/mandos/trunk

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  • Committer: Björn Påhlsson
  • Date: 2008-07-20 02:52:20 UTC
  • Revision ID: belorn@braxen-20080720025220-r5u0388uy9iu23h6
Added following support:
Pluginbased client handler
rewritten Mandos client
       Avahi instead of udp server discovery
       openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server

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#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
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".
12
 
13
 
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
16
 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
31
 
# Contact the authors at <mandos@fukt.bsnet.se>.
32
 
33
 
 
34
 
from __future__ import division, with_statement, absolute_import
35
 
 
36
 
import SocketServer as socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
37
6
import socket
38
 
import optparse
 
7
import select
 
8
from optparse import OptionParser
39
9
import datetime
40
10
import errno
41
11
import gnutls.crypto
44
14
import gnutls.library.functions
45
15
import gnutls.library.constants
46
16
import gnutls.library.types
47
 
import ConfigParser as configparser
 
17
import ConfigParser
48
18
import sys
49
19
import re
50
20
import os
51
21
import signal
 
22
from sets import Set
52
23
import subprocess
53
 
import atexit
54
 
import stat
55
 
import logging
56
 
import logging.handlers
57
 
import pwd
58
 
import contextlib
59
 
import struct
60
 
import fcntl
61
 
import functools
62
 
import cPickle as pickle
63
 
import multiprocessing
64
24
 
65
25
import dbus
66
 
import dbus.service
67
26
import gobject
68
27
import avahi
69
28
from dbus.mainloop.glib import DBusGMainLoop
70
29
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.Logger(u'mandos')
87
 
syslogger = (logging.handlers.SysLogHandler
88
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
89
 
              address = "/dev/log"))
90
 
syslogger.setFormatter(logging.Formatter
91
 
                       (u'Mandos [%(process)d]: %(levelname)s:'
92
 
                        u' %(message)s'))
93
 
logger.addHandler(syslogger)
94
 
 
95
 
console = logging.StreamHandler()
96
 
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
97
 
                                       u' %(levelname)s:'
98
 
                                       u' %(message)s'))
99
 
logger.addHandler(console)
100
 
 
101
 
multiprocessing_manager = multiprocessing.Manager()
102
 
 
103
 
class AvahiError(Exception):
104
 
    def __init__(self, value, *args, **kwargs):
105
 
        self.value = value
106
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
107
 
    def __unicode__(self):
108
 
        return unicode(repr(self.value))
109
 
 
110
 
class AvahiServiceError(AvahiError):
111
 
    pass
112
 
 
113
 
class AvahiGroupError(AvahiError):
114
 
    pass
115
 
 
116
 
 
117
 
class AvahiService(object):
118
 
    """An Avahi (Zeroconf) service.
119
 
    
120
 
    Attributes:
121
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
122
 
               Used to optionally bind to the specified interface.
123
 
    name: string; Example: u'Mandos'
124
 
    type: string; Example: u'_mandos._tcp'.
125
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
126
 
    port: integer; what port to announce
127
 
    TXT: list of strings; TXT record for the service
128
 
    domain: string; Domain to publish on, default to .local if empty.
129
 
    host: string; Host to publish records for, default is localhost
130
 
    max_renames: integer; maximum number of renames
131
 
    rename_count: integer; counter so we only rename after collisions
132
 
                  a sensible number of times
133
 
    group: D-Bus Entry Group
134
 
    server: D-Bus Server
135
 
    bus: dbus.SystemBus()
136
 
    """
137
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
138
 
                 servicetype = None, port = None, TXT = None,
139
 
                 domain = u"", host = u"", max_renames = 32768,
140
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
141
 
        self.interface = interface
142
 
        self.name = name
143
 
        self.type = servicetype
144
 
        self.port = port
145
 
        self.TXT = TXT if TXT is not None else []
146
 
        self.domain = domain
147
 
        self.host = host
148
 
        self.rename_count = 0
149
 
        self.max_renames = max_renames
150
 
        self.protocol = protocol
151
 
        self.group = None       # our entry group
152
 
        self.server = None
153
 
        self.bus = bus
154
 
    def rename(self):
155
 
        """Derived from the Avahi example code"""
156
 
        if self.rename_count >= self.max_renames:
157
 
            logger.critical(u"No suitable Zeroconf service name found"
158
 
                            u" after %i retries, exiting.",
159
 
                            self.rename_count)
160
 
            raise AvahiServiceError(u"Too many renames")
161
 
        self.name = self.server.GetAlternativeServiceName(self.name)
162
 
        logger.info(u"Changing Zeroconf service name to %r ...",
163
 
                    unicode(self.name))
164
 
        syslogger.setFormatter(logging.Formatter
165
 
                               (u'Mandos (%s) [%%(process)d]:'
166
 
                                u' %%(levelname)s: %%(message)s'
167
 
                                % self.name))
168
 
        self.remove()
169
 
        self.add()
170
 
        self.rename_count += 1
171
 
    def remove(self):
172
 
        """Derived from the Avahi example code"""
173
 
        if self.group is not None:
174
 
            self.group.Reset()
175
 
    def add(self):
176
 
        """Derived from the Avahi example code"""
177
 
        if self.group is None:
178
 
            self.group = dbus.Interface(
179
 
                self.bus.get_object(avahi.DBUS_NAME,
180
 
                                    self.server.EntryGroupNew()),
181
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
182
 
            self.group.connect_to_signal('StateChanged',
183
 
                                         self
184
 
                                         .entry_group_state_changed)
185
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
186
 
                     self.name, self.type)
187
 
        self.group.AddService(
188
 
            self.interface,
189
 
            self.protocol,
190
 
            dbus.UInt32(0),     # flags
191
 
            self.name, self.type,
192
 
            self.domain, self.host,
193
 
            dbus.UInt16(self.port),
194
 
            avahi.string_array_to_txt_array(self.TXT))
195
 
        self.group.Commit()
196
 
    def entry_group_state_changed(self, state, error):
197
 
        """Derived from the Avahi example code"""
198
 
        logger.debug(u"Avahi state change: %i", state)
199
 
        
200
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
201
 
            logger.debug(u"Zeroconf service established.")
202
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
203
 
            logger.warning(u"Zeroconf service name collision.")
204
 
            self.rename()
205
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
206
 
            logger.critical(u"Avahi: Error in group state changed %s",
207
 
                            unicode(error))
208
 
            raise AvahiGroupError(u"State changed: %s"
209
 
                                  % unicode(error))
210
 
    def cleanup(self):
211
 
        """Derived from the Avahi example code"""
212
 
        if self.group is not None:
213
 
            self.group.Free()
214
 
            self.group = None
215
 
    def server_state_changed(self, state):
216
 
        """Derived from the Avahi example code"""
217
 
        if state == avahi.SERVER_COLLISION:
218
 
            logger.error(u"Zeroconf server name collision")
219
 
            self.remove()
220
 
        elif state == avahi.SERVER_RUNNING:
221
 
            self.add()
222
 
    def activate(self):
223
 
        """Derived from the Avahi example code"""
224
 
        if self.server is None:
225
 
            self.server = dbus.Interface(
226
 
                self.bus.get_object(avahi.DBUS_NAME,
227
 
                                    avahi.DBUS_PATH_SERVER),
228
 
                avahi.DBUS_INTERFACE_SERVER)
229
 
        self.server.connect_to_signal(u"StateChanged",
230
 
                                 self.server_state_changed)
231
 
        self.server_state_changed(self.server.GetState())
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
 
36
logger = logging.Logger('mandos')
 
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
 
38
 
 
39
# This variable is used to optionally bind to a specified interface.
 
40
# It is a global variable to fit in with the other variables from the
 
41
# Avahi server example code.
 
42
serviceInterface = avahi.IF_UNSPEC
 
43
# From the Avahi server example code:
 
44
serviceName = "Mandos"
 
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
46
servicePort = None                      # Not known at startup
 
47
serviceTXT = []                         # TXT record for the service
 
48
domain = ""                  # Domain to publish on, default to .local
 
49
host = ""          # Host to publish records for, default to localhost
 
50
group = None #our entry group
 
51
rename_count = 12       # Counter so we only rename after collisions a
 
52
                        # sensible number of times
 
53
# End of Avahi example code
232
54
 
233
55
 
234
56
class Client(object):
235
57
    """A representation of a client host served by this server.
236
 
    
237
58
    Attributes:
238
 
    name:       string; from the config file, used in log messages and
239
 
                        D-Bus identifiers
 
59
    name:      string; from the config file, used in log messages
240
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
241
61
                 uniquely identify the client
242
 
    secret:     bytestring; sent verbatim (over TLS) to client
243
 
    host:       string; available for use by the checker command
244
 
    created:    datetime.datetime(); (UTC) object creation
245
 
    last_enabled: datetime.datetime(); (UTC)
246
 
    enabled:    bool()
247
 
    last_checked_ok: datetime.datetime(); (UTC) or None
248
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
249
 
                                      until this client is disabled
250
 
    interval:   datetime.timedelta(); How often to start a new checker
251
 
    disable_hook:  If set, called by disable() as disable_hook(self)
252
 
    checker:    subprocess.Popen(); a running checker process used
253
 
                                    to see if the client lives.
254
 
                                    'None' if no process is running.
 
62
    secret:    bytestring; sent verbatim (over TLS) to client
 
63
    fqdn:      string (FQDN); available for use by the checker command
 
64
    created:   datetime.datetime()
 
65
    last_seen: datetime.datetime() or None if not yet seen
 
66
    timeout:   datetime.timedelta(); How long from last_seen until
 
67
                                     this client is invalid
 
68
    interval:  datetime.timedelta(); How often to start a new checker
 
69
    stop_hook: If set, called by stop() as stop_hook(self)
 
70
    checker:   subprocess.Popen(); a running checker process used
 
71
                                   to see if the client lives.
 
72
                                   Is None if no process is running.
255
73
    checker_initiator_tag: a gobject event source tag, or None
256
 
    disable_initiator_tag: - '' -
 
74
    stop_initiator_tag:    - '' -
257
75
    checker_callback_tag:  - '' -
258
76
    checker_command: string; External command which is run to check if
259
 
                     client lives.  %() expansions are done at
 
77
                     client lives.  %()s expansions are done at
260
78
                     runtime with vars(self) as dict, so that for
261
79
                     instance %(name)s can be used in the command.
262
 
    current_checker_command: string; current running checker_command
263
 
    approved_delay: datetime.timedelta(); Time to wait for approval
264
 
    _approved:   bool(); 'None' if not yet approved/disapproved
265
 
    approved_duration: datetime.timedelta(); Duration of one approval
 
80
    Private attibutes:
 
81
    _timeout: Real variable for 'timeout'
 
82
    _interval: Real variable for 'interval'
 
83
    _timeout_milliseconds: Used by gobject.timeout_add()
 
84
    _interval_milliseconds: - '' -
266
85
    """
267
 
    
268
 
    @staticmethod
269
 
    def _timedelta_to_milliseconds(td):
270
 
        "Convert a datetime.timedelta() to milliseconds"
271
 
        return ((td.days * 24 * 60 * 60 * 1000)
272
 
                + (td.seconds * 1000)
273
 
                + (td.microseconds // 1000))
274
 
    
275
 
    def timeout_milliseconds(self):
276
 
        "Return the 'timeout' attribute in milliseconds"
277
 
        return self._timedelta_to_milliseconds(self.timeout)
278
 
    
279
 
    def interval_milliseconds(self):
280
 
        "Return the 'interval' attribute in milliseconds"
281
 
        return self._timedelta_to_milliseconds(self.interval)
282
 
 
283
 
    def approved_delay_milliseconds(self):
284
 
        return self._timedelta_to_milliseconds(self.approved_delay)
285
 
    
286
 
    def __init__(self, name = None, disable_hook=None, config=None):
287
 
        """Note: the 'checker' key in 'config' sets the
288
 
        'checker_command' attribute and *not* the 'checker'
289
 
        attribute."""
 
86
    def _set_timeout(self, timeout):
 
87
        "Setter function for 'timeout' attribute"
 
88
        self._timeout = timeout
 
89
        self._timeout_milliseconds = ((self.timeout.days
 
90
                                       * 24 * 60 * 60 * 1000)
 
91
                                      + (self.timeout.seconds * 1000)
 
92
                                      + (self.timeout.microseconds
 
93
                                         // 1000))
 
94
    timeout = property(lambda self: self._timeout,
 
95
                       _set_timeout)
 
96
    del _set_timeout
 
97
    def _set_interval(self, interval):
 
98
        "Setter function for 'interval' attribute"
 
99
        self._interval = interval
 
100
        self._interval_milliseconds = ((self.interval.days
 
101
                                        * 24 * 60 * 60 * 1000)
 
102
                                       + (self.interval.seconds
 
103
                                          * 1000)
 
104
                                       + (self.interval.microseconds
 
105
                                          // 1000))
 
106
    interval = property(lambda self: self._interval,
 
107
                        _set_interval)
 
108
    del _set_interval
 
109
    def __init__(self, name=None, options=None, stop_hook=None,
 
110
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
111
                 timeout=None, interval=-1, checker=None):
290
112
        self.name = name
291
 
        if config is None:
292
 
            config = {}
293
 
        logger.debug(u"Creating client %r", self.name)
294
 
        # Uppercase and remove spaces from fingerprint for later
295
 
        # comparison purposes with return value from the fingerprint()
296
 
        # function
297
 
        self.fingerprint = (config[u"fingerprint"].upper()
298
 
                            .replace(u" ", u""))
299
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
300
 
        if u"secret" in config:
301
 
            self.secret = config[u"secret"].decode(u"base64")
302
 
        elif u"secfile" in config:
303
 
            with open(os.path.expanduser(os.path.expandvars
304
 
                                         (config[u"secfile"])),
305
 
                      "rb") as secfile:
306
 
                self.secret = secfile.read()
307
 
        else:
308
 
            #XXX Need to allow secret on demand!
309
 
            raise TypeError(u"No secret or secfile for client %s"
310
 
                            % self.name)
311
 
        self.host = config.get(u"host", u"")
312
 
        self.created = datetime.datetime.utcnow()
313
 
        self.enabled = False
314
 
        self.last_enabled = None
315
 
        self.last_checked_ok = None
316
 
        self.timeout = string_to_delta(config[u"timeout"])
317
 
        self.interval = string_to_delta(config[u"interval"])
318
 
        self.disable_hook = disable_hook
 
113
        # Uppercase and remove spaces from fingerprint
 
114
        # for later comparison purposes with return value of
 
115
        # the fingerprint() function
 
116
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
117
        if secret:
 
118
            self.secret = secret.decode(u"base64")
 
119
        elif secfile:
 
120
            sf = open(secfile)
 
121
            self.secret = sf.read()
 
122
            sf.close()
 
123
        else:
 
124
            raise RuntimeError(u"No secret or secfile for client %s"
 
125
                               % self.name)
 
126
        self.fqdn = fqdn                # string
 
127
        self.created = datetime.datetime.now()
 
128
        self.last_seen = None
 
129
        if timeout is None:
 
130
            timeout = options.timeout
 
131
        self.timeout = timeout
 
132
        if interval == -1:
 
133
            interval = options.interval
 
134
        else:
 
135
            interval = string_to_delta(interval)
 
136
        self.interval = interval
 
137
        self.stop_hook = stop_hook
319
138
        self.checker = None
320
139
        self.checker_initiator_tag = None
321
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
322
141
        self.checker_callback_tag = None
323
 
        self.checker_command = config[u"checker"]
324
 
        self.current_checker_command = None
325
 
        self.last_connect = None
326
 
        self.approvals_pending = 0
327
 
        self._approved = None
328
 
        self.approved_by_default = config.get(u"approved_by_default",
329
 
                                              False)
330
 
        self.approved_delay = string_to_delta(
331
 
            config[u"approved_delay"])
332
 
        self.approved_duration = string_to_delta(
333
 
            config[u"approved_duration"])
334
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
335
 
 
336
 
    def send_changedstate(self):
337
 
        self.changedstate.acquire()
338
 
        self.changedstate.notify_all()
339
 
        self.changedstate.release()
340
 
        
341
 
    def enable(self):
342
 
        """Start this client's checker and timeout hooks"""
343
 
        if getattr(self, u"enabled", False):
344
 
            # Already enabled
345
 
            return
346
 
        self.send_changedstate()
347
 
        self.last_enabled = datetime.datetime.utcnow()
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
348
145
        # Schedule a new checker to be started an 'interval' from now,
349
146
        # and every interval from then on.
350
 
        self.checker_initiator_tag = (gobject.timeout_add
351
 
                                      (self.interval_milliseconds(),
352
 
                                       self.start_checker))
353
 
        # Schedule a disable() when 'timeout' has passed
354
 
        self.disable_initiator_tag = (gobject.timeout_add
355
 
                                   (self.timeout_milliseconds(),
356
 
                                    self.disable))
357
 
        self.enabled = True
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
358
150
        # Also start a new checker *right now*.
359
151
        self.start_checker()
360
 
    
361
 
    def disable(self, quiet=True):
362
 
        """Disable this client."""
363
 
        if not getattr(self, "enabled", False):
364
 
            return False
365
 
        if not quiet:
366
 
            self.send_changedstate()
367
 
        if not quiet:
368
 
            logger.info(u"Disabling client %s", self.name)
369
 
        if getattr(self, u"disable_initiator_tag", False):
370
 
            gobject.source_remove(self.disable_initiator_tag)
371
 
            self.disable_initiator_tag = None
372
 
        if getattr(self, u"checker_initiator_tag", False):
 
152
        # Schedule a stop() when 'timeout' has passed
 
153
        self.stop_initiator_tag = gobject.timeout_add\
 
154
                                  (self._timeout_milliseconds,
 
155
                                   self.stop)
 
156
    def stop(self):
 
157
        """Stop this client.
 
158
        The possibility that this client might be restarted is left
 
159
        open, but not currently used."""
 
160
        logger.debug(u"Stopping client %s", self.name)
 
161
        self.secret = None
 
162
        if self.stop_initiator_tag:
 
163
            gobject.source_remove(self.stop_initiator_tag)
 
164
            self.stop_initiator_tag = None
 
165
        if self.checker_initiator_tag:
373
166
            gobject.source_remove(self.checker_initiator_tag)
374
167
            self.checker_initiator_tag = None
375
168
        self.stop_checker()
376
 
        if self.disable_hook:
377
 
            self.disable_hook(self)
378
 
        self.enabled = False
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
379
171
        # Do not run this again if called by a gobject.timeout_add
380
172
        return False
381
 
    
382
173
    def __del__(self):
383
 
        self.disable_hook = None
384
 
        self.disable()
385
 
    
386
 
    def checker_callback(self, pid, condition, command):
 
174
        # Some code duplication here and in stop()
 
175
        if hasattr(self, "stop_initiator_tag") \
 
176
               and self.stop_initiator_tag:
 
177
            gobject.source_remove(self.stop_initiator_tag)
 
178
            self.stop_initiator_tag = None
 
179
        if hasattr(self, "checker_initiator_tag") \
 
180
               and self.checker_initiator_tag:
 
181
            gobject.source_remove(self.checker_initiator_tag)
 
182
            self.checker_initiator_tag = None
 
183
        self.stop_checker()
 
184
    def checker_callback(self, pid, condition):
387
185
        """The checker has completed, so take appropriate actions."""
388
 
        self.checker_callback_tag = None
389
 
        self.checker = None
390
 
        if os.WIFEXITED(condition):
391
 
            exitstatus = os.WEXITSTATUS(condition)
392
 
            if exitstatus == 0:
393
 
                logger.info(u"Checker for %(name)s succeeded",
394
 
                            vars(self))
395
 
                self.checked_ok()
396
 
            else:
397
 
                logger.info(u"Checker for %(name)s failed",
398
 
                            vars(self))
399
 
        else:
 
186
        now = datetime.datetime.now()
 
187
        if os.WIFEXITED(condition) \
 
188
               and (os.WEXITSTATUS(condition) == 0):
 
189
            logger.debug(u"Checker for %(name)s succeeded",
 
190
                         vars(self))
 
191
            self.last_seen = now
 
192
            gobject.source_remove(self.stop_initiator_tag)
 
193
            self.stop_initiator_tag = gobject.timeout_add\
 
194
                                      (self._timeout_milliseconds,
 
195
                                       self.stop)
 
196
        if not os.WIFEXITED(condition):
400
197
            logger.warning(u"Checker for %(name)s crashed?",
401
198
                           vars(self))
402
 
    
403
 
    def checked_ok(self):
404
 
        """Bump up the timeout for this client.
405
 
        
406
 
        This should only be called when the client has been seen,
407
 
        alive and well.
408
 
        """
409
 
        self.last_checked_ok = datetime.datetime.utcnow()
410
 
        gobject.source_remove(self.disable_initiator_tag)
411
 
        self.disable_initiator_tag = (gobject.timeout_add
412
 
                                      (self.timeout_milliseconds(),
413
 
                                       self.disable))
414
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
415
204
    def start_checker(self):
416
205
        """Start a new checker subprocess if one is not running.
417
 
        
418
206
        If a checker already exists, leave it running and do
419
207
        nothing."""
420
 
        # The reason for not killing a running checker is that if we
421
 
        # did that, then if a checker (for some reason) started
422
 
        # running slowly and taking more than 'interval' time, the
423
 
        # client would inevitably timeout, since no checker would get
424
 
        # a chance to run to completion.  If we instead leave running
425
 
        # checkers alone, the checker would have to take more time
426
 
        # than 'timeout' for the client to be disabled, which is as it
427
 
        # should be.
428
 
        
429
 
        # If a checker exists, make sure it is not a zombie
430
 
        try:
431
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
432
 
        except (AttributeError, OSError), error:
433
 
            if (isinstance(error, OSError)
434
 
                and error.errno != errno.ECHILD):
435
 
                raise error
436
 
        else:
437
 
            if pid:
438
 
                logger.warning(u"Checker was a zombie")
439
 
                gobject.source_remove(self.checker_callback_tag)
440
 
                self.checker_callback(pid, status,
441
 
                                      self.current_checker_command)
442
 
        # Start a new checker if needed
443
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
444
211
            try:
445
 
                # In case checker_command has exactly one % operator
446
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
447
213
            except TypeError:
448
 
                # Escape attributes for the shell
449
 
                escaped_attrs = dict((key,
450
 
                                      re.escape(unicode(str(val),
451
 
                                                        errors=
452
 
                                                        u'replace')))
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
453
215
                                     for key, val in
454
216
                                     vars(self).iteritems())
455
217
                try:
456
 
                    command = self.checker_command % escaped_attrs
 
218
                    command = self.check_command % escaped_attrs
457
219
                except TypeError, error:
458
 
                    logger.error(u'Could not format string "%s":'
459
 
                                 u' %s', self.checker_command, error)
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
460
222
                    return True # Try again later
461
 
            self.current_checker_command = command
462
223
            try:
463
 
                logger.info(u"Starting checker %r for %s",
464
 
                            command, self.name)
465
 
                # We don't need to redirect stdout and stderr, since
466
 
                # in normal mode, that is already done by daemon(),
467
 
                # and in debug mode we don't want to.  (Stdin is
468
 
                # always replaced by /dev/null.)
469
 
                self.checker = subprocess.Popen(command,
470
 
                                                close_fds=True,
471
 
                                                shell=True, cwd=u"/")
472
 
                self.checker_callback_tag = (gobject.child_watch_add
473
 
                                             (self.checker.pid,
474
 
                                              self.checker_callback,
475
 
                                              data=command))
476
 
                # The checker may have completed before the gobject
477
 
                # watch was added.  Check for this.
478
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
479
 
                if pid:
480
 
                    gobject.source_remove(self.checker_callback_tag)
481
 
                    self.checker_callback(pid, status, command)
482
 
            except OSError, error:
 
224
                self.checker = subprocess.\
 
225
                               Popen(command,
 
226
                                     stdout=subprocess.PIPE,
 
227
                                     close_fds=True, shell=True,
 
228
                                     cwd="/")
 
229
                self.checker_callback_tag = gobject.\
 
230
                                            child_watch_add(self.checker.pid,
 
231
                                                            self.\
 
232
                                                            checker_callback)
 
233
            except subprocess.OSError, error:
483
234
                logger.error(u"Failed to start subprocess: %s",
484
235
                             error)
485
236
        # Re-run this periodically if run by gobject.timeout_add
486
237
        return True
487
 
    
488
238
    def stop_checker(self):
489
239
        """Force the checker process, if any, to stop."""
490
 
        if self.checker_callback_tag:
491
 
            gobject.source_remove(self.checker_callback_tag)
492
 
            self.checker_callback_tag = None
493
 
        if getattr(self, u"checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
494
241
            return
495
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
496
 
        try:
497
 
            os.kill(self.checker.pid, signal.SIGTERM)
498
 
            #time.sleep(0.5)
499
 
            #if self.checker.poll() is None:
500
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
501
 
        except OSError, error:
502
 
            if error.errno != errno.ESRCH: # No such process
503
 
                raise
504
 
        self.checker = None
505
 
 
506
 
def dbus_service_property(dbus_interface, signature=u"v",
507
 
                          access=u"readwrite", byte_arrays=False):
508
 
    """Decorators for marking methods of a DBusObjectWithProperties to
509
 
    become properties on the D-Bus.
510
 
    
511
 
    The decorated method will be called with no arguments by "Get"
512
 
    and with one argument by "Set".
513
 
    
514
 
    The parameters, where they are supported, are the same as
515
 
    dbus.service.method, except there is only "signature", since the
516
 
    type from Get() and the type sent to Set() is the same.
517
 
    """
518
 
    # Encoding deeply encoded byte arrays is not supported yet by the
519
 
    # "Set" method, so we fail early here:
520
 
    if byte_arrays and signature != u"ay":
521
 
        raise ValueError(u"Byte arrays not supported for non-'ay'"
522
 
                         u" signature %r" % signature)
523
 
    def decorator(func):
524
 
        func._dbus_is_property = True
525
 
        func._dbus_interface = dbus_interface
526
 
        func._dbus_signature = signature
527
 
        func._dbus_access = access
528
 
        func._dbus_name = func.__name__
529
 
        if func._dbus_name.endswith(u"_dbus_property"):
530
 
            func._dbus_name = func._dbus_name[:-14]
531
 
        func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
532
 
        return func
533
 
    return decorator
534
 
 
535
 
 
536
 
class DBusPropertyException(dbus.exceptions.DBusException):
537
 
    """A base class for D-Bus property-related exceptions
538
 
    """
539
 
    def __unicode__(self):
540
 
        return unicode(str(self))
541
 
 
542
 
 
543
 
class DBusPropertyAccessException(DBusPropertyException):
544
 
    """A property's access permissions disallows an operation.
545
 
    """
546
 
    pass
547
 
 
548
 
 
549
 
class DBusPropertyNotFound(DBusPropertyException):
550
 
    """An attempt was made to access a non-existing property.
551
 
    """
552
 
    pass
553
 
 
554
 
 
555
 
class DBusObjectWithProperties(dbus.service.Object):
556
 
    """A D-Bus object with properties.
557
 
 
558
 
    Classes inheriting from this can use the dbus_service_property
559
 
    decorator to expose methods as D-Bus properties.  It exposes the
560
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
561
 
    """
562
 
    
563
 
    @staticmethod
564
 
    def _is_dbus_property(obj):
565
 
        return getattr(obj, u"_dbus_is_property", False)
566
 
    
567
 
    def _get_all_dbus_properties(self):
568
 
        """Returns a generator of (name, attribute) pairs
569
 
        """
570
 
        return ((prop._dbus_name, prop)
571
 
                for name, prop in
572
 
                inspect.getmembers(self, self._is_dbus_property))
573
 
    
574
 
    def _get_dbus_property(self, interface_name, property_name):
575
 
        """Returns a bound method if one exists which is a D-Bus
576
 
        property with the specified name and interface.
577
 
        """
578
 
        for name in (property_name,
579
 
                     property_name + u"_dbus_property"):
580
 
            prop = getattr(self, name, None)
581
 
            if (prop is None
582
 
                or not self._is_dbus_property(prop)
583
 
                or prop._dbus_name != property_name
584
 
                or (interface_name and prop._dbus_interface
585
 
                    and interface_name != prop._dbus_interface)):
586
 
                continue
587
 
            return prop
588
 
        # No such property
589
 
        raise DBusPropertyNotFound(self.dbus_object_path + u":"
590
 
                                   + interface_name + u"."
591
 
                                   + property_name)
592
 
    
593
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
594
 
                         out_signature=u"v")
595
 
    def Get(self, interface_name, property_name):
596
 
        """Standard D-Bus property Get() method, see D-Bus standard.
597
 
        """
598
 
        prop = self._get_dbus_property(interface_name, property_name)
599
 
        if prop._dbus_access == u"write":
600
 
            raise DBusPropertyAccessException(property_name)
601
 
        value = prop()
602
 
        if not hasattr(value, u"variant_level"):
603
 
            return value
604
 
        return type(value)(value, variant_level=value.variant_level+1)
605
 
    
606
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
607
 
    def Set(self, interface_name, property_name, value):
608
 
        """Standard D-Bus property Set() method, see D-Bus standard.
609
 
        """
610
 
        prop = self._get_dbus_property(interface_name, property_name)
611
 
        if prop._dbus_access == u"read":
612
 
            raise DBusPropertyAccessException(property_name)
613
 
        if prop._dbus_get_args_options[u"byte_arrays"]:
614
 
            # The byte_arrays option is not supported yet on
615
 
            # signatures other than "ay".
616
 
            if prop._dbus_signature != u"ay":
617
 
                raise ValueError
618
 
            value = dbus.ByteArray(''.join(unichr(byte)
619
 
                                           for byte in value))
620
 
        prop(value)
621
 
    
622
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
623
 
                         out_signature=u"a{sv}")
624
 
    def GetAll(self, interface_name):
625
 
        """Standard D-Bus property GetAll() method, see D-Bus
626
 
        standard.
627
 
 
628
 
        Note: Will not include properties with access="write".
629
 
        """
630
 
        all = {}
631
 
        for name, prop in self._get_all_dbus_properties():
632
 
            if (interface_name
633
 
                and interface_name != prop._dbus_interface):
634
 
                # Interface non-empty but did not match
635
 
                continue
636
 
            # Ignore write-only properties
637
 
            if prop._dbus_access == u"write":
638
 
                continue
639
 
            value = prop()
640
 
            if not hasattr(value, u"variant_level"):
641
 
                all[name] = value
642
 
                continue
643
 
            all[name] = type(value)(value, variant_level=
644
 
                                    value.variant_level+1)
645
 
        return dbus.Dictionary(all, signature=u"sv")
646
 
    
647
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
648
 
                         out_signature=u"s",
649
 
                         path_keyword='object_path',
650
 
                         connection_keyword='connection')
651
 
    def Introspect(self, object_path, connection):
652
 
        """Standard D-Bus method, overloaded to insert property tags.
653
 
        """
654
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
655
 
                                                   connection)
656
 
        try:
657
 
            document = xml.dom.minidom.parseString(xmlstring)
658
 
            def make_tag(document, name, prop):
659
 
                e = document.createElement(u"property")
660
 
                e.setAttribute(u"name", name)
661
 
                e.setAttribute(u"type", prop._dbus_signature)
662
 
                e.setAttribute(u"access", prop._dbus_access)
663
 
                return e
664
 
            for if_tag in document.getElementsByTagName(u"interface"):
665
 
                for tag in (make_tag(document, name, prop)
666
 
                            for name, prop
667
 
                            in self._get_all_dbus_properties()
668
 
                            if prop._dbus_interface
669
 
                            == if_tag.getAttribute(u"name")):
670
 
                    if_tag.appendChild(tag)
671
 
                # Add the names to the return values for the
672
 
                # "org.freedesktop.DBus.Properties" methods
673
 
                if (if_tag.getAttribute(u"name")
674
 
                    == u"org.freedesktop.DBus.Properties"):
675
 
                    for cn in if_tag.getElementsByTagName(u"method"):
676
 
                        if cn.getAttribute(u"name") == u"Get":
677
 
                            for arg in cn.getElementsByTagName(u"arg"):
678
 
                                if (arg.getAttribute(u"direction")
679
 
                                    == u"out"):
680
 
                                    arg.setAttribute(u"name", u"value")
681
 
                        elif cn.getAttribute(u"name") == u"GetAll":
682
 
                            for arg in cn.getElementsByTagName(u"arg"):
683
 
                                if (arg.getAttribute(u"direction")
684
 
                                    == u"out"):
685
 
                                    arg.setAttribute(u"name", u"props")
686
 
            xmlstring = document.toxml(u"utf-8")
687
 
            document.unlink()
688
 
        except (AttributeError, xml.dom.DOMException,
689
 
                xml.parsers.expat.ExpatError), error:
690
 
            logger.error(u"Failed to override Introspection method",
691
 
                         error)
692
 
        return xmlstring
693
 
 
694
 
 
695
 
class ClientDBus(Client, DBusObjectWithProperties):
696
 
    """A Client class using D-Bus
697
 
    
698
 
    Attributes:
699
 
    dbus_object_path: dbus.ObjectPath
700
 
    bus: dbus.SystemBus()
701
 
    """
702
 
    # dbus.service.Object doesn't use super(), so we can't either.
703
 
    
704
 
    def __init__(self, bus = None, *args, **kwargs):
705
 
        self.bus = bus
706
 
        Client.__init__(self, *args, **kwargs)
707
 
        # Only now, when this client is initialized, can it show up on
708
 
        # the D-Bus
709
 
        self.dbus_object_path = (dbus.ObjectPath
710
 
                                 (u"/clients/"
711
 
                                  + self.name.replace(u".", u"_")))
712
 
        DBusObjectWithProperties.__init__(self, self.bus,
713
 
                                          self.dbus_object_path)
714
 
    
715
 
    @staticmethod
716
 
    def _datetime_to_dbus(dt, variant_level=0):
717
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
718
 
        return dbus.String(dt.isoformat(),
719
 
                           variant_level=variant_level)
720
 
    
721
 
    def enable(self):
722
 
        oldstate = getattr(self, u"enabled", False)
723
 
        r = Client.enable(self)
724
 
        if oldstate != self.enabled:
725
 
            # Emit D-Bus signals
726
 
            self.PropertyChanged(dbus.String(u"enabled"),
727
 
                                 dbus.Boolean(True, variant_level=1))
728
 
            self.PropertyChanged(
729
 
                dbus.String(u"last_enabled"),
730
 
                self._datetime_to_dbus(self.last_enabled,
731
 
                                       variant_level=1))
732
 
        return r
733
 
    
734
 
    def disable(self, quiet = False):
735
 
        oldstate = getattr(self, u"enabled", False)
736
 
        r = Client.disable(self, quiet=quiet)
737
 
        if not quiet and oldstate != self.enabled:
738
 
            # Emit D-Bus signal
739
 
            self.PropertyChanged(dbus.String(u"enabled"),
740
 
                                 dbus.Boolean(False, variant_level=1))
741
 
        return r
742
 
    
743
 
    def __del__(self, *args, **kwargs):
744
 
        try:
745
 
            self.remove_from_connection()
746
 
        except LookupError:
747
 
            pass
748
 
        if hasattr(DBusObjectWithProperties, u"__del__"):
749
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
750
 
        Client.__del__(self, *args, **kwargs)
751
 
    
752
 
    def checker_callback(self, pid, condition, command,
753
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
754
243
        self.checker_callback_tag = None
 
244
        os.kill(self.checker.pid, signal.SIGTERM)
 
245
        if self.checker.poll() is None:
 
246
            os.kill(self.checker.pid, signal.SIGKILL)
755
247
        self.checker = None
756
 
        # Emit D-Bus signal
757
 
        self.PropertyChanged(dbus.String(u"checker_running"),
758
 
                             dbus.Boolean(False, variant_level=1))
759
 
        if os.WIFEXITED(condition):
760
 
            exitstatus = os.WEXITSTATUS(condition)
761
 
            # Emit D-Bus signal
762
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
763
 
                                  dbus.Int64(condition),
764
 
                                  dbus.String(command))
765
 
        else:
766
 
            # Emit D-Bus signal
767
 
            self.CheckerCompleted(dbus.Int16(-1),
768
 
                                  dbus.Int64(condition),
769
 
                                  dbus.String(command))
770
 
        
771
 
        return Client.checker_callback(self, pid, condition, command,
772
 
                                       *args, **kwargs)
773
 
    
774
 
    def checked_ok(self, *args, **kwargs):
775
 
        r = Client.checked_ok(self, *args, **kwargs)
776
 
        # Emit D-Bus signal
777
 
        self.PropertyChanged(
778
 
            dbus.String(u"last_checked_ok"),
779
 
            (self._datetime_to_dbus(self.last_checked_ok,
780
 
                                    variant_level=1)))
781
 
        return r
782
 
    
783
 
    def start_checker(self, *args, **kwargs):
784
 
        old_checker = self.checker
785
 
        if self.checker is not None:
786
 
            old_checker_pid = self.checker.pid
787
 
        else:
788
 
            old_checker_pid = None
789
 
        r = Client.start_checker(self, *args, **kwargs)
790
 
        # Only if new checker process was started
791
 
        if (self.checker is not None
792
 
            and old_checker_pid != self.checker.pid):
793
 
            # Emit D-Bus signal
794
 
            self.CheckerStarted(self.current_checker_command)
795
 
            self.PropertyChanged(
796
 
                dbus.String(u"checker_running"),
797
 
                dbus.Boolean(True, variant_level=1))
798
 
        return r
799
 
    
800
 
    def stop_checker(self, *args, **kwargs):
801
 
        old_checker = getattr(self, u"checker", None)
802
 
        r = Client.stop_checker(self, *args, **kwargs)
803
 
        if (old_checker is not None
804
 
            and getattr(self, u"checker", None) is None):
805
 
            self.PropertyChanged(dbus.String(u"checker_running"),
806
 
                                 dbus.Boolean(False, variant_level=1))
807
 
        return r
808
 
 
809
 
    def _reset_approved(self):
810
 
        self._approved = None
811
 
        return False
812
 
    
813
 
    def approve(self, value=True):
814
 
        self._approved = value
815
 
        gobject.timeout_add(self._timedelta_to_milliseconds(self.approved_duration, self._reset_approved))
816
 
 
817
 
    def approved_pending(self):
818
 
        return self.approvals_pending > 0
819
 
 
820
 
    
821
 
    ## D-Bus methods, signals & properties
822
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
823
 
    
824
 
    ## Signals
825
 
    
826
 
    # CheckerCompleted - signal
827
 
    @dbus.service.signal(_interface, signature=u"nxs")
828
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
829
 
        "D-Bus signal"
830
 
        pass
831
 
    
832
 
    # CheckerStarted - signal
833
 
    @dbus.service.signal(_interface, signature=u"s")
834
 
    def CheckerStarted(self, command):
835
 
        "D-Bus signal"
836
 
        pass
837
 
    
838
 
    # PropertyChanged - signal
839
 
    @dbus.service.signal(_interface, signature=u"sv")
840
 
    def PropertyChanged(self, property, value):
841
 
        "D-Bus signal"
842
 
        pass
843
 
    
844
 
    # GotSecret - signal
845
 
    @dbus.service.signal(_interface)
846
 
    def GotSecret(self):
847
 
        "D-Bus signal"
848
 
        pass
849
 
    
850
 
    # Rejected - signal
851
 
    @dbus.service.signal(_interface, signature=u"s")
852
 
    def Rejected(self, reason):
853
 
        "D-Bus signal"
854
 
        pass
855
 
    
856
 
    # NeedApproval - signal
857
 
    @dbus.service.signal(_interface, signature=u"db")
858
 
    def NeedApproval(self, timeout, default):
859
 
        "D-Bus signal"
860
 
        pass
861
 
    
862
 
    ## Methods
863
 
 
864
 
    # Approve - method
865
 
    @dbus.service.method(_interface, in_signature=u"b")
866
 
    def Approve(self, value):
867
 
        self.approve(value)
868
 
 
869
 
    # CheckedOK - method
870
 
    @dbus.service.method(_interface)
871
 
    def CheckedOK(self):
872
 
        return self.checked_ok()
873
 
    
874
 
    # Enable - method
875
 
    @dbus.service.method(_interface)
876
 
    def Enable(self):
877
 
        "D-Bus method"
878
 
        self.enable()
879
 
    
880
 
    # StartChecker - method
881
 
    @dbus.service.method(_interface)
882
 
    def StartChecker(self):
883
 
        "D-Bus method"
884
 
        self.start_checker()
885
 
    
886
 
    # Disable - method
887
 
    @dbus.service.method(_interface)
888
 
    def Disable(self):
889
 
        "D-Bus method"
890
 
        self.disable()
891
 
    
892
 
    # StopChecker - method
893
 
    @dbus.service.method(_interface)
894
 
    def StopChecker(self):
895
 
        self.stop_checker()
896
 
    
897
 
    ## Properties
898
 
    
899
 
    # approved_pending - property
900
 
    @dbus_service_property(_interface, signature=u"b", access=u"read")
901
 
    def approved_pending_dbus_property(self):
902
 
        return dbus.Boolean(self.approved_pending())
903
 
    
904
 
    # approved_by_default - property
905
 
    @dbus_service_property(_interface, signature=u"b",
906
 
                           access=u"readwrite")
907
 
    def approved_by_default_dbus_property(self):
908
 
        return dbus.Boolean(self.approved_by_default)
909
 
    
910
 
    # approved_delay - property
911
 
    @dbus_service_property(_interface, signature=u"t",
912
 
                           access=u"readwrite")
913
 
    def approved_delay_dbus_property(self):
914
 
        return dbus.UInt64(self.approved_delay_milliseconds())
915
 
    
916
 
    # approved_duration - property
917
 
    @dbus_service_property(_interface, signature=u"t",
918
 
                           access=u"readwrite")
919
 
    def approved_duration_dbus_property(self):
920
 
        return dbus.UInt64(self._timedelta_to_milliseconds(
921
 
                self.approved_duration))
922
 
    
923
 
    # name - property
924
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
925
 
    def name_dbus_property(self):
926
 
        return dbus.String(self.name)
927
 
    
928
 
    # fingerprint - property
929
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
930
 
    def fingerprint_dbus_property(self):
931
 
        return dbus.String(self.fingerprint)
932
 
    
933
 
    # host - property
934
 
    @dbus_service_property(_interface, signature=u"s",
935
 
                           access=u"readwrite")
936
 
    def host_dbus_property(self, value=None):
937
 
        if value is None:       # get
938
 
            return dbus.String(self.host)
939
 
        self.host = value
940
 
        # Emit D-Bus signal
941
 
        self.PropertyChanged(dbus.String(u"host"),
942
 
                             dbus.String(value, variant_level=1))
943
 
    
944
 
    # created - property
945
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
946
 
    def created_dbus_property(self):
947
 
        return dbus.String(self._datetime_to_dbus(self.created))
948
 
    
949
 
    # last_enabled - property
950
 
    @dbus_service_property(_interface, signature=u"s", access=u"read")
951
 
    def last_enabled_dbus_property(self):
952
 
        if self.last_enabled is None:
953
 
            return dbus.String(u"")
954
 
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
955
 
    
956
 
    # enabled - property
957
 
    @dbus_service_property(_interface, signature=u"b",
958
 
                           access=u"readwrite")
959
 
    def enabled_dbus_property(self, value=None):
960
 
        if value is None:       # get
961
 
            return dbus.Boolean(self.enabled)
962
 
        if value:
963
 
            self.enable()
964
 
        else:
965
 
            self.disable()
966
 
    
967
 
    # last_checked_ok - property
968
 
    @dbus_service_property(_interface, signature=u"s",
969
 
                           access=u"readwrite")
970
 
    def last_checked_ok_dbus_property(self, value=None):
971
 
        if value is not None:
972
 
            self.checked_ok()
973
 
            return
974
 
        if self.last_checked_ok is None:
975
 
            return dbus.String(u"")
976
 
        return dbus.String(self._datetime_to_dbus(self
977
 
                                                  .last_checked_ok))
978
 
    
979
 
    # timeout - property
980
 
    @dbus_service_property(_interface, signature=u"t",
981
 
                           access=u"readwrite")
982
 
    def timeout_dbus_property(self, value=None):
983
 
        if value is None:       # get
984
 
            return dbus.UInt64(self.timeout_milliseconds())
985
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
986
 
        # Emit D-Bus signal
987
 
        self.PropertyChanged(dbus.String(u"timeout"),
988
 
                             dbus.UInt64(value, variant_level=1))
989
 
        if getattr(self, u"disable_initiator_tag", None) is None:
990
 
            return
991
 
        # Reschedule timeout
992
 
        gobject.source_remove(self.disable_initiator_tag)
993
 
        self.disable_initiator_tag = None
994
 
        time_to_die = (self.
995
 
                       _timedelta_to_milliseconds((self
996
 
                                                   .last_checked_ok
997
 
                                                   + self.timeout)
998
 
                                                  - datetime.datetime
999
 
                                                  .utcnow()))
1000
 
        if time_to_die <= 0:
1001
 
            # The timeout has passed
1002
 
            self.disable()
1003
 
        else:
1004
 
            self.disable_initiator_tag = (gobject.timeout_add
1005
 
                                          (time_to_die, self.disable))
1006
 
    
1007
 
    # interval - property
1008
 
    @dbus_service_property(_interface, signature=u"t",
1009
 
                           access=u"readwrite")
1010
 
    def interval_dbus_property(self, value=None):
1011
 
        if value is None:       # get
1012
 
            return dbus.UInt64(self.interval_milliseconds())
1013
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1014
 
        # Emit D-Bus signal
1015
 
        self.PropertyChanged(dbus.String(u"interval"),
1016
 
                             dbus.UInt64(value, variant_level=1))
1017
 
        if getattr(self, u"checker_initiator_tag", None) is None:
1018
 
            return
1019
 
        # Reschedule checker run
1020
 
        gobject.source_remove(self.checker_initiator_tag)
1021
 
        self.checker_initiator_tag = (gobject.timeout_add
1022
 
                                      (value, self.start_checker))
1023
 
        self.start_checker()    # Start one now, too
1024
 
 
1025
 
    # checker - property
1026
 
    @dbus_service_property(_interface, signature=u"s",
1027
 
                           access=u"readwrite")
1028
 
    def checker_dbus_property(self, value=None):
1029
 
        if value is None:       # get
1030
 
            return dbus.String(self.checker_command)
1031
 
        self.checker_command = value
1032
 
        # Emit D-Bus signal
1033
 
        self.PropertyChanged(dbus.String(u"checker"),
1034
 
                             dbus.String(self.checker_command,
1035
 
                                         variant_level=1))
1036
 
    
1037
 
    # checker_running - property
1038
 
    @dbus_service_property(_interface, signature=u"b",
1039
 
                           access=u"readwrite")
1040
 
    def checker_running_dbus_property(self, value=None):
1041
 
        if value is None:       # get
1042
 
            return dbus.Boolean(self.checker is not None)
1043
 
        if value:
1044
 
            self.start_checker()
1045
 
        else:
1046
 
            self.stop_checker()
1047
 
    
1048
 
    # object_path - property
1049
 
    @dbus_service_property(_interface, signature=u"o", access=u"read")
1050
 
    def object_path_dbus_property(self):
1051
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1052
 
    
1053
 
    # secret = property
1054
 
    @dbus_service_property(_interface, signature=u"ay",
1055
 
                           access=u"write", byte_arrays=True)
1056
 
    def secret_dbus_property(self, value):
1057
 
        self.secret = str(value)
1058
 
    
1059
 
    del _interface
1060
 
 
1061
 
 
1062
 
class ProxyClient(object):
1063
 
    def __init__(self, child_pipe, fpr, address):
1064
 
        self._pipe = child_pipe
1065
 
        self._pipe.send(('init', fpr, address))
1066
 
        if not self._pipe.recv():
1067
 
            raise KeyError()
1068
 
 
1069
 
    def __getattribute__(self, name):
1070
 
        if(name == '_pipe'):
1071
 
            return super(ProxyClient, self).__getattribute__(name)
1072
 
        self._pipe.send(('getattr', name))
1073
 
        data = self._pipe.recv()
1074
 
        if data[0] == 'data':
1075
 
            return data[1]
1076
 
        if data[0] == 'function':
1077
 
            def func(*args, **kwargs):
1078
 
                self._pipe.send(('funcall', name, args, kwargs))
1079
 
                return self._pipe.recv()[1]
1080
 
            return func
1081
 
 
1082
 
    def __setattr__(self, name, value):
1083
 
        if(name == '_pipe'):
1084
 
            return super(ProxyClient, self).__setattr__(name, value)
1085
 
        self._pipe.send(('setattr', name, value))
1086
 
 
1087
 
 
1088
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1089
 
    """A class to handle client connections.
1090
 
    
1091
 
    Instantiated once for each connection to handle it.
 
248
    def still_valid(self, now=None):
 
249
        """Has the timeout not yet passed for this client?"""
 
250
        if now is None:
 
251
            now = datetime.datetime.now()
 
252
        if self.last_seen is None:
 
253
            return now < (self.created + self.timeout)
 
254
        else:
 
255
            return now < (self.last_seen + self.timeout)
 
256
 
 
257
 
 
258
def peer_certificate(session):
 
259
    # If not an OpenPGP certificate...
 
260
    if gnutls.library.functions.gnutls_certificate_type_get\
 
261
            (session._c_object) \
 
262
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
263
        # ...do the normal thing
 
264
        return session.peer_certificate
 
265
    list_size = ctypes.c_uint()
 
266
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
267
        (session._c_object, ctypes.byref(list_size))
 
268
    if list_size.value == 0:
 
269
        return None
 
270
    cert = cert_list[0]
 
271
    return ctypes.string_at(cert.data, cert.size)
 
272
 
 
273
 
 
274
def fingerprint(openpgp):
 
275
    # New empty GnuTLS certificate
 
276
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
277
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
278
        (ctypes.byref(crt))
 
279
    # New GnuTLS "datum" with the OpenPGP public key
 
280
    datum = gnutls.library.types.gnutls_datum_t\
 
281
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
282
                     ctypes.POINTER(ctypes.c_ubyte)),
 
283
         ctypes.c_uint(len(openpgp)))
 
284
    # Import the OpenPGP public key into the certificate
 
285
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
286
        (crt,
 
287
         ctypes.byref(datum),
 
288
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
289
    # New buffer for the fingerprint
 
290
    buffer = ctypes.create_string_buffer(20)
 
291
    buffer_length = ctypes.c_size_t()
 
292
    # Get the fingerprint from the certificate into the buffer
 
293
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
294
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
295
    # Deinit the certificate
 
296
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
297
    # Convert the buffer to a Python bytestring
 
298
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
299
    # Convert the bytestring to hexadecimal notation
 
300
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
301
    return hex_fpr
 
302
 
 
303
 
 
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
305
    """A TCP request handler class.
 
306
    Instantiated by IPv6_TCPServer for each request to handle it.
1092
307
    Note: This will run in its own forked process."""
1093
308
    
1094
309
    def handle(self):
1095
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1096
 
            logger.info(u"TCP connection from: %s",
1097
 
                        unicode(self.client_address))
1098
 
            logger.debug(u"Pipe FD: %d",
1099
 
                         self.server.child_pipe.fileno())
1100
 
 
1101
 
            session = (gnutls.connection
1102
 
                       .ClientSession(self.request,
1103
 
                                      gnutls.connection
1104
 
                                      .X509Credentials()))
1105
 
 
1106
 
            # Note: gnutls.connection.X509Credentials is really a
1107
 
            # generic GnuTLS certificate credentials object so long as
1108
 
            # no X.509 keys are added to it.  Therefore, we can use it
1109
 
            # here despite using OpenPGP certificates.
1110
 
 
1111
 
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
1112
 
            #                      u"+AES-256-CBC", u"+SHA1",
1113
 
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
1114
 
            #                      u"+DHE-DSS"))
1115
 
            # Use a fallback default, since this MUST be set.
1116
 
            priority = self.server.gnutls_priority
1117
 
            if priority is None:
1118
 
                priority = u"NORMAL"
1119
 
            (gnutls.library.functions
1120
 
             .gnutls_priority_set_direct(session._c_object,
1121
 
                                         priority, None))
1122
 
 
1123
 
            # Start communication using the Mandos protocol
1124
 
            # Get protocol number
1125
 
            line = self.request.makefile().readline()
1126
 
            logger.debug(u"Protocol version: %r", line)
1127
 
            try:
1128
 
                if int(line.strip().split()[0]) > 1:
1129
 
                    raise RuntimeError
1130
 
            except (ValueError, IndexError, RuntimeError), error:
1131
 
                logger.error(u"Unknown protocol version: %s", error)
1132
 
                return
1133
 
 
1134
 
            # Start GnuTLS connection
1135
 
            try:
1136
 
                session.handshake()
1137
 
            except gnutls.errors.GNUTLSError, error:
1138
 
                logger.warning(u"Handshake failed: %s", error)
1139
 
                # Do not run session.bye() here: the session is not
1140
 
                # established.  Just abandon the request.
1141
 
                return
1142
 
            logger.debug(u"Handshake succeeded")
1143
 
 
1144
 
            approval_required = False
1145
 
            try:
1146
 
                try:
1147
 
                    fpr = self.fingerprint(self.peer_certificate
1148
 
                                           (session))
1149
 
                except (TypeError, gnutls.errors.GNUTLSError), error:
1150
 
                    logger.warning(u"Bad certificate: %s", error)
1151
 
                    return
1152
 
                logger.debug(u"Fingerprint: %s", fpr)
1153
 
 
1154
 
                try:
1155
 
                    client = ProxyClient(child_pipe, fpr,
1156
 
                                         self.client_address)
1157
 
                except KeyError:
1158
 
                    return
1159
 
                
1160
 
                if client.approved_delay:
1161
 
                    delay = client.approved_delay
1162
 
                    client.approvals_pending += 1
1163
 
                    approval_required = True
1164
 
                
1165
 
                while True:
1166
 
                    if not client.enabled:
1167
 
                        logger.warning(u"Client %s is disabled",
1168
 
                                       client.name)
1169
 
                        if self.server.use_dbus:
1170
 
                            # Emit D-Bus signal
1171
 
                            client.Rejected("Disabled")                    
1172
 
                        return
1173
 
                    
1174
 
                    if client._approved or not client.approved_delay:
1175
 
                        #We are approved or approval is disabled
1176
 
                        break
1177
 
                    elif client._approved is None:
1178
 
                        logger.info(u"Client %s need approval",
1179
 
                                    client.name)
1180
 
                        if self.server.use_dbus:
1181
 
                            # Emit D-Bus signal
1182
 
                            client.NeedApproval(
1183
 
                                client.approved_delay_milliseconds(),
1184
 
                                client.approved_by_default)
1185
 
                    else:
1186
 
                        logger.warning(u"Client %s was not approved",
1187
 
                                       client.name)
1188
 
                        if self.server.use_dbus:
1189
 
                            # Emit D-Bus signal
1190
 
                            client.Rejected("Disapproved")
1191
 
                        return
1192
 
                    
1193
 
                    #wait until timeout or approved
1194
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1195
 
                    time = datetime.datetime.now()
1196
 
                    client.changedstate.acquire()
1197
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1198
 
                    client.changedstate.release()
1199
 
                    time2 = datetime.datetime.now()
1200
 
                    if (time2 - time) >= delay:
1201
 
                        if not client.approved_by_default:
1202
 
                            logger.warning("Client %s timed out while"
1203
 
                                           " waiting for approval",
1204
 
                                           client.name)
1205
 
                            if self.server.use_dbus:
1206
 
                                # Emit D-Bus signal
1207
 
                                client.Rejected("Time out")
1208
 
                            return
1209
 
                        else:
1210
 
                            break
1211
 
                    else:
1212
 
                        delay -= time2 - time
1213
 
                
1214
 
                sent_size = 0
1215
 
                while sent_size < len(client.secret):
1216
 
                    # XXX handle session exception
1217
 
                    sent = session.send(client.secret[sent_size:])
1218
 
                    logger.debug(u"Sent: %d, remaining: %d",
1219
 
                                 sent, len(client.secret)
1220
 
                                 - (sent_size + sent))
1221
 
                    sent_size += sent
1222
 
 
1223
 
                logger.info(u"Sending secret to %s", client.name)
1224
 
                # bump the timeout as if seen
1225
 
                client.checked_ok()
1226
 
                if self.server.use_dbus:
1227
 
                    # Emit D-Bus signal
1228
 
                    client.GotSecret()
1229
 
            
1230
 
            finally:
1231
 
                if approval_required:
1232
 
                    client.approvals_pending -= 1
1233
 
                session.bye()
1234
 
    
1235
 
    @staticmethod
1236
 
    def peer_certificate(session):
1237
 
        "Return the peer's OpenPGP certificate as a bytestring"
1238
 
        # If not an OpenPGP certificate...
1239
 
        if (gnutls.library.functions
1240
 
            .gnutls_certificate_type_get(session._c_object)
1241
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1242
 
            # ...do the normal thing
1243
 
            return session.peer_certificate
1244
 
        list_size = ctypes.c_uint(1)
1245
 
        cert_list = (gnutls.library.functions
1246
 
                     .gnutls_certificate_get_peers
1247
 
                     (session._c_object, ctypes.byref(list_size)))
1248
 
        if not bool(cert_list) and list_size.value != 0:
1249
 
            raise gnutls.errors.GNUTLSError(u"error getting peer"
1250
 
                                            u" certificate")
1251
 
        if list_size.value == 0:
1252
 
            return None
1253
 
        cert = cert_list[0]
1254
 
        return ctypes.string_at(cert.data, cert.size)
1255
 
    
1256
 
    @staticmethod
1257
 
    def fingerprint(openpgp):
1258
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1259
 
        # New GnuTLS "datum" with the OpenPGP public key
1260
 
        datum = (gnutls.library.types
1261
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1262
 
                                             ctypes.POINTER
1263
 
                                             (ctypes.c_ubyte)),
1264
 
                                 ctypes.c_uint(len(openpgp))))
1265
 
        # New empty GnuTLS certificate
1266
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1267
 
        (gnutls.library.functions
1268
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1269
 
        # Import the OpenPGP public key into the certificate
1270
 
        (gnutls.library.functions
1271
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1272
 
                                    gnutls.library.constants
1273
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1274
 
        # Verify the self signature in the key
1275
 
        crtverify = ctypes.c_uint()
1276
 
        (gnutls.library.functions
1277
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1278
 
                                         ctypes.byref(crtverify)))
1279
 
        if crtverify.value != 0:
1280
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1281
 
            raise (gnutls.errors.CertificateSecurityError
1282
 
                   (u"Verify failed"))
1283
 
        # New buffer for the fingerprint
1284
 
        buf = ctypes.create_string_buffer(20)
1285
 
        buf_len = ctypes.c_size_t()
1286
 
        # Get the fingerprint from the certificate into the buffer
1287
 
        (gnutls.library.functions
1288
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1289
 
                                             ctypes.byref(buf_len)))
1290
 
        # Deinit the certificate
1291
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1292
 
        # Convert the buffer to a Python bytestring
1293
 
        fpr = ctypes.string_at(buf, buf_len.value)
1294
 
        # Convert the bytestring to hexadecimal notation
1295
 
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1296
 
        return hex_fpr
1297
 
 
1298
 
 
1299
 
class MultiprocessingMixIn(object):
1300
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1301
 
    def sub_process_main(self, request, address):
1302
 
        try:
1303
 
            self.finish_request(request, address)
1304
 
        except:
1305
 
            self.handle_error(request, address)
1306
 
        self.close_request(request)
1307
 
            
1308
 
    def process_request(self, request, address):
1309
 
        """Start a new process to process the request."""
1310
 
        multiprocessing.Process(target = self.sub_process_main,
1311
 
                                args = (request, address)).start()
1312
 
 
1313
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1314
 
    """ adds a pipe to the MixIn """
1315
 
    def process_request(self, request, client_address):
1316
 
        """Overrides and wraps the original process_request().
1317
 
        
1318
 
        This function creates a new pipe in self.pipe
1319
 
        """
1320
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1321
 
 
1322
 
        super(MultiprocessingMixInWithPipe,
1323
 
              self).process_request(request, client_address)
1324
 
        self.add_pipe(parent_pipe)
1325
 
    def add_pipe(self, parent_pipe):
1326
 
        """Dummy function; override as necessary"""
1327
 
        pass
1328
 
 
1329
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1330
 
                     socketserver.TCPServer, object):
1331
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1332
 
    
 
310
        logger.debug(u"TCP connection from: %s",
 
311
                     unicode(self.client_address))
 
312
        session = gnutls.connection.ClientSession(self.request,
 
313
                                                  gnutls.connection.\
 
314
                                                  X509Credentials())
 
315
        
 
316
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
317
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
318
        #                "+DHE-DSS"))
 
319
        priority = "SECURE256"
 
320
        
 
321
        gnutls.library.functions.gnutls_priority_set_direct\
 
322
            (session._c_object, priority, None);
 
323
        
 
324
        try:
 
325
            session.handshake()
 
326
        except gnutls.errors.GNUTLSError, error:
 
327
            logger.debug(u"Handshake failed: %s", error)
 
328
            # Do not run session.bye() here: the session is not
 
329
            # established.  Just abandon the request.
 
330
            return
 
331
        try:
 
332
            fpr = fingerprint(peer_certificate(session))
 
333
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
334
            logger.debug(u"Bad certificate: %s", error)
 
335
            session.bye()
 
336
            return
 
337
        logger.debug(u"Fingerprint: %s", fpr)
 
338
        client = None
 
339
        for c in clients:
 
340
            if c.fingerprint == fpr:
 
341
                client = c
 
342
                break
 
343
        # Have to check if client.still_valid(), since it is possible
 
344
        # that the client timed out while establishing the GnuTLS
 
345
        # session.
 
346
        if (not client) or (not client.still_valid()):
 
347
            if client:
 
348
                logger.debug(u"Client %(name)s is invalid",
 
349
                             vars(client))
 
350
            else:
 
351
                logger.debug(u"Client not found for fingerprint: %s",
 
352
                             fpr)
 
353
            session.bye()
 
354
            return
 
355
        sent_size = 0
 
356
        while sent_size < len(client.secret):
 
357
            sent = session.send(client.secret[sent_size:])
 
358
            logger.debug(u"Sent: %d, remaining: %d",
 
359
                         sent, len(client.secret)
 
360
                         - (sent_size + sent))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1333
367
    Attributes:
1334
 
        enabled:        Boolean; whether this server is activated yet
1335
 
        interface:      None or a network interface name (string)
1336
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1337
370
    """
1338
 
    def __init__(self, server_address, RequestHandlerClass,
1339
 
                 interface=None, use_ipv6=True):
1340
 
        self.interface = interface
1341
 
        if use_ipv6:
1342
 
            self.address_family = socket.AF_INET6
1343
 
        socketserver.TCPServer.__init__(self, server_address,
1344
 
                                        RequestHandlerClass)
 
371
    address_family = socket.AF_INET6
 
372
    def __init__(self, *args, **kwargs):
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
 
376
        if "clients" in kwargs:
 
377
            self.clients = kwargs["clients"]
 
378
            del kwargs["clients"]
 
379
        return super(type(self), self).__init__(*args, **kwargs)
1345
380
    def server_bind(self):
1346
381
        """This overrides the normal server_bind() function
1347
382
        to bind to an interface if one was specified, and also NOT to
1348
383
        bind to an address or port if they were not specified."""
1349
 
        if self.interface is not None:
1350
 
            if SO_BINDTODEVICE is None:
1351
 
                logger.error(u"SO_BINDTODEVICE does not exist;"
1352
 
                             u" cannot bind to interface %s",
1353
 
                             self.interface)
1354
 
            else:
1355
 
                try:
1356
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1357
 
                                           SO_BINDTODEVICE,
1358
 
                                           str(self.interface
1359
 
                                               + u'\0'))
1360
 
                except socket.error, error:
1361
 
                    if error[0] == errno.EPERM:
1362
 
                        logger.error(u"No permission to"
1363
 
                                     u" bind to interface %s",
1364
 
                                     self.interface)
1365
 
                    elif error[0] == errno.ENOPROTOOPT:
1366
 
                        logger.error(u"SO_BINDTODEVICE not available;"
1367
 
                                     u" cannot bind to interface %s",
1368
 
                                     self.interface)
1369
 
                    else:
1370
 
                        raise
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
 
388
            try:
 
389
                self.socket.setsockopt(socket.SOL_SOCKET,
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
 
392
            except socket.error, error:
 
393
                if error[0] == errno.EPERM:
 
394
                    logger.warning(u"No permission to"
 
395
                                   u" bind to interface %s",
 
396
                                   self.options.interface)
 
397
                else:
 
398
                    raise error
1371
399
        # Only bind(2) the socket if we really need to.
1372
400
        if self.server_address[0] or self.server_address[1]:
1373
401
            if not self.server_address[0]:
1374
 
                if self.address_family == socket.AF_INET6:
1375
 
                    any_address = u"::" # in6addr_any
1376
 
                else:
1377
 
                    any_address = socket.INADDR_ANY
1378
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1379
404
                                       self.server_address[1])
1380
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1381
406
                self.server_address = (self.server_address[0],
1382
407
                                       0)
1383
 
#                 if self.interface:
1384
 
#                     self.server_address = (self.server_address[0],
1385
 
#                                            0, # port
1386
 
#                                            0, # flowinfo
1387
 
#                                            if_nametoindex
1388
 
#                                            (self.interface))
1389
 
            return socketserver.TCPServer.server_bind(self)
1390
 
 
1391
 
 
1392
 
class MandosServer(IPv6_TCPServer):
1393
 
    """Mandos server.
1394
 
    
1395
 
    Attributes:
1396
 
        clients:        set of Client objects
1397
 
        gnutls_priority GnuTLS priority string
1398
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1399
 
    
1400
 
    Assumes a gobject.MainLoop event loop.
1401
 
    """
1402
 
    def __init__(self, server_address, RequestHandlerClass,
1403
 
                 interface=None, use_ipv6=True, clients=None,
1404
 
                 gnutls_priority=None, use_dbus=True):
1405
 
        self.enabled = False
1406
 
        self.clients = clients
1407
 
        if self.clients is None:
1408
 
            self.clients = set()
1409
 
        self.use_dbus = use_dbus
1410
 
        self.gnutls_priority = gnutls_priority
1411
 
        IPv6_TCPServer.__init__(self, server_address,
1412
 
                                RequestHandlerClass,
1413
 
                                interface = interface,
1414
 
                                use_ipv6 = use_ipv6)
1415
 
    def server_activate(self):
1416
 
        if self.enabled:
1417
 
            return socketserver.TCPServer.server_activate(self)
1418
 
    def enable(self):
1419
 
        self.enabled = True
1420
 
    def add_pipe(self, parent_pipe):
1421
 
        # Call "handle_ipc" for both data and EOF events
1422
 
        gobject.io_add_watch(parent_pipe.fileno(),
1423
 
                             gobject.IO_IN | gobject.IO_HUP,
1424
 
                             functools.partial(self.handle_ipc,
1425
 
                                               parent_pipe = parent_pipe))
1426
 
        
1427
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1428
 
                   client_object=None):
1429
 
        condition_names = {
1430
 
            gobject.IO_IN: u"IN",   # There is data to read.
1431
 
            gobject.IO_OUT: u"OUT", # Data can be written (without
1432
 
                                    # blocking).
1433
 
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
1434
 
            gobject.IO_ERR: u"ERR", # Error condition.
1435
 
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
1436
 
                                    # broken, usually for pipes and
1437
 
                                    # sockets).
1438
 
            }
1439
 
        conditions_string = ' | '.join(name
1440
 
                                       for cond, name in
1441
 
                                       condition_names.iteritems()
1442
 
                                       if cond & condition)
1443
 
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
1444
 
                     conditions_string)
1445
 
        
1446
 
        # Read a request from the child
1447
 
        request = parent_pipe.recv()
1448
 
        command = request[0]
1449
 
        
1450
 
        if command == 'init':
1451
 
            fpr = request[1]
1452
 
            address = request[2]
1453
 
            
1454
 
            for c in self.clients:
1455
 
                if c.fingerprint == fpr:
1456
 
                    client = c
1457
 
                    break
1458
 
            else:
1459
 
                logger.warning(u"Client not found for fingerprint: %s, ad"
1460
 
                               u"dress: %s", fpr, address)
1461
 
                if self.use_dbus:
1462
 
                    # Emit D-Bus signal
1463
 
                    mandos_dbus_service.ClientNotFound(fpr, address)
1464
 
                parent_pipe.send(False)
1465
 
                return False
1466
 
            
1467
 
            gobject.io_add_watch(parent_pipe.fileno(),
1468
 
                                 gobject.IO_IN | gobject.IO_HUP,
1469
 
                                 functools.partial(self.handle_ipc,
1470
 
                                                   parent_pipe = parent_pipe,
1471
 
                                                   client_object = client))
1472
 
            parent_pipe.send(True)
1473
 
            # remove the old hook in favor of the new above hook on same fileno
1474
 
            return False
1475
 
        if command == 'funcall':
1476
 
            funcname = request[1]
1477
 
            args = request[2]
1478
 
            kwargs = request[3]
1479
 
            
1480
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1481
 
 
1482
 
        if command == 'getattr':
1483
 
            attrname = request[1]
1484
 
            if callable(client_object.__getattribute__(attrname)):
1485
 
                parent_pipe.send(('function',))
1486
 
            else:
1487
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1488
 
 
1489
 
        if command == 'setattr':
1490
 
            attrname = request[1]
1491
 
            value = request[2]
1492
 
            setattr(client_object, attrname, value)
1493
 
            
1494
 
        return True
 
408
            return super(type(self), self).server_bind()
1495
409
 
1496
410
 
1497
411
def string_to_delta(interval):
1498
412
    """Parse a string and return a datetime.timedelta
1499
 
    
1500
 
    >>> string_to_delta(u'7d')
 
413
 
 
414
    >>> string_to_delta('7d')
1501
415
    datetime.timedelta(7)
1502
 
    >>> string_to_delta(u'60s')
 
416
    >>> string_to_delta('60s')
1503
417
    datetime.timedelta(0, 60)
1504
 
    >>> string_to_delta(u'60m')
 
418
    >>> string_to_delta('60m')
1505
419
    datetime.timedelta(0, 3600)
1506
 
    >>> string_to_delta(u'24h')
 
420
    >>> string_to_delta('24h')
1507
421
    datetime.timedelta(1)
1508
422
    >>> string_to_delta(u'1w')
1509
423
    datetime.timedelta(7)
1510
 
    >>> string_to_delta(u'5m 30s')
1511
 
    datetime.timedelta(0, 330)
1512
424
    """
1513
 
    timevalue = datetime.timedelta(0)
1514
 
    for s in interval.split():
1515
 
        try:
1516
 
            suffix = unicode(s[-1])
1517
 
            value = int(s[:-1])
1518
 
            if suffix == u"d":
1519
 
                delta = datetime.timedelta(value)
1520
 
            elif suffix == u"s":
1521
 
                delta = datetime.timedelta(0, value)
1522
 
            elif suffix == u"m":
1523
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1524
 
            elif suffix == u"h":
1525
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1526
 
            elif suffix == u"w":
1527
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1528
 
            else:
1529
 
                raise ValueError(u"Unknown suffix %r" % suffix)
1530
 
        except (ValueError, IndexError), e:
1531
 
            raise ValueError(e.message)
1532
 
        timevalue += delta
1533
 
    return timevalue
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
 
439
            raise ValueError
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
457
                 serviceName, serviceType)
 
458
    
 
459
    group.AddService(
 
460
            serviceInterface,           # interface
 
461
            avahi.PROTO_INET6,          # protocol
 
462
            dbus.UInt32(0),             # flags
 
463
            serviceName, serviceType,
 
464
            domain, host,
 
465
            dbus.UInt16(servicePort),
 
466
            avahi.string_array_to_txt_array(serviceTXT))
 
467
    group.Commit()
 
468
 
 
469
 
 
470
def remove_service():
 
471
    """From the Avahi server example code"""
 
472
    global group
 
473
    
 
474
    if not group is None:
 
475
        group.Reset()
 
476
 
 
477
 
 
478
def server_state_changed(state):
 
479
    """From the Avahi server example code"""
 
480
    if state == avahi.SERVER_COLLISION:
 
481
        logger.warning(u"Server name collision")
 
482
        remove_service()
 
483
    elif state == avahi.SERVER_RUNNING:
 
484
        add_service()
 
485
 
 
486
 
 
487
def entry_group_state_changed(state, error):
 
488
    """From the Avahi server example code"""
 
489
    global serviceName, server, rename_count
 
490
    
 
491
    logger.debug(u"state change: %i", state)
 
492
    
 
493
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
494
        logger.debug(u"Service established.")
 
495
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
496
        
 
497
        rename_count = rename_count - 1
 
498
        if rename_count > 0:
 
499
            name = server.GetAlternativeServiceName(name)
 
500
            logger.warning(u"Service name collision, "
 
501
                           u"changing name to '%s' ...", name)
 
502
            remove_service()
 
503
            add_service()
 
504
            
 
505
        else:
 
506
            logger.error(u"No suitable service name found "
 
507
                         u"after %i retries, exiting.",
 
508
                         n_rename)
 
509
            main_loop.quit()
 
510
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
511
        logger.error(u"Error in group state changed %s",
 
512
                     unicode(error))
 
513
        main_loop.quit()
 
514
        return
1534
515
 
1535
516
 
1536
517
def if_nametoindex(interface):
1537
 
    """Call the C function if_nametoindex(), or equivalent
1538
 
    
1539
 
    Note: This function cannot accept a unicode string."""
1540
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1541
519
    try:
1542
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1543
 
                          (ctypes.util.find_library(u"c"))
1544
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1545
522
    except (OSError, AttributeError):
1546
 
        logger.warning(u"Doing if_nametoindex the hard way")
1547
 
        def if_nametoindex(interface):
1548
 
            "Get an interface index the hard way, i.e. using fcntl()"
1549
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1550
 
            with contextlib.closing(socket.socket()) as s:
1551
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1552
 
                                    struct.pack(str(u"16s16x"),
1553
 
                                                interface))
1554
 
            interface_index = struct.unpack(str(u"I"),
1555
 
                                            ifreq[16:20])[0]
1556
 
            return interface_index
1557
 
    return if_nametoindex(interface)
1558
 
 
1559
 
 
1560
 
def daemon(nochdir = False, noclose = False):
1561
 
    """See daemon(3).  Standard BSD Unix function.
1562
 
    
1563
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1564
 
    if os.fork():
1565
 
        sys.exit()
1566
 
    os.setsid()
1567
 
    if not nochdir:
1568
 
        os.chdir(u"/")
1569
 
    if os.fork():
1570
 
        sys.exit()
1571
 
    if not noclose:
1572
 
        # Close all standard open file descriptors
1573
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1574
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1575
 
            raise OSError(errno.ENODEV,
1576
 
                          u"%s not a character device"
1577
 
                          % os.path.devnull)
1578
 
        os.dup2(null, sys.stdin.fileno())
1579
 
        os.dup2(null, sys.stdout.fileno())
1580
 
        os.dup2(null, sys.stderr.fileno())
1581
 
        if null > 2:
1582
 
            os.close(null)
1583
 
 
1584
 
 
1585
 
def main():
1586
 
    
1587
 
    ##################################################################
1588
 
    # Parsing of options, both command line and config file
1589
 
    
1590
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
1591
 
    parser.add_option("-i", u"--interface", type=u"string",
1592
 
                      metavar="IF", help=u"Bind to interface IF")
1593
 
    parser.add_option("-a", u"--address", type=u"string",
1594
 
                      help=u"Address to listen for requests on")
1595
 
    parser.add_option("-p", u"--port", type=u"int",
1596
 
                      help=u"Port number to receive requests on")
1597
 
    parser.add_option("--check", action=u"store_true",
1598
 
                      help=u"Run self-test")
1599
 
    parser.add_option("--debug", action=u"store_true",
1600
 
                      help=u"Debug mode; run in foreground and log to"
1601
 
                      u" terminal")
1602
 
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1603
 
                      u" priority string (see GnuTLS documentation)")
1604
 
    parser.add_option("--servicename", type=u"string",
1605
 
                      metavar=u"NAME", help=u"Zeroconf service name")
1606
 
    parser.add_option("--configdir", type=u"string",
1607
 
                      default=u"/etc/mandos", metavar=u"DIR",
1608
 
                      help=u"Directory to search for configuration"
1609
 
                      u" files")
1610
 
    parser.add_option("--no-dbus", action=u"store_false",
1611
 
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
1612
 
                      u" system bus interface")
1613
 
    parser.add_option("--no-ipv6", action=u"store_false",
1614
 
                      dest=u"use_ipv6", help=u"Do not use IPv6")
1615
 
    options = parser.parse_args()[0]
 
523
        if "struct" not in sys.modules:
 
524
            import struct
 
525
        if "fcntl" not in sys.modules:
 
526
            import fcntl
 
527
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
528
        s = socket.socket()
 
529
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
530
                            struct.pack("16s16x", interface))
 
531
        s.close()
 
532
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
533
        return interface_index
 
534
 
 
535
 
 
536
if __name__ == '__main__':
 
537
    parser = OptionParser()
 
538
    parser.add_option("-i", "--interface", type="string",
 
539
                      default=None, metavar="IF",
 
540
                      help="Bind to interface IF")
 
541
    parser.add_option("--cert", type="string", default="cert.pem",
 
542
                      metavar="FILE",
 
543
                      help="Public key certificate PEM file to use")
 
544
    parser.add_option("--key", type="string", default="key.pem",
 
545
                      metavar="FILE",
 
546
                      help="Private key PEM file to use")
 
547
    parser.add_option("--ca", type="string", default="ca.pem",
 
548
                      metavar="FILE",
 
549
                      help="Certificate Authority certificate PEM file to use")
 
550
    parser.add_option("--crl", type="string", default="crl.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Revokation List PEM file to use")
 
553
    parser.add_option("-p", "--port", type="int", default=None,
 
554
                      help="Port number to receive requests on")
 
555
    parser.add_option("--timeout", type="string", # Parsed later
 
556
                      default="1h",
 
557
                      help="Amount of downtime allowed for clients")
 
558
    parser.add_option("--interval", type="string", # Parsed later
 
559
                      default="5m",
 
560
                      help="How often to check that a client is up")
 
561
    parser.add_option("--check", action="store_true", default=False,
 
562
                      help="Run self-test")
 
563
    parser.add_option("--debug", action="store_true", default=False,
 
564
                      help="Debug mode")
 
565
    (options, args) = parser.parse_args()
1616
566
    
1617
567
    if options.check:
1618
568
        import doctest
1619
569
        doctest.testmod()
1620
570
        sys.exit()
1621
571
    
1622
 
    # Default values for config file for server-global settings
1623
 
    server_defaults = { u"interface": u"",
1624
 
                        u"address": u"",
1625
 
                        u"port": u"",
1626
 
                        u"debug": u"False",
1627
 
                        u"priority":
1628
 
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1629
 
                        u"servicename": u"Mandos",
1630
 
                        u"use_dbus": u"True",
1631
 
                        u"use_ipv6": u"True",
1632
 
                        }
1633
 
    
1634
 
    # Parse config file for server-global settings
1635
 
    server_config = configparser.SafeConfigParser(server_defaults)
1636
 
    del server_defaults
1637
 
    server_config.read(os.path.join(options.configdir,
1638
 
                                    u"mandos.conf"))
1639
 
    # Convert the SafeConfigParser object to a dict
1640
 
    server_settings = server_config.defaults()
1641
 
    # Use the appropriate methods on the non-string config options
1642
 
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
1643
 
        server_settings[option] = server_config.getboolean(u"DEFAULT",
1644
 
                                                           option)
1645
 
    if server_settings["port"]:
1646
 
        server_settings["port"] = server_config.getint(u"DEFAULT",
1647
 
                                                       u"port")
1648
 
    del server_config
1649
 
    
1650
 
    # Override the settings from the config file with command line
1651
 
    # options, if set.
1652
 
    for option in (u"interface", u"address", u"port", u"debug",
1653
 
                   u"priority", u"servicename", u"configdir",
1654
 
                   u"use_dbus", u"use_ipv6"):
1655
 
        value = getattr(options, option)
1656
 
        if value is not None:
1657
 
            server_settings[option] = value
1658
 
    del options
1659
 
    # Force all strings to be unicode
1660
 
    for option in server_settings.keys():
1661
 
        if type(server_settings[option]) is str:
1662
 
            server_settings[option] = unicode(server_settings[option])
1663
 
    # Now we have our good server settings in "server_settings"
1664
 
    
1665
 
    ##################################################################
1666
 
    
1667
 
    # For convenience
1668
 
    debug = server_settings[u"debug"]
1669
 
    use_dbus = server_settings[u"use_dbus"]
1670
 
    use_ipv6 = server_settings[u"use_ipv6"]
1671
 
    
1672
 
    if not debug:
1673
 
        syslogger.setLevel(logging.WARNING)
1674
 
        console.setLevel(logging.WARNING)
1675
 
    
1676
 
    if server_settings[u"servicename"] != u"Mandos":
1677
 
        syslogger.setFormatter(logging.Formatter
1678
 
                               (u'Mandos (%s) [%%(process)d]:'
1679
 
                                u' %%(levelname)s: %%(message)s'
1680
 
                                % server_settings[u"servicename"]))
1681
 
    
1682
 
    # Parse config file with clients
1683
 
    client_defaults = { u"timeout": u"1h",
1684
 
                        u"interval": u"5m",
1685
 
                        u"checker": u"fping -q -- %%(host)s",
1686
 
                        u"host": u"",
1687
 
                        u"approved_delay": u"5m",
1688
 
                        u"approved_duration": u"1s",
1689
 
                        }
1690
 
    client_config = configparser.SafeConfigParser(client_defaults)
1691
 
    client_config.read(os.path.join(server_settings[u"configdir"],
1692
 
                                    u"clients.conf"))
1693
 
    
1694
 
    global mandos_dbus_service
1695
 
    mandos_dbus_service = None
1696
 
    
1697
 
    tcp_server = MandosServer((server_settings[u"address"],
1698
 
                               server_settings[u"port"]),
1699
 
                              ClientHandler,
1700
 
                              interface=server_settings[u"interface"],
1701
 
                              use_ipv6=use_ipv6,
1702
 
                              gnutls_priority=
1703
 
                              server_settings[u"priority"],
1704
 
                              use_dbus=use_dbus)
1705
 
    pidfilename = u"/var/run/mandos.pid"
1706
 
    try:
1707
 
        pidfile = open(pidfilename, u"w")
1708
 
    except IOError:
1709
 
        logger.error(u"Could not open file %r", pidfilename)
1710
 
    
1711
 
    try:
1712
 
        uid = pwd.getpwnam(u"_mandos").pw_uid
1713
 
        gid = pwd.getpwnam(u"_mandos").pw_gid
1714
 
    except KeyError:
1715
 
        try:
1716
 
            uid = pwd.getpwnam(u"mandos").pw_uid
1717
 
            gid = pwd.getpwnam(u"mandos").pw_gid
1718
 
        except KeyError:
1719
 
            try:
1720
 
                uid = pwd.getpwnam(u"nobody").pw_uid
1721
 
                gid = pwd.getpwnam(u"nobody").pw_gid
1722
 
            except KeyError:
1723
 
                uid = 65534
1724
 
                gid = 65534
1725
 
    try:
1726
 
        os.setgid(gid)
1727
 
        os.setuid(uid)
1728
 
    except OSError, error:
1729
 
        if error[0] != errno.EPERM:
1730
 
            raise error
1731
 
    
1732
 
    # Enable all possible GnuTLS debugging
1733
 
    if debug:
1734
 
        # "Use a log level over 10 to enable all debugging options."
1735
 
        # - GnuTLS manual
1736
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1737
 
        
1738
 
        @gnutls.library.types.gnutls_log_func
1739
 
        def debug_gnutls(level, string):
1740
 
            logger.debug(u"GnuTLS: %s", string[:-1])
1741
 
        
1742
 
        (gnutls.library.functions
1743
 
         .gnutls_global_set_log_function(debug_gnutls))
1744
 
    
1745
 
    global main_loop
1746
 
    # From the Avahi example code
 
572
    # Parse the time arguments
 
573
    try:
 
574
        options.timeout = string_to_delta(options.timeout)
 
575
    except ValueError:
 
576
        parser.error("option --timeout: Unparseable time")
 
577
    try:
 
578
        options.interval = string_to_delta(options.interval)
 
579
    except ValueError:
 
580
        parser.error("option --interval: Unparseable time")
 
581
    
 
582
    # Parse config file
 
583
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
584
    client_config = ConfigParser.SafeConfigParser(defaults)
 
585
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
586
    client_config.read("mandos-clients.conf")
 
587
    
 
588
    # From the Avahi server example code
1747
589
    DBusGMainLoop(set_as_default=True )
1748
590
    main_loop = gobject.MainLoop()
1749
591
    bus = dbus.SystemBus()
1750
 
    # End of Avahi example code
1751
 
    if use_dbus:
1752
 
        try:
1753
 
            bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
1754
 
                                            bus, do_not_queue=True)
1755
 
        except dbus.exceptions.NameExistsException, e:
1756
 
            logger.error(unicode(e) + u", disabling D-Bus")
1757
 
            use_dbus = False
1758
 
            server_settings[u"use_dbus"] = False
1759
 
            tcp_server.use_dbus = False
1760
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1761
 
    service = AvahiService(name = server_settings[u"servicename"],
1762
 
                           servicetype = u"_mandos._tcp",
1763
 
                           protocol = protocol, bus = bus)
1764
 
    if server_settings["interface"]:
1765
 
        service.interface = (if_nametoindex
1766
 
                             (str(server_settings[u"interface"])))
1767
 
    
1768
 
    client_class = Client
1769
 
    if use_dbus:
1770
 
        client_class = functools.partial(ClientDBus, bus = bus)
1771
 
    def client_config_items(config, section):
1772
 
        special_settings = {
1773
 
            "approved_by_default":
1774
 
                lambda: config.getboolean(section,
1775
 
                                          "approved_by_default"),
1776
 
            }
1777
 
        for name, value in config.items(section):
1778
 
            try:
1779
 
                yield (name, special_settings[name]())
1780
 
            except KeyError:
1781
 
                yield (name, value)
1782
 
    
1783
 
    tcp_server.clients.update(set(
1784
 
            client_class(name = section,
1785
 
                         config= dict(client_config_items(
1786
 
                        client_config, section)))
1787
 
            for section in client_config.sections()))
1788
 
    if not tcp_server.clients:
1789
 
        logger.warning(u"No clients defined")
1790
 
    
1791
 
    if debug:
1792
 
        # Redirect stdin so all checkers get /dev/null
1793
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1794
 
        os.dup2(null, sys.stdin.fileno())
1795
 
        if null > 2:
1796
 
            os.close(null)
1797
 
    else:
1798
 
        # No console logging
1799
 
        logger.removeHandler(console)
1800
 
        # Close all input and output, do double fork, etc.
1801
 
        daemon()
1802
 
    
1803
 
    try:
1804
 
        with pidfile:
1805
 
            pid = os.getpid()
1806
 
            pidfile.write(str(pid) + "\n")
1807
 
        del pidfile
1808
 
    except IOError:
1809
 
        logger.error(u"Could not write to file %r with PID %d",
1810
 
                     pidfilename, pid)
1811
 
    except NameError:
1812
 
        # "pidfile" was never created
1813
 
        pass
1814
 
    del pidfilename
1815
 
    
1816
 
    if not debug:
1817
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1818
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1819
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1820
 
    
1821
 
    if use_dbus:
1822
 
        class MandosDBusService(dbus.service.Object):
1823
 
            """A D-Bus proxy object"""
1824
 
            def __init__(self):
1825
 
                dbus.service.Object.__init__(self, bus, u"/")
1826
 
            _interface = u"se.bsnet.fukt.Mandos"
1827
 
            
1828
 
            @dbus.service.signal(_interface, signature=u"o")
1829
 
            def ClientAdded(self, objpath):
1830
 
                "D-Bus signal"
1831
 
                pass
1832
 
            
1833
 
            @dbus.service.signal(_interface, signature=u"ss")
1834
 
            def ClientNotFound(self, fingerprint, address):
1835
 
                "D-Bus signal"
1836
 
                pass
1837
 
            
1838
 
            @dbus.service.signal(_interface, signature=u"os")
1839
 
            def ClientRemoved(self, objpath, name):
1840
 
                "D-Bus signal"
1841
 
                pass
1842
 
            
1843
 
            @dbus.service.method(_interface, out_signature=u"ao")
1844
 
            def GetAllClients(self):
1845
 
                "D-Bus method"
1846
 
                return dbus.Array(c.dbus_object_path
1847
 
                                  for c in tcp_server.clients)
1848
 
            
1849
 
            @dbus.service.method(_interface,
1850
 
                                 out_signature=u"a{oa{sv}}")
1851
 
            def GetAllClientsWithProperties(self):
1852
 
                "D-Bus method"
1853
 
                return dbus.Dictionary(
1854
 
                    ((c.dbus_object_path, c.GetAll(u""))
1855
 
                     for c in tcp_server.clients),
1856
 
                    signature=u"oa{sv}")
1857
 
            
1858
 
            @dbus.service.method(_interface, in_signature=u"o")
1859
 
            def RemoveClient(self, object_path):
1860
 
                "D-Bus method"
1861
 
                for c in tcp_server.clients:
1862
 
                    if c.dbus_object_path == object_path:
1863
 
                        tcp_server.clients.remove(c)
1864
 
                        c.remove_from_connection()
1865
 
                        # Don't signal anything except ClientRemoved
1866
 
                        c.disable(quiet=True)
1867
 
                        # Emit D-Bus signal
1868
 
                        self.ClientRemoved(object_path, c.name)
1869
 
                        return
1870
 
                raise KeyError(object_path)
1871
 
            
1872
 
            del _interface
1873
 
        
1874
 
        mandos_dbus_service = MandosDBusService()
1875
 
    
1876
 
    def cleanup():
1877
 
        "Cleanup function; run on exit"
1878
 
        service.cleanup()
1879
 
        
1880
 
        while tcp_server.clients:
1881
 
            client = tcp_server.clients.pop()
1882
 
            if use_dbus:
1883
 
                client.remove_from_connection()
1884
 
            client.disable_hook = None
1885
 
            # Don't signal anything except ClientRemoved
1886
 
            client.disable(quiet=True)
1887
 
            if use_dbus:
1888
 
                # Emit D-Bus signal
1889
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1890
 
                                                  client.name)
1891
 
    
1892
 
    atexit.register(cleanup)
1893
 
    
1894
 
    for client in tcp_server.clients:
1895
 
        if use_dbus:
1896
 
            # Emit D-Bus signal
1897
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
1898
 
        client.enable()
1899
 
    
1900
 
    tcp_server.enable()
1901
 
    tcp_server.server_activate()
1902
 
    
1903
 
    # Find out what port we got
1904
 
    service.port = tcp_server.socket.getsockname()[1]
1905
 
    if use_ipv6:
1906
 
        logger.info(u"Now listening on address %r, port %d,"
1907
 
                    " flowinfo %d, scope_id %d"
1908
 
                    % tcp_server.socket.getsockname())
1909
 
    else:                       # IPv4
1910
 
        logger.info(u"Now listening on address %r, port %d"
1911
 
                    % tcp_server.socket.getsockname())
1912
 
    
1913
 
    #service.interface = tcp_server.socket.getsockname()[3]
1914
 
    
1915
 
    try:
1916
 
        # From the Avahi example code
1917
 
        try:
1918
 
            service.activate()
1919
 
        except dbus.exceptions.DBusException, error:
1920
 
            logger.critical(u"DBusException: %s", error)
1921
 
            cleanup()
1922
 
            sys.exit(1)
1923
 
        # End of Avahi example code
1924
 
        
1925
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1926
 
                             lambda *args, **kwargs:
1927
 
                             (tcp_server.handle_request
1928
 
                              (*args[2:], **kwargs) or True))
1929
 
        
1930
 
        logger.debug(u"Starting main loop")
 
592
    server = dbus.Interface(
 
593
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
594
            avahi.DBUS_INTERFACE_SERVER )
 
595
    # End of Avahi example code
 
596
    
 
597
    debug = options.debug
 
598
    
 
599
    clients = Set()
 
600
    def remove_from_clients(client):
 
601
        clients.remove(client)
 
602
        if not clients:
 
603
            logger.debug(u"No clients left, exiting")
 
604
            main_loop.quit()
 
605
    
 
606
    clients.update(Set(Client(name=section, options=options,
 
607
                              stop_hook = remove_from_clients,
 
608
                              **(dict(client_config\
 
609
                                      .items(section))))
 
610
                       for section in client_config.sections()))
 
611
    for client in clients:
 
612
        client.start()
 
613
    
 
614
    tcp_server = IPv6_TCPServer((None, options.port),
 
615
                                tcp_handler,
 
616
                                options=options,
 
617
                                clients=clients)
 
618
    # Find out what random port we got
 
619
    servicePort = tcp_server.socket.getsockname()[1]
 
620
    logger.debug(u"Now listening on port %d", servicePort)
 
621
    
 
622
    if options.interface is not None:
 
623
        serviceInterface = if_nametoindex(options.interface)
 
624
    
 
625
    # From the Avahi server example code
 
626
    server.connect_to_signal("StateChanged", server_state_changed)
 
627
    server_state_changed(server.GetState())
 
628
    # End of Avahi example code
 
629
    
 
630
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
631
                         lambda *args, **kwargs:
 
632
                         tcp_server.handle_request(*args[2:],
 
633
                                                   **kwargs) or True)
 
634
    try:
1931
635
        main_loop.run()
1932
 
    except AvahiError, error:
1933
 
        logger.critical(u"AvahiError: %s", error)
1934
 
        cleanup()
1935
 
        sys.exit(1)
1936
636
    except KeyboardInterrupt:
1937
 
        if debug:
1938
 
            print >> sys.stderr
1939
 
        logger.debug(u"Server received KeyboardInterrupt")
1940
 
    logger.debug(u"Server exiting")
1941
 
    # Must run before the D-Bus bus name gets deregistered
1942
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
1943
640
 
1944
 
if __name__ == '__main__':
1945
 
    main()
 
641
    # From the Avahi server example code
 
642
    if not group is None:
 
643
        group.Free()
 
644
    # End of Avahi example code
 
645
    
 
646
    for client in clients:
 
647
        client.stop_hook = None
 
648
        client.stop()