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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 = "1.4.1"
89
 
stored_state_file = "clients.pickle"
90
 
 
91
 
logger = logging.getLogger()
92
 
syslogger = (logging.handlers.SysLogHandler
93
 
             (facility = logging.handlers.SysLogHandler.LOG_DAEMON,
94
 
              address = str("/dev/log")))
95
 
 
96
 
try:
97
 
    if_nametoindex = (ctypes.cdll.LoadLibrary
98
 
                      (ctypes.util.find_library("c"))
99
 
                      .if_nametoindex)
100
 
except (OSError, AttributeError):
101
 
    def if_nametoindex(interface):
102
 
        "Get an interface index the hard way, i.e. using fcntl()"
103
 
        SIOCGIFINDEX = 0x8933  # From /usr/include/linux/sockios.h
104
 
        with contextlib.closing(socket.socket()) as s:
105
 
            ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
106
 
                                struct.pack(str("16s16x"),
107
 
                                            interface))
108
 
        interface_index = struct.unpack(str("I"),
109
 
                                        ifreq[16:20])[0]
110
 
        return interface_index
111
 
 
112
 
 
113
 
def initlogger(debug, level=logging.WARNING):
114
 
    """init logger and add loglevel"""
115
 
    
116
 
    syslogger.setFormatter(logging.Formatter
117
 
                           ('Mandos [%(process)d]: %(levelname)s:'
118
 
                            ' %(message)s'))
119
 
    logger.addHandler(syslogger)
120
 
    
121
 
    if debug:
122
 
        console = logging.StreamHandler()
123
 
        console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
124
 
                                               ' [%(process)d]:'
125
 
                                               ' %(levelname)s:'
126
 
                                               ' %(message)s'))
127
 
        logger.addHandler(console)
128
 
    logger.setLevel(level)
129
 
 
130
 
 
131
 
class PGPError(Exception):
132
 
    """Exception if encryption/decryption fails"""
133
 
    pass
134
 
 
135
 
 
136
 
class PGPEngine(object):
137
 
    """A simple class for OpenPGP symmetric encryption & decryption"""
138
 
    def __init__(self):
139
 
        self.gnupg = GnuPGInterface.GnuPG()
140
 
        self.tempdir = tempfile.mkdtemp(prefix="mandos-")
141
 
        self.gnupg = GnuPGInterface.GnuPG()
142
 
        self.gnupg.options.meta_interactive = False
143
 
        self.gnupg.options.homedir = self.tempdir
144
 
        self.gnupg.options.extra_args.extend(['--force-mdc',
145
 
                                              '--quiet',
146
 
                                              '--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 password 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(''.join(unichr(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
 
        self._approvals_pending = 0
1053
 
        
1054
 
        self._approvals_pending = 0
1055
 
        # Only now, when this client is initialized, can it show up on
1056
 
        # the D-Bus
1057
 
        client_object_name = unicode(self.name).translate(
1058
 
            {ord("."): ord("_"),
1059
 
             ord("-"): ord("_")})
1060
 
        self.dbus_object_path = (dbus.ObjectPath
1061
 
                                 ("/clients/" + client_object_name))
1062
 
        DBusObjectWithProperties.__init__(self, self.bus,
1063
 
                                          self.dbus_object_path)
1064
 
        
1065
 
    def notifychangeproperty(transform_func,
1066
 
                             dbus_name, type_func=lambda x: x,
1067
 
                             variant_level=1):
1068
 
        """ Modify a variable so that it's a property which announces
1069
 
        its changes to DBus.
1070
 
        
1071
 
        transform_fun: Function that takes a value and a variant_level
1072
 
                       and transforms it to a D-Bus type.
1073
 
        dbus_name: D-Bus name of the variable
1074
 
        type_func: Function that transform the value before sending it
1075
 
                   to the D-Bus.  Default: no transform
1076
 
        variant_level: D-Bus variant level.  Default: 1
1077
 
        """
1078
 
        attrname = "_{0}".format(dbus_name)
1079
 
        def setter(self, value):
1080
 
            if hasattr(self, "dbus_object_path"):
1081
 
                if (not hasattr(self, attrname) or
1082
 
                    type_func(getattr(self, attrname, None))
1083
 
                    != type_func(value)):
1084
 
                    dbus_value = transform_func(type_func(value),
1085
 
                                                variant_level
1086
 
                                                =variant_level)
1087
 
                    self.PropertyChanged(dbus.String(dbus_name),
1088
 
                                         dbus_value)
1089
 
            setattr(self, attrname, value)
1090
 
        
1091
 
        return property(lambda self: getattr(self, attrname), setter)
1092
 
    
1093
 
    
1094
 
    expires = notifychangeproperty(datetime_to_dbus, "Expires")
1095
 
    approvals_pending = notifychangeproperty(dbus.Boolean,
1096
 
                                             "ApprovalPending",
1097
 
                                             type_func = bool)
1098
 
    enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1099
 
    last_enabled = notifychangeproperty(datetime_to_dbus,
1100
 
                                        "LastEnabled")
1101
 
    checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1102
 
                                   type_func = lambda checker:
1103
 
                                       checker is not None)
1104
 
    last_checked_ok = notifychangeproperty(datetime_to_dbus,
1105
 
                                           "LastCheckedOK")
1106
 
    last_approval_request = notifychangeproperty(
1107
 
        datetime_to_dbus, "LastApprovalRequest")
1108
 
    approved_by_default = notifychangeproperty(dbus.Boolean,
1109
 
                                               "ApprovedByDefault")
1110
 
    approval_delay = notifychangeproperty(dbus.UInt64,
1111
 
                                          "ApprovalDelay",
1112
 
                                          type_func =
1113
 
                                          timedelta_to_milliseconds)
1114
 
    approval_duration = notifychangeproperty(
1115
 
        dbus.UInt64, "ApprovalDuration",
1116
 
        type_func = timedelta_to_milliseconds)
1117
 
    host = notifychangeproperty(dbus.String, "Host")
1118
 
    timeout = notifychangeproperty(dbus.UInt64, "Timeout",
1119
 
                                   type_func =
1120
 
                                   timedelta_to_milliseconds)
1121
 
    extended_timeout = notifychangeproperty(
1122
 
        dbus.UInt64, "ExtendedTimeout",
1123
 
        type_func = timedelta_to_milliseconds)
1124
 
    interval = notifychangeproperty(dbus.UInt64,
1125
 
                                    "Interval",
1126
 
                                    type_func =
1127
 
                                    timedelta_to_milliseconds)
1128
 
    checker_command = notifychangeproperty(dbus.String, "Checker")
1129
 
    
1130
 
    del notifychangeproperty
1131
 
    
1132
 
    def __del__(self, *args, **kwargs):
1133
 
        try:
1134
 
            self.remove_from_connection()
1135
 
        except LookupError:
1136
 
            pass
1137
 
        if hasattr(DBusObjectWithProperties, "__del__"):
1138
 
            DBusObjectWithProperties.__del__(self, *args, **kwargs)
1139
 
        Client.__del__(self, *args, **kwargs)
1140
 
    
1141
 
    def checker_callback(self, pid, condition, command,
1142
 
                         *args, **kwargs):
 
242
        gobject.source_remove(self.checker_callback_tag)
1143
243
        self.checker_callback_tag = None
 
244
        os.kill(self.checker.pid, signal.SIGTERM)
 
245
        if self.checker.poll() is None:
 
246
            os.kill(self.checker.pid, signal.SIGKILL)
1144
247
        self.checker = None
1145
 
        if os.WIFEXITED(condition):
1146
 
            exitstatus = os.WEXITSTATUS(condition)
1147
 
            # Emit D-Bus signal
1148
 
            self.CheckerCompleted(dbus.Int16(exitstatus),
1149
 
                                  dbus.Int64(condition),
1150
 
                                  dbus.String(command))
1151
 
        else:
1152
 
            # Emit D-Bus signal
1153
 
            self.CheckerCompleted(dbus.Int16(-1),
1154
 
                                  dbus.Int64(condition),
1155
 
                                  dbus.String(command))
1156
 
        
1157
 
        return Client.checker_callback(self, pid, condition, command,
1158
 
                                       *args, **kwargs)
1159
 
    
1160
 
    def start_checker(self, *args, **kwargs):
1161
 
        old_checker = self.checker
1162
 
        if self.checker is not None:
1163
 
            old_checker_pid = self.checker.pid
1164
 
        else:
1165
 
            old_checker_pid = None
1166
 
        r = Client.start_checker(self, *args, **kwargs)
1167
 
        # Only if new checker process was started
1168
 
        if (self.checker is not None
1169
 
            and old_checker_pid != self.checker.pid):
1170
 
            # Emit D-Bus signal
1171
 
            self.CheckerStarted(self.current_checker_command)
1172
 
        return r
1173
 
    
1174
 
    def _reset_approved(self):
1175
 
        self.approved = None
1176
 
        return False
1177
 
    
1178
 
    def approve(self, value=True):
1179
 
        self.send_changedstate()
1180
 
        self.approved = value
1181
 
        gobject.timeout_add(timedelta_to_milliseconds
1182
 
                            (self.approval_duration),
1183
 
                            self._reset_approved)
1184
 
    
1185
 
    
1186
 
    ## D-Bus methods, signals & properties
1187
 
    _interface = "se.recompile.Mandos.Client"
1188
 
    
1189
 
    ## Signals
1190
 
    
1191
 
    # CheckerCompleted - signal
1192
 
    @dbus.service.signal(_interface, signature="nxs")
1193
 
    def CheckerCompleted(self, exitcode, waitstatus, command):
1194
 
        "D-Bus signal"
1195
 
        pass
1196
 
    
1197
 
    # CheckerStarted - signal
1198
 
    @dbus.service.signal(_interface, signature="s")
1199
 
    def CheckerStarted(self, command):
1200
 
        "D-Bus signal"
1201
 
        pass
1202
 
    
1203
 
    # PropertyChanged - signal
1204
 
    @dbus.service.signal(_interface, signature="sv")
1205
 
    def PropertyChanged(self, property, value):
1206
 
        "D-Bus signal"
1207
 
        pass
1208
 
    
1209
 
    # GotSecret - signal
1210
 
    @dbus.service.signal(_interface)
1211
 
    def GotSecret(self):
1212
 
        """D-Bus signal
1213
 
        Is sent after a successful transfer of secret from the Mandos
1214
 
        server to mandos-client
1215
 
        """
1216
 
        pass
1217
 
    
1218
 
    # Rejected - signal
1219
 
    @dbus.service.signal(_interface, signature="s")
1220
 
    def Rejected(self, reason):
1221
 
        "D-Bus signal"
1222
 
        pass
1223
 
    
1224
 
    # NeedApproval - signal
1225
 
    @dbus.service.signal(_interface, signature="tb")
1226
 
    def NeedApproval(self, timeout, default):
1227
 
        "D-Bus signal"
1228
 
        return self.need_approval()
1229
 
    
1230
 
    # NeRwequest - signal
1231
 
    @dbus.service.signal(_interface, signature="s")
1232
 
    def NewRequest(self, ip):
1233
 
        """D-Bus signal
1234
 
        Is sent after a client request a password.
1235
 
        """
1236
 
        pass
1237
 
    
1238
 
    ## Methods
1239
 
    
1240
 
    # Approve - method
1241
 
    @dbus.service.method(_interface, in_signature="b")
1242
 
    def Approve(self, value):
1243
 
        self.approve(value)
1244
 
    
1245
 
    # CheckedOK - method
1246
 
    @dbus.service.method(_interface)
1247
 
    def CheckedOK(self):
1248
 
        self.checked_ok()
1249
 
    
1250
 
    # Enable - method
1251
 
    @dbus.service.method(_interface)
1252
 
    def Enable(self):
1253
 
        "D-Bus method"
1254
 
        self.enable()
1255
 
    
1256
 
    # StartChecker - method
1257
 
    @dbus.service.method(_interface)
1258
 
    def StartChecker(self):
1259
 
        "D-Bus method"
1260
 
        self.start_checker()
1261
 
    
1262
 
    # Disable - method
1263
 
    @dbus.service.method(_interface)
1264
 
    def Disable(self):
1265
 
        "D-Bus method"
1266
 
        self.disable()
1267
 
    
1268
 
    # StopChecker - method
1269
 
    @dbus.service.method(_interface)
1270
 
    def StopChecker(self):
1271
 
        self.stop_checker()
1272
 
    
1273
 
    ## Properties
1274
 
    
1275
 
    # ApprovalPending - property
1276
 
    @dbus_service_property(_interface, signature="b", access="read")
1277
 
    def ApprovalPending_dbus_property(self):
1278
 
        return dbus.Boolean(bool(self.approvals_pending))
1279
 
    
1280
 
    # ApprovedByDefault - property
1281
 
    @dbus_service_property(_interface, signature="b",
1282
 
                           access="readwrite")
1283
 
    def ApprovedByDefault_dbus_property(self, value=None):
1284
 
        if value is None:       # get
1285
 
            return dbus.Boolean(self.approved_by_default)
1286
 
        self.approved_by_default = bool(value)
1287
 
    
1288
 
    # ApprovalDelay - property
1289
 
    @dbus_service_property(_interface, signature="t",
1290
 
                           access="readwrite")
1291
 
    def ApprovalDelay_dbus_property(self, value=None):
1292
 
        if value is None:       # get
1293
 
            return dbus.UInt64(self.approval_delay_milliseconds())
1294
 
        self.approval_delay = datetime.timedelta(0, 0, 0, value)
1295
 
    
1296
 
    # ApprovalDuration - property
1297
 
    @dbus_service_property(_interface, signature="t",
1298
 
                           access="readwrite")
1299
 
    def ApprovalDuration_dbus_property(self, value=None):
1300
 
        if value is None:       # get
1301
 
            return dbus.UInt64(timedelta_to_milliseconds(
1302
 
                    self.approval_duration))
1303
 
        self.approval_duration = datetime.timedelta(0, 0, 0, value)
1304
 
    
1305
 
    # Name - property
1306
 
    @dbus_service_property(_interface, signature="s", access="read")
1307
 
    def Name_dbus_property(self):
1308
 
        return dbus.String(self.name)
1309
 
    
1310
 
    # Fingerprint - property
1311
 
    @dbus_service_property(_interface, signature="s", access="read")
1312
 
    def Fingerprint_dbus_property(self):
1313
 
        return dbus.String(self.fingerprint)
1314
 
    
1315
 
    # Host - property
1316
 
    @dbus_service_property(_interface, signature="s",
1317
 
                           access="readwrite")
1318
 
    def Host_dbus_property(self, value=None):
1319
 
        if value is None:       # get
1320
 
            return dbus.String(self.host)
1321
 
        self.host = unicode(value)
1322
 
    
1323
 
    # Created - property
1324
 
    @dbus_service_property(_interface, signature="s", access="read")
1325
 
    def Created_dbus_property(self):
1326
 
        return datetime_to_dbus(self.created)
1327
 
    
1328
 
    # LastEnabled - property
1329
 
    @dbus_service_property(_interface, signature="s", access="read")
1330
 
    def LastEnabled_dbus_property(self):
1331
 
        return datetime_to_dbus(self.last_enabled)
1332
 
    
1333
 
    # Enabled - property
1334
 
    @dbus_service_property(_interface, signature="b",
1335
 
                           access="readwrite")
1336
 
    def Enabled_dbus_property(self, value=None):
1337
 
        if value is None:       # get
1338
 
            return dbus.Boolean(self.enabled)
1339
 
        if value:
1340
 
            self.enable()
1341
 
        else:
1342
 
            self.disable()
1343
 
    
1344
 
    # LastCheckedOK - property
1345
 
    @dbus_service_property(_interface, signature="s",
1346
 
                           access="readwrite")
1347
 
    def LastCheckedOK_dbus_property(self, value=None):
1348
 
        if value is not None:
1349
 
            self.checked_ok()
1350
 
            return
1351
 
        return datetime_to_dbus(self.last_checked_ok)
1352
 
    
1353
 
    # Expires - property
1354
 
    @dbus_service_property(_interface, signature="s", access="read")
1355
 
    def Expires_dbus_property(self):
1356
 
        return datetime_to_dbus(self.expires)
1357
 
    
1358
 
    # LastApprovalRequest - property
1359
 
    @dbus_service_property(_interface, signature="s", access="read")
1360
 
    def LastApprovalRequest_dbus_property(self):
1361
 
        return datetime_to_dbus(self.last_approval_request)
1362
 
    
1363
 
    # Timeout - property
1364
 
    @dbus_service_property(_interface, signature="t",
1365
 
                           access="readwrite")
1366
 
    def Timeout_dbus_property(self, value=None):
1367
 
        if value is None:       # get
1368
 
            return dbus.UInt64(self.timeout_milliseconds())
1369
 
        self.timeout = datetime.timedelta(0, 0, 0, value)
1370
 
        # Reschedule timeout
1371
 
        if self.enabled:
1372
 
            now = datetime.datetime.utcnow()
1373
 
            time_to_die = timedelta_to_milliseconds(
1374
 
                (self.last_checked_ok + self.timeout) - now)
1375
 
            if time_to_die <= 0:
1376
 
                # The timeout has passed
1377
 
                self.disable()
1378
 
            else:
1379
 
                self.expires = (now +
1380
 
                                datetime.timedelta(milliseconds =
1381
 
                                                   time_to_die))
1382
 
                if (getattr(self, "disable_initiator_tag", None)
1383
 
                    is None):
1384
 
                    return
1385
 
                gobject.source_remove(self.disable_initiator_tag)
1386
 
                self.disable_initiator_tag = (gobject.timeout_add
1387
 
                                              (time_to_die,
1388
 
                                               self.disable))
1389
 
    
1390
 
    # ExtendedTimeout - property
1391
 
    @dbus_service_property(_interface, signature="t",
1392
 
                           access="readwrite")
1393
 
    def ExtendedTimeout_dbus_property(self, value=None):
1394
 
        if value is None:       # get
1395
 
            return dbus.UInt64(self.extended_timeout_milliseconds())
1396
 
        self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1397
 
    
1398
 
    # Interval - property
1399
 
    @dbus_service_property(_interface, signature="t",
1400
 
                           access="readwrite")
1401
 
    def Interval_dbus_property(self, value=None):
1402
 
        if value is None:       # get
1403
 
            return dbus.UInt64(self.interval_milliseconds())
1404
 
        self.interval = datetime.timedelta(0, 0, 0, value)
1405
 
        if getattr(self, "checker_initiator_tag", None) is None:
1406
 
            return
1407
 
        if self.enabled:
1408
 
            # Reschedule checker run
1409
 
            gobject.source_remove(self.checker_initiator_tag)
1410
 
            self.checker_initiator_tag = (gobject.timeout_add
1411
 
                                          (value, self.start_checker))
1412
 
            self.start_checker()    # Start one now, too
1413
 
    
1414
 
    # Checker - property
1415
 
    @dbus_service_property(_interface, signature="s",
1416
 
                           access="readwrite")
1417
 
    def Checker_dbus_property(self, value=None):
1418
 
        if value is None:       # get
1419
 
            return dbus.String(self.checker_command)
1420
 
        self.checker_command = unicode(value)
1421
 
    
1422
 
    # CheckerRunning - property
1423
 
    @dbus_service_property(_interface, signature="b",
1424
 
                           access="readwrite")
1425
 
    def CheckerRunning_dbus_property(self, value=None):
1426
 
        if value is None:       # get
1427
 
            return dbus.Boolean(self.checker is not None)
1428
 
        if value:
1429
 
            self.start_checker()
1430
 
        else:
1431
 
            self.stop_checker()
1432
 
    
1433
 
    # ObjectPath - property
1434
 
    @dbus_service_property(_interface, signature="o", access="read")
1435
 
    def ObjectPath_dbus_property(self):
1436
 
        return self.dbus_object_path # is already a dbus.ObjectPath
1437
 
    
1438
 
    # Secret = property
1439
 
    @dbus_service_property(_interface, signature="ay",
1440
 
                           access="write", byte_arrays=True)
1441
 
    def Secret_dbus_property(self, value):
1442
 
        self.secret = str(value)
1443
 
    
1444
 
    del _interface
1445
 
 
1446
 
 
1447
 
class ProxyClient(object):
1448
 
    def __init__(self, child_pipe, fpr, address):
1449
 
        self._pipe = child_pipe
1450
 
        self._pipe.send(('init', fpr, address))
1451
 
        if not self._pipe.recv():
1452
 
            raise KeyError()
1453
 
    
1454
 
    def __getattribute__(self, name):
1455
 
        if name == '_pipe':
1456
 
            return super(ProxyClient, self).__getattribute__(name)
1457
 
        self._pipe.send(('getattr', name))
1458
 
        data = self._pipe.recv()
1459
 
        if data[0] == 'data':
1460
 
            return data[1]
1461
 
        if data[0] == 'function':
1462
 
            def func(*args, **kwargs):
1463
 
                self._pipe.send(('funcall', name, args, kwargs))
1464
 
                return self._pipe.recv()[1]
1465
 
            return func
1466
 
    
1467
 
    def __setattr__(self, name, value):
1468
 
        if name == '_pipe':
1469
 
            return super(ProxyClient, self).__setattr__(name, value)
1470
 
        self._pipe.send(('setattr', name, value))
1471
 
 
1472
 
 
1473
 
class ClientDBusTransitional(ClientDBus):
1474
 
    __metaclass__ = AlternateDBusNamesMetaclass
1475
 
 
1476
 
 
1477
 
class ClientHandler(socketserver.BaseRequestHandler, object):
1478
 
    """A class to handle client connections.
1479
 
    
1480
 
    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.
1481
307
    Note: This will run in its own forked process."""
1482
308
    
1483
309
    def handle(self):
1484
 
        with contextlib.closing(self.server.child_pipe) as child_pipe:
1485
 
            logger.info("TCP connection from: %s",
1486
 
                        unicode(self.client_address))
1487
 
            logger.debug("Pipe FD: %d",
1488
 
                         self.server.child_pipe.fileno())
1489
 
            
1490
 
            session = (gnutls.connection
1491
 
                       .ClientSession(self.request,
1492
 
                                      gnutls.connection
1493
 
                                      .X509Credentials()))
1494
 
            
1495
 
            # Note: gnutls.connection.X509Credentials is really a
1496
 
            # generic GnuTLS certificate credentials object so long as
1497
 
            # no X.509 keys are added to it.  Therefore, we can use it
1498
 
            # here despite using OpenPGP certificates.
1499
 
            
1500
 
            #priority = ':'.join(("NONE", "+VERS-TLS1.1",
1501
 
            #                      "+AES-256-CBC", "+SHA1",
1502
 
            #                      "+COMP-NULL", "+CTYPE-OPENPGP",
1503
 
            #                      "+DHE-DSS"))
1504
 
            # Use a fallback default, since this MUST be set.
1505
 
            priority = self.server.gnutls_priority
1506
 
            if priority is None:
1507
 
                priority = "NORMAL"
1508
 
            (gnutls.library.functions
1509
 
             .gnutls_priority_set_direct(session._c_object,
1510
 
                                         priority, None))
1511
 
            
1512
 
            # Start communication using the Mandos protocol
1513
 
            # Get protocol number
1514
 
            line = self.request.makefile().readline()
1515
 
            logger.debug("Protocol version: %r", line)
1516
 
            try:
1517
 
                if int(line.strip().split()[0]) > 1:
1518
 
                    raise RuntimeError
1519
 
            except (ValueError, IndexError, RuntimeError) as error:
1520
 
                logger.error("Unknown protocol version: %s", error)
1521
 
                return
1522
 
            
1523
 
            # Start GnuTLS connection
1524
 
            try:
1525
 
                session.handshake()
1526
 
            except gnutls.errors.GNUTLSError as error:
1527
 
                logger.warning("Handshake failed: %s", error)
1528
 
                # Do not run session.bye() here: the session is not
1529
 
                # established.  Just abandon the request.
1530
 
                return
1531
 
            logger.debug("Handshake succeeded")
1532
 
            
1533
 
            approval_required = False
1534
 
            try:
1535
 
                try:
1536
 
                    fpr = self.fingerprint(self.peer_certificate
1537
 
                                           (session))
1538
 
                except (TypeError,
1539
 
                        gnutls.errors.GNUTLSError) as error:
1540
 
                    logger.warning("Bad certificate: %s", error)
1541
 
                    return
1542
 
                logger.debug("Fingerprint: %s", fpr)
1543
 
                
1544
 
                try:
1545
 
                    client = ProxyClient(child_pipe, fpr,
1546
 
                                         self.client_address)
1547
 
                except KeyError:
1548
 
                    return
1549
 
                
1550
 
                if self.server.use_dbus:
1551
 
                    # Emit D-Bus signal
1552
 
                    client.NewRequest(str(self.client_address))
1553
 
                
1554
 
                if client.approval_delay:
1555
 
                    delay = client.approval_delay
1556
 
                    client.approvals_pending += 1
1557
 
                    approval_required = True
1558
 
                
1559
 
                while True:
1560
 
                    if not client.enabled:
1561
 
                        logger.info("Client %s is disabled",
1562
 
                                       client.name)
1563
 
                        if self.server.use_dbus:
1564
 
                            # Emit D-Bus signal
1565
 
                            client.Rejected("Disabled")
1566
 
                        return
1567
 
                    
1568
 
                    if client.approved or not client.approval_delay:
1569
 
                        #We are approved or approval is disabled
1570
 
                        break
1571
 
                    elif client.approved is None:
1572
 
                        logger.info("Client %s needs approval",
1573
 
                                    client.name)
1574
 
                        if self.server.use_dbus:
1575
 
                            # Emit D-Bus signal
1576
 
                            client.NeedApproval(
1577
 
                                client.approval_delay_milliseconds(),
1578
 
                                client.approved_by_default)
1579
 
                    else:
1580
 
                        logger.warning("Client %s was not approved",
1581
 
                                       client.name)
1582
 
                        if self.server.use_dbus:
1583
 
                            # Emit D-Bus signal
1584
 
                            client.Rejected("Denied")
1585
 
                        return
1586
 
                    
1587
 
                    #wait until timeout or approved
1588
 
                    time = datetime.datetime.now()
1589
 
                    client.changedstate.acquire()
1590
 
                    (client.changedstate.wait
1591
 
                     (float(client.timedelta_to_milliseconds(delay)
1592
 
                            / 1000)))
1593
 
                    client.changedstate.release()
1594
 
                    time2 = datetime.datetime.now()
1595
 
                    if (time2 - time) >= delay:
1596
 
                        if not client.approved_by_default:
1597
 
                            logger.warning("Client %s timed out while"
1598
 
                                           " waiting for approval",
1599
 
                                           client.name)
1600
 
                            if self.server.use_dbus:
1601
 
                                # Emit D-Bus signal
1602
 
                                client.Rejected("Approval timed out")
1603
 
                            return
1604
 
                        else:
1605
 
                            break
1606
 
                    else:
1607
 
                        delay -= time2 - time
1608
 
                
1609
 
                sent_size = 0
1610
 
                while sent_size < len(client.secret):
1611
 
                    try:
1612
 
                        sent = session.send(client.secret[sent_size:])
1613
 
                    except gnutls.errors.GNUTLSError as error:
1614
 
                        logger.warning("gnutls send failed")
1615
 
                        return
1616
 
                    logger.debug("Sent: %d, remaining: %d",
1617
 
                                 sent, len(client.secret)
1618
 
                                 - (sent_size + sent))
1619
 
                    sent_size += sent
1620
 
                
1621
 
                logger.info("Sending secret to %s", client.name)
1622
 
                # bump the timeout using extended_timeout
1623
 
                client.checked_ok(client.extended_timeout)
1624
 
                if self.server.use_dbus:
1625
 
                    # Emit D-Bus signal
1626
 
                    client.GotSecret()
1627
 
            
1628
 
            finally:
1629
 
                if approval_required:
1630
 
                    client.approvals_pending -= 1
1631
 
                try:
1632
 
                    session.bye()
1633
 
                except gnutls.errors.GNUTLSError as error:
1634
 
                    logger.warning("GnuTLS bye failed")
1635
 
    
1636
 
    @staticmethod
1637
 
    def peer_certificate(session):
1638
 
        "Return the peer's OpenPGP certificate as a bytestring"
1639
 
        # If not an OpenPGP certificate...
1640
 
        if (gnutls.library.functions
1641
 
            .gnutls_certificate_type_get(session._c_object)
1642
 
            != gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1643
 
            # ...do the normal thing
1644
 
            return session.peer_certificate
1645
 
        list_size = ctypes.c_uint(1)
1646
 
        cert_list = (gnutls.library.functions
1647
 
                     .gnutls_certificate_get_peers
1648
 
                     (session._c_object, ctypes.byref(list_size)))
1649
 
        if not bool(cert_list) and list_size.value != 0:
1650
 
            raise gnutls.errors.GNUTLSError("error getting peer"
1651
 
                                            " certificate")
1652
 
        if list_size.value == 0:
1653
 
            return None
1654
 
        cert = cert_list[0]
1655
 
        return ctypes.string_at(cert.data, cert.size)
1656
 
    
1657
 
    @staticmethod
1658
 
    def fingerprint(openpgp):
1659
 
        "Convert an OpenPGP bytestring to a hexdigit fingerprint"
1660
 
        # New GnuTLS "datum" with the OpenPGP public key
1661
 
        datum = (gnutls.library.types
1662
 
                 .gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1663
 
                                             ctypes.POINTER
1664
 
                                             (ctypes.c_ubyte)),
1665
 
                                 ctypes.c_uint(len(openpgp))))
1666
 
        # New empty GnuTLS certificate
1667
 
        crt = gnutls.library.types.gnutls_openpgp_crt_t()
1668
 
        (gnutls.library.functions
1669
 
         .gnutls_openpgp_crt_init(ctypes.byref(crt)))
1670
 
        # Import the OpenPGP public key into the certificate
1671
 
        (gnutls.library.functions
1672
 
         .gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1673
 
                                    gnutls.library.constants
1674
 
                                    .GNUTLS_OPENPGP_FMT_RAW))
1675
 
        # Verify the self signature in the key
1676
 
        crtverify = ctypes.c_uint()
1677
 
        (gnutls.library.functions
1678
 
         .gnutls_openpgp_crt_verify_self(crt, 0,
1679
 
                                         ctypes.byref(crtverify)))
1680
 
        if crtverify.value != 0:
1681
 
            gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1682
 
            raise (gnutls.errors.CertificateSecurityError
1683
 
                   ("Verify failed"))
1684
 
        # New buffer for the fingerprint
1685
 
        buf = ctypes.create_string_buffer(20)
1686
 
        buf_len = ctypes.c_size_t()
1687
 
        # Get the fingerprint from the certificate into the buffer
1688
 
        (gnutls.library.functions
1689
 
         .gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1690
 
                                             ctypes.byref(buf_len)))
1691
 
        # Deinit the certificate
1692
 
        gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1693
 
        # Convert the buffer to a Python bytestring
1694
 
        fpr = ctypes.string_at(buf, buf_len.value)
1695
 
        # Convert the bytestring to hexadecimal notation
1696
 
        hex_fpr = binascii.hexlify(fpr).upper()
1697
 
        return hex_fpr
1698
 
 
1699
 
 
1700
 
class MultiprocessingMixIn(object):
1701
 
    """Like socketserver.ThreadingMixIn, but with multiprocessing"""
1702
 
    def sub_process_main(self, request, address):
1703
 
        try:
1704
 
            self.finish_request(request, address)
1705
 
        except Exception:
1706
 
            self.handle_error(request, address)
1707
 
        self.close_request(request)
1708
 
    
1709
 
    def process_request(self, request, address):
1710
 
        """Start a new process to process the request."""
1711
 
        proc = multiprocessing.Process(target = self.sub_process_main,
1712
 
                                       args = (request,
1713
 
                                               address))
1714
 
        proc.start()
1715
 
        return proc
1716
 
 
1717
 
 
1718
 
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1719
 
    """ adds a pipe to the MixIn """
1720
 
    def process_request(self, request, client_address):
1721
 
        """Overrides and wraps the original process_request().
1722
 
        
1723
 
        This function creates a new pipe in self.pipe
1724
 
        """
1725
 
        parent_pipe, self.child_pipe = multiprocessing.Pipe()
1726
 
        
1727
 
        proc = MultiprocessingMixIn.process_request(self, request,
1728
 
                                                    client_address)
1729
 
        self.child_pipe.close()
1730
 
        self.add_pipe(parent_pipe, proc)
1731
 
    
1732
 
    def add_pipe(self, parent_pipe, proc):
1733
 
        """Dummy function; override as necessary"""
1734
 
        raise NotImplementedError
1735
 
 
1736
 
 
1737
 
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1738
 
                     socketserver.TCPServer, object):
1739
 
    """IPv6-capable TCP server.  Accepts 'None' as address and/or port
1740
 
    
 
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.
1741
367
    Attributes:
1742
 
        enabled:        Boolean; whether this server is activated yet
1743
 
        interface:      None or a network interface name (string)
1744
 
        use_ipv6:       Boolean; to use IPv6 or not
 
368
        options:        Command line options
 
369
        clients:        Set() of Client objects
1745
370
    """
1746
 
    def __init__(self, server_address, RequestHandlerClass,
1747
 
                 interface=None, use_ipv6=True):
1748
 
        self.interface = interface
1749
 
        if use_ipv6:
1750
 
            self.address_family = socket.AF_INET6
1751
 
        socketserver.TCPServer.__init__(self, server_address,
1752
 
                                        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)
1753
380
    def server_bind(self):
1754
381
        """This overrides the normal server_bind() function
1755
382
        to bind to an interface if one was specified, and also NOT to
1756
383
        bind to an address or port if they were not specified."""
1757
 
        if self.interface is not None:
1758
 
            if SO_BINDTODEVICE is None:
1759
 
                logger.error("SO_BINDTODEVICE does not exist;"
1760
 
                             " cannot bind to interface %s",
1761
 
                             self.interface)
1762
 
            else:
1763
 
                try:
1764
 
                    self.socket.setsockopt(socket.SOL_SOCKET,
1765
 
                                           SO_BINDTODEVICE,
1766
 
                                           str(self.interface
1767
 
                                               + '\0'))
1768
 
                except socket.error as error:
1769
 
                    if error[0] == errno.EPERM:
1770
 
                        logger.error("No permission to"
1771
 
                                     " bind to interface %s",
1772
 
                                     self.interface)
1773
 
                    elif error[0] == errno.ENOPROTOOPT:
1774
 
                        logger.error("SO_BINDTODEVICE not available;"
1775
 
                                     " cannot bind to interface %s",
1776
 
                                     self.interface)
1777
 
                    else:
1778
 
                        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
1779
399
        # Only bind(2) the socket if we really need to.
1780
400
        if self.server_address[0] or self.server_address[1]:
1781
401
            if not self.server_address[0]:
1782
 
                if self.address_family == socket.AF_INET6:
1783
 
                    any_address = "::" # in6addr_any
1784
 
                else:
1785
 
                    any_address = socket.INADDR_ANY
1786
 
                self.server_address = (any_address,
 
402
                in6addr_any = "::"
 
403
                self.server_address = (in6addr_any,
1787
404
                                       self.server_address[1])
1788
 
            elif not self.server_address[1]:
 
405
            elif self.server_address[1] is None:
1789
406
                self.server_address = (self.server_address[0],
1790
407
                                       0)
1791
 
#                 if self.interface:
1792
 
#                     self.server_address = (self.server_address[0],
1793
 
#                                            0, # port
1794
 
#                                            0, # flowinfo
1795
 
#                                            if_nametoindex
1796
 
#                                            (self.interface))
1797
 
            return socketserver.TCPServer.server_bind(self)
1798
 
 
1799
 
 
1800
 
class MandosServer(IPv6_TCPServer):
1801
 
    """Mandos server.
1802
 
    
1803
 
    Attributes:
1804
 
        clients:        set of Client objects
1805
 
        gnutls_priority GnuTLS priority string
1806
 
        use_dbus:       Boolean; to emit D-Bus signals or not
1807
 
    
1808
 
    Assumes a gobject.MainLoop event loop.
1809
 
    """
1810
 
    def __init__(self, server_address, RequestHandlerClass,
1811
 
                 interface=None, use_ipv6=True, clients=None,
1812
 
                 gnutls_priority=None, use_dbus=True):
1813
 
        self.enabled = False
1814
 
        self.clients = clients
1815
 
        if self.clients is None:
1816
 
            self.clients = {}
1817
 
        self.use_dbus = use_dbus
1818
 
        self.gnutls_priority = gnutls_priority
1819
 
        IPv6_TCPServer.__init__(self, server_address,
1820
 
                                RequestHandlerClass,
1821
 
                                interface = interface,
1822
 
                                use_ipv6 = use_ipv6)
1823
 
    def server_activate(self):
1824
 
        if self.enabled:
1825
 
            return socketserver.TCPServer.server_activate(self)
1826
 
    
1827
 
    def enable(self):
1828
 
        self.enabled = True
1829
 
    
1830
 
    def add_pipe(self, parent_pipe, proc):
1831
 
        # Call "handle_ipc" for both data and EOF events
1832
 
        gobject.io_add_watch(parent_pipe.fileno(),
1833
 
                             gobject.IO_IN | gobject.IO_HUP,
1834
 
                             functools.partial(self.handle_ipc,
1835
 
                                               parent_pipe =
1836
 
                                               parent_pipe,
1837
 
                                               proc = proc))
1838
 
    
1839
 
    def handle_ipc(self, source, condition, parent_pipe=None,
1840
 
                   proc = None, client_object=None):
1841
 
        condition_names = {
1842
 
            gobject.IO_IN: "IN",   # There is data to read.
1843
 
            gobject.IO_OUT: "OUT", # Data can be written (without
1844
 
                                    # blocking).
1845
 
            gobject.IO_PRI: "PRI", # There is urgent data to read.
1846
 
            gobject.IO_ERR: "ERR", # Error condition.
1847
 
            gobject.IO_HUP: "HUP"  # Hung up (the connection has been
1848
 
                                    # broken, usually for pipes and
1849
 
                                    # sockets).
1850
 
            }
1851
 
        conditions_string = ' | '.join(name
1852
 
                                       for cond, name in
1853
 
                                       condition_names.iteritems()
1854
 
                                       if cond & condition)
1855
 
        # error, or the other end of multiprocessing.Pipe has closed
1856
 
        if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):
1857
 
            # Wait for other process to exit
1858
 
            proc.join()
1859
 
            return False
1860
 
        
1861
 
        # Read a request from the child
1862
 
        request = parent_pipe.recv()
1863
 
        command = request[0]
1864
 
        
1865
 
        if command == 'init':
1866
 
            fpr = request[1]
1867
 
            address = request[2]
1868
 
            
1869
 
            for c in self.clients.itervalues():
1870
 
                if c.fingerprint == fpr:
1871
 
                    client = c
1872
 
                    break
1873
 
            else:
1874
 
                logger.info("Client not found for fingerprint: %s, ad"
1875
 
                            "dress: %s", fpr, address)
1876
 
                if self.use_dbus:
1877
 
                    # Emit D-Bus signal
1878
 
                    mandos_dbus_service.ClientNotFound(fpr,
1879
 
                                                       address[0])
1880
 
                parent_pipe.send(False)
1881
 
                return False
1882
 
            
1883
 
            gobject.io_add_watch(parent_pipe.fileno(),
1884
 
                                 gobject.IO_IN | gobject.IO_HUP,
1885
 
                                 functools.partial(self.handle_ipc,
1886
 
                                                   parent_pipe =
1887
 
                                                   parent_pipe,
1888
 
                                                   proc = proc,
1889
 
                                                   client_object =
1890
 
                                                   client))
1891
 
            parent_pipe.send(True)
1892
 
            # remove the old hook in favor of the new above hook on
1893
 
            # same fileno
1894
 
            return False
1895
 
        if command == 'funcall':
1896
 
            funcname = request[1]
1897
 
            args = request[2]
1898
 
            kwargs = request[3]
1899
 
            
1900
 
            parent_pipe.send(('data', getattr(client_object,
1901
 
                                              funcname)(*args,
1902
 
                                                         **kwargs)))
1903
 
        
1904
 
        if command == 'getattr':
1905
 
            attrname = request[1]
1906
 
            if callable(client_object.__getattribute__(attrname)):
1907
 
                parent_pipe.send(('function',))
1908
 
            else:
1909
 
                parent_pipe.send(('data', client_object
1910
 
                                  .__getattribute__(attrname)))
1911
 
        
1912
 
        if command == 'setattr':
1913
 
            attrname = request[1]
1914
 
            value = request[2]
1915
 
            setattr(client_object, attrname, value)
1916
 
        
1917
 
        return True
 
408
            return super(type(self), self).server_bind()
1918
409
 
1919
410
 
1920
411
def string_to_delta(interval):
1921
412
    """Parse a string and return a datetime.timedelta
1922
 
    
 
413
 
1923
414
    >>> string_to_delta('7d')
1924
415
    datetime.timedelta(7)
1925
416
    >>> string_to_delta('60s')
1928
419
    datetime.timedelta(0, 3600)
1929
420
    >>> string_to_delta('24h')
1930
421
    datetime.timedelta(1)
1931
 
    >>> string_to_delta('1w')
 
422
    >>> string_to_delta(u'1w')
1932
423
    datetime.timedelta(7)
1933
 
    >>> string_to_delta('5m 30s')
1934
 
    datetime.timedelta(0, 330)
1935
424
    """
1936
 
    timevalue = datetime.timedelta(0)
1937
 
    for s in interval.split():
1938
 
        try:
1939
 
            suffix = unicode(s[-1])
1940
 
            value = int(s[:-1])
1941
 
            if suffix == "d":
1942
 
                delta = datetime.timedelta(value)
1943
 
            elif suffix == "s":
1944
 
                delta = datetime.timedelta(0, value)
1945
 
            elif suffix == "m":
1946
 
                delta = datetime.timedelta(0, 0, 0, 0, value)
1947
 
            elif suffix == "h":
1948
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1949
 
            elif suffix == "w":
1950
 
                delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1951
 
            else:
1952
 
                raise ValueError("Unknown suffix %r" % suffix)
1953
 
        except (ValueError, IndexError) as e:
1954
 
            raise ValueError(*(e.args))
1955
 
        timevalue += delta
1956
 
    return timevalue
1957
 
 
1958
 
 
1959
 
def daemon(nochdir = False, noclose = False):
1960
 
    """See daemon(3).  Standard BSD Unix function.
1961
 
    
1962
 
    This should really exist as os.daemon, but it doesn't (yet)."""
1963
 
    if os.fork():
1964
 
        sys.exit()
1965
 
    os.setsid()
1966
 
    if not nochdir:
1967
 
        os.chdir("/")
1968
 
    if os.fork():
1969
 
        sys.exit()
1970
 
    if not noclose:
1971
 
        # Close all standard open file descriptors
1972
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1973
 
        if not stat.S_ISCHR(os.fstat(null).st_mode):
1974
 
            raise OSError(errno.ENODEV,
1975
 
                          "%s not a character device"
1976
 
                          % os.path.devnull)
1977
 
        os.dup2(null, sys.stdin.fileno())
1978
 
        os.dup2(null, sys.stdout.fileno())
1979
 
        os.dup2(null, sys.stderr.fileno())
1980
 
        if null > 2:
1981
 
            os.close(null)
1982
 
 
1983
 
 
1984
 
def main():
1985
 
    
1986
 
    ##################################################################
1987
 
    # Parsing of options, both command line and config file
1988
 
    
1989
 
    parser = argparse.ArgumentParser()
1990
 
    parser.add_argument("-v", "--version", action="version",
1991
 
                        version = "%%(prog)s %s" % version,
1992
 
                        help="show version number and exit")
1993
 
    parser.add_argument("-i", "--interface", metavar="IF",
1994
 
                        help="Bind to interface IF")
1995
 
    parser.add_argument("-a", "--address",
1996
 
                        help="Address to listen for requests on")
1997
 
    parser.add_argument("-p", "--port", type=int,
1998
 
                        help="Port number to receive requests on")
1999
 
    parser.add_argument("--check", action="store_true",
2000
 
                        help="Run self-test")
2001
 
    parser.add_argument("--debug", action="store_true",
2002
 
                        help="Debug mode; run in foreground and log"
2003
 
                        " to terminal")
2004
 
    parser.add_argument("--debuglevel", metavar="LEVEL",
2005
 
                        help="Debug level for stdout output")
2006
 
    parser.add_argument("--priority", help="GnuTLS"
2007
 
                        " priority string (see GnuTLS documentation)")
2008
 
    parser.add_argument("--servicename",
2009
 
                        metavar="NAME", help="Zeroconf service name")
2010
 
    parser.add_argument("--configdir",
2011
 
                        default="/etc/mandos", metavar="DIR",
2012
 
                        help="Directory to search for configuration"
2013
 
                        " files")
2014
 
    parser.add_argument("--no-dbus", action="store_false",
2015
 
                        dest="use_dbus", help="Do not provide D-Bus"
2016
 
                        " system bus interface")
2017
 
    parser.add_argument("--no-ipv6", action="store_false",
2018
 
                        dest="use_ipv6", help="Do not use IPv6")
2019
 
    parser.add_argument("--no-restore", action="store_false",
2020
 
                        dest="restore", help="Do not restore stored"
2021
 
                        " state")
2022
 
    parser.add_argument("--statedir", metavar="DIR",
2023
 
                        help="Directory to save/restore state in")
2024
 
    
2025
 
    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()
2026
566
    
2027
567
    if options.check:
2028
568
        import doctest
2029
569
        doctest.testmod()
2030
570
        sys.exit()
2031
571
    
2032
 
    # Default values for config file for server-global settings
2033
 
    server_defaults = { "interface": "",
2034
 
                        "address": "",
2035
 
                        "port": "",
2036
 
                        "debug": "False",
2037
 
                        "priority":
2038
 
                        "SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
2039
 
                        "servicename": "Mandos",
2040
 
                        "use_dbus": "True",
2041
 
                        "use_ipv6": "True",
2042
 
                        "debuglevel": "",
2043
 
                        "restore": "True",
2044
 
                        "statedir": "/var/lib/mandos"
2045
 
                        }
2046
 
    
2047
 
    # Parse config file for server-global settings
2048
 
    server_config = configparser.SafeConfigParser(server_defaults)
2049
 
    del server_defaults
2050
 
    server_config.read(os.path.join(options.configdir,
2051
 
                                    "mandos.conf"))
2052
 
    # Convert the SafeConfigParser object to a dict
2053
 
    server_settings = server_config.defaults()
2054
 
    # Use the appropriate methods on the non-string config options
2055
 
    for option in ("debug", "use_dbus", "use_ipv6"):
2056
 
        server_settings[option] = server_config.getboolean("DEFAULT",
2057
 
                                                           option)
2058
 
    if server_settings["port"]:
2059
 
        server_settings["port"] = server_config.getint("DEFAULT",
2060
 
                                                       "port")
2061
 
    del server_config
2062
 
    
2063
 
    # Override the settings from the config file with command line
2064
 
    # options, if set.
2065
 
    for option in ("interface", "address", "port", "debug",
2066
 
                   "priority", "servicename", "configdir",
2067
 
                   "use_dbus", "use_ipv6", "debuglevel", "restore",
2068
 
                   "statedir"):
2069
 
        value = getattr(options, option)
2070
 
        if value is not None:
2071
 
            server_settings[option] = value
2072
 
    del options
2073
 
    # Force all strings to be unicode
2074
 
    for option in server_settings.keys():
2075
 
        if type(server_settings[option]) is str:
2076
 
            server_settings[option] = unicode(server_settings[option])
2077
 
    # Now we have our good server settings in "server_settings"
2078
 
    
2079
 
    ##################################################################
2080
 
    
2081
 
    # For convenience
2082
 
    debug = server_settings["debug"]
2083
 
    debuglevel = server_settings["debuglevel"]
2084
 
    use_dbus = server_settings["use_dbus"]
2085
 
    use_ipv6 = server_settings["use_ipv6"]
2086
 
    stored_state_path = os.path.join(server_settings["statedir"],
2087
 
                                     stored_state_file)
2088
 
    
2089
 
    if debug:
2090
 
        initlogger(debug, logging.DEBUG)
2091
 
    else:
2092
 
        if not debuglevel:
2093
 
            initlogger(debug)
2094
 
        else:
2095
 
            level = getattr(logging, debuglevel.upper())
2096
 
            initlogger(debug, level)
2097
 
    
2098
 
    if server_settings["servicename"] != "Mandos":
2099
 
        syslogger.setFormatter(logging.Formatter
2100
 
                               ('Mandos (%s) [%%(process)d]:'
2101
 
                                ' %%(levelname)s: %%(message)s'
2102
 
                                % server_settings["servicename"]))
2103
 
    
2104
 
    # Parse config file with clients
2105
 
    client_config = configparser.SafeConfigParser(Client
2106
 
                                                  .client_defaults)
2107
 
    client_config.read(os.path.join(server_settings["configdir"],
2108
 
                                    "clients.conf"))
2109
 
    
2110
 
    global mandos_dbus_service
2111
 
    mandos_dbus_service = None
2112
 
    
2113
 
    tcp_server = MandosServer((server_settings["address"],
2114
 
                               server_settings["port"]),
2115
 
                              ClientHandler,
2116
 
                              interface=(server_settings["interface"]
2117
 
                                         or None),
2118
 
                              use_ipv6=use_ipv6,
2119
 
                              gnutls_priority=
2120
 
                              server_settings["priority"],
2121
 
                              use_dbus=use_dbus)
2122
 
    if not debug:
2123
 
        pidfilename = "/var/run/mandos.pid"
2124
 
        try:
2125
 
            pidfile = open(pidfilename, "w")
2126
 
        except IOError:
2127
 
            logger.error("Could not open file %r", pidfilename)
2128
 
    
2129
 
    try:
2130
 
        uid = pwd.getpwnam("_mandos").pw_uid
2131
 
        gid = pwd.getpwnam("_mandos").pw_gid
2132
 
    except KeyError:
2133
 
        try:
2134
 
            uid = pwd.getpwnam("mandos").pw_uid
2135
 
            gid = pwd.getpwnam("mandos").pw_gid
2136
 
        except KeyError:
2137
 
            try:
2138
 
                uid = pwd.getpwnam("nobody").pw_uid
2139
 
                gid = pwd.getpwnam("nobody").pw_gid
2140
 
            except KeyError:
2141
 
                uid = 65534
2142
 
                gid = 65534
2143
 
    try:
2144
 
        os.setgid(gid)
2145
 
        os.setuid(uid)
2146
 
    except OSError as error:
2147
 
        if error[0] != errno.EPERM:
2148
 
            raise error
2149
 
    
2150
 
    if debug:
2151
 
        # Enable all possible GnuTLS debugging
2152
 
        
2153
 
        # "Use a log level over 10 to enable all debugging options."
2154
 
        # - GnuTLS manual
2155
 
        gnutls.library.functions.gnutls_global_set_log_level(11)
2156
 
        
2157
 
        @gnutls.library.types.gnutls_log_func
2158
 
        def debug_gnutls(level, string):
2159
 
            logger.debug("GnuTLS: %s", string[:-1])
2160
 
        
2161
 
        (gnutls.library.functions
2162
 
         .gnutls_global_set_log_function(debug_gnutls))
2163
 
        
2164
 
        # Redirect stdin so all checkers get /dev/null
2165
 
        null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
2166
 
        os.dup2(null, sys.stdin.fileno())
2167
 
        if null > 2:
2168
 
            os.close(null)
2169
 
    
2170
 
    # Need to fork before connecting to D-Bus
2171
 
    if not debug:
2172
 
        # Close all input and output, do double fork, etc.
2173
 
        daemon()
2174
 
    
2175
 
    gobject.threads_init()
2176
 
    
2177
 
    global main_loop
2178
 
    # 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
2179
589
    DBusGMainLoop(set_as_default=True )
2180
590
    main_loop = gobject.MainLoop()
2181
591
    bus = dbus.SystemBus()
2182
 
    # End of Avahi example code
2183
 
    if use_dbus:
2184
 
        try:
2185
 
            bus_name = dbus.service.BusName("se.recompile.Mandos",
2186
 
                                            bus, do_not_queue=True)
2187
 
            old_bus_name = (dbus.service.BusName
2188
 
                            ("se.bsnet.fukt.Mandos", bus,
2189
 
                             do_not_queue=True))
2190
 
        except dbus.exceptions.NameExistsException as e:
2191
 
            logger.error(unicode(e) + ", disabling D-Bus")
2192
 
            use_dbus = False
2193
 
            server_settings["use_dbus"] = False
2194
 
            tcp_server.use_dbus = False
2195
 
    protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2196
 
    service = AvahiServiceToSyslog(name =
2197
 
                                   server_settings["servicename"],
2198
 
                                   servicetype = "_mandos._tcp",
2199
 
                                   protocol = protocol, bus = bus)
2200
 
    if server_settings["interface"]:
2201
 
        service.interface = (if_nametoindex
2202
 
                             (str(server_settings["interface"])))
2203
 
    
2204
 
    global multiprocessing_manager
2205
 
    multiprocessing_manager = multiprocessing.Manager()
2206
 
    
2207
 
    client_class = Client
2208
 
    if use_dbus:
2209
 
        client_class = functools.partial(ClientDBusTransitional,
2210
 
                                         bus = bus)
2211
 
    
2212
 
    client_settings = Client.config_parser(client_config)
2213
 
    old_client_settings = {}
2214
 
    clients_data = {}
2215
 
    
2216
 
    # Get client data and settings from last running state.
2217
 
    if server_settings["restore"]:
2218
 
        try:
2219
 
            with open(stored_state_path, "rb") as stored_state:
2220
 
                clients_data, old_client_settings = (pickle.load
2221
 
                                                     (stored_state))
2222
 
            os.remove(stored_state_path)
2223
 
        except IOError as e:
2224
 
            logger.warning("Could not load persistent state: {0}"
2225
 
                           .format(e))
2226
 
            if e.errno != errno.ENOENT:
2227
 
                raise
2228
 
        except EOFError as e:
2229
 
            logger.warning("Could not load persistent state: "
2230
 
                           "EOFError: {0}".format(e))
2231
 
    
2232
 
    with PGPEngine() as pgp:
2233
 
        for client_name, client in clients_data.iteritems():
2234
 
            # Decide which value to use after restoring saved state.
2235
 
            # We have three different values: Old config file,
2236
 
            # new config file, and saved state.
2237
 
            # New config value takes precedence if it differs from old
2238
 
            # config value, otherwise use saved state.
2239
 
            for name, value in client_settings[client_name].items():
2240
 
                try:
2241
 
                    # For each value in new config, check if it
2242
 
                    # differs from the old config value (Except for
2243
 
                    # the "secret" attribute)
2244
 
                    if (name != "secret" and
2245
 
                        value != old_client_settings[client_name]
2246
 
                        [name]):
2247
 
                        client[name] = value
2248
 
                except KeyError:
2249
 
                    pass
2250
 
            
2251
 
            # Clients who has passed its expire date can still be
2252
 
            # enabled if its last checker was successful.  Clients
2253
 
            # whose checker failed before we stored its state is
2254
 
            # assumed to have failed all checkers during downtime.
2255
 
            if client["enabled"]:
2256
 
                if datetime.datetime.utcnow() >= client["expires"]:
2257
 
                    if not client["last_checked_ok"]:
2258
 
                        logger.warning(
2259
 
                            "disabling client {0} - Client never "
2260
 
                            "performed a successfull checker"
2261
 
                            .format(client["name"]))
2262
 
                        client["enabled"] = False
2263
 
                    elif client["last_checker_status"] != 0:
2264
 
                        logger.warning(
2265
 
                            "disabling client {0} - Client "
2266
 
                            "last checker failed with error code {1}"
2267
 
                            .format(client["name"],
2268
 
                                    client["last_checker_status"]))
2269
 
                        client["enabled"] = False
2270
 
                    else:
2271
 
                        client["expires"] = (datetime.datetime
2272
 
                                             .utcnow()
2273
 
                                             + client["timeout"])
2274
 
                        logger.debug("Last checker succeeded,"
2275
 
                                     " keeping {0} enabled"
2276
 
                                     .format(client["name"]))
2277
 
            try:
2278
 
                client["secret"] = (
2279
 
                    pgp.decrypt(client["encrypted_secret"],
2280
 
                                client_settings[client_name]
2281
 
                                ["secret"]))
2282
 
            except PGPError:
2283
 
                # If decryption fails, we use secret from new settings
2284
 
                logger.debug("Failed to decrypt {0} old secret"
2285
 
                             .format(client_name))
2286
 
                client["secret"] = (
2287
 
                    client_settings[client_name]["secret"])
2288
 
 
2289
 
    
2290
 
    # Add/remove clients based on new changes made to config
2291
 
    for client_name in (set(old_client_settings)
2292
 
                        - set(client_settings)):
2293
 
        del clients_data[client_name]
2294
 
    for client_name in (set(client_settings)
2295
 
                        - set(old_client_settings)):
2296
 
        clients_data[client_name] = client_settings[client_name]
2297
 
 
2298
 
    # Create clients all clients
2299
 
    for client_name, client in clients_data.iteritems():
2300
 
        tcp_server.clients[client_name] = client_class(
2301
 
            name = client_name, settings = client)
2302
 
    
2303
 
    if not tcp_server.clients:
2304
 
        logger.warning("No clients defined")
2305
 
        
2306
 
    if not debug:
2307
 
        try:
2308
 
            with pidfile:
2309
 
                pid = os.getpid()
2310
 
                pidfile.write(str(pid) + "\n".encode("utf-8"))
2311
 
            del pidfile
2312
 
        except IOError:
2313
 
            logger.error("Could not write to file %r with PID %d",
2314
 
                         pidfilename, pid)
2315
 
        except NameError:
2316
 
            # "pidfile" was never created
2317
 
            pass
2318
 
        del pidfilename
2319
 
        signal.signal(signal.SIGINT, signal.SIG_IGN)
2320
 
    
2321
 
    signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2322
 
    signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2323
 
    
2324
 
    if use_dbus:
2325
 
        class MandosDBusService(dbus.service.Object):
2326
 
            """A D-Bus proxy object"""
2327
 
            def __init__(self):
2328
 
                dbus.service.Object.__init__(self, bus, "/")
2329
 
            _interface = "se.recompile.Mandos"
2330
 
            
2331
 
            @dbus.service.signal(_interface, signature="o")
2332
 
            def ClientAdded(self, objpath):
2333
 
                "D-Bus signal"
2334
 
                pass
2335
 
            
2336
 
            @dbus.service.signal(_interface, signature="ss")
2337
 
            def ClientNotFound(self, fingerprint, address):
2338
 
                "D-Bus signal"
2339
 
                pass
2340
 
            
2341
 
            @dbus.service.signal(_interface, signature="os")
2342
 
            def ClientRemoved(self, objpath, name):
2343
 
                "D-Bus signal"
2344
 
                pass
2345
 
            
2346
 
            @dbus.service.method(_interface, out_signature="ao")
2347
 
            def GetAllClients(self):
2348
 
                "D-Bus method"
2349
 
                return dbus.Array(c.dbus_object_path
2350
 
                                  for c in
2351
 
                                  tcp_server.clients.itervalues())
2352
 
            
2353
 
            @dbus.service.method(_interface,
2354
 
                                 out_signature="a{oa{sv}}")
2355
 
            def GetAllClientsWithProperties(self):
2356
 
                "D-Bus method"
2357
 
                return dbus.Dictionary(
2358
 
                    ((c.dbus_object_path, c.GetAll(""))
2359
 
                     for c in tcp_server.clients.itervalues()),
2360
 
                    signature="oa{sv}")
2361
 
            
2362
 
            @dbus.service.method(_interface, in_signature="o")
2363
 
            def RemoveClient(self, object_path):
2364
 
                "D-Bus method"
2365
 
                for c in tcp_server.clients.itervalues():
2366
 
                    if c.dbus_object_path == object_path:
2367
 
                        del tcp_server.clients[c.name]
2368
 
                        c.remove_from_connection()
2369
 
                        # Don't signal anything except ClientRemoved
2370
 
                        c.disable(quiet=True)
2371
 
                        # Emit D-Bus signal
2372
 
                        self.ClientRemoved(object_path, c.name)
2373
 
                        return
2374
 
                raise KeyError(object_path)
2375
 
            
2376
 
            del _interface
2377
 
        
2378
 
        class MandosDBusServiceTransitional(MandosDBusService):
2379
 
            __metaclass__ = AlternateDBusNamesMetaclass
2380
 
        mandos_dbus_service = MandosDBusServiceTransitional()
2381
 
    
2382
 
    def cleanup():
2383
 
        "Cleanup function; run on exit"
2384
 
        service.cleanup()
2385
 
        
2386
 
        multiprocessing.active_children()
2387
 
        if not (tcp_server.clients or client_settings):
2388
 
            return
2389
 
        
2390
 
        # Store client before exiting. Secrets are encrypted with key
2391
 
        # based on what config file has. If config file is
2392
 
        # removed/edited, old secret will thus be unrecovable.
2393
 
        clients = {}
2394
 
        with PGPEngine() as pgp:
2395
 
            for client in tcp_server.clients.itervalues():
2396
 
                key = client_settings[client.name]["secret"]
2397
 
                client.encrypted_secret = pgp.encrypt(client.secret,
2398
 
                                                      key)
2399
 
                client_dict = {}
2400
 
                
2401
 
                # A list of attributes that can not be pickled
2402
 
                # + secret.
2403
 
                exclude = set(("bus", "changedstate", "secret",
2404
 
                               "checker"))
2405
 
                for name, typ in (inspect.getmembers
2406
 
                                  (dbus.service.Object)):
2407
 
                    exclude.add(name)
2408
 
                
2409
 
                client_dict["encrypted_secret"] = (client
2410
 
                                                   .encrypted_secret)
2411
 
                for attr in client.client_structure:
2412
 
                    if attr not in exclude:
2413
 
                        client_dict[attr] = getattr(client, attr)
2414
 
                
2415
 
                clients[client.name] = client_dict
2416
 
                del client_settings[client.name]["secret"]
2417
 
        
2418
 
        try:
2419
 
            tempfd, tempname = tempfile.mkstemp(suffix=".pickle",
2420
 
                                                prefix="clients-",
2421
 
                                                dir=os.path.dirname
2422
 
                                                (stored_state_path))
2423
 
            with os.fdopen(tempfd, "wb") as stored_state:
2424
 
                pickle.dump((clients, client_settings), stored_state)
2425
 
            os.rename(tempname, stored_state_path)
2426
 
        except (IOError, OSError) as e:
2427
 
            logger.warning("Could not save persistent state: {0}"
2428
 
                           .format(e))
2429
 
            if not debug:
2430
 
                try:
2431
 
                    os.remove(tempname)
2432
 
                except NameError:
2433
 
                    pass
2434
 
            if e.errno not in set((errno.ENOENT, errno.EACCES,
2435
 
                                   errno.EEXIST)):
2436
 
                raise e
2437
 
        
2438
 
        # Delete all clients, and settings from config
2439
 
        while tcp_server.clients:
2440
 
            name, client = tcp_server.clients.popitem()
2441
 
            if use_dbus:
2442
 
                client.remove_from_connection()
2443
 
            # Don't signal anything except ClientRemoved
2444
 
            client.disable(quiet=True)
2445
 
            if use_dbus:
2446
 
                # Emit D-Bus signal
2447
 
                mandos_dbus_service.ClientRemoved(client
2448
 
                                                  .dbus_object_path,
2449
 
                                                  client.name)
2450
 
        client_settings.clear()
2451
 
    
2452
 
    atexit.register(cleanup)
2453
 
    
2454
 
    for client in tcp_server.clients.itervalues():
2455
 
        if use_dbus:
2456
 
            # Emit D-Bus signal
2457
 
            mandos_dbus_service.ClientAdded(client.dbus_object_path)
2458
 
        # Need to initiate checking of clients
2459
 
        if client.enabled:
2460
 
            client.init_checker()
2461
 
    
2462
 
    tcp_server.enable()
2463
 
    tcp_server.server_activate()
2464
 
    
2465
 
    # Find out what port we got
2466
 
    service.port = tcp_server.socket.getsockname()[1]
2467
 
    if use_ipv6:
2468
 
        logger.info("Now listening on address %r, port %d,"
2469
 
                    " flowinfo %d, scope_id %d"
2470
 
                    % tcp_server.socket.getsockname())
2471
 
    else:                       # IPv4
2472
 
        logger.info("Now listening on address %r, port %d"
2473
 
                    % tcp_server.socket.getsockname())
2474
 
    
2475
 
    #service.interface = tcp_server.socket.getsockname()[3]
2476
 
    
 
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)
2477
634
    try:
2478
 
        # From the Avahi example code
2479
 
        try:
2480
 
            service.activate()
2481
 
        except dbus.exceptions.DBusException as error:
2482
 
            logger.critical("DBusException: %s", error)
2483
 
            cleanup()
2484
 
            sys.exit(1)
2485
 
        # End of Avahi example code
2486
 
        
2487
 
        gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2488
 
                             lambda *args, **kwargs:
2489
 
                             (tcp_server.handle_request
2490
 
                              (*args[2:], **kwargs) or True))
2491
 
        
2492
 
        logger.debug("Starting main loop")
2493
635
        main_loop.run()
2494
 
    except AvahiError as error:
2495
 
        logger.critical("AvahiError: %s", error)
2496
 
        cleanup()
2497
 
        sys.exit(1)
2498
636
    except KeyboardInterrupt:
2499
 
        if debug:
2500
 
            print("", file=sys.stderr)
2501
 
        logger.debug("Server received KeyboardInterrupt")
2502
 
    logger.debug("Server exiting")
2503
 
    # Must run before the D-Bus bus name gets deregistered
2504
 
    cleanup()
 
637
        print
 
638
    
 
639
    # Cleanup here
2505
640
 
2506
 
if __name__ == '__main__':
2507
 
    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()