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- Committer: Björn Påhlsson
- Date: 2008-08-11 16:35:32 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 66.
- Revision ID: belorn@braxen-20080811163532-er1zd4q2j4ykfv11
Fixed fallback on error in mandos-client
fixed a bug in password-request
fixed a bug in password-request
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
mandos
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add", "remove", "server_state_changed",
10
# "entry_group_state_changed", "cleanup", and "activate" in the
11
# "AvahiService" class, and some lines in "main".
9
# methods "add" and "remove" in the "AvahiService" class, the
10
# "server_state_changed" and "entry_group_state_changed" functions,
11
# and some lines in "main".
12
12
#
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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/>.
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28
#
31
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# 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
version = "1.0"
65
66
logger = logging.Logger('mandos')
67
syslogger = logging.handlers.SysLogHandler\
68
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
address = "/dev/log")
70
syslogger.setFormatter(logging.Formatter\
71
('Mandos: %(levelname)s: %(message)s'))
94
72
logger.addHandler(syslogger)
95
73
96
74
console = logging.StreamHandler()
97
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
98
u' %(levelname)s:'
99
u' %(message)s'))
75
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
' %(message)s'))
100
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logger.addHandler(console)
101
78
102
79
class AvahiError(Exception):
103
def __init__(self, value, *args, **kwargs):
80
def __init__(self, value):
104
81
self.value = value
105
super(AvahiError, self).__init__(value, *args, **kwargs)
106
def __unicode__(self):
107
return unicode(repr(self.value))
82
def __str__(self):
83
return repr(self.value)
108
84
109
85
class AvahiServiceError(AvahiError):
110
86
pass
115
91
116
92
class AvahiService(object):
117
93
"""An Avahi (Zeroconf) service.
118
119
94
Attributes:
120
95
interface: integer; avahi.IF_UNSPEC or an interface index.
121
96
Used to optionally bind to the specified interface.
122
name: string; Example: u'Mandos'
123
type: string; Example: u'_mandos._tcp'.
97
name: string; Example: 'Mandos'
98
type: string; Example: '_mandos._tcp'.
124
99
See <http://www.dns-sd.org/ServiceTypes.html>
125
100
port: integer; what port to announce
126
101
TXT: list of strings; TXT record for the service
129
104
max_renames: integer; maximum number of renames
130
105
rename_count: integer; counter so we only rename after collisions
131
106
a sensible number of times
132
group: D-Bus Entry Group
133
server: D-Bus Server
134
bus: dbus.SystemBus()
135
107
"""
136
108
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):
109
type = None, port = None, TXT = None, domain = "",
110
host = "", max_renames = 32768):
140
111
self.interface = interface
141
112
self.name = name
142
self.type = servicetype
113
self.type = type
143
114
self.port = port
144
self.TXT = TXT if TXT is not None else []
115
if TXT is None:
116
self.TXT = []
117
else:
118
self.TXT = TXT
145
119
self.domain = domain
146
120
self.host = host
147
121
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
122
def rename(self):
154
123
"""Derived from the Avahi example code"""
155
124
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))
125
logger.critical(u"No suitable service name found after %i"
126
u" retries, exiting.", rename_count)
127
raise AvahiServiceError("Too many renames")
128
name = server.GetAlternativeServiceName(name)
129
logger.error(u"Changing name to %r ...", name)
130
syslogger.setFormatter(logging.Formatter\
131
('Mandos (%s): %%(levelname)s:'
132
' %%(message)s' % name))
167
133
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)
134
self.add()
174
135
self.rename_count += 1
175
136
def remove(self):
176
137
"""Derived from the Avahi example code"""
177
if self.group is not None:
178
self.group.Reset()
138
if group is not None:
139
group.Reset()
179
140
def add(self):
180
141
"""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())
142
global group
143
if group is None:
144
group = dbus.Interface\
145
(bus.get_object(avahi.DBUS_NAME,
146
server.EntryGroupNew()),
147
avahi.DBUS_INTERFACE_ENTRY_GROUP)
148
group.connect_to_signal('StateChanged',
149
entry_group_state_changed)
150
logger.debug(u"Adding service '%s' of type '%s' ...",
151
service.name, service.type)
152
group.AddService(
153
self.interface, # interface
154
avahi.PROTO_INET6, # protocol
155
dbus.UInt32(0), # flags
156
self.name, self.type,
157
self.domain, self.host,
158
dbus.UInt16(self.port),
159
avahi.string_array_to_txt_array(self.TXT))
160
group.Commit()
161
162
# From the Avahi example code:
163
group = None # our entry group
164
# End of Avahi example code
237
165
238
166
239
167
class Client(object):
240
168
"""A representation of a client host served by this server.
241
242
169
Attributes:
243
_approved: bool(); 'None' if not yet approved/disapproved
244
approval_delay: datetime.timedelta(); Time to wait for approval
245
approval_duration: datetime.timedelta(); Duration of one approval
246
checker: subprocess.Popen(); a running checker process used
247
to see if the client lives.
248
'None' if no process is running.
170
name: string; from the config file, used in log messages
171
fingerprint: string (40 or 32 hexadecimal digits); used to
172
uniquely identify the client
173
secret: bytestring; sent verbatim (over TLS) to client
174
host: string; available for use by the checker command
175
created: datetime.datetime(); object creation, not client host
176
last_checked_ok: datetime.datetime() or None if not yet checked OK
177
timeout: datetime.timedelta(); How long from last_checked_ok
178
until this client is invalid
179
interval: datetime.timedelta(); How often to start a new checker
180
stop_hook: If set, called by stop() as stop_hook(self)
181
checker: subprocess.Popen(); a running checker process used
182
to see if the client lives.
183
'None' if no process is running.
184
checker_initiator_tag: a gobject event source tag, or None
185
stop_initiator_tag: - '' -
249
186
checker_callback_tag: - '' -
250
checker_command: string; External command which is run to check
251
if client lives. %() expansions are done at
187
checker_command: string; External command which is run to check if
188
client lives. %() expansions are done at
252
189
runtime with vars(self) as dict, so that for
253
190
instance %(name)s can be used in the command.
254
checker_initiator_tag: a gobject event source tag, or None
255
created: datetime.datetime(); (UTC) object creation
256
current_checker_command: string; current running checker_command
257
disable_hook: If set, called by disable() as disable_hook(self)
258
disable_initiator_tag: - '' -
259
enabled: bool()
260
fingerprint: string (40 or 32 hexadecimal digits); used to
261
uniquely identify the client
262
host: string; available for use by the checker command
263
interval: datetime.timedelta(); How often to start a new checker
264
last_checked_ok: datetime.datetime(); (UTC) or None
265
last_enabled: datetime.datetime(); (UTC)
266
name: string; from the config file, used in log messages and
267
D-Bus identifiers
268
secret: bytestring; sent verbatim (over TLS) to client
269
timeout: datetime.timedelta(); How long from last_checked_ok
270
until this client is disabled
271
runtime_expansions: Allowed attributes for runtime expansion.
191
Private attibutes:
192
_timeout: Real variable for 'timeout'
193
_interval: Real variable for 'interval'
194
_timeout_milliseconds: Used when calling gobject.timeout_add()
195
_interval_milliseconds: - '' -
272
196
"""
273
274
runtime_expansions = (u"approval_delay", u"approval_duration",
275
u"created", u"enabled", u"fingerprint",
276
u"host", u"interval", u"last_checked_ok",
277
u"last_enabled", u"name", u"timeout")
278
279
@staticmethod
280
def _timedelta_to_milliseconds(td):
281
"Convert a datetime.timedelta() to milliseconds"
282
return ((td.days * 24 * 60 * 60 * 1000)
283
+ (td.seconds * 1000)
284
+ (td.microseconds // 1000))
285
286
def timeout_milliseconds(self):
287
"Return the 'timeout' attribute in milliseconds"
288
return self._timedelta_to_milliseconds(self.timeout)
289
290
def interval_milliseconds(self):
291
"Return the 'interval' attribute in milliseconds"
292
return self._timedelta_to_milliseconds(self.interval)
293
294
def approval_delay_milliseconds(self):
295
return self._timedelta_to_milliseconds(self.approval_delay)
296
297
def __init__(self, name = None, disable_hook=None, config=None):
197
def _set_timeout(self, timeout):
198
"Setter function for 'timeout' attribute"
199
self._timeout = timeout
200
self._timeout_milliseconds = ((self.timeout.days
201
* 24 * 60 * 60 * 1000)
202
+ (self.timeout.seconds * 1000)
203
+ (self.timeout.microseconds
204
// 1000))
205
timeout = property(lambda self: self._timeout,
206
_set_timeout)
207
del _set_timeout
208
def _set_interval(self, interval):
209
"Setter function for 'interval' attribute"
210
self._interval = interval
211
self._interval_milliseconds = ((self.interval.days
212
* 24 * 60 * 60 * 1000)
213
+ (self.interval.seconds
214
* 1000)
215
+ (self.interval.microseconds
216
// 1000))
217
interval = property(lambda self: self._interval,
218
_set_interval)
219
del _set_interval
220
def __init__(self, name = None, stop_hook=None, config={}):
298
221
"""Note: the 'checker' key in 'config' sets the
299
222
'checker_command' attribute and *not* the 'checker'
300
223
attribute."""
301
224
self.name = name
302
if config is None:
303
config = {}
304
225
logger.debug(u"Creating client %r", self.name)
305
226
# Uppercase and remove spaces from fingerprint for later
306
227
# comparison purposes with return value from the fingerprint()
307
228
# function
308
self.fingerprint = (config[u"fingerprint"].upper()
309
.replace(u" ", u""))
229
self.fingerprint = config["fingerprint"].upper()\
230
.replace(u" ", u"")
310
231
logger.debug(u" Fingerprint: %s", self.fingerprint)
311
if u"secret" in config:
312
self.secret = config[u"secret"].decode(u"base64")
313
elif u"secfile" in config:
314
with open(os.path.expanduser(os.path.expandvars
315
(config[u"secfile"])),
316
"rb") as secfile:
317
self.secret = secfile.read()
232
if "secret" in config:
233
self.secret = config["secret"].decode(u"base64")
234
elif "secfile" in config:
235
sf = open(config["secfile"])
236
self.secret = sf.read()
237
sf.close()
318
238
else:
319
239
raise TypeError(u"No secret or secfile for client %s"
320
240
% self.name)
321
self.host = config.get(u"host", u"")
322
self.created = datetime.datetime.utcnow()
323
self.enabled = False
324
self.last_enabled = None
241
self.host = config.get("host", "")
242
self.created = datetime.datetime.now()
325
243
self.last_checked_ok = None
326
self.timeout = string_to_delta(config[u"timeout"])
327
self.interval = string_to_delta(config[u"interval"])
328
self.disable_hook = disable_hook
244
self.timeout = string_to_delta(config["timeout"])
245
self.interval = string_to_delta(config["interval"])
246
self.stop_hook = stop_hook
329
247
self.checker = None
330
248
self.checker_initiator_tag = None
331
self.disable_initiator_tag = None
249
self.stop_initiator_tag = None
332
250
self.checker_callback_tag = None
333
self.checker_command = config[u"checker"]
334
self.current_checker_command = None
335
self.last_connect = None
336
self._approved = None
337
self.approved_by_default = config.get(u"approved_by_default",
338
True)
339
self.approvals_pending = 0
340
self.approval_delay = string_to_delta(
341
config[u"approval_delay"])
342
self.approval_duration = string_to_delta(
343
config[u"approval_duration"])
344
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
345
346
def send_changedstate(self):
347
self.changedstate.acquire()
348
self.changedstate.notify_all()
349
self.changedstate.release()
350
351
def enable(self):
251
self.check_command = config["checker"]
252
def start(self):
352
253
"""Start this client's checker and timeout hooks"""
353
if getattr(self, u"enabled", False):
354
# Already enabled
355
return
356
self.send_changedstate()
357
self.last_enabled = datetime.datetime.utcnow()
358
254
# Schedule a new checker to be started an 'interval' from now,
359
255
# and every interval from then on.
360
self.checker_initiator_tag = (gobject.timeout_add
361
(self.interval_milliseconds(),
362
self.start_checker))
363
# Schedule a disable() when 'timeout' has passed
364
self.disable_initiator_tag = (gobject.timeout_add
365
(self.timeout_milliseconds(),
366
self.disable))
367
self.enabled = True
256
self.checker_initiator_tag = gobject.timeout_add\
257
(self._interval_milliseconds,
258
self.start_checker)
368
259
# Also start a new checker *right now*.
369
260
self.start_checker()
370
371
def disable(self, quiet=True):
372
"""Disable this client."""
373
if not getattr(self, "enabled", False):
261
# Schedule a stop() when 'timeout' has passed
262
self.stop_initiator_tag = gobject.timeout_add\
263
(self._timeout_milliseconds,
264
self.stop)
265
def stop(self):
266
"""Stop this client.
267
The possibility that a client might be restarted is left open,
268
but not currently used."""
269
# If this client doesn't have a secret, it is already stopped.
270
if hasattr(self, "secret") and self.secret:
271
logger.info(u"Stopping client %s", self.name)
272
self.secret = None
273
else:
374
274
return False
375
if not quiet:
376
self.send_changedstate()
377
if not quiet:
378
logger.info(u"Disabling client %s", self.name)
379
if getattr(self, u"disable_initiator_tag", False):
380
gobject.source_remove(self.disable_initiator_tag)
381
self.disable_initiator_tag = None
382
if getattr(self, u"checker_initiator_tag", False):
275
if getattr(self, "stop_initiator_tag", False):
276
gobject.source_remove(self.stop_initiator_tag)
277
self.stop_initiator_tag = None
278
if getattr(self, "checker_initiator_tag", False):
383
279
gobject.source_remove(self.checker_initiator_tag)
384
280
self.checker_initiator_tag = None
385
281
self.stop_checker()
386
if self.disable_hook:
387
self.disable_hook(self)
388
self.enabled = False
282
if self.stop_hook:
283
self.stop_hook(self)
389
284
# Do not run this again if called by a gobject.timeout_add
390
285
return False
391
392
286
def __del__(self):
393
self.disable_hook = None
394
self.disable()
395
396
def checker_callback(self, pid, condition, command):
287
self.stop_hook = None
288
self.stop()
289
def checker_callback(self, pid, condition):
397
290
"""The checker has completed, so take appropriate actions."""
291
now = datetime.datetime.now()
398
292
self.checker_callback_tag = None
399
293
self.checker = None
400
if os.WIFEXITED(condition):
401
exitstatus = os.WEXITSTATUS(condition)
402
if exitstatus == 0:
403
logger.info(u"Checker for %(name)s succeeded",
404
vars(self))
405
self.checked_ok()
406
else:
407
logger.info(u"Checker for %(name)s failed",
408
vars(self))
409
else:
294
if os.WIFEXITED(condition) \
295
and (os.WEXITSTATUS(condition) == 0):
296
logger.info(u"Checker for %(name)s succeeded",
297
vars(self))
298
self.last_checked_ok = now
299
gobject.source_remove(self.stop_initiator_tag)
300
self.stop_initiator_tag = gobject.timeout_add\
301
(self._timeout_milliseconds,
302
self.stop)
303
elif not os.WIFEXITED(condition):
410
304
logger.warning(u"Checker for %(name)s crashed?",
411
305
vars(self))
412
413
def checked_ok(self):
414
"""Bump up the timeout for this client.
415
416
This should only be called when the client has been seen,
417
alive and well.
418
"""
419
self.last_checked_ok = datetime.datetime.utcnow()
420
gobject.source_remove(self.disable_initiator_tag)
421
self.disable_initiator_tag = (gobject.timeout_add
422
(self.timeout_milliseconds(),
423
self.disable))
424
306
else:
307
logger.info(u"Checker for %(name)s failed",
308
vars(self))
425
309
def start_checker(self):
426
310
"""Start a new checker subprocess if one is not running.
427
428
311
If a checker already exists, leave it running and do
429
312
nothing."""
430
313
# The reason for not killing a running checker is that if we
433
316
# client would inevitably timeout, since no checker would get
434
317
# a chance to run to completion. If we instead leave running
435
318
# checkers alone, the checker would have to take more time
436
# than 'timeout' for the client to be disabled, which is as it
437
# should be.
438
439
# If a checker exists, make sure it is not a zombie
440
try:
441
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
442
except (AttributeError, OSError), error:
443
if (isinstance(error, OSError)
444
and error.errno != errno.ECHILD):
445
raise error
446
else:
447
if pid:
448
logger.warning(u"Checker was a zombie")
449
gobject.source_remove(self.checker_callback_tag)
450
self.checker_callback(pid, status,
451
self.current_checker_command)
452
# Start a new checker if needed
319
# than 'timeout' for the client to be declared invalid, which
320
# is as it should be.
453
321
if self.checker is None:
454
322
try:
455
# In case checker_command has exactly one % operator
456
command = self.checker_command % self.host
323
# In case check_command has exactly one % operator
324
command = self.check_command % self.host
457
325
except TypeError:
458
326
# Escape attributes for the shell
459
escaped_attrs = dict(
460
(attr,
461
re.escape(unicode(str(getattr(self, attr, u"")),
462
errors=
463
u'replace')))
464
for attr in
465
self.runtime_expansions)
466
327
escaped_attrs = dict((key, re.escape(str(val)))
328
for key, val in
329
vars(self).iteritems())
467
330
try:
468
command = self.checker_command % escaped_attrs
331
command = self.check_command % escaped_attrs
469
332
except TypeError, error:
470
333
logger.error(u'Could not format string "%s":'
471
u' %s', self.checker_command, error)
334
u' %s', self.check_command, error)
472
335
return True # Try again later
473
self.current_checker_command = command
474
336
try:
475
337
logger.info(u"Starting checker %r for %s",
476
338
command, self.name)
477
# We don't need to redirect stdout and stderr, since
478
# in normal mode, that is already done by daemon(),
479
# and in debug mode we don't want to. (Stdin is
480
# always replaced by /dev/null.)
481
339
self.checker = subprocess.Popen(command,
482
340
close_fds=True,
483
shell=True, cwd=u"/")
484
self.checker_callback_tag = (gobject.child_watch_add
485
(self.checker.pid,
486
self.checker_callback,
487
data=command))
488
# The checker may have completed before the gobject
489
# watch was added. Check for this.
490
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
491
if pid:
492
gobject.source_remove(self.checker_callback_tag)
493
self.checker_callback(pid, status, command)
494
except OSError, error:
341
shell=True, cwd="/")
342
self.checker_callback_tag = gobject.child_watch_add\
343
(self.checker.pid,
344
self.checker_callback)
345
except subprocess.OSError, error:
495
346
logger.error(u"Failed to start subprocess: %s",
496
347
error)
497
348
# Re-run this periodically if run by gobject.timeout_add
498
349
return True
499
500
350
def stop_checker(self):
501
351
"""Force the checker process, if any, to stop."""
502
352
if self.checker_callback_tag:
503
353
gobject.source_remove(self.checker_callback_tag)
504
354
self.checker_callback_tag = None
505
if getattr(self, u"checker", None) is None:
355
if getattr(self, "checker", None) is None:
506
356
return
507
357
logger.debug(u"Stopping checker for %(name)s", vars(self))
508
358
try:
509
359
os.kill(self.checker.pid, signal.SIGTERM)
510
#time.sleep(0.5)
360
#os.sleep(0.5)
511
361
#if self.checker.poll() is None:
512
362
# os.kill(self.checker.pid, signal.SIGKILL)
513
363
except OSError, error:
514
364
if error.errno != errno.ESRCH: # No such process
515
365
raise
516
366
self.checker = None
517
518
def dbus_service_property(dbus_interface, signature=u"v",
519
access=u"readwrite", byte_arrays=False):
520
"""Decorators for marking methods of a DBusObjectWithProperties to
521
become properties on the D-Bus.
522
523
The decorated method will be called with no arguments by "Get"
524
and with one argument by "Set".
525
526
The parameters, where they are supported, are the same as
527
dbus.service.method, except there is only "signature", since the
528
type from Get() and the type sent to Set() is the same.
529
"""
530
# Encoding deeply encoded byte arrays is not supported yet by the
531
# "Set" method, so we fail early here:
532
if byte_arrays and signature != u"ay":
533
raise ValueError(u"Byte arrays not supported for non-'ay'"
534
u" signature %r" % signature)
535
def decorator(func):
536
func._dbus_is_property = True
537
func._dbus_interface = dbus_interface
538
func._dbus_signature = signature
539
func._dbus_access = access
540
func._dbus_name = func.__name__
541
if func._dbus_name.endswith(u"_dbus_property"):
542
func._dbus_name = func._dbus_name[:-14]
543
func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
544
return func
545
return decorator
546
547
548
class DBusPropertyException(dbus.exceptions.DBusException):
549
"""A base class for D-Bus property-related exceptions
550
"""
551
def __unicode__(self):
552
return unicode(str(self))
553
554
555
class DBusPropertyAccessException(DBusPropertyException):
556
"""A property's access permissions disallows an operation.
557
"""
558
pass
559
560
561
class DBusPropertyNotFound(DBusPropertyException):
562
"""An attempt was made to access a non-existing property.
563
"""
564
pass
565
566
567
class DBusObjectWithProperties(dbus.service.Object):
568
"""A D-Bus object with properties.
569
570
Classes inheriting from this can use the dbus_service_property
571
decorator to expose methods as D-Bus properties. It exposes the
572
standard Get(), Set(), and GetAll() methods on the D-Bus.
573
"""
574
575
@staticmethod
576
def _is_dbus_property(obj):
577
return getattr(obj, u"_dbus_is_property", False)
578
579
def _get_all_dbus_properties(self):
580
"""Returns a generator of (name, attribute) pairs
581
"""
582
return ((prop._dbus_name, prop)
583
for name, prop in
584
inspect.getmembers(self, self._is_dbus_property))
585
586
def _get_dbus_property(self, interface_name, property_name):
587
"""Returns a bound method if one exists which is a D-Bus
588
property with the specified name and interface.
589
"""
590
for name in (property_name,
591
property_name + u"_dbus_property"):
592
prop = getattr(self, name, None)
593
if (prop is None
594
or not self._is_dbus_property(prop)
595
or prop._dbus_name != property_name
596
or (interface_name and prop._dbus_interface
597
and interface_name != prop._dbus_interface)):
598
continue
599
return prop
600
# No such property
601
raise DBusPropertyNotFound(self.dbus_object_path + u":"
602
+ interface_name + u"."
603
+ property_name)
604
605
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
606
out_signature=u"v")
607
def Get(self, interface_name, property_name):
608
"""Standard D-Bus property Get() method, see D-Bus standard.
609
"""
610
prop = self._get_dbus_property(interface_name, property_name)
611
if prop._dbus_access == u"write":
612
raise DBusPropertyAccessException(property_name)
613
value = prop()
614
if not hasattr(value, u"variant_level"):
615
return value
616
return type(value)(value, variant_level=value.variant_level+1)
617
618
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
619
def Set(self, interface_name, property_name, value):
620
"""Standard D-Bus property Set() method, see D-Bus standard.
621
"""
622
prop = self._get_dbus_property(interface_name, property_name)
623
if prop._dbus_access == u"read":
624
raise DBusPropertyAccessException(property_name)
625
if prop._dbus_get_args_options[u"byte_arrays"]:
626
# The byte_arrays option is not supported yet on
627
# signatures other than "ay".
628
if prop._dbus_signature != u"ay":
629
raise ValueError
630
value = dbus.ByteArray(''.join(unichr(byte)
631
for byte in value))
632
prop(value)
633
634
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
635
out_signature=u"a{sv}")
636
def GetAll(self, interface_name):
637
"""Standard D-Bus property GetAll() method, see D-Bus
638
standard.
639
640
Note: Will not include properties with access="write".
641
"""
642
all = {}
643
for name, prop in self._get_all_dbus_properties():
644
if (interface_name
645
and interface_name != prop._dbus_interface):
646
# Interface non-empty but did not match
647
continue
648
# Ignore write-only properties
649
if prop._dbus_access == u"write":
650
continue
651
value = prop()
652
if not hasattr(value, u"variant_level"):
653
all[name] = value
654
continue
655
all[name] = type(value)(value, variant_level=
656
value.variant_level+1)
657
return dbus.Dictionary(all, signature=u"sv")
658
659
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
660
out_signature=u"s",
661
path_keyword='object_path',
662
connection_keyword='connection')
663
def Introspect(self, object_path, connection):
664
"""Standard D-Bus method, overloaded to insert property tags.
665
"""
666
xmlstring = dbus.service.Object.Introspect(self, object_path,
667
connection)
668
try:
669
document = xml.dom.minidom.parseString(xmlstring)
670
def make_tag(document, name, prop):
671
e = document.createElement(u"property")
672
e.setAttribute(u"name", name)
673
e.setAttribute(u"type", prop._dbus_signature)
674
e.setAttribute(u"access", prop._dbus_access)
675
return e
676
for if_tag in document.getElementsByTagName(u"interface"):
677
for tag in (make_tag(document, name, prop)
678
for name, prop
679
in self._get_all_dbus_properties()
680
if prop._dbus_interface
681
== if_tag.getAttribute(u"name")):
682
if_tag.appendChild(tag)
683
# Add the names to the return values for the
684
# "org.freedesktop.DBus.Properties" methods
685
if (if_tag.getAttribute(u"name")
686
== u"org.freedesktop.DBus.Properties"):
687
for cn in if_tag.getElementsByTagName(u"method"):
688
if cn.getAttribute(u"name") == u"Get":
689
for arg in cn.getElementsByTagName(u"arg"):
690
if (arg.getAttribute(u"direction")
691
== u"out"):
692
arg.setAttribute(u"name", u"value")
693
elif cn.getAttribute(u"name") == u"GetAll":
694
for arg in cn.getElementsByTagName(u"arg"):
695
if (arg.getAttribute(u"direction")
696
== u"out"):
697
arg.setAttribute(u"name", u"props")
698
xmlstring = document.toxml(u"utf-8")
699
document.unlink()
700
except (AttributeError, xml.dom.DOMException,
701
xml.parsers.expat.ExpatError), error:
702
logger.error(u"Failed to override Introspection method",
703
error)
704
return xmlstring
705
706
707
class ClientDBus(Client, DBusObjectWithProperties):
708
"""A Client class using D-Bus
709
710
Attributes:
711
dbus_object_path: dbus.ObjectPath
712
bus: dbus.SystemBus()
713
"""
714
715
runtime_expansions = (Client.runtime_expansions
716
+ (u"dbus_object_path",))
717
718
# dbus.service.Object doesn't use super(), so we can't either.
719
720
def __init__(self, bus = None, *args, **kwargs):
721
self._approvals_pending = 0
722
self.bus = bus
723
Client.__init__(self, *args, **kwargs)
724
# Only now, when this client is initialized, can it show up on
725
# the D-Bus
726
client_object_name = unicode(self.name).translate(
727
{ord(u"."): ord(u"_"),
728
ord(u"-"): ord(u"_")})
729
self.dbus_object_path = (dbus.ObjectPath
730
(u"/clients/" + client_object_name))
731
DBusObjectWithProperties.__init__(self, self.bus,
732
self.dbus_object_path)
733
734
def _get_approvals_pending(self):
735
return self._approvals_pending
736
def _set_approvals_pending(self, value):
737
old_value = self._approvals_pending
738
self._approvals_pending = value
739
bval = bool(value)
740
if (hasattr(self, "dbus_object_path")
741
and bval is not bool(old_value)):
742
dbus_bool = dbus.Boolean(bval, variant_level=1)
743
self.PropertyChanged(dbus.String(u"ApprovalPending"),
744
dbus_bool)
745
746
approvals_pending = property(_get_approvals_pending,
747
_set_approvals_pending)
748
del _get_approvals_pending, _set_approvals_pending
749
750
@staticmethod
751
def _datetime_to_dbus(dt, variant_level=0):
752
"""Convert a UTC datetime.datetime() to a D-Bus type."""
753
return dbus.String(dt.isoformat(),
754
variant_level=variant_level)
755
756
def enable(self):
757
oldstate = getattr(self, u"enabled", False)
758
r = Client.enable(self)
759
if oldstate != self.enabled:
760
# Emit D-Bus signals
761
self.PropertyChanged(dbus.String(u"Enabled"),
762
dbus.Boolean(True, variant_level=1))
763
self.PropertyChanged(
764
dbus.String(u"LastEnabled"),
765
self._datetime_to_dbus(self.last_enabled,
766
variant_level=1))
767
return r
768
769
def disable(self, quiet = False):
770
oldstate = getattr(self, u"enabled", False)
771
r = Client.disable(self, quiet=quiet)
772
if not quiet and oldstate != self.enabled:
773
# Emit D-Bus signal
774
self.PropertyChanged(dbus.String(u"Enabled"),
775
dbus.Boolean(False, variant_level=1))
776
return r
777
778
def __del__(self, *args, **kwargs):
779
try:
780
self.remove_from_connection()
781
except LookupError:
782
pass
783
if hasattr(DBusObjectWithProperties, u"__del__"):
784
DBusObjectWithProperties.__del__(self, *args, **kwargs)
785
Client.__del__(self, *args, **kwargs)
786
787
def checker_callback(self, pid, condition, command,
788
*args, **kwargs):
789
self.checker_callback_tag = None
790
self.checker = None
791
# Emit D-Bus signal
792
self.PropertyChanged(dbus.String(u"CheckerRunning"),
793
dbus.Boolean(False, variant_level=1))
794
if os.WIFEXITED(condition):
795
exitstatus = os.WEXITSTATUS(condition)
796
# Emit D-Bus signal
797
self.CheckerCompleted(dbus.Int16(exitstatus),
798
dbus.Int64(condition),
799
dbus.String(command))
800
else:
801
# Emit D-Bus signal
802
self.CheckerCompleted(dbus.Int16(-1),
803
dbus.Int64(condition),
804
dbus.String(command))
805
806
return Client.checker_callback(self, pid, condition, command,
807
*args, **kwargs)
808
809
def checked_ok(self, *args, **kwargs):
810
r = Client.checked_ok(self, *args, **kwargs)
811
# Emit D-Bus signal
812
self.PropertyChanged(
813
dbus.String(u"LastCheckedOK"),
814
(self._datetime_to_dbus(self.last_checked_ok,
815
variant_level=1)))
816
return r
817
818
def start_checker(self, *args, **kwargs):
819
old_checker = self.checker
820
if self.checker is not None:
821
old_checker_pid = self.checker.pid
822
else:
823
old_checker_pid = None
824
r = Client.start_checker(self, *args, **kwargs)
825
# Only if new checker process was started
826
if (self.checker is not None
827
and old_checker_pid != self.checker.pid):
828
# Emit D-Bus signal
829
self.CheckerStarted(self.current_checker_command)
830
self.PropertyChanged(
831
dbus.String(u"CheckerRunning"),
832
dbus.Boolean(True, variant_level=1))
833
return r
834
835
def stop_checker(self, *args, **kwargs):
836
old_checker = getattr(self, u"checker", None)
837
r = Client.stop_checker(self, *args, **kwargs)
838
if (old_checker is not None
839
and getattr(self, u"checker", None) is None):
840
self.PropertyChanged(dbus.String(u"CheckerRunning"),
841
dbus.Boolean(False, variant_level=1))
842
return r
843
844
def _reset_approved(self):
845
self._approved = None
846
return False
847
848
def approve(self, value=True):
849
self.send_changedstate()
850
self._approved = value
851
gobject.timeout_add(self._timedelta_to_milliseconds
852
(self.approval_duration),
853
self._reset_approved)
854
855
856
## D-Bus methods, signals & properties
857
_interface = u"se.bsnet.fukt.Mandos.Client"
858
859
## Signals
860
861
# CheckerCompleted - signal
862
@dbus.service.signal(_interface, signature=u"nxs")
863
def CheckerCompleted(self, exitcode, waitstatus, command):
864
"D-Bus signal"
865
pass
866
867
# CheckerStarted - signal
868
@dbus.service.signal(_interface, signature=u"s")
869
def CheckerStarted(self, command):
870
"D-Bus signal"
871
pass
872
873
# PropertyChanged - signal
874
@dbus.service.signal(_interface, signature=u"sv")
875
def PropertyChanged(self, property, value):
876
"D-Bus signal"
877
pass
878
879
# GotSecret - signal
880
@dbus.service.signal(_interface)
881
def GotSecret(self):
882
"""D-Bus signal
883
Is sent after a successful transfer of secret from the Mandos
884
server to mandos-client
885
"""
886
pass
887
888
# Rejected - signal
889
@dbus.service.signal(_interface, signature=u"s")
890
def Rejected(self, reason):
891
"D-Bus signal"
892
pass
893
894
# NeedApproval - signal
895
@dbus.service.signal(_interface, signature=u"tb")
896
def NeedApproval(self, timeout, default):
897
"D-Bus signal"
898
pass
899
900
## Methods
901
902
# Approve - method
903
@dbus.service.method(_interface, in_signature=u"b")
904
def Approve(self, value):
905
self.approve(value)
906
907
# CheckedOK - method
908
@dbus.service.method(_interface)
909
def CheckedOK(self):
910
return self.checked_ok()
911
912
# Enable - method
913
@dbus.service.method(_interface)
914
def Enable(self):
915
"D-Bus method"
916
self.enable()
917
918
# StartChecker - method
919
@dbus.service.method(_interface)
920
def StartChecker(self):
921
"D-Bus method"
922
self.start_checker()
923
924
# Disable - method
925
@dbus.service.method(_interface)
926
def Disable(self):
927
"D-Bus method"
928
self.disable()
929
930
# StopChecker - method
931
@dbus.service.method(_interface)
932
def StopChecker(self):
933
self.stop_checker()
934
935
## Properties
936
937
# ApprovalPending - property
938
@dbus_service_property(_interface, signature=u"b", access=u"read")
939
def ApprovalPending_dbus_property(self):
940
return dbus.Boolean(bool(self.approvals_pending))
941
942
# ApprovedByDefault - property
943
@dbus_service_property(_interface, signature=u"b",
944
access=u"readwrite")
945
def ApprovedByDefault_dbus_property(self, value=None):
946
if value is None: # get
947
return dbus.Boolean(self.approved_by_default)
948
self.approved_by_default = bool(value)
949
# Emit D-Bus signal
950
self.PropertyChanged(dbus.String(u"ApprovedByDefault"),
951
dbus.Boolean(value, variant_level=1))
952
953
# ApprovalDelay - property
954
@dbus_service_property(_interface, signature=u"t",
955
access=u"readwrite")
956
def ApprovalDelay_dbus_property(self, value=None):
957
if value is None: # get
958
return dbus.UInt64(self.approval_delay_milliseconds())
959
self.approval_delay = datetime.timedelta(0, 0, 0, value)
960
# Emit D-Bus signal
961
self.PropertyChanged(dbus.String(u"ApprovalDelay"),
962
dbus.UInt64(value, variant_level=1))
963
964
# ApprovalDuration - property
965
@dbus_service_property(_interface, signature=u"t",
966
access=u"readwrite")
967
def ApprovalDuration_dbus_property(self, value=None):
968
if value is None: # get
969
return dbus.UInt64(self._timedelta_to_milliseconds(
970
self.approval_duration))
971
self.approval_duration = datetime.timedelta(0, 0, 0, value)
972
# Emit D-Bus signal
973
self.PropertyChanged(dbus.String(u"ApprovalDuration"),
974
dbus.UInt64(value, variant_level=1))
975
976
# Name - property
977
@dbus_service_property(_interface, signature=u"s", access=u"read")
978
def Name_dbus_property(self):
979
return dbus.String(self.name)
980
981
# Fingerprint - property
982
@dbus_service_property(_interface, signature=u"s", access=u"read")
983
def Fingerprint_dbus_property(self):
984
return dbus.String(self.fingerprint)
985
986
# Host - property
987
@dbus_service_property(_interface, signature=u"s",
988
access=u"readwrite")
989
def Host_dbus_property(self, value=None):
990
if value is None: # get
991
return dbus.String(self.host)
992
self.host = value
993
# Emit D-Bus signal
994
self.PropertyChanged(dbus.String(u"Host"),
995
dbus.String(value, variant_level=1))
996
997
# Created - property
998
@dbus_service_property(_interface, signature=u"s", access=u"read")
999
def Created_dbus_property(self):
1000
return dbus.String(self._datetime_to_dbus(self.created))
1001
1002
# LastEnabled - property
1003
@dbus_service_property(_interface, signature=u"s", access=u"read")
1004
def LastEnabled_dbus_property(self):
1005
if self.last_enabled is None:
1006
return dbus.String(u"")
1007
return dbus.String(self._datetime_to_dbus(self.last_enabled))
1008
1009
# Enabled - property
1010
@dbus_service_property(_interface, signature=u"b",
1011
access=u"readwrite")
1012
def Enabled_dbus_property(self, value=None):
1013
if value is None: # get
1014
return dbus.Boolean(self.enabled)
1015
if value:
1016
self.enable()
1017
else:
1018
self.disable()
1019
1020
# LastCheckedOK - property
1021
@dbus_service_property(_interface, signature=u"s",
1022
access=u"readwrite")
1023
def LastCheckedOK_dbus_property(self, value=None):
1024
if value is not None:
1025
self.checked_ok()
1026
return
367
def still_valid(self):
368
"""Has the timeout not yet passed for this client?"""
369
now = datetime.datetime.now()
1027
370
if self.last_checked_ok is None:
1028
return dbus.String(u"")
1029
return dbus.String(self._datetime_to_dbus(self
1030
.last_checked_ok))
1031
1032
# Timeout - property
1033
@dbus_service_property(_interface, signature=u"t",
1034
access=u"readwrite")
1035
def Timeout_dbus_property(self, value=None):
1036
if value is None: # get
1037
return dbus.UInt64(self.timeout_milliseconds())
1038
self.timeout = datetime.timedelta(0, 0, 0, value)
1039
# Emit D-Bus signal
1040
self.PropertyChanged(dbus.String(u"Timeout"),
1041
dbus.UInt64(value, variant_level=1))
1042
if getattr(self, u"disable_initiator_tag", None) is None:
1043
return
1044
# Reschedule timeout
1045
gobject.source_remove(self.disable_initiator_tag)
1046
self.disable_initiator_tag = None
1047
time_to_die = (self.
1048
_timedelta_to_milliseconds((self
1049
.last_checked_ok
1050
+ self.timeout)
1051
- datetime.datetime
1052
.utcnow()))
1053
if time_to_die <= 0:
1054
# The timeout has passed
1055
self.disable()
1056
else:
1057
self.disable_initiator_tag = (gobject.timeout_add
1058
(time_to_die, self.disable))
1059
1060
# Interval - property
1061
@dbus_service_property(_interface, signature=u"t",
1062
access=u"readwrite")
1063
def Interval_dbus_property(self, value=None):
1064
if value is None: # get
1065
return dbus.UInt64(self.interval_milliseconds())
1066
self.interval = datetime.timedelta(0, 0, 0, value)
1067
# Emit D-Bus signal
1068
self.PropertyChanged(dbus.String(u"Interval"),
1069
dbus.UInt64(value, variant_level=1))
1070
if getattr(self, u"checker_initiator_tag", None) is None:
1071
return
1072
# Reschedule checker run
1073
gobject.source_remove(self.checker_initiator_tag)
1074
self.checker_initiator_tag = (gobject.timeout_add
1075
(value, self.start_checker))
1076
self.start_checker() # Start one now, too
1077
1078
# Checker - property
1079
@dbus_service_property(_interface, signature=u"s",
1080
access=u"readwrite")
1081
def Checker_dbus_property(self, value=None):
1082
if value is None: # get
1083
return dbus.String(self.checker_command)
1084
self.checker_command = value
1085
# Emit D-Bus signal
1086
self.PropertyChanged(dbus.String(u"Checker"),
1087
dbus.String(self.checker_command,
1088
variant_level=1))
1089
1090
# CheckerRunning - property
1091
@dbus_service_property(_interface, signature=u"b",
1092
access=u"readwrite")
1093
def CheckerRunning_dbus_property(self, value=None):
1094
if value is None: # get
1095
return dbus.Boolean(self.checker is not None)
1096
if value:
1097
self.start_checker()
1098
else:
1099
self.stop_checker()
1100
1101
# ObjectPath - property
1102
@dbus_service_property(_interface, signature=u"o", access=u"read")
1103
def ObjectPath_dbus_property(self):
1104
return self.dbus_object_path # is already a dbus.ObjectPath
1105
1106
# Secret = property
1107
@dbus_service_property(_interface, signature=u"ay",
1108
access=u"write", byte_arrays=True)
1109
def Secret_dbus_property(self, value):
1110
self.secret = str(value)
1111
1112
del _interface
1113
1114
1115
class ProxyClient(object):
1116
def __init__(self, child_pipe, fpr, address):
1117
self._pipe = child_pipe
1118
self._pipe.send(('init', fpr, address))
1119
if not self._pipe.recv():
1120
raise KeyError()
1121
1122
def __getattribute__(self, name):
1123
if(name == '_pipe'):
1124
return super(ProxyClient, self).__getattribute__(name)
1125
self._pipe.send(('getattr', name))
1126
data = self._pipe.recv()
1127
if data[0] == 'data':
1128
return data[1]
1129
if data[0] == 'function':
1130
def func(*args, **kwargs):
1131
self._pipe.send(('funcall', name, args, kwargs))
1132
return self._pipe.recv()[1]
1133
return func
1134
1135
def __setattr__(self, name, value):
1136
if(name == '_pipe'):
1137
return super(ProxyClient, self).__setattr__(name, value)
1138
self._pipe.send(('setattr', name, value))
1139
1140
1141
class ClientHandler(socketserver.BaseRequestHandler, object):
1142
"""A class to handle client connections.
1143
1144
Instantiated once for each connection to handle it.
371
return now < (self.created + self.timeout)
372
else:
373
return now < (self.last_checked_ok + self.timeout)
374
375
376
def peer_certificate(session):
377
"Return the peer's OpenPGP certificate as a bytestring"
378
# If not an OpenPGP certificate...
379
if gnutls.library.functions.gnutls_certificate_type_get\
380
(session._c_object) \
381
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
382
# ...do the normal thing
383
return session.peer_certificate
384
list_size = ctypes.c_uint()
385
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
386
(session._c_object, ctypes.byref(list_size))
387
if list_size.value == 0:
388
return None
389
cert = cert_list[0]
390
return ctypes.string_at(cert.data, cert.size)
391
392
393
def fingerprint(openpgp):
394
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
395
# New GnuTLS "datum" with the OpenPGP public key
396
datum = gnutls.library.types.gnutls_datum_t\
397
(ctypes.cast(ctypes.c_char_p(openpgp),
398
ctypes.POINTER(ctypes.c_ubyte)),
399
ctypes.c_uint(len(openpgp)))
400
# New empty GnuTLS certificate
401
crt = gnutls.library.types.gnutls_openpgp_crt_t()
402
gnutls.library.functions.gnutls_openpgp_crt_init\
403
(ctypes.byref(crt))
404
# Import the OpenPGP public key into the certificate
405
gnutls.library.functions.gnutls_openpgp_crt_import\
406
(crt, ctypes.byref(datum),
407
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
# New buffer for the fingerprint
409
buffer = ctypes.create_string_buffer(20)
410
buffer_length = ctypes.c_size_t()
411
# Get the fingerprint from the certificate into the buffer
412
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
413
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
414
# Deinit the certificate
415
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
416
# Convert the buffer to a Python bytestring
417
fpr = ctypes.string_at(buffer, buffer_length.value)
418
# Convert the bytestring to hexadecimal notation
419
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
420
return hex_fpr
421
422
423
class tcp_handler(SocketServer.BaseRequestHandler, object):
424
"""A TCP request handler class.
425
Instantiated by IPv6_TCPServer for each request to handle it.
1145
426
Note: This will run in its own forked process."""
1146
427
1147
428
def handle(self):
1148
with contextlib.closing(self.server.child_pipe) as child_pipe:
1149
logger.info(u"TCP connection from: %s",
1150
unicode(self.client_address))
1151
logger.debug(u"Pipe FD: %d",
1152
self.server.child_pipe.fileno())
1153
1154
session = (gnutls.connection
1155
.ClientSession(self.request,
1156
gnutls.connection
1157
.X509Credentials()))
1158
1159
# Note: gnutls.connection.X509Credentials is really a
1160
# generic GnuTLS certificate credentials object so long as
1161
# no X.509 keys are added to it. Therefore, we can use it
1162
# here despite using OpenPGP certificates.
1163
1164
#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
1165
# u"+AES-256-CBC", u"+SHA1",
1166
# u"+COMP-NULL", u"+CTYPE-OPENPGP",
1167
# u"+DHE-DSS"))
1168
# Use a fallback default, since this MUST be set.
1169
priority = self.server.gnutls_priority
1170
if priority is None:
1171
priority = u"NORMAL"
1172
(gnutls.library.functions
1173
.gnutls_priority_set_direct(session._c_object,
1174
priority, None))
1175
1176
# Start communication using the Mandos protocol
1177
# Get protocol number
1178
line = self.request.makefile().readline()
1179
logger.debug(u"Protocol version: %r", line)
1180
try:
1181
if int(line.strip().split()[0]) > 1:
1182
raise RuntimeError
1183
except (ValueError, IndexError, RuntimeError), error:
1184
logger.error(u"Unknown protocol version: %s", error)
1185
return
1186
1187
# Start GnuTLS connection
1188
try:
1189
session.handshake()
1190
except gnutls.errors.GNUTLSError, error:
1191
logger.warning(u"Handshake failed: %s", error)
1192
# Do not run session.bye() here: the session is not
1193
# established. Just abandon the request.
1194
return
1195
logger.debug(u"Handshake succeeded")
1196
1197
approval_required = False
1198
try:
1199
try:
1200
fpr = self.fingerprint(self.peer_certificate
1201
(session))
1202
except (TypeError, gnutls.errors.GNUTLSError), error:
1203
logger.warning(u"Bad certificate: %s", error)
1204
return
1205
logger.debug(u"Fingerprint: %s", fpr)
1206
1207
try:
1208
client = ProxyClient(child_pipe, fpr,
1209
self.client_address)
1210
except KeyError:
1211
return
1212
1213
if client.approval_delay:
1214
delay = client.approval_delay
1215
client.approvals_pending += 1
1216
approval_required = True
1217
1218
while True:
1219
if not client.enabled:
1220
logger.warning(u"Client %s is disabled",
1221
client.name)
1222
if self.server.use_dbus:
1223
# Emit D-Bus signal
1224
client.Rejected("Disabled")
1225
return
1226
1227
if client._approved or not client.approval_delay:
1228
#We are approved or approval is disabled
1229
break
1230
elif client._approved is None:
1231
logger.info(u"Client %s needs approval",
1232
client.name)
1233
if self.server.use_dbus:
1234
# Emit D-Bus signal
1235
client.NeedApproval(
1236
client.approval_delay_milliseconds(),
1237
client.approved_by_default)
1238
else:
1239
logger.warning(u"Client %s was not approved",
1240
client.name)
1241
if self.server.use_dbus:
1242
# Emit D-Bus signal
1243
client.Rejected("Denied")
1244
return
1245
1246
#wait until timeout or approved
1247
#x = float(client._timedelta_to_milliseconds(delay))
1248
time = datetime.datetime.now()
1249
client.changedstate.acquire()
1250
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1251
client.changedstate.release()
1252
time2 = datetime.datetime.now()
1253
if (time2 - time) >= delay:
1254
if not client.approved_by_default:
1255
logger.warning("Client %s timed out while"
1256
" waiting for approval",
1257
client.name)
1258
if self.server.use_dbus:
1259
# Emit D-Bus signal
1260
client.Rejected("Approval timed out")
1261
return
1262
else:
1263
break
1264
else:
1265
delay -= time2 - time
1266
1267
sent_size = 0
1268
while sent_size < len(client.secret):
1269
try:
1270
sent = session.send(client.secret[sent_size:])
1271
except (gnutls.errors.GNUTLSError), error:
1272
logger.warning("gnutls send failed")
1273
return
1274
logger.debug(u"Sent: %d, remaining: %d",
1275
sent, len(client.secret)
1276
- (sent_size + sent))
1277
sent_size += sent
1278
1279
logger.info(u"Sending secret to %s", client.name)
1280
# bump the timeout as if seen
1281
client.checked_ok()
1282
if self.server.use_dbus:
1283
# Emit D-Bus signal
1284
client.GotSecret()
1285
1286
finally:
1287
if approval_required:
1288
client.approvals_pending -= 1
1289
try:
1290
session.bye()
1291
except (gnutls.errors.GNUTLSError), error:
1292
logger.warning("GnuTLS bye failed")
1293
1294
@staticmethod
1295
def peer_certificate(session):
1296
"Return the peer's OpenPGP certificate as a bytestring"
1297
# If not an OpenPGP certificate...
1298
if (gnutls.library.functions
1299
.gnutls_certificate_type_get(session._c_object)
1300
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1301
# ...do the normal thing
1302
return session.peer_certificate
1303
list_size = ctypes.c_uint(1)
1304
cert_list = (gnutls.library.functions
1305
.gnutls_certificate_get_peers
1306
(session._c_object, ctypes.byref(list_size)))
1307
if not bool(cert_list) and list_size.value != 0:
1308
raise gnutls.errors.GNUTLSError(u"error getting peer"
1309
u" certificate")
1310
if list_size.value == 0:
1311
return None
1312
cert = cert_list[0]
1313
return ctypes.string_at(cert.data, cert.size)
1314
1315
@staticmethod
1316
def fingerprint(openpgp):
1317
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1318
# New GnuTLS "datum" with the OpenPGP public key
1319
datum = (gnutls.library.types
1320
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1321
ctypes.POINTER
1322
(ctypes.c_ubyte)),
1323
ctypes.c_uint(len(openpgp))))
1324
# New empty GnuTLS certificate
1325
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1326
(gnutls.library.functions
1327
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1328
# Import the OpenPGP public key into the certificate
1329
(gnutls.library.functions
1330
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1331
gnutls.library.constants
1332
.GNUTLS_OPENPGP_FMT_RAW))
1333
# Verify the self signature in the key
1334
crtverify = ctypes.c_uint()
1335
(gnutls.library.functions
1336
.gnutls_openpgp_crt_verify_self(crt, 0,
1337
ctypes.byref(crtverify)))
1338
if crtverify.value != 0:
1339
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1340
raise (gnutls.errors.CertificateSecurityError
1341
(u"Verify failed"))
1342
# New buffer for the fingerprint
1343
buf = ctypes.create_string_buffer(20)
1344
buf_len = ctypes.c_size_t()
1345
# Get the fingerprint from the certificate into the buffer
1346
(gnutls.library.functions
1347
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1348
ctypes.byref(buf_len)))
1349
# Deinit the certificate
1350
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1351
# Convert the buffer to a Python bytestring
1352
fpr = ctypes.string_at(buf, buf_len.value)
1353
# Convert the bytestring to hexadecimal notation
1354
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1355
return hex_fpr
1356
1357
1358
class MultiprocessingMixIn(object):
1359
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1360
def sub_process_main(self, request, address):
1361
try:
1362
self.finish_request(request, address)
1363
except:
1364
self.handle_error(request, address)
1365
self.close_request(request)
1366
1367
def process_request(self, request, address):
1368
"""Start a new process to process the request."""
1369
multiprocessing.Process(target = self.sub_process_main,
1370
args = (request, address)).start()
1371
1372
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1373
""" adds a pipe to the MixIn """
1374
def process_request(self, request, client_address):
1375
"""Overrides and wraps the original process_request().
1376
1377
This function creates a new pipe in self.pipe
1378
"""
1379
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1380
1381
super(MultiprocessingMixInWithPipe,
1382
self).process_request(request, client_address)
1383
self.child_pipe.close()
1384
self.add_pipe(parent_pipe)
1385
1386
def add_pipe(self, parent_pipe):
1387
"""Dummy function; override as necessary"""
1388
pass
1389
1390
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1391
socketserver.TCPServer, object):
1392
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1393
429
logger.info(u"TCP connection from: %s",
430
unicode(self.client_address))
431
session = gnutls.connection.ClientSession\
432
(self.request, gnutls.connection.X509Credentials())
433
434
line = self.request.makefile().readline()
435
logger.debug(u"Protocol version: %r", line)
436
try:
437
if int(line.strip().split()[0]) > 1:
438
raise RuntimeError
439
except (ValueError, IndexError, RuntimeError), error:
440
logger.error(u"Unknown protocol version: %s", error)
441
return
442
443
# Note: gnutls.connection.X509Credentials is really a generic
444
# GnuTLS certificate credentials object so long as no X.509
445
# keys are added to it. Therefore, we can use it here despite
446
# using OpenPGP certificates.
447
448
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
449
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
450
# "+DHE-DSS"))
451
priority = "NORMAL" # Fallback default, since this
452
# MUST be set.
453
if self.server.settings["priority"]:
454
priority = self.server.settings["priority"]
455
gnutls.library.functions.gnutls_priority_set_direct\
456
(session._c_object, priority, None);
457
458
try:
459
session.handshake()
460
except gnutls.errors.GNUTLSError, error:
461
logger.warning(u"Handshake failed: %s", error)
462
# Do not run session.bye() here: the session is not
463
# established. Just abandon the request.
464
return
465
try:
466
fpr = fingerprint(peer_certificate(session))
467
except (TypeError, gnutls.errors.GNUTLSError), error:
468
logger.warning(u"Bad certificate: %s", error)
469
session.bye()
470
return
471
logger.debug(u"Fingerprint: %s", fpr)
472
client = None
473
for c in self.server.clients:
474
if c.fingerprint == fpr:
475
client = c
476
break
477
if not client:
478
logger.warning(u"Client not found for fingerprint: %s",
479
fpr)
480
session.bye()
481
return
482
# Have to check if client.still_valid(), since it is possible
483
# that the client timed out while establishing the GnuTLS
484
# session.
485
if not client.still_valid():
486
logger.warning(u"Client %(name)s is invalid",
487
vars(client))
488
session.bye()
489
return
490
sent_size = 0
491
while sent_size < len(client.secret):
492
sent = session.send(client.secret[sent_size:])
493
logger.debug(u"Sent: %d, remaining: %d",
494
sent, len(client.secret)
495
- (sent_size + sent))
496
sent_size += sent
497
session.bye()
498
499
500
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
501
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1394
502
Attributes:
1395
enabled: Boolean; whether this server is activated yet
1396
interface: None or a network interface name (string)
1397
use_ipv6: Boolean; to use IPv6 or not
503
settings: Server settings
504
clients: Set() of Client objects
1398
505
"""
1399
def __init__(self, server_address, RequestHandlerClass,
1400
interface=None, use_ipv6=True):
1401
self.interface = interface
1402
if use_ipv6:
1403
self.address_family = socket.AF_INET6
1404
socketserver.TCPServer.__init__(self, server_address,
1405
RequestHandlerClass)
506
address_family = socket.AF_INET6
507
def __init__(self, *args, **kwargs):
508
if "settings" in kwargs:
509
self.settings = kwargs["settings"]
510
del kwargs["settings"]
511
if "clients" in kwargs:
512
self.clients = kwargs["clients"]
513
del kwargs["clients"]
514
return super(type(self), self).__init__(*args, **kwargs)
1406
515
def server_bind(self):
1407
516
"""This overrides the normal server_bind() function
1408
517
to bind to an interface if one was specified, and also NOT to
1409
518
bind to an address or port if they were not specified."""
1410
if self.interface is not None:
1411
if SO_BINDTODEVICE is None:
1412
logger.error(u"SO_BINDTODEVICE does not exist;"
1413
u" cannot bind to interface %s",
1414
self.interface)
1415
else:
1416
try:
1417
self.socket.setsockopt(socket.SOL_SOCKET,
1418
SO_BINDTODEVICE,
1419
str(self.interface
1420
+ u'\0'))
1421
except socket.error, error:
1422
if error[0] == errno.EPERM:
1423
logger.error(u"No permission to"
1424
u" bind to interface %s",
1425
self.interface)
1426
elif error[0] == errno.ENOPROTOOPT:
1427
logger.error(u"SO_BINDTODEVICE not available;"
1428
u" cannot bind to interface %s",
1429
self.interface)
1430
else:
1431
raise
519
if self.settings["interface"]:
520
# 25 is from /usr/include/asm-i486/socket.h
521
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
522
try:
523
self.socket.setsockopt(socket.SOL_SOCKET,
524
SO_BINDTODEVICE,
525
self.settings["interface"])
526
except socket.error, error:
527
if error[0] == errno.EPERM:
528
logger.error(u"No permission to"
529
u" bind to interface %s",
530
self.settings["interface"])
531
else:
532
raise error
1432
533
# Only bind(2) the socket if we really need to.
1433
534
if self.server_address[0] or self.server_address[1]:
1434
535
if not self.server_address[0]:
1435
if self.address_family == socket.AF_INET6:
1436
any_address = u"::" # in6addr_any
1437
else:
1438
any_address = socket.INADDR_ANY
1439
self.server_address = (any_address,
536
in6addr_any = "::"
537
self.server_address = (in6addr_any,
1440
538
self.server_address[1])
1441
539
elif not self.server_address[1]:
1442
540
self.server_address = (self.server_address[0],
1443
541
0)
1444
# if self.interface:
542
# if self.settings["interface"]:
1445
543
# self.server_address = (self.server_address[0],
1446
544
# 0, # port
1447
545
# 0, # flowinfo
1448
546
# if_nametoindex
1449
# (self.interface))
1450
return socketserver.TCPServer.server_bind(self)
1451
1452
1453
class MandosServer(IPv6_TCPServer):
1454
"""Mandos server.
1455
1456
Attributes:
1457
clients: set of Client objects
1458
gnutls_priority GnuTLS priority string
1459
use_dbus: Boolean; to emit D-Bus signals or not
1460
1461
Assumes a gobject.MainLoop event loop.
1462
"""
1463
def __init__(self, server_address, RequestHandlerClass,
1464
interface=None, use_ipv6=True, clients=None,
1465
gnutls_priority=None, use_dbus=True):
1466
self.enabled = False
1467
self.clients = clients
1468
if self.clients is None:
1469
self.clients = set()
1470
self.use_dbus = use_dbus
1471
self.gnutls_priority = gnutls_priority
1472
IPv6_TCPServer.__init__(self, server_address,
1473
RequestHandlerClass,
1474
interface = interface,
1475
use_ipv6 = use_ipv6)
1476
def server_activate(self):
1477
if self.enabled:
1478
return socketserver.TCPServer.server_activate(self)
1479
def enable(self):
1480
self.enabled = True
1481
def add_pipe(self, parent_pipe):
1482
# Call "handle_ipc" for both data and EOF events
1483
gobject.io_add_watch(parent_pipe.fileno(),
1484
gobject.IO_IN | gobject.IO_HUP,
1485
functools.partial(self.handle_ipc,
1486
parent_pipe = parent_pipe))
1487
1488
def handle_ipc(self, source, condition, parent_pipe=None,
1489
client_object=None):
1490
condition_names = {
1491
gobject.IO_IN: u"IN", # There is data to read.
1492
gobject.IO_OUT: u"OUT", # Data can be written (without
1493
# blocking).
1494
gobject.IO_PRI: u"PRI", # There is urgent data to read.
1495
gobject.IO_ERR: u"ERR", # Error condition.
1496
gobject.IO_HUP: u"HUP" # Hung up (the connection has been
1497
# broken, usually for pipes and
1498
# sockets).
1499
}
1500
conditions_string = ' | '.join(name
1501
for cond, name in
1502
condition_names.iteritems()
1503
if cond & condition)
1504
# error or the other end of multiprocessing.Pipe has closed
1505
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1506
return False
1507
1508
# Read a request from the child
1509
request = parent_pipe.recv()
1510
command = request[0]
1511
1512
if command == 'init':
1513
fpr = request[1]
1514
address = request[2]
1515
1516
for c in self.clients:
1517
if c.fingerprint == fpr:
1518
client = c
1519
break
1520
else:
1521
logger.warning(u"Client not found for fingerprint: %s, ad"
1522
u"dress: %s", fpr, address)
1523
if self.use_dbus:
1524
# Emit D-Bus signal
1525
mandos_dbus_service.ClientNotFound(fpr, address[0])
1526
parent_pipe.send(False)
1527
return False
1528
1529
gobject.io_add_watch(parent_pipe.fileno(),
1530
gobject.IO_IN | gobject.IO_HUP,
1531
functools.partial(self.handle_ipc,
1532
parent_pipe = parent_pipe,
1533
client_object = client))
1534
parent_pipe.send(True)
1535
# remove the old hook in favor of the new above hook on same fileno
1536
return False
1537
if command == 'funcall':
1538
funcname = request[1]
1539
args = request[2]
1540
kwargs = request[3]
1541
1542
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1543
1544
if command == 'getattr':
1545
attrname = request[1]
1546
if callable(client_object.__getattribute__(attrname)):
1547
parent_pipe.send(('function',))
1548
else:
1549
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1550
1551
if command == 'setattr':
1552
attrname = request[1]
1553
value = request[2]
1554
setattr(client_object, attrname, value)
1555
1556
return True
547
# (self.settings
548
# ["interface"]))
549
return super(type(self), self).server_bind()
1557
550
1558
551
1559
552
def string_to_delta(interval):
1560
553
"""Parse a string and return a datetime.timedelta
1561
1562
>>> string_to_delta(u'7d')
554
555
>>> string_to_delta('7d')
1563
556
datetime.timedelta(7)
1564
>>> string_to_delta(u'60s')
557
>>> string_to_delta('60s')
1565
558
datetime.timedelta(0, 60)
1566
>>> string_to_delta(u'60m')
559
>>> string_to_delta('60m')
1567
560
datetime.timedelta(0, 3600)
1568
>>> string_to_delta(u'24h')
561
>>> string_to_delta('24h')
1569
562
datetime.timedelta(1)
1570
563
>>> string_to_delta(u'1w')
1571
564
datetime.timedelta(7)
1572
>>> string_to_delta(u'5m 30s')
1573
datetime.timedelta(0, 330)
1574
565
"""
1575
timevalue = datetime.timedelta(0)
1576
for s in interval.split():
1577
try:
1578
suffix = unicode(s[-1])
1579
value = int(s[:-1])
1580
if suffix == u"d":
1581
delta = datetime.timedelta(value)
1582
elif suffix == u"s":
1583
delta = datetime.timedelta(0, value)
1584
elif suffix == u"m":
1585
delta = datetime.timedelta(0, 0, 0, 0, value)
1586
elif suffix == u"h":
1587
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1588
elif suffix == u"w":
1589
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1590
else:
1591
raise ValueError(u"Unknown suffix %r" % suffix)
1592
except (ValueError, IndexError), e:
1593
raise ValueError(e.message)
1594
timevalue += delta
1595
return timevalue
1596
566
try:
567
suffix=unicode(interval[-1])
568
value=int(interval[:-1])
569
if suffix == u"d":
570
delta = datetime.timedelta(value)
571
elif suffix == u"s":
572
delta = datetime.timedelta(0, value)
573
elif suffix == u"m":
574
delta = datetime.timedelta(0, 0, 0, 0, value)
575
elif suffix == u"h":
576
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
577
elif suffix == u"w":
578
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
579
else:
580
raise ValueError
581
except (ValueError, IndexError):
582
raise ValueError
583
return delta
584
585
586
def server_state_changed(state):
587
"""Derived from the Avahi example code"""
588
if state == avahi.SERVER_COLLISION:
589
logger.error(u"Server name collision")
590
service.remove()
591
elif state == avahi.SERVER_RUNNING:
592
service.add()
593
594
595
def entry_group_state_changed(state, error):
596
"""Derived from the Avahi example code"""
597
logger.debug(u"state change: %i", state)
598
599
if state == avahi.ENTRY_GROUP_ESTABLISHED:
600
logger.debug(u"Service established.")
601
elif state == avahi.ENTRY_GROUP_COLLISION:
602
logger.warning(u"Service name collision.")
603
service.rename()
604
elif state == avahi.ENTRY_GROUP_FAILURE:
605
logger.critical(u"Error in group state changed %s",
606
unicode(error))
607
raise AvahiGroupError("State changed: %s", str(error))
1597
608
1598
609
def if_nametoindex(interface):
1599
"""Call the C function if_nametoindex(), or equivalent
1600
1601
Note: This function cannot accept a unicode string."""
610
"""Call the C function if_nametoindex(), or equivalent"""
1602
611
global if_nametoindex
1603
612
try:
1604
if_nametoindex = (ctypes.cdll.LoadLibrary
1605
(ctypes.util.find_library(u"c"))
1606
.if_nametoindex)
613
if "ctypes.util" not in sys.modules:
614
import ctypes.util
615
if_nametoindex = ctypes.cdll.LoadLibrary\
616
(ctypes.util.find_library("c")).if_nametoindex
1607
617
except (OSError, AttributeError):
1608
logger.warning(u"Doing if_nametoindex the hard way")
618
if "struct" not in sys.modules:
619
import struct
620
if "fcntl" not in sys.modules:
621
import fcntl
1609
622
def if_nametoindex(interface):
1610
623
"Get an interface index the hard way, i.e. using fcntl()"
1611
624
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1612
with contextlib.closing(socket.socket()) as s:
1613
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1614
struct.pack(str(u"16s16x"),
1615
interface))
1616
interface_index = struct.unpack(str(u"I"),
1617
ifreq[16:20])[0]
625
s = socket.socket()
626
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
627
struct.pack("16s16x", interface))
628
s.close()
629
interface_index = struct.unpack("I", ifreq[16:20])[0]
1618
630
return interface_index
1619
631
return if_nametoindex(interface)
1620
632
1621
633
1622
634
def daemon(nochdir = False, noclose = False):
1623
635
"""See daemon(3). Standard BSD Unix function.
1624
1625
636
This should really exist as os.daemon, but it doesn't (yet)."""
1626
637
if os.fork():
1627
638
sys.exit()
1628
639
os.setsid()
1629
640
if not nochdir:
1630
os.chdir(u"/")
641
os.chdir("/")
1631
642
if os.fork():
1632
643
sys.exit()
1633
644
if not noclose:
1635
646
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1636
647
if not stat.S_ISCHR(os.fstat(null).st_mode):
1637
648
raise OSError(errno.ENODEV,
1638
u"%s not a character device"
1639
% os.path.devnull)
649
"/dev/null not a character device")
1640
650
os.dup2(null, sys.stdin.fileno())
1641
651
os.dup2(null, sys.stdout.fileno())
1642
652
os.dup2(null, sys.stderr.fileno())
1645
655
1646
656
1647
657
def main():
1648
1649
##################################################################
1650
# Parsing of options, both command line and config file
1651
1652
parser = optparse.OptionParser(version = "%%prog %s" % version)
1653
parser.add_option("-i", u"--interface", type=u"string",
1654
metavar="IF", help=u"Bind to interface IF")
1655
parser.add_option("-a", u"--address", type=u"string",
1656
help=u"Address to listen for requests on")
1657
parser.add_option("-p", u"--port", type=u"int",
1658
help=u"Port number to receive requests on")
1659
parser.add_option("--check", action=u"store_true",
1660
help=u"Run self-test")
1661
parser.add_option("--debug", action=u"store_true",
1662
help=u"Debug mode; run in foreground and log to"
1663
u" terminal")
1664
parser.add_option("--debuglevel", type=u"string", metavar="Level",
1665
help=u"Debug level for stdout output")
1666
parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1667
u" priority string (see GnuTLS documentation)")
1668
parser.add_option("--servicename", type=u"string",
1669
metavar=u"NAME", help=u"Zeroconf service name")
1670
parser.add_option("--configdir", type=u"string",
1671
default=u"/etc/mandos", metavar=u"DIR",
1672
help=u"Directory to search for configuration"
1673
u" files")
1674
parser.add_option("--no-dbus", action=u"store_false",
1675
dest=u"use_dbus", help=u"Do not provide D-Bus"
1676
u" system bus interface")
1677
parser.add_option("--no-ipv6", action=u"store_false",
1678
dest=u"use_ipv6", help=u"Do not use IPv6")
1679
options = parser.parse_args()[0]
658
global main_loop_started
659
main_loop_started = False
660
661
parser = OptionParser(version = "%%prog %s" % version)
662
parser.add_option("-i", "--interface", type="string",
663
metavar="IF", help="Bind to interface IF")
664
parser.add_option("-a", "--address", type="string",
665
help="Address to listen for requests on")
666
parser.add_option("-p", "--port", type="int",
667
help="Port number to receive requests on")
668
parser.add_option("--check", action="store_true", default=False,
669
help="Run self-test")
670
parser.add_option("--debug", action="store_true",
671
help="Debug mode; run in foreground and log to"
672
" terminal")
673
parser.add_option("--priority", type="string", help="GnuTLS"
674
" priority string (see GnuTLS documentation)")
675
parser.add_option("--servicename", type="string", metavar="NAME",
676
help="Zeroconf service name")
677
parser.add_option("--configdir", type="string",
678
default="/etc/mandos", metavar="DIR",
679
help="Directory to search for configuration"
680
" files")
681
(options, args) = parser.parse_args()
1680
682
1681
683
if options.check:
1682
684
import doctest
1684
686
sys.exit()
1685
687
1686
688
# Default values for config file for server-global settings
1687
server_defaults = { u"interface": u"",
1688
u"address": u"",
1689
u"port": u"",
1690
u"debug": u"False",
1691
u"priority":
1692
u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1693
u"servicename": u"Mandos",
1694
u"use_dbus": u"True",
1695
u"use_ipv6": u"True",
1696
u"debuglevel": u"",
689
server_defaults = { "interface": "",
690
"address": "",
691
"port": "",
692
"debug": "False",
693
"priority":
694
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
695
"servicename": "Mandos",
1697
696
}
1698
697
1699
698
# Parse config file for server-global settings
1700
server_config = configparser.SafeConfigParser(server_defaults)
699
server_config = ConfigParser.SafeConfigParser(server_defaults)
1701
700
del server_defaults
1702
server_config.read(os.path.join(options.configdir,
1703
u"mandos.conf"))
701
server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
server_section = "server"
1704
703
# Convert the SafeConfigParser object to a dict
1705
server_settings = server_config.defaults()
1706
# Use the appropriate methods on the non-string config options
1707
for option in (u"debug", u"use_dbus", u"use_ipv6"):
1708
server_settings[option] = server_config.getboolean(u"DEFAULT",
1709
option)
1710
if server_settings["port"]:
1711
server_settings["port"] = server_config.getint(u"DEFAULT",
1712
u"port")
704
server_settings = dict(server_config.items(server_section))
705
# Use getboolean on the boolean config option
706
server_settings["debug"] = server_config.getboolean\
707
(server_section, "debug")
1713
708
del server_config
1714
709
1715
710
# Override the settings from the config file with command line
1716
711
# options, if set.
1717
for option in (u"interface", u"address", u"port", u"debug",
1718
u"priority", u"servicename", u"configdir",
1719
u"use_dbus", u"use_ipv6", u"debuglevel"):
712
for option in ("interface", "address", "port", "debug",
713
"priority", "servicename", "configdir"):
1720
714
value = getattr(options, option)
1721
715
if value is not None:
1722
716
server_settings[option] = value
1723
717
del options
1724
# Force all strings to be unicode
1725
for option in server_settings.keys():
1726
if type(server_settings[option]) is str:
1727
server_settings[option] = unicode(server_settings[option])
1728
718
# Now we have our good server settings in "server_settings"
1729
719
1730
##################################################################
1731
1732
# For convenience
1733
debug = server_settings[u"debug"]
1734
debuglevel = server_settings[u"debuglevel"]
1735
use_dbus = server_settings[u"use_dbus"]
1736
use_ipv6 = server_settings[u"use_ipv6"]
1737
1738
if server_settings[u"servicename"] != u"Mandos":
1739
syslogger.setFormatter(logging.Formatter
1740
(u'Mandos (%s) [%%(process)d]:'
1741
u' %%(levelname)s: %%(message)s'
1742
% server_settings[u"servicename"]))
1743
1744
# Parse config file with clients
1745
client_defaults = { u"timeout": u"1h",
1746
u"interval": u"5m",
1747
u"checker": u"fping -q -- %%(host)s",
1748
u"host": u"",
1749
u"approval_delay": u"0s",
1750
u"approval_duration": u"1s",
1751
}
1752
client_config = configparser.SafeConfigParser(client_defaults)
1753
client_config.read(os.path.join(server_settings[u"configdir"],
1754
u"clients.conf"))
1755
1756
global mandos_dbus_service
1757
mandos_dbus_service = None
1758
1759
tcp_server = MandosServer((server_settings[u"address"],
1760
server_settings[u"port"]),
1761
ClientHandler,
1762
interface=(server_settings[u"interface"]
1763
or None),
1764
use_ipv6=use_ipv6,
1765
gnutls_priority=
1766
server_settings[u"priority"],
1767
use_dbus=use_dbus)
720
debug = server_settings["debug"]
721
1768
722
if not debug:
1769
pidfilename = u"/var/run/mandos.pid"
1770
try:
1771
pidfile = open(pidfilename, u"w")
1772
except IOError:
1773
logger.error(u"Could not open file %r", pidfilename)
1774
1775
try:
1776
uid = pwd.getpwnam(u"_mandos").pw_uid
1777
gid = pwd.getpwnam(u"_mandos").pw_gid
1778
except KeyError:
1779
try:
1780
uid = pwd.getpwnam(u"mandos").pw_uid
1781
gid = pwd.getpwnam(u"mandos").pw_gid
1782
except KeyError:
1783
try:
1784
uid = pwd.getpwnam(u"nobody").pw_uid
1785
gid = pwd.getpwnam(u"nobody").pw_gid
1786
except KeyError:
1787
uid = 65534
1788
gid = 65534
1789
try:
1790
os.setgid(gid)
1791
os.setuid(uid)
1792
except OSError, error:
1793
if error[0] != errno.EPERM:
1794
raise error
1795
1796
if not debug and not debuglevel:
1797
723
syslogger.setLevel(logging.WARNING)
1798
724
console.setLevel(logging.WARNING)
1799
if debuglevel:
1800
level = getattr(logging, debuglevel.upper())
1801
syslogger.setLevel(level)
1802
console.setLevel(level)
1803
1804
if debug:
1805
# Enable all possible GnuTLS debugging
1806
1807
# "Use a log level over 10 to enable all debugging options."
1808
# - GnuTLS manual
1809
gnutls.library.functions.gnutls_global_set_log_level(11)
1810
1811
@gnutls.library.types.gnutls_log_func
1812
def debug_gnutls(level, string):
1813
logger.debug(u"GnuTLS: %s", string[:-1])
1814
1815
(gnutls.library.functions
1816
.gnutls_global_set_log_function(debug_gnutls))
1817
1818
# Redirect stdin so all checkers get /dev/null
1819
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1820
os.dup2(null, sys.stdin.fileno())
1821
if null > 2:
1822
os.close(null)
1823
else:
1824
# No console logging
1825
logger.removeHandler(console)
1826
725
726
if server_settings["servicename"] != "Mandos":
727
syslogger.setFormatter(logging.Formatter\
728
('Mandos (%s): %%(levelname)s:'
729
' %%(message)s'
730
% server_settings["servicename"]))
731
732
# Parse config file with clients
733
client_defaults = { "timeout": "1h",
734
"interval": "5m",
735
"checker": "fping -q -- %%(host)s",
736
}
737
client_config = ConfigParser.SafeConfigParser(client_defaults)
738
client_config.read(os.path.join(server_settings["configdir"],
739
"clients.conf"))
740
741
global service
742
service = AvahiService(name = server_settings["servicename"],
743
type = "_mandos._tcp", );
744
if server_settings["interface"]:
745
service.interface = if_nametoindex(server_settings["interface"])
1827
746
1828
747
global main_loop
748
global bus
749
global server
1829
750
# From the Avahi example code
1830
751
DBusGMainLoop(set_as_default=True )
1831
752
main_loop = gobject.MainLoop()
1832
753
bus = dbus.SystemBus()
754
server = dbus.Interface(
755
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
avahi.DBUS_INTERFACE_SERVER )
1833
757
# End of Avahi example code
1834
if use_dbus:
1835
try:
1836
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
1837
bus, do_not_queue=True)
1838
except dbus.exceptions.NameExistsException, e:
1839
logger.error(unicode(e) + u", disabling D-Bus")
1840
use_dbus = False
1841
server_settings[u"use_dbus"] = False
1842
tcp_server.use_dbus = False
1843
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1844
service = AvahiService(name = server_settings[u"servicename"],
1845
servicetype = u"_mandos._tcp",
1846
protocol = protocol, bus = bus)
1847
if server_settings["interface"]:
1848
service.interface = (if_nametoindex
1849
(str(server_settings[u"interface"])))
1850
758
759
clients = Set()
760
def remove_from_clients(client):
761
clients.remove(client)
762
if not clients:
763
logger.critical(u"No clients left, exiting")
764
sys.exit()
765
766
clients.update(Set(Client(name = section,
767
stop_hook = remove_from_clients,
768
config
769
= dict(client_config.items(section)))
770
for section in client_config.sections()))
771
if not clients:
772
logger.critical(u"No clients defined")
773
sys.exit(1)
774
1851
775
if not debug:
1852
# Close all input and output, do double fork, etc.
776
logger.removeHandler(console)
1853
777
daemon()
1854
1855
global multiprocessing_manager
1856
multiprocessing_manager = multiprocessing.Manager()
1857
1858
client_class = Client
1859
if use_dbus:
1860
client_class = functools.partial(ClientDBus, bus = bus)
1861
def client_config_items(config, section):
1862
special_settings = {
1863
"approved_by_default":
1864
lambda: config.getboolean(section,
1865
"approved_by_default"),
1866
}
1867
for name, value in config.items(section):
1868
try:
1869
yield (name, special_settings[name]())
1870
except KeyError:
1871
yield (name, value)
1872
1873
tcp_server.clients.update(set(
1874
client_class(name = section,
1875
config= dict(client_config_items(
1876
client_config, section)))
1877
for section in client_config.sections()))
1878
if not tcp_server.clients:
1879
logger.warning(u"No clients defined")
1880
778
779
pidfilename = "/var/run/mandos/mandos.pid"
780
pid = os.getpid()
781
try:
782
pidfile = open(pidfilename, "w")
783
pidfile.write(str(pid) + "\n")
784
pidfile.close()
785
del pidfile
786
except IOError, err:
787
logger.error(u"Could not write %s file with PID %d",
788
pidfilename, os.getpid())
789
790
def cleanup():
791
"Cleanup function; run on exit"
792
global group
793
# From the Avahi example code
794
if not group is None:
795
group.Free()
796
group = None
797
# End of Avahi example code
798
799
while clients:
800
client = clients.pop()
801
client.stop_hook = None
802
client.stop()
803
804
atexit.register(cleanup)
805
1881
806
if not debug:
1882
try:
1883
with pidfile:
1884
pid = os.getpid()
1885
pidfile.write(str(pid) + "\n")
1886
del pidfile
1887
except IOError:
1888
logger.error(u"Could not write to file %r with PID %d",
1889
pidfilename, pid)
1890
except NameError:
1891
# "pidfile" was never created
1892
pass
1893
del pidfilename
1894
1895
807
signal.signal(signal.SIGINT, signal.SIG_IGN)
1896
1897
808
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1898
809
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1899
810
1900
if use_dbus:
1901
class MandosDBusService(dbus.service.Object):
1902
"""A D-Bus proxy object"""
1903
def __init__(self):
1904
dbus.service.Object.__init__(self, bus, u"/")
1905
_interface = u"se.bsnet.fukt.Mandos"
1906
1907
@dbus.service.signal(_interface, signature=u"o")
1908
def ClientAdded(self, objpath):
1909
"D-Bus signal"
1910
pass
1911
1912
@dbus.service.signal(_interface, signature=u"ss")
1913
def ClientNotFound(self, fingerprint, address):
1914
"D-Bus signal"
1915
pass
1916
1917
@dbus.service.signal(_interface, signature=u"os")
1918
def ClientRemoved(self, objpath, name):
1919
"D-Bus signal"
1920
pass
1921
1922
@dbus.service.method(_interface, out_signature=u"ao")
1923
def GetAllClients(self):
1924
"D-Bus method"
1925
return dbus.Array(c.dbus_object_path
1926
for c in tcp_server.clients)
1927
1928
@dbus.service.method(_interface,
1929
out_signature=u"a{oa{sv}}")
1930
def GetAllClientsWithProperties(self):
1931
"D-Bus method"
1932
return dbus.Dictionary(
1933
((c.dbus_object_path, c.GetAll(u""))
1934
for c in tcp_server.clients),
1935
signature=u"oa{sv}")
1936
1937
@dbus.service.method(_interface, in_signature=u"o")
1938
def RemoveClient(self, object_path):
1939
"D-Bus method"
1940
for c in tcp_server.clients:
1941
if c.dbus_object_path == object_path:
1942
tcp_server.clients.remove(c)
1943
c.remove_from_connection()
1944
# Don't signal anything except ClientRemoved
1945
c.disable(quiet=True)
1946
# Emit D-Bus signal
1947
self.ClientRemoved(object_path, c.name)
1948
return
1949
raise KeyError(object_path)
1950
1951
del _interface
1952
1953
mandos_dbus_service = MandosDBusService()
1954
1955
def cleanup():
1956
"Cleanup function; run on exit"
1957
service.cleanup()
1958
1959
while tcp_server.clients:
1960
client = tcp_server.clients.pop()
1961
if use_dbus:
1962
client.remove_from_connection()
1963
client.disable_hook = None
1964
# Don't signal anything except ClientRemoved
1965
client.disable(quiet=True)
1966
if use_dbus:
1967
# Emit D-Bus signal
1968
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1969
client.name)
1970
1971
atexit.register(cleanup)
1972
1973
for client in tcp_server.clients:
1974
if use_dbus:
1975
# Emit D-Bus signal
1976
mandos_dbus_service.ClientAdded(client.dbus_object_path)
1977
client.enable()
1978
1979
tcp_server.enable()
1980
tcp_server.server_activate()
1981
811
for client in clients:
812
client.start()
813
814
tcp_server = IPv6_TCPServer((server_settings["address"],
815
server_settings["port"]),
816
tcp_handler,
817
settings=server_settings,
818
clients=clients)
1982
819
# Find out what port we got
1983
820
service.port = tcp_server.socket.getsockname()[1]
1984
if use_ipv6:
1985
logger.info(u"Now listening on address %r, port %d,"
1986
" flowinfo %d, scope_id %d"
1987
% tcp_server.socket.getsockname())
1988
else: # IPv4
1989
logger.info(u"Now listening on address %r, port %d"
1990
% tcp_server.socket.getsockname())
821
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
u" scope_id %d" % tcp_server.socket.getsockname())
1991
823
1992
824
#service.interface = tcp_server.socket.getsockname()[3]
1993
825
1994
826
try:
1995
827
# From the Avahi example code
828
server.connect_to_signal("StateChanged", server_state_changed)
1996
829
try:
1997
service.activate()
830
server_state_changed(server.GetState())
1998
831
except dbus.exceptions.DBusException, error:
1999
832
logger.critical(u"DBusException: %s", error)
2000
cleanup()
2001
833
sys.exit(1)
2002
834
# End of Avahi example code
2003
835
2004
836
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2005
837
lambda *args, **kwargs:
2006
(tcp_server.handle_request
2007
(*args[2:], **kwargs) or True))
838
tcp_server.handle_request\
839
(*args[2:], **kwargs) or True)
2008
840
2009
841
logger.debug(u"Starting main loop")
842
main_loop_started = True
2010
843
main_loop.run()
2011
844
except AvahiError, error:
2012
logger.critical(u"AvahiError: %s", error)
2013
cleanup()
845
logger.critical(u"AvahiError: %s" + unicode(error))
2014
846
sys.exit(1)
2015
847
except KeyboardInterrupt:
2016
848
if debug:
2017
print >> sys.stderr
2018
logger.debug(u"Server received KeyboardInterrupt")
2019
logger.debug(u"Server exiting")
2020
# Must run before the D-Bus bus name gets deregistered
2021
cleanup()
849
print
2022
850
2023
851
if __name__ == '__main__':
2024
852
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0