/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2009-02-07 04:50:39 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
                                   "/scripts/local-top/mandos" to
                                   "/scripts/init-premount/mandos".
  (uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".

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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 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
 
from optparse import OptionParser
 
38
import optparse
38
39
import datetime
39
40
import errno
40
41
import gnutls.crypto
55
56
import logging
56
57
import logging.handlers
57
58
import pwd
 
59
from contextlib import closing
58
60
 
59
61
import dbus
 
62
import dbus.service
60
63
import gobject
61
64
import avahi
62
65
from dbus.mainloop.glib import DBusGMainLoop
63
66
import ctypes
64
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 [%(process)d]: %(levelname)s:'
 
77
                        ' %(message)s'))
74
78
logger.addHandler(syslogger)
75
79
 
76
80
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
 
                                       ' %(message)s'))
 
81
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
 
82
                                       ' %(levelname)s: %(message)s'))
79
83
logger.addHandler(console)
80
84
 
81
85
class AvahiError(Exception):
82
 
    def __init__(self, value):
 
86
    def __init__(self, value, *args, **kwargs):
83
87
        self.value = value
84
 
        super(AvahiError, self).__init__()
85
 
    def __str__(self):
86
 
        return repr(self.value)
 
88
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
89
    def __unicode__(self):
 
90
        return unicode(repr(self.value))
87
91
 
88
92
class AvahiServiceError(AvahiError):
89
93
    pass
109
113
                  a sensible number of times
110
114
    """
111
115
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
112
 
                 servicetype = None, port = None, TXT = None, domain = "",
113
 
                 host = "", max_renames = 32768):
 
116
                 servicetype = None, port = None, TXT = None,
 
117
                 domain = "", host = "", max_renames = 32768):
114
118
        self.interface = interface
115
119
        self.name = name
116
120
        self.type = servicetype
117
121
        self.port = port
118
 
        if TXT is None:
119
 
            self.TXT = []
120
 
        else:
121
 
            self.TXT = TXT
 
122
        self.TXT = TXT if TXT is not None else []
122
123
        self.domain = domain
123
124
        self.host = host
124
125
        self.rename_count = 0
129
130
            logger.critical(u"No suitable Zeroconf service name found"
130
131
                            u" after %i retries, exiting.",
131
132
                            self.rename_count)
132
 
            raise AvahiServiceError("Too many renames")
 
133
            raise AvahiServiceError(u"Too many renames")
133
134
        self.name = server.GetAlternativeServiceName(self.name)
134
135
        logger.info(u"Changing Zeroconf service name to %r ...",
135
136
                    str(self.name))
136
 
        syslogger.setFormatter(logging.Formatter\
 
137
        syslogger.setFormatter(logging.Formatter
137
138
                               ('Mandos (%s): %%(levelname)s:'
138
 
                               ' %%(message)s' % self.name))
 
139
                                ' %%(message)s' % self.name))
139
140
        self.remove()
140
141
        self.add()
141
142
        self.rename_count += 1
147
148
        """Derived from the Avahi example code"""
148
149
        global group
149
150
        if group is None:
150
 
            group = dbus.Interface\
151
 
                    (bus.get_object(avahi.DBUS_NAME,
 
151
            group = dbus.Interface(bus.get_object
 
152
                                   (avahi.DBUS_NAME,
152
153
                                    server.EntryGroupNew()),
153
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
154
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
155
            group.connect_to_signal('StateChanged',
155
156
                                    entry_group_state_changed)
156
157
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
170
171
# End of Avahi example code
171
172
 
172
173
 
173
 
class Client(object):
 
174
def _datetime_to_dbus(dt, variant_level=0):
 
175
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
176
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
177
 
 
178
 
 
179
class Client(dbus.service.Object):
174
180
    """A representation of a client host served by this server.
175
181
    Attributes:
176
 
    name:      string; from the config file, used in log messages
 
182
    name:       string; from the config file, used in log messages and
 
183
                        D-Bus identifiers
177
184
    fingerprint: string (40 or 32 hexadecimal digits); used to
178
185
                 uniquely identify the client
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.
 
186
    secret:     bytestring; sent verbatim (over TLS) to client
 
187
    host:       string; available for use by the checker command
 
188
    created:    datetime.datetime(); (UTC) object creation
 
189
    last_enabled: datetime.datetime(); (UTC)
 
190
    enabled:    bool()
 
191
    last_checked_ok: datetime.datetime(); (UTC) or None
 
192
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
193
                                      until this client is invalid
 
194
    interval:   datetime.timedelta(); How often to start a new checker
 
195
    disable_hook:  If set, called by disable() as disable_hook(self)
 
196
    checker:    subprocess.Popen(); a running checker process used
 
197
                                    to see if the client lives.
 
198
                                    'None' if no process is running.
190
199
    checker_initiator_tag: a gobject event source tag, or None
191
 
    stop_initiator_tag:    - '' -
 
200
    disable_initiator_tag:    - '' -
192
201
    checker_callback_tag:  - '' -
193
202
    checker_command: string; External command which is run to check if
194
203
                     client lives.  %() expansions are done at
195
204
                     runtime with vars(self) as dict, so that for
196
205
                     instance %(name)s can be used in the command.
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
    use_dbus: bool(); Whether to provide D-Bus interface and signals
 
207
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
202
208
    """
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):
 
209
    def timeout_milliseconds(self):
 
210
        "Return the 'timeout' attribute in milliseconds"
 
211
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
 
212
                + (self.timeout.seconds * 1000)
 
213
                + (self.timeout.microseconds // 1000))
 
214
    
 
215
    def interval_milliseconds(self):
 
216
        "Return the 'interval' attribute in milliseconds"
 
217
        return ((self.interval.days * 24 * 60 * 60 * 1000)
 
218
                + (self.interval.seconds * 1000)
 
219
                + (self.interval.microseconds // 1000))
 
220
    
 
221
    def __init__(self, name = None, disable_hook=None, config=None,
 
222
                 use_dbus=True):
227
223
        """Note: the 'checker' key in 'config' sets the
228
224
        'checker_command' attribute and *not* the 'checker'
229
225
        attribute."""
 
226
        self.name = name
230
227
        if config is None:
231
228
            config = {}
232
 
        self.name = name
233
229
        logger.debug(u"Creating client %r", self.name)
 
230
        self.use_dbus = False   # During __init__
234
231
        # Uppercase and remove spaces from fingerprint for later
235
232
        # comparison purposes with return value from the fingerprint()
236
233
        # function
237
 
        self.fingerprint = config["fingerprint"].upper()\
238
 
                           .replace(u" ", u"")
 
234
        self.fingerprint = (config["fingerprint"].upper()
 
235
                            .replace(u" ", u""))
239
236
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
240
237
        if "secret" in config:
241
238
            self.secret = config["secret"].decode(u"base64")
242
239
        elif "secfile" in config:
243
 
            secfile = open(os.path.expanduser(os.path.expandvars
244
 
                                              (config["secfile"])))
245
 
            self.secret = secfile.read()
246
 
            secfile.close()
 
240
            with closing(open(os.path.expanduser
 
241
                              (os.path.expandvars
 
242
                               (config["secfile"])))) as secfile:
 
243
                self.secret = secfile.read()
247
244
        else:
248
245
            raise TypeError(u"No secret or secfile for client %s"
249
246
                            % self.name)
250
247
        self.host = config.get("host", "")
251
 
        self.created = datetime.datetime.now()
 
248
        self.created = datetime.datetime.utcnow()
 
249
        self.enabled = False
 
250
        self.last_enabled = None
252
251
        self.last_checked_ok = None
253
252
        self.timeout = string_to_delta(config["timeout"])
254
253
        self.interval = string_to_delta(config["interval"])
255
 
        self.stop_hook = stop_hook
 
254
        self.disable_hook = disable_hook
256
255
        self.checker = None
257
256
        self.checker_initiator_tag = None
258
 
        self.stop_initiator_tag = None
 
257
        self.disable_initiator_tag = None
259
258
        self.checker_callback_tag = None
260
 
        self.check_command = config["checker"]
261
 
    def start(self):
 
259
        self.checker_command = config["checker"]
 
260
        self.last_connect = None
 
261
        # Only now, when this client is initialized, can it show up on
 
262
        # the D-Bus
 
263
        self.use_dbus = use_dbus
 
264
        if self.use_dbus:
 
265
            self.dbus_object_path = (dbus.ObjectPath
 
266
                                     ("/clients/"
 
267
                                      + self.name.replace(".", "_")))
 
268
            dbus.service.Object.__init__(self, bus,
 
269
                                         self.dbus_object_path)
 
270
    
 
271
    def enable(self):
262
272
        """Start this client's checker and timeout hooks"""
 
273
        self.last_enabled = datetime.datetime.utcnow()
263
274
        # Schedule a new checker to be started an 'interval' from now,
264
275
        # and every interval from then on.
265
 
        self.checker_initiator_tag = gobject.timeout_add\
266
 
                                     (self._interval_milliseconds,
267
 
                                      self.start_checker)
 
276
        self.checker_initiator_tag = (gobject.timeout_add
 
277
                                      (self.interval_milliseconds(),
 
278
                                       self.start_checker))
268
279
        # Also start a new checker *right now*.
269
280
        self.start_checker()
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:
 
281
        # Schedule a disable() when 'timeout' has passed
 
282
        self.disable_initiator_tag = (gobject.timeout_add
 
283
                                   (self.timeout_milliseconds(),
 
284
                                    self.disable))
 
285
        self.enabled = True
 
286
        if self.use_dbus:
 
287
            # Emit D-Bus signals
 
288
            self.PropertyChanged(dbus.String(u"enabled"),
 
289
                                 dbus.Boolean(True, variant_level=1))
 
290
            self.PropertyChanged(dbus.String(u"last_enabled"),
 
291
                                 (_datetime_to_dbus(self.last_enabled,
 
292
                                                    variant_level=1)))
 
293
    
 
294
    def disable(self):
 
295
        """Disable this client."""
 
296
        if not getattr(self, "enabled", False):
283
297
            return False
284
 
        if getattr(self, "stop_initiator_tag", False):
285
 
            gobject.source_remove(self.stop_initiator_tag)
286
 
            self.stop_initiator_tag = None
 
298
        logger.info(u"Disabling client %s", self.name)
 
299
        if getattr(self, "disable_initiator_tag", False):
 
300
            gobject.source_remove(self.disable_initiator_tag)
 
301
            self.disable_initiator_tag = None
287
302
        if getattr(self, "checker_initiator_tag", False):
288
303
            gobject.source_remove(self.checker_initiator_tag)
289
304
            self.checker_initiator_tag = None
290
305
        self.stop_checker()
291
 
        if self.stop_hook:
292
 
            self.stop_hook(self)
 
306
        if self.disable_hook:
 
307
            self.disable_hook(self)
 
308
        self.enabled = False
 
309
        if self.use_dbus:
 
310
            # Emit D-Bus signal
 
311
            self.PropertyChanged(dbus.String(u"enabled"),
 
312
                                 dbus.Boolean(False, variant_level=1))
293
313
        # Do not run this again if called by a gobject.timeout_add
294
314
        return False
 
315
    
295
316
    def __del__(self):
296
 
        self.stop_hook = None
297
 
        self.stop()
298
 
    def checker_callback(self, pid, condition):
 
317
        self.disable_hook = None
 
318
        self.disable()
 
319
    
 
320
    def checker_callback(self, pid, condition, command):
299
321
        """The checker has completed, so take appropriate actions."""
300
 
        now = datetime.datetime.now()
301
322
        self.checker_callback_tag = None
302
323
        self.checker = None
303
 
        if os.WIFEXITED(condition) \
304
 
               and (os.WEXITSTATUS(condition) == 0):
305
 
            logger.info(u"Checker for %(name)s succeeded",
306
 
                        vars(self))
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)
312
 
        elif not os.WIFEXITED(condition):
 
324
        if self.use_dbus:
 
325
            # Emit D-Bus signal
 
326
            self.PropertyChanged(dbus.String(u"checker_running"),
 
327
                                 dbus.Boolean(False, variant_level=1))
 
328
        if os.WIFEXITED(condition):
 
329
            exitstatus = os.WEXITSTATUS(condition)
 
330
            if exitstatus == 0:
 
331
                logger.info(u"Checker for %(name)s succeeded",
 
332
                            vars(self))
 
333
                self.checked_ok()
 
334
            else:
 
335
                logger.info(u"Checker for %(name)s failed",
 
336
                            vars(self))
 
337
            if self.use_dbus:
 
338
                # Emit D-Bus signal
 
339
                self.CheckerCompleted(dbus.Int16(exitstatus),
 
340
                                      dbus.Int64(condition),
 
341
                                      dbus.String(command))
 
342
        else:
313
343
            logger.warning(u"Checker for %(name)s crashed?",
314
344
                           vars(self))
315
 
        else:
316
 
            logger.info(u"Checker for %(name)s failed",
317
 
                        vars(self))
 
345
            if self.use_dbus:
 
346
                # Emit D-Bus signal
 
347
                self.CheckerCompleted(dbus.Int16(-1),
 
348
                                      dbus.Int64(condition),
 
349
                                      dbus.String(command))
 
350
    
 
351
    def checked_ok(self):
 
352
        """Bump up the timeout for this client.
 
353
        This should only be called when the client has been seen,
 
354
        alive and well.
 
355
        """
 
356
        self.last_checked_ok = datetime.datetime.utcnow()
 
357
        gobject.source_remove(self.disable_initiator_tag)
 
358
        self.disable_initiator_tag = (gobject.timeout_add
 
359
                                      (self.timeout_milliseconds(),
 
360
                                       self.disable))
 
361
        if self.use_dbus:
 
362
            # Emit D-Bus signal
 
363
            self.PropertyChanged(
 
364
                dbus.String(u"last_checked_ok"),
 
365
                (_datetime_to_dbus(self.last_checked_ok,
 
366
                                   variant_level=1)))
 
367
    
318
368
    def start_checker(self):
319
369
        """Start a new checker subprocess if one is not running.
320
370
        If a checker already exists, leave it running and do
329
379
        # is as it should be.
330
380
        if self.checker is None:
331
381
            try:
332
 
                # In case check_command has exactly one % operator
333
 
                command = self.check_command % self.host
 
382
                # In case checker_command has exactly one % operator
 
383
                command = self.checker_command % self.host
334
384
            except TypeError:
335
385
                # Escape attributes for the shell
336
386
                escaped_attrs = dict((key, re.escape(str(val)))
337
387
                                     for key, val in
338
388
                                     vars(self).iteritems())
339
389
                try:
340
 
                    command = self.check_command % escaped_attrs
 
390
                    command = self.checker_command % escaped_attrs
341
391
                except TypeError, error:
342
392
                    logger.error(u'Could not format string "%s":'
343
 
                                 u' %s', self.check_command, error)
 
393
                                 u' %s', self.checker_command, error)
344
394
                    return True # Try again later
345
395
            try:
346
396
                logger.info(u"Starting checker %r for %s",
352
402
                self.checker = subprocess.Popen(command,
353
403
                                                close_fds=True,
354
404
                                                shell=True, cwd="/")
355
 
                self.checker_callback_tag = gobject.child_watch_add\
356
 
                                            (self.checker.pid,
357
 
                                             self.checker_callback)
 
405
                if self.use_dbus:
 
406
                    # Emit D-Bus signal
 
407
                    self.CheckerStarted(command)
 
408
                    self.PropertyChanged(
 
409
                        dbus.String("checker_running"),
 
410
                        dbus.Boolean(True, variant_level=1))
 
411
                self.checker_callback_tag = (gobject.child_watch_add
 
412
                                             (self.checker.pid,
 
413
                                              self.checker_callback,
 
414
                                              data=command))
358
415
            except OSError, error:
359
416
                logger.error(u"Failed to start subprocess: %s",
360
417
                             error)
361
418
        # Re-run this periodically if run by gobject.timeout_add
362
419
        return True
 
420
    
363
421
    def stop_checker(self):
364
422
        """Force the checker process, if any, to stop."""
365
423
        if self.checker_callback_tag:
377
435
            if error.errno != errno.ESRCH: # No such process
378
436
                raise
379
437
        self.checker = None
 
438
        if self.use_dbus:
 
439
            self.PropertyChanged(dbus.String(u"checker_running"),
 
440
                                 dbus.Boolean(False, variant_level=1))
 
441
    
380
442
    def still_valid(self):
381
443
        """Has the timeout not yet passed for this client?"""
382
 
        now = datetime.datetime.now()
 
444
        if not getattr(self, "enabled", False):
 
445
            return False
 
446
        now = datetime.datetime.utcnow()
383
447
        if self.last_checked_ok is None:
384
448
            return now < (self.created + self.timeout)
385
449
        else:
386
450
            return now < (self.last_checked_ok + self.timeout)
 
451
    
 
452
    ## D-Bus methods & signals
 
453
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
454
    
 
455
    # CheckedOK - method
 
456
    CheckedOK = dbus.service.method(_interface)(checked_ok)
 
457
    CheckedOK.__name__ = "CheckedOK"
 
458
    
 
459
    # CheckerCompleted - signal
 
460
    @dbus.service.signal(_interface, signature="nxs")
 
461
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
462
        "D-Bus signal"
 
463
        pass
 
464
    
 
465
    # CheckerStarted - signal
 
466
    @dbus.service.signal(_interface, signature="s")
 
467
    def CheckerStarted(self, command):
 
468
        "D-Bus signal"
 
469
        pass
 
470
    
 
471
    # GetAllProperties - method
 
472
    @dbus.service.method(_interface, out_signature="a{sv}")
 
473
    def GetAllProperties(self):
 
474
        "D-Bus method"
 
475
        return dbus.Dictionary({
 
476
                dbus.String("name"):
 
477
                    dbus.String(self.name, variant_level=1),
 
478
                dbus.String("fingerprint"):
 
479
                    dbus.String(self.fingerprint, variant_level=1),
 
480
                dbus.String("host"):
 
481
                    dbus.String(self.host, variant_level=1),
 
482
                dbus.String("created"):
 
483
                    _datetime_to_dbus(self.created, variant_level=1),
 
484
                dbus.String("last_enabled"):
 
485
                    (_datetime_to_dbus(self.last_enabled,
 
486
                                       variant_level=1)
 
487
                     if self.last_enabled is not None
 
488
                     else dbus.Boolean(False, variant_level=1)),
 
489
                dbus.String("enabled"):
 
490
                    dbus.Boolean(self.enabled, variant_level=1),
 
491
                dbus.String("last_checked_ok"):
 
492
                    (_datetime_to_dbus(self.last_checked_ok,
 
493
                                       variant_level=1)
 
494
                     if self.last_checked_ok is not None
 
495
                     else dbus.Boolean (False, variant_level=1)),
 
496
                dbus.String("timeout"):
 
497
                    dbus.UInt64(self.timeout_milliseconds(),
 
498
                                variant_level=1),
 
499
                dbus.String("interval"):
 
500
                    dbus.UInt64(self.interval_milliseconds(),
 
501
                                variant_level=1),
 
502
                dbus.String("checker"):
 
503
                    dbus.String(self.checker_command,
 
504
                                variant_level=1),
 
505
                dbus.String("checker_running"):
 
506
                    dbus.Boolean(self.checker is not None,
 
507
                                 variant_level=1),
 
508
                dbus.String("object_path"):
 
509
                    dbus.ObjectPath(self.dbus_object_path,
 
510
                                    variant_level=1)
 
511
                }, signature="sv")
 
512
    
 
513
    # IsStillValid - method
 
514
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
 
515
                    (still_valid))
 
516
    IsStillValid.__name__ = "IsStillValid"
 
517
    
 
518
    # PropertyChanged - signal
 
519
    @dbus.service.signal(_interface, signature="sv")
 
520
    def PropertyChanged(self, property, value):
 
521
        "D-Bus signal"
 
522
        pass
 
523
    
 
524
    # SetChecker - method
 
525
    @dbus.service.method(_interface, in_signature="s")
 
526
    def SetChecker(self, checker):
 
527
        "D-Bus setter method"
 
528
        self.checker_command = checker
 
529
        # Emit D-Bus signal
 
530
        self.PropertyChanged(dbus.String(u"checker"),
 
531
                             dbus.String(self.checker_command,
 
532
                                         variant_level=1))
 
533
    
 
534
    # SetHost - method
 
535
    @dbus.service.method(_interface, in_signature="s")
 
536
    def SetHost(self, host):
 
537
        "D-Bus setter method"
 
538
        self.host = host
 
539
        # Emit D-Bus signal
 
540
        self.PropertyChanged(dbus.String(u"host"),
 
541
                             dbus.String(self.host, variant_level=1))
 
542
    
 
543
    # SetInterval - method
 
544
    @dbus.service.method(_interface, in_signature="t")
 
545
    def SetInterval(self, milliseconds):
 
546
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
 
547
        # Emit D-Bus signal
 
548
        self.PropertyChanged(dbus.String(u"interval"),
 
549
                             (dbus.UInt64(self.interval_milliseconds(),
 
550
                                          variant_level=1)))
 
551
    
 
552
    # SetSecret - method
 
553
    @dbus.service.method(_interface, in_signature="ay",
 
554
                         byte_arrays=True)
 
555
    def SetSecret(self, secret):
 
556
        "D-Bus setter method"
 
557
        self.secret = str(secret)
 
558
    
 
559
    # SetTimeout - method
 
560
    @dbus.service.method(_interface, in_signature="t")
 
561
    def SetTimeout(self, milliseconds):
 
562
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
563
        # Emit D-Bus signal
 
564
        self.PropertyChanged(dbus.String(u"timeout"),
 
565
                             (dbus.UInt64(self.timeout_milliseconds(),
 
566
                                          variant_level=1)))
 
567
    
 
568
    # Enable - method
 
569
    Enable = dbus.service.method(_interface)(enable)
 
570
    Enable.__name__ = "Enable"
 
571
    
 
572
    # StartChecker - method
 
573
    @dbus.service.method(_interface)
 
574
    def StartChecker(self):
 
575
        "D-Bus method"
 
576
        self.start_checker()
 
577
    
 
578
    # Disable - method
 
579
    @dbus.service.method(_interface)
 
580
    def Disable(self):
 
581
        "D-Bus method"
 
582
        self.disable()
 
583
    
 
584
    # StopChecker - method
 
585
    StopChecker = dbus.service.method(_interface)(stop_checker)
 
586
    StopChecker.__name__ = "StopChecker"
 
587
    
 
588
    del _interface
387
589
 
388
590
 
389
591
def peer_certificate(session):
390
592
    "Return the peer's OpenPGP certificate as a bytestring"
391
593
    # If not an OpenPGP certificate...
392
 
    if gnutls.library.functions.gnutls_certificate_type_get\
393
 
            (session._c_object) \
394
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
594
    if (gnutls.library.functions
 
595
        .gnutls_certificate_type_get(session._c_object)
 
596
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
395
597
        # ...do the normal thing
396
598
        return session.peer_certificate
397
 
    list_size = ctypes.c_uint()
398
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
399
 
        (session._c_object, ctypes.byref(list_size))
 
599
    list_size = ctypes.c_uint(1)
 
600
    cert_list = (gnutls.library.functions
 
601
                 .gnutls_certificate_get_peers
 
602
                 (session._c_object, ctypes.byref(list_size)))
 
603
    if not bool(cert_list) and list_size.value != 0:
 
604
        raise gnutls.errors.GNUTLSError("error getting peer"
 
605
                                        " certificate")
400
606
    if list_size.value == 0:
401
607
        return None
402
608
    cert = cert_list[0]
406
612
def fingerprint(openpgp):
407
613
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
408
614
    # New GnuTLS "datum" with the OpenPGP public key
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)))
 
615
    datum = (gnutls.library.types
 
616
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
617
                                         ctypes.POINTER
 
618
                                         (ctypes.c_ubyte)),
 
619
                             ctypes.c_uint(len(openpgp))))
413
620
    # New empty GnuTLS certificate
414
621
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
415
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
416
 
        (ctypes.byref(crt))
 
622
    (gnutls.library.functions
 
623
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
417
624
    # Import the OpenPGP public key into the certificate
418
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
419
 
                    (crt, ctypes.byref(datum),
420
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
625
    (gnutls.library.functions
 
626
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
627
                                gnutls.library.constants
 
628
                                .GNUTLS_OPENPGP_FMT_RAW))
421
629
    # Verify the self signature in the key
422
630
    crtverify = ctypes.c_uint()
423
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
424
 
        (crt, 0, ctypes.byref(crtverify))
 
631
    (gnutls.library.functions
 
632
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
425
633
    if crtverify.value != 0:
426
634
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
427
635
        raise gnutls.errors.CertificateSecurityError("Verify failed")
429
637
    buf = ctypes.create_string_buffer(20)
430
638
    buf_len = ctypes.c_size_t()
431
639
    # Get the fingerprint from the certificate into the buffer
432
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
433
 
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
 
640
    (gnutls.library.functions
 
641
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
642
                                         ctypes.byref(buf_len)))
434
643
    # Deinit the certificate
435
644
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
436
645
    # Convert the buffer to a Python bytestring
447
656
    
448
657
    def handle(self):
449
658
        logger.info(u"TCP connection from: %s",
450
 
                     unicode(self.client_address))
451
 
        session = gnutls.connection.ClientSession\
452
 
                  (self.request, gnutls.connection.X509Credentials())
 
659
                    unicode(self.client_address))
 
660
        session = (gnutls.connection
 
661
                   .ClientSession(self.request,
 
662
                                  gnutls.connection
 
663
                                  .X509Credentials()))
453
664
        
454
665
        line = self.request.makefile().readline()
455
666
        logger.debug(u"Protocol version: %r", line)
466
677
        # using OpenPGP certificates.
467
678
        
468
679
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
469
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
470
 
        #                "+DHE-DSS"))
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)
 
680
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
681
        #                     "+DHE-DSS"))
 
682
        # Use a fallback default, since this MUST be set.
 
683
        priority = self.server.settings.get("priority", "NORMAL")
 
684
        (gnutls.library.functions
 
685
         .gnutls_priority_set_direct(session._c_object,
 
686
                                     priority, None))
477
687
        
478
688
        try:
479
689
            session.handshake()
482
692
            # Do not run session.bye() here: the session is not
483
693
            # established.  Just abandon the request.
484
694
            return
 
695
        logger.debug(u"Handshake succeeded")
485
696
        try:
486
697
            fpr = fingerprint(peer_certificate(session))
487
698
        except (TypeError, gnutls.errors.GNUTLSError), error:
489
700
            session.bye()
490
701
            return
491
702
        logger.debug(u"Fingerprint: %s", fpr)
492
 
        client = None
 
703
        
493
704
        for c in self.server.clients:
494
705
            if c.fingerprint == fpr:
495
706
                client = c
496
707
                break
497
 
        if not client:
 
708
        else:
498
709
            logger.warning(u"Client not found for fingerprint: %s",
499
710
                           fpr)
500
711
            session.bye()
507
718
                           vars(client))
508
719
            session.bye()
509
720
            return
 
721
        ## This won't work here, since we're in a fork.
 
722
        # client.checked_ok()
510
723
        sent_size = 0
511
724
        while sent_size < len(client.secret):
512
725
            sent = session.send(client.secret[sent_size:])
517
730
        session.bye()
518
731
 
519
732
 
520
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
733
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
734
                     SocketServer.TCPServer, object):
521
735
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
522
736
    Attributes:
523
737
        settings:       Server settings
551
765
                                 u" bind to interface %s",
552
766
                                 self.settings["interface"])
553
767
                else:
554
 
                    raise error
 
768
                    raise
555
769
        # Only bind(2) the socket if we really need to.
556
770
        if self.server_address[0] or self.server_address[1]:
557
771
            if not self.server_address[0]:
578
792
 
579
793
def string_to_delta(interval):
580
794
    """Parse a string and return a datetime.timedelta
581
 
 
 
795
    
582
796
    >>> string_to_delta('7d')
583
797
    datetime.timedelta(7)
584
798
    >>> string_to_delta('60s')
636
850
    elif state == avahi.ENTRY_GROUP_FAILURE:
637
851
        logger.critical(u"Avahi: Error in group state changed %s",
638
852
                        unicode(error))
639
 
        raise AvahiGroupError("State changed: %s", str(error))
 
853
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
640
854
 
641
855
def if_nametoindex(interface):
642
856
    """Call the C function if_nametoindex(), or equivalent"""
643
857
    global if_nametoindex
644
858
    try:
645
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
646
 
            (ctypes.util.find_library("c")).if_nametoindex
 
859
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
860
                          (ctypes.util.find_library("c"))
 
861
                          .if_nametoindex)
647
862
    except (OSError, AttributeError):
648
863
        if "struct" not in sys.modules:
649
864
            import struct
652
867
        def if_nametoindex(interface):
653
868
            "Get an interface index the hard way, i.e. using fcntl()"
654
869
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
655
 
            s = socket.socket()
656
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
657
 
                                struct.pack("16s16x", interface))
658
 
            s.close()
 
870
            with closing(socket.socket()) as s:
 
871
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
872
                                    struct.pack("16s16x", interface))
659
873
            interface_index = struct.unpack("I", ifreq[16:20])[0]
660
874
            return interface_index
661
875
    return if_nametoindex(interface)
685
899
 
686
900
 
687
901
def main():
688
 
    parser = OptionParser(version = "%%prog %s" % version)
 
902
    parser = optparse.OptionParser(version = "%%prog %s" % version)
689
903
    parser.add_option("-i", "--interface", type="string",
690
904
                      metavar="IF", help="Bind to interface IF")
691
905
    parser.add_option("-a", "--address", type="string",
692
906
                      help="Address to listen for requests on")
693
907
    parser.add_option("-p", "--port", type="int",
694
908
                      help="Port number to receive requests on")
695
 
    parser.add_option("--check", action="store_true", default=False,
 
909
    parser.add_option("--check", action="store_true",
696
910
                      help="Run self-test")
697
911
    parser.add_option("--debug", action="store_true",
698
912
                      help="Debug mode; run in foreground and log to"
705
919
                      default="/etc/mandos", metavar="DIR",
706
920
                      help="Directory to search for configuration"
707
921
                      " files")
 
922
    parser.add_option("--no-dbus", action="store_false",
 
923
                      dest="use_dbus",
 
924
                      help="Do not provide D-Bus system bus"
 
925
                      " interface")
708
926
    options = parser.parse_args()[0]
709
927
    
710
928
    if options.check:
720
938
                        "priority":
721
939
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
722
940
                        "servicename": "Mandos",
 
941
                        "use_dbus": "True",
723
942
                        }
724
943
    
725
944
    # Parse config file for server-global settings
728
947
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
729
948
    # Convert the SafeConfigParser object to a dict
730
949
    server_settings = server_config.defaults()
731
 
    # Use getboolean on the boolean config option
732
 
    server_settings["debug"] = server_config.getboolean\
733
 
                               ("DEFAULT", "debug")
 
950
    # Use the appropriate methods on the non-string config options
 
951
    server_settings["debug"] = server_config.getboolean("DEFAULT",
 
952
                                                        "debug")
 
953
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
 
954
                                                           "use_dbus")
 
955
    if server_settings["port"]:
 
956
        server_settings["port"] = server_config.getint("DEFAULT",
 
957
                                                       "port")
734
958
    del server_config
735
959
    
736
960
    # Override the settings from the config file with command line
737
961
    # options, if set.
738
962
    for option in ("interface", "address", "port", "debug",
739
 
                   "priority", "servicename", "configdir"):
 
963
                   "priority", "servicename", "configdir",
 
964
                   "use_dbus"):
740
965
        value = getattr(options, option)
741
966
        if value is not None:
742
967
            server_settings[option] = value
743
968
    del options
744
969
    # Now we have our good server settings in "server_settings"
745
970
    
 
971
    # For convenience
746
972
    debug = server_settings["debug"]
 
973
    use_dbus = server_settings["use_dbus"]
747
974
    
748
975
    if not debug:
749
976
        syslogger.setLevel(logging.WARNING)
750
977
        console.setLevel(logging.WARNING)
751
978
    
752
979
    if server_settings["servicename"] != "Mandos":
753
 
        syslogger.setFormatter(logging.Formatter\
 
980
        syslogger.setFormatter(logging.Formatter
754
981
                               ('Mandos (%s): %%(levelname)s:'
755
982
                                ' %%(message)s'
756
983
                                % server_settings["servicename"]))
758
985
    # Parse config file with clients
759
986
    client_defaults = { "timeout": "1h",
760
987
                        "interval": "5m",
761
 
                        "checker": "fping -q -- %(host)s",
 
988
                        "checker": "fping -q -- %%(host)s",
762
989
                        "host": "",
763
990
                        }
764
991
    client_config = ConfigParser.SafeConfigParser(client_defaults)
774
1001
    pidfilename = "/var/run/mandos.pid"
775
1002
    try:
776
1003
        pidfile = open(pidfilename, "w")
777
 
    except IOError, error:
 
1004
    except IOError:
778
1005
        logger.error("Could not open file %r", pidfilename)
779
1006
    
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
796
 
    try:
 
1007
    try:
 
1008
        uid = pwd.getpwnam("_mandos").pw_uid
 
1009
        gid = pwd.getpwnam("_mandos").pw_gid
 
1010
    except KeyError:
 
1011
        try:
 
1012
            uid = pwd.getpwnam("mandos").pw_uid
 
1013
            gid = pwd.getpwnam("mandos").pw_gid
 
1014
        except KeyError:
 
1015
            try:
 
1016
                uid = pwd.getpwnam("nobody").pw_uid
 
1017
                gid = pwd.getpwnam("nogroup").pw_gid
 
1018
            except KeyError:
 
1019
                uid = 65534
 
1020
                gid = 65534
 
1021
    try:
 
1022
        os.setgid(gid)
797
1023
        os.setuid(uid)
798
 
        os.setgid(gid)
799
1024
    except OSError, error:
800
1025
        if error[0] != errno.EPERM:
801
1026
            raise error
802
1027
    
 
1028
    # Enable all possible GnuTLS debugging
 
1029
    if debug:
 
1030
        # "Use a log level over 10 to enable all debugging options."
 
1031
        # - GnuTLS manual
 
1032
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1033
        
 
1034
        @gnutls.library.types.gnutls_log_func
 
1035
        def debug_gnutls(level, string):
 
1036
            logger.debug("GnuTLS: %s", string[:-1])
 
1037
        
 
1038
        (gnutls.library.functions
 
1039
         .gnutls_global_set_log_function(debug_gnutls))
 
1040
    
803
1041
    global service
804
1042
    service = AvahiService(name = server_settings["servicename"],
805
1043
                           servicetype = "_mandos._tcp", )
806
1044
    if server_settings["interface"]:
807
 
        service.interface = if_nametoindex\
808
 
                            (server_settings["interface"])
 
1045
        service.interface = (if_nametoindex
 
1046
                             (server_settings["interface"]))
809
1047
    
810
1048
    global main_loop
811
1049
    global bus
818
1056
                                           avahi.DBUS_PATH_SERVER),
819
1057
                            avahi.DBUS_INTERFACE_SERVER)
820
1058
    # End of Avahi example code
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()
 
1059
    if use_dbus:
 
1060
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
827
1061
    
828
1062
    clients.update(Set(Client(name = section,
829
 
                              stop_hook = remove_from_clients,
830
1063
                              config
831
 
                              = dict(client_config.items(section)))
 
1064
                              = dict(client_config.items(section)),
 
1065
                              use_dbus = use_dbus)
832
1066
                       for section in client_config.sections()))
833
1067
    if not clients:
834
 
        logger.critical(u"No clients defined")
835
 
        sys.exit(1)
 
1068
        logger.warning(u"No clients defined")
836
1069
    
837
1070
    if debug:
838
1071
        # Redirect stdin so all checkers get /dev/null
870
1103
        
871
1104
        while clients:
872
1105
            client = clients.pop()
873
 
            client.stop_hook = None
874
 
            client.stop()
 
1106
            client.disable_hook = None
 
1107
            client.disable()
875
1108
    
876
1109
    atexit.register(cleanup)
877
1110
    
880
1113
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
881
1114
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
882
1115
    
 
1116
    if use_dbus:
 
1117
        class MandosServer(dbus.service.Object):
 
1118
            """A D-Bus proxy object"""
 
1119
            def __init__(self):
 
1120
                dbus.service.Object.__init__(self, bus, "/")
 
1121
            _interface = u"se.bsnet.fukt.Mandos"
 
1122
            
 
1123
            @dbus.service.signal(_interface, signature="oa{sv}")
 
1124
            def ClientAdded(self, objpath, properties):
 
1125
                "D-Bus signal"
 
1126
                pass
 
1127
            
 
1128
            @dbus.service.signal(_interface, signature="os")
 
1129
            def ClientRemoved(self, objpath, name):
 
1130
                "D-Bus signal"
 
1131
                pass
 
1132
            
 
1133
            @dbus.service.method(_interface, out_signature="ao")
 
1134
            def GetAllClients(self):
 
1135
                "D-Bus method"
 
1136
                return dbus.Array(c.dbus_object_path for c in clients)
 
1137
            
 
1138
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
 
1139
            def GetAllClientsWithProperties(self):
 
1140
                "D-Bus method"
 
1141
                return dbus.Dictionary(
 
1142
                    ((c.dbus_object_path, c.GetAllProperties())
 
1143
                     for c in clients),
 
1144
                    signature="oa{sv}")
 
1145
            
 
1146
            @dbus.service.method(_interface, in_signature="o")
 
1147
            def RemoveClient(self, object_path):
 
1148
                "D-Bus method"
 
1149
                for c in clients:
 
1150
                    if c.dbus_object_path == object_path:
 
1151
                        clients.remove(c)
 
1152
                        # Don't signal anything except ClientRemoved
 
1153
                        c.use_dbus = False
 
1154
                        c.disable()
 
1155
                        # Emit D-Bus signal
 
1156
                        self.ClientRemoved(object_path, c.name)
 
1157
                        return
 
1158
                raise KeyError
 
1159
            
 
1160
            del _interface
 
1161
        
 
1162
        mandos_server = MandosServer()
 
1163
    
883
1164
    for client in clients:
884
 
        client.start()
 
1165
        if use_dbus:
 
1166
            # Emit D-Bus signal
 
1167
            mandos_server.ClientAdded(client.dbus_object_path,
 
1168
                                      client.GetAllProperties())
 
1169
        client.enable()
885
1170
    
886
1171
    tcp_server.enable()
887
1172
    tcp_server.server_activate()
905
1190
        
906
1191
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
907
1192
                             lambda *args, **kwargs:
908
 
                             tcp_server.handle_request\
909
 
                             (*args[2:], **kwargs) or True)
 
1193
                             (tcp_server.handle_request
 
1194
                              (*args[2:], **kwargs) or True))
910
1195
        
911
1196
        logger.debug(u"Starting main loop")
912
1197
        main_loop.run()
913
1198
    except AvahiError, error:
914
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
1199
        logger.critical(u"AvahiError: %s", error)
915
1200
        sys.exit(1)
916
1201
    except KeyboardInterrupt:
917
1202
        if debug:
918
 
            print
 
1203
            print >> sys.stderr
 
1204
        logger.debug("Server received KeyboardInterrupt")
 
1205
    logger.debug("Server exiting")
919
1206
 
920
1207
if __name__ == '__main__':
921
1208
    main()