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  • Committer: Teddy Hogeborn
  • Date: 2008-06-21 00:53:32 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080621005332-s4scjdpevuso4lsd
* server.py: Bug fix: Do "from __future__ import division".
  (Client.__init__): Bug fix: parse interval string from config file.
  (Client.check_action): Take no arguments.  Print some debugging
  output.  Reset "checker" to None.
  (Client.start_checker): Sleep 10 seconds before pinging to alleviate
  debugging.
  (Client.next_stop): Bug fix: check if "last_seen" and/or "checker"
  is None.
  (Client.still_valid): Bug fix: check if "last_seen" is None.
  (Client.handle): When finding the right password to send, use a list
  comprehension and an index lookup instead of a generator expression to
  a dict.
  (IPv6_TCPServer.request_queue_size): Removed.
  (in6addr_any): Moved inside "main".
  (main): Changed "clients" to be a Set instead of a list.  Bug fix:
  Exit when/if all clients are removed.  Call "select" with all client
  checkers and a suitable timeout.  Add some debugging output.  Start
  new checkers when needed and delete clients which have timed out.

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server.py
1
1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
# 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
# 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
12
 
# 
13
 
# Everything else is
14
 
# Copyright © 2008 Teddy Hogeborn
15
 
# Copyright © 2008 Björn Påhlsson
16
 
# 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
# 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
# 
31
 
# Contact the authors at <mandos@fukt.bsnet.se>.
32
 
# 
33
2
 
34
 
from __future__ import division, with_statement, absolute_import
 
3
from __future__ import division
35
4
 
36
5
import SocketServer
37
6
import socket
 
7
import select
38
8
from optparse import OptionParser
39
9
import datetime
40
10
import errno
41
11
import gnutls.crypto
42
12
import gnutls.connection
43
13
import gnutls.errors
44
 
import gnutls.library.functions
45
 
import gnutls.library.constants
46
 
import gnutls.library.types
47
14
import ConfigParser
48
15
import sys
49
16
import re
51
18
import signal
52
19
from sets import Set
53
20
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
from contextlib import closing
60
 
 
61
 
import dbus
62
 
import dbus.service
63
 
import gobject
64
 
import avahi
65
 
from dbus.mainloop.glib import DBusGMainLoop
66
 
import ctypes
67
 
import ctypes.util
68
 
 
69
 
version = "1.0.2"
70
 
 
71
 
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos: %(levelname)s: %(message)s'))
77
 
logger.addHandler(syslogger)
78
 
 
79
 
console = logging.StreamHandler()
80
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
81
 
                                       ' %(message)s'))
82
 
logger.addHandler(console)
83
 
 
84
 
class AvahiError(Exception):
85
 
    def __init__(self, value):
86
 
        self.value = value
87
 
        super(AvahiError, self).__init__()
88
 
    def __str__(self):
89
 
        return repr(self.value)
90
 
 
91
 
class AvahiServiceError(AvahiError):
92
 
    pass
93
 
 
94
 
class AvahiGroupError(AvahiError):
95
 
    pass
96
 
 
97
 
 
98
 
class AvahiService(object):
99
 
    """An Avahi (Zeroconf) service.
100
 
    Attributes:
101
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
102
 
               Used to optionally bind to the specified interface.
103
 
    name: string; Example: 'Mandos'
104
 
    type: string; Example: '_mandos._tcp'.
105
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
106
 
    port: integer; what port to announce
107
 
    TXT: list of strings; TXT record for the service
108
 
    domain: string; Domain to publish on, default to .local if empty.
109
 
    host: string; Host to publish records for, default is localhost
110
 
    max_renames: integer; maximum number of renames
111
 
    rename_count: integer; counter so we only rename after collisions
112
 
                  a sensible number of times
113
 
    """
114
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 servicetype = None, port = None, TXT = None,
116
 
                 domain = "", host = "", max_renames = 32768):
117
 
        self.interface = interface
118
 
        self.name = name
119
 
        self.type = servicetype
120
 
        self.port = port
121
 
        self.TXT = TXT if TXT is not None else []
122
 
        self.domain = domain
123
 
        self.host = host
124
 
        self.rename_count = 0
125
 
        self.max_renames = max_renames
126
 
    def rename(self):
127
 
        """Derived from the Avahi example code"""
128
 
        if self.rename_count >= self.max_renames:
129
 
            logger.critical(u"No suitable Zeroconf service name found"
130
 
                            u" after %i retries, exiting.",
131
 
                            self.rename_count)
132
 
            raise AvahiServiceError("Too many renames")
133
 
        self.name = server.GetAlternativeServiceName(self.name)
134
 
        logger.info(u"Changing Zeroconf service name to %r ...",
135
 
                    str(self.name))
136
 
        syslogger.setFormatter(logging.Formatter
137
 
                               ('Mandos (%s): %%(levelname)s:'
138
 
                                ' %%(message)s' % self.name))
139
 
        self.remove()
140
 
        self.add()
141
 
        self.rename_count += 1
142
 
    def remove(self):
143
 
        """Derived from the Avahi example code"""
144
 
        if group is not None:
145
 
            group.Reset()
146
 
    def add(self):
147
 
        """Derived from the Avahi example code"""
148
 
        global group
149
 
        if group is None:
150
 
            group = dbus.Interface(bus.get_object
151
 
                                   (avahi.DBUS_NAME,
152
 
                                    server.EntryGroupNew()),
153
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
 
            group.connect_to_signal('StateChanged',
155
 
                                    entry_group_state_changed)
156
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
157
 
                     service.name, service.type)
158
 
        group.AddService(
159
 
                self.interface,         # interface
160
 
                avahi.PROTO_INET6,      # protocol
161
 
                dbus.UInt32(0),         # flags
162
 
                self.name, self.type,
163
 
                self.domain, self.host,
164
 
                dbus.UInt16(self.port),
165
 
                avahi.string_array_to_txt_array(self.TXT))
166
 
        group.Commit()
167
 
 
168
 
# From the Avahi example code:
169
 
group = None                            # our entry group
170
 
# End of Avahi example code
171
 
 
172
 
 
173
 
def _datetime_to_dbus(dt, variant_level=0):
174
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
175
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
176
 
 
177
 
 
178
 
class Client(dbus.service.Object):
179
 
    """A representation of a client host served by this server.
180
 
    Attributes:
181
 
    name:       string; from the config file, used in log messages
182
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
183
 
                 uniquely identify the client
184
 
    secret:     bytestring; sent verbatim (over TLS) to client
185
 
    host:       string; available for use by the checker command
186
 
    created:    datetime.datetime(); (UTC) object creation
187
 
    last_enabled: datetime.datetime(); (UTC)
188
 
    enabled:    bool()
189
 
    last_checked_ok: datetime.datetime(); (UTC) or None
190
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
191
 
                                      until this client is invalid
192
 
    interval:   datetime.timedelta(); How often to start a new checker
193
 
    disable_hook:  If set, called by disable() as disable_hook(self)
194
 
    checker:    subprocess.Popen(); a running checker process used
195
 
                                    to see if the client lives.
196
 
                                    'None' if no process is running.
197
 
    checker_initiator_tag: a gobject event source tag, or None
198
 
    disable_initiator_tag:    - '' -
199
 
    checker_callback_tag:  - '' -
200
 
    checker_command: string; External command which is run to check if
201
 
                     client lives.  %() expansions are done at
202
 
                     runtime with vars(self) as dict, so that for
203
 
                     instance %(name)s can be used in the command.
204
 
    dbus_object_path: dbus.ObjectPath
205
 
    Private attibutes:
206
 
    _timeout: Real variable for 'timeout'
207
 
    _interval: Real variable for 'interval'
208
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
209
 
    _interval_milliseconds: - '' -
210
 
    """
211
 
    def _set_timeout(self, timeout):
212
 
        "Setter function for the 'timeout' attribute"
213
 
        self._timeout = timeout
214
 
        self._timeout_milliseconds = ((self.timeout.days
215
 
                                       * 24 * 60 * 60 * 1000)
216
 
                                      + (self.timeout.seconds * 1000)
217
 
                                      + (self.timeout.microseconds
218
 
                                         // 1000))
219
 
        # Emit D-Bus signal
220
 
        self.PropertyChanged(dbus.String(u"timeout"),
221
 
                             (dbus.UInt64(self._timeout_milliseconds,
222
 
                                          variant_level=1)))
223
 
    timeout = property(lambda self: self._timeout, _set_timeout)
224
 
    del _set_timeout
225
 
    
226
 
    def _set_interval(self, interval):
227
 
        "Setter function for the 'interval' attribute"
228
 
        self._interval = interval
229
 
        self._interval_milliseconds = ((self.interval.days
230
 
                                        * 24 * 60 * 60 * 1000)
231
 
                                       + (self.interval.seconds
232
 
                                          * 1000)
233
 
                                       + (self.interval.microseconds
234
 
                                          // 1000))
235
 
        # Emit D-Bus signal
236
 
        self.PropertyChanged(dbus.String(u"interval"),
237
 
                             (dbus.UInt64(self._interval_milliseconds,
238
 
                                          variant_level=1)))
239
 
    interval = property(lambda self: self._interval, _set_interval)
240
 
    del _set_interval
241
 
    
242
 
    def __init__(self, name = None, disable_hook=None, config=None):
243
 
        """Note: the 'checker' key in 'config' sets the
244
 
        'checker_command' attribute and *not* the 'checker'
245
 
        attribute."""
246
 
        self.dbus_object_path = (dbus.ObjectPath
247
 
                                 ("/Mandos/clients/"
248
 
                                  + name.replace(".", "_")))
249
 
        dbus.service.Object.__init__(self, bus,
250
 
                                     self.dbus_object_path)
251
 
        if config is None:
252
 
            config = {}
253
 
        self.name = name
254
 
        logger.debug(u"Creating client %r", self.name)
255
 
        # Uppercase and remove spaces from fingerprint for later
256
 
        # comparison purposes with return value from the fingerprint()
257
 
        # function
258
 
        self.fingerprint = (config["fingerprint"].upper()
259
 
                            .replace(u" ", u""))
260
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
261
 
        if "secret" in config:
262
 
            self.secret = config["secret"].decode(u"base64")
263
 
        elif "secfile" in config:
264
 
            with closing(open(os.path.expanduser
265
 
                              (os.path.expandvars
266
 
                               (config["secfile"])))) as secfile:
267
 
                self.secret = secfile.read()
268
 
        else:
269
 
            raise TypeError(u"No secret or secfile for client %s"
270
 
                            % self.name)
271
 
        self.host = config.get("host", "")
272
 
        self.created = datetime.datetime.utcnow()
273
 
        self.enabled = False
274
 
        self.last_enabled = None
275
 
        self.last_checked_ok = None
276
 
        self.timeout = string_to_delta(config["timeout"])
277
 
        self.interval = string_to_delta(config["interval"])
278
 
        self.disable_hook = disable_hook
 
21
 
 
22
class Client(object):
 
23
    def __init__(self, name=None, options=None, dn=None,
 
24
                 password=None, passfile=None, fqdn=None,
 
25
                 timeout=None, interval=-1):
 
26
        self.name = name
 
27
        self.dn = dn
 
28
        if password:
 
29
            self.password = password
 
30
        elif passfile:
 
31
            self.password = open(passfile).readall()
 
32
        else:
 
33
            print "No Password or Passfile in client config file"
 
34
            # raise RuntimeError XXX
 
35
            self.password = "gazonk"
 
36
        self.fqdn = fqdn                # string
 
37
        self.created = datetime.datetime.now()
 
38
        self.last_seen = None           # datetime.datetime()
 
39
        if timeout is None:
 
40
            timeout = options.timeout
 
41
        self.timeout = timeout          # datetime.timedelta()
 
42
        if interval == -1:
 
43
            interval = options.interval
 
44
        else:
 
45
            interval = string_to_delta(interval)
 
46
        self.interval = interval        # datetime.timedelta()
 
47
        self.next_check = datetime.datetime.now() # datetime.datetime()
 
48
        # Note: next_check may be in the past if checker is not None
 
49
        self.checker = None             # or a subprocess.Popen()
 
50
    def check_action(self):
 
51
        """The checker said something and might have completed.
 
52
        Check if is has, and take appropriate actions."""
 
53
        if self.checker.poll() is None:
 
54
            # False alarm, no result yet
 
55
            #self.checker.read()
 
56
            #print "Checker for %(name)s said nothing?" % vars(self)
 
57
            return
 
58
        now = datetime.datetime.now()
 
59
        if self.checker.returncode == 0:
 
60
            print "Checker for %(name)s succeeded" % vars(self)
 
61
            self.last_seen = now
 
62
        else:
 
63
            print "Checker for %(name)s failed" % vars(self)
 
64
        while self.next_check <= now:
 
65
            self.next_check += self.interval
279
66
        self.checker = None
280
 
        self.checker_initiator_tag = None
281
 
        self.disable_initiator_tag = None
282
 
        self.checker_callback_tag = None
283
 
        self.checker_command = config["checker"]
284
 
    
285
 
    def enable(self):
286
 
        """Start this client's checker and timeout hooks"""
287
 
        self.last_enabled = datetime.datetime.utcnow()
288
 
        # Schedule a new checker to be started an 'interval' from now,
289
 
        # and every interval from then on.
290
 
        self.checker_initiator_tag = (gobject.timeout_add
291
 
                                      (self._interval_milliseconds,
292
 
                                       self.start_checker))
293
 
        # Also start a new checker *right now*.
294
 
        self.start_checker()
295
 
        # Schedule a disable() when 'timeout' has passed
296
 
        self.disable_initiator_tag = (gobject.timeout_add
297
 
                                   (self._timeout_milliseconds,
298
 
                                    self.disable))
299
 
        self.enabled = True
300
 
        # Emit D-Bus signal
301
 
        self.PropertyChanged(dbus.String(u"enabled"),
302
 
                             dbus.Boolean(True, variant_level=1))
303
 
        self.PropertyChanged(dbus.String(u"last_enabled"),
304
 
                             (_datetime_to_dbus(self.last_enabled,
305
 
                                                variant_level=1)))
306
 
    
307
 
    def disable(self):
308
 
        """Disable this client."""
309
 
        if not getattr(self, "enabled", False):
310
 
            return False
311
 
        logger.info(u"Disabling client %s", self.name)
312
 
        if getattr(self, "disable_initiator_tag", False):
313
 
            gobject.source_remove(self.disable_initiator_tag)
314
 
            self.disable_initiator_tag = None
315
 
        if getattr(self, "checker_initiator_tag", False):
316
 
            gobject.source_remove(self.checker_initiator_tag)
317
 
            self.checker_initiator_tag = None
 
67
    handle_request = check_action
 
68
    def start_checker(self):
318
69
        self.stop_checker()
319
 
        if self.disable_hook:
320
 
            self.disable_hook(self)
321
 
        self.enabled = False
322
 
        # Emit D-Bus signal
323
 
        self.PropertyChanged(dbus.String(u"enabled"),
324
 
                             dbus.Boolean(False, variant_level=1))
325
 
        # Do not run this again if called by a gobject.timeout_add
326
 
        return False
327
 
    
328
 
    def __del__(self):
329
 
        self.disable_hook = None
330
 
        self.disable()
331
 
    
332
 
    def checker_callback(self, pid, condition, command):
333
 
        """The checker has completed, so take appropriate actions."""
334
 
        self.checker_callback_tag = None
335
 
        self.checker = None
336
 
        # Emit D-Bus signal
337
 
        self.PropertyChanged(dbus.String(u"checker_running"),
338
 
                             dbus.Boolean(False, variant_level=1))
339
 
        if (os.WIFEXITED(condition)
340
 
            and (os.WEXITSTATUS(condition) == 0)):
341
 
            logger.info(u"Checker for %(name)s succeeded",
342
 
                        vars(self))
343
 
            # Emit D-Bus signal
344
 
            self.CheckerCompleted(dbus.Boolean(True),
345
 
                                  dbus.UInt16(condition),
346
 
                                  dbus.String(command))
347
 
            self.bump_timeout()
348
 
        elif not os.WIFEXITED(condition):
349
 
            logger.warning(u"Checker for %(name)s crashed?",
350
 
                           vars(self))
351
 
            # Emit D-Bus signal
352
 
            self.CheckerCompleted(dbus.Boolean(False),
353
 
                                  dbus.UInt16(condition),
354
 
                                  dbus.String(command))
355
 
        else:
356
 
            logger.info(u"Checker for %(name)s failed",
357
 
                        vars(self))
358
 
            # Emit D-Bus signal
359
 
            self.CheckerCompleted(dbus.Boolean(False),
360
 
                                  dbus.UInt16(condition),
361
 
                                  dbus.String(command))
362
 
    
363
 
    def bump_timeout(self):
364
 
        """Bump up the timeout for this client.
365
 
        This should only be called when the client has been seen,
366
 
        alive and well.
367
 
        """
368
 
        self.last_checked_ok = datetime.datetime.utcnow()
369
 
        gobject.source_remove(self.disable_initiator_tag)
370
 
        self.disable_initiator_tag = (gobject.timeout_add
371
 
                                      (self._timeout_milliseconds,
372
 
                                       self.disable))
373
 
        self.PropertyChanged(dbus.String(u"last_checked_ok"),
374
 
                             (_datetime_to_dbus(self.last_checked_ok,
375
 
                                                variant_level=1)))
376
 
    
377
 
    def start_checker(self):
378
 
        """Start a new checker subprocess if one is not running.
379
 
        If a checker already exists, leave it running and do
380
 
        nothing."""
381
 
        # The reason for not killing a running checker is that if we
382
 
        # did that, then if a checker (for some reason) started
383
 
        # running slowly and taking more than 'interval' time, the
384
 
        # client would inevitably timeout, since no checker would get
385
 
        # a chance to run to completion.  If we instead leave running
386
 
        # checkers alone, the checker would have to take more time
387
 
        # than 'timeout' for the client to be declared invalid, which
388
 
        # is as it should be.
389
 
        if self.checker is None:
390
 
            try:
391
 
                # In case checker_command has exactly one % operator
392
 
                command = self.checker_command % self.host
393
 
            except TypeError:
394
 
                # Escape attributes for the shell
395
 
                escaped_attrs = dict((key, re.escape(str(val)))
396
 
                                     for key, val in
397
 
                                     vars(self).iteritems())
398
 
                try:
399
 
                    command = self.checker_command % escaped_attrs
400
 
                except TypeError, error:
401
 
                    logger.error(u'Could not format string "%s":'
402
 
                                 u' %s', self.checker_command, error)
403
 
                    return True # Try again later
404
 
            try:
405
 
                logger.info(u"Starting checker %r for %s",
406
 
                            command, self.name)
407
 
                # We don't need to redirect stdout and stderr, since
408
 
                # in normal mode, that is already done by daemon(),
409
 
                # and in debug mode we don't want to.  (Stdin is
410
 
                # always replaced by /dev/null.)
411
 
                self.checker = subprocess.Popen(command,
412
 
                                                close_fds=True,
413
 
                                                shell=True, cwd="/")
414
 
                # Emit D-Bus signal
415
 
                self.CheckerStarted(command)
416
 
                self.PropertyChanged(dbus.String("checker_running"),
417
 
                                     dbus.Boolean(True, variant_level=1))
418
 
                self.checker_callback_tag = (gobject.child_watch_add
419
 
                                             (self.checker.pid,
420
 
                                              self.checker_callback,
421
 
                                              data=command))
422
 
            except OSError, error:
423
 
                logger.error(u"Failed to start subprocess: %s",
424
 
                             error)
425
 
        # Re-run this periodically if run by gobject.timeout_add
426
 
        return True
427
 
    
 
70
        try:
 
71
            self.checker = subprocess.Popen("sleep 10; fping -q -- %s"
 
72
                                            % re.escape(self.fqdn),
 
73
                                            stdout=subprocess.PIPE,
 
74
                                            close_fds=True,
 
75
                                            shell=True, cwd="/")
 
76
        except subprocess.OSError, e:
 
77
            print "Failed to start subprocess:", e
428
78
    def stop_checker(self):
429
 
        """Force the checker process, if any, to stop."""
430
 
        if self.checker_callback_tag:
431
 
            gobject.source_remove(self.checker_callback_tag)
432
 
            self.checker_callback_tag = None
433
 
        if getattr(self, "checker", None) is None:
 
79
        if self.checker is None:
434
80
            return
435
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
436
 
        try:
437
 
            os.kill(self.checker.pid, signal.SIGTERM)
438
 
            #os.sleep(0.5)
439
 
            #if self.checker.poll() is None:
440
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
441
 
        except OSError, error:
442
 
            if error.errno != errno.ESRCH: # No such process
443
 
                raise
 
81
        os.kill(self.checker.pid, signal.SIGTERM)
 
82
        if self.checker.poll() is None:
 
83
            os.kill(self.checker.pid, signal.SIGKILL)
444
84
        self.checker = None
445
 
        self.PropertyChanged(dbus.String(u"checker_running"),
446
 
                             dbus.Boolean(False, variant_level=1))
447
 
    
448
 
    def still_valid(self):
449
 
        """Has the timeout not yet passed for this client?"""
450
 
        if not getattr(self, "enabled", False):
451
 
            return False
452
 
        now = datetime.datetime.utcnow()
453
 
        if self.last_checked_ok is None:
 
85
    __del__ = stop_checker
 
86
    def fileno(self):
 
87
        if self.checker is None:
 
88
            return None
 
89
        return self.checker.stdout.fileno()
 
90
    def next_stop(self):
 
91
        """The time when something must be done about this client
 
92
        May be in the past."""
 
93
        if self.last_seen is None:
 
94
            # This client has never been seen
 
95
            next_timeout = self.created + self.timeout
 
96
        else:
 
97
            next_timeout = self.last_seen + self.timeout
 
98
        if self.checker is None:
 
99
            return min(next_timeout, self.next_check)
 
100
        else:
 
101
            return next_timeout
 
102
    def still_valid(self, now=None):
 
103
        """Has this client's timeout not passed?"""
 
104
        if now is None:
 
105
            now = datetime.datetime.now()
 
106
        if self.last_seen is None:
454
107
            return now < (self.created + self.timeout)
455
108
        else:
456
 
            return now < (self.last_checked_ok + self.timeout)
457
 
    
458
 
    ## D-Bus methods & signals
459
 
    _interface = u"org.mandos_system.Mandos.Client"
460
 
    
461
 
    # BumpTimeout - method
462
 
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
463
 
    BumpTimeout.__name__ = "BumpTimeout"
464
 
    
465
 
    # CheckerCompleted - signal
466
 
    @dbus.service.signal(_interface, signature="bqs")
467
 
    def CheckerCompleted(self, success, condition, command):
468
 
        "D-Bus signal"
469
 
        pass
470
 
    
471
 
    # CheckerStarted - signal
472
 
    @dbus.service.signal(_interface, signature="s")
473
 
    def CheckerStarted(self, command):
474
 
        "D-Bus signal"
475
 
        pass
476
 
    
477
 
    # GetAllProperties - method
478
 
    @dbus.service.method(_interface, out_signature="a{sv}")
479
 
    def GetAllProperties(self):
480
 
        "D-Bus method"
481
 
        return dbus.Dictionary({
482
 
                dbus.String("name"):
483
 
                    dbus.String(self.name, variant_level=1),
484
 
                dbus.String("fingerprint"):
485
 
                    dbus.String(self.fingerprint, variant_level=1),
486
 
                dbus.String("host"):
487
 
                    dbus.String(self.host, variant_level=1),
488
 
                dbus.String("created"):
489
 
                    _datetime_to_dbus(self.created, variant_level=1),
490
 
                dbus.String("last_enabled"):
491
 
                    (_datetime_to_dbus(self.last_enabled,
492
 
                                       variant_level=1)
493
 
                     if self.last_enabled is not None
494
 
                     else dbus.Boolean(False, variant_level=1)),
495
 
                dbus.String("enabled"):
496
 
                    dbus.Boolean(self.enabled, variant_level=1),
497
 
                dbus.String("last_checked_ok"):
498
 
                    (_datetime_to_dbus(self.last_checked_ok,
499
 
                                       variant_level=1)
500
 
                     if self.last_checked_ok is not None
501
 
                     else dbus.Boolean (False, variant_level=1)),
502
 
                dbus.String("timeout"):
503
 
                    dbus.UInt64(self._timeout_milliseconds,
504
 
                                variant_level=1),
505
 
                dbus.String("interval"):
506
 
                    dbus.UInt64(self._interval_milliseconds,
507
 
                                variant_level=1),
508
 
                dbus.String("checker"):
509
 
                    dbus.String(self.checker_command,
510
 
                                variant_level=1),
511
 
                dbus.String("checker_running"):
512
 
                    dbus.Boolean(self.checker is not None,
513
 
                                 variant_level=1),
514
 
                }, signature="sv")
515
 
    
516
 
    # IsStillValid - method
517
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
518
 
                    (still_valid))
519
 
    IsStillValid.__name__ = "IsStillValid"
520
 
    
521
 
    # PropertyChanged - signal
522
 
    @dbus.service.signal(_interface, signature="sv")
523
 
    def PropertyChanged(self, property, value):
524
 
        "D-Bus signal"
525
 
        pass
526
 
    
527
 
    # SetChecker - method
528
 
    @dbus.service.method(_interface, in_signature="s")
529
 
    def SetChecker(self, checker):
530
 
        "D-Bus setter method"
531
 
        self.checker_command = checker
532
 
    
533
 
    # SetHost - method
534
 
    @dbus.service.method(_interface, in_signature="s")
535
 
    def SetHost(self, host):
536
 
        "D-Bus setter method"
537
 
        self.host = host
538
 
    
539
 
    # SetInterval - method
540
 
    @dbus.service.method(_interface, in_signature="t")
541
 
    def SetInterval(self, milliseconds):
542
 
        self.interval = datetime.timdeelta(0, 0, 0, milliseconds)
543
 
    
544
 
    # SetSecret - method
545
 
    @dbus.service.method(_interface, in_signature="ay",
546
 
                         byte_arrays=True)
547
 
    def SetSecret(self, secret):
548
 
        "D-Bus setter method"
549
 
        self.secret = str(secret)
550
 
    
551
 
    # SetTimeout - method
552
 
    @dbus.service.method(_interface, in_signature="t")
553
 
    def SetTimeout(self, milliseconds):
554
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
555
 
    
556
 
    # Enable - method
557
 
    Enable = dbus.service.method(_interface)(enable)
558
 
    Enable.__name__ = "Enable"
559
 
    
560
 
    # StartChecker - method
561
 
    @dbus.service.method(_interface)
562
 
    def StartChecker(self):
563
 
        "D-Bus method"
564
 
        self.start_checker()
565
 
    
566
 
    # Disable - method
567
 
    @dbus.service.method(_interface)
568
 
    def Disable(self):
569
 
        "D-Bus method"
570
 
        self.disable()
571
 
    
572
 
    # StopChecker - method
573
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
574
 
    StopChecker.__name__ = "StopChecker"
575
 
    
576
 
    del _interface
577
 
 
578
 
 
579
 
def peer_certificate(session):
580
 
    "Return the peer's OpenPGP certificate as a bytestring"
581
 
    # If not an OpenPGP certificate...
582
 
    if (gnutls.library.functions
583
 
        .gnutls_certificate_type_get(session._c_object)
584
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
585
 
        # ...do the normal thing
586
 
        return session.peer_certificate
587
 
    list_size = ctypes.c_uint()
588
 
    cert_list = (gnutls.library.functions
589
 
                 .gnutls_certificate_get_peers
590
 
                 (session._c_object, ctypes.byref(list_size)))
591
 
    if list_size.value == 0:
592
 
        return None
593
 
    cert = cert_list[0]
594
 
    return ctypes.string_at(cert.data, cert.size)
595
 
 
596
 
 
597
 
def fingerprint(openpgp):
598
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
599
 
    # New GnuTLS "datum" with the OpenPGP public key
600
 
    datum = (gnutls.library.types
601
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
602
 
                                         ctypes.POINTER
603
 
                                         (ctypes.c_ubyte)),
604
 
                             ctypes.c_uint(len(openpgp))))
605
 
    # New empty GnuTLS certificate
606
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
607
 
    (gnutls.library.functions
608
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
609
 
    # Import the OpenPGP public key into the certificate
610
 
    (gnutls.library.functions
611
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
612
 
                                gnutls.library.constants
613
 
                                .GNUTLS_OPENPGP_FMT_RAW))
614
 
    # Verify the self signature in the key
615
 
    crtverify = ctypes.c_uint()
616
 
    (gnutls.library.functions
617
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
618
 
    if crtverify.value != 0:
619
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
620
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
621
 
    # New buffer for the fingerprint
622
 
    buf = ctypes.create_string_buffer(20)
623
 
    buf_len = ctypes.c_size_t()
624
 
    # Get the fingerprint from the certificate into the buffer
625
 
    (gnutls.library.functions
626
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
627
 
                                         ctypes.byref(buf_len)))
628
 
    # Deinit the certificate
629
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
630
 
    # Convert the buffer to a Python bytestring
631
 
    fpr = ctypes.string_at(buf, buf_len.value)
632
 
    # Convert the bytestring to hexadecimal notation
633
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
634
 
    return hex_fpr
635
 
 
636
 
 
637
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
638
 
    """A TCP request handler class.
639
 
    Instantiated by IPv6_TCPServer for each request to handle it.
640
 
    Note: This will run in its own forked process."""
641
 
    
642
 
    def handle(self):
643
 
        logger.info(u"TCP connection from: %s",
644
 
                    unicode(self.client_address))
645
 
        session = (gnutls.connection
646
 
                   .ClientSession(self.request,
647
 
                                  gnutls.connection
648
 
                                  .X509Credentials()))
649
 
        
650
 
        line = self.request.makefile().readline()
651
 
        logger.debug(u"Protocol version: %r", line)
652
 
        try:
653
 
            if int(line.strip().split()[0]) > 1:
654
 
                raise RuntimeError
655
 
        except (ValueError, IndexError, RuntimeError), error:
656
 
            logger.error(u"Unknown protocol version: %s", error)
657
 
            return
658
 
        
659
 
        # Note: gnutls.connection.X509Credentials is really a generic
660
 
        # GnuTLS certificate credentials object so long as no X.509
661
 
        # keys are added to it.  Therefore, we can use it here despite
662
 
        # using OpenPGP certificates.
663
 
        
664
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
665
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
666
 
        #                "+DHE-DSS"))
667
 
        # Use a fallback default, since this MUST be set.
668
 
        priority = self.server.settings.get("priority", "NORMAL")
669
 
        (gnutls.library.functions
670
 
         .gnutls_priority_set_direct(session._c_object,
671
 
                                     priority, None))
672
 
        
673
 
        try:
674
 
            session.handshake()
675
 
        except gnutls.errors.GNUTLSError, error:
676
 
            logger.warning(u"Handshake failed: %s", error)
677
 
            # Do not run session.bye() here: the session is not
678
 
            # established.  Just abandon the request.
679
 
            return
680
 
        try:
681
 
            fpr = fingerprint(peer_certificate(session))
682
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
683
 
            logger.warning(u"Bad certificate: %s", error)
684
 
            session.bye()
685
 
            return
686
 
        logger.debug(u"Fingerprint: %s", fpr)
687
 
        for c in self.server.clients:
688
 
            if c.fingerprint == fpr:
689
 
                client = c
690
 
                break
691
 
        else:
692
 
            logger.warning(u"Client not found for fingerprint: %s",
693
 
                           fpr)
694
 
            session.bye()
695
 
            return
696
 
        # Have to check if client.still_valid(), since it is possible
697
 
        # that the client timed out while establishing the GnuTLS
698
 
        # session.
699
 
        if not client.still_valid():
700
 
            logger.warning(u"Client %(name)s is invalid",
701
 
                           vars(client))
702
 
            session.bye()
703
 
            return
704
 
        ## This won't work here, since we're in a fork.
705
 
        # client.bump_timeout()
706
 
        sent_size = 0
707
 
        while sent_size < len(client.secret):
708
 
            sent = session.send(client.secret[sent_size:])
709
 
            logger.debug(u"Sent: %d, remaining: %d",
710
 
                         sent, len(client.secret)
711
 
                         - (sent_size + sent))
712
 
            sent_size += sent
 
109
            return now < (self.last_seen + self.timeout)
 
110
    def it_is_time_to_check(self, now=None):
 
111
        if now is None:
 
112
            now = datetime.datetime.now()
 
113
        return self.next_check <= now
 
114
 
 
115
 
 
116
class server_metaclass(type):
 
117
    "Common behavior for the UDP and TCP server classes"
 
118
    def __new__(cls, name, bases, attrs):
 
119
        attrs["address_family"] = socket.AF_INET6
 
120
        attrs["allow_reuse_address"] = True
 
121
        def server_bind(self):
 
122
            if self.options.interface:
 
123
                if not hasattr(socket, "SO_BINDTODEVICE"):
 
124
                    # From /usr/include/asm-i486/socket.h
 
125
                    socket.SO_BINDTODEVICE = 25
 
126
                try:
 
127
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
128
                                           socket.SO_BINDTODEVICE,
 
129
                                           self.options.interface)
 
130
                except socket.error, error:
 
131
                    if error[0] == errno.EPERM:
 
132
                        print "Warning: No permission to bind to interface", \
 
133
                              self.options.interface
 
134
                    else:
 
135
                        raise error
 
136
            return super(type(self), self).server_bind()
 
137
        attrs["server_bind"] = server_bind
 
138
        def init(self, *args, **kwargs):
 
139
            if "options" in kwargs:
 
140
                self.options = kwargs["options"]
 
141
                del kwargs["options"]
 
142
            if "clients" in kwargs:
 
143
                self.clients = kwargs["clients"]
 
144
                del kwargs["clients"]
 
145
            if "credentials" in kwargs:
 
146
                self.credentials = kwargs["credentials"]
 
147
                del kwargs["credentials"]
 
148
            return super(type(self), self).__init__(*args, **kwargs)
 
149
        attrs["__init__"] = init
 
150
        return type.__new__(cls, name, bases, attrs)
 
151
 
 
152
 
 
153
class udp_handler(SocketServer.DatagramRequestHandler, object):
 
154
    def handle(self):
 
155
        self.wfile.write("Polo")
 
156
        print "UDP request answered"
 
157
 
 
158
 
 
159
class IPv6_UDPServer(SocketServer.UDPServer, object):
 
160
    __metaclass__ = server_metaclass
 
161
    def verify_request(self, request, client_address):
 
162
        print "UDP request came"
 
163
        return request[0] == "Marco"
 
164
 
 
165
 
 
166
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
167
    def handle(self):
 
168
        print "TCP request came"
 
169
        print "Request:", self.request
 
170
        print "Client Address:", self.client_address
 
171
        print "Server:", self.server
 
172
        session = gnutls.connection.ServerSession(self.request,
 
173
                                                  self.server.credentials)
 
174
        session.handshake()
 
175
        if session.peer_certificate:
 
176
            print "DN:", session.peer_certificate.subject
 
177
        try:
 
178
            session.verify_peer()
 
179
        except gnutls.errors.CertificateError, error:
 
180
            print "Verify failed", error
 
181
            session.bye()
 
182
            return
 
183
        try:
 
184
            session.send([client.password
 
185
                          for client in self.server.clients
 
186
                          if (client.dn ==
 
187
                              session.peer_certificate.subject)][0])
 
188
        except IndexError:
 
189
            session.send("gazonk")
 
190
            # Log maybe? XXX
713
191
        session.bye()
714
192
 
715
193
 
716
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
717
 
                     SocketServer.TCPServer, object):
718
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
719
 
    Attributes:
720
 
        settings:       Server settings
721
 
        clients:        Set() of Client objects
722
 
        enabled:        Boolean; whether this server is activated yet
723
 
    """
724
 
    address_family = socket.AF_INET6
725
 
    def __init__(self, *args, **kwargs):
726
 
        if "settings" in kwargs:
727
 
            self.settings = kwargs["settings"]
728
 
            del kwargs["settings"]
729
 
        if "clients" in kwargs:
730
 
            self.clients = kwargs["clients"]
731
 
            del kwargs["clients"]
732
 
        self.enabled = False
733
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
734
 
    def server_bind(self):
735
 
        """This overrides the normal server_bind() function
736
 
        to bind to an interface if one was specified, and also NOT to
737
 
        bind to an address or port if they were not specified."""
738
 
        if self.settings["interface"]:
739
 
            # 25 is from /usr/include/asm-i486/socket.h
740
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
741
 
            try:
742
 
                self.socket.setsockopt(socket.SOL_SOCKET,
743
 
                                       SO_BINDTODEVICE,
744
 
                                       self.settings["interface"])
745
 
            except socket.error, error:
746
 
                if error[0] == errno.EPERM:
747
 
                    logger.error(u"No permission to"
748
 
                                 u" bind to interface %s",
749
 
                                 self.settings["interface"])
750
 
                else:
751
 
                    raise error
752
 
        # Only bind(2) the socket if we really need to.
753
 
        if self.server_address[0] or self.server_address[1]:
754
 
            if not self.server_address[0]:
755
 
                in6addr_any = "::"
756
 
                self.server_address = (in6addr_any,
757
 
                                       self.server_address[1])
758
 
            elif not self.server_address[1]:
759
 
                self.server_address = (self.server_address[0],
760
 
                                       0)
761
 
#                 if self.settings["interface"]:
762
 
#                     self.server_address = (self.server_address[0],
763
 
#                                            0, # port
764
 
#                                            0, # flowinfo
765
 
#                                            if_nametoindex
766
 
#                                            (self.settings
767
 
#                                             ["interface"]))
768
 
            return super(IPv6_TCPServer, self).server_bind()
769
 
    def server_activate(self):
770
 
        if self.enabled:
771
 
            return super(IPv6_TCPServer, self).server_activate()
772
 
    def enable(self):
773
 
        self.enabled = True
 
194
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
195
    __metaclass__ = server_metaclass
774
196
 
775
197
 
776
198
def string_to_delta(interval):
786
208
    datetime.timedelta(1)
787
209
    >>> string_to_delta(u'1w')
788
210
    datetime.timedelta(7)
789
 
    >>> string_to_delta('5m 30s')
790
 
    datetime.timedelta(0, 330)
791
211
    """
792
 
    timevalue = datetime.timedelta(0)
793
 
    for s in interval.split():
794
 
        try:
795
 
            suffix = unicode(s[-1])
796
 
            value = int(s[:-1])
797
 
            if suffix == u"d":
798
 
                delta = datetime.timedelta(value)
799
 
            elif suffix == u"s":
800
 
                delta = datetime.timedelta(0, value)
801
 
            elif suffix == u"m":
802
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
803
 
            elif suffix == u"h":
804
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
805
 
            elif suffix == u"w":
806
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
807
 
            else:
808
 
                raise ValueError
809
 
        except (ValueError, IndexError):
 
212
    try:
 
213
        suffix=unicode(interval[-1])
 
214
        value=int(interval[:-1])
 
215
        if suffix == u"d":
 
216
            delta = datetime.timedelta(value)
 
217
        elif suffix == u"s":
 
218
            delta = datetime.timedelta(0, value)
 
219
        elif suffix == u"m":
 
220
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
221
        elif suffix == u"h":
 
222
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
223
        elif suffix == u"w":
 
224
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
225
        else:
810
226
            raise ValueError
811
 
        timevalue += delta
812
 
    return timevalue
813
 
 
814
 
 
815
 
def server_state_changed(state):
816
 
    """Derived from the Avahi example code"""
817
 
    if state == avahi.SERVER_COLLISION:
818
 
        logger.error(u"Zeroconf server name collision")
819
 
        service.remove()
820
 
    elif state == avahi.SERVER_RUNNING:
821
 
        service.add()
822
 
 
823
 
 
824
 
def entry_group_state_changed(state, error):
825
 
    """Derived from the Avahi example code"""
826
 
    logger.debug(u"Avahi state change: %i", state)
827
 
    
828
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
829
 
        logger.debug(u"Zeroconf service established.")
830
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
831
 
        logger.warning(u"Zeroconf service name collision.")
832
 
        service.rename()
833
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
834
 
        logger.critical(u"Avahi: Error in group state changed %s",
835
 
                        unicode(error))
836
 
        raise AvahiGroupError("State changed: %s", str(error))
837
 
 
838
 
def if_nametoindex(interface):
839
 
    """Call the C function if_nametoindex(), or equivalent"""
840
 
    global if_nametoindex
841
 
    try:
842
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
843
 
                          (ctypes.util.find_library("c"))
844
 
                          .if_nametoindex)
845
 
    except (OSError, AttributeError):
846
 
        if "struct" not in sys.modules:
847
 
            import struct
848
 
        if "fcntl" not in sys.modules:
849
 
            import fcntl
850
 
        def if_nametoindex(interface):
851
 
            "Get an interface index the hard way, i.e. using fcntl()"
852
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
853
 
            with closing(socket.socket()) as s:
854
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
855
 
                                    struct.pack("16s16x", interface))
856
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
857
 
            return interface_index
858
 
    return if_nametoindex(interface)
859
 
 
860
 
 
861
 
def daemon(nochdir = False, noclose = False):
862
 
    """See daemon(3).  Standard BSD Unix function.
863
 
    This should really exist as os.daemon, but it doesn't (yet)."""
864
 
    if os.fork():
865
 
        sys.exit()
866
 
    os.setsid()
867
 
    if not nochdir:
868
 
        os.chdir("/")
869
 
    if os.fork():
870
 
        sys.exit()
871
 
    if not noclose:
872
 
        # Close all standard open file descriptors
873
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
874
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
875
 
            raise OSError(errno.ENODEV,
876
 
                          "/dev/null not a character device")
877
 
        os.dup2(null, sys.stdin.fileno())
878
 
        os.dup2(null, sys.stdout.fileno())
879
 
        os.dup2(null, sys.stderr.fileno())
880
 
        if null > 2:
881
 
            os.close(null)
 
227
    except (ValueError, IndexError):
 
228
        raise ValueError
 
229
    return delta
882
230
 
883
231
 
884
232
def main():
885
 
    parser = OptionParser(version = "%%prog %s" % version)
 
233
    parser = OptionParser()
886
234
    parser.add_option("-i", "--interface", type="string",
887
 
                      metavar="IF", help="Bind to interface IF")
888
 
    parser.add_option("-a", "--address", type="string",
889
 
                      help="Address to listen for requests on")
890
 
    parser.add_option("-p", "--port", type="int",
 
235
                      default="eth0", metavar="IF",
 
236
                      help="Interface to bind to")
 
237
    parser.add_option("--cert", type="string", default="cert.pem",
 
238
                      metavar="FILE",
 
239
                      help="Public key certificate to use")
 
240
    parser.add_option("--key", type="string", default="key.pem",
 
241
                      metavar="FILE",
 
242
                      help="Private key to use")
 
243
    parser.add_option("--ca", type="string", default="ca.pem",
 
244
                      metavar="FILE",
 
245
                      help="Certificate Authority certificate to use")
 
246
    parser.add_option("--crl", type="string", default="crl.pem",
 
247
                      metavar="FILE",
 
248
                      help="Certificate Revokation List to use")
 
249
    parser.add_option("-p", "--port", type="int", default=49001,
891
250
                      help="Port number to receive requests on")
 
251
    parser.add_option("--dh", type="int", metavar="BITS",
 
252
                      help="DH group to use")
 
253
    parser.add_option("-t", "--timeout", type="string", # Parsed later
 
254
                      default="15m",
 
255
                      help="Amount of downtime allowed for clients")
 
256
    parser.add_option("--interval", type="string", # Parsed later
 
257
                      default="5m",
 
258
                      help="How often to check that a client is up")
892
259
    parser.add_option("--check", action="store_true", default=False,
893
260
                      help="Run self-test")
894
 
    parser.add_option("--debug", action="store_true",
895
 
                      help="Debug mode; run in foreground and log to"
896
 
                      " terminal")
897
 
    parser.add_option("--priority", type="string", help="GnuTLS"
898
 
                      " priority string (see GnuTLS documentation)")
899
 
    parser.add_option("--servicename", type="string", metavar="NAME",
900
 
                      help="Zeroconf service name")
901
 
    parser.add_option("--configdir", type="string",
902
 
                      default="/etc/mandos", metavar="DIR",
903
 
                      help="Directory to search for configuration"
904
 
                      " files")
905
 
    options = parser.parse_args()[0]
906
 
    
 
261
    (options, args) = parser.parse_args()
 
262
 
907
263
    if options.check:
908
264
        import doctest
909
265
        doctest.testmod()
910
266
        sys.exit()
911
267
    
912
 
    # Default values for config file for server-global settings
913
 
    server_defaults = { "interface": "",
914
 
                        "address": "",
915
 
                        "port": "",
916
 
                        "debug": "False",
917
 
                        "priority":
918
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
919
 
                        "servicename": "Mandos",
920
 
                        }
921
 
    
922
 
    # Parse config file for server-global settings
923
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
924
 
    del server_defaults
925
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
926
 
    # Convert the SafeConfigParser object to a dict
927
 
    server_settings = server_config.defaults()
928
 
    # Use getboolean on the boolean config option
929
 
    server_settings["debug"] = (server_config.getboolean
930
 
                                ("DEFAULT", "debug"))
931
 
    del server_config
932
 
    
933
 
    # Override the settings from the config file with command line
934
 
    # options, if set.
935
 
    for option in ("interface", "address", "port", "debug",
936
 
                   "priority", "servicename", "configdir"):
937
 
        value = getattr(options, option)
938
 
        if value is not None:
939
 
            server_settings[option] = value
940
 
    del options
941
 
    # Now we have our good server settings in "server_settings"
942
 
    
943
 
    debug = server_settings["debug"]
944
 
    
945
 
    if not debug:
946
 
        syslogger.setLevel(logging.WARNING)
947
 
        console.setLevel(logging.WARNING)
948
 
    
949
 
    if server_settings["servicename"] != "Mandos":
950
 
        syslogger.setFormatter(logging.Formatter
951
 
                               ('Mandos (%s): %%(levelname)s:'
952
 
                                ' %%(message)s'
953
 
                                % server_settings["servicename"]))
954
 
    
955
 
    # Parse config file with clients
956
 
    client_defaults = { "timeout": "1h",
957
 
                        "interval": "5m",
958
 
                        "checker": "fping -q -- %(host)s",
959
 
                        "host": "",
960
 
                        }
961
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
962
 
    client_config.read(os.path.join(server_settings["configdir"],
963
 
                                    "clients.conf"))
964
 
    
965
 
    clients = Set()
966
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
967
 
                                 server_settings["port"]),
968
 
                                TCP_handler,
969
 
                                settings=server_settings,
970
 
                                clients=clients)
971
 
    pidfilename = "/var/run/mandos.pid"
972
 
    try:
973
 
        pidfile = open(pidfilename, "w")
974
 
    except IOError, error:
975
 
        logger.error("Could not open file %r", pidfilename)
976
 
    
977
 
    try:
978
 
        uid = pwd.getpwnam("_mandos").pw_uid
979
 
    except KeyError:
980
 
        try:
981
 
            uid = pwd.getpwnam("mandos").pw_uid
982
 
        except KeyError:
983
 
            try:
984
 
                uid = pwd.getpwnam("nobody").pw_uid
985
 
            except KeyError:
986
 
                uid = 65534
987
 
    try:
988
 
        gid = pwd.getpwnam("_mandos").pw_gid
989
 
    except KeyError:
990
 
        try:
991
 
            gid = pwd.getpwnam("mandos").pw_gid
992
 
        except KeyError:
993
 
            try:
994
 
                gid = pwd.getpwnam("nogroup").pw_gid
995
 
            except KeyError:
996
 
                gid = 65534
997
 
    try:
998
 
        os.setuid(uid)
999
 
        os.setgid(gid)
1000
 
    except OSError, error:
1001
 
        if error[0] != errno.EPERM:
1002
 
            raise error
1003
 
    
1004
 
    global service
1005
 
    service = AvahiService(name = server_settings["servicename"],
1006
 
                           servicetype = "_mandos._tcp", )
1007
 
    if server_settings["interface"]:
1008
 
        service.interface = (if_nametoindex
1009
 
                             (server_settings["interface"]))
1010
 
    
1011
 
    global main_loop
1012
 
    global bus
1013
 
    global server
1014
 
    # From the Avahi example code
1015
 
    DBusGMainLoop(set_as_default=True )
1016
 
    main_loop = gobject.MainLoop()
1017
 
    bus = dbus.SystemBus()
1018
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1019
 
                                           avahi.DBUS_PATH_SERVER),
1020
 
                            avahi.DBUS_INTERFACE_SERVER)
1021
 
    # End of Avahi example code
1022
 
    bus_name = dbus.service.BusName(u"org.mandos-system.Mandos", bus)
1023
 
    
1024
 
    clients.update(Set(Client(name = section,
1025
 
                              config
1026
 
                              = dict(client_config.items(section)))
1027
 
                       for section in client_config.sections()))
1028
 
    if not clients:
1029
 
        logger.critical(u"No clients defined")
1030
 
        sys.exit(1)
1031
 
    
1032
 
    if debug:
1033
 
        # Redirect stdin so all checkers get /dev/null
1034
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1035
 
        os.dup2(null, sys.stdin.fileno())
1036
 
        if null > 2:
1037
 
            os.close(null)
1038
 
    else:
1039
 
        # No console logging
1040
 
        logger.removeHandler(console)
1041
 
        # Close all input and output, do double fork, etc.
1042
 
        daemon()
1043
 
    
1044
 
    try:
1045
 
        pid = os.getpid()
1046
 
        pidfile.write(str(pid) + "\n")
1047
 
        pidfile.close()
1048
 
        del pidfile
1049
 
    except IOError:
1050
 
        logger.error(u"Could not write to file %r with PID %d",
1051
 
                     pidfilename, pid)
1052
 
    except NameError:
1053
 
        # "pidfile" was never created
1054
 
        pass
1055
 
    del pidfilename
1056
 
    
1057
 
    def cleanup():
1058
 
        "Cleanup function; run on exit"
1059
 
        global group
1060
 
        # From the Avahi example code
1061
 
        if not group is None:
1062
 
            group.Free()
1063
 
            group = None
1064
 
        # End of Avahi example code
1065
 
        
1066
 
        while clients:
1067
 
            client = clients.pop()
1068
 
            client.disable_hook = None
1069
 
            client.disable()
1070
 
    
1071
 
    atexit.register(cleanup)
1072
 
    
1073
 
    if not debug:
1074
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1075
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1076
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1077
 
    
1078
 
    class MandosServer(dbus.service.Object):
1079
 
        """A D-Bus proxy object"""
1080
 
        def __init__(self):
1081
 
            dbus.service.Object.__init__(self, bus,
1082
 
                                         "/Mandos")
1083
 
        _interface = u"org.mandos_system.Mandos"
1084
 
        
1085
 
        @dbus.service.signal(_interface, signature="oa{sv}")
1086
 
        def ClientAdded(self, objpath, properties):
1087
 
            "D-Bus signal"
1088
 
            pass
1089
 
        
1090
 
        @dbus.service.signal(_interface, signature="o")
1091
 
        def ClientRemoved(self, objpath):
1092
 
            "D-Bus signal"
1093
 
            pass
1094
 
        
1095
 
        @dbus.service.method(_interface, out_signature="ao")
1096
 
        def GetAllClients(self):
1097
 
            return dbus.Array(c.dbus_object_path for c in clients)
1098
 
        
1099
 
        @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1100
 
        def GetAllClientsWithProperties(self):
1101
 
            return dbus.Dictionary(
1102
 
                ((c.dbus_object_path, c.GetAllProperties())
1103
 
                 for c in clients),
1104
 
                signature="oa{sv}")
1105
 
        
1106
 
        @dbus.service.method(_interface, in_signature="o")
1107
 
        def RemoveClient(self, object_path):
1108
 
            for c in clients:
1109
 
                if c.dbus_object_path == object_path:
1110
 
                    c.disable()
1111
 
                    clients.remove(c)
1112
 
                    return
1113
 
            raise KeyError
1114
 
        
1115
 
        del _interface
1116
 
    
1117
 
    mandos_server = MandosServer()
1118
 
    
 
268
    # Parse the time arguments
 
269
    try:
 
270
        options.timeout = string_to_delta(options.timeout)
 
271
    except ValueError:
 
272
        parser.error("option --timeout: Unparseable time")
 
273
    
 
274
    try:
 
275
        options.interval = string_to_delta(options.interval)
 
276
    except ValueError:
 
277
        parser.error("option --interval: Unparseable time")
 
278
    
 
279
    cert = gnutls.crypto.X509Certificate(open(options.cert).read())
 
280
    key = gnutls.crypto.X509PrivateKey(open(options.key).read())
 
281
    ca = gnutls.crypto.X509Certificate(open(options.ca).read())
 
282
    crl = gnutls.crypto.X509CRL(open(options.crl).read())
 
283
    cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
 
284
    
 
285
    # Parse config file
 
286
    defaults = {}
 
287
    client_config_object = ConfigParser.SafeConfigParser(defaults)
 
288
    client_config_object.read("mandos-clients.conf")
 
289
    clients = Set(Client(name=section, options=options,
 
290
                         **(dict(client_config_object\
 
291
                                 .items(section))))
 
292
                  for section in client_config_object.sections())
 
293
    
 
294
    in6addr_any = "::"
 
295
    udp_server = IPv6_UDPServer((in6addr_any, options.port),
 
296
                                udp_handler,
 
297
                                options=options)
 
298
    
 
299
    tcp_server = IPv6_TCPServer((in6addr_any, options.port),
 
300
                                tcp_handler,
 
301
                                options=options,
 
302
                                clients=clients,
 
303
                                credentials=cred)
 
304
    
 
305
    while True:
 
306
        if not clients:
 
307
            break
 
308
        try:
 
309
            next_stop = min(client.next_stop() for client in clients)
 
310
            now = datetime.datetime.now()
 
311
            if next_stop > now:
 
312
                delay = next_stop - now
 
313
                delay_seconds = (delay.days * 24 * 60 * 60
 
314
                                 + delay.seconds
 
315
                                 + delay.microseconds / 1000000)
 
316
                clients_with_checkers = tuple(client for client in
 
317
                                              clients
 
318
                                              if client.checker
 
319
                                              is not None)
 
320
                input_checks = (udp_server, tcp_server) \
 
321
                               + clients_with_checkers
 
322
                print "Waiting for network",
 
323
                if clients_with_checkers:
 
324
                    print "and checkers for:",
 
325
                    for client in clients_with_checkers:
 
326
                        print client.name,
 
327
                print
 
328
                input, out, err = select.select(input_checks, (), (),
 
329
                                                delay_seconds)
 
330
                for obj in input:
 
331
                    obj.handle_request()
 
332
            # start new checkers
 
333
            for client in clients:
 
334
                if client.it_is_time_to_check(now=now) and \
 
335
                       client.checker is None:
 
336
                    print "Starting checker for client %(name)s" \
 
337
                          % vars(client)
 
338
                    client.start_checker()
 
339
            # delete timed-out clients
 
340
            for client in clients.copy():
 
341
                if not client.still_valid(now=now):
 
342
                    # log xxx
 
343
                    print "Removing client %(name)s" % vars(client)
 
344
                    clients.remove(client)
 
345
        except KeyboardInterrupt:
 
346
            break
 
347
    
 
348
    # Cleanup here
1119
349
    for client in clients:
1120
 
        # Emit D-Bus signal
1121
 
        mandos_server.ClientAdded(client.dbus_object_path,
1122
 
                                  client.GetAllProperties())
1123
 
        client.enable()
1124
 
    
1125
 
    tcp_server.enable()
1126
 
    tcp_server.server_activate()
1127
 
    
1128
 
    # Find out what port we got
1129
 
    service.port = tcp_server.socket.getsockname()[1]
1130
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1131
 
                u" scope_id %d" % tcp_server.socket.getsockname())
1132
 
    
1133
 
    #service.interface = tcp_server.socket.getsockname()[3]
1134
 
    
1135
 
    try:
1136
 
        # From the Avahi example code
1137
 
        server.connect_to_signal("StateChanged", server_state_changed)
1138
 
        try:
1139
 
            server_state_changed(server.GetState())
1140
 
        except dbus.exceptions.DBusException, error:
1141
 
            logger.critical(u"DBusException: %s", error)
1142
 
            sys.exit(1)
1143
 
        # End of Avahi example code
1144
 
        
1145
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1146
 
                             lambda *args, **kwargs:
1147
 
                             (tcp_server.handle_request
1148
 
                              (*args[2:], **kwargs) or True))
1149
 
        
1150
 
        logger.debug(u"Starting main loop")
1151
 
        main_loop.run()
1152
 
    except AvahiError, error:
1153
 
        logger.critical(u"AvahiError: %s" + unicode(error))
1154
 
        sys.exit(1)
1155
 
    except KeyboardInterrupt:
1156
 
        if debug:
1157
 
            print
1158
 
 
1159
 
if __name__ == '__main__':
 
350
        client.stop_checker()
 
351
 
 
352
 
 
353
if __name__ == "__main__":
1160
354
    main()
 
355