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- Committer: Teddy Hogeborn
- Date: 2008-07-21 23:18:02 UTC
- mfrom: (15.1.5 mandos) (15.1.5 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080721231802-0emzdsxkfy457p9u
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
# 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)
413
# Verify the self signature in the key
414
crtverify = ctypes.c_uint();
415
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
416
(crt, ctypes.c_uint(0), ctypes.byref(crtverify))
417
if crtverify.value != 0:
418
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
419
raise gnutls.errors.CertificateSecurityError("Verify failed")
346
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
347
(crt,
348
ctypes.byref(datum),
349
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
420
350
# New buffer for the fingerprint
421
351
buffer = ctypes.create_string_buffer(20)
422
352
buffer_length = ctypes.c_size_t()
438
368
Note: This will run in its own forked process."""
439
369
440
370
def handle(self):
441
logger.info(u"TCP connection from: %s",
371
logger.debug(u"TCP connection from: %s",
442
372
unicode(self.client_address))
443
session = gnutls.connection.ClientSession\
444
(self.request, gnutls.connection.X509Credentials())
445
446
line = self.request.makefile().readline()
447
logger.debug(u"Protocol version: %r", line)
448
try:
449
if int(line.strip().split()[0]) > 1:
450
raise RuntimeError
451
except (ValueError, IndexError, RuntimeError), error:
452
logger.error(u"Unknown protocol version: %s", error)
453
return
454
455
# Note: gnutls.connection.X509Credentials is really a generic
456
# GnuTLS certificate credentials object so long as no X.509
457
# keys are added to it. Therefore, we can use it here despite
458
# using OpenPGP certificates.
373
session = gnutls.connection.ClientSession(self.request,
374
gnutls.connection.\
375
X509Credentials())
459
376
460
377
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
461
378
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
462
379
# "+DHE-DSS"))
463
priority = "NORMAL" # Fallback default, since this
464
# MUST be set.
465
if self.server.settings["priority"]:
466
priority = self.server.settings["priority"]
380
priority = "SECURE256"
381
467
382
gnutls.library.functions.gnutls_priority_set_direct\
468
383
(session._c_object, priority, None);
469
384
470
385
try:
471
386
session.handshake()
472
387
except gnutls.errors.GNUTLSError, error:
473
logger.warning(u"Handshake failed: %s", error)
388
logger.debug(u"Handshake failed: %s", error)
474
389
# Do not run session.bye() here: the session is not
475
390
# established. Just abandon the request.
476
391
return
477
392
try:
478
393
fpr = fingerprint(peer_certificate(session))
479
394
except (TypeError, gnutls.errors.GNUTLSError), error:
480
logger.warning(u"Bad certificate: %s", error)
395
logger.debug(u"Bad certificate: %s", error)
481
396
session.bye()
482
397
return
483
398
logger.debug(u"Fingerprint: %s", fpr)
486
401
if c.fingerprint == fpr:
487
402
client = c
488
403
break
489
if not client:
490
logger.warning(u"Client not found for fingerprint: %s",
491
fpr)
492
session.bye()
493
return
494
404
# Have to check if client.still_valid(), since it is possible
495
405
# that the client timed out while establishing the GnuTLS
496
406
# session.
497
if not client.still_valid():
498
logger.warning(u"Client %(name)s is invalid",
499
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)
500
414
session.bye()
501
415
return
502
416
sent_size = 0
512
426
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
513
427
"""IPv6 TCP server. Accepts 'None' as address and/or port.
514
428
Attributes:
515
settings: Server settings
429
options: Command line options
516
430
clients: Set() of Client objects
517
431
"""
518
432
address_family = socket.AF_INET6
519
433
def __init__(self, *args, **kwargs):
520
if "settings" in kwargs:
521
self.settings = kwargs["settings"]
522
del kwargs["settings"]
434
if "options" in kwargs:
435
self.options = kwargs["options"]
436
del kwargs["options"]
523
437
if "clients" in kwargs:
524
438
self.clients = kwargs["clients"]
525
439
del kwargs["clients"]
528
442
"""This overrides the normal server_bind() function
529
443
to bind to an interface if one was specified, and also NOT to
530
444
bind to an address or port if they were not specified."""
531
if self.settings["interface"]:
532
# 25 is from /usr/include/asm-i486/socket.h
533
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
534
449
try:
535
450
self.socket.setsockopt(socket.SOL_SOCKET,
536
SO_BINDTODEVICE,
537
self.settings["interface"])
451
socket.SO_BINDTODEVICE,
452
self.options.interface)
538
453
except socket.error, error:
539
454
if error[0] == errno.EPERM:
540
logger.error(u"No permission to"
541
u" bind to interface %s",
542
self.settings["interface"])
455
logger.warning(u"No permission to"
456
u" bind to interface %s",
457
self.options.interface)
543
458
else:
544
459
raise error
545
460
# Only bind(2) the socket if we really need to.
548
463
in6addr_any = "::"
549
464
self.server_address = (in6addr_any,
550
465
self.server_address[1])
551
elif not self.server_address[1]:
466
elif self.server_address[1] is None:
552
467
self.server_address = (self.server_address[0],
553
468
0)
554
# if self.settings["interface"]:
555
# self.server_address = (self.server_address[0],
556
# 0, # port
557
# 0, # flowinfo
558
# if_nametoindex
559
# (self.settings
560
# ["interface"]))
561
469
return super(type(self), self).server_bind()
562
470
563
471
574
482
datetime.timedelta(1)
575
483
>>> string_to_delta(u'1w')
576
484
datetime.timedelta(7)
577
>>> string_to_delta('5m 30s')
578
datetime.timedelta(0, 330)
579
485
"""
580
timevalue = datetime.timedelta(0)
581
for s in interval.split():
582
try:
583
suffix=unicode(s[-1])
584
value=int(s[:-1])
585
if suffix == u"d":
586
delta = datetime.timedelta(value)
587
elif suffix == u"s":
588
delta = datetime.timedelta(0, value)
589
elif suffix == u"m":
590
delta = datetime.timedelta(0, 0, 0, 0, value)
591
elif suffix == u"h":
592
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
593
elif suffix == u"w":
594
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
595
else:
596
raise ValueError
597
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:
598
500
raise ValueError
599
timevalue += delta
600
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()
601
537
602
538
603
539
def server_state_changed(state):
604
540
"""Derived from the Avahi example code"""
605
541
if state == avahi.SERVER_COLLISION:
606
logger.error(u"Server name collision")
607
service.remove()
542
logger.warning(u"Server name collision")
543
remove_service()
608
544
elif state == avahi.SERVER_RUNNING:
609
service.add()
545
add_service()
610
546
611
547
612
548
def entry_group_state_changed(state, error):
613
549
"""Derived from the Avahi example code"""
550
global serviceName, server, rename_count
551
614
552
logger.debug(u"state change: %i", state)
615
553
616
554
if state == avahi.ENTRY_GROUP_ESTABLISHED:
617
555
logger.debug(u"Service established.")
618
556
elif state == avahi.ENTRY_GROUP_COLLISION:
619
logger.warning(u"Service name collision.")
620
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)
621
570
elif state == avahi.ENTRY_GROUP_FAILURE:
622
logger.critical(u"Error in group state changed %s",
623
unicode(error))
624
raise AvahiGroupError("State changed: %s", str(error))
571
logger.error(u"Error in group state changed %s",
572
unicode(error))
573
killme(1)
574
625
575
626
576
def if_nametoindex(interface):
627
"""Call the C function if_nametoindex(), or equivalent"""
628
global if_nametoindex
577
"""Call the C function if_nametoindex()"""
629
578
try:
630
if "ctypes.util" not in sys.modules:
631
import ctypes.util
632
if_nametoindex = ctypes.cdll.LoadLibrary\
633
(ctypes.util.find_library("c")).if_nametoindex
579
libc = ctypes.cdll.LoadLibrary("libc.so.6")
580
return libc.if_nametoindex(interface)
634
581
except (OSError, AttributeError):
635
582
if "struct" not in sys.modules:
636
583
import struct
637
584
if "fcntl" not in sys.modules:
638
585
import fcntl
639
def if_nametoindex(interface):
640
"Get an interface index the hard way, i.e. using fcntl()"
641
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
642
s = socket.socket()
643
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
644
struct.pack("16s16x", interface))
645
s.close()
646
interface_index = struct.unpack("I", ifreq[16:20])[0]
647
return interface_index
648
return if_nametoindex(interface)
649
650
651
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):
652
596
"""See daemon(3). Standard BSD Unix function.
653
597
This should really exist as os.daemon, but it doesn't (yet)."""
654
598
if os.fork():
656
600
os.setsid()
657
601
if not nochdir:
658
602
os.chdir("/")
659
if os.fork():
660
sys.exit()
661
603
if not noclose:
662
604
# Close all standard open file descriptors
663
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
605
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
664
606
if not stat.S_ISCHR(os.fstat(null).st_mode):
665
607
raise OSError(errno.ENODEV,
666
608
"/dev/null not a character device")
671
613
os.close(null)
672
614
673
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
674
625
def main():
626
global exitstatus
627
exitstatus = 0
675
628
global main_loop_started
676
629
main_loop_started = False
677
630
678
parser = OptionParser(version = "%%prog %s" % version)
631
parser = OptionParser()
679
632
parser.add_option("-i", "--interface", type="string",
680
metavar="IF", help="Bind to interface IF")
681
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,
682
636
help="Address to listen for requests on")
683
parser.add_option("-p", "--port", type="int",
637
parser.add_option("-p", "--port", type="int", default=None,
684
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")
685
645
parser.add_option("--check", action="store_true", default=False,
686
646
help="Run self-test")
687
parser.add_option("--debug", action="store_true",
688
help="Debug mode; run in foreground and log to"
689
" terminal")
690
parser.add_option("--priority", type="string", help="GnuTLS"
691
" priority string (see GnuTLS documentation)")
692
parser.add_option("--servicename", type="string", metavar="NAME",
693
help="Zeroconf service name")
694
parser.add_option("--configdir", type="string",
695
default="/etc/mandos", metavar="DIR",
696
help="Directory to search for configuration"
697
" files")
647
parser.add_option("--debug", action="store_true", default=False,
648
help="Debug mode")
698
649
(options, args) = parser.parse_args()
699
650
700
651
if options.check:
702
653
doctest.testmod()
703
654
sys.exit()
704
655
705
# Default values for config file for server-global settings
706
server_defaults = { "interface": "",
707
"address": "",
708
"port": "",
709
"debug": "False",
710
"priority":
711
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
712
"servicename": "Mandos",
713
}
714
715
# Parse config file for server-global settings
716
server_config = ConfigParser.SafeConfigParser(server_defaults)
717
del server_defaults
718
server_config.read(os.path.join(options.configdir, "mandos.conf"))
719
# Convert the SafeConfigParser object to a dict
720
server_settings = server_config.defaults()
721
# Use getboolean on the boolean config option
722
server_settings["debug"] = server_config.getboolean\
723
("DEFAULT", "debug")
724
del server_config
725
726
# Override the settings from the config file with command line
727
# options, if set.
728
for option in ("interface", "address", "port", "debug",
729
"priority", "servicename", "configdir"):
730
value = getattr(options, option)
731
if value is not None:
732
server_settings[option] = value
733
del options
734
# Now we have our good server settings in "server_settings"
735
736
debug = server_settings["debug"]
737
738
if not debug:
739
syslogger.setLevel(logging.WARNING)
740
console.setLevel(logging.WARNING)
741
742
if server_settings["servicename"] != "Mandos":
743
syslogger.setFormatter(logging.Formatter\
744
('Mandos (%s): %%(levelname)s:'
745
' %%(message)s'
746
% server_settings["servicename"]))
747
748
# Parse config file with clients
749
client_defaults = { "timeout": "1h",
750
"interval": "5m",
751
"checker": "fping -q -- %(host)s",
752
"host": "",
753
}
754
client_config = ConfigParser.SafeConfigParser(client_defaults)
755
client_config.read(os.path.join(server_settings["configdir"],
756
"clients.conf"))
757
758
global service
759
service = AvahiService(name = server_settings["servicename"],
760
type = "_mandos._tcp", );
761
if server_settings["interface"]:
762
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")
763
671
764
672
global main_loop
765
673
global bus
773
681
avahi.DBUS_INTERFACE_SERVER )
774
682
# End of Avahi example code
775
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
776
694
clients = Set()
777
695
def remove_from_clients(client):
778
696
clients.remove(client)
779
697
if not clients:
780
logger.critical(u"No clients left, exiting")
781
sys.exit()
698
logger.debug(u"No clients left, exiting")
699
killme()
782
700
783
clients.update(Set(Client(name = section,
701
clients.update(Set(Client(name=section, options=options,
784
702
stop_hook = remove_from_clients,
785
config
786
= dict(client_config.items(section)))
703
**(dict(client_config\
704
.items(section))))
787
705
for section in client_config.sections()))
788
if not clients:
789
logger.critical(u"No clients defined")
790
sys.exit(1)
791
792
if debug:
793
# Redirect stdin so all checkers get /dev/null
794
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
795
os.dup2(null, sys.stdin.fileno())
796
if null > 2:
797
os.close(null)
798
else:
799
# No console logging
800
logger.removeHandler(console)
801
# Close all input and output, do double fork, etc.
802
daemon()
803
804
pidfilename = "/var/run/mandos/mandos.pid"
805
pid = os.getpid()
806
try:
807
pidfile = open(pidfilename, "w")
808
pidfile.write(str(pid) + "\n")
809
pidfile.close()
810
del pidfile
811
except IOError, err:
812
logger.error(u"Could not write %s file with PID %d",
813
pidfilename, os.getpid())
706
707
if not debug:
708
daemon(False, False)
814
709
815
710
def cleanup():
816
711
"Cleanup function; run on exit"
830
725
831
726
if not debug:
832
727
signal.signal(signal.SIGINT, signal.SIG_IGN)
833
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
834
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())
835
730
836
731
for client in clients:
837
732
client.start()
838
733
839
tcp_server = IPv6_TCPServer((server_settings["address"],
840
server_settings["port"]),
734
tcp_server = IPv6_TCPServer((options.address, options.port),
841
735
tcp_handler,
842
settings=server_settings,
736
options=options,
843
737
clients=clients)
844
# Find out what port we got
845
service.port = tcp_server.socket.getsockname()[1]
846
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
847
u" scope_id %d" % tcp_server.socket.getsockname())
848
849
#service.interface = tcp_server.socket.getsockname()[3]
850
851
try:
852
# From the Avahi example code
853
server.connect_to_signal("StateChanged", server_state_changed)
854
try:
855
server_state_changed(server.GetState())
856
except dbus.exceptions.DBusException, error:
857
logger.critical(u"DBusException: %s", error)
858
sys.exit(1)
859
# End of Avahi example code
860
861
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
862
lambda *args, **kwargs:
863
tcp_server.handle_request\
864
(*args[2:], **kwargs) or True)
865
866
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")
867
762
main_loop_started = True
868
763
main_loop.run()
869
except AvahiError, error:
870
logger.critical(u"AvahiError: %s" + unicode(error))
871
sys.exit(1)
872
764
except KeyboardInterrupt:
873
765
if debug:
874
766
print
767
768
sys.exit(exitstatus)
875
769
876
770
if __name__ == '__main__':
877
771
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0