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* mandos-ctl: Made work again after D-Bus API changes.
  (datetime_to_milliseconds): Renamed to "timedelta_to_milliseconds".
                              All callers changed.
  (milliseconds_to_string): Use clearer mapping string format.
  (string_to_delta): Add some comments.

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Lines of Context:
mandos
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
 
9
# methods "add", "remove", "server_state_changed",
 
10
# "entry_group_state_changed", "cleanup", and "activate" in the
 
11
# "AvahiService" class, and some lines in "main".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
14
# Copyright © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
15
16
# 
16
17
# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
30
31
# Contact the authors at <mandos@fukt.bsnet.se>.
31
32
# 
32
33
 
33
 
from __future__ import division
 
34
from __future__ import division, with_statement, absolute_import
34
35
 
35
 
import SocketServer
 
36
import SocketServer as socketserver
36
37
import socket
37
 
import select
38
 
from optparse import OptionParser
 
38
import optparse
39
39
import datetime
40
40
import errno
41
41
import gnutls.crypto
44
44
import gnutls.library.functions
45
45
import gnutls.library.constants
46
46
import gnutls.library.types
47
 
import ConfigParser
 
47
import ConfigParser as configparser
48
48
import sys
49
49
import re
50
50
import os
51
51
import signal
52
 
from sets import Set
53
52
import subprocess
54
53
import atexit
55
54
import stat
56
55
import logging
57
56
import logging.handlers
58
57
import pwd
 
58
from contextlib import closing
 
59
import struct
 
60
import fcntl
 
61
import functools
59
62
 
60
63
import dbus
 
64
import dbus.service
61
65
import gobject
62
66
import avahi
63
67
from dbus.mainloop.glib import DBusGMainLoop
64
68
import ctypes
65
 
 
66
 
version = "1.0"
67
 
 
68
 
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'))
 
69
import ctypes.util
 
70
import xml.dom.minidom
 
71
import inspect
 
72
 
 
73
try:
 
74
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
75
except AttributeError:
 
76
    try:
 
77
        from IN import SO_BINDTODEVICE
 
78
    except ImportError:
 
79
        SO_BINDTODEVICE = None
 
80
 
 
81
 
 
82
version = "1.0.12"
 
83
 
 
84
logger = logging.Logger(u'mandos')
 
85
syslogger = (logging.handlers.SysLogHandler
 
86
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
87
              address = "/dev/log"))
 
88
syslogger.setFormatter(logging.Formatter
 
89
                       (u'Mandos [%(process)d]: %(levelname)s:'
 
90
                        u' %(message)s'))
74
91
logger.addHandler(syslogger)
75
92
 
76
93
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
 
                                       ' %(message)s'))
 
94
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
 
95
                                       u' %(levelname)s:'
 
96
                                       u' %(message)s'))
79
97
logger.addHandler(console)
80
98
 
81
99
class AvahiError(Exception):
82
 
    def __init__(self, value):
 
100
    def __init__(self, value, *args, **kwargs):
83
101
        self.value = value
84
 
    def __str__(self):
85
 
        return repr(self.value)
 
102
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
103
    def __unicode__(self):
 
104
        return unicode(repr(self.value))
86
105
 
87
106
class AvahiServiceError(AvahiError):
88
107
    pass
93
112
 
94
113
class AvahiService(object):
95
114
    """An Avahi (Zeroconf) service.
 
115
    
96
116
    Attributes:
97
117
    interface: integer; avahi.IF_UNSPEC or an interface index.
98
118
               Used to optionally bind to the specified interface.
99
 
    name: string; Example: 'Mandos'
100
 
    type: string; Example: '_mandos._tcp'.
 
119
    name: string; Example: u'Mandos'
 
120
    type: string; Example: u'_mandos._tcp'.
101
121
                  See <http://www.dns-sd.org/ServiceTypes.html>
102
122
    port: integer; what port to announce
103
123
    TXT: list of strings; TXT record for the service
106
126
    max_renames: integer; maximum number of renames
107
127
    rename_count: integer; counter so we only rename after collisions
108
128
                  a sensible number of times
 
129
    group: D-Bus Entry Group
 
130
    server: D-Bus Server
 
131
    bus: dbus.SystemBus()
109
132
    """
110
133
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
111
 
                 type = None, port = None, TXT = None, domain = "",
112
 
                 host = "", max_renames = 32768):
 
134
                 servicetype = None, port = None, TXT = None,
 
135
                 domain = u"", host = u"", max_renames = 32768,
 
136
                 protocol = avahi.PROTO_UNSPEC, bus = None):
113
137
        self.interface = interface
114
138
        self.name = name
115
 
        self.type = type
 
139
        self.type = servicetype
116
140
        self.port = port
117
 
        if TXT is None:
118
 
            self.TXT = []
119
 
        else:
120
 
            self.TXT = TXT
 
141
        self.TXT = TXT if TXT is not None else []
121
142
        self.domain = domain
122
143
        self.host = host
123
144
        self.rename_count = 0
124
145
        self.max_renames = max_renames
 
146
        self.protocol = protocol
 
147
        self.group = None       # our entry group
 
148
        self.server = None
 
149
        self.bus = bus
125
150
    def rename(self):
126
151
        """Derived from the Avahi example code"""
127
152
        if self.rename_count >= self.max_renames:
128
153
            logger.critical(u"No suitable Zeroconf service name found"
129
154
                            u" after %i retries, exiting.",
130
 
                            rename_count)
131
 
            raise AvahiServiceError("Too many renames")
132
 
        self.name = server.GetAlternativeServiceName(self.name)
 
155
                            self.rename_count)
 
156
            raise AvahiServiceError(u"Too many renames")
 
157
        self.name = self.server.GetAlternativeServiceName(self.name)
133
158
        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))
 
159
                    unicode(self.name))
 
160
        syslogger.setFormatter(logging.Formatter
 
161
                               (u'Mandos (%s) [%%(process)d]:'
 
162
                                u' %%(levelname)s: %%(message)s'
 
163
                                % self.name))
138
164
        self.remove()
139
165
        self.add()
140
166
        self.rename_count += 1
141
167
    def remove(self):
142
168
        """Derived from the Avahi example code"""
143
 
        if group is not None:
144
 
            group.Reset()
 
169
        if self.group is not None:
 
170
            self.group.Reset()
145
171
    def add(self):
146
172
        """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)
 
173
        if self.group is None:
 
174
            self.group = dbus.Interface(
 
175
                self.bus.get_object(avahi.DBUS_NAME,
 
176
                                    self.server.EntryGroupNew()),
 
177
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
178
            self.group.connect_to_signal('StateChanged',
 
179
                                         self
 
180
                                         .entry_group_state_changed)
155
181
        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
 
182
                     self.name, self.type)
 
183
        self.group.AddService(
 
184
            self.interface,
 
185
            self.protocol,
 
186
            dbus.UInt32(0),     # flags
 
187
            self.name, self.type,
 
188
            self.domain, self.host,
 
189
            dbus.UInt16(self.port),
 
190
            avahi.string_array_to_txt_array(self.TXT))
 
191
        self.group.Commit()
 
192
    def entry_group_state_changed(self, state, error):
 
193
        """Derived from the Avahi example code"""
 
194
        logger.debug(u"Avahi state change: %i", state)
 
195
        
 
196
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
197
            logger.debug(u"Zeroconf service established.")
 
198
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
199
            logger.warning(u"Zeroconf service name collision.")
 
200
            self.rename()
 
201
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
202
            logger.critical(u"Avahi: Error in group state changed %s",
 
203
                            unicode(error))
 
204
            raise AvahiGroupError(u"State changed: %s"
 
205
                                  % unicode(error))
 
206
    def cleanup(self):
 
207
        """Derived from the Avahi example code"""
 
208
        if self.group is not None:
 
209
            self.group.Free()
 
210
            self.group = None
 
211
    def server_state_changed(self, state):
 
212
        """Derived from the Avahi example code"""
 
213
        if state == avahi.SERVER_COLLISION:
 
214
            logger.error(u"Zeroconf server name collision")
 
215
            self.remove()
 
216
        elif state == avahi.SERVER_RUNNING:
 
217
            self.add()
 
218
    def activate(self):
 
219
        """Derived from the Avahi example code"""
 
220
        if self.server is None:
 
221
            self.server = dbus.Interface(
 
222
                self.bus.get_object(avahi.DBUS_NAME,
 
223
                                    avahi.DBUS_PATH_SERVER),
 
224
                avahi.DBUS_INTERFACE_SERVER)
 
225
        self.server.connect_to_signal(u"StateChanged",
 
226
                                 self.server_state_changed)
 
227
        self.server_state_changed(self.server.GetState())
170
228
 
171
229
 
172
230
class Client(object):
173
231
    """A representation of a client host served by this server.
 
232
    
174
233
    Attributes:
175
 
    name:      string; from the config file, used in log messages
 
234
    name:       string; from the config file, used in log messages and
 
235
                        D-Bus identifiers
176
236
    fingerprint: string (40 or 32 hexadecimal digits); used to
177
237
                 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.
 
238
    secret:     bytestring; sent verbatim (over TLS) to client
 
239
    host:       string; available for use by the checker command
 
240
    created:    datetime.datetime(); (UTC) object creation
 
241
    last_enabled: datetime.datetime(); (UTC)
 
242
    enabled:    bool()
 
243
    last_checked_ok: datetime.datetime(); (UTC) or None
 
244
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
245
                                      until this client is invalid
 
246
    interval:   datetime.timedelta(); How often to start a new checker
 
247
    disable_hook:  If set, called by disable() as disable_hook(self)
 
248
    checker:    subprocess.Popen(); a running checker process used
 
249
                                    to see if the client lives.
 
250
                                    'None' if no process is running.
189
251
    checker_initiator_tag: a gobject event source tag, or None
190
 
    stop_initiator_tag:    - '' -
 
252
    disable_initiator_tag: - '' -
191
253
    checker_callback_tag:  - '' -
192
254
    checker_command: string; External command which is run to check if
193
255
                     client lives.  %() expansions are done at
194
256
                     runtime with vars(self) as dict, so that for
195
257
                     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: - '' -
 
258
    current_checker_command: string; current running checker_command
201
259
    """
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={}):
 
260
    
 
261
    @staticmethod
 
262
    def _timedelta_to_milliseconds(td):
 
263
        "Convert a datetime.timedelta() to milliseconds"
 
264
        return ((td.days * 24 * 60 * 60 * 1000)
 
265
                + (td.seconds * 1000)
 
266
                + (td.microseconds // 1000))
 
267
    
 
268
    def timeout_milliseconds(self):
 
269
        "Return the 'timeout' attribute in milliseconds"
 
270
        return self._timedelta_to_milliseconds(self.timeout)
 
271
    
 
272
    def interval_milliseconds(self):
 
273
        "Return the 'interval' attribute in milliseconds"
 
274
        return self._timedelta_to_milliseconds(self.interval)
 
275
    
 
276
    def __init__(self, name = None, disable_hook=None, config=None):
226
277
        """Note: the 'checker' key in 'config' sets the
227
278
        'checker_command' attribute and *not* the 'checker'
228
279
        attribute."""
229
280
        self.name = name
 
281
        if config is None:
 
282
            config = {}
230
283
        logger.debug(u"Creating client %r", self.name)
231
284
        # Uppercase and remove spaces from fingerprint for later
232
285
        # comparison purposes with return value from the fingerprint()
233
286
        # function
234
 
        self.fingerprint = config["fingerprint"].upper()\
235
 
                           .replace(u" ", u"")
 
287
        self.fingerprint = (config[u"fingerprint"].upper()
 
288
                            .replace(u" ", u""))
236
289
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
237
 
        if "secret" in config:
238
 
            self.secret = config["secret"].decode(u"base64")
239
 
        elif "secfile" in config:
240
 
            sf = open(config["secfile"])
241
 
            self.secret = sf.read()
242
 
            sf.close()
 
290
        if u"secret" in config:
 
291
            self.secret = config[u"secret"].decode(u"base64")
 
292
        elif u"secfile" in config:
 
293
            with closing(open(os.path.expanduser
 
294
                              (os.path.expandvars
 
295
                               (config[u"secfile"])))) as secfile:
 
296
                self.secret = secfile.read()
243
297
        else:
244
298
            raise TypeError(u"No secret or secfile for client %s"
245
299
                            % self.name)
246
 
        self.host = config.get("host", "")
247
 
        self.created = datetime.datetime.now()
 
300
        self.host = config.get(u"host", u"")
 
301
        self.created = datetime.datetime.utcnow()
 
302
        self.enabled = False
 
303
        self.last_enabled = None
248
304
        self.last_checked_ok = None
249
 
        self.timeout = string_to_delta(config["timeout"])
250
 
        self.interval = string_to_delta(config["interval"])
251
 
        self.stop_hook = stop_hook
 
305
        self.timeout = string_to_delta(config[u"timeout"])
 
306
        self.interval = string_to_delta(config[u"interval"])
 
307
        self.disable_hook = disable_hook
252
308
        self.checker = None
253
309
        self.checker_initiator_tag = None
254
 
        self.stop_initiator_tag = None
 
310
        self.disable_initiator_tag = None
255
311
        self.checker_callback_tag = None
256
 
        self.check_command = config["checker"]
257
 
    def start(self):
 
312
        self.checker_command = config[u"checker"]
 
313
        self.current_checker_command = None
 
314
        self.last_connect = None
 
315
    
 
316
    def enable(self):
258
317
        """Start this client's checker and timeout hooks"""
 
318
        if getattr(self, u"enabled", False):
 
319
            # Already enabled
 
320
            return
 
321
        self.last_enabled = datetime.datetime.utcnow()
259
322
        # Schedule a new checker to be started an 'interval' from now,
260
323
        # and every interval from then on.
261
 
        self.checker_initiator_tag = gobject.timeout_add\
262
 
                                     (self._interval_milliseconds,
263
 
                                      self.start_checker)
 
324
        self.checker_initiator_tag = (gobject.timeout_add
 
325
                                      (self.interval_milliseconds(),
 
326
                                       self.start_checker))
264
327
        # Also start a new checker *right now*.
265
328
        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:
 
329
        # Schedule a disable() when 'timeout' has passed
 
330
        self.disable_initiator_tag = (gobject.timeout_add
 
331
                                   (self.timeout_milliseconds(),
 
332
                                    self.disable))
 
333
        self.enabled = True
 
334
    
 
335
    def disable(self):
 
336
        """Disable this client."""
 
337
        if not getattr(self, "enabled", False):
279
338
            return False
280
 
        if getattr(self, "stop_initiator_tag", False):
281
 
            gobject.source_remove(self.stop_initiator_tag)
282
 
            self.stop_initiator_tag = None
283
 
        if getattr(self, "checker_initiator_tag", False):
 
339
        logger.info(u"Disabling client %s", self.name)
 
340
        if getattr(self, u"disable_initiator_tag", False):
 
341
            gobject.source_remove(self.disable_initiator_tag)
 
342
            self.disable_initiator_tag = None
 
343
        if getattr(self, u"checker_initiator_tag", False):
284
344
            gobject.source_remove(self.checker_initiator_tag)
285
345
            self.checker_initiator_tag = None
286
346
        self.stop_checker()
287
 
        if self.stop_hook:
288
 
            self.stop_hook(self)
 
347
        if self.disable_hook:
 
348
            self.disable_hook(self)
 
349
        self.enabled = False
289
350
        # Do not run this again if called by a gobject.timeout_add
290
351
        return False
 
352
    
291
353
    def __del__(self):
292
 
        self.stop_hook = None
293
 
        self.stop()
294
 
    def checker_callback(self, pid, condition):
 
354
        self.disable_hook = None
 
355
        self.disable()
 
356
    
 
357
    def checker_callback(self, pid, condition, command):
295
358
        """The checker has completed, so take appropriate actions."""
296
 
        now = datetime.datetime.now()
297
359
        self.checker_callback_tag = None
298
360
        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):
 
361
        if os.WIFEXITED(condition):
 
362
            exitstatus = os.WEXITSTATUS(condition)
 
363
            if exitstatus == 0:
 
364
                logger.info(u"Checker for %(name)s succeeded",
 
365
                            vars(self))
 
366
                self.checked_ok()
 
367
            else:
 
368
                logger.info(u"Checker for %(name)s failed",
 
369
                            vars(self))
 
370
        else:
309
371
            logger.warning(u"Checker for %(name)s crashed?",
310
372
                           vars(self))
311
 
        else:
312
 
            logger.info(u"Checker for %(name)s failed",
313
 
                        vars(self))
 
373
    
 
374
    def checked_ok(self):
 
375
        """Bump up the timeout for this client.
 
376
        
 
377
        This should only be called when the client has been seen,
 
378
        alive and well.
 
379
        """
 
380
        self.last_checked_ok = datetime.datetime.utcnow()
 
381
        gobject.source_remove(self.disable_initiator_tag)
 
382
        self.disable_initiator_tag = (gobject.timeout_add
 
383
                                      (self.timeout_milliseconds(),
 
384
                                       self.disable))
 
385
    
314
386
    def start_checker(self):
315
387
        """Start a new checker subprocess if one is not running.
 
388
        
316
389
        If a checker already exists, leave it running and do
317
390
        nothing."""
318
391
        # The reason for not killing a running checker is that if we
323
396
        # checkers alone, the checker would have to take more time
324
397
        # than 'timeout' for the client to be declared invalid, which
325
398
        # is as it should be.
 
399
        
 
400
        # If a checker exists, make sure it is not a zombie
 
401
        if self.checker is not None:
 
402
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
403
            if pid:
 
404
                logger.warning(u"Checker was a zombie")
 
405
                gobject.source_remove(self.checker_callback_tag)
 
406
                self.checker_callback(pid, status,
 
407
                                      self.current_checker_command)
 
408
        # Start a new checker if needed
326
409
        if self.checker is None:
327
410
            try:
328
 
                # In case check_command has exactly one % operator
329
 
                command = self.check_command % self.host
 
411
                # In case checker_command has exactly one % operator
 
412
                command = self.checker_command % self.host
330
413
            except TypeError:
331
414
                # Escape attributes for the shell
332
 
                escaped_attrs = dict((key, re.escape(str(val)))
 
415
                escaped_attrs = dict((key,
 
416
                                      re.escape(unicode(str(val),
 
417
                                                        errors=
 
418
                                                        u'replace')))
333
419
                                     for key, val in
334
420
                                     vars(self).iteritems())
335
421
                try:
336
 
                    command = self.check_command % escaped_attrs
 
422
                    command = self.checker_command % escaped_attrs
337
423
                except TypeError, error:
338
424
                    logger.error(u'Could not format string "%s":'
339
 
                                 u' %s', self.check_command, error)
 
425
                                 u' %s', self.checker_command, error)
340
426
                    return True # Try again later
 
427
            self.current_checker_command = command
341
428
            try:
342
429
                logger.info(u"Starting checker %r for %s",
343
430
                            command, self.name)
347
434
                # always replaced by /dev/null.)
348
435
                self.checker = subprocess.Popen(command,
349
436
                                                close_fds=True,
350
 
                                                shell=True, cwd="/")
351
 
                self.checker_callback_tag = gobject.child_watch_add\
352
 
                                            (self.checker.pid,
353
 
                                             self.checker_callback)
 
437
                                                shell=True, cwd=u"/")
 
438
                self.checker_callback_tag = (gobject.child_watch_add
 
439
                                             (self.checker.pid,
 
440
                                              self.checker_callback,
 
441
                                              data=command))
 
442
                # The checker may have completed before the gobject
 
443
                # watch was added.  Check for this.
 
444
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
445
                if pid:
 
446
                    gobject.source_remove(self.checker_callback_tag)
 
447
                    self.checker_callback(pid, status, command)
354
448
            except OSError, error:
355
449
                logger.error(u"Failed to start subprocess: %s",
356
450
                             error)
357
451
        # Re-run this periodically if run by gobject.timeout_add
358
452
        return True
 
453
    
359
454
    def stop_checker(self):
360
455
        """Force the checker process, if any, to stop."""
361
456
        if self.checker_callback_tag:
362
457
            gobject.source_remove(self.checker_callback_tag)
363
458
            self.checker_callback_tag = None
364
 
        if getattr(self, "checker", None) is None:
 
459
        if getattr(self, u"checker", None) is None:
365
460
            return
366
461
        logger.debug(u"Stopping checker for %(name)s", vars(self))
367
462
        try:
373
468
            if error.errno != errno.ESRCH: # No such process
374
469
                raise
375
470
        self.checker = None
 
471
    
376
472
    def still_valid(self):
377
473
        """Has the timeout not yet passed for this client?"""
378
 
        now = datetime.datetime.now()
 
474
        if not getattr(self, u"enabled", False):
 
475
            return False
 
476
        now = datetime.datetime.utcnow()
379
477
        if self.last_checked_ok is None:
380
478
            return now < (self.created + self.timeout)
381
479
        else:
382
480
            return now < (self.last_checked_ok + self.timeout)
383
481
 
384
482
 
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.
 
483
def dbus_service_property(dbus_interface, signature=u"v",
 
484
                          access=u"readwrite", byte_arrays=False):
 
485
    """Decorators for marking methods of a DBusObjectWithProperties to
 
486
    become properties on the D-Bus.
 
487
    
 
488
    The decorated method will be called with no arguments by "Get"
 
489
    and with one argument by "Set".
 
490
    
 
491
    The parameters, where they are supported, are the same as
 
492
    dbus.service.method, except there is only "signature", since the
 
493
    type from Get() and the type sent to Set() is the same.
 
494
    """
 
495
    def decorator(func):
 
496
        func._dbus_is_property = True
 
497
        func._dbus_interface = dbus_interface
 
498
        func._dbus_signature = signature
 
499
        func._dbus_access = access
 
500
        func._dbus_name = func.__name__
 
501
        if func._dbus_name.endswith(u"_dbus_property"):
 
502
            func._dbus_name = func._dbus_name[:-14]
 
503
        func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
 
504
        return func
 
505
    return decorator
 
506
 
 
507
 
 
508
class DBusPropertyException(dbus.exceptions.DBusException):
 
509
    """A base class for D-Bus property-related exceptions
 
510
    """
 
511
    def __unicode__(self):
 
512
        return unicode(str(self))
 
513
 
 
514
 
 
515
class DBusPropertyAccessException(DBusPropertyException):
 
516
    """A property's access permissions disallows an operation.
 
517
    """
 
518
    pass
 
519
 
 
520
 
 
521
class DBusPropertyNotFound(DBusPropertyException):
 
522
    """An attempt was made to access a non-existing property.
 
523
    """
 
524
    pass
 
525
 
 
526
 
 
527
class DBusObjectWithProperties(dbus.service.Object):
 
528
    """A D-Bus object with properties.
 
529
 
 
530
    Classes inheriting from this can use the dbus_service_property
 
531
    decorator to expose methods as D-Bus properties.  It exposes the
 
532
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
533
    """
 
534
    
 
535
    @staticmethod
 
536
    def _is_dbus_property(obj):
 
537
        return getattr(obj, u"_dbus_is_property", False)
 
538
    
 
539
    def _get_all_dbus_properties(self):
 
540
        """Returns a generator of (name, attribute) pairs
 
541
        """
 
542
        return ((prop._dbus_name, prop)
 
543
                for name, prop in
 
544
                inspect.getmembers(self, self._is_dbus_property))
 
545
    
 
546
    def _get_dbus_property(self, interface_name, property_name):
 
547
        """Returns a bound method if one exists which is a D-Bus
 
548
        property with the specified name and interface.
 
549
        """
 
550
        for name in (property_name,
 
551
                     property_name + u"_dbus_property"):
 
552
            prop = getattr(self, name, None)
 
553
            if (prop is None
 
554
                or not self._is_dbus_property(prop)
 
555
                or prop._dbus_name != property_name
 
556
                or (interface_name and prop._dbus_interface
 
557
                    and interface_name != prop._dbus_interface)):
 
558
                continue
 
559
            return prop
 
560
        # No such property
 
561
        raise DBusPropertyNotFound(self.dbus_object_path + u":"
 
562
                                   + interface_name + u"."
 
563
                                   + property_name)
 
564
    
 
565
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
 
566
                         out_signature=u"v")
 
567
    def Get(self, interface_name, property_name):
 
568
        """Standard D-Bus property Get() method, see D-Bus standard.
 
569
        """
 
570
        prop = self._get_dbus_property(interface_name, property_name)
 
571
        if prop._dbus_access == u"write":
 
572
            raise DBusPropertyAccessException(property_name)
 
573
        value = prop()
 
574
        if not hasattr(value, u"variant_level"):
 
575
            return value
 
576
        return type(value)(value, variant_level=value.variant_level+1)
 
577
    
 
578
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
 
579
    def Set(self, interface_name, property_name, value):
 
580
        """Standard D-Bus property Set() method, see D-Bus standard.
 
581
        """
 
582
        prop = self._get_dbus_property(interface_name, property_name)
 
583
        if prop._dbus_access == u"read":
 
584
            raise DBusPropertyAccessException(property_name)
 
585
        if prop._dbus_get_args_options[u"byte_arrays"]:
 
586
            value = dbus.ByteArray(''.join(unichr(byte)
 
587
                                           for byte in value))
 
588
        prop(value)
 
589
    
 
590
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
 
591
                         out_signature=u"a{sv}")
 
592
    def GetAll(self, interface_name):
 
593
        """Standard D-Bus property GetAll() method, see D-Bus
 
594
        standard.
 
595
 
 
596
        Note: Will not include properties with access="write".
 
597
        """
 
598
        all = {}
 
599
        for name, prop in self._get_all_dbus_properties():
 
600
            if (interface_name
 
601
                and interface_name != prop._dbus_interface):
 
602
                # Interface non-empty but did not match
 
603
                continue
 
604
            # Ignore write-only properties
 
605
            if prop._dbus_access == u"write":
 
606
                continue
 
607
            value = prop()
 
608
            if not hasattr(value, u"variant_level"):
 
609
                all[name] = value
 
610
                continue
 
611
            all[name] = type(value)(value, variant_level=
 
612
                                    value.variant_level+1)
 
613
        return dbus.Dictionary(all, signature=u"sv")
 
614
    
 
615
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
616
                         out_signature=u"s",
 
617
                         path_keyword='object_path',
 
618
                         connection_keyword='connection')
 
619
    def Introspect(self, object_path, connection):
 
620
        """Standard D-Bus method, overloaded to insert property tags.
 
621
        """
 
622
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
623
                                           connection)
 
624
        document = xml.dom.minidom.parseString(xmlstring)
 
625
        del xmlstring
 
626
        def make_tag(document, name, prop):
 
627
            e = document.createElement(u"property")
 
628
            e.setAttribute(u"name", name)
 
629
            e.setAttribute(u"type", prop._dbus_signature)
 
630
            e.setAttribute(u"access", prop._dbus_access)
 
631
            return e
 
632
        for if_tag in document.getElementsByTagName(u"interface"):
 
633
            for tag in (make_tag(document, name, prop)
 
634
                        for name, prop
 
635
                        in self._get_all_dbus_properties()
 
636
                        if prop._dbus_interface
 
637
                        == if_tag.getAttribute(u"name")):
 
638
                if_tag.appendChild(tag)
 
639
        xmlstring = document.toxml(u"utf-8")
 
640
        document.unlink()
 
641
        return xmlstring
 
642
 
 
643
 
 
644
class ClientDBus(Client, DBusObjectWithProperties):
 
645
    """A Client class using D-Bus
 
646
    
 
647
    Attributes:
 
648
    dbus_object_path: dbus.ObjectPath
 
649
    bus: dbus.SystemBus()
 
650
    """
 
651
    # dbus.service.Object doesn't use super(), so we can't either.
 
652
    
 
653
    def __init__(self, bus = None, *args, **kwargs):
 
654
        self.bus = bus
 
655
        Client.__init__(self, *args, **kwargs)
 
656
        # Only now, when this client is initialized, can it show up on
 
657
        # the D-Bus
 
658
        self.dbus_object_path = (dbus.ObjectPath
 
659
                                 (u"/clients/"
 
660
                                  + self.name.replace(u".", u"_")))
 
661
        DBusObjectWithProperties.__init__(self, self.bus,
 
662
                                          self.dbus_object_path)
 
663
    
 
664
    @staticmethod
 
665
    def _datetime_to_dbus(dt, variant_level=0):
 
666
        """Convert a UTC datetime.datetime() to a D-Bus type."""
 
667
        return dbus.String(dt.isoformat(),
 
668
                           variant_level=variant_level)
 
669
    
 
670
    def enable(self):
 
671
        oldstate = getattr(self, u"enabled", False)
 
672
        r = Client.enable(self)
 
673
        if oldstate != self.enabled:
 
674
            # Emit D-Bus signals
 
675
            self.PropertyChanged(dbus.String(u"enabled"),
 
676
                                 dbus.Boolean(True, variant_level=1))
 
677
            self.PropertyChanged(
 
678
                dbus.String(u"last_enabled"),
 
679
                self._datetime_to_dbus(self.last_enabled,
 
680
                                       variant_level=1))
 
681
        return r
 
682
    
 
683
    def disable(self, signal = True):
 
684
        oldstate = getattr(self, u"enabled", False)
 
685
        r = Client.disable(self)
 
686
        if signal and oldstate != self.enabled:
 
687
            # Emit D-Bus signal
 
688
            self.PropertyChanged(dbus.String(u"enabled"),
 
689
                                 dbus.Boolean(False, variant_level=1))
 
690
        return r
 
691
    
 
692
    def __del__(self, *args, **kwargs):
 
693
        try:
 
694
            self.remove_from_connection()
 
695
        except LookupError:
 
696
            pass
 
697
        if hasattr(DBusObjectWithProperties, u"__del__"):
 
698
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
699
        Client.__del__(self, *args, **kwargs)
 
700
    
 
701
    def checker_callback(self, pid, condition, command,
 
702
                         *args, **kwargs):
 
703
        self.checker_callback_tag = None
 
704
        self.checker = None
 
705
        # Emit D-Bus signal
 
706
        self.PropertyChanged(dbus.String(u"checker_running"),
 
707
                             dbus.Boolean(False, variant_level=1))
 
708
        if os.WIFEXITED(condition):
 
709
            exitstatus = os.WEXITSTATUS(condition)
 
710
            # Emit D-Bus signal
 
711
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
712
                                  dbus.Int64(condition),
 
713
                                  dbus.String(command))
 
714
        else:
 
715
            # Emit D-Bus signal
 
716
            self.CheckerCompleted(dbus.Int16(-1),
 
717
                                  dbus.Int64(condition),
 
718
                                  dbus.String(command))
 
719
        
 
720
        return Client.checker_callback(self, pid, condition, command,
 
721
                                       *args, **kwargs)
 
722
    
 
723
    def checked_ok(self, *args, **kwargs):
 
724
        r = Client.checked_ok(self, *args, **kwargs)
 
725
        # Emit D-Bus signal
 
726
        self.PropertyChanged(
 
727
            dbus.String(u"last_checked_ok"),
 
728
            (self._datetime_to_dbus(self.last_checked_ok,
 
729
                                    variant_level=1)))
 
730
        return r
 
731
    
 
732
    def start_checker(self, *args, **kwargs):
 
733
        old_checker = self.checker
 
734
        if self.checker is not None:
 
735
            old_checker_pid = self.checker.pid
 
736
        else:
 
737
            old_checker_pid = None
 
738
        r = Client.start_checker(self, *args, **kwargs)
 
739
        # Only if new checker process was started
 
740
        if (self.checker is not None
 
741
            and old_checker_pid != self.checker.pid):
 
742
            # Emit D-Bus signal
 
743
            self.CheckerStarted(self.current_checker_command)
 
744
            self.PropertyChanged(
 
745
                dbus.String(u"checker_running"),
 
746
                dbus.Boolean(True, variant_level=1))
 
747
        return r
 
748
    
 
749
    def stop_checker(self, *args, **kwargs):
 
750
        old_checker = getattr(self, u"checker", None)
 
751
        r = Client.stop_checker(self, *args, **kwargs)
 
752
        if (old_checker is not None
 
753
            and getattr(self, u"checker", None) is None):
 
754
            self.PropertyChanged(dbus.String(u"checker_running"),
 
755
                                 dbus.Boolean(False, variant_level=1))
 
756
        return r
 
757
    
 
758
    ## D-Bus methods & signals
 
759
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
760
    
 
761
    # CheckedOK - method
 
762
    @dbus.service.method(_interface)
 
763
    def CheckedOK(self):
 
764
        return self.checked_ok()
 
765
    
 
766
    # CheckerCompleted - signal
 
767
    @dbus.service.signal(_interface, signature=u"nxs")
 
768
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
769
        "D-Bus signal"
 
770
        pass
 
771
    
 
772
    # CheckerStarted - signal
 
773
    @dbus.service.signal(_interface, signature=u"s")
 
774
    def CheckerStarted(self, command):
 
775
        "D-Bus signal"
 
776
        pass
 
777
    
 
778
    # PropertyChanged - signal
 
779
    @dbus.service.signal(_interface, signature=u"sv")
 
780
    def PropertyChanged(self, property, value):
 
781
        "D-Bus signal"
 
782
        pass
 
783
    
 
784
    # ReceivedSecret - signal
 
785
    @dbus.service.signal(_interface)
 
786
    def ReceivedSecret(self):
 
787
        "D-Bus signal"
 
788
        pass
 
789
    
 
790
    # Rejected - signal
 
791
    @dbus.service.signal(_interface)
 
792
    def Rejected(self):
 
793
        "D-Bus signal"
 
794
        pass
 
795
    
 
796
    # Enable - method
 
797
    @dbus.service.method(_interface)
 
798
    def Enable(self):
 
799
        "D-Bus method"
 
800
        self.enable()
 
801
    
 
802
    # StartChecker - method
 
803
    @dbus.service.method(_interface)
 
804
    def StartChecker(self):
 
805
        "D-Bus method"
 
806
        self.start_checker()
 
807
    
 
808
    # Disable - method
 
809
    @dbus.service.method(_interface)
 
810
    def Disable(self):
 
811
        "D-Bus method"
 
812
        self.disable()
 
813
    
 
814
    # StopChecker - method
 
815
    @dbus.service.method(_interface)
 
816
    def StopChecker(self):
 
817
        self.stop_checker()
 
818
    
 
819
    # name - property
 
820
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
821
    def name_dbus_property(self):
 
822
        return dbus.String(self.name)
 
823
    
 
824
    # fingerprint - property
 
825
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
826
    def fingerprint_dbus_property(self):
 
827
        return dbus.String(self.fingerprint)
 
828
    
 
829
    # host - property
 
830
    @dbus_service_property(_interface, signature=u"s",
 
831
                           access=u"readwrite")
 
832
    def host_dbus_property(self, value=None):
 
833
        if value is None:       # get
 
834
            return dbus.String(self.host)
 
835
        self.host = value
 
836
        # Emit D-Bus signal
 
837
        self.PropertyChanged(dbus.String(u"host"),
 
838
                             dbus.String(value, variant_level=1))
 
839
    
 
840
    # created - property
 
841
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
842
    def created_dbus_property(self):
 
843
        return dbus.String(self._datetime_to_dbus(self.created))
 
844
    
 
845
    # last_enabled - property
 
846
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
847
    def last_enabled_dbus_property(self):
 
848
        if self.last_enabled is None:
 
849
            return dbus.String(u"")
 
850
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
 
851
    
 
852
    # enabled - property
 
853
    @dbus_service_property(_interface, signature=u"b",
 
854
                           access=u"readwrite")
 
855
    def enabled_dbus_property(self, value=None):
 
856
        if value is None:       # get
 
857
            return dbus.Boolean(self.enabled)
 
858
        if value:
 
859
            self.enable()
 
860
        else:
 
861
            self.disable()
 
862
    
 
863
    # last_checked_ok - property
 
864
    @dbus_service_property(_interface, signature=u"s",
 
865
                           access=u"readwrite")
 
866
    def last_checked_ok_dbus_property(self, value=None):
 
867
        if value is not None:
 
868
            self.checked_ok()
 
869
            return
 
870
        if self.last_checked_ok is None:
 
871
            return dbus.String(u"")
 
872
        return dbus.String(self._datetime_to_dbus(self
 
873
                                                  .last_checked_ok))
 
874
    
 
875
    # timeout - property
 
876
    @dbus_service_property(_interface, signature=u"t",
 
877
                           access=u"readwrite")
 
878
    def timeout_dbus_property(self, value=None):
 
879
        if value is None:       # get
 
880
            return dbus.UInt64(self.timeout_milliseconds())
 
881
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
882
        # Emit D-Bus signal
 
883
        self.PropertyChanged(dbus.String(u"timeout"),
 
884
                             dbus.UInt64(value, variant_level=1))
 
885
        if getattr(self, u"disable_initiator_tag", None) is None:
 
886
            return
 
887
        # Reschedule timeout
 
888
        gobject.source_remove(self.disable_initiator_tag)
 
889
        self.disable_initiator_tag = None
 
890
        time_to_die = (self.
 
891
                       _timedelta_to_milliseconds((self
 
892
                                                   .last_checked_ok
 
893
                                                   + self.timeout)
 
894
                                                  - datetime.datetime
 
895
                                                  .utcnow()))
 
896
        if time_to_die <= 0:
 
897
            # The timeout has passed
 
898
            self.disable()
 
899
        else:
 
900
            self.disable_initiator_tag = (gobject.timeout_add
 
901
                                          (time_to_die, self.disable))
 
902
    
 
903
    # interval - property
 
904
    @dbus_service_property(_interface, signature=u"t",
 
905
                           access=u"readwrite")
 
906
    def interval_dbus_property(self, value=None):
 
907
        if value is None:       # get
 
908
            return dbus.UInt64(self.interval_milliseconds())
 
909
        self.interval = datetime.timedelta(0, 0, 0, value)
 
910
        # Emit D-Bus signal
 
911
        self.PropertyChanged(dbus.String(u"interval"),
 
912
                             dbus.UInt64(value, variant_level=1))
 
913
        if getattr(self, u"checker_initiator_tag", None) is None:
 
914
            return
 
915
        # Reschedule checker run
 
916
        gobject.source_remove(self.checker_initiator_tag)
 
917
        self.checker_initiator_tag = (gobject.timeout_add
 
918
                                      (value, self.start_checker))
 
919
        self.start_checker()    # Start one now, too
 
920
 
 
921
    # checker - property
 
922
    @dbus_service_property(_interface, signature=u"s",
 
923
                           access=u"readwrite")
 
924
    def checker_dbus_property(self, value=None):
 
925
        if value is None:       # get
 
926
            return dbus.String(self.checker_command)
 
927
        self.checker_command = value
 
928
        # Emit D-Bus signal
 
929
        self.PropertyChanged(dbus.String(u"checker"),
 
930
                             dbus.String(self.checker_command,
 
931
                                         variant_level=1))
 
932
    
 
933
    # checker_running - property
 
934
    @dbus_service_property(_interface, signature=u"b",
 
935
                           access=u"readwrite")
 
936
    def checker_running_dbus_property(self, value=None):
 
937
        if value is None:       # get
 
938
            return dbus.Boolean(self.checker is not None)
 
939
        if value:
 
940
            self.start_checker()
 
941
        else:
 
942
            self.stop_checker()
 
943
    
 
944
    # object_path - property
 
945
    @dbus_service_property(_interface, signature=u"o", access=u"read")
 
946
    def object_path_dbus_property(self):
 
947
        return self.dbus_object_path # is already a dbus.ObjectPath
 
948
    
 
949
    # secret = property
 
950
    @dbus_service_property(_interface, signature=u"ay",
 
951
                           access=u"write", byte_arrays=True)
 
952
    def secret_dbus_property(self, value):
 
953
        self.secret = str(value)
 
954
    
 
955
    del _interface
 
956
 
 
957
 
 
958
class ClientHandler(socketserver.BaseRequestHandler, object):
 
959
    """A class to handle client connections.
 
960
    
 
961
    Instantiated once for each connection to handle it.
442
962
    Note: This will run in its own forked process."""
443
963
    
444
964
    def handle(self):
445
965
        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.
 
966
                    unicode(self.client_address))
 
967
        logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
 
968
        # Open IPC pipe to parent process
 
969
        with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
 
970
            session = (gnutls.connection
 
971
                       .ClientSession(self.request,
 
972
                                      gnutls.connection
 
973
                                      .X509Credentials()))
 
974
            
 
975
            line = self.request.makefile().readline()
 
976
            logger.debug(u"Protocol version: %r", line)
 
977
            try:
 
978
                if int(line.strip().split()[0]) > 1:
 
979
                    raise RuntimeError
 
980
            except (ValueError, IndexError, RuntimeError), error:
 
981
                logger.error(u"Unknown protocol version: %s", error)
 
982
                return
 
983
            
 
984
            # Note: gnutls.connection.X509Credentials is really a
 
985
            # generic GnuTLS certificate credentials object so long as
 
986
            # no X.509 keys are added to it.  Therefore, we can use it
 
987
            # here despite using OpenPGP certificates.
 
988
            
 
989
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
 
990
            #                      u"+AES-256-CBC", u"+SHA1",
 
991
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
 
992
            #                      u"+DHE-DSS"))
 
993
            # Use a fallback default, since this MUST be set.
 
994
            priority = self.server.gnutls_priority
 
995
            if priority is None:
 
996
                priority = u"NORMAL"
 
997
            (gnutls.library.functions
 
998
             .gnutls_priority_set_direct(session._c_object,
 
999
                                         priority, None))
 
1000
            
 
1001
            try:
 
1002
                session.handshake()
 
1003
            except gnutls.errors.GNUTLSError, error:
 
1004
                logger.warning(u"Handshake failed: %s", error)
 
1005
                # Do not run session.bye() here: the session is not
 
1006
                # established.  Just abandon the request.
 
1007
                return
 
1008
            logger.debug(u"Handshake succeeded")
 
1009
            try:
 
1010
                fpr = self.fingerprint(self.peer_certificate(session))
 
1011
            except (TypeError, gnutls.errors.GNUTLSError), error:
 
1012
                logger.warning(u"Bad certificate: %s", error)
 
1013
                session.bye()
 
1014
                return
 
1015
            logger.debug(u"Fingerprint: %s", fpr)
 
1016
            
 
1017
            for c in self.server.clients:
 
1018
                if c.fingerprint == fpr:
 
1019
                    client = c
 
1020
                    break
 
1021
            else:
 
1022
                ipc.write(u"NOTFOUND %s %s\n"
 
1023
                          % (fpr, unicode(self.client_address)))
 
1024
                session.bye()
 
1025
                return
 
1026
            # Have to check if client.still_valid(), since it is
 
1027
            # possible that the client timed out while establishing
 
1028
            # the GnuTLS session.
 
1029
            if not client.still_valid():
 
1030
                ipc.write(u"INVALID %s\n" % client.name)
 
1031
                session.bye()
 
1032
                return
 
1033
            ipc.write(u"SENDING %s\n" % client.name)
 
1034
            sent_size = 0
 
1035
            while sent_size < len(client.secret):
 
1036
                sent = session.send(client.secret[sent_size:])
 
1037
                logger.debug(u"Sent: %d, remaining: %d",
 
1038
                             sent, len(client.secret)
 
1039
                             - (sent_size + sent))
 
1040
                sent_size += sent
 
1041
            session.bye()
 
1042
    
 
1043
    @staticmethod
 
1044
    def peer_certificate(session):
 
1045
        "Return the peer's OpenPGP certificate as a bytestring"
 
1046
        # If not an OpenPGP certificate...
 
1047
        if (gnutls.library.functions
 
1048
            .gnutls_certificate_type_get(session._c_object)
 
1049
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
1050
            # ...do the normal thing
 
1051
            return session.peer_certificate
 
1052
        list_size = ctypes.c_uint(1)
 
1053
        cert_list = (gnutls.library.functions
 
1054
                     .gnutls_certificate_get_peers
 
1055
                     (session._c_object, ctypes.byref(list_size)))
 
1056
        if not bool(cert_list) and list_size.value != 0:
 
1057
            raise gnutls.errors.GNUTLSError(u"error getting peer"
 
1058
                                            u" certificate")
 
1059
        if list_size.value == 0:
 
1060
            return None
 
1061
        cert = cert_list[0]
 
1062
        return ctypes.string_at(cert.data, cert.size)
 
1063
    
 
1064
    @staticmethod
 
1065
    def fingerprint(openpgp):
 
1066
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
1067
        # New GnuTLS "datum" with the OpenPGP public key
 
1068
        datum = (gnutls.library.types
 
1069
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
1070
                                             ctypes.POINTER
 
1071
                                             (ctypes.c_ubyte)),
 
1072
                                 ctypes.c_uint(len(openpgp))))
 
1073
        # New empty GnuTLS certificate
 
1074
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
1075
        (gnutls.library.functions
 
1076
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
1077
        # Import the OpenPGP public key into the certificate
 
1078
        (gnutls.library.functions
 
1079
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
1080
                                    gnutls.library.constants
 
1081
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
1082
        # Verify the self signature in the key
 
1083
        crtverify = ctypes.c_uint()
 
1084
        (gnutls.library.functions
 
1085
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
1086
                                         ctypes.byref(crtverify)))
 
1087
        if crtverify.value != 0:
 
1088
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1089
            raise (gnutls.errors.CertificateSecurityError
 
1090
                   (u"Verify failed"))
 
1091
        # New buffer for the fingerprint
 
1092
        buf = ctypes.create_string_buffer(20)
 
1093
        buf_len = ctypes.c_size_t()
 
1094
        # Get the fingerprint from the certificate into the buffer
 
1095
        (gnutls.library.functions
 
1096
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
1097
                                             ctypes.byref(buf_len)))
 
1098
        # Deinit the certificate
 
1099
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1100
        # Convert the buffer to a Python bytestring
 
1101
        fpr = ctypes.string_at(buf, buf_len.value)
 
1102
        # Convert the bytestring to hexadecimal notation
 
1103
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
1104
        return hex_fpr
 
1105
 
 
1106
 
 
1107
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
 
1108
    """Like socketserver.ForkingMixIn, but also pass a pipe."""
 
1109
    def process_request(self, request, client_address):
 
1110
        """Overrides and wraps the original process_request().
 
1111
        
 
1112
        This function creates a new pipe in self.pipe
 
1113
        """
 
1114
        self.pipe = os.pipe()
 
1115
        super(ForkingMixInWithPipe,
 
1116
              self).process_request(request, client_address)
 
1117
        os.close(self.pipe[1])  # close write end
 
1118
        self.add_pipe(self.pipe[0])
 
1119
    def add_pipe(self, pipe):
 
1120
        """Dummy function; override as necessary"""
 
1121
        os.close(pipe)
 
1122
 
 
1123
 
 
1124
class IPv6_TCPServer(ForkingMixInWithPipe,
 
1125
                     socketserver.TCPServer, object):
 
1126
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
1127
    
518
1128
    Attributes:
519
 
        settings:       Server settings
520
 
        clients:        Set() of Client objects
521
1129
        enabled:        Boolean; whether this server is activated yet
 
1130
        interface:      None or a network interface name (string)
 
1131
        use_ipv6:       Boolean; to use IPv6 or not
522
1132
    """
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)
 
1133
    def __init__(self, server_address, RequestHandlerClass,
 
1134
                 interface=None, use_ipv6=True):
 
1135
        self.interface = interface
 
1136
        if use_ipv6:
 
1137
            self.address_family = socket.AF_INET6
 
1138
        socketserver.TCPServer.__init__(self, server_address,
 
1139
                                        RequestHandlerClass)
533
1140
    def server_bind(self):
534
1141
        """This overrides the normal server_bind() function
535
1142
        to bind to an interface if one was specified, and also NOT to
536
1143
        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
 
1144
        if self.interface is not None:
 
1145
            if SO_BINDTODEVICE is None:
 
1146
                logger.error(u"SO_BINDTODEVICE does not exist;"
 
1147
                             u" cannot bind to interface %s",
 
1148
                             self.interface)
 
1149
            else:
 
1150
                try:
 
1151
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
1152
                                           SO_BINDTODEVICE,
 
1153
                                           str(self.interface
 
1154
                                               + u'\0'))
 
1155
                except socket.error, error:
 
1156
                    if error[0] == errno.EPERM:
 
1157
                        logger.error(u"No permission to"
 
1158
                                     u" bind to interface %s",
 
1159
                                     self.interface)
 
1160
                    elif error[0] == errno.ENOPROTOOPT:
 
1161
                        logger.error(u"SO_BINDTODEVICE not available;"
 
1162
                                     u" cannot bind to interface %s",
 
1163
                                     self.interface)
 
1164
                    else:
 
1165
                        raise
551
1166
        # Only bind(2) the socket if we really need to.
552
1167
        if self.server_address[0] or self.server_address[1]:
553
1168
            if not self.server_address[0]:
554
 
                in6addr_any = "::"
555
 
                self.server_address = (in6addr_any,
 
1169
                if self.address_family == socket.AF_INET6:
 
1170
                    any_address = u"::" # in6addr_any
 
1171
                else:
 
1172
                    any_address = socket.INADDR_ANY
 
1173
                self.server_address = (any_address,
556
1174
                                       self.server_address[1])
557
1175
            elif not self.server_address[1]:
558
1176
                self.server_address = (self.server_address[0],
559
1177
                                       0)
560
 
#                 if self.settings["interface"]:
 
1178
#                 if self.interface:
561
1179
#                     self.server_address = (self.server_address[0],
562
1180
#                                            0, # port
563
1181
#                                            0, # flowinfo
564
1182
#                                            if_nametoindex
565
 
#                                            (self.settings
566
 
#                                             ["interface"]))
567
 
            return super(type(self), self).server_bind()
 
1183
#                                            (self.interface))
 
1184
            return socketserver.TCPServer.server_bind(self)
 
1185
 
 
1186
 
 
1187
class MandosServer(IPv6_TCPServer):
 
1188
    """Mandos server.
 
1189
    
 
1190
    Attributes:
 
1191
        clients:        set of Client objects
 
1192
        gnutls_priority GnuTLS priority string
 
1193
        use_dbus:       Boolean; to emit D-Bus signals or not
 
1194
    
 
1195
    Assumes a gobject.MainLoop event loop.
 
1196
    """
 
1197
    def __init__(self, server_address, RequestHandlerClass,
 
1198
                 interface=None, use_ipv6=True, clients=None,
 
1199
                 gnutls_priority=None, use_dbus=True):
 
1200
        self.enabled = False
 
1201
        self.clients = clients
 
1202
        if self.clients is None:
 
1203
            self.clients = set()
 
1204
        self.use_dbus = use_dbus
 
1205
        self.gnutls_priority = gnutls_priority
 
1206
        IPv6_TCPServer.__init__(self, server_address,
 
1207
                                RequestHandlerClass,
 
1208
                                interface = interface,
 
1209
                                use_ipv6 = use_ipv6)
568
1210
    def server_activate(self):
569
1211
        if self.enabled:
570
 
            return super(type(self), self).server_activate()
 
1212
            return socketserver.TCPServer.server_activate(self)
571
1213
    def enable(self):
572
1214
        self.enabled = True
 
1215
    def add_pipe(self, pipe):
 
1216
        # Call "handle_ipc" for both data and EOF events
 
1217
        gobject.io_add_watch(pipe, gobject.IO_IN | gobject.IO_HUP,
 
1218
                             self.handle_ipc)
 
1219
    def handle_ipc(self, source, condition, file_objects={}):
 
1220
        condition_names = {
 
1221
            gobject.IO_IN: u"IN",   # There is data to read.
 
1222
            gobject.IO_OUT: u"OUT", # Data can be written (without
 
1223
                                    # blocking).
 
1224
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
 
1225
            gobject.IO_ERR: u"ERR", # Error condition.
 
1226
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
 
1227
                                    # broken, usually for pipes and
 
1228
                                    # sockets).
 
1229
            }
 
1230
        conditions_string = ' | '.join(name
 
1231
                                       for cond, name in
 
1232
                                       condition_names.iteritems()
 
1233
                                       if cond & condition)
 
1234
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
 
1235
                     conditions_string)
 
1236
        
 
1237
        # Turn the pipe file descriptor into a Python file object
 
1238
        if source not in file_objects:
 
1239
            file_objects[source] = os.fdopen(source, u"r", 1)
 
1240
        
 
1241
        # Read a line from the file object
 
1242
        cmdline = file_objects[source].readline()
 
1243
        if not cmdline:             # Empty line means end of file
 
1244
            # close the IPC pipe
 
1245
            file_objects[source].close()
 
1246
            del file_objects[source]
 
1247
            
 
1248
            # Stop calling this function
 
1249
            return False
 
1250
        
 
1251
        logger.debug(u"IPC command: %r", cmdline)
 
1252
        
 
1253
        # Parse and act on command
 
1254
        cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
 
1255
        
 
1256
        if cmd == u"NOTFOUND":
 
1257
            logger.warning(u"Client not found for fingerprint: %s",
 
1258
                           args)
 
1259
            if self.use_dbus:
 
1260
                # Emit D-Bus signal
 
1261
                mandos_dbus_service.ClientNotFound(args)
 
1262
        elif cmd == u"INVALID":
 
1263
            for client in self.clients:
 
1264
                if client.name == args:
 
1265
                    logger.warning(u"Client %s is invalid", args)
 
1266
                    if self.use_dbus:
 
1267
                        # Emit D-Bus signal
 
1268
                        client.Rejected()
 
1269
                    break
 
1270
            else:
 
1271
                logger.error(u"Unknown client %s is invalid", args)
 
1272
        elif cmd == u"SENDING":
 
1273
            for client in self.clients:
 
1274
                if client.name == args:
 
1275
                    logger.info(u"Sending secret to %s", client.name)
 
1276
                    client.checked_ok()
 
1277
                    if self.use_dbus:
 
1278
                        # Emit D-Bus signal
 
1279
                        client.ReceivedSecret()
 
1280
                    break
 
1281
            else:
 
1282
                logger.error(u"Sending secret to unknown client %s",
 
1283
                             args)
 
1284
        else:
 
1285
            logger.error(u"Unknown IPC command: %r", cmdline)
 
1286
        
 
1287
        # Keep calling this function
 
1288
        return True
573
1289
 
574
1290
 
575
1291
def string_to_delta(interval):
576
1292
    """Parse a string and return a datetime.timedelta
577
 
 
578
 
    >>> string_to_delta('7d')
 
1293
    
 
1294
    >>> string_to_delta(u'7d')
579
1295
    datetime.timedelta(7)
580
 
    >>> string_to_delta('60s')
 
1296
    >>> string_to_delta(u'60s')
581
1297
    datetime.timedelta(0, 60)
582
 
    >>> string_to_delta('60m')
 
1298
    >>> string_to_delta(u'60m')
583
1299
    datetime.timedelta(0, 3600)
584
 
    >>> string_to_delta('24h')
 
1300
    >>> string_to_delta(u'24h')
585
1301
    datetime.timedelta(1)
586
1302
    >>> string_to_delta(u'1w')
587
1303
    datetime.timedelta(7)
588
 
    >>> string_to_delta('5m 30s')
 
1304
    >>> string_to_delta(u'5m 30s')
589
1305
    datetime.timedelta(0, 330)
590
1306
    """
591
1307
    timevalue = datetime.timedelta(0)
592
1308
    for s in interval.split():
593
1309
        try:
594
 
            suffix=unicode(s[-1])
595
 
            value=int(s[:-1])
 
1310
            suffix = unicode(s[-1])
 
1311
            value = int(s[:-1])
596
1312
            if suffix == u"d":
597
1313
                delta = datetime.timedelta(value)
598
1314
            elif suffix == u"s":
611
1327
    return timevalue
612
1328
 
613
1329
 
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
1330
def if_nametoindex(interface):
638
 
    """Call the C function if_nametoindex(), or equivalent"""
 
1331
    """Call the C function if_nametoindex(), or equivalent
 
1332
    
 
1333
    Note: This function cannot accept a unicode string."""
639
1334
    global if_nametoindex
640
1335
    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
 
1336
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1337
                          (ctypes.util.find_library(u"c"))
 
1338
                          .if_nametoindex)
645
1339
    except (OSError, AttributeError):
646
 
        if "struct" not in sys.modules:
647
 
            import struct
648
 
        if "fcntl" not in sys.modules:
649
 
            import fcntl
 
1340
        logger.warning(u"Doing if_nametoindex the hard way")
650
1341
        def if_nametoindex(interface):
651
1342
            "Get an interface index the hard way, i.e. using fcntl()"
652
1343
            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]
 
1344
            with closing(socket.socket()) as s:
 
1345
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1346
                                    struct.pack(str(u"16s16x"),
 
1347
                                                interface))
 
1348
            interface_index = struct.unpack(str(u"I"),
 
1349
                                            ifreq[16:20])[0]
658
1350
            return interface_index
659
1351
    return if_nametoindex(interface)
660
1352
 
661
1353
 
662
1354
def daemon(nochdir = False, noclose = False):
663
1355
    """See daemon(3).  Standard BSD Unix function.
 
1356
    
664
1357
    This should really exist as os.daemon, but it doesn't (yet)."""
665
1358
    if os.fork():
666
1359
        sys.exit()
667
1360
    os.setsid()
668
1361
    if not nochdir:
669
 
        os.chdir("/")
 
1362
        os.chdir(u"/")
670
1363
    if os.fork():
671
1364
        sys.exit()
672
1365
    if not noclose:
674
1367
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
675
1368
        if not stat.S_ISCHR(os.fstat(null).st_mode):
676
1369
            raise OSError(errno.ENODEV,
677
 
                          "/dev/null not a character device")
 
1370
                          u"/dev/null not a character device")
678
1371
        os.dup2(null, sys.stdin.fileno())
679
1372
        os.dup2(null, sys.stdout.fileno())
680
1373
        os.dup2(null, sys.stderr.fileno())
683
1376
 
684
1377
 
685
1378
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()
 
1379
    
 
1380
    ##################################################################
 
1381
    # Parsing of options, both command line and config file
 
1382
    
 
1383
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
1384
    parser.add_option("-i", u"--interface", type=u"string",
 
1385
                      metavar="IF", help=u"Bind to interface IF")
 
1386
    parser.add_option("-a", u"--address", type=u"string",
 
1387
                      help=u"Address to listen for requests on")
 
1388
    parser.add_option("-p", u"--port", type=u"int",
 
1389
                      help=u"Port number to receive requests on")
 
1390
    parser.add_option("--check", action=u"store_true",
 
1391
                      help=u"Run self-test")
 
1392
    parser.add_option("--debug", action=u"store_true",
 
1393
                      help=u"Debug mode; run in foreground and log to"
 
1394
                      u" terminal")
 
1395
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
 
1396
                      u" priority string (see GnuTLS documentation)")
 
1397
    parser.add_option("--servicename", type=u"string",
 
1398
                      metavar=u"NAME", help=u"Zeroconf service name")
 
1399
    parser.add_option("--configdir", type=u"string",
 
1400
                      default=u"/etc/mandos", metavar=u"DIR",
 
1401
                      help=u"Directory to search for configuration"
 
1402
                      u" files")
 
1403
    parser.add_option("--no-dbus", action=u"store_false",
 
1404
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
 
1405
                      u" system bus interface")
 
1406
    parser.add_option("--no-ipv6", action=u"store_false",
 
1407
                      dest=u"use_ipv6", help=u"Do not use IPv6")
 
1408
    options = parser.parse_args()[0]
710
1409
    
711
1410
    if options.check:
712
1411
        import doctest
714
1413
        sys.exit()
715
1414
    
716
1415
    # Default values for config file for server-global settings
717
 
    server_defaults = { "interface": "",
718
 
                        "address": "",
719
 
                        "port": "",
720
 
                        "debug": "False",
721
 
                        "priority":
722
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
723
 
                        "servicename": "Mandos",
 
1416
    server_defaults = { u"interface": u"",
 
1417
                        u"address": u"",
 
1418
                        u"port": u"",
 
1419
                        u"debug": u"False",
 
1420
                        u"priority":
 
1421
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
1422
                        u"servicename": u"Mandos",
 
1423
                        u"use_dbus": u"True",
 
1424
                        u"use_ipv6": u"True",
724
1425
                        }
725
1426
    
726
1427
    # Parse config file for server-global settings
727
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
1428
    server_config = configparser.SafeConfigParser(server_defaults)
728
1429
    del server_defaults
729
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
1430
    server_config.read(os.path.join(options.configdir,
 
1431
                                    u"mandos.conf"))
730
1432
    # Convert the SafeConfigParser object to a dict
731
1433
    server_settings = server_config.defaults()
732
 
    # Use getboolean on the boolean config option
733
 
    server_settings["debug"] = server_config.getboolean\
734
 
                               ("DEFAULT", "debug")
 
1434
    # Use the appropriate methods on the non-string config options
 
1435
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
 
1436
        server_settings[option] = server_config.getboolean(u"DEFAULT",
 
1437
                                                           option)
 
1438
    if server_settings["port"]:
 
1439
        server_settings["port"] = server_config.getint(u"DEFAULT",
 
1440
                                                       u"port")
735
1441
    del server_config
736
1442
    
737
1443
    # Override the settings from the config file with command line
738
1444
    # options, if set.
739
 
    for option in ("interface", "address", "port", "debug",
740
 
                   "priority", "servicename", "configdir"):
 
1445
    for option in (u"interface", u"address", u"port", u"debug",
 
1446
                   u"priority", u"servicename", u"configdir",
 
1447
                   u"use_dbus", u"use_ipv6"):
741
1448
        value = getattr(options, option)
742
1449
        if value is not None:
743
1450
            server_settings[option] = value
744
1451
    del options
 
1452
    # Force all strings to be unicode
 
1453
    for option in server_settings.keys():
 
1454
        if type(server_settings[option]) is str:
 
1455
            server_settings[option] = unicode(server_settings[option])
745
1456
    # Now we have our good server settings in "server_settings"
746
1457
    
747
 
    debug = server_settings["debug"]
 
1458
    ##################################################################
 
1459
    
 
1460
    # For convenience
 
1461
    debug = server_settings[u"debug"]
 
1462
    use_dbus = server_settings[u"use_dbus"]
 
1463
    use_ipv6 = server_settings[u"use_ipv6"]
748
1464
    
749
1465
    if not debug:
750
1466
        syslogger.setLevel(logging.WARNING)
751
1467
        console.setLevel(logging.WARNING)
752
1468
    
753
 
    if server_settings["servicename"] != "Mandos":
754
 
        syslogger.setFormatter(logging.Formatter\
755
 
                               ('Mandos (%s): %%(levelname)s:'
756
 
                                ' %%(message)s'
757
 
                                % server_settings["servicename"]))
 
1469
    if server_settings[u"servicename"] != u"Mandos":
 
1470
        syslogger.setFormatter(logging.Formatter
 
1471
                               (u'Mandos (%s) [%%(process)d]:'
 
1472
                                u' %%(levelname)s: %%(message)s'
 
1473
                                % server_settings[u"servicename"]))
758
1474
    
759
1475
    # Parse config file with clients
760
 
    client_defaults = { "timeout": "1h",
761
 
                        "interval": "5m",
762
 
                        "checker": "fping -q -- %(host)s",
763
 
                        "host": "",
 
1476
    client_defaults = { u"timeout": u"1h",
 
1477
                        u"interval": u"5m",
 
1478
                        u"checker": u"fping -q -- %%(host)s",
 
1479
                        u"host": u"",
764
1480
                        }
765
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
766
 
    client_config.read(os.path.join(server_settings["configdir"],
767
 
                                    "clients.conf"))
768
 
    
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
 
    pidfilename = "/var/run/mandos.pid"
776
 
    try:
777
 
        pidfile = open(pidfilename, "w")
778
 
    except IOError, error:
779
 
        logger.error("Could not open file %r", pidfilename)
780
 
    
781
 
    uid = 65534
782
 
    gid = 65534
783
 
    try:
784
 
        uid = pwd.getpwnam("mandos").pw_uid
785
 
    except KeyError:
786
 
        try:
787
 
            uid = pwd.getpwnam("nobody").pw_uid
788
 
        except KeyError:
789
 
            pass
790
 
    try:
791
 
        gid = pwd.getpwnam("mandos").pw_gid
792
 
    except KeyError:
793
 
        try:
794
 
            gid = pwd.getpwnam("nogroup").pw_gid
795
 
        except KeyError:
796
 
            pass
797
 
    try:
 
1481
    client_config = configparser.SafeConfigParser(client_defaults)
 
1482
    client_config.read(os.path.join(server_settings[u"configdir"],
 
1483
                                    u"clients.conf"))
 
1484
    
 
1485
    global mandos_dbus_service
 
1486
    mandos_dbus_service = None
 
1487
    
 
1488
    tcp_server = MandosServer((server_settings[u"address"],
 
1489
                               server_settings[u"port"]),
 
1490
                              ClientHandler,
 
1491
                              interface=server_settings[u"interface"],
 
1492
                              use_ipv6=use_ipv6,
 
1493
                              gnutls_priority=
 
1494
                              server_settings[u"priority"],
 
1495
                              use_dbus=use_dbus)
 
1496
    pidfilename = u"/var/run/mandos.pid"
 
1497
    try:
 
1498
        pidfile = open(pidfilename, u"w")
 
1499
    except IOError:
 
1500
        logger.error(u"Could not open file %r", pidfilename)
 
1501
    
 
1502
    try:
 
1503
        uid = pwd.getpwnam(u"_mandos").pw_uid
 
1504
        gid = pwd.getpwnam(u"_mandos").pw_gid
 
1505
    except KeyError:
 
1506
        try:
 
1507
            uid = pwd.getpwnam(u"mandos").pw_uid
 
1508
            gid = pwd.getpwnam(u"mandos").pw_gid
 
1509
        except KeyError:
 
1510
            try:
 
1511
                uid = pwd.getpwnam(u"nobody").pw_uid
 
1512
                gid = pwd.getpwnam(u"nobody").pw_gid
 
1513
            except KeyError:
 
1514
                uid = 65534
 
1515
                gid = 65534
 
1516
    try:
 
1517
        os.setgid(gid)
798
1518
        os.setuid(uid)
799
 
        os.setgid(gid)
800
1519
    except OSError, error:
801
1520
        if error[0] != errno.EPERM:
802
1521
            raise error
803
1522
    
804
 
    global service
805
 
    service = AvahiService(name = server_settings["servicename"],
806
 
                           type = "_mandos._tcp", );
807
 
    if server_settings["interface"]:
808
 
        service.interface = if_nametoindex\
809
 
                            (server_settings["interface"])
 
1523
    # Enable all possible GnuTLS debugging
 
1524
    if debug:
 
1525
        # "Use a log level over 10 to enable all debugging options."
 
1526
        # - GnuTLS manual
 
1527
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1528
        
 
1529
        @gnutls.library.types.gnutls_log_func
 
1530
        def debug_gnutls(level, string):
 
1531
            logger.debug(u"GnuTLS: %s", string[:-1])
 
1532
        
 
1533
        (gnutls.library.functions
 
1534
         .gnutls_global_set_log_function(debug_gnutls))
810
1535
    
811
1536
    global main_loop
812
 
    global bus
813
 
    global server
814
1537
    # From the Avahi example code
815
1538
    DBusGMainLoop(set_as_default=True )
816
1539
    main_loop = gobject.MainLoop()
817
1540
    bus = dbus.SystemBus()
818
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
819
 
                                           avahi.DBUS_PATH_SERVER),
820
 
                            avahi.DBUS_INTERFACE_SERVER)
821
1541
    # End of Avahi example code
822
 
    
823
 
    def remove_from_clients(client):
824
 
        clients.remove(client)
825
 
        if not clients:
826
 
            logger.critical(u"No clients left, exiting")
827
 
            sys.exit()
828
 
    
829
 
    clients.update(Set(Client(name = section,
830
 
                              stop_hook = remove_from_clients,
831
 
                              config
832
 
                              = dict(client_config.items(section)))
833
 
                       for section in client_config.sections()))
834
 
    if not clients:
835
 
        logger.critical(u"No clients defined")
836
 
        sys.exit(1)
 
1542
    if use_dbus:
 
1543
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1544
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1545
    service = AvahiService(name = server_settings[u"servicename"],
 
1546
                           servicetype = u"_mandos._tcp",
 
1547
                           protocol = protocol, bus = bus)
 
1548
    if server_settings["interface"]:
 
1549
        service.interface = (if_nametoindex
 
1550
                             (str(server_settings[u"interface"])))
 
1551
    
 
1552
    client_class = Client
 
1553
    if use_dbus:
 
1554
        client_class = functools.partial(ClientDBus, bus = bus)
 
1555
    tcp_server.clients.update(set(
 
1556
            client_class(name = section,
 
1557
                         config= dict(client_config.items(section)))
 
1558
            for section in client_config.sections()))
 
1559
    if not tcp_server.clients:
 
1560
        logger.warning(u"No clients defined")
837
1561
    
838
1562
    if debug:
839
1563
        # Redirect stdin so all checkers get /dev/null
848
1572
        daemon()
849
1573
    
850
1574
    try:
851
 
        pid = os.getpid()
852
 
        pidfile.write(str(pid) + "\n")
853
 
        pidfile.close()
 
1575
        with closing(pidfile):
 
1576
            pid = os.getpid()
 
1577
            pidfile.write(str(pid) + "\n")
854
1578
        del pidfile
855
 
    except IOError, err:
 
1579
    except IOError:
856
1580
        logger.error(u"Could not write to file %r with PID %d",
857
1581
                     pidfilename, pid)
858
1582
    except NameError:
862
1586
    
863
1587
    def cleanup():
864
1588
        "Cleanup function; run on exit"
865
 
        global group
866
 
        # From the Avahi example code
867
 
        if not group is None:
868
 
            group.Free()
869
 
            group = None
870
 
        # End of Avahi example code
 
1589
        service.cleanup()
871
1590
        
872
 
        while clients:
873
 
            client = clients.pop()
874
 
            client.stop_hook = None
875
 
            client.stop()
 
1591
        while tcp_server.clients:
 
1592
            client = tcp_server.clients.pop()
 
1593
            client.disable_hook = None
 
1594
            client.disable()
876
1595
    
877
1596
    atexit.register(cleanup)
878
1597
    
881
1600
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
882
1601
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
883
1602
    
884
 
    for client in clients:
885
 
        client.start()
 
1603
    if use_dbus:
 
1604
        class MandosDBusService(dbus.service.Object):
 
1605
            """A D-Bus proxy object"""
 
1606
            def __init__(self):
 
1607
                dbus.service.Object.__init__(self, bus, u"/")
 
1608
            _interface = u"se.bsnet.fukt.Mandos"
 
1609
            
 
1610
            @dbus.service.signal(_interface, signature=u"oa{sv}")
 
1611
            def ClientAdded(self, objpath, properties):
 
1612
                "D-Bus signal"
 
1613
                pass
 
1614
            
 
1615
            @dbus.service.signal(_interface, signature=u"s")
 
1616
            def ClientNotFound(self, fingerprint):
 
1617
                "D-Bus signal"
 
1618
                pass
 
1619
            
 
1620
            @dbus.service.signal(_interface, signature=u"os")
 
1621
            def ClientRemoved(self, objpath, name):
 
1622
                "D-Bus signal"
 
1623
                pass
 
1624
            
 
1625
            @dbus.service.method(_interface, out_signature=u"ao")
 
1626
            def GetAllClients(self):
 
1627
                "D-Bus method"
 
1628
                return dbus.Array(c.dbus_object_path
 
1629
                                  for c in tcp_server.clients)
 
1630
            
 
1631
            @dbus.service.method(_interface,
 
1632
                                 out_signature=u"a{oa{sv}}")
 
1633
            def GetAllClientsWithProperties(self):
 
1634
                "D-Bus method"
 
1635
                return dbus.Dictionary(
 
1636
                    ((c.dbus_object_path, c.GetAll(u""))
 
1637
                     for c in tcp_server.clients),
 
1638
                    signature=u"oa{sv}")
 
1639
            
 
1640
            @dbus.service.method(_interface, in_signature=u"o")
 
1641
            def RemoveClient(self, object_path):
 
1642
                "D-Bus method"
 
1643
                for c in tcp_server.clients:
 
1644
                    if c.dbus_object_path == object_path:
 
1645
                        tcp_server.clients.remove(c)
 
1646
                        c.remove_from_connection()
 
1647
                        # Don't signal anything except ClientRemoved
 
1648
                        c.disable(signal=False)
 
1649
                        # Emit D-Bus signal
 
1650
                        self.ClientRemoved(object_path, c.name)
 
1651
                        return
 
1652
                raise KeyError
 
1653
            
 
1654
            del _interface
 
1655
        
 
1656
        mandos_dbus_service = MandosDBusService()
 
1657
    
 
1658
    for client in tcp_server.clients:
 
1659
        if use_dbus:
 
1660
            # Emit D-Bus signal
 
1661
            mandos_dbus_service.ClientAdded(client.dbus_object_path,
 
1662
                                            client.GetAll(u""))
 
1663
        client.enable()
886
1664
    
887
1665
    tcp_server.enable()
888
1666
    tcp_server.server_activate()
889
1667
    
890
1668
    # Find out what port we got
891
1669
    service.port = tcp_server.socket.getsockname()[1]
892
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
893
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
1670
    if use_ipv6:
 
1671
        logger.info(u"Now listening on address %r, port %d,"
 
1672
                    " flowinfo %d, scope_id %d"
 
1673
                    % tcp_server.socket.getsockname())
 
1674
    else:                       # IPv4
 
1675
        logger.info(u"Now listening on address %r, port %d"
 
1676
                    % tcp_server.socket.getsockname())
894
1677
    
895
1678
    #service.interface = tcp_server.socket.getsockname()[3]
896
1679
    
897
1680
    try:
898
1681
        # From the Avahi example code
899
 
        server.connect_to_signal("StateChanged", server_state_changed)
900
1682
        try:
901
 
            server_state_changed(server.GetState())
 
1683
            service.activate()
902
1684
        except dbus.exceptions.DBusException, error:
903
1685
            logger.critical(u"DBusException: %s", error)
904
1686
            sys.exit(1)
906
1688
        
907
1689
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
908
1690
                             lambda *args, **kwargs:
909
 
                             tcp_server.handle_request\
910
 
                             (*args[2:], **kwargs) or True)
 
1691
                             (tcp_server.handle_request
 
1692
                              (*args[2:], **kwargs) or True))
911
1693
        
912
1694
        logger.debug(u"Starting main loop")
913
 
        main_loop_started = True
914
1695
        main_loop.run()
915
1696
    except AvahiError, error:
916
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
1697
        logger.critical(u"AvahiError: %s", error)
917
1698
        sys.exit(1)
918
1699
    except KeyboardInterrupt:
919
1700
        if debug:
920
 
            print
 
1701
            print >> sys.stderr
 
1702
        logger.debug(u"Server received KeyboardInterrupt")
 
1703
    logger.debug(u"Server exiting")
921
1704
 
922
1705
if __name__ == '__main__':
923
1706
    main()