To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to server.py
- browse files at revision 13
- compare with another revision
- download diff
- download tarball
- view history from revision 13
- 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
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
419
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)
420
289
# New buffer for the fingerprint
421
290
buffer = ctypes.create_string_buffer(20)
422
291
buffer_length = ctypes.c_size_t()
438
307
Note: This will run in its own forked process."""
439
308
440
309
def handle(self):
441
logger.info(u"TCP connection from: %s",
310
logger.debug(u"TCP connection from: %s",
442
311
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.
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
459
315
460
316
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
461
317
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
462
318
# "+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"]
319
priority = "SECURE256"
320
467
321
gnutls.library.functions.gnutls_priority_set_direct\
468
322
(session._c_object, priority, None);
469
323
470
324
try:
471
325
session.handshake()
472
326
except gnutls.errors.GNUTLSError, error:
473
logger.warning(u"Handshake failed: %s", error)
327
logger.debug(u"Handshake failed: %s", error)
474
328
# Do not run session.bye() here: the session is not
475
329
# established. Just abandon the request.
476
330
return
477
331
try:
478
332
fpr = fingerprint(peer_certificate(session))
479
333
except (TypeError, gnutls.errors.GNUTLSError), error:
480
logger.warning(u"Bad certificate: %s", error)
334
logger.debug(u"Bad certificate: %s", error)
481
335
session.bye()
482
336
return
483
337
logger.debug(u"Fingerprint: %s", fpr)
484
338
client = None
485
for c in self.server.clients:
339
for c in clients:
486
340
if c.fingerprint == fpr:
487
341
client = c
488
342
break
489
if not client:
490
logger.warning(u"Client not found for fingerprint: %s",
491
fpr)
492
session.bye()
493
return
494
343
# Have to check if client.still_valid(), since it is possible
495
344
# that the client timed out while establishing the GnuTLS
496
345
# session.
497
if not client.still_valid():
498
logger.warning(u"Client %(name)s is invalid",
499
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)
500
353
session.bye()
501
354
return
502
355
sent_size = 0
512
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
513
366
"""IPv6 TCP server. Accepts 'None' as address and/or port.
514
367
Attributes:
515
settings: Server settings
368
options: Command line options
516
369
clients: Set() of Client objects
517
370
"""
518
371
address_family = socket.AF_INET6
519
372
def __init__(self, *args, **kwargs):
520
if "settings" in kwargs:
521
self.settings = kwargs["settings"]
522
del kwargs["settings"]
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
523
376
if "clients" in kwargs:
524
377
self.clients = kwargs["clients"]
525
378
del kwargs["clients"]
528
381
"""This overrides the normal server_bind() function
529
382
to bind to an interface if one was specified, and also NOT to
530
383
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)
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
534
388
try:
535
389
self.socket.setsockopt(socket.SOL_SOCKET,
536
SO_BINDTODEVICE,
537
self.settings["interface"])
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
538
392
except socket.error, error:
539
393
if error[0] == errno.EPERM:
540
logger.error(u"No permission to"
541
u" bind to interface %s",
542
self.settings["interface"])
394
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
543
397
else:
544
398
raise error
545
399
# Only bind(2) the socket if we really need to.
548
402
in6addr_any = "::"
549
403
self.server_address = (in6addr_any,
550
404
self.server_address[1])
551
elif not self.server_address[1]:
405
elif self.server_address[1] is None:
552
406
self.server_address = (self.server_address[0],
553
407
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
408
return super(type(self), self).server_bind()
562
409
563
410
574
421
datetime.timedelta(1)
575
422
>>> string_to_delta(u'1w')
576
423
datetime.timedelta(7)
577
>>> string_to_delta('5m 30s')
578
datetime.timedelta(0, 330)
579
424
"""
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):
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:
598
439
raise ValueError
599
timevalue += delta
600
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()
601
476
602
477
603
478
def server_state_changed(state):
604
"""Derived from the Avahi example code"""
479
"""From the Avahi server example code"""
605
480
if state == avahi.SERVER_COLLISION:
606
logger.error(u"Server name collision")
607
service.remove()
481
logger.warning(u"Server name collision")
482
remove_service()
608
483
elif state == avahi.SERVER_RUNNING:
609
service.add()
484
add_service()
610
485
611
486
612
487
def entry_group_state_changed(state, error):
613
"""Derived from the Avahi example code"""
488
"""From the Avahi server example code"""
489
global serviceName, server, rename_count
490
614
491
logger.debug(u"state change: %i", state)
615
492
616
493
if state == avahi.ENTRY_GROUP_ESTABLISHED:
617
494
logger.debug(u"Service established.")
618
495
elif state == avahi.ENTRY_GROUP_COLLISION:
619
logger.warning(u"Service name collision.")
620
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()
621
510
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))
511
logger.error(u"Error in group state changed %s",
512
unicode(error))
513
main_loop.quit()
514
return
515
625
516
626
517
def if_nametoindex(interface):
627
"""Call the C function if_nametoindex(), or equivalent"""
628
global if_nametoindex
518
"""Call the C function if_nametoindex()"""
629
519
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
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
return libc.if_nametoindex(interface)
634
522
except (OSError, AttributeError):
635
523
if "struct" not in sys.modules:
636
524
import struct
637
525
if "fcntl" not in sys.modules:
638
526
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):
652
"""See daemon(3). Standard BSD Unix function.
653
This should really exist as os.daemon, but it doesn't (yet)."""
654
if os.fork():
655
sys.exit()
656
os.setsid()
657
if not nochdir:
658
os.chdir("/")
659
if os.fork():
660
sys.exit()
661
if not noclose:
662
# Close all standard open file descriptors
663
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
664
if not stat.S_ISCHR(os.fstat(null).st_mode):
665
raise OSError(errno.ENODEV,
666
"/dev/null not a character device")
667
os.dup2(null, sys.stdin.fileno())
668
os.dup2(null, sys.stdout.fileno())
669
os.dup2(null, sys.stderr.fileno())
670
if null > 2:
671
os.close(null)
672
673
674
def main():
675
global main_loop_started
676
main_loop_started = False
677
678
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()
679
538
parser.add_option("-i", "--interface", type="string",
680
metavar="IF", help="Bind to interface IF")
681
parser.add_option("-a", "--address", type="string",
682
help="Address to listen for requests on")
683
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,
684
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")
685
561
parser.add_option("--check", action="store_true", default=False,
686
562
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")
563
parser.add_option("--debug", action="store_true", default=False,
564
help="Debug mode")
698
565
(options, args) = parser.parse_args()
699
566
700
567
if options.check:
702
569
doctest.testmod()
703
570
sys.exit()
704
571
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"])
763
764
global main_loop
765
global bus
766
global server
767
# 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
768
589
DBusGMainLoop(set_as_default=True )
769
590
main_loop = gobject.MainLoop()
770
591
bus = dbus.SystemBus()
773
594
avahi.DBUS_INTERFACE_SERVER )
774
595
# End of Avahi example code
775
596
597
debug = options.debug
598
776
599
clients = Set()
777
600
def remove_from_clients(client):
778
601
clients.remove(client)
779
602
if not clients:
780
logger.critical(u"No clients left, exiting")
781
sys.exit()
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
782
605
783
clients.update(Set(Client(name = section,
606
clients.update(Set(Client(name=section, options=options,
784
607
stop_hook = remove_from_clients,
785
config
786
= dict(client_config.items(section)))
608
**(dict(client_config\
609
.items(section))))
787
610
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())
814
815
def cleanup():
816
"Cleanup function; run on exit"
817
global group
818
# From the Avahi example code
819
if not group is None:
820
group.Free()
821
group = None
822
# End of Avahi example code
823
824
while clients:
825
client = clients.pop()
826
client.stop_hook = None
827
client.stop()
828
829
atexit.register(cleanup)
830
831
if not debug:
832
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())
835
836
611
for client in clients:
837
612
client.start()
838
613
839
tcp_server = IPv6_TCPServer((server_settings["address"],
840
server_settings["port"]),
614
tcp_server = IPv6_TCPServer((None, options.port),
841
615
tcp_handler,
842
settings=server_settings,
616
options=options,
843
617
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
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)
851
634
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")
867
main_loop_started = True
868
635
main_loop.run()
869
except AvahiError, error:
870
logger.critical(u"AvahiError: %s" + unicode(error))
871
sys.exit(1)
872
636
except KeyboardInterrupt:
873
if debug:
874
print
637
print
638
639
# Cleanup here
875
640
876
if __name__ == '__main__':
877
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