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  • Committer: Teddy Hogeborn
  • Date: 2008-07-22 06:23:29 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080722062329-jaex5y5mslf6sqjx
* mandos-clients.conf ([DEFAULT]): New section.

* plugins.d/mandosclient.c (start_mandos_communication): Only print if
                                                         debugging.
                                                         Print server
                                                         name.
                                                         Bug fix: Loop
                                                         until suc-
                                                         cess.

* server.py (serverName): Set via option, not globally.
  (Client.__init__): Removed argument "options".  Require "timeout"
                     and "interval" arguments.
  (tcp_handler.handle): Set "priority" from self.server.options.
  (main): Removed "--timeout" and "--interval" options.  New options
          "--priority" and "--servicename".  Add defaults for
          "timeout" and "interval".  Set "serviceName" from options.
          Do not pass "options" to "Client()".

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Lines of Context:
server.py
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6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
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".
 
9
# following functions: "add_service", "remove_service",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
12
# 
13
 
# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
13
# Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
 
14
# Påhlsson.
15
15
# 
16
16
# This program is free software: you can redistribute it and/or modify
17
17
# it under the terms of the GNU General Public License as published by
26
26
# You should have received a copy of the GNU General Public License
27
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
28
28
# 
29
 
# Contact the authors at <mandos@fukt.bsnet.se>.
 
29
# Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
 
30
# <https://www.fukt.bsnet.se/~teddy/>.
30
31
# 
31
32
 
32
33
from __future__ import division
61
62
from dbus.mainloop.glib import DBusGMainLoop
62
63
import ctypes
63
64
 
64
 
version = "1.0"
 
65
# Brief description of the operation of this program:
 
66
# 
 
67
# This server announces itself as a Zeroconf service.  Connecting
 
68
# clients use the TLS protocol, with the unusual quirk that this
 
69
# server program acts as a TLS "client" while the connecting clients
 
70
# acts as a TLS "server".  The clients (acting as a TLS "server") must
 
71
# supply an OpenPGP certificate, and the fingerprint of this
 
72
# certificate is used by this server to look up (in a list read from a
 
73
# file at start time) which binary blob to give the client.  No other
 
74
# authentication or authorization is done by this server.
 
75
 
65
76
 
66
77
logger = logging.Logger('mandos')
67
78
syslogger = logging.handlers.SysLogHandler\
68
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
 
             address = "/dev/log")
 
79
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
70
80
syslogger.setFormatter(logging.Formatter\
71
 
                        ('Mandos: %(levelname)s: %(message)s'))
 
81
                        ('%(levelname)s: %(message)s'))
72
82
logger.addHandler(syslogger)
73
 
 
74
 
console = logging.StreamHandler()
75
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
 
                                       ' %(message)s'))
77
 
logger.addHandler(console)
78
 
 
79
 
class AvahiError(Exception):
80
 
    def __init__(self, value):
81
 
        self.value = value
82
 
    def __str__(self):
83
 
        return repr(self.value)
84
 
 
85
 
class AvahiServiceError(AvahiError):
86
 
    pass
87
 
 
88
 
class AvahiGroupError(AvahiError):
89
 
    pass
90
 
 
91
 
 
92
 
class AvahiService(object):
93
 
    """An Avahi (Zeroconf) service.
94
 
    Attributes:
95
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
96
 
               Used to optionally bind to the specified interface.
97
 
    name: string; Example: 'Mandos'
98
 
    type: string; Example: '_mandos._tcp'.
99
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
100
 
    port: integer; what port to announce
101
 
    TXT: list of strings; TXT record for the service
102
 
    domain: string; Domain to publish on, default to .local if empty.
103
 
    host: string; Host to publish records for, default is localhost
104
 
    max_renames: integer; maximum number of renames
105
 
    rename_count: integer; counter so we only rename after collisions
106
 
                  a sensible number of times
107
 
    """
108
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
 
                 type = None, port = None, TXT = None, domain = "",
110
 
                 host = "", max_renames = 32768):
111
 
        self.interface = interface
112
 
        self.name = name
113
 
        self.type = type
114
 
        self.port = port
115
 
        if TXT is None:
116
 
            self.TXT = []
117
 
        else:
118
 
            self.TXT = TXT
119
 
        self.domain = domain
120
 
        self.host = host
121
 
        self.rename_count = 0
122
 
    def rename(self):
123
 
        """Derived from the Avahi example code"""
124
 
        if self.rename_count >= self.max_renames:
125
 
            logger.critical(u"No suitable service name found after %i"
126
 
                            u" retries, exiting.", rename_count)
127
 
            raise AvahiServiceError("Too many renames")
128
 
        name = server.GetAlternativeServiceName(name)
129
 
        logger.error(u"Changing name to %r ...", name)
130
 
        syslogger.setFormatter(logging.Formatter\
131
 
                               ('Mandos (%s): %%(levelname)s:'
132
 
                               ' %%(message)s' % name))
133
 
        self.remove()
134
 
        self.add()
135
 
        self.rename_count += 1
136
 
    def remove(self):
137
 
        """Derived from the Avahi example code"""
138
 
        if group is not None:
139
 
            group.Reset()
140
 
    def add(self):
141
 
        """Derived from the Avahi example code"""
142
 
        global group
143
 
        if group is None:
144
 
            group = dbus.Interface\
145
 
                    (bus.get_object(avahi.DBUS_NAME,
146
 
                                    server.EntryGroupNew()),
147
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
148
 
            group.connect_to_signal('StateChanged',
149
 
                                    entry_group_state_changed)
150
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
151
 
                     service.name, service.type)
152
 
        group.AddService(
153
 
                self.interface,         # interface
154
 
                avahi.PROTO_INET6,      # protocol
155
 
                dbus.UInt32(0),         # flags
156
 
                self.name, self.type,
157
 
                self.domain, self.host,
158
 
                dbus.UInt16(self.port),
159
 
                avahi.string_array_to_txt_array(self.TXT))
160
 
        group.Commit()
161
 
 
 
83
del syslogger
 
84
 
 
85
# This variable is used to optionally bind to a specified interface.
 
86
# It is a global variable to fit in with the other variables from the
 
87
# Avahi example code.
 
88
serviceInterface = avahi.IF_UNSPEC
162
89
# From the Avahi example code:
163
 
group = None                            # our entry group
 
90
serviceName = None
 
91
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
92
servicePort = None                      # Not known at startup
 
93
serviceTXT = []                         # TXT record for the service
 
94
domain = ""                  # Domain to publish on, default to .local
 
95
host = ""          # Host to publish records for, default to localhost
 
96
group = None #our entry group
 
97
rename_count = 12       # Counter so we only rename after collisions a
 
98
                        # sensible number of times
164
99
# End of Avahi example code
165
100
 
166
101
 
171
106
    fingerprint: string (40 or 32 hexadecimal digits); used to
172
107
                 uniquely identify the client
173
108
    secret:    bytestring; sent verbatim (over TLS) to client
174
 
    host:      string; available for use by the checker command
175
 
    created:   datetime.datetime(); object creation, not client host
176
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
177
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
178
 
                                     until this client is invalid
 
109
    fqdn:      string (FQDN); available for use by the checker command
 
110
    created:   datetime.datetime()
 
111
    last_seen: datetime.datetime() or None if not yet seen
 
112
    timeout:   datetime.timedelta(); How long from last_seen until
 
113
                                     this client is invalid
179
114
    interval:  datetime.timedelta(); How often to start a new checker
180
115
    stop_hook: If set, called by stop() as stop_hook(self)
181
116
    checker:   subprocess.Popen(); a running checker process used
182
117
                                   to see if the client lives.
183
 
                                   'None' if no process is running.
 
118
                                   Is None if no process is running.
184
119
    checker_initiator_tag: a gobject event source tag, or None
185
120
    stop_initiator_tag:    - '' -
186
121
    checker_callback_tag:  - '' -
187
122
    checker_command: string; External command which is run to check if
188
 
                     client lives.  %() expansions are done at
 
123
                     client lives.  %()s expansions are done at
189
124
                     runtime with vars(self) as dict, so that for
190
125
                     instance %(name)s can be used in the command.
191
126
    Private attibutes:
192
127
    _timeout: Real variable for 'timeout'
193
128
    _interval: Real variable for 'interval'
194
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
129
    _timeout_milliseconds: Used by gobject.timeout_add()
195
130
    _interval_milliseconds: - '' -
196
131
    """
197
132
    def _set_timeout(self, timeout):
217
152
    interval = property(lambda self: self._interval,
218
153
                        _set_interval)
219
154
    del _set_interval
220
 
    def __init__(self, name = None, stop_hook=None, config={}):
221
 
        """Note: the 'checker' key in 'config' sets the
222
 
        'checker_command' attribute and *not* the 'checker'
223
 
        attribute."""
 
155
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
156
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
157
                 interval=-1, checker=None):
 
158
        """Note: the 'checker' argument sets the 'checker_command'
 
159
        attribute and not the 'checker' attribute.."""
224
160
        self.name = name
225
161
        logger.debug(u"Creating client %r", self.name)
226
 
        # Uppercase and remove spaces from fingerprint for later
227
 
        # comparison purposes with return value from the fingerprint()
228
 
        # function
229
 
        self.fingerprint = config["fingerprint"].upper()\
230
 
                           .replace(u" ", u"")
 
162
        # Uppercase and remove spaces from fingerprint
 
163
        # for later comparison purposes with return value of
 
164
        # the fingerprint() function
 
165
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
231
166
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
232
 
        if "secret" in config:
233
 
            self.secret = config["secret"].decode(u"base64")
234
 
        elif "secfile" in config:
235
 
            sf = open(config["secfile"])
 
167
        if secret:
 
168
            self.secret = secret.decode(u"base64")
 
169
        elif secfile:
 
170
            sf = open(secfile)
236
171
            self.secret = sf.read()
237
172
            sf.close()
238
173
        else:
239
 
            raise TypeError(u"No secret or secfile for client %s"
240
 
                            % self.name)
241
 
        self.host = config.get("host", "")
 
174
            raise RuntimeError(u"No secret or secfile for client %s"
 
175
                               % self.name)
 
176
        self.fqdn = fqdn                # string
242
177
        self.created = datetime.datetime.now()
243
 
        self.last_checked_ok = None
244
 
        self.timeout = string_to_delta(config["timeout"])
245
 
        self.interval = string_to_delta(config["interval"])
 
178
        self.last_seen = None
 
179
        self.timeout = string_to_delta(timeout)
 
180
        self.interval = string_to_delta(interval)
246
181
        self.stop_hook = stop_hook
247
182
        self.checker = None
248
183
        self.checker_initiator_tag = None
249
184
        self.stop_initiator_tag = None
250
185
        self.checker_callback_tag = None
251
 
        self.check_command = config["checker"]
 
186
        self.check_command = checker
252
187
    def start(self):
253
188
        """Start this client's checker and timeout hooks"""
254
189
        # Schedule a new checker to be started an 'interval' from now,
264
199
                                   self.stop)
265
200
    def stop(self):
266
201
        """Stop this client.
267
 
        The possibility that a client might be restarted is left open,
268
 
        but not currently used."""
 
202
        The possibility that this client might be restarted is left
 
203
        open, but not currently used."""
269
204
        # If this client doesn't have a secret, it is already stopped.
270
 
        if hasattr(self, "secret") and self.secret:
271
 
            logger.info(u"Stopping client %s", self.name)
 
205
        if self.secret:
 
206
            logger.debug(u"Stopping client %s", self.name)
272
207
            self.secret = None
273
208
        else:
274
209
            return False
275
 
        if getattr(self, "stop_initiator_tag", False):
 
210
        if hasattr(self, "stop_initiator_tag") \
 
211
               and self.stop_initiator_tag:
276
212
            gobject.source_remove(self.stop_initiator_tag)
277
213
            self.stop_initiator_tag = None
278
 
        if getattr(self, "checker_initiator_tag", False):
 
214
        if hasattr(self, "checker_initiator_tag") \
 
215
               and self.checker_initiator_tag:
279
216
            gobject.source_remove(self.checker_initiator_tag)
280
217
            self.checker_initiator_tag = None
281
218
        self.stop_checker()
293
230
        self.checker = None
294
231
        if os.WIFEXITED(condition) \
295
232
               and (os.WEXITSTATUS(condition) == 0):
296
 
            logger.info(u"Checker for %(name)s succeeded",
297
 
                        vars(self))
298
 
            self.last_checked_ok = now
 
233
            logger.debug(u"Checker for %(name)s succeeded",
 
234
                         vars(self))
 
235
            self.last_seen = now
299
236
            gobject.source_remove(self.stop_initiator_tag)
300
237
            self.stop_initiator_tag = gobject.timeout_add\
301
238
                                      (self._timeout_milliseconds,
304
241
            logger.warning(u"Checker for %(name)s crashed?",
305
242
                           vars(self))
306
243
        else:
307
 
            logger.info(u"Checker for %(name)s failed",
308
 
                        vars(self))
 
244
            logger.debug(u"Checker for %(name)s failed",
 
245
                         vars(self))
309
246
    def start_checker(self):
310
247
        """Start a new checker subprocess if one is not running.
311
248
        If a checker already exists, leave it running and do
320
257
        # is as it should be.
321
258
        if self.checker is None:
322
259
            try:
323
 
                # In case check_command has exactly one % operator
324
 
                command = self.check_command % self.host
 
260
                command = self.check_command % self.fqdn
325
261
            except TypeError:
326
 
                # Escape attributes for the shell
327
262
                escaped_attrs = dict((key, re.escape(str(val)))
328
263
                                     for key, val in
329
264
                                     vars(self).iteritems())
330
265
                try:
331
266
                    command = self.check_command % escaped_attrs
332
267
                except TypeError, error:
333
 
                    logger.error(u'Could not format string "%s":'
334
 
                                 u' %s', self.check_command, error)
 
268
                    logger.critical(u'Could not format string "%s":'
 
269
                                    u' %s', self.check_command, error)
335
270
                    return True # Try again later
336
271
            try:
337
 
                logger.info(u"Starting checker %r for %s",
338
 
                            command, self.name)
339
 
                self.checker = subprocess.Popen(command,
340
 
                                                close_fds=True,
341
 
                                                shell=True, cwd="/")
 
272
                logger.debug(u"Starting checker %r for %s",
 
273
                             command, self.name)
 
274
                self.checker = subprocess.\
 
275
                               Popen(command,
 
276
                                     close_fds=True, shell=True,
 
277
                                     cwd="/")
342
278
                self.checker_callback_tag = gobject.child_watch_add\
343
279
                                            (self.checker.pid,
344
280
                                             self.checker_callback)
352
288
        if self.checker_callback_tag:
353
289
            gobject.source_remove(self.checker_callback_tag)
354
290
            self.checker_callback_tag = None
355
 
        if getattr(self, "checker", None) is None:
 
291
        if not hasattr(self, "checker") or self.checker is None:
356
292
            return
357
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
293
        logger.debug("Stopping checker for %(name)s", vars(self))
358
294
        try:
359
295
            os.kill(self.checker.pid, signal.SIGTERM)
360
296
            #os.sleep(0.5)
361
297
            #if self.checker.poll() is None:
362
298
            #    os.kill(self.checker.pid, signal.SIGKILL)
363
299
        except OSError, error:
364
 
            if error.errno != errno.ESRCH: # No such process
 
300
            if error.errno != errno.ESRCH:
365
301
                raise
366
302
        self.checker = None
367
 
    def still_valid(self):
 
303
    def still_valid(self, now=None):
368
304
        """Has the timeout not yet passed for this client?"""
369
 
        now = datetime.datetime.now()
370
 
        if self.last_checked_ok is None:
 
305
        if now is None:
 
306
            now = datetime.datetime.now()
 
307
        if self.last_seen is None:
371
308
            return now < (self.created + self.timeout)
372
309
        else:
373
 
            return now < (self.last_checked_ok + self.timeout)
 
310
            return now < (self.last_seen + self.timeout)
374
311
 
375
312
 
376
313
def peer_certificate(session):
392
329
 
393
330
def fingerprint(openpgp):
394
331
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
332
    # New empty GnuTLS certificate
 
333
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
334
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
335
        (ctypes.byref(crt))
395
336
    # New GnuTLS "datum" with the OpenPGP public key
396
337
    datum = gnutls.library.types.gnutls_datum_t\
397
338
        (ctypes.cast(ctypes.c_char_p(openpgp),
398
339
                     ctypes.POINTER(ctypes.c_ubyte)),
399
340
         ctypes.c_uint(len(openpgp)))
400
 
    # New empty GnuTLS certificate
401
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
402
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
403
 
        (ctypes.byref(crt))
404
341
    # Import the OpenPGP public key into the certificate
405
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
406
 
                    (crt, ctypes.byref(datum),
407
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
342
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
343
        (crt,
 
344
         ctypes.byref(datum),
 
345
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
346
    # New buffer for the fingerprint
409
347
    buffer = ctypes.create_string_buffer(20)
410
348
    buffer_length = ctypes.c_size_t()
426
364
    Note: This will run in its own forked process."""
427
365
    
428
366
    def handle(self):
429
 
        logger.info(u"TCP connection from: %s",
 
367
        logger.debug(u"TCP connection from: %s",
430
368
                     unicode(self.client_address))
431
 
        session = gnutls.connection.ClientSession\
432
 
                  (self.request, gnutls.connection.X509Credentials())
433
 
        
434
 
        line = self.request.makefile().readline()
435
 
        logger.debug(u"Protocol version: %r", line)
436
 
        try:
437
 
            if int(line.strip().split()[0]) > 1:
438
 
                raise RuntimeError
439
 
        except (ValueError, IndexError, RuntimeError), error:
440
 
            logger.error(u"Unknown protocol version: %s", error)
441
 
            return
442
 
        
443
 
        # Note: gnutls.connection.X509Credentials is really a generic
444
 
        # GnuTLS certificate credentials object so long as no X.509
445
 
        # keys are added to it.  Therefore, we can use it here despite
446
 
        # using OpenPGP certificates.
 
369
        session = gnutls.connection.ClientSession(self.request,
 
370
                                                  gnutls.connection.\
 
371
                                                  X509Credentials())
447
372
        
448
373
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
449
374
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
450
375
        #                "+DHE-DSS"))
451
 
        priority = "NORMAL"             # Fallback default, since this
452
 
                                        # MUST be set.
453
 
        if self.server.settings["priority"]:
454
 
            priority = self.server.settings["priority"]
 
376
        priority = "NORMAL"
 
377
        if self.server.options.priority:
 
378
            priority = self.server.options.priority
455
379
        gnutls.library.functions.gnutls_priority_set_direct\
456
380
            (session._c_object, priority, None);
457
381
        
458
382
        try:
459
383
            session.handshake()
460
384
        except gnutls.errors.GNUTLSError, error:
461
 
            logger.warning(u"Handshake failed: %s", error)
 
385
            logger.debug(u"Handshake failed: %s", error)
462
386
            # Do not run session.bye() here: the session is not
463
387
            # established.  Just abandon the request.
464
388
            return
465
389
        try:
466
390
            fpr = fingerprint(peer_certificate(session))
467
391
        except (TypeError, gnutls.errors.GNUTLSError), error:
468
 
            logger.warning(u"Bad certificate: %s", error)
 
392
            logger.debug(u"Bad certificate: %s", error)
469
393
            session.bye()
470
394
            return
471
395
        logger.debug(u"Fingerprint: %s", fpr)
474
398
            if c.fingerprint == fpr:
475
399
                client = c
476
400
                break
477
 
        if not client:
478
 
            logger.warning(u"Client not found for fingerprint: %s",
479
 
                           fpr)
480
 
            session.bye()
481
 
            return
482
401
        # Have to check if client.still_valid(), since it is possible
483
402
        # that the client timed out while establishing the GnuTLS
484
403
        # session.
485
 
        if not client.still_valid():
486
 
            logger.warning(u"Client %(name)s is invalid",
487
 
                           vars(client))
 
404
        if (not client) or (not client.still_valid()):
 
405
            if client:
 
406
                logger.debug(u"Client %(name)s is invalid",
 
407
                             vars(client))
 
408
            else:
 
409
                logger.debug(u"Client not found for fingerprint: %s",
 
410
                             fpr)
488
411
            session.bye()
489
412
            return
490
413
        sent_size = 0
500
423
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
501
424
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
502
425
    Attributes:
503
 
        settings:       Server settings
 
426
        options:        Command line options
504
427
        clients:        Set() of Client objects
505
428
    """
506
429
    address_family = socket.AF_INET6
507
430
    def __init__(self, *args, **kwargs):
508
 
        if "settings" in kwargs:
509
 
            self.settings = kwargs["settings"]
510
 
            del kwargs["settings"]
 
431
        if "options" in kwargs:
 
432
            self.options = kwargs["options"]
 
433
            del kwargs["options"]
511
434
        if "clients" in kwargs:
512
435
            self.clients = kwargs["clients"]
513
436
            del kwargs["clients"]
516
439
        """This overrides the normal server_bind() function
517
440
        to bind to an interface if one was specified, and also NOT to
518
441
        bind to an address or port if they were not specified."""
519
 
        if self.settings["interface"]:
520
 
            # 25 is from /usr/include/asm-i486/socket.h
521
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
442
        if self.options.interface:
 
443
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
444
                # From /usr/include/asm-i486/socket.h
 
445
                socket.SO_BINDTODEVICE = 25
522
446
            try:
523
447
                self.socket.setsockopt(socket.SOL_SOCKET,
524
 
                                       SO_BINDTODEVICE,
525
 
                                       self.settings["interface"])
 
448
                                       socket.SO_BINDTODEVICE,
 
449
                                       self.options.interface)
526
450
            except socket.error, error:
527
451
                if error[0] == errno.EPERM:
528
 
                    logger.error(u"No permission to"
529
 
                                 u" bind to interface %s",
530
 
                                 self.settings["interface"])
 
452
                    logger.warning(u"No permission to"
 
453
                                   u" bind to interface %s",
 
454
                                   self.options.interface)
531
455
                else:
532
456
                    raise error
533
457
        # Only bind(2) the socket if we really need to.
536
460
                in6addr_any = "::"
537
461
                self.server_address = (in6addr_any,
538
462
                                       self.server_address[1])
539
 
            elif not self.server_address[1]:
 
463
            elif self.server_address[1] is None:
540
464
                self.server_address = (self.server_address[0],
541
465
                                       0)
542
 
#                 if self.settings["interface"]:
543
 
#                     self.server_address = (self.server_address[0],
544
 
#                                            0, # port
545
 
#                                            0, # flowinfo
546
 
#                                            if_nametoindex
547
 
#                                            (self.settings
548
 
#                                             ["interface"]))
549
466
            return super(type(self), self).server_bind()
550
467
 
551
468
 
583
500
    return delta
584
501
 
585
502
 
 
503
def add_service():
 
504
    """Derived from the Avahi example code"""
 
505
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
506
           domain, host
 
507
    if group is None:
 
508
        group = dbus.Interface(
 
509
                bus.get_object( avahi.DBUS_NAME,
 
510
                                server.EntryGroupNew()),
 
511
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
512
        group.connect_to_signal('StateChanged',
 
513
                                entry_group_state_changed)
 
514
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
515
                 serviceName, serviceType)
 
516
    
 
517
    group.AddService(
 
518
            serviceInterface,           # interface
 
519
            avahi.PROTO_INET6,          # protocol
 
520
            dbus.UInt32(0),             # flags
 
521
            serviceName, serviceType,
 
522
            domain, host,
 
523
            dbus.UInt16(servicePort),
 
524
            avahi.string_array_to_txt_array(serviceTXT))
 
525
    group.Commit()
 
526
 
 
527
 
 
528
def remove_service():
 
529
    """From the Avahi example code"""
 
530
    global group
 
531
    
 
532
    if not group is None:
 
533
        group.Reset()
 
534
 
 
535
 
586
536
def server_state_changed(state):
587
537
    """Derived from the Avahi example code"""
588
538
    if state == avahi.SERVER_COLLISION:
589
 
        logger.error(u"Server name collision")
590
 
        service.remove()
 
539
        logger.warning(u"Server name collision")
 
540
        remove_service()
591
541
    elif state == avahi.SERVER_RUNNING:
592
 
        service.add()
 
542
        add_service()
593
543
 
594
544
 
595
545
def entry_group_state_changed(state, error):
596
546
    """Derived from the Avahi example code"""
 
547
    global serviceName, server, rename_count
 
548
    
597
549
    logger.debug(u"state change: %i", state)
598
550
    
599
551
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
600
552
        logger.debug(u"Service established.")
601
553
    elif state == avahi.ENTRY_GROUP_COLLISION:
602
 
        logger.warning(u"Service name collision.")
603
 
        service.rename()
 
554
        
 
555
        rename_count = rename_count - 1
 
556
        if rename_count > 0:
 
557
            name = server.GetAlternativeServiceName(name)
 
558
            logger.warning(u"Service name collision, "
 
559
                           u"changing name to '%s' ...", name)
 
560
            remove_service()
 
561
            add_service()
 
562
            
 
563
        else:
 
564
            logger.error(u"No suitable service name found after %i"
 
565
                         u" retries, exiting.", n_rename)
 
566
            killme(1)
604
567
    elif state == avahi.ENTRY_GROUP_FAILURE:
605
 
        logger.critical(u"Error in group state changed %s",
606
 
                        unicode(error))
607
 
        raise AvahiGroupError("State changed: %s", str(error))
 
568
        logger.error(u"Error in group state changed %s",
 
569
                     unicode(error))
 
570
        killme(1)
 
571
 
608
572
 
609
573
def if_nametoindex(interface):
610
 
    """Call the C function if_nametoindex(), or equivalent"""
611
 
    global if_nametoindex
 
574
    """Call the C function if_nametoindex()"""
612
575
    try:
613
 
        if "ctypes.util" not in sys.modules:
614
 
            import ctypes.util
615
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
616
 
            (ctypes.util.find_library("c")).if_nametoindex
 
576
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
577
        return libc.if_nametoindex(interface)
617
578
    except (OSError, AttributeError):
618
579
        if "struct" not in sys.modules:
619
580
            import struct
620
581
        if "fcntl" not in sys.modules:
621
582
            import fcntl
622
 
        def if_nametoindex(interface):
623
 
            "Get an interface index the hard way, i.e. using fcntl()"
624
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
625
 
            s = socket.socket()
626
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
627
 
                                struct.pack("16s16x", interface))
628
 
            s.close()
629
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
630
 
            return interface_index
631
 
    return if_nametoindex(interface)
632
 
 
633
 
 
634
 
def daemon(nochdir = False, noclose = False):
 
583
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
584
        s = socket.socket()
 
585
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
586
                            struct.pack("16s16x", interface))
 
587
        s.close()
 
588
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
589
        return interface_index
 
590
 
 
591
 
 
592
def daemon(nochdir, noclose):
635
593
    """See daemon(3).  Standard BSD Unix function.
636
594
    This should really exist as os.daemon, but it doesn't (yet)."""
637
595
    if os.fork():
639
597
    os.setsid()
640
598
    if not nochdir:
641
599
        os.chdir("/")
642
 
    if os.fork():
643
 
        sys.exit()
644
600
    if not noclose:
645
601
        # Close all standard open file descriptors
646
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
602
        null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
647
603
        if not stat.S_ISCHR(os.fstat(null).st_mode):
648
604
            raise OSError(errno.ENODEV,
649
605
                          "/dev/null not a character device")
654
610
            os.close(null)
655
611
 
656
612
 
 
613
def killme(status = 0):
 
614
    logger.debug("Stopping server with exit status %d", status)
 
615
    exitstatus = status
 
616
    if main_loop_started:
 
617
        main_loop.quit()
 
618
    else:
 
619
        sys.exit(status)
 
620
 
 
621
 
657
622
def main():
 
623
    global exitstatus
 
624
    exitstatus = 0
658
625
    global main_loop_started
659
626
    main_loop_started = False
660
627
    
661
 
    parser = OptionParser(version = "%%prog %s" % version)
 
628
    parser = OptionParser()
662
629
    parser.add_option("-i", "--interface", type="string",
663
 
                      metavar="IF", help="Bind to interface IF")
664
 
    parser.add_option("-a", "--address", type="string",
 
630
                      default=None, metavar="IF",
 
631
                      help="Bind to interface IF")
 
632
    parser.add_option("-a", "--address", type="string", default=None,
665
633
                      help="Address to listen for requests on")
666
 
    parser.add_option("-p", "--port", type="int",
 
634
    parser.add_option("-p", "--port", type="int", default=None,
667
635
                      help="Port number to receive requests on")
668
636
    parser.add_option("--check", action="store_true", default=False,
669
637
                      help="Run self-test")
670
 
    parser.add_option("--debug", action="store_true",
671
 
                      help="Debug mode; run in foreground and log to"
672
 
                      " terminal")
673
 
    parser.add_option("--priority", type="string", help="GnuTLS"
674
 
                      " priority string (see GnuTLS documentation)")
675
 
    parser.add_option("--servicename", type="string", metavar="NAME",
676
 
                      help="Zeroconf service name")
677
 
    parser.add_option("--configdir", type="string",
678
 
                      default="/etc/mandos", metavar="DIR",
679
 
                      help="Directory to search for configuration"
680
 
                      " files")
 
638
    parser.add_option("--debug", action="store_true", default=False,
 
639
                      help="Debug mode")
 
640
    parser.add_option("--priority", type="string",
 
641
                      default="SECURE256",
 
642
                      help="GnuTLS priority string"
 
643
                      " (see GnuTLS documentation)")
 
644
    parser.add_option("--servicename", type="string",
 
645
                      default="Mandos", help="Zeroconf service name")
681
646
    (options, args) = parser.parse_args()
682
647
    
683
648
    if options.check:
685
650
        doctest.testmod()
686
651
        sys.exit()
687
652
    
688
 
    # Default values for config file for server-global settings
689
 
    server_defaults = { "interface": "",
690
 
                        "address": "",
691
 
                        "port": "",
692
 
                        "debug": "False",
693
 
                        "priority":
694
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
695
 
                        "servicename": "Mandos",
696
 
                        }
697
 
    
698
 
    # Parse config file for server-global settings
699
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
700
 
    del server_defaults
701
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
 
    server_section = "server"
703
 
    # Convert the SafeConfigParser object to a dict
704
 
    server_settings = dict(server_config.items(server_section))
705
 
    # Use getboolean on the boolean config option
706
 
    server_settings["debug"] = server_config.getboolean\
707
 
                               (server_section, "debug")
708
 
    del server_config
709
 
    
710
 
    # Override the settings from the config file with command line
711
 
    # options, if set.
712
 
    for option in ("interface", "address", "port", "debug",
713
 
                   "priority", "servicename", "configdir"):
714
 
        value = getattr(options, option)
715
 
        if value is not None:
716
 
            server_settings[option] = value
717
 
    del options
718
 
    # Now we have our good server settings in "server_settings"
719
 
    
720
 
    debug = server_settings["debug"]
721
 
    
722
 
    if not debug:
723
 
        syslogger.setLevel(logging.WARNING)
724
 
        console.setLevel(logging.WARNING)
725
 
    
726
 
    if server_settings["servicename"] != "Mandos":
727
 
        syslogger.setFormatter(logging.Formatter\
728
 
                               ('Mandos (%s): %%(levelname)s:'
729
 
                                ' %%(message)s'
730
 
                                % server_settings["servicename"]))
731
 
    
732
 
    # Parse config file with clients
733
 
    client_defaults = { "timeout": "1h",
734
 
                        "interval": "5m",
735
 
                        "checker": "fping -q -- %%(host)s",
736
 
                        }
737
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
738
 
    client_config.read(os.path.join(server_settings["configdir"],
739
 
                                    "clients.conf"))
740
 
    
741
 
    global service
742
 
    service = AvahiService(name = server_settings["servicename"],
743
 
                           type = "_mandos._tcp", );
744
 
    if server_settings["interface"]:
745
 
        service.interface = if_nametoindex(server_settings["interface"])
 
653
    # Parse config file
 
654
    defaults = { "timeout": "1h",
 
655
                 "interval": "5m",
 
656
                 "checker": "fping -q -- %%(fqdn)s",
 
657
                 }
 
658
    client_config = ConfigParser.SafeConfigParser(defaults)
 
659
    #client_config.readfp(open("global.conf"), "global.conf")
 
660
    client_config.read("mandos-clients.conf")
 
661
    
 
662
    global serviceName
 
663
    serviceName = options.servicename;
746
664
    
747
665
    global main_loop
748
666
    global bus
756
674
            avahi.DBUS_INTERFACE_SERVER )
757
675
    # End of Avahi example code
758
676
    
 
677
    debug = options.debug
 
678
    
 
679
    if debug:
 
680
        console = logging.StreamHandler()
 
681
        # console.setLevel(logging.DEBUG)
 
682
        console.setFormatter(logging.Formatter\
 
683
                             ('%(levelname)s: %(message)s'))
 
684
        logger.addHandler(console)
 
685
        del console
 
686
    
759
687
    clients = Set()
760
688
    def remove_from_clients(client):
761
689
        clients.remove(client)
762
690
        if not clients:
763
 
            logger.critical(u"No clients left, exiting")
764
 
            sys.exit()
 
691
            logger.debug(u"No clients left, exiting")
 
692
            killme()
765
693
    
766
 
    clients.update(Set(Client(name = section,
 
694
    clients.update(Set(Client(name=section,
767
695
                              stop_hook = remove_from_clients,
768
 
                              config
769
 
                              = dict(client_config.items(section)))
 
696
                              **(dict(client_config\
 
697
                                      .items(section))))
770
698
                       for section in client_config.sections()))
771
 
    if not clients:
772
 
        logger.critical(u"No clients defined")
773
 
        sys.exit(1)
774
699
    
775
700
    if not debug:
776
 
        logger.removeHandler(console)
777
 
        daemon()
778
 
    
779
 
    pidfilename = "/var/run/mandos/mandos.pid"
780
 
    pid = os.getpid()
781
 
    try:
782
 
        pidfile = open(pidfilename, "w")
783
 
        pidfile.write(str(pid) + "\n")
784
 
        pidfile.close()
785
 
        del pidfile
786
 
    except IOError, err:
787
 
        logger.error(u"Could not write %s file with PID %d",
788
 
                     pidfilename, os.getpid())
 
701
        daemon(False, False)
789
702
    
790
703
    def cleanup():
791
704
        "Cleanup function; run on exit"
805
718
    
806
719
    if not debug:
807
720
        signal.signal(signal.SIGINT, signal.SIG_IGN)
808
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
809
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
721
    signal.signal(signal.SIGHUP, lambda signum, frame: killme())
 
722
    signal.signal(signal.SIGTERM, lambda signum, frame: killme())
810
723
    
811
724
    for client in clients:
812
725
        client.start()
813
726
    
814
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
815
 
                                 server_settings["port"]),
 
727
    tcp_server = IPv6_TCPServer((options.address, options.port),
816
728
                                tcp_handler,
817
 
                                settings=server_settings,
 
729
                                options=options,
818
730
                                clients=clients)
819
 
    # Find out what port we got
820
 
    service.port = tcp_server.socket.getsockname()[1]
821
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
 
                u" scope_id %d" % tcp_server.socket.getsockname())
823
 
    
824
 
    #service.interface = tcp_server.socket.getsockname()[3]
825
 
    
826
 
    try:
827
 
        # From the Avahi example code
828
 
        server.connect_to_signal("StateChanged", server_state_changed)
829
 
        try:
830
 
            server_state_changed(server.GetState())
831
 
        except dbus.exceptions.DBusException, error:
832
 
            logger.critical(u"DBusException: %s", error)
833
 
            sys.exit(1)
834
 
        # End of Avahi example code
835
 
        
836
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
 
                             lambda *args, **kwargs:
838
 
                             tcp_server.handle_request\
839
 
                             (*args[2:], **kwargs) or True)
840
 
        
841
 
        logger.debug(u"Starting main loop")
 
731
    # Find out what random port we got
 
732
    global servicePort
 
733
    servicePort = tcp_server.socket.getsockname()[1]
 
734
    logger.debug(u"Now listening on port %d", servicePort)
 
735
    
 
736
    if options.interface is not None:
 
737
        global serviceInterface
 
738
        serviceInterface = if_nametoindex(options.interface)
 
739
    
 
740
    # From the Avahi example code
 
741
    server.connect_to_signal("StateChanged", server_state_changed)
 
742
    try:
 
743
        server_state_changed(server.GetState())
 
744
    except dbus.exceptions.DBusException, error:
 
745
        logger.critical(u"DBusException: %s", error)
 
746
        killme(1)
 
747
    # End of Avahi example code
 
748
    
 
749
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
750
                         lambda *args, **kwargs:
 
751
                         tcp_server.handle_request(*args[2:],
 
752
                                                   **kwargs) or True)
 
753
    try:
 
754
        logger.debug("Starting main loop")
842
755
        main_loop_started = True
843
756
        main_loop.run()
844
 
    except AvahiError, error:
845
 
        logger.critical(u"AvahiError: %s" + unicode(error))
846
 
        sys.exit(1)
847
757
    except KeyboardInterrupt:
848
758
        if debug:
849
759
            print
 
760
    
 
761
    sys.exit(exitstatus)
850
762
 
851
763
if __name__ == '__main__':
852
764
    main()