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  • Committer: Teddy Hogeborn
  • Date: 2008-09-12 19:12:40 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080912191240-edjlcll43eoijkx0
* Makefile (install): Use "install-client-nokey".
  (install-server): Create "/etc/default" and "/usr/sbin", too.
  (install-client): Do not depend on "$(INITRAMFSTOOLS)/hooks/.".
                    Renamed to "install-client-nokey".  Split out
                    post-installation-stuff to new "install-client"
                    target.

* mandos-clients.conf.xml: White space adjustments.
* mandos-keygen.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-runner.xml: - '' -
* plugins.d/mandos-client.xml: - '' -

* overview.xml: Improved grammar.

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Lines of Context:
mandos
11
11
# and some lines in "main".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
# 
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
31
30
# Contact the authors at <mandos@fukt.bsnet.se>.
32
31
# 
33
32
 
34
 
from __future__ import division, with_statement, absolute_import
 
33
from __future__ import division
35
34
 
36
35
import SocketServer
37
36
import socket
38
 
import optparse
 
37
import select
 
38
from optparse import OptionParser
39
39
import datetime
40
40
import errno
41
41
import gnutls.crypto
56
56
import logging
57
57
import logging.handlers
58
58
import pwd
59
 
from contextlib import closing
60
59
 
61
60
import dbus
62
 
import dbus.service
63
61
import gobject
64
62
import avahi
65
63
from dbus.mainloop.glib import DBusGMainLoop
66
64
import ctypes
67
 
import ctypes.util
68
 
 
69
 
try:
70
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
71
 
except AttributeError:
72
 
    try:
73
 
        from IN import SO_BINDTODEVICE
74
 
    except ImportError:
75
 
        # From /usr/include/asm/socket.h
76
 
        SO_BINDTODEVICE = 25
77
 
 
78
 
 
79
 
version = "1.0.8"
 
65
 
 
66
version = "1.0"
80
67
 
81
68
logger = logging.Logger('mandos')
82
 
syslogger = (logging.handlers.SysLogHandler
83
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
84
 
              address = "/dev/log"))
85
 
syslogger.setFormatter(logging.Formatter
86
 
                       ('Mandos [%(process)d]: %(levelname)s:'
87
 
                        ' %(message)s'))
 
69
syslogger = logging.handlers.SysLogHandler\
 
70
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
71
             address = "/dev/log")
 
72
syslogger.setFormatter(logging.Formatter\
 
73
                        ('Mandos: %(levelname)s: %(message)s'))
88
74
logger.addHandler(syslogger)
89
75
 
90
76
console = logging.StreamHandler()
91
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
92
 
                                       ' %(levelname)s: %(message)s'))
 
77
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
 
78
                                       ' %(message)s'))
93
79
logger.addHandler(console)
94
80
 
95
81
class AvahiError(Exception):
96
 
    def __init__(self, value, *args, **kwargs):
 
82
    def __init__(self, value):
97
83
        self.value = value
98
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
99
 
    def __unicode__(self):
100
 
        return unicode(repr(self.value))
 
84
    def __str__(self):
 
85
        return repr(self.value)
101
86
 
102
87
class AvahiServiceError(AvahiError):
103
88
    pass
108
93
 
109
94
class AvahiService(object):
110
95
    """An Avahi (Zeroconf) service.
111
 
    
112
96
    Attributes:
113
97
    interface: integer; avahi.IF_UNSPEC or an interface index.
114
98
               Used to optionally bind to the specified interface.
124
108
                  a sensible number of times
125
109
    """
126
110
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
127
 
                 servicetype = None, port = None, TXT = None,
128
 
                 domain = "", host = "", max_renames = 32768,
129
 
                 protocol = avahi.PROTO_UNSPEC):
 
111
                 type = None, port = None, TXT = None, domain = "",
 
112
                 host = "", max_renames = 32768):
130
113
        self.interface = interface
131
114
        self.name = name
132
 
        self.type = servicetype
 
115
        self.type = type
133
116
        self.port = port
134
 
        self.TXT = TXT if TXT is not None else []
 
117
        if TXT is None:
 
118
            self.TXT = []
 
119
        else:
 
120
            self.TXT = TXT
135
121
        self.domain = domain
136
122
        self.host = host
137
123
        self.rename_count = 0
138
124
        self.max_renames = max_renames
139
 
        self.protocol = protocol
140
125
    def rename(self):
141
126
        """Derived from the Avahi example code"""
142
127
        if self.rename_count >= self.max_renames:
143
128
            logger.critical(u"No suitable Zeroconf service name found"
144
129
                            u" after %i retries, exiting.",
145
 
                            self.rename_count)
146
 
            raise AvahiServiceError(u"Too many renames")
 
130
                            rename_count)
 
131
            raise AvahiServiceError("Too many renames")
147
132
        self.name = server.GetAlternativeServiceName(self.name)
148
133
        logger.info(u"Changing Zeroconf service name to %r ...",
149
134
                    str(self.name))
150
 
        syslogger.setFormatter(logging.Formatter
151
 
                               ('Mandos (%s) [%%(process)d]:'
152
 
                                ' %%(levelname)s: %%(message)s'
153
 
                                % self.name))
 
135
        syslogger.setFormatter(logging.Formatter\
 
136
                               ('Mandos (%s): %%(levelname)s:'
 
137
                               ' %%(message)s' % self.name))
154
138
        self.remove()
155
139
        self.add()
156
140
        self.rename_count += 1
162
146
        """Derived from the Avahi example code"""
163
147
        global group
164
148
        if group is None:
165
 
            group = dbus.Interface(bus.get_object
166
 
                                   (avahi.DBUS_NAME,
 
149
            group = dbus.Interface\
 
150
                    (bus.get_object(avahi.DBUS_NAME,
167
151
                                    server.EntryGroupNew()),
168
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
152
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
169
153
            group.connect_to_signal('StateChanged',
170
154
                                    entry_group_state_changed)
171
155
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
172
156
                     service.name, service.type)
173
157
        group.AddService(
174
158
                self.interface,         # interface
175
 
                self.protocol,          # protocol
 
159
                avahi.PROTO_INET6,      # protocol
176
160
                dbus.UInt32(0),         # flags
177
161
                self.name, self.type,
178
162
                self.domain, self.host,
185
169
# End of Avahi example code
186
170
 
187
171
 
188
 
def _datetime_to_dbus(dt, variant_level=0):
189
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
190
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
191
 
 
192
 
 
193
172
class Client(object):
194
173
    """A representation of a client host served by this server.
195
 
    
196
174
    Attributes:
197
 
    name:       string; from the config file, used in log messages and
198
 
                        D-Bus identifiers
 
175
    name:      string; from the config file, used in log messages
199
176
    fingerprint: string (40 or 32 hexadecimal digits); used to
200
177
                 uniquely identify the client
201
 
    secret:     bytestring; sent verbatim (over TLS) to client
202
 
    host:       string; available for use by the checker command
203
 
    created:    datetime.datetime(); (UTC) object creation
204
 
    last_enabled: datetime.datetime(); (UTC)
205
 
    enabled:    bool()
206
 
    last_checked_ok: datetime.datetime(); (UTC) or None
207
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
208
 
                                      until this client is invalid
209
 
    interval:   datetime.timedelta(); How often to start a new checker
210
 
    disable_hook:  If set, called by disable() as disable_hook(self)
211
 
    checker:    subprocess.Popen(); a running checker process used
212
 
                                    to see if the client lives.
213
 
                                    'None' if no process is running.
 
178
    secret:    bytestring; sent verbatim (over TLS) to client
 
179
    host:      string; available for use by the checker command
 
180
    created:   datetime.datetime(); object creation, not client host
 
181
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
182
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
183
                                     until this client is invalid
 
184
    interval:  datetime.timedelta(); How often to start a new checker
 
185
    stop_hook: If set, called by stop() as stop_hook(self)
 
186
    checker:   subprocess.Popen(); a running checker process used
 
187
                                   to see if the client lives.
 
188
                                   'None' if no process is running.
214
189
    checker_initiator_tag: a gobject event source tag, or None
215
 
    disable_initiator_tag:    - '' -
 
190
    stop_initiator_tag:    - '' -
216
191
    checker_callback_tag:  - '' -
217
192
    checker_command: string; External command which is run to check if
218
193
                     client lives.  %() expansions are done at
219
194
                     runtime with vars(self) as dict, so that for
220
195
                     instance %(name)s can be used in the command.
221
 
    current_checker_command: string; current running checker_command
 
196
    Private attibutes:
 
197
    _timeout: Real variable for 'timeout'
 
198
    _interval: Real variable for 'interval'
 
199
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
200
    _interval_milliseconds: - '' -
222
201
    """
223
 
    def timeout_milliseconds(self):
224
 
        "Return the 'timeout' attribute in milliseconds"
225
 
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
226
 
                + (self.timeout.seconds * 1000)
227
 
                + (self.timeout.microseconds // 1000))
228
 
    
229
 
    def interval_milliseconds(self):
230
 
        "Return the 'interval' attribute in milliseconds"
231
 
        return ((self.interval.days * 24 * 60 * 60 * 1000)
232
 
                + (self.interval.seconds * 1000)
233
 
                + (self.interval.microseconds // 1000))
234
 
    
235
 
    def __init__(self, name = None, disable_hook=None, config=None):
 
202
    def _set_timeout(self, timeout):
 
203
        "Setter function for 'timeout' attribute"
 
204
        self._timeout = timeout
 
205
        self._timeout_milliseconds = ((self.timeout.days
 
206
                                       * 24 * 60 * 60 * 1000)
 
207
                                      + (self.timeout.seconds * 1000)
 
208
                                      + (self.timeout.microseconds
 
209
                                         // 1000))
 
210
    timeout = property(lambda self: self._timeout,
 
211
                       _set_timeout)
 
212
    del _set_timeout
 
213
    def _set_interval(self, interval):
 
214
        "Setter function for 'interval' attribute"
 
215
        self._interval = interval
 
216
        self._interval_milliseconds = ((self.interval.days
 
217
                                        * 24 * 60 * 60 * 1000)
 
218
                                       + (self.interval.seconds
 
219
                                          * 1000)
 
220
                                       + (self.interval.microseconds
 
221
                                          // 1000))
 
222
    interval = property(lambda self: self._interval,
 
223
                        _set_interval)
 
224
    del _set_interval
 
225
    def __init__(self, name = None, stop_hook=None, config={}):
236
226
        """Note: the 'checker' key in 'config' sets the
237
227
        'checker_command' attribute and *not* the 'checker'
238
228
        attribute."""
239
229
        self.name = name
240
 
        if config is None:
241
 
            config = {}
242
230
        logger.debug(u"Creating client %r", self.name)
243
231
        # Uppercase and remove spaces from fingerprint for later
244
232
        # comparison purposes with return value from the fingerprint()
245
233
        # function
246
 
        self.fingerprint = (config["fingerprint"].upper()
247
 
                            .replace(u" ", u""))
 
234
        self.fingerprint = config["fingerprint"].upper()\
 
235
                           .replace(u" ", u"")
248
236
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
249
237
        if "secret" in config:
250
238
            self.secret = config["secret"].decode(u"base64")
251
239
        elif "secfile" in config:
252
 
            with closing(open(os.path.expanduser
253
 
                              (os.path.expandvars
254
 
                               (config["secfile"])))) as secfile:
255
 
                self.secret = secfile.read()
 
240
            sf = open(config["secfile"])
 
241
            self.secret = sf.read()
 
242
            sf.close()
256
243
        else:
257
244
            raise TypeError(u"No secret or secfile for client %s"
258
245
                            % self.name)
259
246
        self.host = config.get("host", "")
260
 
        self.created = datetime.datetime.utcnow()
261
 
        self.enabled = False
262
 
        self.last_enabled = None
 
247
        self.created = datetime.datetime.now()
263
248
        self.last_checked_ok = None
264
249
        self.timeout = string_to_delta(config["timeout"])
265
250
        self.interval = string_to_delta(config["interval"])
266
 
        self.disable_hook = disable_hook
 
251
        self.stop_hook = stop_hook
267
252
        self.checker = None
268
253
        self.checker_initiator_tag = None
269
 
        self.disable_initiator_tag = None
 
254
        self.stop_initiator_tag = None
270
255
        self.checker_callback_tag = None
271
 
        self.checker_command = config["checker"]
272
 
        self.current_checker_command = None
273
 
        self.last_connect = None
274
 
    
275
 
    def enable(self):
 
256
        self.check_command = config["checker"]
 
257
    def start(self):
276
258
        """Start this client's checker and timeout hooks"""
277
 
        self.last_enabled = datetime.datetime.utcnow()
278
259
        # Schedule a new checker to be started an 'interval' from now,
279
260
        # and every interval from then on.
280
 
        self.checker_initiator_tag = (gobject.timeout_add
281
 
                                      (self.interval_milliseconds(),
282
 
                                       self.start_checker))
 
261
        self.checker_initiator_tag = gobject.timeout_add\
 
262
                                     (self._interval_milliseconds,
 
263
                                      self.start_checker)
283
264
        # Also start a new checker *right now*.
284
265
        self.start_checker()
285
 
        # Schedule a disable() when 'timeout' has passed
286
 
        self.disable_initiator_tag = (gobject.timeout_add
287
 
                                   (self.timeout_milliseconds(),
288
 
                                    self.disable))
289
 
        self.enabled = True
290
 
    
291
 
    def disable(self):
292
 
        """Disable this client."""
293
 
        if not getattr(self, "enabled", False):
 
266
        # Schedule a stop() when 'timeout' has passed
 
267
        self.stop_initiator_tag = gobject.timeout_add\
 
268
                                  (self._timeout_milliseconds,
 
269
                                   self.stop)
 
270
    def stop(self):
 
271
        """Stop this client.
 
272
        The possibility that a client might be restarted is left open,
 
273
        but not currently used."""
 
274
        # If this client doesn't have a secret, it is already stopped.
 
275
        if hasattr(self, "secret") and self.secret:
 
276
            logger.info(u"Stopping client %s", self.name)
 
277
            self.secret = None
 
278
        else:
294
279
            return False
295
 
        logger.info(u"Disabling client %s", self.name)
296
 
        if getattr(self, "disable_initiator_tag", False):
297
 
            gobject.source_remove(self.disable_initiator_tag)
298
 
            self.disable_initiator_tag = None
 
280
        if getattr(self, "stop_initiator_tag", False):
 
281
            gobject.source_remove(self.stop_initiator_tag)
 
282
            self.stop_initiator_tag = None
299
283
        if getattr(self, "checker_initiator_tag", False):
300
284
            gobject.source_remove(self.checker_initiator_tag)
301
285
            self.checker_initiator_tag = None
302
286
        self.stop_checker()
303
 
        if self.disable_hook:
304
 
            self.disable_hook(self)
305
 
        self.enabled = False
 
287
        if self.stop_hook:
 
288
            self.stop_hook(self)
306
289
        # Do not run this again if called by a gobject.timeout_add
307
290
        return False
308
 
    
309
291
    def __del__(self):
310
 
        self.disable_hook = None
311
 
        self.disable()
312
 
    
313
 
    def checker_callback(self, pid, condition, command):
 
292
        self.stop_hook = None
 
293
        self.stop()
 
294
    def checker_callback(self, pid, condition):
314
295
        """The checker has completed, so take appropriate actions."""
 
296
        now = datetime.datetime.now()
315
297
        self.checker_callback_tag = None
316
298
        self.checker = None
317
 
        if os.WIFEXITED(condition):
318
 
            exitstatus = os.WEXITSTATUS(condition)
319
 
            if exitstatus == 0:
320
 
                logger.info(u"Checker for %(name)s succeeded",
321
 
                            vars(self))
322
 
                self.checked_ok()
323
 
            else:
324
 
                logger.info(u"Checker for %(name)s failed",
325
 
                            vars(self))
326
 
        else:
 
299
        if os.WIFEXITED(condition) \
 
300
               and (os.WEXITSTATUS(condition) == 0):
 
301
            logger.info(u"Checker for %(name)s succeeded",
 
302
                        vars(self))
 
303
            self.last_checked_ok = now
 
304
            gobject.source_remove(self.stop_initiator_tag)
 
305
            self.stop_initiator_tag = gobject.timeout_add\
 
306
                                      (self._timeout_milliseconds,
 
307
                                       self.stop)
 
308
        elif not os.WIFEXITED(condition):
327
309
            logger.warning(u"Checker for %(name)s crashed?",
328
310
                           vars(self))
329
 
    
330
 
    def checked_ok(self):
331
 
        """Bump up the timeout for this client.
332
 
        
333
 
        This should only be called when the client has been seen,
334
 
        alive and well.
335
 
        """
336
 
        self.last_checked_ok = datetime.datetime.utcnow()
337
 
        gobject.source_remove(self.disable_initiator_tag)
338
 
        self.disable_initiator_tag = (gobject.timeout_add
339
 
                                      (self.timeout_milliseconds(),
340
 
                                       self.disable))
341
 
    
 
311
        else:
 
312
            logger.info(u"Checker for %(name)s failed",
 
313
                        vars(self))
342
314
    def start_checker(self):
343
315
        """Start a new checker subprocess if one is not running.
344
 
        
345
316
        If a checker already exists, leave it running and do
346
317
        nothing."""
347
318
        # The reason for not killing a running checker is that if we
352
323
        # checkers alone, the checker would have to take more time
353
324
        # than 'timeout' for the client to be declared invalid, which
354
325
        # is as it should be.
355
 
        
356
 
        # If a checker exists, make sure it is not a zombie
357
 
        if self.checker is not None:
358
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
359
 
            if pid:
360
 
                logger.warning("Checker was a zombie")
361
 
                gobject.source_remove(self.checker_callback_tag)
362
 
                self.checker_callback(pid, status,
363
 
                                      self.current_checker_command)
364
 
        # Start a new checker if needed
365
326
        if self.checker is None:
366
327
            try:
367
 
                # In case checker_command has exactly one % operator
368
 
                command = self.checker_command % self.host
 
328
                # In case check_command has exactly one % operator
 
329
                command = self.check_command % self.host
369
330
            except TypeError:
370
331
                # Escape attributes for the shell
371
332
                escaped_attrs = dict((key, re.escape(str(val)))
372
333
                                     for key, val in
373
334
                                     vars(self).iteritems())
374
335
                try:
375
 
                    command = self.checker_command % escaped_attrs
 
336
                    command = self.check_command % escaped_attrs
376
337
                except TypeError, error:
377
338
                    logger.error(u'Could not format string "%s":'
378
 
                                 u' %s', self.checker_command, error)
 
339
                                 u' %s', self.check_command, error)
379
340
                    return True # Try again later
380
 
            self.current_checker_command = command
381
341
            try:
382
342
                logger.info(u"Starting checker %r for %s",
383
343
                            command, self.name)
388
348
                self.checker = subprocess.Popen(command,
389
349
                                                close_fds=True,
390
350
                                                shell=True, cwd="/")
391
 
                self.checker_callback_tag = (gobject.child_watch_add
392
 
                                             (self.checker.pid,
393
 
                                              self.checker_callback,
394
 
                                              data=command))
395
 
                # The checker may have completed before the gobject
396
 
                # watch was added.  Check for this.
397
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
398
 
                if pid:
399
 
                    gobject.source_remove(self.checker_callback_tag)
400
 
                    self.checker_callback(pid, status, command)
 
351
                self.checker_callback_tag = gobject.child_watch_add\
 
352
                                            (self.checker.pid,
 
353
                                             self.checker_callback)
401
354
            except OSError, error:
402
355
                logger.error(u"Failed to start subprocess: %s",
403
356
                             error)
404
357
        # Re-run this periodically if run by gobject.timeout_add
405
358
        return True
406
 
    
407
359
    def stop_checker(self):
408
360
        """Force the checker process, if any, to stop."""
409
361
        if self.checker_callback_tag:
421
373
            if error.errno != errno.ESRCH: # No such process
422
374
                raise
423
375
        self.checker = None
424
 
    
425
376
    def still_valid(self):
426
377
        """Has the timeout not yet passed for this client?"""
427
 
        if not getattr(self, "enabled", False):
428
 
            return False
429
 
        now = datetime.datetime.utcnow()
 
378
        now = datetime.datetime.now()
430
379
        if self.last_checked_ok is None:
431
380
            return now < (self.created + self.timeout)
432
381
        else:
433
382
            return now < (self.last_checked_ok + self.timeout)
434
383
 
435
384
 
436
 
class ClientDBus(Client, dbus.service.Object):
437
 
    """A Client class using D-Bus
438
 
    
439
 
    Attributes:
440
 
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
441
 
    """
442
 
    # dbus.service.Object doesn't use super(), so we can't either.
443
 
    
444
 
    def __init__(self, *args, **kwargs):
445
 
        Client.__init__(self, *args, **kwargs)
446
 
        # Only now, when this client is initialized, can it show up on
447
 
        # the D-Bus
448
 
        self.dbus_object_path = (dbus.ObjectPath
449
 
                                 ("/clients/"
450
 
                                  + self.name.replace(".", "_")))
451
 
        dbus.service.Object.__init__(self, bus,
452
 
                                     self.dbus_object_path)
453
 
    def enable(self):
454
 
        oldstate = getattr(self, "enabled", False)
455
 
        r = Client.enable(self)
456
 
        if oldstate != self.enabled:
457
 
            # Emit D-Bus signals
458
 
            self.PropertyChanged(dbus.String(u"enabled"),
459
 
                                 dbus.Boolean(True, variant_level=1))
460
 
            self.PropertyChanged(dbus.String(u"last_enabled"),
461
 
                                 (_datetime_to_dbus(self.last_enabled,
462
 
                                                    variant_level=1)))
463
 
        return r
464
 
    
465
 
    def disable(self, signal = True):
466
 
        oldstate = getattr(self, "enabled", False)
467
 
        r = Client.disable(self)
468
 
        if signal and oldstate != self.enabled:
469
 
            # Emit D-Bus signal
470
 
            self.PropertyChanged(dbus.String(u"enabled"),
471
 
                                 dbus.Boolean(False, variant_level=1))
472
 
        return r
473
 
    
474
 
    def __del__(self, *args, **kwargs):
475
 
        try:
476
 
            self.remove_from_connection()
477
 
        except LookupError:
478
 
            pass
479
 
        if hasattr(dbus.service.Object, "__del__"):
480
 
            dbus.service.Object.__del__(self, *args, **kwargs)
481
 
        Client.__del__(self, *args, **kwargs)
482
 
    
483
 
    def checker_callback(self, pid, condition, command,
484
 
                         *args, **kwargs):
485
 
        self.checker_callback_tag = None
486
 
        self.checker = None
487
 
        # Emit D-Bus signal
488
 
        self.PropertyChanged(dbus.String(u"checker_running"),
489
 
                             dbus.Boolean(False, variant_level=1))
490
 
        if os.WIFEXITED(condition):
491
 
            exitstatus = os.WEXITSTATUS(condition)
492
 
            # Emit D-Bus signal
493
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
494
 
                                  dbus.Int64(condition),
495
 
                                  dbus.String(command))
496
 
        else:
497
 
            # Emit D-Bus signal
498
 
            self.CheckerCompleted(dbus.Int16(-1),
499
 
                                  dbus.Int64(condition),
500
 
                                  dbus.String(command))
501
 
        
502
 
        return Client.checker_callback(self, pid, condition, command,
503
 
                                       *args, **kwargs)
504
 
    
505
 
    def checked_ok(self, *args, **kwargs):
506
 
        r = Client.checked_ok(self, *args, **kwargs)
507
 
        # Emit D-Bus signal
508
 
        self.PropertyChanged(
509
 
            dbus.String(u"last_checked_ok"),
510
 
            (_datetime_to_dbus(self.last_checked_ok,
511
 
                               variant_level=1)))
512
 
        return r
513
 
    
514
 
    def start_checker(self, *args, **kwargs):
515
 
        old_checker = self.checker
516
 
        if self.checker is not None:
517
 
            old_checker_pid = self.checker.pid
518
 
        else:
519
 
            old_checker_pid = None
520
 
        r = Client.start_checker(self, *args, **kwargs)
521
 
        # Only if new checker process was started
522
 
        if (self.checker is not None
523
 
            and old_checker_pid != self.checker.pid):
524
 
            # Emit D-Bus signal
525
 
            self.CheckerStarted(self.current_checker_command)
526
 
            self.PropertyChanged(
527
 
                dbus.String("checker_running"),
528
 
                dbus.Boolean(True, variant_level=1))
529
 
        return r
530
 
    
531
 
    def stop_checker(self, *args, **kwargs):
532
 
        old_checker = getattr(self, "checker", None)
533
 
        r = Client.stop_checker(self, *args, **kwargs)
534
 
        if (old_checker is not None
535
 
            and getattr(self, "checker", None) is None):
536
 
            self.PropertyChanged(dbus.String(u"checker_running"),
537
 
                                 dbus.Boolean(False, variant_level=1))
538
 
        return r
539
 
    
540
 
    ## D-Bus methods & signals
541
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
542
 
    
543
 
    # CheckedOK - method
544
 
    CheckedOK = dbus.service.method(_interface)(checked_ok)
545
 
    CheckedOK.__name__ = "CheckedOK"
546
 
    
547
 
    # CheckerCompleted - signal
548
 
    @dbus.service.signal(_interface, signature="nxs")
549
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
550
 
        "D-Bus signal"
551
 
        pass
552
 
    
553
 
    # CheckerStarted - signal
554
 
    @dbus.service.signal(_interface, signature="s")
555
 
    def CheckerStarted(self, command):
556
 
        "D-Bus signal"
557
 
        pass
558
 
    
559
 
    # GetAllProperties - method
560
 
    @dbus.service.method(_interface, out_signature="a{sv}")
561
 
    def GetAllProperties(self):
562
 
        "D-Bus method"
563
 
        return dbus.Dictionary({
564
 
                dbus.String("name"):
565
 
                    dbus.String(self.name, variant_level=1),
566
 
                dbus.String("fingerprint"):
567
 
                    dbus.String(self.fingerprint, variant_level=1),
568
 
                dbus.String("host"):
569
 
                    dbus.String(self.host, variant_level=1),
570
 
                dbus.String("created"):
571
 
                    _datetime_to_dbus(self.created, variant_level=1),
572
 
                dbus.String("last_enabled"):
573
 
                    (_datetime_to_dbus(self.last_enabled,
574
 
                                       variant_level=1)
575
 
                     if self.last_enabled is not None
576
 
                     else dbus.Boolean(False, variant_level=1)),
577
 
                dbus.String("enabled"):
578
 
                    dbus.Boolean(self.enabled, variant_level=1),
579
 
                dbus.String("last_checked_ok"):
580
 
                    (_datetime_to_dbus(self.last_checked_ok,
581
 
                                       variant_level=1)
582
 
                     if self.last_checked_ok is not None
583
 
                     else dbus.Boolean (False, variant_level=1)),
584
 
                dbus.String("timeout"):
585
 
                    dbus.UInt64(self.timeout_milliseconds(),
586
 
                                variant_level=1),
587
 
                dbus.String("interval"):
588
 
                    dbus.UInt64(self.interval_milliseconds(),
589
 
                                variant_level=1),
590
 
                dbus.String("checker"):
591
 
                    dbus.String(self.checker_command,
592
 
                                variant_level=1),
593
 
                dbus.String("checker_running"):
594
 
                    dbus.Boolean(self.checker is not None,
595
 
                                 variant_level=1),
596
 
                dbus.String("object_path"):
597
 
                    dbus.ObjectPath(self.dbus_object_path,
598
 
                                    variant_level=1)
599
 
                }, signature="sv")
600
 
    
601
 
    # IsStillValid - method
602
 
    @dbus.service.method(_interface, out_signature="b")
603
 
    def IsStillValid(self):
604
 
        return self.still_valid()
605
 
    
606
 
    # PropertyChanged - signal
607
 
    @dbus.service.signal(_interface, signature="sv")
608
 
    def PropertyChanged(self, property, value):
609
 
        "D-Bus signal"
610
 
        pass
611
 
    
612
 
    # ReceivedSecret - signal
613
 
    @dbus.service.signal(_interface)
614
 
    def ReceivedSecret(self):
615
 
        "D-Bus signal"
616
 
        pass
617
 
    
618
 
    # Rejected - signal
619
 
    @dbus.service.signal(_interface)
620
 
    def Rejected(self):
621
 
        "D-Bus signal"
622
 
        pass
623
 
    
624
 
    # SetChecker - method
625
 
    @dbus.service.method(_interface, in_signature="s")
626
 
    def SetChecker(self, checker):
627
 
        "D-Bus setter method"
628
 
        self.checker_command = checker
629
 
        # Emit D-Bus signal
630
 
        self.PropertyChanged(dbus.String(u"checker"),
631
 
                             dbus.String(self.checker_command,
632
 
                                         variant_level=1))
633
 
    
634
 
    # SetHost - method
635
 
    @dbus.service.method(_interface, in_signature="s")
636
 
    def SetHost(self, host):
637
 
        "D-Bus setter method"
638
 
        self.host = host
639
 
        # Emit D-Bus signal
640
 
        self.PropertyChanged(dbus.String(u"host"),
641
 
                             dbus.String(self.host, variant_level=1))
642
 
    
643
 
    # SetInterval - method
644
 
    @dbus.service.method(_interface, in_signature="t")
645
 
    def SetInterval(self, milliseconds):
646
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
647
 
        # Emit D-Bus signal
648
 
        self.PropertyChanged(dbus.String(u"interval"),
649
 
                             (dbus.UInt64(self.interval_milliseconds(),
650
 
                                          variant_level=1)))
651
 
    
652
 
    # SetSecret - method
653
 
    @dbus.service.method(_interface, in_signature="ay",
654
 
                         byte_arrays=True)
655
 
    def SetSecret(self, secret):
656
 
        "D-Bus setter method"
657
 
        self.secret = str(secret)
658
 
    
659
 
    # SetTimeout - method
660
 
    @dbus.service.method(_interface, in_signature="t")
661
 
    def SetTimeout(self, milliseconds):
662
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
663
 
        # Emit D-Bus signal
664
 
        self.PropertyChanged(dbus.String(u"timeout"),
665
 
                             (dbus.UInt64(self.timeout_milliseconds(),
666
 
                                          variant_level=1)))
667
 
    
668
 
    # Enable - method
669
 
    Enable = dbus.service.method(_interface)(enable)
670
 
    Enable.__name__ = "Enable"
671
 
    
672
 
    # StartChecker - method
673
 
    @dbus.service.method(_interface)
674
 
    def StartChecker(self):
675
 
        "D-Bus method"
676
 
        self.start_checker()
677
 
    
678
 
    # Disable - method
679
 
    @dbus.service.method(_interface)
680
 
    def Disable(self):
681
 
        "D-Bus method"
682
 
        self.disable()
683
 
    
684
 
    # StopChecker - method
685
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
686
 
    StopChecker.__name__ = "StopChecker"
687
 
    
688
 
    del _interface
689
 
 
690
 
 
691
 
class ClientHandler(SocketServer.BaseRequestHandler, object):
692
 
    """A class to handle client connections.
693
 
    
694
 
    Instantiated once for each connection to handle it.
 
385
def peer_certificate(session):
 
386
    "Return the peer's OpenPGP certificate as a bytestring"
 
387
    # If not an OpenPGP certificate...
 
388
    if gnutls.library.functions.gnutls_certificate_type_get\
 
389
            (session._c_object) \
 
390
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
391
        # ...do the normal thing
 
392
        return session.peer_certificate
 
393
    list_size = ctypes.c_uint()
 
394
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
395
        (session._c_object, ctypes.byref(list_size))
 
396
    if list_size.value == 0:
 
397
        return None
 
398
    cert = cert_list[0]
 
399
    return ctypes.string_at(cert.data, cert.size)
 
400
 
 
401
 
 
402
def fingerprint(openpgp):
 
403
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
404
    # New GnuTLS "datum" with the OpenPGP public key
 
405
    datum = gnutls.library.types.gnutls_datum_t\
 
406
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
407
                     ctypes.POINTER(ctypes.c_ubyte)),
 
408
         ctypes.c_uint(len(openpgp)))
 
409
    # New empty GnuTLS certificate
 
410
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
411
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
412
        (ctypes.byref(crt))
 
413
    # Import the OpenPGP public key into the certificate
 
414
    gnutls.library.functions.gnutls_openpgp_crt_import\
 
415
                    (crt, ctypes.byref(datum),
 
416
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
417
    # Verify the self signature in the key
 
418
    crtverify = ctypes.c_uint();
 
419
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
 
420
        (crt, 0, ctypes.byref(crtverify))
 
421
    if crtverify.value != 0:
 
422
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
423
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
424
    # New buffer for the fingerprint
 
425
    buffer = ctypes.create_string_buffer(20)
 
426
    buffer_length = ctypes.c_size_t()
 
427
    # Get the fingerprint from the certificate into the buffer
 
428
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
429
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
430
    # Deinit the certificate
 
431
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
432
    # Convert the buffer to a Python bytestring
 
433
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
434
    # Convert the bytestring to hexadecimal notation
 
435
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
436
    return hex_fpr
 
437
 
 
438
 
 
439
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
440
    """A TCP request handler class.
 
441
    Instantiated by IPv6_TCPServer for each request to handle it.
695
442
    Note: This will run in its own forked process."""
696
443
    
697
444
    def handle(self):
698
445
        logger.info(u"TCP connection from: %s",
699
 
                    unicode(self.client_address))
700
 
        logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
701
 
        # Open IPC pipe to parent process
702
 
        with closing(os.fdopen(self.server.pipe[1], "w", 1)) as ipc:
703
 
            session = (gnutls.connection
704
 
                       .ClientSession(self.request,
705
 
                                      gnutls.connection
706
 
                                      .X509Credentials()))
707
 
            
708
 
            line = self.request.makefile().readline()
709
 
            logger.debug(u"Protocol version: %r", line)
710
 
            try:
711
 
                if int(line.strip().split()[0]) > 1:
712
 
                    raise RuntimeError
713
 
            except (ValueError, IndexError, RuntimeError), error:
714
 
                logger.error(u"Unknown protocol version: %s", error)
715
 
                return
716
 
            
717
 
            # Note: gnutls.connection.X509Credentials is really a
718
 
            # generic GnuTLS certificate credentials object so long as
719
 
            # no X.509 keys are added to it.  Therefore, we can use it
720
 
            # here despite using OpenPGP certificates.
721
 
            
722
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
723
 
            #                     "+AES-256-CBC", "+SHA1",
724
 
            #                     "+COMP-NULL", "+CTYPE-OPENPGP",
725
 
            #                     "+DHE-DSS"))
726
 
            # Use a fallback default, since this MUST be set.
727
 
            priority = self.server.gnutls_priority
728
 
            if priority is None:
729
 
                priority = "NORMAL"
730
 
            (gnutls.library.functions
731
 
             .gnutls_priority_set_direct(session._c_object,
732
 
                                         priority, None))
733
 
            
734
 
            try:
735
 
                session.handshake()
736
 
            except gnutls.errors.GNUTLSError, error:
737
 
                logger.warning(u"Handshake failed: %s", error)
738
 
                # Do not run session.bye() here: the session is not
739
 
                # established.  Just abandon the request.
740
 
                return
741
 
            logger.debug(u"Handshake succeeded")
742
 
            try:
743
 
                fpr = self.fingerprint(self.peer_certificate(session))
744
 
            except (TypeError, gnutls.errors.GNUTLSError), error:
745
 
                logger.warning(u"Bad certificate: %s", error)
746
 
                session.bye()
747
 
                return
748
 
            logger.debug(u"Fingerprint: %s", fpr)
749
 
            
750
 
            for c in self.server.clients:
751
 
                if c.fingerprint == fpr:
752
 
                    client = c
753
 
                    break
754
 
            else:
755
 
                ipc.write("NOTFOUND %s\n" % fpr)
756
 
                session.bye()
757
 
                return
758
 
            # Have to check if client.still_valid(), since it is
759
 
            # possible that the client timed out while establishing
760
 
            # the GnuTLS session.
761
 
            if not client.still_valid():
762
 
                ipc.write("INVALID %s\n" % client.name)
763
 
                session.bye()
764
 
                return
765
 
            ipc.write("SENDING %s\n" % client.name)
766
 
            sent_size = 0
767
 
            while sent_size < len(client.secret):
768
 
                sent = session.send(client.secret[sent_size:])
769
 
                logger.debug(u"Sent: %d, remaining: %d",
770
 
                             sent, len(client.secret)
771
 
                             - (sent_size + sent))
772
 
                sent_size += sent
773
 
            session.bye()
774
 
    
775
 
    @staticmethod
776
 
    def peer_certificate(session):
777
 
        "Return the peer's OpenPGP certificate as a bytestring"
778
 
        # If not an OpenPGP certificate...
779
 
        if (gnutls.library.functions
780
 
            .gnutls_certificate_type_get(session._c_object)
781
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
782
 
            # ...do the normal thing
783
 
            return session.peer_certificate
784
 
        list_size = ctypes.c_uint(1)
785
 
        cert_list = (gnutls.library.functions
786
 
                     .gnutls_certificate_get_peers
787
 
                     (session._c_object, ctypes.byref(list_size)))
788
 
        if not bool(cert_list) and list_size.value != 0:
789
 
            raise gnutls.errors.GNUTLSError("error getting peer"
790
 
                                            " certificate")
791
 
        if list_size.value == 0:
792
 
            return None
793
 
        cert = cert_list[0]
794
 
        return ctypes.string_at(cert.data, cert.size)
795
 
    
796
 
    @staticmethod
797
 
    def fingerprint(openpgp):
798
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
799
 
        # New GnuTLS "datum" with the OpenPGP public key
800
 
        datum = (gnutls.library.types
801
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
802
 
                                             ctypes.POINTER
803
 
                                             (ctypes.c_ubyte)),
804
 
                                 ctypes.c_uint(len(openpgp))))
805
 
        # New empty GnuTLS certificate
806
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
807
 
        (gnutls.library.functions
808
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
809
 
        # Import the OpenPGP public key into the certificate
810
 
        (gnutls.library.functions
811
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
812
 
                                    gnutls.library.constants
813
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
814
 
        # Verify the self signature in the key
815
 
        crtverify = ctypes.c_uint()
816
 
        (gnutls.library.functions
817
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
818
 
                                         ctypes.byref(crtverify)))
819
 
        if crtverify.value != 0:
820
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
821
 
            raise (gnutls.errors.CertificateSecurityError
822
 
                   ("Verify failed"))
823
 
        # New buffer for the fingerprint
824
 
        buf = ctypes.create_string_buffer(20)
825
 
        buf_len = ctypes.c_size_t()
826
 
        # Get the fingerprint from the certificate into the buffer
827
 
        (gnutls.library.functions
828
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
829
 
                                             ctypes.byref(buf_len)))
830
 
        # Deinit the certificate
831
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
832
 
        # Convert the buffer to a Python bytestring
833
 
        fpr = ctypes.string_at(buf, buf_len.value)
834
 
        # Convert the bytestring to hexadecimal notation
835
 
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
836
 
        return hex_fpr
837
 
 
838
 
 
839
 
class ForkingMixInWithPipe(SocketServer.ForkingMixIn, object):
840
 
    """Like SocketServer.ForkingMixIn, but also pass a pipe.
841
 
    
842
 
    Assumes a gobject.MainLoop event loop.
843
 
    """
844
 
    def process_request(self, request, client_address):
845
 
        """Overrides and wraps the original process_request().
846
 
        
847
 
        This function creates a new pipe in self.pipe 
848
 
        """
849
 
        self.pipe = os.pipe()
850
 
        super(ForkingMixInWithPipe,
851
 
              self).process_request(request, client_address)
852
 
        os.close(self.pipe[1])  # close write end
853
 
        # Call "handle_ipc" for both data and EOF events
854
 
        gobject.io_add_watch(self.pipe[0],
855
 
                             gobject.IO_IN | gobject.IO_HUP,
856
 
                             self.handle_ipc)
857
 
    def handle_ipc(source, condition):
858
 
        """Dummy function; override as necessary"""
859
 
        os.close(source)
860
 
        return False
861
 
 
862
 
 
863
 
class IPv6_TCPServer(ForkingMixInWithPipe,
864
 
                     SocketServer.TCPServer, object):
865
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
866
 
    
 
446
                     unicode(self.client_address))
 
447
        session = gnutls.connection.ClientSession\
 
448
                  (self.request, gnutls.connection.X509Credentials())
 
449
        
 
450
        line = self.request.makefile().readline()
 
451
        logger.debug(u"Protocol version: %r", line)
 
452
        try:
 
453
            if int(line.strip().split()[0]) > 1:
 
454
                raise RuntimeError
 
455
        except (ValueError, IndexError, RuntimeError), error:
 
456
            logger.error(u"Unknown protocol version: %s", error)
 
457
            return
 
458
        
 
459
        # Note: gnutls.connection.X509Credentials is really a generic
 
460
        # GnuTLS certificate credentials object so long as no X.509
 
461
        # keys are added to it.  Therefore, we can use it here despite
 
462
        # using OpenPGP certificates.
 
463
        
 
464
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
465
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
466
        #                "+DHE-DSS"))
 
467
        priority = "NORMAL"             # Fallback default, since this
 
468
                                        # MUST be set.
 
469
        if self.server.settings["priority"]:
 
470
            priority = self.server.settings["priority"]
 
471
        gnutls.library.functions.gnutls_priority_set_direct\
 
472
            (session._c_object, priority, None);
 
473
        
 
474
        try:
 
475
            session.handshake()
 
476
        except gnutls.errors.GNUTLSError, error:
 
477
            logger.warning(u"Handshake failed: %s", error)
 
478
            # Do not run session.bye() here: the session is not
 
479
            # established.  Just abandon the request.
 
480
            return
 
481
        try:
 
482
            fpr = fingerprint(peer_certificate(session))
 
483
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
484
            logger.warning(u"Bad certificate: %s", error)
 
485
            session.bye()
 
486
            return
 
487
        logger.debug(u"Fingerprint: %s", fpr)
 
488
        client = None
 
489
        for c in self.server.clients:
 
490
            if c.fingerprint == fpr:
 
491
                client = c
 
492
                break
 
493
        if not client:
 
494
            logger.warning(u"Client not found for fingerprint: %s",
 
495
                           fpr)
 
496
            session.bye()
 
497
            return
 
498
        # Have to check if client.still_valid(), since it is possible
 
499
        # that the client timed out while establishing the GnuTLS
 
500
        # session.
 
501
        if not client.still_valid():
 
502
            logger.warning(u"Client %(name)s is invalid",
 
503
                           vars(client))
 
504
            session.bye()
 
505
            return
 
506
        sent_size = 0
 
507
        while sent_size < len(client.secret):
 
508
            sent = session.send(client.secret[sent_size:])
 
509
            logger.debug(u"Sent: %d, remaining: %d",
 
510
                         sent, len(client.secret)
 
511
                         - (sent_size + sent))
 
512
            sent_size += sent
 
513
        session.bye()
 
514
 
 
515
 
 
516
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
517
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
867
518
    Attributes:
 
519
        settings:       Server settings
 
520
        clients:        Set() of Client objects
868
521
        enabled:        Boolean; whether this server is activated yet
869
 
        interface:      None or a network interface name (string)
870
 
        use_ipv6:       Boolean; to use IPv6 or not
871
 
        ----
872
 
        clients:        Set() of Client objects
873
 
        gnutls_priority GnuTLS priority string
874
 
        use_dbus:       Boolean; to emit D-Bus signals or not
875
522
    """
876
 
    def __init__(self, server_address, RequestHandlerClass,
877
 
                 interface=None, use_ipv6=True, clients=None,
878
 
                 gnutls_priority=None, use_dbus=True):
 
523
    address_family = socket.AF_INET6
 
524
    def __init__(self, *args, **kwargs):
 
525
        if "settings" in kwargs:
 
526
            self.settings = kwargs["settings"]
 
527
            del kwargs["settings"]
 
528
        if "clients" in kwargs:
 
529
            self.clients = kwargs["clients"]
 
530
            del kwargs["clients"]
879
531
        self.enabled = False
880
 
        self.interface = interface
881
 
        if use_ipv6:
882
 
            self.address_family = socket.AF_INET6
883
 
        self.clients = clients
884
 
        self.use_dbus = use_dbus
885
 
        self.gnutls_priority = gnutls_priority
886
 
        SocketServer.TCPServer.__init__(self, server_address,
887
 
                                        RequestHandlerClass)
 
532
        return super(type(self), self).__init__(*args, **kwargs)
888
533
    def server_bind(self):
889
534
        """This overrides the normal server_bind() function
890
535
        to bind to an interface if one was specified, and also NOT to
891
536
        bind to an address or port if they were not specified."""
892
 
        if self.interface is not None:
 
537
        if self.settings["interface"]:
 
538
            # 25 is from /usr/include/asm-i486/socket.h
 
539
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
893
540
            try:
894
541
                self.socket.setsockopt(socket.SOL_SOCKET,
895
542
                                       SO_BINDTODEVICE,
896
 
                                       self.interface + '\0')
 
543
                                       self.settings["interface"])
897
544
            except socket.error, error:
898
545
                if error[0] == errno.EPERM:
899
546
                    logger.error(u"No permission to"
900
547
                                 u" bind to interface %s",
901
 
                                 self.interface)
 
548
                                 self.settings["interface"])
902
549
                else:
903
 
                    raise
 
550
                    raise error
904
551
        # Only bind(2) the socket if we really need to.
905
552
        if self.server_address[0] or self.server_address[1]:
906
553
            if not self.server_address[0]:
907
 
                if self.address_family == socket.AF_INET6:
908
 
                    any_address = "::" # in6addr_any
909
 
                else:
910
 
                    any_address = socket.INADDR_ANY
911
 
                self.server_address = (any_address,
 
554
                in6addr_any = "::"
 
555
                self.server_address = (in6addr_any,
912
556
                                       self.server_address[1])
913
557
            elif not self.server_address[1]:
914
558
                self.server_address = (self.server_address[0],
915
559
                                       0)
916
 
#                 if self.interface:
 
560
#                 if self.settings["interface"]:
917
561
#                     self.server_address = (self.server_address[0],
918
562
#                                            0, # port
919
563
#                                            0, # flowinfo
920
564
#                                            if_nametoindex
921
 
#                                            (self.interface))
922
 
            return SocketServer.TCPServer.server_bind(self)
 
565
#                                            (self.settings
 
566
#                                             ["interface"]))
 
567
            return super(type(self), self).server_bind()
923
568
    def server_activate(self):
924
569
        if self.enabled:
925
 
            return SocketServer.TCPServer.server_activate(self)
 
570
            return super(type(self), self).server_activate()
926
571
    def enable(self):
927
572
        self.enabled = True
928
 
    def handle_ipc(self, source, condition, file_objects={}):
929
 
        condition_names = {
930
 
            gobject.IO_IN: "IN", # There is data to read.
931
 
            gobject.IO_OUT: "OUT", # Data can be written (without
932
 
                                   # blocking).
933
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
934
 
            gobject.IO_ERR: "ERR", # Error condition.
935
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
936
 
                                   # broken, usually for pipes and
937
 
                                   # sockets).
938
 
            }
939
 
        conditions_string = ' | '.join(name
940
 
                                       for cond, name in
941
 
                                       condition_names.iteritems()
942
 
                                       if cond & condition)
943
 
        logger.debug("Handling IPC: FD = %d, condition = %s", source,
944
 
                     conditions_string)
945
 
        
946
 
        # Turn the pipe file descriptor into a Python file object
947
 
        if source not in file_objects:
948
 
            file_objects[source] = os.fdopen(source, "r", 1)
949
 
        
950
 
        # Read a line from the file object
951
 
        cmdline = file_objects[source].readline()
952
 
        if not cmdline:             # Empty line means end of file
953
 
            # close the IPC pipe
954
 
            file_objects[source].close()
955
 
            del file_objects[source]
956
 
            
957
 
            # Stop calling this function
958
 
            return False
959
 
        
960
 
        logger.debug("IPC command: %r", cmdline)
961
 
        
962
 
        # Parse and act on command
963
 
        cmd, args = cmdline.rstrip("\r\n").split(None, 1)
964
 
        
965
 
        if cmd == "NOTFOUND":
966
 
            logger.warning(u"Client not found for fingerprint: %s",
967
 
                           args)
968
 
            if self.use_dbus:
969
 
                # Emit D-Bus signal
970
 
                mandos_dbus_service.ClientNotFound(args)
971
 
        elif cmd == "INVALID":
972
 
            for client in self.clients:
973
 
                if client.name == args:
974
 
                    logger.warning(u"Client %s is invalid", args)
975
 
                    if self.use_dbus:
976
 
                        # Emit D-Bus signal
977
 
                        client.Rejected()
978
 
                    break
979
 
            else:
980
 
                logger.error(u"Unknown client %s is invalid", args)
981
 
        elif cmd == "SENDING":
982
 
            for client in self.clients:
983
 
                if client.name == args:
984
 
                    logger.info(u"Sending secret to %s", client.name)
985
 
                    client.checked_ok()
986
 
                    if self.use_dbus:
987
 
                        # Emit D-Bus signal
988
 
                        client.ReceivedSecret()
989
 
                    break
990
 
            else:
991
 
                logger.error(u"Sending secret to unknown client %s",
992
 
                             args)
993
 
        else:
994
 
            logger.error("Unknown IPC command: %r", cmdline)
995
 
        
996
 
        # Keep calling this function
997
 
        return True
998
573
 
999
574
 
1000
575
def string_to_delta(interval):
1001
576
    """Parse a string and return a datetime.timedelta
1002
 
    
 
577
 
1003
578
    >>> string_to_delta('7d')
1004
579
    datetime.timedelta(7)
1005
580
    >>> string_to_delta('60s')
1016
591
    timevalue = datetime.timedelta(0)
1017
592
    for s in interval.split():
1018
593
        try:
1019
 
            suffix = unicode(s[-1])
1020
 
            value = int(s[:-1])
 
594
            suffix=unicode(s[-1])
 
595
            value=int(s[:-1])
1021
596
            if suffix == u"d":
1022
597
                delta = datetime.timedelta(value)
1023
598
            elif suffix == u"s":
1057
632
    elif state == avahi.ENTRY_GROUP_FAILURE:
1058
633
        logger.critical(u"Avahi: Error in group state changed %s",
1059
634
                        unicode(error))
1060
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
635
        raise AvahiGroupError("State changed: %s", str(error))
1061
636
 
1062
637
def if_nametoindex(interface):
1063
638
    """Call the C function if_nametoindex(), or equivalent"""
1064
639
    global if_nametoindex
1065
640
    try:
1066
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1067
 
                          (ctypes.util.find_library("c"))
1068
 
                          .if_nametoindex)
 
641
        if "ctypes.util" not in sys.modules:
 
642
            import ctypes.util
 
643
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
644
            (ctypes.util.find_library("c")).if_nametoindex
1069
645
    except (OSError, AttributeError):
1070
646
        if "struct" not in sys.modules:
1071
647
            import struct
1074
650
        def if_nametoindex(interface):
1075
651
            "Get an interface index the hard way, i.e. using fcntl()"
1076
652
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
1077
 
            with closing(socket.socket()) as s:
1078
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1079
 
                                    struct.pack("16s16x", interface))
 
653
            s = socket.socket()
 
654
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
655
                                struct.pack("16s16x", interface))
 
656
            s.close()
1080
657
            interface_index = struct.unpack("I", ifreq[16:20])[0]
1081
658
            return interface_index
1082
659
    return if_nametoindex(interface)
1084
661
 
1085
662
def daemon(nochdir = False, noclose = False):
1086
663
    """See daemon(3).  Standard BSD Unix function.
1087
 
    
1088
664
    This should really exist as os.daemon, but it doesn't (yet)."""
1089
665
    if os.fork():
1090
666
        sys.exit()
1107
683
 
1108
684
 
1109
685
def main():
1110
 
    
1111
 
    ######################################################################
1112
 
    # Parsing of options, both command line and config file
1113
 
    
1114
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
686
    global main_loop_started
 
687
    main_loop_started = False
 
688
    
 
689
    parser = OptionParser(version = "%%prog %s" % version)
1115
690
    parser.add_option("-i", "--interface", type="string",
1116
691
                      metavar="IF", help="Bind to interface IF")
1117
692
    parser.add_option("-a", "--address", type="string",
1118
693
                      help="Address to listen for requests on")
1119
694
    parser.add_option("-p", "--port", type="int",
1120
695
                      help="Port number to receive requests on")
1121
 
    parser.add_option("--check", action="store_true",
 
696
    parser.add_option("--check", action="store_true", default=False,
1122
697
                      help="Run self-test")
1123
698
    parser.add_option("--debug", action="store_true",
1124
699
                      help="Debug mode; run in foreground and log to"
1131
706
                      default="/etc/mandos", metavar="DIR",
1132
707
                      help="Directory to search for configuration"
1133
708
                      " files")
1134
 
    parser.add_option("--no-dbus", action="store_false",
1135
 
                      dest="use_dbus",
1136
 
                      help="Do not provide D-Bus system bus"
1137
 
                      " interface")
1138
 
    parser.add_option("--no-ipv6", action="store_false",
1139
 
                      dest="use_ipv6", help="Do not use IPv6")
1140
 
    options = parser.parse_args()[0]
 
709
    (options, args) = parser.parse_args()
1141
710
    
1142
711
    if options.check:
1143
712
        import doctest
1152
721
                        "priority":
1153
722
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1154
723
                        "servicename": "Mandos",
1155
 
                        "use_dbus": "True",
1156
 
                        "use_ipv6": "True",
1157
724
                        }
1158
725
    
1159
726
    # Parse config file for server-global settings
1162
729
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
1163
730
    # Convert the SafeConfigParser object to a dict
1164
731
    server_settings = server_config.defaults()
1165
 
    # Use the appropriate methods on the non-string config options
1166
 
    server_settings["debug"] = server_config.getboolean("DEFAULT",
1167
 
                                                        "debug")
1168
 
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
1169
 
                                                           "use_dbus")
1170
 
    server_settings["use_ipv6"] = server_config.getboolean("DEFAULT",
1171
 
                                                           "use_ipv6")
1172
 
    if server_settings["port"]:
1173
 
        server_settings["port"] = server_config.getint("DEFAULT",
1174
 
                                                       "port")
 
732
    # Use getboolean on the boolean config option
 
733
    server_settings["debug"] = server_config.getboolean\
 
734
                               ("DEFAULT", "debug")
1175
735
    del server_config
1176
736
    
1177
737
    # Override the settings from the config file with command line
1178
738
    # options, if set.
1179
739
    for option in ("interface", "address", "port", "debug",
1180
 
                   "priority", "servicename", "configdir",
1181
 
                   "use_dbus", "use_ipv6"):
 
740
                   "priority", "servicename", "configdir"):
1182
741
        value = getattr(options, option)
1183
742
        if value is not None:
1184
743
            server_settings[option] = value
1185
744
    del options
1186
745
    # Now we have our good server settings in "server_settings"
1187
746
    
1188
 
    ##################################################################
1189
 
    
1190
 
    # For convenience
1191
747
    debug = server_settings["debug"]
1192
 
    use_dbus = server_settings["use_dbus"]
1193
 
    use_ipv6 = server_settings["use_ipv6"]
1194
748
    
1195
749
    if not debug:
1196
750
        syslogger.setLevel(logging.WARNING)
1197
751
        console.setLevel(logging.WARNING)
1198
752
    
1199
753
    if server_settings["servicename"] != "Mandos":
1200
 
        syslogger.setFormatter(logging.Formatter
1201
 
                               ('Mandos (%s) [%%(process)d]:'
1202
 
                                ' %%(levelname)s: %%(message)s'
 
754
        syslogger.setFormatter(logging.Formatter\
 
755
                               ('Mandos (%s): %%(levelname)s:'
 
756
                                ' %%(message)s'
1203
757
                                % server_settings["servicename"]))
1204
758
    
1205
759
    # Parse config file with clients
1206
760
    client_defaults = { "timeout": "1h",
1207
761
                        "interval": "5m",
1208
 
                        "checker": "fping -q -- %%(host)s",
 
762
                        "checker": "fping -q -- %(host)s",
1209
763
                        "host": "",
1210
764
                        }
1211
765
    client_config = ConfigParser.SafeConfigParser(client_defaults)
1212
766
    client_config.read(os.path.join(server_settings["configdir"],
1213
767
                                    "clients.conf"))
1214
 
 
1215
 
    global mandos_dbus_service
1216
 
    mandos_dbus_service = None
1217
768
    
1218
769
    clients = Set()
1219
770
    tcp_server = IPv6_TCPServer((server_settings["address"],
1220
771
                                 server_settings["port"]),
1221
 
                                ClientHandler,
1222
 
                                interface=
1223
 
                                server_settings["interface"],
1224
 
                                use_ipv6=use_ipv6,
1225
 
                                clients=clients,
1226
 
                                gnutls_priority=
1227
 
                                server_settings["priority"],
1228
 
                                use_dbus=use_dbus)
 
772
                                tcp_handler,
 
773
                                settings=server_settings,
 
774
                                clients=clients)
1229
775
    pidfilename = "/var/run/mandos.pid"
1230
776
    try:
1231
777
        pidfile = open(pidfilename, "w")
1232
 
    except IOError:
 
778
    except IOError, error:
1233
779
        logger.error("Could not open file %r", pidfilename)
1234
780
    
1235
 
    try:
1236
 
        uid = pwd.getpwnam("_mandos").pw_uid
1237
 
        gid = pwd.getpwnam("_mandos").pw_gid
1238
 
    except KeyError:
1239
 
        try:
1240
 
            uid = pwd.getpwnam("mandos").pw_uid
1241
 
            gid = pwd.getpwnam("mandos").pw_gid
1242
 
        except KeyError:
1243
 
            try:
1244
 
                uid = pwd.getpwnam("nobody").pw_uid
1245
 
                gid = pwd.getpwnam("nogroup").pw_gid
1246
 
            except KeyError:
1247
 
                uid = 65534
1248
 
                gid = 65534
1249
 
    try:
 
781
    uid = 65534
 
782
    gid = 65534
 
783
    try:
 
784
        uid = pwd.getpwnam("mandos").pw_uid
 
785
    except KeyError:
 
786
        try:
 
787
            uid = pwd.getpwnam("nobody").pw_uid
 
788
        except KeyError:
 
789
            pass
 
790
    try:
 
791
        gid = pwd.getpwnam("mandos").pw_gid
 
792
    except KeyError:
 
793
        try:
 
794
            gid = pwd.getpwnam("nogroup").pw_gid
 
795
        except KeyError:
 
796
            pass
 
797
    try:
 
798
        os.setuid(uid)
1250
799
        os.setgid(gid)
1251
 
        os.setuid(uid)
1252
800
    except OSError, error:
1253
801
        if error[0] != errno.EPERM:
1254
802
            raise error
1255
803
    
1256
 
    # Enable all possible GnuTLS debugging
1257
 
    if debug:
1258
 
        # "Use a log level over 10 to enable all debugging options."
1259
 
        # - GnuTLS manual
1260
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1261
 
        
1262
 
        @gnutls.library.types.gnutls_log_func
1263
 
        def debug_gnutls(level, string):
1264
 
            logger.debug("GnuTLS: %s", string[:-1])
1265
 
        
1266
 
        (gnutls.library.functions
1267
 
         .gnutls_global_set_log_function(debug_gnutls))
1268
 
    
1269
804
    global service
1270
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1271
805
    service = AvahiService(name = server_settings["servicename"],
1272
 
                           servicetype = "_mandos._tcp",
1273
 
                           protocol = protocol)
 
806
                           type = "_mandos._tcp", );
1274
807
    if server_settings["interface"]:
1275
 
        service.interface = (if_nametoindex
1276
 
                             (server_settings["interface"]))
 
808
        service.interface = if_nametoindex\
 
809
                            (server_settings["interface"])
1277
810
    
1278
811
    global main_loop
1279
812
    global bus
1286
819
                                           avahi.DBUS_PATH_SERVER),
1287
820
                            avahi.DBUS_INTERFACE_SERVER)
1288
821
    # End of Avahi example code
1289
 
    if use_dbus:
1290
 
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1291
 
    
1292
 
    client_class = Client
1293
 
    if use_dbus:
1294
 
        client_class = ClientDBus
1295
 
    clients.update(Set(
1296
 
            client_class(name = section,
1297
 
                         config= dict(client_config.items(section)))
1298
 
            for section in client_config.sections()))
 
822
    
 
823
    def remove_from_clients(client):
 
824
        clients.remove(client)
 
825
        if not clients:
 
826
            logger.critical(u"No clients left, exiting")
 
827
            sys.exit()
 
828
    
 
829
    clients.update(Set(Client(name = section,
 
830
                              stop_hook = remove_from_clients,
 
831
                              config
 
832
                              = dict(client_config.items(section)))
 
833
                       for section in client_config.sections()))
1299
834
    if not clients:
1300
 
        logger.warning(u"No clients defined")
 
835
        logger.critical(u"No clients defined")
 
836
        sys.exit(1)
1301
837
    
1302
838
    if debug:
1303
839
        # Redirect stdin so all checkers get /dev/null
1312
848
        daemon()
1313
849
    
1314
850
    try:
1315
 
        with closing(pidfile):
1316
 
            pid = os.getpid()
1317
 
            pidfile.write(str(pid) + "\n")
 
851
        pid = os.getpid()
 
852
        pidfile.write(str(pid) + "\n")
 
853
        pidfile.close()
1318
854
        del pidfile
1319
 
    except IOError:
 
855
    except IOError, err:
1320
856
        logger.error(u"Could not write to file %r with PID %d",
1321
857
                     pidfilename, pid)
1322
858
    except NameError:
1335
871
        
1336
872
        while clients:
1337
873
            client = clients.pop()
1338
 
            client.disable_hook = None
1339
 
            client.disable()
 
874
            client.stop_hook = None
 
875
            client.stop()
1340
876
    
1341
877
    atexit.register(cleanup)
1342
878
    
1345
881
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1346
882
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1347
883
    
1348
 
    if use_dbus:
1349
 
        class MandosDBusService(dbus.service.Object):
1350
 
            """A D-Bus proxy object"""
1351
 
            def __init__(self):
1352
 
                dbus.service.Object.__init__(self, bus, "/")
1353
 
            _interface = u"se.bsnet.fukt.Mandos"
1354
 
            
1355
 
            @dbus.service.signal(_interface, signature="oa{sv}")
1356
 
            def ClientAdded(self, objpath, properties):
1357
 
                "D-Bus signal"
1358
 
                pass
1359
 
            
1360
 
            @dbus.service.signal(_interface, signature="s")
1361
 
            def ClientNotFound(self, fingerprint):
1362
 
                "D-Bus signal"
1363
 
                pass
1364
 
            
1365
 
            @dbus.service.signal(_interface, signature="os")
1366
 
            def ClientRemoved(self, objpath, name):
1367
 
                "D-Bus signal"
1368
 
                pass
1369
 
            
1370
 
            @dbus.service.method(_interface, out_signature="ao")
1371
 
            def GetAllClients(self):
1372
 
                "D-Bus method"
1373
 
                return dbus.Array(c.dbus_object_path for c in clients)
1374
 
            
1375
 
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1376
 
            def GetAllClientsWithProperties(self):
1377
 
                "D-Bus method"
1378
 
                return dbus.Dictionary(
1379
 
                    ((c.dbus_object_path, c.GetAllProperties())
1380
 
                     for c in clients),
1381
 
                    signature="oa{sv}")
1382
 
            
1383
 
            @dbus.service.method(_interface, in_signature="o")
1384
 
            def RemoveClient(self, object_path):
1385
 
                "D-Bus method"
1386
 
                for c in clients:
1387
 
                    if c.dbus_object_path == object_path:
1388
 
                        clients.remove(c)
1389
 
                        c.remove_from_connection()
1390
 
                        # Don't signal anything except ClientRemoved
1391
 
                        c.disable(signal=False)
1392
 
                        # Emit D-Bus signal
1393
 
                        self.ClientRemoved(object_path, c.name)
1394
 
                        return
1395
 
                raise KeyError
1396
 
            
1397
 
            del _interface
1398
 
        
1399
 
        mandos_dbus_service = MandosDBusService()
1400
 
    
1401
884
    for client in clients:
1402
 
        if use_dbus:
1403
 
            # Emit D-Bus signal
1404
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path,
1405
 
                                            client.GetAllProperties())
1406
 
        client.enable()
 
885
        client.start()
1407
886
    
1408
887
    tcp_server.enable()
1409
888
    tcp_server.server_activate()
1410
889
    
1411
890
    # Find out what port we got
1412
891
    service.port = tcp_server.socket.getsockname()[1]
1413
 
    if use_ipv6:
1414
 
        logger.info(u"Now listening on address %r, port %d,"
1415
 
                    " flowinfo %d, scope_id %d"
1416
 
                    % tcp_server.socket.getsockname())
1417
 
    else:                       # IPv4
1418
 
        logger.info(u"Now listening on address %r, port %d"
1419
 
                    % tcp_server.socket.getsockname())
 
892
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
893
                u" scope_id %d" % tcp_server.socket.getsockname())
1420
894
    
1421
895
    #service.interface = tcp_server.socket.getsockname()[3]
1422
896
    
1432
906
        
1433
907
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1434
908
                             lambda *args, **kwargs:
1435
 
                             (tcp_server.handle_request
1436
 
                              (*args[2:], **kwargs) or True))
 
909
                             tcp_server.handle_request\
 
910
                             (*args[2:], **kwargs) or True)
1437
911
        
1438
912
        logger.debug(u"Starting main loop")
 
913
        main_loop_started = True
1439
914
        main_loop.run()
1440
915
    except AvahiError, error:
1441
 
        logger.critical(u"AvahiError: %s", error)
 
916
        logger.critical(u"AvahiError: %s" + unicode(error))
1442
917
        sys.exit(1)
1443
918
    except KeyboardInterrupt:
1444
919
        if debug:
1445
 
            print >> sys.stderr
1446
 
        logger.debug("Server received KeyboardInterrupt")
1447
 
    logger.debug("Server exiting")
 
920
            print
1448
921
 
1449
922
if __name__ == '__main__':
1450
923
    main()