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  • Committer: Teddy Hogeborn
  • Date: 2008-10-18 11:17:22 UTC
  • Revision ID: teddy@fukt.bsnet.se-20081018111722-jtbz35c031lxuuc9
* debian/mandos-client.docs (NEWS): Added.
* debian/mandos.docs (NEWS): - '' -

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Lines of Context:
mandos
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# This program is partly derived from an example program for an Avahi
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# service publisher, downloaded from
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# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
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# 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
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# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
14
# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
15
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# 
16
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# This program is free software: you can redistribute it and/or modify
17
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# 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
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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
55
import logging
56
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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
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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 = "1.0.2"
75
67
 
76
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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
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                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
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                        _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
451
        session = gnutls.connection.ClientSession\
437
452
                  (self.request, gnutls.connection.X509Credentials())
458
473
        if self.server.settings["priority"]:
459
474
            priority = self.server.settings["priority"]
460
475
        gnutls.library.functions.gnutls_priority_set_direct\
461
 
            (session._c_object, priority, None);
 
476
            (session._c_object, priority, None)
462
477
        
463
478
        try:
464
479
            session.handshake()
465
480
        except gnutls.errors.GNUTLSError, error:
466
 
            logger.debug(u"Handshake failed: %s", error)
 
481
            logger.warning(u"Handshake failed: %s", error)
467
482
            # Do not run session.bye() here: the session is not
468
483
            # established.  Just abandon the request.
469
484
            return
470
485
        try:
471
486
            fpr = fingerprint(peer_certificate(session))
472
487
        except (TypeError, gnutls.errors.GNUTLSError), error:
473
 
            logger.debug(u"Bad certificate: %s", error)
 
488
            logger.warning(u"Bad certificate: %s", error)
474
489
            session.bye()
475
490
            return
476
491
        logger.debug(u"Fingerprint: %s", fpr)
480
495
                client = c
481
496
                break
482
497
        if not client:
483
 
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
498
            logger.warning(u"Client not found for fingerprint: %s",
 
499
                           fpr)
484
500
            session.bye()
485
501
            return
486
502
        # Have to check if client.still_valid(), since it is possible
487
503
        # that the client timed out while establishing the GnuTLS
488
504
        # session.
489
505
        if not client.still_valid():
490
 
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
506
            logger.warning(u"Client %(name)s is invalid",
 
507
                           vars(client))
491
508
            session.bye()
492
509
            return
493
510
        sent_size = 0
505
522
    Attributes:
506
523
        settings:       Server settings
507
524
        clients:        Set() of Client objects
 
525
        enabled:        Boolean; whether this server is activated yet
508
526
    """
509
527
    address_family = socket.AF_INET6
510
528
    def __init__(self, *args, **kwargs):
514
532
        if "clients" in kwargs:
515
533
            self.clients = kwargs["clients"]
516
534
            del kwargs["clients"]
517
 
        return super(type(self), self).__init__(*args, **kwargs)
 
535
        self.enabled = False
 
536
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
518
537
    def server_bind(self):
519
538
        """This overrides the normal server_bind() function
520
539
        to bind to an interface if one was specified, and also NOT to
528
547
                                       self.settings["interface"])
529
548
            except socket.error, error:
530
549
                if error[0] == errno.EPERM:
531
 
                    logger.warning(u"No permission to"
532
 
                                   u" bind to interface %s",
533
 
                                   self.settings["interface"])
 
550
                    logger.error(u"No permission to"
 
551
                                 u" bind to interface %s",
 
552
                                 self.settings["interface"])
534
553
                else:
535
554
                    raise error
536
555
        # Only bind(2) the socket if we really need to.
539
558
                in6addr_any = "::"
540
559
                self.server_address = (in6addr_any,
541
560
                                       self.server_address[1])
542
 
            elif self.server_address[1] is None:
 
561
            elif not self.server_address[1]:
543
562
                self.server_address = (self.server_address[0],
544
563
                                       0)
545
 
            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
546
577
 
547
578
 
548
579
def string_to_delta(interval):
558
589
    datetime.timedelta(1)
559
590
    >>> string_to_delta(u'1w')
560
591
    datetime.timedelta(7)
 
592
    >>> string_to_delta('5m 30s')
 
593
    datetime.timedelta(0, 330)
561
594
    """
562
 
    try:
563
 
        suffix=unicode(interval[-1])
564
 
        value=int(interval[:-1])
565
 
        if suffix == u"d":
566
 
            delta = datetime.timedelta(value)
567
 
        elif suffix == u"s":
568
 
            delta = datetime.timedelta(0, value)
569
 
        elif suffix == u"m":
570
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
571
 
        elif suffix == u"h":
572
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
573
 
        elif suffix == u"w":
574
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
575
 
        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):
576
613
            raise ValueError
577
 
    except (ValueError, IndexError):
578
 
        raise ValueError
579
 
    return delta
 
614
        timevalue += delta
 
615
    return timevalue
580
616
 
581
617
 
582
618
def server_state_changed(state):
583
619
    """Derived from the Avahi example code"""
584
620
    if state == avahi.SERVER_COLLISION:
585
 
        logger.warning(u"Server name collision")
 
621
        logger.error(u"Zeroconf server name collision")
586
622
        service.remove()
587
623
    elif state == avahi.SERVER_RUNNING:
588
624
        service.add()
590
626
 
591
627
def entry_group_state_changed(state, error):
592
628
    """Derived from the Avahi example code"""
593
 
    logger.debug(u"state change: %i", state)
 
629
    logger.debug(u"Avahi state change: %i", state)
594
630
    
595
631
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
596
 
        logger.debug(u"Service established.")
 
632
        logger.debug(u"Zeroconf service established.")
597
633
    elif state == avahi.ENTRY_GROUP_COLLISION:
598
 
        logger.warning(u"Service name collision.")
 
634
        logger.warning(u"Zeroconf service name collision.")
599
635
        service.rename()
600
636
    elif state == avahi.ENTRY_GROUP_FAILURE:
601
 
        logger.critical(u"Error in group state changed %s",
 
637
        logger.critical(u"Avahi: Error in group state changed %s",
602
638
                        unicode(error))
603
639
        raise AvahiGroupError("State changed: %s", str(error))
604
640
 
606
642
    """Call the C function if_nametoindex(), or equivalent"""
607
643
    global if_nametoindex
608
644
    try:
609
 
        if "ctypes.util" not in sys.modules:
610
 
            import ctypes.util
611
645
        if_nametoindex = ctypes.cdll.LoadLibrary\
612
646
            (ctypes.util.find_library("c")).if_nametoindex
613
647
    except (OSError, AttributeError):
627
661
    return if_nametoindex(interface)
628
662
 
629
663
 
630
 
def daemon(nochdir, noclose):
 
664
def daemon(nochdir = False, noclose = False):
631
665
    """See daemon(3).  Standard BSD Unix function.
632
666
    This should really exist as os.daemon, but it doesn't (yet)."""
633
667
    if os.fork():
635
669
    os.setsid()
636
670
    if not nochdir:
637
671
        os.chdir("/")
 
672
    if os.fork():
 
673
        sys.exit()
638
674
    if not noclose:
639
675
        # Close all standard open file descriptors
640
676
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
649
685
 
650
686
 
651
687
def main():
652
 
    global main_loop_started
653
 
    main_loop_started = False
654
 
    
655
 
    parser = OptionParser()
 
688
    parser = OptionParser(version = "%%prog %s" % version)
656
689
    parser.add_option("-i", "--interface", type="string",
657
690
                      metavar="IF", help="Bind to interface IF")
658
691
    parser.add_option("-a", "--address", type="string",
661
694
                      help="Port number to receive requests on")
662
695
    parser.add_option("--check", action="store_true", default=False,
663
696
                      help="Run self-test")
664
 
    parser.add_option("--debug", action="store_true", default=False,
 
697
    parser.add_option("--debug", action="store_true",
665
698
                      help="Debug mode; run in foreground and log to"
666
699
                      " terminal")
667
700
    parser.add_option("--priority", type="string", help="GnuTLS"
672
705
                      default="/etc/mandos", metavar="DIR",
673
706
                      help="Directory to search for configuration"
674
707
                      " files")
675
 
    (options, args) = parser.parse_args()
 
708
    options = parser.parse_args()[0]
676
709
    
677
710
    if options.check:
678
711
        import doctest
692
725
    # Parse config file for server-global settings
693
726
    server_config = ConfigParser.SafeConfigParser(server_defaults)
694
727
    del server_defaults
695
 
    server_config.read(os.path.join(options.configdir, "server.conf"))
696
 
    server_section = "server"
 
728
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
697
729
    # Convert the SafeConfigParser object to a dict
698
 
    server_settings = dict(server_config.items(server_section))
 
730
    server_settings = server_config.defaults()
699
731
    # Use getboolean on the boolean config option
700
732
    server_settings["debug"] = server_config.getboolean\
701
 
                               (server_section, "debug")
 
733
                               ("DEFAULT", "debug")
702
734
    del server_config
703
735
    
704
736
    # Override the settings from the config file with command line
711
743
    del options
712
744
    # Now we have our good server settings in "server_settings"
713
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
    
714
758
    # Parse config file with clients
715
759
    client_defaults = { "timeout": "1h",
716
760
                        "interval": "5m",
717
 
                        "checker": "fping -q -- %%(fqdn)s",
 
761
                        "checker": "fping -q -- %(host)s",
 
762
                        "host": "",
718
763
                        }
719
764
    client_config = ConfigParser.SafeConfigParser(client_defaults)
720
765
    client_config.read(os.path.join(server_settings["configdir"],
721
766
                                    "clients.conf"))
722
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
    
723
803
    global service
724
804
    service = AvahiService(name = server_settings["servicename"],
725
 
                           type = "_mandos._tcp", );
 
805
                           servicetype = "_mandos._tcp", )
726
806
    if server_settings["interface"]:
727
 
        service.interface = if_nametoindex(server_settings["interface"])
 
807
        service.interface = if_nametoindex\
 
808
                            (server_settings["interface"])
728
809
    
729
810
    global main_loop
730
811
    global bus
733
814
    DBusGMainLoop(set_as_default=True )
734
815
    main_loop = gobject.MainLoop()
735
816
    bus = dbus.SystemBus()
736
 
    server = dbus.Interface(
737
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
738
 
            avahi.DBUS_INTERFACE_SERVER )
 
817
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
818
                                           avahi.DBUS_PATH_SERVER),
 
819
                            avahi.DBUS_INTERFACE_SERVER)
739
820
    # End of Avahi example code
740
821
    
741
 
    debug = server_settings["debug"]
742
 
    
743
 
    if debug:
744
 
        console = logging.StreamHandler()
745
 
        # console.setLevel(logging.DEBUG)
746
 
        console.setFormatter(logging.Formatter\
747
 
                             ('%(levelname)s: %(message)s'))
748
 
        logger.addHandler(console)
749
 
        del console
750
 
    
751
 
    clients = Set()
752
822
    def remove_from_clients(client):
753
823
        clients.remove(client)
754
824
        if not clients:
755
 
            logger.debug(u"No clients left, exiting")
 
825
            logger.critical(u"No clients left, exiting")
756
826
            sys.exit()
757
827
    
758
 
    clients.update(Set(Client(name=section,
 
828
    clients.update(Set(Client(name = section,
759
829
                              stop_hook = remove_from_clients,
760
 
                              **(dict(client_config\
761
 
                                      .items(section))))
 
830
                              config
 
831
                              = dict(client_config.items(section)))
762
832
                       for section in client_config.sections()))
763
 
    
764
 
    if not debug:
765
 
        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
766
861
    
767
862
    def cleanup():
768
863
        "Cleanup function; run on exit"
788
883
    for client in clients:
789
884
        client.start()
790
885
    
791
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
792
 
                                 server_settings["port"]),
793
 
                                tcp_handler,
794
 
                                settings=server_settings,
795
 
                                clients=clients)
 
886
    tcp_server.enable()
 
887
    tcp_server.server_activate()
 
888
    
796
889
    # Find out what port we got
797
890
    service.port = tcp_server.socket.getsockname()[1]
798
 
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
799
 
                 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())
800
893
    
801
894
    #service.interface = tcp_server.socket.getsockname()[3]
802
895
    
815
908
                             tcp_server.handle_request\
816
909
                             (*args[2:], **kwargs) or True)
817
910
        
818
 
        logger.debug("Starting main loop")
819
 
        main_loop_started = True
 
911
        logger.debug(u"Starting main loop")
820
912
        main_loop.run()
821
913
    except AvahiError, error:
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        logger.critical(u"AvahiError: %s" + unicode(error))