/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2009-01-31 10:33:17 UTC
  • mfrom: (24.1.129 mandos)
  • Revision ID: teddy@fukt.bsnet.se-20090131103317-wzqvyr532sjcjt7u
Merge from Björn:

* mandos-ctl: New option "--remove-client".  Only default to listing
              clients if no clients were given on the command line.
* plugins.d/mandos-client.c: Lower kernel log level while bringing up
                             network interface.  New option "--delay"
                             to control the maximum delay to wait for
                             running interface.
* plugins.d/mandos-client.xml (SYNOPSIS, OPTIONS): New option
                                                   "--delay".

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mandos
1
1
#!/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" and "remove" in the "AvahiService" class, the
 
10
# "server_state_changed" and "entry_group_state_changed" functions,
 
11
# and some lines in "main".
 
12
# 
 
13
# Everything else is
 
14
# Copyright © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
 
16
# 
 
17
# This program is free software: you can redistribute it and/or modify
 
18
# it under the terms of the GNU General Public License as published by
 
19
# the Free Software Foundation, either version 3 of the License, or
 
20
# (at your option) any later version.
 
21
#
 
22
#     This program is distributed in the hope that it will be useful,
 
23
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
 
24
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
25
#     GNU General Public License for more details.
 
26
# 
 
27
# You should have received a copy of the GNU General Public License
 
28
# along with this program.  If not, see
 
29
# <http://www.gnu.org/licenses/>.
 
30
# 
 
31
# Contact the authors at <mandos@fukt.bsnet.se>.
 
32
# 
 
33
 
 
34
from __future__ import division, with_statement, absolute_import
2
35
 
3
36
import SocketServer
4
37
import socket
5
 
import select
6
 
from optparse import OptionParser
 
38
import optparse
7
39
import datetime
8
40
import errno
9
41
import gnutls.crypto
10
42
import gnutls.connection
11
43
import gnutls.errors
 
44
import gnutls.library.functions
 
45
import gnutls.library.constants
 
46
import gnutls.library.types
12
47
import ConfigParser
13
48
import sys
14
 
 
15
 
 
16
 
class Client(object):
17
 
    def __init__(self, name=None, options=None, dn=None,
18
 
                 password=None, passfile=None, fqdn=None,
19
 
                 timeout=None, interval=-1):
20
 
        self.name = name
21
 
        self.dn = dn
22
 
        if password:
23
 
            self.password = password
24
 
        elif passfile:
25
 
            self.password = open(passfile).readall()
26
 
        else:
27
 
            print "No Password or Passfile in client config file"
28
 
            # raise RuntimeError XXX
29
 
            self.password = "gazonk"
30
 
        self.fqdn = fqdn
31
 
        self.created = datetime.datetime.now()
32
 
        self.last_seen = None
33
 
        if timeout is None:
34
 
            timeout = options.timeout
35
 
        self.timeout = timeout
36
 
        if interval == -1:
37
 
            interval = options.interval
38
 
        self.interval = interval
39
 
        self.next_check = datetime.datetime.now()
40
 
 
41
 
 
42
 
class server_metaclass(type):
43
 
    "Common behavior for the UDP and TCP server classes"
44
 
    def __new__(cls, name, bases, attrs):
45
 
        attrs["address_family"] = socket.AF_INET6
46
 
        attrs["allow_reuse_address"] = True
47
 
        def server_bind(self):
48
 
            if self.options.interface:
49
 
                if not hasattr(socket, "SO_BINDTODEVICE"):
50
 
                    # From /usr/include/asm-i486/socket.h
51
 
                    socket.SO_BINDTODEVICE = 25
 
49
import re
 
50
import os
 
51
import signal
 
52
from sets import Set
 
53
import subprocess
 
54
import atexit
 
55
import stat
 
56
import logging
 
57
import logging.handlers
 
58
import pwd
 
59
from contextlib import closing
 
60
 
 
61
import dbus
 
62
import dbus.service
 
63
import gobject
 
64
import avahi
 
65
from dbus.mainloop.glib import DBusGMainLoop
 
66
import ctypes
 
67
import ctypes.util
 
68
 
 
69
version = "1.0.5"
 
70
 
 
71
logger = logging.Logger('mandos')
 
72
syslogger = (logging.handlers.SysLogHandler
 
73
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
74
              address = "/dev/log"))
 
75
syslogger.setFormatter(logging.Formatter
 
76
                       ('Mandos: %(levelname)s: %(message)s'))
 
77
logger.addHandler(syslogger)
 
78
 
 
79
console = logging.StreamHandler()
 
80
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
 
81
                                       ' %(message)s'))
 
82
logger.addHandler(console)
 
83
 
 
84
class AvahiError(Exception):
 
85
    def __init__(self, value, *args, **kwargs):
 
86
        self.value = value
 
87
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
88
    def __unicode__(self):
 
89
        return unicode(repr(self.value))
 
90
 
 
91
class AvahiServiceError(AvahiError):
 
92
    pass
 
93
 
 
94
class AvahiGroupError(AvahiError):
 
95
    pass
 
96
 
 
97
 
 
98
class AvahiService(object):
 
99
    """An Avahi (Zeroconf) service.
 
100
    Attributes:
 
101
    interface: integer; avahi.IF_UNSPEC or an interface index.
 
102
               Used to optionally bind to the specified interface.
 
103
    name: string; Example: 'Mandos'
 
104
    type: string; Example: '_mandos._tcp'.
 
105
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
106
    port: integer; what port to announce
 
107
    TXT: list of strings; TXT record for the service
 
108
    domain: string; Domain to publish on, default to .local if empty.
 
109
    host: string; Host to publish records for, default is localhost
 
110
    max_renames: integer; maximum number of renames
 
111
    rename_count: integer; counter so we only rename after collisions
 
112
                  a sensible number of times
 
113
    """
 
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
115
                 servicetype = None, port = None, TXT = None,
 
116
                 domain = "", host = "", max_renames = 32768):
 
117
        self.interface = interface
 
118
        self.name = name
 
119
        self.type = servicetype
 
120
        self.port = port
 
121
        self.TXT = TXT if TXT is not None else []
 
122
        self.domain = domain
 
123
        self.host = host
 
124
        self.rename_count = 0
 
125
        self.max_renames = max_renames
 
126
    def rename(self):
 
127
        """Derived from the Avahi example code"""
 
128
        if self.rename_count >= self.max_renames:
 
129
            logger.critical(u"No suitable Zeroconf service name found"
 
130
                            u" after %i retries, exiting.",
 
131
                            self.rename_count)
 
132
            raise AvahiServiceError(u"Too many renames")
 
133
        self.name = server.GetAlternativeServiceName(self.name)
 
134
        logger.info(u"Changing Zeroconf service name to %r ...",
 
135
                    str(self.name))
 
136
        syslogger.setFormatter(logging.Formatter
 
137
                               ('Mandos (%s): %%(levelname)s:'
 
138
                                ' %%(message)s' % self.name))
 
139
        self.remove()
 
140
        self.add()
 
141
        self.rename_count += 1
 
142
    def remove(self):
 
143
        """Derived from the Avahi example code"""
 
144
        if group is not None:
 
145
            group.Reset()
 
146
    def add(self):
 
147
        """Derived from the Avahi example code"""
 
148
        global group
 
149
        if group is None:
 
150
            group = dbus.Interface(bus.get_object
 
151
                                   (avahi.DBUS_NAME,
 
152
                                    server.EntryGroupNew()),
 
153
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
154
            group.connect_to_signal('StateChanged',
 
155
                                    entry_group_state_changed)
 
156
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
157
                     service.name, service.type)
 
158
        group.AddService(
 
159
                self.interface,         # interface
 
160
                avahi.PROTO_INET6,      # protocol
 
161
                dbus.UInt32(0),         # flags
 
162
                self.name, self.type,
 
163
                self.domain, self.host,
 
164
                dbus.UInt16(self.port),
 
165
                avahi.string_array_to_txt_array(self.TXT))
 
166
        group.Commit()
 
167
 
 
168
# From the Avahi example code:
 
169
group = None                            # our entry group
 
170
# End of Avahi example code
 
171
 
 
172
 
 
173
def _datetime_to_dbus(dt, variant_level=0):
 
174
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
175
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
176
 
 
177
 
 
178
class Client(dbus.service.Object):
 
179
    """A representation of a client host served by this server.
 
180
    Attributes:
 
181
    name:       string; from the config file, used in log messages and
 
182
                        D-Bus identifiers
 
183
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
184
                 uniquely identify the client
 
185
    secret:     bytestring; sent verbatim (over TLS) to client
 
186
    host:       string; available for use by the checker command
 
187
    created:    datetime.datetime(); (UTC) object creation
 
188
    last_enabled: datetime.datetime(); (UTC)
 
189
    enabled:    bool()
 
190
    last_checked_ok: datetime.datetime(); (UTC) or None
 
191
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
192
                                      until this client is invalid
 
193
    interval:   datetime.timedelta(); How often to start a new checker
 
194
    disable_hook:  If set, called by disable() as disable_hook(self)
 
195
    checker:    subprocess.Popen(); a running checker process used
 
196
                                    to see if the client lives.
 
197
                                    'None' if no process is running.
 
198
    checker_initiator_tag: a gobject event source tag, or None
 
199
    disable_initiator_tag:    - '' -
 
200
    checker_callback_tag:  - '' -
 
201
    checker_command: string; External command which is run to check if
 
202
                     client lives.  %() expansions are done at
 
203
                     runtime with vars(self) as dict, so that for
 
204
                     instance %(name)s can be used in the command.
 
205
    use_dbus: bool(); Whether to provide D-Bus interface and signals
 
206
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
 
207
    """
 
208
    def timeout_milliseconds(self):
 
209
        "Return the 'timeout' attribute in milliseconds"
 
210
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
 
211
                + (self.timeout.seconds * 1000)
 
212
                + (self.timeout.microseconds // 1000))
 
213
    
 
214
    def interval_milliseconds(self):
 
215
        "Return the 'interval' attribute in milliseconds"
 
216
        return ((self.interval.days * 24 * 60 * 60 * 1000)
 
217
                + (self.interval.seconds * 1000)
 
218
                + (self.interval.microseconds // 1000))
 
219
    
 
220
    def __init__(self, name = None, disable_hook=None, config=None,
 
221
                 use_dbus=True):
 
222
        """Note: the 'checker' key in 'config' sets the
 
223
        'checker_command' attribute and *not* the 'checker'
 
224
        attribute."""
 
225
        self.name = name
 
226
        if config is None:
 
227
            config = {}
 
228
        logger.debug(u"Creating client %r", self.name)
 
229
        self.use_dbus = False   # During __init__
 
230
        # Uppercase and remove spaces from fingerprint for later
 
231
        # comparison purposes with return value from the fingerprint()
 
232
        # function
 
233
        self.fingerprint = (config["fingerprint"].upper()
 
234
                            .replace(u" ", u""))
 
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
236
        if "secret" in config:
 
237
            self.secret = config["secret"].decode(u"base64")
 
238
        elif "secfile" in config:
 
239
            with closing(open(os.path.expanduser
 
240
                              (os.path.expandvars
 
241
                               (config["secfile"])))) as secfile:
 
242
                self.secret = secfile.read()
 
243
        else:
 
244
            raise TypeError(u"No secret or secfile for client %s"
 
245
                            % self.name)
 
246
        self.host = config.get("host", "")
 
247
        self.created = datetime.datetime.utcnow()
 
248
        self.enabled = False
 
249
        self.last_enabled = None
 
250
        self.last_checked_ok = None
 
251
        self.timeout = string_to_delta(config["timeout"])
 
252
        self.interval = string_to_delta(config["interval"])
 
253
        self.disable_hook = disable_hook
 
254
        self.checker = None
 
255
        self.checker_initiator_tag = None
 
256
        self.disable_initiator_tag = None
 
257
        self.checker_callback_tag = None
 
258
        self.checker_command = config["checker"]
 
259
        self.last_connect = None
 
260
        # Only now, when this client is initialized, can it show up on
 
261
        # the D-Bus
 
262
        self.use_dbus = use_dbus
 
263
        if self.use_dbus:
 
264
            self.dbus_object_path = (dbus.ObjectPath
 
265
                                     ("/clients/"
 
266
                                      + self.name.replace(".", "_")))
 
267
            dbus.service.Object.__init__(self, bus,
 
268
                                         self.dbus_object_path)
 
269
    
 
270
    def enable(self):
 
271
        """Start this client's checker and timeout hooks"""
 
272
        self.last_enabled = datetime.datetime.utcnow()
 
273
        # Schedule a new checker to be started an 'interval' from now,
 
274
        # and every interval from then on.
 
275
        self.checker_initiator_tag = (gobject.timeout_add
 
276
                                      (self.interval_milliseconds(),
 
277
                                       self.start_checker))
 
278
        # Also start a new checker *right now*.
 
279
        self.start_checker()
 
280
        # Schedule a disable() when 'timeout' has passed
 
281
        self.disable_initiator_tag = (gobject.timeout_add
 
282
                                   (self.timeout_milliseconds(),
 
283
                                    self.disable))
 
284
        self.enabled = True
 
285
        if self.use_dbus:
 
286
            # Emit D-Bus signals
 
287
            self.PropertyChanged(dbus.String(u"enabled"),
 
288
                                 dbus.Boolean(True, variant_level=1))
 
289
            self.PropertyChanged(dbus.String(u"last_enabled"),
 
290
                                 (_datetime_to_dbus(self.last_enabled,
 
291
                                                    variant_level=1)))
 
292
    
 
293
    def disable(self):
 
294
        """Disable this client."""
 
295
        if not getattr(self, "enabled", False):
 
296
            return False
 
297
        logger.info(u"Disabling client %s", self.name)
 
298
        if getattr(self, "disable_initiator_tag", False):
 
299
            gobject.source_remove(self.disable_initiator_tag)
 
300
            self.disable_initiator_tag = None
 
301
        if getattr(self, "checker_initiator_tag", False):
 
302
            gobject.source_remove(self.checker_initiator_tag)
 
303
            self.checker_initiator_tag = None
 
304
        self.stop_checker()
 
305
        if self.disable_hook:
 
306
            self.disable_hook(self)
 
307
        self.enabled = False
 
308
        if self.use_dbus:
 
309
            # Emit D-Bus signal
 
310
            self.PropertyChanged(dbus.String(u"enabled"),
 
311
                                 dbus.Boolean(False, variant_level=1))
 
312
        # Do not run this again if called by a gobject.timeout_add
 
313
        return False
 
314
    
 
315
    def __del__(self):
 
316
        self.disable_hook = None
 
317
        self.disable()
 
318
    
 
319
    def checker_callback(self, pid, condition, command):
 
320
        """The checker has completed, so take appropriate actions."""
 
321
        self.checker_callback_tag = None
 
322
        self.checker = None
 
323
        if self.use_dbus:
 
324
            # Emit D-Bus signal
 
325
            self.PropertyChanged(dbus.String(u"checker_running"),
 
326
                                 dbus.Boolean(False, variant_level=1))
 
327
        if os.WIFEXITED(condition):
 
328
            exitstatus = os.WEXITSTATUS(condition)
 
329
            if exitstatus == 0:
 
330
                logger.info(u"Checker for %(name)s succeeded",
 
331
                            vars(self))
 
332
                self.checked_ok()
 
333
            else:
 
334
                logger.info(u"Checker for %(name)s failed",
 
335
                            vars(self))
 
336
            if self.use_dbus:
 
337
                # Emit D-Bus signal
 
338
                self.CheckerCompleted(dbus.Int16(exitstatus),
 
339
                                      dbus.Int64(condition),
 
340
                                      dbus.String(command))
 
341
        else:
 
342
            logger.warning(u"Checker for %(name)s crashed?",
 
343
                           vars(self))
 
344
            if self.use_dbus:
 
345
                # Emit D-Bus signal
 
346
                self.CheckerCompleted(dbus.Int16(-1),
 
347
                                      dbus.Int64(condition),
 
348
                                      dbus.String(command))
 
349
    
 
350
    def checked_ok(self):
 
351
        """Bump up the timeout for this client.
 
352
        This should only be called when the client has been seen,
 
353
        alive and well.
 
354
        """
 
355
        self.last_checked_ok = datetime.datetime.utcnow()
 
356
        gobject.source_remove(self.disable_initiator_tag)
 
357
        self.disable_initiator_tag = (gobject.timeout_add
 
358
                                      (self.timeout_milliseconds(),
 
359
                                       self.disable))
 
360
        if self.use_dbus:
 
361
            # Emit D-Bus signal
 
362
            self.PropertyChanged(
 
363
                dbus.String(u"last_checked_ok"),
 
364
                (_datetime_to_dbus(self.last_checked_ok,
 
365
                                   variant_level=1)))
 
366
    
 
367
    def start_checker(self):
 
368
        """Start a new checker subprocess if one is not running.
 
369
        If a checker already exists, leave it running and do
 
370
        nothing."""
 
371
        # The reason for not killing a running checker is that if we
 
372
        # did that, then if a checker (for some reason) started
 
373
        # running slowly and taking more than 'interval' time, the
 
374
        # client would inevitably timeout, since no checker would get
 
375
        # a chance to run to completion.  If we instead leave running
 
376
        # checkers alone, the checker would have to take more time
 
377
        # than 'timeout' for the client to be declared invalid, which
 
378
        # is as it should be.
 
379
        if self.checker is None:
 
380
            try:
 
381
                # In case checker_command has exactly one % operator
 
382
                command = self.checker_command % self.host
 
383
            except TypeError:
 
384
                # Escape attributes for the shell
 
385
                escaped_attrs = dict((key, re.escape(str(val)))
 
386
                                     for key, val in
 
387
                                     vars(self).iteritems())
52
388
                try:
53
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
54
 
                                           socket.SO_BINDTODEVICE,
55
 
                                           self.options.interface)
56
 
                except socket.error, error:
57
 
                    if error[0] == errno.EPERM:
58
 
                        print "Warning: No permission to bind to interface", \
59
 
                              self.options.interface
60
 
                    else:
61
 
                        raise error
62
 
            return super(type(self), self).server_bind()
63
 
        attrs["server_bind"] = server_bind
64
 
        def init(self, *args, **kwargs):
65
 
            if "options" in kwargs:
66
 
                self.options = kwargs["options"]
67
 
                del kwargs["options"]
68
 
            if "clients" in kwargs:
69
 
                self.clients = kwargs["clients"]
70
 
                del kwargs["clients"]
71
 
            if "credentials" in kwargs:
72
 
                self.credentials = kwargs["credentials"]
73
 
                del kwargs["credentials"]
74
 
            return super(type(self), self).__init__(*args, **kwargs)
75
 
        attrs["__init__"] = init
76
 
        return type.__new__(cls, name, bases, attrs)
77
 
 
78
 
 
79
 
class udp_handler(SocketServer.DatagramRequestHandler, object):
80
 
    def handle(self):
81
 
        self.wfile.write("Polo")
82
 
        print "UDP request answered"
83
 
 
84
 
 
85
 
class IPv6_UDPServer(SocketServer.UDPServer, object):
86
 
    __metaclass__ = server_metaclass
87
 
    def verify_request(self, request, client_address):
88
 
        print "UDP request came"
89
 
        return request[0] == "Marco"
90
 
 
91
 
 
92
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
93
 
    def handle(self):
94
 
        print "TCP request came"
95
 
        print "Request:", self.request
96
 
        print "Client Address:", self.client_address
97
 
        print "Server:", self.server
98
 
        session = gnutls.connection.ServerSession(self.request,
99
 
                                                  self.server.credentials)
100
 
        session.handshake()
101
 
        if session.peer_certificate:
102
 
            print "DN:", session.peer_certificate.subject
103
 
        try:
104
 
            session.verify_peer()
105
 
        except gnutls.errors.CertificateError, error:
106
 
            print "Verify failed", error
107
 
            session.bye()
108
 
            return
109
 
        try:
110
 
            session.send(dict((client.dn, client.password)
111
 
                              for client in self.server.clients)
112
 
                         [session.peer_certificate.subject])
113
 
        except KeyError:
114
 
            session.send("gazonk")
115
 
            # Log maybe? XXX
 
389
                    command = self.checker_command % escaped_attrs
 
390
                except TypeError, error:
 
391
                    logger.error(u'Could not format string "%s":'
 
392
                                 u' %s', self.checker_command, error)
 
393
                    return True # Try again later
 
394
            try:
 
395
                logger.info(u"Starting checker %r for %s",
 
396
                            command, self.name)
 
397
                # We don't need to redirect stdout and stderr, since
 
398
                # in normal mode, that is already done by daemon(),
 
399
                # and in debug mode we don't want to.  (Stdin is
 
400
                # always replaced by /dev/null.)
 
401
                self.checker = subprocess.Popen(command,
 
402
                                                close_fds=True,
 
403
                                                shell=True, cwd="/")
 
404
                if self.use_dbus:
 
405
                    # Emit D-Bus signal
 
406
                    self.CheckerStarted(command)
 
407
                    self.PropertyChanged(
 
408
                        dbus.String("checker_running"),
 
409
                        dbus.Boolean(True, variant_level=1))
 
410
                self.checker_callback_tag = (gobject.child_watch_add
 
411
                                             (self.checker.pid,
 
412
                                              self.checker_callback,
 
413
                                              data=command))
 
414
            except OSError, error:
 
415
                logger.error(u"Failed to start subprocess: %s",
 
416
                             error)
 
417
        # Re-run this periodically if run by gobject.timeout_add
 
418
        return True
 
419
    
 
420
    def stop_checker(self):
 
421
        """Force the checker process, if any, to stop."""
 
422
        if self.checker_callback_tag:
 
423
            gobject.source_remove(self.checker_callback_tag)
 
424
            self.checker_callback_tag = None
 
425
        if getattr(self, "checker", None) is None:
 
426
            return
 
427
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
428
        try:
 
429
            os.kill(self.checker.pid, signal.SIGTERM)
 
430
            #os.sleep(0.5)
 
431
            #if self.checker.poll() is None:
 
432
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
433
        except OSError, error:
 
434
            if error.errno != errno.ESRCH: # No such process
 
435
                raise
 
436
        self.checker = None
 
437
        if self.use_dbus:
 
438
            self.PropertyChanged(dbus.String(u"checker_running"),
 
439
                                 dbus.Boolean(False, variant_level=1))
 
440
    
 
441
    def still_valid(self):
 
442
        """Has the timeout not yet passed for this client?"""
 
443
        if not getattr(self, "enabled", False):
 
444
            return False
 
445
        now = datetime.datetime.utcnow()
 
446
        if self.last_checked_ok is None:
 
447
            return now < (self.created + self.timeout)
 
448
        else:
 
449
            return now < (self.last_checked_ok + self.timeout)
 
450
    
 
451
    ## D-Bus methods & signals
 
452
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
453
    
 
454
    # CheckedOK - method
 
455
    CheckedOK = dbus.service.method(_interface)(checked_ok)
 
456
    CheckedOK.__name__ = "CheckedOK"
 
457
    
 
458
    # CheckerCompleted - signal
 
459
    @dbus.service.signal(_interface, signature="nxs")
 
460
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
461
        "D-Bus signal"
 
462
        pass
 
463
    
 
464
    # CheckerStarted - signal
 
465
    @dbus.service.signal(_interface, signature="s")
 
466
    def CheckerStarted(self, command):
 
467
        "D-Bus signal"
 
468
        pass
 
469
    
 
470
    # GetAllProperties - method
 
471
    @dbus.service.method(_interface, out_signature="a{sv}")
 
472
    def GetAllProperties(self):
 
473
        "D-Bus method"
 
474
        return dbus.Dictionary({
 
475
                dbus.String("name"):
 
476
                    dbus.String(self.name, variant_level=1),
 
477
                dbus.String("fingerprint"):
 
478
                    dbus.String(self.fingerprint, variant_level=1),
 
479
                dbus.String("host"):
 
480
                    dbus.String(self.host, variant_level=1),
 
481
                dbus.String("created"):
 
482
                    _datetime_to_dbus(self.created, variant_level=1),
 
483
                dbus.String("last_enabled"):
 
484
                    (_datetime_to_dbus(self.last_enabled,
 
485
                                       variant_level=1)
 
486
                     if self.last_enabled is not None
 
487
                     else dbus.Boolean(False, variant_level=1)),
 
488
                dbus.String("enabled"):
 
489
                    dbus.Boolean(self.enabled, variant_level=1),
 
490
                dbus.String("last_checked_ok"):
 
491
                    (_datetime_to_dbus(self.last_checked_ok,
 
492
                                       variant_level=1)
 
493
                     if self.last_checked_ok is not None
 
494
                     else dbus.Boolean (False, variant_level=1)),
 
495
                dbus.String("timeout"):
 
496
                    dbus.UInt64(self.timeout_milliseconds(),
 
497
                                variant_level=1),
 
498
                dbus.String("interval"):
 
499
                    dbus.UInt64(self.interval_milliseconds(),
 
500
                                variant_level=1),
 
501
                dbus.String("checker"):
 
502
                    dbus.String(self.checker_command,
 
503
                                variant_level=1),
 
504
                dbus.String("checker_running"):
 
505
                    dbus.Boolean(self.checker is not None,
 
506
                                 variant_level=1),
 
507
                dbus.String("object_path"):
 
508
                    dbus.ObjectPath(self.dbus_object_path,
 
509
                                    variant_level=1)
 
510
                }, signature="sv")
 
511
    
 
512
    # IsStillValid - method
 
513
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
 
514
                    (still_valid))
 
515
    IsStillValid.__name__ = "IsStillValid"
 
516
    
 
517
    # PropertyChanged - signal
 
518
    @dbus.service.signal(_interface, signature="sv")
 
519
    def PropertyChanged(self, property, value):
 
520
        "D-Bus signal"
 
521
        pass
 
522
    
 
523
    # SetChecker - method
 
524
    @dbus.service.method(_interface, in_signature="s")
 
525
    def SetChecker(self, checker):
 
526
        "D-Bus setter method"
 
527
        self.checker_command = checker
 
528
        # Emit D-Bus signal
 
529
        self.PropertyChanged(dbus.String(u"checker"),
 
530
                             dbus.String(self.checker_command,
 
531
                                         variant_level=1))
 
532
    
 
533
    # SetHost - method
 
534
    @dbus.service.method(_interface, in_signature="s")
 
535
    def SetHost(self, host):
 
536
        "D-Bus setter method"
 
537
        self.host = host
 
538
        # Emit D-Bus signal
 
539
        self.PropertyChanged(dbus.String(u"host"),
 
540
                             dbus.String(self.host, variant_level=1))
 
541
    
 
542
    # SetInterval - method
 
543
    @dbus.service.method(_interface, in_signature="t")
 
544
    def SetInterval(self, milliseconds):
 
545
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
 
546
        # Emit D-Bus signal
 
547
        self.PropertyChanged(dbus.String(u"interval"),
 
548
                             (dbus.UInt64(self.interval_milliseconds(),
 
549
                                          variant_level=1)))
 
550
    
 
551
    # SetSecret - method
 
552
    @dbus.service.method(_interface, in_signature="ay",
 
553
                         byte_arrays=True)
 
554
    def SetSecret(self, secret):
 
555
        "D-Bus setter method"
 
556
        self.secret = str(secret)
 
557
    
 
558
    # SetTimeout - method
 
559
    @dbus.service.method(_interface, in_signature="t")
 
560
    def SetTimeout(self, milliseconds):
 
561
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
562
        # Emit D-Bus signal
 
563
        self.PropertyChanged(dbus.String(u"timeout"),
 
564
                             (dbus.UInt64(self.timeout_milliseconds(),
 
565
                                          variant_level=1)))
 
566
    
 
567
    # Enable - method
 
568
    Enable = dbus.service.method(_interface)(enable)
 
569
    Enable.__name__ = "Enable"
 
570
    
 
571
    # StartChecker - method
 
572
    @dbus.service.method(_interface)
 
573
    def StartChecker(self):
 
574
        "D-Bus method"
 
575
        self.start_checker()
 
576
    
 
577
    # Disable - method
 
578
    @dbus.service.method(_interface)
 
579
    def Disable(self):
 
580
        "D-Bus method"
 
581
        self.disable()
 
582
    
 
583
    # StopChecker - method
 
584
    StopChecker = dbus.service.method(_interface)(stop_checker)
 
585
    StopChecker.__name__ = "StopChecker"
 
586
    
 
587
    del _interface
 
588
 
 
589
 
 
590
def peer_certificate(session):
 
591
    "Return the peer's OpenPGP certificate as a bytestring"
 
592
    # If not an OpenPGP certificate...
 
593
    if (gnutls.library.functions
 
594
        .gnutls_certificate_type_get(session._c_object)
 
595
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
596
        # ...do the normal thing
 
597
        return session.peer_certificate
 
598
    list_size = ctypes.c_uint(1)
 
599
    cert_list = (gnutls.library.functions
 
600
                 .gnutls_certificate_get_peers
 
601
                 (session._c_object, ctypes.byref(list_size)))
 
602
    if not bool(cert_list) and list_size.value != 0:
 
603
        raise gnutls.errors.GNUTLSError("error getting peer"
 
604
                                        " certificate")
 
605
    if list_size.value == 0:
 
606
        return None
 
607
    cert = cert_list[0]
 
608
    return ctypes.string_at(cert.data, cert.size)
 
609
 
 
610
 
 
611
def fingerprint(openpgp):
 
612
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
613
    # New GnuTLS "datum" with the OpenPGP public key
 
614
    datum = (gnutls.library.types
 
615
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
616
                                         ctypes.POINTER
 
617
                                         (ctypes.c_ubyte)),
 
618
                             ctypes.c_uint(len(openpgp))))
 
619
    # New empty GnuTLS certificate
 
620
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
621
    (gnutls.library.functions
 
622
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
623
    # Import the OpenPGP public key into the certificate
 
624
    (gnutls.library.functions
 
625
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
626
                                gnutls.library.constants
 
627
                                .GNUTLS_OPENPGP_FMT_RAW))
 
628
    # Verify the self signature in the key
 
629
    crtverify = ctypes.c_uint()
 
630
    (gnutls.library.functions
 
631
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
632
    if crtverify.value != 0:
 
633
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
634
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
635
    # New buffer for the fingerprint
 
636
    buf = ctypes.create_string_buffer(20)
 
637
    buf_len = ctypes.c_size_t()
 
638
    # Get the fingerprint from the certificate into the buffer
 
639
    (gnutls.library.functions
 
640
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
641
                                         ctypes.byref(buf_len)))
 
642
    # Deinit the certificate
 
643
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
644
    # Convert the buffer to a Python bytestring
 
645
    fpr = ctypes.string_at(buf, buf_len.value)
 
646
    # Convert the bytestring to hexadecimal notation
 
647
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
648
    return hex_fpr
 
649
 
 
650
 
 
651
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
652
    """A TCP request handler class.
 
653
    Instantiated by IPv6_TCPServer for each request to handle it.
 
654
    Note: This will run in its own forked process."""
 
655
    
 
656
    def handle(self):
 
657
        logger.info(u"TCP connection from: %s",
 
658
                    unicode(self.client_address))
 
659
        session = (gnutls.connection
 
660
                   .ClientSession(self.request,
 
661
                                  gnutls.connection
 
662
                                  .X509Credentials()))
 
663
        
 
664
        line = self.request.makefile().readline()
 
665
        logger.debug(u"Protocol version: %r", line)
 
666
        try:
 
667
            if int(line.strip().split()[0]) > 1:
 
668
                raise RuntimeError
 
669
        except (ValueError, IndexError, RuntimeError), error:
 
670
            logger.error(u"Unknown protocol version: %s", error)
 
671
            return
 
672
        
 
673
        # Note: gnutls.connection.X509Credentials is really a generic
 
674
        # GnuTLS certificate credentials object so long as no X.509
 
675
        # keys are added to it.  Therefore, we can use it here despite
 
676
        # using OpenPGP certificates.
 
677
        
 
678
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
679
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
680
        #                "+DHE-DSS"))
 
681
        # Use a fallback default, since this MUST be set.
 
682
        priority = self.server.settings.get("priority", "NORMAL")
 
683
        (gnutls.library.functions
 
684
         .gnutls_priority_set_direct(session._c_object,
 
685
                                     priority, None))
 
686
        
 
687
        try:
 
688
            session.handshake()
 
689
        except gnutls.errors.GNUTLSError, error:
 
690
            logger.warning(u"Handshake failed: %s", error)
 
691
            # Do not run session.bye() here: the session is not
 
692
            # established.  Just abandon the request.
 
693
            return
 
694
        logger.debug(u"Handshake succeeded")
 
695
        try:
 
696
            fpr = fingerprint(peer_certificate(session))
 
697
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
698
            logger.warning(u"Bad certificate: %s", error)
 
699
            session.bye()
 
700
            return
 
701
        logger.debug(u"Fingerprint: %s", fpr)
 
702
        
 
703
        for c in self.server.clients:
 
704
            if c.fingerprint == fpr:
 
705
                client = c
 
706
                break
 
707
        else:
 
708
            logger.warning(u"Client not found for fingerprint: %s",
 
709
                           fpr)
 
710
            session.bye()
 
711
            return
 
712
        # Have to check if client.still_valid(), since it is possible
 
713
        # that the client timed out while establishing the GnuTLS
 
714
        # session.
 
715
        if not client.still_valid():
 
716
            logger.warning(u"Client %(name)s is invalid",
 
717
                           vars(client))
 
718
            session.bye()
 
719
            return
 
720
        ## This won't work here, since we're in a fork.
 
721
        # client.checked_ok()
 
722
        sent_size = 0
 
723
        while sent_size < len(client.secret):
 
724
            sent = session.send(client.secret[sent_size:])
 
725
            logger.debug(u"Sent: %d, remaining: %d",
 
726
                         sent, len(client.secret)
 
727
                         - (sent_size + sent))
 
728
            sent_size += sent
116
729
        session.bye()
117
730
 
118
731
 
119
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
120
 
    __metaclass__ = server_metaclass
121
 
    request_queue_size = 1024
122
 
 
123
 
 
124
 
in6addr_any = "::"
125
 
 
126
 
cred = None
 
732
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
733
                     SocketServer.TCPServer, object):
 
734
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
735
    Attributes:
 
736
        settings:       Server settings
 
737
        clients:        Set() of Client objects
 
738
        enabled:        Boolean; whether this server is activated yet
 
739
    """
 
740
    address_family = socket.AF_INET6
 
741
    def __init__(self, *args, **kwargs):
 
742
        if "settings" in kwargs:
 
743
            self.settings = kwargs["settings"]
 
744
            del kwargs["settings"]
 
745
        if "clients" in kwargs:
 
746
            self.clients = kwargs["clients"]
 
747
            del kwargs["clients"]
 
748
        self.enabled = False
 
749
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
750
    def server_bind(self):
 
751
        """This overrides the normal server_bind() function
 
752
        to bind to an interface if one was specified, and also NOT to
 
753
        bind to an address or port if they were not specified."""
 
754
        if self.settings["interface"]:
 
755
            # 25 is from /usr/include/asm-i486/socket.h
 
756
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
757
            try:
 
758
                self.socket.setsockopt(socket.SOL_SOCKET,
 
759
                                       SO_BINDTODEVICE,
 
760
                                       self.settings["interface"])
 
761
            except socket.error, error:
 
762
                if error[0] == errno.EPERM:
 
763
                    logger.error(u"No permission to"
 
764
                                 u" bind to interface %s",
 
765
                                 self.settings["interface"])
 
766
                else:
 
767
                    raise error
 
768
        # Only bind(2) the socket if we really need to.
 
769
        if self.server_address[0] or self.server_address[1]:
 
770
            if not self.server_address[0]:
 
771
                in6addr_any = "::"
 
772
                self.server_address = (in6addr_any,
 
773
                                       self.server_address[1])
 
774
            elif not self.server_address[1]:
 
775
                self.server_address = (self.server_address[0],
 
776
                                       0)
 
777
#                 if self.settings["interface"]:
 
778
#                     self.server_address = (self.server_address[0],
 
779
#                                            0, # port
 
780
#                                            0, # flowinfo
 
781
#                                            if_nametoindex
 
782
#                                            (self.settings
 
783
#                                             ["interface"]))
 
784
            return super(IPv6_TCPServer, self).server_bind()
 
785
    def server_activate(self):
 
786
        if self.enabled:
 
787
            return super(IPv6_TCPServer, self).server_activate()
 
788
    def enable(self):
 
789
        self.enabled = True
 
790
 
127
791
 
128
792
def string_to_delta(interval):
129
793
    """Parse a string and return a datetime.timedelta
130
 
 
 
794
    
131
795
    >>> string_to_delta('7d')
132
796
    datetime.timedelta(7)
133
797
    >>> string_to_delta('60s')
138
802
    datetime.timedelta(1)
139
803
    >>> string_to_delta(u'1w')
140
804
    datetime.timedelta(7)
 
805
    >>> string_to_delta('5m 30s')
 
806
    datetime.timedelta(0, 330)
141
807
    """
142
 
    try:
143
 
        suffix=unicode(interval[-1])
144
 
        value=int(interval[:-1])
145
 
        if suffix == u"d":
146
 
            delta = datetime.timedelta(value)
147
 
        elif suffix == u"s":
148
 
            delta = datetime.timedelta(0, value)
149
 
        elif suffix == u"m":
150
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
151
 
        elif suffix == u"h":
152
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
153
 
        elif suffix == u"w":
154
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
155
 
        else:
 
808
    timevalue = datetime.timedelta(0)
 
809
    for s in interval.split():
 
810
        try:
 
811
            suffix = unicode(s[-1])
 
812
            value = int(s[:-1])
 
813
            if suffix == u"d":
 
814
                delta = datetime.timedelta(value)
 
815
            elif suffix == u"s":
 
816
                delta = datetime.timedelta(0, value)
 
817
            elif suffix == u"m":
 
818
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
819
            elif suffix == u"h":
 
820
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
821
            elif suffix == u"w":
 
822
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
823
            else:
 
824
                raise ValueError
 
825
        except (ValueError, IndexError):
156
826
            raise ValueError
157
 
    except (ValueError, IndexError):
158
 
        raise ValueError
159
 
    return delta
 
827
        timevalue += delta
 
828
    return timevalue
 
829
 
 
830
 
 
831
def server_state_changed(state):
 
832
    """Derived from the Avahi example code"""
 
833
    if state == avahi.SERVER_COLLISION:
 
834
        logger.error(u"Zeroconf server name collision")
 
835
        service.remove()
 
836
    elif state == avahi.SERVER_RUNNING:
 
837
        service.add()
 
838
 
 
839
 
 
840
def entry_group_state_changed(state, error):
 
841
    """Derived from the Avahi example code"""
 
842
    logger.debug(u"Avahi state change: %i", state)
 
843
    
 
844
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
845
        logger.debug(u"Zeroconf service established.")
 
846
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
847
        logger.warning(u"Zeroconf service name collision.")
 
848
        service.rename()
 
849
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
850
        logger.critical(u"Avahi: Error in group state changed %s",
 
851
                        unicode(error))
 
852
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
853
 
 
854
def if_nametoindex(interface):
 
855
    """Call the C function if_nametoindex(), or equivalent"""
 
856
    global if_nametoindex
 
857
    try:
 
858
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
859
                          (ctypes.util.find_library("c"))
 
860
                          .if_nametoindex)
 
861
    except (OSError, AttributeError):
 
862
        if "struct" not in sys.modules:
 
863
            import struct
 
864
        if "fcntl" not in sys.modules:
 
865
            import fcntl
 
866
        def if_nametoindex(interface):
 
867
            "Get an interface index the hard way, i.e. using fcntl()"
 
868
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
869
            with closing(socket.socket()) as s:
 
870
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
871
                                    struct.pack("16s16x", interface))
 
872
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
873
            return interface_index
 
874
    return if_nametoindex(interface)
 
875
 
 
876
 
 
877
def daemon(nochdir = False, noclose = False):
 
878
    """See daemon(3).  Standard BSD Unix function.
 
879
    This should really exist as os.daemon, but it doesn't (yet)."""
 
880
    if os.fork():
 
881
        sys.exit()
 
882
    os.setsid()
 
883
    if not nochdir:
 
884
        os.chdir("/")
 
885
    if os.fork():
 
886
        sys.exit()
 
887
    if not noclose:
 
888
        # Close all standard open file descriptors
 
889
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
890
        if not stat.S_ISCHR(os.fstat(null).st_mode):
 
891
            raise OSError(errno.ENODEV,
 
892
                          "/dev/null not a character device")
 
893
        os.dup2(null, sys.stdin.fileno())
 
894
        os.dup2(null, sys.stdout.fileno())
 
895
        os.dup2(null, sys.stderr.fileno())
 
896
        if null > 2:
 
897
            os.close(null)
 
898
 
160
899
 
161
900
def main():
162
 
    parser = OptionParser()
 
901
    parser = optparse.OptionParser(version = "%%prog %s" % version)
163
902
    parser.add_option("-i", "--interface", type="string",
164
 
                      default="eth0", metavar="IF",
165
 
                      help="Interface to bind to")
166
 
    parser.add_option("--cert", type="string", default="cert.pem",
167
 
                      metavar="FILE",
168
 
                      help="Public key certificate to use")
169
 
    parser.add_option("--key", type="string", default="key.pem",
170
 
                      metavar="FILE",
171
 
                      help="Private key to use")
172
 
    parser.add_option("--ca", type="string", default="ca.pem",
173
 
                      metavar="FILE",
174
 
                      help="Certificate Authority certificate to use")
175
 
    parser.add_option("--crl", type="string", default="crl.pem",
176
 
                      metavar="FILE",
177
 
                      help="Certificate Revokation List to use")
178
 
    parser.add_option("-p", "--port", type="int", default=49001,
 
903
                      metavar="IF", help="Bind to interface IF")
 
904
    parser.add_option("-a", "--address", type="string",
 
905
                      help="Address to listen for requests on")
 
906
    parser.add_option("-p", "--port", type="int",
179
907
                      help="Port number to receive requests on")
180
 
    parser.add_option("--dh", type="int", metavar="BITS",
181
 
                      help="DH group to use")
182
 
    parser.add_option("-t", "--timeout", type="string", # Parsed later
183
 
                      default="15m",
184
 
                      help="Amount of downtime allowed for clients")
185
 
    parser.add_option("--interval", type="string", # Parsed later
186
 
                      default="5m",
187
 
                      help="How often to check that a client is up")
188
 
    parser.add_option("--check", action="store_true", default=False,
 
908
    parser.add_option("--check", action="store_true",
189
909
                      help="Run self-test")
190
 
    (options, args) = parser.parse_args()
191
 
 
 
910
    parser.add_option("--debug", action="store_true",
 
911
                      help="Debug mode; run in foreground and log to"
 
912
                      " terminal")
 
913
    parser.add_option("--priority", type="string", help="GnuTLS"
 
914
                      " priority string (see GnuTLS documentation)")
 
915
    parser.add_option("--servicename", type="string", metavar="NAME",
 
916
                      help="Zeroconf service name")
 
917
    parser.add_option("--configdir", type="string",
 
918
                      default="/etc/mandos", metavar="DIR",
 
919
                      help="Directory to search for configuration"
 
920
                      " files")
 
921
    parser.add_option("--no-dbus", action="store_false",
 
922
                      dest="use_dbus",
 
923
                      help="Do not provide D-Bus system bus"
 
924
                      " interface")
 
925
    options = parser.parse_args()[0]
 
926
    
192
927
    if options.check:
193
928
        import doctest
194
929
        doctest.testmod()
195
930
        sys.exit()
196
931
    
197
 
    # Parse the time arguments
198
 
    try:
199
 
        options.timeout = string_to_delta(options.timeout)
200
 
    except ValueError:
201
 
        parser.error("option --timeout: Unparseable time")
202
 
    
203
 
    try:
204
 
        options.interval = string_to_delta(options.interval)
205
 
    except ValueError:
206
 
        parser.error("option --interval: Unparseable time")
207
 
    
208
 
    cert = gnutls.crypto.X509Certificate(open(options.cert).read())
209
 
    key = gnutls.crypto.X509PrivateKey(open(options.key).read())
210
 
    ca = gnutls.crypto.X509Certificate(open(options.ca).read())
211
 
    crl = gnutls.crypto.X509CRL(open(options.crl).read())
212
 
    cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
213
 
    
214
 
    # Parse config file
215
 
    defaults = {}
216
 
    client_config_object = ConfigParser.SafeConfigParser(defaults)
217
 
    client_config_object.read("mandos-clients.conf")
218
 
    clients = [Client(name=section, options=options,
219
 
                      **(dict(client_config_object.items(section))))
220
 
               for section in client_config_object.sections()]
221
 
    
222
 
    udp_server = IPv6_UDPServer((in6addr_any, options.port),
223
 
                                udp_handler,
224
 
                                options=options)
225
 
    
226
 
    tcp_server = IPv6_TCPServer((in6addr_any, options.port),
227
 
                                tcp_handler,
228
 
                                options=options,
229
 
                                clients=clients,
230
 
                                credentials=cred)
231
 
    
232
 
    while True:
233
 
        in_, out, err = select.select((udp_server,
234
 
                                       tcp_server), (), ())
235
 
        for server in in_:
236
 
            server.handle_request()
237
 
 
238
 
 
239
 
if __name__ == "__main__":
 
932
    # Default values for config file for server-global settings
 
933
    server_defaults = { "interface": "",
 
934
                        "address": "",
 
935
                        "port": "",
 
936
                        "debug": "False",
 
937
                        "priority":
 
938
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
939
                        "servicename": "Mandos",
 
940
                        "use_dbus": "True",
 
941
                        }
 
942
    
 
943
    # Parse config file for server-global settings
 
944
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
945
    del server_defaults
 
946
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
947
    # Convert the SafeConfigParser object to a dict
 
948
    server_settings = server_config.defaults()
 
949
    # Use the appropriate methods on the non-string config options
 
950
    server_settings["debug"] = server_config.getboolean("DEFAULT",
 
951
                                                        "debug")
 
952
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
 
953
                                                           "use_dbus")
 
954
    if server_settings["port"]:
 
955
        server_settings["port"] = server_config.getint("DEFAULT",
 
956
                                                       "port")
 
957
    del server_config
 
958
    
 
959
    # Override the settings from the config file with command line
 
960
    # options, if set.
 
961
    for option in ("interface", "address", "port", "debug",
 
962
                   "priority", "servicename", "configdir",
 
963
                   "use_dbus"):
 
964
        value = getattr(options, option)
 
965
        if value is not None:
 
966
            server_settings[option] = value
 
967
    del options
 
968
    # Now we have our good server settings in "server_settings"
 
969
    
 
970
    # For convenience
 
971
    debug = server_settings["debug"]
 
972
    use_dbus = server_settings["use_dbus"]
 
973
 
 
974
    def sigsegvhandler(signum, frame):
 
975
        raise RuntimeError('Segmentation fault')
 
976
    
 
977
    if not debug:
 
978
        syslogger.setLevel(logging.WARNING)
 
979
        console.setLevel(logging.WARNING)
 
980
    else:
 
981
        signal.signal(signal.SIGSEGV, sigsegvhandler)
 
982
    
 
983
    if server_settings["servicename"] != "Mandos":
 
984
        syslogger.setFormatter(logging.Formatter
 
985
                               ('Mandos (%s): %%(levelname)s:'
 
986
                                ' %%(message)s'
 
987
                                % server_settings["servicename"]))
 
988
    
 
989
    # Parse config file with clients
 
990
    client_defaults = { "timeout": "1h",
 
991
                        "interval": "5m",
 
992
                        "checker": "fping -q -- %%(host)s",
 
993
                        "host": "",
 
994
                        }
 
995
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
996
    client_config.read(os.path.join(server_settings["configdir"],
 
997
                                    "clients.conf"))
 
998
    
 
999
    clients = Set()
 
1000
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
1001
                                 server_settings["port"]),
 
1002
                                TCP_handler,
 
1003
                                settings=server_settings,
 
1004
                                clients=clients)
 
1005
    pidfilename = "/var/run/mandos.pid"
 
1006
    try:
 
1007
        pidfile = open(pidfilename, "w")
 
1008
    except IOError, error:
 
1009
        logger.error("Could not open file %r", pidfilename)
 
1010
    
 
1011
    try:
 
1012
        uid = pwd.getpwnam("_mandos").pw_uid
 
1013
        gid = pwd.getpwnam("_mandos").pw_gid
 
1014
    except KeyError:
 
1015
        try:
 
1016
            uid = pwd.getpwnam("mandos").pw_uid
 
1017
            gid = pwd.getpwnam("mandos").pw_gid
 
1018
        except KeyError:
 
1019
            try:
 
1020
                uid = pwd.getpwnam("nobody").pw_uid
 
1021
                gid = pwd.getpwnam("nogroup").pw_gid
 
1022
            except KeyError:
 
1023
                uid = 65534
 
1024
                gid = 65534
 
1025
    try:
 
1026
        os.setgid(gid)
 
1027
        os.setuid(uid)
 
1028
    except OSError, error:
 
1029
        if error[0] != errno.EPERM:
 
1030
            raise error
 
1031
    
 
1032
    # Enable all possible GnuTLS debugging
 
1033
    if debug:
 
1034
        # "Use a log level over 10 to enable all debugging options."
 
1035
        # - GnuTLS manual
 
1036
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1037
        
 
1038
        @gnutls.library.types.gnutls_log_func
 
1039
        def debug_gnutls(level, string):
 
1040
            logger.debug("GnuTLS: %s", string[:-1])
 
1041
        
 
1042
        (gnutls.library.functions
 
1043
         .gnutls_global_set_log_function(debug_gnutls))
 
1044
    
 
1045
    global service
 
1046
    service = AvahiService(name = server_settings["servicename"],
 
1047
                           servicetype = "_mandos._tcp", )
 
1048
    if server_settings["interface"]:
 
1049
        service.interface = (if_nametoindex
 
1050
                             (server_settings["interface"]))
 
1051
    
 
1052
    global main_loop
 
1053
    global bus
 
1054
    global server
 
1055
    # From the Avahi example code
 
1056
    DBusGMainLoop(set_as_default=True )
 
1057
    main_loop = gobject.MainLoop()
 
1058
    bus = dbus.SystemBus()
 
1059
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
1060
                                           avahi.DBUS_PATH_SERVER),
 
1061
                            avahi.DBUS_INTERFACE_SERVER)
 
1062
    # End of Avahi example code
 
1063
    if use_dbus:
 
1064
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1065
    
 
1066
    clients.update(Set(Client(name = section,
 
1067
                              config
 
1068
                              = dict(client_config.items(section)),
 
1069
                              use_dbus = use_dbus)
 
1070
                       for section in client_config.sections()))
 
1071
    if not clients:
 
1072
        logger.warning(u"No clients defined")
 
1073
    
 
1074
    if debug:
 
1075
        # Redirect stdin so all checkers get /dev/null
 
1076
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1077
        os.dup2(null, sys.stdin.fileno())
 
1078
        if null > 2:
 
1079
            os.close(null)
 
1080
    else:
 
1081
        # No console logging
 
1082
        logger.removeHandler(console)
 
1083
        # Close all input and output, do double fork, etc.
 
1084
        daemon()
 
1085
    
 
1086
    try:
 
1087
        pid = os.getpid()
 
1088
        pidfile.write(str(pid) + "\n")
 
1089
        pidfile.close()
 
1090
        del pidfile
 
1091
    except IOError:
 
1092
        logger.error(u"Could not write to file %r with PID %d",
 
1093
                     pidfilename, pid)
 
1094
    except NameError:
 
1095
        # "pidfile" was never created
 
1096
        pass
 
1097
    del pidfilename
 
1098
    
 
1099
    def cleanup():
 
1100
        "Cleanup function; run on exit"
 
1101
        global group
 
1102
        # From the Avahi example code
 
1103
        if not group is None:
 
1104
            group.Free()
 
1105
            group = None
 
1106
        # End of Avahi example code
 
1107
        
 
1108
        while clients:
 
1109
            client = clients.pop()
 
1110
            client.disable_hook = None
 
1111
            client.disable()
 
1112
    
 
1113
    atexit.register(cleanup)
 
1114
    
 
1115
    if not debug:
 
1116
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1117
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1118
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1119
    
 
1120
    if use_dbus:
 
1121
        class MandosServer(dbus.service.Object):
 
1122
            """A D-Bus proxy object"""
 
1123
            def __init__(self):
 
1124
                dbus.service.Object.__init__(self, bus, "/")
 
1125
            _interface = u"se.bsnet.fukt.Mandos"
 
1126
            
 
1127
            @dbus.service.signal(_interface, signature="oa{sv}")
 
1128
            def ClientAdded(self, objpath, properties):
 
1129
                "D-Bus signal"
 
1130
                pass
 
1131
            
 
1132
            @dbus.service.signal(_interface, signature="os")
 
1133
            def ClientRemoved(self, objpath, name):
 
1134
                "D-Bus signal"
 
1135
                pass
 
1136
            
 
1137
            @dbus.service.method(_interface, out_signature="ao")
 
1138
            def GetAllClients(self):
 
1139
                "D-Bus method"
 
1140
                return dbus.Array(c.dbus_object_path for c in clients)
 
1141
            
 
1142
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
 
1143
            def GetAllClientsWithProperties(self):
 
1144
                "D-Bus method"
 
1145
                return dbus.Dictionary(
 
1146
                    ((c.dbus_object_path, c.GetAllProperties())
 
1147
                     for c in clients),
 
1148
                    signature="oa{sv}")
 
1149
            
 
1150
            @dbus.service.method(_interface, in_signature="o")
 
1151
            def RemoveClient(self, object_path):
 
1152
                "D-Bus method"
 
1153
                for c in clients:
 
1154
                    if c.dbus_object_path == object_path:
 
1155
                        clients.remove(c)
 
1156
                        # Don't signal anything except ClientRemoved
 
1157
                        c.use_dbus = False
 
1158
                        c.disable()
 
1159
                        # Emit D-Bus signal
 
1160
                        self.ClientRemoved(object_path, c.name)
 
1161
                        return
 
1162
                raise KeyError
 
1163
            
 
1164
            del _interface
 
1165
        
 
1166
        mandos_server = MandosServer()
 
1167
    
 
1168
    for client in clients:
 
1169
        if use_dbus:
 
1170
            # Emit D-Bus signal
 
1171
            mandos_server.ClientAdded(client.dbus_object_path,
 
1172
                                      client.GetAllProperties())
 
1173
        client.enable()
 
1174
    
 
1175
    tcp_server.enable()
 
1176
    tcp_server.server_activate()
 
1177
    
 
1178
    # Find out what port we got
 
1179
    service.port = tcp_server.socket.getsockname()[1]
 
1180
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
1181
                u" scope_id %d" % tcp_server.socket.getsockname())
 
1182
    
 
1183
    #service.interface = tcp_server.socket.getsockname()[3]
 
1184
    
 
1185
    try:
 
1186
        # From the Avahi example code
 
1187
        server.connect_to_signal("StateChanged", server_state_changed)
 
1188
        try:
 
1189
            server_state_changed(server.GetState())
 
1190
        except dbus.exceptions.DBusException, error:
 
1191
            logger.critical(u"DBusException: %s", error)
 
1192
            sys.exit(1)
 
1193
        # End of Avahi example code
 
1194
        
 
1195
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
1196
                             lambda *args, **kwargs:
 
1197
                             (tcp_server.handle_request
 
1198
                              (*args[2:], **kwargs) or True))
 
1199
        
 
1200
        logger.debug(u"Starting main loop")
 
1201
        main_loop.run()
 
1202
    except AvahiError, error:
 
1203
        logger.critical(u"AvahiError: %s", error)
 
1204
        sys.exit(1)
 
1205
    except KeyboardInterrupt:
 
1206
        if debug:
 
1207
            print
 
1208
 
 
1209
if __name__ == '__main__':
240
1210
    main()
241