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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
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
24
 
59
25
import dbus
60
26
import gobject
61
27
import avahi
62
28
from dbus.mainloop.glib import DBusGMainLoop
63
29
import ctypes
64
 
import ctypes.util
65
 
 
66
 
version = "1.0"
67
 
 
68
 
logger = logging.Logger('mandos')
69
 
syslogger = logging.handlers.SysLogHandler\
70
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
 
             address = "/dev/log")
72
 
syslogger.setFormatter(logging.Formatter\
73
 
                        ('Mandos: %(levelname)s: %(message)s'))
74
 
logger.addHandler(syslogger)
75
 
 
76
 
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
 
                                       ' %(message)s'))
79
 
logger.addHandler(console)
80
 
 
81
 
class AvahiError(Exception):
82
 
    def __init__(self, value):
83
 
        self.value = value
84
 
        super(AvahiError, self).__init__()
85
 
    def __str__(self):
86
 
        return repr(self.value)
87
 
 
88
 
class AvahiServiceError(AvahiError):
89
 
    pass
90
 
 
91
 
class AvahiGroupError(AvahiError):
92
 
    pass
93
 
 
94
 
 
95
 
class AvahiService(object):
96
 
    """An Avahi (Zeroconf) service.
97
 
    Attributes:
98
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
99
 
               Used to optionally bind to the specified interface.
100
 
    name: string; Example: 'Mandos'
101
 
    type: string; Example: '_mandos._tcp'.
102
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
103
 
    port: integer; what port to announce
104
 
    TXT: list of strings; TXT record for the service
105
 
    domain: string; Domain to publish on, default to .local if empty.
106
 
    host: string; Host to publish records for, default is localhost
107
 
    max_renames: integer; maximum number of renames
108
 
    rename_count: integer; counter so we only rename after collisions
109
 
                  a sensible number of times
110
 
    """
111
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
112
 
                 servicetype = None, port = None, TXT = None, domain = "",
113
 
                 host = "", max_renames = 32768):
114
 
        self.interface = interface
115
 
        self.name = name
116
 
        self.type = servicetype
117
 
        self.port = port
118
 
        if TXT is None:
119
 
            self.TXT = []
120
 
        else:
121
 
            self.TXT = TXT
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\
151
 
                    (bus.get_object(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
 
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
170
45
# End of Avahi example code
171
46
 
172
47
 
177
52
    fingerprint: string (40 or 32 hexadecimal digits); used to
178
53
                 uniquely identify the client
179
54
    secret:    bytestring; sent verbatim (over TLS) to client
180
 
    host:      string; available for use by the checker command
181
 
    created:   datetime.datetime(); object creation, not client host
182
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
183
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
184
 
                                     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
185
60
    interval:  datetime.timedelta(); How often to start a new checker
186
61
    stop_hook: If set, called by stop() as stop_hook(self)
187
62
    checker:   subprocess.Popen(); a running checker process used
188
63
                                   to see if the client lives.
189
 
                                   'None' if no process is running.
 
64
                                   Is None if no process is running.
190
65
    checker_initiator_tag: a gobject event source tag, or None
191
66
    stop_initiator_tag:    - '' -
192
67
    checker_callback_tag:  - '' -
193
68
    checker_command: string; External command which is run to check if
194
 
                     client lives.  %() expansions are done at
 
69
                     client lives.  %()s expansions are done at
195
70
                     runtime with vars(self) as dict, so that for
196
71
                     instance %(name)s can be used in the command.
197
72
    Private attibutes:
198
73
    _timeout: Real variable for 'timeout'
199
74
    _interval: Real variable for 'interval'
200
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
75
    _timeout_milliseconds: Used by gobject.timeout_add()
201
76
    _interval_milliseconds: - '' -
202
77
    """
203
78
    def _set_timeout(self, timeout):
223
98
    interval = property(lambda self: self._interval,
224
99
                        _set_interval)
225
100
    del _set_interval
226
 
    def __init__(self, name = None, stop_hook=None, config=None):
227
 
        """Note: the 'checker' key in 'config' sets the
228
 
        'checker_command' attribute and *not* the 'checker'
229
 
        attribute."""
230
 
        if config is None:
231
 
            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):
232
104
        self.name = name
233
 
        logger.debug(u"Creating client %r", self.name)
234
 
        # Uppercase and remove spaces from fingerprint for later
235
 
        # comparison purposes with return value from the fingerprint()
236
 
        # function
237
 
        self.fingerprint = config["fingerprint"].upper()\
238
 
                           .replace(u" ", u"")
239
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
240
 
        if "secret" in config:
241
 
            self.secret = config["secret"].decode(u"base64")
242
 
        elif "secfile" in config:
243
 
            secfile = open(os.path.expanduser(os.path.expandvars
244
 
                                              (config["secfile"])))
245
 
            self.secret = secfile.read()
246
 
            secfile.close()
 
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()
247
115
        else:
248
 
            raise TypeError(u"No secret or secfile for client %s"
249
 
                            % self.name)
250
 
        self.host = config.get("host", "")
 
116
            raise RuntimeError(u"No secret or secfile for client %s"
 
117
                               % self.name)
 
118
        self.fqdn = fqdn                # string
251
119
        self.created = datetime.datetime.now()
252
 
        self.last_checked_ok = None
253
 
        self.timeout = string_to_delta(config["timeout"])
254
 
        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
255
129
        self.stop_hook = stop_hook
256
130
        self.checker = None
257
131
        self.checker_initiator_tag = None
258
132
        self.stop_initiator_tag = None
259
133
        self.checker_callback_tag = None
260
 
        self.check_command = config["checker"]
 
134
        self.check_command = checker
261
135
    def start(self):
262
 
        """Start this client's checker and timeout hooks"""
 
136
        """Start this clients checker and timeout hooks"""
263
137
        # Schedule a new checker to be started an 'interval' from now,
264
138
        # and every interval from then on.
265
139
        self.checker_initiator_tag = gobject.timeout_add\
273
147
                                   self.stop)
274
148
    def stop(self):
275
149
        """Stop this client.
276
 
        The possibility that a client might be restarted is left open,
277
 
        but not currently used."""
278
 
        # If this client doesn't have a secret, it is already stopped.
279
 
        if hasattr(self, "secret") and self.secret:
280
 
            logger.info(u"Stopping client %s", self.name)
281
 
            self.secret = None
282
 
        else:
283
 
            return False
284
 
        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:
285
156
            gobject.source_remove(self.stop_initiator_tag)
286
157
            self.stop_initiator_tag = None
287
 
        if getattr(self, "checker_initiator_tag", False):
 
158
        if self.checker_initiator_tag:
288
159
            gobject.source_remove(self.checker_initiator_tag)
289
160
            self.checker_initiator_tag = None
290
161
        self.stop_checker()
293
164
        # Do not run this again if called by a gobject.timeout_add
294
165
        return False
295
166
    def __del__(self):
296
 
        self.stop_hook = None
297
 
        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()
298
177
    def checker_callback(self, pid, condition):
299
178
        """The checker has completed, so take appropriate actions."""
300
179
        now = datetime.datetime.now()
301
 
        self.checker_callback_tag = None
302
 
        self.checker = None
303
180
        if os.WIFEXITED(condition) \
304
181
               and (os.WEXITSTATUS(condition) == 0):
305
 
            logger.info(u"Checker for %(name)s succeeded",
306
 
                        vars(self))
307
 
            self.last_checked_ok = now
 
182
            if debug:
 
183
                sys.stderr.write(u"Checker for %(name)s succeeded\n"
 
184
                                 % vars(self))
 
185
            self.last_seen = now
308
186
            gobject.source_remove(self.stop_initiator_tag)
309
187
            self.stop_initiator_tag = gobject.timeout_add\
310
188
                                      (self._timeout_milliseconds,
311
189
                                       self.stop)
312
 
        elif not os.WIFEXITED(condition):
313
 
            logger.warning(u"Checker for %(name)s crashed?",
314
 
                           vars(self))
315
 
        else:
316
 
            logger.info(u"Checker for %(name)s failed",
317
 
                        vars(self))
 
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
318
199
    def start_checker(self):
319
200
        """Start a new checker subprocess if one is not running.
320
201
        If a checker already exists, leave it running and do
321
202
        nothing."""
322
 
        # The reason for not killing a running checker is that if we
323
 
        # did that, then if a checker (for some reason) started
324
 
        # running slowly and taking more than 'interval' time, the
325
 
        # client would inevitably timeout, since no checker would get
326
 
        # a chance to run to completion.  If we instead leave running
327
 
        # checkers alone, the checker would have to take more time
328
 
        # than 'timeout' for the client to be declared invalid, which
329
 
        # is as it should be.
330
203
        if self.checker is None:
 
204
            if debug:
 
205
                sys.stderr.write(u"Starting checker for %s\n"
 
206
                                 % self.name)
331
207
            try:
332
 
                # In case check_command has exactly one % operator
333
 
                command = self.check_command % self.host
 
208
                command = self.check_command % self.fqdn
334
209
            except TypeError:
335
 
                # Escape attributes for the shell
336
210
                escaped_attrs = dict((key, re.escape(str(val)))
337
211
                                     for key, val in
338
212
                                     vars(self).iteritems())
339
 
                try:
340
 
                    command = self.check_command % escaped_attrs
341
 
                except TypeError, error:
342
 
                    logger.error(u'Could not format string "%s":'
343
 
                                 u' %s', self.check_command, error)
344
 
                    return True # Try again later
 
213
                command = self.check_command % escaped_attrs
345
214
            try:
346
 
                logger.info(u"Starting checker %r for %s",
347
 
                            command, self.name)
348
 
                # We don't need to redirect stdout and stderr, since
349
 
                # in normal mode, that is already done by daemon(),
350
 
                # and in debug mode we don't want to.  (Stdin is
351
 
                # always replaced by /dev/null.)
352
 
                self.checker = subprocess.Popen(command,
353
 
                                                close_fds=True,
354
 
                                                shell=True, cwd="/")
355
 
                self.checker_callback_tag = gobject.child_watch_add\
356
 
                                            (self.checker.pid,
357
 
                                             self.checker_callback)
358
 
            except OSError, error:
359
 
                logger.error(u"Failed to start subprocess: %s",
360
 
                             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)
361
227
        # Re-run this periodically if run by gobject.timeout_add
362
228
        return True
363
229
    def stop_checker(self):
364
230
        """Force the checker process, if any, to stop."""
365
 
        if self.checker_callback_tag:
366
 
            gobject.source_remove(self.checker_callback_tag)
367
 
            self.checker_callback_tag = None
368
 
        if getattr(self, "checker", None) is None:
 
231
        if not hasattr(self, "checker") or self.checker is None:
369
232
            return
370
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
371
 
        try:
372
 
            os.kill(self.checker.pid, signal.SIGTERM)
373
 
            #os.sleep(0.5)
374
 
            #if self.checker.poll() is None:
375
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
376
 
        except OSError, error:
377
 
            if error.errno != errno.ESRCH: # No such process
378
 
                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)
379
238
        self.checker = None
380
 
    def still_valid(self):
 
239
    def still_valid(self, now=None):
381
240
        """Has the timeout not yet passed for this client?"""
382
 
        now = datetime.datetime.now()
383
 
        if self.last_checked_ok is None:
 
241
        if now is None:
 
242
            now = datetime.datetime.now()
 
243
        if self.last_seen is None:
384
244
            return now < (self.created + self.timeout)
385
245
        else:
386
 
            return now < (self.last_checked_ok + self.timeout)
 
246
            return now < (self.last_seen + self.timeout)
387
247
 
388
248
 
389
249
def peer_certificate(session):
390
 
    "Return the peer's OpenPGP certificate as a bytestring"
391
250
    # If not an OpenPGP certificate...
392
251
    if gnutls.library.functions.gnutls_certificate_type_get\
393
252
            (session._c_object) \
404
263
 
405
264
 
406
265
def fingerprint(openpgp):
407
 
    "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))
408
270
    # New GnuTLS "datum" with the OpenPGP public key
409
271
    datum = gnutls.library.types.gnutls_datum_t\
410
272
        (ctypes.cast(ctypes.c_char_p(openpgp),
411
273
                     ctypes.POINTER(ctypes.c_ubyte)),
412
274
         ctypes.c_uint(len(openpgp)))
413
 
    # New empty GnuTLS certificate
414
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
415
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
416
 
        (ctypes.byref(crt))
417
275
    # Import the OpenPGP public key into the certificate
418
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
419
 
                    (crt, ctypes.byref(datum),
420
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
421
 
    # Verify the self signature in the key
422
 
    crtverify = ctypes.c_uint()
423
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
424
 
        (crt, 0, ctypes.byref(crtverify))
425
 
    if crtverify.value != 0:
426
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
427
 
        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)
428
280
    # New buffer for the fingerprint
429
 
    buf = ctypes.create_string_buffer(20)
430
 
    buf_len = ctypes.c_size_t()
 
281
    buffer = ctypes.create_string_buffer(20)
 
282
    buffer_length = ctypes.c_size_t()
431
283
    # Get the fingerprint from the certificate into the buffer
432
284
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
433
 
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
 
285
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
434
286
    # Deinit the certificate
435
287
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
436
288
    # Convert the buffer to a Python bytestring
437
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
289
    fpr = ctypes.string_at(buffer, buffer_length.value)
438
290
    # Convert the bytestring to hexadecimal notation
439
291
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
440
292
    return hex_fpr
441
293
 
442
294
 
443
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
295
class tcp_handler(SocketServer.BaseRequestHandler, object):
444
296
    """A TCP request handler class.
445
297
    Instantiated by IPv6_TCPServer for each request to handle it.
446
298
    Note: This will run in its own forked process."""
447
299
    
448
300
    def handle(self):
449
 
        logger.info(u"TCP connection from: %s",
450
 
                     unicode(self.client_address))
451
 
        session = gnutls.connection.ClientSession\
452
 
                  (self.request, gnutls.connection.X509Credentials())
453
 
        
454
 
        line = self.request.makefile().readline()
455
 
        logger.debug(u"Protocol version: %r", line)
456
 
        try:
457
 
            if int(line.strip().split()[0]) > 1:
458
 
                raise RuntimeError
459
 
        except (ValueError, IndexError, RuntimeError), error:
460
 
            logger.error(u"Unknown protocol version: %s", error)
461
 
            return
462
 
        
463
 
        # Note: gnutls.connection.X509Credentials is really a generic
464
 
        # GnuTLS certificate credentials object so long as no X.509
465
 
        # keys are added to it.  Therefore, we can use it here despite
466
 
        # 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())
467
310
        
468
311
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
469
312
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
470
313
        #                "+DHE-DSS"))
471
 
        priority = "NORMAL"             # Fallback default, since this
472
 
                                        # MUST be set.
473
 
        if self.server.settings["priority"]:
474
 
            priority = self.server.settings["priority"]
 
314
        priority = "SECURE256"
 
315
        
475
316
        gnutls.library.functions.gnutls_priority_set_direct\
476
 
            (session._c_object, priority, None)
 
317
            (session._c_object, priority, None);
477
318
        
478
319
        try:
479
320
            session.handshake()
480
321
        except gnutls.errors.GNUTLSError, error:
481
 
            logger.warning(u"Handshake failed: %s", error)
 
322
            if debug:
 
323
                sys.stderr.write(u"Handshake failed: %s\n" % error)
482
324
            # Do not run session.bye() here: the session is not
483
325
            # established.  Just abandon the request.
484
326
            return
485
327
        try:
486
328
            fpr = fingerprint(peer_certificate(session))
487
329
        except (TypeError, gnutls.errors.GNUTLSError), error:
488
 
            logger.warning(u"Bad certificate: %s", error)
 
330
            if debug:
 
331
                sys.stderr.write(u"Bad certificate: %s\n" % error)
489
332
            session.bye()
490
333
            return
491
 
        logger.debug(u"Fingerprint: %s", fpr)
 
334
        if debug:
 
335
            sys.stderr.write(u"Fingerprint: %s\n" % fpr)
492
336
        client = None
493
 
        for c in self.server.clients:
 
337
        for c in clients:
494
338
            if c.fingerprint == fpr:
495
339
                client = c
496
340
                break
497
 
        if not client:
498
 
            logger.warning(u"Client not found for fingerprint: %s",
499
 
                           fpr)
500
 
            session.bye()
501
 
            return
502
341
        # Have to check if client.still_valid(), since it is possible
503
342
        # that the client timed out while establishing the GnuTLS
504
343
        # session.
505
 
        if not client.still_valid():
506
 
            logger.warning(u"Client %(name)s is invalid",
507
 
                           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)
508
352
            session.bye()
509
353
            return
510
354
        sent_size = 0
511
355
        while sent_size < len(client.secret):
512
356
            sent = session.send(client.secret[sent_size:])
513
 
            logger.debug(u"Sent: %d, remaining: %d",
514
 
                         sent, len(client.secret)
515
 
                         - (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)))
516
361
            sent_size += sent
517
362
        session.bye()
518
363
 
520
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
521
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
522
367
    Attributes:
523
 
        settings:       Server settings
 
368
        options:        Command line options
524
369
        clients:        Set() of Client objects
525
 
        enabled:        Boolean; whether this server is activated yet
526
370
    """
527
371
    address_family = socket.AF_INET6
528
372
    def __init__(self, *args, **kwargs):
529
 
        if "settings" in kwargs:
530
 
            self.settings = kwargs["settings"]
531
 
            del kwargs["settings"]
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
532
376
        if "clients" in kwargs:
533
377
            self.clients = kwargs["clients"]
534
378
            del kwargs["clients"]
535
 
        self.enabled = False
536
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
379
        return super(type(self), self).__init__(*args, **kwargs)
537
380
    def server_bind(self):
538
381
        """This overrides the normal server_bind() function
539
382
        to bind to an interface if one was specified, and also NOT to
540
383
        bind to an address or port if they were not specified."""
541
 
        if self.settings["interface"]:
542
 
            # 25 is from /usr/include/asm-i486/socket.h
543
 
            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
544
388
            try:
545
389
                self.socket.setsockopt(socket.SOL_SOCKET,
546
 
                                       SO_BINDTODEVICE,
547
 
                                       self.settings["interface"])
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
548
392
            except socket.error, error:
549
393
                if error[0] == errno.EPERM:
550
 
                    logger.error(u"No permission to"
551
 
                                 u" bind to interface %s",
552
 
                                 self.settings["interface"])
 
394
                    sys.stderr.write(u"Warning: No permission to" \
 
395
                                     u" bind to interface %s\n"
 
396
                                     % self.options.interface)
553
397
                else:
554
398
                    raise error
555
399
        # Only bind(2) the socket if we really need to.
558
402
                in6addr_any = "::"
559
403
                self.server_address = (in6addr_any,
560
404
                                       self.server_address[1])
561
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
562
406
                self.server_address = (self.server_address[0],
563
407
                                       0)
564
 
#                 if self.settings["interface"]:
565
 
#                     self.server_address = (self.server_address[0],
566
 
#                                            0, # port
567
 
#                                            0, # flowinfo
568
 
#                                            if_nametoindex
569
 
#                                            (self.settings
570
 
#                                             ["interface"]))
571
 
            return super(IPv6_TCPServer, self).server_bind()
572
 
    def server_activate(self):
573
 
        if self.enabled:
574
 
            return super(IPv6_TCPServer, self).server_activate()
575
 
    def enable(self):
576
 
        self.enabled = True
 
408
            return super(type(self), self).server_bind()
577
409
 
578
410
 
579
411
def string_to_delta(interval):
589
421
    datetime.timedelta(1)
590
422
    >>> string_to_delta(u'1w')
591
423
    datetime.timedelta(7)
592
 
    >>> string_to_delta('5m 30s')
593
 
    datetime.timedelta(0, 330)
594
424
    """
595
 
    timevalue = datetime.timedelta(0)
596
 
    for s in interval.split():
597
 
        try:
598
 
            suffix = unicode(s[-1])
599
 
            value = int(s[:-1])
600
 
            if suffix == u"d":
601
 
                delta = datetime.timedelta(value)
602
 
            elif suffix == u"s":
603
 
                delta = datetime.timedelta(0, value)
604
 
            elif suffix == u"m":
605
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
606
 
            elif suffix == u"h":
607
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
608
 
            elif suffix == u"w":
609
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
610
 
            else:
611
 
                raise ValueError
612
 
        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:
613
439
            raise ValueError
614
 
        timevalue += delta
615
 
    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()
616
477
 
617
478
 
618
479
def server_state_changed(state):
619
 
    """Derived from the Avahi example code"""
 
480
    """From the Avahi server example code"""
620
481
    if state == avahi.SERVER_COLLISION:
621
 
        logger.error(u"Zeroconf server name collision")
622
 
        service.remove()
 
482
        sys.stderr.write(u"WARNING: Server name collision\n")
 
483
        remove_service()
623
484
    elif state == avahi.SERVER_RUNNING:
624
 
        service.add()
 
485
        add_service()
625
486
 
626
487
 
627
488
def entry_group_state_changed(state, error):
628
 
    """Derived from the Avahi example code"""
629
 
    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)
630
494
    
631
495
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
632
 
        logger.debug(u"Zeroconf service established.")
 
496
        if debug:
 
497
            sys.stderr.write(u"Service established.\n")
633
498
    elif state == avahi.ENTRY_GROUP_COLLISION:
634
 
        logger.warning(u"Zeroconf service name collision.")
635
 
        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()
636
513
    elif state == avahi.ENTRY_GROUP_FAILURE:
637
 
        logger.critical(u"Avahi: Error in group state changed %s",
638
 
                        unicode(error))
639
 
        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
 
640
519
 
641
520
def if_nametoindex(interface):
642
 
    """Call the C function if_nametoindex(), or equivalent"""
643
 
    global if_nametoindex
 
521
    """Call the C function if_nametoindex()"""
644
522
    try:
645
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
646
 
            (ctypes.util.find_library("c")).if_nametoindex
 
523
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
524
        return libc.if_nametoindex(interface)
647
525
    except (OSError, AttributeError):
648
526
        if "struct" not in sys.modules:
649
527
            import struct
650
528
        if "fcntl" not in sys.modules:
651
529
            import fcntl
652
 
        def if_nametoindex(interface):
653
 
            "Get an interface index the hard way, i.e. using fcntl()"
654
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
655
 
            s = socket.socket()
656
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
657
 
                                struct.pack("16s16x", interface))
658
 
            s.close()
659
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
660
 
            return interface_index
661
 
    return if_nametoindex(interface)
662
 
 
663
 
 
664
 
def daemon(nochdir = False, noclose = False):
665
 
    """See daemon(3).  Standard BSD Unix function.
666
 
    This should really exist as os.daemon, but it doesn't (yet)."""
667
 
    if os.fork():
668
 
        sys.exit()
669
 
    os.setsid()
670
 
    if not nochdir:
671
 
        os.chdir("/")
672
 
    if os.fork():
673
 
        sys.exit()
674
 
    if not noclose:
675
 
        # Close all standard open file descriptors
676
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
677
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
678
 
            raise OSError(errno.ENODEV,
679
 
                          "/dev/null not a character device")
680
 
        os.dup2(null, sys.stdin.fileno())
681
 
        os.dup2(null, sys.stdout.fileno())
682
 
        os.dup2(null, sys.stderr.fileno())
683
 
        if null > 2:
684
 
            os.close(null)
685
 
 
686
 
 
687
 
def main():
688
 
    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()
689
541
    parser.add_option("-i", "--interface", type="string",
690
 
                      metavar="IF", help="Bind to interface IF")
691
 
    parser.add_option("-a", "--address", type="string",
692
 
                      help="Address to listen for requests on")
693
 
    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,
694
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")
695
564
    parser.add_option("--check", action="store_true", default=False,
696
565
                      help="Run self-test")
697
 
    parser.add_option("--debug", action="store_true",
698
 
                      help="Debug mode; run in foreground and log to"
699
 
                      " terminal")
700
 
    parser.add_option("--priority", type="string", help="GnuTLS"
701
 
                      " priority string (see GnuTLS documentation)")
702
 
    parser.add_option("--servicename", type="string", metavar="NAME",
703
 
                      help="Zeroconf service name")
704
 
    parser.add_option("--configdir", type="string",
705
 
                      default="/etc/mandos", metavar="DIR",
706
 
                      help="Directory to search for configuration"
707
 
                      " files")
708
 
    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()
709
569
    
710
570
    if options.check:
711
571
        import doctest
712
572
        doctest.testmod()
713
573
        sys.exit()
714
574
    
715
 
    # Default values for config file for server-global settings
716
 
    server_defaults = { "interface": "",
717
 
                        "address": "",
718
 
                        "port": "",
719
 
                        "debug": "False",
720
 
                        "priority":
721
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
722
 
                        "servicename": "Mandos",
723
 
                        }
724
 
    
725
 
    # Parse config file for server-global settings
726
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
727
 
    del server_defaults
728
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
729
 
    # Convert the SafeConfigParser object to a dict
730
 
    server_settings = server_config.defaults()
731
 
    # Use getboolean on the boolean config option
732
 
    server_settings["debug"] = server_config.getboolean\
733
 
                               ("DEFAULT", "debug")
734
 
    del server_config
735
 
    
736
 
    # Override the settings from the config file with command line
737
 
    # options, if set.
738
 
    for option in ("interface", "address", "port", "debug",
739
 
                   "priority", "servicename", "configdir"):
740
 
        value = getattr(options, option)
741
 
        if value is not None:
742
 
            server_settings[option] = value
743
 
    del options
744
 
    # Now we have our good server settings in "server_settings"
745
 
    
746
 
    debug = server_settings["debug"]
747
 
    
748
 
    if not debug:
749
 
        syslogger.setLevel(logging.WARNING)
750
 
        console.setLevel(logging.WARNING)
751
 
    
752
 
    if server_settings["servicename"] != "Mandos":
753
 
        syslogger.setFormatter(logging.Formatter\
754
 
                               ('Mandos (%s): %%(levelname)s:'
755
 
                                ' %%(message)s'
756
 
                                % server_settings["servicename"]))
757
 
    
758
 
    # Parse config file with clients
759
 
    client_defaults = { "timeout": "1h",
760
 
                        "interval": "5m",
761
 
                        "checker": "fping -q -- %(host)s",
762
 
                        "host": "",
763
 
                        }
764
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
765
 
    client_config.read(os.path.join(server_settings["configdir"],
766
 
                                    "clients.conf"))
767
 
    
768
 
    clients = Set()
769
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
770
 
                                 server_settings["port"]),
771
 
                                TCP_handler,
772
 
                                settings=server_settings,
773
 
                                clients=clients)
774
 
    pidfilename = "/var/run/mandos.pid"
775
 
    try:
776
 
        pidfile = open(pidfilename, "w")
777
 
    except IOError, error:
778
 
        logger.error("Could not open file %r", pidfilename)
779
 
    
780
 
    uid = 65534
781
 
    gid = 65534
782
 
    try:
783
 
        uid = pwd.getpwnam("mandos").pw_uid
784
 
    except KeyError:
785
 
        try:
786
 
            uid = pwd.getpwnam("nobody").pw_uid
787
 
        except KeyError:
788
 
            pass
789
 
    try:
790
 
        gid = pwd.getpwnam("mandos").pw_gid
791
 
    except KeyError:
792
 
        try:
793
 
            gid = pwd.getpwnam("nogroup").pw_gid
794
 
        except KeyError:
795
 
            pass
796
 
    try:
797
 
        os.setuid(uid)
798
 
        os.setgid(gid)
799
 
    except OSError, error:
800
 
        if error[0] != errno.EPERM:
801
 
            raise error
802
 
    
803
 
    global service
804
 
    service = AvahiService(name = server_settings["servicename"],
805
 
                           servicetype = "_mandos._tcp", )
806
 
    if server_settings["interface"]:
807
 
        service.interface = if_nametoindex\
808
 
                            (server_settings["interface"])
809
 
    
810
 
    global main_loop
811
 
    global bus
812
 
    global server
813
 
    # 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
814
592
    DBusGMainLoop(set_as_default=True )
815
593
    main_loop = gobject.MainLoop()
816
594
    bus = dbus.SystemBus()
817
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
818
 
                                           avahi.DBUS_PATH_SERVER),
819
 
                            avahi.DBUS_INTERFACE_SERVER)
 
595
    server = dbus.Interface(
 
596
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
597
            avahi.DBUS_INTERFACE_SERVER )
820
598
    # End of Avahi example code
821
599
    
 
600
    debug = options.debug
 
601
    
 
602
    clients = Set()
822
603
    def remove_from_clients(client):
823
604
        clients.remove(client)
824
605
        if not clients:
825
 
            logger.critical(u"No clients left, exiting")
826
 
            sys.exit()
 
606
            if debug:
 
607
                sys.stderr.write(u"No clients left, exiting\n")
 
608
            main_loop.quit()
827
609
    
828
 
    clients.update(Set(Client(name = section,
 
610
    clients.update(Set(Client(name=section, options=options,
829
611
                              stop_hook = remove_from_clients,
830
 
                              config
831
 
                              = dict(client_config.items(section)))
 
612
                              **(dict(client_config\
 
613
                                      .items(section))))
832
614
                       for section in client_config.sections()))
833
 
    if not clients:
834
 
        logger.critical(u"No clients defined")
835
 
        sys.exit(1)
836
 
    
837
 
    if debug:
838
 
        # Redirect stdin so all checkers get /dev/null
839
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
840
 
        os.dup2(null, sys.stdin.fileno())
841
 
        if null > 2:
842
 
            os.close(null)
843
 
    else:
844
 
        # No console logging
845
 
        logger.removeHandler(console)
846
 
        # Close all input and output, do double fork, etc.
847
 
        daemon()
848
 
    
849
 
    try:
850
 
        pid = os.getpid()
851
 
        pidfile.write(str(pid) + "\n")
852
 
        pidfile.close()
853
 
        del pidfile
854
 
    except IOError:
855
 
        logger.error(u"Could not write to file %r with PID %d",
856
 
                     pidfilename, pid)
857
 
    except NameError:
858
 
        # "pidfile" was never created
859
 
        pass
860
 
    del pidfilename
861
 
    
862
 
    def cleanup():
863
 
        "Cleanup function; run on exit"
864
 
        global group
865
 
        # From the Avahi example code
866
 
        if not group is None:
867
 
            group.Free()
868
 
            group = None
869
 
        # End of Avahi example code
870
 
        
871
 
        while clients:
872
 
            client = clients.pop()
873
 
            client.stop_hook = None
874
 
            client.stop()
875
 
    
876
 
    atexit.register(cleanup)
877
 
    
878
 
    if not debug:
879
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
880
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
881
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
882
 
    
883
615
    for client in clients:
884
616
        client.start()
885
617
    
886
 
    tcp_server.enable()
887
 
    tcp_server.server_activate()
888
 
    
889
 
    # Find out what port we got
890
 
    service.port = tcp_server.socket.getsockname()[1]
891
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
892
 
                u" scope_id %d" % tcp_server.socket.getsockname())
893
 
    
894
 
    #service.interface = tcp_server.socket.getsockname()[3]
895
 
    
 
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)
896
639
    try:
897
 
        # From the Avahi example code
898
 
        server.connect_to_signal("StateChanged", server_state_changed)
899
 
        try:
900
 
            server_state_changed(server.GetState())
901
 
        except dbus.exceptions.DBusException, error:
902
 
            logger.critical(u"DBusException: %s", error)
903
 
            sys.exit(1)
904
 
        # End of Avahi example code
905
 
        
906
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
907
 
                             lambda *args, **kwargs:
908
 
                             tcp_server.handle_request\
909
 
                             (*args[2:], **kwargs) or True)
910
 
        
911
 
        logger.debug(u"Starting main loop")
912
640
        main_loop.run()
913
 
    except AvahiError, error:
914
 
        logger.critical(u"AvahiError: %s" + unicode(error))
915
 
        sys.exit(1)
916
641
    except KeyboardInterrupt:
917
 
        if debug:
918
 
            print
 
642
        print
 
643
    
 
644
    # Cleanup here
919
645
 
920
 
if __name__ == '__main__':
921
 
    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()