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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
from __future__ import division, with_statement, absolute_import
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
from contextlib import closing
59
24
60
25
import dbus
61
26
import gobject
62
27
import avahi
63
28
from dbus.mainloop.glib import DBusGMainLoop
64
29
import ctypes
65
import ctypes.util
66
67
version = "1.0.2"
30
31
import logging
32
import logging.handlers
33
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
68
35
69
36
logger = logging.Logger('mandos')
70
syslogger = logging.handlers.SysLogHandler\
71
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
72
address = "/dev/log")
73
syslogger.setFormatter(logging.Formatter\
74
('Mandos: %(levelname)s: %(message)s'))
75
logger.addHandler(syslogger)
76
77
console = logging.StreamHandler()
78
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
79
' %(message)s'))
80
logger.addHandler(console)
81
82
class AvahiError(Exception):
83
def __init__(self, value):
84
self.value = value
85
super(AvahiError, self).__init__()
86
def __str__(self):
87
return repr(self.value)
88
89
class AvahiServiceError(AvahiError):
90
pass
91
92
class AvahiGroupError(AvahiError):
93
pass
94
95
96
class AvahiService(object):
97
"""An Avahi (Zeroconf) service.
98
Attributes:
99
interface: integer; avahi.IF_UNSPEC or an interface index.
100
Used to optionally bind to the specified interface.
101
name: string; Example: 'Mandos'
102
type: string; Example: '_mandos._tcp'.
103
See <http://www.dns-sd.org/ServiceTypes.html>
104
port: integer; what port to announce
105
TXT: list of strings; TXT record for the service
106
domain: string; Domain to publish on, default to .local if empty.
107
host: string; Host to publish records for, default is localhost
108
max_renames: integer; maximum number of renames
109
rename_count: integer; counter so we only rename after collisions
110
a sensible number of times
111
"""
112
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
113
servicetype = None, port = None, TXT = None, domain = "",
114
host = "", max_renames = 32768):
115
self.interface = interface
116
self.name = name
117
self.type = servicetype
118
self.port = port
119
if TXT is None:
120
self.TXT = []
121
else:
122
self.TXT = TXT
123
self.domain = domain
124
self.host = host
125
self.rename_count = 0
126
self.max_renames = max_renames
127
def rename(self):
128
"""Derived from the Avahi example code"""
129
if self.rename_count >= self.max_renames:
130
logger.critical(u"No suitable Zeroconf service name found"
131
u" after %i retries, exiting.",
132
self.rename_count)
133
raise AvahiServiceError("Too many renames")
134
self.name = server.GetAlternativeServiceName(self.name)
135
logger.info(u"Changing Zeroconf service name to %r ...",
136
str(self.name))
137
syslogger.setFormatter(logging.Formatter\
138
('Mandos (%s): %%(levelname)s:'
139
' %%(message)s' % self.name))
140
self.remove()
141
self.add()
142
self.rename_count += 1
143
def remove(self):
144
"""Derived from the Avahi example code"""
145
if group is not None:
146
group.Reset()
147
def add(self):
148
"""Derived from the Avahi example code"""
149
global group
150
if group is None:
151
group = dbus.Interface\
152
(bus.get_object(avahi.DBUS_NAME,
153
server.EntryGroupNew()),
154
avahi.DBUS_INTERFACE_ENTRY_GROUP)
155
group.connect_to_signal('StateChanged',
156
entry_group_state_changed)
157
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
158
service.name, service.type)
159
group.AddService(
160
self.interface, # interface
161
avahi.PROTO_INET6, # protocol
162
dbus.UInt32(0), # flags
163
self.name, self.type,
164
self.domain, self.host,
165
dbus.UInt16(self.port),
166
avahi.string_array_to_txt_array(self.TXT))
167
group.Commit()
168
169
# From the Avahi example code:
170
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
171
53
# End of Avahi example code
172
54
173
55
178
60
fingerprint: string (40 or 32 hexadecimal digits); used to
179
61
uniquely identify the client
180
62
secret: bytestring; sent verbatim (over TLS) to client
181
host: string; available for use by the checker command
182
created: datetime.datetime(); object creation, not client host
183
last_checked_ok: datetime.datetime() or None if not yet checked OK
184
timeout: datetime.timedelta(); How long from last_checked_ok
185
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
186
68
interval: datetime.timedelta(); How often to start a new checker
187
69
stop_hook: If set, called by stop() as stop_hook(self)
188
70
checker: subprocess.Popen(); a running checker process used
189
71
to see if the client lives.
190
'None' if no process is running.
72
Is None if no process is running.
191
73
checker_initiator_tag: a gobject event source tag, or None
192
74
stop_initiator_tag: - '' -
193
75
checker_callback_tag: - '' -
194
76
checker_command: string; External command which is run to check if
195
client lives. %() expansions are done at
77
client lives. %()s expansions are done at
196
78
runtime with vars(self) as dict, so that for
197
79
instance %(name)s can be used in the command.
198
80
Private attibutes:
199
81
_timeout: Real variable for 'timeout'
200
82
_interval: Real variable for 'interval'
201
_timeout_milliseconds: Used when calling gobject.timeout_add()
83
_timeout_milliseconds: Used by gobject.timeout_add()
202
84
_interval_milliseconds: - '' -
203
85
"""
204
86
def _set_timeout(self, timeout):
224
106
interval = property(lambda self: self._interval,
225
107
_set_interval)
226
108
del _set_interval
227
def __init__(self, name = None, stop_hook=None, config=None):
228
"""Note: the 'checker' key in 'config' sets the
229
'checker_command' attribute and *not* the 'checker'
230
attribute."""
231
if config is None:
232
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):
233
112
self.name = name
234
logger.debug(u"Creating client %r", self.name)
235
# Uppercase and remove spaces from fingerprint for later
236
# comparison purposes with return value from the fingerprint()
237
# function
238
self.fingerprint = config["fingerprint"].upper()\
239
.replace(u" ", u"")
240
logger.debug(u" Fingerprint: %s", self.fingerprint)
241
if "secret" in config:
242
self.secret = config["secret"].decode(u"base64")
243
elif "secfile" in config:
244
with closing(open(os.path.expanduser
245
(os.path.expandvars
246
(config["secfile"])))) \
247
as secfile:
248
self.secret = secfile.read()
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()
249
123
else:
250
raise TypeError(u"No secret or secfile for client %s"
251
% self.name)
252
self.host = config.get("host", "")
124
raise RuntimeError(u"No secret or secfile for client %s"
125
% self.name)
126
self.fqdn = fqdn # string
253
127
self.created = datetime.datetime.now()
254
self.last_checked_ok = None
255
self.timeout = string_to_delta(config["timeout"])
256
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
257
137
self.stop_hook = stop_hook
258
138
self.checker = None
259
139
self.checker_initiator_tag = None
260
140
self.stop_initiator_tag = None
261
141
self.checker_callback_tag = None
262
self.check_command = config["checker"]
142
self.check_command = checker
263
143
def start(self):
264
"""Start this client's checker and timeout hooks"""
144
"""Start this clients checker and timeout hooks"""
265
145
# Schedule a new checker to be started an 'interval' from now,
266
146
# and every interval from then on.
267
147
self.checker_initiator_tag = gobject.timeout_add\
275
155
self.stop)
276
156
def stop(self):
277
157
"""Stop this client.
278
The possibility that a client might be restarted is left open,
279
but not currently used."""
280
# If this client doesn't have a secret, it is already stopped.
281
if hasattr(self, "secret") and self.secret:
282
logger.info(u"Stopping client %s", self.name)
283
self.secret = None
284
else:
285
return False
286
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:
287
163
gobject.source_remove(self.stop_initiator_tag)
288
164
self.stop_initiator_tag = None
289
if getattr(self, "checker_initiator_tag", False):
165
if self.checker_initiator_tag:
290
166
gobject.source_remove(self.checker_initiator_tag)
291
167
self.checker_initiator_tag = None
292
168
self.stop_checker()
295
171
# Do not run this again if called by a gobject.timeout_add
296
172
return False
297
173
def __del__(self):
298
self.stop_hook = None
299
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()
300
184
def checker_callback(self, pid, condition):
301
185
"""The checker has completed, so take appropriate actions."""
302
self.checker_callback_tag = None
303
self.checker = None
186
now = datetime.datetime.now()
304
187
if os.WIFEXITED(condition) \
305
188
and (os.WEXITSTATUS(condition) == 0):
306
logger.info(u"Checker for %(name)s succeeded",
307
vars(self))
308
self.bump_timeout()
309
elif not os.WIFEXITED(condition):
189
logger.debug(u"Checker for %(name)s succeeded",
190
vars(self))
191
self.last_seen = now
192
gobject.source_remove(self.stop_initiator_tag)
193
self.stop_initiator_tag = gobject.timeout_add\
194
(self._timeout_milliseconds,
195
self.stop)
196
if not os.WIFEXITED(condition):
310
197
logger.warning(u"Checker for %(name)s crashed?",
311
198
vars(self))
312
199
else:
313
logger.info(u"Checker for %(name)s failed",
314
vars(self))
315
def bump_timeout(self):
316
"""Bump up the timeout for this client.
317
This should only be called when the client has been seen,
318
alive and well.
319
"""
320
self.last_checked_ok = datetime.datetime.now()
321
gobject.source_remove(self.stop_initiator_tag)
322
self.stop_initiator_tag = gobject.timeout_add\
323
(self._timeout_milliseconds, self.stop)
200
logger.debug(u"Checker for %(name)s failed",
201
vars(self))
202
self.checker = None
203
self.checker_callback_tag = None
324
204
def start_checker(self):
325
205
"""Start a new checker subprocess if one is not running.
326
206
If a checker already exists, leave it running and do
327
207
nothing."""
328
# The reason for not killing a running checker is that if we
329
# did that, then if a checker (for some reason) started
330
# running slowly and taking more than 'interval' time, the
331
# client would inevitably timeout, since no checker would get
332
# a chance to run to completion. If we instead leave running
333
# checkers alone, the checker would have to take more time
334
# than 'timeout' for the client to be declared invalid, which
335
# is as it should be.
336
208
if self.checker is None:
209
logger.debug(u"Starting checker for %s",
210
self.name)
337
211
try:
338
# In case check_command has exactly one % operator
339
command = self.check_command % self.host
212
command = self.check_command % self.fqdn
340
213
except TypeError:
341
# Escape attributes for the shell
342
214
escaped_attrs = dict((key, re.escape(str(val)))
343
215
for key, val in
344
216
vars(self).iteritems())
345
217
try:
346
218
command = self.check_command % escaped_attrs
347
219
except TypeError, error:
348
logger.error(u'Could not format string "%s":'
349
u' %s', self.check_command, error)
220
logger.critical(u'Could not format string "%s": %s',
221
self.check_command, error)
350
222
return True # Try again later
351
223
try:
352
logger.info(u"Starting checker %r for %s",
353
command, self.name)
354
# We don't need to redirect stdout and stderr, since
355
# in normal mode, that is already done by daemon(),
356
# and in debug mode we don't want to. (Stdin is
357
# always replaced by /dev/null.)
358
self.checker = subprocess.Popen(command,
359
close_fds=True,
360
shell=True, cwd="/")
361
self.checker_callback_tag = gobject.child_watch_add\
362
(self.checker.pid,
363
self.checker_callback)
364
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:
365
234
logger.error(u"Failed to start subprocess: %s",
366
235
error)
367
236
# Re-run this periodically if run by gobject.timeout_add
368
237
return True
369
238
def stop_checker(self):
370
239
"""Force the checker process, if any, to stop."""
371
if self.checker_callback_tag:
372
gobject.source_remove(self.checker_callback_tag)
373
self.checker_callback_tag = None
374
if getattr(self, "checker", None) is None:
240
if not hasattr(self, "checker") or self.checker is None:
375
241
return
376
logger.debug(u"Stopping checker for %(name)s", vars(self))
377
try:
378
os.kill(self.checker.pid, signal.SIGTERM)
379
#os.sleep(0.5)
380
#if self.checker.poll() is None:
381
# os.kill(self.checker.pid, signal.SIGKILL)
382
except OSError, error:
383
if error.errno != errno.ESRCH: # No such process
384
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)
385
247
self.checker = None
386
def still_valid(self):
248
def still_valid(self, now=None):
387
249
"""Has the timeout not yet passed for this client?"""
388
now = datetime.datetime.now()
389
if self.last_checked_ok is None:
250
if now is None:
251
now = datetime.datetime.now()
252
if self.last_seen is None:
390
253
return now < (self.created + self.timeout)
391
254
else:
392
return now < (self.last_checked_ok + self.timeout)
255
return now < (self.last_seen + self.timeout)
393
256
394
257
395
258
def peer_certificate(session):
396
"Return the peer's OpenPGP certificate as a bytestring"
397
259
# If not an OpenPGP certificate...
398
260
if gnutls.library.functions.gnutls_certificate_type_get\
399
261
(session._c_object) \
410
272
411
273
412
274
def fingerprint(openpgp):
413
"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))
414
279
# New GnuTLS "datum" with the OpenPGP public key
415
280
datum = gnutls.library.types.gnutls_datum_t\
416
281
(ctypes.cast(ctypes.c_char_p(openpgp),
417
282
ctypes.POINTER(ctypes.c_ubyte)),
418
283
ctypes.c_uint(len(openpgp)))
419
# New empty GnuTLS certificate
420
crt = gnutls.library.types.gnutls_openpgp_crt_t()
421
gnutls.library.functions.gnutls_openpgp_crt_init\
422
(ctypes.byref(crt))
423
284
# Import the OpenPGP public key into the certificate
424
gnutls.library.functions.gnutls_openpgp_crt_import\
425
(crt, ctypes.byref(datum),
426
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
427
# Verify the self signature in the key
428
crtverify = ctypes.c_uint()
429
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
430
(crt, 0, ctypes.byref(crtverify))
431
if crtverify.value != 0:
432
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
433
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)
434
289
# New buffer for the fingerprint
435
buf = ctypes.create_string_buffer(20)
436
buf_len = ctypes.c_size_t()
290
buffer = ctypes.create_string_buffer(20)
291
buffer_length = ctypes.c_size_t()
437
292
# Get the fingerprint from the certificate into the buffer
438
293
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
439
(crt, ctypes.byref(buf), ctypes.byref(buf_len))
294
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
440
295
# Deinit the certificate
441
296
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
442
297
# Convert the buffer to a Python bytestring
443
fpr = ctypes.string_at(buf, buf_len.value)
298
fpr = ctypes.string_at(buffer, buffer_length.value)
444
299
# Convert the bytestring to hexadecimal notation
445
300
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
446
301
return hex_fpr
447
302
448
303
449
class TCP_handler(SocketServer.BaseRequestHandler, object):
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
450
305
"""A TCP request handler class.
451
306
Instantiated by IPv6_TCPServer for each request to handle it.
452
307
Note: This will run in its own forked process."""
453
308
454
309
def handle(self):
455
logger.info(u"TCP connection from: %s",
456
unicode(self.client_address))
457
session = gnutls.connection.ClientSession\
458
(self.request, gnutls.connection.X509Credentials())
459
460
line = self.request.makefile().readline()
461
logger.debug(u"Protocol version: %r", line)
462
try:
463
if int(line.strip().split()[0]) > 1:
464
raise RuntimeError
465
except (ValueError, IndexError, RuntimeError), error:
466
logger.error(u"Unknown protocol version: %s", error)
467
return
468
469
# Note: gnutls.connection.X509Credentials is really a generic
470
# GnuTLS certificate credentials object so long as no X.509
471
# keys are added to it. Therefore, we can use it here despite
472
# using OpenPGP certificates.
310
logger.debug(u"TCP connection from: %s",
311
unicode(self.client_address))
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
473
315
474
316
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
475
317
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
476
318
# "+DHE-DSS"))
477
# Use a fallback default, since this MUST be set.
478
priority = self.server.settings.get("priority", "NORMAL")
319
priority = "SECURE256"
320
479
321
gnutls.library.functions.gnutls_priority_set_direct\
480
(session._c_object, priority, None)
322
(session._c_object, priority, None);
481
323
482
324
try:
483
325
session.handshake()
484
326
except gnutls.errors.GNUTLSError, error:
485
logger.warning(u"Handshake failed: %s", error)
327
logger.debug(u"Handshake failed: %s", error)
486
328
# Do not run session.bye() here: the session is not
487
329
# established. Just abandon the request.
488
330
return
489
331
try:
490
332
fpr = fingerprint(peer_certificate(session))
491
333
except (TypeError, gnutls.errors.GNUTLSError), error:
492
logger.warning(u"Bad certificate: %s", error)
334
logger.debug(u"Bad certificate: %s", error)
493
335
session.bye()
494
336
return
495
337
logger.debug(u"Fingerprint: %s", fpr)
496
338
client = None
497
for c in self.server.clients:
339
for c in clients:
498
340
if c.fingerprint == fpr:
499
341
client = c
500
342
break
501
if not client:
502
logger.warning(u"Client not found for fingerprint: %s",
503
fpr)
504
session.bye()
505
return
506
343
# Have to check if client.still_valid(), since it is possible
507
344
# that the client timed out while establishing the GnuTLS
508
345
# session.
509
if not client.still_valid():
510
logger.warning(u"Client %(name)s is invalid",
511
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)
512
353
session.bye()
513
354
return
514
## This won't work here, since we're in a fork.
515
# client.bump_timeout()
516
355
sent_size = 0
517
356
while sent_size < len(client.secret):
518
357
sent = session.send(client.secret[sent_size:])
523
362
session.bye()
524
363
525
364
526
class IPv6_TCPServer(SocketServer.ForkingMixIn,
527
SocketServer.TCPServer, object):
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
528
366
"""IPv6 TCP server. Accepts 'None' as address and/or port.
529
367
Attributes:
530
settings: Server settings
368
options: Command line options
531
369
clients: Set() of Client objects
532
enabled: Boolean; whether this server is activated yet
533
370
"""
534
371
address_family = socket.AF_INET6
535
372
def __init__(self, *args, **kwargs):
536
if "settings" in kwargs:
537
self.settings = kwargs["settings"]
538
del kwargs["settings"]
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
539
376
if "clients" in kwargs:
540
377
self.clients = kwargs["clients"]
541
378
del kwargs["clients"]
542
self.enabled = False
543
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
379
return super(type(self), self).__init__(*args, **kwargs)
544
380
def server_bind(self):
545
381
"""This overrides the normal server_bind() function
546
382
to bind to an interface if one was specified, and also NOT to
547
383
bind to an address or port if they were not specified."""
548
if self.settings["interface"]:
549
# 25 is from /usr/include/asm-i486/socket.h
550
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
551
388
try:
552
389
self.socket.setsockopt(socket.SOL_SOCKET,
553
SO_BINDTODEVICE,
554
self.settings["interface"])
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
555
392
except socket.error, error:
556
393
if error[0] == errno.EPERM:
557
logger.error(u"No permission to"
558
u" bind to interface %s",
559
self.settings["interface"])
394
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
560
397
else:
561
398
raise error
562
399
# Only bind(2) the socket if we really need to.
565
402
in6addr_any = "::"
566
403
self.server_address = (in6addr_any,
567
404
self.server_address[1])
568
elif not self.server_address[1]:
405
elif self.server_address[1] is None:
569
406
self.server_address = (self.server_address[0],
570
407
0)
571
# if self.settings["interface"]:
572
# self.server_address = (self.server_address[0],
573
# 0, # port
574
# 0, # flowinfo
575
# if_nametoindex
576
# (self.settings
577
# ["interface"]))
578
return super(IPv6_TCPServer, self).server_bind()
579
def server_activate(self):
580
if self.enabled:
581
return super(IPv6_TCPServer, self).server_activate()
582
def enable(self):
583
self.enabled = True
408
return super(type(self), self).server_bind()
584
409
585
410
586
411
def string_to_delta(interval):
596
421
datetime.timedelta(1)
597
422
>>> string_to_delta(u'1w')
598
423
datetime.timedelta(7)
599
>>> string_to_delta('5m 30s')
600
datetime.timedelta(0, 330)
601
424
"""
602
timevalue = datetime.timedelta(0)
603
for s in interval.split():
604
try:
605
suffix = unicode(s[-1])
606
value = int(s[:-1])
607
if suffix == u"d":
608
delta = datetime.timedelta(value)
609
elif suffix == u"s":
610
delta = datetime.timedelta(0, value)
611
elif suffix == u"m":
612
delta = datetime.timedelta(0, 0, 0, 0, value)
613
elif suffix == u"h":
614
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
615
elif suffix == u"w":
616
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
617
else:
618
raise ValueError
619
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:
620
439
raise ValueError
621
timevalue += delta
622
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()
623
476
624
477
625
478
def server_state_changed(state):
626
"""Derived from the Avahi example code"""
479
"""From the Avahi server example code"""
627
480
if state == avahi.SERVER_COLLISION:
628
logger.error(u"Zeroconf server name collision")
629
service.remove()
481
logger.warning(u"Server name collision")
482
remove_service()
630
483
elif state == avahi.SERVER_RUNNING:
631
service.add()
484
add_service()
632
485
633
486
634
487
def entry_group_state_changed(state, error):
635
"""Derived from the Avahi example code"""
636
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)
637
492
638
493
if state == avahi.ENTRY_GROUP_ESTABLISHED:
639
logger.debug(u"Zeroconf service established.")
494
logger.debug(u"Service established.")
640
495
elif state == avahi.ENTRY_GROUP_COLLISION:
641
logger.warning(u"Zeroconf service name collision.")
642
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()
643
510
elif state == avahi.ENTRY_GROUP_FAILURE:
644
logger.critical(u"Avahi: Error in group state changed %s",
645
unicode(error))
646
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
647
516
648
517
def if_nametoindex(interface):
649
"""Call the C function if_nametoindex(), or equivalent"""
650
global if_nametoindex
518
"""Call the C function if_nametoindex()"""
651
519
try:
652
if_nametoindex = ctypes.cdll.LoadLibrary\
653
(ctypes.util.find_library("c")).if_nametoindex
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
return libc.if_nametoindex(interface)
654
522
except (OSError, AttributeError):
655
523
if "struct" not in sys.modules:
656
524
import struct
657
525
if "fcntl" not in sys.modules:
658
526
import fcntl
659
def if_nametoindex(interface):
660
"Get an interface index the hard way, i.e. using fcntl()"
661
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
662
with closing(socket.socket()) as s:
663
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
664
struct.pack("16s16x", interface))
665
interface_index = struct.unpack("I", ifreq[16:20])[0]
666
return interface_index
667
return if_nametoindex(interface)
668
669
670
def daemon(nochdir = False, noclose = False):
671
"""See daemon(3). Standard BSD Unix function.
672
This should really exist as os.daemon, but it doesn't (yet)."""
673
if os.fork():
674
sys.exit()
675
os.setsid()
676
if not nochdir:
677
os.chdir("/")
678
if os.fork():
679
sys.exit()
680
if not noclose:
681
# Close all standard open file descriptors
682
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
683
if not stat.S_ISCHR(os.fstat(null).st_mode):
684
raise OSError(errno.ENODEV,
685
"/dev/null not a character device")
686
os.dup2(null, sys.stdin.fileno())
687
os.dup2(null, sys.stdout.fileno())
688
os.dup2(null, sys.stderr.fileno())
689
if null > 2:
690
os.close(null)
691
692
693
def main():
694
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()
695
538
parser.add_option("-i", "--interface", type="string",
696
metavar="IF", help="Bind to interface IF")
697
parser.add_option("-a", "--address", type="string",
698
help="Address to listen for requests on")
699
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,
700
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")
701
561
parser.add_option("--check", action="store_true", default=False,
702
562
help="Run self-test")
703
parser.add_option("--debug", action="store_true",
704
help="Debug mode; run in foreground and log to"
705
" terminal")
706
parser.add_option("--priority", type="string", help="GnuTLS"
707
" priority string (see GnuTLS documentation)")
708
parser.add_option("--servicename", type="string", metavar="NAME",
709
help="Zeroconf service name")
710
parser.add_option("--configdir", type="string",
711
default="/etc/mandos", metavar="DIR",
712
help="Directory to search for configuration"
713
" files")
714
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()
715
566
716
567
if options.check:
717
568
import doctest
718
569
doctest.testmod()
719
570
sys.exit()
720
571
721
# Default values for config file for server-global settings
722
server_defaults = { "interface": "",
723
"address": "",
724
"port": "",
725
"debug": "False",
726
"priority":
727
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
728
"servicename": "Mandos",
729
}
730
731
# Parse config file for server-global settings
732
server_config = ConfigParser.SafeConfigParser(server_defaults)
733
del server_defaults
734
server_config.read(os.path.join(options.configdir, "mandos.conf"))
735
# Convert the SafeConfigParser object to a dict
736
server_settings = server_config.defaults()
737
# Use getboolean on the boolean config option
738
server_settings["debug"] = server_config.getboolean\
739
("DEFAULT", "debug")
740
del server_config
741
742
# Override the settings from the config file with command line
743
# options, if set.
744
for option in ("interface", "address", "port", "debug",
745
"priority", "servicename", "configdir"):
746
value = getattr(options, option)
747
if value is not None:
748
server_settings[option] = value
749
del options
750
# Now we have our good server settings in "server_settings"
751
752
debug = server_settings["debug"]
753
754
if not debug:
755
syslogger.setLevel(logging.WARNING)
756
console.setLevel(logging.WARNING)
757
758
if server_settings["servicename"] != "Mandos":
759
syslogger.setFormatter(logging.Formatter\
760
('Mandos (%s): %%(levelname)s:'
761
' %%(message)s'
762
% server_settings["servicename"]))
763
764
# Parse config file with clients
765
client_defaults = { "timeout": "1h",
766
"interval": "5m",
767
"checker": "fping -q -- %(host)s",
768
"host": "",
769
}
770
client_config = ConfigParser.SafeConfigParser(client_defaults)
771
client_config.read(os.path.join(server_settings["configdir"],
772
"clients.conf"))
773
774
clients = Set()
775
tcp_server = IPv6_TCPServer((server_settings["address"],
776
server_settings["port"]),
777
TCP_handler,
778
settings=server_settings,
779
clients=clients)
780
pidfilename = "/var/run/mandos.pid"
781
try:
782
pidfile = open(pidfilename, "w")
783
except IOError, error:
784
logger.error("Could not open file %r", pidfilename)
785
786
uid = 65534
787
gid = 65534
788
try:
789
uid = pwd.getpwnam("mandos").pw_uid
790
except KeyError:
791
try:
792
uid = pwd.getpwnam("nobody").pw_uid
793
except KeyError:
794
pass
795
try:
796
gid = pwd.getpwnam("mandos").pw_gid
797
except KeyError:
798
try:
799
gid = pwd.getpwnam("nogroup").pw_gid
800
except KeyError:
801
pass
802
try:
803
os.setuid(uid)
804
os.setgid(gid)
805
except OSError, error:
806
if error[0] != errno.EPERM:
807
raise error
808
809
global service
810
service = AvahiService(name = server_settings["servicename"],
811
servicetype = "_mandos._tcp", )
812
if server_settings["interface"]:
813
service.interface = if_nametoindex\
814
(server_settings["interface"])
815
816
global main_loop
817
global bus
818
global server
819
# 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
820
589
DBusGMainLoop(set_as_default=True )
821
590
main_loop = gobject.MainLoop()
822
591
bus = dbus.SystemBus()
823
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
824
avahi.DBUS_PATH_SERVER),
825
avahi.DBUS_INTERFACE_SERVER)
592
server = dbus.Interface(
593
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
594
avahi.DBUS_INTERFACE_SERVER )
826
595
# End of Avahi example code
827
596
597
debug = options.debug
598
599
clients = Set()
828
600
def remove_from_clients(client):
829
601
clients.remove(client)
830
602
if not clients:
831
logger.critical(u"No clients left, exiting")
832
sys.exit()
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
833
605
834
clients.update(Set(Client(name = section,
606
clients.update(Set(Client(name=section, options=options,
835
607
stop_hook = remove_from_clients,
836
config
837
= dict(client_config.items(section)))
608
**(dict(client_config\
609
.items(section))))
838
610
for section in client_config.sections()))
839
if not clients:
840
logger.critical(u"No clients defined")
841
sys.exit(1)
842
843
if debug:
844
# Redirect stdin so all checkers get /dev/null
845
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
846
os.dup2(null, sys.stdin.fileno())
847
if null > 2:
848
os.close(null)
849
else:
850
# No console logging
851
logger.removeHandler(console)
852
# Close all input and output, do double fork, etc.
853
daemon()
854
855
try:
856
pid = os.getpid()
857
pidfile.write(str(pid) + "\n")
858
pidfile.close()
859
del pidfile
860
except IOError:
861
logger.error(u"Could not write to file %r with PID %d",
862
pidfilename, pid)
863
except NameError:
864
# "pidfile" was never created
865
pass
866
del pidfilename
867
868
def cleanup():
869
"Cleanup function; run on exit"
870
global group
871
# From the Avahi example code
872
if not group is None:
873
group.Free()
874
group = None
875
# End of Avahi example code
876
877
while clients:
878
client = clients.pop()
879
client.stop_hook = None
880
client.stop()
881
882
atexit.register(cleanup)
883
884
if not debug:
885
signal.signal(signal.SIGINT, signal.SIG_IGN)
886
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
887
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
888
889
611
for client in clients:
890
612
client.start()
891
613
892
tcp_server.enable()
893
tcp_server.server_activate()
894
895
# Find out what port we got
896
service.port = tcp_server.socket.getsockname()[1]
897
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
898
u" scope_id %d" % tcp_server.socket.getsockname())
899
900
#service.interface = tcp_server.socket.getsockname()[3]
901
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)
902
634
try:
903
# From the Avahi example code
904
server.connect_to_signal("StateChanged", server_state_changed)
905
try:
906
server_state_changed(server.GetState())
907
except dbus.exceptions.DBusException, error:
908
logger.critical(u"DBusException: %s", error)
909
sys.exit(1)
910
# End of Avahi example code
911
912
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
913
lambda *args, **kwargs:
914
tcp_server.handle_request\
915
(*args[2:], **kwargs) or True)
916
917
logger.debug(u"Starting main loop")
918
635
main_loop.run()
919
except AvahiError, error:
920
logger.critical(u"AvahiError: %s" + unicode(error))
921
sys.exit(1)
922
636
except KeyboardInterrupt:
923
if debug:
924
print
637
print
638
639
# Cleanup here
925
640
926
if __name__ == '__main__':
927
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