To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to server.py
- browse files at revision 15.1.1
- compare with another revision
- download diff
- download tarball
- view history from revision 15.1.1
- Committer: Björn Påhlsson
- Date: 2008-07-20 22:58:26 UTC
- mto: This revision was merged to the branch mainline in revision 17.
- Revision ID: belorn@braxen-20080720225826-cj2n2s0xbmxmra60
Added debugg support in form off --debug and --debug=mandosclient
- files added:
- ca.pem
- files removed:
- mandos-client.xml
- 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
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
3
32
4
from __future__ import division
33
5
52
24
import subprocess
53
25
import atexit
54
26
import stat
55
import logging
56
import logging.handlers
57
27
58
28
import dbus
59
29
import gobject
61
31
from dbus.mainloop.glib import DBusGMainLoop
62
32
import ctypes
63
33
34
import logging
35
import logging.handlers
64
36
65
37
logger = logging.Logger('mandos')
66
38
syslogger = logging.handlers.SysLogHandler\
67
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
68
address = "/dev/log")
39
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
69
40
syslogger.setFormatter(logging.Formatter\
70
('Mandos: %(levelname)s: %(message)s'))
41
('%(levelname)s: %(message)s'))
71
42
logger.addHandler(syslogger)
72
73
74
class AvahiError(Exception):
75
def __init__(self, value):
76
self.value = value
77
def __str__(self):
78
return repr(self.value)
79
80
class AvahiServiceError(AvahiError):
81
pass
82
83
class AvahiGroupError(AvahiError):
84
pass
85
86
87
class AvahiService(object):
88
"""An Avahi (Zeroconf) service.
89
Attributes:
90
interface: integer; avahi.IF_UNSPEC or an interface index.
91
Used to optionally bind to the specified interface.
92
name: string; Example: 'Mandos'
93
type: string; Example: '_mandos._tcp'.
94
See <http://www.dns-sd.org/ServiceTypes.html>
95
port: integer; what port to announce
96
TXT: list of strings; TXT record for the service
97
domain: string; Domain to publish on, default to .local if empty.
98
host: string; Host to publish records for, default is localhost
99
max_renames: integer; maximum number of renames
100
rename_count: integer; counter so we only rename after collisions
101
a sensible number of times
102
"""
103
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
104
type = None, port = None, TXT = None, domain = "",
105
host = "", max_renames = 32768):
106
self.interface = interface
107
self.name = name
108
self.type = type
109
self.port = port
110
if TXT is None:
111
self.TXT = []
112
else:
113
self.TXT = TXT
114
self.domain = domain
115
self.host = host
116
self.rename_count = 0
117
def rename(self):
118
"""Derived from the Avahi example code"""
119
if self.rename_count >= self.max_renames:
120
logger.critical(u"No suitable service name found after %i"
121
u" retries, exiting.", rename_count)
122
raise AvahiServiceError("Too many renames")
123
name = server.GetAlternativeServiceName(name)
124
logger.error(u"Changing name to %r ...", name)
125
syslogger.setFormatter(logging.Formatter\
126
('Mandos (%s): %%(levelname)s:'
127
' %%(message)s' % name))
128
self.remove()
129
self.add()
130
self.rename_count += 1
131
def remove(self):
132
"""Derived from the Avahi example code"""
133
if group is not None:
134
group.Reset()
135
def add(self):
136
"""Derived from the Avahi example code"""
137
global group
138
if group is None:
139
group = dbus.Interface\
140
(bus.get_object(avahi.DBUS_NAME,
141
server.EntryGroupNew()),
142
avahi.DBUS_INTERFACE_ENTRY_GROUP)
143
group.connect_to_signal('StateChanged',
144
entry_group_state_changed)
145
logger.debug(u"Adding service '%s' of type '%s' ...",
146
service.name, service.type)
147
group.AddService(
148
self.interface, # interface
149
avahi.PROTO_INET6, # protocol
150
dbus.UInt32(0), # flags
151
self.name, self.type,
152
self.domain, self.host,
153
dbus.UInt16(self.port),
154
avahi.string_array_to_txt_array(self.TXT))
155
group.Commit()
156
157
# From the Avahi example code:
158
group = None # our entry group
43
del syslogger
44
45
# This variable is used to optionally bind to a specified interface.
46
# It is a global variable to fit in with the other variables from the
47
# Avahi server example code.
48
serviceInterface = avahi.IF_UNSPEC
49
# From the Avahi server example code:
50
serviceName = "Mandos"
51
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
52
servicePort = None # Not known at startup
53
serviceTXT = [] # TXT record for the service
54
domain = "" # Domain to publish on, default to .local
55
host = "" # Host to publish records for, default to localhost
56
group = None #our entry group
57
rename_count = 12 # Counter so we only rename after collisions a
58
# sensible number of times
159
59
# End of Avahi example code
160
60
161
61
166
66
fingerprint: string (40 or 32 hexadecimal digits); used to
167
67
uniquely identify the client
168
68
secret: bytestring; sent verbatim (over TLS) to client
169
host: string; available for use by the checker command
170
created: datetime.datetime(); object creation, not client host
171
last_checked_ok: datetime.datetime() or None if not yet checked OK
172
timeout: datetime.timedelta(); How long from last_checked_ok
173
until this client is invalid
69
fqdn: string (FQDN); available for use by the checker command
70
created: datetime.datetime()
71
last_seen: datetime.datetime() or None if not yet seen
72
timeout: datetime.timedelta(); How long from last_seen until
73
this client is invalid
174
74
interval: datetime.timedelta(); How often to start a new checker
175
75
stop_hook: If set, called by stop() as stop_hook(self)
176
76
checker: subprocess.Popen(); a running checker process used
177
77
to see if the client lives.
178
'None' if no process is running.
78
Is None if no process is running.
179
79
checker_initiator_tag: a gobject event source tag, or None
180
80
stop_initiator_tag: - '' -
181
81
checker_callback_tag: - '' -
182
82
checker_command: string; External command which is run to check if
183
client lives. %() expansions are done at
83
client lives. %()s expansions are done at
184
84
runtime with vars(self) as dict, so that for
185
85
instance %(name)s can be used in the command.
186
86
Private attibutes:
187
87
_timeout: Real variable for 'timeout'
188
88
_interval: Real variable for 'interval'
189
_timeout_milliseconds: Used when calling gobject.timeout_add()
89
_timeout_milliseconds: Used by gobject.timeout_add()
190
90
_interval_milliseconds: - '' -
191
91
"""
192
92
def _set_timeout(self, timeout):
212
112
interval = property(lambda self: self._interval,
213
113
_set_interval)
214
114
del _set_interval
215
def __init__(self, name = None, stop_hook=None, config={}):
216
"""Note: the 'checker' key in 'config' sets the
217
'checker_command' attribute and *not* the 'checker'
218
attribute."""
115
def __init__(self, name=None, options=None, stop_hook=None,
116
fingerprint=None, secret=None, secfile=None,
117
fqdn=None, timeout=None, interval=-1, checker=None):
219
118
self.name = name
220
logger.debug(u"Creating client %r", self.name)
221
# Uppercase and remove spaces from fingerprint for later
222
# comparison purposes with return value from the fingerprint()
223
# function
224
self.fingerprint = config["fingerprint"].upper()\
225
.replace(u" ", u"")
226
logger.debug(u" Fingerprint: %s", self.fingerprint)
227
if "secret" in config:
228
self.secret = config["secret"].decode(u"base64")
229
elif "secfile" in config:
230
sf = open(config["secfile"])
119
# Uppercase and remove spaces from fingerprint
120
# for later comparison purposes with return value of
121
# the fingerprint() function
122
self.fingerprint = fingerprint.upper().replace(u" ", u"")
123
if secret:
124
self.secret = secret.decode(u"base64")
125
elif secfile:
126
sf = open(secfile)
231
127
self.secret = sf.read()
232
128
sf.close()
233
129
else:
234
raise TypeError(u"No secret or secfile for client %s"
235
% self.name)
236
self.host = config.get("host", "")
130
raise RuntimeError(u"No secret or secfile for client %s"
131
% self.name)
132
self.fqdn = fqdn # string
237
133
self.created = datetime.datetime.now()
238
self.last_checked_ok = None
239
self.timeout = string_to_delta(config["timeout"])
240
self.interval = string_to_delta(config["interval"])
134
self.last_seen = None
135
if timeout is None:
136
self.timeout = options.timeout
137
else:
138
self.timeout = string_to_delta(timeout)
139
if interval == -1:
140
self.interval = options.interval
141
else:
142
self.interval = string_to_delta(interval)
241
143
self.stop_hook = stop_hook
242
144
self.checker = None
243
145
self.checker_initiator_tag = None
244
146
self.stop_initiator_tag = None
245
147
self.checker_callback_tag = None
246
self.check_command = config["checker"]
148
self.check_command = checker
247
149
def start(self):
248
"""Start this client's checker and timeout hooks"""
150
"""Start this clients checker and timeout hooks"""
249
151
# Schedule a new checker to be started an 'interval' from now,
250
152
# and every interval from then on.
251
153
self.checker_initiator_tag = gobject.timeout_add\
259
161
self.stop)
260
162
def stop(self):
261
163
"""Stop this client.
262
The possibility that a client might be restarted is left open,
263
but not currently used."""
264
# If this client doesn't have a secret, it is already stopped.
265
if hasattr(self, "secret") and self.secret:
266
logger.info(u"Stopping client %s", self.name)
267
self.secret = None
268
else:
269
return False
270
if getattr(self, "stop_initiator_tag", False):
164
The possibility that this client might be restarted is left
165
open, but not currently used."""
166
logger.debug(u"Stopping client %s", self.name)
167
self.secret = None
168
if self.stop_initiator_tag:
271
169
gobject.source_remove(self.stop_initiator_tag)
272
170
self.stop_initiator_tag = None
273
if getattr(self, "checker_initiator_tag", False):
171
if self.checker_initiator_tag:
274
172
gobject.source_remove(self.checker_initiator_tag)
275
173
self.checker_initiator_tag = None
276
174
self.stop_checker()
279
177
# Do not run this again if called by a gobject.timeout_add
280
178
return False
281
179
def __del__(self):
282
self.stop_hook = None
283
self.stop()
180
# Some code duplication here and in stop()
181
if hasattr(self, "stop_initiator_tag") \
182
and self.stop_initiator_tag:
183
gobject.source_remove(self.stop_initiator_tag)
184
self.stop_initiator_tag = None
185
if hasattr(self, "checker_initiator_tag") \
186
and self.checker_initiator_tag:
187
gobject.source_remove(self.checker_initiator_tag)
188
self.checker_initiator_tag = None
189
self.stop_checker()
284
190
def checker_callback(self, pid, condition):
285
191
"""The checker has completed, so take appropriate actions."""
286
192
now = datetime.datetime.now()
287
self.checker_callback_tag = None
288
self.checker = None
289
193
if os.WIFEXITED(condition) \
290
194
and (os.WEXITSTATUS(condition) == 0):
291
logger.info(u"Checker for %(name)s succeeded",
292
vars(self))
293
self.last_checked_ok = now
195
logger.debug(u"Checker for %(name)s succeeded",
196
vars(self))
197
self.last_seen = now
294
198
gobject.source_remove(self.stop_initiator_tag)
295
199
self.stop_initiator_tag = gobject.timeout_add\
296
200
(self._timeout_milliseconds,
299
203
logger.warning(u"Checker for %(name)s crashed?",
300
204
vars(self))
301
205
else:
302
logger.info(u"Checker for %(name)s failed",
303
vars(self))
206
logger.debug(u"Checker for %(name)s failed",
207
vars(self))
208
self.checker = None
209
self.checker_callback_tag = None
304
210
def start_checker(self):
305
211
"""Start a new checker subprocess if one is not running.
306
212
If a checker already exists, leave it running and do
307
213
nothing."""
308
# The reason for not killing a running checker is that if we
309
# did that, then if a checker (for some reason) started
310
# running slowly and taking more than 'interval' time, the
311
# client would inevitably timeout, since no checker would get
312
# a chance to run to completion. If we instead leave running
313
# checkers alone, the checker would have to take more time
314
# than 'timeout' for the client to be declared invalid, which
315
# is as it should be.
316
214
if self.checker is None:
317
215
try:
318
# In case check_command has exactly one % operator
319
command = self.check_command % self.host
216
command = self.check_command % self.fqdn
320
217
except TypeError:
321
# Escape attributes for the shell
322
218
escaped_attrs = dict((key, re.escape(str(val)))
323
219
for key, val in
324
220
vars(self).iteritems())
325
221
try:
326
222
command = self.check_command % escaped_attrs
327
223
except TypeError, error:
328
logger.error(u'Could not format string "%s":'
329
u' %s', self.check_command, error)
224
logger.critical(u'Could not format string "%s":'
225
u' %s', self.check_command, error)
330
226
return True # Try again later
331
227
try:
332
logger.info(u"Starting checker %r for %s",
333
command, self.name)
334
self.checker = subprocess.Popen(command,
335
close_fds=True,
336
shell=True, cwd="/")
228
logger.debug(u"Starting checker %r for %s",
229
command, self.name)
230
self.checker = subprocess.\
231
Popen(command,
232
close_fds=True, shell=True,
233
cwd="/")
337
234
self.checker_callback_tag = gobject.child_watch_add\
338
235
(self.checker.pid,
339
236
self.checker_callback)
344
241
return True
345
242
def stop_checker(self):
346
243
"""Force the checker process, if any, to stop."""
347
if self.checker_callback_tag:
348
gobject.source_remove(self.checker_callback_tag)
349
self.checker_callback_tag = None
350
if getattr(self, "checker", None) is None:
244
if not hasattr(self, "checker") or self.checker is None:
351
245
return
352
logger.debug(u"Stopping checker for %(name)s", vars(self))
353
try:
354
os.kill(self.checker.pid, signal.SIGTERM)
355
#os.sleep(0.5)
356
#if self.checker.poll() is None:
357
# os.kill(self.checker.pid, signal.SIGKILL)
358
except OSError, error:
359
if error.errno != errno.ESRCH: # No such process
360
raise
246
gobject.source_remove(self.checker_callback_tag)
247
self.checker_callback_tag = None
248
os.kill(self.checker.pid, signal.SIGTERM)
249
if self.checker.poll() is None:
250
os.kill(self.checker.pid, signal.SIGKILL)
361
251
self.checker = None
362
def still_valid(self):
252
def still_valid(self, now=None):
363
253
"""Has the timeout not yet passed for this client?"""
364
now = datetime.datetime.now()
365
if self.last_checked_ok is None:
254
if now is None:
255
now = datetime.datetime.now()
256
if self.last_seen is None:
366
257
return now < (self.created + self.timeout)
367
258
else:
368
return now < (self.last_checked_ok + self.timeout)
259
return now < (self.last_seen + self.timeout)
369
260
370
261
371
262
def peer_certificate(session):
372
"Return the peer's OpenPGP certificate as a bytestring"
263
"Return an OpenPGP data packet string for the peer's certificate"
373
264
# If not an OpenPGP certificate...
374
265
if gnutls.library.functions.gnutls_certificate_type_get\
375
266
(session._c_object) \
386
277
387
278
388
279
def fingerprint(openpgp):
389
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
280
"Convert an OpenPGP data string to a hexdigit fingerprint string"
281
# New empty GnuTLS certificate
282
crt = gnutls.library.types.gnutls_openpgp_crt_t()
283
gnutls.library.functions.gnutls_openpgp_crt_init\
284
(ctypes.byref(crt))
390
285
# New GnuTLS "datum" with the OpenPGP public key
391
286
datum = gnutls.library.types.gnutls_datum_t\
392
287
(ctypes.cast(ctypes.c_char_p(openpgp),
393
288
ctypes.POINTER(ctypes.c_ubyte)),
394
289
ctypes.c_uint(len(openpgp)))
395
# New empty GnuTLS certificate
396
crt = gnutls.library.types.gnutls_openpgp_crt_t()
397
gnutls.library.functions.gnutls_openpgp_crt_init\
398
(ctypes.byref(crt))
399
290
# Import the OpenPGP public key into the certificate
400
gnutls.library.functions.gnutls_openpgp_crt_import\
401
(crt, ctypes.byref(datum),
402
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
291
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
292
(crt,
293
ctypes.byref(datum),
294
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
403
295
# New buffer for the fingerprint
404
296
buffer = ctypes.create_string_buffer(20)
405
297
buffer_length = ctypes.c_size_t()
421
313
Note: This will run in its own forked process."""
422
314
423
315
def handle(self):
424
logger.info(u"TCP connection from: %s",
316
logger.debug(u"TCP connection from: %s",
425
317
unicode(self.client_address))
426
session = gnutls.connection.ClientSession\
427
(self.request, gnutls.connection.X509Credentials())
428
429
line = self.request.makefile().readline()
430
logger.debug(u"Protocol version: %r", line)
431
try:
432
if int(line.strip().split()[0]) > 1:
433
raise RuntimeError
434
except (ValueError, IndexError, RuntimeError), error:
435
logger.error(u"Unknown protocol version: %s", error)
436
return
437
438
# Note: gnutls.connection.X509Credentials is really a generic
439
# GnuTLS certificate credentials object so long as no X.509
440
# keys are added to it. Therefore, we can use it here despite
441
# using OpenPGP certificates.
318
session = gnutls.connection.ClientSession(self.request,
319
gnutls.connection.\
320
X509Credentials())
442
321
443
322
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
444
323
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
445
324
# "+DHE-DSS"))
446
priority = "NORMAL" # Fallback default, since this
447
# MUST be set.
448
if self.server.settings["priority"]:
449
priority = self.server.settings["priority"]
325
priority = "SECURE256"
326
450
327
gnutls.library.functions.gnutls_priority_set_direct\
451
328
(session._c_object, priority, None);
452
329
453
330
try:
454
331
session.handshake()
455
332
except gnutls.errors.GNUTLSError, error:
456
logger.warning(u"Handshake failed: %s", error)
333
logger.debug(u"Handshake failed: %s", error)
457
334
# Do not run session.bye() here: the session is not
458
335
# established. Just abandon the request.
459
336
return
460
337
try:
461
338
fpr = fingerprint(peer_certificate(session))
462
339
except (TypeError, gnutls.errors.GNUTLSError), error:
463
logger.warning(u"Bad certificate: %s", error)
340
logger.debug(u"Bad certificate: %s", error)
464
341
session.bye()
465
342
return
466
343
logger.debug(u"Fingerprint: %s", fpr)
467
344
client = None
468
for c in self.server.clients:
345
for c in clients:
469
346
if c.fingerprint == fpr:
470
347
client = c
471
348
break
472
if not client:
473
logger.warning(u"Client not found for fingerprint: %s",
474
fpr)
475
session.bye()
476
return
477
349
# Have to check if client.still_valid(), since it is possible
478
350
# that the client timed out while establishing the GnuTLS
479
351
# session.
480
if not client.still_valid():
481
logger.warning(u"Client %(name)s is invalid",
482
vars(client))
352
if (not client) or (not client.still_valid()):
353
if client:
354
logger.debug(u"Client %(name)s is invalid",
355
vars(client))
356
else:
357
logger.debug(u"Client not found for fingerprint: %s",
358
fpr)
483
359
session.bye()
484
360
return
485
361
sent_size = 0
495
371
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
496
372
"""IPv6 TCP server. Accepts 'None' as address and/or port.
497
373
Attributes:
498
settings: Server settings
374
options: Command line options
499
375
clients: Set() of Client objects
500
376
"""
501
377
address_family = socket.AF_INET6
502
378
def __init__(self, *args, **kwargs):
503
if "settings" in kwargs:
504
self.settings = kwargs["settings"]
505
del kwargs["settings"]
379
if "options" in kwargs:
380
self.options = kwargs["options"]
381
del kwargs["options"]
506
382
if "clients" in kwargs:
507
383
self.clients = kwargs["clients"]
508
384
del kwargs["clients"]
511
387
"""This overrides the normal server_bind() function
512
388
to bind to an interface if one was specified, and also NOT to
513
389
bind to an address or port if they were not specified."""
514
if self.settings["interface"]:
515
# 25 is from /usr/include/asm-i486/socket.h
516
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
390
if self.options.interface:
391
if not hasattr(socket, "SO_BINDTODEVICE"):
392
# From /usr/include/asm-i486/socket.h
393
socket.SO_BINDTODEVICE = 25
517
394
try:
518
395
self.socket.setsockopt(socket.SOL_SOCKET,
519
SO_BINDTODEVICE,
520
self.settings["interface"])
396
socket.SO_BINDTODEVICE,
397
self.options.interface)
521
398
except socket.error, error:
522
399
if error[0] == errno.EPERM:
523
logger.error(u"No permission to"
524
u" bind to interface %s",
525
self.settings["interface"])
400
logger.warning(u"No permission to"
401
u" bind to interface %s",
402
self.options.interface)
526
403
else:
527
404
raise error
528
405
# Only bind(2) the socket if we really need to.
531
408
in6addr_any = "::"
532
409
self.server_address = (in6addr_any,
533
410
self.server_address[1])
534
elif not self.server_address[1]:
411
elif self.server_address[1] is None:
535
412
self.server_address = (self.server_address[0],
536
413
0)
537
# if self.settings["interface"]:
538
# self.server_address = (self.server_address[0],
539
# 0, # port
540
# 0, # flowinfo
541
# if_nametoindex
542
# (self.settings
543
# ["interface"]))
544
414
return super(type(self), self).server_bind()
545
415
546
416
578
448
return delta
579
449
580
450
451
def add_service():
452
"""From the Avahi server example code"""
453
global group, serviceName, serviceType, servicePort, serviceTXT, \
454
domain, host
455
if group is None:
456
group = dbus.Interface(
457
bus.get_object( avahi.DBUS_NAME,
458
server.EntryGroupNew()),
459
avahi.DBUS_INTERFACE_ENTRY_GROUP)
460
group.connect_to_signal('StateChanged',
461
entry_group_state_changed)
462
logger.debug(u"Adding service '%s' of type '%s' ...",
463
serviceName, serviceType)
464
465
group.AddService(
466
serviceInterface, # interface
467
avahi.PROTO_INET6, # protocol
468
dbus.UInt32(0), # flags
469
serviceName, serviceType,
470
domain, host,
471
dbus.UInt16(servicePort),
472
avahi.string_array_to_txt_array(serviceTXT))
473
group.Commit()
474
475
476
def remove_service():
477
"""From the Avahi server example code"""
478
global group
479
480
if not group is None:
481
group.Reset()
482
483
581
484
def server_state_changed(state):
582
"""Derived from the Avahi example code"""
485
"""From the Avahi server example code"""
583
486
if state == avahi.SERVER_COLLISION:
584
logger.error(u"Server name collision")
585
service.remove()
487
logger.warning(u"Server name collision")
488
remove_service()
586
489
elif state == avahi.SERVER_RUNNING:
587
service.add()
490
add_service()
588
491
589
492
590
493
def entry_group_state_changed(state, error):
591
"""Derived from the Avahi example code"""
494
"""From the Avahi server example code"""
495
global serviceName, server, rename_count
496
592
497
logger.debug(u"state change: %i", state)
593
498
594
499
if state == avahi.ENTRY_GROUP_ESTABLISHED:
595
500
logger.debug(u"Service established.")
596
501
elif state == avahi.ENTRY_GROUP_COLLISION:
597
logger.warning(u"Service name collision.")
598
service.rename()
502
503
rename_count = rename_count - 1
504
if rename_count > 0:
505
name = server.GetAlternativeServiceName(name)
506
logger.warning(u"Service name collision, "
507
u"changing name to '%s' ...", name)
508
remove_service()
509
add_service()
510
511
else:
512
logger.error(u"No suitable service name found after %i"
513
u" retries, exiting.", n_rename)
514
killme(1)
599
515
elif state == avahi.ENTRY_GROUP_FAILURE:
600
logger.critical(u"Error in group state changed %s",
601
unicode(error))
602
raise AvahiGroupError("State changed: %s", str(error))
516
logger.error(u"Error in group state changed %s",
517
unicode(error))
518
killme(1)
519
603
520
604
521
def if_nametoindex(interface):
605
"""Call the C function if_nametoindex(), or equivalent"""
606
global if_nametoindex
522
"""Call the C function if_nametoindex()"""
607
523
try:
608
if "ctypes.util" not in sys.modules:
609
import ctypes.util
610
if_nametoindex = ctypes.cdll.LoadLibrary\
611
(ctypes.util.find_library("c")).if_nametoindex
524
libc = ctypes.cdll.LoadLibrary("libc.so.6")
525
return libc.if_nametoindex(interface)
612
526
except (OSError, AttributeError):
613
527
if "struct" not in sys.modules:
614
528
import struct
615
529
if "fcntl" not in sys.modules:
616
530
import fcntl
617
def if_nametoindex(interface):
618
"Get an interface index the hard way, i.e. using fcntl()"
619
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
620
s = socket.socket()
621
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
622
struct.pack("16s16x", interface))
623
s.close()
624
interface_index = struct.unpack("I", ifreq[16:20])[0]
625
return interface_index
626
return if_nametoindex(interface)
627
628
629
def daemon(nochdir = False, noclose = False):
531
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
532
s = socket.socket()
533
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
534
struct.pack("16s16x", interface))
535
s.close()
536
interface_index = struct.unpack("I", ifreq[16:20])[0]
537
return interface_index
538
539
540
def daemon(nochdir, noclose):
630
541
"""See daemon(3). Standard BSD Unix function.
631
542
This should really exist as os.daemon, but it doesn't (yet)."""
632
543
if os.fork():
634
545
os.setsid()
635
546
if not nochdir:
636
547
os.chdir("/")
637
if os.fork():
638
sys.exit()
639
548
if not noclose:
640
549
# Close all standard open file descriptors
641
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
550
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
642
551
if not stat.S_ISCHR(os.fstat(null).st_mode):
643
552
raise OSError(errno.ENODEV,
644
553
"/dev/null not a character device")
649
558
os.close(null)
650
559
651
560
652
def main():
653
global main_loop_started
561
def killme(status = 0):
562
logger.debug("Stopping server with exit status %d", status)
563
exitstatus = status
564
if main_loop_started:
565
main_loop.quit()
566
else:
567
sys.exit(status)
568
569
570
if __name__ == '__main__':
571
exitstatus = 0
654
572
main_loop_started = False
655
656
573
parser = OptionParser()
657
574
parser.add_option("-i", "--interface", type="string",
658
metavar="IF", help="Bind to interface IF")
659
parser.add_option("-a", "--address", type="string",
660
help="Address to listen for requests on")
661
parser.add_option("-p", "--port", type="int",
575
default=None, metavar="IF",
576
help="Bind to interface IF")
577
parser.add_option("-p", "--port", type="int", default=None,
662
578
help="Port number to receive requests on")
579
parser.add_option("--timeout", type="string", # Parsed later
580
default="1h",
581
help="Amount of downtime allowed for clients")
582
parser.add_option("--interval", type="string", # Parsed later
583
default="5m",
584
help="How often to check that a client is up")
663
585
parser.add_option("--check", action="store_true", default=False,
664
586
help="Run self-test")
665
parser.add_option("--debug", action="store_true",
666
help="Debug mode; run in foreground and log to"
667
" terminal")
668
parser.add_option("--priority", type="string", help="GnuTLS"
669
" priority string (see GnuTLS documentation)")
670
parser.add_option("--servicename", type="string", metavar="NAME",
671
help="Zeroconf service name")
672
parser.add_option("--configdir", type="string",
673
default="/etc/mandos", metavar="DIR",
674
help="Directory to search for configuration"
675
" files")
587
parser.add_option("--debug", action="store_true", default=False,
588
help="Debug mode")
676
589
(options, args) = parser.parse_args()
677
590
678
591
if options.check:
680
593
doctest.testmod()
681
594
sys.exit()
682
595
683
# Default values for config file for server-global settings
684
server_defaults = { "interface": "",
685
"address": "",
686
"port": "",
687
"debug": "False",
688
"priority":
689
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
690
"servicename": "Mandos",
691
}
692
693
# Parse config file for server-global settings
694
server_config = ConfigParser.SafeConfigParser(server_defaults)
695
del server_defaults
696
server_config.read(os.path.join(options.configdir, "mandos.conf"))
697
server_section = "server"
698
# Convert the SafeConfigParser object to a dict
699
server_settings = dict(server_config.items(server_section))
700
# Use getboolean on the boolean config option
701
server_settings["debug"] = server_config.getboolean\
702
(server_section, "debug")
703
del server_config
704
705
# Override the settings from the config file with command line
706
# options, if set.
707
for option in ("interface", "address", "port", "debug",
708
"priority", "servicename", "configdir"):
709
value = getattr(options, option)
710
if value is not None:
711
server_settings[option] = value
712
del options
713
# Now we have our good server settings in "server_settings"
714
715
debug = server_settings["debug"]
716
717
if not debug:
718
syslogger.setLevel(logging.WARNING)
719
720
if server_settings["servicename"] != "Mandos":
721
syslogger.setFormatter(logging.Formatter\
722
('Mandos (%s): %%(levelname)s:'
723
' %%(message)s'
724
% server_settings["servicename"]))
725
726
# Parse config file with clients
727
client_defaults = { "timeout": "1h",
728
"interval": "5m",
729
"checker": "fping -q -- %%(host)s",
730
}
731
client_config = ConfigParser.SafeConfigParser(client_defaults)
732
client_config.read(os.path.join(server_settings["configdir"],
733
"clients.conf"))
734
735
global service
736
service = AvahiService(name = server_settings["servicename"],
737
type = "_mandos._tcp", );
738
if server_settings["interface"]:
739
service.interface = if_nametoindex(server_settings["interface"])
740
741
global main_loop
742
global bus
743
global server
744
# From the Avahi example code
596
# Parse the time arguments
597
try:
598
options.timeout = string_to_delta(options.timeout)
599
except ValueError:
600
parser.error("option --timeout: Unparseable time")
601
try:
602
options.interval = string_to_delta(options.interval)
603
except ValueError:
604
parser.error("option --interval: Unparseable time")
605
606
# Parse config file
607
defaults = { "checker": "fping -q -- %%(fqdn)s" }
608
client_config = ConfigParser.SafeConfigParser(defaults)
609
#client_config.readfp(open("secrets.conf"), "secrets.conf")
610
client_config.read("mandos-clients.conf")
611
612
# From the Avahi server example code
745
613
DBusGMainLoop(set_as_default=True )
746
614
main_loop = gobject.MainLoop()
747
615
bus = dbus.SystemBus()
750
618
avahi.DBUS_INTERFACE_SERVER )
751
619
# End of Avahi example code
752
620
621
debug = options.debug
622
753
623
if debug:
754
624
console = logging.StreamHandler()
755
625
# console.setLevel(logging.DEBUG)
762
632
def remove_from_clients(client):
763
633
clients.remove(client)
764
634
if not clients:
765
logger.critical(u"No clients left, exiting")
766
sys.exit()
635
logger.debug(u"No clients left, exiting")
636
killme()
767
637
768
clients.update(Set(Client(name = section,
638
clients.update(Set(Client(name=section, options=options,
769
639
stop_hook = remove_from_clients,
770
config
771
= dict(client_config.items(section)))
640
**(dict(client_config\
641
.items(section))))
772
642
for section in client_config.sections()))
773
if not clients:
774
logger.critical(u"No clients defined")
775
sys.exit(1)
776
643
777
644
if not debug:
778
daemon()
779
780
pidfilename = "/var/run/mandos/mandos.pid"
781
pid = os.getpid()
782
try:
783
pidfile = open(pidfilename, "w")
784
pidfile.write(str(pid) + "\n")
785
pidfile.close()
786
del pidfile
787
except IOError, err:
788
logger.error(u"Could not write %s file with PID %d",
789
pidfilename, os.getpid())
645
daemon(False, False)
790
646
791
647
def cleanup():
792
648
"Cleanup function; run on exit"
793
649
global group
794
# From the Avahi example code
650
# From the Avahi server example code
795
651
if not group is None:
796
652
group.Free()
797
653
group = None
798
654
# End of Avahi example code
799
655
800
while clients:
801
client = clients.pop()
656
for client in clients:
802
657
client.stop_hook = None
803
658
client.stop()
804
659
806
661
807
662
if not debug:
808
663
signal.signal(signal.SIGINT, signal.SIG_IGN)
809
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
810
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
664
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
665
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
811
666
812
667
for client in clients:
813
668
client.start()
814
669
815
tcp_server = IPv6_TCPServer((server_settings["address"],
816
server_settings["port"]),
670
tcp_server = IPv6_TCPServer((None, options.port),
817
671
tcp_handler,
818
settings=server_settings,
672
options=options,
819
673
clients=clients)
820
# Find out what port we got
821
service.port = tcp_server.socket.getsockname()[1]
822
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
823
u" scope_id %d" % tcp_server.socket.getsockname())
824
825
#service.interface = tcp_server.socket.getsockname()[3]
826
827
try:
828
# From the Avahi example code
829
server.connect_to_signal("StateChanged", server_state_changed)
830
try:
831
server_state_changed(server.GetState())
832
except dbus.exceptions.DBusException, error:
833
logger.critical(u"DBusException: %s", error)
834
sys.exit(1)
835
# End of Avahi example code
836
837
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
838
lambda *args, **kwargs:
839
tcp_server.handle_request\
840
(*args[2:], **kwargs) or True)
841
842
logger.debug(u"Starting main loop")
674
# Find out what random port we got
675
servicePort = tcp_server.socket.getsockname()[1]
676
logger.debug(u"Now listening on port %d", servicePort)
677
678
if options.interface is not None:
679
serviceInterface = if_nametoindex(options.interface)
680
681
# From the Avahi server example code
682
server.connect_to_signal("StateChanged", server_state_changed)
683
try:
684
server_state_changed(server.GetState())
685
except dbus.exceptions.DBusException, error:
686
logger.critical(u"DBusException: %s", error)
687
killme(1)
688
# End of Avahi example code
689
690
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
691
lambda *args, **kwargs:
692
tcp_server.handle_request(*args[2:],
693
**kwargs) or True)
694
try:
843
695
main_loop_started = True
844
696
main_loop.run()
845
except AvahiError, error:
846
logger.critical(u"AvahiError: %s" + unicode(error))
847
sys.exit(1)
848
697
except KeyboardInterrupt:
849
698
if debug:
850
699
print
851
852
if __name__ == '__main__':
853
main()
700
701
sys.exit(exitstatus)
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0