/mandos/trunk

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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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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(config["secfile"])
244
 
            self.secret = secfile.read()
245
 
            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()
246
115
        else:
247
 
            raise TypeError(u"No secret or secfile for client %s"
248
 
                            % self.name)
249
 
        self.host = config.get("host", "")
 
116
            raise RuntimeError(u"No secret or secfile for client %s"
 
117
                               % self.name)
 
118
        self.fqdn = fqdn                # string
250
119
        self.created = datetime.datetime.now()
251
 
        self.last_checked_ok = None
252
 
        self.timeout = string_to_delta(config["timeout"])
253
 
        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
254
129
        self.stop_hook = stop_hook
255
130
        self.checker = None
256
131
        self.checker_initiator_tag = None
257
132
        self.stop_initiator_tag = None
258
133
        self.checker_callback_tag = None
259
 
        self.check_command = config["checker"]
 
134
        self.check_command = checker
260
135
    def start(self):
261
 
        """Start this client's checker and timeout hooks"""
 
136
        """Start this clients checker and timeout hooks"""
262
137
        # Schedule a new checker to be started an 'interval' from now,
263
138
        # and every interval from then on.
264
139
        self.checker_initiator_tag = gobject.timeout_add\
272
147
                                   self.stop)
273
148
    def stop(self):
274
149
        """Stop this client.
275
 
        The possibility that a client might be restarted is left open,
276
 
        but not currently used."""
277
 
        # If this client doesn't have a secret, it is already stopped.
278
 
        if hasattr(self, "secret") and self.secret:
279
 
            logger.info(u"Stopping client %s", self.name)
280
 
            self.secret = None
281
 
        else:
282
 
            return False
283
 
        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:
284
156
            gobject.source_remove(self.stop_initiator_tag)
285
157
            self.stop_initiator_tag = None
286
 
        if getattr(self, "checker_initiator_tag", False):
 
158
        if self.checker_initiator_tag:
287
159
            gobject.source_remove(self.checker_initiator_tag)
288
160
            self.checker_initiator_tag = None
289
161
        self.stop_checker()
292
164
        # Do not run this again if called by a gobject.timeout_add
293
165
        return False
294
166
    def __del__(self):
295
 
        self.stop_hook = None
296
 
        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()
297
177
    def checker_callback(self, pid, condition):
298
178
        """The checker has completed, so take appropriate actions."""
299
179
        now = datetime.datetime.now()
300
 
        self.checker_callback_tag = None
301
 
        self.checker = None
302
180
        if os.WIFEXITED(condition) \
303
181
               and (os.WEXITSTATUS(condition) == 0):
304
 
            logger.info(u"Checker for %(name)s succeeded",
305
 
                        vars(self))
306
 
            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
307
186
            gobject.source_remove(self.stop_initiator_tag)
308
187
            self.stop_initiator_tag = gobject.timeout_add\
309
188
                                      (self._timeout_milliseconds,
310
189
                                       self.stop)
311
 
        elif not os.WIFEXITED(condition):
312
 
            logger.warning(u"Checker for %(name)s crashed?",
313
 
                           vars(self))
314
 
        else:
315
 
            logger.info(u"Checker for %(name)s failed",
316
 
                        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
317
199
    def start_checker(self):
318
200
        """Start a new checker subprocess if one is not running.
319
201
        If a checker already exists, leave it running and do
320
202
        nothing."""
321
 
        # The reason for not killing a running checker is that if we
322
 
        # did that, then if a checker (for some reason) started
323
 
        # running slowly and taking more than 'interval' time, the
324
 
        # client would inevitably timeout, since no checker would get
325
 
        # a chance to run to completion.  If we instead leave running
326
 
        # checkers alone, the checker would have to take more time
327
 
        # than 'timeout' for the client to be declared invalid, which
328
 
        # is as it should be.
329
203
        if self.checker is None:
 
204
            if debug:
 
205
                sys.stderr.write(u"Starting checker for %s\n"
 
206
                                 % self.name)
330
207
            try:
331
 
                # In case check_command has exactly one % operator
332
 
                command = self.check_command % self.host
 
208
                command = self.check_command % self.fqdn
333
209
            except TypeError:
334
 
                # Escape attributes for the shell
335
210
                escaped_attrs = dict((key, re.escape(str(val)))
336
211
                                     for key, val in
337
212
                                     vars(self).iteritems())
338
 
                try:
339
 
                    command = self.check_command % escaped_attrs
340
 
                except TypeError, error:
341
 
                    logger.error(u'Could not format string "%s":'
342
 
                                 u' %s', self.check_command, error)
343
 
                    return True # Try again later
 
213
                command = self.check_command % escaped_attrs
344
214
            try:
345
 
                logger.info(u"Starting checker %r for %s",
346
 
                            command, self.name)
347
 
                # We don't need to redirect stdout and stderr, since
348
 
                # in normal mode, that is already done by daemon(),
349
 
                # and in debug mode we don't want to.  (Stdin is
350
 
                # always replaced by /dev/null.)
351
 
                self.checker = subprocess.Popen(command,
352
 
                                                close_fds=True,
353
 
                                                shell=True, cwd="/")
354
 
                self.checker_callback_tag = gobject.child_watch_add\
355
 
                                            (self.checker.pid,
356
 
                                             self.checker_callback)
357
 
            except OSError, error:
358
 
                logger.error(u"Failed to start subprocess: %s",
359
 
                             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)
360
227
        # Re-run this periodically if run by gobject.timeout_add
361
228
        return True
362
229
    def stop_checker(self):
363
230
        """Force the checker process, if any, to stop."""
364
 
        if self.checker_callback_tag:
365
 
            gobject.source_remove(self.checker_callback_tag)
366
 
            self.checker_callback_tag = None
367
 
        if getattr(self, "checker", None) is None:
 
231
        if not hasattr(self, "checker") or self.checker is None:
368
232
            return
369
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
370
 
        try:
371
 
            os.kill(self.checker.pid, signal.SIGTERM)
372
 
            #os.sleep(0.5)
373
 
            #if self.checker.poll() is None:
374
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
375
 
        except OSError, error:
376
 
            if error.errno != errno.ESRCH: # No such process
377
 
                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)
378
238
        self.checker = None
379
 
    def still_valid(self):
 
239
    def still_valid(self, now=None):
380
240
        """Has the timeout not yet passed for this client?"""
381
 
        now = datetime.datetime.now()
382
 
        if self.last_checked_ok is None:
 
241
        if now is None:
 
242
            now = datetime.datetime.now()
 
243
        if self.last_seen is None:
383
244
            return now < (self.created + self.timeout)
384
245
        else:
385
 
            return now < (self.last_checked_ok + self.timeout)
 
246
            return now < (self.last_seen + self.timeout)
386
247
 
387
248
 
388
249
def peer_certificate(session):
389
 
    "Return the peer's OpenPGP certificate as a bytestring"
390
250
    # If not an OpenPGP certificate...
391
251
    if gnutls.library.functions.gnutls_certificate_type_get\
392
252
            (session._c_object) \
403
263
 
404
264
 
405
265
def fingerprint(openpgp):
406
 
    "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))
407
270
    # New GnuTLS "datum" with the OpenPGP public key
408
271
    datum = gnutls.library.types.gnutls_datum_t\
409
272
        (ctypes.cast(ctypes.c_char_p(openpgp),
410
273
                     ctypes.POINTER(ctypes.c_ubyte)),
411
274
         ctypes.c_uint(len(openpgp)))
412
 
    # New empty GnuTLS certificate
413
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
414
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
415
 
        (ctypes.byref(crt))
416
275
    # Import the OpenPGP public key into the certificate
417
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
418
 
                    (crt, ctypes.byref(datum),
419
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
420
 
    # Verify the self signature in the key
421
 
    crtverify = ctypes.c_uint()
422
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
423
 
        (crt, 0, ctypes.byref(crtverify))
424
 
    if crtverify.value != 0:
425
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
426
 
        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)
427
280
    # New buffer for the fingerprint
428
 
    buf = ctypes.create_string_buffer(20)
429
 
    buf_len = ctypes.c_size_t()
 
281
    buffer = ctypes.create_string_buffer(20)
 
282
    buffer_length = ctypes.c_size_t()
430
283
    # Get the fingerprint from the certificate into the buffer
431
284
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
432
 
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
 
285
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
433
286
    # Deinit the certificate
434
287
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
435
288
    # Convert the buffer to a Python bytestring
436
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
289
    fpr = ctypes.string_at(buffer, buffer_length.value)
437
290
    # Convert the bytestring to hexadecimal notation
438
291
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
439
292
    return hex_fpr
440
293
 
441
294
 
442
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
295
class tcp_handler(SocketServer.BaseRequestHandler, object):
443
296
    """A TCP request handler class.
444
297
    Instantiated by IPv6_TCPServer for each request to handle it.
445
298
    Note: This will run in its own forked process."""
446
299
    
447
300
    def handle(self):
448
 
        logger.info(u"TCP connection from: %s",
449
 
                     unicode(self.client_address))
450
 
        session = gnutls.connection.ClientSession\
451
 
                  (self.request, gnutls.connection.X509Credentials())
452
 
        
453
 
        line = self.request.makefile().readline()
454
 
        logger.debug(u"Protocol version: %r", line)
455
 
        try:
456
 
            if int(line.strip().split()[0]) > 1:
457
 
                raise RuntimeError
458
 
        except (ValueError, IndexError, RuntimeError), error:
459
 
            logger.error(u"Unknown protocol version: %s", error)
460
 
            return
461
 
        
462
 
        # Note: gnutls.connection.X509Credentials is really a generic
463
 
        # GnuTLS certificate credentials object so long as no X.509
464
 
        # keys are added to it.  Therefore, we can use it here despite
465
 
        # 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())
466
310
        
467
311
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
468
312
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
469
313
        #                "+DHE-DSS"))
470
 
        priority = "NORMAL"             # Fallback default, since this
471
 
                                        # MUST be set.
472
 
        if self.server.settings["priority"]:
473
 
            priority = self.server.settings["priority"]
 
314
        priority = "SECURE256"
 
315
        
474
316
        gnutls.library.functions.gnutls_priority_set_direct\
475
 
            (session._c_object, priority, None)
 
317
            (session._c_object, priority, None);
476
318
        
477
319
        try:
478
320
            session.handshake()
479
321
        except gnutls.errors.GNUTLSError, error:
480
 
            logger.warning(u"Handshake failed: %s", error)
 
322
            if debug:
 
323
                sys.stderr.write(u"Handshake failed: %s\n" % error)
481
324
            # Do not run session.bye() here: the session is not
482
325
            # established.  Just abandon the request.
483
326
            return
484
327
        try:
485
328
            fpr = fingerprint(peer_certificate(session))
486
329
        except (TypeError, gnutls.errors.GNUTLSError), error:
487
 
            logger.warning(u"Bad certificate: %s", error)
 
330
            if debug:
 
331
                sys.stderr.write(u"Bad certificate: %s\n" % error)
488
332
            session.bye()
489
333
            return
490
 
        logger.debug(u"Fingerprint: %s", fpr)
 
334
        if debug:
 
335
            sys.stderr.write(u"Fingerprint: %s\n" % fpr)
491
336
        client = None
492
 
        for c in self.server.clients:
 
337
        for c in clients:
493
338
            if c.fingerprint == fpr:
494
339
                client = c
495
340
                break
496
 
        if not client:
497
 
            logger.warning(u"Client not found for fingerprint: %s",
498
 
                           fpr)
499
 
            session.bye()
500
 
            return
501
341
        # Have to check if client.still_valid(), since it is possible
502
342
        # that the client timed out while establishing the GnuTLS
503
343
        # session.
504
 
        if not client.still_valid():
505
 
            logger.warning(u"Client %(name)s is invalid",
506
 
                           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)
507
352
            session.bye()
508
353
            return
509
354
        sent_size = 0
510
355
        while sent_size < len(client.secret):
511
356
            sent = session.send(client.secret[sent_size:])
512
 
            logger.debug(u"Sent: %d, remaining: %d",
513
 
                         sent, len(client.secret)
514
 
                         - (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)))
515
361
            sent_size += sent
516
362
        session.bye()
517
363
 
519
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
520
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
521
367
    Attributes:
522
 
        settings:       Server settings
 
368
        options:        Command line options
523
369
        clients:        Set() of Client objects
524
 
        enabled:        Boolean; whether this server is activated yet
525
370
    """
526
371
    address_family = socket.AF_INET6
527
372
    def __init__(self, *args, **kwargs):
528
 
        if "settings" in kwargs:
529
 
            self.settings = kwargs["settings"]
530
 
            del kwargs["settings"]
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
531
376
        if "clients" in kwargs:
532
377
            self.clients = kwargs["clients"]
533
378
            del kwargs["clients"]
534
 
        self.enabled = False
535
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
379
        return super(type(self), self).__init__(*args, **kwargs)
536
380
    def server_bind(self):
537
381
        """This overrides the normal server_bind() function
538
382
        to bind to an interface if one was specified, and also NOT to
539
383
        bind to an address or port if they were not specified."""
540
 
        if self.settings["interface"]:
541
 
            # 25 is from /usr/include/asm-i486/socket.h
542
 
            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
543
388
            try:
544
389
                self.socket.setsockopt(socket.SOL_SOCKET,
545
 
                                       SO_BINDTODEVICE,
546
 
                                       self.settings["interface"])
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
547
392
            except socket.error, error:
548
393
                if error[0] == errno.EPERM:
549
 
                    logger.error(u"No permission to"
550
 
                                 u" bind to interface %s",
551
 
                                 self.settings["interface"])
 
394
                    sys.stderr.write(u"Warning: No permission to" \
 
395
                                     u" bind to interface %s\n"
 
396
                                     % self.options.interface)
552
397
                else:
553
398
                    raise error
554
399
        # Only bind(2) the socket if we really need to.
557
402
                in6addr_any = "::"
558
403
                self.server_address = (in6addr_any,
559
404
                                       self.server_address[1])
560
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
561
406
                self.server_address = (self.server_address[0],
562
407
                                       0)
563
 
#                 if self.settings["interface"]:
564
 
#                     self.server_address = (self.server_address[0],
565
 
#                                            0, # port
566
 
#                                            0, # flowinfo
567
 
#                                            if_nametoindex
568
 
#                                            (self.settings
569
 
#                                             ["interface"]))
570
 
            return super(IPv6_TCPServer, self).server_bind()
571
 
    def server_activate(self):
572
 
        if self.enabled:
573
 
            return super(IPv6_TCPServer, self).server_activate()
574
 
    def enable(self):
575
 
        self.enabled = True
 
408
            return super(type(self), self).server_bind()
576
409
 
577
410
 
578
411
def string_to_delta(interval):
588
421
    datetime.timedelta(1)
589
422
    >>> string_to_delta(u'1w')
590
423
    datetime.timedelta(7)
591
 
    >>> string_to_delta('5m 30s')
592
 
    datetime.timedelta(0, 330)
593
424
    """
594
 
    timevalue = datetime.timedelta(0)
595
 
    for s in interval.split():
596
 
        try:
597
 
            suffix = unicode(s[-1])
598
 
            value = int(s[:-1])
599
 
            if suffix == u"d":
600
 
                delta = datetime.timedelta(value)
601
 
            elif suffix == u"s":
602
 
                delta = datetime.timedelta(0, value)
603
 
            elif suffix == u"m":
604
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
605
 
            elif suffix == u"h":
606
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
607
 
            elif suffix == u"w":
608
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
609
 
            else:
610
 
                raise ValueError
611
 
        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:
612
439
            raise ValueError
613
 
        timevalue += delta
614
 
    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()
615
477
 
616
478
 
617
479
def server_state_changed(state):
618
 
    """Derived from the Avahi example code"""
 
480
    """From the Avahi server example code"""
619
481
    if state == avahi.SERVER_COLLISION:
620
 
        logger.error(u"Zeroconf server name collision")
621
 
        service.remove()
 
482
        sys.stderr.write(u"WARNING: Server name collision\n")
 
483
        remove_service()
622
484
    elif state == avahi.SERVER_RUNNING:
623
 
        service.add()
 
485
        add_service()
624
486
 
625
487
 
626
488
def entry_group_state_changed(state, error):
627
 
    """Derived from the Avahi example code"""
628
 
    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)
629
494
    
630
495
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
631
 
        logger.debug(u"Zeroconf service established.")
 
496
        if debug:
 
497
            sys.stderr.write(u"Service established.\n")
632
498
    elif state == avahi.ENTRY_GROUP_COLLISION:
633
 
        logger.warning(u"Zeroconf service name collision.")
634
 
        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()
635
513
    elif state == avahi.ENTRY_GROUP_FAILURE:
636
 
        logger.critical(u"Avahi: Error in group state changed %s",
637
 
                        unicode(error))
638
 
        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
 
639
519
 
640
520
def if_nametoindex(interface):
641
 
    """Call the C function if_nametoindex(), or equivalent"""
642
 
    global if_nametoindex
 
521
    """Call the C function if_nametoindex()"""
643
522
    try:
644
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
645
 
            (ctypes.util.find_library("c")).if_nametoindex
 
523
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
524
        return libc.if_nametoindex(interface)
646
525
    except (OSError, AttributeError):
647
526
        if "struct" not in sys.modules:
648
527
            import struct
649
528
        if "fcntl" not in sys.modules:
650
529
            import fcntl
651
 
        def if_nametoindex(interface):
652
 
            "Get an interface index the hard way, i.e. using fcntl()"
653
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
654
 
            s = socket.socket()
655
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
656
 
                                struct.pack("16s16x", interface))
657
 
            s.close()
658
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
659
 
            return interface_index
660
 
    return if_nametoindex(interface)
661
 
 
662
 
 
663
 
def daemon(nochdir = False, noclose = False):
664
 
    """See daemon(3).  Standard BSD Unix function.
665
 
    This should really exist as os.daemon, but it doesn't (yet)."""
666
 
    if os.fork():
667
 
        sys.exit()
668
 
    os.setsid()
669
 
    if not nochdir:
670
 
        os.chdir("/")
671
 
    if os.fork():
672
 
        sys.exit()
673
 
    if not noclose:
674
 
        # Close all standard open file descriptors
675
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
676
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
677
 
            raise OSError(errno.ENODEV,
678
 
                          "/dev/null not a character device")
679
 
        os.dup2(null, sys.stdin.fileno())
680
 
        os.dup2(null, sys.stdout.fileno())
681
 
        os.dup2(null, sys.stderr.fileno())
682
 
        if null > 2:
683
 
            os.close(null)
684
 
 
685
 
 
686
 
def main():
687
 
    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()
688
541
    parser.add_option("-i", "--interface", type="string",
689
 
                      metavar="IF", help="Bind to interface IF")
690
 
    parser.add_option("-a", "--address", type="string",
691
 
                      help="Address to listen for requests on")
692
 
    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,
693
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")
694
564
    parser.add_option("--check", action="store_true", default=False,
695
565
                      help="Run self-test")
696
 
    parser.add_option("--debug", action="store_true",
697
 
                      help="Debug mode; run in foreground and log to"
698
 
                      " terminal")
699
 
    parser.add_option("--priority", type="string", help="GnuTLS"
700
 
                      " priority string (see GnuTLS documentation)")
701
 
    parser.add_option("--servicename", type="string", metavar="NAME",
702
 
                      help="Zeroconf service name")
703
 
    parser.add_option("--configdir", type="string",
704
 
                      default="/etc/mandos", metavar="DIR",
705
 
                      help="Directory to search for configuration"
706
 
                      " files")
707
 
    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()
708
569
    
709
570
    if options.check:
710
571
        import doctest
711
572
        doctest.testmod()
712
573
        sys.exit()
713
574
    
714
 
    # Default values for config file for server-global settings
715
 
    server_defaults = { "interface": "",
716
 
                        "address": "",
717
 
                        "port": "",
718
 
                        "debug": "False",
719
 
                        "priority":
720
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
721
 
                        "servicename": "Mandos",
722
 
                        }
723
 
    
724
 
    # Parse config file for server-global settings
725
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
726
 
    del server_defaults
727
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
728
 
    # Convert the SafeConfigParser object to a dict
729
 
    server_settings = server_config.defaults()
730
 
    # Use getboolean on the boolean config option
731
 
    server_settings["debug"] = server_config.getboolean\
732
 
                               ("DEFAULT", "debug")
733
 
    del server_config
734
 
    
735
 
    # Override the settings from the config file with command line
736
 
    # options, if set.
737
 
    for option in ("interface", "address", "port", "debug",
738
 
                   "priority", "servicename", "configdir"):
739
 
        value = getattr(options, option)
740
 
        if value is not None:
741
 
            server_settings[option] = value
742
 
    del options
743
 
    # Now we have our good server settings in "server_settings"
744
 
    
745
 
    debug = server_settings["debug"]
746
 
    
747
 
    if not debug:
748
 
        syslogger.setLevel(logging.WARNING)
749
 
        console.setLevel(logging.WARNING)
750
 
    
751
 
    if server_settings["servicename"] != "Mandos":
752
 
        syslogger.setFormatter(logging.Formatter\
753
 
                               ('Mandos (%s): %%(levelname)s:'
754
 
                                ' %%(message)s'
755
 
                                % server_settings["servicename"]))
756
 
    
757
 
    # Parse config file with clients
758
 
    client_defaults = { "timeout": "1h",
759
 
                        "interval": "5m",
760
 
                        "checker": "fping -q -- %(host)s",
761
 
                        "host": "",
762
 
                        }
763
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
764
 
    client_config.read(os.path.join(server_settings["configdir"],
765
 
                                    "clients.conf"))
766
 
    
767
 
    clients = Set()
768
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
769
 
                                 server_settings["port"]),
770
 
                                TCP_handler,
771
 
                                settings=server_settings,
772
 
                                clients=clients)
773
 
    pidfilename = "/var/run/mandos.pid"
774
 
    try:
775
 
        pidfile = open(pidfilename, "w")
776
 
    except IOError, error:
777
 
        logger.error("Could not open file %r", pidfilename)
778
 
    
779
 
    uid = 65534
780
 
    gid = 65534
781
 
    try:
782
 
        uid = pwd.getpwnam("mandos").pw_uid
783
 
    except KeyError:
784
 
        try:
785
 
            uid = pwd.getpwnam("nobody").pw_uid
786
 
        except KeyError:
787
 
            pass
788
 
    try:
789
 
        gid = pwd.getpwnam("mandos").pw_gid
790
 
    except KeyError:
791
 
        try:
792
 
            gid = pwd.getpwnam("nogroup").pw_gid
793
 
        except KeyError:
794
 
            pass
795
 
    try:
796
 
        os.setuid(uid)
797
 
        os.setgid(gid)
798
 
    except OSError, error:
799
 
        if error[0] != errno.EPERM:
800
 
            raise error
801
 
    
802
 
    global service
803
 
    service = AvahiService(name = server_settings["servicename"],
804
 
                           servicetype = "_mandos._tcp", )
805
 
    if server_settings["interface"]:
806
 
        service.interface = if_nametoindex\
807
 
                            (server_settings["interface"])
808
 
    
809
 
    global main_loop
810
 
    global bus
811
 
    global server
812
 
    # 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
813
592
    DBusGMainLoop(set_as_default=True )
814
593
    main_loop = gobject.MainLoop()
815
594
    bus = dbus.SystemBus()
816
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
817
 
                                           avahi.DBUS_PATH_SERVER),
818
 
                            avahi.DBUS_INTERFACE_SERVER)
 
595
    server = dbus.Interface(
 
596
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
597
            avahi.DBUS_INTERFACE_SERVER )
819
598
    # End of Avahi example code
820
599
    
 
600
    debug = options.debug
 
601
    
 
602
    clients = Set()
821
603
    def remove_from_clients(client):
822
604
        clients.remove(client)
823
605
        if not clients:
824
 
            logger.critical(u"No clients left, exiting")
825
 
            sys.exit()
 
606
            if debug:
 
607
                sys.stderr.write(u"No clients left, exiting\n")
 
608
            main_loop.quit()
826
609
    
827
 
    clients.update(Set(Client(name = section,
 
610
    clients.update(Set(Client(name=section, options=options,
828
611
                              stop_hook = remove_from_clients,
829
 
                              config
830
 
                              = dict(client_config.items(section)))
 
612
                              **(dict(client_config\
 
613
                                      .items(section))))
831
614
                       for section in client_config.sections()))
832
 
    if not clients:
833
 
        logger.critical(u"No clients defined")
834
 
        sys.exit(1)
835
 
    
836
 
    if debug:
837
 
        # Redirect stdin so all checkers get /dev/null
838
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
839
 
        os.dup2(null, sys.stdin.fileno())
840
 
        if null > 2:
841
 
            os.close(null)
842
 
    else:
843
 
        # No console logging
844
 
        logger.removeHandler(console)
845
 
        # Close all input and output, do double fork, etc.
846
 
        daemon()
847
 
    
848
 
    try:
849
 
        pid = os.getpid()
850
 
        pidfile.write(str(pid) + "\n")
851
 
        pidfile.close()
852
 
        del pidfile
853
 
    except IOError:
854
 
        logger.error(u"Could not write to file %r with PID %d",
855
 
                     pidfilename, pid)
856
 
    except NameError:
857
 
        # "pidfile" was never created
858
 
        pass
859
 
    del pidfilename
860
 
    
861
 
    def cleanup():
862
 
        "Cleanup function; run on exit"
863
 
        global group
864
 
        # From the Avahi example code
865
 
        if not group is None:
866
 
            group.Free()
867
 
            group = None
868
 
        # End of Avahi example code
869
 
        
870
 
        while clients:
871
 
            client = clients.pop()
872
 
            client.stop_hook = None
873
 
            client.stop()
874
 
    
875
 
    atexit.register(cleanup)
876
 
    
877
 
    if not debug:
878
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
879
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
880
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
881
 
    
882
615
    for client in clients:
883
616
        client.start()
884
617
    
885
 
    tcp_server.enable()
886
 
    tcp_server.server_activate()
887
 
    
888
 
    # Find out what port we got
889
 
    service.port = tcp_server.socket.getsockname()[1]
890
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
891
 
                u" scope_id %d" % tcp_server.socket.getsockname())
892
 
    
893
 
    #service.interface = tcp_server.socket.getsockname()[3]
894
 
    
 
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)
895
639
    try:
896
 
        # From the Avahi example code
897
 
        server.connect_to_signal("StateChanged", server_state_changed)
898
 
        try:
899
 
            server_state_changed(server.GetState())
900
 
        except dbus.exceptions.DBusException, error:
901
 
            logger.critical(u"DBusException: %s", error)
902
 
            sys.exit(1)
903
 
        # End of Avahi example code
904
 
        
905
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
906
 
                             lambda *args, **kwargs:
907
 
                             tcp_server.handle_request\
908
 
                             (*args[2:], **kwargs) or True)
909
 
        
910
 
        logger.debug(u"Starting main loop")
911
640
        main_loop.run()
912
 
    except AvahiError, error:
913
 
        logger.critical(u"AvahiError: %s" + unicode(error))
914
 
        sys.exit(1)
915
641
    except KeyboardInterrupt:
916
 
        if debug:
917
 
            print
 
642
        print
 
643
    
 
644
    # Cleanup here
918
645
 
919
 
if __name__ == '__main__':
920
 
    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()