/mandos/trunk

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Viewing changes to server.py

plugbasedclient:
        Added support to disable plugins
        Added support to change plugin directory

mandosclient.c
        Fixed some funtion calls that lacked error handling
        small bugfix

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Lines of Context:
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# This program is partly derived from an example program for an Avahi
7
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# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# following functions: "AvahiService.add", "AvahiService.remove",
 
9
# following functions: "add_service", "remove_service",
10
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# "server_state_changed", "entry_group_state_changed", and some lines
11
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# in "main".
12
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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
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16
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# 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
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# 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
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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
65
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66
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# This server announces itself as a Zeroconf service.  Connecting
67
68
# clients use the TLS protocol, with the unusual quirk that this
68
 
# server program acts as a TLS "client" while a connecting client acts
69
 
# as a TLS "server".  The client (acting as a TLS "server") must
 
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
70
71
# supply an OpenPGP certificate, and the fingerprint of this
71
72
# certificate is used by this server to look up (in a list read from a
72
73
# file at start time) which binary blob to give the client.  No other
81
82
logger.addHandler(syslogger)
82
83
del syslogger
83
84
 
84
 
 
85
 
class AvahiError(Exception):
86
 
    def __init__(self, value):
87
 
        self.value = value
88
 
    def __str__(self):
89
 
        return repr(self.value)
90
 
 
91
 
class AvahiServiceError(AvahiError):
92
 
    pass
93
 
 
94
 
class AvahiGroupError(AvahiError):
95
 
    pass
96
 
 
97
 
 
98
 
class AvahiService(object):
99
 
    """An Avahi (Zeroconf) service.
100
 
    Attributes:
101
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
102
 
               Used to optionally bind to the specified interface.
103
 
    name: string; Example: 'Mandos'
104
 
    type: string; Example: '_mandos._tcp'.
105
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
106
 
    port: integer; what port to announce
107
 
    TXT: list of strings; TXT record for the service
108
 
    domain: string; Domain to publish on, default to .local if empty.
109
 
    host: string; Host to publish records for, default is localhost
110
 
    max_renames: integer; maximum number of renames
111
 
    rename_count: integer; counter so we only rename after collisions
112
 
                  a sensible number of times
113
 
    """
114
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 type = None, port = None, TXT = None, domain = "",
116
 
                 host = "", max_renames = 12):
117
 
        self.interface = interface
118
 
        self.name = name
119
 
        self.type = type
120
 
        self.port = port
121
 
        if TXT is None:
122
 
            self.TXT = []
123
 
        else:
124
 
            self.TXT = TXT
125
 
        self.domain = domain
126
 
        self.host = host
127
 
        self.rename_count = 0
128
 
    def rename(self):
129
 
        """Derived from the Avahi example code"""
130
 
        if self.rename_count >= self.max_renames:
131
 
            logger.critical(u"No suitable service name found after %i"
132
 
                            u" retries, exiting.", rename_count)
133
 
            raise AvahiServiceError("Too many renames")
134
 
        name = server.GetAlternativeServiceName(name)
135
 
        logger.error(u"Changing name to %r ...", name)
136
 
        self.remove()
137
 
        self.add()
138
 
        self.rename_count += 1
139
 
    def remove(self):
140
 
        """Derived from the Avahi example code"""
141
 
        if group is not None:
142
 
            group.Reset()
143
 
    def add(self):
144
 
        """Derived from the Avahi example code"""
145
 
        global group
146
 
        if group is None:
147
 
            group = dbus.Interface\
148
 
                    (bus.get_object(avahi.DBUS_NAME,
149
 
                                    server.EntryGroupNew()),
150
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
151
 
            group.connect_to_signal('StateChanged',
152
 
                                    entry_group_state_changed)
153
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
154
 
                     service.name, service.type)
155
 
        group.AddService(
156
 
                self.interface,         # interface
157
 
                avahi.PROTO_INET6,      # protocol
158
 
                dbus.UInt32(0),         # flags
159
 
                self.name, self.type,
160
 
                self.domain, self.host,
161
 
                dbus.UInt16(self.port),
162
 
                avahi.string_array_to_txt_array(self.TXT))
163
 
        group.Commit()
164
 
 
 
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
165
89
# From the Avahi example code:
166
 
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
167
99
# End of Avahi example code
168
100
 
169
101
 
175
107
                 uniquely identify the client
176
108
    secret:    bytestring; sent verbatim (over TLS) to client
177
109
    fqdn:      string (FQDN); available for use by the checker command
178
 
    created:   datetime.datetime(); object creation, not client host
179
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
180
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
181
 
                                     until this client is invalid
 
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
182
114
    interval:  datetime.timedelta(); How often to start a new checker
183
115
    stop_hook: If set, called by stop() as stop_hook(self)
184
116
    checker:   subprocess.Popen(); a running checker process used
185
117
                                   to see if the client lives.
186
 
                                   'None' if no process is running.
 
118
                                   Is None if no process is running.
187
119
    checker_initiator_tag: a gobject event source tag, or None
188
120
    stop_initiator_tag:    - '' -
189
121
    checker_callback_tag:  - '' -
190
122
    checker_command: string; External command which is run to check if
191
 
                     client lives.  %() expansions are done at
 
123
                     client lives.  %()s expansions are done at
192
124
                     runtime with vars(self) as dict, so that for
193
125
                     instance %(name)s can be used in the command.
194
126
    Private attibutes:
195
127
    _timeout: Real variable for 'timeout'
196
128
    _interval: Real variable for 'interval'
197
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
129
    _timeout_milliseconds: Used by gobject.timeout_add()
198
130
    _interval_milliseconds: - '' -
199
131
    """
200
132
    def _set_timeout(self, timeout):
220
152
    interval = property(lambda self: self._interval,
221
153
                        _set_interval)
222
154
    del _set_interval
223
 
    def __init__(self, name = None, stop_hook=None, config={}):
224
 
        """Note: the 'checker' key in 'config' sets the
225
 
        'checker_command' attribute and *not* the 'checker'
226
 
        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.."""
227
160
        self.name = name
228
161
        logger.debug(u"Creating client %r", self.name)
229
 
        # Uppercase and remove spaces from fingerprint for later
230
 
        # comparison purposes with return value from the fingerprint()
231
 
        # function
232
 
        self.fingerprint = config["fingerprint"].upper()\
233
 
                           .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"")
234
166
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
235
 
        if "secret" in config:
236
 
            self.secret = config["secret"].decode(u"base64")
237
 
        elif "secfile" in config:
238
 
            sf = open(config["secfile"])
 
167
        if secret:
 
168
            self.secret = secret.decode(u"base64")
 
169
        elif secfile:
 
170
            sf = open(secfile)
239
171
            self.secret = sf.read()
240
172
            sf.close()
241
173
        else:
242
 
            raise TypeError(u"No secret or secfile for client %s"
243
 
                            % self.name)
244
 
        self.fqdn = config.get("fqdn", "")
 
174
            raise RuntimeError(u"No secret or secfile for client %s"
 
175
                               % self.name)
 
176
        self.fqdn = fqdn                # string
245
177
        self.created = datetime.datetime.now()
246
 
        self.last_checked_ok = None
247
 
        self.timeout = string_to_delta(config["timeout"])
248
 
        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)
249
181
        self.stop_hook = stop_hook
250
182
        self.checker = None
251
183
        self.checker_initiator_tag = None
252
184
        self.stop_initiator_tag = None
253
185
        self.checker_callback_tag = None
254
 
        self.check_command = config["checker"]
 
186
        self.check_command = checker
255
187
    def start(self):
256
188
        """Start this client's checker and timeout hooks"""
257
189
        # Schedule a new checker to be started an 'interval' from now,
267
199
                                   self.stop)
268
200
    def stop(self):
269
201
        """Stop this client.
270
 
        The possibility that a client might be restarted is left open,
271
 
        but not currently used."""
 
202
        The possibility that this client might be restarted is left
 
203
        open, but not currently used."""
272
204
        # If this client doesn't have a secret, it is already stopped.
273
205
        if self.secret:
274
 
            logger.info(u"Stopping client %s", self.name)
 
206
            logger.debug(u"Stopping client %s", self.name)
275
207
            self.secret = None
276
208
        else:
277
209
            return False
278
 
        if getattr(self, "stop_initiator_tag", False):
 
210
        if hasattr(self, "stop_initiator_tag") \
 
211
               and self.stop_initiator_tag:
279
212
            gobject.source_remove(self.stop_initiator_tag)
280
213
            self.stop_initiator_tag = None
281
 
        if getattr(self, "checker_initiator_tag", False):
 
214
        if hasattr(self, "checker_initiator_tag") \
 
215
               and self.checker_initiator_tag:
282
216
            gobject.source_remove(self.checker_initiator_tag)
283
217
            self.checker_initiator_tag = None
284
218
        self.stop_checker()
296
230
        self.checker = None
297
231
        if os.WIFEXITED(condition) \
298
232
               and (os.WEXITSTATUS(condition) == 0):
299
 
            logger.info(u"Checker for %(name)s succeeded",
300
 
                        vars(self))
301
 
            self.last_checked_ok = now
 
233
            logger.debug(u"Checker for %(name)s succeeded",
 
234
                         vars(self))
 
235
            self.last_seen = now
302
236
            gobject.source_remove(self.stop_initiator_tag)
303
237
            self.stop_initiator_tag = gobject.timeout_add\
304
238
                                      (self._timeout_milliseconds,
307
241
            logger.warning(u"Checker for %(name)s crashed?",
308
242
                           vars(self))
309
243
        else:
310
 
            logger.info(u"Checker for %(name)s failed",
311
 
                        vars(self))
 
244
            logger.debug(u"Checker for %(name)s failed",
 
245
                         vars(self))
312
246
    def start_checker(self):
313
247
        """Start a new checker subprocess if one is not running.
314
248
        If a checker already exists, leave it running and do
323
257
        # is as it should be.
324
258
        if self.checker is None:
325
259
            try:
326
 
                # In case check_command has exactly one % operator
327
260
                command = self.check_command % self.fqdn
328
261
            except TypeError:
329
 
                # Escape attributes for the shell
330
262
                escaped_attrs = dict((key, re.escape(str(val)))
331
263
                                     for key, val in
332
264
                                     vars(self).iteritems())
333
265
                try:
334
266
                    command = self.check_command % escaped_attrs
335
267
                except TypeError, error:
336
 
                    logger.error(u'Could not format string "%s":'
337
 
                                 u' %s', self.check_command, error)
 
268
                    logger.critical(u'Could not format string "%s":'
 
269
                                    u' %s', self.check_command, error)
338
270
                    return True # Try again later
339
271
            try:
340
 
                logger.info(u"Starting checker %r for %s",
341
 
                            command, self.name)
342
 
                self.checker = subprocess.Popen(command,
343
 
                                                close_fds=True,
344
 
                                                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="/")
345
278
                self.checker_callback_tag = gobject.child_watch_add\
346
279
                                            (self.checker.pid,
347
280
                                             self.checker_callback)
355
288
        if self.checker_callback_tag:
356
289
            gobject.source_remove(self.checker_callback_tag)
357
290
            self.checker_callback_tag = None
358
 
        if getattr(self, "checker", None) is None:
 
291
        if not hasattr(self, "checker") or self.checker is None:
359
292
            return
360
293
        logger.debug("Stopping checker for %(name)s", vars(self))
361
294
        try:
364
297
            #if self.checker.poll() is None:
365
298
            #    os.kill(self.checker.pid, signal.SIGKILL)
366
299
        except OSError, error:
367
 
            if error.errno != errno.ESRCH: # No such process
 
300
            if error.errno != errno.ESRCH:
368
301
                raise
369
302
        self.checker = None
370
 
    def still_valid(self):
 
303
    def still_valid(self, now=None):
371
304
        """Has the timeout not yet passed for this client?"""
372
 
        now = datetime.datetime.now()
373
 
        if self.last_checked_ok is None:
 
305
        if now is None:
 
306
            now = datetime.datetime.now()
 
307
        if self.last_seen is None:
374
308
            return now < (self.created + self.timeout)
375
309
        else:
376
 
            return now < (self.last_checked_ok + self.timeout)
 
310
            return now < (self.last_seen + self.timeout)
377
311
 
378
312
 
379
313
def peer_certificate(session):
395
329
 
396
330
def fingerprint(openpgp):
397
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))
398
336
    # New GnuTLS "datum" with the OpenPGP public key
399
337
    datum = gnutls.library.types.gnutls_datum_t\
400
338
        (ctypes.cast(ctypes.c_char_p(openpgp),
401
339
                     ctypes.POINTER(ctypes.c_ubyte)),
402
340
         ctypes.c_uint(len(openpgp)))
403
 
    # New empty GnuTLS certificate
404
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
405
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
406
 
        (ctypes.byref(crt))
407
341
    # Import the OpenPGP public key into the certificate
408
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
409
 
                    (crt, ctypes.byref(datum),
410
 
                     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)
411
346
    # New buffer for the fingerprint
412
347
    buffer = ctypes.create_string_buffer(20)
413
348
    buffer_length = ctypes.c_size_t()
429
364
    Note: This will run in its own forked process."""
430
365
    
431
366
    def handle(self):
432
 
        logger.info(u"TCP connection from: %s",
 
367
        logger.debug(u"TCP connection from: %s",
433
368
                     unicode(self.client_address))
434
 
        session = gnutls.connection.ClientSession\
435
 
                  (self.request, gnutls.connection.X509Credentials())
436
 
        
437
 
        line = self.request.makefile().readline()
438
 
        logger.debug(u"Protocol version: %r", line)
439
 
        try:
440
 
            if int(line.strip().split()[0]) > 1:
441
 
                raise RuntimeError
442
 
        except (ValueError, IndexError, RuntimeError), error:
443
 
            logger.error(u"Unknown protocol version: %s", error)
444
 
            return
445
 
        
446
 
        # Note: gnutls.connection.X509Credentials is really a generic
447
 
        # GnuTLS certificate credentials object so long as no X.509
448
 
        # keys are added to it.  Therefore, we can use it here despite
449
 
        # using OpenPGP certificates.
 
369
        session = gnutls.connection.ClientSession(self.request,
 
370
                                                  gnutls.connection.\
 
371
                                                  X509Credentials())
450
372
        
451
373
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
452
374
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
453
375
        #                "+DHE-DSS"))
454
 
        priority = "NORMAL"             # Fallback default, since this
455
 
                                        # MUST be set.
456
 
        if self.server.settings["priority"]:
457
 
            priority = self.server.settings["priority"]
 
376
        priority = "NORMAL"
 
377
        if self.server.options.priority:
 
378
            priority = self.server.options.priority
458
379
        gnutls.library.functions.gnutls_priority_set_direct\
459
380
            (session._c_object, priority, None);
460
381
        
461
382
        try:
462
383
            session.handshake()
463
384
        except gnutls.errors.GNUTLSError, error:
464
 
            logger.warning(u"Handshake failed: %s", error)
 
385
            logger.debug(u"Handshake failed: %s", error)
465
386
            # Do not run session.bye() here: the session is not
466
387
            # established.  Just abandon the request.
467
388
            return
468
389
        try:
469
390
            fpr = fingerprint(peer_certificate(session))
470
391
        except (TypeError, gnutls.errors.GNUTLSError), error:
471
 
            logger.warning(u"Bad certificate: %s", error)
 
392
            logger.debug(u"Bad certificate: %s", error)
472
393
            session.bye()
473
394
            return
474
395
        logger.debug(u"Fingerprint: %s", fpr)
477
398
            if c.fingerprint == fpr:
478
399
                client = c
479
400
                break
480
 
        if not client:
481
 
            logger.warning(u"Client not found for fingerprint: %s",
482
 
                           fpr)
483
 
            session.bye()
484
 
            return
485
401
        # Have to check if client.still_valid(), since it is possible
486
402
        # that the client timed out while establishing the GnuTLS
487
403
        # session.
488
 
        if not client.still_valid():
489
 
            logger.warning(u"Client %(name)s is invalid",
490
 
                           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)
491
411
            session.bye()
492
412
            return
493
413
        sent_size = 0
503
423
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
504
424
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
505
425
    Attributes:
506
 
        settings:       Server settings
 
426
        options:        Command line options
507
427
        clients:        Set() of Client objects
508
428
    """
509
429
    address_family = socket.AF_INET6
510
430
    def __init__(self, *args, **kwargs):
511
 
        if "settings" in kwargs:
512
 
            self.settings = kwargs["settings"]
513
 
            del kwargs["settings"]
 
431
        if "options" in kwargs:
 
432
            self.options = kwargs["options"]
 
433
            del kwargs["options"]
514
434
        if "clients" in kwargs:
515
435
            self.clients = kwargs["clients"]
516
436
            del kwargs["clients"]
519
439
        """This overrides the normal server_bind() function
520
440
        to bind to an interface if one was specified, and also NOT to
521
441
        bind to an address or port if they were not specified."""
522
 
        if self.settings["interface"]:
523
 
            # 25 is from /usr/include/asm-i486/socket.h
524
 
            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
525
446
            try:
526
447
                self.socket.setsockopt(socket.SOL_SOCKET,
527
 
                                       SO_BINDTODEVICE,
528
 
                                       self.settings["interface"])
 
448
                                       socket.SO_BINDTODEVICE,
 
449
                                       self.options.interface)
529
450
            except socket.error, error:
530
451
                if error[0] == errno.EPERM:
531
 
                    logger.error(u"No permission to"
532
 
                                 u" bind to interface %s",
533
 
                                 self.settings["interface"])
 
452
                    logger.warning(u"No permission to"
 
453
                                   u" bind to interface %s",
 
454
                                   self.options.interface)
534
455
                else:
535
456
                    raise error
536
457
        # Only bind(2) the socket if we really need to.
579
500
    return delta
580
501
 
581
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
 
582
536
def server_state_changed(state):
583
537
    """Derived from the Avahi example code"""
584
538
    if state == avahi.SERVER_COLLISION:
585
 
        logger.error(u"Server name collision")
586
 
        service.remove()
 
539
        logger.warning(u"Server name collision")
 
540
        remove_service()
587
541
    elif state == avahi.SERVER_RUNNING:
588
 
        service.add()
 
542
        add_service()
589
543
 
590
544
 
591
545
def entry_group_state_changed(state, error):
592
546
    """Derived from the Avahi example code"""
 
547
    global serviceName, server, rename_count
 
548
    
593
549
    logger.debug(u"state change: %i", state)
594
550
    
595
551
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
596
552
        logger.debug(u"Service established.")
597
553
    elif state == avahi.ENTRY_GROUP_COLLISION:
598
 
        logger.warning(u"Service name collision.")
599
 
        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)
600
567
    elif state == avahi.ENTRY_GROUP_FAILURE:
601
 
        logger.critical(u"Error in group state changed %s",
602
 
                        unicode(error))
603
 
        raise AvahiGroupError("State changed: %s", str(error))
 
568
        logger.error(u"Error in group state changed %s",
 
569
                     unicode(error))
 
570
        killme(1)
 
571
 
604
572
 
605
573
def if_nametoindex(interface):
606
 
    """Call the C function if_nametoindex(), or equivalent"""
607
 
    global if_nametoindex
 
574
    """Call the C function if_nametoindex()"""
608
575
    try:
609
 
        if "ctypes.util" not in sys.modules:
610
 
            import ctypes.util
611
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
612
 
            (ctypes.util.find_library("c")).if_nametoindex
 
576
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
577
        return libc.if_nametoindex(interface)
613
578
    except (OSError, AttributeError):
614
579
        if "struct" not in sys.modules:
615
580
            import struct
616
581
        if "fcntl" not in sys.modules:
617
582
            import fcntl
618
 
        def if_nametoindex(interface):
619
 
            "Get an interface index the hard way, i.e. using fcntl()"
620
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
621
 
            s = socket.socket()
622
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
623
 
                                struct.pack("16s16x", interface))
624
 
            s.close()
625
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
626
 
            return interface_index
627
 
    return if_nametoindex(interface)
 
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
628
590
 
629
591
 
630
592
def daemon(nochdir, noclose):
637
599
        os.chdir("/")
638
600
    if not noclose:
639
601
        # Close all standard open file descriptors
640
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
602
        null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
641
603
        if not stat.S_ISCHR(os.fstat(null).st_mode):
642
604
            raise OSError(errno.ENODEV,
643
605
                          "/dev/null not a character device")
648
610
            os.close(null)
649
611
 
650
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
 
651
622
def main():
 
623
    global exitstatus
 
624
    exitstatus = 0
652
625
    global main_loop_started
653
626
    main_loop_started = False
654
627
    
655
628
    parser = OptionParser()
656
629
    parser.add_option("-i", "--interface", type="string",
657
 
                      metavar="IF", help="Bind to interface IF")
658
 
    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,
659
633
                      help="Address to listen for requests on")
660
 
    parser.add_option("-p", "--port", type="int",
 
634
    parser.add_option("-p", "--port", type="int", default=None,
661
635
                      help="Port number to receive requests on")
662
636
    parser.add_option("--check", action="store_true", default=False,
663
637
                      help="Run self-test")
664
638
    parser.add_option("--debug", action="store_true", default=False,
665
 
                      help="Debug mode; run in foreground and log to"
666
 
                      " terminal")
667
 
    parser.add_option("--priority", type="string", help="GnuTLS"
668
 
                      " priority string (see GnuTLS documentation)")
669
 
    parser.add_option("--servicename", type="string", metavar="NAME",
670
 
                      help="Zeroconf service name")
671
 
    parser.add_option("--configdir", type="string",
672
 
                      default="/etc/mandos", metavar="DIR",
673
 
                      help="Directory to search for configuration"
674
 
                      " files")
 
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")
675
646
    (options, args) = parser.parse_args()
676
647
    
677
648
    if options.check:
679
650
        doctest.testmod()
680
651
        sys.exit()
681
652
    
682
 
    # Default values for config file for server-global settings
683
 
    server_defaults = { "interface": "",
684
 
                        "address": "",
685
 
                        "port": "",
686
 
                        "debug": "False",
687
 
                        "priority":
688
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
689
 
                        "servicename": "Mandos",
690
 
                        }
691
 
    
692
 
    # Parse config file for server-global settings
693
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
694
 
    del server_defaults
695
 
    server_config.read(os.path.join(options.configdir, "server.conf"))
696
 
    server_section = "server"
697
 
    # Convert the SafeConfigParser object to a dict
698
 
    server_settings = dict(server_config.items(server_section))
699
 
    # Use getboolean on the boolean config option
700
 
    server_settings["debug"] = server_config.getboolean\
701
 
                               (server_section, "debug")
702
 
    del server_config
703
 
    
704
 
    # Override the settings from the config file with command line
705
 
    # options, if set.
706
 
    for option in ("interface", "address", "port", "debug",
707
 
                   "priority", "servicename", "configdir"):
708
 
        value = getattr(options, option)
709
 
        if value is not None:
710
 
            server_settings[option] = value
711
 
    del options
712
 
    # Now we have our good server settings in "server_settings"
713
 
    
714
 
    # Parse config file with clients
715
 
    client_defaults = { "timeout": "1h",
716
 
                        "interval": "5m",
717
 
                        "checker": "fping -q -- %%(fqdn)s",
718
 
                        }
719
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
720
 
    client_config.read(os.path.join(server_settings["configdir"],
721
 
                                    "clients.conf"))
722
 
    
723
 
    global service
724
 
    service = AvahiService(name = server_settings["servicename"],
725
 
                           type = "_mandos._tcp", );
726
 
    if server_settings["interface"]:
727
 
        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;
728
664
    
729
665
    global main_loop
730
666
    global bus
738
674
            avahi.DBUS_INTERFACE_SERVER )
739
675
    # End of Avahi example code
740
676
    
741
 
    debug = server_settings["debug"]
 
677
    debug = options.debug
742
678
    
743
679
    if debug:
744
680
        console = logging.StreamHandler()
752
688
    def remove_from_clients(client):
753
689
        clients.remove(client)
754
690
        if not clients:
755
 
            logger.critical(u"No clients left, exiting")
756
 
            sys.exit()
 
691
            logger.debug(u"No clients left, exiting")
 
692
            killme()
757
693
    
758
 
    clients.update(Set(Client(name = section,
 
694
    clients.update(Set(Client(name=section,
759
695
                              stop_hook = remove_from_clients,
760
 
                              config
761
 
                              = dict(client_config.items(section)))
 
696
                              **(dict(client_config\
 
697
                                      .items(section))))
762
698
                       for section in client_config.sections()))
763
699
    
764
700
    if not debug:
782
718
    
783
719
    if not debug:
784
720
        signal.signal(signal.SIGINT, signal.SIG_IGN)
785
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
786
 
    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())
787
723
    
788
724
    for client in clients:
789
725
        client.start()
790
726
    
791
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
792
 
                                 server_settings["port"]),
 
727
    tcp_server = IPv6_TCPServer((options.address, options.port),
793
728
                                tcp_handler,
794
 
                                settings=server_settings,
 
729
                                options=options,
795
730
                                clients=clients)
796
 
    # Find out what port we got
797
 
    service.port = tcp_server.socket.getsockname()[1]
798
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
799
 
                u" scope_id %d" % tcp_server.socket.getsockname())
800
 
    
801
 
    #service.interface = tcp_server.socket.getsockname()[3]
802
 
    
803
 
    try:
804
 
        # From the Avahi example code
805
 
        server.connect_to_signal("StateChanged", server_state_changed)
806
 
        try:
807
 
            server_state_changed(server.GetState())
808
 
        except dbus.exceptions.DBusException, error:
809
 
            logger.critical(u"DBusException: %s", error)
810
 
            sys.exit(1)
811
 
        # End of Avahi example code
812
 
        
813
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
814
 
                             lambda *args, **kwargs:
815
 
                             tcp_server.handle_request\
816
 
                             (*args[2:], **kwargs) or True)
817
 
        
 
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:
818
754
        logger.debug("Starting main loop")
819
755
        main_loop_started = True
820
756
        main_loop.run()
821
 
    except AvahiError, error:
822
 
        logger.critical(u"AvahiError: %s" + unicode(error))
823
 
        sys.exit(1)
824
757
    except KeyboardInterrupt:
825
758
        if debug:
826
759
            print
 
760
    
 
761
    sys.exit(exitstatus)
827
762
 
828
763
if __name__ == '__main__':
829
764
    main()