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

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1
#!/usr/bin/python
2
 
# -*- mode: python; coding: utf-8 -*-
3
 
4
 
# Mandos server - give out binary blobs to connecting clients.
5
 
6
 
# This program is partly derived from an example program for an Avahi
7
 
# service publisher, downloaded from
8
 
# <http://avahi.org/wiki/PythonPublishExample>.  This includes the
9
 
# methods "add", "remove", "server_state_changed",
10
 
# "entry_group_state_changed", "cleanup", and "activate" in the
11
 
# "AvahiService" class, and some lines in "main".
12
 
13
 
# Everything else is
14
 
# Copyright © 2008-2012 Teddy Hogeborn
15
 
# Copyright © 2008-2012 Björn Påhlsson
16
 
17
 
# This program is free software: you can redistribute it and/or modify
18
 
# it under the terms of the GNU General Public License as published by
19
 
# the Free Software Foundation, either version 3 of the License, or
20
 
# (at your option) any later version.
21
 
#
22
 
#     This program is distributed in the hope that it will be useful,
23
 
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
24
 
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25
 
#     GNU General Public License for more details.
26
 
27
 
# You should have received a copy of the GNU General Public License
28
 
# along with this program.  If not, see
29
 
# <http://www.gnu.org/licenses/>.
30
 
31
 
# Contact the authors at <mandos@recompile.se>.
32
 
33
 
 
34
 
from __future__ import (division, absolute_import, print_function,
35
 
                        unicode_literals)
36
 
 
37
 
import SocketServer as socketserver
 
2
 
 
3
from __future__ import division
 
4
 
 
5
import SocketServer
38
6
import socket
39
 
import argparse
 
7
import select
 
8
from optparse import OptionParser
40
9
import datetime
41
10
import errno
42
11
import gnutls.crypto
45
14
import gnutls.library.functions
46
15
import gnutls.library.constants
47
16
import gnutls.library.types
48
 
import ConfigParser as configparser
 
17
import ConfigParser
49
18
import sys
50
19
import re
51
20
import os
52
21
import signal
 
22
from sets import Set
53
23
import subprocess
54
 
import atexit
55
 
import stat
56
 
import logging
57
 
import logging.handlers
58
 
import pwd
59
 
import contextlib
60
 
import struct
61
 
import fcntl
62
 
import functools
63
 
import cPickle as pickle
64
 
import multiprocessing
65
 
import types
66
 
import binascii
67
 
import tempfile
68
24
 
69
25
import dbus
70
 
import dbus.service
71
26
import gobject
72
27
import avahi
73
28
from dbus.mainloop.glib import DBusGMainLoop
74
29
import ctypes
75
 
import ctypes.util
76
 
import xml.dom.minidom
77
 
import inspect
78
 
import GnuPGInterface
79
 
 
80
 
try:
81
 
    SO_BINDTODEVICE = socket.SO_BINDTODEVICE
82
 
except AttributeError:
83
 
    try:
84
 
        from IN import SO_BINDTODEVICE
85
 
    except ImportError:
86
 
        SO_BINDTODEVICE = None
87
 
 
88
 
version = "1.5.2"
89
 
stored_state_file = "clients.pickle"
90
 
 
91
 
logger = logging.getLogger()
92
 
syslogger = (logging.handlers.SysLogHandler
93
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
94
 
              address = str("/dev/log")))
95
 
 
96
 
try:
97
 
    if_nametoindex = (ctypes.cdll.LoadLibrary
98
 
                      (ctypes.util.find_library("c"))
99
 
                      .if_nametoindex)
100
 
except (OSError, AttributeError):
101
 
    def if_nametoindex(interface):
102
 
        "Get an interface index the hard way, i.e. using fcntl()"
103
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
104
 
        with contextlib.closing(socket.socket()) as s:
105
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
106
 
                                struct.pack(str("16s16x"),
107
 
                                            interface))
108
 
        interface_index = struct.unpack(str("I"),
109
 
                                        ifreq[16:20])[0]
110
 
        return interface_index
111
 
 
112
 
 
113
 
def initlogger(debug, level=logging.WARNING):
114
 
    """init logger and add loglevel"""
115
 
    
116
 
    syslogger.setFormatter(logging.Formatter
117
 
                           ('Mandos [%(process)d]: %(levelname)s:'
118
 
                            ' %(message)s'))
119
 
    logger.addHandler(syslogger)
120
 
    
121
 
    if debug:
122
 
        console = logging.StreamHandler()
123
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
124
 
                                               ' [%(process)d]:'
125
 
                                               ' %(levelname)s:'
126
 
                                               ' %(message)s'))
127
 
        logger.addHandler(console)
128
 
    logger.setLevel(level)
129
 
 
130
 
 
131
 
class PGPError(Exception):
132
 
    """Exception if encryption/decryption fails"""
133
 
    pass
134
 
 
135
 
 
136
 
class PGPEngine(object):
137
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
138
 
    def __init__(self):
139
 
        self.gnupg = GnuPGInterface.GnuPG()
140
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
141
 
        self.gnupg = GnuPGInterface.GnuPG()
142
 
        self.gnupg.options.meta_interactive = False
143
 
        self.gnupg.options.homedir = self.tempdir
144
 
        self.gnupg.options.extra_args.extend(['--force-mdc',
145
 
                                              '--quiet',
146
 
                                              '--no-use-agent'])
147
 
    
148
 
    def __enter__(self):
149
 
        return self
150
 
    
151
 
    def __exit__ (self, exc_type, exc_value, traceback):
152
 
        self._cleanup()
153
 
        return False
154
 
    
155
 
    def __del__(self):
156
 
        self._cleanup()
157
 
    
158
 
    def _cleanup(self):
159
 
        if self.tempdir is not None:
160
 
            # Delete contents of tempdir
161
 
            for root, dirs, files in os.walk(self.tempdir,
162
 
                                             topdown = False):
163
 
                for filename in files:
164
 
                    os.remove(os.path.join(root, filename))
165
 
                for dirname in dirs:
166
 
                    os.rmdir(os.path.join(root, dirname))
167
 
            # Remove tempdir
168
 
            os.rmdir(self.tempdir)
169
 
            self.tempdir = None
170
 
    
171
 
    def password_encode(self, password):
172
 
        # Passphrase can not be empty and can not contain newlines or
173
 
        # NUL bytes.  So we prefix it and hex encode it.
174
 
        return b"mandos" + binascii.hexlify(password)
175
 
    
176
 
    def encrypt(self, data, password):
177
 
        self.gnupg.passphrase = self.password_encode(password)
178
 
        with open(os.devnull) as devnull:
179
 
            try:
180
 
                proc = self.gnupg.run(['--symmetric'],
181
 
                                      create_fhs=['stdin', 'stdout'],
182
 
                                      attach_fhs={'stderr': devnull})
183
 
                with contextlib.closing(proc.handles['stdin']) as f:
184
 
                    f.write(data)
185
 
                with contextlib.closing(proc.handles['stdout']) as f:
186
 
                    ciphertext = f.read()
187
 
                proc.wait()
188
 
            except IOError as e:
189
 
                raise PGPError(e)
190
 
        self.gnupg.passphrase = None
191
 
        return ciphertext
192
 
    
193
 
    def decrypt(self, data, password):
194
 
        self.gnupg.passphrase = self.password_encode(password)
195
 
        with open(os.devnull) as devnull:
196
 
            try:
197
 
                proc = self.gnupg.run(['--decrypt'],
198
 
                                      create_fhs=['stdin', 'stdout'],
199
 
                                      attach_fhs={'stderr': devnull})
200
 
                with contextlib.closing(proc.handles['stdin'] ) as f:
201
 
                    f.write(data)
202
 
                with contextlib.closing(proc.handles['stdout']) as f:
203
 
                    decrypted_plaintext = f.read()
204
 
                proc.wait()
205
 
            except IOError as e:
206
 
                raise PGPError(e)
207
 
        self.gnupg.passphrase = None
208
 
        return decrypted_plaintext
209
 
 
210
 
 
211
 
 
212
 
class AvahiError(Exception):
213
 
    def __init__(self, value, *args, **kwargs):
214
 
        self.value = value
215
 
        super(AvahiError, self).__init__(value, *args, **kwargs)
216
 
    def __unicode__(self):
217
 
        return unicode(repr(self.value))
218
 
 
219
 
class AvahiServiceError(AvahiError):
220
 
    pass
221
 
 
222
 
class AvahiGroupError(AvahiError):
223
 
    pass
224
 
 
225
 
 
226
 
class AvahiService(object):
227
 
    """An Avahi (Zeroconf) service.
228
 
    
229
 
    Attributes:
230
 
    interface: integer; avahi.IF_UNSPEC or an interface index.
231
 
               Used to optionally bind to the specified interface.
232
 
    name: string; Example: 'Mandos'
233
 
    type: string; Example: '_mandos._tcp'.
234
 
                  See <http://www.dns-sd.org/ServiceTypes.html>
235
 
    port: integer; what port to announce
236
 
    TXT: list of strings; TXT record for the service
237
 
    domain: string; Domain to publish on, default to .local if empty.
238
 
    host: string; Host to publish records for, default is localhost
239
 
    max_renames: integer; maximum number of renames
240
 
    rename_count: integer; counter so we only rename after collisions
241
 
                  a sensible number of times
242
 
    group: D-Bus Entry Group
243
 
    server: D-Bus Server
244
 
    bus: dbus.SystemBus()
245
 
    """
246
 
    def __init__(self, interface = avahi.IF_UNSPEC, name = None,
247
 
                 servicetype = None, port = None, TXT = None,
248
 
                 domain = "", host = "", max_renames = 32768,
249
 
                 protocol = avahi.PROTO_UNSPEC, bus = None):
250
 
        self.interface = interface
251
 
        self.name = name
252
 
        self.type = servicetype
253
 
        self.port = port
254
 
        self.TXT = TXT if TXT is not None else []
255
 
        self.domain = domain
256
 
        self.host = host
257
 
        self.rename_count = 0
258
 
        self.max_renames = max_renames
259
 
        self.protocol = protocol
260
 
        self.group = None       # our entry group
261
 
        self.server = None
262
 
        self.bus = bus
263
 
        self.entry_group_state_changed_match = None
264
 
    def rename(self):
265
 
        """Derived from the Avahi example code"""
266
 
        if self.rename_count >= self.max_renames:
267
 
            logger.critical("No suitable Zeroconf service name found"
268
 
                            " after %i retries, exiting.",
269
 
                            self.rename_count)
270
 
            raise AvahiServiceError("Too many renames")
271
 
        self.name = unicode(self.server
272
 
                            .GetAlternativeServiceName(self.name))
273
 
        logger.info("Changing Zeroconf service name to %r ...",
274
 
                    self.name)
275
 
        self.remove()
276
 
        try:
277
 
            self.add()
278
 
        except dbus.exceptions.DBusException as error:
279
 
            logger.critical("DBusException: %s", error)
280
 
            self.cleanup()
281
 
            os._exit(1)
282
 
        self.rename_count += 1
283
 
    def remove(self):
284
 
        """Derived from the Avahi example code"""
285
 
        if self.entry_group_state_changed_match is not None:
286
 
            self.entry_group_state_changed_match.remove()
287
 
            self.entry_group_state_changed_match = None
288
 
        if self.group is not None:
289
 
            self.group.Reset()
290
 
    def add(self):
291
 
        """Derived from the Avahi example code"""
292
 
        self.remove()
293
 
        if self.group is None:
294
 
            self.group = dbus.Interface(
295
 
                self.bus.get_object(avahi.DBUS_NAME,
296
 
                                    self.server.EntryGroupNew()),
297
 
                avahi.DBUS_INTERFACE_ENTRY_GROUP)
298
 
        self.entry_group_state_changed_match = (
299
 
            self.group.connect_to_signal(
300
 
                'StateChanged', self.entry_group_state_changed))
301
 
        logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
302
 
                     self.name, self.type)
303
 
        self.group.AddService(
304
 
            self.interface,
305
 
            self.protocol,
306
 
            dbus.UInt32(0),     # flags
307
 
            self.name, self.type,
308
 
            self.domain, self.host,
309
 
            dbus.UInt16(self.port),
310
 
            avahi.string_array_to_txt_array(self.TXT))
311
 
        self.group.Commit()
312
 
    def entry_group_state_changed(self, state, error):
313
 
        """Derived from the Avahi example code"""
314
 
        logger.debug("Avahi entry group state change: %i", state)
315
 
        
316
 
        if state == avahi.ENTRY_GROUP_ESTABLISHED:
317
 
            logger.debug("Zeroconf service established.")
318
 
        elif state == avahi.ENTRY_GROUP_COLLISION:
319
 
            logger.info("Zeroconf service name collision.")
320
 
            self.rename()
321
 
        elif state == avahi.ENTRY_GROUP_FAILURE:
322
 
            logger.critical("Avahi: Error in group state changed %s",
323
 
                            unicode(error))
324
 
            raise AvahiGroupError("State changed: %s"
325
 
                                  % unicode(error))
326
 
    def cleanup(self):
327
 
        """Derived from the Avahi example code"""
328
 
        if self.group is not None:
329
 
            try:
330
 
                self.group.Free()
331
 
            except (dbus.exceptions.UnknownMethodException,
332
 
                    dbus.exceptions.DBusException):
333
 
                pass
334
 
            self.group = None
335
 
        self.remove()
336
 
    def server_state_changed(self, state, error=None):
337
 
        """Derived from the Avahi example code"""
338
 
        logger.debug("Avahi server state change: %i", state)
339
 
        bad_states = { avahi.SERVER_INVALID:
340
 
                           "Zeroconf server invalid",
341
 
                       avahi.SERVER_REGISTERING: None,
342
 
                       avahi.SERVER_COLLISION:
343
 
                           "Zeroconf server name collision",
344
 
                       avahi.SERVER_FAILURE:
345
 
                           "Zeroconf server failure" }
346
 
        if state in bad_states:
347
 
            if bad_states[state] is not None:
348
 
                if error is None:
349
 
                    logger.error(bad_states[state])
350
 
                else:
351
 
                    logger.error(bad_states[state] + ": %r", error)
352
 
            self.cleanup()
353
 
        elif state == avahi.SERVER_RUNNING:
354
 
            self.add()
355
 
        else:
356
 
            if error is None:
357
 
                logger.debug("Unknown state: %r", state)
358
 
            else:
359
 
                logger.debug("Unknown state: %r: %r", state, error)
360
 
    def activate(self):
361
 
        """Derived from the Avahi example code"""
362
 
        if self.server is None:
363
 
            self.server = dbus.Interface(
364
 
                self.bus.get_object(avahi.DBUS_NAME,
365
 
                                    avahi.DBUS_PATH_SERVER,
366
 
                                    follow_name_owner_changes=True),
367
 
                avahi.DBUS_INTERFACE_SERVER)
368
 
        self.server.connect_to_signal("StateChanged",
369
 
                                 self.server_state_changed)
370
 
        self.server_state_changed(self.server.GetState())
371
 
 
372
 
class AvahiServiceToSyslog(AvahiService):
373
 
    def rename(self):
374
 
        """Add the new name to the syslog messages"""
375
 
        ret = AvahiService.rename(self)
376
 
        syslogger.setFormatter(logging.Formatter
377
 
                               ('Mandos (%s) [%%(process)d]:'
378
 
                                ' %%(levelname)s: %%(message)s'
379
 
                                % self.name))
380
 
        return ret
381
 
 
382
 
def timedelta_to_milliseconds(td):
383
 
    "Convert a datetime.timedelta() to milliseconds"
384
 
    return ((td.days * 24 * 60 * 60 * 1000)
385
 
            + (td.seconds * 1000)
386
 
            + (td.microseconds // 1000))
387
 
        
 
30
 
 
31
import logging
 
32
import logging.handlers
 
33
 
 
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
 
35
 
 
36
logger = logging.Logger('mandos')
 
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
 
38
 
 
39
# This variable is used to optionally bind to a specified interface.
 
40
# It is a global variable to fit in with the other variables from the
 
41
# Avahi server example code.
 
42
serviceInterface = avahi.IF_UNSPEC
 
43
# From the Avahi server example code:
 
44
serviceName = "Mandos"
 
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
 
46
servicePort = None                      # Not known at startup
 
47
serviceTXT = []                         # TXT record for the service
 
48
domain = ""                  # Domain to publish on, default to .local
 
49
host = ""          # Host to publish records for, default to localhost
 
50
group = None #our entry group
 
51
rename_count = 12       # Counter so we only rename after collisions a
 
52
                        # sensible number of times
 
53
# End of Avahi example code
 
54
 
 
55
 
388
56
class Client(object):
389
57
    """A representation of a client host served by this server.
390
 
    
391
58
    Attributes:
392
 
    approved:   bool(); 'None' if not yet approved/disapproved
393
 
    approval_delay: datetime.timedelta(); Time to wait for approval
394
 
    approval_duration: datetime.timedelta(); Duration of one approval
395
 
    checker:    subprocess.Popen(); a running checker process used
396
 
                                    to see if the client lives.
397
 
                                    'None' if no process is running.
398
 
    checker_callback_tag: a gobject event source tag, or None
399
 
    checker_command: string; External command which is run to check
400
 
                     if client lives.  %() expansions are done at
 
59
    name:      string; from the config file, used in log messages
 
60
    fingerprint: string (40 or 32 hexadecimal digits); used to
 
61
                 uniquely identify the client
 
62
    secret:    bytestring; sent verbatim (over TLS) to client
 
63
    fqdn:      string (FQDN); available for use by the checker command
 
64
    created:   datetime.datetime()
 
65
    last_seen: datetime.datetime() or None if not yet seen
 
66
    timeout:   datetime.timedelta(); How long from last_seen until
 
67
                                     this client is invalid
 
68
    interval:  datetime.timedelta(); How often to start a new checker
 
69
    stop_hook: If set, called by stop() as stop_hook(self)
 
70
    checker:   subprocess.Popen(); a running checker process used
 
71
                                   to see if the client lives.
 
72
                                   Is None if no process is running.
 
73
    checker_initiator_tag: a gobject event source tag, or None
 
74
    stop_initiator_tag:    - '' -
 
75
    checker_callback_tag:  - '' -
 
76
    checker_command: string; External command which is run to check if
 
77
                     client lives.  %()s expansions are done at
401
78
                     runtime with vars(self) as dict, so that for
402
79
                     instance %(name)s can be used in the command.
403
 
    checker_initiator_tag: a gobject event source tag, or None
404
 
    created:    datetime.datetime(); (UTC) object creation
405
 
    client_structure: Object describing what attributes a client has
406
 
                      and is used for storing the client at exit
407
 
    current_checker_command: string; current running checker_command
408
 
    disable_initiator_tag: a gobject event source tag, or None
409
 
    enabled:    bool()
410
 
    fingerprint: string (40 or 32 hexadecimal digits); used to
411
 
                 uniquely identify the client
412
 
    host:       string; available for use by the checker command
413
 
    interval:   datetime.timedelta(); How often to start a new checker
414
 
    last_approval_request: datetime.datetime(); (UTC) or None
415
 
    last_checked_ok: datetime.datetime(); (UTC) or None
416
 
    last_checker_status: integer between 0 and 255 reflecting exit
417
 
                         status of last checker. -1 reflects crashed
418
 
                         checker, or None.
419
 
    last_enabled: datetime.datetime(); (UTC) or None
420
 
    name:       string; from the config file, used in log messages and
421
 
                        D-Bus identifiers
422
 
    secret:     bytestring; sent verbatim (over TLS) to client
423
 
    timeout:    datetime.timedelta(); How long from last_checked_ok
424
 
                                      until this client is disabled
425
 
    extended_timeout:   extra long timeout when secret has been sent
426
 
    runtime_expansions: Allowed attributes for runtime expansion.
427
 
    expires:    datetime.datetime(); time (UTC) when a client will be
428
 
                disabled, or None
 
80
    Private attibutes:
 
81
    _timeout: Real variable for 'timeout'
 
82
    _interval: Real variable for 'interval'
 
83
    _timeout_milliseconds: Used by gobject.timeout_add()
 
84
    _interval_milliseconds: - '' -
429
85
    """
430
 
    
431
 
    runtime_expansions = ("approval_delay", "approval_duration",
432
 
                          "created", "enabled", "fingerprint",
433
 
                          "host", "interval", "last_checked_ok",
434
 
                          "last_enabled", "name", "timeout")
435
 
    client_defaults = { "timeout": "5m",
436
 
                        "extended_timeout": "15m",
437
 
                        "interval": "2m",
438
 
                        "checker": "fping -q -- %%(host)s",
439
 
                        "host": "",
440
 
                        "approval_delay": "0s",
441
 
                        "approval_duration": "1s",
442
 
                        "approved_by_default": "True",
443
 
                        "enabled": "True",
444
 
                        }
445
 
    
446
 
    def timeout_milliseconds(self):
447
 
        "Return the 'timeout' attribute in milliseconds"
448
 
        return timedelta_to_milliseconds(self.timeout)
449
 
    
450
 
    def extended_timeout_milliseconds(self):
451
 
        "Return the 'extended_timeout' attribute in milliseconds"
452
 
        return timedelta_to_milliseconds(self.extended_timeout)
453
 
    
454
 
    def interval_milliseconds(self):
455
 
        "Return the 'interval' attribute in milliseconds"
456
 
        return timedelta_to_milliseconds(self.interval)
457
 
    
458
 
    def approval_delay_milliseconds(self):
459
 
        return timedelta_to_milliseconds(self.approval_delay)
460
 
 
461
 
    @staticmethod
462
 
    def config_parser(config):
463
 
        """Construct a new dict of client settings of this form:
464
 
        { client_name: {setting_name: value, ...}, ...}
465
 
        with exceptions for any special settings as defined above.
466
 
        NOTE: Must be a pure function. Must return the same result
467
 
        value given the same arguments.
468
 
        """
469
 
        settings = {}
470
 
        for client_name in config.sections():
471
 
            section = dict(config.items(client_name))
472
 
            client = settings[client_name] = {}
473
 
            
474
 
            client["host"] = section["host"]
475
 
            # Reformat values from string types to Python types
476
 
            client["approved_by_default"] = config.getboolean(
477
 
                client_name, "approved_by_default")
478
 
            client["enabled"] = config.getboolean(client_name,
479
 
                                                  "enabled")
480
 
            
481
 
            client["fingerprint"] = (section["fingerprint"].upper()
482
 
                                     .replace(" ", ""))
483
 
            if "secret" in section:
484
 
                client["secret"] = section["secret"].decode("base64")
485
 
            elif "secfile" in section:
486
 
                with open(os.path.expanduser(os.path.expandvars
487
 
                                             (section["secfile"])),
488
 
                          "rb") as secfile:
489
 
                    client["secret"] = secfile.read()
490
 
            else:
491
 
                raise TypeError("No secret or secfile for section %s"
492
 
                                % section)
493
 
            client["timeout"] = string_to_delta(section["timeout"])
494
 
            client["extended_timeout"] = string_to_delta(
495
 
                section["extended_timeout"])
496
 
            client["interval"] = string_to_delta(section["interval"])
497
 
            client["approval_delay"] = string_to_delta(
498
 
                section["approval_delay"])
499
 
            client["approval_duration"] = string_to_delta(
500
 
                section["approval_duration"])
501
 
            client["checker_command"] = section["checker"]
502
 
            client["last_approval_request"] = None
503
 
            client["last_checked_ok"] = None
504
 
            client["last_checker_status"] = None
505
 
        
506
 
        return settings
507
 
        
508
 
        
509
 
    def __init__(self, settings, name = None):
510
 
        """Note: the 'checker' key in 'config' sets the
511
 
        'checker_command' attribute and *not* the 'checker'
512
 
        attribute."""
 
86
    def _set_timeout(self, timeout):
 
87
        "Setter function for 'timeout' attribute"
 
88
        self._timeout = timeout
 
89
        self._timeout_milliseconds = ((self.timeout.days
 
90
                                       * 24 * 60 * 60 * 1000)
 
91
                                      + (self.timeout.seconds * 1000)
 
92
                                      + (self.timeout.microseconds
 
93
                                         // 1000))
 
94
    timeout = property(lambda self: self._timeout,
 
95
                       _set_timeout)
 
96
    del _set_timeout
 
97
    def _set_interval(self, interval):
 
98
        "Setter function for 'interval' attribute"
 
99
        self._interval = interval
 
100
        self._interval_milliseconds = ((self.interval.days
 
101
                                        * 24 * 60 * 60 * 1000)
 
102
                                       + (self.interval.seconds
 
103
                                          * 1000)
 
104
                                       + (self.interval.microseconds
 
105
                                          // 1000))
 
106
    interval = property(lambda self: self._interval,
 
107
                        _set_interval)
 
108
    del _set_interval
 
109
    def __init__(self, name=None, options=None, stop_hook=None,
 
110
                 fingerprint=None, secret=None, secfile=None, fqdn=None,
 
111
                 timeout=None, interval=-1, checker=None):
513
112
        self.name = name
514
 
        # adding all client settings
515
 
        for setting, value in settings.iteritems():
516
 
            setattr(self, setting, value)
517
 
        
518
 
        if self.enabled:
519
 
            if not hasattr(self, "last_enabled"):
520
 
                self.last_enabled = datetime.datetime.utcnow()
521
 
            if not hasattr(self, "expires"):
522
 
                self.expires = (datetime.datetime.utcnow()
523
 
                                + self.timeout)
524
 
        else:
525
 
            self.last_enabled = None
526
 
            self.expires = None
527
 
       
528
 
        logger.debug("Creating client %r", self.name)
529
 
        # Uppercase and remove spaces from fingerprint for later
530
 
        # comparison purposes with return value from the fingerprint()
531
 
        # function
532
 
        logger.debug("  Fingerprint: %s", self.fingerprint)
533
 
        self.created = settings.get("created",
534
 
                                    datetime.datetime.utcnow())
535
 
 
536
 
        # attributes specific for this server instance
 
113
        # Uppercase and remove spaces from fingerprint
 
114
        # for later comparison purposes with return value of
 
115
        # the fingerprint() function
 
116
        self.fingerprint = fingerprint.upper().replace(u" ", u"")
 
117
        if secret:
 
118
            self.secret = secret.decode(u"base64")
 
119
        elif secfile:
 
120
            sf = open(secfile)
 
121
            self.secret = sf.read()
 
122
            sf.close()
 
123
        else:
 
124
            raise RuntimeError(u"No secret or secfile for client %s"
 
125
                               % self.name)
 
126
        self.fqdn = fqdn                # string
 
127
        self.created = datetime.datetime.now()
 
128
        self.last_seen = None
 
129
        if timeout is None:
 
130
            timeout = options.timeout
 
131
        self.timeout = timeout
 
132
        if interval == -1:
 
133
            interval = options.interval
 
134
        else:
 
135
            interval = string_to_delta(interval)
 
136
        self.interval = interval
 
137
        self.stop_hook = stop_hook
537
138
        self.checker = None
538
139
        self.checker_initiator_tag = None
539
 
        self.disable_initiator_tag = None
 
140
        self.stop_initiator_tag = None
540
141
        self.checker_callback_tag = None
541
 
        self.current_checker_command = None
542
 
        self.approved = None
543
 
        self.approvals_pending = 0
544
 
        self.changedstate = (multiprocessing_manager
545
 
                             .Condition(multiprocessing_manager
546
 
                                        .Lock()))
547
 
        self.client_structure = [attr for attr in
548
 
                                 self.__dict__.iterkeys()
549
 
                                 if not attr.startswith("_")]
550
 
        self.client_structure.append("client_structure")
551
 
        
552
 
        for name, t in inspect.getmembers(type(self),
553
 
                                          lambda obj:
554
 
                                              isinstance(obj,
555
 
                                                         property)):
556
 
            if not name.startswith("_"):
557
 
                self.client_structure.append(name)
558
 
    
559
 
    # Send notice to process children that client state has changed
560
 
    def send_changedstate(self):
561
 
        with self.changedstate:
562
 
            self.changedstate.notify_all()
563
 
    
564
 
    def enable(self):
565
 
        """Start this client's checker and timeout hooks"""
566
 
        if getattr(self, "enabled", False):
567
 
            # Already enabled
568
 
            return
569
 
        self.send_changedstate()
570
 
        self.expires = datetime.datetime.utcnow() + self.timeout
571
 
        self.enabled = True
572
 
        self.last_enabled = datetime.datetime.utcnow()
573
 
        self.init_checker()
574
 
    
575
 
    def disable(self, quiet=True):
576
 
        """Disable this client."""
577
 
        if not getattr(self, "enabled", False):
578
 
            return False
579
 
        if not quiet:
580
 
            self.send_changedstate()
581
 
        if not quiet:
582
 
            logger.info("Disabling client %s", self.name)
583
 
        if getattr(self, "disable_initiator_tag", False):
584
 
            gobject.source_remove(self.disable_initiator_tag)
585
 
            self.disable_initiator_tag = None
586
 
        self.expires = None
587
 
        if getattr(self, "checker_initiator_tag", False):
588
 
            gobject.source_remove(self.checker_initiator_tag)
589
 
            self.checker_initiator_tag = None
590
 
        self.stop_checker()
591
 
        self.enabled = False
592
 
        # Do not run this again if called by a gobject.timeout_add
593
 
        return False
594
 
    
595
 
    def __del__(self):
596
 
        self.disable()
597
 
    
598
 
    def init_checker(self):
 
142
        self.check_command = checker
 
143
    def start(self):
 
144
        """Start this clients checker and timeout hooks"""
599
145
        # Schedule a new checker to be started an 'interval' from now,
600
146
        # and every interval from then on.
601
 
        self.checker_initiator_tag = (gobject.timeout_add
602
 
                                      (self.interval_milliseconds(),
603
 
                                       self.start_checker))
604
 
        # Schedule a disable() when 'timeout' has passed
605
 
        self.disable_initiator_tag = (gobject.timeout_add
606
 
                                   (self.timeout_milliseconds(),
607
 
                                    self.disable))
 
147
        self.checker_initiator_tag = gobject.timeout_add\
 
148
                                     (self._interval_milliseconds,
 
149
                                      self.start_checker)
608
150
        # Also start a new checker *right now*.
609
151
        self.start_checker()
610
 
    
611
 
    def checker_callback(self, pid, condition, command):
 
152
        # Schedule a stop() when 'timeout' has passed
 
153
        self.stop_initiator_tag = gobject.timeout_add\
 
154
                                  (self._timeout_milliseconds,
 
155
                                   self.stop)
 
156
    def stop(self):
 
157
        """Stop this client.
 
158
        The possibility that this client might be restarted is left
 
159
        open, but not currently used."""
 
160
        logger.debug(u"Stopping client %s", self.name)
 
161
        self.secret = None
 
162
        if self.stop_initiator_tag:
 
163
            gobject.source_remove(self.stop_initiator_tag)
 
164
            self.stop_initiator_tag = None
 
165
        if self.checker_initiator_tag:
 
166
            gobject.source_remove(self.checker_initiator_tag)
 
167
            self.checker_initiator_tag = None
 
168
        self.stop_checker()
 
169
        if self.stop_hook:
 
170
            self.stop_hook(self)
 
171
        # Do not run this again if called by a gobject.timeout_add
 
172
        return False
 
173
    def __del__(self):
 
174
        # Some code duplication here and in stop()
 
175
        if hasattr(self, "stop_initiator_tag") \
 
176
               and self.stop_initiator_tag:
 
177
            gobject.source_remove(self.stop_initiator_tag)
 
178
            self.stop_initiator_tag = None
 
179
        if hasattr(self, "checker_initiator_tag") \
 
180
               and self.checker_initiator_tag:
 
181
            gobject.source_remove(self.checker_initiator_tag)
 
182
            self.checker_initiator_tag = None
 
183
        self.stop_checker()
 
184
    def checker_callback(self, pid, condition):
612
185
        """The checker has completed, so take appropriate actions."""
613
 
        self.checker_callback_tag = None
614
 
        self.checker = None
615
 
        if os.WIFEXITED(condition):
616
 
            self.last_checker_status = os.WEXITSTATUS(condition)
617
 
            if self.last_checker_status == 0:
618
 
                logger.info("Checker for %(name)s succeeded",
619
 
                            vars(self))
620
 
                self.checked_ok()
621
 
            else:
622
 
                logger.info("Checker for %(name)s failed",
623
 
                            vars(self))
624
 
        else:
625
 
            self.last_checker_status = -1
626
 
            logger.warning("Checker for %(name)s crashed?",
 
186
        now = datetime.datetime.now()
 
187
        if os.WIFEXITED(condition) \
 
188
               and (os.WEXITSTATUS(condition) == 0):
 
189
            logger.debug(u"Checker for %(name)s succeeded",
 
190
                         vars(self))
 
191
            self.last_seen = now
 
192
            gobject.source_remove(self.stop_initiator_tag)
 
193
            self.stop_initiator_tag = gobject.timeout_add\
 
194
                                      (self._timeout_milliseconds,
 
195
                                       self.stop)
 
196
        if not os.WIFEXITED(condition):
 
197
            logger.warning(u"Checker for %(name)s crashed?",
627
198
                           vars(self))
628
 
    
629
 
    def checked_ok(self, timeout=None):
630
 
        """Bump up the timeout for this client.
631
 
        
632
 
        This should only be called when the client has been seen,
633
 
        alive and well.
634
 
        """
635
 
        if timeout is None:
636
 
            timeout = self.timeout
637
 
        self.last_checked_ok = datetime.datetime.utcnow()
638
 
        if self.disable_initiator_tag is not None:
639
 
            gobject.source_remove(self.disable_initiator_tag)
640
 
        if getattr(self, "enabled", False):
641
 
            self.disable_initiator_tag = (gobject.timeout_add
642
 
                                          (timedelta_to_milliseconds
643
 
                                           (timeout), self.disable))
644
 
            self.expires = datetime.datetime.utcnow() + timeout
645
 
    
646
 
    def need_approval(self):
647
 
        self.last_approval_request = datetime.datetime.utcnow()
648
 
    
 
199
        else:
 
200
            logger.debug(u"Checker for %(name)s failed",
 
201
                         vars(self))
 
202
            self.checker = None
 
203
        self.checker_callback_tag = None
649
204
    def start_checker(self):
650
205
        """Start a new checker subprocess if one is not running.
651
 
        
652
206
        If a checker already exists, leave it running and do
653
207
        nothing."""
654
 
        # The reason for not killing a running checker is that if we
655
 
        # did that, then if a checker (for some reason) started
656
 
        # running slowly and taking more than 'interval' time, the
657
 
        # client would inevitably timeout, since no checker would get
658
 
        # a chance to run to completion.  If we instead leave running
659
 
        # checkers alone, the checker would have to take more time
660
 
        # than 'timeout' for the client to be disabled, which is as it
661
 
        # should be.
662
 
        
663
 
        # If a checker exists, make sure it is not a zombie
664
 
        try:
665
 
            pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
666
 
        except (AttributeError, OSError) as error:
667
 
            if (isinstance(error, OSError)
668
 
                and error.errno != errno.ECHILD):
669
 
                raise error
670
 
        else:
671
 
            if pid:
672
 
                logger.warning("Checker was a zombie")
673
 
                gobject.source_remove(self.checker_callback_tag)
674
 
                self.checker_callback(pid, status,
675
 
                                      self.current_checker_command)
676
 
        # Start a new checker if needed
677
208
        if self.checker is None:
 
209
            logger.debug(u"Starting checker for %s",
 
210
                         self.name)
678
211
            try:
679
 
                # In case checker_command has exactly one % operator
680
 
                command = self.checker_command % self.host
 
212
                command = self.check_command % self.fqdn
681
213
            except TypeError:
682
 
                # Escape attributes for the shell
683
 
                escaped_attrs = dict(
684
 
                    (attr,
685
 
                     re.escape(unicode(str(getattr(self, attr, "")),
686
 
                                       errors=
687
 
                                       'replace')))
688
 
                    for attr in
689
 
                    self.runtime_expansions)
690
 
                
 
214
                escaped_attrs = dict((key, re.escape(str(val)))
 
215
                                     for key, val in
 
216
                                     vars(self).iteritems())
691
217
                try:
692
 
                    command = self.checker_command % escaped_attrs
693
 
                except TypeError as error:
694
 
                    logger.error('Could not format string "%s":'
695
 
                                 ' %s', self.checker_command, error)
 
218
                    command = self.check_command % escaped_attrs
 
219
                except TypeError, error:
 
220
                    logger.critical(u'Could not format string "%s": %s',
 
221
                                    self.check_command, error)
696
222
                    return True # Try again later
697
 
            self.current_checker_command = command
698
223
            try:
699
 
                logger.info("Starting checker %r for %s",
700
 
                            command, self.name)
701
 
                # We don't need to redirect stdout and stderr, since
702
 
                # in normal mode, that is already done by daemon(),
703
 
                # and in debug mode we don't want to.  (Stdin is
704
 
                # always replaced by /dev/null.)
705
 
                self.checker = subprocess.Popen(command,
706
 
                                                close_fds=True,
707
 
                                                shell=True, cwd="/")
708
 
                self.checker_callback_tag = (gobject.child_watch_add
709
 
                                             (self.checker.pid,
710
 
                                              self.checker_callback,
711
 
                                              data=command))
712
 
                # The checker may have completed before the gobject
713
 
                # watch was added.  Check for this.
714
 
                pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
715
 
                if pid:
716
 
                    gobject.source_remove(self.checker_callback_tag)
717
 
                    self.checker_callback(pid, status, command)
718
 
            except OSError as error:
719
 
                logger.error("Failed to start subprocess: %s",
 
224
                self.checker = subprocess.\
 
225
                               Popen(command,
 
226
                                     stdout=subprocess.PIPE,
 
227
                                     close_fds=True, shell=True,
 
228
                                     cwd="/")
 
229
                self.checker_callback_tag = gobject.\
 
230
                                            child_watch_add(self.checker.pid,
 
231
                                                            self.\
 
232
                                                            checker_callback)
 
233
            except subprocess.OSError, error:
 
234
                logger.error(u"Failed to start subprocess: %s",
720
235
                             error)
721
236
        # Re-run this periodically if run by gobject.timeout_add
722
237
        return True
723
 
    
724
238
    def stop_checker(self):
725
239
        """Force the checker process, if any, to stop."""
726
 
        if self.checker_callback_tag:
727
 
            gobject.source_remove(self.checker_callback_tag)
728
 
            self.checker_callback_tag = None
729
 
        if getattr(self, "checker", None) is None:
 
240
        if not hasattr(self, "checker") or self.checker is None:
730
241
            return
731
 
        logger.debug("Stopping checker for %(name)s", vars(self))
732
 
        try:
733
 
            os.kill(self.checker.pid, signal.SIGTERM)
734
 
            #time.sleep(0.5)
735
 
            #if self.checker.poll() is None:
736
 
            #    os.kill(self.checker.pid, signal.SIGKILL)
737
 
        except OSError as error:
738
 
            if error.errno != errno.ESRCH: # No such process
739
 
                raise
740
 
        self.checker = None
741
 
 
742
 
 
743
 
def dbus_service_property(dbus_interface, signature="v",
744
 
                          access="readwrite", byte_arrays=False):
745
 
    """Decorators for marking methods of a DBusObjectWithProperties to
746
 
    become properties on the D-Bus.
747
 
    
748
 
    The decorated method will be called with no arguments by "Get"
749
 
    and with one argument by "Set".
750
 
    
751
 
    The parameters, where they are supported, are the same as
752
 
    dbus.service.method, except there is only "signature", since the
753
 
    type from Get() and the type sent to Set() is the same.
754
 
    """
755
 
    # Encoding deeply encoded byte arrays is not supported yet by the
756
 
    # "Set" method, so we fail early here:
757
 
    if byte_arrays and signature != "ay":
758
 
        raise ValueError("Byte arrays not supported for non-'ay'"
759
 
                         " signature %r" % signature)
760
 
    def decorator(func):
761
 
        func._dbus_is_property = True
762
 
        func._dbus_interface = dbus_interface
763
 
        func._dbus_signature = signature
764
 
        func._dbus_access = access
765
 
        func._dbus_name = func.__name__
766
 
        if func._dbus_name.endswith("_dbus_property"):
767
 
            func._dbus_name = func._dbus_name[:-14]
768
 
        func._dbus_get_args_options = {'byte_arrays': byte_arrays }
769
 
        return func
770
 
    return decorator
771
 
 
772
 
 
773
 
class DBusPropertyException(dbus.exceptions.DBusException):
774
 
    """A base class for D-Bus property-related exceptions
775
 
    """
776
 
    def __unicode__(self):
777
 
        return unicode(str(self))
778
 
 
779
 
 
780
 
class DBusPropertyAccessException(DBusPropertyException):
781
 
    """A property's access permissions disallows an operation.
782
 
    """
783
 
    pass
784
 
 
785
 
 
786
 
class DBusPropertyNotFound(DBusPropertyException):
787
 
    """An attempt was made to access a non-existing property.
788
 
    """
789
 
    pass
790
 
 
791
 
 
792
 
class DBusObjectWithProperties(dbus.service.Object):
793
 
    """A D-Bus object with properties.
794
 
    
795
 
    Classes inheriting from this can use the dbus_service_property
796
 
    decorator to expose methods as D-Bus properties.  It exposes the
797
 
    standard Get(), Set(), and GetAll() methods on the D-Bus.
798
 
    """
799
 
    
800
 
    @staticmethod
801
 
    def _is_dbus_property(obj):
802
 
        return getattr(obj, "_dbus_is_property", False)
803
 
    
804
 
    def _get_all_dbus_properties(self):
805
 
        """Returns a generator of (name, attribute) pairs
806
 
        """
807
 
        return ((prop.__get__(self)._dbus_name, prop.__get__(self))
808
 
                for cls in self.__class__.__mro__
809
 
                for name, prop in
810
 
                inspect.getmembers(cls, self._is_dbus_property))
811
 
    
812
 
    def _get_dbus_property(self, interface_name, property_name):
813
 
        """Returns a bound method if one exists which is a D-Bus
814
 
        property with the specified name and interface.
815
 
        """
816
 
        for cls in  self.__class__.__mro__:
817
 
            for name, value in (inspect.getmembers
818
 
                                (cls, self._is_dbus_property)):
819
 
                if (value._dbus_name == property_name
820
 
                    and value._dbus_interface == interface_name):
821
 
                    return value.__get__(self)
822
 
        
823
 
        # No such property
824
 
        raise DBusPropertyNotFound(self.dbus_object_path + ":"
825
 
                                   + interface_name + "."
826
 
                                   + property_name)
827
 
    
828
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
829
 
                         out_signature="v")
830
 
    def Get(self, interface_name, property_name):
831
 
        """Standard D-Bus property Get() method, see D-Bus standard.
832
 
        """
833
 
        prop = self._get_dbus_property(interface_name, property_name)
834
 
        if prop._dbus_access == "write":
835
 
            raise DBusPropertyAccessException(property_name)
836
 
        value = prop()
837
 
        if not hasattr(value, "variant_level"):
838
 
            return value
839
 
        return type(value)(value, variant_level=value.variant_level+1)
840
 
    
841
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
842
 
    def Set(self, interface_name, property_name, value):
843
 
        """Standard D-Bus property Set() method, see D-Bus standard.
844
 
        """
845
 
        prop = self._get_dbus_property(interface_name, property_name)
846
 
        if prop._dbus_access == "read":
847
 
            raise DBusPropertyAccessException(property_name)
848
 
        if prop._dbus_get_args_options["byte_arrays"]:
849
 
            # The byte_arrays option is not supported yet on
850
 
            # signatures other than "ay".
851
 
            if prop._dbus_signature != "ay":
852
 
                raise ValueError
853
 
            value = dbus.ByteArray(b''.join(chr(byte)
854
 
                                            for byte in value))
855
 
        prop(value)
856
 
    
857
 
    @dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
858
 
                         out_signature="a{sv}")
859
 
    def GetAll(self, interface_name):
860
 
        """Standard D-Bus property GetAll() method, see D-Bus
861
 
        standard.
862
 
        
863
 
        Note: Will not include properties with access="write".
864
 
        """
865
 
        properties = {}
866
 
        for name, prop in self._get_all_dbus_properties():
867
 
            if (interface_name
868
 
                and interface_name != prop._dbus_interface):
869
 
                # Interface non-empty but did not match
870
 
                continue
871
 
            # Ignore write-only properties
872
 
            if prop._dbus_access == "write":
873
 
                continue
874
 
            value = prop()
875
 
            if not hasattr(value, "variant_level"):
876
 
                properties[name] = value
877
 
                continue
878
 
            properties[name] = type(value)(value, variant_level=
879
 
                                           value.variant_level+1)
880
 
        return dbus.Dictionary(properties, signature="sv")
881
 
    
882
 
    @dbus.service.method(dbus.INTROSPECTABLE_IFACE,
883
 
                         out_signature="s",
884
 
                         path_keyword='object_path',
885
 
                         connection_keyword='connection')
886
 
    def Introspect(self, object_path, connection):
887
 
        """Standard D-Bus method, overloaded to insert property tags.
888
 
        """
889
 
        xmlstring = dbus.service.Object.Introspect(self, object_path,
890
 
                                                   connection)
891
 
        try:
892
 
            document = xml.dom.minidom.parseString(xmlstring)
893
 
            def make_tag(document, name, prop):
894
 
                e = document.createElement("property")
895
 
                e.setAttribute("name", name)
896
 
                e.setAttribute("type", prop._dbus_signature)
897
 
                e.setAttribute("access", prop._dbus_access)
898
 
                return e
899
 
            for if_tag in document.getElementsByTagName("interface"):
900
 
                for tag in (make_tag(document, name, prop)
901
 
                            for name, prop
902
 
                            in self._get_all_dbus_properties()
903
 
                            if prop._dbus_interface
904
 
                            == if_tag.getAttribute("name")):
905
 
                    if_tag.appendChild(tag)
906
 
                # Add the names to the return values for the
907
 
                # "org.freedesktop.DBus.Properties" methods
908
 
                if (if_tag.getAttribute("name")
909
 
                    == "org.freedesktop.DBus.Properties"):
910
 
                    for cn in if_tag.getElementsByTagName("method"):
911
 
                        if cn.getAttribute("name") == "Get":
912
 
                            for arg in cn.getElementsByTagName("arg"):
913
 
                                if (arg.getAttribute("direction")
914
 
                                    == "out"):
915
 
                                    arg.setAttribute("name", "value")
916
 
                        elif cn.getAttribute("name") == "GetAll":
917
 
                            for arg in cn.getElementsByTagName("arg"):
918
 
                                if (arg.getAttribute("direction")
919
 
                                    == "out"):
920
 
                                    arg.setAttribute("name", "props")
921
 
            xmlstring = document.toxml("utf-8")
922
 
            document.unlink()
923
 
        except (AttributeError, xml.dom.DOMException,
924
 
                xml.parsers.expat.ExpatError) as error:
925
 
            logger.error("Failed to override Introspection method",
926
 
                         error)
927
 
        return xmlstring
928
 
 
929
 
 
930
 
def datetime_to_dbus (dt, variant_level=0):
931
 
    """Convert a UTC datetime.datetime() to a D-Bus type."""
932
 
    if dt is None:
933
 
        return dbus.String("", variant_level = variant_level)
934
 
    return dbus.String(dt.isoformat(),
935
 
                       variant_level=variant_level)
936
 
 
937
 
 
938
 
class AlternateDBusNamesMetaclass(DBusObjectWithProperties
939
 
                                  .__metaclass__):
940
 
    """Applied to an empty subclass of a D-Bus object, this metaclass
941
 
    will add additional D-Bus attributes matching a certain pattern.
942
 
    """
943
 
    def __new__(mcs, name, bases, attr):
944
 
        # Go through all the base classes which could have D-Bus
945
 
        # methods, signals, or properties in them
946
 
        for base in (b for b in bases
947
 
                     if issubclass(b, dbus.service.Object)):
948
 
            # Go though all attributes of the base class
949
 
            for attrname, attribute in inspect.getmembers(base):
950
 
                # Ignore non-D-Bus attributes, and D-Bus attributes
951
 
                # with the wrong interface name
952
 
                if (not hasattr(attribute, "_dbus_interface")
953
 
                    or not attribute._dbus_interface
954
 
                    .startswith("se.recompile.Mandos")):
955
 
                    continue
956
 
                # Create an alternate D-Bus interface name based on
957
 
                # the current name
958
 
                alt_interface = (attribute._dbus_interface
959
 
                                 .replace("se.recompile.Mandos",
960
 
                                          "se.bsnet.fukt.Mandos"))
961
 
                # Is this a D-Bus signal?
962
 
                if getattr(attribute, "_dbus_is_signal", False):
963
 
                    # Extract the original non-method function by
964
 
                    # black magic
965
 
                    nonmethod_func = (dict(
966
 
                            zip(attribute.func_code.co_freevars,
967
 
                                attribute.__closure__))["func"]
968
 
                                      .cell_contents)
969
 
                    # Create a new, but exactly alike, function
970
 
                    # object, and decorate it to be a new D-Bus signal
971
 
                    # with the alternate D-Bus interface name
972
 
                    new_function = (dbus.service.signal
973
 
                                    (alt_interface,
974
 
                                     attribute._dbus_signature)
975
 
                                    (types.FunctionType(
976
 
                                nonmethod_func.func_code,
977
 
                                nonmethod_func.func_globals,
978
 
                                nonmethod_func.func_name,
979
 
                                nonmethod_func.func_defaults,
980
 
                                nonmethod_func.func_closure)))
981
 
                    # Define a creator of a function to call both the
982
 
                    # old and new functions, so both the old and new
983
 
                    # signals gets sent when the function is called
984
 
                    def fixscope(func1, func2):
985
 
                        """This function is a scope container to pass
986
 
                        func1 and func2 to the "call_both" function
987
 
                        outside of its arguments"""
988
 
                        def call_both(*args, **kwargs):
989
 
                            """This function will emit two D-Bus
990
 
                            signals by calling func1 and func2"""
991
 
                            func1(*args, **kwargs)
992
 
                            func2(*args, **kwargs)
993
 
                        return call_both
994
 
                    # Create the "call_both" function and add it to
995
 
                    # the class
996
 
                    attr[attrname] = fixscope(attribute,
997
 
                                              new_function)
998
 
                # Is this a D-Bus method?
999
 
                elif getattr(attribute, "_dbus_is_method", False):
1000
 
                    # Create a new, but exactly alike, function
1001
 
                    # object.  Decorate it to be a new D-Bus method
1002
 
                    # with the alternate D-Bus interface name.  Add it
1003
 
                    # to the class.
1004
 
                    attr[attrname] = (dbus.service.method
1005
 
                                      (alt_interface,
1006
 
                                       attribute._dbus_in_signature,
1007
 
                                       attribute._dbus_out_signature)
1008
 
                                      (types.FunctionType
1009
 
                                       (attribute.func_code,
1010
 
                                        attribute.func_globals,
1011
 
                                        attribute.func_name,
1012
 
                                        attribute.func_defaults,
1013
 
                                        attribute.func_closure)))
1014
 
                # Is this a D-Bus property?
1015
 
                elif getattr(attribute, "_dbus_is_property", False):
1016
 
                    # Create a new, but exactly alike, function
1017
 
                    # object, and decorate it to be a new D-Bus
1018
 
                    # property with the alternate D-Bus interface
1019
 
                    # name.  Add it to the class.
1020
 
                    attr[attrname] = (dbus_service_property
1021
 
                                      (alt_interface,
1022
 
                                       attribute._dbus_signature,
1023
 
                                       attribute._dbus_access,
1024
 
                                       attribute
1025
 
                                       ._dbus_get_args_options
1026
 
                                       ["byte_arrays"])
1027
 
                                      (types.FunctionType
1028
 
                                       (attribute.func_code,
1029
 
                                        attribute.func_globals,
1030
 
                                        attribute.func_name,
1031
 
                                        attribute.func_defaults,
1032
 
                                        attribute.func_closure)))
1033
 
        return type.__new__(mcs, name, bases, attr)
1034
 
 
1035
 
 
1036
 
class ClientDBus(Client, DBusObjectWithProperties):
1037
 
    """A Client class using D-Bus
1038
 
    
1039
 
    Attributes:
1040
 
    dbus_object_path: dbus.ObjectPath
1041
 
    bus: dbus.SystemBus()
1042
 
    """
1043
 
    
1044
 
    runtime_expansions = (Client.runtime_expansions
1045
 
                          + ("dbus_object_path",))
1046
 
    
1047
 
    # dbus.service.Object doesn't use super(), so we can't either.
1048
 
    
1049
 
    def __init__(self, bus = None, *args, **kwargs):
1050
 
        self.bus = bus
1051
 
        Client.__init__(self, *args, **kwargs)
1052
 
        # Only now, when this client is initialized, can it show up on
1053
 
        # the D-Bus
1054
 
        client_object_name = unicode(self.name).translate(
1055
 
            {ord("."): ord("_"),
1056
 
             ord("-"): ord("_")})
1057
 
        self.dbus_object_path = (dbus.ObjectPath
1058
 
                                 ("/clients/" + client_object_name))
1059
 
        DBusObjectWithProperties.__init__(self, self.bus,
1060
 
                                          self.dbus_object_path)
1061
 
        
1062
 
    def notifychangeproperty(transform_func,
1063
 
                             dbus_name, type_func=lambda x: x,
1064
 
                             variant_level=1):
1065
 
        """ Modify a variable so that it's a property which announces
1066
 
        its changes to DBus.
1067
 
        
1068
 
        transform_fun: Function that takes a value and a variant_level
1069
 
                       and transforms it to a D-Bus type.
1070
 
        dbus_name: D-Bus name of the variable
1071
 
        type_func: Function that transform the value before sending it
1072
 
                   to the D-Bus.  Default: no transform
1073
 
        variant_level: D-Bus variant level.  Default: 1
1074
 
        """
1075
 
        attrname = "_{0}".format(dbus_name)
1076
 
        def setter(self, value):
1077
 
            if hasattr(self, "dbus_object_path"):
1078
 
                if (not hasattr(self, attrname) or
1079
 
                    type_func(getattr(self, attrname, None))
1080
 
                    != type_func(value)):
1081
 
                    dbus_value = transform_func(type_func(value),
1082
 
                                                variant_level
1083
 
                                                =variant_level)
1084
 
                    self.PropertyChanged(dbus.String(dbus_name),
1085
 
                                         dbus_value)
1086
 
            setattr(self, attrname, value)
1087
 
        
1088
 
        return property(lambda self: getattr(self, attrname), setter)
1089
 
    
1090
 
    
1091
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1092
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1093
 
                                             "ApprovalPending",
1094
 
                                             type_func = bool)
1095
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1096
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1097
 
                                        "LastEnabled")
1098
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1099
 
                                   type_func = lambda checker:
1100
 
                                       checker is not None)
1101
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1102
 
                                           "LastCheckedOK")
1103
 
    last_approval_request = notifychangeproperty(
1104
 
        datetime_to_dbus, "LastApprovalRequest")
1105
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1106
 
                                               "ApprovedByDefault")
1107
 
    approval_delay = notifychangeproperty(dbus.UInt64,
1108
 
                                          "ApprovalDelay",
1109
 
                                          type_func =
1110
 
                                          timedelta_to_milliseconds)
1111
 
    approval_duration = notifychangeproperty(
1112
 
        dbus.UInt64, "ApprovalDuration",
1113
 
        type_func = timedelta_to_milliseconds)
1114
 
    host = notifychangeproperty(dbus.String, "Host")
1115
 
    timeout = notifychangeproperty(dbus.UInt64, "Timeout",
1116
 
                                   type_func =
1117
 
                                   timedelta_to_milliseconds)
1118
 
    extended_timeout = notifychangeproperty(
1119
 
        dbus.UInt64, "ExtendedTimeout",
1120
 
        type_func = timedelta_to_milliseconds)
1121
 
    interval = notifychangeproperty(dbus.UInt64,
1122
 
                                    "Interval",
1123
 
                                    type_func =
1124
 
                                    timedelta_to_milliseconds)
1125
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1126
 
    
1127
 
    del notifychangeproperty
1128
 
    
1129
 
    def __del__(self, *args, **kwargs):
1130
 
        try:
1131
 
            self.remove_from_connection()
1132
 
        except LookupError:
1133
 
            pass
1134
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1135
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1136
 
        Client.__del__(self, *args, **kwargs)
1137
 
    
1138
 
    def checker_callback(self, pid, condition, command,
1139
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
1140
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)
1141
247
        self.checker = None
1142
 
        if os.WIFEXITED(condition):
1143
 
            exitstatus = os.WEXITSTATUS(condition)
1144
 
            # Emit D-Bus signal
1145
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1146
 
                                  dbus.Int64(condition),
1147
 
                                  dbus.String(command))
1148
 
        else:
1149
 
            # Emit D-Bus signal
1150
 
            self.CheckerCompleted(dbus.Int16(-1),
1151
 
                                  dbus.Int64(condition),
1152
 
                                  dbus.String(command))
1153
 
        
1154
 
        return Client.checker_callback(self, pid, condition, command,
1155
 
                                       *args, **kwargs)
1156
 
    
1157
 
    def start_checker(self, *args, **kwargs):
1158
 
        old_checker = self.checker
1159
 
        if self.checker is not None:
1160
 
            old_checker_pid = self.checker.pid
1161
 
        else:
1162
 
            old_checker_pid = None
1163
 
        r = Client.start_checker(self, *args, **kwargs)
1164
 
        # Only if new checker process was started
1165
 
        if (self.checker is not None
1166
 
            and old_checker_pid != self.checker.pid):
1167
 
            # Emit D-Bus signal
1168
 
            self.CheckerStarted(self.current_checker_command)
1169
 
        return r
1170
 
    
1171
 
    def _reset_approved(self):
1172
 
        self.approved = None
1173
 
        return False
1174
 
    
1175
 
    def approve(self, value=True):
1176
 
        self.send_changedstate()
1177
 
        self.approved = value
1178
 
        gobject.timeout_add(timedelta_to_milliseconds
1179
 
                            (self.approval_duration),
1180
 
                            self._reset_approved)
1181
 
    
1182
 
    
1183
 
    ## D-Bus methods, signals & properties
1184
 
    _interface = "se.recompile.Mandos.Client"
1185
 
    
1186
 
    ## Signals
1187
 
    
1188
 
    # CheckerCompleted - signal
1189
 
    @dbus.service.signal(_interface, signature="nxs")
1190
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1191
 
        "D-Bus signal"
1192
 
        pass
1193
 
    
1194
 
    # CheckerStarted - signal
1195
 
    @dbus.service.signal(_interface, signature="s")
1196
 
    def CheckerStarted(self, command):
1197
 
        "D-Bus signal"
1198
 
        pass
1199
 
    
1200
 
    # PropertyChanged - signal
1201
 
    @dbus.service.signal(_interface, signature="sv")
1202
 
    def PropertyChanged(self, property, value):
1203
 
        "D-Bus signal"
1204
 
        pass
1205
 
    
1206
 
    # GotSecret - signal
1207
 
    @dbus.service.signal(_interface)
1208
 
    def GotSecret(self):
1209
 
        """D-Bus signal
1210
 
        Is sent after a successful transfer of secret from the Mandos
1211
 
        server to mandos-client
1212
 
        """
1213
 
        pass
1214
 
    
1215
 
    # Rejected - signal
1216
 
    @dbus.service.signal(_interface, signature="s")
1217
 
    def Rejected(self, reason):
1218
 
        "D-Bus signal"
1219
 
        pass
1220
 
    
1221
 
    # NeedApproval - signal
1222
 
    @dbus.service.signal(_interface, signature="tb")
1223
 
    def NeedApproval(self, timeout, default):
1224
 
        "D-Bus signal"
1225
 
        return self.need_approval()
1226
 
    
1227
 
    ## Methods
1228
 
    
1229
 
    # Approve - method
1230
 
    @dbus.service.method(_interface, in_signature="b")
1231
 
    def Approve(self, value):
1232
 
        self.approve(value)
1233
 
    
1234
 
    # CheckedOK - method
1235
 
    @dbus.service.method(_interface)
1236
 
    def CheckedOK(self):
1237
 
        self.checked_ok()
1238
 
    
1239
 
    # Enable - method
1240
 
    @dbus.service.method(_interface)
1241
 
    def Enable(self):
1242
 
        "D-Bus method"
1243
 
        self.enable()
1244
 
    
1245
 
    # StartChecker - method
1246
 
    @dbus.service.method(_interface)
1247
 
    def StartChecker(self):
1248
 
        "D-Bus method"
1249
 
        self.start_checker()
1250
 
    
1251
 
    # Disable - method
1252
 
    @dbus.service.method(_interface)
1253
 
    def Disable(self):
1254
 
        "D-Bus method"
1255
 
        self.disable()
1256
 
    
1257
 
    # StopChecker - method
1258
 
    @dbus.service.method(_interface)
1259
 
    def StopChecker(self):
1260
 
        self.stop_checker()
1261
 
    
1262
 
    ## Properties
1263
 
    
1264
 
    # ApprovalPending - property
1265
 
    @dbus_service_property(_interface, signature="b", access="read")
1266
 
    def ApprovalPending_dbus_property(self):
1267
 
        return dbus.Boolean(bool(self.approvals_pending))
1268
 
    
1269
 
    # ApprovedByDefault - property
1270
 
    @dbus_service_property(_interface, signature="b",
1271
 
                           access="readwrite")
1272
 
    def ApprovedByDefault_dbus_property(self, value=None):
1273
 
        if value is None:       # get
1274
 
            return dbus.Boolean(self.approved_by_default)
1275
 
        self.approved_by_default = bool(value)
1276
 
    
1277
 
    # ApprovalDelay - property
1278
 
    @dbus_service_property(_interface, signature="t",
1279
 
                           access="readwrite")
1280
 
    def ApprovalDelay_dbus_property(self, value=None):
1281
 
        if value is None:       # get
1282
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1283
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1284
 
    
1285
 
    # ApprovalDuration - property
1286
 
    @dbus_service_property(_interface, signature="t",
1287
 
                           access="readwrite")
1288
 
    def ApprovalDuration_dbus_property(self, value=None):
1289
 
        if value is None:       # get
1290
 
            return dbus.UInt64(timedelta_to_milliseconds(
1291
 
                    self.approval_duration))
1292
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1293
 
    
1294
 
    # Name - property
1295
 
    @dbus_service_property(_interface, signature="s", access="read")
1296
 
    def Name_dbus_property(self):
1297
 
        return dbus.String(self.name)
1298
 
    
1299
 
    # Fingerprint - property
1300
 
    @dbus_service_property(_interface, signature="s", access="read")
1301
 
    def Fingerprint_dbus_property(self):
1302
 
        return dbus.String(self.fingerprint)
1303
 
    
1304
 
    # Host - property
1305
 
    @dbus_service_property(_interface, signature="s",
1306
 
                           access="readwrite")
1307
 
    def Host_dbus_property(self, value=None):
1308
 
        if value is None:       # get
1309
 
            return dbus.String(self.host)
1310
 
        self.host = unicode(value)
1311
 
    
1312
 
    # Created - property
1313
 
    @dbus_service_property(_interface, signature="s", access="read")
1314
 
    def Created_dbus_property(self):
1315
 
        return datetime_to_dbus(self.created)
1316
 
    
1317
 
    # LastEnabled - property
1318
 
    @dbus_service_property(_interface, signature="s", access="read")
1319
 
    def LastEnabled_dbus_property(self):
1320
 
        return datetime_to_dbus(self.last_enabled)
1321
 
    
1322
 
    # Enabled - property
1323
 
    @dbus_service_property(_interface, signature="b",
1324
 
                           access="readwrite")
1325
 
    def Enabled_dbus_property(self, value=None):
1326
 
        if value is None:       # get
1327
 
            return dbus.Boolean(self.enabled)
1328
 
        if value:
1329
 
            self.enable()
1330
 
        else:
1331
 
            self.disable()
1332
 
    
1333
 
    # LastCheckedOK - property
1334
 
    @dbus_service_property(_interface, signature="s",
1335
 
                           access="readwrite")
1336
 
    def LastCheckedOK_dbus_property(self, value=None):
1337
 
        if value is not None:
1338
 
            self.checked_ok()
1339
 
            return
1340
 
        return datetime_to_dbus(self.last_checked_ok)
1341
 
    
1342
 
    # Expires - property
1343
 
    @dbus_service_property(_interface, signature="s", access="read")
1344
 
    def Expires_dbus_property(self):
1345
 
        return datetime_to_dbus(self.expires)
1346
 
    
1347
 
    # LastApprovalRequest - property
1348
 
    @dbus_service_property(_interface, signature="s", access="read")
1349
 
    def LastApprovalRequest_dbus_property(self):
1350
 
        return datetime_to_dbus(self.last_approval_request)
1351
 
    
1352
 
    # Timeout - property
1353
 
    @dbus_service_property(_interface, signature="t",
1354
 
                           access="readwrite")
1355
 
    def Timeout_dbus_property(self, value=None):
1356
 
        if value is None:       # get
1357
 
            return dbus.UInt64(self.timeout_milliseconds())
1358
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1359
 
        # Reschedule timeout
1360
 
        if self.enabled:
1361
 
            now = datetime.datetime.utcnow()
1362
 
            time_to_die = timedelta_to_milliseconds(
1363
 
                (self.last_checked_ok + self.timeout) - now)
1364
 
            if time_to_die <= 0:
1365
 
                # The timeout has passed
1366
 
                self.disable()
1367
 
            else:
1368
 
                self.expires = (now +
1369
 
                                datetime.timedelta(milliseconds =
1370
 
                                                   time_to_die))
1371
 
                if (getattr(self, "disable_initiator_tag", None)
1372
 
                    is None):
1373
 
                    return
1374
 
                gobject.source_remove(self.disable_initiator_tag)
1375
 
                self.disable_initiator_tag = (gobject.timeout_add
1376
 
                                              (time_to_die,
1377
 
                                               self.disable))
1378
 
    
1379
 
    # ExtendedTimeout - property
1380
 
    @dbus_service_property(_interface, signature="t",
1381
 
                           access="readwrite")
1382
 
    def ExtendedTimeout_dbus_property(self, value=None):
1383
 
        if value is None:       # get
1384
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1385
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1386
 
    
1387
 
    # Interval - property
1388
 
    @dbus_service_property(_interface, signature="t",
1389
 
                           access="readwrite")
1390
 
    def Interval_dbus_property(self, value=None):
1391
 
        if value is None:       # get
1392
 
            return dbus.UInt64(self.interval_milliseconds())
1393
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1394
 
        if getattr(self, "checker_initiator_tag", None) is None:
1395
 
            return
1396
 
        if self.enabled:
1397
 
            # Reschedule checker run
1398
 
            gobject.source_remove(self.checker_initiator_tag)
1399
 
            self.checker_initiator_tag = (gobject.timeout_add
1400
 
                                          (value, self.start_checker))
1401
 
            self.start_checker()    # Start one now, too
1402
 
    
1403
 
    # Checker - property
1404
 
    @dbus_service_property(_interface, signature="s",
1405
 
                           access="readwrite")
1406
 
    def Checker_dbus_property(self, value=None):
1407
 
        if value is None:       # get
1408
 
            return dbus.String(self.checker_command)
1409
 
        self.checker_command = unicode(value)
1410
 
    
1411
 
    # CheckerRunning - property
1412
 
    @dbus_service_property(_interface, signature="b",
1413
 
                           access="readwrite")
1414
 
    def CheckerRunning_dbus_property(self, value=None):
1415
 
        if value is None:       # get
1416
 
            return dbus.Boolean(self.checker is not None)
1417
 
        if value:
1418
 
            self.start_checker()
1419
 
        else:
1420
 
            self.stop_checker()
1421
 
    
1422
 
    # ObjectPath - property
1423
 
    @dbus_service_property(_interface, signature="o", access="read")
1424
 
    def ObjectPath_dbus_property(self):
1425
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1426
 
    
1427
 
    # Secret = property
1428
 
    @dbus_service_property(_interface, signature="ay",
1429
 
                           access="write", byte_arrays=True)
1430
 
    def Secret_dbus_property(self, value):
1431
 
        self.secret = str(value)
1432
 
    
1433
 
    del _interface
1434
 
 
1435
 
 
1436
 
class ProxyClient(object):
1437
 
    def __init__(self, child_pipe, fpr, address):
1438
 
        self._pipe = child_pipe
1439
 
        self._pipe.send(('init', fpr, address))
1440
 
        if not self._pipe.recv():
1441
 
            raise KeyError()
1442
 
    
1443
 
    def __getattribute__(self, name):
1444
 
        if name == '_pipe':
1445
 
            return super(ProxyClient, self).__getattribute__(name)
1446
 
        self._pipe.send(('getattr', name))
1447
 
        data = self._pipe.recv()
1448
 
        if data[0] == 'data':
1449
 
            return data[1]
1450
 
        if data[0] == 'function':
1451
 
            def func(*args, **kwargs):
1452
 
                self._pipe.send(('funcall', name, args, kwargs))
1453
 
                return self._pipe.recv()[1]
1454
 
            return func
1455
 
    
1456
 
    def __setattr__(self, name, value):
1457
 
        if name == '_pipe':
1458
 
            return super(ProxyClient, self).__setattr__(name, value)
1459
 
        self._pipe.send(('setattr', name, value))
1460
 
 
1461
 
 
1462
 
class ClientDBusTransitional(ClientDBus):
1463
 
    __metaclass__ = AlternateDBusNamesMetaclass
1464
 
 
1465
 
 
1466
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1467
 
    """A class to handle client connections.
1468
 
    
1469
 
    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.
1470
307
    Note: This will run in its own forked process."""
1471
308
    
1472
309
    def handle(self):
1473
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1474
 
            logger.info("TCP connection from: %s",
1475
 
                        unicode(self.client_address))
1476
 
            logger.debug("Pipe FD: %d",
1477
 
                         self.server.child_pipe.fileno())
1478
 
            
1479
 
            session = (gnutls.connection
1480
 
                       .ClientSession(self.request,
1481
 
                                      gnutls.connection
1482
 
                                      .X509Credentials()))
1483
 
            
1484
 
            # Note: gnutls.connection.X509Credentials is really a
1485
 
            # generic GnuTLS certificate credentials object so long as
1486
 
            # no X.509 keys are added to it.  Therefore, we can use it
1487
 
            # here despite using OpenPGP certificates.
1488
 
            
1489
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1490
 
            #                      "+AES-256-CBC", "+SHA1",
1491
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1492
 
            #                      "+DHE-DSS"))
1493
 
            # Use a fallback default, since this MUST be set.
1494
 
            priority = self.server.gnutls_priority
1495
 
            if priority is None:
1496
 
                priority = "NORMAL"
1497
 
            (gnutls.library.functions
1498
 
             .gnutls_priority_set_direct(session._c_object,
1499
 
                                         priority, None))
1500
 
            
1501
 
            # Start communication using the Mandos protocol
1502
 
            # Get protocol number
1503
 
            line = self.request.makefile().readline()
1504
 
            logger.debug("Protocol version: %r", line)
1505
 
            try:
1506
 
                if int(line.strip().split()[0]) > 1:
1507
 
                    raise RuntimeError
1508
 
            except (ValueError, IndexError, RuntimeError) as error:
1509
 
                logger.error("Unknown protocol version: %s", error)
1510
 
                return
1511
 
            
1512
 
            # Start GnuTLS connection
1513
 
            try:
1514
 
                session.handshake()
1515
 
            except gnutls.errors.GNUTLSError as error:
1516
 
                logger.warning("Handshake failed: %s", error)
1517
 
                # Do not run session.bye() here: the session is not
1518
 
                # established.  Just abandon the request.
1519
 
                return
1520
 
            logger.debug("Handshake succeeded")
1521
 
            
1522
 
            approval_required = False
1523
 
            try:
1524
 
                try:
1525
 
                    fpr = self.fingerprint(self.peer_certificate
1526
 
                                           (session))
1527
 
                except (TypeError,
1528
 
                        gnutls.errors.GNUTLSError) as error:
1529
 
                    logger.warning("Bad certificate: %s", error)
1530
 
                    return
1531
 
                logger.debug("Fingerprint: %s", fpr)
1532
 
                
1533
 
                try:
1534
 
                    client = ProxyClient(child_pipe, fpr,
1535
 
                                         self.client_address)
1536
 
                except KeyError:
1537
 
                    return
1538
 
                
1539
 
                if client.approval_delay:
1540
 
                    delay = client.approval_delay
1541
 
                    client.approvals_pending += 1
1542
 
                    approval_required = True
1543
 
                
1544
 
                while True:
1545
 
                    if not client.enabled:
1546
 
                        logger.info("Client %s is disabled",
1547
 
                                       client.name)
1548
 
                        if self.server.use_dbus:
1549
 
                            # Emit D-Bus signal
1550
 
                            client.Rejected("Disabled")
1551
 
                        return
1552
 
                    
1553
 
                    if client.approved or not client.approval_delay:
1554
 
                        #We are approved or approval is disabled
1555
 
                        break
1556
 
                    elif client.approved is None:
1557
 
                        logger.info("Client %s needs approval",
1558
 
                                    client.name)
1559
 
                        if self.server.use_dbus:
1560
 
                            # Emit D-Bus signal
1561
 
                            client.NeedApproval(
1562
 
                                client.approval_delay_milliseconds(),
1563
 
                                client.approved_by_default)
1564
 
                    else:
1565
 
                        logger.warning("Client %s was not approved",
1566
 
                                       client.name)
1567
 
                        if self.server.use_dbus:
1568
 
                            # Emit D-Bus signal
1569
 
                            client.Rejected("Denied")
1570
 
                        return
1571
 
                    
1572
 
                    #wait until timeout or approved
1573
 
                    time = datetime.datetime.now()
1574
 
                    client.changedstate.acquire()
1575
 
                    (client.changedstate.wait
1576
 
                     (float(client.timedelta_to_milliseconds(delay)
1577
 
                            / 1000)))
1578
 
                    client.changedstate.release()
1579
 
                    time2 = datetime.datetime.now()
1580
 
                    if (time2 - time) >= delay:
1581
 
                        if not client.approved_by_default:
1582
 
                            logger.warning("Client %s timed out while"
1583
 
                                           " waiting for approval",
1584
 
                                           client.name)
1585
 
                            if self.server.use_dbus:
1586
 
                                # Emit D-Bus signal
1587
 
                                client.Rejected("Approval timed out")
1588
 
                            return
1589
 
                        else:
1590
 
                            break
1591
 
                    else:
1592
 
                        delay -= time2 - time
1593
 
                
1594
 
                sent_size = 0
1595
 
                while sent_size < len(client.secret):
1596
 
                    try:
1597
 
                        sent = session.send(client.secret[sent_size:])
1598
 
                    except gnutls.errors.GNUTLSError as error:
1599
 
                        logger.warning("gnutls send failed")
1600
 
                        return
1601
 
                    logger.debug("Sent: %d, remaining: %d",
1602
 
                                 sent, len(client.secret)
1603
 
                                 - (sent_size + sent))
1604
 
                    sent_size += sent
1605
 
                
1606
 
                logger.info("Sending secret to %s", client.name)
1607
 
                # bump the timeout using extended_timeout
1608
 
                client.checked_ok(client.extended_timeout)
1609
 
                if self.server.use_dbus:
1610
 
                    # Emit D-Bus signal
1611
 
                    client.GotSecret()
1612
 
            
1613
 
            finally:
1614
 
                if approval_required:
1615
 
                    client.approvals_pending -= 1
1616
 
                try:
1617
 
                    session.bye()
1618
 
                except gnutls.errors.GNUTLSError as error:
1619
 
                    logger.warning("GnuTLS bye failed")
1620
 
    
1621
 
    @staticmethod
1622
 
    def peer_certificate(session):
1623
 
        "Return the peer's OpenPGP certificate as a bytestring"
1624
 
        # If not an OpenPGP certificate...
1625
 
        if (gnutls.library.functions
1626
 
            .gnutls_certificate_type_get(session._c_object)
1627
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1628
 
            # ...do the normal thing
1629
 
            return session.peer_certificate
1630
 
        list_size = ctypes.c_uint(1)
1631
 
        cert_list = (gnutls.library.functions
1632
 
                     .gnutls_certificate_get_peers
1633
 
                     (session._c_object, ctypes.byref(list_size)))
1634
 
        if not bool(cert_list) and list_size.value != 0:
1635
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1636
 
                                            " certificate")
1637
 
        if list_size.value == 0:
1638
 
            return None
1639
 
        cert = cert_list[0]
1640
 
        return ctypes.string_at(cert.data, cert.size)
1641
 
    
1642
 
    @staticmethod
1643
 
    def fingerprint(openpgp):
1644
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1645
 
        # New GnuTLS "datum" with the OpenPGP public key
1646
 
        datum = (gnutls.library.types
1647
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1648
 
                                             ctypes.POINTER
1649
 
                                             (ctypes.c_ubyte)),
1650
 
                                 ctypes.c_uint(len(openpgp))))
1651
 
        # New empty GnuTLS certificate
1652
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1653
 
        (gnutls.library.functions
1654
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1655
 
        # Import the OpenPGP public key into the certificate
1656
 
        (gnutls.library.functions
1657
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1658
 
                                    gnutls.library.constants
1659
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1660
 
        # Verify the self signature in the key
1661
 
        crtverify = ctypes.c_uint()
1662
 
        (gnutls.library.functions
1663
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1664
 
                                         ctypes.byref(crtverify)))
1665
 
        if crtverify.value != 0:
1666
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1667
 
            raise (gnutls.errors.CertificateSecurityError
1668
 
                   ("Verify failed"))
1669
 
        # New buffer for the fingerprint
1670
 
        buf = ctypes.create_string_buffer(20)
1671
 
        buf_len = ctypes.c_size_t()
1672
 
        # Get the fingerprint from the certificate into the buffer
1673
 
        (gnutls.library.functions
1674
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1675
 
                                             ctypes.byref(buf_len)))
1676
 
        # Deinit the certificate
1677
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1678
 
        # Convert the buffer to a Python bytestring
1679
 
        fpr = ctypes.string_at(buf, buf_len.value)
1680
 
        # Convert the bytestring to hexadecimal notation
1681
 
        hex_fpr = binascii.hexlify(fpr).upper()
1682
 
        return hex_fpr
1683
 
 
1684
 
 
1685
 
class MultiprocessingMixIn(object):
1686
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1687
 
    def sub_process_main(self, request, address):
1688
 
        try:
1689
 
            self.finish_request(request, address)
1690
 
        except Exception:
1691
 
            self.handle_error(request, address)
1692
 
        self.close_request(request)
1693
 
    
1694
 
    def process_request(self, request, address):
1695
 
        """Start a new process to process the request."""
1696
 
        proc = multiprocessing.Process(target = self.sub_process_main,
1697
 
                                       args = (request,
1698
 
                                               address))
1699
 
        proc.start()
1700
 
        return proc
1701
 
 
1702
 
 
1703
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1704
 
    """ adds a pipe to the MixIn """
1705
 
    def process_request(self, request, client_address):
1706
 
        """Overrides and wraps the original process_request().
1707
 
        
1708
 
        This function creates a new pipe in self.pipe
1709
 
        """
1710
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1711
 
        
1712
 
        proc = MultiprocessingMixIn.process_request(self, request,
1713
 
                                                    client_address)
1714
 
        self.child_pipe.close()
1715
 
        self.add_pipe(parent_pipe, proc)
1716
 
    
1717
 
    def add_pipe(self, parent_pipe, proc):
1718
 
        """Dummy function; override as necessary"""
1719
 
        raise NotImplementedError
1720
 
 
1721
 
 
1722
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1723
 
                     socketserver.TCPServer, object):
1724
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1725
 
    
 
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.
1726
367
    Attributes:
1727
 
        enabled:        Boolean; whether this server is activated yet
1728
 
        interface:      None or a network interface name (string)
1729
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1730
370
    """
1731
 
    def __init__(self, server_address, RequestHandlerClass,
1732
 
                 interface=None, use_ipv6=True):
1733
 
        self.interface = interface
1734
 
        if use_ipv6:
1735
 
            self.address_family = socket.AF_INET6
1736
 
        socketserver.TCPServer.__init__(self, server_address,
1737
 
                                        RequestHandlerClass)
 
371
    address_family = socket.AF_INET6
 
372
    def __init__(self, *args, **kwargs):
 
373
        if "options" in kwargs:
 
374
            self.options = kwargs["options"]
 
375
            del kwargs["options"]
 
376
        if "clients" in kwargs:
 
377
            self.clients = kwargs["clients"]
 
378
            del kwargs["clients"]
 
379
        return super(type(self), self).__init__(*args, **kwargs)
1738
380
    def server_bind(self):
1739
381
        """This overrides the normal server_bind() function
1740
382
        to bind to an interface if one was specified, and also NOT to
1741
383
        bind to an address or port if they were not specified."""
1742
 
        if self.interface is not None:
1743
 
            if SO_BINDTODEVICE is None:
1744
 
                logger.error("SO_BINDTODEVICE does not exist;"
1745
 
                             " cannot bind to interface %s",
1746
 
                             self.interface)
1747
 
            else:
1748
 
                try:
1749
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1750
 
                                           SO_BINDTODEVICE,
1751
 
                                           str(self.interface
1752
 
                                               + '\0'))
1753
 
                except socket.error as error:
1754
 
                    if error[0] == errno.EPERM:
1755
 
                        logger.error("No permission to"
1756
 
                                     " bind to interface %s",
1757
 
                                     self.interface)
1758
 
                    elif error[0] == errno.ENOPROTOOPT:
1759
 
                        logger.error("SO_BINDTODEVICE not available;"
1760
 
                                     " cannot bind to interface %s",
1761
 
                                     self.interface)
1762
 
                    else:
1763
 
                        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
1764
399
        # Only bind(2) the socket if we really need to.
1765
400
        if self.server_address[0] or self.server_address[1]:
1766
401
            if not self.server_address[0]:
1767
 
                if self.address_family == socket.AF_INET6:
1768
 
                    any_address = "::" # in6addr_any
1769
 
                else:
1770
 
                    any_address = socket.INADDR_ANY
1771
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1772
404
                                       self.server_address[1])
1773
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1774
406
                self.server_address = (self.server_address[0],
1775
407
                                       0)
1776
 
#                 if self.interface:
1777
 
#                     self.server_address = (self.server_address[0],
1778
 
#                                            0, # port
1779
 
#                                            0, # flowinfo
1780
 
#                                            if_nametoindex
1781
 
#                                            (self.interface))
1782
 
            return socketserver.TCPServer.server_bind(self)
1783
 
 
1784
 
 
1785
 
class MandosServer(IPv6_TCPServer):
1786
 
    """Mandos server.
1787
 
    
1788
 
    Attributes:
1789
 
        clients:        set of Client objects
1790
 
        gnutls_priority GnuTLS priority string
1791
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1792
 
    
1793
 
    Assumes a gobject.MainLoop event loop.
1794
 
    """
1795
 
    def __init__(self, server_address, RequestHandlerClass,
1796
 
                 interface=None, use_ipv6=True, clients=None,
1797
 
                 gnutls_priority=None, use_dbus=True):
1798
 
        self.enabled = False
1799
 
        self.clients = clients
1800
 
        if self.clients is None:
1801
 
            self.clients = {}
1802
 
        self.use_dbus = use_dbus
1803
 
        self.gnutls_priority = gnutls_priority
1804
 
        IPv6_TCPServer.__init__(self, server_address,
1805
 
                                RequestHandlerClass,
1806
 
                                interface = interface,
1807
 
                                use_ipv6 = use_ipv6)
1808
 
    def server_activate(self):
1809
 
        if self.enabled:
1810
 
            return socketserver.TCPServer.server_activate(self)
1811
 
    
1812
 
    def enable(self):
1813
 
        self.enabled = True
1814
 
    
1815
 
    def add_pipe(self, parent_pipe, proc):
1816
 
        # Call "handle_ipc" for both data and EOF events
1817
 
        gobject.io_add_watch(parent_pipe.fileno(),
1818
 
                             gobject.IO_IN | gobject.IO_HUP,
1819
 
                             functools.partial(self.handle_ipc,
1820
 
                                               parent_pipe =
1821
 
                                               parent_pipe,
1822
 
                                               proc = proc))
1823
 
    
1824
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1825
 
                   proc = None, client_object=None):
1826
 
        condition_names = {
1827
 
            gobject.IO_IN: "IN",   # There is data to read.
1828
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1829
 
                                    # blocking).
1830
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1831
 
            gobject.IO_ERR: "ERR", # Error condition.
1832
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1833
 
                                    # broken, usually for pipes and
1834
 
                                    # sockets).
1835
 
            }
1836
 
        conditions_string = ' | '.join(name
1837
 
                                       for cond, name in
1838
 
                                       condition_names.iteritems()
1839
 
                                       if cond & condition)
1840
 
        # error, or the other end of multiprocessing.Pipe has closed
1841
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1842
 
            # Wait for other process to exit
1843
 
            proc.join()
1844
 
            return False
1845
 
        
1846
 
        # Read a request from the child
1847
 
        request = parent_pipe.recv()
1848
 
        command = request[0]
1849
 
        
1850
 
        if command == 'init':
1851
 
            fpr = request[1]
1852
 
            address = request[2]
1853
 
            
1854
 
            for c in self.clients.itervalues():
1855
 
                if c.fingerprint == fpr:
1856
 
                    client = c
1857
 
                    break
1858
 
            else:
1859
 
                logger.info("Client not found for fingerprint: %s, ad"
1860
 
                            "dress: %s", fpr, address)
1861
 
                if self.use_dbus:
1862
 
                    # Emit D-Bus signal
1863
 
                    mandos_dbus_service.ClientNotFound(fpr,
1864
 
                                                       address[0])
1865
 
                parent_pipe.send(False)
1866
 
                return False
1867
 
            
1868
 
            gobject.io_add_watch(parent_pipe.fileno(),
1869
 
                                 gobject.IO_IN | gobject.IO_HUP,
1870
 
                                 functools.partial(self.handle_ipc,
1871
 
                                                   parent_pipe =
1872
 
                                                   parent_pipe,
1873
 
                                                   proc = proc,
1874
 
                                                   client_object =
1875
 
                                                   client))
1876
 
            parent_pipe.send(True)
1877
 
            # remove the old hook in favor of the new above hook on
1878
 
            # same fileno
1879
 
            return False
1880
 
        if command == 'funcall':
1881
 
            funcname = request[1]
1882
 
            args = request[2]
1883
 
            kwargs = request[3]
1884
 
            
1885
 
            parent_pipe.send(('data', getattr(client_object,
1886
 
                                              funcname)(*args,
1887
 
                                                         **kwargs)))
1888
 
        
1889
 
        if command == 'getattr':
1890
 
            attrname = request[1]
1891
 
            if callable(client_object.__getattribute__(attrname)):
1892
 
                parent_pipe.send(('function',))
1893
 
            else:
1894
 
                parent_pipe.send(('data', client_object
1895
 
                                  .__getattribute__(attrname)))
1896
 
        
1897
 
        if command == 'setattr':
1898
 
            attrname = request[1]
1899
 
            value = request[2]
1900
 
            setattr(client_object, attrname, value)
1901
 
        
1902
 
        return True
 
408
            return super(type(self), self).server_bind()
1903
409
 
1904
410
 
1905
411
def string_to_delta(interval):
1906
412
    """Parse a string and return a datetime.timedelta
1907
 
    
 
413
 
1908
414
    >>> string_to_delta('7d')
1909
415
    datetime.timedelta(7)
1910
416
    >>> string_to_delta('60s')
1913
419
    datetime.timedelta(0, 3600)
1914
420
    >>> string_to_delta('24h')
1915
421
    datetime.timedelta(1)
1916
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1917
423
    datetime.timedelta(7)
1918
 
    >>> string_to_delta('5m 30s')
1919
 
    datetime.timedelta(0, 330)
1920
424
    """
1921
 
    timevalue = datetime.timedelta(0)
1922
 
    for s in interval.split():
1923
 
        try:
1924
 
            suffix = unicode(s[-1])
1925
 
            value = int(s[:-1])
1926
 
            if suffix == "d":
1927
 
                delta = datetime.timedelta(value)
1928
 
            elif suffix == "s":
1929
 
                delta = datetime.timedelta(0, value)
1930
 
            elif suffix == "m":
1931
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1932
 
            elif suffix == "h":
1933
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1934
 
            elif suffix == "w":
1935
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1936
 
            else:
1937
 
                raise ValueError("Unknown suffix %r" % suffix)
1938
 
        except (ValueError, IndexError) as e:
1939
 
            raise ValueError(*(e.args))
1940
 
        timevalue += delta
1941
 
    return timevalue
1942
 
 
1943
 
 
1944
 
def daemon(nochdir = False, noclose = False):
1945
 
    """See daemon(3).  Standard BSD Unix function.
1946
 
    
1947
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1948
 
    if os.fork():
1949
 
        sys.exit()
1950
 
    os.setsid()
1951
 
    if not nochdir:
1952
 
        os.chdir("/")
1953
 
    if os.fork():
1954
 
        sys.exit()
1955
 
    if not noclose:
1956
 
        # Close all standard open file descriptors
1957
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1958
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1959
 
            raise OSError(errno.ENODEV,
1960
 
                          "%s not a character device"
1961
 
                          % os.path.devnull)
1962
 
        os.dup2(null, sys.stdin.fileno())
1963
 
        os.dup2(null, sys.stdout.fileno())
1964
 
        os.dup2(null, sys.stderr.fileno())
1965
 
        if null > 2:
1966
 
            os.close(null)
1967
 
 
1968
 
 
1969
 
def main():
1970
 
    
1971
 
    ##################################################################
1972
 
    # Parsing of options, both command line and config file
1973
 
    
1974
 
    parser = argparse.ArgumentParser()
1975
 
    parser.add_argument("-v", "--version", action="version",
1976
 
                        version = "%%(prog)s %s" % version,
1977
 
                        help="show version number and exit")
1978
 
    parser.add_argument("-i", "--interface", metavar="IF",
1979
 
                        help="Bind to interface IF")
1980
 
    parser.add_argument("-a", "--address",
1981
 
                        help="Address to listen for requests on")
1982
 
    parser.add_argument("-p", "--port", type=int,
1983
 
                        help="Port number to receive requests on")
1984
 
    parser.add_argument("--check", action="store_true",
1985
 
                        help="Run self-test")
1986
 
    parser.add_argument("--debug", action="store_true",
1987
 
                        help="Debug mode; run in foreground and log"
1988
 
                        " to terminal")
1989
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
1990
 
                        help="Debug level for stdout output")
1991
 
    parser.add_argument("--priority", help="GnuTLS"
1992
 
                        " priority string (see GnuTLS documentation)")
1993
 
    parser.add_argument("--servicename",
1994
 
                        metavar="NAME", help="Zeroconf service name")
1995
 
    parser.add_argument("--configdir",
1996
 
                        default="/etc/mandos", metavar="DIR",
1997
 
                        help="Directory to search for configuration"
1998
 
                        " files")
1999
 
    parser.add_argument("--no-dbus", action="store_false",
2000
 
                        dest="use_dbus", help="Do not provide D-Bus"
2001
 
                        " system bus interface")
2002
 
    parser.add_argument("--no-ipv6", action="store_false",
2003
 
                        dest="use_ipv6", help="Do not use IPv6")
2004
 
    parser.add_argument("--no-restore", action="store_false",
2005
 
                        dest="restore", help="Do not restore stored"
2006
 
                        " state")
2007
 
    parser.add_argument("--statedir", metavar="DIR",
2008
 
                        help="Directory to save/restore state in")
2009
 
    
2010
 
    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()
2011
566
    
2012
567
    if options.check:
2013
568
        import doctest
2014
569
        doctest.testmod()
2015
570
        sys.exit()
2016
571
    
2017
 
    # Default values for config file for server-global settings
2018
 
    server_defaults = { "interface": "",
2019
 
                        "address": "",
2020
 
                        "port": "",
2021
 
                        "debug": "False",
2022
 
                        "priority":
2023
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
2024
 
                        "servicename": "Mandos",
2025
 
                        "use_dbus": "True",
2026
 
                        "use_ipv6": "True",
2027
 
                        "debuglevel": "",
2028
 
                        "restore": "True",
2029
 
                        "statedir": "/var/lib/mandos"
2030
 
                        }
2031
 
    
2032
 
    # Parse config file for server-global settings
2033
 
    server_config = configparser.SafeConfigParser(server_defaults)
2034
 
    del server_defaults
2035
 
    server_config.read(os.path.join(options.configdir,
2036
 
                                    "mandos.conf"))
2037
 
    # Convert the SafeConfigParser object to a dict
2038
 
    server_settings = server_config.defaults()
2039
 
    # Use the appropriate methods on the non-string config options
2040
 
    for option in ("debug", "use_dbus", "use_ipv6"):
2041
 
        server_settings[option] = server_config.getboolean("DEFAULT",
2042
 
                                                           option)
2043
 
    if server_settings["port"]:
2044
 
        server_settings["port"] = server_config.getint("DEFAULT",
2045
 
                                                       "port")
2046
 
    del server_config
2047
 
    
2048
 
    # Override the settings from the config file with command line
2049
 
    # options, if set.
2050
 
    for option in ("interface", "address", "port", "debug",
2051
 
                   "priority", "servicename", "configdir",
2052
 
                   "use_dbus", "use_ipv6", "debuglevel", "restore",
2053
 
                   "statedir"):
2054
 
        value = getattr(options, option)
2055
 
        if value is not None:
2056
 
            server_settings[option] = value
2057
 
    del options
2058
 
    # Force all strings to be unicode
2059
 
    for option in server_settings.keys():
2060
 
        if type(server_settings[option]) is str:
2061
 
            server_settings[option] = unicode(server_settings[option])
2062
 
    # Now we have our good server settings in "server_settings"
2063
 
    
2064
 
    ##################################################################
2065
 
    
2066
 
    # For convenience
2067
 
    debug = server_settings["debug"]
2068
 
    debuglevel = server_settings["debuglevel"]
2069
 
    use_dbus = server_settings["use_dbus"]
2070
 
    use_ipv6 = server_settings["use_ipv6"]
2071
 
    stored_state_path = os.path.join(server_settings["statedir"],
2072
 
                                     stored_state_file)
2073
 
    
2074
 
    if debug:
2075
 
        initlogger(debug, logging.DEBUG)
2076
 
    else:
2077
 
        if not debuglevel:
2078
 
            initlogger(debug)
2079
 
        else:
2080
 
            level = getattr(logging, debuglevel.upper())
2081
 
            initlogger(debug, level)
2082
 
    
2083
 
    if server_settings["servicename"] != "Mandos":
2084
 
        syslogger.setFormatter(logging.Formatter
2085
 
                               ('Mandos (%s) [%%(process)d]:'
2086
 
                                ' %%(levelname)s: %%(message)s'
2087
 
                                % server_settings["servicename"]))
2088
 
    
2089
 
    # Parse config file with clients
2090
 
    client_config = configparser.SafeConfigParser(Client
2091
 
                                                  .client_defaults)
2092
 
    client_config.read(os.path.join(server_settings["configdir"],
2093
 
                                    "clients.conf"))
2094
 
    
2095
 
    global mandos_dbus_service
2096
 
    mandos_dbus_service = None
2097
 
    
2098
 
    tcp_server = MandosServer((server_settings["address"],
2099
 
                               server_settings["port"]),
2100
 
                              ClientHandler,
2101
 
                              interface=(server_settings["interface"]
2102
 
                                         or None),
2103
 
                              use_ipv6=use_ipv6,
2104
 
                              gnutls_priority=
2105
 
                              server_settings["priority"],
2106
 
                              use_dbus=use_dbus)
2107
 
    if not debug:
2108
 
        pidfilename = "/var/run/mandos.pid"
2109
 
        try:
2110
 
            pidfile = open(pidfilename, "w")
2111
 
        except IOError:
2112
 
            logger.error("Could not open file %r", pidfilename)
2113
 
    
2114
 
    try:
2115
 
        uid = pwd.getpwnam("_mandos").pw_uid
2116
 
        gid = pwd.getpwnam("_mandos").pw_gid
2117
 
    except KeyError:
2118
 
        try:
2119
 
            uid = pwd.getpwnam("mandos").pw_uid
2120
 
            gid = pwd.getpwnam("mandos").pw_gid
2121
 
        except KeyError:
2122
 
            try:
2123
 
                uid = pwd.getpwnam("nobody").pw_uid
2124
 
                gid = pwd.getpwnam("nobody").pw_gid
2125
 
            except KeyError:
2126
 
                uid = 65534
2127
 
                gid = 65534
2128
 
    try:
2129
 
        os.setgid(gid)
2130
 
        os.setuid(uid)
2131
 
    except OSError as error:
2132
 
        if error[0] != errno.EPERM:
2133
 
            raise error
2134
 
    
2135
 
    if debug:
2136
 
        # Enable all possible GnuTLS debugging
2137
 
        
2138
 
        # "Use a log level over 10 to enable all debugging options."
2139
 
        # - GnuTLS manual
2140
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
2141
 
        
2142
 
        @gnutls.library.types.gnutls_log_func
2143
 
        def debug_gnutls(level, string):
2144
 
            logger.debug("GnuTLS: %s", string[:-1])
2145
 
        
2146
 
        (gnutls.library.functions
2147
 
         .gnutls_global_set_log_function(debug_gnutls))
2148
 
        
2149
 
        # Redirect stdin so all checkers get /dev/null
2150
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2151
 
        os.dup2(null, sys.stdin.fileno())
2152
 
        if null > 2:
2153
 
            os.close(null)
2154
 
    
2155
 
    # Need to fork before connecting to D-Bus
2156
 
    if not debug:
2157
 
        # Close all input and output, do double fork, etc.
2158
 
        daemon()
2159
 
    
2160
 
    gobject.threads_init()
2161
 
    
2162
 
    global main_loop
2163
 
    # From the Avahi example code
 
572
    # Parse the time arguments
 
573
    try:
 
574
        options.timeout = string_to_delta(options.timeout)
 
575
    except ValueError:
 
576
        parser.error("option --timeout: Unparseable time")
 
577
    try:
 
578
        options.interval = string_to_delta(options.interval)
 
579
    except ValueError:
 
580
        parser.error("option --interval: Unparseable time")
 
581
    
 
582
    # Parse config file
 
583
    defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
 
584
    client_config = ConfigParser.SafeConfigParser(defaults)
 
585
    #client_config.readfp(open("secrets.conf"), "secrets.conf")
 
586
    client_config.read("mandos-clients.conf")
 
587
    
 
588
    # From the Avahi server example code
2164
589
    DBusGMainLoop(set_as_default=True )
2165
590
    main_loop = gobject.MainLoop()
2166
591
    bus = dbus.SystemBus()
2167
 
    # End of Avahi example code
2168
 
    if use_dbus:
2169
 
        try:
2170
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
2171
 
                                            bus, do_not_queue=True)
2172
 
            old_bus_name = (dbus.service.BusName
2173
 
                            ("se.bsnet.fukt.Mandos", bus,
2174
 
                             do_not_queue=True))
2175
 
        except dbus.exceptions.NameExistsException as e:
2176
 
            logger.error(unicode(e) + ", disabling D-Bus")
2177
 
            use_dbus = False
2178
 
            server_settings["use_dbus"] = False
2179
 
            tcp_server.use_dbus = False
2180
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2181
 
    service = AvahiServiceToSyslog(name =
2182
 
                                   server_settings["servicename"],
2183
 
                                   servicetype = "_mandos._tcp",
2184
 
                                   protocol = protocol, bus = bus)
2185
 
    if server_settings["interface"]:
2186
 
        service.interface = (if_nametoindex
2187
 
                             (str(server_settings["interface"])))
2188
 
    
2189
 
    global multiprocessing_manager
2190
 
    multiprocessing_manager = multiprocessing.Manager()
2191
 
    
2192
 
    client_class = Client
2193
 
    if use_dbus:
2194
 
        client_class = functools.partial(ClientDBusTransitional,
2195
 
                                         bus = bus)
2196
 
    
2197
 
    client_settings = Client.config_parser(client_config)
2198
 
    old_client_settings = {}
2199
 
    clients_data = {}
2200
 
    
2201
 
    # Get client data and settings from last running state.
2202
 
    if server_settings["restore"]:
2203
 
        try:
2204
 
            with open(stored_state_path, "rb") as stored_state:
2205
 
                clients_data, old_client_settings = (pickle.load
2206
 
                                                     (stored_state))
2207
 
            os.remove(stored_state_path)
2208
 
        except IOError as e:
2209
 
            logger.warning("Could not load persistent state: {0}"
2210
 
                           .format(e))
2211
 
            if e.errno != errno.ENOENT:
2212
 
                raise
2213
 
        except EOFError as e:
2214
 
            logger.warning("Could not load persistent state: "
2215
 
                           "EOFError: {0}".format(e))
2216
 
    
2217
 
    with PGPEngine() as pgp:
2218
 
        for client_name, client in clients_data.iteritems():
2219
 
            # Decide which value to use after restoring saved state.
2220
 
            # We have three different values: Old config file,
2221
 
            # new config file, and saved state.
2222
 
            # New config value takes precedence if it differs from old
2223
 
            # config value, otherwise use saved state.
2224
 
            for name, value in client_settings[client_name].items():
2225
 
                try:
2226
 
                    # For each value in new config, check if it
2227
 
                    # differs from the old config value (Except for
2228
 
                    # the "secret" attribute)
2229
 
                    if (name != "secret" and
2230
 
                        value != old_client_settings[client_name]
2231
 
                        [name]):
2232
 
                        client[name] = value
2233
 
                except KeyError:
2234
 
                    pass
2235
 
            
2236
 
            # Clients who has passed its expire date can still be
2237
 
            # enabled if its last checker was successful.  Clients
2238
 
            # whose checker succeeded before we stored its state is
2239
 
            # assumed to have successfully run all checkers during
2240
 
            # downtime.
2241
 
            if client["enabled"]:
2242
 
                if datetime.datetime.utcnow() >= client["expires"]:
2243
 
                    if not client["last_checked_ok"]:
2244
 
                        logger.warning(
2245
 
                            "disabling client {0} - Client never "
2246
 
                            "performed a successful checker"
2247
 
                            .format(client_name))
2248
 
                        client["enabled"] = False
2249
 
                    elif client["last_checker_status"] != 0:
2250
 
                        logger.warning(
2251
 
                            "disabling client {0} - Client "
2252
 
                            "last checker failed with error code {1}"
2253
 
                            .format(client_name,
2254
 
                                    client["last_checker_status"]))
2255
 
                        client["enabled"] = False
2256
 
                    else:
2257
 
                        client["expires"] = (datetime.datetime
2258
 
                                             .utcnow()
2259
 
                                             + client["timeout"])
2260
 
                        logger.debug("Last checker succeeded,"
2261
 
                                     " keeping {0} enabled"
2262
 
                                     .format(client_name))
2263
 
            try:
2264
 
                client["secret"] = (
2265
 
                    pgp.decrypt(client["encrypted_secret"],
2266
 
                                client_settings[client_name]
2267
 
                                ["secret"]))
2268
 
            except PGPError:
2269
 
                # If decryption fails, we use secret from new settings
2270
 
                logger.debug("Failed to decrypt {0} old secret"
2271
 
                             .format(client_name))
2272
 
                client["secret"] = (
2273
 
                    client_settings[client_name]["secret"])
2274
 
 
2275
 
    
2276
 
    # Add/remove clients based on new changes made to config
2277
 
    for client_name in (set(old_client_settings)
2278
 
                        - set(client_settings)):
2279
 
        del clients_data[client_name]
2280
 
    for client_name in (set(client_settings)
2281
 
                        - set(old_client_settings)):
2282
 
        clients_data[client_name] = client_settings[client_name]
2283
 
 
2284
 
    # Create all client objects
2285
 
    for client_name, client in clients_data.iteritems():
2286
 
        tcp_server.clients[client_name] = client_class(
2287
 
            name = client_name, settings = client)
2288
 
    
2289
 
    if not tcp_server.clients:
2290
 
        logger.warning("No clients defined")
2291
 
        
2292
 
    if not debug:
2293
 
        try:
2294
 
            with pidfile:
2295
 
                pid = os.getpid()
2296
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2297
 
            del pidfile
2298
 
        except IOError:
2299
 
            logger.error("Could not write to file %r with PID %d",
2300
 
                         pidfilename, pid)
2301
 
        except NameError:
2302
 
            # "pidfile" was never created
2303
 
            pass
2304
 
        del pidfilename
2305
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2306
 
    
2307
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2308
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2309
 
    
2310
 
    if use_dbus:
2311
 
        class MandosDBusService(dbus.service.Object):
2312
 
            """A D-Bus proxy object"""
2313
 
            def __init__(self):
2314
 
                dbus.service.Object.__init__(self, bus, "/")
2315
 
            _interface = "se.recompile.Mandos"
2316
 
            
2317
 
            @dbus.service.signal(_interface, signature="o")
2318
 
            def ClientAdded(self, objpath):
2319
 
                "D-Bus signal"
2320
 
                pass
2321
 
            
2322
 
            @dbus.service.signal(_interface, signature="ss")
2323
 
            def ClientNotFound(self, fingerprint, address):
2324
 
                "D-Bus signal"
2325
 
                pass
2326
 
            
2327
 
            @dbus.service.signal(_interface, signature="os")
2328
 
            def ClientRemoved(self, objpath, name):
2329
 
                "D-Bus signal"
2330
 
                pass
2331
 
            
2332
 
            @dbus.service.method(_interface, out_signature="ao")
2333
 
            def GetAllClients(self):
2334
 
                "D-Bus method"
2335
 
                return dbus.Array(c.dbus_object_path
2336
 
                                  for c in
2337
 
                                  tcp_server.clients.itervalues())
2338
 
            
2339
 
            @dbus.service.method(_interface,
2340
 
                                 out_signature="a{oa{sv}}")
2341
 
            def GetAllClientsWithProperties(self):
2342
 
                "D-Bus method"
2343
 
                return dbus.Dictionary(
2344
 
                    ((c.dbus_object_path, c.GetAll(""))
2345
 
                     for c in tcp_server.clients.itervalues()),
2346
 
                    signature="oa{sv}")
2347
 
            
2348
 
            @dbus.service.method(_interface, in_signature="o")
2349
 
            def RemoveClient(self, object_path):
2350
 
                "D-Bus method"
2351
 
                for c in tcp_server.clients.itervalues():
2352
 
                    if c.dbus_object_path == object_path:
2353
 
                        del tcp_server.clients[c.name]
2354
 
                        c.remove_from_connection()
2355
 
                        # Don't signal anything except ClientRemoved
2356
 
                        c.disable(quiet=True)
2357
 
                        # Emit D-Bus signal
2358
 
                        self.ClientRemoved(object_path, c.name)
2359
 
                        return
2360
 
                raise KeyError(object_path)
2361
 
            
2362
 
            del _interface
2363
 
        
2364
 
        class MandosDBusServiceTransitional(MandosDBusService):
2365
 
            __metaclass__ = AlternateDBusNamesMetaclass
2366
 
        mandos_dbus_service = MandosDBusServiceTransitional()
2367
 
    
2368
 
    def cleanup():
2369
 
        "Cleanup function; run on exit"
2370
 
        service.cleanup()
2371
 
        
2372
 
        multiprocessing.active_children()
2373
 
        if not (tcp_server.clients or client_settings):
2374
 
            return
2375
 
        
2376
 
        # Store client before exiting. Secrets are encrypted with key
2377
 
        # based on what config file has. If config file is
2378
 
        # removed/edited, old secret will thus be unrecovable.
2379
 
        clients = {}
2380
 
        with PGPEngine() as pgp:
2381
 
            for client in tcp_server.clients.itervalues():
2382
 
                key = client_settings[client.name]["secret"]
2383
 
                client.encrypted_secret = pgp.encrypt(client.secret,
2384
 
                                                      key)
2385
 
                client_dict = {}
2386
 
                
2387
 
                # A list of attributes that can not be pickled
2388
 
                # + secret.
2389
 
                exclude = set(("bus", "changedstate", "secret",
2390
 
                               "checker"))
2391
 
                for name, typ in (inspect.getmembers
2392
 
                                  (dbus.service.Object)):
2393
 
                    exclude.add(name)
2394
 
                
2395
 
                client_dict["encrypted_secret"] = (client
2396
 
                                                   .encrypted_secret)
2397
 
                for attr in client.client_structure:
2398
 
                    if attr not in exclude:
2399
 
                        client_dict[attr] = getattr(client, attr)
2400
 
                
2401
 
                clients[client.name] = client_dict
2402
 
                del client_settings[client.name]["secret"]
2403
 
        
2404
 
        try:
2405
 
            tempfd, tempname = tempfile.mkstemp(suffix=".pickle",
2406
 
                                                prefix="clients-",
2407
 
                                                dir=os.path.dirname
2408
 
                                                (stored_state_path))
2409
 
            with os.fdopen(tempfd, "wb") as stored_state:
2410
 
                pickle.dump((clients, client_settings), stored_state)
2411
 
            os.rename(tempname, stored_state_path)
2412
 
        except (IOError, OSError) as e:
2413
 
            logger.warning("Could not save persistent state: {0}"
2414
 
                           .format(e))
2415
 
            if not debug:
2416
 
                try:
2417
 
                    os.remove(tempname)
2418
 
                except NameError:
2419
 
                    pass
2420
 
            if e.errno not in set((errno.ENOENT, errno.EACCES,
2421
 
                                   errno.EEXIST)):
2422
 
                raise e
2423
 
        
2424
 
        # Delete all clients, and settings from config
2425
 
        while tcp_server.clients:
2426
 
            name, client = tcp_server.clients.popitem()
2427
 
            if use_dbus:
2428
 
                client.remove_from_connection()
2429
 
            # Don't signal anything except ClientRemoved
2430
 
            client.disable(quiet=True)
2431
 
            if use_dbus:
2432
 
                # Emit D-Bus signal
2433
 
                mandos_dbus_service.ClientRemoved(client
2434
 
                                                  .dbus_object_path,
2435
 
                                                  client.name)
2436
 
        client_settings.clear()
2437
 
    
2438
 
    atexit.register(cleanup)
2439
 
    
2440
 
    for client in tcp_server.clients.itervalues():
2441
 
        if use_dbus:
2442
 
            # Emit D-Bus signal
2443
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2444
 
        # Need to initiate checking of clients
2445
 
        if client.enabled:
2446
 
            client.init_checker()
2447
 
    
2448
 
    tcp_server.enable()
2449
 
    tcp_server.server_activate()
2450
 
    
2451
 
    # Find out what port we got
2452
 
    service.port = tcp_server.socket.getsockname()[1]
2453
 
    if use_ipv6:
2454
 
        logger.info("Now listening on address %r, port %d,"
2455
 
                    " flowinfo %d, scope_id %d"
2456
 
                    % tcp_server.socket.getsockname())
2457
 
    else:                       # IPv4
2458
 
        logger.info("Now listening on address %r, port %d"
2459
 
                    % tcp_server.socket.getsockname())
2460
 
    
2461
 
    #service.interface = tcp_server.socket.getsockname()[3]
2462
 
    
 
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)
2463
634
    try:
2464
 
        # From the Avahi example code
2465
 
        try:
2466
 
            service.activate()
2467
 
        except dbus.exceptions.DBusException as error:
2468
 
            logger.critical("DBusException: %s", error)
2469
 
            cleanup()
2470
 
            sys.exit(1)
2471
 
        # End of Avahi example code
2472
 
        
2473
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2474
 
                             lambda *args, **kwargs:
2475
 
                             (tcp_server.handle_request
2476
 
                              (*args[2:], **kwargs) or True))
2477
 
        
2478
 
        logger.debug("Starting main loop")
2479
635
        main_loop.run()
2480
 
    except AvahiError as error:
2481
 
        logger.critical("AvahiError: %s", error)
2482
 
        cleanup()
2483
 
        sys.exit(1)
2484
636
    except KeyboardInterrupt:
2485
 
        if debug:
2486
 
            print("", file=sys.stderr)
2487
 
        logger.debug("Server received KeyboardInterrupt")
2488
 
    logger.debug("Server exiting")
2489
 
    # Must run before the D-Bus bus name gets deregistered
2490
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
2491
640
 
2492
 
if __name__ == '__main__':
2493
 
    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()