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- Committer: Teddy Hogeborn
- Date: 2008-08-18 05:57:11 UTC
- Revision ID: teddy@fukt.bsnet.se-20080818055711-2rpzat3hkbq3us62
No code or documentation changes.
- files added:
- COPYING
- plugins.d
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- files modified:
- Makefile
added
removed
mandos
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".
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#
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
15
#
16
# This program is free software: you can redistribute it and/or modify
17
# it under the terms of the GNU General Public License as published by
18
# the Free Software Foundation, either version 3 of the License, or
19
# (at your option) any later version.
20
#
21
# This program is distributed in the hope that it will be useful,
22
# but WITHOUT ANY WARRANTY; without even the implied warranty of
23
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24
# GNU General Public License for more details.
25
#
26
# You should have received a copy of the GNU General Public License
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
28
#
29
# Contact the authors at <mandos@fukt.bsnet.se>.
30
#
2
31
3
32
from __future__ import division
4
33
21
50
import signal
22
51
from sets import Set
23
52
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
24
57
25
58
import dbus
26
59
import gobject
28
61
from dbus.mainloop.glib import DBusGMainLoop
29
62
import ctypes
30
63
31
# This variable is used to optionally bind to a specified interface.
32
# It is a global variable to fit in with the other variables from the
33
# Avahi server example code.
34
serviceInterface = avahi.IF_UNSPEC
35
# From the Avahi server example code:
36
serviceName = "Mandos"
37
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
38
servicePort = None # Not known at startup
39
serviceTXT = [] # TXT record for the service
40
domain = "" # Domain to publish on, default to .local
41
host = "" # Host to publish records for, default to localhost
42
group = None #our entry group
43
rename_count = 12 # Counter so we only rename after collisions a
44
# sensible number of times
64
version = "1.0"
65
66
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
self.max_renames = max_renames
123
def rename(self):
124
"""Derived from the Avahi example code"""
125
if self.rename_count >= self.max_renames:
126
logger.critical(u"No suitable service name found after %i"
127
u" retries, exiting.", rename_count)
128
raise AvahiServiceError("Too many renames")
129
self.name = server.GetAlternativeServiceName(self.name)
130
logger.info(u"Changing name to %r ...", str(self.name))
131
syslogger.setFormatter(logging.Formatter\
132
('Mandos (%s): %%(levelname)s:'
133
' %%(message)s' % self.name))
134
self.remove()
135
self.add()
136
self.rename_count += 1
137
def remove(self):
138
"""Derived from the Avahi example code"""
139
if group is not None:
140
group.Reset()
141
def add(self):
142
"""Derived from the Avahi example code"""
143
global group
144
if group is None:
145
group = dbus.Interface\
146
(bus.get_object(avahi.DBUS_NAME,
147
server.EntryGroupNew()),
148
avahi.DBUS_INTERFACE_ENTRY_GROUP)
149
group.connect_to_signal('StateChanged',
150
entry_group_state_changed)
151
logger.debug(u"Adding service '%s' of type '%s' ...",
152
service.name, service.type)
153
group.AddService(
154
self.interface, # interface
155
avahi.PROTO_INET6, # protocol
156
dbus.UInt32(0), # flags
157
self.name, self.type,
158
self.domain, self.host,
159
dbus.UInt16(self.port),
160
avahi.string_array_to_txt_array(self.TXT))
161
group.Commit()
162
163
# From the Avahi example code:
164
group = None # our entry group
45
165
# End of Avahi example code
46
166
47
167
52
172
fingerprint: string (40 or 32 hexadecimal digits); used to
53
173
uniquely identify the client
54
174
secret: bytestring; sent verbatim (over TLS) to client
55
fqdn: string (FQDN); available for use by the checker command
56
created: datetime.datetime()
57
last_seen: datetime.datetime() or None if not yet seen
58
timeout: datetime.timedelta(); How long from last_seen until
59
this client is invalid
175
host: string; available for use by the checker command
176
created: datetime.datetime(); object creation, not client host
177
last_checked_ok: datetime.datetime() or None if not yet checked OK
178
timeout: datetime.timedelta(); How long from last_checked_ok
179
until this client is invalid
60
180
interval: datetime.timedelta(); How often to start a new checker
61
181
stop_hook: If set, called by stop() as stop_hook(self)
62
182
checker: subprocess.Popen(); a running checker process used
63
183
to see if the client lives.
64
Is None if no process is running.
184
'None' if no process is running.
65
185
checker_initiator_tag: a gobject event source tag, or None
66
186
stop_initiator_tag: - '' -
67
187
checker_callback_tag: - '' -
68
188
checker_command: string; External command which is run to check if
69
client lives. %()s expansions are done at
189
client lives. %() expansions are done at
70
190
runtime with vars(self) as dict, so that for
71
191
instance %(name)s can be used in the command.
72
192
Private attibutes:
73
193
_timeout: Real variable for 'timeout'
74
194
_interval: Real variable for 'interval'
75
_timeout_milliseconds: Used by gobject.timeout_add()
195
_timeout_milliseconds: Used when calling gobject.timeout_add()
76
196
_interval_milliseconds: - '' -
77
197
"""
78
198
def _set_timeout(self, timeout):
98
218
interval = property(lambda self: self._interval,
99
219
_set_interval)
100
220
del _set_interval
101
def __init__(self, name=None, options=None, stop_hook=None,
102
fingerprint=None, secret=None, secfile=None, fqdn=None,
103
timeout=None, interval=-1, checker=None):
221
def __init__(self, name = None, stop_hook=None, config={}):
222
"""Note: the 'checker' key in 'config' sets the
223
'checker_command' attribute and *not* the 'checker'
224
attribute."""
104
225
self.name = name
105
# Uppercase and remove spaces from fingerprint
106
# for later comparison purposes with return value of
107
# the fingerprint() function
108
self.fingerprint = fingerprint.upper().replace(u" ", u"")
109
if secret:
110
self.secret = secret.decode(u"base64")
111
elif secfile:
112
sf = open(secfile)
226
logger.debug(u"Creating client %r", self.name)
227
# Uppercase and remove spaces from fingerprint for later
228
# comparison purposes with return value from the fingerprint()
229
# function
230
self.fingerprint = config["fingerprint"].upper()\
231
.replace(u" ", u"")
232
logger.debug(u" Fingerprint: %s", self.fingerprint)
233
if "secret" in config:
234
self.secret = config["secret"].decode(u"base64")
235
elif "secfile" in config:
236
sf = open(config["secfile"])
113
237
self.secret = sf.read()
114
238
sf.close()
115
239
else:
116
raise RuntimeError(u"No secret or secfile for client %s"
117
% self.name)
118
self.fqdn = fqdn # string
240
raise TypeError(u"No secret or secfile for client %s"
241
% self.name)
242
self.host = config.get("host", "")
119
243
self.created = datetime.datetime.now()
120
self.last_seen = None
121
if timeout is None:
122
timeout = options.timeout
123
self.timeout = timeout
124
if interval == -1:
125
interval = options.interval
126
else:
127
interval = string_to_delta(interval)
128
self.interval = interval
244
self.last_checked_ok = None
245
self.timeout = string_to_delta(config["timeout"])
246
self.interval = string_to_delta(config["interval"])
129
247
self.stop_hook = stop_hook
130
248
self.checker = None
131
249
self.checker_initiator_tag = None
132
250
self.stop_initiator_tag = None
133
251
self.checker_callback_tag = None
134
self.check_command = checker
252
self.check_command = config["checker"]
135
253
def start(self):
136
"""Start this clients checker and timeout hooks"""
254
"""Start this client's checker and timeout hooks"""
137
255
# Schedule a new checker to be started an 'interval' from now,
138
256
# and every interval from then on.
139
257
self.checker_initiator_tag = gobject.timeout_add\
147
265
self.stop)
148
266
def stop(self):
149
267
"""Stop this client.
150
The possibility that this client might be restarted is left
151
open, but not currently used."""
152
if debug:
153
sys.stderr.write(u"Stopping client %s\n" % self.name)
154
self.secret = None
155
if self.stop_initiator_tag:
268
The possibility that a client might be restarted is left open,
269
but not currently used."""
270
# If this client doesn't have a secret, it is already stopped.
271
if hasattr(self, "secret") and self.secret:
272
logger.info(u"Stopping client %s", self.name)
273
self.secret = None
274
else:
275
return False
276
if getattr(self, "stop_initiator_tag", False):
156
277
gobject.source_remove(self.stop_initiator_tag)
157
278
self.stop_initiator_tag = None
158
if self.checker_initiator_tag:
279
if getattr(self, "checker_initiator_tag", False):
159
280
gobject.source_remove(self.checker_initiator_tag)
160
281
self.checker_initiator_tag = None
161
282
self.stop_checker()
164
285
# Do not run this again if called by a gobject.timeout_add
165
286
return False
166
287
def __del__(self):
167
# Some code duplication here and in stop()
168
if hasattr(self, "stop_initiator_tag") \
169
and self.stop_initiator_tag:
170
gobject.source_remove(self.stop_initiator_tag)
171
self.stop_initiator_tag = None
172
if hasattr(self, "checker_initiator_tag") \
173
and self.checker_initiator_tag:
174
gobject.source_remove(self.checker_initiator_tag)
175
self.checker_initiator_tag = None
176
self.stop_checker()
288
self.stop_hook = None
289
self.stop()
177
290
def checker_callback(self, pid, condition):
178
291
"""The checker has completed, so take appropriate actions."""
179
292
now = datetime.datetime.now()
293
self.checker_callback_tag = None
294
self.checker = None
180
295
if os.WIFEXITED(condition) \
181
296
and (os.WEXITSTATUS(condition) == 0):
182
if debug:
183
sys.stderr.write(u"Checker for %(name)s succeeded\n"
184
% vars(self))
185
self.last_seen = now
297
logger.info(u"Checker for %(name)s succeeded",
298
vars(self))
299
self.last_checked_ok = now
186
300
gobject.source_remove(self.stop_initiator_tag)
187
301
self.stop_initiator_tag = gobject.timeout_add\
188
302
(self._timeout_milliseconds,
189
303
self.stop)
190
elif debug:
191
if not os.WIFEXITED(condition):
192
sys.stderr.write(u"Checker for %(name)s crashed?\n"
193
% vars(self))
194
else:
195
sys.stderr.write(u"Checker for %(name)s failed\n"
196
% vars(self))
197
self.checker = None
198
self.checker_callback_tag = None
304
elif not os.WIFEXITED(condition):
305
logger.warning(u"Checker for %(name)s crashed?",
306
vars(self))
307
else:
308
logger.info(u"Checker for %(name)s failed",
309
vars(self))
199
310
def start_checker(self):
200
311
"""Start a new checker subprocess if one is not running.
201
312
If a checker already exists, leave it running and do
202
313
nothing."""
314
# The reason for not killing a running checker is that if we
315
# did that, then if a checker (for some reason) started
316
# running slowly and taking more than 'interval' time, the
317
# client would inevitably timeout, since no checker would get
318
# a chance to run to completion. If we instead leave running
319
# checkers alone, the checker would have to take more time
320
# than 'timeout' for the client to be declared invalid, which
321
# is as it should be.
203
322
if self.checker is None:
204
if debug:
205
sys.stderr.write(u"Starting checker for %s\n"
206
% self.name)
207
323
try:
208
command = self.check_command % self.fqdn
324
# In case check_command has exactly one % operator
325
command = self.check_command % self.host
209
326
except TypeError:
327
# Escape attributes for the shell
210
328
escaped_attrs = dict((key, re.escape(str(val)))
211
329
for key, val in
212
330
vars(self).iteritems())
213
command = self.check_command % escaped_attrs
331
try:
332
command = self.check_command % escaped_attrs
333
except TypeError, error:
334
logger.error(u'Could not format string "%s":'
335
u' %s', self.check_command, error)
336
return True # Try again later
214
337
try:
215
self.checker = subprocess.\
216
Popen(command,
217
stdout=subprocess.PIPE,
218
close_fds=True, shell=True,
219
cwd="/")
220
self.checker_callback_tag = gobject.\
221
child_watch_add(self.checker.pid,
222
self.\
223
checker_callback)
338
logger.info(u"Starting checker %r for %s",
339
command, self.name)
340
self.checker = subprocess.Popen(command,
341
close_fds=True,
342
shell=True, cwd="/")
343
self.checker_callback_tag = gobject.child_watch_add\
344
(self.checker.pid,
345
self.checker_callback)
224
346
except subprocess.OSError, error:
225
sys.stderr.write(u"Failed to start subprocess: %s\n"
226
% error)
347
logger.error(u"Failed to start subprocess: %s",
348
error)
227
349
# Re-run this periodically if run by gobject.timeout_add
228
350
return True
229
351
def stop_checker(self):
230
352
"""Force the checker process, if any, to stop."""
231
if not hasattr(self, "checker") or self.checker is None:
353
if self.checker_callback_tag:
354
gobject.source_remove(self.checker_callback_tag)
355
self.checker_callback_tag = None
356
if getattr(self, "checker", None) is None:
232
357
return
233
gobject.source_remove(self.checker_callback_tag)
234
self.checker_callback_tag = None
235
os.kill(self.checker.pid, signal.SIGTERM)
236
if self.checker.poll() is None:
237
os.kill(self.checker.pid, signal.SIGKILL)
358
logger.debug(u"Stopping checker for %(name)s", vars(self))
359
try:
360
os.kill(self.checker.pid, signal.SIGTERM)
361
#os.sleep(0.5)
362
#if self.checker.poll() is None:
363
# os.kill(self.checker.pid, signal.SIGKILL)
364
except OSError, error:
365
if error.errno != errno.ESRCH: # No such process
366
raise
238
367
self.checker = None
239
def still_valid(self, now=None):
368
def still_valid(self):
240
369
"""Has the timeout not yet passed for this client?"""
241
if now is None:
242
now = datetime.datetime.now()
243
if self.last_seen is None:
370
now = datetime.datetime.now()
371
if self.last_checked_ok is None:
244
372
return now < (self.created + self.timeout)
245
373
else:
246
return now < (self.last_seen + self.timeout)
374
return now < (self.last_checked_ok + self.timeout)
247
375
248
376
249
377
def peer_certificate(session):
378
"Return the peer's OpenPGP certificate as a bytestring"
250
379
# If not an OpenPGP certificate...
251
380
if gnutls.library.functions.gnutls_certificate_type_get\
252
381
(session._c_object) \
263
392
264
393
265
394
def fingerprint(openpgp):
266
# New empty GnuTLS certificate
267
crt = gnutls.library.types.gnutls_openpgp_crt_t()
268
gnutls.library.functions.gnutls_openpgp_crt_init\
269
(ctypes.byref(crt))
395
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
270
396
# New GnuTLS "datum" with the OpenPGP public key
271
397
datum = gnutls.library.types.gnutls_datum_t\
272
398
(ctypes.cast(ctypes.c_char_p(openpgp),
273
399
ctypes.POINTER(ctypes.c_ubyte)),
274
400
ctypes.c_uint(len(openpgp)))
401
# New empty GnuTLS certificate
402
crt = gnutls.library.types.gnutls_openpgp_crt_t()
403
gnutls.library.functions.gnutls_openpgp_crt_init\
404
(ctypes.byref(crt))
275
405
# Import the OpenPGP public key into the certificate
276
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
277
(crt,
278
ctypes.byref(datum),
279
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
406
gnutls.library.functions.gnutls_openpgp_crt_import\
407
(crt, ctypes.byref(datum),
408
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
280
409
# New buffer for the fingerprint
281
410
buffer = ctypes.create_string_buffer(20)
282
411
buffer_length = ctypes.c_size_t()
298
427
Note: This will run in its own forked process."""
299
428
300
429
def handle(self):
301
if debug:
302
sys.stderr.write(u"TCP request came\n")
303
sys.stderr.write(u"Request: %s\n" % self.request)
304
sys.stderr.write(u"Client Address: %s\n"
305
% unicode(self.client_address))
306
sys.stderr.write(u"Server: %s\n" % self.server)
307
session = gnutls.connection.ClientSession(self.request,
308
gnutls.connection.\
309
X509Credentials())
430
logger.info(u"TCP connection from: %s",
431
unicode(self.client_address))
432
session = gnutls.connection.ClientSession\
433
(self.request, gnutls.connection.X509Credentials())
434
435
line = self.request.makefile().readline()
436
logger.debug(u"Protocol version: %r", line)
437
try:
438
if int(line.strip().split()[0]) > 1:
439
raise RuntimeError
440
except (ValueError, IndexError, RuntimeError), error:
441
logger.error(u"Unknown protocol version: %s", error)
442
return
443
444
# Note: gnutls.connection.X509Credentials is really a generic
445
# GnuTLS certificate credentials object so long as no X.509
446
# keys are added to it. Therefore, we can use it here despite
447
# using OpenPGP certificates.
310
448
311
449
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
312
450
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
313
451
# "+DHE-DSS"))
314
priority = "SECURE256"
315
452
priority = "NORMAL" # Fallback default, since this
453
# MUST be set.
454
if self.server.settings["priority"]:
455
priority = self.server.settings["priority"]
316
456
gnutls.library.functions.gnutls_priority_set_direct\
317
457
(session._c_object, priority, None);
318
458
319
459
try:
320
460
session.handshake()
321
461
except gnutls.errors.GNUTLSError, error:
322
if debug:
323
sys.stderr.write(u"Handshake failed: %s\n" % error)
462
logger.warning(u"Handshake failed: %s", error)
324
463
# Do not run session.bye() here: the session is not
325
464
# established. Just abandon the request.
326
465
return
327
466
try:
328
467
fpr = fingerprint(peer_certificate(session))
329
468
except (TypeError, gnutls.errors.GNUTLSError), error:
330
if debug:
331
sys.stderr.write(u"Bad certificate: %s\n" % error)
469
logger.warning(u"Bad certificate: %s", error)
332
470
session.bye()
333
471
return
334
if debug:
335
sys.stderr.write(u"Fingerprint: %s\n" % fpr)
472
logger.debug(u"Fingerprint: %s", fpr)
336
473
client = None
337
for c in clients:
474
for c in self.server.clients:
338
475
if c.fingerprint == fpr:
339
476
client = c
340
477
break
478
if not client:
479
logger.warning(u"Client not found for fingerprint: %s",
480
fpr)
481
session.bye()
482
return
341
483
# Have to check if client.still_valid(), since it is possible
342
484
# that the client timed out while establishing the GnuTLS
343
485
# session.
344
if (not client) or (not client.still_valid()):
345
if debug:
346
if client:
347
sys.stderr.write(u"Client %(name)s is invalid\n"
348
% vars(client))
349
else:
350
sys.stderr.write(u"Client not found for "
351
u"fingerprint: %s\n" % fpr)
486
if not client.still_valid():
487
logger.warning(u"Client %(name)s is invalid",
488
vars(client))
352
489
session.bye()
353
490
return
354
491
sent_size = 0
355
492
while sent_size < len(client.secret):
356
493
sent = session.send(client.secret[sent_size:])
357
if debug:
358
sys.stderr.write(u"Sent: %d, remaining: %d\n"
359
% (sent, len(client.secret)
360
- (sent_size + sent)))
494
logger.debug(u"Sent: %d, remaining: %d",
495
sent, len(client.secret)
496
- (sent_size + sent))
361
497
sent_size += sent
362
498
session.bye()
363
499
365
501
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
502
"""IPv6 TCP server. Accepts 'None' as address and/or port.
367
503
Attributes:
368
options: Command line options
504
settings: Server settings
369
505
clients: Set() of Client objects
370
506
"""
371
507
address_family = socket.AF_INET6
372
508
def __init__(self, *args, **kwargs):
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
509
if "settings" in kwargs:
510
self.settings = kwargs["settings"]
511
del kwargs["settings"]
376
512
if "clients" in kwargs:
377
513
self.clients = kwargs["clients"]
378
514
del kwargs["clients"]
381
517
"""This overrides the normal server_bind() function
382
518
to bind to an interface if one was specified, and also NOT to
383
519
bind to an address or port if they were not specified."""
384
if self.options.interface:
385
if not hasattr(socket, "SO_BINDTODEVICE"):
386
# From /usr/include/asm-i486/socket.h
387
socket.SO_BINDTODEVICE = 25
520
if self.settings["interface"]:
521
# 25 is from /usr/include/asm-i486/socket.h
522
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
388
523
try:
389
524
self.socket.setsockopt(socket.SOL_SOCKET,
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
525
SO_BINDTODEVICE,
526
self.settings["interface"])
392
527
except socket.error, error:
393
528
if error[0] == errno.EPERM:
394
sys.stderr.write(u"Warning: No permission to" \
395
u" bind to interface %s\n"
396
% self.options.interface)
529
logger.error(u"No permission to"
530
u" bind to interface %s",
531
self.settings["interface"])
397
532
else:
398
533
raise error
399
534
# Only bind(2) the socket if we really need to.
402
537
in6addr_any = "::"
403
538
self.server_address = (in6addr_any,
404
539
self.server_address[1])
405
elif self.server_address[1] is None:
540
elif not self.server_address[1]:
406
541
self.server_address = (self.server_address[0],
407
542
0)
543
# if self.settings["interface"]:
544
# self.server_address = (self.server_address[0],
545
# 0, # port
546
# 0, # flowinfo
547
# if_nametoindex
548
# (self.settings
549
# ["interface"]))
408
550
return super(type(self), self).server_bind()
409
551
410
552
442
584
return delta
443
585
444
586
445
def add_service():
446
"""From the Avahi server example code"""
447
global group, serviceName, serviceType, servicePort, serviceTXT, \
448
domain, host
449
if group is None:
450
group = dbus.Interface(
451
bus.get_object( avahi.DBUS_NAME,
452
server.EntryGroupNew()),
453
avahi.DBUS_INTERFACE_ENTRY_GROUP)
454
group.connect_to_signal('StateChanged',
455
entry_group_state_changed)
456
if debug:
457
sys.stderr.write(u"Adding service '%s' of type '%s' ...\n"
458
% (serviceName, serviceType))
459
460
group.AddService(
461
serviceInterface, # interface
462
avahi.PROTO_INET6, # protocol
463
dbus.UInt32(0), # flags
464
serviceName, serviceType,
465
domain, host,
466
dbus.UInt16(servicePort),
467
avahi.string_array_to_txt_array(serviceTXT))
468
group.Commit()
469
470
471
def remove_service():
472
"""From the Avahi server example code"""
473
global group
474
475
if not group is None:
476
group.Reset()
477
478
479
587
def server_state_changed(state):
480
"""From the Avahi server example code"""
588
"""Derived from the Avahi example code"""
481
589
if state == avahi.SERVER_COLLISION:
482
sys.stderr.write(u"WARNING: Server name collision\n")
483
remove_service()
590
logger.error(u"Server name collision")
591
service.remove()
484
592
elif state == avahi.SERVER_RUNNING:
485
add_service()
593
service.add()
486
594
487
595
488
596
def entry_group_state_changed(state, error):
489
"""From the Avahi server example code"""
490
global serviceName, server, rename_count
491
492
if debug:
493
sys.stderr.write(u"state change: %i\n" % state)
597
"""Derived from the Avahi example code"""
598
logger.debug(u"state change: %i", state)
494
599
495
600
if state == avahi.ENTRY_GROUP_ESTABLISHED:
496
if debug:
497
sys.stderr.write(u"Service established.\n")
601
logger.debug(u"Service established.")
498
602
elif state == avahi.ENTRY_GROUP_COLLISION:
499
500
rename_count = rename_count - 1
501
if rename_count > 0:
502
name = server.GetAlternativeServiceName(name)
503
sys.stderr.write(u"WARNING: Service name collision, "
504
u"changing name to '%s' ...\n" % name)
505
remove_service()
506
add_service()
507
508
else:
509
sys.stderr.write(u"ERROR: No suitable service name found "
510
u"after %i retries, exiting.\n"
511
% n_rename)
512
main_loop.quit()
603
logger.warning(u"Service name collision.")
604
service.rename()
513
605
elif state == avahi.ENTRY_GROUP_FAILURE:
514
sys.stderr.write(u"Error in group state changed %s\n"
515
% unicode(error))
516
main_loop.quit()
517
return
518
606
logger.critical(u"Error in group state changed %s",
607
unicode(error))
608
raise AvahiGroupError("State changed: %s", str(error))
519
609
520
610
def if_nametoindex(interface):
521
"""Call the C function if_nametoindex()"""
611
"""Call the C function if_nametoindex(), or equivalent"""
612
global if_nametoindex
522
613
try:
523
libc = ctypes.cdll.LoadLibrary("libc.so.6")
524
return libc.if_nametoindex(interface)
614
if "ctypes.util" not in sys.modules:
615
import ctypes.util
616
if_nametoindex = ctypes.cdll.LoadLibrary\
617
(ctypes.util.find_library("c")).if_nametoindex
525
618
except (OSError, AttributeError):
526
619
if "struct" not in sys.modules:
527
620
import struct
528
621
if "fcntl" not in sys.modules:
529
622
import fcntl
530
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
531
s = socket.socket()
532
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
533
struct.pack("16s16x", interface))
534
s.close()
535
interface_index = struct.unpack("I", ifreq[16:20])[0]
536
return interface_index
537
538
539
if __name__ == '__main__':
540
parser = OptionParser()
623
def if_nametoindex(interface):
624
"Get an interface index the hard way, i.e. using fcntl()"
625
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
626
s = socket.socket()
627
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
628
struct.pack("16s16x", interface))
629
s.close()
630
interface_index = struct.unpack("I", ifreq[16:20])[0]
631
return interface_index
632
return if_nametoindex(interface)
633
634
635
def daemon(nochdir = False, noclose = False):
636
"""See daemon(3). Standard BSD Unix function.
637
This should really exist as os.daemon, but it doesn't (yet)."""
638
if os.fork():
639
sys.exit()
640
os.setsid()
641
if not nochdir:
642
os.chdir("/")
643
if os.fork():
644
sys.exit()
645
if not noclose:
646
# Close all standard open file descriptors
647
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
648
if not stat.S_ISCHR(os.fstat(null).st_mode):
649
raise OSError(errno.ENODEV,
650
"/dev/null not a character device")
651
os.dup2(null, sys.stdin.fileno())
652
os.dup2(null, sys.stdout.fileno())
653
os.dup2(null, sys.stderr.fileno())
654
if null > 2:
655
os.close(null)
656
657
658
def main():
659
global main_loop_started
660
main_loop_started = False
661
662
parser = OptionParser(version = "%%prog %s" % version)
541
663
parser.add_option("-i", "--interface", type="string",
542
default=None, metavar="IF",
543
help="Bind to interface IF")
544
parser.add_option("--cert", type="string", default="cert.pem",
545
metavar="FILE",
546
help="Public key certificate PEM file to use")
547
parser.add_option("--key", type="string", default="key.pem",
548
metavar="FILE",
549
help="Private key PEM file to use")
550
parser.add_option("--ca", type="string", default="ca.pem",
551
metavar="FILE",
552
help="Certificate Authority certificate PEM file to use")
553
parser.add_option("--crl", type="string", default="crl.pem",
554
metavar="FILE",
555
help="Certificate Revokation List PEM file to use")
556
parser.add_option("-p", "--port", type="int", default=None,
664
metavar="IF", help="Bind to interface IF")
665
parser.add_option("-a", "--address", type="string",
666
help="Address to listen for requests on")
667
parser.add_option("-p", "--port", type="int",
557
668
help="Port number to receive requests on")
558
parser.add_option("--timeout", type="string", # Parsed later
559
default="1h",
560
help="Amount of downtime allowed for clients")
561
parser.add_option("--interval", type="string", # Parsed later
562
default="5m",
563
help="How often to check that a client is up")
564
669
parser.add_option("--check", action="store_true", default=False,
565
670
help="Run self-test")
566
parser.add_option("--debug", action="store_true", default=False,
567
help="Debug mode")
671
parser.add_option("--debug", action="store_true",
672
help="Debug mode; run in foreground and log to"
673
" terminal")
674
parser.add_option("--priority", type="string", help="GnuTLS"
675
" priority string (see GnuTLS documentation)")
676
parser.add_option("--servicename", type="string", metavar="NAME",
677
help="Zeroconf service name")
678
parser.add_option("--configdir", type="string",
679
default="/etc/mandos", metavar="DIR",
680
help="Directory to search for configuration"
681
" files")
568
682
(options, args) = parser.parse_args()
569
683
570
684
if options.check:
572
686
doctest.testmod()
573
687
sys.exit()
574
688
575
# Parse the time arguments
576
try:
577
options.timeout = string_to_delta(options.timeout)
578
except ValueError:
579
parser.error("option --timeout: Unparseable time")
580
try:
581
options.interval = string_to_delta(options.interval)
582
except ValueError:
583
parser.error("option --interval: Unparseable time")
584
585
# Parse config file
586
defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
587
client_config = ConfigParser.SafeConfigParser(defaults)
588
#client_config.readfp(open("secrets.conf"), "secrets.conf")
589
client_config.read("mandos-clients.conf")
590
591
# From the Avahi server example code
689
# Default values for config file for server-global settings
690
server_defaults = { "interface": "",
691
"address": "",
692
"port": "",
693
"debug": "False",
694
"priority":
695
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
696
"servicename": "Mandos",
697
}
698
699
# Parse config file for server-global settings
700
server_config = ConfigParser.SafeConfigParser(server_defaults)
701
del server_defaults
702
server_config.read(os.path.join(options.configdir, "mandos.conf"))
703
server_section = "server"
704
# Convert the SafeConfigParser object to a dict
705
server_settings = dict(server_config.items(server_section))
706
# Use getboolean on the boolean config option
707
server_settings["debug"] = server_config.getboolean\
708
(server_section, "debug")
709
del server_config
710
711
# Override the settings from the config file with command line
712
# options, if set.
713
for option in ("interface", "address", "port", "debug",
714
"priority", "servicename", "configdir"):
715
value = getattr(options, option)
716
if value is not None:
717
server_settings[option] = value
718
del options
719
# Now we have our good server settings in "server_settings"
720
721
debug = server_settings["debug"]
722
723
if not debug:
724
syslogger.setLevel(logging.WARNING)
725
console.setLevel(logging.WARNING)
726
727
if server_settings["servicename"] != "Mandos":
728
syslogger.setFormatter(logging.Formatter\
729
('Mandos (%s): %%(levelname)s:'
730
' %%(message)s'
731
% server_settings["servicename"]))
732
733
# Parse config file with clients
734
client_defaults = { "timeout": "1h",
735
"interval": "5m",
736
"checker": "fping -q -- %%(host)s",
737
}
738
client_config = ConfigParser.SafeConfigParser(client_defaults)
739
client_config.read(os.path.join(server_settings["configdir"],
740
"clients.conf"))
741
742
global service
743
service = AvahiService(name = server_settings["servicename"],
744
type = "_mandos._tcp", );
745
if server_settings["interface"]:
746
service.interface = if_nametoindex(server_settings["interface"])
747
748
global main_loop
749
global bus
750
global server
751
# From the Avahi example code
592
752
DBusGMainLoop(set_as_default=True )
593
753
main_loop = gobject.MainLoop()
594
754
bus = dbus.SystemBus()
597
757
avahi.DBUS_INTERFACE_SERVER )
598
758
# End of Avahi example code
599
759
600
debug = options.debug
601
602
760
clients = Set()
603
761
def remove_from_clients(client):
604
762
clients.remove(client)
605
763
if not clients:
606
if debug:
607
sys.stderr.write(u"No clients left, exiting\n")
608
main_loop.quit()
764
logger.critical(u"No clients left, exiting")
765
sys.exit()
609
766
610
clients.update(Set(Client(name=section, options=options,
767
clients.update(Set(Client(name = section,
611
768
stop_hook = remove_from_clients,
612
**(dict(client_config\
613
.items(section))))
769
config
770
= dict(client_config.items(section)))
614
771
for section in client_config.sections()))
772
if not clients:
773
logger.critical(u"No clients defined")
774
sys.exit(1)
775
776
if not debug:
777
logger.removeHandler(console)
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())
790
791
def cleanup():
792
"Cleanup function; run on exit"
793
global group
794
# From the Avahi example code
795
if not group is None:
796
group.Free()
797
group = None
798
# End of Avahi example code
799
800
while clients:
801
client = clients.pop()
802
client.stop_hook = None
803
client.stop()
804
805
atexit.register(cleanup)
806
807
if not debug:
808
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())
811
615
812
for client in clients:
616
813
client.start()
617
814
618
tcp_server = IPv6_TCPServer((None, options.port),
815
tcp_server = IPv6_TCPServer((server_settings["address"],
816
server_settings["port"]),
619
817
tcp_handler,
620
options=options,
818
settings=server_settings,
621
819
clients=clients)
622
# Find out what random port we got
623
servicePort = tcp_server.socket.getsockname()[1]
624
if debug:
625
sys.stderr.write(u"Now listening on port %d\n" % servicePort)
626
627
if options.interface is not None:
628
serviceInterface = if_nametoindex(options.interface)
629
630
# From the Avahi server example code
631
server.connect_to_signal("StateChanged", server_state_changed)
632
server_state_changed(server.GetState())
633
# End of Avahi example code
634
635
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
636
lambda *args, **kwargs:
637
tcp_server.handle_request(*args[2:],
638
**kwargs) or True)
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
639
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")
843
main_loop_started = True
640
844
main_loop.run()
845
except AvahiError, error:
846
logger.critical(u"AvahiError: %s" + unicode(error))
847
sys.exit(1)
641
848
except KeyboardInterrupt:
642
print
643
644
# Cleanup here
849
if debug:
850
print
645
851
646
# From the Avahi server example code
647
if not group is None:
648
group.Free()
649
# End of Avahi example code
650
651
for client in clients:
652
client.stop_hook = None
653
client.stop()
852
if __name__ == '__main__':
853
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0