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- Committer: Björn Påhlsson
- Date: 2008-07-20 03:51:41 UTC
- Revision ID: belorn@braxen-20080720035141-ta0y0be7fotdm4ks
Fixed a overbufferflow bug, thanks to a forgotten \0
- files added:
- ca.pem
- files removed:
- initramfs-tools-hook
- files renamed:
- clients.conf => mandos-clients.conf
- mandos-client.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
1
1
#!/usr/bin/python
2
# -*- mode: python; coding: utf-8 -*-
3
#
4
# Mandos server - give out binary blobs to connecting clients.
5
#
6
# This program is partly derived from an example program for an Avahi
7
# service publisher, downloaded from
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add" and "remove" in the "AvahiService" class, the
10
# "server_state_changed" and "entry_group_state_changed" functions,
11
# and some lines 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
#
31
2
32
3
from __future__ import division
33
4
50
21
import signal
51
22
from sets import Set
52
23
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
57
24
58
25
import dbus
59
26
import gobject
61
28
from dbus.mainloop.glib import DBusGMainLoop
62
29
import ctypes
63
30
64
version = "1.0"
31
import logging
32
import logging.handlers
33
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
65
35
66
36
logger = logging.Logger('mandos')
67
syslogger = logging.handlers.SysLogHandler\
68
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
address = "/dev/log")
70
syslogger.setFormatter(logging.Formatter\
71
('Mandos: %(levelname)s: %(message)s'))
72
logger.addHandler(syslogger)
73
74
console = logging.StreamHandler()
75
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
' %(message)s'))
77
logger.addHandler(console)
78
79
class AvahiError(Exception):
80
def __init__(self, value):
81
self.value = value
82
def __str__(self):
83
return repr(self.value)
84
85
class AvahiServiceError(AvahiError):
86
pass
87
88
class AvahiGroupError(AvahiError):
89
pass
90
91
92
class AvahiService(object):
93
"""An Avahi (Zeroconf) service.
94
Attributes:
95
interface: integer; avahi.IF_UNSPEC or an interface index.
96
Used to optionally bind to the specified interface.
97
name: string; Example: 'Mandos'
98
type: string; Example: '_mandos._tcp'.
99
See <http://www.dns-sd.org/ServiceTypes.html>
100
port: integer; what port to announce
101
TXT: list of strings; TXT record for the service
102
domain: string; Domain to publish on, default to .local if empty.
103
host: string; Host to publish records for, default is localhost
104
max_renames: integer; maximum number of renames
105
rename_count: integer; counter so we only rename after collisions
106
a sensible number of times
107
"""
108
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
type = None, port = None, TXT = None, domain = "",
110
host = "", max_renames = 32768):
111
self.interface = interface
112
self.name = name
113
self.type = type
114
self.port = port
115
if TXT is None:
116
self.TXT = []
117
else:
118
self.TXT = TXT
119
self.domain = domain
120
self.host = host
121
self.rename_count = 0
122
def rename(self):
123
"""Derived from the Avahi example code"""
124
if self.rename_count >= self.max_renames:
125
logger.critical(u"No suitable service name found after %i"
126
u" retries, exiting.", rename_count)
127
raise AvahiServiceError("Too many renames")
128
name = server.GetAlternativeServiceName(name)
129
logger.error(u"Changing name to %r ...", name)
130
syslogger.setFormatter(logging.Formatter\
131
('Mandos (%s): %%(levelname)s:'
132
' %%(message)s' % name))
133
self.remove()
134
self.add()
135
self.rename_count += 1
136
def remove(self):
137
"""Derived from the Avahi example code"""
138
if group is not None:
139
group.Reset()
140
def add(self):
141
"""Derived from the Avahi example code"""
142
global group
143
if group is None:
144
group = dbus.Interface\
145
(bus.get_object(avahi.DBUS_NAME,
146
server.EntryGroupNew()),
147
avahi.DBUS_INTERFACE_ENTRY_GROUP)
148
group.connect_to_signal('StateChanged',
149
entry_group_state_changed)
150
logger.debug(u"Adding service '%s' of type '%s' ...",
151
service.name, service.type)
152
group.AddService(
153
self.interface, # interface
154
avahi.PROTO_INET6, # protocol
155
dbus.UInt32(0), # flags
156
self.name, self.type,
157
self.domain, self.host,
158
dbus.UInt16(self.port),
159
avahi.string_array_to_txt_array(self.TXT))
160
group.Commit()
161
162
# From the Avahi example code:
163
group = None # our entry group
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
38
39
# This variable is used to optionally bind to a specified interface.
40
# It is a global variable to fit in with the other variables from the
41
# Avahi server example code.
42
serviceInterface = avahi.IF_UNSPEC
43
# From the Avahi server example code:
44
serviceName = "Mandos"
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
46
servicePort = None # Not known at startup
47
serviceTXT = [] # TXT record for the service
48
domain = "" # Domain to publish on, default to .local
49
host = "" # Host to publish records for, default to localhost
50
group = None #our entry group
51
rename_count = 12 # Counter so we only rename after collisions a
52
# sensible number of times
164
53
# End of Avahi example code
165
54
166
55
171
60
fingerprint: string (40 or 32 hexadecimal digits); used to
172
61
uniquely identify the client
173
62
secret: bytestring; sent verbatim (over TLS) to client
174
host: string; available for use by the checker command
175
created: datetime.datetime(); object creation, not client host
176
last_checked_ok: datetime.datetime() or None if not yet checked OK
177
timeout: datetime.timedelta(); How long from last_checked_ok
178
until this client is invalid
63
fqdn: string (FQDN); available for use by the checker command
64
created: datetime.datetime()
65
last_seen: datetime.datetime() or None if not yet seen
66
timeout: datetime.timedelta(); How long from last_seen until
67
this client is invalid
179
68
interval: datetime.timedelta(); How often to start a new checker
180
69
stop_hook: If set, called by stop() as stop_hook(self)
181
70
checker: subprocess.Popen(); a running checker process used
182
71
to see if the client lives.
183
'None' if no process is running.
72
Is None if no process is running.
184
73
checker_initiator_tag: a gobject event source tag, or None
185
74
stop_initiator_tag: - '' -
186
75
checker_callback_tag: - '' -
187
76
checker_command: string; External command which is run to check if
188
client lives. %() expansions are done at
77
client lives. %()s expansions are done at
189
78
runtime with vars(self) as dict, so that for
190
79
instance %(name)s can be used in the command.
191
80
Private attibutes:
192
81
_timeout: Real variable for 'timeout'
193
82
_interval: Real variable for 'interval'
194
_timeout_milliseconds: Used when calling gobject.timeout_add()
83
_timeout_milliseconds: Used by gobject.timeout_add()
195
84
_interval_milliseconds: - '' -
196
85
"""
197
86
def _set_timeout(self, timeout):
217
106
interval = property(lambda self: self._interval,
218
107
_set_interval)
219
108
del _set_interval
220
def __init__(self, name = None, stop_hook=None, config={}):
221
"""Note: the 'checker' key in 'config' sets the
222
'checker_command' attribute and *not* the 'checker'
223
attribute."""
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):
224
112
self.name = name
225
logger.debug(u"Creating client %r", self.name)
226
# Uppercase and remove spaces from fingerprint for later
227
# comparison purposes with return value from the fingerprint()
228
# function
229
self.fingerprint = config["fingerprint"].upper()\
230
.replace(u" ", u"")
231
logger.debug(u" Fingerprint: %s", self.fingerprint)
232
if "secret" in config:
233
self.secret = config["secret"].decode(u"base64")
234
elif "secfile" in config:
235
sf = open(config["secfile"])
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)
236
121
self.secret = sf.read()
237
122
sf.close()
238
123
else:
239
raise TypeError(u"No secret or secfile for client %s"
240
% self.name)
241
self.host = config.get("host", "")
124
raise RuntimeError(u"No secret or secfile for client %s"
125
% self.name)
126
self.fqdn = fqdn # string
242
127
self.created = datetime.datetime.now()
243
self.last_checked_ok = None
244
self.timeout = string_to_delta(config["timeout"])
245
self.interval = string_to_delta(config["interval"])
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
137
self.stop_hook = stop_hook
247
138
self.checker = None
248
139
self.checker_initiator_tag = None
249
140
self.stop_initiator_tag = None
250
141
self.checker_callback_tag = None
251
self.check_command = config["checker"]
142
self.check_command = checker
252
143
def start(self):
253
"""Start this client's checker and timeout hooks"""
144
"""Start this clients checker and timeout hooks"""
254
145
# Schedule a new checker to be started an 'interval' from now,
255
146
# and every interval from then on.
256
147
self.checker_initiator_tag = gobject.timeout_add\
264
155
self.stop)
265
156
def stop(self):
266
157
"""Stop this client.
267
The possibility that a client might be restarted is left open,
268
but not currently used."""
269
# If this client doesn't have a secret, it is already stopped.
270
if hasattr(self, "secret") and self.secret:
271
logger.info(u"Stopping client %s", self.name)
272
self.secret = None
273
else:
274
return False
275
if getattr(self, "stop_initiator_tag", False):
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:
276
163
gobject.source_remove(self.stop_initiator_tag)
277
164
self.stop_initiator_tag = None
278
if getattr(self, "checker_initiator_tag", False):
165
if self.checker_initiator_tag:
279
166
gobject.source_remove(self.checker_initiator_tag)
280
167
self.checker_initiator_tag = None
281
168
self.stop_checker()
284
171
# Do not run this again if called by a gobject.timeout_add
285
172
return False
286
173
def __del__(self):
287
self.stop_hook = None
288
self.stop()
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()
289
184
def checker_callback(self, pid, condition):
290
185
"""The checker has completed, so take appropriate actions."""
291
186
now = datetime.datetime.now()
292
self.checker_callback_tag = None
293
self.checker = None
294
187
if os.WIFEXITED(condition) \
295
188
and (os.WEXITSTATUS(condition) == 0):
296
logger.info(u"Checker for %(name)s succeeded",
297
vars(self))
298
self.last_checked_ok = now
189
logger.debug(u"Checker for %(name)s succeeded",
190
vars(self))
191
self.last_seen = now
299
192
gobject.source_remove(self.stop_initiator_tag)
300
193
self.stop_initiator_tag = gobject.timeout_add\
301
194
(self._timeout_milliseconds,
302
195
self.stop)
303
elif not os.WIFEXITED(condition):
196
if not os.WIFEXITED(condition):
304
197
logger.warning(u"Checker for %(name)s crashed?",
305
198
vars(self))
306
199
else:
307
logger.info(u"Checker for %(name)s failed",
308
vars(self))
200
logger.debug(u"Checker for %(name)s failed",
201
vars(self))
202
self.checker = None
203
self.checker_callback_tag = None
309
204
def start_checker(self):
310
205
"""Start a new checker subprocess if one is not running.
311
206
If a checker already exists, leave it running and do
312
207
nothing."""
313
# The reason for not killing a running checker is that if we
314
# did that, then if a checker (for some reason) started
315
# running slowly and taking more than 'interval' time, the
316
# client would inevitably timeout, since no checker would get
317
# a chance to run to completion. If we instead leave running
318
# checkers alone, the checker would have to take more time
319
# than 'timeout' for the client to be declared invalid, which
320
# is as it should be.
321
208
if self.checker is None:
209
logger.debug(u"Starting checker for %s",
210
self.name)
322
211
try:
323
# In case check_command has exactly one % operator
324
command = self.check_command % self.host
212
command = self.check_command % self.fqdn
325
213
except TypeError:
326
# Escape attributes for the shell
327
214
escaped_attrs = dict((key, re.escape(str(val)))
328
215
for key, val in
329
216
vars(self).iteritems())
330
217
try:
331
218
command = self.check_command % escaped_attrs
332
219
except TypeError, error:
333
logger.error(u'Could not format string "%s":'
334
u' %s', self.check_command, error)
220
logger.critical(u'Could not format string "%s": %s',
221
self.check_command, error)
335
222
return True # Try again later
336
223
try:
337
logger.info(u"Starting checker %r for %s",
338
command, self.name)
339
self.checker = subprocess.Popen(command,
340
close_fds=True,
341
shell=True, cwd="/")
342
self.checker_callback_tag = gobject.child_watch_add\
343
(self.checker.pid,
344
self.checker_callback)
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)
345
233
except subprocess.OSError, error:
346
234
logger.error(u"Failed to start subprocess: %s",
347
235
error)
349
237
return True
350
238
def stop_checker(self):
351
239
"""Force the checker process, if any, to stop."""
352
if self.checker_callback_tag:
353
gobject.source_remove(self.checker_callback_tag)
354
self.checker_callback_tag = None
355
if getattr(self, "checker", None) is None:
240
if not hasattr(self, "checker") or self.checker is None:
356
241
return
357
logger.debug(u"Stopping checker for %(name)s", vars(self))
358
try:
359
os.kill(self.checker.pid, signal.SIGTERM)
360
#os.sleep(0.5)
361
#if self.checker.poll() is None:
362
# os.kill(self.checker.pid, signal.SIGKILL)
363
except OSError, error:
364
if error.errno != errno.ESRCH: # No such process
365
raise
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)
366
247
self.checker = None
367
def still_valid(self):
248
def still_valid(self, now=None):
368
249
"""Has the timeout not yet passed for this client?"""
369
now = datetime.datetime.now()
370
if self.last_checked_ok is None:
250
if now is None:
251
now = datetime.datetime.now()
252
if self.last_seen is None:
371
253
return now < (self.created + self.timeout)
372
254
else:
373
return now < (self.last_checked_ok + self.timeout)
255
return now < (self.last_seen + self.timeout)
374
256
375
257
376
258
def peer_certificate(session):
377
"Return the peer's OpenPGP certificate as a bytestring"
378
259
# If not an OpenPGP certificate...
379
260
if gnutls.library.functions.gnutls_certificate_type_get\
380
261
(session._c_object) \
391
272
392
273
393
274
def fingerprint(openpgp):
394
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
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))
395
279
# New GnuTLS "datum" with the OpenPGP public key
396
280
datum = gnutls.library.types.gnutls_datum_t\
397
281
(ctypes.cast(ctypes.c_char_p(openpgp),
398
282
ctypes.POINTER(ctypes.c_ubyte)),
399
283
ctypes.c_uint(len(openpgp)))
400
# New empty GnuTLS certificate
401
crt = gnutls.library.types.gnutls_openpgp_crt_t()
402
gnutls.library.functions.gnutls_openpgp_crt_init\
403
(ctypes.byref(crt))
404
284
# Import the OpenPGP public key into the certificate
405
gnutls.library.functions.gnutls_openpgp_crt_import\
406
(crt, ctypes.byref(datum),
407
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
285
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
(crt,
287
ctypes.byref(datum),
288
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
289
# New buffer for the fingerprint
409
290
buffer = ctypes.create_string_buffer(20)
410
291
buffer_length = ctypes.c_size_t()
426
307
Note: This will run in its own forked process."""
427
308
428
309
def handle(self):
429
logger.info(u"TCP connection from: %s",
310
logger.debug(u"TCP connection from: %s",
430
311
unicode(self.client_address))
431
session = gnutls.connection.ClientSession\
432
(self.request, gnutls.connection.X509Credentials())
433
434
line = self.request.makefile().readline()
435
logger.debug(u"Protocol version: %r", line)
436
try:
437
if int(line.strip().split()[0]) > 1:
438
raise RuntimeError
439
except (ValueError, IndexError, RuntimeError), error:
440
logger.error(u"Unknown protocol version: %s", error)
441
return
442
443
# Note: gnutls.connection.X509Credentials is really a generic
444
# GnuTLS certificate credentials object so long as no X.509
445
# keys are added to it. Therefore, we can use it here despite
446
# using OpenPGP certificates.
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
447
315
448
316
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
449
317
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
450
318
# "+DHE-DSS"))
451
priority = "NORMAL" # Fallback default, since this
452
# MUST be set.
453
if self.server.settings["priority"]:
454
priority = self.server.settings["priority"]
319
priority = "SECURE256"
320
455
321
gnutls.library.functions.gnutls_priority_set_direct\
456
322
(session._c_object, priority, None);
457
323
458
324
try:
459
325
session.handshake()
460
326
except gnutls.errors.GNUTLSError, error:
461
logger.warning(u"Handshake failed: %s", error)
327
logger.debug(u"Handshake failed: %s", error)
462
328
# Do not run session.bye() here: the session is not
463
329
# established. Just abandon the request.
464
330
return
465
331
try:
466
332
fpr = fingerprint(peer_certificate(session))
467
333
except (TypeError, gnutls.errors.GNUTLSError), error:
468
logger.warning(u"Bad certificate: %s", error)
334
logger.debug(u"Bad certificate: %s", error)
469
335
session.bye()
470
336
return
471
337
logger.debug(u"Fingerprint: %s", fpr)
472
338
client = None
473
for c in self.server.clients:
339
for c in clients:
474
340
if c.fingerprint == fpr:
475
341
client = c
476
342
break
477
if not client:
478
logger.warning(u"Client not found for fingerprint: %s",
479
fpr)
480
session.bye()
481
return
482
343
# Have to check if client.still_valid(), since it is possible
483
344
# that the client timed out while establishing the GnuTLS
484
345
# session.
485
if not client.still_valid():
486
logger.warning(u"Client %(name)s is invalid",
487
vars(client))
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
353
session.bye()
489
354
return
490
355
sent_size = 0
500
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
501
366
"""IPv6 TCP server. Accepts 'None' as address and/or port.
502
367
Attributes:
503
settings: Server settings
368
options: Command line options
504
369
clients: Set() of Client objects
505
370
"""
506
371
address_family = socket.AF_INET6
507
372
def __init__(self, *args, **kwargs):
508
if "settings" in kwargs:
509
self.settings = kwargs["settings"]
510
del kwargs["settings"]
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
511
376
if "clients" in kwargs:
512
377
self.clients = kwargs["clients"]
513
378
del kwargs["clients"]
516
381
"""This overrides the normal server_bind() function
517
382
to bind to an interface if one was specified, and also NOT to
518
383
bind to an address or port if they were not specified."""
519
if self.settings["interface"]:
520
# 25 is from /usr/include/asm-i486/socket.h
521
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
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
388
try:
523
389
self.socket.setsockopt(socket.SOL_SOCKET,
524
SO_BINDTODEVICE,
525
self.settings["interface"])
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
526
392
except socket.error, error:
527
393
if error[0] == errno.EPERM:
528
logger.error(u"No permission to"
529
u" bind to interface %s",
530
self.settings["interface"])
394
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
531
397
else:
532
398
raise error
533
399
# Only bind(2) the socket if we really need to.
536
402
in6addr_any = "::"
537
403
self.server_address = (in6addr_any,
538
404
self.server_address[1])
539
elif not self.server_address[1]:
405
elif self.server_address[1] is None:
540
406
self.server_address = (self.server_address[0],
541
407
0)
542
# if self.settings["interface"]:
543
# self.server_address = (self.server_address[0],
544
# 0, # port
545
# 0, # flowinfo
546
# if_nametoindex
547
# (self.settings
548
# ["interface"]))
549
408
return super(type(self), self).server_bind()
550
409
551
410
583
442
return delta
584
443
585
444
445
def add_service():
446
"""From the Avahi server example code"""
447
global group, serviceName, serviceType, servicePort, serviceTXT, \
448
domain, host
449
if group is None:
450
group = dbus.Interface(
451
bus.get_object( avahi.DBUS_NAME,
452
server.EntryGroupNew()),
453
avahi.DBUS_INTERFACE_ENTRY_GROUP)
454
group.connect_to_signal('StateChanged',
455
entry_group_state_changed)
456
logger.debug(u"Adding service '%s' of type '%s' ...",
457
serviceName, serviceType)
458
459
group.AddService(
460
serviceInterface, # interface
461
avahi.PROTO_INET6, # protocol
462
dbus.UInt32(0), # flags
463
serviceName, serviceType,
464
domain, host,
465
dbus.UInt16(servicePort),
466
avahi.string_array_to_txt_array(serviceTXT))
467
group.Commit()
468
469
470
def remove_service():
471
"""From the Avahi server example code"""
472
global group
473
474
if not group is None:
475
group.Reset()
476
477
586
478
def server_state_changed(state):
587
"""Derived from the Avahi example code"""
479
"""From the Avahi server example code"""
588
480
if state == avahi.SERVER_COLLISION:
589
logger.error(u"Server name collision")
590
service.remove()
481
logger.warning(u"Server name collision")
482
remove_service()
591
483
elif state == avahi.SERVER_RUNNING:
592
service.add()
484
add_service()
593
485
594
486
595
487
def entry_group_state_changed(state, error):
596
"""Derived from the Avahi example code"""
488
"""From the Avahi server example code"""
489
global serviceName, server, rename_count
490
597
491
logger.debug(u"state change: %i", state)
598
492
599
493
if state == avahi.ENTRY_GROUP_ESTABLISHED:
600
494
logger.debug(u"Service established.")
601
495
elif state == avahi.ENTRY_GROUP_COLLISION:
602
logger.warning(u"Service name collision.")
603
service.rename()
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()
604
510
elif state == avahi.ENTRY_GROUP_FAILURE:
605
logger.critical(u"Error in group state changed %s",
606
unicode(error))
607
raise AvahiGroupError("State changed: %s", str(error))
511
logger.error(u"Error in group state changed %s",
512
unicode(error))
513
main_loop.quit()
514
return
515
608
516
609
517
def if_nametoindex(interface):
610
"""Call the C function if_nametoindex(), or equivalent"""
611
global if_nametoindex
518
"""Call the C function if_nametoindex()"""
612
519
try:
613
if "ctypes.util" not in sys.modules:
614
import ctypes.util
615
if_nametoindex = ctypes.cdll.LoadLibrary\
616
(ctypes.util.find_library("c")).if_nametoindex
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
return libc.if_nametoindex(interface)
617
522
except (OSError, AttributeError):
618
523
if "struct" not in sys.modules:
619
524
import struct
620
525
if "fcntl" not in sys.modules:
621
526
import fcntl
622
def if_nametoindex(interface):
623
"Get an interface index the hard way, i.e. using fcntl()"
624
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
625
s = socket.socket()
626
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
627
struct.pack("16s16x", interface))
628
s.close()
629
interface_index = struct.unpack("I", ifreq[16:20])[0]
630
return interface_index
631
return if_nametoindex(interface)
632
633
634
def daemon(nochdir = False, noclose = False):
635
"""See daemon(3). Standard BSD Unix function.
636
This should really exist as os.daemon, but it doesn't (yet)."""
637
if os.fork():
638
sys.exit()
639
os.setsid()
640
if not nochdir:
641
os.chdir("/")
642
if os.fork():
643
sys.exit()
644
if not noclose:
645
# Close all standard open file descriptors
646
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
647
if not stat.S_ISCHR(os.fstat(null).st_mode):
648
raise OSError(errno.ENODEV,
649
"/dev/null not a character device")
650
os.dup2(null, sys.stdin.fileno())
651
os.dup2(null, sys.stdout.fileno())
652
os.dup2(null, sys.stderr.fileno())
653
if null > 2:
654
os.close(null)
655
656
657
def main():
658
global main_loop_started
659
main_loop_started = False
660
661
parser = OptionParser(version = "%%prog %s" % version)
527
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
528
s = socket.socket()
529
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
530
struct.pack("16s16x", interface))
531
s.close()
532
interface_index = struct.unpack("I", ifreq[16:20])[0]
533
return interface_index
534
535
536
if __name__ == '__main__':
537
parser = OptionParser()
662
538
parser.add_option("-i", "--interface", type="string",
663
metavar="IF", help="Bind to interface IF")
664
parser.add_option("-a", "--address", type="string",
665
help="Address to listen for requests on")
666
parser.add_option("-p", "--port", type="int",
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,
667
554
help="Port number to receive requests on")
555
parser.add_option("--timeout", type="string", # Parsed later
556
default="1h",
557
help="Amount of downtime allowed for clients")
558
parser.add_option("--interval", type="string", # Parsed later
559
default="5m",
560
help="How often to check that a client is up")
668
561
parser.add_option("--check", action="store_true", default=False,
669
562
help="Run self-test")
670
parser.add_option("--debug", action="store_true",
671
help="Debug mode; run in foreground and log to"
672
" terminal")
673
parser.add_option("--priority", type="string", help="GnuTLS"
674
" priority string (see GnuTLS documentation)")
675
parser.add_option("--servicename", type="string", metavar="NAME",
676
help="Zeroconf service name")
677
parser.add_option("--configdir", type="string",
678
default="/etc/mandos", metavar="DIR",
679
help="Directory to search for configuration"
680
" files")
563
parser.add_option("--debug", action="store_true", default=False,
564
help="Debug mode")
681
565
(options, args) = parser.parse_args()
682
566
683
567
if options.check:
685
569
doctest.testmod()
686
570
sys.exit()
687
571
688
# Default values for config file for server-global settings
689
server_defaults = { "interface": "",
690
"address": "",
691
"port": "",
692
"debug": "False",
693
"priority":
694
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
695
"servicename": "Mandos",
696
}
697
698
# Parse config file for server-global settings
699
server_config = ConfigParser.SafeConfigParser(server_defaults)
700
del server_defaults
701
server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
server_section = "server"
703
# Convert the SafeConfigParser object to a dict
704
server_settings = dict(server_config.items(server_section))
705
# Use getboolean on the boolean config option
706
server_settings["debug"] = server_config.getboolean\
707
(server_section, "debug")
708
del server_config
709
710
# Override the settings from the config file with command line
711
# options, if set.
712
for option in ("interface", "address", "port", "debug",
713
"priority", "servicename", "configdir"):
714
value = getattr(options, option)
715
if value is not None:
716
server_settings[option] = value
717
del options
718
# Now we have our good server settings in "server_settings"
719
720
debug = server_settings["debug"]
721
722
if not debug:
723
syslogger.setLevel(logging.WARNING)
724
console.setLevel(logging.WARNING)
725
726
if server_settings["servicename"] != "Mandos":
727
syslogger.setFormatter(logging.Formatter\
728
('Mandos (%s): %%(levelname)s:'
729
' %%(message)s'
730
% server_settings["servicename"]))
731
732
# Parse config file with clients
733
client_defaults = { "timeout": "1h",
734
"interval": "5m",
735
"checker": "fping -q -- %%(host)s",
736
}
737
client_config = ConfigParser.SafeConfigParser(client_defaults)
738
client_config.read(os.path.join(server_settings["configdir"],
739
"clients.conf"))
740
741
global service
742
service = AvahiService(name = server_settings["servicename"],
743
type = "_mandos._tcp", );
744
if server_settings["interface"]:
745
service.interface = if_nametoindex(server_settings["interface"])
746
747
global main_loop
748
global bus
749
global server
750
# From the Avahi example code
572
# Parse the time arguments
573
try:
574
options.timeout = string_to_delta(options.timeout)
575
except ValueError:
576
parser.error("option --timeout: Unparseable time")
577
try:
578
options.interval = string_to_delta(options.interval)
579
except ValueError:
580
parser.error("option --interval: Unparseable time")
581
582
# Parse config file
583
defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
584
client_config = ConfigParser.SafeConfigParser(defaults)
585
#client_config.readfp(open("secrets.conf"), "secrets.conf")
586
client_config.read("mandos-clients.conf")
587
588
# From the Avahi server example code
751
589
DBusGMainLoop(set_as_default=True )
752
590
main_loop = gobject.MainLoop()
753
591
bus = dbus.SystemBus()
756
594
avahi.DBUS_INTERFACE_SERVER )
757
595
# End of Avahi example code
758
596
597
debug = options.debug
598
759
599
clients = Set()
760
600
def remove_from_clients(client):
761
601
clients.remove(client)
762
602
if not clients:
763
logger.critical(u"No clients left, exiting")
764
sys.exit()
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
765
605
766
clients.update(Set(Client(name = section,
606
clients.update(Set(Client(name=section, options=options,
767
607
stop_hook = remove_from_clients,
768
config
769
= dict(client_config.items(section)))
608
**(dict(client_config\
609
.items(section))))
770
610
for section in client_config.sections()))
771
if not clients:
772
logger.critical(u"No clients defined")
773
sys.exit(1)
774
775
if not debug:
776
logger.removeHandler(console)
777
daemon()
778
779
pidfilename = "/var/run/mandos/mandos.pid"
780
pid = os.getpid()
781
try:
782
pidfile = open(pidfilename, "w")
783
pidfile.write(str(pid) + "\n")
784
pidfile.close()
785
del pidfile
786
except IOError, err:
787
logger.error(u"Could not write %s file with PID %d",
788
pidfilename, os.getpid())
789
790
def cleanup():
791
"Cleanup function; run on exit"
792
global group
793
# From the Avahi example code
794
if not group is None:
795
group.Free()
796
group = None
797
# End of Avahi example code
798
799
while clients:
800
client = clients.pop()
801
client.stop_hook = None
802
client.stop()
803
804
atexit.register(cleanup)
805
806
if not debug:
807
signal.signal(signal.SIGINT, signal.SIG_IGN)
808
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
809
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
810
811
611
for client in clients:
812
612
client.start()
813
613
814
tcp_server = IPv6_TCPServer((server_settings["address"],
815
server_settings["port"]),
614
tcp_server = IPv6_TCPServer((None, options.port),
816
615
tcp_handler,
817
settings=server_settings,
616
options=options,
818
617
clients=clients)
819
# Find out what port we got
820
service.port = tcp_server.socket.getsockname()[1]
821
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
u" scope_id %d" % tcp_server.socket.getsockname())
823
824
#service.interface = tcp_server.socket.getsockname()[3]
825
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)
826
634
try:
827
# From the Avahi example code
828
server.connect_to_signal("StateChanged", server_state_changed)
829
try:
830
server_state_changed(server.GetState())
831
except dbus.exceptions.DBusException, error:
832
logger.critical(u"DBusException: %s", error)
833
sys.exit(1)
834
# End of Avahi example code
835
836
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
lambda *args, **kwargs:
838
tcp_server.handle_request\
839
(*args[2:], **kwargs) or True)
840
841
logger.debug(u"Starting main loop")
842
main_loop_started = True
843
635
main_loop.run()
844
except AvahiError, error:
845
logger.critical(u"AvahiError: %s" + unicode(error))
846
sys.exit(1)
847
636
except KeyboardInterrupt:
848
if debug:
849
print
637
print
638
639
# Cleanup here
850
640
851
if __name__ == '__main__':
852
main()
641
# From the Avahi server example code
642
if not group is None:
643
group.Free()
644
# End of Avahi example code
645
646
for client in clients:
647
client.stop_hook = None
648
client.stop()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0