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  • Committer: teddy at recompile
  • Date: 2011-12-27 14:15:40 UTC
  • Revision ID: teddy@recompile.se-20111227141540-ajrabf33q59jfa7t
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6
6
# 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 © 2008-2011 Teddy Hogeborn
 
15
# Copyright © 2008-2011 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
27
28
# along with this program.  If not, see
28
29
# <http://www.gnu.org/licenses/>.
29
30
30
 
# Contact the authors at <mandos@fukt.bsnet.se>.
 
31
# Contact the authors at <mandos@recompile.se>.
31
32
32
33
 
33
 
from __future__ import division
 
34
from __future__ import (division, absolute_import, print_function,
 
35
                        unicode_literals)
34
36
 
35
 
import SocketServer
 
37
import SocketServer as socketserver
36
38
import socket
37
 
import select
38
 
from optparse import OptionParser
 
39
import argparse
39
40
import datetime
40
41
import errno
41
42
import gnutls.crypto
44
45
import gnutls.library.functions
45
46
import gnutls.library.constants
46
47
import gnutls.library.types
47
 
import ConfigParser
 
48
import ConfigParser as configparser
48
49
import sys
49
50
import re
50
51
import os
51
52
import signal
52
 
from sets import Set
53
53
import subprocess
54
54
import atexit
55
55
import stat
56
56
import logging
57
57
import logging.handlers
58
58
import pwd
 
59
import contextlib
 
60
import struct
 
61
import fcntl
 
62
import functools
 
63
import cPickle as pickle
 
64
import multiprocessing
 
65
import types
 
66
import binascii
 
67
import tempfile
59
68
 
60
69
import dbus
 
70
import dbus.service
61
71
import gobject
62
72
import avahi
63
73
from dbus.mainloop.glib import DBusGMainLoop
64
74
import ctypes
65
 
 
66
 
version = "1.0"
67
 
 
68
 
logger = logging.Logger('mandos')
69
 
syslogger = logging.handlers.SysLogHandler\
70
 
            (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
 
             address = "/dev/log")
72
 
syslogger.setFormatter(logging.Formatter\
73
 
                        ('Mandos: %(levelname)s: %(message)s'))
74
 
logger.addHandler(syslogger)
75
 
 
76
 
console = logging.StreamHandler()
77
 
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
 
                                       ' %(message)s'))
79
 
logger.addHandler(console)
 
75
import ctypes.util
 
76
import xml.dom.minidom
 
77
import inspect
 
78
import GnuPGInterface
 
79
 
 
80
try:
 
81
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
 
82
except AttributeError:
 
83
    try:
 
84
        from IN import SO_BINDTODEVICE
 
85
    except ImportError:
 
86
        SO_BINDTODEVICE = None
 
87
 
 
88
version = "1.4.1"
 
89
stored_state_file = "clients.pickle"
 
90
 
 
91
logger = logging.getLogger()
 
92
syslogger = (logging.handlers.SysLogHandler
 
93
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
 
94
              address = str("/dev/log")))
 
95
 
 
96
try:
 
97
    if_nametoindex = (ctypes.cdll.LoadLibrary
 
98
                      (ctypes.util.find_library("c"))
 
99
                      .if_nametoindex)
 
100
except (OSError, AttributeError):
 
101
    def if_nametoindex(interface):
 
102
        "Get an interface index the hard way, i.e. using fcntl()"
 
103
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
 
104
        with contextlib.closing(socket.socket()) as s:
 
105
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
106
                                struct.pack(str("16s16x"),
 
107
                                            interface))
 
108
        interface_index = struct.unpack(str("I"),
 
109
                                        ifreq[16:20])[0]
 
110
        return interface_index
 
111
 
 
112
 
 
113
def initlogger(debug, level=logging.WARNING):
 
114
    """init logger and add loglevel"""
 
115
    
 
116
    syslogger.setFormatter(logging.Formatter
 
117
                           ('Mandos [%(process)d]: %(levelname)s:'
 
118
                            ' %(message)s'))
 
119
    logger.addHandler(syslogger)
 
120
    
 
121
    if debug:
 
122
        console = logging.StreamHandler()
 
123
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
 
124
                                               ' [%(process)d]:'
 
125
                                               ' %(levelname)s:'
 
126
                                               ' %(message)s'))
 
127
        logger.addHandler(console)
 
128
    logger.setLevel(level)
 
129
 
 
130
 
 
131
class PGPError(Exception):
 
132
    """Exception if encryption/decryption fails"""
 
133
    pass
 
134
 
 
135
 
 
136
class PGPEngine(object):
 
137
    """A simple class for OpenPGP symmetric encryption & decryption"""
 
138
    def __init__(self):
 
139
        self.gnupg = GnuPGInterface.GnuPG()
 
140
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
 
141
        self.gnupg = GnuPGInterface.GnuPG()
 
142
        self.gnupg.options.meta_interactive = False
 
143
        self.gnupg.options.homedir = self.tempdir
 
144
        self.gnupg.options.extra_args.extend(['--force-mdc',
 
145
                                              '--quiet'])
 
146
    
 
147
    def __enter__(self):
 
148
        return self
 
149
    
 
150
    def __exit__ (self, exc_type, exc_value, traceback):
 
151
        self._cleanup()
 
152
        return False
 
153
    
 
154
    def __del__(self):
 
155
        self._cleanup()
 
156
    
 
157
    def _cleanup(self):
 
158
        if self.tempdir is not None:
 
159
            # Delete contents of tempdir
 
160
            for root, dirs, files in os.walk(self.tempdir,
 
161
                                             topdown = False):
 
162
                for filename in files:
 
163
                    os.remove(os.path.join(root, filename))
 
164
                for dirname in dirs:
 
165
                    os.rmdir(os.path.join(root, dirname))
 
166
            # Remove tempdir
 
167
            os.rmdir(self.tempdir)
 
168
            self.tempdir = None
 
169
    
 
170
    def password_encode(self, password):
 
171
        # Passphrase can not be empty and can not contain newlines or
 
172
        # NUL bytes.  So we prefix it and hex encode it.
 
173
        return b"mandos" + binascii.hexlify(password)
 
174
    
 
175
    def encrypt(self, data, password):
 
176
        self.gnupg.passphrase = self.password_encode(password)
 
177
        with open(os.devnull) as devnull:
 
178
            try:
 
179
                proc = self.gnupg.run(['--symmetric'],
 
180
                                      create_fhs=['stdin', 'stdout'],
 
181
                                      attach_fhs={'stderr': devnull})
 
182
                with contextlib.closing(proc.handles['stdin']) as f:
 
183
                    f.write(data)
 
184
                with contextlib.closing(proc.handles['stdout']) as f:
 
185
                    ciphertext = f.read()
 
186
                proc.wait()
 
187
            except IOError as e:
 
188
                raise PGPError(e)
 
189
        self.gnupg.passphrase = None
 
190
        return ciphertext
 
191
    
 
192
    def decrypt(self, data, password):
 
193
        self.gnupg.passphrase = self.password_encode(password)
 
194
        with open(os.devnull) as devnull:
 
195
            try:
 
196
                proc = self.gnupg.run(['--decrypt'],
 
197
                                      create_fhs=['stdin', 'stdout'],
 
198
                                      attach_fhs={'stderr': devnull})
 
199
                with contextlib.closing(proc.handles['stdin'] ) as f:
 
200
                    f.write(data)
 
201
                with contextlib.closing(proc.handles['stdout']) as f:
 
202
                    decrypted_plaintext = f.read()
 
203
                proc.wait()
 
204
            except IOError as e:
 
205
                raise PGPError(e)
 
206
        self.gnupg.passphrase = None
 
207
        return decrypted_plaintext
 
208
 
 
209
 
80
210
 
81
211
class AvahiError(Exception):
82
 
    def __init__(self, value):
 
212
    def __init__(self, value, *args, **kwargs):
83
213
        self.value = value
84
 
    def __str__(self):
85
 
        return repr(self.value)
 
214
        super(AvahiError, self).__init__(value, *args, **kwargs)
 
215
    def __unicode__(self):
 
216
        return unicode(repr(self.value))
86
217
 
87
218
class AvahiServiceError(AvahiError):
88
219
    pass
93
224
 
94
225
class AvahiService(object):
95
226
    """An Avahi (Zeroconf) service.
 
227
    
96
228
    Attributes:
97
229
    interface: integer; avahi.IF_UNSPEC or an interface index.
98
230
               Used to optionally bind to the specified interface.
106
238
    max_renames: integer; maximum number of renames
107
239
    rename_count: integer; counter so we only rename after collisions
108
240
                  a sensible number of times
 
241
    group: D-Bus Entry Group
 
242
    server: D-Bus Server
 
243
    bus: dbus.SystemBus()
109
244
    """
110
245
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
111
 
                 type = None, port = None, TXT = None, domain = "",
112
 
                 host = "", max_renames = 32768):
 
246
                 servicetype = None, port = None, TXT = None,
 
247
                 domain = "", host = "", max_renames = 32768,
 
248
                 protocol = avahi.PROTO_UNSPEC, bus = None):
113
249
        self.interface = interface
114
250
        self.name = name
115
 
        self.type = type
 
251
        self.type = servicetype
116
252
        self.port = port
117
 
        if TXT is None:
118
 
            self.TXT = []
119
 
        else:
120
 
            self.TXT = TXT
 
253
        self.TXT = TXT if TXT is not None else []
121
254
        self.domain = domain
122
255
        self.host = host
123
256
        self.rename_count = 0
124
257
        self.max_renames = max_renames
 
258
        self.protocol = protocol
 
259
        self.group = None       # our entry group
 
260
        self.server = None
 
261
        self.bus = bus
 
262
        self.entry_group_state_changed_match = None
125
263
    def rename(self):
126
264
        """Derived from the Avahi example code"""
127
265
        if self.rename_count >= self.max_renames:
128
 
            logger.critical(u"No suitable Zeroconf service name found"
129
 
                            u" after %i retries, exiting.",
130
 
                            rename_count)
 
266
            logger.critical("No suitable Zeroconf service name found"
 
267
                            " after %i retries, exiting.",
 
268
                            self.rename_count)
131
269
            raise AvahiServiceError("Too many renames")
132
 
        self.name = server.GetAlternativeServiceName(self.name)
133
 
        logger.info(u"Changing Zeroconf service name to %r ...",
134
 
                    str(self.name))
135
 
        syslogger.setFormatter(logging.Formatter\
136
 
                               ('Mandos (%s): %%(levelname)s:'
137
 
                               ' %%(message)s' % self.name))
 
270
        self.name = unicode(self.server
 
271
                            .GetAlternativeServiceName(self.name))
 
272
        logger.info("Changing Zeroconf service name to %r ...",
 
273
                    self.name)
138
274
        self.remove()
139
 
        self.add()
 
275
        try:
 
276
            self.add()
 
277
        except dbus.exceptions.DBusException as error:
 
278
            logger.critical("DBusException: %s", error)
 
279
            self.cleanup()
 
280
            os._exit(1)
140
281
        self.rename_count += 1
141
282
    def remove(self):
142
283
        """Derived from the Avahi example code"""
143
 
        if group is not None:
144
 
            group.Reset()
 
284
        if self.entry_group_state_changed_match is not None:
 
285
            self.entry_group_state_changed_match.remove()
 
286
            self.entry_group_state_changed_match = None
 
287
        if self.group is not None:
 
288
            self.group.Reset()
145
289
    def add(self):
146
290
        """Derived from the Avahi example code"""
147
 
        global group
148
 
        if group is None:
149
 
            group = dbus.Interface\
150
 
                    (bus.get_object(avahi.DBUS_NAME,
151
 
                                    server.EntryGroupNew()),
152
 
                     avahi.DBUS_INTERFACE_ENTRY_GROUP)
153
 
            group.connect_to_signal('StateChanged',
154
 
                                    entry_group_state_changed)
155
 
        logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
156
 
                     service.name, service.type)
157
 
        group.AddService(
158
 
                self.interface,         # interface
159
 
                avahi.PROTO_INET6,      # protocol
160
 
                dbus.UInt32(0),         # flags
161
 
                self.name, self.type,
162
 
                self.domain, self.host,
163
 
                dbus.UInt16(self.port),
164
 
                avahi.string_array_to_txt_array(self.TXT))
165
 
        group.Commit()
166
 
 
167
 
# From the Avahi example code:
168
 
group = None                            # our entry group
169
 
# End of Avahi example code
170
 
 
171
 
 
 
291
        self.remove()
 
292
        if self.group is None:
 
293
            self.group = dbus.Interface(
 
294
                self.bus.get_object(avahi.DBUS_NAME,
 
295
                                    self.server.EntryGroupNew()),
 
296
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
297
        self.entry_group_state_changed_match = (
 
298
            self.group.connect_to_signal(
 
299
                'StateChanged', self.entry_group_state_changed))
 
300
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
 
301
                     self.name, self.type)
 
302
        self.group.AddService(
 
303
            self.interface,
 
304
            self.protocol,
 
305
            dbus.UInt32(0),     # flags
 
306
            self.name, self.type,
 
307
            self.domain, self.host,
 
308
            dbus.UInt16(self.port),
 
309
            avahi.string_array_to_txt_array(self.TXT))
 
310
        self.group.Commit()
 
311
    def entry_group_state_changed(self, state, error):
 
312
        """Derived from the Avahi example code"""
 
313
        logger.debug("Avahi entry group state change: %i", state)
 
314
        
 
315
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
316
            logger.debug("Zeroconf service established.")
 
317
        elif state == avahi.ENTRY_GROUP_COLLISION:
 
318
            logger.info("Zeroconf service name collision.")
 
319
            self.rename()
 
320
        elif state == avahi.ENTRY_GROUP_FAILURE:
 
321
            logger.critical("Avahi: Error in group state changed %s",
 
322
                            unicode(error))
 
323
            raise AvahiGroupError("State changed: %s"
 
324
                                  % unicode(error))
 
325
    def cleanup(self):
 
326
        """Derived from the Avahi example code"""
 
327
        if self.group is not None:
 
328
            try:
 
329
                self.group.Free()
 
330
            except (dbus.exceptions.UnknownMethodException,
 
331
                    dbus.exceptions.DBusException):
 
332
                pass
 
333
            self.group = None
 
334
        self.remove()
 
335
    def server_state_changed(self, state, error=None):
 
336
        """Derived from the Avahi example code"""
 
337
        logger.debug("Avahi server state change: %i", state)
 
338
        bad_states = { avahi.SERVER_INVALID:
 
339
                           "Zeroconf server invalid",
 
340
                       avahi.SERVER_REGISTERING: None,
 
341
                       avahi.SERVER_COLLISION:
 
342
                           "Zeroconf server name collision",
 
343
                       avahi.SERVER_FAILURE:
 
344
                           "Zeroconf server failure" }
 
345
        if state in bad_states:
 
346
            if bad_states[state] is not None:
 
347
                if error is None:
 
348
                    logger.error(bad_states[state])
 
349
                else:
 
350
                    logger.error(bad_states[state] + ": %r", error)
 
351
            self.cleanup()
 
352
        elif state == avahi.SERVER_RUNNING:
 
353
            self.add()
 
354
        else:
 
355
            if error is None:
 
356
                logger.debug("Unknown state: %r", state)
 
357
            else:
 
358
                logger.debug("Unknown state: %r: %r", state, error)
 
359
    def activate(self):
 
360
        """Derived from the Avahi example code"""
 
361
        if self.server is None:
 
362
            self.server = dbus.Interface(
 
363
                self.bus.get_object(avahi.DBUS_NAME,
 
364
                                    avahi.DBUS_PATH_SERVER,
 
365
                                    follow_name_owner_changes=True),
 
366
                avahi.DBUS_INTERFACE_SERVER)
 
367
        self.server.connect_to_signal("StateChanged",
 
368
                                 self.server_state_changed)
 
369
        self.server_state_changed(self.server.GetState())
 
370
 
 
371
class AvahiServiceToSyslog(AvahiService):
 
372
    def rename(self):
 
373
        """Add the new name to the syslog messages"""
 
374
        ret = AvahiService.rename(self)
 
375
        syslogger.setFormatter(logging.Formatter
 
376
                               ('Mandos (%s) [%%(process)d]:'
 
377
                                ' %%(levelname)s: %%(message)s'
 
378
                                % self.name))
 
379
        return ret
 
380
 
 
381
def timedelta_to_milliseconds(td):
 
382
    "Convert a datetime.timedelta() to milliseconds"
 
383
    return ((td.days * 24 * 60 * 60 * 1000)
 
384
            + (td.seconds * 1000)
 
385
            + (td.microseconds // 1000))
 
386
        
172
387
class Client(object):
173
388
    """A representation of a client host served by this server.
 
389
    
174
390
    Attributes:
175
 
    name:      string; from the config file, used in log messages
 
391
    approved:   bool(); 'None' if not yet approved/disapproved
 
392
    approval_delay: datetime.timedelta(); Time to wait for approval
 
393
    approval_duration: datetime.timedelta(); Duration of one approval
 
394
    checker:    subprocess.Popen(); a running checker process used
 
395
                                    to see if the client lives.
 
396
                                    'None' if no process is running.
 
397
    checker_callback_tag: a gobject event source tag, or None
 
398
    checker_command: string; External command which is run to check
 
399
                     if client lives.  %() expansions are done at
 
400
                     runtime with vars(self) as dict, so that for
 
401
                     instance %(name)s can be used in the command.
 
402
    checker_initiator_tag: a gobject event source tag, or None
 
403
    created:    datetime.datetime(); (UTC) object creation
 
404
    client_structure: Object describing what attributes a client has
 
405
                      and is used for storing the client at exit
 
406
    current_checker_command: string; current running checker_command
 
407
    disable_initiator_tag: a gobject event source tag, or None
 
408
    enabled:    bool()
176
409
    fingerprint: string (40 or 32 hexadecimal digits); used to
177
410
                 uniquely identify the client
178
 
    secret:    bytestring; sent verbatim (over TLS) to client
179
 
    host:      string; available for use by the checker command
180
 
    created:   datetime.datetime(); object creation, not client host
181
 
    last_checked_ok: datetime.datetime() or None if not yet checked OK
182
 
    timeout:   datetime.timedelta(); How long from last_checked_ok
183
 
                                     until this client is invalid
184
 
    interval:  datetime.timedelta(); How often to start a new checker
185
 
    stop_hook: If set, called by stop() as stop_hook(self)
186
 
    checker:   subprocess.Popen(); a running checker process used
187
 
                                   to see if the client lives.
188
 
                                   'None' if no process is running.
189
 
    checker_initiator_tag: a gobject event source tag, or None
190
 
    stop_initiator_tag:    - '' -
191
 
    checker_callback_tag:  - '' -
192
 
    checker_command: string; External command which is run to check if
193
 
                     client lives.  %() expansions are done at
194
 
                     runtime with vars(self) as dict, so that for
195
 
                     instance %(name)s can be used in the command.
196
 
    Private attibutes:
197
 
    _timeout: Real variable for 'timeout'
198
 
    _interval: Real variable for 'interval'
199
 
    _timeout_milliseconds: Used when calling gobject.timeout_add()
200
 
    _interval_milliseconds: - '' -
 
411
    host:       string; available for use by the checker command
 
412
    interval:   datetime.timedelta(); How often to start a new checker
 
413
    last_approval_request: datetime.datetime(); (UTC) or None
 
414
    last_checked_ok: datetime.datetime(); (UTC) or None
 
415
    last_checker_status: integer between 0 and 255 reflecting exit
 
416
                         status of last checker. -1 reflects crashed
 
417
                         checker, or None.
 
418
    last_enabled: datetime.datetime(); (UTC) or None
 
419
    name:       string; from the config file, used in log messages and
 
420
                        D-Bus identifiers
 
421
    secret:     bytestring; sent verbatim (over TLS) to client
 
422
    timeout:    datetime.timedelta(); How long from last_checked_ok
 
423
                                      until this client is disabled
 
424
    extended_timeout:   extra long timeout when password has been sent
 
425
    runtime_expansions: Allowed attributes for runtime expansion.
 
426
    expires:    datetime.datetime(); time (UTC) when a client will be
 
427
                disabled, or None
201
428
    """
202
 
    def _set_timeout(self, timeout):
203
 
        "Setter function for 'timeout' attribute"
204
 
        self._timeout = timeout
205
 
        self._timeout_milliseconds = ((self.timeout.days
206
 
                                       * 24 * 60 * 60 * 1000)
207
 
                                      + (self.timeout.seconds * 1000)
208
 
                                      + (self.timeout.microseconds
209
 
                                         // 1000))
210
 
    timeout = property(lambda self: self._timeout,
211
 
                       _set_timeout)
212
 
    del _set_timeout
213
 
    def _set_interval(self, interval):
214
 
        "Setter function for 'interval' attribute"
215
 
        self._interval = interval
216
 
        self._interval_milliseconds = ((self.interval.days
217
 
                                        * 24 * 60 * 60 * 1000)
218
 
                                       + (self.interval.seconds
219
 
                                          * 1000)
220
 
                                       + (self.interval.microseconds
221
 
                                          // 1000))
222
 
    interval = property(lambda self: self._interval,
223
 
                        _set_interval)
224
 
    del _set_interval
225
 
    def __init__(self, name = None, stop_hook=None, config={}):
 
429
    
 
430
    runtime_expansions = ("approval_delay", "approval_duration",
 
431
                          "created", "enabled", "fingerprint",
 
432
                          "host", "interval", "last_checked_ok",
 
433
                          "last_enabled", "name", "timeout")
 
434
    client_defaults = { "timeout": "5m",
 
435
                        "extended_timeout": "15m",
 
436
                        "interval": "2m",
 
437
                        "checker": "fping -q -- %%(host)s",
 
438
                        "host": "",
 
439
                        "approval_delay": "0s",
 
440
                        "approval_duration": "1s",
 
441
                        "approved_by_default": "True",
 
442
                        "enabled": "True",
 
443
                        }
 
444
    
 
445
    def timeout_milliseconds(self):
 
446
        "Return the 'timeout' attribute in milliseconds"
 
447
        return timedelta_to_milliseconds(self.timeout)
 
448
    
 
449
    def extended_timeout_milliseconds(self):
 
450
        "Return the 'extended_timeout' attribute in milliseconds"
 
451
        return timedelta_to_milliseconds(self.extended_timeout)
 
452
    
 
453
    def interval_milliseconds(self):
 
454
        "Return the 'interval' attribute in milliseconds"
 
455
        return timedelta_to_milliseconds(self.interval)
 
456
    
 
457
    def approval_delay_milliseconds(self):
 
458
        return timedelta_to_milliseconds(self.approval_delay)
 
459
 
 
460
    @staticmethod
 
461
    def config_parser(config):
 
462
        """ Construct a new dict of client settings of this form:
 
463
        { client_name: {setting_name: value, ...}, ...}
 
464
        with exceptions for any special settings as defined above"""
 
465
        settings = {}
 
466
        for client_name in config.sections():
 
467
            section = dict(config.items(client_name))
 
468
            client = settings[client_name] = {}
 
469
            
 
470
            client["host"] = section["host"]
 
471
            # Reformat values from string types to Python types
 
472
            client["approved_by_default"] = config.getboolean(
 
473
                client_name, "approved_by_default")
 
474
            client["enabled"] = config.getboolean(client_name, "enabled")
 
475
            
 
476
            client["fingerprint"] = (section["fingerprint"].upper()
 
477
                                     .replace(" ", ""))
 
478
            if "secret" in section:
 
479
                client["secret"] = section["secret"].decode("base64")
 
480
            elif "secfile" in section:
 
481
                with open(os.path.expanduser(os.path.expandvars
 
482
                                             (section["secfile"])),
 
483
                          "rb") as secfile:
 
484
                    client["secret"] = secfile.read()
 
485
            else:
 
486
                raise TypeError("No secret or secfile for section %s"
 
487
                                % section)
 
488
            client["timeout"] = string_to_delta(section["timeout"])
 
489
            client["extended_timeout"] = string_to_delta(
 
490
                section["extended_timeout"])
 
491
            client["interval"] = string_to_delta(section["interval"])
 
492
            client["approval_delay"] = string_to_delta(
 
493
                section["approval_delay"])
 
494
            client["approval_duration"] = string_to_delta(
 
495
                section["approval_duration"])
 
496
            client["checker_command"] = section["checker"]
 
497
            client["last_approval_request"] = None
 
498
            client["last_checked_ok"] = None
 
499
            client["last_checker_status"] = None
 
500
            if client["enabled"]:
 
501
                client["last_enabled"] = datetime.datetime.utcnow()
 
502
                client["expires"] = (datetime.datetime.utcnow()
 
503
                                     + client["timeout"])
 
504
            else:
 
505
                client["last_enabled"] = None
 
506
                client["expires"] = None
 
507
 
 
508
        return settings
 
509
        
 
510
        
 
511
    def __init__(self, settings, name = None):
226
512
        """Note: the 'checker' key in 'config' sets the
227
513
        'checker_command' attribute and *not* the 'checker'
228
514
        attribute."""
229
515
        self.name = name
230
 
        logger.debug(u"Creating client %r", self.name)
 
516
        # adding all client settings
 
517
        for setting, value in settings.iteritems():
 
518
            setattr(self, setting, value)
 
519
        
 
520
        logger.debug("Creating client %r", self.name)
231
521
        # Uppercase and remove spaces from fingerprint for later
232
522
        # comparison purposes with return value from the fingerprint()
233
523
        # function
234
 
        self.fingerprint = config["fingerprint"].upper()\
235
 
                           .replace(u" ", u"")
236
 
        logger.debug(u"  Fingerprint: %s", self.fingerprint)
237
 
        if "secret" in config:
238
 
            self.secret = config["secret"].decode(u"base64")
239
 
        elif "secfile" in config:
240
 
            sf = open(config["secfile"])
241
 
            self.secret = sf.read()
242
 
            sf.close()
243
 
        else:
244
 
            raise TypeError(u"No secret or secfile for client %s"
245
 
                            % self.name)
246
 
        self.host = config.get("host", "")
247
 
        self.created = datetime.datetime.now()
248
 
        self.last_checked_ok = None
249
 
        self.timeout = string_to_delta(config["timeout"])
250
 
        self.interval = string_to_delta(config["interval"])
251
 
        self.stop_hook = stop_hook
 
524
        logger.debug("  Fingerprint: %s", self.fingerprint)
 
525
        self.created = settings.get("created", datetime.datetime.utcnow())
 
526
 
 
527
        # attributes specific for this server instance
252
528
        self.checker = None
253
529
        self.checker_initiator_tag = None
254
 
        self.stop_initiator_tag = None
 
530
        self.disable_initiator_tag = None
255
531
        self.checker_callback_tag = None
256
 
        self.check_command = config["checker"]
257
 
    def start(self):
 
532
        self.current_checker_command = None
 
533
        self.approved = None
 
534
        self.approvals_pending = 0
 
535
        self.changedstate = (multiprocessing_manager
 
536
                             .Condition(multiprocessing_manager
 
537
                                        .Lock()))
 
538
        self.client_structure = [attr for attr in
 
539
                                 self.__dict__.iterkeys()
 
540
                                 if not attr.startswith("_")]
 
541
        self.client_structure.append("client_structure")
 
542
        
 
543
        for name, t in inspect.getmembers(type(self),
 
544
                                          lambda obj:
 
545
                                              isinstance(obj,
 
546
                                                         property)):
 
547
            if not name.startswith("_"):
 
548
                self.client_structure.append(name)
 
549
    
 
550
    # Send notice to process children that client state has changed
 
551
    def send_changedstate(self):
 
552
        with self.changedstate:
 
553
            self.changedstate.notify_all()
 
554
    
 
555
    def enable(self):
258
556
        """Start this client's checker and timeout hooks"""
 
557
        if getattr(self, "enabled", False):
 
558
            # Already enabled
 
559
            return
 
560
        self.send_changedstate()
 
561
        self.expires = datetime.datetime.utcnow() + self.timeout
 
562
        self.enabled = True
 
563
        self.last_enabled = datetime.datetime.utcnow()
 
564
        self.init_checker()
 
565
    
 
566
    def disable(self, quiet=True):
 
567
        """Disable this client."""
 
568
        if not getattr(self, "enabled", False):
 
569
            return False
 
570
        if not quiet:
 
571
            self.send_changedstate()
 
572
        if not quiet:
 
573
            logger.info("Disabling client %s", self.name)
 
574
        if getattr(self, "disable_initiator_tag", False):
 
575
            gobject.source_remove(self.disable_initiator_tag)
 
576
            self.disable_initiator_tag = None
 
577
        self.expires = None
 
578
        if getattr(self, "checker_initiator_tag", False):
 
579
            gobject.source_remove(self.checker_initiator_tag)
 
580
            self.checker_initiator_tag = None
 
581
        self.stop_checker()
 
582
        self.enabled = False
 
583
        # Do not run this again if called by a gobject.timeout_add
 
584
        return False
 
585
    
 
586
    def __del__(self):
 
587
        self.disable()
 
588
    
 
589
    def init_checker(self):
259
590
        # Schedule a new checker to be started an 'interval' from now,
260
591
        # and every interval from then on.
261
 
        self.checker_initiator_tag = gobject.timeout_add\
262
 
                                     (self._interval_milliseconds,
263
 
                                      self.start_checker)
 
592
        self.checker_initiator_tag = (gobject.timeout_add
 
593
                                      (self.interval_milliseconds(),
 
594
                                       self.start_checker))
 
595
        # Schedule a disable() when 'timeout' has passed
 
596
        self.disable_initiator_tag = (gobject.timeout_add
 
597
                                   (self.timeout_milliseconds(),
 
598
                                    self.disable))
264
599
        # Also start a new checker *right now*.
265
600
        self.start_checker()
266
 
        # Schedule a stop() when 'timeout' has passed
267
 
        self.stop_initiator_tag = gobject.timeout_add\
268
 
                                  (self._timeout_milliseconds,
269
 
                                   self.stop)
270
 
    def stop(self):
271
 
        """Stop this client.
272
 
        The possibility that a client might be restarted is left open,
273
 
        but not currently used."""
274
 
        # If this client doesn't have a secret, it is already stopped.
275
 
        if hasattr(self, "secret") and self.secret:
276
 
            logger.info(u"Stopping client %s", self.name)
277
 
            self.secret = None
278
 
        else:
279
 
            return False
280
 
        if getattr(self, "stop_initiator_tag", False):
281
 
            gobject.source_remove(self.stop_initiator_tag)
282
 
            self.stop_initiator_tag = None
283
 
        if getattr(self, "checker_initiator_tag", False):
284
 
            gobject.source_remove(self.checker_initiator_tag)
285
 
            self.checker_initiator_tag = None
286
 
        self.stop_checker()
287
 
        if self.stop_hook:
288
 
            self.stop_hook(self)
289
 
        # Do not run this again if called by a gobject.timeout_add
290
 
        return False
291
 
    def __del__(self):
292
 
        self.stop_hook = None
293
 
        self.stop()
294
 
    def checker_callback(self, pid, condition):
 
601
    
 
602
    def checker_callback(self, pid, condition, command):
295
603
        """The checker has completed, so take appropriate actions."""
296
 
        now = datetime.datetime.now()
297
604
        self.checker_callback_tag = None
298
605
        self.checker = None
299
 
        if os.WIFEXITED(condition) \
300
 
               and (os.WEXITSTATUS(condition) == 0):
301
 
            logger.info(u"Checker for %(name)s succeeded",
302
 
                        vars(self))
303
 
            self.last_checked_ok = now
304
 
            gobject.source_remove(self.stop_initiator_tag)
305
 
            self.stop_initiator_tag = gobject.timeout_add\
306
 
                                      (self._timeout_milliseconds,
307
 
                                       self.stop)
308
 
        elif not os.WIFEXITED(condition):
309
 
            logger.warning(u"Checker for %(name)s crashed?",
 
606
        if os.WIFEXITED(condition):
 
607
            self.last_checker_status = os.WEXITSTATUS(condition)
 
608
            if self.last_checker_status == 0:
 
609
                logger.info("Checker for %(name)s succeeded",
 
610
                            vars(self))
 
611
                self.checked_ok()
 
612
            else:
 
613
                logger.info("Checker for %(name)s failed",
 
614
                            vars(self))
 
615
        else:
 
616
            self.last_checker_status = -1
 
617
            logger.warning("Checker for %(name)s crashed?",
310
618
                           vars(self))
311
 
        else:
312
 
            logger.info(u"Checker for %(name)s failed",
313
 
                        vars(self))
 
619
    
 
620
    def checked_ok(self, timeout=None):
 
621
        """Bump up the timeout for this client.
 
622
        
 
623
        This should only be called when the client has been seen,
 
624
        alive and well.
 
625
        """
 
626
        if timeout is None:
 
627
            timeout = self.timeout
 
628
        self.last_checked_ok = datetime.datetime.utcnow()
 
629
        if self.disable_initiator_tag is not None:
 
630
            gobject.source_remove(self.disable_initiator_tag)
 
631
        if getattr(self, "enabled", False):
 
632
            self.disable_initiator_tag = (gobject.timeout_add
 
633
                                          (timedelta_to_milliseconds
 
634
                                           (timeout), self.disable))
 
635
            self.expires = datetime.datetime.utcnow() + timeout
 
636
    
 
637
    def need_approval(self):
 
638
        self.last_approval_request = datetime.datetime.utcnow()
 
639
    
314
640
    def start_checker(self):
315
641
        """Start a new checker subprocess if one is not running.
 
642
        
316
643
        If a checker already exists, leave it running and do
317
644
        nothing."""
318
645
        # The reason for not killing a running checker is that if we
321
648
        # client would inevitably timeout, since no checker would get
322
649
        # a chance to run to completion.  If we instead leave running
323
650
        # checkers alone, the checker would have to take more time
324
 
        # than 'timeout' for the client to be declared invalid, which
325
 
        # is as it should be.
 
651
        # than 'timeout' for the client to be disabled, which is as it
 
652
        # should be.
 
653
        
 
654
        # If a checker exists, make sure it is not a zombie
 
655
        try:
 
656
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
657
        except (AttributeError, OSError) as error:
 
658
            if (isinstance(error, OSError)
 
659
                and error.errno != errno.ECHILD):
 
660
                raise error
 
661
        else:
 
662
            if pid:
 
663
                logger.warning("Checker was a zombie")
 
664
                gobject.source_remove(self.checker_callback_tag)
 
665
                self.checker_callback(pid, status,
 
666
                                      self.current_checker_command)
 
667
        # Start a new checker if needed
326
668
        if self.checker is None:
327
669
            try:
328
 
                # In case check_command has exactly one % operator
329
 
                command = self.check_command % self.host
 
670
                # In case checker_command has exactly one % operator
 
671
                command = self.checker_command % self.host
330
672
            except TypeError:
331
673
                # Escape attributes for the shell
332
 
                escaped_attrs = dict((key, re.escape(str(val)))
333
 
                                     for key, val in
334
 
                                     vars(self).iteritems())
 
674
                escaped_attrs = dict(
 
675
                    (attr,
 
676
                     re.escape(unicode(str(getattr(self, attr, "")),
 
677
                                       errors=
 
678
                                       'replace')))
 
679
                    for attr in
 
680
                    self.runtime_expansions)
 
681
                
335
682
                try:
336
 
                    command = self.check_command % escaped_attrs
337
 
                except TypeError, error:
338
 
                    logger.error(u'Could not format string "%s":'
339
 
                                 u' %s', self.check_command, error)
 
683
                    command = self.checker_command % escaped_attrs
 
684
                except TypeError as error:
 
685
                    logger.error('Could not format string "%s":'
 
686
                                 ' %s', self.checker_command, error)
340
687
                    return True # Try again later
 
688
            self.current_checker_command = command
341
689
            try:
342
 
                logger.info(u"Starting checker %r for %s",
 
690
                logger.info("Starting checker %r for %s",
343
691
                            command, self.name)
344
692
                # We don't need to redirect stdout and stderr, since
345
693
                # in normal mode, that is already done by daemon(),
348
696
                self.checker = subprocess.Popen(command,
349
697
                                                close_fds=True,
350
698
                                                shell=True, cwd="/")
351
 
                self.checker_callback_tag = gobject.child_watch_add\
352
 
                                            (self.checker.pid,
353
 
                                             self.checker_callback)
354
 
            except OSError, error:
355
 
                logger.error(u"Failed to start subprocess: %s",
 
699
                self.checker_callback_tag = (gobject.child_watch_add
 
700
                                             (self.checker.pid,
 
701
                                              self.checker_callback,
 
702
                                              data=command))
 
703
                # The checker may have completed before the gobject
 
704
                # watch was added.  Check for this.
 
705
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
 
706
                if pid:
 
707
                    gobject.source_remove(self.checker_callback_tag)
 
708
                    self.checker_callback(pid, status, command)
 
709
            except OSError as error:
 
710
                logger.error("Failed to start subprocess: %s",
356
711
                             error)
357
712
        # Re-run this periodically if run by gobject.timeout_add
358
713
        return True
 
714
    
359
715
    def stop_checker(self):
360
716
        """Force the checker process, if any, to stop."""
361
717
        if self.checker_callback_tag:
363
719
            self.checker_callback_tag = None
364
720
        if getattr(self, "checker", None) is None:
365
721
            return
366
 
        logger.debug(u"Stopping checker for %(name)s", vars(self))
 
722
        logger.debug("Stopping checker for %(name)s", vars(self))
367
723
        try:
368
724
            os.kill(self.checker.pid, signal.SIGTERM)
369
 
            #os.sleep(0.5)
 
725
            #time.sleep(0.5)
370
726
            #if self.checker.poll() is None:
371
727
            #    os.kill(self.checker.pid, signal.SIGKILL)
372
 
        except OSError, error:
 
728
        except OSError as error:
373
729
            if error.errno != errno.ESRCH: # No such process
374
730
                raise
375
731
        self.checker = None
376
 
    def still_valid(self):
377
 
        """Has the timeout not yet passed for this client?"""
378
 
        now = datetime.datetime.now()
379
 
        if self.last_checked_ok is None:
380
 
            return now < (self.created + self.timeout)
381
 
        else:
382
 
            return now < (self.last_checked_ok + self.timeout)
383
 
 
384
 
 
385
 
def peer_certificate(session):
386
 
    "Return the peer's OpenPGP certificate as a bytestring"
387
 
    # If not an OpenPGP certificate...
388
 
    if gnutls.library.functions.gnutls_certificate_type_get\
389
 
            (session._c_object) \
390
 
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
391
 
        # ...do the normal thing
392
 
        return session.peer_certificate
393
 
    list_size = ctypes.c_uint()
394
 
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
395
 
        (session._c_object, ctypes.byref(list_size))
396
 
    if list_size.value == 0:
397
 
        return None
398
 
    cert = cert_list[0]
399
 
    return ctypes.string_at(cert.data, cert.size)
400
 
 
401
 
 
402
 
def fingerprint(openpgp):
403
 
    "Convert an OpenPGP bytestring to a hexdigit fingerprint string"
404
 
    # New GnuTLS "datum" with the OpenPGP public key
405
 
    datum = gnutls.library.types.gnutls_datum_t\
406
 
        (ctypes.cast(ctypes.c_char_p(openpgp),
407
 
                     ctypes.POINTER(ctypes.c_ubyte)),
408
 
         ctypes.c_uint(len(openpgp)))
409
 
    # New empty GnuTLS certificate
410
 
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
411
 
    gnutls.library.functions.gnutls_openpgp_crt_init\
412
 
        (ctypes.byref(crt))
413
 
    # Import the OpenPGP public key into the certificate
414
 
    gnutls.library.functions.gnutls_openpgp_crt_import\
415
 
                    (crt, ctypes.byref(datum),
416
 
                     gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
417
 
    # Verify the self signature in the key
418
 
    crtverify = ctypes.c_uint();
419
 
    gnutls.library.functions.gnutls_openpgp_crt_verify_self\
420
 
        (crt, 0, ctypes.byref(crtverify))
421
 
    if crtverify.value != 0:
422
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
423
 
        raise gnutls.errors.CertificateSecurityError("Verify failed")
424
 
    # New buffer for the fingerprint
425
 
    buffer = ctypes.create_string_buffer(20)
426
 
    buffer_length = ctypes.c_size_t()
427
 
    # Get the fingerprint from the certificate into the buffer
428
 
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
429
 
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
430
 
    # Deinit the certificate
431
 
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
432
 
    # Convert the buffer to a Python bytestring
433
 
    fpr = ctypes.string_at(buffer, buffer_length.value)
434
 
    # Convert the bytestring to hexadecimal notation
435
 
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
436
 
    return hex_fpr
437
 
 
438
 
 
439
 
class tcp_handler(SocketServer.BaseRequestHandler, object):
440
 
    """A TCP request handler class.
441
 
    Instantiated by IPv6_TCPServer for each request to handle it.
 
732
 
 
733
 
 
734
def dbus_service_property(dbus_interface, signature="v",
 
735
                          access="readwrite", byte_arrays=False):
 
736
    """Decorators for marking methods of a DBusObjectWithProperties to
 
737
    become properties on the D-Bus.
 
738
    
 
739
    The decorated method will be called with no arguments by "Get"
 
740
    and with one argument by "Set".
 
741
    
 
742
    The parameters, where they are supported, are the same as
 
743
    dbus.service.method, except there is only "signature", since the
 
744
    type from Get() and the type sent to Set() is the same.
 
745
    """
 
746
    # Encoding deeply encoded byte arrays is not supported yet by the
 
747
    # "Set" method, so we fail early here:
 
748
    if byte_arrays and signature != "ay":
 
749
        raise ValueError("Byte arrays not supported for non-'ay'"
 
750
                         " signature %r" % signature)
 
751
    def decorator(func):
 
752
        func._dbus_is_property = True
 
753
        func._dbus_interface = dbus_interface
 
754
        func._dbus_signature = signature
 
755
        func._dbus_access = access
 
756
        func._dbus_name = func.__name__
 
757
        if func._dbus_name.endswith("_dbus_property"):
 
758
            func._dbus_name = func._dbus_name[:-14]
 
759
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
 
760
        return func
 
761
    return decorator
 
762
 
 
763
 
 
764
class DBusPropertyException(dbus.exceptions.DBusException):
 
765
    """A base class for D-Bus property-related exceptions
 
766
    """
 
767
    def __unicode__(self):
 
768
        return unicode(str(self))
 
769
 
 
770
 
 
771
class DBusPropertyAccessException(DBusPropertyException):
 
772
    """A property's access permissions disallows an operation.
 
773
    """
 
774
    pass
 
775
 
 
776
 
 
777
class DBusPropertyNotFound(DBusPropertyException):
 
778
    """An attempt was made to access a non-existing property.
 
779
    """
 
780
    pass
 
781
 
 
782
 
 
783
class DBusObjectWithProperties(dbus.service.Object):
 
784
    """A D-Bus object with properties.
 
785
    
 
786
    Classes inheriting from this can use the dbus_service_property
 
787
    decorator to expose methods as D-Bus properties.  It exposes the
 
788
    standard Get(), Set(), and GetAll() methods on the D-Bus.
 
789
    """
 
790
    
 
791
    @staticmethod
 
792
    def _is_dbus_property(obj):
 
793
        return getattr(obj, "_dbus_is_property", False)
 
794
    
 
795
    def _get_all_dbus_properties(self):
 
796
        """Returns a generator of (name, attribute) pairs
 
797
        """
 
798
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
 
799
                for cls in self.__class__.__mro__
 
800
                for name, prop in
 
801
                inspect.getmembers(cls, self._is_dbus_property))
 
802
    
 
803
    def _get_dbus_property(self, interface_name, property_name):
 
804
        """Returns a bound method if one exists which is a D-Bus
 
805
        property with the specified name and interface.
 
806
        """
 
807
        for cls in  self.__class__.__mro__:
 
808
            for name, value in (inspect.getmembers
 
809
                                (cls, self._is_dbus_property)):
 
810
                if (value._dbus_name == property_name
 
811
                    and value._dbus_interface == interface_name):
 
812
                    return value.__get__(self)
 
813
        
 
814
        # No such property
 
815
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
 
816
                                   + interface_name + "."
 
817
                                   + property_name)
 
818
    
 
819
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
 
820
                         out_signature="v")
 
821
    def Get(self, interface_name, property_name):
 
822
        """Standard D-Bus property Get() method, see D-Bus standard.
 
823
        """
 
824
        prop = self._get_dbus_property(interface_name, property_name)
 
825
        if prop._dbus_access == "write":
 
826
            raise DBusPropertyAccessException(property_name)
 
827
        value = prop()
 
828
        if not hasattr(value, "variant_level"):
 
829
            return value
 
830
        return type(value)(value, variant_level=value.variant_level+1)
 
831
    
 
832
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
 
833
    def Set(self, interface_name, property_name, value):
 
834
        """Standard D-Bus property Set() method, see D-Bus standard.
 
835
        """
 
836
        prop = self._get_dbus_property(interface_name, property_name)
 
837
        if prop._dbus_access == "read":
 
838
            raise DBusPropertyAccessException(property_name)
 
839
        if prop._dbus_get_args_options["byte_arrays"]:
 
840
            # The byte_arrays option is not supported yet on
 
841
            # signatures other than "ay".
 
842
            if prop._dbus_signature != "ay":
 
843
                raise ValueError
 
844
            value = dbus.ByteArray(''.join(unichr(byte)
 
845
                                           for byte in value))
 
846
        prop(value)
 
847
    
 
848
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
 
849
                         out_signature="a{sv}")
 
850
    def GetAll(self, interface_name):
 
851
        """Standard D-Bus property GetAll() method, see D-Bus
 
852
        standard.
 
853
        
 
854
        Note: Will not include properties with access="write".
 
855
        """
 
856
        properties = {}
 
857
        for name, prop in self._get_all_dbus_properties():
 
858
            if (interface_name
 
859
                and interface_name != prop._dbus_interface):
 
860
                # Interface non-empty but did not match
 
861
                continue
 
862
            # Ignore write-only properties
 
863
            if prop._dbus_access == "write":
 
864
                continue
 
865
            value = prop()
 
866
            if not hasattr(value, "variant_level"):
 
867
                properties[name] = value
 
868
                continue
 
869
            properties[name] = type(value)(value, variant_level=
 
870
                                           value.variant_level+1)
 
871
        return dbus.Dictionary(properties, signature="sv")
 
872
    
 
873
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
 
874
                         out_signature="s",
 
875
                         path_keyword='object_path',
 
876
                         connection_keyword='connection')
 
877
    def Introspect(self, object_path, connection):
 
878
        """Standard D-Bus method, overloaded to insert property tags.
 
879
        """
 
880
        xmlstring = dbus.service.Object.Introspect(self, object_path,
 
881
                                                   connection)
 
882
        try:
 
883
            document = xml.dom.minidom.parseString(xmlstring)
 
884
            def make_tag(document, name, prop):
 
885
                e = document.createElement("property")
 
886
                e.setAttribute("name", name)
 
887
                e.setAttribute("type", prop._dbus_signature)
 
888
                e.setAttribute("access", prop._dbus_access)
 
889
                return e
 
890
            for if_tag in document.getElementsByTagName("interface"):
 
891
                for tag in (make_tag(document, name, prop)
 
892
                            for name, prop
 
893
                            in self._get_all_dbus_properties()
 
894
                            if prop._dbus_interface
 
895
                            == if_tag.getAttribute("name")):
 
896
                    if_tag.appendChild(tag)
 
897
                # Add the names to the return values for the
 
898
                # "org.freedesktop.DBus.Properties" methods
 
899
                if (if_tag.getAttribute("name")
 
900
                    == "org.freedesktop.DBus.Properties"):
 
901
                    for cn in if_tag.getElementsByTagName("method"):
 
902
                        if cn.getAttribute("name") == "Get":
 
903
                            for arg in cn.getElementsByTagName("arg"):
 
904
                                if (arg.getAttribute("direction")
 
905
                                    == "out"):
 
906
                                    arg.setAttribute("name", "value")
 
907
                        elif cn.getAttribute("name") == "GetAll":
 
908
                            for arg in cn.getElementsByTagName("arg"):
 
909
                                if (arg.getAttribute("direction")
 
910
                                    == "out"):
 
911
                                    arg.setAttribute("name", "props")
 
912
            xmlstring = document.toxml("utf-8")
 
913
            document.unlink()
 
914
        except (AttributeError, xml.dom.DOMException,
 
915
                xml.parsers.expat.ExpatError) as error:
 
916
            logger.error("Failed to override Introspection method",
 
917
                         error)
 
918
        return xmlstring
 
919
 
 
920
 
 
921
def datetime_to_dbus (dt, variant_level=0):
 
922
    """Convert a UTC datetime.datetime() to a D-Bus type."""
 
923
    if dt is None:
 
924
        return dbus.String("", variant_level = variant_level)
 
925
    return dbus.String(dt.isoformat(),
 
926
                       variant_level=variant_level)
 
927
 
 
928
 
 
929
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
 
930
                                  .__metaclass__):
 
931
    """Applied to an empty subclass of a D-Bus object, this metaclass
 
932
    will add additional D-Bus attributes matching a certain pattern.
 
933
    """
 
934
    def __new__(mcs, name, bases, attr):
 
935
        # Go through all the base classes which could have D-Bus
 
936
        # methods, signals, or properties in them
 
937
        for base in (b for b in bases
 
938
                     if issubclass(b, dbus.service.Object)):
 
939
            # Go though all attributes of the base class
 
940
            for attrname, attribute in inspect.getmembers(base):
 
941
                # Ignore non-D-Bus attributes, and D-Bus attributes
 
942
                # with the wrong interface name
 
943
                if (not hasattr(attribute, "_dbus_interface")
 
944
                    or not attribute._dbus_interface
 
945
                    .startswith("se.recompile.Mandos")):
 
946
                    continue
 
947
                # Create an alternate D-Bus interface name based on
 
948
                # the current name
 
949
                alt_interface = (attribute._dbus_interface
 
950
                                 .replace("se.recompile.Mandos",
 
951
                                          "se.bsnet.fukt.Mandos"))
 
952
                # Is this a D-Bus signal?
 
953
                if getattr(attribute, "_dbus_is_signal", False):
 
954
                    # Extract the original non-method function by
 
955
                    # black magic
 
956
                    nonmethod_func = (dict(
 
957
                            zip(attribute.func_code.co_freevars,
 
958
                                attribute.__closure__))["func"]
 
959
                                      .cell_contents)
 
960
                    # Create a new, but exactly alike, function
 
961
                    # object, and decorate it to be a new D-Bus signal
 
962
                    # with the alternate D-Bus interface name
 
963
                    new_function = (dbus.service.signal
 
964
                                    (alt_interface,
 
965
                                     attribute._dbus_signature)
 
966
                                    (types.FunctionType(
 
967
                                nonmethod_func.func_code,
 
968
                                nonmethod_func.func_globals,
 
969
                                nonmethod_func.func_name,
 
970
                                nonmethod_func.func_defaults,
 
971
                                nonmethod_func.func_closure)))
 
972
                    # Define a creator of a function to call both the
 
973
                    # old and new functions, so both the old and new
 
974
                    # signals gets sent when the function is called
 
975
                    def fixscope(func1, func2):
 
976
                        """This function is a scope container to pass
 
977
                        func1 and func2 to the "call_both" function
 
978
                        outside of its arguments"""
 
979
                        def call_both(*args, **kwargs):
 
980
                            """This function will emit two D-Bus
 
981
                            signals by calling func1 and func2"""
 
982
                            func1(*args, **kwargs)
 
983
                            func2(*args, **kwargs)
 
984
                        return call_both
 
985
                    # Create the "call_both" function and add it to
 
986
                    # the class
 
987
                    attr[attrname] = fixscope(attribute,
 
988
                                              new_function)
 
989
                # Is this a D-Bus method?
 
990
                elif getattr(attribute, "_dbus_is_method", False):
 
991
                    # Create a new, but exactly alike, function
 
992
                    # object.  Decorate it to be a new D-Bus method
 
993
                    # with the alternate D-Bus interface name.  Add it
 
994
                    # to the class.
 
995
                    attr[attrname] = (dbus.service.method
 
996
                                      (alt_interface,
 
997
                                       attribute._dbus_in_signature,
 
998
                                       attribute._dbus_out_signature)
 
999
                                      (types.FunctionType
 
1000
                                       (attribute.func_code,
 
1001
                                        attribute.func_globals,
 
1002
                                        attribute.func_name,
 
1003
                                        attribute.func_defaults,
 
1004
                                        attribute.func_closure)))
 
1005
                # Is this a D-Bus property?
 
1006
                elif getattr(attribute, "_dbus_is_property", False):
 
1007
                    # Create a new, but exactly alike, function
 
1008
                    # object, and decorate it to be a new D-Bus
 
1009
                    # property with the alternate D-Bus interface
 
1010
                    # name.  Add it to the class.
 
1011
                    attr[attrname] = (dbus_service_property
 
1012
                                      (alt_interface,
 
1013
                                       attribute._dbus_signature,
 
1014
                                       attribute._dbus_access,
 
1015
                                       attribute
 
1016
                                       ._dbus_get_args_options
 
1017
                                       ["byte_arrays"])
 
1018
                                      (types.FunctionType
 
1019
                                       (attribute.func_code,
 
1020
                                        attribute.func_globals,
 
1021
                                        attribute.func_name,
 
1022
                                        attribute.func_defaults,
 
1023
                                        attribute.func_closure)))
 
1024
        return type.__new__(mcs, name, bases, attr)
 
1025
 
 
1026
 
 
1027
class ClientDBus(Client, DBusObjectWithProperties):
 
1028
    """A Client class using D-Bus
 
1029
    
 
1030
    Attributes:
 
1031
    dbus_object_path: dbus.ObjectPath
 
1032
    bus: dbus.SystemBus()
 
1033
    """
 
1034
    
 
1035
    runtime_expansions = (Client.runtime_expansions
 
1036
                          + ("dbus_object_path",))
 
1037
    
 
1038
    # dbus.service.Object doesn't use super(), so we can't either.
 
1039
    
 
1040
    def __init__(self, bus = None, *args, **kwargs):
 
1041
        self.bus = bus
 
1042
        Client.__init__(self, *args, **kwargs)
 
1043
        self._approvals_pending = 0
 
1044
        
 
1045
        self._approvals_pending = 0
 
1046
        # Only now, when this client is initialized, can it show up on
 
1047
        # the D-Bus
 
1048
        client_object_name = unicode(self.name).translate(
 
1049
            {ord("."): ord("_"),
 
1050
             ord("-"): ord("_")})
 
1051
        self.dbus_object_path = (dbus.ObjectPath
 
1052
                                 ("/clients/" + client_object_name))
 
1053
        DBusObjectWithProperties.__init__(self, self.bus,
 
1054
                                          self.dbus_object_path)
 
1055
        
 
1056
    def notifychangeproperty(transform_func,
 
1057
                             dbus_name, type_func=lambda x: x,
 
1058
                             variant_level=1):
 
1059
        """ Modify a variable so that it's a property which announces
 
1060
        its changes to DBus.
 
1061
        
 
1062
        transform_fun: Function that takes a value and a variant_level
 
1063
                       and transforms it to a D-Bus type.
 
1064
        dbus_name: D-Bus name of the variable
 
1065
        type_func: Function that transform the value before sending it
 
1066
                   to the D-Bus.  Default: no transform
 
1067
        variant_level: D-Bus variant level.  Default: 1
 
1068
        """
 
1069
        attrname = "_{0}".format(dbus_name)
 
1070
        def setter(self, value):
 
1071
            if hasattr(self, "dbus_object_path"):
 
1072
                if (not hasattr(self, attrname) or
 
1073
                    type_func(getattr(self, attrname, None))
 
1074
                    != type_func(value)):
 
1075
                    dbus_value = transform_func(type_func(value),
 
1076
                                                variant_level
 
1077
                                                =variant_level)
 
1078
                    self.PropertyChanged(dbus.String(dbus_name),
 
1079
                                         dbus_value)
 
1080
            setattr(self, attrname, value)
 
1081
        
 
1082
        return property(lambda self: getattr(self, attrname), setter)
 
1083
    
 
1084
    
 
1085
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
 
1086
    approvals_pending = notifychangeproperty(dbus.Boolean,
 
1087
                                             "ApprovalPending",
 
1088
                                             type_func = bool)
 
1089
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
 
1090
    last_enabled = notifychangeproperty(datetime_to_dbus,
 
1091
                                        "LastEnabled")
 
1092
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
 
1093
                                   type_func = lambda checker:
 
1094
                                       checker is not None)
 
1095
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
 
1096
                                           "LastCheckedOK")
 
1097
    last_approval_request = notifychangeproperty(
 
1098
        datetime_to_dbus, "LastApprovalRequest")
 
1099
    approved_by_default = notifychangeproperty(dbus.Boolean,
 
1100
                                               "ApprovedByDefault")
 
1101
    approval_delay = notifychangeproperty(dbus.UInt64,
 
1102
                                          "ApprovalDelay",
 
1103
                                          type_func =
 
1104
                                          timedelta_to_milliseconds)
 
1105
    approval_duration = notifychangeproperty(
 
1106
        dbus.UInt64, "ApprovalDuration",
 
1107
        type_func = timedelta_to_milliseconds)
 
1108
    host = notifychangeproperty(dbus.String, "Host")
 
1109
    timeout = notifychangeproperty(dbus.UInt64, "Timeout",
 
1110
                                   type_func =
 
1111
                                   timedelta_to_milliseconds)
 
1112
    extended_timeout = notifychangeproperty(
 
1113
        dbus.UInt64, "ExtendedTimeout",
 
1114
        type_func = timedelta_to_milliseconds)
 
1115
    interval = notifychangeproperty(dbus.UInt64,
 
1116
                                    "Interval",
 
1117
                                    type_func =
 
1118
                                    timedelta_to_milliseconds)
 
1119
    checker_command = notifychangeproperty(dbus.String, "Checker")
 
1120
    
 
1121
    del notifychangeproperty
 
1122
    
 
1123
    def __del__(self, *args, **kwargs):
 
1124
        try:
 
1125
            self.remove_from_connection()
 
1126
        except LookupError:
 
1127
            pass
 
1128
        if hasattr(DBusObjectWithProperties, "__del__"):
 
1129
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
 
1130
        Client.__del__(self, *args, **kwargs)
 
1131
    
 
1132
    def checker_callback(self, pid, condition, command,
 
1133
                         *args, **kwargs):
 
1134
        self.checker_callback_tag = None
 
1135
        self.checker = None
 
1136
        if os.WIFEXITED(condition):
 
1137
            exitstatus = os.WEXITSTATUS(condition)
 
1138
            # Emit D-Bus signal
 
1139
            self.CheckerCompleted(dbus.Int16(exitstatus),
 
1140
                                  dbus.Int64(condition),
 
1141
                                  dbus.String(command))
 
1142
        else:
 
1143
            # Emit D-Bus signal
 
1144
            self.CheckerCompleted(dbus.Int16(-1),
 
1145
                                  dbus.Int64(condition),
 
1146
                                  dbus.String(command))
 
1147
        
 
1148
        return Client.checker_callback(self, pid, condition, command,
 
1149
                                       *args, **kwargs)
 
1150
    
 
1151
    def start_checker(self, *args, **kwargs):
 
1152
        old_checker = self.checker
 
1153
        if self.checker is not None:
 
1154
            old_checker_pid = self.checker.pid
 
1155
        else:
 
1156
            old_checker_pid = None
 
1157
        r = Client.start_checker(self, *args, **kwargs)
 
1158
        # Only if new checker process was started
 
1159
        if (self.checker is not None
 
1160
            and old_checker_pid != self.checker.pid):
 
1161
            # Emit D-Bus signal
 
1162
            self.CheckerStarted(self.current_checker_command)
 
1163
        return r
 
1164
    
 
1165
    def _reset_approved(self):
 
1166
        self.approved = None
 
1167
        return False
 
1168
    
 
1169
    def approve(self, value=True):
 
1170
        self.send_changedstate()
 
1171
        self.approved = value
 
1172
        gobject.timeout_add(timedelta_to_milliseconds
 
1173
                            (self.approval_duration),
 
1174
                            self._reset_approved)
 
1175
    
 
1176
    
 
1177
    ## D-Bus methods, signals & properties
 
1178
    _interface = "se.recompile.Mandos.Client"
 
1179
    
 
1180
    ## Signals
 
1181
    
 
1182
    # CheckerCompleted - signal
 
1183
    @dbus.service.signal(_interface, signature="nxs")
 
1184
    def CheckerCompleted(self, exitcode, waitstatus, command):
 
1185
        "D-Bus signal"
 
1186
        pass
 
1187
    
 
1188
    # CheckerStarted - signal
 
1189
    @dbus.service.signal(_interface, signature="s")
 
1190
    def CheckerStarted(self, command):
 
1191
        "D-Bus signal"
 
1192
        pass
 
1193
    
 
1194
    # PropertyChanged - signal
 
1195
    @dbus.service.signal(_interface, signature="sv")
 
1196
    def PropertyChanged(self, property, value):
 
1197
        "D-Bus signal"
 
1198
        pass
 
1199
    
 
1200
    # GotSecret - signal
 
1201
    @dbus.service.signal(_interface)
 
1202
    def GotSecret(self):
 
1203
        """D-Bus signal
 
1204
        Is sent after a successful transfer of secret from the Mandos
 
1205
        server to mandos-client
 
1206
        """
 
1207
        pass
 
1208
    
 
1209
    # Rejected - signal
 
1210
    @dbus.service.signal(_interface, signature="s")
 
1211
    def Rejected(self, reason):
 
1212
        "D-Bus signal"
 
1213
        pass
 
1214
    
 
1215
    # NeedApproval - signal
 
1216
    @dbus.service.signal(_interface, signature="tb")
 
1217
    def NeedApproval(self, timeout, default):
 
1218
        "D-Bus signal"
 
1219
        return self.need_approval()
 
1220
    
 
1221
    # NeRwequest - signal
 
1222
    @dbus.service.signal(_interface, signature="s")
 
1223
    def NewRequest(self, ip):
 
1224
        """D-Bus signal
 
1225
        Is sent after a client request a password.
 
1226
        """
 
1227
        pass
 
1228
    
 
1229
    ## Methods
 
1230
    
 
1231
    # Approve - method
 
1232
    @dbus.service.method(_interface, in_signature="b")
 
1233
    def Approve(self, value):
 
1234
        self.approve(value)
 
1235
    
 
1236
    # CheckedOK - method
 
1237
    @dbus.service.method(_interface)
 
1238
    def CheckedOK(self):
 
1239
        self.checked_ok()
 
1240
    
 
1241
    # Enable - method
 
1242
    @dbus.service.method(_interface)
 
1243
    def Enable(self):
 
1244
        "D-Bus method"
 
1245
        self.enable()
 
1246
    
 
1247
    # StartChecker - method
 
1248
    @dbus.service.method(_interface)
 
1249
    def StartChecker(self):
 
1250
        "D-Bus method"
 
1251
        self.start_checker()
 
1252
    
 
1253
    # Disable - method
 
1254
    @dbus.service.method(_interface)
 
1255
    def Disable(self):
 
1256
        "D-Bus method"
 
1257
        self.disable()
 
1258
    
 
1259
    # StopChecker - method
 
1260
    @dbus.service.method(_interface)
 
1261
    def StopChecker(self):
 
1262
        self.stop_checker()
 
1263
    
 
1264
    ## Properties
 
1265
    
 
1266
    # ApprovalPending - property
 
1267
    @dbus_service_property(_interface, signature="b", access="read")
 
1268
    def ApprovalPending_dbus_property(self):
 
1269
        return dbus.Boolean(bool(self.approvals_pending))
 
1270
    
 
1271
    # ApprovedByDefault - property
 
1272
    @dbus_service_property(_interface, signature="b",
 
1273
                           access="readwrite")
 
1274
    def ApprovedByDefault_dbus_property(self, value=None):
 
1275
        if value is None:       # get
 
1276
            return dbus.Boolean(self.approved_by_default)
 
1277
        self.approved_by_default = bool(value)
 
1278
    
 
1279
    # ApprovalDelay - property
 
1280
    @dbus_service_property(_interface, signature="t",
 
1281
                           access="readwrite")
 
1282
    def ApprovalDelay_dbus_property(self, value=None):
 
1283
        if value is None:       # get
 
1284
            return dbus.UInt64(self.approval_delay_milliseconds())
 
1285
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
 
1286
    
 
1287
    # ApprovalDuration - property
 
1288
    @dbus_service_property(_interface, signature="t",
 
1289
                           access="readwrite")
 
1290
    def ApprovalDuration_dbus_property(self, value=None):
 
1291
        if value is None:       # get
 
1292
            return dbus.UInt64(timedelta_to_milliseconds(
 
1293
                    self.approval_duration))
 
1294
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
 
1295
    
 
1296
    # Name - property
 
1297
    @dbus_service_property(_interface, signature="s", access="read")
 
1298
    def Name_dbus_property(self):
 
1299
        return dbus.String(self.name)
 
1300
    
 
1301
    # Fingerprint - property
 
1302
    @dbus_service_property(_interface, signature="s", access="read")
 
1303
    def Fingerprint_dbus_property(self):
 
1304
        return dbus.String(self.fingerprint)
 
1305
    
 
1306
    # Host - property
 
1307
    @dbus_service_property(_interface, signature="s",
 
1308
                           access="readwrite")
 
1309
    def Host_dbus_property(self, value=None):
 
1310
        if value is None:       # get
 
1311
            return dbus.String(self.host)
 
1312
        self.host = unicode(value)
 
1313
    
 
1314
    # Created - property
 
1315
    @dbus_service_property(_interface, signature="s", access="read")
 
1316
    def Created_dbus_property(self):
 
1317
        return datetime_to_dbus(self.created)
 
1318
    
 
1319
    # LastEnabled - property
 
1320
    @dbus_service_property(_interface, signature="s", access="read")
 
1321
    def LastEnabled_dbus_property(self):
 
1322
        return datetime_to_dbus(self.last_enabled)
 
1323
    
 
1324
    # Enabled - property
 
1325
    @dbus_service_property(_interface, signature="b",
 
1326
                           access="readwrite")
 
1327
    def Enabled_dbus_property(self, value=None):
 
1328
        if value is None:       # get
 
1329
            return dbus.Boolean(self.enabled)
 
1330
        if value:
 
1331
            self.enable()
 
1332
        else:
 
1333
            self.disable()
 
1334
    
 
1335
    # LastCheckedOK - property
 
1336
    @dbus_service_property(_interface, signature="s",
 
1337
                           access="readwrite")
 
1338
    def LastCheckedOK_dbus_property(self, value=None):
 
1339
        if value is not None:
 
1340
            self.checked_ok()
 
1341
            return
 
1342
        return datetime_to_dbus(self.last_checked_ok)
 
1343
    
 
1344
    # Expires - property
 
1345
    @dbus_service_property(_interface, signature="s", access="read")
 
1346
    def Expires_dbus_property(self):
 
1347
        return datetime_to_dbus(self.expires)
 
1348
    
 
1349
    # LastApprovalRequest - property
 
1350
    @dbus_service_property(_interface, signature="s", access="read")
 
1351
    def LastApprovalRequest_dbus_property(self):
 
1352
        return datetime_to_dbus(self.last_approval_request)
 
1353
    
 
1354
    # Timeout - property
 
1355
    @dbus_service_property(_interface, signature="t",
 
1356
                           access="readwrite")
 
1357
    def Timeout_dbus_property(self, value=None):
 
1358
        if value is None:       # get
 
1359
            return dbus.UInt64(self.timeout_milliseconds())
 
1360
        self.timeout = datetime.timedelta(0, 0, 0, value)
 
1361
        if getattr(self, "disable_initiator_tag", None) is None:
 
1362
            return
 
1363
        # Reschedule timeout
 
1364
        gobject.source_remove(self.disable_initiator_tag)
 
1365
        self.disable_initiator_tag = None
 
1366
        self.expires = None
 
1367
        time_to_die = timedelta_to_milliseconds((self
 
1368
                                                 .last_checked_ok
 
1369
                                                 + self.timeout)
 
1370
                                                - datetime.datetime
 
1371
                                                .utcnow())
 
1372
        if time_to_die <= 0:
 
1373
            # The timeout has passed
 
1374
            self.disable()
 
1375
        else:
 
1376
            self.expires = (datetime.datetime.utcnow()
 
1377
                            + datetime.timedelta(milliseconds =
 
1378
                                                 time_to_die))
 
1379
            self.disable_initiator_tag = (gobject.timeout_add
 
1380
                                          (time_to_die, self.disable))
 
1381
    
 
1382
    # ExtendedTimeout - property
 
1383
    @dbus_service_property(_interface, signature="t",
 
1384
                           access="readwrite")
 
1385
    def ExtendedTimeout_dbus_property(self, value=None):
 
1386
        if value is None:       # get
 
1387
            return dbus.UInt64(self.extended_timeout_milliseconds())
 
1388
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
 
1389
    
 
1390
    # Interval - property
 
1391
    @dbus_service_property(_interface, signature="t",
 
1392
                           access="readwrite")
 
1393
    def Interval_dbus_property(self, value=None):
 
1394
        if value is None:       # get
 
1395
            return dbus.UInt64(self.interval_milliseconds())
 
1396
        self.interval = datetime.timedelta(0, 0, 0, value)
 
1397
        if getattr(self, "checker_initiator_tag", None) is None:
 
1398
            return
 
1399
        if self.enabled:
 
1400
            # Reschedule checker run
 
1401
            gobject.source_remove(self.checker_initiator_tag)
 
1402
            self.checker_initiator_tag = (gobject.timeout_add
 
1403
                                          (value, self.start_checker))
 
1404
            self.start_checker()    # Start one now, too
 
1405
    
 
1406
    # Checker - property
 
1407
    @dbus_service_property(_interface, signature="s",
 
1408
                           access="readwrite")
 
1409
    def Checker_dbus_property(self, value=None):
 
1410
        if value is None:       # get
 
1411
            return dbus.String(self.checker_command)
 
1412
        self.checker_command = unicode(value)
 
1413
    
 
1414
    # CheckerRunning - property
 
1415
    @dbus_service_property(_interface, signature="b",
 
1416
                           access="readwrite")
 
1417
    def CheckerRunning_dbus_property(self, value=None):
 
1418
        if value is None:       # get
 
1419
            return dbus.Boolean(self.checker is not None)
 
1420
        if value:
 
1421
            self.start_checker()
 
1422
        else:
 
1423
            self.stop_checker()
 
1424
    
 
1425
    # ObjectPath - property
 
1426
    @dbus_service_property(_interface, signature="o", access="read")
 
1427
    def ObjectPath_dbus_property(self):
 
1428
        return self.dbus_object_path # is already a dbus.ObjectPath
 
1429
    
 
1430
    # Secret = property
 
1431
    @dbus_service_property(_interface, signature="ay",
 
1432
                           access="write", byte_arrays=True)
 
1433
    def Secret_dbus_property(self, value):
 
1434
        self.secret = str(value)
 
1435
    
 
1436
    del _interface
 
1437
 
 
1438
 
 
1439
class ProxyClient(object):
 
1440
    def __init__(self, child_pipe, fpr, address):
 
1441
        self._pipe = child_pipe
 
1442
        self._pipe.send(('init', fpr, address))
 
1443
        if not self._pipe.recv():
 
1444
            raise KeyError()
 
1445
    
 
1446
    def __getattribute__(self, name):
 
1447
        if name == '_pipe':
 
1448
            return super(ProxyClient, self).__getattribute__(name)
 
1449
        self._pipe.send(('getattr', name))
 
1450
        data = self._pipe.recv()
 
1451
        if data[0] == 'data':
 
1452
            return data[1]
 
1453
        if data[0] == 'function':
 
1454
            def func(*args, **kwargs):
 
1455
                self._pipe.send(('funcall', name, args, kwargs))
 
1456
                return self._pipe.recv()[1]
 
1457
            return func
 
1458
    
 
1459
    def __setattr__(self, name, value):
 
1460
        if name == '_pipe':
 
1461
            return super(ProxyClient, self).__setattr__(name, value)
 
1462
        self._pipe.send(('setattr', name, value))
 
1463
 
 
1464
 
 
1465
class ClientDBusTransitional(ClientDBus):
 
1466
    __metaclass__ = AlternateDBusNamesMetaclass
 
1467
 
 
1468
 
 
1469
class ClientHandler(socketserver.BaseRequestHandler, object):
 
1470
    """A class to handle client connections.
 
1471
    
 
1472
    Instantiated once for each connection to handle it.
442
1473
    Note: This will run in its own forked process."""
443
1474
    
444
1475
    def handle(self):
445
 
        logger.info(u"TCP connection from: %s",
446
 
                     unicode(self.client_address))
447
 
        session = gnutls.connection.ClientSession\
448
 
                  (self.request, gnutls.connection.X509Credentials())
449
 
        
450
 
        line = self.request.makefile().readline()
451
 
        logger.debug(u"Protocol version: %r", line)
452
 
        try:
453
 
            if int(line.strip().split()[0]) > 1:
454
 
                raise RuntimeError
455
 
        except (ValueError, IndexError, RuntimeError), error:
456
 
            logger.error(u"Unknown protocol version: %s", error)
457
 
            return
458
 
        
459
 
        # Note: gnutls.connection.X509Credentials is really a generic
460
 
        # GnuTLS certificate credentials object so long as no X.509
461
 
        # keys are added to it.  Therefore, we can use it here despite
462
 
        # using OpenPGP certificates.
463
 
        
464
 
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
465
 
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
466
 
        #                "+DHE-DSS"))
467
 
        priority = "NORMAL"             # Fallback default, since this
468
 
                                        # MUST be set.
469
 
        if self.server.settings["priority"]:
470
 
            priority = self.server.settings["priority"]
471
 
        gnutls.library.functions.gnutls_priority_set_direct\
472
 
            (session._c_object, priority, None);
473
 
        
474
 
        try:
475
 
            session.handshake()
476
 
        except gnutls.errors.GNUTLSError, error:
477
 
            logger.warning(u"Handshake failed: %s", error)
478
 
            # Do not run session.bye() here: the session is not
479
 
            # established.  Just abandon the request.
480
 
            return
481
 
        try:
482
 
            fpr = fingerprint(peer_certificate(session))
483
 
        except (TypeError, gnutls.errors.GNUTLSError), error:
484
 
            logger.warning(u"Bad certificate: %s", error)
485
 
            session.bye()
486
 
            return
487
 
        logger.debug(u"Fingerprint: %s", fpr)
488
 
        client = None
489
 
        for c in self.server.clients:
490
 
            if c.fingerprint == fpr:
491
 
                client = c
492
 
                break
493
 
        if not client:
494
 
            logger.warning(u"Client not found for fingerprint: %s",
495
 
                           fpr)
496
 
            session.bye()
497
 
            return
498
 
        # Have to check if client.still_valid(), since it is possible
499
 
        # that the client timed out while establishing the GnuTLS
500
 
        # session.
501
 
        if not client.still_valid():
502
 
            logger.warning(u"Client %(name)s is invalid",
503
 
                           vars(client))
504
 
            session.bye()
505
 
            return
506
 
        sent_size = 0
507
 
        while sent_size < len(client.secret):
508
 
            sent = session.send(client.secret[sent_size:])
509
 
            logger.debug(u"Sent: %d, remaining: %d",
510
 
                         sent, len(client.secret)
511
 
                         - (sent_size + sent))
512
 
            sent_size += sent
513
 
        session.bye()
514
 
 
515
 
 
516
 
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
517
 
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
 
1476
        with contextlib.closing(self.server.child_pipe) as child_pipe:
 
1477
            logger.info("TCP connection from: %s",
 
1478
                        unicode(self.client_address))
 
1479
            logger.debug("Pipe FD: %d",
 
1480
                         self.server.child_pipe.fileno())
 
1481
            
 
1482
            session = (gnutls.connection
 
1483
                       .ClientSession(self.request,
 
1484
                                      gnutls.connection
 
1485
                                      .X509Credentials()))
 
1486
            
 
1487
            # Note: gnutls.connection.X509Credentials is really a
 
1488
            # generic GnuTLS certificate credentials object so long as
 
1489
            # no X.509 keys are added to it.  Therefore, we can use it
 
1490
            # here despite using OpenPGP certificates.
 
1491
            
 
1492
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
 
1493
            #                      "+AES-256-CBC", "+SHA1",
 
1494
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
 
1495
            #                      "+DHE-DSS"))
 
1496
            # Use a fallback default, since this MUST be set.
 
1497
            priority = self.server.gnutls_priority
 
1498
            if priority is None:
 
1499
                priority = "NORMAL"
 
1500
            (gnutls.library.functions
 
1501
             .gnutls_priority_set_direct(session._c_object,
 
1502
                                         priority, None))
 
1503
            
 
1504
            # Start communication using the Mandos protocol
 
1505
            # Get protocol number
 
1506
            line = self.request.makefile().readline()
 
1507
            logger.debug("Protocol version: %r", line)
 
1508
            try:
 
1509
                if int(line.strip().split()[0]) > 1:
 
1510
                    raise RuntimeError
 
1511
            except (ValueError, IndexError, RuntimeError) as error:
 
1512
                logger.error("Unknown protocol version: %s", error)
 
1513
                return
 
1514
            
 
1515
            # Start GnuTLS connection
 
1516
            try:
 
1517
                session.handshake()
 
1518
            except gnutls.errors.GNUTLSError as error:
 
1519
                logger.warning("Handshake failed: %s", error)
 
1520
                # Do not run session.bye() here: the session is not
 
1521
                # established.  Just abandon the request.
 
1522
                return
 
1523
            logger.debug("Handshake succeeded")
 
1524
            
 
1525
            approval_required = False
 
1526
            try:
 
1527
                try:
 
1528
                    fpr = self.fingerprint(self.peer_certificate
 
1529
                                           (session))
 
1530
                except (TypeError,
 
1531
                        gnutls.errors.GNUTLSError) as error:
 
1532
                    logger.warning("Bad certificate: %s", error)
 
1533
                    return
 
1534
                logger.debug("Fingerprint: %s", fpr)
 
1535
                
 
1536
                try:
 
1537
                    client = ProxyClient(child_pipe, fpr,
 
1538
                                         self.client_address)
 
1539
                except KeyError:
 
1540
                    return
 
1541
                
 
1542
                if self.server.use_dbus:
 
1543
                    # Emit D-Bus signal
 
1544
                    client.NewRequest(str(self.client_address))
 
1545
                
 
1546
                if client.approval_delay:
 
1547
                    delay = client.approval_delay
 
1548
                    client.approvals_pending += 1
 
1549
                    approval_required = True
 
1550
                
 
1551
                while True:
 
1552
                    if not client.enabled:
 
1553
                        logger.info("Client %s is disabled",
 
1554
                                       client.name)
 
1555
                        if self.server.use_dbus:
 
1556
                            # Emit D-Bus signal
 
1557
                            client.Rejected("Disabled")
 
1558
                        return
 
1559
                    
 
1560
                    if client.approved or not client.approval_delay:
 
1561
                        #We are approved or approval is disabled
 
1562
                        break
 
1563
                    elif client.approved is None:
 
1564
                        logger.info("Client %s needs approval",
 
1565
                                    client.name)
 
1566
                        if self.server.use_dbus:
 
1567
                            # Emit D-Bus signal
 
1568
                            client.NeedApproval(
 
1569
                                client.approval_delay_milliseconds(),
 
1570
                                client.approved_by_default)
 
1571
                    else:
 
1572
                        logger.warning("Client %s was not approved",
 
1573
                                       client.name)
 
1574
                        if self.server.use_dbus:
 
1575
                            # Emit D-Bus signal
 
1576
                            client.Rejected("Denied")
 
1577
                        return
 
1578
                    
 
1579
                    #wait until timeout or approved
 
1580
                    time = datetime.datetime.now()
 
1581
                    client.changedstate.acquire()
 
1582
                    (client.changedstate.wait
 
1583
                     (float(client.timedelta_to_milliseconds(delay)
 
1584
                            / 1000)))
 
1585
                    client.changedstate.release()
 
1586
                    time2 = datetime.datetime.now()
 
1587
                    if (time2 - time) >= delay:
 
1588
                        if not client.approved_by_default:
 
1589
                            logger.warning("Client %s timed out while"
 
1590
                                           " waiting for approval",
 
1591
                                           client.name)
 
1592
                            if self.server.use_dbus:
 
1593
                                # Emit D-Bus signal
 
1594
                                client.Rejected("Approval timed out")
 
1595
                            return
 
1596
                        else:
 
1597
                            break
 
1598
                    else:
 
1599
                        delay -= time2 - time
 
1600
                
 
1601
                sent_size = 0
 
1602
                while sent_size < len(client.secret):
 
1603
                    try:
 
1604
                        sent = session.send(client.secret[sent_size:])
 
1605
                    except gnutls.errors.GNUTLSError as error:
 
1606
                        logger.warning("gnutls send failed")
 
1607
                        return
 
1608
                    logger.debug("Sent: %d, remaining: %d",
 
1609
                                 sent, len(client.secret)
 
1610
                                 - (sent_size + sent))
 
1611
                    sent_size += sent
 
1612
                
 
1613
                logger.info("Sending secret to %s", client.name)
 
1614
                # bump the timeout using extended_timeout
 
1615
                client.checked_ok(client.extended_timeout)
 
1616
                if self.server.use_dbus:
 
1617
                    # Emit D-Bus signal
 
1618
                    client.GotSecret()
 
1619
            
 
1620
            finally:
 
1621
                if approval_required:
 
1622
                    client.approvals_pending -= 1
 
1623
                try:
 
1624
                    session.bye()
 
1625
                except gnutls.errors.GNUTLSError as error:
 
1626
                    logger.warning("GnuTLS bye failed")
 
1627
    
 
1628
    @staticmethod
 
1629
    def peer_certificate(session):
 
1630
        "Return the peer's OpenPGP certificate as a bytestring"
 
1631
        # If not an OpenPGP certificate...
 
1632
        if (gnutls.library.functions
 
1633
            .gnutls_certificate_type_get(session._c_object)
 
1634
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
 
1635
            # ...do the normal thing
 
1636
            return session.peer_certificate
 
1637
        list_size = ctypes.c_uint(1)
 
1638
        cert_list = (gnutls.library.functions
 
1639
                     .gnutls_certificate_get_peers
 
1640
                     (session._c_object, ctypes.byref(list_size)))
 
1641
        if not bool(cert_list) and list_size.value != 0:
 
1642
            raise gnutls.errors.GNUTLSError("error getting peer"
 
1643
                                            " certificate")
 
1644
        if list_size.value == 0:
 
1645
            return None
 
1646
        cert = cert_list[0]
 
1647
        return ctypes.string_at(cert.data, cert.size)
 
1648
    
 
1649
    @staticmethod
 
1650
    def fingerprint(openpgp):
 
1651
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
 
1652
        # New GnuTLS "datum" with the OpenPGP public key
 
1653
        datum = (gnutls.library.types
 
1654
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
 
1655
                                             ctypes.POINTER
 
1656
                                             (ctypes.c_ubyte)),
 
1657
                                 ctypes.c_uint(len(openpgp))))
 
1658
        # New empty GnuTLS certificate
 
1659
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
1660
        (gnutls.library.functions
 
1661
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
 
1662
        # Import the OpenPGP public key into the certificate
 
1663
        (gnutls.library.functions
 
1664
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
 
1665
                                    gnutls.library.constants
 
1666
                                    .GNUTLS_OPENPGP_FMT_RAW))
 
1667
        # Verify the self signature in the key
 
1668
        crtverify = ctypes.c_uint()
 
1669
        (gnutls.library.functions
 
1670
         .gnutls_openpgp_crt_verify_self(crt, 0,
 
1671
                                         ctypes.byref(crtverify)))
 
1672
        if crtverify.value != 0:
 
1673
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1674
            raise (gnutls.errors.CertificateSecurityError
 
1675
                   ("Verify failed"))
 
1676
        # New buffer for the fingerprint
 
1677
        buf = ctypes.create_string_buffer(20)
 
1678
        buf_len = ctypes.c_size_t()
 
1679
        # Get the fingerprint from the certificate into the buffer
 
1680
        (gnutls.library.functions
 
1681
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
 
1682
                                             ctypes.byref(buf_len)))
 
1683
        # Deinit the certificate
 
1684
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
1685
        # Convert the buffer to a Python bytestring
 
1686
        fpr = ctypes.string_at(buf, buf_len.value)
 
1687
        # Convert the bytestring to hexadecimal notation
 
1688
        hex_fpr = binascii.hexlify(fpr).upper()
 
1689
        return hex_fpr
 
1690
 
 
1691
 
 
1692
class MultiprocessingMixIn(object):
 
1693
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
 
1694
    def sub_process_main(self, request, address):
 
1695
        try:
 
1696
            self.finish_request(request, address)
 
1697
        except Exception:
 
1698
            self.handle_error(request, address)
 
1699
        self.close_request(request)
 
1700
    
 
1701
    def process_request(self, request, address):
 
1702
        """Start a new process to process the request."""
 
1703
        proc = multiprocessing.Process(target = self.sub_process_main,
 
1704
                                       args = (request,
 
1705
                                               address))
 
1706
        proc.start()
 
1707
        return proc
 
1708
 
 
1709
 
 
1710
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
 
1711
    """ adds a pipe to the MixIn """
 
1712
    def process_request(self, request, client_address):
 
1713
        """Overrides and wraps the original process_request().
 
1714
        
 
1715
        This function creates a new pipe in self.pipe
 
1716
        """
 
1717
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
 
1718
        
 
1719
        proc = MultiprocessingMixIn.process_request(self, request,
 
1720
                                                    client_address)
 
1721
        self.child_pipe.close()
 
1722
        self.add_pipe(parent_pipe, proc)
 
1723
    
 
1724
    def add_pipe(self, parent_pipe, proc):
 
1725
        """Dummy function; override as necessary"""
 
1726
        raise NotImplementedError
 
1727
 
 
1728
 
 
1729
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
 
1730
                     socketserver.TCPServer, object):
 
1731
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
 
1732
    
518
1733
    Attributes:
519
 
        settings:       Server settings
520
 
        clients:        Set() of Client objects
521
1734
        enabled:        Boolean; whether this server is activated yet
 
1735
        interface:      None or a network interface name (string)
 
1736
        use_ipv6:       Boolean; to use IPv6 or not
522
1737
    """
523
 
    address_family = socket.AF_INET6
524
 
    def __init__(self, *args, **kwargs):
525
 
        if "settings" in kwargs:
526
 
            self.settings = kwargs["settings"]
527
 
            del kwargs["settings"]
528
 
        if "clients" in kwargs:
529
 
            self.clients = kwargs["clients"]
530
 
            del kwargs["clients"]
531
 
        self.enabled = False
532
 
        return super(type(self), self).__init__(*args, **kwargs)
 
1738
    def __init__(self, server_address, RequestHandlerClass,
 
1739
                 interface=None, use_ipv6=True):
 
1740
        self.interface = interface
 
1741
        if use_ipv6:
 
1742
            self.address_family = socket.AF_INET6
 
1743
        socketserver.TCPServer.__init__(self, server_address,
 
1744
                                        RequestHandlerClass)
533
1745
    def server_bind(self):
534
1746
        """This overrides the normal server_bind() function
535
1747
        to bind to an interface if one was specified, and also NOT to
536
1748
        bind to an address or port if they were not specified."""
537
 
        if self.settings["interface"]:
538
 
            # 25 is from /usr/include/asm-i486/socket.h
539
 
            SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
540
 
            try:
541
 
                self.socket.setsockopt(socket.SOL_SOCKET,
542
 
                                       SO_BINDTODEVICE,
543
 
                                       self.settings["interface"])
544
 
            except socket.error, error:
545
 
                if error[0] == errno.EPERM:
546
 
                    logger.error(u"No permission to"
547
 
                                 u" bind to interface %s",
548
 
                                 self.settings["interface"])
549
 
                else:
550
 
                    raise error
 
1749
        if self.interface is not None:
 
1750
            if SO_BINDTODEVICE is None:
 
1751
                logger.error("SO_BINDTODEVICE does not exist;"
 
1752
                             " cannot bind to interface %s",
 
1753
                             self.interface)
 
1754
            else:
 
1755
                try:
 
1756
                    self.socket.setsockopt(socket.SOL_SOCKET,
 
1757
                                           SO_BINDTODEVICE,
 
1758
                                           str(self.interface
 
1759
                                               + '\0'))
 
1760
                except socket.error as error:
 
1761
                    if error[0] == errno.EPERM:
 
1762
                        logger.error("No permission to"
 
1763
                                     " bind to interface %s",
 
1764
                                     self.interface)
 
1765
                    elif error[0] == errno.ENOPROTOOPT:
 
1766
                        logger.error("SO_BINDTODEVICE not available;"
 
1767
                                     " cannot bind to interface %s",
 
1768
                                     self.interface)
 
1769
                    else:
 
1770
                        raise
551
1771
        # Only bind(2) the socket if we really need to.
552
1772
        if self.server_address[0] or self.server_address[1]:
553
1773
            if not self.server_address[0]:
554
 
                in6addr_any = "::"
555
 
                self.server_address = (in6addr_any,
 
1774
                if self.address_family == socket.AF_INET6:
 
1775
                    any_address = "::" # in6addr_any
 
1776
                else:
 
1777
                    any_address = socket.INADDR_ANY
 
1778
                self.server_address = (any_address,
556
1779
                                       self.server_address[1])
557
1780
            elif not self.server_address[1]:
558
1781
                self.server_address = (self.server_address[0],
559
1782
                                       0)
560
 
#                 if self.settings["interface"]:
 
1783
#                 if self.interface:
561
1784
#                     self.server_address = (self.server_address[0],
562
1785
#                                            0, # port
563
1786
#                                            0, # flowinfo
564
1787
#                                            if_nametoindex
565
 
#                                            (self.settings
566
 
#                                             ["interface"]))
567
 
            return super(type(self), self).server_bind()
 
1788
#                                            (self.interface))
 
1789
            return socketserver.TCPServer.server_bind(self)
 
1790
 
 
1791
 
 
1792
class MandosServer(IPv6_TCPServer):
 
1793
    """Mandos server.
 
1794
    
 
1795
    Attributes:
 
1796
        clients:        set of Client objects
 
1797
        gnutls_priority GnuTLS priority string
 
1798
        use_dbus:       Boolean; to emit D-Bus signals or not
 
1799
    
 
1800
    Assumes a gobject.MainLoop event loop.
 
1801
    """
 
1802
    def __init__(self, server_address, RequestHandlerClass,
 
1803
                 interface=None, use_ipv6=True, clients=None,
 
1804
                 gnutls_priority=None, use_dbus=True):
 
1805
        self.enabled = False
 
1806
        self.clients = clients
 
1807
        if self.clients is None:
 
1808
            self.clients = {}
 
1809
        self.use_dbus = use_dbus
 
1810
        self.gnutls_priority = gnutls_priority
 
1811
        IPv6_TCPServer.__init__(self, server_address,
 
1812
                                RequestHandlerClass,
 
1813
                                interface = interface,
 
1814
                                use_ipv6 = use_ipv6)
568
1815
    def server_activate(self):
569
1816
        if self.enabled:
570
 
            return super(type(self), self).server_activate()
 
1817
            return socketserver.TCPServer.server_activate(self)
 
1818
    
571
1819
    def enable(self):
572
1820
        self.enabled = True
 
1821
    
 
1822
    def add_pipe(self, parent_pipe, proc):
 
1823
        # Call "handle_ipc" for both data and EOF events
 
1824
        gobject.io_add_watch(parent_pipe.fileno(),
 
1825
                             gobject.IO_IN | gobject.IO_HUP,
 
1826
                             functools.partial(self.handle_ipc,
 
1827
                                               parent_pipe =
 
1828
                                               parent_pipe,
 
1829
                                               proc = proc))
 
1830
    
 
1831
    def handle_ipc(self, source, condition, parent_pipe=None,
 
1832
                   proc = None, client_object=None):
 
1833
        condition_names = {
 
1834
            gobject.IO_IN: "IN",   # There is data to read.
 
1835
            gobject.IO_OUT: "OUT", # Data can be written (without
 
1836
                                    # blocking).
 
1837
            gobject.IO_PRI: "PRI", # There is urgent data to read.
 
1838
            gobject.IO_ERR: "ERR", # Error condition.
 
1839
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
 
1840
                                    # broken, usually for pipes and
 
1841
                                    # sockets).
 
1842
            }
 
1843
        conditions_string = ' | '.join(name
 
1844
                                       for cond, name in
 
1845
                                       condition_names.iteritems()
 
1846
                                       if cond & condition)
 
1847
        # error, or the other end of multiprocessing.Pipe has closed
 
1848
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
 
1849
            # Wait for other process to exit
 
1850
            proc.join()
 
1851
            return False
 
1852
        
 
1853
        # Read a request from the child
 
1854
        request = parent_pipe.recv()
 
1855
        command = request[0]
 
1856
        
 
1857
        if command == 'init':
 
1858
            fpr = request[1]
 
1859
            address = request[2]
 
1860
            
 
1861
            for c in self.clients.itervalues():
 
1862
                if c.fingerprint == fpr:
 
1863
                    client = c
 
1864
                    break
 
1865
            else:
 
1866
                logger.info("Client not found for fingerprint: %s, ad"
 
1867
                            "dress: %s", fpr, address)
 
1868
                if self.use_dbus:
 
1869
                    # Emit D-Bus signal
 
1870
                    mandos_dbus_service.ClientNotFound(fpr,
 
1871
                                                       address[0])
 
1872
                parent_pipe.send(False)
 
1873
                return False
 
1874
            
 
1875
            gobject.io_add_watch(parent_pipe.fileno(),
 
1876
                                 gobject.IO_IN | gobject.IO_HUP,
 
1877
                                 functools.partial(self.handle_ipc,
 
1878
                                                   parent_pipe =
 
1879
                                                   parent_pipe,
 
1880
                                                   proc = proc,
 
1881
                                                   client_object =
 
1882
                                                   client))
 
1883
            parent_pipe.send(True)
 
1884
            # remove the old hook in favor of the new above hook on
 
1885
            # same fileno
 
1886
            return False
 
1887
        if command == 'funcall':
 
1888
            funcname = request[1]
 
1889
            args = request[2]
 
1890
            kwargs = request[3]
 
1891
            
 
1892
            parent_pipe.send(('data', getattr(client_object,
 
1893
                                              funcname)(*args,
 
1894
                                                         **kwargs)))
 
1895
        
 
1896
        if command == 'getattr':
 
1897
            attrname = request[1]
 
1898
            if callable(client_object.__getattribute__(attrname)):
 
1899
                parent_pipe.send(('function',))
 
1900
            else:
 
1901
                parent_pipe.send(('data', client_object
 
1902
                                  .__getattribute__(attrname)))
 
1903
        
 
1904
        if command == 'setattr':
 
1905
            attrname = request[1]
 
1906
            value = request[2]
 
1907
            setattr(client_object, attrname, value)
 
1908
        
 
1909
        return True
573
1910
 
574
1911
 
575
1912
def string_to_delta(interval):
576
1913
    """Parse a string and return a datetime.timedelta
577
 
 
 
1914
    
578
1915
    >>> string_to_delta('7d')
579
1916
    datetime.timedelta(7)
580
1917
    >>> string_to_delta('60s')
583
1920
    datetime.timedelta(0, 3600)
584
1921
    >>> string_to_delta('24h')
585
1922
    datetime.timedelta(1)
586
 
    >>> string_to_delta(u'1w')
 
1923
    >>> string_to_delta('1w')
587
1924
    datetime.timedelta(7)
588
1925
    >>> string_to_delta('5m 30s')
589
1926
    datetime.timedelta(0, 330)
591
1928
    timevalue = datetime.timedelta(0)
592
1929
    for s in interval.split():
593
1930
        try:
594
 
            suffix=unicode(s[-1])
595
 
            value=int(s[:-1])
596
 
            if suffix == u"d":
 
1931
            suffix = unicode(s[-1])
 
1932
            value = int(s[:-1])
 
1933
            if suffix == "d":
597
1934
                delta = datetime.timedelta(value)
598
 
            elif suffix == u"s":
 
1935
            elif suffix == "s":
599
1936
                delta = datetime.timedelta(0, value)
600
 
            elif suffix == u"m":
 
1937
            elif suffix == "m":
601
1938
                delta = datetime.timedelta(0, 0, 0, 0, value)
602
 
            elif suffix == u"h":
 
1939
            elif suffix == "h":
603
1940
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
604
 
            elif suffix == u"w":
 
1941
            elif suffix == "w":
605
1942
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
606
1943
            else:
607
 
                raise ValueError
608
 
        except (ValueError, IndexError):
609
 
            raise ValueError
 
1944
                raise ValueError("Unknown suffix %r" % suffix)
 
1945
        except (ValueError, IndexError) as e:
 
1946
            raise ValueError(*(e.args))
610
1947
        timevalue += delta
611
1948
    return timevalue
612
1949
 
613
1950
 
614
 
def server_state_changed(state):
615
 
    """Derived from the Avahi example code"""
616
 
    if state == avahi.SERVER_COLLISION:
617
 
        logger.error(u"Zeroconf server name collision")
618
 
        service.remove()
619
 
    elif state == avahi.SERVER_RUNNING:
620
 
        service.add()
621
 
 
622
 
 
623
 
def entry_group_state_changed(state, error):
624
 
    """Derived from the Avahi example code"""
625
 
    logger.debug(u"Avahi state change: %i", state)
626
 
    
627
 
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
628
 
        logger.debug(u"Zeroconf service established.")
629
 
    elif state == avahi.ENTRY_GROUP_COLLISION:
630
 
        logger.warning(u"Zeroconf service name collision.")
631
 
        service.rename()
632
 
    elif state == avahi.ENTRY_GROUP_FAILURE:
633
 
        logger.critical(u"Avahi: Error in group state changed %s",
634
 
                        unicode(error))
635
 
        raise AvahiGroupError("State changed: %s", str(error))
636
 
 
637
 
def if_nametoindex(interface):
638
 
    """Call the C function if_nametoindex(), or equivalent"""
639
 
    global if_nametoindex
640
 
    try:
641
 
        if "ctypes.util" not in sys.modules:
642
 
            import ctypes.util
643
 
        if_nametoindex = ctypes.cdll.LoadLibrary\
644
 
            (ctypes.util.find_library("c")).if_nametoindex
645
 
    except (OSError, AttributeError):
646
 
        if "struct" not in sys.modules:
647
 
            import struct
648
 
        if "fcntl" not in sys.modules:
649
 
            import fcntl
650
 
        def if_nametoindex(interface):
651
 
            "Get an interface index the hard way, i.e. using fcntl()"
652
 
            SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
653
 
            s = socket.socket()
654
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
655
 
                                struct.pack("16s16x", interface))
656
 
            s.close()
657
 
            interface_index = struct.unpack("I", ifreq[16:20])[0]
658
 
            return interface_index
659
 
    return if_nametoindex(interface)
660
 
 
661
 
 
662
1951
def daemon(nochdir = False, noclose = False):
663
1952
    """See daemon(3).  Standard BSD Unix function.
 
1953
    
664
1954
    This should really exist as os.daemon, but it doesn't (yet)."""
665
1955
    if os.fork():
666
1956
        sys.exit()
674
1964
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
675
1965
        if not stat.S_ISCHR(os.fstat(null).st_mode):
676
1966
            raise OSError(errno.ENODEV,
677
 
                          "/dev/null not a character device")
 
1967
                          "%s not a character device"
 
1968
                          % os.path.devnull)
678
1969
        os.dup2(null, sys.stdin.fileno())
679
1970
        os.dup2(null, sys.stdout.fileno())
680
1971
        os.dup2(null, sys.stderr.fileno())
683
1974
 
684
1975
 
685
1976
def main():
686
 
    global main_loop_started
687
 
    main_loop_started = False
688
 
    
689
 
    parser = OptionParser(version = "%%prog %s" % version)
690
 
    parser.add_option("-i", "--interface", type="string",
691
 
                      metavar="IF", help="Bind to interface IF")
692
 
    parser.add_option("-a", "--address", type="string",
693
 
                      help="Address to listen for requests on")
694
 
    parser.add_option("-p", "--port", type="int",
695
 
                      help="Port number to receive requests on")
696
 
    parser.add_option("--check", action="store_true", default=False,
697
 
                      help="Run self-test")
698
 
    parser.add_option("--debug", action="store_true",
699
 
                      help="Debug mode; run in foreground and log to"
700
 
                      " terminal")
701
 
    parser.add_option("--priority", type="string", help="GnuTLS"
702
 
                      " priority string (see GnuTLS documentation)")
703
 
    parser.add_option("--servicename", type="string", metavar="NAME",
704
 
                      help="Zeroconf service name")
705
 
    parser.add_option("--configdir", type="string",
706
 
                      default="/etc/mandos", metavar="DIR",
707
 
                      help="Directory to search for configuration"
708
 
                      " files")
709
 
    (options, args) = parser.parse_args()
 
1977
    
 
1978
    ##################################################################
 
1979
    # Parsing of options, both command line and config file
 
1980
    
 
1981
    parser = argparse.ArgumentParser()
 
1982
    parser.add_argument("-v", "--version", action="version",
 
1983
                        version = "%%(prog)s %s" % version,
 
1984
                        help="show version number and exit")
 
1985
    parser.add_argument("-i", "--interface", metavar="IF",
 
1986
                        help="Bind to interface IF")
 
1987
    parser.add_argument("-a", "--address",
 
1988
                        help="Address to listen for requests on")
 
1989
    parser.add_argument("-p", "--port", type=int,
 
1990
                        help="Port number to receive requests on")
 
1991
    parser.add_argument("--check", action="store_true",
 
1992
                        help="Run self-test")
 
1993
    parser.add_argument("--debug", action="store_true",
 
1994
                        help="Debug mode; run in foreground and log"
 
1995
                        " to terminal")
 
1996
    parser.add_argument("--debuglevel", metavar="LEVEL",
 
1997
                        help="Debug level for stdout output")
 
1998
    parser.add_argument("--priority", help="GnuTLS"
 
1999
                        " priority string (see GnuTLS documentation)")
 
2000
    parser.add_argument("--servicename",
 
2001
                        metavar="NAME", help="Zeroconf service name")
 
2002
    parser.add_argument("--configdir",
 
2003
                        default="/etc/mandos", metavar="DIR",
 
2004
                        help="Directory to search for configuration"
 
2005
                        " files")
 
2006
    parser.add_argument("--no-dbus", action="store_false",
 
2007
                        dest="use_dbus", help="Do not provide D-Bus"
 
2008
                        " system bus interface")
 
2009
    parser.add_argument("--no-ipv6", action="store_false",
 
2010
                        dest="use_ipv6", help="Do not use IPv6")
 
2011
    parser.add_argument("--no-restore", action="store_false",
 
2012
                        dest="restore", help="Do not restore stored"
 
2013
                        " state")
 
2014
    parser.add_argument("--statedir", metavar="DIR",
 
2015
                        help="Directory to save/restore state in")
 
2016
    
 
2017
    options = parser.parse_args()
710
2018
    
711
2019
    if options.check:
712
2020
        import doctest
721
2029
                        "priority":
722
2030
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
723
2031
                        "servicename": "Mandos",
 
2032
                        "use_dbus": "True",
 
2033
                        "use_ipv6": "True",
 
2034
                        "debuglevel": "",
 
2035
                        "restore": "True",
 
2036
                        "statedir": "/var/lib/mandos"
724
2037
                        }
725
2038
    
726
2039
    # Parse config file for server-global settings
727
 
    server_config = ConfigParser.SafeConfigParser(server_defaults)
 
2040
    server_config = configparser.SafeConfigParser(server_defaults)
728
2041
    del server_defaults
729
 
    server_config.read(os.path.join(options.configdir, "mandos.conf"))
 
2042
    server_config.read(os.path.join(options.configdir,
 
2043
                                    "mandos.conf"))
730
2044
    # Convert the SafeConfigParser object to a dict
731
2045
    server_settings = server_config.defaults()
732
 
    # Use getboolean on the boolean config option
733
 
    server_settings["debug"] = server_config.getboolean\
734
 
                               ("DEFAULT", "debug")
 
2046
    # Use the appropriate methods on the non-string config options
 
2047
    for option in ("debug", "use_dbus", "use_ipv6"):
 
2048
        server_settings[option] = server_config.getboolean("DEFAULT",
 
2049
                                                           option)
 
2050
    if server_settings["port"]:
 
2051
        server_settings["port"] = server_config.getint("DEFAULT",
 
2052
                                                       "port")
735
2053
    del server_config
736
2054
    
737
2055
    # Override the settings from the config file with command line
738
2056
    # options, if set.
739
2057
    for option in ("interface", "address", "port", "debug",
740
 
                   "priority", "servicename", "configdir"):
 
2058
                   "priority", "servicename", "configdir",
 
2059
                   "use_dbus", "use_ipv6", "debuglevel", "restore",
 
2060
                   "statedir"):
741
2061
        value = getattr(options, option)
742
2062
        if value is not None:
743
2063
            server_settings[option] = value
744
2064
    del options
 
2065
    # Force all strings to be unicode
 
2066
    for option in server_settings.keys():
 
2067
        if type(server_settings[option]) is str:
 
2068
            server_settings[option] = unicode(server_settings[option])
745
2069
    # Now we have our good server settings in "server_settings"
746
2070
    
 
2071
    ##################################################################
 
2072
    
 
2073
    # For convenience
747
2074
    debug = server_settings["debug"]
 
2075
    debuglevel = server_settings["debuglevel"]
 
2076
    use_dbus = server_settings["use_dbus"]
 
2077
    use_ipv6 = server_settings["use_ipv6"]
 
2078
    stored_state_path = os.path.join(server_settings["statedir"],
 
2079
                                     stored_state_file)
748
2080
    
749
 
    if not debug:
750
 
        syslogger.setLevel(logging.WARNING)
751
 
        console.setLevel(logging.WARNING)
 
2081
    if debug:
 
2082
        initlogger(debug, logging.DEBUG)
 
2083
    else:
 
2084
        if not debuglevel:
 
2085
            initlogger(debug)
 
2086
        else:
 
2087
            level = getattr(logging, debuglevel.upper())
 
2088
            initlogger(debug, level)
752
2089
    
753
2090
    if server_settings["servicename"] != "Mandos":
754
 
        syslogger.setFormatter(logging.Formatter\
755
 
                               ('Mandos (%s): %%(levelname)s:'
756
 
                                ' %%(message)s'
 
2091
        syslogger.setFormatter(logging.Formatter
 
2092
                               ('Mandos (%s) [%%(process)d]:'
 
2093
                                ' %%(levelname)s: %%(message)s'
757
2094
                                % server_settings["servicename"]))
758
2095
    
759
2096
    # Parse config file with clients
760
 
    client_defaults = { "timeout": "1h",
761
 
                        "interval": "5m",
762
 
                        "checker": "fping -q -- %(host)s",
763
 
                        "host": "",
764
 
                        }
765
 
    client_config = ConfigParser.SafeConfigParser(client_defaults)
 
2097
    client_config = configparser.SafeConfigParser(Client.client_defaults)
766
2098
    client_config.read(os.path.join(server_settings["configdir"],
767
2099
                                    "clients.conf"))
768
2100
    
769
 
    clients = Set()
770
 
    tcp_server = IPv6_TCPServer((server_settings["address"],
771
 
                                 server_settings["port"]),
772
 
                                tcp_handler,
773
 
                                settings=server_settings,
774
 
                                clients=clients)
775
 
    pidfilename = "/var/run/mandos.pid"
776
 
    try:
777
 
        pidfile = open(pidfilename, "w")
778
 
    except IOError, error:
779
 
        logger.error("Could not open file %r", pidfilename)
780
 
    
781
 
    uid = 65534
782
 
    gid = 65534
783
 
    try:
784
 
        uid = pwd.getpwnam("mandos").pw_uid
785
 
    except KeyError:
786
 
        try:
787
 
            uid = pwd.getpwnam("nobody").pw_uid
788
 
        except KeyError:
789
 
            pass
790
 
    try:
791
 
        gid = pwd.getpwnam("mandos").pw_gid
792
 
    except KeyError:
793
 
        try:
794
 
            gid = pwd.getpwnam("nogroup").pw_gid
795
 
        except KeyError:
796
 
            pass
797
 
    try:
 
2101
    global mandos_dbus_service
 
2102
    mandos_dbus_service = None
 
2103
    
 
2104
    tcp_server = MandosServer((server_settings["address"],
 
2105
                               server_settings["port"]),
 
2106
                              ClientHandler,
 
2107
                              interface=(server_settings["interface"]
 
2108
                                         or None),
 
2109
                              use_ipv6=use_ipv6,
 
2110
                              gnutls_priority=
 
2111
                              server_settings["priority"],
 
2112
                              use_dbus=use_dbus)
 
2113
    if not debug:
 
2114
        pidfilename = "/var/run/mandos.pid"
 
2115
        try:
 
2116
            pidfile = open(pidfilename, "w")
 
2117
        except IOError:
 
2118
            logger.error("Could not open file %r", pidfilename)
 
2119
    
 
2120
    try:
 
2121
        uid = pwd.getpwnam("_mandos").pw_uid
 
2122
        gid = pwd.getpwnam("_mandos").pw_gid
 
2123
    except KeyError:
 
2124
        try:
 
2125
            uid = pwd.getpwnam("mandos").pw_uid
 
2126
            gid = pwd.getpwnam("mandos").pw_gid
 
2127
        except KeyError:
 
2128
            try:
 
2129
                uid = pwd.getpwnam("nobody").pw_uid
 
2130
                gid = pwd.getpwnam("nobody").pw_gid
 
2131
            except KeyError:
 
2132
                uid = 65534
 
2133
                gid = 65534
 
2134
    try:
 
2135
        os.setgid(gid)
798
2136
        os.setuid(uid)
799
 
        os.setgid(gid)
800
 
    except OSError, error:
 
2137
    except OSError as error:
801
2138
        if error[0] != errno.EPERM:
802
2139
            raise error
803
2140
    
804
 
    global service
805
 
    service = AvahiService(name = server_settings["servicename"],
806
 
                           type = "_mandos._tcp", );
807
 
    if server_settings["interface"]:
808
 
        service.interface = if_nametoindex\
809
 
                            (server_settings["interface"])
 
2141
    if debug:
 
2142
        # Enable all possible GnuTLS debugging
 
2143
        
 
2144
        # "Use a log level over 10 to enable all debugging options."
 
2145
        # - GnuTLS manual
 
2146
        gnutls.library.functions.gnutls_global_set_log_level(11)
 
2147
        
 
2148
        @gnutls.library.types.gnutls_log_func
 
2149
        def debug_gnutls(level, string):
 
2150
            logger.debug("GnuTLS: %s", string[:-1])
 
2151
        
 
2152
        (gnutls.library.functions
 
2153
         .gnutls_global_set_log_function(debug_gnutls))
 
2154
        
 
2155
        # Redirect stdin so all checkers get /dev/null
 
2156
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
 
2157
        os.dup2(null, sys.stdin.fileno())
 
2158
        if null > 2:
 
2159
            os.close(null)
 
2160
    
 
2161
    # Need to fork before connecting to D-Bus
 
2162
    if not debug:
 
2163
        # Close all input and output, do double fork, etc.
 
2164
        daemon()
 
2165
    
 
2166
    gobject.threads_init()
810
2167
    
811
2168
    global main_loop
812
 
    global bus
813
 
    global server
814
2169
    # From the Avahi example code
815
2170
    DBusGMainLoop(set_as_default=True )
816
2171
    main_loop = gobject.MainLoop()
817
2172
    bus = dbus.SystemBus()
818
 
    server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
819
 
                                           avahi.DBUS_PATH_SERVER),
820
 
                            avahi.DBUS_INTERFACE_SERVER)
821
2173
    # End of Avahi example code
822
 
    
823
 
    def remove_from_clients(client):
824
 
        clients.remove(client)
825
 
        if not clients:
826
 
            logger.critical(u"No clients left, exiting")
827
 
            sys.exit()
828
 
    
829
 
    clients.update(Set(Client(name = section,
830
 
                              stop_hook = remove_from_clients,
831
 
                              config
832
 
                              = dict(client_config.items(section)))
833
 
                       for section in client_config.sections()))
834
 
    if not clients:
835
 
        logger.critical(u"No clients defined")
836
 
        sys.exit(1)
837
 
    
838
 
    if debug:
839
 
        # Redirect stdin so all checkers get /dev/null
840
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
841
 
        os.dup2(null, sys.stdin.fileno())
842
 
        if null > 2:
843
 
            os.close(null)
844
 
    else:
845
 
        # No console logging
846
 
        logger.removeHandler(console)
847
 
        # Close all input and output, do double fork, etc.
848
 
        daemon()
849
 
    
850
 
    try:
851
 
        pid = os.getpid()
852
 
        pidfile.write(str(pid) + "\n")
853
 
        pidfile.close()
854
 
        del pidfile
855
 
    except IOError, err:
856
 
        logger.error(u"Could not write to file %r with PID %d",
857
 
                     pidfilename, pid)
858
 
    except NameError:
859
 
        # "pidfile" was never created
860
 
        pass
861
 
    del pidfilename
 
2174
    if use_dbus:
 
2175
        try:
 
2176
            bus_name = dbus.service.BusName("se.recompile.Mandos",
 
2177
                                            bus, do_not_queue=True)
 
2178
            old_bus_name = (dbus.service.BusName
 
2179
                            ("se.bsnet.fukt.Mandos", bus,
 
2180
                             do_not_queue=True))
 
2181
        except dbus.exceptions.NameExistsException as e:
 
2182
            logger.error(unicode(e) + ", disabling D-Bus")
 
2183
            use_dbus = False
 
2184
            server_settings["use_dbus"] = False
 
2185
            tcp_server.use_dbus = False
 
2186
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
 
2187
    service = AvahiServiceToSyslog(name =
 
2188
                                   server_settings["servicename"],
 
2189
                                   servicetype = "_mandos._tcp",
 
2190
                                   protocol = protocol, bus = bus)
 
2191
    if server_settings["interface"]:
 
2192
        service.interface = (if_nametoindex
 
2193
                             (str(server_settings["interface"])))
 
2194
    
 
2195
    global multiprocessing_manager
 
2196
    multiprocessing_manager = multiprocessing.Manager()
 
2197
    
 
2198
    client_class = Client
 
2199
    if use_dbus:
 
2200
        client_class = functools.partial(ClientDBusTransitional,
 
2201
                                         bus = bus)
 
2202
    
 
2203
    client_settings = Client.config_parser(client_config)
 
2204
    old_client_settings = {}
 
2205
    clients_data = {}
 
2206
    
 
2207
    # Get client data and settings from last running state.
 
2208
    if server_settings["restore"]:
 
2209
        try:
 
2210
            with open(stored_state_path, "rb") as stored_state:
 
2211
                clients_data, old_client_settings = (pickle.load
 
2212
                                                     (stored_state))
 
2213
            os.remove(stored_state_path)
 
2214
        except IOError as e:
 
2215
            logger.warning("Could not load persistent state: {0}"
 
2216
                           .format(e))
 
2217
            if e.errno != errno.ENOENT:
 
2218
                raise
 
2219
        except EOFError as e:
 
2220
            logger.warning("Could not load persistent state: "
 
2221
                           "EOFError: {0}".format(e))
 
2222
    
 
2223
    with PGPEngine() as pgp:
 
2224
        for client_name, client in clients_data.iteritems():
 
2225
            # Decide which value to use after restoring saved state.
 
2226
            # We have three different values: Old config file,
 
2227
            # new config file, and saved state.
 
2228
            # New config value takes precedence if it differs from old
 
2229
            # config value, otherwise use saved state.
 
2230
            for name, value in client_settings[client_name].items():
 
2231
                try:
 
2232
                    # For each value in new config, check if it
 
2233
                    # differs from the old config value (Except for
 
2234
                    # the "secret" attribute)
 
2235
                    if (name != "secret" and
 
2236
                        value != old_client_settings[client_name]
 
2237
                        [name]):
 
2238
                        client[name] = value
 
2239
                except KeyError:
 
2240
                    pass
 
2241
            
 
2242
            # Clients who has passed its expire date can still be
 
2243
            # enabled if its last checker was successful.  Clients
 
2244
            # whose checker failed before we stored its state is
 
2245
            # assumed to have failed all checkers during downtime.
 
2246
            if client["enabled"]:
 
2247
                if datetime.datetime.utcnow() >= client["expires"]:
 
2248
                    if not client["last_checked_ok"]:
 
2249
                        logger.warning(
 
2250
                            "disabling client {0} - Client never "
 
2251
                            "performed a successfull checker"
 
2252
                            .format(client["name"]))
 
2253
                        client["enabled"] = False
 
2254
                    elif client["last_checker_status"] != 0:
 
2255
                        logger.warning(
 
2256
                            "disabling client {0} - Client "
 
2257
                            "last checker failed with error code {1}"
 
2258
                            .format(client["name"],
 
2259
                                    client["last_checker_status"]))
 
2260
                        client["enabled"] = False
 
2261
                    else:
 
2262
                        client["expires"] = (datetime.datetime
 
2263
                                             .utcnow()
 
2264
                                             + client["timeout"])
 
2265
                    
 
2266
            try:
 
2267
                client["secret"] = (
 
2268
                    pgp.decrypt(client["encrypted_secret"],
 
2269
                                client_settings[client_name]
 
2270
                                ["secret"]))
 
2271
            except PGPError:
 
2272
                # If decryption fails, we use secret from new settings
 
2273
                logger.debug("Failed to decrypt {0} old secret"
 
2274
                             .format(client_name))
 
2275
                client["secret"] = (
 
2276
                    client_settings[client_name]["secret"])
 
2277
 
 
2278
    
 
2279
    # Add/remove clients based on new changes made to config
 
2280
    for client_name in set(old_client_settings) - set(client_settings):
 
2281
        del clients_data[client_name]
 
2282
    for client_name in set(client_settings) - set(old_client_settings):
 
2283
        clients_data[client_name] = client_settings[client_name]
 
2284
 
 
2285
    # Create clients all clients
 
2286
    for client_name, client in clients_data.iteritems():
 
2287
        tcp_server.clients[client_name] = client_class(
 
2288
            name = client_name, settings = client)
 
2289
    
 
2290
    if not tcp_server.clients:
 
2291
        logger.warning("No clients defined")
 
2292
        
 
2293
    if not debug:
 
2294
        try:
 
2295
            with pidfile:
 
2296
                pid = os.getpid()
 
2297
                pidfile.write(str(pid) + "\n".encode("utf-8"))
 
2298
            del pidfile
 
2299
        except IOError:
 
2300
            logger.error("Could not write to file %r with PID %d",
 
2301
                         pidfilename, pid)
 
2302
        except NameError:
 
2303
            # "pidfile" was never created
 
2304
            pass
 
2305
        del pidfilename
 
2306
        signal.signal(signal.SIGINT, signal.SIG_IGN)
 
2307
    
 
2308
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
 
2309
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
 
2310
    
 
2311
    if use_dbus:
 
2312
        class MandosDBusService(dbus.service.Object):
 
2313
            """A D-Bus proxy object"""
 
2314
            def __init__(self):
 
2315
                dbus.service.Object.__init__(self, bus, "/")
 
2316
            _interface = "se.recompile.Mandos"
 
2317
            
 
2318
            @dbus.service.signal(_interface, signature="o")
 
2319
            def ClientAdded(self, objpath):
 
2320
                "D-Bus signal"
 
2321
                pass
 
2322
            
 
2323
            @dbus.service.signal(_interface, signature="ss")
 
2324
            def ClientNotFound(self, fingerprint, address):
 
2325
                "D-Bus signal"
 
2326
                pass
 
2327
            
 
2328
            @dbus.service.signal(_interface, signature="os")
 
2329
            def ClientRemoved(self, objpath, name):
 
2330
                "D-Bus signal"
 
2331
                pass
 
2332
            
 
2333
            @dbus.service.method(_interface, out_signature="ao")
 
2334
            def GetAllClients(self):
 
2335
                "D-Bus method"
 
2336
                return dbus.Array(c.dbus_object_path
 
2337
                                  for c in
 
2338
                                  tcp_server.clients.itervalues())
 
2339
            
 
2340
            @dbus.service.method(_interface,
 
2341
                                 out_signature="a{oa{sv}}")
 
2342
            def GetAllClientsWithProperties(self):
 
2343
                "D-Bus method"
 
2344
                return dbus.Dictionary(
 
2345
                    ((c.dbus_object_path, c.GetAll(""))
 
2346
                     for c in tcp_server.clients.itervalues()),
 
2347
                    signature="oa{sv}")
 
2348
            
 
2349
            @dbus.service.method(_interface, in_signature="o")
 
2350
            def RemoveClient(self, object_path):
 
2351
                "D-Bus method"
 
2352
                for c in tcp_server.clients.itervalues():
 
2353
                    if c.dbus_object_path == object_path:
 
2354
                        del tcp_server.clients[c.name]
 
2355
                        c.remove_from_connection()
 
2356
                        # Don't signal anything except ClientRemoved
 
2357
                        c.disable(quiet=True)
 
2358
                        # Emit D-Bus signal
 
2359
                        self.ClientRemoved(object_path, c.name)
 
2360
                        return
 
2361
                raise KeyError(object_path)
 
2362
            
 
2363
            del _interface
 
2364
        
 
2365
        class MandosDBusServiceTransitional(MandosDBusService):
 
2366
            __metaclass__ = AlternateDBusNamesMetaclass
 
2367
        mandos_dbus_service = MandosDBusServiceTransitional()
862
2368
    
863
2369
    def cleanup():
864
2370
        "Cleanup function; run on exit"
865
 
        global group
866
 
        # From the Avahi example code
867
 
        if not group is None:
868
 
            group.Free()
869
 
            group = None
870
 
        # End of Avahi example code
871
 
        
872
 
        while clients:
873
 
            client = clients.pop()
874
 
            client.stop_hook = None
875
 
            client.stop()
 
2371
        service.cleanup()
 
2372
        
 
2373
        multiprocessing.active_children()
 
2374
        if not (tcp_server.clients or client_settings):
 
2375
            return
 
2376
        
 
2377
        # Store client before exiting. Secrets are encrypted with key
 
2378
        # based on what config file has. If config file is
 
2379
        # removed/edited, old secret will thus be unrecovable.
 
2380
        clients = {}
 
2381
        with PGPEngine() as pgp:
 
2382
            for client in tcp_server.clients.itervalues():
 
2383
                key = client_settings[client.name]["secret"]
 
2384
                client.encrypted_secret = pgp.encrypt(client.secret,
 
2385
                                                      key)
 
2386
                client_dict = {}
 
2387
                
 
2388
                # A list of attributes that can not be pickled
 
2389
                # + secret.
 
2390
                exclude = set(("bus", "changedstate", "secret",
 
2391
                               "checker"))
 
2392
                for name, typ in (inspect.getmembers
 
2393
                                  (dbus.service.Object)):
 
2394
                    exclude.add(name)
 
2395
                
 
2396
                client_dict["encrypted_secret"] = (client
 
2397
                                                   .encrypted_secret)
 
2398
                for attr in client.client_structure:
 
2399
                    if attr not in exclude:
 
2400
                        client_dict[attr] = getattr(client, attr)
 
2401
                
 
2402
                clients[client.name] = client_dict
 
2403
                del client_settings[client.name]["secret"]
 
2404
        
 
2405
        try:
 
2406
            tempfd, tempname = tempfile.mkstemp(suffix=".pickle",
 
2407
                                                prefix="clients-",
 
2408
                                                dir=os.path.dirname
 
2409
                                                (stored_state_path))
 
2410
            with os.fdopen(tempfd, "wb") as stored_state:
 
2411
                pickle.dump((clients, client_settings), stored_state)
 
2412
            os.rename(tempname, stored_state_path)
 
2413
        except (IOError, OSError) as e:
 
2414
            logger.warning("Could not save persistent state: {0}"
 
2415
                           .format(e))
 
2416
            if not debug:
 
2417
                try:
 
2418
                    os.remove(tempname)
 
2419
                except NameError:
 
2420
                    pass
 
2421
            if e.errno not in set((errno.ENOENT, errno.EACCES,
 
2422
                                   errno.EEXIST)):
 
2423
                raise e
 
2424
        
 
2425
        # Delete all clients, and settings from config
 
2426
        while tcp_server.clients:
 
2427
            name, client = tcp_server.clients.popitem()
 
2428
            if use_dbus:
 
2429
                client.remove_from_connection()
 
2430
            # Don't signal anything except ClientRemoved
 
2431
            client.disable(quiet=True)
 
2432
            if use_dbus:
 
2433
                # Emit D-Bus signal
 
2434
                mandos_dbus_service.ClientRemoved(client
 
2435
                                                  .dbus_object_path,
 
2436
                                                  client.name)
 
2437
        client_settings.clear()
876
2438
    
877
2439
    atexit.register(cleanup)
878
2440
    
879
 
    if not debug:
880
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
881
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
882
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
883
 
    
884
 
    for client in clients:
885
 
        client.start()
 
2441
    for client in tcp_server.clients.itervalues():
 
2442
        if use_dbus:
 
2443
            # Emit D-Bus signal
 
2444
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
 
2445
        # Need to initiate checking of clients
 
2446
        if client.enabled:
 
2447
            client.init_checker()
886
2448
    
887
2449
    tcp_server.enable()
888
2450
    tcp_server.server_activate()
889
2451
    
890
2452
    # Find out what port we got
891
2453
    service.port = tcp_server.socket.getsockname()[1]
892
 
    logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
893
 
                u" scope_id %d" % tcp_server.socket.getsockname())
 
2454
    if use_ipv6:
 
2455
        logger.info("Now listening on address %r, port %d,"
 
2456
                    " flowinfo %d, scope_id %d"
 
2457
                    % tcp_server.socket.getsockname())
 
2458
    else:                       # IPv4
 
2459
        logger.info("Now listening on address %r, port %d"
 
2460
                    % tcp_server.socket.getsockname())
894
2461
    
895
2462
    #service.interface = tcp_server.socket.getsockname()[3]
896
2463
    
897
2464
    try:
898
2465
        # From the Avahi example code
899
 
        server.connect_to_signal("StateChanged", server_state_changed)
900
2466
        try:
901
 
            server_state_changed(server.GetState())
902
 
        except dbus.exceptions.DBusException, error:
903
 
            logger.critical(u"DBusException: %s", error)
 
2467
            service.activate()
 
2468
        except dbus.exceptions.DBusException as error:
 
2469
            logger.critical("DBusException: %s", error)
 
2470
            cleanup()
904
2471
            sys.exit(1)
905
2472
        # End of Avahi example code
906
2473
        
907
2474
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
908
2475
                             lambda *args, **kwargs:
909
 
                             tcp_server.handle_request\
910
 
                             (*args[2:], **kwargs) or True)
 
2476
                             (tcp_server.handle_request
 
2477
                              (*args[2:], **kwargs) or True))
911
2478
        
912
 
        logger.debug(u"Starting main loop")
913
 
        main_loop_started = True
 
2479
        logger.debug("Starting main loop")
914
2480
        main_loop.run()
915
 
    except AvahiError, error:
916
 
        logger.critical(u"AvahiError: %s" + unicode(error))
 
2481
    except AvahiError as error:
 
2482
        logger.critical("AvahiError: %s", error)
 
2483
        cleanup()
917
2484
        sys.exit(1)
918
2485
    except KeyboardInterrupt:
919
2486
        if debug:
920
 
            print
 
2487
            print("", file=sys.stderr)
 
2488
        logger.debug("Server received KeyboardInterrupt")
 
2489
    logger.debug("Server exiting")
 
2490
    # Must run before the D-Bus bus name gets deregistered
 
2491
    cleanup()
921
2492
 
922
2493
if __name__ == '__main__':
923
2494
    main()