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- Committer: Teddy Hogeborn
- Date: 2008-06-21 00:53:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20080621005332-s4scjdpevuso4lsd
* server.py: Bug fix: Do "from __future__ import division".
(Client.__init__): Bug fix: parse interval string from config file.
(Client.check_action): Take no arguments. Print some debugging
output. Reset "checker" to None.
(Client.start_checker): Sleep 10 seconds before pinging to alleviate
debugging.
(Client.next_stop): Bug fix: check if "last_seen" and/or "checker"
is None.
(Client.still_valid): Bug fix: check if "last_seen" is None.
(Client.handle): When finding the right password to send, use a list
comprehension and an index lookup instead of a generator expression to
a dict.
(IPv6_TCPServer.request_queue_size): Removed.
(in6addr_any): Moved inside "main".
(main): Changed "clients" to be a Set instead of a list. Bug fix:
Exit when/if all clients are removed. Call "select" with all client
checkers and a suitable timeout. Add some debugging output. Start
new checkers when needed and delete clients which have timed out.
(Client.__init__): Bug fix: parse interval string from config file.
(Client.check_action): Take no arguments. Print some debugging
output. Reset "checker" to None.
(Client.start_checker): Sleep 10 seconds before pinging to alleviate
debugging.
(Client.next_stop): Bug fix: check if "last_seen" and/or "checker"
is None.
(Client.still_valid): Bug fix: check if "last_seen" is None.
(Client.handle): When finding the right password to send, use a list
comprehension and an index lookup instead of a generator expression to
a dict.
(IPv6_TCPServer.request_queue_size): Removed.
(in6addr_any): Moved inside "main".
(main): Changed "clients" to be a Set instead of a list. Bug fix:
Exit when/if all clients are removed. Call "select" with all client
checkers and a suitable timeout. Add some debugging output. Start
new checkers when needed and delete clients which have timed out.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- plugins.d
- files renamed:
- clients.conf => mandos-clients.conf
- 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
42
12
import gnutls.connection
43
13
import gnutls.errors
44
import gnutls.library.functions
45
import gnutls.library.constants
46
import gnutls.library.types
47
import ConfigParser as configparser
14
import ConfigParser
48
15
import sys
49
16
import re
50
17
import os
51
18
import signal
19
from sets import Set
52
20
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
57
import pwd
58
from contextlib import closing
59
import struct
60
import fcntl
61
import functools
62
63
import dbus
64
import dbus.service
65
import gobject
66
import avahi
67
from dbus.mainloop.glib import DBusGMainLoop
68
import ctypes
69
import ctypes.util
70
71
try:
72
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
73
except AttributeError:
74
try:
75
from IN import SO_BINDTODEVICE
76
except ImportError:
77
SO_BINDTODEVICE = None
78
79
80
version = "1.0.10"
81
82
logger = logging.Logger(u'mandos')
83
syslogger = (logging.handlers.SysLogHandler
84
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
85
address = "/dev/log"))
86
syslogger.setFormatter(logging.Formatter
87
(u'Mandos [%(process)d]: %(levelname)s:'
88
u' %(message)s'))
89
logger.addHandler(syslogger)
90
91
console = logging.StreamHandler()
92
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
93
u' %(levelname)s:'
94
u' %(message)s'))
95
logger.addHandler(console)
96
97
class AvahiError(Exception):
98
def __init__(self, value, *args, **kwargs):
99
self.value = value
100
super(AvahiError, self).__init__(value, *args, **kwargs)
101
def __unicode__(self):
102
return unicode(repr(self.value))
103
104
class AvahiServiceError(AvahiError):
105
pass
106
107
class AvahiGroupError(AvahiError):
108
pass
109
110
111
class AvahiService(object):
112
"""An Avahi (Zeroconf) service.
113
114
Attributes:
115
interface: integer; avahi.IF_UNSPEC or an interface index.
116
Used to optionally bind to the specified interface.
117
name: string; Example: u'Mandos'
118
type: string; Example: u'_mandos._tcp'.
119
See <http://www.dns-sd.org/ServiceTypes.html>
120
port: integer; what port to announce
121
TXT: list of strings; TXT record for the service
122
domain: string; Domain to publish on, default to .local if empty.
123
host: string; Host to publish records for, default is localhost
124
max_renames: integer; maximum number of renames
125
rename_count: integer; counter so we only rename after collisions
126
a sensible number of times
127
group: D-Bus Entry Group
128
server: D-Bus Server
129
bus: dbus.SystemBus()
130
"""
131
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
132
servicetype = None, port = None, TXT = None,
133
domain = u"", host = u"", max_renames = 32768,
134
protocol = avahi.PROTO_UNSPEC, bus = None):
135
self.interface = interface
136
self.name = name
137
self.type = servicetype
138
self.port = port
139
self.TXT = TXT if TXT is not None else []
140
self.domain = domain
141
self.host = host
142
self.rename_count = 0
143
self.max_renames = max_renames
144
self.protocol = protocol
145
self.group = None # our entry group
146
self.server = None
147
self.bus = bus
148
def rename(self):
149
"""Derived from the Avahi example code"""
150
if self.rename_count >= self.max_renames:
151
logger.critical(u"No suitable Zeroconf service name found"
152
u" after %i retries, exiting.",
153
self.rename_count)
154
raise AvahiServiceError(u"Too many renames")
155
self.name = self.server.GetAlternativeServiceName(self.name)
156
logger.info(u"Changing Zeroconf service name to %r ...",
157
unicode(self.name))
158
syslogger.setFormatter(logging.Formatter
159
(u'Mandos (%s) [%%(process)d]:'
160
u' %%(levelname)s: %%(message)s'
161
% self.name))
162
self.remove()
163
self.add()
164
self.rename_count += 1
165
def remove(self):
166
"""Derived from the Avahi example code"""
167
if self.group is not None:
168
self.group.Reset()
169
def add(self):
170
"""Derived from the Avahi example code"""
171
if self.group is None:
172
self.group = dbus.Interface(
173
self.bus.get_object(avahi.DBUS_NAME,
174
self.server.EntryGroupNew()),
175
avahi.DBUS_INTERFACE_ENTRY_GROUP)
176
self.group.connect_to_signal('StateChanged',
177
self.entry_group_state_changed)
178
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
179
self.name, self.type)
180
self.group.AddService(
181
self.interface,
182
self.protocol,
183
dbus.UInt32(0), # flags
184
self.name, self.type,
185
self.domain, self.host,
186
dbus.UInt16(self.port),
187
avahi.string_array_to_txt_array(self.TXT))
188
self.group.Commit()
189
def entry_group_state_changed(self, state, error):
190
"""Derived from the Avahi example code"""
191
logger.debug(u"Avahi state change: %i", state)
192
193
if state == avahi.ENTRY_GROUP_ESTABLISHED:
194
logger.debug(u"Zeroconf service established.")
195
elif state == avahi.ENTRY_GROUP_COLLISION:
196
logger.warning(u"Zeroconf service name collision.")
197
self.rename()
198
elif state == avahi.ENTRY_GROUP_FAILURE:
199
logger.critical(u"Avahi: Error in group state changed %s",
200
unicode(error))
201
raise AvahiGroupError(u"State changed: %s"
202
% unicode(error))
203
def cleanup(self):
204
"""Derived from the Avahi example code"""
205
if self.group is not None:
206
self.group.Free()
207
self.group = None
208
def server_state_changed(self, state):
209
"""Derived from the Avahi example code"""
210
if state == avahi.SERVER_COLLISION:
211
logger.error(u"Zeroconf server name collision")
212
self.remove()
213
elif state == avahi.SERVER_RUNNING:
214
self.add()
215
def activate(self):
216
"""Derived from the Avahi example code"""
217
if self.server is None:
218
self.server = dbus.Interface(
219
self.bus.get_object(avahi.DBUS_NAME,
220
avahi.DBUS_PATH_SERVER),
221
avahi.DBUS_INTERFACE_SERVER)
222
self.server.connect_to_signal(u"StateChanged",
223
self.server_state_changed)
224
self.server_state_changed(self.server.GetState())
225
226
21
227
22
class Client(object):
228
"""A representation of a client host served by this server.
229
230
Attributes:
231
name: string; from the config file, used in log messages and
232
D-Bus identifiers
233
fingerprint: string (40 or 32 hexadecimal digits); used to
234
uniquely identify the client
235
secret: bytestring; sent verbatim (over TLS) to client
236
host: string; available for use by the checker command
237
created: datetime.datetime(); (UTC) object creation
238
last_enabled: datetime.datetime(); (UTC)
239
enabled: bool()
240
last_checked_ok: datetime.datetime(); (UTC) or None
241
timeout: datetime.timedelta(); How long from last_checked_ok
242
until this client is invalid
243
interval: datetime.timedelta(); How often to start a new checker
244
disable_hook: If set, called by disable() as disable_hook(self)
245
checker: subprocess.Popen(); a running checker process used
246
to see if the client lives.
247
'None' if no process is running.
248
checker_initiator_tag: a gobject event source tag, or None
249
disable_initiator_tag: - '' -
250
checker_callback_tag: - '' -
251
checker_command: string; External command which is run to check if
252
client lives. %() expansions are done at
253
runtime with vars(self) as dict, so that for
254
instance %(name)s can be used in the command.
255
current_checker_command: string; current running checker_command
256
"""
257
258
@staticmethod
259
def _datetime_to_milliseconds(dt):
260
"Convert a datetime.datetime() to milliseconds"
261
return ((dt.days * 24 * 60 * 60 * 1000)
262
+ (dt.seconds * 1000)
263
+ (dt.microseconds // 1000))
264
265
def timeout_milliseconds(self):
266
"Return the 'timeout' attribute in milliseconds"
267
return self._datetime_to_milliseconds(self.timeout)
268
269
def interval_milliseconds(self):
270
"Return the 'interval' attribute in milliseconds"
271
return self._datetime_to_milliseconds(self.interval)
272
273
def __init__(self, name = None, disable_hook=None, config=None):
274
"""Note: the 'checker' key in 'config' sets the
275
'checker_command' attribute and *not* the 'checker'
276
attribute."""
23
def __init__(self, name=None, options=None, dn=None,
24
password=None, passfile=None, fqdn=None,
25
timeout=None, interval=-1):
277
26
self.name = name
278
if config is None:
279
config = {}
280
logger.debug(u"Creating client %r", self.name)
281
# Uppercase and remove spaces from fingerprint for later
282
# comparison purposes with return value from the fingerprint()
283
# function
284
self.fingerprint = (config[u"fingerprint"].upper()
285
.replace(u" ", u""))
286
logger.debug(u" Fingerprint: %s", self.fingerprint)
287
if u"secret" in config:
288
self.secret = config[u"secret"].decode(u"base64")
289
elif u"secfile" in config:
290
with closing(open(os.path.expanduser
291
(os.path.expandvars
292
(config[u"secfile"])))) as secfile:
293
self.secret = secfile.read()
294
else:
295
raise TypeError(u"No secret or secfile for client %s"
296
% self.name)
297
self.host = config.get(u"host", u"")
298
self.created = datetime.datetime.utcnow()
299
self.enabled = False
300
self.last_enabled = None
301
self.last_checked_ok = None
302
self.timeout = string_to_delta(config[u"timeout"])
303
self.interval = string_to_delta(config[u"interval"])
304
self.disable_hook = disable_hook
305
self.checker = None
306
self.checker_initiator_tag = None
307
self.disable_initiator_tag = None
308
self.checker_callback_tag = None
309
self.checker_command = config[u"checker"]
310
self.current_checker_command = None
311
self.last_connect = None
312
313
def enable(self):
314
"""Start this client's checker and timeout hooks"""
315
if getattr(self, u"enabled", False):
316
# Already enabled
27
self.dn = dn
28
if password:
29
self.password = password
30
elif passfile:
31
self.password = open(passfile).readall()
32
else:
33
print "No Password or Passfile in client config file"
34
# raise RuntimeError XXX
35
self.password = "gazonk"
36
self.fqdn = fqdn # string
37
self.created = datetime.datetime.now()
38
self.last_seen = None # datetime.datetime()
39
if timeout is None:
40
timeout = options.timeout
41
self.timeout = timeout # datetime.timedelta()
42
if interval == -1:
43
interval = options.interval
44
else:
45
interval = string_to_delta(interval)
46
self.interval = interval # datetime.timedelta()
47
self.next_check = datetime.datetime.now() # datetime.datetime()
48
# Note: next_check may be in the past if checker is not None
49
self.checker = None # or a subprocess.Popen()
50
def check_action(self):
51
"""The checker said something and might have completed.
52
Check if is has, and take appropriate actions."""
53
if self.checker.poll() is None:
54
# False alarm, no result yet
55
#self.checker.read()
56
#print "Checker for %(name)s said nothing?" % vars(self)
317
57
return
318
self.last_enabled = datetime.datetime.utcnow()
319
# Schedule a new checker to be started an 'interval' from now,
320
# and every interval from then on.
321
self.checker_initiator_tag = (gobject.timeout_add
322
(self.interval_milliseconds(),
323
self.start_checker))
324
# Also start a new checker *right now*.
325
self.start_checker()
326
# Schedule a disable() when 'timeout' has passed
327
self.disable_initiator_tag = (gobject.timeout_add
328
(self.timeout_milliseconds(),
329
self.disable))
330
self.enabled = True
331
332
def disable(self):
333
"""Disable this client."""
334
if not getattr(self, "enabled", False):
335
return False
336
logger.info(u"Disabling client %s", self.name)
337
if getattr(self, u"disable_initiator_tag", False):
338
gobject.source_remove(self.disable_initiator_tag)
339
self.disable_initiator_tag = None
340
if getattr(self, u"checker_initiator_tag", False):
341
gobject.source_remove(self.checker_initiator_tag)
342
self.checker_initiator_tag = None
343
self.stop_checker()
344
if self.disable_hook:
345
self.disable_hook(self)
346
self.enabled = False
347
# Do not run this again if called by a gobject.timeout_add
348
return False
349
350
def __del__(self):
351
self.disable_hook = None
352
self.disable()
353
354
def checker_callback(self, pid, condition, command):
355
"""The checker has completed, so take appropriate actions."""
356
self.checker_callback_tag = None
58
now = datetime.datetime.now()
59
if self.checker.returncode == 0:
60
print "Checker for %(name)s succeeded" % vars(self)
61
self.last_seen = now
62
else:
63
print "Checker for %(name)s failed" % vars(self)
64
while self.next_check <= now:
65
self.next_check += self.interval
357
66
self.checker = None
358
if os.WIFEXITED(condition):
359
exitstatus = os.WEXITSTATUS(condition)
360
if exitstatus == 0:
361
logger.info(u"Checker for %(name)s succeeded",
362
vars(self))
363
self.checked_ok()
364
else:
365
logger.info(u"Checker for %(name)s failed",
366
vars(self))
367
else:
368
logger.warning(u"Checker for %(name)s crashed?",
369
vars(self))
370
371
def checked_ok(self):
372
"""Bump up the timeout for this client.
373
374
This should only be called when the client has been seen,
375
alive and well.
376
"""
377
self.last_checked_ok = datetime.datetime.utcnow()
378
gobject.source_remove(self.disable_initiator_tag)
379
self.disable_initiator_tag = (gobject.timeout_add
380
(self.timeout_milliseconds(),
381
self.disable))
382
67
handle_request = check_action
383
68
def start_checker(self):
384
"""Start a new checker subprocess if one is not running.
385
386
If a checker already exists, leave it running and do
387
nothing."""
388
# The reason for not killing a running checker is that if we
389
# did that, then if a checker (for some reason) started
390
# running slowly and taking more than 'interval' time, the
391
# client would inevitably timeout, since no checker would get
392
# a chance to run to completion. If we instead leave running
393
# checkers alone, the checker would have to take more time
394
# than 'timeout' for the client to be declared invalid, which
395
# is as it should be.
396
397
# If a checker exists, make sure it is not a zombie
398
if self.checker is not None:
399
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
400
if pid:
401
logger.warning(u"Checker was a zombie")
402
gobject.source_remove(self.checker_callback_tag)
403
self.checker_callback(pid, status,
404
self.current_checker_command)
405
# Start a new checker if needed
406
if self.checker is None:
407
try:
408
# In case checker_command has exactly one % operator
409
command = self.checker_command % self.host
410
except TypeError:
411
# Escape attributes for the shell
412
escaped_attrs = dict((key,
413
re.escape(unicode(str(val),
414
errors=
415
u'replace')))
416
for key, val in
417
vars(self).iteritems())
418
try:
419
command = self.checker_command % escaped_attrs
420
except TypeError, error:
421
logger.error(u'Could not format string "%s":'
422
u' %s', self.checker_command, error)
423
return True # Try again later
424
self.current_checker_command = command
425
try:
426
logger.info(u"Starting checker %r for %s",
427
command, self.name)
428
# We don't need to redirect stdout and stderr, since
429
# in normal mode, that is already done by daemon(),
430
# and in debug mode we don't want to. (Stdin is
431
# always replaced by /dev/null.)
432
self.checker = subprocess.Popen(command,
433
close_fds=True,
434
shell=True, cwd=u"/")
435
self.checker_callback_tag = (gobject.child_watch_add
436
(self.checker.pid,
437
self.checker_callback,
438
data=command))
439
# The checker may have completed before the gobject
440
# watch was added. Check for this.
441
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
442
if pid:
443
gobject.source_remove(self.checker_callback_tag)
444
self.checker_callback(pid, status, command)
445
except OSError, error:
446
logger.error(u"Failed to start subprocess: %s",
447
error)
448
# Re-run this periodically if run by gobject.timeout_add
449
return True
450
69
self.stop_checker()
70
try:
71
self.checker = subprocess.Popen("sleep 10; fping -q -- %s"
72
% re.escape(self.fqdn),
73
stdout=subprocess.PIPE,
74
close_fds=True,
75
shell=True, cwd="/")
76
except subprocess.OSError, e:
77
print "Failed to start subprocess:", e
451
78
def stop_checker(self):
452
"""Force the checker process, if any, to stop."""
453
if self.checker_callback_tag:
454
gobject.source_remove(self.checker_callback_tag)
455
self.checker_callback_tag = None
456
if getattr(self, u"checker", None) is None:
79
if self.checker is None:
457
80
return
458
logger.debug(u"Stopping checker for %(name)s", vars(self))
459
try:
460
os.kill(self.checker.pid, signal.SIGTERM)
461
#os.sleep(0.5)
462
#if self.checker.poll() is None:
463
# os.kill(self.checker.pid, signal.SIGKILL)
464
except OSError, error:
465
if error.errno != errno.ESRCH: # No such process
466
raise
81
os.kill(self.checker.pid, signal.SIGTERM)
82
if self.checker.poll() is None:
83
os.kill(self.checker.pid, signal.SIGKILL)
467
84
self.checker = None
468
469
def still_valid(self):
470
"""Has the timeout not yet passed for this client?"""
471
if not getattr(self, u"enabled", False):
472
return False
473
now = datetime.datetime.utcnow()
474
if self.last_checked_ok is None:
85
__del__ = stop_checker
86
def fileno(self):
87
if self.checker is None:
88
return None
89
return self.checker.stdout.fileno()
90
def next_stop(self):
91
"""The time when something must be done about this client
92
May be in the past."""
93
if self.last_seen is None:
94
# This client has never been seen
95
next_timeout = self.created + self.timeout
96
else:
97
next_timeout = self.last_seen + self.timeout
98
if self.checker is None:
99
return min(next_timeout, self.next_check)
100
else:
101
return next_timeout
102
def still_valid(self, now=None):
103
"""Has this client's timeout not passed?"""
104
if now is None:
105
now = datetime.datetime.now()
106
if self.last_seen is None:
475
107
return now < (self.created + self.timeout)
476
108
else:
477
return now < (self.last_checked_ok + self.timeout)
478
479
480
class ClientDBus(Client, dbus.service.Object):
481
"""A Client class using D-Bus
482
483
Attributes:
484
dbus_object_path: dbus.ObjectPath
485
bus: dbus.SystemBus()
486
"""
487
# dbus.service.Object doesn't use super(), so we can't either.
488
489
def __init__(self, bus = None, *args, **kwargs):
490
self.bus = bus
491
Client.__init__(self, *args, **kwargs)
492
# Only now, when this client is initialized, can it show up on
493
# the D-Bus
494
self.dbus_object_path = (dbus.ObjectPath
495
(u"/clients/"
496
+ self.name.replace(u".", u"_")))
497
dbus.service.Object.__init__(self, self.bus,
498
self.dbus_object_path)
499
500
@staticmethod
501
def _datetime_to_dbus(dt, variant_level=0):
502
"""Convert a UTC datetime.datetime() to a D-Bus type."""
503
return dbus.String(dt.isoformat(),
504
variant_level=variant_level)
505
506
def enable(self):
507
oldstate = getattr(self, u"enabled", False)
508
r = Client.enable(self)
509
if oldstate != self.enabled:
510
# Emit D-Bus signals
511
self.PropertyChanged(dbus.String(u"enabled"),
512
dbus.Boolean(True, variant_level=1))
513
self.PropertyChanged(
514
dbus.String(u"last_enabled"),
515
self._datetime_to_dbus(self.last_enabled,
516
variant_level=1))
517
return r
518
519
def disable(self, signal = True):
520
oldstate = getattr(self, u"enabled", False)
521
r = Client.disable(self)
522
if signal and oldstate != self.enabled:
523
# Emit D-Bus signal
524
self.PropertyChanged(dbus.String(u"enabled"),
525
dbus.Boolean(False, variant_level=1))
526
return r
527
528
def __del__(self, *args, **kwargs):
529
try:
530
self.remove_from_connection()
531
except LookupError:
532
pass
533
if hasattr(dbus.service.Object, u"__del__"):
534
dbus.service.Object.__del__(self, *args, **kwargs)
535
Client.__del__(self, *args, **kwargs)
536
537
def checker_callback(self, pid, condition, command,
538
*args, **kwargs):
539
self.checker_callback_tag = None
540
self.checker = None
541
# Emit D-Bus signal
542
self.PropertyChanged(dbus.String(u"checker_running"),
543
dbus.Boolean(False, variant_level=1))
544
if os.WIFEXITED(condition):
545
exitstatus = os.WEXITSTATUS(condition)
546
# Emit D-Bus signal
547
self.CheckerCompleted(dbus.Int16(exitstatus),
548
dbus.Int64(condition),
549
dbus.String(command))
550
else:
551
# Emit D-Bus signal
552
self.CheckerCompleted(dbus.Int16(-1),
553
dbus.Int64(condition),
554
dbus.String(command))
555
556
return Client.checker_callback(self, pid, condition, command,
557
*args, **kwargs)
558
559
def checked_ok(self, *args, **kwargs):
560
r = Client.checked_ok(self, *args, **kwargs)
561
# Emit D-Bus signal
562
self.PropertyChanged(
563
dbus.String(u"last_checked_ok"),
564
(self._datetime_to_dbus(self.last_checked_ok,
565
variant_level=1)))
566
return r
567
568
def start_checker(self, *args, **kwargs):
569
old_checker = self.checker
570
if self.checker is not None:
571
old_checker_pid = self.checker.pid
572
else:
573
old_checker_pid = None
574
r = Client.start_checker(self, *args, **kwargs)
575
# Only if new checker process was started
576
if (self.checker is not None
577
and old_checker_pid != self.checker.pid):
578
# Emit D-Bus signal
579
self.CheckerStarted(self.current_checker_command)
580
self.PropertyChanged(
581
dbus.String(u"checker_running"),
582
dbus.Boolean(True, variant_level=1))
583
return r
584
585
def stop_checker(self, *args, **kwargs):
586
old_checker = getattr(self, u"checker", None)
587
r = Client.stop_checker(self, *args, **kwargs)
588
if (old_checker is not None
589
and getattr(self, u"checker", None) is None):
590
self.PropertyChanged(dbus.String(u"checker_running"),
591
dbus.Boolean(False, variant_level=1))
592
return r
593
594
## D-Bus methods & signals
595
_interface = u"se.bsnet.fukt.Mandos.Client"
596
597
# CheckedOK - method
598
@dbus.service.method(_interface)
599
def CheckedOK(self):
600
return self.checked_ok()
601
602
# CheckerCompleted - signal
603
@dbus.service.signal(_interface, signature=u"nxs")
604
def CheckerCompleted(self, exitcode, waitstatus, command):
605
"D-Bus signal"
606
pass
607
608
# CheckerStarted - signal
609
@dbus.service.signal(_interface, signature=u"s")
610
def CheckerStarted(self, command):
611
"D-Bus signal"
612
pass
613
614
# GetAllProperties - method
615
@dbus.service.method(_interface, out_signature=u"a{sv}")
616
def GetAllProperties(self):
617
"D-Bus method"
618
return dbus.Dictionary({
619
dbus.String(u"name"):
620
dbus.String(self.name, variant_level=1),
621
dbus.String(u"fingerprint"):
622
dbus.String(self.fingerprint, variant_level=1),
623
dbus.String(u"host"):
624
dbus.String(self.host, variant_level=1),
625
dbus.String(u"created"):
626
self._datetime_to_dbus(self.created,
627
variant_level=1),
628
dbus.String(u"last_enabled"):
629
(self._datetime_to_dbus(self.last_enabled,
630
variant_level=1)
631
if self.last_enabled is not None
632
else dbus.Boolean(False, variant_level=1)),
633
dbus.String(u"enabled"):
634
dbus.Boolean(self.enabled, variant_level=1),
635
dbus.String(u"last_checked_ok"):
636
(self._datetime_to_dbus(self.last_checked_ok,
637
variant_level=1)
638
if self.last_checked_ok is not None
639
else dbus.Boolean (False, variant_level=1)),
640
dbus.String(u"timeout"):
641
dbus.UInt64(self.timeout_milliseconds(),
642
variant_level=1),
643
dbus.String(u"interval"):
644
dbus.UInt64(self.interval_milliseconds(),
645
variant_level=1),
646
dbus.String(u"checker"):
647
dbus.String(self.checker_command,
648
variant_level=1),
649
dbus.String(u"checker_running"):
650
dbus.Boolean(self.checker is not None,
651
variant_level=1),
652
dbus.String(u"object_path"):
653
dbus.ObjectPath(self.dbus_object_path,
654
variant_level=1)
655
}, signature=u"sv")
656
657
# IsStillValid - method
658
@dbus.service.method(_interface, out_signature=u"b")
659
def IsStillValid(self):
660
return self.still_valid()
661
662
# PropertyChanged - signal
663
@dbus.service.signal(_interface, signature=u"sv")
664
def PropertyChanged(self, property, value):
665
"D-Bus signal"
666
pass
667
668
# ReceivedSecret - signal
669
@dbus.service.signal(_interface)
670
def ReceivedSecret(self):
671
"D-Bus signal"
672
pass
673
674
# Rejected - signal
675
@dbus.service.signal(_interface)
676
def Rejected(self):
677
"D-Bus signal"
678
pass
679
680
# SetChecker - method
681
@dbus.service.method(_interface, in_signature=u"s")
682
def SetChecker(self, checker):
683
"D-Bus setter method"
684
self.checker_command = checker
685
# Emit D-Bus signal
686
self.PropertyChanged(dbus.String(u"checker"),
687
dbus.String(self.checker_command,
688
variant_level=1))
689
690
# SetHost - method
691
@dbus.service.method(_interface, in_signature=u"s")
692
def SetHost(self, host):
693
"D-Bus setter method"
694
self.host = host
695
# Emit D-Bus signal
696
self.PropertyChanged(dbus.String(u"host"),
697
dbus.String(self.host, variant_level=1))
698
699
# SetInterval - method
700
@dbus.service.method(_interface, in_signature=u"t")
701
def SetInterval(self, milliseconds):
702
self.interval = datetime.timedelta(0, 0, 0, milliseconds)
703
# Emit D-Bus signal
704
self.PropertyChanged(dbus.String(u"interval"),
705
(dbus.UInt64(self.interval_milliseconds(),
706
variant_level=1)))
707
708
# SetSecret - method
709
@dbus.service.method(_interface, in_signature=u"ay",
710
byte_arrays=True)
711
def SetSecret(self, secret):
712
"D-Bus setter method"
713
self.secret = str(secret)
714
715
# SetTimeout - method
716
@dbus.service.method(_interface, in_signature=u"t")
717
def SetTimeout(self, milliseconds):
718
self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
719
# Emit D-Bus signal
720
self.PropertyChanged(dbus.String(u"timeout"),
721
(dbus.UInt64(self.timeout_milliseconds(),
722
variant_level=1)))
723
724
# Enable - method
725
@dbus.service.method(_interface)
726
def Enable(self):
727
"D-Bus method"
728
self.enable()
729
730
# StartChecker - method
731
@dbus.service.method(_interface)
732
def StartChecker(self):
733
"D-Bus method"
734
self.start_checker()
735
736
# Disable - method
737
@dbus.service.method(_interface)
738
def Disable(self):
739
"D-Bus method"
740
self.disable()
741
742
# StopChecker - method
743
@dbus.service.method(_interface)
744
def StopChecker(self):
745
self.stop_checker()
746
747
del _interface
748
749
750
class ClientHandler(socketserver.BaseRequestHandler, object):
751
"""A class to handle client connections.
752
753
Instantiated once for each connection to handle it.
754
Note: This will run in its own forked process."""
755
756
def handle(self):
757
logger.info(u"TCP connection from: %s",
758
unicode(self.client_address))
759
logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
760
# Open IPC pipe to parent process
761
with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
762
session = (gnutls.connection
763
.ClientSession(self.request,
764
gnutls.connection
765
.X509Credentials()))
766
767
line = self.request.makefile().readline()
768
logger.debug(u"Protocol version: %r", line)
769
try:
770
if int(line.strip().split()[0]) > 1:
771
raise RuntimeError
772
except (ValueError, IndexError, RuntimeError), error:
773
logger.error(u"Unknown protocol version: %s", error)
774
return
775
776
# Note: gnutls.connection.X509Credentials is really a
777
# generic GnuTLS certificate credentials object so long as
778
# no X.509 keys are added to it. Therefore, we can use it
779
# here despite using OpenPGP certificates.
780
781
#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
782
# u"+AES-256-CBC", u"+SHA1",
783
# u"+COMP-NULL", u"+CTYPE-OPENPGP",
784
# u"+DHE-DSS"))
785
# Use a fallback default, since this MUST be set.
786
priority = self.server.gnutls_priority
787
if priority is None:
788
priority = u"NORMAL"
789
(gnutls.library.functions
790
.gnutls_priority_set_direct(session._c_object,
791
priority, None))
792
793
try:
794
session.handshake()
795
except gnutls.errors.GNUTLSError, error:
796
logger.warning(u"Handshake failed: %s", error)
797
# Do not run session.bye() here: the session is not
798
# established. Just abandon the request.
799
return
800
logger.debug(u"Handshake succeeded")
801
try:
802
fpr = self.fingerprint(self.peer_certificate(session))
803
except (TypeError, gnutls.errors.GNUTLSError), error:
804
logger.warning(u"Bad certificate: %s", error)
805
session.bye()
806
return
807
logger.debug(u"Fingerprint: %s", fpr)
808
809
for c in self.server.clients:
810
if c.fingerprint == fpr:
811
client = c
812
break
813
else:
814
ipc.write(u"NOTFOUND %s\n" % fpr)
815
session.bye()
816
return
817
# Have to check if client.still_valid(), since it is
818
# possible that the client timed out while establishing
819
# the GnuTLS session.
820
if not client.still_valid():
821
ipc.write(u"INVALID %s\n" % client.name)
822
session.bye()
823
return
824
ipc.write(u"SENDING %s\n" % client.name)
825
sent_size = 0
826
while sent_size < len(client.secret):
827
sent = session.send(client.secret[sent_size:])
828
logger.debug(u"Sent: %d, remaining: %d",
829
sent, len(client.secret)
830
- (sent_size + sent))
831
sent_size += sent
832
session.bye()
833
834
@staticmethod
835
def peer_certificate(session):
836
"Return the peer's OpenPGP certificate as a bytestring"
837
# If not an OpenPGP certificate...
838
if (gnutls.library.functions
839
.gnutls_certificate_type_get(session._c_object)
840
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
841
# ...do the normal thing
842
return session.peer_certificate
843
list_size = ctypes.c_uint(1)
844
cert_list = (gnutls.library.functions
845
.gnutls_certificate_get_peers
846
(session._c_object, ctypes.byref(list_size)))
847
if not bool(cert_list) and list_size.value != 0:
848
raise gnutls.errors.GNUTLSError(u"error getting peer"
849
u" certificate")
850
if list_size.value == 0:
851
return None
852
cert = cert_list[0]
853
return ctypes.string_at(cert.data, cert.size)
854
855
@staticmethod
856
def fingerprint(openpgp):
857
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
858
# New GnuTLS "datum" with the OpenPGP public key
859
datum = (gnutls.library.types
860
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
861
ctypes.POINTER
862
(ctypes.c_ubyte)),
863
ctypes.c_uint(len(openpgp))))
864
# New empty GnuTLS certificate
865
crt = gnutls.library.types.gnutls_openpgp_crt_t()
866
(gnutls.library.functions
867
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
868
# Import the OpenPGP public key into the certificate
869
(gnutls.library.functions
870
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
871
gnutls.library.constants
872
.GNUTLS_OPENPGP_FMT_RAW))
873
# Verify the self signature in the key
874
crtverify = ctypes.c_uint()
875
(gnutls.library.functions
876
.gnutls_openpgp_crt_verify_self(crt, 0,
877
ctypes.byref(crtverify)))
878
if crtverify.value != 0:
879
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
880
raise (gnutls.errors.CertificateSecurityError
881
(u"Verify failed"))
882
# New buffer for the fingerprint
883
buf = ctypes.create_string_buffer(20)
884
buf_len = ctypes.c_size_t()
885
# Get the fingerprint from the certificate into the buffer
886
(gnutls.library.functions
887
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
888
ctypes.byref(buf_len)))
889
# Deinit the certificate
890
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
891
# Convert the buffer to a Python bytestring
892
fpr = ctypes.string_at(buf, buf_len.value)
893
# Convert the bytestring to hexadecimal notation
894
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
895
return hex_fpr
896
897
898
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
899
"""Like socketserver.ForkingMixIn, but also pass a pipe."""
900
def process_request(self, request, client_address):
901
"""Overrides and wraps the original process_request().
902
903
This function creates a new pipe in self.pipe
904
"""
905
self.pipe = os.pipe()
906
super(ForkingMixInWithPipe,
907
self).process_request(request, client_address)
908
os.close(self.pipe[1]) # close write end
909
self.add_pipe(self.pipe[0])
910
def add_pipe(self, pipe):
911
"""Dummy function; override as necessary"""
912
os.close(pipe)
913
914
915
class IPv6_TCPServer(ForkingMixInWithPipe,
916
socketserver.TCPServer, object):
917
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
918
919
Attributes:
920
enabled: Boolean; whether this server is activated yet
921
interface: None or a network interface name (string)
922
use_ipv6: Boolean; to use IPv6 or not
923
"""
924
def __init__(self, server_address, RequestHandlerClass,
925
interface=None, use_ipv6=True):
926
self.interface = interface
927
if use_ipv6:
928
self.address_family = socket.AF_INET6
929
socketserver.TCPServer.__init__(self, server_address,
930
RequestHandlerClass)
931
def server_bind(self):
932
"""This overrides the normal server_bind() function
933
to bind to an interface if one was specified, and also NOT to
934
bind to an address or port if they were not specified."""
935
if self.interface is not None:
936
if SO_BINDTODEVICE is None:
937
logger.error(u"SO_BINDTODEVICE does not exist;"
938
u" cannot bind to interface %s",
939
self.interface)
940
else:
109
return now < (self.last_seen + self.timeout)
110
def it_is_time_to_check(self, now=None):
111
if now is None:
112
now = datetime.datetime.now()
113
return self.next_check <= now
114
115
116
class server_metaclass(type):
117
"Common behavior for the UDP and TCP server classes"
118
def __new__(cls, name, bases, attrs):
119
attrs["address_family"] = socket.AF_INET6
120
attrs["allow_reuse_address"] = True
121
def server_bind(self):
122
if self.options.interface:
123
if not hasattr(socket, "SO_BINDTODEVICE"):
124
# From /usr/include/asm-i486/socket.h
125
socket.SO_BINDTODEVICE = 25
941
126
try:
942
127
self.socket.setsockopt(socket.SOL_SOCKET,
943
SO_BINDTODEVICE,
944
str(self.interface
945
+ u'\0'))
128
socket.SO_BINDTODEVICE,
129
self.options.interface)
946
130
except socket.error, error:
947
131
if error[0] == errno.EPERM:
948
logger.error(u"No permission to"
949
u" bind to interface %s",
950
self.interface)
951
elif error[0] == errno.ENOPROTOOPT:
952
logger.error(u"SO_BINDTODEVICE not available;"
953
u" cannot bind to interface %s",
954
self.interface)
132
print "Warning: No permission to bind to interface", \
133
self.options.interface
955
134
else:
956
raise
957
# Only bind(2) the socket if we really need to.
958
if self.server_address[0] or self.server_address[1]:
959
if not self.server_address[0]:
960
if self.address_family == socket.AF_INET6:
961
any_address = u"::" # in6addr_any
962
else:
963
any_address = socket.INADDR_ANY
964
self.server_address = (any_address,
965
self.server_address[1])
966
elif not self.server_address[1]:
967
self.server_address = (self.server_address[0],
968
0)
969
# if self.interface:
970
# self.server_address = (self.server_address[0],
971
# 0, # port
972
# 0, # flowinfo
973
# if_nametoindex
974
# (self.interface))
975
return socketserver.TCPServer.server_bind(self)
976
977
978
class MandosServer(IPv6_TCPServer):
979
"""Mandos server.
980
981
Attributes:
982
clients: set of Client objects
983
gnutls_priority GnuTLS priority string
984
use_dbus: Boolean; to emit D-Bus signals or not
985
clients: set of Client objects
986
gnutls_priority GnuTLS priority string
987
use_dbus: Boolean; to emit D-Bus signals or not
988
989
Assumes a gobject.MainLoop event loop.
990
"""
991
def __init__(self, server_address, RequestHandlerClass,
992
interface=None, use_ipv6=True, clients=None,
993
gnutls_priority=None, use_dbus=True):
994
self.enabled = False
995
self.clients = clients
996
if self.clients is None:
997
self.clients = set()
998
self.use_dbus = use_dbus
999
self.gnutls_priority = gnutls_priority
1000
IPv6_TCPServer.__init__(self, server_address,
1001
RequestHandlerClass,
1002
interface = interface,
1003
use_ipv6 = use_ipv6)
1004
def server_activate(self):
1005
if self.enabled:
1006
return socketserver.TCPServer.server_activate(self)
1007
def enable(self):
1008
self.enabled = True
1009
def add_pipe(self, pipe):
1010
# Call "handle_ipc" for both data and EOF events
1011
gobject.io_add_watch(pipe, gobject.IO_IN | gobject.IO_HUP,
1012
self.handle_ipc)
1013
def handle_ipc(self, source, condition, file_objects={}):
1014
condition_names = {
1015
gobject.IO_IN: u"IN", # There is data to read.
1016
gobject.IO_OUT: u"OUT", # Data can be written (without
1017
# blocking).
1018
gobject.IO_PRI: u"PRI", # There is urgent data to read.
1019
gobject.IO_ERR: u"ERR", # Error condition.
1020
gobject.IO_HUP: u"HUP" # Hung up (the connection has been
1021
# broken, usually for pipes and
1022
# sockets).
1023
}
1024
conditions_string = ' | '.join(name
1025
for cond, name in
1026
condition_names.iteritems()
1027
if cond & condition)
1028
logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
1029
conditions_string)
1030
1031
# Turn the pipe file descriptor into a Python file object
1032
if source not in file_objects:
1033
file_objects[source] = os.fdopen(source, u"r", 1)
1034
1035
# Read a line from the file object
1036
cmdline = file_objects[source].readline()
1037
if not cmdline: # Empty line means end of file
1038
# close the IPC pipe
1039
file_objects[source].close()
1040
del file_objects[source]
1041
1042
# Stop calling this function
1043
return False
1044
1045
logger.debug(u"IPC command: %r", cmdline)
1046
1047
# Parse and act on command
1048
cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
1049
1050
if cmd == u"NOTFOUND":
1051
logger.warning(u"Client not found for fingerprint: %s",
1052
args)
1053
if self.use_dbus:
1054
# Emit D-Bus signal
1055
mandos_dbus_service.ClientNotFound(args)
1056
elif cmd == u"INVALID":
1057
for client in self.clients:
1058
if client.name == args:
1059
logger.warning(u"Client %s is invalid", args)
1060
if self.use_dbus:
1061
# Emit D-Bus signal
1062
client.Rejected()
1063
break
1064
else:
1065
logger.error(u"Unknown client %s is invalid", args)
1066
elif cmd == u"SENDING":
1067
for client in self.clients:
1068
if client.name == args:
1069
logger.info(u"Sending secret to %s", client.name)
1070
client.checked_ok()
1071
if self.use_dbus:
1072
# Emit D-Bus signal
1073
client.ReceivedSecret()
1074
break
1075
else:
1076
logger.error(u"Sending secret to unknown client %s",
1077
args)
1078
else:
1079
logger.error(u"Unknown IPC command: %r", cmdline)
1080
1081
# Keep calling this function
1082
return True
135
raise error
136
return super(type(self), self).server_bind()
137
attrs["server_bind"] = server_bind
138
def init(self, *args, **kwargs):
139
if "options" in kwargs:
140
self.options = kwargs["options"]
141
del kwargs["options"]
142
if "clients" in kwargs:
143
self.clients = kwargs["clients"]
144
del kwargs["clients"]
145
if "credentials" in kwargs:
146
self.credentials = kwargs["credentials"]
147
del kwargs["credentials"]
148
return super(type(self), self).__init__(*args, **kwargs)
149
attrs["__init__"] = init
150
return type.__new__(cls, name, bases, attrs)
151
152
153
class udp_handler(SocketServer.DatagramRequestHandler, object):
154
def handle(self):
155
self.wfile.write("Polo")
156
print "UDP request answered"
157
158
159
class IPv6_UDPServer(SocketServer.UDPServer, object):
160
__metaclass__ = server_metaclass
161
def verify_request(self, request, client_address):
162
print "UDP request came"
163
return request[0] == "Marco"
164
165
166
class tcp_handler(SocketServer.BaseRequestHandler, object):
167
def handle(self):
168
print "TCP request came"
169
print "Request:", self.request
170
print "Client Address:", self.client_address
171
print "Server:", self.server
172
session = gnutls.connection.ServerSession(self.request,
173
self.server.credentials)
174
session.handshake()
175
if session.peer_certificate:
176
print "DN:", session.peer_certificate.subject
177
try:
178
session.verify_peer()
179
except gnutls.errors.CertificateError, error:
180
print "Verify failed", error
181
session.bye()
182
return
183
try:
184
session.send([client.password
185
for client in self.server.clients
186
if (client.dn ==
187
session.peer_certificate.subject)][0])
188
except IndexError:
189
session.send("gazonk")
190
# Log maybe? XXX
191
session.bye()
192
193
194
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
195
__metaclass__ = server_metaclass
1083
196
1084
197
1085
198
def string_to_delta(interval):
1086
199
"""Parse a string and return a datetime.timedelta
1087
1088
>>> string_to_delta(u'7d')
200
201
>>> string_to_delta('7d')
1089
202
datetime.timedelta(7)
1090
>>> string_to_delta(u'60s')
203
>>> string_to_delta('60s')
1091
204
datetime.timedelta(0, 60)
1092
>>> string_to_delta(u'60m')
205
>>> string_to_delta('60m')
1093
206
datetime.timedelta(0, 3600)
1094
>>> string_to_delta(u'24h')
207
>>> string_to_delta('24h')
1095
208
datetime.timedelta(1)
1096
209
>>> string_to_delta(u'1w')
1097
210
datetime.timedelta(7)
1098
>>> string_to_delta(u'5m 30s')
1099
datetime.timedelta(0, 330)
1100
211
"""
1101
timevalue = datetime.timedelta(0)
1102
for s in interval.split():
1103
try:
1104
suffix = unicode(s[-1])
1105
value = int(s[:-1])
1106
if suffix == u"d":
1107
delta = datetime.timedelta(value)
1108
elif suffix == u"s":
1109
delta = datetime.timedelta(0, value)
1110
elif suffix == u"m":
1111
delta = datetime.timedelta(0, 0, 0, 0, value)
1112
elif suffix == u"h":
1113
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1114
elif suffix == u"w":
1115
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1116
else:
1117
raise ValueError
1118
except (ValueError, IndexError):
212
try:
213
suffix=unicode(interval[-1])
214
value=int(interval[:-1])
215
if suffix == u"d":
216
delta = datetime.timedelta(value)
217
elif suffix == u"s":
218
delta = datetime.timedelta(0, value)
219
elif suffix == u"m":
220
delta = datetime.timedelta(0, 0, 0, 0, value)
221
elif suffix == u"h":
222
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
223
elif suffix == u"w":
224
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
225
else:
1119
226
raise ValueError
1120
timevalue += delta
1121
return timevalue
1122
1123
1124
def if_nametoindex(interface):
1125
"""Call the C function if_nametoindex(), or equivalent
1126
1127
Note: This function cannot accept a unicode string."""
1128
global if_nametoindex
1129
try:
1130
if_nametoindex = (ctypes.cdll.LoadLibrary
1131
(ctypes.util.find_library(u"c"))
1132
.if_nametoindex)
1133
except (OSError, AttributeError):
1134
logger.warning(u"Doing if_nametoindex the hard way")
1135
def if_nametoindex(interface):
1136
"Get an interface index the hard way, i.e. using fcntl()"
1137
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1138
with closing(socket.socket()) as s:
1139
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1140
struct.pack(str(u"16s16x"),
1141
interface))
1142
interface_index = struct.unpack(str(u"I"),
1143
ifreq[16:20])[0]
1144
return interface_index
1145
return if_nametoindex(interface)
1146
1147
1148
def daemon(nochdir = False, noclose = False):
1149
"""See daemon(3). Standard BSD Unix function.
1150
1151
This should really exist as os.daemon, but it doesn't (yet)."""
1152
if os.fork():
1153
sys.exit()
1154
os.setsid()
1155
if not nochdir:
1156
os.chdir(u"/")
1157
if os.fork():
1158
sys.exit()
1159
if not noclose:
1160
# Close all standard open file descriptors
1161
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1162
if not stat.S_ISCHR(os.fstat(null).st_mode):
1163
raise OSError(errno.ENODEV,
1164
u"/dev/null not a character device")
1165
os.dup2(null, sys.stdin.fileno())
1166
os.dup2(null, sys.stdout.fileno())
1167
os.dup2(null, sys.stderr.fileno())
1168
if null > 2:
1169
os.close(null)
227
except (ValueError, IndexError):
228
raise ValueError
229
return delta
1170
230
1171
231
1172
232
def main():
1173
1174
######################################################################
1175
# Parsing of options, both command line and config file
1176
1177
parser = optparse.OptionParser(version = "%%prog %s" % version)
1178
parser.add_option("-i", u"--interface", type=u"string",
1179
metavar="IF", help=u"Bind to interface IF")
1180
parser.add_option("-a", u"--address", type=u"string",
1181
help=u"Address to listen for requests on")
1182
parser.add_option("-p", u"--port", type=u"int",
1183
help=u"Port number to receive requests on")
1184
parser.add_option("--check", action=u"store_true",
1185
help=u"Run self-test")
1186
parser.add_option("--debug", action=u"store_true",
1187
help=u"Debug mode; run in foreground and log to"
1188
u" terminal")
1189
parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1190
u" priority string (see GnuTLS documentation)")
1191
parser.add_option("--servicename", type=u"string",
1192
metavar=u"NAME", help=u"Zeroconf service name")
1193
parser.add_option("--configdir", type=u"string",
1194
default=u"/etc/mandos", metavar=u"DIR",
1195
help=u"Directory to search for configuration"
1196
u" files")
1197
parser.add_option("--no-dbus", action=u"store_false",
1198
dest=u"use_dbus", help=u"Do not provide D-Bus"
1199
u" system bus interface")
1200
parser.add_option("--no-ipv6", action=u"store_false",
1201
dest=u"use_ipv6", help=u"Do not use IPv6")
1202
options = parser.parse_args()[0]
1203
233
parser = OptionParser()
234
parser.add_option("-i", "--interface", type="string",
235
default="eth0", metavar="IF",
236
help="Interface to bind to")
237
parser.add_option("--cert", type="string", default="cert.pem",
238
metavar="FILE",
239
help="Public key certificate to use")
240
parser.add_option("--key", type="string", default="key.pem",
241
metavar="FILE",
242
help="Private key to use")
243
parser.add_option("--ca", type="string", default="ca.pem",
244
metavar="FILE",
245
help="Certificate Authority certificate to use")
246
parser.add_option("--crl", type="string", default="crl.pem",
247
metavar="FILE",
248
help="Certificate Revokation List to use")
249
parser.add_option("-p", "--port", type="int", default=49001,
250
help="Port number to receive requests on")
251
parser.add_option("--dh", type="int", metavar="BITS",
252
help="DH group to use")
253
parser.add_option("-t", "--timeout", type="string", # Parsed later
254
default="15m",
255
help="Amount of downtime allowed for clients")
256
parser.add_option("--interval", type="string", # Parsed later
257
default="5m",
258
help="How often to check that a client is up")
259
parser.add_option("--check", action="store_true", default=False,
260
help="Run self-test")
261
(options, args) = parser.parse_args()
262
1204
263
if options.check:
1205
264
import doctest
1206
265
doctest.testmod()
1207
266
sys.exit()
1208
267
1209
# Default values for config file for server-global settings
1210
server_defaults = { u"interface": u"",
1211
u"address": u"",
1212
u"port": u"",
1213
u"debug": u"False",
1214
u"priority":
1215
u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1216
u"servicename": u"Mandos",
1217
u"use_dbus": u"True",
1218
u"use_ipv6": u"True",
1219
}
1220
1221
# Parse config file for server-global settings
1222
server_config = configparser.SafeConfigParser(server_defaults)
1223
del server_defaults
1224
server_config.read(os.path.join(options.configdir,
1225
u"mandos.conf"))
1226
# Convert the SafeConfigParser object to a dict
1227
server_settings = server_config.defaults()
1228
# Use the appropriate methods on the non-string config options
1229
for option in (u"debug", u"use_dbus", u"use_ipv6"):
1230
server_settings[option] = server_config.getboolean(u"DEFAULT",
1231
option)
1232
if server_settings["port"]:
1233
server_settings["port"] = server_config.getint(u"DEFAULT",
1234
u"port")
1235
del server_config
1236
1237
# Override the settings from the config file with command line
1238
# options, if set.
1239
for option in (u"interface", u"address", u"port", u"debug",
1240
u"priority", u"servicename", u"configdir",
1241
u"use_dbus", u"use_ipv6"):
1242
value = getattr(options, option)
1243
if value is not None:
1244
server_settings[option] = value
1245
del options
1246
# Force all strings to be unicode
1247
for option in server_settings.keys():
1248
if type(server_settings[option]) is str:
1249
server_settings[option] = unicode(server_settings[option])
1250
# Now we have our good server settings in "server_settings"
1251
1252
##################################################################
1253
1254
# For convenience
1255
debug = server_settings[u"debug"]
1256
use_dbus = server_settings[u"use_dbus"]
1257
use_ipv6 = server_settings[u"use_ipv6"]
1258
1259
if not debug:
1260
syslogger.setLevel(logging.WARNING)
1261
console.setLevel(logging.WARNING)
1262
1263
if server_settings[u"servicename"] != u"Mandos":
1264
syslogger.setFormatter(logging.Formatter
1265
(u'Mandos (%s) [%%(process)d]:'
1266
u' %%(levelname)s: %%(message)s'
1267
% server_settings[u"servicename"]))
1268
1269
# Parse config file with clients
1270
client_defaults = { u"timeout": u"1h",
1271
u"interval": u"5m",
1272
u"checker": u"fping -q -- %%(host)s",
1273
u"host": u"",
1274
}
1275
client_config = configparser.SafeConfigParser(client_defaults)
1276
client_config.read(os.path.join(server_settings[u"configdir"],
1277
u"clients.conf"))
1278
1279
global mandos_dbus_service
1280
mandos_dbus_service = None
1281
1282
tcp_server = MandosServer((server_settings[u"address"],
1283
server_settings[u"port"]),
1284
ClientHandler,
1285
interface=server_settings[u"interface"],
1286
use_ipv6=use_ipv6,
1287
gnutls_priority=
1288
server_settings[u"priority"],
1289
use_dbus=use_dbus)
1290
pidfilename = u"/var/run/mandos.pid"
1291
try:
1292
pidfile = open(pidfilename, u"w")
1293
except IOError:
1294
logger.error(u"Could not open file %r", pidfilename)
1295
1296
try:
1297
uid = pwd.getpwnam(u"_mandos").pw_uid
1298
gid = pwd.getpwnam(u"_mandos").pw_gid
1299
except KeyError:
1300
try:
1301
uid = pwd.getpwnam(u"mandos").pw_uid
1302
gid = pwd.getpwnam(u"mandos").pw_gid
1303
except KeyError:
1304
try:
1305
uid = pwd.getpwnam(u"nobody").pw_uid
1306
gid = pwd.getpwnam(u"nobody").pw_gid
1307
except KeyError:
1308
uid = 65534
1309
gid = 65534
1310
try:
1311
os.setgid(gid)
1312
os.setuid(uid)
1313
except OSError, error:
1314
if error[0] != errno.EPERM:
1315
raise error
1316
1317
# Enable all possible GnuTLS debugging
1318
if debug:
1319
# "Use a log level over 10 to enable all debugging options."
1320
# - GnuTLS manual
1321
gnutls.library.functions.gnutls_global_set_log_level(11)
1322
1323
@gnutls.library.types.gnutls_log_func
1324
def debug_gnutls(level, string):
1325
logger.debug(u"GnuTLS: %s", string[:-1])
1326
1327
(gnutls.library.functions
1328
.gnutls_global_set_log_function(debug_gnutls))
1329
1330
global main_loop
1331
# From the Avahi example code
1332
DBusGMainLoop(set_as_default=True )
1333
main_loop = gobject.MainLoop()
1334
bus = dbus.SystemBus()
1335
# End of Avahi example code
1336
if use_dbus:
1337
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1338
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1339
service = AvahiService(name = server_settings[u"servicename"],
1340
servicetype = u"_mandos._tcp",
1341
protocol = protocol, bus = bus)
1342
if server_settings["interface"]:
1343
service.interface = (if_nametoindex
1344
(str(server_settings[u"interface"])))
1345
1346
client_class = Client
1347
if use_dbus:
1348
client_class = functools.partial(ClientDBus, bus = bus)
1349
tcp_server.clients.update(set(
1350
client_class(name = section,
1351
config= dict(client_config.items(section)))
1352
for section in client_config.sections()))
1353
if not tcp_server.clients:
1354
logger.warning(u"No clients defined")
1355
1356
if debug:
1357
# Redirect stdin so all checkers get /dev/null
1358
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1359
os.dup2(null, sys.stdin.fileno())
1360
if null > 2:
1361
os.close(null)
1362
else:
1363
# No console logging
1364
logger.removeHandler(console)
1365
# Close all input and output, do double fork, etc.
1366
daemon()
1367
1368
try:
1369
with closing(pidfile):
1370
pid = os.getpid()
1371
pidfile.write(str(pid) + "\n")
1372
del pidfile
1373
except IOError:
1374
logger.error(u"Could not write to file %r with PID %d",
1375
pidfilename, pid)
1376
except NameError:
1377
# "pidfile" was never created
1378
pass
1379
del pidfilename
1380
1381
def cleanup():
1382
"Cleanup function; run on exit"
1383
service.cleanup()
1384
1385
while tcp_server.clients:
1386
client = tcp_server.clients.pop()
1387
client.disable_hook = None
1388
client.disable()
1389
1390
atexit.register(cleanup)
1391
1392
if not debug:
1393
signal.signal(signal.SIGINT, signal.SIG_IGN)
1394
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1395
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1396
1397
if use_dbus:
1398
class MandosDBusService(dbus.service.Object):
1399
"""A D-Bus proxy object"""
1400
def __init__(self):
1401
dbus.service.Object.__init__(self, bus, u"/")
1402
_interface = u"se.bsnet.fukt.Mandos"
1403
1404
@dbus.service.signal(_interface, signature=u"oa{sv}")
1405
def ClientAdded(self, objpath, properties):
1406
"D-Bus signal"
1407
pass
1408
1409
@dbus.service.signal(_interface, signature=u"s")
1410
def ClientNotFound(self, fingerprint):
1411
"D-Bus signal"
1412
pass
1413
1414
@dbus.service.signal(_interface, signature=u"os")
1415
def ClientRemoved(self, objpath, name):
1416
"D-Bus signal"
1417
pass
1418
1419
@dbus.service.method(_interface, out_signature=u"ao")
1420
def GetAllClients(self):
1421
"D-Bus method"
1422
return dbus.Array(c.dbus_object_path
1423
for c in tcp_server.clients)
1424
1425
@dbus.service.method(_interface,
1426
out_signature=u"a{oa{sv}}")
1427
def GetAllClientsWithProperties(self):
1428
"D-Bus method"
1429
return dbus.Dictionary(
1430
((c.dbus_object_path, c.GetAllProperties())
1431
for c in tcp_server.clients),
1432
signature=u"oa{sv}")
1433
1434
@dbus.service.method(_interface, in_signature=u"o")
1435
def RemoveClient(self, object_path):
1436
"D-Bus method"
1437
for c in tcp_server.clients:
1438
if c.dbus_object_path == object_path:
1439
tcp_server.clients.remove(c)
1440
c.remove_from_connection()
1441
# Don't signal anything except ClientRemoved
1442
c.disable(signal=False)
1443
# Emit D-Bus signal
1444
self.ClientRemoved(object_path, c.name)
1445
return
1446
raise KeyError
1447
1448
del _interface
1449
1450
mandos_dbus_service = MandosDBusService()
1451
1452
for client in tcp_server.clients:
1453
if use_dbus:
1454
# Emit D-Bus signal
1455
mandos_dbus_service.ClientAdded(client.dbus_object_path,
1456
client.GetAllProperties())
1457
client.enable()
1458
1459
tcp_server.enable()
1460
tcp_server.server_activate()
1461
1462
# Find out what port we got
1463
service.port = tcp_server.socket.getsockname()[1]
1464
if use_ipv6:
1465
logger.info(u"Now listening on address %r, port %d,"
1466
" flowinfo %d, scope_id %d"
1467
% tcp_server.socket.getsockname())
1468
else: # IPv4
1469
logger.info(u"Now listening on address %r, port %d"
1470
% tcp_server.socket.getsockname())
1471
1472
#service.interface = tcp_server.socket.getsockname()[3]
1473
1474
try:
1475
# From the Avahi example code
1476
try:
1477
service.activate()
1478
except dbus.exceptions.DBusException, error:
1479
logger.critical(u"DBusException: %s", error)
1480
sys.exit(1)
1481
# End of Avahi example code
1482
1483
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1484
lambda *args, **kwargs:
1485
(tcp_server.handle_request
1486
(*args[2:], **kwargs) or True))
1487
1488
logger.debug(u"Starting main loop")
1489
main_loop.run()
1490
except AvahiError, error:
1491
logger.critical(u"AvahiError: %s", error)
1492
sys.exit(1)
1493
except KeyboardInterrupt:
1494
if debug:
1495
print >> sys.stderr
1496
logger.debug(u"Server received KeyboardInterrupt")
1497
logger.debug(u"Server exiting")
1498
1499
if __name__ == '__main__':
268
# Parse the time arguments
269
try:
270
options.timeout = string_to_delta(options.timeout)
271
except ValueError:
272
parser.error("option --timeout: Unparseable time")
273
274
try:
275
options.interval = string_to_delta(options.interval)
276
except ValueError:
277
parser.error("option --interval: Unparseable time")
278
279
cert = gnutls.crypto.X509Certificate(open(options.cert).read())
280
key = gnutls.crypto.X509PrivateKey(open(options.key).read())
281
ca = gnutls.crypto.X509Certificate(open(options.ca).read())
282
crl = gnutls.crypto.X509CRL(open(options.crl).read())
283
cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
284
285
# Parse config file
286
defaults = {}
287
client_config_object = ConfigParser.SafeConfigParser(defaults)
288
client_config_object.read("mandos-clients.conf")
289
clients = Set(Client(name=section, options=options,
290
**(dict(client_config_object\
291
.items(section))))
292
for section in client_config_object.sections())
293
294
in6addr_any = "::"
295
udp_server = IPv6_UDPServer((in6addr_any, options.port),
296
udp_handler,
297
options=options)
298
299
tcp_server = IPv6_TCPServer((in6addr_any, options.port),
300
tcp_handler,
301
options=options,
302
clients=clients,
303
credentials=cred)
304
305
while True:
306
if not clients:
307
break
308
try:
309
next_stop = min(client.next_stop() for client in clients)
310
now = datetime.datetime.now()
311
if next_stop > now:
312
delay = next_stop - now
313
delay_seconds = (delay.days * 24 * 60 * 60
314
+ delay.seconds
315
+ delay.microseconds / 1000000)
316
clients_with_checkers = tuple(client for client in
317
clients
318
if client.checker
319
is not None)
320
input_checks = (udp_server, tcp_server) \
321
+ clients_with_checkers
322
print "Waiting for network",
323
if clients_with_checkers:
324
print "and checkers for:",
325
for client in clients_with_checkers:
326
print client.name,
327
print
328
input, out, err = select.select(input_checks, (), (),
329
delay_seconds)
330
for obj in input:
331
obj.handle_request()
332
# start new checkers
333
for client in clients:
334
if client.it_is_time_to_check(now=now) and \
335
client.checker is None:
336
print "Starting checker for client %(name)s" \
337
% vars(client)
338
client.start_checker()
339
# delete timed-out clients
340
for client in clients.copy():
341
if not client.still_valid(now=now):
342
# log xxx
343
print "Removing client %(name)s" % vars(client)
344
clients.remove(client)
345
except KeyboardInterrupt:
346
break
347
348
# Cleanup here
349
for client in clients:
350
client.stop_checker()
351
352
353
if __name__ == "__main__":
1500
354
main()
355
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0