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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
 
        self.max_renames = max_renames
123
 
    def rename(self):
124
 
        """Derived from the Avahi example code"""
125
 
        if self.rename_count >= self.max_renames:
126
 
            logger.critical(u"No suitable service name found after %i"
127
 
                            u" retries, exiting.", rename_count)
128
 
            raise AvahiServiceError("Too many renames")
129
 
        self.name = server.GetAlternativeServiceName(self.name)
130
 
        logger.info(u"Changing name to %r ...", str(self.name))
131
 
        syslogger.setFormatter(logging.Formatter\
132
 
                               ('Mandos (%s): %%(levelname)s:'
133
 
                               ' %%(message)s' % self.name))
134
 
        self.remove()
135
 
        self.add()
136
 
        self.rename_count += 1
137
 
    def remove(self):
138
 
        """Derived from the Avahi example code"""
139
 
        if group is not None:
140
 
            group.Reset()
141
 
    def add(self):
142
 
        """Derived from the Avahi example code"""
143
 
        global group
144
 
        if group is None:
145
 
            group = dbus.Interface\
146
 
                    (bus.get_object(avahi.DBUS_NAME,
147
 
                                    server.EntryGroupNew()),
148
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
149
 
            group.connect_to_signal('StateChanged',
150
 
                                    entry_group_state_changed)
151
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
152
 
                     service.name, service.type)
153
 
        group.AddService(
154
 
                self.interface,         # interface
155
 
                avahi.PROTO_INET6,      # protocol
156
 
                dbus.UInt32(0),         # flags
157
 
                self.name, self.type,
158
 
                self.domain, self.host,
159
 
                dbus.UInt16(self.port),
160
 
                avahi.string_array_to_txt_array(self.TXT))
161
 
        group.Commit()
162
 
 
 
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
163
89
# From the Avahi example code:
164
 
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
165
99
# End of Avahi example code
166
100
 
167
101
 
172
106
    fingerprint: string (40 or 32 hexadecimal digits); used to
173
107
                 uniquely identify the client
174
108
    secret:    bytestring; sent verbatim (over TLS) to client
175
 
    host:      string; available for use by the checker command
176
 
    created:   datetime.datetime(); object creation, not client host
177
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
178
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
179
 
                                     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
180
114
    interval:  datetime.timedelta(); How often to start a new checker
181
115
    stop_hook: If set, called by stop() as stop_hook(self)
182
116
    checker:   subprocess.Popen(); a running checker process used
183
117
                                   to see if the client lives.
184
 
                                   'None' if no process is running.
 
118
                                   Is None if no process is running.
185
119
    checker_initiator_tag: a gobject event source tag, or None
186
120
    stop_initiator_tag:    - '' -
187
121
    checker_callback_tag:  - '' -
188
122
    checker_command: string; External command which is run to check if
189
 
                     client lives.  %() expansions are done at
 
123
                     client lives.  %()s expansions are done at
190
124
                     runtime with vars(self) as dict, so that for
191
125
                     instance %(name)s can be used in the command.
192
126
    Private attibutes:
193
127
    _timeout: Real variable for 'timeout'
194
128
    _interval: Real variable for 'interval'
195
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
129
    _timeout_milliseconds: Used by gobject.timeout_add()
196
130
    _interval_milliseconds: - '' -
197
131
    """
198
132
    def _set_timeout(self, timeout):
218
152
    interval = property(lambda self: self._interval,
219
153
                        _set_interval)
220
154
    del _set_interval
221
 
    def __init__(self, name = None, stop_hook=None, config={}):
222
 
        """Note: the 'checker' key in 'config' sets the
223
 
        'checker_command' attribute and *not* the 'checker'
224
 
        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.."""
225
160
        self.name = name
226
161
        logger.debug(u"Creating client %r", self.name)
227
 
        # Uppercase and remove spaces from fingerprint for later
228
 
        # comparison purposes with return value from the fingerprint()
229
 
        # function
230
 
        self.fingerprint = config["fingerprint"].upper()\
231
 
                           .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"")
232
166
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
233
 
        if "secret" in config:
234
 
            self.secret = config["secret"].decode(u"base64")
235
 
        elif "secfile" in config:
236
 
            sf = open(config["secfile"])
 
167
        if secret:
 
168
            self.secret = secret.decode(u"base64")
 
169
        elif secfile:
 
170
            sf = open(secfile)
237
171
            self.secret = sf.read()
238
172
            sf.close()
239
173
        else:
240
 
            raise TypeError(u"No secret or secfile for client %s"
241
 
                            % self.name)
242
 
        self.host = config.get("host", "")
 
174
            raise RuntimeError(u"No secret or secfile for client %s"
 
175
                               % self.name)
 
176
        self.fqdn = fqdn                # string
243
177
        self.created = datetime.datetime.now()
244
 
        self.last_checked_ok = None
245
 
        self.timeout = string_to_delta(config["timeout"])
246
 
        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)
247
181
        self.stop_hook = stop_hook
248
182
        self.checker = None
249
183
        self.checker_initiator_tag = None
250
184
        self.stop_initiator_tag = None
251
185
        self.checker_callback_tag = None
252
 
        self.check_command = config["checker"]
 
186
        self.check_command = checker
253
187
    def start(self):
254
188
        """Start this client's checker and timeout hooks"""
255
189
        # Schedule a new checker to be started an 'interval' from now,
265
199
                                   self.stop)
266
200
    def stop(self):
267
201
        """Stop this client.
268
 
        The possibility that a client might be restarted is left open,
269
 
        but not currently used."""
 
202
        The possibility that this client might be restarted is left
 
203
        open, but not currently used."""
270
204
        # If this client doesn't have a secret, it is already stopped.
271
 
        if hasattr(self, "secret") and self.secret:
272
 
            logger.info(u"Stopping client %s", self.name)
 
205
        if self.secret:
 
206
            logger.debug(u"Stopping client %s", self.name)
273
207
            self.secret = None
274
208
        else:
275
209
            return False
276
 
        if getattr(self, "stop_initiator_tag", False):
 
210
        if hasattr(self, "stop_initiator_tag") \
 
211
               and self.stop_initiator_tag:
277
212
            gobject.source_remove(self.stop_initiator_tag)
278
213
            self.stop_initiator_tag = None
279
 
        if getattr(self, "checker_initiator_tag", False):
 
214
        if hasattr(self, "checker_initiator_tag") \
 
215
               and self.checker_initiator_tag:
280
216
            gobject.source_remove(self.checker_initiator_tag)
281
217
            self.checker_initiator_tag = None
282
218
        self.stop_checker()
294
230
        self.checker = None
295
231
        if os.WIFEXITED(condition) \
296
232
               and (os.WEXITSTATUS(condition) == 0):
297
 
            logger.info(u"Checker for %(name)s succeeded",
298
 
                        vars(self))
299
 
            self.last_checked_ok = now
 
233
            logger.debug(u"Checker for %(name)s succeeded",
 
234
                         vars(self))
 
235
            self.last_seen = now
300
236
            gobject.source_remove(self.stop_initiator_tag)
301
237
            self.stop_initiator_tag = gobject.timeout_add\
302
238
                                      (self._timeout_milliseconds,
305
241
            logger.warning(u"Checker for %(name)s crashed?",
306
242
                           vars(self))
307
243
        else:
308
 
            logger.info(u"Checker for %(name)s failed",
309
 
                        vars(self))
 
244
            logger.debug(u"Checker for %(name)s failed",
 
245
                         vars(self))
310
246
    def start_checker(self):
311
247
        """Start a new checker subprocess if one is not running.
312
248
        If a checker already exists, leave it running and do
321
257
        # is as it should be.
322
258
        if self.checker is None:
323
259
            try:
324
 
                # In case check_command has exactly one % operator
325
 
                command = self.check_command % self.host
 
260
                command = self.check_command % self.fqdn
326
261
            except TypeError:
327
 
                # Escape attributes for the shell
328
262
                escaped_attrs = dict((key, re.escape(str(val)))
329
263
                                     for key, val in
330
264
                                     vars(self).iteritems())
331
265
                try:
332
266
                    command = self.check_command % escaped_attrs
333
267
                except TypeError, error:
334
 
                    logger.error(u'Could not format string "%s":'
335
 
                                 u' %s', self.check_command, error)
 
268
                    logger.critical(u'Could not format string "%s":'
 
269
                                    u' %s', self.check_command, error)
336
270
                    return True # Try again later
337
271
            try:
338
 
                logger.info(u"Starting checker %r for %s",
339
 
                            command, self.name)
340
 
                self.checker = subprocess.Popen(command,
341
 
                                                close_fds=True,
342
 
                                                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="/")
343
278
                self.checker_callback_tag = gobject.child_watch_add\
344
279
                                            (self.checker.pid,
345
280
                                             self.checker_callback)
353
288
        if self.checker_callback_tag:
354
289
            gobject.source_remove(self.checker_callback_tag)
355
290
            self.checker_callback_tag = None
356
 
        if getattr(self, "checker", None) is None:
 
291
        if not hasattr(self, "checker") or self.checker is None:
357
292
            return
358
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
293
        logger.debug("Stopping checker for %(name)s", vars(self))
359
294
        try:
360
295
            os.kill(self.checker.pid, signal.SIGTERM)
361
296
            #os.sleep(0.5)
362
297
            #if self.checker.poll() is None:
363
298
            #    os.kill(self.checker.pid, signal.SIGKILL)
364
299
        except OSError, error:
365
 
            if error.errno != errno.ESRCH: # No such process
 
300
            if error.errno != errno.ESRCH:
366
301
                raise
367
302
        self.checker = None
368
 
    def still_valid(self):
 
303
    def still_valid(self, now=None):
369
304
        """Has the timeout not yet passed for this client?"""
370
 
        now = datetime.datetime.now()
371
 
        if self.last_checked_ok is None:
 
305
        if now is None:
 
306
            now = datetime.datetime.now()
 
307
        if self.last_seen is None:
372
308
            return now < (self.created + self.timeout)
373
309
        else:
374
 
            return now < (self.last_checked_ok + self.timeout)
 
310
            return now < (self.last_seen + self.timeout)
375
311
 
376
312
 
377
313
def peer_certificate(session):
393
329
 
394
330
def fingerprint(openpgp):
395
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))
396
336
    # New GnuTLS "datum" with the OpenPGP public key
397
337
    datum = gnutls.library.types.gnutls_datum_t\
398
338
        (ctypes.cast(ctypes.c_char_p(openpgp),
399
339
                     ctypes.POINTER(ctypes.c_ubyte)),
400
340
         ctypes.c_uint(len(openpgp)))
401
 
    # New empty GnuTLS certificate
402
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
403
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
404
 
        (ctypes.byref(crt))
405
341
    # Import the OpenPGP public key into the certificate
406
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
407
 
                    (crt, ctypes.byref(datum),
408
 
                     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)
409
346
    # New buffer for the fingerprint
410
347
    buffer = ctypes.create_string_buffer(20)
411
348
    buffer_length = ctypes.c_size_t()
427
364
    Note: This will run in its own forked process."""
428
365
    
429
366
    def handle(self):
430
 
        logger.info(u"TCP connection from: %s",
 
367
        logger.debug(u"TCP connection from: %s",
431
368
                     unicode(self.client_address))
432
 
        session = gnutls.connection.ClientSession\
433
 
                  (self.request, gnutls.connection.X509Credentials())
434
 
        
435
 
        line = self.request.makefile().readline()
436
 
        logger.debug(u"Protocol version: %r", line)
437
 
        try:
438
 
            if int(line.strip().split()[0]) > 1:
439
 
                raise RuntimeError
440
 
        except (ValueError, IndexError, RuntimeError), error:
441
 
            logger.error(u"Unknown protocol version: %s", error)
442
 
            return
443
 
        
444
 
        # Note: gnutls.connection.X509Credentials is really a generic
445
 
        # GnuTLS certificate credentials object so long as no X.509
446
 
        # keys are added to it.  Therefore, we can use it here despite
447
 
        # using OpenPGP certificates.
 
369
        session = gnutls.connection.ClientSession(self.request,
 
370
                                                  gnutls.connection.\
 
371
                                                  X509Credentials())
448
372
        
449
373
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
450
374
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
451
375
        #                "+DHE-DSS"))
452
 
        priority = "NORMAL"             # Fallback default, since this
453
 
                                        # MUST be set.
454
 
        if self.server.settings["priority"]:
455
 
            priority = self.server.settings["priority"]
 
376
        priority = "NORMAL"
 
377
        if self.server.options.priority:
 
378
            priority = self.server.options.priority
456
379
        gnutls.library.functions.gnutls_priority_set_direct\
457
380
            (session._c_object, priority, None);
458
381
        
459
382
        try:
460
383
            session.handshake()
461
384
        except gnutls.errors.GNUTLSError, error:
462
 
            logger.warning(u"Handshake failed: %s", error)
 
385
            logger.debug(u"Handshake failed: %s", error)
463
386
            # Do not run session.bye() here: the session is not
464
387
            # established.  Just abandon the request.
465
388
            return
466
389
        try:
467
390
            fpr = fingerprint(peer_certificate(session))
468
391
        except (TypeError, gnutls.errors.GNUTLSError), error:
469
 
            logger.warning(u"Bad certificate: %s", error)
 
392
            logger.debug(u"Bad certificate: %s", error)
470
393
            session.bye()
471
394
            return
472
395
        logger.debug(u"Fingerprint: %s", fpr)
475
398
            if c.fingerprint == fpr:
476
399
                client = c
477
400
                break
478
 
        if not client:
479
 
            logger.warning(u"Client not found for fingerprint: %s",
480
 
                           fpr)
481
 
            session.bye()
482
 
            return
483
401
        # Have to check if client.still_valid(), since it is possible
484
402
        # that the client timed out while establishing the GnuTLS
485
403
        # session.
486
 
        if not client.still_valid():
487
 
            logger.warning(u"Client %(name)s is invalid",
488
 
                           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)
489
411
            session.bye()
490
412
            return
491
413
        sent_size = 0
501
423
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
502
424
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
503
425
    Attributes:
504
 
        settings:       Server settings
 
426
        options:        Command line options
505
427
        clients:        Set() of Client objects
506
428
    """
507
429
    address_family = socket.AF_INET6
508
430
    def __init__(self, *args, **kwargs):
509
 
        if "settings" in kwargs:
510
 
            self.settings = kwargs["settings"]
511
 
            del kwargs["settings"]
 
431
        if "options" in kwargs:
 
432
            self.options = kwargs["options"]
 
433
            del kwargs["options"]
512
434
        if "clients" in kwargs:
513
435
            self.clients = kwargs["clients"]
514
436
            del kwargs["clients"]
517
439
        """This overrides the normal server_bind() function
518
440
        to bind to an interface if one was specified, and also NOT to
519
441
        bind to an address or port if they were not specified."""
520
 
        if self.settings["interface"]:
521
 
            # 25 is from /usr/include/asm-i486/socket.h
522
 
            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
523
446
            try:
524
447
                self.socket.setsockopt(socket.SOL_SOCKET,
525
 
                                       SO_BINDTODEVICE,
526
 
                                       self.settings["interface"])
 
448
                                       socket.SO_BINDTODEVICE,
 
449
                                       self.options.interface)
527
450
            except socket.error, error:
528
451
                if error[0] == errno.EPERM:
529
 
                    logger.error(u"No permission to"
530
 
                                 u" bind to interface %s",
531
 
                                 self.settings["interface"])
 
452
                    logger.warning(u"No permission to"
 
453
                                   u" bind to interface %s",
 
454
                                   self.options.interface)
532
455
                else:
533
456
                    raise error
534
457
        # Only bind(2) the socket if we really need to.
537
460
                in6addr_any = "::"
538
461
                self.server_address = (in6addr_any,
539
462
                                       self.server_address[1])
540
 
            elif not self.server_address[1]:
 
463
            elif self.server_address[1] is None:
541
464
                self.server_address = (self.server_address[0],
542
465
                                       0)
543
 
#                 if self.settings["interface"]:
544
 
#                     self.server_address = (self.server_address[0],
545
 
#                                            0, # port
546
 
#                                            0, # flowinfo
547
 
#                                            if_nametoindex
548
 
#                                            (self.settings
549
 
#                                             ["interface"]))
550
466
            return super(type(self), self).server_bind()
551
467
 
552
468
 
584
500
    return delta
585
501
 
586
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
 
587
536
def server_state_changed(state):
588
537
    """Derived from the Avahi example code"""
589
538
    if state == avahi.SERVER_COLLISION:
590
 
        logger.error(u"Server name collision")
591
 
        service.remove()
 
539
        logger.warning(u"Server name collision")
 
540
        remove_service()
592
541
    elif state == avahi.SERVER_RUNNING:
593
 
        service.add()
 
542
        add_service()
594
543
 
595
544
 
596
545
def entry_group_state_changed(state, error):
597
546
    """Derived from the Avahi example code"""
 
547
    global serviceName, server, rename_count
 
548
    
598
549
    logger.debug(u"state change: %i", state)
599
550
    
600
551
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
601
552
        logger.debug(u"Service established.")
602
553
    elif state == avahi.ENTRY_GROUP_COLLISION:
603
 
        logger.warning(u"Service name collision.")
604
 
        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)
605
567
    elif state == avahi.ENTRY_GROUP_FAILURE:
606
 
        logger.critical(u"Error in group state changed %s",
607
 
                        unicode(error))
608
 
        raise AvahiGroupError("State changed: %s", str(error))
 
568
        logger.error(u"Error in group state changed %s",
 
569
                     unicode(error))
 
570
        killme(1)
 
571
 
609
572
 
610
573
def if_nametoindex(interface):
611
 
    """Call the C function if_nametoindex(), or equivalent"""
612
 
    global if_nametoindex
 
574
    """Call the C function if_nametoindex()"""
613
575
    try:
614
 
        if "ctypes.util" not in sys.modules:
615
 
            import ctypes.util
616
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
617
 
            (ctypes.util.find_library("c")).if_nametoindex
 
576
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
577
        return libc.if_nametoindex(interface)
618
578
    except (OSError, AttributeError):
619
579
        if "struct" not in sys.modules:
620
580
            import struct
621
581
        if "fcntl" not in sys.modules:
622
582
            import fcntl
623
 
        def if_nametoindex(interface):
624
 
            "Get an interface index the hard way, i.e. using fcntl()"
625
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
626
 
            s = socket.socket()
627
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
628
 
                                struct.pack("16s16x", interface))
629
 
            s.close()
630
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
631
 
            return interface_index
632
 
    return if_nametoindex(interface)
633
 
 
634
 
 
635
 
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):
636
593
    """See daemon(3).  Standard BSD Unix function.
637
594
    This should really exist as os.daemon, but it doesn't (yet)."""
638
595
    if os.fork():
640
597
    os.setsid()
641
598
    if not nochdir:
642
599
        os.chdir("/")
643
 
    if os.fork():
644
 
        sys.exit()
645
600
    if not noclose:
646
601
        # Close all standard open file descriptors
647
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
602
        null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
648
603
        if not stat.S_ISCHR(os.fstat(null).st_mode):
649
604
            raise OSError(errno.ENODEV,
650
605
                          "/dev/null not a character device")
655
610
            os.close(null)
656
611
 
657
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
 
658
622
def main():
 
623
    global exitstatus
 
624
    exitstatus = 0
659
625
    global main_loop_started
660
626
    main_loop_started = False
661
627
    
662
 
    parser = OptionParser(version = "%%prog %s" % version)
 
628
    parser = OptionParser()
663
629
    parser.add_option("-i", "--interface", type="string",
664
 
                      metavar="IF", help="Bind to interface IF")
665
 
    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,
666
633
                      help="Address to listen for requests on")
667
 
    parser.add_option("-p", "--port", type="int",
 
634
    parser.add_option("-p", "--port", type="int", default=None,
668
635
                      help="Port number to receive requests on")
669
636
    parser.add_option("--check", action="store_true", default=False,
670
637
                      help="Run self-test")
671
 
    parser.add_option("--debug", action="store_true",
672
 
                      help="Debug mode; run in foreground and log to"
673
 
                      " terminal")
674
 
    parser.add_option("--priority", type="string", help="GnuTLS"
675
 
                      " priority string (see GnuTLS documentation)")
676
 
    parser.add_option("--servicename", type="string", metavar="NAME",
677
 
                      help="Zeroconf service name")
678
 
    parser.add_option("--configdir", type="string",
679
 
                      default="/etc/mandos", metavar="DIR",
680
 
                      help="Directory to search for configuration"
681
 
                      " 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")
682
646
    (options, args) = parser.parse_args()
683
647
    
684
648
    if options.check:
686
650
        doctest.testmod()
687
651
        sys.exit()
688
652
    
689
 
    # Default values for config file for server-global settings
690
 
    server_defaults = { "interface": "",
691
 
                        "address": "",
692
 
                        "port": "",
693
 
                        "debug": "False",
694
 
                        "priority":
695
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
696
 
                        "servicename": "Mandos",
697
 
                        }
698
 
    
699
 
    # Parse config file for server-global settings
700
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
701
 
    del server_defaults
702
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
703
 
    server_section = "server"
704
 
    # Convert the SafeConfigParser object to a dict
705
 
    server_settings = dict(server_config.items(server_section))
706
 
    # Use getboolean on the boolean config option
707
 
    server_settings["debug"] = server_config.getboolean\
708
 
                               (server_section, "debug")
709
 
    del server_config
710
 
    
711
 
    # Override the settings from the config file with command line
712
 
    # options, if set.
713
 
    for option in ("interface", "address", "port", "debug",
714
 
                   "priority", "servicename", "configdir"):
715
 
        value = getattr(options, option)
716
 
        if value is not None:
717
 
            server_settings[option] = value
718
 
    del options
719
 
    # Now we have our good server settings in "server_settings"
720
 
    
721
 
    debug = server_settings["debug"]
722
 
    
723
 
    if not debug:
724
 
        syslogger.setLevel(logging.WARNING)
725
 
        console.setLevel(logging.WARNING)
726
 
    
727
 
    if server_settings["servicename"] != "Mandos":
728
 
        syslogger.setFormatter(logging.Formatter\
729
 
                               ('Mandos (%s): %%(levelname)s:'
730
 
                                ' %%(message)s'
731
 
                                % server_settings["servicename"]))
732
 
    
733
 
    # Parse config file with clients
734
 
    client_defaults = { "timeout": "1h",
735
 
                        "interval": "5m",
736
 
                        "checker": "fping -q -- %%(host)s",
737
 
                        }
738
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
739
 
    client_config.read(os.path.join(server_settings["configdir"],
740
 
                                    "clients.conf"))
741
 
    
742
 
    global service
743
 
    service = AvahiService(name = server_settings["servicename"],
744
 
                           type = "_mandos._tcp", );
745
 
    if server_settings["interface"]:
746
 
        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;
747
664
    
748
665
    global main_loop
749
666
    global bus
757
674
            avahi.DBUS_INTERFACE_SERVER )
758
675
    # End of Avahi example code
759
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
    
760
687
    clients = Set()
761
688
    def remove_from_clients(client):
762
689
        clients.remove(client)
763
690
        if not clients:
764
 
            logger.critical(u"No clients left, exiting")
765
 
            sys.exit()
 
691
            logger.debug(u"No clients left, exiting")
 
692
            killme()
766
693
    
767
 
    clients.update(Set(Client(name = section,
 
694
    clients.update(Set(Client(name=section,
768
695
                              stop_hook = remove_from_clients,
769
 
                              config
770
 
                              = dict(client_config.items(section)))
 
696
                              **(dict(client_config\
 
697
                                      .items(section))))
771
698
                       for section in client_config.sections()))
772
 
    if not clients:
773
 
        logger.critical(u"No clients defined")
774
 
        sys.exit(1)
775
699
    
776
700
    if not debug:
777
 
        logger.removeHandler(console)
778
 
        daemon()
779
 
    
780
 
    pidfilename = "/var/run/mandos/mandos.pid"
781
 
    pid = os.getpid()
782
 
    try:
783
 
        pidfile = open(pidfilename, "w")
784
 
        pidfile.write(str(pid) + "\n")
785
 
        pidfile.close()
786
 
        del pidfile
787
 
    except IOError, err:
788
 
        logger.error(u"Could not write %s file with PID %d",
789
 
                     pidfilename, os.getpid())
 
701
        daemon(False, False)
790
702
    
791
703
    def cleanup():
792
704
        "Cleanup function; run on exit"
806
718
    
807
719
    if not debug:
808
720
        signal.signal(signal.SIGINT, signal.SIG_IGN)
809
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
810
 
    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())
811
723
    
812
724
    for client in clients:
813
725
        client.start()
814
726
    
815
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
816
 
                                 server_settings["port"]),
 
727
    tcp_server = IPv6_TCPServer((options.address, options.port),
817
728
                                tcp_handler,
818
 
                                settings=server_settings,
 
729
                                options=options,
819
730
                                clients=clients)
820
 
    # Find out what port we got
821
 
    service.port = tcp_server.socket.getsockname()[1]
822
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
823
 
                u" scope_id %d" % tcp_server.socket.getsockname())
824
 
    
825
 
    #service.interface = tcp_server.socket.getsockname()[3]
826
 
    
827
 
    try:
828
 
        # From the Avahi example code
829
 
        server.connect_to_signal("StateChanged", server_state_changed)
830
 
        try:
831
 
            server_state_changed(server.GetState())
832
 
        except dbus.exceptions.DBusException, error:
833
 
            logger.critical(u"DBusException: %s", error)
834
 
            sys.exit(1)
835
 
        # End of Avahi example code
836
 
        
837
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
838
 
                             lambda *args, **kwargs:
839
 
                             tcp_server.handle_request\
840
 
                             (*args[2:], **kwargs) or True)
841
 
        
842
 
        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")
843
755
        main_loop_started = True
844
756
        main_loop.run()
845
 
    except AvahiError, error:
846
 
        logger.critical(u"AvahiError: %s" + unicode(error))
847
 
        sys.exit(1)
848
757
    except KeyboardInterrupt:
849
758
        if debug:
850
759
            print
 
760
    
 
761
    sys.exit(exitstatus)
851
762
 
852
763
if __name__ == '__main__':
853
764
    main()