To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to mandos
- browse files at revision 24.1.53
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.53
- Committer: Björn Påhlsson
- Date: 2008-08-16 17:11:35 UTC
- mfrom: (79 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816171135-w1v8mrtsxs0ghfa6
merge
- files added:
- COPYING
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.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
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
# following functions: "add_service", "remove_service",
10
# "server_state_changed", "entry_group_state_changed", and some lines
11
# in "main".
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
12
#
13
# Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
14
# Påhlsson.
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn 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 <https://www.fukt.bsnet.se/~belorn/> and
30
# <https://www.fukt.bsnet.se/~teddy/>.
29
# Contact the authors at <mandos@fukt.bsnet.se>.
31
30
#
32
31
33
32
from __future__ import division
62
61
from dbus.mainloop.glib import DBusGMainLoop
63
62
import ctypes
64
63
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
64
version = "1.0"
76
65
77
66
logger = logging.Logger('mandos')
78
67
syslogger = logging.handlers.SysLogHandler\
79
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
68
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
address = "/dev/log")
80
70
syslogger.setFormatter(logging.Formatter\
81
('%(levelname)s: %(message)s'))
71
('Mandos: %(levelname)s: %(message)s'))
82
72
logger.addHandler(syslogger)
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
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
89
163
# From the Avahi example code:
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
164
group = None # our entry group
99
165
# End of Avahi example code
100
166
101
167
106
172
fingerprint: string (40 or 32 hexadecimal digits); used to
107
173
uniquely identify the client
108
174
secret: bytestring; sent verbatim (over TLS) to client
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
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
114
180
interval: datetime.timedelta(); How often to start a new checker
115
181
stop_hook: If set, called by stop() as stop_hook(self)
116
182
checker: subprocess.Popen(); a running checker process used
117
183
to see if the client lives.
118
Is None if no process is running.
184
'None' if no process is running.
119
185
checker_initiator_tag: a gobject event source tag, or None
120
186
stop_initiator_tag: - '' -
121
187
checker_callback_tag: - '' -
122
188
checker_command: string; External command which is run to check if
123
client lives. %()s expansions are done at
189
client lives. %() expansions are done at
124
190
runtime with vars(self) as dict, so that for
125
191
instance %(name)s can be used in the command.
126
192
Private attibutes:
127
193
_timeout: Real variable for 'timeout'
128
194
_interval: Real variable for 'interval'
129
_timeout_milliseconds: Used by gobject.timeout_add()
195
_timeout_milliseconds: Used when calling gobject.timeout_add()
130
196
_interval_milliseconds: - '' -
131
197
"""
132
198
def _set_timeout(self, timeout):
152
218
interval = property(lambda self: self._interval,
153
219
_set_interval)
154
220
del _set_interval
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.."""
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."""
160
225
self.name = name
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)
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"])
169
237
self.secret = sf.read()
170
238
sf.close()
171
239
else:
172
raise RuntimeError(u"No secret or secfile for client %s"
173
% self.name)
174
self.fqdn = fqdn # string
240
raise TypeError(u"No secret or secfile for client %s"
241
% self.name)
242
self.host = config.get("host", "")
175
243
self.created = datetime.datetime.now()
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)
244
self.last_checked_ok = None
245
self.timeout = string_to_delta(config["timeout"])
246
self.interval = string_to_delta(config["interval"])
185
247
self.stop_hook = stop_hook
186
248
self.checker = None
187
249
self.checker_initiator_tag = None
188
250
self.stop_initiator_tag = None
189
251
self.checker_callback_tag = None
190
self.check_command = checker
252
self.check_command = config["checker"]
191
253
def start(self):
192
254
"""Start this client's checker and timeout hooks"""
193
255
# Schedule a new checker to be started an 'interval' from now,
203
265
self.stop)
204
266
def stop(self):
205
267
"""Stop this client.
206
The possibility that this client might be restarted is left
207
open, but not currently used."""
268
The possibility that a client might be restarted is left open,
269
but not currently used."""
208
270
# If this client doesn't have a secret, it is already stopped.
209
if self.secret:
210
logger.debug(u"Stopping client %s", self.name)
271
if hasattr(self, "secret") and self.secret:
272
logger.info(u"Stopping client %s", self.name)
211
273
self.secret = None
212
274
else:
213
275
return False
214
if hasattr(self, "stop_initiator_tag") \
215
and self.stop_initiator_tag:
276
if getattr(self, "stop_initiator_tag", False):
216
277
gobject.source_remove(self.stop_initiator_tag)
217
278
self.stop_initiator_tag = None
218
if hasattr(self, "checker_initiator_tag") \
219
and self.checker_initiator_tag:
279
if getattr(self, "checker_initiator_tag", False):
220
280
gobject.source_remove(self.checker_initiator_tag)
221
281
self.checker_initiator_tag = None
222
282
self.stop_checker()
234
294
self.checker = None
235
295
if os.WIFEXITED(condition) \
236
296
and (os.WEXITSTATUS(condition) == 0):
237
logger.debug(u"Checker for %(name)s succeeded",
238
vars(self))
239
self.last_seen = now
297
logger.info(u"Checker for %(name)s succeeded",
298
vars(self))
299
self.last_checked_ok = now
240
300
gobject.source_remove(self.stop_initiator_tag)
241
301
self.stop_initiator_tag = gobject.timeout_add\
242
302
(self._timeout_milliseconds,
245
305
logger.warning(u"Checker for %(name)s crashed?",
246
306
vars(self))
247
307
else:
248
logger.debug(u"Checker for %(name)s failed",
249
vars(self))
308
logger.info(u"Checker for %(name)s failed",
309
vars(self))
250
310
def start_checker(self):
251
311
"""Start a new checker subprocess if one is not running.
252
312
If a checker already exists, leave it running and do
261
321
# is as it should be.
262
322
if self.checker is None:
263
323
try:
264
command = self.check_command % self.fqdn
324
# In case check_command has exactly one % operator
325
command = self.check_command % self.host
265
326
except TypeError:
327
# Escape attributes for the shell
266
328
escaped_attrs = dict((key, re.escape(str(val)))
267
329
for key, val in
268
330
vars(self).iteritems())
269
331
try:
270
332
command = self.check_command % escaped_attrs
271
333
except TypeError, error:
272
logger.critical(u'Could not format string "%s":'
273
u' %s', self.check_command, error)
334
logger.error(u'Could not format string "%s":'
335
u' %s', self.check_command, error)
274
336
return True # Try again later
275
337
try:
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="/")
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="/")
282
343
self.checker_callback_tag = gobject.child_watch_add\
283
344
(self.checker.pid,
284
345
self.checker_callback)
292
353
if self.checker_callback_tag:
293
354
gobject.source_remove(self.checker_callback_tag)
294
355
self.checker_callback_tag = None
295
if not hasattr(self, "checker") or self.checker is None:
356
if getattr(self, "checker", None) is None:
296
357
return
297
logger.debug("Stopping checker for %(name)s", vars(self))
358
logger.debug(u"Stopping checker for %(name)s", vars(self))
298
359
try:
299
360
os.kill(self.checker.pid, signal.SIGTERM)
300
361
#os.sleep(0.5)
301
362
#if self.checker.poll() is None:
302
363
# os.kill(self.checker.pid, signal.SIGKILL)
303
364
except OSError, error:
304
if error.errno != errno.ESRCH:
365
if error.errno != errno.ESRCH: # No such process
305
366
raise
306
367
self.checker = None
307
def still_valid(self, now=None):
368
def still_valid(self):
308
369
"""Has the timeout not yet passed for this client?"""
309
if now is None:
310
now = datetime.datetime.now()
311
if self.last_seen is None:
370
now = datetime.datetime.now()
371
if self.last_checked_ok is None:
312
372
return now < (self.created + self.timeout)
313
373
else:
314
return now < (self.last_seen + self.timeout)
374
return now < (self.last_checked_ok + self.timeout)
315
375
316
376
317
377
def peer_certificate(session):
333
393
334
394
def fingerprint(openpgp):
335
395
"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))
340
396
# New GnuTLS "datum" with the OpenPGP public key
341
397
datum = gnutls.library.types.gnutls_datum_t\
342
398
(ctypes.cast(ctypes.c_char_p(openpgp),
343
399
ctypes.POINTER(ctypes.c_ubyte)),
344
400
ctypes.c_uint(len(openpgp)))
401
# New empty GnuTLS certificate
402
crt = gnutls.library.types.gnutls_openpgp_crt_t()
403
gnutls.library.functions.gnutls_openpgp_crt_init\
404
(ctypes.byref(crt))
345
405
# Import the OpenPGP public key into the certificate
346
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
347
(crt,
348
ctypes.byref(datum),
349
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
406
gnutls.library.functions.gnutls_openpgp_crt_import\
407
(crt, ctypes.byref(datum),
408
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
350
409
# New buffer for the fingerprint
351
410
buffer = ctypes.create_string_buffer(20)
352
411
buffer_length = ctypes.c_size_t()
368
427
Note: This will run in its own forked process."""
369
428
370
429
def handle(self):
371
logger.debug(u"TCP connection from: %s",
430
logger.info(u"TCP connection from: %s",
372
431
unicode(self.client_address))
373
session = gnutls.connection.ClientSession(self.request,
374
gnutls.connection.\
375
X509Credentials())
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.
376
448
377
449
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
378
450
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
379
451
# "+DHE-DSS"))
380
priority = "SECURE256"
381
452
priority = "NORMAL" # Fallback default, since this
453
# MUST be set.
454
if self.server.settings["priority"]:
455
priority = self.server.settings["priority"]
382
456
gnutls.library.functions.gnutls_priority_set_direct\
383
457
(session._c_object, priority, None);
384
458
385
459
try:
386
460
session.handshake()
387
461
except gnutls.errors.GNUTLSError, error:
388
logger.debug(u"Handshake failed: %s", error)
462
logger.warning(u"Handshake failed: %s", error)
389
463
# Do not run session.bye() here: the session is not
390
464
# established. Just abandon the request.
391
465
return
392
466
try:
393
467
fpr = fingerprint(peer_certificate(session))
394
468
except (TypeError, gnutls.errors.GNUTLSError), error:
395
logger.debug(u"Bad certificate: %s", error)
469
logger.warning(u"Bad certificate: %s", error)
396
470
session.bye()
397
471
return
398
472
logger.debug(u"Fingerprint: %s", fpr)
401
475
if c.fingerprint == fpr:
402
476
client = c
403
477
break
478
if not client:
479
logger.warning(u"Client not found for fingerprint: %s",
480
fpr)
481
session.bye()
482
return
404
483
# Have to check if client.still_valid(), since it is possible
405
484
# that the client timed out while establishing the GnuTLS
406
485
# session.
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)
486
if not client.still_valid():
487
logger.warning(u"Client %(name)s is invalid",
488
vars(client))
414
489
session.bye()
415
490
return
416
491
sent_size = 0
426
501
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
427
502
"""IPv6 TCP server. Accepts 'None' as address and/or port.
428
503
Attributes:
429
options: Command line options
504
settings: Server settings
430
505
clients: Set() of Client objects
431
506
"""
432
507
address_family = socket.AF_INET6
433
508
def __init__(self, *args, **kwargs):
434
if "options" in kwargs:
435
self.options = kwargs["options"]
436
del kwargs["options"]
509
if "settings" in kwargs:
510
self.settings = kwargs["settings"]
511
del kwargs["settings"]
437
512
if "clients" in kwargs:
438
513
self.clients = kwargs["clients"]
439
514
del kwargs["clients"]
442
517
"""This overrides the normal server_bind() function
443
518
to bind to an interface if one was specified, and also NOT to
444
519
bind to an address or port if they were not specified."""
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
520
if self.settings["interface"]:
521
# 25 is from /usr/include/asm-i486/socket.h
522
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
449
523
try:
450
524
self.socket.setsockopt(socket.SOL_SOCKET,
451
socket.SO_BINDTODEVICE,
452
self.options.interface)
525
SO_BINDTODEVICE,
526
self.settings["interface"])
453
527
except socket.error, error:
454
528
if error[0] == errno.EPERM:
455
logger.warning(u"No permission to"
456
u" bind to interface %s",
457
self.options.interface)
529
logger.error(u"No permission to"
530
u" bind to interface %s",
531
self.settings["interface"])
458
532
else:
459
533
raise error
460
534
# Only bind(2) the socket if we really need to.
463
537
in6addr_any = "::"
464
538
self.server_address = (in6addr_any,
465
539
self.server_address[1])
466
elif self.server_address[1] is None:
540
elif not self.server_address[1]:
467
541
self.server_address = (self.server_address[0],
468
542
0)
543
# if self.settings["interface"]:
544
# self.server_address = (self.server_address[0],
545
# 0, # port
546
# 0, # flowinfo
547
# if_nametoindex
548
# (self.settings
549
# ["interface"]))
469
550
return super(type(self), self).server_bind()
470
551
471
552
503
584
return delta
504
585
505
586
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
539
587
def server_state_changed(state):
540
588
"""Derived from the Avahi example code"""
541
589
if state == avahi.SERVER_COLLISION:
542
logger.warning(u"Server name collision")
543
remove_service()
590
logger.error(u"Server name collision")
591
service.remove()
544
592
elif state == avahi.SERVER_RUNNING:
545
add_service()
593
service.add()
546
594
547
595
548
596
def entry_group_state_changed(state, error):
549
597
"""Derived from the Avahi example code"""
550
global serviceName, server, rename_count
551
552
598
logger.debug(u"state change: %i", state)
553
599
554
600
if state == avahi.ENTRY_GROUP_ESTABLISHED:
555
601
logger.debug(u"Service established.")
556
602
elif state == avahi.ENTRY_GROUP_COLLISION:
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)
603
logger.warning(u"Service name collision.")
604
service.rename()
570
605
elif state == avahi.ENTRY_GROUP_FAILURE:
571
logger.error(u"Error in group state changed %s",
572
unicode(error))
573
killme(1)
574
606
logger.critical(u"Error in group state changed %s",
607
unicode(error))
608
raise AvahiGroupError("State changed: %s", str(error))
575
609
576
610
def if_nametoindex(interface):
577
"""Call the C function if_nametoindex()"""
611
"""Call the C function if_nametoindex(), or equivalent"""
612
global if_nametoindex
578
613
try:
579
libc = ctypes.cdll.LoadLibrary("libc.so.6")
580
return libc.if_nametoindex(interface)
614
if "ctypes.util" not in sys.modules:
615
import ctypes.util
616
if_nametoindex = ctypes.cdll.LoadLibrary\
617
(ctypes.util.find_library("c")).if_nametoindex
581
618
except (OSError, AttributeError):
582
619
if "struct" not in sys.modules:
583
620
import struct
584
621
if "fcntl" not in sys.modules:
585
622
import fcntl
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):
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):
596
636
"""See daemon(3). Standard BSD Unix function.
597
637
This should really exist as os.daemon, but it doesn't (yet)."""
598
638
if os.fork():
600
640
os.setsid()
601
641
if not nochdir:
602
642
os.chdir("/")
643
if os.fork():
644
sys.exit()
603
645
if not noclose:
604
646
# Close all standard open file descriptors
605
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
647
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
606
648
if not stat.S_ISCHR(os.fstat(null).st_mode):
607
649
raise OSError(errno.ENODEV,
608
650
"/dev/null not a character device")
613
655
os.close(null)
614
656
615
657
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
625
658
def main():
626
global exitstatus
627
exitstatus = 0
628
659
global main_loop_started
629
660
main_loop_started = False
630
661
631
parser = OptionParser()
662
parser = OptionParser(version = "%%prog %s" % version)
632
663
parser.add_option("-i", "--interface", type="string",
633
default=None, metavar="IF",
634
help="Bind to interface IF")
635
parser.add_option("-a", "--address", type="string", default=None,
664
metavar="IF", help="Bind to interface IF")
665
parser.add_option("-a", "--address", type="string",
636
666
help="Address to listen for requests on")
637
parser.add_option("-p", "--port", type="int", default=None,
667
parser.add_option("-p", "--port", type="int",
638
668
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")
645
669
parser.add_option("--check", action="store_true", default=False,
646
670
help="Run self-test")
647
parser.add_option("--debug", action="store_true", default=False,
648
help="Debug mode")
671
parser.add_option("--debug", action="store_true",
672
help="Debug mode; run in foreground and log to"
673
" terminal")
674
parser.add_option("--priority", type="string", help="GnuTLS"
675
" priority string (see GnuTLS documentation)")
676
parser.add_option("--servicename", type="string", metavar="NAME",
677
help="Zeroconf service name")
678
parser.add_option("--configdir", type="string",
679
default="/etc/mandos", metavar="DIR",
680
help="Directory to search for configuration"
681
" files")
649
682
(options, args) = parser.parse_args()
650
683
651
684
if options.check:
653
686
doctest.testmod()
654
687
sys.exit()
655
688
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")
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"])
671
747
672
748
global main_loop
673
749
global bus
681
757
avahi.DBUS_INTERFACE_SERVER )
682
758
# End of Avahi example code
683
759
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
694
760
clients = Set()
695
761
def remove_from_clients(client):
696
762
clients.remove(client)
697
763
if not clients:
698
logger.debug(u"No clients left, exiting")
699
killme()
764
logger.critical(u"No clients left, exiting")
765
sys.exit()
700
766
701
clients.update(Set(Client(name=section, options=options,
767
clients.update(Set(Client(name = section,
702
768
stop_hook = remove_from_clients,
703
**(dict(client_config\
704
.items(section))))
769
config
770
= dict(client_config.items(section)))
705
771
for section in client_config.sections()))
772
if not clients:
773
logger.critical(u"No clients defined")
774
sys.exit(1)
706
775
707
776
if not debug:
708
daemon(False, False)
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())
709
790
710
791
def cleanup():
711
792
"Cleanup function; run on exit"
725
806
726
807
if not debug:
727
808
signal.signal(signal.SIGINT, signal.SIG_IGN)
728
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
729
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
809
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
810
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
730
811
731
812
for client in clients:
732
813
client.start()
733
814
734
tcp_server = IPv6_TCPServer((options.address, options.port),
815
tcp_server = IPv6_TCPServer((server_settings["address"],
816
server_settings["port"]),
735
817
tcp_handler,
736
options=options,
818
settings=server_settings,
737
819
clients=clients)
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")
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")
762
843
main_loop_started = True
763
844
main_loop.run()
845
except AvahiError, error:
846
logger.critical(u"AvahiError: %s" + unicode(error))
847
sys.exit(1)
764
848
except KeyboardInterrupt:
765
849
if debug:
766
850
print
767
768
sys.exit(exitstatus)
769
851
770
852
if __name__ == '__main__':
771
853
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0