/mandos/release

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Restore some poor D-Bus methods who got a bit hastily deleted.  Enable
writing to the "last_checked_ok" property.

* mandos (ClientDBus.CheckedOK, ClientDBus.Enable,
          ClientDBus.StartChecker, ClientDBus.Disable,
          ClientDBus.StopChecker): Restored.
  (ClientDBus.last_checked_ok_dbus_property): Make writing to this
                                              property do
                                              "self.checked_ok()".

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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
24
25
#     GNU General Public License for more details.
25
26
# 
26
27
# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
28
# along with this program.  If not, see
 
29
# <http://www.gnu.org/licenses/>.
28
30
# 
29
31
# Contact the authors at <mandos@fukt.bsnet.se>.
30
32
# 
31
33
 
32
 
from __future__ import division
 
34
from __future__ import division, with_statement, absolute_import
33
35
 
34
 
import SocketServer
 
36
import SocketServer as socketserver
35
37
import socket
36
 
import select
37
 
from optparse import OptionParser
 
38
import optparse
38
39
import datetime
39
40
import errno
40
41
import gnutls.crypto
43
44
import gnutls.library.functions
44
45
import gnutls.library.constants
45
46
import gnutls.library.types
46
 
import ConfigParser
 
47
import ConfigParser as configparser
47
48
import sys
48
49
import re
49
50
import os
50
51
import signal
51
 
from sets import Set
52
52
import subprocess
53
53
import atexit
54
54
import stat
55
55
import logging
56
56
import logging.handlers
 
57
import pwd
 
58
from contextlib import closing
 
59
import struct
 
60
import fcntl
 
61
import functools
57
62
 
58
63
import dbus
 
64
import dbus.service
59
65
import gobject
60
66
import avahi
61
67
from dbus.mainloop.glib import DBusGMainLoop
62
68
import ctypes
63
 
 
64
 
version = "1.0"
65
 
 
66
 
logger = logging.Logger('mandos')
67
 
syslogger = logging.handlers.SysLogHandler\
68
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
 
             address = "/dev/log")
70
 
syslogger.setFormatter(logging.Formatter\
71
 
                        ('Mandos: %(levelname)s: %(message)s'))
 
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'))
72
91
logger.addHandler(syslogger)
73
92
 
74
93
console = logging.StreamHandler()
75
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
 
                                       ' %(message)s'))
 
94
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
 
95
                                       u' %(levelname)s:'
 
96
                                       u' %(message)s'))
77
97
logger.addHandler(console)
78
98
 
79
99
class AvahiError(Exception):
80
 
    def __init__(self, value):
 
100
    def __init__(self, value, *args, **kwargs):
81
101
        self.value = value
82
 
    def __str__(self):
83
 
        return repr(self.value)
 
102
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
103
    def __unicode__(self):
 
104
        return unicode(repr(self.value))
84
105
 
85
106
class AvahiServiceError(AvahiError):
86
107
    pass
91
112
 
92
113
class AvahiService(object):
93
114
    """An Avahi (Zeroconf) service.
 
115
    
94
116
    Attributes:
95
117
    interface: integer; avahi.IF_UNSPEC or an interface index.
96
118
               Used to optionally bind to the specified interface.
97
 
    name: string; Example: 'Mandos'
98
 
    type: string; Example: '_mandos._tcp'.
 
119
    name: string; Example: u'Mandos'
 
120
    type: string; Example: u'_mandos._tcp'.
99
121
                  See <http://www.dns-sd.org/ServiceTypes.html>
100
122
    port: integer; what port to announce
101
123
    TXT: list of strings; TXT record for the service
104
126
    max_renames: integer; maximum number of renames
105
127
    rename_count: integer; counter so we only rename after collisions
106
128
                  a sensible number of times
 
129
    group: D-Bus Entry Group
 
130
    server: D-Bus Server
 
131
    bus: dbus.SystemBus()
107
132
    """
108
133
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
 
                 type = None, port = None, TXT = None, domain = "",
110
 
                 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):
111
137
        self.interface = interface
112
138
        self.name = name
113
 
        self.type = type
 
139
        self.type = servicetype
114
140
        self.port = port
115
 
        if TXT is None:
116
 
            self.TXT = []
117
 
        else:
118
 
            self.TXT = TXT
 
141
        self.TXT = TXT if TXT is not None else []
119
142
        self.domain = domain
120
143
        self.host = host
121
144
        self.rename_count = 0
122
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
123
150
    def rename(self):
124
151
        """Derived from the Avahi example code"""
125
152
        if self.rename_count >= self.max_renames:
126
 
            logger.critical(u"No suitable service name found after %i"
127
 
                            u" retries, exiting.", rename_count)
128
 
            raise AvahiServiceError("Too many renames")
129
 
        self.name = server.GetAlternativeServiceName(self.name)
130
 
        logger.info(u"Changing name to %r ...", str(self.name))
131
 
        syslogger.setFormatter(logging.Formatter\
132
 
                               ('Mandos (%s): %%(levelname)s:'
133
 
                               ' %%(message)s' % self.name))
 
153
            logger.critical(u"No suitable Zeroconf service name found"
 
154
                            u" after %i retries, exiting.",
 
155
                            self.rename_count)
 
156
            raise AvahiServiceError(u"Too many renames")
 
157
        self.name = self.server.GetAlternativeServiceName(self.name)
 
158
        logger.info(u"Changing Zeroconf service name to %r ...",
 
159
                    unicode(self.name))
 
160
        syslogger.setFormatter(logging.Formatter
 
161
                               (u'Mandos (%s) [%%(process)d]:'
 
162
                                u' %%(levelname)s: %%(message)s'
 
163
                                % self.name))
134
164
        self.remove()
135
165
        self.add()
136
166
        self.rename_count += 1
137
167
    def remove(self):
138
168
        """Derived from the Avahi example code"""
139
 
        if group is not None:
140
 
            group.Reset()
 
169
        if self.group is not None:
 
170
            self.group.Reset()
141
171
    def add(self):
142
172
        """Derived from the Avahi example code"""
143
 
        global group
144
 
        if group is None:
145
 
            group = dbus.Interface\
146
 
                    (bus.get_object(avahi.DBUS_NAME,
147
 
                                    server.EntryGroupNew()),
148
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
149
 
            group.connect_to_signal('StateChanged',
150
 
                                    entry_group_state_changed)
151
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
152
 
                     service.name, service.type)
153
 
        group.AddService(
154
 
                self.interface,         # interface
155
 
                avahi.PROTO_INET6,      # protocol
156
 
                dbus.UInt32(0),         # flags
157
 
                self.name, self.type,
158
 
                self.domain, self.host,
159
 
                dbus.UInt16(self.port),
160
 
                avahi.string_array_to_txt_array(self.TXT))
161
 
        group.Commit()
162
 
 
163
 
# From the Avahi example code:
164
 
group = None                            # our entry group
165
 
# End of Avahi example code
 
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)
 
181
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
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())
166
228
 
167
229
 
168
230
class Client(object):
169
231
    """A representation of a client host served by this server.
 
232
    
170
233
    Attributes:
171
 
    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
172
236
    fingerprint: string (40 or 32 hexadecimal digits); used to
173
237
                 uniquely identify the client
174
 
    secret:    bytestring; sent verbatim (over TLS) to client
175
 
    host:      string; available for use by the checker command
176
 
    created:   datetime.datetime(); object creation, not client host
177
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
178
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
179
 
                                     until this client is invalid
180
 
    interval:  datetime.timedelta(); How often to start a new checker
181
 
    stop_hook: If set, called by stop() as stop_hook(self)
182
 
    checker:   subprocess.Popen(); a running checker process used
183
 
                                   to see if the client lives.
184
 
                                   '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.
185
251
    checker_initiator_tag: a gobject event source tag, or None
186
 
    stop_initiator_tag:    - '' -
 
252
    disable_initiator_tag: - '' -
187
253
    checker_callback_tag:  - '' -
188
254
    checker_command: string; External command which is run to check if
189
255
                     client lives.  %() expansions are done at
190
256
                     runtime with vars(self) as dict, so that for
191
257
                     instance %(name)s can be used in the command.
192
 
    Private attibutes:
193
 
    _timeout: Real variable for 'timeout'
194
 
    _interval: Real variable for 'interval'
195
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
196
 
    _interval_milliseconds: - '' -
 
258
    current_checker_command: string; current running checker_command
197
259
    """
198
 
    def _set_timeout(self, timeout):
199
 
        "Setter function for 'timeout' attribute"
200
 
        self._timeout = timeout
201
 
        self._timeout_milliseconds = ((self.timeout.days
202
 
                                       * 24 * 60 * 60 * 1000)
203
 
                                      + (self.timeout.seconds * 1000)
204
 
                                      + (self.timeout.microseconds
205
 
                                         // 1000))
206
 
    timeout = property(lambda self: self._timeout,
207
 
                       _set_timeout)
208
 
    del _set_timeout
209
 
    def _set_interval(self, interval):
210
 
        "Setter function for 'interval' attribute"
211
 
        self._interval = interval
212
 
        self._interval_milliseconds = ((self.interval.days
213
 
                                        * 24 * 60 * 60 * 1000)
214
 
                                       + (self.interval.seconds
215
 
                                          * 1000)
216
 
                                       + (self.interval.microseconds
217
 
                                          // 1000))
218
 
    interval = property(lambda self: self._interval,
219
 
                        _set_interval)
220
 
    del _set_interval
221
 
    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):
222
277
        """Note: the 'checker' key in 'config' sets the
223
278
        'checker_command' attribute and *not* the 'checker'
224
279
        attribute."""
225
280
        self.name = name
 
281
        if config is None:
 
282
            config = {}
226
283
        logger.debug(u"Creating client %r", self.name)
227
284
        # Uppercase and remove spaces from fingerprint for later
228
285
        # comparison purposes with return value from the fingerprint()
229
286
        # function
230
 
        self.fingerprint = config["fingerprint"].upper()\
231
 
                           .replace(u" ", u"")
 
287
        self.fingerprint = (config[u"fingerprint"].upper()
 
288
                            .replace(u" ", u""))
232
289
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
233
 
        if "secret" in config:
234
 
            self.secret = config["secret"].decode(u"base64")
235
 
        elif "secfile" in config:
236
 
            sf = open(config["secfile"])
237
 
            self.secret = sf.read()
238
 
            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()
239
297
        else:
240
298
            raise TypeError(u"No secret or secfile for client %s"
241
299
                            % self.name)
242
 
        self.host = config.get("host", "")
243
 
        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
244
304
        self.last_checked_ok = None
245
 
        self.timeout = string_to_delta(config["timeout"])
246
 
        self.interval = string_to_delta(config["interval"])
247
 
        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
248
308
        self.checker = None
249
309
        self.checker_initiator_tag = None
250
 
        self.stop_initiator_tag = None
 
310
        self.disable_initiator_tag = None
251
311
        self.checker_callback_tag = None
252
 
        self.check_command = config["checker"]
253
 
    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):
254
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()
255
322
        # Schedule a new checker to be started an 'interval' from now,
256
323
        # and every interval from then on.
257
 
        self.checker_initiator_tag = gobject.timeout_add\
258
 
                                     (self._interval_milliseconds,
259
 
                                      self.start_checker)
 
324
        self.checker_initiator_tag = (gobject.timeout_add
 
325
                                      (self.interval_milliseconds(),
 
326
                                       self.start_checker))
260
327
        # Also start a new checker *right now*.
261
328
        self.start_checker()
262
 
        # Schedule a stop() when 'timeout' has passed
263
 
        self.stop_initiator_tag = gobject.timeout_add\
264
 
                                  (self._timeout_milliseconds,
265
 
                                   self.stop)
266
 
    def stop(self):
267
 
        """Stop this client.
268
 
        The possibility that a client might be restarted is left open,
269
 
        but not currently used."""
270
 
        # If this client doesn't have a secret, it is already stopped.
271
 
        if hasattr(self, "secret") and self.secret:
272
 
            logger.info(u"Stopping client %s", self.name)
273
 
            self.secret = None
274
 
        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):
275
338
            return False
276
 
        if getattr(self, "stop_initiator_tag", False):
277
 
            gobject.source_remove(self.stop_initiator_tag)
278
 
            self.stop_initiator_tag = None
279
 
        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):
280
344
            gobject.source_remove(self.checker_initiator_tag)
281
345
            self.checker_initiator_tag = None
282
346
        self.stop_checker()
283
 
        if self.stop_hook:
284
 
            self.stop_hook(self)
 
347
        if self.disable_hook:
 
348
            self.disable_hook(self)
 
349
        self.enabled = False
285
350
        # Do not run this again if called by a gobject.timeout_add
286
351
        return False
 
352
    
287
353
    def __del__(self):
288
 
        self.stop_hook = None
289
 
        self.stop()
290
 
    def checker_callback(self, pid, condition):
 
354
        self.disable_hook = None
 
355
        self.disable()
 
356
    
 
357
    def checker_callback(self, pid, condition, command):
291
358
        """The checker has completed, so take appropriate actions."""
292
 
        now = datetime.datetime.now()
293
359
        self.checker_callback_tag = None
294
360
        self.checker = None
295
 
        if os.WIFEXITED(condition) \
296
 
               and (os.WEXITSTATUS(condition) == 0):
297
 
            logger.info(u"Checker for %(name)s succeeded",
298
 
                        vars(self))
299
 
            self.last_checked_ok = now
300
 
            gobject.source_remove(self.stop_initiator_tag)
301
 
            self.stop_initiator_tag = gobject.timeout_add\
302
 
                                      (self._timeout_milliseconds,
303
 
                                       self.stop)
304
 
        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:
305
371
            logger.warning(u"Checker for %(name)s crashed?",
306
372
                           vars(self))
307
 
        else:
308
 
            logger.info(u"Checker for %(name)s failed",
309
 
                        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
    
310
386
    def start_checker(self):
311
387
        """Start a new checker subprocess if one is not running.
 
388
        
312
389
        If a checker already exists, leave it running and do
313
390
        nothing."""
314
391
        # The reason for not killing a running checker is that if we
319
396
        # checkers alone, the checker would have to take more time
320
397
        # than 'timeout' for the client to be declared invalid, which
321
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
322
409
        if self.checker is None:
323
410
            try:
324
 
                # In case check_command has exactly one % operator
325
 
                command = self.check_command % self.host
 
411
                # In case checker_command has exactly one % operator
 
412
                command = self.checker_command % self.host
326
413
            except TypeError:
327
414
                # Escape attributes for the shell
328
 
                escaped_attrs = dict((key, re.escape(str(val)))
 
415
                escaped_attrs = dict((key,
 
416
                                      re.escape(unicode(str(val),
 
417
                                                        errors=
 
418
                                                        u'replace')))
329
419
                                     for key, val in
330
420
                                     vars(self).iteritems())
331
421
                try:
332
 
                    command = self.check_command % escaped_attrs
 
422
                    command = self.checker_command % escaped_attrs
333
423
                except TypeError, error:
334
424
                    logger.error(u'Could not format string "%s":'
335
 
                                 u' %s', self.check_command, error)
 
425
                                 u' %s', self.checker_command, error)
336
426
                    return True # Try again later
 
427
            self.current_checker_command = command
337
428
            try:
338
429
                logger.info(u"Starting checker %r for %s",
339
430
                            command, self.name)
 
431
                # We don't need to redirect stdout and stderr, since
 
432
                # in normal mode, that is already done by daemon(),
 
433
                # and in debug mode we don't want to.  (Stdin is
 
434
                # always replaced by /dev/null.)
340
435
                self.checker = subprocess.Popen(command,
341
436
                                                close_fds=True,
342
 
                                                shell=True, cwd="/")
343
 
                self.checker_callback_tag = gobject.child_watch_add\
344
 
                                            (self.checker.pid,
345
 
                                             self.checker_callback)
346
 
            except subprocess.OSError, error:
 
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)
 
448
            except OSError, error:
347
449
                logger.error(u"Failed to start subprocess: %s",
348
450
                             error)
349
451
        # Re-run this periodically if run by gobject.timeout_add
350
452
        return True
 
453
    
351
454
    def stop_checker(self):
352
455
        """Force the checker process, if any, to stop."""
353
456
        if self.checker_callback_tag:
354
457
            gobject.source_remove(self.checker_callback_tag)
355
458
            self.checker_callback_tag = None
356
 
        if getattr(self, "checker", None) is None:
 
459
        if getattr(self, u"checker", None) is None:
357
460
            return
358
461
        logger.debug(u"Stopping checker for %(name)s", vars(self))
359
462
        try:
365
468
            if error.errno != errno.ESRCH: # No such process
366
469
                raise
367
470
        self.checker = None
 
471
    
368
472
    def still_valid(self):
369
473
        """Has the timeout not yet passed for this client?"""
370
 
        now = datetime.datetime.now()
 
474
        if not getattr(self, u"enabled", False):
 
475
            return False
 
476
        now = datetime.datetime.utcnow()
371
477
        if self.last_checked_ok is None:
372
478
            return now < (self.created + self.timeout)
373
479
        else:
374
480
            return now < (self.last_checked_ok + self.timeout)
375
481
 
376
482
 
377
 
def peer_certificate(session):
378
 
    "Return the peer's OpenPGP certificate as a bytestring"
379
 
    # If not an OpenPGP certificate...
380
 
    if gnutls.library.functions.gnutls_certificate_type_get\
381
 
            (session._c_object) \
382
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
383
 
        # ...do the normal thing
384
 
        return session.peer_certificate
385
 
    list_size = ctypes.c_uint()
386
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
387
 
        (session._c_object, ctypes.byref(list_size))
388
 
    if list_size.value == 0:
389
 
        return None
390
 
    cert = cert_list[0]
391
 
    return ctypes.string_at(cert.data, cert.size)
392
 
 
393
 
 
394
 
def fingerprint(openpgp):
395
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
396
 
    # New GnuTLS "datum" with the OpenPGP public key
397
 
    datum = gnutls.library.types.gnutls_datum_t\
398
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
399
 
                     ctypes.POINTER(ctypes.c_ubyte)),
400
 
         ctypes.c_uint(len(openpgp)))
401
 
    # New empty GnuTLS certificate
402
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
403
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
404
 
        (ctypes.byref(crt))
405
 
    # Import the OpenPGP public key into the certificate
406
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
407
 
                    (crt, ctypes.byref(datum),
408
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
409
 
    # New buffer for the fingerprint
410
 
    buffer = ctypes.create_string_buffer(20)
411
 
    buffer_length = ctypes.c_size_t()
412
 
    # Get the fingerprint from the certificate into the buffer
413
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
414
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
415
 
    # Deinit the certificate
416
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
417
 
    # Convert the buffer to a Python bytestring
418
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
419
 
    # Convert the bytestring to hexadecimal notation
420
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
421
 
    return hex_fpr
422
 
 
423
 
 
424
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
425
 
    """A TCP request handler class.
426
 
    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.
427
962
    Note: This will run in its own forked process."""
428
963
    
429
964
    def handle(self):
430
965
        logger.info(u"TCP connection from: %s",
431
 
                     unicode(self.client_address))
432
 
        session = gnutls.connection.ClientSession\
433
 
                  (self.request, gnutls.connection.X509Credentials())
434
 
        
435
 
        line = self.request.makefile().readline()
436
 
        logger.debug(u"Protocol version: %r", line)
437
 
        try:
438
 
            if int(line.strip().split()[0]) > 1:
439
 
                raise RuntimeError
440
 
        except (ValueError, IndexError, RuntimeError), error:
441
 
            logger.error(u"Unknown protocol version: %s", error)
442
 
            return
443
 
        
444
 
        # Note: gnutls.connection.X509Credentials is really a generic
445
 
        # GnuTLS certificate credentials object so long as no X.509
446
 
        # keys are added to it.  Therefore, we can use it here despite
447
 
        # using OpenPGP certificates.
448
 
        
449
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
450
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
451
 
        #                "+DHE-DSS"))
452
 
        priority = "NORMAL"             # Fallback default, since this
453
 
                                        # MUST be set.
454
 
        if self.server.settings["priority"]:
455
 
            priority = self.server.settings["priority"]
456
 
        gnutls.library.functions.gnutls_priority_set_direct\
457
 
            (session._c_object, priority, None);
458
 
        
459
 
        try:
460
 
            session.handshake()
461
 
        except gnutls.errors.GNUTLSError, error:
462
 
            logger.warning(u"Handshake failed: %s", error)
463
 
            # Do not run session.bye() here: the session is not
464
 
            # established.  Just abandon the request.
465
 
            return
466
 
        try:
467
 
            fpr = fingerprint(peer_certificate(session))
468
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
469
 
            logger.warning(u"Bad certificate: %s", error)
470
 
            session.bye()
471
 
            return
472
 
        logger.debug(u"Fingerprint: %s", fpr)
473
 
        client = None
474
 
        for c in self.server.clients:
475
 
            if c.fingerprint == fpr:
476
 
                client = c
477
 
                break
478
 
        if not client:
479
 
            logger.warning(u"Client not found for fingerprint: %s",
480
 
                           fpr)
481
 
            session.bye()
482
 
            return
483
 
        # Have to check if client.still_valid(), since it is possible
484
 
        # that the client timed out while establishing the GnuTLS
485
 
        # session.
486
 
        if not client.still_valid():
487
 
            logger.warning(u"Client %(name)s is invalid",
488
 
                           vars(client))
489
 
            session.bye()
490
 
            return
491
 
        sent_size = 0
492
 
        while sent_size < len(client.secret):
493
 
            sent = session.send(client.secret[sent_size:])
494
 
            logger.debug(u"Sent: %d, remaining: %d",
495
 
                         sent, len(client.secret)
496
 
                         - (sent_size + sent))
497
 
            sent_size += sent
498
 
        session.bye()
499
 
 
500
 
 
501
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
502
 
    """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
    
503
1128
    Attributes:
504
 
        settings:       Server settings
505
 
        clients:        Set() of Client objects
 
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
506
1132
    """
507
 
    address_family = socket.AF_INET6
508
 
    def __init__(self, *args, **kwargs):
509
 
        if "settings" in kwargs:
510
 
            self.settings = kwargs["settings"]
511
 
            del kwargs["settings"]
512
 
        if "clients" in kwargs:
513
 
            self.clients = kwargs["clients"]
514
 
            del kwargs["clients"]
515
 
        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)
516
1140
    def server_bind(self):
517
1141
        """This overrides the normal server_bind() function
518
1142
        to bind to an interface if one was specified, and also NOT to
519
1143
        bind to an address or port if they were not specified."""
520
 
        if self.settings["interface"]:
521
 
            # 25 is from /usr/include/asm-i486/socket.h
522
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
523
 
            try:
524
 
                self.socket.setsockopt(socket.SOL_SOCKET,
525
 
                                       SO_BINDTODEVICE,
526
 
                                       self.settings["interface"])
527
 
            except socket.error, error:
528
 
                if error[0] == errno.EPERM:
529
 
                    logger.error(u"No permission to"
530
 
                                 u" bind to interface %s",
531
 
                                 self.settings["interface"])
532
 
                else:
533
 
                    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
534
1166
        # Only bind(2) the socket if we really need to.
535
1167
        if self.server_address[0] or self.server_address[1]:
536
1168
            if not self.server_address[0]:
537
 
                in6addr_any = "::"
538
 
                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,
539
1174
                                       self.server_address[1])
540
1175
            elif not self.server_address[1]:
541
1176
                self.server_address = (self.server_address[0],
542
1177
                                       0)
543
 
#                 if self.settings["interface"]:
 
1178
#                 if self.interface:
544
1179
#                     self.server_address = (self.server_address[0],
545
1180
#                                            0, # port
546
1181
#                                            0, # flowinfo
547
1182
#                                            if_nametoindex
548
 
#                                            (self.settings
549
 
#                                             ["interface"]))
550
 
            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)
 
1210
    def server_activate(self):
 
1211
        if self.enabled:
 
1212
            return socketserver.TCPServer.server_activate(self)
 
1213
    def enable(self):
 
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
551
1289
 
552
1290
 
553
1291
def string_to_delta(interval):
554
1292
    """Parse a string and return a datetime.timedelta
555
 
 
556
 
    >>> string_to_delta('7d')
 
1293
    
 
1294
    >>> string_to_delta(u'7d')
557
1295
    datetime.timedelta(7)
558
 
    >>> string_to_delta('60s')
 
1296
    >>> string_to_delta(u'60s')
559
1297
    datetime.timedelta(0, 60)
560
 
    >>> string_to_delta('60m')
 
1298
    >>> string_to_delta(u'60m')
561
1299
    datetime.timedelta(0, 3600)
562
 
    >>> string_to_delta('24h')
 
1300
    >>> string_to_delta(u'24h')
563
1301
    datetime.timedelta(1)
564
1302
    >>> string_to_delta(u'1w')
565
1303
    datetime.timedelta(7)
 
1304
    >>> string_to_delta(u'5m 30s')
 
1305
    datetime.timedelta(0, 330)
566
1306
    """
567
 
    try:
568
 
        suffix=unicode(interval[-1])
569
 
        value=int(interval[:-1])
570
 
        if suffix == u"d":
571
 
            delta = datetime.timedelta(value)
572
 
        elif suffix == u"s":
573
 
            delta = datetime.timedelta(0, value)
574
 
        elif suffix == u"m":
575
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
576
 
        elif suffix == u"h":
577
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
578
 
        elif suffix == u"w":
579
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
580
 
        else:
 
1307
    timevalue = datetime.timedelta(0)
 
1308
    for s in interval.split():
 
1309
        try:
 
1310
            suffix = unicode(s[-1])
 
1311
            value = int(s[:-1])
 
1312
            if suffix == u"d":
 
1313
                delta = datetime.timedelta(value)
 
1314
            elif suffix == u"s":
 
1315
                delta = datetime.timedelta(0, value)
 
1316
            elif suffix == u"m":
 
1317
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
1318
            elif suffix == u"h":
 
1319
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
1320
            elif suffix == u"w":
 
1321
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
1322
            else:
 
1323
                raise ValueError
 
1324
        except (ValueError, IndexError):
581
1325
            raise ValueError
582
 
    except (ValueError, IndexError):
583
 
        raise ValueError
584
 
    return delta
585
 
 
586
 
 
587
 
def server_state_changed(state):
588
 
    """Derived from the Avahi example code"""
589
 
    if state == avahi.SERVER_COLLISION:
590
 
        logger.error(u"Server name collision")
591
 
        service.remove()
592
 
    elif state == avahi.SERVER_RUNNING:
593
 
        service.add()
594
 
 
595
 
 
596
 
def entry_group_state_changed(state, error):
597
 
    """Derived from the Avahi example code"""
598
 
    logger.debug(u"state change: %i", state)
599
 
    
600
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
601
 
        logger.debug(u"Service established.")
602
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
603
 
        logger.warning(u"Service name collision.")
604
 
        service.rename()
605
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
606
 
        logger.critical(u"Error in group state changed %s",
607
 
                        unicode(error))
608
 
        raise AvahiGroupError("State changed: %s", str(error))
 
1326
        timevalue += delta
 
1327
    return timevalue
 
1328
 
609
1329
 
610
1330
def if_nametoindex(interface):
611
 
    """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."""
612
1334
    global if_nametoindex
613
1335
    try:
614
 
        if "ctypes.util" not in sys.modules:
615
 
            import ctypes.util
616
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
617
 
            (ctypes.util.find_library("c")).if_nametoindex
 
1336
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1337
                          (ctypes.util.find_library(u"c"))
 
1338
                          .if_nametoindex)
618
1339
    except (OSError, AttributeError):
619
 
        if "struct" not in sys.modules:
620
 
            import struct
621
 
        if "fcntl" not in sys.modules:
622
 
            import fcntl
 
1340
        logger.warning(u"Doing if_nametoindex the hard way")
623
1341
        def if_nametoindex(interface):
624
1342
            "Get an interface index the hard way, i.e. using fcntl()"
625
1343
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
626
 
            s = socket.socket()
627
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
628
 
                                struct.pack("16s16x", interface))
629
 
            s.close()
630
 
            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]
631
1350
            return interface_index
632
1351
    return if_nametoindex(interface)
633
1352
 
634
1353
 
635
1354
def daemon(nochdir = False, noclose = False):
636
1355
    """See daemon(3).  Standard BSD Unix function.
 
1356
    
637
1357
    This should really exist as os.daemon, but it doesn't (yet)."""
638
1358
    if os.fork():
639
1359
        sys.exit()
640
1360
    os.setsid()
641
1361
    if not nochdir:
642
 
        os.chdir("/")
 
1362
        os.chdir(u"/")
643
1363
    if os.fork():
644
1364
        sys.exit()
645
1365
    if not noclose:
647
1367
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
648
1368
        if not stat.S_ISCHR(os.fstat(null).st_mode):
649
1369
            raise OSError(errno.ENODEV,
650
 
                          "/dev/null not a character device")
 
1370
                          u"/dev/null not a character device")
651
1371
        os.dup2(null, sys.stdin.fileno())
652
1372
        os.dup2(null, sys.stdout.fileno())
653
1373
        os.dup2(null, sys.stderr.fileno())
656
1376
 
657
1377
 
658
1378
def main():
659
 
    global main_loop_started
660
 
    main_loop_started = False
661
 
    
662
 
    parser = OptionParser(version = "%%prog %s" % version)
663
 
    parser.add_option("-i", "--interface", type="string",
664
 
                      metavar="IF", help="Bind to interface IF")
665
 
    parser.add_option("-a", "--address", type="string",
666
 
                      help="Address to listen for requests on")
667
 
    parser.add_option("-p", "--port", type="int",
668
 
                      help="Port number to receive requests on")
669
 
    parser.add_option("--check", action="store_true", default=False,
670
 
                      help="Run self-test")
671
 
    parser.add_option("--debug", action="store_true",
672
 
                      help="Debug mode; run in foreground and log to"
673
 
                      " terminal")
674
 
    parser.add_option("--priority", type="string", help="GnuTLS"
675
 
                      " priority string (see GnuTLS documentation)")
676
 
    parser.add_option("--servicename", type="string", metavar="NAME",
677
 
                      help="Zeroconf service name")
678
 
    parser.add_option("--configdir", type="string",
679
 
                      default="/etc/mandos", metavar="DIR",
680
 
                      help="Directory to search for configuration"
681
 
                      " files")
682
 
    (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]
683
1409
    
684
1410
    if options.check:
685
1411
        import doctest
687
1413
        sys.exit()
688
1414
    
689
1415
    # Default values for config file for server-global settings
690
 
    server_defaults = { "interface": "",
691
 
                        "address": "",
692
 
                        "port": "",
693
 
                        "debug": "False",
694
 
                        "priority":
695
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
696
 
                        "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",
697
1425
                        }
698
1426
    
699
1427
    # Parse config file for server-global settings
700
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
1428
    server_config = configparser.SafeConfigParser(server_defaults)
701
1429
    del server_defaults
702
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
1430
    server_config.read(os.path.join(options.configdir,
 
1431
                                    u"mandos.conf"))
703
1432
    # Convert the SafeConfigParser object to a dict
704
1433
    server_settings = server_config.defaults()
705
 
    # Use getboolean on the boolean config option
706
 
    server_settings["debug"] = server_config.getboolean\
707
 
                               ("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")
708
1441
    del server_config
709
1442
    
710
1443
    # Override the settings from the config file with command line
711
1444
    # options, if set.
712
 
    for option in ("interface", "address", "port", "debug",
713
 
                   "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"):
714
1448
        value = getattr(options, option)
715
1449
        if value is not None:
716
1450
            server_settings[option] = value
717
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])
718
1456
    # Now we have our good server settings in "server_settings"
719
1457
    
720
 
    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"]
721
1464
    
722
1465
    if not debug:
723
1466
        syslogger.setLevel(logging.WARNING)
724
1467
        console.setLevel(logging.WARNING)
725
1468
    
726
 
    if server_settings["servicename"] != "Mandos":
727
 
        syslogger.setFormatter(logging.Formatter\
728
 
                               ('Mandos (%s): %%(levelname)s:'
729
 
                                ' %%(message)s'
730
 
                                % 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"]))
731
1474
    
732
1475
    # Parse config file with clients
733
 
    client_defaults = { "timeout": "1h",
734
 
                        "interval": "5m",
735
 
                        "checker": "fping -q -- %%(host)s",
 
1476
    client_defaults = { u"timeout": u"1h",
 
1477
                        u"interval": u"5m",
 
1478
                        u"checker": u"fping -q -- %%(host)s",
 
1479
                        u"host": u"",
736
1480
                        }
737
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
738
 
    client_config.read(os.path.join(server_settings["configdir"],
739
 
                                    "clients.conf"))
740
 
    
741
 
    global service
742
 
    service = AvahiService(name = server_settings["servicename"],
743
 
                           type = "_mandos._tcp", );
744
 
    if server_settings["interface"]:
745
 
        service.interface = if_nametoindex(server_settings["interface"])
 
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)
 
1518
        os.setuid(uid)
 
1519
    except OSError, error:
 
1520
        if error[0] != errno.EPERM:
 
1521
            raise error
 
1522
    
 
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))
746
1535
    
747
1536
    global main_loop
748
 
    global bus
749
 
    global server
750
1537
    # From the Avahi example code
751
1538
    DBusGMainLoop(set_as_default=True )
752
1539
    main_loop = gobject.MainLoop()
753
1540
    bus = dbus.SystemBus()
754
 
    server = dbus.Interface(
755
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
 
            avahi.DBUS_INTERFACE_SERVER )
757
1541
    # End of Avahi example code
758
 
    
759
 
    clients = Set()
760
 
    def remove_from_clients(client):
761
 
        clients.remove(client)
762
 
        if not clients:
763
 
            logger.critical(u"No clients left, exiting")
764
 
            sys.exit()
765
 
    
766
 
    clients.update(Set(Client(name = section,
767
 
                              stop_hook = remove_from_clients,
768
 
                              config
769
 
                              = dict(client_config.items(section)))
770
 
                       for section in client_config.sections()))
771
 
    if not clients:
772
 
        logger.critical(u"No clients defined")
773
 
        sys.exit(1)
774
 
    
775
 
    if not debug:
 
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")
 
1561
    
 
1562
    if debug:
 
1563
        # Redirect stdin so all checkers get /dev/null
 
1564
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1565
        os.dup2(null, sys.stdin.fileno())
 
1566
        if null > 2:
 
1567
            os.close(null)
 
1568
    else:
 
1569
        # No console logging
776
1570
        logger.removeHandler(console)
 
1571
        # Close all input and output, do double fork, etc.
777
1572
        daemon()
778
1573
    
779
 
    pidfilename = "/var/run/mandos/mandos.pid"
780
 
    pid = os.getpid()
781
1574
    try:
782
 
        pidfile = open(pidfilename, "w")
783
 
        pidfile.write(str(pid) + "\n")
784
 
        pidfile.close()
 
1575
        with closing(pidfile):
 
1576
            pid = os.getpid()
 
1577
            pidfile.write(str(pid) + "\n")
785
1578
        del pidfile
786
 
    except IOError, err:
787
 
        logger.error(u"Could not write %s file with PID %d",
788
 
                     pidfilename, os.getpid())
 
1579
    except IOError:
 
1580
        logger.error(u"Could not write to file %r with PID %d",
 
1581
                     pidfilename, pid)
 
1582
    except NameError:
 
1583
        # "pidfile" was never created
 
1584
        pass
 
1585
    del pidfilename
789
1586
    
790
1587
    def cleanup():
791
1588
        "Cleanup function; run on exit"
792
 
        global group
793
 
        # From the Avahi example code
794
 
        if not group is None:
795
 
            group.Free()
796
 
            group = None
797
 
        # End of Avahi example code
 
1589
        service.cleanup()
798
1590
        
799
 
        while clients:
800
 
            client = clients.pop()
801
 
            client.stop_hook = None
802
 
            client.stop()
 
1591
        while tcp_server.clients:
 
1592
            client = tcp_server.clients.pop()
 
1593
            client.disable_hook = None
 
1594
            client.disable()
803
1595
    
804
1596
    atexit.register(cleanup)
805
1597
    
808
1600
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
809
1601
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
810
1602
    
811
 
    for client in clients:
812
 
        client.start()
813
 
    
814
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
815
 
                                 server_settings["port"]),
816
 
                                tcp_handler,
817
 
                                settings=server_settings,
818
 
                                clients=clients)
 
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()
 
1664
    
 
1665
    tcp_server.enable()
 
1666
    tcp_server.server_activate()
 
1667
    
819
1668
    # Find out what port we got
820
1669
    service.port = tcp_server.socket.getsockname()[1]
821
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
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())
823
1677
    
824
1678
    #service.interface = tcp_server.socket.getsockname()[3]
825
1679
    
826
1680
    try:
827
1681
        # From the Avahi example code
828
 
        server.connect_to_signal("StateChanged", server_state_changed)
829
1682
        try:
830
 
            server_state_changed(server.GetState())
 
1683
            service.activate()
831
1684
        except dbus.exceptions.DBusException, error:
832
1685
            logger.critical(u"DBusException: %s", error)
833
1686
            sys.exit(1)
835
1688
        
836
1689
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
1690
                             lambda *args, **kwargs:
838
 
                             tcp_server.handle_request\
839
 
                             (*args[2:], **kwargs) or True)
 
1691
                             (tcp_server.handle_request
 
1692
                              (*args[2:], **kwargs) or True))
840
1693
        
841
1694
        logger.debug(u"Starting main loop")
842
 
        main_loop_started = True
843
1695
        main_loop.run()
844
1696
    except AvahiError, error:
845
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
1697
        logger.critical(u"AvahiError: %s", error)
846
1698
        sys.exit(1)
847
1699
    except KeyboardInterrupt:
848
1700
        if debug:
849
 
            print
 
1701
            print >> sys.stderr
 
1702
        logger.debug(u"Server received KeyboardInterrupt")
 
1703
    logger.debug(u"Server exiting")
850
1704
 
851
1705
if __name__ == '__main__':
852
1706
    main()