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- 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:
- 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
2
# -*- 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
# 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
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#
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# This program is free software: you can redistribute it and/or modify
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# 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
64
version = "1.0"
34
import logging
35
import logging.handlers
65
36
66
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logger = logging.Logger('mandos')
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38
syslogger = logging.handlers.SysLogHandler\
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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
address = "/dev/log")
39
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
70
40
syslogger.setFormatter(logging.Formatter\
71
('Mandos: %(levelname)s: %(message)s'))
41
('%(levelname)s: %(message)s'))
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42
logger.addHandler(syslogger)
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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.
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host: string; Host to publish records for, default is localhost
104
max_renames: integer; maximum number of renames
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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
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
164
59
# End of Avahi example code
165
60
166
61
171
66
fingerprint: string (40 or 32 hexadecimal digits); used to
172
67
uniquely identify the client
173
68
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
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
179
74
interval: datetime.timedelta(); How often to start a new checker
180
75
stop_hook: If set, called by stop() as stop_hook(self)
181
76
checker: subprocess.Popen(); a running checker process used
182
77
to see if the client lives.
183
'None' if no process is running.
78
Is None if no process is running.
184
79
checker_initiator_tag: a gobject event source tag, or None
185
80
stop_initiator_tag: - '' -
186
81
checker_callback_tag: - '' -
187
82
checker_command: string; External command which is run to check if
188
client lives. %() expansions are done at
83
client lives. %()s expansions are done at
189
84
runtime with vars(self) as dict, so that for
190
85
instance %(name)s can be used in the command.
191
86
Private attibutes:
192
87
_timeout: Real variable for 'timeout'
193
88
_interval: Real variable for 'interval'
194
_timeout_milliseconds: Used when calling gobject.timeout_add()
89
_timeout_milliseconds: Used by gobject.timeout_add()
195
90
_interval_milliseconds: - '' -
196
91
"""
197
92
def _set_timeout(self, timeout):
217
112
interval = property(lambda self: self._interval,
218
113
_set_interval)
219
114
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."""
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):
224
118
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"])
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)
236
127
self.secret = sf.read()
237
128
sf.close()
238
129
else:
239
raise TypeError(u"No secret or secfile for client %s"
240
% self.name)
241
self.host = config.get("host", "")
130
raise RuntimeError(u"No secret or secfile for client %s"
131
% self.name)
132
self.fqdn = fqdn # string
242
133
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"])
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)
246
143
self.stop_hook = stop_hook
247
144
self.checker = None
248
145
self.checker_initiator_tag = None
249
146
self.stop_initiator_tag = None
250
147
self.checker_callback_tag = None
251
self.check_command = config["checker"]
148
self.check_command = checker
252
149
def start(self):
253
"""Start this client's checker and timeout hooks"""
150
"""Start this clients checker and timeout hooks"""
254
151
# Schedule a new checker to be started an 'interval' from now,
255
152
# and every interval from then on.
256
153
self.checker_initiator_tag = gobject.timeout_add\
264
161
self.stop)
265
162
def stop(self):
266
163
"""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):
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:
276
169
gobject.source_remove(self.stop_initiator_tag)
277
170
self.stop_initiator_tag = None
278
if getattr(self, "checker_initiator_tag", False):
171
if self.checker_initiator_tag:
279
172
gobject.source_remove(self.checker_initiator_tag)
280
173
self.checker_initiator_tag = None
281
174
self.stop_checker()
284
177
# Do not run this again if called by a gobject.timeout_add
285
178
return False
286
179
def __del__(self):
287
self.stop_hook = None
288
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()
289
190
def checker_callback(self, pid, condition):
290
191
"""The checker has completed, so take appropriate actions."""
291
192
now = datetime.datetime.now()
292
self.checker_callback_tag = None
293
self.checker = None
294
193
if os.WIFEXITED(condition) \
295
194
and (os.WEXITSTATUS(condition) == 0):
296
logger.info(u"Checker for %(name)s succeeded",
297
vars(self))
298
self.last_checked_ok = now
195
logger.debug(u"Checker for %(name)s succeeded",
196
vars(self))
197
self.last_seen = now
299
198
gobject.source_remove(self.stop_initiator_tag)
300
199
self.stop_initiator_tag = gobject.timeout_add\
301
200
(self._timeout_milliseconds,
304
203
logger.warning(u"Checker for %(name)s crashed?",
305
204
vars(self))
306
205
else:
307
logger.info(u"Checker for %(name)s failed",
308
vars(self))
206
logger.debug(u"Checker for %(name)s failed",
207
vars(self))
208
self.checker = None
209
self.checker_callback_tag = None
309
210
def start_checker(self):
310
211
"""Start a new checker subprocess if one is not running.
311
212
If a checker already exists, leave it running and do
312
213
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
214
if self.checker is None:
322
215
try:
323
# In case check_command has exactly one % operator
324
command = self.check_command % self.host
216
command = self.check_command % self.fqdn
325
217
except TypeError:
326
# Escape attributes for the shell
327
218
escaped_attrs = dict((key, re.escape(str(val)))
328
219
for key, val in
329
220
vars(self).iteritems())
330
221
try:
331
222
command = self.check_command % escaped_attrs
332
223
except TypeError, error:
333
logger.error(u'Could not format string "%s":'
334
u' %s', self.check_command, error)
224
logger.critical(u'Could not format string "%s":'
225
u' %s', self.check_command, error)
335
226
return True # Try again later
336
227
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="/")
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="/")
342
234
self.checker_callback_tag = gobject.child_watch_add\
343
235
(self.checker.pid,
344
236
self.checker_callback)
349
241
return True
350
242
def stop_checker(self):
351
243
"""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:
244
if not hasattr(self, "checker") or self.checker is None:
356
245
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
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)
366
251
self.checker = None
367
def still_valid(self):
252
def still_valid(self, now=None):
368
253
"""Has the timeout not yet passed for this client?"""
369
now = datetime.datetime.now()
370
if self.last_checked_ok is None:
254
if now is None:
255
now = datetime.datetime.now()
256
if self.last_seen is None:
371
257
return now < (self.created + self.timeout)
372
258
else:
373
return now < (self.last_checked_ok + self.timeout)
259
return now < (self.last_seen + self.timeout)
374
260
375
261
376
262
def peer_certificate(session):
377
"Return the peer's OpenPGP certificate as a bytestring"
263
"Return an OpenPGP data packet string for the peer's certificate"
378
264
# If not an OpenPGP certificate...
379
265
if gnutls.library.functions.gnutls_certificate_type_get\
380
266
(session._c_object) \
391
277
392
278
393
279
def fingerprint(openpgp):
394
"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))
395
285
# New GnuTLS "datum" with the OpenPGP public key
396
286
datum = gnutls.library.types.gnutls_datum_t\
397
287
(ctypes.cast(ctypes.c_char_p(openpgp),
398
288
ctypes.POINTER(ctypes.c_ubyte)),
399
289
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
290
# 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)
291
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
292
(crt,
293
ctypes.byref(datum),
294
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
295
# New buffer for the fingerprint
409
296
buffer = ctypes.create_string_buffer(20)
410
297
buffer_length = ctypes.c_size_t()
426
313
Note: This will run in its own forked process."""
427
314
428
315
def handle(self):
429
logger.info(u"TCP connection from: %s",
316
logger.debug(u"TCP connection from: %s",
430
317
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.
318
session = gnutls.connection.ClientSession(self.request,
319
gnutls.connection.\
320
X509Credentials())
447
321
448
322
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
449
323
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
450
324
# "+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"]
325
priority = "SECURE256"
326
455
327
gnutls.library.functions.gnutls_priority_set_direct\
456
328
(session._c_object, priority, None);
457
329
458
330
try:
459
331
session.handshake()
460
332
except gnutls.errors.GNUTLSError, error:
461
logger.warning(u"Handshake failed: %s", error)
333
logger.debug(u"Handshake failed: %s", error)
462
334
# Do not run session.bye() here: the session is not
463
335
# established. Just abandon the request.
464
336
return
465
337
try:
466
338
fpr = fingerprint(peer_certificate(session))
467
339
except (TypeError, gnutls.errors.GNUTLSError), error:
468
logger.warning(u"Bad certificate: %s", error)
340
logger.debug(u"Bad certificate: %s", error)
469
341
session.bye()
470
342
return
471
343
logger.debug(u"Fingerprint: %s", fpr)
472
344
client = None
473
for c in self.server.clients:
345
for c in clients:
474
346
if c.fingerprint == fpr:
475
347
client = c
476
348
break
477
if not client:
478
logger.warning(u"Client not found for fingerprint: %s",
479
fpr)
480
session.bye()
481
return
482
349
# Have to check if client.still_valid(), since it is possible
483
350
# that the client timed out while establishing the GnuTLS
484
351
# session.
485
if not client.still_valid():
486
logger.warning(u"Client %(name)s is invalid",
487
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)
488
359
session.bye()
489
360
return
490
361
sent_size = 0
500
371
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
501
372
"""IPv6 TCP server. Accepts 'None' as address and/or port.
502
373
Attributes:
503
settings: Server settings
374
options: Command line options
504
375
clients: Set() of Client objects
505
376
"""
506
377
address_family = socket.AF_INET6
507
378
def __init__(self, *args, **kwargs):
508
if "settings" in kwargs:
509
self.settings = kwargs["settings"]
510
del kwargs["settings"]
379
if "options" in kwargs:
380
self.options = kwargs["options"]
381
del kwargs["options"]
511
382
if "clients" in kwargs:
512
383
self.clients = kwargs["clients"]
513
384
del kwargs["clients"]
516
387
"""This overrides the normal server_bind() function
517
388
to bind to an interface if one was specified, and also NOT to
518
389
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)
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
522
394
try:
523
395
self.socket.setsockopt(socket.SOL_SOCKET,
524
SO_BINDTODEVICE,
525
self.settings["interface"])
396
socket.SO_BINDTODEVICE,
397
self.options.interface)
526
398
except socket.error, error:
527
399
if error[0] == errno.EPERM:
528
logger.error(u"No permission to"
529
u" bind to interface %s",
530
self.settings["interface"])
400
logger.warning(u"No permission to"
401
u" bind to interface %s",
402
self.options.interface)
531
403
else:
532
404
raise error
533
405
# Only bind(2) the socket if we really need to.
536
408
in6addr_any = "::"
537
409
self.server_address = (in6addr_any,
538
410
self.server_address[1])
539
elif not self.server_address[1]:
411
elif self.server_address[1] is None:
540
412
self.server_address = (self.server_address[0],
541
413
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
414
return super(type(self), self).server_bind()
550
415
551
416
583
448
return delta
584
449
585
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
586
484
def server_state_changed(state):
587
"""Derived from the Avahi example code"""
485
"""From the Avahi server example code"""
588
486
if state == avahi.SERVER_COLLISION:
589
logger.error(u"Server name collision")
590
service.remove()
487
logger.warning(u"Server name collision")
488
remove_service()
591
489
elif state == avahi.SERVER_RUNNING:
592
service.add()
490
add_service()
593
491
594
492
595
493
def entry_group_state_changed(state, error):
596
"""Derived from the Avahi example code"""
494
"""From the Avahi server example code"""
495
global serviceName, server, rename_count
496
597
497
logger.debug(u"state change: %i", state)
598
498
599
499
if state == avahi.ENTRY_GROUP_ESTABLISHED:
600
500
logger.debug(u"Service established.")
601
501
elif state == avahi.ENTRY_GROUP_COLLISION:
602
logger.warning(u"Service name collision.")
603
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)
604
515
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))
516
logger.error(u"Error in group state changed %s",
517
unicode(error))
518
killme(1)
519
608
520
609
521
def if_nametoindex(interface):
610
"""Call the C function if_nametoindex(), or equivalent"""
611
global if_nametoindex
522
"""Call the C function if_nametoindex()"""
612
523
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
524
libc = ctypes.cdll.LoadLibrary("libc.so.6")
525
return libc.if_nametoindex(interface)
617
526
except (OSError, AttributeError):
618
527
if "struct" not in sys.modules:
619
528
import struct
620
529
if "fcntl" not in sys.modules:
621
530
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):
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):
635
541
"""See daemon(3). Standard BSD Unix function.
636
542
This should really exist as os.daemon, but it doesn't (yet)."""
637
543
if os.fork():
639
545
os.setsid()
640
546
if not nochdir:
641
547
os.chdir("/")
642
if os.fork():
643
sys.exit()
644
548
if not noclose:
645
549
# Close all standard open file descriptors
646
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
550
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
647
551
if not stat.S_ISCHR(os.fstat(null).st_mode):
648
552
raise OSError(errno.ENODEV,
649
553
"/dev/null not a character device")
654
558
os.close(null)
655
559
656
560
657
def main():
658
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
659
572
main_loop_started = False
660
661
parser = OptionParser(version = "%%prog %s" % version)
573
parser = OptionParser()
662
574
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",
575
default=None, metavar="IF",
576
help="Bind to interface IF")
577
parser.add_option("-p", "--port", type="int", default=None,
667
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")
668
585
parser.add_option("--check", action="store_true", default=False,
669
586
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")
587
parser.add_option("--debug", action="store_true", default=False,
588
help="Debug mode")
681
589
(options, args) = parser.parse_args()
682
590
683
591
if options.check:
685
593
doctest.testmod()
686
594
sys.exit()
687
595
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
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
751
613
DBusGMainLoop(set_as_default=True )
752
614
main_loop = gobject.MainLoop()
753
615
bus = dbus.SystemBus()
756
618
avahi.DBUS_INTERFACE_SERVER )
757
619
# End of Avahi example code
758
620
621
debug = options.debug
622
623
if debug:
624
console = logging.StreamHandler()
625
# console.setLevel(logging.DEBUG)
626
console.setFormatter(logging.Formatter\
627
('%(levelname)s: %(message)s'))
628
logger.addHandler(console)
629
del console
630
759
631
clients = Set()
760
632
def remove_from_clients(client):
761
633
clients.remove(client)
762
634
if not clients:
763
logger.critical(u"No clients left, exiting")
764
sys.exit()
635
logger.debug(u"No clients left, exiting")
636
killme()
765
637
766
clients.update(Set(Client(name = section,
638
clients.update(Set(Client(name=section, options=options,
767
639
stop_hook = remove_from_clients,
768
config
769
= dict(client_config.items(section)))
640
**(dict(client_config\
641
.items(section))))
770
642
for section in client_config.sections()))
771
if not clients:
772
logger.critical(u"No clients defined")
773
sys.exit(1)
774
643
775
644
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())
645
daemon(False, False)
789
646
790
647
def cleanup():
791
648
"Cleanup function; run on exit"
792
649
global group
793
# From the Avahi example code
650
# From the Avahi server example code
794
651
if not group is None:
795
652
group.Free()
796
653
group = None
797
654
# End of Avahi example code
798
655
799
while clients:
800
client = clients.pop()
656
for client in clients:
801
657
client.stop_hook = None
802
658
client.stop()
803
659
805
661
806
662
if not debug:
807
663
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())
664
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
665
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
810
666
811
667
for client in clients:
812
668
client.start()
813
669
814
tcp_server = IPv6_TCPServer((server_settings["address"],
815
server_settings["port"]),
670
tcp_server = IPv6_TCPServer((None, options.port),
816
671
tcp_handler,
817
settings=server_settings,
672
options=options,
818
673
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
826
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")
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:
842
695
main_loop_started = True
843
696
main_loop.run()
844
except AvahiError, error:
845
logger.critical(u"AvahiError: %s" + unicode(error))
846
sys.exit(1)
847
697
except KeyboardInterrupt:
848
698
if debug:
849
699
print
850
851
if __name__ == '__main__':
852
main()
700
701
sys.exit(exitstatus)
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0