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  • Committer: Teddy Hogeborn
  • Date: 2009-02-07 04:50:39 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
                                   "/scripts/local-top/mandos" to
                                   "/scripts/init-premount/mandos".
  (uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".

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Lines of Context:
mandos
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# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
8
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# following functions: "AvahiService.add", "AvahiService.remove",
10
 
# "server_state_changed", "entry_group_state_changed", and some lines
11
 
# in "main".
 
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".
12
12
# 
13
13
# Everything else is
14
 
# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
 
14
# Copyright © 2008,2009 Teddy Hogeborn
 
15
# Copyright © 2008,2009 Björn Påhlsson
15
16
# 
16
17
# This program is free software: you can redistribute it and/or modify
17
18
# it under the terms of the GNU General Public License as published by
24
25
#     GNU General Public License for more details.
25
26
# 
26
27
# You should have received a copy of the GNU General Public License
27
 
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
28
# along with this program.  If not, see
 
29
# <http://www.gnu.org/licenses/>.
28
30
# 
29
31
# Contact the authors at <mandos@fukt.bsnet.se>.
30
32
# 
31
33
 
32
 
from __future__ import division
 
34
from __future__ import division, with_statement, absolute_import
33
35
 
34
36
import SocketServer
35
37
import socket
36
 
import select
37
 
from optparse import OptionParser
 
38
import optparse
38
39
import datetime
39
40
import errno
40
41
import gnutls.crypto
54
55
import stat
55
56
import logging
56
57
import logging.handlers
 
58
import pwd
 
59
from contextlib import closing
57
60
 
58
61
import dbus
 
62
import dbus.service
59
63
import gobject
60
64
import avahi
61
65
from dbus.mainloop.glib import DBusGMainLoop
62
66
import ctypes
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
 
 
 
67
import ctypes.util
 
68
 
 
69
version = "1.0.5"
75
70
 
76
71
logger = logging.Logger('mandos')
77
 
syslogger = logging.handlers.SysLogHandler\
78
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON)
79
 
syslogger.setFormatter(logging.Formatter\
80
 
                        ('%(levelname)s: %(message)s'))
 
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'))
81
78
logger.addHandler(syslogger)
82
 
del syslogger
83
79
 
 
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):
 
86
    def __init__(self, value, *args, **kwargs):
87
87
        self.value = value
88
 
    def __str__(self):
89
 
        return repr(self.value)
 
88
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
89
    def __unicode__(self):
 
90
        return unicode(repr(self.value))
90
91
 
91
92
class AvahiServiceError(AvahiError):
92
93
    pass
96
97
 
97
98
 
98
99
class AvahiService(object):
99
 
    """
 
100
    """An Avahi (Zeroconf) service.
 
101
    Attributes:
100
102
    interface: integer; avahi.IF_UNSPEC or an interface index.
101
103
               Used to optionally bind to the specified interface.
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
 
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
113
114
    """
114
115
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
115
 
                 type = None, port = None, TXT = None, domain = "",
116
 
                 host = "", max_renames = 12):
117
 
        """An Avahi (Zeroconf) service. """
 
116
                 servicetype = None, port = None, TXT = None,
 
117
                 domain = "", host = "", max_renames = 32768):
118
118
        self.interface = interface
119
119
        self.name = name
120
 
        self.type = type
 
120
        self.type = servicetype
121
121
        self.port = port
122
 
        if TXT is None:
123
 
            self.TXT = []
124
 
        else:
125
 
            self.TXT = TXT
 
122
        self.TXT = TXT if TXT is not None else []
126
123
        self.domain = domain
127
124
        self.host = host
128
125
        self.rename_count = 0
 
126
        self.max_renames = max_renames
129
127
    def rename(self):
130
128
        """Derived from the Avahi example code"""
131
129
        if self.rename_count >= self.max_renames:
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)
 
130
            logger.critical(u"No suitable Zeroconf service name found"
 
131
                            u" after %i retries, exiting.",
 
132
                            self.rename_count)
 
133
            raise AvahiServiceError(u"Too many renames")
 
134
        self.name = server.GetAlternativeServiceName(self.name)
 
135
        logger.info(u"Changing Zeroconf service name to %r ...",
 
136
                    str(self.name))
 
137
        syslogger.setFormatter(logging.Formatter
 
138
                               ('Mandos (%s): %%(levelname)s:'
 
139
                                ' %%(message)s' % self.name))
137
140
        self.remove()
138
141
        self.add()
139
142
        self.rename_count += 1
145
148
        """Derived from the Avahi example code"""
146
149
        global group
147
150
        if group is None:
148
 
            group = dbus.Interface\
149
 
                    (bus.get_object(avahi.DBUS_NAME,
 
151
            group = dbus.Interface(bus.get_object
 
152
                                   (avahi.DBUS_NAME,
150
153
                                    server.EntryGroupNew()),
151
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
154
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
155
            group.connect_to_signal('StateChanged',
153
156
                                    entry_group_state_changed)
154
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
 
157
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
155
158
                     service.name, service.type)
156
159
        group.AddService(
157
160
                self.interface,         # interface
168
171
# End of Avahi example code
169
172
 
170
173
 
171
 
class Client(object):
 
174
def _datetime_to_dbus(dt, variant_level=0):
 
175
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
176
    return dbus.String(dt.isoformat(), variant_level=variant_level)
 
177
 
 
178
 
 
179
class Client(dbus.service.Object):
172
180
    """A representation of a client host served by this server.
173
181
    Attributes:
174
 
    name:      string; from the config file, used in log messages
 
182
    name:       string; from the config file, used in log messages and
 
183
                        D-Bus identifiers
175
184
    fingerprint: string (40 or 32 hexadecimal digits); used to
176
185
                 uniquely identify the client
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.
 
186
    secret:     bytestring; sent verbatim (over TLS) to client
 
187
    host:       string; available for use by the checker command
 
188
    created:    datetime.datetime(); (UTC) object creation
 
189
    last_enabled: datetime.datetime(); (UTC)
 
190
    enabled:    bool()
 
191
    last_checked_ok: datetime.datetime(); (UTC) or None
 
192
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
193
                                      until this client is invalid
 
194
    interval:   datetime.timedelta(); How often to start a new checker
 
195
    disable_hook:  If set, called by disable() as disable_hook(self)
 
196
    checker:    subprocess.Popen(); a running checker process used
 
197
                                    to see if the client lives.
 
198
                                    'None' if no process is running.
188
199
    checker_initiator_tag: a gobject event source tag, or None
189
 
    stop_initiator_tag:    - '' -
 
200
    disable_initiator_tag:    - '' -
190
201
    checker_callback_tag:  - '' -
191
202
    checker_command: string; External command which is run to check if
192
203
                     client lives.  %() expansions are done at
193
204
                     runtime with vars(self) as dict, so that for
194
205
                     instance %(name)s can be used in the command.
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: - '' -
 
206
    use_dbus: bool(); Whether to provide D-Bus interface and signals
 
207
    dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
200
208
    """
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.."""
 
209
    def timeout_milliseconds(self):
 
210
        "Return the 'timeout' attribute in milliseconds"
 
211
        return ((self.timeout.days * 24 * 60 * 60 * 1000)
 
212
                + (self.timeout.seconds * 1000)
 
213
                + (self.timeout.microseconds // 1000))
 
214
    
 
215
    def interval_milliseconds(self):
 
216
        "Return the 'interval' attribute in milliseconds"
 
217
        return ((self.interval.days * 24 * 60 * 60 * 1000)
 
218
                + (self.interval.seconds * 1000)
 
219
                + (self.interval.microseconds // 1000))
 
220
    
 
221
    def __init__(self, name = None, disable_hook=None, config=None,
 
222
                 use_dbus=True):
 
223
        """Note: the 'checker' key in 'config' sets the
 
224
        'checker_command' attribute and *not* the 'checker'
 
225
        attribute."""
229
226
        self.name = name
 
227
        if config is None:
 
228
            config = {}
230
229
        logger.debug(u"Creating client %r", self.name)
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"")
 
230
        self.use_dbus = False   # During __init__
 
231
        # Uppercase and remove spaces from fingerprint for later
 
232
        # comparison purposes with return value from the fingerprint()
 
233
        # function
 
234
        self.fingerprint = (config["fingerprint"].upper()
 
235
                            .replace(u" ", u""))
235
236
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
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()
 
237
        if "secret" in config:
 
238
            self.secret = config["secret"].decode(u"base64")
 
239
        elif "secfile" in config:
 
240
            with closing(open(os.path.expanduser
 
241
                              (os.path.expandvars
 
242
                               (config["secfile"])))) as secfile:
 
243
                self.secret = secfile.read()
242
244
        else:
243
245
            raise TypeError(u"No secret or secfile for client %s"
244
246
                            % self.name)
245
 
        self.fqdn = fqdn
246
 
        self.created = datetime.datetime.now()
 
247
        self.host = config.get("host", "")
 
248
        self.created = datetime.datetime.utcnow()
 
249
        self.enabled = False
 
250
        self.last_enabled = None
247
251
        self.last_checked_ok = None
248
 
        self.timeout = string_to_delta(timeout)
249
 
        self.interval = string_to_delta(interval)
250
 
        self.stop_hook = stop_hook
 
252
        self.timeout = string_to_delta(config["timeout"])
 
253
        self.interval = string_to_delta(config["interval"])
 
254
        self.disable_hook = disable_hook
251
255
        self.checker = None
252
256
        self.checker_initiator_tag = None
253
 
        self.stop_initiator_tag = None
 
257
        self.disable_initiator_tag = None
254
258
        self.checker_callback_tag = None
255
 
        self.check_command = checker
256
 
    def start(self):
 
259
        self.checker_command = config["checker"]
 
260
        self.last_connect = None
 
261
        # Only now, when this client is initialized, can it show up on
 
262
        # the D-Bus
 
263
        self.use_dbus = use_dbus
 
264
        if self.use_dbus:
 
265
            self.dbus_object_path = (dbus.ObjectPath
 
266
                                     ("/clients/"
 
267
                                      + self.name.replace(".", "_")))
 
268
            dbus.service.Object.__init__(self, bus,
 
269
                                         self.dbus_object_path)
 
270
    
 
271
    def enable(self):
257
272
        """Start this client's checker and timeout hooks"""
 
273
        self.last_enabled = datetime.datetime.utcnow()
258
274
        # Schedule a new checker to be started an 'interval' from now,
259
275
        # and every interval from then on.
260
 
        self.checker_initiator_tag = gobject.timeout_add\
261
 
                                     (self._interval_milliseconds,
262
 
                                      self.start_checker)
 
276
        self.checker_initiator_tag = (gobject.timeout_add
 
277
                                      (self.interval_milliseconds(),
 
278
                                       self.start_checker))
263
279
        # Also start a new checker *right now*.
264
280
        self.start_checker()
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:
 
281
        # Schedule a disable() when 'timeout' has passed
 
282
        self.disable_initiator_tag = (gobject.timeout_add
 
283
                                   (self.timeout_milliseconds(),
 
284
                                    self.disable))
 
285
        self.enabled = True
 
286
        if self.use_dbus:
 
287
            # Emit D-Bus signals
 
288
            self.PropertyChanged(dbus.String(u"enabled"),
 
289
                                 dbus.Boolean(True, variant_level=1))
 
290
            self.PropertyChanged(dbus.String(u"last_enabled"),
 
291
                                 (_datetime_to_dbus(self.last_enabled,
 
292
                                                    variant_level=1)))
 
293
    
 
294
    def disable(self):
 
295
        """Disable this client."""
 
296
        if not getattr(self, "enabled", False):
278
297
            return False
279
 
        if getattr(self, "stop_initiator_tag", False):
280
 
            gobject.source_remove(self.stop_initiator_tag)
281
 
            self.stop_initiator_tag = None
 
298
        logger.info(u"Disabling client %s", self.name)
 
299
        if getattr(self, "disable_initiator_tag", False):
 
300
            gobject.source_remove(self.disable_initiator_tag)
 
301
            self.disable_initiator_tag = None
282
302
        if getattr(self, "checker_initiator_tag", False):
283
303
            gobject.source_remove(self.checker_initiator_tag)
284
304
            self.checker_initiator_tag = None
285
305
        self.stop_checker()
286
 
        if self.stop_hook:
287
 
            self.stop_hook(self)
 
306
        if self.disable_hook:
 
307
            self.disable_hook(self)
 
308
        self.enabled = False
 
309
        if self.use_dbus:
 
310
            # Emit D-Bus signal
 
311
            self.PropertyChanged(dbus.String(u"enabled"),
 
312
                                 dbus.Boolean(False, variant_level=1))
288
313
        # Do not run this again if called by a gobject.timeout_add
289
314
        return False
 
315
    
290
316
    def __del__(self):
291
 
        self.stop_hook = None
292
 
        self.stop()
293
 
    def checker_callback(self, pid, condition):
 
317
        self.disable_hook = None
 
318
        self.disable()
 
319
    
 
320
    def checker_callback(self, pid, condition, command):
294
321
        """The checker has completed, so take appropriate actions."""
295
 
        now = datetime.datetime.now()
296
322
        self.checker_callback_tag = None
297
323
        self.checker = None
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):
 
324
        if self.use_dbus:
 
325
            # Emit D-Bus signal
 
326
            self.PropertyChanged(dbus.String(u"checker_running"),
 
327
                                 dbus.Boolean(False, variant_level=1))
 
328
        if os.WIFEXITED(condition):
 
329
            exitstatus = os.WEXITSTATUS(condition)
 
330
            if exitstatus == 0:
 
331
                logger.info(u"Checker for %(name)s succeeded",
 
332
                            vars(self))
 
333
                self.checked_ok()
 
334
            else:
 
335
                logger.info(u"Checker for %(name)s failed",
 
336
                            vars(self))
 
337
            if self.use_dbus:
 
338
                # Emit D-Bus signal
 
339
                self.CheckerCompleted(dbus.Int16(exitstatus),
 
340
                                      dbus.Int64(condition),
 
341
                                      dbus.String(command))
 
342
        else:
308
343
            logger.warning(u"Checker for %(name)s crashed?",
309
344
                           vars(self))
310
 
        else:
311
 
            logger.debug(u"Checker for %(name)s failed",
312
 
                         vars(self))
 
345
            if self.use_dbus:
 
346
                # Emit D-Bus signal
 
347
                self.CheckerCompleted(dbus.Int16(-1),
 
348
                                      dbus.Int64(condition),
 
349
                                      dbus.String(command))
 
350
    
 
351
    def checked_ok(self):
 
352
        """Bump up the timeout for this client.
 
353
        This should only be called when the client has been seen,
 
354
        alive and well.
 
355
        """
 
356
        self.last_checked_ok = datetime.datetime.utcnow()
 
357
        gobject.source_remove(self.disable_initiator_tag)
 
358
        self.disable_initiator_tag = (gobject.timeout_add
 
359
                                      (self.timeout_milliseconds(),
 
360
                                       self.disable))
 
361
        if self.use_dbus:
 
362
            # Emit D-Bus signal
 
363
            self.PropertyChanged(
 
364
                dbus.String(u"last_checked_ok"),
 
365
                (_datetime_to_dbus(self.last_checked_ok,
 
366
                                   variant_level=1)))
 
367
    
313
368
    def start_checker(self):
314
369
        """Start a new checker subprocess if one is not running.
315
370
        If a checker already exists, leave it running and do
324
379
        # is as it should be.
325
380
        if self.checker is None:
326
381
            try:
327
 
                # In case check_command has exactly one % operator
328
 
                command = self.check_command % self.fqdn
 
382
                # In case checker_command has exactly one % operator
 
383
                command = self.checker_command % self.host
329
384
            except TypeError:
330
385
                # Escape attributes for the shell
331
386
                escaped_attrs = dict((key, re.escape(str(val)))
332
387
                                     for key, val in
333
388
                                     vars(self).iteritems())
334
389
                try:
335
 
                    command = self.check_command % escaped_attrs
 
390
                    command = self.checker_command % escaped_attrs
336
391
                except TypeError, error:
337
392
                    logger.error(u'Could not format string "%s":'
338
 
                                 u' %s', self.check_command, error)
 
393
                                 u' %s', self.checker_command, error)
339
394
                    return True # Try again later
340
395
            try:
341
 
                logger.debug(u"Starting checker %r for %s",
342
 
                             command, self.name)
 
396
                logger.info(u"Starting checker %r for %s",
 
397
                            command, self.name)
 
398
                # We don't need to redirect stdout and stderr, since
 
399
                # in normal mode, that is already done by daemon(),
 
400
                # and in debug mode we don't want to.  (Stdin is
 
401
                # always replaced by /dev/null.)
343
402
                self.checker = subprocess.Popen(command,
344
403
                                                close_fds=True,
345
404
                                                shell=True, cwd="/")
346
 
                self.checker_callback_tag = gobject.child_watch_add\
347
 
                                            (self.checker.pid,
348
 
                                             self.checker_callback)
349
 
            except subprocess.OSError, error:
 
405
                if self.use_dbus:
 
406
                    # Emit D-Bus signal
 
407
                    self.CheckerStarted(command)
 
408
                    self.PropertyChanged(
 
409
                        dbus.String("checker_running"),
 
410
                        dbus.Boolean(True, variant_level=1))
 
411
                self.checker_callback_tag = (gobject.child_watch_add
 
412
                                             (self.checker.pid,
 
413
                                              self.checker_callback,
 
414
                                              data=command))
 
415
            except OSError, error:
350
416
                logger.error(u"Failed to start subprocess: %s",
351
417
                             error)
352
418
        # Re-run this periodically if run by gobject.timeout_add
353
419
        return True
 
420
    
354
421
    def stop_checker(self):
355
422
        """Force the checker process, if any, to stop."""
356
423
        if self.checker_callback_tag:
358
425
            self.checker_callback_tag = None
359
426
        if getattr(self, "checker", None) is None:
360
427
            return
361
 
        logger.debug("Stopping checker for %(name)s", vars(self))
 
428
        logger.debug(u"Stopping checker for %(name)s", vars(self))
362
429
        try:
363
430
            os.kill(self.checker.pid, signal.SIGTERM)
364
431
            #os.sleep(0.5)
368
435
            if error.errno != errno.ESRCH: # No such process
369
436
                raise
370
437
        self.checker = None
 
438
        if self.use_dbus:
 
439
            self.PropertyChanged(dbus.String(u"checker_running"),
 
440
                                 dbus.Boolean(False, variant_level=1))
 
441
    
371
442
    def still_valid(self):
372
443
        """Has the timeout not yet passed for this client?"""
373
 
        now = datetime.datetime.now()
 
444
        if not getattr(self, "enabled", False):
 
445
            return False
 
446
        now = datetime.datetime.utcnow()
374
447
        if self.last_checked_ok is None:
375
448
            return now < (self.created + self.timeout)
376
449
        else:
377
450
            return now < (self.last_checked_ok + self.timeout)
 
451
    
 
452
    ## D-Bus methods & signals
 
453
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
454
    
 
455
    # CheckedOK - method
 
456
    CheckedOK = dbus.service.method(_interface)(checked_ok)
 
457
    CheckedOK.__name__ = "CheckedOK"
 
458
    
 
459
    # CheckerCompleted - signal
 
460
    @dbus.service.signal(_interface, signature="nxs")
 
461
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
462
        "D-Bus signal"
 
463
        pass
 
464
    
 
465
    # CheckerStarted - signal
 
466
    @dbus.service.signal(_interface, signature="s")
 
467
    def CheckerStarted(self, command):
 
468
        "D-Bus signal"
 
469
        pass
 
470
    
 
471
    # GetAllProperties - method
 
472
    @dbus.service.method(_interface, out_signature="a{sv}")
 
473
    def GetAllProperties(self):
 
474
        "D-Bus method"
 
475
        return dbus.Dictionary({
 
476
                dbus.String("name"):
 
477
                    dbus.String(self.name, variant_level=1),
 
478
                dbus.String("fingerprint"):
 
479
                    dbus.String(self.fingerprint, variant_level=1),
 
480
                dbus.String("host"):
 
481
                    dbus.String(self.host, variant_level=1),
 
482
                dbus.String("created"):
 
483
                    _datetime_to_dbus(self.created, variant_level=1),
 
484
                dbus.String("last_enabled"):
 
485
                    (_datetime_to_dbus(self.last_enabled,
 
486
                                       variant_level=1)
 
487
                     if self.last_enabled is not None
 
488
                     else dbus.Boolean(False, variant_level=1)),
 
489
                dbus.String("enabled"):
 
490
                    dbus.Boolean(self.enabled, variant_level=1),
 
491
                dbus.String("last_checked_ok"):
 
492
                    (_datetime_to_dbus(self.last_checked_ok,
 
493
                                       variant_level=1)
 
494
                     if self.last_checked_ok is not None
 
495
                     else dbus.Boolean (False, variant_level=1)),
 
496
                dbus.String("timeout"):
 
497
                    dbus.UInt64(self.timeout_milliseconds(),
 
498
                                variant_level=1),
 
499
                dbus.String("interval"):
 
500
                    dbus.UInt64(self.interval_milliseconds(),
 
501
                                variant_level=1),
 
502
                dbus.String("checker"):
 
503
                    dbus.String(self.checker_command,
 
504
                                variant_level=1),
 
505
                dbus.String("checker_running"):
 
506
                    dbus.Boolean(self.checker is not None,
 
507
                                 variant_level=1),
 
508
                dbus.String("object_path"):
 
509
                    dbus.ObjectPath(self.dbus_object_path,
 
510
                                    variant_level=1)
 
511
                }, signature="sv")
 
512
    
 
513
    # IsStillValid - method
 
514
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
 
515
                    (still_valid))
 
516
    IsStillValid.__name__ = "IsStillValid"
 
517
    
 
518
    # PropertyChanged - signal
 
519
    @dbus.service.signal(_interface, signature="sv")
 
520
    def PropertyChanged(self, property, value):
 
521
        "D-Bus signal"
 
522
        pass
 
523
    
 
524
    # SetChecker - method
 
525
    @dbus.service.method(_interface, in_signature="s")
 
526
    def SetChecker(self, checker):
 
527
        "D-Bus setter method"
 
528
        self.checker_command = checker
 
529
        # Emit D-Bus signal
 
530
        self.PropertyChanged(dbus.String(u"checker"),
 
531
                             dbus.String(self.checker_command,
 
532
                                         variant_level=1))
 
533
    
 
534
    # SetHost - method
 
535
    @dbus.service.method(_interface, in_signature="s")
 
536
    def SetHost(self, host):
 
537
        "D-Bus setter method"
 
538
        self.host = host
 
539
        # Emit D-Bus signal
 
540
        self.PropertyChanged(dbus.String(u"host"),
 
541
                             dbus.String(self.host, variant_level=1))
 
542
    
 
543
    # SetInterval - method
 
544
    @dbus.service.method(_interface, in_signature="t")
 
545
    def SetInterval(self, milliseconds):
 
546
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
 
547
        # Emit D-Bus signal
 
548
        self.PropertyChanged(dbus.String(u"interval"),
 
549
                             (dbus.UInt64(self.interval_milliseconds(),
 
550
                                          variant_level=1)))
 
551
    
 
552
    # SetSecret - method
 
553
    @dbus.service.method(_interface, in_signature="ay",
 
554
                         byte_arrays=True)
 
555
    def SetSecret(self, secret):
 
556
        "D-Bus setter method"
 
557
        self.secret = str(secret)
 
558
    
 
559
    # SetTimeout - method
 
560
    @dbus.service.method(_interface, in_signature="t")
 
561
    def SetTimeout(self, milliseconds):
 
562
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
 
563
        # Emit D-Bus signal
 
564
        self.PropertyChanged(dbus.String(u"timeout"),
 
565
                             (dbus.UInt64(self.timeout_milliseconds(),
 
566
                                          variant_level=1)))
 
567
    
 
568
    # Enable - method
 
569
    Enable = dbus.service.method(_interface)(enable)
 
570
    Enable.__name__ = "Enable"
 
571
    
 
572
    # StartChecker - method
 
573
    @dbus.service.method(_interface)
 
574
    def StartChecker(self):
 
575
        "D-Bus method"
 
576
        self.start_checker()
 
577
    
 
578
    # Disable - method
 
579
    @dbus.service.method(_interface)
 
580
    def Disable(self):
 
581
        "D-Bus method"
 
582
        self.disable()
 
583
    
 
584
    # StopChecker - method
 
585
    StopChecker = dbus.service.method(_interface)(stop_checker)
 
586
    StopChecker.__name__ = "StopChecker"
 
587
    
 
588
    del _interface
378
589
 
379
590
 
380
591
def peer_certificate(session):
381
592
    "Return the peer's OpenPGP certificate as a bytestring"
382
593
    # If not an OpenPGP certificate...
383
 
    if gnutls.library.functions.gnutls_certificate_type_get\
384
 
            (session._c_object) \
385
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
594
    if (gnutls.library.functions
 
595
        .gnutls_certificate_type_get(session._c_object)
 
596
        != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
386
597
        # ...do the normal thing
387
598
        return session.peer_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))
 
599
    list_size = ctypes.c_uint(1)
 
600
    cert_list = (gnutls.library.functions
 
601
                 .gnutls_certificate_get_peers
 
602
                 (session._c_object, ctypes.byref(list_size)))
 
603
    if not bool(cert_list) and list_size.value != 0:
 
604
        raise gnutls.errors.GNUTLSError("error getting peer"
 
605
                                        " certificate")
391
606
    if list_size.value == 0:
392
607
        return None
393
608
    cert = cert_list[0]
396
611
 
397
612
def fingerprint(openpgp):
398
613
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
 
614
    # New GnuTLS "datum" with the OpenPGP public key
 
615
    datum = (gnutls.library.types
 
616
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
617
                                         ctypes.POINTER
 
618
                                         (ctypes.c_ubyte)),
 
619
                             ctypes.c_uint(len(openpgp))))
399
620
    # New empty GnuTLS certificate
400
621
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
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)))
 
622
    (gnutls.library.functions
 
623
     .gnutls_openpgp_crt_init(ctypes.byref(crt)))
408
624
    # Import the OpenPGP public key into the certificate
409
 
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
410
 
        (crt,
411
 
         ctypes.byref(datum),
412
 
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
625
    (gnutls.library.functions
 
626
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
627
                                gnutls.library.constants
 
628
                                .GNUTLS_OPENPGP_FMT_RAW))
 
629
    # Verify the self signature in the key
 
630
    crtverify = ctypes.c_uint()
 
631
    (gnutls.library.functions
 
632
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
 
633
    if crtverify.value != 0:
 
634
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
635
        raise gnutls.errors.CertificateSecurityError("Verify failed")
413
636
    # New buffer for the fingerprint
414
 
    buffer = ctypes.create_string_buffer(20)
415
 
    buffer_length = ctypes.c_size_t()
 
637
    buf = ctypes.create_string_buffer(20)
 
638
    buf_len = ctypes.c_size_t()
416
639
    # Get the fingerprint from the certificate into the buffer
417
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
418
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
640
    (gnutls.library.functions
 
641
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
642
                                         ctypes.byref(buf_len)))
419
643
    # Deinit the certificate
420
644
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
421
645
    # Convert the buffer to a Python bytestring
422
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
646
    fpr = ctypes.string_at(buf, buf_len.value)
423
647
    # Convert the bytestring to hexadecimal notation
424
648
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
425
649
    return hex_fpr
426
650
 
427
651
 
428
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
652
class TCP_handler(SocketServer.BaseRequestHandler, object):
429
653
    """A TCP request handler class.
430
654
    Instantiated by IPv6_TCPServer for each request to handle it.
431
655
    Note: This will run in its own forked process."""
432
656
    
433
657
    def handle(self):
434
 
        logger.debug(u"TCP connection from: %s",
435
 
                     unicode(self.client_address))
436
 
 
 
658
        logger.info(u"TCP connection from: %s",
 
659
                    unicode(self.client_address))
 
660
        session = (gnutls.connection
 
661
                   .ClientSession(self.request,
 
662
                                  gnutls.connection
 
663
                                  .X509Credentials()))
 
664
        
437
665
        line = self.request.makefile().readline()
438
666
        logger.debug(u"Protocol version: %r", line)
439
667
        try:
443
671
            logger.error(u"Unknown protocol version: %s", error)
444
672
            return
445
673
        
446
 
        session = gnutls.connection.ClientSession\
447
 
                  (self.request, gnutls.connection.X509Credentials())
448
674
        # Note: gnutls.connection.X509Credentials is really a generic
449
675
        # GnuTLS certificate credentials object so long as no X.509
450
676
        # keys are added to it.  Therefore, we can use it here despite
451
677
        # using OpenPGP certificates.
452
678
        
453
679
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
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);
 
680
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
681
        #                     "+DHE-DSS"))
 
682
        # Use a fallback default, since this MUST be set.
 
683
        priority = self.server.settings.get("priority", "NORMAL")
 
684
        (gnutls.library.functions
 
685
         .gnutls_priority_set_direct(session._c_object,
 
686
                                     priority, None))
462
687
        
463
688
        try:
464
689
            session.handshake()
465
690
        except gnutls.errors.GNUTLSError, error:
466
 
            logger.debug(u"Handshake failed: %s", error)
 
691
            logger.warning(u"Handshake failed: %s", error)
467
692
            # Do not run session.bye() here: the session is not
468
693
            # established.  Just abandon the request.
469
694
            return
 
695
        logger.debug(u"Handshake succeeded")
470
696
        try:
471
697
            fpr = fingerprint(peer_certificate(session))
472
698
        except (TypeError, gnutls.errors.GNUTLSError), error:
473
 
            logger.debug(u"Bad certificate: %s", error)
 
699
            logger.warning(u"Bad certificate: %s", error)
474
700
            session.bye()
475
701
            return
476
702
        logger.debug(u"Fingerprint: %s", fpr)
477
 
        client = None
 
703
        
478
704
        for c in self.server.clients:
479
705
            if c.fingerprint == fpr:
480
706
                client = c
481
707
                break
482
 
        if not client:
483
 
            logger.debug(u"Client not found for fingerprint: %s", fpr)
 
708
        else:
 
709
            logger.warning(u"Client not found for fingerprint: %s",
 
710
                           fpr)
484
711
            session.bye()
485
712
            return
486
713
        # Have to check if client.still_valid(), since it is possible
487
714
        # that the client timed out while establishing the GnuTLS
488
715
        # session.
489
716
        if not client.still_valid():
490
 
            logger.debug(u"Client %(name)s is invalid", vars(client))
 
717
            logger.warning(u"Client %(name)s is invalid",
 
718
                           vars(client))
491
719
            session.bye()
492
720
            return
 
721
        ## This won't work here, since we're in a fork.
 
722
        # client.checked_ok()
493
723
        sent_size = 0
494
724
        while sent_size < len(client.secret):
495
725
            sent = session.send(client.secret[sent_size:])
500
730
        session.bye()
501
731
 
502
732
 
503
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
733
class IPv6_TCPServer(SocketServer.ForkingMixIn,
 
734
                     SocketServer.TCPServer, object):
504
735
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
505
736
    Attributes:
506
737
        settings:       Server settings
507
738
        clients:        Set() of Client objects
 
739
        enabled:        Boolean; whether this server is activated yet
508
740
    """
509
741
    address_family = socket.AF_INET6
510
742
    def __init__(self, *args, **kwargs):
514
746
        if "clients" in kwargs:
515
747
            self.clients = kwargs["clients"]
516
748
            del kwargs["clients"]
517
 
        return super(type(self), self).__init__(*args, **kwargs)
 
749
        self.enabled = False
 
750
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
518
751
    def server_bind(self):
519
752
        """This overrides the normal server_bind() function
520
753
        to bind to an interface if one was specified, and also NOT to
528
761
                                       self.settings["interface"])
529
762
            except socket.error, error:
530
763
                if error[0] == errno.EPERM:
531
 
                    logger.warning(u"No permission to"
532
 
                                   u" bind to interface %s",
533
 
                                   self.settings["interface"])
 
764
                    logger.error(u"No permission to"
 
765
                                 u" bind to interface %s",
 
766
                                 self.settings["interface"])
534
767
                else:
535
 
                    raise error
 
768
                    raise
536
769
        # Only bind(2) the socket if we really need to.
537
770
        if self.server_address[0] or self.server_address[1]:
538
771
            if not self.server_address[0]:
539
772
                in6addr_any = "::"
540
773
                self.server_address = (in6addr_any,
541
774
                                       self.server_address[1])
542
 
            elif self.server_address[1] is None:
 
775
            elif not self.server_address[1]:
543
776
                self.server_address = (self.server_address[0],
544
777
                                       0)
545
 
            return super(type(self), self).server_bind()
 
778
#                 if self.settings["interface"]:
 
779
#                     self.server_address = (self.server_address[0],
 
780
#                                            0, # port
 
781
#                                            0, # flowinfo
 
782
#                                            if_nametoindex
 
783
#                                            (self.settings
 
784
#                                             ["interface"]))
 
785
            return super(IPv6_TCPServer, self).server_bind()
 
786
    def server_activate(self):
 
787
        if self.enabled:
 
788
            return super(IPv6_TCPServer, self).server_activate()
 
789
    def enable(self):
 
790
        self.enabled = True
546
791
 
547
792
 
548
793
def string_to_delta(interval):
549
794
    """Parse a string and return a datetime.timedelta
550
 
 
 
795
    
551
796
    >>> string_to_delta('7d')
552
797
    datetime.timedelta(7)
553
798
    >>> string_to_delta('60s')
558
803
    datetime.timedelta(1)
559
804
    >>> string_to_delta(u'1w')
560
805
    datetime.timedelta(7)
 
806
    >>> string_to_delta('5m 30s')
 
807
    datetime.timedelta(0, 330)
561
808
    """
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:
 
809
    timevalue = datetime.timedelta(0)
 
810
    for s in interval.split():
 
811
        try:
 
812
            suffix = unicode(s[-1])
 
813
            value = int(s[:-1])
 
814
            if suffix == u"d":
 
815
                delta = datetime.timedelta(value)
 
816
            elif suffix == u"s":
 
817
                delta = datetime.timedelta(0, value)
 
818
            elif suffix == u"m":
 
819
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
820
            elif suffix == u"h":
 
821
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
822
            elif suffix == u"w":
 
823
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
824
            else:
 
825
                raise ValueError
 
826
        except (ValueError, IndexError):
576
827
            raise ValueError
577
 
    except (ValueError, IndexError):
578
 
        raise ValueError
579
 
    return delta
 
828
        timevalue += delta
 
829
    return timevalue
580
830
 
581
831
 
582
832
def server_state_changed(state):
583
833
    """Derived from the Avahi example code"""
584
834
    if state == avahi.SERVER_COLLISION:
585
 
        logger.warning(u"Server name collision")
 
835
        logger.error(u"Zeroconf server name collision")
586
836
        service.remove()
587
837
    elif state == avahi.SERVER_RUNNING:
588
838
        service.add()
590
840
 
591
841
def entry_group_state_changed(state, error):
592
842
    """Derived from the Avahi example code"""
593
 
    logger.debug(u"state change: %i", state)
 
843
    logger.debug(u"Avahi state change: %i", state)
594
844
    
595
845
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
596
 
        logger.debug(u"Service established.")
 
846
        logger.debug(u"Zeroconf service established.")
597
847
    elif state == avahi.ENTRY_GROUP_COLLISION:
598
 
        logger.warning(u"Service name collision.")
 
848
        logger.warning(u"Zeroconf service name collision.")
599
849
        service.rename()
600
850
    elif state == avahi.ENTRY_GROUP_FAILURE:
601
 
        logger.critical(u"Error in group state changed %s",
 
851
        logger.critical(u"Avahi: Error in group state changed %s",
602
852
                        unicode(error))
603
 
        raise AvahiGroupError("State changed: %s", str(error))
 
853
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
604
854
 
605
855
def if_nametoindex(interface):
606
856
    """Call the C function if_nametoindex(), or equivalent"""
607
857
    global if_nametoindex
608
858
    try:
609
 
        if "ctypes.util" not in sys.modules:
610
 
            import ctypes.util
611
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
612
 
            (ctypes.util.find_library("c")).if_nametoindex
 
859
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
860
                          (ctypes.util.find_library("c"))
 
861
                          .if_nametoindex)
613
862
    except (OSError, AttributeError):
614
863
        if "struct" not in sys.modules:
615
864
            import struct
618
867
        def if_nametoindex(interface):
619
868
            "Get an interface index the hard way, i.e. using fcntl()"
620
869
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
621
 
            s = socket.socket()
622
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
623
 
                                struct.pack("16s16x", interface))
624
 
            s.close()
 
870
            with closing(socket.socket()) as s:
 
871
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
872
                                    struct.pack("16s16x", interface))
625
873
            interface_index = struct.unpack("I", ifreq[16:20])[0]
626
874
            return interface_index
627
875
    return if_nametoindex(interface)
628
876
 
629
877
 
630
 
def daemon(nochdir, noclose):
 
878
def daemon(nochdir = False, noclose = False):
631
879
    """See daemon(3).  Standard BSD Unix function.
632
880
    This should really exist as os.daemon, but it doesn't (yet)."""
633
881
    if os.fork():
635
883
    os.setsid()
636
884
    if not nochdir:
637
885
        os.chdir("/")
 
886
    if os.fork():
 
887
        sys.exit()
638
888
    if not noclose:
639
889
        # Close all standard open file descriptors
640
890
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
649
899
 
650
900
 
651
901
def main():
652
 
    global main_loop_started
653
 
    main_loop_started = False
654
 
    
655
 
    parser = OptionParser()
 
902
    parser = optparse.OptionParser(version = "%%prog %s" % version)
656
903
    parser.add_option("-i", "--interface", type="string",
657
904
                      metavar="IF", help="Bind to interface IF")
658
905
    parser.add_option("-a", "--address", type="string",
659
906
                      help="Address to listen for requests on")
660
907
    parser.add_option("-p", "--port", type="int",
661
908
                      help="Port number to receive requests on")
662
 
    parser.add_option("--check", action="store_true", default=False,
 
909
    parser.add_option("--check", action="store_true",
663
910
                      help="Run self-test")
664
 
    parser.add_option("--debug", action="store_true", default=False,
 
911
    parser.add_option("--debug", action="store_true",
665
912
                      help="Debug mode; run in foreground and log to"
666
913
                      " terminal")
667
914
    parser.add_option("--priority", type="string", help="GnuTLS"
672
919
                      default="/etc/mandos", metavar="DIR",
673
920
                      help="Directory to search for configuration"
674
921
                      " files")
675
 
    (options, args) = parser.parse_args()
 
922
    parser.add_option("--no-dbus", action="store_false",
 
923
                      dest="use_dbus",
 
924
                      help="Do not provide D-Bus system bus"
 
925
                      " interface")
 
926
    options = parser.parse_args()[0]
676
927
    
677
928
    if options.check:
678
929
        import doctest
687
938
                        "priority":
688
939
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
689
940
                        "servicename": "Mandos",
 
941
                        "use_dbus": "True",
690
942
                        }
691
943
    
692
944
    # Parse config file for server-global settings
693
945
    server_config = ConfigParser.SafeConfigParser(server_defaults)
694
946
    del server_defaults
695
 
    server_config.read(os.path.join(options.configdir, "server.conf"))
696
 
    server_section = "server"
 
947
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
697
948
    # Convert the SafeConfigParser object to a dict
698
 
    server_settings = dict(server_config.items(server_section))
699
 
    # Use getboolean on the boolean config option
700
 
    server_settings["debug"] = server_config.getboolean\
701
 
                               (server_section, "debug")
 
949
    server_settings = server_config.defaults()
 
950
    # Use the appropriate methods on the non-string config options
 
951
    server_settings["debug"] = server_config.getboolean("DEFAULT",
 
952
                                                        "debug")
 
953
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
 
954
                                                           "use_dbus")
 
955
    if server_settings["port"]:
 
956
        server_settings["port"] = server_config.getint("DEFAULT",
 
957
                                                       "port")
702
958
    del server_config
703
959
    
704
960
    # Override the settings from the config file with command line
705
961
    # options, if set.
706
962
    for option in ("interface", "address", "port", "debug",
707
 
                   "priority", "servicename", "configdir"):
 
963
                   "priority", "servicename", "configdir",
 
964
                   "use_dbus"):
708
965
        value = getattr(options, option)
709
966
        if value is not None:
710
967
            server_settings[option] = value
711
968
    del options
712
969
    # Now we have our good server settings in "server_settings"
713
970
    
 
971
    # For convenience
 
972
    debug = server_settings["debug"]
 
973
    use_dbus = server_settings["use_dbus"]
 
974
    
 
975
    if not debug:
 
976
        syslogger.setLevel(logging.WARNING)
 
977
        console.setLevel(logging.WARNING)
 
978
    
 
979
    if server_settings["servicename"] != "Mandos":
 
980
        syslogger.setFormatter(logging.Formatter
 
981
                               ('Mandos (%s): %%(levelname)s:'
 
982
                                ' %%(message)s'
 
983
                                % server_settings["servicename"]))
 
984
    
714
985
    # Parse config file with clients
715
986
    client_defaults = { "timeout": "1h",
716
987
                        "interval": "5m",
717
 
                        "checker": "fping -q -- %%(fqdn)s",
 
988
                        "checker": "fping -q -- %%(host)s",
 
989
                        "host": "",
718
990
                        }
719
991
    client_config = ConfigParser.SafeConfigParser(client_defaults)
720
992
    client_config.read(os.path.join(server_settings["configdir"],
721
993
                                    "clients.conf"))
722
994
    
 
995
    clients = Set()
 
996
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
997
                                 server_settings["port"]),
 
998
                                TCP_handler,
 
999
                                settings=server_settings,
 
1000
                                clients=clients)
 
1001
    pidfilename = "/var/run/mandos.pid"
 
1002
    try:
 
1003
        pidfile = open(pidfilename, "w")
 
1004
    except IOError:
 
1005
        logger.error("Could not open file %r", pidfilename)
 
1006
    
 
1007
    try:
 
1008
        uid = pwd.getpwnam("_mandos").pw_uid
 
1009
        gid = pwd.getpwnam("_mandos").pw_gid
 
1010
    except KeyError:
 
1011
        try:
 
1012
            uid = pwd.getpwnam("mandos").pw_uid
 
1013
            gid = pwd.getpwnam("mandos").pw_gid
 
1014
        except KeyError:
 
1015
            try:
 
1016
                uid = pwd.getpwnam("nobody").pw_uid
 
1017
                gid = pwd.getpwnam("nogroup").pw_gid
 
1018
            except KeyError:
 
1019
                uid = 65534
 
1020
                gid = 65534
 
1021
    try:
 
1022
        os.setgid(gid)
 
1023
        os.setuid(uid)
 
1024
    except OSError, error:
 
1025
        if error[0] != errno.EPERM:
 
1026
            raise error
 
1027
    
 
1028
    # Enable all possible GnuTLS debugging
 
1029
    if debug:
 
1030
        # "Use a log level over 10 to enable all debugging options."
 
1031
        # - GnuTLS manual
 
1032
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1033
        
 
1034
        @gnutls.library.types.gnutls_log_func
 
1035
        def debug_gnutls(level, string):
 
1036
            logger.debug("GnuTLS: %s", string[:-1])
 
1037
        
 
1038
        (gnutls.library.functions
 
1039
         .gnutls_global_set_log_function(debug_gnutls))
 
1040
    
723
1041
    global service
724
1042
    service = AvahiService(name = server_settings["servicename"],
725
 
                           type = "_mandos._tcp", );
 
1043
                           servicetype = "_mandos._tcp", )
726
1044
    if server_settings["interface"]:
727
 
        service.interface = if_nametoindex(server_settings["interface"])
 
1045
        service.interface = (if_nametoindex
 
1046
                             (server_settings["interface"]))
728
1047
    
729
1048
    global main_loop
730
1049
    global bus
733
1052
    DBusGMainLoop(set_as_default=True )
734
1053
    main_loop = gobject.MainLoop()
735
1054
    bus = dbus.SystemBus()
736
 
    server = dbus.Interface(
737
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
738
 
            avahi.DBUS_INTERFACE_SERVER )
 
1055
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
 
1056
                                           avahi.DBUS_PATH_SERVER),
 
1057
                            avahi.DBUS_INTERFACE_SERVER)
739
1058
    # End of Avahi example code
740
 
    
741
 
    debug = server_settings["debug"]
742
 
    
743
 
    if debug:
744
 
        console = logging.StreamHandler()
745
 
        # console.setLevel(logging.DEBUG)
746
 
        console.setFormatter(logging.Formatter\
747
 
                             ('%(levelname)s: %(message)s'))
748
 
        logger.addHandler(console)
749
 
        del console
750
 
    
751
 
    clients = Set()
752
 
    def remove_from_clients(client):
753
 
        clients.remove(client)
754
 
        if not clients:
755
 
            logger.debug(u"No clients left, exiting")
756
 
            sys.exit()
757
 
    
758
 
    clients.update(Set(Client(name=section,
759
 
                              stop_hook = remove_from_clients,
760
 
                              **(dict(client_config\
761
 
                                      .items(section))))
 
1059
    if use_dbus:
 
1060
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
 
1061
    
 
1062
    clients.update(Set(Client(name = section,
 
1063
                              config
 
1064
                              = dict(client_config.items(section)),
 
1065
                              use_dbus = use_dbus)
762
1066
                       for section in client_config.sections()))
763
 
    
764
 
    if not debug:
765
 
        daemon(False, False)
 
1067
    if not clients:
 
1068
        logger.warning(u"No clients defined")
 
1069
    
 
1070
    if debug:
 
1071
        # Redirect stdin so all checkers get /dev/null
 
1072
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1073
        os.dup2(null, sys.stdin.fileno())
 
1074
        if null > 2:
 
1075
            os.close(null)
 
1076
    else:
 
1077
        # No console logging
 
1078
        logger.removeHandler(console)
 
1079
        # Close all input and output, do double fork, etc.
 
1080
        daemon()
 
1081
    
 
1082
    try:
 
1083
        pid = os.getpid()
 
1084
        pidfile.write(str(pid) + "\n")
 
1085
        pidfile.close()
 
1086
        del pidfile
 
1087
    except IOError:
 
1088
        logger.error(u"Could not write to file %r with PID %d",
 
1089
                     pidfilename, pid)
 
1090
    except NameError:
 
1091
        # "pidfile" was never created
 
1092
        pass
 
1093
    del pidfilename
766
1094
    
767
1095
    def cleanup():
768
1096
        "Cleanup function; run on exit"
775
1103
        
776
1104
        while clients:
777
1105
            client = clients.pop()
778
 
            client.stop_hook = None
779
 
            client.stop()
 
1106
            client.disable_hook = None
 
1107
            client.disable()
780
1108
    
781
1109
    atexit.register(cleanup)
782
1110
    
785
1113
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
786
1114
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
787
1115
    
 
1116
    if use_dbus:
 
1117
        class MandosServer(dbus.service.Object):
 
1118
            """A D-Bus proxy object"""
 
1119
            def __init__(self):
 
1120
                dbus.service.Object.__init__(self, bus, "/")
 
1121
            _interface = u"se.bsnet.fukt.Mandos"
 
1122
            
 
1123
            @dbus.service.signal(_interface, signature="oa{sv}")
 
1124
            def ClientAdded(self, objpath, properties):
 
1125
                "D-Bus signal"
 
1126
                pass
 
1127
            
 
1128
            @dbus.service.signal(_interface, signature="os")
 
1129
            def ClientRemoved(self, objpath, name):
 
1130
                "D-Bus signal"
 
1131
                pass
 
1132
            
 
1133
            @dbus.service.method(_interface, out_signature="ao")
 
1134
            def GetAllClients(self):
 
1135
                "D-Bus method"
 
1136
                return dbus.Array(c.dbus_object_path for c in clients)
 
1137
            
 
1138
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
 
1139
            def GetAllClientsWithProperties(self):
 
1140
                "D-Bus method"
 
1141
                return dbus.Dictionary(
 
1142
                    ((c.dbus_object_path, c.GetAllProperties())
 
1143
                     for c in clients),
 
1144
                    signature="oa{sv}")
 
1145
            
 
1146
            @dbus.service.method(_interface, in_signature="o")
 
1147
            def RemoveClient(self, object_path):
 
1148
                "D-Bus method"
 
1149
                for c in clients:
 
1150
                    if c.dbus_object_path == object_path:
 
1151
                        clients.remove(c)
 
1152
                        # Don't signal anything except ClientRemoved
 
1153
                        c.use_dbus = False
 
1154
                        c.disable()
 
1155
                        # Emit D-Bus signal
 
1156
                        self.ClientRemoved(object_path, c.name)
 
1157
                        return
 
1158
                raise KeyError
 
1159
            
 
1160
            del _interface
 
1161
        
 
1162
        mandos_server = MandosServer()
 
1163
    
788
1164
    for client in clients:
789
 
        client.start()
790
 
    
791
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
792
 
                                 server_settings["port"]),
793
 
                                tcp_handler,
794
 
                                settings=server_settings,
795
 
                                clients=clients)
 
1165
        if use_dbus:
 
1166
            # Emit D-Bus signal
 
1167
            mandos_server.ClientAdded(client.dbus_object_path,
 
1168
                                      client.GetAllProperties())
 
1169
        client.enable()
 
1170
    
 
1171
    tcp_server.enable()
 
1172
    tcp_server.server_activate()
 
1173
    
796
1174
    # Find out what port we got
797
1175
    service.port = tcp_server.socket.getsockname()[1]
798
 
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
799
 
                 u" scope_id %d" % tcp_server.socket.getsockname())
 
1176
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
 
1177
                u" scope_id %d" % tcp_server.socket.getsockname())
800
1178
    
801
1179
    #service.interface = tcp_server.socket.getsockname()[3]
802
1180
    
812
1190
        
813
1191
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
814
1192
                             lambda *args, **kwargs:
815
 
                             tcp_server.handle_request\
816
 
                             (*args[2:], **kwargs) or True)
 
1193
                             (tcp_server.handle_request
 
1194
                              (*args[2:], **kwargs) or True))
817
1195
        
818
 
        logger.debug("Starting main loop")
819
 
        main_loop_started = True
 
1196
        logger.debug(u"Starting main loop")
820
1197
        main_loop.run()
821
1198
    except AvahiError, error:
822
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
1199
        logger.critical(u"AvahiError: %s", error)
823
1200
        sys.exit(1)
824
1201
    except KeyboardInterrupt:
825
1202
        if debug:
826
 
            print
 
1203
            print >> sys.stderr
 
1204
        logger.debug("Server received KeyboardInterrupt")
 
1205
    logger.debug("Server exiting")
827
1206
 
828
1207
if __name__ == '__main__':
829
1208
    main()