/mandos/release

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

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1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
13
 
# Everything else is
14
 
# Copyright © 2008-2012 Teddy Hogeborn
15
 
# Copyright © 2008-2012 Björn Påhlsson
16
 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
31
 
# Contact the authors at <mandos@recompile.se>.
32
 
33
 
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
36
 
 
37
 
from future_builtins import *
38
 
 
39
 
import SocketServer as socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
40
6
import socket
41
 
import argparse
 
7
import select
 
8
from optparse import OptionParser
42
9
import datetime
43
10
import errno
44
11
import gnutls.crypto
47
14
import gnutls.library.functions
48
15
import gnutls.library.constants
49
16
import gnutls.library.types
50
 
import ConfigParser as configparser
 
17
import ConfigParser
51
18
import sys
52
19
import re
53
20
import os
54
21
import signal
 
22
from sets import Set
55
23
import subprocess
56
 
import atexit
57
 
import stat
58
 
import logging
59
 
import logging.handlers
60
 
import pwd
61
 
import contextlib
62
 
import struct
63
 
import fcntl
64
 
import functools
65
 
import cPickle as pickle
66
 
import multiprocessing
67
 
import types
68
 
import binascii
69
 
import tempfile
70
 
import itertools
71
24
 
72
25
import dbus
73
 
import dbus.service
74
26
import gobject
75
27
import avahi
76
28
from dbus.mainloop.glib import DBusGMainLoop
77
29
import ctypes
78
 
import ctypes.util
79
 
import xml.dom.minidom
80
 
import inspect
81
 
import GnuPGInterface
82
 
 
83
 
try:
84
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
85
 
except AttributeError:
86
 
    try:
87
 
        from IN import SO_BINDTODEVICE
88
 
    except ImportError:
89
 
        SO_BINDTODEVICE = None
90
 
 
91
 
version = "1.5.5"
92
 
stored_state_file = "clients.pickle"
93
 
 
94
 
logger = logging.getLogger()
95
 
syslogger = (logging.handlers.SysLogHandler
96
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
97
 
              address = str("/dev/log")))
98
 
 
99
 
try:
100
 
    if_nametoindex = (ctypes.cdll.LoadLibrary
101
 
                      (ctypes.util.find_library("c"))
102
 
                      .if_nametoindex)
103
 
except (OSError, AttributeError):
104
 
    def if_nametoindex(interface):
105
 
        "Get an interface index the hard way, i.e. using fcntl()"
106
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
107
 
        with contextlib.closing(socket.socket()) as s:
108
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
109
 
                                struct.pack(str("16s16x"),
110
 
                                            interface))
111
 
        interface_index = struct.unpack(str("I"),
112
 
                                        ifreq[16:20])[0]
113
 
        return interface_index
114
 
 
115
 
 
116
 
def initlogger(debug, level=logging.WARNING):
117
 
    """init logger and add loglevel"""
118
 
    
119
 
    syslogger.setFormatter(logging.Formatter
120
 
                           ('Mandos [%(process)d]: %(levelname)s:'
121
 
                            ' %(message)s'))
122
 
    logger.addHandler(syslogger)
123
 
    
124
 
    if debug:
125
 
        console = logging.StreamHandler()
126
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
127
 
                                               ' [%(process)d]:'
128
 
                                               ' %(levelname)s:'
129
 
                                               ' %(message)s'))
130
 
        logger.addHandler(console)
131
 
    logger.setLevel(level)
132
 
 
133
 
 
134
 
class PGPError(Exception):
135
 
    """Exception if encryption/decryption fails"""
136
 
    pass
137
 
 
138
 
 
139
 
class PGPEngine(object):
140
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
141
 
    def __init__(self):
142
 
        self.gnupg = GnuPGInterface.GnuPG()
143
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
144
 
        self.gnupg = GnuPGInterface.GnuPG()
145
 
        self.gnupg.options.meta_interactive = False
146
 
        self.gnupg.options.homedir = self.tempdir
147
 
        self.gnupg.options.extra_args.extend(['--force-mdc',
148
 
                                              '--quiet',
149
 
                                              '--no-use-agent'])
150
 
    
151
 
    def __enter__(self):
152
 
        return self
153
 
    
154
 
    def __exit__(self, exc_type, exc_value, traceback):
155
 
        self._cleanup()
156
 
        return False
157
 
    
158
 
    def __del__(self):
159
 
        self._cleanup()
160
 
    
161
 
    def _cleanup(self):
162
 
        if self.tempdir is not None:
163
 
            # Delete contents of tempdir
164
 
            for root, dirs, files in os.walk(self.tempdir,
165
 
                                             topdown = False):
166
 
                for filename in files:
167
 
                    os.remove(os.path.join(root, filename))
168
 
                for dirname in dirs:
169
 
                    os.rmdir(os.path.join(root, dirname))
170
 
            # Remove tempdir
171
 
            os.rmdir(self.tempdir)
172
 
            self.tempdir = None
173
 
    
174
 
    def password_encode(self, password):
175
 
        # Passphrase can not be empty and can not contain newlines or
176
 
        # NUL bytes.  So we prefix it and hex encode it.
177
 
        return b"mandos" + binascii.hexlify(password)
178
 
    
179
 
    def encrypt(self, data, password):
180
 
        self.gnupg.passphrase = self.password_encode(password)
181
 
        with open(os.devnull, "w") as devnull:
182
 
            try:
183
 
                proc = self.gnupg.run(['--symmetric'],
184
 
                                      create_fhs=['stdin', 'stdout'],
185
 
                                      attach_fhs={'stderr': devnull})
186
 
                with contextlib.closing(proc.handles['stdin']) as f:
187
 
                    f.write(data)
188
 
                with contextlib.closing(proc.handles['stdout']) as f:
189
 
                    ciphertext = f.read()
190
 
                proc.wait()
191
 
            except IOError as e:
192
 
                raise PGPError(e)
193
 
        self.gnupg.passphrase = None
194
 
        return ciphertext
195
 
    
196
 
    def decrypt(self, data, password):
197
 
        self.gnupg.passphrase = self.password_encode(password)
198
 
        with open(os.devnull, "w") as devnull:
199
 
            try:
200
 
                proc = self.gnupg.run(['--decrypt'],
201
 
                                      create_fhs=['stdin', 'stdout'],
202
 
                                      attach_fhs={'stderr': devnull})
203
 
                with contextlib.closing(proc.handles['stdin']) as f:
204
 
                    f.write(data)
205
 
                with contextlib.closing(proc.handles['stdout']) as f:
206
 
                    decrypted_plaintext = f.read()
207
 
                proc.wait()
208
 
            except IOError as e:
209
 
                raise PGPError(e)
210
 
        self.gnupg.passphrase = None
211
 
        return decrypted_plaintext
212
 
 
213
 
 
214
 
class AvahiError(Exception):
215
 
    def __init__(self, value, *args, **kwargs):
216
 
        self.value = value
217
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
218
 
    def __unicode__(self):
219
 
        return unicode(repr(self.value))
220
 
 
221
 
class AvahiServiceError(AvahiError):
222
 
    pass
223
 
 
224
 
class AvahiGroupError(AvahiError):
225
 
    pass
226
 
 
227
 
 
228
 
class AvahiService(object):
229
 
    """An Avahi (Zeroconf) service.
230
 
    
231
 
    Attributes:
232
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
233
 
               Used to optionally bind to the specified interface.
234
 
    name: string; Example: 'Mandos'
235
 
    type: string; Example: '_mandos._tcp'.
236
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
237
 
    port: integer; what port to announce
238
 
    TXT: list of strings; TXT record for the service
239
 
    domain: string; Domain to publish on, default to .local if empty.
240
 
    host: string; Host to publish records for, default is localhost
241
 
    max_renames: integer; maximum number of renames
242
 
    rename_count: integer; counter so we only rename after collisions
243
 
                  a sensible number of times
244
 
    group: D-Bus Entry Group
245
 
    server: D-Bus Server
246
 
    bus: dbus.SystemBus()
247
 
    """
248
 
    
249
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
250
 
                 servicetype = None, port = None, TXT = None,
251
 
                 domain = "", host = "", max_renames = 32768,
252
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
253
 
        self.interface = interface
254
 
        self.name = name
255
 
        self.type = servicetype
256
 
        self.port = port
257
 
        self.TXT = TXT if TXT is not None else []
258
 
        self.domain = domain
259
 
        self.host = host
260
 
        self.rename_count = 0
261
 
        self.max_renames = max_renames
262
 
        self.protocol = protocol
263
 
        self.group = None       # our entry group
264
 
        self.server = None
265
 
        self.bus = bus
266
 
        self.entry_group_state_changed_match = None
267
 
    
268
 
    def rename(self):
269
 
        """Derived from the Avahi example code"""
270
 
        if self.rename_count >= self.max_renames:
271
 
            logger.critical("No suitable Zeroconf service name found"
272
 
                            " after %i retries, exiting.",
273
 
                            self.rename_count)
274
 
            raise AvahiServiceError("Too many renames")
275
 
        self.name = unicode(self.server
276
 
                            .GetAlternativeServiceName(self.name))
277
 
        logger.info("Changing Zeroconf service name to %r ...",
278
 
                    self.name)
279
 
        self.remove()
280
 
        try:
281
 
            self.add()
282
 
        except dbus.exceptions.DBusException as error:
283
 
            logger.critical("D-Bus Exception", exc_info=error)
284
 
            self.cleanup()
285
 
            os._exit(1)
286
 
        self.rename_count += 1
287
 
    
288
 
    def remove(self):
289
 
        """Derived from the Avahi example code"""
290
 
        if self.entry_group_state_changed_match is not None:
291
 
            self.entry_group_state_changed_match.remove()
292
 
            self.entry_group_state_changed_match = None
293
 
        if self.group is not None:
294
 
            self.group.Reset()
295
 
    
296
 
    def add(self):
297
 
        """Derived from the Avahi example code"""
298
 
        self.remove()
299
 
        if self.group is None:
300
 
            self.group = dbus.Interface(
301
 
                self.bus.get_object(avahi.DBUS_NAME,
302
 
                                    self.server.EntryGroupNew()),
303
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
304
 
        self.entry_group_state_changed_match = (
305
 
            self.group.connect_to_signal(
306
 
                'StateChanged', self.entry_group_state_changed))
307
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
308
 
                     self.name, self.type)
309
 
        self.group.AddService(
310
 
            self.interface,
311
 
            self.protocol,
312
 
            dbus.UInt32(0),     # flags
313
 
            self.name, self.type,
314
 
            self.domain, self.host,
315
 
            dbus.UInt16(self.port),
316
 
            avahi.string_array_to_txt_array(self.TXT))
317
 
        self.group.Commit()
318
 
    
319
 
    def entry_group_state_changed(self, state, error):
320
 
        """Derived from the Avahi example code"""
321
 
        logger.debug("Avahi entry group state change: %i", state)
322
 
        
323
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
324
 
            logger.debug("Zeroconf service established.")
325
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
326
 
            logger.info("Zeroconf service name collision.")
327
 
            self.rename()
328
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
329
 
            logger.critical("Avahi: Error in group state changed %s",
330
 
                            unicode(error))
331
 
            raise AvahiGroupError("State changed: {0!s}"
332
 
                                  .format(error))
333
 
    
334
 
    def cleanup(self):
335
 
        """Derived from the Avahi example code"""
336
 
        if self.group is not None:
337
 
            try:
338
 
                self.group.Free()
339
 
            except (dbus.exceptions.UnknownMethodException,
340
 
                    dbus.exceptions.DBusException):
341
 
                pass
342
 
            self.group = None
343
 
        self.remove()
344
 
    
345
 
    def server_state_changed(self, state, error=None):
346
 
        """Derived from the Avahi example code"""
347
 
        logger.debug("Avahi server state change: %i", state)
348
 
        bad_states = { avahi.SERVER_INVALID:
349
 
                           "Zeroconf server invalid",
350
 
                       avahi.SERVER_REGISTERING: None,
351
 
                       avahi.SERVER_COLLISION:
352
 
                           "Zeroconf server name collision",
353
 
                       avahi.SERVER_FAILURE:
354
 
                           "Zeroconf server failure" }
355
 
        if state in bad_states:
356
 
            if bad_states[state] is not None:
357
 
                if error is None:
358
 
                    logger.error(bad_states[state])
359
 
                else:
360
 
                    logger.error(bad_states[state] + ": %r", error)
361
 
            self.cleanup()
362
 
        elif state == avahi.SERVER_RUNNING:
363
 
            self.add()
364
 
        else:
365
 
            if error is None:
366
 
                logger.debug("Unknown state: %r", state)
367
 
            else:
368
 
                logger.debug("Unknown state: %r: %r", state, error)
369
 
    
370
 
    def activate(self):
371
 
        """Derived from the Avahi example code"""
372
 
        if self.server is None:
373
 
            self.server = dbus.Interface(
374
 
                self.bus.get_object(avahi.DBUS_NAME,
375
 
                                    avahi.DBUS_PATH_SERVER,
376
 
                                    follow_name_owner_changes=True),
377
 
                avahi.DBUS_INTERFACE_SERVER)
378
 
        self.server.connect_to_signal("StateChanged",
379
 
                                 self.server_state_changed)
380
 
        self.server_state_changed(self.server.GetState())
381
 
 
382
 
 
383
 
class AvahiServiceToSyslog(AvahiService):
384
 
    def rename(self):
385
 
        """Add the new name to the syslog messages"""
386
 
        ret = AvahiService.rename(self)
387
 
        syslogger.setFormatter(logging.Formatter
388
 
                               ('Mandos ({0}) [%(process)d]:'
389
 
                                ' %(levelname)s: %(message)s'
390
 
                                .format(self.name)))
391
 
        return ret
392
 
 
393
 
 
394
 
def timedelta_to_milliseconds(td):
395
 
    "Convert a datetime.timedelta() to milliseconds"
396
 
    return ((td.days * 24 * 60 * 60 * 1000)
397
 
            + (td.seconds * 1000)
398
 
            + (td.microseconds // 1000))
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
 
36
logger = logging.Logger('mandos')
 
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
 
38
 
 
39
# This variable is used to optionally bind to a specified interface.
 
40
# It is a global variable to fit in with the other variables from the
 
41
# Avahi server example code.
 
42
serviceInterface = avahi.IF_UNSPEC
 
43
# From the Avahi server example code:
 
44
serviceName = "Mandos"
 
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
46
servicePort = None                      # Not known at startup
 
47
serviceTXT = []                         # TXT record for the service
 
48
domain = ""                  # Domain to publish on, default to .local
 
49
host = ""          # Host to publish records for, default to localhost
 
50
group = None #our entry group
 
51
rename_count = 12       # Counter so we only rename after collisions a
 
52
                        # sensible number of times
 
53
# End of Avahi example code
399
54
 
400
55
 
401
56
class Client(object):
402
57
    """A representation of a client host served by this server.
403
 
    
404
58
    Attributes:
405
 
    approved:   bool(); 'None' if not yet approved/disapproved
406
 
    approval_delay: datetime.timedelta(); Time to wait for approval
407
 
    approval_duration: datetime.timedelta(); Duration of one approval
408
 
    checker:    subprocess.Popen(); a running checker process used
409
 
                                    to see if the client lives.
410
 
                                    'None' if no process is running.
411
 
    checker_callback_tag: a gobject event source tag, or None
412
 
    checker_command: string; External command which is run to check
413
 
                     if client lives.  %() expansions are done at
 
59
    name:      string; from the config file, used in log messages
 
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
61
                 uniquely identify the client
 
62
    secret:    bytestring; sent verbatim (over TLS) to client
 
63
    fqdn:      string (FQDN); available for use by the checker command
 
64
    created:   datetime.datetime()
 
65
    last_seen: datetime.datetime() or None if not yet seen
 
66
    timeout:   datetime.timedelta(); How long from last_seen until
 
67
                                     this client is invalid
 
68
    interval:  datetime.timedelta(); How often to start a new checker
 
69
    stop_hook: If set, called by stop() as stop_hook(self)
 
70
    checker:   subprocess.Popen(); a running checker process used
 
71
                                   to see if the client lives.
 
72
                                   Is None if no process is running.
 
73
    checker_initiator_tag: a gobject event source tag, or None
 
74
    stop_initiator_tag:    - '' -
 
75
    checker_callback_tag:  - '' -
 
76
    checker_command: string; External command which is run to check if
 
77
                     client lives.  %()s expansions are done at
414
78
                     runtime with vars(self) as dict, so that for
415
79
                     instance %(name)s can be used in the command.
416
 
    checker_initiator_tag: a gobject event source tag, or None
417
 
    created:    datetime.datetime(); (UTC) object creation
418
 
    client_structure: Object describing what attributes a client has
419
 
                      and is used for storing the client at exit
420
 
    current_checker_command: string; current running checker_command
421
 
    disable_initiator_tag: a gobject event source tag, or None
422
 
    enabled:    bool()
423
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
424
 
                 uniquely identify the client
425
 
    host:       string; available for use by the checker command
426
 
    interval:   datetime.timedelta(); How often to start a new checker
427
 
    last_approval_request: datetime.datetime(); (UTC) or None
428
 
    last_checked_ok: datetime.datetime(); (UTC) or None
429
 
    last_checker_status: integer between 0 and 255 reflecting exit
430
 
                         status of last checker. -1 reflects crashed
431
 
                         checker, -2 means no checker completed yet.
432
 
    last_enabled: datetime.datetime(); (UTC) or None
433
 
    name:       string; from the config file, used in log messages and
434
 
                        D-Bus identifiers
435
 
    secret:     bytestring; sent verbatim (over TLS) to client
436
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
437
 
                                      until this client is disabled
438
 
    extended_timeout:   extra long timeout when secret has been sent
439
 
    runtime_expansions: Allowed attributes for runtime expansion.
440
 
    expires:    datetime.datetime(); time (UTC) when a client will be
441
 
                disabled, or None
 
80
    Private attibutes:
 
81
    _timeout: Real variable for 'timeout'
 
82
    _interval: Real variable for 'interval'
 
83
    _timeout_milliseconds: Used by gobject.timeout_add()
 
84
    _interval_milliseconds: - '' -
442
85
    """
443
 
    
444
 
    runtime_expansions = ("approval_delay", "approval_duration",
445
 
                          "created", "enabled", "expires",
446
 
                          "fingerprint", "host", "interval",
447
 
                          "last_approval_request", "last_checked_ok",
448
 
                          "last_enabled", "name", "timeout")
449
 
    client_defaults = { "timeout": "5m",
450
 
                        "extended_timeout": "15m",
451
 
                        "interval": "2m",
452
 
                        "checker": "fping -q -- %%(host)s",
453
 
                        "host": "",
454
 
                        "approval_delay": "0s",
455
 
                        "approval_duration": "1s",
456
 
                        "approved_by_default": "True",
457
 
                        "enabled": "True",
458
 
                        }
459
 
    
460
 
    def timeout_milliseconds(self):
461
 
        "Return the 'timeout' attribute in milliseconds"
462
 
        return timedelta_to_milliseconds(self.timeout)
463
 
    
464
 
    def extended_timeout_milliseconds(self):
465
 
        "Return the 'extended_timeout' attribute in milliseconds"
466
 
        return timedelta_to_milliseconds(self.extended_timeout)
467
 
    
468
 
    def interval_milliseconds(self):
469
 
        "Return the 'interval' attribute in milliseconds"
470
 
        return timedelta_to_milliseconds(self.interval)
471
 
    
472
 
    def approval_delay_milliseconds(self):
473
 
        return timedelta_to_milliseconds(self.approval_delay)
474
 
    
475
 
    @staticmethod
476
 
    def config_parser(config):
477
 
        """Construct a new dict of client settings of this form:
478
 
        { client_name: {setting_name: value, ...}, ...}
479
 
        with exceptions for any special settings as defined above.
480
 
        NOTE: Must be a pure function. Must return the same result
481
 
        value given the same arguments.
482
 
        """
483
 
        settings = {}
484
 
        for client_name in config.sections():
485
 
            section = dict(config.items(client_name))
486
 
            client = settings[client_name] = {}
487
 
            
488
 
            client["host"] = section["host"]
489
 
            # Reformat values from string types to Python types
490
 
            client["approved_by_default"] = config.getboolean(
491
 
                client_name, "approved_by_default")
492
 
            client["enabled"] = config.getboolean(client_name,
493
 
                                                  "enabled")
494
 
            
495
 
            client["fingerprint"] = (section["fingerprint"].upper()
496
 
                                     .replace(" ", ""))
497
 
            if "secret" in section:
498
 
                client["secret"] = section["secret"].decode("base64")
499
 
            elif "secfile" in section:
500
 
                with open(os.path.expanduser(os.path.expandvars
501
 
                                             (section["secfile"])),
502
 
                          "rb") as secfile:
503
 
                    client["secret"] = secfile.read()
504
 
            else:
505
 
                raise TypeError("No secret or secfile for section {0}"
506
 
                                .format(section))
507
 
            client["timeout"] = string_to_delta(section["timeout"])
508
 
            client["extended_timeout"] = string_to_delta(
509
 
                section["extended_timeout"])
510
 
            client["interval"] = string_to_delta(section["interval"])
511
 
            client["approval_delay"] = string_to_delta(
512
 
                section["approval_delay"])
513
 
            client["approval_duration"] = string_to_delta(
514
 
                section["approval_duration"])
515
 
            client["checker_command"] = section["checker"]
516
 
            client["last_approval_request"] = None
517
 
            client["last_checked_ok"] = None
518
 
            client["last_checker_status"] = -2
519
 
        
520
 
        return settings
521
 
    
522
 
    def __init__(self, settings, name = None):
 
86
    def _set_timeout(self, timeout):
 
87
        "Setter function for 'timeout' attribute"
 
88
        self._timeout = timeout
 
89
        self._timeout_milliseconds = ((self.timeout.days
 
90
                                       * 24 * 60 * 60 * 1000)
 
91
                                      + (self.timeout.seconds * 1000)
 
92
                                      + (self.timeout.microseconds
 
93
                                         // 1000))
 
94
    timeout = property(lambda self: self._timeout,
 
95
                       _set_timeout)
 
96
    del _set_timeout
 
97
    def _set_interval(self, interval):
 
98
        "Setter function for 'interval' attribute"
 
99
        self._interval = interval
 
100
        self._interval_milliseconds = ((self.interval.days
 
101
                                        * 24 * 60 * 60 * 1000)
 
102
                                       + (self.interval.seconds
 
103
                                          * 1000)
 
104
                                       + (self.interval.microseconds
 
105
                                          // 1000))
 
106
    interval = property(lambda self: self._interval,
 
107
                        _set_interval)
 
108
    del _set_interval
 
109
    def __init__(self, name=None, options=None, stop_hook=None,
 
110
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
111
                 timeout=None, interval=-1, checker=None):
523
112
        self.name = name
524
 
        # adding all client settings
525
 
        for setting, value in settings.iteritems():
526
 
            setattr(self, setting, value)
527
 
        
528
 
        if self.enabled:
529
 
            if not hasattr(self, "last_enabled"):
530
 
                self.last_enabled = datetime.datetime.utcnow()
531
 
            if not hasattr(self, "expires"):
532
 
                self.expires = (datetime.datetime.utcnow()
533
 
                                + self.timeout)
534
 
        else:
535
 
            self.last_enabled = None
536
 
            self.expires = None
537
 
        
538
 
        logger.debug("Creating client %r", self.name)
539
 
        # Uppercase and remove spaces from fingerprint for later
540
 
        # comparison purposes with return value from the fingerprint()
541
 
        # function
542
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
543
 
        self.created = settings.get("created",
544
 
                                    datetime.datetime.utcnow())
545
 
        
546
 
        # attributes specific for this server instance
 
113
        # Uppercase and remove spaces from fingerprint
 
114
        # for later comparison purposes with return value of
 
115
        # the fingerprint() function
 
116
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
117
        if secret:
 
118
            self.secret = secret.decode(u"base64")
 
119
        elif secfile:
 
120
            sf = open(secfile)
 
121
            self.secret = sf.read()
 
122
            sf.close()
 
123
        else:
 
124
            raise RuntimeError(u"No secret or secfile for client %s"
 
125
                               % self.name)
 
126
        self.fqdn = fqdn                # string
 
127
        self.created = datetime.datetime.now()
 
128
        self.last_seen = None
 
129
        if timeout is None:
 
130
            timeout = options.timeout
 
131
        self.timeout = timeout
 
132
        if interval == -1:
 
133
            interval = options.interval
 
134
        else:
 
135
            interval = string_to_delta(interval)
 
136
        self.interval = interval
 
137
        self.stop_hook = stop_hook
547
138
        self.checker = None
548
139
        self.checker_initiator_tag = None
549
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
550
141
        self.checker_callback_tag = None
551
 
        self.current_checker_command = None
552
 
        self.approved = None
553
 
        self.approvals_pending = 0
554
 
        self.changedstate = (multiprocessing_manager
555
 
                             .Condition(multiprocessing_manager
556
 
                                        .Lock()))
557
 
        self.client_structure = [attr for attr in
558
 
                                 self.__dict__.iterkeys()
559
 
                                 if not attr.startswith("_")]
560
 
        self.client_structure.append("client_structure")
561
 
        
562
 
        for name, t in inspect.getmembers(type(self),
563
 
                                          lambda obj:
564
 
                                              isinstance(obj,
565
 
                                                         property)):
566
 
            if not name.startswith("_"):
567
 
                self.client_structure.append(name)
568
 
    
569
 
    # Send notice to process children that client state has changed
570
 
    def send_changedstate(self):
571
 
        with self.changedstate:
572
 
            self.changedstate.notify_all()
573
 
    
574
 
    def enable(self):
575
 
        """Start this client's checker and timeout hooks"""
576
 
        if getattr(self, "enabled", False):
577
 
            # Already enabled
578
 
            return
579
 
        self.expires = datetime.datetime.utcnow() + self.timeout
580
 
        self.enabled = True
581
 
        self.last_enabled = datetime.datetime.utcnow()
582
 
        self.init_checker()
583
 
        self.send_changedstate()
584
 
    
585
 
    def disable(self, quiet=True):
586
 
        """Disable this client."""
587
 
        if not getattr(self, "enabled", False):
588
 
            return False
589
 
        if not quiet:
590
 
            logger.info("Disabling client %s", self.name)
591
 
        if getattr(self, "disable_initiator_tag", None) is not None:
592
 
            gobject.source_remove(self.disable_initiator_tag)
593
 
            self.disable_initiator_tag = None
594
 
        self.expires = None
595
 
        if getattr(self, "checker_initiator_tag", None) is not None:
596
 
            gobject.source_remove(self.checker_initiator_tag)
597
 
            self.checker_initiator_tag = None
598
 
        self.stop_checker()
599
 
        self.enabled = False
600
 
        if not quiet:
601
 
            self.send_changedstate()
602
 
        # Do not run this again if called by a gobject.timeout_add
603
 
        return False
604
 
    
605
 
    def __del__(self):
606
 
        self.disable()
607
 
    
608
 
    def init_checker(self):
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
609
145
        # Schedule a new checker to be started an 'interval' from now,
610
146
        # and every interval from then on.
611
 
        if self.checker_initiator_tag is not None:
612
 
            gobject.source_remove(self.checker_initiator_tag)
613
 
        self.checker_initiator_tag = (gobject.timeout_add
614
 
                                      (self.interval_milliseconds(),
615
 
                                       self.start_checker))
616
 
        # Schedule a disable() when 'timeout' has passed
617
 
        if self.disable_initiator_tag is not None:
618
 
            gobject.source_remove(self.disable_initiator_tag)
619
 
        self.disable_initiator_tag = (gobject.timeout_add
620
 
                                   (self.timeout_milliseconds(),
621
 
                                    self.disable))
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
622
150
        # Also start a new checker *right now*.
623
151
        self.start_checker()
624
 
    
625
 
    def checker_callback(self, pid, condition, command):
 
152
        # Schedule a stop() when 'timeout' has passed
 
153
        self.stop_initiator_tag = gobject.timeout_add\
 
154
                                  (self._timeout_milliseconds,
 
155
                                   self.stop)
 
156
    def stop(self):
 
157
        """Stop this client.
 
158
        The possibility that this client might be restarted is left
 
159
        open, but not currently used."""
 
160
        logger.debug(u"Stopping client %s", self.name)
 
161
        self.secret = None
 
162
        if self.stop_initiator_tag:
 
163
            gobject.source_remove(self.stop_initiator_tag)
 
164
            self.stop_initiator_tag = None
 
165
        if self.checker_initiator_tag:
 
166
            gobject.source_remove(self.checker_initiator_tag)
 
167
            self.checker_initiator_tag = None
 
168
        self.stop_checker()
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
 
171
        # Do not run this again if called by a gobject.timeout_add
 
172
        return False
 
173
    def __del__(self):
 
174
        # Some code duplication here and in stop()
 
175
        if hasattr(self, "stop_initiator_tag") \
 
176
               and self.stop_initiator_tag:
 
177
            gobject.source_remove(self.stop_initiator_tag)
 
178
            self.stop_initiator_tag = None
 
179
        if hasattr(self, "checker_initiator_tag") \
 
180
               and self.checker_initiator_tag:
 
181
            gobject.source_remove(self.checker_initiator_tag)
 
182
            self.checker_initiator_tag = None
 
183
        self.stop_checker()
 
184
    def checker_callback(self, pid, condition):
626
185
        """The checker has completed, so take appropriate actions."""
627
 
        self.checker_callback_tag = None
628
 
        self.checker = None
629
 
        if os.WIFEXITED(condition):
630
 
            self.last_checker_status = os.WEXITSTATUS(condition)
631
 
            if self.last_checker_status == 0:
632
 
                logger.info("Checker for %(name)s succeeded",
633
 
                            vars(self))
634
 
                self.checked_ok()
635
 
            else:
636
 
                logger.info("Checker for %(name)s failed",
637
 
                            vars(self))
638
 
        else:
639
 
            self.last_checker_status = -1
640
 
            logger.warning("Checker for %(name)s crashed?",
 
186
        now = datetime.datetime.now()
 
187
        if os.WIFEXITED(condition) \
 
188
               and (os.WEXITSTATUS(condition) == 0):
 
189
            logger.debug(u"Checker for %(name)s succeeded",
 
190
                         vars(self))
 
191
            self.last_seen = now
 
192
            gobject.source_remove(self.stop_initiator_tag)
 
193
            self.stop_initiator_tag = gobject.timeout_add\
 
194
                                      (self._timeout_milliseconds,
 
195
                                       self.stop)
 
196
        if not os.WIFEXITED(condition):
 
197
            logger.warning(u"Checker for %(name)s crashed?",
641
198
                           vars(self))
642
 
    
643
 
    def checked_ok(self):
644
 
        """Assert that the client has been seen, alive and well."""
645
 
        self.last_checked_ok = datetime.datetime.utcnow()
646
 
        self.last_checker_status = 0
647
 
        self.bump_timeout()
648
 
    
649
 
    def bump_timeout(self, timeout=None):
650
 
        """Bump up the timeout for this client."""
651
 
        if timeout is None:
652
 
            timeout = self.timeout
653
 
        if self.disable_initiator_tag is not None:
654
 
            gobject.source_remove(self.disable_initiator_tag)
655
 
            self.disable_initiator_tag = None
656
 
        if getattr(self, "enabled", False):
657
 
            self.disable_initiator_tag = (gobject.timeout_add
658
 
                                          (timedelta_to_milliseconds
659
 
                                           (timeout), self.disable))
660
 
            self.expires = datetime.datetime.utcnow() + timeout
661
 
    
662
 
    def need_approval(self):
663
 
        self.last_approval_request = datetime.datetime.utcnow()
664
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
665
204
    def start_checker(self):
666
205
        """Start a new checker subprocess if one is not running.
667
 
        
668
206
        If a checker already exists, leave it running and do
669
207
        nothing."""
670
 
        # The reason for not killing a running checker is that if we
671
 
        # did that, and if a checker (for some reason) started running
672
 
        # slowly and taking more than 'interval' time, then the client
673
 
        # would inevitably timeout, since no checker would get a
674
 
        # chance to run to completion.  If we instead leave running
675
 
        # checkers alone, the checker would have to take more time
676
 
        # than 'timeout' for the client to be disabled, which is as it
677
 
        # should be.
678
 
        
679
 
        # If a checker exists, make sure it is not a zombie
680
 
        try:
681
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
682
 
        except (AttributeError, OSError) as error:
683
 
            if (isinstance(error, OSError)
684
 
                and error.errno != errno.ECHILD):
685
 
                raise error
686
 
        else:
687
 
            if pid:
688
 
                logger.warning("Checker was a zombie")
689
 
                gobject.source_remove(self.checker_callback_tag)
690
 
                self.checker_callback(pid, status,
691
 
                                      self.current_checker_command)
692
 
        # Start a new checker if needed
693
208
        if self.checker is None:
694
 
            # Escape attributes for the shell
695
 
            escaped_attrs = dict(
696
 
                (attr, re.escape(unicode(getattr(self, attr))))
697
 
                for attr in
698
 
                self.runtime_expansions)
699
 
            try:
700
 
                command = self.checker_command % escaped_attrs
701
 
            except TypeError as error:
702
 
                logger.error('Could not format string "%s"',
703
 
                             self.checker_command, exc_info=error)
704
 
                return True # Try again later
705
 
            self.current_checker_command = command
706
 
            try:
707
 
                logger.info("Starting checker %r for %s",
708
 
                            command, self.name)
709
 
                # We don't need to redirect stdout and stderr, since
710
 
                # in normal mode, that is already done by daemon(),
711
 
                # and in debug mode we don't want to.  (Stdin is
712
 
                # always replaced by /dev/null.)
713
 
                self.checker = subprocess.Popen(command,
714
 
                                                close_fds=True,
715
 
                                                shell=True, cwd="/")
716
 
            except OSError as error:
717
 
                logger.error("Failed to start subprocess",
718
 
                             exc_info=error)
719
 
            self.checker_callback_tag = (gobject.child_watch_add
720
 
                                         (self.checker.pid,
721
 
                                          self.checker_callback,
722
 
                                          data=command))
723
 
            # The checker may have completed before the gobject
724
 
            # watch was added.  Check for this.
725
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
726
 
            if pid:
727
 
                gobject.source_remove(self.checker_callback_tag)
728
 
                self.checker_callback(pid, status, command)
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
 
211
            try:
 
212
                command = self.check_command % self.fqdn
 
213
            except TypeError:
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
 
217
                try:
 
218
                    command = self.check_command % escaped_attrs
 
219
                except TypeError, error:
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
 
222
                    return True # Try again later
 
223
            try:
 
224
                self.checker = subprocess.\
 
225
                               Popen(command,
 
226
                                     stdout=subprocess.PIPE,
 
227
                                     close_fds=True, shell=True,
 
228
                                     cwd="/")
 
229
                self.checker_callback_tag = gobject.\
 
230
                                            child_watch_add(self.checker.pid,
 
231
                                                            self.\
 
232
                                                            checker_callback)
 
233
            except subprocess.OSError, error:
 
234
                logger.error(u"Failed to start subprocess: %s",
 
235
                             error)
729
236
        # Re-run this periodically if run by gobject.timeout_add
730
237
        return True
731
 
    
732
238
    def stop_checker(self):
733
239
        """Force the checker process, if any, to stop."""
734
 
        if self.checker_callback_tag:
735
 
            gobject.source_remove(self.checker_callback_tag)
736
 
            self.checker_callback_tag = None
737
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
738
241
            return
739
 
        logger.debug("Stopping checker for %(name)s", vars(self))
740
 
        try:
741
 
            self.checker.terminate()
742
 
            #time.sleep(0.5)
743
 
            #if self.checker.poll() is None:
744
 
            #    self.checker.kill()
745
 
        except OSError as error:
746
 
            if error.errno != errno.ESRCH: # No such process
747
 
                raise
748
 
        self.checker = None
749
 
 
750
 
 
751
 
def dbus_service_property(dbus_interface, signature="v",
752
 
                          access="readwrite", byte_arrays=False):
753
 
    """Decorators for marking methods of a DBusObjectWithProperties to
754
 
    become properties on the D-Bus.
755
 
    
756
 
    The decorated method will be called with no arguments by "Get"
757
 
    and with one argument by "Set".
758
 
    
759
 
    The parameters, where they are supported, are the same as
760
 
    dbus.service.method, except there is only "signature", since the
761
 
    type from Get() and the type sent to Set() is the same.
762
 
    """
763
 
    # Encoding deeply encoded byte arrays is not supported yet by the
764
 
    # "Set" method, so we fail early here:
765
 
    if byte_arrays and signature != "ay":
766
 
        raise ValueError("Byte arrays not supported for non-'ay'"
767
 
                         " signature {0!r}".format(signature))
768
 
    def decorator(func):
769
 
        func._dbus_is_property = True
770
 
        func._dbus_interface = dbus_interface
771
 
        func._dbus_signature = signature
772
 
        func._dbus_access = access
773
 
        func._dbus_name = func.__name__
774
 
        if func._dbus_name.endswith("_dbus_property"):
775
 
            func._dbus_name = func._dbus_name[:-14]
776
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
777
 
        return func
778
 
    return decorator
779
 
 
780
 
 
781
 
def dbus_interface_annotations(dbus_interface):
782
 
    """Decorator for marking functions returning interface annotations
783
 
    
784
 
    Usage:
785
 
    
786
 
    @dbus_interface_annotations("org.example.Interface")
787
 
    def _foo(self):  # Function name does not matter
788
 
        return {"org.freedesktop.DBus.Deprecated": "true",
789
 
                "org.freedesktop.DBus.Property.EmitsChangedSignal":
790
 
                    "false"}
791
 
    """
792
 
    def decorator(func):
793
 
        func._dbus_is_interface = True
794
 
        func._dbus_interface = dbus_interface
795
 
        func._dbus_name = dbus_interface
796
 
        return func
797
 
    return decorator
798
 
 
799
 
 
800
 
def dbus_annotations(annotations):
801
 
    """Decorator to annotate D-Bus methods, signals or properties
802
 
    Usage:
803
 
    
804
 
    @dbus_service_property("org.example.Interface", signature="b",
805
 
                           access="r")
806
 
    @dbus_annotations({{"org.freedesktop.DBus.Deprecated": "true",
807
 
                        "org.freedesktop.DBus.Property."
808
 
                        "EmitsChangedSignal": "false"})
809
 
    def Property_dbus_property(self):
810
 
        return dbus.Boolean(False)
811
 
    """
812
 
    def decorator(func):
813
 
        func._dbus_annotations = annotations
814
 
        return func
815
 
    return decorator
816
 
 
817
 
 
818
 
class DBusPropertyException(dbus.exceptions.DBusException):
819
 
    """A base class for D-Bus property-related exceptions
820
 
    """
821
 
    def __unicode__(self):
822
 
        return unicode(str(self))
823
 
 
824
 
 
825
 
class DBusPropertyAccessException(DBusPropertyException):
826
 
    """A property's access permissions disallows an operation.
827
 
    """
828
 
    pass
829
 
 
830
 
 
831
 
class DBusPropertyNotFound(DBusPropertyException):
832
 
    """An attempt was made to access a non-existing property.
833
 
    """
834
 
    pass
835
 
 
836
 
 
837
 
class DBusObjectWithProperties(dbus.service.Object):
838
 
    """A D-Bus object with properties.
839
 
    
840
 
    Classes inheriting from this can use the dbus_service_property
841
 
    decorator to expose methods as D-Bus properties.  It exposes the
842
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
843
 
    """
844
 
    
845
 
    @staticmethod
846
 
    def _is_dbus_thing(thing):
847
 
        """Returns a function testing if an attribute is a D-Bus thing
848
 
        
849
 
        If called like _is_dbus_thing("method") it returns a function
850
 
        suitable for use as predicate to inspect.getmembers().
851
 
        """
852
 
        return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),
853
 
                                   False)
854
 
    
855
 
    def _get_all_dbus_things(self, thing):
856
 
        """Returns a generator of (name, attribute) pairs
857
 
        """
858
 
        return ((getattr(athing.__get__(self), "_dbus_name",
859
 
                         name),
860
 
                 athing.__get__(self))
861
 
                for cls in self.__class__.__mro__
862
 
                for name, athing in
863
 
                inspect.getmembers(cls,
864
 
                                   self._is_dbus_thing(thing)))
865
 
    
866
 
    def _get_dbus_property(self, interface_name, property_name):
867
 
        """Returns a bound method if one exists which is a D-Bus
868
 
        property with the specified name and interface.
869
 
        """
870
 
        for cls in  self.__class__.__mro__:
871
 
            for name, value in (inspect.getmembers
872
 
                                (cls,
873
 
                                 self._is_dbus_thing("property"))):
874
 
                if (value._dbus_name == property_name
875
 
                    and value._dbus_interface == interface_name):
876
 
                    return value.__get__(self)
877
 
        
878
 
        # No such property
879
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
880
 
                                   + interface_name + "."
881
 
                                   + property_name)
882
 
    
883
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
884
 
                         out_signature="v")
885
 
    def Get(self, interface_name, property_name):
886
 
        """Standard D-Bus property Get() method, see D-Bus standard.
887
 
        """
888
 
        prop = self._get_dbus_property(interface_name, property_name)
889
 
        if prop._dbus_access == "write":
890
 
            raise DBusPropertyAccessException(property_name)
891
 
        value = prop()
892
 
        if not hasattr(value, "variant_level"):
893
 
            return value
894
 
        return type(value)(value, variant_level=value.variant_level+1)
895
 
    
896
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
897
 
    def Set(self, interface_name, property_name, value):
898
 
        """Standard D-Bus property Set() method, see D-Bus standard.
899
 
        """
900
 
        prop = self._get_dbus_property(interface_name, property_name)
901
 
        if prop._dbus_access == "read":
902
 
            raise DBusPropertyAccessException(property_name)
903
 
        if prop._dbus_get_args_options["byte_arrays"]:
904
 
            # The byte_arrays option is not supported yet on
905
 
            # signatures other than "ay".
906
 
            if prop._dbus_signature != "ay":
907
 
                raise ValueError
908
 
            value = dbus.ByteArray(b''.join(chr(byte)
909
 
                                            for byte in value))
910
 
        prop(value)
911
 
    
912
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
913
 
                         out_signature="a{sv}")
914
 
    def GetAll(self, interface_name):
915
 
        """Standard D-Bus property GetAll() method, see D-Bus
916
 
        standard.
917
 
        
918
 
        Note: Will not include properties with access="write".
919
 
        """
920
 
        properties = {}
921
 
        for name, prop in self._get_all_dbus_things("property"):
922
 
            if (interface_name
923
 
                and interface_name != prop._dbus_interface):
924
 
                # Interface non-empty but did not match
925
 
                continue
926
 
            # Ignore write-only properties
927
 
            if prop._dbus_access == "write":
928
 
                continue
929
 
            value = prop()
930
 
            if not hasattr(value, "variant_level"):
931
 
                properties[name] = value
932
 
                continue
933
 
            properties[name] = type(value)(value, variant_level=
934
 
                                           value.variant_level+1)
935
 
        return dbus.Dictionary(properties, signature="sv")
936
 
    
937
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
938
 
                         out_signature="s",
939
 
                         path_keyword='object_path',
940
 
                         connection_keyword='connection')
941
 
    def Introspect(self, object_path, connection):
942
 
        """Overloading of standard D-Bus method.
943
 
        
944
 
        Inserts property tags and interface annotation tags.
945
 
        """
946
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
947
 
                                                   connection)
948
 
        try:
949
 
            document = xml.dom.minidom.parseString(xmlstring)
950
 
            def make_tag(document, name, prop):
951
 
                e = document.createElement("property")
952
 
                e.setAttribute("name", name)
953
 
                e.setAttribute("type", prop._dbus_signature)
954
 
                e.setAttribute("access", prop._dbus_access)
955
 
                return e
956
 
            for if_tag in document.getElementsByTagName("interface"):
957
 
                # Add property tags
958
 
                for tag in (make_tag(document, name, prop)
959
 
                            for name, prop
960
 
                            in self._get_all_dbus_things("property")
961
 
                            if prop._dbus_interface
962
 
                            == if_tag.getAttribute("name")):
963
 
                    if_tag.appendChild(tag)
964
 
                # Add annotation tags
965
 
                for typ in ("method", "signal", "property"):
966
 
                    for tag in if_tag.getElementsByTagName(typ):
967
 
                        annots = dict()
968
 
                        for name, prop in (self.
969
 
                                           _get_all_dbus_things(typ)):
970
 
                            if (name == tag.getAttribute("name")
971
 
                                and prop._dbus_interface
972
 
                                == if_tag.getAttribute("name")):
973
 
                                annots.update(getattr
974
 
                                              (prop,
975
 
                                               "_dbus_annotations",
976
 
                                               {}))
977
 
                        for name, value in annots.iteritems():
978
 
                            ann_tag = document.createElement(
979
 
                                "annotation")
980
 
                            ann_tag.setAttribute("name", name)
981
 
                            ann_tag.setAttribute("value", value)
982
 
                            tag.appendChild(ann_tag)
983
 
                # Add interface annotation tags
984
 
                for annotation, value in dict(
985
 
                    itertools.chain.from_iterable(
986
 
                        annotations().iteritems()
987
 
                        for name, annotations in
988
 
                        self._get_all_dbus_things("interface")
989
 
                        if name == if_tag.getAttribute("name")
990
 
                        )).iteritems():
991
 
                    ann_tag = document.createElement("annotation")
992
 
                    ann_tag.setAttribute("name", annotation)
993
 
                    ann_tag.setAttribute("value", value)
994
 
                    if_tag.appendChild(ann_tag)
995
 
                # Add the names to the return values for the
996
 
                # "org.freedesktop.DBus.Properties" methods
997
 
                if (if_tag.getAttribute("name")
998
 
                    == "org.freedesktop.DBus.Properties"):
999
 
                    for cn in if_tag.getElementsByTagName("method"):
1000
 
                        if cn.getAttribute("name") == "Get":
1001
 
                            for arg in cn.getElementsByTagName("arg"):
1002
 
                                if (arg.getAttribute("direction")
1003
 
                                    == "out"):
1004
 
                                    arg.setAttribute("name", "value")
1005
 
                        elif cn.getAttribute("name") == "GetAll":
1006
 
                            for arg in cn.getElementsByTagName("arg"):
1007
 
                                if (arg.getAttribute("direction")
1008
 
                                    == "out"):
1009
 
                                    arg.setAttribute("name", "props")
1010
 
            xmlstring = document.toxml("utf-8")
1011
 
            document.unlink()
1012
 
        except (AttributeError, xml.dom.DOMException,
1013
 
                xml.parsers.expat.ExpatError) as error:
1014
 
            logger.error("Failed to override Introspection method",
1015
 
                         exc_info=error)
1016
 
        return xmlstring
1017
 
 
1018
 
 
1019
 
def datetime_to_dbus(dt, variant_level=0):
1020
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
1021
 
    if dt is None:
1022
 
        return dbus.String("", variant_level = variant_level)
1023
 
    return dbus.String(dt.isoformat(),
1024
 
                       variant_level=variant_level)
1025
 
 
1026
 
 
1027
 
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1028
 
    """A class decorator; applied to a subclass of
1029
 
    dbus.service.Object, it will add alternate D-Bus attributes with
1030
 
    interface names according to the "alt_interface_names" mapping.
1031
 
    Usage:
1032
 
    
1033
 
    @alternate_dbus_interfaces({"org.example.Interface":
1034
 
                                    "net.example.AlternateInterface"})
1035
 
    class SampleDBusObject(dbus.service.Object):
1036
 
        @dbus.service.method("org.example.Interface")
1037
 
        def SampleDBusMethod():
1038
 
            pass
1039
 
    
1040
 
    The above "SampleDBusMethod" on "SampleDBusObject" will be
1041
 
    reachable via two interfaces: "org.example.Interface" and
1042
 
    "net.example.AlternateInterface", the latter of which will have
1043
 
    its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1044
 
    "true", unless "deprecate" is passed with a False value.
1045
 
    
1046
 
    This works for methods and signals, and also for D-Bus properties
1047
 
    (from DBusObjectWithProperties) and interfaces (from the
1048
 
    dbus_interface_annotations decorator).
1049
 
    """
1050
 
    def wrapper(cls):
1051
 
        for orig_interface_name, alt_interface_name in (
1052
 
            alt_interface_names.iteritems()):
1053
 
            attr = {}
1054
 
            interface_names = set()
1055
 
            # Go though all attributes of the class
1056
 
            for attrname, attribute in inspect.getmembers(cls):
1057
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
1058
 
                # with the wrong interface name
1059
 
                if (not hasattr(attribute, "_dbus_interface")
1060
 
                    or not attribute._dbus_interface
1061
 
                    .startswith(orig_interface_name)):
1062
 
                    continue
1063
 
                # Create an alternate D-Bus interface name based on
1064
 
                # the current name
1065
 
                alt_interface = (attribute._dbus_interface
1066
 
                                 .replace(orig_interface_name,
1067
 
                                          alt_interface_name))
1068
 
                interface_names.add(alt_interface)
1069
 
                # Is this a D-Bus signal?
1070
 
                if getattr(attribute, "_dbus_is_signal", False):
1071
 
                    # Extract the original non-method function by
1072
 
                    # black magic
1073
 
                    nonmethod_func = (dict(
1074
 
                            zip(attribute.func_code.co_freevars,
1075
 
                                attribute.__closure__))["func"]
1076
 
                                      .cell_contents)
1077
 
                    # Create a new, but exactly alike, function
1078
 
                    # object, and decorate it to be a new D-Bus signal
1079
 
                    # with the alternate D-Bus interface name
1080
 
                    new_function = (dbus.service.signal
1081
 
                                    (alt_interface,
1082
 
                                     attribute._dbus_signature)
1083
 
                                    (types.FunctionType(
1084
 
                                nonmethod_func.func_code,
1085
 
                                nonmethod_func.func_globals,
1086
 
                                nonmethod_func.func_name,
1087
 
                                nonmethod_func.func_defaults,
1088
 
                                nonmethod_func.func_closure)))
1089
 
                    # Copy annotations, if any
1090
 
                    try:
1091
 
                        new_function._dbus_annotations = (
1092
 
                            dict(attribute._dbus_annotations))
1093
 
                    except AttributeError:
1094
 
                        pass
1095
 
                    # Define a creator of a function to call both the
1096
 
                    # original and alternate functions, so both the
1097
 
                    # original and alternate signals gets sent when
1098
 
                    # the function is called
1099
 
                    def fixscope(func1, func2):
1100
 
                        """This function is a scope container to pass
1101
 
                        func1 and func2 to the "call_both" function
1102
 
                        outside of its arguments"""
1103
 
                        def call_both(*args, **kwargs):
1104
 
                            """This function will emit two D-Bus
1105
 
                            signals by calling func1 and func2"""
1106
 
                            func1(*args, **kwargs)
1107
 
                            func2(*args, **kwargs)
1108
 
                        return call_both
1109
 
                    # Create the "call_both" function and add it to
1110
 
                    # the class
1111
 
                    attr[attrname] = fixscope(attribute, new_function)
1112
 
                # Is this a D-Bus method?
1113
 
                elif getattr(attribute, "_dbus_is_method", False):
1114
 
                    # Create a new, but exactly alike, function
1115
 
                    # object.  Decorate it to be a new D-Bus method
1116
 
                    # with the alternate D-Bus interface name.  Add it
1117
 
                    # to the class.
1118
 
                    attr[attrname] = (dbus.service.method
1119
 
                                      (alt_interface,
1120
 
                                       attribute._dbus_in_signature,
1121
 
                                       attribute._dbus_out_signature)
1122
 
                                      (types.FunctionType
1123
 
                                       (attribute.func_code,
1124
 
                                        attribute.func_globals,
1125
 
                                        attribute.func_name,
1126
 
                                        attribute.func_defaults,
1127
 
                                        attribute.func_closure)))
1128
 
                    # Copy annotations, if any
1129
 
                    try:
1130
 
                        attr[attrname]._dbus_annotations = (
1131
 
                            dict(attribute._dbus_annotations))
1132
 
                    except AttributeError:
1133
 
                        pass
1134
 
                # Is this a D-Bus property?
1135
 
                elif getattr(attribute, "_dbus_is_property", False):
1136
 
                    # Create a new, but exactly alike, function
1137
 
                    # object, and decorate it to be a new D-Bus
1138
 
                    # property with the alternate D-Bus interface
1139
 
                    # name.  Add it to the class.
1140
 
                    attr[attrname] = (dbus_service_property
1141
 
                                      (alt_interface,
1142
 
                                       attribute._dbus_signature,
1143
 
                                       attribute._dbus_access,
1144
 
                                       attribute
1145
 
                                       ._dbus_get_args_options
1146
 
                                       ["byte_arrays"])
1147
 
                                      (types.FunctionType
1148
 
                                       (attribute.func_code,
1149
 
                                        attribute.func_globals,
1150
 
                                        attribute.func_name,
1151
 
                                        attribute.func_defaults,
1152
 
                                        attribute.func_closure)))
1153
 
                    # Copy annotations, if any
1154
 
                    try:
1155
 
                        attr[attrname]._dbus_annotations = (
1156
 
                            dict(attribute._dbus_annotations))
1157
 
                    except AttributeError:
1158
 
                        pass
1159
 
                # Is this a D-Bus interface?
1160
 
                elif getattr(attribute, "_dbus_is_interface", False):
1161
 
                    # Create a new, but exactly alike, function
1162
 
                    # object.  Decorate it to be a new D-Bus interface
1163
 
                    # with the alternate D-Bus interface name.  Add it
1164
 
                    # to the class.
1165
 
                    attr[attrname] = (dbus_interface_annotations
1166
 
                                      (alt_interface)
1167
 
                                      (types.FunctionType
1168
 
                                       (attribute.func_code,
1169
 
                                        attribute.func_globals,
1170
 
                                        attribute.func_name,
1171
 
                                        attribute.func_defaults,
1172
 
                                        attribute.func_closure)))
1173
 
            if deprecate:
1174
 
                # Deprecate all alternate interfaces
1175
 
                iname="_AlternateDBusNames_interface_annotation{0}"
1176
 
                for interface_name in interface_names:
1177
 
                    @dbus_interface_annotations(interface_name)
1178
 
                    def func(self):
1179
 
                        return { "org.freedesktop.DBus.Deprecated":
1180
 
                                     "true" }
1181
 
                    # Find an unused name
1182
 
                    for aname in (iname.format(i)
1183
 
                                  for i in itertools.count()):
1184
 
                        if aname not in attr:
1185
 
                            attr[aname] = func
1186
 
                            break
1187
 
            if interface_names:
1188
 
                # Replace the class with a new subclass of it with
1189
 
                # methods, signals, etc. as created above.
1190
 
                cls = type(b"{0}Alternate".format(cls.__name__),
1191
 
                           (cls,), attr)
1192
 
        return cls
1193
 
    return wrapper
1194
 
 
1195
 
 
1196
 
@alternate_dbus_interfaces({"se.recompile.Mandos":
1197
 
                                "se.bsnet.fukt.Mandos"})
1198
 
class ClientDBus(Client, DBusObjectWithProperties):
1199
 
    """A Client class using D-Bus
1200
 
    
1201
 
    Attributes:
1202
 
    dbus_object_path: dbus.ObjectPath
1203
 
    bus: dbus.SystemBus()
1204
 
    """
1205
 
    
1206
 
    runtime_expansions = (Client.runtime_expansions
1207
 
                          + ("dbus_object_path",))
1208
 
    
1209
 
    # dbus.service.Object doesn't use super(), so we can't either.
1210
 
    
1211
 
    def __init__(self, bus = None, *args, **kwargs):
1212
 
        self.bus = bus
1213
 
        Client.__init__(self, *args, **kwargs)
1214
 
        # Only now, when this client is initialized, can it show up on
1215
 
        # the D-Bus
1216
 
        client_object_name = unicode(self.name).translate(
1217
 
            {ord("."): ord("_"),
1218
 
             ord("-"): ord("_")})
1219
 
        self.dbus_object_path = (dbus.ObjectPath
1220
 
                                 ("/clients/" + client_object_name))
1221
 
        DBusObjectWithProperties.__init__(self, self.bus,
1222
 
                                          self.dbus_object_path)
1223
 
    
1224
 
    def notifychangeproperty(transform_func,
1225
 
                             dbus_name, type_func=lambda x: x,
1226
 
                             variant_level=1):
1227
 
        """ Modify a variable so that it's a property which announces
1228
 
        its changes to DBus.
1229
 
        
1230
 
        transform_fun: Function that takes a value and a variant_level
1231
 
                       and transforms it to a D-Bus type.
1232
 
        dbus_name: D-Bus name of the variable
1233
 
        type_func: Function that transform the value before sending it
1234
 
                   to the D-Bus.  Default: no transform
1235
 
        variant_level: D-Bus variant level.  Default: 1
1236
 
        """
1237
 
        attrname = "_{0}".format(dbus_name)
1238
 
        def setter(self, value):
1239
 
            if hasattr(self, "dbus_object_path"):
1240
 
                if (not hasattr(self, attrname) or
1241
 
                    type_func(getattr(self, attrname, None))
1242
 
                    != type_func(value)):
1243
 
                    dbus_value = transform_func(type_func(value),
1244
 
                                                variant_level
1245
 
                                                =variant_level)
1246
 
                    self.PropertyChanged(dbus.String(dbus_name),
1247
 
                                         dbus_value)
1248
 
            setattr(self, attrname, value)
1249
 
        
1250
 
        return property(lambda self: getattr(self, attrname), setter)
1251
 
    
1252
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1253
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1254
 
                                             "ApprovalPending",
1255
 
                                             type_func = bool)
1256
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1257
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1258
 
                                        "LastEnabled")
1259
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1260
 
                                   type_func = lambda checker:
1261
 
                                       checker is not None)
1262
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1263
 
                                           "LastCheckedOK")
1264
 
    last_checker_status = notifychangeproperty(dbus.Int16,
1265
 
                                               "LastCheckerStatus")
1266
 
    last_approval_request = notifychangeproperty(
1267
 
        datetime_to_dbus, "LastApprovalRequest")
1268
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1269
 
                                               "ApprovedByDefault")
1270
 
    approval_delay = notifychangeproperty(dbus.UInt64,
1271
 
                                          "ApprovalDelay",
1272
 
                                          type_func =
1273
 
                                          timedelta_to_milliseconds)
1274
 
    approval_duration = notifychangeproperty(
1275
 
        dbus.UInt64, "ApprovalDuration",
1276
 
        type_func = timedelta_to_milliseconds)
1277
 
    host = notifychangeproperty(dbus.String, "Host")
1278
 
    timeout = notifychangeproperty(dbus.UInt64, "Timeout",
1279
 
                                   type_func =
1280
 
                                   timedelta_to_milliseconds)
1281
 
    extended_timeout = notifychangeproperty(
1282
 
        dbus.UInt64, "ExtendedTimeout",
1283
 
        type_func = timedelta_to_milliseconds)
1284
 
    interval = notifychangeproperty(dbus.UInt64,
1285
 
                                    "Interval",
1286
 
                                    type_func =
1287
 
                                    timedelta_to_milliseconds)
1288
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1289
 
    
1290
 
    del notifychangeproperty
1291
 
    
1292
 
    def __del__(self, *args, **kwargs):
1293
 
        try:
1294
 
            self.remove_from_connection()
1295
 
        except LookupError:
1296
 
            pass
1297
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1298
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1299
 
        Client.__del__(self, *args, **kwargs)
1300
 
    
1301
 
    def checker_callback(self, pid, condition, command,
1302
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
1303
243
        self.checker_callback_tag = None
 
244
        os.kill(self.checker.pid, signal.SIGTERM)
 
245
        if self.checker.poll() is None:
 
246
            os.kill(self.checker.pid, signal.SIGKILL)
1304
247
        self.checker = None
1305
 
        if os.WIFEXITED(condition):
1306
 
            exitstatus = os.WEXITSTATUS(condition)
1307
 
            # Emit D-Bus signal
1308
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1309
 
                                  dbus.Int64(condition),
1310
 
                                  dbus.String(command))
1311
 
        else:
1312
 
            # Emit D-Bus signal
1313
 
            self.CheckerCompleted(dbus.Int16(-1),
1314
 
                                  dbus.Int64(condition),
1315
 
                                  dbus.String(command))
1316
 
        
1317
 
        return Client.checker_callback(self, pid, condition, command,
1318
 
                                       *args, **kwargs)
1319
 
    
1320
 
    def start_checker(self, *args, **kwargs):
1321
 
        old_checker = self.checker
1322
 
        if self.checker is not None:
1323
 
            old_checker_pid = self.checker.pid
1324
 
        else:
1325
 
            old_checker_pid = None
1326
 
        r = Client.start_checker(self, *args, **kwargs)
1327
 
        # Only if new checker process was started
1328
 
        if (self.checker is not None
1329
 
            and old_checker_pid != self.checker.pid):
1330
 
            # Emit D-Bus signal
1331
 
            self.CheckerStarted(self.current_checker_command)
1332
 
        return r
1333
 
    
1334
 
    def _reset_approved(self):
1335
 
        self.approved = None
1336
 
        return False
1337
 
    
1338
 
    def approve(self, value=True):
1339
 
        self.approved = value
1340
 
        gobject.timeout_add(timedelta_to_milliseconds
1341
 
                            (self.approval_duration),
1342
 
                            self._reset_approved)
1343
 
        self.send_changedstate()
1344
 
    
1345
 
    ## D-Bus methods, signals & properties
1346
 
    _interface = "se.recompile.Mandos.Client"
1347
 
    
1348
 
    ## Interfaces
1349
 
    
1350
 
    @dbus_interface_annotations(_interface)
1351
 
    def _foo(self):
1352
 
        return { "org.freedesktop.DBus.Property.EmitsChangedSignal":
1353
 
                     "false"}
1354
 
    
1355
 
    ## Signals
1356
 
    
1357
 
    # CheckerCompleted - signal
1358
 
    @dbus.service.signal(_interface, signature="nxs")
1359
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1360
 
        "D-Bus signal"
1361
 
        pass
1362
 
    
1363
 
    # CheckerStarted - signal
1364
 
    @dbus.service.signal(_interface, signature="s")
1365
 
    def CheckerStarted(self, command):
1366
 
        "D-Bus signal"
1367
 
        pass
1368
 
    
1369
 
    # PropertyChanged - signal
1370
 
    @dbus.service.signal(_interface, signature="sv")
1371
 
    def PropertyChanged(self, property, value):
1372
 
        "D-Bus signal"
1373
 
        pass
1374
 
    
1375
 
    # GotSecret - signal
1376
 
    @dbus.service.signal(_interface)
1377
 
    def GotSecret(self):
1378
 
        """D-Bus signal
1379
 
        Is sent after a successful transfer of secret from the Mandos
1380
 
        server to mandos-client
1381
 
        """
1382
 
        pass
1383
 
    
1384
 
    # Rejected - signal
1385
 
    @dbus.service.signal(_interface, signature="s")
1386
 
    def Rejected(self, reason):
1387
 
        "D-Bus signal"
1388
 
        pass
1389
 
    
1390
 
    # NeedApproval - signal
1391
 
    @dbus.service.signal(_interface, signature="tb")
1392
 
    def NeedApproval(self, timeout, default):
1393
 
        "D-Bus signal"
1394
 
        return self.need_approval()
1395
 
    
1396
 
    ## Methods
1397
 
    
1398
 
    # Approve - method
1399
 
    @dbus.service.method(_interface, in_signature="b")
1400
 
    def Approve(self, value):
1401
 
        self.approve(value)
1402
 
    
1403
 
    # CheckedOK - method
1404
 
    @dbus.service.method(_interface)
1405
 
    def CheckedOK(self):
1406
 
        self.checked_ok()
1407
 
    
1408
 
    # Enable - method
1409
 
    @dbus.service.method(_interface)
1410
 
    def Enable(self):
1411
 
        "D-Bus method"
1412
 
        self.enable()
1413
 
    
1414
 
    # StartChecker - method
1415
 
    @dbus.service.method(_interface)
1416
 
    def StartChecker(self):
1417
 
        "D-Bus method"
1418
 
        self.start_checker()
1419
 
    
1420
 
    # Disable - method
1421
 
    @dbus.service.method(_interface)
1422
 
    def Disable(self):
1423
 
        "D-Bus method"
1424
 
        self.disable()
1425
 
    
1426
 
    # StopChecker - method
1427
 
    @dbus.service.method(_interface)
1428
 
    def StopChecker(self):
1429
 
        self.stop_checker()
1430
 
    
1431
 
    ## Properties
1432
 
    
1433
 
    # ApprovalPending - property
1434
 
    @dbus_service_property(_interface, signature="b", access="read")
1435
 
    def ApprovalPending_dbus_property(self):
1436
 
        return dbus.Boolean(bool(self.approvals_pending))
1437
 
    
1438
 
    # ApprovedByDefault - property
1439
 
    @dbus_service_property(_interface, signature="b",
1440
 
                           access="readwrite")
1441
 
    def ApprovedByDefault_dbus_property(self, value=None):
1442
 
        if value is None:       # get
1443
 
            return dbus.Boolean(self.approved_by_default)
1444
 
        self.approved_by_default = bool(value)
1445
 
    
1446
 
    # ApprovalDelay - property
1447
 
    @dbus_service_property(_interface, signature="t",
1448
 
                           access="readwrite")
1449
 
    def ApprovalDelay_dbus_property(self, value=None):
1450
 
        if value is None:       # get
1451
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1452
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1453
 
    
1454
 
    # ApprovalDuration - property
1455
 
    @dbus_service_property(_interface, signature="t",
1456
 
                           access="readwrite")
1457
 
    def ApprovalDuration_dbus_property(self, value=None):
1458
 
        if value is None:       # get
1459
 
            return dbus.UInt64(timedelta_to_milliseconds(
1460
 
                    self.approval_duration))
1461
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1462
 
    
1463
 
    # Name - property
1464
 
    @dbus_service_property(_interface, signature="s", access="read")
1465
 
    def Name_dbus_property(self):
1466
 
        return dbus.String(self.name)
1467
 
    
1468
 
    # Fingerprint - property
1469
 
    @dbus_service_property(_interface, signature="s", access="read")
1470
 
    def Fingerprint_dbus_property(self):
1471
 
        return dbus.String(self.fingerprint)
1472
 
    
1473
 
    # Host - property
1474
 
    @dbus_service_property(_interface, signature="s",
1475
 
                           access="readwrite")
1476
 
    def Host_dbus_property(self, value=None):
1477
 
        if value is None:       # get
1478
 
            return dbus.String(self.host)
1479
 
        self.host = unicode(value)
1480
 
    
1481
 
    # Created - property
1482
 
    @dbus_service_property(_interface, signature="s", access="read")
1483
 
    def Created_dbus_property(self):
1484
 
        return datetime_to_dbus(self.created)
1485
 
    
1486
 
    # LastEnabled - property
1487
 
    @dbus_service_property(_interface, signature="s", access="read")
1488
 
    def LastEnabled_dbus_property(self):
1489
 
        return datetime_to_dbus(self.last_enabled)
1490
 
    
1491
 
    # Enabled - property
1492
 
    @dbus_service_property(_interface, signature="b",
1493
 
                           access="readwrite")
1494
 
    def Enabled_dbus_property(self, value=None):
1495
 
        if value is None:       # get
1496
 
            return dbus.Boolean(self.enabled)
1497
 
        if value:
1498
 
            self.enable()
1499
 
        else:
1500
 
            self.disable()
1501
 
    
1502
 
    # LastCheckedOK - property
1503
 
    @dbus_service_property(_interface, signature="s",
1504
 
                           access="readwrite")
1505
 
    def LastCheckedOK_dbus_property(self, value=None):
1506
 
        if value is not None:
1507
 
            self.checked_ok()
1508
 
            return
1509
 
        return datetime_to_dbus(self.last_checked_ok)
1510
 
    
1511
 
    # LastCheckerStatus - property
1512
 
    @dbus_service_property(_interface, signature="n",
1513
 
                           access="read")
1514
 
    def LastCheckerStatus_dbus_property(self):
1515
 
        return dbus.Int16(self.last_checker_status)
1516
 
    
1517
 
    # Expires - property
1518
 
    @dbus_service_property(_interface, signature="s", access="read")
1519
 
    def Expires_dbus_property(self):
1520
 
        return datetime_to_dbus(self.expires)
1521
 
    
1522
 
    # LastApprovalRequest - property
1523
 
    @dbus_service_property(_interface, signature="s", access="read")
1524
 
    def LastApprovalRequest_dbus_property(self):
1525
 
        return datetime_to_dbus(self.last_approval_request)
1526
 
    
1527
 
    # Timeout - property
1528
 
    @dbus_service_property(_interface, signature="t",
1529
 
                           access="readwrite")
1530
 
    def Timeout_dbus_property(self, value=None):
1531
 
        if value is None:       # get
1532
 
            return dbus.UInt64(self.timeout_milliseconds())
1533
 
        old_timeout = self.timeout
1534
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1535
 
        # Reschedule disabling
1536
 
        if self.enabled:
1537
 
            now = datetime.datetime.utcnow()
1538
 
            self.expires += self.timeout - old_timeout
1539
 
            if self.expires <= now:
1540
 
                # The timeout has passed
1541
 
                self.disable()
1542
 
            else:
1543
 
                if (getattr(self, "disable_initiator_tag", None)
1544
 
                    is None):
1545
 
                    return
1546
 
                gobject.source_remove(self.disable_initiator_tag)
1547
 
                self.disable_initiator_tag = (
1548
 
                    gobject.timeout_add(
1549
 
                        timedelta_to_milliseconds(self.expires - now),
1550
 
                        self.disable))
1551
 
    
1552
 
    # ExtendedTimeout - property
1553
 
    @dbus_service_property(_interface, signature="t",
1554
 
                           access="readwrite")
1555
 
    def ExtendedTimeout_dbus_property(self, value=None):
1556
 
        if value is None:       # get
1557
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1558
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1559
 
    
1560
 
    # Interval - property
1561
 
    @dbus_service_property(_interface, signature="t",
1562
 
                           access="readwrite")
1563
 
    def Interval_dbus_property(self, value=None):
1564
 
        if value is None:       # get
1565
 
            return dbus.UInt64(self.interval_milliseconds())
1566
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1567
 
        if getattr(self, "checker_initiator_tag", None) is None:
1568
 
            return
1569
 
        if self.enabled:
1570
 
            # Reschedule checker run
1571
 
            gobject.source_remove(self.checker_initiator_tag)
1572
 
            self.checker_initiator_tag = (gobject.timeout_add
1573
 
                                          (value, self.start_checker))
1574
 
            self.start_checker()    # Start one now, too
1575
 
    
1576
 
    # Checker - property
1577
 
    @dbus_service_property(_interface, signature="s",
1578
 
                           access="readwrite")
1579
 
    def Checker_dbus_property(self, value=None):
1580
 
        if value is None:       # get
1581
 
            return dbus.String(self.checker_command)
1582
 
        self.checker_command = unicode(value)
1583
 
    
1584
 
    # CheckerRunning - property
1585
 
    @dbus_service_property(_interface, signature="b",
1586
 
                           access="readwrite")
1587
 
    def CheckerRunning_dbus_property(self, value=None):
1588
 
        if value is None:       # get
1589
 
            return dbus.Boolean(self.checker is not None)
1590
 
        if value:
1591
 
            self.start_checker()
1592
 
        else:
1593
 
            self.stop_checker()
1594
 
    
1595
 
    # ObjectPath - property
1596
 
    @dbus_service_property(_interface, signature="o", access="read")
1597
 
    def ObjectPath_dbus_property(self):
1598
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1599
 
    
1600
 
    # Secret = property
1601
 
    @dbus_service_property(_interface, signature="ay",
1602
 
                           access="write", byte_arrays=True)
1603
 
    def Secret_dbus_property(self, value):
1604
 
        self.secret = str(value)
1605
 
    
1606
 
    del _interface
1607
 
 
1608
 
 
1609
 
class ProxyClient(object):
1610
 
    def __init__(self, child_pipe, fpr, address):
1611
 
        self._pipe = child_pipe
1612
 
        self._pipe.send(('init', fpr, address))
1613
 
        if not self._pipe.recv():
1614
 
            raise KeyError()
1615
 
    
1616
 
    def __getattribute__(self, name):
1617
 
        if name == '_pipe':
1618
 
            return super(ProxyClient, self).__getattribute__(name)
1619
 
        self._pipe.send(('getattr', name))
1620
 
        data = self._pipe.recv()
1621
 
        if data[0] == 'data':
1622
 
            return data[1]
1623
 
        if data[0] == 'function':
1624
 
            def func(*args, **kwargs):
1625
 
                self._pipe.send(('funcall', name, args, kwargs))
1626
 
                return self._pipe.recv()[1]
1627
 
            return func
1628
 
    
1629
 
    def __setattr__(self, name, value):
1630
 
        if name == '_pipe':
1631
 
            return super(ProxyClient, self).__setattr__(name, value)
1632
 
        self._pipe.send(('setattr', name, value))
1633
 
 
1634
 
 
1635
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1636
 
    """A class to handle client connections.
1637
 
    
1638
 
    Instantiated once for each connection to handle it.
 
248
    def still_valid(self, now=None):
 
249
        """Has the timeout not yet passed for this client?"""
 
250
        if now is None:
 
251
            now = datetime.datetime.now()
 
252
        if self.last_seen is None:
 
253
            return now < (self.created + self.timeout)
 
254
        else:
 
255
            return now < (self.last_seen + self.timeout)
 
256
 
 
257
 
 
258
def peer_certificate(session):
 
259
    # If not an OpenPGP certificate...
 
260
    if gnutls.library.functions.gnutls_certificate_type_get\
 
261
            (session._c_object) \
 
262
           != gnutls.library.constants.GNUTLS_CRT_OPENPGP:
 
263
        # ...do the normal thing
 
264
        return session.peer_certificate
 
265
    list_size = ctypes.c_uint()
 
266
    cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
 
267
        (session._c_object, ctypes.byref(list_size))
 
268
    if list_size.value == 0:
 
269
        return None
 
270
    cert = cert_list[0]
 
271
    return ctypes.string_at(cert.data, cert.size)
 
272
 
 
273
 
 
274
def fingerprint(openpgp):
 
275
    # New empty GnuTLS certificate
 
276
    crt = gnutls.library.types.gnutls_openpgp_crt_t()
 
277
    gnutls.library.functions.gnutls_openpgp_crt_init\
 
278
        (ctypes.byref(crt))
 
279
    # New GnuTLS "datum" with the OpenPGP public key
 
280
    datum = gnutls.library.types.gnutls_datum_t\
 
281
        (ctypes.cast(ctypes.c_char_p(openpgp),
 
282
                     ctypes.POINTER(ctypes.c_ubyte)),
 
283
         ctypes.c_uint(len(openpgp)))
 
284
    # Import the OpenPGP public key into the certificate
 
285
    ret = gnutls.library.functions.gnutls_openpgp_crt_import\
 
286
        (crt,
 
287
         ctypes.byref(datum),
 
288
         gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
 
289
    # New buffer for the fingerprint
 
290
    buffer = ctypes.create_string_buffer(20)
 
291
    buffer_length = ctypes.c_size_t()
 
292
    # Get the fingerprint from the certificate into the buffer
 
293
    gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
 
294
        (crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
 
295
    # Deinit the certificate
 
296
    gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
 
297
    # Convert the buffer to a Python bytestring
 
298
    fpr = ctypes.string_at(buffer, buffer_length.value)
 
299
    # Convert the bytestring to hexadecimal notation
 
300
    hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
 
301
    return hex_fpr
 
302
 
 
303
 
 
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
 
305
    """A TCP request handler class.
 
306
    Instantiated by IPv6_TCPServer for each request to handle it.
1639
307
    Note: This will run in its own forked process."""
1640
308
    
1641
309
    def handle(self):
1642
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1643
 
            logger.info("TCP connection from: %s",
1644
 
                        unicode(self.client_address))
1645
 
            logger.debug("Pipe FD: %d",
1646
 
                         self.server.child_pipe.fileno())
1647
 
            
1648
 
            session = (gnutls.connection
1649
 
                       .ClientSession(self.request,
1650
 
                                      gnutls.connection
1651
 
                                      .X509Credentials()))
1652
 
            
1653
 
            # Note: gnutls.connection.X509Credentials is really a
1654
 
            # generic GnuTLS certificate credentials object so long as
1655
 
            # no X.509 keys are added to it.  Therefore, we can use it
1656
 
            # here despite using OpenPGP certificates.
1657
 
            
1658
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1659
 
            #                      "+AES-256-CBC", "+SHA1",
1660
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1661
 
            #                      "+DHE-DSS"))
1662
 
            # Use a fallback default, since this MUST be set.
1663
 
            priority = self.server.gnutls_priority
1664
 
            if priority is None:
1665
 
                priority = "NORMAL"
1666
 
            (gnutls.library.functions
1667
 
             .gnutls_priority_set_direct(session._c_object,
1668
 
                                         priority, None))
1669
 
            
1670
 
            # Start communication using the Mandos protocol
1671
 
            # Get protocol number
1672
 
            line = self.request.makefile().readline()
1673
 
            logger.debug("Protocol version: %r", line)
1674
 
            try:
1675
 
                if int(line.strip().split()[0]) > 1:
1676
 
                    raise RuntimeError
1677
 
            except (ValueError, IndexError, RuntimeError) as error:
1678
 
                logger.error("Unknown protocol version: %s", error)
1679
 
                return
1680
 
            
1681
 
            # Start GnuTLS connection
1682
 
            try:
1683
 
                session.handshake()
1684
 
            except gnutls.errors.GNUTLSError as error:
1685
 
                logger.warning("Handshake failed: %s", error)
1686
 
                # Do not run session.bye() here: the session is not
1687
 
                # established.  Just abandon the request.
1688
 
                return
1689
 
            logger.debug("Handshake succeeded")
1690
 
            
1691
 
            approval_required = False
1692
 
            try:
1693
 
                try:
1694
 
                    fpr = self.fingerprint(self.peer_certificate
1695
 
                                           (session))
1696
 
                except (TypeError,
1697
 
                        gnutls.errors.GNUTLSError) as error:
1698
 
                    logger.warning("Bad certificate: %s", error)
1699
 
                    return
1700
 
                logger.debug("Fingerprint: %s", fpr)
1701
 
                
1702
 
                try:
1703
 
                    client = ProxyClient(child_pipe, fpr,
1704
 
                                         self.client_address)
1705
 
                except KeyError:
1706
 
                    return
1707
 
                
1708
 
                if client.approval_delay:
1709
 
                    delay = client.approval_delay
1710
 
                    client.approvals_pending += 1
1711
 
                    approval_required = True
1712
 
                
1713
 
                while True:
1714
 
                    if not client.enabled:
1715
 
                        logger.info("Client %s is disabled",
1716
 
                                       client.name)
1717
 
                        if self.server.use_dbus:
1718
 
                            # Emit D-Bus signal
1719
 
                            client.Rejected("Disabled")
1720
 
                        return
1721
 
                    
1722
 
                    if client.approved or not client.approval_delay:
1723
 
                        #We are approved or approval is disabled
1724
 
                        break
1725
 
                    elif client.approved is None:
1726
 
                        logger.info("Client %s needs approval",
1727
 
                                    client.name)
1728
 
                        if self.server.use_dbus:
1729
 
                            # Emit D-Bus signal
1730
 
                            client.NeedApproval(
1731
 
                                client.approval_delay_milliseconds(),
1732
 
                                client.approved_by_default)
1733
 
                    else:
1734
 
                        logger.warning("Client %s was not approved",
1735
 
                                       client.name)
1736
 
                        if self.server.use_dbus:
1737
 
                            # Emit D-Bus signal
1738
 
                            client.Rejected("Denied")
1739
 
                        return
1740
 
                    
1741
 
                    #wait until timeout or approved
1742
 
                    time = datetime.datetime.now()
1743
 
                    client.changedstate.acquire()
1744
 
                    client.changedstate.wait(
1745
 
                        float(timedelta_to_milliseconds(delay)
1746
 
                              / 1000))
1747
 
                    client.changedstate.release()
1748
 
                    time2 = datetime.datetime.now()
1749
 
                    if (time2 - time) >= delay:
1750
 
                        if not client.approved_by_default:
1751
 
                            logger.warning("Client %s timed out while"
1752
 
                                           " waiting for approval",
1753
 
                                           client.name)
1754
 
                            if self.server.use_dbus:
1755
 
                                # Emit D-Bus signal
1756
 
                                client.Rejected("Approval timed out")
1757
 
                            return
1758
 
                        else:
1759
 
                            break
1760
 
                    else:
1761
 
                        delay -= time2 - time
1762
 
                
1763
 
                sent_size = 0
1764
 
                while sent_size < len(client.secret):
1765
 
                    try:
1766
 
                        sent = session.send(client.secret[sent_size:])
1767
 
                    except gnutls.errors.GNUTLSError as error:
1768
 
                        logger.warning("gnutls send failed",
1769
 
                                       exc_info=error)
1770
 
                        return
1771
 
                    logger.debug("Sent: %d, remaining: %d",
1772
 
                                 sent, len(client.secret)
1773
 
                                 - (sent_size + sent))
1774
 
                    sent_size += sent
1775
 
                
1776
 
                logger.info("Sending secret to %s", client.name)
1777
 
                # bump the timeout using extended_timeout
1778
 
                client.bump_timeout(client.extended_timeout)
1779
 
                if self.server.use_dbus:
1780
 
                    # Emit D-Bus signal
1781
 
                    client.GotSecret()
1782
 
            
1783
 
            finally:
1784
 
                if approval_required:
1785
 
                    client.approvals_pending -= 1
1786
 
                try:
1787
 
                    session.bye()
1788
 
                except gnutls.errors.GNUTLSError as error:
1789
 
                    logger.warning("GnuTLS bye failed",
1790
 
                                   exc_info=error)
1791
 
    
1792
 
    @staticmethod
1793
 
    def peer_certificate(session):
1794
 
        "Return the peer's OpenPGP certificate as a bytestring"
1795
 
        # If not an OpenPGP certificate...
1796
 
        if (gnutls.library.functions
1797
 
            .gnutls_certificate_type_get(session._c_object)
1798
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1799
 
            # ...do the normal thing
1800
 
            return session.peer_certificate
1801
 
        list_size = ctypes.c_uint(1)
1802
 
        cert_list = (gnutls.library.functions
1803
 
                     .gnutls_certificate_get_peers
1804
 
                     (session._c_object, ctypes.byref(list_size)))
1805
 
        if not bool(cert_list) and list_size.value != 0:
1806
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1807
 
                                            " certificate")
1808
 
        if list_size.value == 0:
1809
 
            return None
1810
 
        cert = cert_list[0]
1811
 
        return ctypes.string_at(cert.data, cert.size)
1812
 
    
1813
 
    @staticmethod
1814
 
    def fingerprint(openpgp):
1815
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1816
 
        # New GnuTLS "datum" with the OpenPGP public key
1817
 
        datum = (gnutls.library.types
1818
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1819
 
                                             ctypes.POINTER
1820
 
                                             (ctypes.c_ubyte)),
1821
 
                                 ctypes.c_uint(len(openpgp))))
1822
 
        # New empty GnuTLS certificate
1823
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1824
 
        (gnutls.library.functions
1825
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1826
 
        # Import the OpenPGP public key into the certificate
1827
 
        (gnutls.library.functions
1828
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1829
 
                                    gnutls.library.constants
1830
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1831
 
        # Verify the self signature in the key
1832
 
        crtverify = ctypes.c_uint()
1833
 
        (gnutls.library.functions
1834
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1835
 
                                         ctypes.byref(crtverify)))
1836
 
        if crtverify.value != 0:
1837
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1838
 
            raise (gnutls.errors.CertificateSecurityError
1839
 
                   ("Verify failed"))
1840
 
        # New buffer for the fingerprint
1841
 
        buf = ctypes.create_string_buffer(20)
1842
 
        buf_len = ctypes.c_size_t()
1843
 
        # Get the fingerprint from the certificate into the buffer
1844
 
        (gnutls.library.functions
1845
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1846
 
                                             ctypes.byref(buf_len)))
1847
 
        # Deinit the certificate
1848
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1849
 
        # Convert the buffer to a Python bytestring
1850
 
        fpr = ctypes.string_at(buf, buf_len.value)
1851
 
        # Convert the bytestring to hexadecimal notation
1852
 
        hex_fpr = binascii.hexlify(fpr).upper()
1853
 
        return hex_fpr
1854
 
 
1855
 
 
1856
 
class MultiprocessingMixIn(object):
1857
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1858
 
    def sub_process_main(self, request, address):
1859
 
        try:
1860
 
            self.finish_request(request, address)
1861
 
        except Exception:
1862
 
            self.handle_error(request, address)
1863
 
        self.close_request(request)
1864
 
    
1865
 
    def process_request(self, request, address):
1866
 
        """Start a new process to process the request."""
1867
 
        proc = multiprocessing.Process(target = self.sub_process_main,
1868
 
                                       args = (request, address))
1869
 
        proc.start()
1870
 
        return proc
1871
 
 
1872
 
 
1873
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1874
 
    """ adds a pipe to the MixIn """
1875
 
    def process_request(self, request, client_address):
1876
 
        """Overrides and wraps the original process_request().
1877
 
        
1878
 
        This function creates a new pipe in self.pipe
1879
 
        """
1880
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1881
 
        
1882
 
        proc = MultiprocessingMixIn.process_request(self, request,
1883
 
                                                    client_address)
1884
 
        self.child_pipe.close()
1885
 
        self.add_pipe(parent_pipe, proc)
1886
 
    
1887
 
    def add_pipe(self, parent_pipe, proc):
1888
 
        """Dummy function; override as necessary"""
1889
 
        raise NotImplementedError
1890
 
 
1891
 
 
1892
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1893
 
                     socketserver.TCPServer, object):
1894
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1895
 
    
 
310
        logger.debug(u"TCP connection from: %s",
 
311
                     unicode(self.client_address))
 
312
        session = gnutls.connection.ClientSession(self.request,
 
313
                                                  gnutls.connection.\
 
314
                                                  X509Credentials())
 
315
        
 
316
        #priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
 
317
        #                "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
 
318
        #                "+DHE-DSS"))
 
319
        priority = "SECURE256"
 
320
        
 
321
        gnutls.library.functions.gnutls_priority_set_direct\
 
322
            (session._c_object, priority, None);
 
323
        
 
324
        try:
 
325
            session.handshake()
 
326
        except gnutls.errors.GNUTLSError, error:
 
327
            logger.debug(u"Handshake failed: %s", error)
 
328
            # Do not run session.bye() here: the session is not
 
329
            # established.  Just abandon the request.
 
330
            return
 
331
        try:
 
332
            fpr = fingerprint(peer_certificate(session))
 
333
        except (TypeError, gnutls.errors.GNUTLSError), error:
 
334
            logger.debug(u"Bad certificate: %s", error)
 
335
            session.bye()
 
336
            return
 
337
        logger.debug(u"Fingerprint: %s", fpr)
 
338
        client = None
 
339
        for c in clients:
 
340
            if c.fingerprint == fpr:
 
341
                client = c
 
342
                break
 
343
        # Have to check if client.still_valid(), since it is possible
 
344
        # that the client timed out while establishing the GnuTLS
 
345
        # session.
 
346
        if (not client) or (not client.still_valid()):
 
347
            if client:
 
348
                logger.debug(u"Client %(name)s is invalid",
 
349
                             vars(client))
 
350
            else:
 
351
                logger.debug(u"Client not found for fingerprint: %s",
 
352
                             fpr)
 
353
            session.bye()
 
354
            return
 
355
        sent_size = 0
 
356
        while sent_size < len(client.secret):
 
357
            sent = session.send(client.secret[sent_size:])
 
358
            logger.debug(u"Sent: %d, remaining: %d",
 
359
                         sent, len(client.secret)
 
360
                         - (sent_size + sent))
 
361
            sent_size += sent
 
362
        session.bye()
 
363
 
 
364
 
 
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
 
366
    """IPv6 TCP server.  Accepts 'None' as address and/or port.
1896
367
    Attributes:
1897
 
        enabled:        Boolean; whether this server is activated yet
1898
 
        interface:      None or a network interface name (string)
1899
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1900
370
    """
1901
 
    def __init__(self, server_address, RequestHandlerClass,
1902
 
                 interface=None, use_ipv6=True, socketfd=None):
1903
 
        """If socketfd is set, use that file descriptor instead of
1904
 
        creating a new one with socket.socket().
1905
 
        """
1906
 
        self.interface = interface
1907
 
        if use_ipv6:
1908
 
            self.address_family = socket.AF_INET6
1909
 
        if socketfd is not None:
1910
 
            # Save the file descriptor
1911
 
            self.socketfd = socketfd
1912
 
            # Save the original socket.socket() function
1913
 
            self.socket_socket = socket.socket
1914
 
            # To implement --socket, we monkey patch socket.socket.
1915
 
            # 
1916
 
            # (When socketserver.TCPServer is a new-style class, we
1917
 
            # could make self.socket into a property instead of monkey
1918
 
            # patching socket.socket.)
1919
 
            # 
1920
 
            # Create a one-time-only replacement for socket.socket()
1921
 
            @functools.wraps(socket.socket)
1922
 
            def socket_wrapper(*args, **kwargs):
1923
 
                # Restore original function so subsequent calls are
1924
 
                # not affected.
1925
 
                socket.socket = self.socket_socket
1926
 
                del self.socket_socket
1927
 
                # This time only, return a new socket object from the
1928
 
                # saved file descriptor.
1929
 
                return socket.fromfd(self.socketfd, *args, **kwargs)
1930
 
            # Replace socket.socket() function with wrapper
1931
 
            socket.socket = socket_wrapper
1932
 
        # The socketserver.TCPServer.__init__ will call
1933
 
        # socket.socket(), which might be our replacement,
1934
 
        # socket_wrapper(), if socketfd was set.
1935
 
        socketserver.TCPServer.__init__(self, server_address,
1936
 
                                        RequestHandlerClass)
1937
 
    
 
371
    address_family = socket.AF_INET6
 
372
    def __init__(self, *args, **kwargs):
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
 
376
        if "clients" in kwargs:
 
377
            self.clients = kwargs["clients"]
 
378
            del kwargs["clients"]
 
379
        return super(type(self), self).__init__(*args, **kwargs)
1938
380
    def server_bind(self):
1939
381
        """This overrides the normal server_bind() function
1940
382
        to bind to an interface if one was specified, and also NOT to
1941
383
        bind to an address or port if they were not specified."""
1942
 
        if self.interface is not None:
1943
 
            if SO_BINDTODEVICE is None:
1944
 
                logger.error("SO_BINDTODEVICE does not exist;"
1945
 
                             " cannot bind to interface %s",
1946
 
                             self.interface)
1947
 
            else:
1948
 
                try:
1949
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1950
 
                                           SO_BINDTODEVICE,
1951
 
                                           str(self.interface
1952
 
                                               + '\0'))
1953
 
                except socket.error as error:
1954
 
                    if error.errno == errno.EPERM:
1955
 
                        logger.error("No permission to"
1956
 
                                     " bind to interface %s",
1957
 
                                     self.interface)
1958
 
                    elif error.errno == errno.ENOPROTOOPT:
1959
 
                        logger.error("SO_BINDTODEVICE not available;"
1960
 
                                     " cannot bind to interface %s",
1961
 
                                     self.interface)
1962
 
                    elif error.errno == errno.ENODEV:
1963
 
                        logger.error("Interface %s does not"
1964
 
                                     " exist, cannot bind",
1965
 
                                     self.interface)
1966
 
                    else:
1967
 
                        raise
 
384
        if self.options.interface:
 
385
            if not hasattr(socket, "SO_BINDTODEVICE"):
 
386
                # From /usr/include/asm-i486/socket.h
 
387
                socket.SO_BINDTODEVICE = 25
 
388
            try:
 
389
                self.socket.setsockopt(socket.SOL_SOCKET,
 
390
                                       socket.SO_BINDTODEVICE,
 
391
                                       self.options.interface)
 
392
            except socket.error, error:
 
393
                if error[0] == errno.EPERM:
 
394
                    logger.warning(u"No permission to"
 
395
                                   u" bind to interface %s",
 
396
                                   self.options.interface)
 
397
                else:
 
398
                    raise error
1968
399
        # Only bind(2) the socket if we really need to.
1969
400
        if self.server_address[0] or self.server_address[1]:
1970
401
            if not self.server_address[0]:
1971
 
                if self.address_family == socket.AF_INET6:
1972
 
                    any_address = "::" # in6addr_any
1973
 
                else:
1974
 
                    any_address = socket.INADDR_ANY
1975
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1976
404
                                       self.server_address[1])
1977
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1978
406
                self.server_address = (self.server_address[0],
1979
407
                                       0)
1980
 
#                 if self.interface:
1981
 
#                     self.server_address = (self.server_address[0],
1982
 
#                                            0, # port
1983
 
#                                            0, # flowinfo
1984
 
#                                            if_nametoindex
1985
 
#                                            (self.interface))
1986
 
            return socketserver.TCPServer.server_bind(self)
1987
 
 
1988
 
 
1989
 
class MandosServer(IPv6_TCPServer):
1990
 
    """Mandos server.
1991
 
    
1992
 
    Attributes:
1993
 
        clients:        set of Client objects
1994
 
        gnutls_priority GnuTLS priority string
1995
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1996
 
    
1997
 
    Assumes a gobject.MainLoop event loop.
1998
 
    """
1999
 
    def __init__(self, server_address, RequestHandlerClass,
2000
 
                 interface=None, use_ipv6=True, clients=None,
2001
 
                 gnutls_priority=None, use_dbus=True, socketfd=None):
2002
 
        self.enabled = False
2003
 
        self.clients = clients
2004
 
        if self.clients is None:
2005
 
            self.clients = {}
2006
 
        self.use_dbus = use_dbus
2007
 
        self.gnutls_priority = gnutls_priority
2008
 
        IPv6_TCPServer.__init__(self, server_address,
2009
 
                                RequestHandlerClass,
2010
 
                                interface = interface,
2011
 
                                use_ipv6 = use_ipv6,
2012
 
                                socketfd = socketfd)
2013
 
    def server_activate(self):
2014
 
        if self.enabled:
2015
 
            return socketserver.TCPServer.server_activate(self)
2016
 
    
2017
 
    def enable(self):
2018
 
        self.enabled = True
2019
 
    
2020
 
    def add_pipe(self, parent_pipe, proc):
2021
 
        # Call "handle_ipc" for both data and EOF events
2022
 
        gobject.io_add_watch(parent_pipe.fileno(),
2023
 
                             gobject.IO_IN | gobject.IO_HUP,
2024
 
                             functools.partial(self.handle_ipc,
2025
 
                                               parent_pipe =
2026
 
                                               parent_pipe,
2027
 
                                               proc = proc))
2028
 
    
2029
 
    def handle_ipc(self, source, condition, parent_pipe=None,
2030
 
                   proc = None, client_object=None):
2031
 
        # error, or the other end of multiprocessing.Pipe has closed
2032
 
        if condition & (gobject.IO_ERR | gobject.IO_HUP):
2033
 
            # Wait for other process to exit
2034
 
            proc.join()
2035
 
            return False
2036
 
        
2037
 
        # Read a request from the child
2038
 
        request = parent_pipe.recv()
2039
 
        command = request[0]
2040
 
        
2041
 
        if command == 'init':
2042
 
            fpr = request[1]
2043
 
            address = request[2]
2044
 
            
2045
 
            for c in self.clients.itervalues():
2046
 
                if c.fingerprint == fpr:
2047
 
                    client = c
2048
 
                    break
2049
 
            else:
2050
 
                logger.info("Client not found for fingerprint: %s, ad"
2051
 
                            "dress: %s", fpr, address)
2052
 
                if self.use_dbus:
2053
 
                    # Emit D-Bus signal
2054
 
                    mandos_dbus_service.ClientNotFound(fpr,
2055
 
                                                       address[0])
2056
 
                parent_pipe.send(False)
2057
 
                return False
2058
 
            
2059
 
            gobject.io_add_watch(parent_pipe.fileno(),
2060
 
                                 gobject.IO_IN | gobject.IO_HUP,
2061
 
                                 functools.partial(self.handle_ipc,
2062
 
                                                   parent_pipe =
2063
 
                                                   parent_pipe,
2064
 
                                                   proc = proc,
2065
 
                                                   client_object =
2066
 
                                                   client))
2067
 
            parent_pipe.send(True)
2068
 
            # remove the old hook in favor of the new above hook on
2069
 
            # same fileno
2070
 
            return False
2071
 
        if command == 'funcall':
2072
 
            funcname = request[1]
2073
 
            args = request[2]
2074
 
            kwargs = request[3]
2075
 
            
2076
 
            parent_pipe.send(('data', getattr(client_object,
2077
 
                                              funcname)(*args,
2078
 
                                                         **kwargs)))
2079
 
        
2080
 
        if command == 'getattr':
2081
 
            attrname = request[1]
2082
 
            if callable(client_object.__getattribute__(attrname)):
2083
 
                parent_pipe.send(('function',))
2084
 
            else:
2085
 
                parent_pipe.send(('data', client_object
2086
 
                                  .__getattribute__(attrname)))
2087
 
        
2088
 
        if command == 'setattr':
2089
 
            attrname = request[1]
2090
 
            value = request[2]
2091
 
            setattr(client_object, attrname, value)
2092
 
        
2093
 
        return True
 
408
            return super(type(self), self).server_bind()
2094
409
 
2095
410
 
2096
411
def string_to_delta(interval):
2097
412
    """Parse a string and return a datetime.timedelta
2098
 
    
 
413
 
2099
414
    >>> string_to_delta('7d')
2100
415
    datetime.timedelta(7)
2101
416
    >>> string_to_delta('60s')
2104
419
    datetime.timedelta(0, 3600)
2105
420
    >>> string_to_delta('24h')
2106
421
    datetime.timedelta(1)
2107
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
2108
423
    datetime.timedelta(7)
2109
 
    >>> string_to_delta('5m 30s')
2110
 
    datetime.timedelta(0, 330)
2111
424
    """
2112
 
    timevalue = datetime.timedelta(0)
2113
 
    for s in interval.split():
2114
 
        try:
2115
 
            suffix = unicode(s[-1])
2116
 
            value = int(s[:-1])
2117
 
            if suffix == "d":
2118
 
                delta = datetime.timedelta(value)
2119
 
            elif suffix == "s":
2120
 
                delta = datetime.timedelta(0, value)
2121
 
            elif suffix == "m":
2122
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
2123
 
            elif suffix == "h":
2124
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
2125
 
            elif suffix == "w":
2126
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2127
 
            else:
2128
 
                raise ValueError("Unknown suffix {0!r}"
2129
 
                                 .format(suffix))
2130
 
        except (ValueError, IndexError) as e:
2131
 
            raise ValueError(*(e.args))
2132
 
        timevalue += delta
2133
 
    return timevalue
2134
 
 
2135
 
 
2136
 
def daemon(nochdir = False, noclose = False):
2137
 
    """See daemon(3).  Standard BSD Unix function.
2138
 
    
2139
 
    This should really exist as os.daemon, but it doesn't (yet)."""
2140
 
    if os.fork():
2141
 
        sys.exit()
2142
 
    os.setsid()
2143
 
    if not nochdir:
2144
 
        os.chdir("/")
2145
 
    if os.fork():
2146
 
        sys.exit()
2147
 
    if not noclose:
2148
 
        # Close all standard open file descriptors
2149
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2150
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
2151
 
            raise OSError(errno.ENODEV,
2152
 
                          "{0} not a character device"
2153
 
                          .format(os.devnull))
2154
 
        os.dup2(null, sys.stdin.fileno())
2155
 
        os.dup2(null, sys.stdout.fileno())
2156
 
        os.dup2(null, sys.stderr.fileno())
2157
 
        if null > 2:
2158
 
            os.close(null)
2159
 
 
2160
 
 
2161
 
def main():
2162
 
    
2163
 
    ##################################################################
2164
 
    # Parsing of options, both command line and config file
2165
 
    
2166
 
    parser = argparse.ArgumentParser()
2167
 
    parser.add_argument("-v", "--version", action="version",
2168
 
                        version = "%(prog)s {0}".format(version),
2169
 
                        help="show version number and exit")
2170
 
    parser.add_argument("-i", "--interface", metavar="IF",
2171
 
                        help="Bind to interface IF")
2172
 
    parser.add_argument("-a", "--address",
2173
 
                        help="Address to listen for requests on")
2174
 
    parser.add_argument("-p", "--port", type=int,
2175
 
                        help="Port number to receive requests on")
2176
 
    parser.add_argument("--check", action="store_true",
2177
 
                        help="Run self-test")
2178
 
    parser.add_argument("--debug", action="store_true",
2179
 
                        help="Debug mode; run in foreground and log"
2180
 
                        " to terminal")
2181
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2182
 
                        help="Debug level for stdout output")
2183
 
    parser.add_argument("--priority", help="GnuTLS"
2184
 
                        " priority string (see GnuTLS documentation)")
2185
 
    parser.add_argument("--servicename",
2186
 
                        metavar="NAME", help="Zeroconf service name")
2187
 
    parser.add_argument("--configdir",
2188
 
                        default="/etc/mandos", metavar="DIR",
2189
 
                        help="Directory to search for configuration"
2190
 
                        " files")
2191
 
    parser.add_argument("--no-dbus", action="store_false",
2192
 
                        dest="use_dbus", help="Do not provide D-Bus"
2193
 
                        " system bus interface")
2194
 
    parser.add_argument("--no-ipv6", action="store_false",
2195
 
                        dest="use_ipv6", help="Do not use IPv6")
2196
 
    parser.add_argument("--no-restore", action="store_false",
2197
 
                        dest="restore", help="Do not restore stored"
2198
 
                        " state")
2199
 
    parser.add_argument("--socket", type=int,
2200
 
                        help="Specify a file descriptor to a network"
2201
 
                        " socket to use instead of creating one")
2202
 
    parser.add_argument("--statedir", metavar="DIR",
2203
 
                        help="Directory to save/restore state in")
2204
 
    
2205
 
    options = parser.parse_args()
 
425
    try:
 
426
        suffix=unicode(interval[-1])
 
427
        value=int(interval[:-1])
 
428
        if suffix == u"d":
 
429
            delta = datetime.timedelta(value)
 
430
        elif suffix == u"s":
 
431
            delta = datetime.timedelta(0, value)
 
432
        elif suffix == u"m":
 
433
            delta = datetime.timedelta(0, 0, 0, 0, value)
 
434
        elif suffix == u"h":
 
435
            delta = datetime.timedelta(0, 0, 0, 0, 0, value)
 
436
        elif suffix == u"w":
 
437
            delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
 
438
        else:
 
439
            raise ValueError
 
440
    except (ValueError, IndexError):
 
441
        raise ValueError
 
442
    return delta
 
443
 
 
444
 
 
445
def add_service():
 
446
    """From the Avahi server example code"""
 
447
    global group, serviceName, serviceType, servicePort, serviceTXT, \
 
448
           domain, host
 
449
    if group is None:
 
450
        group = dbus.Interface(
 
451
                bus.get_object( avahi.DBUS_NAME,
 
452
                                server.EntryGroupNew()),
 
453
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
 
454
        group.connect_to_signal('StateChanged',
 
455
                                entry_group_state_changed)
 
456
    logger.debug(u"Adding service '%s' of type '%s' ...",
 
457
                 serviceName, serviceType)
 
458
    
 
459
    group.AddService(
 
460
            serviceInterface,           # interface
 
461
            avahi.PROTO_INET6,          # protocol
 
462
            dbus.UInt32(0),             # flags
 
463
            serviceName, serviceType,
 
464
            domain, host,
 
465
            dbus.UInt16(servicePort),
 
466
            avahi.string_array_to_txt_array(serviceTXT))
 
467
    group.Commit()
 
468
 
 
469
 
 
470
def remove_service():
 
471
    """From the Avahi server example code"""
 
472
    global group
 
473
    
 
474
    if not group is None:
 
475
        group.Reset()
 
476
 
 
477
 
 
478
def server_state_changed(state):
 
479
    """From the Avahi server example code"""
 
480
    if state == avahi.SERVER_COLLISION:
 
481
        logger.warning(u"Server name collision")
 
482
        remove_service()
 
483
    elif state == avahi.SERVER_RUNNING:
 
484
        add_service()
 
485
 
 
486
 
 
487
def entry_group_state_changed(state, error):
 
488
    """From the Avahi server example code"""
 
489
    global serviceName, server, rename_count
 
490
    
 
491
    logger.debug(u"state change: %i", state)
 
492
    
 
493
    if state == avahi.ENTRY_GROUP_ESTABLISHED:
 
494
        logger.debug(u"Service established.")
 
495
    elif state == avahi.ENTRY_GROUP_COLLISION:
 
496
        
 
497
        rename_count = rename_count - 1
 
498
        if rename_count > 0:
 
499
            name = server.GetAlternativeServiceName(name)
 
500
            logger.warning(u"Service name collision, "
 
501
                           u"changing name to '%s' ...", name)
 
502
            remove_service()
 
503
            add_service()
 
504
            
 
505
        else:
 
506
            logger.error(u"No suitable service name found "
 
507
                         u"after %i retries, exiting.",
 
508
                         n_rename)
 
509
            main_loop.quit()
 
510
    elif state == avahi.ENTRY_GROUP_FAILURE:
 
511
        logger.error(u"Error in group state changed %s",
 
512
                     unicode(error))
 
513
        main_loop.quit()
 
514
        return
 
515
 
 
516
 
 
517
def if_nametoindex(interface):
 
518
    """Call the C function if_nametoindex()"""
 
519
    try:
 
520
        libc = ctypes.cdll.LoadLibrary("libc.so.6")
 
521
        return libc.if_nametoindex(interface)
 
522
    except (OSError, AttributeError):
 
523
        if "struct" not in sys.modules:
 
524
            import struct
 
525
        if "fcntl" not in sys.modules:
 
526
            import fcntl
 
527
        SIOCGIFINDEX = 0x8933      # From /usr/include/linux/sockios.h
 
528
        s = socket.socket()
 
529
        ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
 
530
                            struct.pack("16s16x", interface))
 
531
        s.close()
 
532
        interface_index = struct.unpack("I", ifreq[16:20])[0]
 
533
        return interface_index
 
534
 
 
535
 
 
536
if __name__ == '__main__':
 
537
    parser = OptionParser()
 
538
    parser.add_option("-i", "--interface", type="string",
 
539
                      default=None, metavar="IF",
 
540
                      help="Bind to interface IF")
 
541
    parser.add_option("--cert", type="string", default="cert.pem",
 
542
                      metavar="FILE",
 
543
                      help="Public key certificate PEM file to use")
 
544
    parser.add_option("--key", type="string", default="key.pem",
 
545
                      metavar="FILE",
 
546
                      help="Private key PEM file to use")
 
547
    parser.add_option("--ca", type="string", default="ca.pem",
 
548
                      metavar="FILE",
 
549
                      help="Certificate Authority certificate PEM file to use")
 
550
    parser.add_option("--crl", type="string", default="crl.pem",
 
551
                      metavar="FILE",
 
552
                      help="Certificate Revokation List PEM file to use")
 
553
    parser.add_option("-p", "--port", type="int", default=None,
 
554
                      help="Port number to receive requests on")
 
555
    parser.add_option("--timeout", type="string", # Parsed later
 
556
                      default="1h",
 
557
                      help="Amount of downtime allowed for clients")
 
558
    parser.add_option("--interval", type="string", # Parsed later
 
559
                      default="5m",
 
560
                      help="How often to check that a client is up")
 
561
    parser.add_option("--check", action="store_true", default=False,
 
562
                      help="Run self-test")
 
563
    parser.add_option("--debug", action="store_true", default=False,
 
564
                      help="Debug mode")
 
565
    (options, args) = parser.parse_args()
2206
566
    
2207
567
    if options.check:
2208
568
        import doctest
2209
569
        doctest.testmod()
2210
570
        sys.exit()
2211
571
    
2212
 
    # Default values for config file for server-global settings
2213
 
    server_defaults = { "interface": "",
2214
 
                        "address": "",
2215
 
                        "port": "",
2216
 
                        "debug": "False",
2217
 
                        "priority":
2218
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
2219
 
                        "servicename": "Mandos",
2220
 
                        "use_dbus": "True",
2221
 
                        "use_ipv6": "True",
2222
 
                        "debuglevel": "",
2223
 
                        "restore": "True",
2224
 
                        "socket": "",
2225
 
                        "statedir": "/var/lib/mandos"
2226
 
                        }
2227
 
    
2228
 
    # Parse config file for server-global settings
2229
 
    server_config = configparser.SafeConfigParser(server_defaults)
2230
 
    del server_defaults
2231
 
    server_config.read(os.path.join(options.configdir,
2232
 
                                    "mandos.conf"))
2233
 
    # Convert the SafeConfigParser object to a dict
2234
 
    server_settings = server_config.defaults()
2235
 
    # Use the appropriate methods on the non-string config options
2236
 
    for option in ("debug", "use_dbus", "use_ipv6"):
2237
 
        server_settings[option] = server_config.getboolean("DEFAULT",
2238
 
                                                           option)
2239
 
    if server_settings["port"]:
2240
 
        server_settings["port"] = server_config.getint("DEFAULT",
2241
 
                                                       "port")
2242
 
    if server_settings["socket"]:
2243
 
        server_settings["socket"] = server_config.getint("DEFAULT",
2244
 
                                                         "socket")
2245
 
        # Later, stdin will, and stdout and stderr might, be dup'ed
2246
 
        # over with an opened os.devnull.  But we don't want this to
2247
 
        # happen with a supplied network socket.
2248
 
        if 0 <= server_settings["socket"] <= 2:
2249
 
            server_settings["socket"] = os.dup(server_settings
2250
 
                                               ["socket"])
2251
 
    del server_config
2252
 
    
2253
 
    # Override the settings from the config file with command line
2254
 
    # options, if set.
2255
 
    for option in ("interface", "address", "port", "debug",
2256
 
                   "priority", "servicename", "configdir",
2257
 
                   "use_dbus", "use_ipv6", "debuglevel", "restore",
2258
 
                   "statedir", "socket"):
2259
 
        value = getattr(options, option)
2260
 
        if value is not None:
2261
 
            server_settings[option] = value
2262
 
    del options
2263
 
    # Force all strings to be unicode
2264
 
    for option in server_settings.keys():
2265
 
        if type(server_settings[option]) is str:
2266
 
            server_settings[option] = unicode(server_settings[option])
2267
 
    # Now we have our good server settings in "server_settings"
2268
 
    
2269
 
    ##################################################################
2270
 
    
2271
 
    # For convenience
2272
 
    debug = server_settings["debug"]
2273
 
    debuglevel = server_settings["debuglevel"]
2274
 
    use_dbus = server_settings["use_dbus"]
2275
 
    use_ipv6 = server_settings["use_ipv6"]
2276
 
    stored_state_path = os.path.join(server_settings["statedir"],
2277
 
                                     stored_state_file)
2278
 
    
2279
 
    if debug:
2280
 
        initlogger(debug, logging.DEBUG)
2281
 
    else:
2282
 
        if not debuglevel:
2283
 
            initlogger(debug)
2284
 
        else:
2285
 
            level = getattr(logging, debuglevel.upper())
2286
 
            initlogger(debug, level)
2287
 
    
2288
 
    if server_settings["servicename"] != "Mandos":
2289
 
        syslogger.setFormatter(logging.Formatter
2290
 
                               ('Mandos ({0}) [%(process)d]:'
2291
 
                                ' %(levelname)s: %(message)s'
2292
 
                                .format(server_settings
2293
 
                                        ["servicename"])))
2294
 
    
2295
 
    # Parse config file with clients
2296
 
    client_config = configparser.SafeConfigParser(Client
2297
 
                                                  .client_defaults)
2298
 
    client_config.read(os.path.join(server_settings["configdir"],
2299
 
                                    "clients.conf"))
2300
 
    
2301
 
    global mandos_dbus_service
2302
 
    mandos_dbus_service = None
2303
 
    
2304
 
    tcp_server = MandosServer((server_settings["address"],
2305
 
                               server_settings["port"]),
2306
 
                              ClientHandler,
2307
 
                              interface=(server_settings["interface"]
2308
 
                                         or None),
2309
 
                              use_ipv6=use_ipv6,
2310
 
                              gnutls_priority=
2311
 
                              server_settings["priority"],
2312
 
                              use_dbus=use_dbus,
2313
 
                              socketfd=(server_settings["socket"]
2314
 
                                        or None))
2315
 
    if not debug:
2316
 
        pidfilename = "/var/run/mandos.pid"
2317
 
        try:
2318
 
            pidfile = open(pidfilename, "w")
2319
 
        except IOError as e:
2320
 
            logger.error("Could not open file %r", pidfilename,
2321
 
                         exc_info=e)
2322
 
    
2323
 
    for name in ("_mandos", "mandos", "nobody"):
2324
 
        try:
2325
 
            uid = pwd.getpwnam(name).pw_uid
2326
 
            gid = pwd.getpwnam(name).pw_gid
2327
 
            break
2328
 
        except KeyError:
2329
 
            continue
2330
 
    else:
2331
 
        uid = 65534
2332
 
        gid = 65534
2333
 
    try:
2334
 
        os.setgid(gid)
2335
 
        os.setuid(uid)
2336
 
    except OSError as error:
2337
 
        if error.errno != errno.EPERM:
2338
 
            raise error
2339
 
    
2340
 
    if debug:
2341
 
        # Enable all possible GnuTLS debugging
2342
 
        
2343
 
        # "Use a log level over 10 to enable all debugging options."
2344
 
        # - GnuTLS manual
2345
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
2346
 
        
2347
 
        @gnutls.library.types.gnutls_log_func
2348
 
        def debug_gnutls(level, string):
2349
 
            logger.debug("GnuTLS: %s", string[:-1])
2350
 
        
2351
 
        (gnutls.library.functions
2352
 
         .gnutls_global_set_log_function(debug_gnutls))
2353
 
        
2354
 
        # Redirect stdin so all checkers get /dev/null
2355
 
        null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2356
 
        os.dup2(null, sys.stdin.fileno())
2357
 
        if null > 2:
2358
 
            os.close(null)
2359
 
    
2360
 
    # Need to fork before connecting to D-Bus
2361
 
    if not debug:
2362
 
        # Close all input and output, do double fork, etc.
2363
 
        daemon()
2364
 
    
2365
 
    # multiprocessing will use threads, so before we use gobject we
2366
 
    # need to inform gobject that threads will be used.
2367
 
    gobject.threads_init()
2368
 
    
2369
 
    global main_loop
2370
 
    # From the Avahi example code
2371
 
    DBusGMainLoop(set_as_default=True)
 
572
    # Parse the time arguments
 
573
    try:
 
574
        options.timeout = string_to_delta(options.timeout)
 
575
    except ValueError:
 
576
        parser.error("option --timeout: Unparseable time")
 
577
    try:
 
578
        options.interval = string_to_delta(options.interval)
 
579
    except ValueError:
 
580
        parser.error("option --interval: Unparseable time")
 
581
    
 
582
    # Parse config file
 
583
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
584
    client_config = ConfigParser.SafeConfigParser(defaults)
 
585
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
586
    client_config.read("mandos-clients.conf")
 
587
    
 
588
    # From the Avahi server example code
 
589
    DBusGMainLoop(set_as_default=True )
2372
590
    main_loop = gobject.MainLoop()
2373
591
    bus = dbus.SystemBus()
2374
 
    # End of Avahi example code
2375
 
    if use_dbus:
2376
 
        try:
2377
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
2378
 
                                            bus, do_not_queue=True)
2379
 
            old_bus_name = (dbus.service.BusName
2380
 
                            ("se.bsnet.fukt.Mandos", bus,
2381
 
                             do_not_queue=True))
2382
 
        except dbus.exceptions.NameExistsException as e:
2383
 
            logger.error("Disabling D-Bus:", exc_info=e)
2384
 
            use_dbus = False
2385
 
            server_settings["use_dbus"] = False
2386
 
            tcp_server.use_dbus = False
2387
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2388
 
    service = AvahiServiceToSyslog(name =
2389
 
                                   server_settings["servicename"],
2390
 
                                   servicetype = "_mandos._tcp",
2391
 
                                   protocol = protocol, bus = bus)
2392
 
    if server_settings["interface"]:
2393
 
        service.interface = (if_nametoindex
2394
 
                             (str(server_settings["interface"])))
2395
 
    
2396
 
    global multiprocessing_manager
2397
 
    multiprocessing_manager = multiprocessing.Manager()
2398
 
    
2399
 
    client_class = Client
2400
 
    if use_dbus:
2401
 
        client_class = functools.partial(ClientDBus, bus = bus)
2402
 
    
2403
 
    client_settings = Client.config_parser(client_config)
2404
 
    old_client_settings = {}
2405
 
    clients_data = {}
2406
 
    
2407
 
    # Get client data and settings from last running state.
2408
 
    if server_settings["restore"]:
2409
 
        try:
2410
 
            with open(stored_state_path, "rb") as stored_state:
2411
 
                clients_data, old_client_settings = (pickle.load
2412
 
                                                     (stored_state))
2413
 
            os.remove(stored_state_path)
2414
 
        except IOError as e:
2415
 
            if e.errno == errno.ENOENT:
2416
 
                logger.warning("Could not load persistent state: {0}"
2417
 
                                .format(os.strerror(e.errno)))
2418
 
            else:
2419
 
                logger.critical("Could not load persistent state:",
2420
 
                                exc_info=e)
2421
 
                raise
2422
 
        except EOFError as e:
2423
 
            logger.warning("Could not load persistent state: "
2424
 
                           "EOFError:", exc_info=e)
2425
 
    
2426
 
    with PGPEngine() as pgp:
2427
 
        for client_name, client in clients_data.iteritems():
2428
 
            # Decide which value to use after restoring saved state.
2429
 
            # We have three different values: Old config file,
2430
 
            # new config file, and saved state.
2431
 
            # New config value takes precedence if it differs from old
2432
 
            # config value, otherwise use saved state.
2433
 
            for name, value in client_settings[client_name].items():
2434
 
                try:
2435
 
                    # For each value in new config, check if it
2436
 
                    # differs from the old config value (Except for
2437
 
                    # the "secret" attribute)
2438
 
                    if (name != "secret" and
2439
 
                        value != old_client_settings[client_name]
2440
 
                        [name]):
2441
 
                        client[name] = value
2442
 
                except KeyError:
2443
 
                    pass
2444
 
            
2445
 
            # Clients who has passed its expire date can still be
2446
 
            # enabled if its last checker was successful.  Clients
2447
 
            # whose checker succeeded before we stored its state is
2448
 
            # assumed to have successfully run all checkers during
2449
 
            # downtime.
2450
 
            if client["enabled"]:
2451
 
                if datetime.datetime.utcnow() >= client["expires"]:
2452
 
                    if not client["last_checked_ok"]:
2453
 
                        logger.warning(
2454
 
                            "disabling client {0} - Client never "
2455
 
                            "performed a successful checker"
2456
 
                            .format(client_name))
2457
 
                        client["enabled"] = False
2458
 
                    elif client["last_checker_status"] != 0:
2459
 
                        logger.warning(
2460
 
                            "disabling client {0} - Client "
2461
 
                            "last checker failed with error code {1}"
2462
 
                            .format(client_name,
2463
 
                                    client["last_checker_status"]))
2464
 
                        client["enabled"] = False
2465
 
                    else:
2466
 
                        client["expires"] = (datetime.datetime
2467
 
                                             .utcnow()
2468
 
                                             + client["timeout"])
2469
 
                        logger.debug("Last checker succeeded,"
2470
 
                                     " keeping {0} enabled"
2471
 
                                     .format(client_name))
2472
 
            try:
2473
 
                client["secret"] = (
2474
 
                    pgp.decrypt(client["encrypted_secret"],
2475
 
                                client_settings[client_name]
2476
 
                                ["secret"]))
2477
 
            except PGPError:
2478
 
                # If decryption fails, we use secret from new settings
2479
 
                logger.debug("Failed to decrypt {0} old secret"
2480
 
                             .format(client_name))
2481
 
                client["secret"] = (
2482
 
                    client_settings[client_name]["secret"])
2483
 
    
2484
 
    # Add/remove clients based on new changes made to config
2485
 
    for client_name in (set(old_client_settings)
2486
 
                        - set(client_settings)):
2487
 
        del clients_data[client_name]
2488
 
    for client_name in (set(client_settings)
2489
 
                        - set(old_client_settings)):
2490
 
        clients_data[client_name] = client_settings[client_name]
2491
 
    
2492
 
    # Create all client objects
2493
 
    for client_name, client in clients_data.iteritems():
2494
 
        tcp_server.clients[client_name] = client_class(
2495
 
            name = client_name, settings = client)
2496
 
    
2497
 
    if not tcp_server.clients:
2498
 
        logger.warning("No clients defined")
2499
 
    
2500
 
    if not debug:
2501
 
        try:
2502
 
            with pidfile:
2503
 
                pid = os.getpid()
2504
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2505
 
            del pidfile
2506
 
        except IOError:
2507
 
            logger.error("Could not write to file %r with PID %d",
2508
 
                         pidfilename, pid)
2509
 
        except NameError:
2510
 
            # "pidfile" was never created
2511
 
            pass
2512
 
        del pidfilename
2513
 
    
2514
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2515
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2516
 
    
2517
 
    if use_dbus:
2518
 
        @alternate_dbus_interfaces({"se.recompile.Mandos":
2519
 
                                        "se.bsnet.fukt.Mandos"})
2520
 
        class MandosDBusService(DBusObjectWithProperties):
2521
 
            """A D-Bus proxy object"""
2522
 
            def __init__(self):
2523
 
                dbus.service.Object.__init__(self, bus, "/")
2524
 
            _interface = "se.recompile.Mandos"
2525
 
            
2526
 
            @dbus_interface_annotations(_interface)
2527
 
            def _foo(self):
2528
 
                return { "org.freedesktop.DBus.Property"
2529
 
                         ".EmitsChangedSignal":
2530
 
                             "false"}
2531
 
            
2532
 
            @dbus.service.signal(_interface, signature="o")
2533
 
            def ClientAdded(self, objpath):
2534
 
                "D-Bus signal"
2535
 
                pass
2536
 
            
2537
 
            @dbus.service.signal(_interface, signature="ss")
2538
 
            def ClientNotFound(self, fingerprint, address):
2539
 
                "D-Bus signal"
2540
 
                pass
2541
 
            
2542
 
            @dbus.service.signal(_interface, signature="os")
2543
 
            def ClientRemoved(self, objpath, name):
2544
 
                "D-Bus signal"
2545
 
                pass
2546
 
            
2547
 
            @dbus.service.method(_interface, out_signature="ao")
2548
 
            def GetAllClients(self):
2549
 
                "D-Bus method"
2550
 
                return dbus.Array(c.dbus_object_path
2551
 
                                  for c in
2552
 
                                  tcp_server.clients.itervalues())
2553
 
            
2554
 
            @dbus.service.method(_interface,
2555
 
                                 out_signature="a{oa{sv}}")
2556
 
            def GetAllClientsWithProperties(self):
2557
 
                "D-Bus method"
2558
 
                return dbus.Dictionary(
2559
 
                    ((c.dbus_object_path, c.GetAll(""))
2560
 
                     for c in tcp_server.clients.itervalues()),
2561
 
                    signature="oa{sv}")
2562
 
            
2563
 
            @dbus.service.method(_interface, in_signature="o")
2564
 
            def RemoveClient(self, object_path):
2565
 
                "D-Bus method"
2566
 
                for c in tcp_server.clients.itervalues():
2567
 
                    if c.dbus_object_path == object_path:
2568
 
                        del tcp_server.clients[c.name]
2569
 
                        c.remove_from_connection()
2570
 
                        # Don't signal anything except ClientRemoved
2571
 
                        c.disable(quiet=True)
2572
 
                        # Emit D-Bus signal
2573
 
                        self.ClientRemoved(object_path, c.name)
2574
 
                        return
2575
 
                raise KeyError(object_path)
2576
 
            
2577
 
            del _interface
2578
 
        
2579
 
        mandos_dbus_service = MandosDBusService()
2580
 
    
2581
 
    def cleanup():
2582
 
        "Cleanup function; run on exit"
2583
 
        service.cleanup()
2584
 
        
2585
 
        multiprocessing.active_children()
2586
 
        if not (tcp_server.clients or client_settings):
2587
 
            return
2588
 
        
2589
 
        # Store client before exiting. Secrets are encrypted with key
2590
 
        # based on what config file has. If config file is
2591
 
        # removed/edited, old secret will thus be unrecovable.
2592
 
        clients = {}
2593
 
        with PGPEngine() as pgp:
2594
 
            for client in tcp_server.clients.itervalues():
2595
 
                key = client_settings[client.name]["secret"]
2596
 
                client.encrypted_secret = pgp.encrypt(client.secret,
2597
 
                                                      key)
2598
 
                client_dict = {}
2599
 
                
2600
 
                # A list of attributes that can not be pickled
2601
 
                # + secret.
2602
 
                exclude = set(("bus", "changedstate", "secret",
2603
 
                               "checker"))
2604
 
                for name, typ in (inspect.getmembers
2605
 
                                  (dbus.service.Object)):
2606
 
                    exclude.add(name)
2607
 
                
2608
 
                client_dict["encrypted_secret"] = (client
2609
 
                                                   .encrypted_secret)
2610
 
                for attr in client.client_structure:
2611
 
                    if attr not in exclude:
2612
 
                        client_dict[attr] = getattr(client, attr)
2613
 
                
2614
 
                clients[client.name] = client_dict
2615
 
                del client_settings[client.name]["secret"]
2616
 
        
2617
 
        try:
2618
 
            with (tempfile.NamedTemporaryFile
2619
 
                  (mode='wb', suffix=".pickle", prefix='clients-',
2620
 
                   dir=os.path.dirname(stored_state_path),
2621
 
                   delete=False)) as stored_state:
2622
 
                pickle.dump((clients, client_settings), stored_state)
2623
 
                tempname=stored_state.name
2624
 
            os.rename(tempname, stored_state_path)
2625
 
        except (IOError, OSError) as e:
2626
 
            if not debug:
2627
 
                try:
2628
 
                    os.remove(tempname)
2629
 
                except NameError:
2630
 
                    pass
2631
 
            if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
2632
 
                logger.warning("Could not save persistent state: {0}"
2633
 
                               .format(os.strerror(e.errno)))
2634
 
            else:
2635
 
                logger.warning("Could not save persistent state:",
2636
 
                               exc_info=e)
2637
 
                raise e
2638
 
        
2639
 
        # Delete all clients, and settings from config
2640
 
        while tcp_server.clients:
2641
 
            name, client = tcp_server.clients.popitem()
2642
 
            if use_dbus:
2643
 
                client.remove_from_connection()
2644
 
            # Don't signal anything except ClientRemoved
2645
 
            client.disable(quiet=True)
2646
 
            if use_dbus:
2647
 
                # Emit D-Bus signal
2648
 
                mandos_dbus_service.ClientRemoved(client
2649
 
                                                  .dbus_object_path,
2650
 
                                                  client.name)
2651
 
        client_settings.clear()
2652
 
    
2653
 
    atexit.register(cleanup)
2654
 
    
2655
 
    for client in tcp_server.clients.itervalues():
2656
 
        if use_dbus:
2657
 
            # Emit D-Bus signal
2658
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2659
 
        # Need to initiate checking of clients
2660
 
        if client.enabled:
2661
 
            client.init_checker()
2662
 
    
2663
 
    tcp_server.enable()
2664
 
    tcp_server.server_activate()
2665
 
    
2666
 
    # Find out what port we got
2667
 
    service.port = tcp_server.socket.getsockname()[1]
2668
 
    if use_ipv6:
2669
 
        logger.info("Now listening on address %r, port %d,"
2670
 
                    " flowinfo %d, scope_id %d",
2671
 
                    *tcp_server.socket.getsockname())
2672
 
    else:                       # IPv4
2673
 
        logger.info("Now listening on address %r, port %d",
2674
 
                    *tcp_server.socket.getsockname())
2675
 
    
2676
 
    #service.interface = tcp_server.socket.getsockname()[3]
2677
 
    
 
592
    server = dbus.Interface(
 
593
            bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
 
594
            avahi.DBUS_INTERFACE_SERVER )
 
595
    # End of Avahi example code
 
596
    
 
597
    debug = options.debug
 
598
    
 
599
    clients = Set()
 
600
    def remove_from_clients(client):
 
601
        clients.remove(client)
 
602
        if not clients:
 
603
            logger.debug(u"No clients left, exiting")
 
604
            main_loop.quit()
 
605
    
 
606
    clients.update(Set(Client(name=section, options=options,
 
607
                              stop_hook = remove_from_clients,
 
608
                              **(dict(client_config\
 
609
                                      .items(section))))
 
610
                       for section in client_config.sections()))
 
611
    for client in clients:
 
612
        client.start()
 
613
    
 
614
    tcp_server = IPv6_TCPServer((None, options.port),
 
615
                                tcp_handler,
 
616
                                options=options,
 
617
                                clients=clients)
 
618
    # Find out what random port we got
 
619
    servicePort = tcp_server.socket.getsockname()[1]
 
620
    logger.debug(u"Now listening on port %d", servicePort)
 
621
    
 
622
    if options.interface is not None:
 
623
        serviceInterface = if_nametoindex(options.interface)
 
624
    
 
625
    # From the Avahi server example code
 
626
    server.connect_to_signal("StateChanged", server_state_changed)
 
627
    server_state_changed(server.GetState())
 
628
    # End of Avahi example code
 
629
    
 
630
    gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
 
631
                         lambda *args, **kwargs:
 
632
                         tcp_server.handle_request(*args[2:],
 
633
                                                   **kwargs) or True)
2678
634
    try:
2679
 
        # From the Avahi example code
2680
 
        try:
2681
 
            service.activate()
2682
 
        except dbus.exceptions.DBusException as error:
2683
 
            logger.critical("D-Bus Exception", exc_info=error)
2684
 
            cleanup()
2685
 
            sys.exit(1)
2686
 
        # End of Avahi example code
2687
 
        
2688
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2689
 
                             lambda *args, **kwargs:
2690
 
                             (tcp_server.handle_request
2691
 
                              (*args[2:], **kwargs) or True))
2692
 
        
2693
 
        logger.debug("Starting main loop")
2694
635
        main_loop.run()
2695
 
    except AvahiError as error:
2696
 
        logger.critical("Avahi Error", exc_info=error)
2697
 
        cleanup()
2698
 
        sys.exit(1)
2699
636
    except KeyboardInterrupt:
2700
 
        if debug:
2701
 
            print("", file=sys.stderr)
2702
 
        logger.debug("Server received KeyboardInterrupt")
2703
 
    logger.debug("Server exiting")
2704
 
    # Must run before the D-Bus bus name gets deregistered
2705
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
2706
640
 
2707
 
if __name__ == '__main__':
2708
 
    main()
 
641
    # From the Avahi server example code
 
642
    if not group is None:
 
643
        group.Free()
 
644
    # End of Avahi example code
 
645
    
 
646
    for client in clients:
 
647
        client.stop_hook = None
 
648
        client.stop()