/mandos/trunk

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

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#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
13
 
# Everything else is
14
 
# Copyright © 2008-2011 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
 
    def rename(self):
155
 
        """Derived from the Avahi example code"""
156
 
        if self.rename_count >= self.max_renames:
157
 
            logger.critical("No suitable Zeroconf service name found"
158
 
                            " after %i retries, exiting.",
159
 
                            self.rename_count)
160
 
            raise AvahiServiceError("Too many renames")
161
 
        self.name = unicode(self.server.GetAlternativeServiceName(self.name))
162
 
        logger.info("Changing Zeroconf service name to %r ...",
163
 
                    self.name)
164
 
        syslogger.setFormatter(logging.Formatter
165
 
                               ('Mandos (%s) [%%(process)d]:'
166
 
                                ' %%(levelname)s: %%(message)s'
167
 
                                % self.name))
168
 
        self.remove()
169
 
        try:
170
 
            self.add()
171
 
        except dbus.exceptions.DBusException, error:
172
 
            logger.critical("DBusException: %s", error)
173
 
            self.cleanup()
174
 
            os._exit(1)
175
 
        self.rename_count += 1
176
 
    def remove(self):
177
 
        """Derived from the Avahi example code"""
178
 
        if self.group is not None:
179
 
            self.group.Reset()
180
 
    def add(self):
181
 
        """Derived from the Avahi example code"""
182
 
        if self.group is None:
183
 
            self.group = dbus.Interface(
184
 
                self.bus.get_object(avahi.DBUS_NAME,
185
 
                                    self.server.EntryGroupNew()),
186
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
187
 
            self.group.connect_to_signal('StateChanged',
188
 
                                         self
189
 
                                         .entry_group_state_changed)
190
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
191
 
                     self.name, self.type)
192
 
        self.group.AddService(
193
 
            self.interface,
194
 
            self.protocol,
195
 
            dbus.UInt32(0),     # flags
196
 
            self.name, self.type,
197
 
            self.domain, self.host,
198
 
            dbus.UInt16(self.port),
199
 
            avahi.string_array_to_txt_array(self.TXT))
200
 
        self.group.Commit()
201
 
    def entry_group_state_changed(self, state, error):
202
 
        """Derived from the Avahi example code"""
203
 
        logger.debug("Avahi entry group state change: %i", state)
204
 
        
205
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
206
 
            logger.debug("Zeroconf service established.")
207
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
208
 
            logger.info("Zeroconf service name collision.")
209
 
            self.rename()
210
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
211
 
            logger.critical("Avahi: Error in group state changed %s",
212
 
                            unicode(error))
213
 
            raise AvahiGroupError("State changed: %s"
214
 
                                  % unicode(error))
215
 
    def cleanup(self):
216
 
        """Derived from the Avahi example code"""
217
 
        if self.group is not None:
218
 
            self.group.Free()
219
 
            self.group = None
220
 
    def server_state_changed(self, state):
221
 
        """Derived from the Avahi example code"""
222
 
        logger.debug("Avahi server state change: %i", state)
223
 
        if state == avahi.SERVER_COLLISION:
224
 
            logger.error("Zeroconf server name collision")
225
 
            self.remove()
226
 
        elif state == avahi.SERVER_RUNNING:
227
 
            self.add()
228
 
    def activate(self):
229
 
        """Derived from the Avahi example code"""
230
 
        if self.server is None:
231
 
            self.server = dbus.Interface(
232
 
                self.bus.get_object(avahi.DBUS_NAME,
233
 
                                    avahi.DBUS_PATH_SERVER),
234
 
                avahi.DBUS_INTERFACE_SERVER)
235
 
        self.server.connect_to_signal("StateChanged",
236
 
                                 self.server_state_changed)
237
 
        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
238
54
 
239
55
 
240
56
class Client(object):
241
57
    """A representation of a client host served by this server.
242
 
    
243
58
    Attributes:
244
 
    _approved:   bool(); 'None' if not yet approved/disapproved
245
 
    approval_delay: datetime.timedelta(); Time to wait for approval
246
 
    approval_duration: datetime.timedelta(); Duration of one approval
247
 
    checker:    subprocess.Popen(); a running checker process used
248
 
                                    to see if the client lives.
249
 
                                    'None' if no process is running.
250
 
    checker_callback_tag: a gobject event source tag, or None
251
 
    checker_command: string; External command which is run to check
252
 
                     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
253
78
                     runtime with vars(self) as dict, so that for
254
79
                     instance %(name)s can be used in the command.
255
 
    checker_initiator_tag: a gobject event source tag, or None
256
 
    created:    datetime.datetime(); (UTC) object creation
257
 
    current_checker_command: string; current running checker_command
258
 
    disable_hook:  If set, called by disable() as disable_hook(self)
259
 
    disable_initiator_tag: a gobject event source tag, or None
260
 
    enabled:    bool()
261
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
262
 
                 uniquely identify the client
263
 
    host:       string; available for use by the checker command
264
 
    interval:   datetime.timedelta(); How often to start a new checker
265
 
    last_approval_request: datetime.datetime(); (UTC) or None
266
 
    last_checked_ok: datetime.datetime(); (UTC) or None
267
 
    last_enabled: datetime.datetime(); (UTC)
268
 
    name:       string; from the config file, used in log messages and
269
 
                        D-Bus identifiers
270
 
    secret:     bytestring; sent verbatim (over TLS) to client
271
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
272
 
                                      until this client is disabled
273
 
    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: - '' -
274
85
    """
275
 
    
276
 
    runtime_expansions = ("approval_delay", "approval_duration",
277
 
                          "created", "enabled", "fingerprint",
278
 
                          "host", "interval", "last_checked_ok",
279
 
                          "last_enabled", "name", "timeout")
280
 
    
281
 
    @staticmethod
282
 
    def _timedelta_to_milliseconds(td):
283
 
        "Convert a datetime.timedelta() to milliseconds"
284
 
        return ((td.days * 24 * 60 * 60 * 1000)
285
 
                + (td.seconds * 1000)
286
 
                + (td.microseconds // 1000))
287
 
    
288
 
    def timeout_milliseconds(self):
289
 
        "Return the 'timeout' attribute in milliseconds"
290
 
        return self._timedelta_to_milliseconds(self.timeout)
291
 
    
292
 
    def interval_milliseconds(self):
293
 
        "Return the 'interval' attribute in milliseconds"
294
 
        return self._timedelta_to_milliseconds(self.interval)
295
 
 
296
 
    def approval_delay_milliseconds(self):
297
 
        return self._timedelta_to_milliseconds(self.approval_delay)
298
 
    
299
 
    def __init__(self, name = None, disable_hook=None, config=None):
300
 
        """Note: the 'checker' key in 'config' sets the
301
 
        'checker_command' attribute and *not* the 'checker'
302
 
        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):
303
112
        self.name = name
304
 
        if config is None:
305
 
            config = {}
306
 
        logger.debug("Creating client %r", self.name)
307
 
        # Uppercase and remove spaces from fingerprint for later
308
 
        # comparison purposes with return value from the fingerprint()
309
 
        # function
310
 
        self.fingerprint = (config["fingerprint"].upper()
311
 
                            .replace(" ", ""))
312
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
313
 
        if "secret" in config:
314
 
            self.secret = config["secret"].decode("base64")
315
 
        elif "secfile" in config:
316
 
            with open(os.path.expanduser(os.path.expandvars
317
 
                                         (config["secfile"])),
318
 
                      "rb") as secfile:
319
 
                self.secret = secfile.read()
320
 
        else:
321
 
            raise TypeError("No secret or secfile for client %s"
322
 
                            % self.name)
323
 
        self.host = config.get("host", "")
324
 
        self.created = datetime.datetime.utcnow()
325
 
        self.enabled = False
326
 
        self.last_approval_request = None
327
 
        self.last_enabled = None
328
 
        self.last_checked_ok = None
329
 
        self.timeout = string_to_delta(config["timeout"])
330
 
        self.interval = string_to_delta(config["interval"])
331
 
        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
332
138
        self.checker = None
333
139
        self.checker_initiator_tag = None
334
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
335
141
        self.checker_callback_tag = None
336
 
        self.checker_command = config["checker"]
337
 
        self.current_checker_command = None
338
 
        self.last_connect = None
339
 
        self._approved = None
340
 
        self.approved_by_default = config.get("approved_by_default",
341
 
                                              True)
342
 
        self.approvals_pending = 0
343
 
        self.approval_delay = string_to_delta(
344
 
            config["approval_delay"])
345
 
        self.approval_duration = string_to_delta(
346
 
            config["approval_duration"])
347
 
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
348
 
    
349
 
    def send_changedstate(self):
350
 
        self.changedstate.acquire()
351
 
        self.changedstate.notify_all()
352
 
        self.changedstate.release()
353
 
        
354
 
    def enable(self):
355
 
        """Start this client's checker and timeout hooks"""
356
 
        if getattr(self, "enabled", False):
357
 
            # Already enabled
358
 
            return
359
 
        self.send_changedstate()
360
 
        self.last_enabled = datetime.datetime.utcnow()
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
361
145
        # Schedule a new checker to be started an 'interval' from now,
362
146
        # and every interval from then on.
363
 
        self.checker_initiator_tag = (gobject.timeout_add
364
 
                                      (self.interval_milliseconds(),
365
 
                                       self.start_checker))
366
 
        # Schedule a disable() when 'timeout' has passed
367
 
        self.disable_initiator_tag = (gobject.timeout_add
368
 
                                   (self.timeout_milliseconds(),
369
 
                                    self.disable))
370
 
        self.enabled = True
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
371
150
        # Also start a new checker *right now*.
372
151
        self.start_checker()
373
 
    
374
 
    def disable(self, quiet=True):
375
 
        """Disable this client."""
376
 
        if not getattr(self, "enabled", False):
377
 
            return False
378
 
        if not quiet:
379
 
            self.send_changedstate()
380
 
        if not quiet:
381
 
            logger.info("Disabling client %s", self.name)
382
 
        if getattr(self, "disable_initiator_tag", False):
383
 
            gobject.source_remove(self.disable_initiator_tag)
384
 
            self.disable_initiator_tag = None
385
 
        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:
386
166
            gobject.source_remove(self.checker_initiator_tag)
387
167
            self.checker_initiator_tag = None
388
168
        self.stop_checker()
389
 
        if self.disable_hook:
390
 
            self.disable_hook(self)
391
 
        self.enabled = False
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
392
171
        # Do not run this again if called by a gobject.timeout_add
393
172
        return False
394
 
    
395
173
    def __del__(self):
396
 
        self.disable_hook = None
397
 
        self.disable()
398
 
    
399
 
    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):
400
185
        """The checker has completed, so take appropriate actions."""
401
 
        self.checker_callback_tag = None
402
 
        self.checker = None
403
 
        if os.WIFEXITED(condition):
404
 
            exitstatus = os.WEXITSTATUS(condition)
405
 
            if exitstatus == 0:
406
 
                logger.info("Checker for %(name)s succeeded",
407
 
                            vars(self))
408
 
                self.checked_ok()
409
 
            else:
410
 
                logger.info("Checker for %(name)s failed",
411
 
                            vars(self))
412
 
        else:
413
 
            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?",
414
198
                           vars(self))
415
 
    
416
 
    def checked_ok(self):
417
 
        """Bump up the timeout for this client.
418
 
        
419
 
        This should only be called when the client has been seen,
420
 
        alive and well.
421
 
        """
422
 
        self.last_checked_ok = datetime.datetime.utcnow()
423
 
        gobject.source_remove(self.disable_initiator_tag)
424
 
        self.disable_initiator_tag = (gobject.timeout_add
425
 
                                      (self.timeout_milliseconds(),
426
 
                                       self.disable))
427
 
    
428
 
    def need_approval(self):
429
 
        self.last_approval_request = datetime.datetime.utcnow()
430
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
431
204
    def start_checker(self):
432
205
        """Start a new checker subprocess if one is not running.
433
 
        
434
206
        If a checker already exists, leave it running and do
435
207
        nothing."""
436
 
        # The reason for not killing a running checker is that if we
437
 
        # did that, then if a checker (for some reason) started
438
 
        # running slowly and taking more than 'interval' time, the
439
 
        # client would inevitably timeout, since no checker would get
440
 
        # a chance to run to completion.  If we instead leave running
441
 
        # checkers alone, the checker would have to take more time
442
 
        # than 'timeout' for the client to be disabled, which is as it
443
 
        # should be.
444
 
        
445
 
        # If a checker exists, make sure it is not a zombie
446
 
        try:
447
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
448
 
        except (AttributeError, OSError), error:
449
 
            if (isinstance(error, OSError)
450
 
                and error.errno != errno.ECHILD):
451
 
                raise error
452
 
        else:
453
 
            if pid:
454
 
                logger.warning("Checker was a zombie")
455
 
                gobject.source_remove(self.checker_callback_tag)
456
 
                self.checker_callback(pid, status,
457
 
                                      self.current_checker_command)
458
 
        # Start a new checker if needed
459
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
460
211
            try:
461
 
                # In case checker_command has exactly one % operator
462
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
463
213
            except TypeError:
464
 
                # Escape attributes for the shell
465
 
                escaped_attrs = dict(
466
 
                    (attr,
467
 
                     re.escape(unicode(str(getattr(self, attr, "")),
468
 
                                       errors=
469
 
                                       'replace')))
470
 
                    for attr in
471
 
                    self.runtime_expansions)
472
 
 
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
473
217
                try:
474
 
                    command = self.checker_command % escaped_attrs
 
218
                    command = self.check_command % escaped_attrs
475
219
                except TypeError, error:
476
 
                    logger.error('Could not format string "%s":'
477
 
                                 ' %s', self.checker_command, error)
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
478
222
                    return True # Try again later
479
 
            self.current_checker_command = command
480
223
            try:
481
 
                logger.info("Starting checker %r for %s",
482
 
                            command, self.name)
483
 
                # We don't need to redirect stdout and stderr, since
484
 
                # in normal mode, that is already done by daemon(),
485
 
                # and in debug mode we don't want to.  (Stdin is
486
 
                # always replaced by /dev/null.)
487
 
                self.checker = subprocess.Popen(command,
488
 
                                                close_fds=True,
489
 
                                                shell=True, cwd="/")
490
 
                self.checker_callback_tag = (gobject.child_watch_add
491
 
                                             (self.checker.pid,
492
 
                                              self.checker_callback,
493
 
                                              data=command))
494
 
                # The checker may have completed before the gobject
495
 
                # watch was added.  Check for this.
496
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
497
 
                if pid:
498
 
                    gobject.source_remove(self.checker_callback_tag)
499
 
                    self.checker_callback(pid, status, command)
500
 
            except OSError, error:
501
 
                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",
502
235
                             error)
503
236
        # Re-run this periodically if run by gobject.timeout_add
504
237
        return True
505
 
    
506
238
    def stop_checker(self):
507
239
        """Force the checker process, if any, to stop."""
508
 
        if self.checker_callback_tag:
509
 
            gobject.source_remove(self.checker_callback_tag)
510
 
            self.checker_callback_tag = None
511
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
512
241
            return
513
 
        logger.debug("Stopping checker for %(name)s", vars(self))
514
 
        try:
515
 
            os.kill(self.checker.pid, signal.SIGTERM)
516
 
            #time.sleep(0.5)
517
 
            #if self.checker.poll() is None:
518
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
519
 
        except OSError, error:
520
 
            if error.errno != errno.ESRCH: # No such process
521
 
                raise
522
 
        self.checker = None
523
 
 
524
 
def dbus_service_property(dbus_interface, signature="v",
525
 
                          access="readwrite", byte_arrays=False):
526
 
    """Decorators for marking methods of a DBusObjectWithProperties to
527
 
    become properties on the D-Bus.
528
 
    
529
 
    The decorated method will be called with no arguments by "Get"
530
 
    and with one argument by "Set".
531
 
    
532
 
    The parameters, where they are supported, are the same as
533
 
    dbus.service.method, except there is only "signature", since the
534
 
    type from Get() and the type sent to Set() is the same.
535
 
    """
536
 
    # Encoding deeply encoded byte arrays is not supported yet by the
537
 
    # "Set" method, so we fail early here:
538
 
    if byte_arrays and signature != "ay":
539
 
        raise ValueError("Byte arrays not supported for non-'ay'"
540
 
                         " signature %r" % signature)
541
 
    def decorator(func):
542
 
        func._dbus_is_property = True
543
 
        func._dbus_interface = dbus_interface
544
 
        func._dbus_signature = signature
545
 
        func._dbus_access = access
546
 
        func._dbus_name = func.__name__
547
 
        if func._dbus_name.endswith("_dbus_property"):
548
 
            func._dbus_name = func._dbus_name[:-14]
549
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
550
 
        return func
551
 
    return decorator
552
 
 
553
 
 
554
 
class DBusPropertyException(dbus.exceptions.DBusException):
555
 
    """A base class for D-Bus property-related exceptions
556
 
    """
557
 
    def __unicode__(self):
558
 
        return unicode(str(self))
559
 
 
560
 
 
561
 
class DBusPropertyAccessException(DBusPropertyException):
562
 
    """A property's access permissions disallows an operation.
563
 
    """
564
 
    pass
565
 
 
566
 
 
567
 
class DBusPropertyNotFound(DBusPropertyException):
568
 
    """An attempt was made to access a non-existing property.
569
 
    """
570
 
    pass
571
 
 
572
 
 
573
 
class DBusObjectWithProperties(dbus.service.Object):
574
 
    """A D-Bus object with properties.
575
 
 
576
 
    Classes inheriting from this can use the dbus_service_property
577
 
    decorator to expose methods as D-Bus properties.  It exposes the
578
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
579
 
    """
580
 
    
581
 
    @staticmethod
582
 
    def _is_dbus_property(obj):
583
 
        return getattr(obj, "_dbus_is_property", False)
584
 
    
585
 
    def _get_all_dbus_properties(self):
586
 
        """Returns a generator of (name, attribute) pairs
587
 
        """
588
 
        return ((prop._dbus_name, prop)
589
 
                for name, prop in
590
 
                inspect.getmembers(self, self._is_dbus_property))
591
 
    
592
 
    def _get_dbus_property(self, interface_name, property_name):
593
 
        """Returns a bound method if one exists which is a D-Bus
594
 
        property with the specified name and interface.
595
 
        """
596
 
        for name in (property_name,
597
 
                     property_name + "_dbus_property"):
598
 
            prop = getattr(self, name, None)
599
 
            if (prop is None
600
 
                or not self._is_dbus_property(prop)
601
 
                or prop._dbus_name != property_name
602
 
                or (interface_name and prop._dbus_interface
603
 
                    and interface_name != prop._dbus_interface)):
604
 
                continue
605
 
            return prop
606
 
        # No such property
607
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
608
 
                                   + interface_name + "."
609
 
                                   + property_name)
610
 
    
611
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
612
 
                         out_signature="v")
613
 
    def Get(self, interface_name, property_name):
614
 
        """Standard D-Bus property Get() method, see D-Bus standard.
615
 
        """
616
 
        prop = self._get_dbus_property(interface_name, property_name)
617
 
        if prop._dbus_access == "write":
618
 
            raise DBusPropertyAccessException(property_name)
619
 
        value = prop()
620
 
        if not hasattr(value, "variant_level"):
621
 
            return value
622
 
        return type(value)(value, variant_level=value.variant_level+1)
623
 
    
624
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
625
 
    def Set(self, interface_name, property_name, value):
626
 
        """Standard D-Bus property Set() method, see D-Bus standard.
627
 
        """
628
 
        prop = self._get_dbus_property(interface_name, property_name)
629
 
        if prop._dbus_access == "read":
630
 
            raise DBusPropertyAccessException(property_name)
631
 
        if prop._dbus_get_args_options["byte_arrays"]:
632
 
            # The byte_arrays option is not supported yet on
633
 
            # signatures other than "ay".
634
 
            if prop._dbus_signature != "ay":
635
 
                raise ValueError
636
 
            value = dbus.ByteArray(''.join(unichr(byte)
637
 
                                           for byte in value))
638
 
        prop(value)
639
 
    
640
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
641
 
                         out_signature="a{sv}")
642
 
    def GetAll(self, interface_name):
643
 
        """Standard D-Bus property GetAll() method, see D-Bus
644
 
        standard.
645
 
 
646
 
        Note: Will not include properties with access="write".
647
 
        """
648
 
        all = {}
649
 
        for name, prop in self._get_all_dbus_properties():
650
 
            if (interface_name
651
 
                and interface_name != prop._dbus_interface):
652
 
                # Interface non-empty but did not match
653
 
                continue
654
 
            # Ignore write-only properties
655
 
            if prop._dbus_access == "write":
656
 
                continue
657
 
            value = prop()
658
 
            if not hasattr(value, "variant_level"):
659
 
                all[name] = value
660
 
                continue
661
 
            all[name] = type(value)(value, variant_level=
662
 
                                    value.variant_level+1)
663
 
        return dbus.Dictionary(all, signature="sv")
664
 
    
665
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
666
 
                         out_signature="s",
667
 
                         path_keyword='object_path',
668
 
                         connection_keyword='connection')
669
 
    def Introspect(self, object_path, connection):
670
 
        """Standard D-Bus method, overloaded to insert property tags.
671
 
        """
672
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
673
 
                                                   connection)
674
 
        try:
675
 
            document = xml.dom.minidom.parseString(xmlstring)
676
 
            def make_tag(document, name, prop):
677
 
                e = document.createElement("property")
678
 
                e.setAttribute("name", name)
679
 
                e.setAttribute("type", prop._dbus_signature)
680
 
                e.setAttribute("access", prop._dbus_access)
681
 
                return e
682
 
            for if_tag in document.getElementsByTagName("interface"):
683
 
                for tag in (make_tag(document, name, prop)
684
 
                            for name, prop
685
 
                            in self._get_all_dbus_properties()
686
 
                            if prop._dbus_interface
687
 
                            == if_tag.getAttribute("name")):
688
 
                    if_tag.appendChild(tag)
689
 
                # Add the names to the return values for the
690
 
                # "org.freedesktop.DBus.Properties" methods
691
 
                if (if_tag.getAttribute("name")
692
 
                    == "org.freedesktop.DBus.Properties"):
693
 
                    for cn in if_tag.getElementsByTagName("method"):
694
 
                        if cn.getAttribute("name") == "Get":
695
 
                            for arg in cn.getElementsByTagName("arg"):
696
 
                                if (arg.getAttribute("direction")
697
 
                                    == "out"):
698
 
                                    arg.setAttribute("name", "value")
699
 
                        elif cn.getAttribute("name") == "GetAll":
700
 
                            for arg in cn.getElementsByTagName("arg"):
701
 
                                if (arg.getAttribute("direction")
702
 
                                    == "out"):
703
 
                                    arg.setAttribute("name", "props")
704
 
            xmlstring = document.toxml("utf-8")
705
 
            document.unlink()
706
 
        except (AttributeError, xml.dom.DOMException,
707
 
                xml.parsers.expat.ExpatError), error:
708
 
            logger.error("Failed to override Introspection method",
709
 
                         error)
710
 
        return xmlstring
711
 
 
712
 
 
713
 
class ClientDBus(Client, DBusObjectWithProperties):
714
 
    """A Client class using D-Bus
715
 
    
716
 
    Attributes:
717
 
    dbus_object_path: dbus.ObjectPath
718
 
    bus: dbus.SystemBus()
719
 
    """
720
 
    
721
 
    runtime_expansions = (Client.runtime_expansions
722
 
                          + ("dbus_object_path",))
723
 
    
724
 
    # dbus.service.Object doesn't use super(), so we can't either.
725
 
    
726
 
    def __init__(self, bus = None, *args, **kwargs):
727
 
        self._approvals_pending = 0
728
 
        self.bus = bus
729
 
        Client.__init__(self, *args, **kwargs)
730
 
        # Only now, when this client is initialized, can it show up on
731
 
        # the D-Bus
732
 
        client_object_name = unicode(self.name).translate(
733
 
            {ord("."): ord("_"),
734
 
             ord("-"): ord("_")})
735
 
        self.dbus_object_path = (dbus.ObjectPath
736
 
                                 ("/clients/" + client_object_name))
737
 
        DBusObjectWithProperties.__init__(self, self.bus,
738
 
                                          self.dbus_object_path)
739
 
        
740
 
    def _get_approvals_pending(self):
741
 
        return self._approvals_pending
742
 
    def _set_approvals_pending(self, value):
743
 
        old_value = self._approvals_pending
744
 
        self._approvals_pending = value
745
 
        bval = bool(value)
746
 
        if (hasattr(self, "dbus_object_path")
747
 
            and bval is not bool(old_value)):
748
 
            dbus_bool = dbus.Boolean(bval, variant_level=1)
749
 
            self.PropertyChanged(dbus.String("ApprovalPending"),
750
 
                                 dbus_bool)
751
 
 
752
 
    approvals_pending = property(_get_approvals_pending,
753
 
                                 _set_approvals_pending)
754
 
    del _get_approvals_pending, _set_approvals_pending
755
 
    
756
 
    @staticmethod
757
 
    def _datetime_to_dbus(dt, variant_level=0):
758
 
        """Convert a UTC datetime.datetime() to a D-Bus type."""
759
 
        return dbus.String(dt.isoformat(),
760
 
                           variant_level=variant_level)
761
 
    
762
 
    def enable(self):
763
 
        oldstate = getattr(self, "enabled", False)
764
 
        r = Client.enable(self)
765
 
        if oldstate != self.enabled:
766
 
            # Emit D-Bus signals
767
 
            self.PropertyChanged(dbus.String("Enabled"),
768
 
                                 dbus.Boolean(True, variant_level=1))
769
 
            self.PropertyChanged(
770
 
                dbus.String("LastEnabled"),
771
 
                self._datetime_to_dbus(self.last_enabled,
772
 
                                       variant_level=1))
773
 
        return r
774
 
    
775
 
    def disable(self, quiet = False):
776
 
        oldstate = getattr(self, "enabled", False)
777
 
        r = Client.disable(self, quiet=quiet)
778
 
        if not quiet and oldstate != self.enabled:
779
 
            # Emit D-Bus signal
780
 
            self.PropertyChanged(dbus.String("Enabled"),
781
 
                                 dbus.Boolean(False, variant_level=1))
782
 
        return r
783
 
    
784
 
    def __del__(self, *args, **kwargs):
785
 
        try:
786
 
            self.remove_from_connection()
787
 
        except LookupError:
788
 
            pass
789
 
        if hasattr(DBusObjectWithProperties, "__del__"):
790
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
791
 
        Client.__del__(self, *args, **kwargs)
792
 
    
793
 
    def checker_callback(self, pid, condition, command,
794
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
795
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)
796
247
        self.checker = None
797
 
        # Emit D-Bus signal
798
 
        self.PropertyChanged(dbus.String("CheckerRunning"),
799
 
                             dbus.Boolean(False, variant_level=1))
800
 
        if os.WIFEXITED(condition):
801
 
            exitstatus = os.WEXITSTATUS(condition)
802
 
            # Emit D-Bus signal
803
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
804
 
                                  dbus.Int64(condition),
805
 
                                  dbus.String(command))
806
 
        else:
807
 
            # Emit D-Bus signal
808
 
            self.CheckerCompleted(dbus.Int16(-1),
809
 
                                  dbus.Int64(condition),
810
 
                                  dbus.String(command))
811
 
        
812
 
        return Client.checker_callback(self, pid, condition, command,
813
 
                                       *args, **kwargs)
814
 
    
815
 
    def checked_ok(self, *args, **kwargs):
816
 
        r = Client.checked_ok(self, *args, **kwargs)
817
 
        # Emit D-Bus signal
818
 
        self.PropertyChanged(
819
 
            dbus.String("LastCheckedOK"),
820
 
            (self._datetime_to_dbus(self.last_checked_ok,
821
 
                                    variant_level=1)))
822
 
        return r
823
 
    
824
 
    def need_approval(self, *args, **kwargs):
825
 
        r = Client.need_approval(self, *args, **kwargs)
826
 
        # Emit D-Bus signal
827
 
        self.PropertyChanged(
828
 
            dbus.String("LastApprovalRequest"),
829
 
            (self._datetime_to_dbus(self.last_approval_request,
830
 
                                    variant_level=1)))
831
 
        return r
832
 
    
833
 
    def start_checker(self, *args, **kwargs):
834
 
        old_checker = self.checker
835
 
        if self.checker is not None:
836
 
            old_checker_pid = self.checker.pid
837
 
        else:
838
 
            old_checker_pid = None
839
 
        r = Client.start_checker(self, *args, **kwargs)
840
 
        # Only if new checker process was started
841
 
        if (self.checker is not None
842
 
            and old_checker_pid != self.checker.pid):
843
 
            # Emit D-Bus signal
844
 
            self.CheckerStarted(self.current_checker_command)
845
 
            self.PropertyChanged(
846
 
                dbus.String("CheckerRunning"),
847
 
                dbus.Boolean(True, variant_level=1))
848
 
        return r
849
 
    
850
 
    def stop_checker(self, *args, **kwargs):
851
 
        old_checker = getattr(self, "checker", None)
852
 
        r = Client.stop_checker(self, *args, **kwargs)
853
 
        if (old_checker is not None
854
 
            and getattr(self, "checker", None) is None):
855
 
            self.PropertyChanged(dbus.String("CheckerRunning"),
856
 
                                 dbus.Boolean(False, variant_level=1))
857
 
        return r
858
 
 
859
 
    def _reset_approved(self):
860
 
        self._approved = None
861
 
        return False
862
 
    
863
 
    def approve(self, value=True):
864
 
        self.send_changedstate()
865
 
        self._approved = value
866
 
        gobject.timeout_add(self._timedelta_to_milliseconds
867
 
                            (self.approval_duration),
868
 
                            self._reset_approved)
869
 
    
870
 
    
871
 
    ## D-Bus methods, signals & properties
872
 
    _interface = "se.bsnet.fukt.Mandos.Client"
873
 
    
874
 
    ## Signals
875
 
    
876
 
    # CheckerCompleted - signal
877
 
    @dbus.service.signal(_interface, signature="nxs")
878
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
879
 
        "D-Bus signal"
880
 
        pass
881
 
    
882
 
    # CheckerStarted - signal
883
 
    @dbus.service.signal(_interface, signature="s")
884
 
    def CheckerStarted(self, command):
885
 
        "D-Bus signal"
886
 
        pass
887
 
    
888
 
    # PropertyChanged - signal
889
 
    @dbus.service.signal(_interface, signature="sv")
890
 
    def PropertyChanged(self, property, value):
891
 
        "D-Bus signal"
892
 
        pass
893
 
    
894
 
    # GotSecret - signal
895
 
    @dbus.service.signal(_interface)
896
 
    def GotSecret(self):
897
 
        """D-Bus signal
898
 
        Is sent after a successful transfer of secret from the Mandos
899
 
        server to mandos-client
900
 
        """
901
 
        pass
902
 
    
903
 
    # Rejected - signal
904
 
    @dbus.service.signal(_interface, signature="s")
905
 
    def Rejected(self, reason):
906
 
        "D-Bus signal"
907
 
        pass
908
 
    
909
 
    # NeedApproval - signal
910
 
    @dbus.service.signal(_interface, signature="tb")
911
 
    def NeedApproval(self, timeout, default):
912
 
        "D-Bus signal"
913
 
        return self.need_approval()
914
 
    
915
 
    ## Methods
916
 
    
917
 
    # Approve - method
918
 
    @dbus.service.method(_interface, in_signature="b")
919
 
    def Approve(self, value):
920
 
        self.approve(value)
921
 
    
922
 
    # CheckedOK - method
923
 
    @dbus.service.method(_interface)
924
 
    def CheckedOK(self):
925
 
        return self.checked_ok()
926
 
    
927
 
    # Enable - method
928
 
    @dbus.service.method(_interface)
929
 
    def Enable(self):
930
 
        "D-Bus method"
931
 
        self.enable()
932
 
    
933
 
    # StartChecker - method
934
 
    @dbus.service.method(_interface)
935
 
    def StartChecker(self):
936
 
        "D-Bus method"
937
 
        self.start_checker()
938
 
    
939
 
    # Disable - method
940
 
    @dbus.service.method(_interface)
941
 
    def Disable(self):
942
 
        "D-Bus method"
943
 
        self.disable()
944
 
    
945
 
    # StopChecker - method
946
 
    @dbus.service.method(_interface)
947
 
    def StopChecker(self):
948
 
        self.stop_checker()
949
 
    
950
 
    ## Properties
951
 
    
952
 
    # ApprovalPending - property
953
 
    @dbus_service_property(_interface, signature="b", access="read")
954
 
    def ApprovalPending_dbus_property(self):
955
 
        return dbus.Boolean(bool(self.approvals_pending))
956
 
    
957
 
    # ApprovedByDefault - property
958
 
    @dbus_service_property(_interface, signature="b",
959
 
                           access="readwrite")
960
 
    def ApprovedByDefault_dbus_property(self, value=None):
961
 
        if value is None:       # get
962
 
            return dbus.Boolean(self.approved_by_default)
963
 
        self.approved_by_default = bool(value)
964
 
        # Emit D-Bus signal
965
 
        self.PropertyChanged(dbus.String("ApprovedByDefault"),
966
 
                             dbus.Boolean(value, variant_level=1))
967
 
    
968
 
    # ApprovalDelay - property
969
 
    @dbus_service_property(_interface, signature="t",
970
 
                           access="readwrite")
971
 
    def ApprovalDelay_dbus_property(self, value=None):
972
 
        if value is None:       # get
973
 
            return dbus.UInt64(self.approval_delay_milliseconds())
974
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
975
 
        # Emit D-Bus signal
976
 
        self.PropertyChanged(dbus.String("ApprovalDelay"),
977
 
                             dbus.UInt64(value, variant_level=1))
978
 
    
979
 
    # ApprovalDuration - property
980
 
    @dbus_service_property(_interface, signature="t",
981
 
                           access="readwrite")
982
 
    def ApprovalDuration_dbus_property(self, value=None):
983
 
        if value is None:       # get
984
 
            return dbus.UInt64(self._timedelta_to_milliseconds(
985
 
                    self.approval_duration))
986
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
987
 
        # Emit D-Bus signal
988
 
        self.PropertyChanged(dbus.String("ApprovalDuration"),
989
 
                             dbus.UInt64(value, variant_level=1))
990
 
    
991
 
    # Name - property
992
 
    @dbus_service_property(_interface, signature="s", access="read")
993
 
    def Name_dbus_property(self):
994
 
        return dbus.String(self.name)
995
 
    
996
 
    # Fingerprint - property
997
 
    @dbus_service_property(_interface, signature="s", access="read")
998
 
    def Fingerprint_dbus_property(self):
999
 
        return dbus.String(self.fingerprint)
1000
 
    
1001
 
    # Host - property
1002
 
    @dbus_service_property(_interface, signature="s",
1003
 
                           access="readwrite")
1004
 
    def Host_dbus_property(self, value=None):
1005
 
        if value is None:       # get
1006
 
            return dbus.String(self.host)
1007
 
        self.host = value
1008
 
        # Emit D-Bus signal
1009
 
        self.PropertyChanged(dbus.String("Host"),
1010
 
                             dbus.String(value, variant_level=1))
1011
 
    
1012
 
    # Created - property
1013
 
    @dbus_service_property(_interface, signature="s", access="read")
1014
 
    def Created_dbus_property(self):
1015
 
        return dbus.String(self._datetime_to_dbus(self.created))
1016
 
    
1017
 
    # LastEnabled - property
1018
 
    @dbus_service_property(_interface, signature="s", access="read")
1019
 
    def LastEnabled_dbus_property(self):
1020
 
        if self.last_enabled is None:
1021
 
            return dbus.String("")
1022
 
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
1023
 
    
1024
 
    # Enabled - property
1025
 
    @dbus_service_property(_interface, signature="b",
1026
 
                           access="readwrite")
1027
 
    def Enabled_dbus_property(self, value=None):
1028
 
        if value is None:       # get
1029
 
            return dbus.Boolean(self.enabled)
1030
 
        if value:
1031
 
            self.enable()
1032
 
        else:
1033
 
            self.disable()
1034
 
    
1035
 
    # LastCheckedOK - property
1036
 
    @dbus_service_property(_interface, signature="s",
1037
 
                           access="readwrite")
1038
 
    def LastCheckedOK_dbus_property(self, value=None):
1039
 
        if value is not None:
1040
 
            self.checked_ok()
1041
 
            return
1042
 
        if self.last_checked_ok is None:
1043
 
            return dbus.String("")
1044
 
        return dbus.String(self._datetime_to_dbus(self
1045
 
                                                  .last_checked_ok))
1046
 
    
1047
 
    # LastApprovalRequest - property
1048
 
    @dbus_service_property(_interface, signature="s", access="read")
1049
 
    def LastApprovalRequest_dbus_property(self):
1050
 
        if self.last_approval_request is None:
1051
 
            return dbus.String("")
1052
 
        return dbus.String(self.
1053
 
                           _datetime_to_dbus(self
1054
 
                                             .last_approval_request))
1055
 
    
1056
 
    # Timeout - property
1057
 
    @dbus_service_property(_interface, signature="t",
1058
 
                           access="readwrite")
1059
 
    def Timeout_dbus_property(self, value=None):
1060
 
        if value is None:       # get
1061
 
            return dbus.UInt64(self.timeout_milliseconds())
1062
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1063
 
        # Emit D-Bus signal
1064
 
        self.PropertyChanged(dbus.String("Timeout"),
1065
 
                             dbus.UInt64(value, variant_level=1))
1066
 
        if getattr(self, "disable_initiator_tag", None) is None:
1067
 
            return
1068
 
        # Reschedule timeout
1069
 
        gobject.source_remove(self.disable_initiator_tag)
1070
 
        self.disable_initiator_tag = None
1071
 
        time_to_die = (self.
1072
 
                       _timedelta_to_milliseconds((self
1073
 
                                                   .last_checked_ok
1074
 
                                                   + self.timeout)
1075
 
                                                  - datetime.datetime
1076
 
                                                  .utcnow()))
1077
 
        if time_to_die <= 0:
1078
 
            # The timeout has passed
1079
 
            self.disable()
1080
 
        else:
1081
 
            self.disable_initiator_tag = (gobject.timeout_add
1082
 
                                          (time_to_die, self.disable))
1083
 
    
1084
 
    # Interval - property
1085
 
    @dbus_service_property(_interface, signature="t",
1086
 
                           access="readwrite")
1087
 
    def Interval_dbus_property(self, value=None):
1088
 
        if value is None:       # get
1089
 
            return dbus.UInt64(self.interval_milliseconds())
1090
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1091
 
        # Emit D-Bus signal
1092
 
        self.PropertyChanged(dbus.String("Interval"),
1093
 
                             dbus.UInt64(value, variant_level=1))
1094
 
        if getattr(self, "checker_initiator_tag", None) is None:
1095
 
            return
1096
 
        # Reschedule checker run
1097
 
        gobject.source_remove(self.checker_initiator_tag)
1098
 
        self.checker_initiator_tag = (gobject.timeout_add
1099
 
                                      (value, self.start_checker))
1100
 
        self.start_checker()    # Start one now, too
1101
 
 
1102
 
    # Checker - property
1103
 
    @dbus_service_property(_interface, signature="s",
1104
 
                           access="readwrite")
1105
 
    def Checker_dbus_property(self, value=None):
1106
 
        if value is None:       # get
1107
 
            return dbus.String(self.checker_command)
1108
 
        self.checker_command = value
1109
 
        # Emit D-Bus signal
1110
 
        self.PropertyChanged(dbus.String("Checker"),
1111
 
                             dbus.String(self.checker_command,
1112
 
                                         variant_level=1))
1113
 
    
1114
 
    # CheckerRunning - property
1115
 
    @dbus_service_property(_interface, signature="b",
1116
 
                           access="readwrite")
1117
 
    def CheckerRunning_dbus_property(self, value=None):
1118
 
        if value is None:       # get
1119
 
            return dbus.Boolean(self.checker is not None)
1120
 
        if value:
1121
 
            self.start_checker()
1122
 
        else:
1123
 
            self.stop_checker()
1124
 
    
1125
 
    # ObjectPath - property
1126
 
    @dbus_service_property(_interface, signature="o", access="read")
1127
 
    def ObjectPath_dbus_property(self):
1128
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1129
 
    
1130
 
    # Secret = property
1131
 
    @dbus_service_property(_interface, signature="ay",
1132
 
                           access="write", byte_arrays=True)
1133
 
    def Secret_dbus_property(self, value):
1134
 
        self.secret = str(value)
1135
 
    
1136
 
    del _interface
1137
 
 
1138
 
 
1139
 
class ProxyClient(object):
1140
 
    def __init__(self, child_pipe, fpr, address):
1141
 
        self._pipe = child_pipe
1142
 
        self._pipe.send(('init', fpr, address))
1143
 
        if not self._pipe.recv():
1144
 
            raise KeyError()
1145
 
 
1146
 
    def __getattribute__(self, name):
1147
 
        if(name == '_pipe'):
1148
 
            return super(ProxyClient, self).__getattribute__(name)
1149
 
        self._pipe.send(('getattr', name))
1150
 
        data = self._pipe.recv()
1151
 
        if data[0] == 'data':
1152
 
            return data[1]
1153
 
        if data[0] == 'function':
1154
 
            def func(*args, **kwargs):
1155
 
                self._pipe.send(('funcall', name, args, kwargs))
1156
 
                return self._pipe.recv()[1]
1157
 
            return func
1158
 
 
1159
 
    def __setattr__(self, name, value):
1160
 
        if(name == '_pipe'):
1161
 
            return super(ProxyClient, self).__setattr__(name, value)
1162
 
        self._pipe.send(('setattr', name, value))
1163
 
 
1164
 
 
1165
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1166
 
    """A class to handle client connections.
1167
 
    
1168
 
    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.
1169
307
    Note: This will run in its own forked process."""
1170
308
    
1171
309
    def handle(self):
1172
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1173
 
            logger.info("TCP connection from: %s",
1174
 
                        unicode(self.client_address))
1175
 
            logger.debug("Pipe FD: %d",
1176
 
                         self.server.child_pipe.fileno())
1177
 
 
1178
 
            session = (gnutls.connection
1179
 
                       .ClientSession(self.request,
1180
 
                                      gnutls.connection
1181
 
                                      .X509Credentials()))
1182
 
 
1183
 
            # Note: gnutls.connection.X509Credentials is really a
1184
 
            # generic GnuTLS certificate credentials object so long as
1185
 
            # no X.509 keys are added to it.  Therefore, we can use it
1186
 
            # here despite using OpenPGP certificates.
1187
 
 
1188
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1189
 
            #                      "+AES-256-CBC", "+SHA1",
1190
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1191
 
            #                      "+DHE-DSS"))
1192
 
            # Use a fallback default, since this MUST be set.
1193
 
            priority = self.server.gnutls_priority
1194
 
            if priority is None:
1195
 
                priority = "NORMAL"
1196
 
            (gnutls.library.functions
1197
 
             .gnutls_priority_set_direct(session._c_object,
1198
 
                                         priority, None))
1199
 
 
1200
 
            # Start communication using the Mandos protocol
1201
 
            # Get protocol number
1202
 
            line = self.request.makefile().readline()
1203
 
            logger.debug("Protocol version: %r", line)
1204
 
            try:
1205
 
                if int(line.strip().split()[0]) > 1:
1206
 
                    raise RuntimeError
1207
 
            except (ValueError, IndexError, RuntimeError), error:
1208
 
                logger.error("Unknown protocol version: %s", error)
1209
 
                return
1210
 
 
1211
 
            # Start GnuTLS connection
1212
 
            try:
1213
 
                session.handshake()
1214
 
            except gnutls.errors.GNUTLSError, error:
1215
 
                logger.warning("Handshake failed: %s", error)
1216
 
                # Do not run session.bye() here: the session is not
1217
 
                # established.  Just abandon the request.
1218
 
                return
1219
 
            logger.debug("Handshake succeeded")
1220
 
 
1221
 
            approval_required = False
1222
 
            try:
1223
 
                try:
1224
 
                    fpr = self.fingerprint(self.peer_certificate
1225
 
                                           (session))
1226
 
                except (TypeError, gnutls.errors.GNUTLSError), error:
1227
 
                    logger.warning("Bad certificate: %s", error)
1228
 
                    return
1229
 
                logger.debug("Fingerprint: %s", fpr)
1230
 
 
1231
 
                try:
1232
 
                    client = ProxyClient(child_pipe, fpr,
1233
 
                                         self.client_address)
1234
 
                except KeyError:
1235
 
                    return
1236
 
                
1237
 
                if client.approval_delay:
1238
 
                    delay = client.approval_delay
1239
 
                    client.approvals_pending += 1
1240
 
                    approval_required = True
1241
 
                
1242
 
                while True:
1243
 
                    if not client.enabled:
1244
 
                        logger.warning("Client %s is disabled",
1245
 
                                       client.name)
1246
 
                        if self.server.use_dbus:
1247
 
                            # Emit D-Bus signal
1248
 
                            client.Rejected("Disabled")                    
1249
 
                        return
1250
 
                    
1251
 
                    if client._approved or not client.approval_delay:
1252
 
                        #We are approved or approval is disabled
1253
 
                        break
1254
 
                    elif client._approved is None:
1255
 
                        logger.info("Client %s needs approval",
1256
 
                                    client.name)
1257
 
                        if self.server.use_dbus:
1258
 
                            # Emit D-Bus signal
1259
 
                            client.NeedApproval(
1260
 
                                client.approval_delay_milliseconds(),
1261
 
                                client.approved_by_default)
1262
 
                    else:
1263
 
                        logger.warning("Client %s was not approved",
1264
 
                                       client.name)
1265
 
                        if self.server.use_dbus:
1266
 
                            # Emit D-Bus signal
1267
 
                            client.Rejected("Denied")
1268
 
                        return
1269
 
                    
1270
 
                    #wait until timeout or approved
1271
 
                    #x = float(client._timedelta_to_milliseconds(delay))
1272
 
                    time = datetime.datetime.now()
1273
 
                    client.changedstate.acquire()
1274
 
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1275
 
                    client.changedstate.release()
1276
 
                    time2 = datetime.datetime.now()
1277
 
                    if (time2 - time) >= delay:
1278
 
                        if not client.approved_by_default:
1279
 
                            logger.warning("Client %s timed out while"
1280
 
                                           " waiting for approval",
1281
 
                                           client.name)
1282
 
                            if self.server.use_dbus:
1283
 
                                # Emit D-Bus signal
1284
 
                                client.Rejected("Approval timed out")
1285
 
                            return
1286
 
                        else:
1287
 
                            break
1288
 
                    else:
1289
 
                        delay -= time2 - time
1290
 
                
1291
 
                sent_size = 0
1292
 
                while sent_size < len(client.secret):
1293
 
                    try:
1294
 
                        sent = session.send(client.secret[sent_size:])
1295
 
                    except (gnutls.errors.GNUTLSError), error:
1296
 
                        logger.warning("gnutls send failed")
1297
 
                        return
1298
 
                    logger.debug("Sent: %d, remaining: %d",
1299
 
                                 sent, len(client.secret)
1300
 
                                 - (sent_size + sent))
1301
 
                    sent_size += sent
1302
 
 
1303
 
                logger.info("Sending secret to %s", client.name)
1304
 
                # bump the timeout as if seen
1305
 
                client.checked_ok()
1306
 
                if self.server.use_dbus:
1307
 
                    # Emit D-Bus signal
1308
 
                    client.GotSecret()
1309
 
            
1310
 
            finally:
1311
 
                if approval_required:
1312
 
                    client.approvals_pending -= 1
1313
 
                try:
1314
 
                    session.bye()
1315
 
                except (gnutls.errors.GNUTLSError), error:
1316
 
                    logger.warning("GnuTLS bye failed")
1317
 
    
1318
 
    @staticmethod
1319
 
    def peer_certificate(session):
1320
 
        "Return the peer's OpenPGP certificate as a bytestring"
1321
 
        # If not an OpenPGP certificate...
1322
 
        if (gnutls.library.functions
1323
 
            .gnutls_certificate_type_get(session._c_object)
1324
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1325
 
            # ...do the normal thing
1326
 
            return session.peer_certificate
1327
 
        list_size = ctypes.c_uint(1)
1328
 
        cert_list = (gnutls.library.functions
1329
 
                     .gnutls_certificate_get_peers
1330
 
                     (session._c_object, ctypes.byref(list_size)))
1331
 
        if not bool(cert_list) and list_size.value != 0:
1332
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1333
 
                                            " certificate")
1334
 
        if list_size.value == 0:
1335
 
            return None
1336
 
        cert = cert_list[0]
1337
 
        return ctypes.string_at(cert.data, cert.size)
1338
 
    
1339
 
    @staticmethod
1340
 
    def fingerprint(openpgp):
1341
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1342
 
        # New GnuTLS "datum" with the OpenPGP public key
1343
 
        datum = (gnutls.library.types
1344
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1345
 
                                             ctypes.POINTER
1346
 
                                             (ctypes.c_ubyte)),
1347
 
                                 ctypes.c_uint(len(openpgp))))
1348
 
        # New empty GnuTLS certificate
1349
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1350
 
        (gnutls.library.functions
1351
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1352
 
        # Import the OpenPGP public key into the certificate
1353
 
        (gnutls.library.functions
1354
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1355
 
                                    gnutls.library.constants
1356
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1357
 
        # Verify the self signature in the key
1358
 
        crtverify = ctypes.c_uint()
1359
 
        (gnutls.library.functions
1360
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1361
 
                                         ctypes.byref(crtverify)))
1362
 
        if crtverify.value != 0:
1363
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1364
 
            raise (gnutls.errors.CertificateSecurityError
1365
 
                   ("Verify failed"))
1366
 
        # New buffer for the fingerprint
1367
 
        buf = ctypes.create_string_buffer(20)
1368
 
        buf_len = ctypes.c_size_t()
1369
 
        # Get the fingerprint from the certificate into the buffer
1370
 
        (gnutls.library.functions
1371
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1372
 
                                             ctypes.byref(buf_len)))
1373
 
        # Deinit the certificate
1374
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1375
 
        # Convert the buffer to a Python bytestring
1376
 
        fpr = ctypes.string_at(buf, buf_len.value)
1377
 
        # Convert the bytestring to hexadecimal notation
1378
 
        hex_fpr = ''.join("%02X" % ord(char) for char in fpr)
1379
 
        return hex_fpr
1380
 
 
1381
 
 
1382
 
class MultiprocessingMixIn(object):
1383
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1384
 
    def sub_process_main(self, request, address):
1385
 
        try:
1386
 
            self.finish_request(request, address)
1387
 
        except:
1388
 
            self.handle_error(request, address)
1389
 
        self.close_request(request)
1390
 
            
1391
 
    def process_request(self, request, address):
1392
 
        """Start a new process to process the request."""
1393
 
        multiprocessing.Process(target = self.sub_process_main,
1394
 
                                args = (request, address)).start()
1395
 
 
1396
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1397
 
    """ adds a pipe to the MixIn """
1398
 
    def process_request(self, request, client_address):
1399
 
        """Overrides and wraps the original process_request().
1400
 
        
1401
 
        This function creates a new pipe in self.pipe
1402
 
        """
1403
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1404
 
 
1405
 
        super(MultiprocessingMixInWithPipe,
1406
 
              self).process_request(request, client_address)
1407
 
        self.child_pipe.close()
1408
 
        self.add_pipe(parent_pipe)
1409
 
 
1410
 
    def add_pipe(self, parent_pipe):
1411
 
        """Dummy function; override as necessary"""
1412
 
        raise NotImplementedError
1413
 
 
1414
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1415
 
                     socketserver.TCPServer, object):
1416
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1417
 
    
 
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.
1418
367
    Attributes:
1419
 
        enabled:        Boolean; whether this server is activated yet
1420
 
        interface:      None or a network interface name (string)
1421
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1422
370
    """
1423
 
    def __init__(self, server_address, RequestHandlerClass,
1424
 
                 interface=None, use_ipv6=True):
1425
 
        self.interface = interface
1426
 
        if use_ipv6:
1427
 
            self.address_family = socket.AF_INET6
1428
 
        socketserver.TCPServer.__init__(self, server_address,
1429
 
                                        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)
1430
380
    def server_bind(self):
1431
381
        """This overrides the normal server_bind() function
1432
382
        to bind to an interface if one was specified, and also NOT to
1433
383
        bind to an address or port if they were not specified."""
1434
 
        if self.interface is not None:
1435
 
            if SO_BINDTODEVICE is None:
1436
 
                logger.error("SO_BINDTODEVICE does not exist;"
1437
 
                             " cannot bind to interface %s",
1438
 
                             self.interface)
1439
 
            else:
1440
 
                try:
1441
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1442
 
                                           SO_BINDTODEVICE,
1443
 
                                           str(self.interface
1444
 
                                               + '\0'))
1445
 
                except socket.error, error:
1446
 
                    if error[0] == errno.EPERM:
1447
 
                        logger.error("No permission to"
1448
 
                                     " bind to interface %s",
1449
 
                                     self.interface)
1450
 
                    elif error[0] == errno.ENOPROTOOPT:
1451
 
                        logger.error("SO_BINDTODEVICE not available;"
1452
 
                                     " cannot bind to interface %s",
1453
 
                                     self.interface)
1454
 
                    else:
1455
 
                        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
1456
399
        # Only bind(2) the socket if we really need to.
1457
400
        if self.server_address[0] or self.server_address[1]:
1458
401
            if not self.server_address[0]:
1459
 
                if self.address_family == socket.AF_INET6:
1460
 
                    any_address = "::" # in6addr_any
1461
 
                else:
1462
 
                    any_address = socket.INADDR_ANY
1463
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1464
404
                                       self.server_address[1])
1465
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1466
406
                self.server_address = (self.server_address[0],
1467
407
                                       0)
1468
 
#                 if self.interface:
1469
 
#                     self.server_address = (self.server_address[0],
1470
 
#                                            0, # port
1471
 
#                                            0, # flowinfo
1472
 
#                                            if_nametoindex
1473
 
#                                            (self.interface))
1474
 
            return socketserver.TCPServer.server_bind(self)
1475
 
 
1476
 
 
1477
 
class MandosServer(IPv6_TCPServer):
1478
 
    """Mandos server.
1479
 
    
1480
 
    Attributes:
1481
 
        clients:        set of Client objects
1482
 
        gnutls_priority GnuTLS priority string
1483
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1484
 
    
1485
 
    Assumes a gobject.MainLoop event loop.
1486
 
    """
1487
 
    def __init__(self, server_address, RequestHandlerClass,
1488
 
                 interface=None, use_ipv6=True, clients=None,
1489
 
                 gnutls_priority=None, use_dbus=True):
1490
 
        self.enabled = False
1491
 
        self.clients = clients
1492
 
        if self.clients is None:
1493
 
            self.clients = set()
1494
 
        self.use_dbus = use_dbus
1495
 
        self.gnutls_priority = gnutls_priority
1496
 
        IPv6_TCPServer.__init__(self, server_address,
1497
 
                                RequestHandlerClass,
1498
 
                                interface = interface,
1499
 
                                use_ipv6 = use_ipv6)
1500
 
    def server_activate(self):
1501
 
        if self.enabled:
1502
 
            return socketserver.TCPServer.server_activate(self)
1503
 
    def enable(self):
1504
 
        self.enabled = True
1505
 
    def add_pipe(self, parent_pipe):
1506
 
        # Call "handle_ipc" for both data and EOF events
1507
 
        gobject.io_add_watch(parent_pipe.fileno(),
1508
 
                             gobject.IO_IN | gobject.IO_HUP,
1509
 
                             functools.partial(self.handle_ipc,
1510
 
                                               parent_pipe = parent_pipe))
1511
 
        
1512
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1513
 
                   client_object=None):
1514
 
        condition_names = {
1515
 
            gobject.IO_IN: "IN",   # There is data to read.
1516
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1517
 
                                    # blocking).
1518
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1519
 
            gobject.IO_ERR: "ERR", # Error condition.
1520
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1521
 
                                    # broken, usually for pipes and
1522
 
                                    # sockets).
1523
 
            }
1524
 
        conditions_string = ' | '.join(name
1525
 
                                       for cond, name in
1526
 
                                       condition_names.iteritems()
1527
 
                                       if cond & condition)
1528
 
        # error or the other end of multiprocessing.Pipe has closed
1529
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1530
 
            return False
1531
 
        
1532
 
        # Read a request from the child
1533
 
        request = parent_pipe.recv()
1534
 
        command = request[0]
1535
 
        
1536
 
        if command == 'init':
1537
 
            fpr = request[1]
1538
 
            address = request[2]
1539
 
            
1540
 
            for c in self.clients:
1541
 
                if c.fingerprint == fpr:
1542
 
                    client = c
1543
 
                    break
1544
 
            else:
1545
 
                logger.warning("Client not found for fingerprint: %s, ad"
1546
 
                               "dress: %s", fpr, address)
1547
 
                if self.use_dbus:
1548
 
                    # Emit D-Bus signal
1549
 
                    mandos_dbus_service.ClientNotFound(fpr, address[0])
1550
 
                parent_pipe.send(False)
1551
 
                return False
1552
 
            
1553
 
            gobject.io_add_watch(parent_pipe.fileno(),
1554
 
                                 gobject.IO_IN | gobject.IO_HUP,
1555
 
                                 functools.partial(self.handle_ipc,
1556
 
                                                   parent_pipe = parent_pipe,
1557
 
                                                   client_object = client))
1558
 
            parent_pipe.send(True)
1559
 
            # remove the old hook in favor of the new above hook on same fileno
1560
 
            return False
1561
 
        if command == 'funcall':
1562
 
            funcname = request[1]
1563
 
            args = request[2]
1564
 
            kwargs = request[3]
1565
 
            
1566
 
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1567
 
 
1568
 
        if command == 'getattr':
1569
 
            attrname = request[1]
1570
 
            if callable(client_object.__getattribute__(attrname)):
1571
 
                parent_pipe.send(('function',))
1572
 
            else:
1573
 
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1574
 
        
1575
 
        if command == 'setattr':
1576
 
            attrname = request[1]
1577
 
            value = request[2]
1578
 
            setattr(client_object, attrname, value)
1579
 
 
1580
 
        return True
 
408
            return super(type(self), self).server_bind()
1581
409
 
1582
410
 
1583
411
def string_to_delta(interval):
1584
412
    """Parse a string and return a datetime.timedelta
1585
 
    
 
413
 
1586
414
    >>> string_to_delta('7d')
1587
415
    datetime.timedelta(7)
1588
416
    >>> string_to_delta('60s')
1591
419
    datetime.timedelta(0, 3600)
1592
420
    >>> string_to_delta('24h')
1593
421
    datetime.timedelta(1)
1594
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1595
423
    datetime.timedelta(7)
1596
 
    >>> string_to_delta('5m 30s')
1597
 
    datetime.timedelta(0, 330)
1598
424
    """
1599
 
    timevalue = datetime.timedelta(0)
1600
 
    for s in interval.split():
1601
 
        try:
1602
 
            suffix = unicode(s[-1])
1603
 
            value = int(s[:-1])
1604
 
            if suffix == "d":
1605
 
                delta = datetime.timedelta(value)
1606
 
            elif suffix == "s":
1607
 
                delta = datetime.timedelta(0, value)
1608
 
            elif suffix == "m":
1609
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1610
 
            elif suffix == "h":
1611
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1612
 
            elif suffix == "w":
1613
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1614
 
            else:
1615
 
                raise ValueError("Unknown suffix %r" % suffix)
1616
 
        except (ValueError, IndexError), e:
1617
 
            raise ValueError(*(e.args))
1618
 
        timevalue += delta
1619
 
    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
1620
515
 
1621
516
 
1622
517
def if_nametoindex(interface):
1623
 
    """Call the C function if_nametoindex(), or equivalent
1624
 
    
1625
 
    Note: This function cannot accept a unicode string."""
1626
 
    global if_nametoindex
 
518
    """Call the C function if_nametoindex()"""
1627
519
    try:
1628
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1629
 
                          (ctypes.util.find_library("c"))
1630
 
                          .if_nametoindex)
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
1631
522
    except (OSError, AttributeError):
1632
 
        logger.warning("Doing if_nametoindex the hard way")
1633
 
        def if_nametoindex(interface):
1634
 
            "Get an interface index the hard way, i.e. using fcntl()"
1635
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1636
 
            with contextlib.closing(socket.socket()) as s:
1637
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1638
 
                                    struct.pack(str("16s16x"),
1639
 
                                                interface))
1640
 
            interface_index = struct.unpack(str("I"),
1641
 
                                            ifreq[16:20])[0]
1642
 
            return interface_index
1643
 
    return if_nametoindex(interface)
1644
 
 
1645
 
 
1646
 
def daemon(nochdir = False, noclose = False):
1647
 
    """See daemon(3).  Standard BSD Unix function.
1648
 
    
1649
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1650
 
    if os.fork():
1651
 
        sys.exit()
1652
 
    os.setsid()
1653
 
    if not nochdir:
1654
 
        os.chdir("/")
1655
 
    if os.fork():
1656
 
        sys.exit()
1657
 
    if not noclose:
1658
 
        # Close all standard open file descriptors
1659
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1660
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1661
 
            raise OSError(errno.ENODEV,
1662
 
                          "%s not a character device"
1663
 
                          % os.path.devnull)
1664
 
        os.dup2(null, sys.stdin.fileno())
1665
 
        os.dup2(null, sys.stdout.fileno())
1666
 
        os.dup2(null, sys.stderr.fileno())
1667
 
        if null > 2:
1668
 
            os.close(null)
1669
 
 
1670
 
 
1671
 
def main():
1672
 
    
1673
 
    ##################################################################
1674
 
    # Parsing of options, both command line and config file
1675
 
    
1676
 
    parser = argparse.ArgumentParser()
1677
 
    parser.add_argument("-v", "--version", action="version",
1678
 
                        version = "%%(prog)s %s" % version,
1679
 
                        help="show version number and exit")
1680
 
    parser.add_argument("-i", "--interface", metavar="IF",
1681
 
                        help="Bind to interface IF")
1682
 
    parser.add_argument("-a", "--address",
1683
 
                        help="Address to listen for requests on")
1684
 
    parser.add_argument("-p", "--port", type=int,
1685
 
                        help="Port number to receive requests on")
1686
 
    parser.add_argument("--check", action="store_true",
1687
 
                        help="Run self-test")
1688
 
    parser.add_argument("--debug", action="store_true",
1689
 
                        help="Debug mode; run in foreground and log"
1690
 
                        " to terminal")
1691
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1692
 
                        help="Debug level for stdout output")
1693
 
    parser.add_argument("--priority", help="GnuTLS"
1694
 
                        " priority string (see GnuTLS documentation)")
1695
 
    parser.add_argument("--servicename",
1696
 
                        metavar="NAME", help="Zeroconf service name")
1697
 
    parser.add_argument("--configdir",
1698
 
                        default="/etc/mandos", metavar="DIR",
1699
 
                        help="Directory to search for configuration"
1700
 
                        " files")
1701
 
    parser.add_argument("--no-dbus", action="store_false",
1702
 
                        dest="use_dbus", help="Do not provide D-Bus"
1703
 
                        " system bus interface")
1704
 
    parser.add_argument("--no-ipv6", action="store_false",
1705
 
                        dest="use_ipv6", help="Do not use IPv6")
1706
 
    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()
1707
566
    
1708
567
    if options.check:
1709
568
        import doctest
1710
569
        doctest.testmod()
1711
570
        sys.exit()
1712
571
    
1713
 
    # Default values for config file for server-global settings
1714
 
    server_defaults = { "interface": "",
1715
 
                        "address": "",
1716
 
                        "port": "",
1717
 
                        "debug": "False",
1718
 
                        "priority":
1719
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1720
 
                        "servicename": "Mandos",
1721
 
                        "use_dbus": "True",
1722
 
                        "use_ipv6": "True",
1723
 
                        "debuglevel": "",
1724
 
                        }
1725
 
    
1726
 
    # Parse config file for server-global settings
1727
 
    server_config = configparser.SafeConfigParser(server_defaults)
1728
 
    del server_defaults
1729
 
    server_config.read(os.path.join(options.configdir,
1730
 
                                    "mandos.conf"))
1731
 
    # Convert the SafeConfigParser object to a dict
1732
 
    server_settings = server_config.defaults()
1733
 
    # Use the appropriate methods on the non-string config options
1734
 
    for option in ("debug", "use_dbus", "use_ipv6"):
1735
 
        server_settings[option] = server_config.getboolean("DEFAULT",
1736
 
                                                           option)
1737
 
    if server_settings["port"]:
1738
 
        server_settings["port"] = server_config.getint("DEFAULT",
1739
 
                                                       "port")
1740
 
    del server_config
1741
 
    
1742
 
    # Override the settings from the config file with command line
1743
 
    # options, if set.
1744
 
    for option in ("interface", "address", "port", "debug",
1745
 
                   "priority", "servicename", "configdir",
1746
 
                   "use_dbus", "use_ipv6", "debuglevel"):
1747
 
        value = getattr(options, option)
1748
 
        if value is not None:
1749
 
            server_settings[option] = value
1750
 
    del options
1751
 
    # Force all strings to be unicode
1752
 
    for option in server_settings.keys():
1753
 
        if type(server_settings[option]) is str:
1754
 
            server_settings[option] = unicode(server_settings[option])
1755
 
    # Now we have our good server settings in "server_settings"
1756
 
    
1757
 
    ##################################################################
1758
 
    
1759
 
    # For convenience
1760
 
    debug = server_settings["debug"]
1761
 
    debuglevel = server_settings["debuglevel"]
1762
 
    use_dbus = server_settings["use_dbus"]
1763
 
    use_ipv6 = server_settings["use_ipv6"]
1764
 
 
1765
 
    if server_settings["servicename"] != "Mandos":
1766
 
        syslogger.setFormatter(logging.Formatter
1767
 
                               ('Mandos (%s) [%%(process)d]:'
1768
 
                                ' %%(levelname)s: %%(message)s'
1769
 
                                % server_settings["servicename"]))
1770
 
    
1771
 
    # Parse config file with clients
1772
 
    client_defaults = { "timeout": "1h",
1773
 
                        "interval": "5m",
1774
 
                        "checker": "fping -q -- %%(host)s",
1775
 
                        "host": "",
1776
 
                        "approval_delay": "0s",
1777
 
                        "approval_duration": "1s",
1778
 
                        }
1779
 
    client_config = configparser.SafeConfigParser(client_defaults)
1780
 
    client_config.read(os.path.join(server_settings["configdir"],
1781
 
                                    "clients.conf"))
1782
 
    
1783
 
    global mandos_dbus_service
1784
 
    mandos_dbus_service = None
1785
 
    
1786
 
    tcp_server = MandosServer((server_settings["address"],
1787
 
                               server_settings["port"]),
1788
 
                              ClientHandler,
1789
 
                              interface=(server_settings["interface"]
1790
 
                                         or None),
1791
 
                              use_ipv6=use_ipv6,
1792
 
                              gnutls_priority=
1793
 
                              server_settings["priority"],
1794
 
                              use_dbus=use_dbus)
1795
 
    if not debug:
1796
 
        pidfilename = "/var/run/mandos.pid"
1797
 
        try:
1798
 
            pidfile = open(pidfilename, "w")
1799
 
        except IOError:
1800
 
            logger.error("Could not open file %r", pidfilename)
1801
 
    
1802
 
    try:
1803
 
        uid = pwd.getpwnam("_mandos").pw_uid
1804
 
        gid = pwd.getpwnam("_mandos").pw_gid
1805
 
    except KeyError:
1806
 
        try:
1807
 
            uid = pwd.getpwnam("mandos").pw_uid
1808
 
            gid = pwd.getpwnam("mandos").pw_gid
1809
 
        except KeyError:
1810
 
            try:
1811
 
                uid = pwd.getpwnam("nobody").pw_uid
1812
 
                gid = pwd.getpwnam("nobody").pw_gid
1813
 
            except KeyError:
1814
 
                uid = 65534
1815
 
                gid = 65534
1816
 
    try:
1817
 
        os.setgid(gid)
1818
 
        os.setuid(uid)
1819
 
    except OSError, error:
1820
 
        if error[0] != errno.EPERM:
1821
 
            raise error
1822
 
    
1823
 
    if not debug and not debuglevel:
1824
 
        syslogger.setLevel(logging.WARNING)
1825
 
        console.setLevel(logging.WARNING)
1826
 
    if debuglevel:
1827
 
        level = getattr(logging, debuglevel.upper())
1828
 
        syslogger.setLevel(level)
1829
 
        console.setLevel(level)
1830
 
 
1831
 
    if debug:
1832
 
        # Enable all possible GnuTLS debugging
1833
 
        
1834
 
        # "Use a log level over 10 to enable all debugging options."
1835
 
        # - GnuTLS manual
1836
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1837
 
        
1838
 
        @gnutls.library.types.gnutls_log_func
1839
 
        def debug_gnutls(level, string):
1840
 
            logger.debug("GnuTLS: %s", string[:-1])
1841
 
        
1842
 
        (gnutls.library.functions
1843
 
         .gnutls_global_set_log_function(debug_gnutls))
1844
 
        
1845
 
        # Redirect stdin so all checkers get /dev/null
1846
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1847
 
        os.dup2(null, sys.stdin.fileno())
1848
 
        if null > 2:
1849
 
            os.close(null)
1850
 
    else:
1851
 
        # No console logging
1852
 
        logger.removeHandler(console)
1853
 
    
1854
 
    # Need to fork before connecting to D-Bus
1855
 
    if not debug:
1856
 
        # Close all input and output, do double fork, etc.
1857
 
        daemon()
1858
 
    
1859
 
    global main_loop
1860
 
    # 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
1861
589
    DBusGMainLoop(set_as_default=True )
1862
590
    main_loop = gobject.MainLoop()
1863
591
    bus = dbus.SystemBus()
1864
 
    # End of Avahi example code
1865
 
    if use_dbus:
1866
 
        try:
1867
 
            bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",
1868
 
                                            bus, do_not_queue=True)
1869
 
        except dbus.exceptions.NameExistsException, e:
1870
 
            logger.error(unicode(e) + ", disabling D-Bus")
1871
 
            use_dbus = False
1872
 
            server_settings["use_dbus"] = False
1873
 
            tcp_server.use_dbus = False
1874
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1875
 
    service = AvahiService(name = server_settings["servicename"],
1876
 
                           servicetype = "_mandos._tcp",
1877
 
                           protocol = protocol, bus = bus)
1878
 
    if server_settings["interface"]:
1879
 
        service.interface = (if_nametoindex
1880
 
                             (str(server_settings["interface"])))
1881
 
    
1882
 
    global multiprocessing_manager
1883
 
    multiprocessing_manager = multiprocessing.Manager()
1884
 
    
1885
 
    client_class = Client
1886
 
    if use_dbus:
1887
 
        client_class = functools.partial(ClientDBus, bus = bus)
1888
 
    def client_config_items(config, section):
1889
 
        special_settings = {
1890
 
            "approved_by_default":
1891
 
                lambda: config.getboolean(section,
1892
 
                                          "approved_by_default"),
1893
 
            }
1894
 
        for name, value in config.items(section):
1895
 
            try:
1896
 
                yield (name, special_settings[name]())
1897
 
            except KeyError:
1898
 
                yield (name, value)
1899
 
    
1900
 
    tcp_server.clients.update(set(
1901
 
            client_class(name = section,
1902
 
                         config= dict(client_config_items(
1903
 
                        client_config, section)))
1904
 
            for section in client_config.sections()))
1905
 
    if not tcp_server.clients:
1906
 
        logger.warning("No clients defined")
1907
 
        
1908
 
    if not debug:
1909
 
        try:
1910
 
            with pidfile:
1911
 
                pid = os.getpid()
1912
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
1913
 
            del pidfile
1914
 
        except IOError:
1915
 
            logger.error("Could not write to file %r with PID %d",
1916
 
                         pidfilename, pid)
1917
 
        except NameError:
1918
 
            # "pidfile" was never created
1919
 
            pass
1920
 
        del pidfilename
1921
 
        
1922
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1923
 
 
1924
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1925
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1926
 
    
1927
 
    if use_dbus:
1928
 
        class MandosDBusService(dbus.service.Object):
1929
 
            """A D-Bus proxy object"""
1930
 
            def __init__(self):
1931
 
                dbus.service.Object.__init__(self, bus, "/")
1932
 
            _interface = "se.bsnet.fukt.Mandos"
1933
 
            
1934
 
            @dbus.service.signal(_interface, signature="o")
1935
 
            def ClientAdded(self, objpath):
1936
 
                "D-Bus signal"
1937
 
                pass
1938
 
            
1939
 
            @dbus.service.signal(_interface, signature="ss")
1940
 
            def ClientNotFound(self, fingerprint, address):
1941
 
                "D-Bus signal"
1942
 
                pass
1943
 
            
1944
 
            @dbus.service.signal(_interface, signature="os")
1945
 
            def ClientRemoved(self, objpath, name):
1946
 
                "D-Bus signal"
1947
 
                pass
1948
 
            
1949
 
            @dbus.service.method(_interface, out_signature="ao")
1950
 
            def GetAllClients(self):
1951
 
                "D-Bus method"
1952
 
                return dbus.Array(c.dbus_object_path
1953
 
                                  for c in tcp_server.clients)
1954
 
            
1955
 
            @dbus.service.method(_interface,
1956
 
                                 out_signature="a{oa{sv}}")
1957
 
            def GetAllClientsWithProperties(self):
1958
 
                "D-Bus method"
1959
 
                return dbus.Dictionary(
1960
 
                    ((c.dbus_object_path, c.GetAll(""))
1961
 
                     for c in tcp_server.clients),
1962
 
                    signature="oa{sv}")
1963
 
            
1964
 
            @dbus.service.method(_interface, in_signature="o")
1965
 
            def RemoveClient(self, object_path):
1966
 
                "D-Bus method"
1967
 
                for c in tcp_server.clients:
1968
 
                    if c.dbus_object_path == object_path:
1969
 
                        tcp_server.clients.remove(c)
1970
 
                        c.remove_from_connection()
1971
 
                        # Don't signal anything except ClientRemoved
1972
 
                        c.disable(quiet=True)
1973
 
                        # Emit D-Bus signal
1974
 
                        self.ClientRemoved(object_path, c.name)
1975
 
                        return
1976
 
                raise KeyError(object_path)
1977
 
            
1978
 
            del _interface
1979
 
        
1980
 
        mandos_dbus_service = MandosDBusService()
1981
 
    
1982
 
    def cleanup():
1983
 
        "Cleanup function; run on exit"
1984
 
        service.cleanup()
1985
 
        
1986
 
        while tcp_server.clients:
1987
 
            client = tcp_server.clients.pop()
1988
 
            if use_dbus:
1989
 
                client.remove_from_connection()
1990
 
            client.disable_hook = None
1991
 
            # Don't signal anything except ClientRemoved
1992
 
            client.disable(quiet=True)
1993
 
            if use_dbus:
1994
 
                # Emit D-Bus signal
1995
 
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1996
 
                                                  client.name)
1997
 
    
1998
 
    atexit.register(cleanup)
1999
 
    
2000
 
    for client in tcp_server.clients:
2001
 
        if use_dbus:
2002
 
            # Emit D-Bus signal
2003
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2004
 
        client.enable()
2005
 
    
2006
 
    tcp_server.enable()
2007
 
    tcp_server.server_activate()
2008
 
    
2009
 
    # Find out what port we got
2010
 
    service.port = tcp_server.socket.getsockname()[1]
2011
 
    if use_ipv6:
2012
 
        logger.info("Now listening on address %r, port %d,"
2013
 
                    " flowinfo %d, scope_id %d"
2014
 
                    % tcp_server.socket.getsockname())
2015
 
    else:                       # IPv4
2016
 
        logger.info("Now listening on address %r, port %d"
2017
 
                    % tcp_server.socket.getsockname())
2018
 
    
2019
 
    #service.interface = tcp_server.socket.getsockname()[3]
2020
 
    
 
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)
2021
634
    try:
2022
 
        # From the Avahi example code
2023
 
        try:
2024
 
            service.activate()
2025
 
        except dbus.exceptions.DBusException, error:
2026
 
            logger.critical("DBusException: %s", error)
2027
 
            cleanup()
2028
 
            sys.exit(1)
2029
 
        # End of Avahi example code
2030
 
        
2031
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2032
 
                             lambda *args, **kwargs:
2033
 
                             (tcp_server.handle_request
2034
 
                              (*args[2:], **kwargs) or True))
2035
 
        
2036
 
        logger.debug("Starting main loop")
2037
635
        main_loop.run()
2038
 
    except AvahiError, error:
2039
 
        logger.critical("AvahiError: %s", error)
2040
 
        cleanup()
2041
 
        sys.exit(1)
2042
636
    except KeyboardInterrupt:
2043
 
        if debug:
2044
 
            print("", file=sys.stderr)
2045
 
        logger.debug("Server received KeyboardInterrupt")
2046
 
    logger.debug("Server exiting")
2047
 
    # Must run before the D-Bus bus name gets deregistered
2048
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
2049
640
 
2050
 
if __name__ == '__main__':
2051
 
    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()