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- Committer: Björn Påhlsson
- Date: 2008-07-20 03:51:41 UTC
- Revision ID: belorn@braxen-20080720035141-ta0y0be7fotdm4ks
Fixed a overbufferflow bug, thanks to a forgotten \0
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
1
1
#!/usr/bin/python
2
# -*- mode: python; coding: utf-8 -*-
3
#
4
# Mandos server - give out binary blobs to connecting clients.
5
#
6
# This program is partly derived from an example program for an Avahi
7
# service publisher, downloaded from
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add", "remove", "server_state_changed",
10
# "entry_group_state_changed", "cleanup", and "activate" in the
11
# "AvahiService" class, and some lines in "main".
12
#
13
# Everything else is
14
# Copyright © 2008,2009 Teddy Hogeborn
15
# Copyright © 2008,2009 Björn Påhlsson
16
#
17
# This program is free software: you can redistribute it and/or modify
18
# it under the terms of the GNU General Public License as published by
19
# the Free Software Foundation, either version 3 of the License, or
20
# (at your option) any later version.
21
#
22
# This program is distributed in the hope that it will be useful,
23
# but WITHOUT ANY WARRANTY; without even the implied warranty of
24
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25
# GNU General Public License for more details.
26
#
27
# You should have received a copy of the GNU General Public License
28
# along with this program. If not, see
29
# <http://www.gnu.org/licenses/>.
30
#
31
# Contact the authors at <mandos@fukt.bsnet.se>.
32
#
33
34
from __future__ import division, with_statement, absolute_import
35
36
import SocketServer as socketserver
2
3
from __future__ import division
4
5
import SocketServer
37
6
import socket
38
import optparse
7
import select
8
from optparse import OptionParser
39
9
import datetime
40
10
import errno
41
11
import gnutls.crypto
44
14
import gnutls.library.functions
45
15
import gnutls.library.constants
46
16
import gnutls.library.types
47
import ConfigParser as configparser
17
import ConfigParser
48
18
import sys
49
19
import re
50
20
import os
51
21
import signal
22
from sets import Set
52
23
import subprocess
53
import atexit
54
import stat
55
import logging
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
24
65
25
import dbus
66
import dbus.service
67
26
import gobject
68
27
import avahi
69
28
from dbus.mainloop.glib import DBusGMainLoop
70
29
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'))
94
logger.addHandler(syslogger)
95
96
console = logging.StreamHandler()
97
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
98
u' %(levelname)s:'
99
u' %(message)s'))
100
logger.addHandler(console)
101
102
class AvahiError(Exception):
103
def __init__(self, value, *args, **kwargs):
104
self.value = value
105
super(AvahiError, self).__init__(value, *args, **kwargs)
106
def __unicode__(self):
107
return unicode(repr(self.value))
108
109
class AvahiServiceError(AvahiError):
110
pass
111
112
class AvahiGroupError(AvahiError):
113
pass
114
115
116
class AvahiService(object):
117
"""An Avahi (Zeroconf) service.
118
119
Attributes:
120
interface: integer; avahi.IF_UNSPEC or an interface index.
121
Used to optionally bind to the specified interface.
122
name: string; Example: u'Mandos'
123
type: string; Example: u'_mandos._tcp'.
124
See <http://www.dns-sd.org/ServiceTypes.html>
125
port: integer; what port to announce
126
TXT: list of strings; TXT record for the service
127
domain: string; Domain to publish on, default to .local if empty.
128
host: string; Host to publish records for, default is localhost
129
max_renames: integer; maximum number of renames
130
rename_count: integer; counter so we only rename after collisions
131
a sensible number of times
132
group: D-Bus Entry Group
133
server: D-Bus Server
134
bus: dbus.SystemBus()
135
"""
136
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):
140
self.interface = interface
141
self.name = name
142
self.type = servicetype
143
self.port = port
144
self.TXT = TXT if TXT is not None else []
145
self.domain = domain
146
self.host = host
147
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
def rename(self):
154
"""Derived from the Avahi example code"""
155
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))
167
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)
174
self.rename_count += 1
175
def remove(self):
176
"""Derived from the Avahi example code"""
177
if self.group is not None:
178
self.group.Reset()
179
def add(self):
180
"""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())
30
31
import logging
32
import logging.handlers
33
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
35
36
logger = logging.Logger('mandos')
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
38
39
# This variable is used to optionally bind to a specified interface.
40
# It is a global variable to fit in with the other variables from the
41
# Avahi server example code.
42
serviceInterface = avahi.IF_UNSPEC
43
# From the Avahi server example code:
44
serviceName = "Mandos"
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
46
servicePort = None # Not known at startup
47
serviceTXT = [] # TXT record for the service
48
domain = "" # Domain to publish on, default to .local
49
host = "" # Host to publish records for, default to localhost
50
group = None #our entry group
51
rename_count = 12 # Counter so we only rename after collisions a
52
# sensible number of times
53
# End of Avahi example code
237
54
238
55
239
56
class Client(object):
240
57
"""A representation of a client host served by this server.
241
242
58
Attributes:
243
name: string; from the config file, used in log messages and
244
D-Bus identifiers
59
name: string; from the config file, used in log messages
245
60
fingerprint: string (40 or 32 hexadecimal digits); used to
246
61
uniquely identify the client
247
secret: bytestring; sent verbatim (over TLS) to client
248
host: string; available for use by the checker command
249
created: datetime.datetime(); (UTC) object creation
250
last_enabled: datetime.datetime(); (UTC)
251
enabled: bool()
252
last_checked_ok: datetime.datetime(); (UTC) or None
253
timeout: datetime.timedelta(); How long from last_checked_ok
254
until this client is disabled
255
interval: datetime.timedelta(); How often to start a new checker
256
disable_hook: If set, called by disable() as disable_hook(self)
257
checker: subprocess.Popen(); a running checker process used
258
to see if the client lives.
259
'None' if no process is running.
62
secret: bytestring; sent verbatim (over TLS) to client
63
fqdn: string (FQDN); available for use by the checker command
64
created: datetime.datetime()
65
last_seen: datetime.datetime() or None if not yet seen
66
timeout: datetime.timedelta(); How long from last_seen until
67
this client is invalid
68
interval: datetime.timedelta(); How often to start a new checker
69
stop_hook: If set, called by stop() as stop_hook(self)
70
checker: subprocess.Popen(); a running checker process used
71
to see if the client lives.
72
Is None if no process is running.
260
73
checker_initiator_tag: a gobject event source tag, or None
261
disable_initiator_tag: - '' -
74
stop_initiator_tag: - '' -
262
75
checker_callback_tag: - '' -
263
76
checker_command: string; External command which is run to check if
264
client lives. %() expansions are done at
77
client lives. %()s expansions are done at
265
78
runtime with vars(self) as dict, so that for
266
79
instance %(name)s can be used in the command.
267
current_checker_command: string; current running checker_command
268
approved_delay: datetime.timedelta(); Time to wait for approval
269
_approved: bool(); 'None' if not yet approved/disapproved
270
approved_duration: datetime.timedelta(); Duration of one approval
80
Private attibutes:
81
_timeout: Real variable for 'timeout'
82
_interval: Real variable for 'interval'
83
_timeout_milliseconds: Used by gobject.timeout_add()
84
_interval_milliseconds: - '' -
271
85
"""
272
273
@staticmethod
274
def _timedelta_to_milliseconds(td):
275
"Convert a datetime.timedelta() to milliseconds"
276
return ((td.days * 24 * 60 * 60 * 1000)
277
+ (td.seconds * 1000)
278
+ (td.microseconds // 1000))
279
280
def timeout_milliseconds(self):
281
"Return the 'timeout' attribute in milliseconds"
282
return self._timedelta_to_milliseconds(self.timeout)
283
284
def interval_milliseconds(self):
285
"Return the 'interval' attribute in milliseconds"
286
return self._timedelta_to_milliseconds(self.interval)
287
288
def approved_delay_milliseconds(self):
289
return self._timedelta_to_milliseconds(self.approved_delay)
290
291
def __init__(self, name = None, disable_hook=None, config=None):
292
"""Note: the 'checker' key in 'config' sets the
293
'checker_command' attribute and *not* the 'checker'
294
attribute."""
86
def _set_timeout(self, timeout):
87
"Setter function for 'timeout' attribute"
88
self._timeout = timeout
89
self._timeout_milliseconds = ((self.timeout.days
90
* 24 * 60 * 60 * 1000)
91
+ (self.timeout.seconds * 1000)
92
+ (self.timeout.microseconds
93
// 1000))
94
timeout = property(lambda self: self._timeout,
95
_set_timeout)
96
del _set_timeout
97
def _set_interval(self, interval):
98
"Setter function for 'interval' attribute"
99
self._interval = interval
100
self._interval_milliseconds = ((self.interval.days
101
* 24 * 60 * 60 * 1000)
102
+ (self.interval.seconds
103
* 1000)
104
+ (self.interval.microseconds
105
// 1000))
106
interval = property(lambda self: self._interval,
107
_set_interval)
108
del _set_interval
109
def __init__(self, name=None, options=None, stop_hook=None,
110
fingerprint=None, secret=None, secfile=None, fqdn=None,
111
timeout=None, interval=-1, checker=None):
295
112
self.name = name
296
if config is None:
297
config = {}
298
logger.debug(u"Creating client %r", self.name)
299
# Uppercase and remove spaces from fingerprint for later
300
# comparison purposes with return value from the fingerprint()
301
# function
302
self.fingerprint = (config[u"fingerprint"].upper()
303
.replace(u" ", u""))
304
logger.debug(u" Fingerprint: %s", self.fingerprint)
305
if u"secret" in config:
306
self.secret = config[u"secret"].decode(u"base64")
307
elif u"secfile" in config:
308
with open(os.path.expanduser(os.path.expandvars
309
(config[u"secfile"])),
310
"rb") as secfile:
311
self.secret = secfile.read()
312
else:
313
raise TypeError(u"No secret or secfile for client %s"
314
% self.name)
315
self.host = config.get(u"host", u"")
316
self.created = datetime.datetime.utcnow()
317
self.enabled = False
318
self.last_enabled = None
319
self.last_checked_ok = None
320
self.timeout = string_to_delta(config[u"timeout"])
321
self.interval = string_to_delta(config[u"interval"])
322
self.disable_hook = disable_hook
113
# Uppercase and remove spaces from fingerprint
114
# for later comparison purposes with return value of
115
# the fingerprint() function
116
self.fingerprint = fingerprint.upper().replace(u" ", u"")
117
if secret:
118
self.secret = secret.decode(u"base64")
119
elif secfile:
120
sf = open(secfile)
121
self.secret = sf.read()
122
sf.close()
123
else:
124
raise RuntimeError(u"No secret or secfile for client %s"
125
% self.name)
126
self.fqdn = fqdn # string
127
self.created = datetime.datetime.now()
128
self.last_seen = None
129
if timeout is None:
130
timeout = options.timeout
131
self.timeout = timeout
132
if interval == -1:
133
interval = options.interval
134
else:
135
interval = string_to_delta(interval)
136
self.interval = interval
137
self.stop_hook = stop_hook
323
138
self.checker = None
324
139
self.checker_initiator_tag = None
325
self.disable_initiator_tag = None
140
self.stop_initiator_tag = None
326
141
self.checker_callback_tag = None
327
self.checker_command = config[u"checker"]
328
self.current_checker_command = None
329
self.last_connect = None
330
self._approved = None
331
self.approved_by_default = config.get(u"approved_by_default",
332
True)
333
self.approvals_pending = 0
334
self.approved_delay = string_to_delta(
335
config[u"approved_delay"])
336
self.approved_duration = string_to_delta(
337
config[u"approved_duration"])
338
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
339
340
def send_changedstate(self):
341
self.changedstate.acquire()
342
self.changedstate.notify_all()
343
self.changedstate.release()
344
345
def enable(self):
346
"""Start this client's checker and timeout hooks"""
347
if getattr(self, u"enabled", False):
348
# Already enabled
349
return
350
self.send_changedstate()
351
self.last_enabled = datetime.datetime.utcnow()
142
self.check_command = checker
143
def start(self):
144
"""Start this clients checker and timeout hooks"""
352
145
# Schedule a new checker to be started an 'interval' from now,
353
146
# and every interval from then on.
354
self.checker_initiator_tag = (gobject.timeout_add
355
(self.interval_milliseconds(),
356
self.start_checker))
357
# Schedule a disable() when 'timeout' has passed
358
self.disable_initiator_tag = (gobject.timeout_add
359
(self.timeout_milliseconds(),
360
self.disable))
361
self.enabled = True
147
self.checker_initiator_tag = gobject.timeout_add\
148
(self._interval_milliseconds,
149
self.start_checker)
362
150
# Also start a new checker *right now*.
363
151
self.start_checker()
364
365
def disable(self, quiet=True):
366
"""Disable this client."""
367
if not getattr(self, "enabled", False):
368
return False
369
if not quiet:
370
self.send_changedstate()
371
if not quiet:
372
logger.info(u"Disabling client %s", self.name)
373
if getattr(self, u"disable_initiator_tag", False):
374
gobject.source_remove(self.disable_initiator_tag)
375
self.disable_initiator_tag = None
376
if getattr(self, u"checker_initiator_tag", False):
152
# Schedule a stop() when 'timeout' has passed
153
self.stop_initiator_tag = gobject.timeout_add\
154
(self._timeout_milliseconds,
155
self.stop)
156
def stop(self):
157
"""Stop this client.
158
The possibility that this client might be restarted is left
159
open, but not currently used."""
160
logger.debug(u"Stopping client %s", self.name)
161
self.secret = None
162
if self.stop_initiator_tag:
163
gobject.source_remove(self.stop_initiator_tag)
164
self.stop_initiator_tag = None
165
if self.checker_initiator_tag:
377
166
gobject.source_remove(self.checker_initiator_tag)
378
167
self.checker_initiator_tag = None
379
168
self.stop_checker()
380
if self.disable_hook:
381
self.disable_hook(self)
382
self.enabled = False
169
if self.stop_hook:
170
self.stop_hook(self)
383
171
# Do not run this again if called by a gobject.timeout_add
384
172
return False
385
386
173
def __del__(self):
387
self.disable_hook = None
388
self.disable()
389
390
def checker_callback(self, pid, condition, command):
174
# Some code duplication here and in stop()
175
if hasattr(self, "stop_initiator_tag") \
176
and self.stop_initiator_tag:
177
gobject.source_remove(self.stop_initiator_tag)
178
self.stop_initiator_tag = None
179
if hasattr(self, "checker_initiator_tag") \
180
and self.checker_initiator_tag:
181
gobject.source_remove(self.checker_initiator_tag)
182
self.checker_initiator_tag = None
183
self.stop_checker()
184
def checker_callback(self, pid, condition):
391
185
"""The checker has completed, so take appropriate actions."""
392
self.checker_callback_tag = None
393
self.checker = None
394
if os.WIFEXITED(condition):
395
exitstatus = os.WEXITSTATUS(condition)
396
if exitstatus == 0:
397
logger.info(u"Checker for %(name)s succeeded",
398
vars(self))
399
self.checked_ok()
400
else:
401
logger.info(u"Checker for %(name)s failed",
402
vars(self))
403
else:
186
now = datetime.datetime.now()
187
if os.WIFEXITED(condition) \
188
and (os.WEXITSTATUS(condition) == 0):
189
logger.debug(u"Checker for %(name)s succeeded",
190
vars(self))
191
self.last_seen = now
192
gobject.source_remove(self.stop_initiator_tag)
193
self.stop_initiator_tag = gobject.timeout_add\
194
(self._timeout_milliseconds,
195
self.stop)
196
if not os.WIFEXITED(condition):
404
197
logger.warning(u"Checker for %(name)s crashed?",
405
198
vars(self))
406
407
def checked_ok(self):
408
"""Bump up the timeout for this client.
409
410
This should only be called when the client has been seen,
411
alive and well.
412
"""
413
self.last_checked_ok = datetime.datetime.utcnow()
414
gobject.source_remove(self.disable_initiator_tag)
415
self.disable_initiator_tag = (gobject.timeout_add
416
(self.timeout_milliseconds(),
417
self.disable))
418
199
else:
200
logger.debug(u"Checker for %(name)s failed",
201
vars(self))
202
self.checker = None
203
self.checker_callback_tag = None
419
204
def start_checker(self):
420
205
"""Start a new checker subprocess if one is not running.
421
422
206
If a checker already exists, leave it running and do
423
207
nothing."""
424
# The reason for not killing a running checker is that if we
425
# did that, then if a checker (for some reason) started
426
# running slowly and taking more than 'interval' time, the
427
# client would inevitably timeout, since no checker would get
428
# a chance to run to completion. If we instead leave running
429
# checkers alone, the checker would have to take more time
430
# than 'timeout' for the client to be disabled, which is as it
431
# should be.
432
433
# If a checker exists, make sure it is not a zombie
434
try:
435
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
436
except (AttributeError, OSError), error:
437
if (isinstance(error, OSError)
438
and error.errno != errno.ECHILD):
439
raise error
440
else:
441
if pid:
442
logger.warning(u"Checker was a zombie")
443
gobject.source_remove(self.checker_callback_tag)
444
self.checker_callback(pid, status,
445
self.current_checker_command)
446
# Start a new checker if needed
447
208
if self.checker is None:
209
logger.debug(u"Starting checker for %s",
210
self.name)
448
211
try:
449
# In case checker_command has exactly one % operator
450
command = self.checker_command % self.host
212
command = self.check_command % self.fqdn
451
213
except TypeError:
452
# Escape attributes for the shell
453
escaped_attrs = dict((key,
454
re.escape(unicode(str(val),
455
errors=
456
u'replace')))
214
escaped_attrs = dict((key, re.escape(str(val)))
457
215
for key, val in
458
216
vars(self).iteritems())
459
217
try:
460
command = self.checker_command % escaped_attrs
218
command = self.check_command % escaped_attrs
461
219
except TypeError, error:
462
logger.error(u'Could not format string "%s":'
463
u' %s', self.checker_command, error)
220
logger.critical(u'Could not format string "%s": %s',
221
self.check_command, error)
464
222
return True # Try again later
465
self.current_checker_command = command
466
223
try:
467
logger.info(u"Starting checker %r for %s",
468
command, self.name)
469
# We don't need to redirect stdout and stderr, since
470
# in normal mode, that is already done by daemon(),
471
# and in debug mode we don't want to. (Stdin is
472
# always replaced by /dev/null.)
473
self.checker = subprocess.Popen(command,
474
close_fds=True,
475
shell=True, cwd=u"/")
476
self.checker_callback_tag = (gobject.child_watch_add
477
(self.checker.pid,
478
self.checker_callback,
479
data=command))
480
# The checker may have completed before the gobject
481
# watch was added. Check for this.
482
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
483
if pid:
484
gobject.source_remove(self.checker_callback_tag)
485
self.checker_callback(pid, status, command)
486
except OSError, error:
224
self.checker = subprocess.\
225
Popen(command,
226
stdout=subprocess.PIPE,
227
close_fds=True, shell=True,
228
cwd="/")
229
self.checker_callback_tag = gobject.\
230
child_watch_add(self.checker.pid,
231
self.\
232
checker_callback)
233
except subprocess.OSError, error:
487
234
logger.error(u"Failed to start subprocess: %s",
488
235
error)
489
236
# Re-run this periodically if run by gobject.timeout_add
490
237
return True
491
492
238
def stop_checker(self):
493
239
"""Force the checker process, if any, to stop."""
494
if self.checker_callback_tag:
495
gobject.source_remove(self.checker_callback_tag)
496
self.checker_callback_tag = None
497
if getattr(self, u"checker", None) is None:
240
if not hasattr(self, "checker") or self.checker is None:
498
241
return
499
logger.debug(u"Stopping checker for %(name)s", vars(self))
500
try:
501
os.kill(self.checker.pid, signal.SIGTERM)
502
#time.sleep(0.5)
503
#if self.checker.poll() is None:
504
# os.kill(self.checker.pid, signal.SIGKILL)
505
except OSError, error:
506
if error.errno != errno.ESRCH: # No such process
507
raise
508
self.checker = None
509
510
def dbus_service_property(dbus_interface, signature=u"v",
511
access=u"readwrite", byte_arrays=False):
512
"""Decorators for marking methods of a DBusObjectWithProperties to
513
become properties on the D-Bus.
514
515
The decorated method will be called with no arguments by "Get"
516
and with one argument by "Set".
517
518
The parameters, where they are supported, are the same as
519
dbus.service.method, except there is only "signature", since the
520
type from Get() and the type sent to Set() is the same.
521
"""
522
# Encoding deeply encoded byte arrays is not supported yet by the
523
# "Set" method, so we fail early here:
524
if byte_arrays and signature != u"ay":
525
raise ValueError(u"Byte arrays not supported for non-'ay'"
526
u" signature %r" % signature)
527
def decorator(func):
528
func._dbus_is_property = True
529
func._dbus_interface = dbus_interface
530
func._dbus_signature = signature
531
func._dbus_access = access
532
func._dbus_name = func.__name__
533
if func._dbus_name.endswith(u"_dbus_property"):
534
func._dbus_name = func._dbus_name[:-14]
535
func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
536
return func
537
return decorator
538
539
540
class DBusPropertyException(dbus.exceptions.DBusException):
541
"""A base class for D-Bus property-related exceptions
542
"""
543
def __unicode__(self):
544
return unicode(str(self))
545
546
547
class DBusPropertyAccessException(DBusPropertyException):
548
"""A property's access permissions disallows an operation.
549
"""
550
pass
551
552
553
class DBusPropertyNotFound(DBusPropertyException):
554
"""An attempt was made to access a non-existing property.
555
"""
556
pass
557
558
559
class DBusObjectWithProperties(dbus.service.Object):
560
"""A D-Bus object with properties.
561
562
Classes inheriting from this can use the dbus_service_property
563
decorator to expose methods as D-Bus properties. It exposes the
564
standard Get(), Set(), and GetAll() methods on the D-Bus.
565
"""
566
567
@staticmethod
568
def _is_dbus_property(obj):
569
return getattr(obj, u"_dbus_is_property", False)
570
571
def _get_all_dbus_properties(self):
572
"""Returns a generator of (name, attribute) pairs
573
"""
574
return ((prop._dbus_name, prop)
575
for name, prop in
576
inspect.getmembers(self, self._is_dbus_property))
577
578
def _get_dbus_property(self, interface_name, property_name):
579
"""Returns a bound method if one exists which is a D-Bus
580
property with the specified name and interface.
581
"""
582
for name in (property_name,
583
property_name + u"_dbus_property"):
584
prop = getattr(self, name, None)
585
if (prop is None
586
or not self._is_dbus_property(prop)
587
or prop._dbus_name != property_name
588
or (interface_name and prop._dbus_interface
589
and interface_name != prop._dbus_interface)):
590
continue
591
return prop
592
# No such property
593
raise DBusPropertyNotFound(self.dbus_object_path + u":"
594
+ interface_name + u"."
595
+ property_name)
596
597
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
598
out_signature=u"v")
599
def Get(self, interface_name, property_name):
600
"""Standard D-Bus property Get() method, see D-Bus standard.
601
"""
602
prop = self._get_dbus_property(interface_name, property_name)
603
if prop._dbus_access == u"write":
604
raise DBusPropertyAccessException(property_name)
605
value = prop()
606
if not hasattr(value, u"variant_level"):
607
return value
608
return type(value)(value, variant_level=value.variant_level+1)
609
610
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
611
def Set(self, interface_name, property_name, value):
612
"""Standard D-Bus property Set() method, see D-Bus standard.
613
"""
614
prop = self._get_dbus_property(interface_name, property_name)
615
if prop._dbus_access == u"read":
616
raise DBusPropertyAccessException(property_name)
617
if prop._dbus_get_args_options[u"byte_arrays"]:
618
# The byte_arrays option is not supported yet on
619
# signatures other than "ay".
620
if prop._dbus_signature != u"ay":
621
raise ValueError
622
value = dbus.ByteArray(''.join(unichr(byte)
623
for byte in value))
624
prop(value)
625
626
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
627
out_signature=u"a{sv}")
628
def GetAll(self, interface_name):
629
"""Standard D-Bus property GetAll() method, see D-Bus
630
standard.
631
632
Note: Will not include properties with access="write".
633
"""
634
all = {}
635
for name, prop in self._get_all_dbus_properties():
636
if (interface_name
637
and interface_name != prop._dbus_interface):
638
# Interface non-empty but did not match
639
continue
640
# Ignore write-only properties
641
if prop._dbus_access == u"write":
642
continue
643
value = prop()
644
if not hasattr(value, u"variant_level"):
645
all[name] = value
646
continue
647
all[name] = type(value)(value, variant_level=
648
value.variant_level+1)
649
return dbus.Dictionary(all, signature=u"sv")
650
651
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
652
out_signature=u"s",
653
path_keyword='object_path',
654
connection_keyword='connection')
655
def Introspect(self, object_path, connection):
656
"""Standard D-Bus method, overloaded to insert property tags.
657
"""
658
xmlstring = dbus.service.Object.Introspect(self, object_path,
659
connection)
660
try:
661
document = xml.dom.minidom.parseString(xmlstring)
662
def make_tag(document, name, prop):
663
e = document.createElement(u"property")
664
e.setAttribute(u"name", name)
665
e.setAttribute(u"type", prop._dbus_signature)
666
e.setAttribute(u"access", prop._dbus_access)
667
return e
668
for if_tag in document.getElementsByTagName(u"interface"):
669
for tag in (make_tag(document, name, prop)
670
for name, prop
671
in self._get_all_dbus_properties()
672
if prop._dbus_interface
673
== if_tag.getAttribute(u"name")):
674
if_tag.appendChild(tag)
675
# Add the names to the return values for the
676
# "org.freedesktop.DBus.Properties" methods
677
if (if_tag.getAttribute(u"name")
678
== u"org.freedesktop.DBus.Properties"):
679
for cn in if_tag.getElementsByTagName(u"method"):
680
if cn.getAttribute(u"name") == u"Get":
681
for arg in cn.getElementsByTagName(u"arg"):
682
if (arg.getAttribute(u"direction")
683
== u"out"):
684
arg.setAttribute(u"name", u"value")
685
elif cn.getAttribute(u"name") == u"GetAll":
686
for arg in cn.getElementsByTagName(u"arg"):
687
if (arg.getAttribute(u"direction")
688
== u"out"):
689
arg.setAttribute(u"name", u"props")
690
xmlstring = document.toxml(u"utf-8")
691
document.unlink()
692
except (AttributeError, xml.dom.DOMException,
693
xml.parsers.expat.ExpatError), error:
694
logger.error(u"Failed to override Introspection method",
695
error)
696
return xmlstring
697
698
699
class ClientDBus(Client, DBusObjectWithProperties):
700
"""A Client class using D-Bus
701
702
Attributes:
703
dbus_object_path: dbus.ObjectPath
704
bus: dbus.SystemBus()
705
"""
706
# dbus.service.Object doesn't use super(), so we can't either.
707
708
def __init__(self, bus = None, *args, **kwargs):
709
self._approvals_pending = 0
710
self.bus = bus
711
Client.__init__(self, *args, **kwargs)
712
# Only now, when this client is initialized, can it show up on
713
# the D-Bus
714
self.dbus_object_path = (dbus.ObjectPath
715
(u"/clients/"
716
+ self.name.replace(u".", u"_")))
717
DBusObjectWithProperties.__init__(self, self.bus,
718
self.dbus_object_path)
719
720
def _get_approvals_pending(self):
721
return self._approvals_pending
722
def _set_approvals_pending(self, value):
723
old_value = self._approvals_pending
724
self._approvals_pending = value
725
bval = bool(value)
726
if (hasattr(self, "dbus_object_path")
727
and bval is not bool(old_value)):
728
dbus_bool = dbus.Boolean(bval, variant_level=1)
729
self.PropertyChanged(dbus.String(u"approved_pending"),
730
dbus_bool)
731
732
approvals_pending = property(_get_approvals_pending,
733
_set_approvals_pending)
734
del _get_approvals_pending, _set_approvals_pending
735
736
@staticmethod
737
def _datetime_to_dbus(dt, variant_level=0):
738
"""Convert a UTC datetime.datetime() to a D-Bus type."""
739
return dbus.String(dt.isoformat(),
740
variant_level=variant_level)
741
742
def enable(self):
743
oldstate = getattr(self, u"enabled", False)
744
r = Client.enable(self)
745
if oldstate != self.enabled:
746
# Emit D-Bus signals
747
self.PropertyChanged(dbus.String(u"enabled"),
748
dbus.Boolean(True, variant_level=1))
749
self.PropertyChanged(
750
dbus.String(u"last_enabled"),
751
self._datetime_to_dbus(self.last_enabled,
752
variant_level=1))
753
return r
754
755
def disable(self, quiet = False):
756
oldstate = getattr(self, u"enabled", False)
757
r = Client.disable(self, quiet=quiet)
758
if not quiet and oldstate != self.enabled:
759
# Emit D-Bus signal
760
self.PropertyChanged(dbus.String(u"enabled"),
761
dbus.Boolean(False, variant_level=1))
762
return r
763
764
def __del__(self, *args, **kwargs):
765
try:
766
self.remove_from_connection()
767
except LookupError:
768
pass
769
if hasattr(DBusObjectWithProperties, u"__del__"):
770
DBusObjectWithProperties.__del__(self, *args, **kwargs)
771
Client.__del__(self, *args, **kwargs)
772
773
def checker_callback(self, pid, condition, command,
774
*args, **kwargs):
242
gobject.source_remove(self.checker_callback_tag)
775
243
self.checker_callback_tag = None
244
os.kill(self.checker.pid, signal.SIGTERM)
245
if self.checker.poll() is None:
246
os.kill(self.checker.pid, signal.SIGKILL)
776
247
self.checker = None
777
# Emit D-Bus signal
778
self.PropertyChanged(dbus.String(u"checker_running"),
779
dbus.Boolean(False, variant_level=1))
780
if os.WIFEXITED(condition):
781
exitstatus = os.WEXITSTATUS(condition)
782
# Emit D-Bus signal
783
self.CheckerCompleted(dbus.Int16(exitstatus),
784
dbus.Int64(condition),
785
dbus.String(command))
786
else:
787
# Emit D-Bus signal
788
self.CheckerCompleted(dbus.Int16(-1),
789
dbus.Int64(condition),
790
dbus.String(command))
791
792
return Client.checker_callback(self, pid, condition, command,
793
*args, **kwargs)
794
795
def checked_ok(self, *args, **kwargs):
796
r = Client.checked_ok(self, *args, **kwargs)
797
# Emit D-Bus signal
798
self.PropertyChanged(
799
dbus.String(u"last_checked_ok"),
800
(self._datetime_to_dbus(self.last_checked_ok,
801
variant_level=1)))
802
return r
803
804
def start_checker(self, *args, **kwargs):
805
old_checker = self.checker
806
if self.checker is not None:
807
old_checker_pid = self.checker.pid
808
else:
809
old_checker_pid = None
810
r = Client.start_checker(self, *args, **kwargs)
811
# Only if new checker process was started
812
if (self.checker is not None
813
and old_checker_pid != self.checker.pid):
814
# Emit D-Bus signal
815
self.CheckerStarted(self.current_checker_command)
816
self.PropertyChanged(
817
dbus.String(u"checker_running"),
818
dbus.Boolean(True, variant_level=1))
819
return r
820
821
def stop_checker(self, *args, **kwargs):
822
old_checker = getattr(self, u"checker", None)
823
r = Client.stop_checker(self, *args, **kwargs)
824
if (old_checker is not None
825
and getattr(self, u"checker", None) is None):
826
self.PropertyChanged(dbus.String(u"checker_running"),
827
dbus.Boolean(False, variant_level=1))
828
return r
829
830
def _reset_approved(self):
831
self._approved = None
832
return False
833
834
def approve(self, value=True):
835
self.send_changedstate()
836
self._approved = value
837
gobject.timeout_add(self._timedelta_to_milliseconds(self.approved_duration),
838
self._reset_approved)
839
840
841
## D-Bus methods, signals & properties
842
_interface = u"se.bsnet.fukt.Mandos.Client"
843
844
## Signals
845
846
# CheckerCompleted - signal
847
@dbus.service.signal(_interface, signature=u"nxs")
848
def CheckerCompleted(self, exitcode, waitstatus, command):
849
"D-Bus signal"
850
pass
851
852
# CheckerStarted - signal
853
@dbus.service.signal(_interface, signature=u"s")
854
def CheckerStarted(self, command):
855
"D-Bus signal"
856
pass
857
858
# PropertyChanged - signal
859
@dbus.service.signal(_interface, signature=u"sv")
860
def PropertyChanged(self, property, value):
861
"D-Bus signal"
862
pass
863
864
# GotSecret - signal
865
@dbus.service.signal(_interface)
866
def GotSecret(self):
867
"""D-Bus signal
868
Is sent after a successful transfer of secret from the Mandos
869
server to mandos-client
870
"""
871
pass
872
873
# Rejected - signal
874
@dbus.service.signal(_interface, signature=u"s")
875
def Rejected(self, reason):
876
"D-Bus signal"
877
pass
878
879
# NeedApproval - signal
880
@dbus.service.signal(_interface, signature=u"db")
881
def NeedApproval(self, timeout, default):
882
"D-Bus signal"
883
pass
884
885
## Methods
886
887
# Approve - method
888
@dbus.service.method(_interface, in_signature=u"b")
889
def Approve(self, value):
890
self.approve(value)
891
892
# CheckedOK - method
893
@dbus.service.method(_interface)
894
def CheckedOK(self):
895
return self.checked_ok()
896
897
# Enable - method
898
@dbus.service.method(_interface)
899
def Enable(self):
900
"D-Bus method"
901
self.enable()
902
903
# StartChecker - method
904
@dbus.service.method(_interface)
905
def StartChecker(self):
906
"D-Bus method"
907
self.start_checker()
908
909
# Disable - method
910
@dbus.service.method(_interface)
911
def Disable(self):
912
"D-Bus method"
913
self.disable()
914
915
# StopChecker - method
916
@dbus.service.method(_interface)
917
def StopChecker(self):
918
self.stop_checker()
919
920
## Properties
921
922
# approved_pending - property
923
@dbus_service_property(_interface, signature=u"b", access=u"read")
924
def approved_pending_dbus_property(self):
925
return dbus.Boolean(bool(self.approvals_pending))
926
927
# approved_by_default - property
928
@dbus_service_property(_interface, signature=u"b",
929
access=u"readwrite")
930
def approved_by_default_dbus_property(self):
931
return dbus.Boolean(self.approved_by_default)
932
933
# approved_delay - property
934
@dbus_service_property(_interface, signature=u"t",
935
access=u"readwrite")
936
def approved_delay_dbus_property(self):
937
return dbus.UInt64(self.approved_delay_milliseconds())
938
939
# approved_duration - property
940
@dbus_service_property(_interface, signature=u"t",
941
access=u"readwrite")
942
def approved_duration_dbus_property(self):
943
return dbus.UInt64(self._timedelta_to_milliseconds(
944
self.approved_duration))
945
946
# name - property
947
@dbus_service_property(_interface, signature=u"s", access=u"read")
948
def name_dbus_property(self):
949
return dbus.String(self.name)
950
951
# fingerprint - property
952
@dbus_service_property(_interface, signature=u"s", access=u"read")
953
def fingerprint_dbus_property(self):
954
return dbus.String(self.fingerprint)
955
956
# host - property
957
@dbus_service_property(_interface, signature=u"s",
958
access=u"readwrite")
959
def host_dbus_property(self, value=None):
960
if value is None: # get
961
return dbus.String(self.host)
962
self.host = value
963
# Emit D-Bus signal
964
self.PropertyChanged(dbus.String(u"host"),
965
dbus.String(value, variant_level=1))
966
967
# created - property
968
@dbus_service_property(_interface, signature=u"s", access=u"read")
969
def created_dbus_property(self):
970
return dbus.String(self._datetime_to_dbus(self.created))
971
972
# last_enabled - property
973
@dbus_service_property(_interface, signature=u"s", access=u"read")
974
def last_enabled_dbus_property(self):
975
if self.last_enabled is None:
976
return dbus.String(u"")
977
return dbus.String(self._datetime_to_dbus(self.last_enabled))
978
979
# enabled - property
980
@dbus_service_property(_interface, signature=u"b",
981
access=u"readwrite")
982
def enabled_dbus_property(self, value=None):
983
if value is None: # get
984
return dbus.Boolean(self.enabled)
985
if value:
986
self.enable()
987
else:
988
self.disable()
989
990
# last_checked_ok - property
991
@dbus_service_property(_interface, signature=u"s",
992
access=u"readwrite")
993
def last_checked_ok_dbus_property(self, value=None):
994
if value is not None:
995
self.checked_ok()
996
return
997
if self.last_checked_ok is None:
998
return dbus.String(u"")
999
return dbus.String(self._datetime_to_dbus(self
1000
.last_checked_ok))
1001
1002
# timeout - property
1003
@dbus_service_property(_interface, signature=u"t",
1004
access=u"readwrite")
1005
def timeout_dbus_property(self, value=None):
1006
if value is None: # get
1007
return dbus.UInt64(self.timeout_milliseconds())
1008
self.timeout = datetime.timedelta(0, 0, 0, value)
1009
# Emit D-Bus signal
1010
self.PropertyChanged(dbus.String(u"timeout"),
1011
dbus.UInt64(value, variant_level=1))
1012
if getattr(self, u"disable_initiator_tag", None) is None:
1013
return
1014
# Reschedule timeout
1015
gobject.source_remove(self.disable_initiator_tag)
1016
self.disable_initiator_tag = None
1017
time_to_die = (self.
1018
_timedelta_to_milliseconds((self
1019
.last_checked_ok
1020
+ self.timeout)
1021
- datetime.datetime
1022
.utcnow()))
1023
if time_to_die <= 0:
1024
# The timeout has passed
1025
self.disable()
1026
else:
1027
self.disable_initiator_tag = (gobject.timeout_add
1028
(time_to_die, self.disable))
1029
1030
# interval - property
1031
@dbus_service_property(_interface, signature=u"t",
1032
access=u"readwrite")
1033
def interval_dbus_property(self, value=None):
1034
if value is None: # get
1035
return dbus.UInt64(self.interval_milliseconds())
1036
self.interval = datetime.timedelta(0, 0, 0, value)
1037
# Emit D-Bus signal
1038
self.PropertyChanged(dbus.String(u"interval"),
1039
dbus.UInt64(value, variant_level=1))
1040
if getattr(self, u"checker_initiator_tag", None) is None:
1041
return
1042
# Reschedule checker run
1043
gobject.source_remove(self.checker_initiator_tag)
1044
self.checker_initiator_tag = (gobject.timeout_add
1045
(value, self.start_checker))
1046
self.start_checker() # Start one now, too
1047
1048
# checker - property
1049
@dbus_service_property(_interface, signature=u"s",
1050
access=u"readwrite")
1051
def checker_dbus_property(self, value=None):
1052
if value is None: # get
1053
return dbus.String(self.checker_command)
1054
self.checker_command = value
1055
# Emit D-Bus signal
1056
self.PropertyChanged(dbus.String(u"checker"),
1057
dbus.String(self.checker_command,
1058
variant_level=1))
1059
1060
# checker_running - property
1061
@dbus_service_property(_interface, signature=u"b",
1062
access=u"readwrite")
1063
def checker_running_dbus_property(self, value=None):
1064
if value is None: # get
1065
return dbus.Boolean(self.checker is not None)
1066
if value:
1067
self.start_checker()
1068
else:
1069
self.stop_checker()
1070
1071
# object_path - property
1072
@dbus_service_property(_interface, signature=u"o", access=u"read")
1073
def object_path_dbus_property(self):
1074
return self.dbus_object_path # is already a dbus.ObjectPath
1075
1076
# secret = property
1077
@dbus_service_property(_interface, signature=u"ay",
1078
access=u"write", byte_arrays=True)
1079
def secret_dbus_property(self, value):
1080
self.secret = str(value)
1081
1082
del _interface
1083
1084
1085
class ProxyClient(object):
1086
def __init__(self, child_pipe, fpr, address):
1087
self._pipe = child_pipe
1088
self._pipe.send(('init', fpr, address))
1089
if not self._pipe.recv():
1090
raise KeyError()
1091
1092
def __getattribute__(self, name):
1093
if(name == '_pipe'):
1094
return super(ProxyClient, self).__getattribute__(name)
1095
self._pipe.send(('getattr', name))
1096
data = self._pipe.recv()
1097
if data[0] == 'data':
1098
return data[1]
1099
if data[0] == 'function':
1100
def func(*args, **kwargs):
1101
self._pipe.send(('funcall', name, args, kwargs))
1102
return self._pipe.recv()[1]
1103
return func
1104
1105
def __setattr__(self, name, value):
1106
if(name == '_pipe'):
1107
return super(ProxyClient, self).__setattr__(name, value)
1108
self._pipe.send(('setattr', name, value))
1109
1110
1111
class ClientHandler(socketserver.BaseRequestHandler, object):
1112
"""A class to handle client connections.
1113
1114
Instantiated once for each connection to handle it.
248
def still_valid(self, now=None):
249
"""Has the timeout not yet passed for this client?"""
250
if now is None:
251
now = datetime.datetime.now()
252
if self.last_seen is None:
253
return now < (self.created + self.timeout)
254
else:
255
return now < (self.last_seen + self.timeout)
256
257
258
def peer_certificate(session):
259
# If not an OpenPGP certificate...
260
if gnutls.library.functions.gnutls_certificate_type_get\
261
(session._c_object) \
262
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
263
# ...do the normal thing
264
return session.peer_certificate
265
list_size = ctypes.c_uint()
266
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
267
(session._c_object, ctypes.byref(list_size))
268
if list_size.value == 0:
269
return None
270
cert = cert_list[0]
271
return ctypes.string_at(cert.data, cert.size)
272
273
274
def fingerprint(openpgp):
275
# New empty GnuTLS certificate
276
crt = gnutls.library.types.gnutls_openpgp_crt_t()
277
gnutls.library.functions.gnutls_openpgp_crt_init\
278
(ctypes.byref(crt))
279
# New GnuTLS "datum" with the OpenPGP public key
280
datum = gnutls.library.types.gnutls_datum_t\
281
(ctypes.cast(ctypes.c_char_p(openpgp),
282
ctypes.POINTER(ctypes.c_ubyte)),
283
ctypes.c_uint(len(openpgp)))
284
# Import the OpenPGP public key into the certificate
285
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
(crt,
287
ctypes.byref(datum),
288
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
289
# New buffer for the fingerprint
290
buffer = ctypes.create_string_buffer(20)
291
buffer_length = ctypes.c_size_t()
292
# Get the fingerprint from the certificate into the buffer
293
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
294
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
295
# Deinit the certificate
296
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
297
# Convert the buffer to a Python bytestring
298
fpr = ctypes.string_at(buffer, buffer_length.value)
299
# Convert the bytestring to hexadecimal notation
300
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
301
return hex_fpr
302
303
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
305
"""A TCP request handler class.
306
Instantiated by IPv6_TCPServer for each request to handle it.
1115
307
Note: This will run in its own forked process."""
1116
308
1117
309
def handle(self):
1118
with contextlib.closing(self.server.child_pipe) as child_pipe:
1119
logger.info(u"TCP connection from: %s",
1120
unicode(self.client_address))
1121
logger.debug(u"Pipe FD: %d",
1122
self.server.child_pipe.fileno())
1123
1124
session = (gnutls.connection
1125
.ClientSession(self.request,
1126
gnutls.connection
1127
.X509Credentials()))
1128
1129
# Note: gnutls.connection.X509Credentials is really a
1130
# generic GnuTLS certificate credentials object so long as
1131
# no X.509 keys are added to it. Therefore, we can use it
1132
# here despite using OpenPGP certificates.
1133
1134
#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
1135
# u"+AES-256-CBC", u"+SHA1",
1136
# u"+COMP-NULL", u"+CTYPE-OPENPGP",
1137
# u"+DHE-DSS"))
1138
# Use a fallback default, since this MUST be set.
1139
priority = self.server.gnutls_priority
1140
if priority is None:
1141
priority = u"NORMAL"
1142
(gnutls.library.functions
1143
.gnutls_priority_set_direct(session._c_object,
1144
priority, None))
1145
1146
# Start communication using the Mandos protocol
1147
# Get protocol number
1148
line = self.request.makefile().readline()
1149
logger.debug(u"Protocol version: %r", line)
1150
try:
1151
if int(line.strip().split()[0]) > 1:
1152
raise RuntimeError
1153
except (ValueError, IndexError, RuntimeError), error:
1154
logger.error(u"Unknown protocol version: %s", error)
1155
return
1156
1157
# Start GnuTLS connection
1158
try:
1159
session.handshake()
1160
except gnutls.errors.GNUTLSError, error:
1161
logger.warning(u"Handshake failed: %s", error)
1162
# Do not run session.bye() here: the session is not
1163
# established. Just abandon the request.
1164
return
1165
logger.debug(u"Handshake succeeded")
1166
1167
approval_required = False
1168
try:
1169
try:
1170
fpr = self.fingerprint(self.peer_certificate
1171
(session))
1172
except (TypeError, gnutls.errors.GNUTLSError), error:
1173
logger.warning(u"Bad certificate: %s", error)
1174
return
1175
logger.debug(u"Fingerprint: %s", fpr)
1176
1177
try:
1178
client = ProxyClient(child_pipe, fpr,
1179
self.client_address)
1180
except KeyError:
1181
return
1182
1183
if client.approved_delay:
1184
delay = client.approved_delay
1185
client.approvals_pending += 1
1186
approval_required = True
1187
1188
while True:
1189
if not client.enabled:
1190
logger.warning(u"Client %s is disabled",
1191
client.name)
1192
if self.server.use_dbus:
1193
# Emit D-Bus signal
1194
client.Rejected("Disabled")
1195
return
1196
1197
if client._approved or not client.approved_delay:
1198
#We are approved or approval is disabled
1199
break
1200
elif client._approved is None:
1201
logger.info(u"Client %s need approval",
1202
client.name)
1203
if self.server.use_dbus:
1204
# Emit D-Bus signal
1205
client.NeedApproval(
1206
client.approved_delay_milliseconds(),
1207
client.approved_by_default)
1208
else:
1209
logger.warning(u"Client %s was not approved",
1210
client.name)
1211
if self.server.use_dbus:
1212
# Emit D-Bus signal
1213
client.Rejected("Disapproved")
1214
return
1215
1216
#wait until timeout or approved
1217
#x = float(client._timedelta_to_milliseconds(delay))
1218
time = datetime.datetime.now()
1219
client.changedstate.acquire()
1220
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1221
client.changedstate.release()
1222
time2 = datetime.datetime.now()
1223
if (time2 - time) >= delay:
1224
if not client.approved_by_default:
1225
logger.warning("Client %s timed out while"
1226
" waiting for approval",
1227
client.name)
1228
if self.server.use_dbus:
1229
# Emit D-Bus signal
1230
client.Rejected("Approval timed out")
1231
return
1232
else:
1233
break
1234
else:
1235
delay -= time2 - time
1236
1237
sent_size = 0
1238
while sent_size < len(client.secret):
1239
try:
1240
sent = session.send(client.secret[sent_size:])
1241
except (gnutls.errors.GNUTLSError), error:
1242
logger.warning("gnutls send failed")
1243
return
1244
logger.debug(u"Sent: %d, remaining: %d",
1245
sent, len(client.secret)
1246
- (sent_size + sent))
1247
sent_size += sent
1248
1249
logger.info(u"Sending secret to %s", client.name)
1250
# bump the timeout as if seen
1251
client.checked_ok()
1252
if self.server.use_dbus:
1253
# Emit D-Bus signal
1254
client.GotSecret()
1255
1256
finally:
1257
if approval_required:
1258
client.approvals_pending -= 1
1259
try:
1260
session.bye()
1261
except (gnutls.errors.GNUTLSError), error:
1262
logger.warning("gnutls bye failed")
1263
1264
@staticmethod
1265
def peer_certificate(session):
1266
"Return the peer's OpenPGP certificate as a bytestring"
1267
# If not an OpenPGP certificate...
1268
if (gnutls.library.functions
1269
.gnutls_certificate_type_get(session._c_object)
1270
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1271
# ...do the normal thing
1272
return session.peer_certificate
1273
list_size = ctypes.c_uint(1)
1274
cert_list = (gnutls.library.functions
1275
.gnutls_certificate_get_peers
1276
(session._c_object, ctypes.byref(list_size)))
1277
if not bool(cert_list) and list_size.value != 0:
1278
raise gnutls.errors.GNUTLSError(u"error getting peer"
1279
u" certificate")
1280
if list_size.value == 0:
1281
return None
1282
cert = cert_list[0]
1283
return ctypes.string_at(cert.data, cert.size)
1284
1285
@staticmethod
1286
def fingerprint(openpgp):
1287
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1288
# New GnuTLS "datum" with the OpenPGP public key
1289
datum = (gnutls.library.types
1290
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1291
ctypes.POINTER
1292
(ctypes.c_ubyte)),
1293
ctypes.c_uint(len(openpgp))))
1294
# New empty GnuTLS certificate
1295
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1296
(gnutls.library.functions
1297
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1298
# Import the OpenPGP public key into the certificate
1299
(gnutls.library.functions
1300
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1301
gnutls.library.constants
1302
.GNUTLS_OPENPGP_FMT_RAW))
1303
# Verify the self signature in the key
1304
crtverify = ctypes.c_uint()
1305
(gnutls.library.functions
1306
.gnutls_openpgp_crt_verify_self(crt, 0,
1307
ctypes.byref(crtverify)))
1308
if crtverify.value != 0:
1309
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1310
raise (gnutls.errors.CertificateSecurityError
1311
(u"Verify failed"))
1312
# New buffer for the fingerprint
1313
buf = ctypes.create_string_buffer(20)
1314
buf_len = ctypes.c_size_t()
1315
# Get the fingerprint from the certificate into the buffer
1316
(gnutls.library.functions
1317
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1318
ctypes.byref(buf_len)))
1319
# Deinit the certificate
1320
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1321
# Convert the buffer to a Python bytestring
1322
fpr = ctypes.string_at(buf, buf_len.value)
1323
# Convert the bytestring to hexadecimal notation
1324
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1325
return hex_fpr
1326
1327
1328
class MultiprocessingMixIn(object):
1329
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1330
def sub_process_main(self, request, address):
1331
try:
1332
self.finish_request(request, address)
1333
except:
1334
self.handle_error(request, address)
1335
self.close_request(request)
1336
1337
def process_request(self, request, address):
1338
"""Start a new process to process the request."""
1339
multiprocessing.Process(target = self.sub_process_main,
1340
args = (request, address)).start()
1341
1342
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1343
""" adds a pipe to the MixIn """
1344
def process_request(self, request, client_address):
1345
"""Overrides and wraps the original process_request().
1346
1347
This function creates a new pipe in self.pipe
1348
"""
1349
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1350
1351
super(MultiprocessingMixInWithPipe,
1352
self).process_request(request, client_address)
1353
self.child_pipe.close()
1354
self.add_pipe(parent_pipe)
1355
1356
def add_pipe(self, parent_pipe):
1357
"""Dummy function; override as necessary"""
1358
pass
1359
1360
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1361
socketserver.TCPServer, object):
1362
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1363
310
logger.debug(u"TCP connection from: %s",
311
unicode(self.client_address))
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
315
316
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
317
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
318
# "+DHE-DSS"))
319
priority = "SECURE256"
320
321
gnutls.library.functions.gnutls_priority_set_direct\
322
(session._c_object, priority, None);
323
324
try:
325
session.handshake()
326
except gnutls.errors.GNUTLSError, error:
327
logger.debug(u"Handshake failed: %s", error)
328
# Do not run session.bye() here: the session is not
329
# established. Just abandon the request.
330
return
331
try:
332
fpr = fingerprint(peer_certificate(session))
333
except (TypeError, gnutls.errors.GNUTLSError), error:
334
logger.debug(u"Bad certificate: %s", error)
335
session.bye()
336
return
337
logger.debug(u"Fingerprint: %s", fpr)
338
client = None
339
for c in clients:
340
if c.fingerprint == fpr:
341
client = c
342
break
343
# Have to check if client.still_valid(), since it is possible
344
# that the client timed out while establishing the GnuTLS
345
# session.
346
if (not client) or (not client.still_valid()):
347
if client:
348
logger.debug(u"Client %(name)s is invalid",
349
vars(client))
350
else:
351
logger.debug(u"Client not found for fingerprint: %s",
352
fpr)
353
session.bye()
354
return
355
sent_size = 0
356
while sent_size < len(client.secret):
357
sent = session.send(client.secret[sent_size:])
358
logger.debug(u"Sent: %d, remaining: %d",
359
sent, len(client.secret)
360
- (sent_size + sent))
361
sent_size += sent
362
session.bye()
363
364
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1364
367
Attributes:
1365
enabled: Boolean; whether this server is activated yet
1366
interface: None or a network interface name (string)
1367
use_ipv6: Boolean; to use IPv6 or not
368
options: Command line options
369
clients: Set() of Client objects
1368
370
"""
1369
def __init__(self, server_address, RequestHandlerClass,
1370
interface=None, use_ipv6=True):
1371
self.interface = interface
1372
if use_ipv6:
1373
self.address_family = socket.AF_INET6
1374
socketserver.TCPServer.__init__(self, server_address,
1375
RequestHandlerClass)
371
address_family = socket.AF_INET6
372
def __init__(self, *args, **kwargs):
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
376
if "clients" in kwargs:
377
self.clients = kwargs["clients"]
378
del kwargs["clients"]
379
return super(type(self), self).__init__(*args, **kwargs)
1376
380
def server_bind(self):
1377
381
"""This overrides the normal server_bind() function
1378
382
to bind to an interface if one was specified, and also NOT to
1379
383
bind to an address or port if they were not specified."""
1380
if self.interface is not None:
1381
if SO_BINDTODEVICE is None:
1382
logger.error(u"SO_BINDTODEVICE does not exist;"
1383
u" cannot bind to interface %s",
1384
self.interface)
1385
else:
1386
try:
1387
self.socket.setsockopt(socket.SOL_SOCKET,
1388
SO_BINDTODEVICE,
1389
str(self.interface
1390
+ u'\0'))
1391
except socket.error, error:
1392
if error[0] == errno.EPERM:
1393
logger.error(u"No permission to"
1394
u" bind to interface %s",
1395
self.interface)
1396
elif error[0] == errno.ENOPROTOOPT:
1397
logger.error(u"SO_BINDTODEVICE not available;"
1398
u" cannot bind to interface %s",
1399
self.interface)
1400
else:
1401
raise
384
if self.options.interface:
385
if not hasattr(socket, "SO_BINDTODEVICE"):
386
# From /usr/include/asm-i486/socket.h
387
socket.SO_BINDTODEVICE = 25
388
try:
389
self.socket.setsockopt(socket.SOL_SOCKET,
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
392
except socket.error, error:
393
if error[0] == errno.EPERM:
394
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
397
else:
398
raise error
1402
399
# Only bind(2) the socket if we really need to.
1403
400
if self.server_address[0] or self.server_address[1]:
1404
401
if not self.server_address[0]:
1405
if self.address_family == socket.AF_INET6:
1406
any_address = u"::" # in6addr_any
1407
else:
1408
any_address = socket.INADDR_ANY
1409
self.server_address = (any_address,
402
in6addr_any = "::"
403
self.server_address = (in6addr_any,
1410
404
self.server_address[1])
1411
elif not self.server_address[1]:
405
elif self.server_address[1] is None:
1412
406
self.server_address = (self.server_address[0],
1413
407
0)
1414
# if self.interface:
1415
# self.server_address = (self.server_address[0],
1416
# 0, # port
1417
# 0, # flowinfo
1418
# if_nametoindex
1419
# (self.interface))
1420
return socketserver.TCPServer.server_bind(self)
1421
1422
1423
class MandosServer(IPv6_TCPServer):
1424
"""Mandos server.
1425
1426
Attributes:
1427
clients: set of Client objects
1428
gnutls_priority GnuTLS priority string
1429
use_dbus: Boolean; to emit D-Bus signals or not
1430
1431
Assumes a gobject.MainLoop event loop.
1432
"""
1433
def __init__(self, server_address, RequestHandlerClass,
1434
interface=None, use_ipv6=True, clients=None,
1435
gnutls_priority=None, use_dbus=True):
1436
self.enabled = False
1437
self.clients = clients
1438
if self.clients is None:
1439
self.clients = set()
1440
self.use_dbus = use_dbus
1441
self.gnutls_priority = gnutls_priority
1442
IPv6_TCPServer.__init__(self, server_address,
1443
RequestHandlerClass,
1444
interface = interface,
1445
use_ipv6 = use_ipv6)
1446
def server_activate(self):
1447
if self.enabled:
1448
return socketserver.TCPServer.server_activate(self)
1449
def enable(self):
1450
self.enabled = True
1451
def add_pipe(self, parent_pipe):
1452
# Call "handle_ipc" for both data and EOF events
1453
gobject.io_add_watch(parent_pipe.fileno(),
1454
gobject.IO_IN | gobject.IO_HUP,
1455
functools.partial(self.handle_ipc,
1456
parent_pipe = parent_pipe))
1457
1458
def handle_ipc(self, source, condition, parent_pipe=None,
1459
client_object=None):
1460
condition_names = {
1461
gobject.IO_IN: u"IN", # There is data to read.
1462
gobject.IO_OUT: u"OUT", # Data can be written (without
1463
# blocking).
1464
gobject.IO_PRI: u"PRI", # There is urgent data to read.
1465
gobject.IO_ERR: u"ERR", # Error condition.
1466
gobject.IO_HUP: u"HUP" # Hung up (the connection has been
1467
# broken, usually for pipes and
1468
# sockets).
1469
}
1470
conditions_string = ' | '.join(name
1471
for cond, name in
1472
condition_names.iteritems()
1473
if cond & condition)
1474
# error or the other end of multiprocessing.Pipe has closed
1475
if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1476
return False
1477
1478
# Read a request from the child
1479
request = parent_pipe.recv()
1480
command = request[0]
1481
1482
if command == 'init':
1483
fpr = request[1]
1484
address = request[2]
1485
1486
for c in self.clients:
1487
if c.fingerprint == fpr:
1488
client = c
1489
break
1490
else:
1491
logger.warning(u"Client not found for fingerprint: %s, ad"
1492
u"dress: %s", fpr, address)
1493
if self.use_dbus:
1494
# Emit D-Bus signal
1495
mandos_dbus_service.ClientNotFound(fpr, address)
1496
parent_pipe.send(False)
1497
return False
1498
1499
gobject.io_add_watch(parent_pipe.fileno(),
1500
gobject.IO_IN | gobject.IO_HUP,
1501
functools.partial(self.handle_ipc,
1502
parent_pipe = parent_pipe,
1503
client_object = client))
1504
parent_pipe.send(True)
1505
# remove the old hook in favor of the new above hook on same fileno
1506
return False
1507
if command == 'funcall':
1508
funcname = request[1]
1509
args = request[2]
1510
kwargs = request[3]
1511
1512
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1513
1514
if command == 'getattr':
1515
attrname = request[1]
1516
if callable(client_object.__getattribute__(attrname)):
1517
parent_pipe.send(('function',))
1518
else:
1519
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1520
1521
if command == 'setattr':
1522
attrname = request[1]
1523
value = request[2]
1524
setattr(client_object, attrname, value)
1525
1526
return True
408
return super(type(self), self).server_bind()
1527
409
1528
410
1529
411
def string_to_delta(interval):
1530
412
"""Parse a string and return a datetime.timedelta
1531
1532
>>> string_to_delta(u'7d')
413
414
>>> string_to_delta('7d')
1533
415
datetime.timedelta(7)
1534
>>> string_to_delta(u'60s')
416
>>> string_to_delta('60s')
1535
417
datetime.timedelta(0, 60)
1536
>>> string_to_delta(u'60m')
418
>>> string_to_delta('60m')
1537
419
datetime.timedelta(0, 3600)
1538
>>> string_to_delta(u'24h')
420
>>> string_to_delta('24h')
1539
421
datetime.timedelta(1)
1540
422
>>> string_to_delta(u'1w')
1541
423
datetime.timedelta(7)
1542
>>> string_to_delta(u'5m 30s')
1543
datetime.timedelta(0, 330)
1544
424
"""
1545
timevalue = datetime.timedelta(0)
1546
for s in interval.split():
1547
try:
1548
suffix = unicode(s[-1])
1549
value = int(s[:-1])
1550
if suffix == u"d":
1551
delta = datetime.timedelta(value)
1552
elif suffix == u"s":
1553
delta = datetime.timedelta(0, value)
1554
elif suffix == u"m":
1555
delta = datetime.timedelta(0, 0, 0, 0, value)
1556
elif suffix == u"h":
1557
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1558
elif suffix == u"w":
1559
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1560
else:
1561
raise ValueError(u"Unknown suffix %r" % suffix)
1562
except (ValueError, IndexError), e:
1563
raise ValueError(e.message)
1564
timevalue += delta
1565
return timevalue
425
try:
426
suffix=unicode(interval[-1])
427
value=int(interval[:-1])
428
if suffix == u"d":
429
delta = datetime.timedelta(value)
430
elif suffix == u"s":
431
delta = datetime.timedelta(0, value)
432
elif suffix == u"m":
433
delta = datetime.timedelta(0, 0, 0, 0, value)
434
elif suffix == u"h":
435
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
436
elif suffix == u"w":
437
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
438
else:
439
raise ValueError
440
except (ValueError, IndexError):
441
raise ValueError
442
return delta
443
444
445
def add_service():
446
"""From the Avahi server example code"""
447
global group, serviceName, serviceType, servicePort, serviceTXT, \
448
domain, host
449
if group is None:
450
group = dbus.Interface(
451
bus.get_object( avahi.DBUS_NAME,
452
server.EntryGroupNew()),
453
avahi.DBUS_INTERFACE_ENTRY_GROUP)
454
group.connect_to_signal('StateChanged',
455
entry_group_state_changed)
456
logger.debug(u"Adding service '%s' of type '%s' ...",
457
serviceName, serviceType)
458
459
group.AddService(
460
serviceInterface, # interface
461
avahi.PROTO_INET6, # protocol
462
dbus.UInt32(0), # flags
463
serviceName, serviceType,
464
domain, host,
465
dbus.UInt16(servicePort),
466
avahi.string_array_to_txt_array(serviceTXT))
467
group.Commit()
468
469
470
def remove_service():
471
"""From the Avahi server example code"""
472
global group
473
474
if not group is None:
475
group.Reset()
476
477
478
def server_state_changed(state):
479
"""From the Avahi server example code"""
480
if state == avahi.SERVER_COLLISION:
481
logger.warning(u"Server name collision")
482
remove_service()
483
elif state == avahi.SERVER_RUNNING:
484
add_service()
485
486
487
def entry_group_state_changed(state, error):
488
"""From the Avahi server example code"""
489
global serviceName, server, rename_count
490
491
logger.debug(u"state change: %i", state)
492
493
if state == avahi.ENTRY_GROUP_ESTABLISHED:
494
logger.debug(u"Service established.")
495
elif state == avahi.ENTRY_GROUP_COLLISION:
496
497
rename_count = rename_count - 1
498
if rename_count > 0:
499
name = server.GetAlternativeServiceName(name)
500
logger.warning(u"Service name collision, "
501
u"changing name to '%s' ...", name)
502
remove_service()
503
add_service()
504
505
else:
506
logger.error(u"No suitable service name found "
507
u"after %i retries, exiting.",
508
n_rename)
509
main_loop.quit()
510
elif state == avahi.ENTRY_GROUP_FAILURE:
511
logger.error(u"Error in group state changed %s",
512
unicode(error))
513
main_loop.quit()
514
return
1566
515
1567
516
1568
517
def if_nametoindex(interface):
1569
"""Call the C function if_nametoindex(), or equivalent
1570
1571
Note: This function cannot accept a unicode string."""
1572
global if_nametoindex
518
"""Call the C function if_nametoindex()"""
1573
519
try:
1574
if_nametoindex = (ctypes.cdll.LoadLibrary
1575
(ctypes.util.find_library(u"c"))
1576
.if_nametoindex)
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
return libc.if_nametoindex(interface)
1577
522
except (OSError, AttributeError):
1578
logger.warning(u"Doing if_nametoindex the hard way")
1579
def if_nametoindex(interface):
1580
"Get an interface index the hard way, i.e. using fcntl()"
1581
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1582
with contextlib.closing(socket.socket()) as s:
1583
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1584
struct.pack(str(u"16s16x"),
1585
interface))
1586
interface_index = struct.unpack(str(u"I"),
1587
ifreq[16:20])[0]
1588
return interface_index
1589
return if_nametoindex(interface)
1590
1591
1592
def daemon(nochdir = False, noclose = False):
1593
"""See daemon(3). Standard BSD Unix function.
1594
1595
This should really exist as os.daemon, but it doesn't (yet)."""
1596
if os.fork():
1597
sys.exit()
1598
os.setsid()
1599
if not nochdir:
1600
os.chdir(u"/")
1601
if os.fork():
1602
sys.exit()
1603
if not noclose:
1604
# Close all standard open file descriptors
1605
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1606
if not stat.S_ISCHR(os.fstat(null).st_mode):
1607
raise OSError(errno.ENODEV,
1608
u"%s not a character device"
1609
% os.path.devnull)
1610
os.dup2(null, sys.stdin.fileno())
1611
os.dup2(null, sys.stdout.fileno())
1612
os.dup2(null, sys.stderr.fileno())
1613
if null > 2:
1614
os.close(null)
1615
1616
1617
def main():
1618
1619
##################################################################
1620
# Parsing of options, both command line and config file
1621
1622
parser = optparse.OptionParser(version = "%%prog %s" % version)
1623
parser.add_option("-i", u"--interface", type=u"string",
1624
metavar="IF", help=u"Bind to interface IF")
1625
parser.add_option("-a", u"--address", type=u"string",
1626
help=u"Address to listen for requests on")
1627
parser.add_option("-p", u"--port", type=u"int",
1628
help=u"Port number to receive requests on")
1629
parser.add_option("--check", action=u"store_true",
1630
help=u"Run self-test")
1631
parser.add_option("--debug", action=u"store_true",
1632
help=u"Debug mode; run in foreground and log to"
1633
u" terminal")
1634
parser.add_option("--debuglevel", type=u"string", metavar="Level",
1635
help=u"Debug level for stdout output")
1636
parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1637
u" priority string (see GnuTLS documentation)")
1638
parser.add_option("--servicename", type=u"string",
1639
metavar=u"NAME", help=u"Zeroconf service name")
1640
parser.add_option("--configdir", type=u"string",
1641
default=u"/etc/mandos", metavar=u"DIR",
1642
help=u"Directory to search for configuration"
1643
u" files")
1644
parser.add_option("--no-dbus", action=u"store_false",
1645
dest=u"use_dbus", help=u"Do not provide D-Bus"
1646
u" system bus interface")
1647
parser.add_option("--no-ipv6", action=u"store_false",
1648
dest=u"use_ipv6", help=u"Do not use IPv6")
1649
options = parser.parse_args()[0]
523
if "struct" not in sys.modules:
524
import struct
525
if "fcntl" not in sys.modules:
526
import fcntl
527
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
528
s = socket.socket()
529
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
530
struct.pack("16s16x", interface))
531
s.close()
532
interface_index = struct.unpack("I", ifreq[16:20])[0]
533
return interface_index
534
535
536
if __name__ == '__main__':
537
parser = OptionParser()
538
parser.add_option("-i", "--interface", type="string",
539
default=None, metavar="IF",
540
help="Bind to interface IF")
541
parser.add_option("--cert", type="string", default="cert.pem",
542
metavar="FILE",
543
help="Public key certificate PEM file to use")
544
parser.add_option("--key", type="string", default="key.pem",
545
metavar="FILE",
546
help="Private key PEM file to use")
547
parser.add_option("--ca", type="string", default="ca.pem",
548
metavar="FILE",
549
help="Certificate Authority certificate PEM file to use")
550
parser.add_option("--crl", type="string", default="crl.pem",
551
metavar="FILE",
552
help="Certificate Revokation List PEM file to use")
553
parser.add_option("-p", "--port", type="int", default=None,
554
help="Port number to receive requests on")
555
parser.add_option("--timeout", type="string", # Parsed later
556
default="1h",
557
help="Amount of downtime allowed for clients")
558
parser.add_option("--interval", type="string", # Parsed later
559
default="5m",
560
help="How often to check that a client is up")
561
parser.add_option("--check", action="store_true", default=False,
562
help="Run self-test")
563
parser.add_option("--debug", action="store_true", default=False,
564
help="Debug mode")
565
(options, args) = parser.parse_args()
1650
566
1651
567
if options.check:
1652
568
import doctest
1653
569
doctest.testmod()
1654
570
sys.exit()
1655
571
1656
# Default values for config file for server-global settings
1657
server_defaults = { u"interface": u"",
1658
u"address": u"",
1659
u"port": u"",
1660
u"debug": u"False",
1661
u"priority":
1662
u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1663
u"servicename": u"Mandos",
1664
u"use_dbus": u"True",
1665
u"use_ipv6": u"True",
1666
u"debuglevel": u"",
1667
}
1668
1669
# Parse config file for server-global settings
1670
server_config = configparser.SafeConfigParser(server_defaults)
1671
del server_defaults
1672
server_config.read(os.path.join(options.configdir,
1673
u"mandos.conf"))
1674
# Convert the SafeConfigParser object to a dict
1675
server_settings = server_config.defaults()
1676
# Use the appropriate methods on the non-string config options
1677
for option in (u"debug", u"use_dbus", u"use_ipv6"):
1678
server_settings[option] = server_config.getboolean(u"DEFAULT",
1679
option)
1680
if server_settings["port"]:
1681
server_settings["port"] = server_config.getint(u"DEFAULT",
1682
u"port")
1683
del server_config
1684
1685
# Override the settings from the config file with command line
1686
# options, if set.
1687
for option in (u"interface", u"address", u"port", u"debug",
1688
u"priority", u"servicename", u"configdir",
1689
u"use_dbus", u"use_ipv6", u"debuglevel"):
1690
value = getattr(options, option)
1691
if value is not None:
1692
server_settings[option] = value
1693
del options
1694
# Force all strings to be unicode
1695
for option in server_settings.keys():
1696
if type(server_settings[option]) is str:
1697
server_settings[option] = unicode(server_settings[option])
1698
# Now we have our good server settings in "server_settings"
1699
1700
##################################################################
1701
1702
# For convenience
1703
debug = server_settings[u"debug"]
1704
debuglevel = server_settings[u"debuglevel"]
1705
use_dbus = server_settings[u"use_dbus"]
1706
use_ipv6 = server_settings[u"use_ipv6"]
1707
1708
if server_settings[u"servicename"] != u"Mandos":
1709
syslogger.setFormatter(logging.Formatter
1710
(u'Mandos (%s) [%%(process)d]:'
1711
u' %%(levelname)s: %%(message)s'
1712
% server_settings[u"servicename"]))
1713
1714
# Parse config file with clients
1715
client_defaults = { u"timeout": u"1h",
1716
u"interval": u"5m",
1717
u"checker": u"fping -q -- %%(host)s",
1718
u"host": u"",
1719
u"approved_delay": u"0s",
1720
u"approved_duration": u"1s",
1721
}
1722
client_config = configparser.SafeConfigParser(client_defaults)
1723
client_config.read(os.path.join(server_settings[u"configdir"],
1724
u"clients.conf"))
1725
1726
global mandos_dbus_service
1727
mandos_dbus_service = None
1728
1729
tcp_server = MandosServer((server_settings[u"address"],
1730
server_settings[u"port"]),
1731
ClientHandler,
1732
interface=(server_settings[u"interface"]
1733
or None),
1734
use_ipv6=use_ipv6,
1735
gnutls_priority=
1736
server_settings[u"priority"],
1737
use_dbus=use_dbus)
1738
pidfilename = u"/var/run/mandos.pid"
1739
try:
1740
pidfile = open(pidfilename, u"w")
1741
except IOError:
1742
logger.error(u"Could not open file %r", pidfilename)
1743
1744
try:
1745
uid = pwd.getpwnam(u"_mandos").pw_uid
1746
gid = pwd.getpwnam(u"_mandos").pw_gid
1747
except KeyError:
1748
try:
1749
uid = pwd.getpwnam(u"mandos").pw_uid
1750
gid = pwd.getpwnam(u"mandos").pw_gid
1751
except KeyError:
1752
try:
1753
uid = pwd.getpwnam(u"nobody").pw_uid
1754
gid = pwd.getpwnam(u"nobody").pw_gid
1755
except KeyError:
1756
uid = 65534
1757
gid = 65534
1758
try:
1759
os.setgid(gid)
1760
os.setuid(uid)
1761
except OSError, error:
1762
if error[0] != errno.EPERM:
1763
raise error
1764
1765
# Enable all possible GnuTLS debugging
1766
1767
1768
if not debug and not debuglevel:
1769
syslogger.setLevel(logging.WARNING)
1770
console.setLevel(logging.WARNING)
1771
if debuglevel:
1772
level = getattr(logging, debuglevel.upper())
1773
syslogger.setLevel(level)
1774
console.setLevel(level)
1775
1776
if debug:
1777
# "Use a log level over 10 to enable all debugging options."
1778
# - GnuTLS manual
1779
gnutls.library.functions.gnutls_global_set_log_level(11)
1780
1781
@gnutls.library.types.gnutls_log_func
1782
def debug_gnutls(level, string):
1783
logger.debug(u"GnuTLS: %s", string[:-1])
1784
1785
(gnutls.library.functions
1786
.gnutls_global_set_log_function(debug_gnutls))
1787
1788
# Redirect stdin so all checkers get /dev/null
1789
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1790
os.dup2(null, sys.stdin.fileno())
1791
if null > 2:
1792
os.close(null)
1793
else:
1794
# No console logging
1795
logger.removeHandler(console)
1796
1797
1798
global main_loop
1799
# From the Avahi example code
572
# Parse the time arguments
573
try:
574
options.timeout = string_to_delta(options.timeout)
575
except ValueError:
576
parser.error("option --timeout: Unparseable time")
577
try:
578
options.interval = string_to_delta(options.interval)
579
except ValueError:
580
parser.error("option --interval: Unparseable time")
581
582
# Parse config file
583
defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
584
client_config = ConfigParser.SafeConfigParser(defaults)
585
#client_config.readfp(open("secrets.conf"), "secrets.conf")
586
client_config.read("mandos-clients.conf")
587
588
# From the Avahi server example code
1800
589
DBusGMainLoop(set_as_default=True )
1801
590
main_loop = gobject.MainLoop()
1802
591
bus = dbus.SystemBus()
1803
# End of Avahi example code
1804
if use_dbus:
1805
try:
1806
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
1807
bus, do_not_queue=True)
1808
except dbus.exceptions.NameExistsException, e:
1809
logger.error(unicode(e) + u", disabling D-Bus")
1810
use_dbus = False
1811
server_settings[u"use_dbus"] = False
1812
tcp_server.use_dbus = False
1813
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1814
service = AvahiService(name = server_settings[u"servicename"],
1815
servicetype = u"_mandos._tcp",
1816
protocol = protocol, bus = bus)
1817
if server_settings["interface"]:
1818
service.interface = (if_nametoindex
1819
(str(server_settings[u"interface"])))
1820
1821
if not debug:
1822
# Close all input and output, do double fork, etc.
1823
daemon()
1824
1825
global multiprocessing_manager
1826
multiprocessing_manager = multiprocessing.Manager()
1827
1828
client_class = Client
1829
if use_dbus:
1830
client_class = functools.partial(ClientDBus, bus = bus)
1831
def client_config_items(config, section):
1832
special_settings = {
1833
"approved_by_default":
1834
lambda: config.getboolean(section,
1835
"approved_by_default"),
1836
}
1837
for name, value in config.items(section):
1838
try:
1839
yield (name, special_settings[name]())
1840
except KeyError:
1841
yield (name, value)
1842
1843
tcp_server.clients.update(set(
1844
client_class(name = section,
1845
config= dict(client_config_items(
1846
client_config, section)))
1847
for section in client_config.sections()))
1848
if not tcp_server.clients:
1849
logger.warning(u"No clients defined")
1850
1851
try:
1852
with pidfile:
1853
pid = os.getpid()
1854
pidfile.write(str(pid) + "\n")
1855
del pidfile
1856
except IOError:
1857
logger.error(u"Could not write to file %r with PID %d",
1858
pidfilename, pid)
1859
except NameError:
1860
# "pidfile" was never created
1861
pass
1862
del pidfilename
1863
1864
if not debug:
1865
signal.signal(signal.SIGINT, signal.SIG_IGN)
1866
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1867
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1868
1869
if use_dbus:
1870
class MandosDBusService(dbus.service.Object):
1871
"""A D-Bus proxy object"""
1872
def __init__(self):
1873
dbus.service.Object.__init__(self, bus, u"/")
1874
_interface = u"se.bsnet.fukt.Mandos"
1875
1876
@dbus.service.signal(_interface, signature=u"o")
1877
def ClientAdded(self, objpath):
1878
"D-Bus signal"
1879
pass
1880
1881
@dbus.service.signal(_interface, signature=u"ss")
1882
def ClientNotFound(self, fingerprint, address):
1883
"D-Bus signal"
1884
pass
1885
1886
@dbus.service.signal(_interface, signature=u"os")
1887
def ClientRemoved(self, objpath, name):
1888
"D-Bus signal"
1889
pass
1890
1891
@dbus.service.method(_interface, out_signature=u"ao")
1892
def GetAllClients(self):
1893
"D-Bus method"
1894
return dbus.Array(c.dbus_object_path
1895
for c in tcp_server.clients)
1896
1897
@dbus.service.method(_interface,
1898
out_signature=u"a{oa{sv}}")
1899
def GetAllClientsWithProperties(self):
1900
"D-Bus method"
1901
return dbus.Dictionary(
1902
((c.dbus_object_path, c.GetAll(u""))
1903
for c in tcp_server.clients),
1904
signature=u"oa{sv}")
1905
1906
@dbus.service.method(_interface, in_signature=u"o")
1907
def RemoveClient(self, object_path):
1908
"D-Bus method"
1909
for c in tcp_server.clients:
1910
if c.dbus_object_path == object_path:
1911
tcp_server.clients.remove(c)
1912
c.remove_from_connection()
1913
# Don't signal anything except ClientRemoved
1914
c.disable(quiet=True)
1915
# Emit D-Bus signal
1916
self.ClientRemoved(object_path, c.name)
1917
return
1918
raise KeyError(object_path)
1919
1920
del _interface
1921
1922
mandos_dbus_service = MandosDBusService()
1923
1924
def cleanup():
1925
"Cleanup function; run on exit"
1926
service.cleanup()
1927
1928
while tcp_server.clients:
1929
client = tcp_server.clients.pop()
1930
if use_dbus:
1931
client.remove_from_connection()
1932
client.disable_hook = None
1933
# Don't signal anything except ClientRemoved
1934
client.disable(quiet=True)
1935
if use_dbus:
1936
# Emit D-Bus signal
1937
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1938
client.name)
1939
1940
atexit.register(cleanup)
1941
1942
for client in tcp_server.clients:
1943
if use_dbus:
1944
# Emit D-Bus signal
1945
mandos_dbus_service.ClientAdded(client.dbus_object_path)
1946
client.enable()
1947
1948
tcp_server.enable()
1949
tcp_server.server_activate()
1950
1951
# Find out what port we got
1952
service.port = tcp_server.socket.getsockname()[1]
1953
if use_ipv6:
1954
logger.info(u"Now listening on address %r, port %d,"
1955
" flowinfo %d, scope_id %d"
1956
% tcp_server.socket.getsockname())
1957
else: # IPv4
1958
logger.info(u"Now listening on address %r, port %d"
1959
% tcp_server.socket.getsockname())
1960
1961
#service.interface = tcp_server.socket.getsockname()[3]
1962
1963
try:
1964
# From the Avahi example code
1965
try:
1966
service.activate()
1967
except dbus.exceptions.DBusException, error:
1968
logger.critical(u"DBusException: %s", error)
1969
cleanup()
1970
sys.exit(1)
1971
# End of Avahi example code
1972
1973
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1974
lambda *args, **kwargs:
1975
(tcp_server.handle_request
1976
(*args[2:], **kwargs) or True))
1977
1978
logger.debug(u"Starting main loop")
592
server = dbus.Interface(
593
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
594
avahi.DBUS_INTERFACE_SERVER )
595
# End of Avahi example code
596
597
debug = options.debug
598
599
clients = Set()
600
def remove_from_clients(client):
601
clients.remove(client)
602
if not clients:
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
605
606
clients.update(Set(Client(name=section, options=options,
607
stop_hook = remove_from_clients,
608
**(dict(client_config\
609
.items(section))))
610
for section in client_config.sections()))
611
for client in clients:
612
client.start()
613
614
tcp_server = IPv6_TCPServer((None, options.port),
615
tcp_handler,
616
options=options,
617
clients=clients)
618
# Find out what random port we got
619
servicePort = tcp_server.socket.getsockname()[1]
620
logger.debug(u"Now listening on port %d", servicePort)
621
622
if options.interface is not None:
623
serviceInterface = if_nametoindex(options.interface)
624
625
# From the Avahi server example code
626
server.connect_to_signal("StateChanged", server_state_changed)
627
server_state_changed(server.GetState())
628
# End of Avahi example code
629
630
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
631
lambda *args, **kwargs:
632
tcp_server.handle_request(*args[2:],
633
**kwargs) or True)
634
try:
1979
635
main_loop.run()
1980
except AvahiError, error:
1981
logger.critical(u"AvahiError: %s", error)
1982
cleanup()
1983
sys.exit(1)
1984
636
except KeyboardInterrupt:
1985
if debug:
1986
print >> sys.stderr
1987
logger.debug(u"Server received KeyboardInterrupt")
1988
logger.debug(u"Server exiting")
1989
# Must run before the D-Bus bus name gets deregistered
1990
cleanup()
637
print
638
639
# Cleanup here
1991
640
1992
if __name__ == '__main__':
1993
main()
641
# From the Avahi server example code
642
if not group is None:
643
group.Free()
644
# End of Avahi example code
645
646
for client in clients:
647
client.stop_hook = None
648
client.stop()
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