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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_struct(dt, variant_level=0):
174
 
    """Convert a UTC datetime.datetime() to a D-Bus struct.
175
 
    The format is special to this application, since we could not find
176
 
    any other standard way."""
177
 
    return dbus.Struct((dbus.Int16(dt.year),
178
 
                        dbus.Byte(dt.month),
179
 
                        dbus.Byte(dt.day),
180
 
                        dbus.Byte(dt.hour),
181
 
                        dbus.Byte(dt.minute),
182
 
                        dbus.Byte(dt.second),
183
 
                        dbus.UInt32(dt.microsecond)),
184
 
                       signature="nyyyyyu",
185
 
                       variant_level=variant_level)
186
 
 
187
 
 
188
 
class Client(dbus.service.Object):
189
 
    """A representation of a client host served by this server.
190
 
    Attributes:
191
 
    name:       string; from the config file, used in log messages
192
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
193
 
                 uniquely identify the client
194
 
    secret:     bytestring; sent verbatim (over TLS) to client
195
 
    host:       string; available for use by the checker command
196
 
    created:    datetime.datetime(); (UTC) object creation
197
 
    last_started: datetime.datetime(); (UTC)
198
 
    started:    bool()
199
 
    last_checked_ok: datetime.datetime(); (UTC) or None
200
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
201
 
                                      until this client is invalid
202
 
    interval:   datetime.timedelta(); How often to start a new checker
203
 
    stop_hook:  If set, called by stop() as stop_hook(self)
204
 
    checker:    subprocess.Popen(); a running checker process used
205
 
                                    to see if the client lives.
206
 
                                    'None' if no process is running.
207
 
    checker_initiator_tag: a gobject event source tag, or None
208
 
    stop_initiator_tag:    - '' -
209
 
    checker_callback_tag:  - '' -
210
 
    checker_command: string; External command which is run to check if
211
 
                     client lives.  %() expansions are done at
212
 
                     runtime with vars(self) as dict, so that for
213
 
                     instance %(name)s can be used in the command.
214
 
    dbus_object_path: dbus.ObjectPath
215
 
    Private attibutes:
216
 
    _timeout: Real variable for 'timeout'
217
 
    _interval: Real variable for 'interval'
218
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
219
 
    _interval_milliseconds: - '' -
220
 
    """
221
 
    def _set_timeout(self, timeout):
222
 
        "Setter function for the 'timeout' attribute"
223
 
        self._timeout = timeout
224
 
        self._timeout_milliseconds = ((self.timeout.days
225
 
                                       * 24 * 60 * 60 * 1000)
226
 
                                      + (self.timeout.seconds * 1000)
227
 
                                      + (self.timeout.microseconds
228
 
                                         // 1000))
229
 
        # Emit D-Bus signal
230
 
        self.PropertyChanged(dbus.String(u"timeout"),
231
 
                             (dbus.UInt64(self._timeout_milliseconds,
232
 
                                          variant_level=1)))
233
 
    timeout = property(lambda self: self._timeout, _set_timeout)
234
 
    del _set_timeout
235
 
    
236
 
    def _set_interval(self, interval):
237
 
        "Setter function for the 'interval' attribute"
238
 
        self._interval = interval
239
 
        self._interval_milliseconds = ((self.interval.days
240
 
                                        * 24 * 60 * 60 * 1000)
241
 
                                       + (self.interval.seconds
242
 
                                          * 1000)
243
 
                                       + (self.interval.microseconds
244
 
                                          // 1000))
245
 
        # Emit D-Bus signal
246
 
        self.PropertyChanged(dbus.String(u"interval"),
247
 
                             (dbus.UInt64(self._interval_milliseconds,
248
 
                                          variant_level=1)))
249
 
    interval = property(lambda self: self._interval, _set_interval)
250
 
    del _set_interval
251
 
    
252
 
    def __init__(self, name = None, stop_hook=None, config=None):
253
 
        """Note: the 'checker' key in 'config' sets the
254
 
        'checker_command' attribute and *not* the 'checker'
255
 
        attribute."""
256
 
        self.dbus_object_path = (dbus.ObjectPath
257
 
                                 ("/Mandos/clients/"
258
 
                                  + name.replace(".", "_")))
259
 
        dbus.service.Object.__init__(self, bus,
260
 
                                     self.dbus_object_path)
261
 
        if config is None:
262
 
            config = {}
263
 
        self.name = name
264
 
        logger.debug(u"Creating client %r", self.name)
265
 
        # Uppercase and remove spaces from fingerprint for later
266
 
        # comparison purposes with return value from the fingerprint()
267
 
        # function
268
 
        self.fingerprint = (config["fingerprint"].upper()
269
 
                            .replace(u" ", u""))
270
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
271
 
        if "secret" in config:
272
 
            self.secret = config["secret"].decode(u"base64")
273
 
        elif "secfile" in config:
274
 
            with closing(open(os.path.expanduser
275
 
                              (os.path.expandvars
276
 
                               (config["secfile"])))) as secfile:
277
 
                self.secret = secfile.read()
278
 
        else:
279
 
            raise TypeError(u"No secret or secfile for client %s"
280
 
                            % self.name)
281
 
        self.host = config.get("host", "")
282
 
        self.created = datetime.datetime.utcnow()
283
 
        self.started = False
284
 
        self.last_started = None
285
 
        self.last_checked_ok = None
286
 
        self.timeout = string_to_delta(config["timeout"])
287
 
        self.interval = string_to_delta(config["interval"])
288
 
        self.stop_hook = stop_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
289
66
        self.checker = None
290
 
        self.checker_initiator_tag = None
291
 
        self.stop_initiator_tag = None
292
 
        self.checker_callback_tag = None
293
 
        self.checker_command = config["checker"]
294
 
    
295
 
    def start(self):
296
 
        """Start this client's checker and timeout hooks"""
297
 
        self.last_started = datetime.datetime.utcnow()
298
 
        # Schedule a new checker to be started an 'interval' from now,
299
 
        # and every interval from then on.
300
 
        self.checker_initiator_tag = (gobject.timeout_add
301
 
                                      (self._interval_milliseconds,
302
 
                                       self.start_checker))
303
 
        # Also start a new checker *right now*.
304
 
        self.start_checker()
305
 
        # Schedule a stop() when 'timeout' has passed
306
 
        self.stop_initiator_tag = (gobject.timeout_add
307
 
                                   (self._timeout_milliseconds,
308
 
                                    self.stop))
309
 
        self.started = True
310
 
        # Emit D-Bus signal
311
 
        self.PropertyChanged(dbus.String(u"started"),
312
 
                             dbus.Boolean(True, variant_level=1))
313
 
        self.PropertyChanged(dbus.String(u"last_started"),
314
 
                             (_datetime_to_dbus_struct
315
 
                              (self.last_started, variant_level=1)))
316
 
    
317
 
    def stop(self):
318
 
        """Stop this client."""
319
 
        if not getattr(self, "started", False):
320
 
            return False
321
 
        logger.info(u"Stopping client %s", self.name)
322
 
        if getattr(self, "stop_initiator_tag", False):
323
 
            gobject.source_remove(self.stop_initiator_tag)
324
 
            self.stop_initiator_tag = None
325
 
        if getattr(self, "checker_initiator_tag", False):
326
 
            gobject.source_remove(self.checker_initiator_tag)
327
 
            self.checker_initiator_tag = None
 
67
    handle_request = check_action
 
68
    def start_checker(self):
328
69
        self.stop_checker()
329
 
        if self.stop_hook:
330
 
            self.stop_hook(self)
331
 
        self.started = False
332
 
        # Emit D-Bus signal
333
 
        self.PropertyChanged(dbus.String(u"started"),
334
 
                             dbus.Boolean(False, variant_level=1))
335
 
        # Do not run this again if called by a gobject.timeout_add
336
 
        return False
337
 
    
338
 
    def __del__(self):
339
 
        self.stop_hook = None
340
 
        self.stop()
341
 
    
342
 
    def checker_callback(self, pid, condition, command):
343
 
        """The checker has completed, so take appropriate actions."""
344
 
        self.checker_callback_tag = None
345
 
        self.checker = None
346
 
        # Emit D-Bus signal
347
 
        self.PropertyChanged(dbus.String(u"checker_running"),
348
 
                             dbus.Boolean(False, variant_level=1))
349
 
        if (os.WIFEXITED(condition)
350
 
            and (os.WEXITSTATUS(condition) == 0)):
351
 
            logger.info(u"Checker for %(name)s succeeded",
352
 
                        vars(self))
353
 
            # Emit D-Bus signal
354
 
            self.CheckerCompleted(dbus.Boolean(True),
355
 
                                  dbus.UInt16(condition),
356
 
                                  dbus.String(command))
357
 
            self.bump_timeout()
358
 
        elif not os.WIFEXITED(condition):
359
 
            logger.warning(u"Checker for %(name)s crashed?",
360
 
                           vars(self))
361
 
            # Emit D-Bus signal
362
 
            self.CheckerCompleted(dbus.Boolean(False),
363
 
                                  dbus.UInt16(condition),
364
 
                                  dbus.String(command))
365
 
        else:
366
 
            logger.info(u"Checker for %(name)s failed",
367
 
                        vars(self))
368
 
            # Emit D-Bus signal
369
 
            self.CheckerCompleted(dbus.Boolean(False),
370
 
                                  dbus.UInt16(condition),
371
 
                                  dbus.String(command))
372
 
    
373
 
    def bump_timeout(self):
374
 
        """Bump up the timeout for this client.
375
 
        This should only be called when the client has been seen,
376
 
        alive and well.
377
 
        """
378
 
        self.last_checked_ok = datetime.datetime.utcnow()
379
 
        gobject.source_remove(self.stop_initiator_tag)
380
 
        self.stop_initiator_tag = (gobject.timeout_add
381
 
                                   (self._timeout_milliseconds,
382
 
                                    self.stop))
383
 
        self.PropertyChanged(dbus.String(u"last_checked_ok"),
384
 
                             (_datetime_to_dbus_struct
385
 
                              (self.last_checked_ok,
386
 
                               variant_level=1)))
387
 
    
388
 
    def start_checker(self):
389
 
        """Start a new checker subprocess if one is not running.
390
 
        If a checker already exists, leave it running and do
391
 
        nothing."""
392
 
        # The reason for not killing a running checker is that if we
393
 
        # did that, then if a checker (for some reason) started
394
 
        # running slowly and taking more than 'interval' time, the
395
 
        # client would inevitably timeout, since no checker would get
396
 
        # a chance to run to completion.  If we instead leave running
397
 
        # checkers alone, the checker would have to take more time
398
 
        # than 'timeout' for the client to be declared invalid, which
399
 
        # is as it should be.
400
 
        if self.checker is None:
401
 
            try:
402
 
                # In case checker_command has exactly one % operator
403
 
                command = self.checker_command % self.host
404
 
            except TypeError:
405
 
                # Escape attributes for the shell
406
 
                escaped_attrs = dict((key, re.escape(str(val)))
407
 
                                     for key, val in
408
 
                                     vars(self).iteritems())
409
 
                try:
410
 
                    command = self.checker_command % escaped_attrs
411
 
                except TypeError, error:
412
 
                    logger.error(u'Could not format string "%s":'
413
 
                                 u' %s', self.checker_command, error)
414
 
                    return True # Try again later
415
 
            try:
416
 
                logger.info(u"Starting checker %r for %s",
417
 
                            command, self.name)
418
 
                # We don't need to redirect stdout and stderr, since
419
 
                # in normal mode, that is already done by daemon(),
420
 
                # and in debug mode we don't want to.  (Stdin is
421
 
                # always replaced by /dev/null.)
422
 
                self.checker = subprocess.Popen(command,
423
 
                                                close_fds=True,
424
 
                                                shell=True, cwd="/")
425
 
                # Emit D-Bus signal
426
 
                self.CheckerStarted(command)
427
 
                self.PropertyChanged(dbus.String("checker_running"),
428
 
                                     dbus.Boolean(True, variant_level=1))
429
 
                self.checker_callback_tag = (gobject.child_watch_add
430
 
                                             (self.checker.pid,
431
 
                                              self.checker_callback,
432
 
                                              data=command))
433
 
            except OSError, error:
434
 
                logger.error(u"Failed to start subprocess: %s",
435
 
                             error)
436
 
        # Re-run this periodically if run by gobject.timeout_add
437
 
        return True
438
 
    
 
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
439
78
    def stop_checker(self):
440
 
        """Force the checker process, if any, to stop."""
441
 
        if self.checker_callback_tag:
442
 
            gobject.source_remove(self.checker_callback_tag)
443
 
            self.checker_callback_tag = None
444
 
        if getattr(self, "checker", None) is None:
 
79
        if self.checker is None:
445
80
            return
446
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
447
 
        try:
448
 
            os.kill(self.checker.pid, signal.SIGTERM)
449
 
            #os.sleep(0.5)
450
 
            #if self.checker.poll() is None:
451
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
452
 
        except OSError, error:
453
 
            if error.errno != errno.ESRCH: # No such process
454
 
                raise
 
81
        os.kill(self.checker.pid, signal.SIGTERM)
 
82
        if self.checker.poll() is None:
 
83
            os.kill(self.checker.pid, signal.SIGKILL)
455
84
        self.checker = None
456
 
        self.PropertyChanged(dbus.String(u"checker_running"),
457
 
                             dbus.Boolean(False, variant_level=1))
458
 
    
459
 
    def still_valid(self):
460
 
        """Has the timeout not yet passed for this client?"""
461
 
        if not getattr(self, "started", False):
462
 
            return False
463
 
        now = datetime.datetime.utcnow()
464
 
        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:
465
107
            return now < (self.created + self.timeout)
466
108
        else:
467
 
            return now < (self.last_checked_ok + self.timeout)
468
 
    
469
 
    ## D-Bus methods & signals
470
 
    _interface = u"org.mandos_system.Mandos.Client"
471
 
    
472
 
    # BumpTimeout - method
473
 
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
474
 
    BumpTimeout.__name__ = "BumpTimeout"
475
 
    
476
 
    # CheckerCompleted - signal
477
 
    @dbus.service.signal(_interface, signature="bqs")
478
 
    def CheckerCompleted(self, success, condition, command):
479
 
        "D-Bus signal"
480
 
        pass
481
 
    
482
 
    # CheckerStarted - signal
483
 
    @dbus.service.signal(_interface, signature="s")
484
 
    def CheckerStarted(self, command):
485
 
        "D-Bus signal"
486
 
        pass
487
 
    
488
 
    # GetAllProperties - method
489
 
    @dbus.service.method(_interface, out_signature="a{sv}")
490
 
    def GetAllProperties(self):
491
 
        "D-Bus method"
492
 
        return dbus.Dictionary({
493
 
                dbus.String("name"):
494
 
                    dbus.String(self.name, variant_level=1),
495
 
                dbus.String("fingerprint"):
496
 
                    dbus.String(self.fingerprint, variant_level=1),
497
 
                dbus.String("host"):
498
 
                    dbus.String(self.host, variant_level=1),
499
 
                dbus.String("created"):
500
 
                    _datetime_to_dbus_struct(self.created,
501
 
                                             variant_level=1),
502
 
                dbus.String("last_started"):
503
 
                    (_datetime_to_dbus_struct(self.last_started,
504
 
                                              variant_level=1)
505
 
                     if self.last_started is not None
506
 
                     else dbus.Boolean(False, variant_level=1)),
507
 
                dbus.String("started"):
508
 
                    dbus.Boolean(self.started, variant_level=1),
509
 
                dbus.String("last_checked_ok"):
510
 
                    (_datetime_to_dbus_struct(self.last_checked_ok,
511
 
                                              variant_level=1)
512
 
                     if self.last_checked_ok is not None
513
 
                     else dbus.Boolean (False, variant_level=1)),
514
 
                dbus.String("timeout"):
515
 
                    dbus.UInt64(self._timeout_milliseconds,
516
 
                                variant_level=1),
517
 
                dbus.String("interval"):
518
 
                    dbus.UInt64(self._interval_milliseconds,
519
 
                                variant_level=1),
520
 
                dbus.String("checker"):
521
 
                    dbus.String(self.checker_command,
522
 
                                variant_level=1),
523
 
                dbus.String("checker_running"):
524
 
                    dbus.Boolean(self.checker is not None,
525
 
                                 variant_level=1),
526
 
                }, signature="sv")
527
 
    
528
 
    # IsStillValid - method
529
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
530
 
                    (still_valid))
531
 
    IsStillValid.__name__ = "IsStillValid"
532
 
    
533
 
    # PropertyChanged - signal
534
 
    @dbus.service.signal(_interface, signature="sv")
535
 
    def PropertyChanged(self, property, value):
536
 
        "D-Bus signal"
537
 
        pass
538
 
    
539
 
    # SetChecker - method
540
 
    @dbus.service.method(_interface, in_signature="s")
541
 
    def SetChecker(self, checker):
542
 
        "D-Bus setter method"
543
 
        self.checker_command = checker
544
 
    
545
 
    # SetHost - method
546
 
    @dbus.service.method(_interface, in_signature="s")
547
 
    def SetHost(self, host):
548
 
        "D-Bus setter method"
549
 
        self.host = host
550
 
    
551
 
    # SetInterval - method
552
 
    @dbus.service.method(_interface, in_signature="t")
553
 
    def SetInterval(self, milliseconds):
554
 
        self.interval = datetime.timdeelta(0, 0, 0, milliseconds)
555
 
    
556
 
    # SetSecret - method
557
 
    @dbus.service.method(_interface, in_signature="ay",
558
 
                         byte_arrays=True)
559
 
    def SetSecret(self, secret):
560
 
        "D-Bus setter method"
561
 
        self.secret = str(secret)
562
 
    
563
 
    # SetTimeout - method
564
 
    @dbus.service.method(_interface, in_signature="t")
565
 
    def SetTimeout(self, milliseconds):
566
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
567
 
    
568
 
    # Start - method
569
 
    Start = dbus.service.method(_interface)(start)
570
 
    Start.__name__ = "Start"
571
 
    
572
 
    # StartChecker - method
573
 
    @dbus.service.method(_interface)
574
 
    def StartChecker(self):
575
 
        "D-Bus method"
576
 
        self.start_checker()
577
 
    
578
 
    # Stop - method
579
 
    @dbus.service.method(_interface)
580
 
    def Stop(self):
581
 
        "D-Bus method"
582
 
        self.stop()
583
 
    
584
 
    # StopChecker - method
585
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
586
 
    StopChecker.__name__ = "StopChecker"
587
 
    
588
 
    del _interface
589
 
 
590
 
 
591
 
def peer_certificate(session):
592
 
    "Return the peer's OpenPGP certificate as a bytestring"
593
 
    # If not an OpenPGP certificate...
594
 
    if (gnutls.library.functions
595
 
        .gnutls_certificate_type_get(session._c_object)
596
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
597
 
        # ...do the normal thing
598
 
        return session.peer_certificate
599
 
    list_size = ctypes.c_uint()
600
 
    cert_list = (gnutls.library.functions
601
 
                 .gnutls_certificate_get_peers
602
 
                 (session._c_object, ctypes.byref(list_size)))
603
 
    if list_size.value == 0:
604
 
        return None
605
 
    cert = cert_list[0]
606
 
    return ctypes.string_at(cert.data, cert.size)
607
 
 
608
 
 
609
 
def fingerprint(openpgp):
610
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
611
 
    # New GnuTLS "datum" with the OpenPGP public key
612
 
    datum = (gnutls.library.types
613
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
614
 
                                         ctypes.POINTER
615
 
                                         (ctypes.c_ubyte)),
616
 
                             ctypes.c_uint(len(openpgp))))
617
 
    # New empty GnuTLS certificate
618
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
619
 
    (gnutls.library.functions
620
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
621
 
    # Import the OpenPGP public key into the certificate
622
 
    (gnutls.library.functions
623
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
624
 
                                gnutls.library.constants
625
 
                                .GNUTLS_OPENPGP_FMT_RAW))
626
 
    # Verify the self signature in the key
627
 
    crtverify = ctypes.c_uint()
628
 
    (gnutls.library.functions
629
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
630
 
    if crtverify.value != 0:
631
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
632
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
633
 
    # New buffer for the fingerprint
634
 
    buf = ctypes.create_string_buffer(20)
635
 
    buf_len = ctypes.c_size_t()
636
 
    # Get the fingerprint from the certificate into the buffer
637
 
    (gnutls.library.functions
638
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
639
 
                                         ctypes.byref(buf_len)))
640
 
    # Deinit the certificate
641
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
642
 
    # Convert the buffer to a Python bytestring
643
 
    fpr = ctypes.string_at(buf, buf_len.value)
644
 
    # Convert the bytestring to hexadecimal notation
645
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
646
 
    return hex_fpr
647
 
 
648
 
 
649
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
650
 
    """A TCP request handler class.
651
 
    Instantiated by IPv6_TCPServer for each request to handle it.
652
 
    Note: This will run in its own forked process."""
653
 
    
654
 
    def handle(self):
655
 
        logger.info(u"TCP connection from: %s",
656
 
                    unicode(self.client_address))
657
 
        session = (gnutls.connection
658
 
                   .ClientSession(self.request,
659
 
                                  gnutls.connection
660
 
                                  .X509Credentials()))
661
 
        
662
 
        line = self.request.makefile().readline()
663
 
        logger.debug(u"Protocol version: %r", line)
664
 
        try:
665
 
            if int(line.strip().split()[0]) > 1:
666
 
                raise RuntimeError
667
 
        except (ValueError, IndexError, RuntimeError), error:
668
 
            logger.error(u"Unknown protocol version: %s", error)
669
 
            return
670
 
        
671
 
        # Note: gnutls.connection.X509Credentials is really a generic
672
 
        # GnuTLS certificate credentials object so long as no X.509
673
 
        # keys are added to it.  Therefore, we can use it here despite
674
 
        # using OpenPGP certificates.
675
 
        
676
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
677
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
678
 
        #                "+DHE-DSS"))
679
 
        # Use a fallback default, since this MUST be set.
680
 
        priority = self.server.settings.get("priority", "NORMAL")
681
 
        (gnutls.library.functions
682
 
         .gnutls_priority_set_direct(session._c_object,
683
 
                                     priority, None))
684
 
        
685
 
        try:
686
 
            session.handshake()
687
 
        except gnutls.errors.GNUTLSError, error:
688
 
            logger.warning(u"Handshake failed: %s", error)
689
 
            # Do not run session.bye() here: the session is not
690
 
            # established.  Just abandon the request.
691
 
            return
692
 
        try:
693
 
            fpr = fingerprint(peer_certificate(session))
694
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
695
 
            logger.warning(u"Bad certificate: %s", error)
696
 
            session.bye()
697
 
            return
698
 
        logger.debug(u"Fingerprint: %s", fpr)
699
 
        for c in self.server.clients:
700
 
            if c.fingerprint == fpr:
701
 
                client = c
702
 
                break
703
 
        else:
704
 
            logger.warning(u"Client not found for fingerprint: %s",
705
 
                           fpr)
706
 
            session.bye()
707
 
            return
708
 
        # Have to check if client.still_valid(), since it is possible
709
 
        # that the client timed out while establishing the GnuTLS
710
 
        # session.
711
 
        if not client.still_valid():
712
 
            logger.warning(u"Client %(name)s is invalid",
713
 
                           vars(client))
714
 
            session.bye()
715
 
            return
716
 
        ## This won't work here, since we're in a fork.
717
 
        # client.bump_timeout()
718
 
        sent_size = 0
719
 
        while sent_size < len(client.secret):
720
 
            sent = session.send(client.secret[sent_size:])
721
 
            logger.debug(u"Sent: %d, remaining: %d",
722
 
                         sent, len(client.secret)
723
 
                         - (sent_size + sent))
724
 
            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
725
191
        session.bye()
726
192
 
727
193
 
728
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
729
 
                     SocketServer.TCPServer, object):
730
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
731
 
    Attributes:
732
 
        settings:       Server settings
733
 
        clients:        Set() of Client objects
734
 
        enabled:        Boolean; whether this server is activated yet
735
 
    """
736
 
    address_family = socket.AF_INET6
737
 
    def __init__(self, *args, **kwargs):
738
 
        if "settings" in kwargs:
739
 
            self.settings = kwargs["settings"]
740
 
            del kwargs["settings"]
741
 
        if "clients" in kwargs:
742
 
            self.clients = kwargs["clients"]
743
 
            del kwargs["clients"]
744
 
        self.enabled = False
745
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
746
 
    def server_bind(self):
747
 
        """This overrides the normal server_bind() function
748
 
        to bind to an interface if one was specified, and also NOT to
749
 
        bind to an address or port if they were not specified."""
750
 
        if self.settings["interface"]:
751
 
            # 25 is from /usr/include/asm-i486/socket.h
752
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
753
 
            try:
754
 
                self.socket.setsockopt(socket.SOL_SOCKET,
755
 
                                       SO_BINDTODEVICE,
756
 
                                       self.settings["interface"])
757
 
            except socket.error, error:
758
 
                if error[0] == errno.EPERM:
759
 
                    logger.error(u"No permission to"
760
 
                                 u" bind to interface %s",
761
 
                                 self.settings["interface"])
762
 
                else:
763
 
                    raise error
764
 
        # Only bind(2) the socket if we really need to.
765
 
        if self.server_address[0] or self.server_address[1]:
766
 
            if not self.server_address[0]:
767
 
                in6addr_any = "::"
768
 
                self.server_address = (in6addr_any,
769
 
                                       self.server_address[1])
770
 
            elif not self.server_address[1]:
771
 
                self.server_address = (self.server_address[0],
772
 
                                       0)
773
 
#                 if self.settings["interface"]:
774
 
#                     self.server_address = (self.server_address[0],
775
 
#                                            0, # port
776
 
#                                            0, # flowinfo
777
 
#                                            if_nametoindex
778
 
#                                            (self.settings
779
 
#                                             ["interface"]))
780
 
            return super(IPv6_TCPServer, self).server_bind()
781
 
    def server_activate(self):
782
 
        if self.enabled:
783
 
            return super(IPv6_TCPServer, self).server_activate()
784
 
    def enable(self):
785
 
        self.enabled = True
 
194
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
195
    __metaclass__ = server_metaclass
786
196
 
787
197
 
788
198
def string_to_delta(interval):
798
208
    datetime.timedelta(1)
799
209
    >>> string_to_delta(u'1w')
800
210
    datetime.timedelta(7)
801
 
    >>> string_to_delta('5m 30s')
802
 
    datetime.timedelta(0, 330)
803
211
    """
804
 
    timevalue = datetime.timedelta(0)
805
 
    for s in interval.split():
806
 
        try:
807
 
            suffix = unicode(s[-1])
808
 
            value = int(s[:-1])
809
 
            if suffix == u"d":
810
 
                delta = datetime.timedelta(value)
811
 
            elif suffix == u"s":
812
 
                delta = datetime.timedelta(0, value)
813
 
            elif suffix == u"m":
814
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
815
 
            elif suffix == u"h":
816
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
817
 
            elif suffix == u"w":
818
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
819
 
            else:
820
 
                raise ValueError
821
 
        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:
822
226
            raise ValueError
823
 
        timevalue += delta
824
 
    return timevalue
825
 
 
826
 
 
827
 
def server_state_changed(state):
828
 
    """Derived from the Avahi example code"""
829
 
    if state == avahi.SERVER_COLLISION:
830
 
        logger.error(u"Zeroconf server name collision")
831
 
        service.remove()
832
 
    elif state == avahi.SERVER_RUNNING:
833
 
        service.add()
834
 
 
835
 
 
836
 
def entry_group_state_changed(state, error):
837
 
    """Derived from the Avahi example code"""
838
 
    logger.debug(u"Avahi state change: %i", state)
839
 
    
840
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
841
 
        logger.debug(u"Zeroconf service established.")
842
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
843
 
        logger.warning(u"Zeroconf service name collision.")
844
 
        service.rename()
845
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
846
 
        logger.critical(u"Avahi: Error in group state changed %s",
847
 
                        unicode(error))
848
 
        raise AvahiGroupError("State changed: %s", str(error))
849
 
 
850
 
def if_nametoindex(interface):
851
 
    """Call the C function if_nametoindex(), or equivalent"""
852
 
    global if_nametoindex
853
 
    try:
854
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
855
 
                          (ctypes.util.find_library("c"))
856
 
                          .if_nametoindex)
857
 
    except (OSError, AttributeError):
858
 
        if "struct" not in sys.modules:
859
 
            import struct
860
 
        if "fcntl" not in sys.modules:
861
 
            import fcntl
862
 
        def if_nametoindex(interface):
863
 
            "Get an interface index the hard way, i.e. using fcntl()"
864
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
865
 
            with closing(socket.socket()) as s:
866
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
867
 
                                    struct.pack("16s16x", interface))
868
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
869
 
            return interface_index
870
 
    return if_nametoindex(interface)
871
 
 
872
 
 
873
 
def daemon(nochdir = False, noclose = False):
874
 
    """See daemon(3).  Standard BSD Unix function.
875
 
    This should really exist as os.daemon, but it doesn't (yet)."""
876
 
    if os.fork():
877
 
        sys.exit()
878
 
    os.setsid()
879
 
    if not nochdir:
880
 
        os.chdir("/")
881
 
    if os.fork():
882
 
        sys.exit()
883
 
    if not noclose:
884
 
        # Close all standard open file descriptors
885
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
886
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
887
 
            raise OSError(errno.ENODEV,
888
 
                          "/dev/null not a character device")
889
 
        os.dup2(null, sys.stdin.fileno())
890
 
        os.dup2(null, sys.stdout.fileno())
891
 
        os.dup2(null, sys.stderr.fileno())
892
 
        if null > 2:
893
 
            os.close(null)
 
227
    except (ValueError, IndexError):
 
228
        raise ValueError
 
229
    return delta
894
230
 
895
231
 
896
232
def main():
897
 
    parser = OptionParser(version = "%%prog %s" % version)
 
233
    parser = OptionParser()
898
234
    parser.add_option("-i", "--interface", type="string",
899
 
                      metavar="IF", help="Bind to interface IF")
900
 
    parser.add_option("-a", "--address", type="string",
901
 
                      help="Address to listen for requests on")
902
 
    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,
903
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")
904
259
    parser.add_option("--check", action="store_true", default=False,
905
260
                      help="Run self-test")
906
 
    parser.add_option("--debug", action="store_true",
907
 
                      help="Debug mode; run in foreground and log to"
908
 
                      " terminal")
909
 
    parser.add_option("--priority", type="string", help="GnuTLS"
910
 
                      " priority string (see GnuTLS documentation)")
911
 
    parser.add_option("--servicename", type="string", metavar="NAME",
912
 
                      help="Zeroconf service name")
913
 
    parser.add_option("--configdir", type="string",
914
 
                      default="/etc/mandos", metavar="DIR",
915
 
                      help="Directory to search for configuration"
916
 
                      " files")
917
 
    options = parser.parse_args()[0]
918
 
    
 
261
    (options, args) = parser.parse_args()
 
262
 
919
263
    if options.check:
920
264
        import doctest
921
265
        doctest.testmod()
922
266
        sys.exit()
923
267
    
924
 
    # Default values for config file for server-global settings
925
 
    server_defaults = { "interface": "",
926
 
                        "address": "",
927
 
                        "port": "",
928
 
                        "debug": "False",
929
 
                        "priority":
930
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
931
 
                        "servicename": "Mandos",
932
 
                        }
933
 
    
934
 
    # Parse config file for server-global settings
935
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
936
 
    del server_defaults
937
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
938
 
    # Convert the SafeConfigParser object to a dict
939
 
    server_settings = server_config.defaults()
940
 
    # Use getboolean on the boolean config option
941
 
    server_settings["debug"] = (server_config.getboolean
942
 
                                ("DEFAULT", "debug"))
943
 
    del server_config
944
 
    
945
 
    # Override the settings from the config file with command line
946
 
    # options, if set.
947
 
    for option in ("interface", "address", "port", "debug",
948
 
                   "priority", "servicename", "configdir"):
949
 
        value = getattr(options, option)
950
 
        if value is not None:
951
 
            server_settings[option] = value
952
 
    del options
953
 
    # Now we have our good server settings in "server_settings"
954
 
    
955
 
    debug = server_settings["debug"]
956
 
    
957
 
    if not debug:
958
 
        syslogger.setLevel(logging.WARNING)
959
 
        console.setLevel(logging.WARNING)
960
 
    
961
 
    if server_settings["servicename"] != "Mandos":
962
 
        syslogger.setFormatter(logging.Formatter
963
 
                               ('Mandos (%s): %%(levelname)s:'
964
 
                                ' %%(message)s'
965
 
                                % server_settings["servicename"]))
966
 
    
967
 
    # Parse config file with clients
968
 
    client_defaults = { "timeout": "1h",
969
 
                        "interval": "5m",
970
 
                        "checker": "fping -q -- %(host)s",
971
 
                        "host": "",
972
 
                        }
973
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
974
 
    client_config.read(os.path.join(server_settings["configdir"],
975
 
                                    "clients.conf"))
976
 
    
977
 
    clients = Set()
978
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
979
 
                                 server_settings["port"]),
980
 
                                TCP_handler,
981
 
                                settings=server_settings,
982
 
                                clients=clients)
983
 
    pidfilename = "/var/run/mandos.pid"
984
 
    try:
985
 
        pidfile = open(pidfilename, "w")
986
 
    except IOError, error:
987
 
        logger.error("Could not open file %r", pidfilename)
988
 
    
989
 
    try:
990
 
        uid = pwd.getpwnam("_mandos").pw_uid
991
 
    except KeyError:
992
 
        try:
993
 
            uid = pwd.getpwnam("mandos").pw_uid
994
 
        except KeyError:
995
 
            try:
996
 
                uid = pwd.getpwnam("nobody").pw_uid
997
 
            except KeyError:
998
 
                uid = 65534
999
 
    try:
1000
 
        gid = pwd.getpwnam("_mandos").pw_gid
1001
 
    except KeyError:
1002
 
        try:
1003
 
            gid = pwd.getpwnam("mandos").pw_gid
1004
 
        except KeyError:
1005
 
            try:
1006
 
                gid = pwd.getpwnam("nogroup").pw_gid
1007
 
            except KeyError:
1008
 
                gid = 65534
1009
 
    try:
1010
 
        os.setuid(uid)
1011
 
        os.setgid(gid)
1012
 
    except OSError, error:
1013
 
        if error[0] != errno.EPERM:
1014
 
            raise error
1015
 
    
1016
 
    global service
1017
 
    service = AvahiService(name = server_settings["servicename"],
1018
 
                           servicetype = "_mandos._tcp", )
1019
 
    if server_settings["interface"]:
1020
 
        service.interface = (if_nametoindex
1021
 
                             (server_settings["interface"]))
1022
 
    
1023
 
    global main_loop
1024
 
    global bus
1025
 
    global server
1026
 
    # From the Avahi example code
1027
 
    DBusGMainLoop(set_as_default=True )
1028
 
    main_loop = gobject.MainLoop()
1029
 
    bus = dbus.SystemBus()
1030
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1031
 
                                           avahi.DBUS_PATH_SERVER),
1032
 
                            avahi.DBUS_INTERFACE_SERVER)
1033
 
    # End of Avahi example code
1034
 
    bus_name = dbus.service.BusName(u"org.mandos-system.Mandos", bus)
1035
 
    
1036
 
    clients.update(Set(Client(name = section,
1037
 
                              config
1038
 
                              = dict(client_config.items(section)))
1039
 
                       for section in client_config.sections()))
1040
 
    if not clients:
1041
 
        logger.critical(u"No clients defined")
1042
 
        sys.exit(1)
1043
 
    
1044
 
    if debug:
1045
 
        # Redirect stdin so all checkers get /dev/null
1046
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1047
 
        os.dup2(null, sys.stdin.fileno())
1048
 
        if null > 2:
1049
 
            os.close(null)
1050
 
    else:
1051
 
        # No console logging
1052
 
        logger.removeHandler(console)
1053
 
        # Close all input and output, do double fork, etc.
1054
 
        daemon()
1055
 
    
1056
 
    try:
1057
 
        pid = os.getpid()
1058
 
        pidfile.write(str(pid) + "\n")
1059
 
        pidfile.close()
1060
 
        del pidfile
1061
 
    except IOError:
1062
 
        logger.error(u"Could not write to file %r with PID %d",
1063
 
                     pidfilename, pid)
1064
 
    except NameError:
1065
 
        # "pidfile" was never created
1066
 
        pass
1067
 
    del pidfilename
1068
 
    
1069
 
    def cleanup():
1070
 
        "Cleanup function; run on exit"
1071
 
        global group
1072
 
        # From the Avahi example code
1073
 
        if not group is None:
1074
 
            group.Free()
1075
 
            group = None
1076
 
        # End of Avahi example code
1077
 
        
1078
 
        while clients:
1079
 
            client = clients.pop()
1080
 
            client.stop_hook = None
1081
 
            client.stop()
1082
 
    
1083
 
    atexit.register(cleanup)
1084
 
    
1085
 
    if not debug:
1086
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1087
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1088
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1089
 
    
1090
 
    class MandosServer(dbus.service.Object):
1091
 
        """A D-Bus proxy object"""
1092
 
        def __init__(self):
1093
 
            dbus.service.Object.__init__(self, bus,
1094
 
                                         "/Mandos")
1095
 
        _interface = u"org.mandos_system.Mandos"
1096
 
        
1097
 
        @dbus.service.signal(_interface, signature="oa{sv}")
1098
 
        def ClientAdded(self, objpath, properties):
1099
 
            "D-Bus signal"
1100
 
            pass
1101
 
        
1102
 
        @dbus.service.signal(_interface, signature="o")
1103
 
        def ClientRemoved(self, objpath):
1104
 
            "D-Bus signal"
1105
 
            pass
1106
 
        
1107
 
        @dbus.service.method(_interface, out_signature="ao")
1108
 
        def GetAllClients(self):
1109
 
            return dbus.Array(c.dbus_object_path for c in clients)
1110
 
        
1111
 
        @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1112
 
        def GetAllClientsWithProperties(self):
1113
 
            return dbus.Dictionary(
1114
 
                ((c.dbus_object_path, c.GetAllProperties())
1115
 
                 for c in clients),
1116
 
                signature="oa{sv}")
1117
 
        
1118
 
        @dbus.service.method(_interface, in_signature="o")
1119
 
        def RemoveClient(self, object_path):
1120
 
            for c in clients:
1121
 
                if c.dbus_object_path == object_path:
1122
 
                    c.stop()
1123
 
                    clients.remove(c)
1124
 
                    return
1125
 
            raise KeyError
1126
 
        
1127
 
        del _interface
1128
 
    
1129
 
    mandos_server = MandosServer()
1130
 
    
 
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
1131
349
    for client in clients:
1132
 
        # Emit D-Bus signal
1133
 
        mandos_server.ClientAdded(client.dbus_object_path,
1134
 
                                  client.GetAllProperties())
1135
 
        client.start()
1136
 
    
1137
 
    tcp_server.enable()
1138
 
    tcp_server.server_activate()
1139
 
    
1140
 
    # Find out what port we got
1141
 
    service.port = tcp_server.socket.getsockname()[1]
1142
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1143
 
                u" scope_id %d" % tcp_server.socket.getsockname())
1144
 
    
1145
 
    #service.interface = tcp_server.socket.getsockname()[3]
1146
 
    
1147
 
    try:
1148
 
        # From the Avahi example code
1149
 
        server.connect_to_signal("StateChanged", server_state_changed)
1150
 
        try:
1151
 
            server_state_changed(server.GetState())
1152
 
        except dbus.exceptions.DBusException, error:
1153
 
            logger.critical(u"DBusException: %s", error)
1154
 
            sys.exit(1)
1155
 
        # End of Avahi example code
1156
 
        
1157
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1158
 
                             lambda *args, **kwargs:
1159
 
                             (tcp_server.handle_request
1160
 
                              (*args[2:], **kwargs) or True))
1161
 
        
1162
 
        logger.debug(u"Starting main loop")
1163
 
        main_loop.run()
1164
 
    except AvahiError, error:
1165
 
        logger.critical(u"AvahiError: %s" + unicode(error))
1166
 
        sys.exit(1)
1167
 
    except KeyboardInterrupt:
1168
 
        if debug:
1169
 
            print
1170
 
 
1171
 
if __name__ == '__main__':
 
350
        client.stop_checker()
 
351
 
 
352
 
 
353
if __name__ == "__main__":
1172
354
    main()
 
355