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- Committer: Björn Påhlsson
- Date: 2008-07-20 02:52:20 UTC
- Revision ID: belorn@braxen-20080720025220-r5u0388uy9iu23h6
Added following support:
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
- 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
1
1
#!/usr/bin/python
2
# -*- mode: python; coding: utf-8 -*-
3
#
4
# Mandos server - give out binary blobs to connecting clients.
5
#
6
# This program is partly derived from an example program for an Avahi
7
# service publisher, downloaded from
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".
12
#
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
15
#
16
# This program is free software: you can redistribute it and/or modify
17
# it under the terms of the GNU General Public License as published by
18
# the Free Software Foundation, either version 3 of the License, or
19
# (at your option) any later version.
20
#
21
# This program is distributed in the hope that it will be useful,
22
# but WITHOUT ANY WARRANTY; without even the implied warranty of
23
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24
# GNU General Public License for more details.
25
#
26
# You should have received a copy of the GNU General Public License
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
28
#
29
# Contact the authors at <mandos@fukt.bsnet.se>.
30
#
31
2
32
3
from __future__ import division
33
4
50
21
import signal
51
22
from sets import Set
52
23
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
57
24
58
25
import dbus
59
26
import gobject
61
28
from dbus.mainloop.glib import DBusGMainLoop
62
29
import ctypes
63
30
64
version = "1.0"
31
import logging
32
import logging.handlers
33
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
65
35
66
36
logger = logging.Logger('mandos')
67
syslogger = logging.handlers.SysLogHandler\
68
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
address = "/dev/log")
70
syslogger.setFormatter(logging.Formatter\
71
('Mandos: %(levelname)s: %(message)s'))
72
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
163
# From the Avahi example code:
164
group = None # our entry group
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
38
39
# This variable is used to optionally bind to a specified interface.
40
# It is a global variable to fit in with the other variables from the
41
# Avahi server example code.
42
serviceInterface = avahi.IF_UNSPEC
43
# From the Avahi server example code:
44
serviceName = "Mandos"
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
46
servicePort = None # Not known at startup
47
serviceTXT = [] # TXT record for the service
48
domain = "" # Domain to publish on, default to .local
49
host = "" # Host to publish records for, default to localhost
50
group = None #our entry group
51
rename_count = 12 # Counter so we only rename after collisions a
52
# sensible number of times
165
53
# End of Avahi example code
166
54
167
55
172
60
fingerprint: string (40 or 32 hexadecimal digits); used to
173
61
uniquely identify the client
174
62
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
63
fqdn: string (FQDN); available for use by the checker command
64
created: datetime.datetime()
65
last_seen: datetime.datetime() or None if not yet seen
66
timeout: datetime.timedelta(); How long from last_seen until
67
this client is invalid
180
68
interval: datetime.timedelta(); How often to start a new checker
181
69
stop_hook: If set, called by stop() as stop_hook(self)
182
70
checker: subprocess.Popen(); a running checker process used
183
71
to see if the client lives.
184
'None' if no process is running.
72
Is None if no process is running.
185
73
checker_initiator_tag: a gobject event source tag, or None
186
74
stop_initiator_tag: - '' -
187
75
checker_callback_tag: - '' -
188
76
checker_command: string; External command which is run to check if
189
client lives. %() expansions are done at
77
client lives. %()s expansions are done at
190
78
runtime with vars(self) as dict, so that for
191
79
instance %(name)s can be used in the command.
192
80
Private attibutes:
193
81
_timeout: Real variable for 'timeout'
194
82
_interval: Real variable for 'interval'
195
_timeout_milliseconds: Used when calling gobject.timeout_add()
83
_timeout_milliseconds: Used by gobject.timeout_add()
196
84
_interval_milliseconds: - '' -
197
85
"""
198
86
def _set_timeout(self, timeout):
218
106
interval = property(lambda self: self._interval,
219
107
_set_interval)
220
108
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."""
109
def __init__(self, name=None, options=None, stop_hook=None,
110
fingerprint=None, secret=None, secfile=None, fqdn=None,
111
timeout=None, interval=-1, checker=None):
225
112
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"])
113
# Uppercase and remove spaces from fingerprint
114
# for later comparison purposes with return value of
115
# the fingerprint() function
116
self.fingerprint = fingerprint.upper().replace(u" ", u"")
117
if secret:
118
self.secret = secret.decode(u"base64")
119
elif secfile:
120
sf = open(secfile)
237
121
self.secret = sf.read()
238
122
sf.close()
239
123
else:
240
raise TypeError(u"No secret or secfile for client %s"
241
% self.name)
242
self.host = config.get("host", "")
124
raise RuntimeError(u"No secret or secfile for client %s"
125
% self.name)
126
self.fqdn = fqdn # string
243
127
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"])
128
self.last_seen = None
129
if timeout is None:
130
timeout = options.timeout
131
self.timeout = timeout
132
if interval == -1:
133
interval = options.interval
134
else:
135
interval = string_to_delta(interval)
136
self.interval = interval
247
137
self.stop_hook = stop_hook
248
138
self.checker = None
249
139
self.checker_initiator_tag = None
250
140
self.stop_initiator_tag = None
251
141
self.checker_callback_tag = None
252
self.check_command = config["checker"]
142
self.check_command = checker
253
143
def start(self):
254
"""Start this client's checker and timeout hooks"""
144
"""Start this clients checker and timeout hooks"""
255
145
# Schedule a new checker to be started an 'interval' from now,
256
146
# and every interval from then on.
257
147
self.checker_initiator_tag = gobject.timeout_add\
265
155
self.stop)
266
156
def stop(self):
267
157
"""Stop this client.
268
The possibility that a client might be restarted is left open,
269
but not currently used."""
270
# 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)
273
self.secret = None
274
else:
275
return False
276
if getattr(self, "stop_initiator_tag", False):
158
The possibility that this client might be restarted is left
159
open, but not currently used."""
160
logger.debug(u"Stopping client %s", self.name)
161
self.secret = None
162
if self.stop_initiator_tag:
277
163
gobject.source_remove(self.stop_initiator_tag)
278
164
self.stop_initiator_tag = None
279
if getattr(self, "checker_initiator_tag", False):
165
if self.checker_initiator_tag:
280
166
gobject.source_remove(self.checker_initiator_tag)
281
167
self.checker_initiator_tag = None
282
168
self.stop_checker()
285
171
# Do not run this again if called by a gobject.timeout_add
286
172
return False
287
173
def __del__(self):
288
self.stop_hook = None
289
self.stop()
174
# Some code duplication here and in stop()
175
if hasattr(self, "stop_initiator_tag") \
176
and self.stop_initiator_tag:
177
gobject.source_remove(self.stop_initiator_tag)
178
self.stop_initiator_tag = None
179
if hasattr(self, "checker_initiator_tag") \
180
and self.checker_initiator_tag:
181
gobject.source_remove(self.checker_initiator_tag)
182
self.checker_initiator_tag = None
183
self.stop_checker()
290
184
def checker_callback(self, pid, condition):
291
185
"""The checker has completed, so take appropriate actions."""
292
186
now = datetime.datetime.now()
293
self.checker_callback_tag = None
294
self.checker = None
295
187
if os.WIFEXITED(condition) \
296
188
and (os.WEXITSTATUS(condition) == 0):
297
logger.info(u"Checker for %(name)s succeeded",
298
vars(self))
299
self.last_checked_ok = now
189
logger.debug(u"Checker for %(name)s succeeded",
190
vars(self))
191
self.last_seen = now
300
192
gobject.source_remove(self.stop_initiator_tag)
301
193
self.stop_initiator_tag = gobject.timeout_add\
302
194
(self._timeout_milliseconds,
303
195
self.stop)
304
elif not os.WIFEXITED(condition):
196
if not os.WIFEXITED(condition):
305
197
logger.warning(u"Checker for %(name)s crashed?",
306
198
vars(self))
307
199
else:
308
logger.info(u"Checker for %(name)s failed",
309
vars(self))
200
logger.debug(u"Checker for %(name)s failed",
201
vars(self))
202
self.checker = None
203
self.checker_callback_tag = None
310
204
def start_checker(self):
311
205
"""Start a new checker subprocess if one is not running.
312
206
If a checker already exists, leave it running and do
313
207
nothing."""
314
# The reason for not killing a running checker is that if we
315
# did that, then if a checker (for some reason) started
316
# running slowly and taking more than 'interval' time, the
317
# client would inevitably timeout, since no checker would get
318
# a chance to run to completion. If we instead leave running
319
# checkers alone, the checker would have to take more time
320
# than 'timeout' for the client to be declared invalid, which
321
# is as it should be.
322
208
if self.checker is None:
209
logger.debug(u"Starting checker for %s",
210
self.name)
323
211
try:
324
# In case check_command has exactly one % operator
325
command = self.check_command % self.host
212
command = self.check_command % self.fqdn
326
213
except TypeError:
327
# Escape attributes for the shell
328
214
escaped_attrs = dict((key, re.escape(str(val)))
329
215
for key, val in
330
216
vars(self).iteritems())
331
217
try:
332
218
command = self.check_command % escaped_attrs
333
219
except TypeError, error:
334
logger.error(u'Could not format string "%s":'
335
u' %s', self.check_command, error)
220
logger.critical(u'Could not format string "%s": %s',
221
self.check_command, error)
336
222
return True # Try again later
337
223
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="/")
347
self.checker_callback_tag = gobject.child_watch_add\
348
(self.checker.pid,
349
self.checker_callback)
350
except OSError, error:
224
self.checker = subprocess.\
225
Popen(command,
226
stdout=subprocess.PIPE,
227
close_fds=True, shell=True,
228
cwd="/")
229
self.checker_callback_tag = gobject.\
230
child_watch_add(self.checker.pid,
231
self.\
232
checker_callback)
233
except subprocess.OSError, error:
351
234
logger.error(u"Failed to start subprocess: %s",
352
235
error)
353
236
# Re-run this periodically if run by gobject.timeout_add
354
237
return True
355
238
def stop_checker(self):
356
239
"""Force the checker process, if any, to stop."""
357
if self.checker_callback_tag:
358
gobject.source_remove(self.checker_callback_tag)
359
self.checker_callback_tag = None
360
if getattr(self, "checker", None) is None:
240
if not hasattr(self, "checker") or self.checker is None:
361
241
return
362
logger.debug(u"Stopping checker for %(name)s", vars(self))
363
try:
364
os.kill(self.checker.pid, signal.SIGTERM)
365
#os.sleep(0.5)
366
#if self.checker.poll() is None:
367
# os.kill(self.checker.pid, signal.SIGKILL)
368
except OSError, error:
369
if error.errno != errno.ESRCH: # No such process
370
raise
242
gobject.source_remove(self.checker_callback_tag)
243
self.checker_callback_tag = None
244
os.kill(self.checker.pid, signal.SIGTERM)
245
if self.checker.poll() is None:
246
os.kill(self.checker.pid, signal.SIGKILL)
371
247
self.checker = None
372
def still_valid(self):
248
def still_valid(self, now=None):
373
249
"""Has the timeout not yet passed for this client?"""
374
now = datetime.datetime.now()
375
if self.last_checked_ok is None:
250
if now is None:
251
now = datetime.datetime.now()
252
if self.last_seen is None:
376
253
return now < (self.created + self.timeout)
377
254
else:
378
return now < (self.last_checked_ok + self.timeout)
255
return now < (self.last_seen + self.timeout)
379
256
380
257
381
258
def peer_certificate(session):
382
"Return the peer's OpenPGP certificate as a bytestring"
383
259
# If not an OpenPGP certificate...
384
260
if gnutls.library.functions.gnutls_certificate_type_get\
385
261
(session._c_object) \
396
272
397
273
398
274
def fingerprint(openpgp):
399
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
275
# New empty GnuTLS certificate
276
crt = gnutls.library.types.gnutls_openpgp_crt_t()
277
gnutls.library.functions.gnutls_openpgp_crt_init\
278
(ctypes.byref(crt))
400
279
# New GnuTLS "datum" with the OpenPGP public key
401
280
datum = gnutls.library.types.gnutls_datum_t\
402
281
(ctypes.cast(ctypes.c_char_p(openpgp),
403
282
ctypes.POINTER(ctypes.c_ubyte)),
404
283
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
284
# 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
tmp = open("/tmp/tmp.gpg", "w")
419
tmp.write(openpgp)
420
tmp.close()
421
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
422
raise gnutls.errors.CertificateSecurityError("Verify failed")
285
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
(crt,
287
ctypes.byref(datum),
288
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
423
289
# New buffer for the fingerprint
424
290
buffer = ctypes.create_string_buffer(20)
425
291
buffer_length = ctypes.c_size_t()
441
307
Note: This will run in its own forked process."""
442
308
443
309
def handle(self):
444
logger.info(u"TCP connection from: %s",
310
logger.debug(u"TCP connection from: %s",
445
311
unicode(self.client_address))
446
session = gnutls.connection.ClientSession\
447
(self.request, gnutls.connection.X509Credentials())
448
449
line = self.request.makefile().readline()
450
logger.debug(u"Protocol version: %r", line)
451
try:
452
if int(line.strip().split()[0]) > 1:
453
raise RuntimeError
454
except (ValueError, IndexError, RuntimeError), error:
455
logger.error(u"Unknown protocol version: %s", error)
456
return
457
458
# Note: gnutls.connection.X509Credentials is really a generic
459
# GnuTLS certificate credentials object so long as no X.509
460
# keys are added to it. Therefore, we can use it here despite
461
# using OpenPGP certificates.
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
462
315
463
316
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
464
317
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
465
318
# "+DHE-DSS"))
466
priority = "NORMAL" # Fallback default, since this
467
# MUST be set.
468
if self.server.settings["priority"]:
469
priority = self.server.settings["priority"]
319
priority = "SECURE256"
320
470
321
gnutls.library.functions.gnutls_priority_set_direct\
471
322
(session._c_object, priority, None);
472
323
473
324
try:
474
325
session.handshake()
475
326
except gnutls.errors.GNUTLSError, error:
476
logger.warning(u"Handshake failed: %s", error)
327
logger.debug(u"Handshake failed: %s", error)
477
328
# Do not run session.bye() here: the session is not
478
329
# established. Just abandon the request.
479
330
return
480
331
try:
481
332
fpr = fingerprint(peer_certificate(session))
482
333
except (TypeError, gnutls.errors.GNUTLSError), error:
483
logger.warning(u"Bad certificate: %s", error)
334
logger.debug(u"Bad certificate: %s", error)
484
335
session.bye()
485
336
return
486
337
logger.debug(u"Fingerprint: %s", fpr)
487
338
client = None
488
for c in self.server.clients:
339
for c in clients:
489
340
if c.fingerprint == fpr:
490
341
client = c
491
342
break
492
if not client:
493
logger.warning(u"Client not found for fingerprint: %s",
494
fpr)
495
session.bye()
496
return
497
343
# Have to check if client.still_valid(), since it is possible
498
344
# that the client timed out while establishing the GnuTLS
499
345
# session.
500
if not client.still_valid():
501
logger.warning(u"Client %(name)s is invalid",
502
vars(client))
346
if (not client) or (not client.still_valid()):
347
if client:
348
logger.debug(u"Client %(name)s is invalid",
349
vars(client))
350
else:
351
logger.debug(u"Client not found for fingerprint: %s",
352
fpr)
503
353
session.bye()
504
354
return
505
355
sent_size = 0
515
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
516
366
"""IPv6 TCP server. Accepts 'None' as address and/or port.
517
367
Attributes:
518
settings: Server settings
368
options: Command line options
519
369
clients: Set() of Client objects
520
370
"""
521
371
address_family = socket.AF_INET6
522
372
def __init__(self, *args, **kwargs):
523
if "settings" in kwargs:
524
self.settings = kwargs["settings"]
525
del kwargs["settings"]
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
526
376
if "clients" in kwargs:
527
377
self.clients = kwargs["clients"]
528
378
del kwargs["clients"]
531
381
"""This overrides the normal server_bind() function
532
382
to bind to an interface if one was specified, and also NOT to
533
383
bind to an address or port if they were not specified."""
534
if self.settings["interface"]:
535
# 25 is from /usr/include/asm-i486/socket.h
536
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
384
if self.options.interface:
385
if not hasattr(socket, "SO_BINDTODEVICE"):
386
# From /usr/include/asm-i486/socket.h
387
socket.SO_BINDTODEVICE = 25
537
388
try:
538
389
self.socket.setsockopt(socket.SOL_SOCKET,
539
SO_BINDTODEVICE,
540
self.settings["interface"])
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
541
392
except socket.error, error:
542
393
if error[0] == errno.EPERM:
543
logger.error(u"No permission to"
544
u" bind to interface %s",
545
self.settings["interface"])
394
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
546
397
else:
547
398
raise error
548
399
# Only bind(2) the socket if we really need to.
551
402
in6addr_any = "::"
552
403
self.server_address = (in6addr_any,
553
404
self.server_address[1])
554
elif not self.server_address[1]:
405
elif self.server_address[1] is None:
555
406
self.server_address = (self.server_address[0],
556
407
0)
557
# if self.settings["interface"]:
558
# self.server_address = (self.server_address[0],
559
# 0, # port
560
# 0, # flowinfo
561
# if_nametoindex
562
# (self.settings
563
# ["interface"]))
564
408
return super(type(self), self).server_bind()
565
409
566
410
577
421
datetime.timedelta(1)
578
422
>>> string_to_delta(u'1w')
579
423
datetime.timedelta(7)
580
>>> string_to_delta('5m 30s')
581
datetime.timedelta(0, 330)
582
424
"""
583
timevalue = datetime.timedelta(0)
584
for s in interval.split():
585
try:
586
suffix=unicode(s[-1])
587
value=int(s[:-1])
588
if suffix == u"d":
589
delta = datetime.timedelta(value)
590
elif suffix == u"s":
591
delta = datetime.timedelta(0, value)
592
elif suffix == u"m":
593
delta = datetime.timedelta(0, 0, 0, 0, value)
594
elif suffix == u"h":
595
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
596
elif suffix == u"w":
597
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
598
else:
599
raise ValueError
600
except (ValueError, IndexError):
425
try:
426
suffix=unicode(interval[-1])
427
value=int(interval[:-1])
428
if suffix == u"d":
429
delta = datetime.timedelta(value)
430
elif suffix == u"s":
431
delta = datetime.timedelta(0, value)
432
elif suffix == u"m":
433
delta = datetime.timedelta(0, 0, 0, 0, value)
434
elif suffix == u"h":
435
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
436
elif suffix == u"w":
437
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
438
else:
601
439
raise ValueError
602
timevalue += delta
603
return timevalue
440
except (ValueError, IndexError):
441
raise ValueError
442
return delta
443
444
445
def add_service():
446
"""From the Avahi server example code"""
447
global group, serviceName, serviceType, servicePort, serviceTXT, \
448
domain, host
449
if group is None:
450
group = dbus.Interface(
451
bus.get_object( avahi.DBUS_NAME,
452
server.EntryGroupNew()),
453
avahi.DBUS_INTERFACE_ENTRY_GROUP)
454
group.connect_to_signal('StateChanged',
455
entry_group_state_changed)
456
logger.debug(u"Adding service '%s' of type '%s' ...",
457
serviceName, serviceType)
458
459
group.AddService(
460
serviceInterface, # interface
461
avahi.PROTO_INET6, # protocol
462
dbus.UInt32(0), # flags
463
serviceName, serviceType,
464
domain, host,
465
dbus.UInt16(servicePort),
466
avahi.string_array_to_txt_array(serviceTXT))
467
group.Commit()
468
469
470
def remove_service():
471
"""From the Avahi server example code"""
472
global group
473
474
if not group is None:
475
group.Reset()
604
476
605
477
606
478
def server_state_changed(state):
607
"""Derived from the Avahi example code"""
479
"""From the Avahi server example code"""
608
480
if state == avahi.SERVER_COLLISION:
609
logger.error(u"Server name collision")
610
service.remove()
481
logger.warning(u"Server name collision")
482
remove_service()
611
483
elif state == avahi.SERVER_RUNNING:
612
service.add()
484
add_service()
613
485
614
486
615
487
def entry_group_state_changed(state, error):
616
"""Derived from the Avahi example code"""
488
"""From the Avahi server example code"""
489
global serviceName, server, rename_count
490
617
491
logger.debug(u"state change: %i", state)
618
492
619
493
if state == avahi.ENTRY_GROUP_ESTABLISHED:
620
494
logger.debug(u"Service established.")
621
495
elif state == avahi.ENTRY_GROUP_COLLISION:
622
logger.warning(u"Service name collision.")
623
service.rename()
496
497
rename_count = rename_count - 1
498
if rename_count > 0:
499
name = server.GetAlternativeServiceName(name)
500
logger.warning(u"Service name collision, "
501
u"changing name to '%s' ...", name)
502
remove_service()
503
add_service()
504
505
else:
506
logger.error(u"No suitable service name found "
507
u"after %i retries, exiting.",
508
n_rename)
509
main_loop.quit()
624
510
elif state == avahi.ENTRY_GROUP_FAILURE:
625
logger.critical(u"Error in group state changed %s",
626
unicode(error))
627
raise AvahiGroupError("State changed: %s", str(error))
511
logger.error(u"Error in group state changed %s",
512
unicode(error))
513
main_loop.quit()
514
return
515
628
516
629
517
def if_nametoindex(interface):
630
"""Call the C function if_nametoindex(), or equivalent"""
631
global if_nametoindex
518
"""Call the C function if_nametoindex()"""
632
519
try:
633
if "ctypes.util" not in sys.modules:
634
import ctypes.util
635
if_nametoindex = ctypes.cdll.LoadLibrary\
636
(ctypes.util.find_library("c")).if_nametoindex
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
return libc.if_nametoindex(interface)
637
522
except (OSError, AttributeError):
638
523
if "struct" not in sys.modules:
639
524
import struct
640
525
if "fcntl" not in sys.modules:
641
526
import fcntl
642
def if_nametoindex(interface):
643
"Get an interface index the hard way, i.e. using fcntl()"
644
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
645
s = socket.socket()
646
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
647
struct.pack("16s16x", interface))
648
s.close()
649
interface_index = struct.unpack("I", ifreq[16:20])[0]
650
return interface_index
651
return if_nametoindex(interface)
652
653
654
def daemon(nochdir = False, noclose = False):
655
"""See daemon(3). Standard BSD Unix function.
656
This should really exist as os.daemon, but it doesn't (yet)."""
657
if os.fork():
658
sys.exit()
659
os.setsid()
660
if not nochdir:
661
os.chdir("/")
662
if os.fork():
663
sys.exit()
664
if not noclose:
665
# Close all standard open file descriptors
666
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
667
if not stat.S_ISCHR(os.fstat(null).st_mode):
668
raise OSError(errno.ENODEV,
669
"/dev/null not a character device")
670
os.dup2(null, sys.stdin.fileno())
671
os.dup2(null, sys.stdout.fileno())
672
os.dup2(null, sys.stderr.fileno())
673
if null > 2:
674
os.close(null)
675
676
677
def main():
678
global main_loop_started
679
main_loop_started = False
680
681
parser = OptionParser(version = "%%prog %s" % version)
527
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
528
s = socket.socket()
529
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
530
struct.pack("16s16x", interface))
531
s.close()
532
interface_index = struct.unpack("I", ifreq[16:20])[0]
533
return interface_index
534
535
536
if __name__ == '__main__':
537
parser = OptionParser()
682
538
parser.add_option("-i", "--interface", type="string",
683
metavar="IF", help="Bind to interface IF")
684
parser.add_option("-a", "--address", type="string",
685
help="Address to listen for requests on")
686
parser.add_option("-p", "--port", type="int",
539
default=None, metavar="IF",
540
help="Bind to interface IF")
541
parser.add_option("--cert", type="string", default="cert.pem",
542
metavar="FILE",
543
help="Public key certificate PEM file to use")
544
parser.add_option("--key", type="string", default="key.pem",
545
metavar="FILE",
546
help="Private key PEM file to use")
547
parser.add_option("--ca", type="string", default="ca.pem",
548
metavar="FILE",
549
help="Certificate Authority certificate PEM file to use")
550
parser.add_option("--crl", type="string", default="crl.pem",
551
metavar="FILE",
552
help="Certificate Revokation List PEM file to use")
553
parser.add_option("-p", "--port", type="int", default=None,
687
554
help="Port number to receive requests on")
555
parser.add_option("--timeout", type="string", # Parsed later
556
default="1h",
557
help="Amount of downtime allowed for clients")
558
parser.add_option("--interval", type="string", # Parsed later
559
default="5m",
560
help="How often to check that a client is up")
688
561
parser.add_option("--check", action="store_true", default=False,
689
562
help="Run self-test")
690
parser.add_option("--debug", action="store_true",
691
help="Debug mode; run in foreground and log to"
692
" terminal")
693
parser.add_option("--priority", type="string", help="GnuTLS"
694
" priority string (see GnuTLS documentation)")
695
parser.add_option("--servicename", type="string", metavar="NAME",
696
help="Zeroconf service name")
697
parser.add_option("--configdir", type="string",
698
default="/etc/mandos", metavar="DIR",
699
help="Directory to search for configuration"
700
" files")
563
parser.add_option("--debug", action="store_true", default=False,
564
help="Debug mode")
701
565
(options, args) = parser.parse_args()
702
566
703
567
if options.check:
705
569
doctest.testmod()
706
570
sys.exit()
707
571
708
# Default values for config file for server-global settings
709
server_defaults = { "interface": "",
710
"address": "",
711
"port": "",
712
"debug": "False",
713
"priority":
714
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
715
"servicename": "Mandos",
716
}
717
718
# Parse config file for server-global settings
719
server_config = ConfigParser.SafeConfigParser(server_defaults)
720
del server_defaults
721
server_config.read(os.path.join(options.configdir, "mandos.conf"))
722
# Convert the SafeConfigParser object to a dict
723
server_settings = server_config.defaults()
724
# Use getboolean on the boolean config option
725
server_settings["debug"] = server_config.getboolean\
726
("DEFAULT", "debug")
727
del server_config
728
729
# Override the settings from the config file with command line
730
# options, if set.
731
for option in ("interface", "address", "port", "debug",
732
"priority", "servicename", "configdir"):
733
value = getattr(options, option)
734
if value is not None:
735
server_settings[option] = value
736
del options
737
# Now we have our good server settings in "server_settings"
738
739
debug = server_settings["debug"]
740
741
if not debug:
742
syslogger.setLevel(logging.WARNING)
743
console.setLevel(logging.WARNING)
744
745
if server_settings["servicename"] != "Mandos":
746
syslogger.setFormatter(logging.Formatter\
747
('Mandos (%s): %%(levelname)s:'
748
' %%(message)s'
749
% server_settings["servicename"]))
750
751
# Parse config file with clients
752
client_defaults = { "timeout": "1h",
753
"interval": "5m",
754
"checker": "fping -q -- %(host)s",
755
"host": "",
756
}
757
client_config = ConfigParser.SafeConfigParser(client_defaults)
758
client_config.read(os.path.join(server_settings["configdir"],
759
"clients.conf"))
760
761
global service
762
service = AvahiService(name = server_settings["servicename"],
763
type = "_mandos._tcp", );
764
if server_settings["interface"]:
765
service.interface = if_nametoindex(server_settings["interface"])
766
767
global main_loop
768
global bus
769
global server
770
# From the Avahi example code
572
# Parse the time arguments
573
try:
574
options.timeout = string_to_delta(options.timeout)
575
except ValueError:
576
parser.error("option --timeout: Unparseable time")
577
try:
578
options.interval = string_to_delta(options.interval)
579
except ValueError:
580
parser.error("option --interval: Unparseable time")
581
582
# Parse config file
583
defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
584
client_config = ConfigParser.SafeConfigParser(defaults)
585
#client_config.readfp(open("secrets.conf"), "secrets.conf")
586
client_config.read("mandos-clients.conf")
587
588
# From the Avahi server example code
771
589
DBusGMainLoop(set_as_default=True )
772
590
main_loop = gobject.MainLoop()
773
591
bus = dbus.SystemBus()
776
594
avahi.DBUS_INTERFACE_SERVER )
777
595
# End of Avahi example code
778
596
597
debug = options.debug
598
779
599
clients = Set()
780
600
def remove_from_clients(client):
781
601
clients.remove(client)
782
602
if not clients:
783
logger.critical(u"No clients left, exiting")
784
sys.exit()
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
785
605
786
clients.update(Set(Client(name = section,
606
clients.update(Set(Client(name=section, options=options,
787
607
stop_hook = remove_from_clients,
788
config
789
= dict(client_config.items(section)))
608
**(dict(client_config\
609
.items(section))))
790
610
for section in client_config.sections()))
791
if not clients:
792
logger.critical(u"No clients defined")
793
sys.exit(1)
794
795
if debug:
796
# Redirect stdin so all checkers get /dev/null
797
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
798
os.dup2(null, sys.stdin.fileno())
799
if null > 2:
800
os.close(null)
801
else:
802
# No console logging
803
logger.removeHandler(console)
804
# Close all input and output, do double fork, etc.
805
daemon()
806
807
pidfilename = "/var/run/mandos/mandos.pid"
808
pid = os.getpid()
809
try:
810
pidfile = open(pidfilename, "w")
811
pidfile.write(str(pid) + "\n")
812
pidfile.close()
813
del pidfile
814
except IOError, err:
815
logger.error(u"Could not write %s file with PID %d",
816
pidfilename, os.getpid())
817
818
def cleanup():
819
"Cleanup function; run on exit"
820
global group
821
# From the Avahi example code
822
if not group is None:
823
group.Free()
824
group = None
825
# End of Avahi example code
826
827
while clients:
828
client = clients.pop()
829
client.stop_hook = None
830
client.stop()
831
832
atexit.register(cleanup)
833
834
if not debug:
835
signal.signal(signal.SIGINT, signal.SIG_IGN)
836
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
837
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
838
839
611
for client in clients:
840
612
client.start()
841
613
842
tcp_server = IPv6_TCPServer((server_settings["address"],
843
server_settings["port"]),
614
tcp_server = IPv6_TCPServer((None, options.port),
844
615
tcp_handler,
845
settings=server_settings,
616
options=options,
846
617
clients=clients)
847
# Find out what port we got
848
service.port = tcp_server.socket.getsockname()[1]
849
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
850
u" scope_id %d" % tcp_server.socket.getsockname())
851
852
#service.interface = tcp_server.socket.getsockname()[3]
853
618
# Find out what random port we got
619
servicePort = tcp_server.socket.getsockname()[1]
620
logger.debug(u"Now listening on port %d", servicePort)
621
622
if options.interface is not None:
623
serviceInterface = if_nametoindex(options.interface)
624
625
# From the Avahi server example code
626
server.connect_to_signal("StateChanged", server_state_changed)
627
server_state_changed(server.GetState())
628
# End of Avahi example code
629
630
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
631
lambda *args, **kwargs:
632
tcp_server.handle_request(*args[2:],
633
**kwargs) or True)
854
634
try:
855
# From the Avahi example code
856
server.connect_to_signal("StateChanged", server_state_changed)
857
try:
858
server_state_changed(server.GetState())
859
except dbus.exceptions.DBusException, error:
860
logger.critical(u"DBusException: %s", error)
861
sys.exit(1)
862
# End of Avahi example code
863
864
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
865
lambda *args, **kwargs:
866
tcp_server.handle_request\
867
(*args[2:], **kwargs) or True)
868
869
logger.debug(u"Starting main loop")
870
main_loop_started = True
871
635
main_loop.run()
872
except AvahiError, error:
873
logger.critical(u"AvahiError: %s" + unicode(error))
874
sys.exit(1)
875
636
except KeyboardInterrupt:
876
if debug:
877
print
637
print
638
639
# Cleanup here
878
640
879
if __name__ == '__main__':
880
main()
641
# From the Avahi server example code
642
if not group is None:
643
group.Free()
644
# End of Avahi example code
645
646
for client in clients:
647
client.stop_hook = None
648
client.stop()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0