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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
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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
24
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#     GNU General Public License for more details.
25
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26
# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see
28
 
# <http://www.gnu.org/licenses/>.
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
29
28
30
 
# 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/>.
31
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33
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from __future__ import division
62
62
from dbus.mainloop.glib import DBusGMainLoop
63
63
import ctypes
64
64
 
65
 
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
 
66
76
 
67
77
logger = logging.Logger('mandos')
68
78
syslogger = logging.handlers.SysLogHandler\
69
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
70
 
             address = "/dev/log")
 
79
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
71
80
syslogger.setFormatter(logging.Formatter\
72
 
                        ('Mandos: %(levelname)s: %(message)s'))
 
81
                        ('%(levelname)s: %(message)s'))
73
82
logger.addHandler(syslogger)
74
 
 
75
 
console = logging.StreamHandler()
76
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
77
 
                                       ' %(message)s'))
78
 
logger.addHandler(console)
79
 
 
80
 
class AvahiError(Exception):
81
 
    def __init__(self, value):
82
 
        self.value = value
83
 
    def __str__(self):
84
 
        return repr(self.value)
85
 
 
86
 
class AvahiServiceError(AvahiError):
87
 
    pass
88
 
 
89
 
class AvahiGroupError(AvahiError):
90
 
    pass
91
 
 
92
 
 
93
 
class AvahiService(object):
94
 
    """An Avahi (Zeroconf) service.
95
 
    Attributes:
96
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
97
 
               Used to optionally bind to the specified interface.
98
 
    name: string; Example: 'Mandos'
99
 
    type: string; Example: '_mandos._tcp'.
100
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
101
 
    port: integer; what port to announce
102
 
    TXT: list of strings; TXT record for the service
103
 
    domain: string; Domain to publish on, default to .local if empty.
104
 
    host: string; Host to publish records for, default is localhost
105
 
    max_renames: integer; maximum number of renames
106
 
    rename_count: integer; counter so we only rename after collisions
107
 
                  a sensible number of times
108
 
    """
109
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
110
 
                 type = None, port = None, TXT = None, domain = "",
111
 
                 host = "", max_renames = 32768):
112
 
        self.interface = interface
113
 
        self.name = name
114
 
        self.type = type
115
 
        self.port = port
116
 
        if TXT is None:
117
 
            self.TXT = []
118
 
        else:
119
 
            self.TXT = TXT
120
 
        self.domain = domain
121
 
        self.host = host
122
 
        self.rename_count = 0
123
 
        self.max_renames = max_renames
124
 
    def rename(self):
125
 
        """Derived from the Avahi example code"""
126
 
        if self.rename_count >= self.max_renames:
127
 
            logger.critical(u"No suitable Zeroconf service name found"
128
 
                            u" after %i retries, exiting.",
129
 
                            rename_count)
130
 
            raise AvahiServiceError("Too many renames")
131
 
        self.name = server.GetAlternativeServiceName(self.name)
132
 
        logger.info(u"Changing Zeroconf service name to %r ...",
133
 
                    str(self.name))
134
 
        syslogger.setFormatter(logging.Formatter\
135
 
                               ('Mandos (%s): %%(levelname)s:'
136
 
                               ' %%(message)s' % self.name))
137
 
        self.remove()
138
 
        self.add()
139
 
        self.rename_count += 1
140
 
    def remove(self):
141
 
        """Derived from the Avahi example code"""
142
 
        if group is not None:
143
 
            group.Reset()
144
 
    def add(self):
145
 
        """Derived from the Avahi example code"""
146
 
        global group
147
 
        if group is None:
148
 
            group = dbus.Interface\
149
 
                    (bus.get_object(avahi.DBUS_NAME,
150
 
                                    server.EntryGroupNew()),
151
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
 
            group.connect_to_signal('StateChanged',
153
 
                                    entry_group_state_changed)
154
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
155
 
                     service.name, service.type)
156
 
        group.AddService(
157
 
                self.interface,         # interface
158
 
                avahi.PROTO_INET6,      # protocol
159
 
                dbus.UInt32(0),         # flags
160
 
                self.name, self.type,
161
 
                self.domain, self.host,
162
 
                dbus.UInt16(self.port),
163
 
                avahi.string_array_to_txt_array(self.TXT))
164
 
        group.Commit()
165
 
 
 
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
166
89
# From the Avahi example code:
167
 
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
168
99
# End of Avahi example code
169
100
 
170
101
 
175
106
    fingerprint: string (40 or 32 hexadecimal digits); used to
176
107
                 uniquely identify the client
177
108
    secret:    bytestring; sent verbatim (over TLS) to client
178
 
    host:      string; available for use by the checker command
179
 
    created:   datetime.datetime(); object creation, not client host
180
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
181
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
182
 
                                     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
183
114
    interval:  datetime.timedelta(); How often to start a new checker
184
115
    stop_hook: If set, called by stop() as stop_hook(self)
185
116
    checker:   subprocess.Popen(); a running checker process used
186
117
                                   to see if the client lives.
187
 
                                   'None' if no process is running.
 
118
                                   Is None if no process is running.
188
119
    checker_initiator_tag: a gobject event source tag, or None
189
120
    stop_initiator_tag:    - '' -
190
121
    checker_callback_tag:  - '' -
191
122
    checker_command: string; External command which is run to check if
192
 
                     client lives.  %() expansions are done at
 
123
                     client lives.  %()s expansions are done at
193
124
                     runtime with vars(self) as dict, so that for
194
125
                     instance %(name)s can be used in the command.
195
126
    Private attibutes:
196
127
    _timeout: Real variable for 'timeout'
197
128
    _interval: Real variable for 'interval'
198
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
129
    _timeout_milliseconds: Used by gobject.timeout_add()
199
130
    _interval_milliseconds: - '' -
200
131
    """
201
132
    def _set_timeout(self, timeout):
221
152
    interval = property(lambda self: self._interval,
222
153
                        _set_interval)
223
154
    del _set_interval
224
 
    def __init__(self, name = None, stop_hook=None, config={}):
225
 
        """Note: the 'checker' key in 'config' sets the
226
 
        'checker_command' attribute and *not* the 'checker'
227
 
        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.."""
228
160
        self.name = name
229
161
        logger.debug(u"Creating client %r", self.name)
230
 
        # Uppercase and remove spaces from fingerprint for later
231
 
        # comparison purposes with return value from the fingerprint()
232
 
        # function
233
 
        self.fingerprint = config["fingerprint"].upper()\
234
 
                           .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"")
235
166
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
236
 
        if "secret" in config:
237
 
            self.secret = config["secret"].decode(u"base64")
238
 
        elif "secfile" in config:
239
 
            sf = open(config["secfile"])
 
167
        if secret:
 
168
            self.secret = secret.decode(u"base64")
 
169
        elif secfile:
 
170
            sf = open(secfile)
240
171
            self.secret = sf.read()
241
172
            sf.close()
242
173
        else:
243
 
            raise TypeError(u"No secret or secfile for client %s"
244
 
                            % self.name)
245
 
        self.host = config.get("host", "")
 
174
            raise RuntimeError(u"No secret or secfile for client %s"
 
175
                               % self.name)
 
176
        self.fqdn = fqdn                # string
246
177
        self.created = datetime.datetime.now()
247
 
        self.last_checked_ok = None
248
 
        self.timeout = string_to_delta(config["timeout"])
249
 
        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)
250
181
        self.stop_hook = stop_hook
251
182
        self.checker = None
252
183
        self.checker_initiator_tag = None
253
184
        self.stop_initiator_tag = None
254
185
        self.checker_callback_tag = None
255
 
        self.check_command = config["checker"]
 
186
        self.check_command = checker
256
187
    def start(self):
257
188
        """Start this client's checker and timeout hooks"""
258
189
        # Schedule a new checker to be started an 'interval' from now,
268
199
                                   self.stop)
269
200
    def stop(self):
270
201
        """Stop this client.
271
 
        The possibility that a client might be restarted is left open,
272
 
        but not currently used."""
 
202
        The possibility that this client might be restarted is left
 
203
        open, but not currently used."""
273
204
        # If this client doesn't have a secret, it is already stopped.
274
 
        if hasattr(self, "secret") and self.secret:
275
 
            logger.info(u"Stopping client %s", self.name)
 
205
        if self.secret:
 
206
            logger.debug(u"Stopping client %s", self.name)
276
207
            self.secret = None
277
208
        else:
278
209
            return False
279
 
        if getattr(self, "stop_initiator_tag", False):
 
210
        if hasattr(self, "stop_initiator_tag") \
 
211
               and self.stop_initiator_tag:
280
212
            gobject.source_remove(self.stop_initiator_tag)
281
213
            self.stop_initiator_tag = None
282
 
        if getattr(self, "checker_initiator_tag", False):
 
214
        if hasattr(self, "checker_initiator_tag") \
 
215
               and self.checker_initiator_tag:
283
216
            gobject.source_remove(self.checker_initiator_tag)
284
217
            self.checker_initiator_tag = None
285
218
        self.stop_checker()
297
230
        self.checker = None
298
231
        if os.WIFEXITED(condition) \
299
232
               and (os.WEXITSTATUS(condition) == 0):
300
 
            logger.info(u"Checker for %(name)s succeeded",
301
 
                        vars(self))
302
 
            self.last_checked_ok = now
 
233
            logger.debug(u"Checker for %(name)s succeeded",
 
234
                         vars(self))
 
235
            self.last_seen = now
303
236
            gobject.source_remove(self.stop_initiator_tag)
304
237
            self.stop_initiator_tag = gobject.timeout_add\
305
238
                                      (self._timeout_milliseconds,
308
241
            logger.warning(u"Checker for %(name)s crashed?",
309
242
                           vars(self))
310
243
        else:
311
 
            logger.info(u"Checker for %(name)s failed",
312
 
                        vars(self))
 
244
            logger.debug(u"Checker for %(name)s failed",
 
245
                         vars(self))
313
246
    def start_checker(self):
314
247
        """Start a new checker subprocess if one is not running.
315
248
        If a checker already exists, leave it running and do
324
257
        # is as it should be.
325
258
        if self.checker is None:
326
259
            try:
327
 
                # In case check_command has exactly one % operator
328
 
                command = self.check_command % self.host
 
260
                command = self.check_command % self.fqdn
329
261
            except TypeError:
330
 
                # Escape attributes for the shell
331
262
                escaped_attrs = dict((key, re.escape(str(val)))
332
263
                                     for key, val in
333
264
                                     vars(self).iteritems())
334
265
                try:
335
266
                    command = self.check_command % escaped_attrs
336
267
                except TypeError, error:
337
 
                    logger.error(u'Could not format string "%s":'
338
 
                                 u' %s', self.check_command, error)
 
268
                    logger.critical(u'Could not format string "%s":'
 
269
                                    u' %s', self.check_command, error)
339
270
                    return True # Try again later
340
271
            try:
341
 
                logger.info(u"Starting checker %r for %s",
342
 
                            command, self.name)
343
 
                # We don't need to redirect stdout and stderr, since
344
 
                # in normal mode, that is already done by daemon(),
345
 
                # and in debug mode we don't want to.  (Stdin is
346
 
                # always replaced by /dev/null.)
347
 
                self.checker = subprocess.Popen(command,
348
 
                                                close_fds=True,
349
 
                                                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="/")
350
278
                self.checker_callback_tag = gobject.child_watch_add\
351
279
                                            (self.checker.pid,
352
280
                                             self.checker_callback)
353
 
            except OSError, error:
 
281
            except subprocess.OSError, error:
354
282
                logger.error(u"Failed to start subprocess: %s",
355
283
                             error)
356
284
        # Re-run this periodically if run by gobject.timeout_add
360
288
        if self.checker_callback_tag:
361
289
            gobject.source_remove(self.checker_callback_tag)
362
290
            self.checker_callback_tag = None
363
 
        if getattr(self, "checker", None) is None:
 
291
        if not hasattr(self, "checker") or self.checker is None:
364
292
            return
365
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
293
        logger.debug("Stopping checker for %(name)s", vars(self))
366
294
        try:
367
295
            os.kill(self.checker.pid, signal.SIGTERM)
368
296
            #os.sleep(0.5)
369
297
            #if self.checker.poll() is None:
370
298
            #    os.kill(self.checker.pid, signal.SIGKILL)
371
299
        except OSError, error:
372
 
            if error.errno != errno.ESRCH: # No such process
 
300
            if error.errno != errno.ESRCH:
373
301
                raise
374
302
        self.checker = None
375
 
    def still_valid(self):
 
303
    def still_valid(self, now=None):
376
304
        """Has the timeout not yet passed for this client?"""
377
 
        now = datetime.datetime.now()
378
 
        if self.last_checked_ok is None:
 
305
        if now is None:
 
306
            now = datetime.datetime.now()
 
307
        if self.last_seen is None:
379
308
            return now < (self.created + self.timeout)
380
309
        else:
381
 
            return now < (self.last_checked_ok + self.timeout)
 
310
            return now < (self.last_seen + self.timeout)
382
311
 
383
312
 
384
313
def peer_certificate(session):
400
329
 
401
330
def fingerprint(openpgp):
402
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))
403
336
    # New GnuTLS "datum" with the OpenPGP public key
404
337
    datum = gnutls.library.types.gnutls_datum_t\
405
338
        (ctypes.cast(ctypes.c_char_p(openpgp),
406
339
                     ctypes.POINTER(ctypes.c_ubyte)),
407
340
         ctypes.c_uint(len(openpgp)))
408
 
    # New empty GnuTLS certificate
409
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
410
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
411
 
        (ctypes.byref(crt))
412
341
    # Import the OpenPGP public key into the certificate
413
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
414
 
                    (crt, ctypes.byref(datum),
415
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
416
 
    # Verify the self signature in the key
417
 
    crtverify = ctypes.c_uint();
418
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
419
 
        (crt, 0, ctypes.byref(crtverify))
420
 
    if crtverify.value != 0:
421
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
422
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
342
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
343
        (crt,
 
344
         ctypes.byref(datum),
 
345
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
423
346
    # New buffer for the fingerprint
424
347
    buffer = ctypes.create_string_buffer(20)
425
348
    buffer_length = ctypes.c_size_t()
441
364
    Note: This will run in its own forked process."""
442
365
    
443
366
    def handle(self):
444
 
        logger.info(u"TCP connection from: %s",
 
367
        logger.debug(u"TCP connection from: %s",
445
368
                     unicode(self.client_address))
446
 
        session = gnutls.connection.ClientSession\
447
 
                  (self.request, gnutls.connection.X509Credentials())
448
 
        
449
 
        line = self.request.makefile().readline()
450
 
        logger.debug(u"Protocol version: %r", line)
451
 
        try:
452
 
            if int(line.strip().split()[0]) > 1:
453
 
                raise RuntimeError
454
 
        except (ValueError, IndexError, RuntimeError), error:
455
 
            logger.error(u"Unknown protocol version: %s", error)
456
 
            return
457
 
        
458
 
        # Note: gnutls.connection.X509Credentials is really a generic
459
 
        # GnuTLS certificate credentials object so long as no X.509
460
 
        # keys are added to it.  Therefore, we can use it here despite
461
 
        # using OpenPGP certificates.
 
369
        session = gnutls.connection.ClientSession(self.request,
 
370
                                                  gnutls.connection.\
 
371
                                                  X509Credentials())
462
372
        
463
373
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
464
374
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
465
375
        #                "+DHE-DSS"))
466
 
        priority = "NORMAL"             # Fallback default, since this
467
 
                                        # MUST be set.
468
 
        if self.server.settings["priority"]:
469
 
            priority = self.server.settings["priority"]
 
376
        priority = "NORMAL"
 
377
        if self.server.options.priority:
 
378
            priority = self.server.options.priority
470
379
        gnutls.library.functions.gnutls_priority_set_direct\
471
380
            (session._c_object, priority, None);
472
381
        
473
382
        try:
474
383
            session.handshake()
475
384
        except gnutls.errors.GNUTLSError, error:
476
 
            logger.warning(u"Handshake failed: %s", error)
 
385
            logger.debug(u"Handshake failed: %s", error)
477
386
            # Do not run session.bye() here: the session is not
478
387
            # established.  Just abandon the request.
479
388
            return
480
389
        try:
481
390
            fpr = fingerprint(peer_certificate(session))
482
391
        except (TypeError, gnutls.errors.GNUTLSError), error:
483
 
            logger.warning(u"Bad certificate: %s", error)
 
392
            logger.debug(u"Bad certificate: %s", error)
484
393
            session.bye()
485
394
            return
486
395
        logger.debug(u"Fingerprint: %s", fpr)
489
398
            if c.fingerprint == fpr:
490
399
                client = c
491
400
                break
492
 
        if not client:
493
 
            logger.warning(u"Client not found for fingerprint: %s",
494
 
                           fpr)
495
 
            session.bye()
496
 
            return
497
401
        # Have to check if client.still_valid(), since it is possible
498
402
        # that the client timed out while establishing the GnuTLS
499
403
        # session.
500
 
        if not client.still_valid():
501
 
            logger.warning(u"Client %(name)s is invalid",
502
 
                           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)
503
411
            session.bye()
504
412
            return
505
413
        sent_size = 0
515
423
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
516
424
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
517
425
    Attributes:
518
 
        settings:       Server settings
 
426
        options:        Command line options
519
427
        clients:        Set() of Client objects
520
428
    """
521
429
    address_family = socket.AF_INET6
522
430
    def __init__(self, *args, **kwargs):
523
 
        if "settings" in kwargs:
524
 
            self.settings = kwargs["settings"]
525
 
            del kwargs["settings"]
 
431
        if "options" in kwargs:
 
432
            self.options = kwargs["options"]
 
433
            del kwargs["options"]
526
434
        if "clients" in kwargs:
527
435
            self.clients = kwargs["clients"]
528
436
            del kwargs["clients"]
531
439
        """This overrides the normal server_bind() function
532
440
        to bind to an interface if one was specified, and also NOT to
533
441
        bind to an address or port if they were not specified."""
534
 
        if self.settings["interface"]:
535
 
            # 25 is from /usr/include/asm-i486/socket.h
536
 
            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
537
446
            try:
538
447
                self.socket.setsockopt(socket.SOL_SOCKET,
539
 
                                       SO_BINDTODEVICE,
540
 
                                       self.settings["interface"])
 
448
                                       socket.SO_BINDTODEVICE,
 
449
                                       self.options.interface)
541
450
            except socket.error, error:
542
451
                if error[0] == errno.EPERM:
543
 
                    logger.error(u"No permission to"
544
 
                                 u" bind to interface %s",
545
 
                                 self.settings["interface"])
 
452
                    logger.warning(u"No permission to"
 
453
                                   u" bind to interface %s",
 
454
                                   self.options.interface)
546
455
                else:
547
456
                    raise error
548
457
        # Only bind(2) the socket if we really need to.
551
460
                in6addr_any = "::"
552
461
                self.server_address = (in6addr_any,
553
462
                                       self.server_address[1])
554
 
            elif not self.server_address[1]:
 
463
            elif self.server_address[1] is None:
555
464
                self.server_address = (self.server_address[0],
556
465
                                       0)
557
 
#                 if self.settings["interface"]:
558
 
#                     self.server_address = (self.server_address[0],
559
 
#                                            0, # port
560
 
#                                            0, # flowinfo
561
 
#                                            if_nametoindex
562
 
#                                            (self.settings
563
 
#                                             ["interface"]))
564
466
            return super(type(self), self).server_bind()
565
467
 
566
468
 
577
479
    datetime.timedelta(1)
578
480
    >>> string_to_delta(u'1w')
579
481
    datetime.timedelta(7)
580
 
    >>> string_to_delta('5m 30s')
581
 
    datetime.timedelta(0, 330)
582
482
    """
583
 
    timevalue = datetime.timedelta(0)
584
 
    for s in interval.split():
585
 
        try:
586
 
            suffix=unicode(s[-1])
587
 
            value=int(s[:-1])
588
 
            if suffix == u"d":
589
 
                delta = datetime.timedelta(value)
590
 
            elif suffix == u"s":
591
 
                delta = datetime.timedelta(0, value)
592
 
            elif suffix == u"m":
593
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
594
 
            elif suffix == u"h":
595
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
596
 
            elif suffix == u"w":
597
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
598
 
            else:
599
 
                raise ValueError
600
 
        except (ValueError, IndexError):
 
483
    try:
 
484
        suffix=unicode(interval[-1])
 
485
        value=int(interval[:-1])
 
486
        if suffix == u"d":
 
487
            delta = datetime.timedelta(value)
 
488
        elif suffix == u"s":
 
489
            delta = datetime.timedelta(0, value)
 
490
        elif suffix == u"m":
 
491
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
492
        elif suffix == u"h":
 
493
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
494
        elif suffix == u"w":
 
495
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
496
        else:
601
497
            raise ValueError
602
 
        timevalue += delta
603
 
    return timevalue
 
498
    except (ValueError, IndexError):
 
499
        raise ValueError
 
500
    return delta
 
501
 
 
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()
604
534
 
605
535
 
606
536
def server_state_changed(state):
607
537
    """Derived from the Avahi example code"""
608
538
    if state == avahi.SERVER_COLLISION:
609
 
        logger.error(u"Zeroconf server name collision")
610
 
        service.remove()
 
539
        logger.warning(u"Server name collision")
 
540
        remove_service()
611
541
    elif state == avahi.SERVER_RUNNING:
612
 
        service.add()
 
542
        add_service()
613
543
 
614
544
 
615
545
def entry_group_state_changed(state, error):
616
546
    """Derived from the Avahi example code"""
617
 
    logger.debug(u"Avahi state change: %i", state)
 
547
    global serviceName, server, rename_count
 
548
    
 
549
    logger.debug(u"state change: %i", state)
618
550
    
619
551
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
620
 
        logger.debug(u"Zeroconf service established.")
 
552
        logger.debug(u"Service established.")
621
553
    elif state == avahi.ENTRY_GROUP_COLLISION:
622
 
        logger.warning(u"Zeroconf service name collision.")
623
 
        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)
624
567
    elif state == avahi.ENTRY_GROUP_FAILURE:
625
 
        logger.critical(u"Avahi: Error in group state changed %s",
626
 
                        unicode(error))
627
 
        raise AvahiGroupError("State changed: %s", str(error))
 
568
        logger.error(u"Error in group state changed %s",
 
569
                     unicode(error))
 
570
        killme(1)
 
571
 
628
572
 
629
573
def if_nametoindex(interface):
630
 
    """Call the C function if_nametoindex(), or equivalent"""
631
 
    global if_nametoindex
 
574
    """Call the C function if_nametoindex()"""
632
575
    try:
633
 
        if "ctypes.util" not in sys.modules:
634
 
            import ctypes.util
635
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
636
 
            (ctypes.util.find_library("c")).if_nametoindex
 
576
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
577
        return libc.if_nametoindex(interface)
637
578
    except (OSError, AttributeError):
638
579
        if "struct" not in sys.modules:
639
580
            import struct
640
581
        if "fcntl" not in sys.modules:
641
582
            import fcntl
642
 
        def if_nametoindex(interface):
643
 
            "Get an interface index the hard way, i.e. using fcntl()"
644
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
645
 
            s = socket.socket()
646
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
647
 
                                struct.pack("16s16x", interface))
648
 
            s.close()
649
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
650
 
            return interface_index
651
 
    return if_nametoindex(interface)
652
 
 
653
 
 
654
 
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):
655
593
    """See daemon(3).  Standard BSD Unix function.
656
594
    This should really exist as os.daemon, but it doesn't (yet)."""
657
595
    if os.fork():
659
597
    os.setsid()
660
598
    if not nochdir:
661
599
        os.chdir("/")
662
 
    if os.fork():
663
 
        sys.exit()
664
600
    if not noclose:
665
601
        # Close all standard open file descriptors
666
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
602
        null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
667
603
        if not stat.S_ISCHR(os.fstat(null).st_mode):
668
604
            raise OSError(errno.ENODEV,
669
605
                          "/dev/null not a character device")
674
610
            os.close(null)
675
611
 
676
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
 
677
622
def main():
 
623
    global exitstatus
 
624
    exitstatus = 0
678
625
    global main_loop_started
679
626
    main_loop_started = False
680
627
    
681
 
    parser = OptionParser(version = "%%prog %s" % version)
 
628
    parser = OptionParser()
682
629
    parser.add_option("-i", "--interface", type="string",
683
 
                      metavar="IF", help="Bind to interface IF")
684
 
    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,
685
633
                      help="Address to listen for requests on")
686
 
    parser.add_option("-p", "--port", type="int",
 
634
    parser.add_option("-p", "--port", type="int", default=None,
687
635
                      help="Port number to receive requests on")
688
636
    parser.add_option("--check", action="store_true", default=False,
689
637
                      help="Run self-test")
690
 
    parser.add_option("--debug", action="store_true",
691
 
                      help="Debug mode; run in foreground and log to"
692
 
                      " terminal")
693
 
    parser.add_option("--priority", type="string", help="GnuTLS"
694
 
                      " priority string (see GnuTLS documentation)")
695
 
    parser.add_option("--servicename", type="string", metavar="NAME",
696
 
                      help="Zeroconf service name")
697
 
    parser.add_option("--configdir", type="string",
698
 
                      default="/etc/mandos", metavar="DIR",
699
 
                      help="Directory to search for configuration"
700
 
                      " 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")
701
646
    (options, args) = parser.parse_args()
702
647
    
703
648
    if options.check:
705
650
        doctest.testmod()
706
651
        sys.exit()
707
652
    
708
 
    # Default values for config file for server-global settings
709
 
    server_defaults = { "interface": "",
710
 
                        "address": "",
711
 
                        "port": "",
712
 
                        "debug": "False",
713
 
                        "priority":
714
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
715
 
                        "servicename": "Mandos",
716
 
                        }
717
 
    
718
 
    # Parse config file for server-global settings
719
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
720
 
    del server_defaults
721
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
722
 
    # Convert the SafeConfigParser object to a dict
723
 
    server_settings = server_config.defaults()
724
 
    # Use getboolean on the boolean config option
725
 
    server_settings["debug"] = server_config.getboolean\
726
 
                               ("DEFAULT", "debug")
727
 
    del server_config
728
 
    
729
 
    # Override the settings from the config file with command line
730
 
    # options, if set.
731
 
    for option in ("interface", "address", "port", "debug",
732
 
                   "priority", "servicename", "configdir"):
733
 
        value = getattr(options, option)
734
 
        if value is not None:
735
 
            server_settings[option] = value
736
 
    del options
737
 
    # Now we have our good server settings in "server_settings"
738
 
    
739
 
    debug = server_settings["debug"]
740
 
    
741
 
    if not debug:
742
 
        syslogger.setLevel(logging.WARNING)
743
 
        console.setLevel(logging.WARNING)
744
 
    
745
 
    if server_settings["servicename"] != "Mandos":
746
 
        syslogger.setFormatter(logging.Formatter\
747
 
                               ('Mandos (%s): %%(levelname)s:'
748
 
                                ' %%(message)s'
749
 
                                % server_settings["servicename"]))
750
 
    
751
 
    # Parse config file with clients
752
 
    client_defaults = { "timeout": "1h",
753
 
                        "interval": "5m",
754
 
                        "checker": "fping -q -- %(host)s",
755
 
                        "host": "",
756
 
                        }
757
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
758
 
    client_config.read(os.path.join(server_settings["configdir"],
759
 
                                    "clients.conf"))
760
 
    
761
 
    global service
762
 
    service = AvahiService(name = server_settings["servicename"],
763
 
                           type = "_mandos._tcp", );
764
 
    if server_settings["interface"]:
765
 
        service.interface = if_nametoindex\
766
 
                            (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;
767
664
    
768
665
    global main_loop
769
666
    global bus
772
669
    DBusGMainLoop(set_as_default=True )
773
670
    main_loop = gobject.MainLoop()
774
671
    bus = dbus.SystemBus()
775
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
776
 
                                           avahi.DBUS_PATH_SERVER),
777
 
                            avahi.DBUS_INTERFACE_SERVER)
 
672
    server = dbus.Interface(
 
673
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
674
            avahi.DBUS_INTERFACE_SERVER )
778
675
    # End of Avahi example code
779
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
    
780
687
    clients = Set()
781
688
    def remove_from_clients(client):
782
689
        clients.remove(client)
783
690
        if not clients:
784
 
            logger.critical(u"No clients left, exiting")
785
 
            sys.exit()
 
691
            logger.debug(u"No clients left, exiting")
 
692
            killme()
786
693
    
787
 
    clients.update(Set(Client(name = section,
 
694
    clients.update(Set(Client(name=section,
788
695
                              stop_hook = remove_from_clients,
789
 
                              config
790
 
                              = dict(client_config.items(section)))
 
696
                              **(dict(client_config\
 
697
                                      .items(section))))
791
698
                       for section in client_config.sections()))
792
 
    if not clients:
793
 
        logger.critical(u"No clients defined")
794
 
        sys.exit(1)
795
 
    
796
 
    if debug:
797
 
        # Redirect stdin so all checkers get /dev/null
798
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
799
 
        os.dup2(null, sys.stdin.fileno())
800
 
        if null > 2:
801
 
            os.close(null)
802
 
    else:
803
 
        # No console logging
804
 
        logger.removeHandler(console)
805
 
        # Close all input and output, do double fork, etc.
806
 
        daemon()
807
 
    
808
 
    pidfilename = "/var/run/mandos/mandos.pid"
809
 
    pid = os.getpid()
810
 
    try:
811
 
        pidfile = open(pidfilename, "w")
812
 
        pidfile.write(str(pid) + "\n")
813
 
        pidfile.close()
814
 
        del pidfile
815
 
    except IOError, err:
816
 
        logger.error(u"Could not write %s file with PID %d",
817
 
                     pidfilename, os.getpid())
 
699
    
 
700
    if not debug:
 
701
        daemon(False, False)
818
702
    
819
703
    def cleanup():
820
704
        "Cleanup function; run on exit"
834
718
    
835
719
    if not debug:
836
720
        signal.signal(signal.SIGINT, signal.SIG_IGN)
837
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
838
 
    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())
839
723
    
840
724
    for client in clients:
841
725
        client.start()
842
726
    
843
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
844
 
                                 server_settings["port"]),
 
727
    tcp_server = IPv6_TCPServer((options.address, options.port),
845
728
                                tcp_handler,
846
 
                                settings=server_settings,
 
729
                                options=options,
847
730
                                clients=clients)
848
 
    # Find out what port we got
849
 
    service.port = tcp_server.socket.getsockname()[1]
850
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
851
 
                u" scope_id %d" % tcp_server.socket.getsockname())
852
 
    
853
 
    #service.interface = tcp_server.socket.getsockname()[3]
854
 
    
855
 
    try:
856
 
        # From the Avahi example code
857
 
        server.connect_to_signal("StateChanged", server_state_changed)
858
 
        try:
859
 
            server_state_changed(server.GetState())
860
 
        except dbus.exceptions.DBusException, error:
861
 
            logger.critical(u"DBusException: %s", error)
862
 
            sys.exit(1)
863
 
        # End of Avahi example code
864
 
        
865
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
866
 
                             lambda *args, **kwargs:
867
 
                             tcp_server.handle_request\
868
 
                             (*args[2:], **kwargs) or True)
869
 
        
870
 
        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")
871
755
        main_loop_started = True
872
756
        main_loop.run()
873
 
    except AvahiError, error:
874
 
        logger.critical(u"AvahiError: %s" + unicode(error))
875
 
        sys.exit(1)
876
757
    except KeyboardInterrupt:
877
758
        if debug:
878
759
            print
 
760
    
 
761
    sys.exit(exitstatus)
879
762
 
880
763
if __name__ == '__main__':
881
764
    main()