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- Committer: Björn Påhlsson
- Date: 2008-08-24 10:19:59 UTC
- mfrom: (98 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 99.
- Revision ID: belorn@braxen-20080824101959-cbs6x05jwgqrlp2s
merge + fallback bugg
- 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
# 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="/")
282
347
self.checker_callback_tag = gobject.child_watch_add\
283
348
(self.checker.pid,
284
349
self.checker_callback)
285
except subprocess.OSError, error:
350
except OSError, error:
286
351
logger.error(u"Failed to start subprocess: %s",
287
352
error)
288
353
# Re-run this periodically if run by gobject.timeout_add
292
357
if self.checker_callback_tag:
293
358
gobject.source_remove(self.checker_callback_tag)
294
359
self.checker_callback_tag = None
295
if not hasattr(self, "checker") or self.checker is None:
360
if getattr(self, "checker", None) is None:
296
361
return
297
logger.debug("Stopping checker for %(name)s", vars(self))
362
logger.debug(u"Stopping checker for %(name)s", vars(self))
298
363
try:
299
364
os.kill(self.checker.pid, signal.SIGTERM)
300
365
#os.sleep(0.5)
301
366
#if self.checker.poll() is None:
302
367
# os.kill(self.checker.pid, signal.SIGKILL)
303
368
except OSError, error:
304
if error.errno != errno.ESRCH:
369
if error.errno != errno.ESRCH: # No such process
305
370
raise
306
371
self.checker = None
307
def still_valid(self, now=None):
372
def still_valid(self):
308
373
"""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:
374
now = datetime.datetime.now()
375
if self.last_checked_ok is None:
312
376
return now < (self.created + self.timeout)
313
377
else:
314
return now < (self.last_seen + self.timeout)
378
return now < (self.last_checked_ok + self.timeout)
315
379
316
380
317
381
def peer_certificate(session):
333
397
334
398
def fingerprint(openpgp):
335
399
"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
400
# New GnuTLS "datum" with the OpenPGP public key
341
401
datum = gnutls.library.types.gnutls_datum_t\
342
402
(ctypes.cast(ctypes.c_char_p(openpgp),
343
403
ctypes.POINTER(ctypes.c_ubyte)),
344
404
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))
345
409
# 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)
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 != 0:
418
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
419
raise gnutls.errors.CertificateSecurityError("Verify failed")
350
420
# New buffer for the fingerprint
351
421
buffer = ctypes.create_string_buffer(20)
352
422
buffer_length = ctypes.c_size_t()
368
438
Note: This will run in its own forked process."""
369
439
370
440
def handle(self):
371
logger.debug(u"TCP connection from: %s",
441
logger.info(u"TCP connection from: %s",
372
442
unicode(self.client_address))
373
session = gnutls.connection.ClientSession(self.request,
374
gnutls.connection.\
375
X509Credentials())
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.
376
459
377
460
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
378
461
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
379
462
# "+DHE-DSS"))
380
priority = "SECURE256"
381
463
priority = "NORMAL" # Fallback default, since this
464
# MUST be set.
465
if self.server.settings["priority"]:
466
priority = self.server.settings["priority"]
382
467
gnutls.library.functions.gnutls_priority_set_direct\
383
468
(session._c_object, priority, None);
384
469
385
470
try:
386
471
session.handshake()
387
472
except gnutls.errors.GNUTLSError, error:
388
logger.debug(u"Handshake failed: %s", error)
473
logger.warning(u"Handshake failed: %s", error)
389
474
# Do not run session.bye() here: the session is not
390
475
# established. Just abandon the request.
391
476
return
392
477
try:
393
478
fpr = fingerprint(peer_certificate(session))
394
479
except (TypeError, gnutls.errors.GNUTLSError), error:
395
logger.debug(u"Bad certificate: %s", error)
480
logger.warning(u"Bad certificate: %s", error)
396
481
session.bye()
397
482
return
398
483
logger.debug(u"Fingerprint: %s", fpr)
401
486
if c.fingerprint == fpr:
402
487
client = c
403
488
break
489
if not client:
490
logger.warning(u"Client not found for fingerprint: %s",
491
fpr)
492
session.bye()
493
return
404
494
# Have to check if client.still_valid(), since it is possible
405
495
# that the client timed out while establishing the GnuTLS
406
496
# 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)
497
if not client.still_valid():
498
logger.warning(u"Client %(name)s is invalid",
499
vars(client))
414
500
session.bye()
415
501
return
416
502
sent_size = 0
426
512
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
427
513
"""IPv6 TCP server. Accepts 'None' as address and/or port.
428
514
Attributes:
429
options: Command line options
515
settings: Server settings
430
516
clients: Set() of Client objects
431
517
"""
432
518
address_family = socket.AF_INET6
433
519
def __init__(self, *args, **kwargs):
434
if "options" in kwargs:
435
self.options = kwargs["options"]
436
del kwargs["options"]
520
if "settings" in kwargs:
521
self.settings = kwargs["settings"]
522
del kwargs["settings"]
437
523
if "clients" in kwargs:
438
524
self.clients = kwargs["clients"]
439
525
del kwargs["clients"]
442
528
"""This overrides the normal server_bind() function
443
529
to bind to an interface if one was specified, and also NOT to
444
530
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
531
if self.settings["interface"]:
532
# 25 is from /usr/include/asm-i486/socket.h
533
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
449
534
try:
450
535
self.socket.setsockopt(socket.SOL_SOCKET,
451
socket.SO_BINDTODEVICE,
452
self.options.interface)
536
SO_BINDTODEVICE,
537
self.settings["interface"])
453
538
except socket.error, error:
454
539
if error[0] == errno.EPERM:
455
logger.warning(u"No permission to"
456
u" bind to interface %s",
457
self.options.interface)
540
logger.error(u"No permission to"
541
u" bind to interface %s",
542
self.settings["interface"])
458
543
else:
459
544
raise error
460
545
# Only bind(2) the socket if we really need to.
463
548
in6addr_any = "::"
464
549
self.server_address = (in6addr_any,
465
550
self.server_address[1])
466
elif self.server_address[1] is None:
551
elif not self.server_address[1]:
467
552
self.server_address = (self.server_address[0],
468
553
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"]))
469
561
return super(type(self), self).server_bind()
470
562
471
563
482
574
datetime.timedelta(1)
483
575
>>> string_to_delta(u'1w')
484
576
datetime.timedelta(7)
577
>>> string_to_delta('5m 30s')
578
datetime.timedelta(0, 330)
485
579
"""
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:
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):
500
598
raise ValueError
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()
599
timevalue += delta
600
return timevalue
537
601
538
602
539
603
def server_state_changed(state):
540
604
"""Derived from the Avahi example code"""
541
605
if state == avahi.SERVER_COLLISION:
542
logger.warning(u"Server name collision")
543
remove_service()
606
logger.error(u"Server name collision")
607
service.remove()
544
608
elif state == avahi.SERVER_RUNNING:
545
add_service()
609
service.add()
546
610
547
611
548
612
def entry_group_state_changed(state, error):
549
613
"""Derived from the Avahi example code"""
550
global serviceName, server, rename_count
551
552
614
logger.debug(u"state change: %i", state)
553
615
554
616
if state == avahi.ENTRY_GROUP_ESTABLISHED:
555
617
logger.debug(u"Service established.")
556
618
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)
619
logger.warning(u"Service name collision.")
620
service.rename()
570
621
elif state == avahi.ENTRY_GROUP_FAILURE:
571
logger.error(u"Error in group state changed %s",
572
unicode(error))
573
killme(1)
574
622
logger.critical(u"Error in group state changed %s",
623
unicode(error))
624
raise AvahiGroupError("State changed: %s", str(error))
575
625
576
626
def if_nametoindex(interface):
577
"""Call the C function if_nametoindex()"""
627
"""Call the C function if_nametoindex(), or equivalent"""
628
global if_nametoindex
578
629
try:
579
libc = ctypes.cdll.LoadLibrary("libc.so.6")
580
return libc.if_nametoindex(interface)
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
581
634
except (OSError, AttributeError):
582
635
if "struct" not in sys.modules:
583
636
import struct
584
637
if "fcntl" not in sys.modules:
585
638
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):
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):
596
652
"""See daemon(3). Standard BSD Unix function.
597
653
This should really exist as os.daemon, but it doesn't (yet)."""
598
654
if os.fork():
600
656
os.setsid()
601
657
if not nochdir:
602
658
os.chdir("/")
659
if os.fork():
660
sys.exit()
603
661
if not noclose:
604
662
# Close all standard open file descriptors
605
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
663
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
606
664
if not stat.S_ISCHR(os.fstat(null).st_mode):
607
665
raise OSError(errno.ENODEV,
608
666
"/dev/null not a character device")
613
671
os.close(null)
614
672
615
673
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
674
def main():
626
global exitstatus
627
exitstatus = 0
628
675
global main_loop_started
629
676
main_loop_started = False
630
677
631
parser = OptionParser()
678
parser = OptionParser(version = "%%prog %s" % version)
632
679
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,
680
metavar="IF", help="Bind to interface IF")
681
parser.add_option("-a", "--address", type="string",
636
682
help="Address to listen for requests on")
637
parser.add_option("-p", "--port", type="int", default=None,
683
parser.add_option("-p", "--port", type="int",
638
684
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
685
parser.add_option("--check", action="store_true", default=False,
646
686
help="Run self-test")
647
parser.add_option("--debug", action="store_true", default=False,
648
help="Debug mode")
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")
649
698
(options, args) = parser.parse_args()
650
699
651
700
if options.check:
653
702
doctest.testmod()
654
703
sys.exit()
655
704
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")
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"])
671
763
672
764
global main_loop
673
765
global bus
681
773
avahi.DBUS_INTERFACE_SERVER )
682
774
# End of Avahi example code
683
775
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
776
clients = Set()
695
777
def remove_from_clients(client):
696
778
clients.remove(client)
697
779
if not clients:
698
logger.debug(u"No clients left, exiting")
699
killme()
780
logger.critical(u"No clients left, exiting")
781
sys.exit()
700
782
701
clients.update(Set(Client(name=section, options=options,
783
clients.update(Set(Client(name = section,
702
784
stop_hook = remove_from_clients,
703
**(dict(client_config\
704
.items(section))))
785
config
786
= dict(client_config.items(section)))
705
787
for section in client_config.sections()))
706
707
if not debug:
708
daemon(False, False)
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())
709
814
710
815
def cleanup():
711
816
"Cleanup function; run on exit"
725
830
726
831
if not debug:
727
832
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())
833
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
834
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
730
835
731
836
for client in clients:
732
837
client.start()
733
838
734
tcp_server = IPv6_TCPServer((options.address, options.port),
839
tcp_server = IPv6_TCPServer((server_settings["address"],
840
server_settings["port"]),
735
841
tcp_handler,
736
options=options,
842
settings=server_settings,
737
843
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")
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")
762
867
main_loop_started = True
763
868
main_loop.run()
869
except AvahiError, error:
870
logger.critical(u"AvahiError: %s" + unicode(error))
871
sys.exit(1)
764
872
except KeyboardInterrupt:
765
873
if debug:
766
874
print
767
768
sys.exit(exitstatus)
769
875
770
876
if __name__ == '__main__':
771
877
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0