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- Committer: Teddy Hogeborn
- Date: 2008-08-10 17:52:54 UTC
- Revision ID: teddy@fukt.bsnet.se-20080810175254-pxjzwws523ji49n7
* Makefile (DOCBOOKTOMAN): Do not generate AUTHORS section.
- 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
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
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
45
164
# End of Avahi example code
46
165
47
166
52
171
fingerprint: string (40 or 32 hexadecimal digits); used to
53
172
uniquely identify the client
54
173
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
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
60
179
interval: datetime.timedelta(); How often to start a new checker
61
180
stop_hook: If set, called by stop() as stop_hook(self)
62
181
checker: subprocess.Popen(); a running checker process used
63
182
to see if the client lives.
64
Is None if no process is running.
183
'None' if no process is running.
65
184
checker_initiator_tag: a gobject event source tag, or None
66
185
stop_initiator_tag: - '' -
67
186
checker_callback_tag: - '' -
68
187
checker_command: string; External command which is run to check if
69
client lives. %()s expansions are done at
188
client lives. %() expansions are done at
70
189
runtime with vars(self) as dict, so that for
71
190
instance %(name)s can be used in the command.
72
191
Private attibutes:
73
192
_timeout: Real variable for 'timeout'
74
193
_interval: Real variable for 'interval'
75
_timeout_milliseconds: Used by gobject.timeout_add()
194
_timeout_milliseconds: Used when calling gobject.timeout_add()
76
195
_interval_milliseconds: - '' -
77
196
"""
78
197
def _set_timeout(self, timeout):
98
217
interval = property(lambda self: self._interval,
99
218
_set_interval)
100
219
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):
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."""
104
224
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)
225
logger.debug(u"Creating client %r", self.name)
226
# Uppercase and remove spaces from fingerprint for later
227
# comparison purposes with return value from the fingerprint()
228
# function
229
self.fingerprint = config["fingerprint"].upper()\
230
.replace(u" ", u"")
231
logger.debug(u" Fingerprint: %s", self.fingerprint)
232
if "secret" in config:
233
self.secret = config["secret"].decode(u"base64")
234
elif "secfile" in config:
235
sf = open(config["secfile"])
113
236
self.secret = sf.read()
114
237
sf.close()
115
238
else:
116
raise RuntimeError(u"No secret or secfile for client %s"
117
% self.name)
118
self.fqdn = fqdn # string
239
raise TypeError(u"No secret or secfile for client %s"
240
% self.name)
241
self.host = config.get("host", "")
119
242
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
243
self.last_checked_ok = None
244
self.timeout = string_to_delta(config["timeout"])
245
self.interval = string_to_delta(config["interval"])
129
246
self.stop_hook = stop_hook
130
247
self.checker = None
131
248
self.checker_initiator_tag = None
132
249
self.stop_initiator_tag = None
133
250
self.checker_callback_tag = None
134
self.check_command = checker
251
self.check_command = config["checker"]
135
252
def start(self):
136
"""Start this clients checker and timeout hooks"""
253
"""Start this client's checker and timeout hooks"""
137
254
# Schedule a new checker to be started an 'interval' from now,
138
255
# and every interval from then on.
139
256
self.checker_initiator_tag = gobject.timeout_add\
147
264
self.stop)
148
265
def stop(self):
149
266
"""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:
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):
156
276
gobject.source_remove(self.stop_initiator_tag)
157
277
self.stop_initiator_tag = None
158
if self.checker_initiator_tag:
278
if getattr(self, "checker_initiator_tag", False):
159
279
gobject.source_remove(self.checker_initiator_tag)
160
280
self.checker_initiator_tag = None
161
281
self.stop_checker()
164
284
# Do not run this again if called by a gobject.timeout_add
165
285
return False
166
286
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()
287
self.stop_hook = None
288
self.stop()
177
289
def checker_callback(self, pid, condition):
178
290
"""The checker has completed, so take appropriate actions."""
179
291
now = datetime.datetime.now()
292
self.checker_callback_tag = None
293
self.checker = None
180
294
if os.WIFEXITED(condition) \
181
295
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
296
logger.info(u"Checker for %(name)s succeeded",
297
vars(self))
298
self.last_checked_ok = now
186
299
gobject.source_remove(self.stop_initiator_tag)
187
300
self.stop_initiator_tag = gobject.timeout_add\
188
301
(self._timeout_milliseconds,
189
302
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
303
elif not os.WIFEXITED(condition):
304
logger.warning(u"Checker for %(name)s crashed?",
305
vars(self))
306
else:
307
logger.info(u"Checker for %(name)s failed",
308
vars(self))
199
309
def start_checker(self):
200
310
"""Start a new checker subprocess if one is not running.
201
311
If a checker already exists, leave it running and do
202
312
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.
203
321
if self.checker is None:
204
if debug:
205
sys.stderr.write(u"Starting checker for %s\n"
206
% self.name)
207
322
try:
208
command = self.check_command % self.fqdn
323
# In case check_command has exactly one % operator
324
command = self.check_command % self.host
209
325
except TypeError:
326
# Escape attributes for the shell
210
327
escaped_attrs = dict((key, re.escape(str(val)))
211
328
for key, val in
212
329
vars(self).iteritems())
213
command = self.check_command % escaped_attrs
330
try:
331
command = self.check_command % escaped_attrs
332
except TypeError, error:
333
logger.error(u'Could not format string "%s":'
334
u' %s', self.check_command, error)
335
return True # Try again later
214
336
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)
337
logger.info(u"Starting checker %r for %s",
338
command, self.name)
339
self.checker = subprocess.Popen(command,
340
close_fds=True,
341
shell=True, cwd="/")
342
self.checker_callback_tag = gobject.child_watch_add\
343
(self.checker.pid,
344
self.checker_callback)
224
345
except subprocess.OSError, error:
225
sys.stderr.write(u"Failed to start subprocess: %s\n"
226
% error)
346
logger.error(u"Failed to start subprocess: %s",
347
error)
227
348
# Re-run this periodically if run by gobject.timeout_add
228
349
return True
229
350
def stop_checker(self):
230
351
"""Force the checker process, if any, to stop."""
231
if not hasattr(self, "checker") or self.checker is None:
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:
232
356
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)
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
238
366
self.checker = None
239
def still_valid(self, now=None):
367
def still_valid(self):
240
368
"""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:
369
now = datetime.datetime.now()
370
if self.last_checked_ok is None:
244
371
return now < (self.created + self.timeout)
245
372
else:
246
return now < (self.last_seen + self.timeout)
373
return now < (self.last_checked_ok + self.timeout)
247
374
248
375
249
376
def peer_certificate(session):
377
"Return the peer's OpenPGP certificate as a bytestring"
250
378
# If not an OpenPGP certificate...
251
379
if gnutls.library.functions.gnutls_certificate_type_get\
252
380
(session._c_object) \
263
391
264
392
265
393
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))
394
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
270
395
# New GnuTLS "datum" with the OpenPGP public key
271
396
datum = gnutls.library.types.gnutls_datum_t\
272
397
(ctypes.cast(ctypes.c_char_p(openpgp),
273
398
ctypes.POINTER(ctypes.c_ubyte)),
274
399
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))
275
404
# 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)
405
gnutls.library.functions.gnutls_openpgp_crt_import\
406
(crt, ctypes.byref(datum),
407
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
280
408
# New buffer for the fingerprint
281
409
buffer = ctypes.create_string_buffer(20)
282
410
buffer_length = ctypes.c_size_t()
298
426
Note: This will run in its own forked process."""
299
427
300
428
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())
429
logger.info(u"TCP connection from: %s",
430
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.
310
447
311
448
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
312
449
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
313
450
# "+DHE-DSS"))
314
priority = "SECURE256"
315
451
priority = "NORMAL" # Fallback default, since this
452
# MUST be set.
453
if self.server.settings["priority"]:
454
priority = self.server.settings["priority"]
316
455
gnutls.library.functions.gnutls_priority_set_direct\
317
456
(session._c_object, priority, None);
318
457
319
458
try:
320
459
session.handshake()
321
460
except gnutls.errors.GNUTLSError, error:
322
if debug:
323
sys.stderr.write(u"Handshake failed: %s\n" % error)
461
logger.warning(u"Handshake failed: %s", error)
324
462
# Do not run session.bye() here: the session is not
325
463
# established. Just abandon the request.
326
464
return
327
465
try:
328
466
fpr = fingerprint(peer_certificate(session))
329
467
except (TypeError, gnutls.errors.GNUTLSError), error:
330
if debug:
331
sys.stderr.write(u"Bad certificate: %s\n" % error)
468
logger.warning(u"Bad certificate: %s", error)
332
469
session.bye()
333
470
return
334
if debug:
335
sys.stderr.write(u"Fingerprint: %s\n" % fpr)
471
logger.debug(u"Fingerprint: %s", fpr)
336
472
client = None
337
for c in clients:
473
for c in self.server.clients:
338
474
if c.fingerprint == fpr:
339
475
client = c
340
476
break
477
if not client:
478
logger.warning(u"Client not found for fingerprint: %s",
479
fpr)
480
session.bye()
481
return
341
482
# Have to check if client.still_valid(), since it is possible
342
483
# that the client timed out while establishing the GnuTLS
343
484
# 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)
485
if not client.still_valid():
486
logger.warning(u"Client %(name)s is invalid",
487
vars(client))
352
488
session.bye()
353
489
return
354
490
sent_size = 0
355
491
while sent_size < len(client.secret):
356
492
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)))
493
logger.debug(u"Sent: %d, remaining: %d",
494
sent, len(client.secret)
495
- (sent_size + sent))
361
496
sent_size += sent
362
497
session.bye()
363
498
365
500
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
501
"""IPv6 TCP server. Accepts 'None' as address and/or port.
367
502
Attributes:
368
options: Command line options
503
settings: Server settings
369
504
clients: Set() of Client objects
370
505
"""
371
506
address_family = socket.AF_INET6
372
507
def __init__(self, *args, **kwargs):
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
508
if "settings" in kwargs:
509
self.settings = kwargs["settings"]
510
del kwargs["settings"]
376
511
if "clients" in kwargs:
377
512
self.clients = kwargs["clients"]
378
513
del kwargs["clients"]
381
516
"""This overrides the normal server_bind() function
382
517
to bind to an interface if one was specified, and also NOT to
383
518
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
519
if self.settings["interface"]:
520
# 25 is from /usr/include/asm-i486/socket.h
521
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
388
522
try:
389
523
self.socket.setsockopt(socket.SOL_SOCKET,
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
524
SO_BINDTODEVICE,
525
self.settings["interface"])
392
526
except socket.error, error:
393
527
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)
528
logger.error(u"No permission to"
529
u" bind to interface %s",
530
self.settings["interface"])
397
531
else:
398
532
raise error
399
533
# Only bind(2) the socket if we really need to.
402
536
in6addr_any = "::"
403
537
self.server_address = (in6addr_any,
404
538
self.server_address[1])
405
elif self.server_address[1] is None:
539
elif not self.server_address[1]:
406
540
self.server_address = (self.server_address[0],
407
541
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"]))
408
549
return super(type(self), self).server_bind()
409
550
410
551
442
583
return delta
443
584
444
585
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
586
def server_state_changed(state):
480
"""From the Avahi server example code"""
587
"""Derived from the Avahi example code"""
481
588
if state == avahi.SERVER_COLLISION:
482
sys.stderr.write(u"WARNING: Server name collision\n")
483
remove_service()
589
logger.error(u"Server name collision")
590
service.remove()
484
591
elif state == avahi.SERVER_RUNNING:
485
add_service()
592
service.add()
486
593
487
594
488
595
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)
596
"""Derived from the Avahi example code"""
597
logger.debug(u"state change: %i", state)
494
598
495
599
if state == avahi.ENTRY_GROUP_ESTABLISHED:
496
if debug:
497
sys.stderr.write(u"Service established.\n")
600
logger.debug(u"Service established.")
498
601
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()
602
logger.warning(u"Service name collision.")
603
service.rename()
513
604
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
605
logger.critical(u"Error in group state changed %s",
606
unicode(error))
607
raise AvahiGroupError("State changed: %s", str(error))
519
608
520
609
def if_nametoindex(interface):
521
"""Call the C function if_nametoindex()"""
610
"""Call the C function if_nametoindex(), or equivalent"""
611
global if_nametoindex
522
612
try:
523
libc = ctypes.cdll.LoadLibrary("libc.so.6")
524
return libc.if_nametoindex(interface)
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
525
617
except (OSError, AttributeError):
526
618
if "struct" not in sys.modules:
527
619
import struct
528
620
if "fcntl" not in sys.modules:
529
621
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()
622
def if_nametoindex(interface):
623
"Get an interface index the hard way, i.e. using fcntl()"
624
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
625
s = socket.socket()
626
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
627
struct.pack("16s16x", interface))
628
s.close()
629
interface_index = struct.unpack("I", ifreq[16:20])[0]
630
return interface_index
631
return if_nametoindex(interface)
632
633
634
def daemon(nochdir = False, noclose = False):
635
"""See daemon(3). Standard BSD Unix function.
636
This should really exist as os.daemon, but it doesn't (yet)."""
637
if os.fork():
638
sys.exit()
639
os.setsid()
640
if not nochdir:
641
os.chdir("/")
642
if os.fork():
643
sys.exit()
644
if not noclose:
645
# Close all standard open file descriptors
646
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
647
if not stat.S_ISCHR(os.fstat(null).st_mode):
648
raise OSError(errno.ENODEV,
649
"/dev/null not a character device")
650
os.dup2(null, sys.stdin.fileno())
651
os.dup2(null, sys.stdout.fileno())
652
os.dup2(null, sys.stderr.fileno())
653
if null > 2:
654
os.close(null)
655
656
657
def main():
658
global main_loop_started
659
main_loop_started = False
660
661
parser = OptionParser(version = "%%prog %s" % version)
541
662
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,
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",
557
667
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
668
parser.add_option("--check", action="store_true", default=False,
565
669
help="Run self-test")
566
parser.add_option("--debug", action="store_true", default=False,
567
help="Debug mode")
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")
568
681
(options, args) = parser.parse_args()
569
682
570
683
if options.check:
572
685
doctest.testmod()
573
686
sys.exit()
574
687
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
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
592
751
DBusGMainLoop(set_as_default=True )
593
752
main_loop = gobject.MainLoop()
594
753
bus = dbus.SystemBus()
597
756
avahi.DBUS_INTERFACE_SERVER )
598
757
# End of Avahi example code
599
758
600
debug = options.debug
601
602
759
clients = Set()
603
760
def remove_from_clients(client):
604
761
clients.remove(client)
605
762
if not clients:
606
if debug:
607
sys.stderr.write(u"No clients left, exiting\n")
608
main_loop.quit()
763
logger.critical(u"No clients left, exiting")
764
sys.exit()
609
765
610
clients.update(Set(Client(name=section, options=options,
766
clients.update(Set(Client(name = section,
611
767
stop_hook = remove_from_clients,
612
**(dict(client_config\
613
.items(section))))
768
config
769
= dict(client_config.items(section)))
614
770
for section in client_config.sections()))
771
if not clients:
772
logger.critical(u"No clients defined")
773
sys.exit(1)
774
775
if not debug:
776
logger.removeHandler(console)
777
daemon()
778
779
pidfilename = "/var/run/mandos/mandos.pid"
780
pid = os.getpid()
781
try:
782
pidfile = open(pidfilename, "w")
783
pidfile.write(str(pid) + "\n")
784
pidfile.close()
785
del pidfile
786
except IOError, err:
787
logger.error(u"Could not write %s file with PID %d",
788
pidfilename, os.getpid())
789
790
def cleanup():
791
"Cleanup function; run on exit"
792
global group
793
# From the Avahi example code
794
if not group is None:
795
group.Free()
796
group = None
797
# End of Avahi example code
798
799
while clients:
800
client = clients.pop()
801
client.stop_hook = None
802
client.stop()
803
804
atexit.register(cleanup)
805
806
if not debug:
807
signal.signal(signal.SIGINT, signal.SIG_IGN)
808
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
809
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
810
615
811
for client in clients:
616
812
client.start()
617
813
618
tcp_server = IPv6_TCPServer((None, options.port),
814
tcp_server = IPv6_TCPServer((server_settings["address"],
815
server_settings["port"]),
619
816
tcp_handler,
620
options=options,
817
settings=server_settings,
621
818
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)
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
639
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")
842
main_loop_started = True
640
843
main_loop.run()
844
except AvahiError, error:
845
logger.critical(u"AvahiError: %s" + unicode(error))
846
sys.exit(1)
641
847
except KeyboardInterrupt:
642
print
643
644
# Cleanup here
848
if debug:
849
print
645
850
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()
851
if __name__ == '__main__':
852
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0