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  • Committer: Teddy Hogeborn
  • Date: 2009-02-13 05:38:21 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090213053821-03e696gckk4nbjps
Support not using IPv6 in server:

* mandos (AvahiService.__init__): Take new "protocol" parameter.  All
                                  callers changed.
  (IPv6_TCPServer.__init__): Take new "use_ipv6" parameter.  All
                             callers changed.
  (IPv6_TCPServer.server_bind): Create IPv4 socket if not using IPv6.
  (main): New "--no-ipv6" command line option.  New "use_ipv6" config
          option.
* mandos-options.xml ([@id="address"]): Document conditional IPv4
                                        address support.
  ([@id="ipv6"]): New paragraph.
* mandos.conf (use_ipv6): New config option.
* mandos.conf.xml (OPTIONS): Document new "use_dbus" option.
  (EXAMPLE): Changed to use IPv6 link-local address.  Added "use_ipv6"
             option.
* mandos.xml (SYNOPSIS): New "--no-ipv6" option.
  (OPTIONS): Document new "--no-ipv6" option.

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mandos
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 © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
 
16
# 
 
17
# This program is free software: you can redistribute it and/or modify
 
18
# it under the terms of the GNU General Public License as published by
 
19
# the Free Software Foundation, either version 3 of the License, or
 
20
# (at your option) any later version.
 
21
#
 
22
#     This program is distributed in the hope that it will be useful,
 
23
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
24
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
25
#     GNU General Public License for more details.
 
26
# 
 
27
# You should have received a copy of the GNU General Public License
 
28
# along with this program.  If not, see
 
29
# <http://www.gnu.org/licenses/>.
 
30
# 
 
31
# Contact the authors at <mandos@fukt.bsnet.se>.
 
32
# 
2
33
 
3
 
from __future__ import division
 
34
from __future__ import division, with_statement, absolute_import
4
35
 
5
36
import SocketServer
6
37
import socket
7
 
import select
8
 
from optparse import OptionParser
 
38
import optparse
9
39
import datetime
10
40
import errno
11
41
import gnutls.crypto
21
51
import signal
22
52
from sets import Set
23
53
import subprocess
 
54
import atexit
 
55
import stat
 
56
import logging
 
57
import logging.handlers
 
58
import pwd
 
59
from contextlib import closing
24
60
 
25
61
import dbus
 
62
import dbus.service
26
63
import gobject
27
64
import avahi
28
65
from dbus.mainloop.glib import DBusGMainLoop
29
66
import ctypes
30
 
 
31
 
import logging
32
 
import logging.handlers
33
 
 
34
 
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
67
import ctypes.util
 
68
 
 
69
version = "1.0.5"
35
70
 
36
71
logger = logging.Logger('mandos')
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
 
72
syslogger = (logging.handlers.SysLogHandler
 
73
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
74
              address = "/dev/log"))
 
75
syslogger.setFormatter(logging.Formatter
 
76
                       ('Mandos [%(process)d]: %(levelname)s:'
 
77
                        ' %(message)s'))
 
78
logger.addHandler(syslogger)
 
79
 
 
80
console = logging.StreamHandler()
 
81
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
 
82
                                       ' %(levelname)s: %(message)s'))
 
83
logger.addHandler(console)
 
84
 
 
85
class AvahiError(Exception):
 
86
    def __init__(self, value, *args, **kwargs):
 
87
        self.value = value
 
88
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
89
    def __unicode__(self):
 
90
        return unicode(repr(self.value))
 
91
 
 
92
class AvahiServiceError(AvahiError):
 
93
    pass
 
94
 
 
95
class AvahiGroupError(AvahiError):
 
96
    pass
 
97
 
 
98
 
 
99
class AvahiService(object):
 
100
    """An Avahi (Zeroconf) service.
 
101
    Attributes:
 
102
    interface: integer; avahi.IF_UNSPEC or an interface index.
 
103
               Used to optionally bind to the specified interface.
 
104
    name: string; Example: 'Mandos'
 
105
    type: string; Example: '_mandos._tcp'.
 
106
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
107
    port: integer; what port to announce
 
108
    TXT: list of strings; TXT record for the service
 
109
    domain: string; Domain to publish on, default to .local if empty.
 
110
    host: string; Host to publish records for, default is localhost
 
111
    max_renames: integer; maximum number of renames
 
112
    rename_count: integer; counter so we only rename after collisions
 
113
                  a sensible number of times
 
114
    """
 
115
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
116
                 servicetype = None, port = None, TXT = None,
 
117
                 domain = "", host = "", max_renames = 32768,
 
118
                 protocol = avahi.PROTO_UNSPEC):
 
119
        self.interface = interface
 
120
        self.name = name
 
121
        self.type = servicetype
 
122
        self.port = port
 
123
        self.TXT = TXT if TXT is not None else []
 
124
        self.domain = domain
 
125
        self.host = host
 
126
        self.rename_count = 0
 
127
        self.max_renames = max_renames
 
128
        self.protocol = protocol
 
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 Zeroconf service name found"
 
133
                            u" after %i retries, exiting.",
 
134
                            self.rename_count)
 
135
            raise AvahiServiceError(u"Too many renames")
 
136
        self.name = server.GetAlternativeServiceName(self.name)
 
137
        logger.info(u"Changing Zeroconf service name to %r ...",
 
138
                    str(self.name))
 
139
        syslogger.setFormatter(logging.Formatter
 
140
                               ('Mandos (%s): %%(levelname)s:'
 
141
                                ' %%(message)s' % self.name))
 
142
        self.remove()
 
143
        self.add()
 
144
        self.rename_count += 1
 
145
    def remove(self):
 
146
        """Derived from the Avahi example code"""
 
147
        if group is not None:
 
148
            group.Reset()
 
149
    def add(self):
 
150
        """Derived from the Avahi example code"""
 
151
        global group
 
152
        if group is None:
 
153
            group = dbus.Interface(bus.get_object
 
154
                                   (avahi.DBUS_NAME,
 
155
                                    server.EntryGroupNew()),
 
156
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
157
            group.connect_to_signal('StateChanged',
 
158
                                    entry_group_state_changed)
 
159
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
160
                     service.name, service.type)
 
161
        group.AddService(
 
162
                self.interface,         # interface
 
163
                self.protocol,          # protocol
 
164
                dbus.UInt32(0),         # flags
 
165
                self.name, self.type,
 
166
                self.domain, self.host,
 
167
                dbus.UInt16(self.port),
 
168
                avahi.string_array_to_txt_array(self.TXT))
 
169
        group.Commit()
 
170
 
 
171
# From the Avahi example code:
 
172
group = None                            # our entry group
53
173
# End of Avahi example code
54
174
 
55
175
 
56
 
class Client(object):
 
176
def _datetime_to_dbus(dt, variant_level=0):
 
177
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
178
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
179
 
 
180
 
 
181
class Client(dbus.service.Object):
57
182
    """A representation of a client host served by this server.
58
183
    Attributes:
59
 
    name:      string; from the config file, used in log messages
 
184
    name:       string; from the config file, used in log messages and
 
185
                        D-Bus identifiers
60
186
    fingerprint: string (40 or 32 hexadecimal digits); used to
61
187
                 uniquely identify the client
62
 
    secret:    bytestring; sent verbatim (over TLS) to client
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
68
 
    interval:  datetime.timedelta(); How often to start a new checker
69
 
    stop_hook: If set, called by stop() as stop_hook(self)
70
 
    checker:   subprocess.Popen(); a running checker process used
71
 
                                   to see if the client lives.
72
 
                                   Is None if no process is running.
 
188
    secret:     bytestring; sent verbatim (over TLS) to client
 
189
    host:       string; available for use by the checker command
 
190
    created:    datetime.datetime(); (UTC) object creation
 
191
    last_enabled: datetime.datetime(); (UTC)
 
192
    enabled:    bool()
 
193
    last_checked_ok: datetime.datetime(); (UTC) or None
 
194
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
195
                                      until this client is invalid
 
196
    interval:   datetime.timedelta(); How often to start a new checker
 
197
    disable_hook:  If set, called by disable() as disable_hook(self)
 
198
    checker:    subprocess.Popen(); a running checker process used
 
199
                                    to see if the client lives.
 
200
                                    'None' if no process is running.
73
201
    checker_initiator_tag: a gobject event source tag, or None
74
 
    stop_initiator_tag:    - '' -
 
202
    disable_initiator_tag:    - '' -
75
203
    checker_callback_tag:  - '' -
76
204
    checker_command: string; External command which is run to check if
77
 
                     client lives.  %()s expansions are done at
 
205
                     client lives.  %() expansions are done at
78
206
                     runtime with vars(self) as dict, so that for
79
207
                     instance %(name)s can be used in the command.
80
 
    Private attibutes:
81
 
    _timeout: Real variable for 'timeout'
82
 
    _interval: Real variable for 'interval'
83
 
    _timeout_milliseconds: Used by gobject.timeout_add()
84
 
    _interval_milliseconds: - '' -
 
208
    use_dbus: bool(); Whether to provide D-Bus interface and signals
 
209
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
85
210
    """
86
 
    def _set_timeout(self, timeout):
87
 
        "Setter function for 'timeout' attribute"
88
 
        self._timeout = timeout
89
 
        self._timeout_milliseconds = ((self.timeout.days
90
 
                                       * 24 * 60 * 60 * 1000)
91
 
                                      + (self.timeout.seconds * 1000)
92
 
                                      + (self.timeout.microseconds
93
 
                                         // 1000))
94
 
    timeout = property(lambda self: self._timeout,
95
 
                       _set_timeout)
96
 
    del _set_timeout
97
 
    def _set_interval(self, interval):
98
 
        "Setter function for 'interval' attribute"
99
 
        self._interval = interval
100
 
        self._interval_milliseconds = ((self.interval.days
101
 
                                        * 24 * 60 * 60 * 1000)
102
 
                                       + (self.interval.seconds
103
 
                                          * 1000)
104
 
                                       + (self.interval.microseconds
105
 
                                          // 1000))
106
 
    interval = property(lambda self: self._interval,
107
 
                        _set_interval)
108
 
    del _set_interval
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):
 
211
    def timeout_milliseconds(self):
 
212
        "Return the 'timeout' attribute in milliseconds"
 
213
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
 
214
                + (self.timeout.seconds * 1000)
 
215
                + (self.timeout.microseconds // 1000))
 
216
    
 
217
    def interval_milliseconds(self):
 
218
        "Return the 'interval' attribute in milliseconds"
 
219
        return ((self.interval.days * 24 * 60 * 60 * 1000)
 
220
                + (self.interval.seconds * 1000)
 
221
                + (self.interval.microseconds // 1000))
 
222
    
 
223
    def __init__(self, name = None, disable_hook=None, config=None,
 
224
                 use_dbus=True):
 
225
        """Note: the 'checker' key in 'config' sets the
 
226
        'checker_command' attribute and *not* the 'checker'
 
227
        attribute."""
112
228
        self.name = name
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()
123
 
        else:
124
 
            raise RuntimeError(u"No secret or secfile for client %s"
125
 
                               % self.name)
126
 
        self.fqdn = fqdn                # string
127
 
        self.created = datetime.datetime.now()
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
137
 
        self.stop_hook = stop_hook
 
229
        if config is None:
 
230
            config = {}
 
231
        logger.debug(u"Creating client %r", self.name)
 
232
        self.use_dbus = False   # During __init__
 
233
        # Uppercase and remove spaces from fingerprint for later
 
234
        # comparison purposes with return value from the fingerprint()
 
235
        # function
 
236
        self.fingerprint = (config["fingerprint"].upper()
 
237
                            .replace(u" ", u""))
 
238
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
239
        if "secret" in config:
 
240
            self.secret = config["secret"].decode(u"base64")
 
241
        elif "secfile" in config:
 
242
            with closing(open(os.path.expanduser
 
243
                              (os.path.expandvars
 
244
                               (config["secfile"])))) as secfile:
 
245
                self.secret = secfile.read()
 
246
        else:
 
247
            raise TypeError(u"No secret or secfile for client %s"
 
248
                            % self.name)
 
249
        self.host = config.get("host", "")
 
250
        self.created = datetime.datetime.utcnow()
 
251
        self.enabled = False
 
252
        self.last_enabled = None
 
253
        self.last_checked_ok = None
 
254
        self.timeout = string_to_delta(config["timeout"])
 
255
        self.interval = string_to_delta(config["interval"])
 
256
        self.disable_hook = disable_hook
138
257
        self.checker = None
139
258
        self.checker_initiator_tag = None
140
 
        self.stop_initiator_tag = None
 
259
        self.disable_initiator_tag = None
141
260
        self.checker_callback_tag = None
142
 
        self.check_command = checker
143
 
    def start(self):
144
 
        """Start this clients checker and timeout hooks"""
 
261
        self.checker_command = config["checker"]
 
262
        self.last_connect = None
 
263
        # Only now, when this client is initialized, can it show up on
 
264
        # the D-Bus
 
265
        self.use_dbus = use_dbus
 
266
        if self.use_dbus:
 
267
            self.dbus_object_path = (dbus.ObjectPath
 
268
                                     ("/clients/"
 
269
                                      + self.name.replace(".", "_")))
 
270
            dbus.service.Object.__init__(self, bus,
 
271
                                         self.dbus_object_path)
 
272
    
 
273
    def enable(self):
 
274
        """Start this client's checker and timeout hooks"""
 
275
        self.last_enabled = datetime.datetime.utcnow()
145
276
        # Schedule a new checker to be started an 'interval' from now,
146
277
        # and every interval from then on.
147
 
        self.checker_initiator_tag = gobject.timeout_add\
148
 
                                     (self._interval_milliseconds,
149
 
                                      self.start_checker)
 
278
        self.checker_initiator_tag = (gobject.timeout_add
 
279
                                      (self.interval_milliseconds(),
 
280
                                       self.start_checker))
150
281
        # Also start a new checker *right now*.
151
282
        self.start_checker()
152
 
        # Schedule a stop() when 'timeout' has passed
153
 
        self.stop_initiator_tag = gobject.timeout_add\
154
 
                                  (self._timeout_milliseconds,
155
 
                                   self.stop)
156
 
    def stop(self):
157
 
        """Stop this client.
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:
163
 
            gobject.source_remove(self.stop_initiator_tag)
164
 
            self.stop_initiator_tag = None
165
 
        if self.checker_initiator_tag:
 
283
        # Schedule a disable() when 'timeout' has passed
 
284
        self.disable_initiator_tag = (gobject.timeout_add
 
285
                                   (self.timeout_milliseconds(),
 
286
                                    self.disable))
 
287
        self.enabled = True
 
288
        if self.use_dbus:
 
289
            # Emit D-Bus signals
 
290
            self.PropertyChanged(dbus.String(u"enabled"),
 
291
                                 dbus.Boolean(True, variant_level=1))
 
292
            self.PropertyChanged(dbus.String(u"last_enabled"),
 
293
                                 (_datetime_to_dbus(self.last_enabled,
 
294
                                                    variant_level=1)))
 
295
    
 
296
    def disable(self):
 
297
        """Disable this client."""
 
298
        if not getattr(self, "enabled", False):
 
299
            return False
 
300
        logger.info(u"Disabling client %s", self.name)
 
301
        if getattr(self, "disable_initiator_tag", False):
 
302
            gobject.source_remove(self.disable_initiator_tag)
 
303
            self.disable_initiator_tag = None
 
304
        if getattr(self, "checker_initiator_tag", False):
166
305
            gobject.source_remove(self.checker_initiator_tag)
167
306
            self.checker_initiator_tag = None
168
307
        self.stop_checker()
169
 
        if self.stop_hook:
170
 
            self.stop_hook(self)
 
308
        if self.disable_hook:
 
309
            self.disable_hook(self)
 
310
        self.enabled = False
 
311
        if self.use_dbus:
 
312
            # Emit D-Bus signal
 
313
            self.PropertyChanged(dbus.String(u"enabled"),
 
314
                                 dbus.Boolean(False, variant_level=1))
171
315
        # Do not run this again if called by a gobject.timeout_add
172
316
        return False
 
317
    
173
318
    def __del__(self):
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()
184
 
    def checker_callback(self, pid, condition):
 
319
        self.disable_hook = None
 
320
        self.disable()
 
321
    
 
322
    def checker_callback(self, pid, condition, command):
185
323
        """The checker has completed, so take appropriate actions."""
186
 
        now = datetime.datetime.now()
187
 
        if os.WIFEXITED(condition) \
188
 
               and (os.WEXITSTATUS(condition) == 0):
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):
 
324
        self.checker_callback_tag = None
 
325
        self.checker = None
 
326
        if self.use_dbus:
 
327
            # Emit D-Bus signal
 
328
            self.PropertyChanged(dbus.String(u"checker_running"),
 
329
                                 dbus.Boolean(False, variant_level=1))
 
330
        if os.WIFEXITED(condition):
 
331
            exitstatus = os.WEXITSTATUS(condition)
 
332
            if exitstatus == 0:
 
333
                logger.info(u"Checker for %(name)s succeeded",
 
334
                            vars(self))
 
335
                self.checked_ok()
 
336
            else:
 
337
                logger.info(u"Checker for %(name)s failed",
 
338
                            vars(self))
 
339
            if self.use_dbus:
 
340
                # Emit D-Bus signal
 
341
                self.CheckerCompleted(dbus.Int16(exitstatus),
 
342
                                      dbus.Int64(condition),
 
343
                                      dbus.String(command))
 
344
        else:
197
345
            logger.warning(u"Checker for %(name)s crashed?",
198
346
                           vars(self))
199
 
        else:
200
 
            logger.debug(u"Checker for %(name)s failed",
201
 
                         vars(self))
202
 
            self.checker = None
203
 
        self.checker_callback_tag = None
 
347
            if self.use_dbus:
 
348
                # Emit D-Bus signal
 
349
                self.CheckerCompleted(dbus.Int16(-1),
 
350
                                      dbus.Int64(condition),
 
351
                                      dbus.String(command))
 
352
    
 
353
    def checked_ok(self):
 
354
        """Bump up the timeout for this client.
 
355
        This should only be called when the client has been seen,
 
356
        alive and well.
 
357
        """
 
358
        self.last_checked_ok = datetime.datetime.utcnow()
 
359
        gobject.source_remove(self.disable_initiator_tag)
 
360
        self.disable_initiator_tag = (gobject.timeout_add
 
361
                                      (self.timeout_milliseconds(),
 
362
                                       self.disable))
 
363
        if self.use_dbus:
 
364
            # Emit D-Bus signal
 
365
            self.PropertyChanged(
 
366
                dbus.String(u"last_checked_ok"),
 
367
                (_datetime_to_dbus(self.last_checked_ok,
 
368
                                   variant_level=1)))
 
369
    
204
370
    def start_checker(self):
205
371
        """Start a new checker subprocess if one is not running.
206
372
        If a checker already exists, leave it running and do
207
373
        nothing."""
 
374
        # The reason for not killing a running checker is that if we
 
375
        # did that, then if a checker (for some reason) started
 
376
        # running slowly and taking more than 'interval' time, the
 
377
        # client would inevitably timeout, since no checker would get
 
378
        # a chance to run to completion.  If we instead leave running
 
379
        # checkers alone, the checker would have to take more time
 
380
        # than 'timeout' for the client to be declared invalid, which
 
381
        # is as it should be.
208
382
        if self.checker is None:
209
 
            logger.debug(u"Starting checker for %s",
210
 
                         self.name)
211
383
            try:
212
 
                command = self.check_command % self.fqdn
 
384
                # In case checker_command has exactly one % operator
 
385
                command = self.checker_command % self.host
213
386
            except TypeError:
 
387
                # Escape attributes for the shell
214
388
                escaped_attrs = dict((key, re.escape(str(val)))
215
389
                                     for key, val in
216
390
                                     vars(self).iteritems())
217
391
                try:
218
 
                    command = self.check_command % escaped_attrs
 
392
                    command = self.checker_command % escaped_attrs
219
393
                except TypeError, error:
220
 
                    logger.critical(u'Could not format string "%s": %s',
221
 
                                    self.check_command, error)
 
394
                    logger.error(u'Could not format string "%s":'
 
395
                                 u' %s', self.checker_command, error)
222
396
                    return True # Try again later
223
397
            try:
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:
 
398
                logger.info(u"Starting checker %r for %s",
 
399
                            command, self.name)
 
400
                # We don't need to redirect stdout and stderr, since
 
401
                # in normal mode, that is already done by daemon(),
 
402
                # and in debug mode we don't want to.  (Stdin is
 
403
                # always replaced by /dev/null.)
 
404
                self.checker = subprocess.Popen(command,
 
405
                                                close_fds=True,
 
406
                                                shell=True, cwd="/")
 
407
                if self.use_dbus:
 
408
                    # Emit D-Bus signal
 
409
                    self.CheckerStarted(command)
 
410
                    self.PropertyChanged(
 
411
                        dbus.String("checker_running"),
 
412
                        dbus.Boolean(True, variant_level=1))
 
413
                self.checker_callback_tag = (gobject.child_watch_add
 
414
                                             (self.checker.pid,
 
415
                                              self.checker_callback,
 
416
                                              data=command))
 
417
                # The checker may have completed before the gobject
 
418
                # watch was added.  Check for this.
 
419
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
420
                if pid:
 
421
                    gobject.source_remove(self.checker_callback_tag)
 
422
                    self.checker_callback(pid, status, command)
 
423
            except OSError, error:
234
424
                logger.error(u"Failed to start subprocess: %s",
235
425
                             error)
236
426
        # Re-run this periodically if run by gobject.timeout_add
237
427
        return True
 
428
    
238
429
    def stop_checker(self):
239
430
        """Force the checker process, if any, to stop."""
240
 
        if not hasattr(self, "checker") or self.checker is None:
 
431
        if self.checker_callback_tag:
 
432
            gobject.source_remove(self.checker_callback_tag)
 
433
            self.checker_callback_tag = None
 
434
        if getattr(self, "checker", None) is None:
241
435
            return
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)
 
436
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
437
        try:
 
438
            os.kill(self.checker.pid, signal.SIGTERM)
 
439
            #os.sleep(0.5)
 
440
            #if self.checker.poll() is None:
 
441
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
442
        except OSError, error:
 
443
            if error.errno != errno.ESRCH: # No such process
 
444
                raise
247
445
        self.checker = None
248
 
    def still_valid(self, now=None):
 
446
        if self.use_dbus:
 
447
            self.PropertyChanged(dbus.String(u"checker_running"),
 
448
                                 dbus.Boolean(False, variant_level=1))
 
449
    
 
450
    def still_valid(self):
249
451
        """Has the timeout not yet passed for this client?"""
250
 
        if now is None:
251
 
            now = datetime.datetime.now()
252
 
        if self.last_seen is None:
 
452
        if not getattr(self, "enabled", False):
 
453
            return False
 
454
        now = datetime.datetime.utcnow()
 
455
        if self.last_checked_ok is None:
253
456
            return now < (self.created + self.timeout)
254
457
        else:
255
 
            return now < (self.last_seen + self.timeout)
 
458
            return now < (self.last_checked_ok + self.timeout)
 
459
    
 
460
    ## D-Bus methods & signals
 
461
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
462
    
 
463
    # CheckedOK - method
 
464
    CheckedOK = dbus.service.method(_interface)(checked_ok)
 
465
    CheckedOK.__name__ = "CheckedOK"
 
466
    
 
467
    # CheckerCompleted - signal
 
468
    @dbus.service.signal(_interface, signature="nxs")
 
469
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
470
        "D-Bus signal"
 
471
        pass
 
472
    
 
473
    # CheckerStarted - signal
 
474
    @dbus.service.signal(_interface, signature="s")
 
475
    def CheckerStarted(self, command):
 
476
        "D-Bus signal"
 
477
        pass
 
478
    
 
479
    # GetAllProperties - method
 
480
    @dbus.service.method(_interface, out_signature="a{sv}")
 
481
    def GetAllProperties(self):
 
482
        "D-Bus method"
 
483
        return dbus.Dictionary({
 
484
                dbus.String("name"):
 
485
                    dbus.String(self.name, variant_level=1),
 
486
                dbus.String("fingerprint"):
 
487
                    dbus.String(self.fingerprint, variant_level=1),
 
488
                dbus.String("host"):
 
489
                    dbus.String(self.host, variant_level=1),
 
490
                dbus.String("created"):
 
491
                    _datetime_to_dbus(self.created, variant_level=1),
 
492
                dbus.String("last_enabled"):
 
493
                    (_datetime_to_dbus(self.last_enabled,
 
494
                                       variant_level=1)
 
495
                     if self.last_enabled is not None
 
496
                     else dbus.Boolean(False, variant_level=1)),
 
497
                dbus.String("enabled"):
 
498
                    dbus.Boolean(self.enabled, variant_level=1),
 
499
                dbus.String("last_checked_ok"):
 
500
                    (_datetime_to_dbus(self.last_checked_ok,
 
501
                                       variant_level=1)
 
502
                     if self.last_checked_ok is not None
 
503
                     else dbus.Boolean (False, variant_level=1)),
 
504
                dbus.String("timeout"):
 
505
                    dbus.UInt64(self.timeout_milliseconds(),
 
506
                                variant_level=1),
 
507
                dbus.String("interval"):
 
508
                    dbus.UInt64(self.interval_milliseconds(),
 
509
                                variant_level=1),
 
510
                dbus.String("checker"):
 
511
                    dbus.String(self.checker_command,
 
512
                                variant_level=1),
 
513
                dbus.String("checker_running"):
 
514
                    dbus.Boolean(self.checker is not None,
 
515
                                 variant_level=1),
 
516
                dbus.String("object_path"):
 
517
                    dbus.ObjectPath(self.dbus_object_path,
 
518
                                    variant_level=1)
 
519
                }, signature="sv")
 
520
    
 
521
    # IsStillValid - method
 
522
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
 
523
                    (still_valid))
 
524
    IsStillValid.__name__ = "IsStillValid"
 
525
    
 
526
    # PropertyChanged - signal
 
527
    @dbus.service.signal(_interface, signature="sv")
 
528
    def PropertyChanged(self, property, value):
 
529
        "D-Bus signal"
 
530
        pass
 
531
    
 
532
    # SetChecker - method
 
533
    @dbus.service.method(_interface, in_signature="s")
 
534
    def SetChecker(self, checker):
 
535
        "D-Bus setter method"
 
536
        self.checker_command = checker
 
537
        # Emit D-Bus signal
 
538
        self.PropertyChanged(dbus.String(u"checker"),
 
539
                             dbus.String(self.checker_command,
 
540
                                         variant_level=1))
 
541
    
 
542
    # SetHost - method
 
543
    @dbus.service.method(_interface, in_signature="s")
 
544
    def SetHost(self, host):
 
545
        "D-Bus setter method"
 
546
        self.host = host
 
547
        # Emit D-Bus signal
 
548
        self.PropertyChanged(dbus.String(u"host"),
 
549
                             dbus.String(self.host, variant_level=1))
 
550
    
 
551
    # SetInterval - method
 
552
    @dbus.service.method(_interface, in_signature="t")
 
553
    def SetInterval(self, milliseconds):
 
554
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
 
555
        # Emit D-Bus signal
 
556
        self.PropertyChanged(dbus.String(u"interval"),
 
557
                             (dbus.UInt64(self.interval_milliseconds(),
 
558
                                          variant_level=1)))
 
559
    
 
560
    # SetSecret - method
 
561
    @dbus.service.method(_interface, in_signature="ay",
 
562
                         byte_arrays=True)
 
563
    def SetSecret(self, secret):
 
564
        "D-Bus setter method"
 
565
        self.secret = str(secret)
 
566
    
 
567
    # SetTimeout - method
 
568
    @dbus.service.method(_interface, in_signature="t")
 
569
    def SetTimeout(self, milliseconds):
 
570
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
571
        # Emit D-Bus signal
 
572
        self.PropertyChanged(dbus.String(u"timeout"),
 
573
                             (dbus.UInt64(self.timeout_milliseconds(),
 
574
                                          variant_level=1)))
 
575
    
 
576
    # Enable - method
 
577
    Enable = dbus.service.method(_interface)(enable)
 
578
    Enable.__name__ = "Enable"
 
579
    
 
580
    # StartChecker - method
 
581
    @dbus.service.method(_interface)
 
582
    def StartChecker(self):
 
583
        "D-Bus method"
 
584
        self.start_checker()
 
585
    
 
586
    # Disable - method
 
587
    @dbus.service.method(_interface)
 
588
    def Disable(self):
 
589
        "D-Bus method"
 
590
        self.disable()
 
591
    
 
592
    # StopChecker - method
 
593
    StopChecker = dbus.service.method(_interface)(stop_checker)
 
594
    StopChecker.__name__ = "StopChecker"
 
595
    
 
596
    del _interface
256
597
 
257
598
 
258
599
def peer_certificate(session):
 
600
    "Return the peer's OpenPGP certificate as a bytestring"
259
601
    # If not an OpenPGP certificate...
260
 
    if gnutls.library.functions.gnutls_certificate_type_get\
261
 
            (session._c_object) \
262
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
602
    if (gnutls.library.functions
 
603
        .gnutls_certificate_type_get(session._c_object)
 
604
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
263
605
        # ...do the normal thing
264
606
        return session.peer_certificate
265
 
    list_size = ctypes.c_uint()
266
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
267
 
        (session._c_object, ctypes.byref(list_size))
 
607
    list_size = ctypes.c_uint(1)
 
608
    cert_list = (gnutls.library.functions
 
609
                 .gnutls_certificate_get_peers
 
610
                 (session._c_object, ctypes.byref(list_size)))
 
611
    if not bool(cert_list) and list_size.value != 0:
 
612
        raise gnutls.errors.GNUTLSError("error getting peer"
 
613
                                        " certificate")
268
614
    if list_size.value == 0:
269
615
        return None
270
616
    cert = cert_list[0]
272
618
 
273
619
 
274
620
def fingerprint(openpgp):
 
621
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
622
    # New GnuTLS "datum" with the OpenPGP public key
 
623
    datum = (gnutls.library.types
 
624
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
625
                                         ctypes.POINTER
 
626
                                         (ctypes.c_ubyte)),
 
627
                             ctypes.c_uint(len(openpgp))))
275
628
    # New empty GnuTLS certificate
276
629
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
277
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
278
 
        (ctypes.byref(crt))
279
 
    # New GnuTLS "datum" with the OpenPGP public key
280
 
    datum = gnutls.library.types.gnutls_datum_t\
281
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
282
 
                     ctypes.POINTER(ctypes.c_ubyte)),
283
 
         ctypes.c_uint(len(openpgp)))
 
630
    (gnutls.library.functions
 
631
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
284
632
    # Import the OpenPGP public key into the certificate
285
 
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
 
        (crt,
287
 
         ctypes.byref(datum),
288
 
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
633
    (gnutls.library.functions
 
634
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
635
                                gnutls.library.constants
 
636
                                .GNUTLS_OPENPGP_FMT_RAW))
 
637
    # Verify the self signature in the key
 
638
    crtverify = ctypes.c_uint()
 
639
    (gnutls.library.functions
 
640
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
641
    if crtverify.value != 0:
 
642
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
643
        raise gnutls.errors.CertificateSecurityError("Verify failed")
289
644
    # New buffer for the fingerprint
290
 
    buffer = ctypes.create_string_buffer(20)
291
 
    buffer_length = ctypes.c_size_t()
 
645
    buf = ctypes.create_string_buffer(20)
 
646
    buf_len = ctypes.c_size_t()
292
647
    # Get the fingerprint from the certificate into the buffer
293
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
294
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
648
    (gnutls.library.functions
 
649
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
650
                                         ctypes.byref(buf_len)))
295
651
    # Deinit the certificate
296
652
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
297
653
    # Convert the buffer to a Python bytestring
298
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
654
    fpr = ctypes.string_at(buf, buf_len.value)
299
655
    # Convert the bytestring to hexadecimal notation
300
656
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
301
657
    return hex_fpr
302
658
 
303
659
 
304
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
660
class TCP_handler(SocketServer.BaseRequestHandler, object):
305
661
    """A TCP request handler class.
306
662
    Instantiated by IPv6_TCPServer for each request to handle it.
307
663
    Note: This will run in its own forked process."""
308
664
    
309
665
    def handle(self):
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())
 
666
        logger.info(u"TCP connection from: %s",
 
667
                    unicode(self.client_address))
 
668
        session = (gnutls.connection
 
669
                   .ClientSession(self.request,
 
670
                                  gnutls.connection
 
671
                                  .X509Credentials()))
 
672
        
 
673
        line = self.request.makefile().readline()
 
674
        logger.debug(u"Protocol version: %r", line)
 
675
        try:
 
676
            if int(line.strip().split()[0]) > 1:
 
677
                raise RuntimeError
 
678
        except (ValueError, IndexError, RuntimeError), error:
 
679
            logger.error(u"Unknown protocol version: %s", error)
 
680
            return
 
681
        
 
682
        # Note: gnutls.connection.X509Credentials is really a generic
 
683
        # GnuTLS certificate credentials object so long as no X.509
 
684
        # keys are added to it.  Therefore, we can use it here despite
 
685
        # using OpenPGP certificates.
315
686
        
316
687
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
317
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
318
 
        #                "+DHE-DSS"))
319
 
        priority = "SECURE256"
320
 
        
321
 
        gnutls.library.functions.gnutls_priority_set_direct\
322
 
            (session._c_object, priority, None);
 
688
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
689
        #                     "+DHE-DSS"))
 
690
        # Use a fallback default, since this MUST be set.
 
691
        priority = self.server.settings.get("priority", "NORMAL")
 
692
        (gnutls.library.functions
 
693
         .gnutls_priority_set_direct(session._c_object,
 
694
                                     priority, None))
323
695
        
324
696
        try:
325
697
            session.handshake()
326
698
        except gnutls.errors.GNUTLSError, error:
327
 
            logger.debug(u"Handshake failed: %s", error)
 
699
            logger.warning(u"Handshake failed: %s", error)
328
700
            # Do not run session.bye() here: the session is not
329
701
            # established.  Just abandon the request.
330
702
            return
 
703
        logger.debug(u"Handshake succeeded")
331
704
        try:
332
705
            fpr = fingerprint(peer_certificate(session))
333
706
        except (TypeError, gnutls.errors.GNUTLSError), error:
334
 
            logger.debug(u"Bad certificate: %s", error)
 
707
            logger.warning(u"Bad certificate: %s", error)
335
708
            session.bye()
336
709
            return
337
710
        logger.debug(u"Fingerprint: %s", fpr)
338
 
        client = None
339
 
        for c in clients:
 
711
        
 
712
        for c in self.server.clients:
340
713
            if c.fingerprint == fpr:
341
714
                client = c
342
715
                break
 
716
        else:
 
717
            logger.warning(u"Client not found for fingerprint: %s",
 
718
                           fpr)
 
719
            session.bye()
 
720
            return
343
721
        # Have to check if client.still_valid(), since it is possible
344
722
        # that the client timed out while establishing the GnuTLS
345
723
        # session.
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)
 
724
        if not client.still_valid():
 
725
            logger.warning(u"Client %(name)s is invalid",
 
726
                           vars(client))
353
727
            session.bye()
354
728
            return
 
729
        ## This won't work here, since we're in a fork.
 
730
        # client.checked_ok()
355
731
        sent_size = 0
356
732
        while sent_size < len(client.secret):
357
733
            sent = session.send(client.secret[sent_size:])
362
738
        session.bye()
363
739
 
364
740
 
365
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
741
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
742
                     SocketServer.TCPServer, object):
 
743
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port.
367
744
    Attributes:
368
 
        options:        Command line options
 
745
        settings:       Server settings
369
746
        clients:        Set() of Client objects
 
747
        enabled:        Boolean; whether this server is activated yet
370
748
    """
371
749
    address_family = socket.AF_INET6
372
750
    def __init__(self, *args, **kwargs):
373
 
        if "options" in kwargs:
374
 
            self.options = kwargs["options"]
375
 
            del kwargs["options"]
 
751
        if "settings" in kwargs:
 
752
            self.settings = kwargs["settings"]
 
753
            del kwargs["settings"]
376
754
        if "clients" in kwargs:
377
755
            self.clients = kwargs["clients"]
378
756
            del kwargs["clients"]
379
 
        return super(type(self), self).__init__(*args, **kwargs)
 
757
        if "use_ipv6" in kwargs:
 
758
            if not kwargs["use_ipv6"]:
 
759
                self.address_family = socket.AF_INET
 
760
            del kwargs["use_ipv6"]
 
761
        self.enabled = False
 
762
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
380
763
    def server_bind(self):
381
764
        """This overrides the normal server_bind() function
382
765
        to bind to an interface if one was specified, and also NOT to
383
766
        bind to an address or port if they were not specified."""
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
 
767
        if self.settings["interface"]:
 
768
            # 25 is from /usr/include/asm-i486/socket.h
 
769
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
388
770
            try:
389
771
                self.socket.setsockopt(socket.SOL_SOCKET,
390
 
                                       socket.SO_BINDTODEVICE,
391
 
                                       self.options.interface)
 
772
                                       SO_BINDTODEVICE,
 
773
                                       self.settings["interface"])
392
774
            except socket.error, error:
393
775
                if error[0] == errno.EPERM:
394
 
                    logger.warning(u"No permission to"
395
 
                                   u" bind to interface %s",
396
 
                                   self.options.interface)
 
776
                    logger.error(u"No permission to"
 
777
                                 u" bind to interface %s",
 
778
                                 self.settings["interface"])
397
779
                else:
398
 
                    raise error
 
780
                    raise
399
781
        # Only bind(2) the socket if we really need to.
400
782
        if self.server_address[0] or self.server_address[1]:
401
783
            if not self.server_address[0]:
402
 
                in6addr_any = "::"
403
 
                self.server_address = (in6addr_any,
 
784
                if self.address_family == socket.AF_INET6:
 
785
                    any_address = "::" # in6addr_any
 
786
                else:
 
787
                    any_address = socket.INADDR_ANY
 
788
                self.server_address = (any_address,
404
789
                                       self.server_address[1])
405
 
            elif self.server_address[1] is None:
 
790
            elif not self.server_address[1]:
406
791
                self.server_address = (self.server_address[0],
407
792
                                       0)
408
 
            return super(type(self), self).server_bind()
 
793
#                 if self.settings["interface"]:
 
794
#                     self.server_address = (self.server_address[0],
 
795
#                                            0, # port
 
796
#                                            0, # flowinfo
 
797
#                                            if_nametoindex
 
798
#                                            (self.settings
 
799
#                                             ["interface"]))
 
800
            return super(IPv6_TCPServer, self).server_bind()
 
801
    def server_activate(self):
 
802
        if self.enabled:
 
803
            return super(IPv6_TCPServer, self).server_activate()
 
804
    def enable(self):
 
805
        self.enabled = True
409
806
 
410
807
 
411
808
def string_to_delta(interval):
412
809
    """Parse a string and return a datetime.timedelta
413
 
 
 
810
    
414
811
    >>> string_to_delta('7d')
415
812
    datetime.timedelta(7)
416
813
    >>> string_to_delta('60s')
421
818
    datetime.timedelta(1)
422
819
    >>> string_to_delta(u'1w')
423
820
    datetime.timedelta(7)
 
821
    >>> string_to_delta('5m 30s')
 
822
    datetime.timedelta(0, 330)
424
823
    """
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:
 
824
    timevalue = datetime.timedelta(0)
 
825
    for s in interval.split():
 
826
        try:
 
827
            suffix = unicode(s[-1])
 
828
            value = int(s[:-1])
 
829
            if suffix == u"d":
 
830
                delta = datetime.timedelta(value)
 
831
            elif suffix == u"s":
 
832
                delta = datetime.timedelta(0, value)
 
833
            elif suffix == u"m":
 
834
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
835
            elif suffix == u"h":
 
836
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
837
            elif suffix == u"w":
 
838
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
839
            else:
 
840
                raise ValueError
 
841
        except (ValueError, IndexError):
439
842
            raise ValueError
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()
 
843
        timevalue += delta
 
844
    return timevalue
476
845
 
477
846
 
478
847
def server_state_changed(state):
479
 
    """From the Avahi server example code"""
 
848
    """Derived from the Avahi example code"""
480
849
    if state == avahi.SERVER_COLLISION:
481
 
        logger.warning(u"Server name collision")
482
 
        remove_service()
 
850
        logger.error(u"Zeroconf server name collision")
 
851
        service.remove()
483
852
    elif state == avahi.SERVER_RUNNING:
484
 
        add_service()
 
853
        service.add()
485
854
 
486
855
 
487
856
def entry_group_state_changed(state, error):
488
 
    """From the Avahi server example code"""
489
 
    global serviceName, server, rename_count
490
 
    
491
 
    logger.debug(u"state change: %i", state)
 
857
    """Derived from the Avahi example code"""
 
858
    logger.debug(u"Avahi state change: %i", state)
492
859
    
493
860
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
494
 
        logger.debug(u"Service established.")
 
861
        logger.debug(u"Zeroconf service established.")
495
862
    elif state == avahi.ENTRY_GROUP_COLLISION:
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()
 
863
        logger.warning(u"Zeroconf service name collision.")
 
864
        service.rename()
510
865
    elif state == avahi.ENTRY_GROUP_FAILURE:
511
 
        logger.error(u"Error in group state changed %s",
512
 
                     unicode(error))
513
 
        main_loop.quit()
514
 
        return
515
 
 
 
866
        logger.critical(u"Avahi: Error in group state changed %s",
 
867
                        unicode(error))
 
868
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
516
869
 
517
870
def if_nametoindex(interface):
518
 
    """Call the C function if_nametoindex()"""
 
871
    """Call the C function if_nametoindex(), or equivalent"""
 
872
    global if_nametoindex
519
873
    try:
520
 
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
 
        return libc.if_nametoindex(interface)
 
874
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
875
                          (ctypes.util.find_library("c"))
 
876
                          .if_nametoindex)
522
877
    except (OSError, AttributeError):
523
878
        if "struct" not in sys.modules:
524
879
            import struct
525
880
        if "fcntl" not in sys.modules:
526
881
            import fcntl
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()
 
882
        def if_nametoindex(interface):
 
883
            "Get an interface index the hard way, i.e. using fcntl()"
 
884
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
885
            with closing(socket.socket()) as s:
 
886
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
887
                                    struct.pack("16s16x", interface))
 
888
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
889
            return interface_index
 
890
    return if_nametoindex(interface)
 
891
 
 
892
 
 
893
def daemon(nochdir = False, noclose = False):
 
894
    """See daemon(3).  Standard BSD Unix function.
 
895
    This should really exist as os.daemon, but it doesn't (yet)."""
 
896
    if os.fork():
 
897
        sys.exit()
 
898
    os.setsid()
 
899
    if not nochdir:
 
900
        os.chdir("/")
 
901
    if os.fork():
 
902
        sys.exit()
 
903
    if not noclose:
 
904
        # Close all standard open file descriptors
 
905
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
906
        if not stat.S_ISCHR(os.fstat(null).st_mode):
 
907
            raise OSError(errno.ENODEV,
 
908
                          "/dev/null not a character device")
 
909
        os.dup2(null, sys.stdin.fileno())
 
910
        os.dup2(null, sys.stdout.fileno())
 
911
        os.dup2(null, sys.stderr.fileno())
 
912
        if null > 2:
 
913
            os.close(null)
 
914
 
 
915
 
 
916
def main():
 
917
    parser = optparse.OptionParser(version = "%%prog %s" % version)
538
918
    parser.add_option("-i", "--interface", type="string",
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,
 
919
                      metavar="IF", help="Bind to interface IF")
 
920
    parser.add_option("-a", "--address", type="string",
 
921
                      help="Address to listen for requests on")
 
922
    parser.add_option("-p", "--port", type="int",
554
923
                      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")
561
 
    parser.add_option("--check", action="store_true", default=False,
 
924
    parser.add_option("--check", action="store_true",
562
925
                      help="Run self-test")
563
 
    parser.add_option("--debug", action="store_true", default=False,
564
 
                      help="Debug mode")
565
 
    (options, args) = parser.parse_args()
 
926
    parser.add_option("--debug", action="store_true",
 
927
                      help="Debug mode; run in foreground and log to"
 
928
                      " terminal")
 
929
    parser.add_option("--priority", type="string", help="GnuTLS"
 
930
                      " priority string (see GnuTLS documentation)")
 
931
    parser.add_option("--servicename", type="string", metavar="NAME",
 
932
                      help="Zeroconf service name")
 
933
    parser.add_option("--configdir", type="string",
 
934
                      default="/etc/mandos", metavar="DIR",
 
935
                      help="Directory to search for configuration"
 
936
                      " files")
 
937
    parser.add_option("--no-dbus", action="store_false",
 
938
                      dest="use_dbus",
 
939
                      help="Do not provide D-Bus system bus"
 
940
                      " interface")
 
941
    parser.add_option("--no-ipv6", action="store_false",
 
942
                      dest="use_ipv6", help="Do not use IPv6")
 
943
    options = parser.parse_args()[0]
566
944
    
567
945
    if options.check:
568
946
        import doctest
569
947
        doctest.testmod()
570
948
        sys.exit()
571
949
    
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
 
950
    # Default values for config file for server-global settings
 
951
    server_defaults = { "interface": "",
 
952
                        "address": "",
 
953
                        "port": "",
 
954
                        "debug": "False",
 
955
                        "priority":
 
956
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
957
                        "servicename": "Mandos",
 
958
                        "use_dbus": "True",
 
959
                        "use_ipv6": "True",
 
960
                        }
 
961
    
 
962
    # Parse config file for server-global settings
 
963
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
964
    del server_defaults
 
965
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
966
    # Convert the SafeConfigParser object to a dict
 
967
    server_settings = server_config.defaults()
 
968
    # Use the appropriate methods on the non-string config options
 
969
    server_settings["debug"] = server_config.getboolean("DEFAULT",
 
970
                                                        "debug")
 
971
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
 
972
                                                           "use_dbus")
 
973
    server_settings["use_ipv6"] = server_config.getboolean("DEFAULT",
 
974
                                                           "use_ipv6")
 
975
    if server_settings["port"]:
 
976
        server_settings["port"] = server_config.getint("DEFAULT",
 
977
                                                       "port")
 
978
    del server_config
 
979
    
 
980
    # Override the settings from the config file with command line
 
981
    # options, if set.
 
982
    for option in ("interface", "address", "port", "debug",
 
983
                   "priority", "servicename", "configdir",
 
984
                   "use_dbus", "use_ipv6"):
 
985
        value = getattr(options, option)
 
986
        if value is not None:
 
987
            server_settings[option] = value
 
988
    del options
 
989
    # Now we have our good server settings in "server_settings"
 
990
    
 
991
    # For convenience
 
992
    debug = server_settings["debug"]
 
993
    use_dbus = server_settings["use_dbus"]
 
994
    use_ipv6 = server_settings["use_ipv6"]
 
995
    
 
996
    if not debug:
 
997
        syslogger.setLevel(logging.WARNING)
 
998
        console.setLevel(logging.WARNING)
 
999
    
 
1000
    if server_settings["servicename"] != "Mandos":
 
1001
        syslogger.setFormatter(logging.Formatter
 
1002
                               ('Mandos (%s): %%(levelname)s:'
 
1003
                                ' %%(message)s'
 
1004
                                % server_settings["servicename"]))
 
1005
    
 
1006
    # Parse config file with clients
 
1007
    client_defaults = { "timeout": "1h",
 
1008
                        "interval": "5m",
 
1009
                        "checker": "fping -q -- %%(host)s",
 
1010
                        "host": "",
 
1011
                        }
 
1012
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
1013
    client_config.read(os.path.join(server_settings["configdir"],
 
1014
                                    "clients.conf"))
 
1015
    
 
1016
    clients = Set()
 
1017
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
1018
                                 server_settings["port"]),
 
1019
                                TCP_handler,
 
1020
                                settings=server_settings,
 
1021
                                clients=clients, use_ipv6=use_ipv6)
 
1022
    pidfilename = "/var/run/mandos.pid"
 
1023
    try:
 
1024
        pidfile = open(pidfilename, "w")
 
1025
    except IOError:
 
1026
        logger.error("Could not open file %r", pidfilename)
 
1027
    
 
1028
    try:
 
1029
        uid = pwd.getpwnam("_mandos").pw_uid
 
1030
        gid = pwd.getpwnam("_mandos").pw_gid
 
1031
    except KeyError:
 
1032
        try:
 
1033
            uid = pwd.getpwnam("mandos").pw_uid
 
1034
            gid = pwd.getpwnam("mandos").pw_gid
 
1035
        except KeyError:
 
1036
            try:
 
1037
                uid = pwd.getpwnam("nobody").pw_uid
 
1038
                gid = pwd.getpwnam("nogroup").pw_gid
 
1039
            except KeyError:
 
1040
                uid = 65534
 
1041
                gid = 65534
 
1042
    try:
 
1043
        os.setgid(gid)
 
1044
        os.setuid(uid)
 
1045
    except OSError, error:
 
1046
        if error[0] != errno.EPERM:
 
1047
            raise error
 
1048
    
 
1049
    # Enable all possible GnuTLS debugging
 
1050
    if debug:
 
1051
        # "Use a log level over 10 to enable all debugging options."
 
1052
        # - GnuTLS manual
 
1053
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1054
        
 
1055
        @gnutls.library.types.gnutls_log_func
 
1056
        def debug_gnutls(level, string):
 
1057
            logger.debug("GnuTLS: %s", string[:-1])
 
1058
        
 
1059
        (gnutls.library.functions
 
1060
         .gnutls_global_set_log_function(debug_gnutls))
 
1061
    
 
1062
    global service
 
1063
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1064
    service = AvahiService(name = server_settings["servicename"],
 
1065
                           servicetype = "_mandos._tcp",
 
1066
                           protocol = protocol)
 
1067
    if server_settings["interface"]:
 
1068
        service.interface = (if_nametoindex
 
1069
                             (server_settings["interface"]))
 
1070
    
 
1071
    global main_loop
 
1072
    global bus
 
1073
    global server
 
1074
    # From the Avahi example code
589
1075
    DBusGMainLoop(set_as_default=True )
590
1076
    main_loop = gobject.MainLoop()
591
1077
    bus = dbus.SystemBus()
592
 
    server = dbus.Interface(
593
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
594
 
            avahi.DBUS_INTERFACE_SERVER )
 
1078
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
1079
                                           avahi.DBUS_PATH_SERVER),
 
1080
                            avahi.DBUS_INTERFACE_SERVER)
595
1081
    # End of Avahi example code
596
 
    
597
 
    debug = options.debug
598
 
    
599
 
    clients = Set()
600
 
    def remove_from_clients(client):
601
 
        clients.remove(client)
602
 
        if not clients:
603
 
            logger.debug(u"No clients left, exiting")
604
 
            main_loop.quit()
605
 
    
606
 
    clients.update(Set(Client(name=section, options=options,
607
 
                              stop_hook = remove_from_clients,
608
 
                              **(dict(client_config\
609
 
                                      .items(section))))
 
1082
    if use_dbus:
 
1083
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1084
    
 
1085
    clients.update(Set(Client(name = section,
 
1086
                              config
 
1087
                              = dict(client_config.items(section)),
 
1088
                              use_dbus = use_dbus)
610
1089
                       for section in client_config.sections()))
 
1090
    if not clients:
 
1091
        logger.warning(u"No clients defined")
 
1092
    
 
1093
    if debug:
 
1094
        # Redirect stdin so all checkers get /dev/null
 
1095
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1096
        os.dup2(null, sys.stdin.fileno())
 
1097
        if null > 2:
 
1098
            os.close(null)
 
1099
    else:
 
1100
        # No console logging
 
1101
        logger.removeHandler(console)
 
1102
        # Close all input and output, do double fork, etc.
 
1103
        daemon()
 
1104
    
 
1105
    try:
 
1106
        pid = os.getpid()
 
1107
        pidfile.write(str(pid) + "\n")
 
1108
        pidfile.close()
 
1109
        del pidfile
 
1110
    except IOError:
 
1111
        logger.error(u"Could not write to file %r with PID %d",
 
1112
                     pidfilename, pid)
 
1113
    except NameError:
 
1114
        # "pidfile" was never created
 
1115
        pass
 
1116
    del pidfilename
 
1117
    
 
1118
    def cleanup():
 
1119
        "Cleanup function; run on exit"
 
1120
        global group
 
1121
        # From the Avahi example code
 
1122
        if not group is None:
 
1123
            group.Free()
 
1124
            group = None
 
1125
        # End of Avahi example code
 
1126
        
 
1127
        while clients:
 
1128
            client = clients.pop()
 
1129
            client.disable_hook = None
 
1130
            client.disable()
 
1131
    
 
1132
    atexit.register(cleanup)
 
1133
    
 
1134
    if not debug:
 
1135
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1136
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1137
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1138
    
 
1139
    if use_dbus:
 
1140
        class MandosServer(dbus.service.Object):
 
1141
            """A D-Bus proxy object"""
 
1142
            def __init__(self):
 
1143
                dbus.service.Object.__init__(self, bus, "/")
 
1144
            _interface = u"se.bsnet.fukt.Mandos"
 
1145
            
 
1146
            @dbus.service.signal(_interface, signature="oa{sv}")
 
1147
            def ClientAdded(self, objpath, properties):
 
1148
                "D-Bus signal"
 
1149
                pass
 
1150
            
 
1151
            @dbus.service.signal(_interface, signature="os")
 
1152
            def ClientRemoved(self, objpath, name):
 
1153
                "D-Bus signal"
 
1154
                pass
 
1155
            
 
1156
            @dbus.service.method(_interface, out_signature="ao")
 
1157
            def GetAllClients(self):
 
1158
                "D-Bus method"
 
1159
                return dbus.Array(c.dbus_object_path for c in clients)
 
1160
            
 
1161
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
 
1162
            def GetAllClientsWithProperties(self):
 
1163
                "D-Bus method"
 
1164
                return dbus.Dictionary(
 
1165
                    ((c.dbus_object_path, c.GetAllProperties())
 
1166
                     for c in clients),
 
1167
                    signature="oa{sv}")
 
1168
            
 
1169
            @dbus.service.method(_interface, in_signature="o")
 
1170
            def RemoveClient(self, object_path):
 
1171
                "D-Bus method"
 
1172
                for c in clients:
 
1173
                    if c.dbus_object_path == object_path:
 
1174
                        clients.remove(c)
 
1175
                        # Don't signal anything except ClientRemoved
 
1176
                        c.use_dbus = False
 
1177
                        c.disable()
 
1178
                        # Emit D-Bus signal
 
1179
                        self.ClientRemoved(object_path, c.name)
 
1180
                        return
 
1181
                raise KeyError
 
1182
            
 
1183
            del _interface
 
1184
        
 
1185
        mandos_server = MandosServer()
 
1186
    
611
1187
    for client in clients:
612
 
        client.start()
613
 
    
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)
 
1188
        if use_dbus:
 
1189
            # Emit D-Bus signal
 
1190
            mandos_server.ClientAdded(client.dbus_object_path,
 
1191
                                      client.GetAllProperties())
 
1192
        client.enable()
 
1193
    
 
1194
    tcp_server.enable()
 
1195
    tcp_server.server_activate()
 
1196
    
 
1197
    # Find out what port we got
 
1198
    service.port = tcp_server.socket.getsockname()[1]
 
1199
    if use_ipv6:
 
1200
        logger.info(u"Now listening on address %r, port %d,"
 
1201
                    " flowinfo %d, scope_id %d"
 
1202
                    % tcp_server.socket.getsockname())
 
1203
    else:                       # IPv4
 
1204
        logger.info(u"Now listening on address %r, port %d"
 
1205
                    % tcp_server.socket.getsockname())
 
1206
    
 
1207
    #service.interface = tcp_server.socket.getsockname()[3]
 
1208
    
634
1209
    try:
 
1210
        # From the Avahi example code
 
1211
        server.connect_to_signal("StateChanged", server_state_changed)
 
1212
        try:
 
1213
            server_state_changed(server.GetState())
 
1214
        except dbus.exceptions.DBusException, error:
 
1215
            logger.critical(u"DBusException: %s", error)
 
1216
            sys.exit(1)
 
1217
        # End of Avahi example code
 
1218
        
 
1219
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
1220
                             lambda *args, **kwargs:
 
1221
                             (tcp_server.handle_request
 
1222
                              (*args[2:], **kwargs) or True))
 
1223
        
 
1224
        logger.debug(u"Starting main loop")
635
1225
        main_loop.run()
 
1226
    except AvahiError, error:
 
1227
        logger.critical(u"AvahiError: %s", error)
 
1228
        sys.exit(1)
636
1229
    except KeyboardInterrupt:
637
 
        print
638
 
    
639
 
    # Cleanup here
 
1230
        if debug:
 
1231
            print >> sys.stderr
 
1232
        logger.debug("Server received KeyboardInterrupt")
 
1233
    logger.debug("Server exiting")
640
1234
 
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()
 
1235
if __name__ == '__main__':
 
1236
    main()