/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2009-01-18 00:16:57 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090118001657-6mo3ae73ldy5tegf
* debian/mandos-client.postinst: Converted to Bourne shell.  Also
                                 minor message change.
* debian/mandos-client.postrm: Minor message change.
* debian/mandos.postinst: Converted to Bourne shell.  Also minor
                          message change.
* debian/mandos.prerm: Minor message change.

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Lines of Context:
mandos
11
11
# 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
30
31
# Contact the authors at <mandos@fukt.bsnet.se>.
31
32
# 
32
33
 
33
 
from __future__ import division
 
34
from __future__ import division, with_statement, absolute_import
34
35
 
35
36
import SocketServer
36
37
import socket
37
 
import select
38
 
from optparse import OptionParser
 
38
import optparse
39
39
import datetime
40
40
import errno
41
41
import gnutls.crypto
56
56
import logging
57
57
import logging.handlers
58
58
import pwd
 
59
from contextlib import closing
59
60
 
60
61
import dbus
 
62
import dbus.service
61
63
import gobject
62
64
import avahi
63
65
from dbus.mainloop.glib import DBusGMainLoop
64
66
import ctypes
 
67
import ctypes.util
65
68
 
66
 
version = "1.0"
 
69
version = "1.0.5"
67
70
 
68
71
logger = logging.Logger('mandos')
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'))
 
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'))
74
77
logger.addHandler(syslogger)
75
78
 
76
79
console = logging.StreamHandler()
79
82
logger.addHandler(console)
80
83
 
81
84
class AvahiError(Exception):
82
 
    def __init__(self, value):
 
85
    def __init__(self, value, *args, **kwargs):
83
86
        self.value = value
84
 
    def __str__(self):
85
 
        return repr(self.value)
 
87
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
88
    def __unicode__(self):
 
89
        return unicode(repr(self.value))
86
90
 
87
91
class AvahiServiceError(AvahiError):
88
92
    pass
108
112
                  a sensible number of times
109
113
    """
110
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
111
 
                 type = None, port = None, TXT = None, domain = "",
112
 
                 host = "", max_renames = 32768):
 
115
                 servicetype = None, port = None, TXT = None,
 
116
                 domain = "", host = "", max_renames = 32768):
113
117
        self.interface = interface
114
118
        self.name = name
115
 
        self.type = type
 
119
        self.type = servicetype
116
120
        self.port = port
117
 
        if TXT is None:
118
 
            self.TXT = []
119
 
        else:
120
 
            self.TXT = TXT
 
121
        self.TXT = TXT if TXT is not None else []
121
122
        self.domain = domain
122
123
        self.host = host
123
124
        self.rename_count = 0
127
128
        if self.rename_count >= self.max_renames:
128
129
            logger.critical(u"No suitable Zeroconf service name found"
129
130
                            u" after %i retries, exiting.",
130
 
                            rename_count)
131
 
            raise AvahiServiceError("Too many renames")
 
131
                            self.rename_count)
 
132
            raise AvahiServiceError(u"Too many renames")
132
133
        self.name = server.GetAlternativeServiceName(self.name)
133
134
        logger.info(u"Changing Zeroconf service name to %r ...",
134
135
                    str(self.name))
135
 
        syslogger.setFormatter(logging.Formatter\
 
136
        syslogger.setFormatter(logging.Formatter
136
137
                               ('Mandos (%s): %%(levelname)s:'
137
 
                               ' %%(message)s' % self.name))
 
138
                                ' %%(message)s' % self.name))
138
139
        self.remove()
139
140
        self.add()
140
141
        self.rename_count += 1
146
147
        """Derived from the Avahi example code"""
147
148
        global group
148
149
        if group is None:
149
 
            group = dbus.Interface\
150
 
                    (bus.get_object(avahi.DBUS_NAME,
 
150
            group = dbus.Interface(bus.get_object
 
151
                                   (avahi.DBUS_NAME,
151
152
                                    server.EntryGroupNew()),
152
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
153
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
153
154
            group.connect_to_signal('StateChanged',
154
155
                                    entry_group_state_changed)
155
156
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
169
170
# End of Avahi example code
170
171
 
171
172
 
172
 
class Client(object):
 
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
179
    """A representation of a client host served by this server.
174
180
    Attributes:
175
 
    name:      string; from the config file, used in log messages
 
181
    name:       string; from the config file, used in log messages
176
182
    fingerprint: string (40 or 32 hexadecimal digits); used to
177
183
                 uniquely identify the client
178
 
    secret:    bytestring; sent verbatim (over TLS) to client
179
 
    host:      string; available for use by the checker command
180
 
    created:   datetime.datetime(); object creation, not client host
181
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
182
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
183
 
                                     until this client is invalid
184
 
    interval:  datetime.timedelta(); How often to start a new checker
185
 
    stop_hook: If set, called by stop() as stop_hook(self)
186
 
    checker:   subprocess.Popen(); a running checker process used
187
 
                                   to see if the client lives.
188
 
                                   'None' if no process is running.
 
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.
189
197
    checker_initiator_tag: a gobject event source tag, or None
190
 
    stop_initiator_tag:    - '' -
 
198
    disable_initiator_tag:    - '' -
191
199
    checker_callback_tag:  - '' -
192
200
    checker_command: string; External command which is run to check if
193
201
                     client lives.  %() expansions are done at
194
202
                     runtime with vars(self) as dict, so that for
195
203
                     instance %(name)s can be used in the command.
196
 
    Private attibutes:
197
 
    _timeout: Real variable for 'timeout'
198
 
    _interval: Real variable for 'interval'
199
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
200
 
    _interval_milliseconds: - '' -
 
204
    use_dbus: bool(); Whether to provide D-Bus interface and signals
 
205
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
201
206
    """
202
 
    def _set_timeout(self, timeout):
203
 
        "Setter function for 'timeout' attribute"
204
 
        self._timeout = timeout
205
 
        self._timeout_milliseconds = ((self.timeout.days
206
 
                                       * 24 * 60 * 60 * 1000)
207
 
                                      + (self.timeout.seconds * 1000)
208
 
                                      + (self.timeout.microseconds
209
 
                                         // 1000))
210
 
    timeout = property(lambda self: self._timeout,
211
 
                       _set_timeout)
212
 
    del _set_timeout
213
 
    def _set_interval(self, interval):
214
 
        "Setter function for 'interval' attribute"
215
 
        self._interval = interval
216
 
        self._interval_milliseconds = ((self.interval.days
217
 
                                        * 24 * 60 * 60 * 1000)
218
 
                                       + (self.interval.seconds
219
 
                                          * 1000)
220
 
                                       + (self.interval.microseconds
221
 
                                          // 1000))
222
 
    interval = property(lambda self: self._interval,
223
 
                        _set_interval)
224
 
    del _set_interval
225
 
    def __init__(self, name = None, stop_hook=None, config={}):
 
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):
226
221
        """Note: the 'checker' key in 'config' sets the
227
222
        'checker_command' attribute and *not* the 'checker'
228
223
        attribute."""
229
224
        self.name = name
 
225
        if config is None:
 
226
            config = {}
230
227
        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)
231
235
        # Uppercase and remove spaces from fingerprint for later
232
236
        # comparison purposes with return value from the fingerprint()
233
237
        # function
234
 
        self.fingerprint = config["fingerprint"].upper()\
235
 
                           .replace(u" ", u"")
 
238
        self.fingerprint = (config["fingerprint"].upper()
 
239
                            .replace(u" ", u""))
236
240
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
237
241
        if "secret" in config:
238
242
            self.secret = config["secret"].decode(u"base64")
239
243
        elif "secfile" in config:
240
 
            sf = open(config["secfile"])
241
 
            self.secret = sf.read()
242
 
            sf.close()
 
244
            with closing(open(os.path.expanduser
 
245
                              (os.path.expandvars
 
246
                               (config["secfile"])))) as secfile:
 
247
                self.secret = secfile.read()
243
248
        else:
244
249
            raise TypeError(u"No secret or secfile for client %s"
245
250
                            % self.name)
246
251
        self.host = config.get("host", "")
247
 
        self.created = datetime.datetime.now()
 
252
        self.created = datetime.datetime.utcnow()
 
253
        self.enabled = False
 
254
        self.last_enabled = None
248
255
        self.last_checked_ok = None
249
256
        self.timeout = string_to_delta(config["timeout"])
250
257
        self.interval = string_to_delta(config["interval"])
251
 
        self.stop_hook = stop_hook
 
258
        self.disable_hook = disable_hook
252
259
        self.checker = None
253
260
        self.checker_initiator_tag = None
254
 
        self.stop_initiator_tag = None
 
261
        self.disable_initiator_tag = None
255
262
        self.checker_callback_tag = None
256
 
        self.check_command = config["checker"]
257
 
    def start(self):
 
263
        self.checker_command = config["checker"]
 
264
    
 
265
    def enable(self):
258
266
        """Start this client's checker and timeout hooks"""
 
267
        self.last_enabled = datetime.datetime.utcnow()
259
268
        # Schedule a new checker to be started an 'interval' from now,
260
269
        # and every interval from then on.
261
 
        self.checker_initiator_tag = gobject.timeout_add\
262
 
                                     (self._interval_milliseconds,
263
 
                                      self.start_checker)
 
270
        self.checker_initiator_tag = (gobject.timeout_add
 
271
                                      (self.interval_milliseconds(),
 
272
                                       self.start_checker))
264
273
        # Also start a new checker *right now*.
265
274
        self.start_checker()
266
 
        # Schedule a stop() when 'timeout' has passed
267
 
        self.stop_initiator_tag = gobject.timeout_add\
268
 
                                  (self._timeout_milliseconds,
269
 
                                   self.stop)
270
 
    def stop(self):
271
 
        """Stop this client.
272
 
        The possibility that a client might be restarted is left open,
273
 
        but not currently used."""
274
 
        # If this client doesn't have a secret, it is already stopped.
275
 
        if hasattr(self, "secret") and self.secret:
276
 
            logger.info(u"Stopping client %s", self.name)
277
 
            self.secret = None
278
 
        else:
 
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):
279
291
            return False
280
 
        if getattr(self, "stop_initiator_tag", False):
281
 
            gobject.source_remove(self.stop_initiator_tag)
282
 
            self.stop_initiator_tag = None
 
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
283
296
        if getattr(self, "checker_initiator_tag", False):
284
297
            gobject.source_remove(self.checker_initiator_tag)
285
298
            self.checker_initiator_tag = None
286
299
        self.stop_checker()
287
 
        if self.stop_hook:
288
 
            self.stop_hook(self)
 
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))
289
307
        # Do not run this again if called by a gobject.timeout_add
290
308
        return False
 
309
    
291
310
    def __del__(self):
292
 
        self.stop_hook = None
293
 
        self.stop()
294
 
    def checker_callback(self, pid, condition):
 
311
        self.disable_hook = None
 
312
        self.disable()
 
313
    
 
314
    def checker_callback(self, pid, condition, command):
295
315
        """The checker has completed, so take appropriate actions."""
296
 
        now = datetime.datetime.now()
297
316
        self.checker_callback_tag = None
298
317
        self.checker = None
299
 
        if os.WIFEXITED(condition) \
300
 
               and (os.WEXITSTATUS(condition) == 0):
 
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)):
301
324
            logger.info(u"Checker for %(name)s succeeded",
302
325
                        vars(self))
303
 
            self.last_checked_ok = now
304
 
            gobject.source_remove(self.stop_initiator_tag)
305
 
            self.stop_initiator_tag = gobject.timeout_add\
306
 
                                      (self._timeout_milliseconds,
307
 
                                       self.stop)
 
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()
308
332
        elif not os.WIFEXITED(condition):
309
333
            logger.warning(u"Checker for %(name)s crashed?",
310
334
                           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))
311
340
        else:
312
341
            logger.info(u"Checker for %(name)s failed",
313
342
                        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
    
314
366
    def start_checker(self):
315
367
        """Start a new checker subprocess if one is not running.
316
368
        If a checker already exists, leave it running and do
325
377
        # is as it should be.
326
378
        if self.checker is None:
327
379
            try:
328
 
                # In case check_command has exactly one % operator
329
 
                command = self.check_command % self.host
 
380
                # In case checker_command has exactly one % operator
 
381
                command = self.checker_command % self.host
330
382
            except TypeError:
331
383
                # Escape attributes for the shell
332
384
                escaped_attrs = dict((key, re.escape(str(val)))
333
385
                                     for key, val in
334
386
                                     vars(self).iteritems())
335
387
                try:
336
 
                    command = self.check_command % escaped_attrs
 
388
                    command = self.checker_command % escaped_attrs
337
389
                except TypeError, error:
338
390
                    logger.error(u'Could not format string "%s":'
339
 
                                 u' %s', self.check_command, error)
 
391
                                 u' %s', self.checker_command, error)
340
392
                    return True # Try again later
341
393
            try:
342
394
                logger.info(u"Starting checker %r for %s",
348
400
                self.checker = subprocess.Popen(command,
349
401
                                                close_fds=True,
350
402
                                                shell=True, cwd="/")
351
 
                self.checker_callback_tag = gobject.child_watch_add\
352
 
                                            (self.checker.pid,
353
 
                                             self.checker_callback)
 
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))
354
413
            except OSError, error:
355
414
                logger.error(u"Failed to start subprocess: %s",
356
415
                             error)
357
416
        # Re-run this periodically if run by gobject.timeout_add
358
417
        return True
 
418
    
359
419
    def stop_checker(self):
360
420
        """Force the checker process, if any, to stop."""
361
421
        if self.checker_callback_tag:
373
433
            if error.errno != errno.ESRCH: # No such process
374
434
                raise
375
435
        self.checker = None
 
436
        if self.use_dbus:
 
437
            self.PropertyChanged(dbus.String(u"checker_running"),
 
438
                                 dbus.Boolean(False, variant_level=1))
 
439
    
376
440
    def still_valid(self):
377
441
        """Has the timeout not yet passed for this client?"""
378
 
        now = datetime.datetime.now()
 
442
        if not getattr(self, "enabled", False):
 
443
            return False
 
444
        now = datetime.datetime.utcnow()
379
445
        if self.last_checked_ok is None:
380
446
            return now < (self.created + self.timeout)
381
447
        else:
382
448
            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
383
584
 
384
585
 
385
586
def peer_certificate(session):
386
587
    "Return the peer's OpenPGP certificate as a bytestring"
387
588
    # If not an OpenPGP certificate...
388
 
    if gnutls.library.functions.gnutls_certificate_type_get\
389
 
            (session._c_object) \
390
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
589
    if (gnutls.library.functions
 
590
        .gnutls_certificate_type_get(session._c_object)
 
591
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
391
592
        # ...do the normal thing
392
593
        return session.peer_certificate
393
594
    list_size = ctypes.c_uint()
394
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
395
 
        (session._c_object, ctypes.byref(list_size))
 
595
    cert_list = (gnutls.library.functions
 
596
                 .gnutls_certificate_get_peers
 
597
                 (session._c_object, ctypes.byref(list_size)))
396
598
    if list_size.value == 0:
397
599
        return None
398
600
    cert = cert_list[0]
402
604
def fingerprint(openpgp):
403
605
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
404
606
    # New GnuTLS "datum" with the OpenPGP public key
405
 
    datum = gnutls.library.types.gnutls_datum_t\
406
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
407
 
                     ctypes.POINTER(ctypes.c_ubyte)),
408
 
         ctypes.c_uint(len(openpgp)))
 
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
612
    # New empty GnuTLS certificate
410
613
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
411
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
412
 
        (ctypes.byref(crt))
 
614
    (gnutls.library.functions
 
615
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
413
616
    # Import the OpenPGP public key into the certificate
414
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
415
 
                    (crt, ctypes.byref(datum),
416
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
617
    (gnutls.library.functions
 
618
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
619
                                gnutls.library.constants
 
620
                                .GNUTLS_OPENPGP_FMT_RAW))
417
621
    # Verify the self signature in the key
418
 
    crtverify = ctypes.c_uint();
419
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
420
 
        (crt, 0, ctypes.byref(crtverify))
 
622
    crtverify = ctypes.c_uint()
 
623
    (gnutls.library.functions
 
624
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
421
625
    if crtverify.value != 0:
422
626
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
423
627
        raise gnutls.errors.CertificateSecurityError("Verify failed")
424
628
    # New buffer for the fingerprint
425
 
    buffer = ctypes.create_string_buffer(20)
426
 
    buffer_length = ctypes.c_size_t()
 
629
    buf = ctypes.create_string_buffer(20)
 
630
    buf_len = ctypes.c_size_t()
427
631
    # Get the fingerprint from the certificate into the buffer
428
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
429
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
632
    (gnutls.library.functions
 
633
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
634
                                         ctypes.byref(buf_len)))
430
635
    # Deinit the certificate
431
636
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
432
637
    # Convert the buffer to a Python bytestring
433
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
638
    fpr = ctypes.string_at(buf, buf_len.value)
434
639
    # Convert the bytestring to hexadecimal notation
435
640
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
436
641
    return hex_fpr
437
642
 
438
643
 
439
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
644
class TCP_handler(SocketServer.BaseRequestHandler, object):
440
645
    """A TCP request handler class.
441
646
    Instantiated by IPv6_TCPServer for each request to handle it.
442
647
    Note: This will run in its own forked process."""
443
648
    
444
649
    def handle(self):
445
650
        logger.info(u"TCP connection from: %s",
446
 
                     unicode(self.client_address))
447
 
        session = gnutls.connection.ClientSession\
448
 
                  (self.request, gnutls.connection.X509Credentials())
 
651
                    unicode(self.client_address))
 
652
        session = (gnutls.connection
 
653
                   .ClientSession(self.request,
 
654
                                  gnutls.connection
 
655
                                  .X509Credentials()))
449
656
        
450
657
        line = self.request.makefile().readline()
451
658
        logger.debug(u"Protocol version: %r", line)
464
671
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
465
672
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
466
673
        #                "+DHE-DSS"))
467
 
        priority = "NORMAL"             # Fallback default, since this
468
 
                                        # MUST be set.
469
 
        if self.server.settings["priority"]:
470
 
            priority = self.server.settings["priority"]
471
 
        gnutls.library.functions.gnutls_priority_set_direct\
472
 
            (session._c_object, priority, None);
 
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))
473
679
        
474
680
        try:
475
681
            session.handshake()
485
691
            session.bye()
486
692
            return
487
693
        logger.debug(u"Fingerprint: %s", fpr)
488
 
        client = None
489
694
        for c in self.server.clients:
490
695
            if c.fingerprint == fpr:
491
696
                client = c
492
697
                break
493
 
        if not client:
 
698
        else:
494
699
            logger.warning(u"Client not found for fingerprint: %s",
495
700
                           fpr)
496
701
            session.bye()
503
708
                           vars(client))
504
709
            session.bye()
505
710
            return
 
711
        ## This won't work here, since we're in a fork.
 
712
        # client.bump_timeout()
506
713
        sent_size = 0
507
714
        while sent_size < len(client.secret):
508
715
            sent = session.send(client.secret[sent_size:])
513
720
        session.bye()
514
721
 
515
722
 
516
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
723
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
724
                     SocketServer.TCPServer, object):
517
725
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
518
726
    Attributes:
519
727
        settings:       Server settings
529
737
            self.clients = kwargs["clients"]
530
738
            del kwargs["clients"]
531
739
        self.enabled = False
532
 
        return super(type(self), self).__init__(*args, **kwargs)
 
740
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
533
741
    def server_bind(self):
534
742
        """This overrides the normal server_bind() function
535
743
        to bind to an interface if one was specified, and also NOT to
564
772
#                                            if_nametoindex
565
773
#                                            (self.settings
566
774
#                                             ["interface"]))
567
 
            return super(type(self), self).server_bind()
 
775
            return super(IPv6_TCPServer, self).server_bind()
568
776
    def server_activate(self):
569
777
        if self.enabled:
570
 
            return super(type(self), self).server_activate()
 
778
            return super(IPv6_TCPServer, self).server_activate()
571
779
    def enable(self):
572
780
        self.enabled = True
573
781
 
591
799
    timevalue = datetime.timedelta(0)
592
800
    for s in interval.split():
593
801
        try:
594
 
            suffix=unicode(s[-1])
595
 
            value=int(s[:-1])
 
802
            suffix = unicode(s[-1])
 
803
            value = int(s[:-1])
596
804
            if suffix == u"d":
597
805
                delta = datetime.timedelta(value)
598
806
            elif suffix == u"s":
632
840
    elif state == avahi.ENTRY_GROUP_FAILURE:
633
841
        logger.critical(u"Avahi: Error in group state changed %s",
634
842
                        unicode(error))
635
 
        raise AvahiGroupError("State changed: %s", str(error))
 
843
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
636
844
 
637
845
def if_nametoindex(interface):
638
846
    """Call the C function if_nametoindex(), or equivalent"""
639
847
    global if_nametoindex
640
848
    try:
641
 
        if "ctypes.util" not in sys.modules:
642
 
            import ctypes.util
643
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
644
 
            (ctypes.util.find_library("c")).if_nametoindex
 
849
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
850
                          (ctypes.util.find_library("c"))
 
851
                          .if_nametoindex)
645
852
    except (OSError, AttributeError):
646
853
        if "struct" not in sys.modules:
647
854
            import struct
650
857
        def if_nametoindex(interface):
651
858
            "Get an interface index the hard way, i.e. using fcntl()"
652
859
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
653
 
            s = socket.socket()
654
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
655
 
                                struct.pack("16s16x", interface))
656
 
            s.close()
 
860
            with closing(socket.socket()) as s:
 
861
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
862
                                    struct.pack("16s16x", interface))
657
863
            interface_index = struct.unpack("I", ifreq[16:20])[0]
658
864
            return interface_index
659
865
    return if_nametoindex(interface)
683
889
 
684
890
 
685
891
def main():
686
 
    global main_loop_started
687
 
    main_loop_started = False
688
 
    
689
 
    parser = OptionParser(version = "%%prog %s" % version)
 
892
    parser = optparse.OptionParser(version = "%%prog %s" % version)
690
893
    parser.add_option("-i", "--interface", type="string",
691
894
                      metavar="IF", help="Bind to interface IF")
692
895
    parser.add_option("-a", "--address", type="string",
693
896
                      help="Address to listen for requests on")
694
897
    parser.add_option("-p", "--port", type="int",
695
898
                      help="Port number to receive requests on")
696
 
    parser.add_option("--check", action="store_true", default=False,
 
899
    parser.add_option("--check", action="store_true",
697
900
                      help="Run self-test")
698
901
    parser.add_option("--debug", action="store_true",
699
902
                      help="Debug mode; run in foreground and log to"
706
909
                      default="/etc/mandos", metavar="DIR",
707
910
                      help="Directory to search for configuration"
708
911
                      " files")
709
 
    (options, args) = parser.parse_args()
 
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
    options = parser.parse_args()[0]
710
917
    
711
918
    if options.check:
712
919
        import doctest
721
928
                        "priority":
722
929
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
723
930
                        "servicename": "Mandos",
 
931
                        "use_dbus": "True",
724
932
                        }
725
933
    
726
934
    # Parse config file for server-global settings
729
937
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
730
938
    # Convert the SafeConfigParser object to a dict
731
939
    server_settings = server_config.defaults()
732
 
    # Use getboolean on the boolean config option
733
 
    server_settings["debug"] = server_config.getboolean\
734
 
                               ("DEFAULT", "debug")
 
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"))
735
945
    del server_config
736
946
    
737
947
    # Override the settings from the config file with command line
738
948
    # options, if set.
739
949
    for option in ("interface", "address", "port", "debug",
740
 
                   "priority", "servicename", "configdir"):
 
950
                   "priority", "servicename", "configdir",
 
951
                   "use_dbus"):
741
952
        value = getattr(options, option)
742
953
        if value is not None:
743
954
            server_settings[option] = value
744
955
    del options
745
956
    # Now we have our good server settings in "server_settings"
746
957
    
 
958
    # For convenience
747
959
    debug = server_settings["debug"]
 
960
    use_dbus = server_settings["use_dbus"]
748
961
    
749
962
    if not debug:
750
963
        syslogger.setLevel(logging.WARNING)
751
964
        console.setLevel(logging.WARNING)
752
965
    
753
966
    if server_settings["servicename"] != "Mandos":
754
 
        syslogger.setFormatter(logging.Formatter\
 
967
        syslogger.setFormatter(logging.Formatter
755
968
                               ('Mandos (%s): %%(levelname)s:'
756
969
                                ' %%(message)s'
757
970
                                % server_settings["servicename"]))
759
972
    # Parse config file with clients
760
973
    client_defaults = { "timeout": "1h",
761
974
                        "interval": "5m",
762
 
                        "checker": "fping -q -- %(host)s",
 
975
                        "checker": "fping -q -- %%(host)s",
763
976
                        "host": "",
764
977
                        }
765
978
    client_config = ConfigParser.SafeConfigParser(client_defaults)
769
982
    clients = Set()
770
983
    tcp_server = IPv6_TCPServer((server_settings["address"],
771
984
                                 server_settings["port"]),
772
 
                                tcp_handler,
 
985
                                TCP_handler,
773
986
                                settings=server_settings,
774
987
                                clients=clients)
775
988
    pidfilename = "/var/run/mandos.pid"
778
991
    except IOError, error:
779
992
        logger.error("Could not open file %r", pidfilename)
780
993
    
781
 
    uid = 65534
782
 
    gid = 65534
783
 
    try:
784
 
        uid = pwd.getpwnam("mandos").pw_uid
785
 
    except KeyError:
786
 
        try:
787
 
            uid = pwd.getpwnam("nobody").pw_uid
788
 
        except KeyError:
789
 
            pass
790
 
    try:
791
 
        gid = pwd.getpwnam("mandos").pw_gid
792
 
    except KeyError:
793
 
        try:
794
 
            gid = pwd.getpwnam("nogroup").pw_gid
795
 
        except KeyError:
796
 
            pass
 
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
797
1008
    try:
798
1009
        os.setuid(uid)
799
1010
        os.setgid(gid)
803
1014
    
804
1015
    global service
805
1016
    service = AvahiService(name = server_settings["servicename"],
806
 
                           type = "_mandos._tcp", );
 
1017
                           servicetype = "_mandos._tcp", )
807
1018
    if server_settings["interface"]:
808
 
        service.interface = if_nametoindex\
809
 
                            (server_settings["interface"])
 
1019
        service.interface = (if_nametoindex
 
1020
                             (server_settings["interface"]))
810
1021
    
811
1022
    global main_loop
812
1023
    global bus
819
1030
                                           avahi.DBUS_PATH_SERVER),
820
1031
                            avahi.DBUS_INTERFACE_SERVER)
821
1032
    # End of Avahi example code
822
 
    
823
 
    def remove_from_clients(client):
824
 
        clients.remove(client)
825
 
        if not clients:
826
 
            logger.critical(u"No clients left, exiting")
827
 
            sys.exit()
 
1033
    if use_dbus:
 
1034
        bus_name = dbus.service.BusName(u"org.mandos-system.Mandos",
 
1035
                                        bus)
828
1036
    
829
1037
    clients.update(Set(Client(name = section,
830
 
                              stop_hook = remove_from_clients,
831
1038
                              config
832
 
                              = dict(client_config.items(section)))
 
1039
                              = dict(client_config.items(section)),
 
1040
                              use_dbus = use_dbus)
833
1041
                       for section in client_config.sections()))
834
1042
    if not clients:
835
 
        logger.critical(u"No clients defined")
836
 
        sys.exit(1)
 
1043
        logger.warning(u"No clients defined")
837
1044
    
838
1045
    if debug:
839
1046
        # Redirect stdin so all checkers get /dev/null
852
1059
        pidfile.write(str(pid) + "\n")
853
1060
        pidfile.close()
854
1061
        del pidfile
855
 
    except IOError, err:
 
1062
    except IOError:
856
1063
        logger.error(u"Could not write to file %r with PID %d",
857
1064
                     pidfilename, pid)
858
1065
    except NameError:
871
1078
        
872
1079
        while clients:
873
1080
            client = clients.pop()
874
 
            client.stop_hook = None
875
 
            client.stop()
 
1081
            client.disable_hook = None
 
1082
            client.disable()
876
1083
    
877
1084
    atexit.register(cleanup)
878
1085
    
881
1088
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
882
1089
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
883
1090
    
 
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
    
884
1140
    for client in clients:
885
 
        client.start()
 
1141
        if use_dbus:
 
1142
            # Emit D-Bus signal
 
1143
            mandos_server.ClientAdded(client.dbus_object_path,
 
1144
                                      client.GetAllProperties())
 
1145
        client.enable()
886
1146
    
887
1147
    tcp_server.enable()
888
1148
    tcp_server.server_activate()
906
1166
        
907
1167
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
908
1168
                             lambda *args, **kwargs:
909
 
                             tcp_server.handle_request\
910
 
                             (*args[2:], **kwargs) or True)
 
1169
                             (tcp_server.handle_request
 
1170
                              (*args[2:], **kwargs) or True))
911
1171
        
912
1172
        logger.debug(u"Starting main loop")
913
 
        main_loop_started = True
914
1173
        main_loop.run()
915
1174
    except AvahiError, error:
916
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
1175
        logger.critical(u"AvahiError: %s", error)
917
1176
        sys.exit(1)
918
1177
    except KeyboardInterrupt:
919
1178
        if debug: