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- Committer: Teddy Hogeborn
- Date: 2008-09-13 15:36:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080913153618-atp386q2bqj0ku99
* Makefile (install-client-nokey): Do "&&" instead of ";" to catch
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
errors.
* README: Kill the straight quotes. Add copyright notice.
* overview.xml: Improved wording.
- files added:
- .bzrignore
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
mandos
1
1
#!/usr/bin/python
2
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
28
# <http://www.gnu.org/licenses/>.
29
#
30
# Contact the authors at <mandos@fukt.bsnet.se>.
31
#
3
32
4
33
from __future__ import division
5
34
24
53
import subprocess
25
54
import atexit
26
55
import stat
56
import logging
57
import logging.handlers
58
import pwd
27
59
28
60
import dbus
29
61
import gobject
31
63
from dbus.mainloop.glib import DBusGMainLoop
32
64
import ctypes
33
65
34
import logging
35
import logging.handlers
66
version = "1.0"
36
67
37
68
logger = logging.Logger('mandos')
38
69
syslogger = logging.handlers.SysLogHandler\
39
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
70
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
address = "/dev/log")
40
72
syslogger.setFormatter(logging.Formatter\
41
('%(levelname)s: %(message)s'))
73
('Mandos: %(levelname)s: %(message)s'))
42
74
logger.addHandler(syslogger)
43
del syslogger
44
45
# This variable is used to optionally bind to a specified interface.
46
# It is a global variable to fit in with the other variables from the
47
# Avahi server example code.
48
serviceInterface = avahi.IF_UNSPEC
49
# From the Avahi server example code:
50
serviceName = "Mandos"
51
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
52
servicePort = None # Not known at startup
53
serviceTXT = [] # TXT record for the service
54
domain = "" # Domain to publish on, default to .local
55
host = "" # Host to publish records for, default to localhost
56
group = None #our entry group
57
rename_count = 12 # Counter so we only rename after collisions a
58
# sensible number of times
75
76
console = logging.StreamHandler()
77
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
' %(message)s'))
79
logger.addHandler(console)
80
81
class AvahiError(Exception):
82
def __init__(self, value):
83
self.value = value
84
def __str__(self):
85
return repr(self.value)
86
87
class AvahiServiceError(AvahiError):
88
pass
89
90
class AvahiGroupError(AvahiError):
91
pass
92
93
94
class AvahiService(object):
95
"""An Avahi (Zeroconf) service.
96
Attributes:
97
interface: integer; avahi.IF_UNSPEC or an interface index.
98
Used to optionally bind to the specified interface.
99
name: string; Example: 'Mandos'
100
type: string; Example: '_mandos._tcp'.
101
See <http://www.dns-sd.org/ServiceTypes.html>
102
port: integer; what port to announce
103
TXT: list of strings; TXT record for the service
104
domain: string; Domain to publish on, default to .local if empty.
105
host: string; Host to publish records for, default is localhost
106
max_renames: integer; maximum number of renames
107
rename_count: integer; counter so we only rename after collisions
108
a sensible number of times
109
"""
110
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
111
type = None, port = None, TXT = None, domain = "",
112
host = "", max_renames = 32768):
113
self.interface = interface
114
self.name = name
115
self.type = type
116
self.port = port
117
if TXT is None:
118
self.TXT = []
119
else:
120
self.TXT = TXT
121
self.domain = domain
122
self.host = host
123
self.rename_count = 0
124
self.max_renames = max_renames
125
def rename(self):
126
"""Derived from the Avahi example code"""
127
if self.rename_count >= self.max_renames:
128
logger.critical(u"No suitable Zeroconf service name found"
129
u" after %i retries, exiting.",
130
rename_count)
131
raise AvahiServiceError("Too many renames")
132
self.name = server.GetAlternativeServiceName(self.name)
133
logger.info(u"Changing Zeroconf service name to %r ...",
134
str(self.name))
135
syslogger.setFormatter(logging.Formatter\
136
('Mandos (%s): %%(levelname)s:'
137
' %%(message)s' % self.name))
138
self.remove()
139
self.add()
140
self.rename_count += 1
141
def remove(self):
142
"""Derived from the Avahi example code"""
143
if group is not None:
144
group.Reset()
145
def add(self):
146
"""Derived from the Avahi example code"""
147
global group
148
if group is None:
149
group = dbus.Interface\
150
(bus.get_object(avahi.DBUS_NAME,
151
server.EntryGroupNew()),
152
avahi.DBUS_INTERFACE_ENTRY_GROUP)
153
group.connect_to_signal('StateChanged',
154
entry_group_state_changed)
155
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
156
service.name, service.type)
157
group.AddService(
158
self.interface, # interface
159
avahi.PROTO_INET6, # protocol
160
dbus.UInt32(0), # flags
161
self.name, self.type,
162
self.domain, self.host,
163
dbus.UInt16(self.port),
164
avahi.string_array_to_txt_array(self.TXT))
165
group.Commit()
166
167
# From the Avahi example code:
168
group = None # our entry group
59
169
# End of Avahi example code
60
170
61
171
66
176
fingerprint: string (40 or 32 hexadecimal digits); used to
67
177
uniquely identify the client
68
178
secret: bytestring; sent verbatim (over TLS) to client
69
fqdn: string (FQDN); available for use by the checker command
70
created: datetime.datetime()
71
last_seen: datetime.datetime() or None if not yet seen
72
timeout: datetime.timedelta(); How long from last_seen until
73
this client is invalid
179
host: string; available for use by the checker command
180
created: datetime.datetime(); object creation, not client host
181
last_checked_ok: datetime.datetime() or None if not yet checked OK
182
timeout: datetime.timedelta(); How long from last_checked_ok
183
until this client is invalid
74
184
interval: datetime.timedelta(); How often to start a new checker
75
185
stop_hook: If set, called by stop() as stop_hook(self)
76
186
checker: subprocess.Popen(); a running checker process used
77
187
to see if the client lives.
78
Is None if no process is running.
188
'None' if no process is running.
79
189
checker_initiator_tag: a gobject event source tag, or None
80
190
stop_initiator_tag: - '' -
81
191
checker_callback_tag: - '' -
82
192
checker_command: string; External command which is run to check if
83
client lives. %()s expansions are done at
193
client lives. %() expansions are done at
84
194
runtime with vars(self) as dict, so that for
85
195
instance %(name)s can be used in the command.
86
196
Private attibutes:
87
197
_timeout: Real variable for 'timeout'
88
198
_interval: Real variable for 'interval'
89
_timeout_milliseconds: Used by gobject.timeout_add()
199
_timeout_milliseconds: Used when calling gobject.timeout_add()
90
200
_interval_milliseconds: - '' -
91
201
"""
92
202
def _set_timeout(self, timeout):
112
222
interval = property(lambda self: self._interval,
113
223
_set_interval)
114
224
del _set_interval
115
def __init__(self, name=None, options=None, stop_hook=None,
116
fingerprint=None, secret=None, secfile=None,
117
fqdn=None, timeout=None, interval=-1, checker=None):
225
def __init__(self, name = None, stop_hook=None, config={}):
226
"""Note: the 'checker' key in 'config' sets the
227
'checker_command' attribute and *not* the 'checker'
228
attribute."""
118
229
self.name = name
119
# Uppercase and remove spaces from fingerprint
120
# for later comparison purposes with return value of
121
# the fingerprint() function
122
self.fingerprint = fingerprint.upper().replace(u" ", u"")
123
if secret:
124
self.secret = secret.decode(u"base64")
125
elif secfile:
126
sf = open(secfile)
230
logger.debug(u"Creating client %r", self.name)
231
# Uppercase and remove spaces from fingerprint for later
232
# comparison purposes with return value from the fingerprint()
233
# function
234
self.fingerprint = config["fingerprint"].upper()\
235
.replace(u" ", u"")
236
logger.debug(u" Fingerprint: %s", self.fingerprint)
237
if "secret" in config:
238
self.secret = config["secret"].decode(u"base64")
239
elif "secfile" in config:
240
sf = open(config["secfile"])
127
241
self.secret = sf.read()
128
242
sf.close()
129
243
else:
130
raise RuntimeError(u"No secret or secfile for client %s"
131
% self.name)
132
self.fqdn = fqdn # string
244
raise TypeError(u"No secret or secfile for client %s"
245
% self.name)
246
self.host = config.get("host", "")
133
247
self.created = datetime.datetime.now()
134
self.last_seen = None
135
if timeout is None:
136
self.timeout = options.timeout
137
else:
138
self.timeout = string_to_delta(timeout)
139
if interval == -1:
140
self.interval = options.interval
141
else:
142
self.interval = string_to_delta(interval)
248
self.last_checked_ok = None
249
self.timeout = string_to_delta(config["timeout"])
250
self.interval = string_to_delta(config["interval"])
143
251
self.stop_hook = stop_hook
144
252
self.checker = None
145
253
self.checker_initiator_tag = None
146
254
self.stop_initiator_tag = None
147
255
self.checker_callback_tag = None
148
self.check_command = checker
256
self.check_command = config["checker"]
149
257
def start(self):
150
"""Start this clients checker and timeout hooks"""
258
"""Start this client's checker and timeout hooks"""
151
259
# Schedule a new checker to be started an 'interval' from now,
152
260
# and every interval from then on.
153
261
self.checker_initiator_tag = gobject.timeout_add\
161
269
self.stop)
162
270
def stop(self):
163
271
"""Stop this client.
164
The possibility that this client might be restarted is left
165
open, but not currently used."""
166
logger.debug(u"Stopping client %s", self.name)
167
self.secret = None
168
if self.stop_initiator_tag:
272
The possibility that a client might be restarted is left open,
273
but not currently used."""
274
# If this client doesn't have a secret, it is already stopped.
275
if hasattr(self, "secret") and self.secret:
276
logger.info(u"Stopping client %s", self.name)
277
self.secret = None
278
else:
279
return False
280
if getattr(self, "stop_initiator_tag", False):
169
281
gobject.source_remove(self.stop_initiator_tag)
170
282
self.stop_initiator_tag = None
171
if self.checker_initiator_tag:
283
if getattr(self, "checker_initiator_tag", False):
172
284
gobject.source_remove(self.checker_initiator_tag)
173
285
self.checker_initiator_tag = None
174
286
self.stop_checker()
177
289
# Do not run this again if called by a gobject.timeout_add
178
290
return False
179
291
def __del__(self):
180
# Some code duplication here and in stop()
181
if hasattr(self, "stop_initiator_tag") \
182
and self.stop_initiator_tag:
183
gobject.source_remove(self.stop_initiator_tag)
184
self.stop_initiator_tag = None
185
if hasattr(self, "checker_initiator_tag") \
186
and self.checker_initiator_tag:
187
gobject.source_remove(self.checker_initiator_tag)
188
self.checker_initiator_tag = None
189
self.stop_checker()
292
self.stop_hook = None
293
self.stop()
190
294
def checker_callback(self, pid, condition):
191
295
"""The checker has completed, so take appropriate actions."""
192
296
now = datetime.datetime.now()
297
self.checker_callback_tag = None
298
self.checker = None
193
299
if os.WIFEXITED(condition) \
194
300
and (os.WEXITSTATUS(condition) == 0):
195
logger.debug(u"Checker for %(name)s succeeded",
196
vars(self))
197
self.last_seen = now
301
logger.info(u"Checker for %(name)s succeeded",
302
vars(self))
303
self.last_checked_ok = now
198
304
gobject.source_remove(self.stop_initiator_tag)
199
305
self.stop_initiator_tag = gobject.timeout_add\
200
306
(self._timeout_milliseconds,
203
309
logger.warning(u"Checker for %(name)s crashed?",
204
310
vars(self))
205
311
else:
206
logger.debug(u"Checker for %(name)s failed",
207
vars(self))
208
self.checker = None
209
self.checker_callback_tag = None
312
logger.info(u"Checker for %(name)s failed",
313
vars(self))
210
314
def start_checker(self):
211
315
"""Start a new checker subprocess if one is not running.
212
316
If a checker already exists, leave it running and do
213
317
nothing."""
318
# The reason for not killing a running checker is that if we
319
# did that, then if a checker (for some reason) started
320
# running slowly and taking more than 'interval' time, the
321
# client would inevitably timeout, since no checker would get
322
# a chance to run to completion. If we instead leave running
323
# checkers alone, the checker would have to take more time
324
# than 'timeout' for the client to be declared invalid, which
325
# is as it should be.
214
326
if self.checker is None:
215
327
try:
216
command = self.check_command % self.fqdn
328
# In case check_command has exactly one % operator
329
command = self.check_command % self.host
217
330
except TypeError:
331
# Escape attributes for the shell
218
332
escaped_attrs = dict((key, re.escape(str(val)))
219
333
for key, val in
220
334
vars(self).iteritems())
221
335
try:
222
336
command = self.check_command % escaped_attrs
223
337
except TypeError, error:
224
logger.critical(u'Could not format string "%s":'
225
u' %s', self.check_command, error)
338
logger.error(u'Could not format string "%s":'
339
u' %s', self.check_command, error)
226
340
return True # Try again later
227
341
try:
228
logger.debug(u"Starting checker %r for %s",
229
command, self.name)
230
self.checker = subprocess.\
231
Popen(command,
232
close_fds=True, shell=True,
233
cwd="/")
342
logger.info(u"Starting checker %r for %s",
343
command, self.name)
344
# We don't need to redirect stdout and stderr, since
345
# in normal mode, that is already done by daemon(),
346
# and in debug mode we don't want to. (Stdin is
347
# always replaced by /dev/null.)
348
self.checker = subprocess.Popen(command,
349
close_fds=True,
350
shell=True, cwd="/")
234
351
self.checker_callback_tag = gobject.child_watch_add\
235
352
(self.checker.pid,
236
353
self.checker_callback)
237
except subprocess.OSError, error:
354
except OSError, error:
238
355
logger.error(u"Failed to start subprocess: %s",
239
356
error)
240
357
# Re-run this periodically if run by gobject.timeout_add
241
358
return True
242
359
def stop_checker(self):
243
360
"""Force the checker process, if any, to stop."""
244
if not hasattr(self, "checker") or self.checker is None:
361
if self.checker_callback_tag:
362
gobject.source_remove(self.checker_callback_tag)
363
self.checker_callback_tag = None
364
if getattr(self, "checker", None) is None:
245
365
return
246
gobject.source_remove(self.checker_callback_tag)
247
self.checker_callback_tag = None
248
os.kill(self.checker.pid, signal.SIGTERM)
249
if self.checker.poll() is None:
250
os.kill(self.checker.pid, signal.SIGKILL)
366
logger.debug(u"Stopping checker for %(name)s", vars(self))
367
try:
368
os.kill(self.checker.pid, signal.SIGTERM)
369
#os.sleep(0.5)
370
#if self.checker.poll() is None:
371
# os.kill(self.checker.pid, signal.SIGKILL)
372
except OSError, error:
373
if error.errno != errno.ESRCH: # No such process
374
raise
251
375
self.checker = None
252
def still_valid(self, now=None):
376
def still_valid(self):
253
377
"""Has the timeout not yet passed for this client?"""
254
if now is None:
255
now = datetime.datetime.now()
256
if self.last_seen is None:
378
now = datetime.datetime.now()
379
if self.last_checked_ok is None:
257
380
return now < (self.created + self.timeout)
258
381
else:
259
return now < (self.last_seen + self.timeout)
382
return now < (self.last_checked_ok + self.timeout)
260
383
261
384
262
385
def peer_certificate(session):
263
"Return an OpenPGP data packet string for the peer's certificate"
386
"Return the peer's OpenPGP certificate as a bytestring"
264
387
# If not an OpenPGP certificate...
265
388
if gnutls.library.functions.gnutls_certificate_type_get\
266
389
(session._c_object) \
277
400
278
401
279
402
def fingerprint(openpgp):
280
"Convert an OpenPGP data string to a hexdigit fingerprint string"
281
# New empty GnuTLS certificate
282
crt = gnutls.library.types.gnutls_openpgp_crt_t()
283
gnutls.library.functions.gnutls_openpgp_crt_init\
284
(ctypes.byref(crt))
403
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
285
404
# New GnuTLS "datum" with the OpenPGP public key
286
405
datum = gnutls.library.types.gnutls_datum_t\
287
406
(ctypes.cast(ctypes.c_char_p(openpgp),
288
407
ctypes.POINTER(ctypes.c_ubyte)),
289
408
ctypes.c_uint(len(openpgp)))
409
# New empty GnuTLS certificate
410
crt = gnutls.library.types.gnutls_openpgp_crt_t()
411
gnutls.library.functions.gnutls_openpgp_crt_init\
412
(ctypes.byref(crt))
290
413
# Import the OpenPGP public key into the certificate
291
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
292
(crt,
293
ctypes.byref(datum),
294
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
414
gnutls.library.functions.gnutls_openpgp_crt_import\
415
(crt, ctypes.byref(datum),
416
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
417
# Verify the self signature in the key
418
crtverify = ctypes.c_uint();
419
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
420
(crt, 0, ctypes.byref(crtverify))
421
if crtverify.value != 0:
422
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
423
raise gnutls.errors.CertificateSecurityError("Verify failed")
295
424
# New buffer for the fingerprint
296
425
buffer = ctypes.create_string_buffer(20)
297
426
buffer_length = ctypes.c_size_t()
313
442
Note: This will run in its own forked process."""
314
443
315
444
def handle(self):
316
logger.debug(u"TCP connection from: %s",
445
logger.info(u"TCP connection from: %s",
317
446
unicode(self.client_address))
318
session = gnutls.connection.ClientSession(self.request,
319
gnutls.connection.\
320
X509Credentials())
447
session = gnutls.connection.ClientSession\
448
(self.request, gnutls.connection.X509Credentials())
449
450
line = self.request.makefile().readline()
451
logger.debug(u"Protocol version: %r", line)
452
try:
453
if int(line.strip().split()[0]) > 1:
454
raise RuntimeError
455
except (ValueError, IndexError, RuntimeError), error:
456
logger.error(u"Unknown protocol version: %s", error)
457
return
458
459
# Note: gnutls.connection.X509Credentials is really a generic
460
# GnuTLS certificate credentials object so long as no X.509
461
# keys are added to it. Therefore, we can use it here despite
462
# using OpenPGP certificates.
321
463
322
464
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
323
465
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
324
466
# "+DHE-DSS"))
325
priority = "SECURE256"
326
467
priority = "NORMAL" # Fallback default, since this
468
# MUST be set.
469
if self.server.settings["priority"]:
470
priority = self.server.settings["priority"]
327
471
gnutls.library.functions.gnutls_priority_set_direct\
328
472
(session._c_object, priority, None);
329
473
330
474
try:
331
475
session.handshake()
332
476
except gnutls.errors.GNUTLSError, error:
333
logger.debug(u"Handshake failed: %s", error)
477
logger.warning(u"Handshake failed: %s", error)
334
478
# Do not run session.bye() here: the session is not
335
479
# established. Just abandon the request.
336
480
return
337
481
try:
338
482
fpr = fingerprint(peer_certificate(session))
339
483
except (TypeError, gnutls.errors.GNUTLSError), error:
340
logger.debug(u"Bad certificate: %s", error)
484
logger.warning(u"Bad certificate: %s", error)
341
485
session.bye()
342
486
return
343
487
logger.debug(u"Fingerprint: %s", fpr)
344
488
client = None
345
for c in clients:
489
for c in self.server.clients:
346
490
if c.fingerprint == fpr:
347
491
client = c
348
492
break
493
if not client:
494
logger.warning(u"Client not found for fingerprint: %s",
495
fpr)
496
session.bye()
497
return
349
498
# Have to check if client.still_valid(), since it is possible
350
499
# that the client timed out while establishing the GnuTLS
351
500
# session.
352
if (not client) or (not client.still_valid()):
353
if client:
354
logger.debug(u"Client %(name)s is invalid",
355
vars(client))
356
else:
357
logger.debug(u"Client not found for fingerprint: %s",
358
fpr)
501
if not client.still_valid():
502
logger.warning(u"Client %(name)s is invalid",
503
vars(client))
359
504
session.bye()
360
505
return
361
506
sent_size = 0
371
516
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
372
517
"""IPv6 TCP server. Accepts 'None' as address and/or port.
373
518
Attributes:
374
options: Command line options
519
settings: Server settings
375
520
clients: Set() of Client objects
521
enabled: Boolean; whether this server is activated yet
376
522
"""
377
523
address_family = socket.AF_INET6
378
524
def __init__(self, *args, **kwargs):
379
if "options" in kwargs:
380
self.options = kwargs["options"]
381
del kwargs["options"]
525
if "settings" in kwargs:
526
self.settings = kwargs["settings"]
527
del kwargs["settings"]
382
528
if "clients" in kwargs:
383
529
self.clients = kwargs["clients"]
384
530
del kwargs["clients"]
531
self.enabled = False
385
532
return super(type(self), self).__init__(*args, **kwargs)
386
533
def server_bind(self):
387
534
"""This overrides the normal server_bind() function
388
535
to bind to an interface if one was specified, and also NOT to
389
536
bind to an address or port if they were not specified."""
390
if self.options.interface:
391
if not hasattr(socket, "SO_BINDTODEVICE"):
392
# From /usr/include/asm-i486/socket.h
393
socket.SO_BINDTODEVICE = 25
537
if self.settings["interface"]:
538
# 25 is from /usr/include/asm-i486/socket.h
539
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
394
540
try:
395
541
self.socket.setsockopt(socket.SOL_SOCKET,
396
socket.SO_BINDTODEVICE,
397
self.options.interface)
542
SO_BINDTODEVICE,
543
self.settings["interface"])
398
544
except socket.error, error:
399
545
if error[0] == errno.EPERM:
400
logger.warning(u"No permission to"
401
u" bind to interface %s",
402
self.options.interface)
546
logger.error(u"No permission to"
547
u" bind to interface %s",
548
self.settings["interface"])
403
549
else:
404
550
raise error
405
551
# Only bind(2) the socket if we really need to.
408
554
in6addr_any = "::"
409
555
self.server_address = (in6addr_any,
410
556
self.server_address[1])
411
elif self.server_address[1] is None:
557
elif not self.server_address[1]:
412
558
self.server_address = (self.server_address[0],
413
559
0)
560
# if self.settings["interface"]:
561
# self.server_address = (self.server_address[0],
562
# 0, # port
563
# 0, # flowinfo
564
# if_nametoindex
565
# (self.settings
566
# ["interface"]))
414
567
return super(type(self), self).server_bind()
568
def server_activate(self):
569
if self.enabled:
570
return super(type(self), self).server_activate()
571
def enable(self):
572
self.enabled = True
415
573
416
574
417
575
def string_to_delta(interval):
427
585
datetime.timedelta(1)
428
586
>>> string_to_delta(u'1w')
429
587
datetime.timedelta(7)
588
>>> string_to_delta('5m 30s')
589
datetime.timedelta(0, 330)
430
590
"""
431
try:
432
suffix=unicode(interval[-1])
433
value=int(interval[:-1])
434
if suffix == u"d":
435
delta = datetime.timedelta(value)
436
elif suffix == u"s":
437
delta = datetime.timedelta(0, value)
438
elif suffix == u"m":
439
delta = datetime.timedelta(0, 0, 0, 0, value)
440
elif suffix == u"h":
441
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
442
elif suffix == u"w":
443
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
444
else:
591
timevalue = datetime.timedelta(0)
592
for s in interval.split():
593
try:
594
suffix=unicode(s[-1])
595
value=int(s[:-1])
596
if suffix == u"d":
597
delta = datetime.timedelta(value)
598
elif suffix == u"s":
599
delta = datetime.timedelta(0, value)
600
elif suffix == u"m":
601
delta = datetime.timedelta(0, 0, 0, 0, value)
602
elif suffix == u"h":
603
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
604
elif suffix == u"w":
605
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
606
else:
607
raise ValueError
608
except (ValueError, IndexError):
445
609
raise ValueError
446
except (ValueError, IndexError):
447
raise ValueError
448
return delta
449
450
451
def add_service():
452
"""From the Avahi server example code"""
453
global group, serviceName, serviceType, servicePort, serviceTXT, \
454
domain, host
455
if group is None:
456
group = dbus.Interface(
457
bus.get_object( avahi.DBUS_NAME,
458
server.EntryGroupNew()),
459
avahi.DBUS_INTERFACE_ENTRY_GROUP)
460
group.connect_to_signal('StateChanged',
461
entry_group_state_changed)
462
logger.debug(u"Adding service '%s' of type '%s' ...",
463
serviceName, serviceType)
464
465
group.AddService(
466
serviceInterface, # interface
467
avahi.PROTO_INET6, # protocol
468
dbus.UInt32(0), # flags
469
serviceName, serviceType,
470
domain, host,
471
dbus.UInt16(servicePort),
472
avahi.string_array_to_txt_array(serviceTXT))
473
group.Commit()
474
475
476
def remove_service():
477
"""From the Avahi server example code"""
478
global group
479
480
if not group is None:
481
group.Reset()
610
timevalue += delta
611
return timevalue
482
612
483
613
484
614
def server_state_changed(state):
485
"""From the Avahi server example code"""
615
"""Derived from the Avahi example code"""
486
616
if state == avahi.SERVER_COLLISION:
487
logger.warning(u"Server name collision")
488
remove_service()
617
logger.error(u"Zeroconf server name collision")
618
service.remove()
489
619
elif state == avahi.SERVER_RUNNING:
490
add_service()
620
service.add()
491
621
492
622
493
623
def entry_group_state_changed(state, error):
494
"""From the Avahi server example code"""
495
global serviceName, server, rename_count
496
497
logger.debug(u"state change: %i", state)
624
"""Derived from the Avahi example code"""
625
logger.debug(u"Avahi state change: %i", state)
498
626
499
627
if state == avahi.ENTRY_GROUP_ESTABLISHED:
500
logger.debug(u"Service established.")
628
logger.debug(u"Zeroconf service established.")
501
629
elif state == avahi.ENTRY_GROUP_COLLISION:
502
503
rename_count = rename_count - 1
504
if rename_count > 0:
505
name = server.GetAlternativeServiceName(name)
506
logger.warning(u"Service name collision, "
507
u"changing name to '%s' ...", name)
508
remove_service()
509
add_service()
510
511
else:
512
logger.error(u"No suitable service name found after %i"
513
u" retries, exiting.", n_rename)
514
killme(1)
630
logger.warning(u"Zeroconf service name collision.")
631
service.rename()
515
632
elif state == avahi.ENTRY_GROUP_FAILURE:
516
logger.error(u"Error in group state changed %s",
517
unicode(error))
518
killme(1)
519
633
logger.critical(u"Avahi: Error in group state changed %s",
634
unicode(error))
635
raise AvahiGroupError("State changed: %s", str(error))
520
636
521
637
def if_nametoindex(interface):
522
"""Call the C function if_nametoindex()"""
638
"""Call the C function if_nametoindex(), or equivalent"""
639
global if_nametoindex
523
640
try:
524
libc = ctypes.cdll.LoadLibrary("libc.so.6")
525
return libc.if_nametoindex(interface)
641
if "ctypes.util" not in sys.modules:
642
import ctypes.util
643
if_nametoindex = ctypes.cdll.LoadLibrary\
644
(ctypes.util.find_library("c")).if_nametoindex
526
645
except (OSError, AttributeError):
527
646
if "struct" not in sys.modules:
528
647
import struct
529
648
if "fcntl" not in sys.modules:
530
649
import fcntl
531
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
532
s = socket.socket()
533
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
534
struct.pack("16s16x", interface))
535
s.close()
536
interface_index = struct.unpack("I", ifreq[16:20])[0]
537
return interface_index
538
539
540
def daemon(nochdir, noclose):
650
def if_nametoindex(interface):
651
"Get an interface index the hard way, i.e. using fcntl()"
652
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
653
s = socket.socket()
654
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
655
struct.pack("16s16x", interface))
656
s.close()
657
interface_index = struct.unpack("I", ifreq[16:20])[0]
658
return interface_index
659
return if_nametoindex(interface)
660
661
662
def daemon(nochdir = False, noclose = False):
541
663
"""See daemon(3). Standard BSD Unix function.
542
664
This should really exist as os.daemon, but it doesn't (yet)."""
543
665
if os.fork():
545
667
os.setsid()
546
668
if not nochdir:
547
669
os.chdir("/")
670
if os.fork():
671
sys.exit()
548
672
if not noclose:
549
673
# Close all standard open file descriptors
550
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
674
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
551
675
if not stat.S_ISCHR(os.fstat(null).st_mode):
552
676
raise OSError(errno.ENODEV,
553
677
"/dev/null not a character device")
558
682
os.close(null)
559
683
560
684
561
def killme(status = 0):
562
logger.debug("Stopping server with exit status %d", status)
563
exitstatus = status
564
if main_loop_started:
565
main_loop.quit()
566
else:
567
sys.exit(status)
568
569
570
if __name__ == '__main__':
571
exitstatus = 0
685
def main():
686
global main_loop_started
572
687
main_loop_started = False
573
parser = OptionParser()
688
689
parser = OptionParser(version = "%%prog %s" % version)
574
690
parser.add_option("-i", "--interface", type="string",
575
default=None, metavar="IF",
576
help="Bind to interface IF")
577
parser.add_option("-p", "--port", type="int", default=None,
691
metavar="IF", help="Bind to interface IF")
692
parser.add_option("-a", "--address", type="string",
693
help="Address to listen for requests on")
694
parser.add_option("-p", "--port", type="int",
578
695
help="Port number to receive requests on")
579
parser.add_option("--timeout", type="string", # Parsed later
580
default="1h",
581
help="Amount of downtime allowed for clients")
582
parser.add_option("--interval", type="string", # Parsed later
583
default="5m",
584
help="How often to check that a client is up")
585
696
parser.add_option("--check", action="store_true", default=False,
586
697
help="Run self-test")
587
parser.add_option("--debug", action="store_true", default=False,
588
help="Debug mode")
698
parser.add_option("--debug", action="store_true",
699
help="Debug mode; run in foreground and log to"
700
" terminal")
701
parser.add_option("--priority", type="string", help="GnuTLS"
702
" priority string (see GnuTLS documentation)")
703
parser.add_option("--servicename", type="string", metavar="NAME",
704
help="Zeroconf service name")
705
parser.add_option("--configdir", type="string",
706
default="/etc/mandos", metavar="DIR",
707
help="Directory to search for configuration"
708
" files")
589
709
(options, args) = parser.parse_args()
590
710
591
711
if options.check:
593
713
doctest.testmod()
594
714
sys.exit()
595
715
596
# Parse the time arguments
597
try:
598
options.timeout = string_to_delta(options.timeout)
599
except ValueError:
600
parser.error("option --timeout: Unparseable time")
601
try:
602
options.interval = string_to_delta(options.interval)
603
except ValueError:
604
parser.error("option --interval: Unparseable time")
605
606
# Parse config file
607
defaults = { "checker": "fping -q -- %%(fqdn)s" }
608
client_config = ConfigParser.SafeConfigParser(defaults)
609
#client_config.readfp(open("secrets.conf"), "secrets.conf")
610
client_config.read("mandos-clients.conf")
611
612
# From the Avahi server example code
716
# Default values for config file for server-global settings
717
server_defaults = { "interface": "",
718
"address": "",
719
"port": "",
720
"debug": "False",
721
"priority":
722
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
723
"servicename": "Mandos",
724
}
725
726
# Parse config file for server-global settings
727
server_config = ConfigParser.SafeConfigParser(server_defaults)
728
del server_defaults
729
server_config.read(os.path.join(options.configdir, "mandos.conf"))
730
# Convert the SafeConfigParser object to a dict
731
server_settings = server_config.defaults()
732
# Use getboolean on the boolean config option
733
server_settings["debug"] = server_config.getboolean\
734
("DEFAULT", "debug")
735
del server_config
736
737
# Override the settings from the config file with command line
738
# options, if set.
739
for option in ("interface", "address", "port", "debug",
740
"priority", "servicename", "configdir"):
741
value = getattr(options, option)
742
if value is not None:
743
server_settings[option] = value
744
del options
745
# Now we have our good server settings in "server_settings"
746
747
debug = server_settings["debug"]
748
749
if not debug:
750
syslogger.setLevel(logging.WARNING)
751
console.setLevel(logging.WARNING)
752
753
if server_settings["servicename"] != "Mandos":
754
syslogger.setFormatter(logging.Formatter\
755
('Mandos (%s): %%(levelname)s:'
756
' %%(message)s'
757
% server_settings["servicename"]))
758
759
# Parse config file with clients
760
client_defaults = { "timeout": "1h",
761
"interval": "5m",
762
"checker": "fping -q -- %(host)s",
763
"host": "",
764
}
765
client_config = ConfigParser.SafeConfigParser(client_defaults)
766
client_config.read(os.path.join(server_settings["configdir"],
767
"clients.conf"))
768
769
clients = Set()
770
tcp_server = IPv6_TCPServer((server_settings["address"],
771
server_settings["port"]),
772
tcp_handler,
773
settings=server_settings,
774
clients=clients)
775
pidfilename = "/var/run/mandos.pid"
776
try:
777
pidfile = open(pidfilename, "w")
778
except IOError, error:
779
logger.error("Could not open file %r", pidfilename)
780
781
uid = 65534
782
gid = 65534
783
try:
784
uid = pwd.getpwnam("mandos").pw_uid
785
except KeyError:
786
try:
787
uid = pwd.getpwnam("nobody").pw_uid
788
except KeyError:
789
pass
790
try:
791
gid = pwd.getpwnam("mandos").pw_gid
792
except KeyError:
793
try:
794
gid = pwd.getpwnam("nogroup").pw_gid
795
except KeyError:
796
pass
797
try:
798
os.setuid(uid)
799
os.setgid(gid)
800
except OSError, error:
801
if error[0] != errno.EPERM:
802
raise error
803
804
global service
805
service = AvahiService(name = server_settings["servicename"],
806
type = "_mandos._tcp", );
807
if server_settings["interface"]:
808
service.interface = if_nametoindex\
809
(server_settings["interface"])
810
811
global main_loop
812
global bus
813
global server
814
# From the Avahi example code
613
815
DBusGMainLoop(set_as_default=True )
614
816
main_loop = gobject.MainLoop()
615
817
bus = dbus.SystemBus()
616
server = dbus.Interface(
617
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
618
avahi.DBUS_INTERFACE_SERVER )
818
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
819
avahi.DBUS_PATH_SERVER),
820
avahi.DBUS_INTERFACE_SERVER)
619
821
# End of Avahi example code
620
822
621
debug = options.debug
622
623
if debug:
624
console = logging.StreamHandler()
625
# console.setLevel(logging.DEBUG)
626
console.setFormatter(logging.Formatter\
627
('%(levelname)s: %(message)s'))
628
logger.addHandler(console)
629
del console
630
631
clients = Set()
632
823
def remove_from_clients(client):
633
824
clients.remove(client)
634
825
if not clients:
635
logger.debug(u"No clients left, exiting")
636
killme()
826
logger.critical(u"No clients left, exiting")
827
sys.exit()
637
828
638
clients.update(Set(Client(name=section, options=options,
829
clients.update(Set(Client(name = section,
639
830
stop_hook = remove_from_clients,
640
**(dict(client_config\
641
.items(section))))
831
config
832
= dict(client_config.items(section)))
642
833
for section in client_config.sections()))
643
644
if not debug:
645
daemon(False, False)
834
if not clients:
835
logger.critical(u"No clients defined")
836
sys.exit(1)
837
838
if debug:
839
# Redirect stdin so all checkers get /dev/null
840
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
841
os.dup2(null, sys.stdin.fileno())
842
if null > 2:
843
os.close(null)
844
else:
845
# No console logging
846
logger.removeHandler(console)
847
# Close all input and output, do double fork, etc.
848
daemon()
849
850
try:
851
pid = os.getpid()
852
pidfile.write(str(pid) + "\n")
853
pidfile.close()
854
del pidfile
855
except IOError, err:
856
logger.error(u"Could not write to file %r with PID %d",
857
pidfilename, pid)
858
except NameError:
859
# "pidfile" was never created
860
pass
861
del pidfilename
646
862
647
863
def cleanup():
648
864
"Cleanup function; run on exit"
649
865
global group
650
# From the Avahi server example code
866
# From the Avahi example code
651
867
if not group is None:
652
868
group.Free()
653
869
group = None
654
870
# End of Avahi example code
655
871
656
for client in clients:
872
while clients:
873
client = clients.pop()
657
874
client.stop_hook = None
658
875
client.stop()
659
876
661
878
662
879
if not debug:
663
880
signal.signal(signal.SIGINT, signal.SIG_IGN)
664
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
665
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
881
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
882
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
666
883
667
884
for client in clients:
668
885
client.start()
669
886
670
tcp_server = IPv6_TCPServer((None, options.port),
671
tcp_handler,
672
options=options,
673
clients=clients)
674
# Find out what random port we got
675
servicePort = tcp_server.socket.getsockname()[1]
676
logger.debug(u"Now listening on port %d", servicePort)
677
678
if options.interface is not None:
679
serviceInterface = if_nametoindex(options.interface)
680
681
# From the Avahi server example code
682
server.connect_to_signal("StateChanged", server_state_changed)
683
try:
684
server_state_changed(server.GetState())
685
except dbus.exceptions.DBusException, error:
686
logger.critical(u"DBusException: %s", error)
687
killme(1)
688
# End of Avahi example code
689
690
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
691
lambda *args, **kwargs:
692
tcp_server.handle_request(*args[2:],
693
**kwargs) or True)
694
try:
887
tcp_server.enable()
888
tcp_server.server_activate()
889
890
# Find out what port we got
891
service.port = tcp_server.socket.getsockname()[1]
892
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
893
u" scope_id %d" % tcp_server.socket.getsockname())
894
895
#service.interface = tcp_server.socket.getsockname()[3]
896
897
try:
898
# From the Avahi example code
899
server.connect_to_signal("StateChanged", server_state_changed)
900
try:
901
server_state_changed(server.GetState())
902
except dbus.exceptions.DBusException, error:
903
logger.critical(u"DBusException: %s", error)
904
sys.exit(1)
905
# End of Avahi example code
906
907
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
908
lambda *args, **kwargs:
909
tcp_server.handle_request\
910
(*args[2:], **kwargs) or True)
911
912
logger.debug(u"Starting main loop")
695
913
main_loop_started = True
696
914
main_loop.run()
915
except AvahiError, error:
916
logger.critical(u"AvahiError: %s" + unicode(error))
917
sys.exit(1)
697
918
except KeyboardInterrupt:
698
919
if debug:
699
920
print
700
701
sys.exit(exitstatus)
921
922
if __name__ == '__main__':
923
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0