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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
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# it under the terms of the GNU General Public License as published by
25
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#     GNU General Public License for more details.
26
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# 
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
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# 
31
29
# Contact the authors at <mandos@fukt.bsnet.se>.
32
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# 
33
31
 
34
 
from __future__ import division, with_statement, absolute_import
 
32
from __future__ import division
35
33
 
36
34
import SocketServer
37
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import socket
38
 
import optparse
 
36
import select
 
37
from optparse import OptionParser
39
38
import datetime
40
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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):
 
115
                 type = None, port = None, TXT = None, domain = "",
 
116
                 host = "", max_renames = 12):
 
117
        """An Avahi (Zeroconf) service. """
118
118
        self.interface = interface
119
119
        self.name = name
120
 
        self.type = servicetype
 
120
        self.type = type
121
121
        self.port = port
122
 
        self.TXT = TXT if TXT is not None else []
 
122
        if TXT is None:
 
123
            self.TXT = []
 
124
        else:
 
125
            self.TXT = TXT
123
126
        self.domain = domain
124
127
        self.host = host
125
128
        self.rename_count = 0
126
 
        self.max_renames = max_renames
127
129
    def rename(self):
128
130
        """Derived from the Avahi example code"""
129
131
        if self.rename_count >= self.max_renames:
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))
 
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)
140
137
        self.remove()
141
138
        self.add()
142
139
        self.rename_count += 1
148
145
        """Derived from the Avahi example code"""
149
146
        global group
150
147
        if group is None:
151
 
            group = dbus.Interface(bus.get_object
152
 
                                   (avahi.DBUS_NAME,
 
148
            group = dbus.Interface\
 
149
                    (bus.get_object(avahi.DBUS_NAME,
153
150
                                    server.EntryGroupNew()),
154
 
                                   avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
151
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
155
152
            group.connect_to_signal('StateChanged',
156
153
                                    entry_group_state_changed)
157
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
154
        logger.debug(u"Adding service '%s' of type '%s' ...",
158
155
                     service.name, service.type)
159
156
        group.AddService(
160
157
                self.interface,         # interface
171
168
# End of Avahi example code
172
169
 
173
170
 
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):
 
171
class Client(object):
180
172
    """A representation of a client host served by this server.
181
173
    Attributes:
182
 
    name:       string; from the config file, used in log messages and
183
 
                        D-Bus identifiers
 
174
    name:      string; from the config file, used in log messages
184
175
    fingerprint: string (40 or 32 hexadecimal digits); used to
185
176
                 uniquely identify the client
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.
 
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.
199
188
    checker_initiator_tag: a gobject event source tag, or None
200
 
    disable_initiator_tag:    - '' -
 
189
    stop_initiator_tag:    - '' -
201
190
    checker_callback_tag:  - '' -
202
191
    checker_command: string; External command which is run to check if
203
192
                     client lives.  %() expansions are done at
204
193
                     runtime with vars(self) as dict, so that for
205
194
                     instance %(name)s can be used in the command.
206
 
    use_dbus: bool(); Whether to provide D-Bus interface and signals
207
 
    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: - '' -
208
200
    """
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."""
 
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.."""
226
229
        self.name = name
227
 
        if config is None:
228
 
            config = {}
229
230
        logger.debug(u"Creating client %r", self.name)
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""))
 
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"")
236
235
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
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()
 
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()
244
242
        else:
245
243
            raise TypeError(u"No secret or secfile for client %s"
246
244
                            % self.name)
247
 
        self.host = config.get("host", "")
248
 
        self.created = datetime.datetime.utcnow()
249
 
        self.enabled = False
250
 
        self.last_enabled = None
 
245
        self.fqdn = fqdn
 
246
        self.created = datetime.datetime.now()
251
247
        self.last_checked_ok = None
252
 
        self.timeout = string_to_delta(config["timeout"])
253
 
        self.interval = string_to_delta(config["interval"])
254
 
        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
255
251
        self.checker = None
256
252
        self.checker_initiator_tag = None
257
 
        self.disable_initiator_tag = None
 
253
        self.stop_initiator_tag = None
258
254
        self.checker_callback_tag = None
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):
 
255
        self.check_command = checker
 
256
    def start(self):
272
257
        """Start this client's checker and timeout hooks"""
273
 
        self.last_enabled = datetime.datetime.utcnow()
274
258
        # Schedule a new checker to be started an 'interval' from now,
275
259
        # and every interval from then on.
276
 
        self.checker_initiator_tag = (gobject.timeout_add
277
 
                                      (self.interval_milliseconds(),
278
 
                                       self.start_checker))
 
260
        self.checker_initiator_tag = gobject.timeout_add\
 
261
                                     (self._interval_milliseconds,
 
262
                                      self.start_checker)
279
263
        # Also start a new checker *right now*.
280
264
        self.start_checker()
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):
 
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:
297
278
            return False
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
 
279
        if getattr(self, "stop_initiator_tag", False):
 
280
            gobject.source_remove(self.stop_initiator_tag)
 
281
            self.stop_initiator_tag = None
302
282
        if getattr(self, "checker_initiator_tag", False):
303
283
            gobject.source_remove(self.checker_initiator_tag)
304
284
            self.checker_initiator_tag = None
305
285
        self.stop_checker()
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))
 
286
        if self.stop_hook:
 
287
            self.stop_hook(self)
313
288
        # Do not run this again if called by a gobject.timeout_add
314
289
        return False
315
 
    
316
290
    def __del__(self):
317
 
        self.disable_hook = None
318
 
        self.disable()
319
 
    
320
 
    def checker_callback(self, pid, condition, command):
 
291
        self.stop_hook = None
 
292
        self.stop()
 
293
    def checker_callback(self, pid, condition):
321
294
        """The checker has completed, so take appropriate actions."""
 
295
        now = datetime.datetime.now()
322
296
        self.checker_callback_tag = None
323
297
        self.checker = None
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:
 
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):
343
308
            logger.warning(u"Checker for %(name)s crashed?",
344
309
                           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
 
    
 
310
        else:
 
311
            logger.debug(u"Checker for %(name)s failed",
 
312
                         vars(self))
368
313
    def start_checker(self):
369
314
        """Start a new checker subprocess if one is not running.
370
315
        If a checker already exists, leave it running and do
379
324
        # is as it should be.
380
325
        if self.checker is None:
381
326
            try:
382
 
                # In case checker_command has exactly one % operator
383
 
                command = self.checker_command % self.host
 
327
                # In case check_command has exactly one % operator
 
328
                command = self.check_command % self.fqdn
384
329
            except TypeError:
385
330
                # Escape attributes for the shell
386
331
                escaped_attrs = dict((key, re.escape(str(val)))
387
332
                                     for key, val in
388
333
                                     vars(self).iteritems())
389
334
                try:
390
 
                    command = self.checker_command % escaped_attrs
 
335
                    command = self.check_command % escaped_attrs
391
336
                except TypeError, error:
392
337
                    logger.error(u'Could not format string "%s":'
393
 
                                 u' %s', self.checker_command, error)
 
338
                                 u' %s', self.check_command, error)
394
339
                    return True # Try again later
395
340
            try:
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.)
 
341
                logger.debug(u"Starting checker %r for %s",
 
342
                             command, self.name)
402
343
                self.checker = subprocess.Popen(command,
403
344
                                                close_fds=True,
404
345
                                                shell=True, cwd="/")
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
 
                # The checker may have completed before the gobject
416
 
                # watch was added.  Check for this.
417
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
418
 
                if pid:
419
 
                    gobject.source_remove(self.checker_callback_tag)
420
 
                    self.checker_callback(pid, status, command)
421
 
            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:
422
350
                logger.error(u"Failed to start subprocess: %s",
423
351
                             error)
424
352
        # Re-run this periodically if run by gobject.timeout_add
425
353
        return True
426
 
    
427
354
    def stop_checker(self):
428
355
        """Force the checker process, if any, to stop."""
429
356
        if self.checker_callback_tag:
431
358
            self.checker_callback_tag = None
432
359
        if getattr(self, "checker", None) is None:
433
360
            return
434
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
361
        logger.debug("Stopping checker for %(name)s", vars(self))
435
362
        try:
436
363
            os.kill(self.checker.pid, signal.SIGTERM)
437
364
            #os.sleep(0.5)
441
368
            if error.errno != errno.ESRCH: # No such process
442
369
                raise
443
370
        self.checker = None
444
 
        if self.use_dbus:
445
 
            self.PropertyChanged(dbus.String(u"checker_running"),
446
 
                                 dbus.Boolean(False, variant_level=1))
447
 
    
448
371
    def still_valid(self):
449
372
        """Has the timeout not yet passed for this client?"""
450
 
        if not getattr(self, "enabled", False):
451
 
            return False
452
 
        now = datetime.datetime.utcnow()
 
373
        now = datetime.datetime.now()
453
374
        if self.last_checked_ok is None:
454
375
            return now < (self.created + self.timeout)
455
376
        else:
456
377
            return now < (self.last_checked_ok + self.timeout)
457
 
    
458
 
    ## D-Bus methods & signals
459
 
    _interface = u"se.bsnet.fukt.Mandos.Client"
460
 
    
461
 
    # CheckedOK - method
462
 
    CheckedOK = dbus.service.method(_interface)(checked_ok)
463
 
    CheckedOK.__name__ = "CheckedOK"
464
 
    
465
 
    # CheckerCompleted - signal
466
 
    @dbus.service.signal(_interface, signature="nxs")
467
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
468
 
        "D-Bus signal"
469
 
        pass
470
 
    
471
 
    # CheckerStarted - signal
472
 
    @dbus.service.signal(_interface, signature="s")
473
 
    def CheckerStarted(self, command):
474
 
        "D-Bus signal"
475
 
        pass
476
 
    
477
 
    # GetAllProperties - method
478
 
    @dbus.service.method(_interface, out_signature="a{sv}")
479
 
    def GetAllProperties(self):
480
 
        "D-Bus method"
481
 
        return dbus.Dictionary({
482
 
                dbus.String("name"):
483
 
                    dbus.String(self.name, variant_level=1),
484
 
                dbus.String("fingerprint"):
485
 
                    dbus.String(self.fingerprint, variant_level=1),
486
 
                dbus.String("host"):
487
 
                    dbus.String(self.host, variant_level=1),
488
 
                dbus.String("created"):
489
 
                    _datetime_to_dbus(self.created, variant_level=1),
490
 
                dbus.String("last_enabled"):
491
 
                    (_datetime_to_dbus(self.last_enabled,
492
 
                                       variant_level=1)
493
 
                     if self.last_enabled is not None
494
 
                     else dbus.Boolean(False, variant_level=1)),
495
 
                dbus.String("enabled"):
496
 
                    dbus.Boolean(self.enabled, variant_level=1),
497
 
                dbus.String("last_checked_ok"):
498
 
                    (_datetime_to_dbus(self.last_checked_ok,
499
 
                                       variant_level=1)
500
 
                     if self.last_checked_ok is not None
501
 
                     else dbus.Boolean (False, variant_level=1)),
502
 
                dbus.String("timeout"):
503
 
                    dbus.UInt64(self.timeout_milliseconds(),
504
 
                                variant_level=1),
505
 
                dbus.String("interval"):
506
 
                    dbus.UInt64(self.interval_milliseconds(),
507
 
                                variant_level=1),
508
 
                dbus.String("checker"):
509
 
                    dbus.String(self.checker_command,
510
 
                                variant_level=1),
511
 
                dbus.String("checker_running"):
512
 
                    dbus.Boolean(self.checker is not None,
513
 
                                 variant_level=1),
514
 
                dbus.String("object_path"):
515
 
                    dbus.ObjectPath(self.dbus_object_path,
516
 
                                    variant_level=1)
517
 
                }, signature="sv")
518
 
    
519
 
    # IsStillValid - method
520
 
    IsStillValid = (dbus.service.method(_interface, out_signature="b")
521
 
                    (still_valid))
522
 
    IsStillValid.__name__ = "IsStillValid"
523
 
    
524
 
    # PropertyChanged - signal
525
 
    @dbus.service.signal(_interface, signature="sv")
526
 
    def PropertyChanged(self, property, value):
527
 
        "D-Bus signal"
528
 
        pass
529
 
    
530
 
    # SetChecker - method
531
 
    @dbus.service.method(_interface, in_signature="s")
532
 
    def SetChecker(self, checker):
533
 
        "D-Bus setter method"
534
 
        self.checker_command = checker
535
 
        # Emit D-Bus signal
536
 
        self.PropertyChanged(dbus.String(u"checker"),
537
 
                             dbus.String(self.checker_command,
538
 
                                         variant_level=1))
539
 
    
540
 
    # SetHost - method
541
 
    @dbus.service.method(_interface, in_signature="s")
542
 
    def SetHost(self, host):
543
 
        "D-Bus setter method"
544
 
        self.host = host
545
 
        # Emit D-Bus signal
546
 
        self.PropertyChanged(dbus.String(u"host"),
547
 
                             dbus.String(self.host, variant_level=1))
548
 
    
549
 
    # SetInterval - method
550
 
    @dbus.service.method(_interface, in_signature="t")
551
 
    def SetInterval(self, milliseconds):
552
 
        self.interval = datetime.timedelta(0, 0, 0, milliseconds)
553
 
        # Emit D-Bus signal
554
 
        self.PropertyChanged(dbus.String(u"interval"),
555
 
                             (dbus.UInt64(self.interval_milliseconds(),
556
 
                                          variant_level=1)))
557
 
    
558
 
    # SetSecret - method
559
 
    @dbus.service.method(_interface, in_signature="ay",
560
 
                         byte_arrays=True)
561
 
    def SetSecret(self, secret):
562
 
        "D-Bus setter method"
563
 
        self.secret = str(secret)
564
 
    
565
 
    # SetTimeout - method
566
 
    @dbus.service.method(_interface, in_signature="t")
567
 
    def SetTimeout(self, milliseconds):
568
 
        self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
569
 
        # Emit D-Bus signal
570
 
        self.PropertyChanged(dbus.String(u"timeout"),
571
 
                             (dbus.UInt64(self.timeout_milliseconds(),
572
 
                                          variant_level=1)))
573
 
    
574
 
    # Enable - method
575
 
    Enable = dbus.service.method(_interface)(enable)
576
 
    Enable.__name__ = "Enable"
577
 
    
578
 
    # StartChecker - method
579
 
    @dbus.service.method(_interface)
580
 
    def StartChecker(self):
581
 
        "D-Bus method"
582
 
        self.start_checker()
583
 
    
584
 
    # Disable - method
585
 
    @dbus.service.method(_interface)
586
 
    def Disable(self):
587
 
        "D-Bus method"
588
 
        self.disable()
589
 
    
590
 
    # StopChecker - method
591
 
    StopChecker = dbus.service.method(_interface)(stop_checker)
592
 
    StopChecker.__name__ = "StopChecker"
593
 
    
594
 
    del _interface
595
378
 
596
379
 
597
380
def peer_certificate(session):
598
381
    "Return the peer's OpenPGP certificate as a bytestring"
599
382
    # If not an OpenPGP certificate...
600
 
    if (gnutls.library.functions
601
 
        .gnutls_certificate_type_get(session._c_object)
602
 
        != 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:
603
386
        # ...do the normal thing
604
387
        return session.peer_certificate
605
 
    list_size = ctypes.c_uint(1)
606
 
    cert_list = (gnutls.library.functions
607
 
                 .gnutls_certificate_get_peers
608
 
                 (session._c_object, ctypes.byref(list_size)))
609
 
    if not bool(cert_list) and list_size.value != 0:
610
 
        raise gnutls.errors.GNUTLSError("error getting peer"
611
 
                                        " 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))
612
391
    if list_size.value == 0:
613
392
        return None
614
393
    cert = cert_list[0]
617
396
 
618
397
def fingerprint(openpgp):
619
398
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
620
 
    # New GnuTLS "datum" with the OpenPGP public key
621
 
    datum = (gnutls.library.types
622
 
             .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
623
 
                                         ctypes.POINTER
624
 
                                         (ctypes.c_ubyte)),
625
 
                             ctypes.c_uint(len(openpgp))))
626
399
    # New empty GnuTLS certificate
627
400
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
628
 
    (gnutls.library.functions
629
 
     .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)))
630
408
    # Import the OpenPGP public key into the certificate
631
 
    (gnutls.library.functions
632
 
     .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
633
 
                                gnutls.library.constants
634
 
                                .GNUTLS_OPENPGP_FMT_RAW))
635
 
    # Verify the self signature in the key
636
 
    crtverify = ctypes.c_uint()
637
 
    (gnutls.library.functions
638
 
     .gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
639
 
    if crtverify.value != 0:
640
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
641
 
        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)
642
413
    # New buffer for the fingerprint
643
 
    buf = ctypes.create_string_buffer(20)
644
 
    buf_len = ctypes.c_size_t()
 
414
    buffer = ctypes.create_string_buffer(20)
 
415
    buffer_length = ctypes.c_size_t()
645
416
    # Get the fingerprint from the certificate into the buffer
646
 
    (gnutls.library.functions
647
 
     .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
648
 
                                         ctypes.byref(buf_len)))
 
417
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
418
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
649
419
    # Deinit the certificate
650
420
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
651
421
    # Convert the buffer to a Python bytestring
652
 
    fpr = ctypes.string_at(buf, buf_len.value)
 
422
    fpr = ctypes.string_at(buffer, buffer_length.value)
653
423
    # Convert the bytestring to hexadecimal notation
654
424
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
655
425
    return hex_fpr
656
426
 
657
427
 
658
 
class TCP_handler(SocketServer.BaseRequestHandler, object):
 
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
659
429
    """A TCP request handler class.
660
430
    Instantiated by IPv6_TCPServer for each request to handle it.
661
431
    Note: This will run in its own forked process."""
662
432
    
663
433
    def handle(self):
664
 
        logger.info(u"TCP connection from: %s",
665
 
                    unicode(self.client_address))
666
 
        session = (gnutls.connection
667
 
                   .ClientSession(self.request,
668
 
                                  gnutls.connection
669
 
                                  .X509Credentials()))
670
 
        
671
 
        line = self.request.makefile().readline()
672
 
        logger.debug(u"Protocol version: %r", line)
 
434
        logger.debug(u"TCP connection from: %s",
 
435
                     unicode(self.client_address))
 
436
 
 
437
        line = self.socket.makefile().readline()
673
438
        try:
674
439
            if int(line.strip().split()[0]) > 1:
675
440
                raise RuntimeError
677
442
            logger.error(u"Unknown protocol version: %s", error)
678
443
            return
679
444
        
 
445
        session = gnutls.connection.ClientSession\
 
446
                  (self.request, gnutls.connection.X509Credentials())
680
447
        # Note: gnutls.connection.X509Credentials is really a generic
681
448
        # GnuTLS certificate credentials object so long as no X.509
682
449
        # keys are added to it.  Therefore, we can use it here despite
683
450
        # using OpenPGP certificates.
684
451
        
685
452
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
686
 
        #                     "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
687
 
        #                     "+DHE-DSS"))
688
 
        # Use a fallback default, since this MUST be set.
689
 
        priority = self.server.settings.get("priority", "NORMAL")
690
 
        (gnutls.library.functions
691
 
         .gnutls_priority_set_direct(session._c_object,
692
 
                                     priority, None))
 
453
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
454
        #                "+DHE-DSS"))
 
455
        priority = "NORMAL"             # Fallback default, since this
 
456
                                        # MUST be set.
 
457
        if self.server.settings["priority"]:
 
458
            priority = self.server.settings["priority"]
 
459
        gnutls.library.functions.gnutls_priority_set_direct\
 
460
            (session._c_object, priority, None);
693
461
        
694
462
        try:
695
463
            session.handshake()
696
464
        except gnutls.errors.GNUTLSError, error:
697
 
            logger.warning(u"Handshake failed: %s", error)
 
465
            logger.debug(u"Handshake failed: %s", error)
698
466
            # Do not run session.bye() here: the session is not
699
467
            # established.  Just abandon the request.
700
468
            return
701
 
        logger.debug(u"Handshake succeeded")
702
469
        try:
703
470
            fpr = fingerprint(peer_certificate(session))
704
471
        except (TypeError, gnutls.errors.GNUTLSError), error:
705
 
            logger.warning(u"Bad certificate: %s", error)
 
472
            logger.debug(u"Bad certificate: %s", error)
706
473
            session.bye()
707
474
            return
708
475
        logger.debug(u"Fingerprint: %s", fpr)
709
 
        
 
476
        client = None
710
477
        for c in self.server.clients:
711
478
            if c.fingerprint == fpr:
712
479
                client = c
713
480
                break
714
 
        else:
715
 
            logger.warning(u"Client not found for fingerprint: %s",
716
 
                           fpr)
 
481
        if not client:
 
482
            logger.debug(u"Client not found for fingerprint: %s", fpr)
717
483
            session.bye()
718
484
            return
719
485
        # Have to check if client.still_valid(), since it is possible
720
486
        # that the client timed out while establishing the GnuTLS
721
487
        # session.
722
488
        if not client.still_valid():
723
 
            logger.warning(u"Client %(name)s is invalid",
724
 
                           vars(client))
 
489
            logger.debug(u"Client %(name)s is invalid", vars(client))
725
490
            session.bye()
726
491
            return
727
 
        ## This won't work here, since we're in a fork.
728
 
        # client.checked_ok()
729
492
        sent_size = 0
730
493
        while sent_size < len(client.secret):
731
494
            sent = session.send(client.secret[sent_size:])
736
499
        session.bye()
737
500
 
738
501
 
739
 
class IPv6_TCPServer(SocketServer.ForkingMixIn,
740
 
                     SocketServer.TCPServer, object):
 
502
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
741
503
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
742
504
    Attributes:
743
505
        settings:       Server settings
744
506
        clients:        Set() of Client objects
745
 
        enabled:        Boolean; whether this server is activated yet
746
507
    """
747
508
    address_family = socket.AF_INET6
748
509
    def __init__(self, *args, **kwargs):
752
513
        if "clients" in kwargs:
753
514
            self.clients = kwargs["clients"]
754
515
            del kwargs["clients"]
755
 
        self.enabled = False
756
 
        super(IPv6_TCPServer, self).__init__(*args, **kwargs)
 
516
        return super(type(self), self).__init__(*args, **kwargs)
757
517
    def server_bind(self):
758
518
        """This overrides the normal server_bind() function
759
519
        to bind to an interface if one was specified, and also NOT to
767
527
                                       self.settings["interface"])
768
528
            except socket.error, error:
769
529
                if error[0] == errno.EPERM:
770
 
                    logger.error(u"No permission to"
771
 
                                 u" bind to interface %s",
772
 
                                 self.settings["interface"])
 
530
                    logger.warning(u"No permission to"
 
531
                                   u" bind to interface %s",
 
532
                                   self.settings["interface"])
773
533
                else:
774
 
                    raise
 
534
                    raise error
775
535
        # Only bind(2) the socket if we really need to.
776
536
        if self.server_address[0] or self.server_address[1]:
777
537
            if not self.server_address[0]:
778
538
                in6addr_any = "::"
779
539
                self.server_address = (in6addr_any,
780
540
                                       self.server_address[1])
781
 
            elif not self.server_address[1]:
 
541
            elif self.server_address[1] is None:
782
542
                self.server_address = (self.server_address[0],
783
543
                                       0)
784
 
#                 if self.settings["interface"]:
785
 
#                     self.server_address = (self.server_address[0],
786
 
#                                            0, # port
787
 
#                                            0, # flowinfo
788
 
#                                            if_nametoindex
789
 
#                                            (self.settings
790
 
#                                             ["interface"]))
791
 
            return super(IPv6_TCPServer, self).server_bind()
792
 
    def server_activate(self):
793
 
        if self.enabled:
794
 
            return super(IPv6_TCPServer, self).server_activate()
795
 
    def enable(self):
796
 
        self.enabled = True
 
544
            return super(type(self), self).server_bind()
797
545
 
798
546
 
799
547
def string_to_delta(interval):
800
548
    """Parse a string and return a datetime.timedelta
801
 
    
 
549
 
802
550
    >>> string_to_delta('7d')
803
551
    datetime.timedelta(7)
804
552
    >>> string_to_delta('60s')
809
557
    datetime.timedelta(1)
810
558
    >>> string_to_delta(u'1w')
811
559
    datetime.timedelta(7)
812
 
    >>> string_to_delta('5m 30s')
813
 
    datetime.timedelta(0, 330)
814
560
    """
815
 
    timevalue = datetime.timedelta(0)
816
 
    for s in interval.split():
817
 
        try:
818
 
            suffix = unicode(s[-1])
819
 
            value = int(s[:-1])
820
 
            if suffix == u"d":
821
 
                delta = datetime.timedelta(value)
822
 
            elif suffix == u"s":
823
 
                delta = datetime.timedelta(0, value)
824
 
            elif suffix == u"m":
825
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
826
 
            elif suffix == u"h":
827
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
828
 
            elif suffix == u"w":
829
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
830
 
            else:
831
 
                raise ValueError
832
 
        except (ValueError, IndexError):
 
561
    try:
 
562
        suffix=unicode(interval[-1])
 
563
        value=int(interval[:-1])
 
564
        if suffix == u"d":
 
565
            delta = datetime.timedelta(value)
 
566
        elif suffix == u"s":
 
567
            delta = datetime.timedelta(0, value)
 
568
        elif suffix == u"m":
 
569
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
570
        elif suffix == u"h":
 
571
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
572
        elif suffix == u"w":
 
573
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
574
        else:
833
575
            raise ValueError
834
 
        timevalue += delta
835
 
    return timevalue
 
576
    except (ValueError, IndexError):
 
577
        raise ValueError
 
578
    return delta
836
579
 
837
580
 
838
581
def server_state_changed(state):
839
582
    """Derived from the Avahi example code"""
840
583
    if state == avahi.SERVER_COLLISION:
841
 
        logger.error(u"Zeroconf server name collision")
 
584
        logger.warning(u"Server name collision")
842
585
        service.remove()
843
586
    elif state == avahi.SERVER_RUNNING:
844
587
        service.add()
846
589
 
847
590
def entry_group_state_changed(state, error):
848
591
    """Derived from the Avahi example code"""
849
 
    logger.debug(u"Avahi state change: %i", state)
 
592
    logger.debug(u"state change: %i", state)
850
593
    
851
594
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
852
 
        logger.debug(u"Zeroconf service established.")
 
595
        logger.debug(u"Service established.")
853
596
    elif state == avahi.ENTRY_GROUP_COLLISION:
854
 
        logger.warning(u"Zeroconf service name collision.")
 
597
        logger.warning(u"Service name collision.")
855
598
        service.rename()
856
599
    elif state == avahi.ENTRY_GROUP_FAILURE:
857
 
        logger.critical(u"Avahi: Error in group state changed %s",
 
600
        logger.critical(u"Error in group state changed %s",
858
601
                        unicode(error))
859
 
        raise AvahiGroupError(u"State changed: %s" % unicode(error))
 
602
        raise AvahiGroupError("State changed: %s", str(error))
860
603
 
861
 
def if_nametoindex(interface):
 
604
def if_nametoindex(interface, _func=[None]):
862
605
    """Call the C function if_nametoindex(), or equivalent"""
863
 
    global if_nametoindex
 
606
    if _func[0] is not None:
 
607
        return _func[0](interface)
864
608
    try:
865
 
        if_nametoindex = (ctypes.cdll.LoadLibrary
866
 
                          (ctypes.util.find_library("c"))
867
 
                          .if_nametoindex)
 
609
        if "ctypes.util" not in sys.modules:
 
610
            import ctypes.util
 
611
        while True:
 
612
            try:
 
613
                libc = ctypes.cdll.LoadLibrary\
 
614
                       (ctypes.util.find_library("c"))
 
615
                _func[0] = libc.if_nametoindex
 
616
                return _func[0](interface)
 
617
            except IOError, e:
 
618
                if e != errno.EINTR:
 
619
                    raise
868
620
    except (OSError, AttributeError):
869
621
        if "struct" not in sys.modules:
870
622
            import struct
871
623
        if "fcntl" not in sys.modules:
872
624
            import fcntl
873
 
        def if_nametoindex(interface):
 
625
        def the_hard_way(interface):
874
626
            "Get an interface index the hard way, i.e. using fcntl()"
875
627
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
876
 
            with closing(socket.socket()) as s:
877
 
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
878
 
                                    struct.pack("16s16x", interface))
 
628
            s = socket.socket()
 
629
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
630
                                struct.pack("16s16x", interface))
 
631
            s.close()
879
632
            interface_index = struct.unpack("I", ifreq[16:20])[0]
880
633
            return interface_index
881
 
    return if_nametoindex(interface)
882
 
 
883
 
 
884
 
def daemon(nochdir = False, noclose = False):
 
634
        _func[0] = the_hard_way
 
635
        return _func[0](interface)
 
636
 
 
637
 
 
638
def daemon(nochdir, noclose):
885
639
    """See daemon(3).  Standard BSD Unix function.
886
640
    This should really exist as os.daemon, but it doesn't (yet)."""
887
641
    if os.fork():
889
643
    os.setsid()
890
644
    if not nochdir:
891
645
        os.chdir("/")
892
 
    if os.fork():
893
 
        sys.exit()
894
646
    if not noclose:
895
647
        # Close all standard open file descriptors
896
648
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
905
657
 
906
658
 
907
659
def main():
908
 
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
660
    global main_loop_started
 
661
    main_loop_started = False
 
662
    
 
663
    parser = OptionParser()
909
664
    parser.add_option("-i", "--interface", type="string",
910
665
                      metavar="IF", help="Bind to interface IF")
911
666
    parser.add_option("-a", "--address", type="string",
912
667
                      help="Address to listen for requests on")
913
668
    parser.add_option("-p", "--port", type="int",
914
669
                      help="Port number to receive requests on")
915
 
    parser.add_option("--check", action="store_true",
 
670
    parser.add_option("--check", action="store_true", default=False,
916
671
                      help="Run self-test")
917
 
    parser.add_option("--debug", action="store_true",
 
672
    parser.add_option("--debug", action="store_true", default=False,
918
673
                      help="Debug mode; run in foreground and log to"
919
674
                      " terminal")
920
675
    parser.add_option("--priority", type="string", help="GnuTLS"
925
680
                      default="/etc/mandos", metavar="DIR",
926
681
                      help="Directory to search for configuration"
927
682
                      " files")
928
 
    parser.add_option("--no-dbus", action="store_false",
929
 
                      dest="use_dbus",
930
 
                      help="Do not provide D-Bus system bus"
931
 
                      " interface")
932
 
    options = parser.parse_args()[0]
 
683
    (options, args) = parser.parse_args()
933
684
    
934
685
    if options.check:
935
686
        import doctest
944
695
                        "priority":
945
696
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
946
697
                        "servicename": "Mandos",
947
 
                        "use_dbus": "True",
948
698
                        }
949
699
    
950
700
    # Parse config file for server-global settings
951
701
    server_config = ConfigParser.SafeConfigParser(server_defaults)
952
702
    del server_defaults
953
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
703
    server_config.read(os.path.join(options.configdir, "server.conf"))
 
704
    server_section = "server"
954
705
    # Convert the SafeConfigParser object to a dict
955
 
    server_settings = server_config.defaults()
956
 
    # Use the appropriate methods on the non-string config options
957
 
    server_settings["debug"] = server_config.getboolean("DEFAULT",
958
 
                                                        "debug")
959
 
    server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
960
 
                                                           "use_dbus")
961
 
    if server_settings["port"]:
962
 
        server_settings["port"] = server_config.getint("DEFAULT",
963
 
                                                       "port")
 
706
    server_settings = dict(server_config.items(server_section))
 
707
    # Use getboolean on the boolean config option
 
708
    server_settings["debug"] = server_config.getboolean\
 
709
                               (server_section, "debug")
964
710
    del server_config
965
711
    
966
712
    # Override the settings from the config file with command line
967
713
    # options, if set.
968
714
    for option in ("interface", "address", "port", "debug",
969
 
                   "priority", "servicename", "configdir",
970
 
                   "use_dbus"):
 
715
                   "priority", "servicename", "configdir"):
971
716
        value = getattr(options, option)
972
717
        if value is not None:
973
718
            server_settings[option] = value
974
719
    del options
975
720
    # Now we have our good server settings in "server_settings"
976
721
    
977
 
    # For convenience
978
 
    debug = server_settings["debug"]
979
 
    use_dbus = server_settings["use_dbus"]
980
 
    
981
 
    if not debug:
982
 
        syslogger.setLevel(logging.WARNING)
983
 
        console.setLevel(logging.WARNING)
984
 
    
985
 
    if server_settings["servicename"] != "Mandos":
986
 
        syslogger.setFormatter(logging.Formatter
987
 
                               ('Mandos (%s): %%(levelname)s:'
988
 
                                ' %%(message)s'
989
 
                                % server_settings["servicename"]))
990
 
    
991
722
    # Parse config file with clients
992
723
    client_defaults = { "timeout": "1h",
993
724
                        "interval": "5m",
994
 
                        "checker": "fping -q -- %%(host)s",
995
 
                        "host": "",
 
725
                        "checker": "fping -q -- %%(fqdn)s",
996
726
                        }
997
727
    client_config = ConfigParser.SafeConfigParser(client_defaults)
998
728
    client_config.read(os.path.join(server_settings["configdir"],
999
729
                                    "clients.conf"))
1000
730
    
1001
 
    clients = Set()
1002
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
1003
 
                                 server_settings["port"]),
1004
 
                                TCP_handler,
1005
 
                                settings=server_settings,
1006
 
                                clients=clients)
1007
 
    pidfilename = "/var/run/mandos.pid"
1008
 
    try:
1009
 
        pidfile = open(pidfilename, "w")
1010
 
    except IOError:
1011
 
        logger.error("Could not open file %r", pidfilename)
1012
 
    
1013
 
    try:
1014
 
        uid = pwd.getpwnam("_mandos").pw_uid
1015
 
        gid = pwd.getpwnam("_mandos").pw_gid
1016
 
    except KeyError:
1017
 
        try:
1018
 
            uid = pwd.getpwnam("mandos").pw_uid
1019
 
            gid = pwd.getpwnam("mandos").pw_gid
1020
 
        except KeyError:
1021
 
            try:
1022
 
                uid = pwd.getpwnam("nobody").pw_uid
1023
 
                gid = pwd.getpwnam("nogroup").pw_gid
1024
 
            except KeyError:
1025
 
                uid = 65534
1026
 
                gid = 65534
1027
 
    try:
1028
 
        os.setgid(gid)
1029
 
        os.setuid(uid)
1030
 
    except OSError, error:
1031
 
        if error[0] != errno.EPERM:
1032
 
            raise error
1033
 
    
1034
 
    # Enable all possible GnuTLS debugging
1035
 
    if debug:
1036
 
        # "Use a log level over 10 to enable all debugging options."
1037
 
        # - GnuTLS manual
1038
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
1039
 
        
1040
 
        @gnutls.library.types.gnutls_log_func
1041
 
        def debug_gnutls(level, string):
1042
 
            logger.debug("GnuTLS: %s", string[:-1])
1043
 
        
1044
 
        (gnutls.library.functions
1045
 
         .gnutls_global_set_log_function(debug_gnutls))
1046
 
    
1047
731
    global service
1048
732
    service = AvahiService(name = server_settings["servicename"],
1049
 
                           servicetype = "_mandos._tcp", )
 
733
                           type = "_mandos._tcp", );
1050
734
    if server_settings["interface"]:
1051
 
        service.interface = (if_nametoindex
1052
 
                             (server_settings["interface"]))
 
735
        service.interface = if_nametoindex(server_settings["interface"])
1053
736
    
1054
737
    global main_loop
1055
738
    global bus
1058
741
    DBusGMainLoop(set_as_default=True )
1059
742
    main_loop = gobject.MainLoop()
1060
743
    bus = dbus.SystemBus()
1061
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1062
 
                                           avahi.DBUS_PATH_SERVER),
1063
 
                            avahi.DBUS_INTERFACE_SERVER)
 
744
    server = dbus.Interface(
 
745
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
746
            avahi.DBUS_INTERFACE_SERVER )
1064
747
    # End of Avahi example code
1065
 
    if use_dbus:
1066
 
        bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1067
 
    
1068
 
    clients.update(Set(Client(name = section,
1069
 
                              config
1070
 
                              = dict(client_config.items(section)),
1071
 
                              use_dbus = use_dbus)
 
748
    
 
749
    debug = server_settings["debug"]
 
750
    
 
751
    if debug:
 
752
        console = logging.StreamHandler()
 
753
        # console.setLevel(logging.DEBUG)
 
754
        console.setFormatter(logging.Formatter\
 
755
                             ('%(levelname)s: %(message)s'))
 
756
        logger.addHandler(console)
 
757
        del console
 
758
    
 
759
    clients = Set()
 
760
    def remove_from_clients(client):
 
761
        clients.remove(client)
 
762
        if not clients:
 
763
            logger.debug(u"No clients left, exiting")
 
764
            sys.exit()
 
765
    
 
766
    clients.update(Set(Client(name=section,
 
767
                              stop_hook = remove_from_clients,
 
768
                              **(dict(client_config\
 
769
                                      .items(section))))
1072
770
                       for section in client_config.sections()))
1073
 
    if not clients:
1074
 
        logger.warning(u"No clients defined")
1075
 
    
1076
 
    if debug:
1077
 
        # Redirect stdin so all checkers get /dev/null
1078
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1079
 
        os.dup2(null, sys.stdin.fileno())
1080
 
        if null > 2:
1081
 
            os.close(null)
1082
 
    else:
1083
 
        # No console logging
1084
 
        logger.removeHandler(console)
1085
 
        # Close all input and output, do double fork, etc.
1086
 
        daemon()
1087
 
    
1088
 
    try:
1089
 
        pid = os.getpid()
1090
 
        pidfile.write(str(pid) + "\n")
1091
 
        pidfile.close()
1092
 
        del pidfile
1093
 
    except IOError:
1094
 
        logger.error(u"Could not write to file %r with PID %d",
1095
 
                     pidfilename, pid)
1096
 
    except NameError:
1097
 
        # "pidfile" was never created
1098
 
        pass
1099
 
    del pidfilename
 
771
    
 
772
    if not debug:
 
773
        daemon(False, False)
1100
774
    
1101
775
    def cleanup():
1102
776
        "Cleanup function; run on exit"
1109
783
        
1110
784
        while clients:
1111
785
            client = clients.pop()
1112
 
            client.disable_hook = None
1113
 
            client.disable()
 
786
            client.stop_hook = None
 
787
            client.stop()
1114
788
    
1115
789
    atexit.register(cleanup)
1116
790
    
1119
793
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1120
794
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1121
795
    
1122
 
    if use_dbus:
1123
 
        class MandosServer(dbus.service.Object):
1124
 
            """A D-Bus proxy object"""
1125
 
            def __init__(self):
1126
 
                dbus.service.Object.__init__(self, bus, "/")
1127
 
            _interface = u"se.bsnet.fukt.Mandos"
1128
 
            
1129
 
            @dbus.service.signal(_interface, signature="oa{sv}")
1130
 
            def ClientAdded(self, objpath, properties):
1131
 
                "D-Bus signal"
1132
 
                pass
1133
 
            
1134
 
            @dbus.service.signal(_interface, signature="os")
1135
 
            def ClientRemoved(self, objpath, name):
1136
 
                "D-Bus signal"
1137
 
                pass
1138
 
            
1139
 
            @dbus.service.method(_interface, out_signature="ao")
1140
 
            def GetAllClients(self):
1141
 
                "D-Bus method"
1142
 
                return dbus.Array(c.dbus_object_path for c in clients)
1143
 
            
1144
 
            @dbus.service.method(_interface, out_signature="a{oa{sv}}")
1145
 
            def GetAllClientsWithProperties(self):
1146
 
                "D-Bus method"
1147
 
                return dbus.Dictionary(
1148
 
                    ((c.dbus_object_path, c.GetAllProperties())
1149
 
                     for c in clients),
1150
 
                    signature="oa{sv}")
1151
 
            
1152
 
            @dbus.service.method(_interface, in_signature="o")
1153
 
            def RemoveClient(self, object_path):
1154
 
                "D-Bus method"
1155
 
                for c in clients:
1156
 
                    if c.dbus_object_path == object_path:
1157
 
                        clients.remove(c)
1158
 
                        # Don't signal anything except ClientRemoved
1159
 
                        c.use_dbus = False
1160
 
                        c.disable()
1161
 
                        # Emit D-Bus signal
1162
 
                        self.ClientRemoved(object_path, c.name)
1163
 
                        return
1164
 
                raise KeyError
1165
 
            
1166
 
            del _interface
1167
 
        
1168
 
        mandos_server = MandosServer()
1169
 
    
1170
796
    for client in clients:
1171
 
        if use_dbus:
1172
 
            # Emit D-Bus signal
1173
 
            mandos_server.ClientAdded(client.dbus_object_path,
1174
 
                                      client.GetAllProperties())
1175
 
        client.enable()
1176
 
    
1177
 
    tcp_server.enable()
1178
 
    tcp_server.server_activate()
1179
 
    
 
797
        client.start()
 
798
    
 
799
    tcp_server = IPv6_TCPServer((server_settings["address"],
 
800
                                 server_settings["port"]),
 
801
                                tcp_handler,
 
802
                                settings=server_settings,
 
803
                                clients=clients)
1180
804
    # Find out what port we got
1181
805
    service.port = tcp_server.socket.getsockname()[1]
1182
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1183
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
806
    logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
 
807
                 u" scope_id %d" % tcp_server.socket.getsockname())
1184
808
    
1185
809
    #service.interface = tcp_server.socket.getsockname()[3]
1186
810
    
1196
820
        
1197
821
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1198
822
                             lambda *args, **kwargs:
1199
 
                             (tcp_server.handle_request
1200
 
                              (*args[2:], **kwargs) or True))
 
823
                             tcp_server.handle_request\
 
824
                             (*args[2:], **kwargs) or True)
1201
825
        
1202
 
        logger.debug(u"Starting main loop")
 
826
        logger.debug("Starting main loop")
 
827
        main_loop_started = True
1203
828
        main_loop.run()
1204
829
    except AvahiError, error:
1205
 
        logger.critical(u"AvahiError: %s", error)
 
830
        logger.critical(u"AvahiError: %s" + unicode(error))
1206
831
        sys.exit(1)
1207
832
    except KeyboardInterrupt:
1208
833
        if debug:
1209
 
            print >> sys.stderr
1210
 
        logger.debug("Server received KeyboardInterrupt")
1211
 
    logger.debug("Server exiting")
 
834
            print
1212
835
 
1213
836
if __name__ == '__main__':
1214
837
    main()