/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2008-01-19 04:09:06 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080119040906-yjriaiqxbvzb93mq
* Makefile (client_debug): Bug fix; add quotes and / to CERT_ROOT.

* server.py (cred): Removed; no need for a global variable.

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#!/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 © 2008-2011 Teddy Hogeborn
15
 
# Copyright © 2008-2011 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
import SocketServer
38
4
import socket
39
 
import argparse
 
5
import select
 
6
from optparse import OptionParser
40
7
import datetime
41
8
import errno
42
9
import gnutls.crypto
43
10
import gnutls.connection
44
11
import gnutls.errors
45
 
import gnutls.library.functions
46
 
import gnutls.library.constants
47
 
import gnutls.library.types
48
 
import ConfigParser as configparser
 
12
import ConfigParser
49
13
import sys
50
 
import re
51
 
import os
52
 
import signal
53
 
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
 
 
69
 
import dbus
70
 
import dbus.service
71
 
import gobject
72
 
import avahi
73
 
from dbus.mainloop.glib import DBusGMainLoop
74
 
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
 
 
89
 
version = "1.4.1"
90
 
stored_state_file = "clients.pickle"
91
 
 
92
 
logger = logging.getLogger()
93
 
syslogger = (logging.handlers.SysLogHandler
94
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
95
 
              address = str("/dev/log")))
96
 
 
97
 
try:
98
 
    if_nametoindex = (ctypes.cdll.LoadLibrary
99
 
                      (ctypes.util.find_library("c"))
100
 
                      .if_nametoindex)
101
 
except (OSError, AttributeError):
102
 
    def if_nametoindex(interface):
103
 
        "Get an interface index the hard way, i.e. using fcntl()"
104
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
105
 
        with contextlib.closing(socket.socket()) as s:
106
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
107
 
                                struct.pack(str("16s16x"),
108
 
                                            interface))
109
 
        interface_index = struct.unpack(str("I"),
110
 
                                        ifreq[16:20])[0]
111
 
        return interface_index
112
 
 
113
 
 
114
 
def initlogger(level=logging.WARNING):
115
 
    """init logger and add loglevel"""
116
 
    
117
 
    syslogger.setFormatter(logging.Formatter
118
 
                           ('Mandos [%(process)d]: %(levelname)s:'
119
 
                            ' %(message)s'))
120
 
    logger.addHandler(syslogger)
121
 
    
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 CryptoError(Exception):
132
 
    pass
133
 
 
134
 
 
135
 
class Crypto(object):
136
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
137
 
    def __init__(self):
138
 
        self.gnupg = GnuPGInterface.GnuPG()
139
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
140
 
        self.gnupg = GnuPGInterface.GnuPG()
141
 
        self.gnupg.options.meta_interactive = False
142
 
        self.gnupg.options.homedir = self.tempdir
143
 
        self.gnupg.options.extra_args.extend(['--force-mdc',
144
 
                                              '--quiet'])
145
 
    
146
 
    def __enter__(self):
147
 
        return self
148
 
    
149
 
    def __exit__ (self, exc_type, exc_value, traceback):
150
 
        self._cleanup()
151
 
        return False
152
 
    
153
 
    def __del__(self):
154
 
        self._cleanup()
155
 
    
156
 
    def _cleanup(self):
157
 
        if self.tempdir is not None:
158
 
            # Delete contents of tempdir
159
 
            for root, dirs, files in os.walk(self.tempdir,
160
 
                                             topdown = False):
161
 
                for filename in files:
162
 
                    os.remove(os.path.join(root, filename))
163
 
                for dirname in dirs:
164
 
                    os.rmdir(os.path.join(root, dirname))
165
 
            # Remove tempdir
166
 
            os.rmdir(self.tempdir)
167
 
            self.tempdir = None
168
 
    
169
 
    def password_encode(self, password):
170
 
        # Passphrase can not be empty and can not contain newlines or
171
 
        # NUL bytes.  So we prefix it and hex encode it.
172
 
        return b"mandos" + binascii.hexlify(password)
173
 
    
174
 
    def encrypt(self, data, password):
175
 
        self.gnupg.passphrase = self.password_encode(password)
176
 
        with open(os.devnull) as devnull:
177
 
            try:
178
 
                proc = self.gnupg.run(['--symmetric'],
179
 
                                      create_fhs=['stdin', 'stdout'],
180
 
                                      attach_fhs={'stderr': devnull})
181
 
                with contextlib.closing(proc.handles['stdin']) as f:
182
 
                    f.write(data)
183
 
                with contextlib.closing(proc.handles['stdout']) as f:
184
 
                    ciphertext = f.read()
185
 
                proc.wait()
186
 
            except IOError as e:
187
 
                raise CryptoError(e)
188
 
        self.gnupg.passphrase = None
189
 
        return ciphertext
190
 
    
191
 
    def decrypt(self, data, password):
192
 
        self.gnupg.passphrase = self.password_encode(password)
193
 
        with open(os.devnull) as devnull:
194
 
            try:
195
 
                proc = self.gnupg.run(['--decrypt'],
196
 
                                      create_fhs=['stdin', 'stdout'],
197
 
                                      attach_fhs={'stderr': devnull})
198
 
                with contextlib.closing(proc.handles['stdin'] ) as f:
199
 
                    f.write(data)
200
 
                with contextlib.closing(proc.handles['stdout']) as f:
201
 
                    decrypted_plaintext = f.read()
202
 
                proc.wait()
203
 
            except IOError as e:
204
 
                raise CryptoError(e)
205
 
        self.gnupg.passphrase = None
206
 
        return decrypted_plaintext
207
 
 
208
 
 
209
 
 
210
 
class AvahiError(Exception):
211
 
    def __init__(self, value, *args, **kwargs):
212
 
        self.value = value
213
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
214
 
    def __unicode__(self):
215
 
        return unicode(repr(self.value))
216
 
 
217
 
class AvahiServiceError(AvahiError):
218
 
    pass
219
 
 
220
 
class AvahiGroupError(AvahiError):
221
 
    pass
222
 
 
223
 
 
224
 
class AvahiService(object):
225
 
    """An Avahi (Zeroconf) service.
226
 
    
227
 
    Attributes:
228
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
229
 
               Used to optionally bind to the specified interface.
230
 
    name: string; Example: 'Mandos'
231
 
    type: string; Example: '_mandos._tcp'.
232
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
233
 
    port: integer; what port to announce
234
 
    TXT: list of strings; TXT record for the service
235
 
    domain: string; Domain to publish on, default to .local if empty.
236
 
    host: string; Host to publish records for, default is localhost
237
 
    max_renames: integer; maximum number of renames
238
 
    rename_count: integer; counter so we only rename after collisions
239
 
                  a sensible number of times
240
 
    group: D-Bus Entry Group
241
 
    server: D-Bus Server
242
 
    bus: dbus.SystemBus()
243
 
    """
244
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
245
 
                 servicetype = None, port = None, TXT = None,
246
 
                 domain = "", host = "", max_renames = 32768,
247
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
248
 
        self.interface = interface
249
 
        self.name = name
250
 
        self.type = servicetype
251
 
        self.port = port
252
 
        self.TXT = TXT if TXT is not None else []
253
 
        self.domain = domain
254
 
        self.host = host
255
 
        self.rename_count = 0
256
 
        self.max_renames = max_renames
257
 
        self.protocol = protocol
258
 
        self.group = None       # our entry group
259
 
        self.server = None
260
 
        self.bus = bus
261
 
        self.entry_group_state_changed_match = None
262
 
    def rename(self):
263
 
        """Derived from the Avahi example code"""
264
 
        if self.rename_count >= self.max_renames:
265
 
            logger.critical("No suitable Zeroconf service name found"
266
 
                            " after %i retries, exiting.",
267
 
                            self.rename_count)
268
 
            raise AvahiServiceError("Too many renames")
269
 
        self.name = unicode(self.server
270
 
                            .GetAlternativeServiceName(self.name))
271
 
        logger.info("Changing Zeroconf service name to %r ...",
272
 
                    self.name)
273
 
        self.remove()
274
 
        try:
275
 
            self.add()
276
 
        except dbus.exceptions.DBusException as error:
277
 
            logger.critical("DBusException: %s", error)
278
 
            self.cleanup()
279
 
            os._exit(1)
280
 
        self.rename_count += 1
281
 
    def remove(self):
282
 
        """Derived from the Avahi example code"""
283
 
        if self.entry_group_state_changed_match is not None:
284
 
            self.entry_group_state_changed_match.remove()
285
 
            self.entry_group_state_changed_match = None
286
 
        if self.group is not None:
287
 
            self.group.Reset()
288
 
    def add(self):
289
 
        """Derived from the Avahi example code"""
290
 
        self.remove()
291
 
        if self.group is None:
292
 
            self.group = dbus.Interface(
293
 
                self.bus.get_object(avahi.DBUS_NAME,
294
 
                                    self.server.EntryGroupNew()),
295
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
296
 
        self.entry_group_state_changed_match = (
297
 
            self.group.connect_to_signal(
298
 
                'StateChanged', self.entry_group_state_changed))
299
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
300
 
                     self.name, self.type)
301
 
        self.group.AddService(
302
 
            self.interface,
303
 
            self.protocol,
304
 
            dbus.UInt32(0),     # flags
305
 
            self.name, self.type,
306
 
            self.domain, self.host,
307
 
            dbus.UInt16(self.port),
308
 
            avahi.string_array_to_txt_array(self.TXT))
309
 
        self.group.Commit()
310
 
    def entry_group_state_changed(self, state, error):
311
 
        """Derived from the Avahi example code"""
312
 
        logger.debug("Avahi entry group state change: %i", state)
313
 
        
314
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
315
 
            logger.debug("Zeroconf service established.")
316
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
317
 
            logger.info("Zeroconf service name collision.")
318
 
            self.rename()
319
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
320
 
            logger.critical("Avahi: Error in group state changed %s",
321
 
                            unicode(error))
322
 
            raise AvahiGroupError("State changed: %s"
323
 
                                  % unicode(error))
324
 
    def cleanup(self):
325
 
        """Derived from the Avahi example code"""
326
 
        if self.group is not None:
327
 
            try:
328
 
                self.group.Free()
329
 
            except (dbus.exceptions.UnknownMethodException,
330
 
                    dbus.exceptions.DBusException):
331
 
                pass
332
 
            self.group = None
333
 
        self.remove()
334
 
    def server_state_changed(self, state, error=None):
335
 
        """Derived from the Avahi example code"""
336
 
        logger.debug("Avahi server state change: %i", state)
337
 
        bad_states = { avahi.SERVER_INVALID:
338
 
                           "Zeroconf server invalid",
339
 
                       avahi.SERVER_REGISTERING: None,
340
 
                       avahi.SERVER_COLLISION:
341
 
                           "Zeroconf server name collision",
342
 
                       avahi.SERVER_FAILURE:
343
 
                           "Zeroconf server failure" }
344
 
        if state in bad_states:
345
 
            if bad_states[state] is not None:
346
 
                if error is None:
347
 
                    logger.error(bad_states[state])
348
 
                else:
349
 
                    logger.error(bad_states[state] + ": %r", error)
350
 
            self.cleanup()
351
 
        elif state == avahi.SERVER_RUNNING:
352
 
            self.add()
353
 
        else:
354
 
            if error is None:
355
 
                logger.debug("Unknown state: %r", state)
356
 
            else:
357
 
                logger.debug("Unknown state: %r: %r", state, error)
358
 
    def activate(self):
359
 
        """Derived from the Avahi example code"""
360
 
        if self.server is None:
361
 
            self.server = dbus.Interface(
362
 
                self.bus.get_object(avahi.DBUS_NAME,
363
 
                                    avahi.DBUS_PATH_SERVER,
364
 
                                    follow_name_owner_changes=True),
365
 
                avahi.DBUS_INTERFACE_SERVER)
366
 
        self.server.connect_to_signal("StateChanged",
367
 
                                 self.server_state_changed)
368
 
        self.server_state_changed(self.server.GetState())
369
 
 
370
 
class AvahiServiceToSyslog(AvahiService):
371
 
    def rename(self):
372
 
        """Add the new name to the syslog messages"""
373
 
        ret = AvahiService.rename(self)
374
 
        syslogger.setFormatter(logging.Formatter
375
 
                               ('Mandos (%s) [%%(process)d]:'
376
 
                                ' %%(levelname)s: %%(message)s'
377
 
                                % self.name))
378
 
        return ret
379
 
 
380
 
def _timedelta_to_milliseconds(td):
381
 
    "Convert a datetime.timedelta() to milliseconds"
382
 
    return ((td.days * 24 * 60 * 60 * 1000)
383
 
            + (td.seconds * 1000)
384
 
            + (td.microseconds // 1000))
385
 
        
 
14
 
 
15
 
386
16
class Client(object):
387
 
    """A representation of a client host served by this server.
388
 
    
389
 
    Attributes:
390
 
    _approved:   bool(); 'None' if not yet approved/disapproved
391
 
    approval_delay: datetime.timedelta(); Time to wait for approval
392
 
    approval_duration: datetime.timedelta(); Duration of one approval
393
 
    checker:    subprocess.Popen(); a running checker process used
394
 
                                    to see if the client lives.
395
 
                                    'None' if no process is running.
396
 
    checker_callback_tag: a gobject event source tag, or None
397
 
    checker_command: string; External command which is run to check
398
 
                     if client lives.  %() expansions are done at
399
 
                     runtime with vars(self) as dict, so that for
400
 
                     instance %(name)s can be used in the command.
401
 
    checker_initiator_tag: a gobject event source tag, or None
402
 
    created:    datetime.datetime(); (UTC) object creation
403
 
    client_structure: Object describing what attributes a client has
404
 
                      and is used for storing the client at exit
405
 
    current_checker_command: string; current running checker_command
406
 
    disable_initiator_tag: a gobject event source tag, or None
407
 
    enabled:    bool()
408
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
409
 
                 uniquely identify the client
410
 
    host:       string; available for use by the checker command
411
 
    interval:   datetime.timedelta(); How often to start a new checker
412
 
    last_approval_request: datetime.datetime(); (UTC) or None
413
 
    last_checked_ok: datetime.datetime(); (UTC) or None
414
 
 
415
 
    last_checker_status: integer between 0 and 255 reflecting exit
416
 
                         status of last checker. -1 reflects crashed
417
 
                         checker, or None.
418
 
    last_enabled: datetime.datetime(); (UTC)
419
 
    name:       string; from the config file, used in log messages and
420
 
                        D-Bus identifiers
421
 
    secret:     bytestring; sent verbatim (over TLS) to client
422
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
423
 
                                      until this client is disabled
424
 
    extended_timeout:   extra long timeout when password has been sent
425
 
    runtime_expansions: Allowed attributes for runtime expansion.
426
 
    expires:    datetime.datetime(); time (UTC) when a client will be
427
 
                disabled, or None
428
 
    """
429
 
    
430
 
    runtime_expansions = ("approval_delay", "approval_duration",
431
 
                          "created", "enabled", "fingerprint",
432
 
                          "host", "interval", "last_checked_ok",
433
 
                          "last_enabled", "name", "timeout")
434
 
    
435
 
    def timeout_milliseconds(self):
436
 
        "Return the 'timeout' attribute in milliseconds"
437
 
        return _timedelta_to_milliseconds(self.timeout)
438
 
    
439
 
    def extended_timeout_milliseconds(self):
440
 
        "Return the 'extended_timeout' attribute in milliseconds"
441
 
        return _timedelta_to_milliseconds(self.extended_timeout)
442
 
    
443
 
    def interval_milliseconds(self):
444
 
        "Return the 'interval' attribute in milliseconds"
445
 
        return _timedelta_to_milliseconds(self.interval)
446
 
    
447
 
    def approval_delay_milliseconds(self):
448
 
        return _timedelta_to_milliseconds(self.approval_delay)
449
 
    
450
 
    def __init__(self, name = None, config=None):
451
 
        """Note: the 'checker' key in 'config' sets the
452
 
        'checker_command' attribute and *not* the 'checker'
453
 
        attribute."""
 
17
    def __init__(self, name=None, options=None, dn=None,
 
18
                 password=None, passfile=None, fqdn=None,
 
19
                 timeout=None, interval=-1):
454
20
        self.name = name
455
 
        if config is None:
456
 
            config = {}
457
 
        logger.debug("Creating client %r", self.name)
458
 
        # Uppercase and remove spaces from fingerprint for later
459
 
        # comparison purposes with return value from the fingerprint()
460
 
        # function
461
 
        self.fingerprint = (config["fingerprint"].upper()
462
 
                            .replace(" ", ""))
463
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
464
 
        if "secret" in config:
465
 
            self.secret = config["secret"].decode("base64")
466
 
        elif "secfile" in config:
467
 
            with open(os.path.expanduser(os.path.expandvars
468
 
                                         (config["secfile"])),
469
 
                      "rb") as secfile:
470
 
                self.secret = secfile.read()
471
 
        else:
472
 
            raise TypeError("No secret or secfile for client %s"
473
 
                            % self.name)
474
 
        self.host = config.get("host", "")
475
 
        self.created = datetime.datetime.utcnow()
476
 
        self.enabled = True
477
 
        self.last_approval_request = None
478
 
        self.last_enabled = datetime.datetime.utcnow()
479
 
        self.last_checked_ok = None
480
 
        self.last_checker_status = None
481
 
        self.timeout = string_to_delta(config["timeout"])
482
 
        self.extended_timeout = string_to_delta(config
483
 
                                                ["extended_timeout"])
484
 
        self.interval = string_to_delta(config["interval"])
485
 
        self.checker = None
486
 
        self.checker_initiator_tag = None
487
 
        self.disable_initiator_tag = None
488
 
        self.expires = datetime.datetime.utcnow() + self.timeout
489
 
        self.checker_callback_tag = None
490
 
        self.checker_command = config["checker"]
491
 
        self.current_checker_command = None
492
 
        self._approved = None
493
 
        self.approved_by_default = config.get("approved_by_default",
494
 
                                              True)
495
 
        self.approvals_pending = 0
496
 
        self.approval_delay = string_to_delta(
497
 
            config["approval_delay"])
498
 
        self.approval_duration = string_to_delta(
499
 
            config["approval_duration"])
500
 
        self.changedstate = (multiprocessing_manager
501
 
                             .Condition(multiprocessing_manager
502
 
                                        .Lock()))
503
 
        self.client_structure = [attr for attr in
504
 
                                 self.__dict__.iterkeys()
505
 
                                 if not attr.startswith("_")]
506
 
        self.client_structure.append("client_structure")
507
 
        
508
 
        for name, t in inspect.getmembers(type(self),
509
 
                                          lambda obj:
510
 
                                              isinstance(obj,
511
 
                                                         property)):
512
 
            if not name.startswith("_"):
513
 
                self.client_structure.append(name)
514
 
    
515
 
    # Send notice to process children that client state has changed
516
 
    def send_changedstate(self):
517
 
        with self.changedstate:
518
 
            self.changedstate.notify_all()
519
 
    
520
 
    def enable(self):
521
 
        """Start this client's checker and timeout hooks"""
522
 
        if getattr(self, "enabled", False):
523
 
            # Already enabled
524
 
            return
525
 
        self.send_changedstate()
526
 
        self.expires = datetime.datetime.utcnow() + self.timeout
527
 
        self.enabled = True
528
 
        self.last_enabled = datetime.datetime.utcnow()
529
 
        self.init_checker()
530
 
    
531
 
    def disable(self, quiet=True):
532
 
        """Disable this client."""
533
 
        if not getattr(self, "enabled", False):
534
 
            return False
535
 
        if not quiet:
536
 
            self.send_changedstate()
537
 
        if not quiet:
538
 
            logger.info("Disabling client %s", self.name)
539
 
        if getattr(self, "disable_initiator_tag", False):
540
 
            gobject.source_remove(self.disable_initiator_tag)
541
 
            self.disable_initiator_tag = None
542
 
        self.expires = None
543
 
        if getattr(self, "checker_initiator_tag", False):
544
 
            gobject.source_remove(self.checker_initiator_tag)
545
 
            self.checker_initiator_tag = None
546
 
        self.stop_checker()
547
 
        self.enabled = False
548
 
        # Do not run this again if called by a gobject.timeout_add
549
 
        return False
550
 
    
551
 
    def __del__(self):
552
 
        self.disable()
553
 
    
554
 
    def init_checker(self):
555
 
        # Schedule a new checker to be started an 'interval' from now,
556
 
        # and every interval from then on.
557
 
        self.checker_initiator_tag = (gobject.timeout_add
558
 
                                      (self.interval_milliseconds(),
559
 
                                       self.start_checker))
560
 
        # Schedule a disable() when 'timeout' has passed
561
 
        self.disable_initiator_tag = (gobject.timeout_add
562
 
                                   (self.timeout_milliseconds(),
563
 
                                    self.disable))
564
 
        # Also start a new checker *right now*.
565
 
        self.start_checker()
566
 
    
567
 
    def checker_callback(self, pid, condition, command):
568
 
        """The checker has completed, so take appropriate actions."""
569
 
        self.checker_callback_tag = None
570
 
        self.checker = None
571
 
        if os.WIFEXITED(condition):
572
 
            self.last_checker_status =  os.WEXITSTATUS(condition)
573
 
            if self.last_checker_status == 0:
574
 
                logger.info("Checker for %(name)s succeeded",
575
 
                            vars(self))
576
 
                self.checked_ok()
577
 
            else:
578
 
                logger.info("Checker for %(name)s failed",
579
 
                            vars(self))
580
 
        else:
581
 
            self.last_checker_status = -1
582
 
            logger.warning("Checker for %(name)s crashed?",
583
 
                           vars(self))
584
 
    
585
 
    def checked_ok(self, timeout=None):
586
 
        """Bump up the timeout for this client.
587
 
        
588
 
        This should only be called when the client has been seen,
589
 
        alive and well.
590
 
        """
 
21
        self.dn = dn
 
22
        if password:
 
23
            self.password = password
 
24
        elif passfile:
 
25
            self.password = open(passfile).readall()
 
26
        else:
 
27
            print "No Password or Passfile in client config file"
 
28
            # raise RuntimeError XXX
 
29
            self.password = "gazonk"
 
30
        self.fqdn = fqdn
 
31
        self.created = datetime.datetime.now()
 
32
        self.last_seen = None
591
33
        if timeout is None:
592
 
            timeout = self.timeout
593
 
        self.last_checked_ok = datetime.datetime.utcnow()
594
 
        if self.disable_initiator_tag is not None:
595
 
            gobject.source_remove(self.disable_initiator_tag)
596
 
        if getattr(self, "enabled", False):
597
 
            self.disable_initiator_tag = (gobject.timeout_add
598
 
                                          (_timedelta_to_milliseconds
599
 
                                           (timeout), self.disable))
600
 
            self.expires = datetime.datetime.utcnow() + timeout
601
 
    
602
 
    def need_approval(self):
603
 
        self.last_approval_request = datetime.datetime.utcnow()
604
 
    
605
 
    def start_checker(self):
606
 
        """Start a new checker subprocess if one is not running.
607
 
        
608
 
        If a checker already exists, leave it running and do
609
 
        nothing."""
610
 
        # The reason for not killing a running checker is that if we
611
 
        # did that, then if a checker (for some reason) started
612
 
        # running slowly and taking more than 'interval' time, the
613
 
        # client would inevitably timeout, since no checker would get
614
 
        # a chance to run to completion.  If we instead leave running
615
 
        # checkers alone, the checker would have to take more time
616
 
        # than 'timeout' for the client to be disabled, which is as it
617
 
        # should be.
618
 
        
619
 
        # If a checker exists, make sure it is not a zombie
620
 
        try:
621
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
622
 
        except (AttributeError, OSError) as error:
623
 
            if (isinstance(error, OSError)
624
 
                and error.errno != errno.ECHILD):
625
 
                raise error
626
 
        else:
627
 
            if pid:
628
 
                logger.warning("Checker was a zombie")
629
 
                gobject.source_remove(self.checker_callback_tag)
630
 
                self.checker_callback(pid, status,
631
 
                                      self.current_checker_command)
632
 
        # Start a new checker if needed
633
 
        if self.checker is None:
634
 
            try:
635
 
                # In case checker_command has exactly one % operator
636
 
                command = self.checker_command % self.host
637
 
            except TypeError:
638
 
                # Escape attributes for the shell
639
 
                escaped_attrs = dict(
640
 
                    (attr,
641
 
                     re.escape(unicode(str(getattr(self, attr, "")),
642
 
                                       errors=
643
 
                                       'replace')))
644
 
                    for attr in
645
 
                    self.runtime_expansions)
646
 
                
647
 
                try:
648
 
                    command = self.checker_command % escaped_attrs
649
 
                except TypeError as error:
650
 
                    logger.error('Could not format string "%s":'
651
 
                                 ' %s', self.checker_command, error)
652
 
                    return True # Try again later
653
 
            self.current_checker_command = command
654
 
            try:
655
 
                logger.info("Starting checker %r for %s",
656
 
                            command, self.name)
657
 
                # We don't need to redirect stdout and stderr, since
658
 
                # in normal mode, that is already done by daemon(),
659
 
                # and in debug mode we don't want to.  (Stdin is
660
 
                # always replaced by /dev/null.)
661
 
                self.checker = subprocess.Popen(command,
662
 
                                                close_fds=True,
663
 
                                                shell=True, cwd="/")
664
 
                self.checker_callback_tag = (gobject.child_watch_add
665
 
                                             (self.checker.pid,
666
 
                                              self.checker_callback,
667
 
                                              data=command))
668
 
                # The checker may have completed before the gobject
669
 
                # watch was added.  Check for this.
670
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
671
 
                if pid:
672
 
                    gobject.source_remove(self.checker_callback_tag)
673
 
                    self.checker_callback(pid, status, command)
674
 
            except OSError as error:
675
 
                logger.error("Failed to start subprocess: %s",
676
 
                             error)
677
 
        # Re-run this periodically if run by gobject.timeout_add
678
 
        return True
679
 
    
680
 
    def stop_checker(self):
681
 
        """Force the checker process, if any, to stop."""
682
 
        if self.checker_callback_tag:
683
 
            gobject.source_remove(self.checker_callback_tag)
684
 
            self.checker_callback_tag = None
685
 
        if getattr(self, "checker", None) is None:
686
 
            return
687
 
        logger.debug("Stopping checker for %(name)s", vars(self))
688
 
        try:
689
 
            os.kill(self.checker.pid, signal.SIGTERM)
690
 
            #time.sleep(0.5)
691
 
            #if self.checker.poll() is None:
692
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
693
 
        except OSError as error:
694
 
            if error.errno != errno.ESRCH: # No such process
695
 
                raise
696
 
        self.checker = None
697
 
 
698
 
 
699
 
def dbus_service_property(dbus_interface, signature="v",
700
 
                          access="readwrite", byte_arrays=False):
701
 
    """Decorators for marking methods of a DBusObjectWithProperties to
702
 
    become properties on the D-Bus.
703
 
    
704
 
    The decorated method will be called with no arguments by "Get"
705
 
    and with one argument by "Set".
706
 
    
707
 
    The parameters, where they are supported, are the same as
708
 
    dbus.service.method, except there is only "signature", since the
709
 
    type from Get() and the type sent to Set() is the same.
710
 
    """
711
 
    # Encoding deeply encoded byte arrays is not supported yet by the
712
 
    # "Set" method, so we fail early here:
713
 
    if byte_arrays and signature != "ay":
714
 
        raise ValueError("Byte arrays not supported for non-'ay'"
715
 
                         " signature %r" % signature)
716
 
    def decorator(func):
717
 
        func._dbus_is_property = True
718
 
        func._dbus_interface = dbus_interface
719
 
        func._dbus_signature = signature
720
 
        func._dbus_access = access
721
 
        func._dbus_name = func.__name__
722
 
        if func._dbus_name.endswith("_dbus_property"):
723
 
            func._dbus_name = func._dbus_name[:-14]
724
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
725
 
        return func
726
 
    return decorator
727
 
 
728
 
 
729
 
class DBusPropertyException(dbus.exceptions.DBusException):
730
 
    """A base class for D-Bus property-related exceptions
731
 
    """
732
 
    def __unicode__(self):
733
 
        return unicode(str(self))
734
 
 
735
 
 
736
 
class DBusPropertyAccessException(DBusPropertyException):
737
 
    """A property's access permissions disallows an operation.
738
 
    """
739
 
    pass
740
 
 
741
 
 
742
 
class DBusPropertyNotFound(DBusPropertyException):
743
 
    """An attempt was made to access a non-existing property.
744
 
    """
745
 
    pass
746
 
 
747
 
 
748
 
class DBusObjectWithProperties(dbus.service.Object):
749
 
    """A D-Bus object with properties.
750
 
    
751
 
    Classes inheriting from this can use the dbus_service_property
752
 
    decorator to expose methods as D-Bus properties.  It exposes the
753
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
754
 
    """
755
 
    
756
 
    @staticmethod
757
 
    def _is_dbus_property(obj):
758
 
        return getattr(obj, "_dbus_is_property", False)
759
 
    
760
 
    def _get_all_dbus_properties(self):
761
 
        """Returns a generator of (name, attribute) pairs
762
 
        """
763
 
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
764
 
                for cls in self.__class__.__mro__
765
 
                for name, prop in
766
 
                inspect.getmembers(cls, self._is_dbus_property))
767
 
    
768
 
    def _get_dbus_property(self, interface_name, property_name):
769
 
        """Returns a bound method if one exists which is a D-Bus
770
 
        property with the specified name and interface.
771
 
        """
772
 
        for cls in  self.__class__.__mro__:
773
 
            for name, value in (inspect.getmembers
774
 
                                (cls, self._is_dbus_property)):
775
 
                if (value._dbus_name == property_name
776
 
                    and value._dbus_interface == interface_name):
777
 
                    return value.__get__(self)
778
 
        
779
 
        # No such property
780
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
781
 
                                   + interface_name + "."
782
 
                                   + property_name)
783
 
    
784
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
785
 
                         out_signature="v")
786
 
    def Get(self, interface_name, property_name):
787
 
        """Standard D-Bus property Get() method, see D-Bus standard.
788
 
        """
789
 
        prop = self._get_dbus_property(interface_name, property_name)
790
 
        if prop._dbus_access == "write":
791
 
            raise DBusPropertyAccessException(property_name)
792
 
        value = prop()
793
 
        if not hasattr(value, "variant_level"):
794
 
            return value
795
 
        return type(value)(value, variant_level=value.variant_level+1)
796
 
    
797
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
798
 
    def Set(self, interface_name, property_name, value):
799
 
        """Standard D-Bus property Set() method, see D-Bus standard.
800
 
        """
801
 
        prop = self._get_dbus_property(interface_name, property_name)
802
 
        if prop._dbus_access == "read":
803
 
            raise DBusPropertyAccessException(property_name)
804
 
        if prop._dbus_get_args_options["byte_arrays"]:
805
 
            # The byte_arrays option is not supported yet on
806
 
            # signatures other than "ay".
807
 
            if prop._dbus_signature != "ay":
808
 
                raise ValueError
809
 
            value = dbus.ByteArray(''.join(unichr(byte)
810
 
                                           for byte in value))
811
 
        prop(value)
812
 
    
813
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
814
 
                         out_signature="a{sv}")
815
 
    def GetAll(self, interface_name):
816
 
        """Standard D-Bus property GetAll() method, see D-Bus
817
 
        standard.
818
 
        
819
 
        Note: Will not include properties with access="write".
820
 
        """
821
 
        properties = {}
822
 
        for name, prop in self._get_all_dbus_properties():
823
 
            if (interface_name
824
 
                and interface_name != prop._dbus_interface):
825
 
                # Interface non-empty but did not match
826
 
                continue
827
 
            # Ignore write-only properties
828
 
            if prop._dbus_access == "write":
829
 
                continue
830
 
            value = prop()
831
 
            if not hasattr(value, "variant_level"):
832
 
                properties[name] = value
833
 
                continue
834
 
            properties[name] = type(value)(value, variant_level=
835
 
                                           value.variant_level+1)
836
 
        return dbus.Dictionary(properties, signature="sv")
837
 
    
838
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
839
 
                         out_signature="s",
840
 
                         path_keyword='object_path',
841
 
                         connection_keyword='connection')
842
 
    def Introspect(self, object_path, connection):
843
 
        """Standard D-Bus method, overloaded to insert property tags.
844
 
        """
845
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
846
 
                                                   connection)
847
 
        try:
848
 
            document = xml.dom.minidom.parseString(xmlstring)
849
 
            def make_tag(document, name, prop):
850
 
                e = document.createElement("property")
851
 
                e.setAttribute("name", name)
852
 
                e.setAttribute("type", prop._dbus_signature)
853
 
                e.setAttribute("access", prop._dbus_access)
854
 
                return e
855
 
            for if_tag in document.getElementsByTagName("interface"):
856
 
                for tag in (make_tag(document, name, prop)
857
 
                            for name, prop
858
 
                            in self._get_all_dbus_properties()
859
 
                            if prop._dbus_interface
860
 
                            == if_tag.getAttribute("name")):
861
 
                    if_tag.appendChild(tag)
862
 
                # Add the names to the return values for the
863
 
                # "org.freedesktop.DBus.Properties" methods
864
 
                if (if_tag.getAttribute("name")
865
 
                    == "org.freedesktop.DBus.Properties"):
866
 
                    for cn in if_tag.getElementsByTagName("method"):
867
 
                        if cn.getAttribute("name") == "Get":
868
 
                            for arg in cn.getElementsByTagName("arg"):
869
 
                                if (arg.getAttribute("direction")
870
 
                                    == "out"):
871
 
                                    arg.setAttribute("name", "value")
872
 
                        elif cn.getAttribute("name") == "GetAll":
873
 
                            for arg in cn.getElementsByTagName("arg"):
874
 
                                if (arg.getAttribute("direction")
875
 
                                    == "out"):
876
 
                                    arg.setAttribute("name", "props")
877
 
            xmlstring = document.toxml("utf-8")
878
 
            document.unlink()
879
 
        except (AttributeError, xml.dom.DOMException,
880
 
                xml.parsers.expat.ExpatError) as error:
881
 
            logger.error("Failed to override Introspection method",
882
 
                         error)
883
 
        return xmlstring
884
 
 
885
 
 
886
 
def datetime_to_dbus (dt, variant_level=0):
887
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
888
 
    if dt is None:
889
 
        return dbus.String("", variant_level = variant_level)
890
 
    return dbus.String(dt.isoformat(),
891
 
                       variant_level=variant_level)
892
 
 
893
 
 
894
 
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
895
 
                                  .__metaclass__):
896
 
    """Applied to an empty subclass of a D-Bus object, this metaclass
897
 
    will add additional D-Bus attributes matching a certain pattern.
898
 
    """
899
 
    def __new__(mcs, name, bases, attr):
900
 
        # Go through all the base classes which could have D-Bus
901
 
        # methods, signals, or properties in them
902
 
        for base in (b for b in bases
903
 
                     if issubclass(b, dbus.service.Object)):
904
 
            # Go though all attributes of the base class
905
 
            for attrname, attribute in inspect.getmembers(base):
906
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
907
 
                # with the wrong interface name
908
 
                if (not hasattr(attribute, "_dbus_interface")
909
 
                    or not attribute._dbus_interface
910
 
                    .startswith("se.recompile.Mandos")):
911
 
                    continue
912
 
                # Create an alternate D-Bus interface name based on
913
 
                # the current name
914
 
                alt_interface = (attribute._dbus_interface
915
 
                                 .replace("se.recompile.Mandos",
916
 
                                          "se.bsnet.fukt.Mandos"))
917
 
                # Is this a D-Bus signal?
918
 
                if getattr(attribute, "_dbus_is_signal", False):
919
 
                    # Extract the original non-method function by
920
 
                    # black magic
921
 
                    nonmethod_func = (dict(
922
 
                            zip(attribute.func_code.co_freevars,
923
 
                                attribute.__closure__))["func"]
924
 
                                      .cell_contents)
925
 
                    # Create a new, but exactly alike, function
926
 
                    # object, and decorate it to be a new D-Bus signal
927
 
                    # with the alternate D-Bus interface name
928
 
                    new_function = (dbus.service.signal
929
 
                                    (alt_interface,
930
 
                                     attribute._dbus_signature)
931
 
                                    (types.FunctionType(
932
 
                                nonmethod_func.func_code,
933
 
                                nonmethod_func.func_globals,
934
 
                                nonmethod_func.func_name,
935
 
                                nonmethod_func.func_defaults,
936
 
                                nonmethod_func.func_closure)))
937
 
                    # Define a creator of a function to call both the
938
 
                    # old and new functions, so both the old and new
939
 
                    # signals gets sent when the function is called
940
 
                    def fixscope(func1, func2):
941
 
                        """This function is a scope container to pass
942
 
                        func1 and func2 to the "call_both" function
943
 
                        outside of its arguments"""
944
 
                        def call_both(*args, **kwargs):
945
 
                            """This function will emit two D-Bus
946
 
                            signals by calling func1 and func2"""
947
 
                            func1(*args, **kwargs)
948
 
                            func2(*args, **kwargs)
949
 
                        return call_both
950
 
                    # Create the "call_both" function and add it to
951
 
                    # the class
952
 
                    attr[attrname] = fixscope(attribute,
953
 
                                              new_function)
954
 
                # Is this a D-Bus method?
955
 
                elif getattr(attribute, "_dbus_is_method", False):
956
 
                    # Create a new, but exactly alike, function
957
 
                    # object.  Decorate it to be a new D-Bus method
958
 
                    # with the alternate D-Bus interface name.  Add it
959
 
                    # to the class.
960
 
                    attr[attrname] = (dbus.service.method
961
 
                                      (alt_interface,
962
 
                                       attribute._dbus_in_signature,
963
 
                                       attribute._dbus_out_signature)
964
 
                                      (types.FunctionType
965
 
                                       (attribute.func_code,
966
 
                                        attribute.func_globals,
967
 
                                        attribute.func_name,
968
 
                                        attribute.func_defaults,
969
 
                                        attribute.func_closure)))
970
 
                # Is this a D-Bus property?
971
 
                elif getattr(attribute, "_dbus_is_property", False):
972
 
                    # Create a new, but exactly alike, function
973
 
                    # object, and decorate it to be a new D-Bus
974
 
                    # property with the alternate D-Bus interface
975
 
                    # name.  Add it to the class.
976
 
                    attr[attrname] = (dbus_service_property
977
 
                                      (alt_interface,
978
 
                                       attribute._dbus_signature,
979
 
                                       attribute._dbus_access,
980
 
                                       attribute
981
 
                                       ._dbus_get_args_options
982
 
                                       ["byte_arrays"])
983
 
                                      (types.FunctionType
984
 
                                       (attribute.func_code,
985
 
                                        attribute.func_globals,
986
 
                                        attribute.func_name,
987
 
                                        attribute.func_defaults,
988
 
                                        attribute.func_closure)))
989
 
        return type.__new__(mcs, name, bases, attr)
990
 
 
991
 
 
992
 
class ClientDBus(Client, DBusObjectWithProperties):
993
 
    """A Client class using D-Bus
994
 
    
995
 
    Attributes:
996
 
    dbus_object_path: dbus.ObjectPath
997
 
    bus: dbus.SystemBus()
998
 
    """
999
 
    
1000
 
    runtime_expansions = (Client.runtime_expansions
1001
 
                          + ("dbus_object_path",))
1002
 
    
1003
 
    # dbus.service.Object doesn't use super(), so we can't either.
1004
 
    
1005
 
    def __init__(self, bus = None, *args, **kwargs):
1006
 
        self.bus = bus
1007
 
        Client.__init__(self, *args, **kwargs)
1008
 
        
1009
 
        self._approvals_pending = 0
1010
 
        # Only now, when this client is initialized, can it show up on
1011
 
        # the D-Bus
1012
 
        client_object_name = unicode(self.name).translate(
1013
 
            {ord("."): ord("_"),
1014
 
             ord("-"): ord("_")})
1015
 
        self.dbus_object_path = (dbus.ObjectPath
1016
 
                                 ("/clients/" + client_object_name))
1017
 
        DBusObjectWithProperties.__init__(self, self.bus,
1018
 
                                          self.dbus_object_path)
1019
 
        
1020
 
    def notifychangeproperty(transform_func,
1021
 
                             dbus_name, type_func=lambda x: x,
1022
 
                             variant_level=1):
1023
 
        """ Modify a variable so that it's a property which announces
1024
 
        its changes to DBus.
1025
 
        
1026
 
        transform_fun: Function that takes a value and a variant_level
1027
 
                       and transforms it to a D-Bus type.
1028
 
        dbus_name: D-Bus name of the variable
1029
 
        type_func: Function that transform the value before sending it
1030
 
                   to the D-Bus.  Default: no transform
1031
 
        variant_level: D-Bus variant level.  Default: 1
1032
 
        """
1033
 
        attrname = "_{0}".format(dbus_name)
1034
 
        def setter(self, value):
1035
 
            if hasattr(self, "dbus_object_path"):
1036
 
                if (not hasattr(self, attrname) or
1037
 
                    type_func(getattr(self, attrname, None))
1038
 
                    != type_func(value)):
1039
 
                    dbus_value = transform_func(type_func(value),
1040
 
                                                variant_level
1041
 
                                                =variant_level)
1042
 
                    self.PropertyChanged(dbus.String(dbus_name),
1043
 
                                         dbus_value)
1044
 
            setattr(self, attrname, value)
1045
 
        
1046
 
        return property(lambda self: getattr(self, attrname), setter)
1047
 
    
1048
 
    
1049
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1050
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1051
 
                                             "ApprovalPending",
1052
 
                                             type_func = bool)
1053
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1054
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1055
 
                                        "LastEnabled")
1056
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1057
 
                                   type_func = lambda checker:
1058
 
                                       checker is not None)
1059
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1060
 
                                           "LastCheckedOK")
1061
 
    last_approval_request = notifychangeproperty(
1062
 
        datetime_to_dbus, "LastApprovalRequest")
1063
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1064
 
                                               "ApprovedByDefault")
1065
 
    approval_delay = notifychangeproperty(dbus.UInt16,
1066
 
                                          "ApprovalDelay",
1067
 
                                          type_func =
1068
 
                                          _timedelta_to_milliseconds)
1069
 
    approval_duration = notifychangeproperty(
1070
 
        dbus.UInt16, "ApprovalDuration",
1071
 
        type_func = _timedelta_to_milliseconds)
1072
 
    host = notifychangeproperty(dbus.String, "Host")
1073
 
    timeout = notifychangeproperty(dbus.UInt16, "Timeout",
1074
 
                                   type_func =
1075
 
                                   _timedelta_to_milliseconds)
1076
 
    extended_timeout = notifychangeproperty(
1077
 
        dbus.UInt16, "ExtendedTimeout",
1078
 
        type_func = _timedelta_to_milliseconds)
1079
 
    interval = notifychangeproperty(dbus.UInt16,
1080
 
                                    "Interval",
1081
 
                                    type_func =
1082
 
                                    _timedelta_to_milliseconds)
1083
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1084
 
    
1085
 
    del notifychangeproperty
1086
 
    
1087
 
    def __del__(self, *args, **kwargs):
1088
 
        try:
1089
 
            self.remove_from_connection()
1090
 
        except LookupError:
1091
 
            pass
1092
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1093
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1094
 
        Client.__del__(self, *args, **kwargs)
1095
 
    
1096
 
    def checker_callback(self, pid, condition, command,
1097
 
                         *args, **kwargs):
1098
 
        self.checker_callback_tag = None
1099
 
        self.checker = None
1100
 
        if os.WIFEXITED(condition):
1101
 
            exitstatus = os.WEXITSTATUS(condition)
1102
 
            # Emit D-Bus signal
1103
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1104
 
                                  dbus.Int64(condition),
1105
 
                                  dbus.String(command))
1106
 
        else:
1107
 
            # Emit D-Bus signal
1108
 
            self.CheckerCompleted(dbus.Int16(-1),
1109
 
                                  dbus.Int64(condition),
1110
 
                                  dbus.String(command))
1111
 
        
1112
 
        return Client.checker_callback(self, pid, condition, command,
1113
 
                                       *args, **kwargs)
1114
 
    
1115
 
    def start_checker(self, *args, **kwargs):
1116
 
        old_checker = self.checker
1117
 
        if self.checker is not None:
1118
 
            old_checker_pid = self.checker.pid
1119
 
        else:
1120
 
            old_checker_pid = None
1121
 
        r = Client.start_checker(self, *args, **kwargs)
1122
 
        # Only if new checker process was started
1123
 
        if (self.checker is not None
1124
 
            and old_checker_pid != self.checker.pid):
1125
 
            # Emit D-Bus signal
1126
 
            self.CheckerStarted(self.current_checker_command)
1127
 
        return r
1128
 
    
1129
 
    def _reset_approved(self):
1130
 
        self._approved = None
1131
 
        return False
1132
 
    
1133
 
    def approve(self, value=True):
1134
 
        self.send_changedstate()
1135
 
        self._approved = value
1136
 
        gobject.timeout_add(_timedelta_to_milliseconds
1137
 
                            (self.approval_duration),
1138
 
                            self._reset_approved)
1139
 
    
1140
 
    
1141
 
    ## D-Bus methods, signals & properties
1142
 
    _interface = "se.recompile.Mandos.Client"
1143
 
    
1144
 
    ## Signals
1145
 
    
1146
 
    # CheckerCompleted - signal
1147
 
    @dbus.service.signal(_interface, signature="nxs")
1148
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1149
 
        "D-Bus signal"
1150
 
        pass
1151
 
    
1152
 
    # CheckerStarted - signal
1153
 
    @dbus.service.signal(_interface, signature="s")
1154
 
    def CheckerStarted(self, command):
1155
 
        "D-Bus signal"
1156
 
        pass
1157
 
    
1158
 
    # PropertyChanged - signal
1159
 
    @dbus.service.signal(_interface, signature="sv")
1160
 
    def PropertyChanged(self, property, value):
1161
 
        "D-Bus signal"
1162
 
        pass
1163
 
    
1164
 
    # GotSecret - signal
1165
 
    @dbus.service.signal(_interface)
1166
 
    def GotSecret(self):
1167
 
        """D-Bus signal
1168
 
        Is sent after a successful transfer of secret from the Mandos
1169
 
        server to mandos-client
1170
 
        """
1171
 
        pass
1172
 
    
1173
 
    # Rejected - signal
1174
 
    @dbus.service.signal(_interface, signature="s")
1175
 
    def Rejected(self, reason):
1176
 
        "D-Bus signal"
1177
 
        pass
1178
 
    
1179
 
    # NeedApproval - signal
1180
 
    @dbus.service.signal(_interface, signature="tb")
1181
 
    def NeedApproval(self, timeout, default):
1182
 
        "D-Bus signal"
1183
 
        return self.need_approval()
1184
 
    
1185
 
    # NeRwequest - signal
1186
 
    @dbus.service.signal(_interface, signature="s")
1187
 
    def NewRequest(self, ip):
1188
 
        """D-Bus signal
1189
 
        Is sent after a client request a password.
1190
 
        """
1191
 
        pass
1192
 
    
1193
 
    ## Methods
1194
 
    
1195
 
    # Approve - method
1196
 
    @dbus.service.method(_interface, in_signature="b")
1197
 
    def Approve(self, value):
1198
 
        self.approve(value)
1199
 
    
1200
 
    # CheckedOK - method
1201
 
    @dbus.service.method(_interface)
1202
 
    def CheckedOK(self):
1203
 
        self.checked_ok()
1204
 
    
1205
 
    # Enable - method
1206
 
    @dbus.service.method(_interface)
1207
 
    def Enable(self):
1208
 
        "D-Bus method"
1209
 
        self.enable()
1210
 
    
1211
 
    # StartChecker - method
1212
 
    @dbus.service.method(_interface)
1213
 
    def StartChecker(self):
1214
 
        "D-Bus method"
1215
 
        self.start_checker()
1216
 
    
1217
 
    # Disable - method
1218
 
    @dbus.service.method(_interface)
1219
 
    def Disable(self):
1220
 
        "D-Bus method"
1221
 
        self.disable()
1222
 
    
1223
 
    # StopChecker - method
1224
 
    @dbus.service.method(_interface)
1225
 
    def StopChecker(self):
1226
 
        self.stop_checker()
1227
 
    
1228
 
    ## Properties
1229
 
    
1230
 
    # ApprovalPending - property
1231
 
    @dbus_service_property(_interface, signature="b", access="read")
1232
 
    def ApprovalPending_dbus_property(self):
1233
 
        return dbus.Boolean(bool(self.approvals_pending))
1234
 
    
1235
 
    # ApprovedByDefault - property
1236
 
    @dbus_service_property(_interface, signature="b",
1237
 
                           access="readwrite")
1238
 
    def ApprovedByDefault_dbus_property(self, value=None):
1239
 
        if value is None:       # get
1240
 
            return dbus.Boolean(self.approved_by_default)
1241
 
        self.approved_by_default = bool(value)
1242
 
    
1243
 
    # ApprovalDelay - property
1244
 
    @dbus_service_property(_interface, signature="t",
1245
 
                           access="readwrite")
1246
 
    def ApprovalDelay_dbus_property(self, value=None):
1247
 
        if value is None:       # get
1248
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1249
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1250
 
    
1251
 
    # ApprovalDuration - property
1252
 
    @dbus_service_property(_interface, signature="t",
1253
 
                           access="readwrite")
1254
 
    def ApprovalDuration_dbus_property(self, value=None):
1255
 
        if value is None:       # get
1256
 
            return dbus.UInt64(_timedelta_to_milliseconds(
1257
 
                    self.approval_duration))
1258
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1259
 
    
1260
 
    # Name - property
1261
 
    @dbus_service_property(_interface, signature="s", access="read")
1262
 
    def Name_dbus_property(self):
1263
 
        return dbus.String(self.name)
1264
 
    
1265
 
    # Fingerprint - property
1266
 
    @dbus_service_property(_interface, signature="s", access="read")
1267
 
    def Fingerprint_dbus_property(self):
1268
 
        return dbus.String(self.fingerprint)
1269
 
    
1270
 
    # Host - property
1271
 
    @dbus_service_property(_interface, signature="s",
1272
 
                           access="readwrite")
1273
 
    def Host_dbus_property(self, value=None):
1274
 
        if value is None:       # get
1275
 
            return dbus.String(self.host)
1276
 
        self.host = value
1277
 
    
1278
 
    # Created - property
1279
 
    @dbus_service_property(_interface, signature="s", access="read")
1280
 
    def Created_dbus_property(self):
1281
 
        return dbus.String(datetime_to_dbus(self.created))
1282
 
    
1283
 
    # LastEnabled - property
1284
 
    @dbus_service_property(_interface, signature="s", access="read")
1285
 
    def LastEnabled_dbus_property(self):
1286
 
        return datetime_to_dbus(self.last_enabled)
1287
 
    
1288
 
    # Enabled - property
1289
 
    @dbus_service_property(_interface, signature="b",
1290
 
                           access="readwrite")
1291
 
    def Enabled_dbus_property(self, value=None):
1292
 
        if value is None:       # get
1293
 
            return dbus.Boolean(self.enabled)
1294
 
        if value:
1295
 
            self.enable()
1296
 
        else:
1297
 
            self.disable()
1298
 
    
1299
 
    # LastCheckedOK - property
1300
 
    @dbus_service_property(_interface, signature="s",
1301
 
                           access="readwrite")
1302
 
    def LastCheckedOK_dbus_property(self, value=None):
1303
 
        if value is not None:
1304
 
            self.checked_ok()
1305
 
            return
1306
 
        return datetime_to_dbus(self.last_checked_ok)
1307
 
    
1308
 
    # Expires - property
1309
 
    @dbus_service_property(_interface, signature="s", access="read")
1310
 
    def Expires_dbus_property(self):
1311
 
        return datetime_to_dbus(self.expires)
1312
 
    
1313
 
    # LastApprovalRequest - property
1314
 
    @dbus_service_property(_interface, signature="s", access="read")
1315
 
    def LastApprovalRequest_dbus_property(self):
1316
 
        return datetime_to_dbus(self.last_approval_request)
1317
 
    
1318
 
    # Timeout - property
1319
 
    @dbus_service_property(_interface, signature="t",
1320
 
                           access="readwrite")
1321
 
    def Timeout_dbus_property(self, value=None):
1322
 
        if value is None:       # get
1323
 
            return dbus.UInt64(self.timeout_milliseconds())
1324
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1325
 
        if getattr(self, "disable_initiator_tag", None) is None:
1326
 
            return
1327
 
        # Reschedule timeout
1328
 
        gobject.source_remove(self.disable_initiator_tag)
1329
 
        self.disable_initiator_tag = None
1330
 
        self.expires = None
1331
 
        time_to_die = _timedelta_to_milliseconds((self
1332
 
                                                  .last_checked_ok
1333
 
                                                  + self.timeout)
1334
 
                                                 - datetime.datetime
1335
 
                                                 .utcnow())
1336
 
        if time_to_die <= 0:
1337
 
            # The timeout has passed
1338
 
            self.disable()
1339
 
        else:
1340
 
            self.expires = (datetime.datetime.utcnow()
1341
 
                            + datetime.timedelta(milliseconds =
1342
 
                                                 time_to_die))
1343
 
            self.disable_initiator_tag = (gobject.timeout_add
1344
 
                                          (time_to_die, self.disable))
1345
 
    
1346
 
    # ExtendedTimeout - property
1347
 
    @dbus_service_property(_interface, signature="t",
1348
 
                           access="readwrite")
1349
 
    def ExtendedTimeout_dbus_property(self, value=None):
1350
 
        if value is None:       # get
1351
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1352
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1353
 
    
1354
 
    # Interval - property
1355
 
    @dbus_service_property(_interface, signature="t",
1356
 
                           access="readwrite")
1357
 
    def Interval_dbus_property(self, value=None):
1358
 
        if value is None:       # get
1359
 
            return dbus.UInt64(self.interval_milliseconds())
1360
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1361
 
        if getattr(self, "checker_initiator_tag", None) is None:
1362
 
            return
1363
 
        # Reschedule checker run
1364
 
        gobject.source_remove(self.checker_initiator_tag)
1365
 
        self.checker_initiator_tag = (gobject.timeout_add
1366
 
                                      (value, self.start_checker))
1367
 
        self.start_checker()    # Start one now, too
1368
 
    
1369
 
    # Checker - property
1370
 
    @dbus_service_property(_interface, signature="s",
1371
 
                           access="readwrite")
1372
 
    def Checker_dbus_property(self, value=None):
1373
 
        if value is None:       # get
1374
 
            return dbus.String(self.checker_command)
1375
 
        self.checker_command = value
1376
 
    
1377
 
    # CheckerRunning - property
1378
 
    @dbus_service_property(_interface, signature="b",
1379
 
                           access="readwrite")
1380
 
    def CheckerRunning_dbus_property(self, value=None):
1381
 
        if value is None:       # get
1382
 
            return dbus.Boolean(self.checker is not None)
1383
 
        if value:
1384
 
            self.start_checker()
1385
 
        else:
1386
 
            self.stop_checker()
1387
 
    
1388
 
    # ObjectPath - property
1389
 
    @dbus_service_property(_interface, signature="o", access="read")
1390
 
    def ObjectPath_dbus_property(self):
1391
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1392
 
    
1393
 
    # Secret = property
1394
 
    @dbus_service_property(_interface, signature="ay",
1395
 
                           access="write", byte_arrays=True)
1396
 
    def Secret_dbus_property(self, value):
1397
 
        self.secret = str(value)
1398
 
    
1399
 
    del _interface
1400
 
 
1401
 
 
1402
 
class ProxyClient(object):
1403
 
    def __init__(self, child_pipe, fpr, address):
1404
 
        self._pipe = child_pipe
1405
 
        self._pipe.send(('init', fpr, address))
1406
 
        if not self._pipe.recv():
1407
 
            raise KeyError()
1408
 
    
1409
 
    def __getattribute__(self, name):
1410
 
        if(name == '_pipe'):
1411
 
            return super(ProxyClient, self).__getattribute__(name)
1412
 
        self._pipe.send(('getattr', name))
1413
 
        data = self._pipe.recv()
1414
 
        if data[0] == 'data':
1415
 
            return data[1]
1416
 
        if data[0] == 'function':
1417
 
            def func(*args, **kwargs):
1418
 
                self._pipe.send(('funcall', name, args, kwargs))
1419
 
                return self._pipe.recv()[1]
1420
 
            return func
1421
 
    
1422
 
    def __setattr__(self, name, value):
1423
 
        if(name == '_pipe'):
1424
 
            return super(ProxyClient, self).__setattr__(name, value)
1425
 
        self._pipe.send(('setattr', name, value))
1426
 
 
1427
 
 
1428
 
class ClientDBusTransitional(ClientDBus):
1429
 
    __metaclass__ = AlternateDBusNamesMetaclass
1430
 
 
1431
 
 
1432
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1433
 
    """A class to handle client connections.
1434
 
    
1435
 
    Instantiated once for each connection to handle it.
1436
 
    Note: This will run in its own forked process."""
1437
 
    
1438
 
    def handle(self):
1439
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1440
 
            logger.info("TCP connection from: %s",
1441
 
                        unicode(self.client_address))
1442
 
            logger.debug("Pipe FD: %d",
1443
 
                         self.server.child_pipe.fileno())
1444
 
            
1445
 
            session = (gnutls.connection
1446
 
                       .ClientSession(self.request,
1447
 
                                      gnutls.connection
1448
 
                                      .X509Credentials()))
1449
 
            
1450
 
            # Note: gnutls.connection.X509Credentials is really a
1451
 
            # generic GnuTLS certificate credentials object so long as
1452
 
            # no X.509 keys are added to it.  Therefore, we can use it
1453
 
            # here despite using OpenPGP certificates.
1454
 
            
1455
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1456
 
            #                      "+AES-256-CBC", "+SHA1",
1457
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1458
 
            #                      "+DHE-DSS"))
1459
 
            # Use a fallback default, since this MUST be set.
1460
 
            priority = self.server.gnutls_priority
1461
 
            if priority is None:
1462
 
                priority = "NORMAL"
1463
 
            (gnutls.library.functions
1464
 
             .gnutls_priority_set_direct(session._c_object,
1465
 
                                         priority, None))
1466
 
            
1467
 
            # Start communication using the Mandos protocol
1468
 
            # Get protocol number
1469
 
            line = self.request.makefile().readline()
1470
 
            logger.debug("Protocol version: %r", line)
1471
 
            try:
1472
 
                if int(line.strip().split()[0]) > 1:
1473
 
                    raise RuntimeError
1474
 
            except (ValueError, IndexError, RuntimeError) as error:
1475
 
                logger.error("Unknown protocol version: %s", error)
1476
 
                return
1477
 
            
1478
 
            # Start GnuTLS connection
1479
 
            try:
1480
 
                session.handshake()
1481
 
            except gnutls.errors.GNUTLSError as error:
1482
 
                logger.warning("Handshake failed: %s", error)
1483
 
                # Do not run session.bye() here: the session is not
1484
 
                # established.  Just abandon the request.
1485
 
                return
1486
 
            logger.debug("Handshake succeeded")
1487
 
            
1488
 
            approval_required = False
1489
 
            try:
1490
 
                try:
1491
 
                    fpr = self.fingerprint(self.peer_certificate
1492
 
                                           (session))
1493
 
                except (TypeError,
1494
 
                        gnutls.errors.GNUTLSError) as error:
1495
 
                    logger.warning("Bad certificate: %s", error)
1496
 
                    return
1497
 
                logger.debug("Fingerprint: %s", fpr)
1498
 
                if self.server.use_dbus:
1499
 
                    # Emit D-Bus signal
1500
 
                    client.NewRequest(str(self.client_address))
1501
 
                
1502
 
                try:
1503
 
                    client = ProxyClient(child_pipe, fpr,
1504
 
                                         self.client_address)
1505
 
                except KeyError:
1506
 
                    return
1507
 
                
1508
 
                if client.approval_delay:
1509
 
                    delay = client.approval_delay
1510
 
                    client.approvals_pending += 1
1511
 
                    approval_required = True
1512
 
                
1513
 
                while True:
1514
 
                    if not client.enabled:
1515
 
                        logger.info("Client %s is disabled",
1516
 
                                       client.name)
1517
 
                        if self.server.use_dbus:
1518
 
                            # Emit D-Bus signal
1519
 
                            client.Rejected("Disabled")
1520
 
                        return
1521
 
                    
1522
 
                    if client._approved or not client.approval_delay:
1523
 
                        #We are approved or approval is disabled
1524
 
                        break
1525
 
                    elif client._approved is None:
1526
 
                        logger.info("Client %s needs approval",
1527
 
                                    client.name)
1528
 
                        if self.server.use_dbus:
1529
 
                            # Emit D-Bus signal
1530
 
                            client.NeedApproval(
1531
 
                                client.approval_delay_milliseconds(),
1532
 
                                client.approved_by_default)
1533
 
                    else:
1534
 
                        logger.warning("Client %s was not approved",
1535
 
                                       client.name)
1536
 
                        if self.server.use_dbus:
1537
 
                            # Emit D-Bus signal
1538
 
                            client.Rejected("Denied")
1539
 
                        return
1540
 
                    
1541
 
                    #wait until timeout or approved
1542
 
                    time = datetime.datetime.now()
1543
 
                    client.changedstate.acquire()
1544
 
                    (client.changedstate.wait
1545
 
                     (float(client._timedelta_to_milliseconds(delay)
1546
 
                            / 1000)))
1547
 
                    client.changedstate.release()
1548
 
                    time2 = datetime.datetime.now()
1549
 
                    if (time2 - time) >= delay:
1550
 
                        if not client.approved_by_default:
1551
 
                            logger.warning("Client %s timed out while"
1552
 
                                           " waiting for approval",
1553
 
                                           client.name)
1554
 
                            if self.server.use_dbus:
1555
 
                                # Emit D-Bus signal
1556
 
                                client.Rejected("Approval timed out")
1557
 
                            return
1558
 
                        else:
1559
 
                            break
1560
 
                    else:
1561
 
                        delay -= time2 - time
1562
 
                
1563
 
                sent_size = 0
1564
 
                while sent_size < len(client.secret):
1565
 
                    try:
1566
 
                        sent = session.send(client.secret[sent_size:])
1567
 
                    except gnutls.errors.GNUTLSError as error:
1568
 
                        logger.warning("gnutls send failed")
1569
 
                        return
1570
 
                    logger.debug("Sent: %d, remaining: %d",
1571
 
                                 sent, len(client.secret)
1572
 
                                 - (sent_size + sent))
1573
 
                    sent_size += sent
1574
 
                
1575
 
                logger.info("Sending secret to %s", client.name)
1576
 
                # bump the timeout using extended_timeout
1577
 
                client.checked_ok(client.extended_timeout)
1578
 
                if self.server.use_dbus:
1579
 
                    # Emit D-Bus signal
1580
 
                    client.GotSecret()
1581
 
            
1582
 
            finally:
1583
 
                if approval_required:
1584
 
                    client.approvals_pending -= 1
1585
 
                try:
1586
 
                    session.bye()
1587
 
                except gnutls.errors.GNUTLSError as error:
1588
 
                    logger.warning("GnuTLS bye failed")
1589
 
    
1590
 
    @staticmethod
1591
 
    def peer_certificate(session):
1592
 
        "Return the peer's OpenPGP certificate as a bytestring"
1593
 
        # If not an OpenPGP certificate...
1594
 
        if (gnutls.library.functions
1595
 
            .gnutls_certificate_type_get(session._c_object)
1596
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1597
 
            # ...do the normal thing
1598
 
            return session.peer_certificate
1599
 
        list_size = ctypes.c_uint(1)
1600
 
        cert_list = (gnutls.library.functions
1601
 
                     .gnutls_certificate_get_peers
1602
 
                     (session._c_object, ctypes.byref(list_size)))
1603
 
        if not bool(cert_list) and list_size.value != 0:
1604
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1605
 
                                            " certificate")
1606
 
        if list_size.value == 0:
1607
 
            return None
1608
 
        cert = cert_list[0]
1609
 
        return ctypes.string_at(cert.data, cert.size)
1610
 
    
1611
 
    @staticmethod
1612
 
    def fingerprint(openpgp):
1613
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1614
 
        # New GnuTLS "datum" with the OpenPGP public key
1615
 
        datum = (gnutls.library.types
1616
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1617
 
                                             ctypes.POINTER
1618
 
                                             (ctypes.c_ubyte)),
1619
 
                                 ctypes.c_uint(len(openpgp))))
1620
 
        # New empty GnuTLS certificate
1621
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1622
 
        (gnutls.library.functions
1623
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1624
 
        # Import the OpenPGP public key into the certificate
1625
 
        (gnutls.library.functions
1626
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1627
 
                                    gnutls.library.constants
1628
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1629
 
        # Verify the self signature in the key
1630
 
        crtverify = ctypes.c_uint()
1631
 
        (gnutls.library.functions
1632
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1633
 
                                         ctypes.byref(crtverify)))
1634
 
        if crtverify.value != 0:
1635
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1636
 
            raise (gnutls.errors.CertificateSecurityError
1637
 
                   ("Verify failed"))
1638
 
        # New buffer for the fingerprint
1639
 
        buf = ctypes.create_string_buffer(20)
1640
 
        buf_len = ctypes.c_size_t()
1641
 
        # Get the fingerprint from the certificate into the buffer
1642
 
        (gnutls.library.functions
1643
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1644
 
                                             ctypes.byref(buf_len)))
1645
 
        # Deinit the certificate
1646
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1647
 
        # Convert the buffer to a Python bytestring
1648
 
        fpr = ctypes.string_at(buf, buf_len.value)
1649
 
        # Convert the bytestring to hexadecimal notation
1650
 
        hex_fpr = binascii.hexlify(fpr).upper()
1651
 
        return hex_fpr
1652
 
 
1653
 
 
1654
 
class MultiprocessingMixIn(object):
1655
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1656
 
    def sub_process_main(self, request, address):
1657
 
        try:
1658
 
            self.finish_request(request, address)
1659
 
        except:
1660
 
            self.handle_error(request, address)
1661
 
        self.close_request(request)
1662
 
    
1663
 
    def process_request(self, request, address):
1664
 
        """Start a new process to process the request."""
1665
 
        proc = multiprocessing.Process(target = self.sub_process_main,
1666
 
                                       args = (request,
1667
 
                                               address))
1668
 
        proc.start()
1669
 
        return proc
1670
 
 
1671
 
 
1672
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1673
 
    """ adds a pipe to the MixIn """
1674
 
    def process_request(self, request, client_address):
1675
 
        """Overrides and wraps the original process_request().
1676
 
        
1677
 
        This function creates a new pipe in self.pipe
1678
 
        """
1679
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1680
 
        
1681
 
        proc = MultiprocessingMixIn.process_request(self, request,
1682
 
                                                    client_address)
1683
 
        self.child_pipe.close()
1684
 
        self.add_pipe(parent_pipe, proc)
1685
 
    
1686
 
    def add_pipe(self, parent_pipe, proc):
1687
 
        """Dummy function; override as necessary"""
1688
 
        raise NotImplementedError
1689
 
 
1690
 
 
1691
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1692
 
                     socketserver.TCPServer, object):
1693
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1694
 
    
1695
 
    Attributes:
1696
 
        enabled:        Boolean; whether this server is activated yet
1697
 
        interface:      None or a network interface name (string)
1698
 
        use_ipv6:       Boolean; to use IPv6 or not
1699
 
    """
1700
 
    def __init__(self, server_address, RequestHandlerClass,
1701
 
                 interface=None, use_ipv6=True):
1702
 
        self.interface = interface
1703
 
        if use_ipv6:
1704
 
            self.address_family = socket.AF_INET6
1705
 
        socketserver.TCPServer.__init__(self, server_address,
1706
 
                                        RequestHandlerClass)
1707
 
    def server_bind(self):
1708
 
        """This overrides the normal server_bind() function
1709
 
        to bind to an interface if one was specified, and also NOT to
1710
 
        bind to an address or port if they were not specified."""
1711
 
        if self.interface is not None:
1712
 
            if SO_BINDTODEVICE is None:
1713
 
                logger.error("SO_BINDTODEVICE does not exist;"
1714
 
                             " cannot bind to interface %s",
1715
 
                             self.interface)
1716
 
            else:
 
34
            timeout = options.timeout
 
35
        self.timeout = timeout
 
36
        if interval == -1:
 
37
            interval = options.interval
 
38
        self.interval = interval
 
39
        self.next_check = datetime.datetime.now()
 
40
 
 
41
 
 
42
class server_metaclass(type):
 
43
    "Common behavior for the UDP and TCP server classes"
 
44
    def __new__(cls, name, bases, attrs):
 
45
        attrs["address_family"] = socket.AF_INET6
 
46
        attrs["allow_reuse_address"] = True
 
47
        def server_bind(self):
 
48
            if self.options.interface:
 
49
                if not hasattr(socket, "SO_BINDTODEVICE"):
 
50
                    # From /usr/include/asm-i486/socket.h
 
51
                    socket.SO_BINDTODEVICE = 25
1717
52
                try:
1718
53
                    self.socket.setsockopt(socket.SOL_SOCKET,
1719
 
                                           SO_BINDTODEVICE,
1720
 
                                           str(self.interface
1721
 
                                               + '\0'))
1722
 
                except socket.error as error:
 
54
                                           socket.SO_BINDTODEVICE,
 
55
                                           self.options.interface)
 
56
                except socket.error, error:
1723
57
                    if error[0] == errno.EPERM:
1724
 
                        logger.error("No permission to"
1725
 
                                     " bind to interface %s",
1726
 
                                     self.interface)
1727
 
                    elif error[0] == errno.ENOPROTOOPT:
1728
 
                        logger.error("SO_BINDTODEVICE not available;"
1729
 
                                     " cannot bind to interface %s",
1730
 
                                     self.interface)
 
58
                        print "Warning: No permission to bind to interface", \
 
59
                              self.options.interface
1731
60
                    else:
1732
 
                        raise
1733
 
        # Only bind(2) the socket if we really need to.
1734
 
        if self.server_address[0] or self.server_address[1]:
1735
 
            if not self.server_address[0]:
1736
 
                if self.address_family == socket.AF_INET6:
1737
 
                    any_address = "::" # in6addr_any
1738
 
                else:
1739
 
                    any_address = socket.INADDR_ANY
1740
 
                self.server_address = (any_address,
1741
 
                                       self.server_address[1])
1742
 
            elif not self.server_address[1]:
1743
 
                self.server_address = (self.server_address[0],
1744
 
                                       0)
1745
 
#                 if self.interface:
1746
 
#                     self.server_address = (self.server_address[0],
1747
 
#                                            0, # port
1748
 
#                                            0, # flowinfo
1749
 
#                                            if_nametoindex
1750
 
#                                            (self.interface))
1751
 
            return socketserver.TCPServer.server_bind(self)
1752
 
 
1753
 
 
1754
 
class MandosServer(IPv6_TCPServer):
1755
 
    """Mandos server.
1756
 
    
1757
 
    Attributes:
1758
 
        clients:        set of Client objects
1759
 
        gnutls_priority GnuTLS priority string
1760
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1761
 
    
1762
 
    Assumes a gobject.MainLoop event loop.
1763
 
    """
1764
 
    def __init__(self, server_address, RequestHandlerClass,
1765
 
                 interface=None, use_ipv6=True, clients=None,
1766
 
                 gnutls_priority=None, use_dbus=True):
1767
 
        self.enabled = False
1768
 
        self.clients = clients
1769
 
        if self.clients is None:
1770
 
            self.clients = {}
1771
 
        self.use_dbus = use_dbus
1772
 
        self.gnutls_priority = gnutls_priority
1773
 
        IPv6_TCPServer.__init__(self, server_address,
1774
 
                                RequestHandlerClass,
1775
 
                                interface = interface,
1776
 
                                use_ipv6 = use_ipv6)
1777
 
    def server_activate(self):
1778
 
        if self.enabled:
1779
 
            return socketserver.TCPServer.server_activate(self)
1780
 
    
1781
 
    def enable(self):
1782
 
        self.enabled = True
1783
 
    
1784
 
    def add_pipe(self, parent_pipe, proc):
1785
 
        # Call "handle_ipc" for both data and EOF events
1786
 
        gobject.io_add_watch(parent_pipe.fileno(),
1787
 
                             gobject.IO_IN | gobject.IO_HUP,
1788
 
                             functools.partial(self.handle_ipc,
1789
 
                                               parent_pipe =
1790
 
                                               parent_pipe,
1791
 
                                               proc = proc))
1792
 
    
1793
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1794
 
                   proc = None, client_object=None):
1795
 
        condition_names = {
1796
 
            gobject.IO_IN: "IN",   # There is data to read.
1797
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1798
 
                                    # blocking).
1799
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1800
 
            gobject.IO_ERR: "ERR", # Error condition.
1801
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1802
 
                                    # broken, usually for pipes and
1803
 
                                    # sockets).
1804
 
            }
1805
 
        conditions_string = ' | '.join(name
1806
 
                                       for cond, name in
1807
 
                                       condition_names.iteritems()
1808
 
                                       if cond & condition)
1809
 
        # error, or the other end of multiprocessing.Pipe has closed
1810
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1811
 
            # Wait for other process to exit
1812
 
            proc.join()
1813
 
            return False
1814
 
        
1815
 
        # Read a request from the child
1816
 
        request = parent_pipe.recv()
1817
 
        command = request[0]
1818
 
        
1819
 
        if command == 'init':
1820
 
            fpr = request[1]
1821
 
            address = request[2]
1822
 
            
1823
 
            for c in self.clients.itervalues():
1824
 
                if c.fingerprint == fpr:
1825
 
                    client = c
1826
 
                    break
1827
 
            else:
1828
 
                logger.info("Client not found for fingerprint: %s, ad"
1829
 
                            "dress: %s", fpr, address)
1830
 
                if self.use_dbus:
1831
 
                    # Emit D-Bus signal
1832
 
                    mandos_dbus_service.ClientNotFound(fpr,
1833
 
                                                       address[0])
1834
 
                parent_pipe.send(False)
1835
 
                return False
1836
 
            
1837
 
            gobject.io_add_watch(parent_pipe.fileno(),
1838
 
                                 gobject.IO_IN | gobject.IO_HUP,
1839
 
                                 functools.partial(self.handle_ipc,
1840
 
                                                   parent_pipe =
1841
 
                                                   parent_pipe,
1842
 
                                                   proc = proc,
1843
 
                                                   client_object =
1844
 
                                                   client))
1845
 
            parent_pipe.send(True)
1846
 
            # remove the old hook in favor of the new above hook on
1847
 
            # same fileno
1848
 
            return False
1849
 
        if command == 'funcall':
1850
 
            funcname = request[1]
1851
 
            args = request[2]
1852
 
            kwargs = request[3]
1853
 
            
1854
 
            parent_pipe.send(('data', getattr(client_object,
1855
 
                                              funcname)(*args,
1856
 
                                                         **kwargs)))
1857
 
        
1858
 
        if command == 'getattr':
1859
 
            attrname = request[1]
1860
 
            if callable(client_object.__getattribute__(attrname)):
1861
 
                parent_pipe.send(('function',))
1862
 
            else:
1863
 
                parent_pipe.send(('data', client_object
1864
 
                                  .__getattribute__(attrname)))
1865
 
        
1866
 
        if command == 'setattr':
1867
 
            attrname = request[1]
1868
 
            value = request[2]
1869
 
            setattr(client_object, attrname, value)
1870
 
        
1871
 
        return True
1872
 
 
 
61
                        raise error
 
62
            return super(type(self), self).server_bind()
 
63
        attrs["server_bind"] = server_bind
 
64
        def init(self, *args, **kwargs):
 
65
            if "options" in kwargs:
 
66
                self.options = kwargs["options"]
 
67
                del kwargs["options"]
 
68
            if "clients" in kwargs:
 
69
                self.clients = kwargs["clients"]
 
70
                del kwargs["clients"]
 
71
            if "credentials" in kwargs:
 
72
                self.credentials = kwargs["credentials"]
 
73
                del kwargs["credentials"]
 
74
            return super(type(self), self).__init__(*args, **kwargs)
 
75
        attrs["__init__"] = init
 
76
        return type.__new__(cls, name, bases, attrs)
 
77
 
 
78
 
 
79
class udp_handler(SocketServer.DatagramRequestHandler, object):
 
80
    def handle(self):
 
81
        self.wfile.write("Polo")
 
82
        print "UDP request answered"
 
83
 
 
84
 
 
85
class IPv6_UDPServer(SocketServer.UDPServer, object):
 
86
    __metaclass__ = server_metaclass
 
87
    def verify_request(self, request, client_address):
 
88
        print "UDP request came"
 
89
        return request[0] == "Marco"
 
90
 
 
91
 
 
92
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
93
    def handle(self):
 
94
        print "TCP request came"
 
95
        print "Request:", self.request
 
96
        print "Client Address:", self.client_address
 
97
        print "Server:", self.server
 
98
        session = gnutls.connection.ServerSession(self.request,
 
99
                                                  self.server.credentials)
 
100
        session.handshake()
 
101
        if session.peer_certificate:
 
102
            print "DN:", session.peer_certificate.subject
 
103
        try:
 
104
            session.verify_peer()
 
105
        except gnutls.errors.CertificateError, error:
 
106
            print "Verify failed", error
 
107
            session.bye()
 
108
            return
 
109
        try:
 
110
            session.send(dict((client.dn, client.password)
 
111
                              for client in self.server.clients)
 
112
                         [session.peer_certificate.subject])
 
113
        except KeyError:
 
114
            session.send("gazonk")
 
115
            # Log maybe? XXX
 
116
        session.bye()
 
117
 
 
118
 
 
119
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
120
    __metaclass__ = server_metaclass
 
121
    request_queue_size = 1024
 
122
 
 
123
 
 
124
in6addr_any = "::"
1873
125
 
1874
126
def string_to_delta(interval):
1875
127
    """Parse a string and return a datetime.timedelta
1876
 
    
 
128
 
1877
129
    >>> string_to_delta('7d')
1878
130
    datetime.timedelta(7)
1879
131
    >>> string_to_delta('60s')
1882
134
    datetime.timedelta(0, 3600)
1883
135
    >>> string_to_delta('24h')
1884
136
    datetime.timedelta(1)
1885
 
    >>> string_to_delta('1w')
 
137
    >>> string_to_delta(u'1w')
1886
138
    datetime.timedelta(7)
1887
 
    >>> string_to_delta('5m 30s')
1888
 
    datetime.timedelta(0, 330)
1889
139
    """
1890
 
    timevalue = datetime.timedelta(0)
1891
 
    for s in interval.split():
1892
 
        try:
1893
 
            suffix = unicode(s[-1])
1894
 
            value = int(s[:-1])
1895
 
            if suffix == "d":
1896
 
                delta = datetime.timedelta(value)
1897
 
            elif suffix == "s":
1898
 
                delta = datetime.timedelta(0, value)
1899
 
            elif suffix == "m":
1900
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1901
 
            elif suffix == "h":
1902
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1903
 
            elif suffix == "w":
1904
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1905
 
            else:
1906
 
                raise ValueError("Unknown suffix %r" % suffix)
1907
 
        except (ValueError, IndexError) as e:
1908
 
            raise ValueError(*(e.args))
1909
 
        timevalue += delta
1910
 
    return timevalue
1911
 
 
1912
 
 
1913
 
def daemon(nochdir = False, noclose = False):
1914
 
    """See daemon(3).  Standard BSD Unix function.
1915
 
    
1916
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1917
 
    if os.fork():
1918
 
        sys.exit()
1919
 
    os.setsid()
1920
 
    if not nochdir:
1921
 
        os.chdir("/")
1922
 
    if os.fork():
1923
 
        sys.exit()
1924
 
    if not noclose:
1925
 
        # Close all standard open file descriptors
1926
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1927
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1928
 
            raise OSError(errno.ENODEV,
1929
 
                          "%s not a character device"
1930
 
                          % os.path.devnull)
1931
 
        os.dup2(null, sys.stdin.fileno())
1932
 
        os.dup2(null, sys.stdout.fileno())
1933
 
        os.dup2(null, sys.stderr.fileno())
1934
 
        if null > 2:
1935
 
            os.close(null)
 
140
    try:
 
141
        suffix=unicode(interval[-1])
 
142
        value=int(interval[:-1])
 
143
        if suffix == u"d":
 
144
            delta = datetime.timedelta(value)
 
145
        elif suffix == u"s":
 
146
            delta = datetime.timedelta(0, value)
 
147
        elif suffix == u"m":
 
148
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
149
        elif suffix == u"h":
 
150
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
151
        elif suffix == u"w":
 
152
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
153
        else:
 
154
            raise ValueError
 
155
    except (ValueError, IndexError):
 
156
        raise ValueError
 
157
    return delta
1936
158
 
1937
159
 
1938
160
def main():
1939
 
    
1940
 
    ##################################################################
1941
 
    # Parsing of options, both command line and config file
1942
 
    
1943
 
    parser = argparse.ArgumentParser()
1944
 
    parser.add_argument("-v", "--version", action="version",
1945
 
                        version = "%%(prog)s %s" % version,
1946
 
                        help="show version number and exit")
1947
 
    parser.add_argument("-i", "--interface", metavar="IF",
1948
 
                        help="Bind to interface IF")
1949
 
    parser.add_argument("-a", "--address",
1950
 
                        help="Address to listen for requests on")
1951
 
    parser.add_argument("-p", "--port", type=int,
1952
 
                        help="Port number to receive requests on")
1953
 
    parser.add_argument("--check", action="store_true",
1954
 
                        help="Run self-test")
1955
 
    parser.add_argument("--debug", action="store_true",
1956
 
                        help="Debug mode; run in foreground and log"
1957
 
                        " to terminal")
1958
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1959
 
                        help="Debug level for stdout output")
1960
 
    parser.add_argument("--priority", help="GnuTLS"
1961
 
                        " priority string (see GnuTLS documentation)")
1962
 
    parser.add_argument("--servicename",
1963
 
                        metavar="NAME", help="Zeroconf service name")
1964
 
    parser.add_argument("--configdir",
1965
 
                        default="/etc/mandos", metavar="DIR",
1966
 
                        help="Directory to search for configuration"
1967
 
                        " files")
1968
 
    parser.add_argument("--no-dbus", action="store_false",
1969
 
                        dest="use_dbus", help="Do not provide D-Bus"
1970
 
                        " system bus interface")
1971
 
    parser.add_argument("--no-ipv6", action="store_false",
1972
 
                        dest="use_ipv6", help="Do not use IPv6")
1973
 
    parser.add_argument("--no-restore", action="store_false",
1974
 
                        dest="restore", help="Do not restore stored"
1975
 
                        " state")
1976
 
    parser.add_argument("--statedir", metavar="DIR",
1977
 
                        help="Directory to save/restore state in")
1978
 
    
1979
 
    options = parser.parse_args()
1980
 
    
 
161
    parser = OptionParser()
 
162
    parser.add_option("-i", "--interface", type="string",
 
163
                      default="eth0", metavar="IF",
 
164
                      help="Interface to bind to")
 
165
    parser.add_option("--cert", type="string", default="cert.pem",
 
166
                      metavar="FILE",
 
167
                      help="Public key certificate to use")
 
168
    parser.add_option("--key", type="string", default="key.pem",
 
169
                      metavar="FILE",
 
170
                      help="Private key to use")
 
171
    parser.add_option("--ca", type="string", default="ca.pem",
 
172
                      metavar="FILE",
 
173
                      help="Certificate Authority certificate to use")
 
174
    parser.add_option("--crl", type="string", default="crl.pem",
 
175
                      metavar="FILE",
 
176
                      help="Certificate Revokation List to use")
 
177
    parser.add_option("-p", "--port", type="int", default=49001,
 
178
                      help="Port number to receive requests on")
 
179
    parser.add_option("--dh", type="int", metavar="BITS",
 
180
                      help="DH group to use")
 
181
    parser.add_option("-t", "--timeout", type="string", # Parsed later
 
182
                      default="15m",
 
183
                      help="Amount of downtime allowed for clients")
 
184
    parser.add_option("--interval", type="string", # Parsed later
 
185
                      default="5m",
 
186
                      help="How often to check that a client is up")
 
187
    parser.add_option("--check", action="store_true", default=False,
 
188
                      help="Run self-test")
 
189
    (options, args) = parser.parse_args()
 
190
 
1981
191
    if options.check:
1982
192
        import doctest
1983
193
        doctest.testmod()
1984
194
        sys.exit()
1985
195
    
1986
 
    # Default values for config file for server-global settings
1987
 
    server_defaults = { "interface": "",
1988
 
                        "address": "",
1989
 
                        "port": "",
1990
 
                        "debug": "False",
1991
 
                        "priority":
1992
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1993
 
                        "servicename": "Mandos",
1994
 
                        "use_dbus": "True",
1995
 
                        "use_ipv6": "True",
1996
 
                        "debuglevel": "",
1997
 
                        "restore": "True",
1998
 
                        "statedir": "/var/lib/mandos"
1999
 
                        }
2000
 
    
2001
 
    # Parse config file for server-global settings
2002
 
    server_config = configparser.SafeConfigParser(server_defaults)
2003
 
    del server_defaults
2004
 
    server_config.read(os.path.join(options.configdir,
2005
 
                                    "mandos.conf"))
2006
 
    # Convert the SafeConfigParser object to a dict
2007
 
    server_settings = server_config.defaults()
2008
 
    # Use the appropriate methods on the non-string config options
2009
 
    for option in ("debug", "use_dbus", "use_ipv6"):
2010
 
        server_settings[option] = server_config.getboolean("DEFAULT",
2011
 
                                                           option)
2012
 
    if server_settings["port"]:
2013
 
        server_settings["port"] = server_config.getint("DEFAULT",
2014
 
                                                       "port")
2015
 
    del server_config
2016
 
    
2017
 
    # Override the settings from the config file with command line
2018
 
    # options, if set.
2019
 
    for option in ("interface", "address", "port", "debug",
2020
 
                   "priority", "servicename", "configdir",
2021
 
                   "use_dbus", "use_ipv6", "debuglevel", "restore",
2022
 
                   "statedir"):
2023
 
        value = getattr(options, option)
2024
 
        if value is not None:
2025
 
            server_settings[option] = value
2026
 
    del options
2027
 
    # Force all strings to be unicode
2028
 
    for option in server_settings.keys():
2029
 
        if type(server_settings[option]) is str:
2030
 
            server_settings[option] = unicode(server_settings[option])
2031
 
    # Now we have our good server settings in "server_settings"
2032
 
    
2033
 
    ##################################################################
2034
 
    
2035
 
    # For convenience
2036
 
    debug = server_settings["debug"]
2037
 
    debuglevel = server_settings["debuglevel"]
2038
 
    use_dbus = server_settings["use_dbus"]
2039
 
    use_ipv6 = server_settings["use_ipv6"]
2040
 
    stored_state_path = os.path.join(server_settings["statedir"],
2041
 
                                     stored_state_file)
2042
 
    
2043
 
    if debug:
2044
 
        initlogger(logging.DEBUG)
2045
 
    else:
2046
 
        if not debuglevel:
2047
 
            initlogger()
2048
 
        else:
2049
 
            level = getattr(logging, debuglevel.upper())
2050
 
            initlogger(level)
2051
 
    
2052
 
    if server_settings["servicename"] != "Mandos":
2053
 
        syslogger.setFormatter(logging.Formatter
2054
 
                               ('Mandos (%s) [%%(process)d]:'
2055
 
                                ' %%(levelname)s: %%(message)s'
2056
 
                                % server_settings["servicename"]))
2057
 
    
2058
 
    # Parse config file with clients
2059
 
    client_defaults = { "timeout": "5m",
2060
 
                        "extended_timeout": "15m",
2061
 
                        "interval": "2m",
2062
 
                        "checker": "fping -q -- %%(host)s",
2063
 
                        "host": "",
2064
 
                        "approval_delay": "0s",
2065
 
                        "approval_duration": "1s",
2066
 
                        }
2067
 
    client_config = configparser.SafeConfigParser(client_defaults)
2068
 
    client_config.read(os.path.join(server_settings["configdir"],
2069
 
                                    "clients.conf"))
2070
 
    
2071
 
    global mandos_dbus_service
2072
 
    mandos_dbus_service = None
2073
 
    
2074
 
    tcp_server = MandosServer((server_settings["address"],
2075
 
                               server_settings["port"]),
2076
 
                              ClientHandler,
2077
 
                              interface=(server_settings["interface"]
2078
 
                                         or None),
2079
 
                              use_ipv6=use_ipv6,
2080
 
                              gnutls_priority=
2081
 
                              server_settings["priority"],
2082
 
                              use_dbus=use_dbus)
2083
 
    if not debug:
2084
 
        pidfilename = "/var/run/mandos.pid"
2085
 
        try:
2086
 
            pidfile = open(pidfilename, "w")
2087
 
        except IOError:
2088
 
            logger.error("Could not open file %r", pidfilename)
2089
 
    
2090
 
    try:
2091
 
        uid = pwd.getpwnam("_mandos").pw_uid
2092
 
        gid = pwd.getpwnam("_mandos").pw_gid
2093
 
    except KeyError:
2094
 
        try:
2095
 
            uid = pwd.getpwnam("mandos").pw_uid
2096
 
            gid = pwd.getpwnam("mandos").pw_gid
2097
 
        except KeyError:
2098
 
            try:
2099
 
                uid = pwd.getpwnam("nobody").pw_uid
2100
 
                gid = pwd.getpwnam("nobody").pw_gid
2101
 
            except KeyError:
2102
 
                uid = 65534
2103
 
                gid = 65534
2104
 
    try:
2105
 
        os.setgid(gid)
2106
 
        os.setuid(uid)
2107
 
    except OSError as error:
2108
 
        if error[0] != errno.EPERM:
2109
 
            raise error
2110
 
    
2111
 
    if debug:
2112
 
        # Enable all possible GnuTLS debugging
2113
 
        
2114
 
        # "Use a log level over 10 to enable all debugging options."
2115
 
        # - GnuTLS manual
2116
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
2117
 
        
2118
 
        @gnutls.library.types.gnutls_log_func
2119
 
        def debug_gnutls(level, string):
2120
 
            logger.debug("GnuTLS: %s", string[:-1])
2121
 
        
2122
 
        (gnutls.library.functions
2123
 
         .gnutls_global_set_log_function(debug_gnutls))
2124
 
        
2125
 
        # Redirect stdin so all checkers get /dev/null
2126
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2127
 
        os.dup2(null, sys.stdin.fileno())
2128
 
        if null > 2:
2129
 
            os.close(null)
2130
 
    else:
2131
 
        # No console logging
2132
 
        logger.removeHandler(console)
2133
 
    
2134
 
    # Need to fork before connecting to D-Bus
2135
 
    if not debug:
2136
 
        # Close all input and output, do double fork, etc.
2137
 
        daemon()
2138
 
    
2139
 
    global main_loop
2140
 
    # From the Avahi example code
2141
 
    DBusGMainLoop(set_as_default=True )
2142
 
    main_loop = gobject.MainLoop()
2143
 
    bus = dbus.SystemBus()
2144
 
    # End of Avahi example code
2145
 
    if use_dbus:
2146
 
        try:
2147
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
2148
 
                                            bus, do_not_queue=True)
2149
 
            old_bus_name = (dbus.service.BusName
2150
 
                            ("se.bsnet.fukt.Mandos", bus,
2151
 
                             do_not_queue=True))
2152
 
        except dbus.exceptions.NameExistsException as e:
2153
 
            logger.error(unicode(e) + ", disabling D-Bus")
2154
 
            use_dbus = False
2155
 
            server_settings["use_dbus"] = False
2156
 
            tcp_server.use_dbus = False
2157
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2158
 
    service = AvahiServiceToSyslog(name =
2159
 
                                   server_settings["servicename"],
2160
 
                                   servicetype = "_mandos._tcp",
2161
 
                                   protocol = protocol, bus = bus)
2162
 
    if server_settings["interface"]:
2163
 
        service.interface = (if_nametoindex
2164
 
                             (str(server_settings["interface"])))
2165
 
    
2166
 
    global multiprocessing_manager
2167
 
    multiprocessing_manager = multiprocessing.Manager()
2168
 
    
2169
 
    client_class = Client
2170
 
    if use_dbus:
2171
 
        client_class = functools.partial(ClientDBusTransitional,
2172
 
                                         bus = bus)
2173
 
    
2174
 
    special_settings = {
2175
 
        # Some settings need to be accessd by special methods;
2176
 
        # booleans need .getboolean(), etc.  Here is a list of them:
2177
 
        "approved_by_default":
2178
 
            lambda section:
2179
 
            client_config.getboolean(section, "approved_by_default"),
2180
 
        }
2181
 
    # Construct a new dict of client settings of this form:
2182
 
    # { client_name: {setting_name: value, ...}, ...}
2183
 
    # with exceptions for any special settings as defined above
2184
 
    client_settings = dict((clientname,
2185
 
                           dict((setting,
2186
 
                                 (value
2187
 
                                  if setting not in special_settings
2188
 
                                  else special_settings[setting]
2189
 
                                  (clientname)))
2190
 
                                for setting, value in
2191
 
                                client_config.items(clientname)))
2192
 
                          for clientname in client_config.sections())
2193
 
    
2194
 
    old_client_settings = {}
2195
 
    clients_data = []
2196
 
    
2197
 
    # Get client data and settings from last running state.
2198
 
    if server_settings["restore"]:
2199
 
        try:
2200
 
            with open(stored_state_path, "rb") as stored_state:
2201
 
                clients_data, old_client_settings = (pickle.load
2202
 
                                                     (stored_state))
2203
 
            os.remove(stored_state_path)
2204
 
        except IOError as e:
2205
 
            logger.warning("Could not load persistent state: {0}"
2206
 
                           .format(e))
2207
 
            if e.errno != errno.ENOENT:
2208
 
                raise
2209
 
    
2210
 
    with Crypto() as crypt:
2211
 
        for client in clients_data:
2212
 
            client_name = client["name"]
2213
 
            
2214
 
            # Decide which value to use after restoring saved state.
2215
 
            # We have three different values: Old config file,
2216
 
            # new config file, and saved state.
2217
 
            # New config value takes precedence if it differs from old
2218
 
            # config value, otherwise use saved state.
2219
 
            for name, value in client_settings[client_name].items():
2220
 
                try:
2221
 
                    # For each value in new config, check if it
2222
 
                    # differs from the old config value (Except for
2223
 
                    # the "secret" attribute)
2224
 
                    if (name != "secret" and
2225
 
                        value != old_client_settings[client_name]
2226
 
                        [name]):
2227
 
                        setattr(client, name, value)
2228
 
                except KeyError:
2229
 
                    pass
2230
 
            
2231
 
            # Clients who has passed its expire date can still be
2232
 
            # enabled if its last checker was sucessful.  Clients
2233
 
            # whose checker failed before we stored its state is
2234
 
            # assumed to have failed all checkers during downtime.
2235
 
            if client["enabled"] and client["last_checked_ok"]:
2236
 
                if ((datetime.datetime.utcnow()
2237
 
                     - client["last_checked_ok"])
2238
 
                    > client["interval"]):
2239
 
                    if client["last_checker_status"] != 0:
2240
 
                        client["enabled"] = False
2241
 
                    else:
2242
 
                        client["expires"] = (datetime.datetime
2243
 
                                             .utcnow()
2244
 
                                             + client["timeout"])
2245
 
            
2246
 
            client["changedstate"] = (multiprocessing_manager
2247
 
                                      .Condition
2248
 
                                      (multiprocessing_manager
2249
 
                                       .Lock()))
2250
 
            if use_dbus:
2251
 
                new_client = (ClientDBusTransitional.__new__
2252
 
                              (ClientDBusTransitional))
2253
 
                tcp_server.clients[client_name] = new_client
2254
 
                new_client.bus = bus
2255
 
                for name, value in client.iteritems():
2256
 
                    setattr(new_client, name, value)
2257
 
                client_object_name = unicode(client_name).translate(
2258
 
                    {ord("."): ord("_"),
2259
 
                     ord("-"): ord("_")})
2260
 
                new_client.dbus_object_path = (dbus.ObjectPath
2261
 
                                               ("/clients/"
2262
 
                                                + client_object_name))
2263
 
                DBusObjectWithProperties.__init__(new_client,
2264
 
                                                  new_client.bus,
2265
 
                                                  new_client
2266
 
                                                  .dbus_object_path)
2267
 
            else:
2268
 
                tcp_server.clients[client_name] = (Client.__new__
2269
 
                                                   (Client))
2270
 
                for name, value in client.iteritems():
2271
 
                    setattr(tcp_server.clients[client_name],
2272
 
                            name, value)
2273
 
            
2274
 
            try:
2275
 
                tcp_server.clients[client_name].secret = (
2276
 
                    crypt.decrypt(tcp_server.clients[client_name]
2277
 
                                  .encrypted_secret,
2278
 
                                  client_settings[client_name]
2279
 
                                  ["secret"]))
2280
 
            except CryptoError:
2281
 
                # If decryption fails, we use secret from new settings
2282
 
                tcp_server.clients[client_name].secret = (
2283
 
                    client_settings[client_name]["secret"])
2284
 
    
2285
 
    # Create/remove clients based on new changes made to config
2286
 
    for clientname in set(old_client_settings) - set(client_settings):
2287
 
        del tcp_server.clients[clientname]
2288
 
    for clientname in set(client_settings) - set(old_client_settings):
2289
 
        tcp_server.clients[clientname] = (client_class(name
2290
 
                                                       = clientname,
2291
 
                                                       config =
2292
 
                                                       client_settings
2293
 
                                                       [clientname]))
2294
 
    
2295
 
    if not tcp_server.clients:
2296
 
        logger.warning("No clients defined")
2297
 
        
2298
 
    if not debug:
2299
 
        try:
2300
 
            with pidfile:
2301
 
                pid = os.getpid()
2302
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2303
 
            del pidfile
2304
 
        except IOError:
2305
 
            logger.error("Could not write to file %r with PID %d",
2306
 
                         pidfilename, pid)
2307
 
        except NameError:
2308
 
            # "pidfile" was never created
2309
 
            pass
2310
 
        del pidfilename
2311
 
        
2312
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2313
 
    
2314
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2315
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2316
 
    
2317
 
    if use_dbus:
2318
 
        class MandosDBusService(dbus.service.Object):
2319
 
            """A D-Bus proxy object"""
2320
 
            def __init__(self):
2321
 
                dbus.service.Object.__init__(self, bus, "/")
2322
 
            _interface = "se.recompile.Mandos"
2323
 
            
2324
 
            @dbus.service.signal(_interface, signature="o")
2325
 
            def ClientAdded(self, objpath):
2326
 
                "D-Bus signal"
2327
 
                pass
2328
 
            
2329
 
            @dbus.service.signal(_interface, signature="ss")
2330
 
            def ClientNotFound(self, fingerprint, address):
2331
 
                "D-Bus signal"
2332
 
                pass
2333
 
            
2334
 
            @dbus.service.signal(_interface, signature="os")
2335
 
            def ClientRemoved(self, objpath, name):
2336
 
                "D-Bus signal"
2337
 
                pass
2338
 
            
2339
 
            @dbus.service.method(_interface, out_signature="ao")
2340
 
            def GetAllClients(self):
2341
 
                "D-Bus method"
2342
 
                return dbus.Array(c.dbus_object_path
2343
 
                                  for c in
2344
 
                                  tcp_server.clients.itervalues())
2345
 
            
2346
 
            @dbus.service.method(_interface,
2347
 
                                 out_signature="a{oa{sv}}")
2348
 
            def GetAllClientsWithProperties(self):
2349
 
                "D-Bus method"
2350
 
                return dbus.Dictionary(
2351
 
                    ((c.dbus_object_path, c.GetAll(""))
2352
 
                     for c in tcp_server.clients.itervalues()),
2353
 
                    signature="oa{sv}")
2354
 
            
2355
 
            @dbus.service.method(_interface, in_signature="o")
2356
 
            def RemoveClient(self, object_path):
2357
 
                "D-Bus method"
2358
 
                for c in tcp_server.clients.itervalues():
2359
 
                    if c.dbus_object_path == object_path:
2360
 
                        del tcp_server.clients[c.name]
2361
 
                        c.remove_from_connection()
2362
 
                        # Don't signal anything except ClientRemoved
2363
 
                        c.disable(quiet=True)
2364
 
                        # Emit D-Bus signal
2365
 
                        self.ClientRemoved(object_path, c.name)
2366
 
                        return
2367
 
                raise KeyError(object_path)
2368
 
            
2369
 
            del _interface
2370
 
        
2371
 
        class MandosDBusServiceTransitional(MandosDBusService):
2372
 
            __metaclass__ = AlternateDBusNamesMetaclass
2373
 
        mandos_dbus_service = MandosDBusServiceTransitional()
2374
 
    
2375
 
    def cleanup():
2376
 
        "Cleanup function; run on exit"
2377
 
        service.cleanup()
2378
 
        
2379
 
        multiprocessing.active_children()
2380
 
        if not (tcp_server.clients or client_settings):
2381
 
            return
2382
 
        
2383
 
        # Store client before exiting. Secrets are encrypted with key
2384
 
        # based on what config file has. If config file is
2385
 
        # removed/edited, old secret will thus be unrecovable.
2386
 
        clients = []
2387
 
        with Crypto() as crypt:
2388
 
            for client in tcp_server.clients.itervalues():
2389
 
                key = client_settings[client.name]["secret"]
2390
 
                client.encrypted_secret = crypt.encrypt(client.secret,
2391
 
                                                        key)
2392
 
                client_dict = {}
2393
 
                
2394
 
                # A list of attributes that will not be stored when
2395
 
                # shutting down.
2396
 
                exclude = set(("bus", "changedstate", "secret"))
2397
 
                for name, typ in (inspect.getmembers
2398
 
                                  (dbus.service.Object)):
2399
 
                    exclude.add(name)
2400
 
                
2401
 
                client_dict["encrypted_secret"] = (client
2402
 
                                                   .encrypted_secret)
2403
 
                for attr in client.client_structure:
2404
 
                    if attr not in exclude:
2405
 
                        client_dict[attr] = getattr(client, attr)
2406
 
                
2407
 
                clients.append(client_dict)
2408
 
                del client_settings[client.name]["secret"]
2409
 
        
2410
 
        try:
2411
 
            with os.fdopen(os.open(stored_state_path,
2412
 
                                   os.O_CREAT|os.O_WRONLY|os.O_TRUNC,
2413
 
                                   0600), "wb") as stored_state:
2414
 
                pickle.dump((clients, client_settings), stored_state)
2415
 
        except (IOError, OSError) as e:
2416
 
            logger.warning("Could not save persistent state: {0}"
2417
 
                           .format(e))
2418
 
            if e.errno not in (errno.ENOENT, errno.EACCES):
2419
 
                raise
2420
 
        
2421
 
        # Delete all clients, and settings from config
2422
 
        while tcp_server.clients:
2423
 
            name, client = tcp_server.clients.popitem()
2424
 
            if use_dbus:
2425
 
                client.remove_from_connection()
2426
 
            # Don't signal anything except ClientRemoved
2427
 
            client.disable(quiet=True)
2428
 
            if use_dbus:
2429
 
                # Emit D-Bus signal
2430
 
                mandos_dbus_service.ClientRemoved(client
2431
 
                                                  .dbus_object_path,
2432
 
                                                  client.name)
2433
 
        client_settings.clear()
2434
 
    
2435
 
    atexit.register(cleanup)
2436
 
    
2437
 
    for client in tcp_server.clients.itervalues():
2438
 
        if use_dbus:
2439
 
            # Emit D-Bus signal
2440
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2441
 
        # Need to initiate checking of clients
2442
 
        if client.enabled:
2443
 
            client.init_checker()
2444
 
    
2445
 
    tcp_server.enable()
2446
 
    tcp_server.server_activate()
2447
 
    
2448
 
    # Find out what port we got
2449
 
    service.port = tcp_server.socket.getsockname()[1]
2450
 
    if use_ipv6:
2451
 
        logger.info("Now listening on address %r, port %d,"
2452
 
                    " flowinfo %d, scope_id %d"
2453
 
                    % tcp_server.socket.getsockname())
2454
 
    else:                       # IPv4
2455
 
        logger.info("Now listening on address %r, port %d"
2456
 
                    % tcp_server.socket.getsockname())
2457
 
    
2458
 
    #service.interface = tcp_server.socket.getsockname()[3]
2459
 
    
2460
 
    try:
2461
 
        # From the Avahi example code
2462
 
        try:
2463
 
            service.activate()
2464
 
        except dbus.exceptions.DBusException as error:
2465
 
            logger.critical("DBusException: %s", error)
2466
 
            cleanup()
2467
 
            sys.exit(1)
2468
 
        # End of Avahi example code
2469
 
        
2470
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2471
 
                             lambda *args, **kwargs:
2472
 
                             (tcp_server.handle_request
2473
 
                              (*args[2:], **kwargs) or True))
2474
 
        
2475
 
        logger.debug("Starting main loop")
2476
 
        main_loop.run()
2477
 
    except AvahiError as error:
2478
 
        logger.critical("AvahiError: %s", error)
2479
 
        cleanup()
2480
 
        sys.exit(1)
2481
 
    except KeyboardInterrupt:
2482
 
        if debug:
2483
 
            print("", file=sys.stderr)
2484
 
        logger.debug("Server received KeyboardInterrupt")
2485
 
    logger.debug("Server exiting")
2486
 
    # Must run before the D-Bus bus name gets deregistered
2487
 
    cleanup()
2488
 
 
2489
 
 
2490
 
if __name__ == '__main__':
 
196
    # Parse the time arguments
 
197
    try:
 
198
        options.timeout = string_to_delta(options.timeout)
 
199
    except ValueError:
 
200
        parser.error("option --timeout: Unparseable time")
 
201
    
 
202
    try:
 
203
        options.interval = string_to_delta(options.interval)
 
204
    except ValueError:
 
205
        parser.error("option --interval: Unparseable time")
 
206
    
 
207
    cert = gnutls.crypto.X509Certificate(open(options.cert).read())
 
208
    key = gnutls.crypto.X509PrivateKey(open(options.key).read())
 
209
    ca = gnutls.crypto.X509Certificate(open(options.ca).read())
 
210
    crl = gnutls.crypto.X509CRL(open(options.crl).read())
 
211
    cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
 
212
    
 
213
    # Parse config file
 
214
    defaults = {}
 
215
    client_config_object = ConfigParser.SafeConfigParser(defaults)
 
216
    client_config_object.read("mandos-clients.conf")
 
217
    clients = [Client(name=section, options=options,
 
218
                      **(dict(client_config_object.items(section))))
 
219
               for section in client_config_object.sections()]
 
220
    
 
221
    udp_server = IPv6_UDPServer((in6addr_any, options.port),
 
222
                                udp_handler,
 
223
                                options=options)
 
224
    
 
225
    tcp_server = IPv6_TCPServer((in6addr_any, options.port),
 
226
                                tcp_handler,
 
227
                                options=options,
 
228
                                clients=clients,
 
229
                                credentials=cred)
 
230
    
 
231
    while True:
 
232
        in_, out, err = select.select((udp_server,
 
233
                                       tcp_server), (), ())
 
234
        for server in in_:
 
235
            server.handle_request()
 
236
 
 
237
 
 
238
if __name__ == "__main__":
2491
239
    main()
 
240