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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
 
# 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
# methods "add", "remove", "server_state_changed",
 
10
# "entry_group_state_changed", "cleanup", and "activate" in the
 
11
# "AvahiService" class, 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
 
import SocketServer
 
36
import SocketServer as 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
43
44
import gnutls.library.functions
44
45
import gnutls.library.constants
45
46
import gnutls.library.types
46
 
import ConfigParser
 
47
import ConfigParser as configparser
47
48
import sys
48
49
import re
49
50
import os
50
51
import signal
51
 
from sets import Set
52
52
import subprocess
53
53
import atexit
54
54
import stat
55
55
import logging
56
56
import logging.handlers
 
57
import pwd
 
58
import contextlib
 
59
import struct
 
60
import fcntl
 
61
import functools
 
62
import cPickle as pickle
 
63
import multiprocessing
57
64
 
58
65
import dbus
 
66
import dbus.service
59
67
import gobject
60
68
import avahi
61
69
from dbus.mainloop.glib import DBusGMainLoop
62
70
import ctypes
63
 
 
64
 
version = "1.0"
65
 
 
66
 
logger = logging.Logger('mandos')
67
 
syslogger = logging.handlers.SysLogHandler\
68
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
69
 
             address = "/dev/log")
70
 
syslogger.setFormatter(logging.Formatter\
71
 
                        ('Mandos: %(levelname)s: %(message)s'))
 
71
import ctypes.util
 
72
import xml.dom.minidom
 
73
import inspect
 
74
 
 
75
try:
 
76
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
77
except AttributeError:
 
78
    try:
 
79
        from IN import SO_BINDTODEVICE
 
80
    except ImportError:
 
81
        SO_BINDTODEVICE = None
 
82
 
 
83
 
 
84
version = "1.0.14"
 
85
 
 
86
#logger = logging.getLogger(u'mandos')
 
87
logger = logging.Logger(u'mandos')
 
88
syslogger = (logging.handlers.SysLogHandler
 
89
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
90
              address = "/dev/log"))
 
91
syslogger.setFormatter(logging.Formatter
 
92
                       (u'Mandos [%(process)d]: %(levelname)s:'
 
93
                        u' %(message)s'))
72
94
logger.addHandler(syslogger)
73
95
 
74
96
console = logging.StreamHandler()
75
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
76
 
                                       ' %(message)s'))
 
97
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
 
98
                                       u' %(levelname)s:'
 
99
                                       u' %(message)s'))
77
100
logger.addHandler(console)
78
101
 
79
102
class AvahiError(Exception):
80
 
    def __init__(self, value):
 
103
    def __init__(self, value, *args, **kwargs):
81
104
        self.value = value
82
 
    def __str__(self):
83
 
        return repr(self.value)
 
105
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
106
    def __unicode__(self):
 
107
        return unicode(repr(self.value))
84
108
 
85
109
class AvahiServiceError(AvahiError):
86
110
    pass
91
115
 
92
116
class AvahiService(object):
93
117
    """An Avahi (Zeroconf) service.
 
118
    
94
119
    Attributes:
95
120
    interface: integer; avahi.IF_UNSPEC or an interface index.
96
121
               Used to optionally bind to the specified interface.
97
 
    name: string; Example: 'Mandos'
98
 
    type: string; Example: '_mandos._tcp'.
 
122
    name: string; Example: u'Mandos'
 
123
    type: string; Example: u'_mandos._tcp'.
99
124
                  See <http://www.dns-sd.org/ServiceTypes.html>
100
125
    port: integer; what port to announce
101
126
    TXT: list of strings; TXT record for the service
104
129
    max_renames: integer; maximum number of renames
105
130
    rename_count: integer; counter so we only rename after collisions
106
131
                  a sensible number of times
 
132
    group: D-Bus Entry Group
 
133
    server: D-Bus Server
 
134
    bus: dbus.SystemBus()
107
135
    """
108
136
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
109
 
                 type = None, port = None, TXT = None, domain = "",
110
 
                 host = "", max_renames = 32768):
 
137
                 servicetype = None, port = None, TXT = None,
 
138
                 domain = u"", host = u"", max_renames = 32768,
 
139
                 protocol = avahi.PROTO_UNSPEC, bus = None):
111
140
        self.interface = interface
112
141
        self.name = name
113
 
        self.type = type
 
142
        self.type = servicetype
114
143
        self.port = port
115
 
        if TXT is None:
116
 
            self.TXT = []
117
 
        else:
118
 
            self.TXT = TXT
 
144
        self.TXT = TXT if TXT is not None else []
119
145
        self.domain = domain
120
146
        self.host = host
121
147
        self.rename_count = 0
 
148
        self.max_renames = max_renames
 
149
        self.protocol = protocol
 
150
        self.group = None       # our entry group
 
151
        self.server = None
 
152
        self.bus = bus
122
153
    def rename(self):
123
154
        """Derived from the Avahi example code"""
124
155
        if self.rename_count >= self.max_renames:
125
 
            logger.critical(u"No suitable service name found after %i"
126
 
                            u" retries, exiting.", rename_count)
127
 
            raise AvahiServiceError("Too many renames")
128
 
        name = server.GetAlternativeServiceName(name)
129
 
        logger.error(u"Changing name to %r ...", name)
130
 
        syslogger.setFormatter(logging.Formatter\
131
 
                               ('Mandos (%s): %%(levelname)s:'
132
 
                               ' %%(message)s' % name))
 
156
            logger.critical(u"No suitable Zeroconf service name found"
 
157
                            u" after %i retries, exiting.",
 
158
                            self.rename_count)
 
159
            raise AvahiServiceError(u"Too many renames")
 
160
        self.name = self.server.GetAlternativeServiceName(self.name)
 
161
        logger.info(u"Changing Zeroconf service name to %r ...",
 
162
                    unicode(self.name))
 
163
        syslogger.setFormatter(logging.Formatter
 
164
                               (u'Mandos (%s) [%%(process)d]:'
 
165
                                u' %%(levelname)s: %%(message)s'
 
166
                                % self.name))
133
167
        self.remove()
134
168
        self.add()
135
169
        self.rename_count += 1
136
170
    def remove(self):
137
171
        """Derived from the Avahi example code"""
138
 
        if group is not None:
139
 
            group.Reset()
 
172
        if self.group is not None:
 
173
            self.group.Reset()
140
174
    def add(self):
141
175
        """Derived from the Avahi example code"""
142
 
        global group
143
 
        if group is None:
144
 
            group = dbus.Interface\
145
 
                    (bus.get_object(avahi.DBUS_NAME,
146
 
                                    server.EntryGroupNew()),
147
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
148
 
            group.connect_to_signal('StateChanged',
149
 
                                    entry_group_state_changed)
150
 
        logger.debug(u"Adding service '%s' of type '%s' ...",
151
 
                     service.name, service.type)
152
 
        group.AddService(
153
 
                self.interface,         # interface
154
 
                avahi.PROTO_INET6,      # protocol
155
 
                dbus.UInt32(0),         # flags
156
 
                self.name, self.type,
157
 
                self.domain, self.host,
158
 
                dbus.UInt16(self.port),
159
 
                avahi.string_array_to_txt_array(self.TXT))
160
 
        group.Commit()
161
 
 
162
 
# From the Avahi example code:
163
 
group = None                            # our entry group
164
 
# End of Avahi example code
 
176
        if self.group is None:
 
177
            self.group = dbus.Interface(
 
178
                self.bus.get_object(avahi.DBUS_NAME,
 
179
                                    self.server.EntryGroupNew()),
 
180
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
181
            self.group.connect_to_signal('StateChanged',
 
182
                                         self
 
183
                                         .entry_group_state_changed)
 
184
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
 
185
                     self.name, self.type)
 
186
        self.group.AddService(
 
187
            self.interface,
 
188
            self.protocol,
 
189
            dbus.UInt32(0),     # flags
 
190
            self.name, self.type,
 
191
            self.domain, self.host,
 
192
            dbus.UInt16(self.port),
 
193
            avahi.string_array_to_txt_array(self.TXT))
 
194
        self.group.Commit()
 
195
    def entry_group_state_changed(self, state, error):
 
196
        """Derived from the Avahi example code"""
 
197
        logger.debug(u"Avahi state change: %i", state)
 
198
        
 
199
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
200
            logger.debug(u"Zeroconf service established.")
 
201
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
202
            logger.warning(u"Zeroconf service name collision.")
 
203
            self.rename()
 
204
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
205
            logger.critical(u"Avahi: Error in group state changed %s",
 
206
                            unicode(error))
 
207
            raise AvahiGroupError(u"State changed: %s"
 
208
                                  % unicode(error))
 
209
    def cleanup(self):
 
210
        """Derived from the Avahi example code"""
 
211
        if self.group is not None:
 
212
            self.group.Free()
 
213
            self.group = None
 
214
    def server_state_changed(self, state):
 
215
        """Derived from the Avahi example code"""
 
216
        if state == avahi.SERVER_COLLISION:
 
217
            logger.error(u"Zeroconf server name collision")
 
218
            self.remove()
 
219
        elif state == avahi.SERVER_RUNNING:
 
220
            self.add()
 
221
    def activate(self):
 
222
        """Derived from the Avahi example code"""
 
223
        if self.server is None:
 
224
            self.server = dbus.Interface(
 
225
                self.bus.get_object(avahi.DBUS_NAME,
 
226
                                    avahi.DBUS_PATH_SERVER),
 
227
                avahi.DBUS_INTERFACE_SERVER)
 
228
        self.server.connect_to_signal(u"StateChanged",
 
229
                                 self.server_state_changed)
 
230
        self.server_state_changed(self.server.GetState())
165
231
 
166
232
 
167
233
class Client(object):
168
234
    """A representation of a client host served by this server.
 
235
    
169
236
    Attributes:
170
 
    name:      string; from the config file, used in log messages
 
237
    name:       string; from the config file, used in log messages and
 
238
                        D-Bus identifiers
171
239
    fingerprint: string (40 or 32 hexadecimal digits); used to
172
240
                 uniquely identify the client
173
 
    secret:    bytestring; sent verbatim (over TLS) to client
174
 
    host:      string; available for use by the checker command
175
 
    created:   datetime.datetime(); object creation, not client host
176
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
177
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
178
 
                                     until this client is invalid
179
 
    interval:  datetime.timedelta(); How often to start a new checker
180
 
    stop_hook: If set, called by stop() as stop_hook(self)
181
 
    checker:   subprocess.Popen(); a running checker process used
182
 
                                   to see if the client lives.
183
 
                                   'None' if no process is running.
 
241
    secret:     bytestring; sent verbatim (over TLS) to client
 
242
    host:       string; available for use by the checker command
 
243
    created:    datetime.datetime(); (UTC) object creation
 
244
    last_enabled: datetime.datetime(); (UTC)
 
245
    enabled:    bool()
 
246
    last_checked_ok: datetime.datetime(); (UTC) or None
 
247
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
248
                                      until this client is disabled
 
249
    interval:   datetime.timedelta(); How often to start a new checker
 
250
    disable_hook:  If set, called by disable() as disable_hook(self)
 
251
    checker:    subprocess.Popen(); a running checker process used
 
252
                                    to see if the client lives.
 
253
                                    'None' if no process is running.
184
254
    checker_initiator_tag: a gobject event source tag, or None
185
 
    stop_initiator_tag:    - '' -
 
255
    disable_initiator_tag: - '' -
186
256
    checker_callback_tag:  - '' -
187
257
    checker_command: string; External command which is run to check if
188
258
                     client lives.  %() expansions are done at
189
259
                     runtime with vars(self) as dict, so that for
190
260
                     instance %(name)s can be used in the command.
191
 
    Private attibutes:
192
 
    _timeout: Real variable for 'timeout'
193
 
    _interval: Real variable for 'interval'
194
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
195
 
    _interval_milliseconds: - '' -
 
261
    current_checker_command: string; current running checker_command
 
262
    approved_delay: datetime.timedelta(); Time to wait for approval
 
263
    _approved:   bool(); 'None' if not yet approved/disapproved
 
264
    approved_duration: datetime.timedelta(); Duration of one approval
196
265
    """
197
 
    def _set_timeout(self, timeout):
198
 
        "Setter function for 'timeout' attribute"
199
 
        self._timeout = timeout
200
 
        self._timeout_milliseconds = ((self.timeout.days
201
 
                                       * 24 * 60 * 60 * 1000)
202
 
                                      + (self.timeout.seconds * 1000)
203
 
                                      + (self.timeout.microseconds
204
 
                                         // 1000))
205
 
    timeout = property(lambda self: self._timeout,
206
 
                       _set_timeout)
207
 
    del _set_timeout
208
 
    def _set_interval(self, interval):
209
 
        "Setter function for 'interval' attribute"
210
 
        self._interval = interval
211
 
        self._interval_milliseconds = ((self.interval.days
212
 
                                        * 24 * 60 * 60 * 1000)
213
 
                                       + (self.interval.seconds
214
 
                                          * 1000)
215
 
                                       + (self.interval.microseconds
216
 
                                          // 1000))
217
 
    interval = property(lambda self: self._interval,
218
 
                        _set_interval)
219
 
    del _set_interval
220
 
    def __init__(self, name = None, stop_hook=None, config={}):
 
266
    
 
267
    @staticmethod
 
268
    def _timedelta_to_milliseconds(td):
 
269
        "Convert a datetime.timedelta() to milliseconds"
 
270
        return ((td.days * 24 * 60 * 60 * 1000)
 
271
                + (td.seconds * 1000)
 
272
                + (td.microseconds // 1000))
 
273
    
 
274
    def timeout_milliseconds(self):
 
275
        "Return the 'timeout' attribute in milliseconds"
 
276
        return self._timedelta_to_milliseconds(self.timeout)
 
277
    
 
278
    def interval_milliseconds(self):
 
279
        "Return the 'interval' attribute in milliseconds"
 
280
        return self._timedelta_to_milliseconds(self.interval)
 
281
 
 
282
    def approved_delay_milliseconds(self):
 
283
        return self._timedelta_to_milliseconds(self.approved_delay)
 
284
    
 
285
    def __init__(self, name = None, disable_hook=None, config=None):
221
286
        """Note: the 'checker' key in 'config' sets the
222
287
        'checker_command' attribute and *not* the 'checker'
223
288
        attribute."""
224
289
        self.name = name
 
290
        if config is None:
 
291
            config = {}
225
292
        logger.debug(u"Creating client %r", self.name)
226
293
        # Uppercase and remove spaces from fingerprint for later
227
294
        # comparison purposes with return value from the fingerprint()
228
295
        # function
229
 
        self.fingerprint = config["fingerprint"].upper()\
230
 
                           .replace(u" ", u"")
 
296
        self.fingerprint = (config[u"fingerprint"].upper()
 
297
                            .replace(u" ", u""))
231
298
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
232
 
        if "secret" in config:
233
 
            self.secret = config["secret"].decode(u"base64")
234
 
        elif "secfile" in config:
235
 
            sf = open(config["secfile"])
236
 
            self.secret = sf.read()
237
 
            sf.close()
 
299
        if u"secret" in config:
 
300
            self.secret = config[u"secret"].decode(u"base64")
 
301
        elif u"secfile" in config:
 
302
            with open(os.path.expanduser(os.path.expandvars
 
303
                                         (config[u"secfile"])),
 
304
                      "rb") as secfile:
 
305
                self.secret = secfile.read()
238
306
        else:
 
307
            #XXX Need to allow secret on demand!
239
308
            raise TypeError(u"No secret or secfile for client %s"
240
309
                            % self.name)
241
 
        self.host = config.get("host", "")
242
 
        self.created = datetime.datetime.now()
 
310
        self.host = config.get(u"host", u"")
 
311
        self.created = datetime.datetime.utcnow()
 
312
        self.enabled = False
 
313
        self.last_enabled = None
243
314
        self.last_checked_ok = None
244
 
        self.timeout = string_to_delta(config["timeout"])
245
 
        self.interval = string_to_delta(config["interval"])
246
 
        self.stop_hook = stop_hook
 
315
        self.timeout = string_to_delta(config[u"timeout"])
 
316
        self.interval = string_to_delta(config[u"interval"])
 
317
        self.disable_hook = disable_hook
247
318
        self.checker = None
248
319
        self.checker_initiator_tag = None
249
 
        self.stop_initiator_tag = None
 
320
        self.disable_initiator_tag = None
250
321
        self.checker_callback_tag = None
251
 
        self.check_command = config["checker"]
252
 
    def start(self):
 
322
        self.checker_command = config[u"checker"]
 
323
        self.current_checker_command = None
 
324
        self.last_connect = None
 
325
        self._approved = None
 
326
        self.approved_by_default = config.get(u"approved_by_default",
 
327
                                              True)
 
328
        self.approvals_pending = 0
 
329
        self.approved_delay = string_to_delta(
 
330
            config[u"approved_delay"])
 
331
        self.approved_duration = string_to_delta(
 
332
            config[u"approved_duration"])
 
333
        self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
 
334
    
 
335
    def send_changedstate(self):
 
336
        self.changedstate.acquire()
 
337
        self.changedstate.notify_all()
 
338
        self.changedstate.release()
 
339
        
 
340
    def enable(self):
253
341
        """Start this client's checker and timeout hooks"""
 
342
        if getattr(self, u"enabled", False):
 
343
            # Already enabled
 
344
            return
 
345
        self.send_changedstate()
 
346
        self.last_enabled = datetime.datetime.utcnow()
254
347
        # Schedule a new checker to be started an 'interval' from now,
255
348
        # and every interval from then on.
256
 
        self.checker_initiator_tag = gobject.timeout_add\
257
 
                                     (self._interval_milliseconds,
258
 
                                      self.start_checker)
 
349
        self.checker_initiator_tag = (gobject.timeout_add
 
350
                                      (self.interval_milliseconds(),
 
351
                                       self.start_checker))
 
352
        # Schedule a disable() when 'timeout' has passed
 
353
        self.disable_initiator_tag = (gobject.timeout_add
 
354
                                   (self.timeout_milliseconds(),
 
355
                                    self.disable))
 
356
        self.enabled = True
259
357
        # Also start a new checker *right now*.
260
358
        self.start_checker()
261
 
        # Schedule a stop() when 'timeout' has passed
262
 
        self.stop_initiator_tag = gobject.timeout_add\
263
 
                                  (self._timeout_milliseconds,
264
 
                                   self.stop)
265
 
    def stop(self):
266
 
        """Stop this client.
267
 
        The possibility that a client might be restarted is left open,
268
 
        but not currently used."""
269
 
        # If this client doesn't have a secret, it is already stopped.
270
 
        if hasattr(self, "secret") and self.secret:
271
 
            logger.info(u"Stopping client %s", self.name)
272
 
            self.secret = None
273
 
        else:
 
359
    
 
360
    def disable(self, quiet=True):
 
361
        """Disable this client."""
 
362
        if not getattr(self, "enabled", False):
274
363
            return False
275
 
        if getattr(self, "stop_initiator_tag", False):
276
 
            gobject.source_remove(self.stop_initiator_tag)
277
 
            self.stop_initiator_tag = None
278
 
        if getattr(self, "checker_initiator_tag", False):
 
364
        if not quiet:
 
365
            self.send_changedstate()
 
366
        if not quiet:
 
367
            logger.info(u"Disabling client %s", self.name)
 
368
        if getattr(self, u"disable_initiator_tag", False):
 
369
            gobject.source_remove(self.disable_initiator_tag)
 
370
            self.disable_initiator_tag = None
 
371
        if getattr(self, u"checker_initiator_tag", False):
279
372
            gobject.source_remove(self.checker_initiator_tag)
280
373
            self.checker_initiator_tag = None
281
374
        self.stop_checker()
282
 
        if self.stop_hook:
283
 
            self.stop_hook(self)
 
375
        if self.disable_hook:
 
376
            self.disable_hook(self)
 
377
        self.enabled = False
284
378
        # Do not run this again if called by a gobject.timeout_add
285
379
        return False
 
380
    
286
381
    def __del__(self):
287
 
        self.stop_hook = None
288
 
        self.stop()
289
 
    def checker_callback(self, pid, condition):
 
382
        self.disable_hook = None
 
383
        self.disable()
 
384
    
 
385
    def checker_callback(self, pid, condition, command):
290
386
        """The checker has completed, so take appropriate actions."""
291
 
        now = datetime.datetime.now()
292
387
        self.checker_callback_tag = None
293
388
        self.checker = None
294
 
        if os.WIFEXITED(condition) \
295
 
               and (os.WEXITSTATUS(condition) == 0):
296
 
            logger.info(u"Checker for %(name)s succeeded",
297
 
                        vars(self))
298
 
            self.last_checked_ok = now
299
 
            gobject.source_remove(self.stop_initiator_tag)
300
 
            self.stop_initiator_tag = gobject.timeout_add\
301
 
                                      (self._timeout_milliseconds,
302
 
                                       self.stop)
303
 
        elif not os.WIFEXITED(condition):
 
389
        if os.WIFEXITED(condition):
 
390
            exitstatus = os.WEXITSTATUS(condition)
 
391
            if exitstatus == 0:
 
392
                logger.info(u"Checker for %(name)s succeeded",
 
393
                            vars(self))
 
394
                self.checked_ok()
 
395
            else:
 
396
                logger.info(u"Checker for %(name)s failed",
 
397
                            vars(self))
 
398
        else:
304
399
            logger.warning(u"Checker for %(name)s crashed?",
305
400
                           vars(self))
306
 
        else:
307
 
            logger.info(u"Checker for %(name)s failed",
308
 
                        vars(self))
 
401
    
 
402
    def checked_ok(self):
 
403
        """Bump up the timeout for this client.
 
404
        
 
405
        This should only be called when the client has been seen,
 
406
        alive and well.
 
407
        """
 
408
        self.last_checked_ok = datetime.datetime.utcnow()
 
409
        gobject.source_remove(self.disable_initiator_tag)
 
410
        self.disable_initiator_tag = (gobject.timeout_add
 
411
                                      (self.timeout_milliseconds(),
 
412
                                       self.disable))
 
413
    
309
414
    def start_checker(self):
310
415
        """Start a new checker subprocess if one is not running.
 
416
        
311
417
        If a checker already exists, leave it running and do
312
418
        nothing."""
313
419
        # The reason for not killing a running checker is that if we
316
422
        # client would inevitably timeout, since no checker would get
317
423
        # a chance to run to completion.  If we instead leave running
318
424
        # checkers alone, the checker would have to take more time
319
 
        # than 'timeout' for the client to be declared invalid, which
320
 
        # is as it should be.
 
425
        # than 'timeout' for the client to be disabled, which is as it
 
426
        # should be.
 
427
        
 
428
        # If a checker exists, make sure it is not a zombie
 
429
        try:
 
430
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
431
        except (AttributeError, OSError), error:
 
432
            if (isinstance(error, OSError)
 
433
                and error.errno != errno.ECHILD):
 
434
                raise error
 
435
        else:
 
436
            if pid:
 
437
                logger.warning(u"Checker was a zombie")
 
438
                gobject.source_remove(self.checker_callback_tag)
 
439
                self.checker_callback(pid, status,
 
440
                                      self.current_checker_command)
 
441
        # Start a new checker if needed
321
442
        if self.checker is None:
322
443
            try:
323
 
                # In case check_command has exactly one % operator
324
 
                command = self.check_command % self.host
 
444
                # In case checker_command has exactly one % operator
 
445
                command = self.checker_command % self.host
325
446
            except TypeError:
326
447
                # Escape attributes for the shell
327
 
                escaped_attrs = dict((key, re.escape(str(val)))
 
448
                escaped_attrs = dict((key,
 
449
                                      re.escape(unicode(str(val),
 
450
                                                        errors=
 
451
                                                        u'replace')))
328
452
                                     for key, val in
329
453
                                     vars(self).iteritems())
330
454
                try:
331
 
                    command = self.check_command % escaped_attrs
 
455
                    command = self.checker_command % escaped_attrs
332
456
                except TypeError, error:
333
457
                    logger.error(u'Could not format string "%s":'
334
 
                                 u' %s', self.check_command, error)
 
458
                                 u' %s', self.checker_command, error)
335
459
                    return True # Try again later
 
460
            self.current_checker_command = command
336
461
            try:
337
462
                logger.info(u"Starting checker %r for %s",
338
463
                            command, self.name)
 
464
                # We don't need to redirect stdout and stderr, since
 
465
                # in normal mode, that is already done by daemon(),
 
466
                # and in debug mode we don't want to.  (Stdin is
 
467
                # always replaced by /dev/null.)
339
468
                self.checker = subprocess.Popen(command,
340
469
                                                close_fds=True,
341
 
                                                shell=True, cwd="/")
342
 
                self.checker_callback_tag = gobject.child_watch_add\
343
 
                                            (self.checker.pid,
344
 
                                             self.checker_callback)
345
 
            except subprocess.OSError, error:
 
470
                                                shell=True, cwd=u"/")
 
471
                self.checker_callback_tag = (gobject.child_watch_add
 
472
                                             (self.checker.pid,
 
473
                                              self.checker_callback,
 
474
                                              data=command))
 
475
                # The checker may have completed before the gobject
 
476
                # watch was added.  Check for this.
 
477
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
478
                if pid:
 
479
                    gobject.source_remove(self.checker_callback_tag)
 
480
                    self.checker_callback(pid, status, command)
 
481
            except OSError, error:
346
482
                logger.error(u"Failed to start subprocess: %s",
347
483
                             error)
348
484
        # Re-run this periodically if run by gobject.timeout_add
349
485
        return True
 
486
    
350
487
    def stop_checker(self):
351
488
        """Force the checker process, if any, to stop."""
352
489
        if self.checker_callback_tag:
353
490
            gobject.source_remove(self.checker_callback_tag)
354
491
            self.checker_callback_tag = None
355
 
        if getattr(self, "checker", None) is None:
 
492
        if getattr(self, u"checker", None) is None:
356
493
            return
357
494
        logger.debug(u"Stopping checker for %(name)s", vars(self))
358
495
        try:
359
496
            os.kill(self.checker.pid, signal.SIGTERM)
360
 
            #os.sleep(0.5)
 
497
            #time.sleep(0.5)
361
498
            #if self.checker.poll() is None:
362
499
            #    os.kill(self.checker.pid, signal.SIGKILL)
363
500
        except OSError, error:
364
501
            if error.errno != errno.ESRCH: # No such process
365
502
                raise
366
503
        self.checker = None
367
 
    def still_valid(self):
368
 
        """Has the timeout not yet passed for this client?"""
369
 
        now = datetime.datetime.now()
 
504
 
 
505
def dbus_service_property(dbus_interface, signature=u"v",
 
506
                          access=u"readwrite", byte_arrays=False):
 
507
    """Decorators for marking methods of a DBusObjectWithProperties to
 
508
    become properties on the D-Bus.
 
509
    
 
510
    The decorated method will be called with no arguments by "Get"
 
511
    and with one argument by "Set".
 
512
    
 
513
    The parameters, where they are supported, are the same as
 
514
    dbus.service.method, except there is only "signature", since the
 
515
    type from Get() and the type sent to Set() is the same.
 
516
    """
 
517
    # Encoding deeply encoded byte arrays is not supported yet by the
 
518
    # "Set" method, so we fail early here:
 
519
    if byte_arrays and signature != u"ay":
 
520
        raise ValueError(u"Byte arrays not supported for non-'ay'"
 
521
                         u" signature %r" % signature)
 
522
    def decorator(func):
 
523
        func._dbus_is_property = True
 
524
        func._dbus_interface = dbus_interface
 
525
        func._dbus_signature = signature
 
526
        func._dbus_access = access
 
527
        func._dbus_name = func.__name__
 
528
        if func._dbus_name.endswith(u"_dbus_property"):
 
529
            func._dbus_name = func._dbus_name[:-14]
 
530
        func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
 
531
        return func
 
532
    return decorator
 
533
 
 
534
 
 
535
class DBusPropertyException(dbus.exceptions.DBusException):
 
536
    """A base class for D-Bus property-related exceptions
 
537
    """
 
538
    def __unicode__(self):
 
539
        return unicode(str(self))
 
540
 
 
541
 
 
542
class DBusPropertyAccessException(DBusPropertyException):
 
543
    """A property's access permissions disallows an operation.
 
544
    """
 
545
    pass
 
546
 
 
547
 
 
548
class DBusPropertyNotFound(DBusPropertyException):
 
549
    """An attempt was made to access a non-existing property.
 
550
    """
 
551
    pass
 
552
 
 
553
 
 
554
class DBusObjectWithProperties(dbus.service.Object):
 
555
    """A D-Bus object with properties.
 
556
 
 
557
    Classes inheriting from this can use the dbus_service_property
 
558
    decorator to expose methods as D-Bus properties.  It exposes the
 
559
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
560
    """
 
561
    
 
562
    @staticmethod
 
563
    def _is_dbus_property(obj):
 
564
        return getattr(obj, u"_dbus_is_property", False)
 
565
    
 
566
    def _get_all_dbus_properties(self):
 
567
        """Returns a generator of (name, attribute) pairs
 
568
        """
 
569
        return ((prop._dbus_name, prop)
 
570
                for name, prop in
 
571
                inspect.getmembers(self, self._is_dbus_property))
 
572
    
 
573
    def _get_dbus_property(self, interface_name, property_name):
 
574
        """Returns a bound method if one exists which is a D-Bus
 
575
        property with the specified name and interface.
 
576
        """
 
577
        for name in (property_name,
 
578
                     property_name + u"_dbus_property"):
 
579
            prop = getattr(self, name, None)
 
580
            if (prop is None
 
581
                or not self._is_dbus_property(prop)
 
582
                or prop._dbus_name != property_name
 
583
                or (interface_name and prop._dbus_interface
 
584
                    and interface_name != prop._dbus_interface)):
 
585
                continue
 
586
            return prop
 
587
        # No such property
 
588
        raise DBusPropertyNotFound(self.dbus_object_path + u":"
 
589
                                   + interface_name + u"."
 
590
                                   + property_name)
 
591
    
 
592
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
 
593
                         out_signature=u"v")
 
594
    def Get(self, interface_name, property_name):
 
595
        """Standard D-Bus property Get() method, see D-Bus standard.
 
596
        """
 
597
        prop = self._get_dbus_property(interface_name, property_name)
 
598
        if prop._dbus_access == u"write":
 
599
            raise DBusPropertyAccessException(property_name)
 
600
        value = prop()
 
601
        if not hasattr(value, u"variant_level"):
 
602
            return value
 
603
        return type(value)(value, variant_level=value.variant_level+1)
 
604
    
 
605
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
 
606
    def Set(self, interface_name, property_name, value):
 
607
        """Standard D-Bus property Set() method, see D-Bus standard.
 
608
        """
 
609
        prop = self._get_dbus_property(interface_name, property_name)
 
610
        if prop._dbus_access == u"read":
 
611
            raise DBusPropertyAccessException(property_name)
 
612
        if prop._dbus_get_args_options[u"byte_arrays"]:
 
613
            # The byte_arrays option is not supported yet on
 
614
            # signatures other than "ay".
 
615
            if prop._dbus_signature != u"ay":
 
616
                raise ValueError
 
617
            value = dbus.ByteArray(''.join(unichr(byte)
 
618
                                           for byte in value))
 
619
        prop(value)
 
620
    
 
621
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
 
622
                         out_signature=u"a{sv}")
 
623
    def GetAll(self, interface_name):
 
624
        """Standard D-Bus property GetAll() method, see D-Bus
 
625
        standard.
 
626
 
 
627
        Note: Will not include properties with access="write".
 
628
        """
 
629
        all = {}
 
630
        for name, prop in self._get_all_dbus_properties():
 
631
            if (interface_name
 
632
                and interface_name != prop._dbus_interface):
 
633
                # Interface non-empty but did not match
 
634
                continue
 
635
            # Ignore write-only properties
 
636
            if prop._dbus_access == u"write":
 
637
                continue
 
638
            value = prop()
 
639
            if not hasattr(value, u"variant_level"):
 
640
                all[name] = value
 
641
                continue
 
642
            all[name] = type(value)(value, variant_level=
 
643
                                    value.variant_level+1)
 
644
        return dbus.Dictionary(all, signature=u"sv")
 
645
    
 
646
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
647
                         out_signature=u"s",
 
648
                         path_keyword='object_path',
 
649
                         connection_keyword='connection')
 
650
    def Introspect(self, object_path, connection):
 
651
        """Standard D-Bus method, overloaded to insert property tags.
 
652
        """
 
653
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
654
                                                   connection)
 
655
        try:
 
656
            document = xml.dom.minidom.parseString(xmlstring)
 
657
            def make_tag(document, name, prop):
 
658
                e = document.createElement(u"property")
 
659
                e.setAttribute(u"name", name)
 
660
                e.setAttribute(u"type", prop._dbus_signature)
 
661
                e.setAttribute(u"access", prop._dbus_access)
 
662
                return e
 
663
            for if_tag in document.getElementsByTagName(u"interface"):
 
664
                for tag in (make_tag(document, name, prop)
 
665
                            for name, prop
 
666
                            in self._get_all_dbus_properties()
 
667
                            if prop._dbus_interface
 
668
                            == if_tag.getAttribute(u"name")):
 
669
                    if_tag.appendChild(tag)
 
670
                # Add the names to the return values for the
 
671
                # "org.freedesktop.DBus.Properties" methods
 
672
                if (if_tag.getAttribute(u"name")
 
673
                    == u"org.freedesktop.DBus.Properties"):
 
674
                    for cn in if_tag.getElementsByTagName(u"method"):
 
675
                        if cn.getAttribute(u"name") == u"Get":
 
676
                            for arg in cn.getElementsByTagName(u"arg"):
 
677
                                if (arg.getAttribute(u"direction")
 
678
                                    == u"out"):
 
679
                                    arg.setAttribute(u"name", u"value")
 
680
                        elif cn.getAttribute(u"name") == u"GetAll":
 
681
                            for arg in cn.getElementsByTagName(u"arg"):
 
682
                                if (arg.getAttribute(u"direction")
 
683
                                    == u"out"):
 
684
                                    arg.setAttribute(u"name", u"props")
 
685
            xmlstring = document.toxml(u"utf-8")
 
686
            document.unlink()
 
687
        except (AttributeError, xml.dom.DOMException,
 
688
                xml.parsers.expat.ExpatError), error:
 
689
            logger.error(u"Failed to override Introspection method",
 
690
                         error)
 
691
        return xmlstring
 
692
 
 
693
 
 
694
class ClientDBus(Client, DBusObjectWithProperties):
 
695
    """A Client class using D-Bus
 
696
    
 
697
    Attributes:
 
698
    dbus_object_path: dbus.ObjectPath
 
699
    bus: dbus.SystemBus()
 
700
    """
 
701
    # dbus.service.Object doesn't use super(), so we can't either.
 
702
    
 
703
    def __init__(self, bus = None, *args, **kwargs):
 
704
        self._approvals_pending = 0
 
705
        self.bus = bus
 
706
        Client.__init__(self, *args, **kwargs)
 
707
        # Only now, when this client is initialized, can it show up on
 
708
        # the D-Bus
 
709
        self.dbus_object_path = (dbus.ObjectPath
 
710
                                 (u"/clients/"
 
711
                                  + self.name.replace(u".", u"_")))
 
712
        DBusObjectWithProperties.__init__(self, self.bus,
 
713
                                          self.dbus_object_path)
 
714
 
 
715
    #Could possible return a bool(self._approvals_pending),
 
716
    #but this could mess up approvals_pending += 1 XXX 
 
717
    def _get_approvals_pending(self):
 
718
        return self._approvals_pending
 
719
    def _set_approvals_pending(self, value):
 
720
        old_value = self._approvals_pending
 
721
        self._approvals_pending = value
 
722
        bval = bool(value)
 
723
        if (hasattr(self, "dbus_object_path")
 
724
            and bval is not bool(old_value)):
 
725
            dbus_bool = dbus.Boolean(bval, variant_level=1)
 
726
            self.PropertyChanged(dbus.String(u"approved_pending"),
 
727
                                 dbus_bool)
 
728
 
 
729
    approvals_pending = property(_get_approvals_pending,
 
730
                                 _set_approvals_pending)
 
731
    del _get_approvals_pending, _set_approvals_pending
 
732
    
 
733
    @staticmethod
 
734
    def _datetime_to_dbus(dt, variant_level=0):
 
735
        """Convert a UTC datetime.datetime() to a D-Bus type."""
 
736
        return dbus.String(dt.isoformat(),
 
737
                           variant_level=variant_level)
 
738
    
 
739
    def enable(self):
 
740
        oldstate = getattr(self, u"enabled", False)
 
741
        r = Client.enable(self)
 
742
        if oldstate != self.enabled:
 
743
            # Emit D-Bus signals
 
744
            self.PropertyChanged(dbus.String(u"enabled"),
 
745
                                 dbus.Boolean(True, variant_level=1))
 
746
            self.PropertyChanged(
 
747
                dbus.String(u"last_enabled"),
 
748
                self._datetime_to_dbus(self.last_enabled,
 
749
                                       variant_level=1))
 
750
        return r
 
751
    
 
752
    def disable(self, quiet = False):
 
753
        oldstate = getattr(self, u"enabled", False)
 
754
        r = Client.disable(self, quiet=quiet)
 
755
        if not quiet and oldstate != self.enabled:
 
756
            # Emit D-Bus signal
 
757
            self.PropertyChanged(dbus.String(u"enabled"),
 
758
                                 dbus.Boolean(False, variant_level=1))
 
759
        return r
 
760
    
 
761
    def __del__(self, *args, **kwargs):
 
762
        try:
 
763
            self.remove_from_connection()
 
764
        except LookupError:
 
765
            pass
 
766
        if hasattr(DBusObjectWithProperties, u"__del__"):
 
767
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
768
        Client.__del__(self, *args, **kwargs)
 
769
    
 
770
    def checker_callback(self, pid, condition, command,
 
771
                         *args, **kwargs):
 
772
        self.checker_callback_tag = None
 
773
        self.checker = None
 
774
        # Emit D-Bus signal
 
775
        self.PropertyChanged(dbus.String(u"checker_running"),
 
776
                             dbus.Boolean(False, variant_level=1))
 
777
        if os.WIFEXITED(condition):
 
778
            exitstatus = os.WEXITSTATUS(condition)
 
779
            # Emit D-Bus signal
 
780
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
781
                                  dbus.Int64(condition),
 
782
                                  dbus.String(command))
 
783
        else:
 
784
            # Emit D-Bus signal
 
785
            self.CheckerCompleted(dbus.Int16(-1),
 
786
                                  dbus.Int64(condition),
 
787
                                  dbus.String(command))
 
788
        
 
789
        return Client.checker_callback(self, pid, condition, command,
 
790
                                       *args, **kwargs)
 
791
    
 
792
    def checked_ok(self, *args, **kwargs):
 
793
        r = Client.checked_ok(self, *args, **kwargs)
 
794
        # Emit D-Bus signal
 
795
        self.PropertyChanged(
 
796
            dbus.String(u"last_checked_ok"),
 
797
            (self._datetime_to_dbus(self.last_checked_ok,
 
798
                                    variant_level=1)))
 
799
        return r
 
800
    
 
801
    def start_checker(self, *args, **kwargs):
 
802
        old_checker = self.checker
 
803
        if self.checker is not None:
 
804
            old_checker_pid = self.checker.pid
 
805
        else:
 
806
            old_checker_pid = None
 
807
        r = Client.start_checker(self, *args, **kwargs)
 
808
        # Only if new checker process was started
 
809
        if (self.checker is not None
 
810
            and old_checker_pid != self.checker.pid):
 
811
            # Emit D-Bus signal
 
812
            self.CheckerStarted(self.current_checker_command)
 
813
            self.PropertyChanged(
 
814
                dbus.String(u"checker_running"),
 
815
                dbus.Boolean(True, variant_level=1))
 
816
        return r
 
817
    
 
818
    def stop_checker(self, *args, **kwargs):
 
819
        old_checker = getattr(self, u"checker", None)
 
820
        r = Client.stop_checker(self, *args, **kwargs)
 
821
        if (old_checker is not None
 
822
            and getattr(self, u"checker", None) is None):
 
823
            self.PropertyChanged(dbus.String(u"checker_running"),
 
824
                                 dbus.Boolean(False, variant_level=1))
 
825
        return r
 
826
 
 
827
    def _reset_approved(self):
 
828
        self._approved = None
 
829
        return False
 
830
    
 
831
    def approve(self, value=True):
 
832
        self.send_changedstate()
 
833
        self._approved = value
 
834
        gobject.timeout_add(self._timedelta_to_milliseconds(self.approved_duration),
 
835
                            self._reset_approved)
 
836
    
 
837
    
 
838
    ## D-Bus methods, signals & properties
 
839
    _interface = u"se.bsnet.fukt.Mandos.Client"
 
840
    
 
841
    ## Signals
 
842
    
 
843
    # CheckerCompleted - signal
 
844
    @dbus.service.signal(_interface, signature=u"nxs")
 
845
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
846
        "D-Bus signal"
 
847
        pass
 
848
    
 
849
    # CheckerStarted - signal
 
850
    @dbus.service.signal(_interface, signature=u"s")
 
851
    def CheckerStarted(self, command):
 
852
        "D-Bus signal"
 
853
        pass
 
854
    
 
855
    # PropertyChanged - signal
 
856
    @dbus.service.signal(_interface, signature=u"sv")
 
857
    def PropertyChanged(self, property, value):
 
858
        "D-Bus signal"
 
859
        pass
 
860
    
 
861
    # GotSecret - signal
 
862
    # XXXTEDDY Is sent after succesfull transfer of secret from mandos-server to mandos-client
 
863
    @dbus.service.signal(_interface)
 
864
    def GotSecret(self):
 
865
        "D-Bus signal"
 
866
        pass
 
867
    
 
868
    # Rejected - signal
 
869
    @dbus.service.signal(_interface, signature=u"s")
 
870
    def Rejected(self, reason):
 
871
        "D-Bus signal"
 
872
        pass
 
873
    
 
874
    # NeedApproval - signal
 
875
    @dbus.service.signal(_interface, signature=u"db")
 
876
    def NeedApproval(self, timeout, default):
 
877
        "D-Bus signal"
 
878
        pass
 
879
    
 
880
    ## Methods
 
881
 
 
882
    # Approve - method
 
883
    @dbus.service.method(_interface, in_signature=u"b")
 
884
    def Approve(self, value):
 
885
        self.approve(value)
 
886
 
 
887
    # CheckedOK - method
 
888
    @dbus.service.method(_interface)
 
889
    def CheckedOK(self):
 
890
        return self.checked_ok()
 
891
    
 
892
    # Enable - method
 
893
    @dbus.service.method(_interface)
 
894
    def Enable(self):
 
895
        "D-Bus method"
 
896
        self.enable()
 
897
    
 
898
    # StartChecker - method
 
899
    @dbus.service.method(_interface)
 
900
    def StartChecker(self):
 
901
        "D-Bus method"
 
902
        self.start_checker()
 
903
    
 
904
    # Disable - method
 
905
    @dbus.service.method(_interface)
 
906
    def Disable(self):
 
907
        "D-Bus method"
 
908
        self.disable()
 
909
    
 
910
    # StopChecker - method
 
911
    @dbus.service.method(_interface)
 
912
    def StopChecker(self):
 
913
        self.stop_checker()
 
914
    
 
915
    ## Properties
 
916
    
 
917
    # approved_pending - property
 
918
    @dbus_service_property(_interface, signature=u"b", access=u"read")
 
919
    def approved_pending_dbus_property(self):
 
920
        return dbus.Boolean(bool(self.approvals_pending))
 
921
    
 
922
    # approved_by_default - property
 
923
    @dbus_service_property(_interface, signature=u"b",
 
924
                           access=u"readwrite")
 
925
    def approved_by_default_dbus_property(self):
 
926
        return dbus.Boolean(self.approved_by_default)
 
927
    
 
928
    # approved_delay - property
 
929
    @dbus_service_property(_interface, signature=u"t",
 
930
                           access=u"readwrite")
 
931
    def approved_delay_dbus_property(self):
 
932
        return dbus.UInt64(self.approved_delay_milliseconds())
 
933
    
 
934
    # approved_duration - property
 
935
    @dbus_service_property(_interface, signature=u"t",
 
936
                           access=u"readwrite")
 
937
    def approved_duration_dbus_property(self):
 
938
        return dbus.UInt64(self._timedelta_to_milliseconds(
 
939
                self.approved_duration))
 
940
    
 
941
    # name - property
 
942
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
943
    def name_dbus_property(self):
 
944
        return dbus.String(self.name)
 
945
    
 
946
    # fingerprint - property
 
947
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
948
    def fingerprint_dbus_property(self):
 
949
        return dbus.String(self.fingerprint)
 
950
    
 
951
    # host - property
 
952
    @dbus_service_property(_interface, signature=u"s",
 
953
                           access=u"readwrite")
 
954
    def host_dbus_property(self, value=None):
 
955
        if value is None:       # get
 
956
            return dbus.String(self.host)
 
957
        self.host = value
 
958
        # Emit D-Bus signal
 
959
        self.PropertyChanged(dbus.String(u"host"),
 
960
                             dbus.String(value, variant_level=1))
 
961
    
 
962
    # created - property
 
963
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
964
    def created_dbus_property(self):
 
965
        return dbus.String(self._datetime_to_dbus(self.created))
 
966
    
 
967
    # last_enabled - property
 
968
    @dbus_service_property(_interface, signature=u"s", access=u"read")
 
969
    def last_enabled_dbus_property(self):
 
970
        if self.last_enabled is None:
 
971
            return dbus.String(u"")
 
972
        return dbus.String(self._datetime_to_dbus(self.last_enabled))
 
973
    
 
974
    # enabled - property
 
975
    @dbus_service_property(_interface, signature=u"b",
 
976
                           access=u"readwrite")
 
977
    def enabled_dbus_property(self, value=None):
 
978
        if value is None:       # get
 
979
            return dbus.Boolean(self.enabled)
 
980
        if value:
 
981
            self.enable()
 
982
        else:
 
983
            self.disable()
 
984
    
 
985
    # last_checked_ok - property
 
986
    @dbus_service_property(_interface, signature=u"s",
 
987
                           access=u"readwrite")
 
988
    def last_checked_ok_dbus_property(self, value=None):
 
989
        if value is not None:
 
990
            self.checked_ok()
 
991
            return
370
992
        if self.last_checked_ok is None:
371
 
            return now < (self.created + self.timeout)
372
 
        else:
373
 
            return now < (self.last_checked_ok + self.timeout)
374
 
 
375
 
 
376
 
def peer_certificate(session):
377
 
    "Return the peer's OpenPGP certificate as a bytestring"
378
 
    # If not an OpenPGP certificate...
379
 
    if gnutls.library.functions.gnutls_certificate_type_get\
380
 
            (session._c_object) \
381
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
382
 
        # ...do the normal thing
383
 
        return session.peer_certificate
384
 
    list_size = ctypes.c_uint()
385
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
386
 
        (session._c_object, ctypes.byref(list_size))
387
 
    if list_size.value == 0:
388
 
        return None
389
 
    cert = cert_list[0]
390
 
    return ctypes.string_at(cert.data, cert.size)
391
 
 
392
 
 
393
 
def fingerprint(openpgp):
394
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
395
 
    # New GnuTLS "datum" with the OpenPGP public key
396
 
    datum = gnutls.library.types.gnutls_datum_t\
397
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
398
 
                     ctypes.POINTER(ctypes.c_ubyte)),
399
 
         ctypes.c_uint(len(openpgp)))
400
 
    # New empty GnuTLS certificate
401
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
402
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
403
 
        (ctypes.byref(crt))
404
 
    # Import the OpenPGP public key into the certificate
405
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
406
 
                    (crt, ctypes.byref(datum),
407
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
408
 
    # New buffer for the fingerprint
409
 
    buffer = ctypes.create_string_buffer(20)
410
 
    buffer_length = ctypes.c_size_t()
411
 
    # Get the fingerprint from the certificate into the buffer
412
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
413
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
414
 
    # Deinit the certificate
415
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
416
 
    # Convert the buffer to a Python bytestring
417
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
418
 
    # Convert the bytestring to hexadecimal notation
419
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
420
 
    return hex_fpr
421
 
 
422
 
 
423
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
424
 
    """A TCP request handler class.
425
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
993
            return dbus.String(u"")
 
994
        return dbus.String(self._datetime_to_dbus(self
 
995
                                                  .last_checked_ok))
 
996
    
 
997
    # timeout - property
 
998
    @dbus_service_property(_interface, signature=u"t",
 
999
                           access=u"readwrite")
 
1000
    def timeout_dbus_property(self, value=None):
 
1001
        if value is None:       # get
 
1002
            return dbus.UInt64(self.timeout_milliseconds())
 
1003
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
1004
        # Emit D-Bus signal
 
1005
        self.PropertyChanged(dbus.String(u"timeout"),
 
1006
                             dbus.UInt64(value, variant_level=1))
 
1007
        if getattr(self, u"disable_initiator_tag", None) is None:
 
1008
            return
 
1009
        # Reschedule timeout
 
1010
        gobject.source_remove(self.disable_initiator_tag)
 
1011
        self.disable_initiator_tag = None
 
1012
        time_to_die = (self.
 
1013
                       _timedelta_to_milliseconds((self
 
1014
                                                   .last_checked_ok
 
1015
                                                   + self.timeout)
 
1016
                                                  - datetime.datetime
 
1017
                                                  .utcnow()))
 
1018
        if time_to_die <= 0:
 
1019
            # The timeout has passed
 
1020
            self.disable()
 
1021
        else:
 
1022
            self.disable_initiator_tag = (gobject.timeout_add
 
1023
                                          (time_to_die, self.disable))
 
1024
    
 
1025
    # interval - property
 
1026
    @dbus_service_property(_interface, signature=u"t",
 
1027
                           access=u"readwrite")
 
1028
    def interval_dbus_property(self, value=None):
 
1029
        if value is None:       # get
 
1030
            return dbus.UInt64(self.interval_milliseconds())
 
1031
        self.interval = datetime.timedelta(0, 0, 0, value)
 
1032
        # Emit D-Bus signal
 
1033
        self.PropertyChanged(dbus.String(u"interval"),
 
1034
                             dbus.UInt64(value, variant_level=1))
 
1035
        if getattr(self, u"checker_initiator_tag", None) is None:
 
1036
            return
 
1037
        # Reschedule checker run
 
1038
        gobject.source_remove(self.checker_initiator_tag)
 
1039
        self.checker_initiator_tag = (gobject.timeout_add
 
1040
                                      (value, self.start_checker))
 
1041
        self.start_checker()    # Start one now, too
 
1042
 
 
1043
    # checker - property
 
1044
    @dbus_service_property(_interface, signature=u"s",
 
1045
                           access=u"readwrite")
 
1046
    def checker_dbus_property(self, value=None):
 
1047
        if value is None:       # get
 
1048
            return dbus.String(self.checker_command)
 
1049
        self.checker_command = value
 
1050
        # Emit D-Bus signal
 
1051
        self.PropertyChanged(dbus.String(u"checker"),
 
1052
                             dbus.String(self.checker_command,
 
1053
                                         variant_level=1))
 
1054
    
 
1055
    # checker_running - property
 
1056
    @dbus_service_property(_interface, signature=u"b",
 
1057
                           access=u"readwrite")
 
1058
    def checker_running_dbus_property(self, value=None):
 
1059
        if value is None:       # get
 
1060
            return dbus.Boolean(self.checker is not None)
 
1061
        if value:
 
1062
            self.start_checker()
 
1063
        else:
 
1064
            self.stop_checker()
 
1065
    
 
1066
    # object_path - property
 
1067
    @dbus_service_property(_interface, signature=u"o", access=u"read")
 
1068
    def object_path_dbus_property(self):
 
1069
        return self.dbus_object_path # is already a dbus.ObjectPath
 
1070
    
 
1071
    # secret = property
 
1072
    @dbus_service_property(_interface, signature=u"ay",
 
1073
                           access=u"write", byte_arrays=True)
 
1074
    def secret_dbus_property(self, value):
 
1075
        self.secret = str(value)
 
1076
    
 
1077
    del _interface
 
1078
 
 
1079
 
 
1080
class ProxyClient(object):
 
1081
    def __init__(self, child_pipe, fpr, address):
 
1082
        self._pipe = child_pipe
 
1083
        self._pipe.send(('init', fpr, address))
 
1084
        if not self._pipe.recv():
 
1085
            raise KeyError()
 
1086
 
 
1087
    def __getattribute__(self, name):
 
1088
        if(name == '_pipe'):
 
1089
            return super(ProxyClient, self).__getattribute__(name)
 
1090
        self._pipe.send(('getattr', name))
 
1091
        data = self._pipe.recv()
 
1092
        if data[0] == 'data':
 
1093
            return data[1]
 
1094
        if data[0] == 'function':
 
1095
            def func(*args, **kwargs):
 
1096
                self._pipe.send(('funcall', name, args, kwargs))
 
1097
                return self._pipe.recv()[1]
 
1098
            return func
 
1099
 
 
1100
    def __setattr__(self, name, value):
 
1101
        if(name == '_pipe'):
 
1102
            return super(ProxyClient, self).__setattr__(name, value)
 
1103
        self._pipe.send(('setattr', name, value))
 
1104
 
 
1105
 
 
1106
class ClientHandler(socketserver.BaseRequestHandler, object):
 
1107
    """A class to handle client connections.
 
1108
    
 
1109
    Instantiated once for each connection to handle it.
426
1110
    Note: This will run in its own forked process."""
427
1111
    
428
1112
    def handle(self):
429
 
        logger.info(u"TCP connection from: %s",
430
 
                     unicode(self.client_address))
431
 
        session = gnutls.connection.ClientSession\
432
 
                  (self.request, gnutls.connection.X509Credentials())
433
 
        
434
 
        line = self.request.makefile().readline()
435
 
        logger.debug(u"Protocol version: %r", line)
436
 
        try:
437
 
            if int(line.strip().split()[0]) > 1:
438
 
                raise RuntimeError
439
 
        except (ValueError, IndexError, RuntimeError), error:
440
 
            logger.error(u"Unknown protocol version: %s", error)
441
 
            return
442
 
        
443
 
        # Note: gnutls.connection.X509Credentials is really a generic
444
 
        # GnuTLS certificate credentials object so long as no X.509
445
 
        # keys are added to it.  Therefore, we can use it here despite
446
 
        # using OpenPGP certificates.
447
 
        
448
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
449
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
450
 
        #                "+DHE-DSS"))
451
 
        priority = "NORMAL"             # Fallback default, since this
452
 
                                        # MUST be set.
453
 
        if self.server.settings["priority"]:
454
 
            priority = self.server.settings["priority"]
455
 
        gnutls.library.functions.gnutls_priority_set_direct\
456
 
            (session._c_object, priority, None);
457
 
        
458
 
        try:
459
 
            session.handshake()
460
 
        except gnutls.errors.GNUTLSError, error:
461
 
            logger.warning(u"Handshake failed: %s", error)
462
 
            # Do not run session.bye() here: the session is not
463
 
            # established.  Just abandon the request.
464
 
            return
465
 
        try:
466
 
            fpr = fingerprint(peer_certificate(session))
467
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
468
 
            logger.warning(u"Bad certificate: %s", error)
469
 
            session.bye()
470
 
            return
471
 
        logger.debug(u"Fingerprint: %s", fpr)
472
 
        client = None
473
 
        for c in self.server.clients:
474
 
            if c.fingerprint == fpr:
475
 
                client = c
476
 
                break
477
 
        if not client:
478
 
            logger.warning(u"Client not found for fingerprint: %s",
479
 
                           fpr)
480
 
            session.bye()
481
 
            return
482
 
        # Have to check if client.still_valid(), since it is possible
483
 
        # that the client timed out while establishing the GnuTLS
484
 
        # session.
485
 
        if not client.still_valid():
486
 
            logger.warning(u"Client %(name)s is invalid",
487
 
                           vars(client))
488
 
            session.bye()
489
 
            return
490
 
        sent_size = 0
491
 
        while sent_size < len(client.secret):
492
 
            sent = session.send(client.secret[sent_size:])
493
 
            logger.debug(u"Sent: %d, remaining: %d",
494
 
                         sent, len(client.secret)
495
 
                         - (sent_size + sent))
496
 
            sent_size += sent
497
 
        session.bye()
498
 
 
499
 
 
500
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
501
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
1113
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
1114
            logger.info(u"TCP connection from: %s",
 
1115
                        unicode(self.client_address))
 
1116
            logger.debug(u"Pipe FD: %d",
 
1117
                         self.server.child_pipe.fileno())
 
1118
 
 
1119
            session = (gnutls.connection
 
1120
                       .ClientSession(self.request,
 
1121
                                      gnutls.connection
 
1122
                                      .X509Credentials()))
 
1123
 
 
1124
            # Note: gnutls.connection.X509Credentials is really a
 
1125
            # generic GnuTLS certificate credentials object so long as
 
1126
            # no X.509 keys are added to it.  Therefore, we can use it
 
1127
            # here despite using OpenPGP certificates.
 
1128
 
 
1129
            #priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
 
1130
            #                      u"+AES-256-CBC", u"+SHA1",
 
1131
            #                      u"+COMP-NULL", u"+CTYPE-OPENPGP",
 
1132
            #                      u"+DHE-DSS"))
 
1133
            # Use a fallback default, since this MUST be set.
 
1134
            priority = self.server.gnutls_priority
 
1135
            if priority is None:
 
1136
                priority = u"NORMAL"
 
1137
            (gnutls.library.functions
 
1138
             .gnutls_priority_set_direct(session._c_object,
 
1139
                                         priority, None))
 
1140
 
 
1141
            # Start communication using the Mandos protocol
 
1142
            # Get protocol number
 
1143
            line = self.request.makefile().readline()
 
1144
            logger.debug(u"Protocol version: %r", line)
 
1145
            try:
 
1146
                if int(line.strip().split()[0]) > 1:
 
1147
                    raise RuntimeError
 
1148
            except (ValueError, IndexError, RuntimeError), error:
 
1149
                logger.error(u"Unknown protocol version: %s", error)
 
1150
                return
 
1151
 
 
1152
            # Start GnuTLS connection
 
1153
            try:
 
1154
                session.handshake()
 
1155
            except gnutls.errors.GNUTLSError, error:
 
1156
                logger.warning(u"Handshake failed: %s", error)
 
1157
                # Do not run session.bye() here: the session is not
 
1158
                # established.  Just abandon the request.
 
1159
                return
 
1160
            logger.debug(u"Handshake succeeded")
 
1161
 
 
1162
            approval_required = False
 
1163
            try:
 
1164
                try:
 
1165
                    fpr = self.fingerprint(self.peer_certificate
 
1166
                                           (session))
 
1167
                except (TypeError, gnutls.errors.GNUTLSError), error:
 
1168
                    logger.warning(u"Bad certificate: %s", error)
 
1169
                    return
 
1170
                logger.debug(u"Fingerprint: %s", fpr)
 
1171
 
 
1172
                try:
 
1173
                    client = ProxyClient(child_pipe, fpr,
 
1174
                                         self.client_address)
 
1175
                except KeyError:
 
1176
                    return
 
1177
                
 
1178
                if client.approved_delay:
 
1179
                    delay = client.approved_delay
 
1180
                    client.approvals_pending += 1
 
1181
                    approval_required = True
 
1182
                
 
1183
                while True:
 
1184
                    if not client.enabled:
 
1185
                        logger.warning(u"Client %s is disabled",
 
1186
                                       client.name)
 
1187
                        if self.server.use_dbus:
 
1188
                            # Emit D-Bus signal
 
1189
                            client.Rejected("Disabled")                    
 
1190
                        return
 
1191
                    
 
1192
                    if client._approved or not client.approved_delay:
 
1193
                        #We are approved or approval is disabled
 
1194
                        break
 
1195
                    elif client._approved is None:
 
1196
                        logger.info(u"Client %s need approval",
 
1197
                                    client.name)
 
1198
                        if self.server.use_dbus:
 
1199
                            # Emit D-Bus signal
 
1200
                            client.NeedApproval(
 
1201
                                client.approved_delay_milliseconds(),
 
1202
                                client.approved_by_default)
 
1203
                    else:
 
1204
                        logger.warning(u"Client %s was not approved",
 
1205
                                       client.name)
 
1206
                        if self.server.use_dbus:
 
1207
                            # Emit D-Bus signal
 
1208
                            client.Rejected("Disapproved")
 
1209
                        return
 
1210
                    
 
1211
                    #wait until timeout or approved
 
1212
                    #x = float(client._timedelta_to_milliseconds(delay))
 
1213
                    time = datetime.datetime.now()
 
1214
                    client.changedstate.acquire()
 
1215
                    client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
 
1216
                    client.changedstate.release()
 
1217
                    time2 = datetime.datetime.now()
 
1218
                    if (time2 - time) >= delay:
 
1219
                        if not client.approved_by_default:
 
1220
                            logger.warning("Client %s timed out while"
 
1221
                                           " waiting for approval",
 
1222
                                           client.name)
 
1223
                            if self.server.use_dbus:
 
1224
                                # Emit D-Bus signal
 
1225
                                client.Rejected("Time out")
 
1226
                            return
 
1227
                        else:
 
1228
                            break
 
1229
                    else:
 
1230
                        delay -= time2 - time
 
1231
                
 
1232
                sent_size = 0
 
1233
                while sent_size < len(client.secret):
 
1234
                    # XXX handle session exception
 
1235
                    sent = session.send(client.secret[sent_size:])
 
1236
                    logger.debug(u"Sent: %d, remaining: %d",
 
1237
                                 sent, len(client.secret)
 
1238
                                 - (sent_size + sent))
 
1239
                    sent_size += sent
 
1240
 
 
1241
                logger.info(u"Sending secret to %s", client.name)
 
1242
                # bump the timeout as if seen
 
1243
                client.checked_ok()
 
1244
                if self.server.use_dbus:
 
1245
                    # Emit D-Bus signal
 
1246
                    client.GotSecret()
 
1247
            
 
1248
            finally:
 
1249
                if approval_required:
 
1250
                    client.approvals_pending -= 1
 
1251
                session.bye()
 
1252
    
 
1253
    @staticmethod
 
1254
    def peer_certificate(session):
 
1255
        "Return the peer's OpenPGP certificate as a bytestring"
 
1256
        # If not an OpenPGP certificate...
 
1257
        if (gnutls.library.functions
 
1258
            .gnutls_certificate_type_get(session._c_object)
 
1259
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
1260
            # ...do the normal thing
 
1261
            return session.peer_certificate
 
1262
        list_size = ctypes.c_uint(1)
 
1263
        cert_list = (gnutls.library.functions
 
1264
                     .gnutls_certificate_get_peers
 
1265
                     (session._c_object, ctypes.byref(list_size)))
 
1266
        if not bool(cert_list) and list_size.value != 0:
 
1267
            raise gnutls.errors.GNUTLSError(u"error getting peer"
 
1268
                                            u" certificate")
 
1269
        if list_size.value == 0:
 
1270
            return None
 
1271
        cert = cert_list[0]
 
1272
        return ctypes.string_at(cert.data, cert.size)
 
1273
    
 
1274
    @staticmethod
 
1275
    def fingerprint(openpgp):
 
1276
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
1277
        # New GnuTLS "datum" with the OpenPGP public key
 
1278
        datum = (gnutls.library.types
 
1279
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
1280
                                             ctypes.POINTER
 
1281
                                             (ctypes.c_ubyte)),
 
1282
                                 ctypes.c_uint(len(openpgp))))
 
1283
        # New empty GnuTLS certificate
 
1284
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
1285
        (gnutls.library.functions
 
1286
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
1287
        # Import the OpenPGP public key into the certificate
 
1288
        (gnutls.library.functions
 
1289
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
1290
                                    gnutls.library.constants
 
1291
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
1292
        # Verify the self signature in the key
 
1293
        crtverify = ctypes.c_uint()
 
1294
        (gnutls.library.functions
 
1295
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
1296
                                         ctypes.byref(crtverify)))
 
1297
        if crtverify.value != 0:
 
1298
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1299
            raise (gnutls.errors.CertificateSecurityError
 
1300
                   (u"Verify failed"))
 
1301
        # New buffer for the fingerprint
 
1302
        buf = ctypes.create_string_buffer(20)
 
1303
        buf_len = ctypes.c_size_t()
 
1304
        # Get the fingerprint from the certificate into the buffer
 
1305
        (gnutls.library.functions
 
1306
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
1307
                                             ctypes.byref(buf_len)))
 
1308
        # Deinit the certificate
 
1309
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1310
        # Convert the buffer to a Python bytestring
 
1311
        fpr = ctypes.string_at(buf, buf_len.value)
 
1312
        # Convert the bytestring to hexadecimal notation
 
1313
        hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
1314
        return hex_fpr
 
1315
 
 
1316
 
 
1317
class MultiprocessingMixIn(object):
 
1318
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
1319
    def sub_process_main(self, request, address):
 
1320
        try:
 
1321
            self.finish_request(request, address)
 
1322
        except:
 
1323
            self.handle_error(request, address)
 
1324
        self.close_request(request)
 
1325
            
 
1326
    def process_request(self, request, address):
 
1327
        """Start a new process to process the request."""
 
1328
        multiprocessing.Process(target = self.sub_process_main,
 
1329
                                args = (request, address)).start()
 
1330
 
 
1331
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
1332
    """ adds a pipe to the MixIn """
 
1333
    def process_request(self, request, client_address):
 
1334
        """Overrides and wraps the original process_request().
 
1335
        
 
1336
        This function creates a new pipe in self.pipe
 
1337
        """
 
1338
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
1339
 
 
1340
        super(MultiprocessingMixInWithPipe,
 
1341
              self).process_request(request, client_address)
 
1342
        self.child_pipe.close()
 
1343
        self.add_pipe(parent_pipe)
 
1344
 
 
1345
    def add_pipe(self, parent_pipe):
 
1346
        """Dummy function; override as necessary"""
 
1347
        pass
 
1348
 
 
1349
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
1350
                     socketserver.TCPServer, object):
 
1351
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
1352
    
502
1353
    Attributes:
503
 
        settings:       Server settings
504
 
        clients:        Set() of Client objects
 
1354
        enabled:        Boolean; whether this server is activated yet
 
1355
        interface:      None or a network interface name (string)
 
1356
        use_ipv6:       Boolean; to use IPv6 or not
505
1357
    """
506
 
    address_family = socket.AF_INET6
507
 
    def __init__(self, *args, **kwargs):
508
 
        if "settings" in kwargs:
509
 
            self.settings = kwargs["settings"]
510
 
            del kwargs["settings"]
511
 
        if "clients" in kwargs:
512
 
            self.clients = kwargs["clients"]
513
 
            del kwargs["clients"]
514
 
        return super(type(self), self).__init__(*args, **kwargs)
 
1358
    def __init__(self, server_address, RequestHandlerClass,
 
1359
                 interface=None, use_ipv6=True):
 
1360
        self.interface = interface
 
1361
        if use_ipv6:
 
1362
            self.address_family = socket.AF_INET6
 
1363
        socketserver.TCPServer.__init__(self, server_address,
 
1364
                                        RequestHandlerClass)
515
1365
    def server_bind(self):
516
1366
        """This overrides the normal server_bind() function
517
1367
        to bind to an interface if one was specified, and also NOT to
518
1368
        bind to an address or port if they were not specified."""
519
 
        if self.settings["interface"]:
520
 
            # 25 is from /usr/include/asm-i486/socket.h
521
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
522
 
            try:
523
 
                self.socket.setsockopt(socket.SOL_SOCKET,
524
 
                                       SO_BINDTODEVICE,
525
 
                                       self.settings["interface"])
526
 
            except socket.error, error:
527
 
                if error[0] == errno.EPERM:
528
 
                    logger.error(u"No permission to"
529
 
                                 u" bind to interface %s",
530
 
                                 self.settings["interface"])
531
 
                else:
532
 
                    raise error
 
1369
        if self.interface is not None:
 
1370
            if SO_BINDTODEVICE is None:
 
1371
                logger.error(u"SO_BINDTODEVICE does not exist;"
 
1372
                             u" cannot bind to interface %s",
 
1373
                             self.interface)
 
1374
            else:
 
1375
                try:
 
1376
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
1377
                                           SO_BINDTODEVICE,
 
1378
                                           str(self.interface
 
1379
                                               + u'\0'))
 
1380
                except socket.error, error:
 
1381
                    if error[0] == errno.EPERM:
 
1382
                        logger.error(u"No permission to"
 
1383
                                     u" bind to interface %s",
 
1384
                                     self.interface)
 
1385
                    elif error[0] == errno.ENOPROTOOPT:
 
1386
                        logger.error(u"SO_BINDTODEVICE not available;"
 
1387
                                     u" cannot bind to interface %s",
 
1388
                                     self.interface)
 
1389
                    else:
 
1390
                        raise
533
1391
        # Only bind(2) the socket if we really need to.
534
1392
        if self.server_address[0] or self.server_address[1]:
535
1393
            if not self.server_address[0]:
536
 
                in6addr_any = "::"
537
 
                self.server_address = (in6addr_any,
 
1394
                if self.address_family == socket.AF_INET6:
 
1395
                    any_address = u"::" # in6addr_any
 
1396
                else:
 
1397
                    any_address = socket.INADDR_ANY
 
1398
                self.server_address = (any_address,
538
1399
                                       self.server_address[1])
539
1400
            elif not self.server_address[1]:
540
1401
                self.server_address = (self.server_address[0],
541
1402
                                       0)
542
 
#                 if self.settings["interface"]:
 
1403
#                 if self.interface:
543
1404
#                     self.server_address = (self.server_address[0],
544
1405
#                                            0, # port
545
1406
#                                            0, # flowinfo
546
1407
#                                            if_nametoindex
547
 
#                                            (self.settings
548
 
#                                             ["interface"]))
549
 
            return super(type(self), self).server_bind()
 
1408
#                                            (self.interface))
 
1409
            return socketserver.TCPServer.server_bind(self)
 
1410
 
 
1411
 
 
1412
class MandosServer(IPv6_TCPServer):
 
1413
    """Mandos server.
 
1414
    
 
1415
    Attributes:
 
1416
        clients:        set of Client objects
 
1417
        gnutls_priority GnuTLS priority string
 
1418
        use_dbus:       Boolean; to emit D-Bus signals or not
 
1419
    
 
1420
    Assumes a gobject.MainLoop event loop.
 
1421
    """
 
1422
    def __init__(self, server_address, RequestHandlerClass,
 
1423
                 interface=None, use_ipv6=True, clients=None,
 
1424
                 gnutls_priority=None, use_dbus=True):
 
1425
        self.enabled = False
 
1426
        self.clients = clients
 
1427
        if self.clients is None:
 
1428
            self.clients = set()
 
1429
        self.use_dbus = use_dbus
 
1430
        self.gnutls_priority = gnutls_priority
 
1431
        IPv6_TCPServer.__init__(self, server_address,
 
1432
                                RequestHandlerClass,
 
1433
                                interface = interface,
 
1434
                                use_ipv6 = use_ipv6)
 
1435
    def server_activate(self):
 
1436
        if self.enabled:
 
1437
            return socketserver.TCPServer.server_activate(self)
 
1438
    def enable(self):
 
1439
        self.enabled = True
 
1440
    def add_pipe(self, parent_pipe):
 
1441
        # Call "handle_ipc" for both data and EOF events
 
1442
        gobject.io_add_watch(parent_pipe.fileno(),
 
1443
                             gobject.IO_IN | gobject.IO_HUP,
 
1444
                             functools.partial(self.handle_ipc,
 
1445
                                               parent_pipe = parent_pipe))
 
1446
        
 
1447
    def handle_ipc(self, source, condition, parent_pipe=None,
 
1448
                   client_object=None):
 
1449
        condition_names = {
 
1450
            gobject.IO_IN: u"IN",   # There is data to read.
 
1451
            gobject.IO_OUT: u"OUT", # Data can be written (without
 
1452
                                    # blocking).
 
1453
            gobject.IO_PRI: u"PRI", # There is urgent data to read.
 
1454
            gobject.IO_ERR: u"ERR", # Error condition.
 
1455
            gobject.IO_HUP: u"HUP"  # Hung up (the connection has been
 
1456
                                    # broken, usually for pipes and
 
1457
                                    # sockets).
 
1458
            }
 
1459
        conditions_string = ' | '.join(name
 
1460
                                       for cond, name in
 
1461
                                       condition_names.iteritems()
 
1462
                                       if cond & condition)
 
1463
        logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
 
1464
                     conditions_string)
 
1465
 
 
1466
        # XXXTEDDY error or the other end of multiprocessing.Pipe has closed
 
1467
        if condition & gobject.IO_HUP or condition & gobject.IO_ERR:
 
1468
            return False
 
1469
        
 
1470
        # Read a request from the child
 
1471
        request = parent_pipe.recv()
 
1472
        logger.debug(u"IPC request: %s", repr(request))
 
1473
        command = request[0]
 
1474
        
 
1475
        if command == 'init':
 
1476
            fpr = request[1]
 
1477
            address = request[2]
 
1478
            
 
1479
            for c in self.clients:
 
1480
                if c.fingerprint == fpr:
 
1481
                    client = c
 
1482
                    break
 
1483
            else:
 
1484
                logger.warning(u"Client not found for fingerprint: %s, ad"
 
1485
                               u"dress: %s", fpr, address)
 
1486
                if self.use_dbus:
 
1487
                    # Emit D-Bus signal
 
1488
                    mandos_dbus_service.ClientNotFound(fpr, address)
 
1489
                parent_pipe.send(False)
 
1490
                return False
 
1491
            
 
1492
            gobject.io_add_watch(parent_pipe.fileno(),
 
1493
                                 gobject.IO_IN | gobject.IO_HUP,
 
1494
                                 functools.partial(self.handle_ipc,
 
1495
                                                   parent_pipe = parent_pipe,
 
1496
                                                   client_object = client))
 
1497
            parent_pipe.send(True)
 
1498
            # remove the old hook in favor of the new above hook on same fileno
 
1499
            return False
 
1500
        if command == 'funcall':
 
1501
            funcname = request[1]
 
1502
            args = request[2]
 
1503
            kwargs = request[3]
 
1504
            
 
1505
            parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
 
1506
 
 
1507
        if command == 'getattr':
 
1508
            attrname = request[1]
 
1509
            if callable(client_object.__getattribute__(attrname)):
 
1510
                parent_pipe.send(('function',))
 
1511
            else:
 
1512
                parent_pipe.send(('data', client_object.__getattribute__(attrname)))
 
1513
        
 
1514
        if command == 'setattr':
 
1515
            attrname = request[1]
 
1516
            value = request[2]
 
1517
            setattr(client_object, attrname, value)
 
1518
 
 
1519
        return True
550
1520
 
551
1521
 
552
1522
def string_to_delta(interval):
553
1523
    """Parse a string and return a datetime.timedelta
554
 
 
555
 
    >>> string_to_delta('7d')
 
1524
    
 
1525
    >>> string_to_delta(u'7d')
556
1526
    datetime.timedelta(7)
557
 
    >>> string_to_delta('60s')
 
1527
    >>> string_to_delta(u'60s')
558
1528
    datetime.timedelta(0, 60)
559
 
    >>> string_to_delta('60m')
 
1529
    >>> string_to_delta(u'60m')
560
1530
    datetime.timedelta(0, 3600)
561
 
    >>> string_to_delta('24h')
 
1531
    >>> string_to_delta(u'24h')
562
1532
    datetime.timedelta(1)
563
1533
    >>> string_to_delta(u'1w')
564
1534
    datetime.timedelta(7)
 
1535
    >>> string_to_delta(u'5m 30s')
 
1536
    datetime.timedelta(0, 330)
565
1537
    """
566
 
    try:
567
 
        suffix=unicode(interval[-1])
568
 
        value=int(interval[:-1])
569
 
        if suffix == u"d":
570
 
            delta = datetime.timedelta(value)
571
 
        elif suffix == u"s":
572
 
            delta = datetime.timedelta(0, value)
573
 
        elif suffix == u"m":
574
 
            delta = datetime.timedelta(0, 0, 0, 0, value)
575
 
        elif suffix == u"h":
576
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
577
 
        elif suffix == u"w":
578
 
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
579
 
        else:
580
 
            raise ValueError
581
 
    except (ValueError, IndexError):
582
 
        raise ValueError
583
 
    return delta
584
 
 
585
 
 
586
 
def server_state_changed(state):
587
 
    """Derived from the Avahi example code"""
588
 
    if state == avahi.SERVER_COLLISION:
589
 
        logger.error(u"Server name collision")
590
 
        service.remove()
591
 
    elif state == avahi.SERVER_RUNNING:
592
 
        service.add()
593
 
 
594
 
 
595
 
def entry_group_state_changed(state, error):
596
 
    """Derived from the Avahi example code"""
597
 
    logger.debug(u"state change: %i", state)
598
 
    
599
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
600
 
        logger.debug(u"Service established.")
601
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
602
 
        logger.warning(u"Service name collision.")
603
 
        service.rename()
604
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
605
 
        logger.critical(u"Error in group state changed %s",
606
 
                        unicode(error))
607
 
        raise AvahiGroupError("State changed: %s", str(error))
 
1538
    timevalue = datetime.timedelta(0)
 
1539
    for s in interval.split():
 
1540
        try:
 
1541
            suffix = unicode(s[-1])
 
1542
            value = int(s[:-1])
 
1543
            if suffix == u"d":
 
1544
                delta = datetime.timedelta(value)
 
1545
            elif suffix == u"s":
 
1546
                delta = datetime.timedelta(0, value)
 
1547
            elif suffix == u"m":
 
1548
                delta = datetime.timedelta(0, 0, 0, 0, value)
 
1549
            elif suffix == u"h":
 
1550
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
1551
            elif suffix == u"w":
 
1552
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
1553
            else:
 
1554
                raise ValueError(u"Unknown suffix %r" % suffix)
 
1555
        except (ValueError, IndexError), e:
 
1556
            raise ValueError(e.message)
 
1557
        timevalue += delta
 
1558
    return timevalue
 
1559
 
608
1560
 
609
1561
def if_nametoindex(interface):
610
 
    """Call the C function if_nametoindex(), or equivalent"""
 
1562
    """Call the C function if_nametoindex(), or equivalent
 
1563
    
 
1564
    Note: This function cannot accept a unicode string."""
611
1565
    global if_nametoindex
612
1566
    try:
613
 
        if "ctypes.util" not in sys.modules:
614
 
            import ctypes.util
615
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
616
 
            (ctypes.util.find_library("c")).if_nametoindex
 
1567
        if_nametoindex = (ctypes.cdll.LoadLibrary
 
1568
                          (ctypes.util.find_library(u"c"))
 
1569
                          .if_nametoindex)
617
1570
    except (OSError, AttributeError):
618
 
        if "struct" not in sys.modules:
619
 
            import struct
620
 
        if "fcntl" not in sys.modules:
621
 
            import fcntl
 
1571
        logger.warning(u"Doing if_nametoindex the hard way")
622
1572
        def if_nametoindex(interface):
623
1573
            "Get an interface index the hard way, i.e. using fcntl()"
624
1574
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
625
 
            s = socket.socket()
626
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
627
 
                                struct.pack("16s16x", interface))
628
 
            s.close()
629
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
 
1575
            with contextlib.closing(socket.socket()) as s:
 
1576
                ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
1577
                                    struct.pack(str(u"16s16x"),
 
1578
                                                interface))
 
1579
            interface_index = struct.unpack(str(u"I"),
 
1580
                                            ifreq[16:20])[0]
630
1581
            return interface_index
631
1582
    return if_nametoindex(interface)
632
1583
 
633
1584
 
634
1585
def daemon(nochdir = False, noclose = False):
635
1586
    """See daemon(3).  Standard BSD Unix function.
 
1587
    
636
1588
    This should really exist as os.daemon, but it doesn't (yet)."""
637
1589
    if os.fork():
638
1590
        sys.exit()
639
1591
    os.setsid()
640
1592
    if not nochdir:
641
 
        os.chdir("/")
 
1593
        os.chdir(u"/")
642
1594
    if os.fork():
643
1595
        sys.exit()
644
1596
    if not noclose:
646
1598
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
647
1599
        if not stat.S_ISCHR(os.fstat(null).st_mode):
648
1600
            raise OSError(errno.ENODEV,
649
 
                          "/dev/null not a character device")
 
1601
                          u"%s not a character device"
 
1602
                          % os.path.devnull)
650
1603
        os.dup2(null, sys.stdin.fileno())
651
1604
        os.dup2(null, sys.stdout.fileno())
652
1605
        os.dup2(null, sys.stderr.fileno())
655
1608
 
656
1609
 
657
1610
def main():
658
 
    global main_loop_started
659
 
    main_loop_started = False
660
 
    
661
 
    parser = OptionParser(version = "%%prog %s" % version)
662
 
    parser.add_option("-i", "--interface", type="string",
663
 
                      metavar="IF", help="Bind to interface IF")
664
 
    parser.add_option("-a", "--address", type="string",
665
 
                      help="Address to listen for requests on")
666
 
    parser.add_option("-p", "--port", type="int",
667
 
                      help="Port number to receive requests on")
668
 
    parser.add_option("--check", action="store_true", default=False,
669
 
                      help="Run self-test")
670
 
    parser.add_option("--debug", action="store_true",
671
 
                      help="Debug mode; run in foreground and log to"
672
 
                      " terminal")
673
 
    parser.add_option("--priority", type="string", help="GnuTLS"
674
 
                      " priority string (see GnuTLS documentation)")
675
 
    parser.add_option("--servicename", type="string", metavar="NAME",
676
 
                      help="Zeroconf service name")
677
 
    parser.add_option("--configdir", type="string",
678
 
                      default="/etc/mandos", metavar="DIR",
679
 
                      help="Directory to search for configuration"
680
 
                      " files")
681
 
    (options, args) = parser.parse_args()
 
1611
    
 
1612
    ##################################################################
 
1613
    # Parsing of options, both command line and config file
 
1614
    
 
1615
    parser = optparse.OptionParser(version = "%%prog %s" % version)
 
1616
    parser.add_option("-i", u"--interface", type=u"string",
 
1617
                      metavar="IF", help=u"Bind to interface IF")
 
1618
    parser.add_option("-a", u"--address", type=u"string",
 
1619
                      help=u"Address to listen for requests on")
 
1620
    parser.add_option("-p", u"--port", type=u"int",
 
1621
                      help=u"Port number to receive requests on")
 
1622
    parser.add_option("--check", action=u"store_true",
 
1623
                      help=u"Run self-test")
 
1624
    parser.add_option("--debug", action=u"store_true",
 
1625
                      help=u"Debug mode; run in foreground and log to"
 
1626
                      u" terminal")
 
1627
    parser.add_option("--priority", type=u"string", help=u"GnuTLS"
 
1628
                      u" priority string (see GnuTLS documentation)")
 
1629
    parser.add_option("--servicename", type=u"string",
 
1630
                      metavar=u"NAME", help=u"Zeroconf service name")
 
1631
    parser.add_option("--configdir", type=u"string",
 
1632
                      default=u"/etc/mandos", metavar=u"DIR",
 
1633
                      help=u"Directory to search for configuration"
 
1634
                      u" files")
 
1635
    parser.add_option("--no-dbus", action=u"store_false",
 
1636
                      dest=u"use_dbus", help=u"Do not provide D-Bus"
 
1637
                      u" system bus interface")
 
1638
    parser.add_option("--no-ipv6", action=u"store_false",
 
1639
                      dest=u"use_ipv6", help=u"Do not use IPv6")
 
1640
    options = parser.parse_args()[0]
682
1641
    
683
1642
    if options.check:
684
1643
        import doctest
686
1645
        sys.exit()
687
1646
    
688
1647
    # Default values for config file for server-global settings
689
 
    server_defaults = { "interface": "",
690
 
                        "address": "",
691
 
                        "port": "",
692
 
                        "debug": "False",
693
 
                        "priority":
694
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
695
 
                        "servicename": "Mandos",
 
1648
    server_defaults = { u"interface": u"",
 
1649
                        u"address": u"",
 
1650
                        u"port": u"",
 
1651
                        u"debug": u"False",
 
1652
                        u"priority":
 
1653
                        u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
 
1654
                        u"servicename": u"Mandos",
 
1655
                        u"use_dbus": u"True",
 
1656
                        u"use_ipv6": u"True",
696
1657
                        }
697
1658
    
698
1659
    # Parse config file for server-global settings
699
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
1660
    server_config = configparser.SafeConfigParser(server_defaults)
700
1661
    del server_defaults
701
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
702
 
    server_section = "server"
 
1662
    server_config.read(os.path.join(options.configdir,
 
1663
                                    u"mandos.conf"))
703
1664
    # Convert the SafeConfigParser object to a dict
704
 
    server_settings = dict(server_config.items(server_section))
705
 
    # Use getboolean on the boolean config option
706
 
    server_settings["debug"] = server_config.getboolean\
707
 
                               (server_section, "debug")
 
1665
    server_settings = server_config.defaults()
 
1666
    # Use the appropriate methods on the non-string config options
 
1667
    for option in (u"debug", u"use_dbus", u"use_ipv6"):
 
1668
        server_settings[option] = server_config.getboolean(u"DEFAULT",
 
1669
                                                           option)
 
1670
    if server_settings["port"]:
 
1671
        server_settings["port"] = server_config.getint(u"DEFAULT",
 
1672
                                                       u"port")
708
1673
    del server_config
709
1674
    
710
1675
    # Override the settings from the config file with command line
711
1676
    # options, if set.
712
 
    for option in ("interface", "address", "port", "debug",
713
 
                   "priority", "servicename", "configdir"):
 
1677
    for option in (u"interface", u"address", u"port", u"debug",
 
1678
                   u"priority", u"servicename", u"configdir",
 
1679
                   u"use_dbus", u"use_ipv6"):
714
1680
        value = getattr(options, option)
715
1681
        if value is not None:
716
1682
            server_settings[option] = value
717
1683
    del options
 
1684
    # Force all strings to be unicode
 
1685
    for option in server_settings.keys():
 
1686
        if type(server_settings[option]) is str:
 
1687
            server_settings[option] = unicode(server_settings[option])
718
1688
    # Now we have our good server settings in "server_settings"
719
1689
    
720
 
    debug = server_settings["debug"]
 
1690
    ##################################################################
 
1691
    
 
1692
    # For convenience
 
1693
    debug = server_settings[u"debug"]
 
1694
    use_dbus = server_settings[u"use_dbus"]
 
1695
    use_ipv6 = server_settings[u"use_ipv6"]
721
1696
    
722
1697
    if not debug:
723
1698
        syslogger.setLevel(logging.WARNING)
724
1699
        console.setLevel(logging.WARNING)
725
1700
    
726
 
    if server_settings["servicename"] != "Mandos":
727
 
        syslogger.setFormatter(logging.Formatter\
728
 
                               ('Mandos (%s): %%(levelname)s:'
729
 
                                ' %%(message)s'
730
 
                                % server_settings["servicename"]))
 
1701
    if server_settings[u"servicename"] != u"Mandos":
 
1702
        syslogger.setFormatter(logging.Formatter
 
1703
                               (u'Mandos (%s) [%%(process)d]:'
 
1704
                                u' %%(levelname)s: %%(message)s'
 
1705
                                % server_settings[u"servicename"]))
731
1706
    
732
1707
    # Parse config file with clients
733
 
    client_defaults = { "timeout": "1h",
734
 
                        "interval": "5m",
735
 
                        "checker": "fping -q -- %%(host)s",
 
1708
    client_defaults = { u"timeout": u"1h",
 
1709
                        u"interval": u"5m",
 
1710
                        u"checker": u"fping -q -- %%(host)s",
 
1711
                        u"host": u"",
 
1712
                        u"approved_delay": u"0s",
 
1713
                        u"approved_duration": u"1s",
736
1714
                        }
737
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
738
 
    client_config.read(os.path.join(server_settings["configdir"],
739
 
                                    "clients.conf"))
740
 
    
741
 
    global service
742
 
    service = AvahiService(name = server_settings["servicename"],
743
 
                           type = "_mandos._tcp", );
744
 
    if server_settings["interface"]:
745
 
        service.interface = if_nametoindex(server_settings["interface"])
 
1715
    client_config = configparser.SafeConfigParser(client_defaults)
 
1716
    client_config.read(os.path.join(server_settings[u"configdir"],
 
1717
                                    u"clients.conf"))
 
1718
    
 
1719
    global mandos_dbus_service
 
1720
    mandos_dbus_service = None
 
1721
    
 
1722
    tcp_server = MandosServer((server_settings[u"address"],
 
1723
                               server_settings[u"port"]),
 
1724
                              ClientHandler,
 
1725
                              interface=server_settings[u"interface"],
 
1726
                              use_ipv6=use_ipv6,
 
1727
                              gnutls_priority=
 
1728
                              server_settings[u"priority"],
 
1729
                              use_dbus=use_dbus)
 
1730
    pidfilename = u"/var/run/mandos.pid"
 
1731
    try:
 
1732
        pidfile = open(pidfilename, u"w")
 
1733
    except IOError:
 
1734
        logger.error(u"Could not open file %r", pidfilename)
 
1735
    
 
1736
    try:
 
1737
        uid = pwd.getpwnam(u"_mandos").pw_uid
 
1738
        gid = pwd.getpwnam(u"_mandos").pw_gid
 
1739
    except KeyError:
 
1740
        try:
 
1741
            uid = pwd.getpwnam(u"mandos").pw_uid
 
1742
            gid = pwd.getpwnam(u"mandos").pw_gid
 
1743
        except KeyError:
 
1744
            try:
 
1745
                uid = pwd.getpwnam(u"nobody").pw_uid
 
1746
                gid = pwd.getpwnam(u"nobody").pw_gid
 
1747
            except KeyError:
 
1748
                uid = 65534
 
1749
                gid = 65534
 
1750
    try:
 
1751
        os.setgid(gid)
 
1752
        os.setuid(uid)
 
1753
    except OSError, error:
 
1754
        if error[0] != errno.EPERM:
 
1755
            raise error
 
1756
    
 
1757
    # Enable all possible GnuTLS debugging
 
1758
    if debug:
 
1759
        # "Use a log level over 10 to enable all debugging options."
 
1760
        # - GnuTLS manual
 
1761
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
1762
        
 
1763
        @gnutls.library.types.gnutls_log_func
 
1764
        def debug_gnutls(level, string):
 
1765
            logger.debug(u"GnuTLS: %s", string[:-1])
 
1766
        
 
1767
        (gnutls.library.functions
 
1768
         .gnutls_global_set_log_function(debug_gnutls))
746
1769
    
747
1770
    global main_loop
748
 
    global bus
749
 
    global server
750
1771
    # From the Avahi example code
751
1772
    DBusGMainLoop(set_as_default=True )
752
1773
    main_loop = gobject.MainLoop()
753
1774
    bus = dbus.SystemBus()
754
 
    server = dbus.Interface(
755
 
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
756
 
            avahi.DBUS_INTERFACE_SERVER )
757
1775
    # End of Avahi example code
758
 
    
759
 
    clients = Set()
760
 
    def remove_from_clients(client):
761
 
        clients.remove(client)
762
 
        if not clients:
763
 
            logger.critical(u"No clients left, exiting")
764
 
            sys.exit()
765
 
    
766
 
    clients.update(Set(Client(name = section,
767
 
                              stop_hook = remove_from_clients,
768
 
                              config
769
 
                              = dict(client_config.items(section)))
770
 
                       for section in client_config.sections()))
771
 
    if not clients:
772
 
        logger.critical(u"No clients defined")
773
 
        sys.exit(1)
774
 
    
775
 
    if not debug:
 
1776
    if use_dbus:
 
1777
        try:
 
1778
            bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
 
1779
                                            bus, do_not_queue=True)
 
1780
        except dbus.exceptions.NameExistsException, e:
 
1781
            logger.error(unicode(e) + u", disabling D-Bus")
 
1782
            use_dbus = False
 
1783
            server_settings[u"use_dbus"] = False
 
1784
            tcp_server.use_dbus = False
 
1785
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
1786
    service = AvahiService(name = server_settings[u"servicename"],
 
1787
                           servicetype = u"_mandos._tcp",
 
1788
                           protocol = protocol, bus = bus)
 
1789
    if server_settings["interface"]:
 
1790
        service.interface = (if_nametoindex
 
1791
                             (str(server_settings[u"interface"])))
 
1792
 
 
1793
    global multiprocessing_manager
 
1794
    multiprocessing_manager = multiprocessing.Manager()
 
1795
    
 
1796
    client_class = Client
 
1797
    if use_dbus:
 
1798
        client_class = functools.partial(ClientDBus, bus = bus)
 
1799
    def client_config_items(config, section):
 
1800
        special_settings = {
 
1801
            "approved_by_default":
 
1802
                lambda: config.getboolean(section,
 
1803
                                          "approved_by_default"),
 
1804
            }
 
1805
        for name, value in config.items(section):
 
1806
            try:
 
1807
                yield (name, special_settings[name]())
 
1808
            except KeyError:
 
1809
                yield (name, value)
 
1810
    
 
1811
    tcp_server.clients.update(set(
 
1812
            client_class(name = section,
 
1813
                         config= dict(client_config_items(
 
1814
                        client_config, section)))
 
1815
            for section in client_config.sections()))
 
1816
    if not tcp_server.clients:
 
1817
        logger.warning(u"No clients defined")
 
1818
    
 
1819
    if debug:
 
1820
        # Redirect stdin so all checkers get /dev/null
 
1821
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
1822
        os.dup2(null, sys.stdin.fileno())
 
1823
        if null > 2:
 
1824
            os.close(null)
 
1825
    else:
 
1826
        # No console logging
776
1827
        logger.removeHandler(console)
 
1828
        # Close all input and output, do double fork, etc.
777
1829
        daemon()
778
1830
    
779
 
    pidfilename = "/var/run/mandos/mandos.pid"
780
 
    pid = os.getpid()
781
1831
    try:
782
 
        pidfile = open(pidfilename, "w")
783
 
        pidfile.write(str(pid) + "\n")
784
 
        pidfile.close()
 
1832
        with pidfile:
 
1833
            pid = os.getpid()
 
1834
            pidfile.write(str(pid) + "\n")
785
1835
        del pidfile
786
 
    except IOError, err:
787
 
        logger.error(u"Could not write %s file with PID %d",
788
 
                     pidfilename, os.getpid())
 
1836
    except IOError:
 
1837
        logger.error(u"Could not write to file %r with PID %d",
 
1838
                     pidfilename, pid)
 
1839
    except NameError:
 
1840
        # "pidfile" was never created
 
1841
        pass
 
1842
    del pidfilename
 
1843
    
 
1844
    if not debug:
 
1845
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
1846
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
1847
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
1848
    
 
1849
    if use_dbus:
 
1850
        class MandosDBusService(dbus.service.Object):
 
1851
            """A D-Bus proxy object"""
 
1852
            def __init__(self):
 
1853
                dbus.service.Object.__init__(self, bus, u"/")
 
1854
            _interface = u"se.bsnet.fukt.Mandos"
 
1855
            
 
1856
            @dbus.service.signal(_interface, signature=u"o")
 
1857
            def ClientAdded(self, objpath):
 
1858
                "D-Bus signal"
 
1859
                pass
 
1860
            
 
1861
            @dbus.service.signal(_interface, signature=u"ss")
 
1862
            def ClientNotFound(self, fingerprint, address):
 
1863
                "D-Bus signal"
 
1864
                pass
 
1865
            
 
1866
            @dbus.service.signal(_interface, signature=u"os")
 
1867
            def ClientRemoved(self, objpath, name):
 
1868
                "D-Bus signal"
 
1869
                pass
 
1870
            
 
1871
            @dbus.service.method(_interface, out_signature=u"ao")
 
1872
            def GetAllClients(self):
 
1873
                "D-Bus method"
 
1874
                return dbus.Array(c.dbus_object_path
 
1875
                                  for c in tcp_server.clients)
 
1876
            
 
1877
            @dbus.service.method(_interface,
 
1878
                                 out_signature=u"a{oa{sv}}")
 
1879
            def GetAllClientsWithProperties(self):
 
1880
                "D-Bus method"
 
1881
                return dbus.Dictionary(
 
1882
                    ((c.dbus_object_path, c.GetAll(u""))
 
1883
                     for c in tcp_server.clients),
 
1884
                    signature=u"oa{sv}")
 
1885
            
 
1886
            @dbus.service.method(_interface, in_signature=u"o")
 
1887
            def RemoveClient(self, object_path):
 
1888
                "D-Bus method"
 
1889
                for c in tcp_server.clients:
 
1890
                    if c.dbus_object_path == object_path:
 
1891
                        tcp_server.clients.remove(c)
 
1892
                        c.remove_from_connection()
 
1893
                        # Don't signal anything except ClientRemoved
 
1894
                        c.disable(quiet=True)
 
1895
                        # Emit D-Bus signal
 
1896
                        self.ClientRemoved(object_path, c.name)
 
1897
                        return
 
1898
                raise KeyError(object_path)
 
1899
            
 
1900
            del _interface
 
1901
        
 
1902
        mandos_dbus_service = MandosDBusService()
789
1903
    
790
1904
    def cleanup():
791
1905
        "Cleanup function; run on exit"
792
 
        global group
793
 
        # From the Avahi example code
794
 
        if not group is None:
795
 
            group.Free()
796
 
            group = None
797
 
        # End of Avahi example code
 
1906
        service.cleanup()
798
1907
        
799
 
        while clients:
800
 
            client = clients.pop()
801
 
            client.stop_hook = None
802
 
            client.stop()
 
1908
        while tcp_server.clients:
 
1909
            client = tcp_server.clients.pop()
 
1910
            if use_dbus:
 
1911
                client.remove_from_connection()
 
1912
            client.disable_hook = None
 
1913
            # Don't signal anything except ClientRemoved
 
1914
            client.disable(quiet=True)
 
1915
            if use_dbus:
 
1916
                # Emit D-Bus signal
 
1917
                mandos_dbus_service.ClientRemoved(client.dbus_object_path,
 
1918
                                                  client.name)
803
1919
    
804
1920
    atexit.register(cleanup)
805
1921
    
806
 
    if not debug:
807
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
808
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
809
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
810
 
    
811
 
    for client in clients:
812
 
        client.start()
813
 
    
814
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
815
 
                                 server_settings["port"]),
816
 
                                tcp_handler,
817
 
                                settings=server_settings,
818
 
                                clients=clients)
 
1922
    for client in tcp_server.clients:
 
1923
        if use_dbus:
 
1924
            # Emit D-Bus signal
 
1925
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
 
1926
        client.enable()
 
1927
    
 
1928
    tcp_server.enable()
 
1929
    tcp_server.server_activate()
 
1930
    
819
1931
    # Find out what port we got
820
1932
    service.port = tcp_server.socket.getsockname()[1]
821
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
822
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
1933
    if use_ipv6:
 
1934
        logger.info(u"Now listening on address %r, port %d,"
 
1935
                    " flowinfo %d, scope_id %d"
 
1936
                    % tcp_server.socket.getsockname())
 
1937
    else:                       # IPv4
 
1938
        logger.info(u"Now listening on address %r, port %d"
 
1939
                    % tcp_server.socket.getsockname())
823
1940
    
824
1941
    #service.interface = tcp_server.socket.getsockname()[3]
825
1942
    
826
1943
    try:
827
1944
        # From the Avahi example code
828
 
        server.connect_to_signal("StateChanged", server_state_changed)
829
1945
        try:
830
 
            server_state_changed(server.GetState())
 
1946
            service.activate()
831
1947
        except dbus.exceptions.DBusException, error:
832
1948
            logger.critical(u"DBusException: %s", error)
 
1949
            cleanup()
833
1950
            sys.exit(1)
834
1951
        # End of Avahi example code
835
1952
        
836
1953
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
837
1954
                             lambda *args, **kwargs:
838
 
                             tcp_server.handle_request\
839
 
                             (*args[2:], **kwargs) or True)
 
1955
                             (tcp_server.handle_request
 
1956
                              (*args[2:], **kwargs) or True))
840
1957
        
841
1958
        logger.debug(u"Starting main loop")
842
 
        main_loop_started = True
843
1959
        main_loop.run()
844
1960
    except AvahiError, error:
845
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
1961
        logger.critical(u"AvahiError: %s", error)
 
1962
        cleanup()
846
1963
        sys.exit(1)
847
1964
    except KeyboardInterrupt:
848
1965
        if debug:
849
 
            print
 
1966
            print >> sys.stderr
 
1967
        logger.debug(u"Server received KeyboardInterrupt")
 
1968
    logger.debug(u"Server exiting")
 
1969
    # Must run before the D-Bus bus name gets deregistered
 
1970
    cleanup()
850
1971
 
851
1972
if __name__ == '__main__':
852
1973
    main()