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- Committer: Björn Påhlsson
- Date: 2008-08-04 22:46:32 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 46.
- Revision ID: belorn@braxen-20080804224632-k1v16lxkiryurd0n
mandosclient
segmentation fault bug fixed
segmentation fault bug fixed
- files added:
- server.conf
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- files modified:
- Makefile
added
removed
server.py
1
1
#!/usr/bin/python
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# -*- mode: python; coding: utf-8 -*-
3
#
4
# Mandos server - give out binary blobs to connecting clients.
5
#
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# 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",
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# "server_state_changed", "entry_group_state_changed", and some lines
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# in "main".
12
#
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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#
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# 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
import logging
32
import logging.handlers
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.
33
74
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
35
75
36
76
logger = logging.Logger('mandos')
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logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
38
39
# This variable is used to optionally bind to a specified interface.
40
# It is a global variable to fit in with the other variables from the
41
# Avahi server example code.
42
serviceInterface = avahi.IF_UNSPEC
43
# From the Avahi server example code:
44
serviceName = "Mandos"
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
46
servicePort = None # Not known at startup
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serviceTXT = [] # TXT record for the service
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domain = "" # Domain to publish on, default to .local
49
host = "" # Host to publish records for, default to localhost
50
group = None #our entry group
51
rename_count = 12 # Counter so we only rename after collisions a
52
# sensible number of times
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
"""An Avahi (Zeroconf) service.
100
Attributes:
101
interface: integer; avahi.IF_UNSPEC or an interface index.
102
Used to optionally bind to the specified interface.
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name: string; Example: 'Mandos'
104
type: string; Example: '_mandos._tcp'.
105
See <http://www.dns-sd.org/ServiceTypes.html>
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port: integer; what port to announce
107
TXT: list of strings; TXT record for the service
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domain: string; Domain to publish on, default to .local if empty.
109
host: string; Host to publish records for, default is localhost
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
self.interface = interface
118
self.name = name
119
self.type = type
120
self.port = port
121
if TXT is None:
122
self.TXT = []
123
else:
124
self.TXT = TXT
125
self.domain = domain
126
self.host = host
127
self.rename_count = 0
128
def rename(self):
129
"""Derived from the Avahi example code"""
130
if self.rename_count >= self.max_renames:
131
logger.critical(u"No suitable service name found after %i"
132
u" retries, exiting.", rename_count)
133
raise AvahiServiceError("Too many renames")
134
name = server.GetAlternativeServiceName(name)
135
logger.error(u"Changing name to %r ...", name)
136
self.remove()
137
self.add()
138
self.rename_count += 1
139
def remove(self):
140
"""Derived from the Avahi example code"""
141
if group is not None:
142
group.Reset()
143
def add(self):
144
"""Derived from the Avahi example code"""
145
global group
146
if group is None:
147
group = dbus.Interface\
148
(bus.get_object(avahi.DBUS_NAME,
149
server.EntryGroupNew()),
150
avahi.DBUS_INTERFACE_ENTRY_GROUP)
151
group.connect_to_signal('StateChanged',
152
entry_group_state_changed)
153
logger.debug(u"Adding service '%s' of type '%s' ...",
154
service.name, service.type)
155
group.AddService(
156
self.interface, # interface
157
avahi.PROTO_INET6, # protocol
158
dbus.UInt32(0), # flags
159
self.name, self.type,
160
self.domain, self.host,
161
dbus.UInt16(self.port),
162
avahi.string_array_to_txt_array(self.TXT))
163
group.Commit()
164
165
# From the Avahi example code:
166
group = None # our entry group
53
167
# End of Avahi example code
54
168
55
169
61
175
uniquely identify the client
62
176
secret: bytestring; sent verbatim (over TLS) to client
63
177
fqdn: string (FQDN); available for use by the checker command
64
created: datetime.datetime()
65
last_seen: datetime.datetime() or None if not yet seen
66
timeout: datetime.timedelta(); How long from last_seen until
67
this client is invalid
178
created: datetime.datetime(); object creation, not client host
179
last_checked_ok: datetime.datetime() or None if not yet checked OK
180
timeout: datetime.timedelta(); How long from last_checked_ok
181
until this client is invalid
68
182
interval: datetime.timedelta(); How often to start a new checker
69
183
stop_hook: If set, called by stop() as stop_hook(self)
70
184
checker: subprocess.Popen(); a running checker process used
71
185
to see if the client lives.
72
Is None if no process is running.
186
'None' if no process is running.
73
187
checker_initiator_tag: a gobject event source tag, or None
74
188
stop_initiator_tag: - '' -
75
189
checker_callback_tag: - '' -
76
190
checker_command: string; External command which is run to check if
77
client lives. %()s expansions are done at
191
client lives. %() expansions are done at
78
192
runtime with vars(self) as dict, so that for
79
193
instance %(name)s can be used in the command.
80
194
Private attibutes:
81
195
_timeout: Real variable for 'timeout'
82
196
_interval: Real variable for 'interval'
83
_timeout_milliseconds: Used by gobject.timeout_add()
197
_timeout_milliseconds: Used when calling gobject.timeout_add()
84
198
_interval_milliseconds: - '' -
85
199
"""
86
200
def _set_timeout(self, timeout):
106
220
interval = property(lambda self: self._interval,
107
221
_set_interval)
108
222
del _set_interval
109
def __init__(self, name=None, options=None, stop_hook=None,
110
fingerprint=None, secret=None, secfile=None, fqdn=None,
111
timeout=None, interval=-1, checker=None):
223
def __init__(self, name = None, stop_hook=None, config={}):
224
"""Note: the 'checker' key in 'config' sets the
225
'checker_command' attribute and *not* the 'checker'
226
attribute."""
112
227
self.name = name
113
# Uppercase and remove spaces from fingerprint
114
# for later comparison purposes with return value of
115
# the fingerprint() function
116
self.fingerprint = fingerprint.upper().replace(u" ", u"")
117
if secret:
118
self.secret = secret.decode(u"base64")
119
elif secfile:
120
sf = open(secfile)
228
logger.debug(u"Creating client %r", self.name)
229
# Uppercase and remove spaces from fingerprint for later
230
# comparison purposes with return value from the fingerprint()
231
# function
232
self.fingerprint = config["fingerprint"].upper()\
233
.replace(u" ", u"")
234
logger.debug(u" Fingerprint: %s", self.fingerprint)
235
if "secret" in config:
236
self.secret = config["secret"].decode(u"base64")
237
elif "secfile" in config:
238
sf = open(config["secfile"])
121
239
self.secret = sf.read()
122
240
sf.close()
123
241
else:
124
raise RuntimeError(u"No secret or secfile for client %s"
125
% self.name)
126
self.fqdn = fqdn # string
242
raise TypeError(u"No secret or secfile for client %s"
243
% self.name)
244
self.fqdn = config.get("fqdn", "")
127
245
self.created = datetime.datetime.now()
128
self.last_seen = None
129
if timeout is None:
130
timeout = options.timeout
131
self.timeout = timeout
132
if interval == -1:
133
interval = options.interval
134
else:
135
interval = string_to_delta(interval)
136
self.interval = interval
246
self.last_checked_ok = None
247
self.timeout = string_to_delta(config["timeout"])
248
self.interval = string_to_delta(config["interval"])
137
249
self.stop_hook = stop_hook
138
250
self.checker = None
139
251
self.checker_initiator_tag = None
140
252
self.stop_initiator_tag = None
141
253
self.checker_callback_tag = None
142
self.check_command = checker
254
self.check_command = config["checker"]
143
255
def start(self):
144
"""Start this clients checker and timeout hooks"""
256
"""Start this client's checker and timeout hooks"""
145
257
# Schedule a new checker to be started an 'interval' from now,
146
258
# and every interval from then on.
147
259
self.checker_initiator_tag = gobject.timeout_add\
155
267
self.stop)
156
268
def stop(self):
157
269
"""Stop this client.
158
The possibility that this client might be restarted is left
159
open, but not currently used."""
160
logger.debug(u"Stopping client %s", self.name)
161
self.secret = None
162
if self.stop_initiator_tag:
270
The possibility that a client might be restarted is left open,
271
but not currently used."""
272
# If this client doesn't have a secret, it is already stopped.
273
if self.secret:
274
logger.info(u"Stopping client %s", self.name)
275
self.secret = None
276
else:
277
return False
278
if getattr(self, "stop_initiator_tag", False):
163
279
gobject.source_remove(self.stop_initiator_tag)
164
280
self.stop_initiator_tag = None
165
if self.checker_initiator_tag:
281
if getattr(self, "checker_initiator_tag", False):
166
282
gobject.source_remove(self.checker_initiator_tag)
167
283
self.checker_initiator_tag = None
168
284
self.stop_checker()
171
287
# Do not run this again if called by a gobject.timeout_add
172
288
return False
173
289
def __del__(self):
174
# Some code duplication here and in stop()
175
if hasattr(self, "stop_initiator_tag") \
176
and self.stop_initiator_tag:
177
gobject.source_remove(self.stop_initiator_tag)
178
self.stop_initiator_tag = None
179
if hasattr(self, "checker_initiator_tag") \
180
and self.checker_initiator_tag:
181
gobject.source_remove(self.checker_initiator_tag)
182
self.checker_initiator_tag = None
183
self.stop_checker()
290
self.stop_hook = None
291
self.stop()
184
292
def checker_callback(self, pid, condition):
185
293
"""The checker has completed, so take appropriate actions."""
186
294
now = datetime.datetime.now()
295
self.checker_callback_tag = None
296
self.checker = None
187
297
if os.WIFEXITED(condition) \
188
298
and (os.WEXITSTATUS(condition) == 0):
189
logger.debug(u"Checker for %(name)s succeeded",
190
vars(self))
191
self.last_seen = now
299
logger.info(u"Checker for %(name)s succeeded",
300
vars(self))
301
self.last_checked_ok = now
192
302
gobject.source_remove(self.stop_initiator_tag)
193
303
self.stop_initiator_tag = gobject.timeout_add\
194
304
(self._timeout_milliseconds,
195
305
self.stop)
196
if not os.WIFEXITED(condition):
306
elif not os.WIFEXITED(condition):
197
307
logger.warning(u"Checker for %(name)s crashed?",
198
308
vars(self))
199
309
else:
200
logger.debug(u"Checker for %(name)s failed",
201
vars(self))
202
self.checker = None
203
self.checker_callback_tag = None
310
logger.info(u"Checker for %(name)s failed",
311
vars(self))
204
312
def start_checker(self):
205
313
"""Start a new checker subprocess if one is not running.
206
314
If a checker already exists, leave it running and do
207
315
nothing."""
316
# The reason for not killing a running checker is that if we
317
# did that, then if a checker (for some reason) started
318
# running slowly and taking more than 'interval' time, the
319
# client would inevitably timeout, since no checker would get
320
# a chance to run to completion. If we instead leave running
321
# checkers alone, the checker would have to take more time
322
# than 'timeout' for the client to be declared invalid, which
323
# is as it should be.
208
324
if self.checker is None:
209
logger.debug(u"Starting checker for %s",
210
self.name)
211
325
try:
326
# In case check_command has exactly one % operator
212
327
command = self.check_command % self.fqdn
213
328
except TypeError:
329
# Escape attributes for the shell
214
330
escaped_attrs = dict((key, re.escape(str(val)))
215
331
for key, val in
216
332
vars(self).iteritems())
217
333
try:
218
334
command = self.check_command % escaped_attrs
219
335
except TypeError, error:
220
logger.critical(u'Could not format string "%s": %s',
221
self.check_command, error)
336
logger.error(u'Could not format string "%s":'
337
u' %s', self.check_command, error)
222
338
return True # Try again later
223
339
try:
224
self.checker = subprocess.\
225
Popen(command,
226
stdout=subprocess.PIPE,
227
close_fds=True, shell=True,
228
cwd="/")
229
self.checker_callback_tag = gobject.\
230
child_watch_add(self.checker.pid,
231
self.\
232
checker_callback)
340
logger.info(u"Starting checker %r for %s",
341
command, self.name)
342
self.checker = subprocess.Popen(command,
343
close_fds=True,
344
shell=True, cwd="/")
345
self.checker_callback_tag = gobject.child_watch_add\
346
(self.checker.pid,
347
self.checker_callback)
233
348
except subprocess.OSError, error:
234
349
logger.error(u"Failed to start subprocess: %s",
235
350
error)
237
352
return True
238
353
def stop_checker(self):
239
354
"""Force the checker process, if any, to stop."""
240
if not hasattr(self, "checker") or self.checker is None:
355
if self.checker_callback_tag:
356
gobject.source_remove(self.checker_callback_tag)
357
self.checker_callback_tag = None
358
if getattr(self, "checker", None) is None:
241
359
return
242
gobject.source_remove(self.checker_callback_tag)
243
self.checker_callback_tag = None
244
os.kill(self.checker.pid, signal.SIGTERM)
245
if self.checker.poll() is None:
246
os.kill(self.checker.pid, signal.SIGKILL)
360
logger.debug("Stopping checker for %(name)s", vars(self))
361
try:
362
os.kill(self.checker.pid, signal.SIGTERM)
363
#os.sleep(0.5)
364
#if self.checker.poll() is None:
365
# os.kill(self.checker.pid, signal.SIGKILL)
366
except OSError, error:
367
if error.errno != errno.ESRCH: # No such process
368
raise
247
369
self.checker = None
248
def still_valid(self, now=None):
370
def still_valid(self):
249
371
"""Has the timeout not yet passed for this client?"""
250
if now is None:
251
now = datetime.datetime.now()
252
if self.last_seen is None:
372
now = datetime.datetime.now()
373
if self.last_checked_ok is None:
253
374
return now < (self.created + self.timeout)
254
375
else:
255
return now < (self.last_seen + self.timeout)
376
return now < (self.last_checked_ok + self.timeout)
256
377
257
378
258
379
def peer_certificate(session):
380
"Return the peer's OpenPGP certificate as a bytestring"
259
381
# If not an OpenPGP certificate...
260
382
if gnutls.library.functions.gnutls_certificate_type_get\
261
383
(session._c_object) \
272
394
273
395
274
396
def fingerprint(openpgp):
275
# New empty GnuTLS certificate
276
crt = gnutls.library.types.gnutls_openpgp_crt_t()
277
gnutls.library.functions.gnutls_openpgp_crt_init\
278
(ctypes.byref(crt))
397
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
279
398
# New GnuTLS "datum" with the OpenPGP public key
280
399
datum = gnutls.library.types.gnutls_datum_t\
281
400
(ctypes.cast(ctypes.c_char_p(openpgp),
282
401
ctypes.POINTER(ctypes.c_ubyte)),
283
402
ctypes.c_uint(len(openpgp)))
403
# New empty GnuTLS certificate
404
crt = gnutls.library.types.gnutls_openpgp_crt_t()
405
gnutls.library.functions.gnutls_openpgp_crt_init\
406
(ctypes.byref(crt))
284
407
# Import the OpenPGP public key into the certificate
285
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
(crt,
287
ctypes.byref(datum),
288
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
gnutls.library.functions.gnutls_openpgp_crt_import\
409
(crt, ctypes.byref(datum),
410
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
289
411
# New buffer for the fingerprint
290
412
buffer = ctypes.create_string_buffer(20)
291
413
buffer_length = ctypes.c_size_t()
307
429
Note: This will run in its own forked process."""
308
430
309
431
def handle(self):
310
logger.debug(u"TCP connection from: %s",
432
logger.info(u"TCP connection from: %s",
311
433
unicode(self.client_address))
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
434
session = gnutls.connection.ClientSession\
435
(self.request, gnutls.connection.X509Credentials())
436
437
line = self.request.makefile().readline()
438
logger.debug(u"Protocol version: %r", line)
439
try:
440
if int(line.strip().split()[0]) > 1:
441
raise RuntimeError
442
except (ValueError, IndexError, RuntimeError), error:
443
logger.error(u"Unknown protocol version: %s", error)
444
return
445
446
# Note: gnutls.connection.X509Credentials is really a generic
447
# GnuTLS certificate credentials object so long as no X.509
448
# keys are added to it. Therefore, we can use it here despite
449
# using OpenPGP certificates.
315
450
316
451
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
317
452
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
318
453
# "+DHE-DSS"))
319
priority = "SECURE256"
320
454
priority = "NORMAL" # Fallback default, since this
455
# MUST be set.
456
if self.server.settings["priority"]:
457
priority = self.server.settings["priority"]
321
458
gnutls.library.functions.gnutls_priority_set_direct\
322
459
(session._c_object, priority, None);
323
460
324
461
try:
325
462
session.handshake()
326
463
except gnutls.errors.GNUTLSError, error:
327
logger.debug(u"Handshake failed: %s", error)
464
logger.warning(u"Handshake failed: %s", error)
328
465
# Do not run session.bye() here: the session is not
329
466
# established. Just abandon the request.
330
467
return
331
468
try:
332
469
fpr = fingerprint(peer_certificate(session))
333
470
except (TypeError, gnutls.errors.GNUTLSError), error:
334
logger.debug(u"Bad certificate: %s", error)
471
logger.warning(u"Bad certificate: %s", error)
335
472
session.bye()
336
473
return
337
474
logger.debug(u"Fingerprint: %s", fpr)
338
475
client = None
339
for c in clients:
476
for c in self.server.clients:
340
477
if c.fingerprint == fpr:
341
478
client = c
342
479
break
480
if not client:
481
logger.warning(u"Client not found for fingerprint: %s",
482
fpr)
483
session.bye()
484
return
343
485
# Have to check if client.still_valid(), since it is possible
344
486
# that the client timed out while establishing the GnuTLS
345
487
# session.
346
if (not client) or (not client.still_valid()):
347
if client:
348
logger.debug(u"Client %(name)s is invalid",
349
vars(client))
350
else:
351
logger.debug(u"Client not found for fingerprint: %s",
352
fpr)
488
if not client.still_valid():
489
logger.warning(u"Client %(name)s is invalid",
490
vars(client))
353
491
session.bye()
354
492
return
355
493
sent_size = 0
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
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
531
logger.error(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
logger.debug(u"Adding service '%s' of type '%s' ...",
457
serviceName, serviceType)
458
459
group.AddService(
460
serviceInterface, # interface
461
avahi.PROTO_INET6, # protocol
462
dbus.UInt32(0), # flags
463
serviceName, serviceType,
464
domain, host,
465
dbus.UInt16(servicePort),
466
avahi.string_array_to_txt_array(serviceTXT))
467
group.Commit()
468
469
470
def remove_service():
471
"""From the Avahi server example code"""
472
global group
473
474
if not group is None:
475
group.Reset()
476
477
478
582
def server_state_changed(state):
479
"""From the Avahi server example code"""
583
"""Derived from the Avahi example code"""
480
584
if state == avahi.SERVER_COLLISION:
481
logger.warning(u"Server name collision")
482
remove_service()
585
logger.error(u"Server name collision")
586
service.remove()
483
587
elif state == avahi.SERVER_RUNNING:
484
add_service()
588
service.add()
485
589
486
590
487
591
def entry_group_state_changed(state, error):
488
"""From the Avahi server example code"""
489
global serviceName, server, rename_count
490
592
"""Derived from the Avahi example code"""
491
593
logger.debug(u"state change: %i", state)
492
594
493
595
if state == avahi.ENTRY_GROUP_ESTABLISHED:
494
596
logger.debug(u"Service established.")
495
597
elif state == avahi.ENTRY_GROUP_COLLISION:
496
497
rename_count = rename_count - 1
498
if rename_count > 0:
499
name = server.GetAlternativeServiceName(name)
500
logger.warning(u"Service name collision, "
501
u"changing name to '%s' ...", name)
502
remove_service()
503
add_service()
504
505
else:
506
logger.error(u"No suitable service name found "
507
u"after %i retries, exiting.",
508
n_rename)
509
main_loop.quit()
598
logger.warning(u"Service name collision.")
599
service.rename()
510
600
elif state == avahi.ENTRY_GROUP_FAILURE:
511
logger.error(u"Error in group state changed %s",
512
unicode(error))
513
main_loop.quit()
514
return
515
601
logger.critical(u"Error in group state changed %s",
602
unicode(error))
603
raise AvahiGroupError("State changed: %s", str(error))
516
604
517
605
def if_nametoindex(interface):
518
"""Call the C function if_nametoindex()"""
606
"""Call the C function if_nametoindex(), or equivalent"""
607
global if_nametoindex
519
608
try:
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
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
522
613
except (OSError, AttributeError):
523
614
if "struct" not in sys.modules:
524
615
import struct
525
616
if "fcntl" not in sys.modules:
526
617
import fcntl
527
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
528
s = socket.socket()
529
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
530
struct.pack("16s16x", interface))
531
s.close()
532
interface_index = struct.unpack("I", ifreq[16:20])[0]
533
return interface_index
534
535
536
if __name__ == '__main__':
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
537
655
parser = OptionParser()
538
656
parser.add_option("-i", "--interface", type="string",
539
default=None, metavar="IF",
540
help="Bind to interface IF")
541
parser.add_option("--cert", type="string", default="cert.pem",
542
metavar="FILE",
543
help="Public key certificate PEM file to use")
544
parser.add_option("--key", type="string", default="key.pem",
545
metavar="FILE",
546
help="Private key PEM file to use")
547
parser.add_option("--ca", type="string", default="ca.pem",
548
metavar="FILE",
549
help="Certificate Authority certificate PEM file to use")
550
parser.add_option("--crl", type="string", default="crl.pem",
551
metavar="FILE",
552
help="Certificate Revokation List PEM file to use")
553
parser.add_option("-p", "--port", type="int", default=None,
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",
554
661
help="Port number to receive requests on")
555
parser.add_option("--timeout", type="string", # Parsed later
556
default="1h",
557
help="Amount of downtime allowed for clients")
558
parser.add_option("--interval", type="string", # Parsed later
559
default="5m",
560
help="How often to check that a client is up")
561
662
parser.add_option("--check", action="store_true", default=False,
562
663
help="Run self-test")
563
664
parser.add_option("--debug", action="store_true", default=False,
564
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")
565
675
(options, args) = parser.parse_args()
566
676
567
677
if options.check:
569
679
doctest.testmod()
570
680
sys.exit()
571
681
572
# Parse the time arguments
573
try:
574
options.timeout = string_to_delta(options.timeout)
575
except ValueError:
576
parser.error("option --timeout: Unparseable time")
577
try:
578
options.interval = string_to_delta(options.interval)
579
except ValueError:
580
parser.error("option --interval: Unparseable time")
581
582
# Parse config file
583
defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
584
client_config = ConfigParser.SafeConfigParser(defaults)
585
#client_config.readfp(open("secrets.conf"), "secrets.conf")
586
client_config.read("mandos-clients.conf")
587
588
# From the Avahi server example code
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
589
733
DBusGMainLoop(set_as_default=True )
590
734
main_loop = gobject.MainLoop()
591
735
bus = dbus.SystemBus()
594
738
avahi.DBUS_INTERFACE_SERVER )
595
739
# End of Avahi example code
596
740
597
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
598
750
599
751
clients = Set()
600
752
def remove_from_clients(client):
601
753
clients.remove(client)
602
754
if not clients:
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
755
logger.critical(u"No clients left, exiting")
756
sys.exit()
605
757
606
clients.update(Set(Client(name=section, options=options,
758
clients.update(Set(Client(name = section,
607
759
stop_hook = remove_from_clients,
608
**(dict(client_config\
609
.items(section))))
760
config
761
= dict(client_config.items(section)))
610
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
611
788
for client in clients:
612
789
client.start()
613
790
614
tcp_server = IPv6_TCPServer((None, options.port),
791
tcp_server = IPv6_TCPServer((server_settings["address"],
792
server_settings["port"]),
615
793
tcp_handler,
616
options=options,
794
settings=server_settings,
617
795
clients=clients)
618
# Find out what random port we got
619
servicePort = tcp_server.socket.getsockname()[1]
620
logger.debug(u"Now listening on port %d", servicePort)
621
622
if options.interface is not None:
623
serviceInterface = if_nametoindex(options.interface)
624
625
# From the Avahi server example code
626
server.connect_to_signal("StateChanged", server_state_changed)
627
server_state_changed(server.GetState())
628
# End of Avahi example code
629
630
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
631
lambda *args, **kwargs:
632
tcp_server.handle_request(*args[2:],
633
**kwargs) or True)
796
# Find out what port we got
797
service.port = tcp_server.socket.getsockname()[1]
798
logger.info(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
634
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
635
820
main_loop.run()
821
except AvahiError, error:
822
logger.critical(u"AvahiError: %s" + unicode(error))
823
sys.exit(1)
636
824
except KeyboardInterrupt:
637
print
638
639
# Cleanup here
825
if debug:
826
print
640
827
641
# From the Avahi server example code
642
if not group is None:
643
group.Free()
644
# End of Avahi example code
645
646
for client in clients:
647
client.stop_hook = None
648
client.stop()
828
if __name__ == '__main__':
829
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0