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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 © 2008-2011 Teddy Hogeborn
15
 
# Copyright © 2008-2011 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, absolute_import, print_function,
35
 
                        unicode_literals)
36
 
 
37
 
import SocketServer as socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
38
6
import socket
39
 
import argparse
 
7
import select
 
8
from optparse import OptionParser
40
9
import datetime
41
10
import errno
42
11
import gnutls.crypto
45
14
import gnutls.library.functions
46
15
import gnutls.library.constants
47
16
import gnutls.library.types
48
 
import ConfigParser as configparser
 
17
import ConfigParser
49
18
import sys
50
19
import re
51
20
import os
52
21
import signal
 
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
import contextlib
60
 
import struct
61
 
import fcntl
62
 
import functools
63
 
import cPickle as pickle
64
 
import multiprocessing
65
24
 
66
25
import dbus
67
 
import dbus.service
68
26
import gobject
69
27
import avahi
70
28
from dbus.mainloop.glib import DBusGMainLoop
71
29
import ctypes
72
 
import ctypes.util
73
 
import xml.dom.minidom
74
 
import inspect
75
 
 
76
 
try:
77
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
78
 
except AttributeError:
79
 
    try:
80
 
        from IN import SO_BINDTODEVICE
81
 
    except ImportError:
82
 
        SO_BINDTODEVICE = None
83
 
 
84
 
 
85
 
version = "1.3.0"
86
 
 
87
 
#logger = logging.getLogger('mandos')
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
88
36
logger = logging.Logger('mandos')
89
 
syslogger = (logging.handlers.SysLogHandler
90
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
91
 
              address = str("/dev/log")))
92
 
syslogger.setFormatter(logging.Formatter
93
 
                       ('Mandos [%(process)d]: %(levelname)s:'
94
 
                        ' %(message)s'))
95
 
logger.addHandler(syslogger)
96
 
 
97
 
console = logging.StreamHandler()
98
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
99
 
                                       ' %(levelname)s:'
100
 
                                       ' %(message)s'))
101
 
logger.addHandler(console)
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: 'Mandos'
124
 
    type: string; Example: '_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 = "", host = "", 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
 
        self.entry_group_state_changed_match = None
155
 
    def rename(self):
156
 
        """Derived from the Avahi example code"""
157
 
        if self.rename_count >= self.max_renames:
158
 
            logger.critical("No suitable Zeroconf service name found"
159
 
                            " after %i retries, exiting.",
160
 
                            self.rename_count)
161
 
            raise AvahiServiceError("Too many renames")
162
 
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
163
 
        logger.info("Changing Zeroconf service name to %r ...",
164
 
                    self.name)
165
 
        syslogger.setFormatter(logging.Formatter
166
 
                               ('Mandos (%s) [%%(process)d]:'
167
 
                                ' %%(levelname)s: %%(message)s'
168
 
                                % self.name))
169
 
        self.remove()
170
 
        try:
171
 
            self.add()
172
 
        except dbus.exceptions.DBusException as error:
173
 
            logger.critical("DBusException: %s", error)
174
 
            self.cleanup()
175
 
            os._exit(1)
176
 
        self.rename_count += 1
177
 
    def remove(self):
178
 
        """Derived from the Avahi example code"""
179
 
        if self.entry_group_state_changed_match is not None:
180
 
            self.entry_group_state_changed_match.remove()
181
 
            self.entry_group_state_changed_match = None
182
 
        if self.group is not None:
183
 
            self.group.Reset()
184
 
    def add(self):
185
 
        """Derived from the Avahi example code"""
186
 
        self.remove()
187
 
        if self.group is None:
188
 
            self.group = dbus.Interface(
189
 
                self.bus.get_object(avahi.DBUS_NAME,
190
 
                                    self.server.EntryGroupNew()),
191
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
192
 
        self.entry_group_state_changed_match = (
193
 
            self.group.connect_to_signal(
194
 
                'StateChanged', self .entry_group_state_changed))
195
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
196
 
                     self.name, self.type)
197
 
        self.group.AddService(
198
 
            self.interface,
199
 
            self.protocol,
200
 
            dbus.UInt32(0),     # flags
201
 
            self.name, self.type,
202
 
            self.domain, self.host,
203
 
            dbus.UInt16(self.port),
204
 
            avahi.string_array_to_txt_array(self.TXT))
205
 
        self.group.Commit()
206
 
    def entry_group_state_changed(self, state, error):
207
 
        """Derived from the Avahi example code"""
208
 
        logger.debug("Avahi entry group state change: %i", state)
209
 
        
210
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
211
 
            logger.debug("Zeroconf service established.")
212
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
213
 
            logger.info("Zeroconf service name collision.")
214
 
            self.rename()
215
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
216
 
            logger.critical("Avahi: Error in group state changed %s",
217
 
                            unicode(error))
218
 
            raise AvahiGroupError("State changed: %s"
219
 
                                  % unicode(error))
220
 
    def cleanup(self):
221
 
        """Derived from the Avahi example code"""
222
 
        if self.group is not None:
223
 
            try:
224
 
                self.group.Free()
225
 
            except (dbus.exceptions.UnknownMethodException,
226
 
                    dbus.exceptions.DBusException) as e:
227
 
                pass
228
 
            self.group = None
229
 
        self.remove()
230
 
    def server_state_changed(self, state, error=None):
231
 
        """Derived from the Avahi example code"""
232
 
        logger.debug("Avahi server state change: %i", state)
233
 
        bad_states = { avahi.SERVER_INVALID:
234
 
                           "Zeroconf server invalid",
235
 
                       avahi.SERVER_REGISTERING: None,
236
 
                       avahi.SERVER_COLLISION:
237
 
                           "Zeroconf server name collision",
238
 
                       avahi.SERVER_FAILURE:
239
 
                           "Zeroconf server failure" }
240
 
        if state in bad_states:
241
 
            if bad_states[state] is not None:
242
 
                if error is None:
243
 
                    logger.error(bad_states[state])
244
 
                else:
245
 
                    logger.error(bad_states[state] + ": %r", error)
246
 
            self.cleanup()
247
 
        elif state == avahi.SERVER_RUNNING:
248
 
            self.add()
249
 
        else:
250
 
            if error is None:
251
 
                logger.debug("Unknown state: %r", state)
252
 
            else:
253
 
                logger.debug("Unknown state: %r: %r", state, error)
254
 
    def activate(self):
255
 
        """Derived from the Avahi example code"""
256
 
        if self.server is None:
257
 
            self.server = dbus.Interface(
258
 
                self.bus.get_object(avahi.DBUS_NAME,
259
 
                                    avahi.DBUS_PATH_SERVER,
260
 
                                    follow_name_owner_changes=True),
261
 
                avahi.DBUS_INTERFACE_SERVER)
262
 
        self.server.connect_to_signal("StateChanged",
263
 
                                 self.server_state_changed)
264
 
        self.server_state_changed(self.server.GetState())
 
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
265
54
 
266
55
 
267
56
class Client(object):
268
57
    """A representation of a client host served by this server.
269
 
    
270
58
    Attributes:
271
 
    _approved:   bool(); 'None' if not yet approved/disapproved
272
 
    approval_delay: datetime.timedelta(); Time to wait for approval
273
 
    approval_duration: datetime.timedelta(); Duration of one approval
274
 
    checker:    subprocess.Popen(); a running checker process used
275
 
                                    to see if the client lives.
276
 
                                    'None' if no process is running.
277
 
    checker_callback_tag: a gobject event source tag, or None
278
 
    checker_command: string; External command which is run to check
279
 
                     if client lives.  %() expansions are done at
 
59
    name:      string; from the config file, used in log messages
 
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
61
                 uniquely identify the client
 
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.
 
73
    checker_initiator_tag: a gobject event source tag, or None
 
74
    stop_initiator_tag:    - '' -
 
75
    checker_callback_tag:  - '' -
 
76
    checker_command: string; External command which is run to check if
 
77
                     client lives.  %()s expansions are done at
280
78
                     runtime with vars(self) as dict, so that for
281
79
                     instance %(name)s can be used in the command.
282
 
    checker_initiator_tag: a gobject event source tag, or None
283
 
    created:    datetime.datetime(); (UTC) object creation
284
 
    current_checker_command: string; current running checker_command
285
 
    disable_hook:  If set, called by disable() as disable_hook(self)
286
 
    disable_initiator_tag: a gobject event source tag, or None
287
 
    enabled:    bool()
288
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
289
 
                 uniquely identify the client
290
 
    host:       string; available for use by the checker command
291
 
    interval:   datetime.timedelta(); How often to start a new checker
292
 
    last_approval_request: datetime.datetime(); (UTC) or None
293
 
    last_checked_ok: datetime.datetime(); (UTC) or None
294
 
    last_enabled: datetime.datetime(); (UTC)
295
 
    name:       string; from the config file, used in log messages and
296
 
                        D-Bus identifiers
297
 
    secret:     bytestring; sent verbatim (over TLS) to client
298
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
299
 
                                      until this client is disabled
300
 
    runtime_expansions: Allowed attributes for runtime expansion.
 
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: - '' -
301
85
    """
302
 
    
303
 
    runtime_expansions = ("approval_delay", "approval_duration",
304
 
                          "created", "enabled", "fingerprint",
305
 
                          "host", "interval", "last_checked_ok",
306
 
                          "last_enabled", "name", "timeout")
307
 
    
308
 
    @staticmethod
309
 
    def _timedelta_to_milliseconds(td):
310
 
        "Convert a datetime.timedelta() to milliseconds"
311
 
        return ((td.days * 24 * 60 * 60 * 1000)
312
 
                + (td.seconds * 1000)
313
 
                + (td.microseconds // 1000))
314
 
    
315
 
    def timeout_milliseconds(self):
316
 
        "Return the 'timeout' attribute in milliseconds"
317
 
        return self._timedelta_to_milliseconds(self.timeout)
318
 
    
319
 
    def interval_milliseconds(self):
320
 
        "Return the 'interval' attribute in milliseconds"
321
 
        return self._timedelta_to_milliseconds(self.interval)
322
 
 
323
 
    def approval_delay_milliseconds(self):
324
 
        return self._timedelta_to_milliseconds(self.approval_delay)
325
 
    
326
 
    def __init__(self, name = None, disable_hook=None, config=None):
327
 
        """Note: the 'checker' key in 'config' sets the
328
 
        'checker_command' attribute and *not* the 'checker'
329
 
        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):
330
112
        self.name = name
331
 
        if config is None:
332
 
            config = {}
333
 
        logger.debug("Creating client %r", self.name)
334
 
        # Uppercase and remove spaces from fingerprint for later
335
 
        # comparison purposes with return value from the fingerprint()
336
 
        # function
337
 
        self.fingerprint = (config["fingerprint"].upper()
338
 
                            .replace(" ", ""))
339
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
340
 
        if "secret" in config:
341
 
            self.secret = config["secret"].decode("base64")
342
 
        elif "secfile" in config:
343
 
            with open(os.path.expanduser(os.path.expandvars
344
 
                                         (config["secfile"])),
345
 
                      "rb") as secfile:
346
 
                self.secret = secfile.read()
347
 
        else:
348
 
            raise TypeError("No secret or secfile for client %s"
349
 
                            % self.name)
350
 
        self.host = config.get("host", "")
351
 
        self.created = datetime.datetime.utcnow()
352
 
        self.enabled = False
353
 
        self.last_approval_request = None
354
 
        self.last_enabled = None
355
 
        self.last_checked_ok = None
356
 
        self.timeout = string_to_delta(config["timeout"])
357
 
        self.interval = string_to_delta(config["interval"])
358
 
        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
359
138
        self.checker = None
360
139
        self.checker_initiator_tag = None
361
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
362
141
        self.checker_callback_tag = None
363
 
        self.checker_command = config["checker"]
364
 
        self.current_checker_command = None
365
 
        self.last_connect = None
366
 
        self._approved = None
367
 
        self.approved_by_default = config.get("approved_by_default",
368
 
                                              True)
369
 
        self.approvals_pending = 0
370
 
        self.approval_delay = string_to_delta(
371
 
            config["approval_delay"])
372
 
        self.approval_duration = string_to_delta(
373
 
            config["approval_duration"])
374
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
375
 
    
376
 
    def send_changedstate(self):
377
 
        self.changedstate.acquire()
378
 
        self.changedstate.notify_all()
379
 
        self.changedstate.release()
380
 
        
381
 
    def enable(self):
382
 
        """Start this client's checker and timeout hooks"""
383
 
        if getattr(self, "enabled", False):
384
 
            # Already enabled
385
 
            return
386
 
        self.send_changedstate()
387
 
        self.last_enabled = datetime.datetime.utcnow()
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
388
145
        # Schedule a new checker to be started an 'interval' from now,
389
146
        # and every interval from then on.
390
 
        self.checker_initiator_tag = (gobject.timeout_add
391
 
                                      (self.interval_milliseconds(),
392
 
                                       self.start_checker))
393
 
        # Schedule a disable() when 'timeout' has passed
394
 
        self.disable_initiator_tag = (gobject.timeout_add
395
 
                                   (self.timeout_milliseconds(),
396
 
                                    self.disable))
397
 
        self.enabled = True
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
398
150
        # Also start a new checker *right now*.
399
151
        self.start_checker()
400
 
    
401
 
    def disable(self, quiet=True):
402
 
        """Disable this client."""
403
 
        if not getattr(self, "enabled", False):
404
 
            return False
405
 
        if not quiet:
406
 
            self.send_changedstate()
407
 
        if not quiet:
408
 
            logger.info("Disabling client %s", self.name)
409
 
        if getattr(self, "disable_initiator_tag", False):
410
 
            gobject.source_remove(self.disable_initiator_tag)
411
 
            self.disable_initiator_tag = None
412
 
        if getattr(self, "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:
413
166
            gobject.source_remove(self.checker_initiator_tag)
414
167
            self.checker_initiator_tag = None
415
168
        self.stop_checker()
416
 
        if self.disable_hook:
417
 
            self.disable_hook(self)
418
 
        self.enabled = False
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
419
171
        # Do not run this again if called by a gobject.timeout_add
420
172
        return False
421
 
    
422
173
    def __del__(self):
423
 
        self.disable_hook = None
424
 
        self.disable()
425
 
    
426
 
    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):
427
185
        """The checker has completed, so take appropriate actions."""
428
 
        self.checker_callback_tag = None
429
 
        self.checker = None
430
 
        if os.WIFEXITED(condition):
431
 
            exitstatus = os.WEXITSTATUS(condition)
432
 
            if exitstatus == 0:
433
 
                logger.info("Checker for %(name)s succeeded",
434
 
                            vars(self))
435
 
                self.checked_ok()
436
 
            else:
437
 
                logger.info("Checker for %(name)s failed",
438
 
                            vars(self))
439
 
        else:
440
 
            logger.warning("Checker for %(name)s crashed?",
 
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):
 
197
            logger.warning(u"Checker for %(name)s crashed?",
441
198
                           vars(self))
442
 
    
443
 
    def checked_ok(self):
444
 
        """Bump up the timeout for this client.
445
 
        
446
 
        This should only be called when the client has been seen,
447
 
        alive and well.
448
 
        """
449
 
        self.last_checked_ok = datetime.datetime.utcnow()
450
 
        gobject.source_remove(self.disable_initiator_tag)
451
 
        self.disable_initiator_tag = (gobject.timeout_add
452
 
                                      (self.timeout_milliseconds(),
453
 
                                       self.disable))
454
 
    
455
 
    def need_approval(self):
456
 
        self.last_approval_request = datetime.datetime.utcnow()
457
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
458
204
    def start_checker(self):
459
205
        """Start a new checker subprocess if one is not running.
460
 
        
461
206
        If a checker already exists, leave it running and do
462
207
        nothing."""
463
 
        # The reason for not killing a running checker is that if we
464
 
        # did that, then if a checker (for some reason) started
465
 
        # running slowly and taking more than 'interval' time, the
466
 
        # client would inevitably timeout, since no checker would get
467
 
        # a chance to run to completion.  If we instead leave running
468
 
        # checkers alone, the checker would have to take more time
469
 
        # than 'timeout' for the client to be disabled, which is as it
470
 
        # should be.
471
 
        
472
 
        # If a checker exists, make sure it is not a zombie
473
 
        try:
474
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
475
 
        except (AttributeError, OSError) as error:
476
 
            if (isinstance(error, OSError)
477
 
                and error.errno != errno.ECHILD):
478
 
                raise error
479
 
        else:
480
 
            if pid:
481
 
                logger.warning("Checker was a zombie")
482
 
                gobject.source_remove(self.checker_callback_tag)
483
 
                self.checker_callback(pid, status,
484
 
                                      self.current_checker_command)
485
 
        # Start a new checker if needed
486
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
487
211
            try:
488
 
                # In case checker_command has exactly one % operator
489
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
490
213
            except TypeError:
491
 
                # Escape attributes for the shell
492
 
                escaped_attrs = dict(
493
 
                    (attr,
494
 
                     re.escape(unicode(str(getattr(self, attr, "")),
495
 
                                       errors=
496
 
                                       'replace')))
497
 
                    for attr in
498
 
                    self.runtime_expansions)
499
 
 
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
500
217
                try:
501
 
                    command = self.checker_command % escaped_attrs
502
 
                except TypeError as error:
503
 
                    logger.error('Could not format string "%s":'
504
 
                                 ' %s', self.checker_command, error)
 
218
                    command = self.check_command % escaped_attrs
 
219
                except TypeError, error:
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
505
222
                    return True # Try again later
506
 
            self.current_checker_command = command
507
223
            try:
508
 
                logger.info("Starting checker %r for %s",
509
 
                            command, self.name)
510
 
                # We don't need to redirect stdout and stderr, since
511
 
                # in normal mode, that is already done by daemon(),
512
 
                # and in debug mode we don't want to.  (Stdin is
513
 
                # always replaced by /dev/null.)
514
 
                self.checker = subprocess.Popen(command,
515
 
                                                close_fds=True,
516
 
                                                shell=True, cwd="/")
517
 
                self.checker_callback_tag = (gobject.child_watch_add
518
 
                                             (self.checker.pid,
519
 
                                              self.checker_callback,
520
 
                                              data=command))
521
 
                # The checker may have completed before the gobject
522
 
                # watch was added.  Check for this.
523
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
524
 
                if pid:
525
 
                    gobject.source_remove(self.checker_callback_tag)
526
 
                    self.checker_callback(pid, status, command)
527
 
            except OSError as error:
528
 
                logger.error("Failed to start subprocess: %s",
 
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:
 
234
                logger.error(u"Failed to start subprocess: %s",
529
235
                             error)
530
236
        # Re-run this periodically if run by gobject.timeout_add
531
237
        return True
532
 
    
533
238
    def stop_checker(self):
534
239
        """Force the checker process, if any, to stop."""
535
 
        if self.checker_callback_tag:
536
 
            gobject.source_remove(self.checker_callback_tag)
537
 
            self.checker_callback_tag = None
538
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
539
241
            return
540
 
        logger.debug("Stopping checker for %(name)s", vars(self))
541
 
        try:
542
 
            os.kill(self.checker.pid, signal.SIGTERM)
543
 
            #time.sleep(0.5)
544
 
            #if self.checker.poll() is None:
545
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
546
 
        except OSError as error:
547
 
            if error.errno != errno.ESRCH: # No such process
548
 
                raise
549
 
        self.checker = None
550
 
 
551
 
def dbus_service_property(dbus_interface, signature="v",
552
 
                          access="readwrite", byte_arrays=False):
553
 
    """Decorators for marking methods of a DBusObjectWithProperties to
554
 
    become properties on the D-Bus.
555
 
    
556
 
    The decorated method will be called with no arguments by "Get"
557
 
    and with one argument by "Set".
558
 
    
559
 
    The parameters, where they are supported, are the same as
560
 
    dbus.service.method, except there is only "signature", since the
561
 
    type from Get() and the type sent to Set() is the same.
562
 
    """
563
 
    # Encoding deeply encoded byte arrays is not supported yet by the
564
 
    # "Set" method, so we fail early here:
565
 
    if byte_arrays and signature != "ay":
566
 
        raise ValueError("Byte arrays not supported for non-'ay'"
567
 
                         " signature %r" % signature)
568
 
    def decorator(func):
569
 
        func._dbus_is_property = True
570
 
        func._dbus_interface = dbus_interface
571
 
        func._dbus_signature = signature
572
 
        func._dbus_access = access
573
 
        func._dbus_name = func.__name__
574
 
        if func._dbus_name.endswith("_dbus_property"):
575
 
            func._dbus_name = func._dbus_name[:-14]
576
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
577
 
        return func
578
 
    return decorator
579
 
 
580
 
 
581
 
class DBusPropertyException(dbus.exceptions.DBusException):
582
 
    """A base class for D-Bus property-related exceptions
583
 
    """
584
 
    def __unicode__(self):
585
 
        return unicode(str(self))
586
 
 
587
 
 
588
 
class DBusPropertyAccessException(DBusPropertyException):
589
 
    """A property's access permissions disallows an operation.
590
 
    """
591
 
    pass
592
 
 
593
 
 
594
 
class DBusPropertyNotFound(DBusPropertyException):
595
 
    """An attempt was made to access a non-existing property.
596
 
    """
597
 
    pass
598
 
 
599
 
 
600
 
class DBusObjectWithProperties(dbus.service.Object):
601
 
    """A D-Bus object with properties.
602
 
 
603
 
    Classes inheriting from this can use the dbus_service_property
604
 
    decorator to expose methods as D-Bus properties.  It exposes the
605
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
606
 
    """
607
 
    
608
 
    @staticmethod
609
 
    def _is_dbus_property(obj):
610
 
        return getattr(obj, "_dbus_is_property", False)
611
 
    
612
 
    def _get_all_dbus_properties(self):
613
 
        """Returns a generator of (name, attribute) pairs
614
 
        """
615
 
        return ((prop._dbus_name, prop)
616
 
                for name, prop in
617
 
                inspect.getmembers(self, self._is_dbus_property))
618
 
    
619
 
    def _get_dbus_property(self, interface_name, property_name):
620
 
        """Returns a bound method if one exists which is a D-Bus
621
 
        property with the specified name and interface.
622
 
        """
623
 
        for name in (property_name,
624
 
                     property_name + "_dbus_property"):
625
 
            prop = getattr(self, name, None)
626
 
            if (prop is None
627
 
                or not self._is_dbus_property(prop)
628
 
                or prop._dbus_name != property_name
629
 
                or (interface_name and prop._dbus_interface
630
 
                    and interface_name != prop._dbus_interface)):
631
 
                continue
632
 
            return prop
633
 
        # No such property
634
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
635
 
                                   + interface_name + "."
636
 
                                   + property_name)
637
 
    
638
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
639
 
                         out_signature="v")
640
 
    def Get(self, interface_name, property_name):
641
 
        """Standard D-Bus property Get() method, see D-Bus standard.
642
 
        """
643
 
        prop = self._get_dbus_property(interface_name, property_name)
644
 
        if prop._dbus_access == "write":
645
 
            raise DBusPropertyAccessException(property_name)
646
 
        value = prop()
647
 
        if not hasattr(value, "variant_level"):
648
 
            return value
649
 
        return type(value)(value, variant_level=value.variant_level+1)
650
 
    
651
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
652
 
    def Set(self, interface_name, property_name, value):
653
 
        """Standard D-Bus property Set() method, see D-Bus standard.
654
 
        """
655
 
        prop = self._get_dbus_property(interface_name, property_name)
656
 
        if prop._dbus_access == "read":
657
 
            raise DBusPropertyAccessException(property_name)
658
 
        if prop._dbus_get_args_options["byte_arrays"]:
659
 
            # The byte_arrays option is not supported yet on
660
 
            # signatures other than "ay".
661
 
            if prop._dbus_signature != "ay":
662
 
                raise ValueError
663
 
            value = dbus.ByteArray(''.join(unichr(byte)
664
 
                                           for byte in value))
665
 
        prop(value)
666
 
    
667
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
668
 
                         out_signature="a{sv}")
669
 
    def GetAll(self, interface_name):
670
 
        """Standard D-Bus property GetAll() method, see D-Bus
671
 
        standard.
672
 
 
673
 
        Note: Will not include properties with access="write".
674
 
        """
675
 
        all = {}
676
 
        for name, prop in self._get_all_dbus_properties():
677
 
            if (interface_name
678
 
                and interface_name != prop._dbus_interface):
679
 
                # Interface non-empty but did not match
680
 
                continue
681
 
            # Ignore write-only properties
682
 
            if prop._dbus_access == "write":
683
 
                continue
684
 
            value = prop()
685
 
            if not hasattr(value, "variant_level"):
686
 
                all[name] = value
687
 
                continue
688
 
            all[name] = type(value)(value, variant_level=
689
 
                                    value.variant_level+1)
690
 
        return dbus.Dictionary(all, signature="sv")
691
 
    
692
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
693
 
                         out_signature="s",
694
 
                         path_keyword='object_path',
695
 
                         connection_keyword='connection')
696
 
    def Introspect(self, object_path, connection):
697
 
        """Standard D-Bus method, overloaded to insert property tags.
698
 
        """
699
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
700
 
                                                   connection)
701
 
        try:
702
 
            document = xml.dom.minidom.parseString(xmlstring)
703
 
            def make_tag(document, name, prop):
704
 
                e = document.createElement("property")
705
 
                e.setAttribute("name", name)
706
 
                e.setAttribute("type", prop._dbus_signature)
707
 
                e.setAttribute("access", prop._dbus_access)
708
 
                return e
709
 
            for if_tag in document.getElementsByTagName("interface"):
710
 
                for tag in (make_tag(document, name, prop)
711
 
                            for name, prop
712
 
                            in self._get_all_dbus_properties()
713
 
                            if prop._dbus_interface
714
 
                            == if_tag.getAttribute("name")):
715
 
                    if_tag.appendChild(tag)
716
 
                # Add the names to the return values for the
717
 
                # "org.freedesktop.DBus.Properties" methods
718
 
                if (if_tag.getAttribute("name")
719
 
                    == "org.freedesktop.DBus.Properties"):
720
 
                    for cn in if_tag.getElementsByTagName("method"):
721
 
                        if cn.getAttribute("name") == "Get":
722
 
                            for arg in cn.getElementsByTagName("arg"):
723
 
                                if (arg.getAttribute("direction")
724
 
                                    == "out"):
725
 
                                    arg.setAttribute("name", "value")
726
 
                        elif cn.getAttribute("name") == "GetAll":
727
 
                            for arg in cn.getElementsByTagName("arg"):
728
 
                                if (arg.getAttribute("direction")
729
 
                                    == "out"):
730
 
                                    arg.setAttribute("name", "props")
731
 
            xmlstring = document.toxml("utf-8")
732
 
            document.unlink()
733
 
        except (AttributeError, xml.dom.DOMException,
734
 
                xml.parsers.expat.ExpatError) as error:
735
 
            logger.error("Failed to override Introspection method",
736
 
                         error)
737
 
        return xmlstring
738
 
 
739
 
 
740
 
class ClientDBus(Client, DBusObjectWithProperties):
741
 
    """A Client class using D-Bus
742
 
    
743
 
    Attributes:
744
 
    dbus_object_path: dbus.ObjectPath
745
 
    bus: dbus.SystemBus()
746
 
    """
747
 
    
748
 
    runtime_expansions = (Client.runtime_expansions
749
 
                          + ("dbus_object_path",))
750
 
    
751
 
    # dbus.service.Object doesn't use super(), so we can't either.
752
 
    
753
 
    def __init__(self, bus = None, *args, **kwargs):
754
 
        self._approvals_pending = 0
755
 
        self.bus = bus
756
 
        Client.__init__(self, *args, **kwargs)
757
 
        # Only now, when this client is initialized, can it show up on
758
 
        # the D-Bus
759
 
        client_object_name = unicode(self.name).translate(
760
 
            {ord("."): ord("_"),
761
 
             ord("-"): ord("_")})
762
 
        self.dbus_object_path = (dbus.ObjectPath
763
 
                                 ("/clients/" + client_object_name))
764
 
        DBusObjectWithProperties.__init__(self, self.bus,
765
 
                                          self.dbus_object_path)
766
 
        
767
 
    def _get_approvals_pending(self):
768
 
        return self._approvals_pending
769
 
    def _set_approvals_pending(self, value):
770
 
        old_value = self._approvals_pending
771
 
        self._approvals_pending = value
772
 
        bval = bool(value)
773
 
        if (hasattr(self, "dbus_object_path")
774
 
            and bval is not bool(old_value)):
775
 
            dbus_bool = dbus.Boolean(bval, variant_level=1)
776
 
            self.PropertyChanged(dbus.String("ApprovalPending"),
777
 
                                 dbus_bool)
778
 
 
779
 
    approvals_pending = property(_get_approvals_pending,
780
 
                                 _set_approvals_pending)
781
 
    del _get_approvals_pending, _set_approvals_pending
782
 
    
783
 
    @staticmethod
784
 
    def _datetime_to_dbus(dt, variant_level=0):
785
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
786
 
        return dbus.String(dt.isoformat(),
787
 
                           variant_level=variant_level)
788
 
    
789
 
    def enable(self):
790
 
        oldstate = getattr(self, "enabled", False)
791
 
        r = Client.enable(self)
792
 
        if oldstate != self.enabled:
793
 
            # Emit D-Bus signals
794
 
            self.PropertyChanged(dbus.String("Enabled"),
795
 
                                 dbus.Boolean(True, variant_level=1))
796
 
            self.PropertyChanged(
797
 
                dbus.String("LastEnabled"),
798
 
                self._datetime_to_dbus(self.last_enabled,
799
 
                                       variant_level=1))
800
 
        return r
801
 
    
802
 
    def disable(self, quiet = False):
803
 
        oldstate = getattr(self, "enabled", False)
804
 
        r = Client.disable(self, quiet=quiet)
805
 
        if not quiet and oldstate != self.enabled:
806
 
            # Emit D-Bus signal
807
 
            self.PropertyChanged(dbus.String("Enabled"),
808
 
                                 dbus.Boolean(False, variant_level=1))
809
 
        return r
810
 
    
811
 
    def __del__(self, *args, **kwargs):
812
 
        try:
813
 
            self.remove_from_connection()
814
 
        except LookupError:
815
 
            pass
816
 
        if hasattr(DBusObjectWithProperties, "__del__"):
817
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
818
 
        Client.__del__(self, *args, **kwargs)
819
 
    
820
 
    def checker_callback(self, pid, condition, command,
821
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
822
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)
823
247
        self.checker = None
824
 
        # Emit D-Bus signal
825
 
        self.PropertyChanged(dbus.String("CheckerRunning"),
826
 
                             dbus.Boolean(False, variant_level=1))
827
 
        if os.WIFEXITED(condition):
828
 
            exitstatus = os.WEXITSTATUS(condition)
829
 
            # Emit D-Bus signal
830
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
831
 
                                  dbus.Int64(condition),
832
 
                                  dbus.String(command))
833
 
        else:
834
 
            # Emit D-Bus signal
835
 
            self.CheckerCompleted(dbus.Int16(-1),
836
 
                                  dbus.Int64(condition),
837
 
                                  dbus.String(command))
838
 
        
839
 
        return Client.checker_callback(self, pid, condition, command,
840
 
                                       *args, **kwargs)
841
 
    
842
 
    def checked_ok(self, *args, **kwargs):
843
 
        Client.checked_ok(self, *args, **kwargs)
844
 
        # Emit D-Bus signal
845
 
        self.PropertyChanged(
846
 
            dbus.String("LastCheckedOK"),
847
 
            (self._datetime_to_dbus(self.last_checked_ok,
848
 
                                    variant_level=1)))
849
 
    
850
 
    def need_approval(self, *args, **kwargs):
851
 
        r = Client.need_approval(self, *args, **kwargs)
852
 
        # Emit D-Bus signal
853
 
        self.PropertyChanged(
854
 
            dbus.String("LastApprovalRequest"),
855
 
            (self._datetime_to_dbus(self.last_approval_request,
856
 
                                    variant_level=1)))
857
 
        return r
858
 
    
859
 
    def start_checker(self, *args, **kwargs):
860
 
        old_checker = self.checker
861
 
        if self.checker is not None:
862
 
            old_checker_pid = self.checker.pid
863
 
        else:
864
 
            old_checker_pid = None
865
 
        r = Client.start_checker(self, *args, **kwargs)
866
 
        # Only if new checker process was started
867
 
        if (self.checker is not None
868
 
            and old_checker_pid != self.checker.pid):
869
 
            # Emit D-Bus signal
870
 
            self.CheckerStarted(self.current_checker_command)
871
 
            self.PropertyChanged(
872
 
                dbus.String("CheckerRunning"),
873
 
                dbus.Boolean(True, variant_level=1))
874
 
        return r
875
 
    
876
 
    def stop_checker(self, *args, **kwargs):
877
 
        old_checker = getattr(self, "checker", None)
878
 
        r = Client.stop_checker(self, *args, **kwargs)
879
 
        if (old_checker is not None
880
 
            and getattr(self, "checker", None) is None):
881
 
            self.PropertyChanged(dbus.String("CheckerRunning"),
882
 
                                 dbus.Boolean(False, variant_level=1))
883
 
        return r
884
 
 
885
 
    def _reset_approved(self):
886
 
        self._approved = None
887
 
        return False
888
 
    
889
 
    def approve(self, value=True):
890
 
        self.send_changedstate()
891
 
        self._approved = value
892
 
        gobject.timeout_add(self._timedelta_to_milliseconds
893
 
                            (self.approval_duration),
894
 
                            self._reset_approved)
895
 
    
896
 
    
897
 
    ## D-Bus methods, signals & properties
898
 
    _interface = "se.bsnet.fukt.Mandos.Client"
899
 
    
900
 
    ## Signals
901
 
    
902
 
    # CheckerCompleted - signal
903
 
    @dbus.service.signal(_interface, signature="nxs")
904
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
905
 
        "D-Bus signal"
906
 
        pass
907
 
    
908
 
    # CheckerStarted - signal
909
 
    @dbus.service.signal(_interface, signature="s")
910
 
    def CheckerStarted(self, command):
911
 
        "D-Bus signal"
912
 
        pass
913
 
    
914
 
    # PropertyChanged - signal
915
 
    @dbus.service.signal(_interface, signature="sv")
916
 
    def PropertyChanged(self, property, value):
917
 
        "D-Bus signal"
918
 
        pass
919
 
    
920
 
    # GotSecret - signal
921
 
    @dbus.service.signal(_interface)
922
 
    def GotSecret(self):
923
 
        """D-Bus signal
924
 
        Is sent after a successful transfer of secret from the Mandos
925
 
        server to mandos-client
926
 
        """
927
 
        pass
928
 
    
929
 
    # Rejected - signal
930
 
    @dbus.service.signal(_interface, signature="s")
931
 
    def Rejected(self, reason):
932
 
        "D-Bus signal"
933
 
        pass
934
 
    
935
 
    # NeedApproval - signal
936
 
    @dbus.service.signal(_interface, signature="tb")
937
 
    def NeedApproval(self, timeout, default):
938
 
        "D-Bus signal"
939
 
        return self.need_approval()
940
 
    
941
 
    ## Methods
942
 
    
943
 
    # Approve - method
944
 
    @dbus.service.method(_interface, in_signature="b")
945
 
    def Approve(self, value):
946
 
        self.approve(value)
947
 
    
948
 
    # CheckedOK - method
949
 
    @dbus.service.method(_interface)
950
 
    def CheckedOK(self):
951
 
        self.checked_ok()
952
 
    
953
 
    # Enable - method
954
 
    @dbus.service.method(_interface)
955
 
    def Enable(self):
956
 
        "D-Bus method"
957
 
        self.enable()
958
 
    
959
 
    # StartChecker - method
960
 
    @dbus.service.method(_interface)
961
 
    def StartChecker(self):
962
 
        "D-Bus method"
963
 
        self.start_checker()
964
 
    
965
 
    # Disable - method
966
 
    @dbus.service.method(_interface)
967
 
    def Disable(self):
968
 
        "D-Bus method"
969
 
        self.disable()
970
 
    
971
 
    # StopChecker - method
972
 
    @dbus.service.method(_interface)
973
 
    def StopChecker(self):
974
 
        self.stop_checker()
975
 
    
976
 
    ## Properties
977
 
    
978
 
    # ApprovalPending - property
979
 
    @dbus_service_property(_interface, signature="b", access="read")
980
 
    def ApprovalPending_dbus_property(self):
981
 
        return dbus.Boolean(bool(self.approvals_pending))
982
 
    
983
 
    # ApprovedByDefault - property
984
 
    @dbus_service_property(_interface, signature="b",
985
 
                           access="readwrite")
986
 
    def ApprovedByDefault_dbus_property(self, value=None):
987
 
        if value is None:       # get
988
 
            return dbus.Boolean(self.approved_by_default)
989
 
        self.approved_by_default = bool(value)
990
 
        # Emit D-Bus signal
991
 
        self.PropertyChanged(dbus.String("ApprovedByDefault"),
992
 
                             dbus.Boolean(value, variant_level=1))
993
 
    
994
 
    # ApprovalDelay - property
995
 
    @dbus_service_property(_interface, signature="t",
996
 
                           access="readwrite")
997
 
    def ApprovalDelay_dbus_property(self, value=None):
998
 
        if value is None:       # get
999
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1000
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1001
 
        # Emit D-Bus signal
1002
 
        self.PropertyChanged(dbus.String("ApprovalDelay"),
1003
 
                             dbus.UInt64(value, variant_level=1))
1004
 
    
1005
 
    # ApprovalDuration - property
1006
 
    @dbus_service_property(_interface, signature="t",
1007
 
                           access="readwrite")
1008
 
    def ApprovalDuration_dbus_property(self, value=None):
1009
 
        if value is None:       # get
1010
 
            return dbus.UInt64(self._timedelta_to_milliseconds(
1011
 
                    self.approval_duration))
1012
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1013
 
        # Emit D-Bus signal
1014
 
        self.PropertyChanged(dbus.String("ApprovalDuration"),
1015
 
                             dbus.UInt64(value, variant_level=1))
1016
 
    
1017
 
    # Name - property
1018
 
    @dbus_service_property(_interface, signature="s", access="read")
1019
 
    def Name_dbus_property(self):
1020
 
        return dbus.String(self.name)
1021
 
    
1022
 
    # Fingerprint - property
1023
 
    @dbus_service_property(_interface, signature="s", access="read")
1024
 
    def Fingerprint_dbus_property(self):
1025
 
        return dbus.String(self.fingerprint)
1026
 
    
1027
 
    # Host - property
1028
 
    @dbus_service_property(_interface, signature="s",
1029
 
                           access="readwrite")
1030
 
    def Host_dbus_property(self, value=None):
1031
 
        if value is None:       # get
1032
 
            return dbus.String(self.host)
1033
 
        self.host = value
1034
 
        # Emit D-Bus signal
1035
 
        self.PropertyChanged(dbus.String("Host"),
1036
 
                             dbus.String(value, variant_level=1))
1037
 
    
1038
 
    # Created - property
1039
 
    @dbus_service_property(_interface, signature="s", access="read")
1040
 
    def Created_dbus_property(self):
1041
 
        return dbus.String(self._datetime_to_dbus(self.created))
1042
 
    
1043
 
    # LastEnabled - property
1044
 
    @dbus_service_property(_interface, signature="s", access="read")
1045
 
    def LastEnabled_dbus_property(self):
1046
 
        if self.last_enabled is None:
1047
 
            return dbus.String("")
1048
 
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
1049
 
    
1050
 
    # Enabled - property
1051
 
    @dbus_service_property(_interface, signature="b",
1052
 
                           access="readwrite")
1053
 
    def Enabled_dbus_property(self, value=None):
1054
 
        if value is None:       # get
1055
 
            return dbus.Boolean(self.enabled)
1056
 
        if value:
1057
 
            self.enable()
1058
 
        else:
1059
 
            self.disable()
1060
 
    
1061
 
    # LastCheckedOK - property
1062
 
    @dbus_service_property(_interface, signature="s",
1063
 
                           access="readwrite")
1064
 
    def LastCheckedOK_dbus_property(self, value=None):
1065
 
        if value is not None:
1066
 
            self.checked_ok()
1067
 
            return
1068
 
        if self.last_checked_ok is None:
1069
 
            return dbus.String("")
1070
 
        return dbus.String(self._datetime_to_dbus(self
1071
 
                                                  .last_checked_ok))
1072
 
    
1073
 
    # LastApprovalRequest - property
1074
 
    @dbus_service_property(_interface, signature="s", access="read")
1075
 
    def LastApprovalRequest_dbus_property(self):
1076
 
        if self.last_approval_request is None:
1077
 
            return dbus.String("")
1078
 
        return dbus.String(self.
1079
 
                           _datetime_to_dbus(self
1080
 
                                             .last_approval_request))
1081
 
    
1082
 
    # Timeout - property
1083
 
    @dbus_service_property(_interface, signature="t",
1084
 
                           access="readwrite")
1085
 
    def Timeout_dbus_property(self, value=None):
1086
 
        if value is None:       # get
1087
 
            return dbus.UInt64(self.timeout_milliseconds())
1088
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1089
 
        # Emit D-Bus signal
1090
 
        self.PropertyChanged(dbus.String("Timeout"),
1091
 
                             dbus.UInt64(value, variant_level=1))
1092
 
        if getattr(self, "disable_initiator_tag", None) is None:
1093
 
            return
1094
 
        # Reschedule timeout
1095
 
        gobject.source_remove(self.disable_initiator_tag)
1096
 
        self.disable_initiator_tag = None
1097
 
        time_to_die = (self.
1098
 
                       _timedelta_to_milliseconds((self
1099
 
                                                   .last_checked_ok
1100
 
                                                   + self.timeout)
1101
 
                                                  - datetime.datetime
1102
 
                                                  .utcnow()))
1103
 
        if time_to_die <= 0:
1104
 
            # The timeout has passed
1105
 
            self.disable()
1106
 
        else:
1107
 
            self.disable_initiator_tag = (gobject.timeout_add
1108
 
                                          (time_to_die, self.disable))
1109
 
    
1110
 
    # Interval - property
1111
 
    @dbus_service_property(_interface, signature="t",
1112
 
                           access="readwrite")
1113
 
    def Interval_dbus_property(self, value=None):
1114
 
        if value is None:       # get
1115
 
            return dbus.UInt64(self.interval_milliseconds())
1116
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1117
 
        # Emit D-Bus signal
1118
 
        self.PropertyChanged(dbus.String("Interval"),
1119
 
                             dbus.UInt64(value, variant_level=1))
1120
 
        if getattr(self, "checker_initiator_tag", None) is None:
1121
 
            return
1122
 
        # Reschedule checker run
1123
 
        gobject.source_remove(self.checker_initiator_tag)
1124
 
        self.checker_initiator_tag = (gobject.timeout_add
1125
 
                                      (value, self.start_checker))
1126
 
        self.start_checker()    # Start one now, too
1127
 
 
1128
 
    # Checker - property
1129
 
    @dbus_service_property(_interface, signature="s",
1130
 
                           access="readwrite")
1131
 
    def Checker_dbus_property(self, value=None):
1132
 
        if value is None:       # get
1133
 
            return dbus.String(self.checker_command)
1134
 
        self.checker_command = value
1135
 
        # Emit D-Bus signal
1136
 
        self.PropertyChanged(dbus.String("Checker"),
1137
 
                             dbus.String(self.checker_command,
1138
 
                                         variant_level=1))
1139
 
    
1140
 
    # CheckerRunning - property
1141
 
    @dbus_service_property(_interface, signature="b",
1142
 
                           access="readwrite")
1143
 
    def CheckerRunning_dbus_property(self, value=None):
1144
 
        if value is None:       # get
1145
 
            return dbus.Boolean(self.checker is not None)
1146
 
        if value:
1147
 
            self.start_checker()
1148
 
        else:
1149
 
            self.stop_checker()
1150
 
    
1151
 
    # ObjectPath - property
1152
 
    @dbus_service_property(_interface, signature="o", access="read")
1153
 
    def ObjectPath_dbus_property(self):
1154
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1155
 
    
1156
 
    # Secret = property
1157
 
    @dbus_service_property(_interface, signature="ay",
1158
 
                           access="write", byte_arrays=True)
1159
 
    def Secret_dbus_property(self, value):
1160
 
        self.secret = str(value)
1161
 
    
1162
 
    del _interface
1163
 
 
1164
 
 
1165
 
class ProxyClient(object):
1166
 
    def __init__(self, child_pipe, fpr, address):
1167
 
        self._pipe = child_pipe
1168
 
        self._pipe.send(('init', fpr, address))
1169
 
        if not self._pipe.recv():
1170
 
            raise KeyError()
1171
 
 
1172
 
    def __getattribute__(self, name):
1173
 
        if(name == '_pipe'):
1174
 
            return super(ProxyClient, self).__getattribute__(name)
1175
 
        self._pipe.send(('getattr', name))
1176
 
        data = self._pipe.recv()
1177
 
        if data[0] == 'data':
1178
 
            return data[1]
1179
 
        if data[0] == 'function':
1180
 
            def func(*args, **kwargs):
1181
 
                self._pipe.send(('funcall', name, args, kwargs))
1182
 
                return self._pipe.recv()[1]
1183
 
            return func
1184
 
 
1185
 
    def __setattr__(self, name, value):
1186
 
        if(name == '_pipe'):
1187
 
            return super(ProxyClient, self).__setattr__(name, value)
1188
 
        self._pipe.send(('setattr', name, value))
1189
 
 
1190
 
 
1191
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1192
 
    """A class to handle client connections.
1193
 
    
1194
 
    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.
1195
307
    Note: This will run in its own forked process."""
1196
308
    
1197
309
    def handle(self):
1198
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1199
 
            logger.info("TCP connection from: %s",
1200
 
                        unicode(self.client_address))
1201
 
            logger.debug("Pipe FD: %d",
1202
 
                         self.server.child_pipe.fileno())
1203
 
 
1204
 
            session = (gnutls.connection
1205
 
                       .ClientSession(self.request,
1206
 
                                      gnutls.connection
1207
 
                                      .X509Credentials()))
1208
 
 
1209
 
            # Note: gnutls.connection.X509Credentials is really a
1210
 
            # generic GnuTLS certificate credentials object so long as
1211
 
            # no X.509 keys are added to it.  Therefore, we can use it
1212
 
            # here despite using OpenPGP certificates.
1213
 
 
1214
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1215
 
            #                      "+AES-256-CBC", "+SHA1",
1216
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1217
 
            #                      "+DHE-DSS"))
1218
 
            # Use a fallback default, since this MUST be set.
1219
 
            priority = self.server.gnutls_priority
1220
 
            if priority is None:
1221
 
                priority = "NORMAL"
1222
 
            (gnutls.library.functions
1223
 
             .gnutls_priority_set_direct(session._c_object,
1224
 
                                         priority, None))
1225
 
 
1226
 
            # Start communication using the Mandos protocol
1227
 
            # Get protocol number
1228
 
            line = self.request.makefile().readline()
1229
 
            logger.debug("Protocol version: %r", line)
1230
 
            try:
1231
 
                if int(line.strip().split()[0]) > 1:
1232
 
                    raise RuntimeError
1233
 
            except (ValueError, IndexError, RuntimeError) as error:
1234
 
                logger.error("Unknown protocol version: %s", error)
1235
 
                return
1236
 
 
1237
 
            # Start GnuTLS connection
1238
 
            try:
1239
 
                session.handshake()
1240
 
            except gnutls.errors.GNUTLSError as error:
1241
 
                logger.warning("Handshake failed: %s", error)
1242
 
                # Do not run session.bye() here: the session is not
1243
 
                # established.  Just abandon the request.
1244
 
                return
1245
 
            logger.debug("Handshake succeeded")
1246
 
 
1247
 
            approval_required = False
1248
 
            try:
1249
 
                try:
1250
 
                    fpr = self.fingerprint(self.peer_certificate
1251
 
                                           (session))
1252
 
                except (TypeError,
1253
 
                        gnutls.errors.GNUTLSError) as error:
1254
 
                    logger.warning("Bad certificate: %s", error)
1255
 
                    return
1256
 
                logger.debug("Fingerprint: %s", fpr)
1257
 
 
1258
 
                try:
1259
 
                    client = ProxyClient(child_pipe, fpr,
1260
 
                                         self.client_address)
1261
 
                except KeyError:
1262
 
                    return
1263
 
                
1264
 
                if client.approval_delay:
1265
 
                    delay = client.approval_delay
1266
 
                    client.approvals_pending += 1
1267
 
                    approval_required = True
1268
 
                
1269
 
                while True:
1270
 
                    if not client.enabled:
1271
 
                        logger.info("Client %s is disabled",
1272
 
                                       client.name)
1273
 
                        if self.server.use_dbus:
1274
 
                            # Emit D-Bus signal
1275
 
                            client.Rejected("Disabled")                    
1276
 
                        return
1277
 
                    
1278
 
                    if client._approved or not client.approval_delay:
1279
 
                        #We are approved or approval is disabled
1280
 
                        break
1281
 
                    elif client._approved is None:
1282
 
                        logger.info("Client %s needs approval",
1283
 
                                    client.name)
1284
 
                        if self.server.use_dbus:
1285
 
                            # Emit D-Bus signal
1286
 
                            client.NeedApproval(
1287
 
                                client.approval_delay_milliseconds(),
1288
 
                                client.approved_by_default)
1289
 
                    else:
1290
 
                        logger.warning("Client %s was not approved",
1291
 
                                       client.name)
1292
 
                        if self.server.use_dbus:
1293
 
                            # Emit D-Bus signal
1294
 
                            client.Rejected("Denied")
1295
 
                        return
1296
 
                    
1297
 
                    #wait until timeout or approved
1298
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1299
 
                    time = datetime.datetime.now()
1300
 
                    client.changedstate.acquire()
1301
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1302
 
                    client.changedstate.release()
1303
 
                    time2 = datetime.datetime.now()
1304
 
                    if (time2 - time) >= delay:
1305
 
                        if not client.approved_by_default:
1306
 
                            logger.warning("Client %s timed out while"
1307
 
                                           " waiting for approval",
1308
 
                                           client.name)
1309
 
                            if self.server.use_dbus:
1310
 
                                # Emit D-Bus signal
1311
 
                                client.Rejected("Approval timed out")
1312
 
                            return
1313
 
                        else:
1314
 
                            break
1315
 
                    else:
1316
 
                        delay -= time2 - time
1317
 
                
1318
 
                sent_size = 0
1319
 
                while sent_size < len(client.secret):
1320
 
                    try:
1321
 
                        sent = session.send(client.secret[sent_size:])
1322
 
                    except gnutls.errors.GNUTLSError as error:
1323
 
                        logger.warning("gnutls send failed")
1324
 
                        return
1325
 
                    logger.debug("Sent: %d, remaining: %d",
1326
 
                                 sent, len(client.secret)
1327
 
                                 - (sent_size + sent))
1328
 
                    sent_size += sent
1329
 
 
1330
 
                logger.info("Sending secret to %s", client.name)
1331
 
                # bump the timeout as if seen
1332
 
                client.checked_ok()
1333
 
                if self.server.use_dbus:
1334
 
                    # Emit D-Bus signal
1335
 
                    client.GotSecret()
1336
 
            
1337
 
            finally:
1338
 
                if approval_required:
1339
 
                    client.approvals_pending -= 1
1340
 
                try:
1341
 
                    session.bye()
1342
 
                except gnutls.errors.GNUTLSError as error:
1343
 
                    logger.warning("GnuTLS bye failed")
1344
 
    
1345
 
    @staticmethod
1346
 
    def peer_certificate(session):
1347
 
        "Return the peer's OpenPGP certificate as a bytestring"
1348
 
        # If not an OpenPGP certificate...
1349
 
        if (gnutls.library.functions
1350
 
            .gnutls_certificate_type_get(session._c_object)
1351
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1352
 
            # ...do the normal thing
1353
 
            return session.peer_certificate
1354
 
        list_size = ctypes.c_uint(1)
1355
 
        cert_list = (gnutls.library.functions
1356
 
                     .gnutls_certificate_get_peers
1357
 
                     (session._c_object, ctypes.byref(list_size)))
1358
 
        if not bool(cert_list) and list_size.value != 0:
1359
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1360
 
                                            " certificate")
1361
 
        if list_size.value == 0:
1362
 
            return None
1363
 
        cert = cert_list[0]
1364
 
        return ctypes.string_at(cert.data, cert.size)
1365
 
    
1366
 
    @staticmethod
1367
 
    def fingerprint(openpgp):
1368
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1369
 
        # New GnuTLS "datum" with the OpenPGP public key
1370
 
        datum = (gnutls.library.types
1371
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1372
 
                                             ctypes.POINTER
1373
 
                                             (ctypes.c_ubyte)),
1374
 
                                 ctypes.c_uint(len(openpgp))))
1375
 
        # New empty GnuTLS certificate
1376
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1377
 
        (gnutls.library.functions
1378
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1379
 
        # Import the OpenPGP public key into the certificate
1380
 
        (gnutls.library.functions
1381
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1382
 
                                    gnutls.library.constants
1383
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1384
 
        # Verify the self signature in the key
1385
 
        crtverify = ctypes.c_uint()
1386
 
        (gnutls.library.functions
1387
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1388
 
                                         ctypes.byref(crtverify)))
1389
 
        if crtverify.value != 0:
1390
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1391
 
            raise (gnutls.errors.CertificateSecurityError
1392
 
                   ("Verify failed"))
1393
 
        # New buffer for the fingerprint
1394
 
        buf = ctypes.create_string_buffer(20)
1395
 
        buf_len = ctypes.c_size_t()
1396
 
        # Get the fingerprint from the certificate into the buffer
1397
 
        (gnutls.library.functions
1398
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1399
 
                                             ctypes.byref(buf_len)))
1400
 
        # Deinit the certificate
1401
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1402
 
        # Convert the buffer to a Python bytestring
1403
 
        fpr = ctypes.string_at(buf, buf_len.value)
1404
 
        # Convert the bytestring to hexadecimal notation
1405
 
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1406
 
        return hex_fpr
1407
 
 
1408
 
 
1409
 
class MultiprocessingMixIn(object):
1410
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1411
 
    def sub_process_main(self, request, address):
1412
 
        try:
1413
 
            self.finish_request(request, address)
1414
 
        except:
1415
 
            self.handle_error(request, address)
1416
 
        self.close_request(request)
1417
 
            
1418
 
    def process_request(self, request, address):
1419
 
        """Start a new process to process the request."""
1420
 
        multiprocessing.Process(target = self.sub_process_main,
1421
 
                                args = (request, address)).start()
1422
 
 
1423
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1424
 
    """ adds a pipe to the MixIn """
1425
 
    def process_request(self, request, client_address):
1426
 
        """Overrides and wraps the original process_request().
1427
 
        
1428
 
        This function creates a new pipe in self.pipe
1429
 
        """
1430
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1431
 
 
1432
 
        super(MultiprocessingMixInWithPipe,
1433
 
              self).process_request(request, client_address)
1434
 
        self.child_pipe.close()
1435
 
        self.add_pipe(parent_pipe)
1436
 
 
1437
 
    def add_pipe(self, parent_pipe):
1438
 
        """Dummy function; override as necessary"""
1439
 
        raise NotImplementedError
1440
 
 
1441
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1442
 
                     socketserver.TCPServer, object):
1443
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1444
 
    
 
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.
1445
367
    Attributes:
1446
 
        enabled:        Boolean; whether this server is activated yet
1447
 
        interface:      None or a network interface name (string)
1448
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1449
370
    """
1450
 
    def __init__(self, server_address, RequestHandlerClass,
1451
 
                 interface=None, use_ipv6=True):
1452
 
        self.interface = interface
1453
 
        if use_ipv6:
1454
 
            self.address_family = socket.AF_INET6
1455
 
        socketserver.TCPServer.__init__(self, server_address,
1456
 
                                        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)
1457
380
    def server_bind(self):
1458
381
        """This overrides the normal server_bind() function
1459
382
        to bind to an interface if one was specified, and also NOT to
1460
383
        bind to an address or port if they were not specified."""
1461
 
        if self.interface is not None:
1462
 
            if SO_BINDTODEVICE is None:
1463
 
                logger.error("SO_BINDTODEVICE does not exist;"
1464
 
                             " cannot bind to interface %s",
1465
 
                             self.interface)
1466
 
            else:
1467
 
                try:
1468
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1469
 
                                           SO_BINDTODEVICE,
1470
 
                                           str(self.interface
1471
 
                                               + '\0'))
1472
 
                except socket.error as error:
1473
 
                    if error[0] == errno.EPERM:
1474
 
                        logger.error("No permission to"
1475
 
                                     " bind to interface %s",
1476
 
                                     self.interface)
1477
 
                    elif error[0] == errno.ENOPROTOOPT:
1478
 
                        logger.error("SO_BINDTODEVICE not available;"
1479
 
                                     " cannot bind to interface %s",
1480
 
                                     self.interface)
1481
 
                    else:
1482
 
                        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
1483
399
        # Only bind(2) the socket if we really need to.
1484
400
        if self.server_address[0] or self.server_address[1]:
1485
401
            if not self.server_address[0]:
1486
 
                if self.address_family == socket.AF_INET6:
1487
 
                    any_address = "::" # in6addr_any
1488
 
                else:
1489
 
                    any_address = socket.INADDR_ANY
1490
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1491
404
                                       self.server_address[1])
1492
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1493
406
                self.server_address = (self.server_address[0],
1494
407
                                       0)
1495
 
#                 if self.interface:
1496
 
#                     self.server_address = (self.server_address[0],
1497
 
#                                            0, # port
1498
 
#                                            0, # flowinfo
1499
 
#                                            if_nametoindex
1500
 
#                                            (self.interface))
1501
 
            return socketserver.TCPServer.server_bind(self)
1502
 
 
1503
 
 
1504
 
class MandosServer(IPv6_TCPServer):
1505
 
    """Mandos server.
1506
 
    
1507
 
    Attributes:
1508
 
        clients:        set of Client objects
1509
 
        gnutls_priority GnuTLS priority string
1510
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1511
 
    
1512
 
    Assumes a gobject.MainLoop event loop.
1513
 
    """
1514
 
    def __init__(self, server_address, RequestHandlerClass,
1515
 
                 interface=None, use_ipv6=True, clients=None,
1516
 
                 gnutls_priority=None, use_dbus=True):
1517
 
        self.enabled = False
1518
 
        self.clients = clients
1519
 
        if self.clients is None:
1520
 
            self.clients = set()
1521
 
        self.use_dbus = use_dbus
1522
 
        self.gnutls_priority = gnutls_priority
1523
 
        IPv6_TCPServer.__init__(self, server_address,
1524
 
                                RequestHandlerClass,
1525
 
                                interface = interface,
1526
 
                                use_ipv6 = use_ipv6)
1527
 
    def server_activate(self):
1528
 
        if self.enabled:
1529
 
            return socketserver.TCPServer.server_activate(self)
1530
 
    def enable(self):
1531
 
        self.enabled = True
1532
 
    def add_pipe(self, parent_pipe):
1533
 
        # Call "handle_ipc" for both data and EOF events
1534
 
        gobject.io_add_watch(parent_pipe.fileno(),
1535
 
                             gobject.IO_IN | gobject.IO_HUP,
1536
 
                             functools.partial(self.handle_ipc,
1537
 
                                               parent_pipe = parent_pipe))
1538
 
        
1539
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1540
 
                   client_object=None):
1541
 
        condition_names = {
1542
 
            gobject.IO_IN: "IN",   # There is data to read.
1543
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1544
 
                                    # blocking).
1545
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1546
 
            gobject.IO_ERR: "ERR", # Error condition.
1547
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1548
 
                                    # broken, usually for pipes and
1549
 
                                    # sockets).
1550
 
            }
1551
 
        conditions_string = ' | '.join(name
1552
 
                                       for cond, name in
1553
 
                                       condition_names.iteritems()
1554
 
                                       if cond & condition)
1555
 
        # error or the other end of multiprocessing.Pipe has closed
1556
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1557
 
            return False
1558
 
        
1559
 
        # Read a request from the child
1560
 
        request = parent_pipe.recv()
1561
 
        command = request[0]
1562
 
        
1563
 
        if command == 'init':
1564
 
            fpr = request[1]
1565
 
            address = request[2]
1566
 
            
1567
 
            for c in self.clients:
1568
 
                if c.fingerprint == fpr:
1569
 
                    client = c
1570
 
                    break
1571
 
            else:
1572
 
                logger.info("Client not found for fingerprint: %s, ad"
1573
 
                            "dress: %s", fpr, address)
1574
 
                if self.use_dbus:
1575
 
                    # Emit D-Bus signal
1576
 
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
1577
 
                parent_pipe.send(False)
1578
 
                return False
1579
 
            
1580
 
            gobject.io_add_watch(parent_pipe.fileno(),
1581
 
                                 gobject.IO_IN | gobject.IO_HUP,
1582
 
                                 functools.partial(self.handle_ipc,
1583
 
                                                   parent_pipe = parent_pipe,
1584
 
                                                   client_object = client))
1585
 
            parent_pipe.send(True)
1586
 
            # remove the old hook in favor of the new above hook on same fileno
1587
 
            return False
1588
 
        if command == 'funcall':
1589
 
            funcname = request[1]
1590
 
            args = request[2]
1591
 
            kwargs = request[3]
1592
 
            
1593
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1594
 
 
1595
 
        if command == 'getattr':
1596
 
            attrname = request[1]
1597
 
            if callable(client_object.__getattribute__(attrname)):
1598
 
                parent_pipe.send(('function',))
1599
 
            else:
1600
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1601
 
        
1602
 
        if command == 'setattr':
1603
 
            attrname = request[1]
1604
 
            value = request[2]
1605
 
            setattr(client_object, attrname, value)
1606
 
 
1607
 
        return True
 
408
            return super(type(self), self).server_bind()
1608
409
 
1609
410
 
1610
411
def string_to_delta(interval):
1611
412
    """Parse a string and return a datetime.timedelta
1612
 
    
 
413
 
1613
414
    >>> string_to_delta('7d')
1614
415
    datetime.timedelta(7)
1615
416
    >>> string_to_delta('60s')
1618
419
    datetime.timedelta(0, 3600)
1619
420
    >>> string_to_delta('24h')
1620
421
    datetime.timedelta(1)
1621
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1622
423
    datetime.timedelta(7)
1623
 
    >>> string_to_delta('5m 30s')
1624
 
    datetime.timedelta(0, 330)
1625
424
    """
1626
 
    timevalue = datetime.timedelta(0)
1627
 
    for s in interval.split():
1628
 
        try:
1629
 
            suffix = unicode(s[-1])
1630
 
            value = int(s[:-1])
1631
 
            if suffix == "d":
1632
 
                delta = datetime.timedelta(value)
1633
 
            elif suffix == "s":
1634
 
                delta = datetime.timedelta(0, value)
1635
 
            elif suffix == "m":
1636
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1637
 
            elif suffix == "h":
1638
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1639
 
            elif suffix == "w":
1640
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1641
 
            else:
1642
 
                raise ValueError("Unknown suffix %r" % suffix)
1643
 
        except (ValueError, IndexError) as e:
1644
 
            raise ValueError(*(e.args))
1645
 
        timevalue += delta
1646
 
    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
1647
515
 
1648
516
 
1649
517
def if_nametoindex(interface):
1650
 
    """Call the C function if_nametoindex(), or equivalent
1651
 
    
1652
 
    Note: This function cannot accept a unicode string."""
1653
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1654
519
    try:
1655
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1656
 
                          (ctypes.util.find_library("c"))
1657
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1658
522
    except (OSError, AttributeError):
1659
 
        logger.warning("Doing if_nametoindex the hard way")
1660
 
        def if_nametoindex(interface):
1661
 
            "Get an interface index the hard way, i.e. using fcntl()"
1662
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1663
 
            with contextlib.closing(socket.socket()) as s:
1664
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1665
 
                                    struct.pack(str("16s16x"),
1666
 
                                                interface))
1667
 
            interface_index = struct.unpack(str("I"),
1668
 
                                            ifreq[16:20])[0]
1669
 
            return interface_index
1670
 
    return if_nametoindex(interface)
1671
 
 
1672
 
 
1673
 
def daemon(nochdir = False, noclose = False):
1674
 
    """See daemon(3).  Standard BSD Unix function.
1675
 
    
1676
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1677
 
    if os.fork():
1678
 
        sys.exit()
1679
 
    os.setsid()
1680
 
    if not nochdir:
1681
 
        os.chdir("/")
1682
 
    if os.fork():
1683
 
        sys.exit()
1684
 
    if not noclose:
1685
 
        # Close all standard open file descriptors
1686
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1687
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1688
 
            raise OSError(errno.ENODEV,
1689
 
                          "%s not a character device"
1690
 
                          % os.path.devnull)
1691
 
        os.dup2(null, sys.stdin.fileno())
1692
 
        os.dup2(null, sys.stdout.fileno())
1693
 
        os.dup2(null, sys.stderr.fileno())
1694
 
        if null > 2:
1695
 
            os.close(null)
1696
 
 
1697
 
 
1698
 
def main():
1699
 
    
1700
 
    ##################################################################
1701
 
    # Parsing of options, both command line and config file
1702
 
    
1703
 
    parser = argparse.ArgumentParser()
1704
 
    parser.add_argument("-v", "--version", action="version",
1705
 
                        version = "%%(prog)s %s" % version,
1706
 
                        help="show version number and exit")
1707
 
    parser.add_argument("-i", "--interface", metavar="IF",
1708
 
                        help="Bind to interface IF")
1709
 
    parser.add_argument("-a", "--address",
1710
 
                        help="Address to listen for requests on")
1711
 
    parser.add_argument("-p", "--port", type=int,
1712
 
                        help="Port number to receive requests on")
1713
 
    parser.add_argument("--check", action="store_true",
1714
 
                        help="Run self-test")
1715
 
    parser.add_argument("--debug", action="store_true",
1716
 
                        help="Debug mode; run in foreground and log"
1717
 
                        " to terminal")
1718
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1719
 
                        help="Debug level for stdout output")
1720
 
    parser.add_argument("--priority", help="GnuTLS"
1721
 
                        " priority string (see GnuTLS documentation)")
1722
 
    parser.add_argument("--servicename",
1723
 
                        metavar="NAME", help="Zeroconf service name")
1724
 
    parser.add_argument("--configdir",
1725
 
                        default="/etc/mandos", metavar="DIR",
1726
 
                        help="Directory to search for configuration"
1727
 
                        " files")
1728
 
    parser.add_argument("--no-dbus", action="store_false",
1729
 
                        dest="use_dbus", help="Do not provide D-Bus"
1730
 
                        " system bus interface")
1731
 
    parser.add_argument("--no-ipv6", action="store_false",
1732
 
                        dest="use_ipv6", help="Do not use IPv6")
1733
 
    options = parser.parse_args()
 
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()
1734
566
    
1735
567
    if options.check:
1736
568
        import doctest
1737
569
        doctest.testmod()
1738
570
        sys.exit()
1739
571
    
1740
 
    # Default values for config file for server-global settings
1741
 
    server_defaults = { "interface": "",
1742
 
                        "address": "",
1743
 
                        "port": "",
1744
 
                        "debug": "False",
1745
 
                        "priority":
1746
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1747
 
                        "servicename": "Mandos",
1748
 
                        "use_dbus": "True",
1749
 
                        "use_ipv6": "True",
1750
 
                        "debuglevel": "",
1751
 
                        }
1752
 
    
1753
 
    # Parse config file for server-global settings
1754
 
    server_config = configparser.SafeConfigParser(server_defaults)
1755
 
    del server_defaults
1756
 
    server_config.read(os.path.join(options.configdir,
1757
 
                                    "mandos.conf"))
1758
 
    # Convert the SafeConfigParser object to a dict
1759
 
    server_settings = server_config.defaults()
1760
 
    # Use the appropriate methods on the non-string config options
1761
 
    for option in ("debug", "use_dbus", "use_ipv6"):
1762
 
        server_settings[option] = server_config.getboolean("DEFAULT",
1763
 
                                                           option)
1764
 
    if server_settings["port"]:
1765
 
        server_settings["port"] = server_config.getint("DEFAULT",
1766
 
                                                       "port")
1767
 
    del server_config
1768
 
    
1769
 
    # Override the settings from the config file with command line
1770
 
    # options, if set.
1771
 
    for option in ("interface", "address", "port", "debug",
1772
 
                   "priority", "servicename", "configdir",
1773
 
                   "use_dbus", "use_ipv6", "debuglevel"):
1774
 
        value = getattr(options, option)
1775
 
        if value is not None:
1776
 
            server_settings[option] = value
1777
 
    del options
1778
 
    # Force all strings to be unicode
1779
 
    for option in server_settings.keys():
1780
 
        if type(server_settings[option]) is str:
1781
 
            server_settings[option] = unicode(server_settings[option])
1782
 
    # Now we have our good server settings in "server_settings"
1783
 
    
1784
 
    ##################################################################
1785
 
    
1786
 
    # For convenience
1787
 
    debug = server_settings["debug"]
1788
 
    debuglevel = server_settings["debuglevel"]
1789
 
    use_dbus = server_settings["use_dbus"]
1790
 
    use_ipv6 = server_settings["use_ipv6"]
1791
 
 
1792
 
    if server_settings["servicename"] != "Mandos":
1793
 
        syslogger.setFormatter(logging.Formatter
1794
 
                               ('Mandos (%s) [%%(process)d]:'
1795
 
                                ' %%(levelname)s: %%(message)s'
1796
 
                                % server_settings["servicename"]))
1797
 
    
1798
 
    # Parse config file with clients
1799
 
    client_defaults = { "timeout": "1h",
1800
 
                        "interval": "5m",
1801
 
                        "checker": "fping -q -- %%(host)s",
1802
 
                        "host": "",
1803
 
                        "approval_delay": "0s",
1804
 
                        "approval_duration": "1s",
1805
 
                        }
1806
 
    client_config = configparser.SafeConfigParser(client_defaults)
1807
 
    client_config.read(os.path.join(server_settings["configdir"],
1808
 
                                    "clients.conf"))
1809
 
    
1810
 
    global mandos_dbus_service
1811
 
    mandos_dbus_service = None
1812
 
    
1813
 
    tcp_server = MandosServer((server_settings["address"],
1814
 
                               server_settings["port"]),
1815
 
                              ClientHandler,
1816
 
                              interface=(server_settings["interface"]
1817
 
                                         or None),
1818
 
                              use_ipv6=use_ipv6,
1819
 
                              gnutls_priority=
1820
 
                              server_settings["priority"],
1821
 
                              use_dbus=use_dbus)
1822
 
    if not debug:
1823
 
        pidfilename = "/var/run/mandos.pid"
1824
 
        try:
1825
 
            pidfile = open(pidfilename, "w")
1826
 
        except IOError:
1827
 
            logger.error("Could not open file %r", pidfilename)
1828
 
    
1829
 
    try:
1830
 
        uid = pwd.getpwnam("_mandos").pw_uid
1831
 
        gid = pwd.getpwnam("_mandos").pw_gid
1832
 
    except KeyError:
1833
 
        try:
1834
 
            uid = pwd.getpwnam("mandos").pw_uid
1835
 
            gid = pwd.getpwnam("mandos").pw_gid
1836
 
        except KeyError:
1837
 
            try:
1838
 
                uid = pwd.getpwnam("nobody").pw_uid
1839
 
                gid = pwd.getpwnam("nobody").pw_gid
1840
 
            except KeyError:
1841
 
                uid = 65534
1842
 
                gid = 65534
1843
 
    try:
1844
 
        os.setgid(gid)
1845
 
        os.setuid(uid)
1846
 
    except OSError as error:
1847
 
        if error[0] != errno.EPERM:
1848
 
            raise error
1849
 
    
1850
 
    if not debug and not debuglevel:
1851
 
        syslogger.setLevel(logging.WARNING)
1852
 
        console.setLevel(logging.WARNING)
1853
 
    if debuglevel:
1854
 
        level = getattr(logging, debuglevel.upper())
1855
 
        syslogger.setLevel(level)
1856
 
        console.setLevel(level)
1857
 
 
1858
 
    if debug:
1859
 
        # Enable all possible GnuTLS debugging
1860
 
        
1861
 
        # "Use a log level over 10 to enable all debugging options."
1862
 
        # - GnuTLS manual
1863
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1864
 
        
1865
 
        @gnutls.library.types.gnutls_log_func
1866
 
        def debug_gnutls(level, string):
1867
 
            logger.debug("GnuTLS: %s", string[:-1])
1868
 
        
1869
 
        (gnutls.library.functions
1870
 
         .gnutls_global_set_log_function(debug_gnutls))
1871
 
        
1872
 
        # Redirect stdin so all checkers get /dev/null
1873
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1874
 
        os.dup2(null, sys.stdin.fileno())
1875
 
        if null > 2:
1876
 
            os.close(null)
1877
 
    else:
1878
 
        # No console logging
1879
 
        logger.removeHandler(console)
1880
 
    
1881
 
    # Need to fork before connecting to D-Bus
1882
 
    if not debug:
1883
 
        # Close all input and output, do double fork, etc.
1884
 
        daemon()
1885
 
    
1886
 
    global main_loop
1887
 
    # 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
1888
589
    DBusGMainLoop(set_as_default=True )
1889
590
    main_loop = gobject.MainLoop()
1890
591
    bus = dbus.SystemBus()
1891
 
    # End of Avahi example code
1892
 
    if use_dbus:
1893
 
        try:
1894
 
            bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1895
 
                                            bus, do_not_queue=True)
1896
 
        except dbus.exceptions.NameExistsException as e:
1897
 
            logger.error(unicode(e) + ", disabling D-Bus")
1898
 
            use_dbus = False
1899
 
            server_settings["use_dbus"] = False
1900
 
            tcp_server.use_dbus = False
1901
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1902
 
    service = AvahiService(name = server_settings["servicename"],
1903
 
                           servicetype = "_mandos._tcp",
1904
 
                           protocol = protocol, bus = bus)
1905
 
    if server_settings["interface"]:
1906
 
        service.interface = (if_nametoindex
1907
 
                             (str(server_settings["interface"])))
1908
 
    
1909
 
    global multiprocessing_manager
1910
 
    multiprocessing_manager = multiprocessing.Manager()
1911
 
    
1912
 
    client_class = Client
1913
 
    if use_dbus:
1914
 
        client_class = functools.partial(ClientDBus, bus = bus)
1915
 
    def client_config_items(config, section):
1916
 
        special_settings = {
1917
 
            "approved_by_default":
1918
 
                lambda: config.getboolean(section,
1919
 
                                          "approved_by_default"),
1920
 
            }
1921
 
        for name, value in config.items(section):
1922
 
            try:
1923
 
                yield (name, special_settings[name]())
1924
 
            except KeyError:
1925
 
                yield (name, value)
1926
 
    
1927
 
    tcp_server.clients.update(set(
1928
 
            client_class(name = section,
1929
 
                         config= dict(client_config_items(
1930
 
                        client_config, section)))
1931
 
            for section in client_config.sections()))
1932
 
    if not tcp_server.clients:
1933
 
        logger.warning("No clients defined")
1934
 
        
1935
 
    if not debug:
1936
 
        try:
1937
 
            with pidfile:
1938
 
                pid = os.getpid()
1939
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
1940
 
            del pidfile
1941
 
        except IOError:
1942
 
            logger.error("Could not write to file %r with PID %d",
1943
 
                         pidfilename, pid)
1944
 
        except NameError:
1945
 
            # "pidfile" was never created
1946
 
            pass
1947
 
        del pidfilename
1948
 
        
1949
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1950
 
 
1951
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1952
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1953
 
    
1954
 
    if use_dbus:
1955
 
        class MandosDBusService(dbus.service.Object):
1956
 
            """A D-Bus proxy object"""
1957
 
            def __init__(self):
1958
 
                dbus.service.Object.__init__(self, bus, "/")
1959
 
            _interface = "se.bsnet.fukt.Mandos"
1960
 
            
1961
 
            @dbus.service.signal(_interface, signature="o")
1962
 
            def ClientAdded(self, objpath):
1963
 
                "D-Bus signal"
1964
 
                pass
1965
 
            
1966
 
            @dbus.service.signal(_interface, signature="ss")
1967
 
            def ClientNotFound(self, fingerprint, address):
1968
 
                "D-Bus signal"
1969
 
                pass
1970
 
            
1971
 
            @dbus.service.signal(_interface, signature="os")
1972
 
            def ClientRemoved(self, objpath, name):
1973
 
                "D-Bus signal"
1974
 
                pass
1975
 
            
1976
 
            @dbus.service.method(_interface, out_signature="ao")
1977
 
            def GetAllClients(self):
1978
 
                "D-Bus method"
1979
 
                return dbus.Array(c.dbus_object_path
1980
 
                                  for c in tcp_server.clients)
1981
 
            
1982
 
            @dbus.service.method(_interface,
1983
 
                                 out_signature="a{oa{sv}}")
1984
 
            def GetAllClientsWithProperties(self):
1985
 
                "D-Bus method"
1986
 
                return dbus.Dictionary(
1987
 
                    ((c.dbus_object_path, c.GetAll(""))
1988
 
                     for c in tcp_server.clients),
1989
 
                    signature="oa{sv}")
1990
 
            
1991
 
            @dbus.service.method(_interface, in_signature="o")
1992
 
            def RemoveClient(self, object_path):
1993
 
                "D-Bus method"
1994
 
                for c in tcp_server.clients:
1995
 
                    if c.dbus_object_path == object_path:
1996
 
                        tcp_server.clients.remove(c)
1997
 
                        c.remove_from_connection()
1998
 
                        # Don't signal anything except ClientRemoved
1999
 
                        c.disable(quiet=True)
2000
 
                        # Emit D-Bus signal
2001
 
                        self.ClientRemoved(object_path, c.name)
2002
 
                        return
2003
 
                raise KeyError(object_path)
2004
 
            
2005
 
            del _interface
2006
 
        
2007
 
        mandos_dbus_service = MandosDBusService()
2008
 
    
2009
 
    def cleanup():
2010
 
        "Cleanup function; run on exit"
2011
 
        service.cleanup()
2012
 
        
2013
 
        while tcp_server.clients:
2014
 
            client = tcp_server.clients.pop()
2015
 
            if use_dbus:
2016
 
                client.remove_from_connection()
2017
 
            client.disable_hook = None
2018
 
            # Don't signal anything except ClientRemoved
2019
 
            client.disable(quiet=True)
2020
 
            if use_dbus:
2021
 
                # Emit D-Bus signal
2022
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
2023
 
                                                  client.name)
2024
 
    
2025
 
    atexit.register(cleanup)
2026
 
    
2027
 
    for client in tcp_server.clients:
2028
 
        if use_dbus:
2029
 
            # Emit D-Bus signal
2030
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2031
 
        client.enable()
2032
 
    
2033
 
    tcp_server.enable()
2034
 
    tcp_server.server_activate()
2035
 
    
2036
 
    # Find out what port we got
2037
 
    service.port = tcp_server.socket.getsockname()[1]
2038
 
    if use_ipv6:
2039
 
        logger.info("Now listening on address %r, port %d,"
2040
 
                    " flowinfo %d, scope_id %d"
2041
 
                    % tcp_server.socket.getsockname())
2042
 
    else:                       # IPv4
2043
 
        logger.info("Now listening on address %r, port %d"
2044
 
                    % tcp_server.socket.getsockname())
2045
 
    
2046
 
    #service.interface = tcp_server.socket.getsockname()[3]
2047
 
    
 
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)
2048
634
    try:
2049
 
        # From the Avahi example code
2050
 
        try:
2051
 
            service.activate()
2052
 
        except dbus.exceptions.DBusException as error:
2053
 
            logger.critical("DBusException: %s", error)
2054
 
            cleanup()
2055
 
            sys.exit(1)
2056
 
        # End of Avahi example code
2057
 
        
2058
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2059
 
                             lambda *args, **kwargs:
2060
 
                             (tcp_server.handle_request
2061
 
                              (*args[2:], **kwargs) or True))
2062
 
        
2063
 
        logger.debug("Starting main loop")
2064
635
        main_loop.run()
2065
 
    except AvahiError as error:
2066
 
        logger.critical("AvahiError: %s", error)
2067
 
        cleanup()
2068
 
        sys.exit(1)
2069
636
    except KeyboardInterrupt:
2070
 
        if debug:
2071
 
            print("", file=sys.stderr)
2072
 
        logger.debug("Server received KeyboardInterrupt")
2073
 
    logger.debug("Server exiting")
2074
 
    # Must run before the D-Bus bus name gets deregistered
2075
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
2076
640
 
2077
 
if __name__ == '__main__':
2078
 
    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()