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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:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.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 © 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
#
32
2
33
3
from __future__ import division
34
4
35
5
import SocketServer
36
6
import socket
7
import select
37
8
from optparse import OptionParser
38
9
import datetime
39
10
import errno
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
import pwd
58
24
59
25
import dbus
60
26
import gobject
61
27
import avahi
62
28
from dbus.mainloop.glib import DBusGMainLoop
63
29
import ctypes
64
import ctypes.util
65
66
version = "1.0.2"
30
31
import logging
32
import logging.handlers
33
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
67
35
68
36
logger = logging.Logger('mandos')
69
syslogger = logging.handlers.SysLogHandler\
70
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
address = "/dev/log")
72
syslogger.setFormatter(logging.Formatter\
73
('Mandos: %(levelname)s: %(message)s'))
74
logger.addHandler(syslogger)
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
super(AvahiError, self).__init__()
85
def __str__(self):
86
return repr(self.value)
87
88
class AvahiServiceError(AvahiError):
89
pass
90
91
class AvahiGroupError(AvahiError):
92
pass
93
94
95
class AvahiService(object):
96
"""An Avahi (Zeroconf) service.
97
Attributes:
98
interface: integer; avahi.IF_UNSPEC or an interface index.
99
Used to optionally bind to the specified interface.
100
name: string; Example: 'Mandos'
101
type: string; Example: '_mandos._tcp'.
102
See <http://www.dns-sd.org/ServiceTypes.html>
103
port: integer; what port to announce
104
TXT: list of strings; TXT record for the service
105
domain: string; Domain to publish on, default to .local if empty.
106
host: string; Host to publish records for, default is localhost
107
max_renames: integer; maximum number of renames
108
rename_count: integer; counter so we only rename after collisions
109
a sensible number of times
110
"""
111
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
112
servicetype = None, port = None, TXT = None, domain = "",
113
host = "", max_renames = 32768):
114
self.interface = interface
115
self.name = name
116
self.type = servicetype
117
self.port = port
118
if TXT is None:
119
self.TXT = []
120
else:
121
self.TXT = TXT
122
self.domain = domain
123
self.host = host
124
self.rename_count = 0
125
self.max_renames = max_renames
126
def rename(self):
127
"""Derived from the Avahi example code"""
128
if self.rename_count >= self.max_renames:
129
logger.critical(u"No suitable Zeroconf service name found"
130
u" after %i retries, exiting.",
131
self.rename_count)
132
raise AvahiServiceError("Too many renames")
133
self.name = server.GetAlternativeServiceName(self.name)
134
logger.info(u"Changing Zeroconf service name to %r ...",
135
str(self.name))
136
syslogger.setFormatter(logging.Formatter\
137
('Mandos (%s): %%(levelname)s:'
138
' %%(message)s' % self.name))
139
self.remove()
140
self.add()
141
self.rename_count += 1
142
def remove(self):
143
"""Derived from the Avahi example code"""
144
if group is not None:
145
group.Reset()
146
def add(self):
147
"""Derived from the Avahi example code"""
148
global group
149
if group is None:
150
group = dbus.Interface\
151
(bus.get_object(avahi.DBUS_NAME,
152
server.EntryGroupNew()),
153
avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
group.connect_to_signal('StateChanged',
155
entry_group_state_changed)
156
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
157
service.name, service.type)
158
group.AddService(
159
self.interface, # interface
160
avahi.PROTO_INET6, # protocol
161
dbus.UInt32(0), # flags
162
self.name, self.type,
163
self.domain, self.host,
164
dbus.UInt16(self.port),
165
avahi.string_array_to_txt_array(self.TXT))
166
group.Commit()
167
168
# From the Avahi example code:
169
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
170
53
# End of Avahi example code
171
54
172
55
177
60
fingerprint: string (40 or 32 hexadecimal digits); used to
178
61
uniquely identify the client
179
62
secret: bytestring; sent verbatim (over TLS) to client
180
host: string; available for use by the checker command
181
created: datetime.datetime(); object creation, not client host
182
last_checked_ok: datetime.datetime() or None if not yet checked OK
183
timeout: datetime.timedelta(); How long from last_checked_ok
184
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
185
68
interval: datetime.timedelta(); How often to start a new checker
186
69
stop_hook: If set, called by stop() as stop_hook(self)
187
70
checker: subprocess.Popen(); a running checker process used
188
71
to see if the client lives.
189
'None' if no process is running.
72
Is None if no process is running.
190
73
checker_initiator_tag: a gobject event source tag, or None
191
74
stop_initiator_tag: - '' -
192
75
checker_callback_tag: - '' -
193
76
checker_command: string; External command which is run to check if
194
client lives. %() expansions are done at
77
client lives. %()s expansions are done at
195
78
runtime with vars(self) as dict, so that for
196
79
instance %(name)s can be used in the command.
197
80
Private attibutes:
198
81
_timeout: Real variable for 'timeout'
199
82
_interval: Real variable for 'interval'
200
_timeout_milliseconds: Used when calling gobject.timeout_add()
83
_timeout_milliseconds: Used by gobject.timeout_add()
201
84
_interval_milliseconds: - '' -
202
85
"""
203
86
def _set_timeout(self, timeout):
223
106
interval = property(lambda self: self._interval,
224
107
_set_interval)
225
108
del _set_interval
226
def __init__(self, name = None, stop_hook=None, config=None):
227
"""Note: the 'checker' key in 'config' sets the
228
'checker_command' attribute and *not* the 'checker'
229
attribute."""
230
if config is None:
231
config = {}
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):
232
112
self.name = name
233
logger.debug(u"Creating client %r", self.name)
234
# Uppercase and remove spaces from fingerprint for later
235
# comparison purposes with return value from the fingerprint()
236
# function
237
self.fingerprint = config["fingerprint"].upper()\
238
.replace(u" ", u"")
239
logger.debug(u" Fingerprint: %s", self.fingerprint)
240
if "secret" in config:
241
self.secret = config["secret"].decode(u"base64")
242
elif "secfile" in config:
243
secfile = open(os.path.expanduser(os.path.expandvars
244
(config["secfile"])))
245
self.secret = secfile.read()
246
secfile.close()
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)
121
self.secret = sf.read()
122
sf.close()
247
123
else:
248
raise TypeError(u"No secret or secfile for client %s"
249
% self.name)
250
self.host = config.get("host", "")
124
raise RuntimeError(u"No secret or secfile for client %s"
125
% self.name)
126
self.fqdn = fqdn # string
251
127
self.created = datetime.datetime.now()
252
self.last_checked_ok = None
253
self.timeout = string_to_delta(config["timeout"])
254
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
255
137
self.stop_hook = stop_hook
256
138
self.checker = None
257
139
self.checker_initiator_tag = None
258
140
self.stop_initiator_tag = None
259
141
self.checker_callback_tag = None
260
self.check_command = config["checker"]
142
self.check_command = checker
261
143
def start(self):
262
"""Start this client's checker and timeout hooks"""
144
"""Start this clients checker and timeout hooks"""
263
145
# Schedule a new checker to be started an 'interval' from now,
264
146
# and every interval from then on.
265
147
self.checker_initiator_tag = gobject.timeout_add\
273
155
self.stop)
274
156
def stop(self):
275
157
"""Stop this client.
276
The possibility that a client might be restarted is left open,
277
but not currently used."""
278
# If this client doesn't have a secret, it is already stopped.
279
if hasattr(self, "secret") and self.secret:
280
logger.info(u"Stopping client %s", self.name)
281
self.secret = None
282
else:
283
return False
284
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:
285
163
gobject.source_remove(self.stop_initiator_tag)
286
164
self.stop_initiator_tag = None
287
if getattr(self, "checker_initiator_tag", False):
165
if self.checker_initiator_tag:
288
166
gobject.source_remove(self.checker_initiator_tag)
289
167
self.checker_initiator_tag = None
290
168
self.stop_checker()
293
171
# Do not run this again if called by a gobject.timeout_add
294
172
return False
295
173
def __del__(self):
296
self.stop_hook = None
297
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()
298
184
def checker_callback(self, pid, condition):
299
185
"""The checker has completed, so take appropriate actions."""
300
186
now = datetime.datetime.now()
301
self.checker_callback_tag = None
302
self.checker = None
303
187
if os.WIFEXITED(condition) \
304
188
and (os.WEXITSTATUS(condition) == 0):
305
logger.info(u"Checker for %(name)s succeeded",
306
vars(self))
307
self.last_checked_ok = now
189
logger.debug(u"Checker for %(name)s succeeded",
190
vars(self))
191
self.last_seen = now
308
192
gobject.source_remove(self.stop_initiator_tag)
309
193
self.stop_initiator_tag = gobject.timeout_add\
310
194
(self._timeout_milliseconds,
311
195
self.stop)
312
elif not os.WIFEXITED(condition):
196
if not os.WIFEXITED(condition):
313
197
logger.warning(u"Checker for %(name)s crashed?",
314
198
vars(self))
315
199
else:
316
logger.info(u"Checker for %(name)s failed",
317
vars(self))
200
logger.debug(u"Checker for %(name)s failed",
201
vars(self))
202
self.checker = None
203
self.checker_callback_tag = None
318
204
def start_checker(self):
319
205
"""Start a new checker subprocess if one is not running.
320
206
If a checker already exists, leave it running and do
321
207
nothing."""
322
# The reason for not killing a running checker is that if we
323
# did that, then if a checker (for some reason) started
324
# running slowly and taking more than 'interval' time, the
325
# client would inevitably timeout, since no checker would get
326
# a chance to run to completion. If we instead leave running
327
# checkers alone, the checker would have to take more time
328
# than 'timeout' for the client to be declared invalid, which
329
# is as it should be.
330
208
if self.checker is None:
209
logger.debug(u"Starting checker for %s",
210
self.name)
331
211
try:
332
# In case check_command has exactly one % operator
333
command = self.check_command % self.host
212
command = self.check_command % self.fqdn
334
213
except TypeError:
335
# Escape attributes for the shell
336
214
escaped_attrs = dict((key, re.escape(str(val)))
337
215
for key, val in
338
216
vars(self).iteritems())
339
217
try:
340
218
command = self.check_command % escaped_attrs
341
219
except TypeError, error:
342
logger.error(u'Could not format string "%s":'
343
u' %s', self.check_command, error)
220
logger.critical(u'Could not format string "%s": %s',
221
self.check_command, error)
344
222
return True # Try again later
345
223
try:
346
logger.info(u"Starting checker %r for %s",
347
command, self.name)
348
# We don't need to redirect stdout and stderr, since
349
# in normal mode, that is already done by daemon(),
350
# and in debug mode we don't want to. (Stdin is
351
# always replaced by /dev/null.)
352
self.checker = subprocess.Popen(command,
353
close_fds=True,
354
shell=True, cwd="/")
355
self.checker_callback_tag = gobject.child_watch_add\
356
(self.checker.pid,
357
self.checker_callback)
358
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:
359
234
logger.error(u"Failed to start subprocess: %s",
360
235
error)
361
236
# Re-run this periodically if run by gobject.timeout_add
362
237
return True
363
238
def stop_checker(self):
364
239
"""Force the checker process, if any, to stop."""
365
if self.checker_callback_tag:
366
gobject.source_remove(self.checker_callback_tag)
367
self.checker_callback_tag = None
368
if getattr(self, "checker", None) is None:
240
if not hasattr(self, "checker") or self.checker is None:
369
241
return
370
logger.debug(u"Stopping checker for %(name)s", vars(self))
371
try:
372
os.kill(self.checker.pid, signal.SIGTERM)
373
#os.sleep(0.5)
374
#if self.checker.poll() is None:
375
# os.kill(self.checker.pid, signal.SIGKILL)
376
except OSError, error:
377
if error.errno != errno.ESRCH: # No such process
378
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)
379
247
self.checker = None
380
def still_valid(self):
248
def still_valid(self, now=None):
381
249
"""Has the timeout not yet passed for this client?"""
382
now = datetime.datetime.now()
383
if self.last_checked_ok is None:
250
if now is None:
251
now = datetime.datetime.now()
252
if self.last_seen is None:
384
253
return now < (self.created + self.timeout)
385
254
else:
386
return now < (self.last_checked_ok + self.timeout)
255
return now < (self.last_seen + self.timeout)
387
256
388
257
389
258
def peer_certificate(session):
390
"Return the peer's OpenPGP certificate as a bytestring"
391
259
# If not an OpenPGP certificate...
392
260
if gnutls.library.functions.gnutls_certificate_type_get\
393
261
(session._c_object) \
404
272
405
273
406
274
def fingerprint(openpgp):
407
"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))
408
279
# New GnuTLS "datum" with the OpenPGP public key
409
280
datum = gnutls.library.types.gnutls_datum_t\
410
281
(ctypes.cast(ctypes.c_char_p(openpgp),
411
282
ctypes.POINTER(ctypes.c_ubyte)),
412
283
ctypes.c_uint(len(openpgp)))
413
# New empty GnuTLS certificate
414
crt = gnutls.library.types.gnutls_openpgp_crt_t()
415
gnutls.library.functions.gnutls_openpgp_crt_init\
416
(ctypes.byref(crt))
417
284
# Import the OpenPGP public key into the certificate
418
gnutls.library.functions.gnutls_openpgp_crt_import\
419
(crt, ctypes.byref(datum),
420
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
421
# Verify the self signature in the key
422
crtverify = ctypes.c_uint()
423
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
424
(crt, 0, ctypes.byref(crtverify))
425
if crtverify.value != 0:
426
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
427
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)
428
289
# New buffer for the fingerprint
429
buf = ctypes.create_string_buffer(20)
430
buf_len = ctypes.c_size_t()
290
buffer = ctypes.create_string_buffer(20)
291
buffer_length = ctypes.c_size_t()
431
292
# Get the fingerprint from the certificate into the buffer
432
293
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
433
(crt, ctypes.byref(buf), ctypes.byref(buf_len))
294
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
434
295
# Deinit the certificate
435
296
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
436
297
# Convert the buffer to a Python bytestring
437
fpr = ctypes.string_at(buf, buf_len.value)
298
fpr = ctypes.string_at(buffer, buffer_length.value)
438
299
# Convert the bytestring to hexadecimal notation
439
300
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
440
301
return hex_fpr
441
302
442
303
443
class TCP_handler(SocketServer.BaseRequestHandler, object):
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
444
305
"""A TCP request handler class.
445
306
Instantiated by IPv6_TCPServer for each request to handle it.
446
307
Note: This will run in its own forked process."""
447
308
448
309
def handle(self):
449
logger.info(u"TCP connection from: %s",
310
logger.debug(u"TCP connection from: %s",
450
311
unicode(self.client_address))
451
session = gnutls.connection.ClientSession\
452
(self.request, gnutls.connection.X509Credentials())
453
454
line = self.request.makefile().readline()
455
logger.debug(u"Protocol version: %r", line)
456
try:
457
if int(line.strip().split()[0]) > 1:
458
raise RuntimeError
459
except (ValueError, IndexError, RuntimeError), error:
460
logger.error(u"Unknown protocol version: %s", error)
461
return
462
463
# Note: gnutls.connection.X509Credentials is really a generic
464
# GnuTLS certificate credentials object so long as no X.509
465
# keys are added to it. Therefore, we can use it here despite
466
# using OpenPGP certificates.
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
467
315
468
316
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
469
317
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
470
318
# "+DHE-DSS"))
471
priority = "NORMAL" # Fallback default, since this
472
# MUST be set.
473
if self.server.settings["priority"]:
474
priority = self.server.settings["priority"]
319
priority = "SECURE256"
320
475
321
gnutls.library.functions.gnutls_priority_set_direct\
476
(session._c_object, priority, None)
322
(session._c_object, priority, None);
477
323
478
324
try:
479
325
session.handshake()
480
326
except gnutls.errors.GNUTLSError, error:
481
logger.warning(u"Handshake failed: %s", error)
327
logger.debug(u"Handshake failed: %s", error)
482
328
# Do not run session.bye() here: the session is not
483
329
# established. Just abandon the request.
484
330
return
485
331
try:
486
332
fpr = fingerprint(peer_certificate(session))
487
333
except (TypeError, gnutls.errors.GNUTLSError), error:
488
logger.warning(u"Bad certificate: %s", error)
334
logger.debug(u"Bad certificate: %s", error)
489
335
session.bye()
490
336
return
491
337
logger.debug(u"Fingerprint: %s", fpr)
492
338
client = None
493
for c in self.server.clients:
339
for c in clients:
494
340
if c.fingerprint == fpr:
495
341
client = c
496
342
break
497
if not client:
498
logger.warning(u"Client not found for fingerprint: %s",
499
fpr)
500
session.bye()
501
return
502
343
# Have to check if client.still_valid(), since it is possible
503
344
# that the client timed out while establishing the GnuTLS
504
345
# session.
505
if not client.still_valid():
506
logger.warning(u"Client %(name)s is invalid",
507
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)
508
353
session.bye()
509
354
return
510
355
sent_size = 0
520
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
521
366
"""IPv6 TCP server. Accepts 'None' as address and/or port.
522
367
Attributes:
523
settings: Server settings
368
options: Command line options
524
369
clients: Set() of Client objects
525
enabled: Boolean; whether this server is activated yet
526
370
"""
527
371
address_family = socket.AF_INET6
528
372
def __init__(self, *args, **kwargs):
529
if "settings" in kwargs:
530
self.settings = kwargs["settings"]
531
del kwargs["settings"]
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
532
376
if "clients" in kwargs:
533
377
self.clients = kwargs["clients"]
534
378
del kwargs["clients"]
535
self.enabled = False
536
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
379
return super(type(self), self).__init__(*args, **kwargs)
537
380
def server_bind(self):
538
381
"""This overrides the normal server_bind() function
539
382
to bind to an interface if one was specified, and also NOT to
540
383
bind to an address or port if they were not specified."""
541
if self.settings["interface"]:
542
# 25 is from /usr/include/asm-i486/socket.h
543
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
544
388
try:
545
389
self.socket.setsockopt(socket.SOL_SOCKET,
546
SO_BINDTODEVICE,
547
self.settings["interface"])
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
548
392
except socket.error, error:
549
393
if error[0] == errno.EPERM:
550
logger.error(u"No permission to"
551
u" bind to interface %s",
552
self.settings["interface"])
394
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
553
397
else:
554
398
raise error
555
399
# Only bind(2) the socket if we really need to.
558
402
in6addr_any = "::"
559
403
self.server_address = (in6addr_any,
560
404
self.server_address[1])
561
elif not self.server_address[1]:
405
elif self.server_address[1] is None:
562
406
self.server_address = (self.server_address[0],
563
407
0)
564
# if self.settings["interface"]:
565
# self.server_address = (self.server_address[0],
566
# 0, # port
567
# 0, # flowinfo
568
# if_nametoindex
569
# (self.settings
570
# ["interface"]))
571
return super(IPv6_TCPServer, self).server_bind()
572
def server_activate(self):
573
if self.enabled:
574
return super(IPv6_TCPServer, self).server_activate()
575
def enable(self):
576
self.enabled = True
408
return super(type(self), self).server_bind()
577
409
578
410
579
411
def string_to_delta(interval):
589
421
datetime.timedelta(1)
590
422
>>> string_to_delta(u'1w')
591
423
datetime.timedelta(7)
592
>>> string_to_delta('5m 30s')
593
datetime.timedelta(0, 330)
594
424
"""
595
timevalue = datetime.timedelta(0)
596
for s in interval.split():
597
try:
598
suffix = unicode(s[-1])
599
value = int(s[:-1])
600
if suffix == u"d":
601
delta = datetime.timedelta(value)
602
elif suffix == u"s":
603
delta = datetime.timedelta(0, value)
604
elif suffix == u"m":
605
delta = datetime.timedelta(0, 0, 0, 0, value)
606
elif suffix == u"h":
607
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
608
elif suffix == u"w":
609
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
610
else:
611
raise ValueError
612
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:
613
439
raise ValueError
614
timevalue += delta
615
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()
616
476
617
477
618
478
def server_state_changed(state):
619
"""Derived from the Avahi example code"""
479
"""From the Avahi server example code"""
620
480
if state == avahi.SERVER_COLLISION:
621
logger.error(u"Zeroconf server name collision")
622
service.remove()
481
logger.warning(u"Server name collision")
482
remove_service()
623
483
elif state == avahi.SERVER_RUNNING:
624
service.add()
484
add_service()
625
485
626
486
627
487
def entry_group_state_changed(state, error):
628
"""Derived from the Avahi example code"""
629
logger.debug(u"Avahi state change: %i", state)
488
"""From the Avahi server example code"""
489
global serviceName, server, rename_count
490
491
logger.debug(u"state change: %i", state)
630
492
631
493
if state == avahi.ENTRY_GROUP_ESTABLISHED:
632
logger.debug(u"Zeroconf service established.")
494
logger.debug(u"Service established.")
633
495
elif state == avahi.ENTRY_GROUP_COLLISION:
634
logger.warning(u"Zeroconf service name collision.")
635
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()
636
510
elif state == avahi.ENTRY_GROUP_FAILURE:
637
logger.critical(u"Avahi: Error in group state changed %s",
638
unicode(error))
639
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
640
516
641
517
def if_nametoindex(interface):
642
"""Call the C function if_nametoindex(), or equivalent"""
643
global if_nametoindex
518
"""Call the C function if_nametoindex()"""
644
519
try:
645
if_nametoindex = ctypes.cdll.LoadLibrary\
646
(ctypes.util.find_library("c")).if_nametoindex
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
return libc.if_nametoindex(interface)
647
522
except (OSError, AttributeError):
648
523
if "struct" not in sys.modules:
649
524
import struct
650
525
if "fcntl" not in sys.modules:
651
526
import fcntl
652
def if_nametoindex(interface):
653
"Get an interface index the hard way, i.e. using fcntl()"
654
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
655
s = socket.socket()
656
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
657
struct.pack("16s16x", interface))
658
s.close()
659
interface_index = struct.unpack("I", ifreq[16:20])[0]
660
return interface_index
661
return if_nametoindex(interface)
662
663
664
def daemon(nochdir = False, noclose = False):
665
"""See daemon(3). Standard BSD Unix function.
666
This should really exist as os.daemon, but it doesn't (yet)."""
667
if os.fork():
668
sys.exit()
669
os.setsid()
670
if not nochdir:
671
os.chdir("/")
672
if os.fork():
673
sys.exit()
674
if not noclose:
675
# Close all standard open file descriptors
676
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
677
if not stat.S_ISCHR(os.fstat(null).st_mode):
678
raise OSError(errno.ENODEV,
679
"/dev/null not a character device")
680
os.dup2(null, sys.stdin.fileno())
681
os.dup2(null, sys.stdout.fileno())
682
os.dup2(null, sys.stderr.fileno())
683
if null > 2:
684
os.close(null)
685
686
687
def main():
688
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()
689
538
parser.add_option("-i", "--interface", type="string",
690
metavar="IF", help="Bind to interface IF")
691
parser.add_option("-a", "--address", type="string",
692
help="Address to listen for requests on")
693
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,
694
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")
695
561
parser.add_option("--check", action="store_true", default=False,
696
562
help="Run self-test")
697
parser.add_option("--debug", action="store_true",
698
help="Debug mode; run in foreground and log to"
699
" terminal")
700
parser.add_option("--priority", type="string", help="GnuTLS"
701
" priority string (see GnuTLS documentation)")
702
parser.add_option("--servicename", type="string", metavar="NAME",
703
help="Zeroconf service name")
704
parser.add_option("--configdir", type="string",
705
default="/etc/mandos", metavar="DIR",
706
help="Directory to search for configuration"
707
" files")
708
options = parser.parse_args()[0]
563
parser.add_option("--debug", action="store_true", default=False,
564
help="Debug mode")
565
(options, args) = parser.parse_args()
709
566
710
567
if options.check:
711
568
import doctest
712
569
doctest.testmod()
713
570
sys.exit()
714
571
715
# Default values for config file for server-global settings
716
server_defaults = { "interface": "",
717
"address": "",
718
"port": "",
719
"debug": "False",
720
"priority":
721
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
722
"servicename": "Mandos",
723
}
724
725
# Parse config file for server-global settings
726
server_config = ConfigParser.SafeConfigParser(server_defaults)
727
del server_defaults
728
server_config.read(os.path.join(options.configdir, "mandos.conf"))
729
# Convert the SafeConfigParser object to a dict
730
server_settings = server_config.defaults()
731
# Use getboolean on the boolean config option
732
server_settings["debug"] = server_config.getboolean\
733
("DEFAULT", "debug")
734
del server_config
735
736
# Override the settings from the config file with command line
737
# options, if set.
738
for option in ("interface", "address", "port", "debug",
739
"priority", "servicename", "configdir"):
740
value = getattr(options, option)
741
if value is not None:
742
server_settings[option] = value
743
del options
744
# Now we have our good server settings in "server_settings"
745
746
debug = server_settings["debug"]
747
748
if not debug:
749
syslogger.setLevel(logging.WARNING)
750
console.setLevel(logging.WARNING)
751
752
if server_settings["servicename"] != "Mandos":
753
syslogger.setFormatter(logging.Formatter\
754
('Mandos (%s): %%(levelname)s:'
755
' %%(message)s'
756
% server_settings["servicename"]))
757
758
# Parse config file with clients
759
client_defaults = { "timeout": "1h",
760
"interval": "5m",
761
"checker": "fping -q -- %(host)s",
762
"host": "",
763
}
764
client_config = ConfigParser.SafeConfigParser(client_defaults)
765
client_config.read(os.path.join(server_settings["configdir"],
766
"clients.conf"))
767
768
clients = Set()
769
tcp_server = IPv6_TCPServer((server_settings["address"],
770
server_settings["port"]),
771
TCP_handler,
772
settings=server_settings,
773
clients=clients)
774
pidfilename = "/var/run/mandos.pid"
775
try:
776
pidfile = open(pidfilename, "w")
777
except IOError, error:
778
logger.error("Could not open file %r", pidfilename)
779
780
uid = 65534
781
gid = 65534
782
try:
783
uid = pwd.getpwnam("mandos").pw_uid
784
except KeyError:
785
try:
786
uid = pwd.getpwnam("nobody").pw_uid
787
except KeyError:
788
pass
789
try:
790
gid = pwd.getpwnam("mandos").pw_gid
791
except KeyError:
792
try:
793
gid = pwd.getpwnam("nogroup").pw_gid
794
except KeyError:
795
pass
796
try:
797
os.setuid(uid)
798
os.setgid(gid)
799
except OSError, error:
800
if error[0] != errno.EPERM:
801
raise error
802
803
global service
804
service = AvahiService(name = server_settings["servicename"],
805
servicetype = "_mandos._tcp", )
806
if server_settings["interface"]:
807
service.interface = if_nametoindex\
808
(server_settings["interface"])
809
810
global main_loop
811
global bus
812
global server
813
# 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
814
589
DBusGMainLoop(set_as_default=True )
815
590
main_loop = gobject.MainLoop()
816
591
bus = dbus.SystemBus()
817
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
818
avahi.DBUS_PATH_SERVER),
819
avahi.DBUS_INTERFACE_SERVER)
592
server = dbus.Interface(
593
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
594
avahi.DBUS_INTERFACE_SERVER )
820
595
# End of Avahi example code
821
596
597
debug = options.debug
598
599
clients = Set()
822
600
def remove_from_clients(client):
823
601
clients.remove(client)
824
602
if not clients:
825
logger.critical(u"No clients left, exiting")
826
sys.exit()
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
827
605
828
clients.update(Set(Client(name = section,
606
clients.update(Set(Client(name=section, options=options,
829
607
stop_hook = remove_from_clients,
830
config
831
= dict(client_config.items(section)))
608
**(dict(client_config\
609
.items(section))))
832
610
for section in client_config.sections()))
833
if not clients:
834
logger.critical(u"No clients defined")
835
sys.exit(1)
836
837
if debug:
838
# Redirect stdin so all checkers get /dev/null
839
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
840
os.dup2(null, sys.stdin.fileno())
841
if null > 2:
842
os.close(null)
843
else:
844
# No console logging
845
logger.removeHandler(console)
846
# Close all input and output, do double fork, etc.
847
daemon()
848
849
try:
850
pid = os.getpid()
851
pidfile.write(str(pid) + "\n")
852
pidfile.close()
853
del pidfile
854
except IOError:
855
logger.error(u"Could not write to file %r with PID %d",
856
pidfilename, pid)
857
except NameError:
858
# "pidfile" was never created
859
pass
860
del pidfilename
861
862
def cleanup():
863
"Cleanup function; run on exit"
864
global group
865
# From the Avahi example code
866
if not group is None:
867
group.Free()
868
group = None
869
# End of Avahi example code
870
871
while clients:
872
client = clients.pop()
873
client.stop_hook = None
874
client.stop()
875
876
atexit.register(cleanup)
877
878
if not debug:
879
signal.signal(signal.SIGINT, signal.SIG_IGN)
880
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
881
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
882
883
611
for client in clients:
884
612
client.start()
885
613
886
tcp_server.enable()
887
tcp_server.server_activate()
888
889
# Find out what port we got
890
service.port = tcp_server.socket.getsockname()[1]
891
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
892
u" scope_id %d" % tcp_server.socket.getsockname())
893
894
#service.interface = tcp_server.socket.getsockname()[3]
895
614
tcp_server = IPv6_TCPServer((None, options.port),
615
tcp_handler,
616
options=options,
617
clients=clients)
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)
896
634
try:
897
# From the Avahi example code
898
server.connect_to_signal("StateChanged", server_state_changed)
899
try:
900
server_state_changed(server.GetState())
901
except dbus.exceptions.DBusException, error:
902
logger.critical(u"DBusException: %s", error)
903
sys.exit(1)
904
# End of Avahi example code
905
906
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
907
lambda *args, **kwargs:
908
tcp_server.handle_request\
909
(*args[2:], **kwargs) or True)
910
911
logger.debug(u"Starting main loop")
912
635
main_loop.run()
913
except AvahiError, error:
914
logger.critical(u"AvahiError: %s" + unicode(error))
915
sys.exit(1)
916
636
except KeyboardInterrupt:
917
if debug:
918
print
637
print
638
639
# Cleanup here
919
640
920
if __name__ == '__main__':
921
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