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  • Committer: Teddy Hogeborn
  • Date: 2011-04-02 06:37:18 UTC
  • Revision ID: teddy@fukt.bsnet.se-20110402063718-13ldrcuu0t33sdc4
* mandos: Tolerate restarting Avahi servers.  Also Changed to new
          "except x as y" exception syntax.
  (AvahiService.entry_group_state_changed_match): New; contains the
                                                  SignalMatch object.
  (AvahiService.remove): Really remove the group and the signal
                         connection, if any.
  (AvahiService.add): Always create a new group and signal connection.
  (AvahiService.cleanup): Changed to simply call remove().
  (AvahiService.server_state_changed): Handle and log more bad states.
  (AvahiService.activate): Set "follow_name_owner_changes=True" on the
                           Avahi Server proxy object.
  (ClientDBus.checked_ok): Do not return anything.
  (ClientDBus.CheckedOK): Do not return anything, as documented.
* mandos-monitor: Call D-Bus methods asynchronously.

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Lines of Context:
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# This program is partly derived from an example program for an Avahi
7
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# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
 
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
12
13
13
# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
14
# Copyright © 2008-2011 Teddy Hogeborn
 
15
# Copyright © 2008-2011 Björn Påhlsson
15
16
16
17
# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
24
25
#     GNU General Public License for more details.
25
26
26
27
# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
28
# along with this program.  If not, see
 
29
# <http://www.gnu.org/licenses/>.
28
30
29
31
# Contact the authors at <mandos@fukt.bsnet.se>.
30
32
31
33
 
32
 
from __future__ import division
 
34
from __future__ import (division, absolute_import, print_function,
 
35
                        unicode_literals)
33
36
 
34
 
import SocketServer
 
37
import SocketServer as socketserver
35
38
import socket
36
 
import select
37
 
from optparse import OptionParser
 
39
import argparse
38
40
import datetime
39
41
import errno
40
42
import gnutls.crypto
43
45
import gnutls.library.functions
44
46
import gnutls.library.constants
45
47
import gnutls.library.types
46
 
import ConfigParser
 
48
import ConfigParser as configparser
47
49
import sys
48
50
import re
49
51
import os
50
52
import signal
51
 
from sets import Set
52
53
import subprocess
53
54
import atexit
54
55
import stat
55
56
import logging
56
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
57
65
 
58
66
import dbus
 
67
import dbus.service
59
68
import gobject
60
69
import avahi
61
70
from dbus.mainloop.glib import DBusGMainLoop
62
71
import ctypes
63
 
 
64
 
version = "1.0"
65
 
 
 
72
import ctypes.util
 
73
import xml.dom.minidom
 
74
import inspect
 
75
 
 
76
try:
 
77
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
78
except AttributeError:
 
79
    try:
 
80
        from IN import SO_BINDTODEVICE
 
81
    except ImportError:
 
82
        SO_BINDTODEVICE = None
 
83
 
 
84
 
 
85
version = "1.3.0"
 
86
 
 
87
#logger = logging.getLogger('mandos')
66
88
logger = logging.Logger('mandos')
67
 
syslogger = logging.handlers.SysLogHandler\
68
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
 
             address = "/dev/log")
70
 
syslogger.setFormatter(logging.Formatter\
71
 
                        ('Mandos: %(levelname)s: %(message)s'))
 
89
syslogger = (logging.handlers.SysLogHandler
 
90
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
91
              address = str("/dev/log")))
 
92
syslogger.setFormatter(logging.Formatter
 
93
                       ('Mandos [%(process)d]: %(levelname)s:'
 
94
                        ' %(message)s'))
72
95
logger.addHandler(syslogger)
73
96
 
74
97
console = logging.StreamHandler()
75
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
 
98
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
 
99
                                       ' %(levelname)s:'
76
100
                                       ' %(message)s'))
77
101
logger.addHandler(console)
78
102
 
79
103
class AvahiError(Exception):
80
 
    def __init__(self, value):
 
104
    def __init__(self, value, *args, **kwargs):
81
105
        self.value = value
82
 
    def __str__(self):
83
 
        return repr(self.value)
 
106
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
107
    def __unicode__(self):
 
108
        return unicode(repr(self.value))
84
109
 
85
110
class AvahiServiceError(AvahiError):
86
111
    pass
91
116
 
92
117
class AvahiService(object):
93
118
    """An Avahi (Zeroconf) service.
 
119
    
94
120
    Attributes:
95
121
    interface: integer; avahi.IF_UNSPEC or an interface index.
96
122
               Used to optionally bind to the specified interface.
104
130
    max_renames: integer; maximum number of renames
105
131
    rename_count: integer; counter so we only rename after collisions
106
132
                  a sensible number of times
 
133
    group: D-Bus Entry Group
 
134
    server: D-Bus Server
 
135
    bus: dbus.SystemBus()
107
136
    """
108
137
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
 
                 type = None, port = None, TXT = None, domain = "",
110
 
                 host = "", max_renames = 32768):
 
138
                 servicetype = None, port = None, TXT = None,
 
139
                 domain = "", host = "", max_renames = 32768,
 
140
                 protocol = avahi.PROTO_UNSPEC, bus = None):
111
141
        self.interface = interface
112
142
        self.name = name
113
 
        self.type = type
 
143
        self.type = servicetype
114
144
        self.port = port
115
 
        if TXT is None:
116
 
            self.TXT = []
117
 
        else:
118
 
            self.TXT = TXT
 
145
        self.TXT = TXT if TXT is not None else []
119
146
        self.domain = domain
120
147
        self.host = host
121
148
        self.rename_count = 0
 
149
        self.max_renames = max_renames
 
150
        self.protocol = protocol
 
151
        self.group = None       # our entry group
 
152
        self.server = None
 
153
        self.bus = bus
 
154
        self.entry_group_state_changed_match = None
122
155
    def rename(self):
123
156
        """Derived from the Avahi example code"""
124
157
        if self.rename_count >= self.max_renames:
125
 
            logger.critical(u"No suitable service name found after %i"
126
 
                            u" retries, exiting.", rename_count)
 
158
            logger.critical("No suitable Zeroconf service name found"
 
159
                            " after %i retries, exiting.",
 
160
                            self.rename_count)
127
161
            raise AvahiServiceError("Too many renames")
128
 
        name = server.GetAlternativeServiceName(name)
129
 
        logger.error(u"Changing name to %r ...", name)
130
 
        syslogger.setFormatter(logging.Formatter\
131
 
                               ('Mandos (%s): %%(levelname)s:'
132
 
                               ' %%(message)s' % name))
 
162
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
 
163
        logger.info("Changing Zeroconf service name to %r ...",
 
164
                    self.name)
 
165
        syslogger.setFormatter(logging.Formatter
 
166
                               ('Mandos (%s) [%%(process)d]:'
 
167
                                ' %%(levelname)s: %%(message)s'
 
168
                                % self.name))
133
169
        self.remove()
134
 
        self.add()
 
170
        try:
 
171
            self.add()
 
172
        except dbus.exceptions.DBusException as error:
 
173
            logger.critical("DBusException: %s", error)
 
174
            self.cleanup()
 
175
            os._exit(1)
135
176
        self.rename_count += 1
136
177
    def remove(self):
137
178
        """Derived from the Avahi example code"""
138
 
        if group is not None:
139
 
            group.Reset()
 
179
        if self.group is not None:
 
180
            try:
 
181
                self.group.Free()
 
182
            except (dbus.exceptions.UnknownMethodException,
 
183
                    dbus.exceptions.DBusException) as e:
 
184
                pass
 
185
            self.group = None
 
186
        if self.entry_group_state_changed_match is not None:
 
187
            self.entry_group_state_changed_match.remove()
 
188
            self.entry_group_state_changed_match = None
140
189
    def add(self):
141
190
        """Derived from the Avahi example code"""
142
 
        global group
143
 
        if group is None:
144
 
            group = dbus.Interface\
145
 
                    (bus.get_object(avahi.DBUS_NAME,
146
 
                                    server.EntryGroupNew()),
147
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
148
 
            group.connect_to_signal('StateChanged',
149
 
                                    entry_group_state_changed)
150
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
151
 
                     service.name, service.type)
152
 
        group.AddService(
153
 
                self.interface,         # interface
154
 
                avahi.PROTO_INET6,      # protocol
155
 
                dbus.UInt32(0),         # flags
156
 
                self.name, self.type,
157
 
                self.domain, self.host,
158
 
                dbus.UInt16(self.port),
159
 
                avahi.string_array_to_txt_array(self.TXT))
160
 
        group.Commit()
161
 
 
162
 
# From the Avahi example code:
163
 
group = None                            # our entry group
164
 
# End of Avahi example code
 
191
        self.remove()
 
192
        self.group = dbus.Interface(
 
193
            self.bus.get_object(avahi.DBUS_NAME,
 
194
                                self.server.EntryGroupNew(),
 
195
                                follow_name_owner_changes=True),
 
196
            avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
197
        self.entry_group_state_changed_match = (
 
198
            self.group.connect_to_signal(
 
199
                'StateChanged', self .entry_group_state_changed))
 
200
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
 
201
                     self.name, self.type)
 
202
        self.group.AddService(
 
203
            self.interface,
 
204
            self.protocol,
 
205
            dbus.UInt32(0),     # flags
 
206
            self.name, self.type,
 
207
            self.domain, self.host,
 
208
            dbus.UInt16(self.port),
 
209
            avahi.string_array_to_txt_array(self.TXT))
 
210
        self.group.Commit()
 
211
    def entry_group_state_changed(self, state, error):
 
212
        """Derived from the Avahi example code"""
 
213
        logger.debug("Avahi entry group state change: %i", state)
 
214
        
 
215
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
216
            logger.debug("Zeroconf service established.")
 
217
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
218
            logger.info("Zeroconf service name collision.")
 
219
            self.rename()
 
220
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
221
            logger.critical("Avahi: Error in group state changed %s",
 
222
                            unicode(error))
 
223
            raise AvahiGroupError("State changed: %s"
 
224
                                  % unicode(error))
 
225
    def cleanup(self):
 
226
        """Derived from the Avahi example code"""
 
227
        self.remove()
 
228
    def server_state_changed(self, state, error=None):
 
229
        """Derived from the Avahi example code"""
 
230
        logger.debug("Avahi server state change: %i", state)
 
231
        bad_states = { avahi.SERVER_INVALID:
 
232
                           "Zeroconf server invalid",
 
233
                       avahi.SERVER_REGISTERING: None,
 
234
                       avahi.SERVER_COLLISION:
 
235
                           "Zeroconf server name collision",
 
236
                       avahi.SERVER_FAILURE:
 
237
                           "Zeroconf server failure" }
 
238
        if state in bad_states:
 
239
            if bad_states[state]:
 
240
                logger.error(bad_states[state])
 
241
            self.remove()
 
242
        elif state == avahi.SERVER_RUNNING:
 
243
            self.add()
 
244
        else:
 
245
            logger.debug("Unknown state: %r", state)
 
246
    def activate(self):
 
247
        """Derived from the Avahi example code"""
 
248
        if self.server is None:
 
249
            self.server = dbus.Interface(
 
250
                self.bus.get_object(avahi.DBUS_NAME,
 
251
                                    avahi.DBUS_PATH_SERVER,
 
252
                                    follow_name_owner_changes=True),
 
253
                avahi.DBUS_INTERFACE_SERVER)
 
254
        self.server.connect_to_signal("StateChanged",
 
255
                                 self.server_state_changed)
 
256
        self.server_state_changed(self.server.GetState())
165
257
 
166
258
 
167
259
class Client(object):
168
260
    """A representation of a client host served by this server.
 
261
    
169
262
    Attributes:
170
 
    name:      string; from the config file, used in log messages
 
263
    _approved:   bool(); 'None' if not yet approved/disapproved
 
264
    approval_delay: datetime.timedelta(); Time to wait for approval
 
265
    approval_duration: datetime.timedelta(); Duration of one approval
 
266
    checker:    subprocess.Popen(); a running checker process used
 
267
                                    to see if the client lives.
 
268
                                    'None' if no process is running.
 
269
    checker_callback_tag: a gobject event source tag, or None
 
270
    checker_command: string; External command which is run to check
 
271
                     if client lives.  %() expansions are done at
 
272
                     runtime with vars(self) as dict, so that for
 
273
                     instance %(name)s can be used in the command.
 
274
    checker_initiator_tag: a gobject event source tag, or None
 
275
    created:    datetime.datetime(); (UTC) object creation
 
276
    current_checker_command: string; current running checker_command
 
277
    disable_hook:  If set, called by disable() as disable_hook(self)
 
278
    disable_initiator_tag: a gobject event source tag, or None
 
279
    enabled:    bool()
171
280
    fingerprint: string (40 or 32 hexadecimal digits); used to
172
281
                 uniquely identify the client
173
 
    secret:    bytestring; sent verbatim (over TLS) to client
174
 
    host:      string; available for use by the checker command
175
 
    created:   datetime.datetime(); object creation, not client host
176
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
177
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
178
 
                                     until this client is invalid
179
 
    interval:  datetime.timedelta(); How often to start a new checker
180
 
    stop_hook: If set, called by stop() as stop_hook(self)
181
 
    checker:   subprocess.Popen(); a running checker process used
182
 
                                   to see if the client lives.
183
 
                                   'None' if no process is running.
184
 
    checker_initiator_tag: a gobject event source tag, or None
185
 
    stop_initiator_tag:    - '' -
186
 
    checker_callback_tag:  - '' -
187
 
    checker_command: string; External command which is run to check if
188
 
                     client lives.  %() expansions are done at
189
 
                     runtime with vars(self) as dict, so that for
190
 
                     instance %(name)s can be used in the command.
191
 
    Private attibutes:
192
 
    _timeout: Real variable for 'timeout'
193
 
    _interval: Real variable for 'interval'
194
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
195
 
    _interval_milliseconds: - '' -
 
282
    host:       string; available for use by the checker command
 
283
    interval:   datetime.timedelta(); How often to start a new checker
 
284
    last_approval_request: datetime.datetime(); (UTC) or None
 
285
    last_checked_ok: datetime.datetime(); (UTC) or None
 
286
    last_enabled: datetime.datetime(); (UTC)
 
287
    name:       string; from the config file, used in log messages and
 
288
                        D-Bus identifiers
 
289
    secret:     bytestring; sent verbatim (over TLS) to client
 
290
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
291
                                      until this client is disabled
 
292
    runtime_expansions: Allowed attributes for runtime expansion.
196
293
    """
197
 
    def _set_timeout(self, timeout):
198
 
        "Setter function for 'timeout' attribute"
199
 
        self._timeout = timeout
200
 
        self._timeout_milliseconds = ((self.timeout.days
201
 
                                       * 24 * 60 * 60 * 1000)
202
 
                                      + (self.timeout.seconds * 1000)
203
 
                                      + (self.timeout.microseconds
204
 
                                         // 1000))
205
 
    timeout = property(lambda self: self._timeout,
206
 
                       _set_timeout)
207
 
    del _set_timeout
208
 
    def _set_interval(self, interval):
209
 
        "Setter function for 'interval' attribute"
210
 
        self._interval = interval
211
 
        self._interval_milliseconds = ((self.interval.days
212
 
                                        * 24 * 60 * 60 * 1000)
213
 
                                       + (self.interval.seconds
214
 
                                          * 1000)
215
 
                                       + (self.interval.microseconds
216
 
                                          // 1000))
217
 
    interval = property(lambda self: self._interval,
218
 
                        _set_interval)
219
 
    del _set_interval
220
 
    def __init__(self, name = None, stop_hook=None, config={}):
 
294
    
 
295
    runtime_expansions = ("approval_delay", "approval_duration",
 
296
                          "created", "enabled", "fingerprint",
 
297
                          "host", "interval", "last_checked_ok",
 
298
                          "last_enabled", "name", "timeout")
 
299
    
 
300
    @staticmethod
 
301
    def _timedelta_to_milliseconds(td):
 
302
        "Convert a datetime.timedelta() to milliseconds"
 
303
        return ((td.days * 24 * 60 * 60 * 1000)
 
304
                + (td.seconds * 1000)
 
305
                + (td.microseconds // 1000))
 
306
    
 
307
    def timeout_milliseconds(self):
 
308
        "Return the 'timeout' attribute in milliseconds"
 
309
        return self._timedelta_to_milliseconds(self.timeout)
 
310
    
 
311
    def interval_milliseconds(self):
 
312
        "Return the 'interval' attribute in milliseconds"
 
313
        return self._timedelta_to_milliseconds(self.interval)
 
314
 
 
315
    def approval_delay_milliseconds(self):
 
316
        return self._timedelta_to_milliseconds(self.approval_delay)
 
317
    
 
318
    def __init__(self, name = None, disable_hook=None, config=None):
221
319
        """Note: the 'checker' key in 'config' sets the
222
320
        'checker_command' attribute and *not* the 'checker'
223
321
        attribute."""
224
322
        self.name = name
225
 
        logger.debug(u"Creating client %r", self.name)
 
323
        if config is None:
 
324
            config = {}
 
325
        logger.debug("Creating client %r", self.name)
226
326
        # Uppercase and remove spaces from fingerprint for later
227
327
        # comparison purposes with return value from the fingerprint()
228
328
        # function
229
 
        self.fingerprint = config["fingerprint"].upper()\
230
 
                           .replace(u" ", u"")
231
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
329
        self.fingerprint = (config["fingerprint"].upper()
 
330
                            .replace(" ", ""))
 
331
        logger.debug("  Fingerprint: %s", self.fingerprint)
232
332
        if "secret" in config:
233
 
            self.secret = config["secret"].decode(u"base64")
 
333
            self.secret = config["secret"].decode("base64")
234
334
        elif "secfile" in config:
235
 
            sf = open(config["secfile"])
236
 
            self.secret = sf.read()
237
 
            sf.close()
 
335
            with open(os.path.expanduser(os.path.expandvars
 
336
                                         (config["secfile"])),
 
337
                      "rb") as secfile:
 
338
                self.secret = secfile.read()
238
339
        else:
239
 
            raise TypeError(u"No secret or secfile for client %s"
 
340
            raise TypeError("No secret or secfile for client %s"
240
341
                            % self.name)
241
342
        self.host = config.get("host", "")
242
 
        self.created = datetime.datetime.now()
 
343
        self.created = datetime.datetime.utcnow()
 
344
        self.enabled = False
 
345
        self.last_approval_request = None
 
346
        self.last_enabled = None
243
347
        self.last_checked_ok = None
244
348
        self.timeout = string_to_delta(config["timeout"])
245
349
        self.interval = string_to_delta(config["interval"])
246
 
        self.stop_hook = stop_hook
 
350
        self.disable_hook = disable_hook
247
351
        self.checker = None
248
352
        self.checker_initiator_tag = None
249
 
        self.stop_initiator_tag = None
 
353
        self.disable_initiator_tag = None
250
354
        self.checker_callback_tag = None
251
 
        self.check_command = config["checker"]
252
 
    def start(self):
 
355
        self.checker_command = config["checker"]
 
356
        self.current_checker_command = None
 
357
        self.last_connect = None
 
358
        self._approved = None
 
359
        self.approved_by_default = config.get("approved_by_default",
 
360
                                              True)
 
361
        self.approvals_pending = 0
 
362
        self.approval_delay = string_to_delta(
 
363
            config["approval_delay"])
 
364
        self.approval_duration = string_to_delta(
 
365
            config["approval_duration"])
 
366
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
 
367
    
 
368
    def send_changedstate(self):
 
369
        self.changedstate.acquire()
 
370
        self.changedstate.notify_all()
 
371
        self.changedstate.release()
 
372
        
 
373
    def enable(self):
253
374
        """Start this client's checker and timeout hooks"""
 
375
        if getattr(self, "enabled", False):
 
376
            # Already enabled
 
377
            return
 
378
        self.send_changedstate()
 
379
        self.last_enabled = datetime.datetime.utcnow()
254
380
        # Schedule a new checker to be started an 'interval' from now,
255
381
        # and every interval from then on.
256
 
        self.checker_initiator_tag = gobject.timeout_add\
257
 
                                     (self._interval_milliseconds,
258
 
                                      self.start_checker)
 
382
        self.checker_initiator_tag = (gobject.timeout_add
 
383
                                      (self.interval_milliseconds(),
 
384
                                       self.start_checker))
 
385
        # Schedule a disable() when 'timeout' has passed
 
386
        self.disable_initiator_tag = (gobject.timeout_add
 
387
                                   (self.timeout_milliseconds(),
 
388
                                    self.disable))
 
389
        self.enabled = True
259
390
        # Also start a new checker *right now*.
260
391
        self.start_checker()
261
 
        # Schedule a stop() when 'timeout' has passed
262
 
        self.stop_initiator_tag = gobject.timeout_add\
263
 
                                  (self._timeout_milliseconds,
264
 
                                   self.stop)
265
 
    def stop(self):
266
 
        """Stop this client.
267
 
        The possibility that a client might be restarted is left open,
268
 
        but not currently used."""
269
 
        # If this client doesn't have a secret, it is already stopped.
270
 
        if hasattr(self, "secret") and self.secret:
271
 
            logger.info(u"Stopping client %s", self.name)
272
 
            self.secret = None
273
 
        else:
 
392
    
 
393
    def disable(self, quiet=True):
 
394
        """Disable this client."""
 
395
        if not getattr(self, "enabled", False):
274
396
            return False
275
 
        if getattr(self, "stop_initiator_tag", False):
276
 
            gobject.source_remove(self.stop_initiator_tag)
277
 
            self.stop_initiator_tag = None
 
397
        if not quiet:
 
398
            self.send_changedstate()
 
399
        if not quiet:
 
400
            logger.info("Disabling client %s", self.name)
 
401
        if getattr(self, "disable_initiator_tag", False):
 
402
            gobject.source_remove(self.disable_initiator_tag)
 
403
            self.disable_initiator_tag = None
278
404
        if getattr(self, "checker_initiator_tag", False):
279
405
            gobject.source_remove(self.checker_initiator_tag)
280
406
            self.checker_initiator_tag = None
281
407
        self.stop_checker()
282
 
        if self.stop_hook:
283
 
            self.stop_hook(self)
 
408
        if self.disable_hook:
 
409
            self.disable_hook(self)
 
410
        self.enabled = False
284
411
        # Do not run this again if called by a gobject.timeout_add
285
412
        return False
 
413
    
286
414
    def __del__(self):
287
 
        self.stop_hook = None
288
 
        self.stop()
289
 
    def checker_callback(self, pid, condition):
 
415
        self.disable_hook = None
 
416
        self.disable()
 
417
    
 
418
    def checker_callback(self, pid, condition, command):
290
419
        """The checker has completed, so take appropriate actions."""
291
 
        now = datetime.datetime.now()
292
420
        self.checker_callback_tag = None
293
421
        self.checker = None
294
 
        if os.WIFEXITED(condition) \
295
 
               and (os.WEXITSTATUS(condition) == 0):
296
 
            logger.info(u"Checker for %(name)s succeeded",
297
 
                        vars(self))
298
 
            self.last_checked_ok = now
299
 
            gobject.source_remove(self.stop_initiator_tag)
300
 
            self.stop_initiator_tag = gobject.timeout_add\
301
 
                                      (self._timeout_milliseconds,
302
 
                                       self.stop)
303
 
        elif not os.WIFEXITED(condition):
304
 
            logger.warning(u"Checker for %(name)s crashed?",
 
422
        if os.WIFEXITED(condition):
 
423
            exitstatus = os.WEXITSTATUS(condition)
 
424
            if exitstatus == 0:
 
425
                logger.info("Checker for %(name)s succeeded",
 
426
                            vars(self))
 
427
                self.checked_ok()
 
428
            else:
 
429
                logger.info("Checker for %(name)s failed",
 
430
                            vars(self))
 
431
        else:
 
432
            logger.warning("Checker for %(name)s crashed?",
305
433
                           vars(self))
306
 
        else:
307
 
            logger.info(u"Checker for %(name)s failed",
308
 
                        vars(self))
 
434
    
 
435
    def checked_ok(self):
 
436
        """Bump up the timeout for this client.
 
437
        
 
438
        This should only be called when the client has been seen,
 
439
        alive and well.
 
440
        """
 
441
        self.last_checked_ok = datetime.datetime.utcnow()
 
442
        gobject.source_remove(self.disable_initiator_tag)
 
443
        self.disable_initiator_tag = (gobject.timeout_add
 
444
                                      (self.timeout_milliseconds(),
 
445
                                       self.disable))
 
446
    
 
447
    def need_approval(self):
 
448
        self.last_approval_request = datetime.datetime.utcnow()
 
449
    
309
450
    def start_checker(self):
310
451
        """Start a new checker subprocess if one is not running.
 
452
        
311
453
        If a checker already exists, leave it running and do
312
454
        nothing."""
313
455
        # The reason for not killing a running checker is that if we
316
458
        # client would inevitably timeout, since no checker would get
317
459
        # a chance to run to completion.  If we instead leave running
318
460
        # checkers alone, the checker would have to take more time
319
 
        # than 'timeout' for the client to be declared invalid, which
320
 
        # is as it should be.
 
461
        # than 'timeout' for the client to be disabled, which is as it
 
462
        # should be.
 
463
        
 
464
        # If a checker exists, make sure it is not a zombie
 
465
        try:
 
466
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
467
        except (AttributeError, OSError) as error:
 
468
            if (isinstance(error, OSError)
 
469
                and error.errno != errno.ECHILD):
 
470
                raise error
 
471
        else:
 
472
            if pid:
 
473
                logger.warning("Checker was a zombie")
 
474
                gobject.source_remove(self.checker_callback_tag)
 
475
                self.checker_callback(pid, status,
 
476
                                      self.current_checker_command)
 
477
        # Start a new checker if needed
321
478
        if self.checker is None:
322
479
            try:
323
 
                # In case check_command has exactly one % operator
324
 
                command = self.check_command % self.host
 
480
                # In case checker_command has exactly one % operator
 
481
                command = self.checker_command % self.host
325
482
            except TypeError:
326
483
                # Escape attributes for the shell
327
 
                escaped_attrs = dict((key, re.escape(str(val)))
328
 
                                     for key, val in
329
 
                                     vars(self).iteritems())
 
484
                escaped_attrs = dict(
 
485
                    (attr,
 
486
                     re.escape(unicode(str(getattr(self, attr, "")),
 
487
                                       errors=
 
488
                                       'replace')))
 
489
                    for attr in
 
490
                    self.runtime_expansions)
 
491
 
330
492
                try:
331
 
                    command = self.check_command % escaped_attrs
332
 
                except TypeError, error:
333
 
                    logger.error(u'Could not format string "%s":'
334
 
                                 u' %s', self.check_command, error)
 
493
                    command = self.checker_command % escaped_attrs
 
494
                except TypeError as error:
 
495
                    logger.error('Could not format string "%s":'
 
496
                                 ' %s', self.checker_command, error)
335
497
                    return True # Try again later
 
498
            self.current_checker_command = command
336
499
            try:
337
 
                logger.info(u"Starting checker %r for %s",
 
500
                logger.info("Starting checker %r for %s",
338
501
                            command, self.name)
 
502
                # We don't need to redirect stdout and stderr, since
 
503
                # in normal mode, that is already done by daemon(),
 
504
                # and in debug mode we don't want to.  (Stdin is
 
505
                # always replaced by /dev/null.)
339
506
                self.checker = subprocess.Popen(command,
340
507
                                                close_fds=True,
341
508
                                                shell=True, cwd="/")
342
 
                self.checker_callback_tag = gobject.child_watch_add\
343
 
                                            (self.checker.pid,
344
 
                                             self.checker_callback)
345
 
            except subprocess.OSError, error:
346
 
                logger.error(u"Failed to start subprocess: %s",
 
509
                self.checker_callback_tag = (gobject.child_watch_add
 
510
                                             (self.checker.pid,
 
511
                                              self.checker_callback,
 
512
                                              data=command))
 
513
                # The checker may have completed before the gobject
 
514
                # watch was added.  Check for this.
 
515
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
516
                if pid:
 
517
                    gobject.source_remove(self.checker_callback_tag)
 
518
                    self.checker_callback(pid, status, command)
 
519
            except OSError as error:
 
520
                logger.error("Failed to start subprocess: %s",
347
521
                             error)
348
522
        # Re-run this periodically if run by gobject.timeout_add
349
523
        return True
 
524
    
350
525
    def stop_checker(self):
351
526
        """Force the checker process, if any, to stop."""
352
527
        if self.checker_callback_tag:
354
529
            self.checker_callback_tag = None
355
530
        if getattr(self, "checker", None) is None:
356
531
            return
357
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
532
        logger.debug("Stopping checker for %(name)s", vars(self))
358
533
        try:
359
534
            os.kill(self.checker.pid, signal.SIGTERM)
360
 
            #os.sleep(0.5)
 
535
            #time.sleep(0.5)
361
536
            #if self.checker.poll() is None:
362
537
            #    os.kill(self.checker.pid, signal.SIGKILL)
363
 
        except OSError, error:
 
538
        except OSError as error:
364
539
            if error.errno != errno.ESRCH: # No such process
365
540
                raise
366
541
        self.checker = None
367
 
    def still_valid(self):
368
 
        """Has the timeout not yet passed for this client?"""
369
 
        now = datetime.datetime.now()
 
542
 
 
543
def dbus_service_property(dbus_interface, signature="v",
 
544
                          access="readwrite", byte_arrays=False):
 
545
    """Decorators for marking methods of a DBusObjectWithProperties to
 
546
    become properties on the D-Bus.
 
547
    
 
548
    The decorated method will be called with no arguments by "Get"
 
549
    and with one argument by "Set".
 
550
    
 
551
    The parameters, where they are supported, are the same as
 
552
    dbus.service.method, except there is only "signature", since the
 
553
    type from Get() and the type sent to Set() is the same.
 
554
    """
 
555
    # Encoding deeply encoded byte arrays is not supported yet by the
 
556
    # "Set" method, so we fail early here:
 
557
    if byte_arrays and signature != "ay":
 
558
        raise ValueError("Byte arrays not supported for non-'ay'"
 
559
                         " signature %r" % signature)
 
560
    def decorator(func):
 
561
        func._dbus_is_property = True
 
562
        func._dbus_interface = dbus_interface
 
563
        func._dbus_signature = signature
 
564
        func._dbus_access = access
 
565
        func._dbus_name = func.__name__
 
566
        if func._dbus_name.endswith("_dbus_property"):
 
567
            func._dbus_name = func._dbus_name[:-14]
 
568
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
 
569
        return func
 
570
    return decorator
 
571
 
 
572
 
 
573
class DBusPropertyException(dbus.exceptions.DBusException):
 
574
    """A base class for D-Bus property-related exceptions
 
575
    """
 
576
    def __unicode__(self):
 
577
        return unicode(str(self))
 
578
 
 
579
 
 
580
class DBusPropertyAccessException(DBusPropertyException):
 
581
    """A property's access permissions disallows an operation.
 
582
    """
 
583
    pass
 
584
 
 
585
 
 
586
class DBusPropertyNotFound(DBusPropertyException):
 
587
    """An attempt was made to access a non-existing property.
 
588
    """
 
589
    pass
 
590
 
 
591
 
 
592
class DBusObjectWithProperties(dbus.service.Object):
 
593
    """A D-Bus object with properties.
 
594
 
 
595
    Classes inheriting from this can use the dbus_service_property
 
596
    decorator to expose methods as D-Bus properties.  It exposes the
 
597
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
598
    """
 
599
    
 
600
    @staticmethod
 
601
    def _is_dbus_property(obj):
 
602
        return getattr(obj, "_dbus_is_property", False)
 
603
    
 
604
    def _get_all_dbus_properties(self):
 
605
        """Returns a generator of (name, attribute) pairs
 
606
        """
 
607
        return ((prop._dbus_name, prop)
 
608
                for name, prop in
 
609
                inspect.getmembers(self, self._is_dbus_property))
 
610
    
 
611
    def _get_dbus_property(self, interface_name, property_name):
 
612
        """Returns a bound method if one exists which is a D-Bus
 
613
        property with the specified name and interface.
 
614
        """
 
615
        for name in (property_name,
 
616
                     property_name + "_dbus_property"):
 
617
            prop = getattr(self, name, None)
 
618
            if (prop is None
 
619
                or not self._is_dbus_property(prop)
 
620
                or prop._dbus_name != property_name
 
621
                or (interface_name and prop._dbus_interface
 
622
                    and interface_name != prop._dbus_interface)):
 
623
                continue
 
624
            return prop
 
625
        # No such property
 
626
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
 
627
                                   + interface_name + "."
 
628
                                   + property_name)
 
629
    
 
630
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
 
631
                         out_signature="v")
 
632
    def Get(self, interface_name, property_name):
 
633
        """Standard D-Bus property Get() method, see D-Bus standard.
 
634
        """
 
635
        prop = self._get_dbus_property(interface_name, property_name)
 
636
        if prop._dbus_access == "write":
 
637
            raise DBusPropertyAccessException(property_name)
 
638
        value = prop()
 
639
        if not hasattr(value, "variant_level"):
 
640
            return value
 
641
        return type(value)(value, variant_level=value.variant_level+1)
 
642
    
 
643
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
 
644
    def Set(self, interface_name, property_name, value):
 
645
        """Standard D-Bus property Set() method, see D-Bus standard.
 
646
        """
 
647
        prop = self._get_dbus_property(interface_name, property_name)
 
648
        if prop._dbus_access == "read":
 
649
            raise DBusPropertyAccessException(property_name)
 
650
        if prop._dbus_get_args_options["byte_arrays"]:
 
651
            # The byte_arrays option is not supported yet on
 
652
            # signatures other than "ay".
 
653
            if prop._dbus_signature != "ay":
 
654
                raise ValueError
 
655
            value = dbus.ByteArray(''.join(unichr(byte)
 
656
                                           for byte in value))
 
657
        prop(value)
 
658
    
 
659
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
 
660
                         out_signature="a{sv}")
 
661
    def GetAll(self, interface_name):
 
662
        """Standard D-Bus property GetAll() method, see D-Bus
 
663
        standard.
 
664
 
 
665
        Note: Will not include properties with access="write".
 
666
        """
 
667
        all = {}
 
668
        for name, prop in self._get_all_dbus_properties():
 
669
            if (interface_name
 
670
                and interface_name != prop._dbus_interface):
 
671
                # Interface non-empty but did not match
 
672
                continue
 
673
            # Ignore write-only properties
 
674
            if prop._dbus_access == "write":
 
675
                continue
 
676
            value = prop()
 
677
            if not hasattr(value, "variant_level"):
 
678
                all[name] = value
 
679
                continue
 
680
            all[name] = type(value)(value, variant_level=
 
681
                                    value.variant_level+1)
 
682
        return dbus.Dictionary(all, signature="sv")
 
683
    
 
684
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
685
                         out_signature="s",
 
686
                         path_keyword='object_path',
 
687
                         connection_keyword='connection')
 
688
    def Introspect(self, object_path, connection):
 
689
        """Standard D-Bus method, overloaded to insert property tags.
 
690
        """
 
691
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
692
                                                   connection)
 
693
        try:
 
694
            document = xml.dom.minidom.parseString(xmlstring)
 
695
            def make_tag(document, name, prop):
 
696
                e = document.createElement("property")
 
697
                e.setAttribute("name", name)
 
698
                e.setAttribute("type", prop._dbus_signature)
 
699
                e.setAttribute("access", prop._dbus_access)
 
700
                return e
 
701
            for if_tag in document.getElementsByTagName("interface"):
 
702
                for tag in (make_tag(document, name, prop)
 
703
                            for name, prop
 
704
                            in self._get_all_dbus_properties()
 
705
                            if prop._dbus_interface
 
706
                            == if_tag.getAttribute("name")):
 
707
                    if_tag.appendChild(tag)
 
708
                # Add the names to the return values for the
 
709
                # "org.freedesktop.DBus.Properties" methods
 
710
                if (if_tag.getAttribute("name")
 
711
                    == "org.freedesktop.DBus.Properties"):
 
712
                    for cn in if_tag.getElementsByTagName("method"):
 
713
                        if cn.getAttribute("name") == "Get":
 
714
                            for arg in cn.getElementsByTagName("arg"):
 
715
                                if (arg.getAttribute("direction")
 
716
                                    == "out"):
 
717
                                    arg.setAttribute("name", "value")
 
718
                        elif cn.getAttribute("name") == "GetAll":
 
719
                            for arg in cn.getElementsByTagName("arg"):
 
720
                                if (arg.getAttribute("direction")
 
721
                                    == "out"):
 
722
                                    arg.setAttribute("name", "props")
 
723
            xmlstring = document.toxml("utf-8")
 
724
            document.unlink()
 
725
        except (AttributeError, xml.dom.DOMException,
 
726
                xml.parsers.expat.ExpatError) as error:
 
727
            logger.error("Failed to override Introspection method",
 
728
                         error)
 
729
        return xmlstring
 
730
 
 
731
 
 
732
class ClientDBus(Client, DBusObjectWithProperties):
 
733
    """A Client class using D-Bus
 
734
    
 
735
    Attributes:
 
736
    dbus_object_path: dbus.ObjectPath
 
737
    bus: dbus.SystemBus()
 
738
    """
 
739
    
 
740
    runtime_expansions = (Client.runtime_expansions
 
741
                          + ("dbus_object_path",))
 
742
    
 
743
    # dbus.service.Object doesn't use super(), so we can't either.
 
744
    
 
745
    def __init__(self, bus = None, *args, **kwargs):
 
746
        self._approvals_pending = 0
 
747
        self.bus = bus
 
748
        Client.__init__(self, *args, **kwargs)
 
749
        # Only now, when this client is initialized, can it show up on
 
750
        # the D-Bus
 
751
        client_object_name = unicode(self.name).translate(
 
752
            {ord("."): ord("_"),
 
753
             ord("-"): ord("_")})
 
754
        self.dbus_object_path = (dbus.ObjectPath
 
755
                                 ("/clients/" + client_object_name))
 
756
        DBusObjectWithProperties.__init__(self, self.bus,
 
757
                                          self.dbus_object_path)
 
758
        
 
759
    def _get_approvals_pending(self):
 
760
        return self._approvals_pending
 
761
    def _set_approvals_pending(self, value):
 
762
        old_value = self._approvals_pending
 
763
        self._approvals_pending = value
 
764
        bval = bool(value)
 
765
        if (hasattr(self, "dbus_object_path")
 
766
            and bval is not bool(old_value)):
 
767
            dbus_bool = dbus.Boolean(bval, variant_level=1)
 
768
            self.PropertyChanged(dbus.String("ApprovalPending"),
 
769
                                 dbus_bool)
 
770
 
 
771
    approvals_pending = property(_get_approvals_pending,
 
772
                                 _set_approvals_pending)
 
773
    del _get_approvals_pending, _set_approvals_pending
 
774
    
 
775
    @staticmethod
 
776
    def _datetime_to_dbus(dt, variant_level=0):
 
777
        """Convert a UTC datetime.datetime() to a D-Bus type."""
 
778
        return dbus.String(dt.isoformat(),
 
779
                           variant_level=variant_level)
 
780
    
 
781
    def enable(self):
 
782
        oldstate = getattr(self, "enabled", False)
 
783
        r = Client.enable(self)
 
784
        if oldstate != self.enabled:
 
785
            # Emit D-Bus signals
 
786
            self.PropertyChanged(dbus.String("Enabled"),
 
787
                                 dbus.Boolean(True, variant_level=1))
 
788
            self.PropertyChanged(
 
789
                dbus.String("LastEnabled"),
 
790
                self._datetime_to_dbus(self.last_enabled,
 
791
                                       variant_level=1))
 
792
        return r
 
793
    
 
794
    def disable(self, quiet = False):
 
795
        oldstate = getattr(self, "enabled", False)
 
796
        r = Client.disable(self, quiet=quiet)
 
797
        if not quiet and oldstate != self.enabled:
 
798
            # Emit D-Bus signal
 
799
            self.PropertyChanged(dbus.String("Enabled"),
 
800
                                 dbus.Boolean(False, variant_level=1))
 
801
        return r
 
802
    
 
803
    def __del__(self, *args, **kwargs):
 
804
        try:
 
805
            self.remove_from_connection()
 
806
        except LookupError:
 
807
            pass
 
808
        if hasattr(DBusObjectWithProperties, "__del__"):
 
809
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
810
        Client.__del__(self, *args, **kwargs)
 
811
    
 
812
    def checker_callback(self, pid, condition, command,
 
813
                         *args, **kwargs):
 
814
        self.checker_callback_tag = None
 
815
        self.checker = None
 
816
        # Emit D-Bus signal
 
817
        self.PropertyChanged(dbus.String("CheckerRunning"),
 
818
                             dbus.Boolean(False, variant_level=1))
 
819
        if os.WIFEXITED(condition):
 
820
            exitstatus = os.WEXITSTATUS(condition)
 
821
            # Emit D-Bus signal
 
822
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
823
                                  dbus.Int64(condition),
 
824
                                  dbus.String(command))
 
825
        else:
 
826
            # Emit D-Bus signal
 
827
            self.CheckerCompleted(dbus.Int16(-1),
 
828
                                  dbus.Int64(condition),
 
829
                                  dbus.String(command))
 
830
        
 
831
        return Client.checker_callback(self, pid, condition, command,
 
832
                                       *args, **kwargs)
 
833
    
 
834
    def checked_ok(self, *args, **kwargs):
 
835
        Client.checked_ok(self, *args, **kwargs)
 
836
        # Emit D-Bus signal
 
837
        self.PropertyChanged(
 
838
            dbus.String("LastCheckedOK"),
 
839
            (self._datetime_to_dbus(self.last_checked_ok,
 
840
                                    variant_level=1)))
 
841
    
 
842
    def need_approval(self, *args, **kwargs):
 
843
        r = Client.need_approval(self, *args, **kwargs)
 
844
        # Emit D-Bus signal
 
845
        self.PropertyChanged(
 
846
            dbus.String("LastApprovalRequest"),
 
847
            (self._datetime_to_dbus(self.last_approval_request,
 
848
                                    variant_level=1)))
 
849
        return r
 
850
    
 
851
    def start_checker(self, *args, **kwargs):
 
852
        old_checker = self.checker
 
853
        if self.checker is not None:
 
854
            old_checker_pid = self.checker.pid
 
855
        else:
 
856
            old_checker_pid = None
 
857
        r = Client.start_checker(self, *args, **kwargs)
 
858
        # Only if new checker process was started
 
859
        if (self.checker is not None
 
860
            and old_checker_pid != self.checker.pid):
 
861
            # Emit D-Bus signal
 
862
            self.CheckerStarted(self.current_checker_command)
 
863
            self.PropertyChanged(
 
864
                dbus.String("CheckerRunning"),
 
865
                dbus.Boolean(True, variant_level=1))
 
866
        return r
 
867
    
 
868
    def stop_checker(self, *args, **kwargs):
 
869
        old_checker = getattr(self, "checker", None)
 
870
        r = Client.stop_checker(self, *args, **kwargs)
 
871
        if (old_checker is not None
 
872
            and getattr(self, "checker", None) is None):
 
873
            self.PropertyChanged(dbus.String("CheckerRunning"),
 
874
                                 dbus.Boolean(False, variant_level=1))
 
875
        return r
 
876
 
 
877
    def _reset_approved(self):
 
878
        self._approved = None
 
879
        return False
 
880
    
 
881
    def approve(self, value=True):
 
882
        self.send_changedstate()
 
883
        self._approved = value
 
884
        gobject.timeout_add(self._timedelta_to_milliseconds
 
885
                            (self.approval_duration),
 
886
                            self._reset_approved)
 
887
    
 
888
    
 
889
    ## D-Bus methods, signals & properties
 
890
    _interface = "se.bsnet.fukt.Mandos.Client"
 
891
    
 
892
    ## Signals
 
893
    
 
894
    # CheckerCompleted - signal
 
895
    @dbus.service.signal(_interface, signature="nxs")
 
896
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
897
        "D-Bus signal"
 
898
        pass
 
899
    
 
900
    # CheckerStarted - signal
 
901
    @dbus.service.signal(_interface, signature="s")
 
902
    def CheckerStarted(self, command):
 
903
        "D-Bus signal"
 
904
        pass
 
905
    
 
906
    # PropertyChanged - signal
 
907
    @dbus.service.signal(_interface, signature="sv")
 
908
    def PropertyChanged(self, property, value):
 
909
        "D-Bus signal"
 
910
        pass
 
911
    
 
912
    # GotSecret - signal
 
913
    @dbus.service.signal(_interface)
 
914
    def GotSecret(self):
 
915
        """D-Bus signal
 
916
        Is sent after a successful transfer of secret from the Mandos
 
917
        server to mandos-client
 
918
        """
 
919
        pass
 
920
    
 
921
    # Rejected - signal
 
922
    @dbus.service.signal(_interface, signature="s")
 
923
    def Rejected(self, reason):
 
924
        "D-Bus signal"
 
925
        pass
 
926
    
 
927
    # NeedApproval - signal
 
928
    @dbus.service.signal(_interface, signature="tb")
 
929
    def NeedApproval(self, timeout, default):
 
930
        "D-Bus signal"
 
931
        return self.need_approval()
 
932
    
 
933
    ## Methods
 
934
    
 
935
    # Approve - method
 
936
    @dbus.service.method(_interface, in_signature="b")
 
937
    def Approve(self, value):
 
938
        self.approve(value)
 
939
    
 
940
    # CheckedOK - method
 
941
    @dbus.service.method(_interface)
 
942
    def CheckedOK(self):
 
943
        self.checked_ok()
 
944
    
 
945
    # Enable - method
 
946
    @dbus.service.method(_interface)
 
947
    def Enable(self):
 
948
        "D-Bus method"
 
949
        self.enable()
 
950
    
 
951
    # StartChecker - method
 
952
    @dbus.service.method(_interface)
 
953
    def StartChecker(self):
 
954
        "D-Bus method"
 
955
        self.start_checker()
 
956
    
 
957
    # Disable - method
 
958
    @dbus.service.method(_interface)
 
959
    def Disable(self):
 
960
        "D-Bus method"
 
961
        self.disable()
 
962
    
 
963
    # StopChecker - method
 
964
    @dbus.service.method(_interface)
 
965
    def StopChecker(self):
 
966
        self.stop_checker()
 
967
    
 
968
    ## Properties
 
969
    
 
970
    # ApprovalPending - property
 
971
    @dbus_service_property(_interface, signature="b", access="read")
 
972
    def ApprovalPending_dbus_property(self):
 
973
        return dbus.Boolean(bool(self.approvals_pending))
 
974
    
 
975
    # ApprovedByDefault - property
 
976
    @dbus_service_property(_interface, signature="b",
 
977
                           access="readwrite")
 
978
    def ApprovedByDefault_dbus_property(self, value=None):
 
979
        if value is None:       # get
 
980
            return dbus.Boolean(self.approved_by_default)
 
981
        self.approved_by_default = bool(value)
 
982
        # Emit D-Bus signal
 
983
        self.PropertyChanged(dbus.String("ApprovedByDefault"),
 
984
                             dbus.Boolean(value, variant_level=1))
 
985
    
 
986
    # ApprovalDelay - property
 
987
    @dbus_service_property(_interface, signature="t",
 
988
                           access="readwrite")
 
989
    def ApprovalDelay_dbus_property(self, value=None):
 
990
        if value is None:       # get
 
991
            return dbus.UInt64(self.approval_delay_milliseconds())
 
992
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
993
        # Emit D-Bus signal
 
994
        self.PropertyChanged(dbus.String("ApprovalDelay"),
 
995
                             dbus.UInt64(value, variant_level=1))
 
996
    
 
997
    # ApprovalDuration - property
 
998
    @dbus_service_property(_interface, signature="t",
 
999
                           access="readwrite")
 
1000
    def ApprovalDuration_dbus_property(self, value=None):
 
1001
        if value is None:       # get
 
1002
            return dbus.UInt64(self._timedelta_to_milliseconds(
 
1003
                    self.approval_duration))
 
1004
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
1005
        # Emit D-Bus signal
 
1006
        self.PropertyChanged(dbus.String("ApprovalDuration"),
 
1007
                             dbus.UInt64(value, variant_level=1))
 
1008
    
 
1009
    # Name - property
 
1010
    @dbus_service_property(_interface, signature="s", access="read")
 
1011
    def Name_dbus_property(self):
 
1012
        return dbus.String(self.name)
 
1013
    
 
1014
    # Fingerprint - property
 
1015
    @dbus_service_property(_interface, signature="s", access="read")
 
1016
    def Fingerprint_dbus_property(self):
 
1017
        return dbus.String(self.fingerprint)
 
1018
    
 
1019
    # Host - property
 
1020
    @dbus_service_property(_interface, signature="s",
 
1021
                           access="readwrite")
 
1022
    def Host_dbus_property(self, value=None):
 
1023
        if value is None:       # get
 
1024
            return dbus.String(self.host)
 
1025
        self.host = value
 
1026
        # Emit D-Bus signal
 
1027
        self.PropertyChanged(dbus.String("Host"),
 
1028
                             dbus.String(value, variant_level=1))
 
1029
    
 
1030
    # Created - property
 
1031
    @dbus_service_property(_interface, signature="s", access="read")
 
1032
    def Created_dbus_property(self):
 
1033
        return dbus.String(self._datetime_to_dbus(self.created))
 
1034
    
 
1035
    # LastEnabled - property
 
1036
    @dbus_service_property(_interface, signature="s", access="read")
 
1037
    def LastEnabled_dbus_property(self):
 
1038
        if self.last_enabled is None:
 
1039
            return dbus.String("")
 
1040
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
 
1041
    
 
1042
    # Enabled - property
 
1043
    @dbus_service_property(_interface, signature="b",
 
1044
                           access="readwrite")
 
1045
    def Enabled_dbus_property(self, value=None):
 
1046
        if value is None:       # get
 
1047
            return dbus.Boolean(self.enabled)
 
1048
        if value:
 
1049
            self.enable()
 
1050
        else:
 
1051
            self.disable()
 
1052
    
 
1053
    # LastCheckedOK - property
 
1054
    @dbus_service_property(_interface, signature="s",
 
1055
                           access="readwrite")
 
1056
    def LastCheckedOK_dbus_property(self, value=None):
 
1057
        if value is not None:
 
1058
            self.checked_ok()
 
1059
            return
370
1060
        if self.last_checked_ok is None:
371
 
            return now < (self.created + self.timeout)
372
 
        else:
373
 
            return now < (self.last_checked_ok + self.timeout)
374
 
 
375
 
 
376
 
def peer_certificate(session):
377
 
    "Return the peer's OpenPGP certificate as a bytestring"
378
 
    # If not an OpenPGP certificate...
379
 
    if gnutls.library.functions.gnutls_certificate_type_get\
380
 
            (session._c_object) \
381
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
382
 
        # ...do the normal thing
383
 
        return session.peer_certificate
384
 
    list_size = ctypes.c_uint()
385
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
386
 
        (session._c_object, ctypes.byref(list_size))
387
 
    if list_size.value == 0:
388
 
        return None
389
 
    cert = cert_list[0]
390
 
    return ctypes.string_at(cert.data, cert.size)
391
 
 
392
 
 
393
 
def fingerprint(openpgp):
394
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
395
 
    # New GnuTLS "datum" with the OpenPGP public key
396
 
    datum = gnutls.library.types.gnutls_datum_t\
397
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
398
 
                     ctypes.POINTER(ctypes.c_ubyte)),
399
 
         ctypes.c_uint(len(openpgp)))
400
 
    # New empty GnuTLS certificate
401
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
402
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
403
 
        (ctypes.byref(crt))
404
 
    # Import the OpenPGP public key into the certificate
405
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
406
 
                    (crt, ctypes.byref(datum),
407
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
 
    # New buffer for the fingerprint
409
 
    buffer = ctypes.create_string_buffer(20)
410
 
    buffer_length = ctypes.c_size_t()
411
 
    # Get the fingerprint from the certificate into the buffer
412
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
413
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
414
 
    # Deinit the certificate
415
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
416
 
    # Convert the buffer to a Python bytestring
417
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
418
 
    # Convert the bytestring to hexadecimal notation
419
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
420
 
    return hex_fpr
421
 
 
422
 
 
423
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
424
 
    """A TCP request handler class.
425
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
1061
            return dbus.String("")
 
1062
        return dbus.String(self._datetime_to_dbus(self
 
1063
                                                  .last_checked_ok))
 
1064
    
 
1065
    # LastApprovalRequest - property
 
1066
    @dbus_service_property(_interface, signature="s", access="read")
 
1067
    def LastApprovalRequest_dbus_property(self):
 
1068
        if self.last_approval_request is None:
 
1069
            return dbus.String("")
 
1070
        return dbus.String(self.
 
1071
                           _datetime_to_dbus(self
 
1072
                                             .last_approval_request))
 
1073
    
 
1074
    # Timeout - property
 
1075
    @dbus_service_property(_interface, signature="t",
 
1076
                           access="readwrite")
 
1077
    def Timeout_dbus_property(self, value=None):
 
1078
        if value is None:       # get
 
1079
            return dbus.UInt64(self.timeout_milliseconds())
 
1080
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
1081
        # Emit D-Bus signal
 
1082
        self.PropertyChanged(dbus.String("Timeout"),
 
1083
                             dbus.UInt64(value, variant_level=1))
 
1084
        if getattr(self, "disable_initiator_tag", None) is None:
 
1085
            return
 
1086
        # Reschedule timeout
 
1087
        gobject.source_remove(self.disable_initiator_tag)
 
1088
        self.disable_initiator_tag = None
 
1089
        time_to_die = (self.
 
1090
                       _timedelta_to_milliseconds((self
 
1091
                                                   .last_checked_ok
 
1092
                                                   + self.timeout)
 
1093
                                                  - datetime.datetime
 
1094
                                                  .utcnow()))
 
1095
        if time_to_die <= 0:
 
1096
            # The timeout has passed
 
1097
            self.disable()
 
1098
        else:
 
1099
            self.disable_initiator_tag = (gobject.timeout_add
 
1100
                                          (time_to_die, self.disable))
 
1101
    
 
1102
    # Interval - property
 
1103
    @dbus_service_property(_interface, signature="t",
 
1104
                           access="readwrite")
 
1105
    def Interval_dbus_property(self, value=None):
 
1106
        if value is None:       # get
 
1107
            return dbus.UInt64(self.interval_milliseconds())
 
1108
        self.interval = datetime.timedelta(0, 0, 0, value)
 
1109
        # Emit D-Bus signal
 
1110
        self.PropertyChanged(dbus.String("Interval"),
 
1111
                             dbus.UInt64(value, variant_level=1))
 
1112
        if getattr(self, "checker_initiator_tag", None) is None:
 
1113
            return
 
1114
        # Reschedule checker run
 
1115
        gobject.source_remove(self.checker_initiator_tag)
 
1116
        self.checker_initiator_tag = (gobject.timeout_add
 
1117
                                      (value, self.start_checker))
 
1118
        self.start_checker()    # Start one now, too
 
1119
 
 
1120
    # Checker - property
 
1121
    @dbus_service_property(_interface, signature="s",
 
1122
                           access="readwrite")
 
1123
    def Checker_dbus_property(self, value=None):
 
1124
        if value is None:       # get
 
1125
            return dbus.String(self.checker_command)
 
1126
        self.checker_command = value
 
1127
        # Emit D-Bus signal
 
1128
        self.PropertyChanged(dbus.String("Checker"),
 
1129
                             dbus.String(self.checker_command,
 
1130
                                         variant_level=1))
 
1131
    
 
1132
    # CheckerRunning - property
 
1133
    @dbus_service_property(_interface, signature="b",
 
1134
                           access="readwrite")
 
1135
    def CheckerRunning_dbus_property(self, value=None):
 
1136
        if value is None:       # get
 
1137
            return dbus.Boolean(self.checker is not None)
 
1138
        if value:
 
1139
            self.start_checker()
 
1140
        else:
 
1141
            self.stop_checker()
 
1142
    
 
1143
    # ObjectPath - property
 
1144
    @dbus_service_property(_interface, signature="o", access="read")
 
1145
    def ObjectPath_dbus_property(self):
 
1146
        return self.dbus_object_path # is already a dbus.ObjectPath
 
1147
    
 
1148
    # Secret = property
 
1149
    @dbus_service_property(_interface, signature="ay",
 
1150
                           access="write", byte_arrays=True)
 
1151
    def Secret_dbus_property(self, value):
 
1152
        self.secret = str(value)
 
1153
    
 
1154
    del _interface
 
1155
 
 
1156
 
 
1157
class ProxyClient(object):
 
1158
    def __init__(self, child_pipe, fpr, address):
 
1159
        self._pipe = child_pipe
 
1160
        self._pipe.send(('init', fpr, address))
 
1161
        if not self._pipe.recv():
 
1162
            raise KeyError()
 
1163
 
 
1164
    def __getattribute__(self, name):
 
1165
        if(name == '_pipe'):
 
1166
            return super(ProxyClient, self).__getattribute__(name)
 
1167
        self._pipe.send(('getattr', name))
 
1168
        data = self._pipe.recv()
 
1169
        if data[0] == 'data':
 
1170
            return data[1]
 
1171
        if data[0] == 'function':
 
1172
            def func(*args, **kwargs):
 
1173
                self._pipe.send(('funcall', name, args, kwargs))
 
1174
                return self._pipe.recv()[1]
 
1175
            return func
 
1176
 
 
1177
    def __setattr__(self, name, value):
 
1178
        if(name == '_pipe'):
 
1179
            return super(ProxyClient, self).__setattr__(name, value)
 
1180
        self._pipe.send(('setattr', name, value))
 
1181
 
 
1182
 
 
1183
class ClientHandler(socketserver.BaseRequestHandler, object):
 
1184
    """A class to handle client connections.
 
1185
    
 
1186
    Instantiated once for each connection to handle it.
426
1187
    Note: This will run in its own forked process."""
427
1188
    
428
1189
    def handle(self):
429
 
        logger.info(u"TCP connection from: %s",
430
 
                     unicode(self.client_address))
431
 
        session = gnutls.connection.ClientSession\
432
 
                  (self.request, gnutls.connection.X509Credentials())
433
 
        
434
 
        line = self.request.makefile().readline()
435
 
        logger.debug(u"Protocol version: %r", line)
436
 
        try:
437
 
            if int(line.strip().split()[0]) > 1:
438
 
                raise RuntimeError
439
 
        except (ValueError, IndexError, RuntimeError), error:
440
 
            logger.error(u"Unknown protocol version: %s", error)
441
 
            return
442
 
        
443
 
        # Note: gnutls.connection.X509Credentials is really a generic
444
 
        # GnuTLS certificate credentials object so long as no X.509
445
 
        # keys are added to it.  Therefore, we can use it here despite
446
 
        # using OpenPGP certificates.
447
 
        
448
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
449
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
450
 
        #                "+DHE-DSS"))
451
 
        priority = "NORMAL"             # Fallback default, since this
452
 
                                        # MUST be set.
453
 
        if self.server.settings["priority"]:
454
 
            priority = self.server.settings["priority"]
455
 
        gnutls.library.functions.gnutls_priority_set_direct\
456
 
            (session._c_object, priority, None);
457
 
        
458
 
        try:
459
 
            session.handshake()
460
 
        except gnutls.errors.GNUTLSError, error:
461
 
            logger.warning(u"Handshake failed: %s", error)
462
 
            # Do not run session.bye() here: the session is not
463
 
            # established.  Just abandon the request.
464
 
            return
465
 
        try:
466
 
            fpr = fingerprint(peer_certificate(session))
467
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
468
 
            logger.warning(u"Bad certificate: %s", error)
469
 
            session.bye()
470
 
            return
471
 
        logger.debug(u"Fingerprint: %s", fpr)
472
 
        client = None
473
 
        for c in self.server.clients:
474
 
            if c.fingerprint == fpr:
475
 
                client = c
476
 
                break
477
 
        if not client:
478
 
            logger.warning(u"Client not found for fingerprint: %s",
479
 
                           fpr)
480
 
            session.bye()
481
 
            return
482
 
        # Have to check if client.still_valid(), since it is possible
483
 
        # that the client timed out while establishing the GnuTLS
484
 
        # session.
485
 
        if not client.still_valid():
486
 
            logger.warning(u"Client %(name)s is invalid",
487
 
                           vars(client))
488
 
            session.bye()
489
 
            return
490
 
        sent_size = 0
491
 
        while sent_size < len(client.secret):
492
 
            sent = session.send(client.secret[sent_size:])
493
 
            logger.debug(u"Sent: %d, remaining: %d",
494
 
                         sent, len(client.secret)
495
 
                         - (sent_size + sent))
496
 
            sent_size += sent
497
 
        session.bye()
498
 
 
499
 
 
500
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
501
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
1190
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
1191
            logger.info("TCP connection from: %s",
 
1192
                        unicode(self.client_address))
 
1193
            logger.debug("Pipe FD: %d",
 
1194
                         self.server.child_pipe.fileno())
 
1195
 
 
1196
            session = (gnutls.connection
 
1197
                       .ClientSession(self.request,
 
1198
                                      gnutls.connection
 
1199
                                      .X509Credentials()))
 
1200
 
 
1201
            # Note: gnutls.connection.X509Credentials is really a
 
1202
            # generic GnuTLS certificate credentials object so long as
 
1203
            # no X.509 keys are added to it.  Therefore, we can use it
 
1204
            # here despite using OpenPGP certificates.
 
1205
 
 
1206
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
 
1207
            #                      "+AES-256-CBC", "+SHA1",
 
1208
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
 
1209
            #                      "+DHE-DSS"))
 
1210
            # Use a fallback default, since this MUST be set.
 
1211
            priority = self.server.gnutls_priority
 
1212
            if priority is None:
 
1213
                priority = "NORMAL"
 
1214
            (gnutls.library.functions
 
1215
             .gnutls_priority_set_direct(session._c_object,
 
1216
                                         priority, None))
 
1217
 
 
1218
            # Start communication using the Mandos protocol
 
1219
            # Get protocol number
 
1220
            line = self.request.makefile().readline()
 
1221
            logger.debug("Protocol version: %r", line)
 
1222
            try:
 
1223
                if int(line.strip().split()[0]) > 1:
 
1224
                    raise RuntimeError
 
1225
            except (ValueError, IndexError, RuntimeError) as error:
 
1226
                logger.error("Unknown protocol version: %s", error)
 
1227
                return
 
1228
 
 
1229
            # Start GnuTLS connection
 
1230
            try:
 
1231
                session.handshake()
 
1232
            except gnutls.errors.GNUTLSError as error:
 
1233
                logger.warning("Handshake failed: %s", error)
 
1234
                # Do not run session.bye() here: the session is not
 
1235
                # established.  Just abandon the request.
 
1236
                return
 
1237
            logger.debug("Handshake succeeded")
 
1238
 
 
1239
            approval_required = False
 
1240
            try:
 
1241
                try:
 
1242
                    fpr = self.fingerprint(self.peer_certificate
 
1243
                                           (session))
 
1244
                except (TypeError,
 
1245
                        gnutls.errors.GNUTLSError) as error:
 
1246
                    logger.warning("Bad certificate: %s", error)
 
1247
                    return
 
1248
                logger.debug("Fingerprint: %s", fpr)
 
1249
 
 
1250
                try:
 
1251
                    client = ProxyClient(child_pipe, fpr,
 
1252
                                         self.client_address)
 
1253
                except KeyError:
 
1254
                    return
 
1255
                
 
1256
                if client.approval_delay:
 
1257
                    delay = client.approval_delay
 
1258
                    client.approvals_pending += 1
 
1259
                    approval_required = True
 
1260
                
 
1261
                while True:
 
1262
                    if not client.enabled:
 
1263
                        logger.warning("Client %s is disabled",
 
1264
                                       client.name)
 
1265
                        if self.server.use_dbus:
 
1266
                            # Emit D-Bus signal
 
1267
                            client.Rejected("Disabled")                    
 
1268
                        return
 
1269
                    
 
1270
                    if client._approved or not client.approval_delay:
 
1271
                        #We are approved or approval is disabled
 
1272
                        break
 
1273
                    elif client._approved is None:
 
1274
                        logger.info("Client %s needs approval",
 
1275
                                    client.name)
 
1276
                        if self.server.use_dbus:
 
1277
                            # Emit D-Bus signal
 
1278
                            client.NeedApproval(
 
1279
                                client.approval_delay_milliseconds(),
 
1280
                                client.approved_by_default)
 
1281
                    else:
 
1282
                        logger.warning("Client %s was not approved",
 
1283
                                       client.name)
 
1284
                        if self.server.use_dbus:
 
1285
                            # Emit D-Bus signal
 
1286
                            client.Rejected("Denied")
 
1287
                        return
 
1288
                    
 
1289
                    #wait until timeout or approved
 
1290
                    #x = float(client._timedelta_to_milliseconds(delay))
 
1291
                    time = datetime.datetime.now()
 
1292
                    client.changedstate.acquire()
 
1293
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
 
1294
                    client.changedstate.release()
 
1295
                    time2 = datetime.datetime.now()
 
1296
                    if (time2 - time) >= delay:
 
1297
                        if not client.approved_by_default:
 
1298
                            logger.warning("Client %s timed out while"
 
1299
                                           " waiting for approval",
 
1300
                                           client.name)
 
1301
                            if self.server.use_dbus:
 
1302
                                # Emit D-Bus signal
 
1303
                                client.Rejected("Approval timed out")
 
1304
                            return
 
1305
                        else:
 
1306
                            break
 
1307
                    else:
 
1308
                        delay -= time2 - time
 
1309
                
 
1310
                sent_size = 0
 
1311
                while sent_size < len(client.secret):
 
1312
                    try:
 
1313
                        sent = session.send(client.secret[sent_size:])
 
1314
                    except gnutls.errors.GNUTLSError as error:
 
1315
                        logger.warning("gnutls send failed")
 
1316
                        return
 
1317
                    logger.debug("Sent: %d, remaining: %d",
 
1318
                                 sent, len(client.secret)
 
1319
                                 - (sent_size + sent))
 
1320
                    sent_size += sent
 
1321
 
 
1322
                logger.info("Sending secret to %s", client.name)
 
1323
                # bump the timeout as if seen
 
1324
                client.checked_ok()
 
1325
                if self.server.use_dbus:
 
1326
                    # Emit D-Bus signal
 
1327
                    client.GotSecret()
 
1328
            
 
1329
            finally:
 
1330
                if approval_required:
 
1331
                    client.approvals_pending -= 1
 
1332
                try:
 
1333
                    session.bye()
 
1334
                except gnutls.errors.GNUTLSError as error:
 
1335
                    logger.warning("GnuTLS bye failed")
 
1336
    
 
1337
    @staticmethod
 
1338
    def peer_certificate(session):
 
1339
        "Return the peer's OpenPGP certificate as a bytestring"
 
1340
        # If not an OpenPGP certificate...
 
1341
        if (gnutls.library.functions
 
1342
            .gnutls_certificate_type_get(session._c_object)
 
1343
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
1344
            # ...do the normal thing
 
1345
            return session.peer_certificate
 
1346
        list_size = ctypes.c_uint(1)
 
1347
        cert_list = (gnutls.library.functions
 
1348
                     .gnutls_certificate_get_peers
 
1349
                     (session._c_object, ctypes.byref(list_size)))
 
1350
        if not bool(cert_list) and list_size.value != 0:
 
1351
            raise gnutls.errors.GNUTLSError("error getting peer"
 
1352
                                            " certificate")
 
1353
        if list_size.value == 0:
 
1354
            return None
 
1355
        cert = cert_list[0]
 
1356
        return ctypes.string_at(cert.data, cert.size)
 
1357
    
 
1358
    @staticmethod
 
1359
    def fingerprint(openpgp):
 
1360
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
1361
        # New GnuTLS "datum" with the OpenPGP public key
 
1362
        datum = (gnutls.library.types
 
1363
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
1364
                                             ctypes.POINTER
 
1365
                                             (ctypes.c_ubyte)),
 
1366
                                 ctypes.c_uint(len(openpgp))))
 
1367
        # New empty GnuTLS certificate
 
1368
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
1369
        (gnutls.library.functions
 
1370
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
1371
        # Import the OpenPGP public key into the certificate
 
1372
        (gnutls.library.functions
 
1373
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
1374
                                    gnutls.library.constants
 
1375
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
1376
        # Verify the self signature in the key
 
1377
        crtverify = ctypes.c_uint()
 
1378
        (gnutls.library.functions
 
1379
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
1380
                                         ctypes.byref(crtverify)))
 
1381
        if crtverify.value != 0:
 
1382
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1383
            raise (gnutls.errors.CertificateSecurityError
 
1384
                   ("Verify failed"))
 
1385
        # New buffer for the fingerprint
 
1386
        buf = ctypes.create_string_buffer(20)
 
1387
        buf_len = ctypes.c_size_t()
 
1388
        # Get the fingerprint from the certificate into the buffer
 
1389
        (gnutls.library.functions
 
1390
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
1391
                                             ctypes.byref(buf_len)))
 
1392
        # Deinit the certificate
 
1393
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1394
        # Convert the buffer to a Python bytestring
 
1395
        fpr = ctypes.string_at(buf, buf_len.value)
 
1396
        # Convert the bytestring to hexadecimal notation
 
1397
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
 
1398
        return hex_fpr
 
1399
 
 
1400
 
 
1401
class MultiprocessingMixIn(object):
 
1402
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
1403
    def sub_process_main(self, request, address):
 
1404
        try:
 
1405
            self.finish_request(request, address)
 
1406
        except:
 
1407
            self.handle_error(request, address)
 
1408
        self.close_request(request)
 
1409
            
 
1410
    def process_request(self, request, address):
 
1411
        """Start a new process to process the request."""
 
1412
        multiprocessing.Process(target = self.sub_process_main,
 
1413
                                args = (request, address)).start()
 
1414
 
 
1415
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
1416
    """ adds a pipe to the MixIn """
 
1417
    def process_request(self, request, client_address):
 
1418
        """Overrides and wraps the original process_request().
 
1419
        
 
1420
        This function creates a new pipe in self.pipe
 
1421
        """
 
1422
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
1423
 
 
1424
        super(MultiprocessingMixInWithPipe,
 
1425
              self).process_request(request, client_address)
 
1426
        self.child_pipe.close()
 
1427
        self.add_pipe(parent_pipe)
 
1428
 
 
1429
    def add_pipe(self, parent_pipe):
 
1430
        """Dummy function; override as necessary"""
 
1431
        raise NotImplementedError
 
1432
 
 
1433
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
1434
                     socketserver.TCPServer, object):
 
1435
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
1436
    
502
1437
    Attributes:
503
 
        settings:       Server settings
504
 
        clients:        Set() of Client objects
 
1438
        enabled:        Boolean; whether this server is activated yet
 
1439
        interface:      None or a network interface name (string)
 
1440
        use_ipv6:       Boolean; to use IPv6 or not
505
1441
    """
506
 
    address_family = socket.AF_INET6
507
 
    def __init__(self, *args, **kwargs):
508
 
        if "settings" in kwargs:
509
 
            self.settings = kwargs["settings"]
510
 
            del kwargs["settings"]
511
 
        if "clients" in kwargs:
512
 
            self.clients = kwargs["clients"]
513
 
            del kwargs["clients"]
514
 
        return super(type(self), self).__init__(*args, **kwargs)
 
1442
    def __init__(self, server_address, RequestHandlerClass,
 
1443
                 interface=None, use_ipv6=True):
 
1444
        self.interface = interface
 
1445
        if use_ipv6:
 
1446
            self.address_family = socket.AF_INET6
 
1447
        socketserver.TCPServer.__init__(self, server_address,
 
1448
                                        RequestHandlerClass)
515
1449
    def server_bind(self):
516
1450
        """This overrides the normal server_bind() function
517
1451
        to bind to an interface if one was specified, and also NOT to
518
1452
        bind to an address or port if they were not specified."""
519
 
        if self.settings["interface"]:
520
 
            # 25 is from /usr/include/asm-i486/socket.h
521
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
522
 
            try:
523
 
                self.socket.setsockopt(socket.SOL_SOCKET,
524
 
                                       SO_BINDTODEVICE,
525
 
                                       self.settings["interface"])
526
 
            except socket.error, error:
527
 
                if error[0] == errno.EPERM:
528
 
                    logger.error(u"No permission to"
529
 
                                 u" bind to interface %s",
530
 
                                 self.settings["interface"])
531
 
                else:
532
 
                    raise error
 
1453
        if self.interface is not None:
 
1454
            if SO_BINDTODEVICE is None:
 
1455
                logger.error("SO_BINDTODEVICE does not exist;"
 
1456
                             " cannot bind to interface %s",
 
1457
                             self.interface)
 
1458
            else:
 
1459
                try:
 
1460
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
1461
                                           SO_BINDTODEVICE,
 
1462
                                           str(self.interface
 
1463
                                               + '\0'))
 
1464
                except socket.error as error:
 
1465
                    if error[0] == errno.EPERM:
 
1466
                        logger.error("No permission to"
 
1467
                                     " bind to interface %s",
 
1468
                                     self.interface)
 
1469
                    elif error[0] == errno.ENOPROTOOPT:
 
1470
                        logger.error("SO_BINDTODEVICE not available;"
 
1471
                                     " cannot bind to interface %s",
 
1472
                                     self.interface)
 
1473
                    else:
 
1474
                        raise
533
1475
        # Only bind(2) the socket if we really need to.
534
1476
        if self.server_address[0] or self.server_address[1]:
535
1477
            if not self.server_address[0]:
536
 
                in6addr_any = "::"
537
 
                self.server_address = (in6addr_any,
 
1478
                if self.address_family == socket.AF_INET6:
 
1479
                    any_address = "::" # in6addr_any
 
1480
                else:
 
1481
                    any_address = socket.INADDR_ANY
 
1482
                self.server_address = (any_address,
538
1483
                                       self.server_address[1])
539
1484
            elif not self.server_address[1]:
540
1485
                self.server_address = (self.server_address[0],
541
1486
                                       0)
542
 
#                 if self.settings["interface"]:
 
1487
#                 if self.interface:
543
1488
#                     self.server_address = (self.server_address[0],
544
1489
#                                            0, # port
545
1490
#                                            0, # flowinfo
546
1491
#                                            if_nametoindex
547
 
#                                            (self.settings
548
 
#                                             ["interface"]))
549
 
            return super(type(self), self).server_bind()
 
1492
#                                            (self.interface))
 
1493
            return socketserver.TCPServer.server_bind(self)
 
1494
 
 
1495
 
 
1496
class MandosServer(IPv6_TCPServer):
 
1497
    """Mandos server.
 
1498
    
 
1499
    Attributes:
 
1500
        clients:        set of Client objects
 
1501
        gnutls_priority GnuTLS priority string
 
1502
        use_dbus:       Boolean; to emit D-Bus signals or not
 
1503
    
 
1504
    Assumes a gobject.MainLoop event loop.
 
1505
    """
 
1506
    def __init__(self, server_address, RequestHandlerClass,
 
1507
                 interface=None, use_ipv6=True, clients=None,
 
1508
                 gnutls_priority=None, use_dbus=True):
 
1509
        self.enabled = False
 
1510
        self.clients = clients
 
1511
        if self.clients is None:
 
1512
            self.clients = set()
 
1513
        self.use_dbus = use_dbus
 
1514
        self.gnutls_priority = gnutls_priority
 
1515
        IPv6_TCPServer.__init__(self, server_address,
 
1516
                                RequestHandlerClass,
 
1517
                                interface = interface,
 
1518
                                use_ipv6 = use_ipv6)
 
1519
    def server_activate(self):
 
1520
        if self.enabled:
 
1521
            return socketserver.TCPServer.server_activate(self)
 
1522
    def enable(self):
 
1523
        self.enabled = True
 
1524
    def add_pipe(self, parent_pipe):
 
1525
        # Call "handle_ipc" for both data and EOF events
 
1526
        gobject.io_add_watch(parent_pipe.fileno(),
 
1527
                             gobject.IO_IN | gobject.IO_HUP,
 
1528
                             functools.partial(self.handle_ipc,
 
1529
                                               parent_pipe = parent_pipe))
 
1530
        
 
1531
    def handle_ipc(self, source, condition, parent_pipe=None,
 
1532
                   client_object=None):
 
1533
        condition_names = {
 
1534
            gobject.IO_IN: "IN",   # There is data to read.
 
1535
            gobject.IO_OUT: "OUT", # Data can be written (without
 
1536
                                    # blocking).
 
1537
            gobject.IO_PRI: "PRI", # There is urgent data to read.
 
1538
            gobject.IO_ERR: "ERR", # Error condition.
 
1539
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
 
1540
                                    # broken, usually for pipes and
 
1541
                                    # sockets).
 
1542
            }
 
1543
        conditions_string = ' | '.join(name
 
1544
                                       for cond, name in
 
1545
                                       condition_names.iteritems()
 
1546
                                       if cond & condition)
 
1547
        # error or the other end of multiprocessing.Pipe has closed
 
1548
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
 
1549
            return False
 
1550
        
 
1551
        # Read a request from the child
 
1552
        request = parent_pipe.recv()
 
1553
        command = request[0]
 
1554
        
 
1555
        if command == 'init':
 
1556
            fpr = request[1]
 
1557
            address = request[2]
 
1558
            
 
1559
            for c in self.clients:
 
1560
                if c.fingerprint == fpr:
 
1561
                    client = c
 
1562
                    break
 
1563
            else:
 
1564
                logger.warning("Client not found for fingerprint: %s, ad"
 
1565
                               "dress: %s", fpr, address)
 
1566
                if self.use_dbus:
 
1567
                    # Emit D-Bus signal
 
1568
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
 
1569
                parent_pipe.send(False)
 
1570
                return False
 
1571
            
 
1572
            gobject.io_add_watch(parent_pipe.fileno(),
 
1573
                                 gobject.IO_IN | gobject.IO_HUP,
 
1574
                                 functools.partial(self.handle_ipc,
 
1575
                                                   parent_pipe = parent_pipe,
 
1576
                                                   client_object = client))
 
1577
            parent_pipe.send(True)
 
1578
            # remove the old hook in favor of the new above hook on same fileno
 
1579
            return False
 
1580
        if command == 'funcall':
 
1581
            funcname = request[1]
 
1582
            args = request[2]
 
1583
            kwargs = request[3]
 
1584
            
 
1585
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
 
1586
 
 
1587
        if command == 'getattr':
 
1588
            attrname = request[1]
 
1589
            if callable(client_object.__getattribute__(attrname)):
 
1590
                parent_pipe.send(('function',))
 
1591
            else:
 
1592
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
 
1593
        
 
1594
        if command == 'setattr':
 
1595
            attrname = request[1]
 
1596
            value = request[2]
 
1597
            setattr(client_object, attrname, value)
 
1598
 
 
1599
        return True
550
1600
 
551
1601
 
552
1602
def string_to_delta(interval):
553
1603
    """Parse a string and return a datetime.timedelta
554
 
 
 
1604
    
555
1605
    >>> string_to_delta('7d')
556
1606
    datetime.timedelta(7)
557
1607
    >>> string_to_delta('60s')
560
1610
    datetime.timedelta(0, 3600)
561
1611
    >>> string_to_delta('24h')
562
1612
    datetime.timedelta(1)
563
 
    >>> string_to_delta(u'1w')
 
1613
    >>> string_to_delta('1w')
564
1614
    datetime.timedelta(7)
 
1615
    >>> string_to_delta('5m 30s')
 
1616
    datetime.timedelta(0, 330)
565
1617
    """
566
 
    try:
567
 
        suffix=unicode(interval[-1])
568
 
        value=int(interval[:-1])
569
 
        if suffix == u"d":
570
 
            delta = datetime.timedelta(value)
571
 
        elif suffix == u"s":
572
 
            delta = datetime.timedelta(0, value)
573
 
        elif suffix == u"m":
574
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
575
 
        elif suffix == u"h":
576
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
577
 
        elif suffix == u"w":
578
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
579
 
        else:
580
 
            raise ValueError
581
 
    except (ValueError, IndexError):
582
 
        raise ValueError
583
 
    return delta
584
 
 
585
 
 
586
 
def server_state_changed(state):
587
 
    """Derived from the Avahi example code"""
588
 
    if state == avahi.SERVER_COLLISION:
589
 
        logger.error(u"Server name collision")
590
 
        service.remove()
591
 
    elif state == avahi.SERVER_RUNNING:
592
 
        service.add()
593
 
 
594
 
 
595
 
def entry_group_state_changed(state, error):
596
 
    """Derived from the Avahi example code"""
597
 
    logger.debug(u"state change: %i", state)
598
 
    
599
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
600
 
        logger.debug(u"Service established.")
601
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
602
 
        logger.warning(u"Service name collision.")
603
 
        service.rename()
604
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
605
 
        logger.critical(u"Error in group state changed %s",
606
 
                        unicode(error))
607
 
        raise AvahiGroupError("State changed: %s", str(error))
 
1618
    timevalue = datetime.timedelta(0)
 
1619
    for s in interval.split():
 
1620
        try:
 
1621
            suffix = unicode(s[-1])
 
1622
            value = int(s[:-1])
 
1623
            if suffix == "d":
 
1624
                delta = datetime.timedelta(value)
 
1625
            elif suffix == "s":
 
1626
                delta = datetime.timedelta(0, value)
 
1627
            elif suffix == "m":
 
1628
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
1629
            elif suffix == "h":
 
1630
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
1631
            elif suffix == "w":
 
1632
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
1633
            else:
 
1634
                raise ValueError("Unknown suffix %r" % suffix)
 
1635
        except (ValueError, IndexError) as e:
 
1636
            raise ValueError(*(e.args))
 
1637
        timevalue += delta
 
1638
    return timevalue
 
1639
 
608
1640
 
609
1641
def if_nametoindex(interface):
610
 
    """Call the C function if_nametoindex(), or equivalent"""
 
1642
    """Call the C function if_nametoindex(), or equivalent
 
1643
    
 
1644
    Note: This function cannot accept a unicode string."""
611
1645
    global if_nametoindex
612
1646
    try:
613
 
        if "ctypes.util" not in sys.modules:
614
 
            import ctypes.util
615
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
616
 
            (ctypes.util.find_library("c")).if_nametoindex
 
1647
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1648
                          (ctypes.util.find_library("c"))
 
1649
                          .if_nametoindex)
617
1650
    except (OSError, AttributeError):
618
 
        if "struct" not in sys.modules:
619
 
            import struct
620
 
        if "fcntl" not in sys.modules:
621
 
            import fcntl
 
1651
        logger.warning("Doing if_nametoindex the hard way")
622
1652
        def if_nametoindex(interface):
623
1653
            "Get an interface index the hard way, i.e. using fcntl()"
624
1654
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
625
 
            s = socket.socket()
626
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
627
 
                                struct.pack("16s16x", interface))
628
 
            s.close()
629
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
1655
            with contextlib.closing(socket.socket()) as s:
 
1656
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1657
                                    struct.pack(str("16s16x"),
 
1658
                                                interface))
 
1659
            interface_index = struct.unpack(str("I"),
 
1660
                                            ifreq[16:20])[0]
630
1661
            return interface_index
631
1662
    return if_nametoindex(interface)
632
1663
 
633
1664
 
634
1665
def daemon(nochdir = False, noclose = False):
635
1666
    """See daemon(3).  Standard BSD Unix function.
 
1667
    
636
1668
    This should really exist as os.daemon, but it doesn't (yet)."""
637
1669
    if os.fork():
638
1670
        sys.exit()
646
1678
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
647
1679
        if not stat.S_ISCHR(os.fstat(null).st_mode):
648
1680
            raise OSError(errno.ENODEV,
649
 
                          "/dev/null not a character device")
 
1681
                          "%s not a character device"
 
1682
                          % os.path.devnull)
650
1683
        os.dup2(null, sys.stdin.fileno())
651
1684
        os.dup2(null, sys.stdout.fileno())
652
1685
        os.dup2(null, sys.stderr.fileno())
655
1688
 
656
1689
 
657
1690
def main():
658
 
    global main_loop_started
659
 
    main_loop_started = False
660
 
    
661
 
    parser = OptionParser(version = "%%prog %s" % version)
662
 
    parser.add_option("-i", "--interface", type="string",
663
 
                      metavar="IF", help="Bind to interface IF")
664
 
    parser.add_option("-a", "--address", type="string",
665
 
                      help="Address to listen for requests on")
666
 
    parser.add_option("-p", "--port", type="int",
667
 
                      help="Port number to receive requests on")
668
 
    parser.add_option("--check", action="store_true", default=False,
669
 
                      help="Run self-test")
670
 
    parser.add_option("--debug", action="store_true",
671
 
                      help="Debug mode; run in foreground and log to"
672
 
                      " terminal")
673
 
    parser.add_option("--priority", type="string", help="GnuTLS"
674
 
                      " priority string (see GnuTLS documentation)")
675
 
    parser.add_option("--servicename", type="string", metavar="NAME",
676
 
                      help="Zeroconf service name")
677
 
    parser.add_option("--configdir", type="string",
678
 
                      default="/etc/mandos", metavar="DIR",
679
 
                      help="Directory to search for configuration"
680
 
                      " files")
681
 
    (options, args) = parser.parse_args()
 
1691
    
 
1692
    ##################################################################
 
1693
    # Parsing of options, both command line and config file
 
1694
    
 
1695
    parser = argparse.ArgumentParser()
 
1696
    parser.add_argument("-v", "--version", action="version",
 
1697
                        version = "%%(prog)s %s" % version,
 
1698
                        help="show version number and exit")
 
1699
    parser.add_argument("-i", "--interface", metavar="IF",
 
1700
                        help="Bind to interface IF")
 
1701
    parser.add_argument("-a", "--address",
 
1702
                        help="Address to listen for requests on")
 
1703
    parser.add_argument("-p", "--port", type=int,
 
1704
                        help="Port number to receive requests on")
 
1705
    parser.add_argument("--check", action="store_true",
 
1706
                        help="Run self-test")
 
1707
    parser.add_argument("--debug", action="store_true",
 
1708
                        help="Debug mode; run in foreground and log"
 
1709
                        " to terminal")
 
1710
    parser.add_argument("--debuglevel", metavar="LEVEL",
 
1711
                        help="Debug level for stdout output")
 
1712
    parser.add_argument("--priority", help="GnuTLS"
 
1713
                        " priority string (see GnuTLS documentation)")
 
1714
    parser.add_argument("--servicename",
 
1715
                        metavar="NAME", help="Zeroconf service name")
 
1716
    parser.add_argument("--configdir",
 
1717
                        default="/etc/mandos", metavar="DIR",
 
1718
                        help="Directory to search for configuration"
 
1719
                        " files")
 
1720
    parser.add_argument("--no-dbus", action="store_false",
 
1721
                        dest="use_dbus", help="Do not provide D-Bus"
 
1722
                        " system bus interface")
 
1723
    parser.add_argument("--no-ipv6", action="store_false",
 
1724
                        dest="use_ipv6", help="Do not use IPv6")
 
1725
    options = parser.parse_args()
682
1726
    
683
1727
    if options.check:
684
1728
        import doctest
693
1737
                        "priority":
694
1738
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
695
1739
                        "servicename": "Mandos",
 
1740
                        "use_dbus": "True",
 
1741
                        "use_ipv6": "True",
 
1742
                        "debuglevel": "",
696
1743
                        }
697
1744
    
698
1745
    # Parse config file for server-global settings
699
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
1746
    server_config = configparser.SafeConfigParser(server_defaults)
700
1747
    del server_defaults
701
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
 
    server_section = "server"
 
1748
    server_config.read(os.path.join(options.configdir,
 
1749
                                    "mandos.conf"))
703
1750
    # Convert the SafeConfigParser object to a dict
704
 
    server_settings = dict(server_config.items(server_section))
705
 
    # Use getboolean on the boolean config option
706
 
    server_settings["debug"] = server_config.getboolean\
707
 
                               (server_section, "debug")
 
1751
    server_settings = server_config.defaults()
 
1752
    # Use the appropriate methods on the non-string config options
 
1753
    for option in ("debug", "use_dbus", "use_ipv6"):
 
1754
        server_settings[option] = server_config.getboolean("DEFAULT",
 
1755
                                                           option)
 
1756
    if server_settings["port"]:
 
1757
        server_settings["port"] = server_config.getint("DEFAULT",
 
1758
                                                       "port")
708
1759
    del server_config
709
1760
    
710
1761
    # Override the settings from the config file with command line
711
1762
    # options, if set.
712
1763
    for option in ("interface", "address", "port", "debug",
713
 
                   "priority", "servicename", "configdir"):
 
1764
                   "priority", "servicename", "configdir",
 
1765
                   "use_dbus", "use_ipv6", "debuglevel"):
714
1766
        value = getattr(options, option)
715
1767
        if value is not None:
716
1768
            server_settings[option] = value
717
1769
    del options
 
1770
    # Force all strings to be unicode
 
1771
    for option in server_settings.keys():
 
1772
        if type(server_settings[option]) is str:
 
1773
            server_settings[option] = unicode(server_settings[option])
718
1774
    # Now we have our good server settings in "server_settings"
719
1775
    
 
1776
    ##################################################################
 
1777
    
 
1778
    # For convenience
720
1779
    debug = server_settings["debug"]
721
 
    
722
 
    if not debug:
723
 
        syslogger.setLevel(logging.WARNING)
724
 
        console.setLevel(logging.WARNING)
725
 
    
 
1780
    debuglevel = server_settings["debuglevel"]
 
1781
    use_dbus = server_settings["use_dbus"]
 
1782
    use_ipv6 = server_settings["use_ipv6"]
 
1783
 
726
1784
    if server_settings["servicename"] != "Mandos":
727
 
        syslogger.setFormatter(logging.Formatter\
728
 
                               ('Mandos (%s): %%(levelname)s:'
729
 
                                ' %%(message)s'
 
1785
        syslogger.setFormatter(logging.Formatter
 
1786
                               ('Mandos (%s) [%%(process)d]:'
 
1787
                                ' %%(levelname)s: %%(message)s'
730
1788
                                % server_settings["servicename"]))
731
1789
    
732
1790
    # Parse config file with clients
733
1791
    client_defaults = { "timeout": "1h",
734
1792
                        "interval": "5m",
735
1793
                        "checker": "fping -q -- %%(host)s",
 
1794
                        "host": "",
 
1795
                        "approval_delay": "0s",
 
1796
                        "approval_duration": "1s",
736
1797
                        }
737
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
1798
    client_config = configparser.SafeConfigParser(client_defaults)
738
1799
    client_config.read(os.path.join(server_settings["configdir"],
739
1800
                                    "clients.conf"))
740
1801
    
741
 
    global service
742
 
    service = AvahiService(name = server_settings["servicename"],
743
 
                           type = "_mandos._tcp", );
744
 
    if server_settings["interface"]:
745
 
        service.interface = if_nametoindex(server_settings["interface"])
 
1802
    global mandos_dbus_service
 
1803
    mandos_dbus_service = None
 
1804
    
 
1805
    tcp_server = MandosServer((server_settings["address"],
 
1806
                               server_settings["port"]),
 
1807
                              ClientHandler,
 
1808
                              interface=(server_settings["interface"]
 
1809
                                         or None),
 
1810
                              use_ipv6=use_ipv6,
 
1811
                              gnutls_priority=
 
1812
                              server_settings["priority"],
 
1813
                              use_dbus=use_dbus)
 
1814
    if not debug:
 
1815
        pidfilename = "/var/run/mandos.pid"
 
1816
        try:
 
1817
            pidfile = open(pidfilename, "w")
 
1818
        except IOError:
 
1819
            logger.error("Could not open file %r", pidfilename)
 
1820
    
 
1821
    try:
 
1822
        uid = pwd.getpwnam("_mandos").pw_uid
 
1823
        gid = pwd.getpwnam("_mandos").pw_gid
 
1824
    except KeyError:
 
1825
        try:
 
1826
            uid = pwd.getpwnam("mandos").pw_uid
 
1827
            gid = pwd.getpwnam("mandos").pw_gid
 
1828
        except KeyError:
 
1829
            try:
 
1830
                uid = pwd.getpwnam("nobody").pw_uid
 
1831
                gid = pwd.getpwnam("nobody").pw_gid
 
1832
            except KeyError:
 
1833
                uid = 65534
 
1834
                gid = 65534
 
1835
    try:
 
1836
        os.setgid(gid)
 
1837
        os.setuid(uid)
 
1838
    except OSError as error:
 
1839
        if error[0] != errno.EPERM:
 
1840
            raise error
 
1841
    
 
1842
    if not debug and not debuglevel:
 
1843
        syslogger.setLevel(logging.WARNING)
 
1844
        console.setLevel(logging.WARNING)
 
1845
    if debuglevel:
 
1846
        level = getattr(logging, debuglevel.upper())
 
1847
        syslogger.setLevel(level)
 
1848
        console.setLevel(level)
 
1849
 
 
1850
    if debug:
 
1851
        # Enable all possible GnuTLS debugging
 
1852
        
 
1853
        # "Use a log level over 10 to enable all debugging options."
 
1854
        # - GnuTLS manual
 
1855
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1856
        
 
1857
        @gnutls.library.types.gnutls_log_func
 
1858
        def debug_gnutls(level, string):
 
1859
            logger.debug("GnuTLS: %s", string[:-1])
 
1860
        
 
1861
        (gnutls.library.functions
 
1862
         .gnutls_global_set_log_function(debug_gnutls))
 
1863
        
 
1864
        # Redirect stdin so all checkers get /dev/null
 
1865
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1866
        os.dup2(null, sys.stdin.fileno())
 
1867
        if null > 2:
 
1868
            os.close(null)
 
1869
    else:
 
1870
        # No console logging
 
1871
        logger.removeHandler(console)
 
1872
    
 
1873
    # Need to fork before connecting to D-Bus
 
1874
    if not debug:
 
1875
        # Close all input and output, do double fork, etc.
 
1876
        daemon()
746
1877
    
747
1878
    global main_loop
748
 
    global bus
749
 
    global server
750
1879
    # From the Avahi example code
751
1880
    DBusGMainLoop(set_as_default=True )
752
1881
    main_loop = gobject.MainLoop()
753
1882
    bus = dbus.SystemBus()
754
 
    server = dbus.Interface(
755
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
 
            avahi.DBUS_INTERFACE_SERVER )
757
1883
    # End of Avahi example code
758
 
    
759
 
    clients = Set()
760
 
    def remove_from_clients(client):
761
 
        clients.remove(client)
762
 
        if not clients:
763
 
            logger.critical(u"No clients left, exiting")
764
 
            sys.exit()
765
 
    
766
 
    clients.update(Set(Client(name = section,
767
 
                              stop_hook = remove_from_clients,
768
 
                              config
769
 
                              = dict(client_config.items(section)))
770
 
                       for section in client_config.sections()))
771
 
    if not clients:
772
 
        logger.critical(u"No clients defined")
773
 
        sys.exit(1)
774
 
    
 
1884
    if use_dbus:
 
1885
        try:
 
1886
            bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
 
1887
                                            bus, do_not_queue=True)
 
1888
        except dbus.exceptions.NameExistsException as e:
 
1889
            logger.error(unicode(e) + ", disabling D-Bus")
 
1890
            use_dbus = False
 
1891
            server_settings["use_dbus"] = False
 
1892
            tcp_server.use_dbus = False
 
1893
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1894
    service = AvahiService(name = server_settings["servicename"],
 
1895
                           servicetype = "_mandos._tcp",
 
1896
                           protocol = protocol, bus = bus)
 
1897
    if server_settings["interface"]:
 
1898
        service.interface = (if_nametoindex
 
1899
                             (str(server_settings["interface"])))
 
1900
    
 
1901
    global multiprocessing_manager
 
1902
    multiprocessing_manager = multiprocessing.Manager()
 
1903
    
 
1904
    client_class = Client
 
1905
    if use_dbus:
 
1906
        client_class = functools.partial(ClientDBus, bus = bus)
 
1907
    def client_config_items(config, section):
 
1908
        special_settings = {
 
1909
            "approved_by_default":
 
1910
                lambda: config.getboolean(section,
 
1911
                                          "approved_by_default"),
 
1912
            }
 
1913
        for name, value in config.items(section):
 
1914
            try:
 
1915
                yield (name, special_settings[name]())
 
1916
            except KeyError:
 
1917
                yield (name, value)
 
1918
    
 
1919
    tcp_server.clients.update(set(
 
1920
            client_class(name = section,
 
1921
                         config= dict(client_config_items(
 
1922
                        client_config, section)))
 
1923
            for section in client_config.sections()))
 
1924
    if not tcp_server.clients:
 
1925
        logger.warning("No clients defined")
 
1926
        
775
1927
    if not debug:
776
 
        logger.removeHandler(console)
777
 
        daemon()
 
1928
        try:
 
1929
            with pidfile:
 
1930
                pid = os.getpid()
 
1931
                pidfile.write(str(pid) + "\n".encode("utf-8"))
 
1932
            del pidfile
 
1933
        except IOError:
 
1934
            logger.error("Could not write to file %r with PID %d",
 
1935
                         pidfilename, pid)
 
1936
        except NameError:
 
1937
            # "pidfile" was never created
 
1938
            pass
 
1939
        del pidfilename
 
1940
        
 
1941
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1942
 
 
1943
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1944
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
778
1945
    
779
 
    pidfilename = "/var/run/mandos/mandos.pid"
780
 
    pid = os.getpid()
781
 
    try:
782
 
        pidfile = open(pidfilename, "w")
783
 
        pidfile.write(str(pid) + "\n")
784
 
        pidfile.close()
785
 
        del pidfile
786
 
    except IOError, err:
787
 
        logger.error(u"Could not write %s file with PID %d",
788
 
                     pidfilename, os.getpid())
 
1946
    if use_dbus:
 
1947
        class MandosDBusService(dbus.service.Object):
 
1948
            """A D-Bus proxy object"""
 
1949
            def __init__(self):
 
1950
                dbus.service.Object.__init__(self, bus, "/")
 
1951
            _interface = "se.bsnet.fukt.Mandos"
 
1952
            
 
1953
            @dbus.service.signal(_interface, signature="o")
 
1954
            def ClientAdded(self, objpath):
 
1955
                "D-Bus signal"
 
1956
                pass
 
1957
            
 
1958
            @dbus.service.signal(_interface, signature="ss")
 
1959
            def ClientNotFound(self, fingerprint, address):
 
1960
                "D-Bus signal"
 
1961
                pass
 
1962
            
 
1963
            @dbus.service.signal(_interface, signature="os")
 
1964
            def ClientRemoved(self, objpath, name):
 
1965
                "D-Bus signal"
 
1966
                pass
 
1967
            
 
1968
            @dbus.service.method(_interface, out_signature="ao")
 
1969
            def GetAllClients(self):
 
1970
                "D-Bus method"
 
1971
                return dbus.Array(c.dbus_object_path
 
1972
                                  for c in tcp_server.clients)
 
1973
            
 
1974
            @dbus.service.method(_interface,
 
1975
                                 out_signature="a{oa{sv}}")
 
1976
            def GetAllClientsWithProperties(self):
 
1977
                "D-Bus method"
 
1978
                return dbus.Dictionary(
 
1979
                    ((c.dbus_object_path, c.GetAll(""))
 
1980
                     for c in tcp_server.clients),
 
1981
                    signature="oa{sv}")
 
1982
            
 
1983
            @dbus.service.method(_interface, in_signature="o")
 
1984
            def RemoveClient(self, object_path):
 
1985
                "D-Bus method"
 
1986
                for c in tcp_server.clients:
 
1987
                    if c.dbus_object_path == object_path:
 
1988
                        tcp_server.clients.remove(c)
 
1989
                        c.remove_from_connection()
 
1990
                        # Don't signal anything except ClientRemoved
 
1991
                        c.disable(quiet=True)
 
1992
                        # Emit D-Bus signal
 
1993
                        self.ClientRemoved(object_path, c.name)
 
1994
                        return
 
1995
                raise KeyError(object_path)
 
1996
            
 
1997
            del _interface
 
1998
        
 
1999
        mandos_dbus_service = MandosDBusService()
789
2000
    
790
2001
    def cleanup():
791
2002
        "Cleanup function; run on exit"
792
 
        global group
793
 
        # From the Avahi example code
794
 
        if not group is None:
795
 
            group.Free()
796
 
            group = None
797
 
        # End of Avahi example code
 
2003
        service.cleanup()
798
2004
        
799
 
        while clients:
800
 
            client = clients.pop()
801
 
            client.stop_hook = None
802
 
            client.stop()
 
2005
        while tcp_server.clients:
 
2006
            client = tcp_server.clients.pop()
 
2007
            if use_dbus:
 
2008
                client.remove_from_connection()
 
2009
            client.disable_hook = None
 
2010
            # Don't signal anything except ClientRemoved
 
2011
            client.disable(quiet=True)
 
2012
            if use_dbus:
 
2013
                # Emit D-Bus signal
 
2014
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
 
2015
                                                  client.name)
803
2016
    
804
2017
    atexit.register(cleanup)
805
2018
    
806
 
    if not debug:
807
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
808
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
809
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
810
 
    
811
 
    for client in clients:
812
 
        client.start()
813
 
    
814
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
815
 
                                 server_settings["port"]),
816
 
                                tcp_handler,
817
 
                                settings=server_settings,
818
 
                                clients=clients)
 
2019
    for client in tcp_server.clients:
 
2020
        if use_dbus:
 
2021
            # Emit D-Bus signal
 
2022
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
 
2023
        client.enable()
 
2024
    
 
2025
    tcp_server.enable()
 
2026
    tcp_server.server_activate()
 
2027
    
819
2028
    # Find out what port we got
820
2029
    service.port = tcp_server.socket.getsockname()[1]
821
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
2030
    if use_ipv6:
 
2031
        logger.info("Now listening on address %r, port %d,"
 
2032
                    " flowinfo %d, scope_id %d"
 
2033
                    % tcp_server.socket.getsockname())
 
2034
    else:                       # IPv4
 
2035
        logger.info("Now listening on address %r, port %d"
 
2036
                    % tcp_server.socket.getsockname())
823
2037
    
824
2038
    #service.interface = tcp_server.socket.getsockname()[3]
825
2039
    
826
2040
    try:
827
2041
        # From the Avahi example code
828
 
        server.connect_to_signal("StateChanged", server_state_changed)
829
2042
        try:
830
 
            server_state_changed(server.GetState())
831
 
        except dbus.exceptions.DBusException, error:
832
 
            logger.critical(u"DBusException: %s", error)
 
2043
            service.activate()
 
2044
        except dbus.exceptions.DBusException as error:
 
2045
            logger.critical("DBusException: %s", error)
 
2046
            cleanup()
833
2047
            sys.exit(1)
834
2048
        # End of Avahi example code
835
2049
        
836
2050
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
2051
                             lambda *args, **kwargs:
838
 
                             tcp_server.handle_request\
839
 
                             (*args[2:], **kwargs) or True)
 
2052
                             (tcp_server.handle_request
 
2053
                              (*args[2:], **kwargs) or True))
840
2054
        
841
 
        logger.debug(u"Starting main loop")
842
 
        main_loop_started = True
 
2055
        logger.debug("Starting main loop")
843
2056
        main_loop.run()
844
 
    except AvahiError, error:
845
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
2057
    except AvahiError as error:
 
2058
        logger.critical("AvahiError: %s", error)
 
2059
        cleanup()
846
2060
        sys.exit(1)
847
2061
    except KeyboardInterrupt:
848
2062
        if debug:
849
 
            print
 
2063
            print("", file=sys.stderr)
 
2064
        logger.debug("Server received KeyboardInterrupt")
 
2065
    logger.debug("Server exiting")
 
2066
    # Must run before the D-Bus bus name gets deregistered
 
2067
    cleanup()
850
2068
 
851
2069
if __name__ == '__main__':
852
2070
    main()