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  • Committer: Teddy Hogeborn
  • Date: 2008-07-31 19:51:44 UTC
  • mfrom: (24.1.5 mandos)
  • Revision ID: teddy@fukt.bsnet.se-20080731195144-yb37wz2sr1e6b3m4
Merge.

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server.py
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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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# 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".
 
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# following functions: "AvahiService.add", "AvahiService.remove",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
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# 
13
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# Everything else is
14
 
# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
 
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# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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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
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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
28
 
# <http://www.gnu.org/licenses/>.
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
29
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# 
30
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# Contact the authors at <mandos@fukt.bsnet.se>.
31
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# 
34
33
 
35
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import SocketServer
36
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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
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import logging.handlers
57
 
import pwd
58
57
 
59
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import dbus
60
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import gobject
61
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import avahi
62
61
from dbus.mainloop.glib import DBusGMainLoop
63
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import ctypes
64
 
import ctypes.util
65
 
 
66
 
version = "1.0.2"
 
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
 
67
75
 
68
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logger = logging.Logger('mandos')
69
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syslogger = logging.handlers.SysLogHandler\
70
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
 
             address = "/dev/log")
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
72
79
syslogger.setFormatter(logging.Formatter\
73
 
                        ('Mandos: %(levelname)s: %(message)s'))
 
80
                        ('%(levelname)s: %(message)s'))
74
81
logger.addHandler(syslogger)
 
82
del syslogger
75
83
 
76
 
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
 
                                       ' %(message)s'))
79
 
logger.addHandler(console)
80
84
 
81
85
class AvahiError(Exception):
82
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    def __init__(self, value):
83
87
        self.value = value
84
 
        super(AvahiError, self).__init__()
85
88
    def __str__(self):
86
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        return repr(self.value)
87
90
 
93
96
 
94
97
 
95
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class AvahiService(object):
96
 
    """An Avahi (Zeroconf) service.
97
 
    Attributes:
 
99
    """
98
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
99
101
               Used to optionally bind to the specified interface.
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
 
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
110
113
    """
111
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
112
 
                 servicetype = None, port = None, TXT = None, domain = "",
113
 
                 host = "", max_renames = 32768):
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
114
118
        self.interface = interface
115
119
        self.name = name
116
 
        self.type = servicetype
 
120
        self.type = type
117
121
        self.port = port
118
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        if TXT is None:
119
123
            self.TXT = []
122
126
        self.domain = domain
123
127
        self.host = host
124
128
        self.rename_count = 0
125
 
        self.max_renames = max_renames
126
129
    def rename(self):
127
130
        """Derived from the Avahi example code"""
128
131
        if self.rename_count >= self.max_renames:
129
 
            logger.critical(u"No suitable Zeroconf service name found"
130
 
                            u" after %i retries, exiting.",
131
 
                            self.rename_count)
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
132
134
            raise AvahiServiceError("Too many renames")
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))
 
135
        name = server.GetAlternativeServiceName(name)
 
136
        logger.notice(u"Changing name to %r ...", name)
139
137
        self.remove()
140
138
        self.add()
141
139
        self.rename_count += 1
153
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
152
            group.connect_to_signal('StateChanged',
155
153
                                    entry_group_state_changed)
156
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
157
155
                     service.name, service.type)
158
156
        group.AddService(
159
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                self.interface,         # interface
177
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
178
176
                 uniquely identify the client
179
177
    secret:    bytestring; sent verbatim (over TLS) to client
180
 
    host:      string; available for use by the checker command
 
178
    fqdn:      string (FQDN); available for use by the checker command
181
179
    created:   datetime.datetime(); object creation, not client host
182
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
183
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
223
221
    interval = property(lambda self: self._interval,
224
222
                        _set_interval)
225
223
    del _set_interval
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 = {}
 
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.."""
232
229
        self.name = name
233
230
        logger.debug(u"Creating client %r", self.name)
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"")
 
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"")
239
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
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()
 
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()
247
242
        else:
248
243
            raise TypeError(u"No secret or secfile for client %s"
249
244
                            % self.name)
250
 
        self.host = config.get("host", "")
 
245
        self.fqdn = fqdn
251
246
        self.created = datetime.datetime.now()
252
247
        self.last_checked_ok = None
253
 
        self.timeout = string_to_delta(config["timeout"])
254
 
        self.interval = string_to_delta(config["interval"])
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
255
250
        self.stop_hook = stop_hook
256
251
        self.checker = None
257
252
        self.checker_initiator_tag = None
258
253
        self.stop_initiator_tag = None
259
254
        self.checker_callback_tag = None
260
 
        self.check_command = config["checker"]
 
255
        self.check_command = checker
261
256
    def start(self):
262
257
        """Start this client's checker and timeout hooks"""
263
258
        # Schedule a new checker to be started an 'interval' from now,
276
271
        The possibility that a client might be restarted is left open,
277
272
        but not currently used."""
278
273
        # If this client doesn't have a secret, it is already stopped.
279
 
        if hasattr(self, "secret") and self.secret:
280
 
            logger.info(u"Stopping client %s", self.name)
 
274
        if self.secret:
 
275
            logger.debug(u"Stopping client %s", self.name)
281
276
            self.secret = None
282
277
        else:
283
278
            return False
302
297
        self.checker = None
303
298
        if os.WIFEXITED(condition) \
304
299
               and (os.WEXITSTATUS(condition) == 0):
305
 
            logger.info(u"Checker for %(name)s succeeded",
306
 
                        vars(self))
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
307
302
            self.last_checked_ok = now
308
303
            gobject.source_remove(self.stop_initiator_tag)
309
304
            self.stop_initiator_tag = gobject.timeout_add\
313
308
            logger.warning(u"Checker for %(name)s crashed?",
314
309
                           vars(self))
315
310
        else:
316
 
            logger.info(u"Checker for %(name)s failed",
317
 
                        vars(self))
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
318
313
    def start_checker(self):
319
314
        """Start a new checker subprocess if one is not running.
320
315
        If a checker already exists, leave it running and do
330
325
        if self.checker is None:
331
326
            try:
332
327
                # In case check_command has exactly one % operator
333
 
                command = self.check_command % self.host
 
328
                command = self.check_command % self.fqdn
334
329
            except TypeError:
335
330
                # Escape attributes for the shell
336
331
                escaped_attrs = dict((key, re.escape(str(val)))
343
338
                                 u' %s', self.check_command, error)
344
339
                    return True # Try again later
345
340
            try:
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.)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
352
343
                self.checker = subprocess.Popen(command,
353
344
                                                close_fds=True,
354
345
                                                shell=True, cwd="/")
355
346
                self.checker_callback_tag = gobject.child_watch_add\
356
347
                                            (self.checker.pid,
357
348
                                             self.checker_callback)
358
 
            except OSError, error:
 
349
            except subprocess.OSError, error:
359
350
                logger.error(u"Failed to start subprocess: %s",
360
351
                             error)
361
352
        # Re-run this periodically if run by gobject.timeout_add
367
358
            self.checker_callback_tag = None
368
359
        if getattr(self, "checker", None) is None:
369
360
            return
370
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
361
        logger.debug("Stopping checker for %(name)s", vars(self))
371
362
        try:
372
363
            os.kill(self.checker.pid, signal.SIGTERM)
373
364
            #os.sleep(0.5)
405
396
 
406
397
def fingerprint(openpgp):
407
398
    "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))
408
403
    # New GnuTLS "datum" with the OpenPGP public key
409
404
    datum = gnutls.library.types.gnutls_datum_t\
410
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
411
406
                     ctypes.POINTER(ctypes.c_ubyte)),
412
407
         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))
417
408
    # Import the OpenPGP public key into the certificate
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")
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
428
413
    # New buffer for the fingerprint
429
 
    buf = ctypes.create_string_buffer(20)
430
 
    buf_len = ctypes.c_size_t()
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
431
416
    # Get the fingerprint from the certificate into the buffer
432
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
433
 
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
434
419
    # Deinit the certificate
435
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
436
421
    # Convert the buffer to a Python bytestring
437
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
438
423
    # Convert the bytestring to hexadecimal notation
439
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
440
425
    return hex_fpr
441
426
 
442
427
 
443
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
444
429
    """A TCP request handler class.
445
430
    Instantiated by IPv6_TCPServer for each request to handle it.
446
431
    Note: This will run in its own forked process."""
447
432
    
448
433
    def handle(self):
449
 
        logger.info(u"TCP connection from: %s",
 
434
        logger.debug(u"TCP connection from: %s",
450
435
                     unicode(self.client_address))
451
436
        session = gnutls.connection.ClientSession\
452
437
                  (self.request, gnutls.connection.X509Credentials())
453
 
        
454
 
        line = self.request.makefile().readline()
455
 
        logger.debug(u"Protocol version: %r", line)
456
 
        try:
457
 
            if int(line.strip().split()[0]) > 1:
458
 
                raise RuntimeError
459
 
        except (ValueError, IndexError, RuntimeError), error:
460
 
            logger.error(u"Unknown protocol version: %s", error)
461
 
            return
462
 
        
463
438
        # Note: gnutls.connection.X509Credentials is really a generic
464
439
        # GnuTLS certificate credentials object so long as no X.509
465
440
        # keys are added to it.  Therefore, we can use it here despite
473
448
        if self.server.settings["priority"]:
474
449
            priority = self.server.settings["priority"]
475
450
        gnutls.library.functions.gnutls_priority_set_direct\
476
 
            (session._c_object, priority, None)
 
451
            (session._c_object, priority, None);
477
452
        
478
453
        try:
479
454
            session.handshake()
480
455
        except gnutls.errors.GNUTLSError, error:
481
 
            logger.warning(u"Handshake failed: %s", error)
 
456
            logger.debug(u"Handshake failed: %s", error)
482
457
            # Do not run session.bye() here: the session is not
483
458
            # established.  Just abandon the request.
484
459
            return
485
460
        try:
486
461
            fpr = fingerprint(peer_certificate(session))
487
462
        except (TypeError, gnutls.errors.GNUTLSError), error:
488
 
            logger.warning(u"Bad certificate: %s", error)
 
463
            logger.debug(u"Bad certificate: %s", error)
489
464
            session.bye()
490
465
            return
491
466
        logger.debug(u"Fingerprint: %s", fpr)
495
470
                client = c
496
471
                break
497
472
        if not client:
498
 
            logger.warning(u"Client not found for fingerprint: %s",
499
 
                           fpr)
 
473
            logger.debug(u"Client not found for fingerprint: %s", fpr)
500
474
            session.bye()
501
475
            return
502
476
        # Have to check if client.still_valid(), since it is possible
503
477
        # that the client timed out while establishing the GnuTLS
504
478
        # session.
505
479
        if not client.still_valid():
506
 
            logger.warning(u"Client %(name)s is invalid",
507
 
                           vars(client))
 
480
            logger.debug(u"Client %(name)s is invalid", vars(client))
508
481
            session.bye()
509
482
            return
510
483
        sent_size = 0
522
495
    Attributes:
523
496
        settings:       Server settings
524
497
        clients:        Set() of Client objects
525
 
        enabled:        Boolean; whether this server is activated yet
526
498
    """
527
499
    address_family = socket.AF_INET6
528
500
    def __init__(self, *args, **kwargs):
532
504
        if "clients" in kwargs:
533
505
            self.clients = kwargs["clients"]
534
506
            del kwargs["clients"]
535
 
        self.enabled = False
536
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
507
        return super(type(self), self).__init__(*args, **kwargs)
537
508
    def server_bind(self):
538
509
        """This overrides the normal server_bind() function
539
510
        to bind to an interface if one was specified, and also NOT to
547
518
                                       self.settings["interface"])
548
519
            except socket.error, error:
549
520
                if error[0] == errno.EPERM:
550
 
                    logger.error(u"No permission to"
551
 
                                 u" bind to interface %s",
552
 
                                 self.settings["interface"])
 
521
                    logger.warning(u"No permission to"
 
522
                                   u" bind to interface %s",
 
523
                                   self.settings["interface"])
553
524
                else:
554
525
                    raise error
555
526
        # Only bind(2) the socket if we really need to.
558
529
                in6addr_any = "::"
559
530
                self.server_address = (in6addr_any,
560
531
                                       self.server_address[1])
561
 
            elif not self.server_address[1]:
 
532
            elif self.server_address[1] is None:
562
533
                self.server_address = (self.server_address[0],
563
534
                                       0)
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
 
535
            return super(type(self), self).server_bind()
577
536
 
578
537
 
579
538
def string_to_delta(interval):
589
548
    datetime.timedelta(1)
590
549
    >>> string_to_delta(u'1w')
591
550
    datetime.timedelta(7)
592
 
    >>> string_to_delta('5m 30s')
593
 
    datetime.timedelta(0, 330)
594
551
    """
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):
 
552
    try:
 
553
        suffix=unicode(interval[-1])
 
554
        value=int(interval[:-1])
 
555
        if suffix == u"d":
 
556
            delta = datetime.timedelta(value)
 
557
        elif suffix == u"s":
 
558
            delta = datetime.timedelta(0, value)
 
559
        elif suffix == u"m":
 
560
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
561
        elif suffix == u"h":
 
562
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
563
        elif suffix == u"w":
 
564
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
565
        else:
613
566
            raise ValueError
614
 
        timevalue += delta
615
 
    return timevalue
 
567
    except (ValueError, IndexError):
 
568
        raise ValueError
 
569
    return delta
616
570
 
617
571
 
618
572
def server_state_changed(state):
619
573
    """Derived from the Avahi example code"""
620
574
    if state == avahi.SERVER_COLLISION:
621
 
        logger.error(u"Zeroconf server name collision")
 
575
        logger.warning(u"Server name collision")
622
576
        service.remove()
623
577
    elif state == avahi.SERVER_RUNNING:
624
578
        service.add()
626
580
 
627
581
def entry_group_state_changed(state, error):
628
582
    """Derived from the Avahi example code"""
629
 
    logger.debug(u"Avahi state change: %i", state)
 
583
    logger.debug(u"state change: %i", state)
630
584
    
631
585
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
632
 
        logger.debug(u"Zeroconf service established.")
 
586
        logger.debug(u"Service established.")
633
587
    elif state == avahi.ENTRY_GROUP_COLLISION:
634
 
        logger.warning(u"Zeroconf service name collision.")
 
588
        logger.warning(u"Service name collision.")
635
589
        service.rename()
636
590
    elif state == avahi.ENTRY_GROUP_FAILURE:
637
 
        logger.critical(u"Avahi: Error in group state changed %s",
 
591
        logger.critical(u"Error in group state changed %s",
638
592
                        unicode(error))
639
593
        raise AvahiGroupError("State changed: %s", str(error))
640
594
 
641
 
def if_nametoindex(interface):
 
595
def if_nametoindex(interface, _func=[None]):
642
596
    """Call the C function if_nametoindex(), or equivalent"""
643
 
    global if_nametoindex
 
597
    if _func[0] is not None:
 
598
        return _func[0](interface)
644
599
    try:
645
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
646
 
            (ctypes.util.find_library("c")).if_nametoindex
 
600
        if "ctypes.util" not in sys.modules:
 
601
            import ctypes.util
 
602
        while True:
 
603
            try:
 
604
                libc = ctypes.cdll.LoadLibrary\
 
605
                       (ctypes.util.find_library("c"))
 
606
                _func[0] = libc.if_nametoindex
 
607
                return _func[0](interface)
 
608
            except IOError, e:
 
609
                if e != errno.EINTR:
 
610
                    raise
647
611
    except (OSError, AttributeError):
648
612
        if "struct" not in sys.modules:
649
613
            import struct
650
614
        if "fcntl" not in sys.modules:
651
615
            import fcntl
652
 
        def if_nametoindex(interface):
 
616
        def the_hard_way(interface):
653
617
            "Get an interface index the hard way, i.e. using fcntl()"
654
618
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
655
619
            s = socket.socket()
658
622
            s.close()
659
623
            interface_index = struct.unpack("I", ifreq[16:20])[0]
660
624
            return interface_index
661
 
    return if_nametoindex(interface)
662
 
 
663
 
 
664
 
def daemon(nochdir = False, noclose = False):
 
625
        _func[0] = the_hard_way
 
626
        return _func[0](interface)
 
627
 
 
628
 
 
629
def daemon(nochdir, noclose):
665
630
    """See daemon(3).  Standard BSD Unix function.
666
631
    This should really exist as os.daemon, but it doesn't (yet)."""
667
632
    if os.fork():
669
634
    os.setsid()
670
635
    if not nochdir:
671
636
        os.chdir("/")
672
 
    if os.fork():
673
 
        sys.exit()
674
637
    if not noclose:
675
638
        # Close all standard open file descriptors
676
639
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
685
648
 
686
649
 
687
650
def main():
688
 
    parser = OptionParser(version = "%%prog %s" % version)
 
651
    global main_loop_started
 
652
    main_loop_started = False
 
653
    
 
654
    parser = OptionParser()
689
655
    parser.add_option("-i", "--interface", type="string",
690
656
                      metavar="IF", help="Bind to interface IF")
691
657
    parser.add_option("-a", "--address", type="string",
694
660
                      help="Port number to receive requests on")
695
661
    parser.add_option("--check", action="store_true", default=False,
696
662
                      help="Run self-test")
697
 
    parser.add_option("--debug", action="store_true",
 
663
    parser.add_option("--debug", action="store_true", default=False,
698
664
                      help="Debug mode; run in foreground and log to"
699
665
                      " terminal")
700
666
    parser.add_option("--priority", type="string", help="GnuTLS"
705
671
                      default="/etc/mandos", metavar="DIR",
706
672
                      help="Directory to search for configuration"
707
673
                      " files")
708
 
    options = parser.parse_args()[0]
 
674
    (options, args) = parser.parse_args()
709
675
    
710
676
    if options.check:
711
677
        import doctest
725
691
    # Parse config file for server-global settings
726
692
    server_config = ConfigParser.SafeConfigParser(server_defaults)
727
693
    del server_defaults
728
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
694
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
695
    server_section = "server"
729
696
    # Convert the SafeConfigParser object to a dict
730
 
    server_settings = server_config.defaults()
 
697
    server_settings = dict(server_config.items(server_section))
731
698
    # Use getboolean on the boolean config option
732
699
    server_settings["debug"] = server_config.getboolean\
733
 
                               ("DEFAULT", "debug")
 
700
                               (server_section, "debug")
734
701
    del server_config
735
702
    
736
703
    # Override the settings from the config file with command line
743
710
    del options
744
711
    # Now we have our good server settings in "server_settings"
745
712
    
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
 
    
758
713
    # Parse config file with clients
759
714
    client_defaults = { "timeout": "1h",
760
715
                        "interval": "5m",
761
 
                        "checker": "fping -q -- %(host)s",
762
 
                        "host": "",
 
716
                        "checker": "fping -q -- %%(fqdn)s",
763
717
                        }
764
718
    client_config = ConfigParser.SafeConfigParser(client_defaults)
765
719
    client_config.read(os.path.join(server_settings["configdir"],
766
720
                                    "clients.conf"))
767
721
    
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
 
    
803
722
    global service
804
723
    service = AvahiService(name = server_settings["servicename"],
805
 
                           servicetype = "_mandos._tcp", )
 
724
                           type = "_mandos._tcp", );
806
725
    if server_settings["interface"]:
807
 
        service.interface = if_nametoindex\
808
 
                            (server_settings["interface"])
 
726
        service.interface = if_nametoindex(server_settings["interface"])
809
727
    
810
728
    global main_loop
811
729
    global bus
814
732
    DBusGMainLoop(set_as_default=True )
815
733
    main_loop = gobject.MainLoop()
816
734
    bus = dbus.SystemBus()
817
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
818
 
                                           avahi.DBUS_PATH_SERVER),
819
 
                            avahi.DBUS_INTERFACE_SERVER)
 
735
    server = dbus.Interface(
 
736
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
737
            avahi.DBUS_INTERFACE_SERVER )
820
738
    # End of Avahi example code
821
739
    
 
740
    debug = server_settings["debug"]
 
741
    
 
742
    if debug:
 
743
        console = logging.StreamHandler()
 
744
        # console.setLevel(logging.DEBUG)
 
745
        console.setFormatter(logging.Formatter\
 
746
                             ('%(levelname)s: %(message)s'))
 
747
        logger.addHandler(console)
 
748
        del console
 
749
    
 
750
    clients = Set()
822
751
    def remove_from_clients(client):
823
752
        clients.remove(client)
824
753
        if not clients:
825
 
            logger.critical(u"No clients left, exiting")
 
754
            logger.debug(u"No clients left, exiting")
826
755
            sys.exit()
827
756
    
828
 
    clients.update(Set(Client(name = section,
 
757
    clients.update(Set(Client(name=section,
829
758
                              stop_hook = remove_from_clients,
830
 
                              config
831
 
                              = dict(client_config.items(section)))
 
759
                              **(dict(client_config\
 
760
                                      .items(section))))
832
761
                       for section in client_config.sections()))
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
 
762
    
 
763
    if not debug:
 
764
        daemon(False, False)
861
765
    
862
766
    def cleanup():
863
767
        "Cleanup function; run on exit"
883
787
    for client in clients:
884
788
        client.start()
885
789
    
886
 
    tcp_server.enable()
887
 
    tcp_server.server_activate()
888
 
    
 
790
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
791
                                 server_settings["port"]),
 
792
                                tcp_handler,
 
793
                                settings=server_settings,
 
794
                                clients=clients)
889
795
    # Find out what port we got
890
796
    service.port = tcp_server.socket.getsockname()[1]
891
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
892
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
797
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
798
                 u" scope_id %d" % tcp_server.socket.getsockname())
893
799
    
894
800
    #service.interface = tcp_server.socket.getsockname()[3]
895
801
    
908
814
                             tcp_server.handle_request\
909
815
                             (*args[2:], **kwargs) or True)
910
816
        
911
 
        logger.debug(u"Starting main loop")
 
817
        logger.debug("Starting main loop")
 
818
        main_loop_started = True
912
819
        main_loop.run()
913
820
    except AvahiError, error:
914
821
        logger.critical(u"AvahiError: %s" + unicode(error))