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server.py
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# This program is partly derived from an example program for an Avahi
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# service publisher, downloaded from
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# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add" and "remove" in the "AvahiService" class, the
10
 
# "server_state_changed" and "entry_group_state_changed" functions,
11
 
# and some lines in "main".
 
9
# following functions: "add_service", "remove_service",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
12
# 
13
 
# Everything else is
14
 
# Copyright © 2008 Teddy Hogeborn
15
 
# Copyright © 2008 Björn Påhlsson
 
13
# Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
 
14
# 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
25
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#     GNU General Public License for more details.
26
25
# 
27
26
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
 
27
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
30
28
# 
31
 
# Contact the authors at <mandos@fukt.bsnet.se>.
 
29
# Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
 
30
# <https://www.fukt.bsnet.se/~teddy/>.
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
 
37
import select
38
38
from optparse import OptionParser
39
39
import datetime
40
40
import errno
55
55
import stat
56
56
import logging
57
57
import logging.handlers
58
 
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
 
import ctypes.util
68
 
 
69
 
version = "1.0.2"
 
64
 
 
65
# Brief description of the operation of this program:
 
66
# 
 
67
# This server announces itself as a Zeroconf service.  Connecting
 
68
# clients use the TLS protocol, with the unusual quirk that this
 
69
# server program acts as a TLS "client" while the connecting clients
 
70
# acts as a TLS "server".  The clients (acting as a TLS "server") must
 
71
# supply an OpenPGP certificate, and the fingerprint of this
 
72
# certificate is used by this server to look up (in a list read from a
 
73
# file at start time) which binary blob to give the client.  No other
 
74
# authentication or authorization is done by this server.
 
75
 
70
76
 
71
77
logger = logging.Logger('mandos')
72
 
syslogger = (logging.handlers.SysLogHandler
73
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
 
              address = "/dev/log"))
75
 
syslogger.setFormatter(logging.Formatter
76
 
                       ('Mandos: %(levelname)s: %(message)s'))
 
78
syslogger = logging.handlers.SysLogHandler\
 
79
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
80
syslogger.setFormatter(logging.Formatter\
 
81
                        ('%(levelname)s: %(message)s'))
77
82
logger.addHandler(syslogger)
78
 
 
79
 
console = logging.StreamHandler()
80
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
81
 
                                       ' %(message)s'))
82
 
logger.addHandler(console)
83
 
 
84
 
class AvahiError(Exception):
85
 
    def __init__(self, value):
86
 
        self.value = value
87
 
        super(AvahiError, self).__init__()
88
 
    def __str__(self):
89
 
        return repr(self.value)
90
 
 
91
 
class AvahiServiceError(AvahiError):
92
 
    pass
93
 
 
94
 
class AvahiGroupError(AvahiError):
95
 
    pass
96
 
 
97
 
 
98
 
class AvahiService(object):
99
 
    """An Avahi (Zeroconf) service.
100
 
    Attributes:
101
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
102
 
               Used to optionally bind to the specified interface.
103
 
    name: string; Example: 'Mandos'
104
 
    type: string; Example: '_mandos._tcp'.
105
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
106
 
    port: integer; what port to announce
107
 
    TXT: list of strings; TXT record for the service
108
 
    domain: string; Domain to publish on, default to .local if empty.
109
 
    host: string; Host to publish records for, default is localhost
110
 
    max_renames: integer; maximum number of renames
111
 
    rename_count: integer; counter so we only rename after collisions
112
 
                  a sensible number of times
113
 
    """
114
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 servicetype = None, port = None, TXT = None,
116
 
                 domain = "", host = "", max_renames = 32768):
117
 
        self.interface = interface
118
 
        self.name = name
119
 
        self.type = servicetype
120
 
        self.port = port
121
 
        self.TXT = TXT if TXT is not None else []
122
 
        self.domain = domain
123
 
        self.host = host
124
 
        self.rename_count = 0
125
 
        self.max_renames = max_renames
126
 
    def rename(self):
127
 
        """Derived from the Avahi example code"""
128
 
        if self.rename_count >= self.max_renames:
129
 
            logger.critical(u"No suitable Zeroconf service name found"
130
 
                            u" after %i retries, exiting.",
131
 
                            self.rename_count)
132
 
            raise AvahiServiceError("Too many renames")
133
 
        self.name = server.GetAlternativeServiceName(self.name)
134
 
        logger.info(u"Changing Zeroconf service name to %r ...",
135
 
                    str(self.name))
136
 
        syslogger.setFormatter(logging.Formatter
137
 
                               ('Mandos (%s): %%(levelname)s:'
138
 
                                ' %%(message)s' % self.name))
139
 
        self.remove()
140
 
        self.add()
141
 
        self.rename_count += 1
142
 
    def remove(self):
143
 
        """Derived from the Avahi example code"""
144
 
        if group is not None:
145
 
            group.Reset()
146
 
    def add(self):
147
 
        """Derived from the Avahi example code"""
148
 
        global group
149
 
        if group is None:
150
 
            group = dbus.Interface(bus.get_object
151
 
                                   (avahi.DBUS_NAME,
152
 
                                    server.EntryGroupNew()),
153
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
 
            group.connect_to_signal('StateChanged',
155
 
                                    entry_group_state_changed)
156
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
157
 
                     service.name, service.type)
158
 
        group.AddService(
159
 
                self.interface,         # interface
160
 
                avahi.PROTO_INET6,      # protocol
161
 
                dbus.UInt32(0),         # flags
162
 
                self.name, self.type,
163
 
                self.domain, self.host,
164
 
                dbus.UInt16(self.port),
165
 
                avahi.string_array_to_txt_array(self.TXT))
166
 
        group.Commit()
167
 
 
 
83
del syslogger
 
84
 
 
85
# This variable is used to optionally bind to a specified interface.
 
86
# It is a global variable to fit in with the other variables from the
 
87
# Avahi example code.
 
88
serviceInterface = avahi.IF_UNSPEC
168
89
# From the Avahi example code:
169
 
group = None                            # our entry group
 
90
serviceName = None
 
91
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
92
servicePort = None                      # Not known at startup
 
93
serviceTXT = []                         # TXT record for the service
 
94
domain = ""                  # Domain to publish on, default to .local
 
95
host = ""          # Host to publish records for, default to localhost
 
96
group = None #our entry group
 
97
rename_count = 12       # Counter so we only rename after collisions a
 
98
                        # sensible number of times
170
99
# End of Avahi example code
171
100
 
172
101
 
173
 
class Client(dbus.service.Object):
 
102
class Client(object):
174
103
    """A representation of a client host served by this server.
175
104
    Attributes:
176
105
    name:      string; from the config file, used in log messages
177
106
    fingerprint: string (40 or 32 hexadecimal digits); used to
178
107
                 uniquely identify the client
179
108
    secret:    bytestring; sent verbatim (over TLS) to client
180
 
    host:      string; available for use by the checker command
181
 
    created:   datetime.datetime(); (UTC) object creation
182
 
    started:   datetime.datetime(); (UTC) last started
183
 
    last_checked_ok: datetime.datetime(); (UTC) or None
184
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
185
 
                                     until this client is invalid
 
109
    fqdn:      string (FQDN); available for use by the checker command
 
110
    created:   datetime.datetime()
 
111
    last_seen: datetime.datetime() or None if not yet seen
 
112
    timeout:   datetime.timedelta(); How long from last_seen until
 
113
                                     this client is invalid
186
114
    interval:  datetime.timedelta(); How often to start a new checker
187
115
    stop_hook: If set, called by stop() as stop_hook(self)
188
116
    checker:   subprocess.Popen(); a running checker process used
189
117
                                   to see if the client lives.
190
 
                                   'None' if no process is running.
 
118
                                   Is None if no process is running.
191
119
    checker_initiator_tag: a gobject event source tag, or None
192
120
    stop_initiator_tag:    - '' -
193
121
    checker_callback_tag:  - '' -
194
122
    checker_command: string; External command which is run to check if
195
 
                     client lives.  %() expansions are done at
 
123
                     client lives.  %()s expansions are done at
196
124
                     runtime with vars(self) as dict, so that for
197
125
                     instance %(name)s can be used in the command.
198
126
    Private attibutes:
199
127
    _timeout: Real variable for 'timeout'
200
128
    _interval: Real variable for 'interval'
201
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
129
    _timeout_milliseconds: Used by gobject.timeout_add()
202
130
    _interval_milliseconds: - '' -
203
131
    """
204
132
    def _set_timeout(self, timeout):
205
 
        "Setter function for the 'timeout' attribute"
 
133
        "Setter function for 'timeout' attribute"
206
134
        self._timeout = timeout
207
135
        self._timeout_milliseconds = ((self.timeout.days
208
136
                                       * 24 * 60 * 60 * 1000)
209
137
                                      + (self.timeout.seconds * 1000)
210
138
                                      + (self.timeout.microseconds
211
139
                                         // 1000))
212
 
        # Emit D-Bus signal
213
 
        self.TimeoutChanged(self._timeout_milliseconds)
214
 
    timeout = property(lambda self: self._timeout, _set_timeout)
 
140
    timeout = property(lambda self: self._timeout,
 
141
                       _set_timeout)
215
142
    del _set_timeout
216
 
    
217
143
    def _set_interval(self, interval):
218
 
        "Setter function for the 'interval' attribute"
 
144
        "Setter function for 'interval' attribute"
219
145
        self._interval = interval
220
146
        self._interval_milliseconds = ((self.interval.days
221
147
                                        * 24 * 60 * 60 * 1000)
223
149
                                          * 1000)
224
150
                                       + (self.interval.microseconds
225
151
                                          // 1000))
226
 
        # Emit D-Bus signal
227
 
        self.IntervalChanged(self._interval_milliseconds)
228
 
    interval = property(lambda self: self._interval, _set_interval)
 
152
    interval = property(lambda self: self._interval,
 
153
                        _set_interval)
229
154
    del _set_interval
230
 
    
231
 
    def __init__(self, name = None, stop_hook=None, config=None):
232
 
        """Note: the 'checker' key in 'config' sets the
233
 
        'checker_command' attribute and *not* the 'checker'
234
 
        attribute."""
235
 
        dbus.service.Object.__init__(self, bus,
236
 
                                     "/Mandos/clients/%s"
237
 
                                     % name.replace(".", "_"))
238
 
        if config is None:
239
 
            config = {}
 
155
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
156
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
157
                 interval=-1, checker=None):
 
158
        """Note: the 'checker' argument sets the 'checker_command'
 
159
        attribute and not the 'checker' attribute.."""
240
160
        self.name = name
241
161
        logger.debug(u"Creating client %r", self.name)
242
 
        # Uppercase and remove spaces from fingerprint for later
243
 
        # comparison purposes with return value from the fingerprint()
244
 
        # function
245
 
        self.fingerprint = (config["fingerprint"].upper()
246
 
                            .replace(u" ", u""))
 
162
        # Uppercase and remove spaces from fingerprint
 
163
        # for later comparison purposes with return value of
 
164
        # the fingerprint() function
 
165
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
247
166
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
248
 
        if "secret" in config:
249
 
            self.secret = config["secret"].decode(u"base64")
250
 
        elif "secfile" in config:
251
 
            with closing(open(os.path.expanduser
252
 
                              (os.path.expandvars
253
 
                               (config["secfile"])))) as secfile:
254
 
                self.secret = secfile.read()
 
167
        if secret:
 
168
            self.secret = secret.decode(u"base64")
 
169
        elif secfile:
 
170
            sf = open(secfile)
 
171
            self.secret = sf.read()
 
172
            sf.close()
255
173
        else:
256
 
            raise TypeError(u"No secret or secfile for client %s"
257
 
                            % self.name)
258
 
        self.host = config.get("host", "")
259
 
        self.created = datetime.datetime.utcnow()
260
 
        self.started = None
261
 
        self.last_checked_ok = None
262
 
        self.timeout = string_to_delta(config["timeout"])
263
 
        self.interval = string_to_delta(config["interval"])
 
174
            raise RuntimeError(u"No secret or secfile for client %s"
 
175
                               % self.name)
 
176
        self.fqdn = fqdn                # string
 
177
        self.created = datetime.datetime.now()
 
178
        self.last_seen = None
 
179
        self.timeout = string_to_delta(timeout)
 
180
        self.interval = string_to_delta(interval)
264
181
        self.stop_hook = stop_hook
265
182
        self.checker = None
266
183
        self.checker_initiator_tag = None
267
184
        self.stop_initiator_tag = None
268
185
        self.checker_callback_tag = None
269
 
        self.check_command = config["checker"]
270
 
    
 
186
        self.check_command = checker
271
187
    def start(self):
272
188
        """Start this client's checker and timeout hooks"""
273
 
        self.started = datetime.datetime.utcnow()
274
189
        # Schedule a new checker to be started an 'interval' from now,
275
190
        # and every interval from then on.
276
 
        self.checker_initiator_tag = (gobject.timeout_add
277
 
                                      (self._interval_milliseconds,
278
 
                                       self.start_checker))
 
191
        self.checker_initiator_tag = gobject.timeout_add\
 
192
                                     (self._interval_milliseconds,
 
193
                                      self.start_checker)
279
194
        # Also start a new checker *right now*.
280
195
        self.start_checker()
281
196
        # Schedule a stop() when 'timeout' has passed
282
 
        self.stop_initiator_tag = (gobject.timeout_add
283
 
                                   (self._timeout_milliseconds,
284
 
                                    self.stop))
285
 
        # Emit D-Bus signal
286
 
        self.StateChanged(True)
287
 
    
 
197
        self.stop_initiator_tag = gobject.timeout_add\
 
198
                                  (self._timeout_milliseconds,
 
199
                                   self.stop)
288
200
    def stop(self):
289
 
        """Stop this client."""
290
 
        if getattr(self, "started", None) is not None:
291
 
            logger.info(u"Stopping client %s", self.name)
 
201
        """Stop this client.
 
202
        The possibility that this client might be restarted is left
 
203
        open, but not currently used."""
 
204
        # If this client doesn't have a secret, it is already stopped.
 
205
        if self.secret:
 
206
            logger.debug(u"Stopping client %s", self.name)
 
207
            self.secret = None
292
208
        else:
293
209
            return False
294
 
        if getattr(self, "stop_initiator_tag", False):
 
210
        if hasattr(self, "stop_initiator_tag") \
 
211
               and self.stop_initiator_tag:
295
212
            gobject.source_remove(self.stop_initiator_tag)
296
213
            self.stop_initiator_tag = None
297
 
        if getattr(self, "checker_initiator_tag", False):
 
214
        if hasattr(self, "checker_initiator_tag") \
 
215
               and self.checker_initiator_tag:
298
216
            gobject.source_remove(self.checker_initiator_tag)
299
217
            self.checker_initiator_tag = None
300
218
        self.stop_checker()
301
219
        if self.stop_hook:
302
220
            self.stop_hook(self)
303
 
        self.started = None
304
 
        # Emit D-Bus signal
305
 
        self.StateChanged(False)
306
221
        # Do not run this again if called by a gobject.timeout_add
307
222
        return False
308
 
    
309
223
    def __del__(self):
310
224
        self.stop_hook = None
311
225
        self.stop()
312
 
    
313
226
    def checker_callback(self, pid, condition):
314
227
        """The checker has completed, so take appropriate actions."""
 
228
        now = datetime.datetime.now()
315
229
        self.checker_callback_tag = None
316
230
        self.checker = None
317
 
        if (os.WIFEXITED(condition) 
318
 
            and (os.WEXITSTATUS(condition) == 0)):
319
 
            logger.info(u"Checker for %(name)s succeeded",
320
 
                        vars(self))
321
 
            # Emit D-Bus signal
322
 
            self.CheckerCompleted(True)
323
 
            self.bump_timeout()
 
231
        if os.WIFEXITED(condition) \
 
232
               and (os.WEXITSTATUS(condition) == 0):
 
233
            logger.debug(u"Checker for %(name)s succeeded",
 
234
                         vars(self))
 
235
            self.last_seen = now
 
236
            gobject.source_remove(self.stop_initiator_tag)
 
237
            self.stop_initiator_tag = gobject.timeout_add\
 
238
                                      (self._timeout_milliseconds,
 
239
                                       self.stop)
324
240
        elif not os.WIFEXITED(condition):
325
241
            logger.warning(u"Checker for %(name)s crashed?",
326
242
                           vars(self))
327
 
            # Emit D-Bus signal
328
 
            self.CheckerCompleted(False)
329
243
        else:
330
 
            logger.info(u"Checker for %(name)s failed",
331
 
                        vars(self))
332
 
            # Emit D-Bus signal
333
 
            self.CheckerCompleted(False)
334
 
    
335
 
    def bump_timeout(self):
336
 
        """Bump up the timeout for this client.
337
 
        This should only be called when the client has been seen,
338
 
        alive and well.
339
 
        """
340
 
        self.last_checked_ok = datetime.datetime.utcnow()
341
 
        gobject.source_remove(self.stop_initiator_tag)
342
 
        self.stop_initiator_tag = (gobject.timeout_add
343
 
                                   (self._timeout_milliseconds,
344
 
                                    self.stop))
345
 
    
 
244
            logger.debug(u"Checker for %(name)s failed",
 
245
                         vars(self))
346
246
    def start_checker(self):
347
247
        """Start a new checker subprocess if one is not running.
348
248
        If a checker already exists, leave it running and do
357
257
        # is as it should be.
358
258
        if self.checker is None:
359
259
            try:
360
 
                # In case check_command has exactly one % operator
361
 
                command = self.check_command % self.host
 
260
                command = self.check_command % self.fqdn
362
261
            except TypeError:
363
 
                # Escape attributes for the shell
364
262
                escaped_attrs = dict((key, re.escape(str(val)))
365
263
                                     for key, val in
366
264
                                     vars(self).iteritems())
367
265
                try:
368
266
                    command = self.check_command % escaped_attrs
369
267
                except TypeError, error:
370
 
                    logger.error(u'Could not format string "%s":'
371
 
                                 u' %s', self.check_command, error)
 
268
                    logger.critical(u'Could not format string "%s":'
 
269
                                    u' %s', self.check_command, error)
372
270
                    return True # Try again later
373
271
            try:
374
 
                logger.info(u"Starting checker %r for %s",
375
 
                            command, self.name)
376
 
                # We don't need to redirect stdout and stderr, since
377
 
                # in normal mode, that is already done by daemon(),
378
 
                # and in debug mode we don't want to.  (Stdin is
379
 
                # always replaced by /dev/null.)
380
 
                self.checker = subprocess.Popen(command,
381
 
                                                close_fds=True,
382
 
                                                shell=True, cwd="/")
383
 
                self.checker_callback_tag = (gobject.child_watch_add
384
 
                                             (self.checker.pid,
385
 
                                              self.checker_callback))
386
 
                # Emit D-Bus signal
387
 
                self.CheckerStarted(command)
388
 
            except OSError, error:
 
272
                logger.debug(u"Starting checker %r for %s",
 
273
                             command, self.name)
 
274
                self.checker = subprocess.\
 
275
                               Popen(command,
 
276
                                     close_fds=True, shell=True,
 
277
                                     cwd="/")
 
278
                self.checker_callback_tag = gobject.child_watch_add\
 
279
                                            (self.checker.pid,
 
280
                                             self.checker_callback)
 
281
            except subprocess.OSError, error:
389
282
                logger.error(u"Failed to start subprocess: %s",
390
283
                             error)
391
284
        # Re-run this periodically if run by gobject.timeout_add
392
285
        return True
393
 
    
394
286
    def stop_checker(self):
395
287
        """Force the checker process, if any, to stop."""
396
288
        if self.checker_callback_tag:
397
289
            gobject.source_remove(self.checker_callback_tag)
398
290
            self.checker_callback_tag = None
399
 
        if getattr(self, "checker", None) is None:
 
291
        if not hasattr(self, "checker") or self.checker is None:
400
292
            return
401
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
293
        logger.debug("Stopping checker for %(name)s", vars(self))
402
294
        try:
403
295
            os.kill(self.checker.pid, signal.SIGTERM)
404
296
            #os.sleep(0.5)
405
297
            #if self.checker.poll() is None:
406
298
            #    os.kill(self.checker.pid, signal.SIGKILL)
407
299
        except OSError, error:
408
 
            if error.errno != errno.ESRCH: # No such process
 
300
            if error.errno != errno.ESRCH:
409
301
                raise
410
302
        self.checker = None
411
 
    
412
 
    def still_valid(self):
 
303
    def still_valid(self, now=None):
413
304
        """Has the timeout not yet passed for this client?"""
414
 
        if not self.started:
415
 
            return False
416
 
        now = datetime.datetime.utcnow()
417
 
        if self.last_checked_ok is None:
 
305
        if now is None:
 
306
            now = datetime.datetime.now()
 
307
        if self.last_seen is None:
418
308
            return now < (self.created + self.timeout)
419
309
        else:
420
 
            return now < (self.last_checked_ok + self.timeout)
421
 
    
422
 
    ## D-Bus methods & signals
423
 
    _interface = u"org.mandos_system.Mandos.Client"
424
 
    
425
 
    def _datetime_to_dbus_struct(dt):
426
 
        return dbus.Struct(dt.year, dt.month, dt.day, dt.hour,
427
 
                           dt.minute, dt.second, dt.microsecond,
428
 
                           signature="nyyyyyu")
429
 
    
430
 
    # BumpTimeout - method
431
 
    BumpTimeout = dbus.service.method(_interface)(bump_timeout)
432
 
    BumpTimeout.__name__ = "BumpTimeout"
433
 
    
434
 
    # IntervalChanged - signal
435
 
    @dbus.service.signal(_interface, signature="t")
436
 
    def IntervalChanged(self, t):
437
 
        "D-Bus signal"
438
 
        pass
439
 
    
440
 
    # CheckerCompleted - signal
441
 
    @dbus.service.signal(_interface, signature="b")
442
 
    def CheckerCompleted(self, success):
443
 
        "D-Bus signal"
444
 
        pass
445
 
    
446
 
    # CheckerIsRunning - method
447
 
    @dbus.service.method(_interface, out_signature="b")
448
 
    def CheckerIsRunning(self):
449
 
        "D-Bus getter method"
450
 
        return self.checker is not None
451
 
    
452
 
    # CheckerStarted - signal
453
 
    @dbus.service.signal(_interface, signature="s")
454
 
    def CheckerStarted(self, command):
455
 
        "D-Bus signal"
456
 
        pass
457
 
    
458
 
    # GetChecker - method
459
 
    @dbus.service.method(_interface, out_signature="s")
460
 
    def GetChecker(self):
461
 
        "D-Bus getter method"
462
 
        return self.checker_command
463
 
    
464
 
    # GetCreated - method
465
 
    @dbus.service.method(_interface, out_signature="(nyyyyyu)")
466
 
    def GetCreated(self):
467
 
        "D-Bus getter method"
468
 
        return datetime_to_dbus_struct(self.created)
469
 
    
470
 
    # GetFingerprint - method
471
 
    @dbus.service.method(_interface, out_signature="s")
472
 
    def GetFingerprint(self):
473
 
        "D-Bus getter method"
474
 
        return self.fingerprint
475
 
    
476
 
    # GetHost - method
477
 
    @dbus.service.method(_interface, out_signature="s")
478
 
    def GetHost(self):
479
 
        "D-Bus getter method"
480
 
        return self.host
481
 
    
482
 
    # GetInterval - method
483
 
    @dbus.service.method(_interface, out_signature="t")
484
 
    def GetInterval(self):
485
 
        "D-Bus getter method"
486
 
        return self._interval_milliseconds
487
 
    
488
 
    # GetName - method
489
 
    @dbus.service.method(_interface, out_signature="s")
490
 
    def GetName(self):
491
 
        "D-Bus getter method"
492
 
        return self.name
493
 
    
494
 
    # GetStarted - method
495
 
    @dbus.service.method(_interface, out_signature="(nyyyyyu)")
496
 
    def GetStarted(self):
497
 
        "D-Bus getter method"
498
 
        if self.started is not None:
499
 
            return datetime_to_dbus_struct(self.started)
500
 
        else:
501
 
            return dbus.Struct(0, 0, 0, 0, 0, 0, 0,
502
 
                               signature="nyyyyyu")
503
 
    
504
 
    # GetTimeout - method
505
 
    @dbus.service.method(_interface, out_signature="t")
506
 
    def GetTimeout(self):
507
 
        "D-Bus getter method"
508
 
        return self._timeout_milliseconds
509
 
    
510
 
    # SetChecker - method
511
 
    @dbus.service.method(_interface, in_signature="s")
512
 
    def SetChecker(self, checker):
513
 
        "D-Bus setter method"
514
 
        self.checker_command = checker
515
 
    
516
 
    # SetHost - method
517
 
    @dbus.service.method(_interface, in_signature="s")
518
 
    def SetHost(self, host):
519
 
        "D-Bus setter method"
520
 
        self.host = host
521
 
    
522
 
    # SetInterval - method
523
 
    @dbus.service.method(_interface, in_signature="t")
524
 
    def SetInterval(self, milliseconds):
525
 
        self.interval = datetime.timdeelta(0, 0, 0, milliseconds)
526
 
    
527
 
    # SetTimeout - method
528
 
    @dbus.service.method(_interface, in_signature="t")
529
 
    def SetTimeout(self, milliseconds):
530
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
531
 
    
532
 
    # SetSecret - method
533
 
    @dbus.service.method(_interface, in_signature="ay",
534
 
                         byte_arrays=True)
535
 
    def SetSecret(self, secret):
536
 
        "D-Bus setter method"
537
 
        self.secret = str(secret)
538
 
    
539
 
    # Start - method
540
 
    Start = dbus.service.method(_interface)(start)
541
 
    Start.__name__ = "Start"
542
 
    
543
 
    # StartChecker - method
544
 
    StartChecker = dbus.service.method(_interface)(start_checker)
545
 
    StartChecker.__name__ = "StartChecker"
546
 
    
547
 
    # StateChanged - signal
548
 
    @dbus.service.signal(_interface, signature="b")
549
 
    def StateChanged(self, started):
550
 
        "D-Bus signal"
551
 
        pass
552
 
    
553
 
    # StillValid - method
554
 
    StillValid = (dbus.service.method(_interface, out_signature="b")
555
 
                  (still_valid))
556
 
    StillValid.__name__ = "StillValid"
557
 
    
558
 
    # Stop - method
559
 
    Stop = dbus.service.method(_interface)(stop)
560
 
    Stop.__name__ = "Stop"
561
 
    
562
 
    # StopChecker - method
563
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
564
 
    StopChecker.__name__ = "StopChecker"
565
 
    
566
 
    # TimeoutChanged - signal
567
 
    @dbus.service.signal(_interface, signature="t")
568
 
    def TimeoutChanged(self, t):
569
 
        "D-Bus signal"
570
 
        pass
571
 
    
572
 
    del _datetime_to_dbus_struct
573
 
    del _interface
 
310
            return now < (self.last_seen + self.timeout)
574
311
 
575
312
 
576
313
def peer_certificate(session):
577
314
    "Return the peer's OpenPGP certificate as a bytestring"
578
315
    # If not an OpenPGP certificate...
579
 
    if (gnutls.library.functions
580
 
        .gnutls_certificate_type_get(session._c_object)
581
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
316
    if gnutls.library.functions.gnutls_certificate_type_get\
 
317
            (session._c_object) \
 
318
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
582
319
        # ...do the normal thing
583
320
        return session.peer_certificate
584
321
    list_size = ctypes.c_uint()
585
 
    cert_list = (gnutls.library.functions
586
 
                 .gnutls_certificate_get_peers
587
 
                 (session._c_object, ctypes.byref(list_size)))
 
322
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
323
        (session._c_object, ctypes.byref(list_size))
588
324
    if list_size.value == 0:
589
325
        return None
590
326
    cert = cert_list[0]
593
329
 
594
330
def fingerprint(openpgp):
595
331
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
596
 
    # New GnuTLS "datum" with the OpenPGP public key
597
 
    datum = (gnutls.library.types
598
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
599
 
                                         ctypes.POINTER
600
 
                                         (ctypes.c_ubyte)),
601
 
                             ctypes.c_uint(len(openpgp))))
602
332
    # New empty GnuTLS certificate
603
333
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
604
 
    (gnutls.library.functions
605
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
334
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
335
        (ctypes.byref(crt))
 
336
    # New GnuTLS "datum" with the OpenPGP public key
 
337
    datum = gnutls.library.types.gnutls_datum_t\
 
338
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
339
                     ctypes.POINTER(ctypes.c_ubyte)),
 
340
         ctypes.c_uint(len(openpgp)))
606
341
    # Import the OpenPGP public key into the certificate
607
 
    (gnutls.library.functions
608
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
609
 
                                gnutls.library.constants
610
 
                                .GNUTLS_OPENPGP_FMT_RAW))
611
 
    # Verify the self signature in the key
612
 
    crtverify = ctypes.c_uint()
613
 
    (gnutls.library.functions
614
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
615
 
    if crtverify.value != 0:
616
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
617
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
342
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
343
        (crt,
 
344
         ctypes.byref(datum),
 
345
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
618
346
    # New buffer for the fingerprint
619
 
    buf = ctypes.create_string_buffer(20)
620
 
    buf_len = ctypes.c_size_t()
 
347
    buffer = ctypes.create_string_buffer(20)
 
348
    buffer_length = ctypes.c_size_t()
621
349
    # Get the fingerprint from the certificate into the buffer
622
 
    (gnutls.library.functions
623
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
624
 
                                         ctypes.byref(buf_len)))
 
350
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
351
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
625
352
    # Deinit the certificate
626
353
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
627
354
    # Convert the buffer to a Python bytestring
628
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
355
    fpr = ctypes.string_at(buffer, buffer_length.value)
629
356
    # Convert the bytestring to hexadecimal notation
630
357
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
631
358
    return hex_fpr
632
359
 
633
360
 
634
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
361
class tcp_handler(SocketServer.BaseRequestHandler, object):
635
362
    """A TCP request handler class.
636
363
    Instantiated by IPv6_TCPServer for each request to handle it.
637
364
    Note: This will run in its own forked process."""
638
365
    
639
366
    def handle(self):
640
 
        logger.info(u"TCP connection from: %s",
641
 
                    unicode(self.client_address))
642
 
        session = (gnutls.connection
643
 
                   .ClientSession(self.request,
644
 
                                  gnutls.connection
645
 
                                  .X509Credentials()))
646
 
        
647
 
        line = self.request.makefile().readline()
648
 
        logger.debug(u"Protocol version: %r", line)
649
 
        try:
650
 
            if int(line.strip().split()[0]) > 1:
651
 
                raise RuntimeError
652
 
        except (ValueError, IndexError, RuntimeError), error:
653
 
            logger.error(u"Unknown protocol version: %s", error)
654
 
            return
655
 
        
656
 
        # Note: gnutls.connection.X509Credentials is really a generic
657
 
        # GnuTLS certificate credentials object so long as no X.509
658
 
        # keys are added to it.  Therefore, we can use it here despite
659
 
        # using OpenPGP certificates.
 
367
        logger.debug(u"TCP connection from: %s",
 
368
                     unicode(self.client_address))
 
369
        session = gnutls.connection.ClientSession(self.request,
 
370
                                                  gnutls.connection.\
 
371
                                                  X509Credentials())
660
372
        
661
373
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
662
374
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
663
375
        #                "+DHE-DSS"))
664
 
        # Use a fallback default, since this MUST be set.
665
 
        priority = self.server.settings.get("priority", "NORMAL")
666
 
        (gnutls.library.functions
667
 
         .gnutls_priority_set_direct(session._c_object,
668
 
                                     priority, None))
 
376
        priority = "NORMAL"
 
377
        if self.server.options.priority:
 
378
            priority = self.server.options.priority
 
379
        gnutls.library.functions.gnutls_priority_set_direct\
 
380
            (session._c_object, priority, None);
669
381
        
670
382
        try:
671
383
            session.handshake()
672
384
        except gnutls.errors.GNUTLSError, error:
673
 
            logger.warning(u"Handshake failed: %s", error)
 
385
            logger.debug(u"Handshake failed: %s", error)
674
386
            # Do not run session.bye() here: the session is not
675
387
            # established.  Just abandon the request.
676
388
            return
677
389
        try:
678
390
            fpr = fingerprint(peer_certificate(session))
679
391
        except (TypeError, gnutls.errors.GNUTLSError), error:
680
 
            logger.warning(u"Bad certificate: %s", error)
 
392
            logger.debug(u"Bad certificate: %s", error)
681
393
            session.bye()
682
394
            return
683
395
        logger.debug(u"Fingerprint: %s", fpr)
 
396
        client = None
684
397
        for c in self.server.clients:
685
398
            if c.fingerprint == fpr:
686
399
                client = c
687
400
                break
688
 
        else:
689
 
            logger.warning(u"Client not found for fingerprint: %s",
690
 
                           fpr)
691
 
            session.bye()
692
 
            return
693
401
        # Have to check if client.still_valid(), since it is possible
694
402
        # that the client timed out while establishing the GnuTLS
695
403
        # session.
696
 
        if not client.still_valid():
697
 
            logger.warning(u"Client %(name)s is invalid",
698
 
                           vars(client))
 
404
        if (not client) or (not client.still_valid()):
 
405
            if client:
 
406
                logger.debug(u"Client %(name)s is invalid",
 
407
                             vars(client))
 
408
            else:
 
409
                logger.debug(u"Client not found for fingerprint: %s",
 
410
                             fpr)
699
411
            session.bye()
700
412
            return
701
 
        ## This won't work here, since we're in a fork.
702
 
        # client.bump_timeout()
703
413
        sent_size = 0
704
414
        while sent_size < len(client.secret):
705
415
            sent = session.send(client.secret[sent_size:])
710
420
        session.bye()
711
421
 
712
422
 
713
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
714
 
                     SocketServer.TCPServer, object):
 
423
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
715
424
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
716
425
    Attributes:
717
 
        settings:       Server settings
 
426
        options:        Command line options
718
427
        clients:        Set() of Client objects
719
 
        enabled:        Boolean; whether this server is activated yet
720
428
    """
721
429
    address_family = socket.AF_INET6
722
430
    def __init__(self, *args, **kwargs):
723
 
        if "settings" in kwargs:
724
 
            self.settings = kwargs["settings"]
725
 
            del kwargs["settings"]
 
431
        if "options" in kwargs:
 
432
            self.options = kwargs["options"]
 
433
            del kwargs["options"]
726
434
        if "clients" in kwargs:
727
435
            self.clients = kwargs["clients"]
728
436
            del kwargs["clients"]
729
 
        self.enabled = False
730
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
437
        return super(type(self), self).__init__(*args, **kwargs)
731
438
    def server_bind(self):
732
439
        """This overrides the normal server_bind() function
733
440
        to bind to an interface if one was specified, and also NOT to
734
441
        bind to an address or port if they were not specified."""
735
 
        if self.settings["interface"]:
736
 
            # 25 is from /usr/include/asm-i486/socket.h
737
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
 
442
        if self.options.interface:
 
443
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
444
                # From /usr/include/asm-i486/socket.h
 
445
                socket.SO_BINDTODEVICE = 25
738
446
            try:
739
447
                self.socket.setsockopt(socket.SOL_SOCKET,
740
 
                                       SO_BINDTODEVICE,
741
 
                                       self.settings["interface"])
 
448
                                       socket.SO_BINDTODEVICE,
 
449
                                       self.options.interface)
742
450
            except socket.error, error:
743
451
                if error[0] == errno.EPERM:
744
 
                    logger.error(u"No permission to"
745
 
                                 u" bind to interface %s",
746
 
                                 self.settings["interface"])
 
452
                    logger.warning(u"No permission to"
 
453
                                   u" bind to interface %s",
 
454
                                   self.options.interface)
747
455
                else:
748
456
                    raise error
749
457
        # Only bind(2) the socket if we really need to.
752
460
                in6addr_any = "::"
753
461
                self.server_address = (in6addr_any,
754
462
                                       self.server_address[1])
755
 
            elif not self.server_address[1]:
 
463
            elif self.server_address[1] is None:
756
464
                self.server_address = (self.server_address[0],
757
465
                                       0)
758
 
#                 if self.settings["interface"]:
759
 
#                     self.server_address = (self.server_address[0],
760
 
#                                            0, # port
761
 
#                                            0, # flowinfo
762
 
#                                            if_nametoindex
763
 
#                                            (self.settings
764
 
#                                             ["interface"]))
765
 
            return super(IPv6_TCPServer, self).server_bind()
766
 
    def server_activate(self):
767
 
        if self.enabled:
768
 
            return super(IPv6_TCPServer, self).server_activate()
769
 
    def enable(self):
770
 
        self.enabled = True
 
466
            return super(type(self), self).server_bind()
771
467
 
772
468
 
773
469
def string_to_delta(interval):
783
479
    datetime.timedelta(1)
784
480
    >>> string_to_delta(u'1w')
785
481
    datetime.timedelta(7)
786
 
    >>> string_to_delta('5m 30s')
787
 
    datetime.timedelta(0, 330)
788
482
    """
789
 
    timevalue = datetime.timedelta(0)
790
 
    for s in interval.split():
791
 
        try:
792
 
            suffix = unicode(s[-1])
793
 
            value = int(s[:-1])
794
 
            if suffix == u"d":
795
 
                delta = datetime.timedelta(value)
796
 
            elif suffix == u"s":
797
 
                delta = datetime.timedelta(0, value)
798
 
            elif suffix == u"m":
799
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
800
 
            elif suffix == u"h":
801
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
802
 
            elif suffix == u"w":
803
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
804
 
            else:
805
 
                raise ValueError
806
 
        except (ValueError, IndexError):
 
483
    try:
 
484
        suffix=unicode(interval[-1])
 
485
        value=int(interval[:-1])
 
486
        if suffix == u"d":
 
487
            delta = datetime.timedelta(value)
 
488
        elif suffix == u"s":
 
489
            delta = datetime.timedelta(0, value)
 
490
        elif suffix == u"m":
 
491
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
492
        elif suffix == u"h":
 
493
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
494
        elif suffix == u"w":
 
495
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
496
        else:
807
497
            raise ValueError
808
 
        timevalue += delta
809
 
    return timevalue
 
498
    except (ValueError, IndexError):
 
499
        raise ValueError
 
500
    return delta
 
501
 
 
502
 
 
503
def add_service():
 
504
    """Derived from the Avahi example code"""
 
505
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
506
           domain, host
 
507
    if group is None:
 
508
        group = dbus.Interface(
 
509
                bus.get_object( avahi.DBUS_NAME,
 
510
                                server.EntryGroupNew()),
 
511
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
512
        group.connect_to_signal('StateChanged',
 
513
                                entry_group_state_changed)
 
514
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
515
                 serviceName, serviceType)
 
516
    
 
517
    group.AddService(
 
518
            serviceInterface,           # interface
 
519
            avahi.PROTO_INET6,          # protocol
 
520
            dbus.UInt32(0),             # flags
 
521
            serviceName, serviceType,
 
522
            domain, host,
 
523
            dbus.UInt16(servicePort),
 
524
            avahi.string_array_to_txt_array(serviceTXT))
 
525
    group.Commit()
 
526
 
 
527
 
 
528
def remove_service():
 
529
    """From the Avahi example code"""
 
530
    global group
 
531
    
 
532
    if not group is None:
 
533
        group.Reset()
810
534
 
811
535
 
812
536
def server_state_changed(state):
813
537
    """Derived from the Avahi example code"""
814
538
    if state == avahi.SERVER_COLLISION:
815
 
        logger.error(u"Zeroconf server name collision")
816
 
        service.remove()
 
539
        logger.warning(u"Server name collision")
 
540
        remove_service()
817
541
    elif state == avahi.SERVER_RUNNING:
818
 
        service.add()
 
542
        add_service()
819
543
 
820
544
 
821
545
def entry_group_state_changed(state, error):
822
546
    """Derived from the Avahi example code"""
823
 
    logger.debug(u"Avahi state change: %i", state)
 
547
    global serviceName, server, rename_count
 
548
    
 
549
    logger.debug(u"state change: %i", state)
824
550
    
825
551
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
826
 
        logger.debug(u"Zeroconf service established.")
 
552
        logger.debug(u"Service established.")
827
553
    elif state == avahi.ENTRY_GROUP_COLLISION:
828
 
        logger.warning(u"Zeroconf service name collision.")
829
 
        service.rename()
 
554
        
 
555
        rename_count = rename_count - 1
 
556
        if rename_count > 0:
 
557
            name = server.GetAlternativeServiceName(name)
 
558
            logger.warning(u"Service name collision, "
 
559
                           u"changing name to '%s' ...", name)
 
560
            remove_service()
 
561
            add_service()
 
562
            
 
563
        else:
 
564
            logger.error(u"No suitable service name found after %i"
 
565
                         u" retries, exiting.", n_rename)
 
566
            killme(1)
830
567
    elif state == avahi.ENTRY_GROUP_FAILURE:
831
 
        logger.critical(u"Avahi: Error in group state changed %s",
832
 
                        unicode(error))
833
 
        raise AvahiGroupError("State changed: %s", str(error))
 
568
        logger.error(u"Error in group state changed %s",
 
569
                     unicode(error))
 
570
        killme(1)
 
571
 
834
572
 
835
573
def if_nametoindex(interface):
836
 
    """Call the C function if_nametoindex(), or equivalent"""
837
 
    global if_nametoindex
 
574
    """Call the C function if_nametoindex()"""
838
575
    try:
839
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
840
 
                          (ctypes.util.find_library("c"))
841
 
                          .if_nametoindex)
 
576
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
577
        return libc.if_nametoindex(interface)
842
578
    except (OSError, AttributeError):
843
579
        if "struct" not in sys.modules:
844
580
            import struct
845
581
        if "fcntl" not in sys.modules:
846
582
            import fcntl
847
 
        def if_nametoindex(interface):
848
 
            "Get an interface index the hard way, i.e. using fcntl()"
849
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
850
 
            with closing(socket.socket()) as s:
851
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
852
 
                                    struct.pack("16s16x", interface))
853
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
854
 
            return interface_index
855
 
    return if_nametoindex(interface)
856
 
 
857
 
 
858
 
def daemon(nochdir = False, noclose = False):
 
583
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
584
        s = socket.socket()
 
585
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
586
                            struct.pack("16s16x", interface))
 
587
        s.close()
 
588
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
589
        return interface_index
 
590
 
 
591
 
 
592
def daemon(nochdir, noclose):
859
593
    """See daemon(3).  Standard BSD Unix function.
860
594
    This should really exist as os.daemon, but it doesn't (yet)."""
861
595
    if os.fork():
863
597
    os.setsid()
864
598
    if not nochdir:
865
599
        os.chdir("/")
866
 
    if os.fork():
867
 
        sys.exit()
868
600
    if not noclose:
869
601
        # Close all standard open file descriptors
870
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
602
        null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
871
603
        if not stat.S_ISCHR(os.fstat(null).st_mode):
872
604
            raise OSError(errno.ENODEV,
873
605
                          "/dev/null not a character device")
878
610
            os.close(null)
879
611
 
880
612
 
 
613
def killme(status = 0):
 
614
    logger.debug("Stopping server with exit status %d", status)
 
615
    exitstatus = status
 
616
    if main_loop_started:
 
617
        main_loop.quit()
 
618
    else:
 
619
        sys.exit(status)
 
620
 
 
621
 
881
622
def main():
882
 
    parser = OptionParser(version = "%%prog %s" % version)
 
623
    global exitstatus
 
624
    exitstatus = 0
 
625
    global main_loop_started
 
626
    main_loop_started = False
 
627
    
 
628
    parser = OptionParser()
883
629
    parser.add_option("-i", "--interface", type="string",
884
 
                      metavar="IF", help="Bind to interface IF")
885
 
    parser.add_option("-a", "--address", type="string",
 
630
                      default=None, metavar="IF",
 
631
                      help="Bind to interface IF")
 
632
    parser.add_option("-a", "--address", type="string", default=None,
886
633
                      help="Address to listen for requests on")
887
 
    parser.add_option("-p", "--port", type="int",
 
634
    parser.add_option("-p", "--port", type="int", default=None,
888
635
                      help="Port number to receive requests on")
889
636
    parser.add_option("--check", action="store_true", default=False,
890
637
                      help="Run self-test")
891
 
    parser.add_option("--debug", action="store_true",
892
 
                      help="Debug mode; run in foreground and log to"
893
 
                      " terminal")
894
 
    parser.add_option("--priority", type="string", help="GnuTLS"
895
 
                      " priority string (see GnuTLS documentation)")
896
 
    parser.add_option("--servicename", type="string", metavar="NAME",
897
 
                      help="Zeroconf service name")
898
 
    parser.add_option("--configdir", type="string",
899
 
                      default="/etc/mandos", metavar="DIR",
900
 
                      help="Directory to search for configuration"
901
 
                      " files")
902
 
    options = parser.parse_args()[0]
 
638
    parser.add_option("--debug", action="store_true", default=False,
 
639
                      help="Debug mode")
 
640
    parser.add_option("--priority", type="string",
 
641
                      default="SECURE256",
 
642
                      help="GnuTLS priority string"
 
643
                      " (see GnuTLS documentation)")
 
644
    parser.add_option("--servicename", type="string",
 
645
                      default="Mandos", help="Zeroconf service name")
 
646
    (options, args) = parser.parse_args()
903
647
    
904
648
    if options.check:
905
649
        import doctest
906
650
        doctest.testmod()
907
651
        sys.exit()
908
652
    
909
 
    # Default values for config file for server-global settings
910
 
    server_defaults = { "interface": "",
911
 
                        "address": "",
912
 
                        "port": "",
913
 
                        "debug": "False",
914
 
                        "priority":
915
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
916
 
                        "servicename": "Mandos",
917
 
                        }
918
 
    
919
 
    # Parse config file for server-global settings
920
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
921
 
    del server_defaults
922
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
923
 
    # Convert the SafeConfigParser object to a dict
924
 
    server_settings = server_config.defaults()
925
 
    # Use getboolean on the boolean config option
926
 
    server_settings["debug"] = (server_config.getboolean
927
 
                                ("DEFAULT", "debug"))
928
 
    del server_config
929
 
    
930
 
    # Override the settings from the config file with command line
931
 
    # options, if set.
932
 
    for option in ("interface", "address", "port", "debug",
933
 
                   "priority", "servicename", "configdir"):
934
 
        value = getattr(options, option)
935
 
        if value is not None:
936
 
            server_settings[option] = value
937
 
    del options
938
 
    # Now we have our good server settings in "server_settings"
939
 
    
940
 
    debug = server_settings["debug"]
941
 
    
942
 
    if not debug:
943
 
        syslogger.setLevel(logging.WARNING)
944
 
        console.setLevel(logging.WARNING)
945
 
    
946
 
    if server_settings["servicename"] != "Mandos":
947
 
        syslogger.setFormatter(logging.Formatter
948
 
                               ('Mandos (%s): %%(levelname)s:'
949
 
                                ' %%(message)s'
950
 
                                % server_settings["servicename"]))
951
 
    
952
 
    # Parse config file with clients
953
 
    client_defaults = { "timeout": "1h",
954
 
                        "interval": "5m",
955
 
                        "checker": "fping -q -- %(host)s",
956
 
                        "host": "",
957
 
                        }
958
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
959
 
    client_config.read(os.path.join(server_settings["configdir"],
960
 
                                    "clients.conf"))
961
 
    
962
 
    clients = Set()
963
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
964
 
                                 server_settings["port"]),
965
 
                                TCP_handler,
966
 
                                settings=server_settings,
967
 
                                clients=clients)
968
 
    pidfilename = "/var/run/mandos.pid"
969
 
    try:
970
 
        pidfile = open(pidfilename, "w")
971
 
    except IOError, error:
972
 
        logger.error("Could not open file %r", pidfilename)
973
 
    
974
 
    uid = 65534
975
 
    gid = 65534
976
 
    try:
977
 
        uid = pwd.getpwnam("mandos").pw_uid
978
 
    except KeyError:
979
 
        try:
980
 
            uid = pwd.getpwnam("nobody").pw_uid
981
 
        except KeyError:
982
 
            pass
983
 
    try:
984
 
        gid = pwd.getpwnam("mandos").pw_gid
985
 
    except KeyError:
986
 
        try:
987
 
            gid = pwd.getpwnam("nogroup").pw_gid
988
 
        except KeyError:
989
 
            pass
990
 
    try:
991
 
        os.setuid(uid)
992
 
        os.setgid(gid)
993
 
    except OSError, error:
994
 
        if error[0] != errno.EPERM:
995
 
            raise error
996
 
    
997
 
    global service
998
 
    service = AvahiService(name = server_settings["servicename"],
999
 
                           servicetype = "_mandos._tcp", )
1000
 
    if server_settings["interface"]:
1001
 
        service.interface = (if_nametoindex
1002
 
                             (server_settings["interface"]))
 
653
    # Parse config file
 
654
    defaults = { "timeout": "1h",
 
655
                 "interval": "5m",
 
656
                 "checker": "fping -q -- %%(fqdn)s",
 
657
                 }
 
658
    client_config = ConfigParser.SafeConfigParser(defaults)
 
659
    #client_config.readfp(open("global.conf"), "global.conf")
 
660
    client_config.read("mandos-clients.conf")
 
661
    
 
662
    global serviceName
 
663
    serviceName = options.servicename;
1003
664
    
1004
665
    global main_loop
1005
666
    global bus
1008
669
    DBusGMainLoop(set_as_default=True )
1009
670
    main_loop = gobject.MainLoop()
1010
671
    bus = dbus.SystemBus()
1011
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1012
 
                                           avahi.DBUS_PATH_SERVER),
1013
 
                            avahi.DBUS_INTERFACE_SERVER)
 
672
    server = dbus.Interface(
 
673
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
674
            avahi.DBUS_INTERFACE_SERVER )
1014
675
    # End of Avahi example code
1015
 
    bus_name = dbus.service.BusName(u"org.mandos-system.Mandos", bus)
1016
 
    
 
676
    
 
677
    debug = options.debug
 
678
    
 
679
    if debug:
 
680
        console = logging.StreamHandler()
 
681
        # console.setLevel(logging.DEBUG)
 
682
        console.setFormatter(logging.Formatter\
 
683
                             ('%(levelname)s: %(message)s'))
 
684
        logger.addHandler(console)
 
685
        del console
 
686
    
 
687
    clients = Set()
1017
688
    def remove_from_clients(client):
1018
689
        clients.remove(client)
1019
690
        if not clients:
1020
 
            logger.critical(u"No clients left, exiting")
1021
 
            sys.exit()
 
691
            logger.debug(u"No clients left, exiting")
 
692
            killme()
1022
693
    
1023
 
    clients.update(Set(Client(name = section,
 
694
    clients.update(Set(Client(name=section,
1024
695
                              stop_hook = remove_from_clients,
1025
 
                              config
1026
 
                              = dict(client_config.items(section)))
 
696
                              **(dict(client_config\
 
697
                                      .items(section))))
1027
698
                       for section in client_config.sections()))
1028
 
    if not clients:
1029
 
        logger.critical(u"No clients defined")
1030
 
        sys.exit(1)
1031
 
    
1032
 
    if debug:
1033
 
        # Redirect stdin so all checkers get /dev/null
1034
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1035
 
        os.dup2(null, sys.stdin.fileno())
1036
 
        if null > 2:
1037
 
            os.close(null)
1038
 
    else:
1039
 
        # No console logging
1040
 
        logger.removeHandler(console)
1041
 
        # Close all input and output, do double fork, etc.
1042
 
        daemon()
1043
 
    
1044
 
    try:
1045
 
        pid = os.getpid()
1046
 
        pidfile.write(str(pid) + "\n")
1047
 
        pidfile.close()
1048
 
        del pidfile
1049
 
    except IOError:
1050
 
        logger.error(u"Could not write to file %r with PID %d",
1051
 
                     pidfilename, pid)
1052
 
    except NameError:
1053
 
        # "pidfile" was never created
1054
 
        pass
1055
 
    del pidfilename
 
699
    
 
700
    if not debug:
 
701
        daemon(False, False)
1056
702
    
1057
703
    def cleanup():
1058
704
        "Cleanup function; run on exit"
1072
718
    
1073
719
    if not debug:
1074
720
        signal.signal(signal.SIGINT, signal.SIG_IGN)
1075
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1076
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
721
    signal.signal(signal.SIGHUP, lambda signum, frame: killme())
 
722
    signal.signal(signal.SIGTERM, lambda signum, frame: killme())
1077
723
    
1078
724
    for client in clients:
1079
725
        client.start()
1080
726
    
1081
 
    tcp_server.enable()
1082
 
    tcp_server.server_activate()
1083
 
    
1084
 
    # Find out what port we got
1085
 
    service.port = tcp_server.socket.getsockname()[1]
1086
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1087
 
                u" scope_id %d" % tcp_server.socket.getsockname())
1088
 
    
1089
 
    #service.interface = tcp_server.socket.getsockname()[3]
1090
 
    
1091
 
    try:
1092
 
        # From the Avahi example code
1093
 
        server.connect_to_signal("StateChanged", server_state_changed)
1094
 
        try:
1095
 
            server_state_changed(server.GetState())
1096
 
        except dbus.exceptions.DBusException, error:
1097
 
            logger.critical(u"DBusException: %s", error)
1098
 
            sys.exit(1)
1099
 
        # End of Avahi example code
1100
 
        
1101
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1102
 
                             lambda *args, **kwargs:
1103
 
                             (tcp_server.handle_request
1104
 
                              (*args[2:], **kwargs) or True))
1105
 
        
1106
 
        logger.debug(u"Starting main loop")
 
727
    tcp_server = IPv6_TCPServer((options.address, options.port),
 
728
                                tcp_handler,
 
729
                                options=options,
 
730
                                clients=clients)
 
731
    # Find out what random port we got
 
732
    global servicePort
 
733
    servicePort = tcp_server.socket.getsockname()[1]
 
734
    logger.debug(u"Now listening on port %d", servicePort)
 
735
    
 
736
    if options.interface is not None:
 
737
        global serviceInterface
 
738
        serviceInterface = if_nametoindex(options.interface)
 
739
    
 
740
    # From the Avahi example code
 
741
    server.connect_to_signal("StateChanged", server_state_changed)
 
742
    try:
 
743
        server_state_changed(server.GetState())
 
744
    except dbus.exceptions.DBusException, error:
 
745
        logger.critical(u"DBusException: %s", error)
 
746
        killme(1)
 
747
    # End of Avahi example code
 
748
    
 
749
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
750
                         lambda *args, **kwargs:
 
751
                         tcp_server.handle_request(*args[2:],
 
752
                                                   **kwargs) or True)
 
753
    try:
 
754
        logger.debug("Starting main loop")
 
755
        main_loop_started = True
1107
756
        main_loop.run()
1108
 
    except AvahiError, error:
1109
 
        logger.critical(u"AvahiError: %s" + unicode(error))
1110
 
        sys.exit(1)
1111
757
    except KeyboardInterrupt:
1112
758
        if debug:
1113
759
            print
 
760
    
 
761
    sys.exit(exitstatus)
1114
762
 
1115
763
if __name__ == '__main__':
1116
764
    main()