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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: "AvahiService.add", "AvahiService.remove",
 
10
# "server_state_changed", "entry_group_state_changed", and some lines
 
11
# in "main".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2008,2009 Teddy Hogeborn
15
 
# Copyright © 2008,2009 Björn Påhlsson
 
14
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
16
15
# 
17
16
# This program is free software: you can redistribute it and/or modify
18
17
# it under the terms of the GNU General Public License as published by
25
24
#     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
29
# Contact the authors at <mandos@fukt.bsnet.se>.
32
30
# 
33
31
 
34
 
from __future__ import division, with_statement, absolute_import
 
32
from __future__ import division
35
33
 
36
34
import SocketServer
37
35
import socket
38
 
import optparse
 
36
import select
 
37
from optparse import OptionParser
39
38
import datetime
40
39
import errno
41
40
import gnutls.crypto
55
54
import stat
56
55
import logging
57
56
import logging.handlers
58
 
import pwd
59
 
from contextlib import closing
60
57
 
61
58
import dbus
62
 
import dbus.service
63
59
import gobject
64
60
import avahi
65
61
from dbus.mainloop.glib import DBusGMainLoop
66
62
import ctypes
67
 
import ctypes.util
68
 
 
69
 
version = "1.0.5"
 
63
 
 
64
# Brief description of the operation of this program:
 
65
# 
 
66
# This server announces itself as a Zeroconf service.  Connecting
 
67
# clients use the TLS protocol, with the unusual quirk that this
 
68
# server program acts as a TLS "client" while a connecting client acts
 
69
# as a TLS "server".  The client (acting as a TLS "server") must
 
70
# supply an OpenPGP certificate, and the fingerprint of this
 
71
# certificate is used by this server to look up (in a list read from a
 
72
# file at start time) which binary blob to give the client.  No other
 
73
# authentication or authorization is done by this server.
 
74
 
70
75
 
71
76
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 [%(process)d]: %(levelname)s:'
77
 
                        ' %(message)s'))
 
77
syslogger = logging.handlers.SysLogHandler\
 
78
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
 
79
syslogger.setFormatter(logging.Formatter\
 
80
                        ('%(levelname)s: %(message)s'))
78
81
logger.addHandler(syslogger)
 
82
del syslogger
79
83
 
80
 
console = logging.StreamHandler()
81
 
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
82
 
                                       ' %(levelname)s: %(message)s'))
83
 
logger.addHandler(console)
84
84
 
85
85
class AvahiError(Exception):
86
 
    def __init__(self, value, *args, **kwargs):
 
86
    def __init__(self, value):
87
87
        self.value = value
88
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
89
 
    def __unicode__(self):
90
 
        return unicode(repr(self.value))
 
88
    def __str__(self):
 
89
        return repr(self.value)
91
90
 
92
91
class AvahiServiceError(AvahiError):
93
92
    pass
97
96
 
98
97
 
99
98
class AvahiService(object):
100
 
    """An Avahi (Zeroconf) service.
101
 
    Attributes:
 
99
    """
102
100
    interface: integer; avahi.IF_UNSPEC or an interface index.
103
101
               Used to optionally bind to the specified interface.
104
 
    name: string; Example: 'Mandos'
105
 
    type: string; Example: '_mandos._tcp'.
106
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
107
 
    port: integer; what port to announce
108
 
    TXT: list of strings; TXT record for the service
109
 
    domain: string; Domain to publish on, default to .local if empty.
110
 
    host: string; Host to publish records for, default is localhost
111
 
    max_renames: integer; maximum number of renames
112
 
    rename_count: integer; counter so we only rename after collisions
113
 
                  a sensible number of times
 
102
    name = string; Example: "Mandos"
 
103
    type = string; Example: "_mandos._tcp".
 
104
                   See <http://www.dns-sd.org/ServiceTypes.html>
 
105
    port = integer; what port to announce
 
106
    TXT = list of strings; TXT record for the service
 
107
    domain = string; Domain to publish on, default to .local if empty.
 
108
    host = string; Host to publish records for, default to localhost
 
109
                   if empty.
 
110
    max_renames = integer; maximum number of renames
 
111
    rename_count = integer; counter so we only rename after collisions
 
112
                   a sensible number of times
114
113
    """
115
114
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
116
 
                 servicetype = None, port = None, TXT = None,
117
 
                 domain = "", host = "", max_renames = 32768,
118
 
                 protocol = avahi.PROTO_UNSPEC):
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
119
118
        self.interface = interface
120
119
        self.name = name
121
 
        self.type = servicetype
 
120
        self.type = type
122
121
        self.port = port
123
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
124
126
        self.domain = domain
125
127
        self.host = host
126
128
        self.rename_count = 0
127
 
        self.max_renames = max_renames
128
 
        self.protocol = protocol
129
129
    def rename(self):
130
130
        """Derived from the Avahi example code"""
131
131
        if self.rename_count >= self.max_renames:
132
 
            logger.critical(u"No suitable Zeroconf service name found"
133
 
                            u" after %i retries, exiting.",
134
 
                            self.rename_count)
135
 
            raise AvahiServiceError(u"Too many renames")
136
 
        self.name = server.GetAlternativeServiceName(self.name)
137
 
        logger.info(u"Changing Zeroconf service name to %r ...",
138
 
                    str(self.name))
139
 
        syslogger.setFormatter(logging.Formatter
140
 
                               ('Mandos (%s): %%(levelname)s:'
141
 
                                ' %%(message)s' % self.name))
 
132
            logger.critical(u"No suitable service name found after %i"
 
133
                            u" retries, exiting.", rename_count)
 
134
            raise AvahiServiceError("Too many renames")
 
135
        name = server.GetAlternativeServiceName(name)
 
136
        logger.notice(u"Changing name to %r ...", name)
142
137
        self.remove()
143
138
        self.add()
144
139
        self.rename_count += 1
150
145
        """Derived from the Avahi example code"""
151
146
        global group
152
147
        if group is None:
153
 
            group = dbus.Interface(bus.get_object
154
 
                                   (avahi.DBUS_NAME,
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
155
150
                                    server.EntryGroupNew()),
156
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
157
152
            group.connect_to_signal('StateChanged',
158
153
                                    entry_group_state_changed)
159
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
160
155
                     service.name, service.type)
161
156
        group.AddService(
162
157
                self.interface,         # interface
163
 
                self.protocol,          # protocol
 
158
                avahi.PROTO_INET6,      # protocol
164
159
                dbus.UInt32(0),         # flags
165
160
                self.name, self.type,
166
161
                self.domain, self.host,
173
168
# End of Avahi example code
174
169
 
175
170
 
176
 
def _datetime_to_dbus(dt, variant_level=0):
177
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
178
 
    return dbus.String(dt.isoformat(), variant_level=variant_level)
179
 
 
180
 
 
181
 
class Client(dbus.service.Object):
 
171
class Client(object):
182
172
    """A representation of a client host served by this server.
183
173
    Attributes:
184
 
    name:       string; from the config file, used in log messages and
185
 
                        D-Bus identifiers
 
174
    name:      string; from the config file, used in log messages
186
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
187
176
                 uniquely identify the client
188
 
    secret:     bytestring; sent verbatim (over TLS) to client
189
 
    host:       string; available for use by the checker command
190
 
    created:    datetime.datetime(); (UTC) object creation
191
 
    last_enabled: datetime.datetime(); (UTC)
192
 
    enabled:    bool()
193
 
    last_checked_ok: datetime.datetime(); (UTC) or None
194
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
195
 
                                      until this client is invalid
196
 
    interval:   datetime.timedelta(); How often to start a new checker
197
 
    disable_hook:  If set, called by disable() as disable_hook(self)
198
 
    checker:    subprocess.Popen(); a running checker process used
199
 
                                    to see if the client lives.
200
 
                                    'None' if no process is running.
 
177
    secret:    bytestring; sent verbatim (over TLS) to client
 
178
    fqdn:      string (FQDN); available for use by the checker command
 
179
    created:   datetime.datetime(); object creation, not client host
 
180
    last_checked_ok: datetime.datetime() or None if not yet checked OK
 
181
    timeout:   datetime.timedelta(); How long from last_checked_ok
 
182
                                     until this client is invalid
 
183
    interval:  datetime.timedelta(); How often to start a new checker
 
184
    stop_hook: If set, called by stop() as stop_hook(self)
 
185
    checker:   subprocess.Popen(); a running checker process used
 
186
                                   to see if the client lives.
 
187
                                   'None' if no process is running.
201
188
    checker_initiator_tag: a gobject event source tag, or None
202
 
    disable_initiator_tag:    - '' -
 
189
    stop_initiator_tag:    - '' -
203
190
    checker_callback_tag:  - '' -
204
191
    checker_command: string; External command which is run to check if
205
192
                     client lives.  %() expansions are done at
206
193
                     runtime with vars(self) as dict, so that for
207
194
                     instance %(name)s can be used in the command.
208
 
    use_dbus: bool(); Whether to provide D-Bus interface and signals
209
 
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
 
195
    Private attibutes:
 
196
    _timeout: Real variable for 'timeout'
 
197
    _interval: Real variable for 'interval'
 
198
    _timeout_milliseconds: Used when calling gobject.timeout_add()
 
199
    _interval_milliseconds: - '' -
210
200
    """
211
 
    def timeout_milliseconds(self):
212
 
        "Return the 'timeout' attribute in milliseconds"
213
 
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
214
 
                + (self.timeout.seconds * 1000)
215
 
                + (self.timeout.microseconds // 1000))
216
 
    
217
 
    def interval_milliseconds(self):
218
 
        "Return the 'interval' attribute in milliseconds"
219
 
        return ((self.interval.days * 24 * 60 * 60 * 1000)
220
 
                + (self.interval.seconds * 1000)
221
 
                + (self.interval.microseconds // 1000))
222
 
    
223
 
    def __init__(self, name = None, disable_hook=None, config=None,
224
 
                 use_dbus=True):
225
 
        """Note: the 'checker' key in 'config' sets the
226
 
        'checker_command' attribute and *not* the 'checker'
227
 
        attribute."""
 
201
    def _set_timeout(self, timeout):
 
202
        "Setter function for 'timeout' attribute"
 
203
        self._timeout = timeout
 
204
        self._timeout_milliseconds = ((self.timeout.days
 
205
                                       * 24 * 60 * 60 * 1000)
 
206
                                      + (self.timeout.seconds * 1000)
 
207
                                      + (self.timeout.microseconds
 
208
                                         // 1000))
 
209
    timeout = property(lambda self: self._timeout,
 
210
                       _set_timeout)
 
211
    del _set_timeout
 
212
    def _set_interval(self, interval):
 
213
        "Setter function for 'interval' attribute"
 
214
        self._interval = interval
 
215
        self._interval_milliseconds = ((self.interval.days
 
216
                                        * 24 * 60 * 60 * 1000)
 
217
                                       + (self.interval.seconds
 
218
                                          * 1000)
 
219
                                       + (self.interval.microseconds
 
220
                                          // 1000))
 
221
    interval = property(lambda self: self._interval,
 
222
                        _set_interval)
 
223
    del _set_interval
 
224
    def __init__(self, name=None, stop_hook=None, fingerprint=None,
 
225
                 secret=None, secfile=None, fqdn=None, timeout=None,
 
226
                 interval=-1, checker=None):
 
227
        """Note: the 'checker' argument sets the 'checker_command'
 
228
        attribute and not the 'checker' attribute.."""
228
229
        self.name = name
229
 
        if config is None:
230
 
            config = {}
231
230
        logger.debug(u"Creating client %r", self.name)
232
 
        self.use_dbus = False   # During __init__
233
 
        # Uppercase and remove spaces from fingerprint for later
234
 
        # comparison purposes with return value from the fingerprint()
235
 
        # function
236
 
        self.fingerprint = (config["fingerprint"].upper()
237
 
                            .replace(u" ", u""))
 
231
        # Uppercase and remove spaces from fingerprint
 
232
        # for later comparison purposes with return value of
 
233
        # the fingerprint() function
 
234
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
238
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
239
 
        if "secret" in config:
240
 
            self.secret = config["secret"].decode(u"base64")
241
 
        elif "secfile" in config:
242
 
            with closing(open(os.path.expanduser
243
 
                              (os.path.expandvars
244
 
                               (config["secfile"])))) as secfile:
245
 
                self.secret = secfile.read()
 
236
        if secret:
 
237
            self.secret = secret.decode(u"base64")
 
238
        elif secfile:
 
239
            sf = open(secfile)
 
240
            self.secret = sf.read()
 
241
            sf.close()
246
242
        else:
247
243
            raise TypeError(u"No secret or secfile for client %s"
248
244
                            % self.name)
249
 
        self.host = config.get("host", "")
250
 
        self.created = datetime.datetime.utcnow()
251
 
        self.enabled = False
252
 
        self.last_enabled = None
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
253
247
        self.last_checked_ok = None
254
 
        self.timeout = string_to_delta(config["timeout"])
255
 
        self.interval = string_to_delta(config["interval"])
256
 
        self.disable_hook = disable_hook
 
248
        self.timeout = string_to_delta(timeout)
 
249
        self.interval = string_to_delta(interval)
 
250
        self.stop_hook = stop_hook
257
251
        self.checker = None
258
252
        self.checker_initiator_tag = None
259
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
260
254
        self.checker_callback_tag = None
261
 
        self.checker_command = config["checker"]
262
 
        self.last_connect = None
263
 
        # Only now, when this client is initialized, can it show up on
264
 
        # the D-Bus
265
 
        self.use_dbus = use_dbus
266
 
        if self.use_dbus:
267
 
            self.dbus_object_path = (dbus.ObjectPath
268
 
                                     ("/clients/"
269
 
                                      + self.name.replace(".", "_")))
270
 
            dbus.service.Object.__init__(self, bus,
271
 
                                         self.dbus_object_path)
272
 
    
273
 
    def enable(self):
 
255
        self.check_command = checker
 
256
    def start(self):
274
257
        """Start this client's checker and timeout hooks"""
275
 
        self.last_enabled = datetime.datetime.utcnow()
276
258
        # Schedule a new checker to be started an 'interval' from now,
277
259
        # and every interval from then on.
278
 
        self.checker_initiator_tag = (gobject.timeout_add
279
 
                                      (self.interval_milliseconds(),
280
 
                                       self.start_checker))
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
281
263
        # Also start a new checker *right now*.
282
264
        self.start_checker()
283
 
        # Schedule a disable() when 'timeout' has passed
284
 
        self.disable_initiator_tag = (gobject.timeout_add
285
 
                                   (self.timeout_milliseconds(),
286
 
                                    self.disable))
287
 
        self.enabled = True
288
 
        if self.use_dbus:
289
 
            # Emit D-Bus signals
290
 
            self.PropertyChanged(dbus.String(u"enabled"),
291
 
                                 dbus.Boolean(True, variant_level=1))
292
 
            self.PropertyChanged(dbus.String(u"last_enabled"),
293
 
                                 (_datetime_to_dbus(self.last_enabled,
294
 
                                                    variant_level=1)))
295
 
    
296
 
    def disable(self):
297
 
        """Disable this client."""
298
 
        if not getattr(self, "enabled", False):
 
265
        # Schedule a stop() when 'timeout' has passed
 
266
        self.stop_initiator_tag = gobject.timeout_add\
 
267
                                  (self._timeout_milliseconds,
 
268
                                   self.stop)
 
269
    def stop(self):
 
270
        """Stop this client.
 
271
        The possibility that a client might be restarted is left open,
 
272
        but not currently used."""
 
273
        # If this client doesn't have a secret, it is already stopped.
 
274
        if self.secret:
 
275
            logger.debug(u"Stopping client %s", self.name)
 
276
            self.secret = None
 
277
        else:
299
278
            return False
300
 
        logger.info(u"Disabling client %s", self.name)
301
 
        if getattr(self, "disable_initiator_tag", False):
302
 
            gobject.source_remove(self.disable_initiator_tag)
303
 
            self.disable_initiator_tag = None
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
304
282
        if getattr(self, "checker_initiator_tag", False):
305
283
            gobject.source_remove(self.checker_initiator_tag)
306
284
            self.checker_initiator_tag = None
307
285
        self.stop_checker()
308
 
        if self.disable_hook:
309
 
            self.disable_hook(self)
310
 
        self.enabled = False
311
 
        if self.use_dbus:
312
 
            # Emit D-Bus signal
313
 
            self.PropertyChanged(dbus.String(u"enabled"),
314
 
                                 dbus.Boolean(False, variant_level=1))
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
315
288
        # Do not run this again if called by a gobject.timeout_add
316
289
        return False
317
 
    
318
290
    def __del__(self):
319
 
        self.disable_hook = None
320
 
        self.disable()
321
 
    
322
 
    def checker_callback(self, pid, condition, command):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
323
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
324
296
        self.checker_callback_tag = None
325
297
        self.checker = None
326
 
        if self.use_dbus:
327
 
            # Emit D-Bus signal
328
 
            self.PropertyChanged(dbus.String(u"checker_running"),
329
 
                                 dbus.Boolean(False, variant_level=1))
330
 
        if os.WIFEXITED(condition):
331
 
            exitstatus = os.WEXITSTATUS(condition)
332
 
            if exitstatus == 0:
333
 
                logger.info(u"Checker for %(name)s succeeded",
334
 
                            vars(self))
335
 
                self.checked_ok()
336
 
            else:
337
 
                logger.info(u"Checker for %(name)s failed",
338
 
                            vars(self))
339
 
            if self.use_dbus:
340
 
                # Emit D-Bus signal
341
 
                self.CheckerCompleted(dbus.Int16(exitstatus),
342
 
                                      dbus.Int64(condition),
343
 
                                      dbus.String(command))
344
 
        else:
 
298
        if os.WIFEXITED(condition) \
 
299
               and (os.WEXITSTATUS(condition) == 0):
 
300
            logger.debug(u"Checker for %(name)s succeeded",
 
301
                         vars(self))
 
302
            self.last_checked_ok = now
 
303
            gobject.source_remove(self.stop_initiator_tag)
 
304
            self.stop_initiator_tag = gobject.timeout_add\
 
305
                                      (self._timeout_milliseconds,
 
306
                                       self.stop)
 
307
        elif not os.WIFEXITED(condition):
345
308
            logger.warning(u"Checker for %(name)s crashed?",
346
309
                           vars(self))
347
 
            if self.use_dbus:
348
 
                # Emit D-Bus signal
349
 
                self.CheckerCompleted(dbus.Int16(-1),
350
 
                                      dbus.Int64(condition),
351
 
                                      dbus.String(command))
352
 
    
353
 
    def checked_ok(self):
354
 
        """Bump up the timeout for this client.
355
 
        This should only be called when the client has been seen,
356
 
        alive and well.
357
 
        """
358
 
        self.last_checked_ok = datetime.datetime.utcnow()
359
 
        gobject.source_remove(self.disable_initiator_tag)
360
 
        self.disable_initiator_tag = (gobject.timeout_add
361
 
                                      (self.timeout_milliseconds(),
362
 
                                       self.disable))
363
 
        if self.use_dbus:
364
 
            # Emit D-Bus signal
365
 
            self.PropertyChanged(
366
 
                dbus.String(u"last_checked_ok"),
367
 
                (_datetime_to_dbus(self.last_checked_ok,
368
 
                                   variant_level=1)))
369
 
    
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
370
313
    def start_checker(self):
371
314
        """Start a new checker subprocess if one is not running.
372
315
        If a checker already exists, leave it running and do
381
324
        # is as it should be.
382
325
        if self.checker is None:
383
326
            try:
384
 
                # In case checker_command has exactly one % operator
385
 
                command = self.checker_command % self.host
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
386
329
            except TypeError:
387
330
                # Escape attributes for the shell
388
331
                escaped_attrs = dict((key, re.escape(str(val)))
389
332
                                     for key, val in
390
333
                                     vars(self).iteritems())
391
334
                try:
392
 
                    command = self.checker_command % escaped_attrs
 
335
                    command = self.check_command % escaped_attrs
393
336
                except TypeError, error:
394
337
                    logger.error(u'Could not format string "%s":'
395
 
                                 u' %s', self.checker_command, error)
 
338
                                 u' %s', self.check_command, error)
396
339
                    return True # Try again later
397
340
            try:
398
 
                logger.info(u"Starting checker %r for %s",
399
 
                            command, self.name)
400
 
                # We don't need to redirect stdout and stderr, since
401
 
                # in normal mode, that is already done by daemon(),
402
 
                # and in debug mode we don't want to.  (Stdin is
403
 
                # always replaced by /dev/null.)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
404
343
                self.checker = subprocess.Popen(command,
405
344
                                                close_fds=True,
406
345
                                                shell=True, cwd="/")
407
 
                if self.use_dbus:
408
 
                    # Emit D-Bus signal
409
 
                    self.CheckerStarted(command)
410
 
                    self.PropertyChanged(
411
 
                        dbus.String("checker_running"),
412
 
                        dbus.Boolean(True, variant_level=1))
413
 
                self.checker_callback_tag = (gobject.child_watch_add
414
 
                                             (self.checker.pid,
415
 
                                              self.checker_callback,
416
 
                                              data=command))
417
 
                # The checker may have completed before the gobject
418
 
                # watch was added.  Check for this.
419
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
420
 
                if pid:
421
 
                    gobject.source_remove(self.checker_callback_tag)
422
 
                    self.checker_callback(pid, status, command)
423
 
            except OSError, error:
 
346
                self.checker_callback_tag = gobject.child_watch_add\
 
347
                                            (self.checker.pid,
 
348
                                             self.checker_callback)
 
349
            except subprocess.OSError, error:
424
350
                logger.error(u"Failed to start subprocess: %s",
425
351
                             error)
426
352
        # Re-run this periodically if run by gobject.timeout_add
427
353
        return True
428
 
    
429
354
    def stop_checker(self):
430
355
        """Force the checker process, if any, to stop."""
431
356
        if self.checker_callback_tag:
433
358
            self.checker_callback_tag = None
434
359
        if getattr(self, "checker", None) is None:
435
360
            return
436
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
361
        logger.debug("Stopping checker for %(name)s", vars(self))
437
362
        try:
438
363
            os.kill(self.checker.pid, signal.SIGTERM)
439
364
            #os.sleep(0.5)
443
368
            if error.errno != errno.ESRCH: # No such process
444
369
                raise
445
370
        self.checker = None
446
 
        if self.use_dbus:
447
 
            self.PropertyChanged(dbus.String(u"checker_running"),
448
 
                                 dbus.Boolean(False, variant_level=1))
449
 
    
450
371
    def still_valid(self):
451
372
        """Has the timeout not yet passed for this client?"""
452
 
        if not getattr(self, "enabled", False):
453
 
            return False
454
 
        now = datetime.datetime.utcnow()
 
373
        now = datetime.datetime.now()
455
374
        if self.last_checked_ok is None:
456
375
            return now < (self.created + self.timeout)
457
376
        else:
458
377
            return now < (self.last_checked_ok + self.timeout)
459
 
    
460
 
    ## D-Bus methods & signals
461
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
462
 
    
463
 
    # CheckedOK - method
464
 
    CheckedOK = dbus.service.method(_interface)(checked_ok)
465
 
    CheckedOK.__name__ = "CheckedOK"
466
 
    
467
 
    # CheckerCompleted - signal
468
 
    @dbus.service.signal(_interface, signature="nxs")
469
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
470
 
        "D-Bus signal"
471
 
        pass
472
 
    
473
 
    # CheckerStarted - signal
474
 
    @dbus.service.signal(_interface, signature="s")
475
 
    def CheckerStarted(self, command):
476
 
        "D-Bus signal"
477
 
        pass
478
 
    
479
 
    # GetAllProperties - method
480
 
    @dbus.service.method(_interface, out_signature="a{sv}")
481
 
    def GetAllProperties(self):
482
 
        "D-Bus method"
483
 
        return dbus.Dictionary({
484
 
                dbus.String("name"):
485
 
                    dbus.String(self.name, variant_level=1),
486
 
                dbus.String("fingerprint"):
487
 
                    dbus.String(self.fingerprint, variant_level=1),
488
 
                dbus.String("host"):
489
 
                    dbus.String(self.host, variant_level=1),
490
 
                dbus.String("created"):
491
 
                    _datetime_to_dbus(self.created, variant_level=1),
492
 
                dbus.String("last_enabled"):
493
 
                    (_datetime_to_dbus(self.last_enabled,
494
 
                                       variant_level=1)
495
 
                     if self.last_enabled is not None
496
 
                     else dbus.Boolean(False, variant_level=1)),
497
 
                dbus.String("enabled"):
498
 
                    dbus.Boolean(self.enabled, variant_level=1),
499
 
                dbus.String("last_checked_ok"):
500
 
                    (_datetime_to_dbus(self.last_checked_ok,
501
 
                                       variant_level=1)
502
 
                     if self.last_checked_ok is not None
503
 
                     else dbus.Boolean (False, variant_level=1)),
504
 
                dbus.String("timeout"):
505
 
                    dbus.UInt64(self.timeout_milliseconds(),
506
 
                                variant_level=1),
507
 
                dbus.String("interval"):
508
 
                    dbus.UInt64(self.interval_milliseconds(),
509
 
                                variant_level=1),
510
 
                dbus.String("checker"):
511
 
                    dbus.String(self.checker_command,
512
 
                                variant_level=1),
513
 
                dbus.String("checker_running"):
514
 
                    dbus.Boolean(self.checker is not None,
515
 
                                 variant_level=1),
516
 
                dbus.String("object_path"):
517
 
                    dbus.ObjectPath(self.dbus_object_path,
518
 
                                    variant_level=1)
519
 
                }, signature="sv")
520
 
    
521
 
    # IsStillValid - method
522
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
523
 
                    (still_valid))
524
 
    IsStillValid.__name__ = "IsStillValid"
525
 
    
526
 
    # PropertyChanged - signal
527
 
    @dbus.service.signal(_interface, signature="sv")
528
 
    def PropertyChanged(self, property, value):
529
 
        "D-Bus signal"
530
 
        pass
531
 
    
532
 
    # SetChecker - method
533
 
    @dbus.service.method(_interface, in_signature="s")
534
 
    def SetChecker(self, checker):
535
 
        "D-Bus setter method"
536
 
        self.checker_command = checker
537
 
        # Emit D-Bus signal
538
 
        self.PropertyChanged(dbus.String(u"checker"),
539
 
                             dbus.String(self.checker_command,
540
 
                                         variant_level=1))
541
 
    
542
 
    # SetHost - method
543
 
    @dbus.service.method(_interface, in_signature="s")
544
 
    def SetHost(self, host):
545
 
        "D-Bus setter method"
546
 
        self.host = host
547
 
        # Emit D-Bus signal
548
 
        self.PropertyChanged(dbus.String(u"host"),
549
 
                             dbus.String(self.host, variant_level=1))
550
 
    
551
 
    # SetInterval - method
552
 
    @dbus.service.method(_interface, in_signature="t")
553
 
    def SetInterval(self, milliseconds):
554
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
555
 
        # Emit D-Bus signal
556
 
        self.PropertyChanged(dbus.String(u"interval"),
557
 
                             (dbus.UInt64(self.interval_milliseconds(),
558
 
                                          variant_level=1)))
559
 
    
560
 
    # SetSecret - method
561
 
    @dbus.service.method(_interface, in_signature="ay",
562
 
                         byte_arrays=True)
563
 
    def SetSecret(self, secret):
564
 
        "D-Bus setter method"
565
 
        self.secret = str(secret)
566
 
    
567
 
    # SetTimeout - method
568
 
    @dbus.service.method(_interface, in_signature="t")
569
 
    def SetTimeout(self, milliseconds):
570
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
571
 
        # Emit D-Bus signal
572
 
        self.PropertyChanged(dbus.String(u"timeout"),
573
 
                             (dbus.UInt64(self.timeout_milliseconds(),
574
 
                                          variant_level=1)))
575
 
    
576
 
    # Enable - method
577
 
    Enable = dbus.service.method(_interface)(enable)
578
 
    Enable.__name__ = "Enable"
579
 
    
580
 
    # StartChecker - method
581
 
    @dbus.service.method(_interface)
582
 
    def StartChecker(self):
583
 
        "D-Bus method"
584
 
        self.start_checker()
585
 
    
586
 
    # Disable - method
587
 
    @dbus.service.method(_interface)
588
 
    def Disable(self):
589
 
        "D-Bus method"
590
 
        self.disable()
591
 
    
592
 
    # StopChecker - method
593
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
594
 
    StopChecker.__name__ = "StopChecker"
595
 
    
596
 
    del _interface
597
378
 
598
379
 
599
380
def peer_certificate(session):
600
381
    "Return the peer's OpenPGP certificate as a bytestring"
601
382
    # If not an OpenPGP certificate...
602
 
    if (gnutls.library.functions
603
 
        .gnutls_certificate_type_get(session._c_object)
604
 
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
383
    if gnutls.library.functions.gnutls_certificate_type_get\
 
384
            (session._c_object) \
 
385
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
605
386
        # ...do the normal thing
606
387
        return session.peer_certificate
607
 
    list_size = ctypes.c_uint(1)
608
 
    cert_list = (gnutls.library.functions
609
 
                 .gnutls_certificate_get_peers
610
 
                 (session._c_object, ctypes.byref(list_size)))
611
 
    if not bool(cert_list) and list_size.value != 0:
612
 
        raise gnutls.errors.GNUTLSError("error getting peer"
613
 
                                        " certificate")
 
388
    list_size = ctypes.c_uint()
 
389
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
390
        (session._c_object, ctypes.byref(list_size))
614
391
    if list_size.value == 0:
615
392
        return None
616
393
    cert = cert_list[0]
619
396
 
620
397
def fingerprint(openpgp):
621
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
622
 
    # New GnuTLS "datum" with the OpenPGP public key
623
 
    datum = (gnutls.library.types
624
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
625
 
                                         ctypes.POINTER
626
 
                                         (ctypes.c_ubyte)),
627
 
                             ctypes.c_uint(len(openpgp))))
628
399
    # New empty GnuTLS certificate
629
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
630
 
    (gnutls.library.functions
631
 
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
401
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
402
        (ctypes.byref(crt))
 
403
    # New GnuTLS "datum" with the OpenPGP public key
 
404
    datum = gnutls.library.types.gnutls_datum_t\
 
405
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
406
                     ctypes.POINTER(ctypes.c_ubyte)),
 
407
         ctypes.c_uint(len(openpgp)))
632
408
    # Import the OpenPGP public key into the certificate
633
 
    (gnutls.library.functions
634
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
635
 
                                gnutls.library.constants
636
 
                                .GNUTLS_OPENPGP_FMT_RAW))
637
 
    # Verify the self signature in the key
638
 
    crtverify = ctypes.c_uint()
639
 
    (gnutls.library.functions
640
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
641
 
    if crtverify.value != 0:
642
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
643
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
 
409
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
410
        (crt,
 
411
         ctypes.byref(datum),
 
412
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
644
413
    # New buffer for the fingerprint
645
 
    buf = ctypes.create_string_buffer(20)
646
 
    buf_len = ctypes.c_size_t()
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
647
416
    # Get the fingerprint from the certificate into the buffer
648
 
    (gnutls.library.functions
649
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
650
 
                                         ctypes.byref(buf_len)))
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
651
419
    # Deinit the certificate
652
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
653
421
    # Convert the buffer to a Python bytestring
654
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
655
423
    # Convert the bytestring to hexadecimal notation
656
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
657
425
    return hex_fpr
658
426
 
659
427
 
660
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
661
429
    """A TCP request handler class.
662
430
    Instantiated by IPv6_TCPServer for each request to handle it.
663
431
    Note: This will run in its own forked process."""
664
432
    
665
433
    def handle(self):
666
 
        logger.info(u"TCP connection from: %s",
667
 
                    unicode(self.client_address))
668
 
        session = (gnutls.connection
669
 
                   .ClientSession(self.request,
670
 
                                  gnutls.connection
671
 
                                  .X509Credentials()))
672
 
        
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
 
673
437
        line = self.request.makefile().readline()
674
438
        logger.debug(u"Protocol version: %r", line)
675
439
        try:
679
443
            logger.error(u"Unknown protocol version: %s", error)
680
444
            return
681
445
        
 
446
        session = gnutls.connection.ClientSession\
 
447
                  (self.request, gnutls.connection.X509Credentials())
682
448
        # Note: gnutls.connection.X509Credentials is really a generic
683
449
        # GnuTLS certificate credentials object so long as no X.509
684
450
        # keys are added to it.  Therefore, we can use it here despite
685
451
        # using OpenPGP certificates.
686
452
        
687
453
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
688
 
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
689
 
        #                     "+DHE-DSS"))
690
 
        # Use a fallback default, since this MUST be set.
691
 
        priority = self.server.settings.get("priority", "NORMAL")
692
 
        (gnutls.library.functions
693
 
         .gnutls_priority_set_direct(session._c_object,
694
 
                                     priority, None))
 
454
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
455
        #                "+DHE-DSS"))
 
456
        priority = "NORMAL"             # Fallback default, since this
 
457
                                        # MUST be set.
 
458
        if self.server.settings["priority"]:
 
459
            priority = self.server.settings["priority"]
 
460
        gnutls.library.functions.gnutls_priority_set_direct\
 
461
            (session._c_object, priority, None);
695
462
        
696
463
        try:
697
464
            session.handshake()
698
465
        except gnutls.errors.GNUTLSError, error:
699
 
            logger.warning(u"Handshake failed: %s", error)
 
466
            logger.debug(u"Handshake failed: %s", error)
700
467
            # Do not run session.bye() here: the session is not
701
468
            # established.  Just abandon the request.
702
469
            return
703
 
        logger.debug(u"Handshake succeeded")
704
470
        try:
705
471
            fpr = fingerprint(peer_certificate(session))
706
472
        except (TypeError, gnutls.errors.GNUTLSError), error:
707
 
            logger.warning(u"Bad certificate: %s", error)
 
473
            logger.debug(u"Bad certificate: %s", error)
708
474
            session.bye()
709
475
            return
710
476
        logger.debug(u"Fingerprint: %s", fpr)
711
 
        
 
477
        client = None
712
478
        for c in self.server.clients:
713
479
            if c.fingerprint == fpr:
714
480
                client = c
715
481
                break
716
 
        else:
717
 
            logger.warning(u"Client not found for fingerprint: %s",
718
 
                           fpr)
 
482
        if not client:
 
483
            logger.debug(u"Client not found for fingerprint: %s", fpr)
719
484
            session.bye()
720
485
            return
721
486
        # Have to check if client.still_valid(), since it is possible
722
487
        # that the client timed out while establishing the GnuTLS
723
488
        # session.
724
489
        if not client.still_valid():
725
 
            logger.warning(u"Client %(name)s is invalid",
726
 
                           vars(client))
 
490
            logger.debug(u"Client %(name)s is invalid", vars(client))
727
491
            session.bye()
728
492
            return
729
 
        ## This won't work here, since we're in a fork.
730
 
        # client.checked_ok()
731
493
        sent_size = 0
732
494
        while sent_size < len(client.secret):
733
495
            sent = session.send(client.secret[sent_size:])
738
500
        session.bye()
739
501
 
740
502
 
741
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
742
 
                     SocketServer.TCPServer, object):
743
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port.
 
503
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
504
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
744
505
    Attributes:
745
506
        settings:       Server settings
746
507
        clients:        Set() of Client objects
747
 
        enabled:        Boolean; whether this server is activated yet
748
508
    """
749
509
    address_family = socket.AF_INET6
750
510
    def __init__(self, *args, **kwargs):
754
514
        if "clients" in kwargs:
755
515
            self.clients = kwargs["clients"]
756
516
            del kwargs["clients"]
757
 
        if "use_ipv6" in kwargs:
758
 
            if not kwargs["use_ipv6"]:
759
 
                self.address_family = socket.AF_INET
760
 
            del kwargs["use_ipv6"]
761
 
        self.enabled = False
762
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
517
        return super(type(self), self).__init__(*args, **kwargs)
763
518
    def server_bind(self):
764
519
        """This overrides the normal server_bind() function
765
520
        to bind to an interface if one was specified, and also NOT to
773
528
                                       self.settings["interface"])
774
529
            except socket.error, error:
775
530
                if error[0] == errno.EPERM:
776
 
                    logger.error(u"No permission to"
777
 
                                 u" bind to interface %s",
778
 
                                 self.settings["interface"])
 
531
                    logger.warning(u"No permission to"
 
532
                                   u" bind to interface %s",
 
533
                                   self.settings["interface"])
779
534
                else:
780
 
                    raise
 
535
                    raise error
781
536
        # Only bind(2) the socket if we really need to.
782
537
        if self.server_address[0] or self.server_address[1]:
783
538
            if not self.server_address[0]:
784
 
                if self.address_family == socket.AF_INET6:
785
 
                    any_address = "::" # in6addr_any
786
 
                else:
787
 
                    any_address = socket.INADDR_ANY
788
 
                self.server_address = (any_address,
 
539
                in6addr_any = "::"
 
540
                self.server_address = (in6addr_any,
789
541
                                       self.server_address[1])
790
 
            elif not self.server_address[1]:
 
542
            elif self.server_address[1] is None:
791
543
                self.server_address = (self.server_address[0],
792
544
                                       0)
793
 
#                 if self.settings["interface"]:
794
 
#                     self.server_address = (self.server_address[0],
795
 
#                                            0, # port
796
 
#                                            0, # flowinfo
797
 
#                                            if_nametoindex
798
 
#                                            (self.settings
799
 
#                                             ["interface"]))
800
 
            return super(IPv6_TCPServer, self).server_bind()
801
 
    def server_activate(self):
802
 
        if self.enabled:
803
 
            return super(IPv6_TCPServer, self).server_activate()
804
 
    def enable(self):
805
 
        self.enabled = True
 
545
            return super(type(self), self).server_bind()
806
546
 
807
547
 
808
548
def string_to_delta(interval):
809
549
    """Parse a string and return a datetime.timedelta
810
 
    
 
550
 
811
551
    >>> string_to_delta('7d')
812
552
    datetime.timedelta(7)
813
553
    >>> string_to_delta('60s')
818
558
    datetime.timedelta(1)
819
559
    >>> string_to_delta(u'1w')
820
560
    datetime.timedelta(7)
821
 
    >>> string_to_delta('5m 30s')
822
 
    datetime.timedelta(0, 330)
823
561
    """
824
 
    timevalue = datetime.timedelta(0)
825
 
    for s in interval.split():
826
 
        try:
827
 
            suffix = unicode(s[-1])
828
 
            value = int(s[:-1])
829
 
            if suffix == u"d":
830
 
                delta = datetime.timedelta(value)
831
 
            elif suffix == u"s":
832
 
                delta = datetime.timedelta(0, value)
833
 
            elif suffix == u"m":
834
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
835
 
            elif suffix == u"h":
836
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
837
 
            elif suffix == u"w":
838
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
839
 
            else:
840
 
                raise ValueError
841
 
        except (ValueError, IndexError):
 
562
    try:
 
563
        suffix=unicode(interval[-1])
 
564
        value=int(interval[:-1])
 
565
        if suffix == u"d":
 
566
            delta = datetime.timedelta(value)
 
567
        elif suffix == u"s":
 
568
            delta = datetime.timedelta(0, value)
 
569
        elif suffix == u"m":
 
570
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
571
        elif suffix == u"h":
 
572
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
573
        elif suffix == u"w":
 
574
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
575
        else:
842
576
            raise ValueError
843
 
        timevalue += delta
844
 
    return timevalue
 
577
    except (ValueError, IndexError):
 
578
        raise ValueError
 
579
    return delta
845
580
 
846
581
 
847
582
def server_state_changed(state):
848
583
    """Derived from the Avahi example code"""
849
584
    if state == avahi.SERVER_COLLISION:
850
 
        logger.error(u"Zeroconf server name collision")
 
585
        logger.warning(u"Server name collision")
851
586
        service.remove()
852
587
    elif state == avahi.SERVER_RUNNING:
853
588
        service.add()
855
590
 
856
591
def entry_group_state_changed(state, error):
857
592
    """Derived from the Avahi example code"""
858
 
    logger.debug(u"Avahi state change: %i", state)
 
593
    logger.debug(u"state change: %i", state)
859
594
    
860
595
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
861
 
        logger.debug(u"Zeroconf service established.")
 
596
        logger.debug(u"Service established.")
862
597
    elif state == avahi.ENTRY_GROUP_COLLISION:
863
 
        logger.warning(u"Zeroconf service name collision.")
 
598
        logger.warning(u"Service name collision.")
864
599
        service.rename()
865
600
    elif state == avahi.ENTRY_GROUP_FAILURE:
866
 
        logger.critical(u"Avahi: Error in group state changed %s",
 
601
        logger.critical(u"Error in group state changed %s",
867
602
                        unicode(error))
868
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
603
        raise AvahiGroupError("State changed: %s", str(error))
869
604
 
870
 
def if_nametoindex(interface):
 
605
def if_nametoindex(interface, _func=[None]):
871
606
    """Call the C function if_nametoindex(), or equivalent"""
872
 
    global if_nametoindex
 
607
    if _func[0] is not None:
 
608
        return _func[0](interface)
873
609
    try:
874
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
875
 
                          (ctypes.util.find_library("c"))
876
 
                          .if_nametoindex)
 
610
        if "ctypes.util" not in sys.modules:
 
611
            import ctypes.util
 
612
        while True:
 
613
            try:
 
614
                libc = ctypes.cdll.LoadLibrary\
 
615
                       (ctypes.util.find_library("c"))
 
616
                _func[0] = libc.if_nametoindex
 
617
                return _func[0](interface)
 
618
            except IOError, e:
 
619
                if e != errno.EINTR:
 
620
                    raise
877
621
    except (OSError, AttributeError):
878
622
        if "struct" not in sys.modules:
879
623
            import struct
880
624
        if "fcntl" not in sys.modules:
881
625
            import fcntl
882
 
        def if_nametoindex(interface):
 
626
        def the_hard_way(interface):
883
627
            "Get an interface index the hard way, i.e. using fcntl()"
884
628
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
885
 
            with closing(socket.socket()) as s:
886
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
887
 
                                    struct.pack("16s16x", interface))
 
629
            s = socket.socket()
 
630
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
631
                                struct.pack("16s16x", interface))
 
632
            s.close()
888
633
            interface_index = struct.unpack("I", ifreq[16:20])[0]
889
634
            return interface_index
890
 
    return if_nametoindex(interface)
891
 
 
892
 
 
893
 
def daemon(nochdir = False, noclose = False):
 
635
        _func[0] = the_hard_way
 
636
        return _func[0](interface)
 
637
 
 
638
 
 
639
def daemon(nochdir, noclose):
894
640
    """See daemon(3).  Standard BSD Unix function.
895
641
    This should really exist as os.daemon, but it doesn't (yet)."""
896
642
    if os.fork():
898
644
    os.setsid()
899
645
    if not nochdir:
900
646
        os.chdir("/")
901
 
    if os.fork():
902
 
        sys.exit()
903
647
    if not noclose:
904
648
        # Close all standard open file descriptors
905
649
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
914
658
 
915
659
 
916
660
def main():
917
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
661
    global main_loop_started
 
662
    main_loop_started = False
 
663
    
 
664
    parser = OptionParser()
918
665
    parser.add_option("-i", "--interface", type="string",
919
666
                      metavar="IF", help="Bind to interface IF")
920
667
    parser.add_option("-a", "--address", type="string",
921
668
                      help="Address to listen for requests on")
922
669
    parser.add_option("-p", "--port", type="int",
923
670
                      help="Port number to receive requests on")
924
 
    parser.add_option("--check", action="store_true",
 
671
    parser.add_option("--check", action="store_true", default=False,
925
672
                      help="Run self-test")
926
 
    parser.add_option("--debug", action="store_true",
 
673
    parser.add_option("--debug", action="store_true", default=False,
927
674
                      help="Debug mode; run in foreground and log to"
928
675
                      " terminal")
929
676
    parser.add_option("--priority", type="string", help="GnuTLS"
934
681
                      default="/etc/mandos", metavar="DIR",
935
682
                      help="Directory to search for configuration"
936
683
                      " files")
937
 
    parser.add_option("--no-dbus", action="store_false",
938
 
                      dest="use_dbus",
939
 
                      help="Do not provide D-Bus system bus"
940
 
                      " interface")
941
 
    parser.add_option("--no-ipv6", action="store_false",
942
 
                      dest="use_ipv6", help="Do not use IPv6")
943
 
    options = parser.parse_args()[0]
 
684
    (options, args) = parser.parse_args()
944
685
    
945
686
    if options.check:
946
687
        import doctest
955
696
                        "priority":
956
697
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
957
698
                        "servicename": "Mandos",
958
 
                        "use_dbus": "True",
959
 
                        "use_ipv6": "True",
960
699
                        }
961
700
    
962
701
    # Parse config file for server-global settings
963
702
    server_config = ConfigParser.SafeConfigParser(server_defaults)
964
703
    del server_defaults
965
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
704
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
705
    server_section = "server"
966
706
    # Convert the SafeConfigParser object to a dict
967
 
    server_settings = server_config.defaults()
968
 
    # Use the appropriate methods on the non-string config options
969
 
    server_settings["debug"] = server_config.getboolean("DEFAULT",
970
 
                                                        "debug")
971
 
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
972
 
                                                           "use_dbus")
973
 
    server_settings["use_ipv6"] = server_config.getboolean("DEFAULT",
974
 
                                                           "use_ipv6")
975
 
    if server_settings["port"]:
976
 
        server_settings["port"] = server_config.getint("DEFAULT",
977
 
                                                       "port")
 
707
    server_settings = dict(server_config.items(server_section))
 
708
    # Use getboolean on the boolean config option
 
709
    server_settings["debug"] = server_config.getboolean\
 
710
                               (server_section, "debug")
978
711
    del server_config
979
712
    
980
713
    # Override the settings from the config file with command line
981
714
    # options, if set.
982
715
    for option in ("interface", "address", "port", "debug",
983
 
                   "priority", "servicename", "configdir",
984
 
                   "use_dbus", "use_ipv6"):
 
716
                   "priority", "servicename", "configdir"):
985
717
        value = getattr(options, option)
986
718
        if value is not None:
987
719
            server_settings[option] = value
988
720
    del options
989
721
    # Now we have our good server settings in "server_settings"
990
722
    
991
 
    # For convenience
992
 
    debug = server_settings["debug"]
993
 
    use_dbus = server_settings["use_dbus"]
994
 
    use_ipv6 = server_settings["use_ipv6"]
995
 
    
996
 
    if not debug:
997
 
        syslogger.setLevel(logging.WARNING)
998
 
        console.setLevel(logging.WARNING)
999
 
    
1000
 
    if server_settings["servicename"] != "Mandos":
1001
 
        syslogger.setFormatter(logging.Formatter
1002
 
                               ('Mandos (%s): %%(levelname)s:'
1003
 
                                ' %%(message)s'
1004
 
                                % server_settings["servicename"]))
1005
 
    
1006
723
    # Parse config file with clients
1007
724
    client_defaults = { "timeout": "1h",
1008
725
                        "interval": "5m",
1009
 
                        "checker": "fping -q -- %%(host)s",
1010
 
                        "host": "",
 
726
                        "checker": "fping -q -- %%(fqdn)s",
1011
727
                        }
1012
728
    client_config = ConfigParser.SafeConfigParser(client_defaults)
1013
729
    client_config.read(os.path.join(server_settings["configdir"],
1014
730
                                    "clients.conf"))
1015
731
    
1016
 
    clients = Set()
1017
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
1018
 
                                 server_settings["port"]),
1019
 
                                TCP_handler,
1020
 
                                settings=server_settings,
1021
 
                                clients=clients, use_ipv6=use_ipv6)
1022
 
    pidfilename = "/var/run/mandos.pid"
1023
 
    try:
1024
 
        pidfile = open(pidfilename, "w")
1025
 
    except IOError:
1026
 
        logger.error("Could not open file %r", pidfilename)
1027
 
    
1028
 
    try:
1029
 
        uid = pwd.getpwnam("_mandos").pw_uid
1030
 
        gid = pwd.getpwnam("_mandos").pw_gid
1031
 
    except KeyError:
1032
 
        try:
1033
 
            uid = pwd.getpwnam("mandos").pw_uid
1034
 
            gid = pwd.getpwnam("mandos").pw_gid
1035
 
        except KeyError:
1036
 
            try:
1037
 
                uid = pwd.getpwnam("nobody").pw_uid
1038
 
                gid = pwd.getpwnam("nogroup").pw_gid
1039
 
            except KeyError:
1040
 
                uid = 65534
1041
 
                gid = 65534
1042
 
    try:
1043
 
        os.setgid(gid)
1044
 
        os.setuid(uid)
1045
 
    except OSError, error:
1046
 
        if error[0] != errno.EPERM:
1047
 
            raise error
1048
 
    
1049
 
    # Enable all possible GnuTLS debugging
1050
 
    if debug:
1051
 
        # "Use a log level over 10 to enable all debugging options."
1052
 
        # - GnuTLS manual
1053
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1054
 
        
1055
 
        @gnutls.library.types.gnutls_log_func
1056
 
        def debug_gnutls(level, string):
1057
 
            logger.debug("GnuTLS: %s", string[:-1])
1058
 
        
1059
 
        (gnutls.library.functions
1060
 
         .gnutls_global_set_log_function(debug_gnutls))
1061
 
    
1062
732
    global service
1063
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1064
733
    service = AvahiService(name = server_settings["servicename"],
1065
 
                           servicetype = "_mandos._tcp",
1066
 
                           protocol = protocol)
 
734
                           type = "_mandos._tcp", );
1067
735
    if server_settings["interface"]:
1068
 
        service.interface = (if_nametoindex
1069
 
                             (server_settings["interface"]))
 
736
        service.interface = if_nametoindex(server_settings["interface"])
1070
737
    
1071
738
    global main_loop
1072
739
    global bus
1075
742
    DBusGMainLoop(set_as_default=True )
1076
743
    main_loop = gobject.MainLoop()
1077
744
    bus = dbus.SystemBus()
1078
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1079
 
                                           avahi.DBUS_PATH_SERVER),
1080
 
                            avahi.DBUS_INTERFACE_SERVER)
 
745
    server = dbus.Interface(
 
746
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
747
            avahi.DBUS_INTERFACE_SERVER )
1081
748
    # End of Avahi example code
1082
 
    if use_dbus:
1083
 
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1084
 
    
1085
 
    clients.update(Set(Client(name = section,
1086
 
                              config
1087
 
                              = dict(client_config.items(section)),
1088
 
                              use_dbus = use_dbus)
 
749
    
 
750
    debug = server_settings["debug"]
 
751
    
 
752
    if debug:
 
753
        console = logging.StreamHandler()
 
754
        # console.setLevel(logging.DEBUG)
 
755
        console.setFormatter(logging.Formatter\
 
756
                             ('%(levelname)s: %(message)s'))
 
757
        logger.addHandler(console)
 
758
        del console
 
759
    
 
760
    clients = Set()
 
761
    def remove_from_clients(client):
 
762
        clients.remove(client)
 
763
        if not clients:
 
764
            logger.debug(u"No clients left, exiting")
 
765
            sys.exit()
 
766
    
 
767
    clients.update(Set(Client(name=section,
 
768
                              stop_hook = remove_from_clients,
 
769
                              **(dict(client_config\
 
770
                                      .items(section))))
1089
771
                       for section in client_config.sections()))
1090
 
    if not clients:
1091
 
        logger.warning(u"No clients defined")
1092
 
    
1093
 
    if debug:
1094
 
        # Redirect stdin so all checkers get /dev/null
1095
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1096
 
        os.dup2(null, sys.stdin.fileno())
1097
 
        if null > 2:
1098
 
            os.close(null)
1099
 
    else:
1100
 
        # No console logging
1101
 
        logger.removeHandler(console)
1102
 
        # Close all input and output, do double fork, etc.
1103
 
        daemon()
1104
 
    
1105
 
    try:
1106
 
        pid = os.getpid()
1107
 
        pidfile.write(str(pid) + "\n")
1108
 
        pidfile.close()
1109
 
        del pidfile
1110
 
    except IOError:
1111
 
        logger.error(u"Could not write to file %r with PID %d",
1112
 
                     pidfilename, pid)
1113
 
    except NameError:
1114
 
        # "pidfile" was never created
1115
 
        pass
1116
 
    del pidfilename
 
772
    
 
773
    if not debug:
 
774
        daemon(False, False)
1117
775
    
1118
776
    def cleanup():
1119
777
        "Cleanup function; run on exit"
1126
784
        
1127
785
        while clients:
1128
786
            client = clients.pop()
1129
 
            client.disable_hook = None
1130
 
            client.disable()
 
787
            client.stop_hook = None
 
788
            client.stop()
1131
789
    
1132
790
    atexit.register(cleanup)
1133
791
    
1136
794
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1137
795
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1138
796
    
1139
 
    if use_dbus:
1140
 
        class MandosServer(dbus.service.Object):
1141
 
            """A D-Bus proxy object"""
1142
 
            def __init__(self):
1143
 
                dbus.service.Object.__init__(self, bus, "/")
1144
 
            _interface = u"se.bsnet.fukt.Mandos"
1145
 
            
1146
 
            @dbus.service.signal(_interface, signature="oa{sv}")
1147
 
            def ClientAdded(self, objpath, properties):
1148
 
                "D-Bus signal"
1149
 
                pass
1150
 
            
1151
 
            @dbus.service.signal(_interface, signature="os")
1152
 
            def ClientRemoved(self, objpath, name):
1153
 
                "D-Bus signal"
1154
 
                pass
1155
 
            
1156
 
            @dbus.service.method(_interface, out_signature="ao")
1157
 
            def GetAllClients(self):
1158
 
                "D-Bus method"
1159
 
                return dbus.Array(c.dbus_object_path for c in clients)
1160
 
            
1161
 
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1162
 
            def GetAllClientsWithProperties(self):
1163
 
                "D-Bus method"
1164
 
                return dbus.Dictionary(
1165
 
                    ((c.dbus_object_path, c.GetAllProperties())
1166
 
                     for c in clients),
1167
 
                    signature="oa{sv}")
1168
 
            
1169
 
            @dbus.service.method(_interface, in_signature="o")
1170
 
            def RemoveClient(self, object_path):
1171
 
                "D-Bus method"
1172
 
                for c in clients:
1173
 
                    if c.dbus_object_path == object_path:
1174
 
                        clients.remove(c)
1175
 
                        # Don't signal anything except ClientRemoved
1176
 
                        c.use_dbus = False
1177
 
                        c.disable()
1178
 
                        # Emit D-Bus signal
1179
 
                        self.ClientRemoved(object_path, c.name)
1180
 
                        return
1181
 
                raise KeyError
1182
 
            
1183
 
            del _interface
1184
 
        
1185
 
        mandos_server = MandosServer()
1186
 
    
1187
797
    for client in clients:
1188
 
        if use_dbus:
1189
 
            # Emit D-Bus signal
1190
 
            mandos_server.ClientAdded(client.dbus_object_path,
1191
 
                                      client.GetAllProperties())
1192
 
        client.enable()
1193
 
    
1194
 
    tcp_server.enable()
1195
 
    tcp_server.server_activate()
1196
 
    
 
798
        client.start()
 
799
    
 
800
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
801
                                 server_settings["port"]),
 
802
                                tcp_handler,
 
803
                                settings=server_settings,
 
804
                                clients=clients)
1197
805
    # Find out what port we got
1198
806
    service.port = tcp_server.socket.getsockname()[1]
1199
 
    if use_ipv6:
1200
 
        logger.info(u"Now listening on address %r, port %d,"
1201
 
                    " flowinfo %d, scope_id %d"
1202
 
                    % tcp_server.socket.getsockname())
1203
 
    else:                       # IPv4
1204
 
        logger.info(u"Now listening on address %r, port %d"
1205
 
                    % tcp_server.socket.getsockname())
 
807
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
808
                 u" scope_id %d" % tcp_server.socket.getsockname())
1206
809
    
1207
810
    #service.interface = tcp_server.socket.getsockname()[3]
1208
811
    
1218
821
        
1219
822
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1220
823
                             lambda *args, **kwargs:
1221
 
                             (tcp_server.handle_request
1222
 
                              (*args[2:], **kwargs) or True))
 
824
                             tcp_server.handle_request\
 
825
                             (*args[2:], **kwargs) or True)
1223
826
        
1224
 
        logger.debug(u"Starting main loop")
 
827
        logger.debug("Starting main loop")
 
828
        main_loop_started = True
1225
829
        main_loop.run()
1226
830
    except AvahiError, error:
1227
 
        logger.critical(u"AvahiError: %s", error)
 
831
        logger.critical(u"AvahiError: %s" + unicode(error))
1228
832
        sys.exit(1)
1229
833
    except KeyboardInterrupt:
1230
834
        if debug:
1231
 
            print >> sys.stderr
1232
 
        logger.debug("Server received KeyboardInterrupt")
1233
 
    logger.debug("Server exiting")
 
835
            print
1234
836
 
1235
837
if __name__ == '__main__':
1236
838
    main()