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  • Committer: Björn Påhlsson
  • Date: 2008-07-20 03:51:41 UTC
  • Revision ID: belorn@braxen-20080720035141-ta0y0be7fotdm4ks
Fixed a overbufferflow bug, thanks to a forgotten \0

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#!/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", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
13
 
# Everything else is
14
 
# Copyright © 2008-2011 Teddy Hogeborn
15
 
# Copyright © 2008-2011 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@recompile.se>.
32
 
33
 
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
36
 
 
37
 
import SocketServer as socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
38
6
import socket
39
 
import argparse
 
7
import select
 
8
from optparse import OptionParser
40
9
import datetime
41
10
import errno
42
11
import gnutls.crypto
45
14
import gnutls.library.functions
46
15
import gnutls.library.constants
47
16
import gnutls.library.types
48
 
import ConfigParser as configparser
 
17
import ConfigParser
49
18
import sys
50
19
import re
51
20
import os
52
21
import signal
 
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
import contextlib
60
 
import struct
61
 
import fcntl
62
 
import functools
63
 
import cPickle as pickle
64
 
import multiprocessing
65
 
import types
66
 
import hashlib
67
24
 
68
25
import dbus
69
 
import dbus.service
70
26
import gobject
71
27
import avahi
72
28
from dbus.mainloop.glib import DBusGMainLoop
73
29
import ctypes
74
 
import ctypes.util
75
 
import xml.dom.minidom
76
 
import inspect
77
 
import Crypto.Cipher.AES
78
 
 
79
 
try:
80
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
81
 
except AttributeError:
82
 
    try:
83
 
        from IN import SO_BINDTODEVICE
84
 
    except ImportError:
85
 
        SO_BINDTODEVICE = None
86
 
 
87
 
 
88
 
version = "1.4.1"
89
 
 
90
 
logger = logging.getLogger()
91
 
stored_state_path = "/var/lib/mandos/clients.pickle"
92
 
 
93
 
syslogger = (logging.handlers.SysLogHandler
94
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
95
 
              address = str("/dev/log")))
96
 
syslogger.setFormatter(logging.Formatter
97
 
                       ('Mandos [%(process)d]: %(levelname)s:'
98
 
                        ' %(message)s'))
99
 
logger.addHandler(syslogger)
100
 
 
101
 
console = logging.StreamHandler()
102
 
console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
103
 
                                       ' [%(process)d]:'
104
 
                                       ' %(levelname)s:'
105
 
                                       ' %(message)s'))
106
 
logger.addHandler(console)
107
 
 
108
 
 
109
 
class AvahiError(Exception):
110
 
    def __init__(self, value, *args, **kwargs):
111
 
        self.value = value
112
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
113
 
    def __unicode__(self):
114
 
        return unicode(repr(self.value))
115
 
 
116
 
class AvahiServiceError(AvahiError):
117
 
    pass
118
 
 
119
 
class AvahiGroupError(AvahiError):
120
 
    pass
121
 
 
122
 
 
123
 
class AvahiService(object):
124
 
    """An Avahi (Zeroconf) service.
125
 
    
126
 
    Attributes:
127
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
128
 
               Used to optionally bind to the specified interface.
129
 
    name: string; Example: 'Mandos'
130
 
    type: string; Example: '_mandos._tcp'.
131
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
132
 
    port: integer; what port to announce
133
 
    TXT: list of strings; TXT record for the service
134
 
    domain: string; Domain to publish on, default to .local if empty.
135
 
    host: string; Host to publish records for, default is localhost
136
 
    max_renames: integer; maximum number of renames
137
 
    rename_count: integer; counter so we only rename after collisions
138
 
                  a sensible number of times
139
 
    group: D-Bus Entry Group
140
 
    server: D-Bus Server
141
 
    bus: dbus.SystemBus()
142
 
    """
143
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
144
 
                 servicetype = None, port = None, TXT = None,
145
 
                 domain = "", host = "", max_renames = 32768,
146
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
147
 
        self.interface = interface
148
 
        self.name = name
149
 
        self.type = servicetype
150
 
        self.port = port
151
 
        self.TXT = TXT if TXT is not None else []
152
 
        self.domain = domain
153
 
        self.host = host
154
 
        self.rename_count = 0
155
 
        self.max_renames = max_renames
156
 
        self.protocol = protocol
157
 
        self.group = None       # our entry group
158
 
        self.server = None
159
 
        self.bus = bus
160
 
        self.entry_group_state_changed_match = None
161
 
    def rename(self):
162
 
        """Derived from the Avahi example code"""
163
 
        if self.rename_count >= self.max_renames:
164
 
            logger.critical("No suitable Zeroconf service name found"
165
 
                            " after %i retries, exiting.",
166
 
                            self.rename_count)
167
 
            raise AvahiServiceError("Too many renames")
168
 
        self.name = unicode(self.server
169
 
                            .GetAlternativeServiceName(self.name))
170
 
        logger.info("Changing Zeroconf service name to %r ...",
171
 
                    self.name)
172
 
        self.remove()
173
 
        try:
174
 
            self.add()
175
 
        except dbus.exceptions.DBusException as error:
176
 
            logger.critical("DBusException: %s", error)
177
 
            self.cleanup()
178
 
            os._exit(1)
179
 
        self.rename_count += 1
180
 
    def remove(self):
181
 
        """Derived from the Avahi example code"""
182
 
        if self.entry_group_state_changed_match is not None:
183
 
            self.entry_group_state_changed_match.remove()
184
 
            self.entry_group_state_changed_match = None
185
 
        if self.group is not None:
186
 
            self.group.Reset()
187
 
    def add(self):
188
 
        """Derived from the Avahi example code"""
189
 
        self.remove()
190
 
        if self.group is None:
191
 
            self.group = dbus.Interface(
192
 
                self.bus.get_object(avahi.DBUS_NAME,
193
 
                                    self.server.EntryGroupNew()),
194
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
195
 
        self.entry_group_state_changed_match = (
196
 
            self.group.connect_to_signal(
197
 
                'StateChanged', self.entry_group_state_changed))
198
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
199
 
                     self.name, self.type)
200
 
        self.group.AddService(
201
 
            self.interface,
202
 
            self.protocol,
203
 
            dbus.UInt32(0),     # flags
204
 
            self.name, self.type,
205
 
            self.domain, self.host,
206
 
            dbus.UInt16(self.port),
207
 
            avahi.string_array_to_txt_array(self.TXT))
208
 
        self.group.Commit()
209
 
    def entry_group_state_changed(self, state, error):
210
 
        """Derived from the Avahi example code"""
211
 
        logger.debug("Avahi entry group state change: %i", state)
212
 
        
213
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
214
 
            logger.debug("Zeroconf service established.")
215
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
216
 
            logger.info("Zeroconf service name collision.")
217
 
            self.rename()
218
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
219
 
            logger.critical("Avahi: Error in group state changed %s",
220
 
                            unicode(error))
221
 
            raise AvahiGroupError("State changed: %s"
222
 
                                  % unicode(error))
223
 
    def cleanup(self):
224
 
        """Derived from the Avahi example code"""
225
 
        if self.group is not None:
226
 
            try:
227
 
                self.group.Free()
228
 
            except (dbus.exceptions.UnknownMethodException,
229
 
                    dbus.exceptions.DBusException) as e:
230
 
                pass
231
 
            self.group = None
232
 
        self.remove()
233
 
    def server_state_changed(self, state, error=None):
234
 
        """Derived from the Avahi example code"""
235
 
        logger.debug("Avahi server state change: %i", state)
236
 
        bad_states = { avahi.SERVER_INVALID:
237
 
                           "Zeroconf server invalid",
238
 
                       avahi.SERVER_REGISTERING: None,
239
 
                       avahi.SERVER_COLLISION:
240
 
                           "Zeroconf server name collision",
241
 
                       avahi.SERVER_FAILURE:
242
 
                           "Zeroconf server failure" }
243
 
        if state in bad_states:
244
 
            if bad_states[state] is not None:
245
 
                if error is None:
246
 
                    logger.error(bad_states[state])
247
 
                else:
248
 
                    logger.error(bad_states[state] + ": %r", error)
249
 
            self.cleanup()
250
 
        elif state == avahi.SERVER_RUNNING:
251
 
            self.add()
252
 
        else:
253
 
            if error is None:
254
 
                logger.debug("Unknown state: %r", state)
255
 
            else:
256
 
                logger.debug("Unknown state: %r: %r", state, error)
257
 
    def activate(self):
258
 
        """Derived from the Avahi example code"""
259
 
        if self.server is None:
260
 
            self.server = dbus.Interface(
261
 
                self.bus.get_object(avahi.DBUS_NAME,
262
 
                                    avahi.DBUS_PATH_SERVER,
263
 
                                    follow_name_owner_changes=True),
264
 
                avahi.DBUS_INTERFACE_SERVER)
265
 
        self.server.connect_to_signal("StateChanged",
266
 
                                 self.server_state_changed)
267
 
        self.server_state_changed(self.server.GetState())
268
 
 
269
 
class AvahiServiceToSyslog(AvahiService):
270
 
    def rename(self):
271
 
        """Add the new name to the syslog messages"""
272
 
        ret = AvahiService.rename(self)
273
 
        syslogger.setFormatter(logging.Formatter
274
 
                               ('Mandos (%s) [%%(process)d]:'
275
 
                                ' %%(levelname)s: %%(message)s'
276
 
                                % self.name))
277
 
        return ret
278
 
 
279
 
def _timedelta_to_milliseconds(td):
280
 
    "Convert a datetime.timedelta() to milliseconds"
281
 
    return ((td.days * 24 * 60 * 60 * 1000)
282
 
            + (td.seconds * 1000)
283
 
            + (td.microseconds // 1000))
284
 
        
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
 
36
logger = logging.Logger('mandos')
 
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
 
38
 
 
39
# This variable is used to optionally bind to a specified interface.
 
40
# It is a global variable to fit in with the other variables from the
 
41
# Avahi server example code.
 
42
serviceInterface = avahi.IF_UNSPEC
 
43
# From the Avahi server example code:
 
44
serviceName = "Mandos"
 
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
46
servicePort = None                      # Not known at startup
 
47
serviceTXT = []                         # TXT record for the service
 
48
domain = ""                  # Domain to publish on, default to .local
 
49
host = ""          # Host to publish records for, default to localhost
 
50
group = None #our entry group
 
51
rename_count = 12       # Counter so we only rename after collisions a
 
52
                        # sensible number of times
 
53
# End of Avahi example code
 
54
 
 
55
 
285
56
class Client(object):
286
57
    """A representation of a client host served by this server.
287
 
    
288
58
    Attributes:
289
 
    _approved:   bool(); 'None' if not yet approved/disapproved
290
 
    approval_delay: datetime.timedelta(); Time to wait for approval
291
 
    approval_duration: datetime.timedelta(); Duration of one approval
292
 
    checker:    subprocess.Popen(); a running checker process used
293
 
                                    to see if the client lives.
294
 
                                    'None' if no process is running.
295
 
    checker_callback_tag: a gobject event source tag, or None
296
 
    checker_command: string; External command which is run to check
297
 
                     if client lives.  %() expansions are done at
 
59
    name:      string; from the config file, used in log messages
 
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
61
                 uniquely identify the client
 
62
    secret:    bytestring; sent verbatim (over TLS) to client
 
63
    fqdn:      string (FQDN); available for use by the checker command
 
64
    created:   datetime.datetime()
 
65
    last_seen: datetime.datetime() or None if not yet seen
 
66
    timeout:   datetime.timedelta(); How long from last_seen until
 
67
                                     this client is invalid
 
68
    interval:  datetime.timedelta(); How often to start a new checker
 
69
    stop_hook: If set, called by stop() as stop_hook(self)
 
70
    checker:   subprocess.Popen(); a running checker process used
 
71
                                   to see if the client lives.
 
72
                                   Is None if no process is running.
 
73
    checker_initiator_tag: a gobject event source tag, or None
 
74
    stop_initiator_tag:    - '' -
 
75
    checker_callback_tag:  - '' -
 
76
    checker_command: string; External command which is run to check if
 
77
                     client lives.  %()s expansions are done at
298
78
                     runtime with vars(self) as dict, so that for
299
79
                     instance %(name)s can be used in the command.
300
 
    checker_initiator_tag: a gobject event source tag, or None
301
 
    created:    datetime.datetime(); (UTC) object creation
302
 
    client_structure: Object describing what attributes a client has
303
 
                      and is used for storing the client at exit
304
 
    current_checker_command: string; current running checker_command
305
 
    disable_initiator_tag: a gobject event source tag, or None
306
 
    enabled:    bool()
307
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
308
 
                 uniquely identify the client
309
 
    host:       string; available for use by the checker command
310
 
    interval:   datetime.timedelta(); How often to start a new checker
311
 
    last_approval_request: datetime.datetime(); (UTC) or None
312
 
    last_checked_ok: datetime.datetime(); (UTC) or None
313
 
    last_checker_status: integer between 0 and 255 reflecting exit status
314
 
                         of last checker. -1 reflect crashed checker,
315
 
                         or None.
316
 
    last_enabled: datetime.datetime(); (UTC)
317
 
    name:       string; from the config file, used in log messages and
318
 
                        D-Bus identifiers
319
 
    secret:     bytestring; sent verbatim (over TLS) to client
320
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
321
 
                                      until this client is disabled
322
 
    extended_timeout:   extra long timeout when password has been sent
323
 
    runtime_expansions: Allowed attributes for runtime expansion.
324
 
    expires:    datetime.datetime(); time (UTC) when a client will be
325
 
                disabled, or None
 
80
    Private attibutes:
 
81
    _timeout: Real variable for 'timeout'
 
82
    _interval: Real variable for 'interval'
 
83
    _timeout_milliseconds: Used by gobject.timeout_add()
 
84
    _interval_milliseconds: - '' -
326
85
    """
327
 
    
328
 
    runtime_expansions = ("approval_delay", "approval_duration",
329
 
                          "created", "enabled", "fingerprint",
330
 
                          "host", "interval", "last_checked_ok",
331
 
                          "last_enabled", "name", "timeout")
332
 
    
333
 
    def timeout_milliseconds(self):
334
 
        "Return the 'timeout' attribute in milliseconds"
335
 
        return _timedelta_to_milliseconds(self.timeout)
336
 
    
337
 
    def extended_timeout_milliseconds(self):
338
 
        "Return the 'extended_timeout' attribute in milliseconds"
339
 
        return _timedelta_to_milliseconds(self.extended_timeout)
340
 
    
341
 
    def interval_milliseconds(self):
342
 
        "Return the 'interval' attribute in milliseconds"
343
 
        return _timedelta_to_milliseconds(self.interval)
344
 
    
345
 
    def approval_delay_milliseconds(self):
346
 
        return _timedelta_to_milliseconds(self.approval_delay)
347
 
    
348
 
    def __init__(self, name = None, config=None):
349
 
        """Note: the 'checker' key in 'config' sets the
350
 
        'checker_command' attribute and *not* the 'checker'
351
 
        attribute."""
 
86
    def _set_timeout(self, timeout):
 
87
        "Setter function for 'timeout' attribute"
 
88
        self._timeout = timeout
 
89
        self._timeout_milliseconds = ((self.timeout.days
 
90
                                       * 24 * 60 * 60 * 1000)
 
91
                                      + (self.timeout.seconds * 1000)
 
92
                                      + (self.timeout.microseconds
 
93
                                         // 1000))
 
94
    timeout = property(lambda self: self._timeout,
 
95
                       _set_timeout)
 
96
    del _set_timeout
 
97
    def _set_interval(self, interval):
 
98
        "Setter function for 'interval' attribute"
 
99
        self._interval = interval
 
100
        self._interval_milliseconds = ((self.interval.days
 
101
                                        * 24 * 60 * 60 * 1000)
 
102
                                       + (self.interval.seconds
 
103
                                          * 1000)
 
104
                                       + (self.interval.microseconds
 
105
                                          // 1000))
 
106
    interval = property(lambda self: self._interval,
 
107
                        _set_interval)
 
108
    del _set_interval
 
109
    def __init__(self, name=None, options=None, stop_hook=None,
 
110
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
111
                 timeout=None, interval=-1, checker=None):
352
112
        self.name = name
353
 
        if config is None:
354
 
            config = {}
355
 
        logger.debug("Creating client %r", self.name)
356
 
        # Uppercase and remove spaces from fingerprint for later
357
 
        # comparison purposes with return value from the fingerprint()
358
 
        # function
359
 
        self.fingerprint = (config["fingerprint"].upper()
360
 
                            .replace(" ", ""))
361
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
362
 
        if "secret" in config:
363
 
            self.secret = config["secret"].decode("base64")
364
 
        elif "secfile" in config:
365
 
            with open(os.path.expanduser(os.path.expandvars
366
 
                                         (config["secfile"])),
367
 
                      "rb") as secfile:
368
 
                self.secret = secfile.read()
369
 
        else:
370
 
            raise TypeError("No secret or secfile for client %s"
371
 
                            % self.name)
372
 
        self.host = config.get("host", "")
373
 
        self.created = datetime.datetime.utcnow()
374
 
        self.enabled = True
375
 
        self.last_approval_request = None
376
 
        self.last_enabled = datetime.datetime.utcnow()
377
 
        self.last_checked_ok = None
378
 
        self.last_checker_status = None
379
 
        self.timeout = string_to_delta(config["timeout"])
380
 
        self.extended_timeout = string_to_delta(config
381
 
                                                ["extended_timeout"])
382
 
        self.interval = string_to_delta(config["interval"])
 
113
        # Uppercase and remove spaces from fingerprint
 
114
        # for later comparison purposes with return value of
 
115
        # the fingerprint() function
 
116
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
117
        if secret:
 
118
            self.secret = secret.decode(u"base64")
 
119
        elif secfile:
 
120
            sf = open(secfile)
 
121
            self.secret = sf.read()
 
122
            sf.close()
 
123
        else:
 
124
            raise RuntimeError(u"No secret or secfile for client %s"
 
125
                               % self.name)
 
126
        self.fqdn = fqdn                # string
 
127
        self.created = datetime.datetime.now()
 
128
        self.last_seen = None
 
129
        if timeout is None:
 
130
            timeout = options.timeout
 
131
        self.timeout = timeout
 
132
        if interval == -1:
 
133
            interval = options.interval
 
134
        else:
 
135
            interval = string_to_delta(interval)
 
136
        self.interval = interval
 
137
        self.stop_hook = stop_hook
383
138
        self.checker = None
384
139
        self.checker_initiator_tag = None
385
 
        self.disable_initiator_tag = None
386
 
        self.expires = datetime.datetime.utcnow() + self.timeout
 
140
        self.stop_initiator_tag = None
387
141
        self.checker_callback_tag = None
388
 
        self.checker_command = config["checker"]
389
 
        self.current_checker_command = None
390
 
        self._approved = None
391
 
        self.approved_by_default = config.get("approved_by_default",
392
 
                                              True)
393
 
        self.approvals_pending = 0
394
 
        self.approval_delay = string_to_delta(
395
 
            config["approval_delay"])
396
 
        self.approval_duration = string_to_delta(
397
 
            config["approval_duration"])
398
 
        self.changedstate = (multiprocessing_manager
399
 
                             .Condition(multiprocessing_manager
400
 
                                        .Lock()))
401
 
        self.client_structure = [attr for attr in self.__dict__.iterkeys() if not attr.startswith("_")]
402
 
        self.client_structure.append("client_structure")
403
 
 
404
 
 
405
 
        for name, t in inspect.getmembers(type(self),
406
 
                                          lambda obj: isinstance(obj, property)):
407
 
            if not name.startswith("_"):
408
 
                self.client_structure.append(name)
409
 
    
410
 
    # Send notice to process children that client state has changed
411
 
    def send_changedstate(self):
412
 
        with self.changedstate:
413
 
            self.changedstate.notify_all()
414
 
    
415
 
    def enable(self):
416
 
        """Start this client's checker and timeout hooks"""
417
 
        if getattr(self, "enabled", False):
418
 
            # Already enabled
419
 
            return
420
 
        self.send_changedstate()
421
 
        self.expires = datetime.datetime.utcnow() + self.timeout
422
 
        self.enabled = True
423
 
        self.last_enabled = datetime.datetime.utcnow()
424
 
        self.init_checker()
425
 
    
426
 
    def disable(self, quiet=True):
427
 
        """Disable this client."""
428
 
        if not getattr(self, "enabled", False):
429
 
            return False
430
 
        if not quiet:
431
 
            self.send_changedstate()
432
 
        if not quiet:
433
 
            logger.info("Disabling client %s", self.name)
434
 
        if getattr(self, "disable_initiator_tag", False):
435
 
            gobject.source_remove(self.disable_initiator_tag)
436
 
            self.disable_initiator_tag = None
437
 
        self.expires = None
438
 
        if getattr(self, "checker_initiator_tag", False):
439
 
            gobject.source_remove(self.checker_initiator_tag)
440
 
            self.checker_initiator_tag = None
441
 
        self.stop_checker()
442
 
        self.enabled = False
443
 
        # Do not run this again if called by a gobject.timeout_add
444
 
        return False
445
 
    
446
 
    def __del__(self):
447
 
        self.disable()
448
 
 
449
 
    def init_checker(self):
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
450
145
        # Schedule a new checker to be started an 'interval' from now,
451
146
        # and every interval from then on.
452
 
        self.checker_initiator_tag = (gobject.timeout_add
453
 
                                      (self.interval_milliseconds(),
454
 
                                       self.start_checker))
455
 
        # Schedule a disable() when 'timeout' has passed
456
 
        self.disable_initiator_tag = (gobject.timeout_add
457
 
                                   (self.timeout_milliseconds(),
458
 
                                    self.disable))
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
459
150
        # Also start a new checker *right now*.
460
151
        self.start_checker()
461
 
 
462
 
        
463
 
    def checker_callback(self, pid, condition, command):
 
152
        # Schedule a stop() when 'timeout' has passed
 
153
        self.stop_initiator_tag = gobject.timeout_add\
 
154
                                  (self._timeout_milliseconds,
 
155
                                   self.stop)
 
156
    def stop(self):
 
157
        """Stop this client.
 
158
        The possibility that this client might be restarted is left
 
159
        open, but not currently used."""
 
160
        logger.debug(u"Stopping client %s", self.name)
 
161
        self.secret = None
 
162
        if self.stop_initiator_tag:
 
163
            gobject.source_remove(self.stop_initiator_tag)
 
164
            self.stop_initiator_tag = None
 
165
        if self.checker_initiator_tag:
 
166
            gobject.source_remove(self.checker_initiator_tag)
 
167
            self.checker_initiator_tag = None
 
168
        self.stop_checker()
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
 
171
        # Do not run this again if called by a gobject.timeout_add
 
172
        return False
 
173
    def __del__(self):
 
174
        # Some code duplication here and in stop()
 
175
        if hasattr(self, "stop_initiator_tag") \
 
176
               and self.stop_initiator_tag:
 
177
            gobject.source_remove(self.stop_initiator_tag)
 
178
            self.stop_initiator_tag = None
 
179
        if hasattr(self, "checker_initiator_tag") \
 
180
               and self.checker_initiator_tag:
 
181
            gobject.source_remove(self.checker_initiator_tag)
 
182
            self.checker_initiator_tag = None
 
183
        self.stop_checker()
 
184
    def checker_callback(self, pid, condition):
464
185
        """The checker has completed, so take appropriate actions."""
465
 
        self.checker_callback_tag = None
466
 
        self.checker = None
467
 
        if os.WIFEXITED(condition):
468
 
            self.last_checker_status =  os.WEXITSTATUS(condition)
469
 
            if self.last_checker_status == 0:
470
 
                logger.info("Checker for %(name)s succeeded",
471
 
                            vars(self))
472
 
                self.checked_ok()
473
 
            else:
474
 
                logger.info("Checker for %(name)s failed",
475
 
                            vars(self))
476
 
        else:
477
 
            self.last_checker_status = -1
478
 
            logger.warning("Checker for %(name)s crashed?",
 
186
        now = datetime.datetime.now()
 
187
        if os.WIFEXITED(condition) \
 
188
               and (os.WEXITSTATUS(condition) == 0):
 
189
            logger.debug(u"Checker for %(name)s succeeded",
 
190
                         vars(self))
 
191
            self.last_seen = now
 
192
            gobject.source_remove(self.stop_initiator_tag)
 
193
            self.stop_initiator_tag = gobject.timeout_add\
 
194
                                      (self._timeout_milliseconds,
 
195
                                       self.stop)
 
196
        if not os.WIFEXITED(condition):
 
197
            logger.warning(u"Checker for %(name)s crashed?",
479
198
                           vars(self))
480
 
    
481
 
    def checked_ok(self, timeout=None):
482
 
        """Bump up the timeout for this client.
483
 
        
484
 
        This should only be called when the client has been seen,
485
 
        alive and well.
486
 
        """
487
 
        if timeout is None:
488
 
            timeout = self.timeout
489
 
        self.last_checked_ok = datetime.datetime.utcnow()
490
 
        if self.disable_initiator_tag is not None:
491
 
            gobject.source_remove(self.disable_initiator_tag)
492
 
        if getattr(self, "enabled", False):
493
 
            self.disable_initiator_tag = (gobject.timeout_add
494
 
                                          (_timedelta_to_milliseconds
495
 
                                           (timeout), self.disable))
496
 
            self.expires = datetime.datetime.utcnow() + timeout
497
 
    
498
 
    def need_approval(self):
499
 
        self.last_approval_request = datetime.datetime.utcnow()
500
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
501
204
    def start_checker(self):
502
205
        """Start a new checker subprocess if one is not running.
503
 
        
504
206
        If a checker already exists, leave it running and do
505
207
        nothing."""
506
 
        # The reason for not killing a running checker is that if we
507
 
        # did that, then if a checker (for some reason) started
508
 
        # running slowly and taking more than 'interval' time, the
509
 
        # client would inevitably timeout, since no checker would get
510
 
        # a chance to run to completion.  If we instead leave running
511
 
        # checkers alone, the checker would have to take more time
512
 
        # than 'timeout' for the client to be disabled, which is as it
513
 
        # should be.
514
 
        
515
 
        # If a checker exists, make sure it is not a zombie
516
 
        try:
517
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
518
 
        except (AttributeError, OSError) as error:
519
 
            if (isinstance(error, OSError)
520
 
                and error.errno != errno.ECHILD):
521
 
                raise error
522
 
        else:
523
 
            if pid:
524
 
                logger.warning("Checker was a zombie")
525
 
                gobject.source_remove(self.checker_callback_tag)
526
 
                self.checker_callback(pid, status,
527
 
                                      self.current_checker_command)
528
 
        # Start a new checker if needed
529
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
530
211
            try:
531
 
                # In case checker_command has exactly one % operator
532
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
533
213
            except TypeError:
534
 
                # Escape attributes for the shell
535
 
                escaped_attrs = dict(
536
 
                    (attr,
537
 
                     re.escape(unicode(str(getattr(self, attr, "")),
538
 
                                       errors=
539
 
                                       'replace')))
540
 
                    for attr in
541
 
                    self.runtime_expansions)
542
 
                
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
543
217
                try:
544
 
                    command = self.checker_command % escaped_attrs
545
 
                except TypeError as error:
546
 
                    logger.error('Could not format string "%s":'
547
 
                                 ' %s', self.checker_command, error)
 
218
                    command = self.check_command % escaped_attrs
 
219
                except TypeError, error:
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
548
222
                    return True # Try again later
549
 
            self.current_checker_command = command
550
223
            try:
551
 
                logger.info("Starting checker %r for %s",
552
 
                            command, self.name)
553
 
                # We don't need to redirect stdout and stderr, since
554
 
                # in normal mode, that is already done by daemon(),
555
 
                # and in debug mode we don't want to.  (Stdin is
556
 
                # always replaced by /dev/null.)
557
 
                self.checker = subprocess.Popen(command,
558
 
                                                close_fds=True,
559
 
                                                shell=True, cwd="/")
560
 
                self.checker_callback_tag = (gobject.child_watch_add
561
 
                                             (self.checker.pid,
562
 
                                              self.checker_callback,
563
 
                                              data=command))
564
 
                # The checker may have completed before the gobject
565
 
                # watch was added.  Check for this.
566
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
567
 
                if pid:
568
 
                    gobject.source_remove(self.checker_callback_tag)
569
 
                    self.checker_callback(pid, status, command)
570
 
            except OSError as error:
571
 
                logger.error("Failed to start subprocess: %s",
 
224
                self.checker = subprocess.\
 
225
                               Popen(command,
 
226
                                     stdout=subprocess.PIPE,
 
227
                                     close_fds=True, shell=True,
 
228
                                     cwd="/")
 
229
                self.checker_callback_tag = gobject.\
 
230
                                            child_watch_add(self.checker.pid,
 
231
                                                            self.\
 
232
                                                            checker_callback)
 
233
            except subprocess.OSError, error:
 
234
                logger.error(u"Failed to start subprocess: %s",
572
235
                             error)
573
236
        # Re-run this periodically if run by gobject.timeout_add
574
237
        return True
575
 
    
576
238
    def stop_checker(self):
577
239
        """Force the checker process, if any, to stop."""
578
 
        if self.checker_callback_tag:
579
 
            gobject.source_remove(self.checker_callback_tag)
580
 
            self.checker_callback_tag = None
581
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
582
241
            return
583
 
        logger.debug("Stopping checker for %(name)s", vars(self))
584
 
        try:
585
 
            os.kill(self.checker.pid, signal.SIGTERM)
586
 
            #time.sleep(0.5)
587
 
            #if self.checker.poll() is None:
588
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
589
 
        except OSError as error:
590
 
            if error.errno != errno.ESRCH: # No such process
591
 
                raise
592
 
        self.checker = None
593
 
 
594
 
    # Encrypts a client secret and stores it in a varible encrypted_secret
595
 
    def encrypt_secret(self, key):
596
 
        # Encryption-key need to be of a specific size, so we hash inputed key
597
 
        hasheng = hashlib.sha256()
598
 
        hasheng.update(key)
599
 
        encryptionkey = hasheng.digest()
600
 
 
601
 
        # Create validation hash so we know at decryption if it was sucessful
602
 
        hasheng = hashlib.sha256()
603
 
        hasheng.update(self.secret)
604
 
        validationhash = hasheng.digest()
605
 
 
606
 
        # Encrypt secret
607
 
        iv = os.urandom(Crypto.Cipher.AES.block_size)
608
 
        ciphereng = Crypto.Cipher.AES.new(encryptionkey,
609
 
                                        Crypto.Cipher.AES.MODE_CFB, iv)
610
 
        ciphertext = ciphereng.encrypt(validationhash+self.secret)
611
 
        self.encrypted_secret = (ciphertext, iv)
612
 
 
613
 
    # Decrypt a encrypted client secret
614
 
    def decrypt_secret(self, key):
615
 
        # Decryption-key need to be of a specific size, so we hash inputed key
616
 
        hasheng = hashlib.sha256()
617
 
        hasheng.update(key)
618
 
        encryptionkey = hasheng.digest()
619
 
 
620
 
        # Decrypt encrypted secret
621
 
        ciphertext, iv = self.encrypted_secret
622
 
        ciphereng = Crypto.Cipher.AES.new(encryptionkey,
623
 
                                        Crypto.Cipher.AES.MODE_CFB, iv)
624
 
        plain = ciphereng.decrypt(ciphertext)
625
 
 
626
 
        # Validate decrypted secret to know if it was succesful
627
 
        hasheng = hashlib.sha256()
628
 
        validationhash = plain[:hasheng.digest_size]
629
 
        secret = plain[hasheng.digest_size:]
630
 
        hasheng.update(secret)
631
 
 
632
 
        # if validation fails, we use key as new secret. Otherwhise, we use
633
 
        # the decrypted secret
634
 
        if hasheng.digest() == validationhash:
635
 
            self.secret = secret
636
 
        else:
637
 
            self.secret = key
638
 
        del self.encrypted_secret
639
 
 
640
 
 
641
 
def dbus_service_property(dbus_interface, signature="v",
642
 
                          access="readwrite", byte_arrays=False):
643
 
    """Decorators for marking methods of a DBusObjectWithProperties to
644
 
    become properties on the D-Bus.
645
 
    
646
 
    The decorated method will be called with no arguments by "Get"
647
 
    and with one argument by "Set".
648
 
    
649
 
    The parameters, where they are supported, are the same as
650
 
    dbus.service.method, except there is only "signature", since the
651
 
    type from Get() and the type sent to Set() is the same.
652
 
    """
653
 
    # Encoding deeply encoded byte arrays is not supported yet by the
654
 
    # "Set" method, so we fail early here:
655
 
    if byte_arrays and signature != "ay":
656
 
        raise ValueError("Byte arrays not supported for non-'ay'"
657
 
                         " signature %r" % signature)
658
 
    def decorator(func):
659
 
        func._dbus_is_property = True
660
 
        func._dbus_interface = dbus_interface
661
 
        func._dbus_signature = signature
662
 
        func._dbus_access = access
663
 
        func._dbus_name = func.__name__
664
 
        if func._dbus_name.endswith("_dbus_property"):
665
 
            func._dbus_name = func._dbus_name[:-14]
666
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
667
 
        return func
668
 
    return decorator
669
 
 
670
 
 
671
 
class DBusPropertyException(dbus.exceptions.DBusException):
672
 
    """A base class for D-Bus property-related exceptions
673
 
    """
674
 
    def __unicode__(self):
675
 
        return unicode(str(self))
676
 
 
677
 
 
678
 
class DBusPropertyAccessException(DBusPropertyException):
679
 
    """A property's access permissions disallows an operation.
680
 
    """
681
 
    pass
682
 
 
683
 
 
684
 
class DBusPropertyNotFound(DBusPropertyException):
685
 
    """An attempt was made to access a non-existing property.
686
 
    """
687
 
    pass
688
 
 
689
 
 
690
 
class DBusObjectWithProperties(dbus.service.Object):
691
 
    """A D-Bus object with properties.
692
 
    
693
 
    Classes inheriting from this can use the dbus_service_property
694
 
    decorator to expose methods as D-Bus properties.  It exposes the
695
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
696
 
    """
697
 
    
698
 
    @staticmethod
699
 
    def _is_dbus_property(obj):
700
 
        return getattr(obj, "_dbus_is_property", False)
701
 
    
702
 
    def _get_all_dbus_properties(self):
703
 
        """Returns a generator of (name, attribute) pairs
704
 
        """
705
 
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
706
 
                for cls in self.__class__.__mro__
707
 
                for name, prop in
708
 
                inspect.getmembers(cls, self._is_dbus_property))
709
 
    
710
 
    def _get_dbus_property(self, interface_name, property_name):
711
 
        """Returns a bound method if one exists which is a D-Bus
712
 
        property with the specified name and interface.
713
 
        """
714
 
        for cls in  self.__class__.__mro__:
715
 
            for name, value in (inspect.getmembers
716
 
                                (cls, self._is_dbus_property)):
717
 
                if (value._dbus_name == property_name
718
 
                    and value._dbus_interface == interface_name):
719
 
                    return value.__get__(self)
720
 
        
721
 
        # No such property
722
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
723
 
                                   + interface_name + "."
724
 
                                   + property_name)
725
 
    
726
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
727
 
                         out_signature="v")
728
 
    def Get(self, interface_name, property_name):
729
 
        """Standard D-Bus property Get() method, see D-Bus standard.
730
 
        """
731
 
        prop = self._get_dbus_property(interface_name, property_name)
732
 
        if prop._dbus_access == "write":
733
 
            raise DBusPropertyAccessException(property_name)
734
 
        value = prop()
735
 
        if not hasattr(value, "variant_level"):
736
 
            return value
737
 
        return type(value)(value, variant_level=value.variant_level+1)
738
 
    
739
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
740
 
    def Set(self, interface_name, property_name, value):
741
 
        """Standard D-Bus property Set() method, see D-Bus standard.
742
 
        """
743
 
        prop = self._get_dbus_property(interface_name, property_name)
744
 
        if prop._dbus_access == "read":
745
 
            raise DBusPropertyAccessException(property_name)
746
 
        if prop._dbus_get_args_options["byte_arrays"]:
747
 
            # The byte_arrays option is not supported yet on
748
 
            # signatures other than "ay".
749
 
            if prop._dbus_signature != "ay":
750
 
                raise ValueError
751
 
            value = dbus.ByteArray(''.join(unichr(byte)
752
 
                                           for byte in value))
753
 
        prop(value)
754
 
    
755
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
756
 
                         out_signature="a{sv}")
757
 
    def GetAll(self, interface_name):
758
 
        """Standard D-Bus property GetAll() method, see D-Bus
759
 
        standard.
760
 
        
761
 
        Note: Will not include properties with access="write".
762
 
        """
763
 
        all = {}
764
 
        for name, prop in self._get_all_dbus_properties():
765
 
            if (interface_name
766
 
                and interface_name != prop._dbus_interface):
767
 
                # Interface non-empty but did not match
768
 
                continue
769
 
            # Ignore write-only properties
770
 
            if prop._dbus_access == "write":
771
 
                continue
772
 
            value = prop()
773
 
            if not hasattr(value, "variant_level"):
774
 
                all[name] = value
775
 
                continue
776
 
            all[name] = type(value)(value, variant_level=
777
 
                                    value.variant_level+1)
778
 
        return dbus.Dictionary(all, signature="sv")
779
 
    
780
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
781
 
                         out_signature="s",
782
 
                         path_keyword='object_path',
783
 
                         connection_keyword='connection')
784
 
    def Introspect(self, object_path, connection):
785
 
        """Standard D-Bus method, overloaded to insert property tags.
786
 
        """
787
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
788
 
                                                   connection)
789
 
        try:
790
 
            document = xml.dom.minidom.parseString(xmlstring)
791
 
            def make_tag(document, name, prop):
792
 
                e = document.createElement("property")
793
 
                e.setAttribute("name", name)
794
 
                e.setAttribute("type", prop._dbus_signature)
795
 
                e.setAttribute("access", prop._dbus_access)
796
 
                return e
797
 
            for if_tag in document.getElementsByTagName("interface"):
798
 
                for tag in (make_tag(document, name, prop)
799
 
                            for name, prop
800
 
                            in self._get_all_dbus_properties()
801
 
                            if prop._dbus_interface
802
 
                            == if_tag.getAttribute("name")):
803
 
                    if_tag.appendChild(tag)
804
 
                # Add the names to the return values for the
805
 
                # "org.freedesktop.DBus.Properties" methods
806
 
                if (if_tag.getAttribute("name")
807
 
                    == "org.freedesktop.DBus.Properties"):
808
 
                    for cn in if_tag.getElementsByTagName("method"):
809
 
                        if cn.getAttribute("name") == "Get":
810
 
                            for arg in cn.getElementsByTagName("arg"):
811
 
                                if (arg.getAttribute("direction")
812
 
                                    == "out"):
813
 
                                    arg.setAttribute("name", "value")
814
 
                        elif cn.getAttribute("name") == "GetAll":
815
 
                            for arg in cn.getElementsByTagName("arg"):
816
 
                                if (arg.getAttribute("direction")
817
 
                                    == "out"):
818
 
                                    arg.setAttribute("name", "props")
819
 
            xmlstring = document.toxml("utf-8")
820
 
            document.unlink()
821
 
        except (AttributeError, xml.dom.DOMException,
822
 
                xml.parsers.expat.ExpatError) as error:
823
 
            logger.error("Failed to override Introspection method",
824
 
                         error)
825
 
        return xmlstring
826
 
 
827
 
 
828
 
def datetime_to_dbus (dt, variant_level=0):
829
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
830
 
    if dt is None:
831
 
        return dbus.String("", variant_level = variant_level)
832
 
    return dbus.String(dt.isoformat(),
833
 
                       variant_level=variant_level)
834
 
 
835
 
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
836
 
                                  .__metaclass__):
837
 
    """Applied to an empty subclass of a D-Bus object, this metaclass
838
 
    will add additional D-Bus attributes matching a certain pattern.
839
 
    """
840
 
    def __new__(mcs, name, bases, attr):
841
 
        # Go through all the base classes which could have D-Bus
842
 
        # methods, signals, or properties in them
843
 
        for base in (b for b in bases
844
 
                     if issubclass(b, dbus.service.Object)):
845
 
            # Go though all attributes of the base class
846
 
            for attrname, attribute in inspect.getmembers(base):
847
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
848
 
                # with the wrong interface name
849
 
                if (not hasattr(attribute, "_dbus_interface")
850
 
                    or not attribute._dbus_interface
851
 
                    .startswith("se.recompile.Mandos")):
852
 
                    continue
853
 
                # Create an alternate D-Bus interface name based on
854
 
                # the current name
855
 
                alt_interface = (attribute._dbus_interface
856
 
                                 .replace("se.recompile.Mandos",
857
 
                                          "se.bsnet.fukt.Mandos"))
858
 
                # Is this a D-Bus signal?
859
 
                if getattr(attribute, "_dbus_is_signal", False):
860
 
                    # Extract the original non-method function by
861
 
                    # black magic
862
 
                    nonmethod_func = (dict(
863
 
                            zip(attribute.func_code.co_freevars,
864
 
                                attribute.__closure__))["func"]
865
 
                                      .cell_contents)
866
 
                    # Create a new, but exactly alike, function
867
 
                    # object, and decorate it to be a new D-Bus signal
868
 
                    # with the alternate D-Bus interface name
869
 
                    new_function = (dbus.service.signal
870
 
                                    (alt_interface,
871
 
                                     attribute._dbus_signature)
872
 
                                    (types.FunctionType(
873
 
                                nonmethod_func.func_code,
874
 
                                nonmethod_func.func_globals,
875
 
                                nonmethod_func.func_name,
876
 
                                nonmethod_func.func_defaults,
877
 
                                nonmethod_func.func_closure)))
878
 
                    # Define a creator of a function to call both the
879
 
                    # old and new functions, so both the old and new
880
 
                    # signals gets sent when the function is called
881
 
                    def fixscope(func1, func2):
882
 
                        """This function is a scope container to pass
883
 
                        func1 and func2 to the "call_both" function
884
 
                        outside of its arguments"""
885
 
                        def call_both(*args, **kwargs):
886
 
                            """This function will emit two D-Bus
887
 
                            signals by calling func1 and func2"""
888
 
                            func1(*args, **kwargs)
889
 
                            func2(*args, **kwargs)
890
 
                        return call_both
891
 
                    # Create the "call_both" function and add it to
892
 
                    # the class
893
 
                    attr[attrname] = fixscope(attribute,
894
 
                                              new_function)
895
 
                # Is this a D-Bus method?
896
 
                elif getattr(attribute, "_dbus_is_method", False):
897
 
                    # Create a new, but exactly alike, function
898
 
                    # object.  Decorate it to be a new D-Bus method
899
 
                    # with the alternate D-Bus interface name.  Add it
900
 
                    # to the class.
901
 
                    attr[attrname] = (dbus.service.method
902
 
                                      (alt_interface,
903
 
                                       attribute._dbus_in_signature,
904
 
                                       attribute._dbus_out_signature)
905
 
                                      (types.FunctionType
906
 
                                       (attribute.func_code,
907
 
                                        attribute.func_globals,
908
 
                                        attribute.func_name,
909
 
                                        attribute.func_defaults,
910
 
                                        attribute.func_closure)))
911
 
                # Is this a D-Bus property?
912
 
                elif getattr(attribute, "_dbus_is_property", False):
913
 
                    # Create a new, but exactly alike, function
914
 
                    # object, and decorate it to be a new D-Bus
915
 
                    # property with the alternate D-Bus interface
916
 
                    # name.  Add it to the class.
917
 
                    attr[attrname] = (dbus_service_property
918
 
                                      (alt_interface,
919
 
                                       attribute._dbus_signature,
920
 
                                       attribute._dbus_access,
921
 
                                       attribute
922
 
                                       ._dbus_get_args_options
923
 
                                       ["byte_arrays"])
924
 
                                      (types.FunctionType
925
 
                                       (attribute.func_code,
926
 
                                        attribute.func_globals,
927
 
                                        attribute.func_name,
928
 
                                        attribute.func_defaults,
929
 
                                        attribute.func_closure)))
930
 
        return type.__new__(mcs, name, bases, attr)
931
 
 
932
 
class ClientDBus(Client, DBusObjectWithProperties):
933
 
    """A Client class using D-Bus
934
 
    
935
 
    Attributes:
936
 
    dbus_object_path: dbus.ObjectPath
937
 
    bus: dbus.SystemBus()
938
 
    """
939
 
    
940
 
    runtime_expansions = (Client.runtime_expansions
941
 
                          + ("dbus_object_path",))
942
 
    
943
 
    # dbus.service.Object doesn't use super(), so we can't either.
944
 
    
945
 
    def __init__(self, bus = None, *args, **kwargs):
946
 
        self.bus = bus
947
 
        Client.__init__(self, *args, **kwargs)
948
 
 
949
 
        self._approvals_pending = 0
950
 
        # Only now, when this client is initialized, can it show up on
951
 
        # the D-Bus
952
 
        client_object_name = unicode(self.name).translate(
953
 
            {ord("."): ord("_"),
954
 
             ord("-"): ord("_")})
955
 
        self.dbus_object_path = (dbus.ObjectPath
956
 
                                 ("/clients/" + client_object_name))
957
 
        DBusObjectWithProperties.__init__(self, self.bus,
958
 
                                          self.dbus_object_path)
959
 
        
960
 
    def notifychangeproperty(transform_func,
961
 
                             dbus_name, type_func=lambda x: x,
962
 
                             variant_level=1):
963
 
        """ Modify a variable so that it's a property which announces
964
 
        its changes to DBus.
965
 
 
966
 
        transform_fun: Function that takes a value and a variant_level
967
 
                       and transforms it to a D-Bus type.
968
 
        dbus_name: D-Bus name of the variable
969
 
        type_func: Function that transform the value before sending it
970
 
                   to the D-Bus.  Default: no transform
971
 
        variant_level: D-Bus variant level.  Default: 1
972
 
        """
973
 
        attrname = "_{0}".format(dbus_name)
974
 
        def setter(self, value):
975
 
            if hasattr(self, "dbus_object_path"):
976
 
                if (not hasattr(self, attrname) or
977
 
                    type_func(getattr(self, attrname, None))
978
 
                    != type_func(value)):
979
 
                    dbus_value = transform_func(type_func(value),
980
 
                                                variant_level
981
 
                                                =variant_level)
982
 
                    self.PropertyChanged(dbus.String(dbus_name),
983
 
                                         dbus_value)
984
 
            setattr(self, attrname, value)
985
 
        
986
 
        return property(lambda self: getattr(self, attrname), setter)
987
 
    
988
 
    
989
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
990
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
991
 
                                             "ApprovalPending",
992
 
                                             type_func = bool)
993
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
994
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
995
 
                                        "LastEnabled")
996
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
997
 
                                   type_func = lambda checker:
998
 
                                       checker is not None)
999
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1000
 
                                           "LastCheckedOK")
1001
 
    last_approval_request = notifychangeproperty(
1002
 
        datetime_to_dbus, "LastApprovalRequest")
1003
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1004
 
                                               "ApprovedByDefault")
1005
 
    approval_delay = notifychangeproperty(dbus.UInt16,
1006
 
                                          "ApprovalDelay",
1007
 
                                          type_func =
1008
 
                                          _timedelta_to_milliseconds)
1009
 
    approval_duration = notifychangeproperty(
1010
 
        dbus.UInt16, "ApprovalDuration",
1011
 
        type_func = _timedelta_to_milliseconds)
1012
 
    host = notifychangeproperty(dbus.String, "Host")
1013
 
    timeout = notifychangeproperty(dbus.UInt16, "Timeout",
1014
 
                                   type_func =
1015
 
                                   _timedelta_to_milliseconds)
1016
 
    extended_timeout = notifychangeproperty(
1017
 
        dbus.UInt16, "ExtendedTimeout",
1018
 
        type_func = _timedelta_to_milliseconds)
1019
 
    interval = notifychangeproperty(dbus.UInt16,
1020
 
                                    "Interval",
1021
 
                                    type_func =
1022
 
                                    _timedelta_to_milliseconds)
1023
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1024
 
    
1025
 
    del notifychangeproperty
1026
 
    
1027
 
    def __del__(self, *args, **kwargs):
1028
 
        try:
1029
 
            self.remove_from_connection()
1030
 
        except LookupError:
1031
 
            pass
1032
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1033
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1034
 
        Client.__del__(self, *args, **kwargs)
1035
 
    
1036
 
    def checker_callback(self, pid, condition, command,
1037
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
1038
243
        self.checker_callback_tag = None
 
244
        os.kill(self.checker.pid, signal.SIGTERM)
 
245
        if self.checker.poll() is None:
 
246
            os.kill(self.checker.pid, signal.SIGKILL)
1039
247
        self.checker = None
1040
 
        if os.WIFEXITED(condition):
1041
 
            exitstatus = os.WEXITSTATUS(condition)
1042
 
            # Emit D-Bus signal
1043
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1044
 
                                  dbus.Int64(condition),
1045
 
                                  dbus.String(command))
1046
 
        else:
1047
 
            # Emit D-Bus signal
1048
 
            self.CheckerCompleted(dbus.Int16(-1),
1049
 
                                  dbus.Int64(condition),
1050
 
                                  dbus.String(command))
1051
 
        
1052
 
        return Client.checker_callback(self, pid, condition, command,
1053
 
                                       *args, **kwargs)
1054
 
    
1055
 
    def start_checker(self, *args, **kwargs):
1056
 
        old_checker = self.checker
1057
 
        if self.checker is not None:
1058
 
            old_checker_pid = self.checker.pid
1059
 
        else:
1060
 
            old_checker_pid = None
1061
 
        r = Client.start_checker(self, *args, **kwargs)
1062
 
        # Only if new checker process was started
1063
 
        if (self.checker is not None
1064
 
            and old_checker_pid != self.checker.pid):
1065
 
            # Emit D-Bus signal
1066
 
            self.CheckerStarted(self.current_checker_command)
1067
 
        return r
1068
 
    
1069
 
    def _reset_approved(self):
1070
 
        self._approved = None
1071
 
        return False
1072
 
    
1073
 
    def approve(self, value=True):
1074
 
        self.send_changedstate()
1075
 
        self._approved = value
1076
 
        gobject.timeout_add(_timedelta_to_milliseconds
1077
 
                            (self.approval_duration),
1078
 
                            self._reset_approved)
1079
 
    
1080
 
    
1081
 
    ## D-Bus methods, signals & properties
1082
 
    _interface = "se.recompile.Mandos.Client"
1083
 
    
1084
 
    ## Signals
1085
 
    
1086
 
    # CheckerCompleted - signal
1087
 
    @dbus.service.signal(_interface, signature="nxs")
1088
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1089
 
        "D-Bus signal"
1090
 
        pass
1091
 
    
1092
 
    # CheckerStarted - signal
1093
 
    @dbus.service.signal(_interface, signature="s")
1094
 
    def CheckerStarted(self, command):
1095
 
        "D-Bus signal"
1096
 
        pass
1097
 
    
1098
 
    # PropertyChanged - signal
1099
 
    @dbus.service.signal(_interface, signature="sv")
1100
 
    def PropertyChanged(self, property, value):
1101
 
        "D-Bus signal"
1102
 
        pass
1103
 
    
1104
 
    # GotSecret - signal
1105
 
    @dbus.service.signal(_interface)
1106
 
    def GotSecret(self):
1107
 
        """D-Bus signal
1108
 
        Is sent after a successful transfer of secret from the Mandos
1109
 
        server to mandos-client
1110
 
        """
1111
 
        pass
1112
 
    
1113
 
    # Rejected - signal
1114
 
    @dbus.service.signal(_interface, signature="s")
1115
 
    def Rejected(self, reason):
1116
 
        "D-Bus signal"
1117
 
        pass
1118
 
    
1119
 
    # NeedApproval - signal
1120
 
    @dbus.service.signal(_interface, signature="tb")
1121
 
    def NeedApproval(self, timeout, default):
1122
 
        "D-Bus signal"
1123
 
        return self.need_approval()
1124
 
    
1125
 
    ## Methods
1126
 
    
1127
 
    # Approve - method
1128
 
    @dbus.service.method(_interface, in_signature="b")
1129
 
    def Approve(self, value):
1130
 
        self.approve(value)
1131
 
    
1132
 
    # CheckedOK - method
1133
 
    @dbus.service.method(_interface)
1134
 
    def CheckedOK(self):
1135
 
        self.checked_ok()
1136
 
    
1137
 
    # Enable - method
1138
 
    @dbus.service.method(_interface)
1139
 
    def Enable(self):
1140
 
        "D-Bus method"
1141
 
        self.enable()
1142
 
    
1143
 
    # StartChecker - method
1144
 
    @dbus.service.method(_interface)
1145
 
    def StartChecker(self):
1146
 
        "D-Bus method"
1147
 
        self.start_checker()
1148
 
    
1149
 
    # Disable - method
1150
 
    @dbus.service.method(_interface)
1151
 
    def Disable(self):
1152
 
        "D-Bus method"
1153
 
        self.disable()
1154
 
    
1155
 
    # StopChecker - method
1156
 
    @dbus.service.method(_interface)
1157
 
    def StopChecker(self):
1158
 
        self.stop_checker()
1159
 
    
1160
 
    ## Properties
1161
 
    
1162
 
    # ApprovalPending - property
1163
 
    @dbus_service_property(_interface, signature="b", access="read")
1164
 
    def ApprovalPending_dbus_property(self):
1165
 
        return dbus.Boolean(bool(self.approvals_pending))
1166
 
    
1167
 
    # ApprovedByDefault - property
1168
 
    @dbus_service_property(_interface, signature="b",
1169
 
                           access="readwrite")
1170
 
    def ApprovedByDefault_dbus_property(self, value=None):
1171
 
        if value is None:       # get
1172
 
            return dbus.Boolean(self.approved_by_default)
1173
 
        self.approved_by_default = bool(value)
1174
 
    
1175
 
    # ApprovalDelay - property
1176
 
    @dbus_service_property(_interface, signature="t",
1177
 
                           access="readwrite")
1178
 
    def ApprovalDelay_dbus_property(self, value=None):
1179
 
        if value is None:       # get
1180
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1181
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1182
 
    
1183
 
    # ApprovalDuration - property
1184
 
    @dbus_service_property(_interface, signature="t",
1185
 
                           access="readwrite")
1186
 
    def ApprovalDuration_dbus_property(self, value=None):
1187
 
        if value is None:       # get
1188
 
            return dbus.UInt64(_timedelta_to_milliseconds(
1189
 
                    self.approval_duration))
1190
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1191
 
    
1192
 
    # Name - property
1193
 
    @dbus_service_property(_interface, signature="s", access="read")
1194
 
    def Name_dbus_property(self):
1195
 
        return dbus.String(self.name)
1196
 
    
1197
 
    # Fingerprint - property
1198
 
    @dbus_service_property(_interface, signature="s", access="read")
1199
 
    def Fingerprint_dbus_property(self):
1200
 
        return dbus.String(self.fingerprint)
1201
 
    
1202
 
    # Host - property
1203
 
    @dbus_service_property(_interface, signature="s",
1204
 
                           access="readwrite")
1205
 
    def Host_dbus_property(self, value=None):
1206
 
        if value is None:       # get
1207
 
            return dbus.String(self.host)
1208
 
        self.host = value
1209
 
    
1210
 
    # Created - property
1211
 
    @dbus_service_property(_interface, signature="s", access="read")
1212
 
    def Created_dbus_property(self):
1213
 
        return dbus.String(datetime_to_dbus(self.created))
1214
 
    
1215
 
    # LastEnabled - property
1216
 
    @dbus_service_property(_interface, signature="s", access="read")
1217
 
    def LastEnabled_dbus_property(self):
1218
 
        return datetime_to_dbus(self.last_enabled)
1219
 
    
1220
 
    # Enabled - property
1221
 
    @dbus_service_property(_interface, signature="b",
1222
 
                           access="readwrite")
1223
 
    def Enabled_dbus_property(self, value=None):
1224
 
        if value is None:       # get
1225
 
            return dbus.Boolean(self.enabled)
1226
 
        if value:
1227
 
            self.enable()
1228
 
        else:
1229
 
            self.disable()
1230
 
    
1231
 
    # LastCheckedOK - property
1232
 
    @dbus_service_property(_interface, signature="s",
1233
 
                           access="readwrite")
1234
 
    def LastCheckedOK_dbus_property(self, value=None):
1235
 
        if value is not None:
1236
 
            self.checked_ok()
1237
 
            return
1238
 
        return datetime_to_dbus(self.last_checked_ok)
1239
 
    
1240
 
    # Expires - property
1241
 
    @dbus_service_property(_interface, signature="s", access="read")
1242
 
    def Expires_dbus_property(self):
1243
 
        return datetime_to_dbus(self.expires)
1244
 
    
1245
 
    # LastApprovalRequest - property
1246
 
    @dbus_service_property(_interface, signature="s", access="read")
1247
 
    def LastApprovalRequest_dbus_property(self):
1248
 
        return datetime_to_dbus(self.last_approval_request)
1249
 
    
1250
 
    # Timeout - property
1251
 
    @dbus_service_property(_interface, signature="t",
1252
 
                           access="readwrite")
1253
 
    def Timeout_dbus_property(self, value=None):
1254
 
        if value is None:       # get
1255
 
            return dbus.UInt64(self.timeout_milliseconds())
1256
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1257
 
        if getattr(self, "disable_initiator_tag", None) is None:
1258
 
            return
1259
 
        # Reschedule timeout
1260
 
        gobject.source_remove(self.disable_initiator_tag)
1261
 
        self.disable_initiator_tag = None
1262
 
        self.expires = None
1263
 
        time_to_die = _timedelta_to_milliseconds((self
1264
 
                                                  .last_checked_ok
1265
 
                                                  + self.timeout)
1266
 
                                                 - datetime.datetime
1267
 
                                                 .utcnow())
1268
 
        if time_to_die <= 0:
1269
 
            # The timeout has passed
1270
 
            self.disable()
1271
 
        else:
1272
 
            self.expires = (datetime.datetime.utcnow()
1273
 
                            + datetime.timedelta(milliseconds =
1274
 
                                                 time_to_die))
1275
 
            self.disable_initiator_tag = (gobject.timeout_add
1276
 
                                          (time_to_die, self.disable))
1277
 
    
1278
 
    # ExtendedTimeout - property
1279
 
    @dbus_service_property(_interface, signature="t",
1280
 
                           access="readwrite")
1281
 
    def ExtendedTimeout_dbus_property(self, value=None):
1282
 
        if value is None:       # get
1283
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1284
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1285
 
    
1286
 
    # Interval - property
1287
 
    @dbus_service_property(_interface, signature="t",
1288
 
                           access="readwrite")
1289
 
    def Interval_dbus_property(self, value=None):
1290
 
        if value is None:       # get
1291
 
            return dbus.UInt64(self.interval_milliseconds())
1292
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1293
 
        if getattr(self, "checker_initiator_tag", None) is None:
1294
 
            return
1295
 
        # Reschedule checker run
1296
 
        gobject.source_remove(self.checker_initiator_tag)
1297
 
        self.checker_initiator_tag = (gobject.timeout_add
1298
 
                                      (value, self.start_checker))
1299
 
        self.start_checker()    # Start one now, too
1300
 
    
1301
 
    # Checker - property
1302
 
    @dbus_service_property(_interface, signature="s",
1303
 
                           access="readwrite")
1304
 
    def Checker_dbus_property(self, value=None):
1305
 
        if value is None:       # get
1306
 
            return dbus.String(self.checker_command)
1307
 
        self.checker_command = value
1308
 
    
1309
 
    # CheckerRunning - property
1310
 
    @dbus_service_property(_interface, signature="b",
1311
 
                           access="readwrite")
1312
 
    def CheckerRunning_dbus_property(self, value=None):
1313
 
        if value is None:       # get
1314
 
            return dbus.Boolean(self.checker is not None)
1315
 
        if value:
1316
 
            self.start_checker()
1317
 
        else:
1318
 
            self.stop_checker()
1319
 
    
1320
 
    # ObjectPath - property
1321
 
    @dbus_service_property(_interface, signature="o", access="read")
1322
 
    def ObjectPath_dbus_property(self):
1323
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1324
 
    
1325
 
    # Secret = property
1326
 
    @dbus_service_property(_interface, signature="ay",
1327
 
                           access="write", byte_arrays=True)
1328
 
    def Secret_dbus_property(self, value):
1329
 
        self.secret = str(value)
1330
 
    
1331
 
    del _interface
1332
 
 
1333
 
 
1334
 
class ProxyClient(object):
1335
 
    def __init__(self, child_pipe, fpr, address):
1336
 
        self._pipe = child_pipe
1337
 
        self._pipe.send(('init', fpr, address))
1338
 
        if not self._pipe.recv():
1339
 
            raise KeyError()
1340
 
    
1341
 
    def __getattribute__(self, name):
1342
 
        if(name == '_pipe'):
1343
 
            return super(ProxyClient, self).__getattribute__(name)
1344
 
        self._pipe.send(('getattr', name))
1345
 
        data = self._pipe.recv()
1346
 
        if data[0] == 'data':
1347
 
            return data[1]
1348
 
        if data[0] == 'function':
1349
 
            def func(*args, **kwargs):
1350
 
                self._pipe.send(('funcall', name, args, kwargs))
1351
 
                return self._pipe.recv()[1]
1352
 
            return func
1353
 
    
1354
 
    def __setattr__(self, name, value):
1355
 
        if(name == '_pipe'):
1356
 
            return super(ProxyClient, self).__setattr__(name, value)
1357
 
        self._pipe.send(('setattr', name, value))
1358
 
 
1359
 
class ClientDBusTransitional(ClientDBus):
1360
 
    __metaclass__ = AlternateDBusNamesMetaclass
1361
 
 
1362
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1363
 
    """A class to handle client connections.
1364
 
    
1365
 
    Instantiated once for each connection to handle it.
 
248
    def still_valid(self, now=None):
 
249
        """Has the timeout not yet passed for this client?"""
 
250
        if now is None:
 
251
            now = datetime.datetime.now()
 
252
        if self.last_seen is None:
 
253
            return now < (self.created + self.timeout)
 
254
        else:
 
255
            return now < (self.last_seen + self.timeout)
 
256
 
 
257
 
 
258
def peer_certificate(session):
 
259
    # If not an OpenPGP certificate...
 
260
    if gnutls.library.functions.gnutls_certificate_type_get\
 
261
            (session._c_object) \
 
262
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
263
        # ...do the normal thing
 
264
        return session.peer_certificate
 
265
    list_size = ctypes.c_uint()
 
266
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
267
        (session._c_object, ctypes.byref(list_size))
 
268
    if list_size.value == 0:
 
269
        return None
 
270
    cert = cert_list[0]
 
271
    return ctypes.string_at(cert.data, cert.size)
 
272
 
 
273
 
 
274
def fingerprint(openpgp):
 
275
    # New empty GnuTLS certificate
 
276
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
277
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
278
        (ctypes.byref(crt))
 
279
    # New GnuTLS "datum" with the OpenPGP public key
 
280
    datum = gnutls.library.types.gnutls_datum_t\
 
281
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
282
                     ctypes.POINTER(ctypes.c_ubyte)),
 
283
         ctypes.c_uint(len(openpgp)))
 
284
    # Import the OpenPGP public key into the certificate
 
285
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
286
        (crt,
 
287
         ctypes.byref(datum),
 
288
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
289
    # New buffer for the fingerprint
 
290
    buffer = ctypes.create_string_buffer(20)
 
291
    buffer_length = ctypes.c_size_t()
 
292
    # Get the fingerprint from the certificate into the buffer
 
293
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
294
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
295
    # Deinit the certificate
 
296
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
297
    # Convert the buffer to a Python bytestring
 
298
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
299
    # Convert the bytestring to hexadecimal notation
 
300
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
301
    return hex_fpr
 
302
 
 
303
 
 
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
305
    """A TCP request handler class.
 
306
    Instantiated by IPv6_TCPServer for each request to handle it.
1366
307
    Note: This will run in its own forked process."""
1367
308
    
1368
309
    def handle(self):
1369
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1370
 
            logger.info("TCP connection from: %s",
1371
 
                        unicode(self.client_address))
1372
 
            logger.debug("Pipe FD: %d",
1373
 
                         self.server.child_pipe.fileno())
1374
 
            
1375
 
            session = (gnutls.connection
1376
 
                       .ClientSession(self.request,
1377
 
                                      gnutls.connection
1378
 
                                      .X509Credentials()))
1379
 
            
1380
 
            # Note: gnutls.connection.X509Credentials is really a
1381
 
            # generic GnuTLS certificate credentials object so long as
1382
 
            # no X.509 keys are added to it.  Therefore, we can use it
1383
 
            # here despite using OpenPGP certificates.
1384
 
            
1385
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1386
 
            #                      "+AES-256-CBC", "+SHA1",
1387
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1388
 
            #                      "+DHE-DSS"))
1389
 
            # Use a fallback default, since this MUST be set.
1390
 
            priority = self.server.gnutls_priority
1391
 
            if priority is None:
1392
 
                priority = "NORMAL"
1393
 
            (gnutls.library.functions
1394
 
             .gnutls_priority_set_direct(session._c_object,
1395
 
                                         priority, None))
1396
 
            
1397
 
            # Start communication using the Mandos protocol
1398
 
            # Get protocol number
1399
 
            line = self.request.makefile().readline()
1400
 
            logger.debug("Protocol version: %r", line)
1401
 
            try:
1402
 
                if int(line.strip().split()[0]) > 1:
1403
 
                    raise RuntimeError
1404
 
            except (ValueError, IndexError, RuntimeError) as error:
1405
 
                logger.error("Unknown protocol version: %s", error)
1406
 
                return
1407
 
            
1408
 
            # Start GnuTLS connection
1409
 
            try:
1410
 
                session.handshake()
1411
 
            except gnutls.errors.GNUTLSError as error:
1412
 
                logger.warning("Handshake failed: %s", error)
1413
 
                # Do not run session.bye() here: the session is not
1414
 
                # established.  Just abandon the request.
1415
 
                return
1416
 
            logger.debug("Handshake succeeded")
1417
 
            
1418
 
            approval_required = False
1419
 
            try:
1420
 
                try:
1421
 
                    fpr = self.fingerprint(self.peer_certificate
1422
 
                                           (session))
1423
 
                except (TypeError,
1424
 
                        gnutls.errors.GNUTLSError) as error:
1425
 
                    logger.warning("Bad certificate: %s", error)
1426
 
                    return
1427
 
                logger.debug("Fingerprint: %s", fpr)
1428
 
                
1429
 
                try:
1430
 
                    client = ProxyClient(child_pipe, fpr,
1431
 
                                         self.client_address)
1432
 
                except KeyError:
1433
 
                    return
1434
 
                
1435
 
                if client.approval_delay:
1436
 
                    delay = client.approval_delay
1437
 
                    client.approvals_pending += 1
1438
 
                    approval_required = True
1439
 
                
1440
 
                while True:
1441
 
                    if not client.enabled:
1442
 
                        logger.info("Client %s is disabled",
1443
 
                                       client.name)
1444
 
                        if self.server.use_dbus:
1445
 
                            # Emit D-Bus signal
1446
 
                            client.Rejected("Disabled")
1447
 
                        return
1448
 
                    
1449
 
                    if client._approved or not client.approval_delay:
1450
 
                        #We are approved or approval is disabled
1451
 
                        break
1452
 
                    elif client._approved is None:
1453
 
                        logger.info("Client %s needs approval",
1454
 
                                    client.name)
1455
 
                        if self.server.use_dbus:
1456
 
                            # Emit D-Bus signal
1457
 
                            client.NeedApproval(
1458
 
                                client.approval_delay_milliseconds(),
1459
 
                                client.approved_by_default)
1460
 
                    else:
1461
 
                        logger.warning("Client %s was not approved",
1462
 
                                       client.name)
1463
 
                        if self.server.use_dbus:
1464
 
                            # Emit D-Bus signal
1465
 
                            client.Rejected("Denied")
1466
 
                        return
1467
 
                    
1468
 
                    #wait until timeout or approved
1469
 
                    time = datetime.datetime.now()
1470
 
                    client.changedstate.acquire()
1471
 
                    (client.changedstate.wait
1472
 
                     (float(client._timedelta_to_milliseconds(delay)
1473
 
                            / 1000)))
1474
 
                    client.changedstate.release()
1475
 
                    time2 = datetime.datetime.now()
1476
 
                    if (time2 - time) >= delay:
1477
 
                        if not client.approved_by_default:
1478
 
                            logger.warning("Client %s timed out while"
1479
 
                                           " waiting for approval",
1480
 
                                           client.name)
1481
 
                            if self.server.use_dbus:
1482
 
                                # Emit D-Bus signal
1483
 
                                client.Rejected("Approval timed out")
1484
 
                            return
1485
 
                        else:
1486
 
                            break
1487
 
                    else:
1488
 
                        delay -= time2 - time
1489
 
                
1490
 
                sent_size = 0
1491
 
                while sent_size < len(client.secret):
1492
 
                    try:
1493
 
                        sent = session.send(client.secret[sent_size:])
1494
 
                    except gnutls.errors.GNUTLSError as error:
1495
 
                        logger.warning("gnutls send failed")
1496
 
                        return
1497
 
                    logger.debug("Sent: %d, remaining: %d",
1498
 
                                 sent, len(client.secret)
1499
 
                                 - (sent_size + sent))
1500
 
                    sent_size += sent
1501
 
                
1502
 
                logger.info("Sending secret to %s", client.name)
1503
 
                # bump the timeout using extended_timeout
1504
 
                client.checked_ok(client.extended_timeout)
1505
 
                if self.server.use_dbus:
1506
 
                    # Emit D-Bus signal
1507
 
                    client.GotSecret()
1508
 
            
1509
 
            finally:
1510
 
                if approval_required:
1511
 
                    client.approvals_pending -= 1
1512
 
                try:
1513
 
                    session.bye()
1514
 
                except gnutls.errors.GNUTLSError as error:
1515
 
                    logger.warning("GnuTLS bye failed")
1516
 
    
1517
 
    @staticmethod
1518
 
    def peer_certificate(session):
1519
 
        "Return the peer's OpenPGP certificate as a bytestring"
1520
 
        # If not an OpenPGP certificate...
1521
 
        if (gnutls.library.functions
1522
 
            .gnutls_certificate_type_get(session._c_object)
1523
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1524
 
            # ...do the normal thing
1525
 
            return session.peer_certificate
1526
 
        list_size = ctypes.c_uint(1)
1527
 
        cert_list = (gnutls.library.functions
1528
 
                     .gnutls_certificate_get_peers
1529
 
                     (session._c_object, ctypes.byref(list_size)))
1530
 
        if not bool(cert_list) and list_size.value != 0:
1531
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1532
 
                                            " certificate")
1533
 
        if list_size.value == 0:
1534
 
            return None
1535
 
        cert = cert_list[0]
1536
 
        return ctypes.string_at(cert.data, cert.size)
1537
 
    
1538
 
    @staticmethod
1539
 
    def fingerprint(openpgp):
1540
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1541
 
        # New GnuTLS "datum" with the OpenPGP public key
1542
 
        datum = (gnutls.library.types
1543
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1544
 
                                             ctypes.POINTER
1545
 
                                             (ctypes.c_ubyte)),
1546
 
                                 ctypes.c_uint(len(openpgp))))
1547
 
        # New empty GnuTLS certificate
1548
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1549
 
        (gnutls.library.functions
1550
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1551
 
        # Import the OpenPGP public key into the certificate
1552
 
        (gnutls.library.functions
1553
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1554
 
                                    gnutls.library.constants
1555
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1556
 
        # Verify the self signature in the key
1557
 
        crtverify = ctypes.c_uint()
1558
 
        (gnutls.library.functions
1559
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1560
 
                                         ctypes.byref(crtverify)))
1561
 
        if crtverify.value != 0:
1562
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1563
 
            raise (gnutls.errors.CertificateSecurityError
1564
 
                   ("Verify failed"))
1565
 
        # New buffer for the fingerprint
1566
 
        buf = ctypes.create_string_buffer(20)
1567
 
        buf_len = ctypes.c_size_t()
1568
 
        # Get the fingerprint from the certificate into the buffer
1569
 
        (gnutls.library.functions
1570
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1571
 
                                             ctypes.byref(buf_len)))
1572
 
        # Deinit the certificate
1573
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1574
 
        # Convert the buffer to a Python bytestring
1575
 
        fpr = ctypes.string_at(buf, buf_len.value)
1576
 
        # Convert the bytestring to hexadecimal notation
1577
 
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1578
 
        return hex_fpr
1579
 
 
1580
 
 
1581
 
class MultiprocessingMixIn(object):
1582
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1583
 
    def sub_process_main(self, request, address):
1584
 
        try:
1585
 
            self.finish_request(request, address)
1586
 
        except:
1587
 
            self.handle_error(request, address)
1588
 
        self.close_request(request)
1589
 
    
1590
 
    def process_request(self, request, address):
1591
 
        """Start a new process to process the request."""
1592
 
        proc = multiprocessing.Process(target = self.sub_process_main,
1593
 
                                       args = (request,
1594
 
                                               address))
1595
 
        proc.start()
1596
 
        return proc
1597
 
 
1598
 
 
1599
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1600
 
    """ adds a pipe to the MixIn """
1601
 
    def process_request(self, request, client_address):
1602
 
        """Overrides and wraps the original process_request().
1603
 
        
1604
 
        This function creates a new pipe in self.pipe
1605
 
        """
1606
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1607
 
        
1608
 
        proc = MultiprocessingMixIn.process_request(self, request,
1609
 
                                                    client_address)
1610
 
        self.child_pipe.close()
1611
 
        self.add_pipe(parent_pipe, proc)
1612
 
    
1613
 
    def add_pipe(self, parent_pipe, proc):
1614
 
        """Dummy function; override as necessary"""
1615
 
        raise NotImplementedError
1616
 
 
1617
 
 
1618
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1619
 
                     socketserver.TCPServer, object):
1620
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1621
 
    
 
310
        logger.debug(u"TCP connection from: %s",
 
311
                     unicode(self.client_address))
 
312
        session = gnutls.connection.ClientSession(self.request,
 
313
                                                  gnutls.connection.\
 
314
                                                  X509Credentials())
 
315
        
 
316
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
317
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
318
        #                "+DHE-DSS"))
 
319
        priority = "SECURE256"
 
320
        
 
321
        gnutls.library.functions.gnutls_priority_set_direct\
 
322
            (session._c_object, priority, None);
 
323
        
 
324
        try:
 
325
            session.handshake()
 
326
        except gnutls.errors.GNUTLSError, error:
 
327
            logger.debug(u"Handshake failed: %s", error)
 
328
            # Do not run session.bye() here: the session is not
 
329
            # established.  Just abandon the request.
 
330
            return
 
331
        try:
 
332
            fpr = fingerprint(peer_certificate(session))
 
333
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
334
            logger.debug(u"Bad certificate: %s", error)
 
335
            session.bye()
 
336
            return
 
337
        logger.debug(u"Fingerprint: %s", fpr)
 
338
        client = None
 
339
        for c in clients:
 
340
            if c.fingerprint == fpr:
 
341
                client = c
 
342
                break
 
343
        # Have to check if client.still_valid(), since it is possible
 
344
        # that the client timed out while establishing the GnuTLS
 
345
        # session.
 
346
        if (not client) or (not client.still_valid()):
 
347
            if client:
 
348
                logger.debug(u"Client %(name)s is invalid",
 
349
                             vars(client))
 
350
            else:
 
351
                logger.debug(u"Client not found for fingerprint: %s",
 
352
                             fpr)
 
353
            session.bye()
 
354
            return
 
355
        sent_size = 0
 
356
        while sent_size < len(client.secret):
 
357
            sent = session.send(client.secret[sent_size:])
 
358
            logger.debug(u"Sent: %d, remaining: %d",
 
359
                         sent, len(client.secret)
 
360
                         - (sent_size + sent))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1622
367
    Attributes:
1623
 
        enabled:        Boolean; whether this server is activated yet
1624
 
        interface:      None or a network interface name (string)
1625
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1626
370
    """
1627
 
    def __init__(self, server_address, RequestHandlerClass,
1628
 
                 interface=None, use_ipv6=True):
1629
 
        self.interface = interface
1630
 
        if use_ipv6:
1631
 
            self.address_family = socket.AF_INET6
1632
 
        socketserver.TCPServer.__init__(self, server_address,
1633
 
                                        RequestHandlerClass)
 
371
    address_family = socket.AF_INET6
 
372
    def __init__(self, *args, **kwargs):
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
 
376
        if "clients" in kwargs:
 
377
            self.clients = kwargs["clients"]
 
378
            del kwargs["clients"]
 
379
        return super(type(self), self).__init__(*args, **kwargs)
1634
380
    def server_bind(self):
1635
381
        """This overrides the normal server_bind() function
1636
382
        to bind to an interface if one was specified, and also NOT to
1637
383
        bind to an address or port if they were not specified."""
1638
 
        if self.interface is not None:
1639
 
            if SO_BINDTODEVICE is None:
1640
 
                logger.error("SO_BINDTODEVICE does not exist;"
1641
 
                             " cannot bind to interface %s",
1642
 
                             self.interface)
1643
 
            else:
1644
 
                try:
1645
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1646
 
                                           SO_BINDTODEVICE,
1647
 
                                           str(self.interface
1648
 
                                               + '\0'))
1649
 
                except socket.error as error:
1650
 
                    if error[0] == errno.EPERM:
1651
 
                        logger.error("No permission to"
1652
 
                                     " bind to interface %s",
1653
 
                                     self.interface)
1654
 
                    elif error[0] == errno.ENOPROTOOPT:
1655
 
                        logger.error("SO_BINDTODEVICE not available;"
1656
 
                                     " cannot bind to interface %s",
1657
 
                                     self.interface)
1658
 
                    else:
1659
 
                        raise
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
 
388
            try:
 
389
                self.socket.setsockopt(socket.SOL_SOCKET,
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
 
392
            except socket.error, error:
 
393
                if error[0] == errno.EPERM:
 
394
                    logger.warning(u"No permission to"
 
395
                                   u" bind to interface %s",
 
396
                                   self.options.interface)
 
397
                else:
 
398
                    raise error
1660
399
        # Only bind(2) the socket if we really need to.
1661
400
        if self.server_address[0] or self.server_address[1]:
1662
401
            if not self.server_address[0]:
1663
 
                if self.address_family == socket.AF_INET6:
1664
 
                    any_address = "::" # in6addr_any
1665
 
                else:
1666
 
                    any_address = socket.INADDR_ANY
1667
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1668
404
                                       self.server_address[1])
1669
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1670
406
                self.server_address = (self.server_address[0],
1671
407
                                       0)
1672
 
#                 if self.interface:
1673
 
#                     self.server_address = (self.server_address[0],
1674
 
#                                            0, # port
1675
 
#                                            0, # flowinfo
1676
 
#                                            if_nametoindex
1677
 
#                                            (self.interface))
1678
 
            return socketserver.TCPServer.server_bind(self)
1679
 
 
1680
 
 
1681
 
class MandosServer(IPv6_TCPServer):
1682
 
    """Mandos server.
1683
 
    
1684
 
    Attributes:
1685
 
        clients:        set of Client objects
1686
 
        gnutls_priority GnuTLS priority string
1687
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1688
 
    
1689
 
    Assumes a gobject.MainLoop event loop.
1690
 
    """
1691
 
    def __init__(self, server_address, RequestHandlerClass,
1692
 
                 interface=None, use_ipv6=True, clients=None,
1693
 
                 gnutls_priority=None, use_dbus=True):
1694
 
        self.enabled = False
1695
 
        self.clients = clients
1696
 
        if self.clients is None:
1697
 
            self.clients = {}
1698
 
        self.use_dbus = use_dbus
1699
 
        self.gnutls_priority = gnutls_priority
1700
 
        IPv6_TCPServer.__init__(self, server_address,
1701
 
                                RequestHandlerClass,
1702
 
                                interface = interface,
1703
 
                                use_ipv6 = use_ipv6)
1704
 
    def server_activate(self):
1705
 
        if self.enabled:
1706
 
            return socketserver.TCPServer.server_activate(self)
1707
 
    
1708
 
    def enable(self):
1709
 
        self.enabled = True
1710
 
    
1711
 
    def add_pipe(self, parent_pipe, proc):
1712
 
        # Call "handle_ipc" for both data and EOF events
1713
 
        gobject.io_add_watch(parent_pipe.fileno(),
1714
 
                             gobject.IO_IN | gobject.IO_HUP,
1715
 
                             functools.partial(self.handle_ipc,
1716
 
                                               parent_pipe =
1717
 
                                               parent_pipe,
1718
 
                                               proc = proc))
1719
 
    
1720
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1721
 
                   proc = None, client_object=None):
1722
 
        condition_names = {
1723
 
            gobject.IO_IN: "IN",   # There is data to read.
1724
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1725
 
                                    # blocking).
1726
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1727
 
            gobject.IO_ERR: "ERR", # Error condition.
1728
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1729
 
                                    # broken, usually for pipes and
1730
 
                                    # sockets).
1731
 
            }
1732
 
        conditions_string = ' | '.join(name
1733
 
                                       for cond, name in
1734
 
                                       condition_names.iteritems()
1735
 
                                       if cond & condition)
1736
 
        # error, or the other end of multiprocessing.Pipe has closed
1737
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1738
 
            # Wait for other process to exit
1739
 
            proc.join()
1740
 
            return False
1741
 
        
1742
 
        # Read a request from the child
1743
 
        request = parent_pipe.recv()
1744
 
        command = request[0]
1745
 
        
1746
 
        if command == 'init':
1747
 
            fpr = request[1]
1748
 
            address = request[2]
1749
 
            
1750
 
            for c in self.clients.itervalues():
1751
 
                if c.fingerprint == fpr:
1752
 
                    client = c
1753
 
                    break
1754
 
            else:
1755
 
                logger.info("Client not found for fingerprint: %s, ad"
1756
 
                            "dress: %s", fpr, address)
1757
 
                if self.use_dbus:
1758
 
                    # Emit D-Bus signal
1759
 
                    mandos_dbus_service.ClientNotFound(fpr,
1760
 
                                                       address[0])
1761
 
                parent_pipe.send(False)
1762
 
                return False
1763
 
            
1764
 
            gobject.io_add_watch(parent_pipe.fileno(),
1765
 
                                 gobject.IO_IN | gobject.IO_HUP,
1766
 
                                 functools.partial(self.handle_ipc,
1767
 
                                                   parent_pipe =
1768
 
                                                   parent_pipe,
1769
 
                                                   proc = proc,
1770
 
                                                   client_object =
1771
 
                                                   client))
1772
 
            parent_pipe.send(True)
1773
 
            # remove the old hook in favor of the new above hook on
1774
 
            # same fileno
1775
 
            return False
1776
 
        if command == 'funcall':
1777
 
            funcname = request[1]
1778
 
            args = request[2]
1779
 
            kwargs = request[3]
1780
 
            
1781
 
            parent_pipe.send(('data', getattr(client_object,
1782
 
                                              funcname)(*args,
1783
 
                                                         **kwargs)))
1784
 
        
1785
 
        if command == 'getattr':
1786
 
            attrname = request[1]
1787
 
            if callable(client_object.__getattribute__(attrname)):
1788
 
                parent_pipe.send(('function',))
1789
 
            else:
1790
 
                parent_pipe.send(('data', client_object
1791
 
                                  .__getattribute__(attrname)))
1792
 
        
1793
 
        if command == 'setattr':
1794
 
            attrname = request[1]
1795
 
            value = request[2]
1796
 
            setattr(client_object, attrname, value)
1797
 
        
1798
 
        return True
 
408
            return super(type(self), self).server_bind()
1799
409
 
1800
410
 
1801
411
def string_to_delta(interval):
1802
412
    """Parse a string and return a datetime.timedelta
1803
 
    
 
413
 
1804
414
    >>> string_to_delta('7d')
1805
415
    datetime.timedelta(7)
1806
416
    >>> string_to_delta('60s')
1809
419
    datetime.timedelta(0, 3600)
1810
420
    >>> string_to_delta('24h')
1811
421
    datetime.timedelta(1)
1812
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1813
423
    datetime.timedelta(7)
1814
 
    >>> string_to_delta('5m 30s')
1815
 
    datetime.timedelta(0, 330)
1816
424
    """
1817
 
    timevalue = datetime.timedelta(0)
1818
 
    for s in interval.split():
1819
 
        try:
1820
 
            suffix = unicode(s[-1])
1821
 
            value = int(s[:-1])
1822
 
            if suffix == "d":
1823
 
                delta = datetime.timedelta(value)
1824
 
            elif suffix == "s":
1825
 
                delta = datetime.timedelta(0, value)
1826
 
            elif suffix == "m":
1827
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1828
 
            elif suffix == "h":
1829
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1830
 
            elif suffix == "w":
1831
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1832
 
            else:
1833
 
                raise ValueError("Unknown suffix %r" % suffix)
1834
 
        except (ValueError, IndexError) as e:
1835
 
            raise ValueError(*(e.args))
1836
 
        timevalue += delta
1837
 
    return timevalue
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
 
439
            raise ValueError
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
457
                 serviceName, serviceType)
 
458
    
 
459
    group.AddService(
 
460
            serviceInterface,           # interface
 
461
            avahi.PROTO_INET6,          # protocol
 
462
            dbus.UInt32(0),             # flags
 
463
            serviceName, serviceType,
 
464
            domain, host,
 
465
            dbus.UInt16(servicePort),
 
466
            avahi.string_array_to_txt_array(serviceTXT))
 
467
    group.Commit()
 
468
 
 
469
 
 
470
def remove_service():
 
471
    """From the Avahi server example code"""
 
472
    global group
 
473
    
 
474
    if not group is None:
 
475
        group.Reset()
 
476
 
 
477
 
 
478
def server_state_changed(state):
 
479
    """From the Avahi server example code"""
 
480
    if state == avahi.SERVER_COLLISION:
 
481
        logger.warning(u"Server name collision")
 
482
        remove_service()
 
483
    elif state == avahi.SERVER_RUNNING:
 
484
        add_service()
 
485
 
 
486
 
 
487
def entry_group_state_changed(state, error):
 
488
    """From the Avahi server example code"""
 
489
    global serviceName, server, rename_count
 
490
    
 
491
    logger.debug(u"state change: %i", state)
 
492
    
 
493
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
494
        logger.debug(u"Service established.")
 
495
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
496
        
 
497
        rename_count = rename_count - 1
 
498
        if rename_count > 0:
 
499
            name = server.GetAlternativeServiceName(name)
 
500
            logger.warning(u"Service name collision, "
 
501
                           u"changing name to '%s' ...", name)
 
502
            remove_service()
 
503
            add_service()
 
504
            
 
505
        else:
 
506
            logger.error(u"No suitable service name found "
 
507
                         u"after %i retries, exiting.",
 
508
                         n_rename)
 
509
            main_loop.quit()
 
510
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
511
        logger.error(u"Error in group state changed %s",
 
512
                     unicode(error))
 
513
        main_loop.quit()
 
514
        return
1838
515
 
1839
516
 
1840
517
def if_nametoindex(interface):
1841
 
    """Call the C function if_nametoindex(), or equivalent
1842
 
    
1843
 
    Note: This function cannot accept a unicode string."""
1844
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1845
519
    try:
1846
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1847
 
                          (ctypes.util.find_library("c"))
1848
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1849
522
    except (OSError, AttributeError):
1850
 
        logger.warning("Doing if_nametoindex the hard way")
1851
 
        def if_nametoindex(interface):
1852
 
            "Get an interface index the hard way, i.e. using fcntl()"
1853
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1854
 
            with contextlib.closing(socket.socket()) as s:
1855
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1856
 
                                    struct.pack(str("16s16x"),
1857
 
                                                interface))
1858
 
            interface_index = struct.unpack(str("I"),
1859
 
                                            ifreq[16:20])[0]
1860
 
            return interface_index
1861
 
    return if_nametoindex(interface)
1862
 
 
1863
 
 
1864
 
def daemon(nochdir = False, noclose = False):
1865
 
    """See daemon(3).  Standard BSD Unix function.
1866
 
    
1867
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1868
 
    if os.fork():
1869
 
        sys.exit()
1870
 
    os.setsid()
1871
 
    if not nochdir:
1872
 
        os.chdir("/")
1873
 
    if os.fork():
1874
 
        sys.exit()
1875
 
    if not noclose:
1876
 
        # Close all standard open file descriptors
1877
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1878
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1879
 
            raise OSError(errno.ENODEV,
1880
 
                          "%s not a character device"
1881
 
                          % os.path.devnull)
1882
 
        os.dup2(null, sys.stdin.fileno())
1883
 
        os.dup2(null, sys.stdout.fileno())
1884
 
        os.dup2(null, sys.stderr.fileno())
1885
 
        if null > 2:
1886
 
            os.close(null)
1887
 
 
1888
 
 
1889
 
def main():
1890
 
    
1891
 
    ##################################################################
1892
 
    # Parsing of options, both command line and config file
1893
 
    
1894
 
    parser = argparse.ArgumentParser()
1895
 
    parser.add_argument("-v", "--version", action="version",
1896
 
                        version = "%%(prog)s %s" % version,
1897
 
                        help="show version number and exit")
1898
 
    parser.add_argument("-i", "--interface", metavar="IF",
1899
 
                        help="Bind to interface IF")
1900
 
    parser.add_argument("-a", "--address",
1901
 
                        help="Address to listen for requests on")
1902
 
    parser.add_argument("-p", "--port", type=int,
1903
 
                        help="Port number to receive requests on")
1904
 
    parser.add_argument("--check", action="store_true",
1905
 
                        help="Run self-test")
1906
 
    parser.add_argument("--debug", action="store_true",
1907
 
                        help="Debug mode; run in foreground and log"
1908
 
                        " to terminal")
1909
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1910
 
                        help="Debug level for stdout output")
1911
 
    parser.add_argument("--priority", help="GnuTLS"
1912
 
                        " priority string (see GnuTLS documentation)")
1913
 
    parser.add_argument("--servicename",
1914
 
                        metavar="NAME", help="Zeroconf service name")
1915
 
    parser.add_argument("--configdir",
1916
 
                        default="/etc/mandos", metavar="DIR",
1917
 
                        help="Directory to search for configuration"
1918
 
                        " files")
1919
 
    parser.add_argument("--no-dbus", action="store_false",
1920
 
                        dest="use_dbus", help="Do not provide D-Bus"
1921
 
                        " system bus interface")
1922
 
    parser.add_argument("--no-ipv6", action="store_false",
1923
 
                        dest="use_ipv6", help="Do not use IPv6")
1924
 
    parser.add_argument("--no-restore", action="store_false",
1925
 
                        dest="restore", help="Do not restore stored state",
1926
 
                        default=True)
1927
 
 
1928
 
    options = parser.parse_args()
 
523
        if "struct" not in sys.modules:
 
524
            import struct
 
525
        if "fcntl" not in sys.modules:
 
526
            import fcntl
 
527
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
528
        s = socket.socket()
 
529
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
530
                            struct.pack("16s16x", interface))
 
531
        s.close()
 
532
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
533
        return interface_index
 
534
 
 
535
 
 
536
if __name__ == '__main__':
 
537
    parser = OptionParser()
 
538
    parser.add_option("-i", "--interface", type="string",
 
539
                      default=None, metavar="IF",
 
540
                      help="Bind to interface IF")
 
541
    parser.add_option("--cert", type="string", default="cert.pem",
 
542
                      metavar="FILE",
 
543
                      help="Public key certificate PEM file to use")
 
544
    parser.add_option("--key", type="string", default="key.pem",
 
545
                      metavar="FILE",
 
546
                      help="Private key PEM file to use")
 
547
    parser.add_option("--ca", type="string", default="ca.pem",
 
548
                      metavar="FILE",
 
549
                      help="Certificate Authority certificate PEM file to use")
 
550
    parser.add_option("--crl", type="string", default="crl.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Revokation List PEM file to use")
 
553
    parser.add_option("-p", "--port", type="int", default=None,
 
554
                      help="Port number to receive requests on")
 
555
    parser.add_option("--timeout", type="string", # Parsed later
 
556
                      default="1h",
 
557
                      help="Amount of downtime allowed for clients")
 
558
    parser.add_option("--interval", type="string", # Parsed later
 
559
                      default="5m",
 
560
                      help="How often to check that a client is up")
 
561
    parser.add_option("--check", action="store_true", default=False,
 
562
                      help="Run self-test")
 
563
    parser.add_option("--debug", action="store_true", default=False,
 
564
                      help="Debug mode")
 
565
    (options, args) = parser.parse_args()
1929
566
    
1930
567
    if options.check:
1931
568
        import doctest
1932
569
        doctest.testmod()
1933
570
        sys.exit()
1934
571
    
1935
 
    # Default values for config file for server-global settings
1936
 
    server_defaults = { "interface": "",
1937
 
                        "address": "",
1938
 
                        "port": "",
1939
 
                        "debug": "False",
1940
 
                        "priority":
1941
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1942
 
                        "servicename": "Mandos",
1943
 
                        "use_dbus": "True",
1944
 
                        "use_ipv6": "True",
1945
 
                        "debuglevel": "",
1946
 
                        }
1947
 
    
1948
 
    # Parse config file for server-global settings
1949
 
    server_config = configparser.SafeConfigParser(server_defaults)
1950
 
    del server_defaults
1951
 
    server_config.read(os.path.join(options.configdir,
1952
 
                                    "mandos.conf"))
1953
 
    # Convert the SafeConfigParser object to a dict
1954
 
    server_settings = server_config.defaults()
1955
 
    # Use the appropriate methods on the non-string config options
1956
 
    for option in ("debug", "use_dbus", "use_ipv6"):
1957
 
        server_settings[option] = server_config.getboolean("DEFAULT",
1958
 
                                                           option)
1959
 
    if server_settings["port"]:
1960
 
        server_settings["port"] = server_config.getint("DEFAULT",
1961
 
                                                       "port")
1962
 
    del server_config
1963
 
    
1964
 
    # Override the settings from the config file with command line
1965
 
    # options, if set.
1966
 
    for option in ("interface", "address", "port", "debug",
1967
 
                   "priority", "servicename", "configdir",
1968
 
                   "use_dbus", "use_ipv6", "debuglevel", "restore"):
1969
 
        value = getattr(options, option)
1970
 
        if value is not None:
1971
 
            server_settings[option] = value
1972
 
    del options
1973
 
    # Force all strings to be unicode
1974
 
    for option in server_settings.keys():
1975
 
        if type(server_settings[option]) is str:
1976
 
            server_settings[option] = unicode(server_settings[option])
1977
 
    # Now we have our good server settings in "server_settings"
1978
 
    
1979
 
    ##################################################################
1980
 
    
1981
 
    # For convenience
1982
 
    debug = server_settings["debug"]
1983
 
    debuglevel = server_settings["debuglevel"]
1984
 
    use_dbus = server_settings["use_dbus"]
1985
 
    use_ipv6 = server_settings["use_ipv6"]
1986
 
    
1987
 
    if server_settings["servicename"] != "Mandos":
1988
 
        syslogger.setFormatter(logging.Formatter
1989
 
                               ('Mandos (%s) [%%(process)d]:'
1990
 
                                ' %%(levelname)s: %%(message)s'
1991
 
                                % server_settings["servicename"]))
1992
 
    
1993
 
    # Parse config file with clients
1994
 
    client_defaults = { "timeout": "5m",
1995
 
                        "extended_timeout": "15m",
1996
 
                        "interval": "2m",
1997
 
                        "checker": "fping -q -- %%(host)s",
1998
 
                        "host": "",
1999
 
                        "approval_delay": "0s",
2000
 
                        "approval_duration": "1s",
2001
 
                        }
2002
 
    client_config = configparser.SafeConfigParser(client_defaults)
2003
 
    client_config.read(os.path.join(server_settings["configdir"],
2004
 
                                    "clients.conf"))
2005
 
    
2006
 
    global mandos_dbus_service
2007
 
    mandos_dbus_service = None
2008
 
    
2009
 
    tcp_server = MandosServer((server_settings["address"],
2010
 
                               server_settings["port"]),
2011
 
                              ClientHandler,
2012
 
                              interface=(server_settings["interface"]
2013
 
                                         or None),
2014
 
                              use_ipv6=use_ipv6,
2015
 
                              gnutls_priority=
2016
 
                              server_settings["priority"],
2017
 
                              use_dbus=use_dbus)
2018
 
    if not debug:
2019
 
        pidfilename = "/var/run/mandos.pid"
2020
 
        try:
2021
 
            pidfile = open(pidfilename, "w")
2022
 
        except IOError:
2023
 
            logger.error("Could not open file %r", pidfilename)
2024
 
    
2025
 
    try:
2026
 
        uid = pwd.getpwnam("_mandos").pw_uid
2027
 
        gid = pwd.getpwnam("_mandos").pw_gid
2028
 
    except KeyError:
2029
 
        try:
2030
 
            uid = pwd.getpwnam("mandos").pw_uid
2031
 
            gid = pwd.getpwnam("mandos").pw_gid
2032
 
        except KeyError:
2033
 
            try:
2034
 
                uid = pwd.getpwnam("nobody").pw_uid
2035
 
                gid = pwd.getpwnam("nobody").pw_gid
2036
 
            except KeyError:
2037
 
                uid = 65534
2038
 
                gid = 65534
2039
 
    try:
2040
 
        os.setgid(gid)
2041
 
        os.setuid(uid)
2042
 
    except OSError as error:
2043
 
        if error[0] != errno.EPERM:
2044
 
            raise error
2045
 
    
2046
 
    if not debug and not debuglevel:
2047
 
        logger.setLevel(logging.WARNING)
2048
 
    if debuglevel:
2049
 
        level = getattr(logging, debuglevel.upper())
2050
 
        logger.setLevel(level)
2051
 
    
2052
 
    if debug:
2053
 
        logger.setLevel(logging.DEBUG)
2054
 
        # Enable all possible GnuTLS debugging
2055
 
        
2056
 
        # "Use a log level over 10 to enable all debugging options."
2057
 
        # - GnuTLS manual
2058
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
2059
 
        
2060
 
        @gnutls.library.types.gnutls_log_func
2061
 
        def debug_gnutls(level, string):
2062
 
            logger.debug("GnuTLS: %s", string[:-1])
2063
 
        
2064
 
        (gnutls.library.functions
2065
 
         .gnutls_global_set_log_function(debug_gnutls))
2066
 
        
2067
 
        # Redirect stdin so all checkers get /dev/null
2068
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2069
 
        os.dup2(null, sys.stdin.fileno())
2070
 
        if null > 2:
2071
 
            os.close(null)
2072
 
    else:
2073
 
        # No console logging
2074
 
        logger.removeHandler(console)
2075
 
    
2076
 
    # Need to fork before connecting to D-Bus
2077
 
    if not debug:
2078
 
        # Close all input and output, do double fork, etc.
2079
 
        daemon()
2080
 
    
2081
 
    global main_loop
2082
 
    # From the Avahi example code
 
572
    # Parse the time arguments
 
573
    try:
 
574
        options.timeout = string_to_delta(options.timeout)
 
575
    except ValueError:
 
576
        parser.error("option --timeout: Unparseable time")
 
577
    try:
 
578
        options.interval = string_to_delta(options.interval)
 
579
    except ValueError:
 
580
        parser.error("option --interval: Unparseable time")
 
581
    
 
582
    # Parse config file
 
583
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
584
    client_config = ConfigParser.SafeConfigParser(defaults)
 
585
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
586
    client_config.read("mandos-clients.conf")
 
587
    
 
588
    # From the Avahi server example code
2083
589
    DBusGMainLoop(set_as_default=True )
2084
590
    main_loop = gobject.MainLoop()
2085
591
    bus = dbus.SystemBus()
2086
 
    # End of Avahi example code
2087
 
    if use_dbus:
2088
 
        try:
2089
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
2090
 
                                            bus, do_not_queue=True)
2091
 
            old_bus_name = (dbus.service.BusName
2092
 
                            ("se.bsnet.fukt.Mandos", bus,
2093
 
                             do_not_queue=True))
2094
 
        except dbus.exceptions.NameExistsException as e:
2095
 
            logger.error(unicode(e) + ", disabling D-Bus")
2096
 
            use_dbus = False
2097
 
            server_settings["use_dbus"] = False
2098
 
            tcp_server.use_dbus = False
2099
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2100
 
    service = AvahiServiceToSyslog(name =
2101
 
                                   server_settings["servicename"],
2102
 
                                   servicetype = "_mandos._tcp",
2103
 
                                   protocol = protocol, bus = bus)
2104
 
    if server_settings["interface"]:
2105
 
        service.interface = (if_nametoindex
2106
 
                             (str(server_settings["interface"])))
2107
 
    
2108
 
    global multiprocessing_manager
2109
 
    multiprocessing_manager = multiprocessing.Manager()
2110
 
    
2111
 
    client_class = Client
2112
 
    if use_dbus:
2113
 
        client_class = functools.partial(ClientDBusTransitional,
2114
 
                                         bus = bus)
2115
 
    
2116
 
    special_settings = {
2117
 
        # Some settings need to be accessd by special methods;
2118
 
        # booleans need .getboolean(), etc.  Here is a list of them:
2119
 
        "approved_by_default":
2120
 
            lambda section:
2121
 
            client_config.getboolean(section, "approved_by_default"),
2122
 
        }
2123
 
    # Construct a new dict of client settings of this form:
2124
 
    # { client_name: {setting_name: value, ...}, ...}
2125
 
    # with exceptions for any special settings as defined above
2126
 
    client_settings = dict((clientname,
2127
 
                           dict((setting,
2128
 
                                 (value if setting not in special_settings
2129
 
                                  else special_settings[setting](clientname)))
2130
 
                                for setting, value in client_config.items(clientname)))
2131
 
                          for clientname in client_config.sections())
2132
 
    
2133
 
    old_client_settings = {}
2134
 
    clients_data = []
2135
 
 
2136
 
    # Get client data and settings from last running state. 
2137
 
    if server_settings["restore"]:
2138
 
        try:
2139
 
            with open(stored_state_path, "rb") as stored_state:
2140
 
                clients_data, old_client_settings = pickle.load(stored_state)
2141
 
            os.remove(stored_state_path)
2142
 
        except IOError as e:
2143
 
            logger.warning("Could not load persistant state: {0}".format(e))
2144
 
            if e.errno != errno.ENOENT:
2145
 
                raise
2146
 
 
2147
 
    for client in clients_data:
2148
 
        client_name = client["name"]
2149
 
        
2150
 
        # Decide which value to use after restoring saved state.
2151
 
        # We have three different values: Old config file,
2152
 
        # new config file, and saved state.
2153
 
        # New config value takes precedence if it differs from old
2154
 
        # config value, otherwise use saved state.
2155
 
        for name, value in client_settings[client_name].items():
2156
 
            try:
2157
 
                # For each value in new config, check if it differs
2158
 
                # from the old config value (Except for the "secret"
2159
 
                # attribute)
2160
 
                if name != "secret" and value != old_client_settings[client_name][name]:
2161
 
                    setattr(client, name, value)
2162
 
            except KeyError:
2163
 
                pass
2164
 
 
2165
 
        # Clients who has passed its expire date, can still be enabled if its
2166
 
        # last checker was sucessful. Clients who checkers failed before we
2167
 
        # stored it state is asumed to had failed checker during downtime.
2168
 
        if client["enabled"] and client["last_checked_ok"]:
2169
 
            if ((datetime.datetime.utcnow() - client["last_checked_ok"])
2170
 
                > client["interval"]):
2171
 
                if client["last_checker_status"] != 0:
2172
 
                    client["enabled"] = False
2173
 
                else:
2174
 
                    client["expires"] = datetime.datetime.utcnow() + client["timeout"]
2175
 
 
2176
 
        client["changedstate"] = (multiprocessing_manager
2177
 
                                  .Condition(multiprocessing_manager
2178
 
                                             .Lock()))
2179
 
        if use_dbus:
2180
 
            new_client = ClientDBusTransitional.__new__(ClientDBusTransitional)
2181
 
            tcp_server.clients[client_name] = new_client
2182
 
            new_client.bus = bus
2183
 
            for name, value in client.iteritems():
2184
 
                setattr(new_client, name, value)
2185
 
            client_object_name = unicode(client_name).translate(
2186
 
                {ord("."): ord("_"),
2187
 
                 ord("-"): ord("_")})
2188
 
            new_client.dbus_object_path = (dbus.ObjectPath
2189
 
                                     ("/clients/" + client_object_name))
2190
 
            DBusObjectWithProperties.__init__(new_client,
2191
 
                                              new_client.bus,
2192
 
                                              new_client.dbus_object_path)
2193
 
        else:
2194
 
            tcp_server.clients[client_name] = Client.__new__(Client)
2195
 
            for name, value in client.iteritems():
2196
 
                setattr(tcp_server.clients[client_name], name, value)
2197
 
                
2198
 
        tcp_server.clients[client_name].decrypt_secret(
2199
 
            client_settings[client_name]["secret"])            
2200
 
        
2201
 
    # Create/remove clients based on new changes made to config
2202
 
    for clientname in set(old_client_settings) - set(client_settings):
2203
 
        del tcp_server.clients[clientname]
2204
 
    for clientname in set(client_settings) - set(old_client_settings):
2205
 
        tcp_server.clients[clientname] = (client_class(name = clientname,
2206
 
                                                       config =
2207
 
                                                       client_settings
2208
 
                                                       [clientname]))
2209
 
    
2210
 
 
2211
 
    if not tcp_server.clients:
2212
 
        logger.warning("No clients defined")
2213
 
        
2214
 
    if not debug:
2215
 
        try:
2216
 
            with pidfile:
2217
 
                pid = os.getpid()
2218
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2219
 
            del pidfile
2220
 
        except IOError:
2221
 
            logger.error("Could not write to file %r with PID %d",
2222
 
                         pidfilename, pid)
2223
 
        except NameError:
2224
 
            # "pidfile" was never created
2225
 
            pass
2226
 
        del pidfilename
2227
 
        
2228
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2229
 
    
2230
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2231
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2232
 
    
2233
 
    if use_dbus:
2234
 
        class MandosDBusService(dbus.service.Object):
2235
 
            """A D-Bus proxy object"""
2236
 
            def __init__(self):
2237
 
                dbus.service.Object.__init__(self, bus, "/")
2238
 
            _interface = "se.recompile.Mandos"
2239
 
            
2240
 
            @dbus.service.signal(_interface, signature="o")
2241
 
            def ClientAdded(self, objpath):
2242
 
                "D-Bus signal"
2243
 
                pass
2244
 
            
2245
 
            @dbus.service.signal(_interface, signature="ss")
2246
 
            def ClientNotFound(self, fingerprint, address):
2247
 
                "D-Bus signal"
2248
 
                pass
2249
 
            
2250
 
            @dbus.service.signal(_interface, signature="os")
2251
 
            def ClientRemoved(self, objpath, name):
2252
 
                "D-Bus signal"
2253
 
                pass
2254
 
            
2255
 
            @dbus.service.method(_interface, out_signature="ao")
2256
 
            def GetAllClients(self):
2257
 
                "D-Bus method"
2258
 
                return dbus.Array(c.dbus_object_path
2259
 
                                  for c in
2260
 
                                  tcp_server.clients.itervalues())
2261
 
            
2262
 
            @dbus.service.method(_interface,
2263
 
                                 out_signature="a{oa{sv}}")
2264
 
            def GetAllClientsWithProperties(self):
2265
 
                "D-Bus method"
2266
 
                return dbus.Dictionary(
2267
 
                    ((c.dbus_object_path, c.GetAll(""))
2268
 
                     for c in tcp_server.clients.itervalues()),
2269
 
                    signature="oa{sv}")
2270
 
            
2271
 
            @dbus.service.method(_interface, in_signature="o")
2272
 
            def RemoveClient(self, object_path):
2273
 
                "D-Bus method"
2274
 
                for c in tcp_server.clients.itervalues():
2275
 
                    if c.dbus_object_path == object_path:
2276
 
                        del tcp_server.clients[c.name]
2277
 
                        c.remove_from_connection()
2278
 
                        # Don't signal anything except ClientRemoved
2279
 
                        c.disable(quiet=True)
2280
 
                        # Emit D-Bus signal
2281
 
                        self.ClientRemoved(object_path, c.name)
2282
 
                        return
2283
 
                raise KeyError(object_path)
2284
 
            
2285
 
            del _interface
2286
 
        
2287
 
        class MandosDBusServiceTransitional(MandosDBusService):
2288
 
            __metaclass__ = AlternateDBusNamesMetaclass
2289
 
        mandos_dbus_service = MandosDBusServiceTransitional()
2290
 
    
2291
 
    def cleanup():
2292
 
        "Cleanup function; run on exit"
2293
 
        service.cleanup()
2294
 
        
2295
 
        multiprocessing.active_children()
2296
 
        if not (tcp_server.clients or client_settings):
2297
 
            return
2298
 
 
2299
 
        # Store client before exiting. Secrets are encrypted with key based
2300
 
        # on what config file has. If config file is removed/edited, old
2301
 
        # secret will thus be unrecovable.
2302
 
        clients = []
2303
 
        for client in tcp_server.clients.itervalues():
2304
 
            client.encrypt_secret(client_settings[client.name]["secret"])
2305
 
 
2306
 
            client_dict = {}
2307
 
 
2308
 
            # A list of attributes that will not be stored when shuting down.
2309
 
            exclude = set(("bus", "changedstate", "secret"))            
2310
 
            for name, typ in inspect.getmembers(dbus.service.Object):
2311
 
                exclude.add(name)
2312
 
                
2313
 
            client_dict["encrypted_secret"] = client.encrypted_secret
2314
 
            for attr in client.client_structure:
2315
 
                if attr not in exclude:
2316
 
                    client_dict[attr] = getattr(client, attr)
2317
 
 
2318
 
            clients.append(client_dict) 
2319
 
            del client_settings[client.name]["secret"]
2320
 
            
2321
 
        try:
2322
 
            with os.fdopen(os.open(stored_state_path, os.O_CREAT|os.O_WRONLY|os.O_TRUNC, 0600), "wb") as stored_state:
2323
 
                pickle.dump((clients, client_settings), stored_state)
2324
 
        except IOError as e:
2325
 
            logger.warning("Could not save persistant state: {0}".format(e))
2326
 
            if e.errno != errno.ENOENT:
2327
 
                raise
2328
 
 
2329
 
        # Delete all clients, and settings from config
2330
 
        while tcp_server.clients:
2331
 
            name, client = tcp_server.clients.popitem()
2332
 
            if use_dbus:
2333
 
                client.remove_from_connection()
2334
 
            # Don't signal anything except ClientRemoved
2335
 
            client.disable(quiet=True)
2336
 
            if use_dbus:
2337
 
                # Emit D-Bus signal
2338
 
                mandos_dbus_service.ClientRemoved(client
2339
 
                                                  .dbus_object_path,
2340
 
                                                  client.name)
2341
 
        client_settings.clear()
2342
 
    
2343
 
    atexit.register(cleanup)
2344
 
    
2345
 
    for client in tcp_server.clients.itervalues():
2346
 
        if use_dbus:
2347
 
            # Emit D-Bus signal
2348
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2349
 
        # Need to initiate checking of clients
2350
 
        if client.enabled:
2351
 
            client.init_checker()
2352
 
 
2353
 
    
2354
 
    tcp_server.enable()
2355
 
    tcp_server.server_activate()
2356
 
    
2357
 
    # Find out what port we got
2358
 
    service.port = tcp_server.socket.getsockname()[1]
2359
 
    if use_ipv6:
2360
 
        logger.info("Now listening on address %r, port %d,"
2361
 
                    " flowinfo %d, scope_id %d"
2362
 
                    % tcp_server.socket.getsockname())
2363
 
    else:                       # IPv4
2364
 
        logger.info("Now listening on address %r, port %d"
2365
 
                    % tcp_server.socket.getsockname())
2366
 
    
2367
 
    #service.interface = tcp_server.socket.getsockname()[3]
2368
 
    
 
592
    server = dbus.Interface(
 
593
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
594
            avahi.DBUS_INTERFACE_SERVER )
 
595
    # End of Avahi example code
 
596
    
 
597
    debug = options.debug
 
598
    
 
599
    clients = Set()
 
600
    def remove_from_clients(client):
 
601
        clients.remove(client)
 
602
        if not clients:
 
603
            logger.debug(u"No clients left, exiting")
 
604
            main_loop.quit()
 
605
    
 
606
    clients.update(Set(Client(name=section, options=options,
 
607
                              stop_hook = remove_from_clients,
 
608
                              **(dict(client_config\
 
609
                                      .items(section))))
 
610
                       for section in client_config.sections()))
 
611
    for client in clients:
 
612
        client.start()
 
613
    
 
614
    tcp_server = IPv6_TCPServer((None, options.port),
 
615
                                tcp_handler,
 
616
                                options=options,
 
617
                                clients=clients)
 
618
    # Find out what random port we got
 
619
    servicePort = tcp_server.socket.getsockname()[1]
 
620
    logger.debug(u"Now listening on port %d", servicePort)
 
621
    
 
622
    if options.interface is not None:
 
623
        serviceInterface = if_nametoindex(options.interface)
 
624
    
 
625
    # From the Avahi server example code
 
626
    server.connect_to_signal("StateChanged", server_state_changed)
 
627
    server_state_changed(server.GetState())
 
628
    # End of Avahi example code
 
629
    
 
630
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
631
                         lambda *args, **kwargs:
 
632
                         tcp_server.handle_request(*args[2:],
 
633
                                                   **kwargs) or True)
2369
634
    try:
2370
 
        # From the Avahi example code
2371
 
        try:
2372
 
            service.activate()
2373
 
        except dbus.exceptions.DBusException as error:
2374
 
            logger.critical("DBusException: %s", error)
2375
 
            cleanup()
2376
 
            sys.exit(1)
2377
 
        # End of Avahi example code
2378
 
        
2379
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2380
 
                             lambda *args, **kwargs:
2381
 
                             (tcp_server.handle_request
2382
 
                              (*args[2:], **kwargs) or True))
2383
 
        
2384
 
        logger.debug("Starting main loop")
2385
635
        main_loop.run()
2386
 
    except AvahiError as error:
2387
 
        logger.critical("AvahiError: %s", error)
2388
 
        cleanup()
2389
 
        sys.exit(1)
2390
636
    except KeyboardInterrupt:
2391
 
        if debug:
2392
 
            print("", file=sys.stderr)
2393
 
        logger.debug("Server received KeyboardInterrupt")
2394
 
    logger.debug("Server exiting")
2395
 
    # Must run before the D-Bus bus name gets deregistered
2396
 
    cleanup()
2397
 
 
2398
 
 
2399
 
if __name__ == '__main__':
2400
 
    main()
 
637
        print
 
638
    
 
639
    # Cleanup here
 
640
 
 
641
    # From the Avahi server example code
 
642
    if not group is None:
 
643
        group.Free()
 
644
    # End of Avahi example code
 
645
    
 
646
    for client in clients:
 
647
        client.stop_hook = None
 
648
        client.stop()