To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to server.py
- browse files at revision 17
- compare with another revision
- download diff
- download tarball
- view history from revision 17
- Committer: Teddy Hogeborn
- Date: 2008-07-21 01:52:54 UTC
- mfrom: (15.1.2 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080721015254-5ut0m7j1r4t5x7hj
Merge.
- files added:
- ca.pem
- files removed:
- COPYING
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/password-request.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
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".
9
# following functions: "add_service", "remove_service",
10
# "server_state_changed", "entry_group_state_changed", and some lines
11
# in "main".
12
12
#
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
13
# Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
14
# Påhlsson.
15
15
#
16
16
# This program is free software: you can redistribute it and/or modify
17
17
# it under the terms of the GNU General Public License as published by
26
26
# You should have received a copy of the GNU General Public License
27
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
28
28
#
29
# Contact the authors at <mandos@fukt.bsnet.se>.
29
# Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
30
# <https://www.fukt.bsnet.se/~teddy/>.
30
31
#
31
32
32
33
from __future__ import division
61
62
from dbus.mainloop.glib import DBusGMainLoop
62
63
import ctypes
63
64
64
version = "1.0"
65
# Brief description of the operation of this program:
66
#
67
# This server announces itself as a Zeroconf service. Connecting
68
# clients use the TLS protocol, with the unusual quirk that this
69
# server program acts as a TLS "client" while the connecting clients
70
# acts as a TLS "server". The clients (acting as a TLS "server") must
71
# supply an OpenPGP certificate, and the fingerprint of this
72
# certificate is used by this server to look up (in a list read from a
73
# file at start time) which binary blob to give the client. No other
74
# authentication or authorization is done by this server.
75
65
76
66
77
logger = logging.Logger('mandos')
67
78
syslogger = logging.handlers.SysLogHandler\
68
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
address = "/dev/log")
79
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
70
80
syslogger.setFormatter(logging.Formatter\
71
('Mandos: %(levelname)s: %(message)s'))
81
('%(levelname)s: %(message)s'))
72
82
logger.addHandler(syslogger)
73
74
console = logging.StreamHandler()
75
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
' %(message)s'))
77
logger.addHandler(console)
78
79
class AvahiError(Exception):
80
def __init__(self, value):
81
self.value = value
82
def __str__(self):
83
return repr(self.value)
84
85
class AvahiServiceError(AvahiError):
86
pass
87
88
class AvahiGroupError(AvahiError):
89
pass
90
91
92
class AvahiService(object):
93
"""An Avahi (Zeroconf) service.
94
Attributes:
95
interface: integer; avahi.IF_UNSPEC or an interface index.
96
Used to optionally bind to the specified interface.
97
name: string; Example: 'Mandos'
98
type: string; Example: '_mandos._tcp'.
99
See <http://www.dns-sd.org/ServiceTypes.html>
100
port: integer; what port to announce
101
TXT: list of strings; TXT record for the service
102
domain: string; Domain to publish on, default to .local if empty.
103
host: string; Host to publish records for, default is localhost
104
max_renames: integer; maximum number of renames
105
rename_count: integer; counter so we only rename after collisions
106
a sensible number of times
107
"""
108
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
type = None, port = None, TXT = None, domain = "",
110
host = "", max_renames = 32768):
111
self.interface = interface
112
self.name = name
113
self.type = type
114
self.port = port
115
if TXT is None:
116
self.TXT = []
117
else:
118
self.TXT = TXT
119
self.domain = domain
120
self.host = host
121
self.rename_count = 0
122
self.max_renames = max_renames
123
def rename(self):
124
"""Derived from the Avahi example code"""
125
if self.rename_count >= self.max_renames:
126
logger.critical(u"No suitable service name found after %i"
127
u" retries, exiting.", rename_count)
128
raise AvahiServiceError("Too many renames")
129
self.name = server.GetAlternativeServiceName(self.name)
130
logger.info(u"Changing name to %r ...", str(self.name))
131
syslogger.setFormatter(logging.Formatter\
132
('Mandos (%s): %%(levelname)s:'
133
' %%(message)s' % self.name))
134
self.remove()
135
self.add()
136
self.rename_count += 1
137
def remove(self):
138
"""Derived from the Avahi example code"""
139
if group is not None:
140
group.Reset()
141
def add(self):
142
"""Derived from the Avahi example code"""
143
global group
144
if group is None:
145
group = dbus.Interface\
146
(bus.get_object(avahi.DBUS_NAME,
147
server.EntryGroupNew()),
148
avahi.DBUS_INTERFACE_ENTRY_GROUP)
149
group.connect_to_signal('StateChanged',
150
entry_group_state_changed)
151
logger.debug(u"Adding service '%s' of type '%s' ...",
152
service.name, service.type)
153
group.AddService(
154
self.interface, # interface
155
avahi.PROTO_INET6, # protocol
156
dbus.UInt32(0), # flags
157
self.name, self.type,
158
self.domain, self.host,
159
dbus.UInt16(self.port),
160
avahi.string_array_to_txt_array(self.TXT))
161
group.Commit()
162
83
del syslogger
84
85
# This variable is used to optionally bind to a specified interface.
86
# It is a global variable to fit in with the other variables from the
87
# Avahi example code.
88
serviceInterface = avahi.IF_UNSPEC
163
89
# From the Avahi example code:
164
group = None # our entry group
90
serviceName = "Mandos"
91
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
92
servicePort = None # Not known at startup
93
serviceTXT = [] # TXT record for the service
94
domain = "" # Domain to publish on, default to .local
95
host = "" # Host to publish records for, default to localhost
96
group = None #our entry group
97
rename_count = 12 # Counter so we only rename after collisions a
98
# sensible number of times
165
99
# End of Avahi example code
166
100
167
101
172
106
fingerprint: string (40 or 32 hexadecimal digits); used to
173
107
uniquely identify the client
174
108
secret: bytestring; sent verbatim (over TLS) to client
175
host: string; available for use by the checker command
176
created: datetime.datetime(); object creation, not client host
177
last_checked_ok: datetime.datetime() or None if not yet checked OK
178
timeout: datetime.timedelta(); How long from last_checked_ok
179
until this client is invalid
109
fqdn: string (FQDN); available for use by the checker command
110
created: datetime.datetime()
111
last_seen: datetime.datetime() or None if not yet seen
112
timeout: datetime.timedelta(); How long from last_seen until
113
this client is invalid
180
114
interval: datetime.timedelta(); How often to start a new checker
181
115
stop_hook: If set, called by stop() as stop_hook(self)
182
116
checker: subprocess.Popen(); a running checker process used
183
117
to see if the client lives.
184
'None' if no process is running.
118
Is None if no process is running.
185
119
checker_initiator_tag: a gobject event source tag, or None
186
120
stop_initiator_tag: - '' -
187
121
checker_callback_tag: - '' -
188
122
checker_command: string; External command which is run to check if
189
client lives. %() expansions are done at
123
client lives. %()s expansions are done at
190
124
runtime with vars(self) as dict, so that for
191
125
instance %(name)s can be used in the command.
192
126
Private attibutes:
193
127
_timeout: Real variable for 'timeout'
194
128
_interval: Real variable for 'interval'
195
_timeout_milliseconds: Used when calling gobject.timeout_add()
129
_timeout_milliseconds: Used by gobject.timeout_add()
196
130
_interval_milliseconds: - '' -
197
131
"""
198
132
def _set_timeout(self, timeout):
218
152
interval = property(lambda self: self._interval,
219
153
_set_interval)
220
154
del _set_interval
221
def __init__(self, name = None, stop_hook=None, config={}):
222
"""Note: the 'checker' key in 'config' sets the
223
'checker_command' attribute and *not* the 'checker'
224
attribute."""
155
def __init__(self, name=None, options=None, stop_hook=None,
156
fingerprint=None, secret=None, secfile=None,
157
fqdn=None, timeout=None, interval=-1, checker=None):
158
"""Note: the 'checker' argument sets the 'checker_command'
159
attribute and not the 'checker' attribute.."""
225
160
self.name = name
226
logger.debug(u"Creating client %r", self.name)
227
# Uppercase and remove spaces from fingerprint for later
228
# comparison purposes with return value from the fingerprint()
229
# function
230
self.fingerprint = config["fingerprint"].upper()\
231
.replace(u" ", u"")
232
logger.debug(u" Fingerprint: %s", self.fingerprint)
233
if "secret" in config:
234
self.secret = config["secret"].decode(u"base64")
235
elif "secfile" in config:
236
sf = open(config["secfile"])
161
# Uppercase and remove spaces from fingerprint
162
# for later comparison purposes with return value of
163
# the fingerprint() function
164
self.fingerprint = fingerprint.upper().replace(u" ", u"")
165
if secret:
166
self.secret = secret.decode(u"base64")
167
elif secfile:
168
sf = open(secfile)
237
169
self.secret = sf.read()
238
170
sf.close()
239
171
else:
240
raise TypeError(u"No secret or secfile for client %s"
241
% self.name)
242
self.host = config.get("host", "")
172
raise RuntimeError(u"No secret or secfile for client %s"
173
% self.name)
174
self.fqdn = fqdn # string
243
175
self.created = datetime.datetime.now()
244
self.last_checked_ok = None
245
self.timeout = string_to_delta(config["timeout"])
246
self.interval = string_to_delta(config["interval"])
176
self.last_seen = None
177
if timeout is None:
178
self.timeout = options.timeout
179
else:
180
self.timeout = string_to_delta(timeout)
181
if interval == -1:
182
self.interval = options.interval
183
else:
184
self.interval = string_to_delta(interval)
247
185
self.stop_hook = stop_hook
248
186
self.checker = None
249
187
self.checker_initiator_tag = None
250
188
self.stop_initiator_tag = None
251
189
self.checker_callback_tag = None
252
self.check_command = config["checker"]
190
self.check_command = checker
253
191
def start(self):
254
192
"""Start this client's checker and timeout hooks"""
255
193
# Schedule a new checker to be started an 'interval' from now,
265
203
self.stop)
266
204
def stop(self):
267
205
"""Stop this client.
268
The possibility that a client might be restarted is left open,
269
but not currently used."""
206
The possibility that this client might be restarted is left
207
open, but not currently used."""
270
208
# If this client doesn't have a secret, it is already stopped.
271
if hasattr(self, "secret") and self.secret:
272
logger.info(u"Stopping client %s", self.name)
209
if self.secret:
210
logger.debug(u"Stopping client %s", self.name)
273
211
self.secret = None
274
212
else:
275
213
return False
276
if getattr(self, "stop_initiator_tag", False):
214
if hasattr(self, "stop_initiator_tag") \
215
and self.stop_initiator_tag:
277
216
gobject.source_remove(self.stop_initiator_tag)
278
217
self.stop_initiator_tag = None
279
if getattr(self, "checker_initiator_tag", False):
218
if hasattr(self, "checker_initiator_tag") \
219
and self.checker_initiator_tag:
280
220
gobject.source_remove(self.checker_initiator_tag)
281
221
self.checker_initiator_tag = None
282
222
self.stop_checker()
294
234
self.checker = None
295
235
if os.WIFEXITED(condition) \
296
236
and (os.WEXITSTATUS(condition) == 0):
297
logger.info(u"Checker for %(name)s succeeded",
298
vars(self))
299
self.last_checked_ok = now
237
logger.debug(u"Checker for %(name)s succeeded",
238
vars(self))
239
self.last_seen = now
300
240
gobject.source_remove(self.stop_initiator_tag)
301
241
self.stop_initiator_tag = gobject.timeout_add\
302
242
(self._timeout_milliseconds,
305
245
logger.warning(u"Checker for %(name)s crashed?",
306
246
vars(self))
307
247
else:
308
logger.info(u"Checker for %(name)s failed",
309
vars(self))
248
logger.debug(u"Checker for %(name)s failed",
249
vars(self))
310
250
def start_checker(self):
311
251
"""Start a new checker subprocess if one is not running.
312
252
If a checker already exists, leave it running and do
321
261
# is as it should be.
322
262
if self.checker is None:
323
263
try:
324
# In case check_command has exactly one % operator
325
command = self.check_command % self.host
264
command = self.check_command % self.fqdn
326
265
except TypeError:
327
# Escape attributes for the shell
328
266
escaped_attrs = dict((key, re.escape(str(val)))
329
267
for key, val in
330
268
vars(self).iteritems())
331
269
try:
332
270
command = self.check_command % escaped_attrs
333
271
except TypeError, error:
334
logger.error(u'Could not format string "%s":'
335
u' %s', self.check_command, error)
272
logger.critical(u'Could not format string "%s":'
273
u' %s', self.check_command, error)
336
274
return True # Try again later
337
275
try:
338
logger.info(u"Starting checker %r for %s",
339
command, self.name)
340
self.checker = subprocess.Popen(command,
341
close_fds=True,
342
shell=True, cwd="/")
276
logger.debug(u"Starting checker %r for %s",
277
command, self.name)
278
self.checker = subprocess.\
279
Popen(command,
280
close_fds=True, shell=True,
281
cwd="/")
343
282
self.checker_callback_tag = gobject.child_watch_add\
344
283
(self.checker.pid,
345
284
self.checker_callback)
353
292
if self.checker_callback_tag:
354
293
gobject.source_remove(self.checker_callback_tag)
355
294
self.checker_callback_tag = None
356
if getattr(self, "checker", None) is None:
295
if not hasattr(self, "checker") or self.checker is None:
357
296
return
358
logger.debug(u"Stopping checker for %(name)s", vars(self))
297
logger.debug("Stopping checker for %(name)s", vars(self))
359
298
try:
360
299
os.kill(self.checker.pid, signal.SIGTERM)
361
300
#os.sleep(0.5)
362
301
#if self.checker.poll() is None:
363
302
# os.kill(self.checker.pid, signal.SIGKILL)
364
303
except OSError, error:
365
if error.errno != errno.ESRCH: # No such process
304
if error.errno != errno.ESRCH:
366
305
raise
367
306
self.checker = None
368
def still_valid(self):
307
def still_valid(self, now=None):
369
308
"""Has the timeout not yet passed for this client?"""
370
now = datetime.datetime.now()
371
if self.last_checked_ok is None:
309
if now is None:
310
now = datetime.datetime.now()
311
if self.last_seen is None:
372
312
return now < (self.created + self.timeout)
373
313
else:
374
return now < (self.last_checked_ok + self.timeout)
314
return now < (self.last_seen + self.timeout)
375
315
376
316
377
317
def peer_certificate(session):
393
333
394
334
def fingerprint(openpgp):
395
335
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
336
# New empty GnuTLS certificate
337
crt = gnutls.library.types.gnutls_openpgp_crt_t()
338
gnutls.library.functions.gnutls_openpgp_crt_init\
339
(ctypes.byref(crt))
396
340
# New GnuTLS "datum" with the OpenPGP public key
397
341
datum = gnutls.library.types.gnutls_datum_t\
398
342
(ctypes.cast(ctypes.c_char_p(openpgp),
399
343
ctypes.POINTER(ctypes.c_ubyte)),
400
344
ctypes.c_uint(len(openpgp)))
401
# New empty GnuTLS certificate
402
crt = gnutls.library.types.gnutls_openpgp_crt_t()
403
gnutls.library.functions.gnutls_openpgp_crt_init\
404
(ctypes.byref(crt))
405
345
# Import the OpenPGP public key into the certificate
406
gnutls.library.functions.gnutls_openpgp_crt_import\
407
(crt, ctypes.byref(datum),
408
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
346
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
347
(crt,
348
ctypes.byref(datum),
349
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
409
350
# New buffer for the fingerprint
410
351
buffer = ctypes.create_string_buffer(20)
411
352
buffer_length = ctypes.c_size_t()
427
368
Note: This will run in its own forked process."""
428
369
429
370
def handle(self):
430
logger.info(u"TCP connection from: %s",
371
logger.debug(u"TCP connection from: %s",
431
372
unicode(self.client_address))
432
session = gnutls.connection.ClientSession\
433
(self.request, gnutls.connection.X509Credentials())
434
435
line = self.request.makefile().readline()
436
logger.debug(u"Protocol version: %r", line)
437
try:
438
if int(line.strip().split()[0]) > 1:
439
raise RuntimeError
440
except (ValueError, IndexError, RuntimeError), error:
441
logger.error(u"Unknown protocol version: %s", error)
442
return
443
444
# Note: gnutls.connection.X509Credentials is really a generic
445
# GnuTLS certificate credentials object so long as no X.509
446
# keys are added to it. Therefore, we can use it here despite
447
# using OpenPGP certificates.
373
session = gnutls.connection.ClientSession(self.request,
374
gnutls.connection.\
375
X509Credentials())
448
376
449
377
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
450
378
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
451
379
# "+DHE-DSS"))
452
priority = "NORMAL" # Fallback default, since this
453
# MUST be set.
454
if self.server.settings["priority"]:
455
priority = self.server.settings["priority"]
380
priority = "SECURE256"
381
456
382
gnutls.library.functions.gnutls_priority_set_direct\
457
383
(session._c_object, priority, None);
458
384
459
385
try:
460
386
session.handshake()
461
387
except gnutls.errors.GNUTLSError, error:
462
logger.warning(u"Handshake failed: %s", error)
388
logger.debug(u"Handshake failed: %s", error)
463
389
# Do not run session.bye() here: the session is not
464
390
# established. Just abandon the request.
465
391
return
466
392
try:
467
393
fpr = fingerprint(peer_certificate(session))
468
394
except (TypeError, gnutls.errors.GNUTLSError), error:
469
logger.warning(u"Bad certificate: %s", error)
395
logger.debug(u"Bad certificate: %s", error)
470
396
session.bye()
471
397
return
472
398
logger.debug(u"Fingerprint: %s", fpr)
475
401
if c.fingerprint == fpr:
476
402
client = c
477
403
break
478
if not client:
479
logger.warning(u"Client not found for fingerprint: %s",
480
fpr)
481
session.bye()
482
return
483
404
# Have to check if client.still_valid(), since it is possible
484
405
# that the client timed out while establishing the GnuTLS
485
406
# session.
486
if not client.still_valid():
487
logger.warning(u"Client %(name)s is invalid",
488
vars(client))
407
if (not client) or (not client.still_valid()):
408
if client:
409
logger.debug(u"Client %(name)s is invalid",
410
vars(client))
411
else:
412
logger.debug(u"Client not found for fingerprint: %s",
413
fpr)
489
414
session.bye()
490
415
return
491
416
sent_size = 0
501
426
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
502
427
"""IPv6 TCP server. Accepts 'None' as address and/or port.
503
428
Attributes:
504
settings: Server settings
429
options: Command line options
505
430
clients: Set() of Client objects
506
431
"""
507
432
address_family = socket.AF_INET6
508
433
def __init__(self, *args, **kwargs):
509
if "settings" in kwargs:
510
self.settings = kwargs["settings"]
511
del kwargs["settings"]
434
if "options" in kwargs:
435
self.options = kwargs["options"]
436
del kwargs["options"]
512
437
if "clients" in kwargs:
513
438
self.clients = kwargs["clients"]
514
439
del kwargs["clients"]
517
442
"""This overrides the normal server_bind() function
518
443
to bind to an interface if one was specified, and also NOT to
519
444
bind to an address or port if they were not specified."""
520
if self.settings["interface"]:
521
# 25 is from /usr/include/asm-i486/socket.h
522
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
445
if self.options.interface:
446
if not hasattr(socket, "SO_BINDTODEVICE"):
447
# From /usr/include/asm-i486/socket.h
448
socket.SO_BINDTODEVICE = 25
523
449
try:
524
450
self.socket.setsockopt(socket.SOL_SOCKET,
525
SO_BINDTODEVICE,
526
self.settings["interface"])
451
socket.SO_BINDTODEVICE,
452
self.options.interface)
527
453
except socket.error, error:
528
454
if error[0] == errno.EPERM:
529
logger.error(u"No permission to"
530
u" bind to interface %s",
531
self.settings["interface"])
455
logger.warning(u"No permission to"
456
u" bind to interface %s",
457
self.options.interface)
532
458
else:
533
459
raise error
534
460
# Only bind(2) the socket if we really need to.
537
463
in6addr_any = "::"
538
464
self.server_address = (in6addr_any,
539
465
self.server_address[1])
540
elif not self.server_address[1]:
466
elif self.server_address[1] is None:
541
467
self.server_address = (self.server_address[0],
542
468
0)
543
# if self.settings["interface"]:
544
# self.server_address = (self.server_address[0],
545
# 0, # port
546
# 0, # flowinfo
547
# if_nametoindex
548
# (self.settings
549
# ["interface"]))
550
469
return super(type(self), self).server_bind()
551
470
552
471
584
503
return delta
585
504
586
505
506
def add_service():
507
"""Derived from the Avahi example code"""
508
global group, serviceName, serviceType, servicePort, serviceTXT, \
509
domain, host
510
if group is None:
511
group = dbus.Interface(
512
bus.get_object( avahi.DBUS_NAME,
513
server.EntryGroupNew()),
514
avahi.DBUS_INTERFACE_ENTRY_GROUP)
515
group.connect_to_signal('StateChanged',
516
entry_group_state_changed)
517
logger.debug(u"Adding service '%s' of type '%s' ...",
518
serviceName, serviceType)
519
520
group.AddService(
521
serviceInterface, # interface
522
avahi.PROTO_INET6, # protocol
523
dbus.UInt32(0), # flags
524
serviceName, serviceType,
525
domain, host,
526
dbus.UInt16(servicePort),
527
avahi.string_array_to_txt_array(serviceTXT))
528
group.Commit()
529
530
531
def remove_service():
532
"""From the Avahi example code"""
533
global group
534
535
if not group is None:
536
group.Reset()
537
538
587
539
def server_state_changed(state):
588
540
"""Derived from the Avahi example code"""
589
541
if state == avahi.SERVER_COLLISION:
590
logger.error(u"Server name collision")
591
service.remove()
542
logger.warning(u"Server name collision")
543
remove_service()
592
544
elif state == avahi.SERVER_RUNNING:
593
service.add()
545
add_service()
594
546
595
547
596
548
def entry_group_state_changed(state, error):
597
549
"""Derived from the Avahi example code"""
550
global serviceName, server, rename_count
551
598
552
logger.debug(u"state change: %i", state)
599
553
600
554
if state == avahi.ENTRY_GROUP_ESTABLISHED:
601
555
logger.debug(u"Service established.")
602
556
elif state == avahi.ENTRY_GROUP_COLLISION:
603
logger.warning(u"Service name collision.")
604
service.rename()
557
558
rename_count = rename_count - 1
559
if rename_count > 0:
560
name = server.GetAlternativeServiceName(name)
561
logger.warning(u"Service name collision, "
562
u"changing name to '%s' ...", name)
563
remove_service()
564
add_service()
565
566
else:
567
logger.error(u"No suitable service name found after %i"
568
u" retries, exiting.", n_rename)
569
killme(1)
605
570
elif state == avahi.ENTRY_GROUP_FAILURE:
606
logger.critical(u"Error in group state changed %s",
607
unicode(error))
608
raise AvahiGroupError("State changed: %s", str(error))
571
logger.error(u"Error in group state changed %s",
572
unicode(error))
573
killme(1)
574
609
575
610
576
def if_nametoindex(interface):
611
"""Call the C function if_nametoindex(), or equivalent"""
612
global if_nametoindex
577
"""Call the C function if_nametoindex()"""
613
578
try:
614
if "ctypes.util" not in sys.modules:
615
import ctypes.util
616
if_nametoindex = ctypes.cdll.LoadLibrary\
617
(ctypes.util.find_library("c")).if_nametoindex
579
libc = ctypes.cdll.LoadLibrary("libc.so.6")
580
return libc.if_nametoindex(interface)
618
581
except (OSError, AttributeError):
619
582
if "struct" not in sys.modules:
620
583
import struct
621
584
if "fcntl" not in sys.modules:
622
585
import fcntl
623
def if_nametoindex(interface):
624
"Get an interface index the hard way, i.e. using fcntl()"
625
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
626
s = socket.socket()
627
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
628
struct.pack("16s16x", interface))
629
s.close()
630
interface_index = struct.unpack("I", ifreq[16:20])[0]
631
return interface_index
632
return if_nametoindex(interface)
633
634
635
def daemon(nochdir = False, noclose = False):
586
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
587
s = socket.socket()
588
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
589
struct.pack("16s16x", interface))
590
s.close()
591
interface_index = struct.unpack("I", ifreq[16:20])[0]
592
return interface_index
593
594
595
def daemon(nochdir, noclose):
636
596
"""See daemon(3). Standard BSD Unix function.
637
597
This should really exist as os.daemon, but it doesn't (yet)."""
638
598
if os.fork():
640
600
os.setsid()
641
601
if not nochdir:
642
602
os.chdir("/")
643
if os.fork():
644
sys.exit()
645
603
if not noclose:
646
604
# Close all standard open file descriptors
647
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
605
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
648
606
if not stat.S_ISCHR(os.fstat(null).st_mode):
649
607
raise OSError(errno.ENODEV,
650
608
"/dev/null not a character device")
655
613
os.close(null)
656
614
657
615
616
def killme(status = 0):
617
logger.debug("Stopping server with exit status %d", status)
618
exitstatus = status
619
if main_loop_started:
620
main_loop.quit()
621
else:
622
sys.exit(status)
623
624
658
625
def main():
626
global exitstatus
627
exitstatus = 0
659
628
global main_loop_started
660
629
main_loop_started = False
661
630
662
parser = OptionParser(version = "%%prog %s" % version)
631
parser = OptionParser()
663
632
parser.add_option("-i", "--interface", type="string",
664
metavar="IF", help="Bind to interface IF")
665
parser.add_option("-a", "--address", type="string",
633
default=None, metavar="IF",
634
help="Bind to interface IF")
635
parser.add_option("-a", "--address", type="string", default=None,
666
636
help="Address to listen for requests on")
667
parser.add_option("-p", "--port", type="int",
637
parser.add_option("-p", "--port", type="int", default=None,
668
638
help="Port number to receive requests on")
639
parser.add_option("--timeout", type="string", # Parsed later
640
default="1h",
641
help="Amount of downtime allowed for clients")
642
parser.add_option("--interval", type="string", # Parsed later
643
default="5m",
644
help="How often to check that a client is up")
669
645
parser.add_option("--check", action="store_true", default=False,
670
646
help="Run self-test")
671
parser.add_option("--debug", action="store_true",
672
help="Debug mode; run in foreground and log to"
673
" terminal")
674
parser.add_option("--priority", type="string", help="GnuTLS"
675
" priority string (see GnuTLS documentation)")
676
parser.add_option("--servicename", type="string", metavar="NAME",
677
help="Zeroconf service name")
678
parser.add_option("--configdir", type="string",
679
default="/etc/mandos", metavar="DIR",
680
help="Directory to search for configuration"
681
" files")
647
parser.add_option("--debug", action="store_true", default=False,
648
help="Debug mode")
682
649
(options, args) = parser.parse_args()
683
650
684
651
if options.check:
686
653
doctest.testmod()
687
654
sys.exit()
688
655
689
# Default values for config file for server-global settings
690
server_defaults = { "interface": "",
691
"address": "",
692
"port": "",
693
"debug": "False",
694
"priority":
695
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
696
"servicename": "Mandos",
697
}
698
699
# Parse config file for server-global settings
700
server_config = ConfigParser.SafeConfigParser(server_defaults)
701
del server_defaults
702
server_config.read(os.path.join(options.configdir, "mandos.conf"))
703
server_section = "server"
704
# Convert the SafeConfigParser object to a dict
705
server_settings = dict(server_config.items(server_section))
706
# Use getboolean on the boolean config option
707
server_settings["debug"] = server_config.getboolean\
708
(server_section, "debug")
709
del server_config
710
711
# Override the settings from the config file with command line
712
# options, if set.
713
for option in ("interface", "address", "port", "debug",
714
"priority", "servicename", "configdir"):
715
value = getattr(options, option)
716
if value is not None:
717
server_settings[option] = value
718
del options
719
# Now we have our good server settings in "server_settings"
720
721
debug = server_settings["debug"]
722
723
if not debug:
724
syslogger.setLevel(logging.WARNING)
725
console.setLevel(logging.WARNING)
726
727
if server_settings["servicename"] != "Mandos":
728
syslogger.setFormatter(logging.Formatter\
729
('Mandos (%s): %%(levelname)s:'
730
' %%(message)s'
731
% server_settings["servicename"]))
732
733
# Parse config file with clients
734
client_defaults = { "timeout": "1h",
735
"interval": "5m",
736
"checker": "fping -q -- %%(host)s",
737
}
738
client_config = ConfigParser.SafeConfigParser(client_defaults)
739
client_config.read(os.path.join(server_settings["configdir"],
740
"clients.conf"))
741
742
global service
743
service = AvahiService(name = server_settings["servicename"],
744
type = "_mandos._tcp", );
745
if server_settings["interface"]:
746
service.interface = if_nametoindex(server_settings["interface"])
656
# Parse the time arguments
657
try:
658
options.timeout = string_to_delta(options.timeout)
659
except ValueError:
660
parser.error("option --timeout: Unparseable time")
661
try:
662
options.interval = string_to_delta(options.interval)
663
except ValueError:
664
parser.error("option --interval: Unparseable time")
665
666
# Parse config file
667
defaults = { "checker": "fping -q -- %%(fqdn)s" }
668
client_config = ConfigParser.SafeConfigParser(defaults)
669
#client_config.readfp(open("global.conf"), "global.conf")
670
client_config.read("mandos-clients.conf")
747
671
748
672
global main_loop
749
673
global bus
757
681
avahi.DBUS_INTERFACE_SERVER )
758
682
# End of Avahi example code
759
683
684
debug = options.debug
685
686
if debug:
687
console = logging.StreamHandler()
688
# console.setLevel(logging.DEBUG)
689
console.setFormatter(logging.Formatter\
690
('%(levelname)s: %(message)s'))
691
logger.addHandler(console)
692
del console
693
760
694
clients = Set()
761
695
def remove_from_clients(client):
762
696
clients.remove(client)
763
697
if not clients:
764
logger.critical(u"No clients left, exiting")
765
sys.exit()
698
logger.debug(u"No clients left, exiting")
699
killme()
766
700
767
clients.update(Set(Client(name = section,
701
clients.update(Set(Client(name=section, options=options,
768
702
stop_hook = remove_from_clients,
769
config
770
= dict(client_config.items(section)))
703
**(dict(client_config\
704
.items(section))))
771
705
for section in client_config.sections()))
772
if not clients:
773
logger.critical(u"No clients defined")
774
sys.exit(1)
775
706
776
707
if not debug:
777
logger.removeHandler(console)
778
daemon()
779
780
pidfilename = "/var/run/mandos/mandos.pid"
781
pid = os.getpid()
782
try:
783
pidfile = open(pidfilename, "w")
784
pidfile.write(str(pid) + "\n")
785
pidfile.close()
786
del pidfile
787
except IOError, err:
788
logger.error(u"Could not write %s file with PID %d",
789
pidfilename, os.getpid())
708
daemon(False, False)
790
709
791
710
def cleanup():
792
711
"Cleanup function; run on exit"
806
725
807
726
if not debug:
808
727
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())
728
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
729
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
811
730
812
731
for client in clients:
813
732
client.start()
814
733
815
tcp_server = IPv6_TCPServer((server_settings["address"],
816
server_settings["port"]),
734
tcp_server = IPv6_TCPServer((options.address, options.port),
817
735
tcp_handler,
818
settings=server_settings,
736
options=options,
819
737
clients=clients)
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
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")
738
# Find out what random port we got
739
global servicePort
740
servicePort = tcp_server.socket.getsockname()[1]
741
logger.debug(u"Now listening on port %d", servicePort)
742
743
if options.interface is not None:
744
global serviceInterface
745
serviceInterface = if_nametoindex(options.interface)
746
747
# From the Avahi example code
748
server.connect_to_signal("StateChanged", server_state_changed)
749
try:
750
server_state_changed(server.GetState())
751
except dbus.exceptions.DBusException, error:
752
logger.critical(u"DBusException: %s", error)
753
killme(1)
754
# End of Avahi example code
755
756
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
757
lambda *args, **kwargs:
758
tcp_server.handle_request(*args[2:],
759
**kwargs) or True)
760
try:
761
logger.debug("Starting main loop")
843
762
main_loop_started = True
844
763
main_loop.run()
845
except AvahiError, error:
846
logger.critical(u"AvahiError: %s" + unicode(error))
847
sys.exit(1)
848
764
except KeyboardInterrupt:
849
765
if debug:
850
766
print
767
768
sys.exit(exitstatus)
851
769
852
770
if __name__ == '__main__':
853
771
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0