None or a network interface name (string)
1367
use_ipv6: Boolean; to use IPv6 or not
506
settings: Server settings
507
clients: Set() of Client objects
1368
508
"""
1369
def __init__(self, server_address, RequestHandlerClass,
1370
interface=None, use_ipv6=True):
1371
self.interface = interface
1372
if use_ipv6:
1373
self.address_family = socket.AF_INET6
1374
socketserver.TCPServer.__init__(self, server_address,
1375
RequestHandlerClass)
509
address_family = socket.AF_INET6
510
def __init__(self, *args, **kwargs):
511
if "settings" in kwargs:
512
self.settings = kwargs["settings"]
513
del kwargs["settings"]
514
if "clients" in kwargs:
515
self.clients = kwargs["clients"]
516
del kwargs["clients"]
517
return super(type(self), self).__init__(*args, **kwargs)
1376
518
def server_bind(self):
1377
519
"""This overrides the normal server_bind() function
1378
520
to bind to an interface if one was specified, and also NOT to
1379
521
bind to an address or port if they were not specified."""
1380
if self.interface is not None:
1381
if SO_BINDTODEVICE is None:
1382
logger.error(u"SO_BINDTODEVICE does not exist;"
1383
u" cannot bind to interface %s",
1384
self.interface)
1385
else:
1386
try:
1387
self.socket.setsockopt(socket.SOL_SOCKET,
1388
SO_BINDTODEVICE,
1389
str(self.interface
1390
+ u'\0'))
1391
except socket.error, error:
1392
if error[0] == errno.EPERM:
1393
logger.error(u"No permission to"
1394
u" bind to interface %s",
1395
self.interface)
1396
elif error[0] == errno.ENOPROTOOPT:
1397
logger.error(u"SO_BINDTODEVICE not available;"
1398
u" cannot bind to interface %s",
1399
self.interface)
1400
else:
1401
raise
522
if self.settings["interface"]:
523
# 25 is from /usr/include/asm-i486/socket.h
524
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
525
try:
526
self.socket.setsockopt(socket.SOL_SOCKET,
527
SO_BINDTODEVICE,
528
self.settings["interface"])
529
except socket.error, error:
530
if error[0] == errno.EPERM:
531
logger.warning(u"No permission to"
532
u" bind to interface %s",
533
self.settings["interface"])
534
else:
535
raise error
1402
536
# Only bind(2) the socket if we really need to.
1403
537
if self.server_address[0] or self.server_address[1]:
1404
538
if not self.server_address[0]:
1405
if self.address_family == socket.AF_INET6:
1406
any_address = u"::" # in6addr_any
1407
else:
1408
any_address = socket.INADDR_ANY
1409
self.server_address = (any_address,
539
in6addr_any = "::"
540
self.server_address = (in6addr_any,
1410
541
self.server_address[1])
1411
elif not self.server_address[1]:
542
elif self.server_address[1] is None:
1412
543
self.server_address = (self.server_address[0],
1413
544
0)
1414
# if self.interface:
1415
# self.server_address = (self.server_address[0],
1416
# 0, # port
1417
# 0, # flowinfo
1418
# if_nametoindex
1419
# (self.interface))
1420
return socketserver.TCPServer.server_bind(self)
1421
1422
1423
class MandosServer(IPv6_TCPServer):
1424
"""Mandos server.
1425
1426
Attributes:
1427
clients: set of Client objects
1428
gnutls_priority GnuTLS priority string
1429
use_dbus: Boolean; to emit D-Bus signals or not
1430
1431
Assumes a gobject.MainLoop event loop.
1432
"""
1433
def __init__(self, server_address, RequestHandlerClass,
1434
interface=None, use_ipv6=True, clients=None,
1435
gnutls_priority=None, use_dbus=True):
1436
self.enabled = False
1437
self.clients = clients
1438
if self.clients is None:
1439
self.clients = set()
1440
self.use_dbus = use_dbus
1441
self.gnutls_priority = gnutls_priority
1442
IPv6_TCPServer.__init__(self, server_address,
1443
RequestHandlerClass,
1444
interface = interface,
1445
use_ipv6 = use_ipv6)
1446
def server_activate(self):
1447
if self.enabled:
1448
return socketserver.TCPServer.server_activate(self)
1449
def enable(self):
1450
self.enabled = True
1451
def add_pipe(self, parent_pipe):
1452
# Call "handle_ipc" for both data and EOF events
1453
gobject.io_add_watch(parent_pipe.fileno(),
1454
gobject.IO_IN | gobject.IO_HUP,
1455
functools.partial(self.handle_ipc,
1456
parent_pipe = parent_pipe))
1457
1458
def handle_ipc(self, source, condition, parent_pipe=None,
1459
client_object=None):
1460
condition_names = {
1461
gobject.IO_IN: u"IN", # There is data to read.
1462
gobject.IO_OUT: u"OUT", # Data can be written (without
1463
# blocking).
1464
gobject.IO_PRI: u"PRI", # There is urgent data to read.
1465
gobject.IO_ERR: u"ERR", # Error condition.
1466
gobject.IO_HUP: u"HUP" # Hung up (the connection has been
1467
# broken, usually for pipes and
1468
# sockets).
1469
}
1470
conditions_string = ' | '.join(name
1471
for cond, name in
1472
condition_names.iteritems()
1473
if cond & condition)
1474
# error or the other end of multiprocessing.Pipe has closed
1475
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1476
return False
1477
1478
# Read a request from the child
1479
request = parent_pipe.recv()
1480
command = request[0]
1481
1482
if command == 'init':
1483
fpr = request[1]
1484
address = request[2]
1485
1486
for c in self.clients:
1487
if c.fingerprint == fpr:
1488
client = c
1489
break
1490
else:
1491
logger.warning(u"Client not found for fingerprint: %s, ad"
1492
u"dress: %s", fpr, address)
1493
if self.use_dbus:
1494
# Emit D-Bus signal
1495
mandos_dbus_service.ClientNotFound(fpr, address)
1496
parent_pipe.send(False)
1497
return False
1498
1499
gobject.io_add_watch(parent_pipe.fileno(),
1500
gobject.IO_IN | gobject.IO_HUP,
1501
functools.partial(self.handle_ipc,
1502
parent_pipe = parent_pipe,
1503
client_object = client))
1504
parent_pipe.send(True)
1505
# remove the old hook in favor of the new above hook on same fileno
1506
return False
1507
if command == 'funcall':
1508
funcname = request[1]
1509
args = request[2]
1510
kwargs = request[3]
1511
1512
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1513
1514
if command == 'getattr':
1515
attrname = request[1]
1516
if callable(client_object.__getattribute__(attrname)):
1517
parent_pipe.send(('function',))
1518
else:
1519
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1520
1521
if command == 'setattr':
1522
attrname = request[1]
1523
value = request[2]
1524
setattr(client_object, attrname, value)
1525
1526
return True
545
return super(type(self), self).server_bind()
1527
546
1528
547
1529
548
def string_to_delta(interval):
1530
549
"""Parse a string and return a datetime.timedelta
1531
1532
>>> string_to_delta(u'7d')
550
551
>>> string_to_delta('7d')
1533
552
datetime.timedelta(7)
1534
>>> string_to_delta(u'60s')
553
>>> string_to_delta('60s')
1535
554
datetime.timedelta(0, 60)
1536
>>> string_to_delta(u'60m')
555
>>> string_to_delta('60m')
1537
556
datetime.timedelta(0, 3600)
1538
>>> string_to_delta(u'24h')
557
>>> string_to_delta('24h')
1539
558
datetime.timedelta(1)
1540
559
>>> string_to_delta(u'1w')
1541
560
datetime.timedelta(7)
1542
>>> string_to_delta(u'5m 30s')
1543
datetime.timedelta(0, 330)
1544
561
"""
1545
timevalue = datetime.timedelta(0)
1546
for s in interval.split():
1547
try:
1548
suffix = unicode(s[-1])
1549
value = int(s[:-1])
1550
if suffix == u"d":
1551
delta = datetime.timedelta(value)
1552
elif suffix == u"s":
1553
delta = datetime.timedelta(0, value)
1554
elif suffix == u"m":
1555
delta = datetime.timedelta(0, 0, 0, 0, value)
1556
elif suffix == u"h":
1557
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1558
elif suffix == u"w":
1559
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1560
else:
1561
raise ValueError(u"Unknown suffix %r" % suffix)
1562
except (ValueError, IndexError), e:
1563
raise ValueError(e.message)
1564
timevalue += delta
1565
return timevalue
1566
562
try:
563
suffix=unicode(interval[-1])
564
value=int(interval[:-1])
565
if suffix == u"d":
566
delta = datetime.timedelta(value)
567
elif suffix == u"s":
568
delta = datetime.timedelta(0, value)
569
elif suffix == u"m":
570
delta = datetime.timedelta(0, 0, 0, 0, value)
571
elif suffix == u"h":
572
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
573
elif suffix == u"w":
574
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
575
else:
576
raise ValueError
577
except (ValueError, IndexError):
578
raise ValueError
579
return delta
580
581
582
def server_state_changed(state):
583
"""Derived from the Avahi example code"""
584
if state == avahi.SERVER_COLLISION:
585
logger.warning(u"Server name collision")
586
service.remove()
587
elif state == avahi.SERVER_RUNNING:
588
service.add()
589
590
591
def entry_group_state_changed(state, error):
592
"""Derived from the Avahi example code"""
593
logger.debug(u"state change: %i", state)
594
595
if state == avahi.ENTRY_GROUP_ESTABLISHED:
596
logger.debug(u"Service established.")
597
elif state == avahi.ENTRY_GROUP_COLLISION:
598
logger.warning(u"Service name collision.")
599
service.rename()
600
elif state == avahi.ENTRY_GROUP_FAILURE:
601
logger.critical(u"Error in group state changed %s",
602
unicode(error))
603
raise AvahiGroupError("State changed: %s", str(error))
1567
604
1568
605
def if_nametoindex(interface):
1569
"""Call the C function if_nametoindex(), or equivalent
1570
1571
Note: This function cannot accept a unicode string."""
606
"""Call the C function if_nametoindex(), or equivalent"""
1572
607
global if_nametoindex
1573
608
try:
1574
if_nametoindex = (ctypes.cdll.LoadLibrary
1575
(ctypes.util.find_library(u"c"))
1576
.if_nametoindex)
609
if "ctypes.util" not in sys.modules:
610
import ctypes.util
611
if_nametoindex = ctypes.cdll.LoadLibrary\
612
(ctypes.util.find_library("c")).if_nametoindex
1577
613
except (OSError, AttributeError):
1578
logger.warning(u"Doing if_nametoindex the hard way")
614
if "struct" not in sys.modules:
615
import struct
616
if "fcntl" not in sys.modules:
617
import fcntl
1579
618
def if_nametoindex(interface):
1580
619
"Get an interface index the hard way, i.e. using fcntl()"
1581
620
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1582
with contextlib.closing(socket.socket()) as s:
1583
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1584
struct.pack(str(u"16s16x"),
1585
interface))
1586
interface_index = struct.unpack(str(u"I"),
1587
ifreq[16:20])[0]
621
s = socket.socket()
622
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
623
struct.pack("16s16x", interface))
624
s.close()
625
interface_index = struct.unpack("I", ifreq[16:20])[0]
1588
626
return interface_index
1589
627
return if_nametoindex(interface)
1590
628
1591
629
1592
def daemon(nochdir = False, noclose = False):
630
def daemon(nochdir, noclose):
1593
631
"""See daemon(3). Standard BSD Unix function.
1594
1595
632
This should really exist as os.daemon, but it doesn't (yet)."""
1596
633
if os.fork():
1597
634
sys.exit()
1598
635
os.setsid()
1599
636
if not nochdir:
1600
os.chdir(u"/")
1601
if os.fork():
1602
sys.exit()
637
os.chdir("/")
1603
638
if not noclose:
1604
639
# Close all standard open file descriptors
1605
640
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1606
641
if not stat.S_ISCHR(os.fstat(null).st_mode):
1607
642
raise OSError(errno.ENODEV,
1608
u"%s not a character device"
1609
% os.path.devnull)
643
"/dev/null not a character device")
1610
644
os.dup2(null, sys.stdin.fileno())
1611
645
os.dup2(null, sys.stdout.fileno())
1612
646
os.dup2(null, sys.stderr.fileno())
1615
649
1616
650
1617
651
def main():
1618
1619
##################################################################
1620
# Parsing of options, both command line and config file
1621
1622
parser = optparse.OptionParser(version = "%%prog %s" % version)
1623
parser.add_option("-i", u"--interface", type=u"string",
1624
metavar="IF", help=u"Bind to interface IF")
1625
parser.add_option("-a", u"--address", type=u"string",
1626
help=u"Address to listen for requests on")
1627
parser.add_option("-p", u"--port", type=u"int",
1628
help=u"Port number to receive requests on")
1629
parser.add_option("--check", action=u"store_true",
1630
help=u"Run self-test")
1631
parser.add_option("--debug", action=u"store_true",
1632
help=u"Debug mode; run in foreground and log to"
1633
u" terminal")
1634
parser.add_option("--debuglevel", type=u"string", metavar="Level",
1635
help=u"Debug level for stdout output")
1636
parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1637
u" priority string (see GnuTLS documentation)")
1638
parser.add_option("--servicename", type=u"string",
1639
metavar=u"NAME", help=u"Zeroconf service name")
1640
parser.add_option("--configdir", type=u"string",
1641
default=u"/etc/mandos", metavar=u"DIR",
1642
help=u"Directory to search for configuration"
1643
u" files")
1644
parser.add_option("--no-dbus", action=u"store_false",
1645
dest=u"use_dbus", help=u"Do not provide D-Bus"
1646
u" system bus interface")
1647
parser.add_option("--no-ipv6", action=u"store_false",
1648
dest=u"use_ipv6", help=u"Do not use IPv6")
1649
options = parser.parse_args()[0]
652
global main_loop_started
653
main_loop_started = False
654
655
parser = OptionParser()
656
parser.add_option("-i", "--interface", type="string",
657
metavar="IF", help="Bind to interface IF")
658
parser.add_option("-a", "--address", type="string",
659
help="Address to listen for requests on")
660
parser.add_option("-p", "--port", type="int",
661
help="Port number to receive requests on")
662
parser.add_option("--check", action="store_true", default=False,
663
help="Run self-test")
664
parser.add_option("--debug", action="store_true", default=False,
665
help="Debug mode; run in foreground and log to"
666
" terminal")
667
parser.add_option("--priority", type="string", help="GnuTLS"
668
" priority string (see GnuTLS documentation)")
669
parser.add_option("--servicename", type="string", metavar="NAME",
670
help="Zeroconf service name")
671
parser.add_option("--configdir", type="string",
672
default="/etc/mandos", metavar="DIR",
673
help="Directory to search for configuration"
674
" files")
675
(options, args) = parser.parse_args()
1650
676
1651
677
if options.check:
1652
678
import doctest
1654
680
sys.exit()
1655
681
1656
682
# Default values for config file for server-global settings
1657
server_defaults = { u"interface": u"",
1658
u"address": u"",
1659
u"port": u"",
1660
u"debug": u"False",
1661
u"priority":
1662
u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1663
u"servicename": u"Mandos",
1664
u"use_dbus": u"True",
1665
u"use_ipv6": u"True",
1666
u"debuglevel": u"",
683
server_defaults = { "interface": "",
684
"address": "",
685
"port": "",
686
"debug": "False",
687
"priority":
688
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
689
"servicename": "Mandos",
1667
690
}
1668
691
1669
692
# Parse config file for server-global settings
1670
server_config = configparser.SafeConfigParser(server_defaults)
693
server_config = ConfigParser.SafeConfigParser(server_defaults)
1671
694
del server_defaults
1672
server_config.read(os.path.join(options.configdir,
1673
u"mandos.conf"))
695
server_config.read(os.path.join(options.configdir, "server.conf"))
696
server_section = "server"
1674
697
# Convert the SafeConfigParser object to a dict
1675
server_settings = server_config.defaults()
1676
# Use the appropriate methods on the non-string config options
1677
for option in (u"debug", u"use_dbus", u"use_ipv6"):
1678
server_settings[option] = server_config.getboolean(u"DEFAULT",
1679
option)
1680
if server_settings["port"]:
1681
server_settings["port"] = server_config.getint(u"DEFAULT",
1682
u"port")
698
server_settings = dict(server_config.items(server_section))
699
# Use getboolean on the boolean config option
700
server_settings["debug"] = server_config.getboolean\
701
(server_section, "debug")
1683
702
del server_config
1684
703
1685
704
# Override the settings from the config file with command line
1686
705
# options, if set.
1687
for option in (u"interface", u"address", u"port", u"debug",
1688
u"priority", u"servicename", u"configdir",
1689
u"use_dbus", u"use_ipv6", u"debuglevel"):
706
for option in ("interface", "address", "port", "debug",
707
"priority", "servicename", "configdir"):
1690
708
value = getattr(options, option)
1691
709
if value is not None:
1692
710
server_settings[option] = value
1693
711
del options
1694
# Force all strings to be unicode
1695
for option in server_settings.keys():
1696
if type(server_settings[option]) is str:
1697
server_settings[option] = unicode(server_settings[option])
1698
712
# Now we have our good server settings in "server_settings"
1699
713
1700
##################################################################
1701
1702
# For convenience
1703
debug = server_settings[u"debug"]
1704
debuglevel = server_settings[u"debuglevel"]
1705
use_dbus = server_settings[u"use_dbus"]
1706
use_ipv6 = server_settings[u"use_ipv6"]
1707
1708
if server_settings[u"servicename"] != u"Mandos":
1709
syslogger.setFormatter(logging.Formatter
1710
(u'Mandos (%s) [%%(process)d]:'
1711
u' %%(levelname)s: %%(message)s'
1712
% server_settings[u"servicename"]))
1713
1714
714
# Parse config file with clients
1715
client_defaults = { u"timeout": u"1h",
1716
u"interval": u"5m",
1717
u"checker": u"fping -q -- %%(host)s",
1718
u"host": u"",
1719
u"approved_delay": u"0s",
1720
u"approved_duration": u"1s",
715
client_defaults = { "timeout": "1h",
716
"interval": "5m",
717
"checker": "fping -q -- %%(fqdn)s",
1721
718
}
1722
client_config = configparser.SafeConfigParser(client_defaults)
1723
client_config.read(os.path.join(server_settings[u"configdir"],
1724
u"clients.conf"))
1725
1726
global mandos_dbus_service
1727
mandos_dbus_service = None
1728
1729
tcp_server = MandosServer((server_settings[u"address"],
1730
server_settings[u"port"]),
1731
ClientHandler,
1732
interface=(server_settings[u"interface"]
1733
or None),
1734
use_ipv6=use_ipv6,
1735
gnutls_priority=
1736
server_settings[u"priority"],
1737
use_dbus=use_dbus)
1738
pidfilename = u"/var/run/mandos.pid"
1739
try:
1740
pidfile = open(pidfilename, u"w")
1741
except IOError:
1742
logger.error(u"Could not open file %r", pidfilename)
1743
1744
try:
1745
uid = pwd.getpwnam(u"_mandos").pw_uid
1746
gid = pwd.getpwnam(u"_mandos").pw_gid
1747
except KeyError:
1748
try:
1749
uid = pwd.getpwnam(u"mandos").pw_uid
1750
gid = pwd.getpwnam(u"mandos").pw_gid
1751
except KeyError:
1752
try:
1753
uid = pwd.getpwnam(u"nobody").pw_uid
1754
gid = pwd.getpwnam(u"nobody").pw_gid
1755
except KeyError:
1756
uid = 65534
1757
gid = 65534
1758
try:
1759
os.setgid(gid)
1760
os.setuid(uid)
1761
except OSError, error:
1762
if error[0] != errno.EPERM:
1763
raise error
1764
1765
# Enable all possible GnuTLS debugging
1766
1767
1768
if not debug and not debuglevel:
1769
syslogger.setLevel(logging.WARNING)
1770
console.setLevel(logging.WARNING)
1771
if debuglevel:
1772
level = getattr(logging, debuglevel.upper())
1773
syslogger.setLevel(level)
1774
console.setLevel(level)
1775
1776
if debug:
1777
# "Use a log level over 10 to enable all debugging options."
1778
# - GnuTLS manual
1779
gnutls.library.functions.gnutls_global_set_log_level(11)
1780
1781
@gnutls.library.types.gnutls_log_func
1782
def debug_gnutls(level, string):
1783
logger.debug(u"GnuTLS: %s", string[:-1])
1784
1785
(gnutls.library.functions
1786
.gnutls_global_set_log_function(debug_gnutls))
1787
1788
# Redirect stdin so all checkers get /dev/null
1789
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1790
os.dup2(null, sys.stdin.fileno())
1791
if null > 2:
1792
os.close(null)
1793
else:
1794
# No console logging
1795
logger.removeHandler(console)
1796
719
client_config = ConfigParser.SafeConfigParser(client_defaults)
720
client_config.read(os.path.join(server_settings["configdir"],
721
"clients.conf"))
722
723
global service
724
service = AvahiService(name = server_settings["servicename"],
725
type = "_mandos._tcp", );
726
if server_settings["interface"]:
727
service.interface = if_nametoindex(server_settings["interface"])
1797
728
1798
729
global main_loop
730
global bus
731
global server
1799
732
# From the Avahi example code
1800
733
DBusGMainLoop(set_as_default=True )
1801
734
main_loop = gobject.MainLoop()
1802
735
bus = dbus.SystemBus()
736
server = dbus.Interface(
737
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
738
avahi.DBUS_INTERFACE_SERVER )
1803
739
# End of Avahi example code
1804
if use_dbus:
1805
try:
1806
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
1807
bus, do_not_queue=True)
1808
except dbus.exceptions.NameExistsException, e:
1809
logger.error(unicode(e) + u", disabling D-Bus")
1810
use_dbus = False
1811
server_settings[u"use_dbus"] = False
1812
tcp_server.use_dbus = False
1813
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1814
service = AvahiService(name = server_settings[u"servicename"],
1815
servicetype = u"_mandos._tcp",
1816
protocol = protocol, bus = bus)
1817
if server_settings["interface"]:
1818
service.interface = (if_nametoindex
1819
(str(server_settings[u"interface"])))
1820
740
741
debug = server_settings["debug"]
742
743
if debug:
744
console = logging.StreamHandler()
745
# console.setLevel(logging.DEBUG)
746
console.setFormatter(logging.Formatter\
747
('%(levelname)s: %(message)s'))
748
logger.addHandler(console)
749
del console
750
751
clients = Set()
752
def remove_from_clients(client):
753
clients.remove(client)
754
if not clients:
755
logger.debug(u"No clients left, exiting")
756
sys.exit()
757
758
clients.update(Set(Client(name=section,
759
stop_hook = remove_from_clients,
760
**(dict(client_config\
761
.items(section))))
762
for section in client_config.sections()))
763
1821
764
if not debug:
1822
# Close all input and output, do double fork, etc.
1823
daemon()
1824
1825
global multiprocessing_manager
1826
multiprocessing_manager = multiprocessing.Manager()
1827
1828
client_class = Client
1829
if use_dbus:
1830
client_class = functools.partial(ClientDBus, bus = bus)
1831
def client_config_items(config, section):
1832
special_settings = {
1833
"approved_by_default":
1834
lambda: config.getboolean(section,
1835
"approved_by_default"),
1836
}
1837
for name, value in config.items(section):
1838
try:
1839
yield (name, special_settings[name]())
1840
except KeyError:
1841
yield (name, value)
1842
1843
tcp_server.clients.update(set(
1844
client_class(name = section,
1845
config= dict(client_config_items(
1846
client_config, section)))
1847
for section in client_config.sections()))
1848
if not tcp_server.clients:
1849
logger.warning(u"No clients defined")
1850
1851
try:
1852
with pidfile:
1853
pid = os.getpid()
1854
pidfile.write(str(pid) + "\n")
1855
del pidfile
1856
except IOError:
1857
logger.error(u"Could not write to file %r with PID %d",
1858
pidfilename, pid)
1859
except NameError:
1860
# "pidfile" was never created
1861
pass
1862
del pidfilename
765
daemon(False, False)
766
767
def cleanup():
768
"Cleanup function; run on exit"
769
global group
770
# From the Avahi example code
771
if not group is None:
772
group.Free()
773
group = None
774
# End of Avahi example code
775
776
while clients:
777
client = clients.pop()
778
client.stop_hook = None
779
client.stop()
780
781
atexit.register(cleanup)
1863
782
1864
783
if not debug:
1865
784
signal.signal(signal.SIGINT, signal.SIG_IGN)
1866
785
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1867
786
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1868
787
1869
if use_dbus:
1870
class MandosDBusService(dbus.service.Object):
1871
"""A D-Bus proxy object"""
1872
def __init__(self):
1873
dbus.service.Object.__init__(self, bus, u"/")
1874
_interface = u"se.bsnet.fukt.Mandos"
1875
1876
@dbus.service.signal(_interface, signature=u"o")
1877
def ClientAdded(self, objpath):
1878
"D-Bus signal"
1879
pass
1880
1881
@dbus.service.signal(_interface, signature=u"ss")
1882
def ClientNotFound(self, fingerprint, address):
1883
"D-Bus signal"
1884
pass
1885
1886
@dbus.service.signal(_interface, signature=u"os")
1887
def ClientRemoved(self, objpath, name):
1888
"D-Bus signal"
1889
pass
1890
1891
@dbus.service.method(_interface, out_signature=u"ao")
1892
def GetAllClients(self):
1893
"D-Bus method"
1894
return dbus.Array(c.dbus_object_path
1895
for c in tcp_server.clients)
1896
1897
@dbus.service.method(_interface,
1898
out_signature=u"a{oa{sv}}")
1899
def GetAllClientsWithProperties(self):
1900
"D-Bus method"
1901
return dbus.Dictionary(
1902
((c.dbus_object_path, c.GetAll(u""))
1903
for c in tcp_server.clients),
1904
signature=u"oa{sv}")
1905
1906
@dbus.service.method(_interface, in_signature=u"o")
1907
def RemoveClient(self, object_path):
1908
"D-Bus method"
1909
for c in tcp_server.clients:
1910
if c.dbus_object_path == object_path:
1911
tcp_server.clients.remove(c)
1912
c.remove_from_connection()
1913
# Don't signal anything except ClientRemoved
1914
c.disable(quiet=True)
1915
# Emit D-Bus signal
1916
self.ClientRemoved(object_path, c.name)
1917
return
1918
raise KeyError(object_path)
1919
1920
del _interface
1921
1922
mandos_dbus_service = MandosDBusService()
1923
1924
def cleanup():
1925
"Cleanup function; run on exit"
1926
service.cleanup()
1927
1928
while tcp_server.clients:
1929
client = tcp_server.clients.pop()
1930
if use_dbus:
1931
client.remove_from_connection()
1932
client.disable_hook = None
1933
# Don't signal anything except ClientRemoved
1934
client.disable(quiet=True)
1935
if use_dbus:
1936
# Emit D-Bus signal
1937
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1938
client.name)
1939
1940
atexit.register(cleanup)
1941
1942
for client in tcp_server.clients:
1943
if use_dbus:
1944
# Emit D-Bus signal
1945
mandos_dbus_service.ClientAdded(client.dbus_object_path)
1946
client.enable()
1947
1948
tcp_server.enable()
1949
tcp_server.server_activate()
1950
788
for client in clients:
789
client.start()
790
791
tcp_server = IPv6_TCPServer((server_settings["address"],
792
server_settings["port"]),
793
tcp_handler,
794
settings=server_settings,
795
clients=clients)
1951
796
# Find out what port we got
1952
797
service.port = tcp_server.socket.getsockname()[1]
1953
if use_ipv6:
1954
logger.info(u"Now listening on address %r, port %d,"
1955
" flowinfo %d, scope_id %d"
1956
% tcp_server.socket.getsockname())
1957
else: # IPv4
1958
logger.info(u"Now listening on address %r, port %d"
1959
% tcp_server.socket.getsockname())
798
logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
799
u" scope_id %d" % tcp_server.socket.getsockname())
1960
800
1961
801
#service.interface = tcp_server.socket.getsockname()[3]
1962
802
1963
803
try:
1964
804
# From the Avahi example code
805
server.connect_to_signal("StateChanged", server_state_changed)
1965
806
try:
1966
service.activate()
807
server_state_changed(server.GetState())
1967
808
except dbus.exceptions.DBusException, error:
1968
809
logger.critical(u"DBusException: %s", error)
1969
cleanup()
1970
810
sys.exit(1)
1971
811
# End of Avahi example code
1972
812
1973
813
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1974
814
lambda *args, **kwargs:
1975
(tcp_server.handle_request
1976
(*args[2:], **kwargs) or True))
815
tcp_server.handle_request\
816
(*args[2:], **kwargs) or True)
1977
817
1978
logger.debug(u"Starting main loop")
818
logger.debug("Starting main loop")
819
main_loop_started = True
1979
820
main_loop.run()
1980
821
except AvahiError, error:
1981
logger.critical(u"AvahiError: %s", error)
1982
cleanup()
822
logger.critical(u"AvahiError: %s" + unicode(error))
1983
823
sys.exit(1)
1984
824
except KeyboardInterrupt:
1985
825
if debug:
1986
print >> sys.stderr
1987
logger.debug(u"Server received KeyboardInterrupt")
1988
logger.debug(u"Server exiting")
1989
# Must run before the D-Bus bus name gets deregistered
1990
cleanup()
826
print
1991
827
1992
828
if __name__ == '__main__':
1993
829
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0