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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 Teddy Hogeborn
 
15
# Copyright © 2008 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
# 
2
33
 
3
 
from __future__ import division
 
34
from __future__ import division, with_statement, absolute_import
4
35
 
5
36
import SocketServer
6
37
import socket
7
 
import select
8
38
from optparse import OptionParser
9
39
import datetime
10
40
import errno
11
41
import gnutls.crypto
12
42
import gnutls.connection
13
43
import gnutls.errors
 
44
import gnutls.library.functions
 
45
import gnutls.library.constants
 
46
import gnutls.library.types
14
47
import ConfigParser
15
48
import sys
16
49
import re
18
51
import signal
19
52
from sets import Set
20
53
import subprocess
21
 
 
22
 
class Client(object):
23
 
    def __init__(self, name=None, options=None, dn=None,
24
 
                 password=None, passfile=None, fqdn=None,
25
 
                 timeout=None, interval=-1):
26
 
        self.name = name
27
 
        self.dn = dn
28
 
        if password:
29
 
            self.password = password
30
 
        elif passfile:
31
 
            self.password = open(passfile).readall()
32
 
        else:
33
 
            print "No Password or Passfile in client config file"
34
 
            # raise RuntimeError XXX
35
 
            self.password = "gazonk"
36
 
        self.fqdn = fqdn                # string
37
 
        self.created = datetime.datetime.now()
38
 
        self.last_seen = None           # datetime.datetime()
39
 
        if timeout is None:
40
 
            timeout = options.timeout
41
 
        self.timeout = timeout          # datetime.timedelta()
42
 
        if interval == -1:
43
 
            interval = options.interval
44
 
        else:
45
 
            interval = string_to_delta(interval)
46
 
        self.interval = interval        # datetime.timedelta()
47
 
        self.next_check = datetime.datetime.now() # datetime.datetime()
48
 
        # Note: next_check may be in the past if checker is not None
49
 
        self.checker = None             # or a subprocess.Popen()
50
 
    def check_action(self):
51
 
        """The checker said something and might have completed.
52
 
        Check if is has, and take appropriate actions."""
53
 
        if self.checker.poll() is None:
54
 
            # False alarm, no result yet
55
 
            #self.checker.read()
56
 
            #print "Checker for %(name)s said nothing?" % vars(self)
57
 
            return
58
 
        now = datetime.datetime.now()
59
 
        if self.checker.returncode == 0:
60
 
            print "Checker for %(name)s succeeded" % vars(self)
61
 
            self.last_seen = now
62
 
        else:
63
 
            print "Checker for %(name)s failed" % vars(self)
64
 
        while self.next_check <= now:
65
 
            self.next_check += self.interval
66
 
        self.checker = None
67
 
    handle_request = check_action
 
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 = "1.0.2"
 
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):
 
86
        self.value = value
 
87
        super(AvahiError, self).__init__()
 
88
    def __str__(self):
 
89
        return 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("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
class Client(dbus.service.Object):
 
174
    """A representation of a client host served by this server.
 
175
    Attributes:
 
176
    name:      string; from the config file, used in log messages
 
177
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
178
                 uniquely identify the client
 
179
    secret:    bytestring; sent verbatim (over TLS) to client
 
180
    host:      string; available for use by the checker command
 
181
    created:   datetime.datetime(); (UTC) object creation
 
182
    started:   datetime.datetime(); (UTC) last started
 
183
    last_checked_ok: datetime.datetime(); (UTC) or None
 
184
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
185
                                     until this client is invalid
 
186
    interval:  datetime.timedelta(); How often to start a new checker
 
187
    stop_hook: If set, called by stop() as stop_hook(self)
 
188
    checker:   subprocess.Popen(); a running checker process used
 
189
                                   to see if the client lives.
 
190
                                   'None' if no process is running.
 
191
    checker_initiator_tag: a gobject event source tag, or None
 
192
    stop_initiator_tag:    - '' -
 
193
    checker_callback_tag:  - '' -
 
194
    checker_command: string; External command which is run to check if
 
195
                     client lives.  %() expansions are done at
 
196
                     runtime with vars(self) as dict, so that for
 
197
                     instance %(name)s can be used in the command.
 
198
    Private attibutes:
 
199
    _timeout: Real variable for 'timeout'
 
200
    _interval: Real variable for 'interval'
 
201
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
202
    _interval_milliseconds: - '' -
 
203
    """
 
204
    def _set_timeout(self, timeout):
 
205
        "Setter function for the 'timeout' attribute"
 
206
        self._timeout = timeout
 
207
        self._timeout_milliseconds = ((self.timeout.days
 
208
                                       * 24 * 60 * 60 * 1000)
 
209
                                      + (self.timeout.seconds * 1000)
 
210
                                      + (self.timeout.microseconds
 
211
                                         // 1000))
 
212
        # Emit D-Bus signal
 
213
        self.TimeoutChanged(self._timeout_milliseconds)
 
214
    timeout = property(lambda self: self._timeout, _set_timeout)
 
215
    del _set_timeout
 
216
    
 
217
    def _set_interval(self, interval):
 
218
        "Setter function for the 'interval' attribute"
 
219
        self._interval = interval
 
220
        self._interval_milliseconds = ((self.interval.days
 
221
                                        * 24 * 60 * 60 * 1000)
 
222
                                       + (self.interval.seconds
 
223
                                          * 1000)
 
224
                                       + (self.interval.microseconds
 
225
                                          // 1000))
 
226
        # Emit D-Bus signal
 
227
        self.IntervalChanged(self._interval_milliseconds)
 
228
    interval = property(lambda self: self._interval, _set_interval)
 
229
    del _set_interval
 
230
    
 
231
    def __init__(self, name = None, stop_hook=None, config=None):
 
232
        """Note: the 'checker' key in 'config' sets the
 
233
        'checker_command' attribute and *not* the 'checker'
 
234
        attribute."""
 
235
        dbus.service.Object.__init__(self, bus,
 
236
                                     "/Mandos/clients/%s"
 
237
                                     % name.replace(".", "_"))
 
238
        if config is None:
 
239
            config = {}
 
240
        self.name = name
 
241
        logger.debug(u"Creating client %r", self.name)
 
242
        # Uppercase and remove spaces from fingerprint for later
 
243
        # comparison purposes with return value from the fingerprint()
 
244
        # function
 
245
        self.fingerprint = (config["fingerprint"].upper()
 
246
                            .replace(u" ", u""))
 
247
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
 
248
        if "secret" in config:
 
249
            self.secret = config["secret"].decode(u"base64")
 
250
        elif "secfile" in config:
 
251
            with closing(open(os.path.expanduser
 
252
                              (os.path.expandvars
 
253
                               (config["secfile"])))) as secfile:
 
254
                self.secret = secfile.read()
 
255
        else:
 
256
            raise TypeError(u"No secret or secfile for client %s"
 
257
                            % self.name)
 
258
        self.host = config.get("host", "")
 
259
        self.created = datetime.datetime.utcnow()
 
260
        self.started = None
 
261
        self.last_checked_ok = None
 
262
        self.timeout = string_to_delta(config["timeout"])
 
263
        self.interval = string_to_delta(config["interval"])
 
264
        self.stop_hook = stop_hook
 
265
        self.checker = None
 
266
        self.checker_initiator_tag = None
 
267
        self.stop_initiator_tag = None
 
268
        self.checker_callback_tag = None
 
269
        self.check_command = config["checker"]
 
270
    
 
271
    def start(self):
 
272
        """Start this client's checker and timeout hooks"""
 
273
        self.started = 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 stop() when 'timeout' has passed
 
282
        self.stop_initiator_tag = (gobject.timeout_add
 
283
                                   (self._timeout_milliseconds,
 
284
                                    self.stop))
 
285
        # Emit D-Bus signal
 
286
        self.StateChanged(True)
 
287
    
 
288
    def stop(self):
 
289
        """Stop this client."""
 
290
        if getattr(self, "started", None) is not None:
 
291
            logger.info(u"Stopping client %s", self.name)
 
292
        else:
 
293
            return False
 
294
        if getattr(self, "stop_initiator_tag", False):
 
295
            gobject.source_remove(self.stop_initiator_tag)
 
296
            self.stop_initiator_tag = None
 
297
        if getattr(self, "checker_initiator_tag", False):
 
298
            gobject.source_remove(self.checker_initiator_tag)
 
299
            self.checker_initiator_tag = None
 
300
        self.stop_checker()
 
301
        if self.stop_hook:
 
302
            self.stop_hook(self)
 
303
        self.started = None
 
304
        # Emit D-Bus signal
 
305
        self.StateChanged(False)
 
306
        # Do not run this again if called by a gobject.timeout_add
 
307
        return False
 
308
    
 
309
    def __del__(self):
 
310
        self.stop_hook = None
 
311
        self.stop()
 
312
    
 
313
    def checker_callback(self, pid, condition):
 
314
        """The checker has completed, so take appropriate actions."""
 
315
        self.checker_callback_tag = None
 
316
        self.checker = None
 
317
        if (os.WIFEXITED(condition) 
 
318
            and (os.WEXITSTATUS(condition) == 0)):
 
319
            logger.info(u"Checker for %(name)s succeeded",
 
320
                        vars(self))
 
321
            # Emit D-Bus signal
 
322
            self.CheckerCompleted(True)
 
323
            self.bump_timeout()
 
324
        elif not os.WIFEXITED(condition):
 
325
            logger.warning(u"Checker for %(name)s crashed?",
 
326
                           vars(self))
 
327
            # Emit D-Bus signal
 
328
            self.CheckerCompleted(False)
 
329
        else:
 
330
            logger.info(u"Checker for %(name)s failed",
 
331
                        vars(self))
 
332
            # Emit D-Bus signal
 
333
            self.CheckerCompleted(False)
 
334
    
 
335
    def bump_timeout(self):
 
336
        """Bump up the timeout for this client.
 
337
        This should only be called when the client has been seen,
 
338
        alive and well.
 
339
        """
 
340
        self.last_checked_ok = datetime.datetime.utcnow()
 
341
        gobject.source_remove(self.stop_initiator_tag)
 
342
        self.stop_initiator_tag = (gobject.timeout_add
 
343
                                   (self._timeout_milliseconds,
 
344
                                    self.stop))
 
345
    
68
346
    def start_checker(self):
69
 
        self.stop_checker()
70
 
        try:
71
 
            self.checker = subprocess.Popen("sleep 10; fping -q -- %s"
72
 
                                            % re.escape(self.fqdn),
73
 
                                            stdout=subprocess.PIPE,
74
 
                                            close_fds=True,
75
 
                                            shell=True, cwd="/")
76
 
        except subprocess.OSError, e:
77
 
            print "Failed to start subprocess:", e
 
347
        """Start a new checker subprocess if one is not running.
 
348
        If a checker already exists, leave it running and do
 
349
        nothing."""
 
350
        # The reason for not killing a running checker is that if we
 
351
        # did that, then if a checker (for some reason) started
 
352
        # running slowly and taking more than 'interval' time, the
 
353
        # client would inevitably timeout, since no checker would get
 
354
        # a chance to run to completion.  If we instead leave running
 
355
        # checkers alone, the checker would have to take more time
 
356
        # than 'timeout' for the client to be declared invalid, which
 
357
        # is as it should be.
 
358
        if self.checker is None:
 
359
            try:
 
360
                # In case check_command has exactly one % operator
 
361
                command = self.check_command % self.host
 
362
            except TypeError:
 
363
                # Escape attributes for the shell
 
364
                escaped_attrs = dict((key, re.escape(str(val)))
 
365
                                     for key, val in
 
366
                                     vars(self).iteritems())
 
367
                try:
 
368
                    command = self.check_command % escaped_attrs
 
369
                except TypeError, error:
 
370
                    logger.error(u'Could not format string "%s":'
 
371
                                 u' %s', self.check_command, error)
 
372
                    return True # Try again later
 
373
            try:
 
374
                logger.info(u"Starting checker %r for %s",
 
375
                            command, self.name)
 
376
                # We don't need to redirect stdout and stderr, since
 
377
                # in normal mode, that is already done by daemon(),
 
378
                # and in debug mode we don't want to.  (Stdin is
 
379
                # always replaced by /dev/null.)
 
380
                self.checker = subprocess.Popen(command,
 
381
                                                close_fds=True,
 
382
                                                shell=True, cwd="/")
 
383
                self.checker_callback_tag = (gobject.child_watch_add
 
384
                                             (self.checker.pid,
 
385
                                              self.checker_callback))
 
386
                # Emit D-Bus signal
 
387
                self.CheckerStarted(command)
 
388
            except OSError, error:
 
389
                logger.error(u"Failed to start subprocess: %s",
 
390
                             error)
 
391
        # Re-run this periodically if run by gobject.timeout_add
 
392
        return True
 
393
    
78
394
    def stop_checker(self):
79
 
        if self.checker is None:
 
395
        """Force the checker process, if any, to stop."""
 
396
        if self.checker_callback_tag:
 
397
            gobject.source_remove(self.checker_callback_tag)
 
398
            self.checker_callback_tag = None
 
399
        if getattr(self, "checker", None) is None:
80
400
            return
81
 
        os.kill(self.checker.pid, signal.SIGTERM)
82
 
        if self.checker.poll() is None:
83
 
            os.kill(self.checker.pid, signal.SIGKILL)
 
401
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
402
        try:
 
403
            os.kill(self.checker.pid, signal.SIGTERM)
 
404
            #os.sleep(0.5)
 
405
            #if self.checker.poll() is None:
 
406
            #    os.kill(self.checker.pid, signal.SIGKILL)
 
407
        except OSError, error:
 
408
            if error.errno != errno.ESRCH: # No such process
 
409
                raise
84
410
        self.checker = None
85
 
    __del__ = stop_checker
86
 
    def fileno(self):
87
 
        if self.checker is None:
88
 
            return None
89
 
        return self.checker.stdout.fileno()
90
 
    def next_stop(self):
91
 
        """The time when something must be done about this client
92
 
        May be in the past."""
93
 
        if self.last_seen is None:
94
 
            # This client has never been seen
95
 
            next_timeout = self.created + self.timeout
96
 
        else:
97
 
            next_timeout = self.last_seen + self.timeout
98
 
        if self.checker is None:
99
 
            return min(next_timeout, self.next_check)
100
 
        else:
101
 
            return next_timeout
102
 
    def still_valid(self, now=None):
103
 
        """Has this client's timeout not passed?"""
104
 
        if now is None:
105
 
            now = datetime.datetime.now()
106
 
        if self.last_seen is None:
 
411
    
 
412
    def still_valid(self):
 
413
        """Has the timeout not yet passed for this client?"""
 
414
        if not self.started:
 
415
            return False
 
416
        now = datetime.datetime.utcnow()
 
417
        if self.last_checked_ok is None:
107
418
            return now < (self.created + self.timeout)
108
419
        else:
109
 
            return now < (self.last_seen + self.timeout)
110
 
    def it_is_time_to_check(self, now=None):
111
 
        if now is None:
112
 
            now = datetime.datetime.now()
113
 
        return self.next_check <= now
114
 
 
115
 
 
116
 
class server_metaclass(type):
117
 
    "Common behavior for the UDP and TCP server classes"
118
 
    def __new__(cls, name, bases, attrs):
119
 
        attrs["address_family"] = socket.AF_INET6
120
 
        attrs["allow_reuse_address"] = True
121
 
        def server_bind(self):
122
 
            if self.options.interface:
123
 
                if not hasattr(socket, "SO_BINDTODEVICE"):
124
 
                    # From /usr/include/asm-i486/socket.h
125
 
                    socket.SO_BINDTODEVICE = 25
126
 
                try:
127
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
128
 
                                           socket.SO_BINDTODEVICE,
129
 
                                           self.options.interface)
130
 
                except socket.error, error:
131
 
                    if error[0] == errno.EPERM:
132
 
                        print "Warning: No permission to bind to interface", \
133
 
                              self.options.interface
134
 
                    else:
135
 
                        raise error
136
 
            return super(type(self), self).server_bind()
137
 
        attrs["server_bind"] = server_bind
138
 
        def init(self, *args, **kwargs):
139
 
            if "options" in kwargs:
140
 
                self.options = kwargs["options"]
141
 
                del kwargs["options"]
142
 
            if "clients" in kwargs:
143
 
                self.clients = kwargs["clients"]
144
 
                del kwargs["clients"]
145
 
            if "credentials" in kwargs:
146
 
                self.credentials = kwargs["credentials"]
147
 
                del kwargs["credentials"]
148
 
            return super(type(self), self).__init__(*args, **kwargs)
149
 
        attrs["__init__"] = init
150
 
        return type.__new__(cls, name, bases, attrs)
151
 
 
152
 
 
153
 
class udp_handler(SocketServer.DatagramRequestHandler, object):
154
 
    def handle(self):
155
 
        self.wfile.write("Polo")
156
 
        print "UDP request answered"
157
 
 
158
 
 
159
 
class IPv6_UDPServer(SocketServer.UDPServer, object):
160
 
    __metaclass__ = server_metaclass
161
 
    def verify_request(self, request, client_address):
162
 
        print "UDP request came"
163
 
        return request[0] == "Marco"
164
 
 
165
 
 
166
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
167
 
    def handle(self):
168
 
        print "TCP request came"
169
 
        print "Request:", self.request
170
 
        print "Client Address:", self.client_address
171
 
        print "Server:", self.server
172
 
        session = gnutls.connection.ServerSession(self.request,
173
 
                                                  self.server.credentials)
174
 
        session.handshake()
175
 
        if session.peer_certificate:
176
 
            print "DN:", session.peer_certificate.subject
177
 
        try:
178
 
            session.verify_peer()
179
 
        except gnutls.errors.CertificateError, error:
180
 
            print "Verify failed", error
181
 
            session.bye()
182
 
            return
183
 
        try:
184
 
            session.send([client.password
185
 
                          for client in self.server.clients
186
 
                          if (client.dn ==
187
 
                              session.peer_certificate.subject)][0])
188
 
        except IndexError:
189
 
            session.send("gazonk")
190
 
            # Log maybe? XXX
 
420
            return now < (self.last_checked_ok + self.timeout)
 
421
    
 
422
    ## D-Bus methods & signals
 
423
    _interface = u"org.mandos_system.Mandos.Client"
 
424
    
 
425
    def _datetime_to_dbus_struct(dt):
 
426
        return dbus.Struct(dt.year, dt.month, dt.day, dt.hour,
 
427
                           dt.minute, dt.second, dt.microsecond,
 
428
                           signature="nyyyyyu")
 
429
    
 
430
    # BumpTimeout - method
 
431
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
 
432
    BumpTimeout.__name__ = "BumpTimeout"
 
433
    
 
434
    # IntervalChanged - signal
 
435
    @dbus.service.signal(_interface, signature="t")
 
436
    def IntervalChanged(self, t):
 
437
        "D-Bus signal"
 
438
        pass
 
439
    
 
440
    # CheckerCompleted - signal
 
441
    @dbus.service.signal(_interface, signature="b")
 
442
    def CheckerCompleted(self, success):
 
443
        "D-Bus signal"
 
444
        pass
 
445
    
 
446
    # CheckerIsRunning - method
 
447
    @dbus.service.method(_interface, out_signature="b")
 
448
    def CheckerIsRunning(self):
 
449
        "D-Bus getter method"
 
450
        return self.checker is not None
 
451
    
 
452
    # CheckerStarted - signal
 
453
    @dbus.service.signal(_interface, signature="s")
 
454
    def CheckerStarted(self, command):
 
455
        "D-Bus signal"
 
456
        pass
 
457
    
 
458
    # GetChecker - method
 
459
    @dbus.service.method(_interface, out_signature="s")
 
460
    def GetChecker(self):
 
461
        "D-Bus getter method"
 
462
        return self.checker_command
 
463
    
 
464
    # GetCreated - method
 
465
    @dbus.service.method(_interface, out_signature="(nyyyyyu)")
 
466
    def GetCreated(self):
 
467
        "D-Bus getter method"
 
468
        return datetime_to_dbus_struct(self.created)
 
469
    
 
470
    # GetFingerprint - method
 
471
    @dbus.service.method(_interface, out_signature="s")
 
472
    def GetFingerprint(self):
 
473
        "D-Bus getter method"
 
474
        return self.fingerprint
 
475
    
 
476
    # GetHost - method
 
477
    @dbus.service.method(_interface, out_signature="s")
 
478
    def GetHost(self):
 
479
        "D-Bus getter method"
 
480
        return self.host
 
481
    
 
482
    # GetInterval - method
 
483
    @dbus.service.method(_interface, out_signature="t")
 
484
    def GetInterval(self):
 
485
        "D-Bus getter method"
 
486
        return self._interval_milliseconds
 
487
    
 
488
    # GetName - method
 
489
    @dbus.service.method(_interface, out_signature="s")
 
490
    def GetName(self):
 
491
        "D-Bus getter method"
 
492
        return self.name
 
493
    
 
494
    # GetStarted - method
 
495
    @dbus.service.method(_interface, out_signature="(nyyyyyu)")
 
496
    def GetStarted(self):
 
497
        "D-Bus getter method"
 
498
        if self.started is not None:
 
499
            return datetime_to_dbus_struct(self.started)
 
500
        else:
 
501
            return dbus.Struct(0, 0, 0, 0, 0, 0, 0,
 
502
                               signature="nyyyyyu")
 
503
    
 
504
    # GetTimeout - method
 
505
    @dbus.service.method(_interface, out_signature="t")
 
506
    def GetTimeout(self):
 
507
        "D-Bus getter method"
 
508
        return self._timeout_milliseconds
 
509
    
 
510
    # SetChecker - method
 
511
    @dbus.service.method(_interface, in_signature="s")
 
512
    def SetChecker(self, checker):
 
513
        "D-Bus setter method"
 
514
        self.checker_command = checker
 
515
    
 
516
    # SetHost - method
 
517
    @dbus.service.method(_interface, in_signature="s")
 
518
    def SetHost(self, host):
 
519
        "D-Bus setter method"
 
520
        self.host = host
 
521
    
 
522
    # SetInterval - method
 
523
    @dbus.service.method(_interface, in_signature="t")
 
524
    def SetInterval(self, milliseconds):
 
525
        self.interval = datetime.timdeelta(0, 0, 0, milliseconds)
 
526
    
 
527
    # SetTimeout - method
 
528
    @dbus.service.method(_interface, in_signature="t")
 
529
    def SetTimeout(self, milliseconds):
 
530
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
531
    
 
532
    # SetSecret - method
 
533
    @dbus.service.method(_interface, in_signature="ay",
 
534
                         byte_arrays=True)
 
535
    def SetSecret(self, secret):
 
536
        "D-Bus setter method"
 
537
        self.secret = str(secret)
 
538
    
 
539
    # Start - method
 
540
    Start = dbus.service.method(_interface)(start)
 
541
    Start.__name__ = "Start"
 
542
    
 
543
    # StartChecker - method
 
544
    StartChecker = dbus.service.method(_interface)(start_checker)
 
545
    StartChecker.__name__ = "StartChecker"
 
546
    
 
547
    # StateChanged - signal
 
548
    @dbus.service.signal(_interface, signature="b")
 
549
    def StateChanged(self, started):
 
550
        "D-Bus signal"
 
551
        pass
 
552
    
 
553
    # StillValid - method
 
554
    StillValid = (dbus.service.method(_interface, out_signature="b")
 
555
                  (still_valid))
 
556
    StillValid.__name__ = "StillValid"
 
557
    
 
558
    # Stop - method
 
559
    Stop = dbus.service.method(_interface)(stop)
 
560
    Stop.__name__ = "Stop"
 
561
    
 
562
    # StopChecker - method
 
563
    StopChecker = dbus.service.method(_interface)(stop_checker)
 
564
    StopChecker.__name__ = "StopChecker"
 
565
    
 
566
    # TimeoutChanged - signal
 
567
    @dbus.service.signal(_interface, signature="t")
 
568
    def TimeoutChanged(self, t):
 
569
        "D-Bus signal"
 
570
        pass
 
571
    
 
572
    del _datetime_to_dbus_struct
 
573
    del _interface
 
574
 
 
575
 
 
576
def peer_certificate(session):
 
577
    "Return the peer's OpenPGP certificate as a bytestring"
 
578
    # If not an OpenPGP certificate...
 
579
    if (gnutls.library.functions
 
580
        .gnutls_certificate_type_get(session._c_object)
 
581
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
582
        # ...do the normal thing
 
583
        return session.peer_certificate
 
584
    list_size = ctypes.c_uint()
 
585
    cert_list = (gnutls.library.functions
 
586
                 .gnutls_certificate_get_peers
 
587
                 (session._c_object, ctypes.byref(list_size)))
 
588
    if list_size.value == 0:
 
589
        return None
 
590
    cert = cert_list[0]
 
591
    return ctypes.string_at(cert.data, cert.size)
 
592
 
 
593
 
 
594
def fingerprint(openpgp):
 
595
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
596
    # New GnuTLS "datum" with the OpenPGP public key
 
597
    datum = (gnutls.library.types
 
598
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
599
                                         ctypes.POINTER
 
600
                                         (ctypes.c_ubyte)),
 
601
                             ctypes.c_uint(len(openpgp))))
 
602
    # New empty GnuTLS certificate
 
603
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
604
    (gnutls.library.functions
 
605
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
606
    # Import the OpenPGP public key into the certificate
 
607
    (gnutls.library.functions
 
608
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
609
                                gnutls.library.constants
 
610
                                .GNUTLS_OPENPGP_FMT_RAW))
 
611
    # Verify the self signature in the key
 
612
    crtverify = ctypes.c_uint()
 
613
    (gnutls.library.functions
 
614
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
615
    if crtverify.value != 0:
 
616
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
617
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
618
    # New buffer for the fingerprint
 
619
    buf = ctypes.create_string_buffer(20)
 
620
    buf_len = ctypes.c_size_t()
 
621
    # Get the fingerprint from the certificate into the buffer
 
622
    (gnutls.library.functions
 
623
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
624
                                         ctypes.byref(buf_len)))
 
625
    # Deinit the certificate
 
626
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
627
    # Convert the buffer to a Python bytestring
 
628
    fpr = ctypes.string_at(buf, buf_len.value)
 
629
    # Convert the bytestring to hexadecimal notation
 
630
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
631
    return hex_fpr
 
632
 
 
633
 
 
634
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
635
    """A TCP request handler class.
 
636
    Instantiated by IPv6_TCPServer for each request to handle it.
 
637
    Note: This will run in its own forked process."""
 
638
    
 
639
    def handle(self):
 
640
        logger.info(u"TCP connection from: %s",
 
641
                    unicode(self.client_address))
 
642
        session = (gnutls.connection
 
643
                   .ClientSession(self.request,
 
644
                                  gnutls.connection
 
645
                                  .X509Credentials()))
 
646
        
 
647
        line = self.request.makefile().readline()
 
648
        logger.debug(u"Protocol version: %r", line)
 
649
        try:
 
650
            if int(line.strip().split()[0]) > 1:
 
651
                raise RuntimeError
 
652
        except (ValueError, IndexError, RuntimeError), error:
 
653
            logger.error(u"Unknown protocol version: %s", error)
 
654
            return
 
655
        
 
656
        # Note: gnutls.connection.X509Credentials is really a generic
 
657
        # GnuTLS certificate credentials object so long as no X.509
 
658
        # keys are added to it.  Therefore, we can use it here despite
 
659
        # using OpenPGP certificates.
 
660
        
 
661
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
662
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
663
        #                "+DHE-DSS"))
 
664
        # Use a fallback default, since this MUST be set.
 
665
        priority = self.server.settings.get("priority", "NORMAL")
 
666
        (gnutls.library.functions
 
667
         .gnutls_priority_set_direct(session._c_object,
 
668
                                     priority, None))
 
669
        
 
670
        try:
 
671
            session.handshake()
 
672
        except gnutls.errors.GNUTLSError, error:
 
673
            logger.warning(u"Handshake failed: %s", error)
 
674
            # Do not run session.bye() here: the session is not
 
675
            # established.  Just abandon the request.
 
676
            return
 
677
        try:
 
678
            fpr = fingerprint(peer_certificate(session))
 
679
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
680
            logger.warning(u"Bad certificate: %s", error)
 
681
            session.bye()
 
682
            return
 
683
        logger.debug(u"Fingerprint: %s", fpr)
 
684
        for c in self.server.clients:
 
685
            if c.fingerprint == fpr:
 
686
                client = c
 
687
                break
 
688
        else:
 
689
            logger.warning(u"Client not found for fingerprint: %s",
 
690
                           fpr)
 
691
            session.bye()
 
692
            return
 
693
        # Have to check if client.still_valid(), since it is possible
 
694
        # that the client timed out while establishing the GnuTLS
 
695
        # session.
 
696
        if not client.still_valid():
 
697
            logger.warning(u"Client %(name)s is invalid",
 
698
                           vars(client))
 
699
            session.bye()
 
700
            return
 
701
        ## This won't work here, since we're in a fork.
 
702
        # client.bump_timeout()
 
703
        sent_size = 0
 
704
        while sent_size < len(client.secret):
 
705
            sent = session.send(client.secret[sent_size:])
 
706
            logger.debug(u"Sent: %d, remaining: %d",
 
707
                         sent, len(client.secret)
 
708
                         - (sent_size + sent))
 
709
            sent_size += sent
191
710
        session.bye()
192
711
 
193
712
 
194
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
195
 
    __metaclass__ = server_metaclass
 
713
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
714
                     SocketServer.TCPServer, object):
 
715
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
716
    Attributes:
 
717
        settings:       Server settings
 
718
        clients:        Set() of Client objects
 
719
        enabled:        Boolean; whether this server is activated yet
 
720
    """
 
721
    address_family = socket.AF_INET6
 
722
    def __init__(self, *args, **kwargs):
 
723
        if "settings" in kwargs:
 
724
            self.settings = kwargs["settings"]
 
725
            del kwargs["settings"]
 
726
        if "clients" in kwargs:
 
727
            self.clients = kwargs["clients"]
 
728
            del kwargs["clients"]
 
729
        self.enabled = False
 
730
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
731
    def server_bind(self):
 
732
        """This overrides the normal server_bind() function
 
733
        to bind to an interface if one was specified, and also NOT to
 
734
        bind to an address or port if they were not specified."""
 
735
        if self.settings["interface"]:
 
736
            # 25 is from /usr/include/asm-i486/socket.h
 
737
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
738
            try:
 
739
                self.socket.setsockopt(socket.SOL_SOCKET,
 
740
                                       SO_BINDTODEVICE,
 
741
                                       self.settings["interface"])
 
742
            except socket.error, error:
 
743
                if error[0] == errno.EPERM:
 
744
                    logger.error(u"No permission to"
 
745
                                 u" bind to interface %s",
 
746
                                 self.settings["interface"])
 
747
                else:
 
748
                    raise error
 
749
        # Only bind(2) the socket if we really need to.
 
750
        if self.server_address[0] or self.server_address[1]:
 
751
            if not self.server_address[0]:
 
752
                in6addr_any = "::"
 
753
                self.server_address = (in6addr_any,
 
754
                                       self.server_address[1])
 
755
            elif not self.server_address[1]:
 
756
                self.server_address = (self.server_address[0],
 
757
                                       0)
 
758
#                 if self.settings["interface"]:
 
759
#                     self.server_address = (self.server_address[0],
 
760
#                                            0, # port
 
761
#                                            0, # flowinfo
 
762
#                                            if_nametoindex
 
763
#                                            (self.settings
 
764
#                                             ["interface"]))
 
765
            return super(IPv6_TCPServer, self).server_bind()
 
766
    def server_activate(self):
 
767
        if self.enabled:
 
768
            return super(IPv6_TCPServer, self).server_activate()
 
769
    def enable(self):
 
770
        self.enabled = True
196
771
 
197
772
 
198
773
def string_to_delta(interval):
208
783
    datetime.timedelta(1)
209
784
    >>> string_to_delta(u'1w')
210
785
    datetime.timedelta(7)
 
786
    >>> string_to_delta('5m 30s')
 
787
    datetime.timedelta(0, 330)
211
788
    """
212
 
    try:
213
 
        suffix=unicode(interval[-1])
214
 
        value=int(interval[:-1])
215
 
        if suffix == u"d":
216
 
            delta = datetime.timedelta(value)
217
 
        elif suffix == u"s":
218
 
            delta = datetime.timedelta(0, value)
219
 
        elif suffix == u"m":
220
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
221
 
        elif suffix == u"h":
222
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
223
 
        elif suffix == u"w":
224
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
225
 
        else:
 
789
    timevalue = datetime.timedelta(0)
 
790
    for s in interval.split():
 
791
        try:
 
792
            suffix = unicode(s[-1])
 
793
            value = int(s[:-1])
 
794
            if suffix == u"d":
 
795
                delta = datetime.timedelta(value)
 
796
            elif suffix == u"s":
 
797
                delta = datetime.timedelta(0, value)
 
798
            elif suffix == u"m":
 
799
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
800
            elif suffix == u"h":
 
801
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
802
            elif suffix == u"w":
 
803
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
804
            else:
 
805
                raise ValueError
 
806
        except (ValueError, IndexError):
226
807
            raise ValueError
227
 
    except (ValueError, IndexError):
228
 
        raise ValueError
229
 
    return delta
 
808
        timevalue += delta
 
809
    return timevalue
 
810
 
 
811
 
 
812
def server_state_changed(state):
 
813
    """Derived from the Avahi example code"""
 
814
    if state == avahi.SERVER_COLLISION:
 
815
        logger.error(u"Zeroconf server name collision")
 
816
        service.remove()
 
817
    elif state == avahi.SERVER_RUNNING:
 
818
        service.add()
 
819
 
 
820
 
 
821
def entry_group_state_changed(state, error):
 
822
    """Derived from the Avahi example code"""
 
823
    logger.debug(u"Avahi state change: %i", state)
 
824
    
 
825
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
826
        logger.debug(u"Zeroconf service established.")
 
827
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
828
        logger.warning(u"Zeroconf service name collision.")
 
829
        service.rename()
 
830
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
831
        logger.critical(u"Avahi: Error in group state changed %s",
 
832
                        unicode(error))
 
833
        raise AvahiGroupError("State changed: %s", str(error))
 
834
 
 
835
def if_nametoindex(interface):
 
836
    """Call the C function if_nametoindex(), or equivalent"""
 
837
    global if_nametoindex
 
838
    try:
 
839
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
840
                          (ctypes.util.find_library("c"))
 
841
                          .if_nametoindex)
 
842
    except (OSError, AttributeError):
 
843
        if "struct" not in sys.modules:
 
844
            import struct
 
845
        if "fcntl" not in sys.modules:
 
846
            import fcntl
 
847
        def if_nametoindex(interface):
 
848
            "Get an interface index the hard way, i.e. using fcntl()"
 
849
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
850
            with closing(socket.socket()) as s:
 
851
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
852
                                    struct.pack("16s16x", interface))
 
853
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
854
            return interface_index
 
855
    return if_nametoindex(interface)
 
856
 
 
857
 
 
858
def daemon(nochdir = False, noclose = False):
 
859
    """See daemon(3).  Standard BSD Unix function.
 
860
    This should really exist as os.daemon, but it doesn't (yet)."""
 
861
    if os.fork():
 
862
        sys.exit()
 
863
    os.setsid()
 
864
    if not nochdir:
 
865
        os.chdir("/")
 
866
    if os.fork():
 
867
        sys.exit()
 
868
    if not noclose:
 
869
        # Close all standard open file descriptors
 
870
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
871
        if not stat.S_ISCHR(os.fstat(null).st_mode):
 
872
            raise OSError(errno.ENODEV,
 
873
                          "/dev/null not a character device")
 
874
        os.dup2(null, sys.stdin.fileno())
 
875
        os.dup2(null, sys.stdout.fileno())
 
876
        os.dup2(null, sys.stderr.fileno())
 
877
        if null > 2:
 
878
            os.close(null)
230
879
 
231
880
 
232
881
def main():
233
 
    parser = OptionParser()
 
882
    parser = OptionParser(version = "%%prog %s" % version)
234
883
    parser.add_option("-i", "--interface", type="string",
235
 
                      default="eth0", metavar="IF",
236
 
                      help="Interface to bind to")
237
 
    parser.add_option("--cert", type="string", default="cert.pem",
238
 
                      metavar="FILE",
239
 
                      help="Public key certificate to use")
240
 
    parser.add_option("--key", type="string", default="key.pem",
241
 
                      metavar="FILE",
242
 
                      help="Private key to use")
243
 
    parser.add_option("--ca", type="string", default="ca.pem",
244
 
                      metavar="FILE",
245
 
                      help="Certificate Authority certificate to use")
246
 
    parser.add_option("--crl", type="string", default="crl.pem",
247
 
                      metavar="FILE",
248
 
                      help="Certificate Revokation List to use")
249
 
    parser.add_option("-p", "--port", type="int", default=49001,
 
884
                      metavar="IF", help="Bind to interface IF")
 
885
    parser.add_option("-a", "--address", type="string",
 
886
                      help="Address to listen for requests on")
 
887
    parser.add_option("-p", "--port", type="int",
250
888
                      help="Port number to receive requests on")
251
 
    parser.add_option("--dh", type="int", metavar="BITS",
252
 
                      help="DH group to use")
253
 
    parser.add_option("-t", "--timeout", type="string", # Parsed later
254
 
                      default="15m",
255
 
                      help="Amount of downtime allowed for clients")
256
 
    parser.add_option("--interval", type="string", # Parsed later
257
 
                      default="5m",
258
 
                      help="How often to check that a client is up")
259
889
    parser.add_option("--check", action="store_true", default=False,
260
890
                      help="Run self-test")
261
 
    (options, args) = parser.parse_args()
262
 
 
 
891
    parser.add_option("--debug", action="store_true",
 
892
                      help="Debug mode; run in foreground and log to"
 
893
                      " terminal")
 
894
    parser.add_option("--priority", type="string", help="GnuTLS"
 
895
                      " priority string (see GnuTLS documentation)")
 
896
    parser.add_option("--servicename", type="string", metavar="NAME",
 
897
                      help="Zeroconf service name")
 
898
    parser.add_option("--configdir", type="string",
 
899
                      default="/etc/mandos", metavar="DIR",
 
900
                      help="Directory to search for configuration"
 
901
                      " files")
 
902
    options = parser.parse_args()[0]
 
903
    
263
904
    if options.check:
264
905
        import doctest
265
906
        doctest.testmod()
266
907
        sys.exit()
267
908
    
268
 
    # Parse the time arguments
269
 
    try:
270
 
        options.timeout = string_to_delta(options.timeout)
271
 
    except ValueError:
272
 
        parser.error("option --timeout: Unparseable time")
273
 
    
274
 
    try:
275
 
        options.interval = string_to_delta(options.interval)
276
 
    except ValueError:
277
 
        parser.error("option --interval: Unparseable time")
278
 
    
279
 
    cert = gnutls.crypto.X509Certificate(open(options.cert).read())
280
 
    key = gnutls.crypto.X509PrivateKey(open(options.key).read())
281
 
    ca = gnutls.crypto.X509Certificate(open(options.ca).read())
282
 
    crl = gnutls.crypto.X509CRL(open(options.crl).read())
283
 
    cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
284
 
    
285
 
    # Parse config file
286
 
    defaults = {}
287
 
    client_config_object = ConfigParser.SafeConfigParser(defaults)
288
 
    client_config_object.read("mandos-clients.conf")
289
 
    clients = Set(Client(name=section, options=options,
290
 
                         **(dict(client_config_object\
291
 
                                 .items(section))))
292
 
                  for section in client_config_object.sections())
293
 
    
294
 
    in6addr_any = "::"
295
 
    udp_server = IPv6_UDPServer((in6addr_any, options.port),
296
 
                                udp_handler,
297
 
                                options=options)
298
 
    
299
 
    tcp_server = IPv6_TCPServer((in6addr_any, options.port),
300
 
                                tcp_handler,
301
 
                                options=options,
302
 
                                clients=clients,
303
 
                                credentials=cred)
304
 
    
305
 
    while True:
 
909
    # Default values for config file for server-global settings
 
910
    server_defaults = { "interface": "",
 
911
                        "address": "",
 
912
                        "port": "",
 
913
                        "debug": "False",
 
914
                        "priority":
 
915
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
916
                        "servicename": "Mandos",
 
917
                        }
 
918
    
 
919
    # Parse config file for server-global settings
 
920
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
921
    del server_defaults
 
922
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
923
    # Convert the SafeConfigParser object to a dict
 
924
    server_settings = server_config.defaults()
 
925
    # Use getboolean on the boolean config option
 
926
    server_settings["debug"] = (server_config.getboolean
 
927
                                ("DEFAULT", "debug"))
 
928
    del server_config
 
929
    
 
930
    # Override the settings from the config file with command line
 
931
    # options, if set.
 
932
    for option in ("interface", "address", "port", "debug",
 
933
                   "priority", "servicename", "configdir"):
 
934
        value = getattr(options, option)
 
935
        if value is not None:
 
936
            server_settings[option] = value
 
937
    del options
 
938
    # Now we have our good server settings in "server_settings"
 
939
    
 
940
    debug = server_settings["debug"]
 
941
    
 
942
    if not debug:
 
943
        syslogger.setLevel(logging.WARNING)
 
944
        console.setLevel(logging.WARNING)
 
945
    
 
946
    if server_settings["servicename"] != "Mandos":
 
947
        syslogger.setFormatter(logging.Formatter
 
948
                               ('Mandos (%s): %%(levelname)s:'
 
949
                                ' %%(message)s'
 
950
                                % server_settings["servicename"]))
 
951
    
 
952
    # Parse config file with clients
 
953
    client_defaults = { "timeout": "1h",
 
954
                        "interval": "5m",
 
955
                        "checker": "fping -q -- %(host)s",
 
956
                        "host": "",
 
957
                        }
 
958
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
959
    client_config.read(os.path.join(server_settings["configdir"],
 
960
                                    "clients.conf"))
 
961
    
 
962
    clients = Set()
 
963
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
964
                                 server_settings["port"]),
 
965
                                TCP_handler,
 
966
                                settings=server_settings,
 
967
                                clients=clients)
 
968
    pidfilename = "/var/run/mandos.pid"
 
969
    try:
 
970
        pidfile = open(pidfilename, "w")
 
971
    except IOError, error:
 
972
        logger.error("Could not open file %r", pidfilename)
 
973
    
 
974
    uid = 65534
 
975
    gid = 65534
 
976
    try:
 
977
        uid = pwd.getpwnam("mandos").pw_uid
 
978
    except KeyError:
 
979
        try:
 
980
            uid = pwd.getpwnam("nobody").pw_uid
 
981
        except KeyError:
 
982
            pass
 
983
    try:
 
984
        gid = pwd.getpwnam("mandos").pw_gid
 
985
    except KeyError:
 
986
        try:
 
987
            gid = pwd.getpwnam("nogroup").pw_gid
 
988
        except KeyError:
 
989
            pass
 
990
    try:
 
991
        os.setuid(uid)
 
992
        os.setgid(gid)
 
993
    except OSError, error:
 
994
        if error[0] != errno.EPERM:
 
995
            raise error
 
996
    
 
997
    global service
 
998
    service = AvahiService(name = server_settings["servicename"],
 
999
                           servicetype = "_mandos._tcp", )
 
1000
    if server_settings["interface"]:
 
1001
        service.interface = (if_nametoindex
 
1002
                             (server_settings["interface"]))
 
1003
    
 
1004
    global main_loop
 
1005
    global bus
 
1006
    global server
 
1007
    # From the Avahi example code
 
1008
    DBusGMainLoop(set_as_default=True )
 
1009
    main_loop = gobject.MainLoop()
 
1010
    bus = dbus.SystemBus()
 
1011
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
1012
                                           avahi.DBUS_PATH_SERVER),
 
1013
                            avahi.DBUS_INTERFACE_SERVER)
 
1014
    # End of Avahi example code
 
1015
    bus_name = dbus.service.BusName(u"org.mandos-system.Mandos", bus)
 
1016
    
 
1017
    def remove_from_clients(client):
 
1018
        clients.remove(client)
306
1019
        if not clients:
307
 
            break
308
 
        try:
309
 
            next_stop = min(client.next_stop() for client in clients)
310
 
            now = datetime.datetime.now()
311
 
            if next_stop > now:
312
 
                delay = next_stop - now
313
 
                delay_seconds = (delay.days * 24 * 60 * 60
314
 
                                 + delay.seconds
315
 
                                 + delay.microseconds / 1000000)
316
 
                clients_with_checkers = tuple(client for client in
317
 
                                              clients
318
 
                                              if client.checker
319
 
                                              is not None)
320
 
                input_checks = (udp_server, tcp_server) \
321
 
                               + clients_with_checkers
322
 
                print "Waiting for network",
323
 
                if clients_with_checkers:
324
 
                    print "and checkers for:",
325
 
                    for client in clients_with_checkers:
326
 
                        print client.name,
327
 
                print
328
 
                input, out, err = select.select(input_checks, (), (),
329
 
                                                delay_seconds)
330
 
                for obj in input:
331
 
                    obj.handle_request()
332
 
            # start new checkers
333
 
            for client in clients:
334
 
                if client.it_is_time_to_check(now=now) and \
335
 
                       client.checker is None:
336
 
                    print "Starting checker for client %(name)s" \
337
 
                          % vars(client)
338
 
                    client.start_checker()
339
 
            # delete timed-out clients
340
 
            for client in clients.copy():
341
 
                if not client.still_valid(now=now):
342
 
                    # log xxx
343
 
                    print "Removing client %(name)s" % vars(client)
344
 
                    clients.remove(client)
345
 
        except KeyboardInterrupt:
346
 
            break
347
 
    
348
 
    # Cleanup here
 
1020
            logger.critical(u"No clients left, exiting")
 
1021
            sys.exit()
 
1022
    
 
1023
    clients.update(Set(Client(name = section,
 
1024
                              stop_hook = remove_from_clients,
 
1025
                              config
 
1026
                              = dict(client_config.items(section)))
 
1027
                       for section in client_config.sections()))
 
1028
    if not clients:
 
1029
        logger.critical(u"No clients defined")
 
1030
        sys.exit(1)
 
1031
    
 
1032
    if debug:
 
1033
        # Redirect stdin so all checkers get /dev/null
 
1034
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1035
        os.dup2(null, sys.stdin.fileno())
 
1036
        if null > 2:
 
1037
            os.close(null)
 
1038
    else:
 
1039
        # No console logging
 
1040
        logger.removeHandler(console)
 
1041
        # Close all input and output, do double fork, etc.
 
1042
        daemon()
 
1043
    
 
1044
    try:
 
1045
        pid = os.getpid()
 
1046
        pidfile.write(str(pid) + "\n")
 
1047
        pidfile.close()
 
1048
        del pidfile
 
1049
    except IOError:
 
1050
        logger.error(u"Could not write to file %r with PID %d",
 
1051
                     pidfilename, pid)
 
1052
    except NameError:
 
1053
        # "pidfile" was never created
 
1054
        pass
 
1055
    del pidfilename
 
1056
    
 
1057
    def cleanup():
 
1058
        "Cleanup function; run on exit"
 
1059
        global group
 
1060
        # From the Avahi example code
 
1061
        if not group is None:
 
1062
            group.Free()
 
1063
            group = None
 
1064
        # End of Avahi example code
 
1065
        
 
1066
        while clients:
 
1067
            client = clients.pop()
 
1068
            client.stop_hook = None
 
1069
            client.stop()
 
1070
    
 
1071
    atexit.register(cleanup)
 
1072
    
 
1073
    if not debug:
 
1074
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1075
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1076
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1077
    
349
1078
    for client in clients:
350
 
        client.stop_checker()
351
 
 
352
 
 
353
 
if __name__ == "__main__":
 
1079
        client.start()
 
1080
    
 
1081
    tcp_server.enable()
 
1082
    tcp_server.server_activate()
 
1083
    
 
1084
    # Find out what port we got
 
1085
    service.port = tcp_server.socket.getsockname()[1]
 
1086
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
1087
                u" scope_id %d" % tcp_server.socket.getsockname())
 
1088
    
 
1089
    #service.interface = tcp_server.socket.getsockname()[3]
 
1090
    
 
1091
    try:
 
1092
        # From the Avahi example code
 
1093
        server.connect_to_signal("StateChanged", server_state_changed)
 
1094
        try:
 
1095
            server_state_changed(server.GetState())
 
1096
        except dbus.exceptions.DBusException, error:
 
1097
            logger.critical(u"DBusException: %s", error)
 
1098
            sys.exit(1)
 
1099
        # End of Avahi example code
 
1100
        
 
1101
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
1102
                             lambda *args, **kwargs:
 
1103
                             (tcp_server.handle_request
 
1104
                              (*args[2:], **kwargs) or True))
 
1105
        
 
1106
        logger.debug(u"Starting main loop")
 
1107
        main_loop.run()
 
1108
    except AvahiError, error:
 
1109
        logger.critical(u"AvahiError: %s" + unicode(error))
 
1110
        sys.exit(1)
 
1111
    except KeyboardInterrupt:
 
1112
        if debug:
 
1113
            print
 
1114
 
 
1115
if __name__ == '__main__':
354
1116
    main()
355