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  • Committer: Teddy Hogeborn
  • Date: 2009-10-18 08:47:40 UTC
  • Revision ID: teddy@fukt.bsnet.se-20091018084740-fa1qgm22lg125r10
* plugins.d/splashy.c: Use exit codes from <sysexits.h>.

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mandos
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# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
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".
 
9
# methods "add", "remove", "server_state_changed",
 
10
# "entry_group_state_changed", "cleanup", and "activate" in the
 
11
# "AvahiService" class, and some lines in "main".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
14
# Copyright © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
15
16
# 
16
17
# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
24
25
#     GNU General Public License for more details.
25
26
# 
26
27
# 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
# along with this program.  If not, see
 
29
# <http://www.gnu.org/licenses/>.
28
30
# 
29
31
# Contact the authors at <mandos@fukt.bsnet.se>.
30
32
# 
31
33
 
32
 
from __future__ import division
 
34
from __future__ import division, with_statement, absolute_import
33
35
 
34
 
import SocketServer
 
36
import SocketServer as socketserver
35
37
import socket
36
 
import select
37
 
from optparse import OptionParser
 
38
import optparse
38
39
import datetime
39
40
import errno
40
41
import gnutls.crypto
43
44
import gnutls.library.functions
44
45
import gnutls.library.constants
45
46
import gnutls.library.types
46
 
import ConfigParser
 
47
import ConfigParser as configparser
47
48
import sys
48
49
import re
49
50
import os
50
51
import signal
51
 
from sets import Set
52
52
import subprocess
53
53
import atexit
54
54
import stat
55
55
import logging
56
56
import logging.handlers
 
57
import pwd
 
58
from contextlib import closing
 
59
import struct
 
60
import fcntl
 
61
import functools
57
62
 
58
63
import dbus
 
64
import dbus.service
59
65
import gobject
60
66
import avahi
61
67
from dbus.mainloop.glib import DBusGMainLoop
62
68
import ctypes
63
 
 
64
 
version = "1.0"
65
 
 
66
 
logger = logging.Logger('mandos')
67
 
syslogger = logging.handlers.SysLogHandler\
68
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
 
             address = "/dev/log")
70
 
syslogger.setFormatter(logging.Formatter\
71
 
                        ('Mandos: %(levelname)s: %(message)s'))
 
69
import ctypes.util
 
70
import xml.dom.minidom
 
71
import inspect
 
72
 
 
73
try:
 
74
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
75
except AttributeError:
 
76
    try:
 
77
        from IN import SO_BINDTODEVICE
 
78
    except ImportError:
 
79
        SO_BINDTODEVICE = None
 
80
 
 
81
 
 
82
version = "1.0.12"
 
83
 
 
84
logger = logging.Logger(u'mandos')
 
85
syslogger = (logging.handlers.SysLogHandler
 
86
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
87
              address = "/dev/log"))
 
88
syslogger.setFormatter(logging.Formatter
 
89
                       (u'Mandos [%(process)d]: %(levelname)s:'
 
90
                        u' %(message)s'))
72
91
logger.addHandler(syslogger)
73
92
 
74
93
console = logging.StreamHandler()
75
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
 
                                       ' %(message)s'))
 
94
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
 
95
                                       u' %(levelname)s:'
 
96
                                       u' %(message)s'))
77
97
logger.addHandler(console)
78
98
 
79
99
class AvahiError(Exception):
80
 
    def __init__(self, value):
 
100
    def __init__(self, value, *args, **kwargs):
81
101
        self.value = value
82
 
    def __str__(self):
83
 
        return repr(self.value)
 
102
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
103
    def __unicode__(self):
 
104
        return unicode(repr(self.value))
84
105
 
85
106
class AvahiServiceError(AvahiError):
86
107
    pass
91
112
 
92
113
class AvahiService(object):
93
114
    """An Avahi (Zeroconf) service.
 
115
    
94
116
    Attributes:
95
117
    interface: integer; avahi.IF_UNSPEC or an interface index.
96
118
               Used to optionally bind to the specified interface.
97
 
    name: string; Example: 'Mandos'
98
 
    type: string; Example: '_mandos._tcp'.
 
119
    name: string; Example: u'Mandos'
 
120
    type: string; Example: u'_mandos._tcp'.
99
121
                  See <http://www.dns-sd.org/ServiceTypes.html>
100
122
    port: integer; what port to announce
101
123
    TXT: list of strings; TXT record for the service
104
126
    max_renames: integer; maximum number of renames
105
127
    rename_count: integer; counter so we only rename after collisions
106
128
                  a sensible number of times
 
129
    group: D-Bus Entry Group
 
130
    server: D-Bus Server
 
131
    bus: dbus.SystemBus()
107
132
    """
108
133
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
 
                 type = None, port = None, TXT = None, domain = "",
110
 
                 host = "", max_renames = 32768):
 
134
                 servicetype = None, port = None, TXT = None,
 
135
                 domain = u"", host = u"", max_renames = 32768,
 
136
                 protocol = avahi.PROTO_UNSPEC, bus = None):
111
137
        self.interface = interface
112
138
        self.name = name
113
 
        self.type = type
 
139
        self.type = servicetype
114
140
        self.port = port
115
 
        if TXT is None:
116
 
            self.TXT = []
117
 
        else:
118
 
            self.TXT = TXT
 
141
        self.TXT = TXT if TXT is not None else []
119
142
        self.domain = domain
120
143
        self.host = host
121
144
        self.rename_count = 0
122
145
        self.max_renames = max_renames
 
146
        self.protocol = protocol
 
147
        self.group = None       # our entry group
 
148
        self.server = None
 
149
        self.bus = bus
123
150
    def rename(self):
124
151
        """Derived from the Avahi example code"""
125
152
        if self.rename_count >= self.max_renames:
126
 
            logger.critical(u"No suitable service name found after %i"
127
 
                            u" retries, exiting.", rename_count)
128
 
            raise AvahiServiceError("Too many renames")
129
 
        self.name = server.GetAlternativeServiceName(self.name)
130
 
        logger.info(u"Changing name to %r ...", str(self.name))
131
 
        syslogger.setFormatter(logging.Formatter\
132
 
                               ('Mandos (%s): %%(levelname)s:'
133
 
                               ' %%(message)s' % self.name))
 
153
            logger.critical(u"No suitable Zeroconf service name found"
 
154
                            u" after %i retries, exiting.",
 
155
                            self.rename_count)
 
156
            raise AvahiServiceError(u"Too many renames")
 
157
        self.name = self.server.GetAlternativeServiceName(self.name)
 
158
        logger.info(u"Changing Zeroconf service name to %r ...",
 
159
                    unicode(self.name))
 
160
        syslogger.setFormatter(logging.Formatter
 
161
                               (u'Mandos (%s) [%%(process)d]:'
 
162
                                u' %%(levelname)s: %%(message)s'
 
163
                                % self.name))
134
164
        self.remove()
135
165
        self.add()
136
166
        self.rename_count += 1
137
167
    def remove(self):
138
168
        """Derived from the Avahi example code"""
139
 
        if group is not None:
140
 
            group.Reset()
 
169
        if self.group is not None:
 
170
            self.group.Reset()
141
171
    def add(self):
142
172
        """Derived from the Avahi example code"""
143
 
        global group
144
 
        if group is None:
145
 
            group = dbus.Interface\
146
 
                    (bus.get_object(avahi.DBUS_NAME,
147
 
                                    server.EntryGroupNew()),
148
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
149
 
            group.connect_to_signal('StateChanged',
150
 
                                    entry_group_state_changed)
151
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
152
 
                     service.name, service.type)
153
 
        group.AddService(
154
 
                self.interface,         # interface
155
 
                avahi.PROTO_INET6,      # protocol
156
 
                dbus.UInt32(0),         # flags
157
 
                self.name, self.type,
158
 
                self.domain, self.host,
159
 
                dbus.UInt16(self.port),
160
 
                avahi.string_array_to_txt_array(self.TXT))
161
 
        group.Commit()
162
 
 
163
 
# From the Avahi example code:
164
 
group = None                            # our entry group
165
 
# End of Avahi example code
 
173
        if self.group is None:
 
174
            self.group = dbus.Interface(
 
175
                self.bus.get_object(avahi.DBUS_NAME,
 
176
                                    self.server.EntryGroupNew()),
 
177
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
178
            self.group.connect_to_signal('StateChanged',
 
179
                                         self
 
180
                                         .entry_group_state_changed)
 
181
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
182
                     self.name, self.type)
 
183
        self.group.AddService(
 
184
            self.interface,
 
185
            self.protocol,
 
186
            dbus.UInt32(0),     # flags
 
187
            self.name, self.type,
 
188
            self.domain, self.host,
 
189
            dbus.UInt16(self.port),
 
190
            avahi.string_array_to_txt_array(self.TXT))
 
191
        self.group.Commit()
 
192
    def entry_group_state_changed(self, state, error):
 
193
        """Derived from the Avahi example code"""
 
194
        logger.debug(u"Avahi state change: %i", state)
 
195
        
 
196
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
197
            logger.debug(u"Zeroconf service established.")
 
198
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
199
            logger.warning(u"Zeroconf service name collision.")
 
200
            self.rename()
 
201
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
202
            logger.critical(u"Avahi: Error in group state changed %s",
 
203
                            unicode(error))
 
204
            raise AvahiGroupError(u"State changed: %s"
 
205
                                  % unicode(error))
 
206
    def cleanup(self):
 
207
        """Derived from the Avahi example code"""
 
208
        if self.group is not None:
 
209
            self.group.Free()
 
210
            self.group = None
 
211
    def server_state_changed(self, state):
 
212
        """Derived from the Avahi example code"""
 
213
        if state == avahi.SERVER_COLLISION:
 
214
            logger.error(u"Zeroconf server name collision")
 
215
            self.remove()
 
216
        elif state == avahi.SERVER_RUNNING:
 
217
            self.add()
 
218
    def activate(self):
 
219
        """Derived from the Avahi example code"""
 
220
        if self.server is None:
 
221
            self.server = dbus.Interface(
 
222
                self.bus.get_object(avahi.DBUS_NAME,
 
223
                                    avahi.DBUS_PATH_SERVER),
 
224
                avahi.DBUS_INTERFACE_SERVER)
 
225
        self.server.connect_to_signal(u"StateChanged",
 
226
                                 self.server_state_changed)
 
227
        self.server_state_changed(self.server.GetState())
166
228
 
167
229
 
168
230
class Client(object):
169
231
    """A representation of a client host served by this server.
 
232
    
170
233
    Attributes:
171
 
    name:      string; from the config file, used in log messages
 
234
    name:       string; from the config file, used in log messages and
 
235
                        D-Bus identifiers
172
236
    fingerprint: string (40 or 32 hexadecimal digits); used to
173
237
                 uniquely identify the client
174
 
    secret:    bytestring; sent verbatim (over TLS) to client
175
 
    host:      string; available for use by the checker command
176
 
    created:   datetime.datetime(); object creation, not client host
177
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
178
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
179
 
                                     until this client is invalid
180
 
    interval:  datetime.timedelta(); How often to start a new checker
181
 
    stop_hook: If set, called by stop() as stop_hook(self)
182
 
    checker:   subprocess.Popen(); a running checker process used
183
 
                                   to see if the client lives.
184
 
                                   'None' if no process is running.
 
238
    secret:     bytestring; sent verbatim (over TLS) to client
 
239
    host:       string; available for use by the checker command
 
240
    created:    datetime.datetime(); (UTC) object creation
 
241
    last_enabled: datetime.datetime(); (UTC)
 
242
    enabled:    bool()
 
243
    last_checked_ok: datetime.datetime(); (UTC) or None
 
244
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
245
                                      until this client is invalid
 
246
    interval:   datetime.timedelta(); How often to start a new checker
 
247
    disable_hook:  If set, called by disable() as disable_hook(self)
 
248
    checker:    subprocess.Popen(); a running checker process used
 
249
                                    to see if the client lives.
 
250
                                    'None' if no process is running.
185
251
    checker_initiator_tag: a gobject event source tag, or None
186
 
    stop_initiator_tag:    - '' -
 
252
    disable_initiator_tag: - '' -
187
253
    checker_callback_tag:  - '' -
188
254
    checker_command: string; External command which is run to check if
189
255
                     client lives.  %() expansions are done at
190
256
                     runtime with vars(self) as dict, so that for
191
257
                     instance %(name)s can be used in the command.
192
 
    Private attibutes:
193
 
    _timeout: Real variable for 'timeout'
194
 
    _interval: Real variable for 'interval'
195
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
196
 
    _interval_milliseconds: - '' -
 
258
    current_checker_command: string; current running checker_command
197
259
    """
198
 
    def _set_timeout(self, timeout):
199
 
        "Setter function for 'timeout' attribute"
200
 
        self._timeout = timeout
201
 
        self._timeout_milliseconds = ((self.timeout.days
202
 
                                       * 24 * 60 * 60 * 1000)
203
 
                                      + (self.timeout.seconds * 1000)
204
 
                                      + (self.timeout.microseconds
205
 
                                         // 1000))
206
 
    timeout = property(lambda self: self._timeout,
207
 
                       _set_timeout)
208
 
    del _set_timeout
209
 
    def _set_interval(self, interval):
210
 
        "Setter function for 'interval' attribute"
211
 
        self._interval = interval
212
 
        self._interval_milliseconds = ((self.interval.days
213
 
                                        * 24 * 60 * 60 * 1000)
214
 
                                       + (self.interval.seconds
215
 
                                          * 1000)
216
 
                                       + (self.interval.microseconds
217
 
                                          // 1000))
218
 
    interval = property(lambda self: self._interval,
219
 
                        _set_interval)
220
 
    del _set_interval
221
 
    def __init__(self, name = None, stop_hook=None, config={}):
 
260
    
 
261
    @staticmethod
 
262
    def _timedelta_to_milliseconds(td):
 
263
        "Convert a datetime.timedelta() to milliseconds"
 
264
        return ((td.days * 24 * 60 * 60 * 1000)
 
265
                + (td.seconds * 1000)
 
266
                + (td.microseconds // 1000))
 
267
    
 
268
    def timeout_milliseconds(self):
 
269
        "Return the 'timeout' attribute in milliseconds"
 
270
        return self._timedelta_to_milliseconds(self.timeout)
 
271
    
 
272
    def interval_milliseconds(self):
 
273
        "Return the 'interval' attribute in milliseconds"
 
274
        return self._timedelta_to_milliseconds(self.interval)
 
275
    
 
276
    def __init__(self, name = None, disable_hook=None, config=None):
222
277
        """Note: the 'checker' key in 'config' sets the
223
278
        'checker_command' attribute and *not* the 'checker'
224
279
        attribute."""
225
280
        self.name = name
 
281
        if config is None:
 
282
            config = {}
226
283
        logger.debug(u"Creating client %r", self.name)
227
284
        # Uppercase and remove spaces from fingerprint for later
228
285
        # comparison purposes with return value from the fingerprint()
229
286
        # function
230
 
        self.fingerprint = config["fingerprint"].upper()\
231
 
                           .replace(u" ", u"")
 
287
        self.fingerprint = (config[u"fingerprint"].upper()
 
288
                            .replace(u" ", u""))
232
289
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
233
 
        if "secret" in config:
234
 
            self.secret = config["secret"].decode(u"base64")
235
 
        elif "secfile" in config:
236
 
            sf = open(config["secfile"])
237
 
            self.secret = sf.read()
238
 
            sf.close()
 
290
        if u"secret" in config:
 
291
            self.secret = config[u"secret"].decode(u"base64")
 
292
        elif u"secfile" in config:
 
293
            with closing(open(os.path.expanduser
 
294
                              (os.path.expandvars
 
295
                               (config[u"secfile"])),
 
296
                              "rb")) as secfile:
 
297
                self.secret = secfile.read()
239
298
        else:
240
299
            raise TypeError(u"No secret or secfile for client %s"
241
300
                            % self.name)
242
 
        self.host = config.get("host", "")
243
 
        self.created = datetime.datetime.now()
 
301
        self.host = config.get(u"host", u"")
 
302
        self.created = datetime.datetime.utcnow()
 
303
        self.enabled = False
 
304
        self.last_enabled = None
244
305
        self.last_checked_ok = None
245
 
        self.timeout = string_to_delta(config["timeout"])
246
 
        self.interval = string_to_delta(config["interval"])
247
 
        self.stop_hook = stop_hook
 
306
        self.timeout = string_to_delta(config[u"timeout"])
 
307
        self.interval = string_to_delta(config[u"interval"])
 
308
        self.disable_hook = disable_hook
248
309
        self.checker = None
249
310
        self.checker_initiator_tag = None
250
 
        self.stop_initiator_tag = None
 
311
        self.disable_initiator_tag = None
251
312
        self.checker_callback_tag = None
252
 
        self.check_command = config["checker"]
253
 
    def start(self):
 
313
        self.checker_command = config[u"checker"]
 
314
        self.current_checker_command = None
 
315
        self.last_connect = None
 
316
    
 
317
    def enable(self):
254
318
        """Start this client's checker and timeout hooks"""
 
319
        if getattr(self, u"enabled", False):
 
320
            # Already enabled
 
321
            return
 
322
        self.last_enabled = datetime.datetime.utcnow()
255
323
        # Schedule a new checker to be started an 'interval' from now,
256
324
        # and every interval from then on.
257
 
        self.checker_initiator_tag = gobject.timeout_add\
258
 
                                     (self._interval_milliseconds,
259
 
                                      self.start_checker)
 
325
        self.checker_initiator_tag = (gobject.timeout_add
 
326
                                      (self.interval_milliseconds(),
 
327
                                       self.start_checker))
260
328
        # Also start a new checker *right now*.
261
329
        self.start_checker()
262
 
        # Schedule a stop() when 'timeout' has passed
263
 
        self.stop_initiator_tag = gobject.timeout_add\
264
 
                                  (self._timeout_milliseconds,
265
 
                                   self.stop)
266
 
    def stop(self):
267
 
        """Stop this client.
268
 
        The possibility that a client might be restarted is left open,
269
 
        but not currently used."""
270
 
        # If this client doesn't have a secret, it is already stopped.
271
 
        if hasattr(self, "secret") and self.secret:
272
 
            logger.info(u"Stopping client %s", self.name)
273
 
            self.secret = None
274
 
        else:
 
330
        # Schedule a disable() when 'timeout' has passed
 
331
        self.disable_initiator_tag = (gobject.timeout_add
 
332
                                   (self.timeout_milliseconds(),
 
333
                                    self.disable))
 
334
        self.enabled = True
 
335
    
 
336
    def disable(self):
 
337
        """Disable this client."""
 
338
        if not getattr(self, "enabled", False):
275
339
            return False
276
 
        if getattr(self, "stop_initiator_tag", False):
277
 
            gobject.source_remove(self.stop_initiator_tag)
278
 
            self.stop_initiator_tag = None
279
 
        if getattr(self, "checker_initiator_tag", False):
 
340
        logger.info(u"Disabling client %s", self.name)
 
341
        if getattr(self, u"disable_initiator_tag", False):
 
342
            gobject.source_remove(self.disable_initiator_tag)
 
343
            self.disable_initiator_tag = None
 
344
        if getattr(self, u"checker_initiator_tag", False):
280
345
            gobject.source_remove(self.checker_initiator_tag)
281
346
            self.checker_initiator_tag = None
282
347
        self.stop_checker()
283
 
        if self.stop_hook:
284
 
            self.stop_hook(self)
 
348
        if self.disable_hook:
 
349
            self.disable_hook(self)
 
350
        self.enabled = False
285
351
        # Do not run this again if called by a gobject.timeout_add
286
352
        return False
 
353
    
287
354
    def __del__(self):
288
 
        self.stop_hook = None
289
 
        self.stop()
290
 
    def checker_callback(self, pid, condition):
 
355
        self.disable_hook = None
 
356
        self.disable()
 
357
    
 
358
    def checker_callback(self, pid, condition, command):
291
359
        """The checker has completed, so take appropriate actions."""
292
 
        now = datetime.datetime.now()
293
360
        self.checker_callback_tag = None
294
361
        self.checker = None
295
 
        if os.WIFEXITED(condition) \
296
 
               and (os.WEXITSTATUS(condition) == 0):
297
 
            logger.info(u"Checker for %(name)s succeeded",
298
 
                        vars(self))
299
 
            self.last_checked_ok = now
300
 
            gobject.source_remove(self.stop_initiator_tag)
301
 
            self.stop_initiator_tag = gobject.timeout_add\
302
 
                                      (self._timeout_milliseconds,
303
 
                                       self.stop)
304
 
        elif not os.WIFEXITED(condition):
 
362
        if os.WIFEXITED(condition):
 
363
            exitstatus = os.WEXITSTATUS(condition)
 
364
            if exitstatus == 0:
 
365
                logger.info(u"Checker for %(name)s succeeded",
 
366
                            vars(self))
 
367
                self.checked_ok()
 
368
            else:
 
369
                logger.info(u"Checker for %(name)s failed",
 
370
                            vars(self))
 
371
        else:
305
372
            logger.warning(u"Checker for %(name)s crashed?",
306
373
                           vars(self))
307
 
        else:
308
 
            logger.info(u"Checker for %(name)s failed",
309
 
                        vars(self))
 
374
    
 
375
    def checked_ok(self):
 
376
        """Bump up the timeout for this client.
 
377
        
 
378
        This should only be called when the client has been seen,
 
379
        alive and well.
 
380
        """
 
381
        self.last_checked_ok = datetime.datetime.utcnow()
 
382
        gobject.source_remove(self.disable_initiator_tag)
 
383
        self.disable_initiator_tag = (gobject.timeout_add
 
384
                                      (self.timeout_milliseconds(),
 
385
                                       self.disable))
 
386
    
310
387
    def start_checker(self):
311
388
        """Start a new checker subprocess if one is not running.
 
389
        
312
390
        If a checker already exists, leave it running and do
313
391
        nothing."""
314
392
        # The reason for not killing a running checker is that if we
319
397
        # checkers alone, the checker would have to take more time
320
398
        # than 'timeout' for the client to be declared invalid, which
321
399
        # is as it should be.
 
400
        
 
401
        # If a checker exists, make sure it is not a zombie
 
402
        try:
 
403
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
404
        except (AttributeError, OSError), error:
 
405
            if (isinstance(error, OSError)
 
406
                and error.errno != errno.ECHILD):
 
407
                raise error
 
408
        else:
 
409
            if pid:
 
410
                logger.warning(u"Checker was a zombie")
 
411
                gobject.source_remove(self.checker_callback_tag)
 
412
                self.checker_callback(pid, status,
 
413
                                      self.current_checker_command)
 
414
        # Start a new checker if needed
322
415
        if self.checker is None:
323
416
            try:
324
 
                # In case check_command has exactly one % operator
325
 
                command = self.check_command % self.host
 
417
                # In case checker_command has exactly one % operator
 
418
                command = self.checker_command % self.host
326
419
            except TypeError:
327
420
                # Escape attributes for the shell
328
 
                escaped_attrs = dict((key, re.escape(str(val)))
 
421
                escaped_attrs = dict((key,
 
422
                                      re.escape(unicode(str(val),
 
423
                                                        errors=
 
424
                                                        u'replace')))
329
425
                                     for key, val in
330
426
                                     vars(self).iteritems())
331
427
                try:
332
 
                    command = self.check_command % escaped_attrs
 
428
                    command = self.checker_command % escaped_attrs
333
429
                except TypeError, error:
334
430
                    logger.error(u'Could not format string "%s":'
335
 
                                 u' %s', self.check_command, error)
 
431
                                 u' %s', self.checker_command, error)
336
432
                    return True # Try again later
 
433
            self.current_checker_command = command
337
434
            try:
338
435
                logger.info(u"Starting checker %r for %s",
339
436
                            command, self.name)
 
437
                # We don't need to redirect stdout and stderr, since
 
438
                # in normal mode, that is already done by daemon(),
 
439
                # and in debug mode we don't want to.  (Stdin is
 
440
                # always replaced by /dev/null.)
340
441
                self.checker = subprocess.Popen(command,
341
442
                                                close_fds=True,
342
 
                                                shell=True, cwd="/")
343
 
                self.checker_callback_tag = gobject.child_watch_add\
344
 
                                            (self.checker.pid,
345
 
                                             self.checker_callback)
346
 
            except subprocess.OSError, error:
 
443
                                                shell=True, cwd=u"/")
 
444
                self.checker_callback_tag = (gobject.child_watch_add
 
445
                                             (self.checker.pid,
 
446
                                              self.checker_callback,
 
447
                                              data=command))
 
448
                # The checker may have completed before the gobject
 
449
                # watch was added.  Check for this.
 
450
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
451
                if pid:
 
452
                    gobject.source_remove(self.checker_callback_tag)
 
453
                    self.checker_callback(pid, status, command)
 
454
            except OSError, error:
347
455
                logger.error(u"Failed to start subprocess: %s",
348
456
                             error)
349
457
        # Re-run this periodically if run by gobject.timeout_add
350
458
        return True
 
459
    
351
460
    def stop_checker(self):
352
461
        """Force the checker process, if any, to stop."""
353
462
        if self.checker_callback_tag:
354
463
            gobject.source_remove(self.checker_callback_tag)
355
464
            self.checker_callback_tag = None
356
 
        if getattr(self, "checker", None) is None:
 
465
        if getattr(self, u"checker", None) is None:
357
466
            return
358
467
        logger.debug(u"Stopping checker for %(name)s", vars(self))
359
468
        try:
365
474
            if error.errno != errno.ESRCH: # No such process
366
475
                raise
367
476
        self.checker = None
 
477
    
368
478
    def still_valid(self):
369
479
        """Has the timeout not yet passed for this client?"""
370
 
        now = datetime.datetime.now()
 
480
        if not getattr(self, u"enabled", False):
 
481
            return False
 
482
        now = datetime.datetime.utcnow()
371
483
        if self.last_checked_ok is None:
372
484
            return now < (self.created + self.timeout)
373
485
        else:
374
486
            return now < (self.last_checked_ok + self.timeout)
375
487
 
376
488
 
377
 
def peer_certificate(session):
378
 
    "Return the peer's OpenPGP certificate as a bytestring"
379
 
    # If not an OpenPGP certificate...
380
 
    if gnutls.library.functions.gnutls_certificate_type_get\
381
 
            (session._c_object) \
382
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
383
 
        # ...do the normal thing
384
 
        return session.peer_certificate
385
 
    list_size = ctypes.c_uint()
386
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
387
 
        (session._c_object, ctypes.byref(list_size))
388
 
    if list_size.value == 0:
389
 
        return None
390
 
    cert = cert_list[0]
391
 
    return ctypes.string_at(cert.data, cert.size)
392
 
 
393
 
 
394
 
def fingerprint(openpgp):
395
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
396
 
    # New GnuTLS "datum" with the OpenPGP public key
397
 
    datum = gnutls.library.types.gnutls_datum_t\
398
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
399
 
                     ctypes.POINTER(ctypes.c_ubyte)),
400
 
         ctypes.c_uint(len(openpgp)))
401
 
    # New empty GnuTLS certificate
402
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
403
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
404
 
        (ctypes.byref(crt))
405
 
    # Import the OpenPGP public key into the certificate
406
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
407
 
                    (crt, ctypes.byref(datum),
408
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
409
 
    # New buffer for the fingerprint
410
 
    buffer = ctypes.create_string_buffer(20)
411
 
    buffer_length = ctypes.c_size_t()
412
 
    # Get the fingerprint from the certificate into the buffer
413
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
414
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
415
 
    # Deinit the certificate
416
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
417
 
    # Convert the buffer to a Python bytestring
418
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
419
 
    # Convert the bytestring to hexadecimal notation
420
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
421
 
    return hex_fpr
422
 
 
423
 
 
424
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
425
 
    """A TCP request handler class.
426
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
489
def dbus_service_property(dbus_interface, signature=u"v",
 
490
                          access=u"readwrite", byte_arrays=False):
 
491
    """Decorators for marking methods of a DBusObjectWithProperties to
 
492
    become properties on the D-Bus.
 
493
    
 
494
    The decorated method will be called with no arguments by "Get"
 
495
    and with one argument by "Set".
 
496
    
 
497
    The parameters, where they are supported, are the same as
 
498
    dbus.service.method, except there is only "signature", since the
 
499
    type from Get() and the type sent to Set() is the same.
 
500
    """
 
501
    def decorator(func):
 
502
        func._dbus_is_property = True
 
503
        func._dbus_interface = dbus_interface
 
504
        func._dbus_signature = signature
 
505
        func._dbus_access = access
 
506
        func._dbus_name = func.__name__
 
507
        if func._dbus_name.endswith(u"_dbus_property"):
 
508
            func._dbus_name = func._dbus_name[:-14]
 
509
        func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
 
510
        return func
 
511
    return decorator
 
512
 
 
513
 
 
514
class DBusPropertyException(dbus.exceptions.DBusException):
 
515
    """A base class for D-Bus property-related exceptions
 
516
    """
 
517
    def __unicode__(self):
 
518
        return unicode(str(self))
 
519
 
 
520
 
 
521
class DBusPropertyAccessException(DBusPropertyException):
 
522
    """A property's access permissions disallows an operation.
 
523
    """
 
524
    pass
 
525
 
 
526
 
 
527
class DBusPropertyNotFound(DBusPropertyException):
 
528
    """An attempt was made to access a non-existing property.
 
529
    """
 
530
    pass
 
531
 
 
532
 
 
533
class DBusObjectWithProperties(dbus.service.Object):
 
534
    """A D-Bus object with properties.
 
535
 
 
536
    Classes inheriting from this can use the dbus_service_property
 
537
    decorator to expose methods as D-Bus properties.  It exposes the
 
538
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
539
    """
 
540
    
 
541
    @staticmethod
 
542
    def _is_dbus_property(obj):
 
543
        return getattr(obj, u"_dbus_is_property", False)
 
544
    
 
545
    def _get_all_dbus_properties(self):
 
546
        """Returns a generator of (name, attribute) pairs
 
547
        """
 
548
        return ((prop._dbus_name, prop)
 
549
                for name, prop in
 
550
                inspect.getmembers(self, self._is_dbus_property))
 
551
    
 
552
    def _get_dbus_property(self, interface_name, property_name):
 
553
        """Returns a bound method if one exists which is a D-Bus
 
554
        property with the specified name and interface.
 
555
        """
 
556
        for name in (property_name,
 
557
                     property_name + u"_dbus_property"):
 
558
            prop = getattr(self, name, None)
 
559
            if (prop is None
 
560
                or not self._is_dbus_property(prop)
 
561
                or prop._dbus_name != property_name
 
562
                or (interface_name and prop._dbus_interface
 
563
                    and interface_name != prop._dbus_interface)):
 
564
                continue
 
565
            return prop
 
566
        # No such property
 
567
        raise DBusPropertyNotFound(self.dbus_object_path + u":"
 
568
                                   + interface_name + u"."
 
569
                                   + property_name)
 
570
    
 
571
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
 
572
                         out_signature=u"v")
 
573
    def Get(self, interface_name, property_name):
 
574
        """Standard D-Bus property Get() method, see D-Bus standard.
 
575
        """
 
576
        prop = self._get_dbus_property(interface_name, property_name)
 
577
        if prop._dbus_access == u"write":
 
578
            raise DBusPropertyAccessException(property_name)
 
579
        value = prop()
 
580
        if not hasattr(value, u"variant_level"):
 
581
            return value
 
582
        return type(value)(value, variant_level=value.variant_level+1)
 
583
    
 
584
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
 
585
    def Set(self, interface_name, property_name, value):
 
586
        """Standard D-Bus property Set() method, see D-Bus standard.
 
587
        """
 
588
        prop = self._get_dbus_property(interface_name, property_name)
 
589
        if prop._dbus_access == u"read":
 
590
            raise DBusPropertyAccessException(property_name)
 
591
        if prop._dbus_get_args_options[u"byte_arrays"]:
 
592
            value = dbus.ByteArray(''.join(unichr(byte)
 
593
                                           for byte in value))
 
594
        prop(value)
 
595
    
 
596
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
 
597
                         out_signature=u"a{sv}")
 
598
    def GetAll(self, interface_name):
 
599
        """Standard D-Bus property GetAll() method, see D-Bus
 
600
        standard.
 
601
 
 
602
        Note: Will not include properties with access="write".
 
603
        """
 
604
        all = {}
 
605
        for name, prop in self._get_all_dbus_properties():
 
606
            if (interface_name
 
607
                and interface_name != prop._dbus_interface):
 
608
                # Interface non-empty but did not match
 
609
                continue
 
610
            # Ignore write-only properties
 
611
            if prop._dbus_access == u"write":
 
612
                continue
 
613
            value = prop()
 
614
            if not hasattr(value, u"variant_level"):
 
615
                all[name] = value
 
616
                continue
 
617
            all[name] = type(value)(value, variant_level=
 
618
                                    value.variant_level+1)
 
619
        return dbus.Dictionary(all, signature=u"sv")
 
620
    
 
621
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
622
                         out_signature=u"s",
 
623
                         path_keyword='object_path',
 
624
                         connection_keyword='connection')
 
625
    def Introspect(self, object_path, connection):
 
626
        """Standard D-Bus method, overloaded to insert property tags.
 
627
        """
 
628
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
629
                                                   connection)
 
630
        try:
 
631
            document = xml.dom.minidom.parseString(xmlstring)
 
632
            def make_tag(document, name, prop):
 
633
                e = document.createElement(u"property")
 
634
                e.setAttribute(u"name", name)
 
635
                e.setAttribute(u"type", prop._dbus_signature)
 
636
                e.setAttribute(u"access", prop._dbus_access)
 
637
                return e
 
638
            for if_tag in document.getElementsByTagName(u"interface"):
 
639
                for tag in (make_tag(document, name, prop)
 
640
                            for name, prop
 
641
                            in self._get_all_dbus_properties()
 
642
                            if prop._dbus_interface
 
643
                            == if_tag.getAttribute(u"name")):
 
644
                    if_tag.appendChild(tag)
 
645
                # Add the names to the return values for the
 
646
                # "org.freedesktop.DBus.Properties" methods
 
647
                if (if_tag.getAttribute(u"name")
 
648
                    == u"org.freedesktop.DBus.Properties"):
 
649
                    for cn in if_tag.getElementsByTagName(u"method"):
 
650
                        if cn.getAttribute(u"name") == u"Get":
 
651
                            for arg in cn.getElementsByTagName(u"arg"):
 
652
                                if (arg.getAttribute(u"direction")
 
653
                                    == u"out"):
 
654
                                    arg.setAttribute(u"name", u"value")
 
655
                        elif cn.getAttribute(u"name") == u"GetAll":
 
656
                            for arg in cn.getElementsByTagName(u"arg"):
 
657
                                if (arg.getAttribute(u"direction")
 
658
                                    == u"out"):
 
659
                                    arg.setAttribute(u"name", u"props")
 
660
            xmlstring = document.toxml(u"utf-8")
 
661
            document.unlink()
 
662
        except (AttributeError, xml.dom.DOMException,
 
663
                xml.parsers.expat.ExpatError), error:
 
664
            logger.error(u"Failed to override Introspection method",
 
665
                         error)
 
666
        return xmlstring
 
667
 
 
668
 
 
669
class ClientDBus(Client, DBusObjectWithProperties):
 
670
    """A Client class using D-Bus
 
671
    
 
672
    Attributes:
 
673
    dbus_object_path: dbus.ObjectPath
 
674
    bus: dbus.SystemBus()
 
675
    """
 
676
    # dbus.service.Object doesn't use super(), so we can't either.
 
677
    
 
678
    def __init__(self, bus = None, *args, **kwargs):
 
679
        self.bus = bus
 
680
        Client.__init__(self, *args, **kwargs)
 
681
        # Only now, when this client is initialized, can it show up on
 
682
        # the D-Bus
 
683
        self.dbus_object_path = (dbus.ObjectPath
 
684
                                 (u"/clients/"
 
685
                                  + self.name.replace(u".", u"_")))
 
686
        DBusObjectWithProperties.__init__(self, self.bus,
 
687
                                          self.dbus_object_path)
 
688
    
 
689
    @staticmethod
 
690
    def _datetime_to_dbus(dt, variant_level=0):
 
691
        """Convert a UTC datetime.datetime() to a D-Bus type."""
 
692
        return dbus.String(dt.isoformat(),
 
693
                           variant_level=variant_level)
 
694
    
 
695
    def enable(self):
 
696
        oldstate = getattr(self, u"enabled", False)
 
697
        r = Client.enable(self)
 
698
        if oldstate != self.enabled:
 
699
            # Emit D-Bus signals
 
700
            self.PropertyChanged(dbus.String(u"enabled"),
 
701
                                 dbus.Boolean(True, variant_level=1))
 
702
            self.PropertyChanged(
 
703
                dbus.String(u"last_enabled"),
 
704
                self._datetime_to_dbus(self.last_enabled,
 
705
                                       variant_level=1))
 
706
        return r
 
707
    
 
708
    def disable(self, signal = True):
 
709
        oldstate = getattr(self, u"enabled", False)
 
710
        r = Client.disable(self)
 
711
        if signal and oldstate != self.enabled:
 
712
            # Emit D-Bus signal
 
713
            self.PropertyChanged(dbus.String(u"enabled"),
 
714
                                 dbus.Boolean(False, variant_level=1))
 
715
        return r
 
716
    
 
717
    def __del__(self, *args, **kwargs):
 
718
        try:
 
719
            self.remove_from_connection()
 
720
        except LookupError:
 
721
            pass
 
722
        if hasattr(DBusObjectWithProperties, u"__del__"):
 
723
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
724
        Client.__del__(self, *args, **kwargs)
 
725
    
 
726
    def checker_callback(self, pid, condition, command,
 
727
                         *args, **kwargs):
 
728
        self.checker_callback_tag = None
 
729
        self.checker = None
 
730
        # Emit D-Bus signal
 
731
        self.PropertyChanged(dbus.String(u"checker_running"),
 
732
                             dbus.Boolean(False, variant_level=1))
 
733
        if os.WIFEXITED(condition):
 
734
            exitstatus = os.WEXITSTATUS(condition)
 
735
            # Emit D-Bus signal
 
736
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
737
                                  dbus.Int64(condition),
 
738
                                  dbus.String(command))
 
739
        else:
 
740
            # Emit D-Bus signal
 
741
            self.CheckerCompleted(dbus.Int16(-1),
 
742
                                  dbus.Int64(condition),
 
743
                                  dbus.String(command))
 
744
        
 
745
        return Client.checker_callback(self, pid, condition, command,
 
746
                                       *args, **kwargs)
 
747
    
 
748
    def checked_ok(self, *args, **kwargs):
 
749
        r = Client.checked_ok(self, *args, **kwargs)
 
750
        # Emit D-Bus signal
 
751
        self.PropertyChanged(
 
752
            dbus.String(u"last_checked_ok"),
 
753
            (self._datetime_to_dbus(self.last_checked_ok,
 
754
                                    variant_level=1)))
 
755
        return r
 
756
    
 
757
    def start_checker(self, *args, **kwargs):
 
758
        old_checker = self.checker
 
759
        if self.checker is not None:
 
760
            old_checker_pid = self.checker.pid
 
761
        else:
 
762
            old_checker_pid = None
 
763
        r = Client.start_checker(self, *args, **kwargs)
 
764
        # Only if new checker process was started
 
765
        if (self.checker is not None
 
766
            and old_checker_pid != self.checker.pid):
 
767
            # Emit D-Bus signal
 
768
            self.CheckerStarted(self.current_checker_command)
 
769
            self.PropertyChanged(
 
770
                dbus.String(u"checker_running"),
 
771
                dbus.Boolean(True, variant_level=1))
 
772
        return r
 
773
    
 
774
    def stop_checker(self, *args, **kwargs):
 
775
        old_checker = getattr(self, u"checker", None)
 
776
        r = Client.stop_checker(self, *args, **kwargs)
 
777
        if (old_checker is not None
 
778
            and getattr(self, u"checker", None) is None):
 
779
            self.PropertyChanged(dbus.String(u"checker_running"),
 
780
                                 dbus.Boolean(False, variant_level=1))
 
781
        return r
 
782
    
 
783
    ## D-Bus methods & signals
 
784
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
785
    
 
786
    # CheckedOK - method
 
787
    @dbus.service.method(_interface)
 
788
    def CheckedOK(self):
 
789
        return self.checked_ok()
 
790
    
 
791
    # CheckerCompleted - signal
 
792
    @dbus.service.signal(_interface, signature=u"nxs")
 
793
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
794
        "D-Bus signal"
 
795
        pass
 
796
    
 
797
    # CheckerStarted - signal
 
798
    @dbus.service.signal(_interface, signature=u"s")
 
799
    def CheckerStarted(self, command):
 
800
        "D-Bus signal"
 
801
        pass
 
802
    
 
803
    # PropertyChanged - signal
 
804
    @dbus.service.signal(_interface, signature=u"sv")
 
805
    def PropertyChanged(self, property, value):
 
806
        "D-Bus signal"
 
807
        pass
 
808
    
 
809
    # GotSecret - signal
 
810
    @dbus.service.signal(_interface)
 
811
    def GotSecret(self):
 
812
        "D-Bus signal"
 
813
        pass
 
814
    
 
815
    # Rejected - signal
 
816
    @dbus.service.signal(_interface)
 
817
    def Rejected(self):
 
818
        "D-Bus signal"
 
819
        pass
 
820
    
 
821
    # Enable - method
 
822
    @dbus.service.method(_interface)
 
823
    def Enable(self):
 
824
        "D-Bus method"
 
825
        self.enable()
 
826
    
 
827
    # StartChecker - method
 
828
    @dbus.service.method(_interface)
 
829
    def StartChecker(self):
 
830
        "D-Bus method"
 
831
        self.start_checker()
 
832
    
 
833
    # Disable - method
 
834
    @dbus.service.method(_interface)
 
835
    def Disable(self):
 
836
        "D-Bus method"
 
837
        self.disable()
 
838
    
 
839
    # StopChecker - method
 
840
    @dbus.service.method(_interface)
 
841
    def StopChecker(self):
 
842
        self.stop_checker()
 
843
    
 
844
    # name - property
 
845
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
846
    def name_dbus_property(self):
 
847
        return dbus.String(self.name)
 
848
    
 
849
    # fingerprint - property
 
850
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
851
    def fingerprint_dbus_property(self):
 
852
        return dbus.String(self.fingerprint)
 
853
    
 
854
    # host - property
 
855
    @dbus_service_property(_interface, signature=u"s",
 
856
                           access=u"readwrite")
 
857
    def host_dbus_property(self, value=None):
 
858
        if value is None:       # get
 
859
            return dbus.String(self.host)
 
860
        self.host = value
 
861
        # Emit D-Bus signal
 
862
        self.PropertyChanged(dbus.String(u"host"),
 
863
                             dbus.String(value, variant_level=1))
 
864
    
 
865
    # created - property
 
866
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
867
    def created_dbus_property(self):
 
868
        return dbus.String(self._datetime_to_dbus(self.created))
 
869
    
 
870
    # last_enabled - property
 
871
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
872
    def last_enabled_dbus_property(self):
 
873
        if self.last_enabled is None:
 
874
            return dbus.String(u"")
 
875
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
 
876
    
 
877
    # enabled - property
 
878
    @dbus_service_property(_interface, signature=u"b",
 
879
                           access=u"readwrite")
 
880
    def enabled_dbus_property(self, value=None):
 
881
        if value is None:       # get
 
882
            return dbus.Boolean(self.enabled)
 
883
        if value:
 
884
            self.enable()
 
885
        else:
 
886
            self.disable()
 
887
    
 
888
    # last_checked_ok - property
 
889
    @dbus_service_property(_interface, signature=u"s",
 
890
                           access=u"readwrite")
 
891
    def last_checked_ok_dbus_property(self, value=None):
 
892
        if value is not None:
 
893
            self.checked_ok()
 
894
            return
 
895
        if self.last_checked_ok is None:
 
896
            return dbus.String(u"")
 
897
        return dbus.String(self._datetime_to_dbus(self
 
898
                                                  .last_checked_ok))
 
899
    
 
900
    # timeout - property
 
901
    @dbus_service_property(_interface, signature=u"t",
 
902
                           access=u"readwrite")
 
903
    def timeout_dbus_property(self, value=None):
 
904
        if value is None:       # get
 
905
            return dbus.UInt64(self.timeout_milliseconds())
 
906
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
907
        # Emit D-Bus signal
 
908
        self.PropertyChanged(dbus.String(u"timeout"),
 
909
                             dbus.UInt64(value, variant_level=1))
 
910
        if getattr(self, u"disable_initiator_tag", None) is None:
 
911
            return
 
912
        # Reschedule timeout
 
913
        gobject.source_remove(self.disable_initiator_tag)
 
914
        self.disable_initiator_tag = None
 
915
        time_to_die = (self.
 
916
                       _timedelta_to_milliseconds((self
 
917
                                                   .last_checked_ok
 
918
                                                   + self.timeout)
 
919
                                                  - datetime.datetime
 
920
                                                  .utcnow()))
 
921
        if time_to_die <= 0:
 
922
            # The timeout has passed
 
923
            self.disable()
 
924
        else:
 
925
            self.disable_initiator_tag = (gobject.timeout_add
 
926
                                          (time_to_die, self.disable))
 
927
    
 
928
    # interval - property
 
929
    @dbus_service_property(_interface, signature=u"t",
 
930
                           access=u"readwrite")
 
931
    def interval_dbus_property(self, value=None):
 
932
        if value is None:       # get
 
933
            return dbus.UInt64(self.interval_milliseconds())
 
934
        self.interval = datetime.timedelta(0, 0, 0, value)
 
935
        # Emit D-Bus signal
 
936
        self.PropertyChanged(dbus.String(u"interval"),
 
937
                             dbus.UInt64(value, variant_level=1))
 
938
        if getattr(self, u"checker_initiator_tag", None) is None:
 
939
            return
 
940
        # Reschedule checker run
 
941
        gobject.source_remove(self.checker_initiator_tag)
 
942
        self.checker_initiator_tag = (gobject.timeout_add
 
943
                                      (value, self.start_checker))
 
944
        self.start_checker()    # Start one now, too
 
945
 
 
946
    # checker - property
 
947
    @dbus_service_property(_interface, signature=u"s",
 
948
                           access=u"readwrite")
 
949
    def checker_dbus_property(self, value=None):
 
950
        if value is None:       # get
 
951
            return dbus.String(self.checker_command)
 
952
        self.checker_command = value
 
953
        # Emit D-Bus signal
 
954
        self.PropertyChanged(dbus.String(u"checker"),
 
955
                             dbus.String(self.checker_command,
 
956
                                         variant_level=1))
 
957
    
 
958
    # checker_running - property
 
959
    @dbus_service_property(_interface, signature=u"b",
 
960
                           access=u"readwrite")
 
961
    def checker_running_dbus_property(self, value=None):
 
962
        if value is None:       # get
 
963
            return dbus.Boolean(self.checker is not None)
 
964
        if value:
 
965
            self.start_checker()
 
966
        else:
 
967
            self.stop_checker()
 
968
    
 
969
    # object_path - property
 
970
    @dbus_service_property(_interface, signature=u"o", access=u"read")
 
971
    def object_path_dbus_property(self):
 
972
        return self.dbus_object_path # is already a dbus.ObjectPath
 
973
    
 
974
    # secret = property
 
975
    @dbus_service_property(_interface, signature=u"ay",
 
976
                           access=u"write", byte_arrays=True)
 
977
    def secret_dbus_property(self, value):
 
978
        self.secret = str(value)
 
979
    
 
980
    del _interface
 
981
 
 
982
 
 
983
class ClientHandler(socketserver.BaseRequestHandler, object):
 
984
    """A class to handle client connections.
 
985
    
 
986
    Instantiated once for each connection to handle it.
427
987
    Note: This will run in its own forked process."""
428
988
    
429
989
    def handle(self):
430
990
        logger.info(u"TCP connection from: %s",
431
 
                     unicode(self.client_address))
432
 
        session = gnutls.connection.ClientSession\
433
 
                  (self.request, gnutls.connection.X509Credentials())
434
 
        
435
 
        line = self.request.makefile().readline()
436
 
        logger.debug(u"Protocol version: %r", line)
437
 
        try:
438
 
            if int(line.strip().split()[0]) > 1:
439
 
                raise RuntimeError
440
 
        except (ValueError, IndexError, RuntimeError), error:
441
 
            logger.error(u"Unknown protocol version: %s", error)
442
 
            return
443
 
        
444
 
        # Note: gnutls.connection.X509Credentials is really a generic
445
 
        # GnuTLS certificate credentials object so long as no X.509
446
 
        # keys are added to it.  Therefore, we can use it here despite
447
 
        # using OpenPGP certificates.
448
 
        
449
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
450
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
451
 
        #                "+DHE-DSS"))
452
 
        priority = "NORMAL"             # Fallback default, since this
453
 
                                        # MUST be set.
454
 
        if self.server.settings["priority"]:
455
 
            priority = self.server.settings["priority"]
456
 
        gnutls.library.functions.gnutls_priority_set_direct\
457
 
            (session._c_object, priority, None);
458
 
        
459
 
        try:
460
 
            session.handshake()
461
 
        except gnutls.errors.GNUTLSError, error:
462
 
            logger.warning(u"Handshake failed: %s", error)
463
 
            # Do not run session.bye() here: the session is not
464
 
            # established.  Just abandon the request.
465
 
            return
466
 
        try:
467
 
            fpr = fingerprint(peer_certificate(session))
468
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
469
 
            logger.warning(u"Bad certificate: %s", error)
470
 
            session.bye()
471
 
            return
472
 
        logger.debug(u"Fingerprint: %s", fpr)
473
 
        client = None
474
 
        for c in self.server.clients:
475
 
            if c.fingerprint == fpr:
476
 
                client = c
477
 
                break
478
 
        if not client:
479
 
            logger.warning(u"Client not found for fingerprint: %s",
480
 
                           fpr)
481
 
            session.bye()
482
 
            return
483
 
        # Have to check if client.still_valid(), since it is possible
484
 
        # that the client timed out while establishing the GnuTLS
485
 
        # session.
486
 
        if not client.still_valid():
487
 
            logger.warning(u"Client %(name)s is invalid",
488
 
                           vars(client))
489
 
            session.bye()
490
 
            return
491
 
        sent_size = 0
492
 
        while sent_size < len(client.secret):
493
 
            sent = session.send(client.secret[sent_size:])
494
 
            logger.debug(u"Sent: %d, remaining: %d",
495
 
                         sent, len(client.secret)
496
 
                         - (sent_size + sent))
497
 
            sent_size += sent
498
 
        session.bye()
499
 
 
500
 
 
501
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
502
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
991
                    unicode(self.client_address))
 
992
        logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
 
993
        # Open IPC pipe to parent process
 
994
        with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
 
995
            session = (gnutls.connection
 
996
                       .ClientSession(self.request,
 
997
                                      gnutls.connection
 
998
                                      .X509Credentials()))
 
999
            
 
1000
            line = self.request.makefile().readline()
 
1001
            logger.debug(u"Protocol version: %r", line)
 
1002
            try:
 
1003
                if int(line.strip().split()[0]) > 1:
 
1004
                    raise RuntimeError
 
1005
            except (ValueError, IndexError, RuntimeError), error:
 
1006
                logger.error(u"Unknown protocol version: %s", error)
 
1007
                return
 
1008
            
 
1009
            # Note: gnutls.connection.X509Credentials is really a
 
1010
            # generic GnuTLS certificate credentials object so long as
 
1011
            # no X.509 keys are added to it.  Therefore, we can use it
 
1012
            # here despite using OpenPGP certificates.
 
1013
            
 
1014
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
 
1015
            #                      u"+AES-256-CBC", u"+SHA1",
 
1016
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
 
1017
            #                      u"+DHE-DSS"))
 
1018
            # Use a fallback default, since this MUST be set.
 
1019
            priority = self.server.gnutls_priority
 
1020
            if priority is None:
 
1021
                priority = u"NORMAL"
 
1022
            (gnutls.library.functions
 
1023
             .gnutls_priority_set_direct(session._c_object,
 
1024
                                         priority, None))
 
1025
            
 
1026
            try:
 
1027
                session.handshake()
 
1028
            except gnutls.errors.GNUTLSError, error:
 
1029
                logger.warning(u"Handshake failed: %s", error)
 
1030
                # Do not run session.bye() here: the session is not
 
1031
                # established.  Just abandon the request.
 
1032
                return
 
1033
            logger.debug(u"Handshake succeeded")
 
1034
            try:
 
1035
                fpr = self.fingerprint(self.peer_certificate(session))
 
1036
            except (TypeError, gnutls.errors.GNUTLSError), error:
 
1037
                logger.warning(u"Bad certificate: %s", error)
 
1038
                session.bye()
 
1039
                return
 
1040
            logger.debug(u"Fingerprint: %s", fpr)
 
1041
            
 
1042
            for c in self.server.clients:
 
1043
                if c.fingerprint == fpr:
 
1044
                    client = c
 
1045
                    break
 
1046
            else:
 
1047
                ipc.write(u"NOTFOUND %s %s\n"
 
1048
                          % (fpr, unicode(self.client_address)))
 
1049
                session.bye()
 
1050
                return
 
1051
            # Have to check if client.still_valid(), since it is
 
1052
            # possible that the client timed out while establishing
 
1053
            # the GnuTLS session.
 
1054
            if not client.still_valid():
 
1055
                ipc.write(u"INVALID %s\n" % client.name)
 
1056
                session.bye()
 
1057
                return
 
1058
            ipc.write(u"SENDING %s\n" % client.name)
 
1059
            sent_size = 0
 
1060
            while sent_size < len(client.secret):
 
1061
                sent = session.send(client.secret[sent_size:])
 
1062
                logger.debug(u"Sent: %d, remaining: %d",
 
1063
                             sent, len(client.secret)
 
1064
                             - (sent_size + sent))
 
1065
                sent_size += sent
 
1066
            session.bye()
 
1067
    
 
1068
    @staticmethod
 
1069
    def peer_certificate(session):
 
1070
        "Return the peer's OpenPGP certificate as a bytestring"
 
1071
        # If not an OpenPGP certificate...
 
1072
        if (gnutls.library.functions
 
1073
            .gnutls_certificate_type_get(session._c_object)
 
1074
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
1075
            # ...do the normal thing
 
1076
            return session.peer_certificate
 
1077
        list_size = ctypes.c_uint(1)
 
1078
        cert_list = (gnutls.library.functions
 
1079
                     .gnutls_certificate_get_peers
 
1080
                     (session._c_object, ctypes.byref(list_size)))
 
1081
        if not bool(cert_list) and list_size.value != 0:
 
1082
            raise gnutls.errors.GNUTLSError(u"error getting peer"
 
1083
                                            u" certificate")
 
1084
        if list_size.value == 0:
 
1085
            return None
 
1086
        cert = cert_list[0]
 
1087
        return ctypes.string_at(cert.data, cert.size)
 
1088
    
 
1089
    @staticmethod
 
1090
    def fingerprint(openpgp):
 
1091
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
1092
        # New GnuTLS "datum" with the OpenPGP public key
 
1093
        datum = (gnutls.library.types
 
1094
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
1095
                                             ctypes.POINTER
 
1096
                                             (ctypes.c_ubyte)),
 
1097
                                 ctypes.c_uint(len(openpgp))))
 
1098
        # New empty GnuTLS certificate
 
1099
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
1100
        (gnutls.library.functions
 
1101
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
1102
        # Import the OpenPGP public key into the certificate
 
1103
        (gnutls.library.functions
 
1104
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
1105
                                    gnutls.library.constants
 
1106
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
1107
        # Verify the self signature in the key
 
1108
        crtverify = ctypes.c_uint()
 
1109
        (gnutls.library.functions
 
1110
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
1111
                                         ctypes.byref(crtverify)))
 
1112
        if crtverify.value != 0:
 
1113
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1114
            raise (gnutls.errors.CertificateSecurityError
 
1115
                   (u"Verify failed"))
 
1116
        # New buffer for the fingerprint
 
1117
        buf = ctypes.create_string_buffer(20)
 
1118
        buf_len = ctypes.c_size_t()
 
1119
        # Get the fingerprint from the certificate into the buffer
 
1120
        (gnutls.library.functions
 
1121
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
1122
                                             ctypes.byref(buf_len)))
 
1123
        # Deinit the certificate
 
1124
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1125
        # Convert the buffer to a Python bytestring
 
1126
        fpr = ctypes.string_at(buf, buf_len.value)
 
1127
        # Convert the bytestring to hexadecimal notation
 
1128
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
1129
        return hex_fpr
 
1130
 
 
1131
 
 
1132
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
 
1133
    """Like socketserver.ForkingMixIn, but also pass a pipe."""
 
1134
    def process_request(self, request, client_address):
 
1135
        """Overrides and wraps the original process_request().
 
1136
        
 
1137
        This function creates a new pipe in self.pipe
 
1138
        """
 
1139
        self.pipe = os.pipe()
 
1140
        super(ForkingMixInWithPipe,
 
1141
              self).process_request(request, client_address)
 
1142
        os.close(self.pipe[1])  # close write end
 
1143
        self.add_pipe(self.pipe[0])
 
1144
    def add_pipe(self, pipe):
 
1145
        """Dummy function; override as necessary"""
 
1146
        os.close(pipe)
 
1147
 
 
1148
 
 
1149
class IPv6_TCPServer(ForkingMixInWithPipe,
 
1150
                     socketserver.TCPServer, object):
 
1151
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
1152
    
503
1153
    Attributes:
504
 
        settings:       Server settings
505
 
        clients:        Set() of Client objects
 
1154
        enabled:        Boolean; whether this server is activated yet
 
1155
        interface:      None or a network interface name (string)
 
1156
        use_ipv6:       Boolean; to use IPv6 or not
506
1157
    """
507
 
    address_family = socket.AF_INET6
508
 
    def __init__(self, *args, **kwargs):
509
 
        if "settings" in kwargs:
510
 
            self.settings = kwargs["settings"]
511
 
            del kwargs["settings"]
512
 
        if "clients" in kwargs:
513
 
            self.clients = kwargs["clients"]
514
 
            del kwargs["clients"]
515
 
        return super(type(self), self).__init__(*args, **kwargs)
 
1158
    def __init__(self, server_address, RequestHandlerClass,
 
1159
                 interface=None, use_ipv6=True):
 
1160
        self.interface = interface
 
1161
        if use_ipv6:
 
1162
            self.address_family = socket.AF_INET6
 
1163
        socketserver.TCPServer.__init__(self, server_address,
 
1164
                                        RequestHandlerClass)
516
1165
    def server_bind(self):
517
1166
        """This overrides the normal server_bind() function
518
1167
        to bind to an interface if one was specified, and also NOT to
519
1168
        bind to an address or port if they were not specified."""
520
 
        if self.settings["interface"]:
521
 
            # 25 is from /usr/include/asm-i486/socket.h
522
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
523
 
            try:
524
 
                self.socket.setsockopt(socket.SOL_SOCKET,
525
 
                                       SO_BINDTODEVICE,
526
 
                                       self.settings["interface"])
527
 
            except socket.error, error:
528
 
                if error[0] == errno.EPERM:
529
 
                    logger.error(u"No permission to"
530
 
                                 u" bind to interface %s",
531
 
                                 self.settings["interface"])
532
 
                else:
533
 
                    raise error
 
1169
        if self.interface is not None:
 
1170
            if SO_BINDTODEVICE is None:
 
1171
                logger.error(u"SO_BINDTODEVICE does not exist;"
 
1172
                             u" cannot bind to interface %s",
 
1173
                             self.interface)
 
1174
            else:
 
1175
                try:
 
1176
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
1177
                                           SO_BINDTODEVICE,
 
1178
                                           str(self.interface
 
1179
                                               + u'\0'))
 
1180
                except socket.error, error:
 
1181
                    if error[0] == errno.EPERM:
 
1182
                        logger.error(u"No permission to"
 
1183
                                     u" bind to interface %s",
 
1184
                                     self.interface)
 
1185
                    elif error[0] == errno.ENOPROTOOPT:
 
1186
                        logger.error(u"SO_BINDTODEVICE not available;"
 
1187
                                     u" cannot bind to interface %s",
 
1188
                                     self.interface)
 
1189
                    else:
 
1190
                        raise
534
1191
        # Only bind(2) the socket if we really need to.
535
1192
        if self.server_address[0] or self.server_address[1]:
536
1193
            if not self.server_address[0]:
537
 
                in6addr_any = "::"
538
 
                self.server_address = (in6addr_any,
 
1194
                if self.address_family == socket.AF_INET6:
 
1195
                    any_address = u"::" # in6addr_any
 
1196
                else:
 
1197
                    any_address = socket.INADDR_ANY
 
1198
                self.server_address = (any_address,
539
1199
                                       self.server_address[1])
540
1200
            elif not self.server_address[1]:
541
1201
                self.server_address = (self.server_address[0],
542
1202
                                       0)
543
 
#                 if self.settings["interface"]:
 
1203
#                 if self.interface:
544
1204
#                     self.server_address = (self.server_address[0],
545
1205
#                                            0, # port
546
1206
#                                            0, # flowinfo
547
1207
#                                            if_nametoindex
548
 
#                                            (self.settings
549
 
#                                             ["interface"]))
550
 
            return super(type(self), self).server_bind()
 
1208
#                                            (self.interface))
 
1209
            return socketserver.TCPServer.server_bind(self)
 
1210
 
 
1211
 
 
1212
class MandosServer(IPv6_TCPServer):
 
1213
    """Mandos server.
 
1214
    
 
1215
    Attributes:
 
1216
        clients:        set of Client objects
 
1217
        gnutls_priority GnuTLS priority string
 
1218
        use_dbus:       Boolean; to emit D-Bus signals or not
 
1219
    
 
1220
    Assumes a gobject.MainLoop event loop.
 
1221
    """
 
1222
    def __init__(self, server_address, RequestHandlerClass,
 
1223
                 interface=None, use_ipv6=True, clients=None,
 
1224
                 gnutls_priority=None, use_dbus=True):
 
1225
        self.enabled = False
 
1226
        self.clients = clients
 
1227
        if self.clients is None:
 
1228
            self.clients = set()
 
1229
        self.use_dbus = use_dbus
 
1230
        self.gnutls_priority = gnutls_priority
 
1231
        IPv6_TCPServer.__init__(self, server_address,
 
1232
                                RequestHandlerClass,
 
1233
                                interface = interface,
 
1234
                                use_ipv6 = use_ipv6)
 
1235
    def server_activate(self):
 
1236
        if self.enabled:
 
1237
            return socketserver.TCPServer.server_activate(self)
 
1238
    def enable(self):
 
1239
        self.enabled = True
 
1240
    def add_pipe(self, pipe):
 
1241
        # Call "handle_ipc" for both data and EOF events
 
1242
        gobject.io_add_watch(pipe, gobject.IO_IN | gobject.IO_HUP,
 
1243
                             self.handle_ipc)
 
1244
    def handle_ipc(self, source, condition, file_objects={}):
 
1245
        condition_names = {
 
1246
            gobject.IO_IN: u"IN",   # There is data to read.
 
1247
            gobject.IO_OUT: u"OUT", # Data can be written (without
 
1248
                                    # blocking).
 
1249
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
 
1250
            gobject.IO_ERR: u"ERR", # Error condition.
 
1251
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
 
1252
                                    # broken, usually for pipes and
 
1253
                                    # sockets).
 
1254
            }
 
1255
        conditions_string = ' | '.join(name
 
1256
                                       for cond, name in
 
1257
                                       condition_names.iteritems()
 
1258
                                       if cond & condition)
 
1259
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
 
1260
                     conditions_string)
 
1261
        
 
1262
        # Turn the pipe file descriptor into a Python file object
 
1263
        if source not in file_objects:
 
1264
            file_objects[source] = os.fdopen(source, u"r", 1)
 
1265
        
 
1266
        # Read a line from the file object
 
1267
        cmdline = file_objects[source].readline()
 
1268
        if not cmdline:             # Empty line means end of file
 
1269
            # close the IPC pipe
 
1270
            file_objects[source].close()
 
1271
            del file_objects[source]
 
1272
            
 
1273
            # Stop calling this function
 
1274
            return False
 
1275
        
 
1276
        logger.debug(u"IPC command: %r", cmdline)
 
1277
        
 
1278
        # Parse and act on command
 
1279
        cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
 
1280
        
 
1281
        if cmd == u"NOTFOUND":
 
1282
            logger.warning(u"Client not found for fingerprint: %s",
 
1283
                           args)
 
1284
            if self.use_dbus:
 
1285
                # Emit D-Bus signal
 
1286
                mandos_dbus_service.ClientNotFound(args)
 
1287
        elif cmd == u"INVALID":
 
1288
            for client in self.clients:
 
1289
                if client.name == args:
 
1290
                    logger.warning(u"Client %s is invalid", args)
 
1291
                    if self.use_dbus:
 
1292
                        # Emit D-Bus signal
 
1293
                        client.Rejected()
 
1294
                    break
 
1295
            else:
 
1296
                logger.error(u"Unknown client %s is invalid", args)
 
1297
        elif cmd == u"SENDING":
 
1298
            for client in self.clients:
 
1299
                if client.name == args:
 
1300
                    logger.info(u"Sending secret to %s", client.name)
 
1301
                    client.checked_ok()
 
1302
                    if self.use_dbus:
 
1303
                        # Emit D-Bus signal
 
1304
                        client.GotSecret()
 
1305
                    break
 
1306
            else:
 
1307
                logger.error(u"Sending secret to unknown client %s",
 
1308
                             args)
 
1309
        else:
 
1310
            logger.error(u"Unknown IPC command: %r", cmdline)
 
1311
        
 
1312
        # Keep calling this function
 
1313
        return True
551
1314
 
552
1315
 
553
1316
def string_to_delta(interval):
554
1317
    """Parse a string and return a datetime.timedelta
555
 
 
556
 
    >>> string_to_delta('7d')
 
1318
    
 
1319
    >>> string_to_delta(u'7d')
557
1320
    datetime.timedelta(7)
558
 
    >>> string_to_delta('60s')
 
1321
    >>> string_to_delta(u'60s')
559
1322
    datetime.timedelta(0, 60)
560
 
    >>> string_to_delta('60m')
 
1323
    >>> string_to_delta(u'60m')
561
1324
    datetime.timedelta(0, 3600)
562
 
    >>> string_to_delta('24h')
 
1325
    >>> string_to_delta(u'24h')
563
1326
    datetime.timedelta(1)
564
1327
    >>> string_to_delta(u'1w')
565
1328
    datetime.timedelta(7)
 
1329
    >>> string_to_delta(u'5m 30s')
 
1330
    datetime.timedelta(0, 330)
566
1331
    """
567
 
    try:
568
 
        suffix=unicode(interval[-1])
569
 
        value=int(interval[:-1])
570
 
        if suffix == u"d":
571
 
            delta = datetime.timedelta(value)
572
 
        elif suffix == u"s":
573
 
            delta = datetime.timedelta(0, value)
574
 
        elif suffix == u"m":
575
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
576
 
        elif suffix == u"h":
577
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
578
 
        elif suffix == u"w":
579
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
580
 
        else:
 
1332
    timevalue = datetime.timedelta(0)
 
1333
    for s in interval.split():
 
1334
        try:
 
1335
            suffix = unicode(s[-1])
 
1336
            value = int(s[:-1])
 
1337
            if suffix == u"d":
 
1338
                delta = datetime.timedelta(value)
 
1339
            elif suffix == u"s":
 
1340
                delta = datetime.timedelta(0, value)
 
1341
            elif suffix == u"m":
 
1342
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
1343
            elif suffix == u"h":
 
1344
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
1345
            elif suffix == u"w":
 
1346
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
1347
            else:
 
1348
                raise ValueError
 
1349
        except (ValueError, IndexError):
581
1350
            raise ValueError
582
 
    except (ValueError, IndexError):
583
 
        raise ValueError
584
 
    return delta
585
 
 
586
 
 
587
 
def server_state_changed(state):
588
 
    """Derived from the Avahi example code"""
589
 
    if state == avahi.SERVER_COLLISION:
590
 
        logger.error(u"Server name collision")
591
 
        service.remove()
592
 
    elif state == avahi.SERVER_RUNNING:
593
 
        service.add()
594
 
 
595
 
 
596
 
def entry_group_state_changed(state, error):
597
 
    """Derived from the Avahi example code"""
598
 
    logger.debug(u"state change: %i", state)
599
 
    
600
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
601
 
        logger.debug(u"Service established.")
602
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
603
 
        logger.warning(u"Service name collision.")
604
 
        service.rename()
605
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
606
 
        logger.critical(u"Error in group state changed %s",
607
 
                        unicode(error))
608
 
        raise AvahiGroupError("State changed: %s", str(error))
 
1351
        timevalue += delta
 
1352
    return timevalue
 
1353
 
609
1354
 
610
1355
def if_nametoindex(interface):
611
 
    """Call the C function if_nametoindex(), or equivalent"""
 
1356
    """Call the C function if_nametoindex(), or equivalent
 
1357
    
 
1358
    Note: This function cannot accept a unicode string."""
612
1359
    global if_nametoindex
613
1360
    try:
614
 
        if "ctypes.util" not in sys.modules:
615
 
            import ctypes.util
616
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
617
 
            (ctypes.util.find_library("c")).if_nametoindex
 
1361
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1362
                          (ctypes.util.find_library(u"c"))
 
1363
                          .if_nametoindex)
618
1364
    except (OSError, AttributeError):
619
 
        if "struct" not in sys.modules:
620
 
            import struct
621
 
        if "fcntl" not in sys.modules:
622
 
            import fcntl
 
1365
        logger.warning(u"Doing if_nametoindex the hard way")
623
1366
        def if_nametoindex(interface):
624
1367
            "Get an interface index the hard way, i.e. using fcntl()"
625
1368
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
626
 
            s = socket.socket()
627
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
628
 
                                struct.pack("16s16x", interface))
629
 
            s.close()
630
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
1369
            with closing(socket.socket()) as s:
 
1370
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1371
                                    struct.pack(str(u"16s16x"),
 
1372
                                                interface))
 
1373
            interface_index = struct.unpack(str(u"I"),
 
1374
                                            ifreq[16:20])[0]
631
1375
            return interface_index
632
1376
    return if_nametoindex(interface)
633
1377
 
634
1378
 
635
1379
def daemon(nochdir = False, noclose = False):
636
1380
    """See daemon(3).  Standard BSD Unix function.
 
1381
    
637
1382
    This should really exist as os.daemon, but it doesn't (yet)."""
638
1383
    if os.fork():
639
1384
        sys.exit()
640
1385
    os.setsid()
641
1386
    if not nochdir:
642
 
        os.chdir("/")
 
1387
        os.chdir(u"/")
643
1388
    if os.fork():
644
1389
        sys.exit()
645
1390
    if not noclose:
647
1392
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
648
1393
        if not stat.S_ISCHR(os.fstat(null).st_mode):
649
1394
            raise OSError(errno.ENODEV,
650
 
                          "/dev/null not a character device")
 
1395
                          u"%s not a character device"
 
1396
                          % os.path.devnull)
651
1397
        os.dup2(null, sys.stdin.fileno())
652
1398
        os.dup2(null, sys.stdout.fileno())
653
1399
        os.dup2(null, sys.stderr.fileno())
656
1402
 
657
1403
 
658
1404
def main():
659
 
    global main_loop_started
660
 
    main_loop_started = False
661
 
    
662
 
    parser = OptionParser(version = "%%prog %s" % version)
663
 
    parser.add_option("-i", "--interface", type="string",
664
 
                      metavar="IF", help="Bind to interface IF")
665
 
    parser.add_option("-a", "--address", type="string",
666
 
                      help="Address to listen for requests on")
667
 
    parser.add_option("-p", "--port", type="int",
668
 
                      help="Port number to receive requests on")
669
 
    parser.add_option("--check", action="store_true", default=False,
670
 
                      help="Run self-test")
671
 
    parser.add_option("--debug", action="store_true",
672
 
                      help="Debug mode; run in foreground and log to"
673
 
                      " terminal")
674
 
    parser.add_option("--priority", type="string", help="GnuTLS"
675
 
                      " priority string (see GnuTLS documentation)")
676
 
    parser.add_option("--servicename", type="string", metavar="NAME",
677
 
                      help="Zeroconf service name")
678
 
    parser.add_option("--configdir", type="string",
679
 
                      default="/etc/mandos", metavar="DIR",
680
 
                      help="Directory to search for configuration"
681
 
                      " files")
682
 
    (options, args) = parser.parse_args()
 
1405
    
 
1406
    ##################################################################
 
1407
    # Parsing of options, both command line and config file
 
1408
    
 
1409
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
1410
    parser.add_option("-i", u"--interface", type=u"string",
 
1411
                      metavar="IF", help=u"Bind to interface IF")
 
1412
    parser.add_option("-a", u"--address", type=u"string",
 
1413
                      help=u"Address to listen for requests on")
 
1414
    parser.add_option("-p", u"--port", type=u"int",
 
1415
                      help=u"Port number to receive requests on")
 
1416
    parser.add_option("--check", action=u"store_true",
 
1417
                      help=u"Run self-test")
 
1418
    parser.add_option("--debug", action=u"store_true",
 
1419
                      help=u"Debug mode; run in foreground and log to"
 
1420
                      u" terminal")
 
1421
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
 
1422
                      u" priority string (see GnuTLS documentation)")
 
1423
    parser.add_option("--servicename", type=u"string",
 
1424
                      metavar=u"NAME", help=u"Zeroconf service name")
 
1425
    parser.add_option("--configdir", type=u"string",
 
1426
                      default=u"/etc/mandos", metavar=u"DIR",
 
1427
                      help=u"Directory to search for configuration"
 
1428
                      u" files")
 
1429
    parser.add_option("--no-dbus", action=u"store_false",
 
1430
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
 
1431
                      u" system bus interface")
 
1432
    parser.add_option("--no-ipv6", action=u"store_false",
 
1433
                      dest=u"use_ipv6", help=u"Do not use IPv6")
 
1434
    options = parser.parse_args()[0]
683
1435
    
684
1436
    if options.check:
685
1437
        import doctest
687
1439
        sys.exit()
688
1440
    
689
1441
    # Default values for config file for server-global settings
690
 
    server_defaults = { "interface": "",
691
 
                        "address": "",
692
 
                        "port": "",
693
 
                        "debug": "False",
694
 
                        "priority":
695
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
696
 
                        "servicename": "Mandos",
 
1442
    server_defaults = { u"interface": u"",
 
1443
                        u"address": u"",
 
1444
                        u"port": u"",
 
1445
                        u"debug": u"False",
 
1446
                        u"priority":
 
1447
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
1448
                        u"servicename": u"Mandos",
 
1449
                        u"use_dbus": u"True",
 
1450
                        u"use_ipv6": u"True",
697
1451
                        }
698
1452
    
699
1453
    # Parse config file for server-global settings
700
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
1454
    server_config = configparser.SafeConfigParser(server_defaults)
701
1455
    del server_defaults
702
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
1456
    server_config.read(os.path.join(options.configdir,
 
1457
                                    u"mandos.conf"))
703
1458
    # Convert the SafeConfigParser object to a dict
704
1459
    server_settings = server_config.defaults()
705
 
    # Use getboolean on the boolean config option
706
 
    server_settings["debug"] = server_config.getboolean\
707
 
                               ("DEFAULT", "debug")
 
1460
    # Use the appropriate methods on the non-string config options
 
1461
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
 
1462
        server_settings[option] = server_config.getboolean(u"DEFAULT",
 
1463
                                                           option)
 
1464
    if server_settings["port"]:
 
1465
        server_settings["port"] = server_config.getint(u"DEFAULT",
 
1466
                                                       u"port")
708
1467
    del server_config
709
1468
    
710
1469
    # Override the settings from the config file with command line
711
1470
    # options, if set.
712
 
    for option in ("interface", "address", "port", "debug",
713
 
                   "priority", "servicename", "configdir"):
 
1471
    for option in (u"interface", u"address", u"port", u"debug",
 
1472
                   u"priority", u"servicename", u"configdir",
 
1473
                   u"use_dbus", u"use_ipv6"):
714
1474
        value = getattr(options, option)
715
1475
        if value is not None:
716
1476
            server_settings[option] = value
717
1477
    del options
 
1478
    # Force all strings to be unicode
 
1479
    for option in server_settings.keys():
 
1480
        if type(server_settings[option]) is str:
 
1481
            server_settings[option] = unicode(server_settings[option])
718
1482
    # Now we have our good server settings in "server_settings"
719
1483
    
720
 
    debug = server_settings["debug"]
 
1484
    ##################################################################
 
1485
    
 
1486
    # For convenience
 
1487
    debug = server_settings[u"debug"]
 
1488
    use_dbus = server_settings[u"use_dbus"]
 
1489
    use_ipv6 = server_settings[u"use_ipv6"]
721
1490
    
722
1491
    if not debug:
723
1492
        syslogger.setLevel(logging.WARNING)
724
1493
        console.setLevel(logging.WARNING)
725
1494
    
726
 
    if server_settings["servicename"] != "Mandos":
727
 
        syslogger.setFormatter(logging.Formatter\
728
 
                               ('Mandos (%s): %%(levelname)s:'
729
 
                                ' %%(message)s'
730
 
                                % server_settings["servicename"]))
 
1495
    if server_settings[u"servicename"] != u"Mandos":
 
1496
        syslogger.setFormatter(logging.Formatter
 
1497
                               (u'Mandos (%s) [%%(process)d]:'
 
1498
                                u' %%(levelname)s: %%(message)s'
 
1499
                                % server_settings[u"servicename"]))
731
1500
    
732
1501
    # Parse config file with clients
733
 
    client_defaults = { "timeout": "1h",
734
 
                        "interval": "5m",
735
 
                        "checker": "fping -q -- %%(host)s",
 
1502
    client_defaults = { u"timeout": u"1h",
 
1503
                        u"interval": u"5m",
 
1504
                        u"checker": u"fping -q -- %%(host)s",
 
1505
                        u"host": u"",
736
1506
                        }
737
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
738
 
    client_config.read(os.path.join(server_settings["configdir"],
739
 
                                    "clients.conf"))
740
 
    
741
 
    global service
742
 
    service = AvahiService(name = server_settings["servicename"],
743
 
                           type = "_mandos._tcp", );
744
 
    if server_settings["interface"]:
745
 
        service.interface = if_nametoindex(server_settings["interface"])
 
1507
    client_config = configparser.SafeConfigParser(client_defaults)
 
1508
    client_config.read(os.path.join(server_settings[u"configdir"],
 
1509
                                    u"clients.conf"))
 
1510
    
 
1511
    global mandos_dbus_service
 
1512
    mandos_dbus_service = None
 
1513
    
 
1514
    tcp_server = MandosServer((server_settings[u"address"],
 
1515
                               server_settings[u"port"]),
 
1516
                              ClientHandler,
 
1517
                              interface=server_settings[u"interface"],
 
1518
                              use_ipv6=use_ipv6,
 
1519
                              gnutls_priority=
 
1520
                              server_settings[u"priority"],
 
1521
                              use_dbus=use_dbus)
 
1522
    pidfilename = u"/var/run/mandos.pid"
 
1523
    try:
 
1524
        pidfile = open(pidfilename, u"w")
 
1525
    except IOError:
 
1526
        logger.error(u"Could not open file %r", pidfilename)
 
1527
    
 
1528
    try:
 
1529
        uid = pwd.getpwnam(u"_mandos").pw_uid
 
1530
        gid = pwd.getpwnam(u"_mandos").pw_gid
 
1531
    except KeyError:
 
1532
        try:
 
1533
            uid = pwd.getpwnam(u"mandos").pw_uid
 
1534
            gid = pwd.getpwnam(u"mandos").pw_gid
 
1535
        except KeyError:
 
1536
            try:
 
1537
                uid = pwd.getpwnam(u"nobody").pw_uid
 
1538
                gid = pwd.getpwnam(u"nobody").pw_gid
 
1539
            except KeyError:
 
1540
                uid = 65534
 
1541
                gid = 65534
 
1542
    try:
 
1543
        os.setgid(gid)
 
1544
        os.setuid(uid)
 
1545
    except OSError, error:
 
1546
        if error[0] != errno.EPERM:
 
1547
            raise error
 
1548
    
 
1549
    # Enable all possible GnuTLS debugging
 
1550
    if debug:
 
1551
        # "Use a log level over 10 to enable all debugging options."
 
1552
        # - GnuTLS manual
 
1553
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1554
        
 
1555
        @gnutls.library.types.gnutls_log_func
 
1556
        def debug_gnutls(level, string):
 
1557
            logger.debug(u"GnuTLS: %s", string[:-1])
 
1558
        
 
1559
        (gnutls.library.functions
 
1560
         .gnutls_global_set_log_function(debug_gnutls))
746
1561
    
747
1562
    global main_loop
748
 
    global bus
749
 
    global server
750
1563
    # From the Avahi example code
751
1564
    DBusGMainLoop(set_as_default=True )
752
1565
    main_loop = gobject.MainLoop()
753
1566
    bus = dbus.SystemBus()
754
 
    server = dbus.Interface(
755
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
 
            avahi.DBUS_INTERFACE_SERVER )
757
1567
    # End of Avahi example code
758
 
    
759
 
    clients = Set()
760
 
    def remove_from_clients(client):
761
 
        clients.remove(client)
762
 
        if not clients:
763
 
            logger.critical(u"No clients left, exiting")
764
 
            sys.exit()
765
 
    
766
 
    clients.update(Set(Client(name = section,
767
 
                              stop_hook = remove_from_clients,
768
 
                              config
769
 
                              = dict(client_config.items(section)))
770
 
                       for section in client_config.sections()))
771
 
    if not clients:
772
 
        logger.critical(u"No clients defined")
773
 
        sys.exit(1)
774
 
    
775
 
    if not debug:
 
1568
    if use_dbus:
 
1569
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1570
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1571
    service = AvahiService(name = server_settings[u"servicename"],
 
1572
                           servicetype = u"_mandos._tcp",
 
1573
                           protocol = protocol, bus = bus)
 
1574
    if server_settings["interface"]:
 
1575
        service.interface = (if_nametoindex
 
1576
                             (str(server_settings[u"interface"])))
 
1577
    
 
1578
    client_class = Client
 
1579
    if use_dbus:
 
1580
        client_class = functools.partial(ClientDBus, bus = bus)
 
1581
    tcp_server.clients.update(set(
 
1582
            client_class(name = section,
 
1583
                         config= dict(client_config.items(section)))
 
1584
            for section in client_config.sections()))
 
1585
    if not tcp_server.clients:
 
1586
        logger.warning(u"No clients defined")
 
1587
    
 
1588
    if debug:
 
1589
        # Redirect stdin so all checkers get /dev/null
 
1590
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1591
        os.dup2(null, sys.stdin.fileno())
 
1592
        if null > 2:
 
1593
            os.close(null)
 
1594
    else:
 
1595
        # No console logging
776
1596
        logger.removeHandler(console)
 
1597
        # Close all input and output, do double fork, etc.
777
1598
        daemon()
778
1599
    
779
 
    pidfilename = "/var/run/mandos/mandos.pid"
780
 
    pid = os.getpid()
781
1600
    try:
782
 
        pidfile = open(pidfilename, "w")
783
 
        pidfile.write(str(pid) + "\n")
784
 
        pidfile.close()
 
1601
        with closing(pidfile):
 
1602
            pid = os.getpid()
 
1603
            pidfile.write(str(pid) + "\n")
785
1604
        del pidfile
786
 
    except IOError, err:
787
 
        logger.error(u"Could not write %s file with PID %d",
788
 
                     pidfilename, os.getpid())
 
1605
    except IOError:
 
1606
        logger.error(u"Could not write to file %r with PID %d",
 
1607
                     pidfilename, pid)
 
1608
    except NameError:
 
1609
        # "pidfile" was never created
 
1610
        pass
 
1611
    del pidfilename
789
1612
    
790
1613
    def cleanup():
791
1614
        "Cleanup function; run on exit"
792
 
        global group
793
 
        # From the Avahi example code
794
 
        if not group is None:
795
 
            group.Free()
796
 
            group = None
797
 
        # End of Avahi example code
 
1615
        service.cleanup()
798
1616
        
799
 
        while clients:
800
 
            client = clients.pop()
801
 
            client.stop_hook = None
802
 
            client.stop()
 
1617
        while tcp_server.clients:
 
1618
            client = tcp_server.clients.pop()
 
1619
            client.disable_hook = None
 
1620
            client.disable()
803
1621
    
804
1622
    atexit.register(cleanup)
805
1623
    
808
1626
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
809
1627
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
810
1628
    
811
 
    for client in clients:
812
 
        client.start()
813
 
    
814
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
815
 
                                 server_settings["port"]),
816
 
                                tcp_handler,
817
 
                                settings=server_settings,
818
 
                                clients=clients)
 
1629
    if use_dbus:
 
1630
        class MandosDBusService(dbus.service.Object):
 
1631
            """A D-Bus proxy object"""
 
1632
            def __init__(self):
 
1633
                dbus.service.Object.__init__(self, bus, u"/")
 
1634
            _interface = u"se.bsnet.fukt.Mandos"
 
1635
            
 
1636
            @dbus.service.signal(_interface, signature=u"oa{sv}")
 
1637
            def ClientAdded(self, objpath, properties):
 
1638
                "D-Bus signal"
 
1639
                pass
 
1640
            
 
1641
            @dbus.service.signal(_interface, signature=u"s")
 
1642
            def ClientNotFound(self, fingerprint):
 
1643
                "D-Bus signal"
 
1644
                pass
 
1645
            
 
1646
            @dbus.service.signal(_interface, signature=u"os")
 
1647
            def ClientRemoved(self, objpath, name):
 
1648
                "D-Bus signal"
 
1649
                pass
 
1650
            
 
1651
            @dbus.service.method(_interface, out_signature=u"ao")
 
1652
            def GetAllClients(self):
 
1653
                "D-Bus method"
 
1654
                return dbus.Array(c.dbus_object_path
 
1655
                                  for c in tcp_server.clients)
 
1656
            
 
1657
            @dbus.service.method(_interface,
 
1658
                                 out_signature=u"a{oa{sv}}")
 
1659
            def GetAllClientsWithProperties(self):
 
1660
                "D-Bus method"
 
1661
                return dbus.Dictionary(
 
1662
                    ((c.dbus_object_path, c.GetAll(u""))
 
1663
                     for c in tcp_server.clients),
 
1664
                    signature=u"oa{sv}")
 
1665
            
 
1666
            @dbus.service.method(_interface, in_signature=u"o")
 
1667
            def RemoveClient(self, object_path):
 
1668
                "D-Bus method"
 
1669
                for c in tcp_server.clients:
 
1670
                    if c.dbus_object_path == object_path:
 
1671
                        tcp_server.clients.remove(c)
 
1672
                        c.remove_from_connection()
 
1673
                        # Don't signal anything except ClientRemoved
 
1674
                        c.disable(signal=False)
 
1675
                        # Emit D-Bus signal
 
1676
                        self.ClientRemoved(object_path, c.name)
 
1677
                        return
 
1678
                raise KeyError
 
1679
            
 
1680
            del _interface
 
1681
        
 
1682
        mandos_dbus_service = MandosDBusService()
 
1683
    
 
1684
    for client in tcp_server.clients:
 
1685
        if use_dbus:
 
1686
            # Emit D-Bus signal
 
1687
            mandos_dbus_service.ClientAdded(client.dbus_object_path,
 
1688
                                            client.GetAll(u""))
 
1689
        client.enable()
 
1690
    
 
1691
    tcp_server.enable()
 
1692
    tcp_server.server_activate()
 
1693
    
819
1694
    # Find out what port we got
820
1695
    service.port = tcp_server.socket.getsockname()[1]
821
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
1696
    if use_ipv6:
 
1697
        logger.info(u"Now listening on address %r, port %d,"
 
1698
                    " flowinfo %d, scope_id %d"
 
1699
                    % tcp_server.socket.getsockname())
 
1700
    else:                       # IPv4
 
1701
        logger.info(u"Now listening on address %r, port %d"
 
1702
                    % tcp_server.socket.getsockname())
823
1703
    
824
1704
    #service.interface = tcp_server.socket.getsockname()[3]
825
1705
    
826
1706
    try:
827
1707
        # From the Avahi example code
828
 
        server.connect_to_signal("StateChanged", server_state_changed)
829
1708
        try:
830
 
            server_state_changed(server.GetState())
 
1709
            service.activate()
831
1710
        except dbus.exceptions.DBusException, error:
832
1711
            logger.critical(u"DBusException: %s", error)
833
1712
            sys.exit(1)
835
1714
        
836
1715
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
1716
                             lambda *args, **kwargs:
838
 
                             tcp_server.handle_request\
839
 
                             (*args[2:], **kwargs) or True)
 
1717
                             (tcp_server.handle_request
 
1718
                              (*args[2:], **kwargs) or True))
840
1719
        
841
1720
        logger.debug(u"Starting main loop")
842
 
        main_loop_started = True
843
1721
        main_loop.run()
844
1722
    except AvahiError, error:
845
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
1723
        logger.critical(u"AvahiError: %s", error)
846
1724
        sys.exit(1)
847
1725
    except KeyboardInterrupt:
848
1726
        if debug:
849
 
            print
 
1727
            print >> sys.stderr
 
1728
        logger.debug(u"Server received KeyboardInterrupt")
 
1729
    logger.debug(u"Server exiting")
850
1730
 
851
1731
if __name__ == '__main__':
852
1732
    main()