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- Committer: Teddy Hogeborn
- Date: 2008-08-03 21:45:14 UTC
- mfrom: (24.1.13 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080803214514-plvvkrpoitwsrxeg
Merge.
- files added:
- plugbasedclient.c
- plugins.d
- files removed:
- client.cpp
- files renamed:
- mandos-clients.conf => clients.conf
- 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
# following functions: "AvahiService.add", "AvahiService.remove",
10
# "server_state_changed", "entry_group_state_changed", and some lines
11
# in "main".
12
#
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
15
#
16
# This program is free software: you can redistribute it and/or modify
17
# it under the terms of the GNU General Public License as published by
18
# the Free Software Foundation, either version 3 of the License, or
19
# (at your option) any later version.
20
#
21
# This program is distributed in the hope that it will be useful,
22
# but WITHOUT ANY WARRANTY; without even the implied warranty of
23
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24
# GNU General Public License for more details.
25
#
26
# You should have received a copy of the GNU General Public License
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
28
#
29
# Contact the authors at <mandos@fukt.bsnet.se>.
30
#
2
31
3
32
from __future__ import division
4
33
21
50
import signal
22
51
from sets import Set
23
52
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
24
57
25
58
import dbus
26
59
import gobject
28
61
from dbus.mainloop.glib import DBusGMainLoop
29
62
import ctypes
30
63
31
# This variable is used to optionally bind to a specified interface.
32
# It is a global variable to fit in with the other variables from the
33
# Avahi server example code.
34
serviceInterface = avahi.IF_UNSPEC
35
# From the Avahi server example code:
36
serviceName = "Mandos"
37
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
38
servicePort = None # Not known at startup
39
serviceTXT = [] # TXT record for the service
40
domain = "" # Domain to publish on, default to .local
41
host = "" # Host to publish records for, default to localhost
42
group = None #our entry group
43
rename_count = 12 # Counter so we only rename after collisions a
44
# sensible number of times
64
# Brief description of the operation of this program:
65
#
66
# This server announces itself as a Zeroconf service. Connecting
67
# clients use the TLS protocol, with the unusual quirk that this
68
# server program acts as a TLS "client" while a connecting client acts
69
# as a TLS "server". The client (acting as a TLS "server") must
70
# supply an OpenPGP certificate, and the fingerprint of this
71
# certificate is used by this server to look up (in a list read from a
72
# file at start time) which binary blob to give the client. No other
73
# authentication or authorization is done by this server.
74
75
76
logger = logging.Logger('mandos')
77
syslogger = logging.handlers.SysLogHandler\
78
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
79
syslogger.setFormatter(logging.Formatter\
80
('%(levelname)s: %(message)s'))
81
logger.addHandler(syslogger)
82
del syslogger
83
84
85
class AvahiError(Exception):
86
def __init__(self, value):
87
self.value = value
88
def __str__(self):
89
return repr(self.value)
90
91
class AvahiServiceError(AvahiError):
92
pass
93
94
class AvahiGroupError(AvahiError):
95
pass
96
97
98
class AvahiService(object):
99
"""
100
interface: integer; avahi.IF_UNSPEC or an interface index.
101
Used to optionally bind to the specified interface.
102
name = string; Example: "Mandos"
103
type = string; Example: "_mandos._tcp".
104
See <http://www.dns-sd.org/ServiceTypes.html>
105
port = integer; what port to announce
106
TXT = list of strings; TXT record for the service
107
domain = string; Domain to publish on, default to .local if empty.
108
host = string; Host to publish records for, default to localhost
109
if empty.
110
max_renames = integer; maximum number of renames
111
rename_count = integer; counter so we only rename after collisions
112
a sensible number of times
113
"""
114
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
type = None, port = None, TXT = None, domain = "",
116
host = "", max_renames = 12):
117
"""An Avahi (Zeroconf) service. """
118
self.interface = interface
119
self.name = name
120
self.type = type
121
self.port = port
122
if TXT is None:
123
self.TXT = []
124
else:
125
self.TXT = TXT
126
self.domain = domain
127
self.host = host
128
self.rename_count = 0
129
def rename(self):
130
"""Derived from the Avahi example code"""
131
if self.rename_count >= self.max_renames:
132
logger.critical(u"No suitable service name found after %i"
133
u" retries, exiting.", rename_count)
134
raise AvahiServiceError("Too many renames")
135
name = server.GetAlternativeServiceName(name)
136
logger.notice(u"Changing name to %r ...", name)
137
self.remove()
138
self.add()
139
self.rename_count += 1
140
def remove(self):
141
"""Derived from the Avahi example code"""
142
if group is not None:
143
group.Reset()
144
def add(self):
145
"""Derived from the Avahi example code"""
146
global group
147
if group is None:
148
group = dbus.Interface\
149
(bus.get_object(avahi.DBUS_NAME,
150
server.EntryGroupNew()),
151
avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
group.connect_to_signal('StateChanged',
153
entry_group_state_changed)
154
logger.debug(u"Adding service '%s' of type '%s' ...",
155
service.name, service.type)
156
group.AddService(
157
self.interface, # interface
158
avahi.PROTO_INET6, # protocol
159
dbus.UInt32(0), # flags
160
self.name, self.type,
161
self.domain, self.host,
162
dbus.UInt16(self.port),
163
avahi.string_array_to_txt_array(self.TXT))
164
group.Commit()
165
166
# From the Avahi example code:
167
group = None # our entry group
45
168
# End of Avahi example code
46
169
47
170
53
176
uniquely identify the client
54
177
secret: bytestring; sent verbatim (over TLS) to client
55
178
fqdn: string (FQDN); available for use by the checker command
56
created: datetime.datetime()
57
last_seen: datetime.datetime() or None if not yet seen
58
timeout: datetime.timedelta(); How long from last_seen until
59
this client is invalid
179
created: datetime.datetime(); object creation, not client host
180
last_checked_ok: datetime.datetime() or None if not yet checked OK
181
timeout: datetime.timedelta(); How long from last_checked_ok
182
until this client is invalid
60
183
interval: datetime.timedelta(); How often to start a new checker
61
184
stop_hook: If set, called by stop() as stop_hook(self)
62
185
checker: subprocess.Popen(); a running checker process used
63
186
to see if the client lives.
64
Is None if no process is running.
187
'None' if no process is running.
65
188
checker_initiator_tag: a gobject event source tag, or None
66
189
stop_initiator_tag: - '' -
67
190
checker_callback_tag: - '' -
68
191
checker_command: string; External command which is run to check if
69
client lives. %()s expansions are done at
192
client lives. %() expansions are done at
70
193
runtime with vars(self) as dict, so that for
71
194
instance %(name)s can be used in the command.
72
195
Private attibutes:
73
196
_timeout: Real variable for 'timeout'
74
197
_interval: Real variable for 'interval'
75
_timeout_milliseconds: Used by gobject.timeout_add()
198
_timeout_milliseconds: Used when calling gobject.timeout_add()
76
199
_interval_milliseconds: - '' -
77
200
"""
78
201
def _set_timeout(self, timeout):
98
221
interval = property(lambda self: self._interval,
99
222
_set_interval)
100
223
del _set_interval
101
def __init__(self, name=None, options=None, stop_hook=None,
102
fingerprint=None, secret=None, secfile=None, fqdn=None,
103
timeout=None, interval=-1, checker=None):
224
def __init__(self, name=None, stop_hook=None, fingerprint=None,
225
secret=None, secfile=None, fqdn=None, timeout=None,
226
interval=-1, checker=None):
227
"""Note: the 'checker' argument sets the 'checker_command'
228
attribute and not the 'checker' attribute.."""
104
229
self.name = name
230
logger.debug(u"Creating client %r", self.name)
105
231
# Uppercase and remove spaces from fingerprint
106
232
# for later comparison purposes with return value of
107
233
# the fingerprint() function
108
234
self.fingerprint = fingerprint.upper().replace(u" ", u"")
235
logger.debug(u" Fingerprint: %s", self.fingerprint)
109
236
if secret:
110
237
self.secret = secret.decode(u"base64")
111
238
elif secfile:
113
240
self.secret = sf.read()
114
241
sf.close()
115
242
else:
116
raise RuntimeError(u"No secret or secfile for client %s"
117
% self.name)
118
self.fqdn = fqdn # string
243
raise TypeError(u"No secret or secfile for client %s"
244
% self.name)
245
self.fqdn = fqdn
119
246
self.created = datetime.datetime.now()
120
self.last_seen = None
121
if timeout is None:
122
timeout = options.timeout
123
self.timeout = timeout
124
if interval == -1:
125
interval = options.interval
126
else:
127
interval = string_to_delta(interval)
128
self.interval = interval
247
self.last_checked_ok = None
248
self.timeout = string_to_delta(timeout)
249
self.interval = string_to_delta(interval)
129
250
self.stop_hook = stop_hook
130
251
self.checker = None
131
252
self.checker_initiator_tag = None
133
254
self.checker_callback_tag = None
134
255
self.check_command = checker
135
256
def start(self):
136
"""Start this clients checker and timeout hooks"""
257
"""Start this client's checker and timeout hooks"""
137
258
# Schedule a new checker to be started an 'interval' from now,
138
259
# and every interval from then on.
139
260
self.checker_initiator_tag = gobject.timeout_add\
147
268
self.stop)
148
269
def stop(self):
149
270
"""Stop this client.
150
The possibility that this client might be restarted is left
151
open, but not currently used."""
152
if debug:
153
sys.stderr.write(u"Stopping client %s\n" % self.name)
154
self.secret = None
155
if self.stop_initiator_tag:
271
The possibility that a client might be restarted is left open,
272
but not currently used."""
273
# If this client doesn't have a secret, it is already stopped.
274
if self.secret:
275
logger.debug(u"Stopping client %s", self.name)
276
self.secret = None
277
else:
278
return False
279
if getattr(self, "stop_initiator_tag", False):
156
280
gobject.source_remove(self.stop_initiator_tag)
157
281
self.stop_initiator_tag = None
158
if self.checker_initiator_tag:
282
if getattr(self, "checker_initiator_tag", False):
159
283
gobject.source_remove(self.checker_initiator_tag)
160
284
self.checker_initiator_tag = None
161
285
self.stop_checker()
164
288
# Do not run this again if called by a gobject.timeout_add
165
289
return False
166
290
def __del__(self):
167
# Some code duplication here and in stop()
168
if hasattr(self, "stop_initiator_tag") \
169
and self.stop_initiator_tag:
170
gobject.source_remove(self.stop_initiator_tag)
171
self.stop_initiator_tag = None
172
if hasattr(self, "checker_initiator_tag") \
173
and self.checker_initiator_tag:
174
gobject.source_remove(self.checker_initiator_tag)
175
self.checker_initiator_tag = None
176
self.stop_checker()
291
self.stop_hook = None
292
self.stop()
177
293
def checker_callback(self, pid, condition):
178
294
"""The checker has completed, so take appropriate actions."""
179
295
now = datetime.datetime.now()
296
self.checker_callback_tag = None
297
self.checker = None
180
298
if os.WIFEXITED(condition) \
181
299
and (os.WEXITSTATUS(condition) == 0):
182
if debug:
183
sys.stderr.write(u"Checker for %(name)s succeeded\n"
184
% vars(self))
185
self.last_seen = now
300
logger.debug(u"Checker for %(name)s succeeded",
301
vars(self))
302
self.last_checked_ok = now
186
303
gobject.source_remove(self.stop_initiator_tag)
187
304
self.stop_initiator_tag = gobject.timeout_add\
188
305
(self._timeout_milliseconds,
189
306
self.stop)
190
elif debug:
191
if not os.WIFEXITED(condition):
192
sys.stderr.write(u"Checker for %(name)s crashed?\n"
193
% vars(self))
194
else:
195
sys.stderr.write(u"Checker for %(name)s failed\n"
196
% vars(self))
197
self.checker = None
198
self.checker_callback_tag = None
307
elif not os.WIFEXITED(condition):
308
logger.warning(u"Checker for %(name)s crashed?",
309
vars(self))
310
else:
311
logger.debug(u"Checker for %(name)s failed",
312
vars(self))
199
313
def start_checker(self):
200
314
"""Start a new checker subprocess if one is not running.
201
315
If a checker already exists, leave it running and do
202
316
nothing."""
317
# The reason for not killing a running checker is that if we
318
# did that, then if a checker (for some reason) started
319
# running slowly and taking more than 'interval' time, the
320
# client would inevitably timeout, since no checker would get
321
# a chance to run to completion. If we instead leave running
322
# checkers alone, the checker would have to take more time
323
# than 'timeout' for the client to be declared invalid, which
324
# is as it should be.
203
325
if self.checker is None:
204
if debug:
205
sys.stderr.write(u"Starting checker for %s\n"
206
% self.name)
207
326
try:
327
# In case check_command has exactly one % operator
208
328
command = self.check_command % self.fqdn
209
329
except TypeError:
330
# Escape attributes for the shell
210
331
escaped_attrs = dict((key, re.escape(str(val)))
211
332
for key, val in
212
333
vars(self).iteritems())
213
command = self.check_command % escaped_attrs
334
try:
335
command = self.check_command % escaped_attrs
336
except TypeError, error:
337
logger.error(u'Could not format string "%s":'
338
u' %s', self.check_command, error)
339
return True # Try again later
214
340
try:
215
self.checker = subprocess.\
216
Popen(command,
217
stdout=subprocess.PIPE,
218
close_fds=True, shell=True,
219
cwd="/")
220
self.checker_callback_tag = gobject.\
221
child_watch_add(self.checker.pid,
222
self.\
223
checker_callback)
341
logger.debug(u"Starting checker %r for %s",
342
command, self.name)
343
self.checker = subprocess.Popen(command,
344
close_fds=True,
345
shell=True, cwd="/")
346
self.checker_callback_tag = gobject.child_watch_add\
347
(self.checker.pid,
348
self.checker_callback)
224
349
except subprocess.OSError, error:
225
sys.stderr.write(u"Failed to start subprocess: %s\n"
226
% error)
350
logger.error(u"Failed to start subprocess: %s",
351
error)
227
352
# Re-run this periodically if run by gobject.timeout_add
228
353
return True
229
354
def stop_checker(self):
230
355
"""Force the checker process, if any, to stop."""
231
if not hasattr(self, "checker") or self.checker is None:
356
if self.checker_callback_tag:
357
gobject.source_remove(self.checker_callback_tag)
358
self.checker_callback_tag = None
359
if getattr(self, "checker", None) is None:
232
360
return
233
gobject.source_remove(self.checker_callback_tag)
234
self.checker_callback_tag = None
235
os.kill(self.checker.pid, signal.SIGTERM)
236
if self.checker.poll() is None:
237
os.kill(self.checker.pid, signal.SIGKILL)
361
logger.debug("Stopping checker for %(name)s", vars(self))
362
try:
363
os.kill(self.checker.pid, signal.SIGTERM)
364
#os.sleep(0.5)
365
#if self.checker.poll() is None:
366
# os.kill(self.checker.pid, signal.SIGKILL)
367
except OSError, error:
368
if error.errno != errno.ESRCH: # No such process
369
raise
238
370
self.checker = None
239
def still_valid(self, now=None):
371
def still_valid(self):
240
372
"""Has the timeout not yet passed for this client?"""
241
if now is None:
242
now = datetime.datetime.now()
243
if self.last_seen is None:
373
now = datetime.datetime.now()
374
if self.last_checked_ok is None:
244
375
return now < (self.created + self.timeout)
245
376
else:
246
return now < (self.last_seen + self.timeout)
377
return now < (self.last_checked_ok + self.timeout)
247
378
248
379
249
380
def peer_certificate(session):
381
"Return the peer's OpenPGP certificate as a bytestring"
250
382
# If not an OpenPGP certificate...
251
383
if gnutls.library.functions.gnutls_certificate_type_get\
252
384
(session._c_object) \
263
395
264
396
265
397
def fingerprint(openpgp):
398
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
266
399
# New empty GnuTLS certificate
267
400
crt = gnutls.library.types.gnutls_openpgp_crt_t()
268
401
gnutls.library.functions.gnutls_openpgp_crt_init\
298
431
Note: This will run in its own forked process."""
299
432
300
433
def handle(self):
301
if debug:
302
sys.stderr.write(u"TCP request came\n")
303
sys.stderr.write(u"Request: %s\n" % self.request)
304
sys.stderr.write(u"Client Address: %s\n"
305
% unicode(self.client_address))
306
sys.stderr.write(u"Server: %s\n" % self.server)
307
session = gnutls.connection.ClientSession(self.request,
308
gnutls.connection.\
309
X509Credentials())
434
logger.debug(u"TCP connection from: %s",
435
unicode(self.client_address))
436
session = gnutls.connection.ClientSession\
437
(self.request, gnutls.connection.X509Credentials())
438
439
line = self.request.makefile().readline()
440
logger.debug(u"Protocol version: %r", line)
441
try:
442
if int(line.strip().split()[0]) > 1:
443
raise RuntimeError
444
except (ValueError, IndexError, RuntimeError), error:
445
logger.error(u"Unknown protocol version: %s", error)
446
return
447
448
# Note: gnutls.connection.X509Credentials is really a generic
449
# GnuTLS certificate credentials object so long as no X.509
450
# keys are added to it. Therefore, we can use it here despite
451
# using OpenPGP certificates.
310
452
311
453
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
312
454
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
313
455
# "+DHE-DSS"))
314
priority = "SECURE256"
315
456
priority = "NORMAL" # Fallback default, since this
457
# MUST be set.
458
if self.server.settings["priority"]:
459
priority = self.server.settings["priority"]
316
460
gnutls.library.functions.gnutls_priority_set_direct\
317
461
(session._c_object, priority, None);
318
462
319
463
try:
320
464
session.handshake()
321
465
except gnutls.errors.GNUTLSError, error:
322
if debug:
323
sys.stderr.write(u"Handshake failed: %s\n" % error)
466
logger.debug(u"Handshake failed: %s", error)
324
467
# Do not run session.bye() here: the session is not
325
468
# established. Just abandon the request.
326
469
return
327
470
try:
328
471
fpr = fingerprint(peer_certificate(session))
329
472
except (TypeError, gnutls.errors.GNUTLSError), error:
330
if debug:
331
sys.stderr.write(u"Bad certificate: %s\n" % error)
473
logger.debug(u"Bad certificate: %s", error)
332
474
session.bye()
333
475
return
334
if debug:
335
sys.stderr.write(u"Fingerprint: %s\n" % fpr)
476
logger.debug(u"Fingerprint: %s", fpr)
336
477
client = None
337
for c in clients:
478
for c in self.server.clients:
338
479
if c.fingerprint == fpr:
339
480
client = c
340
481
break
482
if not client:
483
logger.debug(u"Client not found for fingerprint: %s", fpr)
484
session.bye()
485
return
341
486
# Have to check if client.still_valid(), since it is possible
342
487
# that the client timed out while establishing the GnuTLS
343
488
# session.
344
if (not client) or (not client.still_valid()):
345
if debug:
346
if client:
347
sys.stderr.write(u"Client %(name)s is invalid\n"
348
% vars(client))
349
else:
350
sys.stderr.write(u"Client not found for "
351
u"fingerprint: %s\n" % fpr)
489
if not client.still_valid():
490
logger.debug(u"Client %(name)s is invalid", vars(client))
352
491
session.bye()
353
492
return
354
493
sent_size = 0
355
494
while sent_size < len(client.secret):
356
495
sent = session.send(client.secret[sent_size:])
357
if debug:
358
sys.stderr.write(u"Sent: %d, remaining: %d\n"
359
% (sent, len(client.secret)
360
- (sent_size + sent)))
496
logger.debug(u"Sent: %d, remaining: %d",
497
sent, len(client.secret)
498
- (sent_size + sent))
361
499
sent_size += sent
362
500
session.bye()
363
501
365
503
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
504
"""IPv6 TCP server. Accepts 'None' as address and/or port.
367
505
Attributes:
368
options: Command line options
506
settings: Server settings
369
507
clients: Set() of Client objects
370
508
"""
371
509
address_family = socket.AF_INET6
372
510
def __init__(self, *args, **kwargs):
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
511
if "settings" in kwargs:
512
self.settings = kwargs["settings"]
513
del kwargs["settings"]
376
514
if "clients" in kwargs:
377
515
self.clients = kwargs["clients"]
378
516
del kwargs["clients"]
381
519
"""This overrides the normal server_bind() function
382
520
to bind to an interface if one was specified, and also NOT to
383
521
bind to an address or port if they were not specified."""
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
522
if self.settings["interface"]:
523
# 25 is from /usr/include/asm-i486/socket.h
524
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
388
525
try:
389
526
self.socket.setsockopt(socket.SOL_SOCKET,
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
527
SO_BINDTODEVICE,
528
self.settings["interface"])
392
529
except socket.error, error:
393
530
if error[0] == errno.EPERM:
394
sys.stderr.write(u"Warning: No permission to" \
395
u" bind to interface %s\n"
396
% self.options.interface)
531
logger.warning(u"No permission to"
532
u" bind to interface %s",
533
self.settings["interface"])
397
534
else:
398
535
raise error
399
536
# Only bind(2) the socket if we really need to.
442
579
return delta
443
580
444
581
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
if debug:
457
sys.stderr.write(u"Adding service '%s' of type '%s' ...\n"
458
% (serviceName, serviceType))
459
460
group.AddService(
461
serviceInterface, # interface
462
avahi.PROTO_INET6, # protocol
463
dbus.UInt32(0), # flags
464
serviceName, serviceType,
465
domain, host,
466
dbus.UInt16(servicePort),
467
avahi.string_array_to_txt_array(serviceTXT))
468
group.Commit()
469
470
471
def remove_service():
472
"""From the Avahi server example code"""
473
global group
474
475
if not group is None:
476
group.Reset()
477
478
479
582
def server_state_changed(state):
480
"""From the Avahi server example code"""
583
"""Derived from the Avahi example code"""
481
584
if state == avahi.SERVER_COLLISION:
482
sys.stderr.write(u"WARNING: Server name collision\n")
483
remove_service()
585
logger.warning(u"Server name collision")
586
service.remove()
484
587
elif state == avahi.SERVER_RUNNING:
485
add_service()
588
service.add()
486
589
487
590
488
591
def entry_group_state_changed(state, error):
489
"""From the Avahi server example code"""
490
global serviceName, server, rename_count
491
492
if debug:
493
sys.stderr.write(u"state change: %i\n" % state)
592
"""Derived from the Avahi example code"""
593
logger.debug(u"state change: %i", state)
494
594
495
595
if state == avahi.ENTRY_GROUP_ESTABLISHED:
496
if debug:
497
sys.stderr.write(u"Service established.\n")
596
logger.debug(u"Service established.")
498
597
elif state == avahi.ENTRY_GROUP_COLLISION:
499
500
rename_count = rename_count - 1
501
if rename_count > 0:
502
name = server.GetAlternativeServiceName(name)
503
sys.stderr.write(u"WARNING: Service name collision, "
504
u"changing name to '%s' ...\n" % name)
505
remove_service()
506
add_service()
507
508
else:
509
sys.stderr.write(u"ERROR: No suitable service name found "
510
u"after %i retries, exiting.\n"
511
% n_rename)
512
main_loop.quit()
598
logger.warning(u"Service name collision.")
599
service.rename()
513
600
elif state == avahi.ENTRY_GROUP_FAILURE:
514
sys.stderr.write(u"Error in group state changed %s\n"
515
% unicode(error))
516
main_loop.quit()
517
return
518
601
logger.critical(u"Error in group state changed %s",
602
unicode(error))
603
raise AvahiGroupError("State changed: %s", str(error))
519
604
520
605
def if_nametoindex(interface):
521
"""Call the C function if_nametoindex()"""
606
"""Call the C function if_nametoindex(), or equivalent"""
607
global if_nametoindex
522
608
try:
523
libc = ctypes.cdll.LoadLibrary("libc.so.6")
524
return libc.if_nametoindex(interface)
609
if "ctypes.util" not in sys.modules:
610
import ctypes.util
611
if_nametoindex = ctypes.cdll.LoadLibrary\
612
(ctypes.util.find_library("c")).if_nametoindex
525
613
except (OSError, AttributeError):
526
614
if "struct" not in sys.modules:
527
615
import struct
528
616
if "fcntl" not in sys.modules:
529
617
import fcntl
530
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
531
s = socket.socket()
532
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
533
struct.pack("16s16x", interface))
534
s.close()
535
interface_index = struct.unpack("I", ifreq[16:20])[0]
536
return interface_index
537
538
539
if __name__ == '__main__':
618
def if_nametoindex(interface):
619
"Get an interface index the hard way, i.e. using fcntl()"
620
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
621
s = socket.socket()
622
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
623
struct.pack("16s16x", interface))
624
s.close()
625
interface_index = struct.unpack("I", ifreq[16:20])[0]
626
return interface_index
627
return if_nametoindex(interface)
628
629
630
def daemon(nochdir, noclose):
631
"""See daemon(3). Standard BSD Unix function.
632
This should really exist as os.daemon, but it doesn't (yet)."""
633
if os.fork():
634
sys.exit()
635
os.setsid()
636
if not nochdir:
637
os.chdir("/")
638
if not noclose:
639
# Close all standard open file descriptors
640
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
641
if not stat.S_ISCHR(os.fstat(null).st_mode):
642
raise OSError(errno.ENODEV,
643
"/dev/null not a character device")
644
os.dup2(null, sys.stdin.fileno())
645
os.dup2(null, sys.stdout.fileno())
646
os.dup2(null, sys.stderr.fileno())
647
if null > 2:
648
os.close(null)
649
650
651
def main():
652
global main_loop_started
653
main_loop_started = False
654
540
655
parser = OptionParser()
541
656
parser.add_option("-i", "--interface", type="string",
542
default=None, metavar="IF",
543
help="Bind to interface IF")
544
parser.add_option("--cert", type="string", default="cert.pem",
545
metavar="FILE",
546
help="Public key certificate PEM file to use")
547
parser.add_option("--key", type="string", default="key.pem",
548
metavar="FILE",
549
help="Private key PEM file to use")
550
parser.add_option("--ca", type="string", default="ca.pem",
551
metavar="FILE",
552
help="Certificate Authority certificate PEM file to use")
553
parser.add_option("--crl", type="string", default="crl.pem",
554
metavar="FILE",
555
help="Certificate Revokation List PEM file to use")
556
parser.add_option("-p", "--port", type="int", default=None,
657
metavar="IF", help="Bind to interface IF")
658
parser.add_option("-a", "--address", type="string",
659
help="Address to listen for requests on")
660
parser.add_option("-p", "--port", type="int",
557
661
help="Port number to receive requests on")
558
parser.add_option("--timeout", type="string", # Parsed later
559
default="1h",
560
help="Amount of downtime allowed for clients")
561
parser.add_option("--interval", type="string", # Parsed later
562
default="5m",
563
help="How often to check that a client is up")
564
662
parser.add_option("--check", action="store_true", default=False,
565
663
help="Run self-test")
566
664
parser.add_option("--debug", action="store_true", default=False,
567
help="Debug mode")
665
help="Debug mode; run in foreground and log to"
666
" terminal")
667
parser.add_option("--priority", type="string", help="GnuTLS"
668
" priority string (see GnuTLS documentation)")
669
parser.add_option("--servicename", type="string", metavar="NAME",
670
help="Zeroconf service name")
671
parser.add_option("--configdir", type="string",
672
default="/etc/mandos", metavar="DIR",
673
help="Directory to search for configuration"
674
" files")
568
675
(options, args) = parser.parse_args()
569
676
570
677
if options.check:
572
679
doctest.testmod()
573
680
sys.exit()
574
681
575
# Parse the time arguments
576
try:
577
options.timeout = string_to_delta(options.timeout)
578
except ValueError:
579
parser.error("option --timeout: Unparseable time")
580
try:
581
options.interval = string_to_delta(options.interval)
582
except ValueError:
583
parser.error("option --interval: Unparseable time")
584
585
# Parse config file
586
defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
587
client_config = ConfigParser.SafeConfigParser(defaults)
588
#client_config.readfp(open("secrets.conf"), "secrets.conf")
589
client_config.read("mandos-clients.conf")
590
591
# From the Avahi server example code
682
# Default values for config file for server-global settings
683
server_defaults = { "interface": "",
684
"address": "",
685
"port": "",
686
"debug": "False",
687
"priority":
688
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
689
"servicename": "Mandos",
690
}
691
692
# Parse config file for server-global settings
693
server_config = ConfigParser.SafeConfigParser(server_defaults)
694
del server_defaults
695
server_config.read(os.path.join(options.configdir, "server.conf"))
696
server_section = "server"
697
# Convert the SafeConfigParser object to a dict
698
server_settings = dict(server_config.items(server_section))
699
# Use getboolean on the boolean config option
700
server_settings["debug"] = server_config.getboolean\
701
(server_section, "debug")
702
del server_config
703
704
# Override the settings from the config file with command line
705
# options, if set.
706
for option in ("interface", "address", "port", "debug",
707
"priority", "servicename", "configdir"):
708
value = getattr(options, option)
709
if value is not None:
710
server_settings[option] = value
711
del options
712
# Now we have our good server settings in "server_settings"
713
714
# Parse config file with clients
715
client_defaults = { "timeout": "1h",
716
"interval": "5m",
717
"checker": "fping -q -- %%(fqdn)s",
718
}
719
client_config = ConfigParser.SafeConfigParser(client_defaults)
720
client_config.read(os.path.join(server_settings["configdir"],
721
"clients.conf"))
722
723
global service
724
service = AvahiService(name = server_settings["servicename"],
725
type = "_mandos._tcp", );
726
if server_settings["interface"]:
727
service.interface = if_nametoindex(server_settings["interface"])
728
729
global main_loop
730
global bus
731
global server
732
# From the Avahi example code
592
733
DBusGMainLoop(set_as_default=True )
593
734
main_loop = gobject.MainLoop()
594
735
bus = dbus.SystemBus()
597
738
avahi.DBUS_INTERFACE_SERVER )
598
739
# End of Avahi example code
599
740
600
debug = options.debug
741
debug = server_settings["debug"]
742
743
if debug:
744
console = logging.StreamHandler()
745
# console.setLevel(logging.DEBUG)
746
console.setFormatter(logging.Formatter\
747
('%(levelname)s: %(message)s'))
748
logger.addHandler(console)
749
del console
601
750
602
751
clients = Set()
603
752
def remove_from_clients(client):
604
753
clients.remove(client)
605
754
if not clients:
606
if debug:
607
sys.stderr.write(u"No clients left, exiting\n")
608
main_loop.quit()
755
logger.debug(u"No clients left, exiting")
756
sys.exit()
609
757
610
clients.update(Set(Client(name=section, options=options,
758
clients.update(Set(Client(name=section,
611
759
stop_hook = remove_from_clients,
612
760
**(dict(client_config\
613
761
.items(section))))
614
762
for section in client_config.sections()))
763
764
if not debug:
765
daemon(False, False)
766
767
def cleanup():
768
"Cleanup function; run on exit"
769
global group
770
# From the Avahi example code
771
if not group is None:
772
group.Free()
773
group = None
774
# End of Avahi example code
775
776
while clients:
777
client = clients.pop()
778
client.stop_hook = None
779
client.stop()
780
781
atexit.register(cleanup)
782
783
if not debug:
784
signal.signal(signal.SIGINT, signal.SIG_IGN)
785
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
786
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
787
615
788
for client in clients:
616
789
client.start()
617
790
618
tcp_server = IPv6_TCPServer((None, options.port),
791
tcp_server = IPv6_TCPServer((server_settings["address"],
792
server_settings["port"]),
619
793
tcp_handler,
620
options=options,
794
settings=server_settings,
621
795
clients=clients)
622
# Find out what random port we got
623
servicePort = tcp_server.socket.getsockname()[1]
624
if debug:
625
sys.stderr.write(u"Now listening on port %d\n" % servicePort)
626
627
if options.interface is not None:
628
serviceInterface = if_nametoindex(options.interface)
629
630
# From the Avahi server example code
631
server.connect_to_signal("StateChanged", server_state_changed)
632
server_state_changed(server.GetState())
633
# End of Avahi example code
634
635
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
636
lambda *args, **kwargs:
637
tcp_server.handle_request(*args[2:],
638
**kwargs) or True)
796
# Find out what port we got
797
service.port = tcp_server.socket.getsockname()[1]
798
logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
799
u" scope_id %d" % tcp_server.socket.getsockname())
800
801
#service.interface = tcp_server.socket.getsockname()[3]
802
639
803
try:
804
# From the Avahi example code
805
server.connect_to_signal("StateChanged", server_state_changed)
806
try:
807
server_state_changed(server.GetState())
808
except dbus.exceptions.DBusException, error:
809
logger.critical(u"DBusException: %s", error)
810
sys.exit(1)
811
# End of Avahi example code
812
813
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
814
lambda *args, **kwargs:
815
tcp_server.handle_request\
816
(*args[2:], **kwargs) or True)
817
818
logger.debug("Starting main loop")
819
main_loop_started = True
640
820
main_loop.run()
821
except AvahiError, error:
822
logger.critical(u"AvahiError: %s" + unicode(error))
823
sys.exit(1)
641
824
except KeyboardInterrupt:
642
print
643
644
# Cleanup here
825
if debug:
826
print
645
827
646
# From the Avahi server example code
647
if not group is None:
648
group.Free()
649
# End of Avahi example code
650
651
for client in clients:
652
client.stop_hook = None
653
client.stop()
828
if __name__ == '__main__':
829
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0