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- Committer: Teddy Hogeborn
- Date: 2008-08-18 03:50:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20080818035028-su31apqs2pv2147v
* mandos-keygen.xml: Removed <?xml-stylesheet>. New entity
"&OVERVIEW;" referring to "overview.xml".
(PURPOSE, OVERVIEW): New sections, same as in mandos(8).
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
* mandos.xml (OPTIONS, CLIENTS): Slight wording change.
"&OVERVIEW;" referring to "overview.xml".
(PURPOSE, OVERVIEW): New sections, same as in mandos(8).
(EXAMPLES): Renamed to "EXAMPLE", as per man-pages(7).
* mandos.xml (OPTIONS, CLIENTS): Slight wording change.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- 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
#
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
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
122
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
123
def rename(self):
154
124
"""Derived from the Avahi example code"""
155
125
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))
126
logger.critical(u"No suitable service name found after %i"
127
u" retries, exiting.", rename_count)
128
raise AvahiServiceError("Too many renames")
129
self.name = server.GetAlternativeServiceName(self.name)
130
logger.info(u"Changing name to %r ...", str(self.name))
131
syslogger.setFormatter(logging.Formatter\
132
('Mandos (%s): %%(levelname)s:'
133
' %%(message)s' % self.name))
167
134
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)
135
self.add()
174
136
self.rename_count += 1
175
137
def remove(self):
176
138
"""Derived from the Avahi example code"""
177
if self.group is not None:
178
self.group.Reset()
139
if group is not None:
140
group.Reset()
179
141
def add(self):
180
142
"""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())
143
global group
144
if group is None:
145
group = dbus.Interface\
146
(bus.get_object(avahi.DBUS_NAME,
147
server.EntryGroupNew()),
148
avahi.DBUS_INTERFACE_ENTRY_GROUP)
149
group.connect_to_signal('StateChanged',
150
entry_group_state_changed)
151
logger.debug(u"Adding service '%s' of type '%s' ...",
152
service.name, service.type)
153
group.AddService(
154
self.interface, # interface
155
avahi.PROTO_INET6, # protocol
156
dbus.UInt32(0), # flags
157
self.name, self.type,
158
self.domain, self.host,
159
dbus.UInt16(self.port),
160
avahi.string_array_to_txt_array(self.TXT))
161
group.Commit()
162
163
# From the Avahi example code:
164
group = None # our entry group
165
# End of Avahi example code
237
166
238
167
239
168
class Client(object):
240
169
"""A representation of a client host served by this server.
241
242
170
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.
171
name: string; from the config file, used in log messages
172
fingerprint: string (40 or 32 hexadecimal digits); used to
173
uniquely identify the client
174
secret: bytestring; sent verbatim (over TLS) to client
175
host: string; available for use by the checker command
176
created: datetime.datetime(); object creation, not client host
177
last_checked_ok: datetime.datetime() or None if not yet checked OK
178
timeout: datetime.timedelta(); How long from last_checked_ok
179
until this client is invalid
180
interval: datetime.timedelta(); How often to start a new checker
181
stop_hook: If set, called by stop() as stop_hook(self)
182
checker: subprocess.Popen(); a running checker process used
183
to see if the client lives.
184
'None' if no process is running.
185
checker_initiator_tag: a gobject event source tag, or None
186
stop_initiator_tag: - '' -
249
187
checker_callback_tag: - '' -
250
checker_command: string; External command which is run to check
251
if client lives. %() expansions are done at
188
checker_command: string; External command which is run to check if
189
client lives. %() expansions are done at
252
190
runtime with vars(self) as dict, so that for
253
191
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.
192
Private attibutes:
193
_timeout: Real variable for 'timeout'
194
_interval: Real variable for 'interval'
195
_timeout_milliseconds: Used when calling gobject.timeout_add()
196
_interval_milliseconds: - '' -
272
197
"""
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):
198
def _set_timeout(self, timeout):
199
"Setter function for 'timeout' attribute"
200
self._timeout = timeout
201
self._timeout_milliseconds = ((self.timeout.days
202
* 24 * 60 * 60 * 1000)
203
+ (self.timeout.seconds * 1000)
204
+ (self.timeout.microseconds
205
// 1000))
206
timeout = property(lambda self: self._timeout,
207
_set_timeout)
208
del _set_timeout
209
def _set_interval(self, interval):
210
"Setter function for 'interval' attribute"
211
self._interval = interval
212
self._interval_milliseconds = ((self.interval.days
213
* 24 * 60 * 60 * 1000)
214
+ (self.interval.seconds
215
* 1000)
216
+ (self.interval.microseconds
217
// 1000))
218
interval = property(lambda self: self._interval,
219
_set_interval)
220
del _set_interval
221
def __init__(self, name = None, stop_hook=None, config={}):
298
222
"""Note: the 'checker' key in 'config' sets the
299
223
'checker_command' attribute and *not* the 'checker'
300
224
attribute."""
301
225
self.name = name
302
if config is None:
303
config = {}
304
226
logger.debug(u"Creating client %r", self.name)
305
227
# Uppercase and remove spaces from fingerprint for later
306
228
# comparison purposes with return value from the fingerprint()
307
229
# function
308
self.fingerprint = (config[u"fingerprint"].upper()
309
.replace(u" ", u""))
230
self.fingerprint = config["fingerprint"].upper()\
231
.replace(u" ", u"")
310
232
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()
233
if "secret" in config:
234
self.secret = config["secret"].decode(u"base64")
235
elif "secfile" in config:
236
sf = open(config["secfile"])
237
self.secret = sf.read()
238
sf.close()
318
239
else:
319
240
raise TypeError(u"No secret or secfile for client %s"
320
241
% 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
242
self.host = config.get("host", "")
243
self.created = datetime.datetime.now()
325
244
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
245
self.timeout = string_to_delta(config["timeout"])
246
self.interval = string_to_delta(config["interval"])
247
self.stop_hook = stop_hook
329
248
self.checker = None
330
249
self.checker_initiator_tag = None
331
self.disable_initiator_tag = None
250
self.stop_initiator_tag = None
332
251
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):
252
self.check_command = config["checker"]
253
def start(self):
352
254
"""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
255
# Schedule a new checker to be started an 'interval' from now,
359
256
# 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
257
self.checker_initiator_tag = gobject.timeout_add\
258
(self._interval_milliseconds,
259
self.start_checker)
368
260
# Also start a new checker *right now*.
369
261
self.start_checker()
370
371
def disable(self, quiet=True):
372
"""Disable this client."""
373
if not getattr(self, "enabled", False):
262
# Schedule a stop() when 'timeout' has passed
263
self.stop_initiator_tag = gobject.timeout_add\
264
(self._timeout_milliseconds,
265
self.stop)
266
def stop(self):
267
"""Stop this client.
268
The possibility that a client might be restarted is left open,
269
but not currently used."""
270
# If this client doesn't have a secret, it is already stopped.
271
if hasattr(self, "secret") and self.secret:
272
logger.info(u"Stopping client %s", self.name)
273
self.secret = None
274
else:
374
275
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):
276
if getattr(self, "stop_initiator_tag", False):
277
gobject.source_remove(self.stop_initiator_tag)
278
self.stop_initiator_tag = None
279
if getattr(self, "checker_initiator_tag", False):
383
280
gobject.source_remove(self.checker_initiator_tag)
384
281
self.checker_initiator_tag = None
385
282
self.stop_checker()
386
if self.disable_hook:
387
self.disable_hook(self)
388
self.enabled = False
283
if self.stop_hook:
284
self.stop_hook(self)
389
285
# Do not run this again if called by a gobject.timeout_add
390
286
return False
391
392
287
def __del__(self):
393
self.disable_hook = None
394
self.disable()
395
396
def checker_callback(self, pid, condition, command):
288
self.stop_hook = None
289
self.stop()
290
def checker_callback(self, pid, condition):
397
291
"""The checker has completed, so take appropriate actions."""
292
now = datetime.datetime.now()
398
293
self.checker_callback_tag = None
399
294
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:
295
if os.WIFEXITED(condition) \
296
and (os.WEXITSTATUS(condition) == 0):
297
logger.info(u"Checker for %(name)s succeeded",
298
vars(self))
299
self.last_checked_ok = now
300
gobject.source_remove(self.stop_initiator_tag)
301
self.stop_initiator_tag = gobject.timeout_add\
302
(self._timeout_milliseconds,
303
self.stop)
304
elif not os.WIFEXITED(condition):
410
305
logger.warning(u"Checker for %(name)s crashed?",
411
306
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
307
else:
308
logger.info(u"Checker for %(name)s failed",
309
vars(self))
425
310
def start_checker(self):
426
311
"""Start a new checker subprocess if one is not running.
427
428
312
If a checker already exists, leave it running and do
429
313
nothing."""
430
314
# The reason for not killing a running checker is that if we
433
317
# client would inevitably timeout, since no checker would get
434
318
# a chance to run to completion. If we instead leave running
435
319
# 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
320
# than 'timeout' for the client to be declared invalid, which
321
# is as it should be.
453
322
if self.checker is None:
454
323
try:
455
# In case checker_command has exactly one % operator
456
command = self.checker_command % self.host
324
# In case check_command has exactly one % operator
325
command = self.check_command % self.host
457
326
except TypeError:
458
327
# 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
328
escaped_attrs = dict((key, re.escape(str(val)))
329
for key, val in
330
vars(self).iteritems())
467
331
try:
468
command = self.checker_command % escaped_attrs
332
command = self.check_command % escaped_attrs
469
333
except TypeError, error:
470
334
logger.error(u'Could not format string "%s":'
471
u' %s', self.checker_command, error)
335
u' %s', self.check_command, error)
472
336
return True # Try again later
473
self.current_checker_command = command
474
337
try:
475
338
logger.info(u"Starting checker %r for %s",
476
339
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
340
self.checker = subprocess.Popen(command,
482
341
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:
342
shell=True, cwd="/")
343
self.checker_callback_tag = gobject.child_watch_add\
344
(self.checker.pid,
345
self.checker_callback)
346
except subprocess.OSError, error:
495
347
logger.error(u"Failed to start subprocess: %s",
496
348
error)
497
349
# Re-run this periodically if run by gobject.timeout_add
498
350
return True
499
500
351
def stop_checker(self):
501
352
"""Force the checker process, if any, to stop."""
502
353
if self.checker_callback_tag:
503
354
gobject.source_remove(self.checker_callback_tag)
504
355
self.checker_callback_tag = None
505
if getattr(self, u"checker", None) is None:
356
if getattr(self, "checker", None) is None:
506
357
return
507
358
logger.debug(u"Stopping checker for %(name)s", vars(self))
508
359
try:
509
360
os.kill(self.checker.pid, signal.SIGTERM)
510
#time.sleep(0.5)
361
#os.sleep(0.5)
511
362
#if self.checker.poll() is None:
512
363
# os.kill(self.checker.pid, signal.SIGKILL)
513
364
except OSError, error:
514
365
if error.errno != errno.ESRCH: # No such process
515
366
raise
516
367
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
368
def still_valid(self):
369
"""Has the timeout not yet passed for this client?"""
370
now = datetime.datetime.now()
1027
371
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.
372
return now < (self.created + self.timeout)
373
else:
374
return now < (self.last_checked_ok + self.timeout)
375
376
377
def peer_certificate(session):
378
"Return the peer's OpenPGP certificate as a bytestring"
379
# If not an OpenPGP certificate...
380
if gnutls.library.functions.gnutls_certificate_type_get\
381
(session._c_object) \
382
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
383
# ...do the normal thing
384
return session.peer_certificate
385
list_size = ctypes.c_uint()
386
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
387
(session._c_object, ctypes.byref(list_size))
388
if list_size.value == 0:
389
return None
390
cert = cert_list[0]
391
return ctypes.string_at(cert.data, cert.size)
392
393
394
def fingerprint(openpgp):
395
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
396
# New GnuTLS "datum" with the OpenPGP public key
397
datum = gnutls.library.types.gnutls_datum_t\
398
(ctypes.cast(ctypes.c_char_p(openpgp),
399
ctypes.POINTER(ctypes.c_ubyte)),
400
ctypes.c_uint(len(openpgp)))
401
# New empty GnuTLS certificate
402
crt = gnutls.library.types.gnutls_openpgp_crt_t()
403
gnutls.library.functions.gnutls_openpgp_crt_init\
404
(ctypes.byref(crt))
405
# Import the OpenPGP public key into the certificate
406
gnutls.library.functions.gnutls_openpgp_crt_import\
407
(crt, ctypes.byref(datum),
408
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
409
# New buffer for the fingerprint
410
buffer = ctypes.create_string_buffer(20)
411
buffer_length = ctypes.c_size_t()
412
# Get the fingerprint from the certificate into the buffer
413
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
414
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
415
# Deinit the certificate
416
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
417
# Convert the buffer to a Python bytestring
418
fpr = ctypes.string_at(buffer, buffer_length.value)
419
# Convert the bytestring to hexadecimal notation
420
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
421
return hex_fpr
422
423
424
class tcp_handler(SocketServer.BaseRequestHandler, object):
425
"""A TCP request handler class.
426
Instantiated by IPv6_TCPServer for each request to handle it.
1145
427
Note: This will run in its own forked process."""
1146
428
1147
429
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
430
logger.info(u"TCP connection from: %s",
431
unicode(self.client_address))
432
session = gnutls.connection.ClientSession\
433
(self.request, gnutls.connection.X509Credentials())
434
435
line = self.request.makefile().readline()
436
logger.debug(u"Protocol version: %r", line)
437
try:
438
if int(line.strip().split()[0]) > 1:
439
raise RuntimeError
440
except (ValueError, IndexError, RuntimeError), error:
441
logger.error(u"Unknown protocol version: %s", error)
442
return
443
444
# Note: gnutls.connection.X509Credentials is really a generic
445
# GnuTLS certificate credentials object so long as no X.509
446
# keys are added to it. Therefore, we can use it here despite
447
# using OpenPGP certificates.
448
449
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
450
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
451
# "+DHE-DSS"))
452
priority = "NORMAL" # Fallback default, since this
453
# MUST be set.
454
if self.server.settings["priority"]:
455
priority = self.server.settings["priority"]
456
gnutls.library.functions.gnutls_priority_set_direct\
457
(session._c_object, priority, None);
458
459
try:
460
session.handshake()
461
except gnutls.errors.GNUTLSError, error:
462
logger.warning(u"Handshake failed: %s", error)
463
# Do not run session.bye() here: the session is not
464
# established. Just abandon the request.
465
return
466
try:
467
fpr = fingerprint(peer_certificate(session))
468
except (TypeError, gnutls.errors.GNUTLSError), error:
469
logger.warning(u"Bad certificate: %s", error)
470
session.bye()
471
return
472
logger.debug(u"Fingerprint: %s", fpr)
473
client = None
474
for c in self.server.clients:
475
if c.fingerprint == fpr:
476
client = c
477
break
478
if not client:
479
logger.warning(u"Client not found for fingerprint: %s",
480
fpr)
481
session.bye()
482
return
483
# Have to check if client.still_valid(), since it is possible
484
# that the client timed out while establishing the GnuTLS
485
# session.
486
if not client.still_valid():
487
logger.warning(u"Client %(name)s is invalid",
488
vars(client))
489
session.bye()
490
return
491
sent_size = 0
492
while sent_size < len(client.secret):
493
sent = session.send(client.secret[sent_size:])
494
logger.debug(u"Sent: %d, remaining: %d",
495
sent, len(client.secret)
496
- (sent_size + sent))
497
sent_size += sent
498
session.bye()
499
500
501
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
502
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1394
503
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
504
settings: Server settings
505
clients: Set() of Client objects
1398
506
"""
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)
507
address_family = socket.AF_INET6
508
def __init__(self, *args, **kwargs):
509
if "settings" in kwargs:
510
self.settings = kwargs["settings"]
511
del kwargs["settings"]
512
if "clients" in kwargs:
513
self.clients = kwargs["clients"]
514
del kwargs["clients"]
515
return super(type(self), self).__init__(*args, **kwargs)
1406
516
def server_bind(self):
1407
517
"""This overrides the normal server_bind() function
1408
518
to bind to an interface if one was specified, and also NOT to
1409
519
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
520
if self.settings["interface"]:
521
# 25 is from /usr/include/asm-i486/socket.h
522
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
523
try:
524
self.socket.setsockopt(socket.SOL_SOCKET,
525
SO_BINDTODEVICE,
526
self.settings["interface"])
527
except socket.error, error:
528
if error[0] == errno.EPERM:
529
logger.error(u"No permission to"
530
u" bind to interface %s",
531
self.settings["interface"])
532
else:
533
raise error
1432
534
# Only bind(2) the socket if we really need to.
1433
535
if self.server_address[0] or self.server_address[1]:
1434
536
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,
537
in6addr_any = "::"
538
self.server_address = (in6addr_any,
1440
539
self.server_address[1])
1441
540
elif not self.server_address[1]:
1442
541
self.server_address = (self.server_address[0],
1443
542
0)
1444
# if self.interface:
543
# if self.settings["interface"]:
1445
544
# self.server_address = (self.server_address[0],
1446
545
# 0, # port
1447
546
# 0, # flowinfo
1448
547
# 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
548
# (self.settings
549
# ["interface"]))
550
return super(type(self), self).server_bind()
1557
551
1558
552
1559
553
def string_to_delta(interval):
1560
554
"""Parse a string and return a datetime.timedelta
1561
1562
>>> string_to_delta(u'7d')
555
556
>>> string_to_delta('7d')
1563
557
datetime.timedelta(7)
1564
>>> string_to_delta(u'60s')
558
>>> string_to_delta('60s')
1565
559
datetime.timedelta(0, 60)
1566
>>> string_to_delta(u'60m')
560
>>> string_to_delta('60m')
1567
561
datetime.timedelta(0, 3600)
1568
>>> string_to_delta(u'24h')
562
>>> string_to_delta('24h')
1569
563
datetime.timedelta(1)
1570
564
>>> string_to_delta(u'1w')
1571
565
datetime.timedelta(7)
1572
>>> string_to_delta(u'5m 30s')
1573
datetime.timedelta(0, 330)
1574
566
"""
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
567
try:
568
suffix=unicode(interval[-1])
569
value=int(interval[:-1])
570
if suffix == u"d":
571
delta = datetime.timedelta(value)
572
elif suffix == u"s":
573
delta = datetime.timedelta(0, value)
574
elif suffix == u"m":
575
delta = datetime.timedelta(0, 0, 0, 0, value)
576
elif suffix == u"h":
577
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
578
elif suffix == u"w":
579
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
580
else:
581
raise ValueError
582
except (ValueError, IndexError):
583
raise ValueError
584
return delta
585
586
587
def server_state_changed(state):
588
"""Derived from the Avahi example code"""
589
if state == avahi.SERVER_COLLISION:
590
logger.error(u"Server name collision")
591
service.remove()
592
elif state == avahi.SERVER_RUNNING:
593
service.add()
594
595
596
def entry_group_state_changed(state, error):
597
"""Derived from the Avahi example code"""
598
logger.debug(u"state change: %i", state)
599
600
if state == avahi.ENTRY_GROUP_ESTABLISHED:
601
logger.debug(u"Service established.")
602
elif state == avahi.ENTRY_GROUP_COLLISION:
603
logger.warning(u"Service name collision.")
604
service.rename()
605
elif state == avahi.ENTRY_GROUP_FAILURE:
606
logger.critical(u"Error in group state changed %s",
607
unicode(error))
608
raise AvahiGroupError("State changed: %s", str(error))
1597
609
1598
610
def if_nametoindex(interface):
1599
"""Call the C function if_nametoindex(), or equivalent
1600
1601
Note: This function cannot accept a unicode string."""
611
"""Call the C function if_nametoindex(), or equivalent"""
1602
612
global if_nametoindex
1603
613
try:
1604
if_nametoindex = (ctypes.cdll.LoadLibrary
1605
(ctypes.util.find_library(u"c"))
1606
.if_nametoindex)
614
if "ctypes.util" not in sys.modules:
615
import ctypes.util
616
if_nametoindex = ctypes.cdll.LoadLibrary\
617
(ctypes.util.find_library("c")).if_nametoindex
1607
618
except (OSError, AttributeError):
1608
logger.warning(u"Doing if_nametoindex the hard way")
619
if "struct" not in sys.modules:
620
import struct
621
if "fcntl" not in sys.modules:
622
import fcntl
1609
623
def if_nametoindex(interface):
1610
624
"Get an interface index the hard way, i.e. using fcntl()"
1611
625
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]
626
s = socket.socket()
627
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
628
struct.pack("16s16x", interface))
629
s.close()
630
interface_index = struct.unpack("I", ifreq[16:20])[0]
1618
631
return interface_index
1619
632
return if_nametoindex(interface)
1620
633
1621
634
1622
635
def daemon(nochdir = False, noclose = False):
1623
636
"""See daemon(3). Standard BSD Unix function.
1624
1625
637
This should really exist as os.daemon, but it doesn't (yet)."""
1626
638
if os.fork():
1627
639
sys.exit()
1628
640
os.setsid()
1629
641
if not nochdir:
1630
os.chdir(u"/")
642
os.chdir("/")
1631
643
if os.fork():
1632
644
sys.exit()
1633
645
if not noclose:
1635
647
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1636
648
if not stat.S_ISCHR(os.fstat(null).st_mode):
1637
649
raise OSError(errno.ENODEV,
1638
u"%s not a character device"
1639
% os.path.devnull)
650
"/dev/null not a character device")
1640
651
os.dup2(null, sys.stdin.fileno())
1641
652
os.dup2(null, sys.stdout.fileno())
1642
653
os.dup2(null, sys.stderr.fileno())
1645
656
1646
657
1647
658
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]
659
global main_loop_started
660
main_loop_started = False
661
662
parser = OptionParser(version = "%%prog %s" % version)
663
parser.add_option("-i", "--interface", type="string",
664
metavar="IF", help="Bind to interface IF")
665
parser.add_option("-a", "--address", type="string",
666
help="Address to listen for requests on")
667
parser.add_option("-p", "--port", type="int",
668
help="Port number to receive requests on")
669
parser.add_option("--check", action="store_true", default=False,
670
help="Run self-test")
671
parser.add_option("--debug", action="store_true",
672
help="Debug mode; run in foreground and log to"
673
" terminal")
674
parser.add_option("--priority", type="string", help="GnuTLS"
675
" priority string (see GnuTLS documentation)")
676
parser.add_option("--servicename", type="string", metavar="NAME",
677
help="Zeroconf service name")
678
parser.add_option("--configdir", type="string",
679
default="/etc/mandos", metavar="DIR",
680
help="Directory to search for configuration"
681
" files")
682
(options, args) = parser.parse_args()
1680
683
1681
684
if options.check:
1682
685
import doctest
1684
687
sys.exit()
1685
688
1686
689
# 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"",
690
server_defaults = { "interface": "",
691
"address": "",
692
"port": "",
693
"debug": "False",
694
"priority":
695
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
696
"servicename": "Mandos",
1697
697
}
1698
698
1699
699
# Parse config file for server-global settings
1700
server_config = configparser.SafeConfigParser(server_defaults)
700
server_config = ConfigParser.SafeConfigParser(server_defaults)
1701
701
del server_defaults
1702
server_config.read(os.path.join(options.configdir,
1703
u"mandos.conf"))
702
server_config.read(os.path.join(options.configdir, "mandos.conf"))
703
server_section = "server"
1704
704
# 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")
705
server_settings = dict(server_config.items(server_section))
706
# Use getboolean on the boolean config option
707
server_settings["debug"] = server_config.getboolean\
708
(server_section, "debug")
1713
709
del server_config
1714
710
1715
711
# Override the settings from the config file with command line
1716
712
# 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"):
713
for option in ("interface", "address", "port", "debug",
714
"priority", "servicename", "configdir"):
1720
715
value = getattr(options, option)
1721
716
if value is not None:
1722
717
server_settings[option] = value
1723
718
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
719
# Now we have our good server settings in "server_settings"
1729
720
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)
721
debug = server_settings["debug"]
722
1768
723
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
724
syslogger.setLevel(logging.WARNING)
1798
725
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
726
727
if server_settings["servicename"] != "Mandos":
728
syslogger.setFormatter(logging.Formatter\
729
('Mandos (%s): %%(levelname)s:'
730
' %%(message)s'
731
% server_settings["servicename"]))
732
733
# Parse config file with clients
734
client_defaults = { "timeout": "1h",
735
"interval": "5m",
736
"checker": "fping -q -- %%(host)s",
737
}
738
client_config = ConfigParser.SafeConfigParser(client_defaults)
739
client_config.read(os.path.join(server_settings["configdir"],
740
"clients.conf"))
741
742
global service
743
service = AvahiService(name = server_settings["servicename"],
744
type = "_mandos._tcp", );
745
if server_settings["interface"]:
746
service.interface = if_nametoindex(server_settings["interface"])
1827
747
1828
748
global main_loop
749
global bus
750
global server
1829
751
# From the Avahi example code
1830
752
DBusGMainLoop(set_as_default=True )
1831
753
main_loop = gobject.MainLoop()
1832
754
bus = dbus.SystemBus()
755
server = dbus.Interface(
756
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
757
avahi.DBUS_INTERFACE_SERVER )
1833
758
# 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
759
760
clients = Set()
761
def remove_from_clients(client):
762
clients.remove(client)
763
if not clients:
764
logger.critical(u"No clients left, exiting")
765
sys.exit()
766
767
clients.update(Set(Client(name = section,
768
stop_hook = remove_from_clients,
769
config
770
= dict(client_config.items(section)))
771
for section in client_config.sections()))
772
if not clients:
773
logger.critical(u"No clients defined")
774
sys.exit(1)
775
1851
776
if not debug:
1852
# Close all input and output, do double fork, etc.
777
logger.removeHandler(console)
1853
778
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
779
780
pidfilename = "/var/run/mandos/mandos.pid"
781
pid = os.getpid()
782
try:
783
pidfile = open(pidfilename, "w")
784
pidfile.write(str(pid) + "\n")
785
pidfile.close()
786
del pidfile
787
except IOError, err:
788
logger.error(u"Could not write %s file with PID %d",
789
pidfilename, os.getpid())
790
791
def cleanup():
792
"Cleanup function; run on exit"
793
global group
794
# From the Avahi example code
795
if not group is None:
796
group.Free()
797
group = None
798
# End of Avahi example code
799
800
while clients:
801
client = clients.pop()
802
client.stop_hook = None
803
client.stop()
804
805
atexit.register(cleanup)
806
1881
807
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
808
signal.signal(signal.SIGINT, signal.SIG_IGN)
1896
1897
809
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1898
810
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1899
811
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
812
for client in clients:
813
client.start()
814
815
tcp_server = IPv6_TCPServer((server_settings["address"],
816
server_settings["port"]),
817
tcp_handler,
818
settings=server_settings,
819
clients=clients)
1982
820
# Find out what port we got
1983
821
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())
822
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
823
u" scope_id %d" % tcp_server.socket.getsockname())
1991
824
1992
825
#service.interface = tcp_server.socket.getsockname()[3]
1993
826
1994
827
try:
1995
828
# From the Avahi example code
829
server.connect_to_signal("StateChanged", server_state_changed)
1996
830
try:
1997
service.activate()
831
server_state_changed(server.GetState())
1998
832
except dbus.exceptions.DBusException, error:
1999
833
logger.critical(u"DBusException: %s", error)
2000
cleanup()
2001
834
sys.exit(1)
2002
835
# End of Avahi example code
2003
836
2004
837
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2005
838
lambda *args, **kwargs:
2006
(tcp_server.handle_request
2007
(*args[2:], **kwargs) or True))
839
tcp_server.handle_request\
840
(*args[2:], **kwargs) or True)
2008
841
2009
842
logger.debug(u"Starting main loop")
843
main_loop_started = True
2010
844
main_loop.run()
2011
845
except AvahiError, error:
2012
logger.critical(u"AvahiError: %s", error)
2013
cleanup()
846
logger.critical(u"AvahiError: %s" + unicode(error))
2014
847
sys.exit(1)
2015
848
except KeyboardInterrupt:
2016
849
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()
850
print
2022
851
2023
852
if __name__ == '__main__':
2024
853
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0