/mandos/trunk

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  • Committer: Björn Påhlsson
  • Date: 2008-07-20 02:52:20 UTC
  • Revision ID: belorn@braxen-20080720025220-r5u0388uy9iu23h6
Added following support:
Pluginbased client handler
rewritten Mandos client
       Avahi instead of udp server discovery
       openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server

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1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
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
 
13
 
# Everything else is
14
 
# Copyright © 2008-2012 Teddy Hogeborn
15
 
# Copyright © 2008-2012 Björn Påhlsson
16
 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
31
 
# Contact the authors at <mandos@recompile.se>.
32
 
33
 
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
36
 
 
37
 
import SocketServer as socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
38
6
import socket
39
 
import argparse
 
7
import select
 
8
from optparse import OptionParser
40
9
import datetime
41
10
import errno
42
11
import gnutls.crypto
45
14
import gnutls.library.functions
46
15
import gnutls.library.constants
47
16
import gnutls.library.types
48
 
import ConfigParser as configparser
 
17
import ConfigParser
49
18
import sys
50
19
import re
51
20
import os
52
21
import signal
 
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
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
68
24
 
69
25
import dbus
70
 
import dbus.service
71
26
import gobject
72
27
import avahi
73
28
from dbus.mainloop.glib import DBusGMainLoop
74
29
import ctypes
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 = "1.5.3"
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
 
                                              '--no-use-agent'])
147
 
    
148
 
    def __enter__(self):
149
 
        return self
150
 
    
151
 
    def __exit__ (self, exc_type, exc_value, traceback):
152
 
        self._cleanup()
153
 
        return False
154
 
    
155
 
    def __del__(self):
156
 
        self._cleanup()
157
 
    
158
 
    def _cleanup(self):
159
 
        if self.tempdir is not None:
160
 
            # Delete contents of tempdir
161
 
            for root, dirs, files in os.walk(self.tempdir,
162
 
                                             topdown = False):
163
 
                for filename in files:
164
 
                    os.remove(os.path.join(root, filename))
165
 
                for dirname in dirs:
166
 
                    os.rmdir(os.path.join(root, dirname))
167
 
            # Remove tempdir
168
 
            os.rmdir(self.tempdir)
169
 
            self.tempdir = None
170
 
    
171
 
    def password_encode(self, password):
172
 
        # Passphrase can not be empty and can not contain newlines or
173
 
        # NUL bytes.  So we prefix it and hex encode it.
174
 
        return b"mandos" + binascii.hexlify(password)
175
 
    
176
 
    def encrypt(self, data, password):
177
 
        self.gnupg.passphrase = self.password_encode(password)
178
 
        with open(os.devnull) as devnull:
179
 
            try:
180
 
                proc = self.gnupg.run(['--symmetric'],
181
 
                                      create_fhs=['stdin', 'stdout'],
182
 
                                      attach_fhs={'stderr': devnull})
183
 
                with contextlib.closing(proc.handles['stdin']) as f:
184
 
                    f.write(data)
185
 
                with contextlib.closing(proc.handles['stdout']) as f:
186
 
                    ciphertext = f.read()
187
 
                proc.wait()
188
 
            except IOError as e:
189
 
                raise PGPError(e)
190
 
        self.gnupg.passphrase = None
191
 
        return ciphertext
192
 
    
193
 
    def decrypt(self, data, password):
194
 
        self.gnupg.passphrase = self.password_encode(password)
195
 
        with open(os.devnull) as devnull:
196
 
            try:
197
 
                proc = self.gnupg.run(['--decrypt'],
198
 
                                      create_fhs=['stdin', 'stdout'],
199
 
                                      attach_fhs={'stderr': devnull})
200
 
                with contextlib.closing(proc.handles['stdin'] ) as f:
201
 
                    f.write(data)
202
 
                with contextlib.closing(proc.handles['stdout']) as f:
203
 
                    decrypted_plaintext = f.read()
204
 
                proc.wait()
205
 
            except IOError as e:
206
 
                raise PGPError(e)
207
 
        self.gnupg.passphrase = None
208
 
        return decrypted_plaintext
209
 
 
210
 
 
211
 
 
212
 
class AvahiError(Exception):
213
 
    def __init__(self, value, *args, **kwargs):
214
 
        self.value = value
215
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
216
 
    def __unicode__(self):
217
 
        return unicode(repr(self.value))
218
 
 
219
 
class AvahiServiceError(AvahiError):
220
 
    pass
221
 
 
222
 
class AvahiGroupError(AvahiError):
223
 
    pass
224
 
 
225
 
 
226
 
class AvahiService(object):
227
 
    """An Avahi (Zeroconf) service.
228
 
    
229
 
    Attributes:
230
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
231
 
               Used to optionally bind to the specified interface.
232
 
    name: string; Example: 'Mandos'
233
 
    type: string; Example: '_mandos._tcp'.
234
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
235
 
    port: integer; what port to announce
236
 
    TXT: list of strings; TXT record for the service
237
 
    domain: string; Domain to publish on, default to .local if empty.
238
 
    host: string; Host to publish records for, default is localhost
239
 
    max_renames: integer; maximum number of renames
240
 
    rename_count: integer; counter so we only rename after collisions
241
 
                  a sensible number of times
242
 
    group: D-Bus Entry Group
243
 
    server: D-Bus Server
244
 
    bus: dbus.SystemBus()
245
 
    """
246
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
247
 
                 servicetype = None, port = None, TXT = None,
248
 
                 domain = "", host = "", max_renames = 32768,
249
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
250
 
        self.interface = interface
251
 
        self.name = name
252
 
        self.type = servicetype
253
 
        self.port = port
254
 
        self.TXT = TXT if TXT is not None else []
255
 
        self.domain = domain
256
 
        self.host = host
257
 
        self.rename_count = 0
258
 
        self.max_renames = max_renames
259
 
        self.protocol = protocol
260
 
        self.group = None       # our entry group
261
 
        self.server = None
262
 
        self.bus = bus
263
 
        self.entry_group_state_changed_match = None
264
 
    def rename(self):
265
 
        """Derived from the Avahi example code"""
266
 
        if self.rename_count >= self.max_renames:
267
 
            logger.critical("No suitable Zeroconf service name found"
268
 
                            " after %i retries, exiting.",
269
 
                            self.rename_count)
270
 
            raise AvahiServiceError("Too many renames")
271
 
        self.name = unicode(self.server
272
 
                            .GetAlternativeServiceName(self.name))
273
 
        logger.info("Changing Zeroconf service name to %r ...",
274
 
                    self.name)
275
 
        self.remove()
276
 
        try:
277
 
            self.add()
278
 
        except dbus.exceptions.DBusException as error:
279
 
            logger.critical("DBusException: %s", error)
280
 
            self.cleanup()
281
 
            os._exit(1)
282
 
        self.rename_count += 1
283
 
    def remove(self):
284
 
        """Derived from the Avahi example code"""
285
 
        if self.entry_group_state_changed_match is not None:
286
 
            self.entry_group_state_changed_match.remove()
287
 
            self.entry_group_state_changed_match = None
288
 
        if self.group is not None:
289
 
            self.group.Reset()
290
 
    def add(self):
291
 
        """Derived from the Avahi example code"""
292
 
        self.remove()
293
 
        if self.group is None:
294
 
            self.group = dbus.Interface(
295
 
                self.bus.get_object(avahi.DBUS_NAME,
296
 
                                    self.server.EntryGroupNew()),
297
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
298
 
        self.entry_group_state_changed_match = (
299
 
            self.group.connect_to_signal(
300
 
                'StateChanged', self.entry_group_state_changed))
301
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
302
 
                     self.name, self.type)
303
 
        self.group.AddService(
304
 
            self.interface,
305
 
            self.protocol,
306
 
            dbus.UInt32(0),     # flags
307
 
            self.name, self.type,
308
 
            self.domain, self.host,
309
 
            dbus.UInt16(self.port),
310
 
            avahi.string_array_to_txt_array(self.TXT))
311
 
        self.group.Commit()
312
 
    def entry_group_state_changed(self, state, error):
313
 
        """Derived from the Avahi example code"""
314
 
        logger.debug("Avahi entry group state change: %i", state)
315
 
        
316
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
317
 
            logger.debug("Zeroconf service established.")
318
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
319
 
            logger.info("Zeroconf service name collision.")
320
 
            self.rename()
321
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
322
 
            logger.critical("Avahi: Error in group state changed %s",
323
 
                            unicode(error))
324
 
            raise AvahiGroupError("State changed: %s"
325
 
                                  % unicode(error))
326
 
    def cleanup(self):
327
 
        """Derived from the Avahi example code"""
328
 
        if self.group is not None:
329
 
            try:
330
 
                self.group.Free()
331
 
            except (dbus.exceptions.UnknownMethodException,
332
 
                    dbus.exceptions.DBusException):
333
 
                pass
334
 
            self.group = None
335
 
        self.remove()
336
 
    def server_state_changed(self, state, error=None):
337
 
        """Derived from the Avahi example code"""
338
 
        logger.debug("Avahi server state change: %i", state)
339
 
        bad_states = { avahi.SERVER_INVALID:
340
 
                           "Zeroconf server invalid",
341
 
                       avahi.SERVER_REGISTERING: None,
342
 
                       avahi.SERVER_COLLISION:
343
 
                           "Zeroconf server name collision",
344
 
                       avahi.SERVER_FAILURE:
345
 
                           "Zeroconf server failure" }
346
 
        if state in bad_states:
347
 
            if bad_states[state] is not None:
348
 
                if error is None:
349
 
                    logger.error(bad_states[state])
350
 
                else:
351
 
                    logger.error(bad_states[state] + ": %r", error)
352
 
            self.cleanup()
353
 
        elif state == avahi.SERVER_RUNNING:
354
 
            self.add()
355
 
        else:
356
 
            if error is None:
357
 
                logger.debug("Unknown state: %r", state)
358
 
            else:
359
 
                logger.debug("Unknown state: %r: %r", state, error)
360
 
    def activate(self):
361
 
        """Derived from the Avahi example code"""
362
 
        if self.server is None:
363
 
            self.server = dbus.Interface(
364
 
                self.bus.get_object(avahi.DBUS_NAME,
365
 
                                    avahi.DBUS_PATH_SERVER,
366
 
                                    follow_name_owner_changes=True),
367
 
                avahi.DBUS_INTERFACE_SERVER)
368
 
        self.server.connect_to_signal("StateChanged",
369
 
                                 self.server_state_changed)
370
 
        self.server_state_changed(self.server.GetState())
371
 
 
372
 
class AvahiServiceToSyslog(AvahiService):
373
 
    def rename(self):
374
 
        """Add the new name to the syslog messages"""
375
 
        ret = AvahiService.rename(self)
376
 
        syslogger.setFormatter(logging.Formatter
377
 
                               ('Mandos (%s) [%%(process)d]:'
378
 
                                ' %%(levelname)s: %%(message)s'
379
 
                                % self.name))
380
 
        return ret
381
 
 
382
 
def timedelta_to_milliseconds(td):
383
 
    "Convert a datetime.timedelta() to milliseconds"
384
 
    return ((td.days * 24 * 60 * 60 * 1000)
385
 
            + (td.seconds * 1000)
386
 
            + (td.microseconds // 1000))
387
 
        
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
 
36
logger = logging.Logger('mandos')
 
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
 
38
 
 
39
# This variable is used to optionally bind to a specified interface.
 
40
# It is a global variable to fit in with the other variables from the
 
41
# Avahi server example code.
 
42
serviceInterface = avahi.IF_UNSPEC
 
43
# From the Avahi server example code:
 
44
serviceName = "Mandos"
 
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
46
servicePort = None                      # Not known at startup
 
47
serviceTXT = []                         # TXT record for the service
 
48
domain = ""                  # Domain to publish on, default to .local
 
49
host = ""          # Host to publish records for, default to localhost
 
50
group = None #our entry group
 
51
rename_count = 12       # Counter so we only rename after collisions a
 
52
                        # sensible number of times
 
53
# End of Avahi example code
 
54
 
 
55
 
388
56
class Client(object):
389
57
    """A representation of a client host served by this server.
390
 
    
391
58
    Attributes:
392
 
    approved:   bool(); 'None' if not yet approved/disapproved
393
 
    approval_delay: datetime.timedelta(); Time to wait for approval
394
 
    approval_duration: datetime.timedelta(); Duration of one approval
395
 
    checker:    subprocess.Popen(); a running checker process used
396
 
                                    to see if the client lives.
397
 
                                    'None' if no process is running.
398
 
    checker_callback_tag: a gobject event source tag, or None
399
 
    checker_command: string; External command which is run to check
400
 
                     if client lives.  %() expansions are done at
 
59
    name:      string; from the config file, used in log messages
 
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
61
                 uniquely identify the client
 
62
    secret:    bytestring; sent verbatim (over TLS) to client
 
63
    fqdn:      string (FQDN); available for use by the checker command
 
64
    created:   datetime.datetime()
 
65
    last_seen: datetime.datetime() or None if not yet seen
 
66
    timeout:   datetime.timedelta(); How long from last_seen until
 
67
                                     this client is invalid
 
68
    interval:  datetime.timedelta(); How often to start a new checker
 
69
    stop_hook: If set, called by stop() as stop_hook(self)
 
70
    checker:   subprocess.Popen(); a running checker process used
 
71
                                   to see if the client lives.
 
72
                                   Is None if no process is running.
 
73
    checker_initiator_tag: a gobject event source tag, or None
 
74
    stop_initiator_tag:    - '' -
 
75
    checker_callback_tag:  - '' -
 
76
    checker_command: string; External command which is run to check if
 
77
                     client lives.  %()s expansions are done at
401
78
                     runtime with vars(self) as dict, so that for
402
79
                     instance %(name)s can be used in the command.
403
 
    checker_initiator_tag: a gobject event source tag, or None
404
 
    created:    datetime.datetime(); (UTC) object creation
405
 
    client_structure: Object describing what attributes a client has
406
 
                      and is used for storing the client at exit
407
 
    current_checker_command: string; current running checker_command
408
 
    disable_initiator_tag: a gobject event source tag, or None
409
 
    enabled:    bool()
410
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
411
 
                 uniquely identify the client
412
 
    host:       string; available for use by the checker command
413
 
    interval:   datetime.timedelta(); How often to start a new checker
414
 
    last_approval_request: datetime.datetime(); (UTC) or None
415
 
    last_checked_ok: datetime.datetime(); (UTC) or None
416
 
    last_checker_status: integer between 0 and 255 reflecting exit
417
 
                         status of last checker. -1 reflects crashed
418
 
                         checker, -2 means no checker completed yet.
419
 
    last_enabled: datetime.datetime(); (UTC) or None
420
 
    name:       string; from the config file, used in log messages and
421
 
                        D-Bus identifiers
422
 
    secret:     bytestring; sent verbatim (over TLS) to client
423
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
424
 
                                      until this client is disabled
425
 
    extended_timeout:   extra long timeout when secret has been sent
426
 
    runtime_expansions: Allowed attributes for runtime expansion.
427
 
    expires:    datetime.datetime(); time (UTC) when a client will be
428
 
                disabled, or None
 
80
    Private attibutes:
 
81
    _timeout: Real variable for 'timeout'
 
82
    _interval: Real variable for 'interval'
 
83
    _timeout_milliseconds: Used by gobject.timeout_add()
 
84
    _interval_milliseconds: - '' -
429
85
    """
430
 
    
431
 
    runtime_expansions = ("approval_delay", "approval_duration",
432
 
                          "created", "enabled", "fingerprint",
433
 
                          "host", "interval", "last_checked_ok",
434
 
                          "last_enabled", "name", "timeout")
435
 
    client_defaults = { "timeout": "5m",
436
 
                        "extended_timeout": "15m",
437
 
                        "interval": "2m",
438
 
                        "checker": "fping -q -- %%(host)s",
439
 
                        "host": "",
440
 
                        "approval_delay": "0s",
441
 
                        "approval_duration": "1s",
442
 
                        "approved_by_default": "True",
443
 
                        "enabled": "True",
444
 
                        }
445
 
    
446
 
    def timeout_milliseconds(self):
447
 
        "Return the 'timeout' attribute in milliseconds"
448
 
        return timedelta_to_milliseconds(self.timeout)
449
 
    
450
 
    def extended_timeout_milliseconds(self):
451
 
        "Return the 'extended_timeout' attribute in milliseconds"
452
 
        return timedelta_to_milliseconds(self.extended_timeout)
453
 
    
454
 
    def interval_milliseconds(self):
455
 
        "Return the 'interval' attribute in milliseconds"
456
 
        return timedelta_to_milliseconds(self.interval)
457
 
    
458
 
    def approval_delay_milliseconds(self):
459
 
        return timedelta_to_milliseconds(self.approval_delay)
460
 
 
461
 
    @staticmethod
462
 
    def config_parser(config):
463
 
        """Construct a new dict of client settings of this form:
464
 
        { client_name: {setting_name: value, ...}, ...}
465
 
        with exceptions for any special settings as defined above.
466
 
        NOTE: Must be a pure function. Must return the same result
467
 
        value given the same arguments.
468
 
        """
469
 
        settings = {}
470
 
        for client_name in config.sections():
471
 
            section = dict(config.items(client_name))
472
 
            client = settings[client_name] = {}
473
 
            
474
 
            client["host"] = section["host"]
475
 
            # Reformat values from string types to Python types
476
 
            client["approved_by_default"] = config.getboolean(
477
 
                client_name, "approved_by_default")
478
 
            client["enabled"] = config.getboolean(client_name,
479
 
                                                  "enabled")
480
 
            
481
 
            client["fingerprint"] = (section["fingerprint"].upper()
482
 
                                     .replace(" ", ""))
483
 
            if "secret" in section:
484
 
                client["secret"] = section["secret"].decode("base64")
485
 
            elif "secfile" in section:
486
 
                with open(os.path.expanduser(os.path.expandvars
487
 
                                             (section["secfile"])),
488
 
                          "rb") as secfile:
489
 
                    client["secret"] = secfile.read()
490
 
            else:
491
 
                raise TypeError("No secret or secfile for section %s"
492
 
                                % section)
493
 
            client["timeout"] = string_to_delta(section["timeout"])
494
 
            client["extended_timeout"] = string_to_delta(
495
 
                section["extended_timeout"])
496
 
            client["interval"] = string_to_delta(section["interval"])
497
 
            client["approval_delay"] = string_to_delta(
498
 
                section["approval_delay"])
499
 
            client["approval_duration"] = string_to_delta(
500
 
                section["approval_duration"])
501
 
            client["checker_command"] = section["checker"]
502
 
            client["last_approval_request"] = None
503
 
            client["last_checked_ok"] = None
504
 
            client["last_checker_status"] = -2
505
 
        
506
 
        return settings
507
 
        
508
 
        
509
 
    def __init__(self, settings, name = None):
510
 
        """Note: the 'checker' key in 'config' sets the
511
 
        'checker_command' attribute and *not* the 'checker'
512
 
        attribute."""
 
86
    def _set_timeout(self, timeout):
 
87
        "Setter function for 'timeout' attribute"
 
88
        self._timeout = timeout
 
89
        self._timeout_milliseconds = ((self.timeout.days
 
90
                                       * 24 * 60 * 60 * 1000)
 
91
                                      + (self.timeout.seconds * 1000)
 
92
                                      + (self.timeout.microseconds
 
93
                                         // 1000))
 
94
    timeout = property(lambda self: self._timeout,
 
95
                       _set_timeout)
 
96
    del _set_timeout
 
97
    def _set_interval(self, interval):
 
98
        "Setter function for 'interval' attribute"
 
99
        self._interval = interval
 
100
        self._interval_milliseconds = ((self.interval.days
 
101
                                        * 24 * 60 * 60 * 1000)
 
102
                                       + (self.interval.seconds
 
103
                                          * 1000)
 
104
                                       + (self.interval.microseconds
 
105
                                          // 1000))
 
106
    interval = property(lambda self: self._interval,
 
107
                        _set_interval)
 
108
    del _set_interval
 
109
    def __init__(self, name=None, options=None, stop_hook=None,
 
110
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
111
                 timeout=None, interval=-1, checker=None):
513
112
        self.name = name
514
 
        # adding all client settings
515
 
        for setting, value in settings.iteritems():
516
 
            setattr(self, setting, value)
517
 
        
518
 
        if self.enabled:
519
 
            if not hasattr(self, "last_enabled"):
520
 
                self.last_enabled = datetime.datetime.utcnow()
521
 
            if not hasattr(self, "expires"):
522
 
                self.expires = (datetime.datetime.utcnow()
523
 
                                + self.timeout)
524
 
        else:
525
 
            self.last_enabled = None
526
 
            self.expires = None
527
 
       
528
 
        logger.debug("Creating client %r", self.name)
529
 
        # Uppercase and remove spaces from fingerprint for later
530
 
        # comparison purposes with return value from the fingerprint()
531
 
        # function
532
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
533
 
        self.created = settings.get("created",
534
 
                                    datetime.datetime.utcnow())
535
 
 
536
 
        # attributes specific for this server instance
 
113
        # Uppercase and remove spaces from fingerprint
 
114
        # for later comparison purposes with return value of
 
115
        # the fingerprint() function
 
116
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
117
        if secret:
 
118
            self.secret = secret.decode(u"base64")
 
119
        elif secfile:
 
120
            sf = open(secfile)
 
121
            self.secret = sf.read()
 
122
            sf.close()
 
123
        else:
 
124
            raise RuntimeError(u"No secret or secfile for client %s"
 
125
                               % self.name)
 
126
        self.fqdn = fqdn                # string
 
127
        self.created = datetime.datetime.now()
 
128
        self.last_seen = None
 
129
        if timeout is None:
 
130
            timeout = options.timeout
 
131
        self.timeout = timeout
 
132
        if interval == -1:
 
133
            interval = options.interval
 
134
        else:
 
135
            interval = string_to_delta(interval)
 
136
        self.interval = interval
 
137
        self.stop_hook = stop_hook
537
138
        self.checker = None
538
139
        self.checker_initiator_tag = None
539
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
540
141
        self.checker_callback_tag = None
541
 
        self.current_checker_command = None
542
 
        self.approved = None
543
 
        self.approvals_pending = 0
544
 
        self.changedstate = (multiprocessing_manager
545
 
                             .Condition(multiprocessing_manager
546
 
                                        .Lock()))
547
 
        self.client_structure = [attr for attr in
548
 
                                 self.__dict__.iterkeys()
549
 
                                 if not attr.startswith("_")]
550
 
        self.client_structure.append("client_structure")
551
 
        
552
 
        for name, t in inspect.getmembers(type(self),
553
 
                                          lambda obj:
554
 
                                              isinstance(obj,
555
 
                                                         property)):
556
 
            if not name.startswith("_"):
557
 
                self.client_structure.append(name)
558
 
    
559
 
    # Send notice to process children that client state has changed
560
 
    def send_changedstate(self):
561
 
        with self.changedstate:
562
 
            self.changedstate.notify_all()
563
 
    
564
 
    def enable(self):
565
 
        """Start this client's checker and timeout hooks"""
566
 
        if getattr(self, "enabled", False):
567
 
            # Already enabled
568
 
            return
569
 
        self.send_changedstate()
570
 
        self.expires = datetime.datetime.utcnow() + self.timeout
571
 
        self.enabled = True
572
 
        self.last_enabled = datetime.datetime.utcnow()
573
 
        self.init_checker()
574
 
    
575
 
    def disable(self, quiet=True):
576
 
        """Disable this client."""
577
 
        if not getattr(self, "enabled", False):
578
 
            return False
579
 
        if not quiet:
580
 
            self.send_changedstate()
581
 
        if not quiet:
582
 
            logger.info("Disabling client %s", self.name)
583
 
        if getattr(self, "disable_initiator_tag", False):
584
 
            gobject.source_remove(self.disable_initiator_tag)
585
 
            self.disable_initiator_tag = None
586
 
        self.expires = None
587
 
        if getattr(self, "checker_initiator_tag", False):
588
 
            gobject.source_remove(self.checker_initiator_tag)
589
 
            self.checker_initiator_tag = None
590
 
        self.stop_checker()
591
 
        self.enabled = False
592
 
        # Do not run this again if called by a gobject.timeout_add
593
 
        return False
594
 
    
595
 
    def __del__(self):
596
 
        self.disable()
597
 
    
598
 
    def init_checker(self):
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
599
145
        # Schedule a new checker to be started an 'interval' from now,
600
146
        # and every interval from then on.
601
 
        self.checker_initiator_tag = (gobject.timeout_add
602
 
                                      (self.interval_milliseconds(),
603
 
                                       self.start_checker))
604
 
        # Schedule a disable() when 'timeout' has passed
605
 
        self.disable_initiator_tag = (gobject.timeout_add
606
 
                                   (self.timeout_milliseconds(),
607
 
                                    self.disable))
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
608
150
        # Also start a new checker *right now*.
609
151
        self.start_checker()
610
 
    
611
 
    def checker_callback(self, pid, condition, command):
 
152
        # Schedule a stop() when 'timeout' has passed
 
153
        self.stop_initiator_tag = gobject.timeout_add\
 
154
                                  (self._timeout_milliseconds,
 
155
                                   self.stop)
 
156
    def stop(self):
 
157
        """Stop this client.
 
158
        The possibility that this client might be restarted is left
 
159
        open, but not currently used."""
 
160
        logger.debug(u"Stopping client %s", self.name)
 
161
        self.secret = None
 
162
        if self.stop_initiator_tag:
 
163
            gobject.source_remove(self.stop_initiator_tag)
 
164
            self.stop_initiator_tag = None
 
165
        if self.checker_initiator_tag:
 
166
            gobject.source_remove(self.checker_initiator_tag)
 
167
            self.checker_initiator_tag = None
 
168
        self.stop_checker()
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
 
171
        # Do not run this again if called by a gobject.timeout_add
 
172
        return False
 
173
    def __del__(self):
 
174
        # Some code duplication here and in stop()
 
175
        if hasattr(self, "stop_initiator_tag") \
 
176
               and self.stop_initiator_tag:
 
177
            gobject.source_remove(self.stop_initiator_tag)
 
178
            self.stop_initiator_tag = None
 
179
        if hasattr(self, "checker_initiator_tag") \
 
180
               and self.checker_initiator_tag:
 
181
            gobject.source_remove(self.checker_initiator_tag)
 
182
            self.checker_initiator_tag = None
 
183
        self.stop_checker()
 
184
    def checker_callback(self, pid, condition):
612
185
        """The checker has completed, so take appropriate actions."""
613
 
        self.checker_callback_tag = None
614
 
        self.checker = None
615
 
        if os.WIFEXITED(condition):
616
 
            self.last_checker_status = os.WEXITSTATUS(condition)
617
 
            if self.last_checker_status == 0:
618
 
                logger.info("Checker for %(name)s succeeded",
619
 
                            vars(self))
620
 
                self.checked_ok()
621
 
            else:
622
 
                logger.info("Checker for %(name)s failed",
623
 
                            vars(self))
624
 
        else:
625
 
            self.last_checker_status = -1
626
 
            logger.warning("Checker for %(name)s crashed?",
 
186
        now = datetime.datetime.now()
 
187
        if os.WIFEXITED(condition) \
 
188
               and (os.WEXITSTATUS(condition) == 0):
 
189
            logger.debug(u"Checker for %(name)s succeeded",
 
190
                         vars(self))
 
191
            self.last_seen = now
 
192
            gobject.source_remove(self.stop_initiator_tag)
 
193
            self.stop_initiator_tag = gobject.timeout_add\
 
194
                                      (self._timeout_milliseconds,
 
195
                                       self.stop)
 
196
        if not os.WIFEXITED(condition):
 
197
            logger.warning(u"Checker for %(name)s crashed?",
627
198
                           vars(self))
628
 
    
629
 
    def checked_ok(self):
630
 
        """Assert that the client has been seen, alive and well."""
631
 
        self.last_checked_ok = datetime.datetime.utcnow()
632
 
        self.last_checker_status = 0
633
 
        self.bump_timeout()
634
 
    
635
 
    def bump_timeout(self, timeout=None):
636
 
        """Bump up the timeout for this client."""
637
 
        if timeout is None:
638
 
            timeout = self.timeout
639
 
        if self.disable_initiator_tag is not None:
640
 
            gobject.source_remove(self.disable_initiator_tag)
641
 
        if getattr(self, "enabled", False):
642
 
            self.disable_initiator_tag = (gobject.timeout_add
643
 
                                          (timedelta_to_milliseconds
644
 
                                           (timeout), self.disable))
645
 
            self.expires = datetime.datetime.utcnow() + timeout
646
 
    
647
 
    def need_approval(self):
648
 
        self.last_approval_request = datetime.datetime.utcnow()
649
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
650
204
    def start_checker(self):
651
205
        """Start a new checker subprocess if one is not running.
652
 
        
653
206
        If a checker already exists, leave it running and do
654
207
        nothing."""
655
 
        # The reason for not killing a running checker is that if we
656
 
        # did that, then if a checker (for some reason) started
657
 
        # running slowly and taking more than 'interval' time, the
658
 
        # client would inevitably timeout, since no checker would get
659
 
        # a chance to run to completion.  If we instead leave running
660
 
        # checkers alone, the checker would have to take more time
661
 
        # than 'timeout' for the client to be disabled, which is as it
662
 
        # should be.
663
 
        
664
 
        # If a checker exists, make sure it is not a zombie
665
 
        try:
666
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
667
 
        except (AttributeError, OSError) as error:
668
 
            if (isinstance(error, OSError)
669
 
                and error.errno != errno.ECHILD):
670
 
                raise error
671
 
        else:
672
 
            if pid:
673
 
                logger.warning("Checker was a zombie")
674
 
                gobject.source_remove(self.checker_callback_tag)
675
 
                self.checker_callback(pid, status,
676
 
                                      self.current_checker_command)
677
 
        # Start a new checker if needed
678
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
679
211
            try:
680
 
                # In case checker_command has exactly one % operator
681
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
682
213
            except TypeError:
683
 
                # Escape attributes for the shell
684
 
                escaped_attrs = dict(
685
 
                    (attr,
686
 
                     re.escape(unicode(str(getattr(self, attr, "")),
687
 
                                       errors=
688
 
                                       'replace')))
689
 
                    for attr in
690
 
                    self.runtime_expansions)
691
 
                
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
692
217
                try:
693
 
                    command = self.checker_command % escaped_attrs
694
 
                except TypeError as error:
695
 
                    logger.error('Could not format string "%s":'
696
 
                                 ' %s', self.checker_command, error)
 
218
                    command = self.check_command % escaped_attrs
 
219
                except TypeError, error:
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
697
222
                    return True # Try again later
698
 
            self.current_checker_command = command
699
223
            try:
700
 
                logger.info("Starting checker %r for %s",
701
 
                            command, self.name)
702
 
                # We don't need to redirect stdout and stderr, since
703
 
                # in normal mode, that is already done by daemon(),
704
 
                # and in debug mode we don't want to.  (Stdin is
705
 
                # always replaced by /dev/null.)
706
 
                self.checker = subprocess.Popen(command,
707
 
                                                close_fds=True,
708
 
                                                shell=True, cwd="/")
709
 
                self.checker_callback_tag = (gobject.child_watch_add
710
 
                                             (self.checker.pid,
711
 
                                              self.checker_callback,
712
 
                                              data=command))
713
 
                # The checker may have completed before the gobject
714
 
                # watch was added.  Check for this.
715
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
716
 
                if pid:
717
 
                    gobject.source_remove(self.checker_callback_tag)
718
 
                    self.checker_callback(pid, status, command)
719
 
            except OSError as error:
720
 
                logger.error("Failed to start subprocess: %s",
 
224
                self.checker = subprocess.\
 
225
                               Popen(command,
 
226
                                     stdout=subprocess.PIPE,
 
227
                                     close_fds=True, shell=True,
 
228
                                     cwd="/")
 
229
                self.checker_callback_tag = gobject.\
 
230
                                            child_watch_add(self.checker.pid,
 
231
                                                            self.\
 
232
                                                            checker_callback)
 
233
            except subprocess.OSError, error:
 
234
                logger.error(u"Failed to start subprocess: %s",
721
235
                             error)
722
236
        # Re-run this periodically if run by gobject.timeout_add
723
237
        return True
724
 
    
725
238
    def stop_checker(self):
726
239
        """Force the checker process, if any, to stop."""
727
 
        if self.checker_callback_tag:
728
 
            gobject.source_remove(self.checker_callback_tag)
729
 
            self.checker_callback_tag = None
730
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
731
241
            return
732
 
        logger.debug("Stopping checker for %(name)s", vars(self))
733
 
        try:
734
 
            os.kill(self.checker.pid, signal.SIGTERM)
735
 
            #time.sleep(0.5)
736
 
            #if self.checker.poll() is None:
737
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
738
 
        except OSError as error:
739
 
            if error.errno != errno.ESRCH: # No such process
740
 
                raise
741
 
        self.checker = None
742
 
 
743
 
 
744
 
def dbus_service_property(dbus_interface, signature="v",
745
 
                          access="readwrite", byte_arrays=False):
746
 
    """Decorators for marking methods of a DBusObjectWithProperties to
747
 
    become properties on the D-Bus.
748
 
    
749
 
    The decorated method will be called with no arguments by "Get"
750
 
    and with one argument by "Set".
751
 
    
752
 
    The parameters, where they are supported, are the same as
753
 
    dbus.service.method, except there is only "signature", since the
754
 
    type from Get() and the type sent to Set() is the same.
755
 
    """
756
 
    # Encoding deeply encoded byte arrays is not supported yet by the
757
 
    # "Set" method, so we fail early here:
758
 
    if byte_arrays and signature != "ay":
759
 
        raise ValueError("Byte arrays not supported for non-'ay'"
760
 
                         " signature %r" % signature)
761
 
    def decorator(func):
762
 
        func._dbus_is_property = True
763
 
        func._dbus_interface = dbus_interface
764
 
        func._dbus_signature = signature
765
 
        func._dbus_access = access
766
 
        func._dbus_name = func.__name__
767
 
        if func._dbus_name.endswith("_dbus_property"):
768
 
            func._dbus_name = func._dbus_name[:-14]
769
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
770
 
        return func
771
 
    return decorator
772
 
 
773
 
 
774
 
class DBusPropertyException(dbus.exceptions.DBusException):
775
 
    """A base class for D-Bus property-related exceptions
776
 
    """
777
 
    def __unicode__(self):
778
 
        return unicode(str(self))
779
 
 
780
 
 
781
 
class DBusPropertyAccessException(DBusPropertyException):
782
 
    """A property's access permissions disallows an operation.
783
 
    """
784
 
    pass
785
 
 
786
 
 
787
 
class DBusPropertyNotFound(DBusPropertyException):
788
 
    """An attempt was made to access a non-existing property.
789
 
    """
790
 
    pass
791
 
 
792
 
 
793
 
class DBusObjectWithProperties(dbus.service.Object):
794
 
    """A D-Bus object with properties.
795
 
    
796
 
    Classes inheriting from this can use the dbus_service_property
797
 
    decorator to expose methods as D-Bus properties.  It exposes the
798
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
799
 
    """
800
 
    
801
 
    @staticmethod
802
 
    def _is_dbus_property(obj):
803
 
        return getattr(obj, "_dbus_is_property", False)
804
 
    
805
 
    def _get_all_dbus_properties(self):
806
 
        """Returns a generator of (name, attribute) pairs
807
 
        """
808
 
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
809
 
                for cls in self.__class__.__mro__
810
 
                for name, prop in
811
 
                inspect.getmembers(cls, self._is_dbus_property))
812
 
    
813
 
    def _get_dbus_property(self, interface_name, property_name):
814
 
        """Returns a bound method if one exists which is a D-Bus
815
 
        property with the specified name and interface.
816
 
        """
817
 
        for cls in  self.__class__.__mro__:
818
 
            for name, value in (inspect.getmembers
819
 
                                (cls, self._is_dbus_property)):
820
 
                if (value._dbus_name == property_name
821
 
                    and value._dbus_interface == interface_name):
822
 
                    return value.__get__(self)
823
 
        
824
 
        # No such property
825
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
826
 
                                   + interface_name + "."
827
 
                                   + property_name)
828
 
    
829
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
830
 
                         out_signature="v")
831
 
    def Get(self, interface_name, property_name):
832
 
        """Standard D-Bus property Get() method, see D-Bus standard.
833
 
        """
834
 
        prop = self._get_dbus_property(interface_name, property_name)
835
 
        if prop._dbus_access == "write":
836
 
            raise DBusPropertyAccessException(property_name)
837
 
        value = prop()
838
 
        if not hasattr(value, "variant_level"):
839
 
            return value
840
 
        return type(value)(value, variant_level=value.variant_level+1)
841
 
    
842
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
843
 
    def Set(self, interface_name, property_name, value):
844
 
        """Standard D-Bus property Set() method, see D-Bus standard.
845
 
        """
846
 
        prop = self._get_dbus_property(interface_name, property_name)
847
 
        if prop._dbus_access == "read":
848
 
            raise DBusPropertyAccessException(property_name)
849
 
        if prop._dbus_get_args_options["byte_arrays"]:
850
 
            # The byte_arrays option is not supported yet on
851
 
            # signatures other than "ay".
852
 
            if prop._dbus_signature != "ay":
853
 
                raise ValueError
854
 
            value = dbus.ByteArray(b''.join(chr(byte)
855
 
                                            for byte in value))
856
 
        prop(value)
857
 
    
858
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
859
 
                         out_signature="a{sv}")
860
 
    def GetAll(self, interface_name):
861
 
        """Standard D-Bus property GetAll() method, see D-Bus
862
 
        standard.
863
 
        
864
 
        Note: Will not include properties with access="write".
865
 
        """
866
 
        properties = {}
867
 
        for name, prop in self._get_all_dbus_properties():
868
 
            if (interface_name
869
 
                and interface_name != prop._dbus_interface):
870
 
                # Interface non-empty but did not match
871
 
                continue
872
 
            # Ignore write-only properties
873
 
            if prop._dbus_access == "write":
874
 
                continue
875
 
            value = prop()
876
 
            if not hasattr(value, "variant_level"):
877
 
                properties[name] = value
878
 
                continue
879
 
            properties[name] = type(value)(value, variant_level=
880
 
                                           value.variant_level+1)
881
 
        return dbus.Dictionary(properties, signature="sv")
882
 
    
883
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
884
 
                         out_signature="s",
885
 
                         path_keyword='object_path',
886
 
                         connection_keyword='connection')
887
 
    def Introspect(self, object_path, connection):
888
 
        """Standard D-Bus method, overloaded to insert property tags.
889
 
        """
890
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
891
 
                                                   connection)
892
 
        try:
893
 
            document = xml.dom.minidom.parseString(xmlstring)
894
 
            def make_tag(document, name, prop):
895
 
                e = document.createElement("property")
896
 
                e.setAttribute("name", name)
897
 
                e.setAttribute("type", prop._dbus_signature)
898
 
                e.setAttribute("access", prop._dbus_access)
899
 
                return e
900
 
            for if_tag in document.getElementsByTagName("interface"):
901
 
                for tag in (make_tag(document, name, prop)
902
 
                            for name, prop
903
 
                            in self._get_all_dbus_properties()
904
 
                            if prop._dbus_interface
905
 
                            == if_tag.getAttribute("name")):
906
 
                    if_tag.appendChild(tag)
907
 
                # Add the names to the return values for the
908
 
                # "org.freedesktop.DBus.Properties" methods
909
 
                if (if_tag.getAttribute("name")
910
 
                    == "org.freedesktop.DBus.Properties"):
911
 
                    for cn in if_tag.getElementsByTagName("method"):
912
 
                        if cn.getAttribute("name") == "Get":
913
 
                            for arg in cn.getElementsByTagName("arg"):
914
 
                                if (arg.getAttribute("direction")
915
 
                                    == "out"):
916
 
                                    arg.setAttribute("name", "value")
917
 
                        elif cn.getAttribute("name") == "GetAll":
918
 
                            for arg in cn.getElementsByTagName("arg"):
919
 
                                if (arg.getAttribute("direction")
920
 
                                    == "out"):
921
 
                                    arg.setAttribute("name", "props")
922
 
            xmlstring = document.toxml("utf-8")
923
 
            document.unlink()
924
 
        except (AttributeError, xml.dom.DOMException,
925
 
                xml.parsers.expat.ExpatError) as error:
926
 
            logger.error("Failed to override Introspection method",
927
 
                         error)
928
 
        return xmlstring
929
 
 
930
 
 
931
 
def datetime_to_dbus (dt, variant_level=0):
932
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
933
 
    if dt is None:
934
 
        return dbus.String("", variant_level = variant_level)
935
 
    return dbus.String(dt.isoformat(),
936
 
                       variant_level=variant_level)
937
 
 
938
 
 
939
 
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
940
 
                                  .__metaclass__):
941
 
    """Applied to an empty subclass of a D-Bus object, this metaclass
942
 
    will add additional D-Bus attributes matching a certain pattern.
943
 
    """
944
 
    def __new__(mcs, name, bases, attr):
945
 
        # Go through all the base classes which could have D-Bus
946
 
        # methods, signals, or properties in them
947
 
        for base in (b for b in bases
948
 
                     if issubclass(b, dbus.service.Object)):
949
 
            # Go though all attributes of the base class
950
 
            for attrname, attribute in inspect.getmembers(base):
951
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
952
 
                # with the wrong interface name
953
 
                if (not hasattr(attribute, "_dbus_interface")
954
 
                    or not attribute._dbus_interface
955
 
                    .startswith("se.recompile.Mandos")):
956
 
                    continue
957
 
                # Create an alternate D-Bus interface name based on
958
 
                # the current name
959
 
                alt_interface = (attribute._dbus_interface
960
 
                                 .replace("se.recompile.Mandos",
961
 
                                          "se.bsnet.fukt.Mandos"))
962
 
                # Is this a D-Bus signal?
963
 
                if getattr(attribute, "_dbus_is_signal", False):
964
 
                    # Extract the original non-method function by
965
 
                    # black magic
966
 
                    nonmethod_func = (dict(
967
 
                            zip(attribute.func_code.co_freevars,
968
 
                                attribute.__closure__))["func"]
969
 
                                      .cell_contents)
970
 
                    # Create a new, but exactly alike, function
971
 
                    # object, and decorate it to be a new D-Bus signal
972
 
                    # with the alternate D-Bus interface name
973
 
                    new_function = (dbus.service.signal
974
 
                                    (alt_interface,
975
 
                                     attribute._dbus_signature)
976
 
                                    (types.FunctionType(
977
 
                                nonmethod_func.func_code,
978
 
                                nonmethod_func.func_globals,
979
 
                                nonmethod_func.func_name,
980
 
                                nonmethod_func.func_defaults,
981
 
                                nonmethod_func.func_closure)))
982
 
                    # Define a creator of a function to call both the
983
 
                    # old and new functions, so both the old and new
984
 
                    # signals gets sent when the function is called
985
 
                    def fixscope(func1, func2):
986
 
                        """This function is a scope container to pass
987
 
                        func1 and func2 to the "call_both" function
988
 
                        outside of its arguments"""
989
 
                        def call_both(*args, **kwargs):
990
 
                            """This function will emit two D-Bus
991
 
                            signals by calling func1 and func2"""
992
 
                            func1(*args, **kwargs)
993
 
                            func2(*args, **kwargs)
994
 
                        return call_both
995
 
                    # Create the "call_both" function and add it to
996
 
                    # the class
997
 
                    attr[attrname] = fixscope(attribute,
998
 
                                              new_function)
999
 
                # Is this a D-Bus method?
1000
 
                elif getattr(attribute, "_dbus_is_method", False):
1001
 
                    # Create a new, but exactly alike, function
1002
 
                    # object.  Decorate it to be a new D-Bus method
1003
 
                    # with the alternate D-Bus interface name.  Add it
1004
 
                    # to the class.
1005
 
                    attr[attrname] = (dbus.service.method
1006
 
                                      (alt_interface,
1007
 
                                       attribute._dbus_in_signature,
1008
 
                                       attribute._dbus_out_signature)
1009
 
                                      (types.FunctionType
1010
 
                                       (attribute.func_code,
1011
 
                                        attribute.func_globals,
1012
 
                                        attribute.func_name,
1013
 
                                        attribute.func_defaults,
1014
 
                                        attribute.func_closure)))
1015
 
                # Is this a D-Bus property?
1016
 
                elif getattr(attribute, "_dbus_is_property", False):
1017
 
                    # Create a new, but exactly alike, function
1018
 
                    # object, and decorate it to be a new D-Bus
1019
 
                    # property with the alternate D-Bus interface
1020
 
                    # name.  Add it to the class.
1021
 
                    attr[attrname] = (dbus_service_property
1022
 
                                      (alt_interface,
1023
 
                                       attribute._dbus_signature,
1024
 
                                       attribute._dbus_access,
1025
 
                                       attribute
1026
 
                                       ._dbus_get_args_options
1027
 
                                       ["byte_arrays"])
1028
 
                                      (types.FunctionType
1029
 
                                       (attribute.func_code,
1030
 
                                        attribute.func_globals,
1031
 
                                        attribute.func_name,
1032
 
                                        attribute.func_defaults,
1033
 
                                        attribute.func_closure)))
1034
 
        return type.__new__(mcs, name, bases, attr)
1035
 
 
1036
 
 
1037
 
class ClientDBus(Client, DBusObjectWithProperties):
1038
 
    """A Client class using D-Bus
1039
 
    
1040
 
    Attributes:
1041
 
    dbus_object_path: dbus.ObjectPath
1042
 
    bus: dbus.SystemBus()
1043
 
    """
1044
 
    
1045
 
    runtime_expansions = (Client.runtime_expansions
1046
 
                          + ("dbus_object_path",))
1047
 
    
1048
 
    # dbus.service.Object doesn't use super(), so we can't either.
1049
 
    
1050
 
    def __init__(self, bus = None, *args, **kwargs):
1051
 
        self.bus = bus
1052
 
        Client.__init__(self, *args, **kwargs)
1053
 
        # Only now, when this client is initialized, can it show up on
1054
 
        # the D-Bus
1055
 
        client_object_name = unicode(self.name).translate(
1056
 
            {ord("."): ord("_"),
1057
 
             ord("-"): ord("_")})
1058
 
        self.dbus_object_path = (dbus.ObjectPath
1059
 
                                 ("/clients/" + client_object_name))
1060
 
        DBusObjectWithProperties.__init__(self, self.bus,
1061
 
                                          self.dbus_object_path)
1062
 
        
1063
 
    def notifychangeproperty(transform_func,
1064
 
                             dbus_name, type_func=lambda x: x,
1065
 
                             variant_level=1):
1066
 
        """ Modify a variable so that it's a property which announces
1067
 
        its changes to DBus.
1068
 
        
1069
 
        transform_fun: Function that takes a value and a variant_level
1070
 
                       and transforms it to a D-Bus type.
1071
 
        dbus_name: D-Bus name of the variable
1072
 
        type_func: Function that transform the value before sending it
1073
 
                   to the D-Bus.  Default: no transform
1074
 
        variant_level: D-Bus variant level.  Default: 1
1075
 
        """
1076
 
        attrname = "_{0}".format(dbus_name)
1077
 
        def setter(self, value):
1078
 
            if hasattr(self, "dbus_object_path"):
1079
 
                if (not hasattr(self, attrname) or
1080
 
                    type_func(getattr(self, attrname, None))
1081
 
                    != type_func(value)):
1082
 
                    dbus_value = transform_func(type_func(value),
1083
 
                                                variant_level
1084
 
                                                =variant_level)
1085
 
                    self.PropertyChanged(dbus.String(dbus_name),
1086
 
                                         dbus_value)
1087
 
            setattr(self, attrname, value)
1088
 
        
1089
 
        return property(lambda self: getattr(self, attrname), setter)
1090
 
    
1091
 
    
1092
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1093
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1094
 
                                             "ApprovalPending",
1095
 
                                             type_func = bool)
1096
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1097
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1098
 
                                        "LastEnabled")
1099
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1100
 
                                   type_func = lambda checker:
1101
 
                                       checker is not None)
1102
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1103
 
                                           "LastCheckedOK")
1104
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1105
 
                                               "LastCheckerStatus")
1106
 
    last_approval_request = notifychangeproperty(
1107
 
        datetime_to_dbus, "LastApprovalRequest")
1108
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1109
 
                                               "ApprovedByDefault")
1110
 
    approval_delay = notifychangeproperty(dbus.UInt64,
1111
 
                                          "ApprovalDelay",
1112
 
                                          type_func =
1113
 
                                          timedelta_to_milliseconds)
1114
 
    approval_duration = notifychangeproperty(
1115
 
        dbus.UInt64, "ApprovalDuration",
1116
 
        type_func = timedelta_to_milliseconds)
1117
 
    host = notifychangeproperty(dbus.String, "Host")
1118
 
    timeout = notifychangeproperty(dbus.UInt64, "Timeout",
1119
 
                                   type_func =
1120
 
                                   timedelta_to_milliseconds)
1121
 
    extended_timeout = notifychangeproperty(
1122
 
        dbus.UInt64, "ExtendedTimeout",
1123
 
        type_func = timedelta_to_milliseconds)
1124
 
    interval = notifychangeproperty(dbus.UInt64,
1125
 
                                    "Interval",
1126
 
                                    type_func =
1127
 
                                    timedelta_to_milliseconds)
1128
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1129
 
    
1130
 
    del notifychangeproperty
1131
 
    
1132
 
    def __del__(self, *args, **kwargs):
1133
 
        try:
1134
 
            self.remove_from_connection()
1135
 
        except LookupError:
1136
 
            pass
1137
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1138
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1139
 
        Client.__del__(self, *args, **kwargs)
1140
 
    
1141
 
    def checker_callback(self, pid, condition, command,
1142
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
1143
243
        self.checker_callback_tag = None
 
244
        os.kill(self.checker.pid, signal.SIGTERM)
 
245
        if self.checker.poll() is None:
 
246
            os.kill(self.checker.pid, signal.SIGKILL)
1144
247
        self.checker = None
1145
 
        if os.WIFEXITED(condition):
1146
 
            exitstatus = os.WEXITSTATUS(condition)
1147
 
            # Emit D-Bus signal
1148
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1149
 
                                  dbus.Int64(condition),
1150
 
                                  dbus.String(command))
1151
 
        else:
1152
 
            # Emit D-Bus signal
1153
 
            self.CheckerCompleted(dbus.Int16(-1),
1154
 
                                  dbus.Int64(condition),
1155
 
                                  dbus.String(command))
1156
 
        
1157
 
        return Client.checker_callback(self, pid, condition, command,
1158
 
                                       *args, **kwargs)
1159
 
    
1160
 
    def start_checker(self, *args, **kwargs):
1161
 
        old_checker = self.checker
1162
 
        if self.checker is not None:
1163
 
            old_checker_pid = self.checker.pid
1164
 
        else:
1165
 
            old_checker_pid = None
1166
 
        r = Client.start_checker(self, *args, **kwargs)
1167
 
        # Only if new checker process was started
1168
 
        if (self.checker is not None
1169
 
            and old_checker_pid != self.checker.pid):
1170
 
            # Emit D-Bus signal
1171
 
            self.CheckerStarted(self.current_checker_command)
1172
 
        return r
1173
 
    
1174
 
    def _reset_approved(self):
1175
 
        self.approved = None
1176
 
        return False
1177
 
    
1178
 
    def approve(self, value=True):
1179
 
        self.send_changedstate()
1180
 
        self.approved = value
1181
 
        gobject.timeout_add(timedelta_to_milliseconds
1182
 
                            (self.approval_duration),
1183
 
                            self._reset_approved)
1184
 
    
1185
 
    
1186
 
    ## D-Bus methods, signals & properties
1187
 
    _interface = "se.recompile.Mandos.Client"
1188
 
    
1189
 
    ## Signals
1190
 
    
1191
 
    # CheckerCompleted - signal
1192
 
    @dbus.service.signal(_interface, signature="nxs")
1193
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1194
 
        "D-Bus signal"
1195
 
        pass
1196
 
    
1197
 
    # CheckerStarted - signal
1198
 
    @dbus.service.signal(_interface, signature="s")
1199
 
    def CheckerStarted(self, command):
1200
 
        "D-Bus signal"
1201
 
        pass
1202
 
    
1203
 
    # PropertyChanged - signal
1204
 
    @dbus.service.signal(_interface, signature="sv")
1205
 
    def PropertyChanged(self, property, value):
1206
 
        "D-Bus signal"
1207
 
        pass
1208
 
    
1209
 
    # GotSecret - signal
1210
 
    @dbus.service.signal(_interface)
1211
 
    def GotSecret(self):
1212
 
        """D-Bus signal
1213
 
        Is sent after a successful transfer of secret from the Mandos
1214
 
        server to mandos-client
1215
 
        """
1216
 
        pass
1217
 
    
1218
 
    # Rejected - signal
1219
 
    @dbus.service.signal(_interface, signature="s")
1220
 
    def Rejected(self, reason):
1221
 
        "D-Bus signal"
1222
 
        pass
1223
 
    
1224
 
    # NeedApproval - signal
1225
 
    @dbus.service.signal(_interface, signature="tb")
1226
 
    def NeedApproval(self, timeout, default):
1227
 
        "D-Bus signal"
1228
 
        return self.need_approval()
1229
 
    
1230
 
    ## Methods
1231
 
    
1232
 
    # Approve - method
1233
 
    @dbus.service.method(_interface, in_signature="b")
1234
 
    def Approve(self, value):
1235
 
        self.approve(value)
1236
 
    
1237
 
    # CheckedOK - method
1238
 
    @dbus.service.method(_interface)
1239
 
    def CheckedOK(self):
1240
 
        self.checked_ok()
1241
 
    
1242
 
    # Enable - method
1243
 
    @dbus.service.method(_interface)
1244
 
    def Enable(self):
1245
 
        "D-Bus method"
1246
 
        self.enable()
1247
 
    
1248
 
    # StartChecker - method
1249
 
    @dbus.service.method(_interface)
1250
 
    def StartChecker(self):
1251
 
        "D-Bus method"
1252
 
        self.start_checker()
1253
 
    
1254
 
    # Disable - method
1255
 
    @dbus.service.method(_interface)
1256
 
    def Disable(self):
1257
 
        "D-Bus method"
1258
 
        self.disable()
1259
 
    
1260
 
    # StopChecker - method
1261
 
    @dbus.service.method(_interface)
1262
 
    def StopChecker(self):
1263
 
        self.stop_checker()
1264
 
    
1265
 
    ## Properties
1266
 
    
1267
 
    # ApprovalPending - property
1268
 
    @dbus_service_property(_interface, signature="b", access="read")
1269
 
    def ApprovalPending_dbus_property(self):
1270
 
        return dbus.Boolean(bool(self.approvals_pending))
1271
 
    
1272
 
    # ApprovedByDefault - property
1273
 
    @dbus_service_property(_interface, signature="b",
1274
 
                           access="readwrite")
1275
 
    def ApprovedByDefault_dbus_property(self, value=None):
1276
 
        if value is None:       # get
1277
 
            return dbus.Boolean(self.approved_by_default)
1278
 
        self.approved_by_default = bool(value)
1279
 
    
1280
 
    # ApprovalDelay - property
1281
 
    @dbus_service_property(_interface, signature="t",
1282
 
                           access="readwrite")
1283
 
    def ApprovalDelay_dbus_property(self, value=None):
1284
 
        if value is None:       # get
1285
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1286
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1287
 
    
1288
 
    # ApprovalDuration - property
1289
 
    @dbus_service_property(_interface, signature="t",
1290
 
                           access="readwrite")
1291
 
    def ApprovalDuration_dbus_property(self, value=None):
1292
 
        if value is None:       # get
1293
 
            return dbus.UInt64(timedelta_to_milliseconds(
1294
 
                    self.approval_duration))
1295
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1296
 
    
1297
 
    # Name - property
1298
 
    @dbus_service_property(_interface, signature="s", access="read")
1299
 
    def Name_dbus_property(self):
1300
 
        return dbus.String(self.name)
1301
 
    
1302
 
    # Fingerprint - property
1303
 
    @dbus_service_property(_interface, signature="s", access="read")
1304
 
    def Fingerprint_dbus_property(self):
1305
 
        return dbus.String(self.fingerprint)
1306
 
    
1307
 
    # Host - property
1308
 
    @dbus_service_property(_interface, signature="s",
1309
 
                           access="readwrite")
1310
 
    def Host_dbus_property(self, value=None):
1311
 
        if value is None:       # get
1312
 
            return dbus.String(self.host)
1313
 
        self.host = unicode(value)
1314
 
    
1315
 
    # Created - property
1316
 
    @dbus_service_property(_interface, signature="s", access="read")
1317
 
    def Created_dbus_property(self):
1318
 
        return datetime_to_dbus(self.created)
1319
 
    
1320
 
    # LastEnabled - property
1321
 
    @dbus_service_property(_interface, signature="s", access="read")
1322
 
    def LastEnabled_dbus_property(self):
1323
 
        return datetime_to_dbus(self.last_enabled)
1324
 
    
1325
 
    # Enabled - property
1326
 
    @dbus_service_property(_interface, signature="b",
1327
 
                           access="readwrite")
1328
 
    def Enabled_dbus_property(self, value=None):
1329
 
        if value is None:       # get
1330
 
            return dbus.Boolean(self.enabled)
1331
 
        if value:
1332
 
            self.enable()
1333
 
        else:
1334
 
            self.disable()
1335
 
    
1336
 
    # LastCheckedOK - property
1337
 
    @dbus_service_property(_interface, signature="s",
1338
 
                           access="readwrite")
1339
 
    def LastCheckedOK_dbus_property(self, value=None):
1340
 
        if value is not None:
1341
 
            self.checked_ok()
1342
 
            return
1343
 
        return datetime_to_dbus(self.last_checked_ok)
1344
 
    
1345
 
    # LastCheckerStatus - property
1346
 
    @dbus_service_property(_interface, signature="n",
1347
 
                           access="read")
1348
 
    def LastCheckerStatus_dbus_property(self):
1349
 
        return dbus.Int16(self.last_checker_status)
1350
 
    
1351
 
    # Expires - property
1352
 
    @dbus_service_property(_interface, signature="s", access="read")
1353
 
    def Expires_dbus_property(self):
1354
 
        return datetime_to_dbus(self.expires)
1355
 
    
1356
 
    # LastApprovalRequest - property
1357
 
    @dbus_service_property(_interface, signature="s", access="read")
1358
 
    def LastApprovalRequest_dbus_property(self):
1359
 
        return datetime_to_dbus(self.last_approval_request)
1360
 
    
1361
 
    # Timeout - property
1362
 
    @dbus_service_property(_interface, signature="t",
1363
 
                           access="readwrite")
1364
 
    def Timeout_dbus_property(self, value=None):
1365
 
        if value is None:       # get
1366
 
            return dbus.UInt64(self.timeout_milliseconds())
1367
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1368
 
        # Reschedule timeout
1369
 
        if self.enabled:
1370
 
            now = datetime.datetime.utcnow()
1371
 
            time_to_die = timedelta_to_milliseconds(
1372
 
                (self.last_checked_ok + self.timeout) - now)
1373
 
            if time_to_die <= 0:
1374
 
                # The timeout has passed
1375
 
                self.disable()
1376
 
            else:
1377
 
                self.expires = (now +
1378
 
                                datetime.timedelta(milliseconds =
1379
 
                                                   time_to_die))
1380
 
                if (getattr(self, "disable_initiator_tag", None)
1381
 
                    is None):
1382
 
                    return
1383
 
                gobject.source_remove(self.disable_initiator_tag)
1384
 
                self.disable_initiator_tag = (gobject.timeout_add
1385
 
                                              (time_to_die,
1386
 
                                               self.disable))
1387
 
    
1388
 
    # ExtendedTimeout - property
1389
 
    @dbus_service_property(_interface, signature="t",
1390
 
                           access="readwrite")
1391
 
    def ExtendedTimeout_dbus_property(self, value=None):
1392
 
        if value is None:       # get
1393
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1394
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1395
 
    
1396
 
    # Interval - property
1397
 
    @dbus_service_property(_interface, signature="t",
1398
 
                           access="readwrite")
1399
 
    def Interval_dbus_property(self, value=None):
1400
 
        if value is None:       # get
1401
 
            return dbus.UInt64(self.interval_milliseconds())
1402
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1403
 
        if getattr(self, "checker_initiator_tag", None) is None:
1404
 
            return
1405
 
        if self.enabled:
1406
 
            # Reschedule checker run
1407
 
            gobject.source_remove(self.checker_initiator_tag)
1408
 
            self.checker_initiator_tag = (gobject.timeout_add
1409
 
                                          (value, self.start_checker))
1410
 
            self.start_checker()    # Start one now, too
1411
 
    
1412
 
    # Checker - property
1413
 
    @dbus_service_property(_interface, signature="s",
1414
 
                           access="readwrite")
1415
 
    def Checker_dbus_property(self, value=None):
1416
 
        if value is None:       # get
1417
 
            return dbus.String(self.checker_command)
1418
 
        self.checker_command = unicode(value)
1419
 
    
1420
 
    # CheckerRunning - property
1421
 
    @dbus_service_property(_interface, signature="b",
1422
 
                           access="readwrite")
1423
 
    def CheckerRunning_dbus_property(self, value=None):
1424
 
        if value is None:       # get
1425
 
            return dbus.Boolean(self.checker is not None)
1426
 
        if value:
1427
 
            self.start_checker()
1428
 
        else:
1429
 
            self.stop_checker()
1430
 
    
1431
 
    # ObjectPath - property
1432
 
    @dbus_service_property(_interface, signature="o", access="read")
1433
 
    def ObjectPath_dbus_property(self):
1434
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1435
 
    
1436
 
    # Secret = property
1437
 
    @dbus_service_property(_interface, signature="ay",
1438
 
                           access="write", byte_arrays=True)
1439
 
    def Secret_dbus_property(self, value):
1440
 
        self.secret = str(value)
1441
 
    
1442
 
    del _interface
1443
 
 
1444
 
 
1445
 
class ProxyClient(object):
1446
 
    def __init__(self, child_pipe, fpr, address):
1447
 
        self._pipe = child_pipe
1448
 
        self._pipe.send(('init', fpr, address))
1449
 
        if not self._pipe.recv():
1450
 
            raise KeyError()
1451
 
    
1452
 
    def __getattribute__(self, name):
1453
 
        if name == '_pipe':
1454
 
            return super(ProxyClient, self).__getattribute__(name)
1455
 
        self._pipe.send(('getattr', name))
1456
 
        data = self._pipe.recv()
1457
 
        if data[0] == 'data':
1458
 
            return data[1]
1459
 
        if data[0] == 'function':
1460
 
            def func(*args, **kwargs):
1461
 
                self._pipe.send(('funcall', name, args, kwargs))
1462
 
                return self._pipe.recv()[1]
1463
 
            return func
1464
 
    
1465
 
    def __setattr__(self, name, value):
1466
 
        if name == '_pipe':
1467
 
            return super(ProxyClient, self).__setattr__(name, value)
1468
 
        self._pipe.send(('setattr', name, value))
1469
 
 
1470
 
 
1471
 
class ClientDBusTransitional(ClientDBus):
1472
 
    __metaclass__ = AlternateDBusNamesMetaclass
1473
 
 
1474
 
 
1475
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1476
 
    """A class to handle client connections.
1477
 
    
1478
 
    Instantiated once for each connection to handle it.
 
248
    def still_valid(self, now=None):
 
249
        """Has the timeout not yet passed for this client?"""
 
250
        if now is None:
 
251
            now = datetime.datetime.now()
 
252
        if self.last_seen is None:
 
253
            return now < (self.created + self.timeout)
 
254
        else:
 
255
            return now < (self.last_seen + self.timeout)
 
256
 
 
257
 
 
258
def peer_certificate(session):
 
259
    # If not an OpenPGP certificate...
 
260
    if gnutls.library.functions.gnutls_certificate_type_get\
 
261
            (session._c_object) \
 
262
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
263
        # ...do the normal thing
 
264
        return session.peer_certificate
 
265
    list_size = ctypes.c_uint()
 
266
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
267
        (session._c_object, ctypes.byref(list_size))
 
268
    if list_size.value == 0:
 
269
        return None
 
270
    cert = cert_list[0]
 
271
    return ctypes.string_at(cert.data, cert.size)
 
272
 
 
273
 
 
274
def fingerprint(openpgp):
 
275
    # New empty GnuTLS certificate
 
276
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
277
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
278
        (ctypes.byref(crt))
 
279
    # New GnuTLS "datum" with the OpenPGP public key
 
280
    datum = gnutls.library.types.gnutls_datum_t\
 
281
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
282
                     ctypes.POINTER(ctypes.c_ubyte)),
 
283
         ctypes.c_uint(len(openpgp)))
 
284
    # Import the OpenPGP public key into the certificate
 
285
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
286
        (crt,
 
287
         ctypes.byref(datum),
 
288
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
289
    # New buffer for the fingerprint
 
290
    buffer = ctypes.create_string_buffer(20)
 
291
    buffer_length = ctypes.c_size_t()
 
292
    # Get the fingerprint from the certificate into the buffer
 
293
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
294
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
295
    # Deinit the certificate
 
296
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
297
    # Convert the buffer to a Python bytestring
 
298
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
299
    # Convert the bytestring to hexadecimal notation
 
300
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
301
    return hex_fpr
 
302
 
 
303
 
 
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
305
    """A TCP request handler class.
 
306
    Instantiated by IPv6_TCPServer for each request to handle it.
1479
307
    Note: This will run in its own forked process."""
1480
308
    
1481
309
    def handle(self):
1482
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1483
 
            logger.info("TCP connection from: %s",
1484
 
                        unicode(self.client_address))
1485
 
            logger.debug("Pipe FD: %d",
1486
 
                         self.server.child_pipe.fileno())
1487
 
            
1488
 
            session = (gnutls.connection
1489
 
                       .ClientSession(self.request,
1490
 
                                      gnutls.connection
1491
 
                                      .X509Credentials()))
1492
 
            
1493
 
            # Note: gnutls.connection.X509Credentials is really a
1494
 
            # generic GnuTLS certificate credentials object so long as
1495
 
            # no X.509 keys are added to it.  Therefore, we can use it
1496
 
            # here despite using OpenPGP certificates.
1497
 
            
1498
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1499
 
            #                      "+AES-256-CBC", "+SHA1",
1500
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1501
 
            #                      "+DHE-DSS"))
1502
 
            # Use a fallback default, since this MUST be set.
1503
 
            priority = self.server.gnutls_priority
1504
 
            if priority is None:
1505
 
                priority = "NORMAL"
1506
 
            (gnutls.library.functions
1507
 
             .gnutls_priority_set_direct(session._c_object,
1508
 
                                         priority, None))
1509
 
            
1510
 
            # Start communication using the Mandos protocol
1511
 
            # Get protocol number
1512
 
            line = self.request.makefile().readline()
1513
 
            logger.debug("Protocol version: %r", line)
1514
 
            try:
1515
 
                if int(line.strip().split()[0]) > 1:
1516
 
                    raise RuntimeError
1517
 
            except (ValueError, IndexError, RuntimeError) as error:
1518
 
                logger.error("Unknown protocol version: %s", error)
1519
 
                return
1520
 
            
1521
 
            # Start GnuTLS connection
1522
 
            try:
1523
 
                session.handshake()
1524
 
            except gnutls.errors.GNUTLSError as error:
1525
 
                logger.warning("Handshake failed: %s", error)
1526
 
                # Do not run session.bye() here: the session is not
1527
 
                # established.  Just abandon the request.
1528
 
                return
1529
 
            logger.debug("Handshake succeeded")
1530
 
            
1531
 
            approval_required = False
1532
 
            try:
1533
 
                try:
1534
 
                    fpr = self.fingerprint(self.peer_certificate
1535
 
                                           (session))
1536
 
                except (TypeError,
1537
 
                        gnutls.errors.GNUTLSError) as error:
1538
 
                    logger.warning("Bad certificate: %s", error)
1539
 
                    return
1540
 
                logger.debug("Fingerprint: %s", fpr)
1541
 
                
1542
 
                try:
1543
 
                    client = ProxyClient(child_pipe, fpr,
1544
 
                                         self.client_address)
1545
 
                except KeyError:
1546
 
                    return
1547
 
                
1548
 
                if client.approval_delay:
1549
 
                    delay = client.approval_delay
1550
 
                    client.approvals_pending += 1
1551
 
                    approval_required = True
1552
 
                
1553
 
                while True:
1554
 
                    if not client.enabled:
1555
 
                        logger.info("Client %s is disabled",
1556
 
                                       client.name)
1557
 
                        if self.server.use_dbus:
1558
 
                            # Emit D-Bus signal
1559
 
                            client.Rejected("Disabled")
1560
 
                        return
1561
 
                    
1562
 
                    if client.approved or not client.approval_delay:
1563
 
                        #We are approved or approval is disabled
1564
 
                        break
1565
 
                    elif client.approved is None:
1566
 
                        logger.info("Client %s needs approval",
1567
 
                                    client.name)
1568
 
                        if self.server.use_dbus:
1569
 
                            # Emit D-Bus signal
1570
 
                            client.NeedApproval(
1571
 
                                client.approval_delay_milliseconds(),
1572
 
                                client.approved_by_default)
1573
 
                    else:
1574
 
                        logger.warning("Client %s was not approved",
1575
 
                                       client.name)
1576
 
                        if self.server.use_dbus:
1577
 
                            # Emit D-Bus signal
1578
 
                            client.Rejected("Denied")
1579
 
                        return
1580
 
                    
1581
 
                    #wait until timeout or approved
1582
 
                    time = datetime.datetime.now()
1583
 
                    client.changedstate.acquire()
1584
 
                    (client.changedstate.wait
1585
 
                     (float(client.timedelta_to_milliseconds(delay)
1586
 
                            / 1000)))
1587
 
                    client.changedstate.release()
1588
 
                    time2 = datetime.datetime.now()
1589
 
                    if (time2 - time) >= delay:
1590
 
                        if not client.approved_by_default:
1591
 
                            logger.warning("Client %s timed out while"
1592
 
                                           " waiting for approval",
1593
 
                                           client.name)
1594
 
                            if self.server.use_dbus:
1595
 
                                # Emit D-Bus signal
1596
 
                                client.Rejected("Approval timed out")
1597
 
                            return
1598
 
                        else:
1599
 
                            break
1600
 
                    else:
1601
 
                        delay -= time2 - time
1602
 
                
1603
 
                sent_size = 0
1604
 
                while sent_size < len(client.secret):
1605
 
                    try:
1606
 
                        sent = session.send(client.secret[sent_size:])
1607
 
                    except gnutls.errors.GNUTLSError as error:
1608
 
                        logger.warning("gnutls send failed")
1609
 
                        return
1610
 
                    logger.debug("Sent: %d, remaining: %d",
1611
 
                                 sent, len(client.secret)
1612
 
                                 - (sent_size + sent))
1613
 
                    sent_size += sent
1614
 
                
1615
 
                logger.info("Sending secret to %s", client.name)
1616
 
                # bump the timeout using extended_timeout
1617
 
                client.bump_timeout(client.extended_timeout)
1618
 
                if self.server.use_dbus:
1619
 
                    # Emit D-Bus signal
1620
 
                    client.GotSecret()
1621
 
            
1622
 
            finally:
1623
 
                if approval_required:
1624
 
                    client.approvals_pending -= 1
1625
 
                try:
1626
 
                    session.bye()
1627
 
                except gnutls.errors.GNUTLSError as error:
1628
 
                    logger.warning("GnuTLS bye failed")
1629
 
    
1630
 
    @staticmethod
1631
 
    def peer_certificate(session):
1632
 
        "Return the peer's OpenPGP certificate as a bytestring"
1633
 
        # If not an OpenPGP certificate...
1634
 
        if (gnutls.library.functions
1635
 
            .gnutls_certificate_type_get(session._c_object)
1636
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1637
 
            # ...do the normal thing
1638
 
            return session.peer_certificate
1639
 
        list_size = ctypes.c_uint(1)
1640
 
        cert_list = (gnutls.library.functions
1641
 
                     .gnutls_certificate_get_peers
1642
 
                     (session._c_object, ctypes.byref(list_size)))
1643
 
        if not bool(cert_list) and list_size.value != 0:
1644
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1645
 
                                            " certificate")
1646
 
        if list_size.value == 0:
1647
 
            return None
1648
 
        cert = cert_list[0]
1649
 
        return ctypes.string_at(cert.data, cert.size)
1650
 
    
1651
 
    @staticmethod
1652
 
    def fingerprint(openpgp):
1653
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1654
 
        # New GnuTLS "datum" with the OpenPGP public key
1655
 
        datum = (gnutls.library.types
1656
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1657
 
                                             ctypes.POINTER
1658
 
                                             (ctypes.c_ubyte)),
1659
 
                                 ctypes.c_uint(len(openpgp))))
1660
 
        # New empty GnuTLS certificate
1661
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1662
 
        (gnutls.library.functions
1663
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1664
 
        # Import the OpenPGP public key into the certificate
1665
 
        (gnutls.library.functions
1666
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1667
 
                                    gnutls.library.constants
1668
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1669
 
        # Verify the self signature in the key
1670
 
        crtverify = ctypes.c_uint()
1671
 
        (gnutls.library.functions
1672
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1673
 
                                         ctypes.byref(crtverify)))
1674
 
        if crtverify.value != 0:
1675
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1676
 
            raise (gnutls.errors.CertificateSecurityError
1677
 
                   ("Verify failed"))
1678
 
        # New buffer for the fingerprint
1679
 
        buf = ctypes.create_string_buffer(20)
1680
 
        buf_len = ctypes.c_size_t()
1681
 
        # Get the fingerprint from the certificate into the buffer
1682
 
        (gnutls.library.functions
1683
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1684
 
                                             ctypes.byref(buf_len)))
1685
 
        # Deinit the certificate
1686
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1687
 
        # Convert the buffer to a Python bytestring
1688
 
        fpr = ctypes.string_at(buf, buf_len.value)
1689
 
        # Convert the bytestring to hexadecimal notation
1690
 
        hex_fpr = binascii.hexlify(fpr).upper()
1691
 
        return hex_fpr
1692
 
 
1693
 
 
1694
 
class MultiprocessingMixIn(object):
1695
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1696
 
    def sub_process_main(self, request, address):
1697
 
        try:
1698
 
            self.finish_request(request, address)
1699
 
        except Exception:
1700
 
            self.handle_error(request, address)
1701
 
        self.close_request(request)
1702
 
    
1703
 
    def process_request(self, request, address):
1704
 
        """Start a new process to process the request."""
1705
 
        proc = multiprocessing.Process(target = self.sub_process_main,
1706
 
                                       args = (request,
1707
 
                                               address))
1708
 
        proc.start()
1709
 
        return proc
1710
 
 
1711
 
 
1712
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1713
 
    """ adds a pipe to the MixIn """
1714
 
    def process_request(self, request, client_address):
1715
 
        """Overrides and wraps the original process_request().
1716
 
        
1717
 
        This function creates a new pipe in self.pipe
1718
 
        """
1719
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1720
 
        
1721
 
        proc = MultiprocessingMixIn.process_request(self, request,
1722
 
                                                    client_address)
1723
 
        self.child_pipe.close()
1724
 
        self.add_pipe(parent_pipe, proc)
1725
 
    
1726
 
    def add_pipe(self, parent_pipe, proc):
1727
 
        """Dummy function; override as necessary"""
1728
 
        raise NotImplementedError
1729
 
 
1730
 
 
1731
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1732
 
                     socketserver.TCPServer, object):
1733
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1734
 
    
 
310
        logger.debug(u"TCP connection from: %s",
 
311
                     unicode(self.client_address))
 
312
        session = gnutls.connection.ClientSession(self.request,
 
313
                                                  gnutls.connection.\
 
314
                                                  X509Credentials())
 
315
        
 
316
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
317
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
318
        #                "+DHE-DSS"))
 
319
        priority = "SECURE256"
 
320
        
 
321
        gnutls.library.functions.gnutls_priority_set_direct\
 
322
            (session._c_object, priority, None);
 
323
        
 
324
        try:
 
325
            session.handshake()
 
326
        except gnutls.errors.GNUTLSError, error:
 
327
            logger.debug(u"Handshake failed: %s", error)
 
328
            # Do not run session.bye() here: the session is not
 
329
            # established.  Just abandon the request.
 
330
            return
 
331
        try:
 
332
            fpr = fingerprint(peer_certificate(session))
 
333
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
334
            logger.debug(u"Bad certificate: %s", error)
 
335
            session.bye()
 
336
            return
 
337
        logger.debug(u"Fingerprint: %s", fpr)
 
338
        client = None
 
339
        for c in clients:
 
340
            if c.fingerprint == fpr:
 
341
                client = c
 
342
                break
 
343
        # Have to check if client.still_valid(), since it is possible
 
344
        # that the client timed out while establishing the GnuTLS
 
345
        # session.
 
346
        if (not client) or (not client.still_valid()):
 
347
            if client:
 
348
                logger.debug(u"Client %(name)s is invalid",
 
349
                             vars(client))
 
350
            else:
 
351
                logger.debug(u"Client not found for fingerprint: %s",
 
352
                             fpr)
 
353
            session.bye()
 
354
            return
 
355
        sent_size = 0
 
356
        while sent_size < len(client.secret):
 
357
            sent = session.send(client.secret[sent_size:])
 
358
            logger.debug(u"Sent: %d, remaining: %d",
 
359
                         sent, len(client.secret)
 
360
                         - (sent_size + sent))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1735
367
    Attributes:
1736
 
        enabled:        Boolean; whether this server is activated yet
1737
 
        interface:      None or a network interface name (string)
1738
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1739
370
    """
1740
 
    def __init__(self, server_address, RequestHandlerClass,
1741
 
                 interface=None, use_ipv6=True):
1742
 
        self.interface = interface
1743
 
        if use_ipv6:
1744
 
            self.address_family = socket.AF_INET6
1745
 
        socketserver.TCPServer.__init__(self, server_address,
1746
 
                                        RequestHandlerClass)
 
371
    address_family = socket.AF_INET6
 
372
    def __init__(self, *args, **kwargs):
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
 
376
        if "clients" in kwargs:
 
377
            self.clients = kwargs["clients"]
 
378
            del kwargs["clients"]
 
379
        return super(type(self), self).__init__(*args, **kwargs)
1747
380
    def server_bind(self):
1748
381
        """This overrides the normal server_bind() function
1749
382
        to bind to an interface if one was specified, and also NOT to
1750
383
        bind to an address or port if they were not specified."""
1751
 
        if self.interface is not None:
1752
 
            if SO_BINDTODEVICE is None:
1753
 
                logger.error("SO_BINDTODEVICE does not exist;"
1754
 
                             " cannot bind to interface %s",
1755
 
                             self.interface)
1756
 
            else:
1757
 
                try:
1758
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1759
 
                                           SO_BINDTODEVICE,
1760
 
                                           str(self.interface
1761
 
                                               + '\0'))
1762
 
                except socket.error as error:
1763
 
                    if error[0] == errno.EPERM:
1764
 
                        logger.error("No permission to"
1765
 
                                     " bind to interface %s",
1766
 
                                     self.interface)
1767
 
                    elif error[0] == errno.ENOPROTOOPT:
1768
 
                        logger.error("SO_BINDTODEVICE not available;"
1769
 
                                     " cannot bind to interface %s",
1770
 
                                     self.interface)
1771
 
                    else:
1772
 
                        raise
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
 
388
            try:
 
389
                self.socket.setsockopt(socket.SOL_SOCKET,
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
 
392
            except socket.error, error:
 
393
                if error[0] == errno.EPERM:
 
394
                    logger.warning(u"No permission to"
 
395
                                   u" bind to interface %s",
 
396
                                   self.options.interface)
 
397
                else:
 
398
                    raise error
1773
399
        # Only bind(2) the socket if we really need to.
1774
400
        if self.server_address[0] or self.server_address[1]:
1775
401
            if not self.server_address[0]:
1776
 
                if self.address_family == socket.AF_INET6:
1777
 
                    any_address = "::" # in6addr_any
1778
 
                else:
1779
 
                    any_address = socket.INADDR_ANY
1780
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1781
404
                                       self.server_address[1])
1782
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1783
406
                self.server_address = (self.server_address[0],
1784
407
                                       0)
1785
 
#                 if self.interface:
1786
 
#                     self.server_address = (self.server_address[0],
1787
 
#                                            0, # port
1788
 
#                                            0, # flowinfo
1789
 
#                                            if_nametoindex
1790
 
#                                            (self.interface))
1791
 
            return socketserver.TCPServer.server_bind(self)
1792
 
 
1793
 
 
1794
 
class MandosServer(IPv6_TCPServer):
1795
 
    """Mandos server.
1796
 
    
1797
 
    Attributes:
1798
 
        clients:        set of Client objects
1799
 
        gnutls_priority GnuTLS priority string
1800
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1801
 
    
1802
 
    Assumes a gobject.MainLoop event loop.
1803
 
    """
1804
 
    def __init__(self, server_address, RequestHandlerClass,
1805
 
                 interface=None, use_ipv6=True, clients=None,
1806
 
                 gnutls_priority=None, use_dbus=True):
1807
 
        self.enabled = False
1808
 
        self.clients = clients
1809
 
        if self.clients is None:
1810
 
            self.clients = {}
1811
 
        self.use_dbus = use_dbus
1812
 
        self.gnutls_priority = gnutls_priority
1813
 
        IPv6_TCPServer.__init__(self, server_address,
1814
 
                                RequestHandlerClass,
1815
 
                                interface = interface,
1816
 
                                use_ipv6 = use_ipv6)
1817
 
    def server_activate(self):
1818
 
        if self.enabled:
1819
 
            return socketserver.TCPServer.server_activate(self)
1820
 
    
1821
 
    def enable(self):
1822
 
        self.enabled = True
1823
 
    
1824
 
    def add_pipe(self, parent_pipe, proc):
1825
 
        # Call "handle_ipc" for both data and EOF events
1826
 
        gobject.io_add_watch(parent_pipe.fileno(),
1827
 
                             gobject.IO_IN | gobject.IO_HUP,
1828
 
                             functools.partial(self.handle_ipc,
1829
 
                                               parent_pipe =
1830
 
                                               parent_pipe,
1831
 
                                               proc = proc))
1832
 
    
1833
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1834
 
                   proc = None, client_object=None):
1835
 
        condition_names = {
1836
 
            gobject.IO_IN: "IN",   # There is data to read.
1837
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1838
 
                                    # blocking).
1839
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1840
 
            gobject.IO_ERR: "ERR", # Error condition.
1841
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1842
 
                                    # broken, usually for pipes and
1843
 
                                    # sockets).
1844
 
            }
1845
 
        conditions_string = ' | '.join(name
1846
 
                                       for cond, name in
1847
 
                                       condition_names.iteritems()
1848
 
                                       if cond & condition)
1849
 
        # error, or the other end of multiprocessing.Pipe has closed
1850
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1851
 
            # Wait for other process to exit
1852
 
            proc.join()
1853
 
            return False
1854
 
        
1855
 
        # Read a request from the child
1856
 
        request = parent_pipe.recv()
1857
 
        command = request[0]
1858
 
        
1859
 
        if command == 'init':
1860
 
            fpr = request[1]
1861
 
            address = request[2]
1862
 
            
1863
 
            for c in self.clients.itervalues():
1864
 
                if c.fingerprint == fpr:
1865
 
                    client = c
1866
 
                    break
1867
 
            else:
1868
 
                logger.info("Client not found for fingerprint: %s, ad"
1869
 
                            "dress: %s", fpr, address)
1870
 
                if self.use_dbus:
1871
 
                    # Emit D-Bus signal
1872
 
                    mandos_dbus_service.ClientNotFound(fpr,
1873
 
                                                       address[0])
1874
 
                parent_pipe.send(False)
1875
 
                return False
1876
 
            
1877
 
            gobject.io_add_watch(parent_pipe.fileno(),
1878
 
                                 gobject.IO_IN | gobject.IO_HUP,
1879
 
                                 functools.partial(self.handle_ipc,
1880
 
                                                   parent_pipe =
1881
 
                                                   parent_pipe,
1882
 
                                                   proc = proc,
1883
 
                                                   client_object =
1884
 
                                                   client))
1885
 
            parent_pipe.send(True)
1886
 
            # remove the old hook in favor of the new above hook on
1887
 
            # same fileno
1888
 
            return False
1889
 
        if command == 'funcall':
1890
 
            funcname = request[1]
1891
 
            args = request[2]
1892
 
            kwargs = request[3]
1893
 
            
1894
 
            parent_pipe.send(('data', getattr(client_object,
1895
 
                                              funcname)(*args,
1896
 
                                                         **kwargs)))
1897
 
        
1898
 
        if command == 'getattr':
1899
 
            attrname = request[1]
1900
 
            if callable(client_object.__getattribute__(attrname)):
1901
 
                parent_pipe.send(('function',))
1902
 
            else:
1903
 
                parent_pipe.send(('data', client_object
1904
 
                                  .__getattribute__(attrname)))
1905
 
        
1906
 
        if command == 'setattr':
1907
 
            attrname = request[1]
1908
 
            value = request[2]
1909
 
            setattr(client_object, attrname, value)
1910
 
        
1911
 
        return True
 
408
            return super(type(self), self).server_bind()
1912
409
 
1913
410
 
1914
411
def string_to_delta(interval):
1915
412
    """Parse a string and return a datetime.timedelta
1916
 
    
 
413
 
1917
414
    >>> string_to_delta('7d')
1918
415
    datetime.timedelta(7)
1919
416
    >>> string_to_delta('60s')
1922
419
    datetime.timedelta(0, 3600)
1923
420
    >>> string_to_delta('24h')
1924
421
    datetime.timedelta(1)
1925
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1926
423
    datetime.timedelta(7)
1927
 
    >>> string_to_delta('5m 30s')
1928
 
    datetime.timedelta(0, 330)
1929
424
    """
1930
 
    timevalue = datetime.timedelta(0)
1931
 
    for s in interval.split():
1932
 
        try:
1933
 
            suffix = unicode(s[-1])
1934
 
            value = int(s[:-1])
1935
 
            if suffix == "d":
1936
 
                delta = datetime.timedelta(value)
1937
 
            elif suffix == "s":
1938
 
                delta = datetime.timedelta(0, value)
1939
 
            elif suffix == "m":
1940
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1941
 
            elif suffix == "h":
1942
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1943
 
            elif suffix == "w":
1944
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1945
 
            else:
1946
 
                raise ValueError("Unknown suffix %r" % suffix)
1947
 
        except (ValueError, IndexError) as e:
1948
 
            raise ValueError(*(e.args))
1949
 
        timevalue += delta
1950
 
    return timevalue
1951
 
 
1952
 
 
1953
 
def daemon(nochdir = False, noclose = False):
1954
 
    """See daemon(3).  Standard BSD Unix function.
1955
 
    
1956
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1957
 
    if os.fork():
1958
 
        sys.exit()
1959
 
    os.setsid()
1960
 
    if not nochdir:
1961
 
        os.chdir("/")
1962
 
    if os.fork():
1963
 
        sys.exit()
1964
 
    if not noclose:
1965
 
        # Close all standard open file descriptors
1966
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1967
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1968
 
            raise OSError(errno.ENODEV,
1969
 
                          "%s not a character device"
1970
 
                          % os.path.devnull)
1971
 
        os.dup2(null, sys.stdin.fileno())
1972
 
        os.dup2(null, sys.stdout.fileno())
1973
 
        os.dup2(null, sys.stderr.fileno())
1974
 
        if null > 2:
1975
 
            os.close(null)
1976
 
 
1977
 
 
1978
 
def main():
1979
 
    
1980
 
    ##################################################################
1981
 
    # Parsing of options, both command line and config file
1982
 
    
1983
 
    parser = argparse.ArgumentParser()
1984
 
    parser.add_argument("-v", "--version", action="version",
1985
 
                        version = "%%(prog)s %s" % version,
1986
 
                        help="show version number and exit")
1987
 
    parser.add_argument("-i", "--interface", metavar="IF",
1988
 
                        help="Bind to interface IF")
1989
 
    parser.add_argument("-a", "--address",
1990
 
                        help="Address to listen for requests on")
1991
 
    parser.add_argument("-p", "--port", type=int,
1992
 
                        help="Port number to receive requests on")
1993
 
    parser.add_argument("--check", action="store_true",
1994
 
                        help="Run self-test")
1995
 
    parser.add_argument("--debug", action="store_true",
1996
 
                        help="Debug mode; run in foreground and log"
1997
 
                        " to terminal")
1998
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1999
 
                        help="Debug level for stdout output")
2000
 
    parser.add_argument("--priority", help="GnuTLS"
2001
 
                        " priority string (see GnuTLS documentation)")
2002
 
    parser.add_argument("--servicename",
2003
 
                        metavar="NAME", help="Zeroconf service name")
2004
 
    parser.add_argument("--configdir",
2005
 
                        default="/etc/mandos", metavar="DIR",
2006
 
                        help="Directory to search for configuration"
2007
 
                        " files")
2008
 
    parser.add_argument("--no-dbus", action="store_false",
2009
 
                        dest="use_dbus", help="Do not provide D-Bus"
2010
 
                        " system bus interface")
2011
 
    parser.add_argument("--no-ipv6", action="store_false",
2012
 
                        dest="use_ipv6", help="Do not use IPv6")
2013
 
    parser.add_argument("--no-restore", action="store_false",
2014
 
                        dest="restore", help="Do not restore stored"
2015
 
                        " state")
2016
 
    parser.add_argument("--statedir", metavar="DIR",
2017
 
                        help="Directory to save/restore state in")
2018
 
    
2019
 
    options = parser.parse_args()
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
 
439
            raise ValueError
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
457
                 serviceName, serviceType)
 
458
    
 
459
    group.AddService(
 
460
            serviceInterface,           # interface
 
461
            avahi.PROTO_INET6,          # protocol
 
462
            dbus.UInt32(0),             # flags
 
463
            serviceName, serviceType,
 
464
            domain, host,
 
465
            dbus.UInt16(servicePort),
 
466
            avahi.string_array_to_txt_array(serviceTXT))
 
467
    group.Commit()
 
468
 
 
469
 
 
470
def remove_service():
 
471
    """From the Avahi server example code"""
 
472
    global group
 
473
    
 
474
    if not group is None:
 
475
        group.Reset()
 
476
 
 
477
 
 
478
def server_state_changed(state):
 
479
    """From the Avahi server example code"""
 
480
    if state == avahi.SERVER_COLLISION:
 
481
        logger.warning(u"Server name collision")
 
482
        remove_service()
 
483
    elif state == avahi.SERVER_RUNNING:
 
484
        add_service()
 
485
 
 
486
 
 
487
def entry_group_state_changed(state, error):
 
488
    """From the Avahi server example code"""
 
489
    global serviceName, server, rename_count
 
490
    
 
491
    logger.debug(u"state change: %i", state)
 
492
    
 
493
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
494
        logger.debug(u"Service established.")
 
495
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
496
        
 
497
        rename_count = rename_count - 1
 
498
        if rename_count > 0:
 
499
            name = server.GetAlternativeServiceName(name)
 
500
            logger.warning(u"Service name collision, "
 
501
                           u"changing name to '%s' ...", name)
 
502
            remove_service()
 
503
            add_service()
 
504
            
 
505
        else:
 
506
            logger.error(u"No suitable service name found "
 
507
                         u"after %i retries, exiting.",
 
508
                         n_rename)
 
509
            main_loop.quit()
 
510
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
511
        logger.error(u"Error in group state changed %s",
 
512
                     unicode(error))
 
513
        main_loop.quit()
 
514
        return
 
515
 
 
516
 
 
517
def if_nametoindex(interface):
 
518
    """Call the C function if_nametoindex()"""
 
519
    try:
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
 
522
    except (OSError, AttributeError):
 
523
        if "struct" not in sys.modules:
 
524
            import struct
 
525
        if "fcntl" not in sys.modules:
 
526
            import fcntl
 
527
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
528
        s = socket.socket()
 
529
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
530
                            struct.pack("16s16x", interface))
 
531
        s.close()
 
532
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
533
        return interface_index
 
534
 
 
535
 
 
536
if __name__ == '__main__':
 
537
    parser = OptionParser()
 
538
    parser.add_option("-i", "--interface", type="string",
 
539
                      default=None, metavar="IF",
 
540
                      help="Bind to interface IF")
 
541
    parser.add_option("--cert", type="string", default="cert.pem",
 
542
                      metavar="FILE",
 
543
                      help="Public key certificate PEM file to use")
 
544
    parser.add_option("--key", type="string", default="key.pem",
 
545
                      metavar="FILE",
 
546
                      help="Private key PEM file to use")
 
547
    parser.add_option("--ca", type="string", default="ca.pem",
 
548
                      metavar="FILE",
 
549
                      help="Certificate Authority certificate PEM file to use")
 
550
    parser.add_option("--crl", type="string", default="crl.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Revokation List PEM file to use")
 
553
    parser.add_option("-p", "--port", type="int", default=None,
 
554
                      help="Port number to receive requests on")
 
555
    parser.add_option("--timeout", type="string", # Parsed later
 
556
                      default="1h",
 
557
                      help="Amount of downtime allowed for clients")
 
558
    parser.add_option("--interval", type="string", # Parsed later
 
559
                      default="5m",
 
560
                      help="How often to check that a client is up")
 
561
    parser.add_option("--check", action="store_true", default=False,
 
562
                      help="Run self-test")
 
563
    parser.add_option("--debug", action="store_true", default=False,
 
564
                      help="Debug mode")
 
565
    (options, args) = parser.parse_args()
2020
566
    
2021
567
    if options.check:
2022
568
        import doctest
2023
569
        doctest.testmod()
2024
570
        sys.exit()
2025
571
    
2026
 
    # Default values for config file for server-global settings
2027
 
    server_defaults = { "interface": "",
2028
 
                        "address": "",
2029
 
                        "port": "",
2030
 
                        "debug": "False",
2031
 
                        "priority":
2032
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
2033
 
                        "servicename": "Mandos",
2034
 
                        "use_dbus": "True",
2035
 
                        "use_ipv6": "True",
2036
 
                        "debuglevel": "",
2037
 
                        "restore": "True",
2038
 
                        "statedir": "/var/lib/mandos"
2039
 
                        }
2040
 
    
2041
 
    # Parse config file for server-global settings
2042
 
    server_config = configparser.SafeConfigParser(server_defaults)
2043
 
    del server_defaults
2044
 
    server_config.read(os.path.join(options.configdir,
2045
 
                                    "mandos.conf"))
2046
 
    # Convert the SafeConfigParser object to a dict
2047
 
    server_settings = server_config.defaults()
2048
 
    # Use the appropriate methods on the non-string config options
2049
 
    for option in ("debug", "use_dbus", "use_ipv6"):
2050
 
        server_settings[option] = server_config.getboolean("DEFAULT",
2051
 
                                                           option)
2052
 
    if server_settings["port"]:
2053
 
        server_settings["port"] = server_config.getint("DEFAULT",
2054
 
                                                       "port")
2055
 
    del server_config
2056
 
    
2057
 
    # Override the settings from the config file with command line
2058
 
    # options, if set.
2059
 
    for option in ("interface", "address", "port", "debug",
2060
 
                   "priority", "servicename", "configdir",
2061
 
                   "use_dbus", "use_ipv6", "debuglevel", "restore",
2062
 
                   "statedir"):
2063
 
        value = getattr(options, option)
2064
 
        if value is not None:
2065
 
            server_settings[option] = value
2066
 
    del options
2067
 
    # Force all strings to be unicode
2068
 
    for option in server_settings.keys():
2069
 
        if type(server_settings[option]) is str:
2070
 
            server_settings[option] = unicode(server_settings[option])
2071
 
    # Now we have our good server settings in "server_settings"
2072
 
    
2073
 
    ##################################################################
2074
 
    
2075
 
    # For convenience
2076
 
    debug = server_settings["debug"]
2077
 
    debuglevel = server_settings["debuglevel"]
2078
 
    use_dbus = server_settings["use_dbus"]
2079
 
    use_ipv6 = server_settings["use_ipv6"]
2080
 
    stored_state_path = os.path.join(server_settings["statedir"],
2081
 
                                     stored_state_file)
2082
 
    
2083
 
    if debug:
2084
 
        initlogger(debug, logging.DEBUG)
2085
 
    else:
2086
 
        if not debuglevel:
2087
 
            initlogger(debug)
2088
 
        else:
2089
 
            level = getattr(logging, debuglevel.upper())
2090
 
            initlogger(debug, level)
2091
 
    
2092
 
    if server_settings["servicename"] != "Mandos":
2093
 
        syslogger.setFormatter(logging.Formatter
2094
 
                               ('Mandos (%s) [%%(process)d]:'
2095
 
                                ' %%(levelname)s: %%(message)s'
2096
 
                                % server_settings["servicename"]))
2097
 
    
2098
 
    # Parse config file with clients
2099
 
    client_config = configparser.SafeConfigParser(Client
2100
 
                                                  .client_defaults)
2101
 
    client_config.read(os.path.join(server_settings["configdir"],
2102
 
                                    "clients.conf"))
2103
 
    
2104
 
    global mandos_dbus_service
2105
 
    mandos_dbus_service = None
2106
 
    
2107
 
    tcp_server = MandosServer((server_settings["address"],
2108
 
                               server_settings["port"]),
2109
 
                              ClientHandler,
2110
 
                              interface=(server_settings["interface"]
2111
 
                                         or None),
2112
 
                              use_ipv6=use_ipv6,
2113
 
                              gnutls_priority=
2114
 
                              server_settings["priority"],
2115
 
                              use_dbus=use_dbus)
2116
 
    if not debug:
2117
 
        pidfilename = "/var/run/mandos.pid"
2118
 
        try:
2119
 
            pidfile = open(pidfilename, "w")
2120
 
        except IOError:
2121
 
            logger.error("Could not open file %r", pidfilename)
2122
 
    
2123
 
    try:
2124
 
        uid = pwd.getpwnam("_mandos").pw_uid
2125
 
        gid = pwd.getpwnam("_mandos").pw_gid
2126
 
    except KeyError:
2127
 
        try:
2128
 
            uid = pwd.getpwnam("mandos").pw_uid
2129
 
            gid = pwd.getpwnam("mandos").pw_gid
2130
 
        except KeyError:
2131
 
            try:
2132
 
                uid = pwd.getpwnam("nobody").pw_uid
2133
 
                gid = pwd.getpwnam("nobody").pw_gid
2134
 
            except KeyError:
2135
 
                uid = 65534
2136
 
                gid = 65534
2137
 
    try:
2138
 
        os.setgid(gid)
2139
 
        os.setuid(uid)
2140
 
    except OSError as error:
2141
 
        if error[0] != errno.EPERM:
2142
 
            raise error
2143
 
    
2144
 
    if debug:
2145
 
        # Enable all possible GnuTLS debugging
2146
 
        
2147
 
        # "Use a log level over 10 to enable all debugging options."
2148
 
        # - GnuTLS manual
2149
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
2150
 
        
2151
 
        @gnutls.library.types.gnutls_log_func
2152
 
        def debug_gnutls(level, string):
2153
 
            logger.debug("GnuTLS: %s", string[:-1])
2154
 
        
2155
 
        (gnutls.library.functions
2156
 
         .gnutls_global_set_log_function(debug_gnutls))
2157
 
        
2158
 
        # Redirect stdin so all checkers get /dev/null
2159
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2160
 
        os.dup2(null, sys.stdin.fileno())
2161
 
        if null > 2:
2162
 
            os.close(null)
2163
 
    
2164
 
    # Need to fork before connecting to D-Bus
2165
 
    if not debug:
2166
 
        # Close all input and output, do double fork, etc.
2167
 
        daemon()
2168
 
    
2169
 
    gobject.threads_init()
2170
 
    
2171
 
    global main_loop
2172
 
    # From the Avahi example code
 
572
    # Parse the time arguments
 
573
    try:
 
574
        options.timeout = string_to_delta(options.timeout)
 
575
    except ValueError:
 
576
        parser.error("option --timeout: Unparseable time")
 
577
    try:
 
578
        options.interval = string_to_delta(options.interval)
 
579
    except ValueError:
 
580
        parser.error("option --interval: Unparseable time")
 
581
    
 
582
    # Parse config file
 
583
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
584
    client_config = ConfigParser.SafeConfigParser(defaults)
 
585
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
586
    client_config.read("mandos-clients.conf")
 
587
    
 
588
    # From the Avahi server example code
2173
589
    DBusGMainLoop(set_as_default=True )
2174
590
    main_loop = gobject.MainLoop()
2175
591
    bus = dbus.SystemBus()
2176
 
    # End of Avahi example code
2177
 
    if use_dbus:
2178
 
        try:
2179
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
2180
 
                                            bus, do_not_queue=True)
2181
 
            old_bus_name = (dbus.service.BusName
2182
 
                            ("se.bsnet.fukt.Mandos", bus,
2183
 
                             do_not_queue=True))
2184
 
        except dbus.exceptions.NameExistsException as e:
2185
 
            logger.error(unicode(e) + ", disabling D-Bus")
2186
 
            use_dbus = False
2187
 
            server_settings["use_dbus"] = False
2188
 
            tcp_server.use_dbus = False
2189
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2190
 
    service = AvahiServiceToSyslog(name =
2191
 
                                   server_settings["servicename"],
2192
 
                                   servicetype = "_mandos._tcp",
2193
 
                                   protocol = protocol, bus = bus)
2194
 
    if server_settings["interface"]:
2195
 
        service.interface = (if_nametoindex
2196
 
                             (str(server_settings["interface"])))
2197
 
    
2198
 
    global multiprocessing_manager
2199
 
    multiprocessing_manager = multiprocessing.Manager()
2200
 
    
2201
 
    client_class = Client
2202
 
    if use_dbus:
2203
 
        client_class = functools.partial(ClientDBusTransitional,
2204
 
                                         bus = bus)
2205
 
    
2206
 
    client_settings = Client.config_parser(client_config)
2207
 
    old_client_settings = {}
2208
 
    clients_data = {}
2209
 
    
2210
 
    # Get client data and settings from last running state.
2211
 
    if server_settings["restore"]:
2212
 
        try:
2213
 
            with open(stored_state_path, "rb") as stored_state:
2214
 
                clients_data, old_client_settings = (pickle.load
2215
 
                                                     (stored_state))
2216
 
            os.remove(stored_state_path)
2217
 
        except IOError as e:
2218
 
            logger.warning("Could not load persistent state: {0}"
2219
 
                           .format(e))
2220
 
            if e.errno != errno.ENOENT:
2221
 
                raise
2222
 
        except EOFError as e:
2223
 
            logger.warning("Could not load persistent state: "
2224
 
                           "EOFError: {0}".format(e))
2225
 
    
2226
 
    with PGPEngine() as pgp:
2227
 
        for client_name, client in clients_data.iteritems():
2228
 
            # Decide which value to use after restoring saved state.
2229
 
            # We have three different values: Old config file,
2230
 
            # new config file, and saved state.
2231
 
            # New config value takes precedence if it differs from old
2232
 
            # config value, otherwise use saved state.
2233
 
            for name, value in client_settings[client_name].items():
2234
 
                try:
2235
 
                    # For each value in new config, check if it
2236
 
                    # differs from the old config value (Except for
2237
 
                    # the "secret" attribute)
2238
 
                    if (name != "secret" and
2239
 
                        value != old_client_settings[client_name]
2240
 
                        [name]):
2241
 
                        client[name] = value
2242
 
                except KeyError:
2243
 
                    pass
2244
 
            
2245
 
            # Clients who has passed its expire date can still be
2246
 
            # enabled if its last checker was successful.  Clients
2247
 
            # whose checker succeeded before we stored its state is
2248
 
            # assumed to have successfully run all checkers during
2249
 
            # downtime.
2250
 
            if client["enabled"]:
2251
 
                if datetime.datetime.utcnow() >= client["expires"]:
2252
 
                    if not client["last_checked_ok"]:
2253
 
                        logger.warning(
2254
 
                            "disabling client {0} - Client never "
2255
 
                            "performed a successful checker"
2256
 
                            .format(client_name))
2257
 
                        client["enabled"] = False
2258
 
                    elif client["last_checker_status"] != 0:
2259
 
                        logger.warning(
2260
 
                            "disabling client {0} - Client "
2261
 
                            "last checker failed with error code {1}"
2262
 
                            .format(client_name,
2263
 
                                    client["last_checker_status"]))
2264
 
                        client["enabled"] = False
2265
 
                    else:
2266
 
                        client["expires"] = (datetime.datetime
2267
 
                                             .utcnow()
2268
 
                                             + client["timeout"])
2269
 
                        logger.debug("Last checker succeeded,"
2270
 
                                     " keeping {0} enabled"
2271
 
                                     .format(client_name))
2272
 
            try:
2273
 
                client["secret"] = (
2274
 
                    pgp.decrypt(client["encrypted_secret"],
2275
 
                                client_settings[client_name]
2276
 
                                ["secret"]))
2277
 
            except PGPError:
2278
 
                # If decryption fails, we use secret from new settings
2279
 
                logger.debug("Failed to decrypt {0} old secret"
2280
 
                             .format(client_name))
2281
 
                client["secret"] = (
2282
 
                    client_settings[client_name]["secret"])
2283
 
 
2284
 
    
2285
 
    # Add/remove clients based on new changes made to config
2286
 
    for client_name in (set(old_client_settings)
2287
 
                        - set(client_settings)):
2288
 
        del clients_data[client_name]
2289
 
    for client_name in (set(client_settings)
2290
 
                        - set(old_client_settings)):
2291
 
        clients_data[client_name] = client_settings[client_name]
2292
 
 
2293
 
    # Create all client objects
2294
 
    for client_name, client in clients_data.iteritems():
2295
 
        tcp_server.clients[client_name] = client_class(
2296
 
            name = client_name, settings = client)
2297
 
    
2298
 
    if not tcp_server.clients:
2299
 
        logger.warning("No clients defined")
2300
 
        
2301
 
    if not debug:
2302
 
        try:
2303
 
            with pidfile:
2304
 
                pid = os.getpid()
2305
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2306
 
            del pidfile
2307
 
        except IOError:
2308
 
            logger.error("Could not write to file %r with PID %d",
2309
 
                         pidfilename, pid)
2310
 
        except NameError:
2311
 
            # "pidfile" was never created
2312
 
            pass
2313
 
        del pidfilename
2314
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2315
 
    
2316
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2317
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2318
 
    
2319
 
    if use_dbus:
2320
 
        class MandosDBusService(dbus.service.Object):
2321
 
            """A D-Bus proxy object"""
2322
 
            def __init__(self):
2323
 
                dbus.service.Object.__init__(self, bus, "/")
2324
 
            _interface = "se.recompile.Mandos"
2325
 
            
2326
 
            @dbus.service.signal(_interface, signature="o")
2327
 
            def ClientAdded(self, objpath):
2328
 
                "D-Bus signal"
2329
 
                pass
2330
 
            
2331
 
            @dbus.service.signal(_interface, signature="ss")
2332
 
            def ClientNotFound(self, fingerprint, address):
2333
 
                "D-Bus signal"
2334
 
                pass
2335
 
            
2336
 
            @dbus.service.signal(_interface, signature="os")
2337
 
            def ClientRemoved(self, objpath, name):
2338
 
                "D-Bus signal"
2339
 
                pass
2340
 
            
2341
 
            @dbus.service.method(_interface, out_signature="ao")
2342
 
            def GetAllClients(self):
2343
 
                "D-Bus method"
2344
 
                return dbus.Array(c.dbus_object_path
2345
 
                                  for c in
2346
 
                                  tcp_server.clients.itervalues())
2347
 
            
2348
 
            @dbus.service.method(_interface,
2349
 
                                 out_signature="a{oa{sv}}")
2350
 
            def GetAllClientsWithProperties(self):
2351
 
                "D-Bus method"
2352
 
                return dbus.Dictionary(
2353
 
                    ((c.dbus_object_path, c.GetAll(""))
2354
 
                     for c in tcp_server.clients.itervalues()),
2355
 
                    signature="oa{sv}")
2356
 
            
2357
 
            @dbus.service.method(_interface, in_signature="o")
2358
 
            def RemoveClient(self, object_path):
2359
 
                "D-Bus method"
2360
 
                for c in tcp_server.clients.itervalues():
2361
 
                    if c.dbus_object_path == object_path:
2362
 
                        del tcp_server.clients[c.name]
2363
 
                        c.remove_from_connection()
2364
 
                        # Don't signal anything except ClientRemoved
2365
 
                        c.disable(quiet=True)
2366
 
                        # Emit D-Bus signal
2367
 
                        self.ClientRemoved(object_path, c.name)
2368
 
                        return
2369
 
                raise KeyError(object_path)
2370
 
            
2371
 
            del _interface
2372
 
        
2373
 
        class MandosDBusServiceTransitional(MandosDBusService):
2374
 
            __metaclass__ = AlternateDBusNamesMetaclass
2375
 
        mandos_dbus_service = MandosDBusServiceTransitional()
2376
 
    
2377
 
    def cleanup():
2378
 
        "Cleanup function; run on exit"
2379
 
        service.cleanup()
2380
 
        
2381
 
        multiprocessing.active_children()
2382
 
        if not (tcp_server.clients or client_settings):
2383
 
            return
2384
 
        
2385
 
        # Store client before exiting. Secrets are encrypted with key
2386
 
        # based on what config file has. If config file is
2387
 
        # removed/edited, old secret will thus be unrecovable.
2388
 
        clients = {}
2389
 
        with PGPEngine() as pgp:
2390
 
            for client in tcp_server.clients.itervalues():
2391
 
                key = client_settings[client.name]["secret"]
2392
 
                client.encrypted_secret = pgp.encrypt(client.secret,
2393
 
                                                      key)
2394
 
                client_dict = {}
2395
 
                
2396
 
                # A list of attributes that can not be pickled
2397
 
                # + secret.
2398
 
                exclude = set(("bus", "changedstate", "secret",
2399
 
                               "checker"))
2400
 
                for name, typ in (inspect.getmembers
2401
 
                                  (dbus.service.Object)):
2402
 
                    exclude.add(name)
2403
 
                
2404
 
                client_dict["encrypted_secret"] = (client
2405
 
                                                   .encrypted_secret)
2406
 
                for attr in client.client_structure:
2407
 
                    if attr not in exclude:
2408
 
                        client_dict[attr] = getattr(client, attr)
2409
 
                
2410
 
                clients[client.name] = client_dict
2411
 
                del client_settings[client.name]["secret"]
2412
 
        
2413
 
        try:
2414
 
            tempfd, tempname = tempfile.mkstemp(suffix=".pickle",
2415
 
                                                prefix="clients-",
2416
 
                                                dir=os.path.dirname
2417
 
                                                (stored_state_path))
2418
 
            with os.fdopen(tempfd, "wb") as stored_state:
2419
 
                pickle.dump((clients, client_settings), stored_state)
2420
 
            os.rename(tempname, stored_state_path)
2421
 
        except (IOError, OSError) as e:
2422
 
            logger.warning("Could not save persistent state: {0}"
2423
 
                           .format(e))
2424
 
            if not debug:
2425
 
                try:
2426
 
                    os.remove(tempname)
2427
 
                except NameError:
2428
 
                    pass
2429
 
            if e.errno not in set((errno.ENOENT, errno.EACCES,
2430
 
                                   errno.EEXIST)):
2431
 
                raise e
2432
 
        
2433
 
        # Delete all clients, and settings from config
2434
 
        while tcp_server.clients:
2435
 
            name, client = tcp_server.clients.popitem()
2436
 
            if use_dbus:
2437
 
                client.remove_from_connection()
2438
 
            # Don't signal anything except ClientRemoved
2439
 
            client.disable(quiet=True)
2440
 
            if use_dbus:
2441
 
                # Emit D-Bus signal
2442
 
                mandos_dbus_service.ClientRemoved(client
2443
 
                                                  .dbus_object_path,
2444
 
                                                  client.name)
2445
 
        client_settings.clear()
2446
 
    
2447
 
    atexit.register(cleanup)
2448
 
    
2449
 
    for client in tcp_server.clients.itervalues():
2450
 
        if use_dbus:
2451
 
            # Emit D-Bus signal
2452
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2453
 
        # Need to initiate checking of clients
2454
 
        if client.enabled:
2455
 
            client.init_checker()
2456
 
    
2457
 
    tcp_server.enable()
2458
 
    tcp_server.server_activate()
2459
 
    
2460
 
    # Find out what port we got
2461
 
    service.port = tcp_server.socket.getsockname()[1]
2462
 
    if use_ipv6:
2463
 
        logger.info("Now listening on address %r, port %d,"
2464
 
                    " flowinfo %d, scope_id %d"
2465
 
                    % tcp_server.socket.getsockname())
2466
 
    else:                       # IPv4
2467
 
        logger.info("Now listening on address %r, port %d"
2468
 
                    % tcp_server.socket.getsockname())
2469
 
    
2470
 
    #service.interface = tcp_server.socket.getsockname()[3]
2471
 
    
 
592
    server = dbus.Interface(
 
593
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
594
            avahi.DBUS_INTERFACE_SERVER )
 
595
    # End of Avahi example code
 
596
    
 
597
    debug = options.debug
 
598
    
 
599
    clients = Set()
 
600
    def remove_from_clients(client):
 
601
        clients.remove(client)
 
602
        if not clients:
 
603
            logger.debug(u"No clients left, exiting")
 
604
            main_loop.quit()
 
605
    
 
606
    clients.update(Set(Client(name=section, options=options,
 
607
                              stop_hook = remove_from_clients,
 
608
                              **(dict(client_config\
 
609
                                      .items(section))))
 
610
                       for section in client_config.sections()))
 
611
    for client in clients:
 
612
        client.start()
 
613
    
 
614
    tcp_server = IPv6_TCPServer((None, options.port),
 
615
                                tcp_handler,
 
616
                                options=options,
 
617
                                clients=clients)
 
618
    # Find out what random port we got
 
619
    servicePort = tcp_server.socket.getsockname()[1]
 
620
    logger.debug(u"Now listening on port %d", servicePort)
 
621
    
 
622
    if options.interface is not None:
 
623
        serviceInterface = if_nametoindex(options.interface)
 
624
    
 
625
    # From the Avahi server example code
 
626
    server.connect_to_signal("StateChanged", server_state_changed)
 
627
    server_state_changed(server.GetState())
 
628
    # End of Avahi example code
 
629
    
 
630
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
631
                         lambda *args, **kwargs:
 
632
                         tcp_server.handle_request(*args[2:],
 
633
                                                   **kwargs) or True)
2472
634
    try:
2473
 
        # From the Avahi example code
2474
 
        try:
2475
 
            service.activate()
2476
 
        except dbus.exceptions.DBusException as error:
2477
 
            logger.critical("DBusException: %s", error)
2478
 
            cleanup()
2479
 
            sys.exit(1)
2480
 
        # End of Avahi example code
2481
 
        
2482
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2483
 
                             lambda *args, **kwargs:
2484
 
                             (tcp_server.handle_request
2485
 
                              (*args[2:], **kwargs) or True))
2486
 
        
2487
 
        logger.debug("Starting main loop")
2488
635
        main_loop.run()
2489
 
    except AvahiError as error:
2490
 
        logger.critical("AvahiError: %s", error)
2491
 
        cleanup()
2492
 
        sys.exit(1)
2493
636
    except KeyboardInterrupt:
2494
 
        if debug:
2495
 
            print("", file=sys.stderr)
2496
 
        logger.debug("Server received KeyboardInterrupt")
2497
 
    logger.debug("Server exiting")
2498
 
    # Must run before the D-Bus bus name gets deregistered
2499
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
2500
640
 
2501
 
if __name__ == '__main__':
2502
 
    main()
 
641
    # From the Avahi server example code
 
642
    if not group is None:
 
643
        group.Free()
 
644
    # End of Avahi example code
 
645
    
 
646
    for client in clients:
 
647
        client.stop_hook = None
 
648
        client.stop()