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- Committer: Teddy Hogeborn
- Date: 2008-08-09 15:56:13 UTC
- mfrom: (24.1.29 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080809155613-pm1o10yh44nafc0g
Merge.
- files added:
- mandos-client.c
- 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".
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
#
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
65
logger = logging.Logger('mandos')
66
syslogger = logging.handlers.SysLogHandler\
67
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
68
address = "/dev/log")
69
syslogger.setFormatter(logging.Formatter\
70
('Mandos: %(levelname)s: %(message)s'))
71
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
45
159
# End of Avahi example code
46
160
47
161
52
166
fingerprint: string (40 or 32 hexadecimal digits); used to
53
167
uniquely identify the client
54
168
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
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
60
174
interval: datetime.timedelta(); How often to start a new checker
61
175
stop_hook: If set, called by stop() as stop_hook(self)
62
176
checker: subprocess.Popen(); a running checker process used
63
177
to see if the client lives.
64
Is None if no process is running.
178
'None' if no process is running.
65
179
checker_initiator_tag: a gobject event source tag, or None
66
180
stop_initiator_tag: - '' -
67
181
checker_callback_tag: - '' -
68
182
checker_command: string; External command which is run to check if
69
client lives. %()s expansions are done at
183
client lives. %() expansions are done at
70
184
runtime with vars(self) as dict, so that for
71
185
instance %(name)s can be used in the command.
72
186
Private attibutes:
73
187
_timeout: Real variable for 'timeout'
74
188
_interval: Real variable for 'interval'
75
_timeout_milliseconds: Used by gobject.timeout_add()
189
_timeout_milliseconds: Used when calling gobject.timeout_add()
76
190
_interval_milliseconds: - '' -
77
191
"""
78
192
def _set_timeout(self, timeout):
98
212
interval = property(lambda self: self._interval,
99
213
_set_interval)
100
214
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):
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."""
104
219
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)
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"])
113
231
self.secret = sf.read()
114
232
sf.close()
115
233
else:
116
raise RuntimeError(u"No secret or secfile for client %s"
117
% self.name)
118
self.fqdn = fqdn # string
234
raise TypeError(u"No secret or secfile for client %s"
235
% self.name)
236
self.host = config.get("host", "")
119
237
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
238
self.last_checked_ok = None
239
self.timeout = string_to_delta(config["timeout"])
240
self.interval = string_to_delta(config["interval"])
129
241
self.stop_hook = stop_hook
130
242
self.checker = None
131
243
self.checker_initiator_tag = None
132
244
self.stop_initiator_tag = None
133
245
self.checker_callback_tag = None
134
self.check_command = checker
246
self.check_command = config["checker"]
135
247
def start(self):
136
"""Start this clients checker and timeout hooks"""
248
"""Start this client's checker and timeout hooks"""
137
249
# Schedule a new checker to be started an 'interval' from now,
138
250
# and every interval from then on.
139
251
self.checker_initiator_tag = gobject.timeout_add\
147
259
self.stop)
148
260
def stop(self):
149
261
"""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:
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):
156
271
gobject.source_remove(self.stop_initiator_tag)
157
272
self.stop_initiator_tag = None
158
if self.checker_initiator_tag:
273
if getattr(self, "checker_initiator_tag", False):
159
274
gobject.source_remove(self.checker_initiator_tag)
160
275
self.checker_initiator_tag = None
161
276
self.stop_checker()
164
279
# Do not run this again if called by a gobject.timeout_add
165
280
return False
166
281
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()
282
self.stop_hook = None
283
self.stop()
177
284
def checker_callback(self, pid, condition):
178
285
"""The checker has completed, so take appropriate actions."""
179
286
now = datetime.datetime.now()
287
self.checker_callback_tag = None
288
self.checker = None
180
289
if os.WIFEXITED(condition) \
181
290
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
291
logger.info(u"Checker for %(name)s succeeded",
292
vars(self))
293
self.last_checked_ok = now
186
294
gobject.source_remove(self.stop_initiator_tag)
187
295
self.stop_initiator_tag = gobject.timeout_add\
188
296
(self._timeout_milliseconds,
189
297
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
298
elif not os.WIFEXITED(condition):
299
logger.warning(u"Checker for %(name)s crashed?",
300
vars(self))
301
else:
302
logger.info(u"Checker for %(name)s failed",
303
vars(self))
199
304
def start_checker(self):
200
305
"""Start a new checker subprocess if one is not running.
201
306
If a checker already exists, leave it running and do
202
307
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.
203
316
if self.checker is None:
204
if debug:
205
sys.stderr.write(u"Starting checker for %s\n"
206
% self.name)
207
317
try:
208
command = self.check_command % self.fqdn
318
# In case check_command has exactly one % operator
319
command = self.check_command % self.host
209
320
except TypeError:
321
# Escape attributes for the shell
210
322
escaped_attrs = dict((key, re.escape(str(val)))
211
323
for key, val in
212
324
vars(self).iteritems())
213
command = self.check_command % escaped_attrs
325
try:
326
command = self.check_command % escaped_attrs
327
except TypeError, error:
328
logger.error(u'Could not format string "%s":'
329
u' %s', self.check_command, error)
330
return True # Try again later
214
331
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)
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="/")
337
self.checker_callback_tag = gobject.child_watch_add\
338
(self.checker.pid,
339
self.checker_callback)
224
340
except subprocess.OSError, error:
225
sys.stderr.write(u"Failed to start subprocess: %s\n"
226
% error)
341
logger.error(u"Failed to start subprocess: %s",
342
error)
227
343
# Re-run this periodically if run by gobject.timeout_add
228
344
return True
229
345
def stop_checker(self):
230
346
"""Force the checker process, if any, to stop."""
231
if not hasattr(self, "checker") or self.checker is None:
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:
232
351
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)
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
238
361
self.checker = None
239
def still_valid(self, now=None):
362
def still_valid(self):
240
363
"""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:
364
now = datetime.datetime.now()
365
if self.last_checked_ok is None:
244
366
return now < (self.created + self.timeout)
245
367
else:
246
return now < (self.last_seen + self.timeout)
368
return now < (self.last_checked_ok + self.timeout)
247
369
248
370
249
371
def peer_certificate(session):
372
"Return the peer's OpenPGP certificate as a bytestring"
250
373
# If not an OpenPGP certificate...
251
374
if gnutls.library.functions.gnutls_certificate_type_get\
252
375
(session._c_object) \
263
386
264
387
265
388
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))
389
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
270
390
# New GnuTLS "datum" with the OpenPGP public key
271
391
datum = gnutls.library.types.gnutls_datum_t\
272
392
(ctypes.cast(ctypes.c_char_p(openpgp),
273
393
ctypes.POINTER(ctypes.c_ubyte)),
274
394
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))
275
399
# 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)
400
gnutls.library.functions.gnutls_openpgp_crt_import\
401
(crt, ctypes.byref(datum),
402
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
280
403
# New buffer for the fingerprint
281
404
buffer = ctypes.create_string_buffer(20)
282
405
buffer_length = ctypes.c_size_t()
298
421
Note: This will run in its own forked process."""
299
422
300
423
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())
424
logger.info(u"TCP connection from: %s",
425
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.
310
442
311
443
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
312
444
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
313
445
# "+DHE-DSS"))
314
priority = "SECURE256"
315
446
priority = "NORMAL" # Fallback default, since this
447
# MUST be set.
448
if self.server.settings["priority"]:
449
priority = self.server.settings["priority"]
316
450
gnutls.library.functions.gnutls_priority_set_direct\
317
451
(session._c_object, priority, None);
318
452
319
453
try:
320
454
session.handshake()
321
455
except gnutls.errors.GNUTLSError, error:
322
if debug:
323
sys.stderr.write(u"Handshake failed: %s\n" % error)
456
logger.warning(u"Handshake failed: %s", error)
324
457
# Do not run session.bye() here: the session is not
325
458
# established. Just abandon the request.
326
459
return
327
460
try:
328
461
fpr = fingerprint(peer_certificate(session))
329
462
except (TypeError, gnutls.errors.GNUTLSError), error:
330
if debug:
331
sys.stderr.write(u"Bad certificate: %s\n" % error)
463
logger.warning(u"Bad certificate: %s", error)
332
464
session.bye()
333
465
return
334
if debug:
335
sys.stderr.write(u"Fingerprint: %s\n" % fpr)
466
logger.debug(u"Fingerprint: %s", fpr)
336
467
client = None
337
for c in clients:
468
for c in self.server.clients:
338
469
if c.fingerprint == fpr:
339
470
client = c
340
471
break
472
if not client:
473
logger.warning(u"Client not found for fingerprint: %s",
474
fpr)
475
session.bye()
476
return
341
477
# Have to check if client.still_valid(), since it is possible
342
478
# that the client timed out while establishing the GnuTLS
343
479
# 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)
480
if not client.still_valid():
481
logger.warning(u"Client %(name)s is invalid",
482
vars(client))
352
483
session.bye()
353
484
return
354
485
sent_size = 0
355
486
while sent_size < len(client.secret):
356
487
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)))
488
logger.debug(u"Sent: %d, remaining: %d",
489
sent, len(client.secret)
490
- (sent_size + sent))
361
491
sent_size += sent
362
492
session.bye()
363
493
365
495
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
496
"""IPv6 TCP server. Accepts 'None' as address and/or port.
367
497
Attributes:
368
options: Command line options
498
settings: Server settings
369
499
clients: Set() of Client objects
370
500
"""
371
501
address_family = socket.AF_INET6
372
502
def __init__(self, *args, **kwargs):
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
503
if "settings" in kwargs:
504
self.settings = kwargs["settings"]
505
del kwargs["settings"]
376
506
if "clients" in kwargs:
377
507
self.clients = kwargs["clients"]
378
508
del kwargs["clients"]
381
511
"""This overrides the normal server_bind() function
382
512
to bind to an interface if one was specified, and also NOT to
383
513
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
514
if self.settings["interface"]:
515
# 25 is from /usr/include/asm-i486/socket.h
516
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
388
517
try:
389
518
self.socket.setsockopt(socket.SOL_SOCKET,
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
519
SO_BINDTODEVICE,
520
self.settings["interface"])
392
521
except socket.error, error:
393
522
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)
523
logger.error(u"No permission to"
524
u" bind to interface %s",
525
self.settings["interface"])
397
526
else:
398
527
raise error
399
528
# Only bind(2) the socket if we really need to.
402
531
in6addr_any = "::"
403
532
self.server_address = (in6addr_any,
404
533
self.server_address[1])
405
elif self.server_address[1] is None:
534
elif not self.server_address[1]:
406
535
self.server_address = (self.server_address[0],
407
536
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"]))
408
544
return super(type(self), self).server_bind()
409
545
410
546
442
578
return delta
443
579
444
580
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
581
def server_state_changed(state):
480
"""From the Avahi server example code"""
582
"""Derived from the Avahi example code"""
481
583
if state == avahi.SERVER_COLLISION:
482
sys.stderr.write(u"WARNING: Server name collision\n")
483
remove_service()
584
logger.error(u"Server name collision")
585
service.remove()
484
586
elif state == avahi.SERVER_RUNNING:
485
add_service()
587
service.add()
486
588
487
589
488
590
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)
591
"""Derived from the Avahi example code"""
592
logger.debug(u"state change: %i", state)
494
593
495
594
if state == avahi.ENTRY_GROUP_ESTABLISHED:
496
if debug:
497
sys.stderr.write(u"Service established.\n")
595
logger.debug(u"Service established.")
498
596
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()
597
logger.warning(u"Service name collision.")
598
service.rename()
513
599
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
600
logger.critical(u"Error in group state changed %s",
601
unicode(error))
602
raise AvahiGroupError("State changed: %s", str(error))
519
603
520
604
def if_nametoindex(interface):
521
"""Call the C function if_nametoindex()"""
605
"""Call the C function if_nametoindex(), or equivalent"""
606
global if_nametoindex
522
607
try:
523
libc = ctypes.cdll.LoadLibrary("libc.so.6")
524
return libc.if_nametoindex(interface)
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
525
612
except (OSError, AttributeError):
526
613
if "struct" not in sys.modules:
527
614
import struct
528
615
if "fcntl" not in sys.modules:
529
616
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__':
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):
630
"""See daemon(3). Standard BSD Unix function.
631
This should really exist as os.daemon, but it doesn't (yet)."""
632
if os.fork():
633
sys.exit()
634
os.setsid()
635
if not nochdir:
636
os.chdir("/")
637
if os.fork():
638
sys.exit()
639
if not noclose:
640
# Close all standard open file descriptors
641
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
642
if not stat.S_ISCHR(os.fstat(null).st_mode):
643
raise OSError(errno.ENODEV,
644
"/dev/null not a character device")
645
os.dup2(null, sys.stdin.fileno())
646
os.dup2(null, sys.stdout.fileno())
647
os.dup2(null, sys.stderr.fileno())
648
if null > 2:
649
os.close(null)
650
651
652
def main():
653
global main_loop_started
654
main_loop_started = False
655
540
656
parser = OptionParser()
541
657
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,
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",
557
662
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
663
parser.add_option("--check", action="store_true", default=False,
565
664
help="Run self-test")
566
parser.add_option("--debug", action="store_true", default=False,
567
help="Debug mode")
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")
568
676
(options, args) = parser.parse_args()
569
677
570
678
if options.check:
572
680
doctest.testmod()
573
681
sys.exit()
574
682
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
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
592
745
DBusGMainLoop(set_as_default=True )
593
746
main_loop = gobject.MainLoop()
594
747
bus = dbus.SystemBus()
597
750
avahi.DBUS_INTERFACE_SERVER )
598
751
# End of Avahi example code
599
752
600
debug = options.debug
753
if debug:
754
console = logging.StreamHandler()
755
# console.setLevel(logging.DEBUG)
756
console.setFormatter(logging.Formatter\
757
('%(levelname)s: %(message)s'))
758
logger.addHandler(console)
759
del console
601
760
602
761
clients = Set()
603
762
def remove_from_clients(client):
604
763
clients.remove(client)
605
764
if not clients:
606
if debug:
607
sys.stderr.write(u"No clients left, exiting\n")
608
main_loop.quit()
765
logger.critical(u"No clients left, exiting")
766
sys.exit()
609
767
610
clients.update(Set(Client(name=section, options=options,
768
clients.update(Set(Client(name = section,
611
769
stop_hook = remove_from_clients,
612
**(dict(client_config\
613
.items(section))))
770
config
771
= dict(client_config.items(section)))
614
772
for section in client_config.sections()))
773
if not clients:
774
logger.critical(u"No clients defined")
775
sys.exit(1)
776
777
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())
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