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  • Committer: Teddy Hogeborn
  • Date: 2008-07-19 18:43:24 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080719184324-iwhoa5in75xa0u2u
* mandos-clients.conf ([foo]/dn, [foo]/password, [braxen_client]/dn,
                       [braxen_client]/password): Removed.
  ([foo]/fingerprint, [braxen_client]/fingerprint): New.
  ([foo]/checker): New.
  ([foo]/secfile): New.
  ([braxen_client]/secret): New.

* server.py: New "--debug" option to set debug flag.  Removed "cert",
             "key", "ca", "crl", and "cred" variables.  Added default
             value for "checker" config file setting.  Do not pass
             credentials to IPv6_TCPServer constructor.
  (debug): New global debug flag.  Used by most debugging output code.
  (Client.__init__): Keyword argument "dn" replaced by "fingerprint",
                     "password" renamed to "secret", and "passfile"
                     renamed to "secfile".  New keyword argument
                     "checker". All callers changed.
  (Client.dn): Removed.
  (Client.fingerprint): New.
  (Client.password): Renamed to "secret"; all users changed.
  (Client.passfile): Renamed to "secfile"; all users changed.
  (Client.timeout, Client.interval): Changed to be properties; now
                                     automatically updates the
                                     "_timeout_milliseconds" and
                                     "_interval_milliseconds" values.
  (Client.timeout_milliseconds): Renamed to "_timeout_milliseconds".
  (Client.interval_milliseconds): Renamed to "_interval_milliseconds".
  (Client.check_command): New.
  (Client.start_checker): Use the new "check_command" attribute.
  (peer_certificate, fingerprint): New functions.

  (tcp_handler.handle): Use ClientSession with empty credentials
                        object instead of ServerSession.  Set gnutls
                        priority string.  Do not verify peer.  Use
                        fingerprint instead of DN when searching for
                        clients.  Bug fix: Loop sending data so even large
                        secret data strings are sent.
  (IPv6_TCPServer.credentials): Removed.
  (if_nametoindex): Do not import ctypes since that is now imported
                    globally.

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server.py
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 & Björn Påhlsson
15
 
# 
16
 
# This program is free software: you can redistribute it and/or modify
17
 
# it under the terms of the GNU General Public License as published by
18
 
# the Free Software Foundation, either version 3 of the License, or
19
 
# (at your option) any later version.
20
 
#
21
 
#     This program is distributed in the hope that it will be useful,
22
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
23
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
24
 
#     GNU General Public License for more details.
25
 
# 
26
 
# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see
28
 
# <http://www.gnu.org/licenses/>.
29
 
# 
30
 
# Contact the authors at <mandos@fukt.bsnet.se>.
31
 
# 
32
2
 
33
 
from __future__ import division, with_statement, absolute_import
 
3
from __future__ import division
34
4
 
35
5
import SocketServer
36
6
import socket
 
7
import select
37
8
from optparse import OptionParser
38
9
import datetime
39
10
import errno
50
21
import signal
51
22
from sets import Set
52
23
import subprocess
53
 
import atexit
54
 
import stat
55
 
import logging
56
 
import logging.handlers
57
 
import pwd
58
 
from contextlib import closing
59
24
 
60
25
import dbus
61
26
import gobject
62
27
import avahi
63
28
from dbus.mainloop.glib import DBusGMainLoop
64
29
import ctypes
65
 
import ctypes.util
66
 
 
67
 
version = "1.0.2"
68
 
 
69
 
logger = logging.Logger('mandos')
70
 
syslogger = logging.handlers.SysLogHandler\
71
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
72
 
             address = "/dev/log")
73
 
syslogger.setFormatter(logging.Formatter\
74
 
                        ('Mandos: %(levelname)s: %(message)s'))
75
 
logger.addHandler(syslogger)
76
 
 
77
 
console = logging.StreamHandler()
78
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
79
 
                                       ' %(message)s'))
80
 
logger.addHandler(console)
81
 
 
82
 
class AvahiError(Exception):
83
 
    def __init__(self, value):
84
 
        self.value = value
85
 
        super(AvahiError, self).__init__()
86
 
    def __str__(self):
87
 
        return repr(self.value)
88
 
 
89
 
class AvahiServiceError(AvahiError):
90
 
    pass
91
 
 
92
 
class AvahiGroupError(AvahiError):
93
 
    pass
94
 
 
95
 
 
96
 
class AvahiService(object):
97
 
    """An Avahi (Zeroconf) service.
98
 
    Attributes:
99
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
100
 
               Used to optionally bind to the specified interface.
101
 
    name: string; Example: 'Mandos'
102
 
    type: string; Example: '_mandos._tcp'.
103
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
104
 
    port: integer; what port to announce
105
 
    TXT: list of strings; TXT record for the service
106
 
    domain: string; Domain to publish on, default to .local if empty.
107
 
    host: string; Host to publish records for, default is localhost
108
 
    max_renames: integer; maximum number of renames
109
 
    rename_count: integer; counter so we only rename after collisions
110
 
                  a sensible number of times
111
 
    """
112
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
113
 
                 servicetype = None, port = None, TXT = None, domain = "",
114
 
                 host = "", max_renames = 32768):
115
 
        self.interface = interface
116
 
        self.name = name
117
 
        self.type = servicetype
118
 
        self.port = port
119
 
        if TXT is None:
120
 
            self.TXT = []
121
 
        else:
122
 
            self.TXT = TXT
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("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\
152
 
                    (bus.get_object(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
 
30
 
 
31
# This variable is used to optionally bind to a specified interface.
 
32
# It is a global variable to fit in with the other variables from the
 
33
# Avahi server example code.
 
34
serviceInterface = avahi.IF_UNSPEC
 
35
# From the Avahi server example code:
 
36
serviceName = "Mandos"
 
37
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
38
servicePort = None                      # Not known at startup
 
39
serviceTXT = []                         # TXT record for the service
 
40
domain = ""                  # Domain to publish on, default to .local
 
41
host = ""          # Host to publish records for, default to localhost
 
42
group = None #our entry group
 
43
rename_count = 12       # Counter so we only rename after collisions a
 
44
                        # sensible number of times
171
45
# End of Avahi example code
172
46
 
173
47
 
178
52
    fingerprint: string (40 or 32 hexadecimal digits); used to
179
53
                 uniquely identify the client
180
54
    secret:    bytestring; sent verbatim (over TLS) to client
181
 
    host:      string; available for use by the checker command
182
 
    created:   datetime.datetime(); object creation, not client host
183
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
184
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
185
 
                                     until this client is invalid
 
55
    fqdn:      string (FQDN); available for use by the checker command
 
56
    created:   datetime.datetime()
 
57
    last_seen: datetime.datetime() or None if not yet seen
 
58
    timeout:   datetime.timedelta(); How long from last_seen until
 
59
                                     this client is invalid
186
60
    interval:  datetime.timedelta(); How often to start a new checker
187
61
    stop_hook: If set, called by stop() as stop_hook(self)
188
62
    checker:   subprocess.Popen(); a running checker process used
189
63
                                   to see if the client lives.
190
 
                                   'None' if no process is running.
 
64
                                   Is None if no process is running.
191
65
    checker_initiator_tag: a gobject event source tag, or None
192
66
    stop_initiator_tag:    - '' -
193
67
    checker_callback_tag:  - '' -
194
68
    checker_command: string; External command which is run to check if
195
 
                     client lives.  %() expansions are done at
 
69
                     client lives.  %()s expansions are done at
196
70
                     runtime with vars(self) as dict, so that for
197
71
                     instance %(name)s can be used in the command.
198
72
    Private attibutes:
199
73
    _timeout: Real variable for 'timeout'
200
74
    _interval: Real variable for 'interval'
201
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
75
    _timeout_milliseconds: Used by gobject.timeout_add()
202
76
    _interval_milliseconds: - '' -
203
77
    """
204
78
    def _set_timeout(self, timeout):
224
98
    interval = property(lambda self: self._interval,
225
99
                        _set_interval)
226
100
    del _set_interval
227
 
    def __init__(self, name = None, stop_hook=None, config=None):
228
 
        """Note: the 'checker' key in 'config' sets the
229
 
        'checker_command' attribute and *not* the 'checker'
230
 
        attribute."""
231
 
        if config is None:
232
 
            config = {}
 
101
    def __init__(self, name=None, options=None, stop_hook=None,
 
102
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
103
                 timeout=None, interval=-1, checker=None):
233
104
        self.name = name
234
 
        logger.debug(u"Creating client %r", self.name)
235
 
        # Uppercase and remove spaces from fingerprint for later
236
 
        # comparison purposes with return value from the fingerprint()
237
 
        # function
238
 
        self.fingerprint = config["fingerprint"].upper()\
239
 
                           .replace(u" ", u"")
240
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
241
 
        if "secret" in config:
242
 
            self.secret = config["secret"].decode(u"base64")
243
 
        elif "secfile" in config:
244
 
            with closing(open(os.path.expanduser
245
 
                              (os.path.expandvars
246
 
                               (config["secfile"])))) \
247
 
                               as secfile:
248
 
                self.secret = secfile.read()
 
105
        # Uppercase and remove spaces from fingerprint
 
106
        # for later comparison purposes with return value of
 
107
        # the fingerprint() function
 
108
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
109
        if secret:
 
110
            self.secret = secret.decode(u"base64")
 
111
        elif secfile:
 
112
            sf = open(secfile)
 
113
            self.secret = sf.read()
 
114
            sf.close()
249
115
        else:
250
 
            raise TypeError(u"No secret or secfile for client %s"
251
 
                            % self.name)
252
 
        self.host = config.get("host", "")
 
116
            raise RuntimeError(u"No secret or secfile for client %s"
 
117
                               % self.name)
 
118
        self.fqdn = fqdn                # string
253
119
        self.created = datetime.datetime.now()
254
 
        self.last_checked_ok = None
255
 
        self.timeout = string_to_delta(config["timeout"])
256
 
        self.interval = string_to_delta(config["interval"])
 
120
        self.last_seen = None
 
121
        if timeout is None:
 
122
            timeout = options.timeout
 
123
        self.timeout = timeout
 
124
        if interval == -1:
 
125
            interval = options.interval
 
126
        else:
 
127
            interval = string_to_delta(interval)
 
128
        self.interval = interval
257
129
        self.stop_hook = stop_hook
258
130
        self.checker = None
259
131
        self.checker_initiator_tag = None
260
132
        self.stop_initiator_tag = None
261
133
        self.checker_callback_tag = None
262
 
        self.check_command = config["checker"]
 
134
        self.check_command = checker
263
135
    def start(self):
264
 
        """Start this client's checker and timeout hooks"""
 
136
        """Start this clients checker and timeout hooks"""
265
137
        # Schedule a new checker to be started an 'interval' from now,
266
138
        # and every interval from then on.
267
139
        self.checker_initiator_tag = gobject.timeout_add\
275
147
                                   self.stop)
276
148
    def stop(self):
277
149
        """Stop this client.
278
 
        The possibility that a client might be restarted is left open,
279
 
        but not currently used."""
280
 
        # If this client doesn't have a secret, it is already stopped.
281
 
        if hasattr(self, "secret") and self.secret:
282
 
            logger.info(u"Stopping client %s", self.name)
283
 
            self.secret = None
284
 
        else:
285
 
            return False
286
 
        if getattr(self, "stop_initiator_tag", False):
 
150
        The possibility that this client might be restarted is left
 
151
        open, but not currently used."""
 
152
        if debug:
 
153
            sys.stderr.write(u"Stopping client %s\n" % self.name)
 
154
        self.secret = None
 
155
        if self.stop_initiator_tag:
287
156
            gobject.source_remove(self.stop_initiator_tag)
288
157
            self.stop_initiator_tag = None
289
 
        if getattr(self, "checker_initiator_tag", False):
 
158
        if self.checker_initiator_tag:
290
159
            gobject.source_remove(self.checker_initiator_tag)
291
160
            self.checker_initiator_tag = None
292
161
        self.stop_checker()
295
164
        # Do not run this again if called by a gobject.timeout_add
296
165
        return False
297
166
    def __del__(self):
298
 
        self.stop_hook = None
299
 
        self.stop()
 
167
        # Some code duplication here and in stop()
 
168
        if hasattr(self, "stop_initiator_tag") \
 
169
               and self.stop_initiator_tag:
 
170
            gobject.source_remove(self.stop_initiator_tag)
 
171
            self.stop_initiator_tag = None
 
172
        if hasattr(self, "checker_initiator_tag") \
 
173
               and self.checker_initiator_tag:
 
174
            gobject.source_remove(self.checker_initiator_tag)
 
175
            self.checker_initiator_tag = None
 
176
        self.stop_checker()
300
177
    def checker_callback(self, pid, condition):
301
178
        """The checker has completed, so take appropriate actions."""
302
 
        self.checker_callback_tag = None
303
 
        self.checker = None
 
179
        now = datetime.datetime.now()
304
180
        if os.WIFEXITED(condition) \
305
181
               and (os.WEXITSTATUS(condition) == 0):
306
 
            logger.info(u"Checker for %(name)s succeeded",
307
 
                        vars(self))
308
 
            self.bump_timeout()
309
 
        elif not os.WIFEXITED(condition):
310
 
            logger.warning(u"Checker for %(name)s crashed?",
311
 
                           vars(self))
312
 
        else:
313
 
            logger.info(u"Checker for %(name)s failed",
314
 
                        vars(self))
315
 
    def bump_timeout(self):
316
 
        """Bump up the timeout for this client.
317
 
        This should only be called when the client has been seen,
318
 
        alive and well.
319
 
        """
320
 
        self.last_checked_ok = datetime.datetime.now()
321
 
        gobject.source_remove(self.stop_initiator_tag)
322
 
        self.stop_initiator_tag = gobject.timeout_add\
323
 
            (self._timeout_milliseconds, self.stop)
 
182
            if debug:
 
183
                sys.stderr.write(u"Checker for %(name)s succeeded\n"
 
184
                                 % vars(self))
 
185
            self.last_seen = now
 
186
            gobject.source_remove(self.stop_initiator_tag)
 
187
            self.stop_initiator_tag = gobject.timeout_add\
 
188
                                      (self._timeout_milliseconds,
 
189
                                       self.stop)
 
190
        elif debug:
 
191
            if not os.WIFEXITED(condition):
 
192
                sys.stderr.write(u"Checker for %(name)s crashed?\n"
 
193
                                 % vars(self))
 
194
            else:
 
195
                sys.stderr.write(u"Checker for %(name)s failed\n"
 
196
                                 % vars(self))
 
197
        self.checker = None
 
198
        self.checker_callback_tag = None
324
199
    def start_checker(self):
325
200
        """Start a new checker subprocess if one is not running.
326
201
        If a checker already exists, leave it running and do
327
202
        nothing."""
328
 
        # The reason for not killing a running checker is that if we
329
 
        # did that, then if a checker (for some reason) started
330
 
        # running slowly and taking more than 'interval' time, the
331
 
        # client would inevitably timeout, since no checker would get
332
 
        # a chance to run to completion.  If we instead leave running
333
 
        # checkers alone, the checker would have to take more time
334
 
        # than 'timeout' for the client to be declared invalid, which
335
 
        # is as it should be.
336
203
        if self.checker is None:
 
204
            if debug:
 
205
                sys.stderr.write(u"Starting checker for %s\n"
 
206
                                 % self.name)
337
207
            try:
338
 
                # In case check_command has exactly one % operator
339
 
                command = self.check_command % self.host
 
208
                command = self.check_command % self.fqdn
340
209
            except TypeError:
341
 
                # Escape attributes for the shell
342
210
                escaped_attrs = dict((key, re.escape(str(val)))
343
211
                                     for key, val in
344
212
                                     vars(self).iteritems())
345
 
                try:
346
 
                    command = self.check_command % escaped_attrs
347
 
                except TypeError, error:
348
 
                    logger.error(u'Could not format string "%s":'
349
 
                                 u' %s', self.check_command, error)
350
 
                    return True # Try again later
 
213
                command = self.check_command % escaped_attrs
351
214
            try:
352
 
                logger.info(u"Starting checker %r for %s",
353
 
                            command, self.name)
354
 
                # We don't need to redirect stdout and stderr, since
355
 
                # in normal mode, that is already done by daemon(),
356
 
                # and in debug mode we don't want to.  (Stdin is
357
 
                # always replaced by /dev/null.)
358
 
                self.checker = subprocess.Popen(command,
359
 
                                                close_fds=True,
360
 
                                                shell=True, cwd="/")
361
 
                self.checker_callback_tag = gobject.child_watch_add\
362
 
                                            (self.checker.pid,
363
 
                                             self.checker_callback)
364
 
            except OSError, error:
365
 
                logger.error(u"Failed to start subprocess: %s",
366
 
                             error)
 
215
                self.checker = subprocess.\
 
216
                               Popen(command,
 
217
                                     stdout=subprocess.PIPE,
 
218
                                     close_fds=True, shell=True,
 
219
                                     cwd="/")
 
220
                self.checker_callback_tag = gobject.\
 
221
                                            child_watch_add(self.checker.pid,
 
222
                                                            self.\
 
223
                                                            checker_callback)
 
224
            except subprocess.OSError, error:
 
225
                sys.stderr.write(u"Failed to start subprocess: %s\n"
 
226
                                 % error)
367
227
        # Re-run this periodically if run by gobject.timeout_add
368
228
        return True
369
229
    def stop_checker(self):
370
230
        """Force the checker process, if any, to stop."""
371
 
        if self.checker_callback_tag:
372
 
            gobject.source_remove(self.checker_callback_tag)
373
 
            self.checker_callback_tag = None
374
 
        if getattr(self, "checker", None) is None:
 
231
        if not hasattr(self, "checker") or self.checker is None:
375
232
            return
376
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
377
 
        try:
378
 
            os.kill(self.checker.pid, signal.SIGTERM)
379
 
            #os.sleep(0.5)
380
 
            #if self.checker.poll() is None:
381
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
382
 
        except OSError, error:
383
 
            if error.errno != errno.ESRCH: # No such process
384
 
                raise
 
233
        gobject.source_remove(self.checker_callback_tag)
 
234
        self.checker_callback_tag = None
 
235
        os.kill(self.checker.pid, signal.SIGTERM)
 
236
        if self.checker.poll() is None:
 
237
            os.kill(self.checker.pid, signal.SIGKILL)
385
238
        self.checker = None
386
 
    def still_valid(self):
 
239
    def still_valid(self, now=None):
387
240
        """Has the timeout not yet passed for this client?"""
388
 
        now = datetime.datetime.now()
389
 
        if self.last_checked_ok is None:
 
241
        if now is None:
 
242
            now = datetime.datetime.now()
 
243
        if self.last_seen is None:
390
244
            return now < (self.created + self.timeout)
391
245
        else:
392
 
            return now < (self.last_checked_ok + self.timeout)
 
246
            return now < (self.last_seen + self.timeout)
393
247
 
394
248
 
395
249
def peer_certificate(session):
396
 
    "Return the peer's OpenPGP certificate as a bytestring"
397
250
    # If not an OpenPGP certificate...
398
251
    if gnutls.library.functions.gnutls_certificate_type_get\
399
252
            (session._c_object) \
410
263
 
411
264
 
412
265
def fingerprint(openpgp):
413
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
266
    # New empty GnuTLS certificate
 
267
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
268
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
269
        (ctypes.byref(crt))
414
270
    # New GnuTLS "datum" with the OpenPGP public key
415
271
    datum = gnutls.library.types.gnutls_datum_t\
416
272
        (ctypes.cast(ctypes.c_char_p(openpgp),
417
273
                     ctypes.POINTER(ctypes.c_ubyte)),
418
274
         ctypes.c_uint(len(openpgp)))
419
 
    # New empty GnuTLS certificate
420
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
421
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
422
 
        (ctypes.byref(crt))
423
275
    # Import the OpenPGP public key into the certificate
424
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
425
 
                    (crt, ctypes.byref(datum),
426
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
427
 
    # Verify the self signature in the key
428
 
    crtverify = ctypes.c_uint()
429
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
430
 
        (crt, 0, ctypes.byref(crtverify))
431
 
    if crtverify.value != 0:
432
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
433
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
276
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
277
        (crt,
 
278
         ctypes.byref(datum),
 
279
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
434
280
    # New buffer for the fingerprint
435
 
    buf = ctypes.create_string_buffer(20)
436
 
    buf_len = ctypes.c_size_t()
 
281
    buffer = ctypes.create_string_buffer(20)
 
282
    buffer_length = ctypes.c_size_t()
437
283
    # Get the fingerprint from the certificate into the buffer
438
284
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
439
 
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
 
285
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
440
286
    # Deinit the certificate
441
287
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
442
288
    # Convert the buffer to a Python bytestring
443
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
289
    fpr = ctypes.string_at(buffer, buffer_length.value)
444
290
    # Convert the bytestring to hexadecimal notation
445
291
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
446
292
    return hex_fpr
447
293
 
448
294
 
449
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
295
class tcp_handler(SocketServer.BaseRequestHandler, object):
450
296
    """A TCP request handler class.
451
297
    Instantiated by IPv6_TCPServer for each request to handle it.
452
298
    Note: This will run in its own forked process."""
453
299
    
454
300
    def handle(self):
455
 
        logger.info(u"TCP connection from: %s",
456
 
                    unicode(self.client_address))
457
 
        session = gnutls.connection.ClientSession\
458
 
                  (self.request, gnutls.connection.X509Credentials())
459
 
        
460
 
        line = self.request.makefile().readline()
461
 
        logger.debug(u"Protocol version: %r", line)
462
 
        try:
463
 
            if int(line.strip().split()[0]) > 1:
464
 
                raise RuntimeError
465
 
        except (ValueError, IndexError, RuntimeError), error:
466
 
            logger.error(u"Unknown protocol version: %s", error)
467
 
            return
468
 
        
469
 
        # Note: gnutls.connection.X509Credentials is really a generic
470
 
        # GnuTLS certificate credentials object so long as no X.509
471
 
        # keys are added to it.  Therefore, we can use it here despite
472
 
        # using OpenPGP certificates.
 
301
        if debug:
 
302
            sys.stderr.write(u"TCP request came\n")
 
303
            sys.stderr.write(u"Request: %s\n" % self.request)
 
304
            sys.stderr.write(u"Client Address: %s\n"
 
305
                             % unicode(self.client_address))
 
306
            sys.stderr.write(u"Server: %s\n" % self.server)
 
307
        session = gnutls.connection.ClientSession(self.request,
 
308
                                                  gnutls.connection.\
 
309
                                                  X509Credentials())
473
310
        
474
311
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
475
312
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
476
313
        #                "+DHE-DSS"))
477
 
        # Use a fallback default, since this MUST be set.
478
 
        priority = self.server.settings.get("priority", "NORMAL")
 
314
        priority = "SECURE256"
 
315
        
479
316
        gnutls.library.functions.gnutls_priority_set_direct\
480
 
            (session._c_object, priority, None)
 
317
            (session._c_object, priority, None);
481
318
        
482
319
        try:
483
320
            session.handshake()
484
321
        except gnutls.errors.GNUTLSError, error:
485
 
            logger.warning(u"Handshake failed: %s", error)
 
322
            if debug:
 
323
                sys.stderr.write(u"Handshake failed: %s\n" % error)
486
324
            # Do not run session.bye() here: the session is not
487
325
            # established.  Just abandon the request.
488
326
            return
489
327
        try:
490
328
            fpr = fingerprint(peer_certificate(session))
491
329
        except (TypeError, gnutls.errors.GNUTLSError), error:
492
 
            logger.warning(u"Bad certificate: %s", error)
 
330
            if debug:
 
331
                sys.stderr.write(u"Bad certificate: %s\n" % error)
493
332
            session.bye()
494
333
            return
495
 
        logger.debug(u"Fingerprint: %s", fpr)
 
334
        if debug:
 
335
            sys.stderr.write(u"Fingerprint: %s\n" % fpr)
496
336
        client = None
497
 
        for c in self.server.clients:
 
337
        for c in clients:
498
338
            if c.fingerprint == fpr:
499
339
                client = c
500
340
                break
501
 
        if not client:
502
 
            logger.warning(u"Client not found for fingerprint: %s",
503
 
                           fpr)
504
 
            session.bye()
505
 
            return
506
341
        # Have to check if client.still_valid(), since it is possible
507
342
        # that the client timed out while establishing the GnuTLS
508
343
        # session.
509
 
        if not client.still_valid():
510
 
            logger.warning(u"Client %(name)s is invalid",
511
 
                           vars(client))
 
344
        if (not client) or (not client.still_valid()):
 
345
            if debug:
 
346
                if client:
 
347
                    sys.stderr.write(u"Client %(name)s is invalid\n"
 
348
                                     % vars(client))
 
349
                else:
 
350
                    sys.stderr.write(u"Client not found for "
 
351
                                     u"fingerprint: %s\n" % fpr)
512
352
            session.bye()
513
353
            return
514
 
        ## This won't work here, since we're in a fork.
515
 
        # client.bump_timeout()
516
354
        sent_size = 0
517
355
        while sent_size < len(client.secret):
518
356
            sent = session.send(client.secret[sent_size:])
519
 
            logger.debug(u"Sent: %d, remaining: %d",
520
 
                         sent, len(client.secret)
521
 
                         - (sent_size + sent))
 
357
            if debug:
 
358
                sys.stderr.write(u"Sent: %d, remaining: %d\n"
 
359
                                 % (sent, len(client.secret)
 
360
                                    - (sent_size + sent)))
522
361
            sent_size += sent
523
362
        session.bye()
524
363
 
525
364
 
526
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
527
 
                     SocketServer.TCPServer, object):
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
528
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
529
367
    Attributes:
530
 
        settings:       Server settings
 
368
        options:        Command line options
531
369
        clients:        Set() of Client objects
532
 
        enabled:        Boolean; whether this server is activated yet
533
370
    """
534
371
    address_family = socket.AF_INET6
535
372
    def __init__(self, *args, **kwargs):
536
 
        if "settings" in kwargs:
537
 
            self.settings = kwargs["settings"]
538
 
            del kwargs["settings"]
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
539
376
        if "clients" in kwargs:
540
377
            self.clients = kwargs["clients"]
541
378
            del kwargs["clients"]
542
 
        self.enabled = False
543
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
379
        return super(type(self), self).__init__(*args, **kwargs)
544
380
    def server_bind(self):
545
381
        """This overrides the normal server_bind() function
546
382
        to bind to an interface if one was specified, and also NOT to
547
383
        bind to an address or port if they were not specified."""
548
 
        if self.settings["interface"]:
549
 
            # 25 is from /usr/include/asm-i486/socket.h
550
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
551
388
            try:
552
389
                self.socket.setsockopt(socket.SOL_SOCKET,
553
 
                                       SO_BINDTODEVICE,
554
 
                                       self.settings["interface"])
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
555
392
            except socket.error, error:
556
393
                if error[0] == errno.EPERM:
557
 
                    logger.error(u"No permission to"
558
 
                                 u" bind to interface %s",
559
 
                                 self.settings["interface"])
 
394
                    sys.stderr.write(u"Warning: No permission to" \
 
395
                                     u" bind to interface %s\n"
 
396
                                     % self.options.interface)
560
397
                else:
561
398
                    raise error
562
399
        # Only bind(2) the socket if we really need to.
565
402
                in6addr_any = "::"
566
403
                self.server_address = (in6addr_any,
567
404
                                       self.server_address[1])
568
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
569
406
                self.server_address = (self.server_address[0],
570
407
                                       0)
571
 
#                 if self.settings["interface"]:
572
 
#                     self.server_address = (self.server_address[0],
573
 
#                                            0, # port
574
 
#                                            0, # flowinfo
575
 
#                                            if_nametoindex
576
 
#                                            (self.settings
577
 
#                                             ["interface"]))
578
 
            return super(IPv6_TCPServer, self).server_bind()
579
 
    def server_activate(self):
580
 
        if self.enabled:
581
 
            return super(IPv6_TCPServer, self).server_activate()
582
 
    def enable(self):
583
 
        self.enabled = True
 
408
            return super(type(self), self).server_bind()
584
409
 
585
410
 
586
411
def string_to_delta(interval):
596
421
    datetime.timedelta(1)
597
422
    >>> string_to_delta(u'1w')
598
423
    datetime.timedelta(7)
599
 
    >>> string_to_delta('5m 30s')
600
 
    datetime.timedelta(0, 330)
601
424
    """
602
 
    timevalue = datetime.timedelta(0)
603
 
    for s in interval.split():
604
 
        try:
605
 
            suffix = unicode(s[-1])
606
 
            value = int(s[:-1])
607
 
            if suffix == u"d":
608
 
                delta = datetime.timedelta(value)
609
 
            elif suffix == u"s":
610
 
                delta = datetime.timedelta(0, value)
611
 
            elif suffix == u"m":
612
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
613
 
            elif suffix == u"h":
614
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
615
 
            elif suffix == u"w":
616
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
617
 
            else:
618
 
                raise ValueError
619
 
        except (ValueError, IndexError):
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
620
439
            raise ValueError
621
 
        timevalue += delta
622
 
    return timevalue
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    if debug:
 
457
        sys.stderr.write(u"Adding service '%s' of type '%s' ...\n"
 
458
                         % (serviceName, serviceType))
 
459
    
 
460
    group.AddService(
 
461
            serviceInterface,           # interface
 
462
            avahi.PROTO_INET6,          # protocol
 
463
            dbus.UInt32(0),             # flags
 
464
            serviceName, serviceType,
 
465
            domain, host,
 
466
            dbus.UInt16(servicePort),
 
467
            avahi.string_array_to_txt_array(serviceTXT))
 
468
    group.Commit()
 
469
 
 
470
 
 
471
def remove_service():
 
472
    """From the Avahi server example code"""
 
473
    global group
 
474
    
 
475
    if not group is None:
 
476
        group.Reset()
623
477
 
624
478
 
625
479
def server_state_changed(state):
626
 
    """Derived from the Avahi example code"""
 
480
    """From the Avahi server example code"""
627
481
    if state == avahi.SERVER_COLLISION:
628
 
        logger.error(u"Zeroconf server name collision")
629
 
        service.remove()
 
482
        sys.stderr.write(u"WARNING: Server name collision\n")
 
483
        remove_service()
630
484
    elif state == avahi.SERVER_RUNNING:
631
 
        service.add()
 
485
        add_service()
632
486
 
633
487
 
634
488
def entry_group_state_changed(state, error):
635
 
    """Derived from the Avahi example code"""
636
 
    logger.debug(u"Avahi state change: %i", state)
 
489
    """From the Avahi server example code"""
 
490
    global serviceName, server, rename_count
 
491
    
 
492
    if debug:
 
493
        sys.stderr.write(u"state change: %i\n" % state)
637
494
    
638
495
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
639
 
        logger.debug(u"Zeroconf service established.")
 
496
        if debug:
 
497
            sys.stderr.write(u"Service established.\n")
640
498
    elif state == avahi.ENTRY_GROUP_COLLISION:
641
 
        logger.warning(u"Zeroconf service name collision.")
642
 
        service.rename()
 
499
        
 
500
        rename_count = rename_count - 1
 
501
        if rename_count > 0:
 
502
            name = server.GetAlternativeServiceName(name)
 
503
            sys.stderr.write(u"WARNING: Service name collision, "
 
504
                             u"changing name to '%s' ...\n" % name)
 
505
            remove_service()
 
506
            add_service()
 
507
            
 
508
        else:
 
509
            sys.stderr.write(u"ERROR: No suitable service name found "
 
510
                             u"after %i retries, exiting.\n"
 
511
                             % n_rename)
 
512
            main_loop.quit()
643
513
    elif state == avahi.ENTRY_GROUP_FAILURE:
644
 
        logger.critical(u"Avahi: Error in group state changed %s",
645
 
                        unicode(error))
646
 
        raise AvahiGroupError("State changed: %s", str(error))
 
514
        sys.stderr.write(u"Error in group state changed %s\n"
 
515
                         % unicode(error))
 
516
        main_loop.quit()
 
517
        return
 
518
 
647
519
 
648
520
def if_nametoindex(interface):
649
 
    """Call the C function if_nametoindex(), or equivalent"""
650
 
    global if_nametoindex
 
521
    """Call the C function if_nametoindex()"""
651
522
    try:
652
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
653
 
            (ctypes.util.find_library("c")).if_nametoindex
 
523
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
524
        return libc.if_nametoindex(interface)
654
525
    except (OSError, AttributeError):
655
526
        if "struct" not in sys.modules:
656
527
            import struct
657
528
        if "fcntl" not in sys.modules:
658
529
            import fcntl
659
 
        def if_nametoindex(interface):
660
 
            "Get an interface index the hard way, i.e. using fcntl()"
661
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
662
 
            with closing(socket.socket()) as s:
663
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
664
 
                                    struct.pack("16s16x", interface))
665
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
666
 
            return interface_index
667
 
    return if_nametoindex(interface)
668
 
 
669
 
 
670
 
def daemon(nochdir = False, noclose = False):
671
 
    """See daemon(3).  Standard BSD Unix function.
672
 
    This should really exist as os.daemon, but it doesn't (yet)."""
673
 
    if os.fork():
674
 
        sys.exit()
675
 
    os.setsid()
676
 
    if not nochdir:
677
 
        os.chdir("/")
678
 
    if os.fork():
679
 
        sys.exit()
680
 
    if not noclose:
681
 
        # Close all standard open file descriptors
682
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
683
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
684
 
            raise OSError(errno.ENODEV,
685
 
                          "/dev/null not a character device")
686
 
        os.dup2(null, sys.stdin.fileno())
687
 
        os.dup2(null, sys.stdout.fileno())
688
 
        os.dup2(null, sys.stderr.fileno())
689
 
        if null > 2:
690
 
            os.close(null)
691
 
 
692
 
 
693
 
def main():
694
 
    parser = OptionParser(version = "%%prog %s" % version)
 
530
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
531
        s = socket.socket()
 
532
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
533
                            struct.pack("16s16x", interface))
 
534
        s.close()
 
535
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
536
        return interface_index
 
537
 
 
538
 
 
539
if __name__ == '__main__':
 
540
    parser = OptionParser()
695
541
    parser.add_option("-i", "--interface", type="string",
696
 
                      metavar="IF", help="Bind to interface IF")
697
 
    parser.add_option("-a", "--address", type="string",
698
 
                      help="Address to listen for requests on")
699
 
    parser.add_option("-p", "--port", type="int",
 
542
                      default=None, metavar="IF",
 
543
                      help="Bind to interface IF")
 
544
    parser.add_option("--cert", type="string", default="cert.pem",
 
545
                      metavar="FILE",
 
546
                      help="Public key certificate PEM file to use")
 
547
    parser.add_option("--key", type="string", default="key.pem",
 
548
                      metavar="FILE",
 
549
                      help="Private key PEM file to use")
 
550
    parser.add_option("--ca", type="string", default="ca.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Authority certificate PEM file to use")
 
553
    parser.add_option("--crl", type="string", default="crl.pem",
 
554
                      metavar="FILE",
 
555
                      help="Certificate Revokation List PEM file to use")
 
556
    parser.add_option("-p", "--port", type="int", default=None,
700
557
                      help="Port number to receive requests on")
 
558
    parser.add_option("--timeout", type="string", # Parsed later
 
559
                      default="1h",
 
560
                      help="Amount of downtime allowed for clients")
 
561
    parser.add_option("--interval", type="string", # Parsed later
 
562
                      default="5m",
 
563
                      help="How often to check that a client is up")
701
564
    parser.add_option("--check", action="store_true", default=False,
702
565
                      help="Run self-test")
703
 
    parser.add_option("--debug", action="store_true",
704
 
                      help="Debug mode; run in foreground and log to"
705
 
                      " terminal")
706
 
    parser.add_option("--priority", type="string", help="GnuTLS"
707
 
                      " priority string (see GnuTLS documentation)")
708
 
    parser.add_option("--servicename", type="string", metavar="NAME",
709
 
                      help="Zeroconf service name")
710
 
    parser.add_option("--configdir", type="string",
711
 
                      default="/etc/mandos", metavar="DIR",
712
 
                      help="Directory to search for configuration"
713
 
                      " files")
714
 
    options = parser.parse_args()[0]
 
566
    parser.add_option("--debug", action="store_true", default=False,
 
567
                      help="Debug mode")
 
568
    (options, args) = parser.parse_args()
715
569
    
716
570
    if options.check:
717
571
        import doctest
718
572
        doctest.testmod()
719
573
        sys.exit()
720
574
    
721
 
    # Default values for config file for server-global settings
722
 
    server_defaults = { "interface": "",
723
 
                        "address": "",
724
 
                        "port": "",
725
 
                        "debug": "False",
726
 
                        "priority":
727
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
728
 
                        "servicename": "Mandos",
729
 
                        }
730
 
    
731
 
    # Parse config file for server-global settings
732
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
733
 
    del server_defaults
734
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
735
 
    # Convert the SafeConfigParser object to a dict
736
 
    server_settings = server_config.defaults()
737
 
    # Use getboolean on the boolean config option
738
 
    server_settings["debug"] = server_config.getboolean\
739
 
                               ("DEFAULT", "debug")
740
 
    del server_config
741
 
    
742
 
    # Override the settings from the config file with command line
743
 
    # options, if set.
744
 
    for option in ("interface", "address", "port", "debug",
745
 
                   "priority", "servicename", "configdir"):
746
 
        value = getattr(options, option)
747
 
        if value is not None:
748
 
            server_settings[option] = value
749
 
    del options
750
 
    # Now we have our good server settings in "server_settings"
751
 
    
752
 
    debug = server_settings["debug"]
753
 
    
754
 
    if not debug:
755
 
        syslogger.setLevel(logging.WARNING)
756
 
        console.setLevel(logging.WARNING)
757
 
    
758
 
    if server_settings["servicename"] != "Mandos":
759
 
        syslogger.setFormatter(logging.Formatter\
760
 
                               ('Mandos (%s): %%(levelname)s:'
761
 
                                ' %%(message)s'
762
 
                                % server_settings["servicename"]))
763
 
    
764
 
    # Parse config file with clients
765
 
    client_defaults = { "timeout": "1h",
766
 
                        "interval": "5m",
767
 
                        "checker": "fping -q -- %(host)s",
768
 
                        "host": "",
769
 
                        }
770
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
771
 
    client_config.read(os.path.join(server_settings["configdir"],
772
 
                                    "clients.conf"))
773
 
    
774
 
    clients = Set()
775
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
776
 
                                 server_settings["port"]),
777
 
                                TCP_handler,
778
 
                                settings=server_settings,
779
 
                                clients=clients)
780
 
    pidfilename = "/var/run/mandos.pid"
781
 
    try:
782
 
        pidfile = open(pidfilename, "w")
783
 
    except IOError, error:
784
 
        logger.error("Could not open file %r", pidfilename)
785
 
    
786
 
    uid = 65534
787
 
    gid = 65534
788
 
    try:
789
 
        uid = pwd.getpwnam("mandos").pw_uid
790
 
    except KeyError:
791
 
        try:
792
 
            uid = pwd.getpwnam("nobody").pw_uid
793
 
        except KeyError:
794
 
            pass
795
 
    try:
796
 
        gid = pwd.getpwnam("mandos").pw_gid
797
 
    except KeyError:
798
 
        try:
799
 
            gid = pwd.getpwnam("nogroup").pw_gid
800
 
        except KeyError:
801
 
            pass
802
 
    try:
803
 
        os.setuid(uid)
804
 
        os.setgid(gid)
805
 
    except OSError, error:
806
 
        if error[0] != errno.EPERM:
807
 
            raise error
808
 
    
809
 
    global service
810
 
    service = AvahiService(name = server_settings["servicename"],
811
 
                           servicetype = "_mandos._tcp", )
812
 
    if server_settings["interface"]:
813
 
        service.interface = if_nametoindex\
814
 
                            (server_settings["interface"])
815
 
    
816
 
    global main_loop
817
 
    global bus
818
 
    global server
819
 
    # From the Avahi example code
 
575
    # Parse the time arguments
 
576
    try:
 
577
        options.timeout = string_to_delta(options.timeout)
 
578
    except ValueError:
 
579
        parser.error("option --timeout: Unparseable time")
 
580
    try:
 
581
        options.interval = string_to_delta(options.interval)
 
582
    except ValueError:
 
583
        parser.error("option --interval: Unparseable time")
 
584
    
 
585
    # Parse config file
 
586
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
587
    client_config = ConfigParser.SafeConfigParser(defaults)
 
588
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
589
    client_config.read("mandos-clients.conf")
 
590
    
 
591
    # From the Avahi server example code
820
592
    DBusGMainLoop(set_as_default=True )
821
593
    main_loop = gobject.MainLoop()
822
594
    bus = dbus.SystemBus()
823
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
824
 
                                           avahi.DBUS_PATH_SERVER),
825
 
                            avahi.DBUS_INTERFACE_SERVER)
 
595
    server = dbus.Interface(
 
596
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
597
            avahi.DBUS_INTERFACE_SERVER )
826
598
    # End of Avahi example code
827
599
    
 
600
    debug = options.debug
 
601
    
 
602
    clients = Set()
828
603
    def remove_from_clients(client):
829
604
        clients.remove(client)
830
605
        if not clients:
831
 
            logger.critical(u"No clients left, exiting")
832
 
            sys.exit()
 
606
            if debug:
 
607
                sys.stderr.write(u"No clients left, exiting\n")
 
608
            main_loop.quit()
833
609
    
834
 
    clients.update(Set(Client(name = section,
 
610
    clients.update(Set(Client(name=section, options=options,
835
611
                              stop_hook = remove_from_clients,
836
 
                              config
837
 
                              = dict(client_config.items(section)))
 
612
                              **(dict(client_config\
 
613
                                      .items(section))))
838
614
                       for section in client_config.sections()))
839
 
    if not clients:
840
 
        logger.critical(u"No clients defined")
841
 
        sys.exit(1)
842
 
    
843
 
    if debug:
844
 
        # Redirect stdin so all checkers get /dev/null
845
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
846
 
        os.dup2(null, sys.stdin.fileno())
847
 
        if null > 2:
848
 
            os.close(null)
849
 
    else:
850
 
        # No console logging
851
 
        logger.removeHandler(console)
852
 
        # Close all input and output, do double fork, etc.
853
 
        daemon()
854
 
    
855
 
    try:
856
 
        pid = os.getpid()
857
 
        pidfile.write(str(pid) + "\n")
858
 
        pidfile.close()
859
 
        del pidfile
860
 
    except IOError:
861
 
        logger.error(u"Could not write to file %r with PID %d",
862
 
                     pidfilename, pid)
863
 
    except NameError:
864
 
        # "pidfile" was never created
865
 
        pass
866
 
    del pidfilename
867
 
    
868
 
    def cleanup():
869
 
        "Cleanup function; run on exit"
870
 
        global group
871
 
        # From the Avahi example code
872
 
        if not group is None:
873
 
            group.Free()
874
 
            group = None
875
 
        # End of Avahi example code
876
 
        
877
 
        while clients:
878
 
            client = clients.pop()
879
 
            client.stop_hook = None
880
 
            client.stop()
881
 
    
882
 
    atexit.register(cleanup)
883
 
    
884
 
    if not debug:
885
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
886
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
887
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
888
 
    
889
615
    for client in clients:
890
616
        client.start()
891
617
    
892
 
    tcp_server.enable()
893
 
    tcp_server.server_activate()
894
 
    
895
 
    # Find out what port we got
896
 
    service.port = tcp_server.socket.getsockname()[1]
897
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
898
 
                u" scope_id %d" % tcp_server.socket.getsockname())
899
 
    
900
 
    #service.interface = tcp_server.socket.getsockname()[3]
901
 
    
 
618
    tcp_server = IPv6_TCPServer((None, options.port),
 
619
                                tcp_handler,
 
620
                                options=options,
 
621
                                clients=clients)
 
622
    # Find out what random port we got
 
623
    servicePort = tcp_server.socket.getsockname()[1]
 
624
    if debug:
 
625
        sys.stderr.write(u"Now listening on port %d\n" % servicePort)
 
626
    
 
627
    if options.interface is not None:
 
628
        serviceInterface = if_nametoindex(options.interface)
 
629
    
 
630
    # From the Avahi server example code
 
631
    server.connect_to_signal("StateChanged", server_state_changed)
 
632
    server_state_changed(server.GetState())
 
633
    # End of Avahi example code
 
634
    
 
635
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
636
                         lambda *args, **kwargs:
 
637
                         tcp_server.handle_request(*args[2:],
 
638
                                                   **kwargs) or True)
902
639
    try:
903
 
        # From the Avahi example code
904
 
        server.connect_to_signal("StateChanged", server_state_changed)
905
 
        try:
906
 
            server_state_changed(server.GetState())
907
 
        except dbus.exceptions.DBusException, error:
908
 
            logger.critical(u"DBusException: %s", error)
909
 
            sys.exit(1)
910
 
        # End of Avahi example code
911
 
        
912
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
913
 
                             lambda *args, **kwargs:
914
 
                             tcp_server.handle_request\
915
 
                             (*args[2:], **kwargs) or True)
916
 
        
917
 
        logger.debug(u"Starting main loop")
918
640
        main_loop.run()
919
 
    except AvahiError, error:
920
 
        logger.critical(u"AvahiError: %s" + unicode(error))
921
 
        sys.exit(1)
922
641
    except KeyboardInterrupt:
923
 
        if debug:
924
 
            print
 
642
        print
 
643
    
 
644
    # Cleanup here
925
645
 
926
 
if __name__ == '__main__':
927
 
    main()
 
646
    # From the Avahi server example code
 
647
    if not group is None:
 
648
        group.Free()
 
649
    # End of Avahi example code
 
650
    
 
651
    for client in clients:
 
652
        client.stop_hook = None
 
653
        client.stop()