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  • Committer: Teddy Hogeborn
  • Date: 2008-09-13 19:20:50 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080913192050-gxuo0jv4o25jn848
* TODO: Minor changes.

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Lines of Context:
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# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
 
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".
12
12
13
13
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
31
30
# Contact the authors at <mandos@fukt.bsnet.se>.
32
31
33
32
 
34
 
from __future__ import division, with_statement, absolute_import
 
33
from __future__ import division
35
34
 
36
 
import SocketServer as socketserver
 
35
import SocketServer
37
36
import socket
38
 
import optparse
 
37
import select
 
38
from optparse import OptionParser
39
39
import datetime
40
40
import errno
41
41
import gnutls.crypto
44
44
import gnutls.library.functions
45
45
import gnutls.library.constants
46
46
import gnutls.library.types
47
 
import ConfigParser as configparser
 
47
import ConfigParser
48
48
import sys
49
49
import re
50
50
import os
51
51
import signal
 
52
from sets import Set
52
53
import subprocess
53
54
import atexit
54
55
import stat
55
56
import logging
56
57
import logging.handlers
57
58
import pwd
58
 
import contextlib
59
 
import struct
60
 
import fcntl
61
 
import functools
62
 
import cPickle as pickle
63
 
import multiprocessing
64
59
 
65
60
import dbus
66
 
import dbus.service
67
61
import gobject
68
62
import avahi
69
63
from dbus.mainloop.glib import DBusGMainLoop
70
64
import ctypes
71
 
import ctypes.util
72
 
import xml.dom.minidom
73
 
import inspect
74
 
 
75
 
try:
76
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
77
 
except AttributeError:
78
 
    try:
79
 
        from IN import SO_BINDTODEVICE
80
 
    except ImportError:
81
 
        SO_BINDTODEVICE = None
82
 
 
83
 
 
84
 
version = "1.0.14"
85
 
 
86
 
#logger = logging.getLogger(u'mandos')
87
 
logger = logging.Logger(u'mandos')
88
 
syslogger = (logging.handlers.SysLogHandler
89
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
90
 
              address = "/dev/log"))
91
 
syslogger.setFormatter(logging.Formatter
92
 
                       (u'Mandos [%(process)d]: %(levelname)s:'
93
 
                        u' %(message)s'))
 
65
 
 
66
version = "1.0"
 
67
 
 
68
logger = logging.Logger('mandos')
 
69
syslogger = logging.handlers.SysLogHandler\
 
70
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
71
             address = "/dev/log")
 
72
syslogger.setFormatter(logging.Formatter\
 
73
                        ('Mandos: %(levelname)s: %(message)s'))
94
74
logger.addHandler(syslogger)
95
75
 
96
76
console = logging.StreamHandler()
97
 
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
98
 
                                       u' %(levelname)s:'
99
 
                                       u' %(message)s'))
 
77
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
 
78
                                       ' %(message)s'))
100
79
logger.addHandler(console)
101
80
 
102
81
class AvahiError(Exception):
103
 
    def __init__(self, value, *args, **kwargs):
 
82
    def __init__(self, value):
104
83
        self.value = value
105
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
106
 
    def __unicode__(self):
107
 
        return unicode(repr(self.value))
 
84
    def __str__(self):
 
85
        return repr(self.value)
108
86
 
109
87
class AvahiServiceError(AvahiError):
110
88
    pass
115
93
 
116
94
class AvahiService(object):
117
95
    """An Avahi (Zeroconf) service.
118
 
    
119
96
    Attributes:
120
97
    interface: integer; avahi.IF_UNSPEC or an interface index.
121
98
               Used to optionally bind to the specified interface.
122
 
    name: string; Example: u'Mandos'
123
 
    type: string; Example: u'_mandos._tcp'.
 
99
    name: string; Example: 'Mandos'
 
100
    type: string; Example: '_mandos._tcp'.
124
101
                  See <http://www.dns-sd.org/ServiceTypes.html>
125
102
    port: integer; what port to announce
126
103
    TXT: list of strings; TXT record for the service
129
106
    max_renames: integer; maximum number of renames
130
107
    rename_count: integer; counter so we only rename after collisions
131
108
                  a sensible number of times
132
 
    group: D-Bus Entry Group
133
 
    server: D-Bus Server
134
 
    bus: dbus.SystemBus()
135
109
    """
136
110
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
137
 
                 servicetype = None, port = None, TXT = None,
138
 
                 domain = u"", host = u"", max_renames = 32768,
139
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
 
111
                 type = None, port = None, TXT = None, domain = "",
 
112
                 host = "", max_renames = 32768):
140
113
        self.interface = interface
141
114
        self.name = name
142
 
        self.type = servicetype
 
115
        self.type = type
143
116
        self.port = port
144
 
        self.TXT = TXT if TXT is not None else []
 
117
        if TXT is None:
 
118
            self.TXT = []
 
119
        else:
 
120
            self.TXT = TXT
145
121
        self.domain = domain
146
122
        self.host = host
147
123
        self.rename_count = 0
148
124
        self.max_renames = max_renames
149
 
        self.protocol = protocol
150
 
        self.group = None       # our entry group
151
 
        self.server = None
152
 
        self.bus = bus
153
125
    def rename(self):
154
126
        """Derived from the Avahi example code"""
155
127
        if self.rename_count >= self.max_renames:
156
128
            logger.critical(u"No suitable Zeroconf service name found"
157
129
                            u" after %i retries, exiting.",
158
 
                            self.rename_count)
159
 
            raise AvahiServiceError(u"Too many renames")
160
 
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
 
130
                            rename_count)
 
131
            raise AvahiServiceError("Too many renames")
 
132
        self.name = server.GetAlternativeServiceName(self.name)
161
133
        logger.info(u"Changing Zeroconf service name to %r ...",
162
 
                    self.name)
163
 
        syslogger.setFormatter(logging.Formatter
164
 
                               (u'Mandos (%s) [%%(process)d]:'
165
 
                                u' %%(levelname)s: %%(message)s'
166
 
                                % self.name))
 
134
                    str(self.name))
 
135
        syslogger.setFormatter(logging.Formatter\
 
136
                               ('Mandos (%s): %%(levelname)s:'
 
137
                               ' %%(message)s' % self.name))
167
138
        self.remove()
168
 
        try:
169
 
            self.add()
170
 
        except dbus.exceptions.DBusException, error:
171
 
            logger.critical(u"DBusException: %s", error)
172
 
            self.cleanup()
173
 
            os._exit(1)
 
139
        self.add()
174
140
        self.rename_count += 1
175
141
    def remove(self):
176
142
        """Derived from the Avahi example code"""
177
 
        if self.group is not None:
178
 
            self.group.Reset()
 
143
        if group is not None:
 
144
            group.Reset()
179
145
    def add(self):
180
146
        """Derived from the Avahi example code"""
181
 
        if self.group is None:
182
 
            self.group = dbus.Interface(
183
 
                self.bus.get_object(avahi.DBUS_NAME,
184
 
                                    self.server.EntryGroupNew()),
185
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
186
 
            self.group.connect_to_signal('StateChanged',
187
 
                                         self
188
 
                                         .entry_group_state_changed)
 
147
        global group
 
148
        if group is None:
 
149
            group = dbus.Interface\
 
150
                    (bus.get_object(avahi.DBUS_NAME,
 
151
                                    server.EntryGroupNew()),
 
152
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
153
            group.connect_to_signal('StateChanged',
 
154
                                    entry_group_state_changed)
189
155
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
190
 
                     self.name, self.type)
191
 
        self.group.AddService(
192
 
            self.interface,
193
 
            self.protocol,
194
 
            dbus.UInt32(0),     # flags
195
 
            self.name, self.type,
196
 
            self.domain, self.host,
197
 
            dbus.UInt16(self.port),
198
 
            avahi.string_array_to_txt_array(self.TXT))
199
 
        self.group.Commit()
200
 
    def entry_group_state_changed(self, state, error):
201
 
        """Derived from the Avahi example code"""
202
 
        logger.debug(u"Avahi entry group state change: %i", state)
203
 
        
204
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
205
 
            logger.debug(u"Zeroconf service established.")
206
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
207
 
            logger.warning(u"Zeroconf service name collision.")
208
 
            self.rename()
209
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
210
 
            logger.critical(u"Avahi: Error in group state changed %s",
211
 
                            unicode(error))
212
 
            raise AvahiGroupError(u"State changed: %s"
213
 
                                  % unicode(error))
214
 
    def cleanup(self):
215
 
        """Derived from the Avahi example code"""
216
 
        if self.group is not None:
217
 
            self.group.Free()
218
 
            self.group = None
219
 
    def server_state_changed(self, state):
220
 
        """Derived from the Avahi example code"""
221
 
        logger.debug(u"Avahi server state change: %i", state)
222
 
        if state == avahi.SERVER_COLLISION:
223
 
            logger.error(u"Zeroconf server name collision")
224
 
            self.remove()
225
 
        elif state == avahi.SERVER_RUNNING:
226
 
            self.add()
227
 
    def activate(self):
228
 
        """Derived from the Avahi example code"""
229
 
        if self.server is None:
230
 
            self.server = dbus.Interface(
231
 
                self.bus.get_object(avahi.DBUS_NAME,
232
 
                                    avahi.DBUS_PATH_SERVER),
233
 
                avahi.DBUS_INTERFACE_SERVER)
234
 
        self.server.connect_to_signal(u"StateChanged",
235
 
                                 self.server_state_changed)
236
 
        self.server_state_changed(self.server.GetState())
 
156
                     service.name, service.type)
 
157
        group.AddService(
 
158
                self.interface,         # interface
 
159
                avahi.PROTO_INET6,      # protocol
 
160
                dbus.UInt32(0),         # flags
 
161
                self.name, self.type,
 
162
                self.domain, self.host,
 
163
                dbus.UInt16(self.port),
 
164
                avahi.string_array_to_txt_array(self.TXT))
 
165
        group.Commit()
 
166
 
 
167
# From the Avahi example code:
 
168
group = None                            # our entry group
 
169
# End of Avahi example code
237
170
 
238
171
 
239
172
class Client(object):
240
173
    """A representation of a client host served by this server.
241
 
    
242
174
    Attributes:
243
 
    _approved:   bool(); 'None' if not yet approved/disapproved
244
 
    approval_delay: datetime.timedelta(); Time to wait for approval
245
 
    approval_duration: datetime.timedelta(); Duration of one approval
246
 
    checker:    subprocess.Popen(); a running checker process used
247
 
                                    to see if the client lives.
248
 
                                    'None' if no process is running.
 
175
    name:      string; from the config file, used in log messages
 
176
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
177
                 uniquely identify the client
 
178
    secret:    bytestring; sent verbatim (over TLS) to client
 
179
    host:      string; available for use by the checker command
 
180
    created:   datetime.datetime(); object creation, not client host
 
181
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
182
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
183
                                     until this client is invalid
 
184
    interval:  datetime.timedelta(); How often to start a new checker
 
185
    stop_hook: If set, called by stop() as stop_hook(self)
 
186
    checker:   subprocess.Popen(); a running checker process used
 
187
                                   to see if the client lives.
 
188
                                   'None' if no process is running.
 
189
    checker_initiator_tag: a gobject event source tag, or None
 
190
    stop_initiator_tag:    - '' -
249
191
    checker_callback_tag:  - '' -
250
 
    checker_command: string; External command which is run to check
251
 
                     if client lives.  %() expansions are done at
 
192
    checker_command: string; External command which is run to check if
 
193
                     client lives.  %() expansions are done at
252
194
                     runtime with vars(self) as dict, so that for
253
195
                     instance %(name)s can be used in the command.
254
 
    checker_initiator_tag: a gobject event source tag, or None
255
 
    created:    datetime.datetime(); (UTC) object creation
256
 
    current_checker_command: string; current running checker_command
257
 
    disable_hook:  If set, called by disable() as disable_hook(self)
258
 
    disable_initiator_tag: - '' -
259
 
    enabled:    bool()
260
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
261
 
                 uniquely identify the client
262
 
    host:       string; available for use by the checker command
263
 
    interval:   datetime.timedelta(); How often to start a new checker
264
 
    last_checked_ok: datetime.datetime(); (UTC) or None
265
 
    last_enabled: datetime.datetime(); (UTC)
266
 
    name:       string; from the config file, used in log messages and
267
 
                        D-Bus identifiers
268
 
    secret:     bytestring; sent verbatim (over TLS) to client
269
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
270
 
                                      until this client is disabled
271
 
    runtime_expansions: Allowed attributes for runtime expansion.
 
196
    Private attibutes:
 
197
    _timeout: Real variable for 'timeout'
 
198
    _interval: Real variable for 'interval'
 
199
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
200
    _interval_milliseconds: - '' -
272
201
    """
273
 
    
274
 
    runtime_expansions = (u"approval_delay", u"approval_duration",
275
 
                          u"created", u"enabled", u"fingerprint",
276
 
                          u"host", u"interval", u"last_checked_ok",
277
 
                          u"last_enabled", u"name", u"timeout")
278
 
    
279
 
    @staticmethod
280
 
    def _timedelta_to_milliseconds(td):
281
 
        "Convert a datetime.timedelta() to milliseconds"
282
 
        return ((td.days * 24 * 60 * 60 * 1000)
283
 
                + (td.seconds * 1000)
284
 
                + (td.microseconds // 1000))
285
 
    
286
 
    def timeout_milliseconds(self):
287
 
        "Return the 'timeout' attribute in milliseconds"
288
 
        return self._timedelta_to_milliseconds(self.timeout)
289
 
    
290
 
    def interval_milliseconds(self):
291
 
        "Return the 'interval' attribute in milliseconds"
292
 
        return self._timedelta_to_milliseconds(self.interval)
293
 
 
294
 
    def approval_delay_milliseconds(self):
295
 
        return self._timedelta_to_milliseconds(self.approval_delay)
296
 
    
297
 
    def __init__(self, name = None, disable_hook=None, config=None):
 
202
    def _set_timeout(self, timeout):
 
203
        "Setter function for 'timeout' attribute"
 
204
        self._timeout = timeout
 
205
        self._timeout_milliseconds = ((self.timeout.days
 
206
                                       * 24 * 60 * 60 * 1000)
 
207
                                      + (self.timeout.seconds * 1000)
 
208
                                      + (self.timeout.microseconds
 
209
                                         // 1000))
 
210
    timeout = property(lambda self: self._timeout,
 
211
                       _set_timeout)
 
212
    del _set_timeout
 
213
    def _set_interval(self, interval):
 
214
        "Setter function for 'interval' attribute"
 
215
        self._interval = interval
 
216
        self._interval_milliseconds = ((self.interval.days
 
217
                                        * 24 * 60 * 60 * 1000)
 
218
                                       + (self.interval.seconds
 
219
                                          * 1000)
 
220
                                       + (self.interval.microseconds
 
221
                                          // 1000))
 
222
    interval = property(lambda self: self._interval,
 
223
                        _set_interval)
 
224
    del _set_interval
 
225
    def __init__(self, name = None, stop_hook=None, config={}):
298
226
        """Note: the 'checker' key in 'config' sets the
299
227
        'checker_command' attribute and *not* the 'checker'
300
228
        attribute."""
301
229
        self.name = name
302
 
        if config is None:
303
 
            config = {}
304
230
        logger.debug(u"Creating client %r", self.name)
305
231
        # Uppercase and remove spaces from fingerprint for later
306
232
        # comparison purposes with return value from the fingerprint()
307
233
        # function
308
 
        self.fingerprint = (config[u"fingerprint"].upper()
309
 
                            .replace(u" ", u""))
 
234
        self.fingerprint = config["fingerprint"].upper()\
 
235
                           .replace(u" ", u"")
310
236
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
311
 
        if u"secret" in config:
312
 
            self.secret = config[u"secret"].decode(u"base64")
313
 
        elif u"secfile" in config:
314
 
            with open(os.path.expanduser(os.path.expandvars
315
 
                                         (config[u"secfile"])),
316
 
                      "rb") as secfile:
317
 
                self.secret = secfile.read()
 
237
        if "secret" in config:
 
238
            self.secret = config["secret"].decode(u"base64")
 
239
        elif "secfile" in config:
 
240
            sf = open(config["secfile"])
 
241
            self.secret = sf.read()
 
242
            sf.close()
318
243
        else:
319
244
            raise TypeError(u"No secret or secfile for client %s"
320
245
                            % self.name)
321
 
        self.host = config.get(u"host", u"")
322
 
        self.created = datetime.datetime.utcnow()
323
 
        self.enabled = False
324
 
        self.last_enabled = None
 
246
        self.host = config.get("host", "")
 
247
        self.created = datetime.datetime.now()
325
248
        self.last_checked_ok = None
326
 
        self.timeout = string_to_delta(config[u"timeout"])
327
 
        self.interval = string_to_delta(config[u"interval"])
328
 
        self.disable_hook = disable_hook
 
249
        self.timeout = string_to_delta(config["timeout"])
 
250
        self.interval = string_to_delta(config["interval"])
 
251
        self.stop_hook = stop_hook
329
252
        self.checker = None
330
253
        self.checker_initiator_tag = None
331
 
        self.disable_initiator_tag = None
 
254
        self.stop_initiator_tag = None
332
255
        self.checker_callback_tag = None
333
 
        self.checker_command = config[u"checker"]
334
 
        self.current_checker_command = None
335
 
        self.last_connect = None
336
 
        self._approved = None
337
 
        self.approved_by_default = config.get(u"approved_by_default",
338
 
                                              True)
339
 
        self.approvals_pending = 0
340
 
        self.approval_delay = string_to_delta(
341
 
            config[u"approval_delay"])
342
 
        self.approval_duration = string_to_delta(
343
 
            config[u"approval_duration"])
344
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
345
 
    
346
 
    def send_changedstate(self):
347
 
        self.changedstate.acquire()
348
 
        self.changedstate.notify_all()
349
 
        self.changedstate.release()
350
 
        
351
 
    def enable(self):
 
256
        self.check_command = config["checker"]
 
257
    def start(self):
352
258
        """Start this client's checker and timeout hooks"""
353
 
        if getattr(self, u"enabled", False):
354
 
            # Already enabled
355
 
            return
356
 
        self.send_changedstate()
357
 
        self.last_enabled = datetime.datetime.utcnow()
358
259
        # Schedule a new checker to be started an 'interval' from now,
359
260
        # and every interval from then on.
360
 
        self.checker_initiator_tag = (gobject.timeout_add
361
 
                                      (self.interval_milliseconds(),
362
 
                                       self.start_checker))
363
 
        # Schedule a disable() when 'timeout' has passed
364
 
        self.disable_initiator_tag = (gobject.timeout_add
365
 
                                   (self.timeout_milliseconds(),
366
 
                                    self.disable))
367
 
        self.enabled = True
 
261
        self.checker_initiator_tag = gobject.timeout_add\
 
262
                                     (self._interval_milliseconds,
 
263
                                      self.start_checker)
368
264
        # Also start a new checker *right now*.
369
265
        self.start_checker()
370
 
    
371
 
    def disable(self, quiet=True):
372
 
        """Disable this client."""
373
 
        if not getattr(self, "enabled", False):
 
266
        # Schedule a stop() when 'timeout' has passed
 
267
        self.stop_initiator_tag = gobject.timeout_add\
 
268
                                  (self._timeout_milliseconds,
 
269
                                   self.stop)
 
270
    def stop(self):
 
271
        """Stop this client.
 
272
        The possibility that a client might be restarted is left open,
 
273
        but not currently used."""
 
274
        # If this client doesn't have a secret, it is already stopped.
 
275
        if hasattr(self, "secret") and self.secret:
 
276
            logger.info(u"Stopping client %s", self.name)
 
277
            self.secret = None
 
278
        else:
374
279
            return False
375
 
        if not quiet:
376
 
            self.send_changedstate()
377
 
        if not quiet:
378
 
            logger.info(u"Disabling client %s", self.name)
379
 
        if getattr(self, u"disable_initiator_tag", False):
380
 
            gobject.source_remove(self.disable_initiator_tag)
381
 
            self.disable_initiator_tag = None
382
 
        if getattr(self, u"checker_initiator_tag", False):
 
280
        if getattr(self, "stop_initiator_tag", False):
 
281
            gobject.source_remove(self.stop_initiator_tag)
 
282
            self.stop_initiator_tag = None
 
283
        if getattr(self, "checker_initiator_tag", False):
383
284
            gobject.source_remove(self.checker_initiator_tag)
384
285
            self.checker_initiator_tag = None
385
286
        self.stop_checker()
386
 
        if self.disable_hook:
387
 
            self.disable_hook(self)
388
 
        self.enabled = False
 
287
        if self.stop_hook:
 
288
            self.stop_hook(self)
389
289
        # Do not run this again if called by a gobject.timeout_add
390
290
        return False
391
 
    
392
291
    def __del__(self):
393
 
        self.disable_hook = None
394
 
        self.disable()
395
 
    
396
 
    def checker_callback(self, pid, condition, command):
 
292
        self.stop_hook = None
 
293
        self.stop()
 
294
    def checker_callback(self, pid, condition):
397
295
        """The checker has completed, so take appropriate actions."""
 
296
        now = datetime.datetime.now()
398
297
        self.checker_callback_tag = None
399
298
        self.checker = None
400
 
        if os.WIFEXITED(condition):
401
 
            exitstatus = os.WEXITSTATUS(condition)
402
 
            if exitstatus == 0:
403
 
                logger.info(u"Checker for %(name)s succeeded",
404
 
                            vars(self))
405
 
                self.checked_ok()
406
 
            else:
407
 
                logger.info(u"Checker for %(name)s failed",
408
 
                            vars(self))
409
 
        else:
 
299
        if os.WIFEXITED(condition) \
 
300
               and (os.WEXITSTATUS(condition) == 0):
 
301
            logger.info(u"Checker for %(name)s succeeded",
 
302
                        vars(self))
 
303
            self.last_checked_ok = now
 
304
            gobject.source_remove(self.stop_initiator_tag)
 
305
            self.stop_initiator_tag = gobject.timeout_add\
 
306
                                      (self._timeout_milliseconds,
 
307
                                       self.stop)
 
308
        elif not os.WIFEXITED(condition):
410
309
            logger.warning(u"Checker for %(name)s crashed?",
411
310
                           vars(self))
412
 
    
413
 
    def checked_ok(self):
414
 
        """Bump up the timeout for this client.
415
 
        
416
 
        This should only be called when the client has been seen,
417
 
        alive and well.
418
 
        """
419
 
        self.last_checked_ok = datetime.datetime.utcnow()
420
 
        gobject.source_remove(self.disable_initiator_tag)
421
 
        self.disable_initiator_tag = (gobject.timeout_add
422
 
                                      (self.timeout_milliseconds(),
423
 
                                       self.disable))
424
 
    
 
311
        else:
 
312
            logger.info(u"Checker for %(name)s failed",
 
313
                        vars(self))
425
314
    def start_checker(self):
426
315
        """Start a new checker subprocess if one is not running.
427
 
        
428
316
        If a checker already exists, leave it running and do
429
317
        nothing."""
430
318
        # The reason for not killing a running checker is that if we
433
321
        # client would inevitably timeout, since no checker would get
434
322
        # a chance to run to completion.  If we instead leave running
435
323
        # checkers alone, the checker would have to take more time
436
 
        # than 'timeout' for the client to be disabled, which is as it
437
 
        # should be.
438
 
        
439
 
        # If a checker exists, make sure it is not a zombie
440
 
        try:
441
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
442
 
        except (AttributeError, OSError), error:
443
 
            if (isinstance(error, OSError)
444
 
                and error.errno != errno.ECHILD):
445
 
                raise error
446
 
        else:
447
 
            if pid:
448
 
                logger.warning(u"Checker was a zombie")
449
 
                gobject.source_remove(self.checker_callback_tag)
450
 
                self.checker_callback(pid, status,
451
 
                                      self.current_checker_command)
452
 
        # Start a new checker if needed
 
324
        # than 'timeout' for the client to be declared invalid, which
 
325
        # is as it should be.
453
326
        if self.checker is None:
454
327
            try:
455
 
                # In case checker_command has exactly one % operator
456
 
                command = self.checker_command % self.host
 
328
                # In case check_command has exactly one % operator
 
329
                command = self.check_command % self.host
457
330
            except TypeError:
458
331
                # Escape attributes for the shell
459
 
                escaped_attrs = dict(
460
 
                    (attr,
461
 
                     re.escape(unicode(str(getattr(self, attr, u"")),
462
 
                                       errors=
463
 
                                       u'replace')))
464
 
                    for attr in
465
 
                    self.runtime_expansions)
466
 
 
 
332
                escaped_attrs = dict((key, re.escape(str(val)))
 
333
                                     for key, val in
 
334
                                     vars(self).iteritems())
467
335
                try:
468
 
                    command = self.checker_command % escaped_attrs
 
336
                    command = self.check_command % escaped_attrs
469
337
                except TypeError, error:
470
338
                    logger.error(u'Could not format string "%s":'
471
 
                                 u' %s', self.checker_command, error)
 
339
                                 u' %s', self.check_command, error)
472
340
                    return True # Try again later
473
 
            self.current_checker_command = command
474
341
            try:
475
342
                logger.info(u"Starting checker %r for %s",
476
343
                            command, self.name)
480
347
                # always replaced by /dev/null.)
481
348
                self.checker = subprocess.Popen(command,
482
349
                                                close_fds=True,
483
 
                                                shell=True, cwd=u"/")
484
 
                self.checker_callback_tag = (gobject.child_watch_add
485
 
                                             (self.checker.pid,
486
 
                                              self.checker_callback,
487
 
                                              data=command))
488
 
                # The checker may have completed before the gobject
489
 
                # watch was added.  Check for this.
490
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
491
 
                if pid:
492
 
                    gobject.source_remove(self.checker_callback_tag)
493
 
                    self.checker_callback(pid, status, command)
 
350
                                                shell=True, cwd="/")
 
351
                self.checker_callback_tag = gobject.child_watch_add\
 
352
                                            (self.checker.pid,
 
353
                                             self.checker_callback)
494
354
            except OSError, error:
495
355
                logger.error(u"Failed to start subprocess: %s",
496
356
                             error)
497
357
        # Re-run this periodically if run by gobject.timeout_add
498
358
        return True
499
 
    
500
359
    def stop_checker(self):
501
360
        """Force the checker process, if any, to stop."""
502
361
        if self.checker_callback_tag:
503
362
            gobject.source_remove(self.checker_callback_tag)
504
363
            self.checker_callback_tag = None
505
 
        if getattr(self, u"checker", None) is None:
 
364
        if getattr(self, "checker", None) is None:
506
365
            return
507
366
        logger.debug(u"Stopping checker for %(name)s", vars(self))
508
367
        try:
509
368
            os.kill(self.checker.pid, signal.SIGTERM)
510
 
            #time.sleep(0.5)
 
369
            #os.sleep(0.5)
511
370
            #if self.checker.poll() is None:
512
371
            #    os.kill(self.checker.pid, signal.SIGKILL)
513
372
        except OSError, error:
514
373
            if error.errno != errno.ESRCH: # No such process
515
374
                raise
516
375
        self.checker = None
517
 
 
518
 
def dbus_service_property(dbus_interface, signature=u"v",
519
 
                          access=u"readwrite", byte_arrays=False):
520
 
    """Decorators for marking methods of a DBusObjectWithProperties to
521
 
    become properties on the D-Bus.
522
 
    
523
 
    The decorated method will be called with no arguments by "Get"
524
 
    and with one argument by "Set".
525
 
    
526
 
    The parameters, where they are supported, are the same as
527
 
    dbus.service.method, except there is only "signature", since the
528
 
    type from Get() and the type sent to Set() is the same.
529
 
    """
530
 
    # Encoding deeply encoded byte arrays is not supported yet by the
531
 
    # "Set" method, so we fail early here:
532
 
    if byte_arrays and signature != u"ay":
533
 
        raise ValueError(u"Byte arrays not supported for non-'ay'"
534
 
                         u" signature %r" % signature)
535
 
    def decorator(func):
536
 
        func._dbus_is_property = True
537
 
        func._dbus_interface = dbus_interface
538
 
        func._dbus_signature = signature
539
 
        func._dbus_access = access
540
 
        func._dbus_name = func.__name__
541
 
        if func._dbus_name.endswith(u"_dbus_property"):
542
 
            func._dbus_name = func._dbus_name[:-14]
543
 
        func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
544
 
        return func
545
 
    return decorator
546
 
 
547
 
 
548
 
class DBusPropertyException(dbus.exceptions.DBusException):
549
 
    """A base class for D-Bus property-related exceptions
550
 
    """
551
 
    def __unicode__(self):
552
 
        return unicode(str(self))
553
 
 
554
 
 
555
 
class DBusPropertyAccessException(DBusPropertyException):
556
 
    """A property's access permissions disallows an operation.
557
 
    """
558
 
    pass
559
 
 
560
 
 
561
 
class DBusPropertyNotFound(DBusPropertyException):
562
 
    """An attempt was made to access a non-existing property.
563
 
    """
564
 
    pass
565
 
 
566
 
 
567
 
class DBusObjectWithProperties(dbus.service.Object):
568
 
    """A D-Bus object with properties.
569
 
 
570
 
    Classes inheriting from this can use the dbus_service_property
571
 
    decorator to expose methods as D-Bus properties.  It exposes the
572
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
573
 
    """
574
 
    
575
 
    @staticmethod
576
 
    def _is_dbus_property(obj):
577
 
        return getattr(obj, u"_dbus_is_property", False)
578
 
    
579
 
    def _get_all_dbus_properties(self):
580
 
        """Returns a generator of (name, attribute) pairs
581
 
        """
582
 
        return ((prop._dbus_name, prop)
583
 
                for name, prop in
584
 
                inspect.getmembers(self, self._is_dbus_property))
585
 
    
586
 
    def _get_dbus_property(self, interface_name, property_name):
587
 
        """Returns a bound method if one exists which is a D-Bus
588
 
        property with the specified name and interface.
589
 
        """
590
 
        for name in (property_name,
591
 
                     property_name + u"_dbus_property"):
592
 
            prop = getattr(self, name, None)
593
 
            if (prop is None
594
 
                or not self._is_dbus_property(prop)
595
 
                or prop._dbus_name != property_name
596
 
                or (interface_name and prop._dbus_interface
597
 
                    and interface_name != prop._dbus_interface)):
598
 
                continue
599
 
            return prop
600
 
        # No such property
601
 
        raise DBusPropertyNotFound(self.dbus_object_path + u":"
602
 
                                   + interface_name + u"."
603
 
                                   + property_name)
604
 
    
605
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
606
 
                         out_signature=u"v")
607
 
    def Get(self, interface_name, property_name):
608
 
        """Standard D-Bus property Get() method, see D-Bus standard.
609
 
        """
610
 
        prop = self._get_dbus_property(interface_name, property_name)
611
 
        if prop._dbus_access == u"write":
612
 
            raise DBusPropertyAccessException(property_name)
613
 
        value = prop()
614
 
        if not hasattr(value, u"variant_level"):
615
 
            return value
616
 
        return type(value)(value, variant_level=value.variant_level+1)
617
 
    
618
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
619
 
    def Set(self, interface_name, property_name, value):
620
 
        """Standard D-Bus property Set() method, see D-Bus standard.
621
 
        """
622
 
        prop = self._get_dbus_property(interface_name, property_name)
623
 
        if prop._dbus_access == u"read":
624
 
            raise DBusPropertyAccessException(property_name)
625
 
        if prop._dbus_get_args_options[u"byte_arrays"]:
626
 
            # The byte_arrays option is not supported yet on
627
 
            # signatures other than "ay".
628
 
            if prop._dbus_signature != u"ay":
629
 
                raise ValueError
630
 
            value = dbus.ByteArray(''.join(unichr(byte)
631
 
                                           for byte in value))
632
 
        prop(value)
633
 
    
634
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
635
 
                         out_signature=u"a{sv}")
636
 
    def GetAll(self, interface_name):
637
 
        """Standard D-Bus property GetAll() method, see D-Bus
638
 
        standard.
639
 
 
640
 
        Note: Will not include properties with access="write".
641
 
        """
642
 
        all = {}
643
 
        for name, prop in self._get_all_dbus_properties():
644
 
            if (interface_name
645
 
                and interface_name != prop._dbus_interface):
646
 
                # Interface non-empty but did not match
647
 
                continue
648
 
            # Ignore write-only properties
649
 
            if prop._dbus_access == u"write":
650
 
                continue
651
 
            value = prop()
652
 
            if not hasattr(value, u"variant_level"):
653
 
                all[name] = value
654
 
                continue
655
 
            all[name] = type(value)(value, variant_level=
656
 
                                    value.variant_level+1)
657
 
        return dbus.Dictionary(all, signature=u"sv")
658
 
    
659
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
660
 
                         out_signature=u"s",
661
 
                         path_keyword='object_path',
662
 
                         connection_keyword='connection')
663
 
    def Introspect(self, object_path, connection):
664
 
        """Standard D-Bus method, overloaded to insert property tags.
665
 
        """
666
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
667
 
                                                   connection)
668
 
        try:
669
 
            document = xml.dom.minidom.parseString(xmlstring)
670
 
            def make_tag(document, name, prop):
671
 
                e = document.createElement(u"property")
672
 
                e.setAttribute(u"name", name)
673
 
                e.setAttribute(u"type", prop._dbus_signature)
674
 
                e.setAttribute(u"access", prop._dbus_access)
675
 
                return e
676
 
            for if_tag in document.getElementsByTagName(u"interface"):
677
 
                for tag in (make_tag(document, name, prop)
678
 
                            for name, prop
679
 
                            in self._get_all_dbus_properties()
680
 
                            if prop._dbus_interface
681
 
                            == if_tag.getAttribute(u"name")):
682
 
                    if_tag.appendChild(tag)
683
 
                # Add the names to the return values for the
684
 
                # "org.freedesktop.DBus.Properties" methods
685
 
                if (if_tag.getAttribute(u"name")
686
 
                    == u"org.freedesktop.DBus.Properties"):
687
 
                    for cn in if_tag.getElementsByTagName(u"method"):
688
 
                        if cn.getAttribute(u"name") == u"Get":
689
 
                            for arg in cn.getElementsByTagName(u"arg"):
690
 
                                if (arg.getAttribute(u"direction")
691
 
                                    == u"out"):
692
 
                                    arg.setAttribute(u"name", u"value")
693
 
                        elif cn.getAttribute(u"name") == u"GetAll":
694
 
                            for arg in cn.getElementsByTagName(u"arg"):
695
 
                                if (arg.getAttribute(u"direction")
696
 
                                    == u"out"):
697
 
                                    arg.setAttribute(u"name", u"props")
698
 
            xmlstring = document.toxml(u"utf-8")
699
 
            document.unlink()
700
 
        except (AttributeError, xml.dom.DOMException,
701
 
                xml.parsers.expat.ExpatError), error:
702
 
            logger.error(u"Failed to override Introspection method",
703
 
                         error)
704
 
        return xmlstring
705
 
 
706
 
 
707
 
class ClientDBus(Client, DBusObjectWithProperties):
708
 
    """A Client class using D-Bus
709
 
    
710
 
    Attributes:
711
 
    dbus_object_path: dbus.ObjectPath
712
 
    bus: dbus.SystemBus()
713
 
    """
714
 
    
715
 
    runtime_expansions = (Client.runtime_expansions
716
 
                          + (u"dbus_object_path",))
717
 
    
718
 
    # dbus.service.Object doesn't use super(), so we can't either.
719
 
    
720
 
    def __init__(self, bus = None, *args, **kwargs):
721
 
        self._approvals_pending = 0
722
 
        self.bus = bus
723
 
        Client.__init__(self, *args, **kwargs)
724
 
        # Only now, when this client is initialized, can it show up on
725
 
        # the D-Bus
726
 
        client_object_name = unicode(self.name).translate(
727
 
            {ord(u"."): ord(u"_"),
728
 
             ord(u"-"): ord(u"_")})
729
 
        self.dbus_object_path = (dbus.ObjectPath
730
 
                                 (u"/clients/" + client_object_name))
731
 
        DBusObjectWithProperties.__init__(self, self.bus,
732
 
                                          self.dbus_object_path)
733
 
        
734
 
    def _get_approvals_pending(self):
735
 
        return self._approvals_pending
736
 
    def _set_approvals_pending(self, value):
737
 
        old_value = self._approvals_pending
738
 
        self._approvals_pending = value
739
 
        bval = bool(value)
740
 
        if (hasattr(self, "dbus_object_path")
741
 
            and bval is not bool(old_value)):
742
 
            dbus_bool = dbus.Boolean(bval, variant_level=1)
743
 
            self.PropertyChanged(dbus.String(u"ApprovalPending"),
744
 
                                 dbus_bool)
745
 
 
746
 
    approvals_pending = property(_get_approvals_pending,
747
 
                                 _set_approvals_pending)
748
 
    del _get_approvals_pending, _set_approvals_pending
749
 
    
750
 
    @staticmethod
751
 
    def _datetime_to_dbus(dt, variant_level=0):
752
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
753
 
        return dbus.String(dt.isoformat(),
754
 
                           variant_level=variant_level)
755
 
    
756
 
    def enable(self):
757
 
        oldstate = getattr(self, u"enabled", False)
758
 
        r = Client.enable(self)
759
 
        if oldstate != self.enabled:
760
 
            # Emit D-Bus signals
761
 
            self.PropertyChanged(dbus.String(u"Enabled"),
762
 
                                 dbus.Boolean(True, variant_level=1))
763
 
            self.PropertyChanged(
764
 
                dbus.String(u"LastEnabled"),
765
 
                self._datetime_to_dbus(self.last_enabled,
766
 
                                       variant_level=1))
767
 
        return r
768
 
    
769
 
    def disable(self, quiet = False):
770
 
        oldstate = getattr(self, u"enabled", False)
771
 
        r = Client.disable(self, quiet=quiet)
772
 
        if not quiet and oldstate != self.enabled:
773
 
            # Emit D-Bus signal
774
 
            self.PropertyChanged(dbus.String(u"Enabled"),
775
 
                                 dbus.Boolean(False, variant_level=1))
776
 
        return r
777
 
    
778
 
    def __del__(self, *args, **kwargs):
779
 
        try:
780
 
            self.remove_from_connection()
781
 
        except LookupError:
782
 
            pass
783
 
        if hasattr(DBusObjectWithProperties, u"__del__"):
784
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
785
 
        Client.__del__(self, *args, **kwargs)
786
 
    
787
 
    def checker_callback(self, pid, condition, command,
788
 
                         *args, **kwargs):
789
 
        self.checker_callback_tag = None
790
 
        self.checker = None
791
 
        # Emit D-Bus signal
792
 
        self.PropertyChanged(dbus.String(u"CheckerRunning"),
793
 
                             dbus.Boolean(False, variant_level=1))
794
 
        if os.WIFEXITED(condition):
795
 
            exitstatus = os.WEXITSTATUS(condition)
796
 
            # Emit D-Bus signal
797
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
798
 
                                  dbus.Int64(condition),
799
 
                                  dbus.String(command))
800
 
        else:
801
 
            # Emit D-Bus signal
802
 
            self.CheckerCompleted(dbus.Int16(-1),
803
 
                                  dbus.Int64(condition),
804
 
                                  dbus.String(command))
805
 
        
806
 
        return Client.checker_callback(self, pid, condition, command,
807
 
                                       *args, **kwargs)
808
 
    
809
 
    def checked_ok(self, *args, **kwargs):
810
 
        r = Client.checked_ok(self, *args, **kwargs)
811
 
        # Emit D-Bus signal
812
 
        self.PropertyChanged(
813
 
            dbus.String(u"LastCheckedOK"),
814
 
            (self._datetime_to_dbus(self.last_checked_ok,
815
 
                                    variant_level=1)))
816
 
        return r
817
 
    
818
 
    def start_checker(self, *args, **kwargs):
819
 
        old_checker = self.checker
820
 
        if self.checker is not None:
821
 
            old_checker_pid = self.checker.pid
822
 
        else:
823
 
            old_checker_pid = None
824
 
        r = Client.start_checker(self, *args, **kwargs)
825
 
        # Only if new checker process was started
826
 
        if (self.checker is not None
827
 
            and old_checker_pid != self.checker.pid):
828
 
            # Emit D-Bus signal
829
 
            self.CheckerStarted(self.current_checker_command)
830
 
            self.PropertyChanged(
831
 
                dbus.String(u"CheckerRunning"),
832
 
                dbus.Boolean(True, variant_level=1))
833
 
        return r
834
 
    
835
 
    def stop_checker(self, *args, **kwargs):
836
 
        old_checker = getattr(self, u"checker", None)
837
 
        r = Client.stop_checker(self, *args, **kwargs)
838
 
        if (old_checker is not None
839
 
            and getattr(self, u"checker", None) is None):
840
 
            self.PropertyChanged(dbus.String(u"CheckerRunning"),
841
 
                                 dbus.Boolean(False, variant_level=1))
842
 
        return r
843
 
 
844
 
    def _reset_approved(self):
845
 
        self._approved = None
846
 
        return False
847
 
    
848
 
    def approve(self, value=True):
849
 
        self.send_changedstate()
850
 
        self._approved = value
851
 
        gobject.timeout_add(self._timedelta_to_milliseconds
852
 
                            (self.approval_duration),
853
 
                            self._reset_approved)
854
 
    
855
 
    
856
 
    ## D-Bus methods, signals & properties
857
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
858
 
    
859
 
    ## Signals
860
 
    
861
 
    # CheckerCompleted - signal
862
 
    @dbus.service.signal(_interface, signature=u"nxs")
863
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
864
 
        "D-Bus signal"
865
 
        pass
866
 
    
867
 
    # CheckerStarted - signal
868
 
    @dbus.service.signal(_interface, signature=u"s")
869
 
    def CheckerStarted(self, command):
870
 
        "D-Bus signal"
871
 
        pass
872
 
    
873
 
    # PropertyChanged - signal
874
 
    @dbus.service.signal(_interface, signature=u"sv")
875
 
    def PropertyChanged(self, property, value):
876
 
        "D-Bus signal"
877
 
        pass
878
 
    
879
 
    # GotSecret - signal
880
 
    @dbus.service.signal(_interface)
881
 
    def GotSecret(self):
882
 
        """D-Bus signal
883
 
        Is sent after a successful transfer of secret from the Mandos
884
 
        server to mandos-client
885
 
        """
886
 
        pass
887
 
    
888
 
    # Rejected - signal
889
 
    @dbus.service.signal(_interface, signature=u"s")
890
 
    def Rejected(self, reason):
891
 
        "D-Bus signal"
892
 
        pass
893
 
    
894
 
    # NeedApproval - signal
895
 
    @dbus.service.signal(_interface, signature=u"tb")
896
 
    def NeedApproval(self, timeout, default):
897
 
        "D-Bus signal"
898
 
        pass
899
 
    
900
 
    ## Methods
901
 
 
902
 
    # Approve - method
903
 
    @dbus.service.method(_interface, in_signature=u"b")
904
 
    def Approve(self, value):
905
 
        self.approve(value)
906
 
 
907
 
    # CheckedOK - method
908
 
    @dbus.service.method(_interface)
909
 
    def CheckedOK(self):
910
 
        return self.checked_ok()
911
 
    
912
 
    # Enable - method
913
 
    @dbus.service.method(_interface)
914
 
    def Enable(self):
915
 
        "D-Bus method"
916
 
        self.enable()
917
 
    
918
 
    # StartChecker - method
919
 
    @dbus.service.method(_interface)
920
 
    def StartChecker(self):
921
 
        "D-Bus method"
922
 
        self.start_checker()
923
 
    
924
 
    # Disable - method
925
 
    @dbus.service.method(_interface)
926
 
    def Disable(self):
927
 
        "D-Bus method"
928
 
        self.disable()
929
 
    
930
 
    # StopChecker - method
931
 
    @dbus.service.method(_interface)
932
 
    def StopChecker(self):
933
 
        self.stop_checker()
934
 
    
935
 
    ## Properties
936
 
    
937
 
    # ApprovalPending - property
938
 
    @dbus_service_property(_interface, signature=u"b", access=u"read")
939
 
    def ApprovalPending_dbus_property(self):
940
 
        return dbus.Boolean(bool(self.approvals_pending))
941
 
    
942
 
    # ApprovedByDefault - property
943
 
    @dbus_service_property(_interface, signature=u"b",
944
 
                           access=u"readwrite")
945
 
    def ApprovedByDefault_dbus_property(self, value=None):
946
 
        if value is None:       # get
947
 
            return dbus.Boolean(self.approved_by_default)
948
 
        self.approved_by_default = bool(value)
949
 
        # Emit D-Bus signal
950
 
        self.PropertyChanged(dbus.String(u"ApprovedByDefault"),
951
 
                             dbus.Boolean(value, variant_level=1))
952
 
    
953
 
    # ApprovalDelay - property
954
 
    @dbus_service_property(_interface, signature=u"t",
955
 
                           access=u"readwrite")
956
 
    def ApprovalDelay_dbus_property(self, value=None):
957
 
        if value is None:       # get
958
 
            return dbus.UInt64(self.approval_delay_milliseconds())
959
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
960
 
        # Emit D-Bus signal
961
 
        self.PropertyChanged(dbus.String(u"ApprovalDelay"),
962
 
                             dbus.UInt64(value, variant_level=1))
963
 
    
964
 
    # ApprovalDuration - property
965
 
    @dbus_service_property(_interface, signature=u"t",
966
 
                           access=u"readwrite")
967
 
    def ApprovalDuration_dbus_property(self, value=None):
968
 
        if value is None:       # get
969
 
            return dbus.UInt64(self._timedelta_to_milliseconds(
970
 
                    self.approval_duration))
971
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
972
 
        # Emit D-Bus signal
973
 
        self.PropertyChanged(dbus.String(u"ApprovalDuration"),
974
 
                             dbus.UInt64(value, variant_level=1))
975
 
    
976
 
    # Name - property
977
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
978
 
    def Name_dbus_property(self):
979
 
        return dbus.String(self.name)
980
 
    
981
 
    # Fingerprint - property
982
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
983
 
    def Fingerprint_dbus_property(self):
984
 
        return dbus.String(self.fingerprint)
985
 
    
986
 
    # Host - property
987
 
    @dbus_service_property(_interface, signature=u"s",
988
 
                           access=u"readwrite")
989
 
    def Host_dbus_property(self, value=None):
990
 
        if value is None:       # get
991
 
            return dbus.String(self.host)
992
 
        self.host = value
993
 
        # Emit D-Bus signal
994
 
        self.PropertyChanged(dbus.String(u"Host"),
995
 
                             dbus.String(value, variant_level=1))
996
 
    
997
 
    # Created - property
998
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
999
 
    def Created_dbus_property(self):
1000
 
        return dbus.String(self._datetime_to_dbus(self.created))
1001
 
    
1002
 
    # LastEnabled - property
1003
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
1004
 
    def LastEnabled_dbus_property(self):
1005
 
        if self.last_enabled is None:
1006
 
            return dbus.String(u"")
1007
 
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
1008
 
    
1009
 
    # Enabled - property
1010
 
    @dbus_service_property(_interface, signature=u"b",
1011
 
                           access=u"readwrite")
1012
 
    def Enabled_dbus_property(self, value=None):
1013
 
        if value is None:       # get
1014
 
            return dbus.Boolean(self.enabled)
1015
 
        if value:
1016
 
            self.enable()
1017
 
        else:
1018
 
            self.disable()
1019
 
    
1020
 
    # LastCheckedOK - property
1021
 
    @dbus_service_property(_interface, signature=u"s",
1022
 
                           access=u"readwrite")
1023
 
    def LastCheckedOK_dbus_property(self, value=None):
1024
 
        if value is not None:
1025
 
            self.checked_ok()
1026
 
            return
 
376
    def still_valid(self):
 
377
        """Has the timeout not yet passed for this client?"""
 
378
        now = datetime.datetime.now()
1027
379
        if self.last_checked_ok is None:
1028
 
            return dbus.String(u"")
1029
 
        return dbus.String(self._datetime_to_dbus(self
1030
 
                                                  .last_checked_ok))
1031
 
    
1032
 
    # Timeout - property
1033
 
    @dbus_service_property(_interface, signature=u"t",
1034
 
                           access=u"readwrite")
1035
 
    def Timeout_dbus_property(self, value=None):
1036
 
        if value is None:       # get
1037
 
            return dbus.UInt64(self.timeout_milliseconds())
1038
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1039
 
        # Emit D-Bus signal
1040
 
        self.PropertyChanged(dbus.String(u"Timeout"),
1041
 
                             dbus.UInt64(value, variant_level=1))
1042
 
        if getattr(self, u"disable_initiator_tag", None) is None:
1043
 
            return
1044
 
        # Reschedule timeout
1045
 
        gobject.source_remove(self.disable_initiator_tag)
1046
 
        self.disable_initiator_tag = None
1047
 
        time_to_die = (self.
1048
 
                       _timedelta_to_milliseconds((self
1049
 
                                                   .last_checked_ok
1050
 
                                                   + self.timeout)
1051
 
                                                  - datetime.datetime
1052
 
                                                  .utcnow()))
1053
 
        if time_to_die <= 0:
1054
 
            # The timeout has passed
1055
 
            self.disable()
1056
 
        else:
1057
 
            self.disable_initiator_tag = (gobject.timeout_add
1058
 
                                          (time_to_die, self.disable))
1059
 
    
1060
 
    # Interval - property
1061
 
    @dbus_service_property(_interface, signature=u"t",
1062
 
                           access=u"readwrite")
1063
 
    def Interval_dbus_property(self, value=None):
1064
 
        if value is None:       # get
1065
 
            return dbus.UInt64(self.interval_milliseconds())
1066
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1067
 
        # Emit D-Bus signal
1068
 
        self.PropertyChanged(dbus.String(u"Interval"),
1069
 
                             dbus.UInt64(value, variant_level=1))
1070
 
        if getattr(self, u"checker_initiator_tag", None) is None:
1071
 
            return
1072
 
        # Reschedule checker run
1073
 
        gobject.source_remove(self.checker_initiator_tag)
1074
 
        self.checker_initiator_tag = (gobject.timeout_add
1075
 
                                      (value, self.start_checker))
1076
 
        self.start_checker()    # Start one now, too
1077
 
 
1078
 
    # Checker - property
1079
 
    @dbus_service_property(_interface, signature=u"s",
1080
 
                           access=u"readwrite")
1081
 
    def Checker_dbus_property(self, value=None):
1082
 
        if value is None:       # get
1083
 
            return dbus.String(self.checker_command)
1084
 
        self.checker_command = value
1085
 
        # Emit D-Bus signal
1086
 
        self.PropertyChanged(dbus.String(u"Checker"),
1087
 
                             dbus.String(self.checker_command,
1088
 
                                         variant_level=1))
1089
 
    
1090
 
    # CheckerRunning - property
1091
 
    @dbus_service_property(_interface, signature=u"b",
1092
 
                           access=u"readwrite")
1093
 
    def CheckerRunning_dbus_property(self, value=None):
1094
 
        if value is None:       # get
1095
 
            return dbus.Boolean(self.checker is not None)
1096
 
        if value:
1097
 
            self.start_checker()
1098
 
        else:
1099
 
            self.stop_checker()
1100
 
    
1101
 
    # ObjectPath - property
1102
 
    @dbus_service_property(_interface, signature=u"o", access=u"read")
1103
 
    def ObjectPath_dbus_property(self):
1104
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1105
 
    
1106
 
    # Secret = property
1107
 
    @dbus_service_property(_interface, signature=u"ay",
1108
 
                           access=u"write", byte_arrays=True)
1109
 
    def Secret_dbus_property(self, value):
1110
 
        self.secret = str(value)
1111
 
    
1112
 
    del _interface
1113
 
 
1114
 
 
1115
 
class ProxyClient(object):
1116
 
    def __init__(self, child_pipe, fpr, address):
1117
 
        self._pipe = child_pipe
1118
 
        self._pipe.send(('init', fpr, address))
1119
 
        if not self._pipe.recv():
1120
 
            raise KeyError()
1121
 
 
1122
 
    def __getattribute__(self, name):
1123
 
        if(name == '_pipe'):
1124
 
            return super(ProxyClient, self).__getattribute__(name)
1125
 
        self._pipe.send(('getattr', name))
1126
 
        data = self._pipe.recv()
1127
 
        if data[0] == 'data':
1128
 
            return data[1]
1129
 
        if data[0] == 'function':
1130
 
            def func(*args, **kwargs):
1131
 
                self._pipe.send(('funcall', name, args, kwargs))
1132
 
                return self._pipe.recv()[1]
1133
 
            return func
1134
 
 
1135
 
    def __setattr__(self, name, value):
1136
 
        if(name == '_pipe'):
1137
 
            return super(ProxyClient, self).__setattr__(name, value)
1138
 
        self._pipe.send(('setattr', name, value))
1139
 
 
1140
 
 
1141
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1142
 
    """A class to handle client connections.
1143
 
    
1144
 
    Instantiated once for each connection to handle it.
 
380
            return now < (self.created + self.timeout)
 
381
        else:
 
382
            return now < (self.last_checked_ok + self.timeout)
 
383
 
 
384
 
 
385
def peer_certificate(session):
 
386
    "Return the peer's OpenPGP certificate as a bytestring"
 
387
    # If not an OpenPGP certificate...
 
388
    if gnutls.library.functions.gnutls_certificate_type_get\
 
389
            (session._c_object) \
 
390
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
391
        # ...do the normal thing
 
392
        return session.peer_certificate
 
393
    list_size = ctypes.c_uint()
 
394
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
395
        (session._c_object, ctypes.byref(list_size))
 
396
    if list_size.value == 0:
 
397
        return None
 
398
    cert = cert_list[0]
 
399
    return ctypes.string_at(cert.data, cert.size)
 
400
 
 
401
 
 
402
def fingerprint(openpgp):
 
403
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
404
    # New GnuTLS "datum" with the OpenPGP public key
 
405
    datum = gnutls.library.types.gnutls_datum_t\
 
406
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
407
                     ctypes.POINTER(ctypes.c_ubyte)),
 
408
         ctypes.c_uint(len(openpgp)))
 
409
    # New empty GnuTLS certificate
 
410
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
411
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
412
        (ctypes.byref(crt))
 
413
    # Import the OpenPGP public key into the certificate
 
414
    gnutls.library.functions.gnutls_openpgp_crt_import\
 
415
                    (crt, ctypes.byref(datum),
 
416
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
417
    # Verify the self signature in the key
 
418
    crtverify = ctypes.c_uint();
 
419
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
 
420
        (crt, 0, ctypes.byref(crtverify))
 
421
    if crtverify.value != 0:
 
422
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
423
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
424
    # New buffer for the fingerprint
 
425
    buffer = ctypes.create_string_buffer(20)
 
426
    buffer_length = ctypes.c_size_t()
 
427
    # Get the fingerprint from the certificate into the buffer
 
428
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
429
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
430
    # Deinit the certificate
 
431
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
432
    # Convert the buffer to a Python bytestring
 
433
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
434
    # Convert the bytestring to hexadecimal notation
 
435
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
436
    return hex_fpr
 
437
 
 
438
 
 
439
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
440
    """A TCP request handler class.
 
441
    Instantiated by IPv6_TCPServer for each request to handle it.
1145
442
    Note: This will run in its own forked process."""
1146
443
    
1147
444
    def handle(self):
1148
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1149
 
            logger.info(u"TCP connection from: %s",
1150
 
                        unicode(self.client_address))
1151
 
            logger.debug(u"Pipe FD: %d",
1152
 
                         self.server.child_pipe.fileno())
1153
 
 
1154
 
            session = (gnutls.connection
1155
 
                       .ClientSession(self.request,
1156
 
                                      gnutls.connection
1157
 
                                      .X509Credentials()))
1158
 
 
1159
 
            # Note: gnutls.connection.X509Credentials is really a
1160
 
            # generic GnuTLS certificate credentials object so long as
1161
 
            # no X.509 keys are added to it.  Therefore, we can use it
1162
 
            # here despite using OpenPGP certificates.
1163
 
 
1164
 
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
1165
 
            #                      u"+AES-256-CBC", u"+SHA1",
1166
 
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
1167
 
            #                      u"+DHE-DSS"))
1168
 
            # Use a fallback default, since this MUST be set.
1169
 
            priority = self.server.gnutls_priority
1170
 
            if priority is None:
1171
 
                priority = u"NORMAL"
1172
 
            (gnutls.library.functions
1173
 
             .gnutls_priority_set_direct(session._c_object,
1174
 
                                         priority, None))
1175
 
 
1176
 
            # Start communication using the Mandos protocol
1177
 
            # Get protocol number
1178
 
            line = self.request.makefile().readline()
1179
 
            logger.debug(u"Protocol version: %r", line)
1180
 
            try:
1181
 
                if int(line.strip().split()[0]) > 1:
1182
 
                    raise RuntimeError
1183
 
            except (ValueError, IndexError, RuntimeError), error:
1184
 
                logger.error(u"Unknown protocol version: %s", error)
1185
 
                return
1186
 
 
1187
 
            # Start GnuTLS connection
1188
 
            try:
1189
 
                session.handshake()
1190
 
            except gnutls.errors.GNUTLSError, error:
1191
 
                logger.warning(u"Handshake failed: %s", error)
1192
 
                # Do not run session.bye() here: the session is not
1193
 
                # established.  Just abandon the request.
1194
 
                return
1195
 
            logger.debug(u"Handshake succeeded")
1196
 
 
1197
 
            approval_required = False
1198
 
            try:
1199
 
                try:
1200
 
                    fpr = self.fingerprint(self.peer_certificate
1201
 
                                           (session))
1202
 
                except (TypeError, gnutls.errors.GNUTLSError), error:
1203
 
                    logger.warning(u"Bad certificate: %s", error)
1204
 
                    return
1205
 
                logger.debug(u"Fingerprint: %s", fpr)
1206
 
 
1207
 
                try:
1208
 
                    client = ProxyClient(child_pipe, fpr,
1209
 
                                         self.client_address)
1210
 
                except KeyError:
1211
 
                    return
1212
 
                
1213
 
                if client.approval_delay:
1214
 
                    delay = client.approval_delay
1215
 
                    client.approvals_pending += 1
1216
 
                    approval_required = True
1217
 
                
1218
 
                while True:
1219
 
                    if not client.enabled:
1220
 
                        logger.warning(u"Client %s is disabled",
1221
 
                                       client.name)
1222
 
                        if self.server.use_dbus:
1223
 
                            # Emit D-Bus signal
1224
 
                            client.Rejected("Disabled")                    
1225
 
                        return
1226
 
                    
1227
 
                    if client._approved or not client.approval_delay:
1228
 
                        #We are approved or approval is disabled
1229
 
                        break
1230
 
                    elif client._approved is None:
1231
 
                        logger.info(u"Client %s needs approval",
1232
 
                                    client.name)
1233
 
                        if self.server.use_dbus:
1234
 
                            # Emit D-Bus signal
1235
 
                            client.NeedApproval(
1236
 
                                client.approval_delay_milliseconds(),
1237
 
                                client.approved_by_default)
1238
 
                    else:
1239
 
                        logger.warning(u"Client %s was not approved",
1240
 
                                       client.name)
1241
 
                        if self.server.use_dbus:
1242
 
                            # Emit D-Bus signal
1243
 
                            client.Rejected("Denied")
1244
 
                        return
1245
 
                    
1246
 
                    #wait until timeout or approved
1247
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1248
 
                    time = datetime.datetime.now()
1249
 
                    client.changedstate.acquire()
1250
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1251
 
                    client.changedstate.release()
1252
 
                    time2 = datetime.datetime.now()
1253
 
                    if (time2 - time) >= delay:
1254
 
                        if not client.approved_by_default:
1255
 
                            logger.warning("Client %s timed out while"
1256
 
                                           " waiting for approval",
1257
 
                                           client.name)
1258
 
                            if self.server.use_dbus:
1259
 
                                # Emit D-Bus signal
1260
 
                                client.Rejected("Approval timed out")
1261
 
                            return
1262
 
                        else:
1263
 
                            break
1264
 
                    else:
1265
 
                        delay -= time2 - time
1266
 
                
1267
 
                sent_size = 0
1268
 
                while sent_size < len(client.secret):
1269
 
                    try:
1270
 
                        sent = session.send(client.secret[sent_size:])
1271
 
                    except (gnutls.errors.GNUTLSError), error:
1272
 
                        logger.warning("gnutls send failed")
1273
 
                        return
1274
 
                    logger.debug(u"Sent: %d, remaining: %d",
1275
 
                                 sent, len(client.secret)
1276
 
                                 - (sent_size + sent))
1277
 
                    sent_size += sent
1278
 
 
1279
 
                logger.info(u"Sending secret to %s", client.name)
1280
 
                # bump the timeout as if seen
1281
 
                client.checked_ok()
1282
 
                if self.server.use_dbus:
1283
 
                    # Emit D-Bus signal
1284
 
                    client.GotSecret()
1285
 
            
1286
 
            finally:
1287
 
                if approval_required:
1288
 
                    client.approvals_pending -= 1
1289
 
                try:
1290
 
                    session.bye()
1291
 
                except (gnutls.errors.GNUTLSError), error:
1292
 
                    logger.warning("GnuTLS bye failed")
1293
 
    
1294
 
    @staticmethod
1295
 
    def peer_certificate(session):
1296
 
        "Return the peer's OpenPGP certificate as a bytestring"
1297
 
        # If not an OpenPGP certificate...
1298
 
        if (gnutls.library.functions
1299
 
            .gnutls_certificate_type_get(session._c_object)
1300
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1301
 
            # ...do the normal thing
1302
 
            return session.peer_certificate
1303
 
        list_size = ctypes.c_uint(1)
1304
 
        cert_list = (gnutls.library.functions
1305
 
                     .gnutls_certificate_get_peers
1306
 
                     (session._c_object, ctypes.byref(list_size)))
1307
 
        if not bool(cert_list) and list_size.value != 0:
1308
 
            raise gnutls.errors.GNUTLSError(u"error getting peer"
1309
 
                                            u" certificate")
1310
 
        if list_size.value == 0:
1311
 
            return None
1312
 
        cert = cert_list[0]
1313
 
        return ctypes.string_at(cert.data, cert.size)
1314
 
    
1315
 
    @staticmethod
1316
 
    def fingerprint(openpgp):
1317
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1318
 
        # New GnuTLS "datum" with the OpenPGP public key
1319
 
        datum = (gnutls.library.types
1320
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1321
 
                                             ctypes.POINTER
1322
 
                                             (ctypes.c_ubyte)),
1323
 
                                 ctypes.c_uint(len(openpgp))))
1324
 
        # New empty GnuTLS certificate
1325
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1326
 
        (gnutls.library.functions
1327
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1328
 
        # Import the OpenPGP public key into the certificate
1329
 
        (gnutls.library.functions
1330
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1331
 
                                    gnutls.library.constants
1332
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1333
 
        # Verify the self signature in the key
1334
 
        crtverify = ctypes.c_uint()
1335
 
        (gnutls.library.functions
1336
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1337
 
                                         ctypes.byref(crtverify)))
1338
 
        if crtverify.value != 0:
1339
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1340
 
            raise (gnutls.errors.CertificateSecurityError
1341
 
                   (u"Verify failed"))
1342
 
        # New buffer for the fingerprint
1343
 
        buf = ctypes.create_string_buffer(20)
1344
 
        buf_len = ctypes.c_size_t()
1345
 
        # Get the fingerprint from the certificate into the buffer
1346
 
        (gnutls.library.functions
1347
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1348
 
                                             ctypes.byref(buf_len)))
1349
 
        # Deinit the certificate
1350
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1351
 
        # Convert the buffer to a Python bytestring
1352
 
        fpr = ctypes.string_at(buf, buf_len.value)
1353
 
        # Convert the bytestring to hexadecimal notation
1354
 
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1355
 
        return hex_fpr
1356
 
 
1357
 
 
1358
 
class MultiprocessingMixIn(object):
1359
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1360
 
    def sub_process_main(self, request, address):
1361
 
        try:
1362
 
            self.finish_request(request, address)
1363
 
        except:
1364
 
            self.handle_error(request, address)
1365
 
        self.close_request(request)
1366
 
            
1367
 
    def process_request(self, request, address):
1368
 
        """Start a new process to process the request."""
1369
 
        multiprocessing.Process(target = self.sub_process_main,
1370
 
                                args = (request, address)).start()
1371
 
 
1372
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1373
 
    """ adds a pipe to the MixIn """
1374
 
    def process_request(self, request, client_address):
1375
 
        """Overrides and wraps the original process_request().
1376
 
        
1377
 
        This function creates a new pipe in self.pipe
1378
 
        """
1379
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1380
 
 
1381
 
        super(MultiprocessingMixInWithPipe,
1382
 
              self).process_request(request, client_address)
1383
 
        self.child_pipe.close()
1384
 
        self.add_pipe(parent_pipe)
1385
 
 
1386
 
    def add_pipe(self, parent_pipe):
1387
 
        """Dummy function; override as necessary"""
1388
 
        pass
1389
 
 
1390
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1391
 
                     socketserver.TCPServer, object):
1392
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1393
 
    
 
445
        logger.info(u"TCP connection from: %s",
 
446
                     unicode(self.client_address))
 
447
        session = gnutls.connection.ClientSession\
 
448
                  (self.request, gnutls.connection.X509Credentials())
 
449
        
 
450
        line = self.request.makefile().readline()
 
451
        logger.debug(u"Protocol version: %r", line)
 
452
        try:
 
453
            if int(line.strip().split()[0]) > 1:
 
454
                raise RuntimeError
 
455
        except (ValueError, IndexError, RuntimeError), error:
 
456
            logger.error(u"Unknown protocol version: %s", error)
 
457
            return
 
458
        
 
459
        # Note: gnutls.connection.X509Credentials is really a generic
 
460
        # GnuTLS certificate credentials object so long as no X.509
 
461
        # keys are added to it.  Therefore, we can use it here despite
 
462
        # using OpenPGP certificates.
 
463
        
 
464
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
465
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
466
        #                "+DHE-DSS"))
 
467
        priority = "NORMAL"             # Fallback default, since this
 
468
                                        # MUST be set.
 
469
        if self.server.settings["priority"]:
 
470
            priority = self.server.settings["priority"]
 
471
        gnutls.library.functions.gnutls_priority_set_direct\
 
472
            (session._c_object, priority, None);
 
473
        
 
474
        try:
 
475
            session.handshake()
 
476
        except gnutls.errors.GNUTLSError, error:
 
477
            logger.warning(u"Handshake failed: %s", error)
 
478
            # Do not run session.bye() here: the session is not
 
479
            # established.  Just abandon the request.
 
480
            return
 
481
        try:
 
482
            fpr = fingerprint(peer_certificate(session))
 
483
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
484
            logger.warning(u"Bad certificate: %s", error)
 
485
            session.bye()
 
486
            return
 
487
        logger.debug(u"Fingerprint: %s", fpr)
 
488
        client = None
 
489
        for c in self.server.clients:
 
490
            if c.fingerprint == fpr:
 
491
                client = c
 
492
                break
 
493
        if not client:
 
494
            logger.warning(u"Client not found for fingerprint: %s",
 
495
                           fpr)
 
496
            session.bye()
 
497
            return
 
498
        # Have to check if client.still_valid(), since it is possible
 
499
        # that the client timed out while establishing the GnuTLS
 
500
        # session.
 
501
        if not client.still_valid():
 
502
            logger.warning(u"Client %(name)s is invalid",
 
503
                           vars(client))
 
504
            session.bye()
 
505
            return
 
506
        sent_size = 0
 
507
        while sent_size < len(client.secret):
 
508
            sent = session.send(client.secret[sent_size:])
 
509
            logger.debug(u"Sent: %d, remaining: %d",
 
510
                         sent, len(client.secret)
 
511
                         - (sent_size + sent))
 
512
            sent_size += sent
 
513
        session.bye()
 
514
 
 
515
 
 
516
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
517
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1394
518
    Attributes:
 
519
        settings:       Server settings
 
520
        clients:        Set() of Client objects
1395
521
        enabled:        Boolean; whether this server is activated yet
1396
 
        interface:      None or a network interface name (string)
1397
 
        use_ipv6:       Boolean; to use IPv6 or not
1398
522
    """
1399
 
    def __init__(self, server_address, RequestHandlerClass,
1400
 
                 interface=None, use_ipv6=True):
1401
 
        self.interface = interface
1402
 
        if use_ipv6:
1403
 
            self.address_family = socket.AF_INET6
1404
 
        socketserver.TCPServer.__init__(self, server_address,
1405
 
                                        RequestHandlerClass)
 
523
    address_family = socket.AF_INET6
 
524
    def __init__(self, *args, **kwargs):
 
525
        if "settings" in kwargs:
 
526
            self.settings = kwargs["settings"]
 
527
            del kwargs["settings"]
 
528
        if "clients" in kwargs:
 
529
            self.clients = kwargs["clients"]
 
530
            del kwargs["clients"]
 
531
        self.enabled = False
 
532
        return super(type(self), self).__init__(*args, **kwargs)
1406
533
    def server_bind(self):
1407
534
        """This overrides the normal server_bind() function
1408
535
        to bind to an interface if one was specified, and also NOT to
1409
536
        bind to an address or port if they were not specified."""
1410
 
        if self.interface is not None:
1411
 
            if SO_BINDTODEVICE is None:
1412
 
                logger.error(u"SO_BINDTODEVICE does not exist;"
1413
 
                             u" cannot bind to interface %s",
1414
 
                             self.interface)
1415
 
            else:
1416
 
                try:
1417
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1418
 
                                           SO_BINDTODEVICE,
1419
 
                                           str(self.interface
1420
 
                                               + u'\0'))
1421
 
                except socket.error, error:
1422
 
                    if error[0] == errno.EPERM:
1423
 
                        logger.error(u"No permission to"
1424
 
                                     u" bind to interface %s",
1425
 
                                     self.interface)
1426
 
                    elif error[0] == errno.ENOPROTOOPT:
1427
 
                        logger.error(u"SO_BINDTODEVICE not available;"
1428
 
                                     u" cannot bind to interface %s",
1429
 
                                     self.interface)
1430
 
                    else:
1431
 
                        raise
 
537
        if self.settings["interface"]:
 
538
            # 25 is from /usr/include/asm-i486/socket.h
 
539
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
540
            try:
 
541
                self.socket.setsockopt(socket.SOL_SOCKET,
 
542
                                       SO_BINDTODEVICE,
 
543
                                       self.settings["interface"])
 
544
            except socket.error, error:
 
545
                if error[0] == errno.EPERM:
 
546
                    logger.error(u"No permission to"
 
547
                                 u" bind to interface %s",
 
548
                                 self.settings["interface"])
 
549
                else:
 
550
                    raise error
1432
551
        # Only bind(2) the socket if we really need to.
1433
552
        if self.server_address[0] or self.server_address[1]:
1434
553
            if not self.server_address[0]:
1435
 
                if self.address_family == socket.AF_INET6:
1436
 
                    any_address = u"::" # in6addr_any
1437
 
                else:
1438
 
                    any_address = socket.INADDR_ANY
1439
 
                self.server_address = (any_address,
 
554
                in6addr_any = "::"
 
555
                self.server_address = (in6addr_any,
1440
556
                                       self.server_address[1])
1441
557
            elif not self.server_address[1]:
1442
558
                self.server_address = (self.server_address[0],
1443
559
                                       0)
1444
 
#                 if self.interface:
 
560
#                 if self.settings["interface"]:
1445
561
#                     self.server_address = (self.server_address[0],
1446
562
#                                            0, # port
1447
563
#                                            0, # flowinfo
1448
564
#                                            if_nametoindex
1449
 
#                                            (self.interface))
1450
 
            return socketserver.TCPServer.server_bind(self)
1451
 
 
1452
 
 
1453
 
class MandosServer(IPv6_TCPServer):
1454
 
    """Mandos server.
1455
 
    
1456
 
    Attributes:
1457
 
        clients:        set of Client objects
1458
 
        gnutls_priority GnuTLS priority string
1459
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1460
 
    
1461
 
    Assumes a gobject.MainLoop event loop.
1462
 
    """
1463
 
    def __init__(self, server_address, RequestHandlerClass,
1464
 
                 interface=None, use_ipv6=True, clients=None,
1465
 
                 gnutls_priority=None, use_dbus=True):
1466
 
        self.enabled = False
1467
 
        self.clients = clients
1468
 
        if self.clients is None:
1469
 
            self.clients = set()
1470
 
        self.use_dbus = use_dbus
1471
 
        self.gnutls_priority = gnutls_priority
1472
 
        IPv6_TCPServer.__init__(self, server_address,
1473
 
                                RequestHandlerClass,
1474
 
                                interface = interface,
1475
 
                                use_ipv6 = use_ipv6)
 
565
#                                            (self.settings
 
566
#                                             ["interface"]))
 
567
            return super(type(self), self).server_bind()
1476
568
    def server_activate(self):
1477
569
        if self.enabled:
1478
 
            return socketserver.TCPServer.server_activate(self)
 
570
            return super(type(self), self).server_activate()
1479
571
    def enable(self):
1480
572
        self.enabled = True
1481
 
    def add_pipe(self, parent_pipe):
1482
 
        # Call "handle_ipc" for both data and EOF events
1483
 
        gobject.io_add_watch(parent_pipe.fileno(),
1484
 
                             gobject.IO_IN | gobject.IO_HUP,
1485
 
                             functools.partial(self.handle_ipc,
1486
 
                                               parent_pipe = parent_pipe))
1487
 
        
1488
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1489
 
                   client_object=None):
1490
 
        condition_names = {
1491
 
            gobject.IO_IN: u"IN",   # There is data to read.
1492
 
            gobject.IO_OUT: u"OUT", # Data can be written (without
1493
 
                                    # blocking).
1494
 
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
1495
 
            gobject.IO_ERR: u"ERR", # Error condition.
1496
 
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
1497
 
                                    # broken, usually for pipes and
1498
 
                                    # sockets).
1499
 
            }
1500
 
        conditions_string = ' | '.join(name
1501
 
                                       for cond, name in
1502
 
                                       condition_names.iteritems()
1503
 
                                       if cond & condition)
1504
 
        # error or the other end of multiprocessing.Pipe has closed
1505
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1506
 
            return False
1507
 
        
1508
 
        # Read a request from the child
1509
 
        request = parent_pipe.recv()
1510
 
        command = request[0]
1511
 
        
1512
 
        if command == 'init':
1513
 
            fpr = request[1]
1514
 
            address = request[2]
1515
 
            
1516
 
            for c in self.clients:
1517
 
                if c.fingerprint == fpr:
1518
 
                    client = c
1519
 
                    break
1520
 
            else:
1521
 
                logger.warning(u"Client not found for fingerprint: %s, ad"
1522
 
                               u"dress: %s", fpr, address)
1523
 
                if self.use_dbus:
1524
 
                    # Emit D-Bus signal
1525
 
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
1526
 
                parent_pipe.send(False)
1527
 
                return False
1528
 
            
1529
 
            gobject.io_add_watch(parent_pipe.fileno(),
1530
 
                                 gobject.IO_IN | gobject.IO_HUP,
1531
 
                                 functools.partial(self.handle_ipc,
1532
 
                                                   parent_pipe = parent_pipe,
1533
 
                                                   client_object = client))
1534
 
            parent_pipe.send(True)
1535
 
            # remove the old hook in favor of the new above hook on same fileno
1536
 
            return False
1537
 
        if command == 'funcall':
1538
 
            funcname = request[1]
1539
 
            args = request[2]
1540
 
            kwargs = request[3]
1541
 
            
1542
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1543
 
 
1544
 
        if command == 'getattr':
1545
 
            attrname = request[1]
1546
 
            if callable(client_object.__getattribute__(attrname)):
1547
 
                parent_pipe.send(('function',))
1548
 
            else:
1549
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1550
 
        
1551
 
        if command == 'setattr':
1552
 
            attrname = request[1]
1553
 
            value = request[2]
1554
 
            setattr(client_object, attrname, value)
1555
 
 
1556
 
        return True
1557
573
 
1558
574
 
1559
575
def string_to_delta(interval):
1560
576
    """Parse a string and return a datetime.timedelta
1561
 
    
1562
 
    >>> string_to_delta(u'7d')
 
577
 
 
578
    >>> string_to_delta('7d')
1563
579
    datetime.timedelta(7)
1564
 
    >>> string_to_delta(u'60s')
 
580
    >>> string_to_delta('60s')
1565
581
    datetime.timedelta(0, 60)
1566
 
    >>> string_to_delta(u'60m')
 
582
    >>> string_to_delta('60m')
1567
583
    datetime.timedelta(0, 3600)
1568
 
    >>> string_to_delta(u'24h')
 
584
    >>> string_to_delta('24h')
1569
585
    datetime.timedelta(1)
1570
586
    >>> string_to_delta(u'1w')
1571
587
    datetime.timedelta(7)
1572
 
    >>> string_to_delta(u'5m 30s')
 
588
    >>> string_to_delta('5m 30s')
1573
589
    datetime.timedelta(0, 330)
1574
590
    """
1575
591
    timevalue = datetime.timedelta(0)
1576
592
    for s in interval.split():
1577
593
        try:
1578
 
            suffix = unicode(s[-1])
1579
 
            value = int(s[:-1])
 
594
            suffix=unicode(s[-1])
 
595
            value=int(s[:-1])
1580
596
            if suffix == u"d":
1581
597
                delta = datetime.timedelta(value)
1582
598
            elif suffix == u"s":
1588
604
            elif suffix == u"w":
1589
605
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1590
606
            else:
1591
 
                raise ValueError(u"Unknown suffix %r" % suffix)
1592
 
        except (ValueError, IndexError), e:
1593
 
            raise ValueError(e.message)
 
607
                raise ValueError
 
608
        except (ValueError, IndexError):
 
609
            raise ValueError
1594
610
        timevalue += delta
1595
611
    return timevalue
1596
612
 
1597
613
 
 
614
def server_state_changed(state):
 
615
    """Derived from the Avahi example code"""
 
616
    if state == avahi.SERVER_COLLISION:
 
617
        logger.error(u"Zeroconf server name collision")
 
618
        service.remove()
 
619
    elif state == avahi.SERVER_RUNNING:
 
620
        service.add()
 
621
 
 
622
 
 
623
def entry_group_state_changed(state, error):
 
624
    """Derived from the Avahi example code"""
 
625
    logger.debug(u"Avahi state change: %i", state)
 
626
    
 
627
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
628
        logger.debug(u"Zeroconf service established.")
 
629
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
630
        logger.warning(u"Zeroconf service name collision.")
 
631
        service.rename()
 
632
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
633
        logger.critical(u"Avahi: Error in group state changed %s",
 
634
                        unicode(error))
 
635
        raise AvahiGroupError("State changed: %s", str(error))
 
636
 
1598
637
def if_nametoindex(interface):
1599
 
    """Call the C function if_nametoindex(), or equivalent
1600
 
    
1601
 
    Note: This function cannot accept a unicode string."""
 
638
    """Call the C function if_nametoindex(), or equivalent"""
1602
639
    global if_nametoindex
1603
640
    try:
1604
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1605
 
                          (ctypes.util.find_library(u"c"))
1606
 
                          .if_nametoindex)
 
641
        if "ctypes.util" not in sys.modules:
 
642
            import ctypes.util
 
643
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
644
            (ctypes.util.find_library("c")).if_nametoindex
1607
645
    except (OSError, AttributeError):
1608
 
        logger.warning(u"Doing if_nametoindex the hard way")
 
646
        if "struct" not in sys.modules:
 
647
            import struct
 
648
        if "fcntl" not in sys.modules:
 
649
            import fcntl
1609
650
        def if_nametoindex(interface):
1610
651
            "Get an interface index the hard way, i.e. using fcntl()"
1611
652
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1612
 
            with contextlib.closing(socket.socket()) as s:
1613
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1614
 
                                    struct.pack(str(u"16s16x"),
1615
 
                                                interface))
1616
 
            interface_index = struct.unpack(str(u"I"),
1617
 
                                            ifreq[16:20])[0]
 
653
            s = socket.socket()
 
654
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
655
                                struct.pack("16s16x", interface))
 
656
            s.close()
 
657
            interface_index = struct.unpack("I", ifreq[16:20])[0]
1618
658
            return interface_index
1619
659
    return if_nametoindex(interface)
1620
660
 
1621
661
 
1622
662
def daemon(nochdir = False, noclose = False):
1623
663
    """See daemon(3).  Standard BSD Unix function.
1624
 
    
1625
664
    This should really exist as os.daemon, but it doesn't (yet)."""
1626
665
    if os.fork():
1627
666
        sys.exit()
1628
667
    os.setsid()
1629
668
    if not nochdir:
1630
 
        os.chdir(u"/")
 
669
        os.chdir("/")
1631
670
    if os.fork():
1632
671
        sys.exit()
1633
672
    if not noclose:
1635
674
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1636
675
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1637
676
            raise OSError(errno.ENODEV,
1638
 
                          u"%s not a character device"
1639
 
                          % os.path.devnull)
 
677
                          "/dev/null not a character device")
1640
678
        os.dup2(null, sys.stdin.fileno())
1641
679
        os.dup2(null, sys.stdout.fileno())
1642
680
        os.dup2(null, sys.stderr.fileno())
1645
683
 
1646
684
 
1647
685
def main():
1648
 
    
1649
 
    ##################################################################
1650
 
    # Parsing of options, both command line and config file
1651
 
    
1652
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
1653
 
    parser.add_option("-i", u"--interface", type=u"string",
1654
 
                      metavar="IF", help=u"Bind to interface IF")
1655
 
    parser.add_option("-a", u"--address", type=u"string",
1656
 
                      help=u"Address to listen for requests on")
1657
 
    parser.add_option("-p", u"--port", type=u"int",
1658
 
                      help=u"Port number to receive requests on")
1659
 
    parser.add_option("--check", action=u"store_true",
1660
 
                      help=u"Run self-test")
1661
 
    parser.add_option("--debug", action=u"store_true",
1662
 
                      help=u"Debug mode; run in foreground and log to"
1663
 
                      u" terminal")
1664
 
    parser.add_option("--debuglevel", type=u"string", metavar="Level",
1665
 
                      help=u"Debug level for stdout output")
1666
 
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1667
 
                      u" priority string (see GnuTLS documentation)")
1668
 
    parser.add_option("--servicename", type=u"string",
1669
 
                      metavar=u"NAME", help=u"Zeroconf service name")
1670
 
    parser.add_option("--configdir", type=u"string",
1671
 
                      default=u"/etc/mandos", metavar=u"DIR",
1672
 
                      help=u"Directory to search for configuration"
1673
 
                      u" files")
1674
 
    parser.add_option("--no-dbus", action=u"store_false",
1675
 
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
1676
 
                      u" system bus interface")
1677
 
    parser.add_option("--no-ipv6", action=u"store_false",
1678
 
                      dest=u"use_ipv6", help=u"Do not use IPv6")
1679
 
    options = parser.parse_args()[0]
 
686
    global main_loop_started
 
687
    main_loop_started = False
 
688
    
 
689
    parser = OptionParser(version = "%%prog %s" % version)
 
690
    parser.add_option("-i", "--interface", type="string",
 
691
                      metavar="IF", help="Bind to interface IF")
 
692
    parser.add_option("-a", "--address", type="string",
 
693
                      help="Address to listen for requests on")
 
694
    parser.add_option("-p", "--port", type="int",
 
695
                      help="Port number to receive requests on")
 
696
    parser.add_option("--check", action="store_true", default=False,
 
697
                      help="Run self-test")
 
698
    parser.add_option("--debug", action="store_true",
 
699
                      help="Debug mode; run in foreground and log to"
 
700
                      " terminal")
 
701
    parser.add_option("--priority", type="string", help="GnuTLS"
 
702
                      " priority string (see GnuTLS documentation)")
 
703
    parser.add_option("--servicename", type="string", metavar="NAME",
 
704
                      help="Zeroconf service name")
 
705
    parser.add_option("--configdir", type="string",
 
706
                      default="/etc/mandos", metavar="DIR",
 
707
                      help="Directory to search for configuration"
 
708
                      " files")
 
709
    (options, args) = parser.parse_args()
1680
710
    
1681
711
    if options.check:
1682
712
        import doctest
1684
714
        sys.exit()
1685
715
    
1686
716
    # Default values for config file for server-global settings
1687
 
    server_defaults = { u"interface": u"",
1688
 
                        u"address": u"",
1689
 
                        u"port": u"",
1690
 
                        u"debug": u"False",
1691
 
                        u"priority":
1692
 
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1693
 
                        u"servicename": u"Mandos",
1694
 
                        u"use_dbus": u"True",
1695
 
                        u"use_ipv6": u"True",
1696
 
                        u"debuglevel": u"",
 
717
    server_defaults = { "interface": "",
 
718
                        "address": "",
 
719
                        "port": "",
 
720
                        "debug": "False",
 
721
                        "priority":
 
722
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
723
                        "servicename": "Mandos",
1697
724
                        }
1698
725
    
1699
726
    # Parse config file for server-global settings
1700
 
    server_config = configparser.SafeConfigParser(server_defaults)
 
727
    server_config = ConfigParser.SafeConfigParser(server_defaults)
1701
728
    del server_defaults
1702
 
    server_config.read(os.path.join(options.configdir,
1703
 
                                    u"mandos.conf"))
 
729
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
1704
730
    # Convert the SafeConfigParser object to a dict
1705
731
    server_settings = server_config.defaults()
1706
 
    # Use the appropriate methods on the non-string config options
1707
 
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
1708
 
        server_settings[option] = server_config.getboolean(u"DEFAULT",
1709
 
                                                           option)
1710
 
    if server_settings["port"]:
1711
 
        server_settings["port"] = server_config.getint(u"DEFAULT",
1712
 
                                                       u"port")
 
732
    # Use getboolean on the boolean config option
 
733
    server_settings["debug"] = server_config.getboolean\
 
734
                               ("DEFAULT", "debug")
1713
735
    del server_config
1714
736
    
1715
737
    # Override the settings from the config file with command line
1716
738
    # options, if set.
1717
 
    for option in (u"interface", u"address", u"port", u"debug",
1718
 
                   u"priority", u"servicename", u"configdir",
1719
 
                   u"use_dbus", u"use_ipv6", u"debuglevel"):
 
739
    for option in ("interface", "address", "port", "debug",
 
740
                   "priority", "servicename", "configdir"):
1720
741
        value = getattr(options, option)
1721
742
        if value is not None:
1722
743
            server_settings[option] = value
1723
744
    del options
1724
 
    # Force all strings to be unicode
1725
 
    for option in server_settings.keys():
1726
 
        if type(server_settings[option]) is str:
1727
 
            server_settings[option] = unicode(server_settings[option])
1728
745
    # Now we have our good server settings in "server_settings"
1729
746
    
1730
 
    ##################################################################
1731
 
    
1732
 
    # For convenience
1733
 
    debug = server_settings[u"debug"]
1734
 
    debuglevel = server_settings[u"debuglevel"]
1735
 
    use_dbus = server_settings[u"use_dbus"]
1736
 
    use_ipv6 = server_settings[u"use_ipv6"]
1737
 
 
1738
 
    if server_settings[u"servicename"] != u"Mandos":
1739
 
        syslogger.setFormatter(logging.Formatter
1740
 
                               (u'Mandos (%s) [%%(process)d]:'
1741
 
                                u' %%(levelname)s: %%(message)s'
1742
 
                                % server_settings[u"servicename"]))
 
747
    debug = server_settings["debug"]
 
748
    
 
749
    if not debug:
 
750
        syslogger.setLevel(logging.WARNING)
 
751
        console.setLevel(logging.WARNING)
 
752
    
 
753
    if server_settings["servicename"] != "Mandos":
 
754
        syslogger.setFormatter(logging.Formatter\
 
755
                               ('Mandos (%s): %%(levelname)s:'
 
756
                                ' %%(message)s'
 
757
                                % server_settings["servicename"]))
1743
758
    
1744
759
    # Parse config file with clients
1745
 
    client_defaults = { u"timeout": u"1h",
1746
 
                        u"interval": u"5m",
1747
 
                        u"checker": u"fping -q -- %%(host)s",
1748
 
                        u"host": u"",
1749
 
                        u"approval_delay": u"0s",
1750
 
                        u"approval_duration": u"1s",
 
760
    client_defaults = { "timeout": "1h",
 
761
                        "interval": "5m",
 
762
                        "checker": "fping -q -- %(host)s",
 
763
                        "host": "",
1751
764
                        }
1752
 
    client_config = configparser.SafeConfigParser(client_defaults)
1753
 
    client_config.read(os.path.join(server_settings[u"configdir"],
1754
 
                                    u"clients.conf"))
1755
 
    
1756
 
    global mandos_dbus_service
1757
 
    mandos_dbus_service = None
1758
 
    
1759
 
    tcp_server = MandosServer((server_settings[u"address"],
1760
 
                               server_settings[u"port"]),
1761
 
                              ClientHandler,
1762
 
                              interface=(server_settings[u"interface"]
1763
 
                                         or None),
1764
 
                              use_ipv6=use_ipv6,
1765
 
                              gnutls_priority=
1766
 
                              server_settings[u"priority"],
1767
 
                              use_dbus=use_dbus)
1768
 
    if not debug:
1769
 
        pidfilename = u"/var/run/mandos.pid"
1770
 
        try:
1771
 
            pidfile = open(pidfilename, u"w")
1772
 
        except IOError:
1773
 
            logger.error(u"Could not open file %r", pidfilename)
1774
 
    
1775
 
    try:
1776
 
        uid = pwd.getpwnam(u"_mandos").pw_uid
1777
 
        gid = pwd.getpwnam(u"_mandos").pw_gid
1778
 
    except KeyError:
1779
 
        try:
1780
 
            uid = pwd.getpwnam(u"mandos").pw_uid
1781
 
            gid = pwd.getpwnam(u"mandos").pw_gid
1782
 
        except KeyError:
1783
 
            try:
1784
 
                uid = pwd.getpwnam(u"nobody").pw_uid
1785
 
                gid = pwd.getpwnam(u"nobody").pw_gid
1786
 
            except KeyError:
1787
 
                uid = 65534
1788
 
                gid = 65534
1789
 
    try:
 
765
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
766
    client_config.read(os.path.join(server_settings["configdir"],
 
767
                                    "clients.conf"))
 
768
    
 
769
    clients = Set()
 
770
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
771
                                 server_settings["port"]),
 
772
                                tcp_handler,
 
773
                                settings=server_settings,
 
774
                                clients=clients)
 
775
    pidfilename = "/var/run/mandos.pid"
 
776
    try:
 
777
        pidfile = open(pidfilename, "w")
 
778
    except IOError, error:
 
779
        logger.error("Could not open file %r", pidfilename)
 
780
    
 
781
    uid = 65534
 
782
    gid = 65534
 
783
    try:
 
784
        uid = pwd.getpwnam("mandos").pw_uid
 
785
    except KeyError:
 
786
        try:
 
787
            uid = pwd.getpwnam("nobody").pw_uid
 
788
        except KeyError:
 
789
            pass
 
790
    try:
 
791
        gid = pwd.getpwnam("mandos").pw_gid
 
792
    except KeyError:
 
793
        try:
 
794
            gid = pwd.getpwnam("nogroup").pw_gid
 
795
        except KeyError:
 
796
            pass
 
797
    try:
 
798
        os.setuid(uid)
1790
799
        os.setgid(gid)
1791
 
        os.setuid(uid)
1792
800
    except OSError, error:
1793
801
        if error[0] != errno.EPERM:
1794
802
            raise error
1795
803
    
1796
 
    if not debug and not debuglevel:
1797
 
        syslogger.setLevel(logging.WARNING)
1798
 
        console.setLevel(logging.WARNING)
1799
 
    if debuglevel:
1800
 
        level = getattr(logging, debuglevel.upper())
1801
 
        syslogger.setLevel(level)
1802
 
        console.setLevel(level)
1803
 
 
1804
 
    if debug:
1805
 
        # Enable all possible GnuTLS debugging
1806
 
        
1807
 
        # "Use a log level over 10 to enable all debugging options."
1808
 
        # - GnuTLS manual
1809
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1810
 
        
1811
 
        @gnutls.library.types.gnutls_log_func
1812
 
        def debug_gnutls(level, string):
1813
 
            logger.debug(u"GnuTLS: %s", string[:-1])
1814
 
        
1815
 
        (gnutls.library.functions
1816
 
         .gnutls_global_set_log_function(debug_gnutls))
1817
 
        
1818
 
        # Redirect stdin so all checkers get /dev/null
1819
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1820
 
        os.dup2(null, sys.stdin.fileno())
1821
 
        if null > 2:
1822
 
            os.close(null)
1823
 
    else:
1824
 
        # No console logging
1825
 
        logger.removeHandler(console)
1826
 
    
 
804
    global service
 
805
    service = AvahiService(name = server_settings["servicename"],
 
806
                           type = "_mandos._tcp", );
 
807
    if server_settings["interface"]:
 
808
        service.interface = if_nametoindex\
 
809
                            (server_settings["interface"])
1827
810
    
1828
811
    global main_loop
 
812
    global bus
 
813
    global server
1829
814
    # From the Avahi example code
1830
815
    DBusGMainLoop(set_as_default=True )
1831
816
    main_loop = gobject.MainLoop()
1832
817
    bus = dbus.SystemBus()
 
818
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
819
                                           avahi.DBUS_PATH_SERVER),
 
820
                            avahi.DBUS_INTERFACE_SERVER)
1833
821
    # End of Avahi example code
1834
 
    if use_dbus:
1835
 
        try:
1836
 
            bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
1837
 
                                            bus, do_not_queue=True)
1838
 
        except dbus.exceptions.NameExistsException, e:
1839
 
            logger.error(unicode(e) + u", disabling D-Bus")
1840
 
            use_dbus = False
1841
 
            server_settings[u"use_dbus"] = False
1842
 
            tcp_server.use_dbus = False
1843
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1844
 
    service = AvahiService(name = server_settings[u"servicename"],
1845
 
                           servicetype = u"_mandos._tcp",
1846
 
                           protocol = protocol, bus = bus)
1847
 
    if server_settings["interface"]:
1848
 
        service.interface = (if_nametoindex
1849
 
                             (str(server_settings[u"interface"])))
1850
 
 
1851
 
    if not debug:
 
822
    
 
823
    def remove_from_clients(client):
 
824
        clients.remove(client)
 
825
        if not clients:
 
826
            logger.critical(u"No clients left, exiting")
 
827
            sys.exit()
 
828
    
 
829
    clients.update(Set(Client(name = section,
 
830
                              stop_hook = remove_from_clients,
 
831
                              config
 
832
                              = dict(client_config.items(section)))
 
833
                       for section in client_config.sections()))
 
834
    if not clients:
 
835
        logger.critical(u"No clients defined")
 
836
        sys.exit(1)
 
837
    
 
838
    if debug:
 
839
        # Redirect stdin so all checkers get /dev/null
 
840
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
841
        os.dup2(null, sys.stdin.fileno())
 
842
        if null > 2:
 
843
            os.close(null)
 
844
    else:
 
845
        # No console logging
 
846
        logger.removeHandler(console)
1852
847
        # Close all input and output, do double fork, etc.
1853
848
        daemon()
1854
 
        
1855
 
    global multiprocessing_manager
1856
 
    multiprocessing_manager = multiprocessing.Manager()
1857
 
    
1858
 
    client_class = Client
1859
 
    if use_dbus:
1860
 
        client_class = functools.partial(ClientDBus, bus = bus)
1861
 
    def client_config_items(config, section):
1862
 
        special_settings = {
1863
 
            "approved_by_default":
1864
 
                lambda: config.getboolean(section,
1865
 
                                          "approved_by_default"),
1866
 
            }
1867
 
        for name, value in config.items(section):
1868
 
            try:
1869
 
                yield (name, special_settings[name]())
1870
 
            except KeyError:
1871
 
                yield (name, value)
1872
 
    
1873
 
    tcp_server.clients.update(set(
1874
 
            client_class(name = section,
1875
 
                         config= dict(client_config_items(
1876
 
                        client_config, section)))
1877
 
            for section in client_config.sections()))
1878
 
    if not tcp_server.clients:
1879
 
        logger.warning(u"No clients defined")
1880
 
        
 
849
    
 
850
    try:
 
851
        pid = os.getpid()
 
852
        pidfile.write(str(pid) + "\n")
 
853
        pidfile.close()
 
854
        del pidfile
 
855
    except IOError, err:
 
856
        logger.error(u"Could not write to file %r with PID %d",
 
857
                     pidfilename, pid)
 
858
    except NameError:
 
859
        # "pidfile" was never created
 
860
        pass
 
861
    del pidfilename
 
862
    
 
863
    def cleanup():
 
864
        "Cleanup function; run on exit"
 
865
        global group
 
866
        # From the Avahi example code
 
867
        if not group is None:
 
868
            group.Free()
 
869
            group = None
 
870
        # End of Avahi example code
 
871
        
 
872
        while clients:
 
873
            client = clients.pop()
 
874
            client.stop_hook = None
 
875
            client.stop()
 
876
    
 
877
    atexit.register(cleanup)
 
878
    
1881
879
    if not debug:
1882
 
        try:
1883
 
            with pidfile:
1884
 
                pid = os.getpid()
1885
 
                pidfile.write(str(pid) + "\n")
1886
 
            del pidfile
1887
 
        except IOError:
1888
 
            logger.error(u"Could not write to file %r with PID %d",
1889
 
                         pidfilename, pid)
1890
 
        except NameError:
1891
 
            # "pidfile" was never created
1892
 
            pass
1893
 
        del pidfilename
1894
 
        
1895
880
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1896
 
 
1897
881
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1898
882
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1899
883
    
1900
 
    if use_dbus:
1901
 
        class MandosDBusService(dbus.service.Object):
1902
 
            """A D-Bus proxy object"""
1903
 
            def __init__(self):
1904
 
                dbus.service.Object.__init__(self, bus, u"/")
1905
 
            _interface = u"se.bsnet.fukt.Mandos"
1906
 
            
1907
 
            @dbus.service.signal(_interface, signature=u"o")
1908
 
            def ClientAdded(self, objpath):
1909
 
                "D-Bus signal"
1910
 
                pass
1911
 
            
1912
 
            @dbus.service.signal(_interface, signature=u"ss")
1913
 
            def ClientNotFound(self, fingerprint, address):
1914
 
                "D-Bus signal"
1915
 
                pass
1916
 
            
1917
 
            @dbus.service.signal(_interface, signature=u"os")
1918
 
            def ClientRemoved(self, objpath, name):
1919
 
                "D-Bus signal"
1920
 
                pass
1921
 
            
1922
 
            @dbus.service.method(_interface, out_signature=u"ao")
1923
 
            def GetAllClients(self):
1924
 
                "D-Bus method"
1925
 
                return dbus.Array(c.dbus_object_path
1926
 
                                  for c in tcp_server.clients)
1927
 
            
1928
 
            @dbus.service.method(_interface,
1929
 
                                 out_signature=u"a{oa{sv}}")
1930
 
            def GetAllClientsWithProperties(self):
1931
 
                "D-Bus method"
1932
 
                return dbus.Dictionary(
1933
 
                    ((c.dbus_object_path, c.GetAll(u""))
1934
 
                     for c in tcp_server.clients),
1935
 
                    signature=u"oa{sv}")
1936
 
            
1937
 
            @dbus.service.method(_interface, in_signature=u"o")
1938
 
            def RemoveClient(self, object_path):
1939
 
                "D-Bus method"
1940
 
                for c in tcp_server.clients:
1941
 
                    if c.dbus_object_path == object_path:
1942
 
                        tcp_server.clients.remove(c)
1943
 
                        c.remove_from_connection()
1944
 
                        # Don't signal anything except ClientRemoved
1945
 
                        c.disable(quiet=True)
1946
 
                        # Emit D-Bus signal
1947
 
                        self.ClientRemoved(object_path, c.name)
1948
 
                        return
1949
 
                raise KeyError(object_path)
1950
 
            
1951
 
            del _interface
1952
 
        
1953
 
        mandos_dbus_service = MandosDBusService()
1954
 
    
1955
 
    def cleanup():
1956
 
        "Cleanup function; run on exit"
1957
 
        service.cleanup()
1958
 
        
1959
 
        while tcp_server.clients:
1960
 
            client = tcp_server.clients.pop()
1961
 
            if use_dbus:
1962
 
                client.remove_from_connection()
1963
 
            client.disable_hook = None
1964
 
            # Don't signal anything except ClientRemoved
1965
 
            client.disable(quiet=True)
1966
 
            if use_dbus:
1967
 
                # Emit D-Bus signal
1968
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1969
 
                                                  client.name)
1970
 
    
1971
 
    atexit.register(cleanup)
1972
 
    
1973
 
    for client in tcp_server.clients:
1974
 
        if use_dbus:
1975
 
            # Emit D-Bus signal
1976
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
1977
 
        client.enable()
 
884
    for client in clients:
 
885
        client.start()
1978
886
    
1979
887
    tcp_server.enable()
1980
888
    tcp_server.server_activate()
1981
889
    
1982
890
    # Find out what port we got
1983
891
    service.port = tcp_server.socket.getsockname()[1]
1984
 
    if use_ipv6:
1985
 
        logger.info(u"Now listening on address %r, port %d,"
1986
 
                    " flowinfo %d, scope_id %d"
1987
 
                    % tcp_server.socket.getsockname())
1988
 
    else:                       # IPv4
1989
 
        logger.info(u"Now listening on address %r, port %d"
1990
 
                    % tcp_server.socket.getsockname())
 
892
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
893
                u" scope_id %d" % tcp_server.socket.getsockname())
1991
894
    
1992
895
    #service.interface = tcp_server.socket.getsockname()[3]
1993
896
    
1994
897
    try:
1995
898
        # From the Avahi example code
 
899
        server.connect_to_signal("StateChanged", server_state_changed)
1996
900
        try:
1997
 
            service.activate()
 
901
            server_state_changed(server.GetState())
1998
902
        except dbus.exceptions.DBusException, error:
1999
903
            logger.critical(u"DBusException: %s", error)
2000
 
            cleanup()
2001
904
            sys.exit(1)
2002
905
        # End of Avahi example code
2003
906
        
2004
907
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2005
908
                             lambda *args, **kwargs:
2006
 
                             (tcp_server.handle_request
2007
 
                              (*args[2:], **kwargs) or True))
 
909
                             tcp_server.handle_request\
 
910
                             (*args[2:], **kwargs) or True)
2008
911
        
2009
912
        logger.debug(u"Starting main loop")
 
913
        main_loop_started = True
2010
914
        main_loop.run()
2011
915
    except AvahiError, error:
2012
 
        logger.critical(u"AvahiError: %s", error)
2013
 
        cleanup()
 
916
        logger.critical(u"AvahiError: %s" + unicode(error))
2014
917
        sys.exit(1)
2015
918
    except KeyboardInterrupt:
2016
919
        if debug:
2017
 
            print >> sys.stderr
2018
 
        logger.debug(u"Server received KeyboardInterrupt")
2019
 
    logger.debug(u"Server exiting")
2020
 
    # Must run before the D-Bus bus name gets deregistered
2021
 
    cleanup()
 
920
            print
2022
921
 
2023
922
if __name__ == '__main__':
2024
923
    main()