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- Committer: Björn Påhlsson
- Date: 2008-08-10 18:04:51 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 63.
- Revision ID: belorn@braxen-20080810180451-fxxcjsd9xd7p2qah
Added all sections needed for mandos-client manual page
- files added:
- mandos-client.xml
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
mandos
1
1
#!/usr/bin/python
2
# -*- mode: python; coding: utf-8 -*-
3
#
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# 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
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# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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#
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# This program is free software: you can redistribute it and/or modify
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
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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
import logging
32
import logging.handlers
33
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
64
version = "1.0"
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65
36
66
logger = logging.Logger('mandos')
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logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
38
39
# This variable is used to optionally bind to a specified interface.
40
# It is a global variable to fit in with the other variables from the
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# Avahi server example code.
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serviceInterface = avahi.IF_UNSPEC
43
# From the Avahi server example code:
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serviceName = "Mandos"
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
46
servicePort = None # Not known at startup
47
serviceTXT = [] # TXT record for the service
48
domain = "" # Domain to publish on, default to .local
49
host = "" # Host to publish records for, default to localhost
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group = None #our entry group
51
rename_count = 12 # Counter so we only rename after collisions a
52
# sensible number of times
67
syslogger = logging.handlers.SysLogHandler\
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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
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address = "/dev/log")
70
syslogger.setFormatter(logging.Formatter\
71
('Mandos: %(levelname)s: %(message)s'))
72
logger.addHandler(syslogger)
73
74
75
class AvahiError(Exception):
76
def __init__(self, value):
77
self.value = value
78
def __str__(self):
79
return repr(self.value)
80
81
class AvahiServiceError(AvahiError):
82
pass
83
84
class AvahiGroupError(AvahiError):
85
pass
86
87
88
class AvahiService(object):
89
"""An Avahi (Zeroconf) service.
90
Attributes:
91
interface: integer; avahi.IF_UNSPEC or an interface index.
92
Used to optionally bind to the specified interface.
93
name: string; Example: 'Mandos'
94
type: string; Example: '_mandos._tcp'.
95
See <http://www.dns-sd.org/ServiceTypes.html>
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port: integer; what port to announce
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TXT: list of strings; TXT record for the service
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domain: string; Domain to publish on, default to .local if empty.
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host: string; Host to publish records for, default is localhost
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max_renames: integer; maximum number of renames
101
rename_count: integer; counter so we only rename after collisions
102
a sensible number of times
103
"""
104
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
105
type = None, port = None, TXT = None, domain = "",
106
host = "", max_renames = 32768):
107
self.interface = interface
108
self.name = name
109
self.type = type
110
self.port = port
111
if TXT is None:
112
self.TXT = []
113
else:
114
self.TXT = TXT
115
self.domain = domain
116
self.host = host
117
self.rename_count = 0
118
def rename(self):
119
"""Derived from the Avahi example code"""
120
if self.rename_count >= self.max_renames:
121
logger.critical(u"No suitable service name found after %i"
122
u" retries, exiting.", rename_count)
123
raise AvahiServiceError("Too many renames")
124
name = server.GetAlternativeServiceName(name)
125
logger.error(u"Changing name to %r ...", name)
126
syslogger.setFormatter(logging.Formatter\
127
('Mandos (%s): %%(levelname)s:'
128
' %%(message)s' % name))
129
self.remove()
130
self.add()
131
self.rename_count += 1
132
def remove(self):
133
"""Derived from the Avahi example code"""
134
if group is not None:
135
group.Reset()
136
def add(self):
137
"""Derived from the Avahi example code"""
138
global group
139
if group is None:
140
group = dbus.Interface\
141
(bus.get_object(avahi.DBUS_NAME,
142
server.EntryGroupNew()),
143
avahi.DBUS_INTERFACE_ENTRY_GROUP)
144
group.connect_to_signal('StateChanged',
145
entry_group_state_changed)
146
logger.debug(u"Adding service '%s' of type '%s' ...",
147
service.name, service.type)
148
group.AddService(
149
self.interface, # interface
150
avahi.PROTO_INET6, # protocol
151
dbus.UInt32(0), # flags
152
self.name, self.type,
153
self.domain, self.host,
154
dbus.UInt16(self.port),
155
avahi.string_array_to_txt_array(self.TXT))
156
group.Commit()
157
158
# From the Avahi example code:
159
group = None # our entry group
53
160
# End of Avahi example code
54
161
55
162
60
167
fingerprint: string (40 or 32 hexadecimal digits); used to
61
168
uniquely identify the client
62
169
secret: bytestring; sent verbatim (over TLS) to client
63
fqdn: string (FQDN); available for use by the checker command
64
created: datetime.datetime()
65
last_seen: datetime.datetime() or None if not yet seen
66
timeout: datetime.timedelta(); How long from last_seen until
67
this client is invalid
170
host: string; available for use by the checker command
171
created: datetime.datetime(); object creation, not client host
172
last_checked_ok: datetime.datetime() or None if not yet checked OK
173
timeout: datetime.timedelta(); How long from last_checked_ok
174
until this client is invalid
68
175
interval: datetime.timedelta(); How often to start a new checker
69
176
stop_hook: If set, called by stop() as stop_hook(self)
70
177
checker: subprocess.Popen(); a running checker process used
71
178
to see if the client lives.
72
Is None if no process is running.
179
'None' if no process is running.
73
180
checker_initiator_tag: a gobject event source tag, or None
74
181
stop_initiator_tag: - '' -
75
182
checker_callback_tag: - '' -
76
183
checker_command: string; External command which is run to check if
77
client lives. %()s expansions are done at
184
client lives. %() expansions are done at
78
185
runtime with vars(self) as dict, so that for
79
186
instance %(name)s can be used in the command.
80
187
Private attibutes:
81
188
_timeout: Real variable for 'timeout'
82
189
_interval: Real variable for 'interval'
83
_timeout_milliseconds: Used by gobject.timeout_add()
190
_timeout_milliseconds: Used when calling gobject.timeout_add()
84
191
_interval_milliseconds: - '' -
85
192
"""
86
193
def _set_timeout(self, timeout):
106
213
interval = property(lambda self: self._interval,
107
214
_set_interval)
108
215
del _set_interval
109
def __init__(self, name=None, options=None, stop_hook=None,
110
fingerprint=None, secret=None, secfile=None, fqdn=None,
111
timeout=None, interval=-1, checker=None):
216
def __init__(self, name = None, stop_hook=None, config={}):
217
"""Note: the 'checker' key in 'config' sets the
218
'checker_command' attribute and *not* the 'checker'
219
attribute."""
112
220
self.name = name
113
# Uppercase and remove spaces from fingerprint
114
# for later comparison purposes with return value of
115
# the fingerprint() function
116
self.fingerprint = fingerprint.upper().replace(u" ", u"")
117
if secret:
118
self.secret = secret.decode(u"base64")
119
elif secfile:
120
sf = open(secfile)
221
logger.debug(u"Creating client %r", self.name)
222
# Uppercase and remove spaces from fingerprint for later
223
# comparison purposes with return value from the fingerprint()
224
# function
225
self.fingerprint = config["fingerprint"].upper()\
226
.replace(u" ", u"")
227
logger.debug(u" Fingerprint: %s", self.fingerprint)
228
if "secret" in config:
229
self.secret = config["secret"].decode(u"base64")
230
elif "secfile" in config:
231
sf = open(config["secfile"])
121
232
self.secret = sf.read()
122
233
sf.close()
123
234
else:
124
raise RuntimeError(u"No secret or secfile for client %s"
125
% self.name)
126
self.fqdn = fqdn # string
235
raise TypeError(u"No secret or secfile for client %s"
236
% self.name)
237
self.host = config.get("host", "")
127
238
self.created = datetime.datetime.now()
128
self.last_seen = None
129
if timeout is None:
130
timeout = options.timeout
131
self.timeout = timeout
132
if interval == -1:
133
interval = options.interval
134
else:
135
interval = string_to_delta(interval)
136
self.interval = interval
239
self.last_checked_ok = None
240
self.timeout = string_to_delta(config["timeout"])
241
self.interval = string_to_delta(config["interval"])
137
242
self.stop_hook = stop_hook
138
243
self.checker = None
139
244
self.checker_initiator_tag = None
140
245
self.stop_initiator_tag = None
141
246
self.checker_callback_tag = None
142
self.check_command = checker
247
self.check_command = config["checker"]
143
248
def start(self):
144
"""Start this clients checker and timeout hooks"""
249
"""Start this client's checker and timeout hooks"""
145
250
# Schedule a new checker to be started an 'interval' from now,
146
251
# and every interval from then on.
147
252
self.checker_initiator_tag = gobject.timeout_add\
155
260
self.stop)
156
261
def stop(self):
157
262
"""Stop this client.
158
The possibility that this client might be restarted is left
159
open, but not currently used."""
160
logger.debug(u"Stopping client %s", self.name)
161
self.secret = None
162
if self.stop_initiator_tag:
263
The possibility that a client might be restarted is left open,
264
but not currently used."""
265
# If this client doesn't have a secret, it is already stopped.
266
if hasattr(self, "secret") and self.secret:
267
logger.info(u"Stopping client %s", self.name)
268
self.secret = None
269
else:
270
return False
271
if getattr(self, "stop_initiator_tag", False):
163
272
gobject.source_remove(self.stop_initiator_tag)
164
273
self.stop_initiator_tag = None
165
if self.checker_initiator_tag:
274
if getattr(self, "checker_initiator_tag", False):
166
275
gobject.source_remove(self.checker_initiator_tag)
167
276
self.checker_initiator_tag = None
168
277
self.stop_checker()
171
280
# Do not run this again if called by a gobject.timeout_add
172
281
return False
173
282
def __del__(self):
174
# Some code duplication here and in stop()
175
if hasattr(self, "stop_initiator_tag") \
176
and self.stop_initiator_tag:
177
gobject.source_remove(self.stop_initiator_tag)
178
self.stop_initiator_tag = None
179
if hasattr(self, "checker_initiator_tag") \
180
and self.checker_initiator_tag:
181
gobject.source_remove(self.checker_initiator_tag)
182
self.checker_initiator_tag = None
183
self.stop_checker()
283
self.stop_hook = None
284
self.stop()
184
285
def checker_callback(self, pid, condition):
185
286
"""The checker has completed, so take appropriate actions."""
186
287
now = datetime.datetime.now()
288
self.checker_callback_tag = None
289
self.checker = None
187
290
if os.WIFEXITED(condition) \
188
291
and (os.WEXITSTATUS(condition) == 0):
189
logger.debug(u"Checker for %(name)s succeeded",
190
vars(self))
191
self.last_seen = now
292
logger.info(u"Checker for %(name)s succeeded",
293
vars(self))
294
self.last_checked_ok = now
192
295
gobject.source_remove(self.stop_initiator_tag)
193
296
self.stop_initiator_tag = gobject.timeout_add\
194
297
(self._timeout_milliseconds,
195
298
self.stop)
196
if not os.WIFEXITED(condition):
299
elif not os.WIFEXITED(condition):
197
300
logger.warning(u"Checker for %(name)s crashed?",
198
301
vars(self))
199
302
else:
200
logger.debug(u"Checker for %(name)s failed",
201
vars(self))
202
self.checker = None
203
self.checker_callback_tag = None
303
logger.info(u"Checker for %(name)s failed",
304
vars(self))
204
305
def start_checker(self):
205
306
"""Start a new checker subprocess if one is not running.
206
307
If a checker already exists, leave it running and do
207
308
nothing."""
309
# The reason for not killing a running checker is that if we
310
# did that, then if a checker (for some reason) started
311
# running slowly and taking more than 'interval' time, the
312
# client would inevitably timeout, since no checker would get
313
# a chance to run to completion. If we instead leave running
314
# checkers alone, the checker would have to take more time
315
# than 'timeout' for the client to be declared invalid, which
316
# is as it should be.
208
317
if self.checker is None:
209
logger.debug(u"Starting checker for %s",
210
self.name)
211
318
try:
212
command = self.check_command % self.fqdn
319
# In case check_command has exactly one % operator
320
command = self.check_command % self.host
213
321
except TypeError:
322
# Escape attributes for the shell
214
323
escaped_attrs = dict((key, re.escape(str(val)))
215
324
for key, val in
216
325
vars(self).iteritems())
217
326
try:
218
327
command = self.check_command % escaped_attrs
219
328
except TypeError, error:
220
logger.critical(u'Could not format string "%s": %s',
221
self.check_command, error)
329
logger.error(u'Could not format string "%s":'
330
u' %s', self.check_command, error)
222
331
return True # Try again later
223
332
try:
224
self.checker = subprocess.\
225
Popen(command,
226
stdout=subprocess.PIPE,
227
close_fds=True, shell=True,
228
cwd="/")
229
self.checker_callback_tag = gobject.\
230
child_watch_add(self.checker.pid,
231
self.\
232
checker_callback)
333
logger.info(u"Starting checker %r for %s",
334
command, self.name)
335
self.checker = subprocess.Popen(command,
336
close_fds=True,
337
shell=True, cwd="/")
338
self.checker_callback_tag = gobject.child_watch_add\
339
(self.checker.pid,
340
self.checker_callback)
233
341
except subprocess.OSError, error:
234
342
logger.error(u"Failed to start subprocess: %s",
235
343
error)
237
345
return True
238
346
def stop_checker(self):
239
347
"""Force the checker process, if any, to stop."""
240
if not hasattr(self, "checker") or self.checker is None:
348
if self.checker_callback_tag:
349
gobject.source_remove(self.checker_callback_tag)
350
self.checker_callback_tag = None
351
if getattr(self, "checker", None) is None:
241
352
return
242
gobject.source_remove(self.checker_callback_tag)
243
self.checker_callback_tag = None
244
os.kill(self.checker.pid, signal.SIGTERM)
245
if self.checker.poll() is None:
246
os.kill(self.checker.pid, signal.SIGKILL)
353
logger.debug(u"Stopping checker for %(name)s", vars(self))
354
try:
355
os.kill(self.checker.pid, signal.SIGTERM)
356
#os.sleep(0.5)
357
#if self.checker.poll() is None:
358
# os.kill(self.checker.pid, signal.SIGKILL)
359
except OSError, error:
360
if error.errno != errno.ESRCH: # No such process
361
raise
247
362
self.checker = None
248
def still_valid(self, now=None):
363
def still_valid(self):
249
364
"""Has the timeout not yet passed for this client?"""
250
if now is None:
251
now = datetime.datetime.now()
252
if self.last_seen is None:
365
now = datetime.datetime.now()
366
if self.last_checked_ok is None:
253
367
return now < (self.created + self.timeout)
254
368
else:
255
return now < (self.last_seen + self.timeout)
369
return now < (self.last_checked_ok + self.timeout)
256
370
257
371
258
372
def peer_certificate(session):
373
"Return the peer's OpenPGP certificate as a bytestring"
259
374
# If not an OpenPGP certificate...
260
375
if gnutls.library.functions.gnutls_certificate_type_get\
261
376
(session._c_object) \
272
387
273
388
274
389
def fingerprint(openpgp):
275
# New empty GnuTLS certificate
276
crt = gnutls.library.types.gnutls_openpgp_crt_t()
277
gnutls.library.functions.gnutls_openpgp_crt_init\
278
(ctypes.byref(crt))
390
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
279
391
# New GnuTLS "datum" with the OpenPGP public key
280
392
datum = gnutls.library.types.gnutls_datum_t\
281
393
(ctypes.cast(ctypes.c_char_p(openpgp),
282
394
ctypes.POINTER(ctypes.c_ubyte)),
283
395
ctypes.c_uint(len(openpgp)))
396
# New empty GnuTLS certificate
397
crt = gnutls.library.types.gnutls_openpgp_crt_t()
398
gnutls.library.functions.gnutls_openpgp_crt_init\
399
(ctypes.byref(crt))
284
400
# Import the OpenPGP public key into the certificate
285
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
(crt,
287
ctypes.byref(datum),
288
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
401
gnutls.library.functions.gnutls_openpgp_crt_import\
402
(crt, ctypes.byref(datum),
403
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
289
404
# New buffer for the fingerprint
290
405
buffer = ctypes.create_string_buffer(20)
291
406
buffer_length = ctypes.c_size_t()
307
422
Note: This will run in its own forked process."""
308
423
309
424
def handle(self):
310
logger.debug(u"TCP connection from: %s",
425
logger.info(u"TCP connection from: %s",
311
426
unicode(self.client_address))
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
427
session = gnutls.connection.ClientSession\
428
(self.request, gnutls.connection.X509Credentials())
429
430
line = self.request.makefile().readline()
431
logger.debug(u"Protocol version: %r", line)
432
try:
433
if int(line.strip().split()[0]) > 1:
434
raise RuntimeError
435
except (ValueError, IndexError, RuntimeError), error:
436
logger.error(u"Unknown protocol version: %s", error)
437
return
438
439
# Note: gnutls.connection.X509Credentials is really a generic
440
# GnuTLS certificate credentials object so long as no X.509
441
# keys are added to it. Therefore, we can use it here despite
442
# using OpenPGP certificates.
315
443
316
444
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
317
445
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
318
446
# "+DHE-DSS"))
319
priority = "SECURE256"
320
447
priority = "NORMAL" # Fallback default, since this
448
# MUST be set.
449
if self.server.settings["priority"]:
450
priority = self.server.settings["priority"]
321
451
gnutls.library.functions.gnutls_priority_set_direct\
322
452
(session._c_object, priority, None);
323
453
324
454
try:
325
455
session.handshake()
326
456
except gnutls.errors.GNUTLSError, error:
327
logger.debug(u"Handshake failed: %s", error)
457
logger.warning(u"Handshake failed: %s", error)
328
458
# Do not run session.bye() here: the session is not
329
459
# established. Just abandon the request.
330
460
return
331
461
try:
332
462
fpr = fingerprint(peer_certificate(session))
333
463
except (TypeError, gnutls.errors.GNUTLSError), error:
334
logger.debug(u"Bad certificate: %s", error)
464
logger.warning(u"Bad certificate: %s", error)
335
465
session.bye()
336
466
return
337
467
logger.debug(u"Fingerprint: %s", fpr)
338
468
client = None
339
for c in clients:
469
for c in self.server.clients:
340
470
if c.fingerprint == fpr:
341
471
client = c
342
472
break
473
if not client:
474
logger.warning(u"Client not found for fingerprint: %s",
475
fpr)
476
session.bye()
477
return
343
478
# Have to check if client.still_valid(), since it is possible
344
479
# that the client timed out while establishing the GnuTLS
345
480
# session.
346
if (not client) or (not client.still_valid()):
347
if client:
348
logger.debug(u"Client %(name)s is invalid",
349
vars(client))
350
else:
351
logger.debug(u"Client not found for fingerprint: %s",
352
fpr)
481
if not client.still_valid():
482
logger.warning(u"Client %(name)s is invalid",
483
vars(client))
353
484
session.bye()
354
485
return
355
486
sent_size = 0
365
496
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
497
"""IPv6 TCP server. Accepts 'None' as address and/or port.
367
498
Attributes:
368
options: Command line options
499
settings: Server settings
369
500
clients: Set() of Client objects
370
501
"""
371
502
address_family = socket.AF_INET6
372
503
def __init__(self, *args, **kwargs):
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
504
if "settings" in kwargs:
505
self.settings = kwargs["settings"]
506
del kwargs["settings"]
376
507
if "clients" in kwargs:
377
508
self.clients = kwargs["clients"]
378
509
del kwargs["clients"]
381
512
"""This overrides the normal server_bind() function
382
513
to bind to an interface if one was specified, and also NOT to
383
514
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
515
if self.settings["interface"]:
516
# 25 is from /usr/include/asm-i486/socket.h
517
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
388
518
try:
389
519
self.socket.setsockopt(socket.SOL_SOCKET,
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
520
SO_BINDTODEVICE,
521
self.settings["interface"])
392
522
except socket.error, error:
393
523
if error[0] == errno.EPERM:
394
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
524
logger.error(u"No permission to"
525
u" bind to interface %s",
526
self.settings["interface"])
397
527
else:
398
528
raise error
399
529
# Only bind(2) the socket if we really need to.
402
532
in6addr_any = "::"
403
533
self.server_address = (in6addr_any,
404
534
self.server_address[1])
405
elif self.server_address[1] is None:
535
elif not self.server_address[1]:
406
536
self.server_address = (self.server_address[0],
407
537
0)
538
# if self.settings["interface"]:
539
# self.server_address = (self.server_address[0],
540
# 0, # port
541
# 0, # flowinfo
542
# if_nametoindex
543
# (self.settings
544
# ["interface"]))
408
545
return super(type(self), self).server_bind()
409
546
410
547
442
579
return delta
443
580
444
581
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
logger.debug(u"Adding service '%s' of type '%s' ...",
457
serviceName, serviceType)
458
459
group.AddService(
460
serviceInterface, # interface
461
avahi.PROTO_INET6, # protocol
462
dbus.UInt32(0), # flags
463
serviceName, serviceType,
464
domain, host,
465
dbus.UInt16(servicePort),
466
avahi.string_array_to_txt_array(serviceTXT))
467
group.Commit()
468
469
470
def remove_service():
471
"""From the Avahi server example code"""
472
global group
473
474
if not group is None:
475
group.Reset()
476
477
478
582
def server_state_changed(state):
479
"""From the Avahi server example code"""
583
"""Derived from the Avahi example code"""
480
584
if state == avahi.SERVER_COLLISION:
481
logger.warning(u"Server name collision")
482
remove_service()
585
logger.error(u"Server name collision")
586
service.remove()
483
587
elif state == avahi.SERVER_RUNNING:
484
add_service()
588
service.add()
485
589
486
590
487
591
def entry_group_state_changed(state, error):
488
"""From the Avahi server example code"""
489
global serviceName, server, rename_count
490
592
"""Derived from the Avahi example code"""
491
593
logger.debug(u"state change: %i", state)
492
594
493
595
if state == avahi.ENTRY_GROUP_ESTABLISHED:
494
596
logger.debug(u"Service established.")
495
597
elif state == avahi.ENTRY_GROUP_COLLISION:
496
497
rename_count = rename_count - 1
498
if rename_count > 0:
499
name = server.GetAlternativeServiceName(name)
500
logger.warning(u"Service name collision, "
501
u"changing name to '%s' ...", name)
502
remove_service()
503
add_service()
504
505
else:
506
logger.error(u"No suitable service name found "
507
u"after %i retries, exiting.",
508
n_rename)
509
main_loop.quit()
598
logger.warning(u"Service name collision.")
599
service.rename()
510
600
elif state == avahi.ENTRY_GROUP_FAILURE:
511
logger.error(u"Error in group state changed %s",
512
unicode(error))
513
main_loop.quit()
514
return
515
601
logger.critical(u"Error in group state changed %s",
602
unicode(error))
603
raise AvahiGroupError("State changed: %s", str(error))
516
604
517
605
def if_nametoindex(interface):
518
"""Call the C function if_nametoindex()"""
606
"""Call the C function if_nametoindex(), or equivalent"""
607
global if_nametoindex
519
608
try:
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
return libc.if_nametoindex(interface)
609
if "ctypes.util" not in sys.modules:
610
import ctypes.util
611
if_nametoindex = ctypes.cdll.LoadLibrary\
612
(ctypes.util.find_library("c")).if_nametoindex
522
613
except (OSError, AttributeError):
523
614
if "struct" not in sys.modules:
524
615
import struct
525
616
if "fcntl" not in sys.modules:
526
617
import fcntl
527
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
528
s = socket.socket()
529
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
530
struct.pack("16s16x", interface))
531
s.close()
532
interface_index = struct.unpack("I", ifreq[16:20])[0]
533
return interface_index
534
535
536
if __name__ == '__main__':
537
parser = OptionParser()
618
def if_nametoindex(interface):
619
"Get an interface index the hard way, i.e. using fcntl()"
620
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
621
s = socket.socket()
622
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
623
struct.pack("16s16x", interface))
624
s.close()
625
interface_index = struct.unpack("I", ifreq[16:20])[0]
626
return interface_index
627
return if_nametoindex(interface)
628
629
630
def daemon(nochdir = False, noclose = False):
631
"""See daemon(3). Standard BSD Unix function.
632
This should really exist as os.daemon, but it doesn't (yet)."""
633
if os.fork():
634
sys.exit()
635
os.setsid()
636
if not nochdir:
637
os.chdir("/")
638
if os.fork():
639
sys.exit()
640
if not noclose:
641
# Close all standard open file descriptors
642
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
643
if not stat.S_ISCHR(os.fstat(null).st_mode):
644
raise OSError(errno.ENODEV,
645
"/dev/null not a character device")
646
os.dup2(null, sys.stdin.fileno())
647
os.dup2(null, sys.stdout.fileno())
648
os.dup2(null, sys.stderr.fileno())
649
if null > 2:
650
os.close(null)
651
652
653
def main():
654
global main_loop_started
655
main_loop_started = False
656
657
parser = OptionParser(version = "Mandos server %s" % version)
538
658
parser.add_option("-i", "--interface", type="string",
539
default=None, metavar="IF",
540
help="Bind to interface IF")
541
parser.add_option("--cert", type="string", default="cert.pem",
542
metavar="FILE",
543
help="Public key certificate PEM file to use")
544
parser.add_option("--key", type="string", default="key.pem",
545
metavar="FILE",
546
help="Private key PEM file to use")
547
parser.add_option("--ca", type="string", default="ca.pem",
548
metavar="FILE",
549
help="Certificate Authority certificate PEM file to use")
550
parser.add_option("--crl", type="string", default="crl.pem",
551
metavar="FILE",
552
help="Certificate Revokation List PEM file to use")
553
parser.add_option("-p", "--port", type="int", default=None,
659
metavar="IF", help="Bind to interface IF")
660
parser.add_option("-a", "--address", type="string",
661
help="Address to listen for requests on")
662
parser.add_option("-p", "--port", type="int",
554
663
help="Port number to receive requests on")
555
parser.add_option("--timeout", type="string", # Parsed later
556
default="1h",
557
help="Amount of downtime allowed for clients")
558
parser.add_option("--interval", type="string", # Parsed later
559
default="5m",
560
help="How often to check that a client is up")
561
664
parser.add_option("--check", action="store_true", default=False,
562
665
help="Run self-test")
563
parser.add_option("--debug", action="store_true", default=False,
564
help="Debug mode")
666
parser.add_option("--debug", action="store_true",
667
help="Debug mode; run in foreground and log to"
668
" terminal")
669
parser.add_option("--priority", type="string", help="GnuTLS"
670
" priority string (see GnuTLS documentation)")
671
parser.add_option("--servicename", type="string", metavar="NAME",
672
help="Zeroconf service name")
673
parser.add_option("--configdir", type="string",
674
default="/etc/mandos", metavar="DIR",
675
help="Directory to search for configuration"
676
" files")
565
677
(options, args) = parser.parse_args()
566
678
567
679
if options.check:
569
681
doctest.testmod()
570
682
sys.exit()
571
683
572
# Parse the time arguments
573
try:
574
options.timeout = string_to_delta(options.timeout)
575
except ValueError:
576
parser.error("option --timeout: Unparseable time")
577
try:
578
options.interval = string_to_delta(options.interval)
579
except ValueError:
580
parser.error("option --interval: Unparseable time")
581
582
# Parse config file
583
defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
584
client_config = ConfigParser.SafeConfigParser(defaults)
585
#client_config.readfp(open("secrets.conf"), "secrets.conf")
586
client_config.read("mandos-clients.conf")
587
588
# From the Avahi server example code
684
# Default values for config file for server-global settings
685
server_defaults = { "interface": "",
686
"address": "",
687
"port": "",
688
"debug": "False",
689
"priority":
690
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
691
"servicename": "Mandos",
692
}
693
694
# Parse config file for server-global settings
695
server_config = ConfigParser.SafeConfigParser(server_defaults)
696
del server_defaults
697
server_config.read(os.path.join(options.configdir, "mandos.conf"))
698
server_section = "server"
699
# Convert the SafeConfigParser object to a dict
700
server_settings = dict(server_config.items(server_section))
701
# Use getboolean on the boolean config option
702
server_settings["debug"] = server_config.getboolean\
703
(server_section, "debug")
704
del server_config
705
706
# Override the settings from the config file with command line
707
# options, if set.
708
for option in ("interface", "address", "port", "debug",
709
"priority", "servicename", "configdir"):
710
value = getattr(options, option)
711
if value is not None:
712
server_settings[option] = value
713
del options
714
# Now we have our good server settings in "server_settings"
715
716
debug = server_settings["debug"]
717
718
if not debug:
719
syslogger.setLevel(logging.WARNING)
720
721
if server_settings["servicename"] != "Mandos":
722
syslogger.setFormatter(logging.Formatter\
723
('Mandos (%s): %%(levelname)s:'
724
' %%(message)s'
725
% server_settings["servicename"]))
726
727
# Parse config file with clients
728
client_defaults = { "timeout": "1h",
729
"interval": "5m",
730
"checker": "fping -q -- %%(host)s",
731
}
732
client_config = ConfigParser.SafeConfigParser(client_defaults)
733
client_config.read(os.path.join(server_settings["configdir"],
734
"clients.conf"))
735
736
global service
737
service = AvahiService(name = server_settings["servicename"],
738
type = "_mandos._tcp", );
739
if server_settings["interface"]:
740
service.interface = if_nametoindex(server_settings["interface"])
741
742
global main_loop
743
global bus
744
global server
745
# From the Avahi example code
589
746
DBusGMainLoop(set_as_default=True )
590
747
main_loop = gobject.MainLoop()
591
748
bus = dbus.SystemBus()
594
751
avahi.DBUS_INTERFACE_SERVER )
595
752
# End of Avahi example code
596
753
597
debug = options.debug
754
if debug:
755
console = logging.StreamHandler()
756
# console.setLevel(logging.DEBUG)
757
console.setFormatter(logging.Formatter\
758
('%(levelname)s: %(message)s'))
759
logger.addHandler(console)
760
del console
598
761
599
762
clients = Set()
600
763
def remove_from_clients(client):
601
764
clients.remove(client)
602
765
if not clients:
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
766
logger.critical(u"No clients left, exiting")
767
sys.exit()
605
768
606
clients.update(Set(Client(name=section, options=options,
769
clients.update(Set(Client(name = section,
607
770
stop_hook = remove_from_clients,
608
**(dict(client_config\
609
.items(section))))
771
config
772
= dict(client_config.items(section)))
610
773
for section in client_config.sections()))
774
if not clients:
775
logger.critical(u"No clients defined")
776
sys.exit(1)
777
778
if not debug:
779
daemon()
780
781
pidfilename = "/var/run/mandos/mandos.pid"
782
pid = os.getpid()
783
try:
784
pidfile = open(pidfilename, "w")
785
pidfile.write(str(pid) + "\n")
786
pidfile.close()
787
del pidfile
788
except IOError, err:
789
logger.error(u"Could not write %s file with PID %d",
790
pidfilename, os.getpid())
791
792
def cleanup():
793
"Cleanup function; run on exit"
794
global group
795
# From the Avahi example code
796
if not group is None:
797
group.Free()
798
group = None
799
# End of Avahi example code
800
801
while clients:
802
client = clients.pop()
803
client.stop_hook = None
804
client.stop()
805
806
atexit.register(cleanup)
807
808
if not debug:
809
signal.signal(signal.SIGINT, signal.SIG_IGN)
810
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
811
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
812
611
813
for client in clients:
612
814
client.start()
613
815
614
tcp_server = IPv6_TCPServer((None, options.port),
816
tcp_server = IPv6_TCPServer((server_settings["address"],
817
server_settings["port"]),
615
818
tcp_handler,
616
options=options,
819
settings=server_settings,
617
820
clients=clients)
618
# Find out what random port we got
619
servicePort = tcp_server.socket.getsockname()[1]
620
logger.debug(u"Now listening on port %d", servicePort)
621
622
if options.interface is not None:
623
serviceInterface = if_nametoindex(options.interface)
624
625
# From the Avahi server example code
626
server.connect_to_signal("StateChanged", server_state_changed)
627
server_state_changed(server.GetState())
628
# End of Avahi example code
629
630
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
631
lambda *args, **kwargs:
632
tcp_server.handle_request(*args[2:],
633
**kwargs) or True)
821
# Find out what port we got
822
service.port = tcp_server.socket.getsockname()[1]
823
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
824
u" scope_id %d" % tcp_server.socket.getsockname())
825
826
#service.interface = tcp_server.socket.getsockname()[3]
827
634
828
try:
829
# From the Avahi example code
830
server.connect_to_signal("StateChanged", server_state_changed)
831
try:
832
server_state_changed(server.GetState())
833
except dbus.exceptions.DBusException, error:
834
logger.critical(u"DBusException: %s", error)
835
sys.exit(1)
836
# End of Avahi example code
837
838
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
839
lambda *args, **kwargs:
840
tcp_server.handle_request\
841
(*args[2:], **kwargs) or True)
842
843
logger.debug(u"Starting main loop")
844
main_loop_started = True
635
845
main_loop.run()
846
except AvahiError, error:
847
logger.critical(u"AvahiError: %s" + unicode(error))
848
sys.exit(1)
636
849
except KeyboardInterrupt:
637
print
638
639
# Cleanup here
850
if debug:
851
print
640
852
641
# From the Avahi server example code
642
if not group is None:
643
group.Free()
644
# End of Avahi example code
645
646
for client in clients:
647
client.stop_hook = None
648
client.stop()
853
if __name__ == '__main__':
854
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0