/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2010-09-12 03:00:40 UTC
  • Revision ID: teddy@fukt.bsnet.se-20100912030040-b0uopyennste9fdh
Documentation changes:

* DBUS-API: New file documenting the server D-Bus interface.

* clients.conf: Add examples of new approval settings.

* debian/mandos.docs: Added "DBUS-API".

* mandos-clients.conf.xml (OPTIONS): Added "approved_by_default",
                                     "approval_delay", and
                                     "approval_duration".
* mandos.xml (D-BUS INTERFACE): Refer to the "DBUS-API" file.
  (BUGS): Remove mention of lack of a remote query interface.

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Lines of Context:
6
6
# This program is partly derived from an example program for an Avahi
7
7
# 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 © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
15
16
16
17
# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
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, with_statement, absolute_import
33
35
 
34
 
import SocketServer
 
36
import SocketServer as socketserver
35
37
import socket
36
 
import select
37
 
from optparse import OptionParser
 
38
import optparse
38
39
import datetime
39
40
import errno
40
41
import gnutls.crypto
43
44
import gnutls.library.functions
44
45
import gnutls.library.constants
45
46
import gnutls.library.types
46
 
import ConfigParser
 
47
import ConfigParser as configparser
47
48
import sys
48
49
import re
49
50
import os
50
51
import signal
51
 
from sets import Set
52
52
import subprocess
53
53
import atexit
54
54
import stat
55
55
import logging
56
56
import logging.handlers
 
57
import pwd
 
58
import contextlib
 
59
import struct
 
60
import fcntl
 
61
import functools
 
62
import cPickle as pickle
 
63
import multiprocessing
57
64
 
58
65
import dbus
 
66
import dbus.service
59
67
import gobject
60
68
import avahi
61
69
from dbus.mainloop.glib import DBusGMainLoop
62
70
import ctypes
63
 
 
64
 
version = "1.0"
65
 
 
66
 
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'))
 
71
import ctypes.util
 
72
import xml.dom.minidom
 
73
import inspect
 
74
 
 
75
try:
 
76
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
77
except AttributeError:
 
78
    try:
 
79
        from IN import SO_BINDTODEVICE
 
80
    except ImportError:
 
81
        SO_BINDTODEVICE = None
 
82
 
 
83
 
 
84
version = "1.0.14"
 
85
 
 
86
#logger = logging.getLogger(u'mandos')
 
87
logger = logging.Logger(u'mandos')
 
88
syslogger = (logging.handlers.SysLogHandler
 
89
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
90
              address = "/dev/log"))
 
91
syslogger.setFormatter(logging.Formatter
 
92
                       (u'Mandos [%(process)d]: %(levelname)s:'
 
93
                        u' %(message)s'))
72
94
logger.addHandler(syslogger)
73
95
 
74
96
console = logging.StreamHandler()
75
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
 
                                       ' %(message)s'))
 
97
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
 
98
                                       u' %(levelname)s:'
 
99
                                       u' %(message)s'))
77
100
logger.addHandler(console)
78
101
 
79
102
class AvahiError(Exception):
80
 
    def __init__(self, value):
 
103
    def __init__(self, value, *args, **kwargs):
81
104
        self.value = value
82
 
    def __str__(self):
83
 
        return repr(self.value)
 
105
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
106
    def __unicode__(self):
 
107
        return unicode(repr(self.value))
84
108
 
85
109
class AvahiServiceError(AvahiError):
86
110
    pass
91
115
 
92
116
class AvahiService(object):
93
117
    """An Avahi (Zeroconf) service.
 
118
    
94
119
    Attributes:
95
120
    interface: integer; avahi.IF_UNSPEC or an interface index.
96
121
               Used to optionally bind to the specified interface.
97
 
    name: string; Example: 'Mandos'
98
 
    type: string; Example: '_mandos._tcp'.
 
122
    name: string; Example: u'Mandos'
 
123
    type: string; Example: u'_mandos._tcp'.
99
124
                  See <http://www.dns-sd.org/ServiceTypes.html>
100
125
    port: integer; what port to announce
101
126
    TXT: list of strings; TXT record for the service
104
129
    max_renames: integer; maximum number of renames
105
130
    rename_count: integer; counter so we only rename after collisions
106
131
                  a sensible number of times
 
132
    group: D-Bus Entry Group
 
133
    server: D-Bus Server
 
134
    bus: dbus.SystemBus()
107
135
    """
108
136
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
 
                 type = None, port = None, TXT = None, domain = "",
110
 
                 host = "", max_renames = 32768):
 
137
                 servicetype = None, port = None, TXT = None,
 
138
                 domain = u"", host = u"", max_renames = 32768,
 
139
                 protocol = avahi.PROTO_UNSPEC, bus = None):
111
140
        self.interface = interface
112
141
        self.name = name
113
 
        self.type = type
 
142
        self.type = servicetype
114
143
        self.port = port
115
 
        if TXT is None:
116
 
            self.TXT = []
117
 
        else:
118
 
            self.TXT = TXT
 
144
        self.TXT = TXT if TXT is not None else []
119
145
        self.domain = domain
120
146
        self.host = host
121
147
        self.rename_count = 0
 
148
        self.max_renames = max_renames
 
149
        self.protocol = protocol
 
150
        self.group = None       # our entry group
 
151
        self.server = None
 
152
        self.bus = bus
122
153
    def rename(self):
123
154
        """Derived from the Avahi example code"""
124
155
        if self.rename_count >= self.max_renames:
125
 
            logger.critical(u"No suitable service name found after %i"
126
 
                            u" retries, exiting.", rename_count)
127
 
            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))
 
156
            logger.critical(u"No suitable Zeroconf service name found"
 
157
                            u" after %i retries, exiting.",
 
158
                            self.rename_count)
 
159
            raise AvahiServiceError(u"Too many renames")
 
160
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
 
161
        logger.info(u"Changing Zeroconf service name to %r ...",
 
162
                    self.name)
 
163
        syslogger.setFormatter(logging.Formatter
 
164
                               (u'Mandos (%s) [%%(process)d]:'
 
165
                                u' %%(levelname)s: %%(message)s'
 
166
                                % self.name))
133
167
        self.remove()
134
 
        self.add()
 
168
        try:
 
169
            self.add()
 
170
        except dbus.exceptions.DBusException, error:
 
171
            logger.critical(u"DBusException: %s", error)
 
172
            self.cleanup()
 
173
            os._exit(1)
135
174
        self.rename_count += 1
136
175
    def remove(self):
137
176
        """Derived from the Avahi example code"""
138
 
        if group is not None:
139
 
            group.Reset()
 
177
        if self.group is not None:
 
178
            self.group.Reset()
140
179
    def add(self):
141
180
        """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
 
181
        if self.group is None:
 
182
            self.group = dbus.Interface(
 
183
                self.bus.get_object(avahi.DBUS_NAME,
 
184
                                    self.server.EntryGroupNew()),
 
185
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
186
            self.group.connect_to_signal('StateChanged',
 
187
                                         self
 
188
                                         .entry_group_state_changed)
 
189
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
190
                     self.name, self.type)
 
191
        self.group.AddService(
 
192
            self.interface,
 
193
            self.protocol,
 
194
            dbus.UInt32(0),     # flags
 
195
            self.name, self.type,
 
196
            self.domain, self.host,
 
197
            dbus.UInt16(self.port),
 
198
            avahi.string_array_to_txt_array(self.TXT))
 
199
        self.group.Commit()
 
200
    def entry_group_state_changed(self, state, error):
 
201
        """Derived from the Avahi example code"""
 
202
        logger.debug(u"Avahi entry group state change: %i", state)
 
203
        
 
204
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
205
            logger.debug(u"Zeroconf service established.")
 
206
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
207
            logger.warning(u"Zeroconf service name collision.")
 
208
            self.rename()
 
209
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
210
            logger.critical(u"Avahi: Error in group state changed %s",
 
211
                            unicode(error))
 
212
            raise AvahiGroupError(u"State changed: %s"
 
213
                                  % unicode(error))
 
214
    def cleanup(self):
 
215
        """Derived from the Avahi example code"""
 
216
        if self.group is not None:
 
217
            self.group.Free()
 
218
            self.group = None
 
219
    def server_state_changed(self, state):
 
220
        """Derived from the Avahi example code"""
 
221
        logger.debug(u"Avahi server state change: %i", state)
 
222
        if state == avahi.SERVER_COLLISION:
 
223
            logger.error(u"Zeroconf server name collision")
 
224
            self.remove()
 
225
        elif state == avahi.SERVER_RUNNING:
 
226
            self.add()
 
227
    def activate(self):
 
228
        """Derived from the Avahi example code"""
 
229
        if self.server is None:
 
230
            self.server = dbus.Interface(
 
231
                self.bus.get_object(avahi.DBUS_NAME,
 
232
                                    avahi.DBUS_PATH_SERVER),
 
233
                avahi.DBUS_INTERFACE_SERVER)
 
234
        self.server.connect_to_signal(u"StateChanged",
 
235
                                 self.server_state_changed)
 
236
        self.server_state_changed(self.server.GetState())
165
237
 
166
238
 
167
239
class Client(object):
168
240
    """A representation of a client host served by this server.
 
241
    
169
242
    Attributes:
170
 
    name:      string; from the config file, used in log messages
 
243
    name:       string; from the config file, used in log messages and
 
244
                        D-Bus identifiers
171
245
    fingerprint: string (40 or 32 hexadecimal digits); used to
172
246
                 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.
 
247
    secret:     bytestring; sent verbatim (over TLS) to client
 
248
    host:       string; available for use by the checker command
 
249
    created:    datetime.datetime(); (UTC) object creation
 
250
    last_enabled: datetime.datetime(); (UTC)
 
251
    enabled:    bool()
 
252
    last_checked_ok: datetime.datetime(); (UTC) or None
 
253
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
254
                                      until this client is disabled
 
255
    interval:   datetime.timedelta(); How often to start a new checker
 
256
    disable_hook:  If set, called by disable() as disable_hook(self)
 
257
    checker:    subprocess.Popen(); a running checker process used
 
258
                                    to see if the client lives.
 
259
                                    'None' if no process is running.
184
260
    checker_initiator_tag: a gobject event source tag, or None
185
 
    stop_initiator_tag:    - '' -
 
261
    disable_initiator_tag: - '' -
186
262
    checker_callback_tag:  - '' -
187
263
    checker_command: string; External command which is run to check if
188
264
                     client lives.  %() expansions are done at
189
265
                     runtime with vars(self) as dict, so that for
190
266
                     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: - '' -
 
267
    current_checker_command: string; current running checker_command
 
268
    approval_delay: datetime.timedelta(); Time to wait for approval
 
269
    _approved:   bool(); 'None' if not yet approved/disapproved
 
270
    approval_duration: datetime.timedelta(); Duration of one approval
196
271
    """
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={}):
 
272
    
 
273
    @staticmethod
 
274
    def _timedelta_to_milliseconds(td):
 
275
        "Convert a datetime.timedelta() to milliseconds"
 
276
        return ((td.days * 24 * 60 * 60 * 1000)
 
277
                + (td.seconds * 1000)
 
278
                + (td.microseconds // 1000))
 
279
    
 
280
    def timeout_milliseconds(self):
 
281
        "Return the 'timeout' attribute in milliseconds"
 
282
        return self._timedelta_to_milliseconds(self.timeout)
 
283
    
 
284
    def interval_milliseconds(self):
 
285
        "Return the 'interval' attribute in milliseconds"
 
286
        return self._timedelta_to_milliseconds(self.interval)
 
287
 
 
288
    def approval_delay_milliseconds(self):
 
289
        return self._timedelta_to_milliseconds(self.approval_delay)
 
290
    
 
291
    def __init__(self, name = None, disable_hook=None, config=None):
221
292
        """Note: the 'checker' key in 'config' sets the
222
293
        'checker_command' attribute and *not* the 'checker'
223
294
        attribute."""
224
295
        self.name = name
 
296
        if config is None:
 
297
            config = {}
225
298
        logger.debug(u"Creating client %r", self.name)
226
299
        # Uppercase and remove spaces from fingerprint for later
227
300
        # comparison purposes with return value from the fingerprint()
228
301
        # function
229
 
        self.fingerprint = config["fingerprint"].upper()\
230
 
                           .replace(u" ", u"")
 
302
        self.fingerprint = (config[u"fingerprint"].upper()
 
303
                            .replace(u" ", u""))
231
304
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
232
 
        if "secret" in config:
233
 
            self.secret = config["secret"].decode(u"base64")
234
 
        elif "secfile" in config:
235
 
            sf = open(config["secfile"])
236
 
            self.secret = sf.read()
237
 
            sf.close()
 
305
        if u"secret" in config:
 
306
            self.secret = config[u"secret"].decode(u"base64")
 
307
        elif u"secfile" in config:
 
308
            with open(os.path.expanduser(os.path.expandvars
 
309
                                         (config[u"secfile"])),
 
310
                      "rb") as secfile:
 
311
                self.secret = secfile.read()
238
312
        else:
239
313
            raise TypeError(u"No secret or secfile for client %s"
240
314
                            % self.name)
241
 
        self.host = config.get("host", "")
242
 
        self.created = datetime.datetime.now()
 
315
        self.host = config.get(u"host", u"")
 
316
        self.created = datetime.datetime.utcnow()
 
317
        self.enabled = False
 
318
        self.last_enabled = None
243
319
        self.last_checked_ok = None
244
 
        self.timeout = string_to_delta(config["timeout"])
245
 
        self.interval = string_to_delta(config["interval"])
246
 
        self.stop_hook = stop_hook
 
320
        self.timeout = string_to_delta(config[u"timeout"])
 
321
        self.interval = string_to_delta(config[u"interval"])
 
322
        self.disable_hook = disable_hook
247
323
        self.checker = None
248
324
        self.checker_initiator_tag = None
249
 
        self.stop_initiator_tag = None
 
325
        self.disable_initiator_tag = None
250
326
        self.checker_callback_tag = None
251
 
        self.check_command = config["checker"]
252
 
    def start(self):
 
327
        self.checker_command = config[u"checker"]
 
328
        self.current_checker_command = None
 
329
        self.last_connect = None
 
330
        self._approved = None
 
331
        self.approved_by_default = config.get(u"approved_by_default",
 
332
                                              True)
 
333
        self.approvals_pending = 0
 
334
        self.approval_delay = string_to_delta(
 
335
            config[u"approval_delay"])
 
336
        self.approval_duration = string_to_delta(
 
337
            config[u"approval_duration"])
 
338
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
 
339
    
 
340
    def send_changedstate(self):
 
341
        self.changedstate.acquire()
 
342
        self.changedstate.notify_all()
 
343
        self.changedstate.release()
 
344
        
 
345
    def enable(self):
253
346
        """Start this client's checker and timeout hooks"""
 
347
        if getattr(self, u"enabled", False):
 
348
            # Already enabled
 
349
            return
 
350
        self.send_changedstate()
 
351
        self.last_enabled = datetime.datetime.utcnow()
254
352
        # Schedule a new checker to be started an 'interval' from now,
255
353
        # and every interval from then on.
256
 
        self.checker_initiator_tag = gobject.timeout_add\
257
 
                                     (self._interval_milliseconds,
258
 
                                      self.start_checker)
 
354
        self.checker_initiator_tag = (gobject.timeout_add
 
355
                                      (self.interval_milliseconds(),
 
356
                                       self.start_checker))
 
357
        # Schedule a disable() when 'timeout' has passed
 
358
        self.disable_initiator_tag = (gobject.timeout_add
 
359
                                   (self.timeout_milliseconds(),
 
360
                                    self.disable))
 
361
        self.enabled = True
259
362
        # Also start a new checker *right now*.
260
363
        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:
 
364
    
 
365
    def disable(self, quiet=True):
 
366
        """Disable this client."""
 
367
        if not getattr(self, "enabled", False):
274
368
            return False
275
 
        if getattr(self, "stop_initiator_tag", False):
276
 
            gobject.source_remove(self.stop_initiator_tag)
277
 
            self.stop_initiator_tag = None
278
 
        if getattr(self, "checker_initiator_tag", False):
 
369
        if not quiet:
 
370
            self.send_changedstate()
 
371
        if not quiet:
 
372
            logger.info(u"Disabling client %s", self.name)
 
373
        if getattr(self, u"disable_initiator_tag", False):
 
374
            gobject.source_remove(self.disable_initiator_tag)
 
375
            self.disable_initiator_tag = None
 
376
        if getattr(self, u"checker_initiator_tag", False):
279
377
            gobject.source_remove(self.checker_initiator_tag)
280
378
            self.checker_initiator_tag = None
281
379
        self.stop_checker()
282
 
        if self.stop_hook:
283
 
            self.stop_hook(self)
 
380
        if self.disable_hook:
 
381
            self.disable_hook(self)
 
382
        self.enabled = False
284
383
        # Do not run this again if called by a gobject.timeout_add
285
384
        return False
 
385
    
286
386
    def __del__(self):
287
 
        self.stop_hook = None
288
 
        self.stop()
289
 
    def checker_callback(self, pid, condition):
 
387
        self.disable_hook = None
 
388
        self.disable()
 
389
    
 
390
    def checker_callback(self, pid, condition, command):
290
391
        """The checker has completed, so take appropriate actions."""
291
 
        now = datetime.datetime.now()
292
392
        self.checker_callback_tag = None
293
393
        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):
 
394
        if os.WIFEXITED(condition):
 
395
            exitstatus = os.WEXITSTATUS(condition)
 
396
            if exitstatus == 0:
 
397
                logger.info(u"Checker for %(name)s succeeded",
 
398
                            vars(self))
 
399
                self.checked_ok()
 
400
            else:
 
401
                logger.info(u"Checker for %(name)s failed",
 
402
                            vars(self))
 
403
        else:
304
404
            logger.warning(u"Checker for %(name)s crashed?",
305
405
                           vars(self))
306
 
        else:
307
 
            logger.info(u"Checker for %(name)s failed",
308
 
                        vars(self))
 
406
    
 
407
    def checked_ok(self):
 
408
        """Bump up the timeout for this client.
 
409
        
 
410
        This should only be called when the client has been seen,
 
411
        alive and well.
 
412
        """
 
413
        self.last_checked_ok = datetime.datetime.utcnow()
 
414
        gobject.source_remove(self.disable_initiator_tag)
 
415
        self.disable_initiator_tag = (gobject.timeout_add
 
416
                                      (self.timeout_milliseconds(),
 
417
                                       self.disable))
 
418
    
309
419
    def start_checker(self):
310
420
        """Start a new checker subprocess if one is not running.
 
421
        
311
422
        If a checker already exists, leave it running and do
312
423
        nothing."""
313
424
        # The reason for not killing a running checker is that if we
316
427
        # client would inevitably timeout, since no checker would get
317
428
        # a chance to run to completion.  If we instead leave running
318
429
        # 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.
 
430
        # than 'timeout' for the client to be disabled, which is as it
 
431
        # should be.
 
432
        
 
433
        # If a checker exists, make sure it is not a zombie
 
434
        try:
 
435
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
436
        except (AttributeError, OSError), error:
 
437
            if (isinstance(error, OSError)
 
438
                and error.errno != errno.ECHILD):
 
439
                raise error
 
440
        else:
 
441
            if pid:
 
442
                logger.warning(u"Checker was a zombie")
 
443
                gobject.source_remove(self.checker_callback_tag)
 
444
                self.checker_callback(pid, status,
 
445
                                      self.current_checker_command)
 
446
        # Start a new checker if needed
321
447
        if self.checker is None:
322
448
            try:
323
 
                # In case check_command has exactly one % operator
324
 
                command = self.check_command % self.host
 
449
                # In case checker_command has exactly one % operator
 
450
                command = self.checker_command % self.host
325
451
            except TypeError:
326
452
                # Escape attributes for the shell
327
 
                escaped_attrs = dict((key, re.escape(str(val)))
 
453
                escaped_attrs = dict((key,
 
454
                                      re.escape(unicode(str(val),
 
455
                                                        errors=
 
456
                                                        u'replace')))
328
457
                                     for key, val in
329
458
                                     vars(self).iteritems())
330
459
                try:
331
 
                    command = self.check_command % escaped_attrs
 
460
                    command = self.checker_command % escaped_attrs
332
461
                except TypeError, error:
333
462
                    logger.error(u'Could not format string "%s":'
334
 
                                 u' %s', self.check_command, error)
 
463
                                 u' %s', self.checker_command, error)
335
464
                    return True # Try again later
 
465
            self.current_checker_command = command
336
466
            try:
337
467
                logger.info(u"Starting checker %r for %s",
338
468
                            command, self.name)
 
469
                # We don't need to redirect stdout and stderr, since
 
470
                # in normal mode, that is already done by daemon(),
 
471
                # and in debug mode we don't want to.  (Stdin is
 
472
                # always replaced by /dev/null.)
339
473
                self.checker = subprocess.Popen(command,
340
474
                                                close_fds=True,
341
 
                                                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:
 
475
                                                shell=True, cwd=u"/")
 
476
                self.checker_callback_tag = (gobject.child_watch_add
 
477
                                             (self.checker.pid,
 
478
                                              self.checker_callback,
 
479
                                              data=command))
 
480
                # The checker may have completed before the gobject
 
481
                # watch was added.  Check for this.
 
482
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
483
                if pid:
 
484
                    gobject.source_remove(self.checker_callback_tag)
 
485
                    self.checker_callback(pid, status, command)
 
486
            except OSError, error:
346
487
                logger.error(u"Failed to start subprocess: %s",
347
488
                             error)
348
489
        # Re-run this periodically if run by gobject.timeout_add
349
490
        return True
 
491
    
350
492
    def stop_checker(self):
351
493
        """Force the checker process, if any, to stop."""
352
494
        if self.checker_callback_tag:
353
495
            gobject.source_remove(self.checker_callback_tag)
354
496
            self.checker_callback_tag = None
355
 
        if getattr(self, "checker", None) is None:
 
497
        if getattr(self, u"checker", None) is None:
356
498
            return
357
499
        logger.debug(u"Stopping checker for %(name)s", vars(self))
358
500
        try:
359
501
            os.kill(self.checker.pid, signal.SIGTERM)
360
 
            #os.sleep(0.5)
 
502
            #time.sleep(0.5)
361
503
            #if self.checker.poll() is None:
362
504
            #    os.kill(self.checker.pid, signal.SIGKILL)
363
505
        except OSError, error:
364
506
            if error.errno != errno.ESRCH: # No such process
365
507
                raise
366
508
        self.checker = None
367
 
    def still_valid(self):
368
 
        """Has the timeout not yet passed for this client?"""
369
 
        now = datetime.datetime.now()
 
509
 
 
510
def dbus_service_property(dbus_interface, signature=u"v",
 
511
                          access=u"readwrite", byte_arrays=False):
 
512
    """Decorators for marking methods of a DBusObjectWithProperties to
 
513
    become properties on the D-Bus.
 
514
    
 
515
    The decorated method will be called with no arguments by "Get"
 
516
    and with one argument by "Set".
 
517
    
 
518
    The parameters, where they are supported, are the same as
 
519
    dbus.service.method, except there is only "signature", since the
 
520
    type from Get() and the type sent to Set() is the same.
 
521
    """
 
522
    # Encoding deeply encoded byte arrays is not supported yet by the
 
523
    # "Set" method, so we fail early here:
 
524
    if byte_arrays and signature != u"ay":
 
525
        raise ValueError(u"Byte arrays not supported for non-'ay'"
 
526
                         u" signature %r" % signature)
 
527
    def decorator(func):
 
528
        func._dbus_is_property = True
 
529
        func._dbus_interface = dbus_interface
 
530
        func._dbus_signature = signature
 
531
        func._dbus_access = access
 
532
        func._dbus_name = func.__name__
 
533
        if func._dbus_name.endswith(u"_dbus_property"):
 
534
            func._dbus_name = func._dbus_name[:-14]
 
535
        func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
 
536
        return func
 
537
    return decorator
 
538
 
 
539
 
 
540
class DBusPropertyException(dbus.exceptions.DBusException):
 
541
    """A base class for D-Bus property-related exceptions
 
542
    """
 
543
    def __unicode__(self):
 
544
        return unicode(str(self))
 
545
 
 
546
 
 
547
class DBusPropertyAccessException(DBusPropertyException):
 
548
    """A property's access permissions disallows an operation.
 
549
    """
 
550
    pass
 
551
 
 
552
 
 
553
class DBusPropertyNotFound(DBusPropertyException):
 
554
    """An attempt was made to access a non-existing property.
 
555
    """
 
556
    pass
 
557
 
 
558
 
 
559
class DBusObjectWithProperties(dbus.service.Object):
 
560
    """A D-Bus object with properties.
 
561
 
 
562
    Classes inheriting from this can use the dbus_service_property
 
563
    decorator to expose methods as D-Bus properties.  It exposes the
 
564
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
565
    """
 
566
    
 
567
    @staticmethod
 
568
    def _is_dbus_property(obj):
 
569
        return getattr(obj, u"_dbus_is_property", False)
 
570
    
 
571
    def _get_all_dbus_properties(self):
 
572
        """Returns a generator of (name, attribute) pairs
 
573
        """
 
574
        return ((prop._dbus_name, prop)
 
575
                for name, prop in
 
576
                inspect.getmembers(self, self._is_dbus_property))
 
577
    
 
578
    def _get_dbus_property(self, interface_name, property_name):
 
579
        """Returns a bound method if one exists which is a D-Bus
 
580
        property with the specified name and interface.
 
581
        """
 
582
        for name in (property_name,
 
583
                     property_name + u"_dbus_property"):
 
584
            prop = getattr(self, name, None)
 
585
            if (prop is None
 
586
                or not self._is_dbus_property(prop)
 
587
                or prop._dbus_name != property_name
 
588
                or (interface_name and prop._dbus_interface
 
589
                    and interface_name != prop._dbus_interface)):
 
590
                continue
 
591
            return prop
 
592
        # No such property
 
593
        raise DBusPropertyNotFound(self.dbus_object_path + u":"
 
594
                                   + interface_name + u"."
 
595
                                   + property_name)
 
596
    
 
597
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
 
598
                         out_signature=u"v")
 
599
    def Get(self, interface_name, property_name):
 
600
        """Standard D-Bus property Get() method, see D-Bus standard.
 
601
        """
 
602
        prop = self._get_dbus_property(interface_name, property_name)
 
603
        if prop._dbus_access == u"write":
 
604
            raise DBusPropertyAccessException(property_name)
 
605
        value = prop()
 
606
        if not hasattr(value, u"variant_level"):
 
607
            return value
 
608
        return type(value)(value, variant_level=value.variant_level+1)
 
609
    
 
610
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
 
611
    def Set(self, interface_name, property_name, value):
 
612
        """Standard D-Bus property Set() method, see D-Bus standard.
 
613
        """
 
614
        prop = self._get_dbus_property(interface_name, property_name)
 
615
        if prop._dbus_access == u"read":
 
616
            raise DBusPropertyAccessException(property_name)
 
617
        if prop._dbus_get_args_options[u"byte_arrays"]:
 
618
            # The byte_arrays option is not supported yet on
 
619
            # signatures other than "ay".
 
620
            if prop._dbus_signature != u"ay":
 
621
                raise ValueError
 
622
            value = dbus.ByteArray(''.join(unichr(byte)
 
623
                                           for byte in value))
 
624
        prop(value)
 
625
    
 
626
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
 
627
                         out_signature=u"a{sv}")
 
628
    def GetAll(self, interface_name):
 
629
        """Standard D-Bus property GetAll() method, see D-Bus
 
630
        standard.
 
631
 
 
632
        Note: Will not include properties with access="write".
 
633
        """
 
634
        all = {}
 
635
        for name, prop in self._get_all_dbus_properties():
 
636
            if (interface_name
 
637
                and interface_name != prop._dbus_interface):
 
638
                # Interface non-empty but did not match
 
639
                continue
 
640
            # Ignore write-only properties
 
641
            if prop._dbus_access == u"write":
 
642
                continue
 
643
            value = prop()
 
644
            if not hasattr(value, u"variant_level"):
 
645
                all[name] = value
 
646
                continue
 
647
            all[name] = type(value)(value, variant_level=
 
648
                                    value.variant_level+1)
 
649
        return dbus.Dictionary(all, signature=u"sv")
 
650
    
 
651
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
652
                         out_signature=u"s",
 
653
                         path_keyword='object_path',
 
654
                         connection_keyword='connection')
 
655
    def Introspect(self, object_path, connection):
 
656
        """Standard D-Bus method, overloaded to insert property tags.
 
657
        """
 
658
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
659
                                                   connection)
 
660
        try:
 
661
            document = xml.dom.minidom.parseString(xmlstring)
 
662
            def make_tag(document, name, prop):
 
663
                e = document.createElement(u"property")
 
664
                e.setAttribute(u"name", name)
 
665
                e.setAttribute(u"type", prop._dbus_signature)
 
666
                e.setAttribute(u"access", prop._dbus_access)
 
667
                return e
 
668
            for if_tag in document.getElementsByTagName(u"interface"):
 
669
                for tag in (make_tag(document, name, prop)
 
670
                            for name, prop
 
671
                            in self._get_all_dbus_properties()
 
672
                            if prop._dbus_interface
 
673
                            == if_tag.getAttribute(u"name")):
 
674
                    if_tag.appendChild(tag)
 
675
                # Add the names to the return values for the
 
676
                # "org.freedesktop.DBus.Properties" methods
 
677
                if (if_tag.getAttribute(u"name")
 
678
                    == u"org.freedesktop.DBus.Properties"):
 
679
                    for cn in if_tag.getElementsByTagName(u"method"):
 
680
                        if cn.getAttribute(u"name") == u"Get":
 
681
                            for arg in cn.getElementsByTagName(u"arg"):
 
682
                                if (arg.getAttribute(u"direction")
 
683
                                    == u"out"):
 
684
                                    arg.setAttribute(u"name", u"value")
 
685
                        elif cn.getAttribute(u"name") == u"GetAll":
 
686
                            for arg in cn.getElementsByTagName(u"arg"):
 
687
                                if (arg.getAttribute(u"direction")
 
688
                                    == u"out"):
 
689
                                    arg.setAttribute(u"name", u"props")
 
690
            xmlstring = document.toxml(u"utf-8")
 
691
            document.unlink()
 
692
        except (AttributeError, xml.dom.DOMException,
 
693
                xml.parsers.expat.ExpatError), error:
 
694
            logger.error(u"Failed to override Introspection method",
 
695
                         error)
 
696
        return xmlstring
 
697
 
 
698
 
 
699
class ClientDBus(Client, DBusObjectWithProperties):
 
700
    """A Client class using D-Bus
 
701
    
 
702
    Attributes:
 
703
    dbus_object_path: dbus.ObjectPath
 
704
    bus: dbus.SystemBus()
 
705
    """
 
706
    # dbus.service.Object doesn't use super(), so we can't either.
 
707
    
 
708
    def __init__(self, bus = None, *args, **kwargs):
 
709
        self._approvals_pending = 0
 
710
        self.bus = bus
 
711
        Client.__init__(self, *args, **kwargs)
 
712
        # Only now, when this client is initialized, can it show up on
 
713
        # the D-Bus
 
714
        self.dbus_object_path = (dbus.ObjectPath
 
715
                                 (u"/clients/"
 
716
                                  + self.name.replace(u".", u"_")))
 
717
        DBusObjectWithProperties.__init__(self, self.bus,
 
718
                                          self.dbus_object_path)
 
719
        
 
720
    def _get_approvals_pending(self):
 
721
        return self._approvals_pending
 
722
    def _set_approvals_pending(self, value):
 
723
        old_value = self._approvals_pending
 
724
        self._approvals_pending = value
 
725
        bval = bool(value)
 
726
        if (hasattr(self, "dbus_object_path")
 
727
            and bval is not bool(old_value)):
 
728
            dbus_bool = dbus.Boolean(bval, variant_level=1)
 
729
            self.PropertyChanged(dbus.String(u"ApprovalPending"),
 
730
                                 dbus_bool)
 
731
 
 
732
    approvals_pending = property(_get_approvals_pending,
 
733
                                 _set_approvals_pending)
 
734
    del _get_approvals_pending, _set_approvals_pending
 
735
    
 
736
    @staticmethod
 
737
    def _datetime_to_dbus(dt, variant_level=0):
 
738
        """Convert a UTC datetime.datetime() to a D-Bus type."""
 
739
        return dbus.String(dt.isoformat(),
 
740
                           variant_level=variant_level)
 
741
    
 
742
    def enable(self):
 
743
        oldstate = getattr(self, u"enabled", False)
 
744
        r = Client.enable(self)
 
745
        if oldstate != self.enabled:
 
746
            # Emit D-Bus signals
 
747
            self.PropertyChanged(dbus.String(u"Enabled"),
 
748
                                 dbus.Boolean(True, variant_level=1))
 
749
            self.PropertyChanged(
 
750
                dbus.String(u"LastEnabled"),
 
751
                self._datetime_to_dbus(self.last_enabled,
 
752
                                       variant_level=1))
 
753
        return r
 
754
    
 
755
    def disable(self, quiet = False):
 
756
        oldstate = getattr(self, u"enabled", False)
 
757
        r = Client.disable(self, quiet=quiet)
 
758
        if not quiet and oldstate != self.enabled:
 
759
            # Emit D-Bus signal
 
760
            self.PropertyChanged(dbus.String(u"Enabled"),
 
761
                                 dbus.Boolean(False, variant_level=1))
 
762
        return r
 
763
    
 
764
    def __del__(self, *args, **kwargs):
 
765
        try:
 
766
            self.remove_from_connection()
 
767
        except LookupError:
 
768
            pass
 
769
        if hasattr(DBusObjectWithProperties, u"__del__"):
 
770
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
771
        Client.__del__(self, *args, **kwargs)
 
772
    
 
773
    def checker_callback(self, pid, condition, command,
 
774
                         *args, **kwargs):
 
775
        self.checker_callback_tag = None
 
776
        self.checker = None
 
777
        # Emit D-Bus signal
 
778
        self.PropertyChanged(dbus.String(u"CheckerRunning"),
 
779
                             dbus.Boolean(False, variant_level=1))
 
780
        if os.WIFEXITED(condition):
 
781
            exitstatus = os.WEXITSTATUS(condition)
 
782
            # Emit D-Bus signal
 
783
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
784
                                  dbus.Int64(condition),
 
785
                                  dbus.String(command))
 
786
        else:
 
787
            # Emit D-Bus signal
 
788
            self.CheckerCompleted(dbus.Int16(-1),
 
789
                                  dbus.Int64(condition),
 
790
                                  dbus.String(command))
 
791
        
 
792
        return Client.checker_callback(self, pid, condition, command,
 
793
                                       *args, **kwargs)
 
794
    
 
795
    def checked_ok(self, *args, **kwargs):
 
796
        r = Client.checked_ok(self, *args, **kwargs)
 
797
        # Emit D-Bus signal
 
798
        self.PropertyChanged(
 
799
            dbus.String(u"LastCheckedOK"),
 
800
            (self._datetime_to_dbus(self.last_checked_ok,
 
801
                                    variant_level=1)))
 
802
        return r
 
803
    
 
804
    def start_checker(self, *args, **kwargs):
 
805
        old_checker = self.checker
 
806
        if self.checker is not None:
 
807
            old_checker_pid = self.checker.pid
 
808
        else:
 
809
            old_checker_pid = None
 
810
        r = Client.start_checker(self, *args, **kwargs)
 
811
        # Only if new checker process was started
 
812
        if (self.checker is not None
 
813
            and old_checker_pid != self.checker.pid):
 
814
            # Emit D-Bus signal
 
815
            self.CheckerStarted(self.current_checker_command)
 
816
            self.PropertyChanged(
 
817
                dbus.String(u"CheckerRunning"),
 
818
                dbus.Boolean(True, variant_level=1))
 
819
        return r
 
820
    
 
821
    def stop_checker(self, *args, **kwargs):
 
822
        old_checker = getattr(self, u"checker", None)
 
823
        r = Client.stop_checker(self, *args, **kwargs)
 
824
        if (old_checker is not None
 
825
            and getattr(self, u"checker", None) is None):
 
826
            self.PropertyChanged(dbus.String(u"CheckerRunning"),
 
827
                                 dbus.Boolean(False, variant_level=1))
 
828
        return r
 
829
 
 
830
    def _reset_approved(self):
 
831
        self._approved = None
 
832
        return False
 
833
    
 
834
    def approve(self, value=True):
 
835
        self.send_changedstate()
 
836
        self._approved = value
 
837
        gobject.timeout_add(self._timedelta_to_milliseconds
 
838
                            (self.approval_duration),
 
839
                            self._reset_approved)
 
840
    
 
841
    
 
842
    ## D-Bus methods, signals & properties
 
843
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
844
    
 
845
    ## Signals
 
846
    
 
847
    # CheckerCompleted - signal
 
848
    @dbus.service.signal(_interface, signature=u"nxs")
 
849
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
850
        "D-Bus signal"
 
851
        pass
 
852
    
 
853
    # CheckerStarted - signal
 
854
    @dbus.service.signal(_interface, signature=u"s")
 
855
    def CheckerStarted(self, command):
 
856
        "D-Bus signal"
 
857
        pass
 
858
    
 
859
    # PropertyChanged - signal
 
860
    @dbus.service.signal(_interface, signature=u"sv")
 
861
    def PropertyChanged(self, property, value):
 
862
        "D-Bus signal"
 
863
        pass
 
864
    
 
865
    # GotSecret - signal
 
866
    @dbus.service.signal(_interface)
 
867
    def GotSecret(self):
 
868
        """D-Bus signal
 
869
        Is sent after a successful transfer of secret from the Mandos
 
870
        server to mandos-client
 
871
        """
 
872
        pass
 
873
    
 
874
    # Rejected - signal
 
875
    @dbus.service.signal(_interface, signature=u"s")
 
876
    def Rejected(self, reason):
 
877
        "D-Bus signal"
 
878
        pass
 
879
    
 
880
    # NeedApproval - signal
 
881
    @dbus.service.signal(_interface, signature=u"tb")
 
882
    def NeedApproval(self, timeout, default):
 
883
        "D-Bus signal"
 
884
        pass
 
885
    
 
886
    ## Methods
 
887
 
 
888
    # Approve - method
 
889
    @dbus.service.method(_interface, in_signature=u"b")
 
890
    def Approve(self, value):
 
891
        self.approve(value)
 
892
 
 
893
    # CheckedOK - method
 
894
    @dbus.service.method(_interface)
 
895
    def CheckedOK(self):
 
896
        return self.checked_ok()
 
897
    
 
898
    # Enable - method
 
899
    @dbus.service.method(_interface)
 
900
    def Enable(self):
 
901
        "D-Bus method"
 
902
        self.enable()
 
903
    
 
904
    # StartChecker - method
 
905
    @dbus.service.method(_interface)
 
906
    def StartChecker(self):
 
907
        "D-Bus method"
 
908
        self.start_checker()
 
909
    
 
910
    # Disable - method
 
911
    @dbus.service.method(_interface)
 
912
    def Disable(self):
 
913
        "D-Bus method"
 
914
        self.disable()
 
915
    
 
916
    # StopChecker - method
 
917
    @dbus.service.method(_interface)
 
918
    def StopChecker(self):
 
919
        self.stop_checker()
 
920
    
 
921
    ## Properties
 
922
    
 
923
    # ApprovalPending - property
 
924
    @dbus_service_property(_interface, signature=u"b", access=u"read")
 
925
    def ApprovalPending_dbus_property(self):
 
926
        return dbus.Boolean(bool(self.approvals_pending))
 
927
    
 
928
    # ApprovedByDefault - property
 
929
    @dbus_service_property(_interface, signature=u"b",
 
930
                           access=u"readwrite")
 
931
    def ApprovedByDefault_dbus_property(self, value=None):
 
932
        if value is None:       # get
 
933
            return dbus.Boolean(self.approved_by_default)
 
934
        self.approved_by_default = bool(value)
 
935
        # Emit D-Bus signal
 
936
        self.PropertyChanged(dbus.String(u"ApprovedByDefault"),
 
937
                             dbus.Boolean(value, variant_level=1))
 
938
    
 
939
    # ApprovalDelay - property
 
940
    @dbus_service_property(_interface, signature=u"t",
 
941
                           access=u"readwrite")
 
942
    def ApprovalDelay_dbus_property(self, value=None):
 
943
        if value is None:       # get
 
944
            return dbus.UInt64(self.approval_delay_milliseconds())
 
945
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
946
        # Emit D-Bus signal
 
947
        self.PropertyChanged(dbus.String(u"ApprovalDelay"),
 
948
                             dbus.UInt64(value, variant_level=1))
 
949
    
 
950
    # ApprovalDuration - property
 
951
    @dbus_service_property(_interface, signature=u"t",
 
952
                           access=u"readwrite")
 
953
    def ApprovalDuration_dbus_property(self, value=None):
 
954
        if value is None:       # get
 
955
            return dbus.UInt64(self._timedelta_to_milliseconds(
 
956
                    self.approval_duration))
 
957
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
958
        # Emit D-Bus signal
 
959
        self.PropertyChanged(dbus.String(u"ApprovalDuration"),
 
960
                             dbus.UInt64(value, variant_level=1))
 
961
    
 
962
    # Name - property
 
963
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
964
    def Name_dbus_property(self):
 
965
        return dbus.String(self.name)
 
966
    
 
967
    # Fingerprint - property
 
968
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
969
    def Fingerprint_dbus_property(self):
 
970
        return dbus.String(self.fingerprint)
 
971
    
 
972
    # Host - property
 
973
    @dbus_service_property(_interface, signature=u"s",
 
974
                           access=u"readwrite")
 
975
    def Host_dbus_property(self, value=None):
 
976
        if value is None:       # get
 
977
            return dbus.String(self.host)
 
978
        self.host = value
 
979
        # Emit D-Bus signal
 
980
        self.PropertyChanged(dbus.String(u"Host"),
 
981
                             dbus.String(value, variant_level=1))
 
982
    
 
983
    # Created - property
 
984
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
985
    def Created_dbus_property(self):
 
986
        return dbus.String(self._datetime_to_dbus(self.created))
 
987
    
 
988
    # LastEnabled - property
 
989
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
990
    def LastEnabled_dbus_property(self):
 
991
        if self.last_enabled is None:
 
992
            return dbus.String(u"")
 
993
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
 
994
    
 
995
    # Enabled - property
 
996
    @dbus_service_property(_interface, signature=u"b",
 
997
                           access=u"readwrite")
 
998
    def Enabled_dbus_property(self, value=None):
 
999
        if value is None:       # get
 
1000
            return dbus.Boolean(self.enabled)
 
1001
        if value:
 
1002
            self.enable()
 
1003
        else:
 
1004
            self.disable()
 
1005
    
 
1006
    # LastCheckedOK - property
 
1007
    @dbus_service_property(_interface, signature=u"s",
 
1008
                           access=u"readwrite")
 
1009
    def LastCheckedOK_dbus_property(self, value=None):
 
1010
        if value is not None:
 
1011
            self.checked_ok()
 
1012
            return
370
1013
        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.
 
1014
            return dbus.String(u"")
 
1015
        return dbus.String(self._datetime_to_dbus(self
 
1016
                                                  .last_checked_ok))
 
1017
    
 
1018
    # Timeout - property
 
1019
    @dbus_service_property(_interface, signature=u"t",
 
1020
                           access=u"readwrite")
 
1021
    def Timeout_dbus_property(self, value=None):
 
1022
        if value is None:       # get
 
1023
            return dbus.UInt64(self.timeout_milliseconds())
 
1024
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
1025
        # Emit D-Bus signal
 
1026
        self.PropertyChanged(dbus.String(u"Timeout"),
 
1027
                             dbus.UInt64(value, variant_level=1))
 
1028
        if getattr(self, u"disable_initiator_tag", None) is None:
 
1029
            return
 
1030
        # Reschedule timeout
 
1031
        gobject.source_remove(self.disable_initiator_tag)
 
1032
        self.disable_initiator_tag = None
 
1033
        time_to_die = (self.
 
1034
                       _timedelta_to_milliseconds((self
 
1035
                                                   .last_checked_ok
 
1036
                                                   + self.timeout)
 
1037
                                                  - datetime.datetime
 
1038
                                                  .utcnow()))
 
1039
        if time_to_die <= 0:
 
1040
            # The timeout has passed
 
1041
            self.disable()
 
1042
        else:
 
1043
            self.disable_initiator_tag = (gobject.timeout_add
 
1044
                                          (time_to_die, self.disable))
 
1045
    
 
1046
    # Interval - property
 
1047
    @dbus_service_property(_interface, signature=u"t",
 
1048
                           access=u"readwrite")
 
1049
    def Interval_dbus_property(self, value=None):
 
1050
        if value is None:       # get
 
1051
            return dbus.UInt64(self.interval_milliseconds())
 
1052
        self.interval = datetime.timedelta(0, 0, 0, value)
 
1053
        # Emit D-Bus signal
 
1054
        self.PropertyChanged(dbus.String(u"Interval"),
 
1055
                             dbus.UInt64(value, variant_level=1))
 
1056
        if getattr(self, u"checker_initiator_tag", None) is None:
 
1057
            return
 
1058
        # Reschedule checker run
 
1059
        gobject.source_remove(self.checker_initiator_tag)
 
1060
        self.checker_initiator_tag = (gobject.timeout_add
 
1061
                                      (value, self.start_checker))
 
1062
        self.start_checker()    # Start one now, too
 
1063
 
 
1064
    # Checker - property
 
1065
    @dbus_service_property(_interface, signature=u"s",
 
1066
                           access=u"readwrite")
 
1067
    def Checker_dbus_property(self, value=None):
 
1068
        if value is None:       # get
 
1069
            return dbus.String(self.checker_command)
 
1070
        self.checker_command = value
 
1071
        # Emit D-Bus signal
 
1072
        self.PropertyChanged(dbus.String(u"Checker"),
 
1073
                             dbus.String(self.checker_command,
 
1074
                                         variant_level=1))
 
1075
    
 
1076
    # CheckerRunning - property
 
1077
    @dbus_service_property(_interface, signature=u"b",
 
1078
                           access=u"readwrite")
 
1079
    def CheckerRunning_dbus_property(self, value=None):
 
1080
        if value is None:       # get
 
1081
            return dbus.Boolean(self.checker is not None)
 
1082
        if value:
 
1083
            self.start_checker()
 
1084
        else:
 
1085
            self.stop_checker()
 
1086
    
 
1087
    # ObjectPath - property
 
1088
    @dbus_service_property(_interface, signature=u"o", access=u"read")
 
1089
    def ObjectPath_dbus_property(self):
 
1090
        return self.dbus_object_path # is already a dbus.ObjectPath
 
1091
    
 
1092
    # Secret = property
 
1093
    @dbus_service_property(_interface, signature=u"ay",
 
1094
                           access=u"write", byte_arrays=True)
 
1095
    def Secret_dbus_property(self, value):
 
1096
        self.secret = str(value)
 
1097
    
 
1098
    del _interface
 
1099
 
 
1100
 
 
1101
class ProxyClient(object):
 
1102
    def __init__(self, child_pipe, fpr, address):
 
1103
        self._pipe = child_pipe
 
1104
        self._pipe.send(('init', fpr, address))
 
1105
        if not self._pipe.recv():
 
1106
            raise KeyError()
 
1107
 
 
1108
    def __getattribute__(self, name):
 
1109
        if(name == '_pipe'):
 
1110
            return super(ProxyClient, self).__getattribute__(name)
 
1111
        self._pipe.send(('getattr', name))
 
1112
        data = self._pipe.recv()
 
1113
        if data[0] == 'data':
 
1114
            return data[1]
 
1115
        if data[0] == 'function':
 
1116
            def func(*args, **kwargs):
 
1117
                self._pipe.send(('funcall', name, args, kwargs))
 
1118
                return self._pipe.recv()[1]
 
1119
            return func
 
1120
 
 
1121
    def __setattr__(self, name, value):
 
1122
        if(name == '_pipe'):
 
1123
            return super(ProxyClient, self).__setattr__(name, value)
 
1124
        self._pipe.send(('setattr', name, value))
 
1125
 
 
1126
 
 
1127
class ClientHandler(socketserver.BaseRequestHandler, object):
 
1128
    """A class to handle client connections.
 
1129
    
 
1130
    Instantiated once for each connection to handle it.
426
1131
    Note: This will run in its own forked process."""
427
1132
    
428
1133
    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.
 
1134
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
1135
            logger.info(u"TCP connection from: %s",
 
1136
                        unicode(self.client_address))
 
1137
            logger.debug(u"Pipe FD: %d",
 
1138
                         self.server.child_pipe.fileno())
 
1139
 
 
1140
            session = (gnutls.connection
 
1141
                       .ClientSession(self.request,
 
1142
                                      gnutls.connection
 
1143
                                      .X509Credentials()))
 
1144
 
 
1145
            # Note: gnutls.connection.X509Credentials is really a
 
1146
            # generic GnuTLS certificate credentials object so long as
 
1147
            # no X.509 keys are added to it.  Therefore, we can use it
 
1148
            # here despite using OpenPGP certificates.
 
1149
 
 
1150
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
 
1151
            #                      u"+AES-256-CBC", u"+SHA1",
 
1152
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
 
1153
            #                      u"+DHE-DSS"))
 
1154
            # Use a fallback default, since this MUST be set.
 
1155
            priority = self.server.gnutls_priority
 
1156
            if priority is None:
 
1157
                priority = u"NORMAL"
 
1158
            (gnutls.library.functions
 
1159
             .gnutls_priority_set_direct(session._c_object,
 
1160
                                         priority, None))
 
1161
 
 
1162
            # Start communication using the Mandos protocol
 
1163
            # Get protocol number
 
1164
            line = self.request.makefile().readline()
 
1165
            logger.debug(u"Protocol version: %r", line)
 
1166
            try:
 
1167
                if int(line.strip().split()[0]) > 1:
 
1168
                    raise RuntimeError
 
1169
            except (ValueError, IndexError, RuntimeError), error:
 
1170
                logger.error(u"Unknown protocol version: %s", error)
 
1171
                return
 
1172
 
 
1173
            # Start GnuTLS connection
 
1174
            try:
 
1175
                session.handshake()
 
1176
            except gnutls.errors.GNUTLSError, error:
 
1177
                logger.warning(u"Handshake failed: %s", error)
 
1178
                # Do not run session.bye() here: the session is not
 
1179
                # established.  Just abandon the request.
 
1180
                return
 
1181
            logger.debug(u"Handshake succeeded")
 
1182
 
 
1183
            approval_required = False
 
1184
            try:
 
1185
                try:
 
1186
                    fpr = self.fingerprint(self.peer_certificate
 
1187
                                           (session))
 
1188
                except (TypeError, gnutls.errors.GNUTLSError), error:
 
1189
                    logger.warning(u"Bad certificate: %s", error)
 
1190
                    return
 
1191
                logger.debug(u"Fingerprint: %s", fpr)
 
1192
 
 
1193
                try:
 
1194
                    client = ProxyClient(child_pipe, fpr,
 
1195
                                         self.client_address)
 
1196
                except KeyError:
 
1197
                    return
 
1198
                
 
1199
                if client.approval_delay:
 
1200
                    delay = client.approval_delay
 
1201
                    client.approvals_pending += 1
 
1202
                    approval_required = True
 
1203
                
 
1204
                while True:
 
1205
                    if not client.enabled:
 
1206
                        logger.warning(u"Client %s is disabled",
 
1207
                                       client.name)
 
1208
                        if self.server.use_dbus:
 
1209
                            # Emit D-Bus signal
 
1210
                            client.Rejected("Disabled")                    
 
1211
                        return
 
1212
                    
 
1213
                    if client._approved or not client.approval_delay:
 
1214
                        #We are approved or approval is disabled
 
1215
                        break
 
1216
                    elif client._approved is None:
 
1217
                        logger.info(u"Client %s needs approval",
 
1218
                                    client.name)
 
1219
                        if self.server.use_dbus:
 
1220
                            # Emit D-Bus signal
 
1221
                            client.NeedApproval(
 
1222
                                client.approval_delay_milliseconds(),
 
1223
                                client.approved_by_default)
 
1224
                    else:
 
1225
                        logger.warning(u"Client %s was not approved",
 
1226
                                       client.name)
 
1227
                        if self.server.use_dbus:
 
1228
                            # Emit D-Bus signal
 
1229
                            client.Rejected("Denied")
 
1230
                        return
 
1231
                    
 
1232
                    #wait until timeout or approved
 
1233
                    #x = float(client._timedelta_to_milliseconds(delay))
 
1234
                    time = datetime.datetime.now()
 
1235
                    client.changedstate.acquire()
 
1236
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
 
1237
                    client.changedstate.release()
 
1238
                    time2 = datetime.datetime.now()
 
1239
                    if (time2 - time) >= delay:
 
1240
                        if not client.approved_by_default:
 
1241
                            logger.warning("Client %s timed out while"
 
1242
                                           " waiting for approval",
 
1243
                                           client.name)
 
1244
                            if self.server.use_dbus:
 
1245
                                # Emit D-Bus signal
 
1246
                                client.Rejected("Timed out")
 
1247
                            return
 
1248
                        else:
 
1249
                            break
 
1250
                    else:
 
1251
                        delay -= time2 - time
 
1252
                
 
1253
                sent_size = 0
 
1254
                while sent_size < len(client.secret):
 
1255
                    try:
 
1256
                        sent = session.send(client.secret[sent_size:])
 
1257
                    except (gnutls.errors.GNUTLSError), error:
 
1258
                        logger.warning("gnutls send failed")
 
1259
                        return
 
1260
                    logger.debug(u"Sent: %d, remaining: %d",
 
1261
                                 sent, len(client.secret)
 
1262
                                 - (sent_size + sent))
 
1263
                    sent_size += sent
 
1264
 
 
1265
                logger.info(u"Sending secret to %s", client.name)
 
1266
                # bump the timeout as if seen
 
1267
                client.checked_ok()
 
1268
                if self.server.use_dbus:
 
1269
                    # Emit D-Bus signal
 
1270
                    client.GotSecret()
 
1271
            
 
1272
            finally:
 
1273
                if approval_required:
 
1274
                    client.approvals_pending -= 1
 
1275
                try:
 
1276
                    session.bye()
 
1277
                except (gnutls.errors.GNUTLSError), error:
 
1278
                    logger.warning("GnuTLS bye failed")
 
1279
    
 
1280
    @staticmethod
 
1281
    def peer_certificate(session):
 
1282
        "Return the peer's OpenPGP certificate as a bytestring"
 
1283
        # If not an OpenPGP certificate...
 
1284
        if (gnutls.library.functions
 
1285
            .gnutls_certificate_type_get(session._c_object)
 
1286
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
1287
            # ...do the normal thing
 
1288
            return session.peer_certificate
 
1289
        list_size = ctypes.c_uint(1)
 
1290
        cert_list = (gnutls.library.functions
 
1291
                     .gnutls_certificate_get_peers
 
1292
                     (session._c_object, ctypes.byref(list_size)))
 
1293
        if not bool(cert_list) and list_size.value != 0:
 
1294
            raise gnutls.errors.GNUTLSError(u"error getting peer"
 
1295
                                            u" certificate")
 
1296
        if list_size.value == 0:
 
1297
            return None
 
1298
        cert = cert_list[0]
 
1299
        return ctypes.string_at(cert.data, cert.size)
 
1300
    
 
1301
    @staticmethod
 
1302
    def fingerprint(openpgp):
 
1303
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
1304
        # New GnuTLS "datum" with the OpenPGP public key
 
1305
        datum = (gnutls.library.types
 
1306
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
1307
                                             ctypes.POINTER
 
1308
                                             (ctypes.c_ubyte)),
 
1309
                                 ctypes.c_uint(len(openpgp))))
 
1310
        # New empty GnuTLS certificate
 
1311
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
1312
        (gnutls.library.functions
 
1313
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
1314
        # Import the OpenPGP public key into the certificate
 
1315
        (gnutls.library.functions
 
1316
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
1317
                                    gnutls.library.constants
 
1318
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
1319
        # Verify the self signature in the key
 
1320
        crtverify = ctypes.c_uint()
 
1321
        (gnutls.library.functions
 
1322
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
1323
                                         ctypes.byref(crtverify)))
 
1324
        if crtverify.value != 0:
 
1325
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1326
            raise (gnutls.errors.CertificateSecurityError
 
1327
                   (u"Verify failed"))
 
1328
        # New buffer for the fingerprint
 
1329
        buf = ctypes.create_string_buffer(20)
 
1330
        buf_len = ctypes.c_size_t()
 
1331
        # Get the fingerprint from the certificate into the buffer
 
1332
        (gnutls.library.functions
 
1333
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
1334
                                             ctypes.byref(buf_len)))
 
1335
        # Deinit the certificate
 
1336
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1337
        # Convert the buffer to a Python bytestring
 
1338
        fpr = ctypes.string_at(buf, buf_len.value)
 
1339
        # Convert the bytestring to hexadecimal notation
 
1340
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
1341
        return hex_fpr
 
1342
 
 
1343
 
 
1344
class MultiprocessingMixIn(object):
 
1345
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
1346
    def sub_process_main(self, request, address):
 
1347
        try:
 
1348
            self.finish_request(request, address)
 
1349
        except:
 
1350
            self.handle_error(request, address)
 
1351
        self.close_request(request)
 
1352
            
 
1353
    def process_request(self, request, address):
 
1354
        """Start a new process to process the request."""
 
1355
        multiprocessing.Process(target = self.sub_process_main,
 
1356
                                args = (request, address)).start()
 
1357
 
 
1358
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
1359
    """ adds a pipe to the MixIn """
 
1360
    def process_request(self, request, client_address):
 
1361
        """Overrides and wraps the original process_request().
 
1362
        
 
1363
        This function creates a new pipe in self.pipe
 
1364
        """
 
1365
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
1366
 
 
1367
        super(MultiprocessingMixInWithPipe,
 
1368
              self).process_request(request, client_address)
 
1369
        self.child_pipe.close()
 
1370
        self.add_pipe(parent_pipe)
 
1371
 
 
1372
    def add_pipe(self, parent_pipe):
 
1373
        """Dummy function; override as necessary"""
 
1374
        pass
 
1375
 
 
1376
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
1377
                     socketserver.TCPServer, object):
 
1378
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
1379
    
502
1380
    Attributes:
503
 
        settings:       Server settings
504
 
        clients:        Set() of Client objects
 
1381
        enabled:        Boolean; whether this server is activated yet
 
1382
        interface:      None or a network interface name (string)
 
1383
        use_ipv6:       Boolean; to use IPv6 or not
505
1384
    """
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)
 
1385
    def __init__(self, server_address, RequestHandlerClass,
 
1386
                 interface=None, use_ipv6=True):
 
1387
        self.interface = interface
 
1388
        if use_ipv6:
 
1389
            self.address_family = socket.AF_INET6
 
1390
        socketserver.TCPServer.__init__(self, server_address,
 
1391
                                        RequestHandlerClass)
515
1392
    def server_bind(self):
516
1393
        """This overrides the normal server_bind() function
517
1394
        to bind to an interface if one was specified, and also NOT to
518
1395
        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
 
1396
        if self.interface is not None:
 
1397
            if SO_BINDTODEVICE is None:
 
1398
                logger.error(u"SO_BINDTODEVICE does not exist;"
 
1399
                             u" cannot bind to interface %s",
 
1400
                             self.interface)
 
1401
            else:
 
1402
                try:
 
1403
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
1404
                                           SO_BINDTODEVICE,
 
1405
                                           str(self.interface
 
1406
                                               + u'\0'))
 
1407
                except socket.error, error:
 
1408
                    if error[0] == errno.EPERM:
 
1409
                        logger.error(u"No permission to"
 
1410
                                     u" bind to interface %s",
 
1411
                                     self.interface)
 
1412
                    elif error[0] == errno.ENOPROTOOPT:
 
1413
                        logger.error(u"SO_BINDTODEVICE not available;"
 
1414
                                     u" cannot bind to interface %s",
 
1415
                                     self.interface)
 
1416
                    else:
 
1417
                        raise
533
1418
        # Only bind(2) the socket if we really need to.
534
1419
        if self.server_address[0] or self.server_address[1]:
535
1420
            if not self.server_address[0]:
536
 
                in6addr_any = "::"
537
 
                self.server_address = (in6addr_any,
 
1421
                if self.address_family == socket.AF_INET6:
 
1422
                    any_address = u"::" # in6addr_any
 
1423
                else:
 
1424
                    any_address = socket.INADDR_ANY
 
1425
                self.server_address = (any_address,
538
1426
                                       self.server_address[1])
539
1427
            elif not self.server_address[1]:
540
1428
                self.server_address = (self.server_address[0],
541
1429
                                       0)
542
 
#                 if self.settings["interface"]:
 
1430
#                 if self.interface:
543
1431
#                     self.server_address = (self.server_address[0],
544
1432
#                                            0, # port
545
1433
#                                            0, # flowinfo
546
1434
#                                            if_nametoindex
547
 
#                                            (self.settings
548
 
#                                             ["interface"]))
549
 
            return super(type(self), self).server_bind()
 
1435
#                                            (self.interface))
 
1436
            return socketserver.TCPServer.server_bind(self)
 
1437
 
 
1438
 
 
1439
class MandosServer(IPv6_TCPServer):
 
1440
    """Mandos server.
 
1441
    
 
1442
    Attributes:
 
1443
        clients:        set of Client objects
 
1444
        gnutls_priority GnuTLS priority string
 
1445
        use_dbus:       Boolean; to emit D-Bus signals or not
 
1446
    
 
1447
    Assumes a gobject.MainLoop event loop.
 
1448
    """
 
1449
    def __init__(self, server_address, RequestHandlerClass,
 
1450
                 interface=None, use_ipv6=True, clients=None,
 
1451
                 gnutls_priority=None, use_dbus=True):
 
1452
        self.enabled = False
 
1453
        self.clients = clients
 
1454
        if self.clients is None:
 
1455
            self.clients = set()
 
1456
        self.use_dbus = use_dbus
 
1457
        self.gnutls_priority = gnutls_priority
 
1458
        IPv6_TCPServer.__init__(self, server_address,
 
1459
                                RequestHandlerClass,
 
1460
                                interface = interface,
 
1461
                                use_ipv6 = use_ipv6)
 
1462
    def server_activate(self):
 
1463
        if self.enabled:
 
1464
            return socketserver.TCPServer.server_activate(self)
 
1465
    def enable(self):
 
1466
        self.enabled = True
 
1467
    def add_pipe(self, parent_pipe):
 
1468
        # Call "handle_ipc" for both data and EOF events
 
1469
        gobject.io_add_watch(parent_pipe.fileno(),
 
1470
                             gobject.IO_IN | gobject.IO_HUP,
 
1471
                             functools.partial(self.handle_ipc,
 
1472
                                               parent_pipe = parent_pipe))
 
1473
        
 
1474
    def handle_ipc(self, source, condition, parent_pipe=None,
 
1475
                   client_object=None):
 
1476
        condition_names = {
 
1477
            gobject.IO_IN: u"IN",   # There is data to read.
 
1478
            gobject.IO_OUT: u"OUT", # Data can be written (without
 
1479
                                    # blocking).
 
1480
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
 
1481
            gobject.IO_ERR: u"ERR", # Error condition.
 
1482
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
 
1483
                                    # broken, usually for pipes and
 
1484
                                    # sockets).
 
1485
            }
 
1486
        conditions_string = ' | '.join(name
 
1487
                                       for cond, name in
 
1488
                                       condition_names.iteritems()
 
1489
                                       if cond & condition)
 
1490
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
 
1491
                     conditions_string)
 
1492
 
 
1493
        # error or the other end of multiprocessing.Pipe has closed
 
1494
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
 
1495
            return False
 
1496
        
 
1497
        # Read a request from the child
 
1498
        request = parent_pipe.recv()
 
1499
        logger.debug(u"IPC request: %s", repr(request))
 
1500
        command = request[0]
 
1501
        
 
1502
        if command == 'init':
 
1503
            fpr = request[1]
 
1504
            address = request[2]
 
1505
            
 
1506
            for c in self.clients:
 
1507
                if c.fingerprint == fpr:
 
1508
                    client = c
 
1509
                    break
 
1510
            else:
 
1511
                logger.warning(u"Client not found for fingerprint: %s, ad"
 
1512
                               u"dress: %s", fpr, address)
 
1513
                if self.use_dbus:
 
1514
                    # Emit D-Bus signal
 
1515
                    mandos_dbus_service.ClientNotFound(fpr, address)
 
1516
                parent_pipe.send(False)
 
1517
                return False
 
1518
            
 
1519
            gobject.io_add_watch(parent_pipe.fileno(),
 
1520
                                 gobject.IO_IN | gobject.IO_HUP,
 
1521
                                 functools.partial(self.handle_ipc,
 
1522
                                                   parent_pipe = parent_pipe,
 
1523
                                                   client_object = client))
 
1524
            parent_pipe.send(True)
 
1525
            # remove the old hook in favor of the new above hook on same fileno
 
1526
            return False
 
1527
        if command == 'funcall':
 
1528
            funcname = request[1]
 
1529
            args = request[2]
 
1530
            kwargs = request[3]
 
1531
            
 
1532
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
 
1533
 
 
1534
        if command == 'getattr':
 
1535
            attrname = request[1]
 
1536
            if callable(client_object.__getattribute__(attrname)):
 
1537
                parent_pipe.send(('function',))
 
1538
            else:
 
1539
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
 
1540
        
 
1541
        if command == 'setattr':
 
1542
            attrname = request[1]
 
1543
            value = request[2]
 
1544
            setattr(client_object, attrname, value)
 
1545
 
 
1546
        return True
550
1547
 
551
1548
 
552
1549
def string_to_delta(interval):
553
1550
    """Parse a string and return a datetime.timedelta
554
 
 
555
 
    >>> string_to_delta('7d')
 
1551
    
 
1552
    >>> string_to_delta(u'7d')
556
1553
    datetime.timedelta(7)
557
 
    >>> string_to_delta('60s')
 
1554
    >>> string_to_delta(u'60s')
558
1555
    datetime.timedelta(0, 60)
559
 
    >>> string_to_delta('60m')
 
1556
    >>> string_to_delta(u'60m')
560
1557
    datetime.timedelta(0, 3600)
561
 
    >>> string_to_delta('24h')
 
1558
    >>> string_to_delta(u'24h')
562
1559
    datetime.timedelta(1)
563
1560
    >>> string_to_delta(u'1w')
564
1561
    datetime.timedelta(7)
 
1562
    >>> string_to_delta(u'5m 30s')
 
1563
    datetime.timedelta(0, 330)
565
1564
    """
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))
 
1565
    timevalue = datetime.timedelta(0)
 
1566
    for s in interval.split():
 
1567
        try:
 
1568
            suffix = unicode(s[-1])
 
1569
            value = int(s[:-1])
 
1570
            if suffix == u"d":
 
1571
                delta = datetime.timedelta(value)
 
1572
            elif suffix == u"s":
 
1573
                delta = datetime.timedelta(0, value)
 
1574
            elif suffix == u"m":
 
1575
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
1576
            elif suffix == u"h":
 
1577
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
1578
            elif suffix == u"w":
 
1579
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
1580
            else:
 
1581
                raise ValueError(u"Unknown suffix %r" % suffix)
 
1582
        except (ValueError, IndexError), e:
 
1583
            raise ValueError(e.message)
 
1584
        timevalue += delta
 
1585
    return timevalue
 
1586
 
608
1587
 
609
1588
def if_nametoindex(interface):
610
 
    """Call the C function if_nametoindex(), or equivalent"""
 
1589
    """Call the C function if_nametoindex(), or equivalent
 
1590
    
 
1591
    Note: This function cannot accept a unicode string."""
611
1592
    global if_nametoindex
612
1593
    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
 
1594
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1595
                          (ctypes.util.find_library(u"c"))
 
1596
                          .if_nametoindex)
617
1597
    except (OSError, AttributeError):
618
 
        if "struct" not in sys.modules:
619
 
            import struct
620
 
        if "fcntl" not in sys.modules:
621
 
            import fcntl
 
1598
        logger.warning(u"Doing if_nametoindex the hard way")
622
1599
        def if_nametoindex(interface):
623
1600
            "Get an interface index the hard way, i.e. using fcntl()"
624
1601
            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]
 
1602
            with contextlib.closing(socket.socket()) as s:
 
1603
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1604
                                    struct.pack(str(u"16s16x"),
 
1605
                                                interface))
 
1606
            interface_index = struct.unpack(str(u"I"),
 
1607
                                            ifreq[16:20])[0]
630
1608
            return interface_index
631
1609
    return if_nametoindex(interface)
632
1610
 
633
1611
 
634
1612
def daemon(nochdir = False, noclose = False):
635
1613
    """See daemon(3).  Standard BSD Unix function.
 
1614
    
636
1615
    This should really exist as os.daemon, but it doesn't (yet)."""
637
1616
    if os.fork():
638
1617
        sys.exit()
639
1618
    os.setsid()
640
1619
    if not nochdir:
641
 
        os.chdir("/")
 
1620
        os.chdir(u"/")
642
1621
    if os.fork():
643
1622
        sys.exit()
644
1623
    if not noclose:
646
1625
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
647
1626
        if not stat.S_ISCHR(os.fstat(null).st_mode):
648
1627
            raise OSError(errno.ENODEV,
649
 
                          "/dev/null not a character device")
 
1628
                          u"%s not a character device"
 
1629
                          % os.path.devnull)
650
1630
        os.dup2(null, sys.stdin.fileno())
651
1631
        os.dup2(null, sys.stdout.fileno())
652
1632
        os.dup2(null, sys.stderr.fileno())
655
1635
 
656
1636
 
657
1637
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()
 
1638
    
 
1639
    ##################################################################
 
1640
    # Parsing of options, both command line and config file
 
1641
    
 
1642
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
1643
    parser.add_option("-i", u"--interface", type=u"string",
 
1644
                      metavar="IF", help=u"Bind to interface IF")
 
1645
    parser.add_option("-a", u"--address", type=u"string",
 
1646
                      help=u"Address to listen for requests on")
 
1647
    parser.add_option("-p", u"--port", type=u"int",
 
1648
                      help=u"Port number to receive requests on")
 
1649
    parser.add_option("--check", action=u"store_true",
 
1650
                      help=u"Run self-test")
 
1651
    parser.add_option("--debug", action=u"store_true",
 
1652
                      help=u"Debug mode; run in foreground and log to"
 
1653
                      u" terminal")
 
1654
    parser.add_option("--debuglevel", type=u"string", metavar="Level",
 
1655
                      help=u"Debug level for stdout output")
 
1656
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
 
1657
                      u" priority string (see GnuTLS documentation)")
 
1658
    parser.add_option("--servicename", type=u"string",
 
1659
                      metavar=u"NAME", help=u"Zeroconf service name")
 
1660
    parser.add_option("--configdir", type=u"string",
 
1661
                      default=u"/etc/mandos", metavar=u"DIR",
 
1662
                      help=u"Directory to search for configuration"
 
1663
                      u" files")
 
1664
    parser.add_option("--no-dbus", action=u"store_false",
 
1665
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
 
1666
                      u" system bus interface")
 
1667
    parser.add_option("--no-ipv6", action=u"store_false",
 
1668
                      dest=u"use_ipv6", help=u"Do not use IPv6")
 
1669
    options = parser.parse_args()[0]
682
1670
    
683
1671
    if options.check:
684
1672
        import doctest
686
1674
        sys.exit()
687
1675
    
688
1676
    # Default values for config file for server-global settings
689
 
    server_defaults = { "interface": "",
690
 
                        "address": "",
691
 
                        "port": "",
692
 
                        "debug": "False",
693
 
                        "priority":
694
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
695
 
                        "servicename": "Mandos",
 
1677
    server_defaults = { u"interface": u"",
 
1678
                        u"address": u"",
 
1679
                        u"port": u"",
 
1680
                        u"debug": u"False",
 
1681
                        u"priority":
 
1682
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
1683
                        u"servicename": u"Mandos",
 
1684
                        u"use_dbus": u"True",
 
1685
                        u"use_ipv6": u"True",
 
1686
                        u"debuglevel": u"",
696
1687
                        }
697
1688
    
698
1689
    # Parse config file for server-global settings
699
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
1690
    server_config = configparser.SafeConfigParser(server_defaults)
700
1691
    del server_defaults
701
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
 
    server_section = "server"
 
1692
    server_config.read(os.path.join(options.configdir,
 
1693
                                    u"mandos.conf"))
703
1694
    # 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")
 
1695
    server_settings = server_config.defaults()
 
1696
    # Use the appropriate methods on the non-string config options
 
1697
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
 
1698
        server_settings[option] = server_config.getboolean(u"DEFAULT",
 
1699
                                                           option)
 
1700
    if server_settings["port"]:
 
1701
        server_settings["port"] = server_config.getint(u"DEFAULT",
 
1702
                                                       u"port")
708
1703
    del server_config
709
1704
    
710
1705
    # Override the settings from the config file with command line
711
1706
    # options, if set.
712
 
    for option in ("interface", "address", "port", "debug",
713
 
                   "priority", "servicename", "configdir"):
 
1707
    for option in (u"interface", u"address", u"port", u"debug",
 
1708
                   u"priority", u"servicename", u"configdir",
 
1709
                   u"use_dbus", u"use_ipv6", u"debuglevel"):
714
1710
        value = getattr(options, option)
715
1711
        if value is not None:
716
1712
            server_settings[option] = value
717
1713
    del options
 
1714
    # Force all strings to be unicode
 
1715
    for option in server_settings.keys():
 
1716
        if type(server_settings[option]) is str:
 
1717
            server_settings[option] = unicode(server_settings[option])
718
1718
    # Now we have our good server settings in "server_settings"
719
1719
    
720
 
    debug = server_settings["debug"]
721
 
    
722
 
    if not debug:
 
1720
    ##################################################################
 
1721
    
 
1722
    # For convenience
 
1723
    debug = server_settings[u"debug"]
 
1724
    debuglevel = server_settings[u"debuglevel"]
 
1725
    use_dbus = server_settings[u"use_dbus"]
 
1726
    use_ipv6 = server_settings[u"use_ipv6"]
 
1727
 
 
1728
    if server_settings[u"servicename"] != u"Mandos":
 
1729
        syslogger.setFormatter(logging.Formatter
 
1730
                               (u'Mandos (%s) [%%(process)d]:'
 
1731
                                u' %%(levelname)s: %%(message)s'
 
1732
                                % server_settings[u"servicename"]))
 
1733
    
 
1734
    # Parse config file with clients
 
1735
    client_defaults = { u"timeout": u"1h",
 
1736
                        u"interval": u"5m",
 
1737
                        u"checker": u"fping -q -- %%(host)s",
 
1738
                        u"host": u"",
 
1739
                        u"approval_delay": u"0s",
 
1740
                        u"approval_duration": u"1s",
 
1741
                        }
 
1742
    client_config = configparser.SafeConfigParser(client_defaults)
 
1743
    client_config.read(os.path.join(server_settings[u"configdir"],
 
1744
                                    u"clients.conf"))
 
1745
    
 
1746
    global mandos_dbus_service
 
1747
    mandos_dbus_service = None
 
1748
    
 
1749
    tcp_server = MandosServer((server_settings[u"address"],
 
1750
                               server_settings[u"port"]),
 
1751
                              ClientHandler,
 
1752
                              interface=(server_settings[u"interface"]
 
1753
                                         or None),
 
1754
                              use_ipv6=use_ipv6,
 
1755
                              gnutls_priority=
 
1756
                              server_settings[u"priority"],
 
1757
                              use_dbus=use_dbus)
 
1758
    pidfilename = u"/var/run/mandos.pid"
 
1759
    try:
 
1760
        pidfile = open(pidfilename, u"w")
 
1761
    except IOError:
 
1762
        logger.error(u"Could not open file %r", pidfilename)
 
1763
    
 
1764
    try:
 
1765
        uid = pwd.getpwnam(u"_mandos").pw_uid
 
1766
        gid = pwd.getpwnam(u"_mandos").pw_gid
 
1767
    except KeyError:
 
1768
        try:
 
1769
            uid = pwd.getpwnam(u"mandos").pw_uid
 
1770
            gid = pwd.getpwnam(u"mandos").pw_gid
 
1771
        except KeyError:
 
1772
            try:
 
1773
                uid = pwd.getpwnam(u"nobody").pw_uid
 
1774
                gid = pwd.getpwnam(u"nobody").pw_gid
 
1775
            except KeyError:
 
1776
                uid = 65534
 
1777
                gid = 65534
 
1778
    try:
 
1779
        os.setgid(gid)
 
1780
        os.setuid(uid)
 
1781
    except OSError, error:
 
1782
        if error[0] != errno.EPERM:
 
1783
            raise error
 
1784
    
 
1785
    if not debug and not debuglevel:
723
1786
        syslogger.setLevel(logging.WARNING)
724
1787
        console.setLevel(logging.WARNING)
725
 
    
726
 
    if server_settings["servicename"] != "Mandos":
727
 
        syslogger.setFormatter(logging.Formatter\
728
 
                               ('Mandos (%s): %%(levelname)s:'
729
 
                                ' %%(message)s'
730
 
                                % server_settings["servicename"]))
731
 
    
732
 
    # Parse config file with clients
733
 
    client_defaults = { "timeout": "1h",
734
 
                        "interval": "5m",
735
 
                        "checker": "fping -q -- %%(host)s",
736
 
                        }
737
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
738
 
    client_config.read(os.path.join(server_settings["configdir"],
739
 
                                    "clients.conf"))
740
 
    
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"])
 
1788
    if debuglevel:
 
1789
        level = getattr(logging, debuglevel.upper())
 
1790
        syslogger.setLevel(level)
 
1791
        console.setLevel(level)
 
1792
 
 
1793
    if debug:
 
1794
        # Enable all possible GnuTLS debugging
 
1795
        
 
1796
        # "Use a log level over 10 to enable all debugging options."
 
1797
        # - GnuTLS manual
 
1798
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1799
        
 
1800
        @gnutls.library.types.gnutls_log_func
 
1801
        def debug_gnutls(level, string):
 
1802
            logger.debug(u"GnuTLS: %s", string[:-1])
 
1803
        
 
1804
        (gnutls.library.functions
 
1805
         .gnutls_global_set_log_function(debug_gnutls))
 
1806
        
 
1807
        # Redirect stdin so all checkers get /dev/null
 
1808
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1809
        os.dup2(null, sys.stdin.fileno())
 
1810
        if null > 2:
 
1811
            os.close(null)
 
1812
    else:
 
1813
        # No console logging
 
1814
        logger.removeHandler(console)
 
1815
    
746
1816
    
747
1817
    global main_loop
748
 
    global bus
749
 
    global server
750
1818
    # From the Avahi example code
751
1819
    DBusGMainLoop(set_as_default=True )
752
1820
    main_loop = gobject.MainLoop()
753
1821
    bus = dbus.SystemBus()
754
 
    server = dbus.Interface(
755
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
 
            avahi.DBUS_INTERFACE_SERVER )
757
1822
    # 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
 
    
 
1823
    if use_dbus:
 
1824
        try:
 
1825
            bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
 
1826
                                            bus, do_not_queue=True)
 
1827
        except dbus.exceptions.NameExistsException, e:
 
1828
            logger.error(unicode(e) + u", disabling D-Bus")
 
1829
            use_dbus = False
 
1830
            server_settings[u"use_dbus"] = False
 
1831
            tcp_server.use_dbus = False
 
1832
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1833
    service = AvahiService(name = server_settings[u"servicename"],
 
1834
                           servicetype = u"_mandos._tcp",
 
1835
                           protocol = protocol, bus = bus)
 
1836
    if server_settings["interface"]:
 
1837
        service.interface = (if_nametoindex
 
1838
                             (str(server_settings[u"interface"])))
 
1839
 
775
1840
    if not debug:
776
 
        logger.removeHandler(console)
 
1841
        # Close all input and output, do double fork, etc.
777
1842
        daemon()
778
 
    
779
 
    pidfilename = "/var/run/mandos/mandos.pid"
780
 
    pid = os.getpid()
 
1843
        
 
1844
    global multiprocessing_manager
 
1845
    multiprocessing_manager = multiprocessing.Manager()
 
1846
    
 
1847
    client_class = Client
 
1848
    if use_dbus:
 
1849
        client_class = functools.partial(ClientDBus, bus = bus)
 
1850
    def client_config_items(config, section):
 
1851
        special_settings = {
 
1852
            "approved_by_default":
 
1853
                lambda: config.getboolean(section,
 
1854
                                          "approved_by_default"),
 
1855
            }
 
1856
        for name, value in config.items(section):
 
1857
            try:
 
1858
                yield (name, special_settings[name]())
 
1859
            except KeyError:
 
1860
                yield (name, value)
 
1861
    
 
1862
    tcp_server.clients.update(set(
 
1863
            client_class(name = section,
 
1864
                         config= dict(client_config_items(
 
1865
                        client_config, section)))
 
1866
            for section in client_config.sections()))
 
1867
    if not tcp_server.clients:
 
1868
        logger.warning(u"No clients defined")
 
1869
        
781
1870
    try:
782
 
        pidfile = open(pidfilename, "w")
783
 
        pidfile.write(str(pid) + "\n")
784
 
        pidfile.close()
 
1871
        with pidfile:
 
1872
            pid = os.getpid()
 
1873
            pidfile.write(str(pid) + "\n")
785
1874
        del pidfile
786
 
    except IOError, err:
787
 
        logger.error(u"Could not write %s file with PID %d",
788
 
                     pidfilename, os.getpid())
 
1875
    except IOError:
 
1876
        logger.error(u"Could not write to file %r with PID %d",
 
1877
                     pidfilename, pid)
 
1878
    except NameError:
 
1879
        # "pidfile" was never created
 
1880
        pass
 
1881
    del pidfilename
 
1882
    
 
1883
    if not debug:
 
1884
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1885
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1886
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1887
    
 
1888
    if use_dbus:
 
1889
        class MandosDBusService(dbus.service.Object):
 
1890
            """A D-Bus proxy object"""
 
1891
            def __init__(self):
 
1892
                dbus.service.Object.__init__(self, bus, u"/")
 
1893
            _interface = u"se.bsnet.fukt.Mandos"
 
1894
            
 
1895
            @dbus.service.signal(_interface, signature=u"o")
 
1896
            def ClientAdded(self, objpath):
 
1897
                "D-Bus signal"
 
1898
                pass
 
1899
            
 
1900
            @dbus.service.signal(_interface, signature=u"ss")
 
1901
            def ClientNotFound(self, fingerprint, address):
 
1902
                "D-Bus signal"
 
1903
                pass
 
1904
            
 
1905
            @dbus.service.signal(_interface, signature=u"os")
 
1906
            def ClientRemoved(self, objpath, name):
 
1907
                "D-Bus signal"
 
1908
                pass
 
1909
            
 
1910
            @dbus.service.method(_interface, out_signature=u"ao")
 
1911
            def GetAllClients(self):
 
1912
                "D-Bus method"
 
1913
                return dbus.Array(c.dbus_object_path
 
1914
                                  for c in tcp_server.clients)
 
1915
            
 
1916
            @dbus.service.method(_interface,
 
1917
                                 out_signature=u"a{oa{sv}}")
 
1918
            def GetAllClientsWithProperties(self):
 
1919
                "D-Bus method"
 
1920
                return dbus.Dictionary(
 
1921
                    ((c.dbus_object_path, c.GetAll(u""))
 
1922
                     for c in tcp_server.clients),
 
1923
                    signature=u"oa{sv}")
 
1924
            
 
1925
            @dbus.service.method(_interface, in_signature=u"o")
 
1926
            def RemoveClient(self, object_path):
 
1927
                "D-Bus method"
 
1928
                for c in tcp_server.clients:
 
1929
                    if c.dbus_object_path == object_path:
 
1930
                        tcp_server.clients.remove(c)
 
1931
                        c.remove_from_connection()
 
1932
                        # Don't signal anything except ClientRemoved
 
1933
                        c.disable(quiet=True)
 
1934
                        # Emit D-Bus signal
 
1935
                        self.ClientRemoved(object_path, c.name)
 
1936
                        return
 
1937
                raise KeyError(object_path)
 
1938
            
 
1939
            del _interface
 
1940
        
 
1941
        mandos_dbus_service = MandosDBusService()
789
1942
    
790
1943
    def cleanup():
791
1944
        "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
 
1945
        service.cleanup()
798
1946
        
799
 
        while clients:
800
 
            client = clients.pop()
801
 
            client.stop_hook = None
802
 
            client.stop()
 
1947
        while tcp_server.clients:
 
1948
            client = tcp_server.clients.pop()
 
1949
            if use_dbus:
 
1950
                client.remove_from_connection()
 
1951
            client.disable_hook = None
 
1952
            # Don't signal anything except ClientRemoved
 
1953
            client.disable(quiet=True)
 
1954
            if use_dbus:
 
1955
                # Emit D-Bus signal
 
1956
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
 
1957
                                                  client.name)
803
1958
    
804
1959
    atexit.register(cleanup)
805
1960
    
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)
 
1961
    for client in tcp_server.clients:
 
1962
        if use_dbus:
 
1963
            # Emit D-Bus signal
 
1964
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
 
1965
        client.enable()
 
1966
    
 
1967
    tcp_server.enable()
 
1968
    tcp_server.server_activate()
 
1969
    
819
1970
    # Find out what port we got
820
1971
    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())
 
1972
    if use_ipv6:
 
1973
        logger.info(u"Now listening on address %r, port %d,"
 
1974
                    " flowinfo %d, scope_id %d"
 
1975
                    % tcp_server.socket.getsockname())
 
1976
    else:                       # IPv4
 
1977
        logger.info(u"Now listening on address %r, port %d"
 
1978
                    % tcp_server.socket.getsockname())
823
1979
    
824
1980
    #service.interface = tcp_server.socket.getsockname()[3]
825
1981
    
826
1982
    try:
827
1983
        # From the Avahi example code
828
 
        server.connect_to_signal("StateChanged", server_state_changed)
829
1984
        try:
830
 
            server_state_changed(server.GetState())
 
1985
            service.activate()
831
1986
        except dbus.exceptions.DBusException, error:
832
1987
            logger.critical(u"DBusException: %s", error)
 
1988
            cleanup()
833
1989
            sys.exit(1)
834
1990
        # End of Avahi example code
835
1991
        
836
1992
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
1993
                             lambda *args, **kwargs:
838
 
                             tcp_server.handle_request\
839
 
                             (*args[2:], **kwargs) or True)
 
1994
                             (tcp_server.handle_request
 
1995
                              (*args[2:], **kwargs) or True))
840
1996
        
841
1997
        logger.debug(u"Starting main loop")
842
 
        main_loop_started = True
843
1998
        main_loop.run()
844
1999
    except AvahiError, error:
845
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
2000
        logger.critical(u"AvahiError: %s", error)
 
2001
        cleanup()
846
2002
        sys.exit(1)
847
2003
    except KeyboardInterrupt:
848
2004
        if debug:
849
 
            print
 
2005
            print >> sys.stderr
 
2006
        logger.debug(u"Server received KeyboardInterrupt")
 
2007
    logger.debug(u"Server exiting")
 
2008
    # Must run before the D-Bus bus name gets deregistered
 
2009
    cleanup()
850
2010
 
851
2011
if __name__ == '__main__':
852
2012
    main()