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  • Committer: Teddy Hogeborn
  • Date: 2009-02-07 04:50:39 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
                                   "/scripts/local-top/mandos" to
                                   "/scripts/init-premount/mandos".
  (uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".

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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
 
class Client(object):
16
 
    def __init__(self, name=None, dn=None, password=None,
17
 
                 passfile=None, fqdn=None, timeout=None,
18
 
                 interval=-1):
19
 
        self.name = name
20
 
        self.dn = dn
21
 
        if password:
22
 
            self.password = password
23
 
        elif passfile:
24
 
            self.password = open(passfile).readall()
 
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 [%(process)d]: %(levelname)s:'
 
77
                        ' %(message)s'))
 
78
logger.addHandler(syslogger)
 
79
 
 
80
console = logging.StreamHandler()
 
81
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
 
82
                                       ' %(levelname)s: %(message)s'))
 
83
logger.addHandler(console)
 
84
 
 
85
class AvahiError(Exception):
 
86
    def __init__(self, value, *args, **kwargs):
 
87
        self.value = value
 
88
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
89
    def __unicode__(self):
 
90
        return unicode(repr(self.value))
 
91
 
 
92
class AvahiServiceError(AvahiError):
 
93
    pass
 
94
 
 
95
class AvahiGroupError(AvahiError):
 
96
    pass
 
97
 
 
98
 
 
99
class AvahiService(object):
 
100
    """An Avahi (Zeroconf) service.
 
101
    Attributes:
 
102
    interface: integer; avahi.IF_UNSPEC or an interface index.
 
103
               Used to optionally bind to the specified interface.
 
104
    name: string; Example: 'Mandos'
 
105
    type: string; Example: '_mandos._tcp'.
 
106
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
107
    port: integer; what port to announce
 
108
    TXT: list of strings; TXT record for the service
 
109
    domain: string; Domain to publish on, default to .local if empty.
 
110
    host: string; Host to publish records for, default is localhost
 
111
    max_renames: integer; maximum number of renames
 
112
    rename_count: integer; counter so we only rename after collisions
 
113
                  a sensible number of times
 
114
    """
 
115
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
 
116
                 servicetype = None, port = None, TXT = None,
 
117
                 domain = "", host = "", max_renames = 32768):
 
118
        self.interface = interface
 
119
        self.name = name
 
120
        self.type = servicetype
 
121
        self.port = port
 
122
        self.TXT = TXT if TXT is not None else []
 
123
        self.domain = domain
 
124
        self.host = host
 
125
        self.rename_count = 0
 
126
        self.max_renames = max_renames
 
127
    def rename(self):
 
128
        """Derived from the Avahi example code"""
 
129
        if self.rename_count >= self.max_renames:
 
130
            logger.critical(u"No suitable Zeroconf service name found"
 
131
                            u" after %i retries, exiting.",
 
132
                            self.rename_count)
 
133
            raise AvahiServiceError(u"Too many renames")
 
134
        self.name = server.GetAlternativeServiceName(self.name)
 
135
        logger.info(u"Changing Zeroconf service name to %r ...",
 
136
                    str(self.name))
 
137
        syslogger.setFormatter(logging.Formatter
 
138
                               ('Mandos (%s): %%(levelname)s:'
 
139
                                ' %%(message)s' % self.name))
 
140
        self.remove()
 
141
        self.add()
 
142
        self.rename_count += 1
 
143
    def remove(self):
 
144
        """Derived from the Avahi example code"""
 
145
        if group is not None:
 
146
            group.Reset()
 
147
    def add(self):
 
148
        """Derived from the Avahi example code"""
 
149
        global group
 
150
        if group is None:
 
151
            group = dbus.Interface(bus.get_object
 
152
                                   (avahi.DBUS_NAME,
 
153
                                    server.EntryGroupNew()),
 
154
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
155
            group.connect_to_signal('StateChanged',
 
156
                                    entry_group_state_changed)
 
157
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
158
                     service.name, service.type)
 
159
        group.AddService(
 
160
                self.interface,         # interface
 
161
                avahi.PROTO_INET6,      # protocol
 
162
                dbus.UInt32(0),         # flags
 
163
                self.name, self.type,
 
164
                self.domain, self.host,
 
165
                dbus.UInt16(self.port),
 
166
                avahi.string_array_to_txt_array(self.TXT))
 
167
        group.Commit()
 
168
 
 
169
# From the Avahi example code:
 
170
group = None                            # our entry group
 
171
# End of Avahi example code
 
172
 
 
173
 
 
174
def _datetime_to_dbus(dt, variant_level=0):
 
175
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
176
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
177
 
 
178
 
 
179
class Client(dbus.service.Object):
 
180
    """A representation of a client host served by this server.
 
181
    Attributes:
 
182
    name:       string; from the config file, used in log messages and
 
183
                        D-Bus identifiers
 
184
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
185
                 uniquely identify the client
 
186
    secret:     bytestring; sent verbatim (over TLS) to client
 
187
    host:       string; available for use by the checker command
 
188
    created:    datetime.datetime(); (UTC) object creation
 
189
    last_enabled: datetime.datetime(); (UTC)
 
190
    enabled:    bool()
 
191
    last_checked_ok: datetime.datetime(); (UTC) or None
 
192
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
193
                                      until this client is invalid
 
194
    interval:   datetime.timedelta(); How often to start a new checker
 
195
    disable_hook:  If set, called by disable() as disable_hook(self)
 
196
    checker:    subprocess.Popen(); a running checker process used
 
197
                                    to see if the client lives.
 
198
                                    'None' if no process is running.
 
199
    checker_initiator_tag: a gobject event source tag, or None
 
200
    disable_initiator_tag:    - '' -
 
201
    checker_callback_tag:  - '' -
 
202
    checker_command: string; External command which is run to check if
 
203
                     client lives.  %() expansions are done at
 
204
                     runtime with vars(self) as dict, so that for
 
205
                     instance %(name)s can be used in the command.
 
206
    use_dbus: bool(); Whether to provide D-Bus interface and signals
 
207
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
 
208
    """
 
209
    def timeout_milliseconds(self):
 
210
        "Return the 'timeout' attribute in milliseconds"
 
211
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
 
212
                + (self.timeout.seconds * 1000)
 
213
                + (self.timeout.microseconds // 1000))
 
214
    
 
215
    def interval_milliseconds(self):
 
216
        "Return the 'interval' attribute in milliseconds"
 
217
        return ((self.interval.days * 24 * 60 * 60 * 1000)
 
218
                + (self.interval.seconds * 1000)
 
219
                + (self.interval.microseconds // 1000))
 
220
    
 
221
    def __init__(self, name = None, disable_hook=None, config=None,
 
222
                 use_dbus=True):
 
223
        """Note: the 'checker' key in 'config' sets the
 
224
        'checker_command' attribute and *not* the 'checker'
 
225
        attribute."""
 
226
        self.name = name
 
227
        if config is None:
 
228
            config = {}
 
229
        logger.debug(u"Creating client %r", self.name)
 
230
        self.use_dbus = False   # During __init__
 
231
        # Uppercase and remove spaces from fingerprint for later
 
232
        # comparison purposes with return value from the fingerprint()
 
233
        # function
 
234
        self.fingerprint = (config["fingerprint"].upper()
 
235
                            .replace(u" ", u""))
 
236
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
237
        if "secret" in config:
 
238
            self.secret = config["secret"].decode(u"base64")
 
239
        elif "secfile" in config:
 
240
            with closing(open(os.path.expanduser
 
241
                              (os.path.expandvars
 
242
                               (config["secfile"])))) as secfile:
 
243
                self.secret = secfile.read()
25
244
        else:
26
 
            print "No Password or Passfile in client config file"
27
 
            # raise RuntimeError XXX
28
 
            self.password = "gazonk"
29
 
        self.fqdn = fqdn
30
 
        self.created = datetime.datetime.now()
31
 
        self.last_seen = None
32
 
        if timeout is None:
33
 
            timeout = self.server.options.timeout
34
 
        self.timeout = timeout
35
 
        if interval == -1:
36
 
            interval = self.server.options.interval
37
 
        self.interval = interval
38
 
        self.next_check = datetime.datetime.now()
39
 
 
40
 
def server_bind(self):
41
 
    if self.options.interface:
42
 
        if not hasattr(socket, "SO_BINDTODEVICE"):
43
 
            # From /usr/include/asm-i486/socket.h
44
 
            socket.SO_BINDTODEVICE = 25
45
 
        try:
46
 
            self.socket.setsockopt(socket.SOL_SOCKET,
47
 
                                   socket.SO_BINDTODEVICE,
48
 
                                   self.options.interface)
49
 
        except socket.error, error:
50
 
            if error[0] == errno.EPERM:
51
 
                print "Warning: Denied permission to bind to interface", \
52
 
                      self.options.interface
 
245
            raise TypeError(u"No secret or secfile for client %s"
 
246
                            % self.name)
 
247
        self.host = config.get("host", "")
 
248
        self.created = datetime.datetime.utcnow()
 
249
        self.enabled = False
 
250
        self.last_enabled = None
 
251
        self.last_checked_ok = None
 
252
        self.timeout = string_to_delta(config["timeout"])
 
253
        self.interval = string_to_delta(config["interval"])
 
254
        self.disable_hook = disable_hook
 
255
        self.checker = None
 
256
        self.checker_initiator_tag = None
 
257
        self.disable_initiator_tag = None
 
258
        self.checker_callback_tag = None
 
259
        self.checker_command = config["checker"]
 
260
        self.last_connect = None
 
261
        # Only now, when this client is initialized, can it show up on
 
262
        # the D-Bus
 
263
        self.use_dbus = use_dbus
 
264
        if self.use_dbus:
 
265
            self.dbus_object_path = (dbus.ObjectPath
 
266
                                     ("/clients/"
 
267
                                      + self.name.replace(".", "_")))
 
268
            dbus.service.Object.__init__(self, bus,
 
269
                                         self.dbus_object_path)
 
270
    
 
271
    def enable(self):
 
272
        """Start this client's checker and timeout hooks"""
 
273
        self.last_enabled = datetime.datetime.utcnow()
 
274
        # Schedule a new checker to be started an 'interval' from now,
 
275
        # and every interval from then on.
 
276
        self.checker_initiator_tag = (gobject.timeout_add
 
277
                                      (self.interval_milliseconds(),
 
278
                                       self.start_checker))
 
279
        # Also start a new checker *right now*.
 
280
        self.start_checker()
 
281
        # Schedule a disable() when 'timeout' has passed
 
282
        self.disable_initiator_tag = (gobject.timeout_add
 
283
                                   (self.timeout_milliseconds(),
 
284
                                    self.disable))
 
285
        self.enabled = True
 
286
        if self.use_dbus:
 
287
            # Emit D-Bus signals
 
288
            self.PropertyChanged(dbus.String(u"enabled"),
 
289
                                 dbus.Boolean(True, variant_level=1))
 
290
            self.PropertyChanged(dbus.String(u"last_enabled"),
 
291
                                 (_datetime_to_dbus(self.last_enabled,
 
292
                                                    variant_level=1)))
 
293
    
 
294
    def disable(self):
 
295
        """Disable this client."""
 
296
        if not getattr(self, "enabled", False):
 
297
            return False
 
298
        logger.info(u"Disabling client %s", self.name)
 
299
        if getattr(self, "disable_initiator_tag", False):
 
300
            gobject.source_remove(self.disable_initiator_tag)
 
301
            self.disable_initiator_tag = None
 
302
        if getattr(self, "checker_initiator_tag", False):
 
303
            gobject.source_remove(self.checker_initiator_tag)
 
304
            self.checker_initiator_tag = None
 
305
        self.stop_checker()
 
306
        if self.disable_hook:
 
307
            self.disable_hook(self)
 
308
        self.enabled = False
 
309
        if self.use_dbus:
 
310
            # Emit D-Bus signal
 
311
            self.PropertyChanged(dbus.String(u"enabled"),
 
312
                                 dbus.Boolean(False, variant_level=1))
 
313
        # Do not run this again if called by a gobject.timeout_add
 
314
        return False
 
315
    
 
316
    def __del__(self):
 
317
        self.disable_hook = None
 
318
        self.disable()
 
319
    
 
320
    def checker_callback(self, pid, condition, command):
 
321
        """The checker has completed, so take appropriate actions."""
 
322
        self.checker_callback_tag = None
 
323
        self.checker = None
 
324
        if self.use_dbus:
 
325
            # Emit D-Bus signal
 
326
            self.PropertyChanged(dbus.String(u"checker_running"),
 
327
                                 dbus.Boolean(False, variant_level=1))
 
328
        if os.WIFEXITED(condition):
 
329
            exitstatus = os.WEXITSTATUS(condition)
 
330
            if exitstatus == 0:
 
331
                logger.info(u"Checker for %(name)s succeeded",
 
332
                            vars(self))
 
333
                self.checked_ok()
53
334
            else:
54
 
                raise error
55
 
    return super(type(self), self).server_bind()
56
 
 
57
 
 
58
 
def init_with_options(self, *args, **kwargs):
59
 
    if "options" in kwargs:
60
 
        self.options = kwargs["options"]
61
 
        del kwargs["options"]
62
 
    if "clients" in kwargs:
63
 
        self.clients = kwargs["clients"]
64
 
        del kwargs["clients"]
65
 
    if "credentials" in kwargs:
66
 
        self.credentials = kwargs["credentials"]
67
 
        del kwargs["credentials"]
68
 
    return super(type(self), self).__init__(*args, **kwargs)
69
 
 
70
 
 
71
 
class udp_handler(SocketServer.DatagramRequestHandler, object):
72
 
    def handle(self):
73
 
        self.wfile.write("Polo")
74
 
        print "UDP request answered"
75
 
 
76
 
 
77
 
class IPv6_UDPServer(SocketServer.UDPServer, object):
78
 
    __init__ = init_with_options
79
 
    address_family = socket.AF_INET6
80
 
    allow_reuse_address = True
81
 
    server_bind = server_bind
82
 
    def verify_request(self, request, client_address):
83
 
        print "UDP request came"
84
 
        return request[0] == "Marco"
85
 
 
86
 
 
87
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
88
 
    def handle(self):
89
 
        print "TCP request came"
90
 
        print "Request:", self.request
91
 
        print "Client Address:", self.client_address
92
 
        print "Server:", self.server
93
 
        session = gnutls.connection.ServerSession(self.request,
94
 
                                                  self.server.credentials)
95
 
        session.handshake()
96
 
        if session.peer_certificate:
97
 
            print "DN:", session.peer_certificate.subject
98
 
        try:
99
 
            session.verify_peer()
100
 
        except gnutls.errors.CertificateError, error:
101
 
            print "Verify failed", error
102
 
            session.bye()
103
 
            return
104
 
        try:
105
 
            session.send(dict((client.dn, client.password)
106
 
                              for client in self.server.clients)
107
 
                         [session.peer_certificate.subject])
108
 
        except KeyError:
109
 
            session.send("gazonk")
110
 
            # Log maybe? XXX
 
335
                logger.info(u"Checker for %(name)s failed",
 
336
                            vars(self))
 
337
            if self.use_dbus:
 
338
                # Emit D-Bus signal
 
339
                self.CheckerCompleted(dbus.Int16(exitstatus),
 
340
                                      dbus.Int64(condition),
 
341
                                      dbus.String(command))
 
342
        else:
 
343
            logger.warning(u"Checker for %(name)s crashed?",
 
344
                           vars(self))
 
345
            if self.use_dbus:
 
346
                # Emit D-Bus signal
 
347
                self.CheckerCompleted(dbus.Int16(-1),
 
348
                                      dbus.Int64(condition),
 
349
                                      dbus.String(command))
 
350
    
 
351
    def checked_ok(self):
 
352
        """Bump up the timeout for this client.
 
353
        This should only be called when the client has been seen,
 
354
        alive and well.
 
355
        """
 
356
        self.last_checked_ok = datetime.datetime.utcnow()
 
357
        gobject.source_remove(self.disable_initiator_tag)
 
358
        self.disable_initiator_tag = (gobject.timeout_add
 
359
                                      (self.timeout_milliseconds(),
 
360
                                       self.disable))
 
361
        if self.use_dbus:
 
362
            # Emit D-Bus signal
 
363
            self.PropertyChanged(
 
364
                dbus.String(u"last_checked_ok"),
 
365
                (_datetime_to_dbus(self.last_checked_ok,
 
366
                                   variant_level=1)))
 
367
    
 
368
    def start_checker(self):
 
369
        """Start a new checker subprocess if one is not running.
 
370
        If a checker already exists, leave it running and do
 
371
        nothing."""
 
372
        # The reason for not killing a running checker is that if we
 
373
        # did that, then if a checker (for some reason) started
 
374
        # running slowly and taking more than 'interval' time, the
 
375
        # client would inevitably timeout, since no checker would get
 
376
        # a chance to run to completion.  If we instead leave running
 
377
        # checkers alone, the checker would have to take more time
 
378
        # than 'timeout' for the client to be declared invalid, which
 
379
        # is as it should be.
 
380
        if self.checker is None:
 
381
            try:
 
382
                # In case checker_command has exactly one % operator
 
383
                command = self.checker_command % self.host
 
384
            except TypeError:
 
385
                # Escape attributes for the shell
 
386
                escaped_attrs = dict((key, re.escape(str(val)))
 
387
                                     for key, val in
 
388
                                     vars(self).iteritems())
 
389
                try:
 
390
                    command = self.checker_command % escaped_attrs
 
391
                except TypeError, error:
 
392
                    logger.error(u'Could not format string "%s":'
 
393
                                 u' %s', self.checker_command, error)
 
394
                    return True # Try again later
 
395
            try:
 
396
                logger.info(u"Starting checker %r for %s",
 
397
                            command, self.name)
 
398
                # We don't need to redirect stdout and stderr, since
 
399
                # in normal mode, that is already done by daemon(),
 
400
                # and in debug mode we don't want to.  (Stdin is
 
401
                # always replaced by /dev/null.)
 
402
                self.checker = subprocess.Popen(command,
 
403
                                                close_fds=True,
 
404
                                                shell=True, cwd="/")
 
405
                if self.use_dbus:
 
406
                    # Emit D-Bus signal
 
407
                    self.CheckerStarted(command)
 
408
                    self.PropertyChanged(
 
409
                        dbus.String("checker_running"),
 
410
                        dbus.Boolean(True, variant_level=1))
 
411
                self.checker_callback_tag = (gobject.child_watch_add
 
412
                                             (self.checker.pid,
 
413
                                              self.checker_callback,
 
414
                                              data=command))
 
415
            except OSError, error:
 
416
                logger.error(u"Failed to start subprocess: %s",
 
417
                             error)
 
418
        # Re-run this periodically if run by gobject.timeout_add
 
419
        return True
 
420
    
 
421
    def stop_checker(self):
 
422
        """Force the checker process, if any, to stop."""
 
423
        if self.checker_callback_tag:
 
424
            gobject.source_remove(self.checker_callback_tag)
 
425
            self.checker_callback_tag = None
 
426
        if getattr(self, "checker", None) is None:
 
427
            return
 
428
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
429
        try:
 
430
            os.kill(self.checker.pid, signal.SIGTERM)
 
431
            #os.sleep(0.5)
 
432
            #if self.checker.poll() is None:
 
433
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
434
        except OSError, error:
 
435
            if error.errno != errno.ESRCH: # No such process
 
436
                raise
 
437
        self.checker = None
 
438
        if self.use_dbus:
 
439
            self.PropertyChanged(dbus.String(u"checker_running"),
 
440
                                 dbus.Boolean(False, variant_level=1))
 
441
    
 
442
    def still_valid(self):
 
443
        """Has the timeout not yet passed for this client?"""
 
444
        if not getattr(self, "enabled", False):
 
445
            return False
 
446
        now = datetime.datetime.utcnow()
 
447
        if self.last_checked_ok is None:
 
448
            return now < (self.created + self.timeout)
 
449
        else:
 
450
            return now < (self.last_checked_ok + self.timeout)
 
451
    
 
452
    ## D-Bus methods & signals
 
453
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
454
    
 
455
    # CheckedOK - method
 
456
    CheckedOK = dbus.service.method(_interface)(checked_ok)
 
457
    CheckedOK.__name__ = "CheckedOK"
 
458
    
 
459
    # CheckerCompleted - signal
 
460
    @dbus.service.signal(_interface, signature="nxs")
 
461
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
462
        "D-Bus signal"
 
463
        pass
 
464
    
 
465
    # CheckerStarted - signal
 
466
    @dbus.service.signal(_interface, signature="s")
 
467
    def CheckerStarted(self, command):
 
468
        "D-Bus signal"
 
469
        pass
 
470
    
 
471
    # GetAllProperties - method
 
472
    @dbus.service.method(_interface, out_signature="a{sv}")
 
473
    def GetAllProperties(self):
 
474
        "D-Bus method"
 
475
        return dbus.Dictionary({
 
476
                dbus.String("name"):
 
477
                    dbus.String(self.name, variant_level=1),
 
478
                dbus.String("fingerprint"):
 
479
                    dbus.String(self.fingerprint, variant_level=1),
 
480
                dbus.String("host"):
 
481
                    dbus.String(self.host, variant_level=1),
 
482
                dbus.String("created"):
 
483
                    _datetime_to_dbus(self.created, variant_level=1),
 
484
                dbus.String("last_enabled"):
 
485
                    (_datetime_to_dbus(self.last_enabled,
 
486
                                       variant_level=1)
 
487
                     if self.last_enabled is not None
 
488
                     else dbus.Boolean(False, variant_level=1)),
 
489
                dbus.String("enabled"):
 
490
                    dbus.Boolean(self.enabled, variant_level=1),
 
491
                dbus.String("last_checked_ok"):
 
492
                    (_datetime_to_dbus(self.last_checked_ok,
 
493
                                       variant_level=1)
 
494
                     if self.last_checked_ok is not None
 
495
                     else dbus.Boolean (False, variant_level=1)),
 
496
                dbus.String("timeout"):
 
497
                    dbus.UInt64(self.timeout_milliseconds(),
 
498
                                variant_level=1),
 
499
                dbus.String("interval"):
 
500
                    dbus.UInt64(self.interval_milliseconds(),
 
501
                                variant_level=1),
 
502
                dbus.String("checker"):
 
503
                    dbus.String(self.checker_command,
 
504
                                variant_level=1),
 
505
                dbus.String("checker_running"):
 
506
                    dbus.Boolean(self.checker is not None,
 
507
                                 variant_level=1),
 
508
                dbus.String("object_path"):
 
509
                    dbus.ObjectPath(self.dbus_object_path,
 
510
                                    variant_level=1)
 
511
                }, signature="sv")
 
512
    
 
513
    # IsStillValid - method
 
514
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
 
515
                    (still_valid))
 
516
    IsStillValid.__name__ = "IsStillValid"
 
517
    
 
518
    # PropertyChanged - signal
 
519
    @dbus.service.signal(_interface, signature="sv")
 
520
    def PropertyChanged(self, property, value):
 
521
        "D-Bus signal"
 
522
        pass
 
523
    
 
524
    # SetChecker - method
 
525
    @dbus.service.method(_interface, in_signature="s")
 
526
    def SetChecker(self, checker):
 
527
        "D-Bus setter method"
 
528
        self.checker_command = checker
 
529
        # Emit D-Bus signal
 
530
        self.PropertyChanged(dbus.String(u"checker"),
 
531
                             dbus.String(self.checker_command,
 
532
                                         variant_level=1))
 
533
    
 
534
    # SetHost - method
 
535
    @dbus.service.method(_interface, in_signature="s")
 
536
    def SetHost(self, host):
 
537
        "D-Bus setter method"
 
538
        self.host = host
 
539
        # Emit D-Bus signal
 
540
        self.PropertyChanged(dbus.String(u"host"),
 
541
                             dbus.String(self.host, variant_level=1))
 
542
    
 
543
    # SetInterval - method
 
544
    @dbus.service.method(_interface, in_signature="t")
 
545
    def SetInterval(self, milliseconds):
 
546
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
 
547
        # Emit D-Bus signal
 
548
        self.PropertyChanged(dbus.String(u"interval"),
 
549
                             (dbus.UInt64(self.interval_milliseconds(),
 
550
                                          variant_level=1)))
 
551
    
 
552
    # SetSecret - method
 
553
    @dbus.service.method(_interface, in_signature="ay",
 
554
                         byte_arrays=True)
 
555
    def SetSecret(self, secret):
 
556
        "D-Bus setter method"
 
557
        self.secret = str(secret)
 
558
    
 
559
    # SetTimeout - method
 
560
    @dbus.service.method(_interface, in_signature="t")
 
561
    def SetTimeout(self, milliseconds):
 
562
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
563
        # Emit D-Bus signal
 
564
        self.PropertyChanged(dbus.String(u"timeout"),
 
565
                             (dbus.UInt64(self.timeout_milliseconds(),
 
566
                                          variant_level=1)))
 
567
    
 
568
    # Enable - method
 
569
    Enable = dbus.service.method(_interface)(enable)
 
570
    Enable.__name__ = "Enable"
 
571
    
 
572
    # StartChecker - method
 
573
    @dbus.service.method(_interface)
 
574
    def StartChecker(self):
 
575
        "D-Bus method"
 
576
        self.start_checker()
 
577
    
 
578
    # Disable - method
 
579
    @dbus.service.method(_interface)
 
580
    def Disable(self):
 
581
        "D-Bus method"
 
582
        self.disable()
 
583
    
 
584
    # StopChecker - method
 
585
    StopChecker = dbus.service.method(_interface)(stop_checker)
 
586
    StopChecker.__name__ = "StopChecker"
 
587
    
 
588
    del _interface
 
589
 
 
590
 
 
591
def peer_certificate(session):
 
592
    "Return the peer's OpenPGP certificate as a bytestring"
 
593
    # If not an OpenPGP certificate...
 
594
    if (gnutls.library.functions
 
595
        .gnutls_certificate_type_get(session._c_object)
 
596
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
597
        # ...do the normal thing
 
598
        return session.peer_certificate
 
599
    list_size = ctypes.c_uint(1)
 
600
    cert_list = (gnutls.library.functions
 
601
                 .gnutls_certificate_get_peers
 
602
                 (session._c_object, ctypes.byref(list_size)))
 
603
    if not bool(cert_list) and list_size.value != 0:
 
604
        raise gnutls.errors.GNUTLSError("error getting peer"
 
605
                                        " certificate")
 
606
    if list_size.value == 0:
 
607
        return None
 
608
    cert = cert_list[0]
 
609
    return ctypes.string_at(cert.data, cert.size)
 
610
 
 
611
 
 
612
def fingerprint(openpgp):
 
613
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
614
    # New GnuTLS "datum" with the OpenPGP public key
 
615
    datum = (gnutls.library.types
 
616
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
617
                                         ctypes.POINTER
 
618
                                         (ctypes.c_ubyte)),
 
619
                             ctypes.c_uint(len(openpgp))))
 
620
    # New empty GnuTLS certificate
 
621
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
622
    (gnutls.library.functions
 
623
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
624
    # Import the OpenPGP public key into the certificate
 
625
    (gnutls.library.functions
 
626
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
627
                                gnutls.library.constants
 
628
                                .GNUTLS_OPENPGP_FMT_RAW))
 
629
    # Verify the self signature in the key
 
630
    crtverify = ctypes.c_uint()
 
631
    (gnutls.library.functions
 
632
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
633
    if crtverify.value != 0:
 
634
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
635
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
636
    # New buffer for the fingerprint
 
637
    buf = ctypes.create_string_buffer(20)
 
638
    buf_len = ctypes.c_size_t()
 
639
    # Get the fingerprint from the certificate into the buffer
 
640
    (gnutls.library.functions
 
641
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
642
                                         ctypes.byref(buf_len)))
 
643
    # Deinit the certificate
 
644
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
645
    # Convert the buffer to a Python bytestring
 
646
    fpr = ctypes.string_at(buf, buf_len.value)
 
647
    # Convert the bytestring to hexadecimal notation
 
648
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
649
    return hex_fpr
 
650
 
 
651
 
 
652
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
653
    """A TCP request handler class.
 
654
    Instantiated by IPv6_TCPServer for each request to handle it.
 
655
    Note: This will run in its own forked process."""
 
656
    
 
657
    def handle(self):
 
658
        logger.info(u"TCP connection from: %s",
 
659
                    unicode(self.client_address))
 
660
        session = (gnutls.connection
 
661
                   .ClientSession(self.request,
 
662
                                  gnutls.connection
 
663
                                  .X509Credentials()))
 
664
        
 
665
        line = self.request.makefile().readline()
 
666
        logger.debug(u"Protocol version: %r", line)
 
667
        try:
 
668
            if int(line.strip().split()[0]) > 1:
 
669
                raise RuntimeError
 
670
        except (ValueError, IndexError, RuntimeError), error:
 
671
            logger.error(u"Unknown protocol version: %s", error)
 
672
            return
 
673
        
 
674
        # Note: gnutls.connection.X509Credentials is really a generic
 
675
        # GnuTLS certificate credentials object so long as no X.509
 
676
        # keys are added to it.  Therefore, we can use it here despite
 
677
        # using OpenPGP certificates.
 
678
        
 
679
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
680
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
681
        #                     "+DHE-DSS"))
 
682
        # Use a fallback default, since this MUST be set.
 
683
        priority = self.server.settings.get("priority", "NORMAL")
 
684
        (gnutls.library.functions
 
685
         .gnutls_priority_set_direct(session._c_object,
 
686
                                     priority, None))
 
687
        
 
688
        try:
 
689
            session.handshake()
 
690
        except gnutls.errors.GNUTLSError, error:
 
691
            logger.warning(u"Handshake failed: %s", error)
 
692
            # Do not run session.bye() here: the session is not
 
693
            # established.  Just abandon the request.
 
694
            return
 
695
        logger.debug(u"Handshake succeeded")
 
696
        try:
 
697
            fpr = fingerprint(peer_certificate(session))
 
698
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
699
            logger.warning(u"Bad certificate: %s", error)
 
700
            session.bye()
 
701
            return
 
702
        logger.debug(u"Fingerprint: %s", fpr)
 
703
        
 
704
        for c in self.server.clients:
 
705
            if c.fingerprint == fpr:
 
706
                client = c
 
707
                break
 
708
        else:
 
709
            logger.warning(u"Client not found for fingerprint: %s",
 
710
                           fpr)
 
711
            session.bye()
 
712
            return
 
713
        # Have to check if client.still_valid(), since it is possible
 
714
        # that the client timed out while establishing the GnuTLS
 
715
        # session.
 
716
        if not client.still_valid():
 
717
            logger.warning(u"Client %(name)s is invalid",
 
718
                           vars(client))
 
719
            session.bye()
 
720
            return
 
721
        ## This won't work here, since we're in a fork.
 
722
        # client.checked_ok()
 
723
        sent_size = 0
 
724
        while sent_size < len(client.secret):
 
725
            sent = session.send(client.secret[sent_size:])
 
726
            logger.debug(u"Sent: %d, remaining: %d",
 
727
                         sent, len(client.secret)
 
728
                         - (sent_size + sent))
 
729
            sent_size += sent
111
730
        session.bye()
112
731
 
113
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
114
 
    __init__ = init_with_options
 
732
 
 
733
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
734
                     SocketServer.TCPServer, object):
 
735
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
736
    Attributes:
 
737
        settings:       Server settings
 
738
        clients:        Set() of Client objects
 
739
        enabled:        Boolean; whether this server is activated yet
 
740
    """
115
741
    address_family = socket.AF_INET6
116
 
    allow_reuse_address = True
117
 
    request_queue_size = 1024
118
 
    server_bind = server_bind
119
 
 
120
 
 
121
 
in6addr_any = "::"
122
 
 
123
 
cred = None
 
742
    def __init__(self, *args, **kwargs):
 
743
        if "settings" in kwargs:
 
744
            self.settings = kwargs["settings"]
 
745
            del kwargs["settings"]
 
746
        if "clients" in kwargs:
 
747
            self.clients = kwargs["clients"]
 
748
            del kwargs["clients"]
 
749
        self.enabled = False
 
750
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
751
    def server_bind(self):
 
752
        """This overrides the normal server_bind() function
 
753
        to bind to an interface if one was specified, and also NOT to
 
754
        bind to an address or port if they were not specified."""
 
755
        if self.settings["interface"]:
 
756
            # 25 is from /usr/include/asm-i486/socket.h
 
757
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
758
            try:
 
759
                self.socket.setsockopt(socket.SOL_SOCKET,
 
760
                                       SO_BINDTODEVICE,
 
761
                                       self.settings["interface"])
 
762
            except socket.error, error:
 
763
                if error[0] == errno.EPERM:
 
764
                    logger.error(u"No permission to"
 
765
                                 u" bind to interface %s",
 
766
                                 self.settings["interface"])
 
767
                else:
 
768
                    raise
 
769
        # Only bind(2) the socket if we really need to.
 
770
        if self.server_address[0] or self.server_address[1]:
 
771
            if not self.server_address[0]:
 
772
                in6addr_any = "::"
 
773
                self.server_address = (in6addr_any,
 
774
                                       self.server_address[1])
 
775
            elif not self.server_address[1]:
 
776
                self.server_address = (self.server_address[0],
 
777
                                       0)
 
778
#                 if self.settings["interface"]:
 
779
#                     self.server_address = (self.server_address[0],
 
780
#                                            0, # port
 
781
#                                            0, # flowinfo
 
782
#                                            if_nametoindex
 
783
#                                            (self.settings
 
784
#                                             ["interface"]))
 
785
            return super(IPv6_TCPServer, self).server_bind()
 
786
    def server_activate(self):
 
787
        if self.enabled:
 
788
            return super(IPv6_TCPServer, self).server_activate()
 
789
    def enable(self):
 
790
        self.enabled = True
 
791
 
124
792
 
125
793
def string_to_delta(interval):
126
794
    """Parse a string and return a datetime.timedelta
127
 
 
 
795
    
128
796
    >>> string_to_delta('7d')
129
797
    datetime.timedelta(7)
130
798
    >>> string_to_delta('60s')
135
803
    datetime.timedelta(1)
136
804
    >>> string_to_delta(u'1w')
137
805
    datetime.timedelta(7)
 
806
    >>> string_to_delta('5m 30s')
 
807
    datetime.timedelta(0, 330)
138
808
    """
139
 
    try:
140
 
        suffix=unicode(interval[-1])
141
 
        value=int(interval[:-1])
142
 
        if suffix == u"d":
143
 
            delta = datetime.timedelta(value)
144
 
        elif suffix == u"s":
145
 
            delta = datetime.timedelta(0, value)
146
 
        elif suffix == u"m":
147
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
148
 
        elif suffix == u"h":
149
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
150
 
        elif suffix == u"w":
151
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
152
 
        else:
 
809
    timevalue = datetime.timedelta(0)
 
810
    for s in interval.split():
 
811
        try:
 
812
            suffix = unicode(s[-1])
 
813
            value = int(s[:-1])
 
814
            if suffix == u"d":
 
815
                delta = datetime.timedelta(value)
 
816
            elif suffix == u"s":
 
817
                delta = datetime.timedelta(0, value)
 
818
            elif suffix == u"m":
 
819
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
820
            elif suffix == u"h":
 
821
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
822
            elif suffix == u"w":
 
823
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
824
            else:
 
825
                raise ValueError
 
826
        except (ValueError, IndexError):
153
827
            raise ValueError
154
 
    except (ValueError, IndexError):
155
 
        raise ValueError
156
 
    return delta
 
828
        timevalue += delta
 
829
    return timevalue
 
830
 
 
831
 
 
832
def server_state_changed(state):
 
833
    """Derived from the Avahi example code"""
 
834
    if state == avahi.SERVER_COLLISION:
 
835
        logger.error(u"Zeroconf server name collision")
 
836
        service.remove()
 
837
    elif state == avahi.SERVER_RUNNING:
 
838
        service.add()
 
839
 
 
840
 
 
841
def entry_group_state_changed(state, error):
 
842
    """Derived from the Avahi example code"""
 
843
    logger.debug(u"Avahi state change: %i", state)
 
844
    
 
845
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
846
        logger.debug(u"Zeroconf service established.")
 
847
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
848
        logger.warning(u"Zeroconf service name collision.")
 
849
        service.rename()
 
850
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
851
        logger.critical(u"Avahi: Error in group state changed %s",
 
852
                        unicode(error))
 
853
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
854
 
 
855
def if_nametoindex(interface):
 
856
    """Call the C function if_nametoindex(), or equivalent"""
 
857
    global if_nametoindex
 
858
    try:
 
859
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
860
                          (ctypes.util.find_library("c"))
 
861
                          .if_nametoindex)
 
862
    except (OSError, AttributeError):
 
863
        if "struct" not in sys.modules:
 
864
            import struct
 
865
        if "fcntl" not in sys.modules:
 
866
            import fcntl
 
867
        def if_nametoindex(interface):
 
868
            "Get an interface index the hard way, i.e. using fcntl()"
 
869
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
870
            with closing(socket.socket()) as s:
 
871
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
872
                                    struct.pack("16s16x", interface))
 
873
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
874
            return interface_index
 
875
    return if_nametoindex(interface)
 
876
 
 
877
 
 
878
def daemon(nochdir = False, noclose = False):
 
879
    """See daemon(3).  Standard BSD Unix function.
 
880
    This should really exist as os.daemon, but it doesn't (yet)."""
 
881
    if os.fork():
 
882
        sys.exit()
 
883
    os.setsid()
 
884
    if not nochdir:
 
885
        os.chdir("/")
 
886
    if os.fork():
 
887
        sys.exit()
 
888
    if not noclose:
 
889
        # Close all standard open file descriptors
 
890
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
891
        if not stat.S_ISCHR(os.fstat(null).st_mode):
 
892
            raise OSError(errno.ENODEV,
 
893
                          "/dev/null not a character device")
 
894
        os.dup2(null, sys.stdin.fileno())
 
895
        os.dup2(null, sys.stdout.fileno())
 
896
        os.dup2(null, sys.stderr.fileno())
 
897
        if null > 2:
 
898
            os.close(null)
 
899
 
157
900
 
158
901
def main():
159
 
    parser = OptionParser()
 
902
    parser = optparse.OptionParser(version = "%%prog %s" % version)
160
903
    parser.add_option("-i", "--interface", type="string",
161
 
                      default="eth0", metavar="IF",
162
 
                      help="Interface to bind to")
163
 
    parser.add_option("--cert", type="string", default="cert.pem",
164
 
                      metavar="FILE",
165
 
                      help="Public key certificate to use")
166
 
    parser.add_option("--key", type="string", default="key.pem",
167
 
                      metavar="FILE",
168
 
                      help="Private key to use")
169
 
    parser.add_option("--ca", type="string", default="ca.pem",
170
 
                      metavar="FILE",
171
 
                      help="Certificate Authority certificate to use")
172
 
    parser.add_option("--crl", type="string", default="crl.pem",
173
 
                      metavar="FILE",
174
 
                      help="Certificate Revokation List to use")
175
 
    parser.add_option("-p", "--port", type="int", default=49001,
 
904
                      metavar="IF", help="Bind to interface IF")
 
905
    parser.add_option("-a", "--address", type="string",
 
906
                      help="Address to listen for requests on")
 
907
    parser.add_option("-p", "--port", type="int",
176
908
                      help="Port number to receive requests on")
177
 
    parser.add_option("--dh", type="int", metavar="BITS",
178
 
                      help="DH group to use")
179
 
    parser.add_option("-t", "--timeout", type="string", # Parsed later
180
 
                      default="15m",
181
 
                      help="Amount of downtime allowed for clients")
182
 
    parser.add_option("--interval", type="string", # Parsed later
183
 
                      default="5m",
184
 
                      help="How often to check that a client is up")
185
 
    parser.add_option("--check", action="store_true", default=False,
 
909
    parser.add_option("--check", action="store_true",
186
910
                      help="Run self-test")
187
 
    (options, args) = parser.parse_args()
188
 
 
 
911
    parser.add_option("--debug", action="store_true",
 
912
                      help="Debug mode; run in foreground and log to"
 
913
                      " terminal")
 
914
    parser.add_option("--priority", type="string", help="GnuTLS"
 
915
                      " priority string (see GnuTLS documentation)")
 
916
    parser.add_option("--servicename", type="string", metavar="NAME",
 
917
                      help="Zeroconf service name")
 
918
    parser.add_option("--configdir", type="string",
 
919
                      default="/etc/mandos", metavar="DIR",
 
920
                      help="Directory to search for configuration"
 
921
                      " files")
 
922
    parser.add_option("--no-dbus", action="store_false",
 
923
                      dest="use_dbus",
 
924
                      help="Do not provide D-Bus system bus"
 
925
                      " interface")
 
926
    options = parser.parse_args()[0]
 
927
    
189
928
    if options.check:
190
929
        import doctest
191
930
        doctest.testmod()
192
931
        sys.exit()
193
932
    
194
 
    # Parse the time arguments
195
 
    try:
196
 
        options.timeout = string_to_delta(options.timeout)
197
 
    except ValueError:
198
 
        parser.error("option --timeout: Unparseable time")
199
 
    
200
 
    try:
201
 
        options.interval = string_to_delta(options.interval)
202
 
    except ValueError:
203
 
        parser.error("option --interval: Unparseable time")
204
 
    
205
 
    cert = gnutls.crypto.X509Certificate(open(options.cert).read())
206
 
    key = gnutls.crypto.X509PrivateKey(open(options.key).read())
207
 
    ca = gnutls.crypto.X509Certificate(open(options.ca).read())
208
 
    crl = gnutls.crypto.X509CRL(open(options.crl).read())
209
 
    cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
210
 
    
211
 
    # Parse config file
212
 
    defaults = {}
213
 
    client_config_object = ConfigParser.SafeConfigParser(defaults)
214
 
    client_config_object.read("mandos-clients.conf")
215
 
    clients = [Client(name=section,
216
 
                      **(dict(client_config_object.items(section))))
217
 
               for section in client_config_object.sections()]
218
 
    
219
 
    udp_server = IPv6_UDPServer((in6addr_any, options.port),
220
 
                                udp_handler,
221
 
                                options=options)
222
 
    
223
 
    tcp_server = IPv6_TCPServer((in6addr_any, options.port),
224
 
                                tcp_handler,
225
 
                                options=options,
226
 
                                clients=clients,
227
 
                                credentials=cred)
228
 
    
229
 
    while True:
230
 
        in_, out, err = select.select((udp_server,
231
 
                                       tcp_server), (), ())
232
 
        for server in in_:
233
 
            server.handle_request()
234
 
 
235
 
 
236
 
if __name__ == "__main__":
 
933
    # Default values for config file for server-global settings
 
934
    server_defaults = { "interface": "",
 
935
                        "address": "",
 
936
                        "port": "",
 
937
                        "debug": "False",
 
938
                        "priority":
 
939
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
940
                        "servicename": "Mandos",
 
941
                        "use_dbus": "True",
 
942
                        }
 
943
    
 
944
    # Parse config file for server-global settings
 
945
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
946
    del server_defaults
 
947
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
948
    # Convert the SafeConfigParser object to a dict
 
949
    server_settings = server_config.defaults()
 
950
    # Use the appropriate methods on the non-string config options
 
951
    server_settings["debug"] = server_config.getboolean("DEFAULT",
 
952
                                                        "debug")
 
953
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
 
954
                                                           "use_dbus")
 
955
    if server_settings["port"]:
 
956
        server_settings["port"] = server_config.getint("DEFAULT",
 
957
                                                       "port")
 
958
    del server_config
 
959
    
 
960
    # Override the settings from the config file with command line
 
961
    # options, if set.
 
962
    for option in ("interface", "address", "port", "debug",
 
963
                   "priority", "servicename", "configdir",
 
964
                   "use_dbus"):
 
965
        value = getattr(options, option)
 
966
        if value is not None:
 
967
            server_settings[option] = value
 
968
    del options
 
969
    # Now we have our good server settings in "server_settings"
 
970
    
 
971
    # For convenience
 
972
    debug = server_settings["debug"]
 
973
    use_dbus = server_settings["use_dbus"]
 
974
    
 
975
    if not debug:
 
976
        syslogger.setLevel(logging.WARNING)
 
977
        console.setLevel(logging.WARNING)
 
978
    
 
979
    if server_settings["servicename"] != "Mandos":
 
980
        syslogger.setFormatter(logging.Formatter
 
981
                               ('Mandos (%s): %%(levelname)s:'
 
982
                                ' %%(message)s'
 
983
                                % server_settings["servicename"]))
 
984
    
 
985
    # Parse config file with clients
 
986
    client_defaults = { "timeout": "1h",
 
987
                        "interval": "5m",
 
988
                        "checker": "fping -q -- %%(host)s",
 
989
                        "host": "",
 
990
                        }
 
991
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
992
    client_config.read(os.path.join(server_settings["configdir"],
 
993
                                    "clients.conf"))
 
994
    
 
995
    clients = Set()
 
996
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
997
                                 server_settings["port"]),
 
998
                                TCP_handler,
 
999
                                settings=server_settings,
 
1000
                                clients=clients)
 
1001
    pidfilename = "/var/run/mandos.pid"
 
1002
    try:
 
1003
        pidfile = open(pidfilename, "w")
 
1004
    except IOError:
 
1005
        logger.error("Could not open file %r", pidfilename)
 
1006
    
 
1007
    try:
 
1008
        uid = pwd.getpwnam("_mandos").pw_uid
 
1009
        gid = pwd.getpwnam("_mandos").pw_gid
 
1010
    except KeyError:
 
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("nobody").pw_uid
 
1017
                gid = pwd.getpwnam("nogroup").pw_gid
 
1018
            except KeyError:
 
1019
                uid = 65534
 
1020
                gid = 65534
 
1021
    try:
 
1022
        os.setgid(gid)
 
1023
        os.setuid(uid)
 
1024
    except OSError, error:
 
1025
        if error[0] != errno.EPERM:
 
1026
            raise error
 
1027
    
 
1028
    # Enable all possible GnuTLS debugging
 
1029
    if debug:
 
1030
        # "Use a log level over 10 to enable all debugging options."
 
1031
        # - GnuTLS manual
 
1032
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1033
        
 
1034
        @gnutls.library.types.gnutls_log_func
 
1035
        def debug_gnutls(level, string):
 
1036
            logger.debug("GnuTLS: %s", string[:-1])
 
1037
        
 
1038
        (gnutls.library.functions
 
1039
         .gnutls_global_set_log_function(debug_gnutls))
 
1040
    
 
1041
    global service
 
1042
    service = AvahiService(name = server_settings["servicename"],
 
1043
                           servicetype = "_mandos._tcp", )
 
1044
    if server_settings["interface"]:
 
1045
        service.interface = (if_nametoindex
 
1046
                             (server_settings["interface"]))
 
1047
    
 
1048
    global main_loop
 
1049
    global bus
 
1050
    global server
 
1051
    # From the Avahi example code
 
1052
    DBusGMainLoop(set_as_default=True )
 
1053
    main_loop = gobject.MainLoop()
 
1054
    bus = dbus.SystemBus()
 
1055
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
1056
                                           avahi.DBUS_PATH_SERVER),
 
1057
                            avahi.DBUS_INTERFACE_SERVER)
 
1058
    # End of Avahi example code
 
1059
    if use_dbus:
 
1060
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1061
    
 
1062
    clients.update(Set(Client(name = section,
 
1063
                              config
 
1064
                              = dict(client_config.items(section)),
 
1065
                              use_dbus = use_dbus)
 
1066
                       for section in client_config.sections()))
 
1067
    if not clients:
 
1068
        logger.warning(u"No clients defined")
 
1069
    
 
1070
    if debug:
 
1071
        # Redirect stdin so all checkers get /dev/null
 
1072
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1073
        os.dup2(null, sys.stdin.fileno())
 
1074
        if null > 2:
 
1075
            os.close(null)
 
1076
    else:
 
1077
        # No console logging
 
1078
        logger.removeHandler(console)
 
1079
        # Close all input and output, do double fork, etc.
 
1080
        daemon()
 
1081
    
 
1082
    try:
 
1083
        pid = os.getpid()
 
1084
        pidfile.write(str(pid) + "\n")
 
1085
        pidfile.close()
 
1086
        del pidfile
 
1087
    except IOError:
 
1088
        logger.error(u"Could not write to file %r with PID %d",
 
1089
                     pidfilename, pid)
 
1090
    except NameError:
 
1091
        # "pidfile" was never created
 
1092
        pass
 
1093
    del pidfilename
 
1094
    
 
1095
    def cleanup():
 
1096
        "Cleanup function; run on exit"
 
1097
        global group
 
1098
        # From the Avahi example code
 
1099
        if not group is None:
 
1100
            group.Free()
 
1101
            group = None
 
1102
        # End of Avahi example code
 
1103
        
 
1104
        while clients:
 
1105
            client = clients.pop()
 
1106
            client.disable_hook = None
 
1107
            client.disable()
 
1108
    
 
1109
    atexit.register(cleanup)
 
1110
    
 
1111
    if not debug:
 
1112
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1113
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1114
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1115
    
 
1116
    if use_dbus:
 
1117
        class MandosServer(dbus.service.Object):
 
1118
            """A D-Bus proxy object"""
 
1119
            def __init__(self):
 
1120
                dbus.service.Object.__init__(self, bus, "/")
 
1121
            _interface = u"se.bsnet.fukt.Mandos"
 
1122
            
 
1123
            @dbus.service.signal(_interface, signature="oa{sv}")
 
1124
            def ClientAdded(self, objpath, properties):
 
1125
                "D-Bus signal"
 
1126
                pass
 
1127
            
 
1128
            @dbus.service.signal(_interface, signature="os")
 
1129
            def ClientRemoved(self, objpath, name):
 
1130
                "D-Bus signal"
 
1131
                pass
 
1132
            
 
1133
            @dbus.service.method(_interface, out_signature="ao")
 
1134
            def GetAllClients(self):
 
1135
                "D-Bus method"
 
1136
                return dbus.Array(c.dbus_object_path for c in clients)
 
1137
            
 
1138
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
 
1139
            def GetAllClientsWithProperties(self):
 
1140
                "D-Bus method"
 
1141
                return dbus.Dictionary(
 
1142
                    ((c.dbus_object_path, c.GetAllProperties())
 
1143
                     for c in clients),
 
1144
                    signature="oa{sv}")
 
1145
            
 
1146
            @dbus.service.method(_interface, in_signature="o")
 
1147
            def RemoveClient(self, object_path):
 
1148
                "D-Bus method"
 
1149
                for c in clients:
 
1150
                    if c.dbus_object_path == object_path:
 
1151
                        clients.remove(c)
 
1152
                        # Don't signal anything except ClientRemoved
 
1153
                        c.use_dbus = False
 
1154
                        c.disable()
 
1155
                        # Emit D-Bus signal
 
1156
                        self.ClientRemoved(object_path, c.name)
 
1157
                        return
 
1158
                raise KeyError
 
1159
            
 
1160
            del _interface
 
1161
        
 
1162
        mandos_server = MandosServer()
 
1163
    
 
1164
    for client in clients:
 
1165
        if use_dbus:
 
1166
            # Emit D-Bus signal
 
1167
            mandos_server.ClientAdded(client.dbus_object_path,
 
1168
                                      client.GetAllProperties())
 
1169
        client.enable()
 
1170
    
 
1171
    tcp_server.enable()
 
1172
    tcp_server.server_activate()
 
1173
    
 
1174
    # Find out what port we got
 
1175
    service.port = tcp_server.socket.getsockname()[1]
 
1176
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
1177
                u" scope_id %d" % tcp_server.socket.getsockname())
 
1178
    
 
1179
    #service.interface = tcp_server.socket.getsockname()[3]
 
1180
    
 
1181
    try:
 
1182
        # From the Avahi example code
 
1183
        server.connect_to_signal("StateChanged", server_state_changed)
 
1184
        try:
 
1185
            server_state_changed(server.GetState())
 
1186
        except dbus.exceptions.DBusException, error:
 
1187
            logger.critical(u"DBusException: %s", error)
 
1188
            sys.exit(1)
 
1189
        # End of Avahi example code
 
1190
        
 
1191
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
1192
                             lambda *args, **kwargs:
 
1193
                             (tcp_server.handle_request
 
1194
                              (*args[2:], **kwargs) or True))
 
1195
        
 
1196
        logger.debug(u"Starting main loop")
 
1197
        main_loop.run()
 
1198
    except AvahiError, error:
 
1199
        logger.critical(u"AvahiError: %s", error)
 
1200
        sys.exit(1)
 
1201
    except KeyboardInterrupt:
 
1202
        if debug:
 
1203
            print >> sys.stderr
 
1204
        logger.debug("Server received KeyboardInterrupt")
 
1205
    logger.debug("Server exiting")
 
1206
 
 
1207
if __name__ == '__main__':
237
1208
    main()
238