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mandos
6
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# 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 © 2008-2011 Teddy Hogeborn
 
15
# Copyright © 2008-2011 Björn Påhlsson
15
16
# 
16
17
# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
27
28
# along with this program.  If not, see
28
29
# <http://www.gnu.org/licenses/>.
29
30
# 
30
 
# Contact the authors at <mandos@fukt.bsnet.se>.
 
31
# Contact the authors at <mandos@recompile.se>.
31
32
# 
32
33
 
33
 
from __future__ import division
 
34
from __future__ import (division, absolute_import, print_function,
 
35
                        unicode_literals)
34
36
 
35
 
import SocketServer
 
37
import SocketServer as socketserver
36
38
import socket
37
 
import select
38
 
from optparse import OptionParser
 
39
import argparse
39
40
import datetime
40
41
import errno
41
42
import gnutls.crypto
44
45
import gnutls.library.functions
45
46
import gnutls.library.constants
46
47
import gnutls.library.types
47
 
import ConfigParser
 
48
import ConfigParser as configparser
48
49
import sys
49
50
import re
50
51
import os
51
52
import signal
52
 
from sets import Set
53
53
import subprocess
54
54
import atexit
55
55
import stat
56
56
import logging
57
57
import logging.handlers
58
58
import pwd
 
59
import contextlib
 
60
import struct
 
61
import fcntl
 
62
import functools
 
63
import cPickle as pickle
 
64
import multiprocessing
 
65
import types
59
66
 
60
67
import dbus
 
68
import dbus.service
61
69
import gobject
62
70
import avahi
63
71
from dbus.mainloop.glib import DBusGMainLoop
64
72
import ctypes
65
 
 
66
 
version = "1.0"
67
 
 
 
73
import ctypes.util
 
74
import xml.dom.minidom
 
75
import inspect
 
76
 
 
77
try:
 
78
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
79
except AttributeError:
 
80
    try:
 
81
        from IN import SO_BINDTODEVICE
 
82
    except ImportError:
 
83
        SO_BINDTODEVICE = None
 
84
 
 
85
 
 
86
version = "1.3.1"
 
87
 
 
88
#logger = logging.getLogger('mandos')
68
89
logger = logging.Logger('mandos')
69
 
syslogger = logging.handlers.SysLogHandler\
70
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
 
             address = "/dev/log")
72
 
syslogger.setFormatter(logging.Formatter\
73
 
                        ('Mandos: %(levelname)s: %(message)s'))
 
90
syslogger = (logging.handlers.SysLogHandler
 
91
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
92
              address = str("/dev/log")))
 
93
syslogger.setFormatter(logging.Formatter
 
94
                       ('Mandos [%(process)d]: %(levelname)s:'
 
95
                        ' %(message)s'))
74
96
logger.addHandler(syslogger)
75
97
 
76
98
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
 
99
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
 
100
                                       ' %(levelname)s:'
78
101
                                       ' %(message)s'))
79
102
logger.addHandler(console)
80
103
 
81
104
class AvahiError(Exception):
82
 
    def __init__(self, value):
 
105
    def __init__(self, value, *args, **kwargs):
83
106
        self.value = value
84
 
    def __str__(self):
85
 
        return repr(self.value)
 
107
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
108
    def __unicode__(self):
 
109
        return unicode(repr(self.value))
86
110
 
87
111
class AvahiServiceError(AvahiError):
88
112
    pass
93
117
 
94
118
class AvahiService(object):
95
119
    """An Avahi (Zeroconf) service.
 
120
    
96
121
    Attributes:
97
122
    interface: integer; avahi.IF_UNSPEC or an interface index.
98
123
               Used to optionally bind to the specified interface.
106
131
    max_renames: integer; maximum number of renames
107
132
    rename_count: integer; counter so we only rename after collisions
108
133
                  a sensible number of times
 
134
    group: D-Bus Entry Group
 
135
    server: D-Bus Server
 
136
    bus: dbus.SystemBus()
109
137
    """
110
138
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
111
 
                 type = None, port = None, TXT = None, domain = "",
112
 
                 host = "", max_renames = 32768):
 
139
                 servicetype = None, port = None, TXT = None,
 
140
                 domain = "", host = "", max_renames = 32768,
 
141
                 protocol = avahi.PROTO_UNSPEC, bus = None):
113
142
        self.interface = interface
114
143
        self.name = name
115
 
        self.type = type
 
144
        self.type = servicetype
116
145
        self.port = port
117
 
        if TXT is None:
118
 
            self.TXT = []
119
 
        else:
120
 
            self.TXT = TXT
 
146
        self.TXT = TXT if TXT is not None else []
121
147
        self.domain = domain
122
148
        self.host = host
123
149
        self.rename_count = 0
124
150
        self.max_renames = max_renames
 
151
        self.protocol = protocol
 
152
        self.group = None       # our entry group
 
153
        self.server = None
 
154
        self.bus = bus
 
155
        self.entry_group_state_changed_match = None
125
156
    def rename(self):
126
157
        """Derived from the Avahi example code"""
127
158
        if self.rename_count >= self.max_renames:
128
 
            logger.critical(u"No suitable Zeroconf service name found"
129
 
                            u" after %i retries, exiting.",
130
 
                            rename_count)
 
159
            logger.critical("No suitable Zeroconf service name found"
 
160
                            " after %i retries, exiting.",
 
161
                            self.rename_count)
131
162
            raise AvahiServiceError("Too many renames")
132
 
        self.name = server.GetAlternativeServiceName(self.name)
133
 
        logger.info(u"Changing Zeroconf service name to %r ...",
134
 
                    str(self.name))
135
 
        syslogger.setFormatter(logging.Formatter\
136
 
                               ('Mandos (%s): %%(levelname)s:'
137
 
                               ' %%(message)s' % self.name))
 
163
        self.name = unicode(self.server
 
164
                            .GetAlternativeServiceName(self.name))
 
165
        logger.info("Changing Zeroconf service name to %r ...",
 
166
                    self.name)
 
167
        syslogger.setFormatter(logging.Formatter
 
168
                               ('Mandos (%s) [%%(process)d]:'
 
169
                                ' %%(levelname)s: %%(message)s'
 
170
                                % self.name))
138
171
        self.remove()
139
 
        self.add()
 
172
        try:
 
173
            self.add()
 
174
        except dbus.exceptions.DBusException as error:
 
175
            logger.critical("DBusException: %s", error)
 
176
            self.cleanup()
 
177
            os._exit(1)
140
178
        self.rename_count += 1
141
179
    def remove(self):
142
180
        """Derived from the Avahi example code"""
143
 
        if group is not None:
144
 
            group.Reset()
 
181
        if self.entry_group_state_changed_match is not None:
 
182
            self.entry_group_state_changed_match.remove()
 
183
            self.entry_group_state_changed_match = None
 
184
        if self.group is not None:
 
185
            self.group.Reset()
145
186
    def add(self):
146
187
        """Derived from the Avahi example code"""
147
 
        global group
148
 
        if group is None:
149
 
            group = dbus.Interface\
150
 
                    (bus.get_object(avahi.DBUS_NAME,
151
 
                                    server.EntryGroupNew()),
152
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
153
 
            group.connect_to_signal('StateChanged',
154
 
                                    entry_group_state_changed)
155
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
156
 
                     service.name, service.type)
157
 
        group.AddService(
158
 
                self.interface,         # interface
159
 
                avahi.PROTO_INET6,      # protocol
160
 
                dbus.UInt32(0),         # flags
161
 
                self.name, self.type,
162
 
                self.domain, self.host,
163
 
                dbus.UInt16(self.port),
164
 
                avahi.string_array_to_txt_array(self.TXT))
165
 
        group.Commit()
166
 
 
167
 
# From the Avahi example code:
168
 
group = None                            # our entry group
169
 
# End of Avahi example code
170
 
 
171
 
 
 
188
        self.remove()
 
189
        if self.group is None:
 
190
            self.group = dbus.Interface(
 
191
                self.bus.get_object(avahi.DBUS_NAME,
 
192
                                    self.server.EntryGroupNew()),
 
193
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
194
        self.entry_group_state_changed_match = (
 
195
            self.group.connect_to_signal(
 
196
                'StateChanged', self .entry_group_state_changed))
 
197
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
 
198
                     self.name, self.type)
 
199
        self.group.AddService(
 
200
            self.interface,
 
201
            self.protocol,
 
202
            dbus.UInt32(0),     # flags
 
203
            self.name, self.type,
 
204
            self.domain, self.host,
 
205
            dbus.UInt16(self.port),
 
206
            avahi.string_array_to_txt_array(self.TXT))
 
207
        self.group.Commit()
 
208
    def entry_group_state_changed(self, state, error):
 
209
        """Derived from the Avahi example code"""
 
210
        logger.debug("Avahi entry group state change: %i", state)
 
211
        
 
212
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
213
            logger.debug("Zeroconf service established.")
 
214
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
215
            logger.info("Zeroconf service name collision.")
 
216
            self.rename()
 
217
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
218
            logger.critical("Avahi: Error in group state changed %s",
 
219
                            unicode(error))
 
220
            raise AvahiGroupError("State changed: %s"
 
221
                                  % unicode(error))
 
222
    def cleanup(self):
 
223
        """Derived from the Avahi example code"""
 
224
        if self.group is not None:
 
225
            try:
 
226
                self.group.Free()
 
227
            except (dbus.exceptions.UnknownMethodException,
 
228
                    dbus.exceptions.DBusException) as e:
 
229
                pass
 
230
            self.group = None
 
231
        self.remove()
 
232
    def server_state_changed(self, state, error=None):
 
233
        """Derived from the Avahi example code"""
 
234
        logger.debug("Avahi server state change: %i", state)
 
235
        bad_states = { avahi.SERVER_INVALID:
 
236
                           "Zeroconf server invalid",
 
237
                       avahi.SERVER_REGISTERING: None,
 
238
                       avahi.SERVER_COLLISION:
 
239
                           "Zeroconf server name collision",
 
240
                       avahi.SERVER_FAILURE:
 
241
                           "Zeroconf server failure" }
 
242
        if state in bad_states:
 
243
            if bad_states[state] is not None:
 
244
                if error is None:
 
245
                    logger.error(bad_states[state])
 
246
                else:
 
247
                    logger.error(bad_states[state] + ": %r", error)
 
248
            self.cleanup()
 
249
        elif state == avahi.SERVER_RUNNING:
 
250
            self.add()
 
251
        else:
 
252
            if error is None:
 
253
                logger.debug("Unknown state: %r", state)
 
254
            else:
 
255
                logger.debug("Unknown state: %r: %r", state, error)
 
256
    def activate(self):
 
257
        """Derived from the Avahi example code"""
 
258
        if self.server is None:
 
259
            self.server = dbus.Interface(
 
260
                self.bus.get_object(avahi.DBUS_NAME,
 
261
                                    avahi.DBUS_PATH_SERVER,
 
262
                                    follow_name_owner_changes=True),
 
263
                avahi.DBUS_INTERFACE_SERVER)
 
264
        self.server.connect_to_signal("StateChanged",
 
265
                                 self.server_state_changed)
 
266
        self.server_state_changed(self.server.GetState())
 
267
 
 
268
 
 
269
def _timedelta_to_milliseconds(td):
 
270
    "Convert a datetime.timedelta() to milliseconds"
 
271
    return ((td.days * 24 * 60 * 60 * 1000)
 
272
            + (td.seconds * 1000)
 
273
            + (td.microseconds // 1000))
 
274
        
172
275
class Client(object):
173
276
    """A representation of a client host served by this server.
 
277
    
174
278
    Attributes:
175
 
    name:      string; from the config file, used in log messages
 
279
    _approved:   bool(); 'None' if not yet approved/disapproved
 
280
    approval_delay: datetime.timedelta(); Time to wait for approval
 
281
    approval_duration: datetime.timedelta(); Duration of one approval
 
282
    checker:    subprocess.Popen(); a running checker process used
 
283
                                    to see if the client lives.
 
284
                                    'None' if no process is running.
 
285
    checker_callback_tag: a gobject event source tag, or None
 
286
    checker_command: string; External command which is run to check
 
287
                     if client lives.  %() expansions are done at
 
288
                     runtime with vars(self) as dict, so that for
 
289
                     instance %(name)s can be used in the command.
 
290
    checker_initiator_tag: a gobject event source tag, or None
 
291
    created:    datetime.datetime(); (UTC) object creation
 
292
    current_checker_command: string; current running checker_command
 
293
    disable_hook:  If set, called by disable() as disable_hook(self)
 
294
    disable_initiator_tag: a gobject event source tag, or None
 
295
    enabled:    bool()
176
296
    fingerprint: string (40 or 32 hexadecimal digits); used to
177
297
                 uniquely identify the client
178
 
    secret:    bytestring; sent verbatim (over TLS) to client
179
 
    host:      string; available for use by the checker command
180
 
    created:   datetime.datetime(); object creation, not client host
181
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
182
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
183
 
                                     until this client is invalid
184
 
    interval:  datetime.timedelta(); How often to start a new checker
185
 
    stop_hook: If set, called by stop() as stop_hook(self)
186
 
    checker:   subprocess.Popen(); a running checker process used
187
 
                                   to see if the client lives.
188
 
                                   'None' if no process is running.
189
 
    checker_initiator_tag: a gobject event source tag, or None
190
 
    stop_initiator_tag:    - '' -
191
 
    checker_callback_tag:  - '' -
192
 
    checker_command: string; External command which is run to check if
193
 
                     client lives.  %() expansions are done at
194
 
                     runtime with vars(self) as dict, so that for
195
 
                     instance %(name)s can be used in the command.
196
 
    Private attibutes:
197
 
    _timeout: Real variable for 'timeout'
198
 
    _interval: Real variable for 'interval'
199
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
200
 
    _interval_milliseconds: - '' -
 
298
    host:       string; available for use by the checker command
 
299
    interval:   datetime.timedelta(); How often to start a new checker
 
300
    last_approval_request: datetime.datetime(); (UTC) or None
 
301
    last_checked_ok: datetime.datetime(); (UTC) or None
 
302
    last_enabled: datetime.datetime(); (UTC)
 
303
    name:       string; from the config file, used in log messages and
 
304
                        D-Bus identifiers
 
305
    secret:     bytestring; sent verbatim (over TLS) to client
 
306
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
307
                                      until this client is disabled
 
308
    extended_timeout:   extra long timeout when password has been sent
 
309
    runtime_expansions: Allowed attributes for runtime expansion.
 
310
    expires:    datetime.datetime(); time (UTC) when a client will be
 
311
                disabled, or None
201
312
    """
202
 
    def _set_timeout(self, timeout):
203
 
        "Setter function for 'timeout' attribute"
204
 
        self._timeout = timeout
205
 
        self._timeout_milliseconds = ((self.timeout.days
206
 
                                       * 24 * 60 * 60 * 1000)
207
 
                                      + (self.timeout.seconds * 1000)
208
 
                                      + (self.timeout.microseconds
209
 
                                         // 1000))
210
 
    timeout = property(lambda self: self._timeout,
211
 
                       _set_timeout)
212
 
    del _set_timeout
213
 
    def _set_interval(self, interval):
214
 
        "Setter function for 'interval' attribute"
215
 
        self._interval = interval
216
 
        self._interval_milliseconds = ((self.interval.days
217
 
                                        * 24 * 60 * 60 * 1000)
218
 
                                       + (self.interval.seconds
219
 
                                          * 1000)
220
 
                                       + (self.interval.microseconds
221
 
                                          // 1000))
222
 
    interval = property(lambda self: self._interval,
223
 
                        _set_interval)
224
 
    del _set_interval
225
 
    def __init__(self, name = None, stop_hook=None, config={}):
 
313
    
 
314
    runtime_expansions = ("approval_delay", "approval_duration",
 
315
                          "created", "enabled", "fingerprint",
 
316
                          "host", "interval", "last_checked_ok",
 
317
                          "last_enabled", "name", "timeout")
 
318
    
 
319
    def timeout_milliseconds(self):
 
320
        "Return the 'timeout' attribute in milliseconds"
 
321
        return _timedelta_to_milliseconds(self.timeout)
 
322
    
 
323
    def extended_timeout_milliseconds(self):
 
324
        "Return the 'extended_timeout' attribute in milliseconds"
 
325
        return _timedelta_to_milliseconds(self.extended_timeout)
 
326
    
 
327
    def interval_milliseconds(self):
 
328
        "Return the 'interval' attribute in milliseconds"
 
329
        return _timedelta_to_milliseconds(self.interval)
 
330
    
 
331
    def approval_delay_milliseconds(self):
 
332
        return _timedelta_to_milliseconds(self.approval_delay)
 
333
    
 
334
    def __init__(self, name = None, disable_hook=None, config=None):
226
335
        """Note: the 'checker' key in 'config' sets the
227
336
        'checker_command' attribute and *not* the 'checker'
228
337
        attribute."""
229
338
        self.name = name
230
 
        logger.debug(u"Creating client %r", self.name)
 
339
        if config is None:
 
340
            config = {}
 
341
        logger.debug("Creating client %r", self.name)
231
342
        # Uppercase and remove spaces from fingerprint for later
232
343
        # comparison purposes with return value from the fingerprint()
233
344
        # function
234
 
        self.fingerprint = config["fingerprint"].upper()\
235
 
                           .replace(u" ", u"")
236
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
345
        self.fingerprint = (config["fingerprint"].upper()
 
346
                            .replace(" ", ""))
 
347
        logger.debug("  Fingerprint: %s", self.fingerprint)
237
348
        if "secret" in config:
238
 
            self.secret = config["secret"].decode(u"base64")
 
349
            self.secret = config["secret"].decode("base64")
239
350
        elif "secfile" in config:
240
 
            sf = open(config["secfile"])
241
 
            self.secret = sf.read()
242
 
            sf.close()
 
351
            with open(os.path.expanduser(os.path.expandvars
 
352
                                         (config["secfile"])),
 
353
                      "rb") as secfile:
 
354
                self.secret = secfile.read()
243
355
        else:
244
 
            raise TypeError(u"No secret or secfile for client %s"
 
356
            raise TypeError("No secret or secfile for client %s"
245
357
                            % self.name)
246
358
        self.host = config.get("host", "")
247
 
        self.created = datetime.datetime.now()
 
359
        self.created = datetime.datetime.utcnow()
 
360
        self.enabled = False
 
361
        self.last_approval_request = None
 
362
        self.last_enabled = None
248
363
        self.last_checked_ok = None
249
364
        self.timeout = string_to_delta(config["timeout"])
 
365
        self.extended_timeout = string_to_delta(config
 
366
                                                ["extended_timeout"])
250
367
        self.interval = string_to_delta(config["interval"])
251
 
        self.stop_hook = stop_hook
 
368
        self.disable_hook = disable_hook
252
369
        self.checker = None
253
370
        self.checker_initiator_tag = None
254
 
        self.stop_initiator_tag = None
 
371
        self.disable_initiator_tag = None
 
372
        self.expires = None
255
373
        self.checker_callback_tag = None
256
 
        self.check_command = config["checker"]
257
 
    def start(self):
 
374
        self.checker_command = config["checker"]
 
375
        self.current_checker_command = None
 
376
        self.last_connect = None
 
377
        self._approved = None
 
378
        self.approved_by_default = config.get("approved_by_default",
 
379
                                              True)
 
380
        self.approvals_pending = 0
 
381
        self.approval_delay = string_to_delta(
 
382
            config["approval_delay"])
 
383
        self.approval_duration = string_to_delta(
 
384
            config["approval_duration"])
 
385
        self.changedstate = (multiprocessing_manager
 
386
                             .Condition(multiprocessing_manager
 
387
                                        .Lock()))
 
388
    
 
389
    def send_changedstate(self):
 
390
        self.changedstate.acquire()
 
391
        self.changedstate.notify_all()
 
392
        self.changedstate.release()
 
393
    
 
394
    def enable(self):
258
395
        """Start this client's checker and timeout hooks"""
 
396
        if getattr(self, "enabled", False):
 
397
            # Already enabled
 
398
            return
 
399
        self.send_changedstate()
259
400
        # Schedule a new checker to be started an 'interval' from now,
260
401
        # and every interval from then on.
261
 
        self.checker_initiator_tag = gobject.timeout_add\
262
 
                                     (self._interval_milliseconds,
263
 
                                      self.start_checker)
 
402
        self.checker_initiator_tag = (gobject.timeout_add
 
403
                                      (self.interval_milliseconds(),
 
404
                                       self.start_checker))
 
405
        # Schedule a disable() when 'timeout' has passed
 
406
        self.expires = datetime.datetime.utcnow() + self.timeout
 
407
        self.disable_initiator_tag = (gobject.timeout_add
 
408
                                   (self.timeout_milliseconds(),
 
409
                                    self.disable))
 
410
        self.enabled = True
 
411
        self.last_enabled = datetime.datetime.utcnow()
264
412
        # Also start a new checker *right now*.
265
413
        self.start_checker()
266
 
        # Schedule a stop() when 'timeout' has passed
267
 
        self.stop_initiator_tag = gobject.timeout_add\
268
 
                                  (self._timeout_milliseconds,
269
 
                                   self.stop)
270
 
    def stop(self):
271
 
        """Stop this client.
272
 
        The possibility that a client might be restarted is left open,
273
 
        but not currently used."""
274
 
        # If this client doesn't have a secret, it is already stopped.
275
 
        if hasattr(self, "secret") and self.secret:
276
 
            logger.info(u"Stopping client %s", self.name)
277
 
            self.secret = None
278
 
        else:
 
414
    
 
415
    def disable(self, quiet=True):
 
416
        """Disable this client."""
 
417
        if not getattr(self, "enabled", False):
279
418
            return False
280
 
        if getattr(self, "stop_initiator_tag", False):
281
 
            gobject.source_remove(self.stop_initiator_tag)
282
 
            self.stop_initiator_tag = None
 
419
        if not quiet:
 
420
            self.send_changedstate()
 
421
        if not quiet:
 
422
            logger.info("Disabling client %s", self.name)
 
423
        if getattr(self, "disable_initiator_tag", False):
 
424
            gobject.source_remove(self.disable_initiator_tag)
 
425
            self.disable_initiator_tag = None
 
426
        self.expires = None
283
427
        if getattr(self, "checker_initiator_tag", False):
284
428
            gobject.source_remove(self.checker_initiator_tag)
285
429
            self.checker_initiator_tag = None
286
430
        self.stop_checker()
287
 
        if self.stop_hook:
288
 
            self.stop_hook(self)
 
431
        if self.disable_hook:
 
432
            self.disable_hook(self)
 
433
        self.enabled = False
289
434
        # Do not run this again if called by a gobject.timeout_add
290
435
        return False
 
436
    
291
437
    def __del__(self):
292
 
        self.stop_hook = None
293
 
        self.stop()
294
 
    def checker_callback(self, pid, condition):
 
438
        self.disable_hook = None
 
439
        self.disable()
 
440
    
 
441
    def checker_callback(self, pid, condition, command):
295
442
        """The checker has completed, so take appropriate actions."""
296
 
        now = datetime.datetime.now()
297
443
        self.checker_callback_tag = None
298
444
        self.checker = None
299
 
        if os.WIFEXITED(condition) \
300
 
               and (os.WEXITSTATUS(condition) == 0):
301
 
            logger.info(u"Checker for %(name)s succeeded",
302
 
                        vars(self))
303
 
            self.last_checked_ok = now
304
 
            gobject.source_remove(self.stop_initiator_tag)
305
 
            self.stop_initiator_tag = gobject.timeout_add\
306
 
                                      (self._timeout_milliseconds,
307
 
                                       self.stop)
308
 
        elif not os.WIFEXITED(condition):
309
 
            logger.warning(u"Checker for %(name)s crashed?",
 
445
        if os.WIFEXITED(condition):
 
446
            exitstatus = os.WEXITSTATUS(condition)
 
447
            if exitstatus == 0:
 
448
                logger.info("Checker for %(name)s succeeded",
 
449
                            vars(self))
 
450
                self.checked_ok()
 
451
            else:
 
452
                logger.info("Checker for %(name)s failed",
 
453
                            vars(self))
 
454
        else:
 
455
            logger.warning("Checker for %(name)s crashed?",
310
456
                           vars(self))
311
 
        else:
312
 
            logger.info(u"Checker for %(name)s failed",
313
 
                        vars(self))
 
457
    
 
458
    def checked_ok(self, timeout=None):
 
459
        """Bump up the timeout for this client.
 
460
        
 
461
        This should only be called when the client has been seen,
 
462
        alive and well.
 
463
        """
 
464
        if timeout is None:
 
465
            timeout = self.timeout
 
466
        self.last_checked_ok = datetime.datetime.utcnow()
 
467
        gobject.source_remove(self.disable_initiator_tag)
 
468
        self.disable_initiator_tag = (gobject.timeout_add
 
469
                                      (_timedelta_to_milliseconds
 
470
                                       (timeout), self.disable))
 
471
        self.expires = datetime.datetime.utcnow() + timeout
 
472
    
 
473
    def need_approval(self):
 
474
        self.last_approval_request = datetime.datetime.utcnow()
 
475
    
314
476
    def start_checker(self):
315
477
        """Start a new checker subprocess if one is not running.
 
478
        
316
479
        If a checker already exists, leave it running and do
317
480
        nothing."""
318
481
        # The reason for not killing a running checker is that if we
321
484
        # client would inevitably timeout, since no checker would get
322
485
        # a chance to run to completion.  If we instead leave running
323
486
        # checkers alone, the checker would have to take more time
324
 
        # than 'timeout' for the client to be declared invalid, which
325
 
        # is as it should be.
 
487
        # than 'timeout' for the client to be disabled, which is as it
 
488
        # should be.
 
489
        
 
490
        # If a checker exists, make sure it is not a zombie
 
491
        try:
 
492
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
493
        except (AttributeError, OSError) as error:
 
494
            if (isinstance(error, OSError)
 
495
                and error.errno != errno.ECHILD):
 
496
                raise error
 
497
        else:
 
498
            if pid:
 
499
                logger.warning("Checker was a zombie")
 
500
                gobject.source_remove(self.checker_callback_tag)
 
501
                self.checker_callback(pid, status,
 
502
                                      self.current_checker_command)
 
503
        # Start a new checker if needed
326
504
        if self.checker is None:
327
505
            try:
328
 
                # In case check_command has exactly one % operator
329
 
                command = self.check_command % self.host
 
506
                # In case checker_command has exactly one % operator
 
507
                command = self.checker_command % self.host
330
508
            except TypeError:
331
509
                # Escape attributes for the shell
332
 
                escaped_attrs = dict((key, re.escape(str(val)))
333
 
                                     for key, val in
334
 
                                     vars(self).iteritems())
 
510
                escaped_attrs = dict(
 
511
                    (attr,
 
512
                     re.escape(unicode(str(getattr(self, attr, "")),
 
513
                                       errors=
 
514
                                       'replace')))
 
515
                    for attr in
 
516
                    self.runtime_expansions)
 
517
                
335
518
                try:
336
 
                    command = self.check_command % escaped_attrs
337
 
                except TypeError, error:
338
 
                    logger.error(u'Could not format string "%s":'
339
 
                                 u' %s', self.check_command, error)
 
519
                    command = self.checker_command % escaped_attrs
 
520
                except TypeError as error:
 
521
                    logger.error('Could not format string "%s":'
 
522
                                 ' %s', self.checker_command, error)
340
523
                    return True # Try again later
 
524
            self.current_checker_command = command
341
525
            try:
342
 
                logger.info(u"Starting checker %r for %s",
 
526
                logger.info("Starting checker %r for %s",
343
527
                            command, self.name)
344
528
                # We don't need to redirect stdout and stderr, since
345
529
                # in normal mode, that is already done by daemon(),
348
532
                self.checker = subprocess.Popen(command,
349
533
                                                close_fds=True,
350
534
                                                shell=True, cwd="/")
351
 
                self.checker_callback_tag = gobject.child_watch_add\
352
 
                                            (self.checker.pid,
353
 
                                             self.checker_callback)
354
 
            except OSError, error:
355
 
                logger.error(u"Failed to start subprocess: %s",
 
535
                self.checker_callback_tag = (gobject.child_watch_add
 
536
                                             (self.checker.pid,
 
537
                                              self.checker_callback,
 
538
                                              data=command))
 
539
                # The checker may have completed before the gobject
 
540
                # watch was added.  Check for this.
 
541
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
542
                if pid:
 
543
                    gobject.source_remove(self.checker_callback_tag)
 
544
                    self.checker_callback(pid, status, command)
 
545
            except OSError as error:
 
546
                logger.error("Failed to start subprocess: %s",
356
547
                             error)
357
548
        # Re-run this periodically if run by gobject.timeout_add
358
549
        return True
 
550
    
359
551
    def stop_checker(self):
360
552
        """Force the checker process, if any, to stop."""
361
553
        if self.checker_callback_tag:
363
555
            self.checker_callback_tag = None
364
556
        if getattr(self, "checker", None) is None:
365
557
            return
366
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
558
        logger.debug("Stopping checker for %(name)s", vars(self))
367
559
        try:
368
560
            os.kill(self.checker.pid, signal.SIGTERM)
369
 
            #os.sleep(0.5)
 
561
            #time.sleep(0.5)
370
562
            #if self.checker.poll() is None:
371
563
            #    os.kill(self.checker.pid, signal.SIGKILL)
372
 
        except OSError, error:
 
564
        except OSError as error:
373
565
            if error.errno != errno.ESRCH: # No such process
374
566
                raise
375
567
        self.checker = None
376
 
    def still_valid(self):
377
 
        """Has the timeout not yet passed for this client?"""
378
 
        now = datetime.datetime.now()
379
 
        if self.last_checked_ok is None:
380
 
            return now < (self.created + self.timeout)
381
 
        else:
382
 
            return now < (self.last_checked_ok + self.timeout)
383
 
 
384
 
 
385
 
def peer_certificate(session):
386
 
    "Return the peer's OpenPGP certificate as a bytestring"
387
 
    # If not an OpenPGP certificate...
388
 
    if gnutls.library.functions.gnutls_certificate_type_get\
389
 
            (session._c_object) \
390
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
391
 
        # ...do the normal thing
392
 
        return session.peer_certificate
393
 
    list_size = ctypes.c_uint()
394
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
395
 
        (session._c_object, ctypes.byref(list_size))
396
 
    if list_size.value == 0:
397
 
        return None
398
 
    cert = cert_list[0]
399
 
    return ctypes.string_at(cert.data, cert.size)
400
 
 
401
 
 
402
 
def fingerprint(openpgp):
403
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
404
 
    # New GnuTLS "datum" with the OpenPGP public key
405
 
    datum = gnutls.library.types.gnutls_datum_t\
406
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
407
 
                     ctypes.POINTER(ctypes.c_ubyte)),
408
 
         ctypes.c_uint(len(openpgp)))
409
 
    # New empty GnuTLS certificate
410
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
411
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
412
 
        (ctypes.byref(crt))
413
 
    # Import the OpenPGP public key into the certificate
414
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
415
 
                    (crt, ctypes.byref(datum),
416
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
417
 
    # Verify the self signature in the key
418
 
    crtverify = ctypes.c_uint();
419
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
420
 
        (crt, 0, ctypes.byref(crtverify))
421
 
    if crtverify.value != 0:
422
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
423
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
424
 
    # New buffer for the fingerprint
425
 
    buffer = ctypes.create_string_buffer(20)
426
 
    buffer_length = ctypes.c_size_t()
427
 
    # Get the fingerprint from the certificate into the buffer
428
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
429
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
430
 
    # Deinit the certificate
431
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
432
 
    # Convert the buffer to a Python bytestring
433
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
434
 
    # Convert the bytestring to hexadecimal notation
435
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
436
 
    return hex_fpr
437
 
 
438
 
 
439
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
440
 
    """A TCP request handler class.
441
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
568
 
 
569
 
 
570
def dbus_service_property(dbus_interface, signature="v",
 
571
                          access="readwrite", byte_arrays=False):
 
572
    """Decorators for marking methods of a DBusObjectWithProperties to
 
573
    become properties on the D-Bus.
 
574
    
 
575
    The decorated method will be called with no arguments by "Get"
 
576
    and with one argument by "Set".
 
577
    
 
578
    The parameters, where they are supported, are the same as
 
579
    dbus.service.method, except there is only "signature", since the
 
580
    type from Get() and the type sent to Set() is the same.
 
581
    """
 
582
    # Encoding deeply encoded byte arrays is not supported yet by the
 
583
    # "Set" method, so we fail early here:
 
584
    if byte_arrays and signature != "ay":
 
585
        raise ValueError("Byte arrays not supported for non-'ay'"
 
586
                         " signature %r" % signature)
 
587
    def decorator(func):
 
588
        func._dbus_is_property = True
 
589
        func._dbus_interface = dbus_interface
 
590
        func._dbus_signature = signature
 
591
        func._dbus_access = access
 
592
        func._dbus_name = func.__name__
 
593
        if func._dbus_name.endswith("_dbus_property"):
 
594
            func._dbus_name = func._dbus_name[:-14]
 
595
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
 
596
        return func
 
597
    return decorator
 
598
 
 
599
 
 
600
class DBusPropertyException(dbus.exceptions.DBusException):
 
601
    """A base class for D-Bus property-related exceptions
 
602
    """
 
603
    def __unicode__(self):
 
604
        return unicode(str(self))
 
605
 
 
606
 
 
607
class DBusPropertyAccessException(DBusPropertyException):
 
608
    """A property's access permissions disallows an operation.
 
609
    """
 
610
    pass
 
611
 
 
612
 
 
613
class DBusPropertyNotFound(DBusPropertyException):
 
614
    """An attempt was made to access a non-existing property.
 
615
    """
 
616
    pass
 
617
 
 
618
 
 
619
class DBusObjectWithProperties(dbus.service.Object):
 
620
    """A D-Bus object with properties.
 
621
    
 
622
    Classes inheriting from this can use the dbus_service_property
 
623
    decorator to expose methods as D-Bus properties.  It exposes the
 
624
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
625
    """
 
626
    
 
627
    @staticmethod
 
628
    def _is_dbus_property(obj):
 
629
        return getattr(obj, "_dbus_is_property", False)
 
630
    
 
631
    def _get_all_dbus_properties(self):
 
632
        """Returns a generator of (name, attribute) pairs
 
633
        """
 
634
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
 
635
                for cls in self.__class__.__mro__
 
636
                for name, prop in
 
637
                inspect.getmembers(cls, self._is_dbus_property))
 
638
    
 
639
    def _get_dbus_property(self, interface_name, property_name):
 
640
        """Returns a bound method if one exists which is a D-Bus
 
641
        property with the specified name and interface.
 
642
        """
 
643
        for cls in  self.__class__.__mro__:
 
644
            for name, value in (inspect.getmembers
 
645
                                (cls, self._is_dbus_property)):
 
646
                if (value._dbus_name == property_name
 
647
                    and value._dbus_interface == interface_name):
 
648
                    return value.__get__(self)
 
649
        
 
650
        # No such property
 
651
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
 
652
                                   + interface_name + "."
 
653
                                   + property_name)
 
654
    
 
655
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
 
656
                         out_signature="v")
 
657
    def Get(self, interface_name, property_name):
 
658
        """Standard D-Bus property Get() method, see D-Bus standard.
 
659
        """
 
660
        prop = self._get_dbus_property(interface_name, property_name)
 
661
        if prop._dbus_access == "write":
 
662
            raise DBusPropertyAccessException(property_name)
 
663
        value = prop()
 
664
        if not hasattr(value, "variant_level"):
 
665
            return value
 
666
        return type(value)(value, variant_level=value.variant_level+1)
 
667
    
 
668
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
 
669
    def Set(self, interface_name, property_name, value):
 
670
        """Standard D-Bus property Set() method, see D-Bus standard.
 
671
        """
 
672
        prop = self._get_dbus_property(interface_name, property_name)
 
673
        if prop._dbus_access == "read":
 
674
            raise DBusPropertyAccessException(property_name)
 
675
        if prop._dbus_get_args_options["byte_arrays"]:
 
676
            # The byte_arrays option is not supported yet on
 
677
            # signatures other than "ay".
 
678
            if prop._dbus_signature != "ay":
 
679
                raise ValueError
 
680
            value = dbus.ByteArray(''.join(unichr(byte)
 
681
                                           for byte in value))
 
682
        prop(value)
 
683
    
 
684
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
 
685
                         out_signature="a{sv}")
 
686
    def GetAll(self, interface_name):
 
687
        """Standard D-Bus property GetAll() method, see D-Bus
 
688
        standard.
 
689
        
 
690
        Note: Will not include properties with access="write".
 
691
        """
 
692
        all = {}
 
693
        for name, prop in self._get_all_dbus_properties():
 
694
            if (interface_name
 
695
                and interface_name != prop._dbus_interface):
 
696
                # Interface non-empty but did not match
 
697
                continue
 
698
            # Ignore write-only properties
 
699
            if prop._dbus_access == "write":
 
700
                continue
 
701
            value = prop()
 
702
            if not hasattr(value, "variant_level"):
 
703
                all[name] = value
 
704
                continue
 
705
            all[name] = type(value)(value, variant_level=
 
706
                                    value.variant_level+1)
 
707
        return dbus.Dictionary(all, signature="sv")
 
708
    
 
709
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
710
                         out_signature="s",
 
711
                         path_keyword='object_path',
 
712
                         connection_keyword='connection')
 
713
    def Introspect(self, object_path, connection):
 
714
        """Standard D-Bus method, overloaded to insert property tags.
 
715
        """
 
716
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
717
                                                   connection)
 
718
        try:
 
719
            document = xml.dom.minidom.parseString(xmlstring)
 
720
            def make_tag(document, name, prop):
 
721
                e = document.createElement("property")
 
722
                e.setAttribute("name", name)
 
723
                e.setAttribute("type", prop._dbus_signature)
 
724
                e.setAttribute("access", prop._dbus_access)
 
725
                return e
 
726
            for if_tag in document.getElementsByTagName("interface"):
 
727
                for tag in (make_tag(document, name, prop)
 
728
                            for name, prop
 
729
                            in self._get_all_dbus_properties()
 
730
                            if prop._dbus_interface
 
731
                            == if_tag.getAttribute("name")):
 
732
                    if_tag.appendChild(tag)
 
733
                # Add the names to the return values for the
 
734
                # "org.freedesktop.DBus.Properties" methods
 
735
                if (if_tag.getAttribute("name")
 
736
                    == "org.freedesktop.DBus.Properties"):
 
737
                    for cn in if_tag.getElementsByTagName("method"):
 
738
                        if cn.getAttribute("name") == "Get":
 
739
                            for arg in cn.getElementsByTagName("arg"):
 
740
                                if (arg.getAttribute("direction")
 
741
                                    == "out"):
 
742
                                    arg.setAttribute("name", "value")
 
743
                        elif cn.getAttribute("name") == "GetAll":
 
744
                            for arg in cn.getElementsByTagName("arg"):
 
745
                                if (arg.getAttribute("direction")
 
746
                                    == "out"):
 
747
                                    arg.setAttribute("name", "props")
 
748
            xmlstring = document.toxml("utf-8")
 
749
            document.unlink()
 
750
        except (AttributeError, xml.dom.DOMException,
 
751
                xml.parsers.expat.ExpatError) as error:
 
752
            logger.error("Failed to override Introspection method",
 
753
                         error)
 
754
        return xmlstring
 
755
 
 
756
 
 
757
def datetime_to_dbus (dt, variant_level=0):
 
758
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
759
    if dt is None:
 
760
        return dbus.String("", variant_level = variant_level)
 
761
    return dbus.String(dt.isoformat(),
 
762
                       variant_level=variant_level)
 
763
 
 
764
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
 
765
                                  .__metaclass__):
 
766
    """Applied to an empty subclass of a D-Bus object, this metaclass
 
767
    will add additional D-Bus attributes matching a certain pattern.
 
768
    """
 
769
    def __new__(mcs, name, bases, attr):
 
770
        # Go through all the base classes which could have D-Bus
 
771
        # methods, signals, or properties in them
 
772
        for base in (b for b in bases
 
773
                     if issubclass(b, dbus.service.Object)):
 
774
            # Go though all attributes of the base class
 
775
            for attrname, attribute in inspect.getmembers(base):
 
776
                # Ignore non-D-Bus attributes, and D-Bus attributes
 
777
                # with the wrong interface name
 
778
                if (not hasattr(attribute, "_dbus_interface")
 
779
                    or not attribute._dbus_interface
 
780
                    .startswith("se.recompile.Mandos")):
 
781
                    continue
 
782
                # Create an alternate D-Bus interface name based on
 
783
                # the current name
 
784
                alt_interface = (attribute._dbus_interface
 
785
                                 .replace("se.recompile.Mandos",
 
786
                                          "se.bsnet.fukt.Mandos"))
 
787
                # Is this a D-Bus signal?
 
788
                if getattr(attribute, "_dbus_is_signal", False):
 
789
                    # Extract the original non-method function by
 
790
                    # black magic
 
791
                    nonmethod_func = (dict(
 
792
                            zip(attribute.func_code.co_freevars,
 
793
                                attribute.__closure__))["func"]
 
794
                                      .cell_contents)
 
795
                    # Create a new, but exactly alike, function
 
796
                    # object, and decorate it to be a new D-Bus signal
 
797
                    # with the alternate D-Bus interface name
 
798
                    new_function = (dbus.service.signal
 
799
                                    (alt_interface,
 
800
                                     attribute._dbus_signature)
 
801
                                    (types.FunctionType(
 
802
                                nonmethod_func.func_code,
 
803
                                nonmethod_func.func_globals,
 
804
                                nonmethod_func.func_name,
 
805
                                nonmethod_func.func_defaults,
 
806
                                nonmethod_func.func_closure)))
 
807
                    # Define a creator of a function to call both the
 
808
                    # old and new functions, so both the old and new
 
809
                    # signals gets sent when the function is called
 
810
                    def fixscope(func1, func2):
 
811
                        """This function is a scope container to pass
 
812
                        func1 and func2 to the "call_both" function
 
813
                        outside of its arguments"""
 
814
                        def call_both(*args, **kwargs):
 
815
                            """This function will emit two D-Bus
 
816
                            signals by calling func1 and func2"""
 
817
                            func1(*args, **kwargs)
 
818
                            func2(*args, **kwargs)
 
819
                        return call_both
 
820
                    # Create the "call_both" function and add it to
 
821
                    # the class
 
822
                    attr[attrname] = fixscope(attribute,
 
823
                                              new_function)
 
824
                # Is this a D-Bus method?
 
825
                elif getattr(attribute, "_dbus_is_method", False):
 
826
                    # Create a new, but exactly alike, function
 
827
                    # object.  Decorate it to be a new D-Bus method
 
828
                    # with the alternate D-Bus interface name.  Add it
 
829
                    # to the class.
 
830
                    attr[attrname] = (dbus.service.method
 
831
                                      (alt_interface,
 
832
                                       attribute._dbus_in_signature,
 
833
                                       attribute._dbus_out_signature)
 
834
                                      (types.FunctionType
 
835
                                       (attribute.func_code,
 
836
                                        attribute.func_globals,
 
837
                                        attribute.func_name,
 
838
                                        attribute.func_defaults,
 
839
                                        attribute.func_closure)))
 
840
                # Is this a D-Bus property?
 
841
                elif getattr(attribute, "_dbus_is_property", False):
 
842
                    # Create a new, but exactly alike, function
 
843
                    # object, and decorate it to be a new D-Bus
 
844
                    # property with the alternate D-Bus interface
 
845
                    # name.  Add it to the class.
 
846
                    attr[attrname] = (dbus_service_property
 
847
                                      (alt_interface,
 
848
                                       attribute._dbus_signature,
 
849
                                       attribute._dbus_access,
 
850
                                       attribute
 
851
                                       ._dbus_get_args_options
 
852
                                       ["byte_arrays"])
 
853
                                      (types.FunctionType
 
854
                                       (attribute.func_code,
 
855
                                        attribute.func_globals,
 
856
                                        attribute.func_name,
 
857
                                        attribute.func_defaults,
 
858
                                        attribute.func_closure)))
 
859
        return type.__new__(mcs, name, bases, attr)
 
860
 
 
861
class ClientDBus(Client, DBusObjectWithProperties):
 
862
    """A Client class using D-Bus
 
863
    
 
864
    Attributes:
 
865
    dbus_object_path: dbus.ObjectPath
 
866
    bus: dbus.SystemBus()
 
867
    """
 
868
    
 
869
    runtime_expansions = (Client.runtime_expansions
 
870
                          + ("dbus_object_path",))
 
871
    
 
872
    # dbus.service.Object doesn't use super(), so we can't either.
 
873
    
 
874
    def __init__(self, bus = None, *args, **kwargs):
 
875
        self._approvals_pending = 0
 
876
        self.bus = bus
 
877
        Client.__init__(self, *args, **kwargs)
 
878
        # Only now, when this client is initialized, can it show up on
 
879
        # the D-Bus
 
880
        client_object_name = unicode(self.name).translate(
 
881
            {ord("."): ord("_"),
 
882
             ord("-"): ord("_")})
 
883
        self.dbus_object_path = (dbus.ObjectPath
 
884
                                 ("/clients/" + client_object_name))
 
885
        DBusObjectWithProperties.__init__(self, self.bus,
 
886
                                          self.dbus_object_path)
 
887
        
 
888
    def notifychangeproperty(transform_func,
 
889
                             dbus_name, type_func=lambda x: x,
 
890
                             variant_level=1):
 
891
        """ Modify a variable so that it's a property which announces
 
892
        its changes to DBus.
 
893
 
 
894
        transform_fun: Function that takes a value and transforms it
 
895
                       to a D-Bus type.
 
896
        dbus_name: D-Bus name of the variable
 
897
        type_func: Function that transform the value before sending it
 
898
                   to the D-Bus.  Default: no transform
 
899
        variant_level: D-Bus variant level.  Default: 1
 
900
        """
 
901
        attrname = "_{0}".format(dbus_name)
 
902
        def setter(self, value):
 
903
            if hasattr(self, "dbus_object_path"):
 
904
                if (not hasattr(self, attrname) or
 
905
                    type_func(getattr(self, attrname, None))
 
906
                    != type_func(value)):
 
907
                    dbus_value = transform_func(type_func(value),
 
908
                                                variant_level)
 
909
                    self.PropertyChanged(dbus.String(dbus_name),
 
910
                                         dbus_value)
 
911
            setattr(self, attrname, value)
 
912
        
 
913
        return property(lambda self: getattr(self, attrname), setter)
 
914
    
 
915
    
 
916
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
 
917
    approvals_pending = notifychangeproperty(dbus.Boolean,
 
918
                                             "ApprovalPending",
 
919
                                             type_func = bool)
 
920
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
 
921
    last_enabled = notifychangeproperty(datetime_to_dbus,
 
922
                                        "LastEnabled")
 
923
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
 
924
                                   type_func = lambda checker:
 
925
                                       checker is not None)
 
926
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
 
927
                                           "LastCheckedOK")
 
928
    last_approval_request = notifychangeproperty(
 
929
        datetime_to_dbus, "LastApprovalRequest")
 
930
    approved_by_default = notifychangeproperty(dbus.Boolean,
 
931
                                               "ApprovedByDefault")
 
932
    approval_delay = notifychangeproperty(dbus.UInt16,
 
933
                                          "ApprovalDelay",
 
934
                                          type_func =
 
935
                                          _timedelta_to_milliseconds)
 
936
    approval_duration = notifychangeproperty(
 
937
        dbus.UInt16, "ApprovalDuration",
 
938
        type_func = _timedelta_to_milliseconds)
 
939
    host = notifychangeproperty(dbus.String, "Host")
 
940
    timeout = notifychangeproperty(dbus.UInt16, "Timeout",
 
941
                                   type_func =
 
942
                                   _timedelta_to_milliseconds)
 
943
    extended_timeout = notifychangeproperty(
 
944
        dbus.UInt16, "ExtendedTimeout",
 
945
        type_func = _timedelta_to_milliseconds)
 
946
    interval = notifychangeproperty(dbus.UInt16,
 
947
                                    "Interval",
 
948
                                    type_func =
 
949
                                    _timedelta_to_milliseconds)
 
950
    checker_command = notifychangeproperty(dbus.String, "Checker")
 
951
    
 
952
    del notifychangeproperty
 
953
    
 
954
    def __del__(self, *args, **kwargs):
 
955
        try:
 
956
            self.remove_from_connection()
 
957
        except LookupError:
 
958
            pass
 
959
        if hasattr(DBusObjectWithProperties, "__del__"):
 
960
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
961
        Client.__del__(self, *args, **kwargs)
 
962
    
 
963
    def checker_callback(self, pid, condition, command,
 
964
                         *args, **kwargs):
 
965
        self.checker_callback_tag = None
 
966
        self.checker = None
 
967
        if os.WIFEXITED(condition):
 
968
            exitstatus = os.WEXITSTATUS(condition)
 
969
            # Emit D-Bus signal
 
970
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
971
                                  dbus.Int64(condition),
 
972
                                  dbus.String(command))
 
973
        else:
 
974
            # Emit D-Bus signal
 
975
            self.CheckerCompleted(dbus.Int16(-1),
 
976
                                  dbus.Int64(condition),
 
977
                                  dbus.String(command))
 
978
        
 
979
        return Client.checker_callback(self, pid, condition, command,
 
980
                                       *args, **kwargs)
 
981
    
 
982
    def start_checker(self, *args, **kwargs):
 
983
        old_checker = self.checker
 
984
        if self.checker is not None:
 
985
            old_checker_pid = self.checker.pid
 
986
        else:
 
987
            old_checker_pid = None
 
988
        r = Client.start_checker(self, *args, **kwargs)
 
989
        # Only if new checker process was started
 
990
        if (self.checker is not None
 
991
            and old_checker_pid != self.checker.pid):
 
992
            # Emit D-Bus signal
 
993
            self.CheckerStarted(self.current_checker_command)
 
994
        return r
 
995
    
 
996
    def _reset_approved(self):
 
997
        self._approved = None
 
998
        return False
 
999
    
 
1000
    def approve(self, value=True):
 
1001
        self.send_changedstate()
 
1002
        self._approved = value
 
1003
        gobject.timeout_add(_timedelta_to_milliseconds
 
1004
                            (self.approval_duration),
 
1005
                            self._reset_approved)
 
1006
    
 
1007
    
 
1008
    ## D-Bus methods, signals & properties
 
1009
    _interface = "se.recompile.Mandos.Client"
 
1010
    
 
1011
    ## Signals
 
1012
    
 
1013
    # CheckerCompleted - signal
 
1014
    @dbus.service.signal(_interface, signature="nxs")
 
1015
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
1016
        "D-Bus signal"
 
1017
        pass
 
1018
    
 
1019
    # CheckerStarted - signal
 
1020
    @dbus.service.signal(_interface, signature="s")
 
1021
    def CheckerStarted(self, command):
 
1022
        "D-Bus signal"
 
1023
        pass
 
1024
    
 
1025
    # PropertyChanged - signal
 
1026
    @dbus.service.signal(_interface, signature="sv")
 
1027
    def PropertyChanged(self, property, value):
 
1028
        "D-Bus signal"
 
1029
        pass
 
1030
    
 
1031
    # GotSecret - signal
 
1032
    @dbus.service.signal(_interface)
 
1033
    def GotSecret(self):
 
1034
        """D-Bus signal
 
1035
        Is sent after a successful transfer of secret from the Mandos
 
1036
        server to mandos-client
 
1037
        """
 
1038
        pass
 
1039
    
 
1040
    # Rejected - signal
 
1041
    @dbus.service.signal(_interface, signature="s")
 
1042
    def Rejected(self, reason):
 
1043
        "D-Bus signal"
 
1044
        pass
 
1045
    
 
1046
    # NeedApproval - signal
 
1047
    @dbus.service.signal(_interface, signature="tb")
 
1048
    def NeedApproval(self, timeout, default):
 
1049
        "D-Bus signal"
 
1050
        return self.need_approval()
 
1051
    
 
1052
    ## Methods
 
1053
    
 
1054
    # Approve - method
 
1055
    @dbus.service.method(_interface, in_signature="b")
 
1056
    def Approve(self, value):
 
1057
        self.approve(value)
 
1058
    
 
1059
    # CheckedOK - method
 
1060
    @dbus.service.method(_interface)
 
1061
    def CheckedOK(self):
 
1062
        self.checked_ok()
 
1063
    
 
1064
    # Enable - method
 
1065
    @dbus.service.method(_interface)
 
1066
    def Enable(self):
 
1067
        "D-Bus method"
 
1068
        self.enable()
 
1069
    
 
1070
    # StartChecker - method
 
1071
    @dbus.service.method(_interface)
 
1072
    def StartChecker(self):
 
1073
        "D-Bus method"
 
1074
        self.start_checker()
 
1075
    
 
1076
    # Disable - method
 
1077
    @dbus.service.method(_interface)
 
1078
    def Disable(self):
 
1079
        "D-Bus method"
 
1080
        self.disable()
 
1081
    
 
1082
    # StopChecker - method
 
1083
    @dbus.service.method(_interface)
 
1084
    def StopChecker(self):
 
1085
        self.stop_checker()
 
1086
    
 
1087
    ## Properties
 
1088
    
 
1089
    # ApprovalPending - property
 
1090
    @dbus_service_property(_interface, signature="b", access="read")
 
1091
    def ApprovalPending_dbus_property(self):
 
1092
        return dbus.Boolean(bool(self.approvals_pending))
 
1093
    
 
1094
    # ApprovedByDefault - property
 
1095
    @dbus_service_property(_interface, signature="b",
 
1096
                           access="readwrite")
 
1097
    def ApprovedByDefault_dbus_property(self, value=None):
 
1098
        if value is None:       # get
 
1099
            return dbus.Boolean(self.approved_by_default)
 
1100
        self.approved_by_default = bool(value)
 
1101
    
 
1102
    # ApprovalDelay - property
 
1103
    @dbus_service_property(_interface, signature="t",
 
1104
                           access="readwrite")
 
1105
    def ApprovalDelay_dbus_property(self, value=None):
 
1106
        if value is None:       # get
 
1107
            return dbus.UInt64(self.approval_delay_milliseconds())
 
1108
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
1109
    
 
1110
    # ApprovalDuration - property
 
1111
    @dbus_service_property(_interface, signature="t",
 
1112
                           access="readwrite")
 
1113
    def ApprovalDuration_dbus_property(self, value=None):
 
1114
        if value is None:       # get
 
1115
            return dbus.UInt64(_timedelta_to_milliseconds(
 
1116
                    self.approval_duration))
 
1117
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
1118
    
 
1119
    # Name - property
 
1120
    @dbus_service_property(_interface, signature="s", access="read")
 
1121
    def Name_dbus_property(self):
 
1122
        return dbus.String(self.name)
 
1123
    
 
1124
    # Fingerprint - property
 
1125
    @dbus_service_property(_interface, signature="s", access="read")
 
1126
    def Fingerprint_dbus_property(self):
 
1127
        return dbus.String(self.fingerprint)
 
1128
    
 
1129
    # Host - property
 
1130
    @dbus_service_property(_interface, signature="s",
 
1131
                           access="readwrite")
 
1132
    def Host_dbus_property(self, value=None):
 
1133
        if value is None:       # get
 
1134
            return dbus.String(self.host)
 
1135
        self.host = value
 
1136
    
 
1137
    # Created - property
 
1138
    @dbus_service_property(_interface, signature="s", access="read")
 
1139
    def Created_dbus_property(self):
 
1140
        return dbus.String(datetime_to_dbus(self.created))
 
1141
    
 
1142
    # LastEnabled - property
 
1143
    @dbus_service_property(_interface, signature="s", access="read")
 
1144
    def LastEnabled_dbus_property(self):
 
1145
        return datetime_to_dbus(self.last_enabled)
 
1146
    
 
1147
    # Enabled - property
 
1148
    @dbus_service_property(_interface, signature="b",
 
1149
                           access="readwrite")
 
1150
    def Enabled_dbus_property(self, value=None):
 
1151
        if value is None:       # get
 
1152
            return dbus.Boolean(self.enabled)
 
1153
        if value:
 
1154
            self.enable()
 
1155
        else:
 
1156
            self.disable()
 
1157
    
 
1158
    # LastCheckedOK - property
 
1159
    @dbus_service_property(_interface, signature="s",
 
1160
                           access="readwrite")
 
1161
    def LastCheckedOK_dbus_property(self, value=None):
 
1162
        if value is not None:
 
1163
            self.checked_ok()
 
1164
            return
 
1165
        return datetime_to_dbus(self.last_checked_ok)
 
1166
    
 
1167
    # Expires - property
 
1168
    @dbus_service_property(_interface, signature="s", access="read")
 
1169
    def Expires_dbus_property(self):
 
1170
        return datetime_to_dbus(self.expires)
 
1171
    
 
1172
    # LastApprovalRequest - property
 
1173
    @dbus_service_property(_interface, signature="s", access="read")
 
1174
    def LastApprovalRequest_dbus_property(self):
 
1175
        return datetime_to_dbus(self.last_approval_request)
 
1176
    
 
1177
    # Timeout - property
 
1178
    @dbus_service_property(_interface, signature="t",
 
1179
                           access="readwrite")
 
1180
    def Timeout_dbus_property(self, value=None):
 
1181
        if value is None:       # get
 
1182
            return dbus.UInt64(self.timeout_milliseconds())
 
1183
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
1184
        if getattr(self, "disable_initiator_tag", None) is None:
 
1185
            return
 
1186
        # Reschedule timeout
 
1187
        gobject.source_remove(self.disable_initiator_tag)
 
1188
        self.disable_initiator_tag = None
 
1189
        self.expires = None
 
1190
        time_to_die = (self.
 
1191
                       _timedelta_to_milliseconds((self
 
1192
                                                   .last_checked_ok
 
1193
                                                   + self.timeout)
 
1194
                                                  - datetime.datetime
 
1195
                                                  .utcnow()))
 
1196
        if time_to_die <= 0:
 
1197
            # The timeout has passed
 
1198
            self.disable()
 
1199
        else:
 
1200
            self.expires = (datetime.datetime.utcnow()
 
1201
                            + datetime.timedelta(milliseconds =
 
1202
                                                 time_to_die))
 
1203
            self.disable_initiator_tag = (gobject.timeout_add
 
1204
                                          (time_to_die, self.disable))
 
1205
    
 
1206
    # ExtendedTimeout - property
 
1207
    @dbus_service_property(_interface, signature="t",
 
1208
                           access="readwrite")
 
1209
    def ExtendedTimeout_dbus_property(self, value=None):
 
1210
        if value is None:       # get
 
1211
            return dbus.UInt64(self.extended_timeout_milliseconds())
 
1212
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
 
1213
    
 
1214
    # Interval - property
 
1215
    @dbus_service_property(_interface, signature="t",
 
1216
                           access="readwrite")
 
1217
    def Interval_dbus_property(self, value=None):
 
1218
        if value is None:       # get
 
1219
            return dbus.UInt64(self.interval_milliseconds())
 
1220
        self.interval = datetime.timedelta(0, 0, 0, value)
 
1221
        if getattr(self, "checker_initiator_tag", None) is None:
 
1222
            return
 
1223
        # Reschedule checker run
 
1224
        gobject.source_remove(self.checker_initiator_tag)
 
1225
        self.checker_initiator_tag = (gobject.timeout_add
 
1226
                                      (value, self.start_checker))
 
1227
        self.start_checker()    # Start one now, too
 
1228
    
 
1229
    # Checker - property
 
1230
    @dbus_service_property(_interface, signature="s",
 
1231
                           access="readwrite")
 
1232
    def Checker_dbus_property(self, value=None):
 
1233
        if value is None:       # get
 
1234
            return dbus.String(self.checker_command)
 
1235
        self.checker_command = value
 
1236
    
 
1237
    # CheckerRunning - property
 
1238
    @dbus_service_property(_interface, signature="b",
 
1239
                           access="readwrite")
 
1240
    def CheckerRunning_dbus_property(self, value=None):
 
1241
        if value is None:       # get
 
1242
            return dbus.Boolean(self.checker is not None)
 
1243
        if value:
 
1244
            self.start_checker()
 
1245
        else:
 
1246
            self.stop_checker()
 
1247
    
 
1248
    # ObjectPath - property
 
1249
    @dbus_service_property(_interface, signature="o", access="read")
 
1250
    def ObjectPath_dbus_property(self):
 
1251
        return self.dbus_object_path # is already a dbus.ObjectPath
 
1252
    
 
1253
    # Secret = property
 
1254
    @dbus_service_property(_interface, signature="ay",
 
1255
                           access="write", byte_arrays=True)
 
1256
    def Secret_dbus_property(self, value):
 
1257
        self.secret = str(value)
 
1258
    
 
1259
    del _interface
 
1260
 
 
1261
 
 
1262
class ProxyClient(object):
 
1263
    def __init__(self, child_pipe, fpr, address):
 
1264
        self._pipe = child_pipe
 
1265
        self._pipe.send(('init', fpr, address))
 
1266
        if not self._pipe.recv():
 
1267
            raise KeyError()
 
1268
    
 
1269
    def __getattribute__(self, name):
 
1270
        if(name == '_pipe'):
 
1271
            return super(ProxyClient, self).__getattribute__(name)
 
1272
        self._pipe.send(('getattr', name))
 
1273
        data = self._pipe.recv()
 
1274
        if data[0] == 'data':
 
1275
            return data[1]
 
1276
        if data[0] == 'function':
 
1277
            def func(*args, **kwargs):
 
1278
                self._pipe.send(('funcall', name, args, kwargs))
 
1279
                return self._pipe.recv()[1]
 
1280
            return func
 
1281
    
 
1282
    def __setattr__(self, name, value):
 
1283
        if(name == '_pipe'):
 
1284
            return super(ProxyClient, self).__setattr__(name, value)
 
1285
        self._pipe.send(('setattr', name, value))
 
1286
 
 
1287
class ClientDBusTransitional(ClientDBus):
 
1288
    __metaclass__ = AlternateDBusNamesMetaclass
 
1289
 
 
1290
class ClientHandler(socketserver.BaseRequestHandler, object):
 
1291
    """A class to handle client connections.
 
1292
    
 
1293
    Instantiated once for each connection to handle it.
442
1294
    Note: This will run in its own forked process."""
443
1295
    
444
1296
    def handle(self):
445
 
        logger.info(u"TCP connection from: %s",
446
 
                     unicode(self.client_address))
447
 
        session = gnutls.connection.ClientSession\
448
 
                  (self.request, gnutls.connection.X509Credentials())
449
 
        
450
 
        line = self.request.makefile().readline()
451
 
        logger.debug(u"Protocol version: %r", line)
452
 
        try:
453
 
            if int(line.strip().split()[0]) > 1:
454
 
                raise RuntimeError
455
 
        except (ValueError, IndexError, RuntimeError), error:
456
 
            logger.error(u"Unknown protocol version: %s", error)
457
 
            return
458
 
        
459
 
        # Note: gnutls.connection.X509Credentials is really a generic
460
 
        # GnuTLS certificate credentials object so long as no X.509
461
 
        # keys are added to it.  Therefore, we can use it here despite
462
 
        # using OpenPGP certificates.
463
 
        
464
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
465
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
466
 
        #                "+DHE-DSS"))
467
 
        priority = "NORMAL"             # Fallback default, since this
468
 
                                        # MUST be set.
469
 
        if self.server.settings["priority"]:
470
 
            priority = self.server.settings["priority"]
471
 
        gnutls.library.functions.gnutls_priority_set_direct\
472
 
            (session._c_object, priority, None);
473
 
        
474
 
        try:
475
 
            session.handshake()
476
 
        except gnutls.errors.GNUTLSError, error:
477
 
            logger.warning(u"Handshake failed: %s", error)
478
 
            # Do not run session.bye() here: the session is not
479
 
            # established.  Just abandon the request.
480
 
            return
481
 
        try:
482
 
            fpr = fingerprint(peer_certificate(session))
483
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
484
 
            logger.warning(u"Bad certificate: %s", error)
485
 
            session.bye()
486
 
            return
487
 
        logger.debug(u"Fingerprint: %s", fpr)
488
 
        client = None
489
 
        for c in self.server.clients:
490
 
            if c.fingerprint == fpr:
491
 
                client = c
492
 
                break
493
 
        if not client:
494
 
            logger.warning(u"Client not found for fingerprint: %s",
495
 
                           fpr)
496
 
            session.bye()
497
 
            return
498
 
        # Have to check if client.still_valid(), since it is possible
499
 
        # that the client timed out while establishing the GnuTLS
500
 
        # session.
501
 
        if not client.still_valid():
502
 
            logger.warning(u"Client %(name)s is invalid",
503
 
                           vars(client))
504
 
            session.bye()
505
 
            return
506
 
        sent_size = 0
507
 
        while sent_size < len(client.secret):
508
 
            sent = session.send(client.secret[sent_size:])
509
 
            logger.debug(u"Sent: %d, remaining: %d",
510
 
                         sent, len(client.secret)
511
 
                         - (sent_size + sent))
512
 
            sent_size += sent
513
 
        session.bye()
514
 
 
515
 
 
516
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
517
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
1297
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
1298
            logger.info("TCP connection from: %s",
 
1299
                        unicode(self.client_address))
 
1300
            logger.debug("Pipe FD: %d",
 
1301
                         self.server.child_pipe.fileno())
 
1302
            
 
1303
            session = (gnutls.connection
 
1304
                       .ClientSession(self.request,
 
1305
                                      gnutls.connection
 
1306
                                      .X509Credentials()))
 
1307
            
 
1308
            # Note: gnutls.connection.X509Credentials is really a
 
1309
            # generic GnuTLS certificate credentials object so long as
 
1310
            # no X.509 keys are added to it.  Therefore, we can use it
 
1311
            # here despite using OpenPGP certificates.
 
1312
            
 
1313
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
 
1314
            #                      "+AES-256-CBC", "+SHA1",
 
1315
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
 
1316
            #                      "+DHE-DSS"))
 
1317
            # Use a fallback default, since this MUST be set.
 
1318
            priority = self.server.gnutls_priority
 
1319
            if priority is None:
 
1320
                priority = "NORMAL"
 
1321
            (gnutls.library.functions
 
1322
             .gnutls_priority_set_direct(session._c_object,
 
1323
                                         priority, None))
 
1324
            
 
1325
            # Start communication using the Mandos protocol
 
1326
            # Get protocol number
 
1327
            line = self.request.makefile().readline()
 
1328
            logger.debug("Protocol version: %r", line)
 
1329
            try:
 
1330
                if int(line.strip().split()[0]) > 1:
 
1331
                    raise RuntimeError
 
1332
            except (ValueError, IndexError, RuntimeError) as error:
 
1333
                logger.error("Unknown protocol version: %s", error)
 
1334
                return
 
1335
            
 
1336
            # Start GnuTLS connection
 
1337
            try:
 
1338
                session.handshake()
 
1339
            except gnutls.errors.GNUTLSError as error:
 
1340
                logger.warning("Handshake failed: %s", error)
 
1341
                # Do not run session.bye() here: the session is not
 
1342
                # established.  Just abandon the request.
 
1343
                return
 
1344
            logger.debug("Handshake succeeded")
 
1345
            
 
1346
            approval_required = False
 
1347
            try:
 
1348
                try:
 
1349
                    fpr = self.fingerprint(self.peer_certificate
 
1350
                                           (session))
 
1351
                except (TypeError,
 
1352
                        gnutls.errors.GNUTLSError) as error:
 
1353
                    logger.warning("Bad certificate: %s", error)
 
1354
                    return
 
1355
                logger.debug("Fingerprint: %s", fpr)
 
1356
                
 
1357
                try:
 
1358
                    client = ProxyClient(child_pipe, fpr,
 
1359
                                         self.client_address)
 
1360
                except KeyError:
 
1361
                    return
 
1362
                
 
1363
                if client.approval_delay:
 
1364
                    delay = client.approval_delay
 
1365
                    client.approvals_pending += 1
 
1366
                    approval_required = True
 
1367
                
 
1368
                while True:
 
1369
                    if not client.enabled:
 
1370
                        logger.info("Client %s is disabled",
 
1371
                                       client.name)
 
1372
                        if self.server.use_dbus:
 
1373
                            # Emit D-Bus signal
 
1374
                            client.Rejected("Disabled")
 
1375
                        return
 
1376
                    
 
1377
                    if client._approved or not client.approval_delay:
 
1378
                        #We are approved or approval is disabled
 
1379
                        break
 
1380
                    elif client._approved is None:
 
1381
                        logger.info("Client %s needs approval",
 
1382
                                    client.name)
 
1383
                        if self.server.use_dbus:
 
1384
                            # Emit D-Bus signal
 
1385
                            client.NeedApproval(
 
1386
                                client.approval_delay_milliseconds(),
 
1387
                                client.approved_by_default)
 
1388
                    else:
 
1389
                        logger.warning("Client %s was not approved",
 
1390
                                       client.name)
 
1391
                        if self.server.use_dbus:
 
1392
                            # Emit D-Bus signal
 
1393
                            client.Rejected("Denied")
 
1394
                        return
 
1395
                    
 
1396
                    #wait until timeout or approved
 
1397
                    time = datetime.datetime.now()
 
1398
                    client.changedstate.acquire()
 
1399
                    (client.changedstate.wait
 
1400
                     (float(client._timedelta_to_milliseconds(delay)
 
1401
                            / 1000)))
 
1402
                    client.changedstate.release()
 
1403
                    time2 = datetime.datetime.now()
 
1404
                    if (time2 - time) >= delay:
 
1405
                        if not client.approved_by_default:
 
1406
                            logger.warning("Client %s timed out while"
 
1407
                                           " waiting for approval",
 
1408
                                           client.name)
 
1409
                            if self.server.use_dbus:
 
1410
                                # Emit D-Bus signal
 
1411
                                client.Rejected("Approval timed out")
 
1412
                            return
 
1413
                        else:
 
1414
                            break
 
1415
                    else:
 
1416
                        delay -= time2 - time
 
1417
                
 
1418
                sent_size = 0
 
1419
                while sent_size < len(client.secret):
 
1420
                    try:
 
1421
                        sent = session.send(client.secret[sent_size:])
 
1422
                    except gnutls.errors.GNUTLSError as error:
 
1423
                        logger.warning("gnutls send failed")
 
1424
                        return
 
1425
                    logger.debug("Sent: %d, remaining: %d",
 
1426
                                 sent, len(client.secret)
 
1427
                                 - (sent_size + sent))
 
1428
                    sent_size += sent
 
1429
                
 
1430
                logger.info("Sending secret to %s", client.name)
 
1431
                # bump the timeout as if seen
 
1432
                client.checked_ok(client.extended_timeout)
 
1433
                if self.server.use_dbus:
 
1434
                    # Emit D-Bus signal
 
1435
                    client.GotSecret()
 
1436
            
 
1437
            finally:
 
1438
                if approval_required:
 
1439
                    client.approvals_pending -= 1
 
1440
                try:
 
1441
                    session.bye()
 
1442
                except gnutls.errors.GNUTLSError as error:
 
1443
                    logger.warning("GnuTLS bye failed")
 
1444
    
 
1445
    @staticmethod
 
1446
    def peer_certificate(session):
 
1447
        "Return the peer's OpenPGP certificate as a bytestring"
 
1448
        # If not an OpenPGP certificate...
 
1449
        if (gnutls.library.functions
 
1450
            .gnutls_certificate_type_get(session._c_object)
 
1451
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
1452
            # ...do the normal thing
 
1453
            return session.peer_certificate
 
1454
        list_size = ctypes.c_uint(1)
 
1455
        cert_list = (gnutls.library.functions
 
1456
                     .gnutls_certificate_get_peers
 
1457
                     (session._c_object, ctypes.byref(list_size)))
 
1458
        if not bool(cert_list) and list_size.value != 0:
 
1459
            raise gnutls.errors.GNUTLSError("error getting peer"
 
1460
                                            " certificate")
 
1461
        if list_size.value == 0:
 
1462
            return None
 
1463
        cert = cert_list[0]
 
1464
        return ctypes.string_at(cert.data, cert.size)
 
1465
    
 
1466
    @staticmethod
 
1467
    def fingerprint(openpgp):
 
1468
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
1469
        # New GnuTLS "datum" with the OpenPGP public key
 
1470
        datum = (gnutls.library.types
 
1471
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
1472
                                             ctypes.POINTER
 
1473
                                             (ctypes.c_ubyte)),
 
1474
                                 ctypes.c_uint(len(openpgp))))
 
1475
        # New empty GnuTLS certificate
 
1476
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
1477
        (gnutls.library.functions
 
1478
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
1479
        # Import the OpenPGP public key into the certificate
 
1480
        (gnutls.library.functions
 
1481
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
1482
                                    gnutls.library.constants
 
1483
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
1484
        # Verify the self signature in the key
 
1485
        crtverify = ctypes.c_uint()
 
1486
        (gnutls.library.functions
 
1487
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
1488
                                         ctypes.byref(crtverify)))
 
1489
        if crtverify.value != 0:
 
1490
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1491
            raise (gnutls.errors.CertificateSecurityError
 
1492
                   ("Verify failed"))
 
1493
        # New buffer for the fingerprint
 
1494
        buf = ctypes.create_string_buffer(20)
 
1495
        buf_len = ctypes.c_size_t()
 
1496
        # Get the fingerprint from the certificate into the buffer
 
1497
        (gnutls.library.functions
 
1498
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
1499
                                             ctypes.byref(buf_len)))
 
1500
        # Deinit the certificate
 
1501
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1502
        # Convert the buffer to a Python bytestring
 
1503
        fpr = ctypes.string_at(buf, buf_len.value)
 
1504
        # Convert the bytestring to hexadecimal notation
 
1505
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
 
1506
        return hex_fpr
 
1507
 
 
1508
 
 
1509
class MultiprocessingMixIn(object):
 
1510
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
1511
    def sub_process_main(self, request, address):
 
1512
        try:
 
1513
            self.finish_request(request, address)
 
1514
        except:
 
1515
            self.handle_error(request, address)
 
1516
        self.close_request(request)
 
1517
    
 
1518
    def process_request(self, request, address):
 
1519
        """Start a new process to process the request."""
 
1520
        proc = multiprocessing.Process(target = self.sub_process_main,
 
1521
                                       args = (request,
 
1522
                                               address))
 
1523
        proc.start()
 
1524
        return proc
 
1525
 
 
1526
 
 
1527
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
1528
    """ adds a pipe to the MixIn """
 
1529
    def process_request(self, request, client_address):
 
1530
        """Overrides and wraps the original process_request().
 
1531
        
 
1532
        This function creates a new pipe in self.pipe
 
1533
        """
 
1534
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
1535
        
 
1536
        proc = MultiprocessingMixIn.process_request(self, request,
 
1537
                                                    client_address)
 
1538
        self.child_pipe.close()
 
1539
        self.add_pipe(parent_pipe, proc)
 
1540
    
 
1541
    def add_pipe(self, parent_pipe, proc):
 
1542
        """Dummy function; override as necessary"""
 
1543
        raise NotImplementedError
 
1544
 
 
1545
 
 
1546
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
1547
                     socketserver.TCPServer, object):
 
1548
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
1549
    
518
1550
    Attributes:
519
 
        settings:       Server settings
520
 
        clients:        Set() of Client objects
521
1551
        enabled:        Boolean; whether this server is activated yet
 
1552
        interface:      None or a network interface name (string)
 
1553
        use_ipv6:       Boolean; to use IPv6 or not
522
1554
    """
523
 
    address_family = socket.AF_INET6
524
 
    def __init__(self, *args, **kwargs):
525
 
        if "settings" in kwargs:
526
 
            self.settings = kwargs["settings"]
527
 
            del kwargs["settings"]
528
 
        if "clients" in kwargs:
529
 
            self.clients = kwargs["clients"]
530
 
            del kwargs["clients"]
531
 
        self.enabled = False
532
 
        return super(type(self), self).__init__(*args, **kwargs)
 
1555
    def __init__(self, server_address, RequestHandlerClass,
 
1556
                 interface=None, use_ipv6=True):
 
1557
        self.interface = interface
 
1558
        if use_ipv6:
 
1559
            self.address_family = socket.AF_INET6
 
1560
        socketserver.TCPServer.__init__(self, server_address,
 
1561
                                        RequestHandlerClass)
533
1562
    def server_bind(self):
534
1563
        """This overrides the normal server_bind() function
535
1564
        to bind to an interface if one was specified, and also NOT to
536
1565
        bind to an address or port if they were not specified."""
537
 
        if self.settings["interface"]:
538
 
            # 25 is from /usr/include/asm-i486/socket.h
539
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
540
 
            try:
541
 
                self.socket.setsockopt(socket.SOL_SOCKET,
542
 
                                       SO_BINDTODEVICE,
543
 
                                       self.settings["interface"])
544
 
            except socket.error, error:
545
 
                if error[0] == errno.EPERM:
546
 
                    logger.error(u"No permission to"
547
 
                                 u" bind to interface %s",
548
 
                                 self.settings["interface"])
549
 
                else:
550
 
                    raise error
 
1566
        if self.interface is not None:
 
1567
            if SO_BINDTODEVICE is None:
 
1568
                logger.error("SO_BINDTODEVICE does not exist;"
 
1569
                             " cannot bind to interface %s",
 
1570
                             self.interface)
 
1571
            else:
 
1572
                try:
 
1573
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
1574
                                           SO_BINDTODEVICE,
 
1575
                                           str(self.interface
 
1576
                                               + '\0'))
 
1577
                except socket.error as error:
 
1578
                    if error[0] == errno.EPERM:
 
1579
                        logger.error("No permission to"
 
1580
                                     " bind to interface %s",
 
1581
                                     self.interface)
 
1582
                    elif error[0] == errno.ENOPROTOOPT:
 
1583
                        logger.error("SO_BINDTODEVICE not available;"
 
1584
                                     " cannot bind to interface %s",
 
1585
                                     self.interface)
 
1586
                    else:
 
1587
                        raise
551
1588
        # Only bind(2) the socket if we really need to.
552
1589
        if self.server_address[0] or self.server_address[1]:
553
1590
            if not self.server_address[0]:
554
 
                in6addr_any = "::"
555
 
                self.server_address = (in6addr_any,
 
1591
                if self.address_family == socket.AF_INET6:
 
1592
                    any_address = "::" # in6addr_any
 
1593
                else:
 
1594
                    any_address = socket.INADDR_ANY
 
1595
                self.server_address = (any_address,
556
1596
                                       self.server_address[1])
557
1597
            elif not self.server_address[1]:
558
1598
                self.server_address = (self.server_address[0],
559
1599
                                       0)
560
 
#                 if self.settings["interface"]:
 
1600
#                 if self.interface:
561
1601
#                     self.server_address = (self.server_address[0],
562
1602
#                                            0, # port
563
1603
#                                            0, # flowinfo
564
1604
#                                            if_nametoindex
565
 
#                                            (self.settings
566
 
#                                             ["interface"]))
567
 
            return super(type(self), self).server_bind()
 
1605
#                                            (self.interface))
 
1606
            return socketserver.TCPServer.server_bind(self)
 
1607
 
 
1608
 
 
1609
class MandosServer(IPv6_TCPServer):
 
1610
    """Mandos server.
 
1611
    
 
1612
    Attributes:
 
1613
        clients:        set of Client objects
 
1614
        gnutls_priority GnuTLS priority string
 
1615
        use_dbus:       Boolean; to emit D-Bus signals or not
 
1616
    
 
1617
    Assumes a gobject.MainLoop event loop.
 
1618
    """
 
1619
    def __init__(self, server_address, RequestHandlerClass,
 
1620
                 interface=None, use_ipv6=True, clients=None,
 
1621
                 gnutls_priority=None, use_dbus=True):
 
1622
        self.enabled = False
 
1623
        self.clients = clients
 
1624
        if self.clients is None:
 
1625
            self.clients = set()
 
1626
        self.use_dbus = use_dbus
 
1627
        self.gnutls_priority = gnutls_priority
 
1628
        IPv6_TCPServer.__init__(self, server_address,
 
1629
                                RequestHandlerClass,
 
1630
                                interface = interface,
 
1631
                                use_ipv6 = use_ipv6)
568
1632
    def server_activate(self):
569
1633
        if self.enabled:
570
 
            return super(type(self), self).server_activate()
 
1634
            return socketserver.TCPServer.server_activate(self)
 
1635
    
571
1636
    def enable(self):
572
1637
        self.enabled = True
 
1638
    
 
1639
    def add_pipe(self, parent_pipe, proc):
 
1640
        # Call "handle_ipc" for both data and EOF events
 
1641
        gobject.io_add_watch(parent_pipe.fileno(),
 
1642
                             gobject.IO_IN | gobject.IO_HUP,
 
1643
                             functools.partial(self.handle_ipc,
 
1644
                                               parent_pipe =
 
1645
                                               parent_pipe,
 
1646
                                               proc = proc))
 
1647
    
 
1648
    def handle_ipc(self, source, condition, parent_pipe=None,
 
1649
                   proc = None, client_object=None):
 
1650
        condition_names = {
 
1651
            gobject.IO_IN: "IN",   # There is data to read.
 
1652
            gobject.IO_OUT: "OUT", # Data can be written (without
 
1653
                                    # blocking).
 
1654
            gobject.IO_PRI: "PRI", # There is urgent data to read.
 
1655
            gobject.IO_ERR: "ERR", # Error condition.
 
1656
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
 
1657
                                    # broken, usually for pipes and
 
1658
                                    # sockets).
 
1659
            }
 
1660
        conditions_string = ' | '.join(name
 
1661
                                       for cond, name in
 
1662
                                       condition_names.iteritems()
 
1663
                                       if cond & condition)
 
1664
        # error or the other end of multiprocessing.Pipe has closed
 
1665
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
 
1666
            proc.join()
 
1667
            return False
 
1668
        
 
1669
        # Read a request from the child
 
1670
        request = parent_pipe.recv()
 
1671
        command = request[0]
 
1672
        
 
1673
        if command == 'init':
 
1674
            fpr = request[1]
 
1675
            address = request[2]
 
1676
            
 
1677
            for c in self.clients:
 
1678
                if c.fingerprint == fpr:
 
1679
                    client = c
 
1680
                    break
 
1681
            else:
 
1682
                logger.info("Client not found for fingerprint: %s, ad"
 
1683
                            "dress: %s", fpr, address)
 
1684
                if self.use_dbus:
 
1685
                    # Emit D-Bus signal
 
1686
                    mandos_dbus_service.ClientNotFound(fpr,
 
1687
                                                       address[0])
 
1688
                parent_pipe.send(False)
 
1689
                return False
 
1690
            
 
1691
            gobject.io_add_watch(parent_pipe.fileno(),
 
1692
                                 gobject.IO_IN | gobject.IO_HUP,
 
1693
                                 functools.partial(self.handle_ipc,
 
1694
                                                   parent_pipe =
 
1695
                                                   parent_pipe,
 
1696
                                                   proc = proc,
 
1697
                                                   client_object =
 
1698
                                                   client))
 
1699
            parent_pipe.send(True)
 
1700
            # remove the old hook in favor of the new above hook on
 
1701
            # same fileno
 
1702
            return False
 
1703
        if command == 'funcall':
 
1704
            funcname = request[1]
 
1705
            args = request[2]
 
1706
            kwargs = request[3]
 
1707
            
 
1708
            parent_pipe.send(('data', getattr(client_object,
 
1709
                                              funcname)(*args,
 
1710
                                                         **kwargs)))
 
1711
        
 
1712
        if command == 'getattr':
 
1713
            attrname = request[1]
 
1714
            if callable(client_object.__getattribute__(attrname)):
 
1715
                parent_pipe.send(('function',))
 
1716
            else:
 
1717
                parent_pipe.send(('data', client_object
 
1718
                                  .__getattribute__(attrname)))
 
1719
        
 
1720
        if command == 'setattr':
 
1721
            attrname = request[1]
 
1722
            value = request[2]
 
1723
            setattr(client_object, attrname, value)
 
1724
        
 
1725
        return True
573
1726
 
574
1727
 
575
1728
def string_to_delta(interval):
576
1729
    """Parse a string and return a datetime.timedelta
577
 
 
 
1730
    
578
1731
    >>> string_to_delta('7d')
579
1732
    datetime.timedelta(7)
580
1733
    >>> string_to_delta('60s')
583
1736
    datetime.timedelta(0, 3600)
584
1737
    >>> string_to_delta('24h')
585
1738
    datetime.timedelta(1)
586
 
    >>> string_to_delta(u'1w')
 
1739
    >>> string_to_delta('1w')
587
1740
    datetime.timedelta(7)
588
1741
    >>> string_to_delta('5m 30s')
589
1742
    datetime.timedelta(0, 330)
591
1744
    timevalue = datetime.timedelta(0)
592
1745
    for s in interval.split():
593
1746
        try:
594
 
            suffix=unicode(s[-1])
595
 
            value=int(s[:-1])
596
 
            if suffix == u"d":
 
1747
            suffix = unicode(s[-1])
 
1748
            value = int(s[:-1])
 
1749
            if suffix == "d":
597
1750
                delta = datetime.timedelta(value)
598
 
            elif suffix == u"s":
 
1751
            elif suffix == "s":
599
1752
                delta = datetime.timedelta(0, value)
600
 
            elif suffix == u"m":
 
1753
            elif suffix == "m":
601
1754
                delta = datetime.timedelta(0, 0, 0, 0, value)
602
 
            elif suffix == u"h":
 
1755
            elif suffix == "h":
603
1756
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
604
 
            elif suffix == u"w":
 
1757
            elif suffix == "w":
605
1758
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
606
1759
            else:
607
 
                raise ValueError
608
 
        except (ValueError, IndexError):
609
 
            raise ValueError
 
1760
                raise ValueError("Unknown suffix %r" % suffix)
 
1761
        except (ValueError, IndexError) as e:
 
1762
            raise ValueError(*(e.args))
610
1763
        timevalue += delta
611
1764
    return timevalue
612
1765
 
613
1766
 
614
 
def server_state_changed(state):
615
 
    """Derived from the Avahi example code"""
616
 
    if state == avahi.SERVER_COLLISION:
617
 
        logger.error(u"Zeroconf server name collision")
618
 
        service.remove()
619
 
    elif state == avahi.SERVER_RUNNING:
620
 
        service.add()
621
 
 
622
 
 
623
 
def entry_group_state_changed(state, error):
624
 
    """Derived from the Avahi example code"""
625
 
    logger.debug(u"Avahi state change: %i", state)
626
 
    
627
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
628
 
        logger.debug(u"Zeroconf service established.")
629
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
630
 
        logger.warning(u"Zeroconf service name collision.")
631
 
        service.rename()
632
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
633
 
        logger.critical(u"Avahi: Error in group state changed %s",
634
 
                        unicode(error))
635
 
        raise AvahiGroupError("State changed: %s", str(error))
636
 
 
637
1767
def if_nametoindex(interface):
638
 
    """Call the C function if_nametoindex(), or equivalent"""
 
1768
    """Call the C function if_nametoindex(), or equivalent
 
1769
    
 
1770
    Note: This function cannot accept a unicode string."""
639
1771
    global if_nametoindex
640
1772
    try:
641
 
        if "ctypes.util" not in sys.modules:
642
 
            import ctypes.util
643
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
644
 
            (ctypes.util.find_library("c")).if_nametoindex
 
1773
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1774
                          (ctypes.util.find_library("c"))
 
1775
                          .if_nametoindex)
645
1776
    except (OSError, AttributeError):
646
 
        if "struct" not in sys.modules:
647
 
            import struct
648
 
        if "fcntl" not in sys.modules:
649
 
            import fcntl
 
1777
        logger.warning("Doing if_nametoindex the hard way")
650
1778
        def if_nametoindex(interface):
651
1779
            "Get an interface index the hard way, i.e. using fcntl()"
652
1780
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
653
 
            s = socket.socket()
654
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
655
 
                                struct.pack("16s16x", interface))
656
 
            s.close()
657
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
1781
            with contextlib.closing(socket.socket()) as s:
 
1782
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1783
                                    struct.pack(str("16s16x"),
 
1784
                                                interface))
 
1785
            interface_index = struct.unpack(str("I"),
 
1786
                                            ifreq[16:20])[0]
658
1787
            return interface_index
659
1788
    return if_nametoindex(interface)
660
1789
 
661
1790
 
662
1791
def daemon(nochdir = False, noclose = False):
663
1792
    """See daemon(3).  Standard BSD Unix function.
 
1793
    
664
1794
    This should really exist as os.daemon, but it doesn't (yet)."""
665
1795
    if os.fork():
666
1796
        sys.exit()
674
1804
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
675
1805
        if not stat.S_ISCHR(os.fstat(null).st_mode):
676
1806
            raise OSError(errno.ENODEV,
677
 
                          "/dev/null not a character device")
 
1807
                          "%s not a character device"
 
1808
                          % os.path.devnull)
678
1809
        os.dup2(null, sys.stdin.fileno())
679
1810
        os.dup2(null, sys.stdout.fileno())
680
1811
        os.dup2(null, sys.stderr.fileno())
683
1814
 
684
1815
 
685
1816
def main():
686
 
    global main_loop_started
687
 
    main_loop_started = False
688
 
    
689
 
    parser = OptionParser(version = "%%prog %s" % version)
690
 
    parser.add_option("-i", "--interface", type="string",
691
 
                      metavar="IF", help="Bind to interface IF")
692
 
    parser.add_option("-a", "--address", type="string",
693
 
                      help="Address to listen for requests on")
694
 
    parser.add_option("-p", "--port", type="int",
695
 
                      help="Port number to receive requests on")
696
 
    parser.add_option("--check", action="store_true", default=False,
697
 
                      help="Run self-test")
698
 
    parser.add_option("--debug", action="store_true",
699
 
                      help="Debug mode; run in foreground and log to"
700
 
                      " terminal")
701
 
    parser.add_option("--priority", type="string", help="GnuTLS"
702
 
                      " priority string (see GnuTLS documentation)")
703
 
    parser.add_option("--servicename", type="string", metavar="NAME",
704
 
                      help="Zeroconf service name")
705
 
    parser.add_option("--configdir", type="string",
706
 
                      default="/etc/mandos", metavar="DIR",
707
 
                      help="Directory to search for configuration"
708
 
                      " files")
709
 
    (options, args) = parser.parse_args()
 
1817
    
 
1818
    ##################################################################
 
1819
    # Parsing of options, both command line and config file
 
1820
    
 
1821
    parser = argparse.ArgumentParser()
 
1822
    parser.add_argument("-v", "--version", action="version",
 
1823
                        version = "%%(prog)s %s" % version,
 
1824
                        help="show version number and exit")
 
1825
    parser.add_argument("-i", "--interface", metavar="IF",
 
1826
                        help="Bind to interface IF")
 
1827
    parser.add_argument("-a", "--address",
 
1828
                        help="Address to listen for requests on")
 
1829
    parser.add_argument("-p", "--port", type=int,
 
1830
                        help="Port number to receive requests on")
 
1831
    parser.add_argument("--check", action="store_true",
 
1832
                        help="Run self-test")
 
1833
    parser.add_argument("--debug", action="store_true",
 
1834
                        help="Debug mode; run in foreground and log"
 
1835
                        " to terminal")
 
1836
    parser.add_argument("--debuglevel", metavar="LEVEL",
 
1837
                        help="Debug level for stdout output")
 
1838
    parser.add_argument("--priority", help="GnuTLS"
 
1839
                        " priority string (see GnuTLS documentation)")
 
1840
    parser.add_argument("--servicename",
 
1841
                        metavar="NAME", help="Zeroconf service name")
 
1842
    parser.add_argument("--configdir",
 
1843
                        default="/etc/mandos", metavar="DIR",
 
1844
                        help="Directory to search for configuration"
 
1845
                        " files")
 
1846
    parser.add_argument("--no-dbus", action="store_false",
 
1847
                        dest="use_dbus", help="Do not provide D-Bus"
 
1848
                        " system bus interface")
 
1849
    parser.add_argument("--no-ipv6", action="store_false",
 
1850
                        dest="use_ipv6", help="Do not use IPv6")
 
1851
    options = parser.parse_args()
710
1852
    
711
1853
    if options.check:
712
1854
        import doctest
721
1863
                        "priority":
722
1864
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
723
1865
                        "servicename": "Mandos",
 
1866
                        "use_dbus": "True",
 
1867
                        "use_ipv6": "True",
 
1868
                        "debuglevel": "",
724
1869
                        }
725
1870
    
726
1871
    # Parse config file for server-global settings
727
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
1872
    server_config = configparser.SafeConfigParser(server_defaults)
728
1873
    del server_defaults
729
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
1874
    server_config.read(os.path.join(options.configdir,
 
1875
                                    "mandos.conf"))
730
1876
    # Convert the SafeConfigParser object to a dict
731
1877
    server_settings = server_config.defaults()
732
 
    # Use getboolean on the boolean config option
733
 
    server_settings["debug"] = server_config.getboolean\
734
 
                               ("DEFAULT", "debug")
 
1878
    # Use the appropriate methods on the non-string config options
 
1879
    for option in ("debug", "use_dbus", "use_ipv6"):
 
1880
        server_settings[option] = server_config.getboolean("DEFAULT",
 
1881
                                                           option)
 
1882
    if server_settings["port"]:
 
1883
        server_settings["port"] = server_config.getint("DEFAULT",
 
1884
                                                       "port")
735
1885
    del server_config
736
1886
    
737
1887
    # Override the settings from the config file with command line
738
1888
    # options, if set.
739
1889
    for option in ("interface", "address", "port", "debug",
740
 
                   "priority", "servicename", "configdir"):
 
1890
                   "priority", "servicename", "configdir",
 
1891
                   "use_dbus", "use_ipv6", "debuglevel"):
741
1892
        value = getattr(options, option)
742
1893
        if value is not None:
743
1894
            server_settings[option] = value
744
1895
    del options
 
1896
    # Force all strings to be unicode
 
1897
    for option in server_settings.keys():
 
1898
        if type(server_settings[option]) is str:
 
1899
            server_settings[option] = unicode(server_settings[option])
745
1900
    # Now we have our good server settings in "server_settings"
746
1901
    
 
1902
    ##################################################################
 
1903
    
 
1904
    # For convenience
747
1905
    debug = server_settings["debug"]
748
 
    
749
 
    if not debug:
750
 
        syslogger.setLevel(logging.WARNING)
751
 
        console.setLevel(logging.WARNING)
 
1906
    debuglevel = server_settings["debuglevel"]
 
1907
    use_dbus = server_settings["use_dbus"]
 
1908
    use_ipv6 = server_settings["use_ipv6"]
752
1909
    
753
1910
    if server_settings["servicename"] != "Mandos":
754
 
        syslogger.setFormatter(logging.Formatter\
755
 
                               ('Mandos (%s): %%(levelname)s:'
756
 
                                ' %%(message)s'
 
1911
        syslogger.setFormatter(logging.Formatter
 
1912
                               ('Mandos (%s) [%%(process)d]:'
 
1913
                                ' %%(levelname)s: %%(message)s'
757
1914
                                % server_settings["servicename"]))
758
1915
    
759
1916
    # Parse config file with clients
760
 
    client_defaults = { "timeout": "1h",
761
 
                        "interval": "5m",
762
 
                        "checker": "fping -q -- %(host)s",
 
1917
    client_defaults = { "timeout": "5m",
 
1918
                        "extended_timeout": "15m",
 
1919
                        "interval": "2m",
 
1920
                        "checker": "fping -q -- %%(host)s",
763
1921
                        "host": "",
 
1922
                        "approval_delay": "0s",
 
1923
                        "approval_duration": "1s",
764
1924
                        }
765
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
1925
    client_config = configparser.SafeConfigParser(client_defaults)
766
1926
    client_config.read(os.path.join(server_settings["configdir"],
767
1927
                                    "clients.conf"))
768
1928
    
769
 
    clients = Set()
770
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
771
 
                                 server_settings["port"]),
772
 
                                tcp_handler,
773
 
                                settings=server_settings,
774
 
                                clients=clients)
775
 
    uid = 65534
776
 
    gid = 65534
777
 
    try:
778
 
        uid = pwd.getpwnam("mandos").pw_uid
779
 
    except KeyError:
780
 
        try:
781
 
            uid = pwd.getpwnam("nobody").pw_uid
782
 
        except KeyError:
783
 
            pass
784
 
    try:
785
 
        gid = pwd.getpwnam("mandos").pw_gid
786
 
    except KeyError:
787
 
        try:
788
 
            gid = pwd.getpwnam("nogroup").pw_gid
789
 
        except KeyError:
790
 
            pass
791
 
    try:
 
1929
    global mandos_dbus_service
 
1930
    mandos_dbus_service = None
 
1931
    
 
1932
    tcp_server = MandosServer((server_settings["address"],
 
1933
                               server_settings["port"]),
 
1934
                              ClientHandler,
 
1935
                              interface=(server_settings["interface"]
 
1936
                                         or None),
 
1937
                              use_ipv6=use_ipv6,
 
1938
                              gnutls_priority=
 
1939
                              server_settings["priority"],
 
1940
                              use_dbus=use_dbus)
 
1941
    if not debug:
 
1942
        pidfilename = "/var/run/mandos.pid"
 
1943
        try:
 
1944
            pidfile = open(pidfilename, "w")
 
1945
        except IOError:
 
1946
            logger.error("Could not open file %r", pidfilename)
 
1947
    
 
1948
    try:
 
1949
        uid = pwd.getpwnam("_mandos").pw_uid
 
1950
        gid = pwd.getpwnam("_mandos").pw_gid
 
1951
    except KeyError:
 
1952
        try:
 
1953
            uid = pwd.getpwnam("mandos").pw_uid
 
1954
            gid = pwd.getpwnam("mandos").pw_gid
 
1955
        except KeyError:
 
1956
            try:
 
1957
                uid = pwd.getpwnam("nobody").pw_uid
 
1958
                gid = pwd.getpwnam("nobody").pw_gid
 
1959
            except KeyError:
 
1960
                uid = 65534
 
1961
                gid = 65534
 
1962
    try:
 
1963
        os.setgid(gid)
792
1964
        os.setuid(uid)
793
 
        os.setgid(gid)
794
 
    except OSError, error:
 
1965
    except OSError as error:
795
1966
        if error[0] != errno.EPERM:
796
1967
            raise error
797
 
 
798
 
    global service
799
 
    service = AvahiService(name = server_settings["servicename"],
800
 
                           type = "_mandos._tcp", );
801
 
    if server_settings["interface"]:
802
 
        service.interface = if_nametoindex\
803
 
                            (server_settings["interface"])
804
 
    
805
 
    global main_loop
806
 
    global bus
807
 
    global server
808
 
    # From the Avahi example code
809
 
    DBusGMainLoop(set_as_default=True )
810
 
    main_loop = gobject.MainLoop()
811
 
    bus = dbus.SystemBus()
812
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
813
 
                                           avahi.DBUS_PATH_SERVER),
814
 
                            avahi.DBUS_INTERFACE_SERVER)
815
 
    # End of Avahi example code
816
 
    
817
 
    def remove_from_clients(client):
818
 
        clients.remove(client)
819
 
        if not clients:
820
 
            logger.critical(u"No clients left, exiting")
821
 
            sys.exit()
822
 
    
823
 
    clients.update(Set(Client(name = section,
824
 
                              stop_hook = remove_from_clients,
825
 
                              config
826
 
                              = dict(client_config.items(section)))
827
 
                       for section in client_config.sections()))
828
 
    if not clients:
829
 
        logger.critical(u"No clients defined")
830
 
        sys.exit(1)
 
1968
    
 
1969
    if not debug and not debuglevel:
 
1970
        syslogger.setLevel(logging.WARNING)
 
1971
        console.setLevel(logging.WARNING)
 
1972
    if debuglevel:
 
1973
        level = getattr(logging, debuglevel.upper())
 
1974
        syslogger.setLevel(level)
 
1975
        console.setLevel(level)
831
1976
    
832
1977
    if debug:
 
1978
        # Enable all possible GnuTLS debugging
 
1979
        
 
1980
        # "Use a log level over 10 to enable all debugging options."
 
1981
        # - GnuTLS manual
 
1982
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1983
        
 
1984
        @gnutls.library.types.gnutls_log_func
 
1985
        def debug_gnutls(level, string):
 
1986
            logger.debug("GnuTLS: %s", string[:-1])
 
1987
        
 
1988
        (gnutls.library.functions
 
1989
         .gnutls_global_set_log_function(debug_gnutls))
 
1990
        
833
1991
        # Redirect stdin so all checkers get /dev/null
834
1992
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
835
1993
        os.dup2(null, sys.stdin.fileno())
838
1996
    else:
839
1997
        # No console logging
840
1998
        logger.removeHandler(console)
 
1999
    
 
2000
    # Need to fork before connecting to D-Bus
 
2001
    if not debug:
841
2002
        # Close all input and output, do double fork, etc.
842
2003
        daemon()
843
2004
    
844
 
    pidfilename = "/var/run/mandos.pid"
845
 
    pid = os.getpid()
846
 
    try:
847
 
        pidfile = open(pidfilename, "w")
848
 
        pidfile.write(str(pid) + "\n")
849
 
        pidfile.close()
850
 
        del pidfile
851
 
    except IOError, err:
852
 
        logger.error(u"Could not write %s file with PID %d",
853
 
                     pidfilename, os.getpid())
 
2005
    global main_loop
 
2006
    # From the Avahi example code
 
2007
    DBusGMainLoop(set_as_default=True )
 
2008
    main_loop = gobject.MainLoop()
 
2009
    bus = dbus.SystemBus()
 
2010
    # End of Avahi example code
 
2011
    if use_dbus:
 
2012
        try:
 
2013
            bus_name = dbus.service.BusName("se.recompile.Mandos",
 
2014
                                            bus, do_not_queue=True)
 
2015
            old_bus_name = (dbus.service.BusName
 
2016
                            ("se.bsnet.fukt.Mandos", bus,
 
2017
                             do_not_queue=True))
 
2018
        except dbus.exceptions.NameExistsException as e:
 
2019
            logger.error(unicode(e) + ", disabling D-Bus")
 
2020
            use_dbus = False
 
2021
            server_settings["use_dbus"] = False
 
2022
            tcp_server.use_dbus = False
 
2023
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
2024
    service = AvahiService(name = server_settings["servicename"],
 
2025
                           servicetype = "_mandos._tcp",
 
2026
                           protocol = protocol, bus = bus)
 
2027
    if server_settings["interface"]:
 
2028
        service.interface = (if_nametoindex
 
2029
                             (str(server_settings["interface"])))
 
2030
    
 
2031
    global multiprocessing_manager
 
2032
    multiprocessing_manager = multiprocessing.Manager()
 
2033
    
 
2034
    client_class = Client
 
2035
    if use_dbus:
 
2036
        client_class = functools.partial(ClientDBusTransitional,
 
2037
                                         bus = bus)
 
2038
    def client_config_items(config, section):
 
2039
        special_settings = {
 
2040
            "approved_by_default":
 
2041
                lambda: config.getboolean(section,
 
2042
                                          "approved_by_default"),
 
2043
            }
 
2044
        for name, value in config.items(section):
 
2045
            try:
 
2046
                yield (name, special_settings[name]())
 
2047
            except KeyError:
 
2048
                yield (name, value)
 
2049
    
 
2050
    tcp_server.clients.update(set(
 
2051
            client_class(name = section,
 
2052
                         config= dict(client_config_items(
 
2053
                        client_config, section)))
 
2054
            for section in client_config.sections()))
 
2055
    if not tcp_server.clients:
 
2056
        logger.warning("No clients defined")
 
2057
        
 
2058
    if not debug:
 
2059
        try:
 
2060
            with pidfile:
 
2061
                pid = os.getpid()
 
2062
                pidfile.write(str(pid) + "\n".encode("utf-8"))
 
2063
            del pidfile
 
2064
        except IOError:
 
2065
            logger.error("Could not write to file %r with PID %d",
 
2066
                         pidfilename, pid)
 
2067
        except NameError:
 
2068
            # "pidfile" was never created
 
2069
            pass
 
2070
        del pidfilename
 
2071
        
 
2072
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
2073
    
 
2074
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
2075
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
2076
    
 
2077
    if use_dbus:
 
2078
        class MandosDBusService(dbus.service.Object):
 
2079
            """A D-Bus proxy object"""
 
2080
            def __init__(self):
 
2081
                dbus.service.Object.__init__(self, bus, "/")
 
2082
            _interface = "se.recompile.Mandos"
 
2083
            
 
2084
            @dbus.service.signal(_interface, signature="o")
 
2085
            def ClientAdded(self, objpath):
 
2086
                "D-Bus signal"
 
2087
                pass
 
2088
            
 
2089
            @dbus.service.signal(_interface, signature="ss")
 
2090
            def ClientNotFound(self, fingerprint, address):
 
2091
                "D-Bus signal"
 
2092
                pass
 
2093
            
 
2094
            @dbus.service.signal(_interface, signature="os")
 
2095
            def ClientRemoved(self, objpath, name):
 
2096
                "D-Bus signal"
 
2097
                pass
 
2098
            
 
2099
            @dbus.service.method(_interface, out_signature="ao")
 
2100
            def GetAllClients(self):
 
2101
                "D-Bus method"
 
2102
                return dbus.Array(c.dbus_object_path
 
2103
                                  for c in tcp_server.clients)
 
2104
            
 
2105
            @dbus.service.method(_interface,
 
2106
                                 out_signature="a{oa{sv}}")
 
2107
            def GetAllClientsWithProperties(self):
 
2108
                "D-Bus method"
 
2109
                return dbus.Dictionary(
 
2110
                    ((c.dbus_object_path, c.GetAll(""))
 
2111
                     for c in tcp_server.clients),
 
2112
                    signature="oa{sv}")
 
2113
            
 
2114
            @dbus.service.method(_interface, in_signature="o")
 
2115
            def RemoveClient(self, object_path):
 
2116
                "D-Bus method"
 
2117
                for c in tcp_server.clients:
 
2118
                    if c.dbus_object_path == object_path:
 
2119
                        tcp_server.clients.remove(c)
 
2120
                        c.remove_from_connection()
 
2121
                        # Don't signal anything except ClientRemoved
 
2122
                        c.disable(quiet=True)
 
2123
                        # Emit D-Bus signal
 
2124
                        self.ClientRemoved(object_path, c.name)
 
2125
                        return
 
2126
                raise KeyError(object_path)
 
2127
            
 
2128
            del _interface
 
2129
        
 
2130
        class MandosDBusServiceTransitional(MandosDBusService):
 
2131
            __metaclass__ = AlternateDBusNamesMetaclass
 
2132
        mandos_dbus_service = MandosDBusServiceTransitional()
854
2133
    
855
2134
    def cleanup():
856
2135
        "Cleanup function; run on exit"
857
 
        global group
858
 
        # From the Avahi example code
859
 
        if not group is None:
860
 
            group.Free()
861
 
            group = None
862
 
        # End of Avahi example code
 
2136
        service.cleanup()
863
2137
        
864
 
        while clients:
865
 
            client = clients.pop()
866
 
            client.stop_hook = None
867
 
            client.stop()
 
2138
        multiprocessing.active_children()
 
2139
        while tcp_server.clients:
 
2140
            client = tcp_server.clients.pop()
 
2141
            if use_dbus:
 
2142
                client.remove_from_connection()
 
2143
            client.disable_hook = None
 
2144
            # Don't signal anything except ClientRemoved
 
2145
            client.disable(quiet=True)
 
2146
            if use_dbus:
 
2147
                # Emit D-Bus signal
 
2148
                mandos_dbus_service.ClientRemoved(client
 
2149
                                                  .dbus_object_path,
 
2150
                                                  client.name)
868
2151
    
869
2152
    atexit.register(cleanup)
870
2153
    
871
 
    if not debug:
872
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
873
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
874
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
875
 
    
876
 
    for client in clients:
877
 
        client.start()
 
2154
    for client in tcp_server.clients:
 
2155
        if use_dbus:
 
2156
            # Emit D-Bus signal
 
2157
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
 
2158
        client.enable()
878
2159
    
879
2160
    tcp_server.enable()
880
2161
    tcp_server.server_activate()
881
2162
    
882
2163
    # Find out what port we got
883
2164
    service.port = tcp_server.socket.getsockname()[1]
884
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
885
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
2165
    if use_ipv6:
 
2166
        logger.info("Now listening on address %r, port %d,"
 
2167
                    " flowinfo %d, scope_id %d"
 
2168
                    % tcp_server.socket.getsockname())
 
2169
    else:                       # IPv4
 
2170
        logger.info("Now listening on address %r, port %d"
 
2171
                    % tcp_server.socket.getsockname())
886
2172
    
887
2173
    #service.interface = tcp_server.socket.getsockname()[3]
888
2174
    
889
2175
    try:
890
2176
        # From the Avahi example code
891
 
        server.connect_to_signal("StateChanged", server_state_changed)
892
2177
        try:
893
 
            server_state_changed(server.GetState())
894
 
        except dbus.exceptions.DBusException, error:
895
 
            logger.critical(u"DBusException: %s", error)
 
2178
            service.activate()
 
2179
        except dbus.exceptions.DBusException as error:
 
2180
            logger.critical("DBusException: %s", error)
 
2181
            cleanup()
896
2182
            sys.exit(1)
897
2183
        # End of Avahi example code
898
2184
        
899
2185
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
900
2186
                             lambda *args, **kwargs:
901
 
                             tcp_server.handle_request\
902
 
                             (*args[2:], **kwargs) or True)
 
2187
                             (tcp_server.handle_request
 
2188
                              (*args[2:], **kwargs) or True))
903
2189
        
904
 
        logger.debug(u"Starting main loop")
905
 
        main_loop_started = True
 
2190
        logger.debug("Starting main loop")
906
2191
        main_loop.run()
907
 
    except AvahiError, error:
908
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
2192
    except AvahiError as error:
 
2193
        logger.critical("AvahiError: %s", error)
 
2194
        cleanup()
909
2195
        sys.exit(1)
910
2196
    except KeyboardInterrupt:
911
2197
        if debug:
912
 
            print
 
2198
            print("", file=sys.stderr)
 
2199
        logger.debug("Server received KeyboardInterrupt")
 
2200
    logger.debug("Server exiting")
 
2201
    # Must run before the D-Bus bus name gets deregistered
 
2202
    cleanup()
 
2203
 
913
2204
 
914
2205
if __name__ == '__main__':
915
2206
    main()