/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2008-10-05 17:38:31 UTC
  • Revision ID: teddy@fukt.bsnet.se-20081005173831-fysrfayl4yvhlo6x
* INSTALL: Add instructions on how to set the correct network
           interface on the cient, and also how to test the server and
           verify the password.

* TODO: Clean up old stuff.

* debian/mandos-client.README.Debian: Separate into sections with
                                      headlines.  Add instructions on
                                      how to test the server and
                                      verify the password.

* plugin-runner.conf: Add reminder to update initrd image.

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Lines of Context:
mandos
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# This program is partly derived from an example program for an Avahi
7
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# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# following functions: "AvahiService.add", "AvahiService.remove",
10
 
# "server_state_changed", "entry_group_state_changed", and some lines
11
 
# in "main".
 
9
# methods "add" and "remove" in the "AvahiService" class, the
 
10
# "server_state_changed" and "entry_group_state_changed" functions,
 
11
# and some lines in "main".
12
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# 
13
13
# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
14
# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
15
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# 
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
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# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
27
# along with this program.  If not, see
 
28
# <http://www.gnu.org/licenses/>.
28
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# 
29
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# Contact the authors at <mandos@fukt.bsnet.se>.
30
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# 
33
34
 
34
35
import SocketServer
35
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import socket
36
 
import select
37
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from optparse import OptionParser
38
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import datetime
39
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import errno
54
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import stat
55
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import logging
56
56
import logging.handlers
 
57
import pwd
57
58
 
58
59
import dbus
59
60
import gobject
60
61
import avahi
61
62
from dbus.mainloop.glib import DBusGMainLoop
62
63
import ctypes
63
 
 
64
 
# Brief description of the operation of this program:
65
 
# 
66
 
# This server announces itself as a Zeroconf service.  Connecting
67
 
# clients use the TLS protocol, with the unusual quirk that this
68
 
# server program acts as a TLS "client" while a connecting client acts
69
 
# as a TLS "server".  The client (acting as a TLS "server") must
70
 
# supply an OpenPGP certificate, and the fingerprint of this
71
 
# certificate is used by this server to look up (in a list read from a
72
 
# file at start time) which binary blob to give the client.  No other
73
 
# authentication or authorization is done by this server.
74
 
 
 
64
import ctypes.util
 
65
 
 
66
version = "1.0"
75
67
 
76
68
logger = logging.Logger('mandos')
77
69
syslogger = logging.handlers.SysLogHandler\
78
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
70
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
71
             address = "/dev/log")
79
72
syslogger.setFormatter(logging.Formatter\
80
 
                        ('%(levelname)s: %(message)s'))
 
73
                        ('Mandos: %(levelname)s: %(message)s'))
81
74
logger.addHandler(syslogger)
82
 
del syslogger
83
75
 
 
76
console = logging.StreamHandler()
 
77
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
 
78
                                       ' %(message)s'))
 
79
logger.addHandler(console)
84
80
 
85
81
class AvahiError(Exception):
86
82
    def __init__(self, value):
87
83
        self.value = value
 
84
        super(AvahiError, self).__init__()
88
85
    def __str__(self):
89
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        return repr(self.value)
90
87
 
96
93
 
97
94
 
98
95
class AvahiService(object):
99
 
    """
 
96
    """An Avahi (Zeroconf) service.
 
97
    Attributes:
100
98
    interface: integer; avahi.IF_UNSPEC or an interface index.
101
99
               Used to optionally bind to the specified interface.
102
 
    name = string; Example: "Mandos"
103
 
    type = string; Example: "_mandos._tcp".
104
 
                   See <http://www.dns-sd.org/ServiceTypes.html>
105
 
    port = integer; what port to announce
106
 
    TXT = list of strings; TXT record for the service
107
 
    domain = string; Domain to publish on, default to .local if empty.
108
 
    host = string; Host to publish records for, default to localhost
109
 
                   if empty.
110
 
    max_renames = integer; maximum number of renames
111
 
    rename_count = integer; counter so we only rename after collisions
112
 
                   a sensible number of times
 
100
    name: string; Example: 'Mandos'
 
101
    type: string; Example: '_mandos._tcp'.
 
102
                  See <http://www.dns-sd.org/ServiceTypes.html>
 
103
    port: integer; what port to announce
 
104
    TXT: list of strings; TXT record for the service
 
105
    domain: string; Domain to publish on, default to .local if empty.
 
106
    host: string; Host to publish records for, default is localhost
 
107
    max_renames: integer; maximum number of renames
 
108
    rename_count: integer; counter so we only rename after collisions
 
109
                  a sensible number of times
113
110
    """
114
111
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 type = None, port = None, TXT = None, domain = "",
116
 
                 host = "", max_renames = 12):
117
 
        """An Avahi (Zeroconf) service. """
 
112
                 servicetype = None, port = None, TXT = None, domain = "",
 
113
                 host = "", max_renames = 32768):
118
114
        self.interface = interface
119
115
        self.name = name
120
 
        self.type = type
 
116
        self.type = servicetype
121
117
        self.port = port
122
118
        if TXT is None:
123
119
            self.TXT = []
126
122
        self.domain = domain
127
123
        self.host = host
128
124
        self.rename_count = 0
 
125
        self.max_renames = max_renames
129
126
    def rename(self):
130
127
        """Derived from the Avahi example code"""
131
128
        if self.rename_count >= self.max_renames:
132
 
            logger.critical(u"No suitable service name found after %i"
133
 
                            u" retries, exiting.", rename_count)
 
129
            logger.critical(u"No suitable Zeroconf service name found"
 
130
                            u" after %i retries, exiting.",
 
131
                            self.rename_count)
134
132
            raise AvahiServiceError("Too many renames")
135
 
        name = server.GetAlternativeServiceName(name)
136
 
        logger.notice(u"Changing name to %r ...", name)
 
133
        self.name = server.GetAlternativeServiceName(self.name)
 
134
        logger.info(u"Changing Zeroconf service name to %r ...",
 
135
                    str(self.name))
 
136
        syslogger.setFormatter(logging.Formatter\
 
137
                               ('Mandos (%s): %%(levelname)s:'
 
138
                               ' %%(message)s' % self.name))
137
139
        self.remove()
138
140
        self.add()
139
141
        self.rename_count += 1
151
153
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
154
            group.connect_to_signal('StateChanged',
153
155
                                    entry_group_state_changed)
154
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
 
156
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
155
157
                     service.name, service.type)
156
158
        group.AddService(
157
159
                self.interface,         # interface
175
177
    fingerprint: string (40 or 32 hexadecimal digits); used to
176
178
                 uniquely identify the client
177
179
    secret:    bytestring; sent verbatim (over TLS) to client
178
 
    fqdn:      string (FQDN); available for use by the checker command
 
180
    host:      string; available for use by the checker command
179
181
    created:   datetime.datetime(); object creation, not client host
180
182
    last_checked_ok: datetime.datetime() or None if not yet checked OK
181
183
    timeout:   datetime.timedelta(); How long from last_checked_ok
221
223
    interval = property(lambda self: self._interval,
222
224
                        _set_interval)
223
225
    del _set_interval
224
 
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
225
 
                 secret=None, secfile=None, fqdn=None, timeout=None,
226
 
                 interval=-1, checker=None):
227
 
        """Note: the 'checker' argument sets the 'checker_command'
228
 
        attribute and not the 'checker' attribute.."""
 
226
    def __init__(self, name = None, stop_hook=None, config=None):
 
227
        """Note: the 'checker' key in 'config' sets the
 
228
        'checker_command' attribute and *not* the 'checker'
 
229
        attribute."""
 
230
        if config is None:
 
231
            config = {}
229
232
        self.name = name
230
233
        logger.debug(u"Creating client %r", self.name)
231
 
        # Uppercase and remove spaces from fingerprint
232
 
        # for later comparison purposes with return value of
233
 
        # the fingerprint() function
234
 
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
234
        # Uppercase and remove spaces from fingerprint for later
 
235
        # comparison purposes with return value from the fingerprint()
 
236
        # function
 
237
        self.fingerprint = config["fingerprint"].upper()\
 
238
                           .replace(u" ", u"")
235
239
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
236
 
        if secret:
237
 
            self.secret = secret.decode(u"base64")
238
 
        elif secfile:
239
 
            sf = open(secfile)
240
 
            self.secret = sf.read()
241
 
            sf.close()
 
240
        if "secret" in config:
 
241
            self.secret = config["secret"].decode(u"base64")
 
242
        elif "secfile" in config:
 
243
            secfile = open(os.path.expanduser(os.path.expandvars
 
244
                                              (config["secfile"])))
 
245
            self.secret = secfile.read()
 
246
            secfile.close()
242
247
        else:
243
248
            raise TypeError(u"No secret or secfile for client %s"
244
249
                            % self.name)
245
 
        self.fqdn = fqdn
 
250
        self.host = config.get("host", "")
246
251
        self.created = datetime.datetime.now()
247
252
        self.last_checked_ok = None
248
 
        self.timeout = string_to_delta(timeout)
249
 
        self.interval = string_to_delta(interval)
 
253
        self.timeout = string_to_delta(config["timeout"])
 
254
        self.interval = string_to_delta(config["interval"])
250
255
        self.stop_hook = stop_hook
251
256
        self.checker = None
252
257
        self.checker_initiator_tag = None
253
258
        self.stop_initiator_tag = None
254
259
        self.checker_callback_tag = None
255
 
        self.check_command = checker
 
260
        self.check_command = config["checker"]
256
261
    def start(self):
257
262
        """Start this client's checker and timeout hooks"""
258
263
        # Schedule a new checker to be started an 'interval' from now,
271
276
        The possibility that a client might be restarted is left open,
272
277
        but not currently used."""
273
278
        # If this client doesn't have a secret, it is already stopped.
274
 
        if self.secret:
275
 
            logger.debug(u"Stopping client %s", self.name)
 
279
        if hasattr(self, "secret") and self.secret:
 
280
            logger.info(u"Stopping client %s", self.name)
276
281
            self.secret = None
277
282
        else:
278
283
            return False
297
302
        self.checker = None
298
303
        if os.WIFEXITED(condition) \
299
304
               and (os.WEXITSTATUS(condition) == 0):
300
 
            logger.debug(u"Checker for %(name)s succeeded",
301
 
                         vars(self))
 
305
            logger.info(u"Checker for %(name)s succeeded",
 
306
                        vars(self))
302
307
            self.last_checked_ok = now
303
308
            gobject.source_remove(self.stop_initiator_tag)
304
309
            self.stop_initiator_tag = gobject.timeout_add\
308
313
            logger.warning(u"Checker for %(name)s crashed?",
309
314
                           vars(self))
310
315
        else:
311
 
            logger.debug(u"Checker for %(name)s failed",
312
 
                         vars(self))
 
316
            logger.info(u"Checker for %(name)s failed",
 
317
                        vars(self))
313
318
    def start_checker(self):
314
319
        """Start a new checker subprocess if one is not running.
315
320
        If a checker already exists, leave it running and do
325
330
        if self.checker is None:
326
331
            try:
327
332
                # In case check_command has exactly one % operator
328
 
                command = self.check_command % self.fqdn
 
333
                command = self.check_command % self.host
329
334
            except TypeError:
330
335
                # Escape attributes for the shell
331
336
                escaped_attrs = dict((key, re.escape(str(val)))
338
343
                                 u' %s', self.check_command, error)
339
344
                    return True # Try again later
340
345
            try:
341
 
                logger.debug(u"Starting checker %r for %s",
342
 
                             command, self.name)
 
346
                logger.info(u"Starting checker %r for %s",
 
347
                            command, self.name)
 
348
                # We don't need to redirect stdout and stderr, since
 
349
                # in normal mode, that is already done by daemon(),
 
350
                # and in debug mode we don't want to.  (Stdin is
 
351
                # always replaced by /dev/null.)
343
352
                self.checker = subprocess.Popen(command,
344
353
                                                close_fds=True,
345
354
                                                shell=True, cwd="/")
346
355
                self.checker_callback_tag = gobject.child_watch_add\
347
356
                                            (self.checker.pid,
348
357
                                             self.checker_callback)
349
 
            except subprocess.OSError, error:
 
358
            except OSError, error:
350
359
                logger.error(u"Failed to start subprocess: %s",
351
360
                             error)
352
361
        # Re-run this periodically if run by gobject.timeout_add
358
367
            self.checker_callback_tag = None
359
368
        if getattr(self, "checker", None) is None:
360
369
            return
361
 
        logger.debug("Stopping checker for %(name)s", vars(self))
 
370
        logger.debug(u"Stopping checker for %(name)s", vars(self))
362
371
        try:
363
372
            os.kill(self.checker.pid, signal.SIGTERM)
364
373
            #os.sleep(0.5)
396
405
 
397
406
def fingerprint(openpgp):
398
407
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
399
 
    # New empty GnuTLS certificate
400
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
401
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
402
 
        (ctypes.byref(crt))
403
408
    # New GnuTLS "datum" with the OpenPGP public key
404
409
    datum = gnutls.library.types.gnutls_datum_t\
405
410
        (ctypes.cast(ctypes.c_char_p(openpgp),
406
411
                     ctypes.POINTER(ctypes.c_ubyte)),
407
412
         ctypes.c_uint(len(openpgp)))
 
413
    # New empty GnuTLS certificate
 
414
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
415
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
416
        (ctypes.byref(crt))
408
417
    # Import the OpenPGP public key into the certificate
409
 
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
410
 
        (crt,
411
 
         ctypes.byref(datum),
412
 
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
418
    gnutls.library.functions.gnutls_openpgp_crt_import\
 
419
                    (crt, ctypes.byref(datum),
 
420
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
421
    # Verify the self signature in the key
 
422
    crtverify = ctypes.c_uint()
 
423
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
 
424
        (crt, 0, ctypes.byref(crtverify))
 
425
    if crtverify.value != 0:
 
426
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
427
        raise gnutls.errors.CertificateSecurityError("Verify failed")
413
428
    # New buffer for the fingerprint
414
 
    buffer = ctypes.create_string_buffer(20)
415
 
    buffer_length = ctypes.c_size_t()
 
429
    buf = ctypes.create_string_buffer(20)
 
430
    buf_len = ctypes.c_size_t()
416
431
    # Get the fingerprint from the certificate into the buffer
417
432
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
418
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
433
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
419
434
    # Deinit the certificate
420
435
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
421
436
    # Convert the buffer to a Python bytestring
422
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
437
    fpr = ctypes.string_at(buf, buf_len.value)
423
438
    # Convert the bytestring to hexadecimal notation
424
439
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
425
440
    return hex_fpr
426
441
 
427
442
 
428
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
443
class TCP_handler(SocketServer.BaseRequestHandler, object):
429
444
    """A TCP request handler class.
430
445
    Instantiated by IPv6_TCPServer for each request to handle it.
431
446
    Note: This will run in its own forked process."""
432
447
    
433
448
    def handle(self):
434
 
        logger.debug(u"TCP connection from: %s",
 
449
        logger.info(u"TCP connection from: %s",
435
450
                     unicode(self.client_address))
436
 
 
437
 
        line = self.socket.makefile().readline()
 
451
        session = gnutls.connection.ClientSession\
 
452
                  (self.request, gnutls.connection.X509Credentials())
 
453
        
 
454
        line = self.request.makefile().readline()
 
455
        logger.debug(u"Protocol version: %r", line)
438
456
        try:
439
457
            if int(line.strip().split()[0]) > 1:
440
458
                raise RuntimeError
442
460
            logger.error(u"Unknown protocol version: %s", error)
443
461
            return
444
462
        
445
 
        session = gnutls.connection.ClientSession\
446
 
                  (self.request, gnutls.connection.X509Credentials())
447
463
        # Note: gnutls.connection.X509Credentials is really a generic
448
464
        # GnuTLS certificate credentials object so long as no X.509
449
465
        # keys are added to it.  Therefore, we can use it here despite
457
473
        if self.server.settings["priority"]:
458
474
            priority = self.server.settings["priority"]
459
475
        gnutls.library.functions.gnutls_priority_set_direct\
460
 
            (session._c_object, priority, None);
 
476
            (session._c_object, priority, None)
461
477
        
462
478
        try:
463
479
            session.handshake()
464
480
        except gnutls.errors.GNUTLSError, error:
465
 
            logger.debug(u"Handshake failed: %s", error)
 
481
            logger.warning(u"Handshake failed: %s", error)
466
482
            # Do not run session.bye() here: the session is not
467
483
            # established.  Just abandon the request.
468
484
            return
469
485
        try:
470
486
            fpr = fingerprint(peer_certificate(session))
471
487
        except (TypeError, gnutls.errors.GNUTLSError), error:
472
 
            logger.debug(u"Bad certificate: %s", error)
 
488
            logger.warning(u"Bad certificate: %s", error)
473
489
            session.bye()
474
490
            return
475
491
        logger.debug(u"Fingerprint: %s", fpr)
479
495
                client = c
480
496
                break
481
497
        if not client:
482
 
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
498
            logger.warning(u"Client not found for fingerprint: %s",
 
499
                           fpr)
483
500
            session.bye()
484
501
            return
485
502
        # Have to check if client.still_valid(), since it is possible
486
503
        # that the client timed out while establishing the GnuTLS
487
504
        # session.
488
505
        if not client.still_valid():
489
 
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
506
            logger.warning(u"Client %(name)s is invalid",
 
507
                           vars(client))
490
508
            session.bye()
491
509
            return
492
510
        sent_size = 0
504
522
    Attributes:
505
523
        settings:       Server settings
506
524
        clients:        Set() of Client objects
 
525
        enabled:        Boolean; whether this server is activated yet
507
526
    """
508
527
    address_family = socket.AF_INET6
509
528
    def __init__(self, *args, **kwargs):
513
532
        if "clients" in kwargs:
514
533
            self.clients = kwargs["clients"]
515
534
            del kwargs["clients"]
516
 
        return super(type(self), self).__init__(*args, **kwargs)
 
535
        self.enabled = False
 
536
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
517
537
    def server_bind(self):
518
538
        """This overrides the normal server_bind() function
519
539
        to bind to an interface if one was specified, and also NOT to
527
547
                                       self.settings["interface"])
528
548
            except socket.error, error:
529
549
                if error[0] == errno.EPERM:
530
 
                    logger.warning(u"No permission to"
531
 
                                   u" bind to interface %s",
532
 
                                   self.settings["interface"])
 
550
                    logger.error(u"No permission to"
 
551
                                 u" bind to interface %s",
 
552
                                 self.settings["interface"])
533
553
                else:
534
554
                    raise error
535
555
        # Only bind(2) the socket if we really need to.
538
558
                in6addr_any = "::"
539
559
                self.server_address = (in6addr_any,
540
560
                                       self.server_address[1])
541
 
            elif self.server_address[1] is None:
 
561
            elif not self.server_address[1]:
542
562
                self.server_address = (self.server_address[0],
543
563
                                       0)
544
 
            return super(type(self), self).server_bind()
 
564
#                 if self.settings["interface"]:
 
565
#                     self.server_address = (self.server_address[0],
 
566
#                                            0, # port
 
567
#                                            0, # flowinfo
 
568
#                                            if_nametoindex
 
569
#                                            (self.settings
 
570
#                                             ["interface"]))
 
571
            return super(IPv6_TCPServer, self).server_bind()
 
572
    def server_activate(self):
 
573
        if self.enabled:
 
574
            return super(IPv6_TCPServer, self).server_activate()
 
575
    def enable(self):
 
576
        self.enabled = True
545
577
 
546
578
 
547
579
def string_to_delta(interval):
557
589
    datetime.timedelta(1)
558
590
    >>> string_to_delta(u'1w')
559
591
    datetime.timedelta(7)
 
592
    >>> string_to_delta('5m 30s')
 
593
    datetime.timedelta(0, 330)
560
594
    """
561
 
    try:
562
 
        suffix=unicode(interval[-1])
563
 
        value=int(interval[:-1])
564
 
        if suffix == u"d":
565
 
            delta = datetime.timedelta(value)
566
 
        elif suffix == u"s":
567
 
            delta = datetime.timedelta(0, value)
568
 
        elif suffix == u"m":
569
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
570
 
        elif suffix == u"h":
571
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
572
 
        elif suffix == u"w":
573
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
574
 
        else:
 
595
    timevalue = datetime.timedelta(0)
 
596
    for s in interval.split():
 
597
        try:
 
598
            suffix = unicode(s[-1])
 
599
            value = int(s[:-1])
 
600
            if suffix == u"d":
 
601
                delta = datetime.timedelta(value)
 
602
            elif suffix == u"s":
 
603
                delta = datetime.timedelta(0, value)
 
604
            elif suffix == u"m":
 
605
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
606
            elif suffix == u"h":
 
607
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
608
            elif suffix == u"w":
 
609
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
610
            else:
 
611
                raise ValueError
 
612
        except (ValueError, IndexError):
575
613
            raise ValueError
576
 
    except (ValueError, IndexError):
577
 
        raise ValueError
578
 
    return delta
 
614
        timevalue += delta
 
615
    return timevalue
579
616
 
580
617
 
581
618
def server_state_changed(state):
582
619
    """Derived from the Avahi example code"""
583
620
    if state == avahi.SERVER_COLLISION:
584
 
        logger.warning(u"Server name collision")
 
621
        logger.error(u"Zeroconf server name collision")
585
622
        service.remove()
586
623
    elif state == avahi.SERVER_RUNNING:
587
624
        service.add()
589
626
 
590
627
def entry_group_state_changed(state, error):
591
628
    """Derived from the Avahi example code"""
592
 
    logger.debug(u"state change: %i", state)
 
629
    logger.debug(u"Avahi state change: %i", state)
593
630
    
594
631
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
595
 
        logger.debug(u"Service established.")
 
632
        logger.debug(u"Zeroconf service established.")
596
633
    elif state == avahi.ENTRY_GROUP_COLLISION:
597
 
        logger.warning(u"Service name collision.")
 
634
        logger.warning(u"Zeroconf service name collision.")
598
635
        service.rename()
599
636
    elif state == avahi.ENTRY_GROUP_FAILURE:
600
 
        logger.critical(u"Error in group state changed %s",
 
637
        logger.critical(u"Avahi: Error in group state changed %s",
601
638
                        unicode(error))
602
639
        raise AvahiGroupError("State changed: %s", str(error))
603
640
 
604
 
def if_nametoindex(interface, _func=[None]):
 
641
def if_nametoindex(interface):
605
642
    """Call the C function if_nametoindex(), or equivalent"""
606
 
    if _func[0] is not None:
607
 
        return _func[0](interface)
 
643
    global if_nametoindex
608
644
    try:
609
 
        if "ctypes.util" not in sys.modules:
610
 
            import ctypes.util
611
 
        while True:
612
 
            try:
613
 
                libc = ctypes.cdll.LoadLibrary\
614
 
                       (ctypes.util.find_library("c"))
615
 
                _func[0] = libc.if_nametoindex
616
 
                return _func[0](interface)
617
 
            except IOError, e:
618
 
                if e != errno.EINTR:
619
 
                    raise
 
645
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
646
            (ctypes.util.find_library("c")).if_nametoindex
620
647
    except (OSError, AttributeError):
621
648
        if "struct" not in sys.modules:
622
649
            import struct
623
650
        if "fcntl" not in sys.modules:
624
651
            import fcntl
625
 
        def the_hard_way(interface):
 
652
        def if_nametoindex(interface):
626
653
            "Get an interface index the hard way, i.e. using fcntl()"
627
654
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
628
655
            s = socket.socket()
631
658
            s.close()
632
659
            interface_index = struct.unpack("I", ifreq[16:20])[0]
633
660
            return interface_index
634
 
        _func[0] = the_hard_way
635
 
        return _func[0](interface)
636
 
 
637
 
 
638
 
def daemon(nochdir, noclose):
 
661
    return if_nametoindex(interface)
 
662
 
 
663
 
 
664
def daemon(nochdir = False, noclose = False):
639
665
    """See daemon(3).  Standard BSD Unix function.
640
666
    This should really exist as os.daemon, but it doesn't (yet)."""
641
667
    if os.fork():
643
669
    os.setsid()
644
670
    if not nochdir:
645
671
        os.chdir("/")
 
672
    if os.fork():
 
673
        sys.exit()
646
674
    if not noclose:
647
675
        # Close all standard open file descriptors
648
676
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
657
685
 
658
686
 
659
687
def main():
660
 
    global main_loop_started
661
 
    main_loop_started = False
662
 
    
663
 
    parser = OptionParser()
 
688
    parser = OptionParser(version = "%%prog %s" % version)
664
689
    parser.add_option("-i", "--interface", type="string",
665
690
                      metavar="IF", help="Bind to interface IF")
666
691
    parser.add_option("-a", "--address", type="string",
669
694
                      help="Port number to receive requests on")
670
695
    parser.add_option("--check", action="store_true", default=False,
671
696
                      help="Run self-test")
672
 
    parser.add_option("--debug", action="store_true", default=False,
 
697
    parser.add_option("--debug", action="store_true",
673
698
                      help="Debug mode; run in foreground and log to"
674
699
                      " terminal")
675
700
    parser.add_option("--priority", type="string", help="GnuTLS"
680
705
                      default="/etc/mandos", metavar="DIR",
681
706
                      help="Directory to search for configuration"
682
707
                      " files")
683
 
    (options, args) = parser.parse_args()
 
708
    options = parser.parse_args()[0]
684
709
    
685
710
    if options.check:
686
711
        import doctest
700
725
    # Parse config file for server-global settings
701
726
    server_config = ConfigParser.SafeConfigParser(server_defaults)
702
727
    del server_defaults
703
 
    server_config.read(os.path.join(options.configdir, "server.conf"))
704
 
    server_section = "server"
 
728
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
705
729
    # Convert the SafeConfigParser object to a dict
706
 
    server_settings = dict(server_config.items(server_section))
 
730
    server_settings = server_config.defaults()
707
731
    # Use getboolean on the boolean config option
708
732
    server_settings["debug"] = server_config.getboolean\
709
 
                               (server_section, "debug")
 
733
                               ("DEFAULT", "debug")
710
734
    del server_config
711
735
    
712
736
    # Override the settings from the config file with command line
719
743
    del options
720
744
    # Now we have our good server settings in "server_settings"
721
745
    
 
746
    debug = server_settings["debug"]
 
747
    
 
748
    if not debug:
 
749
        syslogger.setLevel(logging.WARNING)
 
750
        console.setLevel(logging.WARNING)
 
751
    
 
752
    if server_settings["servicename"] != "Mandos":
 
753
        syslogger.setFormatter(logging.Formatter\
 
754
                               ('Mandos (%s): %%(levelname)s:'
 
755
                                ' %%(message)s'
 
756
                                % server_settings["servicename"]))
 
757
    
722
758
    # Parse config file with clients
723
759
    client_defaults = { "timeout": "1h",
724
760
                        "interval": "5m",
725
 
                        "checker": "fping -q -- %%(fqdn)s",
 
761
                        "checker": "fping -q -- %(host)s",
 
762
                        "host": "",
726
763
                        }
727
764
    client_config = ConfigParser.SafeConfigParser(client_defaults)
728
765
    client_config.read(os.path.join(server_settings["configdir"],
729
766
                                    "clients.conf"))
730
767
    
 
768
    clients = Set()
 
769
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
770
                                 server_settings["port"]),
 
771
                                TCP_handler,
 
772
                                settings=server_settings,
 
773
                                clients=clients)
 
774
    pidfilename = "/var/run/mandos.pid"
 
775
    try:
 
776
        pidfile = open(pidfilename, "w")
 
777
    except IOError, error:
 
778
        logger.error("Could not open file %r", pidfilename)
 
779
    
 
780
    uid = 65534
 
781
    gid = 65534
 
782
    try:
 
783
        uid = pwd.getpwnam("mandos").pw_uid
 
784
    except KeyError:
 
785
        try:
 
786
            uid = pwd.getpwnam("nobody").pw_uid
 
787
        except KeyError:
 
788
            pass
 
789
    try:
 
790
        gid = pwd.getpwnam("mandos").pw_gid
 
791
    except KeyError:
 
792
        try:
 
793
            gid = pwd.getpwnam("nogroup").pw_gid
 
794
        except KeyError:
 
795
            pass
 
796
    try:
 
797
        os.setuid(uid)
 
798
        os.setgid(gid)
 
799
    except OSError, error:
 
800
        if error[0] != errno.EPERM:
 
801
            raise error
 
802
    
731
803
    global service
732
804
    service = AvahiService(name = server_settings["servicename"],
733
 
                           type = "_mandos._tcp", );
 
805
                           servicetype = "_mandos._tcp", )
734
806
    if server_settings["interface"]:
735
 
        service.interface = if_nametoindex(server_settings["interface"])
 
807
        service.interface = if_nametoindex\
 
808
                            (server_settings["interface"])
736
809
    
737
810
    global main_loop
738
811
    global bus
741
814
    DBusGMainLoop(set_as_default=True )
742
815
    main_loop = gobject.MainLoop()
743
816
    bus = dbus.SystemBus()
744
 
    server = dbus.Interface(
745
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
746
 
            avahi.DBUS_INTERFACE_SERVER )
 
817
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
818
                                           avahi.DBUS_PATH_SERVER),
 
819
                            avahi.DBUS_INTERFACE_SERVER)
747
820
    # End of Avahi example code
748
821
    
749
 
    debug = server_settings["debug"]
750
 
    
751
 
    if debug:
752
 
        console = logging.StreamHandler()
753
 
        # console.setLevel(logging.DEBUG)
754
 
        console.setFormatter(logging.Formatter\
755
 
                             ('%(levelname)s: %(message)s'))
756
 
        logger.addHandler(console)
757
 
        del console
758
 
    
759
 
    clients = Set()
760
822
    def remove_from_clients(client):
761
823
        clients.remove(client)
762
824
        if not clients:
763
 
            logger.debug(u"No clients left, exiting")
 
825
            logger.critical(u"No clients left, exiting")
764
826
            sys.exit()
765
827
    
766
 
    clients.update(Set(Client(name=section,
 
828
    clients.update(Set(Client(name = section,
767
829
                              stop_hook = remove_from_clients,
768
 
                              **(dict(client_config\
769
 
                                      .items(section))))
 
830
                              config
 
831
                              = dict(client_config.items(section)))
770
832
                       for section in client_config.sections()))
771
 
    
772
 
    if not debug:
773
 
        daemon(False, False)
 
833
    if not clients:
 
834
        logger.critical(u"No clients defined")
 
835
        sys.exit(1)
 
836
    
 
837
    if debug:
 
838
        # Redirect stdin so all checkers get /dev/null
 
839
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
840
        os.dup2(null, sys.stdin.fileno())
 
841
        if null > 2:
 
842
            os.close(null)
 
843
    else:
 
844
        # No console logging
 
845
        logger.removeHandler(console)
 
846
        # Close all input and output, do double fork, etc.
 
847
        daemon()
 
848
    
 
849
    try:
 
850
        pid = os.getpid()
 
851
        pidfile.write(str(pid) + "\n")
 
852
        pidfile.close()
 
853
        del pidfile
 
854
    except IOError:
 
855
        logger.error(u"Could not write to file %r with PID %d",
 
856
                     pidfilename, pid)
 
857
    except NameError:
 
858
        # "pidfile" was never created
 
859
        pass
 
860
    del pidfilename
774
861
    
775
862
    def cleanup():
776
863
        "Cleanup function; run on exit"
796
883
    for client in clients:
797
884
        client.start()
798
885
    
799
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
800
 
                                 server_settings["port"]),
801
 
                                tcp_handler,
802
 
                                settings=server_settings,
803
 
                                clients=clients)
 
886
    tcp_server.enable()
 
887
    tcp_server.server_activate()
 
888
    
804
889
    # Find out what port we got
805
890
    service.port = tcp_server.socket.getsockname()[1]
806
 
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
807
 
                 u" scope_id %d" % tcp_server.socket.getsockname())
 
891
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
892
                u" scope_id %d" % tcp_server.socket.getsockname())
808
893
    
809
894
    #service.interface = tcp_server.socket.getsockname()[3]
810
895
    
823
908
                             tcp_server.handle_request\
824
909
                             (*args[2:], **kwargs) or True)
825
910
        
826
 
        logger.debug("Starting main loop")
827
 
        main_loop_started = True
 
911
        logger.debug(u"Starting main loop")
828
912
        main_loop.run()
829
913
    except AvahiError, error:
830
914
        logger.critical(u"AvahiError: %s" + unicode(error))