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  • Committer: Teddy Hogeborn
  • Date: 2008-08-09 15:56:13 UTC
  • mfrom: (24.1.29 mandos)
  • Revision ID: teddy@fukt.bsnet.se-20080809155613-pm1o10yh44nafc0g
Merge.

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Lines of Context:
mandos
11
11
# and some lines in "main".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
15
15
# 
16
16
# This program is free software: you can redistribute it and/or modify
17
17
# it under the terms of the GNU General Public License as published by
24
24
#     GNU General Public License for more details.
25
25
# 
26
26
# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see
28
 
# <http://www.gnu.org/licenses/>.
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
29
28
# 
30
29
# Contact the authors at <mandos@fukt.bsnet.se>.
31
30
# 
34
33
 
35
34
import SocketServer
36
35
import socket
 
36
import select
37
37
from optparse import OptionParser
38
38
import datetime
39
39
import errno
54
54
import stat
55
55
import logging
56
56
import logging.handlers
57
 
import pwd
58
57
 
59
58
import dbus
60
59
import gobject
61
60
import avahi
62
61
from dbus.mainloop.glib import DBusGMainLoop
63
62
import ctypes
64
 
import ctypes.util
65
63
 
66
 
version = "1.0"
67
64
 
68
65
logger = logging.Logger('mandos')
69
66
syslogger = logging.handlers.SysLogHandler\
73
70
                        ('Mandos: %(levelname)s: %(message)s'))
74
71
logger.addHandler(syslogger)
75
72
 
76
 
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
 
                                       ' %(message)s'))
79
 
logger.addHandler(console)
80
73
 
81
74
class AvahiError(Exception):
82
75
    def __init__(self, value):
83
76
        self.value = value
84
 
        super(AvahiError, self).__init__()
85
77
    def __str__(self):
86
78
        return repr(self.value)
87
79
 
109
101
                  a sensible number of times
110
102
    """
111
103
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
112
 
                 servicetype = None, port = None, TXT = None, domain = "",
 
104
                 type = None, port = None, TXT = None, domain = "",
113
105
                 host = "", max_renames = 32768):
114
106
        self.interface = interface
115
107
        self.name = name
116
 
        self.type = servicetype
 
108
        self.type = type
117
109
        self.port = port
118
110
        if TXT is None:
119
111
            self.TXT = []
122
114
        self.domain = domain
123
115
        self.host = host
124
116
        self.rename_count = 0
125
 
        self.max_renames = max_renames
126
117
    def rename(self):
127
118
        """Derived from the Avahi example code"""
128
119
        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)
 
120
            logger.critical(u"No suitable service name found after %i"
 
121
                            u" retries, exiting.", rename_count)
132
122
            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))
 
123
        name = server.GetAlternativeServiceName(name)
 
124
        logger.error(u"Changing name to %r ...", name)
136
125
        syslogger.setFormatter(logging.Formatter\
137
126
                               ('Mandos (%s): %%(levelname)s:'
138
 
                               ' %%(message)s' % self.name))
 
127
                               ' %%(message)s' % name))
139
128
        self.remove()
140
129
        self.add()
141
130
        self.rename_count += 1
153
142
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
143
            group.connect_to_signal('StateChanged',
155
144
                                    entry_group_state_changed)
156
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
145
        logger.debug(u"Adding service '%s' of type '%s' ...",
157
146
                     service.name, service.type)
158
147
        group.AddService(
159
148
                self.interface,         # interface
223
212
    interval = property(lambda self: self._interval,
224
213
                        _set_interval)
225
214
    del _set_interval
226
 
    def __init__(self, name = None, stop_hook=None, config=None):
 
215
    def __init__(self, name = None, stop_hook=None, config={}):
227
216
        """Note: the 'checker' key in 'config' sets the
228
217
        'checker_command' attribute and *not* the 'checker'
229
218
        attribute."""
230
 
        if config is None:
231
 
            config = {}
232
219
        self.name = name
233
220
        logger.debug(u"Creating client %r", self.name)
234
221
        # Uppercase and remove spaces from fingerprint for later
240
227
        if "secret" in config:
241
228
            self.secret = config["secret"].decode(u"base64")
242
229
        elif "secfile" in config:
243
 
            secfile = open(config["secfile"])
244
 
            self.secret = secfile.read()
245
 
            secfile.close()
 
230
            sf = open(config["secfile"])
 
231
            self.secret = sf.read()
 
232
            sf.close()
246
233
        else:
247
234
            raise TypeError(u"No secret or secfile for client %s"
248
235
                            % self.name)
344
331
            try:
345
332
                logger.info(u"Starting checker %r for %s",
346
333
                            command, self.name)
347
 
                # We don't need to redirect stdout and stderr, since
348
 
                # in normal mode, that is already done by daemon(),
349
 
                # and in debug mode we don't want to.  (Stdin is
350
 
                # always replaced by /dev/null.)
351
334
                self.checker = subprocess.Popen(command,
352
335
                                                close_fds=True,
353
336
                                                shell=True, cwd="/")
354
337
                self.checker_callback_tag = gobject.child_watch_add\
355
338
                                            (self.checker.pid,
356
339
                                             self.checker_callback)
357
 
            except OSError, error:
 
340
            except subprocess.OSError, error:
358
341
                logger.error(u"Failed to start subprocess: %s",
359
342
                             error)
360
343
        # Re-run this periodically if run by gobject.timeout_add
417
400
    gnutls.library.functions.gnutls_openpgp_crt_import\
418
401
                    (crt, ctypes.byref(datum),
419
402
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
420
 
    # Verify the self signature in the key
421
 
    crtverify = ctypes.c_uint()
422
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
423
 
        (crt, 0, ctypes.byref(crtverify))
424
 
    if crtverify.value != 0:
425
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
426
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
427
403
    # New buffer for the fingerprint
428
 
    buf = ctypes.create_string_buffer(20)
429
 
    buf_len = ctypes.c_size_t()
 
404
    buffer = ctypes.create_string_buffer(20)
 
405
    buffer_length = ctypes.c_size_t()
430
406
    # Get the fingerprint from the certificate into the buffer
431
407
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
432
 
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
 
408
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
433
409
    # Deinit the certificate
434
410
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
435
411
    # Convert the buffer to a Python bytestring
436
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
412
    fpr = ctypes.string_at(buffer, buffer_length.value)
437
413
    # Convert the bytestring to hexadecimal notation
438
414
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
439
415
    return hex_fpr
440
416
 
441
417
 
442
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
418
class tcp_handler(SocketServer.BaseRequestHandler, object):
443
419
    """A TCP request handler class.
444
420
    Instantiated by IPv6_TCPServer for each request to handle it.
445
421
    Note: This will run in its own forked process."""
472
448
        if self.server.settings["priority"]:
473
449
            priority = self.server.settings["priority"]
474
450
        gnutls.library.functions.gnutls_priority_set_direct\
475
 
            (session._c_object, priority, None)
 
451
            (session._c_object, priority, None);
476
452
        
477
453
        try:
478
454
            session.handshake()
521
497
    Attributes:
522
498
        settings:       Server settings
523
499
        clients:        Set() of Client objects
524
 
        enabled:        Boolean; whether this server is activated yet
525
500
    """
526
501
    address_family = socket.AF_INET6
527
502
    def __init__(self, *args, **kwargs):
531
506
        if "clients" in kwargs:
532
507
            self.clients = kwargs["clients"]
533
508
            del kwargs["clients"]
534
 
        self.enabled = False
535
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
509
        return super(type(self), self).__init__(*args, **kwargs)
536
510
    def server_bind(self):
537
511
        """This overrides the normal server_bind() function
538
512
        to bind to an interface if one was specified, and also NOT to
567
541
#                                            if_nametoindex
568
542
#                                            (self.settings
569
543
#                                             ["interface"]))
570
 
            return super(IPv6_TCPServer, self).server_bind()
571
 
    def server_activate(self):
572
 
        if self.enabled:
573
 
            return super(IPv6_TCPServer, self).server_activate()
574
 
    def enable(self):
575
 
        self.enabled = True
 
544
            return super(type(self), self).server_bind()
576
545
 
577
546
 
578
547
def string_to_delta(interval):
588
557
    datetime.timedelta(1)
589
558
    >>> string_to_delta(u'1w')
590
559
    datetime.timedelta(7)
591
 
    >>> string_to_delta('5m 30s')
592
 
    datetime.timedelta(0, 330)
593
560
    """
594
 
    timevalue = datetime.timedelta(0)
595
 
    for s in interval.split():
596
 
        try:
597
 
            suffix = unicode(s[-1])
598
 
            value = int(s[:-1])
599
 
            if suffix == u"d":
600
 
                delta = datetime.timedelta(value)
601
 
            elif suffix == u"s":
602
 
                delta = datetime.timedelta(0, value)
603
 
            elif suffix == u"m":
604
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
605
 
            elif suffix == u"h":
606
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
607
 
            elif suffix == u"w":
608
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
609
 
            else:
610
 
                raise ValueError
611
 
        except (ValueError, IndexError):
 
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:
612
575
            raise ValueError
613
 
        timevalue += delta
614
 
    return timevalue
 
576
    except (ValueError, IndexError):
 
577
        raise ValueError
 
578
    return delta
615
579
 
616
580
 
617
581
def server_state_changed(state):
618
582
    """Derived from the Avahi example code"""
619
583
    if state == avahi.SERVER_COLLISION:
620
 
        logger.error(u"Zeroconf server name collision")
 
584
        logger.error(u"Server name collision")
621
585
        service.remove()
622
586
    elif state == avahi.SERVER_RUNNING:
623
587
        service.add()
625
589
 
626
590
def entry_group_state_changed(state, error):
627
591
    """Derived from the Avahi example code"""
628
 
    logger.debug(u"Avahi state change: %i", state)
 
592
    logger.debug(u"state change: %i", state)
629
593
    
630
594
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
631
 
        logger.debug(u"Zeroconf service established.")
 
595
        logger.debug(u"Service established.")
632
596
    elif state == avahi.ENTRY_GROUP_COLLISION:
633
 
        logger.warning(u"Zeroconf service name collision.")
 
597
        logger.warning(u"Service name collision.")
634
598
        service.rename()
635
599
    elif state == avahi.ENTRY_GROUP_FAILURE:
636
 
        logger.critical(u"Avahi: Error in group state changed %s",
 
600
        logger.critical(u"Error in group state changed %s",
637
601
                        unicode(error))
638
602
        raise AvahiGroupError("State changed: %s", str(error))
639
603
 
641
605
    """Call the C function if_nametoindex(), or equivalent"""
642
606
    global if_nametoindex
643
607
    try:
 
608
        if "ctypes.util" not in sys.modules:
 
609
            import ctypes.util
644
610
        if_nametoindex = ctypes.cdll.LoadLibrary\
645
611
            (ctypes.util.find_library("c")).if_nametoindex
646
612
    except (OSError, AttributeError):
684
650
 
685
651
 
686
652
def main():
687
 
    parser = OptionParser(version = "%%prog %s" % version)
 
653
    global main_loop_started
 
654
    main_loop_started = False
 
655
    
 
656
    parser = OptionParser()
688
657
    parser.add_option("-i", "--interface", type="string",
689
658
                      metavar="IF", help="Bind to interface IF")
690
659
    parser.add_option("-a", "--address", type="string",
704
673
                      default="/etc/mandos", metavar="DIR",
705
674
                      help="Directory to search for configuration"
706
675
                      " files")
707
 
    options = parser.parse_args()[0]
 
676
    (options, args) = parser.parse_args()
708
677
    
709
678
    if options.check:
710
679
        import doctest
725
694
    server_config = ConfigParser.SafeConfigParser(server_defaults)
726
695
    del server_defaults
727
696
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
697
    server_section = "server"
728
698
    # Convert the SafeConfigParser object to a dict
729
 
    server_settings = server_config.defaults()
 
699
    server_settings = dict(server_config.items(server_section))
730
700
    # Use getboolean on the boolean config option
731
701
    server_settings["debug"] = server_config.getboolean\
732
 
                               ("DEFAULT", "debug")
 
702
                               (server_section, "debug")
733
703
    del server_config
734
704
    
735
705
    # Override the settings from the config file with command line
746
716
    
747
717
    if not debug:
748
718
        syslogger.setLevel(logging.WARNING)
749
 
        console.setLevel(logging.WARNING)
750
719
    
751
720
    if server_settings["servicename"] != "Mandos":
752
721
        syslogger.setFormatter(logging.Formatter\
757
726
    # Parse config file with clients
758
727
    client_defaults = { "timeout": "1h",
759
728
                        "interval": "5m",
760
 
                        "checker": "fping -q -- %(host)s",
761
 
                        "host": "",
 
729
                        "checker": "fping -q -- %%(host)s",
762
730
                        }
763
731
    client_config = ConfigParser.SafeConfigParser(client_defaults)
764
732
    client_config.read(os.path.join(server_settings["configdir"],
765
733
                                    "clients.conf"))
766
734
    
767
 
    clients = Set()
768
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
769
 
                                 server_settings["port"]),
770
 
                                TCP_handler,
771
 
                                settings=server_settings,
772
 
                                clients=clients)
773
 
    pidfilename = "/var/run/mandos.pid"
774
 
    try:
775
 
        pidfile = open(pidfilename, "w")
776
 
    except IOError, error:
777
 
        logger.error("Could not open file %r", pidfilename)
778
 
    
779
 
    uid = 65534
780
 
    gid = 65534
781
 
    try:
782
 
        uid = pwd.getpwnam("mandos").pw_uid
783
 
    except KeyError:
784
 
        try:
785
 
            uid = pwd.getpwnam("nobody").pw_uid
786
 
        except KeyError:
787
 
            pass
788
 
    try:
789
 
        gid = pwd.getpwnam("mandos").pw_gid
790
 
    except KeyError:
791
 
        try:
792
 
            gid = pwd.getpwnam("nogroup").pw_gid
793
 
        except KeyError:
794
 
            pass
795
 
    try:
796
 
        os.setuid(uid)
797
 
        os.setgid(gid)
798
 
    except OSError, error:
799
 
        if error[0] != errno.EPERM:
800
 
            raise error
801
 
    
802
735
    global service
803
736
    service = AvahiService(name = server_settings["servicename"],
804
 
                           servicetype = "_mandos._tcp", )
 
737
                           type = "_mandos._tcp", );
805
738
    if server_settings["interface"]:
806
 
        service.interface = if_nametoindex\
807
 
                            (server_settings["interface"])
 
739
        service.interface = if_nametoindex(server_settings["interface"])
808
740
    
809
741
    global main_loop
810
742
    global bus
813
745
    DBusGMainLoop(set_as_default=True )
814
746
    main_loop = gobject.MainLoop()
815
747
    bus = dbus.SystemBus()
816
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
817
 
                                           avahi.DBUS_PATH_SERVER),
818
 
                            avahi.DBUS_INTERFACE_SERVER)
 
748
    server = dbus.Interface(
 
749
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
750
            avahi.DBUS_INTERFACE_SERVER )
819
751
    # End of Avahi example code
820
752
    
 
753
    if debug:
 
754
        console = logging.StreamHandler()
 
755
        # console.setLevel(logging.DEBUG)
 
756
        console.setFormatter(logging.Formatter\
 
757
                             ('%(levelname)s: %(message)s'))
 
758
        logger.addHandler(console)
 
759
        del console
 
760
    
 
761
    clients = Set()
821
762
    def remove_from_clients(client):
822
763
        clients.remove(client)
823
764
        if not clients:
833
774
        logger.critical(u"No clients defined")
834
775
        sys.exit(1)
835
776
    
836
 
    if debug:
837
 
        # Redirect stdin so all checkers get /dev/null
838
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
839
 
        os.dup2(null, sys.stdin.fileno())
840
 
        if null > 2:
841
 
            os.close(null)
842
 
    else:
843
 
        # No console logging
844
 
        logger.removeHandler(console)
845
 
        # Close all input and output, do double fork, etc.
 
777
    if not debug:
846
778
        daemon()
847
779
    
 
780
    pidfilename = "/var/run/mandos/mandos.pid"
 
781
    pid = os.getpid()
848
782
    try:
849
 
        pid = os.getpid()
 
783
        pidfile = open(pidfilename, "w")
850
784
        pidfile.write(str(pid) + "\n")
851
785
        pidfile.close()
852
786
        del pidfile
853
 
    except IOError:
854
 
        logger.error(u"Could not write to file %r with PID %d",
855
 
                     pidfilename, pid)
856
 
    except NameError:
857
 
        # "pidfile" was never created
858
 
        pass
859
 
    del pidfilename
 
787
    except IOError, err:
 
788
        logger.error(u"Could not write %s file with PID %d",
 
789
                     pidfilename, os.getpid())
860
790
    
861
791
    def cleanup():
862
792
        "Cleanup function; run on exit"
882
812
    for client in clients:
883
813
        client.start()
884
814
    
885
 
    tcp_server.enable()
886
 
    tcp_server.server_activate()
887
 
    
 
815
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
816
                                 server_settings["port"]),
 
817
                                tcp_handler,
 
818
                                settings=server_settings,
 
819
                                clients=clients)
888
820
    # Find out what port we got
889
821
    service.port = tcp_server.socket.getsockname()[1]
890
822
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
908
840
                             (*args[2:], **kwargs) or True)
909
841
        
910
842
        logger.debug(u"Starting main loop")
 
843
        main_loop_started = True
911
844
        main_loop.run()
912
845
    except AvahiError, error:
913
846
        logger.critical(u"AvahiError: %s" + unicode(error))