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- Committer: Teddy Hogeborn
- Date: 2008-07-22 01:59:47 UTC
- Revision ID: teddy@fukt.bsnet.se-20080722015947-y7o6keji020nvrhw
* Makefile (OPTIMIZE): New; optimize for size.
(CFLAGS): Use $(OPTIMIZE).
(CFLAGS): Use $(OPTIMIZE).
- 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
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# 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
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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
# We don't need to redirect stdout and stderr, since
341
# in normal mode, that is already done by daemon(),
342
# and in debug mode we don't want to. (Stdin is
343
# always replaced by /dev/null.)
344
self.checker = subprocess.Popen(command,
345
close_fds=True,
346
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="/")
347
282
self.checker_callback_tag = gobject.child_watch_add\
348
283
(self.checker.pid,
349
284
self.checker_callback)
350
except OSError, error:
285
except subprocess.OSError, error:
351
286
logger.error(u"Failed to start subprocess: %s",
352
287
error)
353
288
# Re-run this periodically if run by gobject.timeout_add
357
292
if self.checker_callback_tag:
358
293
gobject.source_remove(self.checker_callback_tag)
359
294
self.checker_callback_tag = None
360
if getattr(self, "checker", None) is None:
295
if not hasattr(self, "checker") or self.checker is None:
361
296
return
362
logger.debug(u"Stopping checker for %(name)s", vars(self))
297
logger.debug("Stopping checker for %(name)s", vars(self))
363
298
try:
364
299
os.kill(self.checker.pid, signal.SIGTERM)
365
300
#os.sleep(0.5)
366
301
#if self.checker.poll() is None:
367
302
# os.kill(self.checker.pid, signal.SIGKILL)
368
303
except OSError, error:
369
if error.errno != errno.ESRCH: # No such process
304
if error.errno != errno.ESRCH:
370
305
raise
371
306
self.checker = None
372
def still_valid(self):
307
def still_valid(self, now=None):
373
308
"""Has the timeout not yet passed for this client?"""
374
now = datetime.datetime.now()
375
if self.last_checked_ok is None:
309
if now is None:
310
now = datetime.datetime.now()
311
if self.last_seen is None:
376
312
return now < (self.created + self.timeout)
377
313
else:
378
return now < (self.last_checked_ok + self.timeout)
314
return now < (self.last_seen + self.timeout)
379
315
380
316
381
317
def peer_certificate(session):
397
333
398
334
def fingerprint(openpgp):
399
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))
400
340
# New GnuTLS "datum" with the OpenPGP public key
401
341
datum = gnutls.library.types.gnutls_datum_t\
402
342
(ctypes.cast(ctypes.c_char_p(openpgp),
403
343
ctypes.POINTER(ctypes.c_ubyte)),
404
344
ctypes.c_uint(len(openpgp)))
405
# New empty GnuTLS certificate
406
crt = gnutls.library.types.gnutls_openpgp_crt_t()
407
gnutls.library.functions.gnutls_openpgp_crt_init\
408
(ctypes.byref(crt))
409
345
# Import the OpenPGP public key into the certificate
410
gnutls.library.functions.gnutls_openpgp_crt_import\
411
(crt, ctypes.byref(datum),
412
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)
413
350
# New buffer for the fingerprint
414
351
buffer = ctypes.create_string_buffer(20)
415
352
buffer_length = ctypes.c_size_t()
431
368
Note: This will run in its own forked process."""
432
369
433
370
def handle(self):
434
logger.info(u"TCP connection from: %s",
371
logger.debug(u"TCP connection from: %s",
435
372
unicode(self.client_address))
436
session = gnutls.connection.ClientSession\
437
(self.request, gnutls.connection.X509Credentials())
438
439
line = self.request.makefile().readline()
440
logger.debug(u"Protocol version: %r", line)
441
try:
442
if int(line.strip().split()[0]) > 1:
443
raise RuntimeError
444
except (ValueError, IndexError, RuntimeError), error:
445
logger.error(u"Unknown protocol version: %s", error)
446
return
447
448
# Note: gnutls.connection.X509Credentials is really a generic
449
# GnuTLS certificate credentials object so long as no X.509
450
# keys are added to it. Therefore, we can use it here despite
451
# using OpenPGP certificates.
373
session = gnutls.connection.ClientSession(self.request,
374
gnutls.connection.\
375
X509Credentials())
452
376
453
377
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
454
378
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
455
379
# "+DHE-DSS"))
456
priority = "NORMAL" # Fallback default, since this
457
# MUST be set.
458
if self.server.settings["priority"]:
459
priority = self.server.settings["priority"]
380
priority = "SECURE256"
381
460
382
gnutls.library.functions.gnutls_priority_set_direct\
461
383
(session._c_object, priority, None);
462
384
463
385
try:
464
386
session.handshake()
465
387
except gnutls.errors.GNUTLSError, error:
466
logger.warning(u"Handshake failed: %s", error)
388
logger.debug(u"Handshake failed: %s", error)
467
389
# Do not run session.bye() here: the session is not
468
390
# established. Just abandon the request.
469
391
return
470
392
try:
471
393
fpr = fingerprint(peer_certificate(session))
472
394
except (TypeError, gnutls.errors.GNUTLSError), error:
473
logger.warning(u"Bad certificate: %s", error)
395
logger.debug(u"Bad certificate: %s", error)
474
396
session.bye()
475
397
return
476
398
logger.debug(u"Fingerprint: %s", fpr)
479
401
if c.fingerprint == fpr:
480
402
client = c
481
403
break
482
if not client:
483
logger.warning(u"Client not found for fingerprint: %s",
484
fpr)
485
session.bye()
486
return
487
404
# Have to check if client.still_valid(), since it is possible
488
405
# that the client timed out while establishing the GnuTLS
489
406
# session.
490
if not client.still_valid():
491
logger.warning(u"Client %(name)s is invalid",
492
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)
493
414
session.bye()
494
415
return
495
416
sent_size = 0
505
426
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
506
427
"""IPv6 TCP server. Accepts 'None' as address and/or port.
507
428
Attributes:
508
settings: Server settings
429
options: Command line options
509
430
clients: Set() of Client objects
510
431
"""
511
432
address_family = socket.AF_INET6
512
433
def __init__(self, *args, **kwargs):
513
if "settings" in kwargs:
514
self.settings = kwargs["settings"]
515
del kwargs["settings"]
434
if "options" in kwargs:
435
self.options = kwargs["options"]
436
del kwargs["options"]
516
437
if "clients" in kwargs:
517
438
self.clients = kwargs["clients"]
518
439
del kwargs["clients"]
521
442
"""This overrides the normal server_bind() function
522
443
to bind to an interface if one was specified, and also NOT to
523
444
bind to an address or port if they were not specified."""
524
if self.settings["interface"]:
525
# 25 is from /usr/include/asm-i486/socket.h
526
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
527
449
try:
528
450
self.socket.setsockopt(socket.SOL_SOCKET,
529
SO_BINDTODEVICE,
530
self.settings["interface"])
451
socket.SO_BINDTODEVICE,
452
self.options.interface)
531
453
except socket.error, error:
532
454
if error[0] == errno.EPERM:
533
logger.error(u"No permission to"
534
u" bind to interface %s",
535
self.settings["interface"])
455
logger.warning(u"No permission to"
456
u" bind to interface %s",
457
self.options.interface)
536
458
else:
537
459
raise error
538
460
# Only bind(2) the socket if we really need to.
541
463
in6addr_any = "::"
542
464
self.server_address = (in6addr_any,
543
465
self.server_address[1])
544
elif not self.server_address[1]:
466
elif self.server_address[1] is None:
545
467
self.server_address = (self.server_address[0],
546
468
0)
547
# if self.settings["interface"]:
548
# self.server_address = (self.server_address[0],
549
# 0, # port
550
# 0, # flowinfo
551
# if_nametoindex
552
# (self.settings
553
# ["interface"]))
554
469
return super(type(self), self).server_bind()
555
470
556
471
567
482
datetime.timedelta(1)
568
483
>>> string_to_delta(u'1w')
569
484
datetime.timedelta(7)
570
>>> string_to_delta('5m 30s')
571
datetime.timedelta(0, 330)
572
485
"""
573
timevalue = datetime.timedelta(0)
574
for s in interval.split():
575
try:
576
suffix=unicode(s[-1])
577
value=int(s[:-1])
578
if suffix == u"d":
579
delta = datetime.timedelta(value)
580
elif suffix == u"s":
581
delta = datetime.timedelta(0, value)
582
elif suffix == u"m":
583
delta = datetime.timedelta(0, 0, 0, 0, value)
584
elif suffix == u"h":
585
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
586
elif suffix == u"w":
587
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
588
else:
589
raise ValueError
590
except (ValueError, IndexError):
486
try:
487
suffix=unicode(interval[-1])
488
value=int(interval[:-1])
489
if suffix == u"d":
490
delta = datetime.timedelta(value)
491
elif suffix == u"s":
492
delta = datetime.timedelta(0, value)
493
elif suffix == u"m":
494
delta = datetime.timedelta(0, 0, 0, 0, value)
495
elif suffix == u"h":
496
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
497
elif suffix == u"w":
498
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
499
else:
591
500
raise ValueError
592
timevalue += delta
593
return timevalue
501
except (ValueError, IndexError):
502
raise ValueError
503
return delta
504
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()
594
537
595
538
596
539
def server_state_changed(state):
597
540
"""Derived from the Avahi example code"""
598
541
if state == avahi.SERVER_COLLISION:
599
logger.error(u"Server name collision")
600
service.remove()
542
logger.warning(u"Server name collision")
543
remove_service()
601
544
elif state == avahi.SERVER_RUNNING:
602
service.add()
545
add_service()
603
546
604
547
605
548
def entry_group_state_changed(state, error):
606
549
"""Derived from the Avahi example code"""
550
global serviceName, server, rename_count
551
607
552
logger.debug(u"state change: %i", state)
608
553
609
554
if state == avahi.ENTRY_GROUP_ESTABLISHED:
610
555
logger.debug(u"Service established.")
611
556
elif state == avahi.ENTRY_GROUP_COLLISION:
612
logger.warning(u"Service name collision.")
613
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)
614
570
elif state == avahi.ENTRY_GROUP_FAILURE:
615
logger.critical(u"Error in group state changed %s",
616
unicode(error))
617
raise AvahiGroupError("State changed: %s", str(error))
571
logger.error(u"Error in group state changed %s",
572
unicode(error))
573
killme(1)
574
618
575
619
576
def if_nametoindex(interface):
620
"""Call the C function if_nametoindex(), or equivalent"""
621
global if_nametoindex
577
"""Call the C function if_nametoindex()"""
622
578
try:
623
if "ctypes.util" not in sys.modules:
624
import ctypes.util
625
if_nametoindex = ctypes.cdll.LoadLibrary\
626
(ctypes.util.find_library("c")).if_nametoindex
579
libc = ctypes.cdll.LoadLibrary("libc.so.6")
580
return libc.if_nametoindex(interface)
627
581
except (OSError, AttributeError):
628
582
if "struct" not in sys.modules:
629
583
import struct
630
584
if "fcntl" not in sys.modules:
631
585
import fcntl
632
def if_nametoindex(interface):
633
"Get an interface index the hard way, i.e. using fcntl()"
634
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
635
s = socket.socket()
636
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
637
struct.pack("16s16x", interface))
638
s.close()
639
interface_index = struct.unpack("I", ifreq[16:20])[0]
640
return interface_index
641
return if_nametoindex(interface)
642
643
644
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):
645
596
"""See daemon(3). Standard BSD Unix function.
646
597
This should really exist as os.daemon, but it doesn't (yet)."""
647
598
if os.fork():
649
600
os.setsid()
650
601
if not nochdir:
651
602
os.chdir("/")
652
if os.fork():
653
sys.exit()
654
603
if not noclose:
655
604
# Close all standard open file descriptors
656
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
605
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
657
606
if not stat.S_ISCHR(os.fstat(null).st_mode):
658
607
raise OSError(errno.ENODEV,
659
608
"/dev/null not a character device")
664
613
os.close(null)
665
614
666
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
667
625
def main():
626
global exitstatus
627
exitstatus = 0
668
628
global main_loop_started
669
629
main_loop_started = False
670
630
671
parser = OptionParser(version = "%%prog %s" % version)
631
parser = OptionParser()
672
632
parser.add_option("-i", "--interface", type="string",
673
metavar="IF", help="Bind to interface IF")
674
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,
675
636
help="Address to listen for requests on")
676
parser.add_option("-p", "--port", type="int",
637
parser.add_option("-p", "--port", type="int", default=None,
677
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")
678
645
parser.add_option("--check", action="store_true", default=False,
679
646
help="Run self-test")
680
parser.add_option("--debug", action="store_true",
681
help="Debug mode; run in foreground and log to"
682
" terminal")
683
parser.add_option("--priority", type="string", help="GnuTLS"
684
" priority string (see GnuTLS documentation)")
685
parser.add_option("--servicename", type="string", metavar="NAME",
686
help="Zeroconf service name")
687
parser.add_option("--configdir", type="string",
688
default="/etc/mandos", metavar="DIR",
689
help="Directory to search for configuration"
690
" files")
647
parser.add_option("--debug", action="store_true", default=False,
648
help="Debug mode")
691
649
(options, args) = parser.parse_args()
692
650
693
651
if options.check:
695
653
doctest.testmod()
696
654
sys.exit()
697
655
698
# Default values for config file for server-global settings
699
server_defaults = { "interface": "",
700
"address": "",
701
"port": "",
702
"debug": "False",
703
"priority":
704
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
705
"servicename": "Mandos",
706
}
707
708
# Parse config file for server-global settings
709
server_config = ConfigParser.SafeConfigParser(server_defaults)
710
del server_defaults
711
server_config.read(os.path.join(options.configdir, "mandos.conf"))
712
# Convert the SafeConfigParser object to a dict
713
server_settings = server_config.defaults()
714
# Use getboolean on the boolean config option
715
server_settings["debug"] = server_config.getboolean\
716
("DEFAULT", "debug")
717
del server_config
718
719
# Override the settings from the config file with command line
720
# options, if set.
721
for option in ("interface", "address", "port", "debug",
722
"priority", "servicename", "configdir"):
723
value = getattr(options, option)
724
if value is not None:
725
server_settings[option] = value
726
del options
727
# Now we have our good server settings in "server_settings"
728
729
debug = server_settings["debug"]
730
731
if not debug:
732
syslogger.setLevel(logging.WARNING)
733
console.setLevel(logging.WARNING)
734
735
if server_settings["servicename"] != "Mandos":
736
syslogger.setFormatter(logging.Formatter\
737
('Mandos (%s): %%(levelname)s:'
738
' %%(message)s'
739
% server_settings["servicename"]))
740
741
# Parse config file with clients
742
client_defaults = { "timeout": "1h",
743
"interval": "5m",
744
"checker": "fping -q -- %(host)s",
745
"host": "",
746
}
747
client_config = ConfigParser.SafeConfigParser(client_defaults)
748
client_config.read(os.path.join(server_settings["configdir"],
749
"clients.conf"))
750
751
global service
752
service = AvahiService(name = server_settings["servicename"],
753
type = "_mandos._tcp", );
754
if server_settings["interface"]:
755
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")
756
671
757
672
global main_loop
758
673
global bus
766
681
avahi.DBUS_INTERFACE_SERVER )
767
682
# End of Avahi example code
768
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
769
694
clients = Set()
770
695
def remove_from_clients(client):
771
696
clients.remove(client)
772
697
if not clients:
773
logger.critical(u"No clients left, exiting")
774
sys.exit()
698
logger.debug(u"No clients left, exiting")
699
killme()
775
700
776
clients.update(Set(Client(name = section,
701
clients.update(Set(Client(name=section, options=options,
777
702
stop_hook = remove_from_clients,
778
config
779
= dict(client_config.items(section)))
703
**(dict(client_config\
704
.items(section))))
780
705
for section in client_config.sections()))
781
if not clients:
782
logger.critical(u"No clients defined")
783
sys.exit(1)
784
785
if debug:
786
# Redirect stdin so all checkers get /dev/null
787
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
788
os.dup2(null, sys.stdin.fileno())
789
if null > 2:
790
os.close(null)
791
else:
792
# No console logging
793
logger.removeHandler(console)
794
# Close all input and output, do double fork, etc.
795
daemon()
796
797
pidfilename = "/var/run/mandos/mandos.pid"
798
pid = os.getpid()
799
try:
800
pidfile = open(pidfilename, "w")
801
pidfile.write(str(pid) + "\n")
802
pidfile.close()
803
del pidfile
804
except IOError, err:
805
logger.error(u"Could not write %s file with PID %d",
806
pidfilename, os.getpid())
706
707
if not debug:
708
daemon(False, False)
807
709
808
710
def cleanup():
809
711
"Cleanup function; run on exit"
823
725
824
726
if not debug:
825
727
signal.signal(signal.SIGINT, signal.SIG_IGN)
826
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
827
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())
828
730
829
731
for client in clients:
830
732
client.start()
831
733
832
tcp_server = IPv6_TCPServer((server_settings["address"],
833
server_settings["port"]),
734
tcp_server = IPv6_TCPServer((options.address, options.port),
834
735
tcp_handler,
835
settings=server_settings,
736
options=options,
836
737
clients=clients)
837
# Find out what port we got
838
service.port = tcp_server.socket.getsockname()[1]
839
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
840
u" scope_id %d" % tcp_server.socket.getsockname())
841
842
#service.interface = tcp_server.socket.getsockname()[3]
843
844
try:
845
# From the Avahi example code
846
server.connect_to_signal("StateChanged", server_state_changed)
847
try:
848
server_state_changed(server.GetState())
849
except dbus.exceptions.DBusException, error:
850
logger.critical(u"DBusException: %s", error)
851
sys.exit(1)
852
# End of Avahi example code
853
854
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
855
lambda *args, **kwargs:
856
tcp_server.handle_request\
857
(*args[2:], **kwargs) or True)
858
859
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")
860
762
main_loop_started = True
861
763
main_loop.run()
862
except AvahiError, error:
863
logger.critical(u"AvahiError: %s" + unicode(error))
864
sys.exit(1)
865
764
except KeyboardInterrupt:
866
765
if debug:
867
766
print
767
768
sys.exit(exitstatus)
868
769
869
770
if __name__ == '__main__':
870
771
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0