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- Committer: Teddy Hogeborn
- Date: 2008-08-04 20:43:31 UTC
- mfrom: (24.1.17 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080804204331-zgu42g8ii997h1l2
* ca.pem: Removed.
* cert.pem: - '' -
* client-cert.pem: - '' -
* client-key.pem: - '' -
* crl.pem: - '' -
* key.pem: - '' -
* plugins.d/mandosclient.c (start_mandos_communication): Change "to"
to be a union. All users changed.
* server.py: Changed log severity for many log messages.
(Client.__init__): Take all config file settins as a dict instead of
as keyword arguments.
* cert.pem: - '' -
* client-cert.pem: - '' -
* client-key.pem: - '' -
* crl.pem: - '' -
* key.pem: - '' -
* plugins.d/mandosclient.c (start_mandos_communication): Change "to"
to be a union. All users changed.
* server.py: Changed log severity for many log messages.
(Client.__init__): Take all config file settins as a dict instead of
as keyword arguments.
- files added:
- plugbasedclient.c
- plugins.d
- files removed:
- bad-ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- 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
# following functions: "AvahiService.add", "AvahiService.remove",
10
# "server_state_changed", "entry_group_state_changed", and some lines
11
# in "main".
12
#
13
# Everything else is
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
15
#
16
# This program is free software: you can redistribute it and/or modify
17
# it under the terms of the GNU General Public License as published by
18
# the Free Software Foundation, either version 3 of the License, or
19
# (at your option) any later version.
20
#
21
# This program is distributed in the hope that it will be useful,
22
# but WITHOUT ANY WARRANTY; without even the implied warranty of
23
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24
# GNU General Public License for more details.
25
#
26
# You should have received a copy of the GNU General Public License
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
28
#
29
# Contact the authors at <mandos@fukt.bsnet.se>.
30
#
31
32
from __future__ import division
2
33
3
34
import SocketServer
4
35
import socket
9
40
import gnutls.crypto
10
41
import gnutls.connection
11
42
import gnutls.errors
43
import gnutls.library.functions
44
import gnutls.library.constants
45
import gnutls.library.types
12
46
import ConfigParser
47
import sys
48
import re
49
import os
50
import signal
51
from sets import Set
52
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
57
58
import dbus
59
import gobject
60
import avahi
61
from dbus.mainloop.glib import DBusGMainLoop
62
import ctypes
63
64
# Brief description of the operation of this program:
65
#
66
# This server announces itself as a Zeroconf service. Connecting
67
# clients use the TLS protocol, with the unusual quirk that this
68
# server program acts as a TLS "client" while a connecting client acts
69
# as a TLS "server". The client (acting as a TLS "server") must
70
# supply an OpenPGP certificate, and the fingerprint of this
71
# certificate is used by this server to look up (in a list read from a
72
# file at start time) which binary blob to give the client. No other
73
# authentication or authorization is done by this server.
74
75
76
logger = logging.Logger('mandos')
77
syslogger = logging.handlers.SysLogHandler\
78
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
79
syslogger.setFormatter(logging.Formatter\
80
('%(levelname)s: %(message)s'))
81
logger.addHandler(syslogger)
82
del syslogger
83
84
85
class AvahiError(Exception):
86
def __init__(self, value):
87
self.value = value
88
def __str__(self):
89
return repr(self.value)
90
91
class AvahiServiceError(AvahiError):
92
pass
93
94
class AvahiGroupError(AvahiError):
95
pass
96
97
98
class AvahiService(object):
99
"""
100
interface: integer; avahi.IF_UNSPEC or an interface index.
101
Used to optionally bind to the specified interface.
102
name = string; Example: "Mandos"
103
type = string; Example: "_mandos._tcp".
104
See <http://www.dns-sd.org/ServiceTypes.html>
105
port = integer; what port to announce
106
TXT = list of strings; TXT record for the service
107
domain = string; Domain to publish on, default to .local if empty.
108
host = string; Host to publish records for, default to localhost
109
if empty.
110
max_renames = integer; maximum number of renames
111
rename_count = integer; counter so we only rename after collisions
112
a sensible number of times
113
"""
114
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
type = None, port = None, TXT = None, domain = "",
116
host = "", max_renames = 12):
117
"""An Avahi (Zeroconf) service. """
118
self.interface = interface
119
self.name = name
120
self.type = type
121
self.port = port
122
if TXT is None:
123
self.TXT = []
124
else:
125
self.TXT = TXT
126
self.domain = domain
127
self.host = host
128
self.rename_count = 0
129
def rename(self):
130
"""Derived from the Avahi example code"""
131
if self.rename_count >= self.max_renames:
132
logger.critical(u"No suitable service name found after %i"
133
u" retries, exiting.", rename_count)
134
raise AvahiServiceError("Too many renames")
135
name = server.GetAlternativeServiceName(name)
136
logger.error(u"Changing name to %r ...", name)
137
self.remove()
138
self.add()
139
self.rename_count += 1
140
def remove(self):
141
"""Derived from the Avahi example code"""
142
if group is not None:
143
group.Reset()
144
def add(self):
145
"""Derived from the Avahi example code"""
146
global group
147
if group is None:
148
group = dbus.Interface\
149
(bus.get_object(avahi.DBUS_NAME,
150
server.EntryGroupNew()),
151
avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
group.connect_to_signal('StateChanged',
153
entry_group_state_changed)
154
logger.debug(u"Adding service '%s' of type '%s' ...",
155
service.name, service.type)
156
group.AddService(
157
self.interface, # interface
158
avahi.PROTO_INET6, # protocol
159
dbus.UInt32(0), # flags
160
self.name, self.type,
161
self.domain, self.host,
162
dbus.UInt16(self.port),
163
avahi.string_array_to_txt_array(self.TXT))
164
group.Commit()
165
166
# From the Avahi example code:
167
group = None # our entry group
168
# End of Avahi example code
169
13
170
14
171
class Client(object):
15
def __init__(self, name=None, dn=None, password=None,
16
passfile=None, fqdn=None, timeout=None,
17
interval=-1):
172
"""A representation of a client host served by this server.
173
Attributes:
174
name: string; from the config file, used in log messages
175
fingerprint: string (40 or 32 hexadecimal digits); used to
176
uniquely identify the client
177
secret: bytestring; sent verbatim (over TLS) to client
178
fqdn: string (FQDN); available for use by the checker command
179
created: datetime.datetime(); object creation, not client host
180
last_checked_ok: datetime.datetime() or None if not yet checked OK
181
timeout: datetime.timedelta(); How long from last_checked_ok
182
until this client is invalid
183
interval: datetime.timedelta(); How often to start a new checker
184
stop_hook: If set, called by stop() as stop_hook(self)
185
checker: subprocess.Popen(); a running checker process used
186
to see if the client lives.
187
'None' if no process is running.
188
checker_initiator_tag: a gobject event source tag, or None
189
stop_initiator_tag: - '' -
190
checker_callback_tag: - '' -
191
checker_command: string; External command which is run to check if
192
client lives. %() expansions are done at
193
runtime with vars(self) as dict, so that for
194
instance %(name)s can be used in the command.
195
Private attibutes:
196
_timeout: Real variable for 'timeout'
197
_interval: Real variable for 'interval'
198
_timeout_milliseconds: Used when calling gobject.timeout_add()
199
_interval_milliseconds: - '' -
200
"""
201
def _set_timeout(self, timeout):
202
"Setter function for 'timeout' attribute"
203
self._timeout = timeout
204
self._timeout_milliseconds = ((self.timeout.days
205
* 24 * 60 * 60 * 1000)
206
+ (self.timeout.seconds * 1000)
207
+ (self.timeout.microseconds
208
// 1000))
209
timeout = property(lambda self: self._timeout,
210
_set_timeout)
211
del _set_timeout
212
def _set_interval(self, interval):
213
"Setter function for 'interval' attribute"
214
self._interval = interval
215
self._interval_milliseconds = ((self.interval.days
216
* 24 * 60 * 60 * 1000)
217
+ (self.interval.seconds
218
* 1000)
219
+ (self.interval.microseconds
220
// 1000))
221
interval = property(lambda self: self._interval,
222
_set_interval)
223
del _set_interval
224
def __init__(self, name = None, stop_hook=None, config={}):
225
"""Note: the 'checker' argument sets the 'checker_command'
226
attribute and not the 'checker' attribute.."""
18
227
self.name = name
19
self.dn = dn
20
if password:
21
self.password = password
22
elif passfile:
23
self.password = open(passfile).readall()
24
else:
25
print "No Password or Passfile in client config file"
26
# raise RuntimeError XXX
27
self.password = "gazonk"
28
self.fqdn = fqdn
29
# self.created = ...
30
self.last_seen = None
31
if timeout is None:
32
timeout = self.server.options.timeout
33
self.timeout = timeout
34
if interval == -1:
35
interval = self.server.options.interval
36
self.interval = interval
37
38
def server_bind(self):
39
if self.options.interface:
40
if not hasattr(socket, "SO_BINDTODEVICE"):
41
# From /usr/include/asm-i486/socket.h
42
socket.SO_BINDTODEVICE = 25
228
logger.debug(u"Creating client %r", self.name)
229
# Uppercase and remove spaces from fingerprint
230
# for later comparison purposes with return value of
231
# the fingerprint() function
232
self.fingerprint = config["fingerprint"].upper()\
233
.replace(u" ", u"")
234
logger.debug(u" Fingerprint: %s", self.fingerprint)
235
if "secret" in config:
236
self.secret = config["secret"].decode(u"base64")
237
elif "secfile" in config:
238
sf = open(config["secfile"])
239
self.secret = sf.read()
240
sf.close()
241
else:
242
raise TypeError(u"No secret or secfile for client %s"
243
% self.name)
244
self.fqdn = config.get("fqdn", "")
245
self.created = datetime.datetime.now()
246
self.last_checked_ok = None
247
self.timeout = string_to_delta(config["timeout"])
248
self.interval = string_to_delta(config["interval"])
249
self.stop_hook = stop_hook
250
self.checker = None
251
self.checker_initiator_tag = None
252
self.stop_initiator_tag = None
253
self.checker_callback_tag = None
254
self.check_command = config["checker"]
255
def start(self):
256
"""Start this client's checker and timeout hooks"""
257
# Schedule a new checker to be started an 'interval' from now,
258
# and every interval from then on.
259
self.checker_initiator_tag = gobject.timeout_add\
260
(self._interval_milliseconds,
261
self.start_checker)
262
# Also start a new checker *right now*.
263
self.start_checker()
264
# Schedule a stop() when 'timeout' has passed
265
self.stop_initiator_tag = gobject.timeout_add\
266
(self._timeout_milliseconds,
267
self.stop)
268
def stop(self):
269
"""Stop this client.
270
The possibility that a client might be restarted is left open,
271
but not currently used."""
272
# If this client doesn't have a secret, it is already stopped.
273
if self.secret:
274
logger.info(u"Stopping client %s", self.name)
275
self.secret = None
276
else:
277
return False
278
if getattr(self, "stop_initiator_tag", False):
279
gobject.source_remove(self.stop_initiator_tag)
280
self.stop_initiator_tag = None
281
if getattr(self, "checker_initiator_tag", False):
282
gobject.source_remove(self.checker_initiator_tag)
283
self.checker_initiator_tag = None
284
self.stop_checker()
285
if self.stop_hook:
286
self.stop_hook(self)
287
# Do not run this again if called by a gobject.timeout_add
288
return False
289
def __del__(self):
290
self.stop_hook = None
291
self.stop()
292
def checker_callback(self, pid, condition):
293
"""The checker has completed, so take appropriate actions."""
294
now = datetime.datetime.now()
295
self.checker_callback_tag = None
296
self.checker = None
297
if os.WIFEXITED(condition) \
298
and (os.WEXITSTATUS(condition) == 0):
299
logger.info(u"Checker for %(name)s succeeded",
300
vars(self))
301
self.last_checked_ok = now
302
gobject.source_remove(self.stop_initiator_tag)
303
self.stop_initiator_tag = gobject.timeout_add\
304
(self._timeout_milliseconds,
305
self.stop)
306
elif not os.WIFEXITED(condition):
307
logger.warning(u"Checker for %(name)s crashed?",
308
vars(self))
309
else:
310
logger.info(u"Checker for %(name)s failed",
311
vars(self))
312
def start_checker(self):
313
"""Start a new checker subprocess if one is not running.
314
If a checker already exists, leave it running and do
315
nothing."""
316
# The reason for not killing a running checker is that if we
317
# did that, then if a checker (for some reason) started
318
# running slowly and taking more than 'interval' time, the
319
# client would inevitably timeout, since no checker would get
320
# a chance to run to completion. If we instead leave running
321
# checkers alone, the checker would have to take more time
322
# than 'timeout' for the client to be declared invalid, which
323
# is as it should be.
324
if self.checker is None:
325
try:
326
# In case check_command has exactly one % operator
327
command = self.check_command % self.fqdn
328
except TypeError:
329
# Escape attributes for the shell
330
escaped_attrs = dict((key, re.escape(str(val)))
331
for key, val in
332
vars(self).iteritems())
333
try:
334
command = self.check_command % escaped_attrs
335
except TypeError, error:
336
logger.error(u'Could not format string "%s":'
337
u' %s', self.check_command, error)
338
return True # Try again later
339
try:
340
logger.info(u"Starting checker %r for %s",
341
command, self.name)
342
self.checker = subprocess.Popen(command,
343
close_fds=True,
344
shell=True, cwd="/")
345
self.checker_callback_tag = gobject.child_watch_add\
346
(self.checker.pid,
347
self.checker_callback)
348
except subprocess.OSError, error:
349
logger.error(u"Failed to start subprocess: %s",
350
error)
351
# Re-run this periodically if run by gobject.timeout_add
352
return True
353
def stop_checker(self):
354
"""Force the checker process, if any, to stop."""
355
if self.checker_callback_tag:
356
gobject.source_remove(self.checker_callback_tag)
357
self.checker_callback_tag = None
358
if getattr(self, "checker", None) is None:
359
return
360
logger.debug("Stopping checker for %(name)s", vars(self))
43
361
try:
44
self.socket.setsockopt(socket.SOL_SOCKET,
45
socket.SO_BINDTODEVICE,
46
self.options.interface)
47
except socket.error, error:
48
if error[0] == errno.EPERM:
49
print "Warning: Denied permission to bind to interface", \
50
self.options.interface
51
else:
52
raise error
53
return super(type(self), self).server_bind()
54
55
56
def init_with_options(self, *args, **kwargs):
57
if "options" in kwargs:
58
self.options = kwargs["options"]
59
del kwargs["options"]
60
if "clients" in kwargs:
61
self.clients = kwargs["clients"]
62
del kwargs["clients"]
63
if "credentials" in kwargs:
64
self.credentials = kwargs["credentials"]
65
del kwargs["credentials"]
66
return super(type(self), self).__init__(*args, **kwargs)
67
68
69
class udp_handler(SocketServer.DatagramRequestHandler, object):
70
def handle(self):
71
self.wfile.write("Polo")
72
print "UDP request answered"
73
74
75
class IPv6_UDPServer(SocketServer.UDPServer, object):
76
__init__ = init_with_options
77
address_family = socket.AF_INET6
78
allow_reuse_address = True
79
server_bind = server_bind
80
def verify_request(self, request, client_address):
81
print "UDP request came"
82
return request[0] == "Marco"
362
os.kill(self.checker.pid, signal.SIGTERM)
363
#os.sleep(0.5)
364
#if self.checker.poll() is None:
365
# os.kill(self.checker.pid, signal.SIGKILL)
366
except OSError, error:
367
if error.errno != errno.ESRCH: # No such process
368
raise
369
self.checker = None
370
def still_valid(self):
371
"""Has the timeout not yet passed for this client?"""
372
now = datetime.datetime.now()
373
if self.last_checked_ok is None:
374
return now < (self.created + self.timeout)
375
else:
376
return now < (self.last_checked_ok + self.timeout)
377
378
379
def peer_certificate(session):
380
"Return the peer's OpenPGP certificate as a bytestring"
381
# If not an OpenPGP certificate...
382
if gnutls.library.functions.gnutls_certificate_type_get\
383
(session._c_object) \
384
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
385
# ...do the normal thing
386
return session.peer_certificate
387
list_size = ctypes.c_uint()
388
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
389
(session._c_object, ctypes.byref(list_size))
390
if list_size.value == 0:
391
return None
392
cert = cert_list[0]
393
return ctypes.string_at(cert.data, cert.size)
394
395
396
def fingerprint(openpgp):
397
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
398
# New empty GnuTLS certificate
399
crt = gnutls.library.types.gnutls_openpgp_crt_t()
400
gnutls.library.functions.gnutls_openpgp_crt_init\
401
(ctypes.byref(crt))
402
# New GnuTLS "datum" with the OpenPGP public key
403
datum = gnutls.library.types.gnutls_datum_t\
404
(ctypes.cast(ctypes.c_char_p(openpgp),
405
ctypes.POINTER(ctypes.c_ubyte)),
406
ctypes.c_uint(len(openpgp)))
407
# Import the OpenPGP public key into the certificate
408
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
409
(crt,
410
ctypes.byref(datum),
411
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
412
# New buffer for the fingerprint
413
buffer = ctypes.create_string_buffer(20)
414
buffer_length = ctypes.c_size_t()
415
# Get the fingerprint from the certificate into the buffer
416
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
417
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
418
# Deinit the certificate
419
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
420
# Convert the buffer to a Python bytestring
421
fpr = ctypes.string_at(buffer, buffer_length.value)
422
# Convert the bytestring to hexadecimal notation
423
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
424
return hex_fpr
83
425
84
426
85
427
class tcp_handler(SocketServer.BaseRequestHandler, object):
428
"""A TCP request handler class.
429
Instantiated by IPv6_TCPServer for each request to handle it.
430
Note: This will run in its own forked process."""
431
86
432
def handle(self):
87
print "TCP request came"
88
print "Request:", self.request
89
print "Client Address:", self.client_address
90
print "Server:", self.server
91
session = gnutls.connection.ServerSession(self.request,
92
self.server.credentials)
93
session.handshake()
94
if session.peer_certificate:
95
print "DN:", session.peer_certificate.subject
96
try:
97
session.verify_peer()
98
except gnutls.errors.CertificateError, error:
99
print "Verify failed", error
100
session.bye()
101
return
102
try:
103
session.send(dict((client.dn, client.password)
104
for client in self.server.clients)
105
[session.peer_certificate.subject])
106
except KeyError:
107
session.send("gazonk")
108
# Log maybe? XXX
433
logger.info(u"TCP connection from: %s",
434
unicode(self.client_address))
435
session = gnutls.connection.ClientSession\
436
(self.request, gnutls.connection.X509Credentials())
437
438
line = self.request.makefile().readline()
439
logger.debug(u"Protocol version: %r", line)
440
try:
441
if int(line.strip().split()[0]) > 1:
442
raise RuntimeError
443
except (ValueError, IndexError, RuntimeError), error:
444
logger.error(u"Unknown protocol version: %s", error)
445
return
446
447
# Note: gnutls.connection.X509Credentials is really a generic
448
# GnuTLS certificate credentials object so long as no X.509
449
# keys are added to it. Therefore, we can use it here despite
450
# using OpenPGP certificates.
451
452
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
453
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
454
# "+DHE-DSS"))
455
priority = "NORMAL" # Fallback default, since this
456
# MUST be set.
457
if self.server.settings["priority"]:
458
priority = self.server.settings["priority"]
459
gnutls.library.functions.gnutls_priority_set_direct\
460
(session._c_object, priority, None);
461
462
try:
463
session.handshake()
464
except gnutls.errors.GNUTLSError, error:
465
logger.warning(u"Handshake failed: %s", error)
466
# Do not run session.bye() here: the session is not
467
# established. Just abandon the request.
468
return
469
try:
470
fpr = fingerprint(peer_certificate(session))
471
except (TypeError, gnutls.errors.GNUTLSError), error:
472
logger.warning(u"Bad certificate: %s", error)
473
session.bye()
474
return
475
logger.debug(u"Fingerprint: %s", fpr)
476
client = None
477
for c in self.server.clients:
478
if c.fingerprint == fpr:
479
client = c
480
break
481
if not client:
482
logger.warning(u"Client not found for fingerprint: %s",
483
fpr)
484
session.bye()
485
return
486
# Have to check if client.still_valid(), since it is possible
487
# that the client timed out while establishing the GnuTLS
488
# session.
489
if not client.still_valid():
490
logger.warning(u"Client %(name)s is invalid",
491
vars(client))
492
session.bye()
493
return
494
sent_size = 0
495
while sent_size < len(client.secret):
496
sent = session.send(client.secret[sent_size:])
497
logger.debug(u"Sent: %d, remaining: %d",
498
sent, len(client.secret)
499
- (sent_size + sent))
500
sent_size += sent
109
501
session.bye()
110
502
503
111
504
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
112
__init__ = init_with_options
505
"""IPv6 TCP server. Accepts 'None' as address and/or port.
506
Attributes:
507
settings: Server settings
508
clients: Set() of Client objects
509
"""
113
510
address_family = socket.AF_INET6
114
allow_reuse_address = True
115
request_queue_size = 1024
116
server_bind = server_bind
117
118
119
in6addr_any = "::"
120
121
cred = None
511
def __init__(self, *args, **kwargs):
512
if "settings" in kwargs:
513
self.settings = kwargs["settings"]
514
del kwargs["settings"]
515
if "clients" in kwargs:
516
self.clients = kwargs["clients"]
517
del kwargs["clients"]
518
return super(type(self), self).__init__(*args, **kwargs)
519
def server_bind(self):
520
"""This overrides the normal server_bind() function
521
to bind to an interface if one was specified, and also NOT to
522
bind to an address or port if they were not specified."""
523
if self.settings["interface"]:
524
# 25 is from /usr/include/asm-i486/socket.h
525
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
526
try:
527
self.socket.setsockopt(socket.SOL_SOCKET,
528
SO_BINDTODEVICE,
529
self.settings["interface"])
530
except socket.error, error:
531
if error[0] == errno.EPERM:
532
logger.error(u"No permission to"
533
u" bind to interface %s",
534
self.settings["interface"])
535
else:
536
raise error
537
# Only bind(2) the socket if we really need to.
538
if self.server_address[0] or self.server_address[1]:
539
if not self.server_address[0]:
540
in6addr_any = "::"
541
self.server_address = (in6addr_any,
542
self.server_address[1])
543
elif self.server_address[1] is None:
544
self.server_address = (self.server_address[0],
545
0)
546
return super(type(self), self).server_bind()
547
548
549
def string_to_delta(interval):
550
"""Parse a string and return a datetime.timedelta
551
552
>>> string_to_delta('7d')
553
datetime.timedelta(7)
554
>>> string_to_delta('60s')
555
datetime.timedelta(0, 60)
556
>>> string_to_delta('60m')
557
datetime.timedelta(0, 3600)
558
>>> string_to_delta('24h')
559
datetime.timedelta(1)
560
>>> string_to_delta(u'1w')
561
datetime.timedelta(7)
562
"""
563
try:
564
suffix=unicode(interval[-1])
565
value=int(interval[:-1])
566
if suffix == u"d":
567
delta = datetime.timedelta(value)
568
elif suffix == u"s":
569
delta = datetime.timedelta(0, value)
570
elif suffix == u"m":
571
delta = datetime.timedelta(0, 0, 0, 0, value)
572
elif suffix == u"h":
573
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
574
elif suffix == u"w":
575
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
576
else:
577
raise ValueError
578
except (ValueError, IndexError):
579
raise ValueError
580
return delta
581
582
583
def server_state_changed(state):
584
"""Derived from the Avahi example code"""
585
if state == avahi.SERVER_COLLISION:
586
logger.error(u"Server name collision")
587
service.remove()
588
elif state == avahi.SERVER_RUNNING:
589
service.add()
590
591
592
def entry_group_state_changed(state, error):
593
"""Derived from the Avahi example code"""
594
logger.debug(u"state change: %i", state)
595
596
if state == avahi.ENTRY_GROUP_ESTABLISHED:
597
logger.debug(u"Service established.")
598
elif state == avahi.ENTRY_GROUP_COLLISION:
599
logger.warning(u"Service name collision.")
600
service.rename()
601
elif state == avahi.ENTRY_GROUP_FAILURE:
602
logger.critical(u"Error in group state changed %s",
603
unicode(error))
604
raise AvahiGroupError("State changed: %s", str(error))
605
606
def if_nametoindex(interface):
607
"""Call the C function if_nametoindex(), or equivalent"""
608
global if_nametoindex
609
try:
610
if "ctypes.util" not in sys.modules:
611
import ctypes.util
612
if_nametoindex = ctypes.cdll.LoadLibrary\
613
(ctypes.util.find_library("c")).if_nametoindex
614
except (OSError, AttributeError):
615
if "struct" not in sys.modules:
616
import struct
617
if "fcntl" not in sys.modules:
618
import fcntl
619
def if_nametoindex(interface):
620
"Get an interface index the hard way, i.e. using fcntl()"
621
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
622
s = socket.socket()
623
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
624
struct.pack("16s16x", interface))
625
s.close()
626
interface_index = struct.unpack("I", ifreq[16:20])[0]
627
return interface_index
628
return if_nametoindex(interface)
629
630
631
def daemon(nochdir, noclose):
632
"""See daemon(3). Standard BSD Unix function.
633
This should really exist as os.daemon, but it doesn't (yet)."""
634
if os.fork():
635
sys.exit()
636
os.setsid()
637
if not nochdir:
638
os.chdir("/")
639
if not noclose:
640
# Close all standard open file descriptors
641
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
642
if not stat.S_ISCHR(os.fstat(null).st_mode):
643
raise OSError(errno.ENODEV,
644
"/dev/null not a character device")
645
os.dup2(null, sys.stdin.fileno())
646
os.dup2(null, sys.stdout.fileno())
647
os.dup2(null, sys.stderr.fileno())
648
if null > 2:
649
os.close(null)
650
122
651
123
652
def main():
653
global main_loop_started
654
main_loop_started = False
655
124
656
parser = OptionParser()
125
657
parser.add_option("-i", "--interface", type="string",
126
default="eth0", metavar="IF",
127
help="Interface to bind to")
128
parser.add_option("--cert", type="string", default="cert.pem",
129
metavar="FILE",
130
help="Public key certificate to use")
131
parser.add_option("--key", type="string", default="key.pem",
132
metavar="FILE",
133
help="Private key to use")
134
parser.add_option("--ca", type="string", default="ca.pem",
135
metavar="FILE",
136
help="Certificate Authority certificate to use")
137
parser.add_option("--crl", type="string", default="crl.pem",
138
metavar="FILE",
139
help="Certificate Revokation List to use")
140
parser.add_option("-p", "--port", type="int", default=49001,
658
metavar="IF", help="Bind to interface IF")
659
parser.add_option("-a", "--address", type="string",
660
help="Address to listen for requests on")
661
parser.add_option("-p", "--port", type="int",
141
662
help="Port number to receive requests on")
142
parser.add_option("--dh", type="int", metavar="BITS",
143
help="DH group to use")
144
parser.add_option("-t", "--timeout", type="string", # Parsed later
145
default="15m",
146
help="Amount of downtime allowed for clients")
663
parser.add_option("--check", action="store_true", default=False,
664
help="Run self-test")
665
parser.add_option("--debug", action="store_true", default=False,
666
help="Debug mode; run in foreground and log to"
667
" terminal")
668
parser.add_option("--priority", type="string", help="GnuTLS"
669
" priority string (see GnuTLS documentation)")
670
parser.add_option("--servicename", type="string", metavar="NAME",
671
help="Zeroconf service name")
672
parser.add_option("--configdir", type="string",
673
default="/etc/mandos", metavar="DIR",
674
help="Directory to search for configuration"
675
" files")
147
676
(options, args) = parser.parse_args()
148
677
149
# Parse the time argument
150
try:
151
suffix=options.timeout[-1]
152
value=int(options.timeout[:-1])
153
if suffix == "d":
154
options.timeout = datetime.timedelta(value)
155
elif suffix == "s":
156
options.timeout = datetime.timedelta(0, value)
157
elif suffix == "m":
158
options.timeout = datetime.timedelta(0, 0, 0, 0, value)
159
elif suffix == "h":
160
options.timeout = datetime.timedelta(0, 0, 0, 0, 0, value)
161
elif suffix == "w":
162
options.timeout = datetime.timedelta(0, 0, 0, 0, 0, 0,
163
value)
164
else:
165
raise ValueError
166
except (ValueError, IndexError):
167
parser.error("option --timeout: Unparseable time")
168
169
cert = gnutls.crypto.X509Certificate(open(options.cert).read())
170
key = gnutls.crypto.X509PrivateKey(open(options.key).read())
171
ca = gnutls.crypto.X509Certificate(open(options.ca).read())
172
crl = gnutls.crypto.X509CRL(open(options.crl).read())
173
cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
174
175
# Parse config file
176
defaults = {}
177
client_config_object = ConfigParser.SafeConfigParser(defaults)
178
client_config_object.read("mandos-clients.conf")
179
clients = [Client(name=section,
180
**(dict(client_config_object.items(section))))
181
for section in client_config_object.sections()]
182
183
udp_server = IPv6_UDPServer((in6addr_any, options.port),
184
udp_handler,
185
options=options)
186
187
tcp_server = IPv6_TCPServer((in6addr_any, options.port),
678
if options.check:
679
import doctest
680
doctest.testmod()
681
sys.exit()
682
683
# Default values for config file for server-global settings
684
server_defaults = { "interface": "",
685
"address": "",
686
"port": "",
687
"debug": "False",
688
"priority":
689
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
690
"servicename": "Mandos",
691
}
692
693
# Parse config file for server-global settings
694
server_config = ConfigParser.SafeConfigParser(server_defaults)
695
del server_defaults
696
server_config.read(os.path.join(options.configdir, "server.conf"))
697
server_section = "server"
698
# Convert the SafeConfigParser object to a dict
699
server_settings = dict(server_config.items(server_section))
700
# Use getboolean on the boolean config option
701
server_settings["debug"] = server_config.getboolean\
702
(server_section, "debug")
703
del server_config
704
705
# Override the settings from the config file with command line
706
# options, if set.
707
for option in ("interface", "address", "port", "debug",
708
"priority", "servicename", "configdir"):
709
value = getattr(options, option)
710
if value is not None:
711
server_settings[option] = value
712
del options
713
# Now we have our good server settings in "server_settings"
714
715
# Parse config file with clients
716
client_defaults = { "timeout": "1h",
717
"interval": "5m",
718
"checker": "fping -q -- %%(fqdn)s",
719
}
720
client_config = ConfigParser.SafeConfigParser(client_defaults)
721
client_config.read(os.path.join(server_settings["configdir"],
722
"clients.conf"))
723
724
global service
725
service = AvahiService(name = server_settings["servicename"],
726
type = "_mandos._tcp", );
727
if server_settings["interface"]:
728
service.interface = if_nametoindex(server_settings["interface"])
729
730
global main_loop
731
global bus
732
global server
733
# From the Avahi example code
734
DBusGMainLoop(set_as_default=True )
735
main_loop = gobject.MainLoop()
736
bus = dbus.SystemBus()
737
server = dbus.Interface(
738
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
739
avahi.DBUS_INTERFACE_SERVER )
740
# End of Avahi example code
741
742
debug = server_settings["debug"]
743
744
if debug:
745
console = logging.StreamHandler()
746
# console.setLevel(logging.DEBUG)
747
console.setFormatter(logging.Formatter\
748
('%(levelname)s: %(message)s'))
749
logger.addHandler(console)
750
del console
751
752
clients = Set()
753
def remove_from_clients(client):
754
clients.remove(client)
755
if not clients:
756
logger.critical(u"No clients left, exiting")
757
sys.exit()
758
759
clients.update(Set(Client(name = section,
760
stop_hook = remove_from_clients,
761
config
762
= dict(client_config.items(section)))
763
for section in client_config.sections()))
764
765
if not debug:
766
daemon(False, False)
767
768
def cleanup():
769
"Cleanup function; run on exit"
770
global group
771
# From the Avahi example code
772
if not group is None:
773
group.Free()
774
group = None
775
# End of Avahi example code
776
777
while clients:
778
client = clients.pop()
779
client.stop_hook = None
780
client.stop()
781
782
atexit.register(cleanup)
783
784
if not debug:
785
signal.signal(signal.SIGINT, signal.SIG_IGN)
786
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
787
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
788
789
for client in clients:
790
client.start()
791
792
tcp_server = IPv6_TCPServer((server_settings["address"],
793
server_settings["port"]),
188
794
tcp_handler,
189
options=options,
190
clients=clients,
191
credentials=cred)
192
193
while True:
194
in_, out, err = select.select((udp_server,
195
tcp_server), (), ())
196
for server in in_:
197
server.handle_request()
198
199
200
if __name__ == "__main__":
795
settings=server_settings,
796
clients=clients)
797
# Find out what port we got
798
service.port = tcp_server.socket.getsockname()[1]
799
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
800
u" scope_id %d" % tcp_server.socket.getsockname())
801
802
#service.interface = tcp_server.socket.getsockname()[3]
803
804
try:
805
# From the Avahi example code
806
server.connect_to_signal("StateChanged", server_state_changed)
807
try:
808
server_state_changed(server.GetState())
809
except dbus.exceptions.DBusException, error:
810
logger.critical(u"DBusException: %s", error)
811
sys.exit(1)
812
# End of Avahi example code
813
814
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
815
lambda *args, **kwargs:
816
tcp_server.handle_request\
817
(*args[2:], **kwargs) or True)
818
819
logger.debug("Starting main loop")
820
main_loop_started = True
821
main_loop.run()
822
except AvahiError, error:
823
logger.critical(u"AvahiError: %s" + unicode(error))
824
sys.exit(1)
825
except KeyboardInterrupt:
826
if debug:
827
print
828
829
if __name__ == '__main__':
201
830
main()
202
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0