/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2008-09-30 07:23:39 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080930072339-jn15gyrtfpdk2dhx
* .bzrignore: Added "man" directory (created by "make install-html").

* Makefile: Add "common.ent" dependency to all manual pages.
  (htmldir, version, SED): New variables.
  (CFLAGS): Add -D option to define VERSION to $(version).
  (MANPOST, HTMLPOST): Use $(SED).
  (PROGS): Use $(CPROGS)
  (CPROGS): New; C-only programs.
  (objects): Use $(CPROGS).
  (common.ent, mandos, mandos-keygen): New targets; update version
                                       number to $(version).
  (clean): Use $(CPROGS).
  (check): Depend on "all".
  (install-html): Install to $(htmldir).

* common.ent: New file with "version" entity.

* mandos-clients.conf.xml: Use "common.ent".
* mandos-keygen.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-runner.xml: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.xml: - '' -

* plugin-runner.c (argp_program_version): Use VERSION.
* plugins.d/mandos-client.c (argp_program_version): - '' -
* plugins.d/password-prompt.c (argp_program_version): - '' -

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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 © 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
from optparse import OptionParser
39
38
import datetime
40
39
import errno
41
40
import gnutls.crypto
56
55
import logging
57
56
import logging.handlers
58
57
import pwd
59
 
from contextlib import closing
60
58
 
61
59
import dbus
62
 
import dbus.service
63
60
import gobject
64
61
import avahi
65
62
from dbus.mainloop.glib import DBusGMainLoop
66
63
import ctypes
67
64
import ctypes.util
68
65
 
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"
 
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
        super(AvahiError, self).__init__()
 
85
    def __str__(self):
 
86
        return repr(self.value)
101
87
 
102
88
class AvahiServiceError(AvahiError):
103
89
    pass
108
94
 
109
95
class AvahiService(object):
110
96
    """An Avahi (Zeroconf) service.
111
 
    
112
97
    Attributes:
113
98
    interface: integer; avahi.IF_UNSPEC or an interface index.
114
99
               Used to optionally bind to the specified interface.
124
109
                  a sensible number of times
125
110
    """
126
111
    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):
 
112
                 servicetype = None, port = None, TXT = None, domain = "",
 
113
                 host = "", max_renames = 32768):
130
114
        self.interface = interface
131
115
        self.name = name
132
116
        self.type = servicetype
133
117
        self.port = port
134
 
        self.TXT = TXT if TXT is not None else []
 
118
        if TXT is None:
 
119
            self.TXT = []
 
120
        else:
 
121
            self.TXT = TXT
135
122
        self.domain = domain
136
123
        self.host = host
137
124
        self.rename_count = 0
138
125
        self.max_renames = max_renames
139
 
        self.protocol = protocol
140
126
    def rename(self):
141
127
        """Derived from the Avahi example code"""
142
128
        if self.rename_count >= self.max_renames:
143
129
            logger.critical(u"No suitable Zeroconf service name found"
144
130
                            u" after %i retries, exiting.",
145
131
                            self.rename_count)
146
 
            raise AvahiServiceError(u"Too many renames")
 
132
            raise AvahiServiceError("Too many renames")
147
133
        self.name = server.GetAlternativeServiceName(self.name)
148
134
        logger.info(u"Changing Zeroconf service name to %r ...",
149
135
                    str(self.name))
150
 
        syslogger.setFormatter(logging.Formatter
151
 
                               ('Mandos (%s) [%%(process)d]:'
152
 
                                ' %%(levelname)s: %%(message)s'
153
 
                                % self.name))
 
136
        syslogger.setFormatter(logging.Formatter\
 
137
                               ('Mandos (%s): %%(levelname)s:'
 
138
                               ' %%(message)s' % self.name))
154
139
        self.remove()
155
140
        self.add()
156
141
        self.rename_count += 1
162
147
        """Derived from the Avahi example code"""
163
148
        global group
164
149
        if group is None:
165
 
            group = dbus.Interface(bus.get_object
166
 
                                   (avahi.DBUS_NAME,
 
150
            group = dbus.Interface\
 
151
                    (bus.get_object(avahi.DBUS_NAME,
167
152
                                    server.EntryGroupNew()),
168
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
153
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
169
154
            group.connect_to_signal('StateChanged',
170
155
                                    entry_group_state_changed)
171
156
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
172
157
                     service.name, service.type)
173
158
        group.AddService(
174
159
                self.interface,         # interface
175
 
                self.protocol,          # protocol
 
160
                avahi.PROTO_INET6,      # protocol
176
161
                dbus.UInt32(0),         # flags
177
162
                self.name, self.type,
178
163
                self.domain, self.host,
185
170
# End of Avahi example code
186
171
 
187
172
 
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
173
class Client(object):
194
174
    """A representation of a client host served by this server.
195
 
    
196
175
    Attributes:
197
 
    name:       string; from the config file, used in log messages and
198
 
                        D-Bus identifiers
 
176
    name:      string; from the config file, used in log messages
199
177
    fingerprint: string (40 or 32 hexadecimal digits); used to
200
178
                 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.
 
179
    secret:    bytestring; sent verbatim (over TLS) to client
 
180
    host:      string; available for use by the checker command
 
181
    created:   datetime.datetime(); object creation, not client host
 
182
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
183
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
184
                                     until this client is invalid
 
185
    interval:  datetime.timedelta(); How often to start a new checker
 
186
    stop_hook: If set, called by stop() as stop_hook(self)
 
187
    checker:   subprocess.Popen(); a running checker process used
 
188
                                   to see if the client lives.
 
189
                                   'None' if no process is running.
214
190
    checker_initiator_tag: a gobject event source tag, or None
215
 
    disable_initiator_tag:    - '' -
 
191
    stop_initiator_tag:    - '' -
216
192
    checker_callback_tag:  - '' -
217
193
    checker_command: string; External command which is run to check if
218
194
                     client lives.  %() expansions are done at
219
195
                     runtime with vars(self) as dict, so that for
220
196
                     instance %(name)s can be used in the command.
221
 
    current_checker_command: string; current running checker_command
 
197
    Private attibutes:
 
198
    _timeout: Real variable for 'timeout'
 
199
    _interval: Real variable for 'interval'
 
200
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
201
    _interval_milliseconds: - '' -
222
202
    """
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):
 
203
    def _set_timeout(self, timeout):
 
204
        "Setter function for 'timeout' attribute"
 
205
        self._timeout = timeout
 
206
        self._timeout_milliseconds = ((self.timeout.days
 
207
                                       * 24 * 60 * 60 * 1000)
 
208
                                      + (self.timeout.seconds * 1000)
 
209
                                      + (self.timeout.microseconds
 
210
                                         // 1000))
 
211
    timeout = property(lambda self: self._timeout,
 
212
                       _set_timeout)
 
213
    del _set_timeout
 
214
    def _set_interval(self, interval):
 
215
        "Setter function for 'interval' attribute"
 
216
        self._interval = interval
 
217
        self._interval_milliseconds = ((self.interval.days
 
218
                                        * 24 * 60 * 60 * 1000)
 
219
                                       + (self.interval.seconds
 
220
                                          * 1000)
 
221
                                       + (self.interval.microseconds
 
222
                                          // 1000))
 
223
    interval = property(lambda self: self._interval,
 
224
                        _set_interval)
 
225
    del _set_interval
 
226
    def __init__(self, name = None, stop_hook=None, config=None):
236
227
        """Note: the 'checker' key in 'config' sets the
237
228
        'checker_command' attribute and *not* the 'checker'
238
229
        attribute."""
239
 
        self.name = name
240
230
        if config is None:
241
231
            config = {}
 
232
        self.name = name
242
233
        logger.debug(u"Creating client %r", self.name)
243
234
        # Uppercase and remove spaces from fingerprint for later
244
235
        # comparison purposes with return value from the fingerprint()
245
236
        # function
246
 
        self.fingerprint = (config["fingerprint"].upper()
247
 
                            .replace(u" ", u""))
 
237
        self.fingerprint = config["fingerprint"].upper()\
 
238
                           .replace(u" ", u"")
248
239
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
249
240
        if "secret" in config:
250
241
            self.secret = config["secret"].decode(u"base64")
251
242
        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()
 
243
            secfile = open(config["secfile"])
 
244
            self.secret = secfile.read()
 
245
            secfile.close()
256
246
        else:
257
247
            raise TypeError(u"No secret or secfile for client %s"
258
248
                            % self.name)
259
249
        self.host = config.get("host", "")
260
 
        self.created = datetime.datetime.utcnow()
261
 
        self.enabled = False
262
 
        self.last_enabled = None
 
250
        self.created = datetime.datetime.now()
263
251
        self.last_checked_ok = None
264
252
        self.timeout = string_to_delta(config["timeout"])
265
253
        self.interval = string_to_delta(config["interval"])
266
 
        self.disable_hook = disable_hook
 
254
        self.stop_hook = stop_hook
267
255
        self.checker = None
268
256
        self.checker_initiator_tag = None
269
 
        self.disable_initiator_tag = None
 
257
        self.stop_initiator_tag = None
270
258
        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):
 
259
        self.check_command = config["checker"]
 
260
    def start(self):
276
261
        """Start this client's checker and timeout hooks"""
277
 
        self.last_enabled = datetime.datetime.utcnow()
278
262
        # Schedule a new checker to be started an 'interval' from now,
279
263
        # and every interval from then on.
280
 
        self.checker_initiator_tag = (gobject.timeout_add
281
 
                                      (self.interval_milliseconds(),
282
 
                                       self.start_checker))
 
264
        self.checker_initiator_tag = gobject.timeout_add\
 
265
                                     (self._interval_milliseconds,
 
266
                                      self.start_checker)
283
267
        # Also start a new checker *right now*.
284
268
        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):
 
269
        # Schedule a stop() when 'timeout' has passed
 
270
        self.stop_initiator_tag = gobject.timeout_add\
 
271
                                  (self._timeout_milliseconds,
 
272
                                   self.stop)
 
273
    def stop(self):
 
274
        """Stop this client.
 
275
        The possibility that a client might be restarted is left open,
 
276
        but not currently used."""
 
277
        # If this client doesn't have a secret, it is already stopped.
 
278
        if hasattr(self, "secret") and self.secret:
 
279
            logger.info(u"Stopping client %s", self.name)
 
280
            self.secret = None
 
281
        else:
294
282
            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
 
283
        if getattr(self, "stop_initiator_tag", False):
 
284
            gobject.source_remove(self.stop_initiator_tag)
 
285
            self.stop_initiator_tag = None
299
286
        if getattr(self, "checker_initiator_tag", False):
300
287
            gobject.source_remove(self.checker_initiator_tag)
301
288
            self.checker_initiator_tag = None
302
289
        self.stop_checker()
303
 
        if self.disable_hook:
304
 
            self.disable_hook(self)
305
 
        self.enabled = False
 
290
        if self.stop_hook:
 
291
            self.stop_hook(self)
306
292
        # Do not run this again if called by a gobject.timeout_add
307
293
        return False
308
 
    
309
294
    def __del__(self):
310
 
        self.disable_hook = None
311
 
        self.disable()
312
 
    
313
 
    def checker_callback(self, pid, condition, command):
 
295
        self.stop_hook = None
 
296
        self.stop()
 
297
    def checker_callback(self, pid, condition):
314
298
        """The checker has completed, so take appropriate actions."""
 
299
        now = datetime.datetime.now()
315
300
        self.checker_callback_tag = None
316
301
        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:
 
302
        if os.WIFEXITED(condition) \
 
303
               and (os.WEXITSTATUS(condition) == 0):
 
304
            logger.info(u"Checker for %(name)s succeeded",
 
305
                        vars(self))
 
306
            self.last_checked_ok = now
 
307
            gobject.source_remove(self.stop_initiator_tag)
 
308
            self.stop_initiator_tag = gobject.timeout_add\
 
309
                                      (self._timeout_milliseconds,
 
310
                                       self.stop)
 
311
        elif not os.WIFEXITED(condition):
327
312
            logger.warning(u"Checker for %(name)s crashed?",
328
313
                           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
 
    
 
314
        else:
 
315
            logger.info(u"Checker for %(name)s failed",
 
316
                        vars(self))
342
317
    def start_checker(self):
343
318
        """Start a new checker subprocess if one is not running.
344
 
        
345
319
        If a checker already exists, leave it running and do
346
320
        nothing."""
347
321
        # The reason for not killing a running checker is that if we
352
326
        # checkers alone, the checker would have to take more time
353
327
        # than 'timeout' for the client to be declared invalid, which
354
328
        # 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
329
        if self.checker is None:
366
330
            try:
367
 
                # In case checker_command has exactly one % operator
368
 
                command = self.checker_command % self.host
 
331
                # In case check_command has exactly one % operator
 
332
                command = self.check_command % self.host
369
333
            except TypeError:
370
334
                # Escape attributes for the shell
371
335
                escaped_attrs = dict((key, re.escape(str(val)))
372
336
                                     for key, val in
373
337
                                     vars(self).iteritems())
374
338
                try:
375
 
                    command = self.checker_command % escaped_attrs
 
339
                    command = self.check_command % escaped_attrs
376
340
                except TypeError, error:
377
341
                    logger.error(u'Could not format string "%s":'
378
 
                                 u' %s', self.checker_command, error)
 
342
                                 u' %s', self.check_command, error)
379
343
                    return True # Try again later
380
 
            self.current_checker_command = command
381
344
            try:
382
345
                logger.info(u"Starting checker %r for %s",
383
346
                            command, self.name)
388
351
                self.checker = subprocess.Popen(command,
389
352
                                                close_fds=True,
390
353
                                                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)
 
354
                self.checker_callback_tag = gobject.child_watch_add\
 
355
                                            (self.checker.pid,
 
356
                                             self.checker_callback)
401
357
            except OSError, error:
402
358
                logger.error(u"Failed to start subprocess: %s",
403
359
                             error)
404
360
        # Re-run this periodically if run by gobject.timeout_add
405
361
        return True
406
 
    
407
362
    def stop_checker(self):
408
363
        """Force the checker process, if any, to stop."""
409
364
        if self.checker_callback_tag:
421
376
            if error.errno != errno.ESRCH: # No such process
422
377
                raise
423
378
        self.checker = None
424
 
    
425
379
    def still_valid(self):
426
380
        """Has the timeout not yet passed for this client?"""
427
 
        if not getattr(self, "enabled", False):
428
 
            return False
429
 
        now = datetime.datetime.utcnow()
 
381
        now = datetime.datetime.now()
430
382
        if self.last_checked_ok is None:
431
383
            return now < (self.created + self.timeout)
432
384
        else:
433
385
            return now < (self.last_checked_ok + self.timeout)
434
386
 
435
387
 
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.
 
388
def peer_certificate(session):
 
389
    "Return the peer's OpenPGP certificate as a bytestring"
 
390
    # If not an OpenPGP certificate...
 
391
    if gnutls.library.functions.gnutls_certificate_type_get\
 
392
            (session._c_object) \
 
393
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
394
        # ...do the normal thing
 
395
        return session.peer_certificate
 
396
    list_size = ctypes.c_uint()
 
397
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
398
        (session._c_object, ctypes.byref(list_size))
 
399
    if list_size.value == 0:
 
400
        return None
 
401
    cert = cert_list[0]
 
402
    return ctypes.string_at(cert.data, cert.size)
 
403
 
 
404
 
 
405
def fingerprint(openpgp):
 
406
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
407
    # New GnuTLS "datum" with the OpenPGP public key
 
408
    datum = gnutls.library.types.gnutls_datum_t\
 
409
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
410
                     ctypes.POINTER(ctypes.c_ubyte)),
 
411
         ctypes.c_uint(len(openpgp)))
 
412
    # New empty GnuTLS certificate
 
413
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
414
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
415
        (ctypes.byref(crt))
 
416
    # Import the OpenPGP public key into the certificate
 
417
    gnutls.library.functions.gnutls_openpgp_crt_import\
 
418
                    (crt, ctypes.byref(datum),
 
419
                     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
    # New buffer for the fingerprint
 
428
    buf = ctypes.create_string_buffer(20)
 
429
    buf_len = ctypes.c_size_t()
 
430
    # Get the fingerprint from the certificate into the buffer
 
431
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
432
        (crt, ctypes.byref(buf), ctypes.byref(buf_len))
 
433
    # Deinit the certificate
 
434
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
435
    # Convert the buffer to a Python bytestring
 
436
    fpr = ctypes.string_at(buf, buf_len.value)
 
437
    # Convert the bytestring to hexadecimal notation
 
438
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
439
    return hex_fpr
 
440
 
 
441
 
 
442
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
443
    """A TCP request handler class.
 
444
    Instantiated by IPv6_TCPServer for each request to handle it.
695
445
    Note: This will run in its own forked process."""
696
446
    
697
447
    def handle(self):
698
448
        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
 
    
 
449
                     unicode(self.client_address))
 
450
        session = gnutls.connection.ClientSession\
 
451
                  (self.request, gnutls.connection.X509Credentials())
 
452
        
 
453
        line = self.request.makefile().readline()
 
454
        logger.debug(u"Protocol version: %r", line)
 
455
        try:
 
456
            if int(line.strip().split()[0]) > 1:
 
457
                raise RuntimeError
 
458
        except (ValueError, IndexError, RuntimeError), error:
 
459
            logger.error(u"Unknown protocol version: %s", error)
 
460
            return
 
461
        
 
462
        # Note: gnutls.connection.X509Credentials is really a generic
 
463
        # GnuTLS certificate credentials object so long as no X.509
 
464
        # keys are added to it.  Therefore, we can use it here despite
 
465
        # using OpenPGP certificates.
 
466
        
 
467
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
468
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
469
        #                "+DHE-DSS"))
 
470
        priority = "NORMAL"             # Fallback default, since this
 
471
                                        # MUST be set.
 
472
        if self.server.settings["priority"]:
 
473
            priority = self.server.settings["priority"]
 
474
        gnutls.library.functions.gnutls_priority_set_direct\
 
475
            (session._c_object, priority, None)
 
476
        
 
477
        try:
 
478
            session.handshake()
 
479
        except gnutls.errors.GNUTLSError, error:
 
480
            logger.warning(u"Handshake failed: %s", error)
 
481
            # Do not run session.bye() here: the session is not
 
482
            # established.  Just abandon the request.
 
483
            return
 
484
        try:
 
485
            fpr = fingerprint(peer_certificate(session))
 
486
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
487
            logger.warning(u"Bad certificate: %s", error)
 
488
            session.bye()
 
489
            return
 
490
        logger.debug(u"Fingerprint: %s", fpr)
 
491
        client = None
 
492
        for c in self.server.clients:
 
493
            if c.fingerprint == fpr:
 
494
                client = c
 
495
                break
 
496
        if not client:
 
497
            logger.warning(u"Client not found for fingerprint: %s",
 
498
                           fpr)
 
499
            session.bye()
 
500
            return
 
501
        # Have to check if client.still_valid(), since it is possible
 
502
        # that the client timed out while establishing the GnuTLS
 
503
        # session.
 
504
        if not client.still_valid():
 
505
            logger.warning(u"Client %(name)s is invalid",
 
506
                           vars(client))
 
507
            session.bye()
 
508
            return
 
509
        sent_size = 0
 
510
        while sent_size < len(client.secret):
 
511
            sent = session.send(client.secret[sent_size:])
 
512
            logger.debug(u"Sent: %d, remaining: %d",
 
513
                         sent, len(client.secret)
 
514
                         - (sent_size + sent))
 
515
            sent_size += sent
 
516
        session.bye()
 
517
 
 
518
 
 
519
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
520
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
867
521
    Attributes:
 
522
        settings:       Server settings
 
523
        clients:        Set() of Client objects
868
524
        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
525
    """
876
 
    def __init__(self, server_address, RequestHandlerClass,
877
 
                 interface=None, use_ipv6=True, clients=None,
878
 
                 gnutls_priority=None, use_dbus=True):
 
526
    address_family = socket.AF_INET6
 
527
    def __init__(self, *args, **kwargs):
 
528
        if "settings" in kwargs:
 
529
            self.settings = kwargs["settings"]
 
530
            del kwargs["settings"]
 
531
        if "clients" in kwargs:
 
532
            self.clients = kwargs["clients"]
 
533
            del kwargs["clients"]
879
534
        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)
 
535
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
888
536
    def server_bind(self):
889
537
        """This overrides the normal server_bind() function
890
538
        to bind to an interface if one was specified, and also NOT to
891
539
        bind to an address or port if they were not specified."""
892
 
        if self.interface is not None:
 
540
        if self.settings["interface"]:
 
541
            # 25 is from /usr/include/asm-i486/socket.h
 
542
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
893
543
            try:
894
544
                self.socket.setsockopt(socket.SOL_SOCKET,
895
545
                                       SO_BINDTODEVICE,
896
 
                                       self.interface + '\0')
 
546
                                       self.settings["interface"])
897
547
            except socket.error, error:
898
548
                if error[0] == errno.EPERM:
899
549
                    logger.error(u"No permission to"
900
550
                                 u" bind to interface %s",
901
 
                                 self.interface)
 
551
                                 self.settings["interface"])
902
552
                else:
903
 
                    raise
 
553
                    raise error
904
554
        # Only bind(2) the socket if we really need to.
905
555
        if self.server_address[0] or self.server_address[1]:
906
556
            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,
 
557
                in6addr_any = "::"
 
558
                self.server_address = (in6addr_any,
912
559
                                       self.server_address[1])
913
560
            elif not self.server_address[1]:
914
561
                self.server_address = (self.server_address[0],
915
562
                                       0)
916
 
#                 if self.interface:
 
563
#                 if self.settings["interface"]:
917
564
#                     self.server_address = (self.server_address[0],
918
565
#                                            0, # port
919
566
#                                            0, # flowinfo
920
567
#                                            if_nametoindex
921
 
#                                            (self.interface))
922
 
            return SocketServer.TCPServer.server_bind(self)
 
568
#                                            (self.settings
 
569
#                                             ["interface"]))
 
570
            return super(IPv6_TCPServer, self).server_bind()
923
571
    def server_activate(self):
924
572
        if self.enabled:
925
 
            return SocketServer.TCPServer.server_activate(self)
 
573
            return super(IPv6_TCPServer, self).server_activate()
926
574
    def enable(self):
927
575
        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
576
 
999
577
 
1000
578
def string_to_delta(interval):
1001
579
    """Parse a string and return a datetime.timedelta
1002
 
    
 
580
 
1003
581
    >>> string_to_delta('7d')
1004
582
    datetime.timedelta(7)
1005
583
    >>> string_to_delta('60s')
1057
635
    elif state == avahi.ENTRY_GROUP_FAILURE:
1058
636
        logger.critical(u"Avahi: Error in group state changed %s",
1059
637
                        unicode(error))
1060
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
638
        raise AvahiGroupError("State changed: %s", str(error))
1061
639
 
1062
640
def if_nametoindex(interface):
1063
641
    """Call the C function if_nametoindex(), or equivalent"""
1064
642
    global if_nametoindex
1065
643
    try:
1066
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
1067
 
                          (ctypes.util.find_library("c"))
1068
 
                          .if_nametoindex)
 
644
        if_nametoindex = ctypes.cdll.LoadLibrary\
 
645
            (ctypes.util.find_library("c")).if_nametoindex
1069
646
    except (OSError, AttributeError):
1070
647
        if "struct" not in sys.modules:
1071
648
            import struct
1074
651
        def if_nametoindex(interface):
1075
652
            "Get an interface index the hard way, i.e. using fcntl()"
1076
653
            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))
 
654
            s = socket.socket()
 
655
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
656
                                struct.pack("16s16x", interface))
 
657
            s.close()
1080
658
            interface_index = struct.unpack("I", ifreq[16:20])[0]
1081
659
            return interface_index
1082
660
    return if_nametoindex(interface)
1084
662
 
1085
663
def daemon(nochdir = False, noclose = False):
1086
664
    """See daemon(3).  Standard BSD Unix function.
1087
 
    
1088
665
    This should really exist as os.daemon, but it doesn't (yet)."""
1089
666
    if os.fork():
1090
667
        sys.exit()
1107
684
 
1108
685
 
1109
686
def main():
1110
 
    
1111
 
    ######################################################################
1112
 
    # Parsing of options, both command line and config file
1113
 
    
1114
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
687
    parser = OptionParser(version = "%%prog %s" % version)
1115
688
    parser.add_option("-i", "--interface", type="string",
1116
689
                      metavar="IF", help="Bind to interface IF")
1117
690
    parser.add_option("-a", "--address", type="string",
1118
691
                      help="Address to listen for requests on")
1119
692
    parser.add_option("-p", "--port", type="int",
1120
693
                      help="Port number to receive requests on")
1121
 
    parser.add_option("--check", action="store_true",
 
694
    parser.add_option("--check", action="store_true", default=False,
1122
695
                      help="Run self-test")
1123
696
    parser.add_option("--debug", action="store_true",
1124
697
                      help="Debug mode; run in foreground and log to"
1131
704
                      default="/etc/mandos", metavar="DIR",
1132
705
                      help="Directory to search for configuration"
1133
706
                      " 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
707
    options = parser.parse_args()[0]
1141
708
    
1142
709
    if options.check:
1152
719
                        "priority":
1153
720
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1154
721
                        "servicename": "Mandos",
1155
 
                        "use_dbus": "True",
1156
 
                        "use_ipv6": "True",
1157
722
                        }
1158
723
    
1159
724
    # Parse config file for server-global settings
1162
727
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
1163
728
    # Convert the SafeConfigParser object to a dict
1164
729
    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")
 
730
    # Use getboolean on the boolean config option
 
731
    server_settings["debug"] = server_config.getboolean\
 
732
                               ("DEFAULT", "debug")
1175
733
    del server_config
1176
734
    
1177
735
    # Override the settings from the config file with command line
1178
736
    # options, if set.
1179
737
    for option in ("interface", "address", "port", "debug",
1180
 
                   "priority", "servicename", "configdir",
1181
 
                   "use_dbus", "use_ipv6"):
 
738
                   "priority", "servicename", "configdir"):
1182
739
        value = getattr(options, option)
1183
740
        if value is not None:
1184
741
            server_settings[option] = value
1185
742
    del options
1186
743
    # Now we have our good server settings in "server_settings"
1187
744
    
1188
 
    ##################################################################
1189
 
    
1190
 
    # For convenience
1191
745
    debug = server_settings["debug"]
1192
 
    use_dbus = server_settings["use_dbus"]
1193
 
    use_ipv6 = server_settings["use_ipv6"]
1194
746
    
1195
747
    if not debug:
1196
748
        syslogger.setLevel(logging.WARNING)
1197
749
        console.setLevel(logging.WARNING)
1198
750
    
1199
751
    if server_settings["servicename"] != "Mandos":
1200
 
        syslogger.setFormatter(logging.Formatter
1201
 
                               ('Mandos (%s) [%%(process)d]:'
1202
 
                                ' %%(levelname)s: %%(message)s'
 
752
        syslogger.setFormatter(logging.Formatter\
 
753
                               ('Mandos (%s): %%(levelname)s:'
 
754
                                ' %%(message)s'
1203
755
                                % server_settings["servicename"]))
1204
756
    
1205
757
    # Parse config file with clients
1206
758
    client_defaults = { "timeout": "1h",
1207
759
                        "interval": "5m",
1208
 
                        "checker": "fping -q -- %%(host)s",
 
760
                        "checker": "fping -q -- %(host)s",
1209
761
                        "host": "",
1210
762
                        }
1211
763
    client_config = ConfigParser.SafeConfigParser(client_defaults)
1212
764
    client_config.read(os.path.join(server_settings["configdir"],
1213
765
                                    "clients.conf"))
1214
 
 
1215
 
    global mandos_dbus_service
1216
 
    mandos_dbus_service = None
1217
766
    
1218
767
    clients = Set()
1219
768
    tcp_server = IPv6_TCPServer((server_settings["address"],
1220
769
                                 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)
 
770
                                TCP_handler,
 
771
                                settings=server_settings,
 
772
                                clients=clients)
1229
773
    pidfilename = "/var/run/mandos.pid"
1230
774
    try:
1231
775
        pidfile = open(pidfilename, "w")
1232
 
    except IOError:
 
776
    except IOError, error:
1233
777
        logger.error("Could not open file %r", pidfilename)
1234
778
    
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:
 
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)
1250
797
        os.setgid(gid)
1251
 
        os.setuid(uid)
1252
798
    except OSError, error:
1253
799
        if error[0] != errno.EPERM:
1254
800
            raise error
1255
801
    
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
802
    global service
1270
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1271
803
    service = AvahiService(name = server_settings["servicename"],
1272
 
                           servicetype = "_mandos._tcp",
1273
 
                           protocol = protocol)
 
804
                           servicetype = "_mandos._tcp", )
1274
805
    if server_settings["interface"]:
1275
 
        service.interface = (if_nametoindex
1276
 
                             (server_settings["interface"]))
 
806
        service.interface = if_nametoindex\
 
807
                            (server_settings["interface"])
1277
808
    
1278
809
    global main_loop
1279
810
    global bus
1286
817
                                           avahi.DBUS_PATH_SERVER),
1287
818
                            avahi.DBUS_INTERFACE_SERVER)
1288
819
    # 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()))
 
820
    
 
821
    def remove_from_clients(client):
 
822
        clients.remove(client)
 
823
        if not clients:
 
824
            logger.critical(u"No clients left, exiting")
 
825
            sys.exit()
 
826
    
 
827
    clients.update(Set(Client(name = section,
 
828
                              stop_hook = remove_from_clients,
 
829
                              config
 
830
                              = dict(client_config.items(section)))
 
831
                       for section in client_config.sections()))
1299
832
    if not clients:
1300
 
        logger.warning(u"No clients defined")
 
833
        logger.critical(u"No clients defined")
 
834
        sys.exit(1)
1301
835
    
1302
836
    if debug:
1303
837
        # Redirect stdin so all checkers get /dev/null
1312
846
        daemon()
1313
847
    
1314
848
    try:
1315
 
        with closing(pidfile):
1316
 
            pid = os.getpid()
1317
 
            pidfile.write(str(pid) + "\n")
 
849
        pid = os.getpid()
 
850
        pidfile.write(str(pid) + "\n")
 
851
        pidfile.close()
1318
852
        del pidfile
1319
853
    except IOError:
1320
854
        logger.error(u"Could not write to file %r with PID %d",
1335
869
        
1336
870
        while clients:
1337
871
            client = clients.pop()
1338
 
            client.disable_hook = None
1339
 
            client.disable()
 
872
            client.stop_hook = None
 
873
            client.stop()
1340
874
    
1341
875
    atexit.register(cleanup)
1342
876
    
1345
879
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1346
880
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1347
881
    
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
882
    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()
 
883
        client.start()
1407
884
    
1408
885
    tcp_server.enable()
1409
886
    tcp_server.server_activate()
1410
887
    
1411
888
    # Find out what port we got
1412
889
    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())
 
890
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
891
                u" scope_id %d" % tcp_server.socket.getsockname())
1420
892
    
1421
893
    #service.interface = tcp_server.socket.getsockname()[3]
1422
894
    
1432
904
        
1433
905
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1434
906
                             lambda *args, **kwargs:
1435
 
                             (tcp_server.handle_request
1436
 
                              (*args[2:], **kwargs) or True))
 
907
                             tcp_server.handle_request\
 
908
                             (*args[2:], **kwargs) or True)
1437
909
        
1438
910
        logger.debug(u"Starting main loop")
1439
911
        main_loop.run()
1440
912
    except AvahiError, error:
1441
 
        logger.critical(u"AvahiError: %s", error)
 
913
        logger.critical(u"AvahiError: %s" + unicode(error))
1442
914
        sys.exit(1)
1443
915
    except KeyboardInterrupt:
1444
916
        if debug:
1445
 
            print >> sys.stderr
1446
 
        logger.debug("Server received KeyboardInterrupt")
1447
 
    logger.debug("Server exiting")
 
917
            print
1448
918
 
1449
919
if __name__ == '__main__':
1450
920
    main()