/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2008-10-05 17:38:31 UTC
  • Revision ID: teddy@fukt.bsnet.se-20081005173831-fysrfayl4yvhlo6x
* INSTALL: Add instructions on how to set the correct network
           interface on the cient, and also how to test the server and
           verify the password.

* TODO: Clean up old stuff.

* debian/mandos-client.README.Debian: Separate into sections with
                                      headlines.  Add instructions on
                                      how to test the server and
                                      verify the password.

* plugin-runner.conf: Add reminder to update initrd image.

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Lines of Context:
mandos
11
11
# and some lines in "main".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
 
14
# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
16
15
# 
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
31
30
# Contact the authors at <mandos@fukt.bsnet.se>.
32
31
# 
33
32
 
34
 
from __future__ import division, with_statement, absolute_import
 
33
from __future__ import division
35
34
 
36
35
import SocketServer
37
36
import socket
56
55
import logging
57
56
import logging.handlers
58
57
import pwd
59
 
from contextlib import closing
60
58
 
61
59
import dbus
62
 
import dbus.service
63
60
import gobject
64
61
import avahi
65
62
from dbus.mainloop.glib import DBusGMainLoop
66
63
import ctypes
67
64
import ctypes.util
68
65
 
69
 
version = "1.0.3"
 
66
version = "1.0"
70
67
 
71
68
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos: %(levelname)s: %(message)s'))
 
69
syslogger = logging.handlers.SysLogHandler\
 
70
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
71
             address = "/dev/log")
 
72
syslogger.setFormatter(logging.Formatter\
 
73
                        ('Mandos: %(levelname)s: %(message)s'))
77
74
logger.addHandler(syslogger)
78
75
 
79
76
console = logging.StreamHandler()
82
79
logger.addHandler(console)
83
80
 
84
81
class AvahiError(Exception):
85
 
    def __init__(self, value, *args, **kwargs):
 
82
    def __init__(self, value):
86
83
        self.value = value
87
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
88
 
    def __unicode__(self):
89
 
        return unicode(repr(self.value))
 
84
        super(AvahiError, self).__init__()
 
85
    def __str__(self):
 
86
        return repr(self.value)
90
87
 
91
88
class AvahiServiceError(AvahiError):
92
89
    pass
112
109
                  a sensible number of times
113
110
    """
114
111
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 servicetype = None, port = None, TXT = None,
116
 
                 domain = "", host = "", max_renames = 32768):
 
112
                 servicetype = None, port = None, TXT = None, domain = "",
 
113
                 host = "", max_renames = 32768):
117
114
        self.interface = interface
118
115
        self.name = name
119
116
        self.type = servicetype
120
117
        self.port = port
121
 
        self.TXT = TXT if TXT is not None else []
 
118
        if TXT is None:
 
119
            self.TXT = []
 
120
        else:
 
121
            self.TXT = TXT
122
122
        self.domain = domain
123
123
        self.host = host
124
124
        self.rename_count = 0
129
129
            logger.critical(u"No suitable Zeroconf service name found"
130
130
                            u" after %i retries, exiting.",
131
131
                            self.rename_count)
132
 
            raise AvahiServiceError(u"Too many renames")
 
132
            raise AvahiServiceError("Too many renames")
133
133
        self.name = server.GetAlternativeServiceName(self.name)
134
134
        logger.info(u"Changing Zeroconf service name to %r ...",
135
135
                    str(self.name))
136
 
        syslogger.setFormatter(logging.Formatter
 
136
        syslogger.setFormatter(logging.Formatter\
137
137
                               ('Mandos (%s): %%(levelname)s:'
138
 
                                ' %%(message)s' % self.name))
 
138
                               ' %%(message)s' % self.name))
139
139
        self.remove()
140
140
        self.add()
141
141
        self.rename_count += 1
147
147
        """Derived from the Avahi example code"""
148
148
        global group
149
149
        if group is None:
150
 
            group = dbus.Interface(bus.get_object
151
 
                                   (avahi.DBUS_NAME,
 
150
            group = dbus.Interface\
 
151
                    (bus.get_object(avahi.DBUS_NAME,
152
152
                                    server.EntryGroupNew()),
153
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
153
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
154
            group.connect_to_signal('StateChanged',
155
155
                                    entry_group_state_changed)
156
156
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
170
170
# End of Avahi example code
171
171
 
172
172
 
173
 
def _datetime_to_dbus(dt, variant_level=0):
174
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
175
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
176
 
 
177
 
 
178
 
class Client(dbus.service.Object):
 
173
class Client(object):
179
174
    """A representation of a client host served by this server.
180
175
    Attributes:
181
 
    name:       string; from the config file, used in log messages
 
176
    name:      string; from the config file, used in log messages
182
177
    fingerprint: string (40 or 32 hexadecimal digits); used to
183
178
                 uniquely identify the client
184
 
    secret:     bytestring; sent verbatim (over TLS) to client
185
 
    host:       string; available for use by the checker command
186
 
    created:    datetime.datetime(); (UTC) object creation
187
 
    last_enabled: datetime.datetime(); (UTC)
188
 
    enabled:    bool()
189
 
    last_checked_ok: datetime.datetime(); (UTC) or None
190
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
191
 
                                      until this client is invalid
192
 
    interval:   datetime.timedelta(); How often to start a new checker
193
 
    disable_hook:  If set, called by disable() as disable_hook(self)
194
 
    checker:    subprocess.Popen(); a running checker process used
195
 
                                    to see if the client lives.
196
 
                                    'None' if no process is running.
 
179
    secret:    bytestring; sent verbatim (over TLS) to client
 
180
    host:      string; available for use by the checker command
 
181
    created:   datetime.datetime(); object creation, not client host
 
182
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
183
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
184
                                     until this client is invalid
 
185
    interval:  datetime.timedelta(); How often to start a new checker
 
186
    stop_hook: If set, called by stop() as stop_hook(self)
 
187
    checker:   subprocess.Popen(); a running checker process used
 
188
                                   to see if the client lives.
 
189
                                   'None' if no process is running.
197
190
    checker_initiator_tag: a gobject event source tag, or None
198
 
    disable_initiator_tag:    - '' -
 
191
    stop_initiator_tag:    - '' -
199
192
    checker_callback_tag:  - '' -
200
193
    checker_command: string; External command which is run to check if
201
194
                     client lives.  %() expansions are done at
202
195
                     runtime with vars(self) as dict, so that for
203
196
                     instance %(name)s can be used in the command.
204
 
    use_dbus: bool(); Whether to provide D-Bus interface and signals
205
 
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
 
197
    Private attibutes:
 
198
    _timeout: Real variable for 'timeout'
 
199
    _interval: Real variable for 'interval'
 
200
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
201
    _interval_milliseconds: - '' -
206
202
    """
207
 
    def timeout_milliseconds(self):
208
 
        "Return the 'timeout' attribute in milliseconds"
209
 
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
210
 
                + (self.timeout.seconds * 1000)
211
 
                + (self.timeout.microseconds // 1000))
212
 
    
213
 
    def interval_milliseconds(self):
214
 
        "Return the 'interval' attribute in milliseconds"
215
 
        return ((self.interval.days * 24 * 60 * 60 * 1000)
216
 
                + (self.interval.seconds * 1000)
217
 
                + (self.interval.microseconds // 1000))
218
 
    
219
 
    def __init__(self, name = None, disable_hook=None, config=None,
220
 
                 use_dbus=True):
 
203
    def _set_timeout(self, timeout):
 
204
        "Setter function for 'timeout' attribute"
 
205
        self._timeout = timeout
 
206
        self._timeout_milliseconds = ((self.timeout.days
 
207
                                       * 24 * 60 * 60 * 1000)
 
208
                                      + (self.timeout.seconds * 1000)
 
209
                                      + (self.timeout.microseconds
 
210
                                         // 1000))
 
211
    timeout = property(lambda self: self._timeout,
 
212
                       _set_timeout)
 
213
    del _set_timeout
 
214
    def _set_interval(self, interval):
 
215
        "Setter function for 'interval' attribute"
 
216
        self._interval = interval
 
217
        self._interval_milliseconds = ((self.interval.days
 
218
                                        * 24 * 60 * 60 * 1000)
 
219
                                       + (self.interval.seconds
 
220
                                          * 1000)
 
221
                                       + (self.interval.microseconds
 
222
                                          // 1000))
 
223
    interval = property(lambda self: self._interval,
 
224
                        _set_interval)
 
225
    del _set_interval
 
226
    def __init__(self, name = None, stop_hook=None, config=None):
221
227
        """Note: the 'checker' key in 'config' sets the
222
228
        'checker_command' attribute and *not* the 'checker'
223
229
        attribute."""
224
 
        self.name = name
225
230
        if config is None:
226
231
            config = {}
 
232
        self.name = name
227
233
        logger.debug(u"Creating client %r", self.name)
228
 
        self.use_dbus = use_dbus
229
 
        if self.use_dbus:
230
 
            self.dbus_object_path = (dbus.ObjectPath
231
 
                                     ("/Mandos/clients/"
232
 
                                      + self.name.replace(".", "_")))
233
 
            dbus.service.Object.__init__(self, bus,
234
 
                                         self.dbus_object_path)
235
234
        # Uppercase and remove spaces from fingerprint for later
236
235
        # comparison purposes with return value from the fingerprint()
237
236
        # function
238
 
        self.fingerprint = (config["fingerprint"].upper()
239
 
                            .replace(u" ", u""))
 
237
        self.fingerprint = config["fingerprint"].upper()\
 
238
                           .replace(u" ", u"")
240
239
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
241
240
        if "secret" in config:
242
241
            self.secret = config["secret"].decode(u"base64")
243
242
        elif "secfile" in config:
244
 
            with closing(open(os.path.expanduser
245
 
                              (os.path.expandvars
246
 
                               (config["secfile"])))) as secfile:
247
 
                self.secret = secfile.read()
 
243
            secfile = open(os.path.expanduser(os.path.expandvars
 
244
                                              (config["secfile"])))
 
245
            self.secret = secfile.read()
 
246
            secfile.close()
248
247
        else:
249
248
            raise TypeError(u"No secret or secfile for client %s"
250
249
                            % self.name)
251
250
        self.host = config.get("host", "")
252
 
        self.created = datetime.datetime.utcnow()
253
 
        self.enabled = False
254
 
        self.last_enabled = None
 
251
        self.created = datetime.datetime.now()
255
252
        self.last_checked_ok = None
256
253
        self.timeout = string_to_delta(config["timeout"])
257
254
        self.interval = string_to_delta(config["interval"])
258
 
        self.disable_hook = disable_hook
 
255
        self.stop_hook = stop_hook
259
256
        self.checker = None
260
257
        self.checker_initiator_tag = None
261
 
        self.disable_initiator_tag = None
 
258
        self.stop_initiator_tag = None
262
259
        self.checker_callback_tag = None
263
 
        self.checker_command = config["checker"]
264
 
    
265
 
    def enable(self):
 
260
        self.check_command = config["checker"]
 
261
    def start(self):
266
262
        """Start this client's checker and timeout hooks"""
267
 
        self.last_enabled = datetime.datetime.utcnow()
268
263
        # Schedule a new checker to be started an 'interval' from now,
269
264
        # and every interval from then on.
270
 
        self.checker_initiator_tag = (gobject.timeout_add
271
 
                                      (self.interval_milliseconds(),
272
 
                                       self.start_checker))
 
265
        self.checker_initiator_tag = gobject.timeout_add\
 
266
                                     (self._interval_milliseconds,
 
267
                                      self.start_checker)
273
268
        # Also start a new checker *right now*.
274
269
        self.start_checker()
275
 
        # Schedule a disable() when 'timeout' has passed
276
 
        self.disable_initiator_tag = (gobject.timeout_add
277
 
                                   (self.timeout_milliseconds(),
278
 
                                    self.disable))
279
 
        self.enabled = True
280
 
        if self.use_dbus:
281
 
            # Emit D-Bus signals
282
 
            self.PropertyChanged(dbus.String(u"enabled"),
283
 
                                 dbus.Boolean(True, variant_level=1))
284
 
            self.PropertyChanged(dbus.String(u"last_enabled"),
285
 
                                 (_datetime_to_dbus(self.last_enabled,
286
 
                                                    variant_level=1)))
287
 
    
288
 
    def disable(self):
289
 
        """Disable this client."""
290
 
        if not getattr(self, "enabled", False):
 
270
        # Schedule a stop() when 'timeout' has passed
 
271
        self.stop_initiator_tag = gobject.timeout_add\
 
272
                                  (self._timeout_milliseconds,
 
273
                                   self.stop)
 
274
    def stop(self):
 
275
        """Stop this client.
 
276
        The possibility that a client might be restarted is left open,
 
277
        but not currently used."""
 
278
        # If this client doesn't have a secret, it is already stopped.
 
279
        if hasattr(self, "secret") and self.secret:
 
280
            logger.info(u"Stopping client %s", self.name)
 
281
            self.secret = None
 
282
        else:
291
283
            return False
292
 
        logger.info(u"Disabling client %s", self.name)
293
 
        if getattr(self, "disable_initiator_tag", False):
294
 
            gobject.source_remove(self.disable_initiator_tag)
295
 
            self.disable_initiator_tag = None
 
284
        if getattr(self, "stop_initiator_tag", False):
 
285
            gobject.source_remove(self.stop_initiator_tag)
 
286
            self.stop_initiator_tag = None
296
287
        if getattr(self, "checker_initiator_tag", False):
297
288
            gobject.source_remove(self.checker_initiator_tag)
298
289
            self.checker_initiator_tag = None
299
290
        self.stop_checker()
300
 
        if self.disable_hook:
301
 
            self.disable_hook(self)
302
 
        self.enabled = False
303
 
        if self.use_dbus:
304
 
            # Emit D-Bus signal
305
 
            self.PropertyChanged(dbus.String(u"enabled"),
306
 
                                 dbus.Boolean(False, variant_level=1))
 
291
        if self.stop_hook:
 
292
            self.stop_hook(self)
307
293
        # Do not run this again if called by a gobject.timeout_add
308
294
        return False
309
 
    
310
295
    def __del__(self):
311
 
        self.disable_hook = None
312
 
        self.disable()
313
 
    
314
 
    def checker_callback(self, pid, condition, command):
 
296
        self.stop_hook = None
 
297
        self.stop()
 
298
    def checker_callback(self, pid, condition):
315
299
        """The checker has completed, so take appropriate actions."""
 
300
        now = datetime.datetime.now()
316
301
        self.checker_callback_tag = None
317
302
        self.checker = None
318
 
        if self.use_dbus:
319
 
            # Emit D-Bus signal
320
 
            self.PropertyChanged(dbus.String(u"checker_running"),
321
 
                                 dbus.Boolean(False, variant_level=1))
322
 
        if (os.WIFEXITED(condition)
323
 
            and (os.WEXITSTATUS(condition) == 0)):
 
303
        if os.WIFEXITED(condition) \
 
304
               and (os.WEXITSTATUS(condition) == 0):
324
305
            logger.info(u"Checker for %(name)s succeeded",
325
306
                        vars(self))
326
 
            if self.use_dbus:
327
 
                # Emit D-Bus signal
328
 
                self.CheckerCompleted(dbus.Boolean(True),
329
 
                                      dbus.UInt16(condition),
330
 
                                      dbus.String(command))
331
 
            self.bump_timeout()
 
307
            self.last_checked_ok = now
 
308
            gobject.source_remove(self.stop_initiator_tag)
 
309
            self.stop_initiator_tag = gobject.timeout_add\
 
310
                                      (self._timeout_milliseconds,
 
311
                                       self.stop)
332
312
        elif not os.WIFEXITED(condition):
333
313
            logger.warning(u"Checker for %(name)s crashed?",
334
314
                           vars(self))
335
 
            if self.use_dbus:
336
 
                # Emit D-Bus signal
337
 
                self.CheckerCompleted(dbus.Boolean(False),
338
 
                                      dbus.UInt16(condition),
339
 
                                      dbus.String(command))
340
315
        else:
341
316
            logger.info(u"Checker for %(name)s failed",
342
317
                        vars(self))
343
 
            if self.use_dbus:
344
 
                # Emit D-Bus signal
345
 
                self.CheckerCompleted(dbus.Boolean(False),
346
 
                                      dbus.UInt16(condition),
347
 
                                      dbus.String(command))
348
 
    
349
 
    def bump_timeout(self):
350
 
        """Bump up the timeout for this client.
351
 
        This should only be called when the client has been seen,
352
 
        alive and well.
353
 
        """
354
 
        self.last_checked_ok = datetime.datetime.utcnow()
355
 
        gobject.source_remove(self.disable_initiator_tag)
356
 
        self.disable_initiator_tag = (gobject.timeout_add
357
 
                                      (self.timeout_milliseconds(),
358
 
                                       self.disable))
359
 
        if self.use_dbus:
360
 
            # Emit D-Bus signal
361
 
            self.PropertyChanged(
362
 
                dbus.String(u"last_checked_ok"),
363
 
                (_datetime_to_dbus(self.last_checked_ok,
364
 
                                   variant_level=1)))
365
 
    
366
318
    def start_checker(self):
367
319
        """Start a new checker subprocess if one is not running.
368
320
        If a checker already exists, leave it running and do
377
329
        # is as it should be.
378
330
        if self.checker is None:
379
331
            try:
380
 
                # In case checker_command has exactly one % operator
381
 
                command = self.checker_command % self.host
 
332
                # In case check_command has exactly one % operator
 
333
                command = self.check_command % self.host
382
334
            except TypeError:
383
335
                # Escape attributes for the shell
384
336
                escaped_attrs = dict((key, re.escape(str(val)))
385
337
                                     for key, val in
386
338
                                     vars(self).iteritems())
387
339
                try:
388
 
                    command = self.checker_command % escaped_attrs
 
340
                    command = self.check_command % escaped_attrs
389
341
                except TypeError, error:
390
342
                    logger.error(u'Could not format string "%s":'
391
 
                                 u' %s', self.checker_command, error)
 
343
                                 u' %s', self.check_command, error)
392
344
                    return True # Try again later
393
345
            try:
394
346
                logger.info(u"Starting checker %r for %s",
400
352
                self.checker = subprocess.Popen(command,
401
353
                                                close_fds=True,
402
354
                                                shell=True, cwd="/")
403
 
                if self.use_dbus:
404
 
                    # Emit D-Bus signal
405
 
                    self.CheckerStarted(command)
406
 
                    self.PropertyChanged(
407
 
                        dbus.String("checker_running"),
408
 
                        dbus.Boolean(True, variant_level=1))
409
 
                self.checker_callback_tag = (gobject.child_watch_add
410
 
                                             (self.checker.pid,
411
 
                                              self.checker_callback,
412
 
                                              data=command))
 
355
                self.checker_callback_tag = gobject.child_watch_add\
 
356
                                            (self.checker.pid,
 
357
                                             self.checker_callback)
413
358
            except OSError, error:
414
359
                logger.error(u"Failed to start subprocess: %s",
415
360
                             error)
416
361
        # Re-run this periodically if run by gobject.timeout_add
417
362
        return True
418
 
    
419
363
    def stop_checker(self):
420
364
        """Force the checker process, if any, to stop."""
421
365
        if self.checker_callback_tag:
433
377
            if error.errno != errno.ESRCH: # No such process
434
378
                raise
435
379
        self.checker = None
436
 
        if self.use_dbus:
437
 
            self.PropertyChanged(dbus.String(u"checker_running"),
438
 
                                 dbus.Boolean(False, variant_level=1))
439
 
    
440
380
    def still_valid(self):
441
381
        """Has the timeout not yet passed for this client?"""
442
 
        if not getattr(self, "enabled", False):
443
 
            return False
444
 
        now = datetime.datetime.utcnow()
 
382
        now = datetime.datetime.now()
445
383
        if self.last_checked_ok is None:
446
384
            return now < (self.created + self.timeout)
447
385
        else:
448
386
            return now < (self.last_checked_ok + self.timeout)
449
 
    
450
 
    ## D-Bus methods & signals
451
 
    _interface = u"org.mandos_system.Mandos.Client"
452
 
    
453
 
    # BumpTimeout - method
454
 
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
455
 
    BumpTimeout.__name__ = "BumpTimeout"
456
 
    
457
 
    # CheckerCompleted - signal
458
 
    @dbus.service.signal(_interface, signature="bqs")
459
 
    def CheckerCompleted(self, success, condition, command):
460
 
        "D-Bus signal"
461
 
        pass
462
 
    
463
 
    # CheckerStarted - signal
464
 
    @dbus.service.signal(_interface, signature="s")
465
 
    def CheckerStarted(self, command):
466
 
        "D-Bus signal"
467
 
        pass
468
 
    
469
 
    # GetAllProperties - method
470
 
    @dbus.service.method(_interface, out_signature="a{sv}")
471
 
    def GetAllProperties(self):
472
 
        "D-Bus method"
473
 
        return dbus.Dictionary({
474
 
                dbus.String("name"):
475
 
                    dbus.String(self.name, variant_level=1),
476
 
                dbus.String("fingerprint"):
477
 
                    dbus.String(self.fingerprint, variant_level=1),
478
 
                dbus.String("host"):
479
 
                    dbus.String(self.host, variant_level=1),
480
 
                dbus.String("created"):
481
 
                    _datetime_to_dbus(self.created, variant_level=1),
482
 
                dbus.String("last_enabled"):
483
 
                    (_datetime_to_dbus(self.last_enabled,
484
 
                                       variant_level=1)
485
 
                     if self.last_enabled is not None
486
 
                     else dbus.Boolean(False, variant_level=1)),
487
 
                dbus.String("enabled"):
488
 
                    dbus.Boolean(self.enabled, variant_level=1),
489
 
                dbus.String("last_checked_ok"):
490
 
                    (_datetime_to_dbus(self.last_checked_ok,
491
 
                                       variant_level=1)
492
 
                     if self.last_checked_ok is not None
493
 
                     else dbus.Boolean (False, variant_level=1)),
494
 
                dbus.String("timeout"):
495
 
                    dbus.UInt64(self.timeout_milliseconds(),
496
 
                                variant_level=1),
497
 
                dbus.String("interval"):
498
 
                    dbus.UInt64(self.interval_milliseconds(),
499
 
                                variant_level=1),
500
 
                dbus.String("checker"):
501
 
                    dbus.String(self.checker_command,
502
 
                                variant_level=1),
503
 
                dbus.String("checker_running"):
504
 
                    dbus.Boolean(self.checker is not None,
505
 
                                 variant_level=1),
506
 
                }, signature="sv")
507
 
    
508
 
    # IsStillValid - method
509
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
510
 
                    (still_valid))
511
 
    IsStillValid.__name__ = "IsStillValid"
512
 
    
513
 
    # PropertyChanged - signal
514
 
    @dbus.service.signal(_interface, signature="sv")
515
 
    def PropertyChanged(self, property, value):
516
 
        "D-Bus signal"
517
 
        pass
518
 
    
519
 
    # SetChecker - method
520
 
    @dbus.service.method(_interface, in_signature="s")
521
 
    def SetChecker(self, checker):
522
 
        "D-Bus setter method"
523
 
        self.checker_command = checker
524
 
        # Emit D-Bus signal
525
 
        self.PropertyChanged(dbus.String(u"checker"),
526
 
                             dbus.String(self.checker_command,
527
 
                                         variant_level=1))
528
 
    
529
 
    # SetHost - method
530
 
    @dbus.service.method(_interface, in_signature="s")
531
 
    def SetHost(self, host):
532
 
        "D-Bus setter method"
533
 
        self.host = host
534
 
        # Emit D-Bus signal
535
 
        self.PropertyChanged(dbus.String(u"host"),
536
 
                             dbus.String(self.host, variant_level=1))
537
 
    
538
 
    # SetInterval - method
539
 
    @dbus.service.method(_interface, in_signature="t")
540
 
    def SetInterval(self, milliseconds):
541
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
542
 
        # Emit D-Bus signal
543
 
        self.PropertyChanged(dbus.String(u"interval"),
544
 
                             (dbus.UInt64(self.interval_milliseconds(),
545
 
                                          variant_level=1)))
546
 
    
547
 
    # SetSecret - method
548
 
    @dbus.service.method(_interface, in_signature="ay",
549
 
                         byte_arrays=True)
550
 
    def SetSecret(self, secret):
551
 
        "D-Bus setter method"
552
 
        self.secret = str(secret)
553
 
    
554
 
    # SetTimeout - method
555
 
    @dbus.service.method(_interface, in_signature="t")
556
 
    def SetTimeout(self, milliseconds):
557
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
558
 
        # Emit D-Bus signal
559
 
        self.PropertyChanged(dbus.String(u"timeout"),
560
 
                             (dbus.UInt64(self.timeout_milliseconds(),
561
 
                                          variant_level=1)))
562
 
    
563
 
    # Enable - method
564
 
    Enable = dbus.service.method(_interface)(enable)
565
 
    Enable.__name__ = "Enable"
566
 
    
567
 
    # StartChecker - method
568
 
    @dbus.service.method(_interface)
569
 
    def StartChecker(self):
570
 
        "D-Bus method"
571
 
        self.start_checker()
572
 
    
573
 
    # Disable - method
574
 
    @dbus.service.method(_interface)
575
 
    def Disable(self):
576
 
        "D-Bus method"
577
 
        self.disable()
578
 
    
579
 
    # StopChecker - method
580
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
581
 
    StopChecker.__name__ = "StopChecker"
582
 
    
583
 
    del _interface
584
387
 
585
388
 
586
389
def peer_certificate(session):
587
390
    "Return the peer's OpenPGP certificate as a bytestring"
588
391
    # If not an OpenPGP certificate...
589
 
    if (gnutls.library.functions
590
 
        .gnutls_certificate_type_get(session._c_object)
591
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
392
    if gnutls.library.functions.gnutls_certificate_type_get\
 
393
            (session._c_object) \
 
394
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
592
395
        # ...do the normal thing
593
396
        return session.peer_certificate
594
397
    list_size = ctypes.c_uint()
595
 
    cert_list = (gnutls.library.functions
596
 
                 .gnutls_certificate_get_peers
597
 
                 (session._c_object, ctypes.byref(list_size)))
 
398
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
399
        (session._c_object, ctypes.byref(list_size))
598
400
    if list_size.value == 0:
599
401
        return None
600
402
    cert = cert_list[0]
604
406
def fingerprint(openpgp):
605
407
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
606
408
    # New GnuTLS "datum" with the OpenPGP public key
607
 
    datum = (gnutls.library.types
608
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
609
 
                                         ctypes.POINTER
610
 
                                         (ctypes.c_ubyte)),
611
 
                             ctypes.c_uint(len(openpgp))))
 
409
    datum = gnutls.library.types.gnutls_datum_t\
 
410
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
411
                     ctypes.POINTER(ctypes.c_ubyte)),
 
412
         ctypes.c_uint(len(openpgp)))
612
413
    # New empty GnuTLS certificate
613
414
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
614
 
    (gnutls.library.functions
615
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
415
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
416
        (ctypes.byref(crt))
616
417
    # Import the OpenPGP public key into the certificate
617
 
    (gnutls.library.functions
618
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
619
 
                                gnutls.library.constants
620
 
                                .GNUTLS_OPENPGP_FMT_RAW))
 
418
    gnutls.library.functions.gnutls_openpgp_crt_import\
 
419
                    (crt, ctypes.byref(datum),
 
420
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
621
421
    # Verify the self signature in the key
622
422
    crtverify = ctypes.c_uint()
623
 
    (gnutls.library.functions
624
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
423
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
 
424
        (crt, 0, ctypes.byref(crtverify))
625
425
    if crtverify.value != 0:
626
426
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
627
427
        raise gnutls.errors.CertificateSecurityError("Verify failed")
629
429
    buf = ctypes.create_string_buffer(20)
630
430
    buf_len = ctypes.c_size_t()
631
431
    # Get the fingerprint from the certificate into the buffer
632
 
    (gnutls.library.functions
633
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
634
 
                                         ctypes.byref(buf_len)))
 
432
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
433
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
635
434
    # Deinit the certificate
636
435
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
637
436
    # Convert the buffer to a Python bytestring
648
447
    
649
448
    def handle(self):
650
449
        logger.info(u"TCP connection from: %s",
651
 
                    unicode(self.client_address))
652
 
        session = (gnutls.connection
653
 
                   .ClientSession(self.request,
654
 
                                  gnutls.connection
655
 
                                  .X509Credentials()))
 
450
                     unicode(self.client_address))
 
451
        session = gnutls.connection.ClientSession\
 
452
                  (self.request, gnutls.connection.X509Credentials())
656
453
        
657
454
        line = self.request.makefile().readline()
658
455
        logger.debug(u"Protocol version: %r", line)
671
468
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
672
469
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
673
470
        #                "+DHE-DSS"))
674
 
        # Use a fallback default, since this MUST be set.
675
 
        priority = self.server.settings.get("priority", "NORMAL")
676
 
        (gnutls.library.functions
677
 
         .gnutls_priority_set_direct(session._c_object,
678
 
                                     priority, None))
 
471
        priority = "NORMAL"             # Fallback default, since this
 
472
                                        # MUST be set.
 
473
        if self.server.settings["priority"]:
 
474
            priority = self.server.settings["priority"]
 
475
        gnutls.library.functions.gnutls_priority_set_direct\
 
476
            (session._c_object, priority, None)
679
477
        
680
478
        try:
681
479
            session.handshake()
691
489
            session.bye()
692
490
            return
693
491
        logger.debug(u"Fingerprint: %s", fpr)
 
492
        client = None
694
493
        for c in self.server.clients:
695
494
            if c.fingerprint == fpr:
696
495
                client = c
697
496
                break
698
 
        else:
 
497
        if not client:
699
498
            logger.warning(u"Client not found for fingerprint: %s",
700
499
                           fpr)
701
500
            session.bye()
708
507
                           vars(client))
709
508
            session.bye()
710
509
            return
711
 
        ## This won't work here, since we're in a fork.
712
 
        # client.bump_timeout()
713
510
        sent_size = 0
714
511
        while sent_size < len(client.secret):
715
512
            sent = session.send(client.secret[sent_size:])
720
517
        session.bye()
721
518
 
722
519
 
723
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
724
 
                     SocketServer.TCPServer, object):
 
520
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
725
521
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
726
522
    Attributes:
727
523
        settings:       Server settings
840
636
    elif state == avahi.ENTRY_GROUP_FAILURE:
841
637
        logger.critical(u"Avahi: Error in group state changed %s",
842
638
                        unicode(error))
843
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
639
        raise AvahiGroupError("State changed: %s", str(error))
844
640
 
845
641
def if_nametoindex(interface):
846
642
    """Call the C function if_nametoindex(), or equivalent"""
847
643
    global if_nametoindex
848
644
    try:
849
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
850
 
                          (ctypes.util.find_library("c"))
851
 
                          .if_nametoindex)
 
645
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
646
            (ctypes.util.find_library("c")).if_nametoindex
852
647
    except (OSError, AttributeError):
853
648
        if "struct" not in sys.modules:
854
649
            import struct
857
652
        def if_nametoindex(interface):
858
653
            "Get an interface index the hard way, i.e. using fcntl()"
859
654
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
860
 
            with closing(socket.socket()) as s:
861
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
862
 
                                    struct.pack("16s16x", interface))
 
655
            s = socket.socket()
 
656
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
657
                                struct.pack("16s16x", interface))
 
658
            s.close()
863
659
            interface_index = struct.unpack("I", ifreq[16:20])[0]
864
660
            return interface_index
865
661
    return if_nametoindex(interface)
896
692
                      help="Address to listen for requests on")
897
693
    parser.add_option("-p", "--port", type="int",
898
694
                      help="Port number to receive requests on")
899
 
    parser.add_option("--check", action="store_true",
 
695
    parser.add_option("--check", action="store_true", default=False,
900
696
                      help="Run self-test")
901
697
    parser.add_option("--debug", action="store_true",
902
698
                      help="Debug mode; run in foreground and log to"
909
705
                      default="/etc/mandos", metavar="DIR",
910
706
                      help="Directory to search for configuration"
911
707
                      " files")
912
 
    parser.add_option("--no-dbus", action="store_false",
913
 
                      dest="use_dbus",
914
 
                      help="Do not provide D-Bus system bus"
915
 
                      " interface")
916
708
    options = parser.parse_args()[0]
917
709
    
918
710
    if options.check:
928
720
                        "priority":
929
721
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
930
722
                        "servicename": "Mandos",
931
 
                        "use_dbus": "True",
932
723
                        }
933
724
    
934
725
    # Parse config file for server-global settings
937
728
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
938
729
    # Convert the SafeConfigParser object to a dict
939
730
    server_settings = server_config.defaults()
940
 
    # Use getboolean on the boolean config options
941
 
    server_settings["debug"] = (server_config.getboolean
942
 
                                ("DEFAULT", "debug"))
943
 
    server_settings["use_dbus"] = (server_config.getboolean
944
 
                                   ("DEFAULT", "use_dbus"))
 
731
    # Use getboolean on the boolean config option
 
732
    server_settings["debug"] = server_config.getboolean\
 
733
                               ("DEFAULT", "debug")
945
734
    del server_config
946
735
    
947
736
    # Override the settings from the config file with command line
948
737
    # options, if set.
949
738
    for option in ("interface", "address", "port", "debug",
950
 
                   "priority", "servicename", "configdir",
951
 
                   "use_dbus"):
 
739
                   "priority", "servicename", "configdir"):
952
740
        value = getattr(options, option)
953
741
        if value is not None:
954
742
            server_settings[option] = value
955
743
    del options
956
744
    # Now we have our good server settings in "server_settings"
957
745
    
958
 
    # For convenience
959
746
    debug = server_settings["debug"]
960
 
    use_dbus = server_settings["use_dbus"]
961
747
    
962
748
    if not debug:
963
749
        syslogger.setLevel(logging.WARNING)
964
750
        console.setLevel(logging.WARNING)
965
751
    
966
752
    if server_settings["servicename"] != "Mandos":
967
 
        syslogger.setFormatter(logging.Formatter
 
753
        syslogger.setFormatter(logging.Formatter\
968
754
                               ('Mandos (%s): %%(levelname)s:'
969
755
                                ' %%(message)s'
970
756
                                % server_settings["servicename"]))
972
758
    # Parse config file with clients
973
759
    client_defaults = { "timeout": "1h",
974
760
                        "interval": "5m",
975
 
                        "checker": "fping -q -- %%(host)s",
 
761
                        "checker": "fping -q -- %(host)s",
976
762
                        "host": "",
977
763
                        }
978
764
    client_config = ConfigParser.SafeConfigParser(client_defaults)
991
777
    except IOError, error:
992
778
        logger.error("Could not open file %r", pidfilename)
993
779
    
994
 
    try:
995
 
        uid = pwd.getpwnam("_mandos").pw_uid
996
 
        gid = pwd.getpwnam("_mandos").pw_gid
997
 
    except KeyError:
998
 
        try:
999
 
            uid = pwd.getpwnam("mandos").pw_uid
1000
 
            gid = pwd.getpwnam("mandos").pw_gid
1001
 
        except KeyError:
1002
 
            try:
1003
 
                uid = pwd.getpwnam("nobody").pw_uid
1004
 
                gid = pwd.getpwnam("nogroup").pw_gid
1005
 
            except KeyError:
1006
 
                uid = 65534
1007
 
                gid = 65534
 
780
    uid = 65534
 
781
    gid = 65534
 
782
    try:
 
783
        uid = pwd.getpwnam("mandos").pw_uid
 
784
    except KeyError:
 
785
        try:
 
786
            uid = pwd.getpwnam("nobody").pw_uid
 
787
        except KeyError:
 
788
            pass
 
789
    try:
 
790
        gid = pwd.getpwnam("mandos").pw_gid
 
791
    except KeyError:
 
792
        try:
 
793
            gid = pwd.getpwnam("nogroup").pw_gid
 
794
        except KeyError:
 
795
            pass
1008
796
    try:
1009
797
        os.setuid(uid)
1010
798
        os.setgid(gid)
1016
804
    service = AvahiService(name = server_settings["servicename"],
1017
805
                           servicetype = "_mandos._tcp", )
1018
806
    if server_settings["interface"]:
1019
 
        service.interface = (if_nametoindex
1020
 
                             (server_settings["interface"]))
 
807
        service.interface = if_nametoindex\
 
808
                            (server_settings["interface"])
1021
809
    
1022
810
    global main_loop
1023
811
    global bus
1030
818
                                           avahi.DBUS_PATH_SERVER),
1031
819
                            avahi.DBUS_INTERFACE_SERVER)
1032
820
    # End of Avahi example code
1033
 
    if use_dbus:
1034
 
        bus_name = dbus.service.BusName(u"org.mandos-system.Mandos",
1035
 
                                        bus)
 
821
    
 
822
    def remove_from_clients(client):
 
823
        clients.remove(client)
 
824
        if not clients:
 
825
            logger.critical(u"No clients left, exiting")
 
826
            sys.exit()
1036
827
    
1037
828
    clients.update(Set(Client(name = section,
 
829
                              stop_hook = remove_from_clients,
1038
830
                              config
1039
 
                              = dict(client_config.items(section)),
1040
 
                              use_dbus = use_dbus)
 
831
                              = dict(client_config.items(section)))
1041
832
                       for section in client_config.sections()))
1042
833
    if not clients:
1043
 
        logger.warning(u"No clients defined")
 
834
        logger.critical(u"No clients defined")
 
835
        sys.exit(1)
1044
836
    
1045
837
    if debug:
1046
838
        # Redirect stdin so all checkers get /dev/null
1078
870
        
1079
871
        while clients:
1080
872
            client = clients.pop()
1081
 
            client.disable_hook = None
1082
 
            client.disable()
 
873
            client.stop_hook = None
 
874
            client.stop()
1083
875
    
1084
876
    atexit.register(cleanup)
1085
877
    
1088
880
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1089
881
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1090
882
    
1091
 
    if use_dbus:
1092
 
        class MandosServer(dbus.service.Object):
1093
 
            """A D-Bus proxy object"""
1094
 
            def __init__(self):
1095
 
                dbus.service.Object.__init__(self, bus,
1096
 
                                             "/Mandos")
1097
 
            _interface = u"org.mandos_system.Mandos"
1098
 
 
1099
 
            @dbus.service.signal(_interface, signature="oa{sv}")
1100
 
            def ClientAdded(self, objpath, properties):
1101
 
                "D-Bus signal"
1102
 
                pass
1103
 
 
1104
 
            @dbus.service.signal(_interface, signature="o")
1105
 
            def ClientRemoved(self, objpath):
1106
 
                "D-Bus signal"
1107
 
                pass
1108
 
 
1109
 
            @dbus.service.method(_interface, out_signature="ao")
1110
 
            def GetAllClients(self):
1111
 
                return dbus.Array(c.dbus_object_path for c in clients)
1112
 
 
1113
 
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1114
 
            def GetAllClientsWithProperties(self):
1115
 
                return dbus.Dictionary(
1116
 
                    ((c.dbus_object_path, c.GetAllProperties())
1117
 
                     for c in clients),
1118
 
                    signature="oa{sv}")
1119
 
 
1120
 
            @dbus.service.method(_interface, in_signature="o")
1121
 
            def RemoveClient(self, object_path):
1122
 
                for c in clients:
1123
 
                    if c.dbus_object_path == object_path:
1124
 
                        clients.remove(c)
1125
 
                        # Don't signal anything except ClientRemoved
1126
 
                        c.use_dbus = False
1127
 
                        c.disable()
1128
 
                        # Emit D-Bus signal
1129
 
                        self.ClientRemoved(object_path)
1130
 
                        return
1131
 
                raise KeyError
1132
 
            @dbus.service.method(_interface)
1133
 
            def Quit(self):
1134
 
                main_loop.quit()
1135
 
 
1136
 
            del _interface
1137
 
    
1138
 
        mandos_server = MandosServer()
1139
 
    
1140
883
    for client in clients:
1141
 
        if use_dbus:
1142
 
            # Emit D-Bus signal
1143
 
            mandos_server.ClientAdded(client.dbus_object_path,
1144
 
                                      client.GetAllProperties())
1145
 
        client.enable()
 
884
        client.start()
1146
885
    
1147
886
    tcp_server.enable()
1148
887
    tcp_server.server_activate()
1166
905
        
1167
906
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1168
907
                             lambda *args, **kwargs:
1169
 
                             (tcp_server.handle_request
1170
 
                              (*args[2:], **kwargs) or True))
 
908
                             tcp_server.handle_request\
 
909
                             (*args[2:], **kwargs) or True)
1171
910
        
1172
911
        logger.debug(u"Starting main loop")
1173
912
        main_loop.run()
1174
913
    except AvahiError, error:
1175
 
        logger.critical(u"AvahiError: %s", error)
 
914
        logger.critical(u"AvahiError: %s" + unicode(error))
1176
915
        sys.exit(1)
1177
916
    except KeyboardInterrupt:
1178
917
        if debug: